Commit | Line | Data |
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dde3daac PP |
1 | /************************************************* |
2 | * Exim - an Internet mail transport agent * | |
3 | *************************************************/ | |
4 | ||
f9ba5e22 | 5 | /* Copyright (c) University of Cambridge 1995 - 2018 */ |
1e1ddfac | 6 | /* Copyright (c) The Exim Maintainers 2020 */ |
dde3daac PP |
7 | /* See the file NOTICE for conditions of use and distribution. */ |
8 | ||
9 | /* Copyright (c) Twitter Inc 2012 | |
10 | Author: Phil Pennock <pdp@exim.org> */ | |
f35771fe | 11 | /* Copyright (c) Phil Pennock 2012 */ |
dde3daac | 12 | |
b245b4a5 | 13 | /* Interface to Heimdal library for GSSAPI authentication. */ |
dde3daac PP |
14 | |
15 | /* Naming and rationale | |
16 | ||
17 | Sensibly, this integration would be deferred to a SASL library, but none | |
18 | of them appear to offer keytab file selection interfaces in their APIs. It | |
19 | might be that this driver only requires minor modification to work with MIT | |
20 | Kerberos. | |
21 | ||
22 | Heimdal provides a number of interfaces for various forms of authentication. | |
23 | As GS2 does not appear to provide keytab control interfaces either, we may | |
24 | end up supporting that too. It's possible that we could trivially expand to | |
25 | support NTLM support via Heimdal, etc. Rather than try to be too generic | |
26 | immediately, this driver is directly only supporting GSSAPI. | |
27 | ||
28 | Without rename, we could add an option for GS2 support in the future. | |
29 | */ | |
30 | ||
31 | /* Sources | |
32 | ||
33 | * mailcheck-imap (Perl, client-side, written by me years ago) | |
34 | * gsasl driver (GPL, server-side) | |
35 | * heimdal sources and man-pages, plus http://www.h5l.org/manual/ | |
36 | * FreeBSD man-pages (very informative!) | |
37 | * http://www.ggf.org/documents/GFD.24.pdf confirming GSS_KRB5_REGISTER_ACCEPTOR_IDENTITY_X | |
b245b4a5 PP |
38 | semantics, that found by browsing Heimdal source to find how to set the keytab; however, |
39 | after multiple attempts I failed to get that to work and instead switched to | |
40 | gsskrb5_register_acceptor_identity(). | |
dde3daac PP |
41 | */ |
42 | ||
43 | #include "../exim.h" | |
44 | ||
45 | #ifndef AUTH_HEIMDAL_GSSAPI | |
46 | /* dummy function to satisfy compilers when we link in an "empty" file. */ | |
e1d15f5e JH |
47 | static void dummy(int x); |
48 | static void dummy2(int x) { dummy(x-1); } | |
49 | static void dummy(int x) { dummy2(x-1); } | |
dde3daac PP |
50 | #else |
51 | ||
52 | #include <gssapi/gssapi.h> | |
53 | #include <gssapi/gssapi_krb5.h> | |
54 | ||
55 | /* for the _init debugging */ | |
56 | #include <krb5.h> | |
57 | ||
dde3daac PP |
58 | #include "heimdal_gssapi.h" |
59 | ||
60 | /* Authenticator-specific options. */ | |
61 | optionlist auth_heimdal_gssapi_options[] = { | |
62 | { "server_hostname", opt_stringptr, | |
13a4b4c1 | 63 | OPT_OFF(auth_heimdal_gssapi_options_block, server_hostname) }, |
dde3daac | 64 | { "server_keytab", opt_stringptr, |
