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[stunnel patch] updated transparent proxy on linux 2.6 using cttproxy patch
by MAtteo HCE Valsasna 26 Aug '05

26 Aug '05

hello folks, here comes an improved version of the transparent proxy patch, basically solving the previous TODO issues. please try it if you are interested in transparent stunnel. any feedback il welcome. the code is heavly based on the examples distributed along with the cttproxy patch, many thanks to Balzs Scheidler for its great work and to Lennert Buytenhek for the skaidrus example program. this code is (re)distributed under the GPL version 2 MAtteo ---README--- cttproxy patch to stunnel MAtteo HCE Valsasna (matteo dot valsasna at uninsubria dot it) based on example code in cttproxy patch ports stunnel transparent proxy to cttproxy kernel patch allow stunnel server to connect to the application server faking the stunnel client's IP source address. the server sees connections coming from the stunnel client's IP address instead of that of the stunnel server, and thus can apply admission control, bandwidth control, logging policies as if the client connected directly. should work 2.4 and 2.6 kernels and 2.0.x cttproxy patch tested with kernel 2.6.12.5 and cttproxy-2.6.12-2.0.2 patch setup: * application server(s): here run the application(s) you want to access trough stunnel must route all traffic, or at least all traffic for transproxyed connections, trough the stunnel server * stunnel server: must not be the same host as the application server grab recent kernel source patch your kernel source with the appropriate cttproxy patch (from http://www.balabit.com/products/oss/tproxy/) configure kernel with: CONFIG_IP_NF_TPROXY=m CONFIG_IP_NF_MATCH_TPROXY=m CONFIG_IP_NF_TARGET_TPROXY=m make and install kernel reboot and choose patched kernel load tproxy kernel modules # modprobe iptable_tproxy # modprobe ipt_tproxy enable ip forwarding (this must act as a router) # echo 1 > /proc/sys/net/ipv4/ip_forward grab stunnel source and extract it $ tar xzf stunnel-4.11.tar.gz patch it $ patch -p0 < cttproxy.patch configure selecting tproxy support $ ./configure --enable-tproxy make and install $ make # make install run stunnel in server mode with transparent = yes remote = <application server>:<port> in conf file * stunnel client run plain stunnel, client = yes remote = stunnel server * application client may or may not be the same host as the stunnel client connect to stunnel client to talk securely to application server ---PATCH---diff -crb /tmp/stunnel-4.11/configure stunnel-4.11/configure *** /tmp/stunnel-4.11/configure 2005-07-09 23:00:44.000000000 +0200 --- stunnel-4.11/configure 2005-08-25 16:59:57.000000000 +0200 *************** *** 463,469 **** # include <unistd.h> #endif" ! ac_subst_vars='SHELL PATH_SEPARATOR PACKAGE_NAME PACKAGE_TARNAME PACKAGE_VERSION PACKAGE_STRING PACKAGE_BUGREPORT exec_prefix prefix program_transform_name bindir sbindir libexecdir datadir sysconfdir sharedstatedir localstatedir libdir includedir oldincludedir infodir mandir build_alias host_alias target_alias DEFS ECHO_C ECHO_N ECHO_T LIBS INSTALL_PROGRAM INSTALL_SCRIPT INSTALL_DATA CYGPATH_W PACKAGE VERSION ACLOCAL AUTOCONF AUTOMAKE AUTOHEADER MAKEINFO install_sh STRIP ac_ct_STRIP INSTALL_STRIP_PROGRAM mkdir_p AWK SET_MAKE am__leading_dot AMTAR am__tar am__untar build build_cpu build_vendor build_os host host_cpu host_vendor host_os CC CFLAGS LDFLAGS CPPFLAGS ac_ct_CC EXEEXT OBJEXT DEPDIR am__include am__quote AMDEP_TRUE AMDEP_FALSE AMDEPBACKSLASH CCDEPMODE am__fastdepCC_TRUE am__fastdepCC_FALSE EGREP LN_S ECHO AR ac_ct_AR RANLIB ac_ct_RANLIB CPP CXX CXXFLAGS ac_ct_CXX CXXDEPMODE am__fastdepCXX_TRUE am__fastdepCXX_FALSE CXXCPP F77 FFLAGS ac_ct_F77 LIBTOOL ssldir RANDOM_FILE USE_DH USE_IPv6 LIBOBJS LTLIBOBJS' ac_subst_files='' # Initialize some variables set by options. --- 463,469 ---- # include <unistd.h> #endif" ! ac_subst_vars='SHELL PATH_SEPARATOR PACKAGE_NAME PACKAGE_TARNAME PACKAGE_VERSION PACKAGE_STRING PACKAGE_BUGREPORT exec_prefix prefix program_transform_name bindir sbindir libexecdir datadir sysconfdir sharedstatedir localstatedir libdir includedir oldincludedir infodir mandir build_alias host_alias target_alias DEFS ECHO_C ECHO_N ECHO_T LIBS INSTALL_PROGRAM INSTALL_SCRIPT INSTALL_DATA CYGPATH_W PACKAGE VERSION ACLOCAL AUTOCONF AUTOMAKE