summaryrefslogtreecommitdiff
path: root/source4/heimdal/lib/gssapi/krb5/acquire_cred.c
blob: d5c70636bc5824f9834fa8232494d460e65c4765 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
/*
 * Copyright (c) 1997 - 2005 Kungliga Tekniska Högskolan
 * (Royal Institute of Technology, Stockholm, Sweden). 
 * All rights reserved. 
 *
 * Redistribution and use in source and binary forms, with or without 
 * modification, are permitted provided that the following conditions 
 * are met: 
 *
 * 1. Redistributions of source code must retain the above copyright 
 *    notice, this list of conditions and the following disclaimer. 
 *
 * 2. Redistributions in binary form must reproduce the above copyright 
 *    notice, this list of conditions and the following disclaimer in the 
 *    documentation and/or other materials provided with the distribution. 
 *
 * 3. Neither the name of the Institute nor the names of its contributors 
 *    may be used to endorse or promote products derived from this software 
 *    without specific prior written permission. 
 *
 * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND 
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE 
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 
 * SUCH DAMAGE. 
 */

#include "krb5/gsskrb5_locl.h"

RCSID("$Id: acquire_cred.c 21221 2007-06-20 08:42:10Z lha $");

OM_uint32
__gsskrb5_ccache_lifetime(OM_uint32 *minor_status,
			  krb5_context context,
			  krb5_ccache id,
			  krb5_principal principal,
			  OM_uint32 *lifetime)
{
    krb5_creds in_cred, *out_cred;
    krb5_const_realm realm;
    krb5_error_code kret;

    memset(&in_cred, 0, sizeof(in_cred));
    in_cred.client = principal;
	
    realm = krb5_principal_get_realm(context,  principal);
    if (realm == NULL) {
	_gsskrb5_clear_status ();
	*minor_status = KRB5_PRINC_NOMATCH; /* XXX */
	return GSS_S_FAILURE;
    }

    kret = krb5_make_principal(context, &in_cred.server, 
			       realm, KRB5_TGS_NAME, realm, NULL);
    if (kret) {
	*minor_status = kret;
	return GSS_S_FAILURE;
    }

    kret = krb5_get_credentials(context, 0, 
				id, &in_cred, &out_cred);
    krb5_free_principal(context, in_cred.server);
    if (kret) {
	*minor_status = kret;
	return GSS_S_FAILURE;
    }

    *lifetime = out_cred->times.endtime;
    krb5_free_creds(context, out_cred);

    return GSS_S_COMPLETE;
}




static krb5_error_code
get_keytab(krb5_context context, krb5_keytab *keytab)
{
    char kt_name[256];
    krb5_error_code kret;

    HEIMDAL_MUTEX_lock(&gssapi_keytab_mutex);

    if (_gsskrb5_keytab != NULL) {
	kret = krb5_kt_get_name(context,
				_gsskrb5_keytab,
				kt_name, sizeof(kt_name));
	if (kret == 0)
	    kret = krb5_kt_resolve(context, kt_name, keytab);
    } else
	kret = krb5_kt_default(context, keytab);

    HEIMDAL_MUTEX_unlock(&gssapi_keytab_mutex);

    return (kret);
}

static OM_uint32 acquire_initiator_cred
		  (OM_uint32 * minor_status,
		   krb5_context context,
		   const gss_name_t desired_name,
		   OM_uint32 time_req,
		   const gss_OID_set desired_mechs,
		   gss_cred_usage_t cred_usage,
		   gsskrb5_cred handle,
		   gss_OID_set * actual_mechs,
		   OM_uint32 * time_rec
		  )
{
    OM_uint32 ret;
    krb5_creds cred;
    krb5_principal def_princ;
    krb5_get_init_creds_opt *opt;
    krb5_ccache ccache;
    krb5_keytab keytab;
    krb5_error_code kret;

    keytab = NULL;
    ccache = NULL;
    def_princ = NULL;
    ret = GSS_S_FAILURE;
    memset(&cred, 0, sizeof(cred));

