517 lines
12 KiB
C
517 lines
12 KiB
C
/*
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* Copyright (c) 1997 - 2000 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: rd_req.c,v 1.44 2000/11/15 23:16:28 assar Exp $");
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static krb5_error_code
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decrypt_tkt_enc_part (krb5_context context,
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krb5_keyblock *key,
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EncryptedData *enc_part,
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EncTicketPart *decr_part)
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{
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krb5_error_code ret;
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krb5_data plain;
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size_t len;
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krb5_crypto crypto;
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ret = krb5_crypto_init(context, key, 0, &crypto);
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if (ret)
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return ret;
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ret = krb5_decrypt_EncryptedData (context,
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crypto,
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KRB5_KU_TICKET,
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enc_part,
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&plain);
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krb5_crypto_destroy(context, crypto);
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if (ret)
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return ret;
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ret = krb5_decode_EncTicketPart(context, plain.data, plain.length,
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decr_part, &len);
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krb5_data_free (&plain);
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return ret;
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}
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static krb5_error_code
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decrypt_authenticator (krb5_context context,
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EncryptionKey *key,
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EncryptedData *enc_part,
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Authenticator *authenticator,
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krb5_key_usage usage)
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{
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krb5_error_code ret;
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krb5_data plain;
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size_t len;
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krb5_crypto crypto;
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ret = krb5_crypto_init(context, key, 0, &crypto);
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if (ret)
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return ret;
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ret = krb5_decrypt_EncryptedData (context,
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crypto,
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usage /* KRB5_KU_AP_REQ_AUTH */,
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enc_part,
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&plain);
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/* for backwards compatibility, also try the old usage */
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if (ret && usage == KRB5_KU_TGS_REQ_AUTH)
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ret = krb5_decrypt_EncryptedData (context,
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crypto,
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KRB5_KU_AP_REQ_AUTH,
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enc_part,
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&plain);
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krb5_crypto_destroy(context, crypto);
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if (ret)
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return ret;
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ret = krb5_decode_Authenticator(context, plain.data, plain.length,
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authenticator, &len);
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krb5_data_free (&plain);
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return ret;
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}
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krb5_error_code
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krb5_decode_ap_req(krb5_context context,
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const krb5_data *inbuf,
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krb5_ap_req *ap_req)
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{
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krb5_error_code ret;
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size_t len;
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ret = decode_AP_REQ(inbuf->data, inbuf->length, ap_req, &len);
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if (ret)
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return ret;
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if (ap_req->pvno != 5){
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free_AP_REQ(ap_req);
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return KRB5KRB_AP_ERR_BADVERSION;
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}
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if (ap_req->msg_type != krb_ap_req){
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free_AP_REQ(ap_req);
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return KRB5KRB_AP_ERR_MSG_TYPE;
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}
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if (ap_req->ticket.tkt_vno != 5){
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free_AP_REQ(ap_req);
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return KRB5KRB_AP_ERR_BADVERSION;
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}
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return 0;
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}
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krb5_error_code
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krb5_decrypt_ticket(krb5_context context,
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Ticket *ticket,
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krb5_keyblock *key,
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EncTicketPart *out,
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krb5_flags flags)
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{
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EncTicketPart t;
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krb5_error_code ret;
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ret = decrypt_tkt_enc_part (context, key, &ticket->enc_part, &t);
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if (ret)
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return ret;
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{
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krb5_timestamp now;
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time_t start = t.authtime;
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krb5_timeofday (context, &now);
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if(t.starttime)
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start = *t.starttime;
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if(start - now > context->max_skew
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|| (t.flags.invalid
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&& !(flags & KRB5_VERIFY_AP_REQ_IGNORE_INVALID))) {
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free_EncTicketPart(&t);
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return KRB5KRB_AP_ERR_TKT_NYV;
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}
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if(now - t.endtime > context->max_skew) {
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free_EncTicketPart(&t);
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return KRB5KRB_AP_ERR_TKT_EXPIRED;
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}
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}
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if(out)
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*out = t;
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else
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free_EncTicketPart(&t);
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return 0;
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}
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krb5_error_code
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krb5_verify_authenticator_checksum(krb5_context context,
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krb5_auth_context ac,
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void *data,
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size_t len)
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{
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krb5_error_code ret;
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krb5_keyblock *key;
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krb5_authenticator authenticator;
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krb5_crypto crypto;
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ret = krb5_auth_getauthenticator (context,
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ac,
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&authenticator);
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if(ret)
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return ret;
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if(authenticator->cksum == NULL)
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return -17;
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ret = krb5_auth_con_getkey(context, ac, &key);
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if(ret) {
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krb5_free_authenticator(context, &authenticator);
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return ret;