AUTOHEADER MAKEINFO install_sh STRIP ac_ct_STRIP INSTALL_STRIP_PROGRAM mkdir_p AWK SET_MAKE am__leading_dot AMTAR am__tar am__untar build build_cpu build_vendor build_os host host_cpu host_vendor host_os CC CFLAGS LDFLAGS CPPFLAGS ac_ct_CC EXEEXT OBJEXT DEPDIR am__include am__quote AMDEP_TRUE AMDEP_FALSE AMDEPBACKSLASH CCDEPMODE am__fastdepCC_TRUE am__fastdepCC_FALSE CPP LN_S RANLIB ac_ct_RANLIB EGREP ECHO AR ac_ct_AR CXX CXXFLAGS ac_ct_CXX CXXDEPMODE am__fastdepCXX_TRUE am__fastdepCXX_FALSE CXXCPP F77 FFLAGS ac_ct_F77 LIBTOOL ssldir RANDOM_FILE USE_DH USE_IPv6 USE_TPROXY LIBOBJS LTLIBOBJS' ac_subst_files='' # Initialize some variables set by options. *************** *** 1037,1042 **** --- 1037,1043 ---- --disable-rsa Disable RSA support --enable-dh Enable DH support --enable-ipv6 Enable IPv6 support + --enable-tproxy Enable linux 2.6 tproxy patch support --disable-libwrap Disable TCP wrappers library support Optional Packages: *************** *** 23166,23171 **** --- 23344,23367 ---- fi; + # use linux 2.[46] tproxy patch + echo "$as_me:$LINENO: checking whether to enable transparent proxyng using linux 2.46 tproxy patch" >&5 + echo $ECHO_N "checking whether to enable transparent proxyng using linux 2.46 tproxy patch... $ECHO_C" >&6 + # Check whether --enable-tproxy or --disable-tproxy was given. + if test "${enable_tproxy+set}" = set; then + enableval="$enable_tproxy" + echo "$as_me:$LINENO: result: yes" >&5 + echo "${ECHO_T}yes" >&6; cat >>confdefs.h <<\_ACEOF + #define USE_TPROXY 1 + _ACEOF + + else + echo "$as_me:$LINENO: result: no" >&5 + echo "${ECHO_T}no" >&6 + + fi; + + # Disable use of libwrap (TCP wrappers) # it should be the last check! echo "$as_me:$LINENO: checking whether to disable TCP wrappers library support" >&5 *************** *** 23987,23992 **** --- 24184,24190 ---- s,@RANDOM_FILE@,$RANDOM_FILE,;t t s,@USE_DH@,$USE_DH,;t t s,@USE_IPv6@,$USE_IPv6,;t t + s,@USE_TPROXY@,$USE_TPROXY,;t t s,@LIBOBJS@,$LIBOBJS,;t t s,@LTLIBOBJS@,$LTLIBOBJS,;t t CEOF diff -crb /tmp/stunnel-4.11/configure.ac stunnel-4.11/configure.ac *** /tmp/stunnel-4.11/configure.ac 2005-07-09 22:58:05.000000000 +0200 --- stunnel-4.11/configure.ac 2005-08-25 16:56:33.000000000 +0200 *************** *** 14,21 **** --- 14,24 ---- if test "$GCC" = "yes" then CFLAGS="$CFLAGS -Wall -Wshadow -Wcast-align -Wpointer-arith" fi + AC_PROG_CPP AC_PROG_INSTALL + AC_PROG_LN_S AC_PROG_MAKE_SET + AC_PROG_RANLIB # Checks for typedefs, structures, and compiler characteristics # AC_C_CONST *************** *** 254,259 **** --- 257,271 ---- ) AC_SUBST(USE_IPv6) + # use linux 2.[46] tproxy patch + AC_MSG_CHECKING([whether to enable transparent proxyng using linux 2.[46] tproxy patch]) + AC_ARG_ENABLE(tproxy, + [ --enable-tproxy Enable linux 2.6 tproxy patch support], + [AC_MSG_RESULT([yes]); AC_DEFINE(USE_TPROXY)], + [AC_MSG_RESULT([no])] + ) + AC_SUBST(USE_TPROXY) + # Disable use of libwrap (TCP wrappers) # it should be the last check! AC_MSG_CHECKING([whether to disable TCP wrappers library support]) diff -crb /tmp/stunnel-4.11/src/client.c stunnel-4.11/src/client.c *** /tmp/stunnel-4.11/src/client.c 2005-07-02 08:55:58.000000000 +0200 --- stunnel-4.11/src/client.c 2005-08-26 16:01:34.000000000 +0200 *************** *** 44,49 **** --- 44,65 ---- #define SHUT_RDWR 2 #endif + #ifdef USE_TPROXY + #define LINUX_NETFILTER + #define LINUX_TPROXY + #define TPROXY_MAJOR_VERSION(x) ((x >> 24) & 0xff) + #define TPROXY_MINOR_VERSION(x) ((x >> 16) & 0xff) + #define TPROXY_PATCH_VERSION(x) (x & 0xffff) + #endif + + /* transparent proxy */ + #ifdef LINUX_NETFILTER + #include <linux/netfilter_ipv4.h> + #endif + #ifdef LINUX_TPROXY + #include <linux/netfilter_ipv4/ip_tproxy.h> + #endif + /* TCP wrapper */ #ifdef USE_LIBWRAP #include <tcpd.h> *************** *** 77,82 **** --- 93,103 ---- static int connect_wait(CLI *, int, int); static void reset(int, char *); + #ifdef USE_TPROXY + static int determine_source_address(struct sockaddr_in *destination, + struct sockaddr_in *source); + #endif + int max_clients; #ifndef USE_WIN32 int max_fds; *************** *** 921,926 **** --- 942,954 ---- int s; /* destination socket */ u16 i; + // struct in_addr *local=NULL; + #ifdef USE_TPROXY + int f; + struct in_tproxy itp; + struct sockaddr_in tproxy_sin; + #endif + /* setup address_list */ if(c->opt->option.delayed_lookup) { resolved_list.num=0; *************** *** 