crypto/external/bsd/heimdal/dist/lib/gssapi/krb5/acquire_cred.c

   1 /*      $NetBSD: acquire_cred.c,v 1.1.1.2 2014/04/24 12:45:29 pettai Exp $      */
   2
   3 /*
   4  * Copyright (c) 1997 - 2005 Kungliga Tekniska Högskolan
   5  * (Royal Institute of Technology, Stockholm, Sweden).
   6  * All rights reserved.
   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  *
  12  * 1. Redistributions of source code must retain the above copyright
  13  *    notice, this list of conditions and the following disclaimer.
  14  *
  15  * 2. Redistributions in binary form must reproduce the above copyright
  16  *    notice, this list of conditions and the following disclaimer in the
  17  *    documentation and/or other materials provided with the distribution.
  18  *
  19  * 3. Neither the name of the Institute nor the names of its contributors
  20  *    may be used to endorse or promote products derived from this software
  21  *    without specific prior written permission.
  22  *
  23  * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
  24  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  25  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  26  * ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
  27  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  28  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  29  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  30  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  31  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  32  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  33  * SUCH DAMAGE.
  34  */
  35
  36 #include "gsskrb5_locl.h"
  37
  38 OM_uint32
  39 __gsskrb5_ccache_lifetime(OM_uint32 *minor_status,
  40                           krb5_context context,
  41                           krb5_ccache id,
  42                           krb5_principal principal,
  43                           OM_uint32 *lifetime)
  44 {
  45     krb5_creds in_cred, out_cred;
  46     krb5_const_realm realm;
  47     krb5_error_code kret;
  48
  49     memset(&in_cred, 0, sizeof(in_cred));
  50     in_cred.client = principal;
  51
  52     realm = krb5_principal_get_realm(context,  principal);
  53     if (realm == NULL) {
  54         _gsskrb5_clear_status ();
  55         *minor_status = KRB5_PRINC_NOMATCH; /* XXX */
  56         return GSS_S_FAILURE;
  57     }
  58
  59     kret = krb5_make_principal(context, &in_cred.server,
  60                                realm, KRB5_TGS_NAME, realm, NULL);
  61     if (kret) {
  62         *minor_status = kret;
  63         return GSS_S_FAILURE;
  64     }
  65
  66     kret = krb5_cc_retrieve_cred(context, id, 0, &in_cred, &out_cred);
  67     krb5_free_principal(context, in_cred.server);
  68     if (kret) {
  69         *minor_status = 0;
  70         *lifetime = 0;
  71         return GSS_S_COMPLETE;
  72     }
  73
  74     *lifetime = out_cred.times.endtime;
  75     krb5_free_cred_contents(context, &out_cred);
  76
  77     return GSS_S_COMPLETE;
  78 }
  79
  80
  81
  82
  83 static krb5_error_code
  84 get_keytab(krb5_context context, krb5_keytab *keytab)
  85 {
  86     krb5_error_code kret;
  87
  88     HEIMDAL_MUTEX_lock(&gssapi_keytab_mutex);
  89
  90     if (_gsskrb5_keytab != NULL) {
  91         char *name = NULL;
  92
  93         kret = krb5_kt_get_full_name(context, _gsskrb5_keytab, &name);
  94         if (kret == 0) {
  95             kret = krb5_kt_resolve(context, name, keytab);
  96             krb5_xfree(name);
  97         }
  98     } else
  99         kret = krb5_kt_default(context, keytab);
 100
 101     HEIMDAL_MUTEX_unlock(&gssapi_keytab_mutex);
 102
 103     return (kret);
 104 }
 105
 106 static OM_uint32 acquire_initiator_cred
 107                   (OM_uint32 * minor_status,
 108                    krb5_context context,
 109                    gss_const_OID credential_type,
 110                    const void *credential_data,
 111                    const gss_name_t desired_name,
 112                    OM_uint32 time_req,
 113                    gss_const_OID desired_mech,
 114                    gss_cred_usage_t cred_usage,
 115                    gsskrb5_cred handle
 116                   )
 117 {
 118     OM_uint32 ret;
 119     krb5_creds cred;
 120     krb5_principal def_princ;
 121     krb5_get_init_creds_opt *opt;
 122     krb5_ccache ccache;
 123     krb5_keytab keytab;
 124     krb5_error_code kret;
 125
 126     keytab = NULL;
 127     ccache = NULL;
 128     def_princ = NULL;
 129     ret = GSS_S_FAILURE;
 130     memset(&cred, 0, sizeof(cred));
 131
 132     /*
 133      * If we have a preferred principal, lets try to find it in all
 134      * caches, otherwise, fall back to default cache, ignore all
 135      * errors while searching.
