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 #endif
  30
  31 #if defined(HAVE_GPGME)
  32 #include <gpgme.h>
  33 #elif defined(HAVE_OPENSSL)
  34 #include <openssl/bio.h>
  35 #include <openssl/objects.h>
  36 #include <openssl/x509.h>
  37 #include <openssl/pem.h>
  38 #include <openssl/hmac.h>
  39 #endif
  40
  41 #include "includes.h"
  42 #include "opkg_download.h"
  43 #include "opkg_message.h"
  44
  45 #include "sprintf_alloc.h"
  46 #include "xsystem.h"
  47 #include "file_util.h"
  48 #include "str_util.h"
  49 #include "opkg_defines.h"
  50
  51 #if defined(HAVE_OPENSSL) || defined(HAVE_SSLCURL)
  52 static void openssl_init(void);
  53 #endif
  54
  55 #ifdef HAVE_OPENSSL
  56 static X509_STORE *setup_verify(opkg_conf_t *conf, char *CAfile, char *CApath);
  57 #endif
  58
  59 #ifdef HAVE_CURL
  60 /*
  61  * Make curl an instance variable so we don't have to instanciate it
  62  * each time
  63  */
  64 static CURL *curl = NULL;
  65 static void opkg_curl_cleanup(void);
  66 static CURL *opkg_curl_init(opkg_conf_t *conf, curl_progress_func cb, void *data);
  67 #endif
  68
  69 int opkg_download(opkg_conf_t *conf, const char *src,
  70   const char *dest_file_name, curl_progress_func cb, void *data)
  71 {
  72     int err = 0;
  73
  74     char *src_basec = strdup(src);
  75     char *src_base = basename(src_basec);
  76     char *tmp_file_location;
  77
  78     opkg_message(conf,OPKG_NOTICE,"Downloading %s\n", src);
  79
  80     if (str_starts_with(src, "file:")) {
  81         int ret;
  82         const char *file_src = src + 5;
  83         opkg_message(conf,OPKG_INFO,"Copying %s to %s...", file_src, dest_file_name);
  84         ret = file_copy(src + 5, dest_file_name);
  85         opkg_message(conf,OPKG_INFO,"Done\n");
  86         free(src_basec);
  87         return ret;
  88     }
  89
  90     sprintf_alloc(&tmp_file_location, "%s/%s", conf->tmp_dir, src_base);
  91     err = unlink(tmp_file_location);
  92     if (err && errno != ENOENT) {
  93         opkg_message(conf,OPKG_ERROR, "%s: ERROR: failed to unlink %s: %s\n",
  94                 __FUNCTION__, tmp_file_location, strerror(errno));
  95         free(tmp_file_location);
  96         free(src_basec);
  97         return errno;
  98     }
  99
 100     if (conf->http_proxy) {
 101         opkg_message(conf,OPKG_DEBUG,"Setting environment variable: http_proxy = %s\n", conf->http_proxy);
 102         setenv("http_proxy", conf->http_proxy, 1);
 103     }
 104     if (conf->ftp_proxy) {
 105         opkg_message(conf,OPKG_DEBUG,"Setting environment variable: ftp_proxy = %s\n", conf->ftp_proxy);
 106         setenv("ftp_proxy", conf->ftp_proxy, 1);
 107     }
 108     if (conf->no_proxy) {
 109         opkg_message(conf,OPKG_DEBUG,"Setting environment variable: no_proxy = %s\n", conf->no_proxy);
 110         setenv("no_proxy", conf->no_proxy, 1);
 111     }
 112
 113 #ifdef HAVE_CURL
 114     CURL *curl;
 115     CURLcode res;
 116     FILE * file = fopen (tmp_file_location, "w");
 117
 118     curl = opkg_curl_init (conf, cb, data);
 119     if (curl)
 120     {
 121         curl_easy_setopt (curl, CURLOPT_URL, src);
 122         curl_easy_setopt (curl, CURLOPT_WRITEDATA, file);
 123
 124         res = curl_easy_perform (curl);
 125         fclose (file);
 126         if (res)
 127         {
 128             long error_code;
 129             curl_easy_getinfo(curl, CURLINFO_RESPONSE_CODE, &error_code);
 130             opkg_message(conf, OPKG_ERROR, "Failed to download %s. \nerror detail: %s\n", src, curl_easy_strerror(res));
 131             free(tmp_file_location);
 132             free(src_basec);
 133             return res;
 134         }
 135
 136     }