945,959 **** if(alloc_fd(s)) return -1; ! if(c->bind_addr.num) { /* explicit local bind or transparent proxy */ memcpy(&bind_addr, &c->bind_addr.addr[0], sizeof(SOCKADDR_UNION)); if(bind(s, &bind_addr.sa, addr_len(bind_addr))<0) { sockerror("bind transparent"); closesocket(s); return -1; } } /* try to connect for the 1st time */ s_ntop(c->connecting_address, &addr); s_log(LOG_DEBUG, "%s connecting %s", --- 973,1066 ---- if(alloc_fd(s)) return -1; ! if(c->bind_addr.num ! #ifdef USE_TPROXY ! /* if we're using the tproxy patch, transparent proxy is ! handled below */ ! && !c->opt->option.transparent ! #endif ! ) { ! /* explicit local bind, not tproxy transparent mode */ ! memcpy(&bind_addr, &c->bind_addr.addr[0], sizeof(SOCKADDR_UNION)); if(bind(s, &bind_addr.sa, addr_len(bind_addr))<0) { sockerror("bind transparent"); closesocket(s); return -1; } + sockerror("local bind succeeded"); } + #ifdef USE_TPROXY + if (c->opt->option.transparent){ + /* transparent proxy support on 2.[46] linux kernels */ + /* added by MAtteo HCE Valsasna (matteo.valsasna(a)uninsubria.it), 20050826 */ + /* requires tproxy kernel patch (http://www.balabit.com/products/oss/tproxy */ + /* based on examples in cttproxy patch */ + /* this patch is released under the GNU General Public Licence, Version 2 */ + + memcpy(&bind_addr, &c->bind_addr.addr[0], sizeof(SOCKADDR_UNION)); + + /* check tproxy version */ + itp.op = TPROXY_VERSION; + itp.v.version = 0x00000000; + + getsockopt(s, SOL_IP, IP_TPROXY, &itp, &f); + s_log(LOG_NOTICE, "TPROXY_VERSION: %d.%d.%d", + TPROXY_MAJOR_VERSION(itp.v.version), + TPROXY_MINOR_VERSION(itp.v.version), + TPROXY_PATCH_VERSION(itp.v.version)); + + /* conservative: accepting only tproxy version 2.0.x */ + if (TPROXY_MAJOR_VERSION(itp.v.version) != 2 || + TPROXY_MINOR_VERSION(itp.v.version) != 0) + { + s_log(LOG_ERR, "unsupported tproxy version: %x (2.0.x required)", itp.v.version); + return -1; + } + + tproxy_sin.sin_family = AF_INET; + if (determine_source_address(&addr.in, &tproxy_sin) < 0){ + sockerror("determine_source_address"); + return -1; + } + + /* do not request a specific source port */ + tproxy_sin.sin_port = htons(0); + + /* bind to local source address */ + /* needed for tproxy magic */ + if (bind(s, (struct sockaddr *) &tproxy_sin, sizeof(tproxy_sin)) == -1) + { + sockerror("bind"); + return -1; + } + s_log(LOG_NOTICE, "bound to local: %s", inet_ntoa(tproxy_sin.sin_addr)); + + /* assign foreign address */ + itp.op = TPROXY_ASSIGN; + itp.v.addr.faddr = bind_addr.in.sin_addr; + itp.v.addr.fport = 0; + + if (setsockopt(s, SOL_IP, IP_TPROXY, &itp, sizeof(itp)) == -1) + { + s_log(LOG_NOTICE, "error assigning foreign address: %s", inet_ntoa(bind_addr.in.sin_addr)); + sockerror("setsockopt(SOL_IP, IP_TPROXY, TPROXY_ASSIGN)"); + return -1; + } + s_log(LOG_NOTICE, "assigned foreign address: %s", inet_ntoa(bind_addr.in.sin_addr)); + + /* set connect flag on socket */ + itp.op = TPROXY_FLAGS; + itp.v.flags = ITP_CONNECT|ITP_ONCE; + if (setsockopt(s, SOL_IP, IP_TPROXY, &itp, sizeof(itp)) == -1) + { + sockerror("setsockopt(SOL_IP, IP_TPROXY, TPROXY_FLAGS)"); + return -1; + } + } + #endif + /* try to connect for the 1st time */ s_ntop(c->connecting_address, &addr); s_log(LOG_DEBUG, "%s connecting %s", *************** *** 1020,1023 **** --- 1127,1175 ---- log_error(LOG_DEBUG, get_last_socket_error(), txt); } + + #ifdef USE_TPROXY + + /* from skaidrus */ + static int determine_source_address(struct sockaddr_in *destination, + struct sockaddr_in *source) + { + struct sockaddr_in addr; + socklen_t addrlen; + char textaddr[32]; + int sock; + + sock = socket(AF_INET, SOCK_DGRAM, 0); + if (sock < 0) { + syslog(LOG_CRIT, "determine_source_address: error " + "%d while creating socket", errno); + abort(); + } + + addr = *destination; + addr.sin_port = htons(80); + if (connect(sock, (struct sockaddr *)&addr, sizeof(addr)) < 0) { + syslog(LOG_ALERT, "determine_source_address: error %d " + "while looking up route for %d", errno, + inet_aton(textaddr, &(addr.sin_addr))); + close(sock); + return -1; + } + + addrlen = sizeof(*source); + if (getsockname(sock, (struct sockaddr *)source, &addrlen) < 0) { + syslog(LOG_CRIT, "determine_source_address: error %d " + "while retrieving source address", errno); + abort(); + } + source->sin_port = 0; + + close(sock); + + return 0; + } + + #endif + + /* End of client.c */

