1 /*-
2 * SPDX-License-Identifier: BSD-2-Clause
3 *
4 * Copyright (c) 2008 Isilon Inc http://www.isilon.com/
5 * Authors: Doug Rabson <dfr@rabson.org>
6 * Developed with Red Inc: Alfred Perlstein <alfred@freebsd.org>
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 */
29
30 #include <sys/param.h>
31 #include <sys/stat.h>
32 #include <sys/linker.h>
33 #include <sys/module.h>
34 #include <sys/queue.h>
35 #include <sys/socket.h>
36 #include <sys/sysctl.h>
37 #include <sys/syslog.h>
38 #include <ctype.h>
39 #include <dirent.h>
40 #include <err.h>
41 #include <errno.h>
42 #ifndef WITHOUT_KERBEROS
43 #include <krb5.h>
44 #endif
45 #include <netdb.h>
46 #include <pwd.h>
47 #include <signal.h>
48 #include <stdarg.h>
49 #include <stdio.h>
50 #include <stdlib.h>
51 #include <string.h>
52 #include <unistd.h>
53 #include <arpa/inet.h>
54 #include <netinet/in.h>
55 #include <gssapi/gssapi.h>
56 #include <rpc/rpc.h>
57 #include <rpc/rpc_com.h>
58
59 #include "gssd.h"
60
61 #ifndef _PATH_GSS_MECH
62 #define _PATH_GSS_MECH "/etc/gss/mech"
63 #endif
64 #ifndef _PATH_GSSDSOCK
65 #define _PATH_GSSDSOCK "/var/run/gssd.sock"
66 #endif
67 #define GSSD_CREDENTIAL_CACHE_FILE "/tmp/krb5cc_gssd"
68
69 struct gss_resource {
70 LIST_ENTRY(gss_resource) gr_link;
71 uint64_t gr_id; /* identifier exported to kernel */
72 void* gr_res; /* GSS-API resource pointer */
73 };
74 LIST_HEAD(gss_resource_list, gss_resource) gss_resources;
75 int gss_resource_count;
76 uint32_t gss_next_id;
77 uint32_t gss_start_time;
78 int debug_level;
79 static char ccfile_dirlist[PATH_MAX + 1], ccfile_substring[NAME_MAX + 1];
80 static char pref_realm[1024];
81 static int verbose;
82 static int hostbased_initiator_cred;
83 #ifndef WITHOUT_KERBEROS
84 /* 1.2.752.43.13.14 */
85 static gss_OID_desc gss_krb5_set_allowable_enctypes_x_desc =
86 {6, (void *) "\x2a\x85\x70\x2b\x0d\x0e"};
87 static gss_OID GSS_KRB5_SET_ALLOWABLE_ENCTYPES_X =
88 &gss_krb5_set_allowable_enctypes_x_desc;
89 static gss_OID_desc gss_krb5_mech_oid_x_desc =
90 {9, (void *) "\x2a\x86\x48\x86\xf7\x12\x01\x02\x02" };
91 static gss_OID GSS_KRB5_MECH_OID_X =
92 &gss_krb5_mech_oid_x_desc;
93 #endif
94
95 static void gssd_load_mech(void);
96 static int find_ccache_file(const char *, uid_t, char *);
97 static int is_a_valid_tgt_cache(const char *, uid_t, int *, time_t *);
98 static void gssd_verbose_out(const char *, ...);
99 #ifndef WITHOUT_KERBEROS
100 static krb5_error_code gssd_get_cc_from_keytab(const char *);
101 static OM_uint32 gssd_get_user_cred(OM_uint32 *, uid_t, gss_cred_id_t *);
102 #endif
103 void gssd_terminate(int);
104
105 extern void gssd_1(struct svc_req *rqstp, SVCXPRT *transp);
106 extern int gssd_syscall(char *path);
107
108 int
main(int argc,char ** argv)109 main(int argc, char **argv)
110 {
111 /*
112 * We provide an RPC service on a local-domain socket. The
113 * kernel's GSS-API code will pass what it can't handle
114 * directly to us.
115 */
116 struct sockaddr_un sun;
117 int fd, oldmask, ch, debug, jailed;
118 SVCXPRT *xprt;
119 size_t jailed_size;
120
121 /*
122 * Initialize the credential cache file name substring and the
123 * search directory list.
124 */
125 strlcpy(ccfile_substring, "krb5cc_", sizeof(ccfile_substring));
126 ccfile_dirlist[0] = '\0';
127 pref_realm[0] = '\0';
128 debug = 0;
129 verbose = 0;
130 while ((ch = getopt(argc, argv, "dhvs:c:r:")) != -1) {
131 switch (ch) {
132 case 'd':
133 debug_level++;
134 break;
135 case 'h':
136 #ifndef WITHOUT_KERBEROS
137 /*
138 * Enable use of a host based initiator credential
139 * in the default keytab file.
140 */
141 hostbased_initiator_cred = 1;
142 #else
143 errx(1, "This option not available when built"
144 " without MK_KERBEROS\n");
145 #endif
146 break;
147 case 'v':
148 verbose = 1;
149 break;
150 case 's':
151 #ifndef WITHOUT_KERBEROS
152 /*
153 * Set the directory search list. This enables use of
154 * find_ccache_file() to search the directories for a
155 * suitable credentials cache file.
156 */
157 strlcpy(ccfile_dirlist, optarg, sizeof(ccfile_dirlist));
158 #else
159 errx(1, "This option not available when built"
160 " without MK_KERBEROS\n");
161 #endif
162 break;
163 case 'c':
164 /*
165 * Specify a non-default credential cache file
166 * substring.
167 */
168 strlcpy(ccfile_substring, optarg,
169 sizeof(ccfile_substring));
170 break;
171 case 'r':
172 /*
173 * Set the preferred realm for the credential cache tgt.
