summaryrefslogtreecommitdiff
path: root/source4/heimdal/lib/hx509/ks_file.c
blob: 87b97af401c5097c5188c6a6539ce0dcc0e1f08d (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
/*
 * Copyright (c) 2005 - 2007 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 "hx_locl.h"
RCSID("$Id: ks_file.c 22465 2008-01-16 14:25:24Z lha $");

typedef enum { USE_PEM, USE_DER } outformat;

struct ks_file {
    hx509_certs certs;
    char *fn;
    outformat format;
};

/*
 *
 */

static int
parse_certificate(hx509_context context, const char *fn, 
		  struct hx509_collector *c, 
		  const hx509_pem_header *headers,
		  const void *data, size_t len)
{
    hx509_cert cert;
    int ret;

    ret = hx509_cert_init_data(context, data, len, &cert);
    if (ret)
	return ret;

    ret = _hx509_collector_certs_add(context, c, cert);
    hx509_cert_free(cert);
    return ret;
}

static int
try_decrypt(hx509_context context,
	    struct hx509_collector *collector,
	    const AlgorithmIdentifier *alg,
	    const EVP_CIPHER *c,
	    const void *ivdata,
	    const void *password,
	    size_t passwordlen,
	    const void *cipher,
	    size_t len)
{
    heim_octet_string clear;
    size_t keylen;
    void *key;
    int ret;

    keylen = EVP_CIPHER_key_length(c);

    key = malloc(keylen);
    if (key == NULL) {
	hx509_clear_error_string(context);
	return ENOMEM;
    }

    ret = EVP_BytesToKey(c, EVP_md5(), ivdata,
			 password, passwordlen,
			 1, key, NULL);
    if (ret <= 0) {
	hx509_set_error_string(context, 0, HX509_CRYPTO_INTERNAL_ERROR,
			       "Failed to do string2key for private key");
	return HX509_CRYPTO_INTERNAL_ERROR;
    }

    clear.data = malloc(len);
    if (clear.data == NULL) {
	hx509_set_error_string(context, 0, ENOMEM,
			       "Out of memory to decrypt for private key");
	ret = ENOMEM;
	goto out;
    }
    clear.length = len;

    {
	EVP_CIPHER_CTX ctx;
	EVP_CIPHER_CTX_init(&ctx);
	EVP_CipherInit_ex(&ctx, c, NULL, key, ivdata, 0);
	EVP_Cipher(&ctx, clear.data, cipher, len);
	EVP_CIPHER_CTX_cleanup(&ctx);
    }	

    ret = _hx509_collector_private_key_add(context,
					   collector,
					   alg,
					   NULL,
					   &clear,
					   NULL);

    memset(clear.data, 0, clear.length);
    free(clear.data);
out:
    memset(key, 0, keylen);
    free(key);
    return ret;
}

static int
parse_rsa_private_key(hx509_context context, const char *fn,
		      struct hx509_collector *c, 
		      const hx509_pem_header *headers,
		      const void *data, size_t len)
{
    int ret = 0;
    const char *enc;

    enc = hx509_pem_find_header(headers, "Proc-Type");
    if (enc) {
	const char *dek;
	char *type, *iv;
	ssize_t ssize, size;
	void *ivdata;
	const EVP_CIPHER *cipher;
	const struct _hx509_password *pw;
	hx509_lock lock;
	int i, decrypted = 0;

	lock = _hx509_collector_get_lock(c);
	if (lock == NULL) {
	    hx509_set_error_string(context, 0, HX509_ALG_NOT_SUPP,
				   "Failed to get password for "
				   "password protected file %s", fn);
	    return HX509_ALG_NOT_SUPP;
	}

	if (strcmp(enc, "4,ENCRYPTED") != 0) {
	    hx509_set_error_string(context, 0, HX509_PARSING_KEY_FAILED,
				   "RSA key encrypted in unknown method %s "
				   "in file",
				   enc, fn);
	    hx509_clear_error_string(context);
	    return HX509_PARSING_KEY_FAILED;
	}

	dek = hx509_pem_find_header(headers, "DEK-Info");
	if (dek == NULL) {
	    hx509_set_error_string(context, 0, HX509_PARSING_KEY_FAILED,
				   "Encrypted RSA missing DEK-Info");
	    return HX509_PARSING_KEY_FAILED;
	}

	type = strdup(dek);
	if (type == NULL) {
	    hx509_clear_error_string(context);
	    return ENOMEM;
	}

	iv = strchr(type, ',');
	if (iv == NULL) {
	    free(type);
	    hx509_set_error_string(context, 0, HX509_PARSING_KEY_FAILED,
				   "IV missing");
	    return HX509_PARSING_KEY_FAILED;
	}

