lib/krb5/context.c

   1 /*
   2  * Copyright (c) 1997 - 2002 Kungliga Tekniska Högskolan
   3  * (Royal Institute of Technology, Stockholm, Sweden).
   4  * All rights reserved.
   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  *
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  *
  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  * 3. Neither the name of the Institute nor the names of its contributors
  18  *    may be used to endorse or promote products derived from this software
  19  *    without specific prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
  22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
  25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  31  * SUCH DAMAGE.
  32  */
  33
  34 #include "krb5_locl.h"
  35 #include <com_err.h>
  36
  37 RCSID("$Id$");
  38
  39 #define INIT_FIELD(C, T, E, D, F)                                       \
  40     (C)->E = krb5_config_get_ ## T ## _default ((C), NULL, (D),         \
  41                                                 "libdefaults", F, NULL)
  42
  43 /*
  44  * Set the list of etypes `ret_etypes' from the configuration variable
  45  * `name'
  46  */
  47
  48 static krb5_error_code
  49 set_etypes (krb5_context context,
  50             const char *name,
  51             krb5_enctype **ret_enctypes)
  52 {
  53     char **etypes_str;
  54     krb5_enctype *etypes = NULL;
  55
  56     etypes_str = krb5_config_get_strings(context, NULL, "libdefaults",
  57                                          name, NULL);
  58     if(etypes_str){
  59         int i, j, k;
  60         for(i = 0; etypes_str[i]; i++);
  61         etypes = malloc((i+1) * sizeof(*etypes));
  62         if (etypes == NULL) {
  63             krb5_config_free_strings (etypes_str);
  64             krb5_set_error_string (context, "malloc: out of memory");
  65             return ENOMEM;
  66         }
  67         for(j = 0, k = 0; j < i; j++) {
  68             if(krb5_string_to_enctype(context, etypes_str[j], &etypes[k]) == 0)
  69                 k++;
  70         }
  71         etypes[k] = ETYPE_NULL;
  72         krb5_config_free_strings(etypes_str);
  73     }
  74     *ret_enctypes = etypes;
  75     return 0;
  76 }
  77
  78 /*
  79  * read variables from the configuration file and set in `context'
  80  */
  81
  82 static krb5_error_code
  83 init_context_from_config_file(krb5_context context)
  84 {
  85     krb5_error_code ret;
  86     const char * tmp;
  87     krb5_enctype *tmptypes;
  88
  89     INIT_FIELD(context, time, max_skew, 5 * 60, "clockskew");
  90     INIT_FIELD(context, time, kdc_timeout, 3, "kdc_timeout");
  91     INIT_FIELD(context, int, max_retries, 3, "max_retries");
  92
  93     INIT_FIELD(context, string, http_proxy, NULL, "http_proxy");
  94
  95     ret = set_etypes (context, "default_etypes", &tmptypes);
  96     if(ret)
  97         return ret;
  98     free(context->etypes);
  99     context->etypes = tmptypes;
 100
 101     ret = set_etypes (context, "default_etypes_des", &tmptypes);
 102     if(ret)
 103         return ret;
 104     free(context->etypes_des);
 105     context->etypes_des = tmptypes;
 106
 107     /* default keytab name */
 108     tmp = NULL;
 109     if(!issuid())
 110         tmp = getenv("KRB5_KTNAME");
 111     if(tmp != NULL)
 112         context->default_keytab = tmp;
 113     else
 114         INIT_FIELD(context, string, default_keytab,
 115                    KEYTAB_DEFAULT, "default_keytab_name");
 116
 117     INIT_FIELD(context, string, default_keytab_modify,
 118                NULL, "default_keytab_modify_name");
 119
 120     INIT_FIELD(context, string, time_fmt,
 121                "%Y-%m-%dT%H:%M:%S", "time_format");
 122
 123     INIT_FIELD(context, string, date_fmt,
 124                "%Y-%m-%d", "date_format");
 125
 126     INIT_FIELD(context, bool, log_utc,
 127                FALSE, "log_utc");
 128
 129
 130
 131     /* init dns-proxy slime */
 132     tmp = krb5_config_get_string(context, NULL, "libdefaults",
 133                                  "dns_proxy", NULL);
 134     if(tmp)
 135         roken_gethostby_setup(context->http_proxy, tmp);
 136     krb5_free_host_realm (context, context->default_realms);
 137     context->default_realms = NULL;
