| 1 | /*
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| 2 | * Copyright (c) 1997 - 2003 Kungliga Tekniska Högskolan
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| 3 | * (Royal Institute of Technology, Stockholm, Sweden).
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| 4 | * All rights reserved.
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| 5 | *
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| 6 | * Redistribution and use in source and binary forms, with or without
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| 7 | * modification, are permitted provided that the following conditions
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| 8 | * are met:
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| 9 | *
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| 10 | * 1. Redistributions of source code must retain the above copyright
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| 11 | * notice, this list of conditions and the following disclaimer.
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| 12 | *
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| 13 | * 2. Redistributions in binary form must reproduce the above copyright
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| 14 | * notice, this list of conditions and the following disclaimer in the
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| 15 | * documentation and/or other materials provided with the distribution.
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| 16 | *
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| 17 | * 3. Neither the name of the Institute nor the names of its contributors
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| 18 | * may be used to endorse or promote products derived from this software
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| 19 | * without specific prior written permission.
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| 20 | *
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| 21 | * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
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| 22 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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| 23 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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| 24 | * ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
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| 25 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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| 26 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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| 27 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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| 28 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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| 29 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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| 30 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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| 31 | * SUCH DAMAGE.
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| 32 | */
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| 33 |
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| 34 | #include "krb5_locl.h"
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| 35 |
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| 36 | KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
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| 37 | krb5_mk_rep(krb5_context context,
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| 38 | krb5_auth_context auth_context,
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| 39 | krb5_data *outbuf)
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| 40 | {
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| 41 | krb5_error_code ret;
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| 42 | AP_REP ap;
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| 43 | EncAPRepPart body;
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| 44 | u_char *buf = NULL;
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| 45 | size_t buf_size;
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| 46 | size_t len = 0;
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| 47 | krb5_crypto crypto;
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| 48 |
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| 49 | ap.pvno = 5;
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| 50 | ap.msg_type = krb_ap_rep;
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| 51 |
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| 52 | memset (&body, 0, sizeof(body));
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| 53 |
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| 54 | body.ctime = auth_context->authenticator->ctime;
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| 55 | body.cusec = auth_context->authenticator->cusec;
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| 56 | if (auth_context->flags & KRB5_AUTH_CONTEXT_USE_SUBKEY) {
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| 57 | if (auth_context->local_subkey == NULL) {
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| 58 | ret = krb5_auth_con_generatelocalsubkey(context,
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| 59 | auth_context,
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| 60 | auth_context->keyblock);
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| 61 | if(ret) {
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| 62 | free_EncAPRepPart(&body);
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| 63 | return ret;
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| 64 | }
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| 65 | }
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| 66 | ret = krb5_copy_keyblock(context, auth_context->local_subkey,
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| 67 | &body.subkey);
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| 68 | if (ret) {
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| 69 | free_EncAPRepPart(&body);
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| 70 | krb5_set_error_message(context, ENOMEM,
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| 71 | N_("malloc: out of memory", ""));
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| 72 | return ENOMEM;
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| 73 | }
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| 74 | } else
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| 75 | body.subkey = NULL;
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| 76 | if (auth_context->flags & KRB5_AUTH_CONTEXT_DO_SEQUENCE) {
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| 77 | if(auth_context->local_seqnumber == 0)
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| 78 | krb5_generate_seq_number (context,
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| 79 | auth_context->keyblock,
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| 80 | &auth_context->local_seqnumber);
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| 81 | ALLOC(body.seq_number, 1);
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| 82 | if (body.seq_number == NULL) {
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| 83 | krb5_set_error_message(context, ENOMEM, "malloc: out of memory");
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| 84 | free_EncAPRepPart(&body);
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| 85 | return ENOMEM;
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| 86 | }
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| 87 | *(body.seq_number) = auth_context->local_seqnumber;
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| 88 | } else
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| 89 | body.seq_number = NULL;
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| 90 |
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| 91 | ap.enc_part.etype = auth_context->keyblock->keytype;
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| 92 | ap.enc_part.kvno = NULL;
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| 93 |
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| 94 | ASN1_MALLOC_ENCODE(EncAPRepPart, buf, buf_size, &body, &len, ret);
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| 95 | free_EncAPRepPart (&body);
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| 96 | if(ret)
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| 97 | return ret;
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| 98 | if (buf_size != len)
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| 99 | krb5_abortx(context, "internal error in ASN.1 encoder");
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| 100 | ret = krb5_crypto_init(context, auth_context->keyblock,
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| 101 | 0 /* ap.enc_part.etype */, &crypto);
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| 102 | if (ret) {
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| 103 | free (buf);
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| 104 | return ret;
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| 105 | }
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| 106 | ret = krb5_encrypt (context,
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| 107 | crypto,
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| 108 | KRB5_KU_AP_REQ_ENC_PART,
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| 109 | buf + buf_size - len,
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| 110 | len,
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| 111 | &ap.enc_part.cipher);
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| 112 | krb5_crypto_destroy(context, crypto);
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| 113 | free(buf);
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| 114 | if (ret)
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| 115 | return ret;
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| 116 |
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| 117 | ASN1_MALLOC_ENCODE(AP_REP, outbuf->data, outbuf->length, &ap, &len, ret);
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| 118 | if (ret == 0 && outbuf->length != len)
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| 119 | krb5_abortx(context, "internal error in ASN.1 encoder");
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| 120 | free_AP_REP (&ap);
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| 121 | return ret;
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| 122 | }
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