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b9a54c29 | 1 | /* |
ff2d7a98 | 2 | * Copyright (c) 2001,2002 Simon Wilkinson. All rights reserved. * |
b9a54c29 | 3 | * Redistribution and use in source and binary forms, with or without |
4 | * modification, are permitted provided that the following conditions | |
5 | * are met: | |
6 | * 1. Redistributions of source code must retain the above copyright | |
7 | * notice, this list of conditions and the following disclaimer. | |
8 | * 2. Redistributions in binary form must reproduce the above copyright | |
9 | * notice, this list of conditions and the following disclaimer in the | |
10 | * documentation and/or other materials provided with the distribution. | |
11 | * | |
12 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR `AS IS'' AND ANY EXPRESS OR | |
13 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES | |
14 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. | |
15 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, | |
16 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT | |
17 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, | |
18 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY | |
19 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | |
20 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF | |
21 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
22 | */ | |
23 | ||
24 | #include "includes.h" | |
25 | ||
26 | #ifdef GSSAPI | |
27 | ||
28 | #include "ssh.h" | |
29 | #include "ssh2.h" | |
30 | #include "xmalloc.h" | |
31 | #include "buffer.h" | |
32 | #include "bufaux.h" | |
33 | #include "packet.h" | |
34 | #include "compat.h" | |
35 | #include <openssl/evp.h> | |
36 | #include "cipher.h" | |
37 | #include "kex.h" | |
38 | #include "log.h" | |
39 | #include "compat.h" | |
ff2d7a98 | 40 | #include "monitor_wrap.h" |
c2397a66 | 41 | #include "canohost.h" |
b9a54c29 | 42 | |
43 | #include <netdb.h> | |
44 | ||
45 | #include "ssh-gss.h" | |
46 | ||
47 | /* Assorted globals for tracking the clients identity once they've | |
48 | * authenticated */ | |
49 | ||
50 | gss_buffer_desc gssapi_client_name = {0,NULL}; /* Name of our client */ | |
51 | gss_cred_id_t gssapi_client_creds = GSS_C_NO_CREDENTIAL; /* Their credentials */ | |
52 | enum ssh_gss_id gssapi_client_type = GSS_LAST_ENTRY; | |
53 | ||
ff2d7a98 | 54 | unsigned char ssh1_key_digest[16]; /* used for ssh1 gssapi */ |
55 | ||
b9a54c29 | 56 | /* The mechanism name used in the list below is defined in the internet |
57 | * draft as the Base 64 encoding of the MD5 hash of the ASN.1 DER encoding | |
58 | * of the underlying GSSAPI mechanism's OID. | |
59 | * | |
60 | * Also from the draft, before considering adding SPNEGO, bear in mind that | |
61 | * "mechanisms ... MUST NOT use SPNEGO as the underlying GSSAPI mechanism" | |
62 | */ | |
63 | ||
64 | /* These must be in the same order as ssh_gss_id, in ssh-gss.h */ | |
65 | ||
66 | ssh_gssapi_mech supported_mechs[]= { | |
67 | #ifdef KRB5 | |
68 | /* Official OID - 1.2.850.113554.1.2.2 */ | |
69 | {"Se3H81ismmOC3OE+FwYCiQ==","Kerberos", | |
