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openvpn.c
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openvpn.c
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/*
Copyright (C) 2008-2010 Keith Moyer, tomatovpn@keithmoyer.com
No part of this file may be used without permission.
*/
#include "rc.h"
#include <sys/types.h>
#include <sys/wait.h>
#include <dirent.h>
#include <string.h>
#include <time.h>
// Line number as text string
#define __LINE_T__ __LINE_T_(__LINE__)
#define __LINE_T_(x) __LINE_T(x)
#define __LINE_T(x) # x
#define VPN_LOG_ERROR -1
#define VPN_LOG_NOTE 0
#define VPN_LOG_INFO 1
#define VPN_LOG_EXTRA 2
#define vpnlog(level,x...) if(nvram_get_int("vpn_debug")>=level) syslog(LOG_INFO, #level ": " __LINE_T__ ": " x)
#define CLIENT_IF_START 10
#define SERVER_IF_START 20
#define BUF_SIZE 256
#define IF_SIZE 8
static int ovpn_waitfor(const char *name)
{
int pid, n = 5;
killall_tk(name);
while ( (pid = pidof(name)) >= 0 && (n-- > 0) )
{
// Reap the zombie if it has terminated
waitpid(pid, NULL, WNOHANG);
sleep(1);
}
return (pid >= 0);
}
void start_vpnclient(int clientNum)
{
FILE *fp;
char iface[IF_SIZE];
char buffer[BUF_SIZE];
char buffer2[4000];
char *argv[6];
int argc = 0;
enum { TLS, SECRET, CUSTOM } cryptMode = CUSTOM;
enum { TAP, TUN } ifType = TUN;
enum { BRIDGE, NAT, NONE } routeMode = NONE;
int nvi, ip[4], nm[4];
long int nvl;
int pid;
int userauth, useronly;
int taskset_ret;
int i;
sprintf(&buffer[0], "start_vpnclient%d", clientNum);
if (getpid() != 1) {
notify_rc(&buffer[0]);
return;
}
for ( i = 1; i < 4; i++ ) {
if (!nvram_get_int("ntp_ready")) {
sleep(i*i);
} else {
i = 4;
}
}
vpnlog(VPN_LOG_INFO,"VPN GUI client backend starting...");
if ( (pid = pidof(&buffer[6])) >= 0 )
{
vpnlog(VPN_LOG_NOTE, "VPN Client %d already running...", clientNum);
vpnlog(VPN_LOG_INFO,"PID: %d", pid);
return;
}
sprintf(&buffer[0], "vpn_client%d_state", clientNum);
nvram_set(&buffer[0], "1"); //initializing
sprintf(&buffer[0], "vpn_client%d_errno", clientNum);
nvram_set(&buffer[0], "0");
// Determine interface
sprintf(&buffer[0], "vpn_client%d_if", clientNum);
if ( nvram_contains_word(&buffer[0], "tap") )
ifType = TAP;
else if ( nvram_contains_word(&buffer[0], "tun") )
ifType = TUN;
else
{
vpnlog(VPN_LOG_ERROR, "Invalid interface type, %.3s", nvram_safe_get(&buffer[0]));
return;
}
// Build interface name
snprintf(&iface[0], IF_SIZE, "%s%d", nvram_safe_get(&buffer[0]), clientNum+CLIENT_IF_START);
// Determine encryption mode
sprintf(&buffer[0], "vpn_client%d_crypt", clientNum);
if ( nvram_contains_word(&buffer[0], "tls") )
cryptMode = TLS;
else if ( nvram_contains_word(&buffer[0], "secret") )
cryptMode = SECRET;
else if ( nvram_contains_word(&buffer[0], "custom") )
cryptMode = CUSTOM;
else
{
vpnlog(VPN_LOG_ERROR,"Invalid encryption mode, %.6s", nvram_safe_get(&buffer[0]));
return;
}
// Determine if we should bridge the tunnel
sprintf(&buffer[0], "vpn_client%d_bridge", clientNum);
if ( ifType == TAP && nvram_get_int(&buffer[0]) == 1 )
routeMode = BRIDGE;
// Determine if we should NAT the tunnel
sprintf(&buffer[0], "vpn_client%d_nat", clientNum);
if ( (ifType == TUN || routeMode != BRIDGE) && nvram_get_int(&buffer[0]) == 1 )
routeMode = NAT;
// Make sure openvpn directory exists
mkdir("/etc/openvpn", 0700);
sprintf(&buffer[0], "/etc/openvpn/client%d", clientNum);
mkdir(&buffer[0], 0700);
// Make sure symbolic link exists
sprintf(&buffer[0], "/etc/openvpn/vpnclient%d", clientNum);
unlink(&buffer[0]);
if ( symlink("/usr/sbin/openvpn", &buffer[0]) )
{
vpnlog(VPN_LOG_ERROR,"Creating symlink failed...");
stop_vpnclient(clientNum);
return;
}
// Make sure module is loaded
modprobe("tun");
