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

   1 /*      $NetBSD: creds.c,v 1.1.1.2 2014/04/24 12:45:49 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 "krb5_locl.h"
  37
  38 /**
  39  * Free content of krb5_creds.
  40  *
  41  * @param context Kerberos 5 context.
  42  * @param c krb5_creds to free.
  43  *
  44  * @return Returns 0 to indicate success. Otherwise an kerberos et
  45  * error code is returned, see krb5_get_error_message().
  46  *
  47  * @ingroup krb5
  48  */
  49
  50 KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
  51 krb5_free_cred_contents (krb5_context context, krb5_creds *c)
  52 {
  53     krb5_free_principal (context, c->client);
  54     c->client = NULL;
  55     krb5_free_principal (context, c->server);
  56     c->server = NULL;
  57     krb5_free_keyblock_contents (context, &c->session);
  58     krb5_data_free (&c->ticket);
  59     krb5_data_free (&c->second_ticket);
  60     free_AuthorizationData (&c->authdata);
  61     krb5_free_addresses (context, &c->addresses);
  62     memset(c, 0, sizeof(*c));
  63     return 0;
  64 }
  65
  66 /**
  67  * Copy content of krb5_creds.
  68  *
  69  * @param context Kerberos 5 context.
  70  * @param incred source credential
  71  * @param c destination credential, free with krb5_free_cred_contents().
  72  *
  73  * @return Returns 0 to indicate success. Otherwise an kerberos et
  74  * error code is returned, see krb5_get_error_message().
  75  *
  76  * @ingroup krb5
  77  */
  78
  79 KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
  80 krb5_copy_creds_contents (krb5_context context,
  81                           const krb5_creds *incred,
  82                           krb5_creds *c)
  83 {
  84     krb5_error_code ret;
  85
  86     memset(c, 0, sizeof(*c));
  87     ret = krb5_copy_principal (context, incred->client, &c->client);
  88     if (ret)
  89         goto fail;
  90     ret = krb5_copy_principal (context, incred->server, &c->server);
  91     if (ret)
  92         goto fail;
  93     ret = krb5_copy_keyblock_contents (context, &incred->session, &c->session);
  94     if (ret)
  95         goto fail;
  96     c->times = incred->times;
  97     ret = krb5_data_copy (&c->ticket,
  98                           incred->ticket.data,
  99                           incred->ticket.length);
 100     if (ret)
 101         goto fail;
 102     ret = krb5_data_copy (&c->second_ticket,
 103                           incred->second_ticket.data,
 104                           incred->second_ticket.length);
 105     if (ret)
 106         goto fail;
 107     ret = copy_AuthorizationData(&incred->authdata, &c->authdata);
 108     if (ret)
 109         goto fail;
 110     ret = krb5_copy_addresses (context,
 111                                &incred->addresses,
 112                                &c->addresses);
 113     if (ret)
 114         goto fail;
 115     c->flags = incred->flags;
 116     return 0;
 117
 118 fail:
 119     krb5_free_cred_contents (context, c);
 120     return ret;
 121 }
 122
 123 /**
 124  * Copy krb5_creds.
 125  *
 126  * @param context Kerberos 5 context.
 127  * @param incred source credential
 128  * @param outcred destination credential, free with krb5_free_creds().
 129  *
 130  * @return Returns 0 to indicate success. Otherwise an kerberos et
 131  * error code is returned, see krb5_get_error_message().
 132  *
 133  * @ingroup krb5
 134  */
 135
 136 KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
 137 krb5_copy_creds (krb5_context context,
 138                  const krb5_creds *incred,
 139                  krb5_creds **outcred)
 140 {
 141     krb5_creds *c;
 142
 143     c = malloc (sizeof (*c));
 144     if (c == NULL) {
 145         krb5_set_error_message (context, ENOMEM,
 146                                 N_("malloc: out of memory", ""));
 147         return ENOMEM;
 148     }
 149     memset (c, 0, sizeof(*c));
 150     *outcred = c;
 151     return krb5_copy_creds_contents (context, incred, c);
 152 }
 153
 154 /**
 155  * Free krb5_creds.