13a4b4c1 | 65 | OPT_OFF(auth_heimdal_gssapi_options_block, server_keytab) }, |
dde3daac | 66 | { "server_service", opt_stringptr, |
13a4b4c1 | 67 | OPT_OFF(auth_heimdal_gssapi_options_block, server_service) } |
dde3daac PP |
68 | }; |
69 | ||
70 | int auth_heimdal_gssapi_options_count = | |
71 | sizeof(auth_heimdal_gssapi_options)/sizeof(optionlist); | |
72 | ||
73 | /* Defaults for the authenticator-specific options. */ | |
74 | auth_heimdal_gssapi_options_block auth_heimdal_gssapi_option_defaults = { | |
75 | US"$primary_hostname", /* server_hostname */ | |
76 | NULL, /* server_keytab */ | |
dde3daac PP |
77 | US"smtp", /* server_service */ |
78 | }; | |
79 | ||
d185889f JH |
80 | |
81 | #ifdef MACRO_PREDEF | |
82 | ||
83 | /* Dummy values */ | |
aab9a843 PP |
84 | void auth_heimdal_gssapi_init(auth_instance *ablock) {} |
85 | int auth_heimdal_gssapi_server(auth_instance *ablock, uschar *data) {return 0;} | |
251b9eb4 JH |
86 | int auth_heimdal_gssapi_client(auth_instance *ablock, void * sx, |
87 | int timeout, uschar *buffer, int buffsize) {return 0;} | |
f9df71c0 | 88 | void auth_heimdal_gssapi_version_report(FILE *f) {} |
d185889f JH |
89 | |
90 | #else /*!MACRO_PREDEF*/ | |
91 | ||
92 | ||
93 | ||
dde3daac PP |
94 | /* "Globals" for managing the heimdal_gssapi interface. */ |
95 | ||
dde3daac PP |
96 | /* Utility functions */ |
97 | static void | |
98 | exim_heimdal_error_debug(const char *, krb5_context, krb5_error_code); | |
99 | static int | |
f3ebb786 | 100 | exim_gssapi_error_defer(rmark, OM_uint32, OM_uint32, const char *, ...) |
dde3daac PP |
101 | PRINTF_FUNCTION(4, 5); |
102 | ||
103 | #define EmptyBuf(buf) do { buf.value = NULL; buf.length = 0; } while (0) | |
104 | ||
105 | ||
106 | /************************************************* | |
107 | * Initialization entry point * | |
108 | *************************************************/ | |
109 | ||
110 | /* Called for each instance, after its options have been read, to | |
111 | enable consistency checks to be done, or anything else that needs | |
112 | to be set up. */ | |
113 | ||
b245b4a5 PP |
114 | /* Heimdal provides a GSSAPI extension method for setting the keytab; |
115 | in the init, we mostly just use raw krb5 methods so that we can report | |
dde3daac PP |
116 | the keytab contents, for -D+auth debugging. */ |
117 | ||
118 | void | |
119 | auth_heimdal_gssapi_init(auth_instance *ablock) | |
120 | { | |
d7978c0f JH |
121 | krb5_context context; |
122 | krb5_keytab keytab; | |
123 | krb5_kt_cursor cursor; | |
124 | krb5_keytab_entry entry; | |
125 | krb5_error_code krc; | |
126 | char *principal, *enctype_s; | |
127 | const char *k_keytab_typed_name = NULL; | |
128 | auth_heimdal_gssapi_options_block *ob = | |
129 | (auth_heimdal_gssapi_options_block *)(ablock->options_block); | |
130 | ||
131 | ablock->server = FALSE; | |
132 | ablock->client = FALSE; | |
133 | ||
134 | if (!ob->server_service || !*ob->server_service) | |
135 | { | |
136 | HDEBUG(D_auth) debug_printf("heimdal: missing server_service\n"); | |
137 | return; | |