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}
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ret = krb5_crypto_init(context, key, 0, &crypto);
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if(ret)
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goto out;
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ret = krb5_verify_checksum (context,
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crypto,
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KRB5_KU_AP_REQ_AUTH_CKSUM,
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data,
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len,
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authenticator->cksum);
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krb5_crypto_destroy(context, crypto);
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out:
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krb5_free_authenticator(context, &authenticator);
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krb5_free_keyblock(context, key);
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return ret;
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}
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#if 0
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static krb5_error_code
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check_transited(krb5_context context,
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krb5_ticket *ticket)
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{
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char **realms;
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int num_realms;
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krb5_error_code ret;
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if(ticket->ticket.transited.tr_type != DOMAIN_X500_COMPRESS)
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return KRB5KDC_ERR_TRTYPE_NOSUPP;
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ret = krb5_domain_x500_decode(ticket->ticket.transited.contents,
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&realms, &num_realms,
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ticket->client->realm,
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ticket->server->realm);
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if(ret)
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return ret;
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ret = krb5_check_transited_realms(context, realms, num_realms, NULL);
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free(realms);
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return ret;
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}
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#endif
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krb5_error_code
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krb5_verify_ap_req(krb5_context context,
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krb5_auth_context *auth_context,
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krb5_ap_req *ap_req,
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krb5_const_principal server,
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krb5_keyblock *keyblock,
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krb5_flags flags,
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krb5_flags *ap_req_options,
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krb5_ticket **ticket)
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{
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return krb5_verify_ap_req2 (context,
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auth_context,
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ap_req,
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server,
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keyblock,
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flags,
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ap_req_options,
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ticket,
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KRB5_KU_AP_REQ_AUTH);
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}
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krb5_error_code
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krb5_verify_ap_req2(krb5_context context,
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krb5_auth_context *auth_context,
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krb5_ap_req *ap_req,
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krb5_const_principal server,
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krb5_keyblock *keyblock,
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krb5_flags flags,
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krb5_flags *ap_req_options,
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krb5_ticket **ticket,
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krb5_key_usage usage)
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{
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krb5_ticket t;
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krb5_auth_context ac;
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krb5_error_code ret;
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if (auth_context && *auth_context) {
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ac = *auth_context;
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} else {
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ret = krb5_auth_con_init (context, &ac);
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if (ret)
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return ret;
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}
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if (ap_req->ap_options.use_session_key && ac->keyblock){
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ret = krb5_decrypt_ticket(context, &ap_req->ticket,
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ac->keyblock,
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&t.ticket,
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flags);
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krb5_free_keyblock(context, ac->keyblock);
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ac->keyblock = NULL;
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}else
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ret = krb5_decrypt_ticket(context, &ap_req->ticket,
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keyblock,
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&t.ticket,
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flags);
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if(ret)
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goto out;
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principalname2krb5_principal(&t.server, ap_req->ticket.sname,
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ap_req->ticket.realm);
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principalname2krb5_principal(&t.client, t.ticket.cname,
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t.ticket.crealm);
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/* save key */
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krb5_copy_keyblock(context, &t.ticket.key, &ac->keyblock);
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ret = decrypt_authenticator (context,
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&t.ticket.key,
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&ap_req->authenticator,
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ac->authenticator,
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usage);
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if (ret)
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goto out2;
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{
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krb5_principal p1, p2;
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krb5_boolean res;
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principalname2krb5_principal(&p1,
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ac->authenticator->cname,
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ac->authenticator->crealm);
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principalname2krb5_principal(&p2,
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t.ticket.cname,
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t.ticket.crealm);
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res = krb5_principal_compare (context, p1, p2);
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krb5_free_principal (context, p1);
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krb5_free_principal (context, p2);
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if (!res) {
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ret = KRB5KRB_AP_ERR_BADMATCH;
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goto out2;
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}
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}
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/* check addresses */
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if (t.ticket.caddr
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&& ac->remote_address
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&& !krb5_address_search (context,
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ac->remote_address,
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t.ticket.caddr)) {
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ret = KRB5KRB_AP_ERR_BADADDR;
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goto out2;
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}
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if (ac->authenticator->seq_number)
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ac->remote_seqnumber = *ac->authenticator->seq_number;
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/* XXX - Xor sequence numbers */
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/* XXX - subkeys? */
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/* And where should it be stored? */
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if (ac->authenticator->subkey) {
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krb5_copy_keyblock(context,
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ac->authenticator->subkey,
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&ac->remote_subkey);
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}