f_wait_exists("/dev/net/tun", 5);
// Create tap/tun interface
sprintf(&buffer[0], "openvpn --mktun --dev %s", &iface[0]);
for (argv[argc=0] = strtok(&buffer[0], " "); argv[argc] != NULL; argv[++argc] = strtok(NULL, " "));
if ( _eval(argv, NULL, 0, NULL) )
{
vpnlog(VPN_LOG_ERROR,"Creating tunnel interface %s failed...",&iface[0]);
stop_vpnclient(clientNum);
return;
}
// Bring interface up (TAP only)
if( ifType == TAP )
{
if ( routeMode == BRIDGE )
{
snprintf(&buffer[0], BUF_SIZE, "brctl addif %s %s", nvram_safe_get("lan_ifname"), &iface[0]);
for (argv[argc=0] = strtok(&buffer[0], " "); argv[argc] != NULL; argv[++argc] = strtok(NULL, " "));
if ( _eval(argv, NULL, 0, NULL) )
{
vpnlog(VPN_LOG_ERROR,"Adding tunnel interface to bridge failed...");
stop_vpnclient(clientNum);
return;
}
}
snprintf(&buffer[0], BUF_SIZE, "ifconfig %s promisc up", &iface[0]);
for (argv[argc=0] = strtok(&buffer[0], " "); argv[argc] != NULL; argv[++argc] = strtok(NULL, " "));
if ( _eval(argv, NULL, 0, NULL) )
{
vpnlog(VPN_LOG_ERROR,"Bringing interface up failed...");
stop_vpnclient(clientNum);
return;
}
}
sprintf(&buffer[0], "vpn_client%d_userauth", clientNum);
userauth = nvram_get_int(&buffer[0]);
sprintf(&buffer[0], "vpn_client%d_useronly", clientNum);
useronly = userauth && nvram_get_int(&buffer[0]);
// Build and write config file
vpnlog(VPN_LOG_EXTRA,"Writing config file");
sprintf(&buffer[0], "/etc/openvpn/client%d/config.ovpn", clientNum);
fp = fopen(&buffer[0], "w");
chmod(&buffer[0], S_IRUSR|S_IWUSR);
fprintf(fp, "# Automatically generated configuration\n");
fprintf(fp, "daemon\n");
if ( cryptMode == TLS )
fprintf(fp, "client\n");
fprintf(fp, "dev %s\n", &iface[0]);
sprintf(&buffer[0], "vpn_client%d_proto", clientNum);
fprintf(fp, "proto %s\n", nvram_safe_get(&buffer[0]));
sprintf(&buffer[0], "vpn_client%d_addr", clientNum);
fprintf(fp, "remote %s ", nvram_safe_get(&buffer[0]));
sprintf(&buffer[0], "vpn_client%d_port", clientNum);
fprintf(fp, "%d\n", nvram_get_int(&buffer[0]));
if ( cryptMode == SECRET )
{
if ( ifType == TUN )
{
sprintf(&buffer[0], "vpn_client%d_local", clientNum);
fprintf(fp, "ifconfig %s ", nvram_safe_get(&buffer[0]));
sprintf(&buffer[0], "vpn_client%d_remote", clientNum);
fprintf(fp, "%s\n", nvram_safe_get(&buffer[0]));
}
else if ( ifType == TAP )
{
sprintf(&buffer[0], "vpn_client%d_local", clientNum);
fprintf(fp, "ifconfig %s ", nvram_safe_get(&buffer[0]));
sprintf(&buffer[0], "vpn_client%d_nm", clientNum);
fprintf(fp, "%s\n", nvram_safe_get(&buffer[0]));
}
}
sprintf(&buffer[0], "vpn_client%d_retry", clientNum);
if ( (nvi = nvram_get_int(&buffer[0])) >= 0 )
fprintf(fp, "resolv-retry %d\n", nvi);
else
fprintf(fp, "resolv-retry infinite\n");
fprintf(fp, "nobind\n");
fprintf(fp, "persist-key\n");
fprintf(fp, "persist-tun\n");
sprintf(&buffer[0], "vpn_client%d_comp", clientNum);
if ( nvram_get_int(&buffer[0]) >= 0 )
fprintf(fp, "comp-lzo %s\n", nvram_safe_get(&buffer[0]));
sprintf(&buffer[0], "vpn_client%d_cipher", clientNum);
if ( !nvram_contains_word(&buffer[0], "default") )
fprintf(fp, "cipher %s\n", nvram_safe_get(&buffer[0]));
sprintf(&buffer[0], "vpn_client%d_rgw", clientNum);
nvi = nvram_get_int(&buffer[0]);
if (nvi == 1)
{
sprintf(&buffer[0], "vpn_client%d_gw", clientNum);
if ( ifType == TAP && nvram_safe_get(&buffer[0])[0] != '\0' )
fprintf(fp, "route-gateway %s\n", nvram_safe_get(&buffer[0]));
fprintf(fp, "redirect-gateway def1\n");
}
// For selective routing
sprintf(&buffer[0], "/etc/openvpn/client%d/vpnrouting.sh", clientNum);
symlink("/usr/sbin/vpnrouting.sh", &buffer[0]);
fprintf(fp, "script-security 2\n"); // also for up/down scripts
fprintf(fp, "route-delay 2\n");
fprintf(fp, "route-up vpnrouting.sh\n");