174 */
175 strlcpy(pref_realm, optarg, sizeof(pref_realm));
176 break;
177 default:
178 fprintf(stderr,
179 "usage: %s [-d] [-s dir-list] [-c file-substring]"
180 " [-r preferred-realm]\n", argv[0]);
181 exit(1);
182 break;
183 }
184 }
185
186 gssd_load_mech();
187
188 if (!debug_level) {
189 if (daemon(0, 0) != 0)
190 err(1, "Can't daemonize");
191 signal(SIGINT, SIG_IGN);
192 signal(SIGQUIT, SIG_IGN);
193 signal(SIGHUP, SIG_IGN);
194 }
195 signal(SIGTERM, gssd_terminate);
196 signal(SIGPIPE, gssd_terminate);
197
198 memset(&sun, 0, sizeof sun);
199 sun.sun_family = AF_LOCAL;
200 unlink(_PATH_GSSDSOCK);
201 strcpy(sun.sun_path, _PATH_GSSDSOCK);
202 sun.sun_len = SUN_LEN(&sun);
203 fd = socket(AF_LOCAL, SOCK_STREAM, 0);
204 if (fd < 0) {
205 if (debug_level == 0) {
206 syslog(LOG_ERR, "Can't create local gssd socket");
207 exit(1);
208 }
209 err(1, "Can't create local gssd socket");
210 }
211 oldmask = umask(S_IXUSR|S_IRWXG|S_IRWXO);
212 if (bind(fd, (struct sockaddr *) &sun, sun.sun_len) < 0) {
213 if (debug_level == 0) {
214 syslog(LOG_ERR, "Can't bind local gssd socket");
215 exit(1);
216 }
217 err(1, "Can't bind local gssd socket");
218 }
219 umask(oldmask);
220 if (listen(fd, SOMAXCONN) < 0) {
221 if (debug_level == 0) {
222 syslog(LOG_ERR, "Can't listen on local gssd socket");
223 exit(1);
224 }
225 err(1, "Can't listen on local gssd socket");
226 }
227 xprt = svc_vc_create(fd, RPC_MAXDATASIZE, RPC_MAXDATASIZE);
228 if (!xprt) {
229 if (debug_level == 0) {
230 syslog(LOG_ERR,
231 "Can't create transport for local gssd socket");
232 exit(1);
233 }
234 err(1, "Can't create transport for local gssd socket");
235 }
236 if (!svc_reg(xprt, GSSD, GSSDVERS, gssd_1, NULL)) {
237 if (debug_level == 0) {
238 syslog(LOG_ERR,
239 "Can't register service for local gssd socket");
240 exit(1);
241 }
242 err(1, "Can't register service for local gssd socket");
243 }
244
245 LIST_INIT(&gss_resources);
246 gss_next_id = 1;
247 gss_start_time = time(0);
248
249 if (gssd_syscall(_PATH_GSSDSOCK) < 0) {
250 jailed = 0;
251 if (errno == EPERM) {
252 jailed_size = sizeof(jailed);
253 sysctlbyname("security.jail.jailed", &jailed,
254 &jailed_size, NULL, 0);
255 }
256 if (debug_level == 0) {
257 if (jailed != 0)
258 syslog(LOG_ERR, "Cannot start gssd."
259 " allow.nfsd must be configured");
260 else
261 syslog(LOG_ERR, "Cannot start gssd");
262 exit(1);
263 }
264 if (jailed != 0)
265 err(1, "Cannot start gssd."
266 " allow.nfsd must be configured");
267 else
268 err(1, "Cannot start gssd");
269 }
270 svc_run();
271 gssd_syscall("");
272
273 return (0);
274 }
275
276 static void
gssd_load_mech(void)277 gssd_load_mech(void)
278 {
279 FILE *fp;
280 char buf[256];
281 char *p;
282 char *name, *oid, *lib, *kobj;
283
284 fp = fopen(_PATH_GSS_MECH, "r");
285 if (!fp)
286 return;
287
288 while (fgets(buf, sizeof(buf), fp)) {
289 if (*buf == '#')
290 continue;
291 p = buf;
292 name = strsep(&p, "\t\n ");
293 if (p) while (isspace(*p)) p++;
294 oid = strsep(&p, "\t\n ");
295 if (p) while (isspace(*p)) p++;
296 lib = strsep(&p, "\t\n ");
297 if (p) while (isspace(*p)) p++;
298 kobj = strsep(&p, "\t\n ");
299 if (!name || !oid || !lib || !kobj)
300 continue;
301
302 if (strcmp(kobj, "-")) {
303 /*
304 * Attempt to load the kernel module if its
305 * not already present.
306 */
307 if (modfind(kobj) < 0) {
308 if (kldload(kobj) < 0) {
309 fprintf(stderr,
310 "%s: can't find or load kernel module %s for %s\n",
311 getprogname(), kobj, name);
312 }
313 }
314 }
315 }
316 fclose(fp);
317 }
318
319 static void *
gssd_find_resource(uint64_t id)320 gssd_find_resource(uint64_t id)
321 {
322 struct gss_resource *gr;
323
324 if (!id)
325 return (NULL);
326
327 LIST_FOREACH(gr, &gss_resources, gr_link)
328 if (gr->gr_id == id)
329 return (gr->gr_res);
330
331 return (NULL);
332 }
333
334 static uint64_t
gssd_make_resource(void * res)335 gssd_make_resource(void *res)
336 {
337 struct gss_resource *gr;
338
339 if (!res)
340 return (0);
341
342 gr = malloc(sizeof(struct gss_resource));
343 if (!gr)
344 return (0);
345 gr->gr_id = (gss_next_id++) + ((uint64_t) gss_start_time << 32);
346 gr->gr_res = res;
347 LIST_INSERT_HEAD(&gss_resources, gr, gr_link);
348 gss_resource_count++;
349 if (debug_level > 1)
350 printf("%d resources allocated\n", gss_resource_count);
351
352 return (gr->gr_id);
353 }
354
355 static void
gssd_delete_resource(uint64_t id)356 gssd_delete_resource(uint64_t id)
357 {
358 struct gss_resource *gr;
359
360 LIST_FOREACH(gr, &gss_resources, gr_link) {
361 if (gr->gr_id == id) {
362 LIST_REMOVE(gr, gr_link);
363 free(gr);
364 gss_resource_count--;
365 if (debug_level > 1)
366 printf("%d resources allocated\n",
367 gss_resource_count);
368 return;
369 }
370 }
371 }
372
373 static void
gssd_verbose_out(const char * fmt,...)374 gssd_verbose_out(const char *fmt, ...)
