gss_init_sec_context.c revision 171112 
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: head/lib/libgssapi/gss_init_sec_context.c 171112 2007-06-30 07:47:45Z dfr $
27 */
28
29#include <gssapi/gssapi.h>
30#include <stdlib.h>
31#include <string.h>
32#include <errno.h>
33
34#include "mech_switch.h"
35#include "name.h"
36#include "cred.h"
37#include "context.h"
38
39OM_uint32
40gss_init_sec_context(OM_uint32 * minor_status,
41    const gss_cred_id_t initiator_cred_handle,
42    gss_ctx_id_t * context_handle,
43    const gss_name_t target_name,
44    const gss_OID imech_type,
45    OM_uint32 req_flags,
46    OM_uint32 time_req,
47    const gss_channel_bindings_t input_chan_bindings,
48    const gss_buffer_t input_token,
49    gss_OID * actual_mech_type,
50    gss_buffer_t output_token,
51    OM_uint32 * ret_flags,
52    OM_uint32 * time_rec)
53{
54	OM_uint32 major_status;
55	gss_OID mech_type;
56	struct _gss_mech_switch *m;
57	struct _gss_name *name = (struct _gss_name *) target_name;
58	struct _gss_mechanism_name *mn;
59	struct _gss_context *ctx = (struct _gss_context *) *context_handle;
60	struct _gss_cred *cred = (struct _gss_cred *) initiator_cred_handle;
61	struct _gss_mechanism_cred *mc;
62	gss_cred_id_t cred_handle;
63	int allocated_ctx;
64
65	*minor_status = 0;
66
67	if ((mech_type = imech_type) == GSS_C_NO_OID) {
68		_gss_load_mech();
69		mech_type = &SLIST_FIRST(&_gss_mechs)->gm_mech_oid;
70		if (mech_type == NULL)
71			return (GSS_S_BAD_MECH);
72	}
73
74	/*
75	 * If we haven't allocated a context yet, do so now and lookup
76	 * the mechanism switch table. If we have one already, make
77	 * sure we use the same mechanism switch as before.
78	 */
79	if (!ctx) {
80		ctx = malloc(sizeof(struct _gss_context));
81		if (!ctx) {
82			*minor_status = ENOMEM;
83			return (GSS_S_FAILURE);
84		}
85		memset(ctx, 0, sizeof(struct _gss_context));
86		m = ctx->gc_mech = _gss_find_mech_switch(mech_type);
87		if (!m) {
88			free(ctx);
89			return (GSS_S_BAD_MECH);
90		}
91		allocated_ctx = 1;
92	} else {
93		m = ctx->gc_mech;
94		allocated_ctx = 0;
95	}
96
97	/*
98	 * Find the MN for this mechanism.
99	 */
100	mn = _gss_find_mn(name, mech_type);
101	if (mn == NULL) {
102		if (allocated_ctx)
103			free(ctx);
104		return GSS_S_BAD_NAME;
105	}
106
107	/*
108	 * If we have a cred, find the cred for this mechanism.
109	 */
110	cred_handle = GSS_C_NO_CREDENTIAL;
111	if (cred) {
112		SLIST_FOREACH(mc, &cred->gc_mc, gmc_link) {
113			if (_gss_oid_equal(mech_type, mc->gmc_mech_oid)) {
114				cred_handle = mc->gmc_cred;
115				break;
116			}
117		}
118	}
119
120	major_status = m->gm_init_sec_context(minor_status,
121	    cred_handle,
122	    &ctx->gc_ctx,
123	    mn->gmn_name,
124	    mech_type,
125	    req_flags,
126	    time_req,
127	    input_chan_bindings,
128	    input_token,
129	    actual_mech_type,
130	    output_token,
131	    ret_flags,
132	    time_rec);
133
134	if (major_status != GSS_S_COMPLETE
135	    && major_status != GSS_S_CONTINUE_NEEDED) {
136		if (allocated_ctx)
137			free(ctx);
138	} else {
139		*context_handle = (gss_ctx_id_t) ctx;
140	}
141
142	return (major_status);
143}
144