fprintf(fp, "route-pre-down vpnrouting.sh\n");
nvi = nvram_get_int("vpn_loglevel");
if (nvi >= 0)
fprintf(fp, "verb %d\n", nvi);
else
fprintf(fp, "verb 3\n");
if ( cryptMode == TLS )
{
sprintf(&buffer[0], "vpn_client%d_reneg", clientNum);
if ( (nvl = atol(nvram_safe_get(&buffer[0]))) >= 0 )
fprintf(fp, "reneg-sec %ld\n", nvl);
sprintf(&buffer[0], "vpn_client%d_adns", clientNum);
if ( nvram_get_int(&buffer[0]) > 0 )
{
sprintf(&buffer[0], "/etc/openvpn/client%d/updown.sh", clientNum);
symlink("/usr/sbin/updown.sh", &buffer[0]);
fprintf(fp, "up updown.sh\n");
fprintf(fp, "down updown.sh\n");
}
sprintf(&buffer[0], "vpn_client%d_hmac", clientNum);
nvi = nvram_get_int(&buffer[0]);
sprintf(&buffer[0], "vpn_crt_client%d_static", clientNum);
if ( !nvram_is_empty(&buffer[0]) && nvi >= 0 )
{
fprintf(fp, "tls-auth static.key");
if ( nvi < 2 )
fprintf(fp, " %d", nvi);
fprintf(fp, "\n");
}
sprintf(&buffer[0], "vpn_crt_client%d_ca", clientNum);
if ( !nvram_is_empty(&buffer[0]) )
fprintf(fp, "ca ca.crt\n");
if (!useronly)
{
sprintf(&buffer[0], "vpn_crt_client%d_crt", clientNum);
if ( !nvram_is_empty(&buffer[0]) )
fprintf(fp, "cert client.crt\n");
sprintf(&buffer[0], "vpn_crt_client%d_key", clientNum);
if ( !nvram_is_empty(&buffer[0]) )
fprintf(fp, "key client.key\n");
}
sprintf(&buffer[0], "vpn_client%d_tlsremote", clientNum);
if (nvram_get_int(&buffer[0]))
{
sprintf(&buffer[0], "vpn_client%d_cn", clientNum);
fprintf(fp, "tls-remote %s\n", nvram_safe_get(&buffer[0]));
}
if (userauth)
fprintf(fp, "auth-user-pass up\n");
sprintf(&buffer[0], "vpn_crt_client%d_crl", clientNum);
if ( !nvram_is_empty(&buffer[0]) )
fprintf(fp, "crl-verify crl.pem\n");
}
else if ( cryptMode == SECRET )
{
sprintf(&buffer[0], "vpn_crt_client%d_static", clientNum);
if ( !nvram_is_empty(&buffer[0]) )
fprintf(fp, "secret static.key\n");
}
// All other cryptmodes need a default up/down script set
if ( (cryptMode != TLS) && (check_if_file_exist("/jffs/scripts/openvpn-event")) )
{
sprintf(&buffer[0], "/etc/openvpn/client%d/updown.sh", clientNum);
symlink("/jffs/scripts/openvpn-event", &buffer[0]);
fprintf(fp, "up updown.sh\n");
fprintf(fp, "down updown.sh\n");
}
fprintf(fp, "status-version 2\n");
fprintf(fp, "status status\n");
fprintf(fp, "\n# Custom Configuration\n");
sprintf(&buffer[0], "vpn_client%d_custom", clientNum);
fprintf(fp, "%s", nvram_safe_get(&buffer[0]));
fclose(fp);
vpnlog(VPN_LOG_EXTRA,"Done writing config file");
// Write certification and key files
vpnlog(VPN_LOG_EXTRA,"Writing certs/keys");
if ( cryptMode == TLS )
{
sprintf(&buffer[0], "vpn_crt_client%d_ca", clientNum);
if ( !nvram_is_empty(&buffer[0]) )
{
sprintf(&buffer[0], "/etc/openvpn/client%d/ca.crt", clientNum);
fp = fopen(&buffer[0], "w");
chmod(&buffer[0], S_IRUSR|S_IWUSR);
sprintf(&buffer[0], "vpn_crt_client%d_ca", clientNum);
fprintf(fp, "%s", get_parsed_crt(&buffer[0], buffer2));
fclose(fp);
}
if (!useronly)
{
sprintf(&buffer[0], "vpn_crt_client%d_key", clientNum);
if ( !nvram_is_empty(&buffer[0]) )
{
sprintf(&buffer[0], "/etc/openvpn/client%d/client.key", clientNum);
fp = fopen(&buffer[0], "w");
chmod(&buffer[0], S_IRUSR|S_IWUSR);
sprintf(&buffer[0], "vpn_crt_client%d_key", clientNum);
fprintf(fp, "%s", get_parsed_crt(&buffer[0], buffer2));
fclose(fp);
}
sprintf(&buffer[0], "vpn_crt_client%d_crt", clientNum);
if ( !nvram_is_empty(&buffer[0]) )
{
sprintf(&buffer[0], "/etc/openvpn/client%d/client.crt", clientNum);
fp = fopen(&buffer[0], "w");
chmod(&buffer[0], S_IRUSR|S_IWUSR);
sprintf(&buffer[0], "vpn_crt_client%d_crt", clientNum);
fprintf(fp, "%s", get_parsed_crt(&buffer[0], buffer2));
fclose(fp);
}
}
if (userauth)
{
sprintf(&buffer[0], "/etc/openvpn/client%d/up", clientNum);