375 {
376 va_list ap;
377
378 if (verbose != 0) {
379 va_start(ap, fmt);
380 if (debug_level == 0)
381 vsyslog(LOG_INFO | LOG_DAEMON, fmt, ap);
382 else
383 vfprintf(stderr, fmt, ap);
384 va_end(ap);
385 }
386 }
387
388 bool_t
gssd_null_1_svc(void * argp,void * result,struct svc_req * rqstp)389 gssd_null_1_svc(void *argp, void *result, struct svc_req *rqstp)
390 {
391
392 gssd_verbose_out("gssd_null: done\n");
393 return (TRUE);
394 }
395
396 bool_t
gssd_init_sec_context_1_svc(init_sec_context_args * argp,init_sec_context_res * result,struct svc_req * rqstp)397 gssd_init_sec_context_1_svc(init_sec_context_args *argp, init_sec_context_res *result, struct svc_req *rqstp)
398 {
399 gss_cred_id_t cred = GSS_C_NO_CREDENTIAL;
400 gss_ctx_id_t ctx = GSS_C_NO_CONTEXT;
401 gss_name_t name = GSS_C_NO_NAME;
402 char ccname[PATH_MAX + 5 + 1], *cp, *cp2;
403 int gotone, gotcred;
404 OM_uint32 min_stat;
405 #ifndef WITHOUT_KERBEROS
406 gss_buffer_desc principal_desc;
407 char enctype[sizeof(uint32_t)];
408 int key_enctype;
409 OM_uint32 maj_stat;
410 #endif
411
412 memset(result, 0, sizeof(*result));
413 if (hostbased_initiator_cred != 0 && argp->cred != 0 &&
414 argp->uid == 0) {
415 /*
416 * These credentials are for a host based initiator name
417 * in a keytab file, which should now have credentials
418 * in /tmp/krb5cc_gssd, because gss_acquire_cred() did
419 * the equivalent of "kinit -k".
420 */
421 snprintf(ccname, sizeof(ccname), "FILE:%s",
422 GSSD_CREDENTIAL_CACHE_FILE);
423 } else if (ccfile_dirlist[0] != '\0' && argp->cred == 0) {
424 /*
425 * For the "-s" case and no credentials provided as an
426 * argument, search the directory list for an appropriate
427 * credential cache file. If the search fails, return failure.
428 */
429 gotone = 0;
430 cp = ccfile_dirlist;
431 do {
432 cp2 = strchr(cp, ':');
433 if (cp2 != NULL)
434 *cp2 = '\0';
435 gotone = find_ccache_file(cp, argp->uid, ccname);
436 if (gotone != 0)
437 break;
438 if (cp2 != NULL)
439 *cp2++ = ':';
440 cp = cp2;
441 } while (cp != NULL && *cp != '\0');
442 if (gotone == 0) {
443 result->major_status = GSS_S_CREDENTIALS_EXPIRED;
444 gssd_verbose_out("gssd_init_sec_context: -s no"
445 " credential cache file found for uid=%d\n",
446 (int)argp->uid);
447 return (TRUE);
448 }
449 } else {
450 /*
451 * If there wasn't a "-s" option or the credentials have
452 * been provided as an argument, do it the old way.
453 * When credentials are provided, the uid should be root.
454 */
455 if (argp->cred != 0 && argp->uid != 0) {
456 if (debug_level == 0)
457 syslog(LOG_ERR, "gss_init_sec_context:"
458 " cred for non-root");
459 else
460 fprintf(stderr, "gss_init_sec_context:"
461 " cred for non-root\n");
462 }
463 snprintf(ccname, sizeof(ccname), "FILE:/tmp/krb5cc_%d",
464 (int) argp->uid);
465 }
466 setenv("KRB5CCNAME", ccname, TRUE);
467
468 if (argp->cred) {
469 cred = gssd_find_resource(argp->cred);
470 if (!cred) {
471 result->major_status = GSS_S_CREDENTIALS_EXPIRED;
472 gssd_verbose_out("gssd_init_sec_context: cred"
473 " resource not found\n");
474 return (TRUE);
475 }
476 }
477 if (argp->ctx) {
478 ctx = gssd_find_resource(argp->ctx);
479 if (!ctx) {
480 result->major_status = GSS_S_CONTEXT_EXPIRED;
481 gssd_verbose_out("gssd_init_sec_context: context"
482 " resource not found\n");
483 return (TRUE);
484 }
485 }
486 if (argp->name) {
487 name = gssd_find_resource(argp->name);
488 if (!name) {
489 result->major_status = GSS_S_BAD_NAME;
490 gssd_verbose_out("gssd_init_sec_context: name"
491 " resource not found\n");
492 return (TRUE);
493 }
494 }
495 gotcred = 0;
496
497 result->major_status = gss_init_sec_context(&result->minor_status,
498 cred, &ctx, name, argp->mech_type,
499 argp->req_flags, argp->time_req, argp->input_chan_bindings,
500 &argp->input_token, &result->actual_mech_type,
501 &result->output_token, &result->ret_flags, &result->time_rec);
502 gssd_verbose_out("gssd_init_sec_context: done major=0x%x minor=%d"
503 " uid=%d\n", (unsigned int)result->major_status,
504 (int)result->minor_status, (int)argp->uid);
505 if (gotcred != 0)
506 gss_release_cred(&min_stat, &cred);
507
508 if (result->major_status == GSS_S_COMPLETE
509 || result->major_status == GSS_S_CONTINUE_NEEDED) {
510 if (argp->ctx)
511 result->ctx = argp->ctx;
512 else
513 result->ctx = gssd_make_resource(ctx);
514 }
515
516 return (TRUE);
517 }
518
519 bool_t
gssd_accept_sec_context_1_svc(accept_sec_context_args * argp,accept_sec_context_res * result,struct svc_req * rqstp)520 gssd_accept_sec_context_1_svc(accept_sec_context_args *argp, accept_sec_context_res *result, struct svc_req *rqstp)
521 {
522 gss_ctx_id_t ctx = GSS_C_NO_CONTEXT;
523 gss_cred_id_t cred = GSS_C_NO_CREDENTIAL;
524 gss_name_t src_name;
525 gss_cred_id_t delegated_cred_handle;
526
527 memset(result, 0, sizeof(*result));
528 if (argp->ctx) {
529 ctx = gssd_find_resource(argp->ctx);
530 if (!ctx) {
531 result->major_status = GSS_S_CONTEXT_EXPIRED;
532 gssd_verbose_out("gssd_accept_sec_context: ctx"
533 " resource not found\n");
534 return (TRUE);
535 }
536 }
537 if (argp->cred) {
538 cred = gssd_find_resource(argp->cred);
539 if (!cred) {
540 result->major_status = GSS_S_CREDENTIALS_EXPIRED;
541 gssd_verbose_out("gssd_accept_sec_context: cred"
542 " resource not found\n");
543 return (TRUE);
544 }
545 }
546
547 memset(result, 0, sizeof(*result));
548 result->major_status = gss_accept_sec_context(&result->minor_status,
549 &ctx, cred, &argp->input_token, argp->input_chan_bindings,
