Commit | Line | Data |
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44bbabb5 PP |
1 | /************************************************* |
2 | * Exim - an Internet mail transport agent * | |
3 | *************************************************/ | |
4 | ||
1e1ddfac | 5 | /* Copyright (c) The Exim Maintainers 2019-2020 */ |
f9ba5e22 | 6 | /* Copyright (c) University of Cambridge 1995 - 2018 */ |
44bbabb5 PP |
7 | /* See the file NOTICE for conditions of use and distribution. */ |
8 | ||
df6303fa PP |
9 | /* Copyright (c) Twitter Inc 2012 |
10 | Author: Phil Pennock <pdp@exim.org> */ | |
11 | /* Copyright (c) Phil Pennock 2012 */ | |
44bbabb5 PP |
12 | |
13 | /* Interface to GNU SASL library for generic authentication. */ | |
14 | ||
15 | /* Trade-offs: | |
16 | ||
17 | GNU SASL does not provide authentication data itself, so we have to expose | |
18 | that decision to configuration. For some mechanisms, we need to act much | |
19 | like plaintext. For others, we only need to be able to provide some | |
20 | evaluated data on demand. There's no abstracted way (ie, without hardcoding | |
21 | knowledge of authenticators here) to know which need what properties; we | |
22 | can't query a session or the library for "we will need these for mechanism X". | |
23 | ||
24 | So: we always require server_condition, even if sometimes it will just be | |
25 | set as "yes". We do provide a number of other hooks, which might not make | |
26 | sense in all contexts. For some, we can do checks at init time. | |
27 | */ | |
28 | ||
29 | #include "../exim.h" | |
14a806d6 | 30 | #define CHANNELBIND_HACK |
44bbabb5 PP |
31 | |
32 | #ifndef AUTH_GSASL | |
33 | /* dummy function to satisfy compilers when we link in an "empty" file. */ | |
e1d15f5e JH |
34 | static void dummy(int x); |
35 | static void dummy2(int x) { dummy(x-1); } | |
d9d29e05 | 36 | static void dummy(int x) { dummy2(x-1); } |
44bbabb5 PP |
37 | #else |
38 | ||
39 | #include <gsasl.h> | |
40 | #include "gsasl_exim.h" | |
41 | ||
14a806d6 | 42 | |
25bd12fd JH |
43 | #if GSASL_VERSION_MINOR >= 9 |
44 | # define EXIM_GSASL_HAVE_SCRAM_SHA_256 | |
49d47806 JH |
45 | |
46 | # if GSASL_VERSION_PATCH >= 1 | |
47 | # define EXIM_GSASL_SCRAM_S_KEY | |
48 | # endif | |
25bd12fd JH |
49 | #endif |
50 | ||
51 | ||
44bbabb5 PP |
52 | /* Authenticator-specific options. */ |
53 | /* I did have server_*_condition options for various mechanisms, but since | |
54 | we only ever handle one mechanism at a time, I didn't see the point in keeping | |
55 | that. In case someone sees a point, I've left the condition_check() API | |
56 | alone. */ | |
13a4b4c1 JH |
57 | #define LOFF(field) OPT_OFF(auth_gsasl_options_block, field) |
58 | ||
44bbabb5 | 59 | optionlist auth_gsasl_options[] = { |
13a4b4c1 JH |
60 | { "client_authz", opt_stringptr, LOFF(client_authz) }, |
61 | { "client_channelbinding", opt_bool, LOFF(client_channelbinding) }, | |
62 | { "client_password", opt_stringptr, LOFF(client_password) }, | |
63 | { "client_spassword", opt_stringptr, LOFF(client_spassword) }, | |
64 | { "client_username", opt_stringptr, LOFF(client_username) }, | |
65 | ||
66 | { "server_channelbinding", opt_bool, LOFF(server_channelbinding) }, | |
67 | { "server_hostname", opt_stringptr, LOFF(server_hostname) }, | |
49d47806 | 68 | #ifdef EXIM_GSASL_SCRAM_S_KEY |
13a4b4c1 | 69 | { "server_key", opt_stringptr, LOFF(server_key) }, |
49d47806 | 70 | #endif |
13a4b4c1 JH |
71 | { "server_mech", opt_stringptr, LOFF(server_mech) }, |
72 | { "server_password", opt_stringptr, LOFF(server_password) }, | |
73 | { "server_realm", opt_stringptr, LOFF(server_realm) }, | |
74 | { "server_scram_iter", opt_stringptr, LOFF(server_scram_iter) }, | |
75 | { "server_scram_salt", opt_stringptr, LOFF(server_scram_salt) }, | |
49d47806 | 76 | #ifdef EXIM_GSASL_SCRAM_S_KEY |
13a4b4c1 | 77 | { "server_skey", opt_stringptr, LOFF(server_s_key) }, |
49d47806 | 78 | #endif |
13a4b4c1 | 79 | { "server_service", opt_stringptr, LOFF(server_service) } |
44bbabb5 | 80 | }; |
44bbabb5 PP |
81 | |
82 | int auth_gsasl_options_count = | |
83 | sizeof(auth_gsasl_options)/sizeof(optionlist); | |
84 | ||
85 | /* Defaults for the authenticator-specific options. */ | |
86 | auth_gsasl_options_block auth_gsasl_option_defaults = { | |
14a806d6 JH |
87 | .server_service = US"smtp", |
88 | .server_hostname = US"$primary_hostname", | |
89 | .server_scram_iter = US"4096", | |
90 | /* all others zero/null */ | |
44bbabb5 PP |
91 | }; |
92 | ||
d185889f JH |
93 | |
94 | #ifdef MACRO_PREDEF | |
49d47806 | 95 | # include "../macro_predef.h" |
d185889f JH |
96 | |
97 | /* Dummy values */ | |
98 | void auth_gsasl_init(auth_instance *ablock) {} | |
99 | int auth_gsasl_server(auth_instance *ablock, uschar *data) {return 0;} | |
1c519e07 | 100 | int auth_gsasl_client(auth_instance *ablock, void * sx, |
251b9eb4 | 101 | int timeout, uschar *buffer, int buffsize) {return 0;} |
f9df71c0 | 102 | void auth_gsasl_version_report(FILE *f) {} |
d185889f | 103 | |
25bd12fd JH |
104 | void |
105 | auth_gsasl_macros(void) | |
106 | { | |
107 | # ifdef EXIM_GSASL_HAVE_SCRAM_SHA_256 | |
