Commit | Line | Data |
---|---|---|
059ec3d9 PH |
1 | /************************************************* |
2 | * Exim - an Internet mail transport agent * | |
3 | *************************************************/ | |
4 | ||
f9ba5e22 | 5 | /* Copyright (c) University of Cambridge 1995 - 2018 */ |
059ec3d9 PH |
6 | /* See the file NOTICE for conditions of use and distribution. */ |
7 | ||
17c76198 | 8 | /* Copyright (c) Phil Pennock 2012 */ |
059ec3d9 | 9 | |
17c76198 PP |
10 | /* This file provides TLS/SSL support for Exim using the GnuTLS library, |
11 | one of the available supported implementations. This file is #included into | |
12 | tls.c when USE_GNUTLS has been set. | |
059ec3d9 | 13 | |
17c76198 PP |
14 | The code herein is a revamp of GnuTLS integration using the current APIs; the |
15 | original tls-gnu.c was based on a patch which was contributed by Nikos | |
6aa6fc9c | 16 | Mavrogiannopoulos. The revamp is partially a rewrite, partially cut&paste as |
17c76198 | 17 | appropriate. |
059ec3d9 | 18 | |
17c76198 PP |
19 | APIs current as of GnuTLS 2.12.18; note that the GnuTLS manual is for GnuTLS 3, |
20 | which is not widely deployed by OS vendors. Will note issues below, which may | |
21 | assist in updating the code in the future. Another sources of hints is | |
22 | mod_gnutls for Apache (SNI callback registration and handling). | |
059ec3d9 | 23 | |
17c76198 PP |
24 | Keeping client and server variables more split than before and is currently |
25 | the norm, in anticipation of TLS in ACL callouts. | |
059ec3d9 | 26 | |
17c76198 PP |
27 | I wanted to switch to gnutls_certificate_set_verify_function() so that |
28 | certificate rejection could happen during handshake where it belongs, rather | |
29 | than being dropped afterwards, but that was introduced in 2.10.0 and Debian | |
30 | (6.0.5) is still on 2.8.6. So for now we have to stick with sub-par behaviour. | |
059ec3d9 | 31 | |
17c76198 PP |
32 | (I wasn't looking for libraries quite that old, when updating to get rid of |
33 | compiler warnings of deprecated APIs. If it turns out that a lot of the rest | |
34 | require current GnuTLS, then we'll drop support for the ancient libraries). | |
35 | */ | |
b5aea5e1 | 36 | |
17c76198 PP |
37 | #include <gnutls/gnutls.h> |
38 | /* needed for cert checks in verification and DN extraction: */ | |
39 | #include <gnutls/x509.h> | |
40 | /* man-page is incorrect, gnutls_rnd() is not in gnutls.h: */ | |
41 | #include <gnutls/crypto.h> | |
184384c3 | 42 | |
a5f239e4 PP |
43 | /* needed to disable PKCS11 autoload unless requested */ |
44 | #if GNUTLS_VERSION_NUMBER >= 0x020c00 | |
45 | # include <gnutls/pkcs11.h> | |
76075bb5 | 46 | # define SUPPORT_PARAM_TO_PK_BITS |
a5f239e4 | 47 | #endif |
7e07527a JH |
48 | #if GNUTLS_VERSION_NUMBER < 0x030103 && !defined(DISABLE_OCSP) |
49 | # warning "GnuTLS library version too old; define DISABLE_OCSP in Makefile" | |
50 | # define DISABLE_OCSP | |
51 | #endif | |
0cbf2b82 | 52 | #if GNUTLS_VERSION_NUMBER < 0x020a00 && !defined(DISABLE_EVENT) |
774ef2d7 | 53 | # warning "GnuTLS library version too old; tls:cert event unsupported" |
0cbf2b82 | 54 | # define DISABLE_EVENT |
a7538db1 | 55 | #endif |
c1cea16d JH |
56 | #if GNUTLS_VERSION_NUMBER >= 0x030000 |
57 | # define SUPPORT_SELFSIGN /* Uncertain what version is first usable but 2.12.23 is not */ | |
58 | #endif | |
a7fec7a7 JH |
59 | #if GNUTLS_VERSION_NUMBER >= 0x030306 |
60 | # define SUPPORT_CA_DIR | |
61 | #else | |
62 | # undef SUPPORT_CA_DIR | |
63 | #endif | |
11a04b5a | 64 | #if GNUTLS_VERSION_NUMBER >= 0x030014 |
cb1d7830 JH |
65 | # define SUPPORT_SYSDEFAULT_CABUNDLE |
66 | #endif | |
184384c3 JH |
67 | #if GNUTLS_VERSION_NUMBER >= 0x030104 |
68 | # define GNUTLS_CERT_VFY_STATUS_PRINT | |
69 | #endif | |
925ac8e4 JH |
70 | #if GNUTLS_VERSION_NUMBER >= 0x030109 |
71 | # define SUPPORT_CORK | |
72 | #endif | |
f20cfa4a JH |
73 | #if GNUTLS_VERSION_NUMBER >= 0x03010a |
74 | # define SUPPORT_GNUTLS_SESS_DESC | |
75 | #endif | |
4d2a62a3 JH |
76 | #if GNUTLS_VERSION_NUMBER >= 0x030300 |
77 | # define GNUTLS_AUTO_GLOBAL_INIT | |
9f707b89 | 78 | # define GNUTLS_AUTO_PKCS11_MANUAL |
4d2a62a3 | 79 | #endif |
97277c1f JH |
80 | #if (GNUTLS_VERSION_NUMBER >= 0x030404) \ |
81 | || (GNUTLS_VERSION_NUMBER >= 0x030311) && (GNUTLS_VERSION_NUMBER & 0xffff00 == 0x030300) | |
82 | # ifndef DISABLE_OCSP | |
83 | # define EXIM_HAVE_OCSP | |
84 | # endif | |
85 | #endif | |
f20cfa4a JH |
86 | #if GNUTLS_VERSION_NUMBER >= 0x030500 |
87 | # define SUPPORT_GNUTLS_KEYLOG | |
88 | #endif | |
47195144 JH |
89 | #if GNUTLS_VERSION_NUMBER >= 0x030506 && !defined(DISABLE_OCSP) |
90 | # define SUPPORT_SRV_OCSP_STACK | |
91 | #endif | |
49132a3b JH |
92 | #if GNUTLS_VERSION_NUMBER >= 0x030600 |
93 | # define GNUTLS_AUTO_DHPARAMS | |
94 | #endif | |
be427508 | 95 | #if GNUTLS_VERSION_NUMBER >= 0x030603 |
e326959e | 96 | # define EXIM_HAVE_TLS1_3 |
be427508 | 97 | # define SUPPORT_GNUTLS_EXT_RAW_PARSE |
e326959e | 98 | # define GNUTLS_OCSP_STATUS_REQUEST_GET2 |
be427508 | 99 | #endif |
c0635b6d JH |
100 | |
101 | #ifdef SUPPORT_DANE | |
102 | # if GNUTLS_VERSION_NUMBER >= 0x030000 | |
103 | # define DANESSL_USAGE_DANE_TA 2 | |
104 | # define DANESSL_USAGE_DANE_EE 3 | |
105 | # else | |
106 | # error GnuTLS version too early for DANE | |
107 | # endif | |
108 | # if GNUTLS_VERSION_NUMBER < 0x999999 | |
109 | # define GNUTLS_BROKEN_DANE_VALIDATION | |
110 | # endif | |
899b8bbc | 111 | #endif |
7e07527a | 112 | |
43e2db44 JH |
113 | #ifdef EXPERIMENTAL_TLS_RESUME |
114 | # if GNUTLS_VERSION_NUMBER < 0x030603 | |
115 | # error GNUTLS version too early for session-resumption | |
116 | # endif | |
117 | #endif | |
118 | ||
f2de3a33 | 119 | #ifndef DISABLE_OCSP |
2b4a568d JH |
120 | # include <gnutls/ocsp.h> |
121 | #endif | |
899b8bbc JH |
122 | #ifdef SUPPORT_DANE |
123 | # include <gnutls/dane.h> | |
124 | #endif | |
059ec3d9 | 125 | |
f1be21cf JH |
126 | #include "tls-cipher-stdname.c" |
127 | ||
128 | ||
b10c87b3 JH |
129 | #ifdef MACRO_PREDEF |
130 | void | |
131 | options_tls(void) | |
132 | { | |
133 | # ifdef EXPERIMENTAL_TLS_RESUME | |
134 | builtin_macro_create_var(US"_RESUME_DECODE", RESUME_DECODE_STRING ); | |
135 | # endif | |
e326959e JH |
136 | # ifdef EXIM_HAVE_TLS1_3 |
137 | builtin_macro_create(US"_HAVE_TLS1_3"); | |
138 | # endif | |
97277c1f JH |
139 | # ifdef EXIM_HAVE_OCSP |
140 | builtin_macro_create(US"_HAVE_TLS_OCSP"); | |
141 | # endif | |
142 | # ifdef SUPPORT_SRV_OCSP_STACK | |
143 | builtin_macro_create(US"_HAVE_TLS_OCSP_LIST"); | |
144 | # endif | |
b10c87b3 JH |
145 | } |
146 | #else | |
147 | ||
148 | ||
17c76198 | 149 | /* GnuTLS 2 vs 3 |
059ec3d9 | 150 | |
17c76198 PP |
151 | GnuTLS 3 only: |
152 | gnutls_global_set_audit_log_function() | |
059ec3d9 | 153 | |
17c76198 PP |
154 | Changes: |
155 | gnutls_certificate_verify_peers2(): is new, drop the 2 for old version | |
156 | */ | |
059ec3d9 | 157 | |
17c76198 | 158 | /* Local static variables for GnuTLS */ |
059ec3d9 | 159 | |
17c76198 | 160 | /* Values for verify_requirement */ |
059ec3d9 | 161 | |
e51c7be2 | 162 | enum peer_verify_requirement |
899b8bbc | 163 | { VERIFY_NONE, VERIFY_OPTIONAL, VERIFY_REQUIRED, VERIFY_DANE }; |
059ec3d9 | 164 | |
17c76198 PP |
165 | /* This holds most state for server or client; with this, we can set up an |
166 | outbound TLS-enabled connection in an ACL callout, while not stomping all | |
167 | over the TLS variables available for expansion. | |
059ec3d9 | 168 | |
17c76198 PP |
169 | Some of these correspond to variables in globals.c; those variables will |
170 | be set to point to content in one of these instances, as appropriate for | |
171 | the stage of the process lifetime. | |
059ec3d9 | 172 | |
b1a32a3c | 173 | Not handled here: global tlsp->tls_channelbinding. |
17c76198 | 174 | */ |
059ec3d9 | 175 | |
17c76198 | 176 | typedef struct exim_gnutls_state { |
9d1c15ef | 177 | gnutls_session_t session; |
17c76198 | 178 | gnutls_certificate_credentials_t x509_cred; |
9d1c15ef | 179 | gnutls_priority_t priority_cache; |
17c76198 | 180 | enum peer_verify_requirement verify_requirement; |
9d1c15ef JH |
181 | int fd_in; |
182 | int fd_out; | |
bd95ffc2 JH |
183 | |
184 | BOOL peer_cert_verified:1; | |
185 | BOOL peer_dane_verified:1; | |
186 | BOOL trigger_sni_changes:1; | |
187 | BOOL have_set_peerdn:1; | |
188 | BOOL xfer_eof:1; /*XXX never gets set! */ | |
189 | BOOL xfer_error:1; | |
190 | #ifdef SUPPORT_CORK | |
191 | BOOL corked:1; | |
192 | #endif | |
193 | ||
5fd28bb8 | 194 | const struct host_item *host; /* NULL if server */ |
afdb5e9c | 195 | gnutls_x509_crt_t peercert; |
9d1c15ef JH |
196 | uschar *peerdn; |
197 | uschar *ciphersuite; | |
198 | uschar *received_sni; | |
17c76198 PP |
199 | |
200 | const uschar *tls_certificate; | |
201 | const uschar *tls_privatekey; | |
202 | const uschar *tls_sni; /* client send only, not received */ | |
203 | const uschar *tls_verify_certificates; | |
204 | const uschar *tls_crl; | |
205 | const uschar *tls_require_ciphers; | |
e51c7be2 | 206 | |
17c76198 PP |
207 | uschar *exp_tls_certificate; |
208 | uschar *exp_tls_privatekey; | |
17c76198 PP |
209 | uschar *exp_tls_verify_certificates; |
210 | uschar *exp_tls_crl; | |
211 | uschar *exp_tls_require_ciphers; | |
55414b25 | 212 | const uschar *exp_tls_verify_cert_hostnames; |
0cbf2b82 | 213 | #ifndef DISABLE_EVENT |
a7538db1 JH |
214 | uschar *event_action; |
215 | #endif | |
899b8bbc JH |
216 | #ifdef SUPPORT_DANE |
217 | char * const * dane_data; | |
218 | const int * dane_data_len; | |
219 | #endif | |
17c76198 | 220 | |
389ca47a | 221 | tls_support *tlsp; /* set in tls_init() */ |
817d9f57 | 222 | |
17c76198 PP |
223 | uschar *xfer_buffer; |
224 | int xfer_buffer_lwm; | |
225 | int xfer_buffer_hwm; | |
17c76198 PP |
226 | } exim_gnutls_state_st; |
227 | ||
228 | static const exim_gnutls_state_st exim_gnutls_state_init = { | |
b10c87b3 | 229 | /* all elements not explicitly intialised here get 0/NULL/FALSE */ |
f2ed27cf JH |
230 | .fd_in = -1, |
231 | .fd_out = -1, | |
17c76198 | 232 | }; |
83da1223 | 233 | |
17c76198 PP |
234 | /* Not only do we have our own APIs which don't pass around state, assuming |
235 | it's held in globals, GnuTLS doesn't appear to let us register callback data | |
236 | for callbacks, or as part of the session, so we have to keep a "this is the | |
237 | context we're currently dealing with" pointer and rely upon being | |
238 | single-threaded to keep from processing data on an inbound TLS connection while | |
239 | talking to another TLS connection for an outbound check. This does mean that | |
240 | there's no way for heart-beats to be responded to, for the duration of the | |
a7538db1 JH |
241 | second connection. |
242 | XXX But see gnutls_session_get_ptr() | |
243 | */ | |
059ec3d9 | 244 | |
74f1a423 | 245 | static exim_gnutls_state_st state_server; |
059ec3d9 | 246 | |
49132a3b | 247 | #ifndef GNUTLS_AUTO_DHPARAMS |
17c76198 PP |
248 | /* dh_params are initialised once within the lifetime of a process using TLS; |
249 | if we used TLS in a long-lived daemon, we'd have to reconsider this. But we | |
250 | don't want to repeat this. */ | |
83da1223 | 251 | |
17c76198 | 252 | static gnutls_dh_params_t dh_server_params = NULL; |
49132a3b | 253 | #endif |
059ec3d9 | 254 | |
dea4b568 | 255 | static int ssl_session_timeout = 7200; /* Two hours */ |
059ec3d9 | 256 | |
fc243e94 | 257 | static const uschar * const exim_default_gnutls_priority = US"NORMAL"; |
83da1223 | 258 | |
17c76198 | 259 | /* Guard library core initialisation */ |
83da1223 | 260 | |
17c76198 | 261 | static BOOL exim_gnutls_base_init_done = FALSE; |
059ec3d9 | 262 | |
4fb7df6d | 263 | #ifndef DISABLE_OCSP |
9196d5bf | 264 | static BOOL gnutls_buggy_ocsp = FALSE; |
e5489333 | 265 | static BOOL exim_testharness_disable_ocsp_validity_check = FALSE; |
4fb7df6d | 266 | #endif |
9196d5bf | 267 | |
b10c87b3 JH |
268 | #ifdef EXPERIMENTAL_TLS_RESUME |
269 | static gnutls_datum_t server_sessticket_key; | |
270 | #endif | |
059ec3d9 | 271 | |
17c76198 PP |
272 | /* ------------------------------------------------------------------------ */ |
273 | /* macros */ | |
83da1223 | 274 | |
17c76198 | 275 | #define MAX_HOST_LEN 255 |
83da1223 | 276 | |
17c76198 PP |
277 | /* Set this to control gnutls_global_set_log_level(); values 0 to 9 will setup |
278 | the library logging; a value less than 0 disables the calls to set up logging | |
dc6d1769 JH |
279 | callbacks. GNuTLS also looks for an environment variable - except not for |
280 | setuid binaries, making it useless - "GNUTLS_DEBUG_LEVEL". | |
281 | Allegedly the testscript line "GNUTLS_DEBUG_LEVEL=9 sudo exim ..." would work, | |
282 | but the env var must be added to /etc/sudoers too. */ | |
2c17bb02 | 283 | #ifndef EXIM_GNUTLS_LIBRARY_LOG_LEVEL |
b1a4f234 | 284 | # define EXIM_GNUTLS_LIBRARY_LOG_LEVEL -1 |
2c17bb02 | 285 | #endif |
83da1223 | 286 | |
2c17bb02 | 287 | #ifndef EXIM_CLIENT_DH_MIN_BITS |
a7538db1 | 288 | # define EXIM_CLIENT_DH_MIN_BITS 1024 |
2c17bb02 | 289 | #endif |
83da1223 | 290 | |
af3498d6 PP |
291 | /* With GnuTLS 2.12.x+ we have gnutls_sec_param_to_pk_bits() with which we |
292 | can ask for a bit-strength. Without that, we stick to the constant we had | |
293 | before, for now. */ | |
2c17bb02 | 294 | #ifndef EXIM_SERVER_DH_BITS_PRE2_12 |
a7538db1 | 295 | # define EXIM_SERVER_DH_BITS_PRE2_12 1024 |
2c17bb02 | 296 | #endif |
af3498d6 | 297 | |
cf0c6164 JH |
298 | #define expand_check_tlsvar(Varname, errstr) \ |
299 | expand_check(state->Varname, US #Varname, &state->exp_##Varname, errstr) | |
83da1223 | 300 | |
17c76198 | 301 | #if GNUTLS_VERSION_NUMBER >= 0x020c00 |
e51c7be2 JH |
302 | # define HAVE_GNUTLS_SESSION_CHANNEL_BINDING |
303 | # define HAVE_GNUTLS_SEC_PARAM_CONSTANTS | |
304 | # define HAVE_GNUTLS_RND | |
2519e60d TL |
305 | /* The security fix we provide with the gnutls_allow_auto_pkcs11 option |
306 | * (4.82 PP/09) introduces a compatibility regression. The symbol simply | |
307 | * isn't available sometimes, so this needs to become a conditional | |
308 | * compilation; the sanest way to deal with this being a problem on | |
309 | * older OSes is to block it in the Local/Makefile with this compiler | |
310 | * definition */ | |
e51c7be2 JH |
311 | # ifndef AVOID_GNUTLS_PKCS11 |
312 | # define HAVE_GNUTLS_PKCS11 | |
313 | # endif /* AVOID_GNUTLS_PKCS11 */ | |
17c76198 | 314 | #endif |
83da1223 | 315 | |
af3498d6 PP |
316 | |
317 | ||
318 | ||
319 | /* ------------------------------------------------------------------------ */ | |
320 | /* Callback declarations */ | |
321 | ||
322 | #if EXIM_GNUTLS_LIBRARY_LOG_LEVEL >= 0 | |
323 | static void exim_gnutls_logger_cb(int level, const char *message); | |
324 | #endif | |
325 | ||
326 | static int exim_sni_handling_cb(gnutls_session_t session); | |
327 | ||
e5489333 JH |
328 | #ifdef EXPERIMENTAL_TLS_RESUME |
329 | static int | |
330 | tls_server_ticket_cb(gnutls_session_t sess, u_int htype, unsigned when, | |
331 | unsigned incoming, const gnutls_datum_t * msg); | |
332 | #endif | |
af3498d6 PP |
333 | |
334 | ||
b10c87b3 JH |
335 | /* Daemon one-time initialisation */ |
336 | void | |
337 | tls_daemon_init(void) | |
338 | { | |
339 | #ifdef EXPERIMENTAL_TLS_RESUME | |
340 | /* We are dependent on the GnuTLS implementation of the Session Ticket | |
341 | encryption; both the strength and the key rotation period. We hope that | |
342 | the strength at least matches that of the ciphersuite (but GnuTLS does not | |
343 | document this). */ | |
344 | ||
345 | static BOOL once = FALSE; | |
346 | if (once) return; | |
347 | once = TRUE; | |
348 | gnutls_session_ticket_key_generate(&server_sessticket_key); /* >= 2.10.0 */ | |
349 | if (f.running_in_test_harness) ssl_session_timeout = 6; | |
350 | #endif | |
351 | } | |
352 | ||
17c76198 PP |
353 | /* ------------------------------------------------------------------------ */ |
354 | /* Static functions */ | |
059ec3d9 PH |
355 | |
356 | /************************************************* | |
357 | * Handle TLS error * | |
358 | *************************************************/ | |
359 | ||
360 | /* Called from lots of places when errors occur before actually starting to do | |
361 | the TLS handshake, that is, while the session is still in clear. Always returns | |
362 | DEFER for a server and FAIL for a client so that most calls can use "return | |
363 | tls_error(...)" to do this processing and then give an appropriate return. A | |
364 | single function is used for both server and client, because it is called from | |
365 | some shared functions. | |
366 | ||
367 | Argument: | |
368 | prefix text to include in the logged error | |
7199e1ee TF |
369 | msg additional error string (may be NULL) |
370 | usually obtained from gnutls_strerror() | |
17c76198 PP |
371 | host NULL if setting up a server; |
372 | the connected host if setting up a client | |
cf0c6164 | 373 | errstr pointer to returned error string |
059ec3d9 PH |
374 | |
375 | Returns: OK/DEFER/FAIL | |
376 | */ | |
377 | ||
378 | static int | |
48224640 | 379 | tls_error(const uschar *prefix, const uschar *msg, const host_item *host, |
cf0c6164 | 380 | uschar ** errstr) |
059ec3d9 | 381 | { |
cf0c6164 | 382 | if (errstr) |
48224640 | 383 | *errstr = string_sprintf("(%s)%s%s", prefix, msg ? ": " : "", msg ? msg : US""); |
cf0c6164 | 384 | return host ? FAIL : DEFER; |
059ec3d9 PH |
385 | } |
386 | ||
387 | ||
452a164f JH |
388 | static int |
389 | tls_error_gnu(const uschar *prefix, int err, const host_item *host, | |
390 | uschar ** errstr) | |
391 | { | |
392 | return tls_error(prefix, US gnutls_strerror(err), host, errstr); | |
393 | } | |
394 | ||
395 | static int | |
396 | tls_error_sys(const uschar *prefix, int err, const host_item *host, | |
397 | uschar ** errstr) | |
398 | { | |
399 | return tls_error(prefix, US strerror(err), host, errstr); | |
400 | } | |
059ec3d9 | 401 | |
17c76198 | 402 | |
059ec3d9 | 403 | /************************************************* |
17c76198 | 404 | * Deal with logging errors during I/O * |
059ec3d9 PH |
405 | *************************************************/ |
406 | ||
17c76198 | 407 | /* We have to get the identity of the peer from saved data. |
059ec3d9 | 408 | |
17c76198 PP |
409 | Argument: |
410 | state the current GnuTLS exim state container | |
411 | rc the GnuTLS error code, or 0 if it's a local error | |
412 | when text identifying read or write | |
95f52235 | 413 | text local error text when rc is 0 |
059ec3d9 | 414 | |
17c76198 | 415 | Returns: nothing |
059ec3d9 PH |
416 | */ |
417 | ||
17c76198 PP |
418 | static void |
419 | record_io_error(exim_gnutls_state_st *state, int rc, uschar *when, uschar *text) | |
059ec3d9 | 420 | { |
48224640 | 421 | const uschar * msg; |
cf0c6164 | 422 | uschar * errstr; |
059ec3d9 | 423 | |
17c76198 | 424 | if (rc == GNUTLS_E_FATAL_ALERT_RECEIVED) |
95f52235 | 425 | msg = string_sprintf("A TLS fatal alert has been received: %s", |
17c76198 PP |
426 | US gnutls_alert_get_name(gnutls_alert_get(state->session))); |
427 | else | |
48224640 | 428 | msg = US gnutls_strerror(rc); |
059ec3d9 | 429 | |
cf0c6164 JH |