550 &src_name, &result->mech_type, &result->output_token,
551 &result->ret_flags, &result->time_rec,
552 &delegated_cred_handle);
553 gssd_verbose_out("gssd_accept_sec_context: done major=0x%x minor=%d\n",
554 (unsigned int)result->major_status, (int)result->minor_status);
555
556 if (result->major_status == GSS_S_COMPLETE
557 || result->major_status == GSS_S_CONTINUE_NEEDED) {
558 if (argp->ctx)
559 result->ctx = argp->ctx;
560 else
561 result->ctx = gssd_make_resource(ctx);
562 result->src_name = gssd_make_resource(src_name);
563 result->delegated_cred_handle =
564 gssd_make_resource(delegated_cred_handle);
565 }
566
567 return (TRUE);
568 }
569
570 bool_t
gssd_delete_sec_context_1_svc(delete_sec_context_args * argp,delete_sec_context_res * result,struct svc_req * rqstp)571 gssd_delete_sec_context_1_svc(delete_sec_context_args *argp, delete_sec_context_res *result, struct svc_req *rqstp)
572 {
573 gss_ctx_id_t ctx = gssd_find_resource(argp->ctx);
574
575 if (ctx) {
576 result->major_status = gss_delete_sec_context(
577 &result->minor_status, &ctx, &result->output_token);
578 gssd_delete_resource(argp->ctx);
579 } else {
580 result->major_status = GSS_S_COMPLETE;
581 result->minor_status = 0;
582 }
583 gssd_verbose_out("gssd_delete_sec_context: done major=0x%x minor=%d\n",
584 (unsigned int)result->major_status, (int)result->minor_status);
585
586 return (TRUE);
587 }
588
589 bool_t
gssd_export_sec_context_1_svc(export_sec_context_args * argp,export_sec_context_res * result,struct svc_req * rqstp)590 gssd_export_sec_context_1_svc(export_sec_context_args *argp, export_sec_context_res *result, struct svc_req *rqstp)
591 {
592 gss_ctx_id_t ctx = gssd_find_resource(argp->ctx);
593
594 if (ctx) {
595 result->major_status = gss_export_sec_context(
596 &result->minor_status, &ctx,
597 &result->interprocess_token);
598 result->format = KGSS_HEIMDAL_1_1;
599 gssd_delete_resource(argp->ctx);
600 } else {
601 result->major_status = GSS_S_FAILURE;
602 result->minor_status = 0;
603 result->interprocess_token.length = 0;
604 result->interprocess_token.value = NULL;
605 }
606 gssd_verbose_out("gssd_export_sec_context: done major=0x%x minor=%d\n",
607 (unsigned int)result->major_status, (int)result->minor_status);
608
609 return (TRUE);
610 }
611
612 bool_t
gssd_import_name_1_svc(import_name_args * argp,import_name_res * result,struct svc_req * rqstp)613 gssd_import_name_1_svc(import_name_args *argp, import_name_res *result, struct svc_req *rqstp)
614 {
615 gss_name_t name;
616
617 result->major_status = gss_import_name(&result->minor_status,
618 &argp->input_name_buffer, argp->input_name_type, &name);
619 gssd_verbose_out("gssd_import_name: done major=0x%x minor=%d\n",
620 (unsigned int)result->major_status, (int)result->minor_status);
621
622 if (result->major_status == GSS_S_COMPLETE)
623 result->output_name = gssd_make_resource(name);
624 else
625 result->output_name = 0;
626
627 return (TRUE);
628 }
629
630 /*
631 * If the name is a numeric IP host address, do a DNS lookup on it and
632 * return the DNS name in a malloc'd string.
633 */
634 static char *
gssd_conv_ip_to_dns(int len,char * name)635 gssd_conv_ip_to_dns(int len, char *name)
636 {
637 struct sockaddr_in sin;
638 struct sockaddr_in6 sin6;
639 char *retcp;
640
641 retcp = NULL;
642 if (len > 0) {
643 retcp = mem_alloc(NI_MAXHOST);
644 memcpy(retcp, name, len);
645 retcp[len] = '\0';
646 if (inet_pton(AF_INET, retcp, &sin.sin_addr) != 0) {
647 sin.sin_family = AF_INET;
648 sin.sin_len = sizeof(sin);
649 sin.sin_port = 0;
650 if (getnameinfo((struct sockaddr *)&sin,
651 sizeof(sin), retcp, NI_MAXHOST,
652 NULL, 0, NI_NAMEREQD) != 0) {
653 mem_free(retcp, NI_MAXHOST);
654 return (NULL);
655 }
656 } else if (inet_pton(AF_INET6, retcp, &sin6.sin6_addr) != 0) {
657 sin6.sin6_family = AF_INET6;
658 sin6.sin6_len = sizeof(sin6);
659 sin6.sin6_port = 0;
660 if (getnameinfo((struct sockaddr *)&sin6,
661 sizeof(sin6), retcp, NI_MAXHOST,
662 NULL, 0, NI_NAMEREQD) != 0) {
663 mem_free(retcp, NI_MAXHOST);
664 return (NULL);
665 }
666 } else {
667 mem_free(retcp, NI_MAXHOST);
668 return (NULL);
669 }
670 gssd_verbose_out("gssd_conv_ip_to_dns: %s\n", retcp);
671 }
672 return (retcp);
673 }
674
675 bool_t
gssd_canonicalize_name_1_svc(canonicalize_name_args * argp,canonicalize_name_res * result,struct svc_req * rqstp)676 gssd_canonicalize_name_1_svc(canonicalize_name_args *argp, canonicalize_name_res *result, struct svc_req *rqstp)
677 {
678 gss_name_t name = gssd_find_resource(argp->input_name);
679 gss_name_t output_name;
680
681 memset(result, 0, sizeof(*result));
682 if (!name) {
683 result->major_status = GSS_S_BAD_NAME;
684 return (TRUE);
685 }
686
687 result->major_status = gss_canonicalize_name(&result->minor_status,
688 name, argp->mech_type, &output_name);
689 gssd_verbose_out("gssd_canonicalize_name: done major=0x%x minor=%d\n",
690 (unsigned int)result->major_status, (int)result->minor_status);
691
692 if (result->major_status == GSS_S_COMPLETE)
693 result->output_name = gssd_make_resource(output_name);
694 else
695 result->output_name = 0;
696
697 return (TRUE);
698 }
699
700 bool_t
gssd_export_name_1_svc(export_name_args * argp,export_name_res * result,struct svc_req * rqstp)701 gssd_export_name_1_svc(export_name_args *argp, export_name_res *result, struct svc_req *rqstp)
702 {
703 gss_name_t name = gssd_find_resource(argp->input_name);
704
705 memset(result, 0, sizeof(*result));
706 if (!name) {
707 result->major_status = GSS_S_BAD_NAME;
708 gssd_verbose_out("gssd_export_name: name resource not found\n");