70 | {9, "\x2A\x86\x48\x86\xF7\x12\x01\x02\x02"}}, | |
71 | #endif | |
72 | #ifdef GSI | |
73 | /* gssapi_ssleay 1.3.6.1.4.1.3536.1.1 */ | |
74 | {"N3+k7/4wGxHyuP8Yxi4RhA==", | |
75 | "GSI", | |
76 | {9, "\x2B\x06\x01\x04\x01\x9B\x50\x01\x01"} | |
77 | }, | |
78 | #endif /* GSI */ | |
79 | {NULL,NULL,{0,0}} | |
80 | }; | |
81 | ||
82 | char gssprefix[]=KEX_GSS_SHA1; | |
83 | ||
84 | /* Return a list of the gss-group1-sha1-x mechanisms supported by this | |
85 | * program. | |
86 | * | |
87 | * We only support the mechanisms that we've indicated in the list above, | |
88 | * but we check that they're supported by the GSSAPI mechanism on the | |
89 | * machine. We also check, before including them in the list, that | |
90 | * we have the necesary information in order to carry out the key exchange | |
91 | * (that is, that the user has credentials, the server's creds are accessible, | |
92 | * etc) | |
93 | * | |
94 | * The way that this is done is fairly nasty, as we do a lot of work that | |
95 | * is then thrown away. This should possibly be implemented with a cache | |
96 | * that stores the results (in an expanded Gssctxt structure), which are | |
97 | * then used by the first calls if that key exchange mechanism is chosen. | |
98 | */ | |
99 | ||
100 | char * | |
101 | ssh_gssapi_mechanisms(int server,char *host) { | |
102 | gss_OID_set supported; | |
103 | OM_uint32 maj_status, min_status; | |
104 | Buffer buf; | |
105 | int i = 0; | |
106 | int present; | |
c2397a66 | 107 | int mech_count=0; |
b9a54c29 | 108 | char * mechs; |
ff2d7a98 | 109 | Gssctxt * ctx = NULL; |
b9a54c29 | 110 | |
111 | if (datafellows & SSH_OLD_GSSAPI) return NULL; | |
112 | ||
98f19977 | 113 | PRIVSEP(gss_indicate_mechs(&min_status, &supported)); |
b9a54c29 | 114 | |
115 | buffer_init(&buf); | |
116 | ||
117 | do { | |
118 | if ((maj_status=gss_test_oid_set_member(&min_status, | |
119 | &supported_mechs[i].oid, | |
120 | supported, | |
121 | &present))) { | |
122 | present=0; | |
123 | } | |
124 | if (present) { | |
ff2d7a98 | 125 | if ((server && |
126 | !GSS_ERROR(PRIVSEP(ssh_gssapi_server_ctx(&ctx, | |
127 | &supported_mechs[i].oid)))) | |
128 | || (!server && | |
129 | !GSS_ERROR(ssh_gssapi_client_ctx(&ctx, | |
130 | &supported_mechs[i].oid, | |
131 | host)))) { | |
132 | /* Append gss_group1_sha1_x to our list */ | |
c2397a66 | 133 | if (++mech_count > 1) { |
134 | buffer_append(&buf, ",", 1); | |
135 | } | |
ff2d7a98 | 136 | buffer_append(&buf, gssprefix, |
137 | strlen(gssprefix)); | |
138 | buffer_append(&buf, | |
139 | supported_mechs[i].enc_name, | |
140 | strlen(supported_mechs[i].enc_name)); | |
c2397a66 | 141 | debug("GSSAPI mechanism %s (%s%s) supported", |
142 | supported_mechs[i].name, gssprefix, | |
143 | supported_mechs[i].enc_name); | |
144 | } else { | |
145 | debug("no credentials for GSSAPI mechanism %s", | |
146 | supported_mechs[i].name); | |
147 | } | |
148 | } else { | |
149 | debug("GSSAPI mechanism %s not supported", | |
150 | supported_mechs[i].name); | |
151 | } | |
b9a54c29 | 152 | } while (supported_mechs[++i].name != NULL); |