fp = fopen(&buffer[0], "w");
chmod(&buffer[0], S_IRUSR|S_IWUSR);
sprintf(&buffer[0], "vpn_client%d_username", clientNum);
fprintf(fp, "%s\n", nvram_safe_get(&buffer[0]));
sprintf(&buffer[0], "vpn_client%d_password", clientNum);
fprintf(fp, "%s\n", nvram_safe_get(&buffer[0]));
fclose(fp);
}
sprintf(&buffer[0], "vpn_crt_client%d_crl", clientNum);
if ( !nvram_is_empty(&buffer[0]) )
{
sprintf(&buffer[0], "/etc/openvpn/client%d/crl.pem", clientNum);
fp = fopen(&buffer[0], "w");
chmod(&buffer[0], S_IRUSR|S_IWUSR);
sprintf(&buffer[0], "vpn_crt_client%d_crl", clientNum);
fprintf(fp, "%s", get_parsed_crt(&buffer[0], buffer2));
fclose(fp);
}
}
sprintf(&buffer[0], "vpn_client%d_hmac", clientNum);
if ( cryptMode == SECRET || (cryptMode == TLS && nvram_get_int(&buffer[0]) >= 0) )
{
sprintf(&buffer[0], "vpn_crt_client%d_static", clientNum);
if ( !nvram_is_empty(&buffer[0]) )
{
sprintf(&buffer[0], "/etc/openvpn/client%d/static.key", clientNum);
fp = fopen(&buffer[0], "w");
chmod(&buffer[0], S_IRUSR|S_IWUSR);
sprintf(&buffer[0], "vpn_crt_client%d_static", clientNum);
fprintf(fp, "%s", get_parsed_crt(&buffer[0], buffer2));
fclose(fp);
}
}
vpnlog(VPN_LOG_EXTRA,"Done writing certs/keys");
// Run postconf custom script on it if it exists
sprintf(&buffer[0], "openvpnclient%d", clientNum);
sprintf(&buffer2[0], "/etc/openvpn/client%d/config.ovpn", clientNum);
run_postconf(&buffer[0], &buffer2[0]);
// Start the VPN client
sprintf(&buffer[0], "/etc/openvpn/vpnclient%d", clientNum);
sprintf(&buffer2[0], "/etc/openvpn/client%d", clientNum);
taskset_ret = cpu_eval(NULL, (clientNum == 1 ? CPU1 : CPU0), &buffer[0], "--cd", &buffer2[0], "--config", "config.ovpn");
vpnlog(VPN_LOG_INFO,"Starting OpenVPN client %d", clientNum);
if (taskset_ret)
{
vpnlog(VPN_LOG_ERROR,"Starting OpenVPN failed...");
stop_vpnclient(clientNum);
return;
}
vpnlog(VPN_LOG_EXTRA,"Done starting openvpn");
// Handle firewall rules if appropriate
sprintf(&buffer[0], "vpn_client%d_firewall", clientNum);
if ( !nvram_contains_word(&buffer[0], "custom") )
{
// Create firewall rules
vpnlog(VPN_LOG_EXTRA,"Creating firewall rules");
mkdir("/etc/openvpn/fw", 0700);
sprintf(&buffer[0], "/etc/openvpn/fw/client%d-fw.sh", clientNum);
fp = fopen(&buffer[0], "w");
chmod(&buffer[0], S_IRUSR|S_IWUSR|S_IXUSR);
fprintf(fp, "#!/bin/sh\n");
fprintf(fp, "iptables -I INPUT -i %s -j ACCEPT\n", &iface[0]);
fprintf(fp, "iptables -I FORWARD %d -i %s -j ACCEPT\n", (nvram_match("cstats_enable", "1") ? 4 : 2), &iface[0]);
// Setup traffic accounting
if (nvram_match("cstats_enable", "1")) {
ipt_account(fp, &iface[0]);
}
if ( routeMode == NAT )
{
sscanf(nvram_safe_get("lan_ipaddr"), "%d.%d.%d.%d", &ip[0], &ip[1], &ip[2], &ip[3]);
sscanf(nvram_safe_get("lan_netmask"), "%d.%d.%d.%d", &nm[0], &nm[1], &nm[2], &nm[3]);
fprintf(fp, "iptables -t nat -I POSTROUTING -s %d.%d.%d.%d/%s -o %s -j MASQUERADE\n",
ip[0]&nm[0], ip[1]&nm[1], ip[2]&nm[2], ip[3]&nm[3], nvram_safe_get("lan_netmask"), &iface[0]);
}
fclose(fp);
vpnlog(VPN_LOG_EXTRA,"Done creating firewall rules");
// Run the firewall rules
vpnlog(VPN_LOG_EXTRA,"Running firewall rules");
sprintf(&buffer[0], "/etc/openvpn/fw/client%d-fw.sh", clientNum);
argv[0] = &buffer[0];
argv[1] = NULL;
_eval(argv, NULL, 0, NULL);
vpnlog(VPN_LOG_EXTRA,"Done running firewall rules");
}
// Set up cron job
sprintf(&buffer[0], "vpn_client%d_poll", clientNum);
if ( (nvi = nvram_get_int(&buffer[0])) > 0 )
{
vpnlog(VPN_LOG_EXTRA,"Adding cron job");
argv[0] = "cru";
argv[1] = "a";
sprintf(&buffer[0], "CheckVPNClient%d", clientNum);
argv[2] = &buffer[0];
sprintf(&buffer[strlen(&buffer[0])+1], "*/%d * * * * service start_vpnclient%d", nvi, clientNum);