870ce70e | 138 | } |
dde3daac | 139 | |
870ce70e | 140 | if ((krc = krb5_init_context(&context))) |
d7978c0f JH |
141 | { |
142 | int kerr = errno; | |
143 | HDEBUG(D_auth) debug_printf("heimdal: failed to initialise krb5 context: %s\n", | |
144 | strerror(kerr)); | |
145 | return; | |
dde3daac PP |
146 | } |
147 | ||
d7978c0f JH |
148 | if (ob->server_keytab) |
149 | { | |
150 | k_keytab_typed_name = CCS string_sprintf("file:%s", expand_string(ob->server_keytab)); | |
151 | HDEBUG(D_auth) debug_printf("heimdal: using keytab %s\n", k_keytab_typed_name); | |
870ce70e | 152 | if ((krc = krb5_kt_resolve(context, k_keytab_typed_name, &keytab))) |
d7978c0f JH |
153 | { |
154 | HDEBUG(D_auth) exim_heimdal_error_debug("krb5_kt_resolve", context, krc); | |
155 | return; | |
dde3daac | 156 | } |
d7978c0f JH |
157 | } |
158 | else | |
159 | { | |
160 | HDEBUG(D_auth) debug_printf("heimdal: using system default keytab\n"); | |
870ce70e | 161 | if ((krc = krb5_kt_default(context, &keytab))) |
d7978c0f JH |
162 | { |
163 | HDEBUG(D_auth) exim_heimdal_error_debug("krb5_kt_default", context, krc); | |
164 | return; | |
dde3daac PP |
165 | } |
166 | } | |
167 | ||
d7978c0f JH |
168 | HDEBUG(D_auth) |
169 | { | |
170 | /* http://www.h5l.org/manual/HEAD/krb5/krb5_keytab_intro.html */ | |
870ce70e | 171 | if ((krc = krb5_kt_start_seq_get(context, keytab, &cursor))) |
d7978c0f JH |
172 | exim_heimdal_error_debug("krb5_kt_start_seq_get", context, krc); |
173 | else | |
174 | { | |
870ce70e | 175 | while (!(krc = krb5_kt_next_entry(context, keytab, &entry, &cursor))) |
d7978c0f JH |
176 | { |
177 | principal = enctype_s = NULL; | |
178 | krb5_unparse_name(context, entry.principal, &principal); | |
179 | krb5_enctype_to_string(context, entry.keyblock.keytype, &enctype_s); | |
180 | debug_printf("heimdal: keytab principal: %s vno=%d type=%s\n", | |
181 | principal ? principal : "??", | |
182 | entry.vno, | |
183 | enctype_s ? enctype_s : "??"); | |
184 | free(principal); | |
185 | free(enctype_s); | |
186 | krb5_kt_free_entry(context, &entry); | |
dde3daac | 187 | } |
870ce70e | 188 | if ((krc = krb5_kt_end_seq_get(context, keytab, &cursor))) |
d7978c0f | 189 | exim_heimdal_error_debug("krb5_kt_end_seq_get", context, krc); |
dde3daac PP |
190 | } |
191 | } | |
192 | ||
870ce70e | 193 | if ((krc = krb5_kt_close(context, keytab))) |
d7978c0f | 194 | HDEBUG(D_auth) exim_heimdal_error_debug("krb5_kt_close", context, krc); |
dde3daac | 195 | |
d7978c0f | 196 | krb5_free_context(context); |
dde3daac | 197 | |
d7978c0f | 198 | ablock->server = TRUE; |
dde3daac PP |
199 | } |
200 | ||
201 | ||
202 | static void | |
203 | exim_heimdal_error_debug(const char *label, | |
204 | krb5_context context, krb5_error_code err) | |
205 | { | |
d7978c0f JH |
206 | const char *kerrsc; |
207 | kerrsc = krb5_get_error_message(context, err); | |
208 | debug_printf("heimdal %s: %s\n", label, kerrsc ? kerrsc : "unknown error"); | |
209 | krb5_free_error_message(context, kerrsc); | |
dde3daac PP |
210 | } |
211 | ||
212 | /************************************************* | |
