Commit | Line | Data |
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dde3daac PP |
1 | /************************************************* |
2 | * Exim - an Internet mail transport agent * | |
3 | *************************************************/ | |
4 | ||
80fea873 | 5 | /* Copyright (c) University of Cambridge 1995 - 2016 */ |
dde3daac PP |
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 | ||
d185889f JH |
79 | |
80 | #ifdef MACRO_PREDEF | |
81 | ||
82 | /* Dummy values */ | |
83 | void auth_heimdal_init(auth_instance *ablock) {} | |
84 | int auth_heimdal_server(auth_instance *ablock, uschar *data) {return 0;} | |
85 | int auth_heimdal_client(auth_instance *ablock, smtp_inblock *inblock, | |
86 | smtp_outblock *outblock, int timeout, uschar *buffer, int buffsize) {return 0;} | |
87 | ||
88 | #else /*!MACRO_PREDEF*/ | |
89 | ||
90 | ||
91 | ||
dde3daac PP |
92 | /* "Globals" for managing the heimdal_gssapi interface. */ |
93 | ||
dde3daac PP |
94 | /* Utility functions */ |
95 | static void | |
96 | exim_heimdal_error_debug(const char *, krb5_context, krb5_error_code); | |
97 | static int | |
98 | exim_gssapi_error_defer(uschar *, OM_uint32, OM_uint32, const char *, ...) | |
99 | PRINTF_FUNCTION(4, 5); | |
100 | ||
101 | #define EmptyBuf(buf) do { buf.value = NULL; buf.length = 0; } while (0) | |
102 | ||
103 | ||
104 | /************************************************* | |
105 | * Initialization entry point * | |
106 | *************************************************/ | |
107 | ||
108 | /* Called for each instance, after its options have been read, to | |
109 | enable consistency checks to be done, or anything else that needs | |
110 | to be set up. */ | |
111 | ||
b245b4a5 PP |
112 | /* Heimdal provides a GSSAPI extension method for setting the keytab; |
113 | in the init, we mostly just use raw krb5 methods so that we can report | |
dde3daac PP |
114 | the keytab contents, for -D+auth debugging. */ |
115 | ||
116 | void | |
117 | auth_heimdal_gssapi_init(auth_instance *ablock) | |
118 | { | |
119 | krb5_context context; | |
120 | krb5_keytab keytab; | |
121 | krb5_kt_cursor cursor; | |
122 | krb5_keytab_entry entry; | |
123 | krb5_error_code krc; | |
124 | char *principal, *enctype_s; | |
125 | const char *k_keytab_typed_name = NULL; | |
126 | auth_heimdal_gssapi_options_block *ob = | |
127 | (auth_heimdal_gssapi_options_block *)(ablock->options_block); | |
128 | ||
129 | ablock->server = FALSE; | |
130 | ablock->client = FALSE; | |
131 | ||
132 | if (!ob->server_service || !*ob->server_service) { | |
133 | HDEBUG(D_auth) debug_printf("heimdal: missing server_service\n"); | |
134 | return; | |
135 | } | |
136 | ||
137 | krc = krb5_init_context(&context); | |
138 | if (krc != 0) { | |
139 | int kerr = errno; | |
140 | HDEBUG(D_auth) debug_printf("heimdal: failed to initialise krb5 context: %s\n", | |
141 | strerror(kerr)); | |
142 | return; | |
143 | } | |
144 | ||
145 | if (ob->server_keytab) { | |
146 | k_keytab_typed_name = CCS string_sprintf("file:%s", expand_string(ob->server_keytab)); | |
147 | HDEBUG(D_auth) debug_printf("heimdal: using keytab %s\n", k_keytab_typed_name); | |
148 | krc = krb5_kt_resolve(context, k_keytab_typed_name, &keytab); | |
149 | if (krc) { | |
150 | HDEBUG(D_auth) exim_heimdal_error_debug("krb5_kt_resolve", context, krc); | |
151 | return; | |
152 | } | |
153 | } else { | |
154 | HDEBUG(D_auth) debug_printf("heimdal: using system default keytab\n"); | |