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RE: stunnel and OpenSSL v0.9.8 - tunneling the UDP. Possible?
by rz1a＠mail.ru 22 Aug '05

22 Aug '05

Hello Michal, Just one thought: - if the stunnel on LAN1 joins a group to receive a multicasted stream does it really depend on DTLS's [in]ability to handle the multicasting? I see it this way - on LAN1 a machine running the (first instance of) stunnel joins a group, i.e. stunnel is told to open a socket with all the relevant socket options. Then, another machine on LAN2 (behind NAT + firewall + internet + firewall + NAT) connects to the first stunnel and tells it's own instance of stunnel to open a socket with all the relevant socket options to emit the (apparently) multicasted stream. Please comment. -- Best regards, Tony

2 2

[stunnel patch] transparent proxy on linux 2.6 using cttproxy patch
by MAtteo HCE Valsasna 22 Aug '05

22 Aug '05

hi folks: as suggested in http://www.stunnel.org/faq/transparent.html#ToC3, I modified the stunnel code to use the transparent proxy funcionality on 2.6 (and possibly 2.4) linux kernels with the cttproxy patch (http://www.balabit.com/products/oss/tproxy/, I used )cttproxy-2.6.12-2.0.2. on a clean 2.6.12.5 kernel) the patch is higly incomplete, but it works (see TODO). please try it if you are interested in transparent stunnel. any feedback il welcome. MAtteo the code is heavly based on the examples distributed along with the cttproxy patch, many thanks to Balázs Scheidler for its great work and for making it GPL. with this patch, I was able to run a stunnel in server mode with the transparent option, and the application server I connected to saw the IP address of the stunnel client. of course, this code il also redistributed under the GPL. conditions for running stunnel in transparent mode: if you want to try this patch, you MUST modify the hardcoded IP address in client.c to the IP address of the stunnel server (look for DOIT! in the source code). any improvements wellcome. the stunnel server must run a linux kernel patched with the cttproxy patch the stunnel server and the application server cannot be the same host the application server must believe that it has to route all packets of transparently tunneled connections via the stunnel server. thus the two server should be on the same subnet. I was also able to use linux policy routing to avoid modifying the general routing on the application server: transparently tunneled connections are directed to a different IP on the application server, where a policy rule applies a specific routing table to packets with that source address (see at the end of this message). TODO: stunnel must explicitly bind to an *existing* local address (not loopback) before calling setsockopt(SOL_IP, IP_TPROXY, TPROXY_ASSIGN)"). now the address is hardcoded in the patch, it should automatically find a local address to bind to (or get it from the config file) now the code will only run with tproxy patch version 2.0.2 it should be less strict about tproxy version (make it a configurable option in stunnel?). which tproxy version will it run with? auto detect or configure kernel version (2.2 vs 2.4 or 2.6 with cttproxy), or better add it in .configure ----begin patch----- *** /tmp/stunnel-4.11/src/client.c 2005-07-02 08:55:58.000000000 +0200 --- stunnel-4.11/src/client.c 2005-08-22 12:19:57.000000000 +0200 *************** *** 44,49 **** --- 44,60 ---- #define SHUT_RDWR 2 #endif + #define LINUX_NETFILTER + #define LINUX_TPROXY + + /* transparent proxy */ + #ifdef LINUX_NETFILTER + #include <linux/netfilter_ipv4.h> + #endif + #ifdef LINUX_TPROXY + #include <linux/netfilter_ipv4/ip_tproxy.h> + #endif + /* TCP wrapper */ #ifdef USE_LIBWRAP #include <tcpd.h> *************** *** 921,926 **** --- 932,944 ---- int s; /* destination socket */ u16 i; + // struct in_addr *local=NULL; + #ifdef LINUX_TPROXY + int f; + struct in_tproxy itp; + struct sockaddr_in tproxy_sin; + #endif + /* setup address_list */ if(c->opt->option.delayed_lookup) { resolved_list.num=0; *************** *** 945,960 **** if(alloc_fd(s)) return -1; ! if(c->bind_addr.num) { /* explicit local bind or transparent proxy */ ! memcpy(&bind_addr, &c->bind_addr.addr[0], sizeof(SOCKADDR_UNION)); ! if(bind(s, &bind_addr.sa, addr_len(bind_addr))<0) { ! sockerror("bind transparent"); ! closesocket(s); ! return -1; ! } ! } ! ! /* try to connect for the 1st time */ s_ntop(c->connecting_address, &addr); s_log(LOG_DEBUG, "%s connecting %s", c->opt->servname, c->connecting_address); --- 963,1053 ---- if(alloc_fd(s)) return -1; ! if(c->bind_addr.num && !c->opt->option.transparent) { ! /* explicit local bind, not transparent mode */ ! ! memcpy(&bind_addr, &c->bind_addr.addr[0], sizeof(SOCKADDR_UNION)); ! if(bind(s, &bind_addr.sa, addr_len(bind_addr))<0) { ! sockerror("bind transparent"); ! closesocket(s); ! return -1; ! } ! sockerror("local bind succeeded"); ! } ! ! if (c->opt->option.transparent){ ! ! /* transparent proxy support on 2.