213 | * Server entry point * | |
214 | *************************************************/ | |
215 | ||
216 | /* For interface, see auths/README */ | |
217 | ||
218 | /* GSSAPI notes: | |
219 | OM_uint32: portable type for unsigned int32 | |
220 | gss_buffer_desc / *gss_buffer_t: hold/point-to size_t .length & void *value | |
221 | -- all strings/etc passed in should go through one of these | |
222 | -- when allocated by gssapi, release with gss_release_buffer() | |
223 | */ | |
224 | ||
225 | int | |
226 | auth_heimdal_gssapi_server(auth_instance *ablock, uschar *initial_data) | |
227 | { | |
d7978c0f JH |
228 | gss_name_t gclient = GSS_C_NO_NAME; |
229 | gss_name_t gserver = GSS_C_NO_NAME; | |
230 | gss_cred_id_t gcred = GSS_C_NO_CREDENTIAL; | |
231 | gss_ctx_id_t gcontext = GSS_C_NO_CONTEXT; | |
232 | uschar *ex_server_str; | |
233 | gss_buffer_desc gbufdesc = GSS_C_EMPTY_BUFFER; | |
234 | gss_buffer_desc gbufdesc_in = GSS_C_EMPTY_BUFFER; | |
235 | gss_buffer_desc gbufdesc_out = GSS_C_EMPTY_BUFFER; | |
236 | gss_OID mech_type; | |
237 | OM_uint32 maj_stat, min_stat; | |
238 | int step, error_out; | |
239 | uschar *tmp1, *tmp2, *from_client; | |
240 | auth_heimdal_gssapi_options_block *ob = | |
241 | (auth_heimdal_gssapi_options_block *)(ablock->options_block); | |
242 | BOOL handled_empty_ir; | |
f3ebb786 | 243 | rmark store_reset_point; |
d7978c0f JH |
244 | uschar *keytab; |
245 | uschar sasl_config[4]; | |
246 | uschar requested_qop; | |
247 | ||
f3ebb786 | 248 | store_reset_point = store_mark(); |
d7978c0f JH |
249 | |
250 | HDEBUG(D_auth) | |
251 | debug_printf("heimdal: initialising auth context for %s\n", ablock->name); | |
252 | ||
253 | /* Construct our gss_name_t gserver describing ourselves */ | |
254 | tmp1 = expand_string(ob->server_service); | |
255 | tmp2 = expand_string(ob->server_hostname); | |
256 | ex_server_str = string_sprintf("%s@%s", tmp1, tmp2); | |
257 | gbufdesc.value = (void *) ex_server_str; | |
258 | gbufdesc.length = Ustrlen(ex_server_str); | |
259 | maj_stat = gss_import_name(&min_stat, | |
260 | &gbufdesc, GSS_C_NT_HOSTBASED_SERVICE, &gserver); | |
261 | if (GSS_ERROR(maj_stat)) | |
262 | return exim_gssapi_error_defer(store_reset_point, maj_stat, min_stat, | |
263 | "gss_import_name(%s)", CS gbufdesc.value); | |
264 | ||
265 | /* Use a specific keytab, if specified */ | |
266 | if (ob->server_keytab) | |
267 | { | |
268 | keytab = expand_string(ob->server_keytab); | |
269 | maj_stat = gsskrb5_register_acceptor_identity(CCS keytab); | |
dde3daac PP |
270 | if (GSS_ERROR(maj_stat)) |
271 | return exim_gssapi_error_defer(store_reset_point, maj_stat, min_stat, | |
d7978c0f JH |
272 | "registering keytab \"%s\"", keytab); |
273 | HDEBUG(D_auth) | |
274 | debug_printf("heimdal: using keytab \"%s\"\n", keytab); | |
dde3daac PP |
275 | } |
276 | ||
d7978c0f JH |
277 | /* Acquire our credentials */ |
278 | maj_stat = gss_acquire_cred(&min_stat, | |
279 | gserver, /* desired name */ | |
280 | 0, /* time */ | |
281 | GSS_C_NULL_OID_SET, /* desired mechs */ | |