155 | krc = krb5_kt_default(context, &keytab); | |
156 | if (krc) { | |
157 | HDEBUG(D_auth) exim_heimdal_error_debug("krb5_kt_default", context, krc); | |
158 | return; | |
159 | } | |
160 | } | |
161 | ||
162 | HDEBUG(D_auth) { | |
163 | /* http://www.h5l.org/manual/HEAD/krb5/krb5_keytab_intro.html */ | |
164 | krc = krb5_kt_start_seq_get(context, keytab, &cursor); | |
165 | if (krc) | |
166 | exim_heimdal_error_debug("krb5_kt_start_seq_get", context, krc); | |
167 | else { | |
168 | while ((krc = krb5_kt_next_entry(context, keytab, &entry, &cursor)) == 0) { | |
169 | principal = enctype_s = NULL; | |
170 | krb5_unparse_name(context, entry.principal, &principal); | |
171 | krb5_enctype_to_string(context, entry.keyblock.keytype, &enctype_s); | |
172 | debug_printf("heimdal: keytab principal: %s vno=%d type=%s\n", | |
173 | principal ? principal : "??", | |
174 | entry.vno, | |
175 | enctype_s ? enctype_s : "??"); | |
176 | free(principal); | |
177 | free(enctype_s); | |
178 | krb5_kt_free_entry(context, &entry); | |
179 | } | |
180 | krc = krb5_kt_end_seq_get(context, keytab, &cursor); | |
181 | if (krc) | |
182 | exim_heimdal_error_debug("krb5_kt_end_seq_get", context, krc); | |
183 | } | |
184 | } | |
185 | ||
186 | krc = krb5_kt_close(context, keytab); | |
187 | if (krc) | |
188 | HDEBUG(D_auth) exim_heimdal_error_debug("krb5_kt_close", context, krc); | |
189 | ||
190 | krb5_free_context(context); | |
191 | ||
192 | /* RFC 4121 section 5.2, SHOULD support 64K input buffers */ | |
193 | if (big_buffer_size < (64 * 1024)) { | |
194 | uschar *newbuf; | |
195 | big_buffer_size = 64 * 1024; | |
196 | newbuf = store_malloc(big_buffer_size); | |
197 | store_free(big_buffer); | |
198 | big_buffer = newbuf; | |
199 | } | |
200 | ||
201 | ablock->server = TRUE; | |
202 | } | |
203 | ||
204 | ||
205 | static void | |
206 | exim_heimdal_error_debug(const char *label, | |
207 | krb5_context context, krb5_error_code err) | |
208 | { | |
209 | const char *kerrsc; | |
210 | kerrsc = krb5_get_error_message(context, err); | |
211 | debug_printf("heimdal %s: %s\n", label, kerrsc ? kerrsc : "unknown error"); | |
212 | krb5_free_error_message(context, kerrsc); | |
213 | } | |
214 | ||
215 | /************************************************* | |
216 | * Server entry point * | |
217 | *************************************************/ | |
218 | ||
219 | /* For interface, see auths/README */ | |
220 | ||
221 | /* GSSAPI notes: | |
222 | OM_uint32: portable type for unsigned int32 | |
223 | gss_buffer_desc / *gss_buffer_t: hold/point-to size_t .length & void *value | |
224 | -- all strings/etc passed in should go through one of these | |
225 | -- when allocated by gssapi, release with gss_release_buffer() | |
226 | */ | |
227 | ||
228 | int | |
229 | auth_heimdal_gssapi_server(auth_instance *ablock, uschar *initial_data) | |
230 | { | |
231 | gss_name_t gclient = GSS_C_NO_NAME; | |
232 | gss_name_t gserver = GSS_C_NO_NAME; | |
233 | gss_cred_id_t gcred = GSS_C_NO_CREDENTIAL; | |
234 | gss_ctx_id_t gcontext = GSS_C_NO_CONTEXT; | |
235 | uschar *ex_server_str; | |
236 | gss_buffer_desc gbufdesc = GSS_C_EMPTY_BUFFER; | |
237 | gss_buffer_desc gbufdesc_in = GSS_C_EMPTY_BUFFER; | |
238 | gss_buffer_desc gbufdesc_out = GSS_C_EMPTY_BUFFER; | |
239 | gss_OID mech_type; | |
240 | OM_uint32 maj_stat, min_stat; | |
241 | int step, error_out, i; | |
242 | uschar *tmp1, *tmp2, *from_client; | |
243 | auth_heimdal_gssapi_options_block *ob = | |
244 | (auth_heimdal_gssapi_options_block *)(ablock->options_block); | |
