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 #include "config.h"
  20
  21 #include "includes.h"
  22 #include "opkg_download.h"
  23 #include "opkg_message.h"
  24
  25 #include "sprintf_alloc.h"
  26 #include "xsystem.h"
  27 #include "file_util.h"
  28 #include "opkg_defines.h"
  29 #include "libbb/libbb.h"
  30
  31 #ifdef HAVE_CURL
  32 #include <curl/curl.h>
  33 #endif
  34
  35 #if defined(HAVE_SSLCURL) || defined(HAVE_OPENSSL)
  36 #include <openssl/conf.h>
  37 #include <openssl/evp.h>
  38 #include <openssl/err.h>
  39 #include <openssl/ssl.h>
  40 #endif
  41
  42 #if defined(HAVE_GPGME)
  43 #include <gpgme.h>
  44 #elif defined(HAVE_OPENSSL)
  45 #include <openssl/bio.h>
  46 #include <openssl/objects.h>
  47 #include <openssl/x509.h>
  48 #include <openssl/pem.h>
  49 #include <openssl/hmac.h>
  50 #endif
  51
  52 #ifdef HAVE_PATHFINDER
  53 #include "opkg_pathfinder.h"
  54 #endif
  55
  56 #if defined(HAVE_OPENSSL) || defined(HAVE_SSLCURL)
  57 static void openssl_init(void);
  58 #endif
  59
  60 #ifdef HAVE_OPENSSL
  61 static X509_STORE *setup_verify(opkg_conf_t *conf, char *CAfile, char *CApath);
  62 #endif
  63
  64 #ifdef HAVE_CURL
  65 /*
  66  * Make curl an instance variable so we don't have to instanciate it
  67  * each time
  68  */
  69 static CURL *curl = NULL;
  70 static CURL *opkg_curl_init(opkg_conf_t *conf, curl_progress_func cb, void *data);
  71 #endif
  72
  73 static int
  74 str_starts_with(const char *str, const char *prefix)
  75 {
  76     return (strncmp(str, prefix, strlen(prefix)) == 0);
  77 }
  78
  79 int opkg_download(opkg_conf_t *conf, const char *src,
  80   const char *dest_file_name, curl_progress_func cb, void *data)
  81 {
  82     int err = 0;
  83
  84     char *src_basec = xstrdup(src);
  85     char *src_base = basename(src_basec);
  86     char *tmp_file_location;
  87
  88     opkg_message(conf,OPKG_NOTICE,"Downloading %s\n", src);
  89
  90     if (str_starts_with(src, "file:")) {
  91         const char *file_src = src + 5;
  92         opkg_message(conf,OPKG_INFO,"Copying %s to %s...", file_src, dest_file_name);
  93         err = file_copy(file_src, dest_file_name);
  94         opkg_message(conf,OPKG_INFO,"Done\n");
  95         free(src_basec);
  96         return err;
  97     }
  98
  99     sprintf_alloc(&tmp_file_location, "%s/%s", conf->tmp_dir, src_base);
 100     err = unlink(tmp_file_location);
 101     if (err && errno != ENOENT) {
 102         opkg_message(conf,OPKG_ERROR, "%s: ERROR: failed to unlink %s: %s\n",
 103                 __FUNCTION__, tmp_file_location, strerror(errno));
 104         free(tmp_file_location);
 105         free(src_basec);
 106         return -1;
 107     }
 108
 109     if (conf->http_proxy) {
 110         opkg_message(conf,OPKG_DEBUG,"Setting environment variable: http_proxy = %s\n", conf->http_proxy);
 111         setenv("http_proxy", conf->http_proxy, 1);
 112     }
 113     if (conf->ftp_proxy) {
 114         opkg_message(conf,OPKG_DEBUG,"Setting environment variable: ftp_proxy = %s\n", conf->ftp_proxy);
 115         setenv("ftp_proxy", conf->ftp_proxy, 1);
 116     }
 117     if (conf->no_proxy) {
 118         opkg_message(conf,OPKG_DEBUG,"Setting environment variable: no_proxy = %s\n", conf->no_proxy);
 119         setenv("no_proxy", conf->no_proxy, 1);
 120     }
 121
 122 #ifdef HAVE_CURL
 123     CURLcode res;
 124     FILE * file = fopen (tmp_file_location, "w");
 125
 126     curl = opkg_curl_init (conf, cb, data);
 127     if (curl)
 128     {
 129         curl_easy_setopt (curl, CURLOPT_URL, src);
 130         curl_easy_setopt (curl, CURLOPT_WRITEDATA, file);
 131
 132         res = curl_easy_perform (curl);
 133         fclose (file);
 134         if (res)
 135         {
 136             long error_code;
 137             curl_easy_getinfo(curl, CURLINFO_RESPONSE_CODE, &error_code);
