#include <unistd.h>
#include <stdlib.h>
#include <sys/types.h>
+#include <arpa/inet.h>
+#include <netinet/in.h>
#include <fcntl.h>
#include "setuid.h"
+#include "netutil.h"
#include "libsmooth.h"
#define noovpndebug
char OVPNRED[STRING_SIZE] = "OVPN";
char OVPNBLUE[STRING_SIZE] = "OVPN_BLUE_";
char OVPNORANGE[STRING_SIZE] = "OVPN_ORANGE_";
-char WRAPPERVERSION[STRING_SIZE] = "ipfire-2.2.2";
+char OVPNBLOCK[STRING_SIZE] = "OVPNBLOCK";
+char OVPNNAT[STRING_SIZE] = "OVPNNAT";
+char WRAPPERVERSION[STRING_SIZE] = "ipfire-2.2.3";
struct connection_struct {
char name[STRING_SIZE];
char type[STRING_SIZE];
char proto[STRING_SIZE];
char status[STRING_SIZE];
+ char local_subnet[STRING_SIZE];
+ char transfer_subnet[STRING_SIZE];
+ char role[STRING_SIZE];
int port;
struct connection_struct *next;
};
strcpy(conn_curr->name, result);
} else if (count == 4) {
strcpy(conn_curr->type, result);
+ } else if (count == 7) {
+ strcpy(conn_curr->role, result);
+ } else if (count == 9) {
+ strcpy(conn_curr->local_subnet, result);
+ } else if (count == 28) {
+ strcpy(conn_curr->transfer_subnet, result);
} else if (count == 29) {
strcpy(conn_curr->proto, result);
} else if (count == 30) {
int readPidFile(const char *pidfile) {
FILE *fp = fopen(pidfile, "r");
if (fp == NULL) {
- fprintf(stderr, "PID file not found: '%s'\n", pidfile);
exit(1);
}
}
void ovpnInit(void) {
-
// Read OpenVPN configuration
kv = initkeyvalues();
if (!readkeyvalues(kv, CONFIG_ROOT "/ovpn/settings")) {
}
if (!findkey(kv, "ENABLED", enablered)) {
- fprintf(stderr, "Cannot read ENABLED\n");
exit(1);
}
if (!findkey(kv, "ENABLED_BLUE", enableblue)){
- fprintf(stderr, "Cannot read ENABLED_BLUE\n");
exit(1);
}
if (!findkey(kv, "ENABLED_ORANGE", enableorange)){
- fprintf(stderr, "Cannot read ENABLED_ORANGE\n");
exit(1);
}
freekeyvalues(kv);
}
kv=initkeyvalues();
- if (!readkeyvalues(kv, CONFIG_ROOT "/ethernet/settings"))
- {
+ if (!readkeyvalues(kv, CONFIG_ROOT "/ethernet/settings")) {
fprintf(stderr, "Cannot read ethernet settings\n");
exit(1);
}
- if (strcmp(enableblue, "on")==0){
- if (!findkey(kv, "BLUE_DEV", blueif)){
- fprintf(stderr, "Cannot read BLUE_DEV\n");
+ if (strcmp(enableblue, "on") == 0) {
+ if (!findkey(kv, "BLUE_DEV", blueif)) {
exit(1);
}
}
- if (strcmp(enableorange, "on")==0){
- if (!findkey(kv, "ORANGE_DEV", orangeif)){
- fprintf(stderr, "Cannot read ORNAGE_DEV\n");
+
+ if (strcmp(enableorange, "on") == 0) {
+ if (!findkey(kv, "ORANGE_DEV", orangeif)) {
exit(1);
}
- }
+ }
freekeyvalues(kv);
}
sprintf(str, "/sbin/iptables -A %sINPUT -i %s -p %s --dport %s -j ACCEPT", chain, interface, protocol, port);
executeCommand(str);
- sprintf(str, "/sbin/iptables -A %sINPUT -i tun+ -j ACCEPT", chain);
- executeCommand(str);
- sprintf(str, "/sbin/iptables -A %sFORWARD -i tun+ -j ACCEPT", chain);
- executeCommand(str);
}
void flushChain(char *chain) {
char str[STRING_SIZE];
- sprintf(str, "/sbin/iptables -F %sINPUT", chain);
+ sprintf(str, "/sbin/iptables -F %s", chain);
executeCommand(str);
- sprintf(str, "/sbin/iptables -F %sFORWARD", chain);
+}
+
+void flushChainNAT(char *chain) {
+ char str[STRING_SIZE];
+
+ sprintf(str, "/sbin/iptables -t nat -F %s", chain);