108 | builtin_macro_create(US"_HAVE_AUTH_GSASL_SCRAM_SHA_256"); | |
109 | # endif | |
49d47806 JH |
110 | # ifdef EXIM_GSASL_SCRAM_S_KEY |
111 | builtin_macro_create(US"_HAVE_AUTH_GSASL_SCRAM_S_KEY"); | |
112 | # endif | |
25bd12fd JH |
113 | } |
114 | ||
d185889f JH |
115 | #else /*!MACRO_PREDEF*/ |
116 | ||
117 | ||
118 | ||
44bbabb5 PP |
119 | /* "Globals" for managing the gsasl interface. */ |
120 | ||
121 | static Gsasl *gsasl_ctx = NULL; | |
122 | static int | |
123 | main_callback(Gsasl *ctx, Gsasl_session *sctx, Gsasl_property prop); | |
124 | static int | |
125 | server_callback(Gsasl *ctx, Gsasl_session *sctx, Gsasl_property prop, auth_instance *ablock); | |
126 | static int | |
127 | client_callback(Gsasl *ctx, Gsasl_session *sctx, Gsasl_property prop, auth_instance *ablock); | |
128 | ||
129 | static BOOL sasl_error_should_defer = FALSE; | |
130 | static Gsasl_property callback_loop = 0; | |
131 | static BOOL checked_server_condition = FALSE; | |
132 | ||
133 | enum { CURRENTLY_SERVER = 1, CURRENTLY_CLIENT = 2 }; | |
134 | ||
135 | struct callback_exim_state { | |
136 | auth_instance *ablock; | |
137 | int currently; | |
138 | }; | |
139 | ||
140 | ||
141 | /************************************************* | |
142 | * Initialization entry point * | |
143 | *************************************************/ | |
144 | ||
145 | /* Called for each instance, after its options have been read, to | |
146 | enable consistency checks to be done, or anything else that needs | |
147 | to be set up. */ | |
148 | ||
149 | void | |
150 | auth_gsasl_init(auth_instance *ablock) | |
151 | { | |
14a806d6 JH |
152 | static char * once = NULL; |
153 | int rc; | |
d7978c0f JH |
154 | auth_gsasl_options_block *ob = |
155 | (auth_gsasl_options_block *)(ablock->options_block); | |
156 | ||
157 | /* As per existing Cyrus glue, use the authenticator's public name as | |
158 | the default for the mechanism name; we don't handle multiple mechanisms | |
159 | in one authenticator, but the same driver can be used multiple times. */ | |
160 | ||
6a2c32cb | 161 | if (!ob->server_mech) |
d7978c0f JH |
162 | ob->server_mech = string_copy(ablock->public_name); |
163 | ||
164 | /* Can get multiple session contexts from one library context, so just | |
165 | initialise the once. */ | |
6a2c32cb JH |
166 | |
167 | if (!gsasl_ctx) | |
168 | { | |
169 | if ((rc = gsasl_init(&gsasl_ctx)) != GSASL_OK) | |
d7978c0f JH |
170 | log_write(0, LOG_PANIC_DIE|LOG_CONFIG_FOR, "%s authenticator: " |
171 | "couldn't initialise GNU SASL library: %s (%s)", | |
172 | ablock->name, gsasl_strerror_name(rc), gsasl_strerror(rc)); | |
6a2c32cb | 173 | |
d7978c0f | 174 | gsasl_callback_set(gsasl_ctx, main_callback); |
6a2c32cb | 175 | } |
44bbabb5 | 176 | |
d7978c0f | 177 | /* We don't need this except to log it for debugging. */ |
6a2c32cb | 178 | |
14a806d6 JH |
179 | HDEBUG(D_auth) if (!once) |
180 | { | |
181 | if ((rc = gsasl_server_mechlist(gsasl_ctx, &once)) != GSASL_OK) | |
182 | log_write(0, LOG_PANIC_DIE|LOG_CONFIG_FOR, "%s authenticator: " | |
183 | "failed to retrieve list of mechanisms: %s (%s)", | |
184 | ablock->name, gsasl_strerror_name(rc), gsasl_strerror(rc)); | |
6a2c32cb | 185 | |
14a806d6 JH |
186 | debug_printf("GNU SASL supports: %s\n", once); |
187 | } | |
44bbabb5 | 188 | |
14a806d6 | 189 | if (!gsasl_client_support_p(gsasl_ctx, CCS ob->server_mech)) |
d7978c0f JH |
190 | log_write(0, LOG_PANIC_DIE|LOG_CONFIG_FOR, "%s authenticator: " |
191 | "GNU SASL does not support mechanism \"%s\"", | |
192 | ablock->name, ob->server_mech); | |
193 | ||
14a806d6 JH |
194 | ablock->server = TRUE; |
195 | ||
6a2c32cb JH |
196 | if ( !ablock->server_condition |
197 | && ( streqic(ob->server_mech, US"EXTERNAL") | |
198 | || streqic(ob->server_mech, US"ANONYMOUS") | |
199 | || streqic(ob->server_mech, US"PLAIN") | |
200 | || streqic(ob->server_mech, US"LOGIN") | |
201 | ) ) | |
14a806d6 JH |
202 | { |
203 | ablock->server = FALSE; | |
204 | HDEBUG(D_auth) debug_printf("%s authenticator: " | |
205 | "Need server_condition for %s mechanism\n", | |
d7978c0f | 206 | ablock->name, ob->server_mech); |
14a806d6 | 207 | } |
44bbabb5 | 208 | |
d7978c0f JH |
209 | /* This does *not* scale to new SASL mechanisms. Need a better way to ask |
210 | which properties will be needed. */ | |
6a2c32cb JH |
211 | |
212 | if ( !ob->server_realm | |
213 | && streqic(ob->server_mech, US"DIGEST-MD5")) | |
14a806d6 JH |
214 | { |
215 | ablock->server = FALSE; | |
216 | HDEBUG(D_auth) debug_printf("%s authenticator: " | |
217 | "Need server_realm for %s mechanism\n", | |
d7978c0f | 218 | ablock->name, ob->server_mech); |
14a806d6 | 219 | } |
ce52b325 | 220 | |
d7978c0f JH |
221 | /* At present, for mechanisms we don't panic on absence of server_condition; |
222 | need to figure out the most generically correct approach to deciding when | |
223 | it's critical and when it isn't. Eg, for simple validation (PLAIN mechanism, | |
224 | etc) it clearly is critical. | |
d7978c0f | 225 | */ |
6a2c32cb | 226 | |
14a806d6 | 227 | ablock->client = ob->client_username && ob->client_password; |
44bbabb5 PP |
228 | } |
229 | ||
230 | ||
