1 /*-
2  * Copyright (c) 2005 Doug Rabson
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  * 1. Redistributions of source code must retain the above copyright
9  *    notice, this list of conditions and the following disclaimer.
10  * 2. Redistributions in binary form must reproduce the above copyright
11  *    notice, this list of conditions and the following disclaimer in the
12  *    documentation and/or other materials provided with the distribution.
13  *
14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24  * SUCH DAMAGE.
25  *
26  *	$FreeBSD: src/lib/libgssapi/gss_import_sec_context.c,v 1.1 2005/12/29 14:40:20 dfr Exp $
27  */
28 
29 #include "mech_locl.h"
30 
31 GSSAPI_LIB_FUNCTION OM_uint32 GSSAPI_LIB_CALL
32 gss_import_sec_context(OM_uint32 *minor_status,
33     const gss_buffer_t interprocess_token,
34     gss_ctx_id_t *context_handle)
35 {
36 	OM_uint32 major_status;
37 	gssapi_mech_interface m;
38 	struct _gss_context *ctx;
39 	gss_OID_desc mech_oid;
40 	gss_buffer_desc buf;
41 	unsigned char *p;
42 	size_t len;
43 
44 	*minor_status = 0;
45 	*context_handle = GSS_C_NO_CONTEXT;
46 
47 	/*
48 	 * We added an oid to the front of the token in
49 	 * gss_export_sec_context.
50 	 */
51 	p = interprocess_token->value;
52 	len = interprocess_token->length;
53 	if (len < 2)
54 		return (GSS_S_DEFECTIVE_TOKEN);
55 	mech_oid.length = (p[0] << 8) | p[1];
56 	if (len < mech_oid.length + 2)
57 		return (GSS_S_DEFECTIVE_TOKEN);
58 	mech_oid.elements = p + 2;
59 	buf.length = len - 2 - mech_oid.length;
60 	buf.value = p + 2 + mech_oid.length;
61 
62 	m = __gss_get_mechanism(&mech_oid);
63 	if (!m)
64 		return (GSS_S_DEFECTIVE_TOKEN);
65 
66 	ctx = malloc(sizeof(struct _gss_context));
67 	if (!ctx) {
68 		*minor_status = ENOMEM;
69 		return (GSS_S_FAILURE);
70 	}
71 	ctx->gc_mech = m;
72 	major_status = m->gm_import_sec_context(minor_status,
73 	    &buf, &ctx->gc_ctx);
74 	if (major_status != GSS_S_COMPLETE) {
75 		_gss_mg_error(m, major_status, *minor_status);
76 		free(ctx);
77 	} else {
78 		*context_handle = (gss_ctx_id_t) ctx;
79 	}
80 
81 	return (major_status);
82 }
83