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miniupnp/miniupnpd/upnppinhole.c

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/* $Id: upnppinhole.c,v 1.13 2018/03/13 10:49:13 nanard Exp $ */
/* MiniUPnP project
* http://miniupnp.free.fr/ or http://miniupnp.tuxfamily.org/
* (c) 2006-2018 Thomas Bernard
* This software is subject to the conditions detailed
* in the LICENCE file provided within the distribution */
#include <stdlib.h>
#include <string.h>
#include <syslog.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <net/if.h>
#include <arpa/inet.h>
#include <stdio.h>
#include <ctype.h>
#include <unistd.h>
#include "macros.h"
#include "config.h"
#include "upnpredirect.h"
#include "upnpglobalvars.h"
#include "upnpevents.h"
#include "upnputils.h"
#include "upnppinhole.h"
#ifdef __APPLE__
/* XXX - Apple version of PF API seems to differ from what
* pf/pfpinhole.c expects so don't use that at least.. */
#ifdef USE_PF
#undef USE_PF
#endif /* USE_PF */
#endif /* __APPLE__ */
#if defined(USE_NETFILTER)
#include "netfilter/iptpinhole.h"
#endif
#if defined(USE_PF)
#include "pf/pfpinhole.h"
#endif
#if defined(USE_IPF)
#endif
#if defined(USE_IPFW)
#endif
#ifdef ENABLE_UPNPPINHOLE
#if 0
int
upnp_check_outbound_pinhole(int proto, int * timeout)
{
int s, tmptimeout, tmptime_out;
switch(proto)
{
case IPPROTO_UDP:
s = retrieve_timeout("udp_timeout", timeout);
return s;
break;
case IPPROTO_UDPLITE:
s = retrieve_timeout("udp_timeout_stream", timeout);
return s;
break;
case IPPROTO_TCP:
s = retrieve_timeout("tcp_timeout_established", timeout);
return s;
break;
case 65535:
s = retrieve_timeout("udp_timeout", timeout);
s = retrieve_timeout("udp_timeout_stream", &tmptimeout);
s = retrieve_timeout("tcp_timeout_established", &tmptime_out);
if(tmptimeout<tmptime_out)
{
if(tmptimeout<*timeout)
*timeout = tmptimeout;
}
else
{
if(tmptime_out<*timeout)
*timeout = tmptimeout;
}
return s;
break;
default:
return -5;
break;
}
return 0;
}
#endif
int
upnp_find_inboundpinhole(const char * raddr, unsigned short rport,
const char * iaddr, unsigned short iport,
int proto, char * desc, int desc_len, unsigned int * leasetime)
{
#if defined(USE_PF) || defined(USE_NETFILTER)
int uid;
uid = find_pinhole(NULL, raddr, rport, iaddr, iport, proto,
desc, desc_len, leasetime);
return uid;
#else
return -42;
#endif
}
/* upnp_add_inboundpinhole()
* returns: 1 on success
* -1 Pinhole space exhausted
* -4 invalid arguments
* -42 not implemented
* TODO : return uid on success (positive) or error value (negative)
*/
int
upnp_add_inboundpinhole(const char * raddr,
unsigned short rport,
const char * iaddr,
unsigned short iport,
int proto,
char * desc,
unsigned int leasetime,
int * uid)
{
int r;
time_t current;
unsigned int timestamp;
struct in6_addr address;
r = inet_pton(AF_INET6, iaddr, &address);
if(r <= 0) {
syslog(LOG_ERR, "inet_pton(%d, %s, %p) FAILED",
AF_INET6, iaddr, &address);
return -4;
}
current = upnp_time();
timestamp = current + leasetime;
r = 0;
*uid = upnp_find_inboundpinhole(raddr, rport, iaddr, iport, proto, NULL, 0, NULL);
if(*uid >= 0) {
syslog(LOG_INFO, "Pinhole for inbound traffic from [%s]:%hu to [%s]:%hu with proto %d found uid=%d. Updating it.", raddr, rport, iaddr, iport, proto, *uid);
