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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
Portions Copyright (C) 2012-2019 Eric Sauvageau
No part of this file may be used without permission.
*/
#include <rc.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <sys/stat.h>
#include <dirent.h>
#include <string.h>
#include <time.h>
#include <openvpn_config.h>
#include <openvpn_control.h>
#include <openssl/ssl.h>
#include <openssl/bio.h>
#include <openssl/pem.h>
#include <openssl/x509.h>
#include <openssl/x509_vfy.h>
extern struct nvram_tuple router_defaults[];
#define PUSH_LAN_METRIC 500
static int ovpn_waitfor(const char *name)
{
int pid, n = 5;
killall_tk_period_wait(name, 10); //wait time in seconds
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_ovpn_client(int clientNum)
{
FILE *fp;
char iface[6];
char buffer[256];
char buffer2[8000];
char *argv[6];
int argc = 0;
enum { TLS, SECRET } cryptMode = TLS;
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;
char cpulist[2];
int taskset_ret;
int i;
char prefix[16];
snprintf(prefix, sizeof(prefix), "vpn_client%d_", clientNum);
sprintf(buffer, "start_vpnclient%d", clientNum);
if (getpid() != 1) {
notify_rc(buffer);
return;
}
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;
}
nvram_pf_set(prefix, "state", "1"); // Initializing
nvram_pf_set(prefix, "errno", "0");
nvram_pf_set(prefix, "rip", "");
// Determine interface
strlcpy(buffer, nvram_pf_safe_get(prefix, "if"), sizeof (buffer));
if ( !strcmp(buffer, "tap") )
ifType = TAP;
else if ( !strcmp(buffer, "tun") )
ifType = TUN;
else
{
vpnlog(VPN_LOG_ERROR, "Invalid interface type, %.3s", buffer);
return;
}
// Build interface name
snprintf(iface, sizeof (iface), "%s%d", buffer, clientNum+OVPN_CLIENT_BASEIF);
// Determine encryption mode
strlcpy(buffer, nvram_pf_safe_get(prefix, "crypt"), sizeof(buffer) );
if ( !strcmp(buffer, "tls") )
cryptMode = TLS;
else if ( !strcmp(buffer, "secret") )
cryptMode = SECRET;
else
{
vpnlog(VPN_LOG_ERROR,"Invalid encryption mode, %.6s", buffer);
return;
}
// Determine if we should bridge the tunnel
if ( ifType == TAP && nvram_pf_get_int(prefix, "bridge") == 1 )
routeMode = BRIDGE;
// Determine if we should NAT the tunnel
if ( (ifType == TUN || routeMode != BRIDGE) && nvram_pf_get_int(prefix, "nat") == 1 )
routeMode = NAT;
// Make sure openvpn directory exists
mkdir("/etc/openvpn", 0700);
sprintf(buffer, "/etc/openvpn/client%d", clientNum);
mkdir(buffer, 0700);
// Make sure symbolic link exists
sprintf(buffer, "/etc/openvpn/vpnclient%d", clientNum);
unlink(buffer);
if ( symlink("/usr/sbin/openvpn", buffer) )
{
vpnlog(VPN_LOG_ERROR,"Creating symlink failed...");
stop_ovpn_client(clientNum);
return;
}
// Make sure module is loaded
modprobe("tun");
f_wait_exists("/dev/net/tun", 5);
// Create tap/tun interface
sprintf(buffer, "openvpn --mktun --dev %s", iface);
for (argv[argc=0] = strtok(buffer, " "); argv[argc] != NULL; argv[++argc] = strtok(NULL, " "));
if ( _eval(argv, NULL, 0, NULL) )
{
vpnlog(VPN_LOG_ERROR,"Creating tunnel interface %s failed...",iface);
