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 void opkg_curl_cleanup(void);
  72 static CURL *opkg_curl_init(opkg_conf_t *conf, curl_progress_func cb, void *data);
  73 #endif
  74
  75 int opkg_download(opkg_conf_t *conf, const char *src,
  76   const char *dest_file_name, curl_progress_func cb, void *data)
  77 {
  78     int err = 0;
  79
  80     char *src_basec = xstrdup(src);
  81     char *src_base = basename(src_basec);
  82     char *tmp_file_location;
  83
  84     opkg_message(conf,OPKG_NOTICE,"Downloading %s\n", src);
  85
  86     if (str_starts_with(src, "file:")) {
  87         int ret;
  88         const char *file_src = src + 5;
  89         opkg_message(conf,OPKG_INFO,"Copying %s to %s...", file_src, dest_file_name);
  90         ret = file_copy(src + 5, dest_file_name);
  91         opkg_message(conf,OPKG_INFO,"Done\n");
  92         free(src_basec);
  93         return ret;
  94     }
  95
  96     sprintf_alloc(&tmp_file_location, "%s/%s", conf->tmp_dir, src_base);
  97     err = unlink(tmp_file_location);
  98     if (err && errno != ENOENT) {
  99         opkg_message(conf,OPKG_ERROR, "%s: ERROR: failed to unlink %s: %s\n",
 100                 __FUNCTION__, tmp_file_location, strerror(errno));
 101         free(tmp_file_location);
 102         free(src_basec);
 103         return errno;
 104     }
 105
 106     if (conf->http_proxy) {
 107         opkg_message(conf,OPKG_DEBUG,"Setting environment variable: http_proxy = %s\n", conf->http_proxy);
 108         setenv("http_proxy", conf->http_proxy, 1);
 109     }
 110     if (conf->ftp_proxy) {
 111         opkg_message(conf,OPKG_DEBUG,"Setting environment variable: ftp_proxy = %s\n", conf->ftp_proxy);
 112         setenv("ftp_proxy", conf->ftp_proxy, 1);
 113     }
 114     if (conf->no_proxy) {
 115         opkg_message(conf,OPKG_DEBUG,"Setting environment variable: no_proxy = %s\n", conf->no_proxy);
 116         setenv("no_proxy", conf->no_proxy, 1);
 117     }
 118
 119 #ifdef HAVE_CURL
 120     CURLcode res;
 121     FILE * file = fopen (tmp_file_location, "w");
 122
 123     curl = opkg_curl_init (conf, cb, data);
 124     if (curl)
 125     {
 126         curl_easy_setopt (curl, CURLOPT_URL, src);
 127         curl_easy_setopt (curl, CURLOPT_WRITEDATA, file);
 128
 129         res = curl_easy_perform (curl);
 130         fclose (file);
 131         if (res)
 132         {
 133             long error_code;
 134             curl_easy_getinfo(curl, CURLINFO_RESPONSE_CODE, &error_code);
 135             opkg_message(conf, OPKG_ERROR, "Failed to download %s. \nerror detail: %s\n", src, curl_easy_strerror(res));
 136             free(tmp_file_location);
 137             free(src_basec);
 138             return res;
 139         }
 140
 141     }
 142     else
 143     {
 144         free(tmp_file_location);
 145         free(src_basec);
 146         return -1;
 147     }
 148 #else
 149     {
 150       int res;
 151       char *wgetcmd;
 152       char *wgetopts;
 153       wgetopts = getenv("OPKG_WGETOPTS");
 154       sprintf_alloc(&wgetcmd, "wget -q %s%s -O \"%s\" \"%s\"",
 155                     (conf->http_proxy || conf->ftp_proxy) ? "-Y on " : "",
 156                     (wgetopts!=NULL) ? wgetopts : "",
 157                     tmp_file_location, src);
 158       opkg_message(conf, OPKG_INFO, "Executing: %s\n", wgetcmd);
 159       res = xsystem(wgetcmd);
 160       free(wgetcmd);
 161       if (res) {
 162         opkg_message(conf, OPKG_ERROR, "Failed to download %s, error %d\n", src, res);
 163         free(tmp_file_location);
 164         free(src_basec);
 165         return res;
 166       }
 167     }
 168 #endif
 169
 170     err = file_move(tmp_file_location, dest_file_name);
 171
 172     free(tmp_file_location);
 173     free(src_basec);
 174
 175     if (err) {
 176         return err;
 177     }
 178
 179     return 0;
 180 }
 181
 182 static int opkg_download_cache(opkg_conf_t *conf, const char *src,