 138             opkg_message(conf, OPKG_ERROR, "Failed to download %s. \nerror detail: %s\n", src, curl_easy_strerror(res));
 139             free(tmp_file_location);
 140             free(src_basec);
 141             return res;
 142         }
 143
 144     }
 145     else
 146     {
 147         free(tmp_file_location);
 148         free(src_basec);
 149         return -1;
 150     }
 151 #else
 152     {
 153       int res;
 154       const char *argv[8];
 155       int i = 0;
 156
 157       argv[i++] = "wget";
 158       argv[i++] = "-q";
 159       if (conf->http_proxy || conf->ftp_proxy) {
 160         argv[i++] = "-Y";
 161         argv[i++] = "on";
 162       }
 163       argv[i++] = "-O";
 164       argv[i++] = tmp_file_location;
 165       argv[i++] = src;
 166       argv[i++] = NULL;
 167       res = xsystem(argv);
 168
 169       if (res) {
 170         opkg_message(conf, OPKG_ERROR, "Failed to download %s, error %d\n", src, res);
 171         free(tmp_file_location);
 172         free(src_basec);
 173         return res;
 174       }
 175     }
 176 #endif
 177
 178     err = file_move(tmp_file_location, dest_file_name);
 179
 180     free(tmp_file_location);
 181     free(src_basec);
 182
 183     return err;
 184 }
 185
 186 static int opkg_download_cache(opkg_conf_t *conf, const char *src,
 187   const char *dest_file_name, curl_progress_func cb, void *data)
 188 {
 189     char *cache_name = xstrdup(src);
 190     char *cache_location, *p;
 191     int err = 0;
 192
 193     if (!conf->cache || str_starts_with(src, "file:")) {
 194         err = opkg_download(conf, src, dest_file_name, cb, data);
 195         goto out1;
 196     }
 197
 198     for (p = cache_name; *p; p++)
 199         if (*p == '/')
 200             *p = ',';   /* looks nicer than | or # */
 201
 202     sprintf_alloc(&cache_location, "%s/%s", conf->cache, cache_name);
 203     if (file_exists(cache_location))
 204         opkg_message(conf, OPKG_NOTICE, "Copying %s\n", cache_location);
 205     else {
 206         err = opkg_download(conf, src, cache_location, cb, data);
 207         if (err) {
 208             (void) unlink(cache_location);
 209             goto out2;
 210         }
 211     }
 212
 213     err = file_copy(cache_location, dest_file_name);
 214
 215
 216 out2:
 217     free(cache_location);
 218 out1:
 219     free(cache_name);
 220     return err;
 221 }
 222
 223 int opkg_download_pkg(opkg_conf_t *conf, pkg_t *pkg, const char *dir)
 224 {
 225     int err;
 226     char *url;
 227     char *stripped_filename;
 228
 229     if (pkg->src == NULL) {
 230         opkg_message(conf,OPKG_ERROR, "ERROR: Package %s (parent %s) is not available from any configured src.\n",
 231                 pkg->name, pkg->parent->name);
 232         return -1;
 233     }
 234     if (pkg->filename == NULL) {
 235         opkg_message(conf,OPKG_ERROR, "ERROR: Package %s (parent %s) does not have a valid filename field.\n",pkg->name, pkg->parent->name);
 236         return -1;
 237     }
 238
 239     sprintf_alloc(&url, "%s/%s", pkg->src->value, pkg->filename);
 240
 241     /* XXX: BUG: The pkg->filename might be something like
 242        "../../foo.opk". While this is correct, and exactly what we
 243        want to use to construct url above, here we actually need to
 244        use just the filename part, without any directory. */
 245
 246     stripped_filename = strrchr(pkg->filename, '/');
 247     if ( ! stripped_filename )
 248         stripped_filename = pkg->filename;
 249
 250     sprintf_alloc(&pkg->local_filename, "%s/%s", dir, stripped_filename);
 251
 252     err = opkg_download_cache(conf, url, pkg->local_filename, NULL, NULL);
 253     free(url);
 254
 255     return err;
 256 }
 257
 258 /*
 259  * Downloads file from url, installs in package database, return package name.
