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git://git.gnupg.org/gnupg.git
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639 lines
16 KiB
C
639 lines
16 KiB
C
/* scdaemon.c - The GnuPG Smartcard Daemon
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* Copyright (C) 2001, 2002 Free Software Foundation, Inc.
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*
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* This file is part of GnuPG.
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*
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* GnuPG is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* GnuPG is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
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*/
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#include <config.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <stddef.h>
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#include <stdarg.h>
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#include <string.h>
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#include <errno.h>
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#include <assert.h>
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#include <time.h>
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#include <fcntl.h>
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#include <sys/socket.h>
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#include <sys/un.h>
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#include <unistd.h>
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#include <signal.h>
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#define JNLIB_NEED_LOG_LOGV
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#include "scdaemon.h"
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#include <ksba.h>
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#include <gcrypt.h>
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#include <assuan.h> /* malloc hooks */
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#include "i18n.h"
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#include "sysutils.h"
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enum cmd_and_opt_values
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{ aNull = 0,
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oCsh = 'c',
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oQuiet = 'q',
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oSh = 's',
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oVerbose = 'v',
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oNoVerbose = 500,
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oOptions,
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oDebug,
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oDebugAll,
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oDebugWait,
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oDebugSC,
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oNoGreeting,
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oNoOptions,
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oHomedir,
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oNoDetach,
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oNoGrab,
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oLogFile,
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oServer,
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oDaemon,
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oBatch,
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oReaderPort,
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aTest };
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static ARGPARSE_OPTS opts[] = {
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{ 301, NULL, 0, N_("@Options:\n ") },
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{ oServer, "server", 0, N_("run in server mode (foreground)") },
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{ oDaemon, "daemon", 0, N_("run in daemon mode (background)") },
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{ oVerbose, "verbose", 0, N_("verbose") },
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{ oQuiet, "quiet", 0, N_("be somewhat more quiet") },
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{ oSh, "sh", 0, N_("sh-style command output") },
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{ oCsh, "csh", 0, N_("csh-style command output") },
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{ oOptions, "options" , 2, N_("read options from file")},
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{ oDebug, "debug" ,4|16, N_("set debugging flags")},
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{ oDebugAll, "debug-all" ,0, N_("enable full debugging")},
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{ oDebugWait,"debug-wait",1, "@"},
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{ oDebugSC, "debug-sc", 1, N_("|N|set OpenSC debug level to N")},
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{ oNoDetach, "no-detach" ,0, N_("do not detach from the console")},
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{ oLogFile, "log-file" ,2, N_("use a log file for the server")},
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{ oReaderPort, "reader-port", 1, N_("|N|connect to reader at port N")},
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{0}
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};
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static volatile int caught_fatal_sig = 0;
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/* It is possible that we are currently running under setuid permissions */
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static int maybe_setuid = 1;
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/* Name of the communication socket */
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static char socket_name[128];
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static const char *
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my_strusage (int level)
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{
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const char *p;
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switch (level)
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{
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case 11: p = "scdaemon (GnuPG)";
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break;
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case 13: p = VERSION; break;
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case 17: p = PRINTABLE_OS_NAME; break;
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case 19: p = _("Please report bugs to <" PACKAGE_BUGREPORT ">.\n");
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break;
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case 1:
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case 40: p = _("Usage: scdaemon [options] (-h for help)");
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break;
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case 41: p = _("Syntax: scdaemon [options] [command [args]]\n"
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"Smartcard daemon for GnuPG\n");
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break;
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default: p = NULL;
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}
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return p;
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}
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static void
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i18n_init (void)
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{
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#ifdef USE_SIMPLE_GETTEXT
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set_gettext_file( PACKAGE );
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#else
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#ifdef ENABLE_NLS
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setlocale (LC_ALL, "");
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bindtextdomain (PACKAGE, LOCALEDIR);
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textdomain (PACKAGE);
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#endif
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#endif
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}
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/* Used by gcry for logging */
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static void
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my_gcry_logger (void *dummy, int level, const char *fmt, va_list arg_ptr)
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{
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/* translate the log levels */
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switch (level)
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{
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case GCRY_LOG_CONT: level = JNLIB_LOG_CONT; break;
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case GCRY_LOG_INFO: level = JNLIB_LOG_INFO; break;