argv[3] = &buffer[strlen(&buffer[0])+1];
argv[4] = NULL;
_eval(argv, NULL, 0, NULL);
vpnlog(VPN_LOG_EXTRA,"Done adding cron job");
}
#ifdef LINUX26
// sprintf(&buffer[0], "vpn_client%d", clientNum);
// allow_fastnat(buffer, 0);
// try_enabling_fastnat();
#endif
vpnlog(VPN_LOG_INFO,"VPN GUI client backend complete.");
}
void stop_vpnclient(int clientNum)
{
int argc;
char *argv[7];
char buffer[BUF_SIZE];
sprintf(&buffer[0], "stop_vpnclient%d", clientNum);
if (getpid() != 1) {
notify_rc(&buffer[0]);
return;
}
vpnlog(VPN_LOG_INFO,"Stopping VPN GUI client backend.");
// Remove cron job
vpnlog(VPN_LOG_EXTRA,"Removing cron job");
argv[0] = "cru";
argv[1] = "d";
sprintf(&buffer[0], "CheckVPNClient%d", clientNum);
argv[2] = &buffer[0];
argv[3] = NULL;
_eval(argv, NULL, 0, NULL);
vpnlog(VPN_LOG_EXTRA,"Done removing cron job");
// Remove firewall rules
vpnlog(VPN_LOG_EXTRA,"Removing firewall rules.");
sprintf(&buffer[0], "/etc/openvpn/fw/client%d-fw.sh", clientNum);
argv[0] = "sed";
argv[1] = "-i";
argv[2] = "s/-A/-D/g;s/-I/-D/g;s/FORWARD\\ [0-9]\\ /FORWARD\\ /g";
argv[3] = &buffer[0];
argv[4] = NULL;
if (!_eval(argv, NULL, 0, NULL))
{
argv[0] = &buffer[0];
argv[1] = NULL;
_eval(argv, NULL, 0, NULL);
}
vpnlog(VPN_LOG_EXTRA,"Done removing firewall rules.");
// Stop the VPN client
vpnlog(VPN_LOG_EXTRA,"Stopping OpenVPN client.");
sprintf(&buffer[0], "vpnclient%d", clientNum);
if ( !ovpn_waitfor(&buffer[0]) )
vpnlog(VPN_LOG_EXTRA,"OpenVPN client stopped.");
// NVRAM setting for device type could have changed, just try to remove both
vpnlog(VPN_LOG_EXTRA,"Removing VPN device.");
sprintf(&buffer[0], "openvpn --rmtun --dev tap%d", clientNum+CLIENT_IF_START);
for (argv[argc=0] = strtok(&buffer[0], " "); argv[argc] != NULL; argv[++argc] = strtok(NULL, " "));
_eval(argv, NULL, 0, NULL);
sprintf(&buffer[0], "openvpn --rmtun --dev tun%d", clientNum+CLIENT_IF_START);
for (argv[argc=0] = strtok(&buffer[0], " "); argv[argc] != NULL; argv[++argc] = strtok(NULL, " "));
_eval(argv, NULL, 0, NULL);
vpnlog(VPN_LOG_EXTRA,"VPN device removed.");
modprobe_r("tun");
if ( nvram_get_int("vpn_debug") <= VPN_LOG_EXTRA )
{
vpnlog(VPN_LOG_EXTRA,"Removing generated files.");
// Delete all files for this client
sprintf(&buffer[0], "rm -rf /etc/openvpn/client%d /etc/openvpn/fw/client%d-fw.sh /etc/openvpn/vpnclient%d /etc/openvpn/dns/client%d.resolv",clientNum,clientNum,clientNum,clientNum);
for (argv[argc=0] = strtok(&buffer[0], " "); argv[argc] != NULL; argv[++argc] = strtok(NULL, " "));
_eval(argv, NULL, 0, NULL);
// Attempt to remove directories. Will fail if not empty
rmdir("/etc/openvpn/fw");
rmdir("/etc/openvpn/dns");
rmdir("/etc/openvpn");
vpnlog(VPN_LOG_EXTRA,"Done removing generated files.");
}
#ifdef LINUX26
// sprintf(&buffer[0], "vpn_client%d", clientNum);
// allow_fastnat(buffer, 1);
// try_enabling_fastnat();
#endif
sprintf(&buffer[0], "vpn_client%d_state", clientNum);
nvram_set(&buffer[0], "0");
sprintf(&buffer[0], "vpn_client%d_errno", clientNum);
nvram_set(&buffer[0], "0");
update_resolvconf();
start_dnsmasq();
vpnlog(VPN_LOG_INFO,"VPN GUI client backend stopped.");
}
void start_vpnserver(int serverNum)
{
FILE *fp, *ccd, *fp_client;;
char iface[IF_SIZE];
char buffer[BUF_SIZE];
char buffer2[4000];
char *argv[6], *chp, *route;
int argc = 0;
int c2c = 0;
enum { TAP, TUN } ifType = TUN;
enum { TLS, SECRET, CUSTOM } cryptMode = CUSTOM;
int nvi, ip[4], nm[4];
long int nvl;
int pid;
int taskset_ret;
char nv1[32], nv2[32], nv3[32], fpath[128];
int valid = 0;
int userauth = 0, useronly = 0;
int i;
sprintf(&buffer[0], "start_vpnserver%d", serverNum);
if (getpid() != 1) {
notify_rc(&buffer[0]);
return;
}
for ( i = 1; i < 4; i++ ) {
