]>
Commit | Line | Data |
---|---|---|
5156b1a1 | 1 | /* $OpenBSD: gss-serv.c,v 1.22 2008/05/08 12:02:23 djm Exp $ */ |
7cac2b65 | 2 | |
5598e598 | 3 | /* |
f97edba6 | 4 | * Copyright (c) 2001-2009 Simon Wilkinson. All rights reserved. |
5598e598 | 5 | * |
6 | * Redistribution and use in source and binary forms, with or without | |
7 | * modification, are permitted provided that the following conditions | |
8 | * are met: | |
9 | * 1. Redistributions of source code must retain the above copyright | |
10 | * notice, this list of conditions and the following disclaimer. | |
11 | * 2. Redistributions in binary form must reproduce the above copyright | |
12 | * notice, this list of conditions and the following disclaimer in the | |
13 | * documentation and/or other materials provided with the distribution. | |
14 | * | |
15 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR `AS IS'' AND ANY EXPRESS OR | |
16 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES | |
17 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. | |
18 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, | |
19 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT | |
20 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, | |
21 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY | |
22 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | |
23 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF | |
24 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
25 | */ | |
26 | ||
27 | #include "includes.h" | |
28 | ||
29 | #ifdef GSSAPI | |
30 | ||
30460aeb | 31 | #include <sys/types.h> |
fa0f0f45 | 32 | #include <sys/param.h> |
30460aeb | 33 | |
34 | #include <stdarg.h> | |
35 | #include <string.h> | |
36 | #include <unistd.h> | |
37 | ||
5156b1a1 | 38 | #include "openbsd-compat/sys-queue.h" |
30460aeb | 39 | #include "xmalloc.h" |
40 | #include "buffer.h" | |
41 | #include "key.h" | |
42 | #include "hostfile.h" | |
5598e598 | 43 | #include "auth.h" |
44 | #include "log.h" | |
e5affddc | 45 | #include "channels.h" |
5598e598 | 46 | #include "session.h" |
f713db99 | 47 | #include "misc.h" |
5598e598 | 48 | #include "servconf.h" |
f97edba6 | 49 | #include "uidswap.h" |
f713db99 | 50 | |
7cac2b65 | 51 | #include "xmalloc.h" |
5598e598 | 52 | #include "ssh-gss.h" |
30460aeb | 53 | #include "monitor_wrap.h" |
5598e598 | 54 | |
bd3336ab | 55 | extern ServerOptions options; |
ae82558b | 56 | extern Authctxt *the_authctxt; |
bd3336ab | 57 | |
23987cb8 | 58 | static ssh_gssapi_client gssapi_client = |
7cac2b65 | 59 | { GSS_C_EMPTY_BUFFER, GSS_C_EMPTY_BUFFER, |
f97edba6 | 60 | GSS_C_NO_CREDENTIAL, GSS_C_NO_NAME, NULL, {NULL, NULL, NULL}, 0, 0}; |
5598e598 | 61 | |
7cac2b65 | 62 | ssh_gssapi_mech gssapi_null_mech = |
f97edba6 | 63 | { NULL, NULL, {0, NULL}, NULL, NULL, NULL, NULL, NULL}; |
44a053a3 | 64 | |
5598e598 | 65 | #ifdef KRB5 |
23987cb8 | 66 | extern ssh_gssapi_mech gssapi_kerberos_mech; |
54425c7a | 67 | #endif |
5598e598 | 68 | #ifdef GSI |
23987cb8 | 69 | extern ssh_gssapi_mech gssapi_gsi_mech; |
b311f64e | 70 | #endif |
71 | ||
