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
  20 #include "config.h"
  21
  22 #include <stdio.h>
  23 #include <unistd.h>
  24 #include <libgen.h>
  25
  26 #include "opkg_download.h"
  27 #include "opkg_message.h"
  28
  29 #include "sprintf_alloc.h"
  30 #include "xsystem.h"
  31 #include "file_util.h"
  32 #include "opkg_defines.h"
  33 #include "libbb/libbb.h"
  34
  35 #ifdef HAVE_CURL
  36 #include <curl/curl.h>
  37 #endif
  38
  39 #if defined(HAVE_SSLCURL) || defined(HAVE_OPENSSL)
  40 #include <openssl/conf.h>
  41 #include <openssl/evp.h>
  42 #include <openssl/err.h>
  43 #include <openssl/ssl.h>
  44 #endif
  45
  46 #if defined(HAVE_GPGME)
  47 #include <gpgme.h>
  48 #elif defined(HAVE_OPENSSL)
  49 #include <openssl/bio.h>
  50 #include <openssl/objects.h>
  51 #include <openssl/x509.h>
  52 #include <openssl/pem.h>
  53 #include <openssl/hmac.h>
  54 #endif
  55
  56 #ifdef HAVE_PATHFINDER
  57 #include "opkg_pathfinder.h"
  58 #endif
  59
  60 #if defined(HAVE_OPENSSL) || defined(HAVE_SSLCURL)
  61 static void openssl_init(void);
  62 #endif
  63
  64 #ifdef HAVE_OPENSSL
  65 static X509_STORE *setup_verify(char *CAfile, char *CApath);
  66 #endif
  67
  68 #ifdef HAVE_CURL
  69 /*
  70  * Make curl an instance variable so we don't have to instanciate it
  71  * each time
  72  */
  73 static CURL *curl = NULL;
  74 static CURL *opkg_curl_init(curl_progress_func cb, void *data);
  75 #endif
  76
  77 static int
  78 str_starts_with(const char *str, const char *prefix)
  79 {
  80     return (strncmp(str, prefix, strlen(prefix)) == 0);
  81 }
  82
  83 int
  84 opkg_download(const char *src, const char *dest_file_name,
  85         curl_progress_func cb, void *data, const short hide_error)
  86 {
  87     int err = 0;
  88
  89     char *src_basec = xstrdup(src);
  90     char *src_base = basename(src_basec);
  91     char *tmp_file_location;
  92
  93     opkg_msg(NOTICE,"Downloading %s.\n", src);
  94
  95     if (str_starts_with(src, "file:")) {
  96         const char *file_src = src + 5;
  97         opkg_msg(INFO, "Copying %s to %s...", file_src, dest_file_name);
  98         err = file_copy(file_src, dest_file_name);
  99         opkg_msg(INFO, "Done.\n");
 100         free(src_basec);
 101         return err;
 102     }
 103
 104     sprintf_alloc(&tmp_file_location, "%s/%s", conf->tmp_dir, src_base);
 105     free(src_basec);
 106     err = unlink(tmp_file_location);
 107     if (err && errno != ENOENT) {
 108         opkg_perror(ERROR, "Failed to unlink %s", tmp_file_location);
 109         free(tmp_file_location);
 110         return -1;
 111     }
 112
 113     if (conf->http_proxy) {
 114         opkg_msg(DEBUG, "Setting environment variable: http_proxy = %s.\n",
 115                 conf->http_proxy);
 116         setenv("http_proxy", conf->http_proxy, 1);
 117     }
 118     if (conf->ftp_proxy) {
 119         opkg_msg(DEBUG, "Setting environment variable: ftp_proxy = %s.\n",
 120                 conf->ftp_proxy);
 121         setenv("ftp_proxy", conf->ftp_proxy, 1);
 122     }
 123     if (conf->no_proxy) {
 124         opkg_msg(DEBUG,"Setting environment variable: no_proxy = %s.\n",
 125                 conf->no_proxy);
 126         setenv("no_proxy", conf->no_proxy, 1);
 127     }
 128
 129 #ifdef HAVE_CURL
 130     CURLcode res;
 131     FILE * file = fopen (tmp_file_location, "w");
 132
 133     curl = opkg_curl_init (cb, data);
 134     if (curl)
 135     {
 136         curl_easy_setopt (curl, CURLOPT_URL, src);
 137         curl_easy_setopt (curl, CURLOPT_WRITEDATA, file);
 138
 139         res = curl_easy_perform (curl);
 140         fclose (file);
 141         if (res)
 142         {
 143             long error_code;
 144             curl_easy_getinfo(curl, CURLINFO_RESPONSE_CODE, &error_code);
 145             opkg_msg(hide_error?DEBUG2:ERROR, "Failed to download %s: %s.\n",
 146                     src, curl_easy_strerror(res));
 147             free(tmp_file_location);
 148             return -1;