if (!nvram_get_int("ntp_ready")) {
sleep(i*i);
} else {
i = 4;
}
}
vpnlog(VPN_LOG_INFO,"VPN GUI server backend starting...");
if ( (pid = pidof(&buffer[6])) >= 0 )
{
vpnlog(VPN_LOG_NOTE, "VPN Server %d already running...", serverNum);
vpnlog(VPN_LOG_INFO,"PID: %d", pid);
return;
}
sprintf(&buffer[0], "vpn_server%d_state", serverNum);
nvram_set(&buffer[0], "1"); //initializing
sprintf(&buffer[0], "vpn_server%d_errno", serverNum);
nvram_set(&buffer[0], "0");
// Determine interface type
sprintf(&buffer[0], "vpn_server%d_if", serverNum);
if ( nvram_contains_word(&buffer[0], "tap") )
ifType = TAP;
else if ( nvram_contains_word(&buffer[0], "tun") )
ifType = TUN;
else
{
vpnlog(VPN_LOG_ERROR,"Invalid interface type, %.3s", nvram_safe_get(&buffer[0]));
return;
}
// Build interface name
snprintf(&iface[0], IF_SIZE, "%s%d", nvram_safe_get(&buffer[0]), serverNum+SERVER_IF_START);
//
if(is_intf_up(&iface[0]) && ifType == TAP) {
eval("brctl", "delif", nvram_safe_get("lan_ifname"), &iface[0]);
}
// Determine encryption mode
sprintf(&buffer[0], "vpn_server%d_crypt", serverNum);
if ( nvram_contains_word(&buffer[0], "tls") )
cryptMode = TLS;
else if ( nvram_contains_word(&buffer[0], "secret") )
cryptMode = SECRET;
else if ( nvram_contains_word(&buffer[0], "custom") )
cryptMode = CUSTOM;
else
{
vpnlog(VPN_LOG_ERROR,"Invalid encryption mode, %.6s", nvram_safe_get(&buffer[0]));
return;
}
// Make sure openvpn directory exists
mkdir("/etc/openvpn", 0700);
sprintf(&buffer[0], "/etc/openvpn/server%d", serverNum);
mkdir(&buffer[0], 0700);
// Make sure symbolic link exists
sprintf(&buffer[0], "/etc/openvpn/vpnserver%d", serverNum);
unlink(&buffer[0]);
if ( symlink("/usr/sbin/openvpn", &buffer[0]) )
{
vpnlog(VPN_LOG_ERROR,"Creating symlink failed...");
stop_vpnserver(serverNum);
return;
}
// Make sure module is loaded
modprobe("tun");
f_wait_exists("/dev/net/tun", 5);
// Create tap/tun interface
sprintf(&buffer[0], "openvpn --mktun --dev %s", &iface[0]);
for (argv[argc=0] = strtok(&buffer[0], " "); argv[argc] != NULL; argv[++argc] = strtok(NULL, " "));
if ( _eval(argv, NULL, 0, NULL) )
{
vpnlog(VPN_LOG_ERROR,"Creating tunnel interface %s failed...",&iface[0]);
stop_vpnserver(serverNum);
return;
}
// Add interface to LAN bridge (TAP only)
if( ifType == TAP )
{
snprintf(&buffer[0], BUF_SIZE, "brctl addif %s %s", nvram_safe_get("lan_ifname"), &iface[0]);
for (argv[argc=0] = strtok(&buffer[0], " "); argv[argc] != NULL; argv[++argc] = strtok(NULL, " "));
if ( _eval(argv, NULL, 0, NULL) )
{
vpnlog(VPN_LOG_ERROR,"Adding tunnel interface to bridge failed...");
stop_vpnserver(serverNum);
return;
}
}
// Bring interface up
sprintf(&buffer[0], "ifconfig %s 0.0.0.0 promisc up", &iface[0]);
for (argv[argc=0] = strtok(&buffer[0], " "); argv[argc] != NULL; argv[++argc] = strtok(NULL, " "));
if ( _eval(argv, NULL, 0, NULL) )
{
vpnlog(VPN_LOG_ERROR,"Bringing up tunnel interface failed...");
stop_vpnserver(serverNum);
return;
}
// Build and write config files
vpnlog(VPN_LOG_EXTRA,"Writing config file");
sprintf(&buffer[0], "/etc/openvpn/server%d/config.ovpn", serverNum);
fp = fopen(&buffer[0], "w");
chmod(&buffer[0], S_IRUSR|S_IWUSR);
fprintf(fp, "# Automatically generated configuration\n");
fprintf(fp, "daemon\n");
fprintf(fp, "topology subnet\n");
sprintf(&buffer[0], "/etc/openvpn/server%d/client.ovpn", serverNum);
fp_client = fopen(&buffer[0], "w");
fprintf(fp_client, "client\n");
if ( cryptMode == TLS )
{
if ( ifType == TUN )
{
sprintf(&buffer[0], "vpn_server%d_sn", serverNum);
fprintf(fp, "server %s ", nvram_safe_get(&buffer[0]));
sprintf(&buffer[0], "vpn_server%d_nm", serverNum);
fprintf(fp, "%s\n", nvram_safe_get(&buffer[0]));
