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 #ifdef HAVE_CURL
  22 #include <curl/curl.h>
  23 #endif
  24
  25 #if defined(HAVE_SSLCURL) || defined(HAVE_OPENSSL)
  26 #include <openssl/conf.h>
  27 #include <openssl/evp.h>
  28 #include <openssl/err.h>
  29 #include <openssl/ssl.h>
  30 #endif
  31
  32 #if defined(HAVE_GPGME)
  33 #include <gpgme.h>
  34 #elif defined(HAVE_OPENSSL)
  35 #include <openssl/bio.h>
  36 #include <openssl/objects.h>
  37 #include <openssl/x509.h>
  38 #include <openssl/pem.h>
  39 #include <openssl/hmac.h>
  40 #endif
  41
  42 #include "includes.h"
  43 #include "opkg_download.h"
  44 #include "opkg_message.h"
  45
  46 #include "sprintf_alloc.h"
  47 #include "xsystem.h"
  48 #include "file_util.h"
  49 #include "opkg_defines.h"
  50 #include "libbb/libbb.h"
  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         int ret;
  92         const char *file_src = src + 5;
  93         opkg_message(conf,OPKG_INFO,"Copying %s to %s...", file_src, dest_file_name);
  94         ret = file_copy(src + 5, dest_file_name);
  95         opkg_message(conf,OPKG_INFO,"Done\n");
  96         free(src_basec);
  97         return ret;
  98     }
  99
 100     sprintf_alloc(&tmp_file_location, "%s/%s", conf->tmp_dir, src_base);
 101     err = unlink(tmp_file_location);
 102     if (err && errno != ENOENT) {
 103         opkg_message(conf,OPKG_ERROR, "%s: ERROR: failed to unlink %s: %s\n",
 104                 __FUNCTION__, tmp_file_location, strerror(errno));
 105         free(tmp_file_location);
 106         free(src_basec);
 107         return errno;
 108     }
 109
 110     if (conf->http_proxy) {
 111         opkg_message(conf,OPKG_DEBUG,"Setting environment variable: http_proxy = %s\n", conf->http_proxy);
 112         setenv("http_proxy", conf->http_proxy, 1);
 113     }
 114     if (conf->ftp_proxy) {
 115         opkg_message(conf,OPKG_DEBUG,"Setting environment variable: ftp_proxy = %s\n", conf->ftp_proxy);
 116         setenv("ftp_proxy", conf->ftp_proxy, 1);
 117     }
 118     if (conf->no_proxy) {
 119         opkg_message(conf,OPKG_DEBUG,"Setting environment variable: no_proxy = %s\n", conf->no_proxy);
 120         setenv("no_proxy", conf->no_proxy, 1);
 121     }
 122
 123 #ifdef HAVE_CURL
 124     CURLcode res;
 125     FILE * file = fopen (tmp_file_location, "w");
 126
 127     curl = opkg_curl_init (conf, cb, data);
 128     if (curl)
 129     {
 130         curl_easy_setopt (curl, CURLOPT_URL, src);
 131         curl_easy_setopt (curl, CURLOPT_WRITEDATA, file);
 132
 133         res = curl_easy_perform (curl);
 134         fclose (file);
 135         if (res)
 136         {
 137             long error_code;
 138             curl_easy_getinfo(curl, CURLINFO_RESPONSE_CODE, &error_code);
 139             opkg_message(conf, OPKG_ERROR, "Failed to download %s. \nerror detail: %s\n", src, curl_easy_strerror(res));
 140             free(tmp_file_location);
 141             free(src_basec);
 142             return res;
 143         }
 144
 145     }
 146     else
 147     {
 148         free(tmp_file_location);
 149         free(src_basec);
 150         return -1;
 151     }
 152 #else
 153     {
 154       int res;
 155       const char *argv[8];
 156       int i = 0;
 157
 158       argv[i++] = "wget";
 159       argv[i++] = "-q";
 160       if (conf->http_proxy || conf->ftp_proxy) {
 161         argv[i++] = "-Y";
 162         argv[i++] = "on";
 163       }
 164       argv[i++] = "-O";
 165       argv[i++] = tmp_file_location;
 166       argv[i++] = src;
 167       argv[i++] = NULL;
 168       res = xsystem(argv);
 169
 170       if (res) {
 171         opkg_message(conf, OPKG_ERROR, "Failed to download %s, error %d\n", src, res);
 172         free(tmp_file_location);
 173         free(src_basec);
 174         return res;
 175       }
 176     }
 177 #endif
 178
 179     err = file_move(tmp_file_location, dest_file_name);
 180
 181     free(tmp_file_location);
 182     free(src_basec);
 183