 156  *
 157  * @param context Kerberos 5 context.
 158  * @param c krb5_creds to free.
 159  *
 160  * @return Returns 0 to indicate success. Otherwise an kerberos et
 161  * error code is returned, see krb5_get_error_message().
 162  *
 163  * @ingroup krb5
 164  */
 165
 166 KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
 167 krb5_free_creds (krb5_context context, krb5_creds *c)
 168 {
 169     krb5_free_cred_contents (context, c);
 170     free (c);
 171     return 0;
 172 }
 173
 174 /* XXX this do not belong here */
 175 static krb5_boolean
 176 krb5_times_equal(const krb5_times *a, const krb5_times *b)
 177 {
 178     return a->starttime == b->starttime &&
 179         a->authtime == b->authtime &&
 180         a->endtime == b->endtime &&
 181         a->renew_till == b->renew_till;
 182 }
 183
 184 /**
 185  * Return TRUE if `mcreds' and `creds' are equal (`whichfields'
 186  * determines what equal means).
 187  *
 188  *
 189  * The following flags, set in whichfields affects the comparison:
 190  * - KRB5_TC_MATCH_SRV_NAMEONLY Consider all realms equal when comparing the service principal.
 191  * - KRB5_TC_MATCH_KEYTYPE Compare enctypes.
 192  * - KRB5_TC_MATCH_FLAGS_EXACT Make sure that the ticket flags are identical.
 193  * - KRB5_TC_MATCH_FLAGS Make sure that all ticket flags set in mcreds are also present in creds .
 194  * - KRB5_TC_MATCH_TIMES_EXACT Compares the ticket times exactly.
 195  * - KRB5_TC_MATCH_TIMES Compares only the expiration times of the creds.
 196  * - KRB5_TC_MATCH_AUTHDATA Compares the authdata fields.
 197  * - KRB5_TC_MATCH_2ND_TKT Compares the second tickets (used by user-to-user authentication).
 198  * - KRB5_TC_MATCH_IS_SKEY Compares the existance of the second ticket.
 199  *
 200  * @param context Kerberos 5 context.
 201  * @param whichfields which fields to compare.
 202  * @param mcreds cred to compare with.
 203  * @param creds cred to compare with.
 204  *
 205  * @return return TRUE if mcred and creds are equal, FALSE if not.
 206  *
 207  * @ingroup krb5
 208  */
 209
 210 KRB5_LIB_FUNCTION krb5_boolean KRB5_LIB_CALL
 211 krb5_compare_creds(krb5_context context, krb5_flags whichfields,
 212                    const krb5_creds * mcreds, const krb5_creds * creds)
 213 {
 214     krb5_boolean match = TRUE;
 215
 216     if (match && mcreds->server) {
 217         if (whichfields & (KRB5_TC_DONT_MATCH_REALM | KRB5_TC_MATCH_SRV_NAMEONLY))
 218             match = krb5_principal_compare_any_realm (context, mcreds->server,
 219                                                       creds->server);
 220         else
 221             match = krb5_principal_compare (context, mcreds->server,
 222                                             creds->server);
 223     }
 224
 225     if (match && mcreds->client) {
 226         if(whichfields & KRB5_TC_DONT_MATCH_REALM)
 227             match = krb5_principal_compare_any_realm (context, mcreds->client,
 228                                                       creds->client);
 229         else
 230             match = krb5_principal_compare (context, mcreds->client,
 231                                             creds->client);
 232     }
 233
 234     if (match && (whichfields & KRB5_TC_MATCH_KEYTYPE))
 235         match = mcreds->session.keytype == 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 }
 271
 272 /**
 273  * Returns the ticket flags for the credentials in creds.
 274  * See also krb5_ticket_get_flags().
 275  *
 276  * @param creds credential to get ticket flags from
 277  *
 278  * @return ticket flags
 279  *
 280  * @ingroup krb5
 281  */
 282
 283 KRB5_LIB_FUNCTION unsigned long KRB5_LIB_CALL
 284 krb5_creds_get_ticket_flags(krb5_creds *creds)
 285 {
 286     return TicketFlags2int(creds->flags.b);
 287 }