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[people/pmueller/ipfire-2.x.git] / src / misc-progs / restartssh.c

/* SmoothWall helper program - restartssh\r
 *\r
 * This program is distributed under the terms of the GNU General Public\r
 * Licence.  See the file COPYING for details.\r
 *\r
 * (c) Mark Wormgoor, 2001\r
 * Simple program intended to be installed setuid(0) that can be used for\r
 * restarting SSHd. \r
 * \r
 * $Id: restartssh.c,v 1.3 2003/12/11 10:57:34 riddles Exp $\r
 * \r
 */\r
\r
#include <stdio.h>\r
#include <stdlib.h>\r
#include <unistd.h>\r
#include <string.h>\r
#include <sys/types.h>\r
#include <fcntl.h>\r
#include <signal.h>\r
#include <errno.h>\r
#include "libsmooth.h"\r
#include "setuid.h"\r
\r
int main(void)\r
{\r
	int fd, config_fd, rc, pid;\r
	char buffer[STRING_SIZE], command[STRING_SIZE] = "/bin/sed -e '";\r
	struct keyvalue *kv = NULL;\r
\r
	if (!(initsetuid()))\r
		exit(1);\r
\r
	kv = initkeyvalues();\r
	if (!readkeyvalues(kv, CONFIG_ROOT "/remote/settings"))\r
	{\r
		fprintf(stderr, "Cannot read remote access settings\n");\r
		exit(1);\r
	}\r
\r
	/* By using O_CREAT with O_EXCL open() will fail if the file already exists,\r
	 * this prevents 2 copies of restartssh both trying to edit the config file\r
	 * at once. It also prevents race conditions, but these shouldn't be\r
	 * possible as /etc/ssh/ should only be writable by root anyhow\r
	 */\r
\r
	if ((config_fd = open( "/etc/ssh/sshd_config.new", O_WRONLY|O_CREAT|O_EXCL, 0644 )) == -1 )\r
	{\r
		perror("Unable to open new config file");\r
		freekeyvalues(kv);\r
		exit(1);\r
	}\r
\r
	if(findkey(kv, "ENABLE_SSH_PROTOCOL1", buffer) && !strcmp(buffer,"on"))\r
		strlcat(command, "s/^Protocol .*$/Protocol 2,1/;", STRING_SIZE - 1 );\r
	else\r
		strlcat(command, "s/^Protocol .*$/Protocol 2/;", STRING_SIZE - 1 );\r
\r
	if(findkey(kv, "ENABLE_SSH_KEYS", buffer) && !strcmp(buffer,"off"))\r
		strlcat(command, "s/^RSAAuthentication .*$/RSAAuthentication no/;"\r
		                 "s/^PubkeyAuthentication .*$/PubkeyAuthentication no/;",\r
		                  STRING_SIZE - 1 );\r
	else\r
		strlcat(command, "s/^RSAAuthentication .*$/RSAAuthentication yes/;"\r
		                 "s/^PubkeyAuthentication .*$/PubkeyAuthentication yes/;",\r
		                  STRING_SIZE - 1 );\r
\r
	if(findkey(kv, "ENABLE_SSH_PASSWORDS", buffer) && !strcmp(buffer,"off"))\r
		strlcat(command, "s/^PasswordAuthentication .*$/PasswordAuthentication no/;", STRING_SIZE - 1 );\r
	else\r
		strlcat(command, "s/^PasswordAuthentication .*$/PasswordAuthentication yes/;", STRING_SIZE - 1 );\r
\r
	if(findkey(kv, "ENABLE_SSH_PORTFW", buffer) && !strcmp(buffer,"on"))\r
		strlcat(command, "s/^AllowTcpForwarding .*$/AllowTcpForwarding yes/", STRING_SIZE - 1 );\r
	else\r
		strlcat(command, "s/^AllowTcpForwarding .*$/AllowTcpForwarding no/", STRING_SIZE - 1 );\r
\r
	freekeyvalues(kv);\r
\r
	snprintf(buffer, STRING_SIZE - 1, "' /etc/ssh/sshd_config >&%d", config_fd );\r
	strlcat(command, buffer, STRING_SIZE - 1);\r
\r
	if((rc = unpriv_system(command,99,99)) != 0)\r
	{\r
		fprintf(stderr, "sed returned bad exit code: %d\n", rc);\r
		close(config_fd);\r
		unlink("/etc/ssh/sshd_config.new");\r
		exit(1);\r
	}\r
	close(config_fd);\r
	if (rename("/etc/ssh/sshd_config.new","/etc/ssh/sshd_config") != 0)\r
	{\r
		perror("Unable to replace old config file");\r
		unlink("/etc/ssh/sshd_config.new");\r
		exit(1);\r
	}\r
\r
	memset(buffer, 0, STRING_SIZE);\r
\r
	if ((fd = open("/var/run/sshd.pid", O_RDONLY)) != -1)\r
	{\r
		if (read(fd, buffer, STRING_SIZE - 1) == -1)\r
			fprintf(stderr, "Couldn't read from pid file\n");\r
		else\r
		{\r
			pid = atoi(buffer);\r
			if (pid <= 1)\r
				fprintf(stderr, "Bad pid value\n");\r
			else\r
			{\r
				if (kill(pid, SIGTERM) == -1)\r
					fprintf(stderr, "Unable to send SIGTERM\n");\r
				else\r
					unlink("/var/run/sshd.pid");\r
			}\r
		}\r
		close(fd);\r
	}\r
	else\r
	{\r
		if (errno != ENOENT)\r
		{\r
			perror("Unable to open pid file");\r
			exit(1);\r
		}\r
	}\r
\r
	if ((fd = open(CONFIG_ROOT "/remote/enablessh", O_RDONLY)) != -1)\r
	{\r
		close(fd);\r
		safe_system("/usr/sbin/sshd");\r
	}\r
\r
	return 0;\r
}\r