231 | /* GNU SASL uses one top-level callback, registered at library level. | |
232 | We dispatch to client and server functions instead. */ | |
233 | ||
234 | static int | |
235 | main_callback(Gsasl *ctx, Gsasl_session *sctx, Gsasl_property prop) | |
236 | { | |
d7978c0f JH |
237 | int rc = 0; |
238 | struct callback_exim_state *cb_state = | |
239 | (struct callback_exim_state *)gsasl_session_hook_get(sctx); | |
240 | ||
6a2c32cb | 241 | if (!cb_state) |
d7978c0f | 242 | { |
14a806d6 JH |
243 | HDEBUG(D_auth) debug_printf("gsasl callback (%d) not from our server/client processing\n", prop); |
244 | #ifdef CHANNELBIND_HACK | |
245 | if (prop == GSASL_CB_TLS_UNIQUE) | |
246 | { | |
247 | uschar * s; | |
248 | if ((s = gsasl_callback_hook_get(ctx))) | |
249 | { | |
250 | HDEBUG(D_auth) debug_printf("GSASL_CB_TLS_UNIQUE from ctx hook\n"); | |
251 | gsasl_property_set(sctx, GSASL_CB_TLS_UNIQUE, CS s); | |
252 | } | |
253 | else | |
254 | { | |
255 | HDEBUG(D_auth) debug_printf("GSASL_CB_TLS_UNIQUE! dummy for now\n"); | |
256 | gsasl_property_set(sctx, GSASL_CB_TLS_UNIQUE, ""); | |
257 | } | |
258 | return GSASL_OK; | |
259 | } | |
260 | #endif | |
d7978c0f | 261 | return GSASL_NO_CALLBACK; |
44bbabb5 PP |
262 | } |
263 | ||
14a806d6 JH |
264 | HDEBUG(D_auth) |
265 | debug_printf("GNU SASL Callback entered, prop=%d (loop prop=%d)\n", | |
266 | prop, callback_loop); | |
267 | ||
d7978c0f JH |
268 | if (callback_loop > 0) |
269 | { | |
14a806d6 JH |
270 | /* Most likely is that we were asked for property FOO, and to |
271 | expand the string we asked for property BAR to put into an auth | |
272 | variable, but property BAR is not supplied for this mechanism. */ | |
d7978c0f JH |
273 | HDEBUG(D_auth) |
274 | debug_printf("Loop, asked for property %d while handling property %d\n", | |
275 | prop, callback_loop); | |
276 | return GSASL_NO_CALLBACK; | |
44bbabb5 | 277 | } |
d7978c0f | 278 | callback_loop = prop; |
44bbabb5 | 279 | |
d7978c0f JH |
280 | if (cb_state->currently == CURRENTLY_CLIENT) |
281 | rc = client_callback(ctx, sctx, prop, cb_state->ablock); | |
282 | else if (cb_state->currently == CURRENTLY_SERVER) | |
283 | rc = server_callback(ctx, sctx, prop, cb_state->ablock); | |
284 | else | |
285 | log_write(0, LOG_PANIC_DIE|LOG_CONFIG_FOR, "%s authenticator: " | |
286 | "unhandled callback state, bug in Exim", cb_state->ablock->name); | |
287 | /* NOTREACHED */ | |
44bbabb5 | 288 | |
d7978c0f JH |
289 | callback_loop = 0; |
290 | return rc; | |
44bbabb5 PP |
291 | } |
292 | ||
293 | ||
49d47806 JH |
294 | /************************************************* |
295 | * Debug service function * | |
296 | *************************************************/ | |
297 | static const uschar * | |
298 | gsasl_prop_code_to_name(Gsasl_property prop) | |
299 | { | |
300 | switch (prop) | |
301 | { | |
302 | case GSASL_AUTHID: return US"AUTHID"; | |
303 | case GSASL_AUTHZID: return US"AUTHZID"; | |
304 | case GSASL_PASSWORD: return US"PASSWORD"; | |
305 | case GSASL_ANONYMOUS_TOKEN: return US"ANONYMOUS_TOKEN"; | |
306 | case GSASL_SERVICE: return US"SERVICE"; | |
307 | case GSASL_HOSTNAME: return US"HOSTNAME"; | |
308 | case GSASL_GSSAPI_DISPLAY_NAME: return US"GSSAPI_DISPLAY_NAME"; | |
309 | case GSASL_PASSCODE: return US"PASSCODE"; | |
310 | case GSASL_SUGGESTED_PIN: return US"SUGGESTED_PIN"; | |
311 | case GSASL_PIN: return US"PIN"; | |
312 | case GSASL_REALM: return US"REALM"; | |
313 | case GSASL_DIGEST_MD5_HASHED_PASSWORD: return US"DIGEST_MD5_HASHED_PASSWORD"; | |
314 | case GSASL_QOPS: return US"QOPS"; | |
315 | case GSASL_QOP: return US"QOP"; | |
316 | case GSASL_SCRAM_ITER: return US"SCRAM_ITER"; | |
317 | case GSASL_SCRAM_SALT: return US"SCRAM_SALT"; | |
318 | case GSASL_SCRAM_SALTED_PASSWORD: return US"SCRAM_SALTED_PASSWORD"; | |
319 | #ifdef EXIM_GSASL_SCRAM_S_KEY | |
320 | case GSASL_SCRAM_STOREDKEY: return US"SCRAM_STOREDKEY"; | |
321 | case GSASL_SCRAM_SERVERKEY: return US"SCRAM_SERVERKEY"; | |
322 | #endif | |
323 | case GSASL_CB_TLS_UNIQUE: return US"CB_TLS_UNIQUE"; | |
324 | case GSASL_SAML20_IDP_IDENTIFIER: return US"SAML20_IDP_IDENTIFIER"; | |
325 | case GSASL_SAML20_REDIRECT_URL: return US"SAML20_REDIRECT_URL"; | |
326 | case GSASL_OPENID20_REDIRECT_URL: return US"OPENID20_REDIRECT_URL"; | |
327 | case GSASL_OPENID20_OUTCOME_DATA: return US"OPENID20_OUTCOME_DATA"; | |
328 | case GSASL_SAML20_AUTHENTICATE_IN_BROWSER: return US"SAML20_AUTHENTICATE_IN_BROWSER"; | |
329 | case GSASL_OPENID20_AUTHENTICATE_IN_BROWSER: return US"OPENID20_AUTHENTICATE_IN_BROWSER"; | |
330 | #ifdef EXIM_GSASL_SCRAM_S_KEY | |
331 | case GSASL_SCRAM_CLIENTKEY: return US"SCRAM_CLIENTKEY"; | |
332 | #endif | |
333 | case GSASL_VALIDATE_SIMPLE: return US"VALIDATE_SIMPLE"; | |
334 | case GSASL_VALIDATE_EXTERNAL: return US"VALIDATE_EXTERNAL"; | |
335 | case GSASL_VALIDATE_ANONYMOUS: return US"VALIDATE_ANONYMOUS"; | |
336 | case GSASL_VALIDATE_GSSAPI: return US"VALIDATE_GSSAPI"; | |
337 | case GSASL_VALIDATE_SECURID: return US"VALIDATE_SECURID"; | |
338 | case GSASL_VALIDATE_SAML20: return US"VALIDATE_SAML20"; | |
339 | case GSASL_VALIDATE_OPENID20: return US"VALIDATE_OPENID20"; | |
