Change krbCred member to reauthCred to better clarify purpose
[moonshot.git] / moonshot / mech_eap / wrap.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 /*
34  * Message protection services: wrap.
35  */
36
37 #include "gssapiP_eap.h"
38
39 OM_uint32
40 gss_wrap(OM_uint32 *minor,
41          gss_ctx_id_t ctx,
42          int conf_req_flag,
43          gss_qop_t qop_req,
44          gss_buffer_t input_message_buffer,
45          int *conf_state,
46          gss_buffer_t output_message_buffer)
47 {
48     OM_uint32 major;
49
50     if (ctx == GSS_C_NO_CONTEXT) {
51         *minor = EINVAL;
52         return GSS_S_CALL_INACCESSIBLE_READ | GSS_S_NO_CONTEXT;
53     }
54
55     *minor = 0;
56
57     GSSEAP_MUTEX_LOCK(&ctx->mutex);
58
59     if (!CTX_IS_ESTABLISHED(ctx)) {
60         major = GSS_S_NO_CONTEXT;
61         *minor = GSSEAP_CONTEXT_INCOMPLETE;
62         goto cleanup;
63     }
64
65     major = gssEapWrap(minor, ctx, conf_req_flag, qop_req,
66                        input_message_buffer,
67                        conf_state, output_message_buffer);
68     if (GSS_ERROR(major))
69         goto cleanup;
70
71 cleanup:
72     GSSEAP_MUTEX_UNLOCK(&ctx->mutex);
73
74     return major;
75 }
76
77 OM_uint32
78 gssEapWrap(OM_uint32 *minor,
79            gss_ctx_id_t ctx,
80            int conf_req_flag,
81            gss_qop_t qop_req,
82            gss_buffer_t input_message_buffer,
83            int *conf_state,
84            gss_buffer_t output_message_buffer)
85 {
86     OM_uint32 major, tmpMinor;
87     gss_iov_buffer_desc iov[4];
88     unsigned char *p;
89     int i;
90
91     iov[0].type = GSS_IOV_BUFFER_TYPE_HEADER;
92     iov[0].buffer.value = NULL;
93     iov[0].buffer.length = 0;
94
95     iov[1].type = GSS_IOV_BUFFER_TYPE_DATA;
96     iov[1].buffer = *input_message_buffer;
97
98     iov[2].type = GSS_IOV_BUFFER_TYPE_PADDING;
99     iov[2].buffer.value = NULL;
100     iov[2].buffer.length = 0;
101
102     iov[3].type = GSS_IOV_BUFFER_TYPE_TRAILER;
103     iov[3].buffer.value = NULL;
104     iov[3].buffer.length = 0;
105
106     major = gssEapWrapIovLength(minor, ctx, conf_req_flag, qop_req,
107                                 NULL, iov, 4);
108     if (GSS_ERROR(major)) {
109         return major;
110     }
111
112     for (i = 0, output_message_buffer->length = 0; i < 4; i++) {
113         output_message_buffer->length += iov[i].buffer.length;
114     }
115
116     output_message_buffer->value = GSSEAP_MALLOC(output_message_buffer->length);
117     if (output_message_buffer->value == NULL) {
118         *minor = ENOMEM;
119         return GSS_S_FAILURE;
120     }
121
122     for (i = 0, p = output_message_buffer->value; i < 4; i++) {
123         if (iov[i].type == GSS_IOV_BUFFER_TYPE_DATA) {
124             memcpy(p, input_message_buffer->value, input_message_buffer->length);
125         }
126         iov[i].buffer.value = p;
127         p += iov[i].buffer.length;
128     }
129
130     major = gssEapWrapOrGetMIC(minor, ctx, conf_req_flag, conf_state,
131                                iov, 4, TOK_TYPE_WRAP);
132     if (GSS_ERROR(major)) {
133         gss_release_buffer(&tmpMinor, output_message_buffer);
134     }
135
136     return major;
137 }