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 3 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, see <http://www.gnu.org/licenses/>.
  19  */
  20
  21 #include <config.h>
  22 #include <errno.h>
  23 #include <stdio.h>
  24 #include <stdlib.h>
  25 #include <string.h>
  26 #include <ctype.h>
  27 #include <unistd.h>
  28 #ifdef HAVE_DOSISH_SYSTEM
  29 #include <fcntl.h> /* for setmode() */
  30 #endif
  31 #ifdef HAVE_LIBREADLINE
  32 #define GNUPG_LIBREADLINE_H_INCLUDED
  33 #include <readline/readline.h>
  34 #endif
  35
  36 #define INCLUDED_BY_MAIN_MODULE 1
  37 #include "gpg.h"
  38 #include "packet.h"
  39 #include "iobuf.h"
  40 #include "util.h"
  41 #include "main.h"
  42 #include "options.h"
  43 #include "keydb.h"
  44 #include "trustdb.h"
  45 #include "cipher.h"
  46 #include "filter.h"
  47 #include "ttyio.h"
  48 #include "i18n.h"
  49 #include "sysutils.h"
  50 #include "status.h"
  51 #include "call-agent.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
 113 int
 114 main( int argc, char **argv )
 115 {
 116     ARGPARSE_ARGS pargs;
 117     int rc=0;
 118     strlist_t sl;
 119     strlist_t nrings=NULL;
 120     unsigned configlineno;
 121
 122     set_strusage (my_strusage);
 123     log_set_prefix ("gpgv", 1);
 124
 125     /* Make sure that our subsystems are ready.  */
 126     init_common_subsystems ();
 127
 128     gnupg_init_signals (0, NULL);
 129     i18n_init();
 130
 131     opt.command_fd = -1; /* no command fd */
 132     opt.pgp2_workarounds = 1;
 133     opt.keyserver_options.options|=KEYSERVER_AUTO_KEY_RETRIEVE;
 134     opt.trust_model = TM_ALWAYS;
 135     opt.batch = 1;
 136
 137     opt.homedir = default_homedir ();
 138
 139     tty_no_terminal(1);
 140     tty_batchmode(1);
 141     disable_dotlock();
 142
 143     pargs.argc = &argc;
 144     pargs.argv = &argv;
 145     pargs.flags=  1;  /* do not remove the args */
 146     while( optfile_parse( NULL, NULL, &configlineno, &pargs, opts) ) {
 147         switch( pargs.r_opt ) {
 148           case oQuiet: opt.quiet = 1; break;
 149           case oVerbose:
 150             opt.verbose++;
 151             opt.list_sigs=1;
 152             gcry_control (GCRYCTL_SET_VERBOSITY, (int)opt.verbose);
 153             break;
 154           case oKeyring: append_to_strlist( &nrings, pargs.r.ret_str); break;
 155           case oStatusFD: set_status_fd( pargs.r.ret_int ); break;
 156           case oLoggerFD:
 157             log_set_fd (translate_sys2libc_fd_int (pargs.r.ret_int, 1));
 158             break;
 159           case oHomedir: opt.homedir = pargs.r.ret_str; break;
 160           case oIgnoreTimeConflict: opt.ignore_time_conflict = 1; break;
 161           default : pargs.err = 2; break;
 162         }
 163     }
 164
 165     if( log_get_errorcount(0) )
 166         g10_exit(2);
 167
 168      if( opt.verbose > 1 )
 169         set_packet_list_mode(1);
 170
 171     if( !nrings )  /* no keyring given: use default one */
 172         keydb_add_resource ("trustedkeys" EXTSEP_S "gpg", 0, 0);
 173     for(sl = nrings; sl; sl = sl->next )
 174         keydb_add_resource (sl->d, 0, 0 );
 175
 176     FREE_STRLIST (nrings);
 177
 178     if( (rc = verify_signatures( argc, argv ) ))
 179         log_error("verify signatures failed: %s\n", g10_errstr(rc) );
 180
 181     /* cleanup */
 182     g10_exit(0);
 183     return 8; /*NEVER REACHED*/
 184 }
 185
 186
 187 void
 188 g10_exit( int rc )
 189 {
 190     rc = rc? rc : log_get_errorcount(0)? 2 :
 191                         g10_errors_seen? 1 : 0;
 192     exit(rc );
 193 }
 194
 195
 196 /* Stub:
 197  * We have to override the trustcheck from pkclist.c becuase
 198  * this utility assumes that all keys in the keyring are trustworthy
 199  */
 200 int
 201 check_signatures_trust( PKT_signature *sig )
 202 {
 203     return 0;
 204 }
 205
 206 void
 207 read_trust_options(byte *trust_model,ulong *created,ulong *nextcheck,
 208                    byte *marginals,byte *completes,byte *cert_depth) {}
 209
 210 /* Stub:
 211  * We don't have the trustdb , so we have to provide some stub functions
 212  * instead
 213  */
 214
 215 int
 216 cache_disabled_value(PKT_public_key *pk)
 217 {
 218   return 0;
 219 }
 220
 221 void
 222 check_trustdb_stale(void) {}
 223
 224 int
 225 get_validity_info (PKT_public_key *pk, PKT_user_id *uid)
 226 {
 227     return '?';
 228 }
 229
 230 unsigned int
 231 get_validity (PKT_public_key *pk, PKT_user_id *uid)
 232 {
 233   return 0;
 234 }
 235
 236 const char *
 237 trust_value_to_string (unsigned int value)
 238 {
 239   return "err";
 240 }
 241
 242 const char *
 243 uid_trust_string_fixed(PKT_public_key *key,PKT_user_id *uid)
 244 {
 245   return "err";
 246 }
 247
 248 int
 249 get_ownertrust_info (PKT_public_key *pk)
 250 {
 251     return '?';
 252 }
 253
 254 unsigned int
 255 get_ownertrust (PKT_public_key *pk)
 256 {
 257     return TRUST_UNKNOWN;
 258 }
 259
 260
 261 /* Stubs:
 262  * Because we only work with trusted keys, it does not make sense to
 263  * get them from a keyserver
 264  */
 265
 266 struct keyserver_spec *
 267 keyserver_match(struct keyserver_spec *spec) { return NULL; }
 268
 269 int
 270 keyserver_import_keyid( u32 *keyid, void *dummy )
 271 {
 272     return -1;
 273 }
 274
 275 int
 276 keyserver_import_cert(const char *name) { return -1; }
 277
 278 int
 279 keyserver_import_pka(const char *name,unsigned char *fpr) { return -1; }
 280
 281 int
 282 keyserver_import_name(const char *name,struct keyserver_spec *spec)
 283 {
 284   return -1;
 285 }
 286
 287 int
 288 keyserver_import_ldap(const char *name) { return -1; }
 289
 290 /* Stub:
 291  * No encryption here but mainproc links to these functions.