fprintf(fp_client, "dev tun\n");
}
else if ( ifType == TAP )
{
fprintf(fp, "server-bridge");
sprintf(&buffer[0], "vpn_server%d_dhcp", serverNum);
if ( nvram_get_int(&buffer[0]) == 0 )
{
fprintf(fp, " %s ", nvram_safe_get("lan_ipaddr"));
fprintf(fp, "%s ", nvram_safe_get("lan_netmask"));
sprintf(&buffer[0], "vpn_server%d_r1", serverNum);
fprintf(fp, "%s ", nvram_safe_get(&buffer[0]));
sprintf(&buffer[0], "vpn_server%d_r2", serverNum);
fprintf(fp, "%s", nvram_safe_get(&buffer[0]));
}
else
{
fprintf(fp, "\npush \"route 0.0.0.0 255.255.255.255 net_gateway\"");
}
fprintf(fp, "\n");
fprintf(fp_client, "dev tap\n");
fprintf(fp_client, "# Windows needs the TAP-Win32 adapter name\n");
fprintf(fp_client, "# from the Network Connections panel\n");
fprintf(fp_client, "# if you have more than one. On XP SP2,\n");
fprintf(fp_client, "# you may need to disable the firewall\n");
fprintf(fp_client, "# for the TAP adapter.\n");
fprintf(fp_client, ";dev-node MyTap\n");
}
}
else if ( cryptMode == SECRET )
{
fprintf(fp_client, "mode p2p\n");
if ( ifType == TUN )
{
sprintf(&buffer[0], "vpn_server%d_local", serverNum);
fprintf(fp, "ifconfig %s ", nvram_safe_get(&buffer[0]));
sprintf(&buffer[0], "vpn_server%d_remote", serverNum);
fprintf(fp, "%s\n", nvram_safe_get(&buffer[0]));
fprintf(fp_client, "dev tun\n");
sprintf(&buffer[0], "vpn_server%d_remote", serverNum);
fprintf(fp_client, "ifconfig %s ", nvram_safe_get(&buffer[0]));
sprintf(&buffer[0], "vpn_server%d_local", serverNum);
fprintf(fp_client, "%s\n", nvram_safe_get(&buffer[0]));
}
else if ( ifType == TAP )
{
fprintf(fp_client, "dev tap\n");
}
}
//protocol
sprintf(&buffer[0], "vpn_server%d_proto", serverNum);
fprintf(fp, "proto %s\n", nvram_safe_get(&buffer[0]));
if(!strcmp(nvram_safe_get(&buffer[0]), "udp"))
fprintf(fp_client, "proto %s\n", nvram_safe_get(&buffer[0]));
else
fprintf(fp_client, "proto tcp-client\n");
//port
sprintf(&buffer[0], "vpn_server%d_port", serverNum);
fprintf(fp, "port %d\n", nvram_get_int(&buffer[0]));
// Don't explicitely set socket buffer size
sprintf(&buffer[0], "vpn_server%d_sockbuf", serverNum);
if (nvram_match(&buffer[0], "1")) {
fprintf(fp, "rcvbuf 0\nsndbuf 0\n");
}
if(nvram_get_int("ddns_enable_x"))
fprintf(fp_client, "remote %s %s\n", nvram_safe_get("ddns_hostname_x"), nvram_safe_get(&buffer[0]));
else
fprintf(fp_client, "remote %s %s\n", nvram_safe_get("wan0_ipaddr"), nvram_safe_get(&buffer[0]));
fprintf(fp_client, "float\n");
//cipher
fprintf(fp, "dev %s\n", &iface[0]);
sprintf(&buffer[0], "vpn_server%d_cipher", serverNum);
if ( !nvram_contains_word(&buffer[0], "default") ) {
fprintf(fp, "cipher %s\n", nvram_safe_get(&buffer[0]));
fprintf(fp_client, "cipher %s\n", nvram_safe_get(&buffer[0]));
}
//compression
sprintf(&buffer[0], "vpn_server%d_comp", serverNum);
if ( nvram_get_int(&buffer[0]) >= 0 ) {
fprintf(fp, "comp-lzo %s\n", nvram_safe_get(&buffer[0]));
fprintf(fp_client, "comp-lzo %s\n", nvram_safe_get(&buffer[0]));
}
fprintf(fp, "keepalive 15 60\n");
fprintf(fp_client, "keepalive 15 60\n");
if ( (nvi = nvram_get_int("vpn_loglevel")) >= 0 )
fprintf(fp, "verb %d\n", nvi);
else
fprintf(fp, "verb 3\n");
if ( cryptMode == TLS )
{
//TLS Renegotiation Time
sprintf(&buffer[0], "vpn_server%d_reneg", serverNum);
if ( (nvl = atol(nvram_safe_get(&buffer[0]))) >= 0 ) {
fprintf(fp, "reneg-sec %ld\n", nvl);
fprintf(fp_client, "reneg-sec %ld\n", nvl);
}
sprintf(&buffer[0], "vpn_server%d_plan", serverNum);
if ( ifType == TUN && nvram_get_int(&buffer[0]) )
{
sscanf(nvram_safe_get("lan_ipaddr"), "%d.%d.%d.%d", &ip[0], &ip[1], &ip[2], &ip[3]);
sscanf(nvram_safe_get("lan_netmask"), "%d.%d.%d.%d", &nm[0], &nm[1], &nm[2], &nm[3]);
