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gnupg/g10/g10.c

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/* g10.c - The GNUPG utility (main for gpg)
* Copyright (C) 1998 Free Software Foundation, Inc.
*
* This file is part of GNUPG.
*
* GNUPG is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* GNUPG is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
*/
#include <config.h>
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include "packet.h"
#include "iobuf.h"
#include "memory.h"
#include "util.h"
#include "main.h"
#include "options.h"
#include "keydb.h"
#include "mpi.h"
#include "cipher.h"
#include "filter.h"
#include "trustdb.h"
#include "ttyio.h"
#include "i18n.h"
#include "status.h"
static ARGPARSE_OPTS opts[] = {
{ 300, NULL, 0, N_("\vCommands:\n ") },
{ 's', "sign", 0, N_("make a signature")},
{ 539, "clearsign", 0, N_("make a clear text signature") },
{ 'b', "detach-sign", 0, N_("make a detached signature")},
{ 'e', "encrypt", 0, N_("encrypt data")},
{ 'c', "symmetric", 0, N_("encryption only with symmetric cipher")},
{ 507, "store", 0, N_("store only")},
{ 'd', "decrypt", 0, N_("decrypt data (default)")},
{ 'k', "list-keys", 0, N_("list keys")},
{ 508, "check-keys",0, N_("check signatures on a key in the keyring")},
{ 515, "fingerprint", 0, N_("show the fingerprints")},
{ 521, "list-packets",0,N_("list only the sequence of packets")},
{ 503, "gen-key", 0, N_("generate a new key pair")},
{ 506, "sign-key" ,0, N_("make a signature on a key in the keyring")},
{ 505, "delete-key",0, N_("remove key from the public keyring")},
{ 524, "edit-sig" ,0, N_("edit a key signature")},
{ 525, "change-passphrase", 0, N_("change the passphrase of your secret keyring")},
{ 542, "gen-revoke",0, N_("generate a revocation certificate")},
{ 537, "export" , 0, N_("export keys") },
{ 530, "import", 0 , N_("import/merge keys")},
{ 301, NULL, 0, N_("\v\nOptions:\n ") },
{ 'a', "armor", 0, N_("create ascii armored output")},
{ 'o', "output", 2, N_("use as output file")},
{ 'u', "local-user",2, N_("use this user-id to sign or decrypt")},
{ 'r', "remote-user", 2, N_("use this user-id for encryption")},
{ 'v', "verbose", 0, N_("verbose") },
{ 'z', NULL, 1, N_("set compress level (0 disables)") },
{ 't', "textmode", 0, N_("use canonical text mode")},
{ 'n', "dry-run", 0, N_("don't make any changes") },
{ 500, "batch", 0, N_("batch mode: never ask")},
{ 501, "yes", 0, N_("assume yes on most questions")},
{ 502, "no", 0, N_("assume no on most questions")},
{ 509, "keyring" ,2, N_("add this keyring to the list of keyrings")},
{ 517, "secret-keyring" ,2, N_("add this secret keyring to the list")},
{ 518, "options" , 2, N_("read options from file")},
{ 510, "debug" ,4|16, N_("set debugging flags")},
{ 511, "debug-all" ,0, N_("enable full debugging")},
{ 512, "status-fd" ,1, N_("write status info to this fd") },
{ 534, "no-comment", 0, N_("do not write comment packets")},
{ 535, "completes-needed", 1, N_("(default is 1)")},
{ 536, "marginals-needed", 1, N_("(default is 3)")},
{ 527, "cipher-algo", 2 , N_("select default cipher algorithm")},
{ 528, "pubkey-algo", 2 , N_("select default puplic key algorithm")},
