summaryrefslogtreecommitdiffstats
path: root/libopkg/opkg_download.c
blob: cda5ae84f9eb83ff820c680ea114b1958f7100ca (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
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
/* vi: set noexpandtab sw=4 sts=4: */
/* opkg_download.c - the opkg package management system

   Carl D. Worth

   Copyright (C) 2001 University of Southern California
   Copyright (C) 2008 OpenMoko Inc

   This program is free software; you can redistribute it and/or
   modify it under the terms of the GNU General Public License as
   published by the Free Software Foundation; either version 2, or (at
   your option) any later version.

   This program is distributed in the hope that it will be useful, but
   WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   General Public License for more details.
*/

#include "config.h"

#include <stdio.h>
#include <unistd.h>
#include <libgen.h>

#include "opkg_download.h"
#include "opkg_message.h"

#include "sprintf_alloc.h"
#include "xsystem.h"
#include "file_util.h"
#include "opkg_defines.h"
#include "libbb/libbb.h"

#ifdef HAVE_CURL
#include <curl/curl.h>
#endif

#if defined(HAVE_SSLCURL) || defined(HAVE_OPENSSL)
#include <openssl/conf.h>
#include <openssl/evp.h>
#include <openssl/err.h>
#include <openssl/ssl.h>
#endif

#if defined(HAVE_GPGME)
#include <gpgme.h>
#elif defined(HAVE_OPENSSL)
#include <openssl/bio.h>
#include <openssl/objects.h>
#include <openssl/x509.h>
#include <openssl/pem.h>
#include <openssl/hmac.h>
#endif

#ifdef HAVE_PATHFINDER
#include "opkg_pathfinder.h"
#endif

#if defined(HAVE_OPENSSL) || defined(HAVE_SSLCURL)
static void openssl_init(void);
#endif

#ifdef HAVE_OPENSSL
static X509_STORE *setup_verify(char *CAfile, char *CApath);
#endif

#ifdef HAVE_CURL
/*
 * Make curl an instance variable so we don't have to instanciate it
 * each time
 */
static CURL *curl = NULL;
static CURL *opkg_curl_init(curl_progress_func cb, void *data);
#endif

static int
str_starts_with(const char *str, const char *prefix)
{
    return (strncmp(str, prefix, strlen(prefix)) == 0);
}

int
opkg_download(const char *src, const char *dest_file_name,
	curl_progress_func cb, void *data, const short hide_error)
{
    int err = 0;

    char *src_basec = xstrdup(src);
    char *src_base = basename(src_basec);
    char *tmp_file_location;

    opkg_msg(NOTICE,"Downloading %s.\n", src);

    if (str_starts_with(src, "file:")) {
	const char *file_src = src + 5;
	opkg_msg(INFO, "Copying %s to %s...", file_src, dest_file_name);
	err = file_copy(file_src, dest_file_name);
	opkg_msg(INFO, "Done.\n");
        free(src_basec);
	return err;
    }

    sprintf_alloc(&tmp_file_location, "%s/%s", conf->tmp_dir, src_base);
    free(src_basec);
    err = unlink(tmp_file_location);
    if (err && errno != ENOENT) {
	opkg_perror(ERROR, "Failed to unlink %s", tmp_file_location);
	free(tmp_file_location);
	return -1;
    }

    if (conf->http_proxy) {
	opkg_msg(DEBUG, "Setting environment variable: http_proxy = %s.\n",
		conf->http_proxy);
	setenv("http_proxy", conf->http_proxy, 1);
    }
    if (conf->ftp_proxy) {
	opkg_msg(DEBUG, "Setting environment variable: ftp_proxy = %s.\n",
		conf->ftp_proxy);
	setenv("ftp_proxy", conf->ftp_proxy, 1);
    }
    if (conf->no_proxy) {
	opkg_msg(DEBUG,"Setting environment variable: no_proxy = %s.\n",
		conf->no_proxy);
	setenv("no_proxy", conf->no_proxy, 1);
    }

