Commit | Line | Data |
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dde3daac PP |
1 | /************************************************* |
2 | * Exim - an Internet mail transport agent * | |
3 | *************************************************/ | |
4 | ||
5 | /* Copyright (c) University of Cambridge 1995 - 2012 */ | |
6 | /* See the file NOTICE for conditions of use and distribution. */ | |
7 | ||
8 | /* Copyright (c) Twitter Inc 2012 | |
9 | Author: Phil Pennock <pdp@exim.org> */ | |
f35771fe | 10 | /* Copyright (c) Phil Pennock 2012 */ |
dde3daac | 11 | |
b245b4a5 | 12 | /* Interface to Heimdal library for GSSAPI authentication. */ |
dde3daac PP |
13 | |
14 | /* Naming and rationale | |
15 | ||
16 | Sensibly, this integration would be deferred to a SASL library, but none | |
17 | of them appear to offer keytab file selection interfaces in their APIs. It | |
18 | might be that this driver only requires minor modification to work with MIT | |
19 | Kerberos. | |
20 | ||
21 | Heimdal provides a number of interfaces for various forms of authentication. | |
22 | As GS2 does not appear to provide keytab control interfaces either, we may | |
23 | end up supporting that too. It's possible that we could trivially expand to | |
24 | support NTLM support via Heimdal, etc. Rather than try to be too generic | |
25 | immediately, this driver is directly only supporting GSSAPI. | |
26 | ||
27 | Without rename, we could add an option for GS2 support in the future. | |
28 | */ | |
29 | ||
30 | /* Sources | |
31 | ||
32 | * mailcheck-imap (Perl, client-side, written by me years ago) | |
33 | * gsasl driver (GPL, server-side) | |
34 | * heimdal sources and man-pages, plus http://www.h5l.org/manual/ | |
35 | * FreeBSD man-pages (very informative!) | |
36 | * http://www.ggf.org/documents/GFD.24.pdf confirming GSS_KRB5_REGISTER_ACCEPTOR_IDENTITY_X | |
b245b4a5 PP |
37 | semantics, that found by browsing Heimdal source to find how to set the keytab; however, |
38 | after multiple attempts I failed to get that to work and instead switched to | |
39 | gsskrb5_register_acceptor_identity(). | |
dde3daac PP |
40 | */ |
41 | ||
42 | #include "../exim.h" | |
43 | ||
44 | #ifndef AUTH_HEIMDAL_GSSAPI | |
45 | /* dummy function to satisfy compilers when we link in an "empty" file. */ | |
e1d15f5e JH |
46 | static void dummy(int x); |
47 | static void dummy2(int x) { dummy(x-1); } | |
48 | static void dummy(int x) { dummy2(x-1); } | |
dde3daac PP |
49 | #else |
50 | ||
51 | #include <gssapi/gssapi.h> | |
52 | #include <gssapi/gssapi_krb5.h> | |
53 | ||
54 | /* for the _init debugging */ | |
55 | #include <krb5.h> | |
56 | ||
dde3daac PP |
57 | #include "heimdal_gssapi.h" |
58 | ||
59 | /* Authenticator-specific options. */ | |
60 | optionlist auth_heimdal_gssapi_options[] = { | |
61 | { "server_hostname", opt_stringptr, | |
62 | (void *)(offsetof(auth_heimdal_gssapi_options_block, server_hostname)) }, | |
63 | { "server_keytab", opt_stringptr, | |
64 | (void *)(offsetof(auth_heimdal_gssapi_options_block, server_keytab)) }, | |
dde3daac PP |
65 | { "server_service", opt_stringptr, |
66 | (void *)(offsetof(auth_heimdal_gssapi_options_block, server_service)) } | |
67 | }; | |
68 | ||
69 | int auth_heimdal_gssapi_options_count = | |
70 | sizeof(auth_heimdal_gssapi_options)/sizeof(optionlist); | |
71 | ||
72 | /* Defaults for the authenticator-specific options. */ | |
