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Transparant proxy support for FreeBSD

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This commit is contained in:
Yves Rutschle 2014-12-25 20:08:24 +01:00
commit 56fdc6b4af
3 changed files with 65 additions and 3 deletions
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2
Makefile
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@ -2,7 +2,7 @@
VERSION=$(shell ./genver.sh -r)
USELIBCONFIG=1 # Use libconfig? (necessary to use configuration files)
USELIBWRAP= # Use libwrap?
USELIBWRAP?= # Use libwrap?
USELIBCAP= # Use libcap?
COV_TEST= # Perform test coverage?
PREFIX=/usr/local

39
README.md
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@ -217,13 +217,15 @@ transparent proxying, just don't use it (or use the libcap method).
Transparent proxy support
-------------------------
On Linux (only?) you can use the `--transparent` option to
On Linux and FreeBSD you can use the `--transparent` option to
request transparent proying. This means services behind `sslh`
(Apache, `sshd` and so on) will see the external IP and ports
as if the external world connected directly to them. This
simplifies IP-based access control (or makes it possible at
all).
Linux:
`sslh` needs extended rights to perform this: you'll need to
give it `CAP_NET_ADMIN` capabilities (see appropriate chapter)
or run it as root (but don't do that).
@ -241,6 +243,41 @@ this scheme -- let me know if you manage that:
# ip rule add fwmark 0x1 lookup 100
# ip route add local 0.0.0.0/0 dev lo table 100
FreeBSD:
Given you have no firewall defined yet, you can use the following configuration
to have ipfw properly redirect traffic back to sslh
/etc/rc.conf
firewall_enable="YES"
firewall_type="open"
firewall_logif="YES"
firewall_coscripts="/etc/ipfw/sslh.rules"
/etc/ipfw/sslh.rules
#! /bin/sh
# ssl
ipfw add 20000 fwd 192.0.2.1,443 log tcp from 192.0.2.1 8443 to any out
ipfw add 20010 fwd 2001:db8::1,443 log tcp from 2001:db8::1 8443 to any out
# ssh
ipfw add 20100 fwd 192.0.2.1,443 log tcp from 192.0.2.1 8022 to any out
ipfw add 20110 fwd 2001:db8::1,443 log tcp from 2001:db8::1 8022 to any out
# xmpp
ipfw add 20200 fwd 192.0.2.1,443 log tcp from 192.0.2.1 5222 to any out
ipfw add 20210 fwd 2001:db8::1,443 log tcp from 2001:db8::1 5222 to any out
# openvpn (running on other internal system)
ipfw add 20300 fwd 192.0.2.1,443 log tcp from 198.51.100.7 1194 to any out
ipfw add 20310 fwd 2001:db8::1,443 log tcp from 2001:db8:1::7 1194 to any out
General notes:
This will only work if `sslh` does not use any loopback
addresses (no `127.0.0.1` or `localhost`), you'll need to use
explicit IP addresses (or names):

27
common.c
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@ -120,8 +120,20 @@ int bind_peer(int fd, int fd_from)
* got here */
res = getpeername(fd_from, from.ai_addr, &from.ai_addrlen);
CHECK_RES_RETURN(res, "getpeername");
#ifndef IP_BINDANY /* use IP_TRANSPARENT */
res = setsockopt(fd, IPPROTO_IP, IP_TRANSPARENT, &trans, sizeof(trans));
CHECK_RES_DIE(res, "setsockopt");
#else
if (from.ai_addr->sa_family==AF_INET) { /* IPv4 */
res = setsockopt(fd, IPPROTO_IP, IP_BINDANY, &trans, sizeof(trans));
CHECK_RES_RETURN(res, "setsockopt IP_BINDANY");
#ifdef IPV6_BINDANY
} else { /* IPv6 */
res = setsockopt(fd, IPPROTO_IPV6, IPV6_BINDANY, &trans, sizeof(trans));
CHECK_RES_RETURN(res, "setsockopt IPV6_BINDANY");
#endif /* IPV6_BINDANY */
}
#endif /* IP_TRANSPARENT / IP_BINDANY */
res = bind(fd, from.ai_addr, from.ai_addrlen);
CHECK_RES_RETURN(res, "bind");
@ -134,15 +146,28 @@ int bind_peer(int fd, int fd_from)
* of new file descriptor. */
int connect_addr(struct connection *cnx, int fd_from)
{
struct addrinfo *a;
struct addrinfo *a, from;
struct sockaddr_storage ss;
char buf[NI_MAXHOST];
int fd, res;
memset(&from, 0, sizeof(from));
from.ai_addr = (struct sockaddr*)&ss;
from.ai_addrlen = sizeof(ss);
res = getpeername(fd_from, from.ai_addr, &from.ai_addrlen);
CHECK_RES_RETURN(res, "getpeername");
for (a = cnx->proto->saddr; a; a = a->ai_next) {
/* When transparent, make sure both connections use the same address family */
if (transparent && a->ai_family != from.ai_addr->sa_family)
continue;
if (verbose)
fprintf(stderr, "connecting to %s family %d len %d\n",
sprintaddr(buf, sizeof(buf), a),
a->ai_addr->sa_family, a->ai_addrlen);
/* XXX Needs to match ai_family from fd_from when being transparent! */
fd = socket(a->ai_family, SOCK_STREAM, 0);
if (fd == -1) {
log_message(LOG_ERR, "forward to %s failed:socket: %s\n",