- stunnel-users - stunnel.org

pop3 stunnel nmh to gmail
by Joseph Brenner 27 Sep '10

27 Sep '10

I'm an nmh user running ubuntu jaunty, and I want to get my local email working over SSL connections to a gmail account (POP3/SMTP). So I'm trying to get some form of mh to talk over SSL using stunnel4. I'm looking for suggestions on what I might be doing wrong, and hints on how to go about isolating the problems. I've succeeded in using slypheed to get mail from gmail, so I know the gmail account is working and is set-up for pop3 and so on. When I run mh's inc command, though, it just reports: "inc: no servers available" I can see that I've got stunnel running by doing a: ps ax | egrep stun | egrep -v egrep 5937 ? SN 0:00 /usr/bin/stunnel4 /etc/stunnel/stunnel.conf 5938 ? SN 0:00 /usr/bin/stunnel4 /etc/stunnel/stunnel.conf 5939 ? SN 0:00 /usr/bin/stunnel4 /etc/stunnel/stunnel.conf 5940 ? SN 0:00 /usr/bin/stunnel4 /etc/stunnel/stunnel.conf 5941 ? SN 0:00 /usr/bin/stunnel4 /etc/stunnel/stunnel.conf 5942 ? SNs 0:00 /usr/bin/stunnel4 /etc/stunnel/stunnel.conf Google has some instructions up about servers and port numbers (but no examples specific to stunnel): http://mail.google.com/support/bin/answer.py?hl=en&answer=13287 Here's a summary of the kind of configurations I've been trying: /etc/default/stunnel4: ENABLED=1 FILES="/etc/stunnel/*.conf" OPTIONS="" PPP_RESTART=0 /etc/stunnel/stunnel.conf: sslVersion = SSLv3 chroot = /var/lib/stunnel4/ setuid = stunnel4 setgid = stunnel4 pid = /stunnel4.pid socket = l:TCP_NODELAY=1 socket = r:TCP_NODELAY=1 debug = 7 output = /var/log/stunnel4/stunnel.log client = yes [pop3s] accept = 127.0.0.1:995 connect = pop.gmail.com:110 [smtps] accept = 127.0.0.1:465 connect = smtp.gmail.com:25 /etc/nmh/mts.conf: mts: smtp hostable: /etc/nmh/hosts localname: smtp.gmail.com # localname: gmail.com masquerade: mmdfldir: /var/mail mmdflfil: # pophost: localhost # pophost: pop.gmail.com:995 pophost: pop.gmail.com:110 # pophost: pop.gmail.com # servers: localhost servers: smtp.gmail.com /var/log/stunnel4/stunnel.log 2010.09.21 11:11:41 LOG7[6528:140533218399984]: Snagged 64 random bytes from /dev/urandom 2010.09.21 11:11:41 LOG7[6528:140533218399984]: RAND_status claims sufficient entropy for the PRNG 2010.09.21 11:11:41 LOG7[6528:140533218399984]: PRNG seeded successfully 2010.09.21 11:11:41 LOG7[6528:140533218399984]: SSL context initialized for service pop3s 2010.09.21 11:11:41 LOG7[6528:140533218399984]: SSL context initialized for service imaps 2010.09.21 11:11:41 LOG7[6528:140533218399984]: SSL context initialized for service smtps 2010.09.21 11:11:41 LOG5[6528:140533218399984]: stunnel 4.22 on x86_64-pc-linux-gnu with OpenSSL 0.9.8g 19 Oct 2007 2010.09.21 11:11:41 LOG5[6528:140533218399984]: Threading:PTHREAD SSL:ENGINE Sockets:POLL,IPv6 Auth:LIBWRAP 2010.09.21 11:11:41 LOG6[6528:140533218399984]: file ulimit = 1024 (can be changed with 'ulimit -n') 2010.09.21 11:11:41 LOG6[6528:140533218399984]: poll() used - no FD_SETSIZE limit for file descriptors 2010.09.21 11:11:41 LOG5[6528:140533218399984]: 500 clients allowed 2010.09.21 11:11:41 LOG7[6528:140533218399984]: FD 10 in non-blocking mode 2010.09.21 11:11:41 LOG7[6528:140533218399984]: FD 11 in non-blocking mode 2010.09.21 11:11:41 LOG7[6528:140533218399984]: FD 12 in non-blocking mode 2010.09.21 11:11:41 LOG7[6528:140533218399984]: SO_REUSEADDR option set on accept socket 2010.09.21 11:11:41 LOG7[6528:140533218399984]: pop3s bound to 127.0.0.1:1109 2010.09.21 11:11:41 LOG7[6528:140533218399984]: FD 13 in non-blocking mode 2010.09.21 11:11:41 LOG7[6528:140533218399984]: SO_REUSEADDR option set on accept socket 2010.09.21 11:11:41 LOG7[6528:140533218399984]: imaps bound to 0.0.0.0:993 2010.09.21 11:11:41 LOG7[6528:140533218399984]: FD 14 in non-blocking mode 2010.09.21 11:11:41 LOG7[6528:140533218399984]: SO_REUSEADDR option set on accept socket 2010.09.21 11:11:41 LOG7[6528:140533218399984]: smtps bound to 127.0.0.1:259 2010.09.21 11:11:41 LOG7[6534:140533218399984]: Created pid file /stunnel4.pid /var/log/mail.log Sep 21 13:40:32 fineline gnu-pop3d[15484]: Incoming connection opened Sep 21 13:40:32 fineline gnu-pop3d[15484]: connect from 127.0.0.1 Sep 21 13:40:32 fineline gnu-pop3d[15484]: User `doomvox(a)gmail.com': nonexistent Sep 21 13:40:32 fineline gnu-pop3d[15484]: Session ended for no user I'm using the "stunnel4" package for ubuntu jaunty: /usr/bin/stunnel4 -version stunnel 4.22 on x86_64-pc-linux-gnu with OpenSSL 0.9.8g 19 Oct 2007 Threading:PTHREAD SSL:ENGINE Sockets:POLL,IPv6 Auth:LIBWRAP Global options debug = 5 pid = /var/run/stunnel4.pid RNDbytes = 64 RNDfile = /dev/urandom RNDoverwrite = yes Service-level options cert = /etc/stunnel/stunnel.pem ciphers = AES:ALL:!aNULL:!eNULL:+RC4:@STRENGTH key = /etc/stunnel/stunnel.pem session = 300 seconds stack = 65536 bytes sslVersion = SSLv3 for client, all for server TIMEOUTbusy = 300 seconds TIMEOUTclose = 60 seconds TIMEOUTconnect = 10 seconds TIMEOUTidle = 43200 seconds verify = none uname -a Linux fineline 2.6.24-16-generic #1 SMP Thu Apr 10 12:47:45 UTC 2008 x86_64 GNU/Linux gcc -v Using built-in specs. Target: x86_64-linux-gnu Configured with: ../src/configure -v --with-pkgversion='Ubuntu 4.3.3-5ubuntu4' --with-bugurl=file:///usr/share/doc/gcc-4.3/README.Bugs --enable-languages=c,c++,fortran,objc,obj-c++ --prefix=/usr --enable-shared --with-system-zlib --libexecdir=/usr/lib --without-included-gettext --enable-threads=posix --enable-nls --with-gxx-include-dir=/usr/include/c++/4.3 --program-suffix=-4.3 --enable-clocale=gnu --enable-libstdcxx-debug --enable-objc-gc --enable-mpfr --with-tune=generic --enable-checking=release --build=x86_64-linux-gnu --host=x86_64-linux-gnu --target=x86_64-linux-gnu Thread model: posix gcc version 4.3.3 (Ubuntu 4.3.3-5ubuntu4) openssl version OpenSSL 0.9.8g 19 Oct 2007