	*iv++ = '\0';

	size = strlen(iv);
	ivdata = malloc(size);
	if (ivdata == NULL) {
	    hx509_clear_error_string(context);
	    free(type);
	    return ENOMEM;
	}

	cipher = EVP_get_cipherbyname(type);
	if (cipher == NULL) {
	    free(ivdata);
	    hx509_set_error_string(context, 0, HX509_ALG_NOT_SUPP,
				   "RSA key encrypted with "
				   "unsupported cipher: %s",
				   type);
	    free(type);
	    return HX509_ALG_NOT_SUPP;
	}

#define PKCS5_SALT_LEN 8

	ssize = hex_decode(iv, ivdata, size);
	free(type);
	type = NULL;
	iv = NULL;

	if (ssize < 0 || ssize < PKCS5_SALT_LEN || ssize < EVP_CIPHER_iv_length(cipher)) {
	    free(ivdata);
	    hx509_set_error_string(context, 0, HX509_PARSING_KEY_FAILED,
				   "Salt have wrong length in RSA key file");
	    return HX509_PARSING_KEY_FAILED;
	}
	
	pw = _hx509_lock_get_passwords(lock);
	if (pw != NULL) {
	    const void *password;
	    size_t passwordlen;

	    for (i = 0; i < pw->len; i++) {
		password = pw->val[i];
		passwordlen = strlen(password);
		
		ret = try_decrypt(context, c, hx509_signature_rsa(),
				  cipher, ivdata, password, passwordlen,
				  data, len);
		if (ret == 0) {
		    decrypted = 1;
		    break;
		}
	    }
	}
	if (!decrypted) {
	    hx509_prompt prompt;
	    char password[128];

	    memset(&prompt, 0, sizeof(prompt));

	    prompt.prompt = "Password for keyfile: ";
	    prompt.type = HX509_PROMPT_TYPE_PASSWORD;
	    prompt.reply.data = password;
	    prompt.reply.length = sizeof(password);

	    ret = hx509_lock_prompt(lock, &prompt);
	    if (ret == 0)
		ret = try_decrypt(context, c, hx509_signature_rsa(),
				  cipher, ivdata, password, strlen(password),
				  data, len);
	    /* XXX add password to lock password collection ? */
	    memset(password, 0, sizeof(password));
	}
	free(ivdata);

    } else {
	heim_octet_string keydata;

	keydata.data = rk_UNCONST(data);
	keydata.length = len;

	ret = _hx509_collector_private_key_add(context,
					       c,
					       hx509_signature_rsa(),
					       NULL,
					       &keydata,
					       NULL);
    }

    return ret;
}


struct pem_formats {
    const char *name;
    int (*func)(hx509_context, const char *, struct hx509_collector *, 
		const hx509_pem_header *, const void *, size_t);
} formats[] = {
    { "CERTIFICATE", parse_certificate },
    { "RSA PRIVATE KEY", parse_rsa_private_key }
};


struct pem_ctx {
    int flags;
    struct hx509_collector *c;
};

static int
pem_func(hx509_context context, const char *type,
	 const hx509_pem_header *header,
	 const void *data, size_t len, void *ctx)
{
    struct pem_ctx *pem_ctx = (struct pem_ctx*)ctx;
    int ret = 0, j;

    for (j = 0; j < sizeof(formats)/sizeof(formats[0]); j++) {
	const char *q = formats[j].name;
	if (strcasecmp(type, q) == 0) {
	    ret = (*formats[j].func)(context, NULL, pem_ctx->c,  header, data, len);
	    if (ret == 0)
		break;
	}
    }
    if (j == sizeof(formats)/sizeof(formats[0])) {
	ret = HX509_UNSUPPORTED_OPERATION;
	hx509_set_error_string(context, 0, ret,
			       "Found no matching PEM format for %s", type);
	return ret;
    }
    if (ret && (pem_ctx->flags & HX509_CERTS_UNPROTECT_ALL))
	return ret;
    return 0;
}