430 | (void) tls_error(when, msg, state->host, &errstr); |
431 | ||
432 | if (state->host) | |
433 | log_write(0, LOG_MAIN, "H=%s [%s] TLS error on connection %s", | |
434 | state->host->name, state->host->address, errstr); | |
435 | else | |
436 | { | |
437 | uschar * conn_info = smtp_get_connection_info(); | |
438 | if (Ustrncmp(conn_info, US"SMTP ", 5) == 0) conn_info += 5; | |
439 | /* I'd like to get separated H= here, but too hard for now */ | |
440 | log_write(0, LOG_MAIN, "TLS error on %s %s", conn_info, errstr); | |
441 | } | |
17c76198 | 442 | } |
059ec3d9 | 443 | |
059ec3d9 | 444 | |
059ec3d9 | 445 | |
059ec3d9 | 446 | |
17c76198 PP |
447 | /************************************************* |
448 | * Set various Exim expansion vars * | |
449 | *************************************************/ | |
059ec3d9 | 450 | |
e51c7be2 JH |
451 | #define exim_gnutls_cert_err(Label) \ |
452 | do \ | |
453 | { \ | |
454 | if (rc != GNUTLS_E_SUCCESS) \ | |
455 | { \ | |
456 | DEBUG(D_tls) debug_printf("TLS: cert problem: %s: %s\n", \ | |
457 | (Label), gnutls_strerror(rc)); \ | |
458 | return rc; \ | |
459 | } \ | |
460 | } while (0) | |
9d1c15ef JH |
461 | |
462 | static int | |
27f19eb4 | 463 | import_cert(const gnutls_datum_t * cert, gnutls_x509_crt_t * crtp) |
9d1c15ef JH |
464 | { |
465 | int rc; | |
466 | ||
467 | rc = gnutls_x509_crt_init(crtp); | |
468 | exim_gnutls_cert_err(US"gnutls_x509_crt_init (crt)"); | |
469 | ||
470 | rc = gnutls_x509_crt_import(*crtp, cert, GNUTLS_X509_FMT_DER); | |
471 | exim_gnutls_cert_err(US"failed to import certificate [gnutls_x509_crt_import(cert)]"); | |
472 | ||
473 | return rc; | |
474 | } | |
475 | ||
476 | #undef exim_gnutls_cert_err | |
477 | ||
478 | ||
17c76198 PP |
479 | /* We set various Exim global variables from the state, once a session has |
480 | been established. With TLS callouts, may need to change this to stack | |
481 | variables, or just re-call it with the server state after client callout | |
482 | has finished. | |
059ec3d9 | 483 | |
9d1c15ef | 484 | Make sure anything set here is unset in tls_getc(). |
17c76198 PP |
485 | |
486 | Sets: | |
487 | tls_active fd | |
488 | tls_bits strength indicator | |
489 | tls_certificate_verified bool indicator | |
b1a32a3c | 490 | tls_channelbinding for some SASL mechanisms |
da40b1ec | 491 | tls_ver a string |
17c76198 | 492 | tls_cipher a string |
9d1c15ef | 493 | tls_peercert pointer to library internal |
17c76198 PP |
494 | tls_peerdn a string |
495 | tls_sni a (UTF-8) string | |
9d1c15ef | 496 | tls_ourcert pointer to library internal |
17c76198 PP |
497 | |
498 | Argument: | |
499 | state the relevant exim_gnutls_state_st * | |
500 | */ | |
501 | ||
502 | static void | |
9d1c15ef | 503 | extract_exim_vars_from_tls_state(exim_gnutls_state_st * state) |
17c76198 | 504 | { |
17c76198 PP |
505 | #ifdef HAVE_GNUTLS_SESSION_CHANNEL_BINDING |
506 | int old_pool; | |
507 | int rc; | |
508 | gnutls_datum_t channel; | |
509 | #endif | |
9d1c15ef | 510 | tls_support * tlsp = state->tlsp; |
17c76198 | 511 | |
74f1a423 JH |
512 | tlsp->active.sock = state->fd_out; |
513 | tlsp->active.tls_ctx = state; | |
17c76198 | 514 | |
817d9f57 | 515 | DEBUG(D_tls) debug_printf("cipher: %s\n", state->ciphersuite); |
17c76198 | 516 | |
9d1c15ef | 517 | tlsp->certificate_verified = state->peer_cert_verified; |
899b8bbc JH |
518 | #ifdef SUPPORT_DANE |
519 | tlsp->dane_verified = state->peer_dane_verified; | |
520 | #endif | |
059ec3d9 | 521 | |
b1a32a3c | 522 | /* note that tls_channelbinding is not saved to the spool file, since it's |
17c76198 PP |
523 | only available for use for authenticators while this TLS session is running. */ |
524 | ||
b1a32a3c | 525 | tlsp->channelbinding = NULL; |
17c76198 PP |
526 | #ifdef HAVE_GNUTLS_SESSION_CHANNEL_BINDING |
527 | channel.data = NULL; | |
528 | channel.size = 0; | |
1f20760b JH |
529 | if ((rc = gnutls_session_channel_binding(state->session, GNUTLS_CB_TLS_UNIQUE, &channel))) |
530 | { DEBUG(D_tls) debug_printf("Channel binding error: %s\n", gnutls_strerror(rc)); } | |
531 | else | |
532 | { | |
b1a32a3c JH |
533 | /* Declare the taintedness of the binding info. On server, untainted; on |
534 | client, tainted - being the Finish msg from the server. */ | |
535 | ||
17c76198 PP |
536 | old_pool = store_pool; |
537 | store_pool = POOL_PERM; | |
b1a32a3c JH |
538 | tlsp->channelbinding = b64encode_taint(CUS channel.data, (int)channel.size, |
539 | !!state->host); | |
17c76198 | 540 | store_pool = old_pool; |
b1a32a3c | 541 | DEBUG(D_tls) debug_printf("Have channel bindings cached for possible auth usage\n"); |
1f20760b | 542 | } |
17c76198 PP |
543 | #endif |
544 | ||
9d1c15ef JH |
545 | /* peercert is set in peer_status() */ |
546 | tlsp->peerdn = state->peerdn; | |
547 | tlsp->sni = state->received_sni; | |
548 | ||
549 | /* record our certificate */ | |
550 | { | |
27f19eb4 | 551 | const gnutls_datum_t * cert = gnutls_certificate_get_ours(state->session); |
9d1c15ef JH |
552 | gnutls_x509_crt_t crt; |
553 | ||
554 | tlsp->ourcert = cert && import_cert(cert, &crt)==0 ? crt : NULL; | |
555 | } | |
059ec3d9 PH |
556 | } |
557 | ||
558 | ||
559 | ||
17c76198 | 560 | |
49132a3b | 561 | #ifndef GNUTLS_AUTO_DHPARAMS |
059ec3d9 | 562 | /************************************************* |
575643cd | 563 | * Setup up DH parameters * |
059ec3d9 PH |
564 | *************************************************/ |
565 | ||
575643cd | 566 | /* Generating the D-H parameters may take a long time. They only need to |
059ec3d9 PH |
567 | be re-generated every so often, depending on security policy. What we do is to |
568 | keep these parameters in a file in the spool directory. If the file does not | |
569 | exist, we generate them. This means that it is easy to cause a regeneration. | |
570 | ||
571 | The new file is written as a temporary file and renamed, so that an incomplete | |
572 | file is never present. If two processes both compute some new parameters, you | |
573 | waste a bit of effort, but it doesn't seem worth messing around with locking to | |
574 | prevent this. | |
575 | ||
059ec3d9 PH |
576 | Returns: OK/DEFER/FAIL |
577 | */ | |
578 | ||
579 | static int | |
cf0c6164 | 580 | init_server_dh(uschar ** errstr) |
059ec3d9 | 581 | { |
17c76198 PP |
582 | int fd, rc; |
583 | unsigned int dh_bits; | |
49132a3b | 584 | gnutls_datum_t m = {.data = NULL, .size = 0}; |
a799883d PP |
585 | uschar filename_buf[PATH_MAX]; |
586 | uschar *filename = NULL; | |
17c76198 | 587 | size_t sz; |
a799883d PP |
588 | uschar *exp_tls_dhparam; |
589 | BOOL use_file_in_spool = FALSE; | |
17c76198 | 590 | host_item *host = NULL; /* dummy for macros */ |
059ec3d9 | 591 | |
17c76198 | 592 | DEBUG(D_tls) debug_printf("Initialising GnuTLS server params.\n"); |
059ec3d9 | 593 | |
452a164f JH |
594 | if ((rc = gnutls_dh_params_init(&dh_server_params))) |
595 | return tls_error_gnu(US"gnutls_dh_params_init", rc, host, errstr); | |
059ec3d9 | 596 | |
cf0c6164 | 597 | if (!expand_check(tls_dhparam, US"tls_dhparam", &exp_tls_dhparam, errstr)) |
a799883d PP |
598 | return DEFER; |
599 | ||
600 | if (!exp_tls_dhparam) | |
601 | { | |
602 | DEBUG(D_tls) debug_printf("Loading default hard-coded DH params\n"); | |
603 | m.data = US std_dh_prime_default(); | |
604 | m.size = Ustrlen(m.data); | |
605 | } | |
606 | else if (Ustrcmp(exp_tls_dhparam, "historic") == 0) | |
607 | use_file_in_spool = TRUE; | |
608 | else if (Ustrcmp(exp_tls_dhparam, "none") == 0) | |
609 | { | |
610 | DEBUG(D_tls) debug_printf("Requested no DH parameters.\n"); | |
611 | return OK; | |
612 | } | |
613 | else if (exp_tls_dhparam[0] != '/') | |
614 | { | |
f5d25c2b | 615 | if (!(m.data = US std_dh_prime_named(exp_tls_dhparam))) |
48224640 | 616 | return tls_error(US"No standard prime named", exp_tls_dhparam, NULL, errstr); |
a799883d PP |
617 | m.size = Ustrlen(m.data); |
618 | } | |
619 | else | |
a799883d | 620 | filename = exp_tls_dhparam; |
a799883d PP |
621 | |
622 | if (m.data) | |
623 | { | |
452a164f JH |
624 | if ((rc = gnutls_dh_params_import_pkcs3(dh_server_params, &m, GNUTLS_X509_FMT_PEM))) |
625 | return tls_error_gnu(US"gnutls_dh_params_import_pkcs3", rc, host, errstr); | |
a799883d PP |
626 | DEBUG(D_tls) debug_printf("Loaded fixed standard D-H parameters\n"); |
627 | return OK; | |
628 | } | |
629 | ||
af3498d6 PP |
630 | #ifdef HAVE_GNUTLS_SEC_PARAM_CONSTANTS |
631 | /* If you change this constant, also change dh_param_fn_ext so that we can use a | |
17c76198 | 632 | different filename and ensure we have sufficient bits. */ |
452a164f JH |
633 | |
634 | if (!(dh_bits = gnutls_sec_param_to_pk_bits(GNUTLS_PK_DH, GNUTLS_SEC_PARAM_NORMAL))) | |
cf0c6164 | 635 | return tls_error(US"gnutls_sec_param_to_pk_bits() failed", NULL, NULL, errstr); |
af3498d6 | 636 | DEBUG(D_tls) |
b34fc30c | 637 | debug_printf("GnuTLS tells us that for D-H PK, NORMAL is %d bits.\n", |
af3498d6 PP |
638 | dh_bits); |
639 | #else | |
640 | dh_bits = EXIM_SERVER_DH_BITS_PRE2_12; | |
641 | DEBUG(D_tls) | |
642 | debug_printf("GnuTLS lacks gnutls_sec_param_to_pk_bits(), using %d bits.\n", | |
643 | dh_bits); | |
644 | #endif | |
059ec3d9 | 645 | |
3375e053 PP |
646 | /* Some clients have hard-coded limits. */ |
647 | if (dh_bits > tls_dh_max_bits) | |
648 | { | |
649 | DEBUG(D_tls) | |
650 | debug_printf("tls_dh_max_bits clamping override, using %d bits instead.\n", | |
651 | tls_dh_max_bits); | |
652 | dh_bits = tls_dh_max_bits; | |
653 | } | |
654 | ||
a799883d PP |
655 | if (use_file_in_spool) |
656 | { | |
657 | if (!string_format(filename_buf, sizeof(filename_buf), | |
658 | "%s/gnutls-params-%d", spool_directory, dh_bits)) | |
cf0c6164 | 659 | return tls_error(US"overlong filename", NULL, NULL, errstr); |
a799883d PP |
660 | filename = filename_buf; |
661 | } | |
059ec3d9 | 662 | |
b5aea5e1 | 663 | /* Open the cache file for reading and if successful, read it and set up the |
575643cd | 664 | parameters. */ |
059ec3d9 | 665 | |
f5d25c2b | 666 | if ((fd = Uopen(filename, O_RDONLY, 0)) >= 0) |
059ec3d9 | 667 | { |
b5aea5e1 | 668 | struct stat statbuf; |
17c76198 PP |
669 | FILE *fp; |
670 | int saved_errno; | |
671 | ||
672 | if (fstat(fd, &statbuf) < 0) /* EIO */ | |
673 | { | |
674 | saved_errno = errno; | |
675 | (void)close(fd); | |
452a164f | 676 | return tls_error_sys(US"TLS cache stat failed", saved_errno, NULL, errstr); |
17c76198 PP |
677 | } |
678 | if (!S_ISREG(statbuf.st_mode)) | |
b5aea5e1 PH |
679 | { |
680 | (void)close(fd); | |
cf0c6164 | 681 | return tls_error(US"TLS cache not a file", NULL, NULL, errstr); |
17c76198 | 682 | } |
40c90bca | 683 | if (!(fp = fdopen(fd, "rb"))) |
17c76198 PP |
684 | { |
685 | saved_errno = errno; | |
686 | (void)close(fd); | |
452a164f JH |
687 | return tls_error_sys(US"fdopen(TLS cache stat fd) failed", |
688 | saved_errno, NULL, errstr); | |
b5aea5e1 | 689 | } |
059ec3d9 | 690 | |
b5aea5e1 | 691 | m.size = statbuf.st_size; |
f3ebb786 | 692 | if (!(m.data = store_malloc(m.size))) |
17c76198 PP |
693 | { |
694 | fclose(fp); | |
452a164f | 695 | return tls_error_sys(US"malloc failed", errno, NULL, errstr); |
17c76198 | 696 | } |
40c90bca | 697 | if (!(sz = fread(m.data, m.size, 1, fp))) |
17c76198 PP |
698 | { |
699 | saved_errno = errno; | |
700 | fclose(fp); | |
f3ebb786 | 701 | store_free(m.data); |
452a164f | 702 | return tls_error_sys(US"fread failed", saved_errno, NULL, errstr); |
17c76198 PP |
703 | } |
704 | fclose(fp); | |
b5aea5e1 | 705 | |
17c76198 | 706 | rc = gnutls_dh_params_import_pkcs3(dh_server_params, &m, GNUTLS_X509_FMT_PEM); |
f3ebb786 | 707 | store_free(m.data); |
452a164f JH |
708 | if (rc) |
709 | return tls_error_gnu(US"gnutls_dh_params_import_pkcs3", rc, host, errstr); | |
17c76198 | 710 | DEBUG(D_tls) debug_printf("read D-H parameters from file \"%s\"\n", filename); |
b5aea5e1 PH |
711 | } |
712 | ||
713 | /* If the file does not exist, fall through to compute new data and cache it. | |
714 | If there was any other opening error, it is serious. */ | |
715 | ||
182ad5cf PH |
716 | else if (errno == ENOENT) |
717 | { | |
17c76198 | 718 | rc = -1; |
182ad5cf | 719 | DEBUG(D_tls) |
17c76198 | 720 | debug_printf("D-H parameter cache file \"%s\" does not exist\n", filename); |
182ad5cf PH |
721 | } |
722 | else | |
17c76198 | 723 | return tls_error(string_open_failed(errno, "\"%s\" for reading", filename), |
cf0c6164 | 724 | NULL, NULL, errstr); |
b5aea5e1 PH |
725 | |
726 | /* If ret < 0, either the cache file does not exist, or the data it contains | |
727 | is not useful. One particular case of this is when upgrading from an older | |
728 | release of Exim in which the data was stored in a different format. We don't | |
729 | try to be clever and support both formats; we just regenerate new data in this | |
730 | case. */ | |
731 | ||
17c76198 | 732 | if (rc < 0) |
b5aea5e1 | 733 | { |
17c76198 | 734 | uschar *temp_fn; |
201f5254 | 735 | unsigned int dh_bits_gen = dh_bits; |
059ec3d9 | 736 | |
17c76198 PP |
737 | if ((PATH_MAX - Ustrlen(filename)) < 10) |
738 | return tls_error(US"Filename too long to generate replacement", | |
48224640 | 739 | filename, NULL, errstr); |
059ec3d9 | 740 | |
48224640 | 741 | temp_fn = string_copy(US"%s.XXXXXXX"); |
f5d25c2b | 742 | if ((fd = mkstemp(CS temp_fn)) < 0) /* modifies temp_fn */ |
452a164f | 743 | return tls_error_sys(US"Unable to open temp file", errno, NULL, errstr); |
b66fecb4 | 744 | (void)exim_chown(temp_fn, exim_uid, exim_gid); /* Probably not necessary */ |
059ec3d9 | 745 | |
49132a3b JH |
746 | /* GnuTLS overshoots! If we ask for 2236, we might get 2237 or more. But |
747 | there's no way to ask GnuTLS how many bits there really are. We can ask | |
748 | how many bits were used in a TLS session, but that's it! The prime itself | |
749 | is hidden behind too much abstraction. So we ask for less, and proceed on | |
750 | a wing and a prayer. First attempt, subtracted 3 for 2233 and got 2240. */ | |
751 | ||
cae6e576 | 752 | if (dh_bits >= EXIM_CLIENT_DH_MIN_BITS + 10) |
201f5254 PP |
753 | { |
754 | dh_bits_gen = dh_bits - 10; | |
755 | DEBUG(D_tls) | |
756 | debug_printf("being paranoid about DH generation, make it '%d' bits'\n", | |
757 | dh_bits_gen); | |
758 | } | |
759 | ||
760 | DEBUG(D_tls) | |
761 | debug_printf("requesting generation of %d bit Diffie-Hellman prime ...\n", | |
762 | dh_bits_gen); | |
452a164f JH |
763 | if ((rc = gnutls_dh_params_generate2(dh_server_params, dh_bits_gen))) |
764 | return tls_error_gnu(US"gnutls_dh_params_generate2", rc, host, errstr); | |
17c76198 PP |
765 | |
766 | /* gnutls_dh_params_export_pkcs3() will tell us the exact size, every time, | |
767 | and I confirmed that a NULL call to get the size first is how the GnuTLS | |
768 | sample apps handle this. */ | |
769 | ||
770 | sz = 0; | |
771 | m.data = NULL; | |
452a164f JH |
772 | if ( (rc = gnutls_dh_params_export_pkcs3(dh_server_params, |
773 | GNUTLS_X509_FMT_PEM, m.data, &sz)) | |
774 | && rc != GNUTLS_E_SHORT_MEMORY_BUFFER) | |
775 | return tls_error_gnu(US"gnutls_dh_params_export_pkcs3(NULL) sizing", | |
776 | rc, host, errstr); | |
17c76198 | 777 | m.size = sz; |
f3ebb786 | 778 | if (!(m.data = store_malloc(m.size))) |
452a164f | 779 | return tls_error_sys(US"memory allocation failed", errno, NULL, errstr); |
40c90bca | 780 | |
1f00591e | 781 | /* this will return a size 1 less than the allocation size above */ |
452a164f JH |
782 | if ((rc = gnutls_dh_params_export_pkcs3(dh_server_params, GNUTLS_X509_FMT_PEM, |
783 | m.data, &sz))) | |
17c76198 | 784 | { |
f3ebb786 | 785 | store_free(m.data); |
452a164f | 786 | return tls_error_gnu(US"gnutls_dh_params_export_pkcs3() real", rc, host, errstr); |
17c76198 | 787 | } |
1f00591e | 788 | m.size = sz; /* shrink by 1, probably */ |
059ec3d9 | 789 | |
f5d25c2b | 790 | if ((sz = write_to_fd_buf(fd, m.data, (size_t) m.size)) != m.size) |
17c76198 | 791 | { |
f3ebb786 | 792 | store_free(m.data); |
452a164f JH |
793 | return tls_error_sys(US"TLS cache write D-H params failed", |
794 | errno, NULL, errstr); | |
17c76198 | 795 | } |
f3ebb786 | 796 | store_free(m.data); |
f5d25c2b | 797 | if ((sz = write_to_fd_buf(fd, US"\n", 1)) != 1) |
452a164f JH |
798 | return tls_error_sys(US"TLS cache write D-H params final newline failed", |
799 | errno, NULL, errstr); | |
17c76198 | 800 | |
f5d25c2b | 801 | if ((rc = close(fd))) |
452a164f | 802 | return tls_error_sys(US"TLS cache write close() failed", errno, NULL, errstr); |
059ec3d9 | 803 | |
17c76198 | 804 | if (Urename(temp_fn, filename) < 0) |
452a164f JH |
805 | return tls_error_sys(string_sprintf("failed to rename \"%s\" as \"%s\"", |
806 | temp_fn, filename), errno, NULL, errstr); | |
059ec3d9 | 807 | |
17c76198 | 808 | DEBUG(D_tls) debug_printf("wrote D-H parameters to file \"%s\"\n", filename); |
059ec3d9 PH |
809 | } |
810 | ||
17c76198 | 811 | DEBUG(D_tls) debug_printf("initialized server D-H parameters\n"); |
059ec3d9 PH |
812 | return OK; |
813 | } | |
49132a3b | 814 | #endif |
059ec3d9 PH |
815 | |
816 | ||
817 | ||
818 | ||
23bb6982 JH |
819 | /* Create and install a selfsigned certificate, for use in server mode */ |
820 | ||
821 | static int | |
cf0c6164 | 822 | tls_install_selfsign(exim_gnutls_state_st * state, uschar ** errstr) |
23bb6982 JH |
823 | { |
824 | gnutls_x509_crt_t cert = NULL; | |
825 | time_t now; | |
826 | gnutls_x509_privkey_t pkey = NULL; | |
827 | const uschar * where; | |
828 | int rc; | |
829 | ||
c1cea16d JH |
830 | #ifndef SUPPORT_SELFSIGN |
831 | where = US"library too old"; | |
832 | rc = GNUTLS_E_NO_CERTIFICATE_FOUND; | |
833 | if (TRUE) goto err; | |
834 | #endif | |
835 | ||
23bb6982 JH |
836 | where = US"initialising pkey"; |
837 | if ((rc = gnutls_x509_privkey_init(&pkey))) goto err; | |
838 | ||
839 | where = US"initialising cert"; | |
840 | if ((rc = gnutls_x509_crt_init(&cert))) goto err; | |
841 | ||
c1cea16d | 842 | where = US"generating pkey"; /* Hangs on 2.12.23 */ |
23bb6982 | 843 | if ((rc = gnutls_x509_privkey_generate(pkey, GNUTLS_PK_RSA, |
76075bb5 | 844 | #ifdef SUPPORT_PARAM_TO_PK_BITS |
4312da48 JH |
845 | # ifndef GNUTLS_SEC_PARAM_MEDIUM |
846 | # define GNUTLS_SEC_PARAM_MEDIUM GNUTLS_SEC_PARAM_HIGH | |
847 | # endif | |
6aac3239 | 848 | gnutls_sec_param_to_pk_bits(GNUTLS_PK_RSA, GNUTLS_SEC_PARAM_MEDIUM), |
76075bb5 | 849 | #else |
6aac3239 | 850 | 2048, |
76075bb5 JH |
851 | #endif |
852 | 0))) | |
23bb6982 JH |
853 | goto err; |
854 | ||
855 | where = US"configuring cert"; | |
1613fd68 | 856 | now = 1; |
23bb6982 JH |
857 | if ( (rc = gnutls_x509_crt_set_version(cert, 3)) |
858 | || (rc = gnutls_x509_crt_set_serial(cert, &now, sizeof(now))) | |
859 | || (rc = gnutls_x509_crt_set_activation_time(cert, now = time(NULL))) | |
860 | || (rc = gnutls_x509_crt_set_expiration_time(cert, now + 60 * 60)) /* 1 hr */ | |
861 | || (rc = gnutls_x509_crt_set_key(cert, pkey)) | |
862 | ||
863 | || (rc = gnutls_x509_crt_set_dn_by_oid(cert, | |
864 | GNUTLS_OID_X520_COUNTRY_NAME, 0, "UK", 2)) | |
865 | || (rc = gnutls_x509_crt_set_dn_by_oid(cert, | |
866 | GNUTLS_OID_X520_ORGANIZATION_NAME, 0, "Exim Developers", 15)) | |
867 | || (rc = gnutls_x509_crt_set_dn_by_oid(cert, | |
868 | GNUTLS_OID_X520_COMMON_NAME, 0, | |
