g10/gpgv.c

   1 /* gpgv.c - The GnuPG signature verify utility
   2  * Copyright (C) 1998, 1999, 2000, 2001, 2002, 2005,
   3  *               2006 Free Software Foundation, Inc.
   4  *
   5  * This file is part of GnuPG.
   6  *
   7  * GnuPG is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License as published by
   9  * the Free Software Foundation; either version 2 of the License, or
  10  * (at your option) any later version.
  11  *
  12  * GnuPG is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License
  18  * along with this program; if not, write to the Free Software
  19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
  20  * USA.
  21  */
  22
  23 #include <config.h>
  24 #include <errno.h>
  25 #include <stdio.h>
  26 #include <stdlib.h>
  27 #include <string.h>
  28 #include <ctype.h>
  29 #include <unistd.h>
  30 #ifdef HAVE_DOSISH_SYSTEM
  31 #include <fcntl.h> /* for setmode() */
  32 #endif
  33 #ifdef HAVE_LIBREADLINE
  34 #include <stdio.h>
  35 #include <readline/readline.h>
  36 #endif
  37
  38 #define INCLUDED_BY_MAIN_MODULE 1
  39 #include "gpg.h"
  40 #include "packet.h"
  41 #include "iobuf.h"
  42 #include "util.h"
  43 #include "main.h"
  44 #include "options.h"
  45 #include "keydb.h"
  46 #include "trustdb.h"
  47 #include "cipher.h"
  48 #include "filter.h"
  49 #include "ttyio.h"
  50 #include "i18n.h"
  51 #include "status.h"
  52
  53
  54 enum cmd_and_opt_values { aNull = 0,
  55     oQuiet        = 'q',
  56     oVerbose      = 'v',
  57     oBatch        = 500,
  58     oKeyring,
  59     oIgnoreTimeConflict,
  60     oStatusFD,
  61     oLoggerFD,
  62     oHomedir,
  63 aTest };
  64
  65
  66 static ARGPARSE_OPTS opts[] = {
  67
  68     { 301, NULL, 0, N_("@\nOptions:\n ") },
  69
  70     { oVerbose, "verbose",   0, N_("verbose") },
  71     { oQuiet,   "quiet",     0, N_("be somewhat more quiet") },
  72     { oKeyring, "keyring"   ,2, N_("take the keys from this keyring")},
  73     { oIgnoreTimeConflict, "ignore-time-conflict", 0,
  74                            N_("make timestamp conflicts only a warning") },
  75     { oStatusFD, "status-fd" ,1, N_("|FD|write status info to this FD") },
  76     { oLoggerFD, "logger-fd",1, "@" },
  77     { oHomedir, "homedir", 2, "@" },   /* defaults to "~/.gnupg" */
  78
  79 {0} };
  80
  81
  82
  83 int g10_errors_seen = 0;
  84
  85 static const char *
  86 my_strusage( int level )
  87 {
  88     const char *p;
  89     switch( level ) {
  90       case 11: p = "gpgv (GnuPG)";
  91         break;
  92       case 13: p = VERSION; break;
  93       case 17: p = PRINTABLE_OS_NAME; break;
  94       case 19: p =
  95             _("Please report bugs to <gnupg-bugs@gnu.org>.\n");
  96         break;
  97       case 1:
  98       case 40:  p =
  99             _("Usage: gpgv [options] [files] (-h for help)");
 100         break;
 101       case 41:  p =
 102             _("Syntax: gpg [options] [files]\n"
 103               "Check signatures against known trusted keys\n");
 104         break;
 105
 106       default:  p = NULL;
 107     }
 108     return p;
 109 }
 110
 111
 112 static void
 113 i18n_init(void)
 114 {
 115 #ifdef USE_SIMPLE_GETTEXT
 116   set_gettext_file (PACKAGE_GT, "Software\\GNU\\GnuPG");
 117 #else
 118 #ifdef ENABLE_NLS
 119   setlocale (LC_ALL, "");
 120   bindtextdomain (PACKAGE_GT, LOCALEDIR);
 121   textdomain (PACKAGE_GT);
 122 #endif
 123 #endif
 124 }
 125
 126
 127
 128 int
 129 main( int argc, char **argv )
 130 {
 131     ARGPARSE_ARGS pargs;
 132     int rc=0;
 133     STRLIST sl;
 134     STRLIST nrings=NULL;
 135     unsigned configlineno;
 136
 137     set_strusage (my_strusage);
 138     log_set_prefix ("gpgv", 1);
 139     gnupg_init_signals (0, NULL);
 140     i18n_init();
 141     opt.command_fd = -1; /* no command fd */
 142     opt.pgp2_workarounds = 1;
 143     opt.keyserver_options.options|=KEYSERVER_AUTO_KEY_RETRIEVE;
 144     opt.trust_model = TM_ALWAYS;
 145     opt.batch = 1;
 146
 147     opt.homedir = default_homedir ();
 148
 149     tty_no_terminal(1);
