Commit | Line | Data |
---|---|---|
059ec3d9 PH |
1 | /************************************************* |
2 | * Exim - an Internet mail transport agent * | |
3 | *************************************************/ | |
4 | ||
5a66c31b | 5 | /* Copyright (c) University of Cambridge 1995 - 2014 */ |
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 | |
16 | Mavroyanopoulos. The revamp is partially a rewrite, partially cut&paste as | |
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> | |
a5f239e4 PP |
42 | /* needed to disable PKCS11 autoload unless requested */ |
43 | #if GNUTLS_VERSION_NUMBER >= 0x020c00 | |
44 | # include <gnutls/pkcs11.h> | |
45 | #endif | |
7e07527a JH |
46 | #if GNUTLS_VERSION_NUMBER < 0x030103 && !defined(DISABLE_OCSP) |
47 | # warning "GnuTLS library version too old; define DISABLE_OCSP in Makefile" | |
48 | # define DISABLE_OCSP | |
49 | #endif | |
774ef2d7 JH |
50 | #if GNUTLS_VERSION_NUMBER < 0x020a00 && defined(EXPERIMENTAL_EVENT) |
51 | # warning "GnuTLS library version too old; tls:cert event unsupported" | |
52 | # undef EXPERIMENTAL_EVENT | |
a7538db1 | 53 | #endif |
a7fec7a7 JH |
54 | #if GNUTLS_VERSION_NUMBER >= 0x030306 |
55 | # define SUPPORT_CA_DIR | |
56 | #else | |
57 | # undef SUPPORT_CA_DIR | |
58 | #endif | |
7e07527a | 59 | |
f2de3a33 | 60 | #ifndef DISABLE_OCSP |
2b4a568d JH |
61 | # include <gnutls/ocsp.h> |
62 | #endif | |
059ec3d9 | 63 | |
17c76198 | 64 | /* GnuTLS 2 vs 3 |
059ec3d9 | 65 | |
17c76198 PP |
66 | GnuTLS 3 only: |
67 | gnutls_global_set_audit_log_function() | |
059ec3d9 | 68 | |
17c76198 PP |
69 | Changes: |
70 | gnutls_certificate_verify_peers2(): is new, drop the 2 for old version | |
71 | */ | |
059ec3d9 | 72 | |
17c76198 | 73 | /* Local static variables for GnuTLS */ |
059ec3d9 | 74 | |
17c76198 | 75 | /* Values for verify_requirement */ |
059ec3d9 | 76 | |
e51c7be2 | 77 | enum peer_verify_requirement |
aa2a70ba | 78 | { VERIFY_NONE, VERIFY_OPTIONAL, VERIFY_REQUIRED }; |
059ec3d9 | 79 | |
17c76198 PP |
80 | /* This holds most state for server or client; with this, we can set up an |
81 | outbound TLS-enabled connection in an ACL callout, while not stomping all | |
82 | over the TLS variables available for expansion. | |
059ec3d9 | 83 | |
17c76198 PP |
84 | Some of these correspond to variables in globals.c; those variables will |
85 | be set to point to content in one of these instances, as appropriate for | |
86 | the stage of the process lifetime. | |
059ec3d9 | 87 | |
389ca47a | 88 | Not handled here: global tls_channelbinding_b64. |
17c76198 | 89 | */ |
059ec3d9 | 90 | |
17c76198 | 91 | typedef struct exim_gnutls_state { |
9d1c15ef | 92 | gnutls_session_t session; |
17c76198 | 93 | gnutls_certificate_credentials_t x509_cred; |
9d1c15ef | 94 | gnutls_priority_t priority_cache; |
17c76198 | 95 | enum peer_verify_requirement verify_requirement; |
9d1c15ef JH |
96 | int fd_in; |
97 | int fd_out; | |
98 | BOOL peer_cert_verified; | |
99 | BOOL trigger_sni_changes; | |
100 | BOOL have_set_peerdn; | |
17c76198 | 101 | const struct host_item *host; |
9d1c15ef JH |
102 | gnutls_x509_crt_t peercert; |
103 | uschar *peerdn; | |
104 | uschar *ciphersuite; | |
105 | uschar *received_sni; | |
17c76198 PP |
106 | |
107 | const uschar *tls_certificate; | |
108 | const uschar *tls_privatekey; | |
109 | const uschar *tls_sni; /* client send only, not received */ | |
110 | const uschar *tls_verify_certificates; | |
111 | const uschar *tls_crl; | |
112 | const uschar *tls_require_ciphers; | |
e51c7be2 | 113 | |
17c76198 PP |
114 | uschar *exp_tls_certificate; |
115 | uschar *exp_tls_privatekey; | |
17c76198 PP |
116 | uschar *exp_tls_verify_certificates; |
117 | uschar *exp_tls_crl; | |
118 | uschar *exp_tls_require_ciphers; | |
44662487 | 119 | uschar *exp_tls_ocsp_file; |
e51c7be2 JH |
120 | #ifdef EXPERIMENTAL_CERTNAMES |
121 | uschar *exp_tls_verify_cert_hostnames; | |
122 | #endif | |
774ef2d7 | 123 | #ifdef EXPERIMENTAL_EVENT |
a7538db1 JH |
124 | uschar *event_action; |
125 | #endif | |
17c76198 | 126 | |
389ca47a | 127 | tls_support *tlsp; /* set in tls_init() */ |
817d9f57 | 128 | |
17c76198 PP |
129 | uschar *xfer_buffer; |
130 | int xfer_buffer_lwm; | |
131 | int xfer_buffer_hwm; | |
132 | int xfer_eof; | |
133 | int xfer_error; | |
17c76198 PP |
134 | } exim_gnutls_state_st; |
135 | ||
136 | static const exim_gnutls_state_st exim_gnutls_state_init = { | |
4fe99a6c | 137 | NULL, NULL, NULL, VERIFY_NONE, -1, -1, FALSE, FALSE, FALSE, |
75fe387d | 138 | NULL, NULL, NULL, NULL, |
17c76198 | 139 | NULL, NULL, NULL, NULL, NULL, NULL, |
44662487 | 140 | NULL, NULL, NULL, NULL, NULL, NULL, NULL, |
e51c7be2 JH |
141 | #ifdef EXPERIMENTAL_CERTNAMES |
142 | NULL, | |
a7538db1 | 143 | #endif |
774ef2d7 | 144 | #ifdef EXPERIMENTAL_EVENT |
a7538db1 | 145 | NULL, |
e51c7be2 | 146 | #endif |
817d9f57 | 147 | NULL, |
17c76198 | 148 | NULL, 0, 0, 0, 0, |
17c76198 | 149 | }; |
83da1223 | 150 | |
17c76198 PP |
151 | /* Not only do we have our own APIs which don't pass around state, assuming |
152 | it's held in globals, GnuTLS doesn't appear to let us register callback data | |
153 | for callbacks, or as part of the session, so we have to keep a "this is the | |
154 | context we're currently dealing with" pointer and rely upon being | |
155 | single-threaded to keep from processing data on an inbound TLS connection while | |
156 | talking to another TLS connection for an outbound check. This does mean that | |
157 | there's no way for heart-beats to be responded to, for the duration of the | |
a7538db1 JH |
158 | second connection. |
159 | XXX But see gnutls_session_get_ptr() | |
160 | */ | |
059ec3d9 | 161 | |
17c76198 | 162 | static exim_gnutls_state_st state_server, state_client; |
059ec3d9 | 163 | |
17c76198 PP |
164 | /* dh_params are initialised once within the lifetime of a process using TLS; |
165 | if we used TLS in a long-lived daemon, we'd have to reconsider this. But we | |
166 | don't want to repeat this. */ | |
83da1223 | 167 | |
17c76198 | 168 | static gnutls_dh_params_t dh_server_params = NULL; |
059ec3d9 | 169 | |
17c76198 | 170 | /* No idea how this value was chosen; preserving it. Default is 3600. */ |
059ec3d9 | 171 | |
17c76198 | 172 | static const int ssl_session_timeout = 200; |
059ec3d9 | 173 | |
17c76198 | 174 | static const char * const exim_default_gnutls_priority = "NORMAL"; |
83da1223 | 175 | |
17c76198 | 176 | /* Guard library core initialisation */ |
83da1223 | 177 | |
17c76198 | 178 | static BOOL exim_gnutls_base_init_done = FALSE; |
059ec3d9 | 179 | |
059ec3d9 | 180 | |
17c76198 PP |
181 | /* ------------------------------------------------------------------------ */ |
182 | /* macros */ | |
83da1223 | 183 | |
17c76198 | 184 | #define MAX_HOST_LEN 255 |
83da1223 | 185 | |
17c76198 PP |
186 | /* Set this to control gnutls_global_set_log_level(); values 0 to 9 will setup |
187 | the library logging; a value less than 0 disables the calls to set up logging | |
188 | callbacks. */ | |
2c17bb02 | 189 | #ifndef EXIM_GNUTLS_LIBRARY_LOG_LEVEL |
a7538db1 | 190 | # define EXIM_GNUTLS_LIBRARY_LOG_LEVEL -1 |
2c17bb02 | 191 | #endif |
83da1223 | 192 | |
2c17bb02 | 193 | #ifndef EXIM_CLIENT_DH_MIN_BITS |
a7538db1 | 194 | # define EXIM_CLIENT_DH_MIN_BITS 1024 |
2c17bb02 | 195 | #endif |
83da1223 | 196 | |
af3498d6 PP |
197 | /* With GnuTLS 2.12.x+ we have gnutls_sec_param_to_pk_bits() with which we |
198 | can ask for a bit-strength. Without that, we stick to the constant we had | |
199 | before, for now. */ | |
2c17bb02 | 200 | #ifndef EXIM_SERVER_DH_BITS_PRE2_12 |
a7538db1 | 201 | # define EXIM_SERVER_DH_BITS_PRE2_12 1024 |
2c17bb02 | 202 | #endif |
af3498d6 | 203 | |
17c76198 PP |
204 | #define exim_gnutls_err_check(Label) do { \ |
205 | if (rc != GNUTLS_E_SUCCESS) { return tls_error((Label), gnutls_strerror(rc), host); } } while (0) | |
059ec3d9 | 206 | |
17c76198 | 207 | #define expand_check_tlsvar(Varname) expand_check(state->Varname, US #Varname, &state->exp_##Varname) |
83da1223 | 208 | |
17c76198 | 209 | #if GNUTLS_VERSION_NUMBER >= 0x020c00 |
e51c7be2 JH |
210 | # define HAVE_GNUTLS_SESSION_CHANNEL_BINDING |
211 | # define HAVE_GNUTLS_SEC_PARAM_CONSTANTS | |
212 | # define HAVE_GNUTLS_RND | |
2519e60d TL |
213 | /* The security fix we provide with the gnutls_allow_auto_pkcs11 option |
214 | * (4.82 PP/09) introduces a compatibility regression. The symbol simply | |
215 | * isn't available sometimes, so this needs to become a conditional | |
216 | * compilation; the sanest way to deal with this being a problem on | |
217 | * older OSes is to block it in the Local/Makefile with this compiler | |
218 | * definition */ | |
e51c7be2 JH |
219 | # ifndef AVOID_GNUTLS_PKCS11 |
220 | # define HAVE_GNUTLS_PKCS11 | |
221 | # endif /* AVOID_GNUTLS_PKCS11 */ | |
17c76198 | 222 | #endif |
83da1223 | 223 | |
af3498d6 PP |
224 | |
225 | ||
226 | ||
227 | /* ------------------------------------------------------------------------ */ | |
228 | /* Callback declarations */ | |
229 | ||
230 | #if EXIM_GNUTLS_LIBRARY_LOG_LEVEL >= 0 | |
231 | static void exim_gnutls_logger_cb(int level, const char *message); | |
232 | #endif | |
233 | ||
234 | static int exim_sni_handling_cb(gnutls_session_t session); | |
235 | ||
f2de3a33 | 236 | #ifndef DISABLE_OCSP |
44662487 JH |
237 | static int server_ocsp_stapling_cb(gnutls_session_t session, void * ptr, |
238 | gnutls_datum_t * ocsp_response); | |
239 | #endif | |
af3498d6 PP |
240 | |
241 | ||
242 | ||
17c76198 PP |
243 | /* ------------------------------------------------------------------------ */ |
244 | /* Static functions */ | |
059ec3d9 PH |
245 | |
246 | /************************************************* | |
247 | * Handle TLS error * | |
248 | *************************************************/ | |
249 | ||
250 | /* Called from lots of places when errors occur before actually starting to do | |
251 | the TLS handshake, that is, while the session is still in clear. Always returns | |
252 | DEFER for a server and FAIL for a client so that most calls can use "return | |
253 | tls_error(...)" to do this processing and then give an appropriate return. A | |
254 | single function is used for both server and client, because it is called from | |
255 | some shared functions. | |
256 | ||
257 | Argument: | |
258 | prefix text to include in the logged error | |
7199e1ee TF |
259 | msg additional error string (may be NULL) |
260 | usually obtained from gnutls_strerror() | |
17c76198 PP |
261 | host NULL if setting up a server; |
262 | the connected host if setting up a client | |
059ec3d9 PH |
263 | |
264 | Returns: OK/DEFER/FAIL | |
265 | */ | |
266 | ||
267 | static int | |
17c76198 | 268 | tls_error(const uschar *prefix, const char *msg, const host_item *host) |
059ec3d9 | 269 | { |
17c76198 PP |
270 | if (host) |
271 | { | |
c562fd30 | 272 | log_write(0, LOG_MAIN, "H=%s [%s] TLS error on connection (%s)%s%s", |
17c76198 PP |
273 | host->name, host->address, prefix, msg ? ": " : "", msg ? msg : ""); |
274 | return FAIL; | |
275 | } | |
276 | else | |
059ec3d9 | 277 | { |
7199e1ee | 278 | uschar *conn_info = smtp_get_connection_info(); |
17c76198 | 279 | if (Ustrncmp(conn_info, US"SMTP ", 5) == 0) |
7199e1ee | 280 | conn_info += 5; |
c562fd30 | 281 | /* I'd like to get separated H= here, but too hard for now */ |
7199e1ee | 282 | log_write(0, LOG_MAIN, "TLS error on %s (%s)%s%s", |
17c76198 | 283 | conn_info, prefix, msg ? ": " : "", msg ? msg : ""); |
059ec3d9 PH |
284 | return DEFER; |
285 | } | |
059ec3d9 PH |
286 | } |
287 | ||
288 | ||
289 | ||
17c76198 | 290 | |
059ec3d9 | 291 | /************************************************* |
17c76198 | 292 | * Deal with logging errors during I/O * |
059ec3d9 PH |
293 | *************************************************/ |
294 | ||
17c76198 | 295 | /* We have to get the identity of the peer from saved data. |
059ec3d9 | 296 | |
17c76198 PP |
297 | Argument: |
298 | state the current GnuTLS exim state container | |
299 | rc the GnuTLS error code, or 0 if it's a local error | |
300 | when text identifying read or write | |