executeCommand(str);
- safe_system(str);
+}
+
+void flushChainINPUT(char *chain) {
+ char str[STRING_SIZE];
+
+ snprintf(str, STRING_SIZE, "%sINPUT", chain);
+ flushChain(str);
}
void deleteChainReference(char *chain) {
sprintf(str, "/sbin/iptables -D INPUT -j %sINPUT", chain);
executeCommand(str);
- safe_system(str);
- sprintf(str, "/sbin/iptables -D FORWARD -j %sFORWARD", chain);
- executeCommand(str);
- safe_system(str);
}
void deleteChain(char *chain) {
sprintf(str, "/sbin/iptables -X %sINPUT", chain);
executeCommand(str);
- sprintf(str, "/sbin/iptables -X %sFORWARD", chain);
- executeCommand(str);
}
void deleteAllChains(void) {
deleteChainReference(OVPNRED);
deleteChainReference(OVPNBLUE);
deleteChainReference(OVPNORANGE);
- flushChain(OVPNRED);
- flushChain(OVPNBLUE);
- flushChain(OVPNORANGE);
+ flushChainINPUT(OVPNRED);
+ flushChainINPUT(OVPNBLUE);
+ flushChainINPUT(OVPNORANGE);
deleteChain(OVPNRED);
deleteChain(OVPNBLUE);
deleteChain(OVPNORANGE);
+
+ // Only flush chains that are created by the firewall
+ flushChain(OVPNBLOCK);
+ flushChainNAT(OVPNNAT);
}
void createChainReference(char *chain) {
char str[STRING_SIZE];
sprintf(str, "/sbin/iptables -I INPUT %s -j %sINPUT", "14", chain);
executeCommand(str);
- sprintf(str, "/sbin/iptables -I FORWARD %s -j %sFORWARD", "12", chain);
- executeCommand(str);
}
void createChain(char *chain) {
char str[STRING_SIZE];
sprintf(str, "/sbin/iptables -N %sINPUT", chain);
executeCommand(str);
- sprintf(str, "/sbin/iptables -N %sFORWARD", chain);
- executeCommand(str);
}
void createAllChains(void) {
// create chain and chain references
if (!strcmp(enableorange, "on")) {
- if (strlen(orangeif)) {
+ if (strlen(orangeif) > 0) {
createChain(OVPNORANGE);
createChainReference(OVPNORANGE);
} else {
}
if (!strcmp(enableblue, "on")) {
- if (strlen(blueif)) {
+ if (strlen(blueif) > 0) {
createChain(OVPNBLUE);
createChainReference(OVPNBLUE);
} else {
}
if (!strcmp(enablered, "on")) {
- if (strlen(redif)) {
+ if (strlen(redif) > 0) {
createChain(OVPNRED);
createChainReference(OVPNRED);
} else {
}
}
+char* calcTransferNetAddress(const connection* conn) {
+ char *subnetmask = strdup(conn->transfer_subnet);
+ char *address = strsep(&subnetmask, "/");
+
+ if ((address == NULL) || (subnetmask == NULL)) {
+ goto ERROR;
+ }
+
+ in_addr_t _address = inet_addr(address);
+ in_addr_t _subnetmask = inet_addr(subnetmask);
+ _address &= _subnetmask;
+
+ if (strcmp(conn->role, "server") == 0) {
+ _address += 1 << 24;
+ } else if (strcmp(conn->role, "client") == 0) {
+ _address += 2 << 24;
+ } else {
+ goto ERROR;
+ }
+
+ struct in_addr address_info;
+ address_info.s_addr = _address;
+
+ return inet_ntoa(address_info);
+
+ERROR:
+ fprintf(stderr, "Could not determine transfer net address: %s\n", conn->name);
+
+ free(address);
+ return NULL;
+}
+
+char* getLocalSubnetAddress(const connection* conn) {
+ kv = initkeyvalues();
+ if (!readkeyvalues(kv, CONFIG_ROOT "/ethernet/settings")) {
+ fprintf(stderr, "Cannot read ethernet settings\n");
+ exit(1);
+ }
+
+ const char *zones[] = {"GREEN", "BLUE", "ORANGE", NULL};
+ char *zone = NULL;
+
+ // Get net address of the local openvpn subnet.
