May 2006 - stunnel-users

Performance Problems.
by Don Werve 05 May '06

05 May '06

After a fair bit of poking, prodding, and googling, I have yet to find the solution to my problem. So, here goes: stunnel looks to be running slowly. Very slowly. We're starting to analyze it with gprof to see where it spends all of its time when we're trying to do content negotiation, and I've whipped up a quick-and-dirty Ruby script that grabs data from the server and then spits out the performace results; I'm sitting on my own T1, so our connectivity is pretty good. The results with this script are similar with 'delay=yes', 'session=600', and 'compression=zlib'. So, here's what happens when I nab data from our stunnel-ed server with said script (I can supply the script if anyone is interested): #File Size time thrpht time thrprt multiple ---------------------------------------------------------------------- index.html 7k http 0.1548 ( 46k/s) https 0.7449 ( 9k/s) * 4.8131 test1.jpg 1k http 0.0928 ( 12k/s) https 0.6379 ( 1k/s) * 6.8726 test2.jpg 10k http 0.1812 ( 59k/s) https 0.6743 ( 16k/s) * 3.7208 test3.jpg 19k http 0.2236 ( 85k/s) https 0.7677 ( 24k/s) * 3.4338 test4.jpg 53k http 0.5668 ( 94k/s) https 1.1543 ( 46k/s) * 2.0365 test5.jpg 97k http 0.7861 (123k/s) https 2.1974 ( 44k/s) * 2.7954 test6.jpg 214k http 1.4061 (152k/s) https 2.3735 ( 90k/s) * 1.6880 test7.jpg 140k http 0.9434 (149k/s) https 1.9331 ( 72k/s) * 2.0491 test8.jpg 470k http 2.8590 (164k/s) https 3.7696 (124k/s) * 1.3185 ('multiple' is the number of times 'slower' https is versus http). And, here's my stunnel config: *** cert = /etc/certs/combined.pem setuid = nobody setgid = nobody pid = /var/run/stunnel/stunnel.pid socket = l:TCP_NODELAY=1 socket = r:TCP_NODELAY=1 debug = 0 output = /var/log/stunnel [https] local = 64.40.110.16 accept = 443 connect = 64.40.110.16:80 TIMEOUTclose = 0 *** So, any ideas why stunnel is working so slowly? I mean, I know there's the overhead of the SSL negotiation, and I've heard some things about a stunnel session cache, but nothing about enabling/using it (unless 'session = something bigger than zero' does so?). Any suggestions to improve performance, especially for large batches of small transfers? Thanks-in-advance! -- Don Werve <donw(a)iradeon.net> Chief Systems Administrator / Systems Architect

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Using stunnel to add https support to ONE virtual host
by Gonzalo Diethelm 05 May '06

05 May '06

Hello, I have Apache serving plain http pages for several domains running as virtual hosts on one machine (debian). I know SSL will not work with this setup, and I understand the reasons why (at least I think I do). Let's say the virtual hosts are www.server1.com www.server2.com www.server3.com I would like to use stunnel to add https capabilities to ONE of the virtual hosts (say, www.server3.com) In other words, I would like to configure stunnel in server mode with a certificate file, listening on www.server3.com:443, so that if I use a browser to visit https://www.server3.com/ then stunnel will accept the connection and forward all traffic to www.server3.com:80, letting Apache handle it; in particular, this would have to allow Apache to recognize which of the virtual hosts is being visited; I wouldn't like to have www.server1.com respond to my requests instead of www.server3.com. Is this possible? Any caveats, hints, recommendations? Thanks in advance, and best regards, -- Gonzalo Diethelm gonzalo.diethelm(a)aditiva.com

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Using stunnel to add https support to ONE virtual host
by Gonzalo Diethelm 04 May '06