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if (ap_req_options) {
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*ap_req_options = 0;
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if (ap_req->ap_options.use_session_key)
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*ap_req_options |= AP_OPTS_USE_SESSION_KEY;
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if (ap_req->ap_options.mutual_required)
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*ap_req_options |= AP_OPTS_MUTUAL_REQUIRED;
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}
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if(ticket){
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*ticket = malloc(sizeof(**ticket));
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**ticket = t;
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} else
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krb5_free_ticket (context, &t);
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if (auth_context) {
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if (*auth_context == NULL)
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*auth_context = ac;
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} else
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krb5_auth_con_free (context, ac);
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return 0;
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out2:
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krb5_free_ticket (context, &t);
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out:
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if (auth_context == NULL || *auth_context == NULL)
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krb5_auth_con_free (context, ac);
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return ret;
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}
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krb5_error_code
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krb5_rd_req_with_keyblock(krb5_context context,
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krb5_auth_context *auth_context,
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const krb5_data *inbuf,
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krb5_const_principal server,
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krb5_keyblock *keyblock,
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krb5_flags *ap_req_options,
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krb5_ticket **ticket)
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{
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krb5_error_code ret;
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krb5_ap_req ap_req;
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if (*auth_context == NULL) {
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ret = krb5_auth_con_init(context, auth_context);
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if (ret)
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return ret;
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}
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ret = krb5_decode_ap_req(context, inbuf, &ap_req);
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if(ret)
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return ret;
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ret = krb5_verify_ap_req(context,
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auth_context,
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&ap_req,
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server,
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keyblock,
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0,
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ap_req_options,
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ticket);
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free_AP_REQ(&ap_req);
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return ret;
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}
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static krb5_error_code
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get_key_from_keytab(krb5_context context,
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krb5_auth_context *auth_context,
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krb5_ap_req *ap_req,
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krb5_const_principal server,
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krb5_keytab keytab,
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krb5_keyblock **out_key)
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{
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krb5_keytab_entry entry;
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krb5_error_code ret;
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int kvno;
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krb5_keytab real_keytab;
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if(keytab == NULL)
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krb5_kt_default(context, &real_keytab);
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else
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real_keytab = keytab;
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if (ap_req->ticket.enc_part.kvno)
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kvno = *ap_req->ticket.enc_part.kvno;
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else
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kvno = 0;
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ret = krb5_kt_get_entry (context,
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real_keytab,
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server,
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kvno,
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ap_req->ticket.enc_part.etype,
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&entry);
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if(ret)
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goto out;
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ret = krb5_copy_keyblock(context, &entry.keyblock, out_key);
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krb5_kt_free_entry (context, &entry);
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out:
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if(keytab == NULL)
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krb5_kt_close(context, real_keytab);
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return ret;
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}
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krb5_error_code
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krb5_rd_req(krb5_context context,
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krb5_auth_context *auth_context,
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const krb5_data *inbuf,
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krb5_const_principal server,
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krb5_keytab keytab,
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krb5_flags *ap_req_options,
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krb5_ticket **ticket)
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{
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krb5_error_code ret;
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krb5_ap_req ap_req;
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krb5_keyblock *keyblock = NULL;
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krb5_principal service = NULL;
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if (*auth_context == NULL) {
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ret = krb5_auth_con_init(context, auth_context);
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if (ret)
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return ret;
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}
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ret = krb5_decode_ap_req(context, inbuf, &ap_req);
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if(ret)
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return ret;
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if(server == NULL){
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principalname2krb5_principal(&service,
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ap_req.ticket.sname,
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ap_req.ticket.realm);
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server = service;
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}
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if(ap_req.ap_options.use_session_key == 0 ||
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(*auth_context)->keyblock == NULL){
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ret = get_key_from_keytab(context,
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auth_context,
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&ap_req,
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server,
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keytab,
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&keyblock);
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if(ret)
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goto out;
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}
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ret = krb5_verify_ap_req(context,
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auth_context,
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&ap_req,
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server,
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keyblock,
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0,
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ap_req_options,
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ticket);
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if(keyblock != NULL)
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krb5_free_keyblock(context, keyblock);
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out:
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free_AP_REQ(&ap_req);
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if(service)
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krb5_free_principal(context, service);
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return ret;
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}
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