23987cb8 | 72 | ssh_gssapi_mech* supported_mechs[]= { |
5598e598 | 73 | #ifdef KRB5 |
7cac2b65 | 74 | &gssapi_kerberos_mech, |
5598e598 | 75 | #endif |
76 | #ifdef GSI | |
7cac2b65 | 77 | &gssapi_gsi_mech, |
7b5a625b | 78 | #endif |
7cac2b65 | 79 | &gssapi_null_mech, |
23987cb8 | 80 | }; |
5598e598 | 81 | |
b4cfa386 | 82 | #ifdef GSS_C_GLOBUS_LIMITED_PROXY_FLAG |
83 | static int limited = 0; | |
84 | #endif | |
85 | ||
fa0f0f45 | 86 | /* |
87 | * Acquire credentials for a server running on the current host. | |
f713db99 | 88 | * Requires that the context structure contains a valid OID |
89 | */ | |
90 | ||
91 | /* Returns a GSSAPI error code */ | |
fa0f0f45 | 92 | /* Privileged (called from ssh_gssapi_server_ctx) */ |
93 | static OM_uint32 | |
f713db99 | 94 | ssh_gssapi_acquire_cred(Gssctxt *ctx) |
95 | { | |
96 | OM_uint32 status; | |
97 | char lname[MAXHOSTNAMELEN]; | |
98 | gss_OID_set oidset; | |
99 | ||
100 | if (options.gss_strict_acceptor) { | |
101 | gss_create_empty_oid_set(&status, &oidset); | |
102 | gss_add_oid_set_member(&status, ctx->oid, &oidset); | |
103 | ||
104 | if (gethostname(lname, MAXHOSTNAMELEN)) { | |
105 | gss_release_oid_set(&status, &oidset); | |
106 | return (-1); | |
107 | } | |
108 | ||
109 | if (GSS_ERROR(ssh_gssapi_import_name(ctx, lname))) { | |
110 | gss_release_oid_set(&status, &oidset); | |
111 | return (ctx->major); | |
112 | } | |
113 | ||
114 | if ((ctx->major = gss_acquire_cred(&ctx->minor, | |
115 | ctx->name, 0, oidset, GSS_C_ACCEPT, &ctx->creds, | |
116 | NULL, NULL))) | |
117 | ssh_gssapi_error(ctx); | |
118 | ||
119 | gss_release_oid_set(&status, &oidset); | |
120 | return (ctx->major); | |
121 | } else { | |
122 | ctx->name = GSS_C_NO_NAME; | |
123 | ctx->creds = GSS_C_NO_CREDENTIAL; | |
124 | } | |
125 | return GSS_S_COMPLETE; | |
126 | } | |
127 | ||
fa0f0f45 | 128 | /* Privileged */ |
129 | OM_uint32 | |
130 | ssh_gssapi_server_ctx(Gssctxt **ctx, gss_OID oid) | |
131 | { | |
132 | if (*ctx) | |
133 | ssh_gssapi_delete_ctx(ctx); | |
134 | ssh_gssapi_build_ctx(ctx); | |
135 | ssh_gssapi_set_oid(*ctx, oid); | |
136 | return (ssh_gssapi_acquire_cred(*ctx)); | |
137 | } | |
138 | ||
f97edba6 | 139 | /* Unprivileged */ |
140 | char * | |
141 | ssh_gssapi_server_mechanisms() { | |
142 | gss_OID_set supported; | |
143 | ||
144 | ssh_gssapi_supported_oids(&supported); | |
145 | return (ssh_gssapi_kex_mechs(supported, &ssh_gssapi_server_check_mech, | |
146 | NULL, NULL)); | |
147 | } | |
148 | ||
149 | /* Unprivileged */ | |
150 | int | |
151 | ssh_gssapi_server_check_mech(Gssctxt **dum, gss_OID oid, const char *data, | |
152 | const char *dummy) { | |
153 | Gssctxt *ctx = NULL; | |
154 | int res; | |
155 | ||
156 | res = !GSS_ERROR(PRIVSEP(ssh_gssapi_server_ctx(&ctx, oid))); | |
157 | ssh_gssapi_delete_ctx(&ctx); | |
158 | ||
159 | return (res); | |
160 | } | |
161 | ||
c5b7701b | 162 | /* Unprivileged */ |
163 | void | |
164 | ssh_gssapi_supported_oids(gss_OID_set *oidset) | |
165 | { | |
166 | int i = 0; | |
167 | OM_uint32 min_status; | |
168 | int present; | |
169 | gss_OID_set supported; | |
170 | ||