73 | auth_heimdal_gssapi_options_block auth_heimdal_gssapi_option_defaults = { | |
74 | US"$primary_hostname", /* server_hostname */ | |
75 | NULL, /* server_keytab */ | |
dde3daac PP |
76 | US"smtp", /* server_service */ |
77 | }; | |
78 | ||
79 | /* "Globals" for managing the heimdal_gssapi interface. */ | |
80 | ||
dde3daac PP |
81 | /* Utility functions */ |
82 | static void | |
83 | exim_heimdal_error_debug(const char *, krb5_context, krb5_error_code); | |
84 | static int | |
85 | exim_gssapi_error_defer(uschar *, OM_uint32, OM_uint32, const char *, ...) | |
86 | PRINTF_FUNCTION(4, 5); | |
87 | ||
88 | #define EmptyBuf(buf) do { buf.value = NULL; buf.length = 0; } while (0) | |
89 | ||
90 | ||
91 | /************************************************* | |
92 | * Initialization entry point * | |
93 | *************************************************/ | |
94 | ||
95 | /* Called for each instance, after its options have been read, to | |
96 | enable consistency checks to be done, or anything else that needs | |
97 | to be set up. */ | |
98 | ||
b245b4a5 PP |
99 | /* Heimdal provides a GSSAPI extension method for setting the keytab; |
100 | in the init, we mostly just use raw krb5 methods so that we can report | |
dde3daac PP |
101 | the keytab contents, for -D+auth debugging. */ |
102 | ||
103 | void | |
104 | auth_heimdal_gssapi_init(auth_instance *ablock) | |
105 | { | |
106 | krb5_context context; | |
107 | krb5_keytab keytab; | |
108 | krb5_kt_cursor cursor; | |
109 | krb5_keytab_entry entry; | |
110 | krb5_error_code krc; | |
111 | char *principal, *enctype_s; | |
112 | const char *k_keytab_typed_name = NULL; | |
113 | auth_heimdal_gssapi_options_block *ob = | |
114 | (auth_heimdal_gssapi_options_block *)(ablock->options_block); | |
115 | ||
116 | ablock->server = FALSE; | |
117 | ablock->client = FALSE; | |
118 | ||
119 | if (!ob->server_service || !*ob->server_service) { | |
120 | HDEBUG(D_auth) debug_printf("heimdal: missing server_service\n"); | |
121 | return; | |
122 | } | |
123 | ||
124 | krc = krb5_init_context(&context); | |
125 | if (krc != 0) { | |
126 | int kerr = errno; | |
127 | HDEBUG(D_auth) debug_printf("heimdal: failed to initialise krb5 context: %s\n", | |
128 | strerror(kerr)); | |
129 | return; | |
130 | } | |
131 | ||
132 | if (ob->server_keytab) { | |
133 | k_keytab_typed_name = CCS string_sprintf("file:%s", expand_string(ob->server_keytab)); | |
134 | HDEBUG(D_auth) debug_printf("heimdal: using keytab %s\n", k_keytab_typed_name); | |
135 | krc = krb5_kt_resolve(context, k_keytab_typed_name, &keytab); | |
136 | if (krc) { | |
137 | HDEBUG(D_auth) exim_heimdal_error_debug("krb5_kt_resolve", context, krc); | |
138 | return; | |
139 | } | |
140 | } else { | |
141 | HDEBUG(D_auth) debug_printf("heimdal: using system default keytab\n"); | |
142 | krc = krb5_kt_default(context, &keytab); | |
143 | if (krc) { | |
144 | HDEBUG(D_auth) exim_heimdal_error_debug("krb5_kt_default", context, krc); | |
145 | return; | |
146 | } | |
147 | } | |
148 | ||
149 | HDEBUG(D_auth) { | |
150 | /* http://www.h5l.org/manual/HEAD/krb5/krb5_keytab_intro.html */ | |
151 | krc = krb5_kt_start_seq_get(context, keytab, &cursor); | |
152 | if (krc) | |
153 | exim_heimdal_error_debug("krb5_kt_start_seq_get", context, krc); | |
154 | else { | |
