mirror of
https://github.com/moparisthebest/sslh
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v1.6: 25APR2009
Added -V, version option.
Install target directory configurable in Makefile
Changed syslog prefix in auth.log to "sslh[%pid]"
Man page
new 'make install' and 'make install-debian' targets
PID file now specified using -P command line option
Actually fixed zombie generation (the v1.5 patch got
lost, doh!)
This commit is contained in:
Yves Rutschle
parent
b965d735b8
commit
0658982705
32
Makefile
32
Makefile
@ -1,23 +1,49 @@
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# Configuration
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VERSION="v1.6i"
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USELIBWRAP=1 # Use libwrap?
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PREFIX=/usr/local
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MAN=sslh.8.gz # man page name
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# End of configuration -- the rest should take care of
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# itself
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CC = gcc
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CFLAGS=-Wall
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#LIBS=-lnet
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LIBS=
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ifneq ($(strip $(USELIBWRAP)),)
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LIBS:=$(LIBS) -lwrap
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CFLAGS=-DLIBWRAP
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CFLAGS:=$(CFLAGS) -DLIBWRAP
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endif
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all:
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$(CC) $(CFLAGS) -o sslh sslh.c $(LIBS)
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all: sslh $(MAN)
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sslh: sslh.c Makefile
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$(CC) $(CFLAGS) -D'VERSION=$(VERSION)' -o sslh sslh.c $(LIBS)
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strip sslh
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$(MAN): sslh.pod Makefile
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pod2man --section=8 --release=$(VERSION) --center=" " sslh.pod | gzip -9 - > $(MAN)
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# generic install: install binary and man page
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install: sslh $(MAN)
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install -D sslh $(PREFIX)/sbin/sslh
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install -D -m 0644 $(MAN) $(PREFIX)/share/man/man8/$(MAN)
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# "extended" install for Debian: install startup script
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install-debian: install sslh $(MAN)
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sed -e "s+^PREFIX=+PREFIX=$(PREFIX)+" scripts/etc.init.d.sslh > /etc/init.d/sslh
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chmod 755 /etc/init.d/sslh
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cp scripts/etc.default.sslh /etc/default/sslh
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update-rc.d sslh defaults
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uninstall:
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rm -f $(PREFIX)/sbin/sslh $(PREFIX)/share/man/man8/$(MAN) /etc/init.d/sslh /etc/default/sslh
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update-rc.d sslh remove
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clean:
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rm -f sslh $(MAN)
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44
README
44
README
@ -1,10 +1,20 @@
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sslh -- A ssl/ssh multiplexer.
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===== sslh -- A ssl/ssh multiplexer. =====
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sslh lets one accept both HTTPS and SSH connections on the
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same port. It makes it possible to connect to an SSH server
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on port 443 (e.g. from inside a corporate firewall) while
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still serving HTTPS on that port.
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==== Compile and install ====
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If you're lucky, the Makefile will work for you:
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make install
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(see below for configuration hints)
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Otherwise:
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Compilation instructions:
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@ -29,18 +39,29 @@ cp sslh /usr/local/sbin
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cp scripts/etc.init.d.sslh /etc/init.d/sslh
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cp scripts/etc.default.sslh /etc/default/sslh
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and probably create links in /etc/rc<x>.d so that the server
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start automatically at boot-up, e.g. under Debian:
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update-rc.d sslh defaults
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==== Configuration ====
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You can edit settings in /etc/default/sslh:
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PIDFILE=/var/run/sslh.pid
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LISTEN=ifname:443
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SSH=localhost:22
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SSL=localhost:443
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A good scheme is to use the external name of the machine in
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$LISTEN, and bind httpd to localhost:443: that way, https
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connections coming from inside your network don't need to go
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through sslh, and sslh is only there as a frontal for
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connections coming from the internet.
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$LISTEN, and bind httpd to localhost:443 (instead of all
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binding to all interfaces): that way, https connections
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coming from inside your network don't need to go through
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sslh, and sslh is only there as a frontal for connections
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coming from the internet.
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==== Libwrap support ====
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Sslh can optionnaly perform libwrap checks for the sshd
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service: because the connection to sshd will be coming
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@ -51,6 +72,17 @@ Comments? questions? sslh@rutschle.net
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HISTORY
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v1.6: 25APR2009
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Added -V, version option.
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Install target directory configurable in Makefile
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Changed syslog prefix in auth.log to "sslh[%pid]"
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Man page
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new 'make install' and 'make install-debian' targets
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PID file now specified using -P command line option
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Actually fixed zombie generation (the v1.5 patch got
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lost, doh!)
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v1.5: 10DEC2008
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Fixed zombie generation.
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Added support scripts (), Makefile.
