1/*
2 * Copyright (c) 2004, PADL Software Pty Ltd.
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 *
9 * 1. Redistributions of source code must retain the above copyright
10 *    notice, this list of conditions and the following disclaimer.
11 *
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 * 3. Neither the name of PADL Software nor the names of its contributors
17 *    may be used to endorse or promote products derived from this software
18 *    without specific prior written permission.
19 *
20 * THIS SOFTWARE IS PROVIDED BY PADL SOFTWARE AND CONTRIBUTORS ``AS IS'' AND
21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23 * ARE DISCLAIMED.  IN NO EVENT SHALL PADL SOFTWARE OR CONTRIBUTORS BE LIABLE
24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30 * SUCH DAMAGE.
31 */
32
33#include "spnego/spnego_locl.h"
34
35RCSID("$Id: compat.c 21866 2007-08-08 11:31:29Z lha $");
36
37/*
38 * Apparently Microsoft got the OID wrong, and used
39 * 1.2.840.48018.1.2.2 instead. We need both this and
40 * the correct Kerberos OID here in order to deal with
41 * this. Because this is manifest in SPNEGO only I'd
42 * prefer to deal with this here rather than inside the
43 * Kerberos mechanism.
44 */
45gss_OID_desc _gss_spnego_mskrb_mechanism_oid_desc =
46	{9, (void *)"\x2a\x86\x48\x82\xf7\x12\x01\x02\x02"};
47
48gss_OID_desc _gss_spnego_krb5_mechanism_oid_desc =
49	{9, (void *)"\x2a\x86\x48\x86\xf7\x12\x01\x02\x02"};
50
51/*
52 * Allocate a SPNEGO context handle
53 */
54OM_uint32 _gss_spnego_alloc_sec_context (OM_uint32 * minor_status,
55					 gss_ctx_id_t *context_handle)
56{
57    gssspnego_ctx ctx;
58
59    ctx = calloc(1, sizeof(*ctx));
60    if (ctx == NULL) {
61	*minor_status = ENOMEM;
62	return GSS_S_FAILURE;
63    }
64
65    ctx->initiator_mech_types.len = 0;
66    ctx->initiator_mech_types.val = NULL;
67    ctx->preferred_mech_type = GSS_C_NO_OID;
68    ctx->negotiated_mech_type = GSS_C_NO_OID;
69    ctx->negotiated_ctx_id = GSS_C_NO_CONTEXT;
70
71    /*
72     * Cache these so we can return them before returning
73     * GSS_S_COMPLETE, even if the mechanism has itself
74     * completed earlier
75     */
76    ctx->mech_flags = 0;
77    ctx->mech_time_rec = 0;
78    ctx->mech_src_name = GSS_C_NO_NAME;
79    ctx->delegated_cred_id = GSS_C_NO_CREDENTIAL;
80
81    ctx->open = 0;
82    ctx->local = 0;
83    ctx->require_mic = 0;
84    ctx->verified_mic = 0;
85
86    HEIMDAL_MUTEX_init(&ctx->ctx_id_mutex);
87
88    *context_handle = (gss_ctx_id_t)ctx;
89
90    return GSS_S_COMPLETE;
91}
92
93/*
94 * Free a SPNEGO context handle. The caller must have acquired
95 * the lock before this is called.
96 */
97OM_uint32 _gss_spnego_internal_delete_sec_context
98           (OM_uint32 *minor_status,
99            gss_ctx_id_t *context_handle,
100            gss_buffer_t output_token
101           )
102{
103    gssspnego_ctx ctx;
104    OM_uint32 ret, minor;
105
106    *minor_status = 0;
107
108    if (context_handle == NULL) {
109	return GSS_S_NO_CONTEXT;
110    }
111
112    if (output_token != GSS_C_NO_BUFFER) {
113	output_token->length = 0;
114	output_token->value = NULL;
115    }
116
117    ctx = (gssspnego_ctx)*context_handle;
118    *context_handle = GSS_C_NO_CONTEXT;
119
120    if (ctx == NULL) {
121	return GSS_S_NO_CONTEXT;
122    }
123
124    if (ctx->initiator_mech_types.val != NULL)
125	free_MechTypeList(&ctx->initiator_mech_types);
126
127    _gss_spnego_release_cred(&minor, &ctx->delegated_cred_id);
128
129    gss_release_oid(&minor, &ctx->preferred_mech_type);
130    ctx->negotiated_mech_type = GSS_C_NO_OID;
131
132    gss_release_name(&minor, &ctx->target_name);
133    gss_release_name(&minor, &ctx->mech_src_name);
134
135    if (ctx->negotiated_ctx_id != GSS_C_NO_CONTEXT) {
136	ret = gss_delete_sec_context(minor_status,
137				     &ctx->negotiated_ctx_id,
138				     output_token);
139	ctx->negotiated_ctx_id = GSS_C_NO_CONTEXT;
140    } else {
141	ret = GSS_S_COMPLETE;
142    }
143
144    HEIMDAL_MUTEX_unlock(&ctx->ctx_id_mutex);
145    HEIMDAL_MUTEX_destroy(&ctx->ctx_id_mutex);
146
147    free(ctx);
148    *context_handle = NULL;
149
150    return ret;
151}
152
153/*
154 * For compatability with the Windows SPNEGO implementation, the
155 * default is to ignore the mechListMIC unless CFX is used and
156 * a non-preferred mechanism was negotiated
157 */
158
159OM_uint32
160_gss_spnego_require_mechlist_mic(OM_uint32 *minor_status,
161				 gssspnego_ctx ctx,
162				 int *require_mic)
163{
164    gss_buffer_set_t buffer_set = GSS_C_NO_BUFFER_SET;