709 return (TRUE);
710 }
711
712 result->major_status = gss_export_name(&result->minor_status,
713 name, &result->exported_name);
714 gssd_verbose_out("gssd_export_name: done major=0x%x minor=%d\n",
715 (unsigned int)result->major_status, (int)result->minor_status);
716
717 return (TRUE);
718 }
719
720 bool_t
gssd_release_name_1_svc(release_name_args * argp,release_name_res * result,struct svc_req * rqstp)721 gssd_release_name_1_svc(release_name_args *argp, release_name_res *result, struct svc_req *rqstp)
722 {
723 gss_name_t name = gssd_find_resource(argp->input_name);
724
725 if (name) {
726 result->major_status = gss_release_name(&result->minor_status,
727 &name);
728 gssd_delete_resource(argp->input_name);
729 } else {
730 result->major_status = GSS_S_COMPLETE;
731 result->minor_status = 0;
732 }
733 gssd_verbose_out("gssd_release_name: done major=0x%x minor=%d\n",
734 (unsigned int)result->major_status, (int)result->minor_status);
735
736 return (TRUE);
737 }
738
739 bool_t
gssd_pname_to_uid_1_svc(pname_to_uid_args * argp,pname_to_uid_res * result,struct svc_req * rqstp)740 gssd_pname_to_uid_1_svc(pname_to_uid_args *argp, pname_to_uid_res *result, struct svc_req *rqstp)
741 {
742 gss_name_t name = gssd_find_resource(argp->pname);
743 uid_t uid;
744 char buf[1024], *bufp;
745 struct passwd pwd, *pw;
746 size_t buflen;
747 int error;
748 static size_t buflen_hint = 1024;
749
750 memset(result, 0, sizeof(*result));
751 if (name) {
752 result->major_status =
753 gss_pname_to_uid(&result->minor_status,
754 name, argp->mech, &uid);
755 if (result->major_status == GSS_S_COMPLETE) {
756 result->uid = uid;
757 buflen = buflen_hint;
758 for (;;) {
759 pw = NULL;
760 bufp = buf;
761 if (buflen > sizeof(buf))
762 bufp = malloc(buflen);
763 if (bufp == NULL)
764 break;
765 error = getpwuid_r(uid, &pwd, bufp, buflen,
766 &pw);
767 if (error != ERANGE)
768 break;
769 if (buflen > sizeof(buf))
770 free(bufp);
771 buflen += 1024;
772 if (buflen > buflen_hint)
773 buflen_hint = buflen;
774 }
775 if (pw) {
776 int len = NGROUPS;
777 int groups[NGROUPS];
778 result->gid = pw->pw_gid;
779 getgrouplist(pw->pw_name, pw->pw_gid,
780 groups, &len);
781 result->gidlist.gidlist_len = len;
782 result->gidlist.gidlist_val =
783 mem_alloc(len * sizeof(int));
784 memcpy(result->gidlist.gidlist_val, groups,
785 len * sizeof(int));
786 gssd_verbose_out("gssd_pname_to_uid: mapped"
787 " to uid=%d, gid=%d\n", (int)result->uid,
788 (int)result->gid);
789 } else {
790 result->gid = 65534;
791 result->gidlist.gidlist_len = 0;
792 result->gidlist.gidlist_val = NULL;
793 gssd_verbose_out("gssd_pname_to_uid: mapped"
794 " to uid=%d, but no groups\n",
795 (int)result->uid);
796 }
797 if (bufp != NULL && buflen > sizeof(buf))
798 free(bufp);
799 } else
800 gssd_verbose_out("gssd_pname_to_uid: failed major=0x%x"
801 " minor=%d\n", (unsigned int)result->major_status,
802 (int)result->minor_status);
803 } else {
804 result->major_status = GSS_S_BAD_NAME;
805 result->minor_status = 0;
806 gssd_verbose_out("gssd_pname_to_uid: no name\n");
807 }
808
809 return (TRUE);
810 }
811
812 bool_t
gssd_acquire_cred_1_svc(acquire_cred_args * argp,acquire_cred_res * result,struct svc_req * rqstp)813 gssd_acquire_cred_1_svc(acquire_cred_args *argp, acquire_cred_res *result, struct svc_req *rqstp)
814 {
815 gss_name_t desired_name = GSS_C_NO_NAME;
816 gss_cred_id_t cred;
817 char ccname[PATH_MAX + 5 + 1], *cp, *cp2;
818 int gotone;
819 #ifndef WITHOUT_KERBEROS
820 gss_buffer_desc namebuf;
821 uint32_t minstat;
822 krb5_error_code kret;
823 #endif
824
825 memset(result, 0, sizeof(*result));
826 if (argp->desired_name) {
827 desired_name = gssd_find_resource(argp->desired_name);
828 if (!desired_name) {
829 result->major_status = GSS_S_BAD_NAME;
830 gssd_verbose_out("gssd_acquire_cred: no desired name"
831 " found\n");
832 return (TRUE);
833 }
834 }
835
836 #ifndef WITHOUT_KERBEROS
837 if (hostbased_initiator_cred != 0 && argp->desired_name != 0 &&
838 argp->uid == 0 && argp->cred_usage == GSS_C_INITIATE) {
839 /* This is a host based initiator name in the keytab file. */
840 snprintf(ccname, sizeof(ccname), "FILE:%s",
841 GSSD_CREDENTIAL_CACHE_FILE);
842 setenv("KRB5CCNAME", ccname, TRUE);
843 result->major_status = gss_display_name(&result->minor_status,
844 desired_name, &namebuf, NULL);
845 gssd_verbose_out("gssd_acquire_cred: desired name for host "
846 "based initiator cred major=0x%x minor=%d\n",
847 (unsigned int)result->major_status,
848 (int)result->minor_status);
849 if (result->major_status != GSS_S_COMPLETE)
850 return (TRUE);
851 if (namebuf.length > PATH_MAX + 5) {
852 result->minor_status = 0;
853 result->major_status = GSS_S_FAILURE;
854 return (TRUE);
855 }
856 memcpy(ccname, namebuf.value, namebuf.length);
857 ccname[namebuf.length] = '\0';
858 if ((cp = strchr(ccname, '@')) != NULL)
859 *cp = '/';
860 kret = gssd_get_cc_from_keytab(ccname);
861 gssd_verbose_out("gssd_acquire_cred: using keytab entry for "
862 "%s, kerberos ret=%d\n", ccname, (int)kret);
863 gss_release_buffer(&minstat, &namebuf);
864 if (kret != 0) {
865 result->minor_status = kret;
866 result->major_status = GSS_S_FAILURE;
867 return (TRUE);
868 }
869 } else
870 #endif /* !WITHOUT_KERBEROS */
871 if (ccfile_dirlist[0] != '\0' && argp->desired_name == 0) {
872 /*
873 * For the "-s" case and no name provided as an
874 * argument, search the directory list for an appropriate
875 * credential cache file. If the search fails, return failure.