stop_ovpn_client(clientNum);
return;
}
// Bring interface up (TAP only)
if( ifType == TAP )
{
if ( routeMode == BRIDGE )
{
snprintf(buffer, sizeof (buffer), "brctl addif %s %s", nvram_safe_get("lan_ifname"), iface);
for (argv[argc=0] = strtok(buffer, " "); argv[argc] != NULL; argv[++argc] = strtok(NULL, " "));
if ( _eval(argv, NULL, 0, NULL) )
{
vpnlog(VPN_LOG_ERROR,"Adding tunnel interface to bridge failed...");
stop_ovpn_client(clientNum);
return;
}
}
snprintf(buffer, sizeof (buffer), "ifconfig %s promisc up", iface);
for (argv[argc=0] = strtok(buffer, " "); argv[argc] != NULL; argv[++argc] = strtok(NULL, " "));
if ( _eval(argv, NULL, 0, NULL) )
{
vpnlog(VPN_LOG_ERROR,"Bringing interface up failed...");
stop_ovpn_client(clientNum);
return;
}
}
userauth = nvram_pf_get_int(prefix, "userauth");
useronly = userauth && nvram_pf_get_int(prefix, "useronly");
// Build and write config file
vpnlog(VPN_LOG_EXTRA,"Writing config file");
sprintf(buffer, "/etc/openvpn/client%d/config.ovpn", clientNum);
fp = fopen(buffer, "w");
chmod(buffer, S_IRUSR|S_IWUSR);
fprintf(fp, "# Automatically generated configuration\n");
fprintf(fp, "daemon ovpn-client%d\n", clientNum);
if ( cryptMode == TLS )
fprintf(fp, "client\n");
fprintf(fp, "dev %s\n", iface);
fprintf(fp, "txqueuelen 1000\n");
fprintf(fp, "proto %s\n", nvram_pf_safe_get(prefix, "proto"));
fprintf(fp, "remote %s ", nvram_pf_safe_get(prefix, "addr"));
fprintf(fp, "%d\n", nvram_pf_get_int(prefix, "port"));
if ( cryptMode == SECRET )
{
if ( ifType == TUN )
{
fprintf(fp, "ifconfig %s ", nvram_pf_safe_get(prefix, "local"));
fprintf(fp, "%s\n", nvram_pf_safe_get(prefix, "remote"));
}
else if ( ifType == TAP )
{
fprintf(fp, "ifconfig %s ", nvram_pf_safe_get(prefix, "local"));
fprintf(fp, "%s\n", nvram_pf_safe_get(prefix, "nm"));
}
}
if ( (nvi = nvram_pf_get_int(prefix, "connretry")) >= 0 )
fprintf(fp, "connect-retry-max %d\n", nvi);
fprintf(fp, "nobind\n");
fprintf(fp, "persist-key\n");
fprintf(fp, "persist-tun\n");
strlcpy(buffer2, nvram_pf_safe_get(prefix, "comp"), sizeof (buffer2));
if (strcmp(buffer2, "-1")) {
if (!strcmp(buffer2, "lz4") || !strcmp(buffer2, "lz4-v2")) {
fprintf(fp, "compress %s\n", buffer2);
} else if (!strcmp(buffer2, "yes")) {
fprintf(fp, "compress lzo\n");
} else if (!strcmp(buffer2, "adaptive")) {
fprintf(fp, "comp-lzo adaptive\n");
} else if (!strcmp(buffer2, "no")) {
fprintf(fp, "compress\n"); // Disable, but can be overriden
}
}
if ( cryptMode == TLS ) {
nvi = nvram_pf_get_int(prefix, "ncp_enable");
strlcpy(buffer2, nvram_pf_safe_get(prefix, "ncp_ciphers"), sizeof (buffer2));
if ((nvi > 0) && (buffer2[0] != '\0')) {
fprintf(fp, "ncp-ciphers %s\n", buffer2);
} else {
nvi = 0;
fprintf(fp, "ncp-disable\n");
}
} else {
nvi = 0;
}
if (nvi != 2) {
strlcpy(buffer, nvram_pf_safe_get(prefix, "cipher"), sizeof(buffer));
if ( strcmp(buffer,"default") )
fprintf(fp, "cipher %s\n", buffer);
}
strlcpy(buffer, nvram_pf_safe_get(prefix, "digest"), sizeof(buffer));
if ( strcmp(buffer, "default"))
fprintf(fp, "auth %s\n", buffer);