+ char *subnetmask = strdup(conn->local_subnet);
+ char *address = strsep(&subnetmask, "/");
+
+ if ((address == NULL) || (subnetmask == NULL)) {
+ goto ERROR;
+ }
+
+ in_addr_t _address = inet_addr(address);
+ in_addr_t _subnetmask = inet_addr(subnetmask);
+
+ in_addr_t _netaddr = (_address & _subnetmask);
+ in_addr_t _broadcast = (_address | ~_subnetmask);
+
+ char zone_address_key[STRING_SIZE];
+ char zone_address[STRING_SIZE];
+ in_addr_t zone_addr;
+
+ int i = 0;
+ while (zones[i]) {
+ zone = zones[i++];
+ snprintf(zone_address_key, STRING_SIZE, "%s_ADDRESS", zone);
+
+ if (!findkey(kv, zone_address_key, zone_address))
+ continue;
+
+ zone_addr = inet_addr(zone_address);
+ if ((zone_addr > _netaddr) && (zone_addr < _broadcast)) {
+ freekeyvalues(kv);
+
+ return strdup(zone_address);
+ }
+ }
+
+ERROR:
+ fprintf(stderr, "Could not determine local subnet address: %s\n", conn->name);
+
+ freekeyvalues(kv);
+ return NULL;
+}
+
void setFirewallRules(void) {
char protocol[STRING_SIZE] = "";
char dport[STRING_SIZE] = "";
if (!findkey(kv, "VPN_IP", dovpnip)){
fprintf(stderr, "Cannot read VPN_IP\n");
-// exit(1); step further as we don't need an ip
}
freekeyvalues(kv);
// Flush all chains.
- flushChain(OVPNRED);
- flushChain(OVPNBLUE);
- flushChain(OVPNORANGE);
+ flushChainINPUT(OVPNRED);
+ flushChainINPUT(OVPNBLUE);
+ flushChainINPUT(OVPNORANGE);
+ flushChain(OVPNBLOCK);
+ flushChainNAT(OVPNNAT);
// set firewall rules
if (!strcmp(enablered, "on") && strlen(redif))
// set firewall rules for n2n connections
char command[STRING_SIZE];
+ char *local_subnet_address = NULL;
+ char *transfer_subnet_address = NULL;
while (conn != NULL) {
if (strcmp(conn->type, "net") == 0) {
sprintf(command, "/sbin/iptables -A %sINPUT -i %s -p %s --dport %d -j ACCEPT",
OVPNRED, redif, conn->proto, conn->port);
executeCommand(command);
+
+ /* Block all communication from the transfer nets. */
+ snprintf(command, STRING_SIZE, "/sbin/iptables -A %s -s %s -j DROP",
+ OVPNBLOCK, conn->transfer_subnet);
+ executeCommand(command);
+
+ local_subnet_address = getLocalSubnetAddress(conn);
+ transfer_subnet_address = calcTransferNetAddress(conn);
+
+ if ((local_subnet_address) && (transfer_subnet_address)) {
+ snprintf(command, STRING_SIZE, "/sbin/iptables -t nat -A %s -s %s -j SNAT --to-source %s",
+ OVPNNAT, transfer_subnet_address, local_subnet_address);
+ executeCommand(command);
+ }
}
conn = conn->next;
void startDaemon(void) {
char command[STRING_SIZE];
- if (!((strcmp(enablered, "on")==0) || (strcmp(enableblue, "on")==0) || (strcmp(enableorange, "on")==0))){
+ if (!((strcmp(enablered, "on") == 0) || (strcmp(enableblue, "on") == 0) || (strcmp(enableorange, "on") == 0))) {
fprintf(stderr, "OpenVPN is not enabled on any interface\n");
exit(1);
} else {
projects / people / teissler / ipfire-2.x.git / blobdiff