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case GCRY_LOG_WARN: level = JNLIB_LOG_WARN; break;
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case GCRY_LOG_ERROR:level = JNLIB_LOG_ERROR; break;
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case GCRY_LOG_FATAL:level = JNLIB_LOG_FATAL; break;
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case GCRY_LOG_BUG: level = JNLIB_LOG_BUG; break;
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case GCRY_LOG_DEBUG:level = JNLIB_LOG_DEBUG; break;
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default: level = JNLIB_LOG_ERROR; break;
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}
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log_logv (level, fmt, arg_ptr);
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}
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static void
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cleanup (void)
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{
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if (*socket_name)
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{
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char *p;
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remove (socket_name);
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p = strrchr (socket_name, '/');
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if (p)
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{
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*p = 0;
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rmdir (socket_name);
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*p = '/';
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}
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*socket_name = 0;
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}
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}
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static RETSIGTYPE
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cleanup_sh (int sig)
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{
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if (caught_fatal_sig)
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raise (sig);
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caught_fatal_sig = 1;
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/* gcry_control( GCRYCTL_TERM_SECMEM );*/
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cleanup ();
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#ifndef HAVE_DOSISH_SYSTEM
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{ /* reset action to default action and raise signal again */
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struct sigaction nact;
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nact.sa_handler = SIG_DFL;
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sigemptyset( &nact.sa_mask );
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nact.sa_flags = 0;
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sigaction( sig, &nact, NULL);
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}
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#endif
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raise( sig );
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}
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int
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main (int argc, char **argv )
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{
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ARGPARSE_ARGS pargs;
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int orig_argc;
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int may_coredump;
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char **orig_argv;
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FILE *configfp = NULL;
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char *configname = NULL;
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const char *shell;
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unsigned configlineno;
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int parse_debug = 0;
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int default_config =1;
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int greeting = 0;
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int nogreeting = 0;
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int pipe_server = 0;
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int is_daemon = 0;
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int nodetach = 0;
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int csh_style = 0;
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char *logfile = NULL;
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int debug_wait = 0;
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int reader_port = 32768; /* First USB reader. */
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set_strusage (my_strusage);
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gcry_control (GCRYCTL_SUSPEND_SECMEM_WARN);
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/* Please note that we may running SUID(ROOT), so be very CAREFUL
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when adding any stuff between here and the call to INIT_SECMEM()
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somewhere after the option parsing */
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log_set_prefix ("scdaemon", 1|4);
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i18n_init ();
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/* check that the libraries are suitable. Do it here because
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the option parsing may need services of the library */
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if (!gcry_check_version (NEED_LIBGCRYPT_VERSION) )
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{
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log_fatal( _("libgcrypt is too old (need %s, have %s)\n"),
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NEED_LIBGCRYPT_VERSION, gcry_check_version (NULL) );
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}
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ksba_set_malloc_hooks (gcry_malloc, gcry_realloc, gcry_free);
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assuan_set_malloc_hooks (gcry_malloc, gcry_realloc, gcry_free);
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gcry_set_log_handler (my_gcry_logger, NULL);
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gcry_control (GCRYCTL_USE_SECURE_RNDPOOL);
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may_coredump = disable_core_dumps ();
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shell = getenv ("SHELL");
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if (shell && strlen (shell) >= 3 && !strcmp (shell+strlen (shell)-3, "csh") )
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csh_style = 1;
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/* FIXME: Using this homedir option does only make sense when not
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running as a system service. We might want to check for this by
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looking at the uid or ebtter use an explict option for this */
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opt.homedir = getenv("GNUPGHOME");
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if (!opt.homedir || !*opt.homedir)
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opt.homedir = GNUPG_DEFAULT_HOMEDIR;
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/* check whether we have a config file on the commandline */
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orig_argc = argc;
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orig_argv = argv;
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pargs.argc = &argc;
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pargs.argv = &argv;
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pargs.flags= 1|(1<<6); /* do not remove the args, ignore version */
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while (arg_parse( &pargs, opts))
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{
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if (pargs.r_opt == oDebug || pargs.r_opt == oDebugAll)
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parse_debug++;
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else if (pargs.r_opt == oOptions)
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{ /* yes there is one, so we do not try the default one, but
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read the option file when it is encountered at the
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commandline */
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default_config = 0;
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}
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else if (pargs.r_opt == oNoOptions)
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default_config = 0; /* --no-options */
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else if (pargs.r_opt == oHomedir)