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@ -1,4 +1,3 @@
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PIDFILE=/var/run/sslh.pid
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LISTEN=ifname:443
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SSH=localhost:22
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SSL=localhost:443
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@ -14,17 +14,18 @@ facility=user.info
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# /etc/init.d/sslh: start and stop the sslh proxy daemon
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# Defaults -- can be overridden in /etc/default/sslh
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PIDFILE=/var/run/sslh.pid
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LISTEN=thelonious:443
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SSH=localhost:22
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SSL=localhost:443
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if test -f /etc/default/sslh; then
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. /etc/default/sslh
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export PIDFILE=${PIDFILE}
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fi
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DAEMON=/usr/local/sbin/sslh
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# The prefix is normally filled by make install. If
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# installing by hand, fill it in yourself!
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PREFIX=
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DAEMON=$PREFIX/sbin/sslh
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start()
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{
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68
sslh.c
68
sslh.c
@ -20,8 +20,7 @@
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*/
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#define VERSION "1.5"
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#define _GNU_SOURCE
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#include <sys/types.h>
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#include <fcntl.h>
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#include <string.h>
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@ -36,6 +35,7 @@
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#include <netdb.h>
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#include <pwd.h>
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#include <syslog.h>
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#include <libgen.h>
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#ifdef LIBWRAP
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#include <tcpd.h>
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@ -50,15 +50,16 @@ if (res == -1) { \
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}
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#define USAGE_STRING \
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"sslh v" VERSION "\n" \
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"sslh " VERSION "\n" \
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"usage:\n" \
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"\texport PIDFILE=/var/run/sslhc.pid\n" \
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"\tsslh [-t <timeout>] -u <username> -p [listenaddr:]<listenport> \n" \
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"\t\t-s [sshhost:]port -l [sslhost:]port [-v]\n\n" \
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"\t\t-s [sshhost:]port -l [sslhost:]port [-P pidfile] [-v] [-V]\n\n" \
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"-v: verbose\n" \
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"-V: version\n" \
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"-p: address and port to listen on. default: 0.0.0.0:443\n" \
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"-s: SSH address: where to connect an SSH connection. default: localhost:22\n" \
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"-l: SSL address: where to connect an SSL connection.\n" \
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"-P: PID file. Default: /var/run/sslh.pid\n" \
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""
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int verbose = 0; /* That's really quite global */
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@ -188,7 +189,7 @@ void resolve_name(struct sockaddr *sock, char* fullname) {
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res = getaddrinfo(host, serv, &hint, &addr);
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if (res) {
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fprintf(stderr, "%s\n", gai_strerror(res));
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fprintf(stderr, "%s `%s'\n", gai_strerror(res), fullname);
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if (res == EAI_SERVICE)
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fprintf(stderr, "(Check you have specified all ports)\n");
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exit(1);
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@ -306,25 +307,31 @@ void start_shoveler(int in_socket)
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exit(0);
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}
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/* SIGCHLD handling:
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* we need to reap our children
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*/
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void child_handler(int signo)
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{
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signal(SIGCHLD, &child_handler);
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wait(NULL);
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}
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void setup_signals(void)
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{
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void* res;
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int res;
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struct sigaction action;
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res = signal(SIGCHLD, &child_handler);
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if (res == SIG_ERR) {
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perror("signal");
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exit(1);
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}
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/* Request no SIGCHLD is sent upon termination of
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* the children */
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memset(&action, 0, sizeof(action));
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action.sa_handler = NULL;
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action.sa_flags = SA_NOCLDWAIT;
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res = sigaction(SIGCHLD, &action, NULL);
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CHECK_RES_DIE(res, "sigaction");
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}
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/* Open syslog connection with appropriate banner;
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* banner is made up of basename(bin_name)+"[pid]" */
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void setup_syslog(char* bin_name) {
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char *name1, *name2;
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name1 = strdup(bin_name);
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asprintf(&name2, "%s[%d]", basename(name1), getpid());
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openlog(name2, LOG_CONS, LOG_AUTH);
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free(name1);
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/* Don't free name2, as openlog(3) uses it (at least in glibc) */
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}
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/* We don't want to run as root -- drop priviledges if required */
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void drop_privileges(char* user_name)
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@ -345,14 +352,10 @@ void drop_privileges(char* user_name)
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}
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/* Writes my PID if $PIDFILE is defined */
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void write_pid_file(void)
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void write_pid_file(char* pidfile)
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{
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char *pidfile = getenv("PIDFILE");
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FILE *f;
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if (!pidfile)
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return;
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f = fopen(pidfile, "w");
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if (!f) {
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perror(pidfile);
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@ -391,12 +394,13 @@ int main(int argc, char *argv[])
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char listen_str[] = "0.0.0.0:443";
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char ssl_str[] = "localhost:442";
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char ssh_str[] = "localhost:22";
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char *pid_file = "/var/run/sslh.pid";
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resolve_name(&addr_listen, listen_str);
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resolve_name(&addr_ssl, ssl_str);
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resolve_name(&addr_ssh, ssh_str);
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while ((c = getopt(argc, argv, "t:l:s:p:vu:")) != EOF) {
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while ((c = getopt(argc, argv, "t:l:s:p:P:vVu:")) != EOF) {