 260  */
 261 int opkg_prepare_url_for_install(opkg_conf_t *conf, const char *url, char **namep)
 262 {
 263      int err = 0;
 264      pkg_t *pkg;
 265
 266      pkg = pkg_new();
 267
 268      if (str_starts_with(url, "http://")
 269          || str_starts_with(url, "ftp://")) {
 270           char *tmp_file;
 271           char *file_basec = xstrdup(url);
 272           char *file_base = basename(file_basec);
 273
 274           sprintf_alloc(&tmp_file, "%s/%s", conf->tmp_dir, file_base);
 275           err = opkg_download(conf, url, tmp_file, NULL, NULL);
 276           if (err)
 277                return err;
 278
 279           err = pkg_init_from_file(conf, pkg, tmp_file);
 280           if (err)
 281                return err;
 282
 283           free(tmp_file);
 284           free(file_basec);
 285
 286      } else if (strcmp(&url[strlen(url) - 4], OPKG_PKG_EXTENSION) == 0
 287                 || strcmp(&url[strlen(url) - 4], IPKG_PKG_EXTENSION) == 0
 288                 || strcmp(&url[strlen(url) - 4], DPKG_PKG_EXTENSION) == 0) {
 289
 290           err = pkg_init_from_file(conf, pkg, url);
 291           if (err)
 292                return err;
 293           opkg_message(conf, OPKG_DEBUG2, "Package %s provided by hand (%s).\n", pkg->name,pkg->local_filename);
 294           pkg->provided_by_hand = 1;
 295
 296      } else {
 297        pkg_deinit(pkg);
 298        free(pkg);
 299        return 0;
 300      }
 301
 302      if (!pkg->architecture) {
 303           opkg_message(conf, OPKG_ERROR, "Package %s has no Architecture defined.\n", pkg->name);
 304           return -1;
 305      }
 306
 307      pkg->dest = conf->default_dest;
 308      pkg->state_want = SW_INSTALL;
 309      pkg->state_flag |= SF_PREFER;
 310      pkg = hash_insert_pkg(&conf->pkg_hash, pkg, 1,conf);
 311
 312      if (namep) {
 313           *namep = pkg->name;
 314      }
 315      return 0;
 316 }
 317
 318 int
 319 opkg_verify_file (opkg_conf_t *conf, char *text_file, char *sig_file)
 320 {
 321 #if defined HAVE_GPGME
 322     if (conf->check_signature == 0 )
 323         return 0;
 324     int status = -1;
 325     gpgme_ctx_t ctx;
 326     gpgme_data_t sig, text, key;
 327     gpgme_error_t err = -1;
 328     gpgme_verify_result_t result;
 329     gpgme_signature_t s;
 330     char *trusted_path = NULL;
 331
 332     err = gpgme_new (&ctx);
 333
 334     if (err)
 335         return -1;
 336
 337     sprintf_alloc(&trusted_path, "%s/%s", conf->offline_root, "/etc/opkg/trusted.gpg");
 338     err = gpgme_data_new_from_file (&key, trusted_path, 1);
 339     free (trusted_path);
 340     if (err)
 341     {
 342       return -1;
 343     }
 344     err = gpgme_op_import (ctx, key);
 345     if (err)
 346     {
 347       gpgme_data_release (key);
 348       return -1;
 349     }
 350     gpgme_data_release (key);
 351
