mirror of
https://github.com/vincentmli/bpfire.git
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347 lines
10 KiB
C
347 lines
10 KiB
C
/*
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*
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* File originally from the Smoothwall project
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* (c) 2001 Smoothwall Team
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*
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*/
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#include "libsmooth.h"
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <signal.h>
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#include "setuid.h"
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#include "netutil.h"
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/*
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This module is responsible for start stop of the vpn system.
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1) it allows AH & ESP to get in from interface where a vpn is mounted
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The NAT traversal is used on the udp 4500 port.
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2) it starts the ipsec daemon
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The RED interface is a problem because it can be up or down a startup.
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Then, the state change and it must not affect other VPN mounted on
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other interface.
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Unfortunatly, openswan 1 cannot do that correctly. It cannot use an
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interface without restarting everything.
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*/
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void usage() {
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fprintf (stderr, "Usage:\n");
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fprintf (stderr, "\tipsecctrl S [connectionkey]\n");
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fprintf (stderr, "\tipsecctrl D [connectionkey]\n");
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fprintf (stderr, "\tipsecctrl R\n");
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fprintf (stderr, "\tipsecctrl I\n");
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fprintf (stderr, "\t\tS : Start/Restart Connection\n");
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fprintf (stderr, "\t\tD : Stop Connection\n");
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fprintf (stderr, "\t\tR : Reload Certificates and Secrets\n");
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fprintf (stderr, "\t\tI : Print Statusinfo\n");
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}
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static void ipsec_reload() {
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/* Re-read all configuration files and secrets and
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* reload the daemon (#10339).
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*/
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safe_system("/usr/sbin/ipsec rereadall >/dev/null 2>&1");
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safe_system("/usr/sbin/ipsec reload >/dev/null 2>&1");
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}
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/*
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ACCEPT the ipsec protocol ah, esp & udp (for nat traversal) on the specified interface
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*/
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void open_physical (char *interface, int nat_traversal_port) {
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char str[STRING_SIZE];
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// IKE
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sprintf(str, "/sbin/iptables --wait -D IPSECINPUT -p udp -i %s --dport 500 -j ACCEPT >/dev/null 2>&1", interface);
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safe_system(str);
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sprintf(str, "/sbin/iptables --wait -A IPSECINPUT -p udp -i %s --dport 500 -j ACCEPT", interface);
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safe_system(str);
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if (! nat_traversal_port)
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return;
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sprintf(str, "/sbin/iptables --wait -D IPSECINPUT -p udp -i %s --dport %i -j ACCEPT >/dev/null 2>&1", interface, nat_traversal_port);
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safe_system(str);
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sprintf(str, "/sbin/iptables --wait -A IPSECINPUT -p udp -i %s --dport %i -j ACCEPT", interface, nat_traversal_port);
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safe_system(str);
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}
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void ipsec_norules() {
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/* clear input rules */
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safe_system("/sbin/iptables --wait -F IPSECINPUT");
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safe_system("/sbin/iptables --wait -F IPSECFORWARD");
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safe_system("/sbin/iptables --wait -F IPSECOUTPUT");
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}
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/*
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return values from the vpn config file or false if not 'on'
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*/
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int decode_line (char *s,
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char **key,
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char **name,
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char **type
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) {
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int count = 0;
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*key = NULL;
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*name = NULL;
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*type = NULL;
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if (s[strlen(s) - 1] == '\n')
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s[strlen(s) - 1] = '\0';
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char *result = strsep(&s, ",");
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while (result) {
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if (count == 0)
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*key = result;
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if ((count == 1) && strcmp(result, "on") != 0)
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return 0; // a disabled line
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if (count == 2)
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*name = result;
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if (count == 4)
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*type = result;
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count++;
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result = strsep(&s, ",");
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}
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// check other syntax
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if (! *name)
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return 0;
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if (strspn(*name, LETTERS_NUMBERS) != strlen(*name)) {
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fprintf(stderr, "Bad connection name: %s\n", *name);
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return 0;
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}
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if (! (strcmp(*type, "host") == 0 || strcmp(*type, "net") == 0)) {
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fprintf(stderr, "Bad connection type: %s\n", *type);
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return 0;
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}
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//it's a valid & active line
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return 1;
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}
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/*
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issue ipsec commmands to turn on connection 'name'
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*/
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void turn_connection_on(char *name, char *type) {
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/*
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* To bring up a connection, we need to reload the configuration
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* and issue ipsec up afterwards. To make sure the connection
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* is not established from the start, we bring it down in advance.
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*/
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char command[STRING_SIZE];
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// Bring down the connection (if established).
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snprintf(command, STRING_SIZE - 1,
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"/usr/sbin/ipsec down %s >/dev/null", name);
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safe_system(command);
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// Reload the configuration into the daemon (#10339).
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ipsec_reload();
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// Bring the connection up again.
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snprintf(command, STRING_SIZE - 1,
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"/usr/sbin/ipsec up %s >/dev/null", name);
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safe_system(command);
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}
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/*
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issue ipsec commmands to turn off connection 'name'
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*/
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void turn_connection_off (char *name) {
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/*
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* To turn off a connection, all SAs must be turned down.
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* After that, the configuration must be reloaded.
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*/
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char command[STRING_SIZE];
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// Bring down the connection.