869 | smtp_active_hostname, Ustrlen(smtp_active_hostname))) | |
870 | ) | |
871 | goto err; | |
872 | ||
873 | where = US"signing cert"; | |
874 | if ((rc = gnutls_x509_crt_sign(cert, cert, pkey))) goto err; | |
875 | ||
876 | where = US"installing selfsign cert"; | |
877 | /* Since: 2.4.0 */ | |
878 | if ((rc = gnutls_certificate_set_x509_key(state->x509_cred, &cert, 1, pkey))) | |
879 | goto err; | |
880 | ||
881 | rc = OK; | |
882 | ||
883 | out: | |
884 | if (cert) gnutls_x509_crt_deinit(cert); | |
885 | if (pkey) gnutls_x509_privkey_deinit(pkey); | |
886 | return rc; | |
887 | ||
888 | err: | |
452a164f | 889 | rc = tls_error_gnu(where, rc, NULL, errstr); |
23bb6982 JH |
890 | goto out; |
891 | } | |
892 | ||
893 | ||
894 | ||
895 | ||
47195144 JH |
896 | /* Add certificate and key, from files. |
897 | ||
898 | Return: | |
899 | Zero or negative: good. Negate value for certificate index if < 0. | |
900 | Greater than zero: FAIL or DEFER code. | |
901 | */ | |
902 | ||
ba86e143 JH |
903 | static int |
904 | tls_add_certfile(exim_gnutls_state_st * state, const host_item * host, | |
905 | uschar * certfile, uschar * keyfile, uschar ** errstr) | |
906 | { | |
907 | int rc = gnutls_certificate_set_x509_key_file(state->x509_cred, | |
908 | CS certfile, CS keyfile, GNUTLS_X509_FMT_PEM); | |
47195144 | 909 | if (rc < 0) |
452a164f | 910 | return tls_error_gnu( |
47195144 | 911 | string_sprintf("cert/key setup: cert=%s key=%s", certfile, keyfile), |
452a164f | 912 | rc, host, errstr); |
47195144 | 913 | return -rc; |
ba86e143 JH |
914 | } |
915 | ||
916 | ||
d896cef5 JH |
917 | #if !defined(DISABLE_OCSP) && !defined(SUPPORT_GNUTLS_EXT_RAW_PARSE) |
918 | /* Load an OCSP proof from file for sending by the server. Called | |
919 | on getting a status-request handshake message, for earlier versions | |
920 | of GnuTLS. */ | |
921 | ||
922 | static int | |
923 | server_ocsp_stapling_cb(gnutls_session_t session, void * ptr, | |
924 | gnutls_datum_t * ocsp_response) | |
925 | { | |
926 | int ret; | |
927 | DEBUG(D_tls) debug_printf("OCSP stapling callback: %s\n", US ptr); | |
928 | ||
929 | if ((ret = gnutls_load_file(ptr, ocsp_response)) < 0) | |
930 | { | |
931 | DEBUG(D_tls) debug_printf("Failed to load ocsp stapling file %s\n", | |
932 | CS ptr); | |
933 | tls_in.ocsp = OCSP_NOT_RESP; | |
934 | return GNUTLS_E_NO_CERTIFICATE_STATUS; | |
935 | } | |
936 | ||
937 | tls_in.ocsp = OCSP_VFY_NOT_TRIED; | |
938 | return 0; | |
939 | } | |
940 | #endif | |
941 | ||
942 | ||
be427508 | 943 | #ifdef SUPPORT_GNUTLS_EXT_RAW_PARSE |
e5489333 JH |
944 | /* Make a note that we saw a status-request */ |
945 | static int | |
946 | tls_server_clienthello_ext(void * ctx, unsigned tls_id, | |
947 | const unsigned char *data, unsigned size) | |
948 | { | |
949 | /* https://www.iana.org/assignments/tls-extensiontype-values/tls-extensiontype-values.xhtml */ | |
950 | if (tls_id == 5) /* status_request */ | |
951 | { | |
e326959e | 952 | DEBUG(D_tls) debug_printf("Seen status_request extension from client\n"); |
e5489333 JH |
953 | tls_in.ocsp = OCSP_NOT_RESP; |
954 | } | |
955 | return 0; | |
956 | } | |
957 | ||
958 | /* Callback for client-hello, on server, if we think we might serve stapled-OCSP */ | |
959 | static int | |
960 | tls_server_clienthello_cb(gnutls_session_t session, unsigned int htype, | |
961 | unsigned when, unsigned int incoming, const gnutls_datum_t * msg) | |
962 | { | |
963 | /* Call fn for each extension seen. 3.6.3 onwards */ | |
964 | return gnutls_ext_raw_parse(NULL, tls_server_clienthello_ext, msg, | |
965 | GNUTLS_EXT_RAW_FLAG_TLS_CLIENT_HELLO); | |
966 | } | |
e326959e JH |
967 | |
968 | ||
969 | /* Make a note that we saw a status-response */ | |
970 | static int | |
971 | tls_server_servercerts_ext(void * ctx, unsigned tls_id, | |
972 | const unsigned char *data, unsigned size) | |
973 | { | |
974 | /* debug_printf("%s %u\n", __FUNCTION__, tls_id); */ | |
975 | /* https://www.iana.org/assignments/tls-extensiontype-values/tls-extensiontype-values.xhtml */ | |
976 | if (FALSE && tls_id == 5) /* status_request */ | |
977 | { | |
978 | DEBUG(D_tls) debug_printf("Seen status_request extension\n"); | |
979 | tls_in.ocsp = exim_testharness_disable_ocsp_validity_check | |
980 | ? OCSP_VFY_NOT_TRIED : OCSP_VFIED; /* We know that GnuTLS verifies responses */ | |
981 | } | |
982 | return 0; | |
983 | } | |
984 | ||
985 | /* Callback for certificates packet, on server, if we think we might serve stapled-OCSP */ | |
986 | static int | |
987 | tls_server_servercerts_cb(gnutls_session_t session, unsigned int htype, | |
988 | unsigned when, unsigned int incoming, const gnutls_datum_t * msg) | |
989 | { | |
990 | /* Call fn for each extension seen. 3.6.3 onwards */ | |
991 | #ifdef notdef | |
992 | /*XXX crashes */ | |
993 | return gnutls_ext_raw_parse(NULL, tls_server_servercerts_ext, msg, 0); | |
994 | #endif | |
995 | } | |
be427508 | 996 | #endif |
e5489333 | 997 | |
e326959e JH |
998 | /*XXX in tls1.3 the cert-status travel as an extension next to the cert, in the |
999 | "Handshake Protocol: Certificate" record. | |
1000 | So we need to spot the Certificate handshake message, parse it and spot any status_request extension(s) | |
1001 | ||
1002 | This is different to tls1.2 - where it is a separate record (wireshake term) / handshake message (gnutls term). | |
1003 | */ | |
1004 | ||
727a5d25 | 1005 | #if defined(EXPERIMENTAL_TLS_RESUME) || defined(SUPPORT_GNUTLS_EXT_RAW_PARSE) |
e5489333 JH |
1006 | /* Callback for certificate-status, on server. We sent stapled OCSP. */ |
1007 | static int | |
1008 | tls_server_certstatus_cb(gnutls_session_t session, unsigned int htype, | |
1009 | unsigned when, unsigned int incoming, const gnutls_datum_t * msg) | |
1010 | { | |
e326959e | 1011 | DEBUG(D_tls) debug_printf("Sending certificate-status\n"); /*XXX we get this for tls1.2 but not for 1.3 */ |
e5489333 JH |
1012 | #ifdef SUPPORT_SRV_OCSP_STACK |
1013 | tls_in.ocsp = exim_testharness_disable_ocsp_validity_check | |
1014 | ? OCSP_VFY_NOT_TRIED : OCSP_VFIED; /* We know that GnuTLS verifies responses */ | |
1015 | #else | |
1016 | tls_in.ocsp = OCSP_VFY_NOT_TRIED; | |
1017 | #endif | |
1018 | return 0; | |
1019 | } | |
1020 | ||
1021 | /* Callback for handshake messages, on server */ | |
1022 | static int | |
1023 | tls_server_hook_cb(gnutls_session_t sess, u_int htype, unsigned when, | |
1024 | unsigned incoming, const gnutls_datum_t * msg) | |
1025 | { | |
e326959e | 1026 | /* debug_printf("%s: htype %u\n", __FUNCTION__, htype); */ |
e5489333 JH |
1027 | switch (htype) |
1028 | { | |
727a5d25 | 1029 | # ifdef SUPPORT_GNUTLS_EXT_RAW_PARSE |
e5489333 JH |
1030 | case GNUTLS_HANDSHAKE_CLIENT_HELLO: |
1031 | return tls_server_clienthello_cb(sess, htype, when, incoming, msg); | |
e326959e JH |
1032 | case GNUTLS_HANDSHAKE_CERTIFICATE_PKT: |
1033 | return tls_server_servercerts_cb(sess, htype, when, incoming, msg); | |
727a5d25 | 1034 | # endif |
e5489333 JH |
1035 | case GNUTLS_HANDSHAKE_CERTIFICATE_STATUS: |
1036 | return tls_server_certstatus_cb(sess, htype, when, incoming, msg); | |
727a5d25 | 1037 | # ifdef EXPERIMENTAL_TLS_RESUME |
e5489333 JH |
1038 | case GNUTLS_HANDSHAKE_NEW_SESSION_TICKET: |
1039 | return tls_server_ticket_cb(sess, htype, when, incoming, msg); | |
727a5d25 | 1040 | # endif |
e5489333 JH |
1041 | default: |
1042 | return 0; | |
1043 | } | |
1044 | } | |
727a5d25 | 1045 | #endif |
e5489333 JH |
1046 | |
1047 | ||
727a5d25 | 1048 | #if !defined(DISABLE_OCSP) && defined(SUPPORT_GNUTLS_EXT_RAW_PARSE) |
e5489333 JH |
1049 | static void |
1050 | tls_server_testharness_ocsp_fiddle(void) | |
1051 | { | |
1052 | extern char ** environ; | |
1053 | if (environ) for (uschar ** p = USS environ; *p; p++) | |
1054 | if (Ustrncmp(*p, "EXIM_TESTHARNESS_DISABLE_OCSPVALIDITYCHECK", 42) == 0) | |
1055 | { | |
1056 | DEBUG(D_tls) debug_printf("Permitting known bad OCSP response\n"); | |
1057 | exim_testharness_disable_ocsp_validity_check = TRUE; | |
1058 | } | |
1059 | } | |
727a5d25 | 1060 | #endif |
e5489333 | 1061 | |
059ec3d9 | 1062 | /************************************************* |
17c76198 | 1063 | * Variables re-expanded post-SNI * |
059ec3d9 PH |
1064 | *************************************************/ |
1065 | ||
17c76198 PP |
1066 | /* Called from both server and client code, via tls_init(), and also from |
1067 | the SNI callback after receiving an SNI, if tls_certificate includes "tls_sni". | |
1068 | ||
1069 | We can tell the two apart by state->received_sni being non-NULL in callback. | |
1070 | ||
1071 | The callback should not call us unless state->trigger_sni_changes is true, | |
1072 | which we are responsible for setting on the first pass through. | |
059ec3d9 PH |
1073 | |
1074 | Arguments: | |
17c76198 | 1075 | state exim_gnutls_state_st * |
cf0c6164 | 1076 | errstr error string pointer |
059ec3d9 PH |
1077 | |
1078 | Returns: OK/DEFER/FAIL | |
1079 | */ | |
1080 | ||
1081 | static int | |
ba86e143 | 1082 | tls_expand_session_files(exim_gnutls_state_st * state, uschar ** errstr) |
059ec3d9 | 1083 | { |
1365611d | 1084 | struct stat statbuf; |
059ec3d9 | 1085 | int rc; |
17c76198 PP |
1086 | const host_item *host = state->host; /* macro should be reconsidered? */ |
1087 | uschar *saved_tls_certificate = NULL; | |
1088 | uschar *saved_tls_privatekey = NULL; | |
1089 | uschar *saved_tls_verify_certificates = NULL; | |
1090 | uschar *saved_tls_crl = NULL; | |
1091 | int cert_count; | |
1092 | ||
1093 | /* We check for tls_sni *before* expansion. */ | |
2b4a568d | 1094 | if (!host) /* server */ |
17c76198 PP |
1095 | if (!state->received_sni) |
1096 | { | |
ba86e143 JH |
1097 | if ( state->tls_certificate |
1098 | && ( Ustrstr(state->tls_certificate, US"tls_sni") | |
1099 | || Ustrstr(state->tls_certificate, US"tls_in_sni") | |
1100 | || Ustrstr(state->tls_certificate, US"tls_out_sni") | |
1101 | ) ) | |
17c76198 PP |
1102 | { |
1103 | DEBUG(D_tls) debug_printf("We will re-expand TLS session files if we receive SNI.\n"); | |
1104 | state->trigger_sni_changes = TRUE; | |
1105 | } | |
1106 | } | |
1107 | else | |
1108 | { | |
1365611d | 1109 | /* useful for debugging */ |
17c76198 PP |
1110 | saved_tls_certificate = state->exp_tls_certificate; |
1111 | saved_tls_privatekey = state->exp_tls_privatekey; | |
1112 | saved_tls_verify_certificates = state->exp_tls_verify_certificates; | |
1113 | saved_tls_crl = state->exp_tls_crl; | |
1114 | } | |
059ec3d9 | 1115 | |
452a164f JH |
1116 | if ((rc = gnutls_certificate_allocate_credentials(&state->x509_cred))) |
1117 | return tls_error_gnu(US"gnutls_certificate_allocate_credentials", | |
1118 | rc, host, errstr); | |
47195144 JH |
1119 | |
1120 | #ifdef SUPPORT_SRV_OCSP_STACK | |
1121 | gnutls_certificate_set_flags(state->x509_cred, GNUTLS_CERTIFICATE_API_V2); | |
e326959e JH |
1122 | |
1123 | # if !defined(DISABLE_OCSP) && defined(SUPPORT_GNUTLS_EXT_RAW_PARSE) | |
1124 | if (!host && tls_ocsp_file) | |
1125 | { | |
1126 | if (f.running_in_test_harness) | |
1127 | tls_server_testharness_ocsp_fiddle(); | |
1128 | ||
1129 | if (exim_testharness_disable_ocsp_validity_check) | |
1130 | gnutls_certificate_set_flags(state->x509_cred, | |
1131 | GNUTLS_CERTIFICATE_API_V2 | GNUTLS_CERTIFICATE_SKIP_OCSP_RESPONSE_CHECK); | |
1132 | } | |
1133 | # endif | |
47195144 | 1134 | #endif |
1365611d | 1135 | |
17c76198 PP |
1136 | /* remember: expand_check_tlsvar() is expand_check() but fiddling with |
1137 | state members, assuming consistent naming; and expand_check() returns | |
1138 | false if expansion failed, unless expansion was forced to fail. */ | |
059ec3d9 | 1139 | |
17c76198 PP |
1140 | /* check if we at least have a certificate, before doing expensive |
1141 | D-H generation. */ | |
059ec3d9 | 1142 | |
cf0c6164 | 1143 | if (!expand_check_tlsvar(tls_certificate, errstr)) |
17c76198 | 1144 | return DEFER; |
059ec3d9 | 1145 | |
17c76198 | 1146 | /* certificate is mandatory in server, optional in client */ |
059ec3d9 | 1147 | |
23bb6982 JH |
1148 | if ( !state->exp_tls_certificate |
1149 | || !*state->exp_tls_certificate | |
1150 | ) | |
2b4a568d | 1151 | if (!host) |
cf0c6164 | 1152 | return tls_install_selfsign(state, errstr); |
17c76198 PP |
1153 | else |
1154 | DEBUG(D_tls) debug_printf("TLS: no client certificate specified; okay\n"); | |
059ec3d9 | 1155 | |
cf0c6164 | 1156 | if (state->tls_privatekey && !expand_check_tlsvar(tls_privatekey, errstr)) |
059ec3d9 PH |
1157 | return DEFER; |
1158 | ||
17c76198 PP |
1159 | /* tls_privatekey is optional, defaulting to same file as certificate */ |
1160 | ||
e326959e | 1161 | if (!state->tls_privatekey || !*state->tls_privatekey) |
059ec3d9 | 1162 | { |
17c76198 PP |
1163 | state->tls_privatekey = state->tls_certificate; |
1164 | state->exp_tls_privatekey = state->exp_tls_certificate; | |
059ec3d9 | 1165 | } |
c91535f3 | 1166 | |
059ec3d9 | 1167 | |
17c76198 | 1168 | if (state->exp_tls_certificate && *state->exp_tls_certificate) |
059ec3d9 PH |
1169 | { |
1170 | DEBUG(D_tls) debug_printf("certificate file = %s\nkey file = %s\n", | |
17c76198 PP |
1171 | state->exp_tls_certificate, state->exp_tls_privatekey); |
1172 | ||
1173 | if (state->received_sni) | |
23bb6982 JH |
1174 | if ( Ustrcmp(state->exp_tls_certificate, saved_tls_certificate) == 0 |
1175 | && Ustrcmp(state->exp_tls_privatekey, saved_tls_privatekey) == 0 | |
1176 | ) | |
17c76198 | 1177 | { |
b34fc30c | 1178 | DEBUG(D_tls) debug_printf("TLS SNI: cert and key unchanged\n"); |
17c76198 PP |
1179 | } |
1180 | else | |
1181 | { | |
b34fc30c | 1182 | DEBUG(D_tls) debug_printf("TLS SNI: have a changed cert/key pair.\n"); |
17c76198 | 1183 | } |
059ec3d9 | 1184 | |
ba86e143 JH |
1185 | if (!host) /* server */ |
1186 | { | |
1187 | const uschar * clist = state->exp_tls_certificate; | |
1188 | const uschar * klist = state->exp_tls_privatekey; | |
47195144 JH |
1189 | const uschar * olist; |
1190 | int csep = 0, ksep = 0, osep = 0, cnt = 0; | |
1191 | uschar * cfile, * kfile, * ofile; | |
47195144 | 1192 | #ifndef DISABLE_OCSP |
e326959e JH |
1193 | # ifdef SUPPORT_GNUTLS_EXT_RAW_PARSE |
1194 | gnutls_x509_crt_fmt_t ocsp_fmt = GNUTLS_X509_FMT_DER; | |
1195 | # endif | |
1196 | ||
47195144 JH |
1197 | if (!expand_check(tls_ocsp_file, US"tls_ocsp_file", &ofile, errstr)) |
1198 | return DEFER; | |
1199 | olist = ofile; | |
1200 | #endif | |
ba86e143 JH |
1201 | |
1202 | while (cfile = string_nextinlist(&clist, &csep, NULL, 0)) | |
47195144 | 1203 | |
ba86e143 JH |
1204 | if (!(kfile = string_nextinlist(&klist, &ksep, NULL, 0))) |
1205 | return tls_error(US"cert/key setup: out of keys", NULL, host, errstr); | |
47195144 | 1206 | else if (0 < (rc = tls_add_certfile(state, host, cfile, kfile, errstr))) |
ba86e143 JH |
1207 | return rc; |
1208 | else | |
47195144 JH |
1209 | { |
1210 | int gnutls_cert_index = -rc; | |
e326959e JH |
1211 | DEBUG(D_tls) debug_printf("TLS: cert/key %d %s registered\n", |
1212 | gnutls_cert_index, cfile); | |
47195144 JH |
1213 | |
1214 | #ifndef DISABLE_OCSP | |
1215 | if (tls_ocsp_file) | |
e5489333 | 1216 | { |
e326959e | 1217 | /* Set the OCSP stapling server info */ |
47195144 JH |
1218 | if (gnutls_buggy_ocsp) |
1219 | { | |
1220 | DEBUG(D_tls) | |
1221 | debug_printf("GnuTLS library is buggy for OCSP; avoiding\n"); | |
1222 | } | |
1223 | else if ((ofile = string_nextinlist(&olist, &osep, NULL, 0))) | |
1224 | { | |
e326959e JH |
1225 | DEBUG(D_tls) debug_printf("OCSP response file %d = %s\n", |
1226 | gnutls_cert_index, ofile); | |
be427508 | 1227 | # ifdef SUPPORT_GNUTLS_EXT_RAW_PARSE |
e326959e | 1228 | if (Ustrncmp(ofile, US"PEM ", 4) == 0) |
47195144 | 1229 | { |
e326959e JH |
1230 | ocsp_fmt = GNUTLS_X509_FMT_PEM; |
1231 | ofile += 4; | |
1232 | } | |
1233 | else if (Ustrncmp(ofile, US"DER ", 4) == 0) | |
1234 | { | |
1235 | ocsp_fmt = GNUTLS_X509_FMT_DER; | |
1236 | ofile += 4; | |
1237 | } | |
e5489333 | 1238 | |
e326959e JH |
1239 | if ((rc = gnutls_certificate_set_ocsp_status_request_file2( |
1240 | state->x509_cred, CCS ofile, gnutls_cert_index, | |
1241 | ocsp_fmt)) < 0) | |
1242 | return tls_error_gnu( | |
1243 | US"gnutls_certificate_set_ocsp_status_request_file2", | |
1244 | rc, host, errstr); | |
1245 | DEBUG(D_tls) | |
1246 | debug_printf(" %d response%s loaded\n", rc, rc>1 ? "s":""); | |
e5489333 | 1247 | |
e326959e JH |
1248 | /* Arrange callbacks for OCSP request observability */ |
1249 | ||
1250 | gnutls_handshake_set_hook_function(state->session, | |
1251 | GNUTLS_HANDSHAKE_ANY, GNUTLS_HOOK_POST, tls_server_hook_cb); | |
1252 | ||
1253 | # else | |
1254 | # if defined(SUPPORT_SRV_OCSP_STACK) | |
be427508 JH |
1255 | if ((rc = gnutls_certificate_set_ocsp_status_request_function2( |
1256 | state->x509_cred, gnutls_cert_index, | |
1257 | server_ocsp_stapling_cb, ofile))) | |
1258 | return tls_error_gnu( | |
1259 | US"gnutls_certificate_set_ocsp_status_request_function2", | |
1260 | rc, host, errstr); | |
1261 | else | |
e326959e | 1262 | # endif |
e5489333 JH |
1263 | { |
1264 | if (cnt++ > 0) | |
1265 | { | |
1266 | DEBUG(D_tls) | |
1267 | debug_printf("oops; multiple OCSP files not supported\n"); | |
1268 | break; | |
1269 | } | |
d896cef5 JH |
1270 | gnutls_certificate_set_ocsp_status_request_function( |
1271 | state->x509_cred, server_ocsp_stapling_cb, ofile); | |
e5489333 | 1272 | } |
e326959e | 1273 | # endif /* SUPPORT_GNUTLS_EXT_RAW_PARSE */ |
47195144 JH |
1274 | } |
1275 | else | |
1276 | DEBUG(D_tls) debug_printf("ran out of OCSP response files in list\n"); | |
e5489333 | 1277 | } |
fd71e7b8 | 1278 | #endif /* DISABLE_OCSP */ |
47195144 | 1279 | } |
ba86e143 | 1280 | } |
e5489333 | 1281 | else /* client */ |
ba86e143 | 1282 | { |
47195144 | 1283 | if (0 < (rc = tls_add_certfile(state, host, |
ba86e143 JH |
1284 | state->exp_tls_certificate, state->exp_tls_privatekey, errstr))) |
1285 | return rc; | |
1286 | DEBUG(D_tls) debug_printf("TLS: cert/key registered\n"); | |
1287 | } | |
1288 | ||
b34fc30c | 1289 | } /* tls_certificate */ |
059ec3d9 | 1290 | |
2b4a568d | 1291 | |
059ec3d9 PH |
1292 | /* Set the trusted CAs file if one is provided, and then add the CRL if one is |
1293 | provided. Experiment shows that, if the certificate file is empty, an unhelpful | |
1294 | error message is provided. However, if we just refrain from setting anything up | |
1295 | in that case, certificate verification fails, which seems to be the correct | |
1296 | behaviour. */ | |
1297 | ||
610ff438 | 1298 | if (state->tls_verify_certificates && *state->tls_verify_certificates) |
059ec3d9 | 1299 | { |
cf0c6164 | 1300 | if (!expand_check_tlsvar(tls_verify_certificates, errstr)) |
059ec3d9 | 1301 | return DEFER; |
610ff438 JH |
1302 | #ifndef SUPPORT_SYSDEFAULT_CABUNDLE |
1303 | if (Ustrcmp(state->exp_tls_verify_certificates, "system") == 0) | |
1304 | state->exp_tls_verify_certificates = NULL; | |
1305 | #endif | |
17c76198 | 1306 | if (state->tls_crl && *state->tls_crl) |
cf0c6164 | 1307 | if (!expand_check_tlsvar(tls_crl, errstr)) |
17c76198 | 1308 | return DEFER; |
059ec3d9 | 1309 | |
1365611d PP |
1310 | if (!(state->exp_tls_verify_certificates && |
1311 | *state->exp_tls_verify_certificates)) | |
b34fc30c PP |
1312 | { |
1313 | DEBUG(D_tls) | |
1365611d PP |