r = upnp_update_inboundpinhole(*uid, timestamp);
return (r >= 0) ? 1 : r;
}
#if defined(USE_PF) || defined(USE_NETFILTER)
*uid = add_pinhole (ext_if_name, raddr, rport,
iaddr, iport, proto, desc, timestamp);
return *uid >= 0 ? 1 : -1;
#else
return -42; /* not implemented */
#endif
}
#if 0
int
upnp_add_inboundpinhole_internal(const char * raddr, unsigned short rport,
const char * iaddr, unsigned short iport,
const char * proto, int * uid)
{
int c = 9999;
char cmd[256], cmd_raw[256], cuid[42];
#if 0
static const char cmdval_full_udptcp[] = "ip6tables -I %s %d -p %s -i %s -s %s --sport %hu -d %s --dport %hu -j ACCEPT";
static const char cmdval_udptcp[] = "ip6tables -I %s %d -p %s -i %s --sport %hu -d %s --dport %hu -j ACCEPT";
static const char cmdval_full_udplite[] = "ip6tables -I %s %d -p %s -i %s -s %s -d %s -j ACCEPT";
static const char cmdval_udplite[] = "ip6tables -I %s %d -p %s -i %s -d %s -j ACCEPT";
// raw table command
static const char cmdval_full_udptcp_raw[] = "ip6tables -t raw -I PREROUTING %d -p %s -i %s -s %s --sport %hu -d %s --dport %hu -j TRACE";
static const char cmdval_udptcp_raw[] = "ip6tables -t raw -I PREROUTING %d -p %s -i %s --sport %hu -d %s --dport %hu -j TRACE";
static const char cmdval_full_udplite_raw[] = "ip6tables -t raw -I PREROUTING %d -p %s -i %s -s %s -d %s -j TRACE";
static const char cmdval_udplite_raw[] = "ip6tables -t raw -I PREROUTING %d -p %s -i %s -d %s -j TRACE";
#endif
/*printf("%s\n", raddr);*/
if(raddr!=NULL)
{
#ifdef IPPROTO_UDPLITE
if(atoi(proto) == IPPROTO_UDPLITE)
{
/* snprintf(cmd, sizeof(cmd), cmdval_full_udplite, miniupnpd_forward_chain, line_number, proto, ext_if_name, raddr, iaddr);
snprintf(cmd_raw, sizeof(cmd_raw), cmdval_full_udplite_raw, line_number, proto, ext_if_name, raddr, iaddr);*/
}
else
#endif
{
/* snprintf(cmd, sizeof(cmd), cmdval_full_udptcp, miniupnpd_forward_chain, line_number, proto, ext_if_name, raddr, rport, iaddr, iport);
snprintf(cmd_raw, sizeof(cmd_raw), cmdval_full_udptcp_raw, line_number, proto, ext_if_name, raddr, rport, iaddr, iport);*/
}
}
else
{
#ifdef IPPROTO_UDPLITE
if(atoi(proto) == IPPROTO_UDPLITE)
{
/*snprintf(cmd, sizeof(cmd), cmdval_udplite, miniupnpd_forward_chain, line_number, proto, ext_if_name, iaddr);
snprintf(cmd_raw, sizeof(cmd_raw), cmdval_udplite_raw, line_number, proto, ext_if_name, iaddr);*/
}
else
#endif
{
/*snprintf(cmd, sizeof(cmd), cmdval_udptcp, miniupnpd_forward_chain, line_number, proto, ext_if_name, rport, iaddr, iport);
snprintf(cmd_raw, sizeof(cmd_raw), cmdval_udptcp_raw, line_number, proto, ext_if_name, rport, iaddr, iport);
*/
}
}
#ifdef DEBUG
syslog(LOG_INFO, "Adding following ip6tables rule:");
syslog(LOG_INFO, " -> %s", cmd);
syslog(LOG_INFO, " -> %s", cmd_raw);
#endif
/* TODO Add a better checking error.*/
if(system(cmd) < 0 || system(cmd_raw) < 0)
{
return 0;
}
srand(time(NULL));
snprintf(cuid, sizeof(cuid), "%.4d", rand()%c);
*uid = atoi(cuid);
printf("\t_add_ uid: %s\n", cuid);
return 1;
}
#endif
/* upnp_get_pinhole_info()
* return values :
* 0 OK
* -1 Internal error
* -2 NOT FOUND (no such entry)
* ..