165    OM_uint32 minor;
166
167    *minor_status = 0;
168    *require_mic = 0;
169
170    if (ctx == NULL) {
171	return GSS_S_COMPLETE;
172    }
173
174    if (ctx->require_mic) {
175	/* Acceptor requested it: mandatory to honour */
176	*require_mic = 1;
177	return GSS_S_COMPLETE;
178    }
179
180    /*
181     * Check whether peer indicated implicit support for updated SPNEGO
182     * (eg. in the Kerberos case by using CFX)
183     */
184    if (gss_inquire_sec_context_by_oid(&minor, ctx->negotiated_ctx_id,
185				       GSS_C_PEER_HAS_UPDATED_SPNEGO,
186				       &buffer_set) == GSS_S_COMPLETE) {
187	*require_mic = 1;
188	gss_release_buffer_set(&minor, &buffer_set);
189    }
190
191    /* Safe-to-omit MIC rules follow */
192    if (*require_mic) {
193	if (gss_oid_equal(ctx->negotiated_mech_type, ctx->preferred_mech_type)) {
194	    *require_mic = 0;
195	} else if (gss_oid_equal(ctx->negotiated_mech_type, &_gss_spnego_krb5_mechanism_oid_desc) &&
196		   gss_oid_equal(ctx->preferred_mech_type, &_gss_spnego_mskrb_mechanism_oid_desc)) {
197	    *require_mic = 0;
198	}
199    }
200
201    return GSS_S_COMPLETE;
202}
203
204static int
205add_mech_type(gss_OID mech_type,
206	      int includeMSCompatOID,
207	      MechTypeList *mechtypelist)
208{
209    MechType mech;
210    int ret;
211
212    if (gss_oid_equal(mech_type, GSS_SPNEGO_MECHANISM))
213	return 0;
214
215    if (includeMSCompatOID &&
216	gss_oid_equal(mech_type, &_gss_spnego_krb5_mechanism_oid_desc)) {
217	ret = der_get_oid(_gss_spnego_mskrb_mechanism_oid_desc.elements,
218			  _gss_spnego_mskrb_mechanism_oid_desc.length,
219			  &mech,
220			  NULL);
221	if (ret)
222	    return ret;
223	ret = add_MechTypeList(mechtypelist, &mech);
224	free_MechType(&mech);
225	if (ret)
226	    return ret;
227    }
228    ret = der_get_oid(mech_type->elements, mech_type->length, &mech, NULL);
229    if (ret)
230	return ret;
231    ret = add_MechTypeList(mechtypelist, &mech);
232    free_MechType(&mech);
233    return ret;
234}
235
236
237OM_uint32
238_gss_spnego_indicate_mechtypelist (OM_uint32 *minor_status,
239				   gss_name_t target_name,
240				   OM_uint32 (*func)(gss_name_t, gss_OID),
241				   int includeMSCompatOID,
242				   const gssspnego_cred cred_handle,
243				   MechTypeList *mechtypelist,
244				   gss_OID *preferred_mech)
245{
246    gss_OID_set supported_mechs = GSS_C_NO_OID_SET;
247    gss_OID first_mech = GSS_C_NO_OID;
248    OM_uint32 ret;
249    int i;
250
251    mechtypelist->len = 0;
252    mechtypelist->val = NULL;
253
254    if (cred_handle != NULL) {
255	ret = gss_inquire_cred(minor_status,
256			       cred_handle->negotiated_cred_id,
257			       NULL,
258			       NULL,
259			       NULL,
260			       &supported_mechs);
261    } else {
262	ret = gss_indicate_mechs(minor_status, &supported_mechs);
263    }
264
265    if (ret != GSS_S_COMPLETE) {
266	return ret;
267    }
268
269    if (supported_mechs->count == 0) {
270	*minor_status = ENOENT;
271	gss_release_oid_set(minor_status, &supported_mechs);
272	return GSS_S_FAILURE;
273    }
274
275    ret = (*func)(target_name, GSS_KRB5_MECHANISM);
276    if (ret == GSS_S_COMPLETE) {
277	ret = add_mech_type(GSS_KRB5_MECHANISM,
278			    includeMSCompatOID,
279			    mechtypelist);
280	if (!GSS_ERROR(ret))
281	    first_mech = GSS_KRB5_MECHANISM;
282    }
283    ret = GSS_S_COMPLETE;
284
285    for (i = 0; i < supported_mechs->count; i++) {
286	OM_uint32 subret;
287	if (gss_oid_equal(&supported_mechs->elements[i], GSS_SPNEGO_MECHANISM))
288	    continue;
289	if (gss_oid_equal(&supported_mechs->elements[i], GSS_KRB5_MECHANISM))
290	    continue;
291
292	subret = (*func)(target_name, &supported_mechs->elements[i]);
293	if (subret != GSS_S_COMPLETE)
294	    continue;
295
296	ret = add_mech_type(&supported_mechs->elements[i],
297			    includeMSCompatOID,
298			    mechtypelist);
299	if (ret != 0) {
300	    *minor_status = ret;
301	    ret = GSS_S_FAILURE;
302	    break;
303	}
304	if (first_mech == GSS_C_NO_OID)
305	    first_mech = &supported_mechs->elements[i];
306    }
307
308    if (mechtypelist->len == 0) {
309	gss_release_oid_set(minor_status, &supported_mechs);
310	*minor_status = 0;
311	return GSS_S_BAD_MECH;
312    }
313
314    if (preferred_mech != NULL) {
315	ret = gss_duplicate_oid(minor_status, first_mech, preferred_mech);
316	if (ret != GSS_S_COMPLETE)
317	    free_MechTypeList(mechtypelist);
318    }
319    gss_release_oid_set(minor_status, &supported_mechs);
320
321    return ret;
322}
323