mirror of
https://github.com/moparisthebest/sslh
synced 2024-12-21 23:08:58 -05:00
v1.5: 10DEC2008
Fixed zombie generation.
Added support scripts (), Makefile.
Changed all 'connexions' to 'connections' to please
pesky users. Damn users.
This commit is contained in:
Yves Rutschle
parent
3386a64a4d
commit
b965d735b8
23
Makefile
Normal file
23
Makefile
Normal file
@ -0,0 +1,23 @@
|
||||
# Configuration
|
||||
|
||||
USELIBWRAP=1 # Use libwrap?
|
||||
|
||||
|
||||
# End of configuration -- the rest should take care of
|
||||
# itself
|
||||
|
||||
CC = gcc
|
||||
|
||||
#LIBS=-lnet
|
||||
LIBS=
|
||||
|
||||
ifneq ($(strip $(USELIBWRAP)),)
|
||||
LIBS:=$(LIBS) -lwrap
|
||||
CFLAGS=-DLIBWRAP
|
||||
endif
|
||||
|
||||
all:
|
||||
$(CC) $(CFLAGS) -o sslh sslh.c $(LIBS)
|
||||
strip sslh
|
||||
|
||||
|
||||
83
README
Normal file
83
README
Normal file
@ -0,0 +1,83 @@
|
||||
sslh -- A ssl/ssh multiplexer.
|
||||
|
||||
sslh lets one accept both HTTPS and SSH connections on the
|
||||
same port. It makes it possible to connect to an SSH server
|
||||
on port 443 (e.g. from inside a corporate firewall) while
|
||||
still serving HTTPS on that port.
|
||||
|
||||
|
||||
Compilation instructions:
|
||||
|
||||
Solaris:
|
||||
cc -o sslh sslh.c -lresolv -lsocket -lnsl
|
||||
|
||||
LynxOS:
|
||||
gcc -o tcproxy tcproxy.c -lnetinet
|
||||
|
||||
Linux:
|
||||
cc -o sslh sslh.c -lnet
|
||||
or:
|
||||
cc -o sslh sslh.c
|
||||
|
||||
To compile with libwrap support:
|
||||
cc -o sslh -DLIBWRAP sslh.c -lwrap
|
||||
|
||||
To install:
|
||||
|
||||
make
|
||||
cp sslh /usr/local/sbin
|
||||
cp scripts/etc.init.d.sslh /etc/init.d/sslh
|
||||
cp scripts/etc.default.sslh /etc/default/sslh
|
||||
|
||||
You can edit settings in /etc/default/sslh:
|
||||
|
||||
PIDFILE=/var/run/sslh.pid
|
||||
LISTEN=ifname:443
|
||||
SSH=localhost:22
|
||||
SSL=localhost:443
|
||||
|
||||
A good scheme is to use the external name of the machine in
|
||||
$LISTEN, and bind httpd to localhost:443: that way, https
|
||||
connections coming from inside your network don't need to go
|
||||
through sslh, and sslh is only there as a frontal for
|
||||
connections coming from the internet.
|
||||
|
||||
Sslh can optionnaly perform libwrap checks for the sshd
|
||||
service: because the connection to sshd will be coming
|
||||
locally from sslh, sshd cannot determine the IP of the
|
||||
client.
|
||||
|
||||
Comments? questions? sslh@rutschle.net
|
||||
|
||||
HISTORY
|
||||
|
||||
v1.5: 10DEC2008
|
||||
Fixed zombie generation.
|
||||
Added support scripts (), Makefile.
|
||||
Changed all 'connexions' to 'connections' to please
|
||||
pesky users. Damn users.
|
||||
|
||||
v1.4: 13JUL2008
|
||||
Added libwrap support for ssh service (Christian Weinberger)
|
||||
Only SSH is libwraped, not SSL.
|
||||
|
||||
v1.3: 14MAY2008
|
||||
Added parsing for local interface to listen on
|
||||
Changed default SSL connection to port 442 (443 doesn't make
|
||||
sense as a default as we're already listening on 443)
|
||||
Syslog incoming connections
|
||||
|
||||
v1.2: 12MAY2008
|
||||
Fixed compilation warning for AMD64 (Thx Daniel Lange)
|
||||
|
||||
v1.1: 21MAY2007
|
||||
Making sslhc more like a real daemon:
|
||||
* If $PIDFILE is defined, write first PID to it upon startup
|
||||
* Fork at startup (detach from terminal)
|
||||
(thanks to http://www.enderunix.org/docs/eng/daemon.php -- good checklist)
|
||||
* Less memory usage (?)
|
||||
|
||||
v1.0:
|
||||
* Basic functionality: privilege dropping, target hostnames and ports
|
||||
configurable.