155 | while ((krc = krb5_kt_next_entry(context, keytab, &entry, &cursor)) == 0) { | |
156 | principal = enctype_s = NULL; | |
157 | krb5_unparse_name(context, entry.principal, &principal); | |
158 | krb5_enctype_to_string(context, entry.keyblock.keytype, &enctype_s); | |
159 | debug_printf("heimdal: keytab principal: %s vno=%d type=%s\n", | |
160 | principal ? principal : "??", | |
161 | entry.vno, | |
162 | enctype_s ? enctype_s : "??"); | |
163 | free(principal); | |
164 | free(enctype_s); | |
165 | krb5_kt_free_entry(context, &entry); | |
166 | } | |
167 | krc = krb5_kt_end_seq_get(context, keytab, &cursor); | |
168 | if (krc) | |
169 | exim_heimdal_error_debug("krb5_kt_end_seq_get", context, krc); | |
170 | } | |
171 | } | |
172 | ||
173 | krc = krb5_kt_close(context, keytab); | |
174 | if (krc) | |
175 | HDEBUG(D_auth) exim_heimdal_error_debug("krb5_kt_close", context, krc); | |
176 | ||
177 | krb5_free_context(context); | |
178 | ||
179 | /* RFC 4121 section 5.2, SHOULD support 64K input buffers */ | |
180 | if (big_buffer_size < (64 * 1024)) { | |
181 | uschar *newbuf; | |
182 | big_buffer_size = 64 * 1024; | |
183 | newbuf = store_malloc(big_buffer_size); | |
184 | store_free(big_buffer); | |
185 | big_buffer = newbuf; | |
186 | } | |
187 | ||
188 | ablock->server = TRUE; | |
189 | } | |
190 | ||
191 | ||
192 | static void | |
193 | exim_heimdal_error_debug(const char *label, | |
194 | krb5_context context, krb5_error_code err) | |
195 | { | |
196 | const char *kerrsc; | |
197 | kerrsc = krb5_get_error_message(context, err); | |
198 | debug_printf("heimdal %s: %s\n", label, kerrsc ? kerrsc : "unknown error"); | |
199 | krb5_free_error_message(context, kerrsc); | |
200 | } | |
201 | ||
202 | /************************************************* | |
203 | * Server entry point * | |
204 | *************************************************/ | |
205 | ||
206 | /* For interface, see auths/README */ | |
207 | ||
208 | /* GSSAPI notes: | |
209 | OM_uint32: portable type for unsigned int32 | |
210 | gss_buffer_desc / *gss_buffer_t: hold/point-to size_t .length & void *value | |
211 | -- all strings/etc passed in should go through one of these | |
212 | -- when allocated by gssapi, release with gss_release_buffer() | |
213 | */ | |
214 | ||
215 | int | |
216 | auth_heimdal_gssapi_server(auth_instance *ablock, uschar *initial_data) | |
217 | { | |
218 | gss_name_t gclient = GSS_C_NO_NAME; | |
219 | gss_name_t gserver = GSS_C_NO_NAME; | |
220 | gss_cred_id_t gcred = GSS_C_NO_CREDENTIAL; | |
221 | gss_ctx_id_t gcontext = GSS_C_NO_CONTEXT; | |
222 | uschar *ex_server_str; | |
223 | gss_buffer_desc gbufdesc = GSS_C_EMPTY_BUFFER; | |
224 | gss_buffer_desc gbufdesc_in = GSS_C_EMPTY_BUFFER; | |
225 | gss_buffer_desc gbufdesc_out = GSS_C_EMPTY_BUFFER; | |
226 | gss_OID mech_type; | |
227 | OM_uint32 maj_stat, min_stat; | |
228 | int step, error_out, i; | |
229 | uschar *tmp1, *tmp2, *from_client; | |
230 | auth_heimdal_gssapi_options_block *ob = | |
231 | (auth_heimdal_gssapi_options_block *)(ablock->options_block); | |
232 | BOOL handled_empty_ir; | |
233 | uschar *store_reset_point; | |
f35771fe | 234 | uschar *keytab; |
dde3daac PP |
235 | uschar sasl_config[4]; |
236 | uschar requested_qop; | |
237 | ||
238 | store_reset_point = store_get(0); | |
239 | ||
240 | HDEBUG(D_auth) | |
241 | debug_printf("heimdal: initialising auth context for %s\n", ablock->name); | |
