summaryrefslogtreecommitdiff
path: root/source4/heimdal/lib/krb5/cache.c
blob: f293a96ed9a195e670481f411d5a839937d6b67c (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
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
/*
 * 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_locl.h"

RCSID("$Id: cache.c,v 1.71 2005/06/16 20:19:57 lha Exp $");

/*
 * Add a new ccache type with operations `ops', overwriting any
 * existing one if `override'.
 * Return an error code or 0.
 */

krb5_error_code KRB5_LIB_FUNCTION
krb5_cc_register(krb5_context context, 
		 const krb5_cc_ops *ops, 
		 krb5_boolean override)
{
    int i;

    for(i = 0; i < context->num_cc_ops && context->cc_ops[i].prefix; i++) {
	if(strcmp(context->cc_ops[i].prefix, ops->prefix) == 0) {
	    if(!override) {
		krb5_set_error_string(context,
				      "ccache type %s already exists",
				      ops->prefix);
		return KRB5_CC_TYPE_EXISTS;
	    }
	    break;
	}
    }
    if(i == context->num_cc_ops) {
	krb5_cc_ops *o = realloc(context->cc_ops,
				 (context->num_cc_ops + 1) *
				 sizeof(*context->cc_ops));
	if(o == NULL) {
	    krb5_set_error_string(context, "malloc: out of memory");
	    return KRB5_CC_NOMEM;
	}
	context->num_cc_ops++;
	context->cc_ops = o;
	memset(context->cc_ops + i, 0, 
	       (context->num_cc_ops - i) * sizeof(*context->cc_ops));
    }
    memcpy(&context->cc_ops[i], ops, sizeof(context->cc_ops[i]));
    return 0;
}

/*
 * Allocate memory for a new ccache in `id' with operations `ops'
 * and name `residual'.
 * Return 0 or an error code.
 */

static krb5_error_code
allocate_ccache (krb5_context context,
		 const krb5_cc_ops *ops,
		 const char *residual,
		 krb5_ccache *id)
{
    krb5_error_code ret;
    krb5_ccache p;

    p = malloc(sizeof(*p));
    if(p == NULL) {
	krb5_set_error_string(context, "malloc: out of memory");
	return KRB5_CC_NOMEM;
    }
    p->ops = ops;
    *id = p;
    ret = p->ops->resolve(context, id, residual);
    if(ret)
	free(p);
    return ret;
}

/*
 * Find and allocate a ccache in `id' from the specification in `residual'.
 * If the ccache name doesn't contain any colon, interpret it as a file name.
 * Return 0 or an error code.
 */

krb5_error_code KRB5_LIB_FUNCTION
krb5_cc_resolve(krb5_context context,
		const char *name,
		krb5_ccache *id)
{
    int i;

    for(i = 0; i < context->num_cc_ops && context->cc_ops[i].prefix; i++) {
	size_t prefix_len = strlen(context->cc_ops[i].prefix);

	if(strncmp(context->cc_ops[i].prefix, name, prefix_len) == 0
	   && name[prefix_len] == ':') {
	    return allocate_ccache (context, &context->cc_ops[i],
				    name + prefix_len + 1,
				    id);
	}
    }
    if (strchr (name, ':') == NULL)
	return allocate_ccache (context, &krb5_fcc_ops, name, id);
    else {
	krb5_set_error_string(context, "unknown ccache type %s", name);
	return KRB5_CC_UNKNOWN_TYPE;
    }
}

/*
 * Generate a new ccache of type `ops' in `id'.
 * Return 0 or an error code.
 */

krb5_error_code KRB5_LIB_FUNCTION
krb5_cc_gen_new(krb5_context context,
		const krb5_cc_ops *ops,
		krb5_ccache *id)
{
    krb5_ccache p;

    p = malloc (sizeof(*p));
    if (p == NULL) {
	krb5_set_error_string(context, "malloc: out of memory");
	return KRB5_CC_NOMEM;
    }
    p->ops = ops;
    *id = p;
    return p->ops->gen_new(context, id);
}