nvi = nvram_pf_get_int(prefix, "rgw");
if (nvi == OVPN_RGW_ALL) {
if ( ifType == TAP && nvram_pf_safe_get(prefix, "gw")[0] != '\0' )
fprintf(fp, "route-gateway %s\n", nvram_pf_safe_get(prefix, "gw"));
fprintf(fp, "redirect-gateway def1\n");
} else if (nvi == OVPN_RGW_POLICY_STRICT) {
fprintf(fp, "route-noexec\n");
}
// For selective routing
sprintf(buffer, "/etc/openvpn/client%d/vpnrouting.sh", clientNum);
symlink("/usr/sbin/vpnrouting.sh", buffer);
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");
fprintf(fp, "verb %d\n", nvram_pf_get_int(prefix, "verb"));
if ( cryptMode == TLS )
{
if ( (nvl = atol(nvram_pf_safe_get(prefix, "reneg"))) >= 0 )
fprintf(fp, "reneg-sec %ld\n", nvl);
nvi = nvram_pf_get_int(prefix, "hmac");
if (ovpn_key_exists(OVPN_TYPE_CLIENT, clientNum, OVPN_CLIENT_STATIC) && (nvi >= 0))
{
if (nvi == 3)
fprintf(fp, "tls-crypt static.key");
else
fprintf(fp, "tls-auth static.key");
if ( nvi < 2 )
fprintf(fp, " %d", nvi);
fprintf(fp, "\n");
}
if (ovpn_key_exists(OVPN_TYPE_CLIENT, clientNum, OVPN_CLIENT_CA))
fprintf(fp, "ca ca.crt\n");
if (!useronly)
{
if (ovpn_key_exists(OVPN_TYPE_CLIENT, clientNum, OVPN_CLIENT_CERT))
fprintf(fp, "cert client.crt\n");
if (ovpn_key_exists(OVPN_TYPE_CLIENT, clientNum, OVPN_CLIENT_KEY))
fprintf(fp, "key client.key\n");
}
if (nvram_pf_get_int(prefix, "tlsremote"))
{
fprintf(fp, "verify-x509-name \"%s\" name\n", nvram_pf_safe_get(prefix, "cn"));
}
if (userauth)
fprintf(fp, "auth-user-pass up\n");
if (ovpn_key_exists(OVPN_TYPE_CLIENT, clientNum, OVPN_CLIENT_CRL))
fprintf(fp, "crl-verify crl.pem\n");
if (ovpn_key_exists(OVPN_TYPE_CLIENT, clientNum, OVPN_CLIENT_CA_EXTRA))
fprintf(fp, "extra-certs extra.pem\n");
}
else if ( cryptMode == SECRET )
{
if (ovpn_key_exists(OVPN_TYPE_CLIENT, clientNum, OVPN_CLIENT_STATIC))
fprintf(fp, "secret static.key\n");
}
sprintf(buffer, "/etc/openvpn/client%d/updown.sh", clientNum);
symlink("/usr/sbin/updown-client.sh", buffer);
fprintf(fp, "up updown.sh\n");
fprintf(fp, "down updown.sh\n");
fprintf(fp, "status-version 2\n");
fprintf(fp, "status status 5\n");
fprintf(fp, "\n# Custom Configuration\n");
fprintf(fp, "%s", get_ovpn_custom(OVPN_TYPE_CLIENT, clientNum, buffer2, sizeof (buffer2) ));
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 )
{
if (ovpn_key_exists(OVPN_TYPE_CLIENT, clientNum, OVPN_CLIENT_CA))
{
sprintf(buffer, "/etc/openvpn/client%d/ca.crt", clientNum);
fp = fopen(buffer, "w");
chmod(buffer, S_IRUSR|S_IWUSR);
fprintf(fp, "%s", get_ovpn_key(OVPN_TYPE_CLIENT, clientNum, OVPN_CLIENT_CA, buffer2, sizeof(buffer2)));
fclose(fp);
}
if (!useronly)
{
if (ovpn_key_exists(OVPN_TYPE_CLIENT, clientNum, OVPN_CLIENT_KEY))
{
sprintf(buffer, "/etc/openvpn/client%d/client.key", clientNum);
fp = fopen(buffer, "w");
chmod(buffer, S_IRUSR|S_IWUSR);
fprintf(fp, "%s", get_ovpn_key(OVPN_TYPE_CLIENT, clientNum, OVPN_CLIENT_KEY, buffer2, sizeof(buffer2)));
fclose(fp);
}
if (ovpn_key_exists(OVPN_TYPE_CLIENT, clientNum, OVPN_CLIENT_CERT))
{
sprintf(buffer, "/etc/openvpn/client%d/client.crt", clientNum);
fp = fopen(buffer, "w");