 138
 139     {
 140         krb5_addresses addresses;
 141         char **adr, **a;
 142
 143         krb5_set_extra_addresses(context, NULL);
 144         adr = krb5_config_get_strings(context, NULL,
 145                                       "libdefaults",
 146                                       "extra_addresses",
 147                                       NULL);
 148         memset(&addresses, 0, sizeof(addresses));
 149         for(a = adr; a && *a; a++) {
 150             ret = krb5_parse_address(context, *a, &addresses);
 151             if (ret == 0) {
 152                 krb5_add_extra_addresses(context, &addresses);
 153                 krb5_free_addresses(context, &addresses);
 154             }
 155         }
 156         krb5_config_free_strings(adr);
 157
 158         krb5_set_ignore_addresses(context, NULL);
 159         adr = krb5_config_get_strings(context, NULL,
 160                                       "libdefaults",
 161                                       "ignore_addresses",
 162                                       NULL);
 163         memset(&addresses, 0, sizeof(addresses));
 164         for(a = adr; a && *a; a++) {
 165             ret = krb5_parse_address(context, *a, &addresses);
 166             if (ret == 0) {
 167                 krb5_add_ignore_addresses(context, &addresses);
 168                 krb5_free_addresses(context, &addresses);
 169             }
 170         }
 171         krb5_config_free_strings(adr);
 172     }
 173
 174     INIT_FIELD(context, bool, scan_interfaces, TRUE, "scan_interfaces");
 175     INIT_FIELD(context, int, fcache_vno, 0, "fcache_version");
 176     /* prefer dns_lookup_kdc over srv_lookup. */
 177     INIT_FIELD(context, bool, srv_lookup, TRUE, "srv_lookup");
 178     INIT_FIELD(context, bool, srv_lookup, context->srv_lookup, "dns_lookup_kdc");
 179     return 0;
 180 }
 181
 182 krb5_error_code
 183 krb5_init_context(krb5_context *context)
 184 {
 185     krb5_context p;
 186     krb5_error_code ret;
 187     char **files;
 188
 189     p = calloc(1, sizeof(*p));
 190     if(!p)
 191         return ENOMEM;
 192
 193     ret = krb5_get_default_config_files(&files);
 194     if(ret)
 195         goto out;
 196     ret = krb5_set_config_files(p, files);
 197     krb5_free_config_files(files);
 198     if(ret)
 199         goto out;
 200
 201     /* init error tables */
 202     krb5_init_ets(p);
 203
 204     p->cc_ops = NULL;
 205     p->num_cc_ops = 0;
 206     krb5_cc_register(p, &krb5_fcc_ops, TRUE);
 207     krb5_cc_register(p, &krb5_mcc_ops, TRUE);
 208
 209     p->num_kt_types = 0;
 210     p->kt_types     = NULL;
 211     krb5_kt_register (p, &krb5_fkt_ops);
 212     krb5_kt_register (p, &krb5_mkt_ops);
 213     krb5_kt_register (p, &krb5_akf_ops);
 214     krb5_kt_register (p, &krb4_fkt_ops);
 215     krb5_kt_register (p, &krb5_srvtab_fkt_ops);
 216     krb5_kt_register (p, &krb5_any_ops);
 217
 218 out:
 219     if(ret) {
 220         krb5_free_context(p);
 221         p = NULL;
 222     }
 223     *context = p;
 224     return ret;
 225 }
 226
 227 void
 228 krb5_free_context(krb5_context context)
 229 {
 230     free(context->etypes);
 231     free(context->etypes_des);
 232     krb5_free_host_realm (context, context->default_realms);
 233     krb5_config_file_free (context, context->cf);
 234     free_error_table (context->et_list);
 235     free(context->cc_ops);
 236     free(context->kt_types);
 237     krb5_clear_error_string(context);
 238     if(context->warn_dest != NULL)
 239         krb5_closelog(context, context->warn_dest);
 240     krb5_set_extra_addresses(context, NULL);
 241     krb5_set_ignore_addresses(context, NULL);
 242     free(context);
 243 }
 244
 245 krb5_error_code
 246 krb5_set_config_files(krb5_context context, char **filenames)
 247 {
 248     krb5_error_code ret;
 249     krb5_config_binding *tmp = NULL;
 250     while(filenames != NULL && *filenames != NULL && **filenames != '\0') {
 251         ret = krb5_config_parse_file_multi(context, *filenames, &tmp);
 252         if(ret != 0 && ret != ENOENT) {
 253             krb5_config_file_free(context, tmp);
 254             return ret;
 255         }
 256         filenames++;
 257     }
 258 #if 0