{ 529, "digest-algo", 2 , N_("select default message digest algorithm")},
{ 302, NULL, 0, N_("\v\nExamples:\n\n"
" -se -r Bob [file] sign and encrypt for user Bob\n"
" -sat [file] make a clear text signature\n"
" -sb [file] make a detached signature\n"
" -k [userid] show keys\n"
" -kc [userid] show fingerprint\n" ) },
/* hidden options */
{ 532, "quick-random", 0, "\r"},
{ 526, "no-verbose", 0, "\r"},
{ 538, "trustdb-name", 2, "\r" },
{ 540, "no-secmem-warning", 0, "\r" }, /* used only by regression tests */
{ 519, "no-armor", 0, "\r"},
{ 520, "no-default-keyring", 0, "\r" },
{ 522, "no-greeting", 0, "\r" },
{ 523, "passphrase-fd",1, "\r" },
{ 541, "no-operation", 0, "\r" }, /* used by regression tests */
{ 543, "no-options", 0, "\r" }, /* shortcut for --options /dev/null */
{ 544, "homedir", 2, "\r" }, /* defaults to "~/.gnupg" */
{ 545, "no-batch", 0, "\r" },
{0} };
enum cmd_values { aNull = 0,
aSym, aStore, aEncr, aKeygen, aSign, aSignEncr,
aSignKey, aClearsign, aListPackets, aEditSig,
aKMode, aKModeC, aChangePass, aImport,
aExport, aCheckKeys, aGenRevoke,
aNOP };
static char *build_list( const char *text,
const char *(*mapf)(int), int (*chkf)(int) );
static void set_cmd( enum cmd_values *ret_cmd,
enum cmd_values new_cmd );
const char *
strusage( int level )
{
static char *digests, *pubkeys, *ciphers;
const char *p;
switch( level ) {
case 11: p = "gpg (GNUPG)"; break;
case 13: p = VERSION; break;
case 17: p = PRINTABLE_OS_NAME; break;
case 19: p = _(
"Please report bugs to <gnupg-bugs@isil.d.shuttle.de>.\n"
); break;
case 1:
case 40: p = _(
"Usage: gpg [options] [files] (-h for help)"
); break;
case 41: p = _(
"Syntax: gpg [options] [files]\n"
"sign, check, encrypt or decrypt\n"
"default operation depends on the input data\n"
); break;
case 31: p = "\n"; break;
case 32:
if( !ciphers )
ciphers = build_list("Supported ciphers: ", cipher_algo_to_string,
check_cipher_algo );
p = ciphers;
break;
case 33:
if( !pubkeys )
pubkeys = build_list("Supported pubkeys: ", pubkey_algo_to_string,
check_pubkey_algo );
p = pubkeys;
break;
case 34:
if( !digests )
digests = build_list("Supported digests: ", digest_algo_to_string,
check_digest_algo );
p = digests;
break;
default: p = default_strusage(level);
}
return p;
}
static char *
build_list( const char *text, const char * (*mapf)(int), int (*chkf)(int) )
{
int i;
const char *s;
size_t n=strlen(text)+2;
char *list, *p;
for(i=1; i < 100; i++ )
if( !chkf(i) && (s=mapf(i)) )
n += strlen(s) + 2;
list = m_alloc( 21 + n ); *list = 0;
for(p=NULL, i=1; i < 100; i++ ) {
if( !chkf(i) && (s=mapf(i)) ) {
if( !p )
p = stpcpy( list, text );
else
p = stpcpy( p, ", ");
p = stpcpy(p, s );
}
}
if( p )
p = stpcpy(p, "\n" );
return list;
}
static void
i18n_init(void)
{
#ifdef HAVE_LIBINTL
#ifdef HAVE_LC_MESSAGES
setlocale( LC_MESSAGES, "" );
#else
setlocale( LC_ALL, "" );
#endif
bindtextdomain( PACKAGE, G10_LOCALEDIR );
textdomain( PACKAGE );
#endif
}
static void
wrong_args( const char *text)
{
fputs(_("usage: gpg [options] "),stderr);
fputs(text,stderr);
putc('\n',stderr);
g10_exit(2);
}
static void
set_debug(void)
{
if( opt.debug & DBG_MEMORY_VALUE )