04 May '06

Hello, I have Apache serving plain http pages for several domains running as virtual hosts on one machine (debian). I know SSL will not work with this setup, and I understand the reasons why (at least I think I do). Let's say the virtual hosts are www.server1.com www.server2.com www.server3.com I would like to use stunnel to add https capabilities to ONE of the virtual hosts (say, www.server3.com) In other words, I would like to configure stunnel in server mode with a certificate file, listening on www.server3.com:443, so that if I use a browser to visit https://www.server3.com/ then stunnel will accept the connection and forward all traffic to www.server3.com:80, letting Apache handle it; in particular, this would have to allow Apache to recognize which of the virtual hosts is being visited; I wouldn't like to have www.server1.com respond to my requests instead of www.server3.com. Is this possible? Any caveats, hints, recommendations? Thanks in advance, and best regards, -- Gonzalo Diethelm gonzalo.diethelm(a)aditiva.com

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Re: stunnel 4.15 crashes with vnc server 4.1.1
by Harry Boeck 04 May '06

04 May '06

Hallo stunnel-users, @Michal Trojnara: Thanks for your help, Mike! The solution came overnight when i remembered my own message: > and the screen on the server side should remove the background image > and visual effects). Well: I disabled the desktop modifications in vnc and it runs. Something is incompatible in the stunnel GUI with the removal of global windows GUI behaviour (despite the fact, that i have not a single one of them in use - to the best of my knowledge), what has nothing to do with the dedication of stunnel. Maybe there's a simple GUI message not handled correctly? As this seems to be something common to all windows versions, could this possibly happen in windows xp, too? (I don't use one, so somone would have to investigate this.) It's another motivation to start compiling in cygnus. But unfortunally at this very moment i'm occupied with other tasks. May be some other guy has the fancy to look at this matter... Mit freundlichem Gruß Harry Boeck

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stunnel install issues with mknod command
by Trishul Shah 04 May '06