 184     if (err) {
 185         return err;
 186     }
 187
 188     return 0;
 189 }
 190
 191 static int opkg_download_cache(opkg_conf_t *conf, const char *src,
 192   const char *dest_file_name, 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(conf, src, dest_file_name, cb, data);
 200         goto out1;
 201     }
 202
 203     for (p = cache_name; *p; p++)
 204         if (*p == '/')
 205             *p = ',';   /* looks nicer than | or # */
 206
 207     sprintf_alloc(&cache_location, "%s/%s", conf->cache, cache_name);
 208     if (file_exists(cache_location))
 209         opkg_message(conf, OPKG_NOTICE, "Copying %s\n", cache_location);
 210     else {
 211         err = opkg_download(conf, src, cache_location, cb, data);
 212         if (err) {
 213             (void) unlink(cache_location);
 214             goto out2;
 215         }
 216     }
 217
 218     err = file_copy(cache_location, dest_file_name);
 219
 220
 221 out2:
 222     free(cache_location);
 223 out1:
 224     free(cache_name);
 225     return err;
 226 }
 227
 228 int opkg_download_pkg(opkg_conf_t *conf, pkg_t *pkg, const char *dir)
 229 {
 230     int err;
 231     char *url;
 232     char *stripped_filename;
 233
 234     if (pkg->src == NULL) {
 235         opkg_message(conf,OPKG_ERROR, "ERROR: Package %s (parent %s) is not available from any configured src.\n",
 236                 pkg->name, pkg->parent->name);
 237         return -1;
 238     }
 239     if (pkg->filename == NULL) {
 240         opkg_message(conf,OPKG_ERROR, "ERROR: Package %s (parent %s) does not have a valid filename field.\n",pkg->name, pkg->parent->name);
 241         return -1;
 242     }
 243
 244     sprintf_alloc(&url, "%s/%s", pkg->src->value, pkg->filename);
 245
 246     /* XXX: BUG: The pkg->filename might be something like
 247        "../../foo.opk". While this is correct, and exactly what we
 248        want to use to construct url above, here we actually need to
 249        use just the filename part, without any directory. */
 250
 251     stripped_filename = strrchr(pkg->filename, '/');
 252     if ( ! stripped_filename )
 253         stripped_filename = pkg->filename;
 254
 255     sprintf_alloc(&pkg->local_filename, "%s/%s", dir, stripped_filename);
 256
 257     err = opkg_download_cache(conf, url, pkg->local_filename, NULL, NULL);
 258     free(url);
 259
 260     return err;
 261 }
 262
 263 /*
 264  * Downloads file from url, installs in package database, return package name.
 265  */
 266 int opkg_prepare_url_for_install(opkg_conf_t *conf, const char *url, char **namep)
 267 {
 268      int err = 0;
 269      pkg_t *pkg;
 270
 271      pkg = pkg_new();
 272
 273      if (str_starts_with(url, "http://")
 274          || str_starts_with(url, "ftp://")) {
 275           char *tmp_file;
 276           char *file_basec = xstrdup(url);
 277           char *file_base = basename(file_basec);
 278
 279           sprintf_alloc(&tmp_file, "%s/%s", conf->tmp_dir, file_base);
 280           err = opkg_download(conf, url, tmp_file, NULL, NULL);
 281           if (err)
 282                return err;
 283
 284           err = pkg_init_from_file(conf, pkg, tmp_file);
 285           if (err)
 286                return err;
 287
 288           free(tmp_file);
 289           free(file_basec);
 290
 291      } else if (strcmp(&url[strlen(url) - 4], OPKG_PKG_EXTENSION) == 0
 292                 || strcmp(&url[strlen(url) - 4], IPKG_PKG_EXTENSION) == 0
 293                 || strcmp(&url[strlen(url) - 4], DPKG_PKG_EXTENSION) == 0) {
 294
 295           err = pkg_init_from_file(conf, pkg, url);
 296           if (err)
 297                return err;
 298           opkg_message(conf, OPKG_DEBUG2, "Package %s provided by hand (%s).\n", pkg->name,pkg->local_filename);
 299           pkg->provided_by_hand = 1;
 300
 301      } else {
 302        pkg_deinit(pkg);
 303        free(pkg);
 304        return 0;
 305      }
 306
 307      if (!pkg->architecture) {