    /* If we have a preferred principal, lets try to find it in all
     * caches, otherwise, fall back to default cache.  Ignore
     * errors. */
    if (handle->principal)
	kret = krb5_cc_cache_match (context,
				    handle->principal,
				    NULL,
				    &ccache);
    
    if (ccache == NULL) {
	kret = krb5_cc_default(context, &ccache);
	if (kret)
	    goto end;
    }
    kret = krb5_cc_get_principal(context, ccache,
	&def_princ);
    if (kret != 0) {
	/* we'll try to use a keytab below */
	krb5_cc_destroy(context, ccache);
	ccache = NULL;
	kret = 0;
    } else if (handle->principal == NULL)  {
	kret = krb5_copy_principal(context, def_princ,
	    &handle->principal);
	if (kret)
	    goto end;
    } else if (handle->principal != NULL &&
	krb5_principal_compare(context, handle->principal,
	def_princ) == FALSE) {
	/* Before failing, lets check the keytab */
	krb5_free_principal(context, def_princ);
	def_princ = NULL;
    }
    if (def_princ == NULL) {
	/* We have no existing credentials cache,
	 * so attempt to get a TGT using a keytab.
	 */
	if (handle->principal == NULL) {
	    kret = krb5_get_default_principal(context,
		&handle->principal);
	    if (kret)
		goto end;
	}
	kret = get_keytab(context, &keytab);
	if (kret)
	    goto end;
	kret = krb5_get_init_creds_opt_alloc(context, &opt);
	if (kret)
	    goto end;
	kret = krb5_get_init_creds_keytab(context, &cred,
	    handle->principal, keytab, 0, NULL, opt);
	krb5_get_init_creds_opt_free(context, opt);
	if (kret)
	    goto end;
	kret = krb5_cc_gen_new(context, &krb5_mcc_ops,
		&ccache);
	if (kret)
	    goto end;
	kret = krb5_cc_initialize(context, ccache, cred.client);
	if (kret)
	    goto end;
	kret = krb5_cc_store_cred(context, ccache, &cred);
	if (kret)
	    goto end;
	handle->lifetime = cred.times.endtime;
	handle->cred_flags |= GSS_CF_DESTROY_CRED_ON_RELEASE;
    } else {

	ret = __gsskrb5_ccache_lifetime(minor_status,
					context,
					ccache,
					handle->principal,
					&handle->lifetime);
	if (ret != GSS_S_COMPLETE)
	    goto end;
	kret = 0;
    }

    handle->ccache = ccache;
    ret = GSS_S_COMPLETE;

end:
    if (cred.client != NULL)
	krb5_free_cred_contents(context, &cred);
    if (def_princ != NULL)
	krb5_free_principal(context, def_princ);
    if (keytab != NULL)
	krb5_kt_close(context, keytab);
    if (ret != GSS_S_COMPLETE) {
	if (ccache != NULL)
	    krb5_cc_close(context, ccache);
	if (kret != 0) {
	    *minor_status = kret;
	}
    }
    return (ret);
}

static OM_uint32 acquire_acceptor_cred
		  (OM_uint32 * minor_status,
		   krb5_context context,
		   const gss_name_t desired_name,
		   OM_uint32 time_req,
		   const gss_OID_set desired_mechs,
		   gss_cred_usage_t cred_usage,
		   gsskrb5_cred handle,
		   gss_OID_set * actual_mechs,
		   OM_uint32 * time_rec
		  )
{
    OM_uint32 ret;
    krb5_error_code kret;

    kret = 0;
    ret = GSS_S_FAILURE;
    kret = get_keytab(context, &handle->keytab);
    if (kret)
	goto end;
    
    /* check that the requested principal exists in the keytab */
    if (handle->principal) {
	krb5_keytab_entry entry;

	kret = krb5_kt_get_entry(context, handle->keytab, 
				 handle->principal, 0, 0, &entry);
	if (kret)
	    goto end;
	krb5_kt_free_entry(context, &entry);
	ret = GSS_S_COMPLETE;
    }
 
end:
    if (ret != GSS_S_COMPLETE) {
	if (handle->keytab != NULL)
	    krb5_kt_close(context, handle->keytab);
	if (kret != 0) {
	    *minor_status = kret;
	}
    }
    return (ret);
}