242 | ||
243 | /* Construct our gss_name_t gserver describing ourselves */ | |
244 | tmp1 = expand_string(ob->server_service); | |
245 | tmp2 = expand_string(ob->server_hostname); | |
246 | ex_server_str = string_sprintf("%s@%s", tmp1, tmp2); | |
247 | gbufdesc.value = (void *) ex_server_str; | |
248 | gbufdesc.length = Ustrlen(ex_server_str); | |
249 | maj_stat = gss_import_name(&min_stat, | |
250 | &gbufdesc, GSS_C_NT_HOSTBASED_SERVICE, &gserver); | |
251 | if (GSS_ERROR(maj_stat)) | |
252 | return exim_gssapi_error_defer(store_reset_point, maj_stat, min_stat, | |
253 | "gss_import_name(%s)", CS gbufdesc.value); | |
254 | ||
255 | /* Use a specific keytab, if specified */ | |
256 | if (ob->server_keytab) { | |
f35771fe PP |
257 | keytab = expand_string(ob->server_keytab); |
258 | maj_stat = gsskrb5_register_acceptor_identity(CCS keytab); | |
dde3daac PP |
259 | if (GSS_ERROR(maj_stat)) |
260 | return exim_gssapi_error_defer(store_reset_point, maj_stat, min_stat, | |
f35771fe PP |
261 | "registering keytab \"%s\"", keytab); |
262 | HDEBUG(D_auth) | |
263 | debug_printf("heimdal: using keytab \"%s\"\n", keytab); | |
dde3daac PP |
264 | } |
265 | ||
266 | /* Acquire our credentials */ | |
267 | maj_stat = gss_acquire_cred(&min_stat, | |
268 | gserver, /* desired name */ | |
269 | 0, /* time */ | |
270 | GSS_C_NULL_OID_SET, /* desired mechs */ | |
271 | GSS_C_ACCEPT, /* cred usage */ | |
272 | &gcred, /* handle */ | |
273 | NULL /* actual mechs */, | |
274 | NULL /* time rec */); | |
275 | if (GSS_ERROR(maj_stat)) | |
276 | return exim_gssapi_error_defer(store_reset_point, maj_stat, min_stat, | |
277 | "gss_acquire_cred(%s)", ex_server_str); | |
278 | ||
279 | maj_stat = gss_release_name(&min_stat, &gserver); | |
280 | ||
f35771fe PP |
281 | HDEBUG(D_auth) debug_printf("heimdal: have server credentials.\n"); |
282 | ||
dde3daac PP |
283 | /* Loop talking to client */ |
284 | step = 0; | |
285 | from_client = initial_data; | |
286 | handled_empty_ir = FALSE; | |
287 | error_out = OK; | |
288 | ||
289 | /* buffer sizes: auth_get_data() uses big_buffer, which we grow per | |
290 | GSSAPI RFC in _init, if needed, to meet the SHOULD size of 64KB. | |
291 | (big_buffer starts life at the MUST size of 16KB). */ | |
292 | ||
293 | /* step values | |
294 | 0: getting initial data from client to feed into GSSAPI | |
295 | 1: iterating for as long as GSS_S_CONTINUE_NEEDED | |
296 | 2: GSS_S_COMPLETE, SASL wrapping for authz and qop to send to client | |
297 | 3: unpick final auth message from client | |
298 | 4: break/finish (non-step) | |
299 | */ | |
300 | while (step < 4) { | |
301 | switch (step) { | |
302 | case 0: | |
303 | if (!from_client || *from_client == '\0') { | |
304 | if (handled_empty_ir) { | |
305 | HDEBUG(D_auth) debug_printf("gssapi: repeated empty input, grr.\n"); | |
306 | error_out = BAD64; | |
307 | goto ERROR_OUT; | |
308 | } else { | |
309 | HDEBUG(D_auth) debug_printf("gssapi: missing initial response, nudging.\n"); | |
310 | error_out = auth_get_data(&from_client, US"", 0); | |
311 | if (error_out != OK) | |
312 | goto ERROR_OUT; | |
b245b4a5 | 313 | handled_empty_ir = TRUE; |
dde3daac PP |
314 | continue; |
315 | } | |
316 | } | |
317 | /* We should now have the opening data from the client, base64-encoded. */ | |
318 | step += 1; | |
f35771fe | 319 | HDEBUG(D_auth) debug_printf("heimdal: have initial client data\n"); |
