Better error reporting through com_err
[mech_eap.git] / inquire_sec_context_by_oid.c
1 /*
2  * Copyright (c) 2010, 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 #include "gssapiP_eap.h"
34
35 static OM_uint32
36 inquireSessionKey(OM_uint32 *minor,
37                   const gss_ctx_id_t ctx,
38                   const gss_OID desired_object,
39                   gss_buffer_set_t *dataSet)
40 {
41     OM_uint32 major, tmpMinor;
42     unsigned char oidBuf[16];
43     gss_buffer_desc buf;
44     gss_OID_desc oid;
45
46     buf.length = KRB_KEY_LENGTH(&ctx->rfc3961Key);
47     buf.value = KRB_KEY_DATA(&ctx->rfc3961Key);
48
49     major = gss_add_buffer_set_member(minor, &buf, dataSet);
50     if (GSS_ERROR(major))
51         goto cleanup;
52
53     oid.length = sizeof(oidBuf);
54     oid.elements = oidBuf;
55
56     major = composeOid(minor,
57                        "\x2a\x86\x48\x86\xf7\x12\x01\x02\x02\x04",
58                        10,
59                        ctx->encryptionType,
60                        &oid);
61     if (GSS_ERROR(major))
62         goto cleanup;
63
64     buf.length = oid.length;
65     buf.value = oid.elements;
66
67     major = gss_add_buffer_set_member(minor, &buf, dataSet);
68     if (GSS_ERROR(major))
69         goto cleanup;
70
71     major = GSS_S_COMPLETE;
72
73 cleanup:
74     if (GSS_ERROR(major) && *dataSet != GSS_C_NO_BUFFER_SET) {
75         gss_buffer_set_t set = *dataSet;
76
77         if (set->count != 0)
78             memset(set->elements[0].value, 0, set->elements[0].length);
79         gss_release_buffer_set(&tmpMinor, dataSet);
80     }
81
82     return major;
83 }
84
85 static struct {
86     gss_OID_desc oid;
87     OM_uint32 (*inquire)(OM_uint32 *, const gss_ctx_id_t,
88                          const gss_OID, gss_buffer_set_t *);
89 } inquireCtxOps[] = {
90     {
91         /* GSS_C_INQ_SSPI_SESSION_KEY */
92         { 11, "\x2a\x86\x48\x86\xf7\x12\x01\x02\x02\x05\x05" },
93         inquireSessionKey
94     },
95     {
96         /* GSS_KRB5_EXPORT_LUCID_SEC_CONTEXT + v1 */
97         { 12, "\x2a\x86\x48\x86\xf7\x12\x01\x02\x02\x05\x06\x01" },
98         gssEapExportLucidSecContext
99     },
100 };
101
102 OM_uint32
103 gss_inquire_sec_context_by_oid(OM_uint32 *minor,
104                                const gss_ctx_id_t ctx,
105                                const gss_OID desired_object,
106                                gss_buffer_set_t *data_set)
107 {
108     OM_uint32 major;
109     int i;
110
111     *data_set = GSS_C_NO_BUFFER_SET;
112
113     GSSEAP_MUTEX_LOCK(&ctx->mutex);
114
115     if (!CTX_IS_ESTABLISHED(ctx)) {
116         *minor = GSSEAP_CONTEXT_INCOMPLETE;
117         major = GSS_S_NO_CONTEXT;
118         goto cleanup;
119     }
120
121     major = GSS_S_UNAVAILABLE;
122
123     for (i = 0; i < sizeof(inquireCtxOps) / sizeof(inquireCtxOps[0]); i++) {
124         if (oidEqual(&inquireCtxOps[i].oid, desired_object)) {
125             major = (*inquireCtxOps[i].inquire)(minor, ctx,
126                                                  desired_object, data_set);
127             break;
128         }
129     }
130
131 cleanup:
132     GSSEAP_MUTEX_UNLOCK(&ctx->mutex);
133
134     return major;
135 }