153 | ||
154 | buffer_put_char(&buf,'\0'); | |
155 | ||
156 | mechs=xmalloc(buffer_len(&buf)); | |
157 | buffer_get(&buf,mechs,buffer_len(&buf)); | |
158 | buffer_free(&buf); | |
159 | if (strlen(mechs)==0) | |
160 | return(NULL); | |
161 | else | |
162 | return(mechs); | |
163 | } | |
164 | ||
165 | void ssh_gssapi_supported_oids(gss_OID_set *oidset) { | |
166 | enum ssh_gss_id i =0; | |
167 | OM_uint32 maj_status,min_status; | |
168 | int present; | |
169 | gss_OID_set supported; | |
170 | ||
171 | gss_create_empty_oid_set(&min_status,oidset); | |
98f19977 | 172 | PRIVSEP(gss_indicate_mechs(&min_status, &supported)); |
b9a54c29 | 173 | |
174 | while (supported_mechs[i].name!=NULL) { | |
175 | if ((maj_status=gss_test_oid_set_member(&min_status, | |
176 | &supported_mechs[i].oid, | |
177 | supported, | |
178 | &present))) { | |
179 | present=0; | |
180 | } | |
181 | if (present) { | |
182 | gss_add_oid_set_member(&min_status, | |
183 | &supported_mechs[i].oid, | |
184 | oidset); | |
185 | } | |
186 | i++; | |
187 | } | |
188 | } | |
189 | ||
190 | /* Set the contexts OID from a data stream */ | |
191 | void ssh_gssapi_set_oid_data(Gssctxt *ctx, void *data, size_t len) { | |
192 | if (ctx->oid != GSS_C_NO_OID) { | |
193 | xfree(ctx->oid->elements); | |
194 | xfree(ctx->oid); | |
195 | } | |
196 | ctx->oid=xmalloc(sizeof(gss_OID_desc)); | |
197 | ctx->oid->length=len; | |
198 | ctx->oid->elements=xmalloc(len); | |
199 | memcpy(ctx->oid->elements,data,len); | |
200 | } | |
201 | ||
202 | /* Set the contexts OID */ | |
203 | void ssh_gssapi_set_oid(Gssctxt *ctx, gss_OID oid) { | |
204 | ssh_gssapi_set_oid_data(ctx,oid->elements,oid->length); | |
205 | } | |
206 | ||
207 | /* Find out which GSS type (out of the list we define in ssh-gss.h) a | |
208 | * particular connection is using | |
209 | */ | |
210 | enum ssh_gss_id ssh_gssapi_get_ctype(Gssctxt *ctxt) { | |
211 | enum ssh_gss_id i=0; | |
212 | ||
c2397a66 | 213 | while(supported_mechs[i].name!=NULL) { |
214 | if (supported_mechs[i].oid.length == ctxt->oid->length && | |
215 | (memcmp(supported_mechs[i].oid.elements, | |
216 | ctxt->oid->elements,ctxt->oid->length) == 0)) | |
217 | return i; | |
b9a54c29 | 218 | i++; |
219 | } | |
c2397a66 | 220 | return(GSS_LAST_ENTRY); |
b9a54c29 | 221 | } |
222 | ||
223 | /* Set the GSS context's OID to the oid indicated by the given key exchange | |
224 | * name. */ | |
ff2d7a98 | 225 | gss_OID ssh_gssapi_id_kex(Gssctxt *ctx, char *name) { |
b9a54c29 | 226 | enum ssh_gss_id i=0; |
227 | ||
228 | if (strncmp(name, gssprefix, strlen(gssprefix)-1) !=0) { | |
ff2d7a98 | 229 | return(NULL); |
b9a54c29 | 230 | } |
231 | ||
232 | name+=strlen(gssprefix); /* Move to the start of the MIME string */ | |
233 | ||
234 | while (supported_mechs[i].name!=NULL && | |
235 | strcmp(name,supported_mechs[i].enc_name)!=0) { | |
236 | i++; | |
237 | } | |
238 | ||
239 | if (supported_mechs[i].name==NULL) | |
ff2d7a98 | 240 | return (NULL); |
b9a54c29 | 241 | |
ff2d7a98 | 242 | if (ctx) ssh_gssapi_set_oid(ctx,&supported_mechs[i].oid); |
