October 2006 - stunnel-users

[stunnel-users]Plan for new authorisation method in Stunnel
by Thomas Thiele 11 Oct '06

11 Oct '06

Hello Stunnel Users, I am planning to develop a new authorisation method for Stunnel which I need for work. This method will be an addition to the existing methods for checking certificates. The idea is to use the subject names and the alternative names of the certificates to allow or drop connections. The subject and alternative names of the machines/clients that are allowed to connect to the server will be written into the Stunnel config. While checking the certificates, the subject and alternative names from the Stunnel config will be compared with the subject and alternative names in the certirficate from the connection request. If one of the names from the Stunnel config matches with the names from the certificate then the connection will be allowed. This is the basic idea of my project. Is anyone already working on something like that or do you have any ideas or suggestions for me? Best Regards, Thomas Thiele -- GMX DSL-Flatrate 0,- Euro* - Überall, wo DSL verfügbar ist! NEU: Jetzt bis zu 16.000 kBit/s! http://www.gmx.net/de/go/dsl

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libstunnel.so
by Andrew Schulman 05 Oct '06

05 Oct '06

The Debian stunnel (actually stunnel4) package includes /usr/lib/libstunnel.so. I have two questions about this file: (1) What is its purpose? ldd shows that /usr/bin/stunnel doesn't depend on it. So is this the shared library referred to in stunnel(1), under the 'transparent' option? The man page says that to use 'transparent' one has to LD_PRELOAD env.so, but I don't find any env.so. I see that env.c is used in building libstunnel.a, so I'm guessing that the man page meant to say libstunnel.so instead of env.so. (2) How does one build it? configure includes a --with-shared-libs option, but even when that's enabled I don't get a libstunnel.so when I build. And I can't find any make targets for any .so files. Yet Debian includes this file. Thanks, Andrew.

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Configure can't find openssl in Ubuntu
by Tommi Nieminen 04 Oct '06

04 Oct '06

Hello, I have an Ubuntu 6.06.1 (Dapper) where I'm trying to install Stunnel. First I tried to install Stunnel using Ubuntu's package manager (apt-get install stunnel4). The installation went very smoothly but the fact that stunnel didn't recognize the -V switch left me with an uneasy feeling that something else might be lacking, too. The Ubuntu package in question contains Stunnel 4.14. Stunnel 3.26, installed from another package, does recognize the -V switch. So then I tried several times installing stunnel from source. A few obstacles I managed to overcome, but now that the configure script stops telling that it can't find SSL directory checking for SSL directory... Not found Couldn't find your SSL library installation dir Use --with-ssl option to fix this problem I'm out of resources. The script seems to check the existence of ssl.h file: checkssldir() { : if test -f "$1/include/openssl/ssl.h" Despite the fact that I have OpenSSL 0.9.8a on my machine, I don't have ssl.h file anywhere, I checked that with find. I tried installing Linux headers, but that didn't help (well I didn't expect it to help, but I couldn't think of anything). Is there some package I should get, that doesn't come with the openssl package or how should I solve this problem? Any ideas? Another problem that I had when I was experimenting with Stunnel 3.26 was the fact, that I couldn't start it up. It kept asking for the -r or -l switch. What I want to do with Stunnel is to decrypt the traffic coming in on one interface and then forward it to another machine through another interface. I tried several different configuration files, this is one of them (without indentations): cert = stunnel.pem key = stunnel.pem socket = l:TCP_NODELAY=1 socket = r:TCP_NODELAY=1 verify = 1 debug = 7 output = stunnel.log client = no [https] accept = 443 connect = 192.168.10.17:5010 TIMEOUTclose = 0 I didn't get any debug information and -f switch didn't give anything more. I tried the Windows version (4.18) on another pc and it seemed to do exactly what I wanted. (the config file may have been slightly different, at least no debug was set. I really would like to get this working on a Linux box, too. Tommi Nieminen

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Convert to SSL
by Bob 04 Oct '06

04 Oct '06

Hello all, I have been looking online at the examples but can't seem to quite figure out how to do this. We are currently using stunnel to receive SSL message and redirect them as regular messages but now I need to go the other way first. Is it possible to setup stunnel to receive an non-SSL messages and redirect it as an SSL message? and can this be done in the current config file or do I have to run 2 stunnel daemons? Also, the new one has to validate certificates. -- _______________________________________________________________________ Thanks, Bob (bobif(a)adelphia.net) YahooIM: bobifx AOLIM: bobifmd ICQ: 111083556