 259     /* with this enabled and if there are no config files, Kerberos is
 260        considererd disabled */
 261     if(tmp == NULL)
 262         return ENXIO;
 263 #endif
 264     krb5_config_file_free(context, context->cf);
 265     context->cf = tmp;
 266     ret = init_context_from_config_file(context);
 267     return ret;
 268 }
 269
 270 krb5_error_code
 271 krb5_get_default_config_files(char ***pfilenames)
 272 {
 273     const char *p, *q;
 274     char **pp;
 275     int n, i;
 276
 277     const char *files = NULL;
 278     if (pfilenames == NULL)
 279         return EINVAL;
 280     if(!issuid())
 281         files = getenv("KRB5_CONFIG");
 282     if (files == NULL)
 283         files = krb5_config_file;
 284
 285     for(n = 0, p = files; strsep_copy(&p, ":", NULL, 0) != -1; n++);
 286     pp = malloc((n + 1) * sizeof(*pp));
 287     if(pp == NULL)
 288         return ENOMEM;
 289
 290     n = 0;
 291     p = files;
 292     while(1) {
 293         ssize_t l;
 294         q = p;
 295         l = strsep_copy(&q, ":", NULL, 0);
 296         if(l == -1)
 297             break;
 298         pp[n] = malloc(l + 1);
 299         if(pp[n] == NULL) {
 300             krb5_free_config_files(pp);
 301             return ENOMEM;
 302         }
 303         l = strsep_copy(&p, ":", pp[n], l + 1);
 304         for(i = 0; i < n; i++)
 305             if(strcmp(pp[i], pp[n]) == 0) {
 306                 free(pp[n]);
 307                 goto skip;
 308             }
 309         n++;
 310     skip:;
 311     }
 312     pp[n] = NULL;
 313     *pfilenames = pp;
 314     return 0;
 315 }
 316
 317 void
 318 krb5_free_config_files(char **filenames)
 319 {
 320     char **p;
 321     for(p = filenames; *p != NULL; p++)
 322         free(*p);
 323     free(filenames);
 324 }
 325
 326 /*
 327  * set `etype' to a malloced list of the default enctypes
 328  */
 329
 330 static krb5_error_code
 331 default_etypes(krb5_context context, krb5_enctype **etype)
 332 {
 333     krb5_enctype p[] = {
 334         ETYPE_DES3_CBC_SHA1,
 335         ETYPE_DES3_CBC_MD5,
 336         ETYPE_ARCFOUR_HMAC_MD5,
 337         ETYPE_DES_CBC_MD5,
 338         ETYPE_DES_CBC_MD4,
 339         ETYPE_DES_CBC_CRC,
 340         ETYPE_NULL
 341     };
 342
 343     *etype = malloc(sizeof(p));
 344     if(*etype == NULL) {
 345         krb5_set_error_string (context, "malloc: out of memory");
 346         return ENOMEM;
 347     }
 348     memcpy(*etype, p, sizeof(p));
 349     return 0;
 350 }
 351
 352 krb5_error_code
 353 krb5_set_default_in_tkt_etypes(krb5_context context,
 354                                const krb5_enctype *etypes)
 355 {
 356     int i;
 357     krb5_enctype *p = NULL;
 358
 359     if(etypes) {
 360         for (i = 0; etypes[i]; ++i)
 361             if(!krb5_enctype_valid(context, etypes[i])) {
 362                 krb5_set_error_string(context, "enctype %d not supported",
 363                                       etypes[i]);
 364                 return KRB5_PROG_ETYPE_NOSUPP;
 365             }
 366         ++i;
 367         ALLOC(p, i);
 368         if(!p) {
 369             krb5_set_error_string (context, "malloc: out of memory");
 370             return ENOMEM;
 371         }
 372         memmove(p, etypes, i * sizeof(krb5_enctype));
 373     }
 374     if(context->etypes)
 375         free(context->etypes);
 376     context->etypes = p;
 377     return 0;
 378 }
 379
 380
 381 krb5_error_code
 382 krb5_get_default_in_tkt_etypes(krb5_context context,
 383                                krb5_enctype **etypes)
 384 {
 385   krb5_enctype *p;
 386   int i;
 387   krb5_error_code ret;
 388
 389   if(context->etypes) {
 390     for(i = 0; context->etypes[i]; i++);
 391     ++i;
 392     ALLOC(p, i);
 393     if(!p) {
 394       krb5_set_error_string (context, "malloc: out of memory");
 395       return ENOMEM;
 396     }
 397     memmove(p, context->etypes, i * sizeof(krb5_enctype));
 398   } else {
 399     ret = default_etypes(context, &p);
 400     if (ret)
 401       return ret;
 402   }
 403   *etypes = p;
 404   return 0;
 405 }
 406
 407 const char *
 408 krb5_get_err_text(krb5_context context, krb5_error_code code)
 409 {
 410     const char *p = NULL;
 411     if(context != NULL)
 412         p = com_right(context->et_list, code);