04 May '06

Hi, I was wondering if you could help me, I am trying to install stunnel on a machine running solaris 10, but the catch is that I am trying to install it within a zone in solaris 10, unfortunately during the installation process after the source is compiled I see the following error: Making install in src test -z "/usr/local/lib" || /bin/bash ../auto/mkinstalldirs "/usr/local/lib" /bin/bash ../libtool --mode=install ../auto/install-sh -c 'libstunnel.la' '/usr/local/lib/libstunnel.la' ../auto/install-sh -c .libs/libstunnel.so /usr/local/lib/libstunnel.so chmod +x /usr/local/lib/libstunnel.so ../auto/install-sh -c .libs/libstunnel.lai /usr/local/lib/libstunnel.la ---------------------------------------------------------------------- Libraries have been installed in: /usr/local/lib If you ever happen to want to link against installed libraries in a given directory, LIBDIR, you must either use libtool, and specify the full pathname of the library, or use the `-LLIBDIR' flag during linking and do at least one of the following: - add LIBDIR to the `LD_LIBRARY_PATH' environment variable during execution - use the `-RLIBDIR' linker flag See any operating system documentation about shared libraries for more information, such as the ld(1) and ld.so(8) manual pages. ---------------------------------------------------------------------- test -z "/usr/local/sbin" || /bin/bash ../auto/mkinstalldirs "/usr/local/sbin" /bin/bash ../libtool --mode=install ../auto/install-sh -c 'stunnel' '/usr/local/sbin/stunnel' ../auto/install-sh -c stunnel /usr/local/sbin/stunnel test -z "/usr/local/sbin" || /bin/bash ../auto/mkinstalldirs "/usr/local/sbin" ../auto/install-sh -c 'stunnel3' '/usr/local/sbin/stunnel3' Making install in doc test -z "/usr/local/share/doc/stunnel" || /bin/bash ../auto/mkinstalldirs "/usr/local/share/doc/stunnel" ../auto/install-sh -c -m 644 'stunnel.html' '/usr/local/share/doc/stunnel/stunnel.html' ../auto/install-sh -c -m 644 'stunnel.pl.html' '/usr/local/share/doc/stunnel/stunnel.pl.html' ../auto/install-sh -c -m 644 'stunnel.fr.html' '/usr/local/share/doc/stunnel/stunnel.fr.html' test -z "/usr/local/man/man8" || /bin/bash ../auto/mkinstalldirs "/usr/local/man/man8" ../auto/install-sh -c -m 644 './stunnel.8' '/usr/local/man/man8/stunnel.8' ../auto/install-sh -c -m 644 './stunnel.pl.8' '/usr/local/man/man8/stunnel.pl.8' ../auto/install-sh -c -m 644 './stunnel.fr.8' '/usr/local/man/man8/stunnel.fr.8' Making install in tools test -z "/usr/local/etc/stunnel" || /bin/bash ../auto/mkinstalldirs "/usr/local/etc/stunnel" ../auto/install-sh -c -m 644 'stunnel.conf-sample' '/usr/local/etc/stunnel/stunnel.conf-sample' if test ! -r /usr/local/etc/stunnel/stunnel.pem; then \ if test -r "/dev/urandom"; then \ dd if="/dev/urandom" of=stunnel.rnd bs=256 count=1; \ RND="-rand stunnel.rnd"; \ else \ RND=""; \ fi; \ /usr/local/bin/openssl req -new -x509 -days 365 -nodes $RND \ -config ./stunnel.cnf \ -out stunnel.pem -keyout stunnel.pem; \ test -eq 0 || /usr/local/bin/openssl gendh $RND 512 >> stunnel.pem; \ /usr/local/bin/openssl x509 -subject -dates -fingerprint -noout -in stunnel.pem; \ ../auto/install-sh -c -m 600 stunnel.pem /usr/local/etc/stunnel/stunnel.pem; \ rm stunnel.pem; \ fi mkdir -p /usr/local/var/stunnel chmod a=rwx,+t /usr/local/var/stunnel if uname | grep SunOS; then \ mkdir -p /usr/local/var/stunnel/dev; \ chmod u=rwx,go=rx /usr/local/var/stunnel/dev; \ mknod /usr/local/var/stunnel/dev/zero c 13 12; \ chmod a=rw /usr/local/var/stunnel/dev/zero; \ fi SunOS mknod: Not owner *** Error code 2 make: Fatal error: Command failed for target `install-data-local' Current working directory /export/home/playtech/stunnel-4.14/tools *** Error code 1 The following command caused the error: make install-exec-am install-data-am make: Fatal error: Command failed for target `install-am' Current working directory /export/home/playtech/stunnel-4.14/tools *** Error code 1 The following command caused the error: failcom='exit 1'; \ for f in x $MAKEFLAGS; do \ case $f in \ *=* | --[!k]*);; \ *k*) failcom='fail=yes';; \ esac; \ done; \ dot_seen=no; \ target=`echo install-recursive | sed s/-recursive//`; \ list='src doc tools'; for subdir in $list; do \ echo "Making $target in $subdir"; \ if test "$subdir" = "."; then \ dot_seen=yes; \ local_target="$target-am"; \ else \ local_target="$target"; \ fi; \ (cd $subdir && make $local_target) \ || eval $failcom; \ done; \ if test "$dot_seen" = "no"; then \ make "$target-am" || exit 1; \ fi; test -z "$fail" make: Fatal error: Command failed for target `install-recursive' After much digging around I have discovered that the mknod command cannot be used within a solaris 10 zone, I have gotten round this previously by installing stunnel from the global zone but that intertwines the parent zone with the child zone and ideally we would like to keep these as independent of each other as possible as we use these zones for 3rs party applications and hence we have a lot of other user traffic on these zones. Thanks in advance for your help. Kind Regards, Trishul Shah Blue Square Tel: 020 7288 7920 Mob: 07789 982 688 Fax: 020 7288 7955

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stunnel 4.15 crashes with vnc server 4.1.1
by Harry Boeck 04 May '06