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"SSL3_GET_RECORD:wrong version number" error
by James Brown 04 Oct '06

04 Oct '06

I am having problems connecting to stunnel and was hoping someone could help me. When starting stunnel and then trying to send an SSL-encrypted email through it I get: $ sudo /usr/local/sbin/stunnel /sw/etc/stunnel/stunnel.conf -D 465 -r 25 2006.10.04 11:03:28 LOG7[29230:2684415368]: Snagged 64 random bytes from /Users/jlbrown/.rnd 2006.10.04 11:03:28 LOG7[29230:2684415368]: Wrote 1024 new random bytes to /Users/jlbrown/.rnd 2006.10.04 11:03:28 LOG7[29230:2684415368]: RAND_status claims sufficient entropy for the PRNG 2006.10.04 11:03:28 LOG7[29230:2684415368]: PRNG seeded successfully 2006.10.04 11:03:28 LOG7[29230:2684415368]: Certificate: /Users/ jlbrown/%1.pem 2006.10.04 11:03:28 LOG7[29230:2684415368]: Certificate loaded 2006.10.04 11:03:28 LOG7[29230:2684415368]: Key file: /Users/jlbrown/% 1.pem 2006.10.04 11:03:28 LOG7[29230:2684415368]: Private key loaded 2006.10.04 11:03:28 LOG7[29230:2684415368]: SSL context initialized for service ssmtp 2006.10.04 11:03:28 LOG5[29230:2684415368]: stunnel 4.18 on powerpc- apple-darwin8.8.0 with OpenSSL 0.9.7i 14 Oct 2005 2006.10.04 11:03:28 LOG5[29230:2684415368]: Threading:PTHREAD SSL:ENGINE Sockets:SELECT,IPv4 Auth:LIBWRAP 2006.10.04 11:03:28 LOG6[29230:2684415368]: file ulimit = 256 (can be changed with 'ulimit -n') 2006.10.04 11:03:28 LOG6[29230:2684415368]: FD_SETSIZE = 1024 (some systems allow to increase this value) 2006.10.04 11:03:28 LOG5[29230:2684415368]: 125 clients allowed 2006.10.04 11:03:28 LOG7[29230:2684415368]: FD 6 in non-blocking mode 2006.10.04 11:03:28 LOG7[29230:2684415368]: FD 7 in non-blocking mode 2006.10.04 11:03:28 LOG7[29230:2684415368]: FD 8 in non-blocking mode 2006.10.04 11:03:28 LOG7[29230:2684415368]: SO_REUSEADDR option set on accept socket 2006.10.04 11:03:28 LOG7[29230:2684415368]: ssmtp bound to 0.0.0.0:465 James-Browns-Computer-2:~/stunnel-4.18 jlbrown$ 2006.10.04 11:03:28 LOG7[29231:2684415368]: Created pid file /usr/local/var/run/stunnel/ stunnel.pid 2006.10.04 11:08:08 LOG7[29231:2684415368]: ssmtp accepted FD=9 from 127.0.0.1:64235 2006.10.04 11:08:08 LOG7[29231:25188864]: ssmtp started 2006.10.04 11:08:08 LOG7[29231:25188864]: FD 9 in non-blocking mode 2006.10.04 11:08:08 LOG7[29231:25188864]: TCP_NODELAY option set on local socket 2006.10.04 11:08:08 LOG7[29231:25188864]: FD 10 in non-blocking mode 2006.10.04 11:08:08 LOG7[29231:25188864]: FD 11 in non-blocking mode 2006.10.04 11:08:08 LOG7[29231:25188864]: Connection from 127.0.0.1:64235 permitted by libwrap 2006.10.04 11:08:08 LOG5[29231:25188864]: ssmtp connected from 127.0.0.1:64235 2006.10.04 11:08:08 LOG7[29231:2684415368]: Cleaning up the signal pipe 2006.10.04 11:08:08 LOG7[29231:25188864]: FD 10 in non-blocking mode 2006.10.04 11:08:08 LOG7[29231:25188864]: ssmtp connecting 127.0.0.1:25 2006.10.04 11:08:08 LOG7[29231:25188864]: connect_wait: waiting 10 seconds 2006.10.04 11:08:08 LOG6[29231:2684415368]: Child process 29421 finished with code 0 2006.10.04 11:08:08 LOG7[29231:25188864]: connect_wait: connected 2006.10.04 11:08:08 LOG7[29231:25188864]: Remote FD=10 initialized 2006.10.04 11:08:08 LOG7[29231:25188864]: TCP_NODELAY option set on remote socket 2006.10.04 11:08:08 LOG7[29231:25188864]: SSL state (connect): before/ connect initialization 2006.10.04 11:08:08 LOG7[29231:25188864]: SSL state (connect): SSLv3 write client hello A 2006.10.04 11:08:08 LOG7[29231:25188864]: SSL alert (write): fatal: handshake failure 2006.10.04 11:08:08 LOG3[29231:25188864]: SSL_connect: 1408F10B: error:1408F10B:SSL routines:SSL3_GET_RECORD:wrong version number 2006.10.04 11:08:08 LOG5[29231:25188864]: Connection reset: 0 bytes sent to SSL, 0 bytes sent to socket 2006.10.04 11:08:08 LOG7[29231:25188864]: ssmtp finished (0 left) Any suggestions as to what is causing this and how I can fix it? I got the same thing on another machine, with stunnel 4.04 and OpenSSL 0.9.7d. My stunnel.conf file is: cert = /Users/jlbrown/%1.pem key = /Users/jlbrown/%1.pem debug=7 output=/dev/stdout ; Some performance tunings socket = l:TCP_NODELAY=1 socket = r:TCP_NODELAY=1 ; Service-level configuration [ssmtp] client = yes accept = 465 connect = 192.168.1.31:25 Thanks, James.