 308           opkg_message(conf, OPKG_ERROR, "Package %s has no Architecture defined.\n", pkg->name);
 309           return -EINVAL;
 310      }
 311
 312      pkg->dest = conf->default_dest;
 313      pkg->state_want = SW_INSTALL;
 314      pkg->state_flag |= SF_PREFER;
 315      pkg = hash_insert_pkg(&conf->pkg_hash, pkg, 1,conf);
 316
 317      if (namep) {
 318           *namep = pkg->name;
 319      }
 320      return 0;
 321 }
 322
 323 int
 324 opkg_verify_file (opkg_conf_t *conf, char *text_file, char *sig_file)
 325 {
 326 #if defined HAVE_GPGME
 327     if (conf->check_signature == 0 )
 328         return 0;
 329     int status = -1;
 330     gpgme_ctx_t ctx;
 331     gpgme_data_t sig, text, key;
 332     gpgme_error_t err = -1;
 333     gpgme_verify_result_t result;
 334     gpgme_signature_t s;
 335     char *trusted_path = NULL;
 336
 337     err = gpgme_new (&ctx);
 338
 339     if (err)
 340         return -1;
 341
 342     sprintf_alloc(&trusted_path, "%s/%s", conf->offline_root, "/etc/opkg/trusted.gpg");
 343     err = gpgme_data_new_from_file (&key, trusted_path, 1);
 344     free (trusted_path);
 345     if (err)
 346     {
 347       return -1;
 348     }
 349     err = gpgme_op_import (ctx, key);
 350     if (err)
 351     {
 352       gpgme_data_release (key);
 353       return -1;
 354     }
 355     gpgme_data_release (key);
 356
 357     err = gpgme_data_new_from_file (&sig, sig_file, 1);
 358     if (err)
 359     {
 360         gpgme_release (ctx);
 361         return -1;
 362     }
 363
 364     err = gpgme_data_new_from_file (&text, text_file, 1);
 365     if (err)
 366     {
 367         gpgme_data_release (sig);
 368         gpgme_release (ctx);
 369         return -1;
 370     }
 371
 372     err = gpgme_op_verify (ctx, sig, text, NULL);
 373
 374     result = gpgme_op_verify_result (ctx);
 375     if (!result)
 376         return -1;
 377
 378     /* see if any of the signitures matched */
 379     s = result->signatures;
 380     while (s)
 381     {
 382         status = gpg_err_code (s->status);
 383         if (status == GPG_ERR_NO_ERROR)
 384             break;
 385         s = s->next;
 386     }
 387
 388
 389     gpgme_data_release (sig);
 390     gpgme_data_release (text);
 391     gpgme_release (ctx);
 392
 393     return status;
 394 #elif defined HAVE_OPENSSL
 395     X509_STORE *store = NULL;
 396     PKCS7 *p7 = NULL;
 397     BIO *in = NULL, *indata = NULL;
 398
 399     // Sig check failed by default !
 400     int status = -1;
 401
 402     openssl_init();
 403
 404     // Set-up the key store
 405     if(!(store = setup_verify(conf, conf->signature_ca_file, conf->signature_ca_path))){
 406         opkg_message(conf, OPKG_ERROR,
 407                 "Can't open CA certificates\n");
 408         goto verify_file_end;
 409     }
 410
 411     // Open a BIO to read the sig file
 412     if (!(in = BIO_new_file(sig_file, "rb"))){
 413         opkg_message(conf, OPKG_ERROR,
 414                 "Can't open signature file %s\n", sig_file);
 415         goto verify_file_end;
 416     }
 417
 418     // Read the PKCS7 block contained in the sig file
 419     p7 = PEM_read_bio_PKCS7(in, NULL, NULL, NULL);
 420     if(!p7){
 421         opkg_message(conf, OPKG_ERROR,
 422                 "Can't read signature file (Corrupted ?)\n");
 423         goto verify_file_end;
 424     }
 425 #if defined(HAVE_PATHFINDER)
 426     if(conf->check_x509_path){
 427         if(!pkcs7_pathfinder_verify_signers(p7)){
 428             opkg_message(conf,  OPKG_ERROR, "pkcs7_pathfinder_verify_signers: "
 429                     "Path verification failed\n");
 430             goto verify_file_end;
 431         }
 432     }
 433 #endif
 434
 435     // Open the Package file to authenticate
 436     if (!(indata = BIO_new_file(text_file, "rb"))){
 437         opkg_message(conf, OPKG_ERROR,
 438                 "Can't open file %s\n", text_file);
 439         goto verify_file_end;
 440     }
 441
 442     // Let's verify the autenticity !