/*
 * Generates a new unique ccache of `type` in `id'. If `type' is NULL,
 * the library chooses the default credential cache type. The supplied
 * `hint' (that can be NULL) is a string that the credential cache
 * type can use to base the name of the credential on, this is to make
 * its easier for the user to differentiate the credentials.
 *
 *  Returns 0 or an error code.
 */

krb5_error_code KRB5_LIB_FUNCTION
krb5_cc_new_unique(krb5_context context, const char *type, 
		   const char *hint, krb5_ccache *id)
{
    const krb5_cc_ops *ops;

    if (type == NULL)
	type = "FILE";

    ops = krb5_cc_get_prefix_ops(context, type);
    if (ops == NULL) {
	krb5_set_error_string(context, "Credential cache type %s is unknown",
			      type);
	return KRB5_CC_UNKNOWN_TYPE;
    }

    return krb5_cc_gen_new(context, ops, id);
}

/*
 * Return the name of the ccache `id'
 */

const char* KRB5_LIB_FUNCTION
krb5_cc_get_name(krb5_context context,
		 krb5_ccache id)
{
    return id->ops->get_name(context, id);
}

/*
 * Return the type of the ccache `id'.
 */

const char* KRB5_LIB_FUNCTION
krb5_cc_get_type(krb5_context context,
		 krb5_ccache id)
{
    return id->ops->prefix;
}

/*
 * Return krb5_cc_ops of a the ccache `id'.
 */

const krb5_cc_ops *
krb5_cc_get_ops(krb5_context context, krb5_ccache id)
{
    return id->ops;
}

/*
 * Expand variables in `str' into `res'
 */

krb5_error_code
_krb5_expand_default_cc_name(krb5_context context, const char *str, char **res)
{
    size_t tlen, len = 0;
    char *tmp, *tmp2, *append;

    *res = NULL;

    while (str && *str) {
	tmp = strstr(str, "%{");
	if (tmp && tmp != str) {
	    append = malloc((tmp - str) + 1);
	    if (append) {
		memcpy(append, str, tmp - str);
		append[tmp - str] = '\0';
	    }
	    str = tmp;
	} else if (tmp) {
	    tmp2 = strchr(tmp, '}');
	    if (tmp2 == NULL) {
		free(*res);
		*res = NULL;
		krb5_set_error_string(context, "variable missing }");
		return KRB5_CONFIG_BADFORMAT;
	    }
	    if (strncasecmp(tmp, "%{uid}", 6) == 0)
		asprintf(&append, "%u", (unsigned)getuid());
	    else if (strncasecmp(tmp, "%{null}", 7) == 0)
		append = strdup("");
	    else {
		free(*res);
		*res = NULL;
		krb5_set_error_string(context, 
				      "expand default cache unknown "
				      "variable \"%.*s\"",
				      (int)(tmp2 - tmp) - 2, tmp + 2);
		return KRB5_CONFIG_BADFORMAT;
	    }
	    str = tmp2 + 1;
	} else {
	    append = strdup(str);
	    str = NULL;
	}
	if (append == NULL) {
	    free(*res);
	    res = NULL;
	    krb5_set_error_string(context, "malloc - out of memory");
	    return ENOMEM;
	}
	
	tlen = strlen(append);
	tmp = realloc(*res, len + tlen + 1);
	if (tmp == NULL) {
	    free(*res);
	    *res = NULL;
	    krb5_set_error_string(context, "malloc - out of memory");
	    return ENOMEM;
	}
	*res = tmp;
	memcpy(*res + len, append, tlen + 1);
	len = len + tlen;
	free(append);
    }    
    return 0;
}

/*
 * Set the default cc name for `context' to `name'.
 */

krb5_error_code KRB5_LIB_FUNCTION
krb5_cc_set_default_name(krb5_context context, const char *name)
{
    krb5_error_code ret = 0;
    char *p;

    if (name == NULL) {
	const char *e = NULL;

	if(!issuid()) {
	    e = getenv("KRB5CCNAME");
	    if (e)
		p = strdup(e);
	}
	if (e == NULL) {
	    e = krb5_config_get_string(context, NULL, "libdefaults",
				       "default_cc_name", NULL);
	    if (e) {
		ret = _krb5_expand_default_cc_name(context, e, &p);
		if (ret)
		    return ret;
	    }
	}
	if (e == NULL)
	    asprintf(&p,"FILE:/tmp/krb5cc_%u", (unsigned)getuid());
    } else
	p = strdup(name);

    if (p == NULL) {
	krb5_set_error_string(context, "malloc - out of memory");
	return ENOMEM;
    }

    if (context->default_cc_name)
	free(context->default_cc_name);

    context->default_cc_name = p;

    return ret;
}

/*
 * Return a pointer to a context static string containing the default
 * ccache name.
 */