1314 | debug_printf("TLS: tls_verify_certificates expanded empty, ignoring\n"); |
1315 | /* With no tls_verify_certificates, we ignore tls_crl too */ | |
17c76198 | 1316 | return OK; |
b34fc30c | 1317 | } |
1365611d | 1318 | } |
83e2f8a2 PP |
1319 | else |
1320 | { | |
1321 | DEBUG(D_tls) | |
1322 | debug_printf("TLS: tls_verify_certificates not set or empty, ignoring\n"); | |
1323 | return OK; | |
1324 | } | |
17c76198 | 1325 | |
cb1d7830 JH |
1326 | #ifdef SUPPORT_SYSDEFAULT_CABUNDLE |
1327 | if (Ustrcmp(state->exp_tls_verify_certificates, "system") == 0) | |
1328 | cert_count = gnutls_certificate_set_x509_system_trust(state->x509_cred); | |
1329 | else | |
1330 | #endif | |
1365611d | 1331 | { |
cb1d7830 JH |
1332 | if (Ustat(state->exp_tls_verify_certificates, &statbuf) < 0) |
1333 | { | |
d896cef5 | 1334 | log_write(0, LOG_MAIN|LOG_PANIC, "could not stat '%s' " |
cb1d7830 JH |
1335 | "(tls_verify_certificates): %s", state->exp_tls_verify_certificates, |
1336 | strerror(errno)); | |
1337 | return DEFER; | |
1338 | } | |
17c76198 | 1339 | |
a7fec7a7 | 1340 | #ifndef SUPPORT_CA_DIR |
cb1d7830 JH |
1341 | /* The test suite passes in /dev/null; we could check for that path explicitly, |
1342 | but who knows if someone has some weird FIFO which always dumps some certs, or | |
1343 | other weirdness. The thing we really want to check is that it's not a | |
1344 | directory, since while OpenSSL supports that, GnuTLS does not. | |
60f914bc | 1345 | So s/!S_ISREG/S_ISDIR/ and change some messaging ... */ |
cb1d7830 JH |
1346 | if (S_ISDIR(statbuf.st_mode)) |
1347 | { | |
1348 | DEBUG(D_tls) | |
1349 | debug_printf("verify certificates path is a dir: \"%s\"\n", | |
1350 | state->exp_tls_verify_certificates); | |
1351 | log_write(0, LOG_MAIN|LOG_PANIC, | |
1352 | "tls_verify_certificates \"%s\" is a directory", | |
1353 | state->exp_tls_verify_certificates); | |
1354 | return DEFER; | |
1355 | } | |
a7fec7a7 | 1356 | #endif |
059ec3d9 | 1357 | |
cb1d7830 JH |
1358 | DEBUG(D_tls) debug_printf("verify certificates = %s size=" OFF_T_FMT "\n", |
1359 | state->exp_tls_verify_certificates, statbuf.st_size); | |
059ec3d9 | 1360 | |
cb1d7830 JH |
1361 | if (statbuf.st_size == 0) |
1362 | { | |
1363 | DEBUG(D_tls) | |
1364 | debug_printf("cert file empty, no certs, no verification, ignoring any CRL\n"); | |
1365 | return OK; | |
1366 | } | |
059ec3d9 | 1367 | |
cb1d7830 | 1368 | cert_count = |
a7fec7a7 JH |
1369 | |
1370 | #ifdef SUPPORT_CA_DIR | |
cb1d7830 JH |
1371 | (statbuf.st_mode & S_IFMT) == S_IFDIR |
1372 | ? | |
1373 | gnutls_certificate_set_x509_trust_dir(state->x509_cred, | |
1374 | CS state->exp_tls_verify_certificates, GNUTLS_X509_FMT_PEM) | |
1375 | : | |
a7fec7a7 | 1376 | #endif |
cb1d7830 JH |
1377 | gnutls_certificate_set_x509_trust_file(state->x509_cred, |
1378 | CS state->exp_tls_verify_certificates, GNUTLS_X509_FMT_PEM); | |
12d95aa6 JH |
1379 | |
1380 | #ifdef SUPPORT_CA_DIR | |
1381 | /* Mimic the behaviour with OpenSSL of not advertising a usable-cert list | |
1382 | when using the directory-of-certs config model. */ | |
1383 | ||
1384 | if ((statbuf.st_mode & S_IFMT) == S_IFDIR) | |
1385 | gnutls_certificate_send_x509_rdn_sequence(state->session, 1); | |
1386 | #endif | |
cb1d7830 | 1387 | } |
a7fec7a7 | 1388 | |
1365611d | 1389 | if (cert_count < 0) |
452a164f JH |
1390 | return tls_error_gnu(US"setting certificate trust", cert_count, host, errstr); |
1391 | DEBUG(D_tls) | |
1392 | debug_printf("Added %d certificate authorities.\n", cert_count); | |
059ec3d9 | 1393 | |
5c8cda3a PP |
1394 | if (state->tls_crl && *state->tls_crl && |
1395 | state->exp_tls_crl && *state->exp_tls_crl) | |
1365611d | 1396 | { |
5c8cda3a | 1397 | DEBUG(D_tls) debug_printf("loading CRL file = %s\n", state->exp_tls_crl); |
452a164f JH |
1398 | if ((cert_count = gnutls_certificate_set_x509_crl_file(state->x509_cred, |
1399 | CS state->exp_tls_crl, GNUTLS_X509_FMT_PEM)) < 0) | |
1400 | return tls_error_gnu(US"gnutls_certificate_set_x509_crl_file", | |
1401 | cert_count, host, errstr); | |
1402 | ||
5c8cda3a | 1403 | DEBUG(D_tls) debug_printf("Processed %d CRLs.\n", cert_count); |
1365611d | 1404 | } |
059ec3d9 | 1405 | |
059ec3d9 PH |
1406 | return OK; |
1407 | } | |
1408 | ||
1409 | ||
1410 | ||
1411 | ||
1365611d PP |
1412 | /************************************************* |
1413 | * Set X.509 state variables * | |
1414 | *************************************************/ | |
1415 | ||
1416 | /* In GnuTLS, the registered cert/key are not replaced by a later | |
1417 | set of a cert/key, so for SNI support we need a whole new x509_cred | |
1418 | structure. Which means various other non-re-expanded pieces of state | |
1419 | need to be re-set in the new struct, so the setting logic is pulled | |
1420 | out to this. | |
1421 | ||
1422 | Arguments: | |
1423 | state exim_gnutls_state_st * | |
cf0c6164 | 1424 | errstr error string pointer |
1365611d PP |
1425 | |
1426 | Returns: OK/DEFER/FAIL | |
1427 | */ | |
1428 | ||
1429 | static int | |
cf0c6164 | 1430 | tls_set_remaining_x509(exim_gnutls_state_st *state, uschar ** errstr) |
1365611d PP |
1431 | { |
1432 | int rc; | |
1433 | const host_item *host = state->host; /* macro should be reconsidered? */ | |
1434 | ||
49132a3b | 1435 | #ifndef GNUTLS_AUTO_DHPARAMS |
1365611d PP |
1436 | /* Create D-H parameters, or read them from the cache file. This function does |
1437 | its own SMTP error messaging. This only happens for the server, TLS D-H ignores | |
1438 | client-side params. */ | |
1439 | ||
1440 | if (!state->host) | |
1441 | { | |
1442 | if (!dh_server_params) | |
452a164f | 1443 | if ((rc = init_server_dh(errstr)) != OK) return rc; |
49132a3b JH |
1444 | |
1445 | /* Unnecessary & discouraged with 3.6.0 or later */ | |
1365611d PP |
1446 | gnutls_certificate_set_dh_params(state->x509_cred, dh_server_params); |
1447 | } | |
49132a3b | 1448 | #endif |
1365611d PP |
1449 | |
1450 | /* Link the credentials to the session. */ | |
1451 | ||
452a164f JH |
1452 | if ((rc = gnutls_credentials_set(state->session, |
1453 | GNUTLS_CRD_CERTIFICATE, state->x509_cred))) | |
1454 | return tls_error_gnu(US"gnutls_credentials_set", rc, host, errstr); | |
1365611d PP |
1455 | |
1456 | return OK; | |
1457 | } | |
1458 | ||
059ec3d9 | 1459 | /************************************************* |
17c76198 | 1460 | * Initialize for GnuTLS * |
059ec3d9 PH |
1461 | *************************************************/ |
1462 | ||
9196d5bf | 1463 | |
4fb7df6d JH |
1464 | #ifndef DISABLE_OCSP |
1465 | ||
9196d5bf JH |
1466 | static BOOL |
1467 | tls_is_buggy_ocsp(void) | |
1468 | { | |
1469 | const uschar * s; | |
1470 | uschar maj, mid, mic; | |
1471 | ||
1472 | s = CUS gnutls_check_version(NULL); | |
1473 | maj = atoi(CCS s); | |
1474 | if (maj == 3) | |
1475 | { | |
1476 | while (*s && *s != '.') s++; | |
1477 | mid = atoi(CCS ++s); | |
1478 | if (mid <= 2) | |
1479 | return TRUE; | |
1480 | else if (mid >= 5) | |
1481 | return FALSE; | |
1482 | else | |
1483 | { | |
1484 | while (*s && *s != '.') s++; | |
1485 | mic = atoi(CCS ++s); | |
1486 | return mic <= (mid == 3 ? 16 : 3); | |
1487 | } | |
1488 | } | |
1489 | return FALSE; | |
1490 | } | |
1491 | ||
4fb7df6d | 1492 | #endif |
9196d5bf JH |
1493 | |
1494 | ||
17c76198 PP |
1495 | /* Called from both server and client code. In the case of a server, errors |
1496 | before actual TLS negotiation return DEFER. | |
059ec3d9 PH |
1497 | |
1498 | Arguments: | |
17c76198 PP |
1499 | host connected host, if client; NULL if server |
1500 | certificate certificate file | |
1501 | privatekey private key file | |
1502 | sni TLS SNI to send, sometimes when client; else NULL | |
1503 | cas CA certs file | |
1504 | crl CRL file | |
1505 | require_ciphers tls_require_ciphers setting | |
817d9f57 | 1506 | caller_state returned state-info structure |
cf0c6164 | 1507 | errstr error string pointer |
059ec3d9 | 1508 | |
17c76198 | 1509 | Returns: OK/DEFER/FAIL |
059ec3d9 PH |
1510 | */ |
1511 | ||
17c76198 PP |
1512 | static int |
1513 | tls_init( | |
1514 | const host_item *host, | |
1515 | const uschar *certificate, | |
1516 | const uschar *privatekey, | |
1517 | const uschar *sni, | |
1518 | const uschar *cas, | |
1519 | const uschar *crl, | |
1520 | const uschar *require_ciphers, | |
cf0c6164 | 1521 | exim_gnutls_state_st **caller_state, |
74f1a423 | 1522 | tls_support * tlsp, |
cf0c6164 | 1523 | uschar ** errstr) |
059ec3d9 | 1524 | { |
00c0dd4e | 1525 | exim_gnutls_state_st * state; |
17c76198 PP |
1526 | int rc; |
1527 | size_t sz; | |
00c0dd4e JH |
1528 | const char * errpos; |
1529 | const uschar * p; | |
17c76198 PP |
1530 | |
1531 | if (!exim_gnutls_base_init_done) | |
059ec3d9 | 1532 | { |
17c76198 PP |
1533 | DEBUG(D_tls) debug_printf("GnuTLS global init required.\n"); |
1534 | ||
9f707b89 | 1535 | #if defined(HAVE_GNUTLS_PKCS11) && !defined(GNUTLS_AUTO_PKCS11_MANUAL) |
a5f239e4 PP |
1536 | /* By default, gnutls_global_init will init PKCS11 support in auto mode, |
1537 | which loads modules from a config file, which sounds good and may be wanted | |
1538 | by some sysadmin, but also means in common configurations that GNOME keyring | |
1539 | environment variables are used and so breaks for users calling mailq. | |
1540 | To prevent this, we init PKCS11 first, which is the documented approach. */ | |
2519e60d | 1541 | if (!gnutls_allow_auto_pkcs11) |
452a164f JH |
1542 | if ((rc = gnutls_pkcs11_init(GNUTLS_PKCS11_FLAG_MANUAL, NULL))) |
1543 | return tls_error_gnu(US"gnutls_pkcs11_init", rc, host, errstr); | |
a5f239e4 PP |
1544 | #endif |
1545 | ||
4d2a62a3 | 1546 | #ifndef GNUTLS_AUTO_GLOBAL_INIT |
452a164f JH |
1547 | if ((rc = gnutls_global_init())) |
1548 | return tls_error_gnu(US"gnutls_global_init", rc, host, errstr); | |
4d2a62a3 | 1549 | #endif |
17c76198 PP |
1550 | |
1551 | #if EXIM_GNUTLS_LIBRARY_LOG_LEVEL >= 0 | |
1552 | DEBUG(D_tls) | |
059ec3d9 | 1553 | { |
17c76198 | 1554 | gnutls_global_set_log_function(exim_gnutls_logger_cb); |
aded2255 | 1555 | /* arbitrarily chosen level; bump up to 9 for more */ |
17c76198 | 1556 | gnutls_global_set_log_level(EXIM_GNUTLS_LIBRARY_LOG_LEVEL); |
059ec3d9 | 1557 | } |
17c76198 PP |
1558 | #endif |
1559 | ||
4fb7df6d JH |
1560 | #ifndef DISABLE_OCSP |
1561 | if (tls_ocsp_file && (gnutls_buggy_ocsp = tls_is_buggy_ocsp())) | |
9196d5bf | 1562 | log_write(0, LOG_MAIN, "OCSP unusable with this GnuTLS library version"); |
4fb7df6d | 1563 | #endif |
9196d5bf | 1564 | |
17c76198 | 1565 | exim_gnutls_base_init_done = TRUE; |
059ec3d9 | 1566 | } |
059ec3d9 | 1567 | |
17c76198 PP |
1568 | if (host) |
1569 | { | |
74f1a423 JH |
1570 | /* For client-side sessions we allocate a context. This lets us run |
1571 | several in parallel. */ | |
1572 | int old_pool = store_pool; | |
1573 | store_pool = POOL_PERM; | |
f3ebb786 | 1574 | state = store_get(sizeof(exim_gnutls_state_st), FALSE); |
74f1a423 JH |
1575 | store_pool = old_pool; |
1576 | ||
17c76198 | 1577 | memcpy(state, &exim_gnutls_state_init, sizeof(exim_gnutls_state_init)); |
74f1a423 | 1578 | state->tlsp = tlsp; |
17c76198 PP |
1579 | DEBUG(D_tls) debug_printf("initialising GnuTLS client session\n"); |
1580 | rc = gnutls_init(&state->session, GNUTLS_CLIENT); | |
1581 | } | |
1582 | else | |
1583 | { | |
1584 | state = &state_server; | |
1585 | memcpy(state, &exim_gnutls_state_init, sizeof(exim_gnutls_state_init)); | |
74f1a423 | 1586 | state->tlsp = tlsp; |
17c76198 PP |
1587 | DEBUG(D_tls) debug_printf("initialising GnuTLS server session\n"); |
1588 | rc = gnutls_init(&state->session, GNUTLS_SERVER); | |
1589 | } | |
452a164f JH |
1590 | if (rc) |
1591 | return tls_error_gnu(US"gnutls_init", rc, host, errstr); | |
059ec3d9 | 1592 | |
17c76198 | 1593 | state->host = host; |
059ec3d9 | 1594 | |
17c76198 PP |
1595 | state->tls_certificate = certificate; |
1596 | state->tls_privatekey = privatekey; | |
5779e6aa | 1597 | state->tls_require_ciphers = require_ciphers; |
17c76198 PP |
1598 | state->tls_sni = sni; |
1599 | state->tls_verify_certificates = cas; | |
1600 | state->tls_crl = crl; | |
059ec3d9 | 1601 | |
17c76198 PP |
1602 | /* This handles the variables that might get re-expanded after TLS SNI; |
1603 | that's tls_certificate, tls_privatekey, tls_verify_certificates, tls_crl */ | |
059ec3d9 | 1604 | |
17c76198 PP |
1605 | DEBUG(D_tls) |
1606 | debug_printf("Expanding various TLS configuration options for session credentials.\n"); | |
cf0c6164 | 1607 | if ((rc = tls_expand_session_files(state, errstr)) != OK) return rc; |
059ec3d9 | 1608 | |
1365611d PP |
1609 | /* These are all other parts of the x509_cred handling, since SNI in GnuTLS |
1610 | requires a new structure afterwards. */ | |
83da1223 | 1611 | |
cf0c6164 | 1612 | if ((rc = tls_set_remaining_x509(state, errstr)) != OK) return rc; |
83da1223 | 1613 | |
17c76198 PP |
1614 | /* set SNI in client, only */ |
1615 | if (host) | |
1616 | { | |
cf0c6164 | 1617 | if (!expand_check(sni, US"tls_out_sni", &state->tlsp->sni, errstr)) |
17c76198 | 1618 | return DEFER; |
0df4ab80 | 1619 | if (state->tlsp->sni && *state->tlsp->sni) |
17c76198 PP |
1620 | { |
1621 | DEBUG(D_tls) | |
0df4ab80 JH |
1622 | debug_printf("Setting TLS client SNI to \"%s\"\n", state->tlsp->sni); |
1623 | sz = Ustrlen(state->tlsp->sni); | |
452a164f JH |
1624 | if ((rc = gnutls_server_name_set(state->session, |
1625 | GNUTLS_NAME_DNS, state->tlsp->sni, sz))) | |
1626 | return tls_error_gnu(US"gnutls_server_name_set", rc, host, errstr); | |
17c76198 PP |
1627 | } |
1628 | } | |
1629 | else if (state->tls_sni) | |
1630 | DEBUG(D_tls) debug_printf("*** PROBABLY A BUG *** " \ | |
ba86e143 | 1631 | "have an SNI set for a server [%s]\n", state->tls_sni); |
83da1223 | 1632 | |
17c76198 | 1633 | /* This is the priority string support, |
42bfef1e | 1634 | http://www.gnutls.org/manual/html_node/Priority-Strings.html |
17c76198 PP |
1635 | and replaces gnutls_require_kx, gnutls_require_mac & gnutls_require_protocols. |
1636 | This was backwards incompatible, but means Exim no longer needs to track | |
1637 | all algorithms and provide string forms for them. */ | |
83da1223 | 1638 | |
fc243e94 | 1639 | p = NULL; |
17c76198 | 1640 | if (state->tls_require_ciphers && *state->tls_require_ciphers) |
83da1223 | 1641 | { |
cf0c6164 | 1642 | if (!expand_check_tlsvar(tls_require_ciphers, errstr)) |
17c76198 PP |
1643 | return DEFER; |
1644 | if (state->exp_tls_require_ciphers && *state->exp_tls_require_ciphers) | |
83da1223 | 1645 | { |
17c76198 | 1646 | p = state->exp_tls_require_ciphers; |
fc243e94 | 1647 | DEBUG(D_tls) debug_printf("GnuTLS session cipher/priority \"%s\"\n", p); |
83da1223 PH |
1648 | } |
1649 | } | |
fc243e94 | 1650 | if (!p) |
17c76198 | 1651 | { |
fc243e94 | 1652 | p = exim_default_gnutls_priority; |
83e2f8a2 | 1653 | DEBUG(D_tls) |
fc243e94 | 1654 | debug_printf("GnuTLS using default session cipher/priority \"%s\"\n", p); |
17c76198 | 1655 | } |
83da1223 | 1656 | |
452a164f JH |
1657 | if ((rc = gnutls_priority_init(&state->priority_cache, CCS p, &errpos))) |
1658 | return tls_error_gnu(string_sprintf( | |
1659 | "gnutls_priority_init(%s) failed at offset %ld, \"%.6s..\"", | |
1660 | p, errpos - CS p, errpos), | |
1661 | rc, host, errstr); | |
17c76198 | 1662 | |
452a164f JH |
1663 | if ((rc = gnutls_priority_set(state->session, state->priority_cache))) |
1664 | return tls_error_gnu(US"gnutls_priority_set", rc, host, errstr); | |
17c76198 | 1665 | |
b10c87b3 JH |
1666 | /* This also sets the server ticket expiration time to the same, and |
1667 | the STEK rotation time to 3x. */ | |
1668 | ||
17c76198 PP |
1669 | gnutls_db_set_cache_expiration(state->session, ssl_session_timeout); |
1670 | ||
1671 | /* Reduce security in favour of increased compatibility, if the admin | |
1672 | decides to make that trade-off. */ | |
1673 | if (gnutls_compat_mode) | |
83da1223 | 1674 | { |
17c76198 PP |
1675 | #if LIBGNUTLS_VERSION_NUMBER >= 0x020104 |
1676 | DEBUG(D_tls) debug_printf("lowering GnuTLS security, compatibility mode\n"); | |
1677 | gnutls_session_enable_compatibility_mode(state->session); | |
1678 | #else | |
1679 | DEBUG(D_tls) debug_printf("Unable to set gnutls_compat_mode - GnuTLS version too old\n"); | |
1680 | #endif | |
83da1223 PH |
1681 | } |
1682 | ||
17c76198 | 1683 | *caller_state = state; |
17c76198 | 1684 | return OK; |
83da1223 PH |
1685 | } |
1686 | ||
1687 | ||
1688 | ||
059ec3d9 | 1689 | /************************************************* |
17c76198 | 1690 | * Extract peer information * |
059ec3d9 PH |
1691 | *************************************************/ |
1692 | ||
f1be21cf JH |
1693 | static const uschar * |
1694 | cipher_stdname_kcm(gnutls_kx_algorithm_t kx, gnutls_cipher_algorithm_t cipher, | |
1695 | gnutls_mac_algorithm_t mac) | |
1696 | { | |
1697 | uschar cs_id[2]; | |
1698 | gnutls_kx_algorithm_t kx_i; | |
1699 | gnutls_cipher_algorithm_t cipher_i; | |
1700 | gnutls_mac_algorithm_t mac_i; | |
1701 | ||
1702 | for (size_t i = 0; | |
1703 | gnutls_cipher_suite_info(i, cs_id, &kx_i, &cipher_i, &mac_i, NULL); | |
1704 | i++) | |
1705 | if (kx_i == kx && cipher_i == cipher && mac_i == mac) | |
1706 | return cipher_stdname(cs_id[0], cs_id[1]); | |
1707 | return NULL; | |
1708 | } | |
1709 | ||
1710 | ||
1711 | ||
17c76198 | 1712 | /* Called from both server and client code. |
4fe99a6c PP |
1713 | Only this is allowed to set state->peerdn and state->have_set_peerdn |
1714 | and we use that to detect double-calls. | |
059ec3d9 | 1715 | |
75fe387d PP |
1716 | NOTE: the state blocks last while the TLS connection is up, which is fine |
1717 | for logging in the server side, but for the client side, we log after teardown | |
1718 | in src/deliver.c. While the session is up, we can twist about states and | |
1719 | repoint tls_* globals, but those variables used for logging or other variable | |
1720 | expansion that happens _after_ delivery need to have a longer life-time. | |
1721 | ||
1722 | So for those, we get the data from POOL_PERM; the re-invoke guard keeps us from | |
1723 | doing this more than once per generation of a state context. We set them in | |
1724 | the state context, and repoint tls_* to them. After the state goes away, the | |
1725 | tls_* copies of the pointers remain valid and client delivery logging is happy. | |
1726 | ||
1727 | tls_certificate_verified is a BOOL, so the tls_peerdn and tls_cipher issues | |
1728 | don't apply. | |
1729 | ||
059ec3d9 | 1730 | Arguments: |
17c76198 | 1731 | state exim_gnutls_state_st * |
cf0c6164 | 1732 | errstr pointer to error string |
059ec3d9 | 1733 | |
17c76198 | 1734 | Returns: OK/DEFER/FAIL |
059ec3d9 PH |
1735 | */ |
1736 | ||
17c76198 | 1737 | static int |
b10c87b3 | 1738 | peer_status(exim_gnutls_state_st * state, uschar ** errstr) |
059ec3d9 | 1739 | { |
b10c87b3 JH |
1740 | gnutls_session_t session = state->session; |
1741 | const gnutls_datum_t * cert_list; | |
75fe387d | 1742 | int old_pool, rc; |
17c76198 | 1743 | unsigned int cert_list_size = 0; |
4fe99a6c PP |
1744 | gnutls_protocol_t protocol; |
1745 | gnutls_cipher_algorithm_t cipher; | |
1746 | gnutls_kx_algorithm_t kx; | |
1747 | gnutls_mac_algorithm_t mac; | |
17c76198 PP |
1748 | gnutls_certificate_type_t ct; |