 183   const char *dest_file_name, curl_progress_func cb, void *data)
 184 {
 185     char *cache_name = xstrdup(src);
 186     char *cache_location, *p;
 187     int err = 0;
 188
 189     if (!conf->cache || str_starts_with(src, "file:")) {
 190         err = opkg_download(conf, src, dest_file_name, cb, data);
 191         goto out1;
 192     }
 193
 194     for (p = cache_name; *p; p++)
 195         if (*p == '/')
 196             *p = ',';   /* looks nicer than | or # */
 197
 198     sprintf_alloc(&cache_location, "%s/%s", conf->cache, cache_name);
 199     if (file_exists(cache_location))
 200         opkg_message(conf, OPKG_NOTICE, "Copying %s\n", cache_location);
 201     else {
 202         err = opkg_download(conf, src, cache_location, cb, data);
 203         if (err) {
 204             (void) unlink(cache_location);
 205             goto out2;
 206         }
 207     }
 208
 209     err = file_copy(cache_location, dest_file_name);
 210
 211
 212 out2:
 213     free(cache_location);
 214 out1:
 215     free(cache_name);
 216     return err;
 217 }
 218
 219 int opkg_download_pkg(opkg_conf_t *conf, pkg_t *pkg, const char *dir)
 220 {
 221     int err;
 222     char *url;
 223     char *stripped_filename;
 224
 225     if (pkg->src == NULL) {
 226         opkg_message(conf,OPKG_ERROR, "ERROR: Package %s (parent %s) is not available from any configured src.\n",
 227                 pkg->name, pkg->parent->name);
 228         return -1;
 229     }
 230     if (pkg->filename == NULL) {
 231         opkg_message(conf,OPKG_ERROR, "ERROR: Package %s (parent %s) does not have a valid filename field.\n",pkg->name, pkg->parent->name);
 232         return -1;
 233     }
 234
 235     sprintf_alloc(&url, "%s/%s", pkg->src->value, pkg->filename);
 236
 237     /* XXX: BUG: The pkg->filename might be something like
 238        "../../foo.opk". While this is correct, and exactly what we
 239        want to use to construct url above, here we actually need to
 240        use just the filename part, without any directory. */
 241
 242     stripped_filename = strrchr(pkg->filename, '/');
 243     if ( ! stripped_filename )
 244         stripped_filename = pkg->filename;
 245
 246     sprintf_alloc(&pkg->local_filename, "%s/%s", dir, stripped_filename);
 247
 248     err = opkg_download_cache(conf, url, pkg->local_filename, NULL, NULL);
 249     free(url);
 250
 251     return err;
 252 }
 253
 254 /*
 255  * Downloads file from url, installs in package database, return package name.
 256  */
 257 int opkg_prepare_url_for_install(opkg_conf_t *conf, const char *url, char **namep)
 258 {
 259      int err = 0;
 260      pkg_t *pkg;
 261
 262      pkg = pkg_new();
 263
 264      if (str_starts_with(url, "http://")
 265          || str_starts_with(url, "ftp://")) {
 266           char *tmp_file;
 267           char *file_basec = xstrdup(url);
 268           char *file_base = basename(file_basec);
 269
 270           sprintf_alloc(&tmp_file, "%s/%s", conf->tmp_dir, file_base);
 271           err = opkg_download(conf, url, tmp_file, NULL, NULL);
 272           if (err)
 273                return err;
 274
 275           err = pkg_init_from_file(pkg, tmp_file);
 276           if (err)
 277                return err;
 278
 279           free(tmp_file);
 280           free(file_basec);
 281
 282      } else if (strcmp(&url[strlen(url) - 4], OPKG_PKG_EXTENSION) == 0
 283                 || strcmp(&url[strlen(url) - 4], IPKG_PKG_EXTENSION) == 0
 284                 || strcmp(&url[strlen(url) - 4], DPKG_PKG_EXTENSION) == 0) {
 285
 286           err = pkg_init_from_file(pkg, url);
 287           if (err)
 288                return err;
 289           opkg_message(conf, OPKG_DEBUG2, "Package %s provided by hand (%s).\n", pkg->name,pkg->local_filename);
 290           pkg->provided_by_hand = 1;
 291
 292      } else {
 293        pkg_deinit(pkg);
 294        free(pkg);
 295        return 0;
 296      }
 297
 298      if (!pkg->architecture) {