b9a54c29 | 243 | |
c2397a66 | 244 | debug("using GSSAPI mechanism %s (%s%s)", supported_mechs[i].name, |
245 | gssprefix, supported_mechs[i].enc_name); | |
246 | ||
ff2d7a98 | 247 | return &supported_mechs[i].oid; |
b9a54c29 | 248 | } |
249 | ||
250 | ||
251 | /* All this effort to report an error ... */ | |
078f71c2 | 252 | static void |
67e2750c | 253 | ssh_gssapi_error_ex(gss_OID mech, OM_uint32 major_status, |
254 | OM_uint32 minor_status, | |
078f71c2 | 255 | int send_packet) { |
b9a54c29 | 256 | OM_uint32 lmaj, lmin; |
c2397a66 | 257 | gss_buffer_desc msg = {0,NULL}; |
b9a54c29 | 258 | OM_uint32 ctx; |
259 | ||
260 | ctx = 0; | |
261 | /* The GSSAPI error */ | |
262 | do { | |
98f19977 | 263 | lmaj = PRIVSEP(gss_display_status(&lmin, major_status, |
264 | GSS_C_GSS_CODE, | |
265 | mech, | |
266 | &ctx, &msg)); | |
b9a54c29 | 267 | if (lmaj == GSS_S_COMPLETE) { |
268 | debug((char *)msg.value); | |
078f71c2 | 269 | if (send_packet) packet_send_debug((char *)msg.value); |
b9a54c29 | 270 | (void) gss_release_buffer(&lmin, &msg); |
271 | } | |
272 | } while (ctx!=0); | |
273 | ||
274 | /* The mechanism specific error */ | |
275 | do { | |
98f19977 | 276 | lmaj = PRIVSEP(gss_display_status(&lmin, minor_status, |
277 | GSS_C_MECH_CODE, | |
278 | mech, | |
279 | &ctx, &msg)); | |
b9a54c29 | 280 | if (lmaj == GSS_S_COMPLETE) { |
281 | debug((char *)msg.value); | |
078f71c2 | 282 | if (send_packet) packet_send_debug((char *)msg.value); |
b9a54c29 | 283 | (void) gss_release_buffer(&lmin, &msg); |
284 | } | |
285 | } while (ctx!=0); | |
286 | } | |
287 | ||
078f71c2 | 288 | void |
67e2750c | 289 | ssh_gssapi_error(gss_OID mech,OM_uint32 major_status,OM_uint32 minor_status) { |
290 | ssh_gssapi_error_ex(mech, major_status, minor_status, 0); | |
078f71c2 | 291 | } |
292 | ||
293 | void | |
67e2750c | 294 | ssh_gssapi_send_error(gss_OID mech, |
295 | OM_uint32 major_status,OM_uint32 minor_status) { | |
296 | ssh_gssapi_error_ex(mech, major_status, minor_status, 1); | |
078f71c2 | 297 | } |
298 | ||
299 | ||
300 | ||
301 | ||
b9a54c29 | 302 | /* Initialise our GSSAPI context. We use this opaque structure to contain all |
303 | * of the data which both the client and server need to persist across | |
304 | * {accept,init}_sec_context calls, so that when we do it from the userauth | |
305 | * stuff life is a little easier | |
306 | */ | |
307 | void | |
ff2d7a98 | 308 | ssh_gssapi_build_ctx(Gssctxt **ctx) |
b9a54c29 | 309 | { |
ff2d7a98 | 310 | *ctx=xmalloc(sizeof (Gssctxt)); |
311 | (*ctx)->context=GSS_C_NO_CONTEXT; | |
312 | (*ctx)->name=GSS_C_NO_NAME; | |
313 | (*ctx)->oid=GSS_C_NO_OID; | |
314 | (*ctx)->creds=GSS_C_NO_CREDENTIAL; | |
315 | (*ctx)->client=GSS_C_NO_NAME; | |
316 | (*ctx)->client_creds=GSS_C_NO_CREDENTIAL; | |
b9a54c29 | 317 | } |
318 | ||
319 | /* Delete our context, providing it has been built correctly */ | |
320 | void | |
ff2d7a98 | 321 | ssh_gssapi_delete_ctx(Gssctxt **ctx) |
b9a54c29 | 322 | { |
98f19977 | 323 | #if !defined(MECHGLUE) |
b9a54c29 | 324 | OM_uint32 ms; |
98f19977 | 325 | #endif |
b9a54c29 | 326 | |