876 */
877 gotone = 0;
878 cp = ccfile_dirlist;
879 do {
880 cp2 = strchr(cp, ':');
881 if (cp2 != NULL)
882 *cp2 = '\0';
883 gotone = find_ccache_file(cp, argp->uid, ccname);
884 if (gotone != 0)
885 break;
886 if (cp2 != NULL)
887 *cp2++ = ':';
888 cp = cp2;
889 } while (cp != NULL && *cp != '\0');
890 if (gotone == 0) {
891 result->major_status = GSS_S_CREDENTIALS_EXPIRED;
892 gssd_verbose_out("gssd_acquire_cred: no cred cache"
893 " file found\n");
894 return (TRUE);
895 }
896 setenv("KRB5CCNAME", ccname, TRUE);
897 } else {
898 /*
899 * If there wasn't a "-s" option or the name has
900 * been provided as an argument, do it the old way.
901 * When a name is provided, it will normally exist in the
902 * default keytab file and the uid will be root.
903 */
904 if (argp->desired_name != 0 && argp->uid != 0) {
905 if (debug_level == 0)
906 syslog(LOG_ERR, "gss_acquire_cred:"
907 " principal_name for non-root");
908 else
909 fprintf(stderr, "gss_acquire_cred:"
910 " principal_name for non-root\n");
911 }
912 snprintf(ccname, sizeof(ccname), "FILE:/tmp/krb5cc_%d",
913 (int) argp->uid);
914 setenv("KRB5CCNAME", ccname, TRUE);
915 }
916
917 result->major_status = gss_acquire_cred(&result->minor_status,
918 desired_name, argp->time_req, argp->desired_mechs,
919 argp->cred_usage, &cred, &result->actual_mechs, &result->time_rec);
920 gssd_verbose_out("gssd_acquire_cred: done major=0x%x minor=%d\n",
921 (unsigned int)result->major_status, (int)result->minor_status);
922
923 if (result->major_status == GSS_S_COMPLETE)
924 result->output_cred = gssd_make_resource(cred);
925 else
926 result->output_cred = 0;
927
928 return (TRUE);
929 }
930
931 bool_t
gssd_set_cred_option_1_svc(set_cred_option_args * argp,set_cred_option_res * result,struct svc_req * rqstp)932 gssd_set_cred_option_1_svc(set_cred_option_args *argp, set_cred_option_res *result, struct svc_req *rqstp)
933 {
934 gss_cred_id_t cred = gssd_find_resource(argp->cred);
935
936 memset(result, 0, sizeof(*result));
937 if (!cred) {
938 result->major_status = GSS_S_CREDENTIALS_EXPIRED;
939 gssd_verbose_out("gssd_set_cred: no credentials\n");
940 return (TRUE);
941 }
942
943 result->major_status = gss_set_cred_option(&result->minor_status,
944 &cred, argp->option_name, &argp->option_value);
945 gssd_verbose_out("gssd_set_cred: done major=0x%x minor=%d\n",
946 (unsigned int)result->major_status, (int)result->minor_status);
947
948 return (TRUE);
949 }
950
951 bool_t
gssd_release_cred_1_svc(release_cred_args * argp,release_cred_res * result,struct svc_req * rqstp)952 gssd_release_cred_1_svc(release_cred_args *argp, release_cred_res *result, struct svc_req *rqstp)
953 {
954 gss_cred_id_t cred = gssd_find_resource(argp->cred);
955
956 if (cred) {
957 result->major_status = gss_release_cred(&result->minor_status,
958 &cred);
959 gssd_delete_resource(argp->cred);
960 } else {
961 result->major_status = GSS_S_COMPLETE;
962 result->minor_status = 0;
963 }
964 gssd_verbose_out("gssd_release_cred: done major=0x%x minor=%d\n",
965 (unsigned int)result->major_status, (int)result->minor_status);
966
967 return (TRUE);
968 }
969
970 bool_t
gssd_display_status_1_svc(display_status_args * argp,display_status_res * result,struct svc_req * rqstp)971 gssd_display_status_1_svc(display_status_args *argp, display_status_res *result, struct svc_req *rqstp)
972 {
973
974 result->message_context = argp->message_context;
975 result->major_status = gss_display_status(&result->minor_status,
976 argp->status_value, argp->status_type, argp->mech_type,
977 &result->message_context, &result->status_string);
978 gssd_verbose_out("gssd_display_status: done major=0x%x minor=%d\n",
979 (unsigned int)result->major_status, (int)result->minor_status);
980
981 return (TRUE);
982 }
983
984 bool_t
gssd_ip_to_dns_1_svc(ip_to_dns_args * argp,ip_to_dns_res * result,struct svc_req * rqstp)985 gssd_ip_to_dns_1_svc(ip_to_dns_args *argp, ip_to_dns_res *result, struct svc_req *rqstp)
986 {
987 char *host;
988
989 memset(result, 0, sizeof(*result));
990 /* Check to see if the name is actually an IP address. */
991 host = gssd_conv_ip_to_dns(argp->ip_addr.ip_addr_len,
992 argp->ip_addr.ip_addr_val);
993 if (host != NULL) {
994 result->major_status = GSS_S_COMPLETE;
995 result->dns_name.dns_name_len = strlen(host);
996 result->dns_name.dns_name_val = host;
997 return (TRUE);
998 }
999 result->major_status = GSS_S_FAILURE;
1000 return (TRUE);
1001 }
1002
1003 int
gssd_1_freeresult(SVCXPRT * transp,xdrproc_t xdr_result,caddr_t result)1004 gssd_1_freeresult(SVCXPRT *transp, xdrproc_t xdr_result, caddr_t result)
1005 {
1006 /*
1007 * We don't use XDR to free the results - anything which was
1008 * allocated came from GSS-API. We use xdr_result to figure
1009 * out what to do.
