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_priv.c,v 1.31 2002/09/04 16:26:04 joda Exp $"); 37 38 39 krb5_error_code 40 krb5_mk_priv(krb5_context context, 41 krb5_auth_context auth_context, 42 const krb5_data *userdata, 43 krb5_data *outbuf, 44 /*krb5_replay_data*/ void *outdata) 45 { 46 krb5_error_code ret; 47 KRB_PRIV s; 48 EncKrbPrivPart part; 49 u_char *buf; 50 size_t buf_size; 51 size_t len; 52 u_int32_t tmp_seq; 53 krb5_keyblock *key; 54 int32_t sec, usec; 55 KerberosTime sec2; 56 int usec2; 57 krb5_crypto crypto; 58 59 if (auth_context->local_subkey) 60 key = auth_context->local_subkey; 61 else if (auth_context->remote_subkey) 62 key = auth_context->remote_subkey; 63 else 64 key = auth_context->keyblock; 65 66 krb5_us_timeofday (context, &sec, &usec); 67 68 part.user_data = *userdata; 69 sec2 = sec; 70 part.timestamp = &sec2; 71 usec2 = usec; 72 part.usec = &usec2; 73 if (auth_context->flags & KRB5_AUTH_CONTEXT_DO_SEQUENCE) { 74 tmp_seq = auth_context->local_seqnumber; 75 part.seq_number = &tmp_seq; 76 } else { 77 part.seq_number = NULL; 78 } 79 80 part.s_address = auth_context->local_address; 81 part.r_address = auth_context->remote_address; 82 83 krb5_data_zero (&s.enc_part.cipher); 84 85 ASN1_MALLOC_ENCODE(EncKrbPrivPart, buf, buf_size, &part, &len, ret); 86 if (ret) 87 goto fail; 88 89 s.pvno = 5; 90 s.msg_type = krb_priv; 91 s.enc_part.etype = key->keytype; 92 s.enc_part.kvno = NULL; 93 94 ret = krb5_crypto_init(context, key, 0, &crypto); 95 if (ret) { 96 free (buf); 97 return ret; 98 } 99 ret = krb5_encrypt (context, 100 crypto, 101 KRB5_KU_KRB_PRIV, 102 buf + buf_size - len, 103 len, 104 &s.enc_part.cipher); 105 krb5_crypto_destroy(context, crypto); 106 if (ret) { 107 free(buf); 108 return ret; 109 } 110 free(buf); 111 112 113 ASN1_MALLOC_ENCODE(KRB_PRIV, buf, buf_size, &s, &len, ret); 114 115 if(ret) 116 goto fail; 117 krb5_data_free (&s.enc_part.cipher); 118 119 ret = krb5_data_copy(outbuf, buf + buf_size - len, len); 120 if (ret) { 121 krb5_set_error_string (context, "malloc: out of memory"); 122 free(buf); 123 return ENOMEM; 124 } 125 free (buf); 126 if (auth_context->flags & KRB5_AUTH_CONTEXT_DO_SEQUENCE) 127 auth_context->local_seqnumber = 128 (auth_context->local_seqnumber + 1) & 0xFFFFFFFF; 129 return 0; 130 131 fail: 132 free (buf); 133 krb5_data_free (&s.enc_part.cipher); 134 return ret; 135 } 136