chmod(buffer, S_IRUSR|S_IWUSR);
fprintf(fp, "%s", get_ovpn_key(OVPN_TYPE_CLIENT, clientNum, OVPN_CLIENT_CERT, buffer2, sizeof(buffer2)));
fclose(fp);
}
}
if (userauth)
{
sprintf(buffer, "/etc/openvpn/client%d/up", clientNum);
fp = fopen(buffer, "w");
chmod(buffer, S_IRUSR|S_IWUSR);
fprintf(fp, "%s\n", nvram_pf_safe_get(prefix, "username"));
fprintf(fp, "%s\n", nvram_pf_safe_get(prefix, "password"));
fclose(fp);
}
if (ovpn_key_exists(OVPN_TYPE_CLIENT, clientNum, OVPN_CLIENT_CRL))
{
sprintf(buffer, "/etc/openvpn/client%d/crl.pem", clientNum);
fp = fopen(buffer, "w");
chmod(buffer, S_IRUSR|S_IWUSR);
fprintf(fp, "%s", get_ovpn_key(OVPN_TYPE_CLIENT, clientNum, OVPN_CLIENT_CRL, buffer2, sizeof(buffer2)));
fclose(fp);
}
if (ovpn_key_exists(OVPN_TYPE_CLIENT, clientNum, OVPN_CLIENT_CA_EXTRA))
{
sprintf(buffer, "/etc/openvpn/client%d/extra.pem", clientNum);
fp = fopen(buffer, "w");
chmod(buffer, S_IRUSR|S_IWUSR);
fprintf(fp, "%s", get_ovpn_key(OVPN_TYPE_CLIENT, clientNum, OVPN_CLIENT_CA_EXTRA, buffer2, sizeof(buffer2)));
fclose(fp);
}
}
if ( cryptMode == SECRET || (cryptMode == TLS && nvram_pf_get_int(prefix, "hmac") >= 0) )
{
if (ovpn_key_exists(OVPN_TYPE_CLIENT, clientNum, OVPN_CLIENT_STATIC))
{
sprintf(buffer, "/etc/openvpn/client%d/static.key", clientNum);
fp = fopen(buffer, "w");
chmod(buffer, S_IRUSR|S_IWUSR);
fprintf(fp, "%s", get_ovpn_key(OVPN_TYPE_CLIENT, clientNum, OVPN_CLIENT_STATIC, buffer2, sizeof(buffer2)));
fclose(fp);
}
}
vpnlog(VPN_LOG_EXTRA,"Done writing certs/keys");
// Create firewall rules
vpnlog(VPN_LOG_EXTRA,"Creating firewall rules");
mkdir("/etc/openvpn/fw", 0700);
sprintf(buffer, "/etc/openvpn/fw/client%d-fw.sh", clientNum);
fp = fopen(buffer, "w");
chmod(buffer, S_IRUSR|S_IWUSR|S_IXUSR);
fprintf(fp, "#!/bin/sh\n");
fprintf(fp, "iptables -I OVPN -i %s -j %s\n",
iface, (nvram_pf_get_int(prefix, "fw") ? "DROP" : "ACCEPT"));
#ifdef HND_ROUTER
if (nvram_match("fc_disable", "0")) {
#else
if (nvram_match("ctf_disable", "0")) {
#endif
fprintf(fp, "iptables -t mangle -I PREROUTING -i %s -j MARK --set-mark 0x01/0x7\n", iface);
}
#if !defined(HND_ROUTER)
// Setup traffic accounting
if (nvram_match("cstats_enable", "1")) {
ipt_account(fp, iface);
}
#endif
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);
}
// Disable rp_filter when in policy mode - firewall restart would re-enable it
if (nvram_pf_get_int(prefix, "rgw") >= OVPN_RGW_POLICY) {
fprintf(fp, "for i in /proc/sys/net/ipv4/conf/*/rp_filter ; do\n"); /* */
fprintf(fp, "echo 0 > $i\n");
fprintf(fp, "done\n");
}
fclose(fp);
vpnlog(VPN_LOG_EXTRA,"Done creating firewall rules");
// Run postconf custom script on it if it exists
sprintf(buffer, "openvpnclient%d", clientNum);
sprintf(buffer2, "/etc/openvpn/client%d/config.ovpn", clientNum);
run_postconf(buffer, buffer2);
// Run the firewall rules
vpnlog(VPN_LOG_EXTRA,"Running firewall rules");
sprintf(buffer, "/etc/openvpn/fw/client%d-fw.sh", clientNum);
argv[0] = buffer;
argv[1] = NULL;
_eval(argv, NULL, 0, NULL);
vpnlog(VPN_LOG_EXTRA,"Done running firewall rules");
// Start the VPN client