1010 */
1011 OM_uint32 junk;
1012
1013 if (xdr_result == (xdrproc_t) xdr_init_sec_context_res) {
1014 init_sec_context_res *p = (init_sec_context_res *) result;
1015 gss_release_buffer(&junk, &p->output_token);
1016 } else if (xdr_result == (xdrproc_t) xdr_accept_sec_context_res) {
1017 accept_sec_context_res *p = (accept_sec_context_res *) result;
1018 gss_release_buffer(&junk, &p->output_token);
1019 } else if (xdr_result == (xdrproc_t) xdr_delete_sec_context_res) {
1020 delete_sec_context_res *p = (delete_sec_context_res *) result;
1021 gss_release_buffer(&junk, &p->output_token);
1022 } else if (xdr_result == (xdrproc_t) xdr_export_sec_context_res) {
1023 export_sec_context_res *p = (export_sec_context_res *) result;
1024 if (p->interprocess_token.length)
1025 memset(p->interprocess_token.value, 0,
1026 p->interprocess_token.length);
1027 gss_release_buffer(&junk, &p->interprocess_token);
1028 } else if (xdr_result == (xdrproc_t) xdr_export_name_res) {
1029 export_name_res *p = (export_name_res *) result;
1030 gss_release_buffer(&junk, &p->exported_name);
1031 } else if (xdr_result == (xdrproc_t) xdr_acquire_cred_res) {
1032 acquire_cred_res *p = (acquire_cred_res *) result;
1033 gss_release_oid_set(&junk, &p->actual_mechs);
1034 } else if (xdr_result == (xdrproc_t) xdr_pname_to_uid_res) {
1035 pname_to_uid_res *p = (pname_to_uid_res *) result;
1036 if (p->gidlist.gidlist_val)
1037 free(p->gidlist.gidlist_val);
1038 } else if (xdr_result == (xdrproc_t) xdr_display_status_res) {
1039 display_status_res *p = (display_status_res *) result;
1040 gss_release_buffer(&junk, &p->status_string);
1041 }
1042
1043 return (TRUE);
1044 }
1045
1046 /*
1047 * Search a directory for the most likely candidate to be used as the
1048 * credential cache for a uid. If successful, return 1 and fill the
1049 * file's path id into "rpath". Otherwise, return 0.
1050 */
1051 static int
find_ccache_file(const char * dirpath,uid_t uid,char * rpath)1052 find_ccache_file(const char *dirpath, uid_t uid, char *rpath)
1053 {
1054 DIR *dirp;
1055 struct dirent *dp;
1056 struct stat sb;
1057 time_t exptime, oexptime;
1058 int gotone, len, rating, orating;
1059 char namepath[PATH_MAX + 5 + 1];
1060 char retpath[PATH_MAX + 5 + 1];
1061
1062 dirp = opendir(dirpath);
1063 if (dirp == NULL)
1064 return (0);
1065 gotone = 0;
1066 orating = 0;
1067 oexptime = 0;
1068 while ((dp = readdir(dirp)) != NULL) {
1069 len = snprintf(namepath, sizeof(namepath), "%s/%s", dirpath,
1070 dp->d_name);
1071 if (len < sizeof(namepath) &&
1072 (hostbased_initiator_cred == 0 || strcmp(namepath,
1073 GSSD_CREDENTIAL_CACHE_FILE) != 0) &&
1074 strstr(dp->d_name, ccfile_substring) != NULL &&
1075 lstat(namepath, &sb) >= 0 &&
1076 sb.st_uid == uid &&
1077 S_ISREG(sb.st_mode)) {
1078 len = snprintf(namepath, sizeof(namepath), "FILE:%s/%s",
1079 dirpath, dp->d_name);
1080 if (len < sizeof(namepath) &&
1081 is_a_valid_tgt_cache(namepath, uid, &rating,
1082 &exptime) != 0) {
1083 if (gotone == 0 || rating > orating ||
1084 (rating == orating && exptime > oexptime)) {
1085 orating = rating;
1086 oexptime = exptime;
1087 strcpy(retpath, namepath);
1088 gotone = 1;
1089 }
1090 }
1091 }
1092 }
1093 closedir(dirp);
1094 if (gotone != 0) {
1095 strcpy(rpath, retpath);
1096 return (1);
1097 }
1098 return (0);
1099 }
1100
1101 /*
1102 * Try to determine if the file is a valid tgt cache file.
1103 * Check that the file has a valid tgt for a principal.
1104 * If it does, return 1, otherwise return 0.
1105 * It also returns a "rating" and the expiry time for the TGT, when found.
1106 * This "rating" is higher based on heuristics that make it more
1107 * likely to be the correct credential cache file to use. It can
1108 * be used by the caller, along with expiry time, to select from
1109 * multiple credential cache files.
1110 */
1111 static int
is_a_valid_tgt_cache(const char * filepath,uid_t uid,int * retrating,time_t * retexptime)1112 is_a_valid_tgt_cache(const char *filepath, uid_t uid, int *retrating,
1113 time_t *retexptime)
1114 {
1115 #ifndef WITHOUT_KERBEROS
1116 krb5_context context;
1117 krb5_principal princ;
1118 krb5_ccache ccache;
1119 krb5_error_code retval;
1120 krb5_cc_cursor curse;
1121 krb5_creds krbcred;
1122 int gotone, orating, rating, ret;
1123 struct passwd *pw;
1124 char *cp, *cp2, *pname;
1125 time_t exptime;
1126
1127 /* Find a likely name for the uid principal. */
1128 pw = getpwuid(uid);
1129
1130 /*
1131 * Do a bunch of krb5 library stuff to try and determine if
1132 * this file is a credentials cache with an appropriate TGT
1133 * in it.
1134 */
1135 retval = krb5_init_context(&context);
1136 if (retval != 0)
1137 return (0);
1138 retval = krb5_cc_resolve(context, filepath, &ccache);
1139 if (retval != 0) {
1140 krb5_free_context(context);
1141 return (0);
1142 }
1143 ret = 0;
1144 orating = 0;
1145 exptime = 0;
1146 retval = krb5_cc_start_seq_get(context, ccache, &curse);
1147 if (retval == 0) {
1148 while ((retval = krb5_cc_next_cred(context, ccache, &curse,
1149 &krbcred)) == 0) {
1150 gotone = 0;
1151 rating = 0;
1152 retval = krb5_unparse_name(context, krbcred.server,
1153 &pname);
1154 if (retval == 0) {
1155 cp = strchr(pname, '/');
1156 if (cp != NULL) {
1157 *cp++ = '\0';
1158 if (strcmp(pname, "krbtgt") == 0 &&
1159 krbcred.times.endtime > time(NULL)
1160 ) {
1161 gotone = 1;
1162 /*
1163 * Test to see if this is a
1164 * tgt for cross-realm auth.
1165 * Rate it higher, if it is not.