 443     if (PKCS7_verify(p7, NULL, store, indata, NULL, PKCS7_BINARY) != 1){
 444         // Get Off My Lawn!
 445         opkg_message(conf, OPKG_ERROR,
 446                 "Verification failure\n");
 447     }else{
 448         // Victory !
 449         status = 0;
 450     }
 451
 452 verify_file_end:
 453     BIO_free(in);
 454     BIO_free(indata);
 455     PKCS7_free(p7);
 456     X509_STORE_free(store);
 457
 458     return status;
 459 #else
 460     /* mute `unused variable' warnings. */
 461     (void) sig_file;
 462     (void) text_file;
 463     (void) conf;
 464     return 0;
 465 #endif
 466 }
 467
 468
 469 #if defined(HAVE_OPENSSL) || defined(HAVE_SSLCURL)
 470 static void openssl_init(void){
 471     static int init = 0;
 472
 473     if(!init){
 474         OPENSSL_config(NULL);
 475         OpenSSL_add_all_algorithms();
 476         ERR_load_crypto_strings();
 477         init = 1;
 478     }
 479 }
 480
 481 #endif
 482
 483
 484 #if defined HAVE_OPENSSL
 485 static X509_STORE *setup_verify(opkg_conf_t *conf, char *CAfile, char *CApath){
 486     X509_STORE *store = NULL;
 487     X509_LOOKUP *lookup = NULL;
 488
 489     if(!(store = X509_STORE_new())){
 490         // Something bad is happening...
 491         goto end;
 492     }
 493
 494     // adds the X509 file lookup method
 495     lookup = X509_STORE_add_lookup(store,X509_LOOKUP_file());
 496     if (lookup == NULL){
 497         goto end;
 498     }
 499
 500     // Autenticating against one CA file
 501     if (CAfile) {
 502         if(!X509_LOOKUP_load_file(lookup,CAfile,X509_FILETYPE_PEM)) {
 503             // Invalid CA => Bye bye
 504             opkg_message(conf, OPKG_ERROR,
 505                     "Error loading file %s\n", CAfile);
 506             goto end;
 507         }
 508     } else {
 509         X509_LOOKUP_load_file(lookup,NULL,X509_FILETYPE_DEFAULT);
 510     }
 511
 512     // Now look into CApath directory if supplied
 513     lookup = X509_STORE_add_lookup(store,X509_LOOKUP_hash_dir());
 514     if (lookup == NULL){
 515         goto end;
 516     }
 517
 518     if (CApath) {
 519         if(!X509_LOOKUP_add_dir(lookup,CApath,X509_FILETYPE_PEM)) {
 520             opkg_message(conf, OPKG_ERROR,
 521                     "Error loading directory %s\n", CApath);
 522             goto end;
 523         }
 524     } else {
 525         X509_LOOKUP_add_dir(lookup,NULL,X509_FILETYPE_DEFAULT);
 526     }
 527
 528     // All right !