301 | text local error text when ec is 0 | |
059ec3d9 | 302 | |
17c76198 | 303 | Returns: nothing |
059ec3d9 PH |
304 | */ |
305 | ||
17c76198 PP |
306 | static void |
307 | record_io_error(exim_gnutls_state_st *state, int rc, uschar *when, uschar *text) | |
059ec3d9 | 308 | { |
17c76198 | 309 | const char *msg; |
059ec3d9 | 310 | |
17c76198 PP |
311 | if (rc == GNUTLS_E_FATAL_ALERT_RECEIVED) |
312 | msg = CS string_sprintf("%s: %s", US gnutls_strerror(rc), | |
313 | US gnutls_alert_get_name(gnutls_alert_get(state->session))); | |
314 | else | |
315 | msg = gnutls_strerror(rc); | |
059ec3d9 | 316 | |
17c76198 PP |
317 | tls_error(when, msg, state->host); |
318 | } | |
059ec3d9 | 319 | |
059ec3d9 | 320 | |
059ec3d9 | 321 | |
059ec3d9 | 322 | |
17c76198 PP |
323 | /************************************************* |
324 | * Set various Exim expansion vars * | |
325 | *************************************************/ | |
059ec3d9 | 326 | |
e51c7be2 JH |
327 | #define exim_gnutls_cert_err(Label) \ |
328 | do \ | |
329 | { \ | |
330 | if (rc != GNUTLS_E_SUCCESS) \ | |
331 | { \ | |
332 | DEBUG(D_tls) debug_printf("TLS: cert problem: %s: %s\n", \ | |
333 | (Label), gnutls_strerror(rc)); \ | |
334 | return rc; \ | |
335 | } \ | |
336 | } while (0) | |
9d1c15ef JH |
337 | |
338 | static int | |
339 | import_cert(const gnutls_datum * cert, gnutls_x509_crt_t * crtp) | |
340 | { | |
341 | int rc; | |
342 | ||
343 | rc = gnutls_x509_crt_init(crtp); | |
344 | exim_gnutls_cert_err(US"gnutls_x509_crt_init (crt)"); | |
345 | ||
346 | rc = gnutls_x509_crt_import(*crtp, cert, GNUTLS_X509_FMT_DER); | |
347 | exim_gnutls_cert_err(US"failed to import certificate [gnutls_x509_crt_import(cert)]"); | |
348 | ||
349 | return rc; | |
350 | } | |
351 | ||
352 | #undef exim_gnutls_cert_err | |
353 | ||
354 | ||
17c76198 PP |
355 | /* We set various Exim global variables from the state, once a session has |
356 | been established. With TLS callouts, may need to change this to stack | |
357 | variables, or just re-call it with the server state after client callout | |
358 | has finished. | |
059ec3d9 | 359 | |
9d1c15ef | 360 | Make sure anything set here is unset in tls_getc(). |
17c76198 PP |
361 | |
362 | Sets: | |
363 | tls_active fd | |
364 | tls_bits strength indicator | |
365 | tls_certificate_verified bool indicator | |
366 | tls_channelbinding_b64 for some SASL mechanisms | |
367 | tls_cipher a string | |
9d1c15ef | 368 | tls_peercert pointer to library internal |
17c76198 PP |
369 | tls_peerdn a string |
370 | tls_sni a (UTF-8) string | |
9d1c15ef | 371 | tls_ourcert pointer to library internal |
17c76198 PP |
372 | |
373 | Argument: | |
374 | state the relevant exim_gnutls_state_st * | |
375 | */ | |
376 | ||
377 | static void | |
9d1c15ef | 378 | extract_exim_vars_from_tls_state(exim_gnutls_state_st * state) |
17c76198 | 379 | { |
17c76198 | 380 | gnutls_cipher_algorithm_t cipher; |
17c76198 PP |
381 | #ifdef HAVE_GNUTLS_SESSION_CHANNEL_BINDING |
382 | int old_pool; | |
383 | int rc; | |
384 | gnutls_datum_t channel; | |
385 | #endif | |
9d1c15ef | 386 | tls_support * tlsp = state->tlsp; |
17c76198 | 387 | |
9d1c15ef | 388 | tlsp->active = state->fd_out; |
17c76198 PP |
389 | |
390 | cipher = gnutls_cipher_get(state->session); | |
391 | /* returns size in "bytes" */ | |
9d1c15ef | 392 | tlsp->bits = gnutls_cipher_get_key_size(cipher) * 8; |
17c76198 | 393 | |
9d1c15ef | 394 | tlsp->cipher = state->ciphersuite; |
17c76198 | 395 | |
817d9f57 | 396 | DEBUG(D_tls) debug_printf("cipher: %s\n", state->ciphersuite); |
17c76198 | 397 | |
9d1c15ef | 398 | tlsp->certificate_verified = state->peer_cert_verified; |
059ec3d9 | 399 | |
17c76198 PP |
400 | /* note that tls_channelbinding_b64 is not saved to the spool file, since it's |
401 | only available for use for authenticators while this TLS session is running. */ | |
402 | ||
403 | tls_channelbinding_b64 = NULL; | |
404 | #ifdef HAVE_GNUTLS_SESSION_CHANNEL_BINDING | |
405 | channel.data = NULL; | |
406 | channel.size = 0; | |
407 | rc = gnutls_session_channel_binding(state->session, GNUTLS_CB_TLS_UNIQUE, &channel); | |
408 | if (rc) { | |
409 | DEBUG(D_tls) debug_printf("Channel binding error: %s\n", gnutls_strerror(rc)); | |
410 | } else { | |
411 | old_pool = store_pool; | |
412 | store_pool = POOL_PERM; | |
413 | tls_channelbinding_b64 = auth_b64encode(channel.data, (int)channel.size); | |
414 | store_pool = old_pool; | |
415 | DEBUG(D_tls) debug_printf("Have channel bindings cached for possible auth usage.\n"); | |
416 | } | |
417 | #endif | |
418 | ||
9d1c15ef JH |
419 | /* peercert is set in peer_status() */ |
420 | tlsp->peerdn = state->peerdn; | |
421 | tlsp->sni = state->received_sni; | |
422 | ||
423 | /* record our certificate */ | |
424 | { | |
425 | const gnutls_datum * cert = gnutls_certificate_get_ours(state->session); | |
426 | gnutls_x509_crt_t crt; | |
427 | ||
428 | tlsp->ourcert = cert && import_cert(cert, &crt)==0 ? crt : NULL; | |
429 | } | |
059ec3d9 PH |
430 | } |
431 | ||
432 | ||
433 | ||
17c76198 | 434 | |
059ec3d9 | 435 | /************************************************* |
575643cd | 436 | * Setup up DH parameters * |
059ec3d9 PH |
437 | *************************************************/ |
438 | ||
575643cd | 439 | /* Generating the D-H parameters may take a long time. They only need to |
059ec3d9 PH |
440 | be re-generated every so often, depending on security policy. What we do is to |
441 | keep these parameters in a file in the spool directory. If the file does not | |
442 | exist, we generate them. This means that it is easy to cause a regeneration. | |
443 | ||
444 | The new file is written as a temporary file and renamed, so that an incomplete | |
445 | file is never present. If two processes both compute some new parameters, you | |
446 | waste a bit of effort, but it doesn't seem worth messing around with locking to | |
447 | prevent this. | |
448 | ||
059ec3d9 PH |
449 | Returns: OK/DEFER/FAIL |
450 | */ | |
451 | ||
452 | static int | |
17c76198 | 453 | init_server_dh(void) |
059ec3d9 | 454 | { |
17c76198 PP |
455 | int fd, rc; |
456 | unsigned int dh_bits; | |
b5aea5e1 | 457 | gnutls_datum m; |
a799883d PP |
458 | uschar filename_buf[PATH_MAX]; |
459 | uschar *filename = NULL; | |
17c76198 | 460 | size_t sz; |
a799883d PP |
461 | uschar *exp_tls_dhparam; |
462 | BOOL use_file_in_spool = FALSE; | |
463 | BOOL use_fixed_file = FALSE; | |
17c76198 | 464 | host_item *host = NULL; /* dummy for macros */ |
059ec3d9 | 465 | |
17c76198 | 466 | DEBUG(D_tls) debug_printf("Initialising GnuTLS server params.\n"); |
059ec3d9 | 467 | |
17c76198 PP |
468 | rc = gnutls_dh_params_init(&dh_server_params); |
469 | exim_gnutls_err_check(US"gnutls_dh_params_init"); | |
059ec3d9 | 470 | |
a799883d PP |
471 | m.data = NULL; |
472 | m.size = 0; | |
473 | ||
474 | if (!expand_check(tls_dhparam, US"tls_dhparam", &exp_tls_dhparam)) | |
475 | return DEFER; | |
476 | ||
477 | if (!exp_tls_dhparam) | |
478 | { | |
479 | DEBUG(D_tls) debug_printf("Loading default hard-coded DH params\n"); | |
480 | m.data = US std_dh_prime_default(); | |
481 | m.size = Ustrlen(m.data); | |
482 | } | |
483 | else if (Ustrcmp(exp_tls_dhparam, "historic") == 0) | |
484 | use_file_in_spool = TRUE; | |
485 | else if (Ustrcmp(exp_tls_dhparam, "none") == 0) | |
486 | { | |
487 | DEBUG(D_tls) debug_printf("Requested no DH parameters.\n"); | |
488 | return OK; | |
489 | } | |
490 | else if (exp_tls_dhparam[0] != '/') | |
491 | { | |
492 | m.data = US std_dh_prime_named(exp_tls_dhparam); | |
493 | if (m.data == NULL) | |
494 | return tls_error(US"No standard prime named", CS exp_tls_dhparam, NULL); | |
495 | m.size = Ustrlen(m.data); | |
496 | } | |
497 | else | |
498 | { | |
499 | use_fixed_file = TRUE; | |
500 | filename = exp_tls_dhparam; | |
501 | } | |
502 | ||
503 | if (m.data) | |
504 | { | |
505 | rc = gnutls_dh_params_import_pkcs3(dh_server_params, &m, GNUTLS_X509_FMT_PEM); | |
506 | exim_gnutls_err_check(US"gnutls_dh_params_import_pkcs3"); | |
507 | DEBUG(D_tls) debug_printf("Loaded fixed standard D-H parameters\n"); | |
508 | return OK; | |
509 | } | |
510 | ||
af3498d6 PP |
511 | #ifdef HAVE_GNUTLS_SEC_PARAM_CONSTANTS |
512 | /* If you change this constant, also change dh_param_fn_ext so that we can use a | |
17c76198 PP |
513 | different filename and ensure we have sufficient bits. */ |
514 | dh_bits = gnutls_sec_param_to_pk_bits(GNUTLS_PK_DH, GNUTLS_SEC_PARAM_NORMAL); | |
515 | if (!dh_bits) | |
516 | return tls_error(US"gnutls_sec_param_to_pk_bits() failed", NULL, NULL); | |
af3498d6 | 517 | DEBUG(D_tls) |
b34fc30c | 518 | debug_printf("GnuTLS tells us that for D-H PK, NORMAL is %d bits.\n", |
af3498d6 PP |
519 | dh_bits); |
520 | #else | |
521 | dh_bits = EXIM_SERVER_DH_BITS_PRE2_12; | |
522 | DEBUG(D_tls) | |
523 | debug_printf("GnuTLS lacks gnutls_sec_param_to_pk_bits(), using %d bits.\n", | |
524 | dh_bits); | |
525 | #endif | |
059ec3d9 | 526 | |
3375e053 PP |
527 | /* Some clients have hard-coded limits. */ |
528 | if (dh_bits > tls_dh_max_bits) | |
529 | { | |
530 | DEBUG(D_tls) | |
531 | debug_printf("tls_dh_max_bits clamping override, using %d bits instead.\n", | |
532 | tls_dh_max_bits); | |
533 | dh_bits = tls_dh_max_bits; | |
534 | } | |
535 | ||
a799883d PP |
536 | if (use_file_in_spool) |
537 | { | |
538 | if (!string_format(filename_buf, sizeof(filename_buf), | |
539 | "%s/gnutls-params-%d", spool_directory, dh_bits)) | |
540 | return tls_error(US"overlong filename", NULL, NULL); | |
541 | filename = filename_buf; | |
542 | } | |
059ec3d9 | 543 | |
b5aea5e1 | 544 | /* Open the cache file for reading and if successful, read it and set up the |
575643cd | 545 | parameters. */ |
059ec3d9 PH |
546 | |
547 | fd = Uopen(filename, O_RDONLY, 0); | |
b5aea5e1 | 548 | if (fd >= 0) |
059ec3d9 | 549 | { |
b5aea5e1 | 550 | struct stat statbuf; |
17c76198 PP |
551 | FILE *fp; |
552 | int saved_errno; | |
553 | ||
554 | if (fstat(fd, &statbuf) < 0) /* EIO */ | |
555 | { | |
556 | saved_errno = errno; | |
557 | (void)close(fd); | |
558 | return tls_error(US"TLS cache stat failed", strerror(saved_errno), NULL); | |
559 | } | |
560 | if (!S_ISREG(statbuf.st_mode)) | |
b5aea5e1 PH |
561 | { |
562 | (void)close(fd); | |
17c76198 PP |
563 | return tls_error(US"TLS cache not a file", NULL, NULL); |
564 | } | |
565 | fp = fdopen(fd, "rb"); | |
566 | if (!fp) | |
567 | { | |
568 | saved_errno = errno; | |
569 | (void)close(fd); | |
570 | return tls_error(US"fdopen(TLS cache stat fd) failed", | |
571 | strerror(saved_errno), NULL); | |
b5aea5e1 | 572 | } |
059ec3d9 | 573 | |
b5aea5e1 PH |
574 | m.size = statbuf.st_size; |
575 | m.data = malloc(m.size); | |
576 | if (m.data == NULL) | |
17c76198 PP |
577 | { |
578 | fclose(fp); | |
579 | return tls_error(US"malloc failed", strerror(errno), NULL); | |
580 | } | |
581 | sz = fread(m.data, m.size, 1, fp); | |
582 | if (!sz) | |
583 | { | |
584 | saved_errno = errno; | |
585 | fclose(fp); | |
586 | free(m.data); | |
587 | return tls_error(US"fread failed", strerror(saved_errno), NULL); | |
588 | } | |
589 | fclose(fp); | |
b5aea5e1 | 590 | |
17c76198 | 591 | rc = gnutls_dh_params_import_pkcs3(dh_server_params, &m, GNUTLS_X509_FMT_PEM); |
b5aea5e1 | 592 | free(m.data); |
17c76198 PP |
593 | exim_gnutls_err_check(US"gnutls_dh_params_import_pkcs3"); |
594 | DEBUG(D_tls) debug_printf("read D-H parameters from file \"%s\"\n", filename); | |
b5aea5e1 PH |
595 | } |
596 | ||
597 | /* If the file does not exist, fall through to compute new data and cache it. | |
598 | If there was any other opening error, it is serious. */ | |
599 | ||
182ad5cf PH |
600 | else if (errno == ENOENT) |
601 | { | |
17c76198 | 602 | rc = -1; |
182ad5cf | 603 | DEBUG(D_tls) |
17c76198 | 604 | debug_printf("D-H parameter cache file \"%s\" does not exist\n", filename); |
182ad5cf PH |
605 | } |
606 | else | |
17c76198 PP |
607 | return tls_error(string_open_failed(errno, "\"%s\" for reading", filename), |
608 | NULL, NULL); | |
b5aea5e1 PH |
609 | |
