mirror of
https://github.com/osmarks/ngircd.git
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startup: fork only once, never run with uid 0.
This commit is contained in:
Florian Westphal
parent
94dd7fa7d6
commit
bc2dac3c74
@ -12,7 +12,7 @@
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#include "portab.h"
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static char UNUSED id[] = "$Id: ngircd.c,v 1.96 2005/06/01 21:52:18 alex Exp $";
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static char UNUSED id[] = "$Id: ngircd.c,v 1.97 2005/06/17 18:22:45 fw Exp $";
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/**
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* @file
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@ -69,6 +69,7 @@ LOCAL void Fill_Version PARAMS(( void ));
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LOCAL void Setup_FDStreams PARAMS(( void ));
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LOCAL bool NGIRCd_Init PARAMS(( bool ));
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/**
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* The main() function of ngIRCd.
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@ -81,10 +82,7 @@ LOCAL void Setup_FDStreams PARAMS(( void ));
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GLOBAL int
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main( int argc, const char *argv[] )
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{
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struct passwd *pwd;
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struct group *grp;
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bool ok, configtest = false;
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long pid;
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int i;
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size_t n;
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@ -263,74 +261,9 @@ main( int argc, const char *argv[] )
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Log_Init( );
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Conf_Init( );
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if( Conf_Chroot[0] )
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{
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/* Chroot */
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if( chdir( Conf_Chroot ) != 0 ) Log( LOG_ERR, "Can't chdir() in ChrootDir (%s): %s", Conf_Chroot, strerror( errno ));
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if( chroot( Conf_Chroot ) != 0 ) Log( LOG_ERR, "Can't change root directory to \"%s\": %s", Conf_Chroot, strerror( errno ));
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else Log( LOG_INFO, "Changed root and working directory to \"%s\".", Conf_Chroot );
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}
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if( Conf_GID != 0 )
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{
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/* Set new group ID */
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if( setgid( Conf_GID ) != 0 ) Log( LOG_ERR, "Can't change group ID to %u: %s", Conf_GID, strerror( errno ));
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}
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if( Conf_UID != 0 )
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{
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/* Set new user ID */
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if( setuid( Conf_UID ) != 0 ) Log( LOG_ERR, "Can't change user ID to %u: %s", Conf_UID, strerror( errno ));
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}
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/* Normally a child process is forked which isn't any longer
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* connected to ther controlling terminal. Use "--nodaemon"
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* to disable this "daemon mode" (useful for debugging). */
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if( ! NGIRCd_NoDaemon )
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{
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/* fork child process */
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pid = (long)fork( );
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if( pid > 0 )
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{
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/* "Old" process: exit. */
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exit( 0 );
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}
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if( pid < 0 )
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{
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/* Error!? */
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fprintf( stderr, "%s: Can't fork: %s!\nFatal error, exiting now ...\n", PACKAGE_NAME, strerror( errno ));
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exit( 1 );
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}
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/* New child process */
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(void)setsid( );
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chdir( "/" );
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/* Detach stdin, stdout and stderr */
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Setup_FDStreams( );
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}
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/* Create PID file */
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pid = (long) getpid( );
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Pidfile_Create( pid );
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/* Show user, group, and PID of the running daemon */
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pwd = getpwuid( getuid( )); grp = getgrgid( getgid( ));
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Log( LOG_INFO, "Running as user %s(%ld), group %s(%ld), with PID %ld.", pwd ? pwd->pw_name : "unknown", (long)getuid( ), grp ? grp->gr_name : "unknown", (long)getgid( ), pid);
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/* Change working directory to home directory of the user
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* we are running as (when not running chroot()'ed!) */
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if( Conf_UID != 0 && ! Conf_Chroot[0] )
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{
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struct passwd *pwd;
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pwd = getpwuid( Conf_UID );
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if( pwd != NULL )
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{
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if( chdir( pwd->pw_dir ) == 0 ) Log( LOG_DEBUG, "Changed working directory to \"%s\" ...", pwd->pw_dir );
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else Log( LOG_ERR, "Can't change working directory to \"%s\": %s", pwd->pw_dir, strerror( errno ));
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}
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else Log( LOG_ERR, "Can't get user informaton for UID %d!?", Conf_UID );
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if (!NGIRCd_Init( NGIRCd_NoDaemon )) {
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Log(LOG_WARNING, "Fatal: Initialization failed");
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exit(1);
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}
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/* Initialize modules, part II: these functions are eventually
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@ -357,17 +290,17 @@ main( int argc, const char *argv[] )