 299           opkg_message(conf, OPKG_ERROR, "Package %s has no Architecture defined.\n", pkg->name);
 300           return -EINVAL;
 301      }
 302
 303      pkg->dest = conf->default_dest;
 304      pkg->state_want = SW_INSTALL;
 305      pkg->state_flag |= SF_PREFER;
 306      pkg = hash_insert_pkg(&conf->pkg_hash, pkg, 1,conf);
 307
 308      if (namep) {
 309           *namep = pkg->name;
 310      }
 311      return 0;
 312 }
 313
 314 int
 315 opkg_verify_file (opkg_conf_t *conf, char *text_file, char *sig_file)
 316 {
 317 #if defined HAVE_GPGME
 318     if (conf->check_signature == 0 )
 319         return 0;
 320     int status = -1;
 321     gpgme_ctx_t ctx;
 322     gpgme_data_t sig, text, key;
 323     gpgme_error_t err = -1;
 324     gpgme_verify_result_t result;
 325     gpgme_signature_t s;
 326     char *trusted_path = NULL;
 327
 328     err = gpgme_new (&ctx);
 329
 330     if (err)
 331         return -1;
 332
 333     sprintf_alloc(&trusted_path, "%s/%s", conf->offline_root, "/etc/opkg/trusted.gpg");
 334     err = gpgme_data_new_from_file (&key, trusted_path, 1);
 335     free (trusted_path);
 336     if (err)
 337     {
 338       return -1;
 339     }
 340     err = gpgme_op_import (ctx, key);
 341     if (err)
 342     {
 343       gpgme_data_release (key);
 344       return -1;
 345     }
 346     gpgme_data_release (key);
 347
 348     err = gpgme_data_new_from_file (&sig, sig_file, 1);
 349     if (err)
 350     {
 351         gpgme_release (ctx);
 352         return -1;
 353     }
 354
 355     err = gpgme_data_new_from_file (&text, text_file, 1);
 356     if (err)
 357     {
 358         gpgme_data_release (sig);
 359         gpgme_release (ctx);
 360         return -1;
 361     }
 362
 363     err = gpgme_op_verify (ctx, sig, text, NULL);
 364
 365     result = gpgme_op_verify_result (ctx);
 366     if (!result)
 367         return -1;
 368
 369     /* see if any of the signitures matched */
 370     s = result->signatures;
 371     while (s)
 372     {
 373         status = gpg_err_code (s->status);
 374         if (status == GPG_ERR_NO_ERROR)
 375             break;
 376         s = s->next;
 377     }
 378
 379
 380     gpgme_data_release (sig);
 381     gpgme_data_release (text);
 382     gpgme_release (ctx);
 383
 384     return status;
 385 #elif defined HAVE_OPENSSL
 386     X509_STORE *store = NULL;
 387     PKCS7 *p7 = NULL;
 388     BIO *in = NULL, *indata = NULL;
 389
 390     // Sig check failed by default !
 391     int status = -1;
 392
 393     openssl_init();
 394
 395     // Set-up the key store
 396     if(!(store = setup_verify(conf, conf->signature_ca_file, conf->signature_ca_path))){
 397         opkg_message(conf, OPKG_ERROR,
 398                 "Can't open CA certificates\n");
 399         goto verify_file_end;
 400     }
 401
 402     // Open a BIO to read the sig file
 403     if (!(in = BIO_new_file(sig_file, "rb"))){
 404         opkg_message(conf, OPKG_ERROR,
 405                 "Can't open signature file %s\n", sig_file);
 406         goto verify_file_end;
 407     }
 408
 409     // Read the PKCS7 block contained in the sig file
 410     p7 = PEM_read_bio_PKCS7(in, NULL, NULL, NULL);
 411     if(!p7){
 412         opkg_message(conf, OPKG_ERROR,
 413                 "Can't read signature file (Corrupted ?)\n");
 414         goto verify_file_end;
 415     }
 416 #if defined(HAVE_PATHFINDER)
 417     if(conf->check_x509_path){
 418         if(!pkcs7_pathfinder_verify_signers(p7)){
 419             opkg_message(conf,  OPKG_ERROR, "pkcs7_pathfinder_verify_signers: "
 420                     "Path verification failed\n");
 421             goto verify_file_end;
 422         }
 423     }
 424 #endif
 425
 426     // Open the Package file to authenticate
 427     if (!(indata = BIO_new_file(text_file, "rb"))){
 428         opkg_message(conf, OPKG_ERROR,
 429                 "Can't open file %s\n", text_file);
 430         goto verify_file_end;
 431     }
 432
 433     // Let's verify the autenticity !