 150     tty_batchmode(1);
 151     disable_dotlock();
 152
 153     set_native_charset (NULL); /* Try to auto set the character set */
 154
 155     pargs.argc = &argc;
 156     pargs.argv = &argv;
 157     pargs.flags=  1;  /* do not remove the args */
 158     while( optfile_parse( NULL, NULL, &configlineno, &pargs, opts) ) {
 159         switch( pargs.r_opt ) {
 160           case oQuiet: opt.quiet = 1; break;
 161           case oVerbose:
 162             opt.verbose++;
 163             opt.list_sigs=1;
 164             gcry_control (GCRYCTL_SET_VERBOSITY, (int)opt.verbose);
 165             break;
 166           case oKeyring: append_to_strlist( &nrings, pargs.r.ret_str); break;
 167           case oStatusFD: set_status_fd( pargs.r.ret_int ); break;
 168           case oLoggerFD:
 169             log_set_fd (iobuf_translate_file_handle (pargs.r.ret_int, 1));
 170             break;
 171           case oHomedir: opt.homedir = pargs.r.ret_str; break;
 172           case oIgnoreTimeConflict: opt.ignore_time_conflict = 1; break;
 173           default : pargs.err = 2; break;
 174         }
 175     }
 176
 177     if( log_get_errorcount(0) )
 178         g10_exit(2);
 179
 180      if( opt.verbose > 1 )
 181         set_packet_list_mode(1);
 182
 183     if( !nrings )  /* no keyring given: use default one */
 184         keydb_add_resource ("trustedkeys" EXTSEP_S "gpg", 0, 0);
 185     for(sl = nrings; sl; sl = sl->next )
 186         keydb_add_resource (sl->d, 0, 0 );
 187
 188     FREE_STRLIST(nrings);
 189
 190     if( (rc = verify_signatures( argc, argv ) ))
 191         log_error("verify signatures failed: %s\n", g10_errstr(rc) );
 192
 193     /* cleanup */
 194     g10_exit(0);
 195     return 8; /*NEVER REACHED*/
 196 }
 197
 198
 199 void
 200 g10_exit( int rc )
 201 {
 202     rc = rc? rc : log_get_errorcount(0)? 2 :
 203                         g10_errors_seen? 1 : 0;
 204     exit(rc );
 205 }
 206
 207
 208 /* Stub:
 209  * We have to override the trustcheck from pkclist.c becuase
 210  * this utility assumes that all keys in the keyring are trustworthy
 211  */
 212 int
 213 check_signatures_trust( PKT_signature *sig )
 214 {
 215     return 0;
 216 }
 217
 218 void
 219 read_trust_options(byte *trust_model,ulong *created,ulong *nextcheck,
 220                    byte *marginals,byte *completes,byte *cert_depth) {}
 221
 222 /* Stub:
 223  * We don't have the trustdb , so we have to provide some stub functions
 224  * instead
 225  */
 226
 227 int
 228 cache_disabled_value(PKT_public_key *pk)
 229 {
 230   return 0;
 231 }
 232
 233 void
 234 check_trustdb_stale(void) {}
 235
 236 int
 237 get_validity_info (PKT_public_key *pk, PKT_user_id *uid)
 238 {
 239     return '?';
 240 }
 241
 242 unsigned int
 243 get_validity (PKT_public_key *pk, PKT_user_id *uid)
 244 {
 245   return 0;
 246 }
 247
 248 const char *
 249 trust_value_to_string (unsigned int value)
 250 {
 251   return "err";
 252 }
 253
 254 const char *
 255 uid_trust_string_fixed(PKT_public_key *key,PKT_user_id *uid)
 256 {
 257   return "err";
 258 }
 259
 260 int
 261 get_ownertrust_info (PKT_public_key *pk)
 262 {
 263     return '?';
 264 }
 265
 266 unsigned int
 267 get_ownertrust (PKT_public_key *pk)
 268 {
 269     return TRUST_UNKNOWN;
 270 }
 271
 272
 273 /* Stubs:
 274  * Because we only work with trusted keys, it does not make sense to
 275  * get them from a keyserver
 276  */
 277
 278 struct keyserver_spec *
 279 keyserver_match(struct keyserver_spec *spec) { return NULL; }
 280
 281 int
 282 keyserver_import_keyid( u32 *keyid, void *dummy )
 283 {
 284     return -1;
 285 }
 286
 287 int
 288 keyserver_import_cert(const char *name) { return -1; }
 289
 290 int
 291 keyserver_import_pka(const char *name,unsigned char *fpr) { return -1; }
 292
 293 int
 294 keyserver_import_name(const char *name,struct keyserver_spec *spec)
 295 {
 296   return -1;
 297 }
 298
 299 int
 300 keyserver_import_ldap(const char *name) { return -1; }
 301
 302 /* Stub:
 303  * No encryption here but mainproc links to these functions.
