1 /* 2 * Copyright (c) 1997 - 2001 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 1.29 2001/05/14 06:14:49 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 krb5_set_error_string (context, "malloc: out of memory"); 92 return ENOMEM; 93 } 94 95 krb5_data_zero (&s.enc_part.cipher); 96 97 do { 98 ret = encode_EncKrbPrivPart (buf + buf_size - 1, buf_size, 99 &part, &len); 100 if (ret) { 101 if (ret == ASN1_OVERFLOW) { 102 u_char *tmp; 103 104 buf_size *= 2; 105 tmp = realloc (buf, buf_size); 106 if (tmp == NULL) { 107 krb5_set_error_string (context, "malloc: out of memory"); 108 ret = ENOMEM; 109 goto fail; 110 } 111 buf = tmp; 112 } else { 113 goto fail; 114 } 115 } 116 } while(ret == ASN1_OVERFLOW); 117 118 s.pvno = 5; 119 s.msg_type = krb_priv; 120 s.enc_part.etype = key->keytype; 121 s.enc_part.kvno = NULL; 122 123 ret = krb5_crypto_init(context, key, 0, &crypto); 124 if (ret) { 125 free (buf); 126 return ret; 127 } 128 ret = krb5_encrypt (context, 129 crypto, 130 KRB5_KU_KRB_PRIV, 131 buf + buf_size - len, 132 len, 133 &s.enc_part.cipher); 134 krb5_crypto_destroy(context, crypto); 135 if (ret) { 136 free(buf); 137 return ret; 138 } 139 140 do { 141 ret = encode_KRB_PRIV (buf + buf_size - 1, buf_size, &s, &len); 142 143 if (ret){ 144 if (ret == ASN1_OVERFLOW) { 145 u_char *tmp; 146 147 buf_size *= 2; 148 tmp = realloc (buf, buf_size); 149 if (tmp == NULL) { 150 krb5_set_error_string (context, "malloc: out of memory"); 151 ret = ENOMEM; 152 goto fail; 153 } 154 buf = tmp; 155 } else { 156 goto fail; 157 } 158 } 159 } while(ret == ASN1_OVERFLOW); 160 krb5_data_free (&s.enc_part.cipher); 161 162 outbuf->length = len; 163 outbuf->data = malloc (len); 164 if (outbuf->data == NULL) { 165 krb5_set_error_string (context, "malloc: out of memory"); 166 free(buf); 167 return ENOMEM; 168 } 169 memcpy (outbuf->data, buf + buf_size - len, len); 170 free (buf); 171 if (auth_context->flags & KRB5_AUTH_CONTEXT_DO_SEQUENCE) 172 auth_context->local_seqnumber = 173 (auth_context->local_seqnumber + 1) & 0xFFFFFFFF; 174 return 0; 175 176 fail: 177 free (buf); 178 krb5_data_free (&s.enc_part.cipher); 179 return ret; 180 } 181