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Thanks
by Eric S. Eberhard 02 Oct '06

02 Oct '06

For the help ... I believe I got it. Was I got that debug bug fixed I could tell what was going on. In the end I just stopped fighting it and downloaded prngd and ran it for a while. Interestingly, once I did this, it continues to work fine w/out prngd up and running. It did something I don't understand to my random file (apparently the old one was not good enough) and now it works!##$ Don't understand it, but it works! I still have some other application problem but I appear to get responses now. Thanks, Eric This email sent by: Eric S. Eberhard (928) 567-3727 Voice (928) 567-6122 Fax 928-301-7537 -- you may call any time day or night, I turn it off when I sleep :-) Please try to use a land line first (reception often poor). Note the change in the domain from vicspdi.com to vicsmba.com !!!! For Metropolis support and VICS MBA Support!!!! http://www.vicsmba.com Completely updated web site of personal pictures with many new pictures! Includes horses, dogs, Corvairs, and more. http://www.vicsmba.com/ourpics/index.html Corvair pictures including the Judson setup on our 62 Sedan and lots of pictures of Cheryl's 62 Monza Wagon and our 62 Spyder convertible. http://www.vicsmba.com/ourpics/corvairs.html My younger brother Martin has started a very serious car company. A hot rod (very fast) electric roadster is the first offering. The chassis is built by Lotus to their specs. Check it out: http://www.teslamotors.com

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Re: [stunnel-users] Help please - debug and random file
by Eric S. Eberhard 02 Oct '06

02 Oct '06

Mike, Ah -- you are an expert! Amazing product in that I last download this in 2000 and have used it without incident ever since. Too bad I am forced to upgrade. I have hunted down the problem some more -- it has to do with the randomness. Using dbx I have found that it is blocking on a socked read for DEVRANDOM_EGD ... I did not specifically set up any sockets for randomness anyplace. Or set any options. I don't really want a socket, I was perfectly happy with my little 1024 byte .rnd file. If I copy a file (at random :-) ) and specify that it use that file for randomness, it reads it and sets it to zero bytes (unless I tell it not to overwrite). It then goes to read the socket and hangs. I suspect this is more an openssl problem than stunnel unless you can think of a way to 1) make it not wipe out my random file 2) make it not try and access a socket I hope you put my little fix in to s_log. Thanks, Eric At 01:51 PM 10/2/2006, you wrote: >On Monday 02 October 2006 21:19, you wrote: > > Are you an openssl/stunnel expert? > >I wrote stunnel. I could say I'm an expert (who an expert is otherwise?). > > > If I gave you access to my rs6000 > > and paid you, could you get this to work for me? Since I only need > > to compil this every 5-10 years, it makes little sense for me to > > invest a lot of time learning it! > >Good idea. > >Best regards, > Mike > This email sent by: Eric S. Eberhard (928) 567-3727 Voice (928) 567-6122 Fax 928-301-7537 -- you may call any time day or night, I turn it off when I sleep :-) Please try to use a land line first (reception often poor). Note the change in the domain from vicspdi.com to vicsmba.com !!!! For Metropolis support and VICS MBA Support!!!! http://www.vicsmba.com Completely updated web site of personal pictures with many new pictures! Includes horses, dogs, Corvairs, and more. http://www.vicsmba.com/ourpics/index.html Corvair pictures including the Judson setup on our 62 Sedan and lots of pictures of Cheryl's 62 Monza Wagon and our 62 Spyder convertible. http://www.vicsmba.com/ourpics/corvairs.html My younger brother Martin has started a very serious car company. A hot rod (very fast) electric roadster is the first offering. The chassis is built by Lotus to their specs. Check it out: http://www.teslamotors.com