 304  */
 305 int
 306 get_session_key( PKT_pubkey_enc *k, DEK *dek )
 307 {
 308     return G10ERR_GENERAL;
 309 }
 310 /* Stub: */
 311 int
 312 get_override_session_key( DEK *dek, const char *string )
 313 {
 314     return G10ERR_GENERAL;
 315 }
 316 /* Stub: */
 317 int
 318 decrypt_data( void *procctx, PKT_encrypted *ed, DEK *dek )
 319 {
 320     return G10ERR_GENERAL;
 321 }
 322
 323
 324 /* Stub:
 325  * No interactive commnds, so we don't need the helptexts
 326  */
 327 void
 328 display_online_help( const char *keyword )
 329 {
 330 }
 331
 332 /* Stub:
 333  * We don't use secret keys, but getkey.c links to this
 334  */
 335 int
 336 check_secret_key( PKT_secret_key *sk, int n )
 337 {
 338     return G10ERR_GENERAL;
 339 }
 340
 341 /* Stub:
 342  * No secret key, so no passphrase needed
 343  */
 344 DEK *
 345 passphrase_to_dek( u32 *keyid, int pubkey_algo,
 346                    int cipher_algo, STRING2KEY *s2k, int mode,
 347                    const char *tmp, int *canceled)
 348 {
 349   if (canceled)
 350     *canceled = 0;
 351   return NULL;
 352 }
 353
 354 struct keyserver_spec *parse_preferred_keyserver(PKT_signature *sig) {return NULL;}
 355 struct keyserver_spec *parse_keyserver_uri(const char *uri,int require_scheme,
 356                                            const char *configname,
 357                                            unsigned int configlineno)
 358 {
 359   return NULL;
 360 }
 361
 362 void free_keyserver_spec(struct keyserver_spec *keyserver) {}
 363
 364 /* Stubs to avoid linking to photoid.c */
 365 void show_photos(const struct user_attribute *attrs,int count,PKT_public_key *pk) {}
 366 int parse_image_header(const struct user_attribute *attr,byte *type,u32 *len) {return 0;}
 367 char *image_type_to_string(byte type,int string) {return NULL;}
 368
 369 #ifdef ENABLE_CARD_SUPPORT
 370 int agent_scd_getattr (const char *name, struct agent_card_info_s *info) {return 0;}
 371 #endif /* ENABLE_CARD_SUPPORT */
 372
 373 /* Stubs to void linking to ../cipher/cipher.c */
 374 const char *cipher_algo_to_string( int algo ) { return "?";}
 375 void disable_cipher_algo( int algo ) {}
 376 int check_cipher_algo( int algo ) { return -1;}
 377 unsigned int cipher_get_keylen( int algo ) { return 0; }
 378 unsigned int cipher_get_blocksize( int algo ) {return 0;}
 379 gcry_cipher_hd_t cipher_open( int algo, int mode, int secure ) { return NULL;}
 380 void cipher_close( gcry_cipher_hd_t c ) {}
 381 int cipher_setkey( gcry_cipher_hd_t c, byte *key, unsigned keylen ) { return -1;}
 382 void cipher_setiv( gcry_cipher_hd_t c, const byte *iv, unsigned ivlen ){}
 383 void cipher_encrypt( gcry_cipher_hd_t c, byte *outbuf,
 384                      byte *inbuf, unsigned nbytes ) {}
 385 void cipher_decrypt( gcry_cipher_hd_t c, byte *outbuf,
 386                      byte *inbuf, unsigned nbytes ) {}
 387 void cipher_sync( gcry_cipher_hd_t c ) {}
 388
 389
 390 /* Stubs to avoid linking to ../util/ttyio.c */
 391 int tty_batchmode( int onoff ) { return 0; }
 392 void tty_printf( const char *fmt, ... ) { }
 393 void tty_fprintf (FILE *fp, const char *fmt, ... ) { }
 394 void tty_print_string( const byte *p, size_t n ) { }
 395 void tty_print_utf8_string( const byte *p, size_t n ) {}
 396 void tty_print_utf8_string2( const byte *p, size_t n, size_t max_n ) {}
 397 char *tty_get( const char *prompt ) { return NULL;}
 398 char *tty_get_hidden( const char *prompt ) {return NULL; }
 399 void tty_kill_prompt(void) {}
 400 int tty_get_answer_is_yes( const char *prompt ) {return 0;}
 401 int tty_no_terminal(int onoff) {return 0;}
 402 #ifdef HAVE_LIBREADLINE
 403 void tty_enable_completion(rl_completion_func_t *completer) {}
 404 void tty_disable_completion(void) {}
 405 #endif
 406
 407 /* We do not do any locking, so use these stubs here */
 408 void disable_dotlock(void) {}
 409 DOTLOCK create_dotlock( const char *file_to_lock ) { return NULL; }
 410 void destroy_dotlock (DOTLOCK h) {}
 411 int make_dotlock( DOTLOCK h, long timeout ) { return 0;}
 412 int release_dotlock( DOTLOCK h ) {return 0;}
 413 void remove_lockfiles(void) {}