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: mk_safe.c,v 1.27 2001/06/18 02:45:15 assar Exp $"); 37 38 krb5_error_code 39 krb5_mk_safe(krb5_context context, 40 krb5_auth_context auth_context, 41 const krb5_data *userdata, 42 krb5_data *outbuf, 43 /*krb5_replay_data*/ void *outdata) 44 { 45 krb5_error_code ret; 46 KRB_SAFE s; 47 int32_t sec, usec; 48 KerberosTime sec2; 49 int usec2; 50 u_char *buf = NULL; 51 void *tmp; 52 size_t buf_size; 53 size_t len; 54 u_int32_t tmp_seq; 55 krb5_crypto crypto; 56 krb5_keyblock *key; 57 58 if (auth_context->local_subkey) 59 key = auth_context->local_subkey; 60 else if (auth_context->remote_subkey) 61 key = auth_context->remote_subkey; 62 else 63 key = auth_context->keyblock; 64 65 s.pvno = 5; 66 s.msg_type = krb_safe; 67 68 s.safe_body.user_data = *userdata; 69 krb5_us_timeofday (context, &sec, &usec); 70 71 sec2 = sec; 72 s.safe_body.timestamp = &sec2; 73 usec2 = usec2; 74 s.safe_body.usec = &usec2; 75 if (auth_context->flags & KRB5_AUTH_CONTEXT_DO_SEQUENCE) { 76 tmp_seq = auth_context->local_seqnumber; 77 s.safe_body.seq_number = &tmp_seq; 78 } else 79 s.safe_body.seq_number = NULL; 80 81 s.safe_body.s_address = auth_context->local_address; 82 s.safe_body.r_address = auth_context->remote_address; 83 84 s.cksum.cksumtype = 0; 85 s.cksum.checksum.data = NULL; 86 s.cksum.checksum.length = 0; 87 88 buf_size = length_KRB_SAFE(&s); 89 buf = malloc(buf_size + 128); /* add some for checksum */ 90 if(buf == NULL) { 91 krb5_set_error_string (context, "malloc: out of memory"); 92 return ENOMEM; 93 } 94 ret = encode_KRB_SAFE (buf + buf_size - 1, buf_size, &s, &len); 95 if (ret) { 96 free (buf); 97 return ret; 98 } 99 ret = krb5_crypto_init(context, key, 0, &crypto); 100 if (ret) { 101 free (buf); 102 return ret; 103 } 104 ret = krb5_create_checksum(context, 105 crypto, 106 KRB5_KU_KRB_SAFE_CKSUM, 107 0, 108 buf + buf_size - len, 109 len, 110 &s.cksum); 111 krb5_crypto_destroy(context, crypto); 112 if (ret) { 113 free (buf); 114 return ret; 115 } 116 117 buf_size = length_KRB_SAFE(&s); 118 tmp = realloc(buf, buf_size); 119 if(tmp == NULL) { 120 free(buf); 121 krb5_set_error_string (context, "malloc: out of memory"); 122 return ENOMEM; 123 } 124 buf = tmp; 125 126 ret = encode_KRB_SAFE (buf + buf_size - 1, buf_size, &s, &len); 127 free_Checksum (&s.cksum); 128 129 outbuf->length = len; 130 outbuf->data = malloc (len); 131 if (outbuf->data == NULL) { 132 free (buf); 133 krb5_set_error_string (context, "malloc: out of memory"); 134 return ENOMEM; 135 } 136 memcpy (outbuf->data, buf + buf_size - len, len); 137 free (buf); 138 if (auth_context->flags & KRB5_AUTH_CONTEXT_DO_SEQUENCE) 139 auth_context->local_seqnumber = 140 (auth_context->local_seqnumber + 1) & 0xFFFFFFFF; 141 return 0; 142 } 143