dde3daac PP |
320 | break; |
321 | ||
322 | case 1: | |
323 | gbufdesc_in.length = auth_b64decode(from_client, USS &gbufdesc_in.value); | |
324 | if (gclient) { | |
325 | maj_stat = gss_release_name(&min_stat, &gclient); | |
326 | gclient = GSS_C_NO_NAME; | |
327 | } | |
328 | maj_stat = gss_accept_sec_context(&min_stat, | |
329 | &gcontext, /* context handle */ | |
330 | gcred, /* acceptor cred handle */ | |
331 | &gbufdesc_in, /* input from client */ | |
332 | GSS_C_NO_CHANNEL_BINDINGS, /* XXX fixme: use the channel bindings from GnuTLS */ | |
333 | &gclient, /* client identifier */ | |
334 | &mech_type, /* mechanism in use */ | |
335 | &gbufdesc_out, /* output to send to client */ | |
336 | NULL, /* return flags */ | |
337 | NULL, /* time rec */ | |
338 | NULL /* delegated cred_handle */ | |
339 | ); | |
340 | if (GSS_ERROR(maj_stat)) { | |
341 | exim_gssapi_error_defer(NULL, maj_stat, min_stat, | |
342 | "gss_accept_sec_context()"); | |
343 | error_out = FAIL; | |
344 | goto ERROR_OUT; | |
345 | } | |
346 | if (&gbufdesc_out.length != 0) { | |
347 | error_out = auth_get_data(&from_client, | |
348 | gbufdesc_out.value, gbufdesc_out.length); | |
349 | if (error_out != OK) | |
350 | goto ERROR_OUT; | |
351 | ||
352 | gss_release_buffer(&min_stat, &gbufdesc_out); | |
353 | EmptyBuf(gbufdesc_out); | |
354 | } | |
f35771fe | 355 | if (maj_stat == GSS_S_COMPLETE) { |
dde3daac | 356 | step += 1; |
f35771fe PP |
357 | HDEBUG(D_auth) debug_printf("heimdal: GSS complete\n"); |
358 | } else { | |
359 | HDEBUG(D_auth) debug_printf("heimdal: need more data\n"); | |
360 | } | |
dde3daac PP |
361 | break; |
362 | ||
363 | case 2: | |
364 | memset(sasl_config, 0xFF, 4); | |
365 | /* draft-ietf-sasl-gssapi-06.txt defines bitmasks for first octet | |
366 | 0x01 No security layer | |
367 | 0x02 Integrity protection | |
368 | 0x04 Confidentiality protection | |
369 | ||
b245b4a5 | 370 | The remaining three octets are the maximum buffer size for wrapped |
dde3daac PP |
371 | content. */ |
372 | sasl_config[0] = 0x01; /* Exim does not wrap/unwrap SASL layers after auth */ | |
373 | gbufdesc.value = (void *) sasl_config; | |
374 | gbufdesc.length = 4; | |
375 | maj_stat = gss_wrap(&min_stat, | |
376 | gcontext, | |
377 | 0, /* conf_req_flag: integrity only */ | |
378 | GSS_C_QOP_DEFAULT, /* qop requested */ | |
379 | &gbufdesc, /* message to protect */ | |
380 | NULL, /* conf_state: no confidentiality applied */ | |
381 | &gbufdesc_out /* output buffer */ | |
382 | ); | |
383 | if (GSS_ERROR(maj_stat)) { | |
384 | exim_gssapi_error_defer(NULL, maj_stat, min_stat, | |
385 | "gss_wrap(SASL state after auth)"); | |
386 | error_out = FAIL; | |
387 | goto ERROR_OUT; | |
388 | } | |
f35771fe PP |
389 | |
390 | HDEBUG(D_auth) debug_printf("heimdal SASL: requesting QOP with no security layers\n"); | |
391 | ||
dde3daac PP |
392 | error_out = auth_get_data(&from_client, |
393 | gbufdesc_out.value, gbufdesc_out.length); | |
394 | if (error_out != OK) | |
395 | goto ERROR_OUT; | |
396 | ||
397 | gss_release_buffer(&min_stat, &gbufdesc_out); | |
398 | EmptyBuf(gbufdesc_out); | |
399 | step += 1; | |
400 | break; | |
401 | ||
402 | case 3: | |
403 | gbufdesc_in.length = auth_b64decode(from_client, USS &gbufdesc_in.value); | |
404 | maj_stat = gss_unwrap(&min_stat, | |
405 | gcontext, | |
406 | &gbufdesc_in, /* data from client */ | |
