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