245 | BOOL handled_empty_ir; | |
246 | uschar *store_reset_point; | |
f35771fe | 247 | uschar *keytab; |
dde3daac PP |
248 | uschar sasl_config[4]; |
249 | uschar requested_qop; | |
250 | ||
251 | store_reset_point = store_get(0); | |
252 | ||
253 | HDEBUG(D_auth) | |
254 | debug_printf("heimdal: initialising auth context for %s\n", ablock->name); | |
255 | ||
256 | /* Construct our gss_name_t gserver describing ourselves */ | |
257 | tmp1 = expand_string(ob->server_service); | |
258 | tmp2 = expand_string(ob->server_hostname); | |
259 | ex_server_str = string_sprintf("%s@%s", tmp1, tmp2); | |
260 | gbufdesc.value = (void *) ex_server_str; | |
261 | gbufdesc.length = Ustrlen(ex_server_str); | |
262 | maj_stat = gss_import_name(&min_stat, | |
263 | &gbufdesc, GSS_C_NT_HOSTBASED_SERVICE, &gserver); | |
264 | if (GSS_ERROR(maj_stat)) | |
265 | return exim_gssapi_error_defer(store_reset_point, maj_stat, min_stat, | |
266 | "gss_import_name(%s)", CS gbufdesc.value); | |
267 | ||
268 | /* Use a specific keytab, if specified */ | |
269 | if (ob->server_keytab) { | |
f35771fe PP |
270 | keytab = expand_string(ob->server_keytab); |
271 | maj_stat = gsskrb5_register_acceptor_identity(CCS keytab); | |
dde3daac PP |
272 | if (GSS_ERROR(maj_stat)) |
273 | return exim_gssapi_error_defer(store_reset_point, maj_stat, min_stat, | |
f35771fe PP |
274 | "registering keytab \"%s\"", keytab); |
275 | HDEBUG(D_auth) | |
276 | debug_printf("heimdal: using keytab \"%s\"\n", keytab); | |
dde3daac PP |
277 | } |
278 | ||
279 | /* Acquire our credentials */ | |
280 | maj_stat = gss_acquire_cred(&min_stat, | |
281 | gserver, /* desired name */ | |
282 | 0, /* time */ | |
283 | GSS_C_NULL_OID_SET, /* desired mechs */ | |
284 | GSS_C_ACCEPT, /* cred usage */ | |
285 | &gcred, /* handle */ | |
286 | NULL /* actual mechs */, | |
287 | NULL /* time rec */); | |
288 | if (GSS_ERROR(maj_stat)) | |
289 | return exim_gssapi_error_defer(store_reset_point, maj_stat, min_stat, | |
290 | "gss_acquire_cred(%s)", ex_server_str); | |
291 | ||
292 | maj_stat = gss_release_name(&min_stat, &gserver); | |
293 | ||
f35771fe PP |
294 | HDEBUG(D_auth) debug_printf("heimdal: have server credentials.\n"); |
295 | ||
dde3daac PP |
296 | /* Loop talking to client */ |
297 | step = 0; | |
298 | from_client = initial_data; | |
299 | handled_empty_ir = FALSE; | |
300 | error_out = OK; | |
301 | ||
302 | /* buffer sizes: auth_get_data() uses big_buffer, which we grow per | |
303 | GSSAPI RFC in _init, if needed, to meet the SHOULD size of 64KB. | |
304 | (big_buffer starts life at the MUST size of 16KB). */ | |
305 | ||
306 | /* step values | |
307 | 0: getting initial data from client to feed into GSSAPI | |
308 | 1: iterating for as long as GSS_S_CONTINUE_NEEDED | |
309 | 2: GSS_S_COMPLETE, SASL wrapping for authz and qop to send to client | |
310 | 3: unpick final auth message from client | |
311 | 4: break/finish (non-step) | |
312 | */ | |
313 | while (step < 4) { | |
314 | switch (step) { | |
315 | case 0: | |
316 | if (!from_client || *from_client == '\0') { | |
317 | if (handled_empty_ir) { | |
318 | HDEBUG(D_auth) debug_printf("gssapi: repeated empty input, grr.\n"); | |
319 | error_out = BAD64; | |
320 | goto ERROR_OUT; | |
321 | } else { | |
322 | HDEBUG(D_auth) debug_printf("gssapi: missing initial response, nudging.\n"); | |
323 | error_out = auth_get_data(&from_client, US"", 0); | |
324 | if (error_out != OK) | |
325 | goto ERROR_OUT; | |
