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