282 | GSS_C_ACCEPT, /* cred usage */ | |
283 | &gcred, /* handle */ | |
284 | NULL /* actual mechs */, | |
285 | NULL /* time rec */); | |
286 | if (GSS_ERROR(maj_stat)) | |
287 | return exim_gssapi_error_defer(store_reset_point, maj_stat, min_stat, | |
288 | "gss_acquire_cred(%s)", ex_server_str); | |
289 | ||
290 | maj_stat = gss_release_name(&min_stat, &gserver); | |
291 | ||
292 | HDEBUG(D_auth) debug_printf("heimdal: have server credentials.\n"); | |
293 | ||
294 | /* Loop talking to client */ | |
295 | step = 0; | |
296 | from_client = initial_data; | |
297 | handled_empty_ir = FALSE; | |
298 | error_out = OK; | |
299 | ||
300 | /* buffer sizes: auth_get_data() uses big_buffer, which we grow per | |
301 | GSSAPI RFC in _init, if needed, to meet the SHOULD size of 64KB. | |
302 | (big_buffer starts life at the MUST size of 16KB). */ | |
303 | ||
304 | /* step values | |
305 | 0: getting initial data from client to feed into GSSAPI | |
306 | 1: iterating for as long as GSS_S_CONTINUE_NEEDED | |
307 | 2: GSS_S_COMPLETE, SASL wrapping for authz and qop to send to client | |
308 | 3: unpick final auth message from client | |
309 | 4: break/finish (non-step) | |
310 | */ | |
311 | while (step < 4) | |
312 | switch (step) | |
313 | { | |
314 | case 0: | |
870ce70e | 315 | if (!from_client || !*from_client) |
d7978c0f JH |
316 | { |
317 | if (handled_empty_ir) | |
318 | { | |
319 | HDEBUG(D_auth) debug_printf("gssapi: repeated empty input, grr.\n"); | |
320 | error_out = BAD64; | |
321 | goto ERROR_OUT; | |
322 | } | |
870ce70e JH |
323 | |
324 | HDEBUG(D_auth) debug_printf("gssapi: missing initial response, nudging.\n"); | |
5c329a43 | 325 | if ((error_out = auth_get_data(&from_client, US"", 0)) != OK) |
870ce70e JH |
326 | goto ERROR_OUT; |
327 | handled_empty_ir = TRUE; | |
328 | continue; | |
d7978c0f JH |
329 | } |
330 | /* We should now have the opening data from the client, base64-encoded. */ | |
331 | step += 1; | |
332 | HDEBUG(D_auth) debug_printf("heimdal: have initial client data\n"); | |
333 | break; | |
334 | ||
335 | case 1: | |
336 | gbufdesc_in.length = b64decode(from_client, USS &gbufdesc_in.value); | |
337 | if (gclient) | |
338 | { | |
339 | maj_stat = gss_release_name(&min_stat, &gclient); | |
340 | gclient = GSS_C_NO_NAME; | |
341 | } | |
342 | maj_stat = gss_accept_sec_context(&min_stat, | |
343 | &gcontext, /* context handle */ | |
344 | gcred, /* acceptor cred handle */ | |
345 | &gbufdesc_in, /* input from client */ | |
346 | GSS_C_NO_CHANNEL_BINDINGS, /* XXX fixme: use the channel bindings from GnuTLS */ | |
347 | &gclient, /* client identifier */ | |
348 | &mech_type, /* mechanism in use */ | |
349 | &gbufdesc_out, /* output to send to client */ | |
350 | NULL, /* return flags */ | |
351 | NULL, /* time rec */ | |
352 | NULL /* delegated cred_handle */ | |
353 | ); | |
354 | if (GSS_ERROR(maj_stat)) | |
355 | { | |
356 | exim_gssapi_error_defer(NULL, maj_stat, min_stat, | |
357 | "gss_accept_sec_context()"); | |
358 | error_out = FAIL; | |
359 | goto ERROR_OUT; | |
360 | } | |
361 | if (gbufdesc_out.length != 0) | |