b245b4a5 | 326 | handled_empty_ir = TRUE; |
dde3daac PP |
327 | continue; |
328 | } | |
329 | } | |
330 | /* We should now have the opening data from the client, base64-encoded. */ | |
331 | step += 1; | |
f35771fe | 332 | HDEBUG(D_auth) debug_printf("heimdal: have initial client data\n"); |
dde3daac PP |
333 | break; |
334 | ||
335 | case 1: | |
f4d091fb | 336 | gbufdesc_in.length = b64decode(from_client, USS &gbufdesc_in.value); |
dde3daac PP |
337 | if (gclient) { |
338 | maj_stat = gss_release_name(&min_stat, &gclient); | |
339 | gclient = GSS_C_NO_NAME; | |
340 | } | |
341 | maj_stat = gss_accept_sec_context(&min_stat, | |
342 | &gcontext, /* context handle */ | |
343 | gcred, /* acceptor cred handle */ | |
344 | &gbufdesc_in, /* input from client */ | |
345 | GSS_C_NO_CHANNEL_BINDINGS, /* XXX fixme: use the channel bindings from GnuTLS */ | |
346 | &gclient, /* client identifier */ | |
347 | &mech_type, /* mechanism in use */ | |
348 | &gbufdesc_out, /* output to send to client */ | |
349 | NULL, /* return flags */ | |
350 | NULL, /* time rec */ | |
351 | NULL /* delegated cred_handle */ | |
352 | ); | |
353 | if (GSS_ERROR(maj_stat)) { | |
354 | exim_gssapi_error_defer(NULL, maj_stat, min_stat, | |
355 | "gss_accept_sec_context()"); | |
356 | error_out = FAIL; | |
357 | goto ERROR_OUT; | |
358 | } | |
359 | if (&gbufdesc_out.length != 0) { | |
360 | error_out = auth_get_data(&from_client, | |
361 | gbufdesc_out.value, gbufdesc_out.length); | |
362 | if (error_out != OK) | |
363 | goto ERROR_OUT; | |
364 | ||
365 | gss_release_buffer(&min_stat, &gbufdesc_out); | |
366 | EmptyBuf(gbufdesc_out); | |
367 | } | |
f35771fe | 368 | if (maj_stat == GSS_S_COMPLETE) { |
dde3daac | 369 | step += 1; |
f35771fe PP |
370 | HDEBUG(D_auth) debug_printf("heimdal: GSS complete\n"); |
371 | } else { | |
372 | HDEBUG(D_auth) debug_printf("heimdal: need more data\n"); | |
373 | } | |
dde3daac PP |
374 | break; |
375 | ||
376 | case 2: | |
377 | memset(sasl_config, 0xFF, 4); | |
378 | /* draft-ietf-sasl-gssapi-06.txt defines bitmasks for first octet | |
379 | 0x01 No security layer | |
380 | 0x02 Integrity protection | |
381 | 0x04 Confidentiality protection | |
382 | ||
b245b4a5 | 383 | The remaining three octets are the maximum buffer size for wrapped |
dde3daac PP |
384 | content. */ |
385 | sasl_config[0] = 0x01; /* Exim does not wrap/unwrap SASL layers after auth */ | |
386 | gbufdesc.value = (void *) sasl_config; | |
387 | gbufdesc.length = 4; | |
388 | maj_stat = gss_wrap(&min_stat, | |
389 | gcontext, | |
390 | 0, /* conf_req_flag: integrity only */ | |
391 | GSS_C_QOP_DEFAULT, /* qop requested */ | |
392 | &gbufdesc, /* message to protect */ | |
393 | NULL, /* conf_state: no confidentiality applied */ | |
394 | &gbufdesc_out /* output buffer */ | |
395 | ); | |
396 | if (GSS_ERROR(maj_stat)) { | |
397 | exim_gssapi_error_defer(NULL, maj_stat, min_stat, | |
398 | "gss_wrap(SASL state after auth)"); | |
399 | error_out = FAIL; | |
400 | goto ERROR_OUT; | |
401 | } | |
f35771fe PP |
402 | |
403 | HDEBUG(D_auth) debug_printf("heimdal SASL: requesting QOP with no security layers\n"); | |
404 | ||
dde3daac PP |
405 | error_out = auth_get_data(&from_client, |
406 | gbufdesc_out.value, gbufdesc_out.length); | |
407 | if (error_out != OK) | |
408 | goto ERROR_OUT; | |
409 | ||
410 | gss_release_buffer(&min_stat, &gbufdesc_out); | |
411 | EmptyBuf(gbufdesc_out); | |
412 | step += 1; | |
413 | break; | |
414 | ||
415 | case 3: | |
