1 /* 2 * Copyright (c) 1997 - 2003 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 16680 2006-02-01 12:39:26Z lha $"); 37 38 39 krb5_error_code KRB5_LIB_FUNCTION 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 *outdata) 45 { 46 krb5_error_code ret; 47 KRB_PRIV s; 48 EncKrbPrivPart part; 49 u_char *buf = NULL; 50 size_t buf_size; 51 size_t len; 52 krb5_crypto crypto; 53 krb5_keyblock *key; 54 krb5_replay_data rdata; 55 56 if ((auth_context->flags & 57 (KRB5_AUTH_CONTEXT_RET_TIME | KRB5_AUTH_CONTEXT_RET_SEQUENCE)) && 58 outdata == NULL) 59 return KRB5_RC_REQUIRED; /* XXX better error, MIT returns this */ 60 61 if (auth_context->local_subkey) 62 key = auth_context->local_subkey; 63 else if (auth_context->remote_subkey) 64 key = auth_context->remote_subkey; 65 else 66 key = auth_context->keyblock; 67 68 memset(&rdata, 0, sizeof(rdata)); 69 70 part.user_data = *userdata; 71 72 krb5_us_timeofday (context, &rdata.timestamp, &rdata.usec); 73 74 if (auth_context->flags & KRB5_AUTH_CONTEXT_DO_TIME) { 75 part.timestamp = &rdata.timestamp; 76 part.usec = &rdata.usec; 77 } else { 78 part.timestamp = NULL; 79 part.usec = NULL; 80 } 81 82 if (auth_context->flags & KRB5_AUTH_CONTEXT_RET_TIME) { 83 outdata->timestamp = rdata.timestamp; 84 outdata->usec = rdata.usec; 85 } 86 87 if (auth_context->flags & KRB5_AUTH_CONTEXT_DO_SEQUENCE) { 88 rdata.seq = auth_context->local_seqnumber; 89 part.seq_number = &rdata.seq; 90 } else 91 part.seq_number = NULL; 92 93 if (auth_context->flags & KRB5_AUTH_CONTEXT_RET_SEQUENCE) 94 outdata->seq = auth_context->local_seqnumber; 95 96 part.s_address = auth_context->local_address; 97 part.r_address = auth_context->remote_address; 98 99 krb5_data_zero (&s.enc_part.cipher); 100 101 ASN1_MALLOC_ENCODE(EncKrbPrivPart, buf, buf_size, &part, &len, ret); 102 if (ret) 103 goto fail; 104 if (buf_size != len) 105 krb5_abortx(context, "internal error in ASN.1 encoder"); 106 107 s.pvno = 5; 108 s.msg_type = krb_priv; 109 s.enc_part.etype = key->keytype; 110 s.enc_part.kvno = NULL; 111 112 ret = krb5_crypto_init(context, key, 0, &crypto); 113 if (ret) { 114 free (buf); 115 return ret; 116 } 117 ret = krb5_encrypt (context, 118 crypto, 119 KRB5_KU_KRB_PRIV, 120 buf + buf_size - len, 121 len, 122 &s.enc_part.cipher); 123 krb5_crypto_destroy(context, crypto); 124 if (ret) { 125 free(buf); 126 return ret; 127 } 128 free(buf); 129 130 131 ASN1_MALLOC_ENCODE(KRB_PRIV, buf, buf_size, &s, &len, ret); 132 if (ret) 133 goto fail; 134 if (buf_size != len) 135 krb5_abortx(context, "internal error in ASN.1 encoder"); 136 137 krb5_data_free (&s.enc_part.cipher); 138 139 ret = krb5_data_copy(outbuf, buf + buf_size - len, len); 140 if (ret) { 141 krb5_set_error_string (context, "malloc: out of memory"); 142 free(buf); 143 return ENOMEM; 144 } 145 free (buf); 146 if (auth_context->flags & KRB5_AUTH_CONTEXT_DO_SEQUENCE) 147 auth_context->local_seqnumber = 148 (auth_context->local_seqnumber + 1) & 0xFFFFFFFF; 149 return 0; 150 151 fail: 152 free (buf); 153 krb5_data_free (&s.enc_part.cipher); 154 return ret; 155 } 156