 137     else
 138     {
 139         free(tmp_file_location);
 140         free(src_basec);
 141         return -1;
 142     }
 143 #else
 144     {
 145       int res;
 146       char *wgetcmd;
 147       char *wgetopts;
 148       wgetopts = getenv("OPKG_WGETOPTS");
 149       sprintf_alloc(&wgetcmd, "wget -q %s%s -O \"%s\" \"%s\"",
 150                     (conf->http_proxy || conf->ftp_proxy) ? "-Y on " : "",
 151                     (wgetopts!=NULL) ? wgetopts : "",
 152                     tmp_file_location, src);
 153       opkg_message(conf, OPKG_INFO, "Executing: %s\n", wgetcmd);
 154       res = xsystem(wgetcmd);
 155       free(wgetcmd);
 156       if (res) {
 157         opkg_message(conf, OPKG_ERROR, "Failed to download %s, error %d\n", src, res);
 158         free(tmp_file_location);
 159         free(src_basec);
 160         return res;
 161       }
 162     }
 163 #endif
 164
 165     err = file_move(tmp_file_location, dest_file_name);
 166
 167     free(tmp_file_location);
 168     free(src_basec);
 169
 170     if (err) {
 171         return err;
 172     }
 173
 174     return 0;
 175 }
 176
 177 static int opkg_download_cache(opkg_conf_t *conf, const char *src,
 178   const char *dest_file_name, curl_progress_func cb, void *data)
 179 {
 180     char *cache_name = strdup(src);
 181     char *cache_location, *p;
 182     int err = 0;
 183
 184     if (!conf->cache || str_starts_with(src, "file:")) {
 185         err = opkg_download(conf, src, dest_file_name, cb, data);
 186         goto out1;
 187     }
 188
 189     for (p = cache_name; *p; p++)
 190         if (*p == '/')
 191             *p = ',';   /* looks nicer than | or # */
 192
 193     sprintf_alloc(&cache_location, "%s/%s", conf->cache, cache_name);
 194     if (file_exists(cache_location))
 195         opkg_message(conf, OPKG_NOTICE, "Copying %s\n", cache_location);
 196     else {
 197         err = opkg_download(conf, src, cache_location, cb, data);
 198         if (err) {
 199             (void) unlink(cache_location);
 200             goto out2;
 201         }
 202     }
 203
 204     err = file_copy(cache_location, dest_file_name);
 205
 206
 207 out2:
 208     free(cache_location);
 209 out1:
 210     free(cache_name);
 211     return err;
 212 }
 213
 214 int opkg_download_pkg(opkg_conf_t *conf, pkg_t *pkg, const char *dir)
 215 {
 216     int err;
 217     char *url;
 218     char *stripped_filename;
 219
 220     if (pkg->src == NULL) {
 221         opkg_message(conf,OPKG_ERROR, "ERROR: Package %s (parent %s) is not available from any configured src.\n",
 222                 pkg->name, pkg->parent->name);
 223         return -1;
 224     }
 225     if (pkg->filename == NULL) {
 226         opkg_message(conf,OPKG_ERROR, "ERROR: Package %s (parent %s) does not have a valid filename field.\n",pkg->name, pkg->parent->name);
 227         return -1;
 228     }
 229
 230     sprintf_alloc(&url, "%s/%s", pkg->src->value, pkg->filename);
 231
 232     /* XXX: BUG: The pkg->filename might be something like
 233        "../../foo.opk". While this is correct, and exactly what we
 234        want to use to construct url above, here we actually need to
 235        use just the filename part, without any directory. */
 236
 237     stripped_filename = strrchr(pkg->filename, '/');
 238     if ( ! stripped_filename )
 239         stripped_filename = pkg->filename;
 240
 241     sprintf_alloc(&pkg->local_filename, "%s/%s", dir, stripped_filename);
 242
 243     err = opkg_download_cache(conf, url, pkg->local_filename, NULL, NULL);
 244     free(url);
 245
 246     return err;
 247 }
 248
 249 /*
 250  * Downloads file from url, installs in package database, return package name.