340 | } | |
341 | return CUS string_sprintf("(unknown prop: %d)", (int)prop); | |
342 | } | |
343 | ||
44bbabb5 PP |
344 | /************************************************* |
345 | * Server entry point * | |
346 | *************************************************/ | |
347 | ||
348 | /* For interface, see auths/README */ | |
349 | ||
350 | int | |
351 | auth_gsasl_server(auth_instance *ablock, uschar *initial_data) | |
352 | { | |
d7978c0f JH |
353 | char *tmps; |
354 | char *to_send, *received; | |
355 | Gsasl_session *sctx = NULL; | |
356 | auth_gsasl_options_block *ob = | |
357 | (auth_gsasl_options_block *)(ablock->options_block); | |
358 | struct callback_exim_state cb_state; | |
359 | int rc, auth_result, exim_error, exim_error_override; | |
360 | ||
361 | HDEBUG(D_auth) | |
14a806d6 | 362 | debug_printf("GNU SASL: initialising session for %s, mechanism %s\n", |
d7978c0f JH |
363 | ablock->name, ob->server_mech); |
364 | ||
14a806d6 | 365 | #ifndef DISABLE_TLS |
1c519e07 JH |
366 | if (tls_in.channelbinding && ob->server_channelbinding) |
367 | { | |
368 | # ifdef EXPERIMENTAL_TLS_RESUME | |
369 | if (!tls_in.ext_master_secret && tls_in.resumption == RESUME_USED) | |
370 | { /* per RFC 7677 section 4 */ | |
371 | HDEBUG(D_auth) debug_printf( | |
372 | "channel binding not usable on resumed TLS without extended-master-secret"); | |
373 | return FAIL; | |
374 | } | |
375 | # endif | |
14a806d6 JH |
376 | # ifdef CHANNELBIND_HACK |
377 | /* This is a gross hack to get around the library a) requiring that | |
378 | c-b was already set, at the _start() call, and b) caching a b64'd | |
379 | version of the binding then which it never updates. */ | |
380 | ||
14a806d6 JH |
381 | gsasl_callback_hook_set(gsasl_ctx, tls_in.channelbinding); |
382 | # endif | |
1c519e07 | 383 | } |
14a806d6 JH |
384 | #endif |
385 | ||
6a2c32cb | 386 | if ((rc = gsasl_server_start(gsasl_ctx, CCS ob->server_mech, &sctx)) != GSASL_OK) |
d7978c0f JH |
387 | { |
388 | auth_defer_msg = string_sprintf("GNU SASL: session start failure: %s (%s)", | |
389 | gsasl_strerror_name(rc), gsasl_strerror(rc)); | |
390 | HDEBUG(D_auth) debug_printf("%s\n", auth_defer_msg); | |
391 | return DEFER; | |
44bbabb5 | 392 | } |
d7978c0f JH |
393 | /* Hereafter: gsasl_finish(sctx) please */ |
394 | ||
d7978c0f JH |
395 | cb_state.ablock = ablock; |
396 | cb_state.currently = CURRENTLY_SERVER; | |
14a806d6 | 397 | gsasl_session_hook_set(sctx, &cb_state); |
d7978c0f JH |
398 | |
399 | tmps = CS expand_string(ob->server_service); | |
400 | gsasl_property_set(sctx, GSASL_SERVICE, tmps); | |
401 | tmps = CS expand_string(ob->server_hostname); | |
402 | gsasl_property_set(sctx, GSASL_HOSTNAME, tmps); | |
403 | if (ob->server_realm) | |
404 | { | |
405 | tmps = CS expand_string(ob->server_realm); | |
406 | if (tmps && *tmps) | |
407 | gsasl_property_set(sctx, GSASL_REALM, tmps); | |
44bbabb5 | 408 | } |
d7978c0f JH |
409 | /* We don't support protection layers. */ |
410 | gsasl_property_set(sctx, GSASL_QOPS, "qop-auth"); | |
6a2c32cb | 411 | |
01603eec | 412 | #ifndef DISABLE_TLS |
b1a32a3c | 413 | if (tls_in.channelbinding) |
d7978c0f JH |
414 | { |
415 | /* Some auth mechanisms can ensure that both sides are talking withing the | |
416 | same security context; for TLS, this means that even if a bad certificate | |
417 | has been accepted, they remain MitM-proof because both sides must be within | |
418 | the same negotiated session; if someone is terminating one session and | |
419 | proxying data on within a second, authentication will fail. | |
420 | ||
421 | We might not have this available, depending upon TLS implementation, | |
422 | ciphersuite, phase of moon ... | |
423 | ||
424 | If we do, it results in extra SASL mechanisms being available; here, | |
425 | Exim's one-mechanism-per-authenticator potentially causes problems. | |
426 | It depends upon how GNU SASL will implement the PLUS variants of GS2 | |
427 | and whether it automatically mandates a switch to the bound PLUS | |
428 | if the data is available. Since default-on, despite being more secure, | |
429 | would then result in mechanism name changes on a library update, we | |
430 | have little choice but to default it off and let the admin choose to | |
431 | enable it. *sigh* | |
432 | */ | |
433 | if (ob->server_channelbinding) | |
434 | { | |
435 | HDEBUG(D_auth) debug_printf("Auth %s: Enabling channel-binding\n", | |
436 | ablock->name); | |
1c519e07 | 437 | # ifndef CHANNELBIND_HACK |
14a806d6 JH |
438 | gsasl_property_set(sctx, GSASL_CB_TLS_UNIQUE, CCS tls_in.channelbinding); |
439 | # endif | |
44bbabb5 | 440 | } |
d7978c0f | 441 | else |
44bbabb5 | 442 | HDEBUG(D_auth) |
d7978c0f JH |
443 | debug_printf("Auth %s: Not enabling channel-binding (data available)\n", |
444 | ablock->name); | |
44bbabb5 | 445 | } |
d7978c0f JH |
446 | else |
447 | HDEBUG(D_auth) | |
448 | debug_printf("Auth %s: no channel-binding data available\n", | |
449 | ablock->name); | |
44bbabb5 PP |
450 | #endif |
451 | ||
d7978c0f JH |
452 | checked_server_condition = FALSE; |
453 | ||
454 | received = CS initial_data; | |
455 | to_send = NULL; | |