610 | /* If ret < 0, either the cache file does not exist, or the data it contains | |
611 | is not useful. One particular case of this is when upgrading from an older | |
612 | release of Exim in which the data was stored in a different format. We don't | |
613 | try to be clever and support both formats; we just regenerate new data in this | |
614 | case. */ | |
615 | ||
17c76198 | 616 | if (rc < 0) |
b5aea5e1 | 617 | { |
17c76198 | 618 | uschar *temp_fn; |
201f5254 | 619 | unsigned int dh_bits_gen = dh_bits; |
059ec3d9 | 620 | |
17c76198 PP |
621 | if ((PATH_MAX - Ustrlen(filename)) < 10) |
622 | return tls_error(US"Filename too long to generate replacement", | |
623 | CS filename, NULL); | |
059ec3d9 | 624 | |
17c76198 PP |
625 | temp_fn = string_copy(US "%s.XXXXXXX"); |
626 | fd = mkstemp(CS temp_fn); /* modifies temp_fn */ | |
059ec3d9 | 627 | if (fd < 0) |
17c76198 | 628 | return tls_error(US"Unable to open temp file", strerror(errno), NULL); |
059ec3d9 PH |
629 | (void)fchown(fd, exim_uid, exim_gid); /* Probably not necessary */ |
630 | ||
201f5254 PP |
631 | /* GnuTLS overshoots! |
632 | * If we ask for 2236, we might get 2237 or more. | |
633 | * But there's no way to ask GnuTLS how many bits there really are. | |
634 | * We can ask how many bits were used in a TLS session, but that's it! | |
635 | * The prime itself is hidden behind too much abstraction. | |
636 | * So we ask for less, and proceed on a wing and a prayer. | |
637 | * First attempt, subtracted 3 for 2233 and got 2240. | |
638 | */ | |
cae6e576 | 639 | if (dh_bits >= EXIM_CLIENT_DH_MIN_BITS + 10) |
201f5254 PP |
640 | { |
641 | dh_bits_gen = dh_bits - 10; | |
642 | DEBUG(D_tls) | |
643 | debug_printf("being paranoid about DH generation, make it '%d' bits'\n", | |
644 | dh_bits_gen); | |
645 | } | |
646 | ||
647 | DEBUG(D_tls) | |
648 | debug_printf("requesting generation of %d bit Diffie-Hellman prime ...\n", | |
649 | dh_bits_gen); | |
650 | rc = gnutls_dh_params_generate2(dh_server_params, dh_bits_gen); | |
17c76198 PP |
651 | exim_gnutls_err_check(US"gnutls_dh_params_generate2"); |
652 | ||
653 | /* gnutls_dh_params_export_pkcs3() will tell us the exact size, every time, | |
654 | and I confirmed that a NULL call to get the size first is how the GnuTLS | |
655 | sample apps handle this. */ | |
656 | ||
657 | sz = 0; | |
658 | m.data = NULL; | |
659 | rc = gnutls_dh_params_export_pkcs3(dh_server_params, GNUTLS_X509_FMT_PEM, | |
660 | m.data, &sz); | |
661 | if (rc != GNUTLS_E_SHORT_MEMORY_BUFFER) | |
662 | exim_gnutls_err_check(US"gnutls_dh_params_export_pkcs3(NULL) sizing"); | |
663 | m.size = sz; | |
b5aea5e1 PH |
664 | m.data = malloc(m.size); |
665 | if (m.data == NULL) | |
17c76198 | 666 | return tls_error(US"memory allocation failed", strerror(errno), NULL); |
1f00591e | 667 | /* this will return a size 1 less than the allocation size above */ |
17c76198 | 668 | rc = gnutls_dh_params_export_pkcs3(dh_server_params, GNUTLS_X509_FMT_PEM, |
1f00591e | 669 | m.data, &sz); |
17c76198 PP |
670 | if (rc != GNUTLS_E_SUCCESS) |
671 | { | |
672 | free(m.data); | |
673 | exim_gnutls_err_check(US"gnutls_dh_params_export_pkcs3() real"); | |
674 | } | |
1f00591e | 675 | m.size = sz; /* shrink by 1, probably */ |
059ec3d9 | 676 | |
17c76198 PP |
677 | sz = write_to_fd_buf(fd, m.data, (size_t) m.size); |
678 | if (sz != m.size) | |
679 | { | |
680 | free(m.data); | |
681 | return tls_error(US"TLS cache write D-H params failed", | |
682 | strerror(errno), NULL); | |
683 | } | |
b5aea5e1 | 684 | free(m.data); |
17c76198 PP |
685 | sz = write_to_fd_buf(fd, US"\n", 1); |
686 | if (sz != 1) | |
687 | return tls_error(US"TLS cache write D-H params final newline failed", | |
688 | strerror(errno), NULL); | |
689 | ||
690 | rc = close(fd); | |
691 | if (rc) | |
692 | return tls_error(US"TLS cache write close() failed", | |
693 | strerror(errno), NULL); | |
059ec3d9 | 694 | |
17c76198 PP |
695 | if (Urename(temp_fn, filename) < 0) |
696 | return tls_error(string_sprintf("failed to rename \"%s\" as \"%s\"", | |
697 | temp_fn, filename), strerror(errno), NULL); | |
059ec3d9 | 698 | |
17c76198 | 699 | DEBUG(D_tls) debug_printf("wrote D-H parameters to file \"%s\"\n", filename); |
059ec3d9 PH |
700 | } |
701 | ||
17c76198 | 702 | DEBUG(D_tls) debug_printf("initialized server D-H parameters\n"); |
059ec3d9 PH |
703 | return OK; |
704 | } | |
705 | ||
706 | ||
707 | ||
708 | ||
709 | /************************************************* | |
17c76198 | 710 | * Variables re-expanded post-SNI * |
059ec3d9 PH |
711 | *************************************************/ |
712 | ||
17c76198 PP |
713 | /* Called from both server and client code, via tls_init(), and also from |
714 | the SNI callback after receiving an SNI, if tls_certificate includes "tls_sni". | |
715 | ||
716 | We can tell the two apart by state->received_sni being non-NULL in callback. | |
717 | ||
718 | The callback should not call us unless state->trigger_sni_changes is true, | |
719 | which we are responsible for setting on the first pass through. | |
059ec3d9 PH |
720 | |
721 | Arguments: | |
17c76198 | 722 | state exim_gnutls_state_st * |
059ec3d9 PH |
723 | |
724 | Returns: OK/DEFER/FAIL | |
725 | */ | |
726 | ||
727 | static int | |
17c76198 | 728 | tls_expand_session_files(exim_gnutls_state_st *state) |
059ec3d9 | 729 | { |
1365611d | 730 | struct stat statbuf; |
059ec3d9 | 731 | int rc; |
17c76198 PP |
732 | const host_item *host = state->host; /* macro should be reconsidered? */ |
733 | uschar *saved_tls_certificate = NULL; | |
734 | uschar *saved_tls_privatekey = NULL; | |
735 | uschar *saved_tls_verify_certificates = NULL; | |
736 | uschar *saved_tls_crl = NULL; | |
737 | int cert_count; | |
738 | ||
739 | /* We check for tls_sni *before* expansion. */ | |
2b4a568d | 740 | if (!host) /* server */ |
17c76198 PP |
741 | { |
742 | if (!state->received_sni) | |
743 | { | |
d9b2312b JH |
744 | if (state->tls_certificate && |
745 | (Ustrstr(state->tls_certificate, US"tls_sni") || | |
746 | Ustrstr(state->tls_certificate, US"tls_in_sni") || | |
747 | Ustrstr(state->tls_certificate, US"tls_out_sni") | |
748 | )) | |
17c76198 PP |
749 | { |
750 | DEBUG(D_tls) debug_printf("We will re-expand TLS session files if we receive SNI.\n"); | |
751 | state->trigger_sni_changes = TRUE; | |
752 | } | |
753 | } | |
754 | else | |
755 | { | |
1365611d | 756 | /* useful for debugging */ |
17c76198 PP |
757 | saved_tls_certificate = state->exp_tls_certificate; |
758 | saved_tls_privatekey = state->exp_tls_privatekey; | |
759 | saved_tls_verify_certificates = state->exp_tls_verify_certificates; | |
760 | saved_tls_crl = state->exp_tls_crl; | |
761 | } | |
762 | } | |
059ec3d9 | 763 | |
1365611d PP |
764 | rc = gnutls_certificate_allocate_credentials(&state->x509_cred); |
765 | exim_gnutls_err_check(US"gnutls_certificate_allocate_credentials"); | |
766 | ||
17c76198 PP |
767 | /* remember: expand_check_tlsvar() is expand_check() but fiddling with |
768 | state members, assuming consistent naming; and expand_check() returns | |
769 | false if expansion failed, unless expansion was forced to fail. */ | |
059ec3d9 | 770 | |
17c76198 PP |
771 | /* check if we at least have a certificate, before doing expensive |
772 | D-H generation. */ | |
059ec3d9 | 773 | |
17c76198 PP |
774 | if (!expand_check_tlsvar(tls_certificate)) |
775 | return DEFER; | |
059ec3d9 | 776 | |
17c76198 | 777 | /* certificate is mandatory in server, optional in client */ |
059ec3d9 | 778 | |
17c76198 PP |
779 | if ((state->exp_tls_certificate == NULL) || |
780 | (*state->exp_tls_certificate == '\0')) | |
781 | { | |
2b4a568d | 782 | if (!host) |
17c76198 PP |
783 | return tls_error(US"no TLS server certificate is specified", NULL, NULL); |
784 | else | |
785 | DEBUG(D_tls) debug_printf("TLS: no client certificate specified; okay\n"); | |
786 | } | |
059ec3d9 | 787 | |
17c76198 | 788 | if (state->tls_privatekey && !expand_check_tlsvar(tls_privatekey)) |
059ec3d9 PH |
789 | return DEFER; |
790 | ||
17c76198 PP |
791 | /* tls_privatekey is optional, defaulting to same file as certificate */ |
792 | ||
793 | if (state->tls_privatekey == NULL || *state->tls_privatekey == '\0') | |
059ec3d9 | 794 | { |
17c76198 PP |
795 | state->tls_privatekey = state->tls_certificate; |
796 | state->exp_tls_privatekey = state->exp_tls_certificate; | |
059ec3d9 | 797 | } |
c91535f3 | 798 | |
059ec3d9 | 799 | |
17c76198 | 800 | if (state->exp_tls_certificate && *state->exp_tls_certificate) |
059ec3d9 PH |
801 | { |
802 | DEBUG(D_tls) debug_printf("certificate file = %s\nkey file = %s\n", | |
17c76198 PP |
803 | state->exp_tls_certificate, state->exp_tls_privatekey); |
804 | ||
805 | if (state->received_sni) | |
de365ded | 806 | { |
17c76198 PP |
807 | if ((Ustrcmp(state->exp_tls_certificate, saved_tls_certificate) == 0) && |
808 | (Ustrcmp(state->exp_tls_privatekey, saved_tls_privatekey) == 0)) | |
809 | { | |
b34fc30c | 810 | DEBUG(D_tls) debug_printf("TLS SNI: cert and key unchanged\n"); |
17c76198 PP |
811 | } |
812 | else | |
813 | { | |
b34fc30c | 814 | DEBUG(D_tls) debug_printf("TLS SNI: have a changed cert/key pair.\n"); |
17c76198 | 815 | } |
8e669ac1 | 816 | } |
059ec3d9 | 817 | |
1365611d PP |
818 | rc = gnutls_certificate_set_x509_key_file(state->x509_cred, |
819 | CS state->exp_tls_certificate, CS state->exp_tls_privatekey, | |
820 | GNUTLS_X509_FMT_PEM); | |
821 | exim_gnutls_err_check( | |
822 | string_sprintf("cert/key setup: cert=%s key=%s", | |
823 | state->exp_tls_certificate, state->exp_tls_privatekey)); | |
824 | DEBUG(D_tls) debug_printf("TLS: cert/key registered\n"); | |
b34fc30c | 825 | } /* tls_certificate */ |
059ec3d9 | 826 | |
2b4a568d JH |
827 | |
828 | /* Set the OCSP stapling server info */ | |
829 | ||
f2de3a33 | 830 | #ifndef DISABLE_OCSP |
2b4a568d JH |
831 | if ( !host /* server */ |
832 | && tls_ocsp_file | |
833 | ) | |
834 | { | |
44662487 JH |
835 | if (!expand_check(tls_ocsp_file, US"tls_ocsp_file", |
836 | &state->exp_tls_ocsp_file)) | |
2b4a568d JH |
837 | return DEFER; |
838 | ||
44662487 JH |
839 | /* Use the full callback method for stapling just to get observability. |
840 | More efficient would be to read the file once only, if it never changed | |
841 | (due to SNI). Would need restart on file update, or watch datestamp. */ | |
842 | ||
843 | gnutls_certificate_set_ocsp_status_request_function(state->x509_cred, | |
844 | server_ocsp_stapling_cb, state->exp_tls_ocsp_file); | |
2b4a568d | 845 | |
44662487 | 846 | DEBUG(D_tls) debug_printf("Set OCSP response file %s\n", &state->exp_tls_ocsp_file); |
2b4a568d JH |
847 | } |
848 | #endif | |
849 | ||
850 | ||
059ec3d9 PH |
851 | /* Set the trusted CAs file if one is provided, and then add the CRL if one is |
852 | provided. Experiment shows that, if the certificate file is empty, an unhelpful | |
853 | error message is provided. However, if we just refrain from setting anything up | |
854 | in that case, certificate verification fails, which seems to be the correct | |
855 | behaviour. */ | |
856 | ||
17c76198 | 857 | if (state->tls_verify_certificates && *state->tls_verify_certificates) |
059ec3d9 | 858 | { |
17c76198 | 859 | if (!expand_check_tlsvar(tls_verify_certificates)) |
059ec3d9 | 860 | return DEFER; |
17c76198 PP |
861 | if (state->tls_crl && *state->tls_crl) |
862 | if (!expand_check_tlsvar(tls_crl)) | |
863 | return DEFER; | |
059ec3d9 | 864 | |
1365611d PP |
865 | if (!(state->exp_tls_verify_certificates && |
866 | *state->exp_tls_verify_certificates)) | |
b34fc30c PP |
867 | { |
868 | DEBUG(D_tls) | |
1365611d PP |
869 | debug_printf("TLS: tls_verify_certificates expanded empty, ignoring\n"); |
870 | /* With no tls_verify_certificates, we ignore tls_crl too */ | |
17c76198 | 871 | return OK; |
b34fc30c | 872 | } |
1365611d | 873 | } |
83e2f8a2 PP |
874 | else |
875 | { | |
876 | DEBUG(D_tls) | |
877 | debug_printf("TLS: tls_verify_certificates not set or empty, ignoring\n"); | |
878 | return OK; | |
879 | } | |
17c76198 | 880 | |
1365611d PP |
881 | if (Ustat(state->exp_tls_verify_certificates, &statbuf) < 0) |
882 | { | |