04 May '06

Hallo stunnel users, i'm learning to use ssl and ssh tools to get secured access to my home server from work and other places. I already have a working ssh installation but stumbled over stunnel ba accident. I would like to use it, because i still have computers in use with win98 (both for myself and among my clients) and this little program is exactly all what i would need to use vnc over a secured connection. SSH to the contrary needs a little bit more setup (over a cygwin that serves the only purpose of aquiring such tools like SSH), needs its own crypto library compilation and so on. Now, there is the problem that stunnel 4.15 crashes at the moment, when the vnc server 4.1.1 tries to deliver its first screen to the client. Stunnel was downloaded from http://www.stunnel.org/download/binaries.html, vnc was downloaded from http://www.realvnc.com (already some times ago). Both where downloaded as binaries, for the typical help hints on forums for the question "i have a compile problem on windows" being "how dare you"... Both machines i'm using for testing use win98 as operating system. The crash happens both when testing a configuration on one machine with stunnel running both as server and as client, as well as when using it to connect two machines with stunnel running as server on the machine with vnc server and as client on the machine with vnc client. VNC runs correct for itself as well as via an ssh secured connection. Stunnel is startet with only the server versus the client configuration file as command line parameter. The configuration files are: http://harryboeck.dyndns.org/Sicherheit/stunnel-server.ini http://harryboeck.dyndns.org/Sicherheit/stunnel-client.ini Stunnel delivers correctly the data between vnc server and client (including connection establishment and authentication) until the point of first screen transfer (when the screen on the client side turns black and the screen on the server side should remove the background image and visual effects). The output of stunnel server and client is: http://harryboeck.dyndns.org/Sicherheit/stunnel-server.log http://harryboeck.dyndns.org/Sicherheit/stunnel-client.log The output of "stunnel -version" is: http://harryboeck.dyndns.org/Sicherheit/stunnel-version.txt I have no clue what '6. Output of "uname -a"' should mean, if that is somehow important for hints, please let me know. openssl version is: OpenSSL 0.9.8a 11 Oct 2005 I would appreciate any suggestions or hints on the interaction of vnc and stunnel. with best regards Harry Boeck

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certificate unknown
by Ludovic DUFLOT 03 May '06

