Change krbCred member to reauthCred to better clarify purpose
[moonshot.git] / moonshot / mech_eap / util_cksum.c
1 /*
2  * Copyright (c) 2011, JANET(UK)
3  * All rights reserved.
4  *
5  * Redistribution and use in source and binary forms, with or without
6  * modification, are permitted provided that the following conditions
7  * are met:
8  *
9  * 1. Redistributions of source code must retain the above copyright
10  *    notice, this list of conditions and the following disclaimer.
11  *
12  * 2. Redistributions in binary form must reproduce the above copyright
13  *    notice, this list of conditions and the following disclaimer in the
14  *    documentation and/or other materials provided with the distribution.
15  *
16  * 3. Neither the name of JANET(UK) nor the names of its contributors
17  *    may be used to endorse or promote products derived from this software
18  *    without specific prior written permission.
19  *
20  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
21  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
24  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30  * SUCH DAMAGE.
31  */
32 /*
33  * Copyright 1993 by OpenVision Technologies, Inc.
34  *
35  * Permission to use, copy, modify, distribute, and sell this software
36  * and its documentation for any purpose is hereby granted without fee,
37  * provided that the above copyright notice appears in all copies and
38  * that both that copyright notice and this permission notice appear in
39  * supporting documentation, and that the name of OpenVision not be used
40  * in advertising or publicity pertaining to distribution of the software
41  * without specific, written prior permission. OpenVision makes no
42  * representations about the suitability of this software for any
43  * purpose.  It is provided "as is" without express or implied warranty.
44  *
45  * OPENVISION DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
46  * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
47  * EVENT SHALL OPENVISION BE LIABLE FOR ANY SPECIAL, INDIRECT OR
48  * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF
49  * USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR
50  * OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
51  * PERFORMANCE OF THIS SOFTWARE.
52  */
53
54 /*
55  * Message protection services: checksum helpers.
56  */
57
58 #include "gssapiP_eap.h"
59
60 static int
61 gssEapChecksum(krb5_context context,
62                krb5_cksumtype type,
63                size_t rrc,
64 #ifdef HAVE_HEIMDAL_VERSION
65                krb5_crypto crypto,
66 #else
67                krb5_keyblock *crypto,
68 #endif
69                krb5_keyusage sign_usage,
70                gss_iov_buffer_desc *iov,
71                int iov_count,
72                int verify,
73                int *valid)
74 {
75     krb5_error_code code;
76     gss_iov_buffer_desc *header;
77     gss_iov_buffer_desc *trailer;
78     krb5_crypto_iov *kiov;
79     size_t kiov_count;
80     int i = 0, j;
81     size_t k5_checksumlen;
82
83     if (verify)
84         *valid = FALSE;
85
86     code = krbCryptoLength(context, crypto, KRB5_CRYPTO_TYPE_CHECKSUM, &k5_checksumlen);
87     if (code != 0)
88         return code;
89
90     header = gssEapLocateIov(iov, iov_count, GSS_IOV_BUFFER_TYPE_HEADER);
91     assert(header != NULL);
92
93     trailer = gssEapLocateIov(iov, iov_count, GSS_IOV_BUFFER_TYPE_TRAILER);
94     assert(rrc != 0 || trailer != NULL);
95
96     if (trailer == NULL) {
97         if (rrc != k5_checksumlen)
98             return KRB5_BAD_MSIZE;
99         if (header->buffer.length != 16 + k5_checksumlen)
100             return KRB5_BAD_MSIZE;
101     } else if (trailer->buffer.length != k5_checksumlen)
102         return KRB5_BAD_MSIZE;
103
104     kiov_count = 2 + iov_count;
105     kiov = (krb5_crypto_iov *)GSSEAP_MALLOC(kiov_count * sizeof(krb5_crypto_iov));
106     if (kiov == NULL)
107         return ENOMEM;
108
109     /* Checksum over ( Data | Header ) */
110
111     /* Data */
112     for (j = 0; j < iov_count; j++) {
113         kiov[i].flags = gssEapMapCryptoFlag(iov[j].type);
114         kiov[i].data.length = iov[j].buffer.length;