|
||||
|
||||
4
scripts/etc.default.sslh
Executable file
4
scripts/etc.default.sslh
Executable file
@ -0,0 +1,4 @@
|
||||
PIDFILE=/var/run/sslh.pid
|
||||
LISTEN=ifname:443
|
||||
SSH=localhost:22
|
||||
SSL=localhost:443
|
||||
62
scripts/etc.init.d.sslh
Executable file
62
scripts/etc.init.d.sslh
Executable file
@ -0,0 +1,62 @@
|
||||
#! /bin/sh
|
||||
|
||||
### BEGIN INIT INFO
|
||||
# Provides: sslh
|
||||
# Default-Start: 2 3 4 5
|
||||
# Default-Stop: 1
|
||||
# Short-Description: sslh proxy ssl & ssh connections
|
||||
### END INIT INFO
|
||||
|
||||
set -e
|
||||
tag=sslh
|
||||
facility=user.info
|
||||
|
||||
# /etc/init.d/sslh: start and stop the sslh proxy daemon
|
||||
|
||||
# Defaults -- can be overridden in /etc/default/sslh
|
||||
PIDFILE=/var/run/sslh.pid
|
||||
LISTEN=thelonious:443
|
||||
SSH=localhost:22
|
||||
SSL=localhost:443
|
||||
|
||||
if test -f /etc/default/sslh; then
|
||||
. /etc/default/sslh
|
||||
export PIDFILE=${PIDFILE}
|
||||
fi
|
||||
|
||||
DAEMON=/usr/local/sbin/sslh
|
||||
|
||||
start()
|
||||
{
|
||||
echo "Start services: sslh"
|
||||
$DAEMON -u nobody -p ${LISTEN} -s ${SSH} -l ${SSL}
|
||||
logger -t ${tag} -p ${facility} -i 'Started sslh'
|
||||
}
|
||||
|
||||
stop()
|
||||
{
|
||||
echo "Stop services: sslh"
|
||||
killall $DAEMON
|
||||
rm ${PIDFILE}
|
||||
logger -t ${tag} -p ${facility} -i 'Stopped sslh'
|
||||
}
|
||||
|
||||
|
||||
case "$1" in
|
||||
start)
|
||||
start
|
||||
;;
|
||||
stop)
|
||||
stop
|
||||
;;
|
||||
restart)
|
||||
stop
|
||||
sleep 5
|
||||
start
|
||||
;;
|
||||
*)
|
||||
echo "Usage: /etc/init.d/sslh {start|stop|restart}" >&2
|
||||
;;
|
||||
esac
|
||||
|
||||
exit 0
|
||||
88
sslh.c
88
sslh.c
@ -18,44 +18,9 @@
|
||||
# The full text for the General Public License is here:
|
||||
# http://www.gnu.org/licenses/gpl.html
|
||||
|
||||
Comments? questions? sslh@rutschle.net
|
||||
|
||||
Compilation instructions:
|
||||
|
||||
Solaris:
|
||||
cc -o sslh sslh.c -lresolv -lsocket -lnsl
|
||||
|
||||
LynxOS:
|
||||
gcc -o tcproxy tcproxy.c -lnetinet
|
||||
|
||||
Linux:
|
||||
cc -o sslh sslh.c -lnet
|
||||
|
||||
HISTORY
|
||||
|
||||
v1.3: 14MAY2008
|
||||
Added parsing for local interface to listen on
|
||||
Changed default SSL connexion to port 442 (443 doesn't make
|
||||
sense as a default as we're already listening on 443)
|
||||
Syslog incoming connexions
|
||||
|
||||
v1.2: 12MAY2008
|
||||
Fixed compilation warning for AMD64 (Thx Daniel Lange)
|
||||
|
||||
v1.1: 21MAY2007
|
||||
Making sslhc more like a real daemon:
|
||||
* If $PIDFILE is defined, write first PID to it upon startup
|
||||
* Fork at startup (detach from terminal)
|
||||
(thanks to http://www.enderunix.org/docs/eng/daemon.php -- good checklist)
|
||||
* Less memory usage (?)
|
||||
|
||||
v1.0:
|
||||
* Basic functionality: privilege dropping, target hostnames and ports
|
||||
configurable.