OM_uint32 _gsskrb5_acquire_cred
(OM_uint32 * minor_status,
 const gss_name_t desired_name,
 OM_uint32 time_req,
 const gss_OID_set desired_mechs,
 gss_cred_usage_t cred_usage,
 gss_cred_id_t * output_cred_handle,
 gss_OID_set * actual_mechs,
 OM_uint32 * time_rec
    )
{
    krb5_context context;
    gsskrb5_cred handle;
    OM_uint32 ret;

    if (cred_usage != GSS_C_ACCEPT && cred_usage != GSS_C_INITIATE && cred_usage != GSS_C_BOTH) {
	*minor_status = GSS_KRB5_S_G_BAD_USAGE;
	return GSS_S_FAILURE;
    }

    GSSAPI_KRB5_INIT(&context);

    *output_cred_handle = NULL;
    if (time_rec)
	*time_rec = 0;
    if (actual_mechs)
	*actual_mechs = GSS_C_NO_OID_SET;

    if (desired_mechs) {
	int present = 0;

	ret = gss_test_oid_set_member(minor_status, GSS_KRB5_MECHANISM,
				      desired_mechs, &present); 
	if (ret)
	    return ret;
	if (!present) {
	    *minor_status = 0;
	    return GSS_S_BAD_MECH;
	}
    }

    handle = calloc(1, sizeof(*handle));
    if (handle == NULL) {
	*minor_status = ENOMEM;
        return (GSS_S_FAILURE);
    }

    HEIMDAL_MUTEX_init(&handle->cred_id_mutex);

    if (desired_name != GSS_C_NO_NAME) {
	krb5_principal name = (krb5_principal)desired_name;
	ret = krb5_copy_principal(context, name, &handle->principal);
	if (ret) {
	    HEIMDAL_MUTEX_destroy(&handle->cred_id_mutex);
	    *minor_status = ret;
	    free(handle);
	    return GSS_S_FAILURE;
	}
    }
    if (cred_usage == GSS_C_INITIATE || cred_usage == GSS_C_BOTH) {
	ret = acquire_initiator_cred(minor_status, context,
				     desired_name, time_req,
				     desired_mechs, cred_usage, handle,
				     actual_mechs, time_rec);
    	if (ret != GSS_S_COMPLETE) {
	    HEIMDAL_MUTEX_destroy(&handle->cred_id_mutex);
	    krb5_free_principal(context, handle->principal);
	    free(handle);
	    return (ret);
	}
    }
    if (cred_usage == GSS_C_ACCEPT || cred_usage == GSS_C_BOTH) {
	ret = acquire_acceptor_cred(minor_status, context,
				    desired_name, time_req,
				    desired_mechs, cred_usage, handle, actual_mechs, time_rec);
	if (ret != GSS_S_COMPLETE) {
	    HEIMDAL_MUTEX_destroy(&handle->cred_id_mutex);
	    krb5_free_principal(context, handle->principal);
	    free(handle);
	    return (ret);
	}
    }
    ret = gss_create_empty_oid_set(minor_status, &handle->mechanisms);
    if (ret == GSS_S_COMPLETE)
    	ret = gss_add_oid_set_member(minor_status, GSS_KRB5_MECHANISM,
				     &handle->mechanisms);
    if (ret == GSS_S_COMPLETE)
    	ret = _gsskrb5_inquire_cred(minor_status, (gss_cred_id_t)handle, 
				    NULL, time_rec, NULL, actual_mechs);
    if (ret != GSS_S_COMPLETE) {
	if (handle->mechanisms != NULL)
	    gss_release_oid_set(NULL, &handle->mechanisms);
	HEIMDAL_MUTEX_destroy(&handle->cred_id_mutex);
	krb5_free_principal(context, handle->principal);
	free(handle);
	return (ret);
    } 
    *minor_status = 0;
    if (time_rec) {
	ret = _gsskrb5_lifetime_left(minor_status,
				     context,
				     handle->lifetime,
				     time_rec);

	if (ret)
	    return ret;
    }
    handle->usage = cred_usage;
    *output_cred_handle = (gss_cred_id_t)handle;
    return (GSS_S_COMPLETE);
}