 413     if(p == NULL)
 414         p = strerror(code);
 415     return p;
 416 }
 417
 418 void
 419 krb5_init_ets(krb5_context context)
 420 {
 421     if(context->et_list == NULL){
 422         krb5_add_et_list(context, initialize_krb5_error_table_r);
 423         krb5_add_et_list(context, initialize_asn1_error_table_r);
 424         krb5_add_et_list(context, initialize_heim_error_table_r);
 425         krb5_add_et_list(context, initialize_k524_error_table_r);
 426     }
 427 }
 428
 429 void
 430 krb5_set_use_admin_kdc (krb5_context context, krb5_boolean flag)
 431 {
 432     context->use_admin_kdc = flag;
 433 }
 434
 435 krb5_boolean
 436 krb5_get_use_admin_kdc (krb5_context context)
 437 {
 438     return context->use_admin_kdc;
 439 }
 440
 441 krb5_error_code
 442 krb5_add_extra_addresses(krb5_context context, krb5_addresses *addresses)
 443 {
 444
 445     if(context->extra_addresses)
 446         return krb5_append_addresses(context,
 447                                      context->extra_addresses, addresses);
 448     else
 449         return krb5_set_extra_addresses(context, addresses);
 450 }
 451
 452 krb5_error_code
 453 krb5_set_extra_addresses(krb5_context context, const krb5_addresses *addresses)
 454 {
 455     if(context->extra_addresses)
 456         krb5_free_addresses(context, context->extra_addresses);
 457
 458     if(addresses == NULL) {
 459         if(context->extra_addresses != NULL) {
 460             free(context->extra_addresses);
 461             context->extra_addresses = NULL;
 462         }
 463         return 0;
 464     }
 465     if(context->extra_addresses == NULL) {
 466         context->extra_addresses = malloc(sizeof(*context->extra_addresses));
 467         if(context->extra_addresses == NULL) {
 468             krb5_set_error_string (context, "malloc: out of memory");
 469             return ENOMEM;
 470         }
 471     }
 472     return krb5_copy_addresses(context, addresses, context->extra_addresses);
 473 }
 474
 475 krb5_error_code
 476 krb5_get_extra_addresses(krb5_context context, krb5_addresses *addresses)
 477 {
 478     if(context->extra_addresses == NULL) {
 479         memset(addresses, 0, sizeof(*addresses));
 480         return 0;
 481     }
 482     return krb5_copy_addresses(context,context->extra_addresses, addresses);
 483 }
 484
 485 krb5_error_code
 486 krb5_add_ignore_addresses(krb5_context context, krb5_addresses *addresses)
 487 {
 488
 489     if(context->ignore_addresses)
 490         return krb5_append_addresses(context,
 491                                      context->ignore_addresses, addresses);
 492     else
 493         return krb5_set_ignore_addresses(context, addresses);
 494 }
 495
 496 krb5_error_code
 497 krb5_set_ignore_addresses(krb5_context context, const krb5_addresses *addresses)
 498 {
 499     if(context->ignore_addresses)
 500         krb5_free_addresses(context, context->ignore_addresses);
 501     if(addresses == NULL) {
 502         if(context->ignore_addresses != NULL) {
 503             free(context->ignore_addresses);
 504             context->ignore_addresses = NULL;
 505         }
 506         return 0;
 507     }
 508     if(context->ignore_addresses == NULL) {
 509         context->ignore_addresses = malloc(sizeof(*context->ignore_addresses));
 510         if(context->ignore_addresses == NULL) {
 511             krb5_set_error_string (context, "malloc: out of memory");
 512             return ENOMEM;
 513         }
 514     }
 515     return krb5_copy_addresses(context, addresses, context->ignore_addresses);
 516 }
 517
 518 krb5_error_code
 519 krb5_get_ignore_addresses(krb5_context context, krb5_addresses *addresses)
 520 {
 521     if(context->ignore_addresses == NULL) {
 522         memset(addresses, 0, sizeof(*addresses));
 523         return 0;
 524     }
 525     return krb5_copy_addresses(context, context->ignore_addresses, addresses);
 526 }
 527
 528 krb5_error_code
 529 krb5_set_fcache_version(krb5_context context, int version)
 530 {
 531     context->fcache_vno = version;
 532     return 0;
 533 }
 534
 535 krb5_error_code
 536 krb5_get_fcache_version(krb5_context context, int *version)
 537 {
 538     *version = context->fcache_vno;
 539     return 0;
 540 }