[46] linux kernels */ ! /* added by MAtteo HCE Valsasna (matteo.valsasna(a)uninsubria.it), 20050822 */ ! /* requires tproxy kernel patch (http://www.balabit.com/products/oss/tproxy */ ! /* based on examples in cttproxy patch */ ! ! /* FIXME: should detect 2.2 kernel or 2.[46] + cttproxy patch and use appropriate code */ ! ! memcpy(&bind_addr, &c->bind_addr.addr[0], sizeof(SOCKADDR_UNION)); ! ! /* check tproxy version */ ! itp.op = TPROXY_VERSION; ! itp.v.version = 0x00000000; ! ! getsockopt(s, SOL_IP, IP_TPROXY, &itp, &f); ! s_log(LOG_NOTICE, "pre getsockopt(s, SOL_IP, IP_TPROXY): %x", itp.v.version); ! ! /* FIXME: should accept a range of tproxy versions - which? */ ! ! if (itp.v.version != 0x02000002) { ! itp.v.version = 0x02000002; ! if (setsockopt(s, SOL_IP, IP_TPROXY, &itp, sizeof(itp)) == -1) ! { ! sockerror("setsockopt(SOL_IP, IP_TPROXY, TPROXY_VERSION)"); ! getsockopt(s, SOL_IP, IP_TPROXY, &itp, &f); ! s_log(LOG_NOTICE, "err getsockopt(s, SOL_IP, IP_TPROXY): %x", itp.v.version); ! return -1; ! } ! } ! else{ ! s_log(LOG_NOTICE, "getsockopt(SOL_IP, IP_TPROXY, TPROXY_VERSION) returned right version"); ! } ! ! /* bind to local address */ ! /* FIXME: must become dynamic */ ! tproxy_sin.sin_family = AF_INET; ! /* DOIT! add a local IP address here */ ! inet_aton("192.168.179.71", &tproxy_sin.sin_addr); ! /* do not request a specific source port */ ! tproxy_sin.sin_port = htons(0); ! ! if (bind(s, (struct sockaddr *) &tproxy_sin, sizeof(tproxy_sin)) == -1) ! { ! sockerror("bind"); ! return -1; ! } ! s_log(LOG_NOTICE, "bound to local: %s", inet_ntoa(tproxy_sin.sin_addr)); ! ! /* assign foreign address */ ! itp.op = TPROXY_ASSIGN; ! itp.v.addr.faddr = bind_addr.in.sin_addr; ! itp.v.addr.fport = 0; ! ! if (setsockopt(s, SOL_IP, IP_TPROXY, &itp, sizeof(itp)) == -1) ! { ! s_log(LOG_NOTICE, "error assigning foreign address: %s", inet_ntoa(bind_addr.in.sin_addr)); ! sockerror("setsockopt(SOL_IP, IP_TPROXY, TPROXY_ASSIGN)"); ! return -1; ! } ! s_log(LOG_NOTICE, "assigned foreign address: %s", inet_ntoa(bind_addr.in.sin_addr)); ! ! /* set connect flag on socket */ ! itp.op = TPROXY_FLAGS; ! itp.v.flags = ITP_CONNECT|ITP_ONCE; ! if (setsockopt(s, SOL_IP, IP_TPROXY, &itp, sizeof(itp)) == -1) ! { ! sockerror("setsockopt(SOL_IP, IP_TPROXY, TPROXY_FLAGS)"); ! return -1; ! } ! } ! ! /* try to connect for the 1st time */ s_ntop(c->connecting_address, &addr); s_log(LOG_DEBUG, "%s connecting %s", c->opt->servname, c->connecting_address); ----end patch----- EXTRAS source routing on the application server intended usage: the application server is a squid proxy with pubblic adresses. its default gw is an HW-based router (not the transparent stunnel server). we want normal traffic (i.e. not handled by transparent stunnel) to continue to use normal routing. only traffic handled by stunnel should be routed back to the stunnel server. a new IP address (10.0.0.1) is added on the application server specifically for this purpose. stunnel server will forward connections to this address, normal clients will use another address. then, only traffic originating from this address needs to be routed back to the stunnel server. the stunnel server has IP 10.0.0.254 (but it can have more, of course) in /etc/iproute2/rt_tables add a line defining a new routing table: 10 inr.tproxy # add a rule to the new routing table ip r a table inr.tproxy default via 10.0.0.254 # create ip policy routing rule: packets with source address = # 10.0.0.1 should be routed according to the inr.tproxy table ip rule add type unicast from 10.0.0.1 table inr.tproxy priority 220 # apply policy routing changes ip route flush cache

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RE: stunnel and OpenSSL v0.9.8 - tunneling the UDP. Possible?
by rz1a＠mail.ru 20 Aug '05

20 Aug '05

Hello Michal, OK. Securing a plain UDP will suffice at first! Are there any plans to use DTLS? Thank you in advance. -- Best regards, Tony

1 0

stunnel and OpenSSL v0.9.8 - tunneling the UDP. Possible?
by rz1a＠mail.ru 19 Aug '05

19 Aug '05

Hello stunnel-users, OpenSSL from v0.9.8 onwards (I'm told) supports a thing called DTLS. On the OpenSSL's list I was told that it's the tool one needs to use for UDP tunneling. Are there any plans to use this OpenSSL's functionality in the stunnel? I need to securely tunnel the UDP traffic, namely multicasted datagramms. -- Best regards, Tony.