883 | log_write(0, LOG_MAIN|LOG_PANIC, "could not stat %s " | |
884 | "(tls_verify_certificates): %s", state->exp_tls_verify_certificates, | |
885 | strerror(errno)); | |
886 | return DEFER; | |
887 | } | |
17c76198 | 888 | |
a7fec7a7 | 889 | #ifndef SUPPORT_CA_DIR |
619b2b25 PP |
890 | /* The test suite passes in /dev/null; we could check for that path explicitly, |
891 | but who knows if someone has some weird FIFO which always dumps some certs, or | |
892 | other weirdness. The thing we really want to check is that it's not a | |
893 | directory, since while OpenSSL supports that, GnuTLS does not. | |
894 | So s/!S_ISREG/S_ISDIR/ and change some messsaging ... */ | |
895 | if (S_ISDIR(statbuf.st_mode)) | |
1365611d PP |
896 | { |
897 | DEBUG(D_tls) | |
619b2b25 PP |
898 | debug_printf("verify certificates path is a dir: \"%s\"\n", |
899 | state->exp_tls_verify_certificates); | |
1365611d | 900 | log_write(0, LOG_MAIN|LOG_PANIC, |
619b2b25 | 901 | "tls_verify_certificates \"%s\" is a directory", |
1365611d PP |
902 | state->exp_tls_verify_certificates); |
903 | return DEFER; | |
904 | } | |
a7fec7a7 | 905 | #endif |
059ec3d9 | 906 | |
1365611d PP |
907 | DEBUG(D_tls) debug_printf("verify certificates = %s size=" OFF_T_FMT "\n", |
908 | state->exp_tls_verify_certificates, statbuf.st_size); | |
059ec3d9 | 909 | |
1365611d PP |
910 | if (statbuf.st_size == 0) |
911 | { | |
912 | DEBUG(D_tls) | |
913 | debug_printf("cert file empty, no certs, no verification, ignoring any CRL\n"); | |
914 | return OK; | |
915 | } | |
059ec3d9 | 916 | |
a7fec7a7 JH |
917 | cert_count = |
918 | ||
919 | #ifdef SUPPORT_CA_DIR | |
920 | (statbuf.st_mode & S_IFMT) == S_IFDIR | |
921 | ? | |
922 | gnutls_certificate_set_x509_trust_dir(state->x509_cred, | |
923 | CS state->exp_tls_verify_certificates, GNUTLS_X509_FMT_PEM) | |
924 | : | |
925 | #endif | |
926 | gnutls_certificate_set_x509_trust_file(state->x509_cred, | |
1365611d | 927 | CS state->exp_tls_verify_certificates, GNUTLS_X509_FMT_PEM); |
a7fec7a7 | 928 | |
1365611d PP |
929 | if (cert_count < 0) |
930 | { | |
931 | rc = cert_count; | |
932 | exim_gnutls_err_check(US"gnutls_certificate_set_x509_trust_file"); | |
933 | } | |
934 | DEBUG(D_tls) debug_printf("Added %d certificate authorities.\n", cert_count); | |
059ec3d9 | 935 | |
5c8cda3a PP |
936 | if (state->tls_crl && *state->tls_crl && |
937 | state->exp_tls_crl && *state->exp_tls_crl) | |
1365611d | 938 | { |
5c8cda3a PP |
939 | DEBUG(D_tls) debug_printf("loading CRL file = %s\n", state->exp_tls_crl); |
940 | cert_count = gnutls_certificate_set_x509_crl_file(state->x509_cred, | |
941 | CS state->exp_tls_crl, GNUTLS_X509_FMT_PEM); | |
942 | if (cert_count < 0) | |
1365611d | 943 | { |
5c8cda3a | 944 | rc = cert_count; |
1365611d PP |
945 | exim_gnutls_err_check(US"gnutls_certificate_set_x509_crl_file"); |
946 | } | |
5c8cda3a | 947 | DEBUG(D_tls) debug_printf("Processed %d CRLs.\n", cert_count); |
1365611d | 948 | } |
059ec3d9 | 949 | |
059ec3d9 PH |
950 | return OK; |
951 | } | |
952 | ||
953 | ||
954 | ||
955 | ||
1365611d PP |
956 | /************************************************* |
957 | * Set X.509 state variables * | |
958 | *************************************************/ | |
959 | ||
960 | /* In GnuTLS, the registered cert/key are not replaced by a later | |
961 | set of a cert/key, so for SNI support we need a whole new x509_cred | |
962 | structure. Which means various other non-re-expanded pieces of state | |
963 | need to be re-set in the new struct, so the setting logic is pulled | |
964 | out to this. | |
965 | ||
966 | Arguments: | |
967 | state exim_gnutls_state_st * | |
968 | ||
969 | Returns: OK/DEFER/FAIL | |
970 | */ | |
971 | ||
972 | static int | |
973 | tls_set_remaining_x509(exim_gnutls_state_st *state) | |
974 | { | |
975 | int rc; | |
976 | const host_item *host = state->host; /* macro should be reconsidered? */ | |
977 | ||
978 | /* Create D-H parameters, or read them from the cache file. This function does | |
979 | its own SMTP error messaging. This only happens for the server, TLS D-H ignores | |
980 | client-side params. */ | |
981 | ||
982 | if (!state->host) | |
983 | { | |
984 | if (!dh_server_params) | |
985 | { | |
986 | rc = init_server_dh(); | |
987 | if (rc != OK) return rc; | |
988 | } | |
989 | gnutls_certificate_set_dh_params(state->x509_cred, dh_server_params); | |
990 | } | |
991 | ||
992 | /* Link the credentials to the session. */ | |
993 | ||
994 | rc = gnutls_credentials_set(state->session, GNUTLS_CRD_CERTIFICATE, state->x509_cred); | |
995 | exim_gnutls_err_check(US"gnutls_credentials_set"); | |
996 | ||
997 | return OK; | |
998 | } | |
999 | ||
059ec3d9 | 1000 | /************************************************* |
17c76198 | 1001 | * Initialize for GnuTLS * |
059ec3d9 PH |
1002 | *************************************************/ |
1003 | ||
17c76198 PP |
1004 | /* Called from both server and client code. In the case of a server, errors |
1005 | before actual TLS negotiation return DEFER. | |
059ec3d9 PH |
1006 | |
1007 | Arguments: | |
17c76198 PP |
1008 | host connected host, if client; NULL if server |
1009 | certificate certificate file | |
1010 | privatekey private key file | |
1011 | sni TLS SNI to send, sometimes when client; else NULL | |
1012 | cas CA certs file | |
1013 | crl CRL file | |
1014 | require_ciphers tls_require_ciphers setting | |
817d9f57 | 1015 | caller_state returned state-info structure |
059ec3d9 | 1016 | |
17c76198 | 1017 | Returns: OK/DEFER/FAIL |
059ec3d9 PH |
1018 | */ |
1019 | ||
17c76198 PP |
1020 | static int |
1021 | tls_init( | |
1022 | const host_item *host, | |
1023 | const uschar *certificate, | |
1024 | const uschar *privatekey, | |
1025 | const uschar *sni, | |
1026 | const uschar *cas, | |
1027 | const uschar *crl, | |
1028 | const uschar *require_ciphers, | |
1029 | exim_gnutls_state_st **caller_state) | |
059ec3d9 | 1030 | { |
17c76198 PP |
1031 | exim_gnutls_state_st *state; |
1032 | int rc; | |
1033 | size_t sz; | |
1034 | const char *errpos; | |
1035 | uschar *p; | |
1036 | BOOL want_default_priorities; | |
1037 | ||
1038 | if (!exim_gnutls_base_init_done) | |
059ec3d9 | 1039 | { |
17c76198 PP |
1040 | DEBUG(D_tls) debug_printf("GnuTLS global init required.\n"); |
1041 | ||
a5f239e4 PP |
1042 | #ifdef HAVE_GNUTLS_PKCS11 |
1043 | /* By default, gnutls_global_init will init PKCS11 support in auto mode, | |
1044 | which loads modules from a config file, which sounds good and may be wanted | |
1045 | by some sysadmin, but also means in common configurations that GNOME keyring | |
1046 | environment variables are used and so breaks for users calling mailq. | |
1047 | To prevent this, we init PKCS11 first, which is the documented approach. */ | |
2519e60d | 1048 | if (!gnutls_allow_auto_pkcs11) |
a5f239e4 PP |
1049 | { |
1050 | rc = gnutls_pkcs11_init(GNUTLS_PKCS11_FLAG_MANUAL, NULL); | |
1051 | exim_gnutls_err_check(US"gnutls_pkcs11_init"); | |
1052 | } | |
1053 | #endif | |
1054 | ||
17c76198 PP |
1055 | rc = gnutls_global_init(); |
1056 | exim_gnutls_err_check(US"gnutls_global_init"); | |
1057 | ||
1058 | #if EXIM_GNUTLS_LIBRARY_LOG_LEVEL >= 0 | |
1059 | DEBUG(D_tls) | |
059ec3d9 | 1060 | { |
17c76198 PP |
1061 | gnutls_global_set_log_function(exim_gnutls_logger_cb); |
1062 | /* arbitrarily chosen level; bump upto 9 for more */ | |
1063 | gnutls_global_set_log_level(EXIM_GNUTLS_LIBRARY_LOG_LEVEL); | |
059ec3d9 | 1064 | } |
17c76198 PP |
1065 | #endif |
1066 | ||
1067 | exim_gnutls_base_init_done = TRUE; | |
059ec3d9 | 1068 | } |
059ec3d9 | 1069 | |
17c76198 PP |
1070 | if (host) |
1071 | { | |
1072 | state = &state_client; | |
1073 | memcpy(state, &exim_gnutls_state_init, sizeof(exim_gnutls_state_init)); | |
817d9f57 | 1074 | state->tlsp = &tls_out; |
17c76198 PP |
1075 | DEBUG(D_tls) debug_printf("initialising GnuTLS client session\n"); |
1076 | rc = gnutls_init(&state->session, GNUTLS_CLIENT); | |
1077 | } | |
1078 | else | |
1079 | { | |
1080 | state = &state_server; | |
1081 | memcpy(state, &exim_gnutls_state_init, sizeof(exim_gnutls_state_init)); | |
817d9f57 | 1082 | state->tlsp = &tls_in; |
17c76198 PP |
1083 | DEBUG(D_tls) debug_printf("initialising GnuTLS server session\n"); |
1084 | rc = gnutls_init(&state->session, GNUTLS_SERVER); | |
1085 | } | |
1086 | exim_gnutls_err_check(US"gnutls_init"); | |
059ec3d9 | 1087 | |
17c76198 | 1088 | state->host = host; |
059ec3d9 | 1089 | |
17c76198 PP |
1090 | state->tls_certificate = certificate; |
1091 | state->tls_privatekey = privatekey; | |
5779e6aa | 1092 | state->tls_require_ciphers = require_ciphers; |
17c76198 PP |
1093 | state->tls_sni = sni; |
1094 | state->tls_verify_certificates = cas; | |
1095 | state->tls_crl = crl; | |
059ec3d9 | 1096 | |
17c76198 PP |
1097 | /* This handles the variables that might get re-expanded after TLS SNI; |
1098 | that's tls_certificate, tls_privatekey, tls_verify_certificates, tls_crl */ | |
059ec3d9 | 1099 | |
17c76198 PP |
1100 | DEBUG(D_tls) |
1101 | debug_printf("Expanding various TLS configuration options for session credentials.\n"); | |
1102 | rc = tls_expand_session_files(state); | |
1103 | if (rc != OK) return rc; | |
059ec3d9 | 1104 | |
1365611d PP |
1105 | /* These are all other parts of the x509_cred handling, since SNI in GnuTLS |
1106 | requires a new structure afterwards. */ | |
83da1223 | 1107 | |
1365611d PP |
1108 | rc = tls_set_remaining_x509(state); |
1109 | if (rc != OK) return rc; | |
83da1223 | 1110 | |
17c76198 PP |
1111 | /* set SNI in client, only */ |
1112 | if (host) | |
1113 | { | |
0df4ab80 | 1114 | if (!expand_check(sni, US"tls_out_sni", &state->tlsp->sni)) |
17c76198 | 1115 | return DEFER; |
0df4ab80 | 1116 | if (state->tlsp->sni && *state->tlsp->sni) |
17c76198 PP |
1117 | { |
1118 | DEBUG(D_tls) | |
0df4ab80 JH |
1119 | debug_printf("Setting TLS client SNI to \"%s\"\n", state->tlsp->sni); |
1120 | sz = Ustrlen(state->tlsp->sni); | |
17c76198 | 1121 | rc = gnutls_server_name_set(state->session, |
0df4ab80 | 1122 | GNUTLS_NAME_DNS, state->tlsp->sni, sz); |
17c76198 PP |
1123 | exim_gnutls_err_check(US"gnutls_server_name_set"); |
1124 | } | |
1125 | } | |
1126 | else if (state->tls_sni) | |
1127 | DEBUG(D_tls) debug_printf("*** PROBABLY A BUG *** " \ | |
1128 | "have an SNI set for a client [%s]\n", state->tls_sni); | |
83da1223 | 1129 | |
17c76198 | 1130 | /* This is the priority string support, |
42bfef1e | 1131 | http://www.gnutls.org/manual/html_node/Priority-Strings.html |
17c76198 PP |
1132 | and replaces gnutls_require_kx, gnutls_require_mac & gnutls_require_protocols. |
1133 | This was backwards incompatible, but means Exim no longer needs to track | |
1134 | all algorithms and provide string forms for them. */ | |
83da1223 | 1135 | |
17c76198 | 1136 | want_default_priorities = TRUE; |
83da1223 | 1137 | |
17c76198 | 1138 | if (state->tls_require_ciphers && *state->tls_require_ciphers) |
83da1223 | 1139 | { |
17c76198 PP |
1140 | if (!expand_check_tlsvar(tls_require_ciphers)) |
1141 | return DEFER; | |
1142 | if (state->exp_tls_require_ciphers && *state->exp_tls_require_ciphers) | |
83da1223 | 1143 | { |
17c76198 PP |
1144 | DEBUG(D_tls) debug_printf("GnuTLS session cipher/priority \"%s\"\n", |
1145 | state->exp_tls_require_ciphers); | |
1146 | ||
1147 | rc = gnutls_priority_init(&state->priority_cache, | |
1148 | CS state->exp_tls_require_ciphers, &errpos); | |
1149 | want_default_priorities = FALSE; | |
1150 | p = state->exp_tls_require_ciphers; | |
83da1223 PH |
1151 | } |
1152 | } | |
17c76198 PP |
1153 | if (want_default_priorities) |
1154 | { | |
83e2f8a2 PP |
1155 | DEBUG(D_tls) |
1156 | debug_printf("GnuTLS using default session cipher/priority \"%s\"\n", | |
1157 | exim_default_gnutls_priority); | |
17c76198 PP |
1158 | rc = gnutls_priority_init(&state->priority_cache, |
1159 | exim_default_gnutls_priority, &errpos); | |
1160 | p = US exim_default_gnutls_priority; | |
1161 | } | |
83da1223 | 1162 | |
17c76198 PP |
1163 | exim_gnutls_err_check(string_sprintf( |
1164 | "gnutls_priority_init(%s) failed at offset %ld, \"%.6s..\"", | |