 292  */
 293 int
 294 get_session_key( PKT_pubkey_enc *k, DEK *dek )
 295 {
 296     return G10ERR_GENERAL;
 297 }
 298 /* Stub: */
 299 int
 300 get_override_session_key( DEK *dek, const char *string )
 301 {
 302     return G10ERR_GENERAL;
 303 }
 304 /* Stub: */
 305 int
 306 decrypt_data( void *procctx, PKT_encrypted *ed, DEK *dek )
 307 {
 308     return G10ERR_GENERAL;
 309 }
 310
 311
 312 /* Stub:
 313  * No interactive commnds, so we don't need the helptexts
 314  */
 315 void
 316 display_online_help( const char *keyword )
 317 {
 318 }
 319
 320 /* Stub:
 321  * We don't use secret keys, but getkey.c links to this
 322  */
 323 int
 324 check_secret_key( PKT_secret_key *sk, int n )
 325 {
 326     return G10ERR_GENERAL;
 327 }
 328
 329 /* Stub:
 330  * No secret key, so no passphrase needed
 331  */
 332 DEK *
 333 passphrase_to_dek( u32 *keyid, int pubkey_algo,
 334                    int cipher_algo, STRING2KEY *s2k, int mode,
 335                    const char *tmp, int *canceled)
 336 {
 337   if (canceled)
 338     *canceled = 0;
 339   return NULL;
 340 }
 341
 342 struct keyserver_spec *parse_preferred_keyserver(PKT_signature *sig) {return NULL;}
 343 struct keyserver_spec *parse_keyserver_uri(const char *uri,int require_scheme,
 344                                            const char *configname,
 345                                            unsigned int configlineno)
 346 {
 347   return NULL;
 348 }
 349
 350 void free_keyserver_spec(struct keyserver_spec *keyserver) {}
 351
 352 /* Stubs to avoid linking to photoid.c */
 353 void show_photos(const struct user_attribute *attrs,int count,PKT_public_key *pk) {}
 354 int parse_image_header(const struct user_attribute *attr,byte *type,u32 *len) {return 0;}
 355 char *image_type_to_string(byte type,int string) {return NULL;}
 356
 357 #ifdef ENABLE_CARD_SUPPORT
 358 int agent_scd_getattr (const char *name, struct agent_card_info_s *info) {return 0;}
 359 #endif /* ENABLE_CARD_SUPPORT */
 360
 361 /* Stubs to void linking to ../cipher/cipher.c */
 362 const char *cipher_algo_to_string( int algo ) { return "?";}
 363 void disable_cipher_algo( int algo ) {}
 364 int check_cipher_algo( int algo ) { return -1;}
 365 unsigned int cipher_get_keylen( int algo ) { return 0; }
 366 unsigned int cipher_get_blocksize( int algo ) {return 0;}
 367 gcry_cipher_hd_t cipher_open( int algo, int mode, int secure ) { return NULL;}
 368 void cipher_close( gcry_cipher_hd_t c ) {}
 369 int cipher_setkey( gcry_cipher_hd_t c, byte *key, unsigned keylen ) { return -1;}
 370 void cipher_setiv( gcry_cipher_hd_t c, const byte *iv, unsigned ivlen ){}
 371 void cipher_encrypt( gcry_cipher_hd_t c, byte *outbuf,
 372                      byte *inbuf, unsigned nbytes ) {}
 373 void cipher_decrypt( gcry_cipher_hd_t c, byte *outbuf,
 374                      byte *inbuf, unsigned nbytes ) {}
 375 void cipher_sync( gcry_cipher_hd_t c ) {}
 376
 377
 378
 379 /* We do not do any locking, so use these stubs here */
 380 void disable_dotlock(void) {}
 381 DOTLOCK create_dotlock( const char *file_to_lock ) { return NULL; }
 382 void destroy_dotlock (DOTLOCK h) {}
 383 int make_dotlock( DOTLOCK h, long timeout ) { return 0;}
 384 int release_dotlock( DOTLOCK h ) {return 0;}
 385 void remove_lockfiles(void) {}