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: mk_safe.c,v 1.24 2000/08/18 06:48:40 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 size_t buf_size; 52 size_t len; 53 u_int32_t tmp_seq; 54 krb5_crypto crypto; 55 56 s.pvno = 5; 57 s.msg_type = krb_safe; 58 59 s.safe_body.user_data = *userdata; 60 krb5_us_timeofday (context, &sec, &usec); 61 62 sec2 = sec; 63 s.safe_body.timestamp = &sec2; 64 usec2 = usec2; 65 s.safe_body.usec = &usec2; 66 if (auth_context->flags & KRB5_AUTH_CONTEXT_DO_SEQUENCE) { 67 tmp_seq = auth_context->local_seqnumber; 68 s.safe_body.seq_number = &tmp_seq; 69 } else 70 s.safe_body.seq_number = NULL; 71 72 s.safe_body.s_address = auth_context->local_address; 73 s.safe_body.r_address = auth_context->remote_address; 74 75 s.cksum.cksumtype = 0; 76 s.cksum.checksum.data = NULL; 77 s.cksum.checksum.length = 0; 78 79 buf_size = length_KRB_SAFE(&s); 80 buf = malloc(buf_size + 128); /* add some for checksum */ 81 if(buf == NULL) 82 return ENOMEM; 83 ret = encode_KRB_SAFE (buf + buf_size - 1, buf_size, &s, &len); 84 if (ret) { 85 free (buf); 86 return ret; 87 } 88 ret = krb5_crypto_init(context, auth_context->keyblock, 0, &crypto); 89 if (ret) { 90 free (buf); 91 return ret; 92 } 93 ret = krb5_create_checksum(context, 94 crypto, 95 KRB5_KU_KRB_SAFE_CKSUM, 96 buf + buf_size - len, 97 len, 98 &s.cksum); 99 krb5_crypto_destroy(context, crypto); 100 if (ret) { 101 free (buf); 102 return ret; 103 } 104 105 buf_size = length_KRB_SAFE(&s); 106 buf = realloc(buf, buf_size); 107 if(buf == NULL) 108 return ENOMEM; 109 110 ret = encode_KRB_SAFE (buf + buf_size - 1, buf_size, &s, &len); 111 free_Checksum (&s.cksum); 112 113 outbuf->length = len; 114 outbuf->data = malloc (len); 115 if (outbuf->data == NULL) { 116 free (buf); 117 return ENOMEM; 118 } 119 memcpy (outbuf->data, buf + buf_size - len, len); 120 free (buf); 121 if (auth_context->flags & KRB5_AUTH_CONTEXT_DO_SEQUENCE) 122 auth_context->local_seqnumber = 123 (auth_context->local_seqnumber + 1) & 0xFFFFFFFF; 124 return 0; 125 } 126