1165 | p, errpos - CS p, errpos)); | |
1166 | ||
1167 | rc = gnutls_priority_set(state->session, state->priority_cache); | |
1168 | exim_gnutls_err_check(US"gnutls_priority_set"); | |
1169 | ||
1170 | gnutls_db_set_cache_expiration(state->session, ssl_session_timeout); | |
1171 | ||
1172 | /* Reduce security in favour of increased compatibility, if the admin | |
1173 | decides to make that trade-off. */ | |
1174 | if (gnutls_compat_mode) | |
83da1223 | 1175 | { |
17c76198 PP |
1176 | #if LIBGNUTLS_VERSION_NUMBER >= 0x020104 |
1177 | DEBUG(D_tls) debug_printf("lowering GnuTLS security, compatibility mode\n"); | |
1178 | gnutls_session_enable_compatibility_mode(state->session); | |
1179 | #else | |
1180 | DEBUG(D_tls) debug_printf("Unable to set gnutls_compat_mode - GnuTLS version too old\n"); | |
1181 | #endif | |
83da1223 PH |
1182 | } |
1183 | ||
17c76198 | 1184 | *caller_state = state; |
17c76198 | 1185 | return OK; |
83da1223 PH |
1186 | } |
1187 | ||
1188 | ||
1189 | ||
059ec3d9 | 1190 | /************************************************* |
17c76198 | 1191 | * Extract peer information * |
059ec3d9 PH |
1192 | *************************************************/ |
1193 | ||
17c76198 | 1194 | /* Called from both server and client code. |
4fe99a6c PP |
1195 | Only this is allowed to set state->peerdn and state->have_set_peerdn |
1196 | and we use that to detect double-calls. | |
059ec3d9 | 1197 | |
75fe387d PP |
1198 | NOTE: the state blocks last while the TLS connection is up, which is fine |
1199 | for logging in the server side, but for the client side, we log after teardown | |
1200 | in src/deliver.c. While the session is up, we can twist about states and | |
1201 | repoint tls_* globals, but those variables used for logging or other variable | |
1202 | expansion that happens _after_ delivery need to have a longer life-time. | |
1203 | ||
1204 | So for those, we get the data from POOL_PERM; the re-invoke guard keeps us from | |
1205 | doing this more than once per generation of a state context. We set them in | |
1206 | the state context, and repoint tls_* to them. After the state goes away, the | |
1207 | tls_* copies of the pointers remain valid and client delivery logging is happy. | |
1208 | ||
1209 | tls_certificate_verified is a BOOL, so the tls_peerdn and tls_cipher issues | |
1210 | don't apply. | |
1211 | ||
059ec3d9 | 1212 | Arguments: |
17c76198 | 1213 | state exim_gnutls_state_st * |
059ec3d9 | 1214 | |
17c76198 | 1215 | Returns: OK/DEFER/FAIL |
059ec3d9 PH |
1216 | */ |
1217 | ||
17c76198 PP |
1218 | static int |
1219 | peer_status(exim_gnutls_state_st *state) | |
059ec3d9 | 1220 | { |
75fe387d | 1221 | uschar cipherbuf[256]; |
17c76198 | 1222 | const gnutls_datum *cert_list; |
75fe387d | 1223 | int old_pool, rc; |
17c76198 | 1224 | unsigned int cert_list_size = 0; |
4fe99a6c PP |
1225 | gnutls_protocol_t protocol; |
1226 | gnutls_cipher_algorithm_t cipher; | |
1227 | gnutls_kx_algorithm_t kx; | |
1228 | gnutls_mac_algorithm_t mac; | |
17c76198 PP |
1229 | gnutls_certificate_type_t ct; |
1230 | gnutls_x509_crt_t crt; | |
4fe99a6c | 1231 | uschar *p, *dn_buf; |
17c76198 | 1232 | size_t sz; |
059ec3d9 | 1233 | |
4fe99a6c | 1234 | if (state->have_set_peerdn) |
17c76198 | 1235 | return OK; |
4fe99a6c | 1236 | state->have_set_peerdn = TRUE; |
059ec3d9 | 1237 | |
4fe99a6c | 1238 | state->peerdn = NULL; |
059ec3d9 | 1239 | |
4fe99a6c PP |
1240 | /* tls_cipher */ |
1241 | cipher = gnutls_cipher_get(state->session); | |
1242 | protocol = gnutls_protocol_get_version(state->session); | |
1243 | mac = gnutls_mac_get(state->session); | |
1244 | kx = gnutls_kx_get(state->session); | |
1245 | ||
75fe387d | 1246 | string_format(cipherbuf, sizeof(cipherbuf), |
4fe99a6c PP |
1247 | "%s:%s:%d", |
1248 | gnutls_protocol_get_name(protocol), | |
1249 | gnutls_cipher_suite_get_name(kx, cipher, mac), | |
1250 | (int) gnutls_cipher_get_key_size(cipher) * 8); | |
1251 | ||
1252 | /* I don't see a way that spaces could occur, in the current GnuTLS | |
1253 | code base, but it was a concern in the old code and perhaps older GnuTLS | |
1254 | releases did return "TLS 1.0"; play it safe, just in case. */ | |
75fe387d | 1255 | for (p = cipherbuf; *p != '\0'; ++p) |
4fe99a6c PP |
1256 | if (isspace(*p)) |
1257 | *p = '-'; | |
75fe387d PP |
1258 | old_pool = store_pool; |
1259 | store_pool = POOL_PERM; | |
1260 | state->ciphersuite = string_copy(cipherbuf); | |
1261 | store_pool = old_pool; | |
817d9f57 | 1262 | state->tlsp->cipher = state->ciphersuite; |
4fe99a6c PP |
1263 | |
1264 | /* tls_peerdn */ | |
17c76198 | 1265 | cert_list = gnutls_certificate_get_peers(state->session, &cert_list_size); |
83da1223 | 1266 | |
17c76198 PP |
1267 | if (cert_list == NULL || cert_list_size == 0) |
1268 | { | |
17c76198 PP |
1269 | DEBUG(D_tls) debug_printf("TLS: no certificate from peer (%p & %d)\n", |
1270 | cert_list, cert_list_size); | |
e51c7be2 | 1271 | if (state->verify_requirement >= VERIFY_REQUIRED) |
17c76198 PP |
1272 | return tls_error(US"certificate verification failed", |
1273 | "no certificate received from peer", state->host); | |
1274 | return OK; | |
1275 | } | |
059ec3d9 | 1276 | |
17c76198 PP |
1277 | ct = gnutls_certificate_type_get(state->session); |
1278 | if (ct != GNUTLS_CRT_X509) | |
059ec3d9 | 1279 | { |
17c76198 | 1280 | const char *ctn = gnutls_certificate_type_get_name(ct); |
17c76198 PP |
1281 | DEBUG(D_tls) |
1282 | debug_printf("TLS: peer cert not X.509 but instead \"%s\"\n", ctn); | |
e51c7be2 | 1283 | if (state->verify_requirement >= VERIFY_REQUIRED) |
17c76198 PP |
1284 | return tls_error(US"certificate verification not possible, unhandled type", |
1285 | ctn, state->host); | |
1286 | return OK; | |
83da1223 | 1287 | } |
059ec3d9 | 1288 | |
e51c7be2 JH |
1289 | #define exim_gnutls_peer_err(Label) \ |
1290 | do { \ | |
1291 | if (rc != GNUTLS_E_SUCCESS) \ | |
1292 | { \ | |
1293 | DEBUG(D_tls) debug_printf("TLS: peer cert problem: %s: %s\n", \ | |
1294 | (Label), gnutls_strerror(rc)); \ | |
1295 | if (state->verify_requirement >= VERIFY_REQUIRED) \ | |
1296 | return tls_error((Label), gnutls_strerror(rc), state->host); \ | |
1297 | return OK; \ | |
1298 | } \ | |
1299 | } while (0) | |
17c76198 | 1300 | |
9d1c15ef JH |
1301 | rc = import_cert(&cert_list[0], &crt); |
1302 | exim_gnutls_peer_err(US"cert 0"); | |
1303 | ||
1304 | state->tlsp->peercert = state->peercert = crt; | |
17c76198 | 1305 | |
17c76198 PP |
1306 | sz = 0; |
1307 | rc = gnutls_x509_crt_get_dn(crt, NULL, &sz); | |
1308 | if (rc != GNUTLS_E_SHORT_MEMORY_BUFFER) | |
83da1223 | 1309 | { |
17c76198 PP |
1310 | exim_gnutls_peer_err(US"getting size for cert DN failed"); |
1311 | return FAIL; /* should not happen */ | |
059ec3d9 | 1312 | } |
17c76198 PP |
1313 | dn_buf = store_get_perm(sz); |
1314 | rc = gnutls_x509_crt_get_dn(crt, CS dn_buf, &sz); | |
1315 | exim_gnutls_peer_err(US"failed to extract certificate DN [gnutls_x509_crt_get_dn(cert 0)]"); | |
9d1c15ef | 1316 | |
17c76198 PP |
1317 | state->peerdn = dn_buf; |
1318 | ||
1319 | return OK; | |
1320 | #undef exim_gnutls_peer_err | |
1321 | } | |
059ec3d9 | 1322 | |
059ec3d9 | 1323 | |
059ec3d9 | 1324 | |
059ec3d9 | 1325 | |
17c76198 PP |
1326 | /************************************************* |
1327 | * Verify peer certificate * | |
1328 | *************************************************/ | |
059ec3d9 | 1329 | |
17c76198 PP |
1330 | /* Called from both server and client code. |
1331 | *Should* be using a callback registered with | |
1332 | gnutls_certificate_set_verify_function() to fail the handshake if we dislike | |
1333 | the peer information, but that's too new for some OSes. | |
059ec3d9 | 1334 | |
17c76198 PP |
1335 | Arguments: |
1336 | state exim_gnutls_state_st * | |
1337 | error where to put an error message | |
059ec3d9 | 1338 | |
17c76198 PP |
1339 | Returns: |
1340 | FALSE if the session should be rejected | |
1341 | TRUE if the cert is okay or we just don't care | |
1342 | */ | |
059ec3d9 | 1343 | |
17c76198 PP |
1344 | static BOOL |
1345 | verify_certificate(exim_gnutls_state_st *state, const char **error) | |
1346 | { | |
1347 | int rc; | |
1348 | unsigned int verify; | |
1349 | ||
1350 | *error = NULL; | |
1351 | ||
0a92f87f | 1352 | if ((rc = peer_status(state)) != OK) |
e6060e2c | 1353 | { |
17c76198 | 1354 | verify = GNUTLS_CERT_INVALID; |
0a92f87f | 1355 | *error = "certificate not supplied"; |
17c76198 PP |
1356 | } |
1357 | else | |
17c76198 | 1358 | rc = gnutls_certificate_verify_peers2(state->session, &verify); |
e6060e2c | 1359 | |
17c76198 PP |
1360 | /* Handle the result of verification. INVALID seems to be set as well |
1361 | as REVOKED, but leave the test for both. */ | |
059ec3d9 | 1362 | |
e51c7be2 JH |
1363 | if (rc < 0 || |
1364 | verify & (GNUTLS_CERT_INVALID|GNUTLS_CERT_REVOKED) | |
1365 | ) | |
17c76198 PP |
1366 | { |
1367 | state->peer_cert_verified = FALSE; | |
0a92f87f JH |
1368 | if (!*error) |
1369 | *error = verify & GNUTLS_CERT_REVOKED | |
1370 | ? "certificate revoked" : "certificate invalid"; | |
059ec3d9 | 1371 | |
17c76198 | 1372 | DEBUG(D_tls) |
e51c7be2 | 1373 | debug_printf("TLS certificate verification failed (%s): peerdn=\"%s\"\n", |
4fe99a6c | 1374 | *error, state->peerdn ? state->peerdn : US"<unset>"); |
059ec3d9 | 1375 | |
e51c7be2 | 1376 | if (state->verify_requirement >= VERIFY_REQUIRED) |
17c76198 | 1377 | { |
e51c7be2 JH |
1378 | gnutls_alert_send(state->session, |
1379 | GNUTLS_AL_FATAL, GNUTLS_A_BAD_CERTIFICATE); | |
17c76198 PP |
1380 | return FALSE; |
1381 | } | |
1382 | DEBUG(D_tls) | |
4789da3a | 1383 | debug_printf("TLS verify failure overridden (host in tls_try_verify_hosts)\n"); |
17c76198 | 1384 | } |
e51c7be2 | 1385 | |
17c76198 PP |
1386 | else |
1387 | { | |
e51c7be2 | 1388 | #ifdef EXPERIMENTAL_CERTNAMES |
aa2a70ba | 1389 | if (state->exp_tls_verify_cert_hostnames) |
e51c7be2 JH |
1390 | { |
1391 | int sep = 0; | |
1392 | uschar * list = state->exp_tls_verify_cert_hostnames; | |
1393 | uschar * name; | |
1394 | while (name = string_nextinlist(&list, &sep, NULL, 0)) | |
1395 | if (gnutls_x509_crt_check_hostname(state->tlsp->peercert, CS name)) | |
1396 | break; | |
1397 | if (!name) | |
1398 | { | |
1399 | DEBUG(D_tls) | |
1400 | debug_printf("TLS certificate verification failed: cert name mismatch\n"); | |
aa2a70ba JH |
1401 | if (state->verify_requirement >= VERIFY_REQUIRED) |
1402 | { | |
1403 | gnutls_alert_send(state->session, | |
1404 | GNUTLS_AL_FATAL, GNUTLS_A_BAD_CERTIFICATE); | |
1405 | return FALSE; | |
1406 | } | |
1407 | return TRUE; | |
e51c7be2 JH |
1408 | } |
1409 | } | |
1410 | #endif | |
17c76198 | 1411 | state->peer_cert_verified = TRUE; |
e51c7be2 | 1412 | DEBUG(D_tls) debug_printf("TLS certificate verified: peerdn=\"%s\"\n", |
4fe99a6c | 1413 | state->peerdn ? state->peerdn : US"<unset>"); |
17c76198 | 1414 | } |
059ec3d9 | 1415 | |
817d9f57 | 1416 | state->tlsp->peerdn = state->peerdn; |
059ec3d9 | 1417 | |
17c76198 PP |
1418 | return TRUE; |
1419 | } | |
059ec3d9 | 1420 | |
17c76198 PP |
1421 | |
1422 | ||
1423 | ||
1424 | /* ------------------------------------------------------------------------ */ | |
1425 | /* Callbacks */ | |
1426 | ||
1427 | /* Logging function which can be registered with | |
1428 | * gnutls_global_set_log_function() | |
1429 | * gnutls_global_set_log_level() 0..9 | |
1430 | */ | |
af3498d6 | 1431 | #if EXIM_GNUTLS_LIBRARY_LOG_LEVEL >= 0 |
059ec3d9 | 1432 | static void |
17c76198 | 1433 | exim_gnutls_logger_cb(int level, const char *message) |
059ec3d9 | 1434 | { |
8c79eebf PP |
1435 | size_t len = strlen(message); |
1436 | if (len < 1) | |
1437 | { | |
1438 | DEBUG(D_tls) debug_printf("GnuTLS<%d> empty debug message\n", level); | |
1439 | return; | |
1440 | } | |
1441 | DEBUG(D_tls) debug_printf("GnuTLS<%d>: %s%s", level, message, | |
1442 | message[len-1] == '\n' ? "" : "\n"); | |
17c76198 | 1443 | } |
af3498d6 | 1444 | #endif |
059ec3d9 | 1445 | |
059ec3d9 | 1446 | |
17c76198 PP |
1447 | /* Called after client hello, should handle SNI work. |