 529     ERR_clear_error();
 530     return store;
 531
 532 end:
 533
 534     X509_STORE_free(store);
 535     return NULL;
 536
 537 }
 538
 539 #endif
 540
 541 #ifdef HAVE_CURL
 542 void opkg_curl_cleanup(void){
 543     if(curl != NULL){
 544         curl_easy_cleanup (curl);
 545         curl = NULL;
 546     }
 547 }
 548
 549 static CURL *opkg_curl_init(opkg_conf_t *conf, curl_progress_func cb, void *data){
 550
 551     if(curl == NULL){
 552         curl = curl_easy_init();
 553
 554 #ifdef HAVE_SSLCURL
 555         openssl_init();
 556
 557         if (conf->ssl_engine) {
 558
 559             /* use crypto engine */
 560             if (curl_easy_setopt(curl, CURLOPT_SSLENGINE, conf->ssl_engine) != CURLE_OK){
 561                 opkg_message(conf, OPKG_ERROR, "can't set crypto engine: '%s'\n",
 562                         conf->ssl_engine);
 563
 564                 opkg_curl_cleanup();
 565                 return NULL;
 566             }
 567             /* set the crypto engine as default */
 568             if (curl_easy_setopt(curl, CURLOPT_SSLENGINE_DEFAULT, 1L) != CURLE_OK){
 569                 opkg_message(conf, OPKG_ERROR, "can't set crypto engine as default\n");
 570
 571                 opkg_curl_cleanup();
 572                 return NULL;
 573             }
 574         }
 575
 576         /* cert & key can only be in PEM case in the same file */
 577         if(conf->ssl_key_passwd){
 578             if (curl_easy_setopt(curl, CURLOPT_SSLKEYPASSWD, conf->ssl_key_passwd) != CURLE_OK)
 579             {
 580                 opkg_message(conf, OPKG_DEBUG, "Failed to set key password\n");
 581             }
 582         }
 583
 584         /* sets the client certificate and its type */
 585         if(conf->ssl_cert_type){
 586             if (curl_easy_setopt(curl, CURLOPT_SSLCERTTYPE, conf->ssl_cert_type) != CURLE_OK)
 587             {
 588                 opkg_message(conf, OPKG_DEBUG, "Failed to set certificate format\n");
 589             }
 590         }
 591         /* SSL cert name isn't mandatory */
 592         if(conf->ssl_cert){
 593                 curl_easy_setopt(curl, CURLOPT_SSLCERT, conf->ssl_cert);
 594         }
 595
 596         /* sets the client key and its type */
 597         if(conf->ssl_key_type){
 598             if (curl_easy_setopt(curl, CURLOPT_SSLKEYTYPE, conf->ssl_key_type) != CURLE_OK)
 599             {
 600                 opkg_message(conf, OPKG_DEBUG, "Failed to set key format\n");
 601             }
 602         }
 603         if(conf->ssl_key){
 604             if (curl_easy_setopt(curl, CURLOPT_SSLKEY, conf->ssl_key) != CURLE_OK)
 605             {
 606                 opkg_message(conf, OPKG_DEBUG, "Failed to set key\n");
 607             }
 608         }
 609
 610         /* Should we verify the peer certificate ? */
 611         if(conf->ssl_dont_verify_peer){
 612             /*
 613              * CURLOPT_SSL_VERIFYPEER default is nonzero (curl => 7.10)
 614              */
 615             curl_easy_setopt(curl, CURLOPT_SSL_VERIFYPEER, 0);
 616         }else{
 617 #ifdef HAVE_PATHFINDER
 618             if(conf->check_x509_path){
 619                 if (curl_easy_setopt(curl, CURLOPT_SSL_CTX_FUNCTION, curl_ssl_ctx_function) != CURLE_OK){
 620                     opkg_message(conf, OPKG_DEBUG, "Failed to set ssl path verification callback\n");
 621                 }else{
 622                     curl_easy_setopt(curl, CURLOPT_SSL_CTX_DATA, NULL);
 623                 }
 624             }
 625 #endif
 626         }
 627
 628         /* certification authority file and/or path */
 629         if(conf->ssl_ca_file){
 630             curl_easy_setopt(curl, CURLOPT_CAINFO, conf->ssl_ca_file);
 631         }
 632         if(conf->ssl_ca_path){
 633             curl_easy_setopt(curl, CURLOPT_CAPATH, conf->ssl_ca_path);
 634         }
 635 #endif
 636
 637         curl_easy_setopt (curl, CURLOPT_FOLLOWLOCATION, 1);
 638         curl_easy_setopt (curl, CURLOPT_FAILONERROR, 1);
 639         if (conf->http_proxy || conf->ftp_proxy)
 640         {
 641             char *userpwd;
 642             sprintf_alloc (&userpwd, "%s:%s", conf->proxy_user,
 643                     conf->proxy_passwd);
 644             curl_easy_setopt(curl, CURLOPT_PROXYUSERPWD, userpwd);
 645             free (userpwd);
 646         }
 647     }
 648
 649     curl_easy_setopt (curl, CURLOPT_NOPROGRESS, (cb == NULL));
 650     if (cb)
 651     {
 652         curl_easy_setopt (curl, CURLOPT_PROGRESSDATA, data);
 653         curl_easy_setopt (curl, CURLOPT_PROGRESSFUNCTION, cb);
 654     }
 655
 656     return curl;
 657
 658 }
 659 #endif