115         kiov[i].data.data = (char *)iov[j].buffer.value;
116         i++;
117     }
118
119     /* Header */
120     kiov[i].flags = KRB5_CRYPTO_TYPE_SIGN_ONLY;
121     kiov[i].data.length = 16;
122     kiov[i].data.data = (char *)header->buffer.value;
123     i++;
124
125     /* Checksum */
126     kiov[i].flags = KRB5_CRYPTO_TYPE_CHECKSUM;
127     if (trailer == NULL) {
128         kiov[i].data.length = header->buffer.length - 16;
129         kiov[i].data.data = (char *)header->buffer.value + 16;
130     } else {
131         kiov[i].data.length = trailer->buffer.length;
132         kiov[i].data.data = (char *)trailer->buffer.value;
133     }
134     i++;
135
136 #ifdef HAVE_HEIMDAL_VERSION
137     if (verify) {
138         code = krb5_verify_checksum_iov(context, crypto, sign_usage,
139                                         kiov, kiov_count, &type);
140         *valid = (code == 0);
141     } else {
142         code = krb5_create_checksum_iov(context, crypto, sign_usage,
143                                         kiov, kiov_count, &type);
144     }
145 #else
146     if (verify) {
147         krb5_boolean kvalid = FALSE;
148
149         code = krb5_c_verify_checksum_iov(context, type, crypto,
150                                           sign_usage, kiov, kiov_count, &kvalid);
151
152         *valid = kvalid;
153     } else {
154         code = krb5_c_make_checksum_iov(context, type, crypto,
155                                         sign_usage, kiov, kiov_count);
156     }
157 #endif /* HAVE_HEIMDAL_VERSION */
158
159     GSSEAP_FREE(kiov);
160
161     return code;
162 }
163
164 int
165 gssEapSign(krb5_context context,
166            krb5_cksumtype type,
167            size_t rrc,
168 #ifdef HAVE_HEIMDAL_VERSION
169            krb5_crypto crypto,
170 #else
171            krb5_keyblock *crypto,
172 #endif
173            krb5_keyusage sign_usage,
174            gss_iov_buffer_desc *iov,
175            int iov_count)
176 {
177     return gssEapChecksum(context, type, rrc, crypto,
178                           sign_usage, iov, iov_count, 0, NULL);
179 }
180
181 int
182 gssEapVerify(krb5_context context,
183              krb5_cksumtype type,
184              size_t rrc,
185 #ifdef HAVE_HEIMDAL_VERSION
186              krb5_crypto crypto,
187 #else
188              krb5_keyblock *crypto,
189 #endif
190              krb5_keyusage sign_usage,
191              gss_iov_buffer_desc *iov,
192              int iov_count,
193              int *valid)
194 {
195     return gssEapChecksum(context, type, rrc, crypto,
196                           sign_usage, iov, iov_count, 1, valid);
197 }
198
199 #if 0
200 OM_uint32
201 gssEapEncodeGssChannelBindings(OM_uint32 *minor,
202                                gss_channel_bindings_t chanBindings,
203                                gss_buffer_t encodedBindings)
204 {
205     OM_uint32 major, tmpMinor;
206     size_t length;
207     unsigned char *p;
208
209     if (chanBindings != GSS_C_NO_CHANNEL_BINDINGS) {
210         length = 24;
211         length += chanBindings->initiator_address.length;
212         length += chanBindings->acceptor_address.length;
213         length += chanBindings->application_data.length;
214
215         encodedBindings->value = GSSEAP_MALLOC(length);
216         if (encodedBindings->value == NULL) {
217             *minor = ENOMEM;
218             return GSS_S_FAILURE;
219         }
220
221         encodedBindings->length = length;
222         p = (unsigned char *)encodedBindings->value;
223
224         store_uint32_be(chanBindings->initiator_addrtype, p);
225         store_buffer(&chanBindings->initiator_address, p + 4, 0);
226         p += 4 + chanBindings->initiator_address.length;
227
228         store_uint32_be(chanBindings->acceptor_addrtype, p);
229         store_buffer(&chanBindings->acceptor_address, p + 4, 0);
230         p += 4 + chanBindings->acceptor_address.length;
231
232         store_buffer(&chanBindings->application_data, p, 1);
233         p += chanBindings->application_data.length;
234     } else {
235         encodedBindings->length = 0;
236         encodedBindings->value = NULL;
237     }
238
239     *minor = 0;
240     return GSS_S_COMPLETE;
241 }
242 #endif