libopkg/opkg_download.c

   1 /* vi: set noexpandtab sw=4 sts=4: */
   2 /* opkg_download.c - the opkg package management system
   3
   4    Carl D. Worth
   5
   6    Copyright (C) 2001 University of Southern California
   7    Copyright (C) 2008 OpenMoko Inc
   8
   9    This program is free software; you can redistribute it and/or
  10    modify it under the terms of the GNU General Public License as
  11    published by the Free Software Foundation; either version 2, or (at
  12    your option) any later version.
  13
  14    This program is distributed in the hope that it will be useful, but
  15    WITHOUT ANY WARRANTY; without even the implied warranty of
  16    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  17    General Public License for more details.
  18 */
  19
  20 #include "config.h"
  21
  22 #include <sys/wait.h>
  23 #include <stdio.h>
  24 #include <unistd.h>
  25 #include <libgen.h>
  26
  27 #include "opkg_download.h"
  28 #include "opkg_message.h"
  29
  30 #include "sprintf_alloc.h"
  31 #include "xsystem.h"
  32 #include "file_util.h"
  33 #include "opkg_defines.h"
  34 #include "libbb/libbb.h"
  35
  36 #ifdef HAVE_CURL
  37 #include <curl/curl.h>
  38 #endif
  39
  40 #if defined(HAVE_SSLCURL) || defined(HAVE_OPENSSL)
  41 #include <openssl/conf.h>
  42 #include <openssl/evp.h>
  43 #include <openssl/err.h>
  44 #include <openssl/ssl.h>
  45 #endif
  46
  47 #if defined(HAVE_GPGME)
  48 #include <gpgme.h>
  49 #elif defined(HAVE_OPENSSL)
  50 #include <openssl/bio.h>
  51 #include <openssl/objects.h>
  52 #include <openssl/x509.h>
  53 #include <openssl/pem.h>
  54 #include <openssl/hmac.h>
  55 #endif
  56
  57 #ifdef HAVE_PATHFINDER
  58 #include "opkg_pathfinder.h"
  59 #endif
  60
  61 #if defined(HAVE_OPENSSL) || defined(HAVE_SSLCURL)
  62 static void openssl_init(void);
  63 #endif
  64
  65 #ifdef HAVE_OPENSSL
  66 static X509_STORE *setup_verify(char *CAfile, char *CApath);
  67 #endif
  68
  69 #ifdef HAVE_CURL
  70 /*
  71  * Make curl an instance variable so we don't have to instanciate it
  72  * each time
  73  */
  74 static CURL *curl = NULL;
  75 static CURL *opkg_curl_init(curl_progress_func cb, void *data);
  76 #endif
  77
  78 static int
  79 str_starts_with(const char *str, const char *prefix)
  80 {
  81     return (strncmp(str, prefix, strlen(prefix)) == 0);
  82 }
  83
  84 int
  85 opkg_download(const char *src, const char *dest_file_name,
  86         curl_progress_func cb, void *data, const short hide_error)
  87 {
  88     int err = 0;
  89
  90     char *src_basec = xstrdup(src);
  91     char *src_base = basename(src_basec);
  92     char *tmp_file_location;
  93
  94     opkg_msg(NOTICE,"Downloading %s.\n", src);
  95
  96     if (str_starts_with(src, "file:")) {
  97         const char *file_src = src + 5;
  98         opkg_msg(INFO, "Copying %s to %s...", file_src, dest_file_name);
  99         err = file_copy(file_src, dest_file_name);
 100         opkg_msg(INFO, "Done.\n");
 101         free(src_basec);
 102         return err;
 103     }
 104
 105     sprintf_alloc(&tmp_file_location, "%s/%s", conf->tmp_dir, src_base);
 106     free(src_basec);
 107     err = unlink(tmp_file_location);
 108     if (err && errno != ENOENT) {
 109         opkg_perror(ERROR, "Failed to unlink %s", tmp_file_location);
 110         free(tmp_file_location);
 111         return -1;
 112     }
 113
 114     if (conf->http_proxy) {
 115         opkg_msg(DEBUG, "Setting environment variable: http_proxy = %s.\n",
 116                 conf->http_proxy);
 117         setenv("http_proxy", conf->http_proxy, 1);
 118     }
 119     if (conf->ftp_proxy) {