1749 | gnutls_x509_crt_t crt; | |
b10c87b3 | 1750 | uschar * dn_buf; |
17c76198 | 1751 | size_t sz; |
059ec3d9 | 1752 | |
4fe99a6c | 1753 | if (state->have_set_peerdn) |
17c76198 | 1754 | return OK; |
4fe99a6c | 1755 | state->have_set_peerdn = TRUE; |
059ec3d9 | 1756 | |
4fe99a6c | 1757 | state->peerdn = NULL; |
059ec3d9 | 1758 | |
4fe99a6c | 1759 | /* tls_cipher */ |
b10c87b3 JH |
1760 | cipher = gnutls_cipher_get(session); |
1761 | protocol = gnutls_protocol_get_version(session); | |
1762 | mac = gnutls_mac_get(session); | |
b9c6f63c JH |
1763 | kx = |
1764 | #ifdef GNUTLS_TLS1_3 | |
1765 | protocol >= GNUTLS_TLS1_3 ? 0 : | |
1766 | #endif | |
b10c87b3 | 1767 | gnutls_kx_get(session); |
4fe99a6c | 1768 | |
75fe387d | 1769 | old_pool = store_pool; |
f1be21cf | 1770 | { |
b10c87b3 | 1771 | tls_support * tlsp = state->tlsp; |
f1be21cf | 1772 | store_pool = POOL_PERM; |
d9acfc1c JH |
1773 | |
1774 | #ifdef SUPPORT_GNUTLS_SESS_DESC | |
1775 | { | |
1776 | gstring * g = NULL; | |
b10c87b3 | 1777 | uschar * s = US gnutls_session_get_desc(session), c; |
d9acfc1c JH |
1778 | |
1779 | /* Nikos M suggests we use this by preference. It returns like: | |
1780 | (TLS1.3)-(ECDHE-SECP256R1)-(RSA-PSS-RSAE-SHA256)-(AES-256-GCM) | |
1781 | ||
1782 | For partial back-compat, put a colon after the TLS version, replace the | |
1783 | )-( grouping with __, replace in-group - with _ and append the :keysize. */ | |
1784 | ||
1785 | /* debug_printf("peer_status: gnutls_session_get_desc %s\n", s); */ | |
1786 | ||
1787 | for (s++; (c = *s) && c != ')'; s++) g = string_catn(g, s, 1); | |
da40b1ec JH |
1788 | |
1789 | tlsp->ver = string_copyn(g->s, g->ptr); | |
1790 | for (uschar * p = US tlsp->ver; *p; p++) | |
1791 | if (*p == '-') { *p = '\0'; break; } /* TLS1.0-PKIX -> TLS1.0 */ | |
1792 | ||
d9acfc1c JH |
1793 | g = string_catn(g, US":", 1); |
1794 | if (*s) s++; /* now on _ between groups */ | |
1795 | while ((c = *s)) | |
1796 | { | |
da40b1ec JH |
1797 | for (*++s && ++s; (c = *s) && c != ')'; s++) |
1798 | g = string_catn(g, c == '-' ? US"_" : s, 1); | |
d9acfc1c JH |
1799 | /* now on ) closing group */ |
1800 | if ((c = *s) && *++s == '-') g = string_catn(g, US"__", 2); | |
1801 | /* now on _ between groups */ | |
1802 | } | |
1803 | g = string_catn(g, US":", 1); | |
1804 | g = string_cat(g, string_sprintf("%d", (int) gnutls_cipher_get_key_size(cipher) * 8)); | |
1805 | state->ciphersuite = string_from_gstring(g); | |
1806 | } | |
1807 | #else | |
f1be21cf JH |
1808 | state->ciphersuite = string_sprintf("%s:%s:%d", |
1809 | gnutls_protocol_get_name(protocol), | |
1810 | gnutls_cipher_suite_get_name(kx, cipher, mac), | |
1811 | (int) gnutls_cipher_get_key_size(cipher) * 8); | |
1812 | ||
1813 | /* I don't see a way that spaces could occur, in the current GnuTLS | |
1814 | code base, but it was a concern in the old code and perhaps older GnuTLS | |
1815 | releases did return "TLS 1.0"; play it safe, just in case. */ | |
1816 | ||
1817 | for (uschar * p = state->ciphersuite; *p; p++) if (isspace(*p)) *p = '-'; | |
da40b1ec JH |
1818 | tlsp->ver = string_copyn(state->ciphersuite, |
1819 | Ustrchr(state->ciphersuite, ':') - state->ciphersuite); | |
d9acfc1c JH |
1820 | #endif |
1821 | ||
1822 | /* debug_printf("peer_status: ciphersuite %s\n", state->ciphersuite); */ | |
1823 | ||
b10c87b3 JH |
1824 | tlsp->cipher = state->ciphersuite; |
1825 | tlsp->bits = gnutls_cipher_get_key_size(cipher) * 8; | |
f1be21cf | 1826 | |
b10c87b3 | 1827 | tlsp->cipher_stdname = cipher_stdname_kcm(kx, cipher, mac); |
f1be21cf | 1828 | } |
75fe387d | 1829 | store_pool = old_pool; |
4fe99a6c PP |
1830 | |
1831 | /* tls_peerdn */ | |
b10c87b3 | 1832 | cert_list = gnutls_certificate_get_peers(session, &cert_list_size); |
83da1223 | 1833 | |
f1be21cf | 1834 | if (!cert_list || cert_list_size == 0) |
17c76198 | 1835 | { |
17c76198 PP |
1836 | DEBUG(D_tls) debug_printf("TLS: no certificate from peer (%p & %d)\n", |
1837 | cert_list, cert_list_size); | |
e51c7be2 | 1838 | if (state->verify_requirement >= VERIFY_REQUIRED) |
17c76198 | 1839 | return tls_error(US"certificate verification failed", |
48224640 | 1840 | US"no certificate received from peer", state->host, errstr); |
17c76198 PP |
1841 | return OK; |
1842 | } | |
059ec3d9 | 1843 | |
b10c87b3 | 1844 | if ((ct = gnutls_certificate_type_get(session)) != GNUTLS_CRT_X509) |
059ec3d9 | 1845 | { |
95f52235 | 1846 | const uschar * ctn = US gnutls_certificate_type_get_name(ct); |
17c76198 PP |
1847 | DEBUG(D_tls) |
1848 | debug_printf("TLS: peer cert not X.509 but instead \"%s\"\n", ctn); | |
e51c7be2 | 1849 | if (state->verify_requirement >= VERIFY_REQUIRED) |
17c76198 | 1850 | return tls_error(US"certificate verification not possible, unhandled type", |
cf0c6164 | 1851 | ctn, state->host, errstr); |
17c76198 | 1852 | return OK; |
83da1223 | 1853 | } |
059ec3d9 | 1854 | |
e51c7be2 JH |
1855 | #define exim_gnutls_peer_err(Label) \ |
1856 | do { \ | |
1857 | if (rc != GNUTLS_E_SUCCESS) \ | |
1858 | { \ | |
1859 | DEBUG(D_tls) debug_printf("TLS: peer cert problem: %s: %s\n", \ | |
1860 | (Label), gnutls_strerror(rc)); \ | |
1861 | if (state->verify_requirement >= VERIFY_REQUIRED) \ | |
452a164f | 1862 | return tls_error_gnu((Label), rc, state->host, errstr); \ |
e51c7be2 JH |
1863 | return OK; \ |
1864 | } \ | |
1865 | } while (0) | |
17c76198 | 1866 | |
9d1c15ef JH |
1867 | rc = import_cert(&cert_list[0], &crt); |
1868 | exim_gnutls_peer_err(US"cert 0"); | |
1869 | ||
1870 | state->tlsp->peercert = state->peercert = crt; | |
17c76198 | 1871 | |
17c76198 PP |
1872 | sz = 0; |
1873 | rc = gnutls_x509_crt_get_dn(crt, NULL, &sz); | |
1874 | if (rc != GNUTLS_E_SHORT_MEMORY_BUFFER) | |
83da1223 | 1875 | { |
17c76198 PP |
1876 | exim_gnutls_peer_err(US"getting size for cert DN failed"); |
1877 | return FAIL; /* should not happen */ | |
059ec3d9 | 1878 | } |
f3ebb786 | 1879 | dn_buf = store_get_perm(sz, TRUE); /* tainted */ |
17c76198 PP |
1880 | rc = gnutls_x509_crt_get_dn(crt, CS dn_buf, &sz); |
1881 | exim_gnutls_peer_err(US"failed to extract certificate DN [gnutls_x509_crt_get_dn(cert 0)]"); | |
9d1c15ef | 1882 | |
17c76198 PP |
1883 | state->peerdn = dn_buf; |
1884 | ||
1885 | return OK; | |
1886 | #undef exim_gnutls_peer_err | |
1887 | } | |
059ec3d9 | 1888 | |
059ec3d9 | 1889 | |
059ec3d9 | 1890 | |
059ec3d9 | 1891 | |
17c76198 PP |
1892 | /************************************************* |
1893 | * Verify peer certificate * | |
1894 | *************************************************/ | |
059ec3d9 | 1895 | |
17c76198 PP |
1896 | /* Called from both server and client code. |
1897 | *Should* be using a callback registered with | |
1898 | gnutls_certificate_set_verify_function() to fail the handshake if we dislike | |
1899 | the peer information, but that's too new for some OSes. | |
059ec3d9 | 1900 | |
17c76198 | 1901 | Arguments: |
899b8bbc JH |
1902 | state exim_gnutls_state_st * |
1903 | errstr where to put an error message | |
059ec3d9 | 1904 | |
17c76198 PP |
1905 | Returns: |
1906 | FALSE if the session should be rejected | |
1907 | TRUE if the cert is okay or we just don't care | |
1908 | */ | |
059ec3d9 | 1909 | |
17c76198 | 1910 | static BOOL |
28646fa9 | 1911 | verify_certificate(exim_gnutls_state_st * state, uschar ** errstr) |
17c76198 PP |
1912 | { |
1913 | int rc; | |
899b8bbc JH |
1914 | uint verify; |
1915 | ||
8008accd | 1916 | DEBUG(D_tls) debug_printf("TLS: checking peer certificate\n"); |
cf0c6164 | 1917 | *errstr = NULL; |
b10c87b3 | 1918 | rc = peer_status(state, errstr); |
17c76198 | 1919 | |
b10c87b3 JH |
1920 | if (state->verify_requirement == VERIFY_NONE) |
1921 | return TRUE; | |
1922 | ||
1923 | if (rc != OK || !state->peerdn) | |
e6060e2c | 1924 | { |
17c76198 | 1925 | verify = GNUTLS_CERT_INVALID; |
cf0c6164 | 1926 | *errstr = US"certificate not supplied"; |
17c76198 PP |
1927 | } |
1928 | else | |
899b8bbc JH |
1929 | |
1930 | { | |
1931 | #ifdef SUPPORT_DANE | |
1932 | if (state->verify_requirement == VERIFY_DANE && state->host) | |
1933 | { | |
1934 | /* Using dane_verify_session_crt() would be easy, as it does it all for us | |
1935 | including talking to a DNS resolver. But we want to do that bit ourselves | |
1936 | as the testsuite intercepts and fakes its own DNS environment. */ | |
1937 | ||
1938 | dane_state_t s; | |
1939 | dane_query_t r; | |
899b8bbc | 1940 | uint lsize; |
94c13285 JH |
1941 | const gnutls_datum_t * certlist = |
1942 | gnutls_certificate_get_peers(state->session, &lsize); | |
1943 | int usage = tls_out.tlsa_usage; | |
1944 | ||
1945 | # ifdef GNUTLS_BROKEN_DANE_VALIDATION | |
1946 | /* Split the TLSA records into two sets, TA and EE selectors. Run the | |
1947 | dane-verification separately so that we know which selector verified; | |
570cb1bd | 1948 | then we know whether to do name-verification (needed for TA but not EE). */ |
94c13285 JH |
1949 | |
1950 | if (usage == ((1<<DANESSL_USAGE_DANE_TA) | (1<<DANESSL_USAGE_DANE_EE))) | |
bd5b3f3c | 1951 | { /* a mixed-usage bundle */ |
94c13285 JH |
1952 | int i, j, nrec; |
1953 | const char ** dd; | |
1954 | int * ddl; | |
1955 | ||
3d2e82c5 | 1956 | for (nrec = 0; state->dane_data_len[nrec]; ) nrec++; |
94c13285 JH |
1957 | nrec++; |
1958 | ||
f3ebb786 JH |
1959 | dd = store_get(nrec * sizeof(uschar *), FALSE); |
1960 | ddl = store_get(nrec * sizeof(int), FALSE); | |
94c13285 JH |
1961 | nrec--; |
1962 | ||
1963 | if ((rc = dane_state_init(&s, 0))) | |
1964 | goto tlsa_prob; | |
1965 | ||
1966 | for (usage = DANESSL_USAGE_DANE_EE; | |
1967 | usage >= DANESSL_USAGE_DANE_TA; usage--) | |
1968 | { /* take records with this usage */ | |
1969 | for (j = i = 0; i < nrec; i++) | |
1970 | if (state->dane_data[i][0] == usage) | |
1971 | { | |
1972 | dd[j] = state->dane_data[i]; | |
1973 | ddl[j++] = state->dane_data_len[i]; | |
1974 | } | |
1975 | if (j) | |
1976 | { | |
1977 | dd[j] = NULL; | |
1978 | ddl[j] = 0; | |
1979 | ||
1980 | if ((rc = dane_raw_tlsa(s, &r, (char * const *)dd, ddl, 1, 0))) | |
1981 | goto tlsa_prob; | |
1982 | ||
1983 | if ((rc = dane_verify_crt_raw(s, certlist, lsize, | |
1984 | gnutls_certificate_type_get(state->session), | |
1985 | r, 0, | |
1986 | usage == DANESSL_USAGE_DANE_EE | |
1987 | ? DANE_VFLAG_ONLY_CHECK_EE_USAGE : 0, | |
1988 | &verify))) | |
1989 | { | |
1990 | DEBUG(D_tls) | |
1991 | debug_printf("TLSA record problem: %s\n", dane_strerror(rc)); | |
1992 | } | |
1993 | else if (verify == 0) /* verification passed */ | |
1994 | { | |
1995 | usage = 1 << usage; | |
1996 | break; | |
1997 | } | |
1998 | } | |
1999 | } | |
899b8bbc | 2000 | |
94c13285 JH |
2001 | if (rc) goto tlsa_prob; |
2002 | } | |
2003 | else | |
2004 | # endif | |
899b8bbc | 2005 | { |
94c13285 JH |
2006 | if ( (rc = dane_state_init(&s, 0)) |
2007 | || (rc = dane_raw_tlsa(s, &r, state->dane_data, state->dane_data_len, | |
2008 | 1, 0)) | |
2009 | || (rc = dane_verify_crt_raw(s, certlist, lsize, | |
2010 | gnutls_certificate_type_get(state->session), | |
5ec37a55 | 2011 | r, 0, |
94c13285 JH |
2012 | # ifdef GNUTLS_BROKEN_DANE_VALIDATION |
2013 | usage == (1 << DANESSL_USAGE_DANE_EE) | |
2014 | ? DANE_VFLAG_ONLY_CHECK_EE_USAGE : 0, | |
2015 | # else | |
2016 | 0, | |
2017 | # endif | |
2018 | &verify)) | |
2019 | ) | |
2020 | goto tlsa_prob; | |
899b8bbc | 2021 | } |
94c13285 JH |
2022 | |
2023 | if (verify != 0) /* verification failed */ | |
899b8bbc JH |
2024 | { |
2025 | gnutls_datum_t str; | |
2026 | (void) dane_verification_status_print(verify, &str, 0); | |
2027 | *errstr = US str.data; /* don't bother to free */ | |
2028 | goto badcert; | |
2029 | } | |
28646fa9 | 2030 | |
94c13285 JH |
2031 | # ifdef GNUTLS_BROKEN_DANE_VALIDATION |
2032 | /* If a TA-mode TLSA record was used for verification we must additionally | |
570cb1bd | 2033 | verify the cert name (but not the CA chain). For EE-mode, skip it. */ |
28646fa9 | 2034 | |
94c13285 JH |
2035 | if (usage & (1 << DANESSL_USAGE_DANE_EE)) |
2036 | # endif | |
28646fa9 | 2037 | { |
570cb1bd | 2038 | state->peer_dane_verified = state->peer_cert_verified = TRUE; |
28646fa9 JH |
2039 | goto goodcert; |
2040 | } | |
570cb1bd JH |
2041 | # ifdef GNUTLS_BROKEN_DANE_VALIDATION |
2042 | /* Assume that the name on the A-record is the one that should be matching | |
2043 | the cert. An alternate view is that the domain part of the email address | |
2044 | is also permissible. */ | |
2045 | ||
2046 | if (gnutls_x509_crt_check_hostname(state->tlsp->peercert, | |
2047 | CS state->host->name)) | |
2048 | { | |
2049 | state->peer_dane_verified = state->peer_cert_verified = TRUE; | |
2050 | goto goodcert; | |
2051 | } | |
2052 | # endif | |
899b8bbc | 2053 | } |
570cb1bd | 2054 | #endif /*SUPPORT_DANE*/ |
899b8bbc | 2055 | |
17c76198 | 2056 | rc = gnutls_certificate_verify_peers2(state->session, &verify); |
899b8bbc | 2057 | } |
e6060e2c | 2058 | |
899b8bbc | 2059 | /* Handle the result of verification. INVALID is set if any others are. */ |
059ec3d9 | 2060 | |
28646fa9 | 2061 | if (rc < 0 || verify & (GNUTLS_CERT_INVALID|GNUTLS_CERT_REVOKED)) |
17c76198 PP |
2062 | { |
2063 | state->peer_cert_verified = FALSE; | |
cf0c6164 | 2064 | if (!*errstr) |
184384c3 JH |
2065 | { |
2066 | #ifdef GNUTLS_CERT_VFY_STATUS_PRINT | |
2067 | DEBUG(D_tls) | |
2068 | { | |
2069 | gnutls_datum_t txt; | |
2070 | ||
2071 | if (gnutls_certificate_verification_status_print(verify, | |
2072 | gnutls_certificate_type_get(state->session), &txt, 0) | |
2073 | == GNUTLS_E_SUCCESS) | |
2074 | { | |
2075 | debug_printf("%s\n", txt.data); | |
2076 | gnutls_free(txt.data); | |
2077 | } | |
2078 | } | |
2079 | #endif | |
cf0c6164 JH |
2080 | *errstr = verify & GNUTLS_CERT_REVOKED |
2081 | ? US"certificate revoked" : US"certificate invalid"; | |
184384c3 | 2082 | } |
059ec3d9 | 2083 | |
17c76198 | 2084 | DEBUG(D_tls) |
e51c7be2 | 2085 | debug_printf("TLS certificate verification failed (%s): peerdn=\"%s\"\n", |
cf0c6164 | 2086 | *errstr, state->peerdn ? state->peerdn : US"<unset>"); |
059ec3d9 | 2087 | |
e51c7be2 | 2088 | if (state->verify_requirement >= VERIFY_REQUIRED) |
899b8bbc | 2089 | goto badcert; |
17c76198 | 2090 | DEBUG(D_tls) |
4789da3a | 2091 | debug_printf("TLS verify failure overridden (host in tls_try_verify_hosts)\n"); |
17c76198 | 2092 | } |
e51c7be2 | 2093 | |
17c76198 PP |
2094 | else |
2095 | { | |
5fd28bb8 JH |
2096 | /* Client side, check the server's certificate name versus the name on the |
2097 | A-record for the connection we made. What to do for server side - what name | |
2098 | to use for client? We document that there is no such checking for server | |
2099 | side. */ | |
2100 | ||
2101 | if ( state->exp_tls_verify_cert_hostnames | |
2102 | && !gnutls_x509_crt_check_hostname(state->tlsp->peercert, | |
2103 | CS state->exp_tls_verify_cert_hostnames) | |
2104 | ) | |
e51c7be2 | 2105 | { |
5fd28bb8 JH |
2106 | DEBUG(D_tls) |
2107 | debug_printf("TLS certificate verification failed: cert name mismatch\n"); | |
2108 | if (state->verify_requirement >= VERIFY_REQUIRED) | |
2109 | goto badcert; | |
2110 | return TRUE; | |
e51c7be2 | 2111 | } |
5fd28bb8 | 2112 | |
17c76198 | 2113 | state->peer_cert_verified = TRUE; |
e51c7be2 | 2114 | DEBUG(D_tls) debug_printf("TLS certificate verified: peerdn=\"%s\"\n", |
4fe99a6c | 2115 | state->peerdn ? state->peerdn : US"<unset>"); |
17c76198 | 2116 | } |
059ec3d9 | 2117 | |
28646fa9 JH |
2118 | goodcert: |
2119 | state->tlsp->peerdn = state->peerdn; | |
2120 | return TRUE; | |
899b8bbc | 2121 | |
b83314e3 | 2122 | #ifdef SUPPORT_DANE |
94c13285 | 2123 | tlsa_prob: |
624f33df JH |
2124 | *errstr = string_sprintf("TLSA record problem: %s", |
2125 | rc == DANE_E_REQUESTED_DATA_NOT_AVAILABLE ? "none usable" : dane_strerror(rc)); | |
b83314e3 JH |
2126 | #endif |
2127 | ||
899b8bbc JH |
2128 | badcert: |
2129 | gnutls_alert_send(state->session, GNUTLS_AL_FATAL, GNUTLS_A_BAD_CERTIFICATE); | |
2130 | return FALSE; | |
17c76198 | 2131 | } |
059ec3d9 | 2132 | |
17c76198 PP |
2133 | |
2134 | ||
2135 | ||
2136 | /* ------------------------------------------------------------------------ */ | |
2137 | /* Callbacks */ | |
2138 | ||
2139 | /* Logging function which can be registered with | |
2140 | * gnutls_global_set_log_function() | |
2141 | * gnutls_global_set_log_level() 0..9 | |
2142 | */ | |
af3498d6 | 2143 | #if EXIM_GNUTLS_LIBRARY_LOG_LEVEL >= 0 |
059ec3d9 | 2144 | static void |
17c76198 | 2145 | exim_gnutls_logger_cb(int level, const char *message) |
059ec3d9 | 2146 | { |
8c79eebf PP |
2147 | size_t len = strlen(message); |
2148 | if (len < 1) | |
2149 | { | |
2150 | DEBUG(D_tls) debug_printf("GnuTLS<%d> empty debug message\n", level); | |
2151 | return; | |
2152 | } | |
2153 | DEBUG(D_tls) debug_printf("GnuTLS<%d>: %s%s", level, message, | |
2154 | message[len-1] == '\n' ? "" : "\n"); | |
17c76198 | 2155 | } |
af3498d6 | 2156 | #endif |
059ec3d9 | 2157 | |
059ec3d9 | 2158 | |
17c76198 PP |
2159 | /* Called after client hello, should handle SNI work. |
2160 | This will always set tls_sni (state->received_sni) if available, | |
2161 | and may trigger presenting different certificates, | |
2162 | if state->trigger_sni_changes is TRUE. | |
059ec3d9 | 2163 | |
17c76198 PP |
2164 | Should be registered with |
2165 | gnutls_handshake_set_post_client_hello_function() | |
059ec3d9 | 2166 | |
17c76198 PP |
2167 | "This callback must return 0 on success or a gnutls error code to terminate the |
2168 | handshake.". | |
059ec3d9 | 2169 | |
17c76198 PP |
2170 | For inability to get SNI information, we return 0. |
2171 | We only return non-zero if re-setup failed. | |
817d9f57 | 2172 | Only used for server-side TLS. |
17c76198 | 2173 | */ |
44bbabb5 | 2174 | |
17c76198 PP |
2175 | static int |
2176 | exim_sni_handling_cb(gnutls_session_t session) | |
2177 | { | |
2178 | char sni_name[MAX_HOST_LEN]; | |
2179 | size_t data_len = MAX_HOST_LEN; | |
817d9f57 | 2180 | exim_gnutls_state_st *state = &state_server; |
17c76198 PP |
2181 | unsigned int sni_type; |
2182 | int rc, old_pool; | |
cf0c6164 | 2183 | uschar * dummy_errstr; |
17c76198 PP |
2184 | |
2185 | rc = gnutls_server_name_get(session, sni_name, &data_len, &sni_type, 0); | |
b34fc30c PP |
2186 | if (rc != GNUTLS_E_SUCCESS) |
2187 | { | |
8775d84f | 2188 | DEBUG(D_tls) |
b34fc30c PP |
2189 | if (rc == GNUTLS_E_REQUESTED_DATA_NOT_AVAILABLE) |
2190 | debug_printf("TLS: no SNI presented in handshake.\n"); | |
2191 | else | |
2192 | debug_printf("TLS failure: gnutls_server_name_get(): %s [%d]\n", | |
2193 | gnutls_strerror(rc), rc); | |
b34fc30c PP |
2194 | return 0; |
2195 | } | |
2196 | ||
17c76198 PP |
2197 | if (sni_type != GNUTLS_NAME_DNS) |
2198 | { | |
2199 | DEBUG(D_tls) debug_printf("TLS: ignoring SNI of unhandled type %u\n", sni_type); | |
2200 | return 0; | |
2201 | } | |
44bbabb5 | 2202 | |
17c76198 PP |
2203 | /* We now have a UTF-8 string in sni_name */ |
2204 | old_pool = store_pool; | |
2205 | store_pool = POOL_PERM; | |
89a80675 | 2206 | state->received_sni = string_copy_taint(US sni_name, TRUE); |
17c76198 PP |
2207 | store_pool = old_pool; |
2208 | ||
2209 | /* We set this one now so that variable expansions below will work */ | |
817d9f57 | 2210 | state->tlsp->sni = state->received_sni; |