fprintf(fp, "push \"route %d.%d.%d.%d %s\"\n", ip[0]&nm[0], ip[1]&nm[1], ip[2]&nm[2], ip[3]&nm[3],
nvram_safe_get("lan_netmask"));
}
sprintf(&buffer[0], "vpn_server%d_ccd", serverNum);
if ( nvram_get_int(&buffer[0]) )
{
fprintf(fp, "client-config-dir ccd\n");
sprintf(&buffer[0], "vpn_server%d_c2c", serverNum);
if ( (c2c = nvram_get_int(&buffer[0])) )
fprintf(fp, "client-to-client\n");
sprintf(&buffer[0], "vpn_server%d_ccd_excl", serverNum);
if ( nvram_get_int(&buffer[0]) )
fprintf(fp, "ccd-exclusive\n");
else
fprintf(fp, "duplicate-cn\n");
sprintf(&buffer[0], "/etc/openvpn/server%d/ccd", serverNum);
mkdir(&buffer[0], 0700);
chdir(&buffer[0]);
sprintf(&buffer[0], "vpn_server%d_ccd_val", serverNum);
strcpy(&buffer[0], nvram_safe_get(&buffer[0]));
chp = strtok(&buffer[0],"<");
while ( chp != NULL )
{
nvi = strlen(chp);
chp[strcspn(chp,">")] = '\0';
vpnlog(VPN_LOG_EXTRA,"CCD: enabled: %d", atoi(chp));
if ( atoi(chp) == 1 )
{
nvi -= strlen(chp)+1;
chp += strlen(chp)+1;
ccd = NULL;
route = NULL;
if ( nvi > 0 )
{
chp[strcspn(chp,">")] = '\0';
vpnlog(VPN_LOG_EXTRA,"CCD: Common name: %s", chp);
ccd = fopen(chp, "w");
chmod(chp, S_IRUSR|S_IWUSR);
nvi -= strlen(chp)+1;
chp += strlen(chp)+1;
}
if ( nvi > 0 && ccd != NULL && strcspn(chp,">") != strlen(chp) )
{
chp[strcspn(chp,">")] = ' ';
chp[strcspn(chp,">")] = '\0';
route = chp;
vpnlog(VPN_LOG_EXTRA,"CCD: Route: %s", chp);
if ( strlen(route) > 1 )
{
fprintf(ccd, "iroute %s\n", route);
fprintf(fp, "route %s\n", route);
}
nvi -= strlen(chp)+1;
chp += strlen(chp)+1;
}
if ( ccd != NULL )
fclose(ccd);
if ( nvi > 0 && route != NULL )
{
chp[strcspn(chp,">")] = '\0';
vpnlog(VPN_LOG_EXTRA,"CCD: Push: %d", atoi(chp));
if ( c2c && atoi(chp) == 1 && strlen(route) > 1 )
fprintf(fp, "push \"route %s\"\n", route);
nvi -= strlen(chp)+1;
chp += strlen(chp)+1;
}
vpnlog(VPN_LOG_EXTRA,"CCD leftover: %d", nvi+1);
}
// Advance to next entry
chp = strtok(NULL, "<");
}
// Copy any user-configured client config files
sprintf(&buffer[0], "/jffs/configs/openvpn/ccd%d", serverNum);
if(check_if_dir_exist(&buffer[0]))
{
vpnlog(VPN_LOG_EXTRA,"CCD - copying user files");
sprintf(buffer2, "cp %s/* .", &buffer[0]); /* */
system(buffer2);
}
vpnlog(VPN_LOG_EXTRA,"CCD processing complete");
}
else
fprintf(fp, "duplicate-cn\n");
sprintf(&buffer[0], "vpn_server%d_pdns", serverNum);
if ( nvram_get_int(&buffer[0]) )
{
if ( nvram_safe_get("wan_domain")[0] != '\0' )
fprintf(fp, "push \"dhcp-option DOMAIN %s\"\n", nvram_safe_get("wan_domain"));
fprintf(fp, "push \"dhcp-option DNS %s\"\n", nvram_safe_get("lan_ipaddr"));
}
sprintf(&buffer[0], "vpn_server%d_rgw", serverNum);
if ( nvram_get_int(&buffer[0]) )
{
if ( ifType == TAP )
fprintf(fp, "push \"route-gateway %s\"\n", nvram_safe_get("lan_ipaddr"));
fprintf(fp, "push \"redirect-gateway def1\"\n");
}
sprintf(&buffer[0], "vpn_server%d_hmac", serverNum);
nvi = nvram_get_int(&buffer[0]);
//sprintf(&buffer[0], "vpn_crt_server%d_static", serverNum);
//if ( !nvram_is_empty(&buffer[0]) && nvi >= 0 )
if ( nvi >= 0 )
{
fprintf(fp, "tls-auth static.key");
if ( nvi < 2 )
fprintf(fp, " %d", nvi);
fprintf(fp, "\n");
}
// Enable username/pass authentication (for Asus's PAM support)
sprintf(&buffer[0], "vpn_server%d_userpass_auth", serverNum);
userauth = nvram_get_int(&buffer[0]);
sprintf(&buffer[0], "vpn_server%d_igncrt", serverNum);
useronly = userauth && nvram_get_int(&buffer[0]);
if ( userauth ) {
//authentication
fprintf(fp, "plugin /usr/lib/openvpn-plugin-auth-pam.so openvpn\n");
fprintf(fp_client, "auth-user-pass\n");
//ignore client certificate, but only if user/pass auth is enabled
//That way, existing configuration (pre-Asus OVPN)
//will remain unchanged.
if ( useronly ) {