171 | gss_create_empty_oid_set(&min_status, oidset); | |
f97edba6 | 172 | |
c7931c9a | 173 | /* Ask privileged process what mechanisms it supports. */ |
174 | if (GSS_ERROR(PRIVSEP(gss_indicate_mechs(&min_status, &supported)))) | |
f97edba6 | 175 | return; |
c5b7701b | 176 | |
177 | while (supported_mechs[i]->name != NULL) { | |
178 | if (GSS_ERROR(gss_test_oid_set_member(&min_status, | |
179 | &supported_mechs[i]->oid, supported, &present))) | |
180 | present = 0; | |
181 | if (present) | |
182 | gss_add_oid_set_member(&min_status, | |
183 | &supported_mechs[i]->oid, oidset); | |
184 | i++; | |
185 | } | |
186 | ||
187 | gss_release_oid_set(&min_status, &supported); | |
188 | } | |
189 | ||
190 | ||
7cac2b65 | 191 | /* Wrapper around accept_sec_context |
192 | * Requires that the context contains: | |
193 | * oid | |
194 | * credentials (from ssh_gssapi_acquire_cred) | |
195 | */ | |
08822d99 | 196 | /* Privileged */ |
7cac2b65 | 197 | OM_uint32 |
198 | ssh_gssapi_accept_ctx(Gssctxt *ctx, gss_buffer_desc *recv_tok, | |
199 | gss_buffer_desc *send_tok, OM_uint32 *flags) | |
200 | { | |
201 | OM_uint32 status; | |
202 | gss_OID mech; | |
203 | ||
204 | ctx->major = gss_accept_sec_context(&ctx->minor, | |
205 | &ctx->context, ctx->creds, recv_tok, | |
206 | GSS_C_NO_CHANNEL_BINDINGS, &ctx->client, &mech, | |
207 | send_tok, flags, NULL, &ctx->client_creds); | |
208 | ||
209 | if (GSS_ERROR(ctx->major)) | |
210 | ssh_gssapi_error(ctx); | |
211 | ||
212 | if (ctx->client_creds) | |
213 | debug("Received some client credentials"); | |
214 | else | |
215 | debug("Got no client credentials"); | |
216 | ||
217 | status = ctx->major; | |
218 | ||
219 | /* Now, if we're complete and we have the right flags, then | |
220 | * we flag the user as also having been authenticated | |
221 | */ | |
222 | ||
223 | if (((flags == NULL) || ((*flags & GSS_C_MUTUAL_FLAG) && | |
224 | (*flags & GSS_C_INTEG_FLAG))) && (ctx->major == GSS_S_COMPLETE)) { | |
225 | if (ssh_gssapi_getclient(ctx, &gssapi_client)) | |
226 | fatal("Couldn't convert client name"); | |
b4cfa386 | 227 | #ifdef GSS_C_GLOBUS_LIMITED_PROXY_FLAG |
228 | if (flags && (*flags & GSS_C_GLOBUS_LIMITED_PROXY_FLAG)) | |
229 | limited=1; | |
230 | #endif | |
7cac2b65 | 231 | } |
232 | ||
233 | return (status); | |
234 | } | |
235 | ||
236 | /* | |
237 | * This parses an exported name, extracting the mechanism specific portion | |
238 | * to use for ACL checking. It verifies that the name belongs the mechanism | |
239 | * originally selected. | |
240 | */ | |
241 | static OM_uint32 | |
242 | ssh_gssapi_parse_ename(Gssctxt *ctx, gss_buffer_t ename, gss_buffer_t name) | |
243 | { | |
2ce0bfe4 | 244 | u_char *tok; |
7cac2b65 | 245 | OM_uint32 offset; |
246 | OM_uint32 oidl; | |
247 | ||
08822d99 | 248 | tok = ename->value; |
7cac2b65 | 249 | |
250 | #ifdef GSI /* GSI gss_export_name() is broken. */ | |
251 | if ((ctx->oid->length == gssapi_gsi_mech.oid.length) && | |
252 | (memcmp(ctx->oid->elements, gssapi_gsi_mech.oid.elements, | |
253 | gssapi_gsi_mech.oid.length) == 0)) { | |
254 | name->length = ename->length; | |