1448 | This will always set tls_sni (state->received_sni) if available, | |
1449 | and may trigger presenting different certificates, | |
1450 | if state->trigger_sni_changes is TRUE. | |
059ec3d9 | 1451 | |
17c76198 PP |
1452 | Should be registered with |
1453 | gnutls_handshake_set_post_client_hello_function() | |
059ec3d9 | 1454 | |
17c76198 PP |
1455 | "This callback must return 0 on success or a gnutls error code to terminate the |
1456 | handshake.". | |
059ec3d9 | 1457 | |
17c76198 PP |
1458 | For inability to get SNI information, we return 0. |
1459 | We only return non-zero if re-setup failed. | |
817d9f57 | 1460 | Only used for server-side TLS. |
17c76198 | 1461 | */ |
44bbabb5 | 1462 | |
17c76198 PP |
1463 | static int |
1464 | exim_sni_handling_cb(gnutls_session_t session) | |
1465 | { | |
1466 | char sni_name[MAX_HOST_LEN]; | |
1467 | size_t data_len = MAX_HOST_LEN; | |
817d9f57 | 1468 | exim_gnutls_state_st *state = &state_server; |
17c76198 PP |
1469 | unsigned int sni_type; |
1470 | int rc, old_pool; | |
1471 | ||
1472 | rc = gnutls_server_name_get(session, sni_name, &data_len, &sni_type, 0); | |
b34fc30c PP |
1473 | if (rc != GNUTLS_E_SUCCESS) |
1474 | { | |
1475 | DEBUG(D_tls) { | |
1476 | if (rc == GNUTLS_E_REQUESTED_DATA_NOT_AVAILABLE) | |
1477 | debug_printf("TLS: no SNI presented in handshake.\n"); | |
1478 | else | |
1479 | debug_printf("TLS failure: gnutls_server_name_get(): %s [%d]\n", | |
1480 | gnutls_strerror(rc), rc); | |
1481 | }; | |
1482 | return 0; | |
1483 | } | |
1484 | ||
17c76198 PP |
1485 | if (sni_type != GNUTLS_NAME_DNS) |
1486 | { | |
1487 | DEBUG(D_tls) debug_printf("TLS: ignoring SNI of unhandled type %u\n", sni_type); | |
1488 | return 0; | |
1489 | } | |
44bbabb5 | 1490 | |
17c76198 PP |
1491 | /* We now have a UTF-8 string in sni_name */ |
1492 | old_pool = store_pool; | |
1493 | store_pool = POOL_PERM; | |
1494 | state->received_sni = string_copyn(US sni_name, data_len); | |
1495 | store_pool = old_pool; | |
1496 | ||
1497 | /* We set this one now so that variable expansions below will work */ | |
817d9f57 | 1498 | state->tlsp->sni = state->received_sni; |
17c76198 PP |
1499 | |
1500 | DEBUG(D_tls) debug_printf("Received TLS SNI \"%s\"%s\n", sni_name, | |
1501 | state->trigger_sni_changes ? "" : " (unused for certificate selection)"); | |
1502 | ||
1503 | if (!state->trigger_sni_changes) | |
1504 | return 0; | |
1505 | ||
1506 | rc = tls_expand_session_files(state); | |
1507 | if (rc != OK) | |
1508 | { | |
1509 | /* If the setup of certs/etc failed before handshake, TLS would not have | |
1510 | been offered. The best we can do now is abort. */ | |
1511 | return GNUTLS_E_APPLICATION_ERROR_MIN; | |
1512 | } | |
1513 | ||
1365611d PP |
1514 | rc = tls_set_remaining_x509(state); |
1515 | if (rc != OK) return GNUTLS_E_APPLICATION_ERROR_MIN; | |
1516 | ||
1517 | return 0; | |
059ec3d9 PH |
1518 | } |
1519 | ||
1520 | ||
1521 | ||
f2de3a33 | 1522 | #ifndef DISABLE_OCSP |
44662487 JH |
1523 | |
1524 | static int | |
1525 | server_ocsp_stapling_cb(gnutls_session_t session, void * ptr, | |
1526 | gnutls_datum_t * ocsp_response) | |
1527 | { | |
1528 | int ret; | |
1529 | ||
44662487 JH |
1530 | if ((ret = gnutls_load_file(ptr, ocsp_response)) < 0) |
1531 | { | |
1532 | DEBUG(D_tls) debug_printf("Failed to load ocsp stapling file %s\n", | |
1533 | (char *)ptr); | |
018058b2 | 1534 | tls_in.ocsp = OCSP_NOT_RESP; |
44662487 JH |
1535 | return GNUTLS_E_NO_CERTIFICATE_STATUS; |
1536 | } | |
1537 | ||
018058b2 | 1538 | tls_in.ocsp = OCSP_VFY_NOT_TRIED; |
44662487 JH |
1539 | return 0; |
1540 | } | |
1541 | ||
1542 | #endif | |
1543 | ||
1544 | ||
774ef2d7 | 1545 | #ifdef EXPERIMENTAL_EVENT |
a7538db1 JH |
1546 | /* |
1547 | We use this callback to get observability and detail-level control | |
723fe533 JH |
1548 | for an exim TLS connection (either direction), raising a tls:cert event |
1549 | for each cert in the chain presented by the peer. Any event | |
a7538db1 JH |
1550 | can deny verification. |
1551 | ||
1552 | Return 0 for the handshake to continue or non-zero to terminate. | |
1553 | */ | |
1554 | ||
1555 | static int | |
723fe533 | 1556 | verify_cb(gnutls_session_t session) |
a7538db1 JH |
1557 | { |
1558 | const gnutls_datum * cert_list; | |
1559 | unsigned int cert_list_size = 0; | |
1560 | gnutls_x509_crt_t crt; | |
1561 | int rc; | |
b30275b8 | 1562 | uschar * yield; |
a7538db1 JH |
1563 | exim_gnutls_state_st * state = gnutls_session_get_ptr(session); |
1564 | ||
1565 | cert_list = gnutls_certificate_get_peers(session, &cert_list_size); | |
1566 | if (cert_list) | |
1567 | while (cert_list_size--) | |
1568 | { | |
1569 | rc = import_cert(&cert_list[cert_list_size], &crt); | |
1570 | if (rc != GNUTLS_E_SUCCESS) | |
1571 | { | |
1572 | DEBUG(D_tls) debug_printf("TLS: peer cert problem: depth %d: %s\n", | |
1573 | cert_list_size, gnutls_strerror(rc)); | |
1574 | break; | |
1575 | } | |
1576 | ||
1577 | state->tlsp->peercert = crt; | |
b30275b8 JH |
1578 | if ((yield = event_raise(state->event_action, |
1579 | US"tls:cert", string_sprintf("%d", cert_list_size)))) | |
a7538db1 JH |
1580 | { |
1581 | log_write(0, LOG_MAIN, | |
b30275b8 JH |
1582 | "SSL verify denied by event-action: depth=%d: %s", |
1583 | cert_list_size, yield); | |
a7538db1 JH |
1584 | return 1; /* reject */ |
1585 | } | |
1586 | state->tlsp->peercert = NULL; | |
1587 | } | |
1588 | ||
1589 | return 0; | |
1590 | } | |
1591 | ||
1592 | #endif | |
44662487 JH |
1593 | |
1594 | ||
17c76198 PP |
1595 | |
1596 | /* ------------------------------------------------------------------------ */ | |
1597 | /* Exported functions */ | |
1598 | ||
1599 | ||
1600 | ||
1601 | ||
059ec3d9 PH |
1602 | /************************************************* |
1603 | * Start a TLS session in a server * | |
1604 | *************************************************/ | |
1605 | ||
1606 | /* This is called when Exim is running as a server, after having received | |
1607 | the STARTTLS command. It must respond to that command, and then negotiate | |
1608 | a TLS session. | |
1609 | ||
1610 | Arguments: | |
83da1223 | 1611 | require_ciphers list of allowed ciphers or NULL |
059ec3d9 PH |
1612 | |
1613 | Returns: OK on success | |
1614 | DEFER for errors before the start of the negotiation | |
1615 | FAIL for errors during the negotation; the server can't | |
1616 | continue running. | |
1617 | */ | |
1618 | ||
1619 | int | |
17c76198 | 1620 | tls_server_start(const uschar *require_ciphers) |
059ec3d9 PH |
1621 | { |
1622 | int rc; | |
7199e1ee | 1623 | const char *error; |
17c76198 | 1624 | exim_gnutls_state_st *state = NULL; |
059ec3d9 PH |
1625 | |
1626 | /* Check for previous activation */ | |
817d9f57 | 1627 | if (tls_in.active >= 0) |
059ec3d9 | 1628 | { |
17c76198 | 1629 | tls_error(US"STARTTLS received after TLS started", "", NULL); |
059ec3d9 PH |
1630 | smtp_printf("554 Already in TLS\r\n"); |
1631 | return FAIL; | |
1632 | } | |
1633 | ||
1634 | /* Initialize the library. If it fails, it will already have logged the error | |
1635 | and sent an SMTP response. */ | |
1636 | ||
17c76198 | 1637 | DEBUG(D_tls) debug_printf("initialising GnuTLS as a server\n"); |
059ec3d9 | 1638 | |
17c76198 PP |
1639 | rc = tls_init(NULL, tls_certificate, tls_privatekey, |
1640 | NULL, tls_verify_certificates, tls_crl, | |
1641 | require_ciphers, &state); | |
059ec3d9 PH |
1642 | if (rc != OK) return rc; |
1643 | ||
059ec3d9 PH |
1644 | /* If this is a host for which certificate verification is mandatory or |
1645 | optional, set up appropriately. */ | |
1646 | ||
059ec3d9 | 1647 | if (verify_check_host(&tls_verify_hosts) == OK) |
17c76198 | 1648 | { |
e51c7be2 JH |
1649 | DEBUG(D_tls) |
1650 | debug_printf("TLS: a client certificate will be required.\n"); | |
17c76198 PP |
1651 | state->verify_requirement = VERIFY_REQUIRED; |
1652 | gnutls_certificate_server_set_request(state->session, GNUTLS_CERT_REQUIRE); | |
1653 | } | |
059ec3d9 | 1654 | else if (verify_check_host(&tls_try_verify_hosts) == OK) |
17c76198 | 1655 | { |
e51c7be2 JH |
1656 | DEBUG(D_tls) |
1657 | debug_printf("TLS: a client certificate will be requested but not required.\n"); | |
17c76198 PP |
1658 | state->verify_requirement = VERIFY_OPTIONAL; |
1659 | gnutls_certificate_server_set_request(state->session, GNUTLS_CERT_REQUEST); | |
1660 | } | |
1661 | else | |
1662 | { | |
e51c7be2 JH |
1663 | DEBUG(D_tls) |
1664 | debug_printf("TLS: a client certificate will not be requested.\n"); | |
17c76198 PP |
1665 | state->verify_requirement = VERIFY_NONE; |
1666 | gnutls_certificate_server_set_request(state->session, GNUTLS_CERT_IGNORE); | |
1667 | } | |
059ec3d9 | 1668 | |
723fe533 JH |
1669 | #ifdef EXPERIMENTAL_EVENT |
1670 | if (event_action) | |
1671 | { | |
1672 | state->event_action = event_action; | |
1673 | gnutls_session_set_ptr(state->session, state); | |
1674 | gnutls_certificate_set_verify_function(state->x509_cred, verify_cb); | |
1675 | } | |
1676 | #endif | |
1677 | ||
17c76198 PP |
1678 | /* Register SNI handling; always, even if not in tls_certificate, so that the |
1679 | expansion variable $tls_sni is always available. */ | |
059ec3d9 | 1680 | |
17c76198 PP |
1681 | gnutls_handshake_set_post_client_hello_function(state->session, |
1682 | exim_sni_handling_cb); | |
059ec3d9 PH |
1683 | |
1684 | /* Set context and tell client to go ahead, except in the case of TLS startup | |
1685 | on connection, where outputting anything now upsets the clients and tends to | |
1686 | make them disconnect. We need to have an explicit fflush() here, to force out | |
1687 | the response. Other smtp_printf() calls do not need it, because in non-TLS | |
1688 | mode, the fflush() happens when smtp_getc() is called. */ | |
1689 | ||
817d9f57 | 1690 | if (!state->tlsp->on_connect) |
059ec3d9 PH |
1691 | { |
1692 | smtp_printf("220 TLS go ahead\r\n"); | |
9d1c15ef | 1693 | fflush(smtp_out); |
059ec3d9 PH |
1694 | } |
1695 | ||
1696 | /* Now negotiate the TLS session. We put our own timer on it, since it seems | |
1697 | that the GnuTLS library doesn't. */ | |
1698 | ||
17c76198 | 1699 | gnutls_transport_set_ptr2(state->session, |
44662487 JH |
1700 | (gnutls_transport_ptr)(long) fileno(smtp_in), |
1701 | (gnutls_transport_ptr)(long) fileno(smtp_out)); | |
17c76198 PP |
1702 | state->fd_in = fileno(smtp_in); |
1703 | state->fd_out = fileno(smtp_out); | |
059ec3d9 PH |
1704 | |
1705 | sigalrm_seen = FALSE; | |
1706 | if (smtp_receive_timeout > 0) alarm(smtp_receive_timeout); | |
17c76198 PP |
1707 | do |
1708 | { | |
1709 | rc = gnutls_handshake(state->session); | |
619b2b25 PP |
1710 | } while ((rc == GNUTLS_E_AGAIN) || |
1711 | (rc == GNUTLS_E_INTERRUPTED && !sigalrm_seen)); | |
059ec3d9 PH |
1712 | alarm(0); |
1713 | ||
17c76198 | 1714 | if (rc != GNUTLS_E_SUCCESS) |
059ec3d9 | 1715 | { |
17c76198 PP |
1716 | tls_error(US"gnutls_handshake", |
1717 | sigalrm_seen ? "timed out" : gnutls_strerror(rc), NULL); | |
059ec3d9 PH |
1718 | /* It seems that, except in the case of a timeout, we have to close the |
1719 | connection right here; otherwise if the other end is running OpenSSL it hangs | |
1720 | until the server times out. */ | |
1721 | ||
1722 | if (!sigalrm_seen) | |
1723 | { | |
f1e894f3 PH |
1724 | (void)fclose(smtp_out); |
1725 | (void)fclose(smtp_in); | |
059ec3d9 PH |
1726 | } |
1727 | ||
1728 | return FAIL; | |
1729 | } | |
1730 | ||
1731 | DEBUG(D_tls) debug_printf("gnutls_handshake was successful\n"); | |
1732 | ||
17c76198 PP |
1733 | /* Verify after the fact */ |
1734 | ||
9d1c15ef JH |
1735 | if ( state->verify_requirement != VERIFY_NONE |
1736 | && !verify_certificate(state, &error)) | |
059ec3d9 | 1737 | { |
9d1c15ef | 1738 | if (state->verify_requirement != VERIFY_OPTIONAL) |
17c76198 | 1739 | { |
9d1c15ef JH |
1740 | tls_error(US"certificate verification failed", error, NULL); |
1741 | return FAIL; | |
17c76198 | 1742 | } |
9d1c15ef JH |
1743 | DEBUG(D_tls) |
1744 | debug_printf("TLS: continuing on only because verification was optional, after: %s\n", | |
1745 | error); | |
059ec3d9 PH |
1746 | } |
1747 | ||
17c76198 PP |