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opt.homedir = pargs.r.ret_str;
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}
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/* initialize the secure memory. */
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gcry_control (GCRYCTL_INIT_SECMEM, 16384, 0);
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maybe_setuid = 0;
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/*
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Now we are working under our real uid
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*/
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if (default_config)
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configname = make_filename (opt.homedir, "scdaemon.conf", NULL );
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argc = orig_argc;
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argv = orig_argv;
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pargs.argc = &argc;
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pargs.argv = &argv;
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pargs.flags= 1; /* do not remove the args */
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next_pass:
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if (configname)
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{
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configlineno = 0;
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configfp = fopen (configname, "r");
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if (!configfp)
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{
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if (default_config)
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{
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if( parse_debug )
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log_info (_("NOTE: no default option file `%s'\n"),
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configname );
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}
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else
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{
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log_error (_("option file `%s': %s\n"),
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configname, strerror(errno) );
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exit(2);
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}
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xfree (configname);
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configname = NULL;
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}
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if (parse_debug && configname )
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log_info (_("reading options from `%s'\n"), configname );
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default_config = 0;
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}
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while (optfile_parse( configfp, configname, &configlineno, &pargs, opts) )
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{
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switch (pargs.r_opt)
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{
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case oQuiet: opt.quiet = 1; break;
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case oVerbose: opt.verbose++; break;
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case oBatch: opt.batch=1; break;
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case oDebug: opt.debug |= pargs.r.ret_ulong; break;
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case oDebugAll: opt.debug = ~0; break;
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case oDebugWait: debug_wait = pargs.r.ret_int; break;
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case oDebugSC: opt.debug_sc = pargs.r.ret_int; break;
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case oOptions:
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/* config files may not be nested (silently ignore them) */
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if (!configfp)
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{
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xfree(configname);
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configname = xstrdup(pargs.r.ret_str);
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goto next_pass;
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}
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break;
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case oNoGreeting: nogreeting = 1; break;
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case oNoVerbose: opt.verbose = 0; break;
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case oNoOptions: break; /* no-options */
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case oHomedir: opt.homedir = pargs.r.ret_str; break;
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case oNoDetach: nodetach = 1; break;
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case oLogFile: logfile = pargs.r.ret_str; break;
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case oCsh: csh_style = 1; break;
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case oSh: csh_style = 0; break;
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case oServer: pipe_server = 1; break;
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case oDaemon: is_daemon = 1; break;
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case oReaderPort: reader_port = pargs.r.ret_int; break;
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default : pargs.err = configfp? 1:2; break;
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}
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}
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if (configfp)
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{
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fclose( configfp );
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configfp = NULL;
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xfree(configname);
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configname = NULL;
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goto next_pass;
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}
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xfree (configname);
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configname = NULL;
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if (log_get_errorcount(0))
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exit(2);
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if (nogreeting )
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greeting = 0;
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if (greeting)
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{
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fprintf (stderr, "%s %s; %s\n",
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strusage(11), strusage(13), strusage(14) );
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fprintf (stderr, "%s\n", strusage(15) );
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}
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#ifdef IS_DEVELOPMENT_VERSION
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log_info ("NOTE: this is a development version!\n");
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#endif
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if (atexit (cleanup))
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{
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log_error ("atexit failed\n");
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cleanup ();
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exit (1);
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}
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if (debug_wait && pipe_server)
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{
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log_debug ("waiting for debugger - my pid is %u .....\n",
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(unsigned int)getpid());
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sleep (debug_wait);
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log_debug ("... okay\n");
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}
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/* now start with logging to a file if this is desired */
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if (logfile)
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{
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log_set_file (logfile);
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log_set_prefix (NULL, 1|2|4);
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}
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if (pipe_server)
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{ /* this is the simple pipe based server */
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scd_command_handler (-1);
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}
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else if (!is_daemon)