 434     if (PKCS7_verify(p7, NULL, store, indata, NULL, PKCS7_BINARY) != 1){
 435         // Get Off My Lawn!
 436         opkg_message(conf, OPKG_ERROR,
 437                 "Verification failure\n");
 438     }else{
 439         // Victory !
 440         status = 0;
 441     }
 442
 443 verify_file_end:
 444     BIO_free(in);
 445     BIO_free(indata);
 446     PKCS7_free(p7);
 447     X509_STORE_free(store);
 448
 449     return status;
 450 #else
 451     /* mute `unused variable' warnings. */
 452     (void) sig_file;
 453     (void) text_file;
 454     (void) conf;
 455     return 0;
 456 #endif
 457 }
 458
 459
 460 #if defined(HAVE_OPENSSL) || defined(HAVE_SSLCURL)
 461 static void openssl_init(void){
 462     static int init = 0;
 463
 464     if(!init){
 465         OPENSSL_config(NULL);
 466         OpenSSL_add_all_algorithms();
 467         ERR_load_crypto_strings();
 468         init = 1;
 469     }
 470 }
 471
 472 #endif
 473
 474
 475 #if defined HAVE_OPENSSL
 476 static X509_STORE *setup_verify(opkg_conf_t *conf, char *CAfile, char *CApath){
 477     X509_STORE *store = NULL;
 478     X509_LOOKUP *lookup = NULL;
 479
 480     if(!(store = X509_STORE_new())){
 481         // Something bad is happening...
 482         goto end;
 483     }
 484
 485     // adds the X509 file lookup method
 486     lookup = X509_STORE_add_lookup(store,X509_LOOKUP_file());
 487     if (lookup == NULL){
 488         goto end;
 489     }
 490
 491     // Autenticating against one CA file
 492     if (CAfile) {
 493         if(!X509_LOOKUP_load_file(lookup,CAfile,X509_FILETYPE_PEM)) {
 494             // Invalid CA => Bye bye
 495             opkg_message(conf, OPKG_ERROR,
 496                     "Error loading file %s\n", CAfile);
 497             goto end;
 498         }
 499     } else {
 500         X509_LOOKUP_load_file(lookup,NULL,X509_FILETYPE_DEFAULT);
 501     }
 502
 503     // Now look into CApath directory if supplied
 504     lookup = X509_STORE_add_lookup(store,X509_LOOKUP_hash_dir());
 505     if (lookup == NULL){
 506         goto end;
 507     }
 508
 509     if (CApath) {
 510         if(!X509_LOOKUP_add_dir(lookup,CApath,X509_FILETYPE_PEM)) {
 511             opkg_message(conf, OPKG_ERROR,
 512                     "Error loading directory %s\n", CApath);
 513             goto end;
 514         }
 515     } else {
 516         X509_LOOKUP_add_dir(lookup,NULL,X509_FILETYPE_DEFAULT);
 517     }
 518
 519     // All right !