f4d091fb | 416 | gbufdesc_in.length = b64decode(from_client, USS &gbufdesc_in.value); |
dde3daac PP |
417 | maj_stat = gss_unwrap(&min_stat, |
418 | gcontext, | |
419 | &gbufdesc_in, /* data from client */ | |
420 | &gbufdesc_out, /* results */ | |
421 | NULL, /* conf state */ | |
422 | NULL /* qop state */ | |
423 | ); | |
424 | if (GSS_ERROR(maj_stat)) { | |
425 | exim_gssapi_error_defer(NULL, maj_stat, min_stat, | |
426 | "gss_unwrap(final SASL message from client)"); | |
427 | error_out = FAIL; | |
428 | goto ERROR_OUT; | |
429 | } | |
c7955b11 | 430 | if (gbufdesc_out.length < 4) { |
dde3daac PP |
431 | HDEBUG(D_auth) |
432 | debug_printf("gssapi: final message too short; " | |
c7955b11 | 433 | "need flags, buf sizes and optional authzid\n"); |
dde3daac PP |
434 | error_out = FAIL; |
435 | goto ERROR_OUT; | |
436 | } | |
437 | ||
438 | requested_qop = (CS gbufdesc_out.value)[0]; | |
439 | if ((requested_qop & 0x01) == 0) { | |
440 | HDEBUG(D_auth) | |
441 | debug_printf("gssapi: client requested security layers (%x)\n", | |
442 | (unsigned int) requested_qop); | |
443 | error_out = FAIL; | |
444 | goto ERROR_OUT; | |
445 | } | |
446 | ||
447 | for (i = 0; i < AUTH_VARS; i++) auth_vars[i] = NULL; | |
448 | expand_nmax = 0; | |
449 | ||
450 | /* Identifiers: | |
451 | The SASL provided identifier is an unverified authzid. | |
c7955b11 PP |
452 | GSSAPI provides us with a verified identifier, but it might be empty |
453 | for some clients. | |
dde3daac PP |
454 | */ |
455 | ||
456 | /* $auth2 is authzid requested at SASL layer */ | |
c7955b11 PP |
457 | if (gbufdesc_out.length > 4) { |
458 | expand_nlength[2] = gbufdesc_out.length - 4; | |
459 | auth_vars[1] = expand_nstring[2] = | |
460 | string_copyn((US gbufdesc_out.value) + 4, expand_nlength[2]); | |
461 | expand_nmax = 2; | |
462 | } | |
dde3daac PP |
463 | |
464 | gss_release_buffer(&min_stat, &gbufdesc_out); | |
465 | EmptyBuf(gbufdesc_out); | |
466 | ||
467 | /* $auth1 is GSSAPI display name */ | |
468 | maj_stat = gss_display_name(&min_stat, | |
469 | gclient, | |
470 | &gbufdesc_out, | |
471 | &mech_type); | |
472 | if (GSS_ERROR(maj_stat)) { | |
473 | auth_vars[1] = expand_nstring[2] = NULL; | |
474 | expand_nmax = 0; | |
475 | exim_gssapi_error_defer(NULL, maj_stat, min_stat, | |
476 | "gss_display_name(client identifier)"); | |
477 | error_out = FAIL; | |
478 | goto ERROR_OUT; | |
479 | } | |
480 | ||
481 | expand_nlength[1] = gbufdesc_out.length; | |
482 | auth_vars[0] = expand_nstring[1] = | |
483 | string_copyn(gbufdesc_out.value, gbufdesc_out.length); | |
484 | ||
c7955b11 PP |
485 | if (expand_nmax == 0) { /* should be: authzid was empty */ |
486 | expand_nmax = 2; | |
487 | expand_nlength[2] = expand_nlength[1]; | |
488 | auth_vars[1] = expand_nstring[2] = string_copyn(expand_nstring[1], expand_nlength[1]); | |
489 | HDEBUG(D_auth) | |
490 | debug_printf("heimdal SASL: empty authzid, set to dup of GSSAPI display name\n"); | |
491 | } | |
492 | ||
f35771fe PP |
493 | HDEBUG(D_auth) |
494 | debug_printf("heimdal SASL: happy with client request\n" | |
495 | " auth1 (verified GSSAPI display-name): \"%s\"\n" | |
496 | " auth2 (unverified SASL requested authzid): \"%s\"\n", | |
497 | auth_vars[0], auth_vars[1]); | |
498 | ||
dde3daac PP |
499 | step += 1; |
500 | break; | |
501 | ||
502 | } /* switch */ | |
503 | } /* while step */ | |
504 | ||
505 | ||
506 | ERROR_OUT: | |
507 | maj_stat = gss_release_cred(&min_stat, &gcred); | |
508 | if (gclient) { | |