ff2d7a98 | 327 | /* Return if there's no context */ |
328 | if ((*ctx)==NULL) | |
329 | return; | |
330 | ||
c2397a66 | 331 | #if !defined(MECHGLUE) /* mechglue has some memory management issues */ |
ff2d7a98 | 332 | if ((*ctx)->context != GSS_C_NO_CONTEXT) |
333 | gss_delete_sec_context(&ms,&(*ctx)->context,GSS_C_NO_BUFFER); | |
334 | if ((*ctx)->name != GSS_C_NO_NAME) | |
335 | gss_release_name(&ms,&(*ctx)->name); | |
336 | if ((*ctx)->oid != GSS_C_NO_OID) { | |
337 | xfree((*ctx)->oid->elements); | |
338 | xfree((*ctx)->oid); | |
339 | (*ctx)->oid = GSS_C_NO_OID; | |
b9a54c29 | 340 | } |
ff2d7a98 | 341 | if ((*ctx)->creds != GSS_C_NO_CREDENTIAL) |
342 | gss_release_cred(&ms,&(*ctx)->creds); | |
343 | if ((*ctx)->client != GSS_C_NO_NAME) | |
344 | gss_release_name(&ms,&(*ctx)->client); | |
345 | if ((*ctx)->client_creds != GSS_C_NO_CREDENTIAL) | |
346 | gss_release_cred(&ms,&(*ctx)->client_creds); | |
c2397a66 | 347 | #endif |
ff2d7a98 | 348 | |
349 | xfree(*ctx); | |
350 | *ctx=NULL; | |
b9a54c29 | 351 | } |
352 | ||
353 | /* Wrapper to init_sec_context | |
354 | * Requires that the context contains: | |
355 | * oid | |
356 | * server name (from ssh_gssapi_import_name) | |
357 | */ | |
358 | OM_uint32 | |
359 | ssh_gssapi_init_ctx(Gssctxt *ctx, int deleg_creds, gss_buffer_desc *recv_tok, | |
360 | gss_buffer_desc* send_tok, OM_uint32 *flags) | |
361 | { | |
362 | OM_uint32 maj_status, min_status; | |
363 | int deleg_flag = 0; | |
364 | ||
365 | if (deleg_creds) { | |
366 | deleg_flag=GSS_C_DELEG_FLAG; | |
367 | debug("Delegating credentials"); | |
368 | } | |
369 | ||
370 | maj_status=gss_init_sec_context(&min_status, | |
371 | GSS_C_NO_CREDENTIAL, /* def. cred */ | |
372 | &ctx->context, | |
373 | ctx->name, | |
374 | ctx->oid, | |
375 | GSS_C_MUTUAL_FLAG | | |
376 | GSS_C_INTEG_FLAG | | |
377 | deleg_flag, | |
378 | 0, /* default lifetime */ | |
379 | NULL, /* no channel bindings */ | |
380 | recv_tok, | |
381 | NULL, | |
382 | send_tok, | |
383 | flags, | |
384 | NULL); | |
385 | ctx->status=maj_status; | |
386 | if (GSS_ERROR(maj_status)) { | |
67e2750c | 387 | ssh_gssapi_error(ctx->oid,maj_status,min_status); |
b9a54c29 | 388 | } |
389 | return(maj_status); | |
390 | } | |
391 | ||
392 | /* Wrapper arround accept_sec_context | |
393 | * Requires that the context contains: | |
394 | * oid | |
395 | * credentials (from ssh_gssapi_acquire_cred) | |
396 | */ | |
397 | OM_uint32 ssh_gssapi_accept_ctx(Gssctxt *ctx,gss_buffer_desc *recv_tok, | |
398 | gss_buffer_desc *send_tok, OM_uint32 *flags) | |
399 | { | |
400 | OM_uint32 maj_status, min_status; | |
98f19977 | 401 | gss_OID mech; |
b9a54c29 | 402 | |
403 | maj_status=gss_accept_sec_context(&min_status, | |
404 | &ctx->context, | |
405 | ctx->creds, | |
406 | recv_tok, | |
407 | GSS_C_NO_CHANNEL_BINDINGS, | |
408 | &ctx->client, | |
98f19977 | 409 | &mech, /* read-only pointer */ |
b9a54c29 | 410 | send_tok, |
411 | flags, | |
412 | NULL, | |
413 | &ctx->client_creds); | |
414 | if (GSS_ERROR(maj_status)) { | |
67e2750c | 415 | ssh_gssapi_send_error(ctx->oid,maj_status,min_status); |