 120         opkg_msg(DEBUG, "Setting environment variable: ftp_proxy = %s.\n",
 121                 conf->ftp_proxy);
 122         setenv("ftp_proxy", conf->ftp_proxy, 1);
 123     }
 124     if (conf->no_proxy) {
 125         opkg_msg(DEBUG,"Setting environment variable: no_proxy = %s.\n",
 126                 conf->no_proxy);
 127         setenv("no_proxy", conf->no_proxy, 1);
 128     }
 129
 130 #ifdef HAVE_CURL
 131     CURLcode res;
 132     FILE * file = fopen (tmp_file_location, "w");
 133
 134     curl = opkg_curl_init (cb, data);
 135     if (curl)
 136     {
 137         curl_easy_setopt (curl, CURLOPT_URL, src);
 138         curl_easy_setopt (curl, CURLOPT_WRITEDATA, file);
 139
 140         res = curl_easy_perform (curl);
 141         fclose (file);
 142         if (res)
 143         {
 144             long error_code;
 145             curl_easy_getinfo(curl, CURLINFO_RESPONSE_CODE, &error_code);
 146             opkg_msg(hide_error?DEBUG2:ERROR, "Failed to download %s: %s.\n",
 147                     src, curl_easy_strerror(res));
 148             free(tmp_file_location);
 149             return -1;
 150         }
 151
 152     }
 153     else
 154     {
 155         free(tmp_file_location);
 156         return -1;
 157     }
 158 #else
 159     {
 160       int res;
 161       const char *argv[8];
 162       int i = 0;
 163
 164       argv[i++] = "wget";
 165       argv[i++] = "-q";
 166       if (conf->http_proxy || conf->ftp_proxy) {
 167         argv[i++] = "-Y";
 168         argv[i++] = "on";
 169       }
 170       argv[i++] = "-O";
 171       argv[i++] = tmp_file_location;
 172       argv[i++] = src;
 173       argv[i++] = NULL;
 174       res = xsystem(argv);
 175
 176       if (res) {
 177         opkg_msg(ERROR, "Failed to download %s, wget returned %d.\n", src, res);
 178         free(tmp_file_location);
 179         return -1;
 180       }
 181     }
 182 #endif
 183
 184     err = file_move(tmp_file_location, dest_file_name);
 185
 186     free(tmp_file_location);
 187
 188     return err;
 189 }
 190
 191 static int
 192 opkg_download_cache(const char *src, const char *dest_file_name,
 193         curl_progress_func cb, void *data)
 194 {
 195     char *cache_name = xstrdup(src);
 196     char *cache_location, *p;
 197     int err = 0;
 198
 199     if (!conf->cache || str_starts_with(src, "file:")) {
 200         err = opkg_download(src, dest_file_name, cb, data, 0);
 201         goto out1;
 202     }
 203
 204     if(!file_is_dir(conf->cache)){
 205             opkg_msg(ERROR, "%s is not a directory.\n",
 206                             conf->cache);
 207             err = 1;
 208             goto out1;
 209     }
 210
 211     for (p = cache_name; *p; p++)
 212         if (*p == '/')
 213             *p = ',';   /* looks nicer than | or # */
 214
 215     sprintf_alloc(&cache_location, "%s/%s", conf->cache, cache_name);
 216     if (file_exists(cache_location))
 217         opkg_msg(NOTICE, "Copying %s.\n", cache_location);
 218     else {
 219        /* cache file with funky name not found, try simple name */
 220         free(cache_name);
 221         char *filename = strrchr(dest_file_name,'/');
 222         if (filename)
 223            cache_name = xstrdup(filename+1); // strip leading '/'
 224         else
 225            cache_name = xstrdup(dest_file_name);
 226         free(cache_location);
 227         sprintf_alloc(&cache_location, "%s/%s", conf->cache, cache_name);
 228         if (file_exists(cache_location))
 229            opkg_msg(NOTICE, "Copying %s.\n", cache_location);
 230         else  {
 231             err = opkg_download(src, cache_location, cb, data, 0);
 232             if (err) {