1748 | /* Figure out peer DN, and if authenticated, etc. */ |
1749 | ||
1750 | rc = peer_status(state); | |
1751 | if (rc != OK) return rc; | |
1752 | ||
1753 | /* Sets various Exim expansion variables; always safe within server */ | |
1754 | ||
9d1c15ef | 1755 | extract_exim_vars_from_tls_state(state); |
059ec3d9 PH |
1756 | |
1757 | /* TLS has been set up. Adjust the input functions to read via TLS, | |
1758 | and initialize appropriately. */ | |
1759 | ||
17c76198 | 1760 | state->xfer_buffer = store_malloc(ssl_xfer_buffer_size); |
059ec3d9 PH |
1761 | |
1762 | receive_getc = tls_getc; | |
1763 | receive_ungetc = tls_ungetc; | |
1764 | receive_feof = tls_feof; | |
1765 | receive_ferror = tls_ferror; | |
58eb016e | 1766 | receive_smtp_buffered = tls_smtp_buffered; |
059ec3d9 | 1767 | |
059ec3d9 PH |
1768 | return OK; |
1769 | } | |
1770 | ||
1771 | ||
1772 | ||
1773 | ||
aa2a70ba JH |
1774 | #ifdef EXPERIMENTAL_CERTNAMES |
1775 | static void | |
1776 | tls_client_setup_hostname_checks(host_item * host, exim_gnutls_state_st * state, | |
1777 | smtp_transport_options_block * ob) | |
1778 | { | |
5130845b | 1779 | if (verify_check_given_host(&ob->tls_verify_cert_hostnames, host) == OK) |
aa2a70ba JH |
1780 | { |
1781 | state->exp_tls_verify_cert_hostnames = host->name; | |
1782 | DEBUG(D_tls) | |
1783 | debug_printf("TLS: server cert verification includes hostname: \"%s\".\n", | |
1784 | state->exp_tls_verify_cert_hostnames); | |
1785 | } | |
1786 | } | |
1787 | #endif | |
1788 | ||
1789 | ||
059ec3d9 PH |
1790 | /************************************************* |
1791 | * Start a TLS session in a client * | |
1792 | *************************************************/ | |
1793 | ||
1794 | /* Called from the smtp transport after STARTTLS has been accepted. | |
1795 | ||
1796 | Arguments: | |
1797 | fd the fd of the connection | |
1798 | host connected host (for messages) | |
83da1223 | 1799 | addr the first address (not used) |
a7538db1 | 1800 | tb transport (always smtp) |
059ec3d9 PH |
1801 | |
1802 | Returns: OK/DEFER/FAIL (because using common functions), | |
1803 | but for a client, DEFER and FAIL have the same meaning | |
1804 | */ | |
1805 | ||
1806 | int | |
17c76198 | 1807 | tls_client_start(int fd, host_item *host, |
f5d78688 | 1808 | address_item *addr ARG_UNUSED, |
0e66b3b6 JH |
1809 | transport_instance *tb |
1810 | #ifdef EXPERIMENTAL_DANE | |
1811 | , dne_answer * unused_tlsa_dnsa | |
1812 | #endif | |
1813 | ) | |
059ec3d9 | 1814 | { |
a7538db1 JH |
1815 | smtp_transport_options_block *ob = |
1816 | (smtp_transport_options_block *)tb->options_block; | |
059ec3d9 | 1817 | int rc; |
17c76198 PP |
1818 | const char *error; |
1819 | exim_gnutls_state_st *state = NULL; | |
f2de3a33 | 1820 | #ifndef DISABLE_OCSP |
5130845b JH |
1821 | BOOL require_ocsp = |
1822 | verify_check_given_host(&ob->hosts_require_ocsp, host) == OK; | |
44662487 | 1823 | BOOL request_ocsp = require_ocsp ? TRUE |
5130845b | 1824 | : verify_check_given_host(&ob->hosts_request_ocsp, host) == OK; |
2b4a568d | 1825 | #endif |
059ec3d9 | 1826 | |
17c76198 | 1827 | DEBUG(D_tls) debug_printf("initialising GnuTLS as a client on fd %d\n", fd); |
059ec3d9 | 1828 | |
65867078 JH |
1829 | if ((rc = tls_init(host, ob->tls_certificate, ob->tls_privatekey, |
1830 | ob->tls_sni, ob->tls_verify_certificates, ob->tls_crl, | |
1831 | ob->tls_require_ciphers, &state)) != OK) | |
2b4a568d | 1832 | return rc; |
059ec3d9 | 1833 | |
54c90be1 | 1834 | { |
65867078 JH |
1835 | int dh_min_bits = ob->tls_dh_min_bits; |
1836 | if (dh_min_bits < EXIM_CLIENT_DH_MIN_MIN_BITS) | |
1837 | { | |
1838 | DEBUG(D_tls) | |
1839 | debug_printf("WARNING: tls_dh_min_bits far too low," | |
1840 | " clamping %d up to %d\n", | |
1841 | dh_min_bits, EXIM_CLIENT_DH_MIN_MIN_BITS); | |
1842 | dh_min_bits = EXIM_CLIENT_DH_MIN_MIN_BITS; | |
1843 | } | |
54c90be1 | 1844 | |
65867078 JH |
1845 | DEBUG(D_tls) debug_printf("Setting D-H prime minimum" |
1846 | " acceptable bits to %d\n", | |
1847 | dh_min_bits); | |
1848 | gnutls_dh_set_prime_bits(state->session, dh_min_bits); | |
1849 | } | |
83da1223 | 1850 | |
2b4a568d JH |
1851 | /* Stick to the old behaviour for compatibility if tls_verify_certificates is |
1852 | set but both tls_verify_hosts and tls_try_verify_hosts are unset. Check only | |
1853 | the specified host patterns if one of them is defined */ | |
1854 | ||
aa2a70ba JH |
1855 | if ( ( state->exp_tls_verify_certificates |
1856 | && !ob->tls_verify_hosts | |
1857 | && !ob->tls_try_verify_hosts | |
1858 | ) | |
5130845b | 1859 | || verify_check_given_host(&ob->tls_verify_hosts, host) == OK |
2b4a568d | 1860 | ) |
17c76198 | 1861 | { |
e51c7be2 | 1862 | #ifdef EXPERIMENTAL_CERTNAMES |
aa2a70ba | 1863 | tls_client_setup_hostname_checks(host, state, ob); |
e51c7be2 | 1864 | #endif |
aa2a70ba JH |
1865 | DEBUG(D_tls) |
1866 | debug_printf("TLS: server certificate verification required.\n"); | |
1867 | state->verify_requirement = VERIFY_REQUIRED; | |
52f93eed WB |
1868 | gnutls_certificate_server_set_request(state->session, GNUTLS_CERT_REQUIRE); |
1869 | } | |
5130845b | 1870 | else if (verify_check_given_host(&ob->tls_try_verify_hosts, host) == OK) |
52f93eed | 1871 | { |
aa2a70ba JH |
1872 | #ifdef EXPERIMENTAL_CERTNAMES |
1873 | tls_client_setup_hostname_checks(host, state, ob); | |
1874 | #endif | |
e51c7be2 JH |
1875 | DEBUG(D_tls) |
1876 | debug_printf("TLS: server certificate verification optional.\n"); | |
52f93eed | 1877 | state->verify_requirement = VERIFY_OPTIONAL; |
17c76198 PP |
1878 | gnutls_certificate_server_set_request(state->session, GNUTLS_CERT_REQUEST); |
1879 | } | |
1880 | else | |
1881 | { | |
e51c7be2 JH |
1882 | DEBUG(D_tls) |
1883 | debug_printf("TLS: server certificate verification not required.\n"); | |
52f93eed WB |
1884 | state->verify_requirement = VERIFY_NONE; |
1885 | gnutls_certificate_server_set_request(state->session, GNUTLS_CERT_IGNORE); | |
17c76198 | 1886 | } |
059ec3d9 | 1887 | |
f2de3a33 JH |
1888 | #ifndef DISABLE_OCSP |
1889 | /* supported since GnuTLS 3.1.3 */ | |
44662487 | 1890 | if (request_ocsp) |
9d1c15ef JH |
1891 | { |
1892 | DEBUG(D_tls) debug_printf("TLS: will request OCSP stapling\n"); | |
65867078 JH |
1893 | if ((rc = gnutls_ocsp_status_request_enable_client(state->session, |
1894 | NULL, 0, NULL)) != OK) | |
9d1c15ef JH |
1895 | return tls_error(US"cert-status-req", |
1896 | gnutls_strerror(rc), state->host); | |
44662487 | 1897 | tls_out.ocsp = OCSP_NOT_RESP; |
9d1c15ef | 1898 | } |
2b4a568d JH |
1899 | #endif |
1900 | ||
774ef2d7 JH |
1901 | #ifdef EXPERIMENTAL_EVENT |
1902 | if (tb->event_action) | |
a7538db1 | 1903 | { |
774ef2d7 | 1904 | state->event_action = tb->event_action; |
a7538db1 | 1905 | gnutls_session_set_ptr(state->session, state); |
723fe533 | 1906 | gnutls_certificate_set_verify_function(state->x509_cred, verify_cb); |
a7538db1 JH |
1907 | } |
1908 | #endif | |
1909 | ||
44662487 | 1910 | gnutls_transport_set_ptr(state->session, (gnutls_transport_ptr)(long) fd); |
17c76198 PP |
1911 | state->fd_in = fd; |
1912 | state->fd_out = fd; | |
059ec3d9 | 1913 | |
9d1c15ef | 1914 | DEBUG(D_tls) debug_printf("about to gnutls_handshake\n"); |
059ec3d9 PH |
1915 | /* There doesn't seem to be a built-in timeout on connection. */ |
1916 | ||
1917 | sigalrm_seen = FALSE; | |
65867078 | 1918 | alarm(ob->command_timeout); |
17c76198 PP |
1919 | do |
1920 | { | |
1921 | rc = gnutls_handshake(state->session); | |
619b2b25 PP |
1922 | } while ((rc == GNUTLS_E_AGAIN) || |
1923 | (rc == GNUTLS_E_INTERRUPTED && !sigalrm_seen)); | |
059ec3d9 PH |
1924 | alarm(0); |
1925 | ||
4fe99a6c PP |
1926 | if (rc != GNUTLS_E_SUCCESS) |
1927 | return tls_error(US"gnutls_handshake", | |
1928 | sigalrm_seen ? "timed out" : gnutls_strerror(rc), state->host); | |
1929 | ||
17c76198 | 1930 | DEBUG(D_tls) debug_printf("gnutls_handshake was successful\n"); |
059ec3d9 | 1931 | |
17c76198 | 1932 | /* Verify late */ |
059ec3d9 | 1933 | |
17c76198 PP |
1934 | if (state->verify_requirement != VERIFY_NONE && |
1935 | !verify_certificate(state, &error)) | |
1936 | return tls_error(US"certificate verification failed", error, state->host); | |
059ec3d9 | 1937 | |
f2de3a33 | 1938 | #ifndef DISABLE_OCSP |
2b4a568d JH |
1939 | if (require_ocsp) |
1940 | { | |
1941 | DEBUG(D_tls) | |
1942 | { | |
1943 | gnutls_datum_t stapling; | |
1944 | gnutls_ocsp_resp_t resp; | |
1945 | gnutls_datum_t printed; | |
1946 | if ( (rc= gnutls_ocsp_status_request_get(state->session, &stapling)) == 0 | |
1947 | && (rc= gnutls_ocsp_resp_init(&resp)) == 0 | |
1948 | && (rc= gnutls_ocsp_resp_import(resp, &stapling)) == 0 | |
1949 | && (rc= gnutls_ocsp_resp_print(resp, GNUTLS_OCSP_PRINT_FULL, &printed)) == 0 | |
1950 | ) | |
1951 | { | |
65867078 | 1952 | debug_printf("%.4096s", printed.data); |
2b4a568d JH |
1953 | gnutls_free(printed.data); |
1954 | } | |
1955 | else | |
1956 | (void) tls_error(US"ocsp decode", gnutls_strerror(rc), state->host); | |
1957 | } | |
1958 | ||
2b4a568d | 1959 | if (gnutls_ocsp_status_request_is_checked(state->session, 0) == 0) |
018058b2 JH |
1960 | { |
1961 | tls_out.ocsp = OCSP_FAILED; | |
2b4a568d | 1962 | return tls_error(US"certificate status check failed", NULL, state->host); |
018058b2 | 1963 | } |
2b4a568d | 1964 | DEBUG(D_tls) debug_printf("Passed OCSP checking\n"); |
44662487 | 1965 | tls_out.ocsp = OCSP_VFIED; |
2b4a568d JH |
1966 | } |
1967 | #endif | |
1968 | ||
17c76198 | 1969 | /* Figure out peer DN, and if authenticated, etc. */ |
059ec3d9 | 1970 | |
2b4a568d JH |
1971 | if ((rc = peer_status(state)) != OK) |
1972 | return rc; | |
059ec3d9 | 1973 | |
4fe99a6c | 1974 | /* Sets various Exim expansion variables; may need to adjust for ACL callouts */ |
059ec3d9 | 1975 | |
9d1c15ef | 1976 | extract_exim_vars_from_tls_state(state); |
059ec3d9 | 1977 | |
059ec3d9 PH |
1978 | return OK; |
1979 | } | |
1980 | ||
1981 | ||
1982 | ||
17c76198 | 1983 | |
059ec3d9 | 1984 | /************************************************* |
17c76198 | 1985 | * Close down a TLS session * |
059ec3d9 PH |
1986 | *************************************************/ |
1987 | ||
17c76198 PP |
1988 | /* This is also called from within a delivery subprocess forked from the |
1989 | daemon, to shut down the TLS library, without actually doing a shutdown (which | |
1990 | would tamper with the TLS session in the parent process). | |
059ec3d9 | 1991 | |
17c76198 PP |
1992 | Arguments: TRUE if gnutls_bye is to be called |
1993 | Returns: nothing | |
059ec3d9 PH |
1994 | */ |
1995 | ||
17c76198 | 1996 | void |
817d9f57 | 1997 | tls_close(BOOL is_server, BOOL shutdown) |
059ec3d9 | 1998 | { |
817d9f57 | 1999 | exim_gnutls_state_st *state = is_server ? &state_server : &state_client; |
059ec3d9 | 2000 | |
389ca47a | 2001 | if (!state->tlsp || state->tlsp->active < 0) return; /* TLS was not active */ |
17c76198 PP |
2002 | |
2003 | if (shutdown) | |
2004 | { | |
2005 | DEBUG(D_tls) debug_printf("tls_close(): shutting down TLS\n"); | |
2006 | gnutls_bye(state->session, GNUTLS_SHUT_WR); | |
2007 | } | |
2008 | ||
2009 | gnutls_deinit(state->session); | |
2010 | ||
389ca47a | 2011 | state->tlsp->active = -1; |
17c76198 PP |
2012 | memcpy(state, &exim_gnutls_state_init, sizeof(exim_gnutls_state_init)); |
2013 | ||
2014 | if ((state_server.session == NULL) && (state_client.session == NULL)) | |
2015 | { | |
2016 | gnutls_global_deinit(); | |
2017 | exim_gnutls_base_init_done = FALSE; | |
2018 | } | |
7199e1ee | 2019 | |
059ec3d9 PH |
2020 | } |
2021 | ||
2022 | ||
2023 | ||
17c76198 | 2024 | |
059ec3d9 PH |
2025 | /************************************************* |
2026 | * TLS version of getc * | |
2027 | *************************************************/ | |
2028 | ||
2029 | /* This gets the next byte from the TLS input buffer. If the buffer is empty, | |
2030 | it refills the buffer via the GnuTLS reading function. | |
817d9f57 | 2031 | Only used by the server-side TLS. |
059ec3d9 | 2032 | |
17c76198 PP |
2033 | This feeds DKIM and should be used for all message-body reads. |
2034 | ||
059ec3d9 PH |
2035 | Arguments: none |
