gss_init_sec_context.c revision 330897 
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: stable/11/lib/libgssapi/gss_init_sec_context.c 330897 2018-03-14 03:19:51Z eadler $
29 */
30
31#include <gssapi/gssapi.h>
32#include <stdlib.h>
33#include <string.h>
34#include <errno.h>
35
36#include "mech_switch.h"
37#include "name.h"
38#include "cred.h"
39#include "context.h"
40#include "utils.h"
41
42static gss_cred_id_t
43_gss_mech_cred_find(gss_cred_id_t cred_handle, gss_OID mech_type)
44{
45	struct _gss_cred *cred = (struct _gss_cred *)cred_handle;
46	struct _gss_mechanism_cred *mc;
47
48	if (cred == NULL)
49		return GSS_C_NO_CREDENTIAL;
50
51	SLIST_FOREACH(mc, &cred->gc_mc, gmc_link) {
52		if (gss_oid_equal(mech_type, mc->gmc_mech_oid))
53			return mc->gmc_cred;
54	}
55	return GSS_C_NO_CREDENTIAL;
56}
57
58OM_uint32
59gss_init_sec_context(OM_uint32 * minor_status,
60    const gss_cred_id_t initiator_cred_handle,
61    gss_ctx_id_t * context_handle,
62    const gss_name_t target_name,
63    const gss_OID input_mech_type,
64    OM_uint32 req_flags,
65    OM_uint32 time_req,
66    const gss_channel_bindings_t input_chan_bindings,
67    const gss_buffer_t input_token,
68    gss_OID * actual_mech_type,
69    gss_buffer_t output_token,
70    OM_uint32 * ret_flags,
71    OM_uint32 * time_rec)
72{
73	OM_uint32 major_status;
74	struct _gss_mech_switch *m;
75	struct _gss_name *name = (struct _gss_name *) target_name;
76	struct _gss_mechanism_name *mn;
77	struct _gss_context *ctx = (struct _gss_context *) *context_handle;
78	gss_cred_id_t cred_handle;
79	int allocated_ctx;
80	gss_OID mech_type = input_mech_type;
81
82	*minor_status = 0;
83
84	_gss_buffer_zero(output_token);
85	if (actual_mech_type)
86		*actual_mech_type = GSS_C_NO_OID;
87	if (ret_flags)
88		*ret_flags = 0;
89	if (time_rec)
90		*time_rec = 0;
91
92	/*
93	 * If we haven't allocated a context yet, do so now and lookup
94	 * the mechanism switch table. If we have one already, make
95	 * sure we use the same mechanism switch as before.
96	 */
97	if (!ctx) {
98		if (mech_type == GSS_C_NO_OID) {
99			_gss_load_mech();
100			if (_gss_mech_oids == GSS_C_NO_OID_SET
101			    || _gss_mech_oids->count == 0)
102				return (GSS_S_BAD_MECH);
103			mech_type = &_gss_mech_oids->elements[0];
104		}
105
106		ctx = malloc(sizeof(struct _gss_context));
107		if (!ctx) {
108			*minor_status = ENOMEM;
109			return (GSS_S_FAILURE);
110		}
111		memset(ctx, 0, sizeof(struct _gss_context));
112		m = ctx->gc_mech = _gss_find_mech_switch(mech_type);
113		if (!m) {
114			free(ctx);
115			return (GSS_S_BAD_MECH);
116		}
117		allocated_ctx = 1;
118	} else {
119		m = ctx->gc_mech;
120		mech_type = &ctx->gc_mech->gm_mech_oid;
121		allocated_ctx = 0;
122	}
123
124	/*
125	 * Find the MN for this mechanism.
126	 */
127	major_status = _gss_find_mn(minor_status, name, mech_type, &mn);
128	if (major_status != GSS_S_COMPLETE) {
129		if (allocated_ctx)
130			free(ctx);
131		return (major_status);
132	}
133
134	/*
135	 * If we have a cred, find the cred for this mechanism.
136	 */
137	cred_handle = _gss_mech_cred_find(initiator_cred_handle, mech_type);
138
139	major_status = m->gm_init_sec_context(minor_status,
140	    cred_handle,
141	    &ctx->gc_ctx,
142	    mn->gmn_name,
143	    mech_type,
144	    req_flags,
145	    time_req,
146	    input_chan_bindings,
147	    input_token,
148	    actual_mech_type,
149	    output_token,
150	    ret_flags,
151	    time_rec);
152
153	if (major_status != GSS_S_COMPLETE
154	    && major_status != GSS_S_CONTINUE_NEEDED) {
155		if (allocated_ctx)
156			free(ctx);
157		_gss_buffer_zero(output_token);
158		_gss_mg_error(m, major_status, *minor_status);
159	} else {
160		*context_handle = (gss_ctx_id_t) ctx;
161	}
162
163	return (major_status);
164}
165