 233                (void) unlink(cache_location);
 234                goto out2;
 235           }
 236         }
 237     }
 238
 239     err = file_copy(cache_location, dest_file_name);
 240
 241
 242 out2:
 243     free(cache_location);
 244 out1:
 245     free(cache_name);
 246     return err;
 247 }
 248
 249 int
 250 opkg_download_pkg(pkg_t *pkg, const char *dir)
 251 {
 252     int err;
 253     char *url;
 254     char *stripped_filename;
 255
 256     if (pkg->src == NULL) {
 257         opkg_msg(ERROR, "Package %s is not available from any configured src.\n",
 258                 pkg->name);
 259         return -1;
 260     }
 261     if (pkg->filename == NULL) {
 262         opkg_msg(ERROR, "Package %s does not have a valid filename field.\n",
 263                 pkg->name);
 264         return -1;
 265     }
 266
 267     sprintf_alloc(&url, "%s/%s", pkg->src->value, pkg->filename);
 268
 269     /* The pkg->filename might be something like
 270        "../../foo.opk". While this is correct, and exactly what we
 271        want to use to construct url above, here we actually need to
 272        use just the filename part, without any directory. */
 273
 274     stripped_filename = strrchr(pkg->filename, '/');
 275     if ( ! stripped_filename )
 276         stripped_filename = pkg->filename;
 277
 278     sprintf_alloc(&pkg->local_filename, "%s/%s", dir, stripped_filename);
 279
 280     err = opkg_download_cache(url, pkg->local_filename, NULL, NULL);
 281     free(url);
 282
 283     return err;
 284 }
 285
 286 /*
 287  * Downloads file from url, installs in package database, return package name.
 288  */
 289 int
 290 opkg_prepare_url_for_install(const char *url, char **namep)
 291 {
 292      int err = 0;
 293      pkg_t *pkg;
 294
 295      pkg = pkg_new();
 296
 297      if (str_starts_with(url, "http://")
 298          || str_starts_with(url, "ftp://")) {
 299           char *tmp_file;
 300           char *file_basec = xstrdup(url);
 301           char *file_base = basename(file_basec);
 302
 303           sprintf_alloc(&tmp_file, "%s/%s", conf->tmp_dir, file_base);
 304           err = opkg_download(url, tmp_file, NULL, NULL, 0);
 305           if (err)
 306                return err;
 307
 308           err = pkg_init_from_file(pkg, tmp_file);
 309           if (err)
 310                return err;
 311
 312           free(tmp_file);
 313           free(file_basec);
 314
 315      } else if (strcmp(&url[strlen(url) - 4], OPKG_PKG_EXTENSION) == 0
 316                 || strcmp(&url[strlen(url) - 4], IPKG_PKG_EXTENSION) == 0
 317                 || strcmp(&url[strlen(url) - 4], DPKG_PKG_EXTENSION) == 0) {
 318
 319           err = pkg_init_from_file(pkg, url);
 320           if (err)
 321                return err;
 322           opkg_msg(DEBUG2, "Package %s provided by hand (%s).\n",
 323                   pkg->name, pkg->local_filename);
 324           pkg->provided_by_hand = 1;
 325
 326      } else {
 327        pkg_deinit(pkg);
 328        free(pkg);
 329        return 0;
 330      }
 331
 332      pkg->dest = conf->default_dest;
 333      pkg->state_want = SW_INSTALL;
 334      pkg->state_flag |= SF_PREFER;
 335      hash_insert_pkg(pkg, 1);
 336
 337      if (namep) {
 338           *namep = xstrdup(pkg->name);
 339      }
 340      return 0;
 341 }
 342
 343 int
 344 opkg_verify_file (char *text_file, char *sig_file)
 345 {
 346 #if defined HAVE_USIGN
 347         int status = -1;
 348         int pid;
 349
 350     if (conf->check_signature == 0 )
 351         return 0;
 352
 353         pid = fork();
 354         if (pid < 0)
 355                 return -1;
 356
 357         if (!pid) {