b9a54c29 | 416 | } |
417 | ||
418 | if (ctx->client_creds) { | |
419 | debug("Received some client credentials"); | |
420 | } else { | |
421 | debug("Got no client credentials"); | |
422 | } | |
423 | ||
ff2d7a98 | 424 | /* FIXME: We should check that the me |
b9a54c29 | 425 | * the one that we asked for (in ctx->oid) */ |
426 | ||
427 | ctx->status=maj_status; | |
428 | ||
ff2d7a98 | 429 | /* Now, if we're complete and we have the right flags, then |
430 | * we flag the user as also having been authenticated | |
431 | */ | |
432 | ||
433 | if (((flags==NULL) || ((*flags & GSS_C_MUTUAL_FLAG) && | |
434 | (*flags & GSS_C_INTEG_FLAG))) && | |
435 | (maj_status == GSS_S_COMPLETE)) { | |
436 | if (ssh_gssapi_getclient(ctx,&gssapi_client_type, | |
437 | &gssapi_client_name, | |
438 | &gssapi_client_creds)) | |
439 | fatal("Couldn't convert client name"); | |
440 | } | |
441 | ||
b9a54c29 | 442 | return(maj_status); |
443 | } | |
444 | ||
445 | /* Create a service name for the given host */ | |
446 | OM_uint32 | |
447 | ssh_gssapi_import_name(Gssctxt *ctx, const char *host) { | |
c2397a66 | 448 | gss_buffer_desc gssbuf = {0,NULL}; |
b9a54c29 | 449 | OM_uint32 maj_status, min_status; |
b9a54c29 | 450 | char *xhost; |
451 | ||
452 | /* Make a copy of the host name, in case it was returned by a | |
453 | * previous call to gethostbyname(). */ | |
454 | xhost = xstrdup(host); | |
455 | ||
c2397a66 | 456 | /* If xhost is the loopback interface, switch it to our |
457 | true local hostname. */ | |
458 | resolve_localhost(&xhost); | |
459 | ||
460 | /* Make sure we have the FQHN. Some GSSAPI implementations don't do | |
b9a54c29 | 461 | * this for us themselves */ |
c2397a66 | 462 | make_fqhn(&xhost); |
463 | ||
b9a54c29 | 464 | gssbuf.length = sizeof("host@")+strlen(xhost); |
465 | ||
466 | gssbuf.value = xmalloc(gssbuf.length); | |
467 | if (gssbuf.value == NULL) { | |
468 | xfree(xhost); | |
469 | return(-1); | |
470 | } | |
471 | snprintf(gssbuf.value,gssbuf.length,"host@%s",xhost); | |
472 | if ((maj_status=gss_import_name(&min_status, | |
473 | &gssbuf, | |
474 | GSS_C_NT_HOSTBASED_SERVICE, | |
475 | &ctx->name))) { | |
67e2750c | 476 | ssh_gssapi_error(ctx->oid, maj_status,min_status); |
b9a54c29 | 477 | } |
478 | ||
479 | xfree(xhost); | |
480 | xfree(gssbuf.value); | |
481 | return(maj_status); | |
482 | } | |
483 | ||
484 | /* Acquire credentials for a server running on the current host. | |
485 | * Requires that the context structure contains a valid OID | |
ff2d7a98 | 486 | */ |
487 | ||
488 | /* Returns a GSSAPI error code */ | |
b9a54c29 | 489 | OM_uint32 |
490 | ssh_gssapi_acquire_cred(Gssctxt *ctx) { | |
491 | OM_uint32 maj_status, min_status; | |
492 | char lname[MAXHOSTNAMELEN]; | |
493 | gss_OID_set oidset; | |
494 | ||
495 | gss_create_empty_oid_set(&min_status,&oidset); | |
496 | gss_add_oid_set_member(&min_status,ctx->oid,&oidset); | |
497 | ||
498 | if (gethostname(lname, MAXHOSTNAMELEN)) { | |
499 | return(-1); | |
500 | } | |
501 | ||
502 | if ((maj_status=ssh_gssapi_import_name(ctx,lname))) { | |