#ifdef HAVE_CURL
    CURLcode res;
    FILE * file = fopen (tmp_file_location, "w");

    curl = opkg_curl_init (cb, data);
    if (curl)
    {
	curl_easy_setopt (curl, CURLOPT_URL, src);
	curl_easy_setopt (curl, CURLOPT_WRITEDATA, file);

	res = curl_easy_perform (curl);
	fclose (file);
	if (res)
	{
	    long error_code;
	    curl_easy_getinfo(curl, CURLINFO_RESPONSE_CODE, &error_code);
	    opkg_msg(hide_error?DEBUG2:ERROR, "Failed to download %s: %s.\n",
		    src, curl_easy_strerror(res));
	    free(tmp_file_location);
	    return -1;
	}

    }
    else
    {
	free(tmp_file_location);
	return -1;
    }
#else
    {
      int res;
      const char *argv[8];
      int i = 0;

      argv[i++] = "wget";
      argv[i++] = "-q";
      if (conf->http_proxy || conf->ftp_proxy) {
	argv[i++] = "-Y";
	argv[i++] = "on";
      }
      argv[i++] = "-O";
      argv[i++] = tmp_file_location;
      argv[i++] = src;
      argv[i++] = NULL;
      res = xsystem(argv);

      if (res) {
	opkg_msg(ERROR, "Failed to download %s, wget returned %d.\n", src, res);
	free(tmp_file_location);
	return -1;
      }
    }
#endif

    err = file_move(tmp_file_location, dest_file_name);

    free(tmp_file_location);

    return err;
}

static int
opkg_download_cache(const char *src, const char *dest_file_name,
	curl_progress_func cb, void *data)
{
    char *cache_name = xstrdup(src);
    char *cache_location, *p;
    int err = 0;

    if (!conf->cache || str_starts_with(src, "file:")) {
	err = opkg_download(src, dest_file_name, cb, data, 0);
	goto out1;
    }

    if(!file_is_dir(conf->cache)){
	    opkg_msg(ERROR, "%s is not a directory.\n",
			    conf->cache);
	    err = 1;
	    goto out1;
    }

    for (p = cache_name; *p; p++)
	if (*p == '/')
	    *p = ',';	/* looks nicer than | or # */

    sprintf_alloc(&cache_location, "%s/%s", conf->cache, cache_name);
    if (file_exists(cache_location))
	opkg_msg(NOTICE, "Copying %s.\n", cache_location);
    else {
       /* cache file with funky name not found, try simple name */
        free(cache_name);
        char *filename = strrchr(dest_file_name,'/');
        if (filename)
           cache_name = xstrdup(filename+1); // strip leading '/'
        else
           cache_name = xstrdup(dest_file_name);
        free(cache_location);
        sprintf_alloc(&cache_location, "%s/%s", conf->cache, cache_name);
        if (file_exists(cache_location))
           opkg_msg(NOTICE, "Copying %s.\n", cache_location);
        else  {
 	    err = opkg_download(src, cache_location, cb, data, 0);
	    if (err) {
	       (void) unlink(cache_location);
	       goto out2;
	  }
	}
    }

    err = file_copy(cache_location, dest_file_name);


out2:
    free(cache_location);
out1:
    free(cache_name);
    return err;
}

int
opkg_download_pkg(pkg_t *pkg, const char *dir)
{
    int err;
    char *url;
    char *stripped_filename;

    if (pkg->src == NULL) {
	opkg_msg(ERROR, "Package %s is not available from any configured src.\n",
		pkg->name);
	return -1;
    }
    if (pkg->filename == NULL) {
	opkg_msg(ERROR, "Package %s does not have a valid filename field.\n",
		pkg->name);
	return -1;
    }

    sprintf_alloc(&url, "%s/%s", pkg->src->value, pkg->filename);