 358                 execl("/usr/sbin/opkg-key", "opkg-key", "verify", sig_file, text_file, NULL);
 359                 exit(255);
 360         }
 361
 362         waitpid(pid, &status, 0);
 363         if (!WIFEXITED(status) || WEXITSTATUS(status))
 364                 return -1;
 365
 366         return 0;
 367 #elif defined HAVE_GPGME
 368     if (conf->check_signature == 0 )
 369         return 0;
 370     int status = -1;
 371     gpgme_ctx_t ctx;
 372     gpgme_data_t sig, text, key;
 373     gpgme_error_t err;
 374     gpgme_verify_result_t result;
 375     gpgme_signature_t s;
 376     char *trusted_path = NULL;
 377
 378     gpgme_check_version (NULL);
 379
 380     err = gpgme_new (&ctx);
 381
 382     if (err)
 383         return -1;
 384
 385     sprintf_alloc(&trusted_path, "%s/%s", conf->offline_root, "/etc/opkg/trusted.gpg");
 386     err = gpgme_data_new_from_file (&key, trusted_path, 1);
 387     free (trusted_path);
 388     if (err)
 389     {
 390       return -1;
 391     }
 392     err = gpgme_op_import (ctx, key);
 393     if (err)
 394     {
 395       gpgme_data_release (key);
 396       return -1;
 397     }
 398     gpgme_data_release (key);
 399
 400     err = gpgme_data_new_from_file (&sig, sig_file, 1);
 401     if (err)
 402     {
 403         gpgme_release (ctx);
 404         return -1;
 405     }
 406
 407     err = gpgme_data_new_from_file (&text, text_file, 1);
 408     if (err)
 409     {
 410         gpgme_data_release (sig);
 411         gpgme_release (ctx);
 412         return -1;
 413     }
 414
 415     err = gpgme_op_verify (ctx, sig, text, NULL);
 416
 417     result = gpgme_op_verify_result (ctx);
 418     if (!result)
 419         return -1;
 420
 421     /* see if any of the signitures matched */
 422     s = result->signatures;
 423     while (s)
 424     {
 425         status = gpg_err_code (s->status);
 426         if (status == GPG_ERR_NO_ERROR)
 427             break;
 428         s = s->next;
 429     }
 430
 431
 432     gpgme_data_release (sig);
 433     gpgme_data_release (text);
 434     gpgme_release (ctx);
 435
 436     return status;
 437 #elif defined HAVE_OPENSSL
 438     X509_STORE *store = NULL;
 439     PKCS7 *p7 = NULL;
 440     BIO *in = NULL, *indata = NULL;
 441
 442     // Sig check failed by default !
 443     int status = -1;
 444
 445     openssl_init();
 446
 447     // Set-up the key store
 448     if(!(store = setup_verify(conf->signature_ca_file, conf->signature_ca_path))){
 449         opkg_msg(ERROR, "Can't open CA certificates.\n");
 450         goto verify_file_end;
 451     }
 452
 453     // Open a BIO to read the sig file
 454     if (!(in = BIO_new_file(sig_file, "rb"))){
 455         opkg_msg(ERROR, "Can't open signature file %s.\n", sig_file);
 456         goto verify_file_end;
 457     }
 458
 459     // Read the PKCS7 block contained in the sig file
 460     p7 = PEM_read_bio_PKCS7(in, NULL, NULL, NULL);
 461     if(!p7){
 462         opkg_msg(ERROR, "Can't read signature file %s (Corrupted ?).\n",
 463                 sig_file);
 464         goto verify_file_end;
 465     }
 466 #if defined(HAVE_PATHFINDER)
 467     if(conf->check_x509_path){
 468         if(!pkcs7_pathfinder_verify_signers(p7)){
 469             opkg_msg(ERROR, "pkcs7_pathfinder_verify_signers: "
 470                     "Path verification failed.\n");
 471             goto verify_file_end;
 472         }
 473     }
 474 #endif
 475
 476     // Open the Package file to authenticate
 477     if (!(indata = BIO_new_file(text_file, "rb"))){
 478         opkg_msg(ERROR, "Can't open file %s.\n", text_file);
 479         goto verify_file_end;
 480     }
 481
 482     // Let's verify the autenticity !
