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