    /* The pkg->filename might be something like
       "../../foo.opk". While this is correct, and exactly what we
       want to use to construct url above, here we actually need to
       use just the filename part, without any directory. */

    stripped_filename = strrchr(pkg->filename, '/');
    if ( ! stripped_filename )
        stripped_filename = pkg->filename;

    sprintf_alloc(&pkg->local_filename, "%s/%s", dir, stripped_filename);

    err = opkg_download_cache(url, pkg->local_filename, NULL, NULL);
    free(url);

    return err;
}

/*
 * Downloads file from url, installs in package database, return package name.
 */
int
opkg_prepare_url_for_install(const char *url, char **namep)
{
     int err = 0;
     pkg_t *pkg;

     pkg = pkg_new();

     if (str_starts_with(url, "http://")
	 || str_starts_with(url, "ftp://")) {
	  char *tmp_file;
	  char *file_basec = xstrdup(url);
	  char *file_base = basename(file_basec);

	  sprintf_alloc(&tmp_file, "%s/%s", conf->tmp_dir, file_base);
	  err = opkg_download(url, tmp_file, NULL, NULL, 0);
	  if (err)
	       return err;

	  err = pkg_init_from_file(pkg, tmp_file);
	  if (err)
	       return err;

	  free(tmp_file);
	  free(file_basec);

     } else if (strcmp(&url[strlen(url) - 4], OPKG_PKG_EXTENSION) == 0
                || strcmp(&url[strlen(url) - 4], IPKG_PKG_EXTENSION) == 0
		|| strcmp(&url[strlen(url) - 4], DPKG_PKG_EXTENSION) == 0) {

	  err = pkg_init_from_file(pkg, url);
	  if (err)
	       return err;
	  opkg_msg(DEBUG2, "Package %s provided by hand (%s).\n",
		  pkg->name, pkg->local_filename);
          pkg->provided_by_hand = 1;

     } else {
       pkg_deinit(pkg);
       free(pkg);
       return 0;
     }

     pkg->dest = conf->default_dest;
     pkg->state_want = SW_INSTALL;
     pkg->state_flag |= SF_PREFER;
     hash_insert_pkg(pkg, 1);

     if (namep) {
	  *namep = pkg->name;
     }
     return 0;
}

int
opkg_verify_file (char *text_file, char *sig_file)
{
#if defined HAVE_GPGME
    if (conf->check_signature == 0 )
        return 0;
    int status = -1;
    gpgme_ctx_t ctx;
    gpgme_data_t sig, text, key;
    gpgme_error_t err;
    gpgme_verify_result_t result;
    gpgme_signature_t s;
    char *trusted_path = NULL;

    gpgme_check_version (NULL);

    err = gpgme_new (&ctx);

    if (err)
	return -1;

    trusted_path = root_filename_alloc("/etc/opkg/trusted.gpg");
    err = gpgme_data_new_from_file (&key, trusted_path, 1);
    free (trusted_path);
    if (err)
    {
      return -1;
    }
    err = gpgme_op_import (ctx, key);
    if (err)
    {
      gpgme_data_release (key);
      return -1;
    }
    gpgme_data_release (key);

    err = gpgme_data_new_from_file (&sig, sig_file, 1);
    if (err)
    {
	gpgme_release (ctx);
	return -1;
    }

    err = gpgme_data_new_from_file (&text, text_file, 1);
    if (err)
    {
        gpgme_data_release (sig);
	gpgme_release (ctx);
	return -1;
    }

    err = gpgme_op_verify (ctx, sig, text, NULL);

    result = gpgme_op_verify_result (ctx);
    if (!result)
	return -1;

    /* see if any of the signitures matched */
    s = result->signatures;
    while (s)
    {
	status = gpg_err_code (s->status);
	if (status == GPG_ERR_NO_ERROR)
	    break;
	s = s->next;
    }


    gpgme_data_release (sig);
    gpgme_data_release (text);
    gpgme_release (ctx);

    return status;
#elif defined HAVE_OPENSSL
    X509_STORE *store = NULL;
    PKCS7 *p7 = NULL;
    BIO *in = NULL, *indata = NULL;

    // Sig check failed by default !
    int status = -1;

    openssl_init();

    // Set-up the key store
    if(!(store = setup_verify(conf->signature_ca_file, conf->signature_ca_path))){
        opkg_msg(ERROR, "Can't open CA certificates.\n");
        goto verify_file_end;
    }