03 May '06

Hi, I tried to use stunnel to connect in SSL to a LDAP server. But I can't and I've got this error message: certificate unknown I use stunnel for establishing connexion with IMAPS server and all is right but not for LDAP connexion. The certificate is self-signate. I searched on the list's archives and with google but I can't find any solution... Help !!! Ludo ps: these are the stunnel.conf and the log: *************************** cert = stunnel.pem ; Some performance tunings socket = l:TCP_NODELAY=1 socket = r:TCP_NODELAY=1 ; Workaround for Eudora bug ;options = DONT_INSERT_EMPTY_FRAGMENTS ; Some debugging stuff useful for troubleshooting debug = 7 ;output = stunnel.log ; Use it for client mode client = yes ; Service-level configuration [ldaps] accept = 389 connect = 10.0.0.1:636 verify = 0 [imaps] accept = 143 connect = 10.0.0.2:993 *************************** 2006.05.03 07:52:40 LOG7[4436:2436]: RAND_status claims sufficient entropy for the PRNG 2006.05.03 07:52:40 LOG6[4436:2436]: PRNG seeded successfully 2006.05.03 07:52:40 LOG7[4436:2436]: Certificate: stunnel.pem 2006.05.03 07:52:40 LOG7[4436:2436]: Key file: stunnel.pem 2006.05.03 07:52:40 LOG7[4436:2436]: SSL context initialized for service ldaps 2006.05.03 07:52:40 LOG7[4436:2436]: Certificate: stunnel.pem 2006.05.03 07:52:40 LOG7[4436:2436]: Key file: stunnel.pem 2006.05.03 07:52:40 LOG7[4436:2436]: SSL context initialized for service imaps 2006.05.03 07:52:40 LOG7[4436:2436]: Certificate: stunnel.pem 2006.05.03 07:52:40 LOG7[4436:2436]: Key file: stunnel.pem 2006.05.03 07:52:40 LOG7[4436:2436]: SSL context initialized for service https 2006.05.03 07:52:40 LOG5[4436:2436]: stunnel 4.15 on x86-pc-mingw32-gnu with OpenSSL 0.9.7f 22 Mar 2005 2006.05.03 07:52:40 LOG5[4436:2436]: Threading:WIN32 SSL:ENGINE Sockets:SELECT,IPv6 2006.05.03 07:52:40 LOG5[4436:4612]: No limit detected for the number of clients 2006.05.03 07:52:40 LOG7[4436:4612]: FD 192 in non-blocking mode 2006.05.03 07:52:40 LOG7[4436:4612]: SO_REUSEADDR option set on accept socket 2006.05.03 07:52:40 LOG7[4436:4612]: ldaps bound to 0.0.0.0:389 2006.05.03 07:52:40 LOG7[4436:4612]: FD 196 in non-blocking mode 2006.05.03 07:52:40 LOG7[4436:4612]: SO_REUSEADDR option set on accept socket 2006.05.03 07:52:40 LOG7[4436:4612]: imaps bound to 0.0.0.0:143 2006.05.03 07:52:40 LOG7[4436:4612]: FD 212 in non-blocking mode 2006.05.03 07:52:40 LOG7[4436:4612]: SO_REUSEADDR option set on accept socket 2006.05.03 07:52:40 LOG7[4436:4612]: https bound to 0.0.0.0:443 2006.05.03 07:52:50 LOG7[4436:4612]: ldaps accepted FD=220 from 127.0.0.1:2893 2006.05.03 07:52:50 LOG7[4436:4612]: Creating a new thread 2006.05.03 07:52:50 LOG7[4436:4612]: New thread created 2006.05.03 07:52:50 LOG7[4436:5780]: ldaps started 2006.05.03 07:52:50 LOG7[4436:5780]: FD 220 in non-blocking mode 2006.05.03 07:52:50 LOG7[4436:5780]: TCP_NODELAY option set on local socket 2006.05.03 07:52:50 LOG5[4436:5780]: ldaps connected from 127.0.0.1:2893 2006.05.03 07:52:50 LOG7[4436:5780]: FD 244 in non-blocking mode 2006.05.03 07:52:50 LOG7[4436:5780]: ldaps connecting 10.0.0.1:636 2006.05.03 07:52:50 LOG7[4436:5780]: connect_wait: waiting 10 seconds 2006.05.03 07:52:50 LOG7[4436:5780]: connect_wait: connected 2006.05.03 07:52:50 LOG7[4436:5780]: Remote FD=244 initialized 2006.05.03 07:52:50 LOG7[4436:5780]: TCP_NODELAY option set on remote socket 2006.05.03 07:52:50 LOG7[4436:5780]: SSL state (connect): before/connect initialization 2006.05.03 07:52:50 LOG7[4436:5780]: SSL state (connect): SSLv3 write client hello A 2006.05.03 07:52:50 LOG7[4436:5780]: SSL state (connect): SSLv3 read server hello A 2006.05.03 07:52:50 LOG5[4436:5780]: VERIFY IGNORE: depth=1, /C=FR/ST=Savoie/L=Chambery/O=Universite de Savoie/OU=DSI/CN=DSI CA/emailAddress=admin(a)univ-savoie.fr 2006.05.03 07:52:50 LOG5[4436:5780]: VERIFY IGNORE: depth=1, /C=FR/ST=Savoie/L=Chambery/O=Universite de Savoie/OU=DSI/CN=DSI CA/emailAddress=admin(a)univ-savoie.fr 2006.05.03 07:52:50 LOG5[4436:5780]: VERIFY IGNORE: depth=1, /C=FR/ST=Savoie/L=Chambery/O=Universite de Savoie/OU=DSI/CN=DSI CA/emailAddress=admin(a)univ-savoie.fr 2006.05.03 07:52:50 LOG5[4436:5780]: VERIFY IGNORE: depth=0, /C=FR/ST=Savoie/L=Chambery/O=Universite de Savoie/OU=DSI/CN=ldap-bourget.univ-savoie.fr 2006.05.03 07:52:50 LOG7[4436:5780]: SSL state (connect): SSLv3 read server certificate A 2006.05.03 07:52:50 LOG7[4436:5780]: SSL state (connect): SSLv3 read server certificate request A 2006.05.03 07:52:50 LOG7[4436:5780]: SSL state (connect): SSLv3 read server done A 2006.05.03 07:52:50 LOG7[4436:5780]: SSL state (connect): SSLv3 write client certificate A 2006.05.03 07:52:50 LOG7[4436:5780]: SSL state (connect): SSLv3 write client key exchange A 2006.05.03 07:52:50 LOG7[4436:5780]: SSL state (connect): SSLv3 write certificate verify A 2006.05.03 07:52:50 LOG7[4436:5780]: SSL state (connect): SSLv3 write change cipher spec A 2006.05.03 07:52:50 LOG7[4436:5780]: SSL state (connect): SSLv3 write finished A 2006.05.03 07:52:50 LOG7[4436:5780]: SSL state (connect): SSLv3 flush data 2006.05.03 07:52:50 LOG7[4436:5780]: SSL alert (read): fatal: certificate unknown 2006.05.03 07:52:50 LOG3[4436:5780]: SSL_connect: 14094416: error:14094416:SSL routines:SSL3_READ_BYTES:sslv3 alert certificate unknown 2006.05.03 07:52:50 LOG5[4436:5780]: Connection reset: 0 bytes sent to SSL, 0 bytes sent to socket 2006.05.03 07:52:50 LOG7[4436:5780]: ldaps finished (0 left)