 251  */
 252 int opkg_prepare_url_for_install(opkg_conf_t *conf, const char *url, char **namep)
 253 {
 254      int err = 0;
 255      pkg_t *pkg;
 256      pkg = pkg_new();
 257      if (pkg == NULL)
 258           return ENOMEM;
 259
 260      if (str_starts_with(url, "http://")
 261          || str_starts_with(url, "ftp://")) {
 262           char *tmp_file;
 263           char *file_basec = strdup(url);
 264           char *file_base = basename(file_basec);
 265
 266           sprintf_alloc(&tmp_file, "%s/%s", conf->tmp_dir, file_base);
 267           err = opkg_download(conf, url, tmp_file, NULL, NULL);
 268           if (err)
 269                return err;
 270
 271           err = pkg_init_from_file(pkg, tmp_file);
 272           if (err)
 273                return err;
 274
 275           free(tmp_file);
 276           free(file_basec);
 277
 278      } else if (strcmp(&url[strlen(url) - 4], OPKG_PKG_EXTENSION) == 0
 279                 || strcmp(&url[strlen(url) - 4], IPKG_PKG_EXTENSION) == 0
 280                 || strcmp(&url[strlen(url) - 4], DPKG_PKG_EXTENSION) == 0) {
 281
 282           err = pkg_init_from_file(pkg, url);
 283           if (err)
 284                return err;
 285           opkg_message(conf, OPKG_DEBUG2, "Package %s provided by hand (%s).\n", pkg->name,pkg->local_filename);
 286           pkg->provided_by_hand = 1;
 287
 288      } else {
 289        pkg_deinit(pkg);
 290        free(pkg);
 291        return 0;
 292      }
 293
 294      if (!pkg->architecture) {
 295           opkg_message(conf, OPKG_ERROR, "Package %s has no Architecture defined.\n", pkg->name);
 296           return -EINVAL;
 297      }
 298
 299      pkg->dest = conf->default_dest;
 300      pkg->state_want = SW_INSTALL;
 301      pkg->state_flag |= SF_PREFER;
 302      pkg = hash_insert_pkg(&conf->pkg_hash, pkg, 1,conf);
 303      if ( pkg == NULL ){
 304         fprintf(stderr, "%s : This should never happen. Report this Bug in bugzilla please \n ",__FUNCTION__);
 305         return 0;
 306      }
 307      if (namep) {
 308           *namep = strdup(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
 416     // Open the Package file to authenticate
 417     if (!(indata = BIO_new_file(text_file, "rb"))){
 418         opkg_message(conf, OPKG_ERROR,
 419                 "Can't open file %s\n", text_file);
 420         goto verify_file_end;
 421     }
 422
 423     // Let's verify the autenticity !
 424     if (PKCS7_verify(p7, NULL, store, indata, NULL, PKCS7_BINARY) != 1){
 425         // Get Off My Lawn!
 426         opkg_message(conf, OPKG_ERROR,
 427                 "Verification failure\n");
 428     }else{
 429         // Victory !
 430         status = 0;
 431     }
 432
 433 verify_file_end:
 434     BIO_free(in);
 435     BIO_free(indata);
 436     PKCS7_free(p7);
 437     X509_STORE_free(store);
 438
 439     return status;
 440 #else
 441     /* mute `unused variable' warnings. */
 442     (void) sig_file;
 443     (void) text_file;
 444     (void) conf;
 445     return 0;
 446 #endif
 447 }
 448
 449
 450 #if defined(HAVE_OPENSSL) || defined(HAVE_SSLCURL)
 451 static void openssl_init(void){
 452     static int init = 0;
 453
 454     if(!init){
 455         OPENSSL_config(NULL);
 456         OpenSSL_add_all_algorithms();
 457         ERR_load_crypto_strings();
 458         init = 1;
 459     }
 460 }
 461
 462 #endif
 463
 464
 465 #if defined HAVE_OPENSSL
 466 static X509_STORE *setup_verify(opkg_conf_t *conf, char *CAfile, char *CApath){
 467     X509_STORE *store = NULL;
 468     X509_LOOKUP *lookup = NULL;
 469
 470     if(!(store = X509_STORE_new())){
 471         // Something bad is happening...
 472         goto end;
 473     }
 474
 475     // adds the X509 file lookup method
 476     lookup = X509_STORE_add_lookup(store,X509_LOOKUP_file());
 477     if (lookup == NULL){
 478         goto end;
 479     }
 480
 481     // Autenticating against one CA file
 482     if (CAfile) {
 483         if(!X509_LOOKUP_load_file(lookup,CAfile,X509_FILETYPE_PEM)) {
 484             // Invalid CA => Bye bye
 485             opkg_message(conf, OPKG_ERROR,
 486                     "Error loading file %s\n", CAfile);
 487             goto end;
 488         }
 489     } else {
 490         X509_LOOKUP_load_file(lookup,NULL,X509_FILETYPE_DEFAULT);
 491     }
 492
 493     // Now look into CApath directory if supplied
 494     lookup = X509_STORE_add_lookup(store,X509_LOOKUP_hash_dir());
 495     if (lookup == NULL){
 496         goto end;
 497     }
 498
 499     if (CApath) {
 500         if(!X509_LOOKUP_add_dir(lookup,CApath,X509_FILETYPE_PEM)) {
 501             opkg_message(conf, OPKG_ERROR,
 502                     "Error loading directory %s\n", CApath);
 503             goto end;
 504         }
 505     } else {
 506         X509_LOOKUP_add_dir(lookup,NULL,X509_FILETYPE_DEFAULT);
 507     }
 508
 509     // All right !