407 | &gbufdesc_out, /* results */ | |
408 | NULL, /* conf state */ | |
409 | NULL /* qop state */ | |
410 | ); | |
411 | if (GSS_ERROR(maj_stat)) { | |
412 | exim_gssapi_error_defer(NULL, maj_stat, min_stat, | |
413 | "gss_unwrap(final SASL message from client)"); | |
414 | error_out = FAIL; | |
415 | goto ERROR_OUT; | |
416 | } | |
c7955b11 | 417 | if (gbufdesc_out.length < 4) { |
dde3daac PP |
418 | HDEBUG(D_auth) |
419 | debug_printf("gssapi: final message too short; " | |
c7955b11 | 420 | "need flags, buf sizes and optional authzid\n"); |
dde3daac PP |
421 | error_out = FAIL; |
422 | goto ERROR_OUT; | |
423 | } | |
424 | ||
425 | requested_qop = (CS gbufdesc_out.value)[0]; | |
426 | if ((requested_qop & 0x01) == 0) { | |
427 | HDEBUG(D_auth) | |
428 | debug_printf("gssapi: client requested security layers (%x)\n", | |
429 | (unsigned int) requested_qop); | |
430 | error_out = FAIL; | |
431 | goto ERROR_OUT; | |
432 | } | |
433 | ||
434 | for (i = 0; i < AUTH_VARS; i++) auth_vars[i] = NULL; | |
435 | expand_nmax = 0; | |
436 | ||
437 | /* Identifiers: | |
438 | The SASL provided identifier is an unverified authzid. | |
c7955b11 PP |
439 | GSSAPI provides us with a verified identifier, but it might be empty |
440 | for some clients. | |
dde3daac PP |
441 | */ |
442 | ||
443 | /* $auth2 is authzid requested at SASL layer */ | |
c7955b11 PP |
444 | if (gbufdesc_out.length > 4) { |
445 | expand_nlength[2] = gbufdesc_out.length - 4; | |
446 | auth_vars[1] = expand_nstring[2] = | |
447 | string_copyn((US gbufdesc_out.value) + 4, expand_nlength[2]); | |
448 | expand_nmax = 2; | |
449 | } | |
dde3daac PP |
450 | |
451 | gss_release_buffer(&min_stat, &gbufdesc_out); | |
452 | EmptyBuf(gbufdesc_out); | |
453 | ||
454 | /* $auth1 is GSSAPI display name */ | |
455 | maj_stat = gss_display_name(&min_stat, | |
456 | gclient, | |
457 | &gbufdesc_out, | |
458 | &mech_type); | |
459 | if (GSS_ERROR(maj_stat)) { | |
460 | auth_vars[1] = expand_nstring[2] = NULL; | |
461 | expand_nmax = 0; | |
462 | exim_gssapi_error_defer(NULL, maj_stat, min_stat, | |
463 | "gss_display_name(client identifier)"); | |
464 | error_out = FAIL; | |
465 | goto ERROR_OUT; | |
466 | } | |
467 | ||
468 | expand_nlength[1] = gbufdesc_out.length; | |
469 | auth_vars[0] = expand_nstring[1] = | |
470 | string_copyn(gbufdesc_out.value, gbufdesc_out.length); | |
471 | ||
c7955b11 PP |
472 | if (expand_nmax == 0) { /* should be: authzid was empty */ |
473 | expand_nmax = 2; | |
474 | expand_nlength[2] = expand_nlength[1]; | |
475 | auth_vars[1] = expand_nstring[2] = string_copyn(expand_nstring[1], expand_nlength[1]); | |
476 | HDEBUG(D_auth) | |
477 | debug_printf("heimdal SASL: empty authzid, set to dup of GSSAPI display name\n"); | |
478 | } | |
479 | ||
f35771fe PP |
480 | HDEBUG(D_auth) |
481 | debug_printf("heimdal SASL: happy with client request\n" | |
482 | " auth1 (verified GSSAPI display-name): \"%s\"\n" | |
483 | " auth2 (unverified SASL requested authzid): \"%s\"\n", | |
484 | auth_vars[0], auth_vars[1]); | |
485 | ||
dde3daac PP |
486 | step += 1; |
487 | break; | |
488 | ||
489 | } /* switch */ | |
490 | } /* while step */ | |
491 | ||
492 | ||
493 | ERROR_OUT: | |
494 | maj_stat = gss_release_cred(&min_stat, &gcred); | |
495 | if (gclient) { | |
496 | gss_release_name(&min_stat, &gclient); | |
497 | gclient = GSS_C_NO_NAME; | |