sprintf(buffer, "/etc/openvpn/vpnclient%d", clientNum);
sprintf(buffer2, "/etc/openvpn/client%d", clientNum);
// Spread clients on cpu 1,0 or 1,2,3,0 (in that order)
i = sysconf(_SC_NPROCESSORS_CONF) - 1;
if (i < 0) i = 0;
snprintf(cpulist, sizeof(cpulist), "%d", (clientNum & i));
taskset_ret = cpu_eval(NULL, cpulist, buffer, "--cd", buffer2, "--config", "config.ovpn");
vpnlog(VPN_LOG_INFO,"Starting OpenVPN client %d", clientNum);
if (taskset_ret)
{
vpnlog(VPN_LOG_ERROR,"Starting OpenVPN failed...");
stop_ovpn_client(clientNum);
return;
}
vpnlog(VPN_LOG_EXTRA,"Done starting openvpn");
#if 0
// watchdog
sprintf(buffer, "/etc/openvpn/client%d/vpnc-watchdog%d.sh", clientNum, clientNum);
if ((fp = fopen(buffer, "w"))) {
char taskname[20];
chmod(buffer, S_IRUSR|S_IWUSR|S_IXUSR);
fprintf(fp, "#!/bin/sh\n"
"if [ -z $(pidof vpnclient%d) ]\n"
"then\n"
" service restart_vpnclient%d\n"
"fi\n",
clientNum, clientNum);
fclose(fp);
argv[0] = "cru";
argv[1] = "a";
sprintf(taskname, "CheckVPNClient%d", clientNum);
argv[2] = taskname;
sprintf(buffer2, "*/2 * * * * %s", buffer);
argv[3] = buffer2;
argv[4] = NULL;
_eval(argv, NULL, 0, NULL);
vpnlog(VPN_LOG_EXTRA,"Done adding cron job");
}
#endif
vpnlog(VPN_LOG_INFO,"VPN GUI client backend complete.");
}
void stop_ovpn_client(int clientNum)
{
int argc;
char *argv[7];
char buffer[256];
sprintf(buffer, "stop_vpnclient%d", clientNum);
if (getpid() != 1) {
notify_rc(buffer);
return;
}
vpnlog(VPN_LOG_INFO,"Stopping VPN GUI client backend.");
#if 0
// Remove cron job
vpnlog(VPN_LOG_EXTRA,"Removing cron job");
argv[0] = "cru";
argv[1] = "d";
sprintf(buffer, "CheckVPNClient%d", clientNum);
argv[2] = buffer;
argv[3] = NULL;
_eval(argv, NULL, 0, NULL);
vpnlog(VPN_LOG_EXTRA,"Done removing cron job");
#endif
// Stop the VPN client
vpnlog(VPN_LOG_EXTRA,"Stopping OpenVPN client.");
sprintf(buffer, "vpnclient%d", clientNum);
if ( !ovpn_waitfor(buffer) )
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, "openvpn --rmtun --dev tap%d", clientNum+OVPN_CLIENT_BASEIF);
for (argv[argc=0] = strtok(buffer, " "); argv[argc] != NULL; argv[++argc] = strtok(NULL, " "));
_eval(argv, NULL, 0, NULL);
sprintf(buffer, "openvpn --rmtun --dev tun%d", clientNum+OVPN_CLIENT_BASEIF);
for (argv[argc=0] = strtok(buffer, " "); argv[argc] != NULL; argv[++argc] = strtok(NULL, " "));
_eval(argv, NULL, 0, NULL);
vpnlog(VPN_LOG_EXTRA,"VPN device removed.");
// Remove firewall rules after VPN exit
vpnlog(VPN_LOG_EXTRA,"Removing firewall rules.");
sprintf(buffer, "/etc/openvpn/fw/client%d-fw.sh", clientNum);
argv[0] = "sed";
argv[1] = "-i";
argv[2] = "s/-A/-D/g;s/-I/-D/g";
argv[3] = buffer;
argv[4] = NULL;
if (!_eval(argv, NULL, 0, NULL))
{
argv[0] = buffer;
argv[1] = NULL;
_eval(argv, NULL, 0, NULL);
}
vpnlog(VPN_LOG_EXTRA,"Done removing firewall rules.");
if ( nvram_get_int("vpn_debug") <= VPN_LOG_EXTRA )
{
vpnlog(VPN_LOG_EXTRA,"Removing generated files.");
// Delete all files for this client
sprintf(buffer, "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, " "); 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.");
