1 /* 2 * Copyright (c) 1997 - 2000 Kungliga Tekniska H�gskolan 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: rd_priv.c,v 1.23 2000/02/06 05:20:13 assar Exp $"); 37 38 krb5_error_code 39 krb5_rd_priv(krb5_context context, 40 krb5_auth_context auth_context, 41 const krb5_data *inbuf, 42 krb5_data *outbuf, 43 /*krb5_replay_data*/ void *outdata) 44 { 45 krb5_error_code ret; 46 KRB_PRIV priv; 47 EncKrbPrivPart part; 48 size_t len; 49 krb5_data plain; 50 krb5_keyblock *key; 51 krb5_crypto crypto; 52 53 memset(&priv, 0, sizeof(priv)); 54 ret = decode_KRB_PRIV (inbuf->data, inbuf->length, &priv, &len); 55 if (ret) 56 goto failure; 57 if (priv.pvno != 5) { 58 ret = KRB5KRB_AP_ERR_BADVERSION; 59 goto failure; 60 } 61 if (priv.msg_type != krb_priv) { 62 ret = KRB5KRB_AP_ERR_MSG_TYPE; 63 goto failure; 64 } 65 66 /* XXX - Is this right? */ 67 68 if (auth_context->local_subkey) 69 key = auth_context->local_subkey; 70 else if (auth_context->remote_subkey) 71 key = auth_context->remote_subkey; 72 else 73 key = auth_context->keyblock; 74 75 krb5_crypto_init(context, key, 0, &crypto); 76 ret = krb5_decrypt_EncryptedData(context, 77 crypto, 78 KRB5_KU_KRB_PRIV, 79 &priv.enc_part, 80 &plain); 81 krb5_crypto_destroy(context, crypto); 82 if (ret) 83 goto failure; 84 85 ret = decode_EncKrbPrivPart (plain.data, plain.length, &part, &len); 86 krb5_data_free (&plain); 87 if (ret) 88 goto failure; 89 90 /* check sender address */ 91 92 if (part.s_address 93 && auth_context->remote_address 94 && !krb5_address_compare (context, 95 auth_context->remote_address, 96 part.s_address)) { 97 ret = KRB5KRB_AP_ERR_BADADDR; 98 goto failure_part; 99 } 100 101 /* check receiver address */ 102 103 if (part.r_address 104 && auth_context->local_address 105 && !krb5_address_compare (context, 106 auth_context->local_address, 107 part.r_address)) { 108 ret = KRB5KRB_AP_ERR_BADADDR; 109 goto failure_part; 110 } 111 112 /* check timestamp */ 113 if (auth_context->flags & KRB5_AUTH_CONTEXT_DO_TIME) { 114 krb5_timestamp sec; 115 116 krb5_timeofday (context, &sec); 117 if (part.timestamp == NULL || 118 part.usec == NULL || 119 abs(*part.timestamp - sec) > context->max_skew) { 120 ret = KRB5KRB_AP_ERR_SKEW; 121 goto failure_part; 122 } 123 } 124 125 /* XXX - check replay cache */ 126 127 /* check sequence number */ 128 if (auth_context->flags & KRB5_AUTH_CONTEXT_DO_SEQUENCE) { 129 if (part.seq_number == NULL || 130 *part.seq_number != ++auth_context->remote_seqnumber) { 131 ret = KRB5KRB_AP_ERR_BADORDER; 132 goto failure_part; 133 } 134 } 135 136 ret = krb5_data_copy (outbuf, part.user_data.data, part.user_data.length); 137 if (ret) 138 goto failure_part; 139 140 free_EncKrbPrivPart (&part); 141 free_KRB_PRIV (&priv); 142 return 0; 143 144 failure_part: 145 free_EncKrbPrivPart (&part); 146 147 failure: 148 free_KRB_PRIV (&priv); 149 return ret; 150 } 151