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Help please - debug and random file
by Eric S. Eberhard 02 Oct '06

02 Oct '06

Hello everyone. I have not been on the list for a long time. I last compiled openssl and stunnel in 2000 or so and have been using the same code ever since. I use it very simply in client mode ... I have an application to authorize credit cards and it connect to stunnel in inetd mode (with -c in the command line). visanet is now requiring version 2 SSL so I have to change so I got all the new stuff and compiled it up and made a .conf file. I have two problems (for now :-) ): 1) No matter what I do it seems that at least some debug is coming back through the socket, and no debug is going to my debug file 2) The debug I am getting is very strange -- the first time it says "Snagged 64 from bytes from stunnel.rnd" The second time it says "Unable to retrieve any random data from stunnel.rnd" When I examine the file it has a current date and zero bytes. If I copy back my old (2000) stunnel.rnd it always reads once, and then writes it back out with zero bytes. I am AIX 4.3.3 and I compiled with xlc and the only option I used that was not default was to not link in the wrappers. I did get a ton of warnings that the "-pthreaded" option was not valid ... but it executes and responds so I am not sure that matters? Or should I do something (what?) about that? My configuration files for the service (visanet) is: output = /tmp/stunnel.log debug = 7 RNDfile = /visanet/ssl/stunnel.rnd [visanet] client = yes connect = ssllab.pgs.wcom.net:443 sslVersion = SSLv2 protocol = smtp cert = /viasanet/ssl/stunnel.pem The rnd file and cert file are from 2000 (old old old!). I would have expected a file /tmp/stunnel.log -- the file is not even created! The old inetd line was: (blah blah) stunnel -r ssllab.pgs.wcom.net:443 -c -R /visanet/sslold/stunnel.rnd What stupid thing am I doing wrong? Does anyone else have experience using stunnel with visanet and can they give me any pointers? Thanks! Eric This email sent by: Eric S. Eberhard (928) 567-3727 Voice (928) 567-6122 Fax 928-301-7537 -- you may call any time day or night, I turn it off when I sleep :-) Please try to use a land line first (reception often poor). Note the change in the domain from vicspdi.com to vicsmba.com !!!! For Metropolis support and VICS MBA Support!!!! http://www.vicsmba.com Completely updated web site of personal pictures with many new pictures! Includes horses, dogs, Corvairs, and more. http://www.vicsmba.com/ourpics/index.html Corvair pictures including the Judson setup on our 62 Sedan and lots of pictures of Cheryl's 62 Monza Wagon and our 62 Spyder convertible. http://www.vicsmba.com/ourpics/corvairs.html My younger brother Martin has started a very serious car company. A hot rod (very fast) electric roadster is the first offering. The chassis is built by Lotus to their specs. Check it out: http://www.teslamotors.com

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One bug solved/fixed -- bug in log.c or perhaps options.c
by Eric S. Eberhard 02 Oct '06