}
snprintf(buffer, sizeof (buffer), "vpn_client%d_", clientNum);
nvram_pf_set(buffer, "state","0");
nvram_pf_set(buffer, "errno", "0");
nvram_pf_set(buffer, "rip", "");
update_resolvconf();
vpnlog(VPN_LOG_INFO,"VPN GUI client backend stopped.");
}
void start_ovpn_server(int serverNum)
{
FILE *fp, *ccd, *fp_client;;
char iface[6];
char buffer[256];
char buffer2[8000];
char *argv[6], *chp, *route;
int argc = 0;
int c2c = 0;
enum { TAP, TUN } ifType = TUN;
enum { TLS, SECRET } cryptMode = TLS;
int nvi, ip[4], nm[4];
int pid;
char cpulist[2];
int taskset_ret;
int valid = 0;
int userauth = 0, useronly = 0;
int i, len;
char prefix[16];
DH *dhparams = NULL;
snprintf(prefix, sizeof (prefix), "vpn_server%d_", serverNum);
sprintf(buffer, "start_vpnserver%d", serverNum);
if (getpid() != 1) {
notify_rc(buffer);
return;
}
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;
}
nvram_pf_set(prefix, "state", "1"); //initializing
nvram_pf_set(prefix, "errno", "0");
// Determine interface type
strlcpy(buffer, nvram_pf_safe_get(prefix, "if"), sizeof (buffer) );
if ( !strcmp(buffer, "tap") )
ifType = TAP;
else if ( !strcmp(buffer, "tun") )
ifType = TUN;
else
{
vpnlog(VPN_LOG_ERROR,"Invalid interface type, %.3s", buffer);
return;
}
// Build interface name
snprintf(iface, sizeof (iface), "%s%d", buffer, serverNum+OVPN_SERVER_BASEIF);
if(is_intf_up(iface) > 0 && ifType == TAP) {
eval("brctl", "delif", nvram_safe_get("lan_ifname"), iface);
}
// Determine encryption mode
strlcpy(buffer, nvram_pf_safe_get(prefix, "crypt"), sizeof (buffer) );
if ( !strcmp(buffer, "tls") )
cryptMode = TLS;
else if ( !strcmp(buffer, "secret") )
cryptMode = SECRET;
else
{
vpnlog(VPN_LOG_ERROR,"Invalid encryption mode, %.6s", buffer);
return;
}
// Make sure openvpn directory exists
mkdir("/etc/openvpn", 0700);
sprintf(buffer, "/etc/openvpn/server%d", serverNum);
mkdir(buffer, 0700);
// Make sure symbolic link exists
sprintf(buffer, "/etc/openvpn/vpnserver%d", serverNum);
unlink(buffer);
if ( symlink("/usr/sbin/openvpn", buffer) )
{
vpnlog(VPN_LOG_ERROR,"Creating symlink failed...");
stop_ovpn_server(serverNum);
return;
}
// Make sure module is loaded
modprobe("tun");
f_wait_exists("/dev/net/tun", 5);
// Create tap/tun interface
sprintf(buffer, "openvpn --mktun --dev %s", iface);
for (argv[argc=0] = strtok(buffer, " "); argv[argc] != NULL; argv[++argc] = strtok(NULL, " "));
if ( _eval(argv, NULL, 0, NULL) )
{
vpnlog(VPN_LOG_ERROR,"Creating tunnel interface %s failed...",iface);
stop_ovpn_server(serverNum);
return;
}
// Add interface to LAN bridge (TAP only)
if( ifType == TAP )
{
snprintf(buffer, sizeof (buffer), "brctl addif %s %s", nvram_safe_get("lan_ifname"), iface);
for (argv[argc=0] = strtok(buffer, " "); argv[argc] != NULL; argv[++argc] = strtok(NULL, " "));
if ( _eval(argv, NULL, 0, NULL) )
{
vpnlog(VPN_LOG_ERROR,"Adding tunnel interface to bridge failed...");
stop_ovpn_server(serverNum);
return;
}
}
// Bring interface up
sprintf(buffer, "ifconfig %s 0.0.0.0 promisc up", iface);