 149         }
 150
 151     }
 152     else
 153     {
 154         free(tmp_file_location);
 155         return -1;
 156     }
 157 #else
 158     {
 159       int res;
 160       const char *argv[8];
 161       int i = 0;
 162
 163       argv[i++] = "wget";
 164       argv[i++] = "-q";
 165       if (conf->http_proxy || conf->ftp_proxy) {
 166         argv[i++] = "-Y";
 167         argv[i++] = "on";
 168       }
 169       argv[i++] = "-O";
 170       argv[i++] = tmp_file_location;
 171       argv[i++] = src;
 172       argv[i++] = NULL;
 173       res = xsystem(argv);
 174
 175       if (res) {
 176         opkg_msg(ERROR, "Failed to download %s, wget returned %d.\n", src, res);
 177         free(tmp_file_location);
 178         return -1;
 179       }
 180     }
 181 #endif
 182
 183     err = file_move(tmp_file_location, dest_file_name);
 184
 185     free(tmp_file_location);
 186
 187     return err;
 188 }
 189
 190 static int
 191 opkg_download_cache(const char *src, const char *dest_file_name,
 192         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(src, dest_file_name, cb, data, 0);
 200         goto out1;
 201     }
 202
 203     if(!file_is_dir(conf->cache)){
 204             opkg_msg(ERROR, "%s is not a directory.\n",
 205                             conf->cache);
 206             err = 1;
 207             goto out1;
 208     }
 209
 210     for (p = cache_name; *p; p++)
 211         if (*p == '/')
 212             *p = ',';   /* looks nicer than | or # */
 213
 214     sprintf_alloc(&cache_location, "%s/%s", conf->cache, cache_name);
 215     if (file_exists(cache_location))
 216         opkg_msg(NOTICE, "Copying %s.\n", cache_location);
 217     else {
 218        /* cache file with funky name not found, try simple name */
 219         free(cache_name);
 220         char *filename = strrchr(dest_file_name,'/');
 221         if (filename)
 222            cache_name = xstrdup(filename+1); // strip leading '/'
 223         else
 224            cache_name = xstrdup(dest_file_name);
 225         free(cache_location);
 226         sprintf_alloc(&cache_location, "%s/%s", conf->cache, cache_name);
 227         if (file_exists(cache_location))
 228            opkg_msg(NOTICE, "Copying %s.\n", cache_location);
 229         else  {
 230             err = opkg_download(src, cache_location, cb, data);
 231             if (err) {
 232                (void) unlink(cache_location);
 233                goto out2;
 234           }
 235         }
 236     }
 237
 238     err = file_copy(cache_location, dest_file_name);
 239
 240
 241 out2:
 242     free(cache_location);
 243 out1:
 244     free(cache_name);
 245     return err;
 246 }
 247
 248 int
 249 opkg_download_pkg(pkg_t *pkg, const char *dir)
 250 {
 251     int err;
 252     char *url;
 253     char *stripped_filename;
 254
 255     if (pkg->src == NULL) {
 256         opkg_msg(ERROR, "Package %s is not available from any configured src.\n",
 257                 pkg->name);
 258         return -1;
 259     }
 260     if (pkg->filename == NULL) {
 261         opkg_msg(ERROR, "Package %s does not have a valid filename field.\n",
 262                 pkg->name);
 263         return -1;
 264     }
 265
 266     sprintf_alloc(&url, "%s/%s", pkg->src->value, pkg->filename);
 267
 268     /* The pkg->filename might be something like
 269        "../../foo.opk". While this is correct, and exactly what we
 270        want to use to construct url above, here we actually need to
 271        use just the filename part, without any directory. */
 272
 273     stripped_filename = strrchr(pkg->filename, '/');
 274     if ( ! stripped_filename )
 275         stripped_filename = pkg->filename;
 276
 277     sprintf_alloc(&pkg->local_filename, "%s/%s", dir, stripped_filename);
 278
 279     err = opkg_download_cache(url, pkg->local_filename, NULL, NULL);
 280     free(url);
 281
 282     return err;
 283 }
 284
 285 /*
 286  * Downloads file from url, installs in package database, return package name.
