1 /* 2 * Copyright (c) 1997 - 2001 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 1.27 2001/01/19 04:27:09 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 ret = krb5_crypto_init(context, key, 0, &crypto); 76 if (ret) 77 goto failure; 78 ret = krb5_decrypt_EncryptedData(context, 79 crypto, 80 KRB5_KU_KRB_PRIV, 81 &priv.enc_part, 82 &plain); 83 krb5_crypto_destroy(context, crypto); 84 if (ret) 85 goto failure; 86 87 ret = decode_EncKrbPrivPart (plain.data, plain.length, &part, &len); 88 krb5_data_free (&plain); 89 if (ret) 90 goto failure; 91 92 /* check sender address */ 93 94 if (part.s_address 95 && auth_context->remote_address 96 && !krb5_address_compare (context, 97 auth_context->remote_address, 98 part.s_address)) { 99 ret = KRB5KRB_AP_ERR_BADADDR; 100 goto failure_part; 101 } 102 103 /* check receiver address */ 104 105 if (part.r_address 106 && auth_context->local_address 107 && !krb5_address_compare (context, 108 auth_context->local_address, 109 part.r_address)) { 110 ret = KRB5KRB_AP_ERR_BADADDR; 111 goto failure_part; 112 } 113 114 /* check timestamp */ 115 if (auth_context->flags & KRB5_AUTH_CONTEXT_DO_TIME) { 116 krb5_timestamp sec; 117 118 krb5_timeofday (context, &sec); 119 if (part.timestamp == NULL || 120 part.usec == NULL || 121 abs(*part.timestamp - sec) > context->max_skew) { 122 ret = KRB5KRB_AP_ERR_SKEW; 123 goto failure_part; 124 } 125 } 126 127 /* XXX - check replay cache */ 128 129 /* check sequence number. since MIT krb5 cannot generate a sequence 130 number of zero but instead generates no sequence number, we accept that 131 */ 132 133 if (auth_context->flags & KRB5_AUTH_CONTEXT_DO_SEQUENCE) { 134 if ((part.seq_number == NULL 135 && auth_context->remote_seqnumber != 0) 136 || (part.seq_number != NULL 137 && *part.seq_number != auth_context->remote_seqnumber)) { 138 ret = KRB5KRB_AP_ERR_BADORDER; 139 goto failure_part; 140 } 141 auth_context->remote_seqnumber++; 142 } 143 144 ret = krb5_data_copy (outbuf, part.user_data.data, part.user_data.length); 145 if (ret) 146 goto failure_part; 147 148 free_EncKrbPrivPart (&part); 149 free_KRB_PRIV (&priv); 150 return 0; 151 152 failure_part: 153 free_EncKrbPrivPart (&part); 154 155 failure: 156 free_KRB_PRIV (&priv); 157 return ret; 158 } 159