#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 "libsmooth.h"
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 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) {
safe_system(str);
}
+void flushChainNAT(char *chain) {
+ char str[STRING_SIZE];
+
+ sprintf(str, "/sbin/iptables -t nat -F %s", chain);
+ executeCommand(str);
+}
+
void deleteChainReference(char *chain) {
char str[STRING_SIZE];
}
}
+char* calcTransferNetAddress(const connection* conn) {
+ char *subnetmask = strdup(conn->transfer_subnet);
+ char *address = strsep(&subnetmask, "/");
+
+ 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] = "";
flushChain(OVPNRED);
flushChain(OVPNBLUE);
flushChain(OVPNORANGE);
+ 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);
+
+ local_subnet_address = getLocalSubnetAddress(conn);
+ transfer_subnet_address = calcTransferNetAddress(conn);
+
+ if ((!local_subnet_address) || (!transfer_subnet_address))
+ continue;
+
+ 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;