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{
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log_info (_("please use the option `--daemon'"
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" to run the program in the background\n"));
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}
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else
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{ /* regular server mode */
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int fd;
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pid_t pid;
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int i;
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int len;
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struct sockaddr_un serv_addr;
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char *p;
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/* fixme: if there is already a running gpg-agent we should
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share the same directory - and vice versa */
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*socket_name = 0;
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snprintf (socket_name, DIM(socket_name)-1,
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"/tmp/gpg-XXXXXX/S.scdaemon");
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socket_name[DIM(socket_name)-1] = 0;
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p = strrchr (socket_name, '/');
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if (!p)
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BUG ();
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*p = 0;;
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if (!mkdtemp(socket_name))
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{
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log_error ("can't create directory `%s': %s\n",
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socket_name, strerror(errno) );
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exit (1);
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}
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*p = '/';
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if (strchr (socket_name, ':') )
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{
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log_error ("colons are not allowed in the socket name\n");
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exit (1);
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}
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if (strlen (socket_name)+1 >= sizeof serv_addr.sun_path )
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{
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log_error ("name of socket to long\n");
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exit (1);
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}
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fd = socket (AF_UNIX, SOCK_STREAM, 0);
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if (fd == -1)
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{
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log_error ("can't create socket: %s\n", strerror(errno) );
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exit (1);
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}
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memset (&serv_addr, 0, sizeof serv_addr);
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serv_addr.sun_family = AF_UNIX;
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strcpy (serv_addr.sun_path, socket_name);
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len = (offsetof (struct sockaddr_un, sun_path)
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+ strlen(serv_addr.sun_path) + 1);
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if (bind (fd, (struct sockaddr*)&serv_addr, len) == -1)
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{
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log_error ("error binding socket to `%s': %s\n",
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serv_addr.sun_path, strerror (errno) );
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close (fd);
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exit (1);
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}
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if (listen (fd, 5 ) == -1)
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{
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log_error ("listen() failed: %s\n", strerror (errno));
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close (fd);
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exit (1);
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}
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if (opt.verbose)
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log_info ("listening on socket `%s'\n", socket_name );
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fflush (NULL);
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pid = fork ();
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if (pid == (pid_t)-1)
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{
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log_fatal ("fork failed: %s\n", strerror (errno) );
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exit (1);
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}
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else if (pid)
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{ /* we are the parent */
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char *infostr;
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close (fd);
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/* create the info string: <name>:<pid>:<protocol_version> */
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if (asprintf (&infostr, "SCDAEMON_INFO=%s:%lu:1",
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socket_name, (ulong)pid ) < 0)
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{
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log_error ("out of core\n");
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kill (pid, SIGTERM);
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exit (1);
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}
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*socket_name = 0; /* don't let cleanup() remove the socket -
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the child should do this from now on */
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if (argc)
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{ /* run the program given on the commandline */
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if (putenv (infostr))
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{
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log_error ("failed to set environment: %s\n",
|
|
strerror (errno) );
|
|
kill (pid, SIGTERM );
|
|
exit (1);
|
|
}
|
|
execvp (argv[0], argv);
|
|
log_error ("failed to run the command: %s\n", strerror (errno));
|
|
kill (pid, SIGTERM);
|
|
exit (1);
|
|
}
|
|
else
|
|
{
|
|
/* print the environment string, so that the caller can use
|
|
shell's eval to set it */
|
|
if (csh_style)
|
|
{
|
|
*strchr (infostr, '=') = ' ';
|
|
printf ( "setenv %s\n", infostr);
|
|
}
|
|
else
|
|
{
|
|
printf ( "%s; export SCDAEMON_INFO;\n", infostr);
|
|
}
|
|
free (infostr);
|
|
exit (0);
|
|
}
|
|
/* NOTREACHED */
|
|
} /* end parent */
|
|
|
|
/* this is the child */
|
|
|
|
/* detach from tty and put process into a new session */
|
|
if (!nodetach )
|
|
{ /* close stdin, stdout and stderr unless it is the log stream */
|
|
for (i=0; i <= 2; i++)
|
|
{
|
|
if ( log_get_fd () != i)
|
|
close (i);
|
|
}
|
|
if (setsid() == -1)
|
|
{
|
|
log_error ("setsid() failed: %s\n", strerror(errno) );
|
|
cleanup ();
|
|
exit (1);
|
|
}
|
|
}
|
|
|
|
/* setup signals */
|
|
{
|
|
struct sigaction oact, nact;
|
|
|
|
nact.sa_handler = cleanup_sh;
|
|
sigemptyset (&nact.sa_mask);
|
|
nact.sa_flags = 0;
|
|
|
|
sigaction (SIGHUP, NULL, &oact);
|
|
if (oact.sa_handler != SIG_IGN)
|
|
sigaction (SIGHUP, &nact, NULL);
|
|
sigaction( SIGTERM, NULL, &oact );
|
|
if (oact.sa_handler != SIG_IGN)
|
|
sigaction (SIGTERM, &nact, NULL);
|
|
nact.sa_handler = SIG_IGN;
|
|
sigaction (SIGPIPE, &nact, NULL);
|
|
sigaction (SIGINT, &nact, NULL);
|
|
}
|
|
|
|
if (chdir("/"))
|
|
{
|
|
log_error ("chdir to / failed: %s\n", strerror (errno));
|
|
exit (1);
|
|
}
|
|
|
|
scd_command_handler (fd);
|
|
|
|
close (fd);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
void
|
|
scd_exit (int rc)
|
|
{
|
|
#if 0
|
|
#warning no update_random_seed_file
|
|
update_random_seed_file();
|
|
#endif
|
|
#if 0
|
|
/* at this time a bit annoying */
|
|
if (opt.debug & DBG_MEMSTAT_VALUE)
|
|
{
|
|
gcry_control( GCRYCTL_DUMP_MEMORY_STATS );
|
|
gcry_control( GCRYCTL_DUMP_RANDOM_STATS );
|
|
}
|
|
if (opt.debug)
|
|
gcry_control (GCRYCTL_DUMP_SECMEM_STATS );
|
|
#endif
|
|
gcry_control (GCRYCTL_TERM_SECMEM );
|
|
rc = rc? rc : log_get_errorcount(0)? 2 : 0;
|
|
exit (rc);
|
|
}
|
|
|
|
|
|
void
|
|
scd_init_default_ctrl (CTRL ctrl)
|
|
{
|
|
|
|
}
|
|
|