2 1

stunnel on windows
by Paul Cottingham 19 Aug '05

19 Aug '05

Folks, I'm in need of some help in setting up stunnel on windows, I get either Error reading certificate file: {path}/stunnel.pem {path}/stunnel.pem: No such process (3) So I am assuming the second error {path}/stunnel.pem: No such process (3) the path statement is correct and therefore something else is not correct but I have no idea where and what Regards Paul

1 0

Stunnel HTTPS Client Issue
by Salar Madadi 19 Aug '05

19 Aug '05

Hello, We are having a problem with our application using STUNNEL and are stuck. I have detailed the issue below with more detailed info about our setup. I am not very familiar with the SSL protocol so I am having trouble identifying the differences between the log samples I posted to determine what the issue may be. Any help would be greatly appreciated. Thanks, Salar Madadi - Latest Developments Inc. Problem Description ************************************ We are using Stunnel to provide an HTTPS client for use with the UPS ShipXML service. Our application is an xBase++ 1.82 service using the XB2.NET library, running on a windows 2003 server. The application opens a connection to stunnel, which then connects to the UPS https server to send and retrieve an xml response with shipping data. UPS made a change to their service last week related to load balancing and our application has not worked since then. When we send an XML document to UPS we receive the exact same XML document back as if it has been bounced instead of the proper response. Our setup was working until they made the change and they have no idea what is going on. Stunnel Version ***************************************** The problem initially happened with stunnel v. 4.05 and openSSL v. 0.9.7c. I have also tried it with stunnel v. 4.11 and openSSL v. 0.9.7f and the same result occurs. Stunnel.conf settings *********************************** #Stunnel server configuration file key=stunnel.pem #up this number to 7 to get full log details #leave it at 3 to just get critical error messages debug=7 output=test.log client=yes verify=0 [psuedo-https] accept = 8080 connect = www.ups.com:443 TIMEOUTclose = 0 Stunnel log samples ************************************** Here are some log samples. The first is a log sample of when it was working. The second is one when it stopped working and the third is from when it was still not working using the latest version of stunnel/openssl. LOG 1 - Working 2005.05.24 23:37:39 LOG7[184:2796]: psuedo-https accepted FD=216 from 127.0.0.1:3349 2005.05.24 23:37:39 LOG7[184:2796]: FD 216 in non-blocking mode 2005.05.24 23:37:39 LOG7[184:2796]: Creating a new thread 2005.05.24 23:37:39 LOG7[184:2796]: New thread created 2005.05.24 23:37:39 LOG7[184:1840]: psuedo-https started 2005.05.24 23:37:39 LOG5[184:1840]: psuedo-https connected from 127.0.0.1:3349 2005.05.24 23:37:39 LOG7[184:1840]: FD 208 in non-blocking mode 2005.05.24 23:37:39 LOG7[184:1840]: psuedo-https connecting 153.2.228.50:443 2005.05.24 23:37:39 LOG7[184:1840]: remote connect #1: EWOULDBLOCK: retrying 2005.05.24 23:37:39 LOG7[184:1840]: waitforsocket: FD=208, DIR=write 2005.05.24 23:37:39 LOG7[184:1840]: waitforsocket: ok 2005.05.24 23:37:39 LOG7[184:1840]: Remote FD=208 initialized 2005.05.24 23:37:39 LOG7[184:1840]: SSL state (connect): before/connect initialization 2005.05.24 23:37:39 LOG7[184:1840]: SSL state (connect): SSLv3 write client hello A 2005.05.24 23:37:39 LOG7[184:1840]: waitforsocket: FD=208, DIR=read 2005.05.24 23:37:39 LOG7[184:1840]: waitforsocket: ok 2005.05.24 23:37:39 LOG7[184:1840]: SSL state (connect): SSLv3 read server hello A 2005.05.24 23:37:39 LOG5[184:1840]: VERIFY IGNORE: depth=1, /C=US/O=RSA Data Security, Inc./OU=Secure Server Certification Authority 2005.05.24 23:37:39 LOG5[184:1840]: VERIFY IGNORE: depth=1, /C=US/O=RSA Data Security, Inc./OU=Secure Server Certification Authority 2005.05.24 23:37:39 LOG5[184:1840]: VERIFY IGNORE: depth=0, /C=US/ST=New Jersey/L=Mahwah/O=United Parcel Service/OU=Internet Systems/CN=www.ups.com 2005.05.24 23:37:39 LOG7[184:1840]: SSL state (connect): SSLv3 read server certificate A 2005.05.24 23:37:39 LOG7[184:1840]: SSL state (connect): SSLv3 read server done A 2005.05.24 23:37:39 LOG7[184:1840]: SSL state (connect): SSLv3 write client key exchange A 2005.05.24 23:37:39 LOG7[184:1840]: SSL state (connect): SSLv3 write change cipher spec A 2005.05.24 23:37:39 LOG7[184:1840]: SSL state (connect): SSLv3 write finished A 2005.05.24 23:37:39 LOG7[184:1840]: SSL state (connect): SSLv3 flush data 2005.05.24 23:37:39 LOG7[184:1840]: waitforsocket: FD=208, DIR=read 2005.05.24 23:37:39 LOG7[184:1840]: waitforsocket: ok 2005.05.24 23:37:39 LOG7[184:1840]: SSL state (connect): SSLv3 read finished A 2005.05.24 23:37:39 LOG7[184:1840]: 3 items in the session cache 2005.05.24 23:37:39 LOG7[184:1840]: 3 client connects (SSL_connect()) 2005.05.24 23:37:39 LOG7[184:1840]: 3 client connects that finished 2005.05.24 23:37:39 LOG7[184:1840]: 0 client renegotiatations requested 2005.05.24 23:37:39 LOG7[184:1840]: 0 server connects (SSL_accept()) 2005.05.24 23:37:39 LOG7[184:1840]: 0 server connects that finished 2005.05.24 23:37:39 LOG7[184:1840]: 0 server renegotiatiations requested 2005.05.24 23:37:39 LOG7[184:1840]: 0 session cache hits 2005.05.24 23:37:39 LOG7[184:1840]: 0 session cache misses 2005.05.24 23:37:39 LOG7[184:1840]: 0 session cache timeouts 2005.05.24 23:37:39 LOG6[184:1840]: Negotiated ciphers: RC4-SHA SSLv3 Kx=RSA Au=RSA Enc=RC4(128) Mac=SHA1 2005.05.24 23:37:40 LOG7[184:1840]: SSL alert (read): warning: close notify 2005.05.24 23:37:40 LOG7[184:1840]: SSL closed on SSL_read 2005.05.24 23:37:40 LOG7[184:1840]: SSL write shutdown (output buffer empty) 2005.05.24 23:37:40 LOG7[184:1840]: Socket write shutdown (output buffer empty) 2005.05.24 23:37:40 LOG7[184:1840]: SSL alert (write): warning: close notify 2005.05.24 23:37:40 LOG6[184:1840]: SSL_shutdown successfully sent close_notify 2005.05.24 23:37:40 LOG7[184:1840]: Socket closed on read 2005.05.24 23:37:40 LOG5[184:1840]: Connection closed: 726 bytes sent to SSL, 648 bytes sent to socket 2005.05.24 23:37:40 LOG7[184:1840]: psuedo-https finished (0 left) LOG 2 - NOT WORKING 2005.08.15 15:46:07 LOG7[2636:3432]: psuedo-https accepted FD=180 from 127.0.0.1:3141 2005.08.15 15:46:07 LOG7[2636:3432]: FD 180 in non-blocking mode 2005.08.15 15:46:07 LOG7[2636:3432]: Creating a new thread 2005.08.15 15:46:07 LOG7[2636:3432]: New thread created 2005.08.15 15:46:07 LOG7[2636:1316]: psuedo-https started 2005.08.15 15:46:07 LOG5[2636:1316]: psuedo-https connected from 127.0.0.1:3141 2005.08.15 15:46:07 LOG7[2636:1316]: FD 172 in non-blocking mode 2005.08.15 15:46:07 LOG7[2636:1316]: psuedo-https connecting 65.171.127.243:443 2005.08.15 15:46:07 LOG7[2636:1316]: remote connect #1: EWOULDBLOCK: retrying 2005.08.15 15:46:07 LOG7[2636:1316]: waitforsocket: FD=172, DIR=write 2005.08.15 15:46:07 LOG7[2636:1316]: waitforsocket: ok 2005.08.15 15:46:07 LOG7[2636:1316]: remote connect #2: EINVAL: ok 2005.08.15 15:46:07 LOG7[2636:1316]: Remote FD=172 initialized 2005.08.15 15:46:07 LOG7[2636:1316]: SSL state (connect): before/connect initialization 2005.08.15 15:46:07 LOG7[2636:1316]: SSL state (connect): SSLv3 write client hello A 2005.08.15 15:46:07 LOG7[2636:1316]: waitforsocket: FD=172, DIR=read 2005.08.15 15:46:12 LOG7[2636:1316]: waitforsocket: ok 2005.08.15 15:46:12 LOG7[2636:1316]: SSL state (connect): SSLv3 read server hello A 2005.08.15 15:46:12 LOG7[2636:1316]: SSL state (connect): SSLv3 read finished A 2005.08.15 15:46:12 LOG7[2636:1316]: SSL state (connect): SSLv3 write change cipher spec A 2005.08.15 15:46:12 LOG7[2636:1316]: SSL state (connect): SSLv3 write finished A 2005.08.15 15:46:12 LOG7[2636:1316]: SSL state (connect): SSLv3 flush data 2005.08.15 15:46:12 LOG7[2636:1316]: 17 items in the session cache 2005.08.15 15:46:12 LOG7[2636:1316]: 230 client connects (SSL_connect()) 2005.08.15 15:46:12 LOG7[2636:1316]: 230 client connects that finished 2005.08.15 15:46:12 LOG7[2636:1316]: 0 client renegotiatations requested 2005.08.15 15:46:12 LOG7[2636:1316]: 0 server connects (SSL_accept()) 2005.08.15 15:46:12 LOG7[2636:1316]: 0 server connects that finished 2005.08.15 15:46:12 LOG7[2636:1316]: 0 server renegotiatiations requested 2005.08.15 15:46:12 LOG7[2636:1316]: 213 session cache hits 2005.08.15 15:46:12 LOG7[2636:1316]: 0 session cache misses 2005.08.15 15:46:12 LOG7[2636:1316]: 0 session cache timeouts 2005.08.15 15:46:12 LOG6[2636:1316]: Negotiated