const char* KRB5_LIB_FUNCTION
krb5_cc_default_name(krb5_context context)
{
    if (context->default_cc_name == NULL)
	krb5_cc_set_default_name(context, NULL);

    return context->default_cc_name;
}

/*
 * Open the default ccache in `id'.
 * Return 0 or an error code.
 */

krb5_error_code KRB5_LIB_FUNCTION
krb5_cc_default(krb5_context context,
		krb5_ccache *id)
{
    const char *p = krb5_cc_default_name(context);

    if (p == NULL) {
	krb5_set_error_string(context, "malloc - out of memory");
	return ENOMEM;
    }
    return krb5_cc_resolve(context, p, id);
}

/*
 * Create a new ccache in `id' for `primary_principal'.
 * Return 0 or an error code.
 */

krb5_error_code KRB5_LIB_FUNCTION
krb5_cc_initialize(krb5_context context,
		   krb5_ccache id,
		   krb5_principal primary_principal)
{
    return id->ops->init(context, id, primary_principal);
}


/*
 * Remove the ccache `id'.
 * Return 0 or an error code.
 */

krb5_error_code KRB5_LIB_FUNCTION
krb5_cc_destroy(krb5_context context,
		krb5_ccache id)
{
    krb5_error_code ret;

    ret = id->ops->destroy(context, id);
    krb5_cc_close (context, id);
    return ret;
}

/*
 * Stop using the ccache `id' and free the related resources.
 * Return 0 or an error code.
 */

krb5_error_code KRB5_LIB_FUNCTION
krb5_cc_close(krb5_context context,
	      krb5_ccache id)
{
    krb5_error_code ret;
    ret = id->ops->close(context, id);
    free(id);
    return ret;
}

/*
 * Store `creds' in the ccache `id'.
 * Return 0 or an error code.
 */

krb5_error_code KRB5_LIB_FUNCTION
krb5_cc_store_cred(krb5_context context,
		   krb5_ccache id,
		   krb5_creds *creds)
{
    return id->ops->store(context, id, creds);
}

/*
 * Retrieve the credential identified by `mcreds' (and `whichfields')
 * from `id' in `creds'.
 * Return 0 or an error code.
 */

krb5_error_code KRB5_LIB_FUNCTION
krb5_cc_retrieve_cred(krb5_context context,
		      krb5_ccache id,
		      krb5_flags whichfields,
		      const krb5_creds *mcreds,
		      krb5_creds *creds)
{
    krb5_error_code ret;
    krb5_cc_cursor cursor;

    if (id->ops->retrieve != NULL) {
	return id->ops->retrieve(context, id, whichfields,
				 mcreds, creds);
    }

    krb5_cc_start_seq_get(context, id, &cursor);
    while((ret = krb5_cc_next_cred(context, id, &cursor, creds)) == 0){
	if(krb5_compare_creds(context, whichfields, mcreds, creds)){
	    ret = 0;
	    break;
	}
	krb5_free_cred_contents (context, creds);
    }
    krb5_cc_end_seq_get(context, id, &cursor);
    return ret;
}

/*
 * Return the principal of `id' in `principal'.
 * Return 0 or an error code.
 */

krb5_error_code KRB5_LIB_FUNCTION
krb5_cc_get_principal(krb5_context context,
		      krb5_ccache id,
		      krb5_principal *principal)
{
    return id->ops->get_princ(context, id, principal);
}

/*
 * Start iterating over `id', `cursor' is initialized to the
 * beginning.
 * Return 0 or an error code.
 */

krb5_error_code KRB5_LIB_FUNCTION
krb5_cc_start_seq_get (krb5_context context,
		       const krb5_ccache id,
		       krb5_cc_cursor *cursor)
{
    return id->ops->get_first(context, id, cursor);
}

/*
 * Retrieve the next cred pointed to by (`id', `cursor') in `creds'
 * and advance `cursor'.
 * Return 0 or an error code.
 */

krb5_error_code KRB5_LIB_FUNCTION
krb5_cc_next_cred (krb5_context context,
		   const krb5_ccache id,
		   krb5_cc_cursor *cursor,
		   krb5_creds *creds)
{
    return id->ops->get_next(context, id, cursor, creds);
}