    // Open a BIO to read the sig file
    if (!(in = BIO_new_file(sig_file, "rb"))){
        opkg_msg(ERROR, "Can't open signature file %s.\n", sig_file);
        goto verify_file_end;
    }

    // Read the PKCS7 block contained in the sig file
    p7 = PEM_read_bio_PKCS7(in, NULL, NULL, NULL);
    if(!p7){
        opkg_msg(ERROR, "Can't read signature file %s (Corrupted ?).\n",
		sig_file);
        goto verify_file_end;
    }
#if defined(HAVE_PATHFINDER)
    if(conf->check_x509_path){
	if(!pkcs7_pathfinder_verify_signers(p7)){
	    opkg_msg(ERROR, "pkcs7_pathfinder_verify_signers: "
		    "Path verification failed.\n");
	    goto verify_file_end;
	}
    }
#endif

    // Open the Package file to authenticate
    if (!(indata = BIO_new_file(text_file, "rb"))){
        opkg_msg(ERROR, "Can't open file %s.\n", text_file);
        goto verify_file_end;
    }

    // Let's verify the autenticity !
    if (PKCS7_verify(p7, NULL, store, indata, NULL, PKCS7_BINARY) != 1){
        // Get Off My Lawn!
        opkg_msg(ERROR, "Verification failure.\n");
    }else{
        // Victory !
        status = 0;
    }

verify_file_end:
    BIO_free(in);
    BIO_free(indata);
    PKCS7_free(p7);
    X509_STORE_free(store);

    return status;
#else
    /* mute `unused variable' warnings. */
    (void) sig_file;
    (void) text_file;
    (void) conf;
    return 0;
#endif
}


#if defined(HAVE_OPENSSL) || defined(HAVE_SSLCURL)
static void openssl_init(void){
    static int init = 0;

    if(!init){
	OPENSSL_config(NULL);
        OpenSSL_add_all_algorithms();
        ERR_load_crypto_strings();
        init = 1;
    }
}

#endif


#if defined HAVE_OPENSSL
static X509_STORE *
setup_verify(char *CAfile, char *CApath)
{
    X509_STORE *store = NULL;
    X509_LOOKUP *lookup = NULL;

    if(!(store = X509_STORE_new())){
        // Something bad is happening...
        goto end;
    }

    // adds the X509 file lookup method
    lookup = X509_STORE_add_lookup(store,X509_LOOKUP_file());
    if (lookup == NULL){
        goto end;
    }

    // Autenticating against one CA file
    if (CAfile) {
        if(!X509_LOOKUP_load_file(lookup,CAfile,X509_FILETYPE_PEM)) {
            // Invalid CA => Bye bye
            opkg_msg(ERROR, "Error loading file %s.\n", CAfile);
            goto end;
        }
    } else {
        X509_LOOKUP_load_file(lookup,NULL,X509_FILETYPE_DEFAULT);
    }

    // Now look into CApath directory if supplied
    lookup = X509_STORE_add_lookup(store,X509_LOOKUP_hash_dir());
    if (lookup == NULL){
        goto end;
    }

    if (CApath) {
        if(!X509_LOOKUP_add_dir(lookup,CApath,X509_FILETYPE_PEM)) {
            opkg_msg(ERROR, "Error loading directory %s.\n", CApath);
            goto end;
        }
    } else {
        X509_LOOKUP_add_dir(lookup,NULL,X509_FILETYPE_DEFAULT);
    }

    // All right !
    ERR_clear_error();
    return store;

end:

    X509_STORE_free(store);
    return NULL;

}

#endif

void opkg_curl_cleanup(void){
#ifdef HAVE_CURL
    if(curl != NULL){
	curl_easy_cleanup (curl);
	curl = NULL;
    }
#endif
}

#ifdef HAVE_CURL
static CURL *
opkg_curl_init(curl_progress_func cb, void *data)
{

    if(curl == NULL){
	curl = curl_easy_init();