503 | return(maj_status); | |
504 | } | |
505 | if ((maj_status=gss_acquire_cred(&min_status, | |
506 | ctx->name, | |
507 | 0, | |
508 | oidset, | |
509 | GSS_C_ACCEPT, | |
510 | &ctx->creds, | |
511 | NULL, | |
512 | NULL))) { | |
98f19977 | 513 | ssh_gssapi_error(ctx->oid,maj_status,min_status); |
b9a54c29 | 514 | } |
515 | ||
516 | gss_release_oid_set(&min_status, &oidset); | |
517 | return(maj_status); | |
518 | } | |
519 | ||
520 | /* Extract the client details from a given context. This can only reliably | |
521 | * be called once for a context */ | |
522 | ||
523 | OM_uint32 | |
524 | ssh_gssapi_getclient(Gssctxt *ctx, enum ssh_gss_id *type, | |
525 | gss_buffer_desc *name, gss_cred_id_t *creds) { | |
526 | ||
527 | OM_uint32 maj_status,min_status; | |
528 | ||
529 | *type=ssh_gssapi_get_ctype(ctx); | |
530 | if ((maj_status=gss_display_name(&min_status,ctx->client,name,NULL))) { | |
98f19977 | 531 | ssh_gssapi_error(ctx->oid,maj_status,min_status); |
b9a54c29 | 532 | } |
533 | ||
534 | /* This is icky. There appears to be no way to copy this structure, | |
535 | * rather than the pointer to it, so we simply copy the pointer and | |
536 | * mark the originator as empty so we don't destroy it. | |
537 | */ | |
538 | *creds=ctx->client_creds; | |
539 | ctx->client_creds=GSS_C_NO_CREDENTIAL; | |
540 | return(maj_status); | |
541 | } | |
ff2d7a98 | 542 | |
543 | OM_uint32 | |
544 | ssh_gssapi_sign(Gssctxt *ctx, gss_buffer_desc *buffer, gss_buffer_desc *hash) { | |
545 | OM_uint32 maj_status,min_status; | |
b9a54c29 | 546 | |
ff2d7a98 | 547 | /* ssh1 needs to exchange the hash of the keys */ |
548 | /* will us this hash to return it */ | |
549 | if (!compat20) { | |
550 | if ((maj_status=gss_wrap(&min_status,ctx->context, | |
551 | 0, | |
552 | GSS_C_QOP_DEFAULT, | |
553 | buffer, | |
554 | NULL, | |
555 | hash))) | |
67e2750c | 556 | ssh_gssapi_error(ctx->oid,maj_status,min_status); |
ff2d7a98 | 557 | } |
558 | else | |
559 | ||
560 | if ((maj_status=gss_get_mic(&min_status,ctx->context, | |
561 | GSS_C_QOP_DEFAULT, buffer, hash))) { | |
67e2750c | 562 | ssh_gssapi_error(ctx->oid,maj_status,min_status); |
ff2d7a98 | 563 | } |
564 | ||
565 | return(maj_status); | |
566 | } | |
567 | ||
568 | OM_uint32 | |
569 | ssh_gssapi_server_ctx(Gssctxt **ctx,gss_OID oid) { | |
570 | if (*ctx) ssh_gssapi_delete_ctx(ctx); | |
571 | ssh_gssapi_build_ctx(ctx); | |
572 | ssh_gssapi_set_oid(*ctx,oid); | |
573 | return(ssh_gssapi_acquire_cred(*ctx)); | |
574 | } | |
575 | ||
576 | OM_uint32 | |
577 | ssh_gssapi_client_ctx(Gssctxt **ctx,gss_OID oid, char *host) { | |
c2397a66 | 578 | gss_buffer_desc token = {0,NULL}; |
ff2d7a98 | 579 | OM_uint32 major,minor; |
580 | ||
581 | if (*ctx) ssh_gssapi_delete_ctx(ctx); | |
582 | ssh_gssapi_build_ctx(ctx); | |
583 | ssh_gssapi_set_oid(*ctx,oid); | |
584 | ssh_gssapi_import_name(*ctx,host); | |
585 | major=ssh_gssapi_init_ctx(*ctx, 0, GSS_C_NO_BUFFER, &token, NULL); | |
586 | gss_release_buffer(&minor,&token); | |
587 | return(major); | |
588 | } | |
589 | ||
b9a54c29 | 590 | #endif /* GSSAPI */ |