 287  */
 288 int
 289 opkg_prepare_url_for_install(const char *url, char **namep)
 290 {
 291      int err = 0;
 292      pkg_t *pkg;
 293
 294      pkg = pkg_new();
 295
 296      if (str_starts_with(url, "http://")
 297          || str_starts_with(url, "ftp://")) {
 298           char *tmp_file;
 299           char *file_basec = xstrdup(url);
 300           char *file_base = basename(file_basec);
 301
 302           sprintf_alloc(&tmp_file, "%s/%s", conf->tmp_dir, file_base);
 303           err = opkg_download(url, tmp_file, NULL, NULL, 0);
 304           if (err)
 305                return err;
 306
 307           err = pkg_init_from_file(pkg, tmp_file);
 308           if (err)
 309                return err;
 310
 311           free(tmp_file);
 312           free(file_basec);
 313
 314      } else if (strcmp(&url[strlen(url) - 4], OPKG_PKG_EXTENSION) == 0
 315                 || strcmp(&url[strlen(url) - 4], IPKG_PKG_EXTENSION) == 0
 316                 || strcmp(&url[strlen(url) - 4], DPKG_PKG_EXTENSION) == 0) {
 317
 318           err = pkg_init_from_file(pkg, url);
 319           if (err)
 320                return err;
 321           opkg_msg(DEBUG2, "Package %s provided by hand (%s).\n",
 322                   pkg->name, pkg->local_filename);
 323           pkg->provided_by_hand = 1;
 324
 325      } else {
 326        pkg_deinit(pkg);
 327        free(pkg);
 328        return 0;
 329      }
 330
 331      pkg->dest = conf->default_dest;
 332      pkg->state_want = SW_INSTALL;
 333      pkg->state_flag |= SF_PREFER;
 334      hash_insert_pkg(pkg, 1);
 335
 336      if (namep) {
 337           *namep = pkg->name;
 338      }
 339      return 0;
 340 }
 341
 342 int
 343 opkg_verify_file (char *text_file, char *sig_file)
 344 {
 345 #if defined HAVE_GPGME
 346     if (conf->check_signature == 0 )
 347         return 0;
 348     int status = -1;
 349     gpgme_ctx_t ctx;
 350     gpgme_data_t sig, text, key;
 351     gpgme_error_t err;
 352     gpgme_verify_result_t result;
 353     gpgme_signature_t s;
 354     char *trusted_path = NULL;
 355
 356     gpgme_check_version (NULL);
 357
 358     err = gpgme_new (&ctx);
 359
 360     if (err)
 361         return -1;
 362
 363     sprintf_alloc(&trusted_path, "%s/%s", conf->offline_root, "/etc/opkg/trusted.gpg");
 364     err = gpgme_data_new_from_file (&key, trusted_path, 1);
 365     free (trusted_path);
 366     if (err)
 367     {
 368       return -1;
 369     }
 370     err = gpgme_op_import (ctx, key);
 371     if (err)
 372     {
 373       gpgme_data_release (key);
 374       return -1;
 375     }
 376     gpgme_data_release (key);
 377
 378     err = gpgme_data_new_from_file (&sig, sig_file, 1);
 379     if (err)
 380     {
 381         gpgme_release (ctx);
 382         return -1;
 383     }
 384
 385     err = gpgme_data_new_from_file (&text, text_file, 1);
 386     if (err)
 387     {
 388         gpgme_data_release (sig);
 389         gpgme_release (ctx);
 390         return -1;
 391     }
 392
 393     err = gpgme_op_verify (ctx, sig, text, NULL);
 394
 395     result = gpgme_op_verify_result (ctx);
 396     if (!result)
 397         return -1;
 398
 399     /* see if any of the signitures matched */
 400     s = result->signatures;
 401     while (s)
 402     {
 403         status = gpg_err_code (s->status);
 404         if (status == GPG_ERR_NO_ERROR)
 405             break;
 406         s = s->next;
 407     }
 408
 409
 410     gpgme_data_release (sig);
 411     gpgme_data_release (text);
 412     gpgme_release (ctx);
 413
 414     return status;
 415 #elif defined HAVE_OPENSSL
 416     X509_STORE *store = NULL;
 417     PKCS7 *p7 = NULL;
 418     BIO *in = NULL, *indata = NULL;
 419
 420     // Sig check failed by default !