#ifdef HAVE_SSLCURL
	openssl_init();

	if (conf->ssl_engine) {

	    /* use crypto engine */
	    if (curl_easy_setopt(curl, CURLOPT_SSLENGINE, conf->ssl_engine) != CURLE_OK){
		opkg_msg(ERROR, "Can't set crypto engine '%s'.\n",
			conf->ssl_engine);

		opkg_curl_cleanup();
		return NULL;
	    }
	    /* set the crypto engine as default */
	    if (curl_easy_setopt(curl, CURLOPT_SSLENGINE_DEFAULT, 1L) != CURLE_OK){
		opkg_msg(ERROR, "Can't set crypto engine '%s' as default.\n",
			conf->ssl_engine);

		opkg_curl_cleanup();
		return NULL;
	    }
	}

	/* cert & key can only be in PEM case in the same file */
	if(conf->ssl_key_passwd){
	    if (curl_easy_setopt(curl, CURLOPT_SSLKEYPASSWD, conf->ssl_key_passwd) != CURLE_OK)
	    {
	        opkg_msg(DEBUG, "Failed to set key password.\n");
	    }
	}

	/* sets the client certificate and its type */
	if(conf->ssl_cert_type){
	    if (curl_easy_setopt(curl, CURLOPT_SSLCERTTYPE, conf->ssl_cert_type) != CURLE_OK)
	    {
	        opkg_msg(DEBUG, "Failed to set certificate format.\n");
	    }
	}
	/* SSL cert name isn't mandatory */
	if(conf->ssl_cert){
	        curl_easy_setopt(curl, CURLOPT_SSLCERT, conf->ssl_cert);
	}

	/* sets the client key and its type */
	if(conf->ssl_key_type){
	    if (curl_easy_setopt(curl, CURLOPT_SSLKEYTYPE, conf->ssl_key_type) != CURLE_OK)
	    {
	        opkg_msg(DEBUG, "Failed to set key format.\n");
	    }
	}
	if(conf->ssl_key){
	    if (curl_easy_setopt(curl, CURLOPT_SSLKEY, conf->ssl_key) != CURLE_OK)
	    {
	        opkg_msg(DEBUG, "Failed to set key.\n");
	    }
	}

	/* Should we verify the peer certificate ? */
	if(conf->ssl_dont_verify_peer){
	    /*
	     * CURLOPT_SSL_VERIFYPEER default is nonzero (curl => 7.10)
	     */
	    curl_easy_setopt(curl, CURLOPT_SSL_VERIFYPEER, 0);
	}else{
#ifdef HAVE_PATHFINDER
	    if(conf->check_x509_path){
    	        if (curl_easy_setopt(curl, CURLOPT_SSL_CTX_FUNCTION, curl_ssl_ctx_function) != CURLE_OK){
		    opkg_msg(DEBUG, "Failed to set ssl path verification callback.\n");
		}else{
		    curl_easy_setopt(curl, CURLOPT_SSL_CTX_DATA, NULL);
		}
	    }
#endif
	}

	/* certification authority file and/or path */
	if(conf->ssl_ca_file){
	    curl_easy_setopt(curl, CURLOPT_CAINFO, conf->ssl_ca_file);
	}
	if(conf->ssl_ca_path){
	    curl_easy_setopt(curl, CURLOPT_CAPATH, conf->ssl_ca_path);
	}
#endif

	curl_easy_setopt (curl, CURLOPT_FOLLOWLOCATION, 1);
	curl_easy_setopt (curl, CURLOPT_FAILONERROR, 1);
	if (conf->http_proxy || conf->ftp_proxy)
	{
	    char *userpwd;
	    sprintf_alloc (&userpwd, "%s:%s", conf->proxy_user,
		    conf->proxy_passwd);
	    curl_easy_setopt(curl, CURLOPT_PROXYUSERPWD, userpwd);
	    free (userpwd);
	}
    }

    curl_easy_setopt (curl, CURLOPT_NOPROGRESS, (cb == NULL));
    if (cb)
    {
	curl_easy_setopt (curl, CURLOPT_PROGRESSDATA, data);
	curl_easy_setopt (curl, CURLOPT_PROGRESSFUNCTION, cb);
    }

    return curl;

}
#endif