 483     if (PKCS7_verify(p7, NULL, store, indata, NULL, PKCS7_BINARY) != 1){
 484         // Get Off My Lawn!
 485         opkg_msg(ERROR, "Verification failure.\n");
 486     }else{
 487         // Victory !
 488         status = 0;
 489     }
 490
 491 verify_file_end:
 492     BIO_free(in);
 493     BIO_free(indata);
 494     PKCS7_free(p7);
 495     X509_STORE_free(store);
 496
 497     return status;
 498 #else
 499     /* mute `unused variable' warnings. */
 500     (void) sig_file;
 501     (void) text_file;
 502     (void) conf;
 503     return 0;
 504 #endif
 505 }
 506
 507
 508 #if defined(HAVE_OPENSSL) || defined(HAVE_SSLCURL)
 509 static void openssl_init(void){
 510     static int init = 0;
 511
 512     if(!init){
 513         OPENSSL_config(NULL);
 514         OpenSSL_add_all_algorithms();
 515         ERR_load_crypto_strings();
 516         init = 1;
 517     }
 518 }
 519
 520 #endif
 521
 522
 523 #if defined HAVE_OPENSSL
 524 static X509_STORE *
 525 setup_verify(char *CAfile, char *CApath)
 526 {
 527     X509_STORE *store = NULL;
 528     X509_LOOKUP *lookup = NULL;
 529
 530     if(!(store = X509_STORE_new())){
 531         // Something bad is happening...
 532         goto end;
 533     }
 534
 535     // adds the X509 file lookup method
 536     lookup = X509_STORE_add_lookup(store,X509_LOOKUP_file());
 537     if (lookup == NULL){
 538         goto end;
 539     }
 540
 541     // Autenticating against one CA file
 542     if (CAfile) {
 543         if(!X509_LOOKUP_load_file(lookup,CAfile,X509_FILETYPE_PEM)) {
 544             // Invalid CA => Bye bye
 545             opkg_msg(ERROR, "Error loading file %s.\n", CAfile);
 546             goto end;
 547         }
 548     } else {
 549         X509_LOOKUP_load_file(lookup,NULL,X509_FILETYPE_DEFAULT);
 550     }
 551
 552     // Now look into CApath directory if supplied
 553     lookup = X509_STORE_add_lookup(store,X509_LOOKUP_hash_dir());
 554     if (lookup == NULL){
 555         goto end;
 556     }
 557
 558     if (CApath) {
 559         if(!X509_LOOKUP_add_dir(lookup,CApath,X509_FILETYPE_PEM)) {
 560             opkg_msg(ERROR, "Error loading directory %s.\n", CApath);
 561             goto end;
 562         }
 563     } else {
 564         X509_LOOKUP_add_dir(lookup,NULL,X509_FILETYPE_DEFAULT);
 565     }
 566
 567     // All right !
 568     ERR_clear_error();
 569     return store;
 570
 571 end:
 572
 573     X509_STORE_free(store);
 574     return NULL;
 575
 576 }
 577
 578 #endif
 579
 580 #ifdef HAVE_CURL
 581 void opkg_curl_cleanup(void){
 582     if(curl != NULL){
 583         curl_easy_cleanup (curl);
 584         curl = NULL;
 585     }
 586 }
 587
 588 static CURL *
 589 opkg_curl_init(curl_progress_func cb, void *data)
 590 {
 591
 592     if(curl == NULL){
 593         curl = curl_easy_init();
 594
 595 #ifdef HAVE_SSLCURL
 596         openssl_init();
 597
 598         if (conf->ssl_engine) {
 599
 600             /* use crypto engine */
 601             if (curl_easy_setopt(curl, CURLOPT_SSLENGINE, conf->ssl_engine) != CURLE_OK){
 602                 opkg_msg(ERROR, "Can't set crypto engine '%s'.\n",
 603                         conf->ssl_engine);
 604
 605                 opkg_curl_cleanup();
 606                 return NULL;
 607             }
 608             /* set the crypto engine as default */
 609             if (curl_easy_setopt(curl, CURLOPT_SSLENGINE_DEFAULT, 1L) != CURLE_OK){