memory_debug_mode = 1;
if( opt.debug & DBG_MEMSTAT_VALUE )
memory_stat_debug_mode = 1;
if( opt.debug & DBG_MPI_VALUE )
mpi_debug_mode = 1;
if( opt.debug & DBG_CIPHER_VALUE )
cipher_debug_mode = 1;
if( opt.debug & DBG_IOBUF_VALUE )
iobuf_debug_mode = 1;
}
static void
set_cmd( enum cmd_values *ret_cmd, enum cmd_values new_cmd )
{
enum cmd_values cmd = *ret_cmd;
if( !cmd || cmd == new_cmd )
cmd = new_cmd;
else if( cmd == aSign && new_cmd == aEncr )
cmd = aSignEncr;
else if( cmd == aEncr && new_cmd == aSign )
cmd = aSignEncr;
else if( cmd == aKMode && new_cmd == aSym )
cmd = aKModeC;
else if( ( cmd == aSign && new_cmd == aClearsign )
|| ( cmd == aClearsign && new_cmd == aSign ) )
cmd = aClearsign;
else {
log_error(_("conflicting commands\n"));
g10_exit(2);
}
*ret_cmd = cmd;
}
static void
check_opts(void)
{
if( !opt.def_cipher_algo || check_cipher_algo(opt.def_cipher_algo) )
log_error(_("selected cipher algorithm is invalid\n"));
if( !opt.def_pubkey_algo || check_pubkey_algo(opt.def_pubkey_algo) )
log_error(_("selected pubkey algorithm is invalid\n"));
if( !opt.def_digest_algo || check_digest_algo(opt.def_digest_algo) )
log_error(_("selected digest algorithm is invalid\n"));
if( opt.completes_needed < 1 )
log_error(_("completes-needed must be greater than 0\n"));
if( opt.marginals_needed < 2 )
log_error(_("marginals-needed must be greater than 1\n"));
}
void
main( int argc, char **argv )
{
ARGPARSE_ARGS pargs;
IOBUF a;
int rc=0;
int orig_argc;
char **orig_argv;
const char *fname, *fname_print;
STRLIST sl, remusr= NULL, locusr=NULL;
int nrings=0, sec_nrings=0;
armor_filter_context_t afx;
int detached_sig = 0;
FILE *configfp = NULL;
char *configname = NULL;
unsigned configlineno;
int parse_debug = 0;
int default_config =1;
int errors=0;
int default_keyring = 1;
int greeting = 1;
enum cmd_values cmd = 0;
const char *trustdb_name = NULL;
/* Please note that we may running SUID(ROOT), so be very CAREFUL
* when adding any stuff between here and the call to
* secmem_init() somewhere after the option parsing
*/
log_set_name("gpg");
i18n_init();
opt.compress = -1; /* defaults to standard compress level */
opt.def_cipher_algo = CIPHER_ALGO_BLOWFISH;
opt.def_pubkey_algo = PUBKEY_ALGO_ELGAMAL;
opt.def_digest_algo = DIGEST_ALGO_RMD160;
opt.completes_needed = 1;
opt.marginals_needed = 3;
opt.homedir = "~/.gnupg";
/* check wether we have a config file on the commandline */
orig_argc = argc;
orig_argv = argv;
pargs.argc = &argc;
pargs.argv = &argv;
pargs.flags= 1; /* do not remove the args */
while( arg_parse( &pargs, opts) ) {
if( pargs.r_opt == 510 || pargs.r_opt == 511 )
parse_debug++;
else if( pargs.r_opt == 518 ) {
/* yes there is one, so we do not try the default one, but
* read the option file when it is encountered at the commandline
*/
default_config = 0;
}
else if( pargs.r_opt == 543 )
default_config = 0; /* --no-options */
else if( pargs.r_opt == 544 )
opt.homedir = pargs.r.ret_str;
}
if( default_config )
configname = make_filename(opt.homedir, "options", NULL );
argc = orig_argc;
argv = orig_argv;
pargs.argc = &argc;
pargs.argv = &argv;
pargs.flags= 1; /* do not remove the args */
next_pass:
if( configname ) {
