| 1 | /*
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| 2 | * Copyright (c) 1997 - 2001 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_rd_rep(krb5_context context,
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| 38 | krb5_auth_context auth_context,
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| 39 | const krb5_data *inbuf,
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| 40 | krb5_ap_rep_enc_part **repl)
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| 41 | {
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| 42 | krb5_error_code ret;
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| 43 | AP_REP ap_rep;
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| 44 | size_t len;
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| 45 | krb5_data data;
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| 46 | krb5_crypto crypto;
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| 47 |
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| 48 | krb5_data_zero (&data);
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| 49 |
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| 50 | ret = decode_AP_REP(inbuf->data, inbuf->length, &ap_rep, &len);
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| 51 | if (ret)
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| 52 | return ret;
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| 53 | if (ap_rep.pvno != 5) {
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| 54 | ret = KRB5KRB_AP_ERR_BADVERSION;
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| 55 | krb5_clear_error_message (context);
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| 56 | goto out;
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| 57 | }
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| 58 | if (ap_rep.msg_type != krb_ap_rep) {
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| 59 | ret = KRB5KRB_AP_ERR_MSG_TYPE;
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| 60 | krb5_clear_error_message (context);
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| 61 | goto out;
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| 62 | }
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| 63 |
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| 64 | ret = krb5_crypto_init(context, auth_context->keyblock, 0, &crypto);
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| 65 | if (ret)
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| 66 | goto out;
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| 67 | ret = krb5_decrypt_EncryptedData (context,
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| 68 | crypto,
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| 69 | KRB5_KU_AP_REQ_ENC_PART,
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| 70 | &ap_rep.enc_part,
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| 71 | &data);
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| 72 | krb5_crypto_destroy(context, crypto);
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| 73 | if (ret)
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| 74 | goto out;
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| 75 |
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| 76 | *repl = malloc(sizeof(**repl));
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| 77 | if (*repl == NULL) {
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| 78 | ret = ENOMEM;
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| 79 | krb5_set_error_message(context, ret, N_("malloc: out of memory", ""));
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| 80 | goto out;
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| 81 | }
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| 82 | ret = decode_EncAPRepPart(data.data, data.length, *repl, &len);
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| 83 | if (ret) {
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| 84 | krb5_set_error_message(context, ret, N_("Failed to decode EncAPRepPart", ""));
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| 85 | return ret;
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| 86 | }
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| 87 |
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| 88 | if (auth_context->flags & KRB5_AUTH_CONTEXT_DO_TIME) {
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| 89 | if ((*repl)->ctime != auth_context->authenticator->ctime ||
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| 90 | (*repl)->cusec != auth_context->authenticator->cusec)
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| 91 | {
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| 92 | krb5_free_ap_rep_enc_part(context, *repl);
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| 93 | *repl = NULL;
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| 94 | ret = KRB5KRB_AP_ERR_MUT_FAIL;
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| 95 | krb5_clear_error_message (context);
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| 96 | goto out;
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| 97 | }
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| 98 | }
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| 99 | if ((*repl)->seq_number)
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| 100 | krb5_auth_con_setremoteseqnumber(context, auth_context,
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| 101 | *((*repl)->seq_number));
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| 102 | if ((*repl)->subkey)
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| 103 | krb5_auth_con_setremotesubkey(context, auth_context, (*repl)->subkey);
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| 104 |
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| 105 | out:
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| 106 | krb5_data_free (&data);
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| 107 | free_AP_REP (&ap_rep);
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| 108 | return ret;
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| 109 | }
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| 110 |
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| 111 | KRB5_LIB_FUNCTION void KRB5_LIB_CALL
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| 112 | krb5_free_ap_rep_enc_part (krb5_context context,
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| 113 | krb5_ap_rep_enc_part *val)
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| 114 | {
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| 115 | if (val) {
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| 116 | free_EncAPRepPart (val);
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| 117 | free (val);
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| 118 | }
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| 119 | }
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