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* beim PASS-Befehl verwendete Syntax sowie die erweiterten Flags
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* sind in doc/Protocol.txt beschrieben. */
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#ifdef IRCPLUS
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sprintf( NGIRCd_ProtoID, "%s%s %s|%s:%s", PROTOVER, PROTOIRCPLUS, PACKAGE_NAME, PACKAGE_VERSION, IRCPLUSFLAGS );
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snprintf( NGIRCd_ProtoID, sizeof NGIRCd_ProtoID, "%s%s %s|%s:%s", PROTOVER, PROTOIRCPLUS, PACKAGE_NAME, PACKAGE_VERSION, IRCPLUSFLAGS );
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#ifdef ZLIB
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strcat( NGIRCd_ProtoID, "Z" );
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#endif
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if( Conf_OperCanMode ) strcat( NGIRCd_ProtoID, "o" );
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#else
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sprintf( NGIRCd_ProtoID, "%s%s %s|%s", PROTOVER, PROTOIRC, PACKAGE_NAME, PACKAGE_VERSION );
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snprintf( NGIRCd_ProtoID, sizeof NGIRCd_ProtoID, "%s%s %s|%s", PROTOVER, PROTOIRC, PACKAGE_NAME, PACKAGE_VERSION );
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#endif
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strcat( NGIRCd_ProtoID, " P" );
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strlcat( NGIRCd_ProtoID, " P", sizeof NGIRCd_ProtoID );
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#ifdef ZLIB
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strcat( NGIRCd_ProtoID, "Z" );
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strlcat( NGIRCd_ProtoID, "Z", sizeof NGIRCd_ProtoID );
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#endif
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Log( LOG_DEBUG, "Protocol and server ID is \"%s\".", NGIRCd_ProtoID );
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@ -395,9 +328,8 @@ main( int argc, const char *argv[] )
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Channel_Exit( );
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Lists_Exit( );
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Log_Exit( );
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Pidfile_Delete( );
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}
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Pidfile_Delete( );
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return 0;
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} /* main */
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@ -415,42 +347,60 @@ Fill_Version( void )
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NGIRCd_VersionAddition[0] = '\0';
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#ifdef SYSLOG
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strcpy( NGIRCd_VersionAddition, "SYSLOG" );
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strlcpy( NGIRCd_VersionAddition, "SYSLOG", sizeof NGIRCd_VersionAddition );
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#endif
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#ifdef ZLIB
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if( NGIRCd_VersionAddition[0] ) strcat( NGIRCd_VersionAddition, "+" );
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strcat( NGIRCd_VersionAddition, "ZLIB" );
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if( NGIRCd_VersionAddition[0] )
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strlcat( NGIRCd_VersionAddition, "+", sizeof NGIRCd_VersionAddition );
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strlcat( NGIRCd_VersionAddition, "ZLIB", sizeof NGIRCd_VersionAddition );
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#endif
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#ifdef TCPWRAP
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if( NGIRCd_VersionAddition[0] ) strcat( NGIRCd_VersionAddition, "+" );
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strcat( NGIRCd_VersionAddition, "TCPWRAP" );
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if( NGIRCd_VersionAddition[0] )
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strlcat( NGIRCd_VersionAddition, "+", sizeof NGIRCd_VersionAddition );
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strlcat( NGIRCd_VersionAddition, "TCPWRAP", sizeof NGIRCd_VersionAddition );
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#endif
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#ifdef RENDEZVOUS
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if( NGIRCd_VersionAddition[0] ) strcat( NGIRCd_VersionAddition, "+" );
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strcat( NGIRCd_VersionAddition, "RENDEZVOUS" );
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if( NGIRCd_VersionAddition[0] )
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strlcat( NGIRCd_VersionAddition, "+", sizeof NGIRCd_VersionAddition );
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strlcat( NGIRCd_VersionAddition, "RENDEZVOUS", sizeof NGIRCd_VersionAddition );
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#endif
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#ifdef IDENTAUTH
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if( NGIRCd_VersionAddition[0] ) strcat( NGIRCd_VersionAddition, "+" );
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strcat( NGIRCd_VersionAddition, "IDENT" );
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if( NGIRCd_VersionAddition[0] )
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strlcat( NGIRCd_VersionAddition, "+", sizeof NGIRCd_VersionAddition );
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strlcat( NGIRCd_VersionAddition, "IDENT", sizeof NGIRCd_VersionAddition );
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#endif
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#ifdef DEBUG
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if( NGIRCd_VersionAddition[0] ) strcat( NGIRCd_VersionAddition, "+" );
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strcat( NGIRCd_VersionAddition, "DEBUG" );
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if( NGIRCd_VersionAddition[0] )
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strlcat( NGIRCd_VersionAddition, "+", sizeof NGIRCd_VersionAddition );
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strlcat( NGIRCd_VersionAddition, "DEBUG", sizeof NGIRCd_VersionAddition );
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#endif
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#ifdef SNIFFER
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if( NGIRCd_VersionAddition[0] ) strcat( NGIRCd_VersionAddition, "+" );
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strcat( NGIRCd_VersionAddition, "SNIFFER" );
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if( NGIRCd_VersionAddition[0] )
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strlcat( NGIRCd_VersionAddition, "+", sizeof NGIRCd_VersionAddition );
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strlcat( NGIRCd_VersionAddition, "SNIFFER", sizeof NGIRCd_VersionAddition );
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#endif
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#ifdef STRICT_RFC
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if( NGIRCd_VersionAddition[0] ) strcat( NGIRCd_VersionAddition, "+" );
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strcat( NGIRCd_VersionAddition, "RFC" );
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if( NGIRCd_VersionAddition[0] )
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strlcat( NGIRCd_VersionAddition, "+", sizeof NGIRCd_VersionAddition );
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strlcat( NGIRCd_VersionAddition, "RFC", sizeof NGIRCd_VersionAddition );