498 | } | |
499 | if (gbufdesc_out.length) { | |
500 | gss_release_buffer(&min_stat, &gbufdesc_out); | |
501 | EmptyBuf(gbufdesc_out); | |
502 | } | |
503 | if (gcontext != GSS_C_NO_CONTEXT) { | |
504 | gss_delete_sec_context(&min_stat, &gcontext, GSS_C_NO_BUFFER); | |
505 | } | |
506 | ||
507 | store_reset(store_reset_point); | |
508 | ||
509 | if (error_out != OK) | |
510 | return error_out; | |
511 | ||
512 | /* Auth succeeded, check server_condition */ | |
513 | return auth_check_serv_cond(ablock); | |
514 | } | |
515 | ||
516 | ||
517 | static int | |
518 | exim_gssapi_error_defer(uschar *store_reset_point, | |
519 | OM_uint32 major, OM_uint32 minor, | |
520 | const char *format, ...) | |
521 | { | |
522 | va_list ap; | |
523 | uschar buffer[STRING_SPRINTF_BUFFER_SIZE]; | |
524 | OM_uint32 maj_stat, min_stat; | |
525 | OM_uint32 msgcontext = 0; | |
526 | gss_buffer_desc status_string; | |
527 | ||
528 | va_start(ap, format); | |
529 | if (!string_vformat(buffer, sizeof(buffer), format, ap)) | |
530 | log_write(0, LOG_MAIN|LOG_PANIC_DIE, | |
438257ba | 531 | "exim_gssapi_error_defer expansion larger than %lu", |
dde3daac PP |
532 | sizeof(buffer)); |
533 | va_end(ap); | |
534 | ||
535 | auth_defer_msg = NULL; | |
536 | ||
537 | do { | |
538 | maj_stat = gss_display_status(&min_stat, | |
539 | major, GSS_C_GSS_CODE, GSS_C_NO_OID, | |
540 | &msgcontext, &status_string); | |
541 | ||
542 | if (auth_defer_msg == NULL) { | |
543 | auth_defer_msg = string_copy(US status_string.value); | |
544 | } | |
545 | ||
546 | HDEBUG(D_auth) debug_printf("heimdal %s: %.*s\n", | |
547 | buffer, (int)status_string.length, CS status_string.value); | |
548 | gss_release_buffer(&min_stat, &status_string); | |
549 | ||
550 | } while (msgcontext != 0); | |
551 | ||
552 | if (store_reset_point) | |
553 | store_reset(store_reset_point); | |
554 | return DEFER; | |
555 | } | |
556 | ||
557 | ||
558 | /************************************************* | |
559 | * Client entry point * | |
560 | *************************************************/ | |
561 | ||
562 | /* For interface, see auths/README */ | |
563 | ||
564 | int | |
565 | auth_heimdal_gssapi_client( | |
566 | auth_instance *ablock, /* authenticator block */ | |
567 | smtp_inblock *inblock, /* connection inblock */ | |
568 | smtp_outblock *outblock, /* connection outblock */ | |
569 | int timeout, /* command timeout */ | |
570 | uschar *buffer, /* buffer for reading response */ | |
571 | int buffsize) /* size of buffer */ | |
572 | { | |
573 | HDEBUG(D_auth) | |
574 | debug_printf("Client side NOT IMPLEMENTED: you should not see this!\n"); | |
575 | /* NOT IMPLEMENTED */ | |
576 | return FAIL; | |
577 | } | |
578 | ||
579 | /************************************************* | |
580 | * Diagnostic API * | |
581 | *************************************************/ | |
582 | ||
583 | void | |
584 | auth_heimdal_gssapi_version_report(FILE *f) | |
585 | { | |
586 | /* No build-time constants available unless we link against libraries at | |
587 | build-time and export the result as a string into a header ourselves. */ | |
588 | fprintf(f, "Library version: Heimdal: Runtime: %s\n" | |
589 | " Build Info: %s\n", | |
590 | heimdal_version, heimdal_long_version); | |
591 | } | |
592 | ||
593 | #endif /* AUTH_HEIMDAL_GSSAPI */ | |
594 | ||
595 | /* End of heimdal_gssapi.c */ |