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switch (c) {
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case 't':
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@ -419,10 +423,18 @@ int main(int argc, char *argv[])
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verbose += 1;
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break;
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case 'V':
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printf("sslh %s\n", VERSION);
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exit(0);
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case 'u':
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user_name = optarg;
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break;
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case 'P':
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pid_file = optarg;
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break;
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default:
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fprintf(stderr, USAGE_STRING);
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exit(2);
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@ -438,7 +450,7 @@ int main(int argc, char *argv[])
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if (fork() > 0) exit(0); /* Detach */
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write_pid_file();
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write_pid_file(pid_file);
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drop_privileges(user_name);
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@ -447,7 +459,7 @@ int main(int argc, char *argv[])
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CHECK_RES_DIE(res, "setsid: already process leader");
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/* Open syslog connection */
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openlog(argv[0], LOG_CONS, LOG_AUTH);
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setup_syslog(argv[0]);
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/* Main server loop: accept connections, find what they are, fork shovelers */
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while (1)
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128
sslh.pod
Normal file
128
sslh.pod
Normal file
@ -0,0 +1,128 @@
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# I'm just not gonna write troff :-)
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=head1 NAME
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sslh - ssl/ssh multiplexer
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=head1 SYNOPSIS
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sslh [ B<-t> I<num> ] [B<-p> I<listening address>] [B<-l> I<target address for SSL>] [B<-s> I<target address for SSH>] [B<-u> I<username>] [B<-P> I<pidfile>] [-v] [-V]
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=head1 DESCRIPTION
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B<sslh> lets one accept both HTTPS and SSH connections on
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the same port. It makes it possible to connect to an SSH
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server on port 443 (e.g. from inside a corporate firewall,
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which almost never block port 443) while still serving HTTPS
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on that port.
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The idea is to have B<sslh> listen to the external 443 port,
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accept the incoming connections, work out what type of
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connection it is, and then fordward to the appropriate
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server.
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=head2 Protocol detection
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The protocol detection is made based on a small difference
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between SSL and SSH: an SSL client connecting to a server
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speaks first, whereas an SSH client expects the SSH server
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to speak first (announcing itself with a banner). B<sslh>
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waits for some time for the incoming connection to send data.
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If it does before the timeout occurs, it is supposed to be
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an SSL connection. Otherwise, it is supposed to be an SSH
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connection.
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=head2 Libwrap support
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One drawback of B<sslh> is that the B<ssh> and B<httpd>
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servers do not see the original IP address of the client
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anymore, as the connection is forwarded through B<sslh>.
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B<sslh> provides enough logging to circumvent that problem.
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However it is common to limit access to B<ssh> using
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B<libwrap> or B<tcpd>. For this reason, B<sslh> can be
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compiled to check SSH accesses against SSH access lists as
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defined in F</etc/hosts.allow> and F</etc/hosts.deny>.
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=head1 OPTIONS
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=over 4
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=item B<-t> I<num>
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Timeout before a connection is considered to be SSH. Default
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is 2s.
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=item B<-p> I<listening address>
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Interface and port on which to listen, e.g. I<foobar:443>,
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where I<foobar> is the name of an interface (typically the
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IP address on which the Internet connection ends up).
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Defaults to I<0.0.0.0:443> (listen to port 443 on all
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available interfaces).
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=item B<-l> I<target address for SSL>
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Interface and port on which to forward SSL connection,
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typically I<localhost:443>.
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Defaults to I<localhost:442> (this assumes you would
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configure your B<httpd> process to listen to port 443).
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Note that you can set B<sslh> to listen on I<ext_ip:443> and
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B<httpd> to listen on I<localhost:443>: this allows clients
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inside your network to just connect directly to B<httpd>.
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=item B<-s> I<target address for SSH>
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Interface and port on which to forward SSH connection,
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defaults to I<localhost:22>.
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=item B<-v>
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Increase verboseness.
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=item B<-V>
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Prints B<sslh> version.
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=item B<-u> I<username>
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Requires to run under the specified username. Defaults to
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I<nobody> (which is not perfect -- ideally B<sslh> should
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run under its own UID).
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=item B<-P> I<pidfile>
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Specifies the file in which to write the PID of the main
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server. Defaults to I</var/run/sslh.pid>.
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=back
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=head1 FILES
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=over 4
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=item F</etc/init.d/sslh>
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Start-up script. The standard actions B<start>, B<stop> and
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B<restart> are supported.
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=item F</etc/default/sslh>
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Server configuration. These are environement variables
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loaded by the start-up script and passed to B<sslh> as
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command-line arguments. Refer to the OPTIONS section for a
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detailed explanation of the variables used by B<sslh>.
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=back
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=head1 SEE ALSO
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Last version available from
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L<http://www.rutschle.net/tech/sslh>, and can be tracked
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from L<http://freshmeat.net/projects/sslh/>.
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=head1 AUTHOR
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Written by Yves Rutschle
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