usr.sbin/gssd/gssd.c

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