255 | name->value = xmalloc(ename->length+1); | |
256 | memcpy(name->value, ename->value, ename->length); | |
257 | return GSS_S_COMPLETE; | |
258 | } | |
259 | #endif | |
260 | ||
261 | /* | |
262 | * Check that ename is long enough for all of the fixed length | |
263 | * header, and that the initial ID bytes are correct | |
264 | */ | |
265 | ||
08822d99 | 266 | if (ename->length < 6 || memcmp(tok, "\x04\x01", 2) != 0) |
7cac2b65 | 267 | return GSS_S_FAILURE; |
268 | ||
269 | /* | |
270 | * Extract the OID, and check it. Here GSSAPI breaks with tradition | |
271 | * and does use the OID type and length bytes. To confuse things | |
272 | * there are two lengths - the first including these, and the | |
273 | * second without. | |
274 | */ | |
275 | ||
30460aeb | 276 | oidl = get_u16(tok+2); /* length including next two bytes */ |
7cac2b65 | 277 | oidl = oidl-2; /* turn it into the _real_ length of the variable OID */ |
278 | ||
279 | /* | |
280 | * Check the BER encoding for correct type and length, that the | |
281 | * string is long enough and that the OID matches that in our context | |
282 | */ | |
283 | if (tok[4] != 0x06 || tok[5] != oidl || | |
284 | ename->length < oidl+6 || | |
08822d99 | 285 | !ssh_gssapi_check_oid(ctx, tok+6, oidl)) |
7cac2b65 | 286 | return GSS_S_FAILURE; |
287 | ||
288 | offset = oidl+6; | |
289 | ||
290 | if (ename->length < offset+4) | |
291 | return GSS_S_FAILURE; | |
292 | ||
30460aeb | 293 | name->length = get_u32(tok+offset); |
7cac2b65 | 294 | offset += 4; |
295 | ||
296 | if (ename->length < offset+name->length) | |
297 | return GSS_S_FAILURE; | |
298 | ||
299 | name->value = xmalloc(name->length+1); | |
30460aeb | 300 | memcpy(name->value, tok+offset, name->length); |
7cac2b65 | 301 | ((char *)name->value)[name->length] = 0; |
302 | ||
303 | return GSS_S_COMPLETE; | |
304 | } | |
305 | ||
306 | /* Extract the client details from a given context. This can only reliably | |
307 | * be called once for a context */ | |
308 | ||
08822d99 | 309 | /* Privileged (called from accept_secure_ctx) */ |
7cac2b65 | 310 | OM_uint32 |
311 | ssh_gssapi_getclient(Gssctxt *ctx, ssh_gssapi_client *client) | |
312 | { | |
313 | int i = 0; | |
f97edba6 | 314 | int equal = 0; |
315 | gss_name_t new_name = GSS_C_NO_NAME; | |
316 | gss_buffer_desc ename = GSS_C_EMPTY_BUFFER; | |
317 | ||
318 | if (options.gss_store_rekey && client->used && ctx->client_creds) { | |
319 | if (client->mech->oid.length != ctx->oid->length || | |
320 | (memcmp(client->mech->oid.elements, | |
321 | ctx->oid->elements, ctx->oid->length) !=0)) { | |
322 | debug("Rekeyed credentials have different mechanism"); | |
323 | return GSS_S_COMPLETE; | |
324 | } | |
325 | ||
c7931c9a | 326 | /* Call gss_inquire_cred rather than gss_inquire_cred_by_mech |
327 | because GSI doesn't support the latter. -jbasney */ | |
328 | ||
329 | if ((ctx->major = gss_inquire_cred(&ctx->minor, | |
330 | ctx->client_creds, &new_name, | |
f97edba6 | 331 | NULL, NULL, NULL))) { |
332 | ssh_gssapi_error(ctx); | |
333 | return (ctx->major); | |
334 | } | |
7cac2b65 | 335 | |