/*
 *
 */

static int
file_init_common(hx509_context context,
		 hx509_certs certs, void **data, int flags, 
		 const char *residue, hx509_lock lock, outformat format)
{
    char *p, *pnext;
    struct ks_file *f = NULL;
    hx509_private_key *keys = NULL;
    int ret;
    struct pem_ctx pem_ctx;

    pem_ctx.flags = flags;
    pem_ctx.c = NULL;

    *data = NULL;

    if (lock == NULL)
	lock = _hx509_empty_lock;

    f = calloc(1, sizeof(*f));
    if (f == NULL) {
	hx509_clear_error_string(context);
	return ENOMEM;
    }
    f->format = format;

    f->fn = strdup(residue);
    if (f->fn == NULL) {
	hx509_clear_error_string(context);
	ret = ENOMEM;
	goto out;
    }

    /* 
     * XXX this is broken, the function should parse the file before
     * overwriting it
     */

    if (flags & HX509_CERTS_CREATE) {
	ret = hx509_certs_init(context, "MEMORY:ks-file-create", 
			       0, lock, &f->certs);
	if (ret)
	    goto out;
	*data = f;
	return 0;
    }

    ret = _hx509_collector_alloc(context, lock, &pem_ctx.c);
    if (ret)
	goto out;

    for (p = f->fn; p != NULL; p = pnext) {
	FILE *f;

	pnext = strchr(p, ',');
	if (pnext)
	    *pnext++ = '\0';
	

	if ((f = fopen(p, "r")) == NULL) {
	    ret = ENOENT;
	    hx509_set_error_string(context, 0, ret, 
				   "Failed to open PEM file \"%s\": %s", 
				   p, strerror(errno));
	    goto out;
	}

	ret = hx509_pem_read(context, f, pem_func, &pem_ctx);
	fclose(f);		     
	if (ret != 0 && ret != HX509_PARSING_KEY_FAILED)
	    goto out;
	else if (ret == HX509_PARSING_KEY_FAILED) {
	    size_t length;
	    void *ptr;
	    int i;

	    ret = _hx509_map_file(p, &ptr, &length, NULL);
	    if (ret) {
		hx509_clear_error_string(context);
		goto out;
	    }

	    for (i = 0; i < sizeof(formats)/sizeof(formats[0]); i++) {
		ret = (*formats[i].func)(context, p, pem_ctx.c, NULL, ptr, length);
		if (ret == 0)
		    break;
	    }
	    _hx509_unmap_file(ptr, length);
	    if (ret)
		goto out;
	}
    }

    ret = _hx509_collector_collect_certs(context, pem_ctx.c, &f->certs);
    if (ret)
	goto out;

    ret = _hx509_collector_collect_private_keys(context, pem_ctx.c, &keys);
    if (ret == 0) {
	int i;

	for (i = 0; keys[i]; i++)
	    _hx509_certs_keys_add(context, f->certs, keys[i]);
	_hx509_certs_keys_free(context, keys);
    }

out:
    if (ret == 0)
	*data = f;
    else {
	if (f->fn)
	    free(f->fn);
	free(f);
    }
    if (pem_ctx.c)
	_hx509_collector_free(pem_ctx.c);

    return ret;
}

static int
file_init_pem(hx509_context context,
	      hx509_certs certs, void **data, int flags, 
	      const char *residue, hx509_lock lock)
{
    return file_init_common(context, certs, data, flags, residue, lock, USE_PEM);
}

static int
file_init_der(hx509_context context,
	      hx509_certs certs, void **data, int flags, 
	      const char *residue, hx509_lock lock)
{
    return file_init_common(context, certs, data, flags, residue, lock, USE_DER);
}