17c76198 PP |
2211 | |
2212 | DEBUG(D_tls) debug_printf("Received TLS SNI \"%s\"%s\n", sni_name, | |
2213 | state->trigger_sni_changes ? "" : " (unused for certificate selection)"); | |
2214 | ||
2215 | if (!state->trigger_sni_changes) | |
2216 | return 0; | |
2217 | ||
cf0c6164 | 2218 | if ((rc = tls_expand_session_files(state, &dummy_errstr)) != OK) |
17c76198 PP |
2219 | { |
2220 | /* If the setup of certs/etc failed before handshake, TLS would not have | |
2221 | been offered. The best we can do now is abort. */ | |
2222 | return GNUTLS_E_APPLICATION_ERROR_MIN; | |
2223 | } | |
2224 | ||
cf0c6164 | 2225 | rc = tls_set_remaining_x509(state, &dummy_errstr); |
1365611d PP |
2226 | if (rc != OK) return GNUTLS_E_APPLICATION_ERROR_MIN; |
2227 | ||
2228 | return 0; | |
059ec3d9 PH |
2229 | } |
2230 | ||
2231 | ||
2232 | ||
0cbf2b82 | 2233 | #ifndef DISABLE_EVENT |
a7538db1 JH |
2234 | /* |
2235 | We use this callback to get observability and detail-level control | |
723fe533 JH |
2236 | for an exim TLS connection (either direction), raising a tls:cert event |
2237 | for each cert in the chain presented by the peer. Any event | |
a7538db1 JH |
2238 | can deny verification. |
2239 | ||
2240 | Return 0 for the handshake to continue or non-zero to terminate. | |
2241 | */ | |
2242 | ||
2243 | static int | |
723fe533 | 2244 | verify_cb(gnutls_session_t session) |
a7538db1 | 2245 | { |
27f19eb4 | 2246 | const gnutls_datum_t * cert_list; |
a7538db1 JH |
2247 | unsigned int cert_list_size = 0; |
2248 | gnutls_x509_crt_t crt; | |
2249 | int rc; | |
b30275b8 | 2250 | uschar * yield; |
a7538db1 JH |
2251 | exim_gnutls_state_st * state = gnutls_session_get_ptr(session); |
2252 | ||
bd5b3f3c | 2253 | if ((cert_list = gnutls_certificate_get_peers(session, &cert_list_size))) |
a7538db1 JH |
2254 | while (cert_list_size--) |
2255 | { | |
bd5b3f3c | 2256 | if ((rc = import_cert(&cert_list[cert_list_size], &crt)) != GNUTLS_E_SUCCESS) |
a7538db1 JH |
2257 | { |
2258 | DEBUG(D_tls) debug_printf("TLS: peer cert problem: depth %d: %s\n", | |
2259 | cert_list_size, gnutls_strerror(rc)); | |
2260 | break; | |
2261 | } | |
2262 | ||
2263 | state->tlsp->peercert = crt; | |
b30275b8 JH |
2264 | if ((yield = event_raise(state->event_action, |
2265 | US"tls:cert", string_sprintf("%d", cert_list_size)))) | |
a7538db1 JH |
2266 | { |
2267 | log_write(0, LOG_MAIN, | |
b30275b8 JH |
2268 | "SSL verify denied by event-action: depth=%d: %s", |
2269 | cert_list_size, yield); | |
a7538db1 JH |
2270 | return 1; /* reject */ |
2271 | } | |
2272 | state->tlsp->peercert = NULL; | |
2273 | } | |
2274 | ||
2275 | return 0; | |
2276 | } | |
2277 | ||
2278 | #endif | |
44662487 JH |
2279 | |
2280 | ||
f20cfa4a JH |
2281 | static gstring * |
2282 | ddump(gnutls_datum_t * d) | |
2283 | { | |
2284 | gstring * g = string_get((d->size+1) * 2); | |
2285 | uschar * s = d->data; | |
2286 | for (unsigned i = d->size; i > 0; i--, s++) | |
2287 | { | |
2288 | g = string_catn(g, US "0123456789abcdef" + (*s >> 4), 1); | |
2289 | g = string_catn(g, US "0123456789abcdef" + (*s & 0xf), 1); | |
2290 | } | |
2291 | return g; | |
2292 | } | |
17c76198 | 2293 | |
dc6d1769 JH |
2294 | static void |
2295 | post_handshake_debug(exim_gnutls_state_st * state) | |
2296 | { | |
dc6d1769 JH |
2297 | #ifdef SUPPORT_GNUTLS_SESS_DESC |
2298 | debug_printf("%s\n", gnutls_session_get_desc(state->session)); | |
2299 | #endif | |
e326959e | 2300 | |
86ede124 | 2301 | #ifdef SUPPORT_GNUTLS_KEYLOG |
e326959e | 2302 | # ifdef EXIM_HAVE_TLS1_3 |
dc6d1769 | 2303 | if (gnutls_protocol_get_version(state->session) < GNUTLS_TLS1_3) |
86ede124 | 2304 | # else |
a8af957d | 2305 | if (TRUE) |
86ede124 | 2306 | # endif |
dc6d1769 JH |
2307 | { |
2308 | gnutls_datum_t c, s; | |
2309 | gstring * gc, * gs; | |
86ede124 | 2310 | /* For TLS1.2 we only want the client random and the master secret */ |
dc6d1769 JH |
2311 | gnutls_session_get_random(state->session, &c, &s); |
2312 | gnutls_session_get_master_secret(state->session, &s); | |
2313 | gc = ddump(&c); | |
2314 | gs = ddump(&s); | |
2315 | debug_printf("CLIENT_RANDOM %.*s %.*s\n", (int)gc->ptr, gc->s, (int)gs->ptr, gs->s); | |
2316 | } | |
2317 | else | |
2318 | debug_printf("To get keying info for TLS1.3 is hard:\n" | |
7832b9aa HSHR |
2319 | " Set environment variable SSLKEYLOGFILE to a filename relative to the spool directory,\n" |
2320 | " and make sure it is writable by the Exim runtime user.\n" | |
2321 | " Add SSLKEYLOGFILE to keep_environment in the exim config.\n" | |
2322 | " Start Exim as root.\n" | |
2323 | " If using sudo, add SSLKEYLOGFILE to env_keep in /etc/sudoers\n" | |
2324 | " (works for TLS1.2 also, and saves cut-paste into file).\n" | |
86ede124 | 2325 | " Trying to use add_environment for this will not work\n"); |
dc6d1769 JH |
2326 | #endif |
2327 | } | |
2328 | ||
b10c87b3 JH |
2329 | |
2330 | #ifdef EXPERIMENTAL_TLS_RESUME | |
2331 | static int | |
2332 | tls_server_ticket_cb(gnutls_session_t sess, u_int htype, unsigned when, | |
2333 | unsigned incoming, const gnutls_datum_t * msg) | |
2334 | { | |
2335 | DEBUG(D_tls) debug_printf("newticket cb\n"); | |
2336 | tls_in.resumption |= RESUME_CLIENT_REQUESTED; | |
2337 | return 0; | |
2338 | } | |
2339 | ||
2340 | static void | |
2341 | tls_server_resume_prehandshake(exim_gnutls_state_st * state) | |
2342 | { | |
2343 | /* Should the server offer session resumption? */ | |
2344 | tls_in.resumption = RESUME_SUPPORTED; | |
2345 | if (verify_check_host(&tls_resumption_hosts) == OK) | |
2346 | { | |
2347 | int rc; | |
2348 | /* GnuTLS appears to not do ticket overlap, but does emit a fresh ticket when | |
2349 | an offered resumption is unacceptable. We lose one resumption per ticket | |
2350 | lifetime, and sessions cannot be indefinitely re-used. There seems to be no | |
2351 | way (3.6.7) of changing the default number of 2 TLS1.3 tickets issued, but at | |
2352 | least they go out in a single packet. */ | |
2353 | ||
2354 | if (!(rc = gnutls_session_ticket_enable_server(state->session, | |
2355 | &server_sessticket_key))) | |
2356 | tls_in.resumption |= RESUME_SERVER_TICKET; | |
2357 | else | |
2358 | DEBUG(D_tls) | |
2359 | debug_printf("enabling session tickets: %s\n", US gnutls_strerror(rc)); | |
2360 | ||
2361 | /* Try to tell if we see a ticket request */ | |
2362 | gnutls_handshake_set_hook_function(state->session, | |
e5489333 | 2363 | GNUTLS_HANDSHAKE_ANY, GNUTLS_HOOK_POST, tls_server_hook_cb); |
b10c87b3 JH |
2364 | } |
2365 | } | |
2366 | ||
2367 | static void | |
2368 | tls_server_resume_posthandshake(exim_gnutls_state_st * state) | |
2369 | { | |
2370 | if (gnutls_session_resumption_requested(state->session)) | |
2371 | { | |
2372 | /* This tells us the client sent a full ticket. We use a | |
2373 | callback on session-ticket request, elsewhere, to tell | |
2374 | if a client asked for a ticket. */ | |
2375 | ||
2376 | tls_in.resumption |= RESUME_CLIENT_SUGGESTED; | |
2377 | DEBUG(D_tls) debug_printf("client requested resumption\n"); | |
2378 | } | |
2379 | if (gnutls_session_is_resumed(state->session)) | |
2380 | { | |
2381 | tls_in.resumption |= RESUME_USED; | |
2382 | DEBUG(D_tls) debug_printf("Session resumed\n"); | |
2383 | } | |
2384 | } | |
2385 | #endif | |
17c76198 PP |
2386 | /* ------------------------------------------------------------------------ */ |
2387 | /* Exported functions */ | |
2388 | ||
2389 | ||
2390 | ||
2391 | ||
059ec3d9 PH |
2392 | /************************************************* |
2393 | * Start a TLS session in a server * | |
2394 | *************************************************/ | |
2395 | ||
2396 | /* This is called when Exim is running as a server, after having received | |
2397 | the STARTTLS command. It must respond to that command, and then negotiate | |
2398 | a TLS session. | |
2399 | ||
2400 | Arguments: | |
83da1223 | 2401 | require_ciphers list of allowed ciphers or NULL |
cf0c6164 | 2402 | errstr pointer to error string |
059ec3d9 PH |
2403 | |
2404 | Returns: OK on success | |
2405 | DEFER for errors before the start of the negotiation | |
4c04137d | 2406 | FAIL for errors during the negotiation; the server can't |
059ec3d9 PH |
2407 | continue running. |
2408 | */ | |
2409 | ||
2410 | int | |
cf0c6164 | 2411 | tls_server_start(const uschar * require_ciphers, uschar ** errstr) |
059ec3d9 PH |
2412 | { |
2413 | int rc; | |
cf0c6164 | 2414 | exim_gnutls_state_st * state = NULL; |
059ec3d9 PH |
2415 | |
2416 | /* Check for previous activation */ | |
74f1a423 | 2417 | if (tls_in.active.sock >= 0) |
059ec3d9 | 2418 | { |
48224640 | 2419 | tls_error(US"STARTTLS received after TLS started", US "", NULL, errstr); |
925ac8e4 | 2420 | smtp_printf("554 Already in TLS\r\n", FALSE); |
059ec3d9 PH |
2421 | return FAIL; |
2422 | } | |
2423 | ||
2424 | /* Initialize the library. If it fails, it will already have logged the error | |
2425 | and sent an SMTP response. */ | |
2426 | ||
17c76198 | 2427 | DEBUG(D_tls) debug_printf("initialising GnuTLS as a server\n"); |
059ec3d9 | 2428 | |
d85cdeb5 JH |
2429 | { |
2430 | #ifdef MEASURE_TIMING | |
2431 | struct timeval t0; | |
2432 | gettimeofday(&t0, NULL); | |
2433 | #endif | |
2434 | ||
2435 | if ((rc = tls_init(NULL, tls_certificate, tls_privatekey, | |
2436 | NULL, tls_verify_certificates, tls_crl, | |
2437 | require_ciphers, &state, &tls_in, errstr)) != OK) return rc; | |
2438 | ||
2439 | #ifdef MEASURE_TIMING | |
2440 | report_time_since(&t0, US"server tls_init (delta)"); | |
2441 | #endif | |
2442 | } | |
059ec3d9 | 2443 | |
b10c87b3 JH |
2444 | #ifdef EXPERIMENTAL_TLS_RESUME |
2445 | tls_server_resume_prehandshake(state); | |
2446 | #endif | |
2447 | ||
059ec3d9 PH |
2448 | /* If this is a host for which certificate verification is mandatory or |
2449 | optional, set up appropriately. */ | |
2450 | ||
059ec3d9 | 2451 | if (verify_check_host(&tls_verify_hosts) == OK) |
17c76198 | 2452 | { |
e51c7be2 JH |
2453 | DEBUG(D_tls) |
2454 | debug_printf("TLS: a client certificate will be required.\n"); | |
17c76198 PP |
2455 | state->verify_requirement = VERIFY_REQUIRED; |
2456 | gnutls_certificate_server_set_request(state->session, GNUTLS_CERT_REQUIRE); | |
2457 | } | |
059ec3d9 | 2458 | else if (verify_check_host(&tls_try_verify_hosts) == OK) |
17c76198 | 2459 | { |
e51c7be2 JH |
2460 | DEBUG(D_tls) |
2461 | debug_printf("TLS: a client certificate will be requested but not required.\n"); | |
17c76198 PP |
2462 | state->verify_requirement = VERIFY_OPTIONAL; |
2463 | gnutls_certificate_server_set_request(state->session, GNUTLS_CERT_REQUEST); | |
2464 | } | |
2465 | else | |
2466 | { | |
e51c7be2 JH |
2467 | DEBUG(D_tls) |
2468 | debug_printf("TLS: a client certificate will not be requested.\n"); | |
17c76198 PP |
2469 | state->verify_requirement = VERIFY_NONE; |
2470 | gnutls_certificate_server_set_request(state->session, GNUTLS_CERT_IGNORE); | |
2471 | } | |
059ec3d9 | 2472 | |
0cbf2b82 | 2473 | #ifndef DISABLE_EVENT |
723fe533 JH |
2474 | if (event_action) |
2475 | { | |
2476 | state->event_action = event_action; | |
2477 | gnutls_session_set_ptr(state->session, state); | |
2478 | gnutls_certificate_set_verify_function(state->x509_cred, verify_cb); | |
2479 | } | |
2480 | #endif | |
2481 | ||
17c76198 PP |
2482 | /* Register SNI handling; always, even if not in tls_certificate, so that the |
2483 | expansion variable $tls_sni is always available. */ | |
059ec3d9 | 2484 | |
17c76198 PP |
2485 | gnutls_handshake_set_post_client_hello_function(state->session, |
2486 | exim_sni_handling_cb); | |
059ec3d9 PH |
2487 | |
2488 | /* Set context and tell client to go ahead, except in the case of TLS startup | |
2489 | on connection, where outputting anything now upsets the clients and tends to | |
2490 | make them disconnect. We need to have an explicit fflush() here, to force out | |
2491 | the response. Other smtp_printf() calls do not need it, because in non-TLS | |
2492 | mode, the fflush() happens when smtp_getc() is called. */ | |
2493 | ||
817d9f57 | 2494 | if (!state->tlsp->on_connect) |
059ec3d9 | 2495 | { |
925ac8e4 | 2496 | smtp_printf("220 TLS go ahead\r\n", FALSE); |
9d1c15ef | 2497 | fflush(smtp_out); |
059ec3d9 PH |
2498 | } |
2499 | ||
2500 | /* Now negotiate the TLS session. We put our own timer on it, since it seems | |
8008accd JH |
2501 | that the GnuTLS library doesn't. |
2502 | From 3.1.0 there is gnutls_handshake_set_timeout() - but it requires you | |
2503 | to set (and clear down afterwards) up a pull-timeout callback function that does | |
2504 | a select, so we're no better off unless avoiding signals becomes an issue. */ | |
059ec3d9 | 2505 | |
17c76198 | 2506 | gnutls_transport_set_ptr2(state->session, |
27f19eb4 JH |
2507 | (gnutls_transport_ptr_t)(long) fileno(smtp_in), |
2508 | (gnutls_transport_ptr_t)(long) fileno(smtp_out)); | |
17c76198 PP |
2509 | state->fd_in = fileno(smtp_in); |
2510 | state->fd_out = fileno(smtp_out); | |
059ec3d9 PH |
2511 | |
2512 | sigalrm_seen = FALSE; | |
c2a1bba0 | 2513 | if (smtp_receive_timeout > 0) ALARM(smtp_receive_timeout); |
17c76198 | 2514 | do |
17c76198 | 2515 | rc = gnutls_handshake(state->session); |
05c3a5a2 | 2516 | while (rc == GNUTLS_E_AGAIN || rc == GNUTLS_E_INTERRUPTED && !sigalrm_seen); |
c2a1bba0 | 2517 | ALARM_CLR(0); |
059ec3d9 | 2518 | |
17c76198 | 2519 | if (rc != GNUTLS_E_SUCCESS) |
059ec3d9 | 2520 | { |
059ec3d9 PH |
2521 | /* It seems that, except in the case of a timeout, we have to close the |
2522 | connection right here; otherwise if the other end is running OpenSSL it hangs | |
2523 | until the server times out. */ | |
2524 | ||
60d10ce7 | 2525 | if (sigalrm_seen) |
ad7fc6eb | 2526 | { |
48224640 | 2527 | tls_error(US"gnutls_handshake", US"timed out", NULL, errstr); |
ad7fc6eb JH |
2528 | gnutls_db_remove_session(state->session); |
2529 | } | |
60d10ce7 | 2530 | else |
059ec3d9 | 2531 | { |
452a164f | 2532 | tls_error_gnu(US"gnutls_handshake", rc, NULL, errstr); |
f5d25c2b | 2533 | (void) gnutls_alert_send_appropriate(state->session, rc); |
ad7fc6eb | 2534 | gnutls_deinit(state->session); |
ed62aae3 | 2535 | gnutls_certificate_free_credentials(state->x509_cred); |
60d10ce7 | 2536 | millisleep(500); |
ad7fc6eb | 2537 | shutdown(state->fd_out, SHUT_WR); |
d7978c0f | 2538 | for (int i = 1024; fgetc(smtp_in) != EOF && i > 0; ) i--; /* drain skt */ |
f1e894f3 PH |
2539 | (void)fclose(smtp_out); |
2540 | (void)fclose(smtp_in); | |
60d10ce7 | 2541 | smtp_out = smtp_in = NULL; |
059ec3d9 PH |
2542 | } |
2543 | ||
2544 | return FAIL; | |
2545 | } | |
2546 | ||
17ba0f52 | 2547 | #ifdef GNUTLS_SFLAGS_EXT_MASTER_SECRET |
1c519e07 JH |
2548 | if (gnutls_session_get_flags(state->session) & GNUTLS_SFLAGS_EXT_MASTER_SECRET) |
2549 | tls_in.ext_master_secret = TRUE; | |
17ba0f52 | 2550 | #endif |
1c519e07 | 2551 | |
b10c87b3 JH |
2552 | #ifdef EXPERIMENTAL_TLS_RESUME |
2553 | tls_server_resume_posthandshake(state); | |
2554 | #endif | |
2555 | ||
dc6d1769 | 2556 | DEBUG(D_tls) post_handshake_debug(state); |
059ec3d9 | 2557 | |
17c76198 PP |
2558 | /* Verify after the fact */ |
2559 | ||
899b8bbc | 2560 | if (!verify_certificate(state, errstr)) |
059ec3d9 | 2561 | { |
9d1c15ef | 2562 | if (state->verify_requirement != VERIFY_OPTIONAL) |
17c76198 | 2563 | { |
cf0c6164 | 2564 | (void) tls_error(US"certificate verification failed", *errstr, NULL, errstr); |
9d1c15ef | 2565 | return FAIL; |
17c76198 | 2566 | } |
9d1c15ef JH |
2567 | DEBUG(D_tls) |
2568 | debug_printf("TLS: continuing on only because verification was optional, after: %s\n", | |
cf0c6164 | 2569 | *errstr); |
059ec3d9 PH |
2570 | } |
2571 | ||
17c76198 PP |
2572 | /* Sets various Exim expansion variables; always safe within server */ |
2573 | ||
9d1c15ef | 2574 | extract_exim_vars_from_tls_state(state); |
059ec3d9 PH |
2575 | |
2576 | /* TLS has been set up. Adjust the input functions to read via TLS, | |
2577 | and initialize appropriately. */ | |
2578 | ||
17c76198 | 2579 | state->xfer_buffer = store_malloc(ssl_xfer_buffer_size); |
059ec3d9 PH |
2580 | |
2581 | receive_getc = tls_getc; | |
0d81dabc | 2582 | receive_getbuf = tls_getbuf; |
584e96c6 | 2583 | receive_get_cache = tls_get_cache; |
059ec3d9 PH |
2584 | receive_ungetc = tls_ungetc; |
2585 | receive_feof = tls_feof; | |
2586 | receive_ferror = tls_ferror; | |
58eb016e | 2587 | receive_smtp_buffered = tls_smtp_buffered; |
059ec3d9 | 2588 | |
059ec3d9 PH |
2589 | return OK; |
2590 | } | |
2591 | ||
2592 | ||
2593 | ||
2594 | ||
aa2a70ba JH |
2595 | static void |
2596 | tls_client_setup_hostname_checks(host_item * host, exim_gnutls_state_st * state, | |
2597 | smtp_transport_options_block * ob) | |
2598 | { | |
3fb3231c | 2599 | if (verify_check_given_host(CUSS &ob->tls_verify_cert_hostnames, host) == OK) |
aa2a70ba | 2600 | { |
4af0d74a | 2601 | state->exp_tls_verify_cert_hostnames = |
8c5d388a | 2602 | #ifdef SUPPORT_I18N |
4af0d74a JH |
2603 | string_domain_utf8_to_alabel(host->name, NULL); |
2604 | #else | |
2605 | host->name; | |
2606 | #endif | |
aa2a70ba JH |
2607 | DEBUG(D_tls) |
2608 | debug_printf("TLS: server cert verification includes hostname: \"%s\".\n", | |
2609 | state->exp_tls_verify_cert_hostnames); | |
2610 | } | |
2611 | } | |
aa2a70ba JH |
2612 | |
2613 | ||
899b8bbc JH |
2614 | |
2615 | ||
2616 | #ifdef SUPPORT_DANE | |
2617 | /* Given our list of RRs from the TLSA lookup, build a lookup block in | |
2618 | GnuTLS-DANE's preferred format. Hang it on the state str for later | |
2619 | use in DANE verification. | |
2620 | ||
2621 | We point at the dnsa data not copy it, so it must remain valid until | |
2622 | after verification is done.*/ | |
2623 | ||
3674140c | 2624 | static BOOL |
899b8bbc JH |
2625 | dane_tlsa_load(exim_gnutls_state_st * state, dns_answer * dnsa) |
2626 | { | |
899b8bbc JH |
2627 | dns_scan dnss; |
2628 | int i; | |
2629 | const char ** dane_data; | |
2630 | int * dane_data_len; | |
2631 | ||
d7978c0f JH |
2632 | i = 1; |
2633 | for (dns_record * rr = dns_next_rr(dnsa, &dnss, RESET_ANSWERS); rr; | |
899b8bbc JH |
2634 | rr = dns_next_rr(dnsa, &dnss, RESET_NEXT) |
2635 | ) if (rr->type == T_TLSA) i++; | |
2636 | ||
f3ebb786 JH |
2637 | dane_data = store_get(i * sizeof(uschar *), FALSE); |
2638 | dane_data_len = store_get(i * sizeof(int), FALSE); | |
899b8bbc | 2639 | |
d7978c0f JH |
2640 | i = 0; |
2641 | for (dns_record * rr = dns_next_rr(dnsa, &dnss, RESET_ANSWERS); rr; | |
899b8bbc | 2642 | rr = dns_next_rr(dnsa, &dnss, RESET_NEXT) |
1b76ad22 | 2643 | ) if (rr->type == T_TLSA && rr->size > 3) |
899b8bbc JH |
2644 | { |
2645 | const uschar * p = rr->data; | |
f3ebb786 | 2646 | /*XXX need somehow to mark rr and its data as tainted. Doues this mean copying it? */ |
3674140c JH |
2647 | uint8_t usage = p[0], sel = p[1], type = p[2]; |
2648 | ||
2649 | DEBUG(D_tls) | |
2650 | debug_printf("TLSA: %d %d %d size %d\n", usage, sel, type, rr->size); | |
2651 | ||
94c13285 JH |
2652 | if ( (usage != DANESSL_USAGE_DANE_TA && usage != DANESSL_USAGE_DANE_EE) |
2653 | || (sel != 0 && sel != 1) | |
2654 | ) | |
2655 | continue; | |
3674140c JH |
2656 | switch(type) |
2657 | { | |
2658 | case 0: /* Full: cannot check at present */ | |
2659 | break; | |
