1 /* 2 * Copyright (c) 1997 - 2003 Kungliga Tekniska Högskolan 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 KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL 37 krb5_mk_priv(krb5_context context, 38 krb5_auth_context auth_context, 39 const krb5_data *userdata, 40 krb5_data *outbuf, 41 krb5_replay_data *outdata) 42 { 43 krb5_error_code ret; 44 KRB_PRIV s; 45 EncKrbPrivPart part; 46 u_char *buf = NULL; 47 size_t buf_size; 48 size_t len = 0; 49 krb5_crypto crypto; 50 krb5_keyblock *key; 51 krb5_replay_data rdata; 52 53 if ((auth_context->flags & 54 (KRB5_AUTH_CONTEXT_RET_TIME | KRB5_AUTH_CONTEXT_RET_SEQUENCE)) && 55 outdata == NULL) 56 return KRB5_RC_REQUIRED; /* XXX better error, MIT returns this */ 57 58 if (auth_context->local_subkey) 59 key = auth_context->local_subkey; 60 else if (auth_context->remote_subkey) 61 key = auth_context->remote_subkey; 62 else 63 key = auth_context->keyblock; 64 65 memset(&rdata, 0, sizeof(rdata)); 66 67 part.user_data = *userdata; 68 69 krb5_us_timeofday (context, &rdata.timestamp, &rdata.usec); 70 71 if (auth_context->flags & KRB5_AUTH_CONTEXT_DO_TIME) { 72 part.timestamp = &rdata.timestamp; 73 part.usec = &rdata.usec; 74 } else { 75 part.timestamp = NULL; 76 part.usec = NULL; 77 } 78 79 if (auth_context->flags & KRB5_AUTH_CONTEXT_RET_TIME) { 80 outdata->timestamp = rdata.timestamp; 81 outdata->usec = rdata.usec; 82 } 83 84 if (auth_context->flags & KRB5_AUTH_CONTEXT_DO_SEQUENCE) { 85 rdata.seq = auth_context->local_seqnumber; 86 part.seq_number = &rdata.seq; 87 } else 88 part.seq_number = NULL; 89 90 if (auth_context->flags & KRB5_AUTH_CONTEXT_RET_SEQUENCE) 91 outdata->seq = auth_context->local_seqnumber; 92 93 part.s_address = auth_context->local_address; 94 part.r_address = auth_context->remote_address; 95 96 krb5_data_zero (&s.enc_part.cipher); 97 98 ASN1_MALLOC_ENCODE(EncKrbPrivPart, buf, buf_size, &part, &len, ret); 99 if (ret) 100 goto fail; 101 if (buf_size != len) 102 krb5_abortx(context, "internal error in ASN.1 encoder"); 103 104 s.pvno = 5; 105 s.msg_type = krb_priv; 106 s.enc_part.etype = key->keytype; 107 s.enc_part.kvno = NULL; 108 109 ret = krb5_crypto_init(context, key, 0, &crypto); 110 if (ret) { 111 free (buf); 112 return ret; 113 } 114 ret = krb5_encrypt (context, 115 crypto, 116 KRB5_KU_KRB_PRIV, 117 buf + buf_size - len, 118 len, 119 &s.enc_part.cipher); 120 krb5_crypto_destroy(context, crypto); 121 if (ret) { 122 free(buf); 123 return ret; 124 } 125 free(buf); 126 127 128 ASN1_MALLOC_ENCODE(KRB_PRIV, buf, buf_size, &s, &len, ret); 129 if (ret) 130 goto fail; 131 if (buf_size != len) 132 krb5_abortx(context, "internal error in ASN.1 encoder"); 133 134 krb5_data_free (&s.enc_part.cipher); 135 136 ret = krb5_data_copy(outbuf, buf + buf_size - len, len); 137 if (ret) { 138 krb5_set_error_message(context, ENOMEM, 139 N_("malloc: out of memory", "")); 140 free(buf); 141 return ENOMEM; 142 } 143 free (buf); 144 if (auth_context->flags & KRB5_AUTH_CONTEXT_DO_SEQUENCE) 145 auth_context->local_seqnumber = 146 (auth_context->local_seqnumber + 1) & 0xFFFFFFFF; 147 return 0; 148 149 fail: 150 free (buf); 151 krb5_data_free (&s.enc_part.cipher); 152 return ret; 153 } 154