02 Oct '06

Because I am using inetd mode, any unintended output by stunnel to stdout is BAD as this is accepted as input through inetd to my calling program. The problem with stunnel is that in main it does main_initialize which has the final function "log_open" However, somewhere in "parse_config" a call is made to "s_log" (with the text "Snagged 64 bytes from ..." and since this is before the log_open, the output ends up on stdout rather than being logged. Rather than try and hunt down the function that outputs the premature error message, I modified s_log to open the log files itself if not already open. I fixed it as follows (suggest you put in to the release?): void s_log(int level, const char *format, ...) { va_list arglist; char text[STRLEN], timestamped[STRLEN]; time_t gmt; struct tm *timeptr; #if defined(HAVE_LOCALTIME_R) && defined(_REENTRANT) struct tm timestruct; #endif if(level>options.debug_level) return; va_start(arglist, format); #ifdef HAVE_VSNPRINTF vsnprintf(text, STRLEN, format, arglist); #else vsprintf(text, format, arglist); #endif va_end(arglist); #if !defined (USE_WIN32) && !defined (__vms) /******************** NEW CODE, NEXT 2 LINES *******/ if(!outfile && options.output_file) /* 'output' option specified, not open */ log_open(); if(!outfile && options.option.syslog) { syslog(level, "LOG%d[%lu:%lu]: %s", So now I don't get the "Snagged" message back on stdout ... but it still does not work for me (yet :-) ) Eric This email sent by: Eric S. Eberhard (928) 567-3727 Voice (928) 567-6122 Fax 928-301-7537 -- you may call any time day or night, I turn it off when I sleep :-) Please try to use a land line first (reception often poor). Note the change in the domain from vicspdi.com to vicsmba.com !!!! For Metropolis support and VICS MBA Support!!!! http://www.vicsmba.com Completely updated web site of personal pictures with many new pictures! Includes horses, dogs, Corvairs, and more. http://www.vicsmba.com/ourpics/index.html Corvair pictures including the Judson setup on our 62 Sedan and lots of pictures of Cheryl's 62 Monza Wagon and our 62 Spyder convertible. http://www.vicsmba.com/ourpics/corvairs.html My younger brother Martin has started a very serious car company. A hot rod (very fast) electric roadster is the first offering. The chassis is built by Lotus to their specs. Check it out: http://www.teslamotors.com

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Setting up TLS for SMTP
by James Brown 01 Oct '06

01 Oct '06

I am trying to set up stunnel so that it accepts SSL encrypted traffic from the internet on port 2525 and sends it to my mail server on port 25. To create the certificate, I used: sudo openssl req -new -outform PEM -out smtpd.cert \ -newkey rsa:2048 -nodes -keyout smtpd.key -keyform PEM \ -days 365 -x509 My stunnel.conf is: ; Sample stunnel configuration file by Michal Trojnara 2002-2006 ; Some options used here may not be adequate for your particular configuration ; Certificate/key is needed in server mode and optional in client mode ; The default certificate is provided only for testing and should not ; be used in a production environment ;cert = stunnel.pem cert = /smtpd.cert ;key = stunnel.pem key = /smtpd.key ; Some performance tunings socket = l:TCP_NODELAY=1 socket = r:TCP_NODELAY=1 ; Workaround for Eudora bug ;options = DONT_INSERT_EMPTY_FRAGMENTS ; Authentication stuff ;verify = 2 ; Don't forget to c_rehash CApath ;CApath = certs ; It's often easier to use CAfile ;CAfile = certs.pem ; Don't forget to c_rehash CRLpath ;CRLpath = crls ; Alternatively you can use CRLfile ;CRLfile = crls.pem ; Some debugging stuff useful for troubleshooting ;debug = 7 ;output = stunnel.log ; Use it for client mode ;client = yes ; Service-level configuration ;[pop3s] ;accept = 995 ;connect = 110 ;[imaps] ;accept = 993 ;connect = 143 ;[ssmtp] ;accept = 465 ;connect = 25 ;[https] ;accept = 443 ;connect = 80 ;TIMEOUTclose = 0 ; vim:ft=dosini I am trying it in standalone mode. Using Stunnel 4.04. OpenSSL 0.9.7i 14 Oct 2005 Output of gcc -v is: Using built-in specs. Target: powerpc-apple-darwin8 Configured with: /private/var/tmp/gcc/gcc-5341.obj~1/src/configure -- disable-checking -enable-werror --prefix=/usr --mandir=/share/man -- enable-languages=c,objc,c++,obj-c++ --program-transform-name=/^[cg] [^.-]*$/s/$/-4.0/ --with-gxx-include-dir=/include/c++/4.0.0 --with- slibdir=/usr/lib --build=powerpc-apple-darwin8 --host=powerpc-apple- darwin8 --target=powerpc-apple-darwin8 Thread model: posix gcc version 4.0.1 (Apple Computer, Inc. build 5341) Whenever I try to start Stunnel, I get a message saying that there is no such file. Eg: $ stunnel -p /smtpd.cert -d 2525 -r 25 2006.10.01 00:36:46 LOG3[638:2684415368]: -p: No such file or directory (2) Syntax: stunnel [filename] | -help | -version | -sockets filename - use specified config file instead of /sw/etc/ stunnel/stunnel.conf -help - get config file help -version - display version and defaults -sockets - display default socket options I am using Mac OS X 10.4.8, Stunnel was built using Fink. Does anybody have any suggestions as to what I am doing wrong? Thanks, James.

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