 610                 opkg_msg(ERROR, "Can't set crypto engine '%s' as default.\n",
 611                         conf->ssl_engine);
 612
 613                 opkg_curl_cleanup();
 614                 return NULL;
 615             }
 616         }
 617
 618         /* cert & key can only be in PEM case in the same file */
 619         if(conf->ssl_key_passwd){
 620             if (curl_easy_setopt(curl, CURLOPT_SSLKEYPASSWD, conf->ssl_key_passwd) != CURLE_OK)
 621             {
 622                 opkg_msg(DEBUG, "Failed to set key password.\n");
 623             }
 624         }
 625
 626         /* sets the client certificate and its type */
 627         if(conf->ssl_cert_type){
 628             if (curl_easy_setopt(curl, CURLOPT_SSLCERTTYPE, conf->ssl_cert_type) != CURLE_OK)
 629             {
 630                 opkg_msg(DEBUG, "Failed to set certificate format.\n");
 631             }
 632         }
 633         /* SSL cert name isn't mandatory */
 634         if(conf->ssl_cert){
 635                 curl_easy_setopt(curl, CURLOPT_SSLCERT, conf->ssl_cert);
 636         }
 637
 638         /* sets the client key and its type */
 639         if(conf->ssl_key_type){
 640             if (curl_easy_setopt(curl, CURLOPT_SSLKEYTYPE, conf->ssl_key_type) != CURLE_OK)
 641             {
 642                 opkg_msg(DEBUG, "Failed to set key format.\n");
 643             }
 644         }
 645         if(conf->ssl_key){
 646             if (curl_easy_setopt(curl, CURLOPT_SSLKEY, conf->ssl_key) != CURLE_OK)
 647             {
 648                 opkg_msg(DEBUG, "Failed to set key.\n");
 649             }
 650         }
 651
 652         /* Should we verify the peer certificate ? */
 653         if(conf->ssl_dont_verify_peer){
 654             /*
 655              * CURLOPT_SSL_VERIFYPEER default is nonzero (curl => 7.10)
 656              */
 657             curl_easy_setopt(curl, CURLOPT_SSL_VERIFYPEER, 0);
 658         }else{
 659 #ifdef HAVE_PATHFINDER
 660             if(conf->check_x509_path){
 661                 if (curl_easy_setopt(curl, CURLOPT_SSL_CTX_FUNCTION, curl_ssl_ctx_function) != CURLE_OK){
 662                     opkg_msg(DEBUG, "Failed to set ssl path verification callback.\n");
 663                 }else{
 664                     curl_easy_setopt(curl, CURLOPT_SSL_CTX_DATA, NULL);
 665                 }
 666             }
 667 #endif
 668         }
 669
 670         /* certification authority file and/or path */
 671         if(conf->ssl_ca_file){
 672             curl_easy_setopt(curl, CURLOPT_CAINFO, conf->ssl_ca_file);
 673         }
 674         if(conf->ssl_ca_path){
 675             curl_easy_setopt(curl, CURLOPT_CAPATH, conf->ssl_ca_path);
 676         }
 677 #endif
 678
 679         curl_easy_setopt (curl, CURLOPT_FOLLOWLOCATION, 1);
 680         curl_easy_setopt (curl, CURLOPT_FAILONERROR, 1);
 681         if (conf->http_proxy || conf->ftp_proxy)
 682         {
 683             char *userpwd;
 684             sprintf_alloc (&userpwd, "%s:%s", conf->proxy_user,
 685                     conf->proxy_passwd);
 686             curl_easy_setopt(curl, CURLOPT_PROXYUSERPWD, userpwd);
 687             free (userpwd);
 688         }
 689     }
 690
 691     curl_easy_setopt (curl, CURLOPT_NOPROGRESS, (cb == NULL));
 692     if (cb)
 693     {
 694         curl_easy_setopt (curl, CURLOPT_PROGRESSDATA, data);
 695         curl_easy_setopt (curl, CURLOPT_PROGRESSFUNCTION, cb);
 696     }
 697
 698     return curl;
 699
 700 }
 701 #endif