crypto/dist/heimdal/lib/krb5/creds.c

   1 /*
   2  * Copyright (c) 1997 - 2005 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
  36 __RCSID("$Heimdal: creds.c 22062 2007-11-11 15:41:50Z lha $"
  37         "$NetBSD$");
  38
  39 #undef __attribute__
  40 #define __attribute__(X)
  41
  42 /* keep this for compatibility with older code */
  43 krb5_error_code KRB5_LIB_FUNCTION __attribute__((deprecated))
  44 krb5_free_creds_contents (krb5_context context, krb5_creds *c)
  45 {
  46     return krb5_free_cred_contents (context, c);
  47 }
  48
  49 /**
  50  * Free content of krb5_creds.
  51  *
  52  * @param context Kerberos 5 context.
  53  * @param c krb5_creds to free.
  54  *
  55  * @return Returns 0 to indicate success. Otherwise an kerberos et
  56  * error code is returned, see krb5_get_error_message().
  57  *
  58  * @ingroup krb5
  59  */
  60
  61 krb5_error_code KRB5_LIB_FUNCTION
  62 krb5_free_cred_contents (krb5_context context, krb5_creds *c)
  63 {
  64     krb5_free_principal (context, c->client);
  65     c->client = NULL;
  66     krb5_free_principal (context, c->server);
  67     c->server = NULL;
  68     krb5_free_keyblock_contents (context, &c->session);
  69     krb5_data_free (&c->ticket);
  70     krb5_data_free (&c->second_ticket);
  71     free_AuthorizationData (&c->authdata);
  72     krb5_free_addresses (context, &c->addresses);
  73     memset(c, 0, sizeof(*c));
  74     return 0;
  75 }
  76
  77 /**
  78  * Copy content of krb5_creds.
  79  *
  80  * @param context Kerberos 5 context.
  81  * @param incred source credential
  82  * @param c destination credential, free with krb5_free_cred_contents().
  83  *
  84  * @return Returns 0 to indicate success. Otherwise an kerberos et
  85  * error code is returned, see krb5_get_error_message().
  86  *
  87  * @ingroup krb5
  88  */
  89
  90 krb5_error_code KRB5_LIB_FUNCTION
  91 krb5_copy_creds_contents (krb5_context context,
  92                           const krb5_creds *incred,
  93                           krb5_creds *c)
  94 {
  95     krb5_error_code ret;
  96
  97     memset(c, 0, sizeof(*c));
  98     ret = krb5_copy_principal (context, incred->client, &c->client);
  99     if (ret)
 100         goto fail;
 101     ret = krb5_copy_principal (context, incred->server, &c->server);
 102     if (ret)
 103         goto fail;
 104     ret = krb5_copy_keyblock_contents (context, &incred->session, &c->session);
 105     if (ret)
 106         goto fail;
 107     c->times = incred->times;
 108     ret = krb5_data_copy (&c->ticket,
 109                           incred->ticket.data,
 110                           incred->ticket.length);
 111     if (ret)
 112         goto fail;
 113     ret = krb5_data_copy (&c->second_ticket,
 114                           incred->second_ticket.data,
 115                           incred->second_ticket.length);
 116     if (ret)
 117         goto fail;
 118     ret = copy_AuthorizationData(&incred->authdata, &c->authdata);
 119     if (ret)
 120         goto fail;
 121     ret = krb5_copy_addresses (context,
 122                                &incred->addresses,
 123                                &c->addresses);
 124     if (ret)
 125         goto fail;
 126     c->flags = incred->flags;
 127     return 0;
 128
 129 fail:
 130     krb5_free_cred_contents (context, c);
 131     return ret;
 132 }
 133
 134 /**
 135  * Copy krb5_creds.
 136  *
 137  * @param context Kerberos 5 context.
 138  * @param incred source credential
 139  * @param outcred destination credential, free with krb5_free_creds().
 140  *
 141  * @return Returns 0 to indicate success. Otherwise an kerberos et
 142  * error code is returned, see krb5_get_error_message().
 143  *
 144  * @ingroup krb5
 145  */
 146
 147 krb5_error_code KRB5_LIB_FUNCTION
 148 krb5_copy_creds (krb5_context context,
 149                  const krb5_creds *incred,
 150                  krb5_creds **outcred)
 151 {
 152     krb5_creds *c;
 153
 154     c = malloc (sizeof (*c));
 155     if (c == NULL) {
 156         krb5_set_error_string (context, "malloc: out of memory");
 157         return ENOMEM;
 158     }
 159     memset (c, 0, sizeof(*c));
 160     *outcred = c;
 161     return krb5_copy_creds_contents (context, incred, c);
 162 }
 163
 164 /**
 165  * Free krb5_creds.