for (argv[argc=0] = strtok(buffer, " "); argv[argc] != NULL; argv[++argc] = strtok(NULL, " "));
if ( _eval(argv, NULL, 0, NULL) )
{
vpnlog(VPN_LOG_ERROR,"Bringing up tunnel interface failed...");
stop_ovpn_server(serverNum);
return;
}
// Build and write config files
vpnlog(VPN_LOG_EXTRA,"Writing config file");
sprintf(buffer, "/etc/openvpn/server%d/config.ovpn", serverNum);
fp = fopen(buffer, "w");
chmod(buffer, S_IRUSR|S_IWUSR);
fprintf(fp, "# Automatically generated configuration\n");
fprintf(fp, "daemon ovpn-server%d\n", serverNum);
sprintf(buffer, "/etc/openvpn/server%d/client.ovpn", serverNum);
fp_client = fopen(buffer, "w");
if ( cryptMode == TLS )
{
fprintf(fp_client, "client\n");
if ( ifType == TUN )
{
fprintf(fp, "topology subnet\n");
fprintf(fp, "server %s ", nvram_pf_safe_get(prefix, "sn"));
fprintf(fp, "%s\n", nvram_pf_safe_get(prefix, "nm"));
fprintf(fp_client, "dev tun\n");
}
else if ( ifType == TAP )
{
fprintf(fp, "server-bridge");
if ( nvram_pf_get_int(prefix, "dhcp") == 0 )
{
fprintf(fp, " %s ", nvram_safe_get("lan_ipaddr"));
fprintf(fp, "%s ", nvram_safe_get("lan_netmask"));
fprintf(fp, "%s ", nvram_pf_safe_get(prefix, "r1"));
fprintf(fp, "%s", nvram_pf_safe_get(prefix, "r2"));
}
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.\n");
fprintf(fp_client, ";dev-node MyTap\n");
}
}
else if ( cryptMode == SECRET )
{
fprintf(fp_client, "mode p2p\n");
if ( ifType == TUN )
{
fprintf(fp, "ifconfig %s ", nvram_pf_safe_get(prefix, "local"));
fprintf(fp, "%s\n", nvram_pf_safe_get(prefix, "remote"));
fprintf(fp_client, "dev tun\n");
fprintf(fp_client, "ifconfig %s ", nvram_pf_safe_get(prefix, "remote"));
fprintf(fp_client, "%s\n", nvram_pf_safe_get(prefix, "local"));
}
else if ( ifType == TAP )
{
fprintf(fp_client, "dev tap\n");
}
}
//protocol
strlcpy(buffer, nvram_pf_safe_get(prefix, "proto"), sizeof (buffer));
fprintf(fp, "proto %s\n", buffer);
if(!strcmp(buffer, "udp"))
fprintf(fp_client, "proto %s\n", buffer);
else
fprintf(fp_client, "proto tcp-client\n");
//port
nvi = nvram_pf_get_int(prefix, "port");
fprintf(fp, "port %d\n", nvi);
//Remote address
fprintf(fp_client, "remote %s %d\n", get_ovpn_remote_address(buffer, sizeof(buffer)), nvi);
fprintf(fp_client, "float\n");
fprintf(fp, "dev %s\n", iface);
fprintf(fp, "txqueuelen 1000\n");
//cipher
if ( cryptMode == TLS ) {
nvi = nvram_pf_get_int(prefix, "ncp_enable");
strlcpy(buffer2, nvram_pf_safe_get(prefix, "ncp_ciphers"), sizeof (buffer2));
if ((nvi > 0) && (buffer2[0] != '\0')) {
fprintf(fp, "ncp-ciphers %s\n", buffer2);
fprintf(fp_client, "ncp-ciphers %s\n", buffer2);
} else {
nvi = 0;
fprintf(fp, "ncp-disable\n");
}
} else {
nvi = 0;
}
if (nvi != 2) {
strlcpy(buffer, nvram_pf_safe_get(prefix, "cipher"), sizeof (buffer));
if ( strcmp(buffer, "default") ) {
fprintf(fp, "cipher %s\n", buffer);
fprintf(fp_client, "cipher %s\n", buffer);
}
}
//digest
strlcpy(buffer, nvram_pf_safe_get(prefix, "digest"), sizeof (buffer));
if ( strcmp(buffer, "default") ) {
fprintf(fp, "auth %s\n", buffer);
fprintf(fp_client, "auth %s\n", buffer);
}
//compression
