1 /* 2 * Copyright (c) 1997 - 2002 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 1.28.4.1 2004/03/07 12:46:43 lha 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 krb5_keyblock *key; 56 57 if (auth_context->local_subkey) 58 key = auth_context->local_subkey; 59 else if (auth_context->remote_subkey) 60 key = auth_context->remote_subkey; 61 else 62 key = auth_context->keyblock; 63 64 s.pvno = 5; 65 s.msg_type = krb_safe; 66 67 s.safe_body.user_data = *userdata; 68 krb5_us_timeofday (context, &sec, &usec); 69 70 sec2 = sec; 71 s.safe_body.timestamp = &sec2; 72 usec2 = usec; 73 s.safe_body.usec = &usec2; 74 if (auth_context->flags & KRB5_AUTH_CONTEXT_DO_SEQUENCE) { 75 tmp_seq = auth_context->local_seqnumber; 76 s.safe_body.seq_number = &tmp_seq; 77 } else 78 s.safe_body.seq_number = NULL; 79 80 s.safe_body.s_address = auth_context->local_address; 81 s.safe_body.r_address = auth_context->remote_address; 82 83 s.cksum.cksumtype = 0; 84 s.cksum.checksum.data = NULL; 85 s.cksum.checksum.length = 0; 86 87 ASN1_MALLOC_ENCODE(KRB_SAFE, buf, buf_size, &s, &len, ret); 88 if (ret) 89 return ret; 90 if(buf_size != len) 91 krb5_abortx(context, "internal error in ASN.1 encoder"); 92 ret = krb5_crypto_init(context, key, 0, &crypto); 93 if (ret) { 94 free (buf); 95 return ret; 96 } 97 ret = krb5_create_checksum(context, 98 crypto, 99 KRB5_KU_KRB_SAFE_CKSUM, 100 0, 101 buf, 102 len, 103 &s.cksum); 104 krb5_crypto_destroy(context, crypto); 105 if (ret) { 106 free (buf); 107 return ret; 108 } 109 110 free(buf); 111 ASN1_MALLOC_ENCODE(KRB_SAFE, buf, buf_size, &s, &len, ret); 112 free_Checksum (&s.cksum); 113 if(ret) 114 return ret; 115 if(buf_size != len) 116 krb5_abortx(context, "internal error in ASN.1 encoder"); 117 118 outbuf->length = len; 119 outbuf->data = buf; 120 if (auth_context->flags & KRB5_AUTH_CONTEXT_DO_SEQUENCE) 121 auth_context->local_seqnumber = 122 (auth_context->local_seqnumber + 1) & 0xFFFFFFFF; 123 return 0; 124 } 125