f0bf8a5c1e
RFC1510 and RFC4120 say that you have to use the session key, Heimdal uses subkey. git-svn-id: svn://svn.h5l.se/heimdal/trunk/heimdal@16092 ec53bebd-3082-4978-b11e-865c3cabbd6b
332 lines
9.0 KiB
C
332 lines
9.0 KiB
C
/*
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* Copyright (c) 1997 - 2005 Kungliga Tekniska Högskolan
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* (Royal Institute of Technology, Stockholm, Sweden).
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* 3. Neither the name of the Institute nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <krb5_locl.h>
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RCSID("$Id$");
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static krb5_error_code
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compare_addrs(krb5_context context,
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krb5_address *a,
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krb5_address *b,
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const char *message)
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{
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char a_str[64], b_str[64];
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size_t len;
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if(krb5_address_compare (context, a, b))
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return 0;
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krb5_print_address (a, a_str, sizeof(a_str), &len);
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krb5_print_address (b, b_str, sizeof(b_str), &len);
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krb5_set_error_string(context, "%s: %s != %s", message, b_str, a_str);
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return KRB5KRB_AP_ERR_BADADDR;
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}
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krb5_error_code KRB5_LIB_FUNCTION
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krb5_rd_cred(krb5_context context,
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krb5_auth_context auth_context,
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krb5_data *in_data,
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krb5_creds ***ret_creds,
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krb5_replay_data *outdata)
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{
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krb5_error_code ret;
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size_t len;
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KRB_CRED cred;
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EncKrbCredPart enc_krb_cred_part;
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krb5_data enc_krb_cred_part_data;
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krb5_crypto crypto;
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int i;
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memset(&enc_krb_cred_part, 0, sizeof(enc_krb_cred_part));
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if ((auth_context->flags &
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(KRB5_AUTH_CONTEXT_RET_TIME | KRB5_AUTH_CONTEXT_RET_SEQUENCE)) &&
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outdata == NULL)
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return KRB5_RC_REQUIRED; /* XXX better error, MIT returns this */
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*ret_creds = NULL;
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ret = decode_KRB_CRED(in_data->data, in_data->length,
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&cred, &len);
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if(ret)
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return ret;
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if (cred.pvno != 5) {
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ret = KRB5KRB_AP_ERR_BADVERSION;
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krb5_clear_error_string (context);
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goto out;
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}
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if (cred.msg_type != krb_cred) {
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ret = KRB5KRB_AP_ERR_MSG_TYPE;
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krb5_clear_error_string (context);
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goto out;
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}
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if (cred.enc_part.etype == ETYPE_NULL) {
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/* DK: MIT GSS-API Compatibility */
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enc_krb_cred_part_data.length = cred.enc_part.cipher.length;
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enc_krb_cred_part_data.data = cred.enc_part.cipher.data;
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} else {
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/* Try both subkey and session key.
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*
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* RFC2140 claims we should use the session key, but Heimdal
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* before 0.8 used the remote subkey if it was send in the
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* auth_context.
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*/
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if (auth_context->remote_subkey) {
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ret = krb5_crypto_init(context, auth_context->remote_subkey,
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0, &crypto);
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if (ret)
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goto out;
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ret = krb5_decrypt_EncryptedData(context,
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crypto,
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KRB5_KU_KRB_CRED,
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&cred.enc_part,
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&enc_krb_cred_part_data);
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krb5_crypto_destroy(context, crypto);
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}
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/*
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* If there was not subkey, or we failed using subkey,
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* retry using the session key
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*/
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if (auth_context->remote_subkey == NULL || ret == KRB5KRB_AP_ERR_BAD_INTEGRITY)
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{
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ret = krb5_crypto_init(context, auth_context->keyblock,
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0, &crypto);
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if (ret)
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goto out;
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ret = krb5_decrypt_EncryptedData(context,
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crypto,
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KRB5_KU_KRB_CRED,
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&cred.enc_part,
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&enc_krb_cred_part_data);
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krb5_crypto_destroy(context, crypto);
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}
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if (ret)
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goto out;
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}
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ret = krb5_decode_EncKrbCredPart (context,
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enc_krb_cred_part_data.data,
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enc_krb_cred_part_data.length,
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&enc_krb_cred_part,
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&len);
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if (ret)
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goto out;
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/* check sender address */
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if (enc_krb_cred_part.s_address
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&& auth_context->remote_address
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&& auth_context->remote_port) {
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krb5_address *a;
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ret = krb5_make_addrport (context, &a,
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auth_context->remote_address,
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auth_context->remote_port);
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if (ret)
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goto out;
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ret = compare_addrs(context, a, enc_krb_cred_part.s_address,
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"sender address is wrong in received creds");
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krb5_free_address(context, a);
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free(a);
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if(ret)
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goto out;
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}
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/* check receiver address */
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if (enc_krb_cred_part.r_address
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&& auth_context->local_address) {
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if(auth_context->local_port &&
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enc_krb_cred_part.r_address->addr_type == KRB5_ADDRESS_ADDRPORT) {