456 | exim_error = exim_error_override = OK; | |
457 | ||
458 | do { | |
6a2c32cb | 459 | switch (rc = gsasl_step64(sctx, received, &to_send)) |
d7978c0f JH |
460 | { |
461 | case GSASL_OK: | |
462 | if (!to_send) | |
463 | goto STOP_INTERACTION; | |
464 | break; | |
465 | ||
466 | case GSASL_NEEDS_MORE: | |
467 | break; | |
468 | ||
469 | case GSASL_AUTHENTICATION_ERROR: | |
470 | case GSASL_INTEGRITY_ERROR: | |
471 | case GSASL_NO_AUTHID: | |
472 | case GSASL_NO_ANONYMOUS_TOKEN: | |
473 | case GSASL_NO_AUTHZID: | |
474 | case GSASL_NO_PASSWORD: | |
475 | case GSASL_NO_PASSCODE: | |
476 | case GSASL_NO_PIN: | |
477 | case GSASL_BASE64_ERROR: | |
478 | HDEBUG(D_auth) debug_printf("GNU SASL permanent error: %s (%s)\n", | |
479 | gsasl_strerror_name(rc), gsasl_strerror(rc)); | |
480 | log_write(0, LOG_REJECT, "%s authenticator (%s):\n " | |
481 | "GNU SASL permanent failure: %s (%s)", | |
482 | ablock->name, ob->server_mech, | |
483 | gsasl_strerror_name(rc), gsasl_strerror(rc)); | |
484 | if (rc == GSASL_BASE64_ERROR) | |
485 | exim_error_override = BAD64; | |
486 | goto STOP_INTERACTION; | |
487 | ||
488 | default: | |
489 | auth_defer_msg = string_sprintf("GNU SASL temporary error: %s (%s)", | |
490 | gsasl_strerror_name(rc), gsasl_strerror(rc)); | |
491 | HDEBUG(D_auth) debug_printf("%s\n", auth_defer_msg); | |
492 | exim_error_override = DEFER; | |
493 | goto STOP_INTERACTION; | |
44bbabb5 PP |
494 | } |
495 | ||
49d47806 | 496 | /*XXX having our caller send the final smtp "235" is unfortunate; wastes a roundtrip */ |
6a2c32cb | 497 | if ((rc == GSASL_NEEDS_MORE) || (to_send && *to_send)) |
14a806d6 | 498 | exim_error = auth_get_no64_data(USS &received, US to_send); |
ce52b325 | 499 | |
d7978c0f JH |
500 | if (to_send) |
501 | { | |
502 | free(to_send); | |
503 | to_send = NULL; | |
ce52b325 PP |
504 | } |
505 | ||
d7978c0f JH |
506 | if (exim_error) |
507 | break; /* handles * cancelled check */ | |
44bbabb5 PP |
508 | |
509 | } while (rc == GSASL_NEEDS_MORE); | |
510 | ||
511 | STOP_INTERACTION: | |
d7978c0f | 512 | auth_result = rc; |
44bbabb5 | 513 | |
49d47806 JH |
514 | HDEBUG(D_auth) |
515 | { | |
516 | const uschar * s; | |
517 | if ((s = CUS gsasl_property_fast(sctx, GSASL_SCRAM_ITER))) | |
518 | debug_printf(" - itercnt: '%s'\n", s); | |
519 | if ((s = CUS gsasl_property_fast(sctx, GSASL_SCRAM_SALT))) | |
520 | debug_printf(" - salt: '%s'\n", s); | |
521 | #ifdef EXIM_GSASL_SCRAM_S_KEY | |
522 | if ((s = CUS gsasl_property_fast(sctx, GSASL_SCRAM_SERVERKEY))) | |
523 | debug_printf(" - ServerKey: '%s'\n", s); | |
524 | if ((s = CUS gsasl_property_fast(sctx, GSASL_SCRAM_STOREDKEY))) | |
525 | debug_printf(" - StoredKey: '%s'\n", s); | |
526 | #endif | |
527 | } | |
528 | ||
d7978c0f | 529 | gsasl_finish(sctx); |
44bbabb5 | 530 | |
d7978c0f | 531 | /* Can return: OK DEFER FAIL CANCELLED BAD64 UNEXPECTED */ |
44bbabb5 | 532 | |
d7978c0f JH |
533 | if (exim_error != OK) |
534 | return exim_error; | |
44bbabb5 | 535 | |
d7978c0f JH |
536 | if (auth_result != GSASL_OK) |
537 | { | |
538 | HDEBUG(D_auth) debug_printf("authentication returned %s (%s)\n", | |
539 | gsasl_strerror_name(auth_result), gsasl_strerror(auth_result)); | |
540 | if (exim_error_override != OK) | |
541 | return exim_error_override; /* might be DEFER */ | |
542 | if (sasl_error_should_defer) /* overriding auth failure SASL error */ | |
543 | return DEFER; | |
544 | return FAIL; | |
44bbabb5 PP |
545 | } |
546 | ||
d7978c0f JH |
547 | /* Auth succeeded, check server_condition unless already done in callback */ |
548 | return checked_server_condition ? OK : auth_check_serv_cond(ablock); | |
44bbabb5 PP |
549 | } |
550 | ||
d7978c0f | 551 | |
44bbabb5 PP |
552 | /* returns the GSASL status of expanding the Exim string given */ |
553 | static int | |
554 | condition_check(auth_instance *ablock, uschar *label, uschar *condition_string) | |
555 | { | |
6a2c32cb JH |
556 | int exim_rc = auth_check_some_cond(ablock, label, condition_string, FAIL); |
557 | switch (exim_rc) | |
d7978c0f | 558 | { |
6a2c32cb JH |
559 | case OK: return GSASL_OK; |
560 | case DEFER: sasl_error_should_defer = TRUE; | |
561 | return GSASL_AUTHENTICATION_ERROR; | |
562 | case FAIL: return GSASL_AUTHENTICATION_ERROR; | |
563 | default: log_write(0, LOG_PANIC_DIE|LOG_CONFIG_FOR, "%s authenticator: " | |
564 | "Unhandled return from checking %s: %d", | |
565 | ablock->name, label, exim_rc); | |
44bbabb5 | 566 | } |
d7978c0f | 567 | |
d7978c0f JH |
568 | /* NOTREACHED */ |
569 | return GSASL_AUTHENTICATION_ERROR; | |
44bbabb5 PP |
570 | } |
571 | ||
2b615f22 JH |
572 | |
573 | static void | |
574 | set_exim_authvar_from_prop(Gsasl_session * sctx, Gsasl_property prop) | |
575 | { | |
576 | uschar * propval = US gsasl_property_fast(sctx, prop); | |
577 | int i = expand_nmax, j = i + 1; | |
578 | propval = propval ? string_copy(propval) : US""; | |
579 | auth_vars[i] = expand_nstring[j] = propval; | |
580 | expand_nlength[j] = Ustrlen(propval); | |
581 | expand_nmax = j; | |
582 | } | |
583 | ||
584 | static void | |
585 | set_exim_authvars_from_a_az_r_props(Gsasl_session * sctx) | |
586 | { | |
587 | if (expand_nmax > 0 ) return; | |
