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