 136      */
 137
 138     if (credential_type != GSS_C_NO_OID &&
 139         !gss_oid_equal(credential_type, GSS_C_CRED_PASSWORD)) {
 140         kret = KRB5_NOCREDS_SUPPLIED; /* XXX */
 141         goto end;
 142     }
 143
 144     if (handle->principal) {
 145         kret = krb5_cc_cache_match (context,
 146                                     handle->principal,
 147                                     &ccache);
 148         if (kret == 0) {
 149             ret = GSS_S_COMPLETE;
 150             goto found;
 151         }
 152     }
 153
 154     if (ccache == NULL) {
 155         kret = krb5_cc_default(context, &ccache);
 156         if (kret)
 157             goto end;
 158     }
 159     kret = krb5_cc_get_principal(context, ccache, &def_princ);
 160     if (kret != 0) {
 161         /* we'll try to use a keytab below */
 162         krb5_cc_close(context, ccache);
 163         def_princ = NULL;
 164         kret = 0;
 165     } else if (handle->principal == NULL)  {
 166         kret = krb5_copy_principal(context, def_princ, &handle->principal);
 167         if (kret)
 168             goto end;
 169     } else if (handle->principal != NULL &&
 170                krb5_principal_compare(context, handle->principal,
 171                                       def_princ) == FALSE) {
 172         krb5_free_principal(context, def_princ);
 173         def_princ = NULL;
 174         krb5_cc_close(context, ccache);
 175         ccache = NULL;
 176     }
 177     if (def_princ == NULL) {
 178         /* We have no existing credentials cache,
 179          * so attempt to get a TGT using a keytab.
 180          */
 181         if (handle->principal == NULL) {
 182             kret = krb5_get_default_principal(context, &handle->principal);
 183             if (kret)
 184                 goto end;
 185         }
 186         kret = krb5_get_init_creds_opt_alloc(context, &opt);
 187         if (kret)
 188             goto end;
 189         if (credential_type != GSS_C_NO_OID &&
 190             gss_oid_equal(credential_type, GSS_C_CRED_PASSWORD)) {
 191             gss_buffer_t password = (gss_buffer_t)credential_data;
 192
 193             /* XXX are we requiring password to be NUL terminated? */
 194
 195             kret = krb5_get_init_creds_password(context, &cred,
 196                                                 handle->principal,
 197                                                 password->value,
 198                                                 NULL, NULL, 0, NULL, opt);
 199         } else {
 200             kret = get_keytab(context, &keytab);
 201             if (kret) {
 202                 krb5_get_init_creds_opt_free(context, opt);
 203                 goto end;
 204             }
 205             kret = krb5_get_init_creds_keytab(context, &cred,
 206                                               handle->principal, keytab,
 207                                               0, NULL, opt);
 208         }
 209         krb5_get_init_creds_opt_free(context, opt);
 210         if (kret)
 211             goto end;
 212         kret = krb5_cc_new_unique(context, krb5_cc_type_memory,
 213                                   NULL, &ccache);
 214         if (kret)
 215             goto end;
 216         kret = krb5_cc_initialize(context, ccache, cred.client);
 217         if (kret) {
 218             krb5_cc_destroy(context, ccache);
 219             goto end;
 220         }
 221         kret = krb5_cc_store_cred(context, ccache, &cred);
 222         if (kret) {
 223             krb5_cc_destroy(context, ccache);
 224             goto end;
 225         }
 226         handle->lifetime = cred.times.endtime;
 227         handle->cred_flags |= GSS_CF_DESTROY_CRED_ON_RELEASE;
 228     } else {
 229
 230         ret = __gsskrb5_ccache_lifetime(minor_status,
 231                                         context,
 232                                         ccache,
