1 /* $NetBSD: mk_req_ext.c,v 1.2 2017/01/28 21:31:49 christos Exp $ */
2
3 /*
4 * Copyright (c) 1997 - 2002 Kungliga Tekniska Högskolan
5 * (Royal Institute of Technology, Stockholm, Sweden).
6 * All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 *
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
14 *
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
18 *
19 * 3. Neither the name of the Institute nor the names of its contributors
20 * may be used to endorse or promote products derived from this software
21 * without specific prior written permission.
22 *
23 * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
26 * ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33 * SUCH DAMAGE.
34 */
35
36 #include "krb5_locl.h"
37
38 KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
_krb5_mk_req_internal(krb5_context context,krb5_auth_context * auth_context,const krb5_flags ap_req_options,krb5_data * in_data,krb5_creds * in_creds,krb5_data * outbuf,krb5_key_usage checksum_usage,krb5_key_usage encrypt_usage)39 _krb5_mk_req_internal(krb5_context context,
40 krb5_auth_context *auth_context,
41 const krb5_flags ap_req_options,
42 krb5_data *in_data,
43 krb5_creds *in_creds,
44 krb5_data *outbuf,
45 krb5_key_usage checksum_usage,
46 krb5_key_usage encrypt_usage)
47 {
48 krb5_error_code ret;
49 krb5_data authenticator;
50 Checksum c;
51 Checksum *c_opt;
52 krb5_auth_context ac;
53
54 if(auth_context) {
55 if(*auth_context == NULL)
56 ret = krb5_auth_con_init(context, auth_context);
57 else
58 ret = 0;
59 ac = *auth_context;
60 } else
61 ret = krb5_auth_con_init(context, &ac);
62 if(ret)
63 return ret;
64
65 if(ac->local_subkey == NULL && (ap_req_options & AP_OPTS_USE_SUBKEY)) {
66 ret = krb5_auth_con_generatelocalsubkey(context,
67 ac,
68 &in_creds->session);
69 if(ret)
70 goto out;
71 }
72
73 krb5_free_keyblock(context, ac->keyblock);
74 ret = krb5_copy_keyblock(context, &in_creds->session, &ac->keyblock);
75 if (ret)
76 goto out;
77
78 /* it's unclear what type of checksum we can use. try the best one, except:
79 * a) if it's configured differently for the current realm, or
80 * b) if the session key is des-cbc-crc
81 */
82
83 if (in_data) {
84 if(ac->keyblock->keytype == ETYPE_DES_CBC_CRC) {
85 /* this is to make DCE secd (and older MIT kdcs?) happy */
86 ret = krb5_create_checksum(context,
87 NULL,
88 0,
89 CKSUMTYPE_RSA_MD4,
90 in_data->data,
91 in_data->length,
92 &c);
93 } else if(ac->keyblock->keytype == ETYPE_ARCFOUR_HMAC_MD5 ||
94 ac->keyblock->keytype == ETYPE_ARCFOUR_HMAC_MD5_56 ||
95 ac->keyblock->keytype == ETYPE_DES_CBC_MD4 ||
96 ac->keyblock->keytype == ETYPE_DES_CBC_MD5) {
97 /* this is to make MS kdc happy */
98 ret = krb5_create_checksum(context,
99 NULL,
100 0,
101 CKSUMTYPE_RSA_MD5,
102 in_data->data,
103 in_data->length,
104 &c);
105 } else {
106 krb5_crypto crypto;
107
108 ret = krb5_crypto_init(context, ac->keyblock, 0, &crypto);
109 if (ret)
110 goto out;
111 ret = krb5_create_checksum(context,
112 crypto,
113 checksum_usage,
114 0,
115 in_data->data,
116 in_data->length,
117 &c);
118 krb5_crypto_destroy(context, crypto);
119 }
120 c_opt = &c;
121 } else {
122 c_opt = NULL;
123 }
124
125 if (ret)
126 goto out;
127
128 ret = _krb5_build_authenticator(context,
129 ac,
130 ac->keyblock->keytype,
131 in_creds,
132 c_opt,
133 &authenticator,
134 encrypt_usage);
135 if (c_opt)
136 free_Checksum (c_opt);
137 if (ret)
138 goto out;
139
140 ret = krb5_build_ap_req (context, ac->keyblock->keytype,
141 in_creds, ap_req_options, authenticator, outbuf);
142 out:
143 if(auth_context == NULL)
144 krb5_auth_con_free(context, ac);
145 return ret;
146 }
147
148 KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
krb5_mk_req_extended(krb5_context context,krb5_auth_context * auth_context,const krb5_flags ap_req_options,krb5_data * in_data,krb5_creds * in_creds,krb5_data * outbuf)149 krb5_mk_req_extended(krb5_context context,
150 krb5_auth_context *auth_context,
151 const krb5_flags ap_req_options,
152 krb5_data *in_data,
153 krb5_creds *in_creds,
154 krb5_data *outbuf)
155 {
156 return _krb5_mk_req_internal (context,
157 auth_context,
158 ap_req_options,
159 in_data,
160 in_creds,
161 outbuf,
162 KRB5_KU_AP_REQ_AUTH_CKSUM,
163 KRB5_KU_AP_REQ_AUTH);
164 }
165