362 | { | |
363 | error_out = auth_get_data(&from_client, | |
364 | gbufdesc_out.value, gbufdesc_out.length); | |
365 | if (error_out != OK) | |
366 | goto ERROR_OUT; | |
367 | ||
368 | gss_release_buffer(&min_stat, &gbufdesc_out); | |
369 | EmptyBuf(gbufdesc_out); | |
370 | } | |
371 | if (maj_stat == GSS_S_COMPLETE) | |
372 | { | |
373 | step += 1; | |
374 | HDEBUG(D_auth) debug_printf("heimdal: GSS complete\n"); | |
375 | } | |
376 | else | |
377 | HDEBUG(D_auth) debug_printf("heimdal: need more data\n"); | |
378 | break; | |
379 | ||
380 | case 2: | |
381 | memset(sasl_config, 0xFF, 4); | |
382 | /* draft-ietf-sasl-gssapi-06.txt defines bitmasks for first octet | |
383 | 0x01 No security layer | |
384 | 0x02 Integrity protection | |
385 | 0x04 Confidentiality protection | |
386 | ||
387 | The remaining three octets are the maximum buffer size for wrapped | |
388 | content. */ | |
389 | sasl_config[0] = 0x01; /* Exim does not wrap/unwrap SASL layers after auth */ | |
390 | gbufdesc.value = (void *) sasl_config; | |
391 | gbufdesc.length = 4; | |
392 | maj_stat = gss_wrap(&min_stat, | |
393 | gcontext, | |
394 | 0, /* conf_req_flag: integrity only */ | |
395 | GSS_C_QOP_DEFAULT, /* qop requested */ | |
396 | &gbufdesc, /* message to protect */ | |
397 | NULL, /* conf_state: no confidentiality applied */ | |
398 | &gbufdesc_out /* output buffer */ | |
399 | ); | |
5031095f | 400 | if (GSS_ERROR(maj_stat)) |
d7978c0f JH |
401 | { |
402 | exim_gssapi_error_defer(NULL, maj_stat, min_stat, | |
403 | "gss_wrap(SASL state after auth)"); | |
404 | error_out = FAIL; | |
405 | goto ERROR_OUT; | |
406 | } | |
407 | ||
408 | HDEBUG(D_auth) debug_printf("heimdal SASL: requesting QOP with no security layers\n"); | |
409 | ||
410 | error_out = auth_get_data(&from_client, | |
411 | gbufdesc_out.value, gbufdesc_out.length); | |
412 | if (error_out != OK) | |
413 | goto ERROR_OUT; | |
414 | ||
415 | gss_release_buffer(&min_stat, &gbufdesc_out); | |
416 | EmptyBuf(gbufdesc_out); | |
417 | step += 1; | |
418 | break; | |
419 | ||
420 | case 3: | |
421 | gbufdesc_in.length = b64decode(from_client, USS &gbufdesc_in.value); | |
422 | maj_stat = gss_unwrap(&min_stat, | |
423 | gcontext, | |
424 | &gbufdesc_in, /* data from client */ | |
425 | &gbufdesc_out, /* results */ | |
426 | NULL, /* conf state */ | |
427 | NULL /* qop state */ | |
428 | ); | |
429 | if (GSS_ERROR(maj_stat)) | |
430 | { | |
431 | exim_gssapi_error_defer(NULL, maj_stat, min_stat, | |
432 | "gss_unwrap(final SASL message from client)"); | |
433 | error_out = FAIL; | |
434 | goto ERROR_OUT; | |
435 | } | |
436 | if (gbufdesc_out.length < 4) | |
437 | { | |
438 | HDEBUG(D_auth) | |
439 | debug_printf("gssapi: final message too short; " | |
440 | "need flags, buf sizes and optional authzid\n"); | |
441 | error_out = FAIL; | |
442 | goto ERROR_OUT; | |
443 | } | |
444 | ||
445 | requested_qop = (CS gbufdesc_out.value)[0]; | |
870ce70e | 446 | if (!(requested_qop & 0x01)) |
d7978c0f JH |
447 | { |
448 | HDEBUG(D_auth) | |