2660 | case 1: if (rr->size != 3 + 256/8) continue; /* sha2-256 */ | |
2661 | break; | |
2662 | case 2: if (rr->size != 3 + 512/8) continue; /* sha2-512 */ | |
2663 | break; | |
2664 | default: continue; | |
2665 | } | |
899b8bbc JH |
2666 | |
2667 | tls_out.tlsa_usage |= 1<<usage; | |
48224640 | 2668 | dane_data[i] = CS p; |
899b8bbc JH |
2669 | dane_data_len[i++] = rr->size; |
2670 | } | |
3674140c JH |
2671 | |
2672 | if (!i) return FALSE; | |
2673 | ||
899b8bbc JH |
2674 | dane_data[i] = NULL; |
2675 | dane_data_len[i] = 0; | |
2676 | ||
2677 | state->dane_data = (char * const *)dane_data; | |
2678 | state->dane_data_len = dane_data_len; | |
3674140c | 2679 | return TRUE; |
899b8bbc JH |
2680 | } |
2681 | #endif | |
2682 | ||
2683 | ||
2684 | ||
b10c87b3 JH |
2685 | #ifdef EXPERIMENTAL_TLS_RESUME |
2686 | /* On the client, get any stashed session for the given IP from hints db | |
2687 | and apply it to the ssl-connection for attempted resumption. Although | |
2688 | there is a gnutls_session_ticket_enable_client() interface it is | |
2689 | documented as unnecessary (as of 3.6.7) as "session tickets are emabled | |
2690 | by deafult". There seems to be no way to disable them, so even hosts not | |
2691 | enabled by the transport option will be sent a ticket request. We will | |
2692 | however avoid storing and retrieving session information. */ | |
2693 | ||
2694 | static void | |
2695 | tls_retrieve_session(tls_support * tlsp, gnutls_session_t session, | |
2696 | host_item * host, smtp_transport_options_block * ob) | |
2697 | { | |
2698 | tlsp->resumption = RESUME_SUPPORTED; | |
2699 | if (verify_check_given_host(CUSS &ob->tls_resumption_hosts, host) == OK) | |
2700 | { | |
2701 | dbdata_tls_session * dt; | |
2702 | int len, rc; | |
2703 | open_db dbblock, * dbm_file; | |
2704 | ||
2705 | DEBUG(D_tls) | |
2706 | debug_printf("check for resumable session for %s\n", host->address); | |
2707 | tlsp->host_resumable = TRUE; | |
2708 | tlsp->resumption |= RESUME_CLIENT_REQUESTED; | |
2709 | if ((dbm_file = dbfn_open(US"tls", O_RDONLY, &dbblock, FALSE, FALSE))) | |
2710 | { | |
dea4b568 JH |
2711 | /* Key for the db is the IP. We'd like to filter the retrieved session |
2712 | for ticket advisory expiry, but 3.6.1 seems to give no access to that */ | |
2713 | ||
b10c87b3 JH |
2714 | if ((dt = dbfn_read_with_length(dbm_file, host->address, &len))) |
2715 | if (!(rc = gnutls_session_set_data(session, | |
2716 | CUS dt->session, (size_t)len - sizeof(dbdata_tls_session)))) | |
2717 | { | |
2718 | DEBUG(D_tls) debug_printf("good session\n"); | |
2719 | tlsp->resumption |= RESUME_CLIENT_SUGGESTED; | |
2720 | } | |
2721 | else DEBUG(D_tls) debug_printf("setting session resumption data: %s\n", | |
2722 | US gnutls_strerror(rc)); | |
2723 | dbfn_close(dbm_file); | |
2724 | } | |
2725 | } | |
2726 | } | |
2727 | ||
2728 | ||
2729 | static void | |
2730 | tls_save_session(tls_support * tlsp, gnutls_session_t session, const host_item * host) | |
2731 | { | |
2732 | /* TLS 1.2 - we get both the callback and the direct posthandshake call, | |
2733 | but this flag is not set until the second. TLS 1.3 it's the other way about. | |
2734 | Keep both calls as the session data cannot be extracted before handshake | |
2735 | completes. */ | |
2736 | ||
2737 | if (gnutls_session_get_flags(session) & GNUTLS_SFLAGS_SESSION_TICKET) | |
2738 | { | |
2739 | gnutls_datum_t tkt; | |
2740 | int rc; | |
2741 | ||
2742 | DEBUG(D_tls) debug_printf("server offered session ticket\n"); | |
2743 | tlsp->ticket_received = TRUE; | |
2744 | tlsp->resumption |= RESUME_SERVER_TICKET; | |
2745 | ||
2746 | if (tlsp->host_resumable) | |
2747 | if (!(rc = gnutls_session_get_data2(session, &tkt))) | |
2748 | { | |
2749 | open_db dbblock, * dbm_file; | |
2750 | int dlen = sizeof(dbdata_tls_session) + tkt.size; | |
f3ebb786 | 2751 | dbdata_tls_session * dt = store_get(dlen, TRUE); |
b10c87b3 JH |
2752 | |
2753 | DEBUG(D_tls) debug_printf("session data size %u\n", (unsigned)tkt.size); | |
2754 | memcpy(dt->session, tkt.data, tkt.size); | |
2755 | gnutls_free(tkt.data); | |
2756 | ||
2757 | if ((dbm_file = dbfn_open(US"tls", O_RDWR, &dbblock, FALSE, FALSE))) | |
2758 | { | |
2759 | /* key for the db is the IP */ | |
2760 | dbfn_delete(dbm_file, host->address); | |
2761 | dbfn_write(dbm_file, host->address, dt, dlen); | |
2762 | dbfn_close(dbm_file); | |
2763 | ||
2764 | DEBUG(D_tls) | |
2765 | debug_printf("wrote session db (len %u)\n", (unsigned)dlen); | |
2766 | } | |
2767 | } | |
2768 | else DEBUG(D_tls) | |
2769 | debug_printf("extract session data: %s\n", US gnutls_strerror(rc)); | |
2770 | } | |
2771 | } | |
2772 | ||
2773 | ||
2774 | /* With a TLS1.3 session, the ticket(s) are not seen until | |
2775 | the first data read is attempted. And there's often two of them. | |
2776 | Pick them up with this callback. We are also called for 1.2 | |
2777 | but we do nothing. | |
2778 | */ | |
2779 | static int | |
2780 | tls_client_ticket_cb(gnutls_session_t sess, u_int htype, unsigned when, | |
2781 | unsigned incoming, const gnutls_datum_t * msg) | |
2782 | { | |
2783 | exim_gnutls_state_st * state = gnutls_session_get_ptr(sess); | |
2784 | tls_support * tlsp = state->tlsp; | |
2785 | ||
2786 | DEBUG(D_tls) debug_printf("newticket cb\n"); | |
2787 | ||
2788 | if (!tlsp->ticket_received) | |
2789 | tls_save_session(tlsp, sess, state->host); | |
2790 | return 0; | |
2791 | } | |
2792 | ||
2793 | ||
2794 | static void | |
2795 | tls_client_resume_prehandshake(exim_gnutls_state_st * state, | |
2796 | tls_support * tlsp, host_item * host, | |
2797 | smtp_transport_options_block * ob) | |
2798 | { | |
2799 | gnutls_session_set_ptr(state->session, state); | |
2800 | gnutls_handshake_set_hook_function(state->session, | |
2801 | GNUTLS_HANDSHAKE_NEW_SESSION_TICKET, GNUTLS_HOOK_POST, tls_client_ticket_cb); | |
2802 | ||
2803 | tls_retrieve_session(tlsp, state->session, host, ob); | |
2804 | } | |
2805 | ||
2806 | static void | |
2807 | tls_client_resume_posthandshake(exim_gnutls_state_st * state, | |
2808 | tls_support * tlsp, host_item * host) | |
2809 | { | |
2810 | if (gnutls_session_is_resumed(state->session)) | |
2811 | { | |
2812 | DEBUG(D_tls) debug_printf("Session resumed\n"); | |
2813 | tlsp->resumption |= RESUME_USED; | |
2814 | } | |
2815 | ||
2816 | tls_save_session(tlsp, state->session, host); | |
2817 | } | |
2818 | #endif /* EXPERIMENTAL_TLS_RESUME */ | |
2819 | ||
2820 | ||
059ec3d9 PH |
2821 | /************************************************* |
2822 | * Start a TLS session in a client * | |
2823 | *************************************************/ | |
2824 | ||
2825 | /* Called from the smtp transport after STARTTLS has been accepted. | |
2826 | ||
2827 | Arguments: | |
c05bdbd6 JH |
2828 | cctx connection context |
2829 | conn_args connection details | |
2830 | cookie datum for randomness (not used) | |
2831 | tlsp record details of channel configuration here; must be non-NULL | |
2832 | errstr error string pointer | |
2833 | ||
2834 | Returns: TRUE for success with TLS session context set in smtp context, | |
2835 | FALSE on error | |
059ec3d9 PH |
2836 | */ |
2837 | ||
c05bdbd6 JH |
2838 | BOOL |
2839 | tls_client_start(client_conn_ctx * cctx, smtp_connect_args * conn_args, | |
2840 | void * cookie ARG_UNUSED, | |
2841 | tls_support * tlsp, uschar ** errstr) | |
059ec3d9 | 2842 | { |
c05bdbd6 JH |
2843 | host_item * host = conn_args->host; /* for msgs and option-tests */ |
2844 | transport_instance * tb = conn_args->tblock; /* always smtp or NULL */ | |
2845 | smtp_transport_options_block * ob = tb | |
afdb5e9c JH |
2846 | ? (smtp_transport_options_block *)tb->options_block |
2847 | : &smtp_transport_option_defaults; | |
059ec3d9 | 2848 | int rc; |
899b8bbc | 2849 | exim_gnutls_state_st * state = NULL; |
c05bdbd6 | 2850 | uschar * cipher_list = NULL; |
74f1a423 | 2851 | |
f2de3a33 | 2852 | #ifndef DISABLE_OCSP |
5130845b | 2853 | BOOL require_ocsp = |
3fb3231c | 2854 | verify_check_given_host(CUSS &ob->hosts_require_ocsp, host) == OK; |
44662487 | 2855 | BOOL request_ocsp = require_ocsp ? TRUE |
3fb3231c | 2856 | : verify_check_given_host(CUSS &ob->hosts_request_ocsp, host) == OK; |
2b4a568d | 2857 | #endif |
059ec3d9 | 2858 | |
c05bdbd6 | 2859 | DEBUG(D_tls) debug_printf("initialising GnuTLS as a client on fd %d\n", cctx->sock); |
059ec3d9 | 2860 | |
5ec37a55 | 2861 | #ifdef SUPPORT_DANE |
c05bdbd6 JH |
2862 | /* If dane is flagged, have either request or require dane for this host, and |
2863 | a TLSA record found. Therefore, dane verify required. Which implies cert must | |
2864 | be requested and supplied, dane verify must pass, and cert verify irrelevant | |
2865 | (incl. hostnames), and (caller handled) require_tls */ | |
2866 | ||
2867 | if (conn_args->dane && ob->dane_require_tls_ciphers) | |
5ec37a55 PP |
2868 | { |
2869 | /* not using expand_check_tlsvar because not yet in state */ | |
2870 | if (!expand_check(ob->dane_require_tls_ciphers, US"dane_require_tls_ciphers", | |
2871 | &cipher_list, errstr)) | |
c05bdbd6 | 2872 | return FALSE; |
cf260049 JH |
2873 | cipher_list = cipher_list && *cipher_list |
2874 | ? ob->dane_require_tls_ciphers : ob->tls_require_ciphers; | |
5ec37a55 PP |
2875 | } |
2876 | #endif | |
2877 | ||
2878 | if (!cipher_list) | |
2879 | cipher_list = ob->tls_require_ciphers; | |
2880 | ||
d85cdeb5 JH |
2881 | { |
2882 | #ifdef MEASURE_TIMING | |
2883 | struct timeval t0; | |
2884 | gettimeofday(&t0, NULL); | |
2885 | #endif | |
2886 | ||
2887 | if (tls_init(host, ob->tls_certificate, ob->tls_privatekey, | |
2888 | ob->tls_sni, ob->tls_verify_certificates, ob->tls_crl, | |
2889 | cipher_list, &state, tlsp, errstr) != OK) | |
2890 | return FALSE; | |
2891 | ||
2892 | #ifdef MEASURE_TIMING | |
2893 | report_time_since(&t0, US"client tls_init (delta)"); | |
2894 | #endif | |
2895 | } | |
059ec3d9 | 2896 | |
54c90be1 | 2897 | { |
65867078 JH |
2898 | int dh_min_bits = ob->tls_dh_min_bits; |
2899 | if (dh_min_bits < EXIM_CLIENT_DH_MIN_MIN_BITS) | |
2900 | { | |
2901 | DEBUG(D_tls) | |
2902 | debug_printf("WARNING: tls_dh_min_bits far too low," | |
2903 | " clamping %d up to %d\n", | |
2904 | dh_min_bits, EXIM_CLIENT_DH_MIN_MIN_BITS); | |
2905 | dh_min_bits = EXIM_CLIENT_DH_MIN_MIN_BITS; | |
2906 | } | |
54c90be1 | 2907 | |
65867078 JH |
2908 | DEBUG(D_tls) debug_printf("Setting D-H prime minimum" |
2909 | " acceptable bits to %d\n", | |
2910 | dh_min_bits); | |
2911 | gnutls_dh_set_prime_bits(state->session, dh_min_bits); | |
2912 | } | |
83da1223 | 2913 | |
94431adb | 2914 | /* Stick to the old behaviour for compatibility if tls_verify_certificates is |
2b4a568d JH |
2915 | set but both tls_verify_hosts and tls_try_verify_hosts are unset. Check only |
2916 | the specified host patterns if one of them is defined */ | |
2917 | ||
899b8bbc | 2918 | #ifdef SUPPORT_DANE |
c05bdbd6 | 2919 | if (conn_args->dane && dane_tlsa_load(state, &conn_args->tlsa_dnsa)) |
899b8bbc JH |
2920 | { |
2921 | DEBUG(D_tls) | |
2922 | debug_printf("TLS: server certificate DANE required.\n"); | |
2923 | state->verify_requirement = VERIFY_DANE; | |
2924 | gnutls_certificate_server_set_request(state->session, GNUTLS_CERT_REQUIRE); | |
899b8bbc JH |
2925 | } |
2926 | else | |
2927 | #endif | |
2928 | if ( ( state->exp_tls_verify_certificates | |
2929 | && !ob->tls_verify_hosts | |
2930 | && (!ob->tls_try_verify_hosts || !*ob->tls_try_verify_hosts) | |
2931 | ) | |
3fb3231c | 2932 | || verify_check_given_host(CUSS &ob->tls_verify_hosts, host) == OK |
899b8bbc | 2933 | ) |
17c76198 | 2934 | { |
aa2a70ba | 2935 | tls_client_setup_hostname_checks(host, state, ob); |
aa2a70ba JH |
2936 | DEBUG(D_tls) |
2937 | debug_printf("TLS: server certificate verification required.\n"); | |
2938 | state->verify_requirement = VERIFY_REQUIRED; | |
52f93eed WB |
2939 | gnutls_certificate_server_set_request(state->session, GNUTLS_CERT_REQUIRE); |
2940 | } | |
3fb3231c | 2941 | else if (verify_check_given_host(CUSS &ob->tls_try_verify_hosts, host) == OK) |
52f93eed | 2942 | { |
aa2a70ba | 2943 | tls_client_setup_hostname_checks(host, state, ob); |
e51c7be2 JH |
2944 | DEBUG(D_tls) |
2945 | debug_printf("TLS: server certificate verification optional.\n"); | |
52f93eed | 2946 | state->verify_requirement = VERIFY_OPTIONAL; |
17c76198 PP |
2947 | gnutls_certificate_server_set_request(state->session, GNUTLS_CERT_REQUEST); |
2948 | } | |
2949 | else | |
2950 | { | |
e51c7be2 JH |
2951 | DEBUG(D_tls) |
2952 | debug_printf("TLS: server certificate verification not required.\n"); | |
52f93eed WB |
2953 | state->verify_requirement = VERIFY_NONE; |
2954 | gnutls_certificate_server_set_request(state->session, GNUTLS_CERT_IGNORE); | |
17c76198 | 2955 | } |
059ec3d9 | 2956 | |
f2de3a33 JH |
2957 | #ifndef DISABLE_OCSP |
2958 | /* supported since GnuTLS 3.1.3 */ | |
44662487 | 2959 | if (request_ocsp) |
9d1c15ef JH |
2960 | { |
2961 | DEBUG(D_tls) debug_printf("TLS: will request OCSP stapling\n"); | |
65867078 JH |
2962 | if ((rc = gnutls_ocsp_status_request_enable_client(state->session, |
2963 | NULL, 0, NULL)) != OK) | |
74f1a423 | 2964 | { |
452a164f | 2965 | tls_error_gnu(US"cert-status-req", rc, state->host, errstr); |
c05bdbd6 | 2966 | return FALSE; |
74f1a423 JH |
2967 | } |
2968 | tlsp->ocsp = OCSP_NOT_RESP; | |
9d1c15ef | 2969 | } |
2b4a568d JH |
2970 | #endif |
2971 | ||
b10c87b3 JH |
2972 | #ifdef EXPERIMENTAL_TLS_RESUME |
2973 | tls_client_resume_prehandshake(state, tlsp, host, ob); | |
2974 | #endif | |
2975 | ||
0cbf2b82 | 2976 | #ifndef DISABLE_EVENT |
afdb5e9c | 2977 | if (tb && tb->event_action) |
a7538db1 | 2978 | { |
774ef2d7 | 2979 | state->event_action = tb->event_action; |
a7538db1 | 2980 | gnutls_session_set_ptr(state->session, state); |
723fe533 | 2981 | gnutls_certificate_set_verify_function(state->x509_cred, verify_cb); |
a7538db1 JH |
2982 | } |
2983 | #endif | |
2984 | ||
c05bdbd6 JH |
2985 | gnutls_transport_set_ptr(state->session, (gnutls_transport_ptr_t)(long) cctx->sock); |
2986 | state->fd_in = cctx->sock; | |
2987 | state->fd_out = cctx->sock; | |
059ec3d9 | 2988 | |
9d1c15ef | 2989 | DEBUG(D_tls) debug_printf("about to gnutls_handshake\n"); |
059ec3d9 PH |
2990 | /* There doesn't seem to be a built-in timeout on connection. */ |
2991 | ||
2992 | sigalrm_seen = FALSE; | |
c2a1bba0 | 2993 | ALARM(ob->command_timeout); |
17c76198 | 2994 | do |
17c76198 | 2995 | rc = gnutls_handshake(state->session); |
05c3a5a2 | 2996 | while (rc == GNUTLS_E_AGAIN || rc == GNUTLS_E_INTERRUPTED && !sigalrm_seen); |
c2a1bba0 | 2997 | ALARM_CLR(0); |
059ec3d9 | 2998 | |
4fe99a6c | 2999 | if (rc != GNUTLS_E_SUCCESS) |
74f1a423 | 3000 | { |
60d10ce7 JH |
3001 | if (sigalrm_seen) |
3002 | { | |
3003 | gnutls_alert_send(state->session, GNUTLS_AL_FATAL, GNUTLS_A_USER_CANCELED); | |
48224640 | 3004 | tls_error(US"gnutls_handshake", US"timed out", state->host, errstr); |
60d10ce7 JH |
3005 | } |
3006 | else | |
452a164f | 3007 | tls_error_gnu(US"gnutls_handshake", rc, state->host, errstr); |
c05bdbd6 | 3008 | return FALSE; |
74f1a423 | 3009 | } |
4fe99a6c | 3010 | |
dc6d1769 | 3011 | DEBUG(D_tls) post_handshake_debug(state); |
059ec3d9 | 3012 | |
17c76198 | 3013 | /* Verify late */ |
059ec3d9 | 3014 | |
899b8bbc | 3015 | if (!verify_certificate(state, errstr)) |
74f1a423 JH |
3016 | { |
3017 | tls_error(US"certificate verification failed", *errstr, state->host, errstr); | |
c05bdbd6 | 3018 | return FALSE; |
74f1a423 | 3019 | } |
059ec3d9 | 3020 | |
17ba0f52 | 3021 | #ifdef GNUTLS_SFLAGS_EXT_MASTER_SECRET |
1c519e07 JH |
3022 | if (gnutls_session_get_flags(state->session) & GNUTLS_SFLAGS_EXT_MASTER_SECRET) |
3023 | tlsp->ext_master_secret = TRUE; | |
17ba0f52 | 3024 | #endif |
1c519e07 | 3025 | |
f2de3a33 | 3026 | #ifndef DISABLE_OCSP |
7a501c87 | 3027 | if (request_ocsp) |
2b4a568d JH |
3028 | { |
3029 | DEBUG(D_tls) | |
3030 | { | |
3031 | gnutls_datum_t stapling; | |
3032 | gnutls_ocsp_resp_t resp; | |
3033 | gnutls_datum_t printed; | |
e326959e JH |
3034 | unsigned idx = 0; |
3035 | ||
3036 | for (; | |
3037 | # ifdef GNUTLS_OCSP_STATUS_REQUEST_GET2 | |
3038 | (rc = gnutls_ocsp_status_request_get2(state->session, idx, &stapling)) == 0; | |
3039 | #else | |
3040 | (rc = gnutls_ocsp_status_request_get(state->session, &stapling)) == 0; | |
3041 | #endif | |
3042 | idx++) | |
3043 | if ( (rc= gnutls_ocsp_resp_init(&resp)) == 0 | |
3044 | && (rc= gnutls_ocsp_resp_import(resp, &stapling)) == 0 | |
3045 | && (rc= gnutls_ocsp_resp_print(resp, GNUTLS_OCSP_PRINT_COMPACT, &printed)) == 0 | |
3046 | ) | |
3047 | { | |
3048 | debug_printf("%.4096s", printed.data); | |
3049 | gnutls_free(printed.data); | |
3050 | } | |
3051 | else | |
3052 | (void) tls_error_gnu(US"ocsp decode", rc, state->host, errstr); | |
3053 | if (idx == 0 && rc) | |
452a164f | 3054 | (void) tls_error_gnu(US"ocsp decode", rc, state->host, errstr); |
2b4a568d JH |
3055 | } |
3056 | ||
2b4a568d | 3057 | if (gnutls_ocsp_status_request_is_checked(state->session, 0) == 0) |
018058b2 | 3058 | { |
74f1a423 JH |
3059 | tlsp->ocsp = OCSP_FAILED; |
3060 | tls_error(US"certificate status check failed", NULL, state->host, errstr); | |
7a501c87 JH |
3061 | if (require_ocsp) |
3062 | return FALSE; | |
3063 | } | |
3064 | else | |
3065 | { | |
3066 | DEBUG(D_tls) debug_printf("Passed OCSP checking\n"); | |
3067 | tlsp->ocsp = OCSP_VFIED; | |
018058b2 | 3068 | } |
2b4a568d JH |
3069 | } |
3070 | #endif | |
3071 | ||
b10c87b3 JH |
3072 | #ifdef EXPERIMENTAL_TLS_RESUME |
3073 | tls_client_resume_posthandshake(state, tlsp, host); | |
3074 | #endif | |
059ec3d9 | 3075 | |
4fe99a6c | 3076 | /* Sets various Exim expansion variables; may need to adjust for ACL callouts */ |
059ec3d9 | 3077 | |
9d1c15ef | 3078 | extract_exim_vars_from_tls_state(state); |
059ec3d9 | 3079 | |
c05bdbd6 JH |
3080 | cctx->tls_ctx = state; |
3081 | return TRUE; | |
059ec3d9 PH |
3082 | } |
3083 | ||
3084 | ||
3085 | ||
17c76198 | 3086 | |
059ec3d9 | 3087 | /************************************************* |
17c76198 | 3088 | * Close down a TLS session * |
059ec3d9 PH |
3089 | *************************************************/ |
3090 | ||
17c76198 PP |
3091 | /* This is also called from within a delivery subprocess forked from the |
3092 | daemon, to shut down the TLS library, without actually doing a shutdown (which | |
3093 | would tamper with the TLS session in the parent process). | |
059ec3d9 | 3094 | |
dec766a1 | 3095 | Arguments: |
74f1a423 | 3096 | ct_ctx client context pointer, or NULL for the one global server context |
dec766a1 | 3097 | shutdown 1 if TLS close-alert is to be sent, |
afdb5e9c | 3098 | 2 if also response to be waited for |
dec766a1 | 3099 | |
17c76198 | 3100 | Returns: nothing |
059ec3d9 PH |
3101 | */ |
3102 | ||
17c76198 | 3103 | void |
74f1a423 | 3104 | tls_close(void * ct_ctx, int shutdown) |
059ec3d9 | 3105 | { |
74f1a423 | 3106 | exim_gnutls_state_st * state = ct_ctx ? ct_ctx : &state_server; |
bd231acd | 3107 | tls_support * tlsp = state->tlsp; |
059ec3d9 | 3108 | |
bd231acd | 3109 | if (!tlsp || tlsp->active.sock < 0) return; /* TLS was not active */ |
17c76198 PP |
3110 | |
3111 | if (shutdown) | |
3112 | { | |
dec766a1 WB |
3113 | DEBUG(D_tls) debug_printf("tls_close(): shutting down TLS%s\n", |