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#endif
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#ifdef IRCPLUS
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if( NGIRCd_VersionAddition[0] ) strcat( NGIRCd_VersionAddition, "+" );
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strcat( NGIRCd_VersionAddition, "IRCPLUS" );
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if( NGIRCd_VersionAddition[0] )
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strlcat( NGIRCd_VersionAddition, "+", sizeof NGIRCd_VersionAddition );
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strlcat( NGIRCd_VersionAddition, "IRCPLUS", sizeof NGIRCd_VersionAddition );
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#endif
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if( NGIRCd_VersionAddition[0] ) strlcat( NGIRCd_VersionAddition, "-", sizeof( NGIRCd_VersionAddition ));
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if( NGIRCd_VersionAddition[0] )
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strlcat( NGIRCd_VersionAddition, "-", sizeof( NGIRCd_VersionAddition ));
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strlcat( NGIRCd_VersionAddition, TARGET_CPU, sizeof( NGIRCd_VersionAddition ));
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strlcat( NGIRCd_VersionAddition, "/", sizeof( NGIRCd_VersionAddition ));
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strlcat( NGIRCd_VersionAddition, TARGET_VENDOR, sizeof( NGIRCd_VersionAddition ));
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@ -480,7 +430,7 @@ NGIRCd_Rehash( void )
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Conn_ExitListeners( );
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/* Remember old server name */
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strcpy( old_name, Conf_ServerName );
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strlcpy( old_name, Conf_ServerName, sizeof old_name );
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/* Re-read configuration ... */
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Conf_Rehash( );
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@ -651,7 +601,9 @@ Pidfile_Delete( void )
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LOCAL void
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Pidfile_Create( long pid )
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{
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FILE *pidf;
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int pidfd;
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char pidbuf[64];
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int len;
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/* Pidfile configured? */
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if( ! Conf_PidFile[0] ) return;
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@ -660,18 +612,22 @@ Pidfile_Create( long pid )
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Log( LOG_DEBUG, "Creating PID file (%s) ...", Conf_PidFile );
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#endif
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pidf = fopen( Conf_PidFile, "w" );
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if( ! pidf )
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{
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pidfd = open( Conf_PidFile, O_RDWR|O_CREAT|O_EXCL, S_IRUSR|S_IWUSR|S_IRGRP|S_IROTH);
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if ( pidfd < 0 ) {
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Log( LOG_ERR, "Error writing PID file (%s): %s", Conf_PidFile, strerror( errno ));
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return;
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}
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if( fprintf( pidf, "%ld\n", pid ) < 0 )
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len = snprintf( pidbuf, sizeof pidbuf, "%ld\n", pid );
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if (len < 0|| len < (int)sizeof pid) {
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Log( LOG_ERR, "Error converting pid");
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return;
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}
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if( write( pidfd, pidbuf, len) != len)
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Log( LOG_ERR, "Can't write PID file (%s): %s", Conf_PidFile, strerror( errno ));
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if( fclose(pidf) != 0 )
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if( close(pidfd) != 0 )
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Log( LOG_ERR, "Error closing PID file (%s): %s", Conf_PidFile, strerror( errno ));
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} /* Pidfile_Create */
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@ -688,10 +644,13 @@ Setup_FDStreams( void )
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* we are most probably chrooted already and the server has been
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* restarted. So we simply don't try to redirect stdXXX ... */
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fd = open( "/dev/null", O_RDWR );
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if ( fd < 0 ) return;
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if ( fd < 0 ) {
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Log(LOG_WARNING, "Could not open /dev/null: %s", strerror(errno));
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return;
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}
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/* Close "old" stdin/out/err descriptors */
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close( 0 ); close( 1 ); close( 2 );
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fflush(stdout);
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fflush(stderr);
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/* Create new stdin(0), stdout(1) and stderr(2) descriptors */
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dup2( fd, 0 ); dup2( fd, 1 ); dup2( fd, 2 );
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@ -701,4 +660,146 @@ Setup_FDStreams( void )
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} /* Setup_FDStreams */
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LOCAL bool
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NGIRCd_getNobodyID(unsigned int *uid, unsigned int *gid )
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{
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struct passwd *pwd;
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pwd = getpwnam("nobody");
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if (!pwd) return false;
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if ( !pwd->pw_uid || !pwd->pw_gid)
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return false;
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*uid = pwd->pw_uid;
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*gid = pwd->pw_gid;
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endpwent();
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return true;
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}
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LOCAL bool
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NGIRCd_Init( bool NGIRCd_NoDaemon )
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{
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static bool initialized;
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bool chrooted = false;
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struct passwd *pwd;
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struct group *grp;