509 | gss_release_name(&min_stat, &gclient); | |
510 | gclient = GSS_C_NO_NAME; | |
511 | } | |
512 | if (gbufdesc_out.length) { | |
513 | gss_release_buffer(&min_stat, &gbufdesc_out); | |
514 | EmptyBuf(gbufdesc_out); | |
515 | } | |
516 | if (gcontext != GSS_C_NO_CONTEXT) { | |
517 | gss_delete_sec_context(&min_stat, &gcontext, GSS_C_NO_BUFFER); | |
518 | } | |
519 | ||
520 | store_reset(store_reset_point); | |
521 | ||
522 | if (error_out != OK) | |
523 | return error_out; | |
524 | ||
525 | /* Auth succeeded, check server_condition */ | |
526 | return auth_check_serv_cond(ablock); | |
527 | } | |
528 | ||
529 | ||
530 | static int | |
531 | exim_gssapi_error_defer(uschar *store_reset_point, | |
532 | OM_uint32 major, OM_uint32 minor, | |
533 | const char *format, ...) | |
534 | { | |
535 | va_list ap; | |
536 | uschar buffer[STRING_SPRINTF_BUFFER_SIZE]; | |
537 | OM_uint32 maj_stat, min_stat; | |
538 | OM_uint32 msgcontext = 0; | |
539 | gss_buffer_desc status_string; | |
540 | ||
541 | va_start(ap, format); | |
542 | if (!string_vformat(buffer, sizeof(buffer), format, ap)) | |
543 | log_write(0, LOG_MAIN|LOG_PANIC_DIE, | |
438257ba | 544 | "exim_gssapi_error_defer expansion larger than %lu", |
dde3daac PP |
545 | sizeof(buffer)); |
546 | va_end(ap); | |
547 | ||
548 | auth_defer_msg = NULL; | |
549 | ||
550 | do { | |
551 | maj_stat = gss_display_status(&min_stat, | |
552 | major, GSS_C_GSS_CODE, GSS_C_NO_OID, | |
553 | &msgcontext, &status_string); | |
554 | ||
555 | if (auth_defer_msg == NULL) { | |
556 | auth_defer_msg = string_copy(US status_string.value); | |
557 | } | |
558 | ||
559 | HDEBUG(D_auth) debug_printf("heimdal %s: %.*s\n", | |
560 | buffer, (int)status_string.length, CS status_string.value); | |
561 | gss_release_buffer(&min_stat, &status_string); | |
562 | ||
563 | } while (msgcontext != 0); | |
564 | ||
565 | if (store_reset_point) | |
566 | store_reset(store_reset_point); | |
567 | return DEFER; | |
568 | } | |
569 | ||
570 | ||
571 | /************************************************* | |
572 | * Client entry point * | |
573 | *************************************************/ | |
574 | ||
575 | /* For interface, see auths/README */ | |
576 | ||
577 | int | |
578 | auth_heimdal_gssapi_client( | |
579 | auth_instance *ablock, /* authenticator block */ | |
580 | smtp_inblock *inblock, /* connection inblock */ | |
581 | smtp_outblock *outblock, /* connection outblock */ | |
582 | int timeout, /* command timeout */ | |
583 | uschar *buffer, /* buffer for reading response */ | |
584 | int buffsize) /* size of buffer */ | |
585 | { | |
586 | HDEBUG(D_auth) | |
587 | debug_printf("Client side NOT IMPLEMENTED: you should not see this!\n"); | |
588 | /* NOT IMPLEMENTED */ | |
589 | return FAIL; | |
590 | } | |
591 | ||
592 | /************************************************* | |
593 | * Diagnostic API * | |
594 | *************************************************/ | |
595 | ||
596 | void | |
597 | auth_heimdal_gssapi_version_report(FILE *f) | |
598 | { | |
599 | /* No build-time constants available unless we link against libraries at | |
600 | build-time and export the result as a string into a header ourselves. */ | |
601 | fprintf(f, "Library version: Heimdal: Runtime: %s\n" | |
602 | " Build Info: %s\n", | |
603 | heimdal_version, heimdal_long_version); | |
604 | } | |
605 | ||
d185889f | 606 | #endif /*!MACRO_PREDEF*/ |
dde3daac PP |
607 | #endif /* AUTH_HEIMDAL_GSSAPI */ |
608 | ||
609 | /* End of heimdal_gssapi.c */ |