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_priv.c,v 1.28 2000/08/18 06:48:07 assar Exp $"); 37 38 /* 39 * 40 */ 41 42 krb5_error_code 43 krb5_mk_priv(krb5_context context, 44 krb5_auth_context auth_context, 45 const krb5_data *userdata, 46 krb5_data *outbuf, 47 /*krb5_replay_data*/ void *outdata) 48 { 49 krb5_error_code ret; 50 KRB_PRIV s; 51 EncKrbPrivPart part; 52 u_char *buf; 53 size_t buf_size; 54 size_t len; 55 u_int32_t tmp_seq; 56 krb5_keyblock *key; 57 int32_t sec, usec; 58 KerberosTime sec2; 59 int usec2; 60 krb5_crypto crypto; 61 62 /* XXX - Is this right? */ 63 64 if (auth_context->local_subkey) 65 key = auth_context->local_subkey; 66 else if (auth_context->remote_subkey) 67 key = auth_context->remote_subkey; 68 else 69 key = auth_context->keyblock; 70 71 krb5_us_timeofday (context, &sec, &usec); 72 73 part.user_data = *userdata; 74 sec2 = sec; 75 part.timestamp = &sec2; 76 usec2 = usec; 77 part.usec = &usec2; 78 if (auth_context->flags & KRB5_AUTH_CONTEXT_DO_SEQUENCE) { 79 tmp_seq = auth_context->local_seqnumber; 80 part.seq_number = &tmp_seq; 81 } else { 82 part.seq_number = NULL; 83 } 84 85 part.s_address = auth_context->local_address; 86 part.r_address = auth_context->remote_address; 87 88 buf_size = 1024; 89 buf = malloc (buf_size); 90 if (buf == NULL) 91 return ENOMEM; 92 93 krb5_data_zero (&s.enc_part.cipher); 94 95 do { 96 ret = encode_EncKrbPrivPart (buf + buf_size - 1, buf_size, 97 &part, &len); 98 if (ret) { 99 if (ret == ASN1_OVERFLOW) { 100 u_char *tmp; 101 102 buf_size *= 2; 103 tmp = realloc (buf, buf_size); 104 if (tmp == NULL) { 105 ret = ENOMEM; 106 goto fail; 107 } 108 buf = tmp; 109 } else { 110 goto fail; 111 } 112 } 113 } while(ret == ASN1_OVERFLOW); 114 115 s.pvno = 5; 116 s.msg_type = krb_priv; 117 s.enc_part.etype = key->keytype; 118 s.enc_part.kvno = NULL; 119 120 ret = krb5_crypto_init(context, key, 0, &crypto); 121 if (ret) { 122 free (buf); 123 return ret; 124 } 125 ret = krb5_encrypt (context, 126 crypto, 127 KRB5_KU_KRB_PRIV, 128 buf + buf_size - len, 129 len, 130 &s.enc_part.cipher); 131 krb5_crypto_destroy(context, crypto); 132 if (ret) { 133 free(buf); 134 return ret; 135 } 136 137 do { 138 ret = encode_KRB_PRIV (buf + buf_size - 1, buf_size, &s, &len); 139 140 if (ret){ 141 if (ret == ASN1_OVERFLOW) { 142 u_char *tmp; 143 144 buf_size *= 2; 145 tmp = realloc (buf, buf_size); 146 if (tmp == NULL) { 147 ret = ENOMEM; 148 goto fail; 149 } 150 buf = tmp; 151 } else { 152 goto fail; 153 } 154 } 155 } while(ret == ASN1_OVERFLOW); 156 krb5_data_free (&s.enc_part.cipher); 157 158 outbuf->length = len; 159 outbuf->data = malloc (len); 160 if (outbuf->data == NULL) { 161 free(buf); 162 return ENOMEM; 163 } 164 memcpy (outbuf->data, buf + buf_size - len, len); 165 free (buf); 166 if (auth_context->flags & KRB5_AUTH_CONTEXT_DO_SEQUENCE) 167 auth_context->local_seqnumber = 168 (auth_context->local_seqnumber + 1) & 0xFFFFFFFF; 169 return 0; 170 171 fail: 172 free (buf); 173 krb5_data_free (&s.enc_part.cipher); 174 return ret; 175 } 176