static int
file_free(hx509_certs certs, void *data)
{
    struct ks_file *f = data;
    hx509_certs_free(&f->certs);
    free(f->fn);
    free(f);
    return 0;
}

struct store_ctx {
    FILE *f;
    outformat format;
};

static int
store_func(hx509_context context, void *ctx, hx509_cert c)
{
    struct store_ctx *sc = ctx;
    heim_octet_string data;
    int ret;

    ret = hx509_cert_binary(context, c, &data);
    if (ret)
	return ret;
    
    switch (sc->format) {
    case USE_DER:
	fwrite(data.data, data.length, 1, sc->f);
	free(data.data);
	break;
    case USE_PEM:
	hx509_pem_write(context, "CERTIFICATE", NULL, sc->f, 
			data.data, data.length);
	free(data.data);
	if (_hx509_cert_private_key_exportable(c)) {
	    hx509_private_key key = _hx509_cert_private_key(c);
	    ret = _hx509_private_key_export(context, key, &data);
	    if (ret)
		break;
	    hx509_pem_write(context, _hx509_private_pem_name(key), NULL, sc->f,
			    data.data, data.length);
	    free(data.data);
	}
	break;
    }

    return 0;
}

static int
file_store(hx509_context context, 
	   hx509_certs certs, void *data, int flags, hx509_lock lock)
{
    struct ks_file *f = data;
    struct store_ctx sc;
    int ret;

    sc.f = fopen(f->fn, "w");
    if (sc.f == NULL) {
	hx509_set_error_string(context, 0, ENOENT,
			       "Failed to open file %s for writing");
	return ENOENT;
    }
    sc.format = f->format;

    ret = hx509_certs_iter(context, f->certs, store_func, &sc);
    fclose(sc.f);
    return ret;
}

static int 
file_add(hx509_context context, hx509_certs certs, void *data, hx509_cert c)
{
    struct ks_file *f = data;
    return hx509_certs_add(context, f->certs, c);
}

static int 
file_iter_start(hx509_context context,
		hx509_certs certs, void *data, void **cursor)
{
    struct ks_file *f = data;
    return hx509_certs_start_seq(context, f->certs, cursor);
}

static int
file_iter(hx509_context context,
	  hx509_certs certs, void *data, void *iter, hx509_cert *cert)
{
    struct ks_file *f = data;
    return hx509_certs_next_cert(context, f->certs, iter, cert);
}

static int
file_iter_end(hx509_context context,
	      hx509_certs certs,
	      void *data,
	      void *cursor)
{
    struct ks_file *f = data;
    return hx509_certs_end_seq(context, f->certs, cursor);
}

static int
file_getkeys(hx509_context context,
	     hx509_certs certs,
	     void *data,
	     hx509_private_key **keys)
{
    struct ks_file *f = data;
    return _hx509_certs_keys_get(context, f->certs, keys);
}

static int
file_addkey(hx509_context context,
	     hx509_certs certs,
	     void *data,
	     hx509_private_key key)
{
    struct ks_file *f = data;
    return _hx509_certs_keys_add(context, f->certs, key);
}

static struct hx509_keyset_ops keyset_file = {
    "FILE",
    0,
    file_init_pem,
    file_store,
    file_free,
    file_add,
    NULL,
    file_iter_start,
    file_iter,
    file_iter_end,
    NULL,
    file_getkeys,
    file_addkey
};

static struct hx509_keyset_ops keyset_pemfile = {
    "PEM-FILE",
    0,
    file_init_pem,
    file_store,
    file_free,
    file_add,
    NULL,
    file_iter_start,
    file_iter,
    file_iter_end,
    NULL,
    file_getkeys,
    file_addkey
};

static struct hx509_keyset_ops keyset_derfile = {
    "DER-FILE",
    0,
    file_init_der,
    file_store,
    file_free,
    file_add,
    NULL,
    file_iter_start,
    file_iter,
    file_iter_end,
    NULL,
    file_getkeys,
    file_addkey
};


void
_hx509_ks_file_register(hx509_context context)
{
    _hx509_ks_register(context, &keyset_file);
    _hx509_ks_register(context, &keyset_pemfile);
    _hx509_ks_register(context, &keyset_derfile);
}