 520     ERR_clear_error();
 521     return store;
 522
 523 end:
 524
 525     X509_STORE_free(store);
 526     return NULL;
 527
 528 }
 529
 530 #endif
 531
 532 #ifdef HAVE_CURL
 533 static void opkg_curl_cleanup(void){
 534     if(curl != NULL){
 535         curl_easy_cleanup (curl);
 536         curl = NULL;
 537     }
 538 }
 539
 540 static CURL *opkg_curl_init(opkg_conf_t *conf, curl_progress_func cb, void *data){
 541
 542     if(curl == NULL){
 543         curl = curl_easy_init();
 544
 545 #ifdef HAVE_SSLCURL
 546         openssl_init();
 547
 548         if (conf->ssl_engine) {
 549
 550             /* use crypto engine */
 551             if (curl_easy_setopt(curl, CURLOPT_SSLENGINE, conf->ssl_engine) != CURLE_OK){
 552                 opkg_message(conf, OPKG_ERROR, "can't set crypto engine: '%s'\n",
 553                         conf->ssl_engine);
 554
 555                 opkg_curl_cleanup();
 556                 return NULL;
 557             }
 558             /* set the crypto engine as default */
 559             if (curl_easy_setopt(curl, CURLOPT_SSLENGINE_DEFAULT, 1L) != CURLE_OK){
 560                 opkg_message(conf, OPKG_ERROR, "can't set crypto engine as default\n");
 561
 562                 opkg_curl_cleanup();
 563                 return NULL;
 564             }
 565         }
 566
 567         /* cert & key can only be in PEM case in the same file */
 568         if(conf->ssl_key_passwd){
 569             if (curl_easy_setopt(curl, CURLOPT_SSLKEYPASSWD, conf->ssl_key_passwd) != CURLE_OK)
 570             {
 571                 opkg_message(conf, OPKG_DEBUG, "Failed to set key password\n");
 572             }
 573         }
 574
 575         /* sets the client certificate and its type */
 576         if(conf->ssl_cert_type){
 577             if (curl_easy_setopt(curl, CURLOPT_SSLCERTTYPE, conf->ssl_cert_type) != CURLE_OK)
 578             {
 579                 opkg_message(conf, OPKG_DEBUG, "Failed to set certificate format\n");
 580             }
 581         }
 582         /* SSL cert name isn't mandatory */
 583         if(conf->ssl_cert){
 584                 curl_easy_setopt(curl, CURLOPT_SSLCERT, conf->ssl_cert);
 585         }
 586
 587         /* sets the client key and its type */
 588         if(conf->ssl_key_type){
 589             if (curl_easy_setopt(curl, CURLOPT_SSLKEYTYPE, conf->ssl_key_type) != CURLE_OK)
 590             {
 591                 opkg_message(conf, OPKG_DEBUG, "Failed to set key format\n");
 592             }
 593         }
 594         if(conf->ssl_key){
 595             if (curl_easy_setopt(curl, CURLOPT_SSLKEY, conf->ssl_key) != CURLE_OK)
 596             {
 597                 opkg_message(conf, OPKG_DEBUG, "Failed to set key\n");
 598             }
 599         }
 600
 601         /* Should we verify the peer certificate ? */
 602         if(conf->ssl_dont_verify_peer){
 603             /*
 604              * CURLOPT_SSL_VERIFYPEER default is nonzero (curl => 7.10)
 605              */
 606             curl_easy_setopt(curl, CURLOPT_SSL_VERIFYPEER, 0);
 607         }else{
 608 #ifdef HAVE_PATHFINDER
 609             if(conf->check_x509_path){
 610                 if (curl_easy_setopt(curl, CURLOPT_SSL_CTX_FUNCTION, curl_ssl_ctx_function) != CURLE_OK){
 611                     opkg_message(conf, OPKG_DEBUG, "Failed to set ssl path verification callback\n");
 612                 }else{
 613                     curl_easy_setopt(curl, CURLOPT_SSL_CTX_DATA, NULL);
 614                 }
 615             }
 616 #endif
 617         }
 618
 619         /* certification authority file and/or path */
 620         if(conf->ssl_ca_file){
 621             curl_easy_setopt(curl, CURLOPT_CAINFO, conf->ssl_ca_file);
 622         }
 623         if(conf->ssl_ca_path){
 624             curl_easy_setopt(curl, CURLOPT_CAPATH, conf->ssl_ca_path);
 625         }
 626 #endif
 627
 628         curl_easy_setopt (curl, CURLOPT_FOLLOWLOCATION, 1);
 629         curl_easy_setopt (curl, CURLOPT_FAILONERROR, 1);
 630         if (conf->http_proxy || conf->ftp_proxy)
 631         {
 632             char *userpwd;
 633             sprintf_alloc (&userpwd, "%s:%s", conf->proxy_user,
 634                     conf->proxy_passwd);
 635             curl_easy_setopt(curl, CURLOPT_PROXYUSERPWD, userpwd);
 636             free (userpwd);
 637         }
 638
 639         /* add curl cleanup callback */
 640         if(!atexit(opkg_curl_cleanup)){
 641             opkg_message(conf,OPKG_DEBUG, "Failed to register atexit curl cleanup function\n");
 642         }
 643
 644     }
 645
 646     curl_easy_setopt (curl, CURLOPT_NOPROGRESS, (cb == NULL));
 647     if (cb)
 648     {
 649         curl_easy_setopt (curl, CURLOPT_PROGRESSDATA, data);
 650         curl_easy_setopt (curl, CURLOPT_PROGRESSFUNCTION, cb);
 651     }
 652
 653     return curl;
 654
 655 }
 656 #endif