configlineno = 0;
configfp = fopen( configname, "r" );
if( !configfp ) {
if( default_config ) {
if( parse_debug )
log_info(_("note: no default option file '%s'\n"),
configname );
}
else {
log_error(_("option file '%s': %s\n"),
configname, strerror(errno) );
g10_exit(1);
}
m_free(configname); configname = NULL;
}
if( parse_debug && configname )
log_info(_("reading options from '%s'\n"), configname );
default_config = 0;
}
while( optfile_parse( configfp, configname, &configlineno,
&pargs, opts) ) {
switch( pargs.r_opt ) {
case 'v': opt.verbose++; opt.list_sigs=1; break;
case 'z': opt.compress = pargs.r.ret_int; break;
case 'a': opt.armor = 1; opt.no_armor=0; break;
case 'd': break; /* it is default */
case 'c': set_cmd( &cmd , aSym); break;
case 'o': opt.outfile = pargs.r.ret_str; break;
case 'e': set_cmd( &cmd, aEncr); break;
case 'b': detached_sig = 1; /* fall trough */
case 's': set_cmd( &cmd, aSign ); break;
case 't': set_cmd( &cmd , aClearsign); break;
case 'u': /* store the local users */
sl = m_alloc( sizeof *sl + strlen(pargs.r.ret_str));
strcpy(sl->d, pargs.r.ret_str);
sl->next = locusr;
locusr = sl;
break;
case 'r': /* store the remote users */
sl = m_alloc( sizeof *sl + strlen(pargs.r.ret_str));
strcpy(sl->d, pargs.r.ret_str);
sl->next = remusr;
remusr = sl;
break;
case 'k': set_cmd( &cmd, aKMode ); break;
case 500: opt.batch = 1; greeting = 0; break;
case 501: opt.answer_yes = 1; break;
case 502: opt.answer_no = 1; break;
case 503: set_cmd( &cmd, aKeygen); break;
case 506: set_cmd( &cmd, aSignKey); break;
case 507: set_cmd( &cmd, aStore); break;
case 508: set_cmd( &cmd, aCheckKeys);
opt.check_sigs = 1; opt.list_sigs = 1; break;
case 509: add_keyring(pargs.r.ret_str); nrings++; break;
case 510: opt.debug |= pargs.r.ret_ulong; break;
case 511: opt.debug = ~0; break;
case 512: set_status_fd( pargs.r.ret_int ); break;
case 515: opt.fingerprint = 1; break;
case 517: add_secret_keyring(pargs.r.ret_str); sec_nrings++; break;
case 518:
/* config files may not be nested (silently ignore them) */
if( !configfp ) {
m_free(configname);
configname = m_strdup(pargs.r.ret_str);
goto next_pass;
}
break;
case 519: opt.no_armor=1; opt.armor=0; break;
case 520: default_keyring = 0; break;
case 521: set_cmd( &cmd, aListPackets); break;
case 522: greeting = 0; break;
case 523: set_passphrase_fd( pargs.r.ret_int ); break;
case 524: set_cmd( &cmd, aEditSig); break;
case 525: set_cmd( &cmd, aChangePass); break;
case 526: opt.verbose = 0; opt.list_sigs=0; break;
case 527:
opt.def_cipher_algo = string_to_cipher_algo(pargs.r.ret_str);
break;
case 528:
opt.def_pubkey_algo = string_to_pubkey_algo(pargs.r.ret_str);
break;
case 529:
opt.def_digest_algo = string_to_digest_algo(pargs.r.ret_str);
break;
case 530: set_cmd( &cmd, aImport); break;
case 532: quick_random_gen(1); break;
case 534: opt.no_comment=1; break;
case 535: opt.completes_needed = pargs.r.ret_int; break;
case 536: opt.marginals_needed = pargs.r.ret_int; break;
case 537: set_cmd( &cmd, aExport); break;
case 538: trustdb_name = pargs.r.ret_str; break;
case 539: set_cmd( &cmd, aClearsign); break;
case 540: secmem_set_flags( secmem_get_flags() | 1 ); break;