 352     err = gpgme_data_new_from_file (&sig, sig_file, 1);
 353     if (err)
 354     {
 355         gpgme_release (ctx);
 356         return -1;
 357     }
 358
 359     err = gpgme_data_new_from_file (&text, text_file, 1);
 360     if (err)
 361     {
 362         gpgme_data_release (sig);
 363         gpgme_release (ctx);
 364         return -1;
 365     }
 366
 367     err = gpgme_op_verify (ctx, sig, text, NULL);
 368
 369     result = gpgme_op_verify_result (ctx);
 370     if (!result)
 371         return -1;
 372
 373     /* see if any of the signitures matched */
 374     s = result->signatures;
 375     while (s)
 376     {
 377         status = gpg_err_code (s->status);
 378         if (status == GPG_ERR_NO_ERROR)
 379             break;
 380         s = s->next;
 381     }
 382
 383
 384     gpgme_data_release (sig);
 385     gpgme_data_release (text);
 386     gpgme_release (ctx);
 387
 388     return status;
 389 #elif defined HAVE_OPENSSL
 390     X509_STORE *store = NULL;
 391     PKCS7 *p7 = NULL;
 392     BIO *in = NULL, *indata = NULL;
 393
 394     // Sig check failed by default !
 395     int status = -1;
 396
 397     openssl_init();
 398
 399     // Set-up the key store
 400     if(!(store = setup_verify(conf, conf->signature_ca_file, conf->signature_ca_path))){
 401         opkg_message(conf, OPKG_ERROR,
 402                 "Can't open CA certificates\n");
 403         goto verify_file_end;
 404     }
 405
 406     // Open a BIO to read the sig file
 407     if (!(in = BIO_new_file(sig_file, "rb"))){
 408         opkg_message(conf, OPKG_ERROR,
 409                 "Can't open signature file %s\n", sig_file);
 410         goto verify_file_end;
 411     }
 412
 413     // Read the PKCS7 block contained in the sig file
 414     p7 = PEM_read_bio_PKCS7(in, NULL, NULL, NULL);
 415     if(!p7){
 416         opkg_message(conf, OPKG_ERROR,
 417                 "Can't read signature file (Corrupted ?)\n");
 418         goto verify_file_end;
 419     }
 420 #if defined(HAVE_PATHFINDER)
 421     if(conf->check_x509_path){
 422         if(!pkcs7_pathfinder_verify_signers(p7)){
 423             opkg_message(conf,  OPKG_ERROR, "pkcs7_pathfinder_verify_signers: "
 424                     "Path verification failed\n");
 425             goto verify_file_end;
 426         }
 427     }
 428 #endif
 429
 430     // Open the Package file to authenticate
 431     if (!(indata = BIO_new_file(text_file, "rb"))){
 432         opkg_message(conf, OPKG_ERROR,
 433                 "Can't open file %s\n", text_file);
 434         goto verify_file_end;
 435     }
 436
 437     // Let's verify the autenticity !
 438     if (PKCS7_verify(p7, NULL, store, indata, NULL, PKCS7_BINARY) != 1){
 439         // Get Off My Lawn!
 440         opkg_message(conf, OPKG_ERROR,
 441                 "Verification failure\n");
 442     }else{
 443         // Victory !