ciphers: AES256-SHA SSLv3 Kx=RSA Au=RSA Enc=AES(256) Mac=SHA1 2005.08.15 15:46:14 LOG7[2636:1316]: SSL_read returned WANT_: retrying 2005.08.15 15:46:14 LOG7[2636:1316]: SSL_read returned WANT_: retrying 2005.08.15 15:46:14 LOG7[2636:1316]: SSL alert (read): warning: close notify 2005.08.15 15:46:14 LOG7[2636:1316]: SSL closed on SSL_read 2005.08.15 15:46:14 LOG7[2636:1316]: SSL write shutdown (output buffer empty) 2005.08.15 15:46:14 LOG7[2636:1316]: Socket write shutdown (output buffer empty) 2005.08.15 15:46:14 LOG7[2636:1316]: SSL alert (write): warning: close notify 2005.08.15 15:46:14 LOG6[2636:1316]: SSL_shutdown successfully sent close_notify 2005.08.15 15:46:14 LOG5[2636:1316]: Connection closed: 738 bytes sent to SSL, 5754 bytes sent to socket 2005.08.15 15:46:14 LOG7[2636:1316]: psuedo-https finished (0 left) LOG 3 - NOT WORKING WITH LATEST VERSION OF STUNNEL/OPENSSL 2005.08.18 20:45:13 LOG7[2212:3324]: psuedo-https accepted FD=164 from 127.0.0.1:1076 2005.08.18 20:45:13 LOG7[2212:3324]: Creating a new thread 2005.08.18 20:45:13 LOG7[2212:3324]: New thread created 2005.08.18 20:45:13 LOG7[2212:3388]: psuedo-https started 2005.08.18 20:45:13 LOG7[2212:3388]: FD 164 in non-blocking mode 2005.08.18 20:45:13 LOG5[2212:3388]: psuedo-https connected from 127.0.0.1:1076 2005.08.18 20:45:13 LOG7[2212:3388]: FD 188 in non-blocking mode 2005.08.18 20:45:13 LOG7[2212:3388]: psuedo-https connecting 153.2.228.50:443 2005.08.18 20:45:13 LOG7[2212:3388]: connect_wait: waiting 10 seconds 2005.08.18 20:45:13 LOG7[2212:3388]: connect_wait: connected 2005.08.18 20:45:13 LOG7[2212:3388]: Remote FD=188 initialized 2005.08.18 20:45:16 LOG5[2212:3388]: VERIFY IGNORE: depth=1, /C=US/O=RSA Data Security, Inc./OU=Secure Server Certification Authority 2005.08.18 20:45:16 LOG5[2212:3388]: VERIFY IGNORE: depth=1, /C=US/O=RSA Data Security, Inc./OU=Secure Server Certification Authority 2005.08.18 20:45:16 LOG5[2212:3388]: VERIFY IGNORE: depth=0, /C=US/ST=New Jersey/L=Mahwah/O=United Parcel Service/OU=Internet System/OU=Terms of use at www.verisign.com/rpa (c)05/CN=www.ups.com 2005.08.18 20:45:17 LOG6[2212:3388]: SSL connected: new session negotiated 2005.08.18 20:45:17 LOG6[2212:3388]: Negotiated ciphers: RC4-SHA SSLv3 Kx=RSA Au=RSA Enc=RC4(128) Mac=SHA1 2005.08.18 20:45:20 LOG7[2212:3388]: SSL_read returned WANT_READ: retrying 2005.08.18 20:45:20 LOG7[2212:3388]: SSL_read returned WANT_READ: retrying 2005.08.18 20:45:20 LOG7[2212:3388]: SSL closed on SSL_read 2005.08.18 20:45:20 LOG7[2212:3388]: Socket write shutdown 2005.08.18 20:45:20 LOG7[2212:3388]: SSL write shutdown 2005.08.18 20:45:20 LOG6[2212:3388]: SSL_shutdown successfully sent close_notify 2005.08.18 20:45:20 LOG5[2212:3388]: Connection closed: 738 bytes sent to SSL, 8248 bytes sent to socket 2005.08.18 20:45:20 LOG7[2212:3388]: psuedo-https finished (0 left) Output of stunnel.exe -version ************************************* stunnel 4.11 on x86-pc-mingw32-gnu WIN32+IPv6 with OpenSSL 0.9.7f 22 Mar 2005 Global options cert = stunnel.pem ciphers = ALL:!ADH:+RC4:@STRENGTH debug = 5 key = stunnel.pem RNDbytes = 64 RNDoverwrite = yes service = stunnel session = 300 seconds taskbar = yes verify = none Service-level options TIMEOUTbusy = 300 seconds TIMEOUTclose = 60 seconds TIMEOUTconnect = 10 seconds TIMEOUTidle = 43200 seconds 2005.08.18 21:06:04 LOG3[2508:3100]: Server is down

2 1

Win32 Local Privilege Escalation when Stunnel installed as a System service
by Ian 18 Aug '05

18 Aug '05

Hi, There is a trivial to exploit Local Privilege Escalation when stunnel is installed as a system service on windows. Who should I inform of this so a fix can be made? Thanks Ian --

5 4

stunnel Bug Tracking System
by Michal Trojnara 10 Aug '05

10 Aug '05

Dear Users, I've installed a Bug Tracking System for stunnel. You can enter bugs and feature requests here: http://stunnel.mirt.net/flyspray/ Best regards, Mike

1 0

stunnel for postgresql in windows
by babu 10 Aug '05

10 Aug '05

Hi all, I have seen stunnel example for mysql. how to use stunnel for postgresql in windows.. Thanks babu --------------------------------- To help you stay safe and secure online, we've developed the all new Yahoo! Security Centre.

2 2

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