f97edba6 | 336 | ctx->major = gss_compare_name(&ctx->minor, client->name, |
337 | new_name, &equal); | |
0fff78ff | 338 | |
f97edba6 | 339 | if (GSS_ERROR(ctx->major)) { |
340 | ssh_gssapi_error(ctx); | |
341 | return (ctx->major); | |
342 | } | |
343 | ||
344 | if (!equal) { | |
345 | debug("Rekeyed credentials have different name"); | |
346 | return GSS_S_COMPLETE; | |
347 | } | |
348 | ||
349 | debug("Marking rekeyed credentials for export"); | |
350 | ||
351 | gss_release_name(&ctx->minor, &client->name); | |
352 | gss_release_cred(&ctx->minor, &client->creds); | |
353 | client->name = new_name; | |
354 | client->creds = ctx->client_creds; | |
355 | ctx->client_creds = GSS_C_NO_CREDENTIAL; | |
356 | client->updated = 1; | |
357 | return GSS_S_COMPLETE; | |
358 | } | |
7cac2b65 | 359 | |
360 | client->mech = NULL; | |
361 | ||
362 | while (supported_mechs[i]->name != NULL) { | |
363 | if (supported_mechs[i]->oid.length == ctx->oid->length && | |
364 | (memcmp(supported_mechs[i]->oid.elements, | |
365 | ctx->oid->elements, ctx->oid->length) == 0)) | |
366 | client->mech = supported_mechs[i]; | |
367 | i++; | |
368 | } | |
369 | ||
370 | if (client->mech == NULL) | |
371 | return GSS_S_FAILURE; | |
372 | ||
c7931c9a | 373 | /* Call gss_inquire_cred rather than gss_inquire_cred_by_mech |
374 | because GSI doesn't support the latter. -jbasney */ | |
375 | ||
f97edba6 | 376 | if (ctx->client_creds && |
c7931c9a | 377 | (ctx->major = gss_inquire_cred(&ctx->minor, |
378 | ctx->client_creds, &client->name, NULL, NULL, NULL))) { | |
f97edba6 | 379 | ssh_gssapi_error(ctx); |
380 | return (ctx->major); | |
381 | } | |
382 | ||
7cac2b65 | 383 | if ((ctx->major = gss_display_name(&ctx->minor, ctx->client, |
384 | &client->displayname, NULL))) { | |
385 | ssh_gssapi_error(ctx); | |
386 | return (ctx->major); | |
387 | } | |
388 | ||
389 | if ((ctx->major = gss_export_name(&ctx->minor, ctx->client, | |
390 | &ename))) { | |
391 | ssh_gssapi_error(ctx); | |
392 | return (ctx->major); | |
393 | } | |
394 | ||
395 | if ((ctx->major = ssh_gssapi_parse_ename(ctx,&ename, | |
396 | &client->exportedname))) { | |
397 | return (ctx->major); | |
398 | } | |
399 | ||
f97edba6 | 400 | gss_release_buffer(&ctx->minor, &ename); |
401 | ||
7cac2b65 | 402 | /* We can't copy this structure, so we just move the pointer to it */ |
403 | client->creds = ctx->client_creds; | |
404 | ctx->client_creds = GSS_C_NO_CREDENTIAL; | |
682b256d | 405 | |
406 | /* needed for globus_gss_assist_map_and_authorize() */ | |
407 | client->context = ctx->context; | |
408 | ||
7cac2b65 | 409 | return (ctx->major); |
410 | } | |
411 | ||
540d72c3 | 412 | /* As user - called on fatal/exit */ |
7cac2b65 | 413 | void |
540d72c3 | 414 | ssh_gssapi_cleanup_creds(void) |
7cac2b65 | 415 | { |
416 | if (gssapi_client.store.filename != NULL) { | |
417 | /* Unlink probably isn't sufficient */ | |
30460aeb | 418 | debug("removing gssapi cred file\"%s\"", |
419 | gssapi_client.store.filename); | |
7cac2b65 | 420 | unlink(gssapi_client.store.filename); |
421 | } | |
422 | } | |
423 | ||