 444         status = 0;
 445     }
 446
 447 verify_file_end:
 448     BIO_free(in);
 449     BIO_free(indata);
 450     PKCS7_free(p7);
 451     X509_STORE_free(store);
 452
 453     return status;
 454 #else
 455     /* mute `unused variable' warnings. */
 456     (void) sig_file;
 457     (void) text_file;
 458     (void) conf;
 459     return 0;
 460 #endif
 461 }
 462
 463
 464 #if defined(HAVE_OPENSSL) || defined(HAVE_SSLCURL)
 465 static void openssl_init(void){
 466     static int init = 0;
 467
 468     if(!init){
 469         OPENSSL_config(NULL);
 470         OpenSSL_add_all_algorithms();
 471         ERR_load_crypto_strings();
 472         init = 1;
 473     }
 474 }
 475
 476 #endif
 477
 478
 479 #if defined HAVE_OPENSSL
 480 static X509_STORE *setup_verify(opkg_conf_t *conf, char *CAfile, char *CApath){
 481     X509_STORE *store = NULL;
 482     X509_LOOKUP *lookup = NULL;
 483
 484     if(!(store = X509_STORE_new())){
 485         // Something bad is happening...
 486         goto end;
 487     }
 488
 489     // adds the X509 file lookup method
 490     lookup = X509_STORE_add_lookup(store,X509_LOOKUP_file());
 491     if (lookup == NULL){
 492         goto end;
 493     }
 494
 495     // Autenticating against one CA file
 496     if (CAfile) {
 497         if(!X509_LOOKUP_load_file(lookup,CAfile,X509_FILETYPE_PEM)) {
 498             // Invalid CA => Bye bye
 499             opkg_message(conf, OPKG_ERROR,
 500                     "Error loading file %s\n", CAfile);
 501             goto end;
 502         }
 503     } else {
 504         X509_LOOKUP_load_file(lookup,NULL,X509_FILETYPE_DEFAULT);
 505     }
 506
 507     // Now look into CApath directory if supplied
 508     lookup = X509_STORE_add_lookup(store,X509_LOOKUP_hash_dir());
 509     if (lookup == NULL){
 510         goto end;
 511     }
 512
 513     if (CApath) {
 514         if(!X509_LOOKUP_add_dir(lookup,CApath,X509_FILETYPE_PEM)) {
 515             opkg_message(conf, OPKG_ERROR,
 516                     "Error loading directory %s\n", CApath);
 517             goto end;
 518         }
 519     } else {
 520         X509_LOOKUP_add_dir(lookup,NULL,X509_FILETYPE_DEFAULT);
 521     }
 522
 523     // All right !
 524     ERR_clear_error();
 525     return store;
 526
 527 end:
 528
 529     X509_STORE_free(store);
 530     return NULL;
 531
 532 }
 533
 534 #endif
 535
 536 #ifdef HAVE_CURL
 537 void opkg_curl_cleanup(void){
 538     if(curl != NULL){
 539         curl_easy_cleanup (curl);
 540         curl = NULL;
 541     }
 542 }
 543
 544 static CURL *opkg_curl_init(opkg_conf_t *conf, curl_progress_func cb, void *data){
 545
 546     if(curl == NULL){
 547         curl = curl_easy_init();
 548
 549 #ifdef HAVE_SSLCURL
 550         openssl_init();
 551
 552         if (conf->ssl_engine) {
 553
 554             /* use crypto engine */
 555             if (curl_easy_setopt(curl, CURLOPT_SSLENGINE, conf->ssl_engine) != CURLE_OK){
 556                 opkg_message(conf, OPKG_ERROR, "can't set crypto engine: '%s'\n",
 557                         conf->ssl_engine);
 558
 559                 opkg_curl_cleanup();
 560                 return NULL;
 561             }
 562             /* set the crypto engine as default */
 563             if (curl_easy_setopt(curl, CURLOPT_SSLENGINE_DEFAULT, 1L) != CURLE_OK){
 564                 opkg_message(conf, OPKG_ERROR, "can't set crypto engine as default\n");
 565