3114 | shutdown > 1 ? " (with response-wait)" : ""); | |
3115 | ||
c2a1bba0 | 3116 | ALARM(2); |
dec766a1 | 3117 | gnutls_bye(state->session, shutdown > 1 ? GNUTLS_SHUT_RDWR : GNUTLS_SHUT_WR); |
c2a1bba0 | 3118 | ALARM_CLR(0); |
17c76198 PP |
3119 | } |
3120 | ||
bd231acd JH |
3121 | if (!ct_ctx) /* server */ |
3122 | { | |
3123 | receive_getc = smtp_getc; | |
3124 | receive_getbuf = smtp_getbuf; | |
3125 | receive_get_cache = smtp_get_cache; | |
3126 | receive_ungetc = smtp_ungetc; | |
3127 | receive_feof = smtp_feof; | |
3128 | receive_ferror = smtp_ferror; | |
3129 | receive_smtp_buffered = smtp_buffered; | |
3130 | } | |
3131 | ||
17c76198 | 3132 | gnutls_deinit(state->session); |
ed62aae3 HSHR |
3133 | gnutls_certificate_free_credentials(state->x509_cred); |
3134 | ||
bd231acd JH |
3135 | tlsp->active.sock = -1; |
3136 | tlsp->active.tls_ctx = NULL; | |
3137 | /* Leave bits, peercert, cipher, peerdn, certificate_verified set, for logging */ | |
b1a32a3c | 3138 | tlsp->channelbinding = NULL; |
bd231acd | 3139 | |
17c76198 | 3140 | |
b808677c | 3141 | if (state->xfer_buffer) store_free(state->xfer_buffer); |
17c76198 | 3142 | memcpy(state, &exim_gnutls_state_init, sizeof(exim_gnutls_state_init)); |
059ec3d9 PH |
3143 | } |
3144 | ||
3145 | ||
3146 | ||
17c76198 | 3147 | |
0d81dabc JH |
3148 | static BOOL |
3149 | tls_refill(unsigned lim) | |
3150 | { | |
3151 | exim_gnutls_state_st * state = &state_server; | |
3152 | ssize_t inbytes; | |
3153 | ||
50a3f205 | 3154 | DEBUG(D_tls) debug_printf("Calling gnutls_record_recv(session=%p, buffer=%p, buffersize=%u)\n", |
0d81dabc JH |
3155 | state->session, state->xfer_buffer, ssl_xfer_buffer_size); |
3156 | ||
f1fed05b | 3157 | sigalrm_seen = FALSE; |
c2a1bba0 | 3158 | if (smtp_receive_timeout > 0) ALARM(smtp_receive_timeout); |
4896a319 | 3159 | |
05c3a5a2 HSHR |
3160 | do |
3161 | inbytes = gnutls_record_recv(state->session, state->xfer_buffer, | |
3162 | MIN(ssl_xfer_buffer_size, lim)); | |
3163 | while (inbytes == GNUTLS_E_AGAIN); | |
4896a319 | 3164 | |
c2a1bba0 | 3165 | if (smtp_receive_timeout > 0) ALARM_CLR(0); |
9723f966 JH |
3166 | |
3167 | if (had_command_timeout) /* set by signal handler */ | |
3168 | smtp_command_timeout_exit(); /* does not return */ | |
3169 | if (had_command_sigterm) | |
3170 | smtp_command_sigterm_exit(); | |
3171 | if (had_data_timeout) | |
3172 | smtp_data_timeout_exit(); | |
3173 | if (had_data_sigint) | |
3174 | smtp_data_sigint_exit(); | |
3175 | ||
3176 | /* Timeouts do not get this far. A zero-byte return appears to mean that the | |
3177 | TLS session has been closed down, not that the socket itself has been closed | |
3178 | down. Revert to non-TLS handling. */ | |
0d81dabc JH |
3179 | |
3180 | if (sigalrm_seen) | |
3181 | { | |
3182 | DEBUG(D_tls) debug_printf("Got tls read timeout\n"); | |
8b77d27a | 3183 | state->xfer_error = TRUE; |
0d81dabc JH |
3184 | return FALSE; |
3185 | } | |
3186 | ||
3187 | else if (inbytes == 0) | |
3188 | { | |
3189 | DEBUG(D_tls) debug_printf("Got TLS_EOF\n"); | |
bd231acd | 3190 | tls_close(NULL, TLS_NO_SHUTDOWN); |
0d81dabc JH |
3191 | return FALSE; |
3192 | } | |
3193 | ||
3194 | /* Handle genuine errors */ | |
3195 | ||
3196 | else if (inbytes < 0) | |
3197 | { | |
95f52235 | 3198 | DEBUG(D_tls) debug_printf("%s: err from gnutls_record_recv\n", __FUNCTION__); |
0d81dabc | 3199 | record_io_error(state, (int) inbytes, US"recv", NULL); |
8b77d27a | 3200 | state->xfer_error = TRUE; |
0d81dabc JH |
3201 | return FALSE; |
3202 | } | |
3203 | #ifndef DISABLE_DKIM | |
3204 | dkim_exim_verify_feed(state->xfer_buffer, inbytes); | |
3205 | #endif | |
3206 | state->xfer_buffer_hwm = (int) inbytes; | |
3207 | state->xfer_buffer_lwm = 0; | |
3208 | return TRUE; | |
3209 | } | |
3210 | ||
059ec3d9 PH |
3211 | /************************************************* |
3212 | * TLS version of getc * | |
3213 | *************************************************/ | |
3214 | ||
3215 | /* This gets the next byte from the TLS input buffer. If the buffer is empty, | |
3216 | it refills the buffer via the GnuTLS reading function. | |
817d9f57 | 3217 | Only used by the server-side TLS. |
059ec3d9 | 3218 | |
17c76198 PP |
3219 | This feeds DKIM and should be used for all message-body reads. |
3220 | ||
aded2255 | 3221 | Arguments: lim Maximum amount to read/buffer |
059ec3d9 PH |
3222 | Returns: the next character or EOF |
3223 | */ | |
3224 | ||
3225 | int | |
bd8fbe36 | 3226 | tls_getc(unsigned lim) |
059ec3d9 | 3227 | { |
0d81dabc | 3228 | exim_gnutls_state_st * state = &state_server; |
059ec3d9 | 3229 | |
0d81dabc JH |
3230 | if (state->xfer_buffer_lwm >= state->xfer_buffer_hwm) |
3231 | if (!tls_refill(lim)) | |
3232 | return state->xfer_error ? EOF : smtp_getc(lim); | |
ed62aae3 | 3233 | |
0d81dabc | 3234 | /* Something in the buffer; return next uschar */ |
059ec3d9 | 3235 | |
0d81dabc JH |
3236 | return state->xfer_buffer[state->xfer_buffer_lwm++]; |
3237 | } | |
059ec3d9 | 3238 | |
0d81dabc JH |
3239 | uschar * |
3240 | tls_getbuf(unsigned * len) | |
3241 | { | |
3242 | exim_gnutls_state_st * state = &state_server; | |
3243 | unsigned size; | |
3244 | uschar * buf; | |
059ec3d9 | 3245 | |
0d81dabc JH |
3246 | if (state->xfer_buffer_lwm >= state->xfer_buffer_hwm) |
3247 | if (!tls_refill(*len)) | |
059ec3d9 | 3248 | { |
0d81dabc JH |
3249 | if (!state->xfer_error) return smtp_getbuf(len); |
3250 | *len = 0; | |
3251 | return NULL; | |
059ec3d9 | 3252 | } |
059ec3d9 | 3253 | |
0d81dabc JH |
3254 | if ((size = state->xfer_buffer_hwm - state->xfer_buffer_lwm) > *len) |
3255 | size = *len; | |
3256 | buf = &state->xfer_buffer[state->xfer_buffer_lwm]; | |
3257 | state->xfer_buffer_lwm += size; | |
3258 | *len = size; | |
3259 | return buf; | |
059ec3d9 PH |
3260 | } |
3261 | ||
0d81dabc | 3262 | |
584e96c6 JH |
3263 | void |
3264 | tls_get_cache() | |
3265 | { | |
9960d1e5 | 3266 | #ifndef DISABLE_DKIM |
584e96c6 JH |
3267 | exim_gnutls_state_st * state = &state_server; |
3268 | int n = state->xfer_buffer_hwm - state->xfer_buffer_lwm; | |
3269 | if (n > 0) | |
3270 | dkim_exim_verify_feed(state->xfer_buffer+state->xfer_buffer_lwm, n); | |
584e96c6 | 3271 | #endif |
9960d1e5 | 3272 | } |
584e96c6 | 3273 | |
059ec3d9 | 3274 | |
925ac8e4 JH |
3275 | BOOL |
3276 | tls_could_read(void) | |
3277 | { | |
3278 | return state_server.xfer_buffer_lwm < state_server.xfer_buffer_hwm | |
3279 | || gnutls_record_check_pending(state_server.session) > 0; | |
3280 | } | |
3281 | ||
3282 | ||
059ec3d9 | 3283 | |
17c76198 | 3284 | |
059ec3d9 PH |
3285 | /************************************************* |
3286 | * Read bytes from TLS channel * | |
3287 | *************************************************/ | |
3288 | ||
17c76198 PP |
3289 | /* This does not feed DKIM, so if the caller uses this for reading message body, |
3290 | then the caller must feed DKIM. | |
817d9f57 | 3291 | |
059ec3d9 | 3292 | Arguments: |
74f1a423 | 3293 | ct_ctx client context pointer, or NULL for the one global server context |
059ec3d9 PH |
3294 | buff buffer of data |
3295 | len size of buffer | |
3296 | ||
3297 | Returns: the number of bytes read | |
afdb5e9c | 3298 | -1 after a failed read, including EOF |
059ec3d9 PH |
3299 | */ |
3300 | ||
3301 | int | |
74f1a423 | 3302 | tls_read(void * ct_ctx, uschar *buff, size_t len) |
059ec3d9 | 3303 | { |
74f1a423 | 3304 | exim_gnutls_state_st * state = ct_ctx ? ct_ctx : &state_server; |
17c76198 | 3305 | ssize_t inbytes; |
059ec3d9 | 3306 | |
17c76198 PP |
3307 | if (len > INT_MAX) |
3308 | len = INT_MAX; | |
059ec3d9 | 3309 | |
17c76198 PP |
3310 | if (state->xfer_buffer_lwm < state->xfer_buffer_hwm) |
3311 | DEBUG(D_tls) | |
3312 | debug_printf("*** PROBABLY A BUG *** " \ | |
3313 | "tls_read() called with data in the tls_getc() buffer, %d ignored\n", | |
3314 | state->xfer_buffer_hwm - state->xfer_buffer_lwm); | |
3315 | ||
3316 | DEBUG(D_tls) | |
50a3f205 | 3317 | debug_printf("Calling gnutls_record_recv(session=%p, buffer=%p, len=" SIZE_T_FMT ")\n", |
17c76198 PP |
3318 | state->session, buff, len); |
3319 | ||
05c3a5a2 HSHR |
3320 | do |
3321 | inbytes = gnutls_record_recv(state->session, buff, len); | |
3322 | while (inbytes == GNUTLS_E_AGAIN); | |
4896a319 | 3323 | |
059ec3d9 PH |
3324 | if (inbytes > 0) return inbytes; |
3325 | if (inbytes == 0) | |
3326 | { | |
3327 | DEBUG(D_tls) debug_printf("Got TLS_EOF\n"); | |
3328 | } | |
5fd28bb8 | 3329 | else |
4896a319 | 3330 | { |
95f52235 | 3331 | DEBUG(D_tls) debug_printf("%s: err from gnutls_record_recv\n", __FUNCTION__); |
4896a319 AM |
3332 | record_io_error(state, (int)inbytes, US"recv", NULL); |
3333 | } | |
059ec3d9 PH |
3334 | |
3335 | return -1; | |
3336 | } | |
3337 | ||
3338 | ||
3339 | ||
17c76198 | 3340 | |
059ec3d9 PH |
3341 | /************************************************* |
3342 | * Write bytes down TLS channel * | |
3343 | *************************************************/ | |
3344 | ||
3345 | /* | |
3346 | Arguments: | |
74f1a423 | 3347 | ct_ctx client context pointer, or NULL for the one global server context |
059ec3d9 PH |
3348 | buff buffer of data |
3349 | len number of bytes | |
925ac8e4 | 3350 | more more data expected soon |
059ec3d9 | 3351 | |
30398c06 JH |
3352 | Calling with len zero and more unset will flush buffered writes. The buff |
3353 | argument can be null for that case. | |
3354 | ||
059ec3d9 PH |
3355 | Returns: the number of bytes after a successful write, |
3356 | -1 after a failed write | |
3357 | */ | |
3358 | ||
3359 | int | |
74f1a423 | 3360 | tls_write(void * ct_ctx, const uschar * buff, size_t len, BOOL more) |
059ec3d9 | 3361 | { |
17c76198 PP |
3362 | ssize_t outbytes; |
3363 | size_t left = len; | |
74f1a423 | 3364 | exim_gnutls_state_st * state = ct_ctx ? ct_ctx : &state_server; |
925ac8e4 | 3365 | |
8f9adfd3 HSHR |
3366 | #ifdef SUPPORT_CORK |
3367 | if (more && !state->corked) | |
3368 | { | |
3369 | DEBUG(D_tls) debug_printf("gnutls_record_cork(session=%p)\n", state->session); | |
3370 | gnutls_record_cork(state->session); | |
3371 | state->corked = TRUE; | |
3372 | } | |
925ac8e4 JH |
3373 | #endif |
3374 | ||
3375 | DEBUG(D_tls) debug_printf("%s(%p, " SIZE_T_FMT "%s)\n", __FUNCTION__, | |
3376 | buff, left, more ? ", more" : ""); | |
059ec3d9 | 3377 | |
059ec3d9 PH |
3378 | while (left > 0) |
3379 | { | |
50a3f205 | 3380 | DEBUG(D_tls) debug_printf("gnutls_record_send(session=%p, buffer=%p, left=" SIZE_T_FMT ")\n", |
d89f32c2 | 3381 | state->session, buff, left); |
4896a319 | 3382 | |
05c3a5a2 HSHR |
3383 | do |
3384 | outbytes = gnutls_record_send(state->session, buff, left); | |
3385 | while (outbytes == GNUTLS_E_AGAIN); | |
059ec3d9 | 3386 | |
17c76198 | 3387 | DEBUG(D_tls) debug_printf("outbytes=" SSIZE_T_FMT "\n", outbytes); |
8f9adfd3 | 3388 | |
059ec3d9 PH |
3389 | if (outbytes < 0) |
3390 | { | |
1b76ad22 | 3391 | DEBUG(D_tls) debug_printf("%s: gnutls_record_send err\n", __FUNCTION__); |
17c76198 | 3392 | record_io_error(state, outbytes, US"send", NULL); |
059ec3d9 PH |
3393 | return -1; |
3394 | } | |
3395 | if (outbytes == 0) | |
3396 | { | |
17c76198 | 3397 | record_io_error(state, 0, US"send", US"TLS channel closed on write"); |
059ec3d9 PH |
3398 | return -1; |
3399 | } | |
3400 | ||
3401 | left -= outbytes; | |
3402 | buff += outbytes; | |
3403 | } | |
3404 | ||
17c76198 PP |
3405 | if (len > INT_MAX) |
3406 | { | |
3407 | DEBUG(D_tls) | |
3408 | debug_printf("Whoops! Wrote more bytes (" SIZE_T_FMT ") than INT_MAX\n", | |
3409 | len); | |
3410 | len = INT_MAX; | |
3411 | } | |
3412 | ||
925ac8e4 | 3413 | #ifdef SUPPORT_CORK |
8f9adfd3 HSHR |
3414 | if (!more && state->corked) |
3415 | { | |
3416 | DEBUG(D_tls) debug_printf("gnutls_record_uncork(session=%p)\n", state->session); | |
05c3a5a2 HSHR |
3417 | do |
3418 | /* We can't use GNUTLS_RECORD_WAIT here, as it retries on | |
3419 | GNUTLS_E_AGAIN || GNUTLS_E_INTR, which would break our timeout set by alarm(). | |
3420 | The GNUTLS_E_AGAIN should not happen ever, as our sockets are blocking anyway. | |
3421 | But who knows. (That all relies on the fact that GNUTLS_E_INTR and GNUTLS_E_AGAIN | |
3422 | match the EINTR and EAGAIN errno values.) */ | |
3423 | outbytes = gnutls_record_uncork(state->session, 0); | |
3424 | while (outbytes == GNUTLS_E_AGAIN); | |
3425 | ||
d8d7e3a4 HSHR |
3426 | if (outbytes < 0) |
3427 | { | |
3428 | record_io_error(state, len, US"uncork", NULL); | |
3429 | return -1; | |
3430 | } | |
05c3a5a2 | 3431 | |
8f9adfd3 | 3432 | state->corked = FALSE; |
925ac8e4 JH |
3433 | } |
3434 | #endif | |
3435 | ||
17c76198 | 3436 | return (int) len; |
059ec3d9 PH |
3437 | } |
3438 | ||
3439 | ||
3440 | ||
17c76198 | 3441 | |
059ec3d9 | 3442 | /************************************************* |
17c76198 | 3443 | * Random number generation * |
059ec3d9 PH |
3444 | *************************************************/ |
3445 | ||
17c76198 PP |
3446 | /* Pseudo-random number generation. The result is not expected to be |
3447 | cryptographically strong but not so weak that someone will shoot themselves | |
3448 | in the foot using it as a nonce in input in some email header scheme or | |
3449 | whatever weirdness they'll twist this into. The result should handle fork() | |
3450 | and avoid repeating sequences. OpenSSL handles that for us. | |
059ec3d9 | 3451 | |
17c76198 PP |
3452 | Arguments: |
3453 | max range maximum | |
3454 | Returns a random number in range [0, max-1] | |
059ec3d9 PH |
3455 | */ |
3456 | ||
af3498d6 | 3457 | #ifdef HAVE_GNUTLS_RND |
17c76198 PP |
3458 | int |
3459 | vaguely_random_number(int max) | |
059ec3d9 | 3460 | { |
17c76198 PP |
3461 | unsigned int r; |
3462 | int i, needed_len; | |
17c76198 PP |
3463 | uschar smallbuf[sizeof(r)]; |
3464 | ||
3465 | if (max <= 1) | |
3466 | return 0; | |
3467 | ||
3468 | needed_len = sizeof(r); | |
3469 | /* Don't take 8 times more entropy than needed if int is 8 octets and we were | |
d7978c0f JH |
3470 | asked for a number less than 10. */ |
3471 | ||
17c76198 PP |
3472 | for (r = max, i = 0; r; ++i) |
3473 | r >>= 1; | |
3474 | i = (i + 7) / 8; | |
3475 | if (i < needed_len) | |
3476 | needed_len = i; | |
3477 | ||
3478 | i = gnutls_rnd(GNUTLS_RND_NONCE, smallbuf, needed_len); | |
3479 | if (i < 0) | |
059ec3d9 | 3480 | { |
17c76198 PP |
3481 | DEBUG(D_all) debug_printf("gnutls_rnd() failed, using fallback.\n"); |
3482 | return vaguely_random_number_fallback(max); | |
3483 | } | |
3484 | r = 0; | |
d7978c0f JH |
3485 | for (uschar * p = smallbuf; needed_len; --needed_len, ++p) |
3486 | r = r * 256 + *p; | |
059ec3d9 | 3487 | |
17c76198 PP |
3488 | /* We don't particularly care about weighted results; if someone wants |
3489 | * smooth distribution and cares enough then they should submit a patch then. */ | |
3490 | return r % max; | |
059ec3d9 | 3491 | } |
af3498d6 PP |
3492 | #else /* HAVE_GNUTLS_RND */ |
3493 | int | |
3494 | vaguely_random_number(int max) | |
3495 | { | |
3496 | return vaguely_random_number_fallback(max); | |
3497 | } | |
3498 | #endif /* HAVE_GNUTLS_RND */ | |
059ec3d9 | 3499 | |
36f12725 NM |
3500 | |
3501 | ||
3502 | ||
3375e053 PP |
3503 | /************************************************* |
3504 | * Let tls_require_ciphers be checked at startup * | |
3505 | *************************************************/ | |
3506 | ||
3507 | /* The tls_require_ciphers option, if set, must be something which the | |
3508 | library can parse. | |
3509 | ||
3510 | Returns: NULL on success, or error message | |
3511 | */ | |
3512 | ||
3513 | uschar * | |
3514 | tls_validate_require_cipher(void) | |
3515 | { | |
3516 | int rc; | |
3517 | uschar *expciphers = NULL; | |
3518 | gnutls_priority_t priority_cache; | |
3519 | const char *errpos; | |
cf0c6164 | 3520 | uschar * dummy_errstr; |
3375e053 | 3521 | |
4d2a62a3 JH |
3522 | #ifdef GNUTLS_AUTO_GLOBAL_INIT |
3523 | # define validate_check_rc(Label) do { \ | |
3524 | if (rc != GNUTLS_E_SUCCESS) { if (exim_gnutls_base_init_done) \ | |
3525 | return string_sprintf("%s failed: %s", (Label), gnutls_strerror(rc)); } } while (0) | |
3526 | # define return_deinit(Label) do { return (Label); } while (0) | |
3527 | #else | |
3528 | # define validate_check_rc(Label) do { \ | |
3375e053 | 3529 | if (rc != GNUTLS_E_SUCCESS) { if (exim_gnutls_base_init_done) gnutls_global_deinit(); \ |
4d2a62a3 JH |
3530 | return string_sprintf("%s failed: %s", (Label), gnutls_strerror(rc)); } } while (0) |
3531 | # define return_deinit(Label) do { gnutls_global_deinit(); return (Label); } while (0) | |
3532 | #endif | |
3375e053 PP |
3533 | |
3534 | if (exim_gnutls_base_init_done) | |
3535 | log_write(0, LOG_MAIN|LOG_PANIC, | |
3536 | "already initialised GnuTLS, Exim developer bug"); | |
3537 | ||
9f707b89 | 3538 | #if defined(HAVE_GNUTLS_PKCS11) && !defined(GNUTLS_AUTO_PKCS11_MANUAL) |
2519e60d | 3539 | if (!gnutls_allow_auto_pkcs11) |
a5f239e4 PP |
3540 | { |
3541 | rc = gnutls_pkcs11_init(GNUTLS_PKCS11_FLAG_MANUAL, NULL); | |
3542 | validate_check_rc(US"gnutls_pkcs11_init"); | |
3543 | } | |
3544 | #endif | |
4d2a62a3 | 3545 | #ifndef GNUTLS_AUTO_GLOBAL_INIT |
3375e053 PP |
3546 | rc = gnutls_global_init(); |
3547 | validate_check_rc(US"gnutls_global_init()"); | |
4d2a62a3 | 3548 | #endif |
3375e053 PP |
3549 | exim_gnutls_base_init_done = TRUE; |
3550 | ||
3551 | if (!(tls_require_ciphers && *tls_require_ciphers)) | |
3552 | return_deinit(NULL); | |
3553 | ||
cf0c6164 JH |
3554 | if (!expand_check(tls_require_ciphers, US"tls_require_ciphers", &expciphers, |
3555 | &dummy_errstr)) | |
3375e053 PP |
3556 | return_deinit(US"failed to expand tls_require_ciphers"); |
3557 | ||
3558 | if (!(expciphers && *expciphers)) | |
3559 | return_deinit(NULL); | |
3560 | ||
3561 | DEBUG(D_tls) | |
3562 | debug_printf("tls_require_ciphers expands to \"%s\"\n", expciphers); | |
3563 | ||
3564 | rc = gnutls_priority_init(&priority_cache, CS expciphers, &errpos); | |
3565 | validate_check_rc(string_sprintf( | |
3566 | "gnutls_priority_init(%s) failed at offset %ld, \"%.8s..\"", | |
3567 | expciphers, errpos - CS expciphers, errpos)); | |
3568 | ||
3569 | #undef return_deinit | |
3570 | #undef validate_check_rc | |
4d2a62a3 | 3571 | #ifndef GNUTLS_AUTO_GLOBAL_INIT |
3375e053 | 3572 | gnutls_global_deinit(); |
4d2a62a3 | 3573 | #endif |
3375e053 PP |
3574 | |
3575 | return NULL; | |
3576 | } | |
3577 | ||
3578 | ||
3579 | ||
3580 | ||
36f12725 NM |
3581 | /************************************************* |
3582 | * Report the library versions. * | |
3583 | *************************************************/ | |
3584 | ||
3585 | /* See a description in tls-openssl.c for an explanation of why this exists. | |
3586 | ||
3587 | Arguments: a FILE* to print the results to | |
3588 | Returns: nothing | |
3589 | */ | |
3590 | ||
3591 | void | |
3592 | tls_version_report(FILE *f) | |
3593 | { | |
754a0503 PP |
3594 | fprintf(f, "Library version: GnuTLS: Compile: %s\n" |
3595 | " Runtime: %s\n", | |
3596 | LIBGNUTLS_VERSION, | |
3597 | gnutls_check_version(NULL)); | |
36f12725 NM |
3598 | } |
3599 | ||
b10c87b3 | 3600 | #endif /*!MACRO_PREDEF*/ |
2b4a568d JH |
3601 | /* vi: aw ai sw=2 |
3602 | */ | |
059ec3d9 | 3603 | /* End of tls-gnu.c */ |