424 | /* As user */ | |
425 | void | |
426 | ssh_gssapi_storecreds(void) | |
427 | { | |
428 | if (gssapi_client.mech && gssapi_client.mech->storecreds) { | |
ae82558b | 429 | if (options.gss_creds_path) { |
430 | gssapi_client.store.filename = | |
431 | expand_authorized_keys(options.gss_creds_path, | |
432 | the_authctxt->pw); | |
433 | } | |
7cac2b65 | 434 | (*gssapi_client.mech->storecreds)(&gssapi_client); |
7cac2b65 | 435 | } else |
436 | debug("ssh_gssapi_storecreds: Not a GSSAPI mechanism"); | |
437 | } | |
438 | ||
439 | /* This allows GSSAPI methods to do things to the childs environment based | |
440 | * on the passed authentication process and credentials. | |
441 | */ | |
442 | /* As user */ | |
443 | void | |
444 | ssh_gssapi_do_child(char ***envp, u_int *envsizep) | |
445 | { | |
446 | ||
447 | if (gssapi_client.store.envvar != NULL && | |
448 | gssapi_client.store.envval != NULL) { | |
7cac2b65 | 449 | debug("Setting %s to %s", gssapi_client.store.envvar, |
08822d99 | 450 | gssapi_client.store.envval); |
7cac2b65 | 451 | child_set_env(envp, envsizep, gssapi_client.store.envvar, |
2ce0bfe4 | 452 | gssapi_client.store.envval); |
7cac2b65 | 453 | } |
454 | } | |
455 | ||
08822d99 | 456 | /* Privileged */ |
7cac2b65 | 457 | int |
f97edba6 | 458 | ssh_gssapi_userok(char *user, struct passwd *pw) |
7cac2b65 | 459 | { |
2ce0bfe4 | 460 | OM_uint32 lmin; |
461 | ||
7cac2b65 | 462 | if (gssapi_client.exportedname.length == 0 || |
463 | gssapi_client.exportedname.value == NULL) { | |
464 | debug("No suitable client data"); | |
465 | return 0; | |
466 | } | |
b4cfa386 | 467 | #ifdef GSS_C_GLOBUS_LIMITED_PROXY_FLAG |
826a9049 | 468 | if (limited && options.gsi_allow_limited_proxy != 1) { |
b4cfa386 | 469 | debug("limited proxy not acceptable for remote login"); |
470 | return 0; | |
471 | } | |
472 | #endif | |
7cac2b65 | 473 | if (gssapi_client.mech && gssapi_client.mech->userok) |
f97edba6 | 474 | if ((*gssapi_client.mech->userok)(&gssapi_client, user)) { |
475 | gssapi_client.used = 1; | |
476 | gssapi_client.store.owner = pw; | |
2ce0bfe4 | 477 | return 1; |
f97edba6 | 478 | } else { |
2ce0bfe4 | 479 | /* Destroy delegated credentials if userok fails */ |
480 | gss_release_buffer(&lmin, &gssapi_client.displayname); | |
481 | gss_release_buffer(&lmin, &gssapi_client.exportedname); | |
482 | gss_release_cred(&lmin, &gssapi_client.creds); | |
483 | memset(&gssapi_client, 0, sizeof(ssh_gssapi_client)); | |
484 | return 0; | |
485 | } | |
7cac2b65 | 486 | else |
487 | debug("ssh_gssapi_userok: Unknown GSSAPI mechanism"); | |
488 | return (0); | |
489 | } | |
490 | ||
c5b7701b | 491 | /* ssh_gssapi_checkmic() moved to gss-genr.c so it can be called by |
492 | kexgss_client(). */ | |
493 | ||
e23e524c | 494 | /* Priviledged */ |
23987cb8 | 495 | int |
496 | ssh_gssapi_localname(char **user) | |
497 | { | |
498 | *user = NULL; | |
7cac2b65 | 499 | if (gssapi_client.displayname.length==0 || |
500 | gssapi_client.displayname.value==NULL) { | |
23987cb8 | 501 | debug("No suitable client data"); |
502 | return(0);; | |
503 | } | |