/* like krb5_cc_next_cred, but allow for selective retrieval */

krb5_error_code KRB5_LIB_FUNCTION
krb5_cc_next_cred_match(krb5_context context,
			const krb5_ccache id,
			krb5_cc_cursor * cursor,
			krb5_creds * creds,
			krb5_flags whichfields,
			const krb5_creds * mcreds)
{
    krb5_error_code ret;
    while (1) {
	ret = krb5_cc_next_cred(context, id, cursor, creds);
	if (ret)
	    return ret;
	if (mcreds == NULL || krb5_compare_creds(context, whichfields, mcreds, creds))
	    return 0;
	krb5_free_cred_contents(context, creds);
    }
}

/*
 * Destroy the cursor `cursor'.
 */

krb5_error_code KRB5_LIB_FUNCTION
krb5_cc_end_seq_get (krb5_context context,
		     const krb5_ccache id,
		     krb5_cc_cursor *cursor)
{
    return id->ops->end_get(context, id, cursor);
}

/*
 * Remove the credential identified by `cred', `which' from `id'.
 */

krb5_error_code KRB5_LIB_FUNCTION
krb5_cc_remove_cred(krb5_context context,
		    krb5_ccache id,
		    krb5_flags which,
		    krb5_creds *cred)
{
    if(id->ops->remove_cred == NULL) {
	krb5_set_error_string(context,
			      "ccache %s does not support remove_cred",
			      id->ops->prefix);
	return EACCES; /* XXX */
    }
    return (*id->ops->remove_cred)(context, id, which, cred);
}

/*
 * Set the flags of `id' to `flags'.
 */

krb5_error_code KRB5_LIB_FUNCTION
krb5_cc_set_flags(krb5_context context,
		  krb5_ccache id,
		  krb5_flags flags)
{
    return id->ops->set_flags(context, id, flags);
}
		    
/*
 * Copy the contents of `from' to `to'.
 */

krb5_error_code KRB5_LIB_FUNCTION
krb5_cc_copy_cache_match(krb5_context context,
			 const krb5_ccache from,
			 krb5_ccache to,
			 krb5_flags whichfields,
			 const krb5_creds * mcreds,
			 unsigned int *matched)
{
    krb5_error_code ret;
    krb5_cc_cursor cursor;
    krb5_creds cred;
    krb5_principal princ;

    ret = krb5_cc_get_principal(context, from, &princ);
    if (ret)
	return ret;
    ret = krb5_cc_initialize(context, to, princ);
    if (ret) {
	krb5_free_principal(context, princ);
	return ret;
    }
    ret = krb5_cc_start_seq_get(context, from, &cursor);
    if (ret) {
	krb5_free_principal(context, princ);
	return ret;
    }
    if (matched)
	*matched = 0;
    while (ret == 0 &&
	   krb5_cc_next_cred_match(context, from, &cursor, &cred,
				   whichfields, mcreds) == 0) {
	if (matched)
	    (*matched)++;
	ret = krb5_cc_store_cred(context, to, &cred);
	krb5_free_cred_contents(context, &cred);
    }
    krb5_cc_end_seq_get(context, from, &cursor);
    krb5_free_principal(context, princ);
    return ret;
}

krb5_error_code KRB5_LIB_FUNCTION
krb5_cc_copy_cache(krb5_context context,
		   const krb5_ccache from,
		   krb5_ccache to)
{
    return krb5_cc_copy_cache_match(context, from, to, 0, NULL, NULL);
}

/*
 * Return the version of `id'.
 */

krb5_error_code KRB5_LIB_FUNCTION
krb5_cc_get_version(krb5_context context,
		    const krb5_ccache id)
{
    if(id->ops->get_version)
	return id->ops->get_version(context, id);
    else
	return 0;
}

/*
 * Clear `mcreds' so it can be used with krb5_cc_retrieve_cred
 */

void KRB5_LIB_FUNCTION
krb5_cc_clear_mcred(krb5_creds *mcred)
{
    memset(mcred, 0, sizeof(*mcred));
}

/*
 * Get the cc ops that is registered in `context' to handle the
 * `prefix'. Returns NULL if ops not found.
 */

const krb5_cc_ops *
krb5_cc_get_prefix_ops(krb5_context context, const char *prefix)
{
    int i;

    for(i = 0; i < context->num_cc_ops && context->cc_ops[i].prefix; i++) {
	if(strcmp(context->cc_ops[i].prefix, prefix) == 0)
	    return &context->cc_ops[i];
    }
    return NULL;
}