588 | ||
589 | /* Asking for GSASL_AUTHZID calls back into us if we use | |
590 | gsasl_property_get(), thus the use of gsasl_property_fast(). | |
591 | Do we really want to hardcode limits per mechanism? What happens when | |
592 | a new mechanism is added to the library. It *shouldn't* result in us | |
593 | needing to add more glue, since avoiding that is a large part of the | |
594 | point of SASL. */ | |
595 | ||
596 | set_exim_authvar_from_prop(sctx, GSASL_AUTHID); | |
597 | set_exim_authvar_from_prop(sctx, GSASL_AUTHZID); | |
598 | set_exim_authvar_from_prop(sctx, GSASL_REALM); | |
599 | } | |
600 | ||
601 | ||
49d47806 JH |
602 | static int |
603 | prop_from_option(Gsasl_session * sctx, Gsasl_property prop, | |
604 | const uschar * option) | |
605 | { | |
606 | HDEBUG(D_auth) debug_printf(" %s\n", gsasl_prop_code_to_name(prop)); | |
607 | if (option) | |
608 | { | |
609 | set_exim_authvars_from_a_az_r_props(sctx); | |
610 | option = expand_cstring(option); | |
611 | HDEBUG(D_auth) debug_printf(" '%s'\n", option); | |
612 | if (*option) | |
613 | gsasl_property_set(sctx, prop, CCS option); | |
614 | return GSASL_OK; | |
615 | } | |
616 | HDEBUG(D_auth) debug_printf(" option not set\n"); | |
617 | return GSASL_NO_CALLBACK; | |
618 | } | |
619 | ||
44bbabb5 | 620 | static int |
6a2c32cb JH |
621 | server_callback(Gsasl *ctx, Gsasl_session *sctx, Gsasl_property prop, |
622 | auth_instance *ablock) | |
44bbabb5 | 623 | { |
d7978c0f | 624 | char *tmps; |
49d47806 | 625 | uschar *s, *propval; |
d7978c0f JH |
626 | int cbrc = GSASL_NO_CALLBACK; |
627 | auth_gsasl_options_block *ob = | |
628 | (auth_gsasl_options_block *)(ablock->options_block); | |
629 | ||
49d47806 JH |
630 | HDEBUG(D_auth) debug_printf("GNU SASL callback %s for %s/%s as server\n", |
631 | gsasl_prop_code_to_name(prop), ablock->name, ablock->public_name); | |
d7978c0f JH |
632 | |
633 | for (int i = 0; i < AUTH_VARS; i++) auth_vars[i] = NULL; | |
634 | expand_nmax = 0; | |
635 | ||
636 | switch (prop) | |
637 | { | |
638 | case GSASL_VALIDATE_SIMPLE: | |
639 | /* GSASL_AUTHID, GSASL_AUTHZID, and GSASL_PASSWORD */ | |
2b615f22 JH |
640 | set_exim_authvar_from_prop(sctx, GSASL_AUTHID); |
641 | set_exim_authvar_from_prop(sctx, GSASL_AUTHZID); | |
642 | set_exim_authvar_from_prop(sctx, GSASL_PASSWORD); | |
d7978c0f JH |
643 | |
644 | cbrc = condition_check(ablock, US"server_condition", ablock->server_condition); | |
645 | checked_server_condition = TRUE; | |
646 | break; | |
647 | ||
648 | case GSASL_VALIDATE_EXTERNAL: | |
6a2c32cb | 649 | if (!ablock->server_condition) |
d7978c0f | 650 | { |
14a806d6 | 651 | HDEBUG(D_auth) debug_printf("No server_condition supplied, to validate EXTERNAL\n"); |
d7978c0f | 652 | cbrc = GSASL_AUTHENTICATION_ERROR; |
44bbabb5 | 653 | break; |
44bbabb5 | 654 | } |
2b615f22 | 655 | set_exim_authvar_from_prop(sctx, GSASL_AUTHZID); |
d7978c0f JH |
656 | |
657 | cbrc = condition_check(ablock, | |
658 | US"server_condition (EXTERNAL)", ablock->server_condition); | |
659 | checked_server_condition = TRUE; | |
660 | break; | |
661 | ||
662 | case GSASL_VALIDATE_ANONYMOUS: | |
6a2c32cb | 663 | if (!ablock->server_condition) |
d7978c0f | 664 | { |
14a806d6 | 665 | HDEBUG(D_auth) debug_printf("No server_condition supplied, to validate ANONYMOUS\n"); |
d7978c0f | 666 | cbrc = GSASL_AUTHENTICATION_ERROR; |
44bbabb5 | 667 | break; |
44bbabb5 | 668 | } |
2b615f22 | 669 | set_exim_authvar_from_prop(sctx, GSASL_ANONYMOUS_TOKEN); |
d7978c0f JH |
670 | |
671 | cbrc = condition_check(ablock, | |
672 | US"server_condition (ANONYMOUS)", ablock->server_condition); | |
673 | checked_server_condition = TRUE; | |
674 | break; | |
675 | ||
676 | case GSASL_VALIDATE_GSSAPI: | |
677 | /* GSASL_AUTHZID and GSASL_GSSAPI_DISPLAY_NAME | |
678 | The display-name is authenticated as part of GSS, the authzid is claimed | |
679 | by the SASL integration after authentication; protected against tampering | |
680 | (if the SASL mechanism supports that, which Kerberos does) but is | |
681 | unverified, same as normal for other mechanisms. | |
6a2c32cb | 682 | First coding, we had these values swapped, but for consistency and prior |
d7978c0f JH |
683 | to the first release of Exim with this authenticator, they've been |
684 | switched to match the ordering of GSASL_VALIDATE_SIMPLE. */ | |
6a2c32cb | 685 | |
2b615f22 JH |
686 | set_exim_authvar_from_prop(sctx, GSASL_GSSAPI_DISPLAY_NAME); |
687 | set_exim_authvar_from_prop(sctx, GSASL_AUTHZID); | |
d7978c0f JH |
688 | |
689 | /* In this one case, it perhaps makes sense to default back open? | |
690 | But for consistency, let's just mandate server_condition here too. */ | |
6a2c32cb | 691 | |
d7978c0f JH |
692 | cbrc = condition_check(ablock, |
693 | US"server_condition (GSSAPI family)", ablock->server_condition); | |
694 | checked_server_condition = TRUE; | |
695 | break; | |
696 | ||
98eb9592 | 697 | case GSASL_SCRAM_ITER: |
49d47806 | 698 | cbrc = prop_from_option(sctx, prop, ob->server_scram_iter); |
98eb9592 JH |
699 | break; |
700 | ||
701 | case GSASL_SCRAM_SALT: | |
49d47806 | 702 | cbrc = prop_from_option(sctx, prop, ob->server_scram_salt); |