 421     int status = -1;
 422
 423     openssl_init();
 424
 425     // Set-up the key store
 426     if(!(store = setup_verify(conf->signature_ca_file, conf->signature_ca_path))){
 427         opkg_msg(ERROR, "Can't open CA certificates.\n");
 428         goto verify_file_end;
 429     }
 430
 431     // Open a BIO to read the sig file
 432     if (!(in = BIO_new_file(sig_file, "rb"))){
 433         opkg_msg(ERROR, "Can't open signature file %s.\n", sig_file);
 434         goto verify_file_end;
 435     }
 436
 437     // Read the PKCS7 block contained in the sig file
 438     p7 = PEM_read_bio_PKCS7(in, NULL, NULL, NULL);
 439     if(!p7){
 440         opkg_msg(ERROR, "Can't read signature file %s (Corrupted ?).\n",
 441                 sig_file);
 442         goto verify_file_end;
 443     }
 444 #if defined(HAVE_PATHFINDER)
 445     if(conf->check_x509_path){
 446         if(!pkcs7_pathfinder_verify_signers(p7)){
 447             opkg_msg(ERROR, "pkcs7_pathfinder_verify_signers: "
 448                     "Path verification failed.\n");
 449             goto verify_file_end;
 450         }
 451     }
 452 #endif
 453
 454     // Open the Package file to authenticate
 455     if (!(indata = BIO_new_file(text_file, "rb"))){
 456         opkg_msg(ERROR, "Can't open file %s.\n", text_file);
 457         goto verify_file_end;
 458     }
 459
 460     // Let's verify the autenticity !
 461     if (PKCS7_verify(p7, NULL, store, indata, NULL, PKCS7_BINARY) != 1){
 462         // Get Off My Lawn!
 463         opkg_msg(ERROR, "Verification failure.\n");
 464     }else{
 465         // Victory !
 466         status = 0;
 467     }
 468
 469 verify_file_end:
 470     BIO_free(in);
 471     BIO_free(indata);
 472     PKCS7_free(p7);
 473     X509_STORE_free(store);
 474
 475     return status;
 476 #else
 477     /* mute `unused variable' warnings. */
 478     (void) sig_file;
 479     (void) text_file;
 480     (void) conf;
 481     return 0;
 482 #endif
 483 }
 484
 485
 486 #if defined(HAVE_OPENSSL) || defined(HAVE_SSLCURL)
 487 static void openssl_init(void){
 488     static int init = 0;
 489
 490     if(!init){
 491         OPENSSL_config(NULL);
 492         OpenSSL_add_all_algorithms();
 493         ERR_load_crypto_strings();
 494         init = 1;
 495     }
 496 }
 497
 498 #endif
 499
 500
 501 #if defined HAVE_OPENSSL
 502 static X509_STORE *
 503 setup_verify(char *CAfile, char *CApath)
 504 {
 505     X509_STORE *store = NULL;
 506     X509_LOOKUP *lookup = NULL;
 507
 508     if(!(store = X509_STORE_new())){
 509         // Something bad is happening...
 510         goto end;
 511     }
 512
 513     // adds the X509 file lookup method
 514     lookup = X509_STORE_add_lookup(store,X509_LOOKUP_file());
 515     if (lookup == NULL){
 516         goto end;
 517     }
 518
 519     // Autenticating against one CA file
 520     if (CAfile) {
 521         if(!X509_LOOKUP_load_file(lookup,CAfile,X509_FILETYPE_PEM)) {
 522             // Invalid CA => Bye bye
 523             opkg_msg(ERROR, "Error loading file %s.\n", CAfile);
 524             goto end;
 525         }
 526     } else {
 527         X509_LOOKUP_load_file(lookup,NULL,X509_FILETYPE_DEFAULT);
 528     }
 529
 530     // Now look into CApath directory if supplied
 531     lookup = X509_STORE_add_lookup(store,X509_LOOKUP_hash_dir());
 532     if (lookup == NULL){
 533         goto end;
 534     }
 535
 536     if (CApath) {
 537         if(!X509_LOOKUP_add_dir(lookup,CApath,X509_FILETYPE_PEM)) {
 538             opkg_msg(ERROR, "Error loading directory %s.\n", CApath);
 539             goto end;
 540         }
 541     } else {
 542         X509_LOOKUP_add_dir(lookup,NULL,X509_FILETYPE_DEFAULT);
 543     }
 544
 545     // All right !