449 | debug_printf("gssapi: client requested security layers (%x)\n", | |
450 | (unsigned int) requested_qop); | |
451 | error_out = FAIL; | |
452 | goto ERROR_OUT; | |
453 | } | |
454 | ||
455 | for (int i = 0; i < AUTH_VARS; i++) auth_vars[i] = NULL; | |
456 | expand_nmax = 0; | |
457 | ||
458 | /* Identifiers: | |
459 | The SASL provided identifier is an unverified authzid. | |
460 | GSSAPI provides us with a verified identifier, but it might be empty | |
461 | for some clients. | |
462 | */ | |
463 | ||
464 | /* $auth2 is authzid requested at SASL layer */ | |
465 | if (gbufdesc_out.length > 4) | |
466 | { | |
467 | expand_nlength[2] = gbufdesc_out.length - 4; | |
468 | auth_vars[1] = expand_nstring[2] = | |
469 | string_copyn((US gbufdesc_out.value) + 4, expand_nlength[2]); | |
470 | expand_nmax = 2; | |
471 | } | |
472 | ||
473 | gss_release_buffer(&min_stat, &gbufdesc_out); | |
474 | EmptyBuf(gbufdesc_out); | |
475 | ||
476 | /* $auth1 is GSSAPI display name */ | |
477 | maj_stat = gss_display_name(&min_stat, | |
870ce70e | 478 | gclient, &gbufdesc_out, &mech_type); |
d7978c0f JH |
479 | if (GSS_ERROR(maj_stat)) |
480 | { | |
481 | auth_vars[1] = expand_nstring[2] = NULL; | |
482 | expand_nmax = 0; | |
483 | exim_gssapi_error_defer(NULL, maj_stat, min_stat, | |
484 | "gss_display_name(client identifier)"); | |
485 | error_out = FAIL; | |
486 | goto ERROR_OUT; | |
487 | } | |
488 | ||
489 | expand_nlength[1] = gbufdesc_out.length; | |
490 | auth_vars[0] = expand_nstring[1] = | |
491 | string_copyn(gbufdesc_out.value, gbufdesc_out.length); | |
492 | ||
493 | if (expand_nmax == 0) /* should be: authzid was empty */ | |
494 | { | |
495 | expand_nmax = 2; | |
496 | expand_nlength[2] = expand_nlength[1]; | |
497 | auth_vars[1] = expand_nstring[2] = string_copyn(expand_nstring[1], expand_nlength[1]); | |
498 | HDEBUG(D_auth) | |
499 | debug_printf("heimdal SASL: empty authzid, set to dup of GSSAPI display name\n"); | |
500 | } | |
501 | ||
502 | HDEBUG(D_auth) | |
503 | debug_printf("heimdal SASL: happy with client request\n" | |
504 | " auth1 (verified GSSAPI display-name): \"%s\"\n" | |
505 | " auth2 (unverified SASL requested authzid): \"%s\"\n", | |
506 | auth_vars[0], auth_vars[1]); | |
507 | ||
508 | step += 1; | |
509 | break; | |
dde3daac PP |
510 | |
511 | } /* switch */ | |
d7978c0f | 512 | /* while step */ |
dde3daac PP |
513 | |
514 | ||
515 | ERROR_OUT: | |
d7978c0f JH |
516 | maj_stat = gss_release_cred(&min_stat, &gcred); |
517 | if (gclient) | |
518 | { | |
519 | gss_release_name(&min_stat, &gclient); | |
520 | gclient = GSS_C_NO_NAME; | |
dde3daac | 521 | } |
d7978c0f JH |
522 | if (gbufdesc_out.length) |
523 | { | |
524 | gss_release_buffer(&min_stat, &gbufdesc_out); | |
525 | EmptyBuf(gbufdesc_out); | |
dde3daac | 526 | } |
d7978c0f JH |
527 | if (gcontext != GSS_C_NO_CONTEXT) |
528 | gss_delete_sec_context(&min_stat, &gcontext, GSS_C_NO_BUFFER); | |
dde3daac | 529 | |
d7978c0f | 530 | store_reset(store_reset_point); |
dde3daac | 531 | |
d7978c0f JH |
532 | if (error_out != OK) |
533 | return error_out; | |
dde3daac | 534 | |