* -42 Not implemented
*/
int
upnp_get_pinhole_info(unsigned short uid,
char * raddr, int raddrlen,
unsigned short * rport,
char * iaddr, int iaddrlen,
unsigned short * iport,
int * proto, char * desc, int desclen,
unsigned int * leasetime,
unsigned int * packets)
{
/* Call Firewall specific code to get IPv6 pinhole infos */
#if defined(USE_PF) || defined(USE_NETFILTER)
int r;
unsigned int timestamp;
u_int64_t packets_tmp;
/*u_int64_t bytes_tmp;*/
r = get_pinhole_info(uid, raddr, raddrlen, rport,
iaddr, iaddrlen, iport,
proto, desc, desclen,
leasetime ? &timestamp : NULL,
packets ? &packets_tmp : NULL,
NULL/*&bytes_tmp*/);
if(r >= 0) {
if(leasetime) {
time_t current_time;
current_time = upnp_time();
if(timestamp > (unsigned int)current_time)
*leasetime = timestamp - current_time;
else
*leasetime = 0;
}
if(packets)
*packets = (unsigned int)packets_tmp;
}
return r;
#else
UNUSED(uid);
UNUSED(raddr); UNUSED(raddrlen); UNUSED(rport);
UNUSED(iaddr); UNUSED(iaddrlen); UNUSED(iport);
UNUSED(proto); UNUSED(desc); UNUSED(desclen);
UNUSED(leasetime); UNUSED(packets);
return -42; /* not implemented */
#endif
}
int
upnp_get_pinhole_uid_by_index(int index)
{
#if defined (USE_NETFILTER)
return get_pinhole_uid_by_index(index);
#else
UNUSED(index);
return -42;
#endif /* defined (USE_NETFILTER) */
}
int
upnp_update_inboundpinhole(unsigned short uid, unsigned int leasetime)
{
#if defined(USE_PF) || defined(USE_NETFILTER)
unsigned int timestamp;
timestamp = upnp_time() + leasetime;
return update_pinhole(uid, timestamp);
#else
UNUSED(uid); UNUSED(leasetime);
return -42; /* not implemented */
#endif
}
int
upnp_delete_inboundpinhole(unsigned short uid)
{
#if defined(USE_PF) || defined(USE_NETFILTER)
return delete_pinhole(uid);
#else
UNUSED(uid);
return -1;
#endif
}
#if 0
/*
* Result:
* 1: Found Result
* -4: No result
* -5: Result in another table
* -6: Result in another chain
* -7: Result in a chain not a rule
*/
int
upnp_check_pinhole_working(const char * uid,
char * eaddr,
char * iaddr,
unsigned short * eport,
unsigned short * iport,
char * protocol,
int * rulenum_used)
{
/* TODO : to be implemented */
#if 0
FILE * fd;
time_t expire = upnp_time();
char buf[1024], filename[] = "/var/log/kern.log", expire_time[32]="";
int res = -4, str_len;
str_len = strftime(expire_time, sizeof(expire_time), "%b %d %H:%M:%S", localtime(&expire));
fd = fopen(filename, "r");
if (fd==NULL)
{
syslog(LOG_ERR, "Get_rule: could not open file: %s", filename);
return -1;
}
syslog(LOG_INFO, "Get_rule: Starting getting info in file %s for %s\n", filename, uid);
buf[sizeof(buf)-1] = 0;
while(fgets(buf, sizeof(buf)-1, fd) != NULL && res != 1)
{
//printf("line: %s\n", buf);
char * r, * t, * c, * p;
// looking for something like filter:FORWARD:rule: or filter:MINIUPNPD:rule:
r = strstr(buf, ":rule:");
p = strstr(buf, ":policy:");
t = strstr(buf, "TRACE:"); // table pointeur
t += 7;
c = t + 7; // chain pointeur
if(r)
{
printf("\t** Found %.*s\n", 24 ,t);
char * src, * dst, * sport, * dport, * proto, * line;
char time[15]="", src_addr[40], dst_addr[40], proto_tmp[8];
int proto_int;
strncpy(time, buf, sizeof(time));
/*if(compare_time(time, expire_time)<0)
{
printf("\t\tNot corresponding time\n");
continue;
}*/
line = r + 6;
printf("\trule line = %d\n", atoi(line));
src = strstr(buf, "SRC=");
src += 4;
snprintf(src_addr, sizeof(src_addr), "%.*s", 39, src);
#if 0
del_char(src_addr);
add_char(src_addr);
#endif
dst = strstr(buf, "DST=");
dst += 4;
snprintf(dst_addr, sizeof(dst_addr), "%.*s", 39, dst);
#if 0
del_char(dst_addr);
add_char(dst_addr);
#endif
proto = strstr(buf, "PROTO=");
proto += 6;
proto_int = atoi(protocol);
if(proto_int == IPPROTO_UDP)
strcpy(proto_tmp, "UDP");
else if(proto_int == IPPROTO_TCP)