 510     ERR_clear_error();
 511     return store;
 512
 513 end:
 514
 515     X509_STORE_free(store);
 516     return NULL;
 517
 518 }
 519
 520 #endif
 521
 522 #ifdef HAVE_CURL
 523 static void opkg_curl_cleanup(void){
 524     if(curl != NULL){
 525         curl_easy_cleanup (curl);
 526         curl = NULL;
 527     }
 528 }
 529
 530 static CURL *opkg_curl_init(opkg_conf_t *conf, curl_progress_func cb, void *data){
 531
 532     if(curl == NULL){
 533         curl = curl_easy_init();
 534
 535 #ifdef HAVE_SSLCURL
 536         openssl_init();
 537
 538         if (conf->ssl_engine) {
 539
 540             /* use crypto engine */
 541             if (curl_easy_setopt(curl, CURLOPT_SSLENGINE, conf->ssl_engine) != CURLE_OK){
 542                 opkg_message(conf, OPKG_ERROR, "can't set crypto engine: '%s'\n",
 543                         conf->ssl_engine);
 544
 545                 opkg_curl_cleanup();
 546                 return NULL;
 547             }
 548             /* set the crypto engine as default */
 549             if (curl_easy_setopt(curl, CURLOPT_SSLENGINE_DEFAULT, 1L) != CURLE_OK){
 550                 opkg_message(conf, OPKG_ERROR, "can't set crypto engine as default\n");
 551
 552                 opkg_curl_cleanup();
 553                 return NULL;
 554             }
 555         }
 556
 557         /* cert & key can only be in PEM case in the same file */
 558         if(conf->ssl_key_passwd){
 559             if (curl_easy_setopt(curl, CURLOPT_SSLKEYPASSWD, conf->ssl_key_passwd) != CURLE_OK)
 560             {
 561                 opkg_message(conf, OPKG_DEBUG, "Failed to set key password\n");
 562             }
 563         }
 564
 565         /* sets the client certificate and its type */
 566         if(conf->ssl_cert_type){
 567             if (curl_easy_setopt(curl, CURLOPT_SSLCERTTYPE, conf->ssl_cert_type) != CURLE_OK)
 568             {
 569                 opkg_message(conf, OPKG_DEBUG, "Failed to set certificate format\n");
 570             }
 571         }
 572         /* SSL cert name isn't mandatory */
 573         if(conf->ssl_cert){
 574                 curl_easy_setopt(curl, CURLOPT_SSLCERT, conf->ssl_cert);
 575         }
 576
 577         /* sets the client key and its type */
 578         if(conf->ssl_key_type){
 579             if (curl_easy_setopt(curl, CURLOPT_SSLKEYTYPE, conf->ssl_key_type) != CURLE_OK)
 580             {
 581                 opkg_message(conf, OPKG_DEBUG, "Failed to set key format\n");
 582             }
 583         }
 584         if(conf->ssl_key){
 585             if (curl_easy_setopt(curl, CURLOPT_SSLKEY, conf->ssl_key) != CURLE_OK)
 586             {
 587                 opkg_message(conf, OPKG_DEBUG, "Failed to set key\n");
 588             }
 589         }
 590
 591         /* Should we verify the peer certificate ? */
 592         if(conf->ssl_dont_verify_peer){
 593             /*
 594              * CURLOPT_SSL_VERIFYPEER default is nonzero (curl => 7.10)
 595              */
 596             curl_easy_setopt(curl, CURLOPT_SSL_VERIFYPEER, 0);
 597         }
 598
 599         /* certification authority file and/or path */
 600         if(conf->ssl_ca_file){
 601             curl_easy_setopt(curl, CURLOPT_CAINFO, conf->ssl_ca_file);
 602         }
 603         if(conf->ssl_ca_path){
 604             curl_easy_setopt(curl, CURLOPT_CAPATH, conf->ssl_ca_path);
 605         }
 606 #endif
 607
 608         curl_easy_setopt (curl, CURLOPT_FOLLOWLOCATION, 1);
 609         curl_easy_setopt (curl, CURLOPT_FAILONERROR, 1);
 610         if (conf->http_proxy || conf->ftp_proxy)
 611         {
 612             char *userpwd;
 613             sprintf_alloc (&userpwd, "%s:%s", conf->proxy_user,
 614                     conf->proxy_passwd);
 615             curl_easy_setopt(curl, CURLOPT_PROXYUSERPWD, userpwd);
 616             free (userpwd);
 617         }
 618
 619         /* add curl cleanup callback */
 620         if(!atexit(opkg_curl_cleanup)){
 621             opkg_message(conf,OPKG_DEBUG, "Failed to register atexit curl cleanup function\n");
 622         }
 623
 624     }
 625
 626     curl_easy_setopt (curl, CURLOPT_NOPROGRESS, (cb == NULL));
 627     if (cb)
 628     {
 629         curl_easy_setopt (curl, CURLOPT_PROGRESSDATA, data);
 630         curl_easy_setopt (curl, CURLOPT_PROGRESSFUNCTION, cb);
 631     }
 632
 633     return curl;
 634
 635 }
 636 #endif