 166  *
 167  * @param context Kerberos 5 context.
 168  * @param c krb5_creds to free.
 169  *
 170  * @return Returns 0 to indicate success. Otherwise an kerberos et
 171  * error code is returned, see krb5_get_error_message().
 172  *
 173  * @ingroup krb5
 174  */
 175
 176 krb5_error_code KRB5_LIB_FUNCTION
 177 krb5_free_creds (krb5_context context, krb5_creds *c)
 178 {
 179     krb5_free_cred_contents (context, c);
 180     free (c);
 181     return 0;
 182 }
 183
 184 /* XXX this do not belong here */
 185 static krb5_boolean
 186 krb5_times_equal(const krb5_times *a, const krb5_times *b)
 187 {
 188     return a->starttime == b->starttime &&
 189         a->authtime == b->authtime &&
 190         a->endtime == b->endtime &&
 191         a->renew_till == b->renew_till;
 192 }
 193
 194 /**
 195  * Return TRUE if `mcreds' and `creds' are equal (`whichfields'
 196  * determines what equal means).
 197  *
 198  * @param context Kerberos 5 context.
 199  * @param whichfields which fields to compare.
 200  * @param mcreds cred to compare with.
 201  * @param creds cred to compare with.
 202  *
 203  * @return return TRUE if mcred and creds are equal, FALSE if not.
 204  *
 205  * @ingroup krb5
 206  */
 207
 208 krb5_boolean KRB5_LIB_FUNCTION
 209 krb5_compare_creds(krb5_context context, krb5_flags whichfields,
 210                    const krb5_creds * mcreds, const krb5_creds * creds)
 211 {
 212     krb5_boolean match = TRUE;
 213
 214     if (match && mcreds->server) {
 215         if (whichfields & (KRB5_TC_DONT_MATCH_REALM | KRB5_TC_MATCH_SRV_NAMEONLY))
 216             match = krb5_principal_compare_any_realm (context, mcreds->server,
 217                                                       creds->server);
 218         else
 219             match = krb5_principal_compare (context, mcreds->server,
 220                                             creds->server);
 221     }
 222
 223     if (match && mcreds->client) {
 224         if(whichfields & KRB5_TC_DONT_MATCH_REALM)
 225             match = krb5_principal_compare_any_realm (context, mcreds->client,
 226                                                       creds->client);
 227         else
 228             match = krb5_principal_compare (context, mcreds->client,
 229                                             creds->client);
 230     }
 231
 232     if (match && (whichfields & KRB5_TC_MATCH_KEYTYPE))
 233         match = krb5_enctypes_compatible_keys(context,
 234                                               mcreds->session.keytype,
 235                                               creds->session.keytype);
 236
 237     if (match && (whichfields & KRB5_TC_MATCH_FLAGS_EXACT))
 238         match = mcreds->flags.i == creds->flags.i;
 239
 240     if (match && (whichfields & KRB5_TC_MATCH_FLAGS))
 241         match = (creds->flags.i & mcreds->flags.i) == mcreds->flags.i;
 242
 243     if (match && (whichfields & KRB5_TC_MATCH_TIMES_EXACT))
 244         match = krb5_times_equal(&mcreds->times, &creds->times);
 245
 246     if (match && (whichfields & KRB5_TC_MATCH_TIMES))
 247         /* compare only expiration times */
 248         match = (mcreds->times.renew_till <= creds->times.renew_till) &&
 249             (mcreds->times.endtime <= creds->times.endtime);
 250
 251     if (match && (whichfields & KRB5_TC_MATCH_AUTHDATA)) {
 252         unsigned int i;
 253         if(mcreds->authdata.len != creds->authdata.len)
 254             match = FALSE;
 255         else
 256             for(i = 0; match && i < mcreds->authdata.len; i++)
 257                 match = (mcreds->authdata.val[i].ad_type ==
 258                          creds->authdata.val[i].ad_type) &&
 259                     (krb5_data_cmp(&mcreds->authdata.val[i].ad_data,
 260                                    &creds->authdata.val[i].ad_data) == 0);
 261     }
 262     if (match && (whichfields & KRB5_TC_MATCH_2ND_TKT))
 263         match = (krb5_data_cmp(&mcreds->second_ticket, &creds->second_ticket) == 0);
 264
 265     if (match && (whichfields & KRB5_TC_MATCH_IS_SKEY))
 266         match = ((mcreds->second_ticket.length == 0) ==
 267                  (creds->second_ticket.length == 0));
 268
 269     return match;
 270 }