98eb9592 JH |
703 | break; |
704 | ||
49d47806 JH |
705 | #ifdef EXIM_GSASL_SCRAM_S_KEY |
706 | case GSASL_SCRAM_STOREDKEY: | |
707 | cbrc = prop_from_option(sctx, prop, ob->server_s_key); | |
708 | break; | |
709 | ||
710 | case GSASL_SCRAM_SERVERKEY: | |
711 | cbrc = prop_from_option(sctx, prop, ob->server_key); | |
712 | break; | |
713 | #endif | |
714 | ||
d7978c0f | 715 | case GSASL_PASSWORD: |
49d47806 | 716 | /* SCRAM-*: GSASL_AUTHID, GSASL_AUTHZID and GSASL_REALM |
2b615f22 | 717 | DIGEST-MD5: GSASL_AUTHID, GSASL_AUTHZID and GSASL_REALM |
d7978c0f JH |
718 | CRAM-MD5: GSASL_AUTHID |
719 | PLAIN: GSASL_AUTHID and GSASL_AUTHZID | |
720 | LOGIN: GSASL_AUTHID | |
721 | */ | |
2b615f22 | 722 | set_exim_authvars_from_a_az_r_props(sctx); |
d7978c0f | 723 | |
49d47806 | 724 | if (!(s = ob->server_password)) |
2b615f22 JH |
725 | { |
726 | HDEBUG(D_auth) debug_printf("option not set\n"); | |
0299eb6a | 727 | break; |
2b615f22 | 728 | } |
49d47806 | 729 | if (!(tmps = CS expand_string(s))) |
d7978c0f | 730 | { |
2b615f22 | 731 | sasl_error_should_defer = !f.expand_string_forcedfail; |
d7978c0f JH |
732 | HDEBUG(D_auth) debug_printf("server_password expansion failed, so " |
733 | "can't tell GNU SASL library the password for %s\n", auth_vars[0]); | |
734 | return GSASL_AUTHENTICATION_ERROR; | |
44bbabb5 | 735 | } |
2b615f22 | 736 | HDEBUG(D_auth) debug_printf(" set\n"); |
d7978c0f | 737 | gsasl_property_set(sctx, GSASL_PASSWORD, tmps); |
6a2c32cb | 738 | |
d7978c0f JH |
739 | /* This is inadequate; don't think Exim's store stacks are geared |
740 | for memory wiping, so expanding strings will leave stuff laying around. | |
741 | But no need to compound the problem, so get rid of the one we can. */ | |
6a2c32cb | 742 | |
d7978c0f JH |
743 | memset(tmps, '\0', strlen(tmps)); |
744 | cbrc = GSASL_OK; | |
745 | break; | |
746 | ||
747 | default: | |
14a806d6 | 748 | HDEBUG(D_auth) debug_printf(" Unrecognised callback: %d\n", prop); |
d7978c0f | 749 | cbrc = GSASL_NO_CALLBACK; |
44bbabb5 PP |
750 | } |
751 | ||
d7978c0f JH |
752 | HDEBUG(D_auth) debug_printf("Returning %s (%s)\n", |
753 | gsasl_strerror_name(cbrc), gsasl_strerror(cbrc)); | |
44bbabb5 | 754 | |
d7978c0f | 755 | return cbrc; |
44bbabb5 PP |
756 | } |
757 | ||
758 | ||
14a806d6 JH |
759 | /******************************************************************************/ |
760 | ||
761 | #define PROP_OPTIONAL BIT(0) | |
14a806d6 JH |
762 | |
763 | static BOOL | |
49d47806 JH |
764 | set_client_prop(Gsasl_session * sctx, Gsasl_property prop, uschar * val, |
765 | unsigned flags, uschar * buffer, int buffsize) | |
14a806d6 | 766 | { |
0299eb6a | 767 | uschar * s; |
14a806d6 JH |
768 | int rc; |
769 | ||
49d47806 | 770 | if (!val) return !!(flags & PROP_OPTIONAL); |
14a806d6 JH |
771 | if (!(s = expand_string(val)) || !(flags & PROP_OPTIONAL) && !*s) |
772 | { | |
773 | string_format(buffer, buffsize, "%s", expand_string_message); | |
774 | return FALSE; | |
775 | } | |
49d47806 JH |
776 | if (*s) |
777 | { | |
778 | HDEBUG(D_auth) debug_printf("%s: set %s = '%s'\n", __FUNCTION__, | |
779 | gsasl_prop_code_to_name(prop), s); | |
780 | gsasl_property_set(sctx, prop, CS s); | |
781 | } | |
782 | ||
14a806d6 JH |
783 | return TRUE; |
784 | } | |
785 | ||
44bbabb5 PP |
786 | /************************************************* |
787 | * Client entry point * | |
788 | *************************************************/ | |
789 | ||
790 | /* For interface, see auths/README */ | |
791 | ||
792 | int | |
793 | auth_gsasl_client( | |
d0858b27 | 794 | auth_instance *ablock, /* authenticator block */ |
1c519e07 | 795 | void * sx, /* connection */ |
d0858b27 JH |
796 | int timeout, /* command timeout */ |
797 | uschar *buffer, /* buffer for reading response */ | |
798 | int buffsize) /* size of buffer */ | |
44bbabb5 | 799 | { |
14a806d6 JH |
800 | auth_gsasl_options_block *ob = |
801 | (auth_gsasl_options_block *)(ablock->options_block); | |
802 | Gsasl_session * sctx = NULL; | |
803 | struct callback_exim_state cb_state; | |
804 | uschar * s; | |
0299eb6a JH |
805 | BOOL initial = TRUE; |
806 | int rc, yield = FAIL; | |
14a806d6 | 807 | |
d7978c0f | 808 | HDEBUG(D_auth) |
14a806d6 JH |
809 | debug_printf("GNU SASL: initialising session for %s, mechanism %s\n", |
810 | ablock->name, ob->server_mech); | |
811 | ||
812 | *buffer = 0; | |
813 | ||
814 | #ifndef DISABLE_TLS | |
1c519e07 JH |
815 | if (tls_out.channelbinding && ob->client_channelbinding) |
816 | { | |
817 | # ifdef EXPERIMENTAL_TLS_RESUME | |
818 | if (!tls_out.ext_master_secret && tls_out.resumption == RESUME_USED) | |
819 | { /* per RFC 7677 section 4 */ | |
820 | string_format(buffer, buffsize, "%s", | |
821 | "channel binding not usable on resumed TLS without extended-master-secret"); | |
822 | return FAIL; | |
823 | } | |
824 | # endif | |
825 | # ifdef CHANNELBIND_HACK | |
826 | /* This is a gross hack to get around the library a) requiring that | |
827 | c-b was already set, at the _start() call, and b) caching a b64'd | |
828 | version of the binding then which it never updates. */ | |
14a806d6 | 829 | |
1c519e07 JH |