 233                                         handle->principal,
 234                                         &handle->lifetime);
 235         if (ret != GSS_S_COMPLETE) {
 236             krb5_cc_close(context, ccache);
 237             goto end;
 238         }
 239         kret = 0;
 240     }
 241  found:
 242     handle->ccache = ccache;
 243     ret = GSS_S_COMPLETE;
 244
 245 end:
 246     if (cred.client != NULL)
 247         krb5_free_cred_contents(context, &cred);
 248     if (def_princ != NULL)
 249         krb5_free_principal(context, def_princ);
 250     if (keytab != NULL)
 251         krb5_kt_close(context, keytab);
 252     if (ret != GSS_S_COMPLETE && kret != 0)
 253         *minor_status = kret;
 254     return (ret);
 255 }
 256
 257 static OM_uint32 acquire_acceptor_cred
 258                   (OM_uint32 * minor_status,
 259                    krb5_context context,
 260                    gss_const_OID credential_type,
 261                    const void *credential_data,
 262                    const gss_name_t desired_name,
 263                    OM_uint32 time_req,
 264                    gss_const_OID desired_mech,
 265                    gss_cred_usage_t cred_usage,
 266                    gsskrb5_cred handle
 267                   )
 268 {
 269     OM_uint32 ret;
 270     krb5_error_code kret;
 271
 272     ret = GSS_S_FAILURE;
 273
 274     if (credential_type != GSS_C_NO_OID) {
 275         kret = EINVAL;
 276         goto end;
 277     }
 278
 279     kret = get_keytab(context, &handle->keytab);
 280     if (kret)
 281         goto end;
 282
 283     /* check that the requested principal exists in the keytab */
 284     if (handle->principal) {
 285         krb5_keytab_entry entry;
 286
 287         kret = krb5_kt_get_entry(context, handle->keytab,
 288                                  handle->principal, 0, 0, &entry);
 289         if (kret)
 290             goto end;
 291         krb5_kt_free_entry(context, &entry);
 292         ret = GSS_S_COMPLETE;
 293     } else {
 294         /*
 295          * Check if there is at least one entry in the keytab before
 296          * declaring it as an useful keytab.
 297          */
 298         krb5_keytab_entry tmp;
 299         krb5_kt_cursor c;
 300
 301         kret = krb5_kt_start_seq_get (context, handle->keytab, &c);
 302         if (kret)
 303             goto end;
 304         if (krb5_kt_next_entry(context, handle->keytab, &tmp, &c) == 0) {
 305             krb5_kt_free_entry(context, &tmp);
 306             ret = GSS_S_COMPLETE; /* ok found one entry */
 307         }
 308         krb5_kt_end_seq_get (context, handle->keytab, &c);
 309     }
 310 end:
 311     if (ret != GSS_S_COMPLETE) {
 312         if (handle->keytab != NULL)
 313             krb5_kt_close(context, handle->keytab);
 314         if (kret != 0) {
 315             *minor_status = kret;
 316         }
 317     }
 318     return (ret);
 319 }
 320
 321 OM_uint32 GSSAPI_CALLCONV _gsskrb5_acquire_cred
 322 (OM_uint32 * minor_status,
 323  const gss_name_t desired_name,
 324  OM_uint32 time_req,
 325  const gss_OID_set desired_mechs,
 326  gss_cred_usage_t cred_usage,
 327  gss_cred_id_t * output_cred_handle,
 328  gss_OID_set * actual_mechs,
 329  OM_uint32 * time_rec
 330     )
 331 {
 332     OM_uint32 ret;
 333
 334     if (desired_mechs) {
 335         int present = 0;
 336
 337         ret = gss_test_oid_set_member(minor_status, GSS_KRB5_MECHANISM,
 338                                       desired_mechs, &present);
 339         if (ret)
 340             return ret;
 341         if (!present) {
 342             *minor_status = 0;
 343             return GSS_S_BAD_MECH;
 344         }
 345     }
 346
 347     ret = _gsskrb5_acquire_cred_ext(minor_status,
 348                                     desired_name,
 349                                     GSS_C_NO_OID,
 350                                     NULL,
