xref: /freebsd/lib/libgssapi/gss_import_sec_context.c (revision db33c6f3ae9d1231087710068ee4ea5398aacca7)
1 /*-
2  * SPDX-License-Identifier: BSD-2-Clause
3  *
4  * Copyright (c) 2005 Doug Rabson
5  * All rights reserved.
6  *
7  * Redistribution and use in source and binary forms, with or without
8  * modification, are permitted provided that the following conditions
9  * are met:
10  * 1. Redistributions of source code must retain the above copyright
11  *    notice, this list of conditions and the following disclaimer.
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  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
17  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
20  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26  * SUCH DAMAGE.
27  */
28 
29 #include <gssapi/gssapi.h>
30 #include <stdlib.h>
31 #include <errno.h>
32 
33 #include "mech_switch.h"
34 #include "context.h"
35 
36 OM_uint32
37 gss_import_sec_context(OM_uint32 *minor_status,
38     const gss_buffer_t interprocess_token,
39     gss_ctx_id_t *context_handle)
40 {
41 	OM_uint32 major_status;
42 	struct _gss_mech_switch *m;
43 	struct _gss_context *ctx;
44 	gss_OID_desc mech_oid;
45 	gss_buffer_desc buf;
46 	unsigned char *p;
47 	size_t len;
48 
49 	*minor_status = 0;
50 	*context_handle = GSS_C_NO_CONTEXT;
51 
52 	/*
53 	 * We added an oid to the front of the token in
54 	 * gss_export_sec_context.
55 	 */
56 	p = interprocess_token->value;
57 	len = interprocess_token->length;
58 	if (len < 2)
59 		return (GSS_S_DEFECTIVE_TOKEN);
60 	mech_oid.length = (p[0] << 8) | p[1];
61 	if (len < mech_oid.length + 2)
62 		return (GSS_S_DEFECTIVE_TOKEN);
63 	mech_oid.elements = p + 2;
64 	buf.length = len - 2 - mech_oid.length;
65 	buf.value = p + 2 + mech_oid.length;
66 
67 	m = _gss_find_mech_switch(&mech_oid);
68 	if (!m)
69 		return (GSS_S_DEFECTIVE_TOKEN);
70 
71 	ctx = malloc(sizeof(struct _gss_context));
72 	if (!ctx) {
73 		*minor_status = ENOMEM;
74 		return (GSS_S_FAILURE);
75 	}
76 	ctx->gc_mech = m;
77 	major_status = m->gm_import_sec_context(minor_status,
78 	    &buf, &ctx->gc_ctx);
79 	if (major_status != GSS_S_COMPLETE) {
80 		_gss_mg_error(m, major_status, *minor_status);
81 		free(ctx);
82 	} else {
83 		*context_handle = (gss_ctx_id_t) ctx;
84 	}
85 
86 	return (major_status);
87 }
88