strcpy(proto_tmp, "TCP");
#ifdef IPPROTO_UDPLITE
else if(proto_int == IPPROTO_UDPLITE)
strcpy(proto_tmp, "UDPLITE");
#endif
else
strcpy(proto_tmp, "UnsupportedProto");
// printf("\tCompare eaddr: %s // protocol: %s\n\t to addr: %s // protocol: %.*s\n", eaddr, proto_tmp, src_addr, strlen(proto_tmp), proto);
// printf("\tCompare iaddr: %s // protocol: %s\n\t to addr: %s // protocol: %.*s\n", iaddr, proto_tmp, dst_addr, strlen(proto_tmp), proto);
// TODO Check time
// Check that the paquet found in trace correspond to the one we are looking for
if( /*(strcmp(eaddr, src_addr) == 0) &&*/ (strcmp(iaddr, dst_addr) == 0) && (strncmp(proto_tmp, proto, strlen(proto_tmp))==0))
{
sport = strstr(buf, "SPT=");
sport += 4;
dport = strstr(buf, "DPT=");
dport += 4;
printf("\tCompare eport: %hu\n\t to port: %d\n", *eport, atoi(sport));
printf("\tCompare iport: %hu\n\t to port: %d\n", *iport, atoi(dport));
if(/*eport != atoi(sport) &&*/ *iport != atoi(dport))
{
printf("\t\tPort not corresponding\n");
continue;
}
printf("\ttable found: %.*s\n", 6, t);
printf("\tchain found: %.*s\n", 9, c);
// Check that the table correspond to the filter table
if(strncmp(t, "filter", 6)==0)
{
// Check that the table correspond to the MINIUPNP table
if(strncmp(c, "MINIUPNPD", 9)==0)
{
*rulenum_used = atoi(line);
res = 1;
}
else
{
res = -6;
continue;
}
}
else
{
res = -5;
continue;
}
}
else
{
printf("Packet information not corresponding\n");
continue;
}
}
if(!r && p)
{
printf("\t** Policy case\n");
char * src, * dst, * sport, * dport, * proto, * line;
char time[15], src_addr[40], dst_addr[40], proto_tmp[8];
int proto_int;
strncpy(time, buf, sizeof(time));
/*if(compare_time(time, expire_time)<0)
{
printf("\t\tNot corresponding time\n");
continue;
}*/
line = p + 8;
printf("\trule line = %d\n", atoi(line));
src = strstr(buf, "SRC=");
src += 4;
snprintf(src_addr, sizeof(src_addr), "%.*s", 39, src);
#if 0
del_char(src_addr);
add_char(src_addr);
#endif
dst = strstr(buf, "DST=");
dst += 4;
snprintf(dst_addr, sizeof(dst_addr), "%.*s", 39, dst);
#if 0
del_char(dst_addr);
add_char(dst_addr);
#endif
proto = strstr(buf, "PROTO=");
proto += 6;
proto_int = atoi(protocol);
if(proto_int == IPPROTO_UDP)
strcpy(proto_tmp, "UDP");
else if(proto_int == IPPROTO_TCP)
strcpy(proto_tmp, "TCP");
#ifdef IPPROTO_UDPLITE
else if(proto_int == IPPROTO_UDPLITE)
strcpy(proto_tmp, "UDPLITE");
#endif
else
strcpy(proto_tmp, "UnsupportedProto");
// printf("\tCompare eaddr: %s // protocol: %s\n\t to addr: %s // protocol: %.*s\n", eaddr, proto_tmp, src_addr, strlen(proto_tmp), proto);
// printf("\tCompare iaddr: %s // protocol: %s\n\t to addr: %s // protocol: %.*s\n", iaddr, proto_tmp, dst_addr, strlen(proto_tmp), proto);
// Check that the paquet found in trace correspond to the one we are looking for
if( (strcmp(eaddr, src_addr) == 0) && (strcmp(iaddr, dst_addr) == 0) && (strncmp(proto_tmp, proto, 5)==0))
{
sport = strstr(buf, "SPT=");
sport += 4;
dport = strstr(buf, "DPT=");
dport += 4;
printf("\tCompare eport: %hu\n\t to port: %d\n", *eport, atoi(sport));
printf("\tCompare iport: %hu\n\t to port: %d\n", *iport, atoi(dport));
if(*eport != atoi(sport) && *iport != atoi(dport))
{
printf("\t\tPort not corresponding\n");
continue;
}
else
{
printf("Find a corresponding policy trace in the chain: %.*s\n", 10, c);
res = -7;
continue;
}
}
else
continue;
}
}
fclose(fd);
return res;
#else
return -42; /* to be implemented */
#endif
}
#endif
int
upnp_clean_expired_pinholes(unsigned int * next_timestamp)
{
#if defined(USE_PF) || defined(USE_NETFILTER)
return clean_pinhole_list(next_timestamp);
#else
UNUSED(next_timestamp);
return 0; /* nothing to do */
#endif
}
#endif /* ENABLE_UPNPPINHOLE */
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