1/*-
2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
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 *	$FreeBSD$
29 */
30
31#include <gssapi/gssapi.h>
32#include <stdlib.h>
33#include <errno.h>
34
35#include "mech_switch.h"
36#include "context.h"
37
38OM_uint32
39gss_import_sec_context(OM_uint32 *minor_status,
40    const gss_buffer_t interprocess_token,
41    gss_ctx_id_t *context_handle)
42{
43	OM_uint32 major_status;
44	struct _gss_mech_switch *m;
45	struct _gss_context *ctx;
46	gss_OID_desc mech_oid;
47	gss_buffer_desc buf;
48	unsigned char *p;
49	size_t len;
50
51	*minor_status = 0;
52	*context_handle = GSS_C_NO_CONTEXT;
53
54	/*
55	 * We added an oid to the front of the token in
56	 * gss_export_sec_context.
57	 */
58	p = interprocess_token->value;
59	len = interprocess_token->length;
60	if (len < 2)
61		return (GSS_S_DEFECTIVE_TOKEN);
62	mech_oid.length = (p[0] << 8) | p[1];
63	if (len < mech_oid.length + 2)
64		return (GSS_S_DEFECTIVE_TOKEN);
65	mech_oid.elements = p + 2;
66	buf.length = len - 2 - mech_oid.length;
67	buf.value = p + 2 + mech_oid.length;
68
69	m = _gss_find_mech_switch(&mech_oid);
70	if (!m)
71		return (GSS_S_DEFECTIVE_TOKEN);
72
73	ctx = malloc(sizeof(struct _gss_context));
74	if (!ctx) {
75		*minor_status = ENOMEM;
76		return (GSS_S_FAILURE);
77	}
78	ctx->gc_mech = m;
79	major_status = m->gm_import_sec_context(minor_status,
80	    &buf, &ctx->gc_ctx);
81	if (major_status != GSS_S_COMPLETE) {
82		_gss_mg_error(m, major_status, *minor_status);
83		free(ctx);
84	} else {
85		*context_handle = (gss_ctx_id_t) ctx;
86	}
87
88	return (major_status);
89}
90