 566                 opkg_curl_cleanup();
 567                 return NULL;
 568             }
 569         }
 570
 571         /* cert & key can only be in PEM case in the same file */
 572         if(conf->ssl_key_passwd){
 573             if (curl_easy_setopt(curl, CURLOPT_SSLKEYPASSWD, conf->ssl_key_passwd) != CURLE_OK)
 574             {
 575                 opkg_message(conf, OPKG_DEBUG, "Failed to set key password\n");
 576             }
 577         }
 578
 579         /* sets the client certificate and its type */
 580         if(conf->ssl_cert_type){
 581             if (curl_easy_setopt(curl, CURLOPT_SSLCERTTYPE, conf->ssl_cert_type) != CURLE_OK)
 582             {
 583                 opkg_message(conf, OPKG_DEBUG, "Failed to set certificate format\n");
 584             }
 585         }
 586         /* SSL cert name isn't mandatory */
 587         if(conf->ssl_cert){
 588                 curl_easy_setopt(curl, CURLOPT_SSLCERT, conf->ssl_cert);
 589         }
 590
 591         /* sets the client key and its type */
 592         if(conf->ssl_key_type){
 593             if (curl_easy_setopt(curl, CURLOPT_SSLKEYTYPE, conf->ssl_key_type) != CURLE_OK)
 594             {
 595                 opkg_message(conf, OPKG_DEBUG, "Failed to set key format\n");
 596             }
 597         }
 598         if(conf->ssl_key){
 599             if (curl_easy_setopt(curl, CURLOPT_SSLKEY, conf->ssl_key) != CURLE_OK)
 600             {
 601                 opkg_message(conf, OPKG_DEBUG, "Failed to set key\n");
 602             }
 603         }
 604
 605         /* Should we verify the peer certificate ? */
 606         if(conf->ssl_dont_verify_peer){
 607             /*
 608              * CURLOPT_SSL_VERIFYPEER default is nonzero (curl => 7.10)
 609              */
 610             curl_easy_setopt(curl, CURLOPT_SSL_VERIFYPEER, 0);
 611         }else{
 612 #ifdef HAVE_PATHFINDER
 613             if(conf->check_x509_path){
 614                 if (curl_easy_setopt(curl, CURLOPT_SSL_CTX_FUNCTION, curl_ssl_ctx_function) != CURLE_OK){
 615                     opkg_message(conf, OPKG_DEBUG, "Failed to set ssl path verification callback\n");
 616                 }else{
 617                     curl_easy_setopt(curl, CURLOPT_SSL_CTX_DATA, NULL);
 618                 }
 619             }
 620 #endif
 621         }
 622
 623         /* certification authority file and/or path */
 624         if(conf->ssl_ca_file){
 625             curl_easy_setopt(curl, CURLOPT_CAINFO, conf->ssl_ca_file);
 626         }
 627         if(conf->ssl_ca_path){
 628             curl_easy_setopt(curl, CURLOPT_CAPATH, conf->ssl_ca_path);
 629         }
 630 #endif
 631
 632         curl_easy_setopt (curl, CURLOPT_FOLLOWLOCATION, 1);
 633         curl_easy_setopt (curl, CURLOPT_FAILONERROR, 1);
 634         if (conf->http_proxy || conf->ftp_proxy)
 635         {
 636             char *userpwd;
 637             sprintf_alloc (&userpwd, "%s:%s", conf->proxy_user,
 638                     conf->proxy_passwd);
 639             curl_easy_setopt(curl, CURLOPT_PROXYUSERPWD, userpwd);
 640             free (userpwd);
 641         }
 642     }
 643
 644     curl_easy_setopt (curl, CURLOPT_NOPROGRESS, (cb == NULL));
 645     if (cb)
 646     {
 647         curl_easy_setopt (curl, CURLOPT_PROGRESSDATA, data);
 648         curl_easy_setopt (curl, CURLOPT_PROGRESSFUNCTION, cb);
 649     }
 650
 651     return curl;
 652
 653 }
 654 #endif