 546     ERR_clear_error();
 547     return store;
 548
 549 end:
 550
 551     X509_STORE_free(store);
 552     return NULL;
 553
 554 }
 555
 556 #endif
 557
 558 #ifdef HAVE_CURL
 559 void opkg_curl_cleanup(void){
 560     if(curl != NULL){
 561         curl_easy_cleanup (curl);
 562         curl = NULL;
 563     }
 564 }
 565
 566 static CURL *
 567 opkg_curl_init(curl_progress_func cb, void *data)
 568 {
 569
 570     if(curl == NULL){
 571         curl = curl_easy_init();
 572
 573 #ifdef HAVE_SSLCURL
 574         openssl_init();
 575
 576         if (conf->ssl_engine) {
 577
 578             /* use crypto engine */
 579             if (curl_easy_setopt(curl, CURLOPT_SSLENGINE, conf->ssl_engine) != CURLE_OK){
 580                 opkg_msg(ERROR, "Can't set crypto engine '%s'.\n",
 581                         conf->ssl_engine);
 582
 583                 opkg_curl_cleanup();
 584                 return NULL;
 585             }
 586             /* set the crypto engine as default */
 587             if (curl_easy_setopt(curl, CURLOPT_SSLENGINE_DEFAULT, 1L) != CURLE_OK){
 588                 opkg_msg(ERROR, "Can't set crypto engine '%s' as default.\n",
 589                         conf->ssl_engine);
 590
 591                 opkg_curl_cleanup();
 592                 return NULL;
 593             }
 594         }
 595
 596         /* cert & key can only be in PEM case in the same file */
 597         if(conf->ssl_key_passwd){
 598             if (curl_easy_setopt(curl, CURLOPT_SSLKEYPASSWD, conf->ssl_key_passwd) != CURLE_OK)
 599             {
 600                 opkg_msg(DEBUG, "Failed to set key password.\n");
 601             }
 602         }
 603
 604         /* sets the client certificate and its type */
 605         if(conf->ssl_cert_type){
 606             if (curl_easy_setopt(curl, CURLOPT_SSLCERTTYPE, conf->ssl_cert_type) != CURLE_OK)
 607             {
 608                 opkg_msg(DEBUG, "Failed to set certificate format.\n");
 609             }
 610         }
 611         /* SSL cert name isn't mandatory */
 612         if(conf->ssl_cert){
 613                 curl_easy_setopt(curl, CURLOPT_SSLCERT, conf->ssl_cert);
 614         }
 615
 616         /* sets the client key and its type */
 617         if(conf->ssl_key_type){
 618             if (curl_easy_setopt(curl, CURLOPT_SSLKEYTYPE, conf->ssl_key_type) != CURLE_OK)
 619             {
 620                 opkg_msg(DEBUG, "Failed to set key format.\n");
 621             }
 622         }
 623         if(conf->ssl_key){
 624             if (curl_easy_setopt(curl, CURLOPT_SSLKEY, conf->ssl_key) != CURLE_OK)
 625             {
 626                 opkg_msg(DEBUG, "Failed to set key.\n");
 627             }
 628         }
 629
 630         /* Should we verify the peer certificate ? */
 631         if(conf->ssl_dont_verify_peer){
 632             /*
 633              * CURLOPT_SSL_VERIFYPEER default is nonzero (curl => 7.10)
 634              */
 635             curl_easy_setopt(curl, CURLOPT_SSL_VERIFYPEER, 0);
 636         }else{
 637 #ifdef HAVE_PATHFINDER
 638             if(conf->check_x509_path){
 639                 if (curl_easy_setopt(curl, CURLOPT_SSL_CTX_FUNCTION, curl_ssl_ctx_function) != CURLE_OK){
 640                     opkg_msg(DEBUG, "Failed to set ssl path verification callback.\n");
 641                 }else{
 642                     curl_easy_setopt(curl, CURLOPT_SSL_CTX_DATA, NULL);
 643                 }
 644             }
 645 #endif
 646         }
 647
 648         /* certification authority file and/or path */
 649         if(conf->ssl_ca_file){
 650             curl_easy_setopt(curl, CURLOPT_CAINFO, conf->ssl_ca_file);
 651         }
 652         if(conf->ssl_ca_path){
 653             curl_easy_setopt(curl, CURLOPT_CAPATH, conf->ssl_ca_path);
 654         }
 655 #endif
 656
 657         curl_easy_setopt (curl, CURLOPT_FOLLOWLOCATION, 1);
 658         curl_easy_setopt (curl, CURLOPT_FAILONERROR, 1);
 659         if (conf->http_proxy || conf->ftp_proxy)
 660         {
 661             char *userpwd;
 662             sprintf_alloc (&userpwd, "%s:%s", conf->proxy_user,
 663                     conf->proxy_passwd);
 664             curl_easy_setopt(curl, CURLOPT_PROXYUSERPWD, userpwd);
 665             free (userpwd);
 666         }
 667     }
 668
 669     curl_easy_setopt (curl, CURLOPT_NOPROGRESS, (cb == NULL));
 670     if (cb)
 671     {
 672         curl_easy_setopt (curl, CURLOPT_PROGRESSDATA, data);
 673         curl_easy_setopt (curl, CURLOPT_PROGRESSFUNCTION, cb);
 674     }
 675
 676     return curl;
 677
 678 }
 679 #endif