2036 | Returns: the next character or EOF | |
2037 | */ | |
2038 | ||
2039 | int | |
2040 | tls_getc(void) | |
2041 | { | |
817d9f57 | 2042 | exim_gnutls_state_st *state = &state_server; |
17c76198 | 2043 | if (state->xfer_buffer_lwm >= state->xfer_buffer_hwm) |
059ec3d9 | 2044 | { |
17c76198 | 2045 | ssize_t inbytes; |
059ec3d9 | 2046 | |
17c76198 PP |
2047 | DEBUG(D_tls) debug_printf("Calling gnutls_record_recv(%p, %p, %u)\n", |
2048 | state->session, state->xfer_buffer, ssl_xfer_buffer_size); | |
059ec3d9 PH |
2049 | |
2050 | if (smtp_receive_timeout > 0) alarm(smtp_receive_timeout); | |
17c76198 | 2051 | inbytes = gnutls_record_recv(state->session, state->xfer_buffer, |
059ec3d9 PH |
2052 | ssl_xfer_buffer_size); |
2053 | alarm(0); | |
2054 | ||
2055 | /* A zero-byte return appears to mean that the TLS session has been | |
2056 | closed down, not that the socket itself has been closed down. Revert to | |
2057 | non-TLS handling. */ | |
2058 | ||
2059 | if (inbytes == 0) | |
2060 | { | |
2061 | DEBUG(D_tls) debug_printf("Got TLS_EOF\n"); | |
2062 | ||
2063 | receive_getc = smtp_getc; | |
2064 | receive_ungetc = smtp_ungetc; | |
2065 | receive_feof = smtp_feof; | |
2066 | receive_ferror = smtp_ferror; | |
58eb016e | 2067 | receive_smtp_buffered = smtp_buffered; |
059ec3d9 | 2068 | |
17c76198 PP |
2069 | gnutls_deinit(state->session); |
2070 | state->session = NULL; | |
817d9f57 JH |
2071 | state->tlsp->active = -1; |
2072 | state->tlsp->bits = 0; | |
2073 | state->tlsp->certificate_verified = FALSE; | |
9d1c15ef | 2074 | tls_channelbinding_b64 = NULL; |
817d9f57 | 2075 | state->tlsp->cipher = NULL; |
9d1c15ef | 2076 | state->tlsp->peercert = NULL; |
817d9f57 | 2077 | state->tlsp->peerdn = NULL; |
059ec3d9 PH |
2078 | |
2079 | return smtp_getc(); | |
2080 | } | |
2081 | ||
2082 | /* Handle genuine errors */ | |
2083 | ||
2084 | else if (inbytes < 0) | |
2085 | { | |
17c76198 PP |
2086 | record_io_error(state, (int) inbytes, US"recv", NULL); |
2087 | state->xfer_error = 1; | |
059ec3d9 PH |
2088 | return EOF; |
2089 | } | |
80a47a2c | 2090 | #ifndef DISABLE_DKIM |
17c76198 | 2091 | dkim_exim_verify_feed(state->xfer_buffer, inbytes); |
80a47a2c | 2092 | #endif |
17c76198 PP |
2093 | state->xfer_buffer_hwm = (int) inbytes; |
2094 | state->xfer_buffer_lwm = 0; | |
059ec3d9 PH |
2095 | } |
2096 | ||
059ec3d9 PH |
2097 | /* Something in the buffer; return next uschar */ |
2098 | ||
17c76198 | 2099 | return state->xfer_buffer[state->xfer_buffer_lwm++]; |
059ec3d9 PH |
2100 | } |
2101 | ||
2102 | ||
2103 | ||
17c76198 | 2104 | |
059ec3d9 PH |
2105 | /************************************************* |
2106 | * Read bytes from TLS channel * | |
2107 | *************************************************/ | |
2108 | ||
17c76198 PP |
2109 | /* This does not feed DKIM, so if the caller uses this for reading message body, |
2110 | then the caller must feed DKIM. | |
817d9f57 | 2111 | |
059ec3d9 PH |
2112 | Arguments: |
2113 | buff buffer of data | |
2114 | len size of buffer | |
2115 | ||
2116 | Returns: the number of bytes read | |
2117 | -1 after a failed read | |
2118 | */ | |
2119 | ||
2120 | int | |
817d9f57 | 2121 | tls_read(BOOL is_server, uschar *buff, size_t len) |
059ec3d9 | 2122 | { |
817d9f57 | 2123 | exim_gnutls_state_st *state = is_server ? &state_server : &state_client; |
17c76198 | 2124 | ssize_t inbytes; |
059ec3d9 | 2125 | |
17c76198 PP |
2126 | if (len > INT_MAX) |
2127 | len = INT_MAX; | |
059ec3d9 | 2128 | |
17c76198 PP |
2129 | if (state->xfer_buffer_lwm < state->xfer_buffer_hwm) |
2130 | DEBUG(D_tls) | |
2131 | debug_printf("*** PROBABLY A BUG *** " \ | |
2132 | "tls_read() called with data in the tls_getc() buffer, %d ignored\n", | |
2133 | state->xfer_buffer_hwm - state->xfer_buffer_lwm); | |
2134 | ||
2135 | DEBUG(D_tls) | |
2136 | debug_printf("Calling gnutls_record_recv(%p, %p, " SIZE_T_FMT ")\n", | |
2137 | state->session, buff, len); | |
2138 | ||
2139 | inbytes = gnutls_record_recv(state->session, buff, len); | |
059ec3d9 PH |
2140 | if (inbytes > 0) return inbytes; |
2141 | if (inbytes == 0) | |
2142 | { | |
2143 | DEBUG(D_tls) debug_printf("Got TLS_EOF\n"); | |
2144 | } | |
17c76198 | 2145 | else record_io_error(state, (int)inbytes, US"recv", NULL); |
059ec3d9 PH |
2146 | |
2147 | return -1; | |
2148 | } | |
2149 | ||
2150 | ||
2151 | ||
17c76198 | 2152 | |
059ec3d9 PH |
2153 | /************************************************* |
2154 | * Write bytes down TLS channel * | |
2155 | *************************************************/ | |
2156 | ||
2157 | /* | |
2158 | Arguments: | |
817d9f57 | 2159 | is_server channel specifier |
059ec3d9 PH |
2160 | buff buffer of data |
2161 | len number of bytes | |
2162 | ||
2163 | Returns: the number of bytes after a successful write, | |
2164 | -1 after a failed write | |
2165 | */ | |
2166 | ||
2167 | int | |
817d9f57 | 2168 | tls_write(BOOL is_server, const uschar *buff, size_t len) |
059ec3d9 | 2169 | { |
17c76198 PP |
2170 | ssize_t outbytes; |
2171 | size_t left = len; | |
817d9f57 | 2172 | exim_gnutls_state_st *state = is_server ? &state_server : &state_client; |
059ec3d9 | 2173 | |
17c76198 | 2174 | DEBUG(D_tls) debug_printf("tls_do_write(%p, " SIZE_T_FMT ")\n", buff, left); |
059ec3d9 PH |
2175 | while (left > 0) |
2176 | { | |
17c76198 PP |
2177 | DEBUG(D_tls) debug_printf("gnutls_record_send(SSL, %p, " SIZE_T_FMT ")\n", |
2178 | buff, left); | |
2179 | outbytes = gnutls_record_send(state->session, buff, left); | |
059ec3d9 | 2180 | |
17c76198 | 2181 | DEBUG(D_tls) debug_printf("outbytes=" SSIZE_T_FMT "\n", outbytes); |
059ec3d9 PH |
2182 | if (outbytes < 0) |
2183 | { | |
17c76198 | 2184 | record_io_error(state, outbytes, US"send", NULL); |
059ec3d9 PH |
2185 | return -1; |
2186 | } | |
2187 | if (outbytes == 0) | |
2188 | { | |
17c76198 | 2189 | record_io_error(state, 0, US"send", US"TLS channel closed on write"); |
059ec3d9 PH |
2190 | return -1; |
2191 | } | |
2192 | ||
2193 | left -= outbytes; | |
2194 | buff += outbytes; | |
2195 | } | |
2196 | ||
17c76198 PP |
2197 | if (len > INT_MAX) |
2198 | { | |
2199 | DEBUG(D_tls) | |
2200 | debug_printf("Whoops! Wrote more bytes (" SIZE_T_FMT ") than INT_MAX\n", | |
2201 | len); | |
2202 | len = INT_MAX; | |
2203 | } | |
2204 | ||
2205 | return (int) len; | |
059ec3d9 PH |
2206 | } |
2207 | ||
2208 | ||
2209 | ||
17c76198 | 2210 | |
059ec3d9 | 2211 | /************************************************* |
17c76198 | 2212 | * Random number generation * |
059ec3d9 PH |
2213 | *************************************************/ |
2214 | ||
17c76198 PP |
2215 | /* Pseudo-random number generation. The result is not expected to be |
2216 | cryptographically strong but not so weak that someone will shoot themselves | |
2217 | in the foot using it as a nonce in input in some email header scheme or | |
2218 | whatever weirdness they'll twist this into. The result should handle fork() | |
2219 | and avoid repeating sequences. OpenSSL handles that for us. | |
059ec3d9 | 2220 | |
17c76198 PP |
2221 | Arguments: |
2222 | max range maximum | |
2223 | Returns a random number in range [0, max-1] | |
059ec3d9 PH |
2224 | */ |
2225 | ||
af3498d6 | 2226 | #ifdef HAVE_GNUTLS_RND |
17c76198 PP |
2227 | int |
2228 | vaguely_random_number(int max) | |
059ec3d9 | 2229 | { |
17c76198 PP |
2230 | unsigned int r; |
2231 | int i, needed_len; | |
2232 | uschar *p; | |
2233 | uschar smallbuf[sizeof(r)]; | |
2234 | ||
2235 | if (max <= 1) | |
2236 | return 0; | |
2237 | ||
2238 | needed_len = sizeof(r); | |
2239 | /* Don't take 8 times more entropy than needed if int is 8 octets and we were | |
2240 | * asked for a number less than 10. */ | |
2241 | for (r = max, i = 0; r; ++i) | |
2242 | r >>= 1; | |
2243 | i = (i + 7) / 8; | |
2244 | if (i < needed_len) | |
2245 | needed_len = i; | |
2246 | ||
2247 | i = gnutls_rnd(GNUTLS_RND_NONCE, smallbuf, needed_len); | |
2248 | if (i < 0) | |
059ec3d9 | 2249 | { |
17c76198 PP |
2250 | DEBUG(D_all) debug_printf("gnutls_rnd() failed, using fallback.\n"); |
2251 | return vaguely_random_number_fallback(max); | |
2252 | } | |
2253 | r = 0; | |
2254 | for (p = smallbuf; needed_len; --needed_len, ++p) | |
2255 | { | |
2256 | r *= 256; | |
2257 | r += *p; | |
059ec3d9 PH |
2258 | } |
2259 | ||
17c76198 PP |
2260 | /* We don't particularly care about weighted results; if someone wants |
2261 | * smooth distribution and cares enough then they should submit a patch then. */ | |
2262 | return r % max; | |
059ec3d9 | 2263 | } |
af3498d6 PP |
2264 | #else /* HAVE_GNUTLS_RND */ |
2265 | int | |
2266 | vaguely_random_number(int max) | |
2267 | { | |
2268 | return vaguely_random_number_fallback(max); | |
2269 | } | |
2270 | #endif /* HAVE_GNUTLS_RND */ | |
059ec3d9 | 2271 | |
36f12725 NM |
2272 | |
2273 | ||
2274 | ||
3375e053 PP |
2275 | /************************************************* |
2276 | * Let tls_require_ciphers be checked at startup * | |
2277 | *************************************************/ | |
2278 | ||
2279 | /* The tls_require_ciphers option, if set, must be something which the | |
2280 | library can parse. | |
2281 | ||
2282 | Returns: NULL on success, or error message | |
2283 | */ | |
2284 | ||
2285 | uschar * | |
2286 | tls_validate_require_cipher(void) | |
2287 | { | |
2288 | int rc; | |
2289 | uschar *expciphers = NULL; | |
2290 | gnutls_priority_t priority_cache; | |
2291 | const char *errpos; | |
2292 | ||
2293 | #define validate_check_rc(Label) do { \ | |
2294 | if (rc != GNUTLS_E_SUCCESS) { if (exim_gnutls_base_init_done) gnutls_global_deinit(); \ | |
2295 | return string_sprintf("%s failed: %s", (Label), gnutls_strerror(rc)); } } while (0) | |
2296 | #define return_deinit(Label) do { gnutls_global_deinit(); return (Label); } while (0) | |
2297 | ||
2298 | if (exim_gnutls_base_init_done) | |
2299 | log_write(0, LOG_MAIN|LOG_PANIC, | |
2300 | "already initialised GnuTLS, Exim developer bug"); | |
2301 | ||
a5f239e4 | 2302 | #ifdef HAVE_GNUTLS_PKCS11 |
2519e60d | 2303 | if (!gnutls_allow_auto_pkcs11) |
a5f239e4 PP |
2304 | { |
2305 | rc = gnutls_pkcs11_init(GNUTLS_PKCS11_FLAG_MANUAL, NULL); | |
2306 | validate_check_rc(US"gnutls_pkcs11_init"); | |
2307 | } | |
2308 | #endif | |
3375e053 PP |
2309 | rc = gnutls_global_init(); |
2310 | validate_check_rc(US"gnutls_global_init()"); | |
2311 | exim_gnutls_base_init_done = TRUE; | |
2312 | ||
2313 | if (!(tls_require_ciphers && *tls_require_ciphers)) | |
2314 | return_deinit(NULL); | |
2315 | ||
2316 | if (!expand_check(tls_require_ciphers, US"tls_require_ciphers", &expciphers)) | |
2317 | return_deinit(US"failed to expand tls_require_ciphers"); | |
2318 | ||
2319 | if (!(expciphers && *expciphers)) | |
2320 | return_deinit(NULL); | |
2321 | ||
2322 | DEBUG(D_tls) | |
2323 | debug_printf("tls_require_ciphers expands to \"%s\"\n", expciphers); | |
2324 | ||
2325 | rc = gnutls_priority_init(&priority_cache, CS expciphers, &errpos); | |
2326 | validate_check_rc(string_sprintf( | |
2327 | "gnutls_priority_init(%s) failed at offset %ld, \"%.8s..\"", | |
2328 | expciphers, errpos - CS expciphers, errpos)); | |
2329 | ||
2330 | #undef return_deinit | |
2331 | #undef validate_check_rc | |
2332 | gnutls_global_deinit(); | |
2333 | ||
2334 | return NULL; | |
2335 | } | |
2336 | ||
2337 | ||
2338 | ||
2339 | ||
36f12725 NM |
2340 | /************************************************* |
2341 | * Report the library versions. * | |
2342 | *************************************************/ | |
2343 | ||
2344 | /* See a description in tls-openssl.c for an explanation of why this exists. | |
2345 | ||
2346 | Arguments: a FILE* to print the results to | |
2347 | Returns: nothing | |
2348 | */ | |
2349 | ||
2350 | void | |
2351 | tls_version_report(FILE *f) | |
2352 | { | |
754a0503 PP |
2353 | fprintf(f, "Library version: GnuTLS: Compile: %s\n" |
2354 | " Runtime: %s\n", | |
2355 | LIBGNUTLS_VERSION, | |
2356 | gnutls_check_version(NULL)); | |
36f12725 NM |
2357 | } |
2358 | ||
2b4a568d JH |
2359 | /* vi: aw ai sw=2 |
2360 | */ | |
059ec3d9 | 2361 | /* End of tls-gnu.c */ |