1 /* 2 * Copyright (c) 1997, 1998, 1999 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 1.20 1999/12/02 17:05:11 joda 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 int 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 80 buf_size = length_KRB_SAFE(&s); 81 buf = malloc(buf_size + 128); /* add some for checksum */ 82 if(buf == NULL) 83 return ENOMEM; 84 ret = encode_KRB_SAFE (buf + buf_size - 1, buf_size, &s, &len); 85 ret = krb5_crypto_init(context, auth_context->keyblock, 0, &crypto); 86 ret = krb5_create_checksum(context, 87 crypto, 88 KRB5_KU_KRB_SAFE_CKSUM, 89 buf + buf_size - len, 90 len, 91 &s.cksum); 92 krb5_crypto_destroy(context, crypto); 93 if (ret) { 94 free (buf); 95 return ret; 96 } 97 98 buf_size = length_KRB_SAFE(&s); 99 buf = realloc(buf, buf_size); 100 if(buf == NULL) 101 return ENOMEM; 102 103 ret = encode_KRB_SAFE (buf + buf_size - 1, buf_size, &s, &len); 104 free_Checksum (&s.cksum); 105 106 outbuf->length = len; 107 outbuf->data = malloc (len); 108 if (outbuf->data == NULL) { 109 free (buf); 110 return ENOMEM; 111 } 112 memcpy (outbuf->data, buf + buf_size - len, len); 113 free (buf); 114 return 0; 115 } 116