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Wrapping interclient connections outbound to many servers
by Matthew Case 02 May '06

02 May '06

Hello all, I have searched high and low for a solution to this problem, but I haven't found anything so I am coming here in hopes someone will be able to help me. I have to wrap the interclient protocol (>1024 to 3060) in some manner of encryption to appease one of my clients. I have already wrapped the ajp13 protocol between the apache server and the tomcat server, but now the tomcat server (which acts as an stunnel server in the ajp13 setup) must also act as a client and wrap all outbound and return traffic to 10 servers to and from port 3060. Making large modifications to the source code is not going to be feasible given my current time crunch (it must be implemented in two weeks). Has anyone run into anything like this and does anyone have any tips? Thanks in advance! - Matt

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Stunnel + Snort + MySQL
by Steven 02 May '06

02 May '06

I have a problem that I have been unsuccessful in solve thus far with Stunnel, Snort, and MySQL. Stunnel (client & server): 4.04 Snort: 2.4.4 on the client MySQL Ver 11.18 Distrib 3.23.58, for redhat-linux-gnu (i386) [not the latest and greatest by any means] I setup stunnel so that traffic destined for localhost 3306 (mysql) on the client goes to port 3307 on the server. Stunnel on the server is setup to take traffic from 3307 and send it to 3306 locally. This connection works fine. I can fire up Snort and have events properly log to my snort database on the server from the client. However, if stunnel is stopped/restarted on either the client or the server Snort is not able to keep writing to the database unless it is restarted. I just get this error: May 2 12:44:03 box snort[44126]: database: Problem inserting a new signature 'Test Snort Signature' May 2 12:44:03 box1 snort[44126]: database: mysql_error: MySQL server has gone away SQL=INSERT INTO event (sid,cid,signature,timestamp) VALUES ('4', '22', '0', '2006-05-02 16:44:03.322') May 2 12:44:03 box snort[44126]: database: mysql_error: MySQL server has gone away SQL=ROLLBACK Whenever I close stunnel it sends traffic to the other end. I can restart it and open up new connections just fine. However, Snort will not even try and connect to port 3306. Once stunnel has been stopped (or even restarted) it just immediately fails to even try and connect to the port. It seems there's some kind of signal sent that kills the connection (and all future connections?). I cannot figure oout why this happens. Any ideas? Thanks Steven

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