case 541: set_cmd( &cmd, aNOP); break;
case 542: set_cmd( &cmd, aGenRevoke); break;
case 543: break; /* no-options */
case 544: opt.homedir = pargs.r.ret_str; break;
case 545: opt.batch = 0; break;
default : errors++; pargs.err = configfp? 1:2; break;
}
}
if( configfp ) {
fclose( configfp );
configfp = NULL;
m_free(configname); configname = NULL;
goto next_pass;
}
m_free( configname ); configname = NULL;
check_opts();
if( log_get_errorcount(0) )
g10_exit(2);
if( greeting ) {
tty_printf("%s %s; %s\n", strusage(11), strusage(13), strusage(14) );
tty_printf("%s\n", strusage(15) );
}
/* initialize the secure memory. */
secmem_init( 16384 );
/* Okay, we are now working under our real uid */
write_status( STATUS_ENTER );
set_debug();
if( cmd == aKMode || cmd == aKModeC ) { /* kludge to be compatible to pgp */
if( cmd == aKModeC ) {
opt.fingerprint = 1;
cmd = aKMode;
}
opt.list_sigs = 0;
if( opt.verbose > 2 )
opt.check_sigs++;
if( opt.verbose > 1 )
opt.list_sigs++;
opt.verbose = opt.verbose > 1;
}
if( opt.verbose > 1 )
set_packet_list_mode(1);
if( !sec_nrings || default_keyring ) /* add default secret rings */
add_secret_keyring("secring.gpg");
if( !nrings || default_keyring ) /* add default ring */
add_keyring("pubring.gpg");
if( argc ) {
fname_print = fname = *argv;
}
else {
fname_print = "[stdin]";
fname = NULL;
if( get_passphrase_fd() == 0 ) {
/* reading data and passphrase form stdin:
* we assume the first line is the passphrase, so
* we read it now
*/
/* FIXME: doit */
}
}
rc = init_trustdb(1, trustdb_name );
if( rc )
log_error(_("failed to initialize the TrustDB: %s\n"), g10_errstr(rc));
switch( cmd ) {
case aStore: /* only store the file */
if( argc > 1 )
wrong_args(_("--store [filename]"));
if( (rc = encode_store(fname)) )
log_error("%s: store failed: %s\n",
fname_print, g10_errstr(rc) );
break;
case aSym: /* encrypt the given file only with the symmetric cipher */
if( argc > 1 )
wrong_args(_("--symmetric [filename]"));
if( (rc = encode_symmetric(fname)) )
log_error("%s: symmetric encryption failed: %s\n", fname_print, g10_errstr(rc) );
break;
case aEncr: /* encrypt the given file */
if( argc > 1 )
wrong_args(_("--encrypt [filename]"));
if( (rc = encode_crypt(fname,remusr)) )
log_error("%s: encryption failed: %s\n", fname_print, g10_errstr(rc) );
break;
case aSign: /* sign the given file */
sl = NULL;
if( detached_sig ) { /* sign all files */
for( ; argc; argc--, argv++ )
add_to_strlist( &sl, *argv );
}
else {
if( argc > 1 )
wrong_args(_("--sign [filename]"));
if( argc ) {
sl = m_alloc_clear( sizeof *sl + strlen(fname));
strcpy(sl->d, fname);
}
}
if( (rc = sign_file( sl, detached_sig, locusr, 0, NULL, NULL)) )
log_error("signing failed: %s\n", g10_errstr(rc) );
free_strlist(sl);
break;
case aSignEncr: /* sign and encrypt the given file */
if( argc > 1 )
wrong_args(_("--sign --encrypt [filename]"));
if( argc ) {
sl = m_alloc_clear( sizeof *sl + strlen(fname));
strcpy(sl->d, fname);
}
else
sl = NULL;
if( (rc = sign_file(sl, detached_sig, locusr, 1, remusr, NULL)) )
log_error("%s: sign+encrypt failed: %s\n", fname_print, g10_errstr(rc) );
free_strlist(sl);
break;
case aClearsign: /* make a clearsig */