 351                                     time_req,
 352                                     GSS_KRB5_MECHANISM,
 353                                     cred_usage,
 354                                     output_cred_handle);
 355     if (ret)
 356         return ret;
 357
 358
 359     ret = _gsskrb5_inquire_cred(minor_status, *output_cred_handle,
 360                                 NULL, time_rec, NULL, actual_mechs);
 361     if (ret) {
 362         OM_uint32 tmp;
 363         _gsskrb5_release_cred(&tmp, output_cred_handle);
 364     }
 365
 366     return ret;
 367 }
 368
 369 OM_uint32 GSSAPI_CALLCONV _gsskrb5_acquire_cred_ext
 370 (OM_uint32 * minor_status,
 371  const gss_name_t desired_name,
 372  gss_const_OID credential_type,
 373  const void *credential_data,
 374  OM_uint32 time_req,
 375  gss_const_OID desired_mech,
 376  gss_cred_usage_t cred_usage,
 377  gss_cred_id_t * output_cred_handle
 378     )
 379 {
 380     krb5_context context;
 381     gsskrb5_cred handle;
 382     OM_uint32 ret;
 383
 384     cred_usage &= GSS_C_OPTION_MASK;
 385
 386     if (cred_usage != GSS_C_ACCEPT && cred_usage != GSS_C_INITIATE && cred_usage != GSS_C_BOTH) {
 387         *minor_status = GSS_KRB5_S_G_BAD_USAGE;
 388         return GSS_S_FAILURE;
 389     }
 390
 391     GSSAPI_KRB5_INIT(&context);
 392
 393     *output_cred_handle = NULL;
 394
 395     handle = calloc(1, sizeof(*handle));
 396     if (handle == NULL) {
 397         *minor_status = ENOMEM;
 398         return (GSS_S_FAILURE);
 399     }
 400
 401     HEIMDAL_MUTEX_init(&handle->cred_id_mutex);
 402
 403     if (desired_name != GSS_C_NO_NAME) {
 404         ret = _gsskrb5_canon_name(minor_status, context, 1, NULL,
 405                                   desired_name, &handle->principal);
 406         if (ret) {
 407             HEIMDAL_MUTEX_destroy(&handle->cred_id_mutex);
 408             free(handle);
 409             return ret;
 410         }
 411     }
 412     if (cred_usage == GSS_C_INITIATE || cred_usage == GSS_C_BOTH) {
 413         ret = acquire_initiator_cred(minor_status, context,
 414                                      credential_type, credential_data,
 415                                      desired_name, time_req,
 416                                      desired_mech, cred_usage, handle);
 417         if (ret != GSS_S_COMPLETE) {
 418             HEIMDAL_MUTEX_destroy(&handle->cred_id_mutex);
 419             krb5_free_principal(context, handle->principal);
 420             free(handle);
 421             return (ret);
 422         }
 423     }
 424     if (cred_usage == GSS_C_ACCEPT || cred_usage == GSS_C_BOTH) {
 425         ret = acquire_acceptor_cred(minor_status, context,
 426                                     credential_type, credential_data,
 427                                     desired_name, time_req,
 428                                     desired_mech, cred_usage, handle);
 429         if (ret != GSS_S_COMPLETE) {
 430             HEIMDAL_MUTEX_destroy(&handle->cred_id_mutex);
 431             krb5_free_principal(context, handle->principal);
 432             free(handle);
 433             return (ret);
 434         }
 435     }
 436     ret = gss_create_empty_oid_set(minor_status, &handle->mechanisms);
 437     if (ret == GSS_S_COMPLETE)
 438         ret = gss_add_oid_set_member(minor_status, GSS_KRB5_MECHANISM,
 439                                      &handle->mechanisms);
 440     if (ret != GSS_S_COMPLETE) {
 441         if (handle->mechanisms != NULL)
 442             gss_release_oid_set(NULL, &handle->mechanisms);
 443         HEIMDAL_MUTEX_destroy(&handle->cred_id_mutex);
 444         krb5_free_principal(context, handle->principal);
 445         free(handle);
 446         return (ret);
 447     }
 448     handle->usage = cred_usage;
 449     *minor_status = 0;
 450     *output_cred_handle = (gss_cred_id_t)handle;
 451     return (GSS_S_COMPLETE);
 452 }