|
||||
|
||||
*/
|
||||
|
||||
#define VERSION "1.3"
|
||||
#define VERSION "1.5"
|
||||
|
||||
#include <sys/types.h>
|
||||
#include <fcntl.h>
|
||||
@ -72,6 +37,12 @@ v1.0:
|
||||
#include <pwd.h>
|
||||
#include <syslog.h>
|
||||
|
||||
#ifdef LIBWRAP
|
||||
#include <tcpd.h>
|
||||
int allow_severity =0, deny_severity = 0;
|
||||
#endif
|
||||
|
||||
|
||||
#define CHECK_RES_DIE(res, str) \
|
||||
if (res == -1) { \
|
||||
perror(str); \
|
||||
@ -86,8 +57,8 @@ if (res == -1) { \
|
||||
"\t\t-s [sshhost:]port -l [sslhost:]port [-v]\n\n" \
|
||||
"-v: verbose\n" \
|
||||
"-p: address and port to listen on. default: 0.0.0.0:443\n" \
|
||||
"-s: SSH address: where to connect an SSH connexion. default: localhost:22\n" \
|
||||
"-l: SSL address: where to connect an SSL connexion.\n" \
|
||||
"-s: SSH address: where to connect an SSH connection. default: localhost:22\n" \
|
||||
"-l: SSL address: where to connect an SSL connection.\n" \
|
||||
""
|
||||
|
||||
int verbose = 0; /* That's really quite global */
|
||||
@ -227,7 +198,7 @@ void resolve_name(struct sockaddr *sock, char* fullname) {
|
||||
}
|
||||
|
||||
/* syslogs who connected to where */
|
||||
void log_connexion(int socket, char* target)
|
||||
void log_connection(int socket, char* target)
|
||||
{
|
||||
struct sockaddr peeraddr;
|
||||
socklen_t size = sizeof(peeraddr);
|
||||
@ -237,7 +208,7 @@ void log_connexion(int socket, char* target)
|
||||
res = getpeername(socket, &peeraddr, &size);
|
||||
CHECK_RES_DIE(res, "getpeername");
|
||||
|
||||
syslog(LOG_INFO, "connexion from %s forwarded to %s\n",
|
||||
syslog(LOG_INFO, "connection from %s forwarded to %s\n",
|
||||
sprintaddr(buf, sizeof(buf), &peeraddr), target);
|
||||
|
||||
}
|
||||
@ -251,6 +222,36 @@ int timeout = 2;
|
||||
struct sockaddr addr_listen;
|
||||
struct sockaddr addr_ssl, addr_ssh;
|
||||
|
||||
/* libwrap (tcpd): check the ssh connection is legal. This is necessary because
|
||||
* the actual sshd will only see a connection coming from localhost and can't
|
||||
* apply the rules itself.
|
||||
*/
|
||||
void check_access_rights(int in_socket)
|
||||
{
|
||||
#ifdef LIBWRAP
|
||||
struct sockaddr peeraddr;
|
||||
socklen_t size = sizeof(peeraddr);
|
||||
char addr_str[1024];
|
||||
struct hostent *host;
|
||||
struct in_addr addr;
|
||||
int res;
|
||||
|
||||
res = getpeername(in_socket, &peeraddr, &size);
|
||||
CHECK_RES_DIE(res, "getpeername");
|
||||
inet_ntop(AF_INET, &((struct sockaddr_in*)&peeraddr)->sin_addr, addr_str, sizeof(addr_str));
|
||||
|
||||
addr.s_addr = inet_addr(addr_str);
|
||||
host = gethostbyaddr((char *)&addr, sizeof(addr), AF_INET);
|
||||
|
||||
if (!hosts_ctl("sshd", (host ? host->h_name : STRING_UNKNOWN), addr_str, STRING_UNKNOWN)) {
|
||||
if (verbose)
|
||||
fprintf(stderr, "access denied\n");
|
||||
log_connection(in_socket, "access denied");
|
||||
close(in_socket);
|
||||
exit(0);
|
||||
}
|
||||
#endif
|
||||
}
|
||||
|
||||
/* Child process that finds out what to connect to and proxies
|
||||
*/
|
||||
@ -280,9 +281,12 @@ void start_shoveler(int in_socket)
|
||||
/* The client hasn't written anything and we timed out: connect to SSH */
|
||||
saddr = &addr_ssh;
|
||||
target = "SSH";
|
||||
|
||||
/* do hosts_access check if built with libwrap support */
|
||||
check_access_rights(in_socket);
|
||||
}
|
||||
|
||||
log_connexion(in_socket, target);
|
||||
log_connection(in_socket, target);
|
||||
|
||||
/* Connect the target socket */
|
||||
out_socket = socket(AF_INET, SOCK_STREAM, 0);
|
||||
@ -442,7 +446,7 @@ int main(int argc, char *argv[])
|
||||
res = setsid();
|
||||
CHECK_RES_DIE(res, "setsid: already process leader");
|
||||
|
||||
/* Open syslog connexion */
|
||||
/* Open syslog connection */
|
||||
openlog(argv[0], LOG_CONS, LOG_AUTH);
|
||||
|
||||
/* Main server loop: accept connections, find what they are, fork shovelers */
|
||||
|
||||
Loading…
Reference in New Issue
Block a user