lib/krb5/rd_cred.c

   1 /*
   2  * Copyright (c) 1997 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. All advertising materials mentioning features or use of this software
  18  *    must display the following acknowledgement:
  19  *      This product includes software developed by Kungliga Tekniska
  20  *      Högskolan and its contributors.
  21  *
  22  * 4. Neither the name of the Institute nor the names of its contributors
  23  *    may be used to endorse or promote products derived from this software
  24  *    without specific prior written permission.
  25  *
  26  * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
  27  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  28  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  29  * ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
  30  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  31  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  32  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  33  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  34  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  35  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  36  * SUCH DAMAGE.
  37  */
  38
  39 #include <krb5_locl.h>
  40
  41 RCSID("$Id$");
  42
  43 krb5_error_code
  44 krb5_rd_cred (krb5_context      context,
  45               krb5_auth_context auth_context,
  46               krb5_ccache       ccache,
  47               krb5_data         *in_data)
  48 {
  49     krb5_error_code ret;
  50     size_t len;
  51     KRB_CRED cred;
  52     EncKrbCredPart enc_krb_cred_part;
  53     krb5_data enc_krb_cred_part_data;
  54     int i;
  55
  56     ret = decode_KRB_CRED (in_data->data, in_data->length,
  57                            &cred, &len);
  58     if (ret)
  59         return ret;
  60
  61     if (cred.pvno != 5) {
  62         ret = KRB5KRB_AP_ERR_BADVERSION;
  63         goto out;
  64     }
  65
  66     if (cred.msg_type != krb_cred) {
  67         ret = KRB5KRB_AP_ERR_MSG_TYPE;
  68         goto out;
  69     }
  70
  71     ret = krb5_decrypt (context,
  72                         cred.enc_part.cipher.data,
  73                         cred.enc_part.cipher.length,
  74                         cred.enc_part.etype,
  75                         &auth_context->remote_subkey,
  76                         &enc_krb_cred_part_data);
  77     if (ret)
  78         goto out;
  79
  80
  81     ret = decode_EncKrbCredPart (enc_krb_cred_part_data.data,
  82                                  enc_krb_cred_part_data.length,
  83                                  &enc_krb_cred_part,
  84                                  &len);
  85     if (ret)
  86         goto out;
  87
  88     /* check sender address */
  89
  90     if (enc_krb_cred_part.s_address
  91         && auth_context->remote_address
  92         && !krb5_address_compare (context,
  93                                   auth_context->remote_address,
  94                                   enc_krb_cred_part.s_address)) {
  95         ret = KRB5KRB_AP_ERR_BADADDR;
  96         goto out;
  97     }
  98
  99     /* check receiver address */
 100
 101     if (enc_krb_cred_part.r_address
 102         && !krb5_address_compare (context,
 103                                   auth_context->local_address,
 104                                   enc_krb_cred_part.r_address)) {
 105         ret = KRB5KRB_AP_ERR_BADADDR;
 106         goto out;
 107     }
 108
 109     /* check timestamp */
 110     if (auth_context->flags & KRB5_AUTH_CONTEXT_DO_TIME) {
 111         int32_t sec;
 112
 113         krb5_timeofday (context, &sec);
 114
 115         if (enc_krb_cred_part.timestamp == NULL ||
 116             enc_krb_cred_part.usec      == NULL ||
 117             abs(*enc_krb_cred_part.timestamp - sec)
 118             > context->max_skew) {
 119             ret = KRB5KRB_AP_ERR_SKEW;
 120             goto out;
 121         }
 122     }
 123
 124     /* XXX - check replay cache */
 125
 126     /* Store the creds in the ccache */
 127
 128     for (i = 0; i < enc_krb_cred_part.ticket_info.len; ++i) {
 129         KrbCredInfo *kci = &enc_krb_cred_part.ticket_info.val[i];
 130         krb5_creds creds;
 131         u_char buf[1024];
 132         size_t len;
 133
 134         memset (&creds, 0, sizeof(creds));
 135
 136         ret = encode_Ticket (buf + sizeof(buf) - 1, sizeof(buf),
 137                              &cred.tickets.val[i],
 138                              &len);
 139         if (ret)
 140             goto out;
 141         krb5_data_copy (&creds.ticket, buf + sizeof(buf) - len, len);
 142         copy_EncryptionKey (&kci->key, &creds.session);
 143         if (kci->prealm && kci->pname)
 144             principalname2krb5_principal (&creds.client,
 145                                           *kci->pname,
 146                                           *kci->prealm);
 147         if (kci->flags)
 148             creds.flags.b = *kci->flags;
 149         if (kci->authtime)
 150             creds.times.authtime = *kci->authtime;
 151         if (kci->starttime)
 152             creds.times.starttime = *kci->starttime;
 153         if (kci->endtime)
 154             creds.times.endtime = *kci->endtime;
 155         if (kci->renew_till)
 156             creds.times.renew_till = *kci->renew_till;
 157         if (kci->srealm && kci->sname)
 158             principalname2krb5_principal (&creds.server,
 159                                           *kci->sname,
 160                                           *kci->srealm);
 161         if (kci->caddr)
 162             krb5_copy_addresses (context,
 163                                  kci->caddr,
 164                                  &creds.addresses);
 165         krb5_cc_store_cred (context, ccache, &creds);
 166     }
 167
 168 out:
 169     free_KRB_CRED (&cred);
 170     return ret;
 171 }