1166 */
1167 cp2 = strchr(cp, '@');
1168 if (cp2 != NULL) {
1169 *cp2++ = '\0';
1170 if (strcmp(cp, cp2) ==
1171 0)
1172 rating++;
1173 }
1174 }
1175 }
1176 free(pname);
1177 }
1178 if (gotone != 0) {
1179 retval = krb5_unparse_name(context,
1180 krbcred.client, &pname);
1181 if (retval == 0) {
1182 cp = strchr(pname, '@');
1183 if (cp != NULL) {
1184 *cp++ = '\0';
1185 if (pw != NULL && strcmp(pname,
1186 pw->pw_name) == 0)
1187 rating++;
1188 if (strchr(pname, '/') == NULL)
1189 rating++;
1190 if (pref_realm[0] != '\0' &&
1191 strcmp(cp, pref_realm) == 0)
1192 rating++;
1193 }
1194 }
1195 free(pname);
1196 if (rating > orating) {
1197 orating = rating;
1198 exptime = krbcred.times.endtime;
1199 } else if (rating == orating &&
1200 krbcred.times.endtime > exptime)
1201 exptime = krbcred.times.endtime;
1202 ret = 1;
1203 }
1204 krb5_free_cred_contents(context, &krbcred);
1205 }
1206 krb5_cc_end_seq_get(context, ccache, &curse);
1207 }
1208 krb5_cc_close(context, ccache);
1209 krb5_free_context(context);
1210 if (ret != 0) {
1211 *retrating = orating;
1212 *retexptime = exptime;
1213 }
1214 return (ret);
1215 #else /* WITHOUT_KERBEROS */
1216 return (0);
1217 #endif /* !WITHOUT_KERBEROS */
1218 }
1219
1220 #ifndef WITHOUT_KERBEROS
1221 /*
1222 * This function attempts to do essentially a "kinit -k" for the principal
1223 * name provided as the argument, so that there will be a TGT in the
1224 * credential cache.
1225 */
1226 static krb5_error_code
gssd_get_cc_from_keytab(const char * name)1227 gssd_get_cc_from_keytab(const char *name)
1228 {
1229 krb5_error_code ret, opt_ret, princ_ret, cc_ret, kt_ret, cred_ret;
1230 krb5_context context;
1231 krb5_principal principal;
1232 krb5_keytab kt;
1233 krb5_creds cred;
1234 krb5_get_init_creds_opt *opt;
1235 krb5_deltat start_time = 0;
1236 krb5_ccache ccache;
1237
1238 ret = krb5_init_context(&context);
1239 if (ret != 0)
1240 return (ret);
1241 opt_ret = cc_ret = kt_ret = cred_ret = 1; /* anything non-zero */
1242 princ_ret = ret = krb5_parse_name(context, name, &principal);
1243 if (ret == 0)
1244 opt_ret = ret = krb5_get_init_creds_opt_alloc(context, &opt);
1245 if (ret == 0)
1246 cc_ret = ret = krb5_cc_default(context, &ccache);
1247 if (ret == 0)
1248 ret = krb5_cc_initialize(context, ccache, principal);
1249 if (ret == 0) {
1250 krb5_get_init_creds_opt_set_default_flags(context, "gssd",
1251 krb5_principal_get_realm(context, principal), opt);
1252 kt_ret = ret = krb5_kt_default(context, &kt);
1253 }
1254 if (ret == 0)
1255 cred_ret = ret = krb5_get_init_creds_keytab(context, &cred,
1256 principal, kt, start_time, NULL, opt);
1257 if (ret == 0)
1258 ret = krb5_cc_store_cred(context, ccache, &cred);
1259 if (kt_ret == 0)
1260 krb5_kt_close(context, kt);
1261 if (cc_ret == 0)
1262 krb5_cc_close(context, ccache);
1263 if (opt_ret == 0)
1264 krb5_get_init_creds_opt_free(context, opt);
1265 if (princ_ret == 0)
1266 krb5_free_principal(context, principal);
1267 if (cred_ret == 0)
1268 krb5_free_cred_contents(context, &cred);
1269 krb5_free_context(context);
1270 return (ret);
1271 }
1272
1273 /*
1274 * Acquire a gss credential for a uid.
1275 */
1276 static OM_uint32
gssd_get_user_cred(OM_uint32 * min_statp,uid_t uid,gss_cred_id_t * credp)1277 gssd_get_user_cred(OM_uint32 *min_statp, uid_t uid, gss_cred_id_t *credp)
1278 {
1279 gss_buffer_desc principal_desc;
1280 gss_name_t name;
1281 OM_uint32 maj_stat, min_stat;
1282 gss_OID_set mechlist;
1283 struct passwd *pw;
1284
1285 pw = getpwuid(uid);
1286 if (pw == NULL) {
1287 *min_statp = 0;
1288 return (GSS_S_FAILURE);
1289 }
1290
1291 /*
1292 * The mechanism must be set to KerberosV for acquisition
1293 * of credentials to work reliably.
1294 */
1295 maj_stat = gss_create_empty_oid_set(min_statp, &mechlist);
1296 if (maj_stat != GSS_S_COMPLETE)
1297 return (maj_stat);
1298 maj_stat = gss_add_oid_set_member(min_statp, GSS_KRB5_MECH_OID_X,
1299 &mechlist);
1300 if (maj_stat != GSS_S_COMPLETE) {
1301 gss_release_oid_set(&min_stat, &mechlist);
1302 return (maj_stat);
1303 }
1304
1305 principal_desc.value = (void *)pw->pw_name;
1306 principal_desc.length = strlen(pw->pw_name);
1307 maj_stat = gss_import_name(min_statp, &principal_desc,
1308 GSS_C_NT_USER_NAME, &name);
1309 if (maj_stat != GSS_S_COMPLETE) {
1310 gss_release_oid_set(&min_stat, &mechlist);
1311 return (maj_stat);
1312 }
1313 /* Acquire the credentials. */
1314 maj_stat = gss_acquire_cred(min_statp, name, 0, mechlist,
1315 GSS_C_INITIATE, credp, NULL, NULL);
1316 gss_release_name(&min_stat, &name);
1317 gss_release_oid_set(&min_stat, &mechlist);
1318 return (maj_stat);
1319 }
1320 #endif /* !WITHOUT_KERBEROS */
1321
gssd_terminate(int sig __unused)1322 void gssd_terminate(int sig __unused)
1323 {
1324
1325 #ifndef WITHOUT_KERBEROS
1326 if (hostbased_initiator_cred != 0)
1327 unlink(GSSD_CREDENTIAL_CACHE_FILE);
1328 #endif
1329 gssd_syscall("");
1330 exit(0);
1331 }
1332
1333