504 | if (gssapi_client.mech && gssapi_client.mech->localname) { | |
505 | return((*gssapi_client.mech->localname)(&gssapi_client,user)); | |
506 | } else { | |
507 | debug("Unknown client authentication type"); | |
508 | } | |
509 | return(0); | |
510 | } | |
540d72c3 | 511 | |
f97edba6 | 512 | /* These bits are only used for rekeying. The unpriviledged child is running |
513 | * as the user, the monitor is root. | |
514 | * | |
515 | * In the child, we want to : | |
516 | * *) Ask the monitor to store our credentials into the store we specify | |
517 | * *) If it succeeds, maybe do a PAM update | |
518 | */ | |
519 | ||
520 | /* Stuff for PAM */ | |
521 | ||
522 | #ifdef USE_PAM | |
523 | static int ssh_gssapi_simple_conv(int n, const struct pam_message **msg, | |
524 | struct pam_response **resp, void *data) | |
cdd66111 | 525 | { |
f97edba6 | 526 | return (PAM_CONV_ERR); |
527 | } | |
528 | #endif | |
cdd66111 | 529 | |
f97edba6 | 530 | void |
531 | ssh_gssapi_rekey_creds() { | |
532 | int ok; | |
f97edba6 | 533 | #ifdef USE_PAM |
bed61975 | 534 | int ret; |
f97edba6 | 535 | pam_handle_t *pamh = NULL; |
536 | struct pam_conv pamconv = {ssh_gssapi_simple_conv, NULL}; | |
537 | char *envstr; | |
538 | #endif | |
539 | ||
540 | if (gssapi_client.store.filename == NULL && | |
541 | gssapi_client.store.envval == NULL && | |
542 | gssapi_client.store.envvar == NULL) | |
543 | return; | |
544 | ||
545 | ok = PRIVSEP(ssh_gssapi_update_creds(&gssapi_client.store)); | |
546 | ||
547 | if (!ok) | |
548 | return; | |
549 | ||
550 | debug("Rekeyed credentials stored successfully"); | |
551 | ||
552 | /* Actually managing to play with the ssh pam stack from here will | |
553 | * be next to impossible. In any case, we may want different options | |
554 | * for rekeying. So, use our own :) | |
555 | */ | |
556 | #ifdef USE_PAM | |
557 | if (!use_privsep) { | |
558 | debug("Not even going to try and do PAM with privsep disabled"); | |
559 | return; | |
560 | } | |
561 | ||
562 | ret = pam_start("sshd-rekey", gssapi_client.store.owner->pw_name, | |
563 | &pamconv, &pamh); | |
564 | if (ret) | |
565 | return; | |
566 | ||
567 | xasprintf(&envstr, "%s=%s", gssapi_client.store.envvar, | |
568 | gssapi_client.store.envval); | |
569 | ||
570 | ret = pam_putenv(pamh, envstr); | |
571 | if (!ret) | |
572 | pam_setcred(pamh, PAM_REINITIALIZE_CRED); | |
573 | pam_end(pamh, PAM_SUCCESS); | |
574 | #endif | |
575 | } | |
576 | ||
577 | int | |
578 | ssh_gssapi_update_creds(ssh_gssapi_ccache *store) { | |
579 | int ok = 0; | |
580 | ||
581 | /* Check we've got credentials to store */ | |
582 | if (!gssapi_client.updated) | |
583 | return 0; | |
584 | ||
585 | gssapi_client.updated = 0; | |
586 | ||
587 | temporarily_use_uid(gssapi_client.store.owner); | |
588 | if (gssapi_client.mech && gssapi_client.mech->updatecreds) | |
589 | ok = (*gssapi_client.mech->updatecreds)(store, &gssapi_client); | |
590 | else | |
591 | debug("No update function for this mechanism"); | |
592 | ||
593 | restore_uid(); | |
594 | ||
595 | return ok; | |
cdd66111 | 596 | } |
597 | ||
23987cb8 | 598 | #endif |