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krb5_address *a;
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ret = krb5_make_addrport (context, &a,
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auth_context->local_address,
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auth_context->local_port);
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if (ret)
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goto out;
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ret = compare_addrs(context, a, enc_krb_cred_part.r_address,
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"receiver address is wrong in received creds");
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krb5_free_address(context, a);
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free(a);
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if(ret)
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goto out;
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} else {
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ret = compare_addrs(context, auth_context->local_address,
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enc_krb_cred_part.r_address,
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"receiver address is wrong in received creds");
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if(ret)
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goto out;
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}
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}
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/* check timestamp */
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if (auth_context->flags & KRB5_AUTH_CONTEXT_DO_TIME) {
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krb5_timestamp sec;
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krb5_timeofday (context, &sec);
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if (enc_krb_cred_part.timestamp == NULL ||
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enc_krb_cred_part.usec == NULL ||
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abs(*enc_krb_cred_part.timestamp - sec)
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> context->max_skew) {
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krb5_clear_error_string (context);
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ret = KRB5KRB_AP_ERR_SKEW;
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goto out;
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}
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}
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if ((auth_context->flags &
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(KRB5_AUTH_CONTEXT_RET_TIME | KRB5_AUTH_CONTEXT_RET_SEQUENCE))) {
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/* if these fields are not present in the cred-part, silently
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return zero */
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memset(outdata, 0, sizeof(*outdata));
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if(enc_krb_cred_part.timestamp)
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outdata->timestamp = *enc_krb_cred_part.timestamp;
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if(enc_krb_cred_part.usec)
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outdata->usec = *enc_krb_cred_part.usec;
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if(enc_krb_cred_part.nonce)
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outdata->seq = *enc_krb_cred_part.nonce;
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}
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/* Convert to NULL terminated list of creds */
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*ret_creds = calloc(enc_krb_cred_part.ticket_info.len + 1,
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sizeof(**ret_creds));
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if (*ret_creds == NULL) {
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ret = ENOMEM;
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krb5_set_error_string (context, "malloc: out of memory");
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goto out;
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}
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for (i = 0; i < enc_krb_cred_part.ticket_info.len; ++i) {
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KrbCredInfo *kci = &enc_krb_cred_part.ticket_info.val[i];
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krb5_creds *creds;
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creds = calloc(1, sizeof(*creds));
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if(creds == NULL) {
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ret = ENOMEM;
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krb5_set_error_string (context, "malloc: out of memory");
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goto out;
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}
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ASN1_MALLOC_ENCODE(Ticket, creds->ticket.data, creds->ticket.length,
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&cred.tickets.val[i], &len, ret);
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if (ret)
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goto out;
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if(creds->ticket.length != len)
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krb5_abortx(context, "internal error in ASN.1 encoder");
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copy_EncryptionKey (&kci->key, &creds->session);
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if (kci->prealm && kci->pname)
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_krb5_principalname2krb5_principal (&creds->client,
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*kci->pname,
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*kci->prealm);
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if (kci->flags)
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creds->flags.b = *kci->flags;
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if (kci->authtime)
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creds->times.authtime = *kci->authtime;
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if (kci->starttime)
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creds->times.starttime = *kci->starttime;
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if (kci->endtime)
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creds->times.endtime = *kci->endtime;
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if (kci->renew_till)
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creds->times.renew_till = *kci->renew_till;
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if (kci->srealm && kci->sname)
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_krb5_principalname2krb5_principal (&creds->server,
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*kci->sname,
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*kci->srealm);
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if (kci->caddr)
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krb5_copy_addresses (context,
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kci->caddr,
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&creds->addresses);
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(*ret_creds)[i] = creds;
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}
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(*ret_creds)[i] = NULL;
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free_KRB_CRED (&cred);
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free_EncKrbCredPart(&enc_krb_cred_part);
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return 0;
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out:
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free_EncKrbCredPart(&enc_krb_cred_part);
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free_KRB_CRED (&cred);
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if(*ret_creds) {
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for(i = 0; (*ret_creds)[i]; i++)
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krb5_free_creds(context, (*ret_creds)[i]);
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free(*ret_creds);
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}
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return ret;
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}
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krb5_error_code KRB5_LIB_FUNCTION
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krb5_rd_cred2 (krb5_context context,
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krb5_auth_context auth_context,
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krb5_ccache ccache,
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krb5_data *in_data)
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{
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krb5_error_code ret;
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krb5_creds **creds;
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int i;
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ret = krb5_rd_cred(context, auth_context, in_data, &creds, NULL);
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if(ret)
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return ret;
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/* Store the creds in the ccache */
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for(i = 0; creds && creds[i]; i++) {
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krb5_cc_store_cred(context, ccache, creds[i]);
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krb5_free_creds(context, creds[i]);
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}
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free(creds);
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return 0;
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}
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