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int real_errno;
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long pid;
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if (initialized)
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return true;
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if( Conf_Chroot[0] ) {
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if( chdir( Conf_Chroot ) != 0 ) {
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Log( LOG_ERR, "Can't chdir() in ChrootDir (%s): %s", Conf_Chroot, strerror( errno ));
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return false;
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}
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if( chroot( Conf_Chroot ) != 0 ) {
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if (errno != EPERM) {
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Log( LOG_ERR, "Can't change root directory to \"%s\": %s",
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Conf_Chroot, strerror( errno ));
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return false;
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}
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} else {
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chrooted = true;
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Log( LOG_INFO, "Changed root and working directory to \"%s\".", Conf_Chroot );
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}
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}
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if ( Conf_UID == 0 ) {
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Log( LOG_INFO, "Conf_UID must not be 0, switching to user nobody", Conf_UID );
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if (!NGIRCd_getNobodyID(&Conf_UID, &Conf_GID )) {
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Log( LOG_WARNING, "Could not get uid/gid of user nobody: %s",
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errno ? strerror(errno) : "not found" );
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return false;
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}
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}
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if( setgid( Conf_GID ) != 0 ) {
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real_errno = errno;
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Log( LOG_ERR, "Can't change group ID to %u: %s", Conf_GID, strerror( errno ));
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if (real_errno != EPERM)
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return false;
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}
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if( setuid( Conf_UID ) != 0 ) {
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real_errno = errno;
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Log( LOG_ERR, "Can't change user ID to %u: %s", Conf_UID, strerror( errno ));
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if (real_errno != EPERM)
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return false;
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}
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initialized = true;
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/* Normally a child process is forked which isn't any longer
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* connected to ther controlling terminal. Use "--nodaemon"
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* to disable this "daemon mode" (useful for debugging). */
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if ( ! NGIRCd_NoDaemon ) {
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initialized = true;
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pid = (long)fork( );
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if( pid > 0 ) {
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/* "Old" process: exit. */
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exit( 0 );
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}
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if( pid < 0 ) {
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/* Error!? */
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fprintf( stderr, "%s: Can't fork: %s!\nFatal error, exiting now ...\n",
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PACKAGE_NAME, strerror( errno ));
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exit( 1 );
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}
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/* New child process */
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(void)setsid( );
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chdir( "/" );
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/* Detach stdin, stdout and stderr */
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Setup_FDStreams( );
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}
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pid = getpid();
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Pidfile_Create( pid );
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/* check uid we are running as, can be different from values configured (e.g. if we were already
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started with a uid > 0 */
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Conf_UID = getuid();
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Conf_GID = getgid();
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assert( Conf_GID > 0);
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assert( Conf_UID > 0);
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pwd = getpwuid( Conf_UID );
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grp = getgrgid( Conf_GID );
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Log( LOG_INFO, "Running as user %s(%ld), group %s(%ld), with PID %ld.",
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pwd ? pwd->pw_name : "unknown", Conf_UID,
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grp ? grp->gr_name : "unknown", Conf_GID, pid);
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if ( chrooted ) {
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Log( LOG_INFO, "Running chrooted, chrootdir \"%s\".", Conf_Chroot );
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return true;
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} else {
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Log( LOG_INFO, "Not running chrooted." );
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}
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/* Change working directory to home directory of the user
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* we are running as (when not running chroot()'ed!) */
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if ( pwd ) {
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if( chdir( pwd->pw_dir ) == 0 )
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Log( LOG_DEBUG, "Changed working directory to \"%s\" ...", pwd->pw_dir );
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else
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Log( LOG_ERR, "Can't change working directory to \"%s\": %s",
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pwd->pw_dir, strerror( errno ));
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} else {
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Log( LOG_ERR, "Can't get user informaton for UID %d!?", Conf_UID );
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}
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return true;
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}
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/* -eof- */
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