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snprintf(command, STRING_SIZE - 1,
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"/usr/sbin/ipsec down %s >/dev/null", name);
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safe_system(command);
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// Reload, so the connection is dropped.
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ipsec_reload();
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}
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int main(int argc, char *argv[]) {
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char configtype[STRING_SIZE];
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char redtype[STRING_SIZE] = "";
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struct keyvalue *kv = NULL;
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if (argc < 2) {
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usage();
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exit(1);
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}
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if (!(initsetuid()))
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exit(1);
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FILE *file = NULL;
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if (strcmp(argv[1], "I") == 0) {
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safe_system("/usr/sbin/ipsec status");
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exit(0);
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}
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if (strcmp(argv[1], "R") == 0) {
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ipsec_reload();
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exit(0);
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}
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/* FIXME: workaround for pclose() issue - still no real idea why
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* this is happening */
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signal(SIGCHLD, SIG_DFL);
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/* handle operations that doesn't need start the ipsec system */
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if (argc == 2) {
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if (strcmp(argv[1], "D") == 0) {
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safe_system("/usr/sbin/ipsec stop >/dev/null 2>&1");
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ipsec_norules();
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exit(0);
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}
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}
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/* read vpn config */
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kv=initkeyvalues();
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if (!readkeyvalues(kv, CONFIG_ROOT "/vpn/settings"))
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{
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fprintf(stderr, "Cannot read vpn settings\n");
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exit(1);
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}
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/* check is the vpn system is enabled */
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{
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char s[STRING_SIZE];
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findkey(kv, "ENABLED", s);
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freekeyvalues(kv);
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if (strcmp (s, "on") != 0)
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exit(0);
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}
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/* read interface settings */
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kv=initkeyvalues();
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if (!readkeyvalues(kv, CONFIG_ROOT "/ethernet/settings"))
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{
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fprintf(stderr, "Cannot read ethernet settings\n");
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exit(1);
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}
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if (!findkey(kv, "CONFIG_TYPE", configtype))
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{
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fprintf(stderr, "Cannot read CONFIG_TYPE\n");
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exit(1);
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}
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findkey(kv, "RED_TYPE", redtype);
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/* Loop through the config file to find physical interface that will accept IPSEC */
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int enable_red=0; // states 0: not used
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int enable_green=0; // 1: error condition
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int enable_orange=0; // 2: good
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int enable_blue=0;
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char if_red[STRING_SIZE] = "";
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char if_green[STRING_SIZE] = "";
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char if_orange[STRING_SIZE] = "";
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char if_blue[STRING_SIZE] = "";
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char s[STRING_SIZE];
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// when RED is up, find interface name in special file
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FILE *ifacefile = NULL;
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if ((ifacefile = fopen(CONFIG_ROOT "/red/iface", "r"))) {
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if (fgets(if_red, STRING_SIZE, ifacefile)) {
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if (if_red[strlen(if_red) - 1] == '\n')
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if_red[strlen(if_red) - 1] = '\0';
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}
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fclose (ifacefile);
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if (VALID_DEVICE(if_red))
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enable_red++;
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}
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// Check if GREEN is enabled.
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findkey(kv, "GREEN_DEV", if_green);
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if (VALID_DEVICE(if_green))
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enable_green++;
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// Check if ORANGE is enabled.
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findkey(kv, "ORANGE_DEV", if_orange);
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if (VALID_DEVICE(if_orange))
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enable_orange++;
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// Check if BLUE is enabled.
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findkey(kv, "BLUE_DEV", if_blue);
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if (VALID_DEVICE(if_blue))
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enable_blue++;
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freekeyvalues(kv);
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// exit if nothing to do
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if ((enable_red+enable_green+enable_orange+enable_blue) == 0)
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exit(0);
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// open needed ports
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if (enable_red > 0)
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open_physical(if_red, 4500);
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if (enable_green > 0)
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open_physical(if_green, 4500);
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if (enable_orange > 0)
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open_physical(if_orange, 4500);
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if (enable_blue > 0)
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open_physical(if_blue, 4500);
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// start the system
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if ((argc == 2) && strcmp(argv[1], "S") == 0) {
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safe_system("/usr/sbin/ipsec restart >/dev/null");
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exit(0);
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}
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// it is a selective start or stop
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// second param is only a number 'key'
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if ((argc == 2) || strspn(argv[2], NUMBERS) != strlen(argv[2])) {
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fprintf(stderr, "Bad arg: %s\n", argv[2]);
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usage();
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exit(1);
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}
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// search the vpn pointed by 'key'
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if (!(file = fopen(CONFIG_ROOT "/vpn/config", "r"))) {
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fprintf(stderr, "Couldn't open vpn settings file");
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exit(1);
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}
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while (fgets(s, STRING_SIZE, file) != NULL) {
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char *key;
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char *name;
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char *type;
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if (!decode_line(s,&key,&name,&type))
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continue;
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// is it the 'key' requested ?
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if (strcmp(argv[2], key) != 0)
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continue;
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// Start or Delete this Connection
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if (strcmp(argv[1], "S") == 0)
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turn_connection_on (name, type);
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else if (strcmp(argv[1], "D") == 0)
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turn_connection_off (name);
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else {
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fprintf(stderr, "Bad command\n");
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exit(1);
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}
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}
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fclose(file);
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return 0;
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}
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