830 | gsasl_callback_hook_set(gsasl_ctx, tls_out.channelbinding); |
831 | # endif | |
832 | } | |
14a806d6 JH |
833 | #endif |
834 | ||
835 | if ((rc = gsasl_client_start(gsasl_ctx, CCS ob->server_mech, &sctx)) != GSASL_OK) | |
836 | { | |
837 | string_format(buffer, buffsize, "GNU SASL: session start failure: %s (%s)", | |
838 | gsasl_strerror_name(rc), gsasl_strerror(rc)); | |
839 | HDEBUG(D_auth) debug_printf("%s\n", buffer); | |
840 | return ERROR; | |
841 | } | |
842 | ||
843 | cb_state.ablock = ablock; | |
844 | cb_state.currently = CURRENTLY_CLIENT; | |
845 | gsasl_session_hook_set(sctx, &cb_state); | |
846 | ||
847 | /* Set properties */ | |
848 | ||
49d47806 | 849 | if ( !set_client_prop(sctx, GSASL_SCRAM_SALTED_PASSWORD, ob->client_spassword, |
0299eb6a | 850 | 0, buffer, buffsize) |
49d47806 JH |
851 | && |
852 | !set_client_prop(sctx, GSASL_PASSWORD, ob->client_password, | |
0299eb6a | 853 | 0, buffer, buffsize) |
49d47806 JH |
854 | || !set_client_prop(sctx, GSASL_AUTHID, ob->client_username, |
855 | 0, buffer, buffsize) | |
856 | || !set_client_prop(sctx, GSASL_AUTHZID, ob->client_authz, | |
0299eb6a | 857 | PROP_OPTIONAL, buffer, buffsize) |
14a806d6 JH |
858 | ) |
859 | return ERROR; | |
860 | ||
861 | #ifndef DISABLE_TLS | |
862 | if (tls_out.channelbinding) | |
863 | if (ob->client_channelbinding) | |
864 | { | |
865 | HDEBUG(D_auth) debug_printf("Auth %s: Enabling channel-binding\n", | |
866 | ablock->name); | |
1c519e07 | 867 | # ifndef CHANNELBIND_HACK |
14a806d6 JH |
868 | gsasl_property_set(sctx, GSASL_CB_TLS_UNIQUE, CCS tls_out.channelbinding); |
869 | # endif | |
870 | } | |
871 | else | |
872 | HDEBUG(D_auth) | |
873 | debug_printf("Auth %s: Not enabling channel-binding (data available)\n", | |
874 | ablock->name); | |
875 | #endif | |
876 | ||
877 | /* Run the SASL conversation with the server */ | |
878 | ||
879 | for(s = NULL; ;) | |
880 | { | |
881 | uschar * outstr; | |
882 | BOOL fail; | |
883 | ||
884 | rc = gsasl_step64(sctx, CS s, CSS &outstr); | |
885 | ||
886 | fail = initial | |
887 | ? smtp_write_command(sx, SCMD_FLUSH, | |
888 | outstr ? "AUTH %s %s\r\n" : "AUTH %s\r\n", | |
889 | ablock->public_name, outstr) <= 0 | |
890 | : outstr | |
891 | ? smtp_write_command(sx, SCMD_FLUSH, "%s\r\n", outstr) <= 0 | |
892 | : FALSE; | |
893 | if (outstr && *outstr) free(outstr); | |
894 | if (fail) | |
895 | { | |
896 | yield = FAIL_SEND; | |
897 | goto done; | |
898 | } | |
899 | initial = FALSE; | |
900 | ||
901 | if (rc != GSASL_NEEDS_MORE) | |
902 | { | |
903 | if (rc != GSASL_OK) | |
904 | { | |
905 | string_format(buffer, buffsize, "gsasl: %s", gsasl_strerror(rc)); | |
906 | break; | |
907 | } | |
908 | ||
909 | /* expecting a final 2xx from the server, accepting the AUTH */ | |
910 | ||
911 | if (smtp_read_response(sx, buffer, buffsize, '2', timeout)) | |
912 | yield = OK; | |
913 | break; /* from SASL sequence loop */ | |
914 | } | |
915 | ||
916 | /* 2xx or 3xx response is acceptable. If 2xx, no further input */ | |
917 | ||
918 | if (!smtp_read_response(sx, buffer, buffsize, '3', timeout)) | |
919 | if (errno == 0 && buffer[0] == '2') | |
920 | buffer[4] = '\0'; | |
921 | else | |
922 | { | |
923 | yield = FAIL; | |
924 | goto done; | |
925 | } | |
926 | s = buffer + 4; | |
927 | } | |
928 | ||
929 | done: | |
49d47806 JH |
930 | HDEBUG(D_auth) |
931 | { | |
932 | const uschar * s = CUS gsasl_property_fast(sctx, GSASL_SCRAM_SALTED_PASSWORD); | |
933 | if (s) debug_printf(" - SaltedPassword: '%s'\n", s); | |
934 | } | |
935 | ||
14a806d6 JH |
936 | gsasl_finish(sctx); |
937 | return yield; | |
44bbabb5 PP |
938 | } |
939 | ||
940 | static int | |
941 | client_callback(Gsasl *ctx, Gsasl_session *sctx, Gsasl_property prop, auth_instance *ablock) | |
942 | { | |
49d47806 JH |
943 | HDEBUG(D_auth) debug_printf("GNU SASL callback %s for %s/%s as client\n", |
944 | gsasl_prop_code_to_name(prop), ablock->name, ablock->public_name); | |
14a806d6 JH |
945 | switch (prop) |
946 | { | |
14a806d6 JH |
947 | case GSASL_CB_TLS_UNIQUE: |
948 | HDEBUG(D_auth) | |
49d47806 | 949 | debug_printf(" filling in\n"); |
14a806d6 JH |
950 | gsasl_property_set(sctx, GSASL_CB_TLS_UNIQUE, CCS tls_out.channelbinding); |
951 | break; | |
49d47806 JH |
952 | default: |
953 | HDEBUG(D_auth) | |
954 | debug_printf(" not providing one\n"); | |
955 | break; | |
14a806d6 JH |
956 | } |
957 | return GSASL_NO_CALLBACK; | |
44bbabb5 PP |
958 | } |
959 | ||
960 | /************************************************* | |
961 | * Diagnostic API * | |
962 | *************************************************/ | |
963 | ||
964 | void | |
965 | auth_gsasl_version_report(FILE *f) | |
966 | { | |
d7978c0f JH |
967 | const char *runtime; |
968 | runtime = gsasl_check_version(NULL); | |
969 | fprintf(f, "Library version: GNU SASL: Compile: %s\n" | |
970 | " Runtime: %s\n", | |
971 | GSASL_VERSION, runtime); | |
44bbabb5 PP |
972 | } |
973 | ||
25bd12fd JH |
974 | |
975 | ||
976 | /* Dummy */ | |
977 | void auth_gsasl_macros(void) {} | |
978 | ||
d185889f | 979 | #endif /*!MACRO_PREDEF*/ |
44bbabb5 PP |
980 | #endif /* AUTH_GSASL */ |
981 | ||
982 | /* End of gsasl_exim.c */ |