strlcpy(buffer, nvram_pf_safe_get(prefix, "comp"), sizeof (buffer));
if (strcmp(buffer, "-1")) {
if (!strcmp(buffer, "lz4") || !strcmp(buffer, "lz4-v2")) {
fprintf(fp, "compress %s\n", buffer);
fprintf(fp_client, "compress %s\n", buffer);
} else if (!strcmp(buffer, "yes")) {
fprintf(fp, "compress lzo\n");
fprintf(fp_client, "comp-lzo yes\n");
} else if (!strcmp(buffer, "adaptive")) {
fprintf(fp, "comp-lzo adaptive\n");
fprintf(fp_client, "comp-lzo adaptive\n");
} else if (!strcmp(buffer, "no")) {
fprintf(fp, "compress\n"); // Disable, but client can override if desired
fprintf(fp_client, "comp-lzo no\n");
}
}
fprintf(fp, "keepalive 15 60\n");
fprintf(fp_client, "keepalive 15 60\n");
fprintf(fp, "verb %d\n", nvram_pf_get_int(prefix, "verb"));
if ( cryptMode == TLS )
{
if ( (ifType == TUN) && (nvram_pf_get_int(prefix, "client_access") != OVPN_CLT_ACCESS_WAN) )
{
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 vpn_gateway %d\"\n",
ip[0]&nm[0], ip[1]&nm[1], ip[2]&nm[2], ip[3]&nm[3],
nvram_safe_get("lan_netmask"), PUSH_LAN_METRIC);
}
if ( nvram_pf_get_int(prefix, "ccd") )
{
fprintf(fp, "client-config-dir ccd\n");
if ( (c2c = nvram_pf_get_int(prefix, "c2c")) )
fprintf(fp, "client-to-client\n");
if ( nvram_pf_get_int(prefix, "ccd_excl") )
fprintf(fp, "ccd-exclusive\n");
else
fprintf(fp, "duplicate-cn\n");
sprintf(buffer, "/etc/openvpn/server%d/ccd", serverNum);
mkdir(buffer, 0700);
chdir(buffer);
strcpy(buffer, nvram_pf_safe_get(prefix, "ccd_val"));
chp = strtok(buffer,"<");
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, "/jffs/configs/openvpn/ccd%d", serverNum);
if(check_if_dir_exist(buffer))
{
vpnlog(VPN_LOG_EXTRA,"CCD - copying user files");
sprintf(buffer2, "cp %s/* .", buffer); /* */
system(buffer2);
}
vpnlog(VPN_LOG_EXTRA,"CCD processing complete");
}
else
fprintf(fp, "duplicate-cn\n");
if ( nvram_pf_get_int(prefix, "pdns") )
{
if ( nvram_safe_get("lan_domain")[0] != '\0' )
fprintf(fp, "push \"dhcp-option DOMAIN %s\"\n", nvram_safe_get("lan_domain"));
fprintf(fp, "push \"dhcp-option DNS %s\"\n", nvram_safe_get("lan_ipaddr"));
}
if ( nvram_pf_get_int(prefix, "client_access") != OVPN_CLT_ACCESS_LAN )
{
if ( ifType == TAP )
fprintf(fp, "push \"route-gateway %s\"\n", nvram_safe_get("lan_ipaddr"));
fprintf(fp, "push \"redirect-gateway def1\"\n");
}
nvi = nvram_pf_get_int(prefix, "hmac");
//if (ovpn_key_exists(OVPN_TYPE_SERVER, serverNum, OVPN_SERVER_STATIC))
if ( nvi >= 0 )
{
if (nvi == 3)
fprintf(fp, "tls-crypt static.key");
else
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)
userauth = nvram_pf_get_int(prefix, "userpass_auth");
useronly = userauth && nvram_pf_get_int(prefix, "igncrt");
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 ) {
fprintf(fp, "verify-client-cert none\n");
fprintf(fp, "username-as-common-name\n");
}
}
fprintf(fp_client, "remote-cert-tls server\n");
//if (ovpn_key_exists(OVPN_TYPE_SERVER, serverNum, OVPN_SERVER_CA))
fprintf(fp, "ca ca.crt\n");
if ( !strncmp( get_ovpn_key(OVPN_TYPE_SERVER, serverNum, OVPN_SERVER_DH, buffer2, sizeof(buffer2)), "none", 4))
fprintf(fp, "dh none\n");