1 /*
2 * Copyright (c) 1997 - 2002 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_error_code
_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)37 _krb5_mk_req_internal(krb5_context context,
38 krb5_auth_context *auth_context,
39 const krb5_flags ap_req_options,
40 krb5_data *in_data,
41 krb5_creds *in_creds,
42 krb5_data *outbuf,
43 krb5_key_usage checksum_usage,
44 krb5_key_usage encrypt_usage)
45 {
46 krb5_error_code ret;
47 krb5_data authenticator;
48 Checksum c;
49 Checksum *c_opt;
50 krb5_auth_context ac;
51
52 if(auth_context) {
53 if(*auth_context == NULL)
54 ret = krb5_auth_con_init(context, auth_context);
55 else
56 ret = 0;
57 ac = *auth_context;
58 } else
59 ret = krb5_auth_con_init(context, &ac);
60 if(ret)
61 return ret;
62
63 if(ac->local_subkey == NULL && (ap_req_options & AP_OPTS_USE_SUBKEY)) {
64 ret = krb5_auth_con_generatelocalsubkey(context,
65 ac,
66 &in_creds->session);
67 if(ret)
68 goto out;
69 }
70
71 krb5_free_keyblock(context, ac->keyblock);
72 ret = krb5_copy_keyblock(context, &in_creds->session, &ac->keyblock);
73 if (ret)
74 goto out;
75
76 /* it's unclear what type of checksum we can use. try the best one, except:
77 * a) if it's configured differently for the current realm, or
78 * b) if the session key is des-cbc-crc
79 */
80
81 if (in_data) {
82 if(ac->keyblock->keytype == ETYPE_DES_CBC_CRC) {
83 /* this is to make DCE secd (and older MIT kdcs?) happy */
84 ret = krb5_create_checksum(context,
85 NULL,
86 0,
87 CKSUMTYPE_RSA_MD4,
88 in_data->data,
89 in_data->length,
90 &c);
91 } else if(ac->keyblock->keytype == ETYPE_ARCFOUR_HMAC_MD5 ||
92 ac->keyblock->keytype == ETYPE_ARCFOUR_HMAC_MD5_56 ||
93 ac->keyblock->keytype == ETYPE_DES_CBC_MD4 ||
94 ac->keyblock->keytype == ETYPE_DES_CBC_MD5) {
95 /* this is to make MS kdc happy */
96 ret = krb5_create_checksum(context,
97 NULL,
98 0,
99 CKSUMTYPE_RSA_MD5,
100 in_data->data,
101 in_data->length,
102 &c);
103 } else {
104 krb5_crypto crypto;
105
106 ret = krb5_crypto_init(context, ac->keyblock, 0, &crypto);
107 if (ret)
108 goto out;
109 ret = krb5_create_checksum(context,
110 crypto,
111 checksum_usage,
112 0,
113 in_data->data,
114 in_data->length,
115 &c);
116 krb5_crypto_destroy(context, crypto);
117 }
118 c_opt = &c;
119 } else {
120 c_opt = NULL;
121 }
122
123 if (ret)
124 goto out;
125
126 ret = _krb5_build_authenticator(context,
127 ac,
128 ac->keyblock->keytype,
129 in_creds,
130 c_opt,
131 &authenticator,
132 encrypt_usage);
133 if (c_opt)
134 free_Checksum (c_opt);
135 if (ret)
136 goto out;
137
138 ret = krb5_build_ap_req (context, ac->keyblock->keytype,
139 in_creds, ap_req_options, authenticator, outbuf);
140 out:
141 if(auth_context == NULL)
142 krb5_auth_con_free(context, ac);
143 return ret;
144 }
145
146 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)147 krb5_mk_req_extended(krb5_context context,
148 krb5_auth_context *auth_context,
149 const krb5_flags ap_req_options,
150 krb5_data *in_data,
151 krb5_creds *in_creds,
152 krb5_data *outbuf)
153 {
154 return _krb5_mk_req_internal (context,
155 auth_context,
156 ap_req_options,
157 in_data,
158 in_creds,
159 outbuf,
160 KRB5_KU_AP_REQ_AUTH_CKSUM,
161 KRB5_KU_AP_REQ_AUTH);
162 }
163