if( argc > 1 )
wrong_args(_("--clearsign [filename]"));
if( (rc = clearsign_file(fname, locusr, NULL)) )
log_error("%s: clearsign failed: %s\n", fname_print, g10_errstr(rc) );
break;
case aSignKey: /* sign the key given as argument */
if( argc != 1 )
wrong_args(_("--sign-key username"));
/* note: fname is the user id! */
if( (rc = sign_key(fname, locusr)) )
log_error("%s: sign key failed: %s\n", fname_print, g10_errstr(rc) );
break;
case aEditSig: /* Edit a key signature */
if( argc != 1 )
wrong_args(_("--edit-sig username"));
/* note: fname is the user id! */
if( (rc = edit_keysigs(fname)) )
log_error("%s: edit signature failed: %s\n", fname_print, g10_errstr(rc) );
break;
case aChangePass: /* Chnage the passphrase */
if( argc > 1 ) /* no arg: use default, 1 arg use this one */
wrong_args(_("--change-passphrase [username]"));
/* note: fname is the user id! */
if( (rc = change_passphrase(fname)) )
log_error("%s: change passphrase failed: %s\n", fname_print,
g10_errstr(rc) );
break;
case aCheckKeys:
case aKMode: /* list keyring */
if( !argc ) { /* list the default public keyrings */
int i, seq=0;
const char *s;
while( (s=get_keyring(seq++)) ) {
if( !(a = iobuf_open(s)) ) {
log_error(_("can't open '%s'\n"), s);
continue;
}
if( seq > 1 )
putchar('\n');
printf("%s\n", s );
for(i=strlen(s); i; i-- )
putchar('-');
putchar('\n');
proc_packets( a );
iobuf_close(a);
}
}
else if( cmd == aCheckKeys ) {
log_error("will be soon: --check-keys user-ids\n");
}
else if( argc == 1) { /* list the given keyring */
if( !(a = iobuf_open(fname)) )
log_error(_("can't open '%s'\n"), fname_print);
else {
if( !opt.no_armor ) {
memset( &afx, 0, sizeof afx);
iobuf_push_filter( a, armor_filter, &afx );
}
proc_packets( a );
iobuf_close(a);
}
}
else
wrong_args(_("-k[v][v][v][c] [keyring]") );
break;
case aKeygen: /* generate a key (interactive) */
if( argc )
wrong_args(_("--gen-key"));
generate_keypair();
break;
case aImport:
if( !argc ) {
rc = import_pubkeys( NULL );
if( rc )
log_error("import failed: %s\n", g10_errstr(rc) );
}
for( ; argc; argc--, argv++ ) {
rc = import_pubkeys( *argv );
if( rc )
log_error("import from '%s' failed: %s\n",
*argv, g10_errstr(rc) );
}
break;
case aExport:
sl = NULL;
for( ; argc; argc--, argv++ )
add_to_strlist( &sl, *argv );
export_pubkeys( sl );
free_strlist(sl);
break;
case aGenRevoke:
if( argc != 1 )
wrong_args("--gen-revoke user-id");
gen_revoke( *argv );
break;
case aNOP:
break;
case aListPackets:
opt.list_packets=1;
default:
if( argc > 1 )
wrong_args(_("[filename]"));
if( !(a = iobuf_open(fname)) )
log_error(_("can't open '%s'\n"), fname_print);
else {
if( !opt.no_armor ) {
if( use_armor_filter( a ) ) {
memset( &afx, 0, sizeof afx);
iobuf_push_filter( a, armor_filter, &afx );
}
}
if( cmd == aListPackets ) {
set_packet_list_mode(1);
opt.list_packets=1;
}
proc_packets( a );
iobuf_close(a);
}
break;
}
/* cleanup */
FREE_STRLIST(remusr);
FREE_STRLIST(locusr);
g10_exit(0);
}
void
g10_exit( int rc )
{
if( opt.debug )
secmem_dump_stats();
secmem_term();
rc = rc? rc : log_get_errorcount(0)? 2:0;
write_status( STATUS_LEAVE );
exit(rc );
}
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