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 *	$FreeBSD$
27 */
28
29#include <gssapi/gssapi.h>
30#include <stdlib.h>
31#include <errno.h>
32
33#include "mech_switch.h"
34#include "name.h"
35#include "cred.h"
36
37OM_uint32
38gss_acquire_cred(OM_uint32 *minor_status,
39    const gss_name_t desired_name,
40    OM_uint32 time_req,
41    const gss_OID_set desired_mechs,
42    gss_cred_usage_t cred_usage,
43    gss_cred_id_t *output_cred_handle,
44    gss_OID_set *actual_mechs,
45    OM_uint32 *time_rec)
46{
47	OM_uint32 major_status;
48	gss_OID_set mechs = desired_mechs;
49	gss_OID_set_desc set;
50	struct _gss_name *name = (struct _gss_name *) desired_name;
51	struct _gss_mech_switch *m;
52	struct _gss_cred *cred;
53	struct _gss_mechanism_cred *mc;
54	struct _gss_mechanism_name *mn;
55	OM_uint32 min_time, cred_time;
56	size_t i;
57
58	*minor_status = 0;
59	if (output_cred_handle)
60		*output_cred_handle = GSS_C_NO_CREDENTIAL;
61	if (actual_mechs)
62		*actual_mechs = GSS_C_NO_OID_SET;
63	if (time_rec)
64		*time_rec = 0;
65
66	_gss_load_mech();
67
68	/*
69	 * First make sure that at least one of the requested
70	 * mechanisms is one that we support.
71	 */
72	if (mechs) {
73		for (i = 0; i < mechs->count; i++) {
74			int t;
75			gss_test_oid_set_member(minor_status,
76			    &mechs->elements[i], _gss_mech_oids, &t);
77			if (t)
78				break;
79		}
80		if (i == mechs->count) {
81			*minor_status = 0;
82			return (GSS_S_BAD_MECH);
83		}
84	} else {
85		mechs = _gss_mech_oids;
86	}
87
88	if (actual_mechs) {
89		major_status = gss_create_empty_oid_set(minor_status,
90		    actual_mechs);
91		if (major_status)
92			return (major_status);
93	}
94
95	cred = malloc(sizeof(struct _gss_cred));
96	if (!cred) {
97		if (actual_mechs)
98			gss_release_oid_set(minor_status, actual_mechs);
99		*minor_status = ENOMEM;
100		return (GSS_S_FAILURE);
101	}
102	SLIST_INIT(&cred->gc_mc);
103
104	set.count = 1;
105	min_time = GSS_C_INDEFINITE;
106	for (i = 0; i < mechs->count; i++) {
107		m = _gss_find_mech_switch(&mechs->elements[i]);
108		if (!m)
109			continue;
110
111		if (desired_name != GSS_C_NO_NAME) {
112			major_status = _gss_find_mn(minor_status, name,
113						    &mechs->elements[i], &mn);
114			if (major_status != GSS_S_COMPLETE)
115				continue;
116		}
117
118		mc = malloc(sizeof(struct _gss_mechanism_cred));
119		if (!mc) {
120			continue;
121		}
122		mc->gmc_mech = m;
123		mc->gmc_mech_oid = &m->gm_mech_oid;
124
125		/*
126		 * XXX Probably need to do something with actual_mechs.
127		 */
128		set.elements = &mechs->elements[i];
129		major_status = m->gm_acquire_cred(minor_status,
130		    (desired_name != GSS_C_NO_NAME
131			? mn->gmn_name : GSS_C_NO_NAME),
132		    time_req, &set, cred_usage,
133		    &mc->gmc_cred, NULL, &cred_time);
134		if (major_status) {
135			free(mc);
136			continue;
137		}
138		if (cred_time < min_time)
139			min_time = cred_time;
140
141		if (actual_mechs) {
142			major_status = gss_add_oid_set_member(minor_status,
143			    mc->gmc_mech_oid, actual_mechs);
144			if (major_status) {
145				m->gm_release_cred(minor_status,
146				    &mc->gmc_cred);
147				free(mc);
148				continue;
149			}
150		}
151
152		SLIST_INSERT_HEAD(&cred->gc_mc, mc, gmc_link);
153	}
154
155	/*
156	 * If we didn't manage to create a single credential, return
157	 * an error.
158	 */
159	if (!SLIST_FIRST(&cred->gc_mc)) {
160		free(cred);
161		if (actual_mechs)
162			gss_release_oid_set(minor_status, actual_mechs);
163		*minor_status = 0;
164		return (GSS_S_NO_CRED);
165	}
166
167	if (time_rec)
168		*time_rec = min_time;
169	*output_cred_handle = (gss_cred_id_t) cred;
170	*minor_status = 0;
171	return (GSS_S_COMPLETE);
172}
173