d7978c0f JH |
535 | /* Auth succeeded, check server_condition */ |
536 | return auth_check_serv_cond(ablock); | |
dde3daac PP |
537 | } |
538 | ||
539 | ||
540 | static int | |
f3ebb786 | 541 | exim_gssapi_error_defer(rmark store_reset_point, |
dde3daac PP |
542 | OM_uint32 major, OM_uint32 minor, |
543 | const char *format, ...) | |
544 | { | |
d7978c0f JH |
545 | va_list ap; |
546 | OM_uint32 maj_stat, min_stat; | |
547 | OM_uint32 msgcontext = 0; | |
548 | gss_buffer_desc status_string; | |
549 | gstring * g; | |
550 | ||
551 | HDEBUG(D_auth) | |
552 | { | |
553 | va_start(ap, format); | |
f3ebb786 | 554 | g = string_vformat(NULL, SVFMT_EXTEND|SVFMT_REBUFFER, format, ap); |
d7978c0f JH |
555 | va_end(ap); |
556 | } | |
dde3daac | 557 | |
d7978c0f | 558 | auth_defer_msg = NULL; |
dde3daac | 559 | |
d7978c0f JH |
560 | do { |
561 | maj_stat = gss_display_status(&min_stat, | |
562 | major, GSS_C_GSS_CODE, GSS_C_NO_OID, &msgcontext, &status_string); | |
dde3daac | 563 | |
d7978c0f JH |
564 | if (!auth_defer_msg) |
565 | auth_defer_msg = string_copy(US status_string.value); | |
dde3daac | 566 | |
d7978c0f JH |
567 | HDEBUG(D_auth) debug_printf("heimdal %s: %.*s\n", |
568 | string_from_gstring(g), (int)status_string.length, | |
569 | CS status_string.value); | |
570 | gss_release_buffer(&min_stat, &status_string); | |
dde3daac PP |
571 | |
572 | } while (msgcontext != 0); | |
573 | ||
d7978c0f JH |
574 | if (store_reset_point) |
575 | store_reset(store_reset_point); | |
576 | return DEFER; | |
dde3daac PP |
577 | } |
578 | ||
579 | ||
580 | /************************************************* | |
581 | * Client entry point * | |
582 | *************************************************/ | |
583 | ||
584 | /* For interface, see auths/README */ | |
585 | ||
586 | int | |
587 | auth_heimdal_gssapi_client( | |
588 | auth_instance *ablock, /* authenticator block */ | |
251b9eb4 | 589 | void * sx, /* connection */ |
dde3daac PP |
590 | int timeout, /* command timeout */ |
591 | uschar *buffer, /* buffer for reading response */ | |
592 | int buffsize) /* size of buffer */ | |
593 | { | |
d7978c0f JH |
594 | HDEBUG(D_auth) |
595 | debug_printf("Client side NOT IMPLEMENTED: you should not see this!\n"); | |
596 | /* NOT IMPLEMENTED */ | |
597 | return FAIL; | |
dde3daac PP |
598 | } |
599 | ||
600 | /************************************************* | |
601 | * Diagnostic API * | |
602 | *************************************************/ | |
603 | ||
604 | void | |
605 | auth_heimdal_gssapi_version_report(FILE *f) | |
606 | { | |
d7978c0f JH |
607 | /* No build-time constants available unless we link against libraries at |
608 | build-time and export the result as a string into a header ourselves. */ | |
609 | fprintf(f, "Library version: Heimdal: Runtime: %s\n" | |
610 | " Build Info: %s\n", | |
611 | heimdal_version, heimdal_long_version); | |
dde3daac PP |
612 | } |
613 | ||
d185889f | 614 | #endif /*!MACRO_PREDEF*/ |
dde3daac PP |
615 | #endif /* AUTH_HEIMDAL_GSSAPI */ |
616 | ||
617 | /* End of heimdal_gssapi.c */ |