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Critical error on stunnel 434 for WinCE/Windows Mobile: no service at all, because of failure in thread creation
by Pierre DELAAGE 26 Sep '10

26 Sep '10

Hello Michal, Maybe you remember me, I am the man that refreshed stunnel for winCE up to 4.27 version. Thank you for having included my code to your mainstream at that time. As a win32 regular programmer I always check that my code is as close as possible as that of the main win32 stream for PC. I am writing you today to point out a critical bug that prevent stunnel 4.34 from servicing any service at all . I have fixed that bug and will send you a refresh of all the sources (that needed some after some win32 PC version updates) soon. SO DO NOT DO ANYTHING. the bug is in sthread.c: the wince _beginthread port has been modified (by someone else but me) as this : v434: handle=CreateThread(NULL, stack_size, (LPTHREAD_START_ROUTINE)start_address, arglist, STACK_SIZE_PARAM_IS_A_RESERVATION, &thread_id); the "STACK_SIZE_PARAM_IS_A_RESERVATION" flag is the novelty from 4.27. The problem is that beginthread is being called from gui.c with stacksize=0 SO THAT a stack of 0 size "TRIES to be RESERVED" and then CreateThread FAILS to return a valid handle. That is to say that no thread is created, and thus NO TUNNELING SERVICE at all can be delivered. So stunnel cannot work at all. Solution : the proper call is : handle=CreateThread(NULL, stack_size, (LPTHREAD_START_ROUTINE)start_address, arglist, (stack_size > 0) ? STACK_SIZE_PARAM_IS_A_RESERVATION:0, &thread_id); I repeat and insist : please DO NOT DO anything to the code, as I will send soon a refresh with various other updates (because apart from that critical bug, the code needs other refresh to compile properly), and as I am also working on a refresh of openssl up to 1.0.0a (those gentlemen at openssl never included any wce patch to their mainstream, which is really a pity, but another story). See you soon, Thank you again for all the work you do for the community of people, Pierre

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stunnel v4.32 & mac v10.6.3
by Cherry Ngai 25 Sep '10

25 Sep '10

Hello, I am new to stunnel. My stunnel v4.32 is installed to my mac v10.6.3 using MacPort. I am trying to setup active directory, but there is no process start when i run sudo /opt/local/bin/stunnel /opt/local/etc/stunnel/stunnel.conf There is no error msg after i run the command. I believe it could have something to do with my configuration? Having it running in debug mode, I can't find the created output file. Could someone help me? Or tell me where i can find the output file? Thanks! Stunnel seems successfully installed, as it has returned the following with the command "sudo stunnel -version" stunnel 4.32 on i686-apple-darwin10.3.0 with OpenSSL 1.0.0a 1 Jun 2010 Threading:PTHREAD SSL:ENGINE Sockets:SELECT,IPv6 Auth:LIBWRAP Global options debug = daemon.notice pid = /opt/local/var/run/stunnel/stunnel.pid RNDbytes = 64 RNDfile = /dev/urandom RNDoverwrite = yes Service-level options cert = /opt/local/etc/stunnel/stunnel.pem ciphers = ALL:!aNULL:!eNULL:!SSLv2 session = 300 seconds stack = 65536 bytes sslVersion = SSLv3 for client, all for server TIMEOUTbusy = 300 seconds TIMEOUTclose = 60 seconds TIMEOUTconnect = 10 seconds TIMEOUTidle = 43200 seconds verify = none Here is my config: cert = /opt/local/etc/stunnel/stunnel.pem key = /opt/local/etc/stunnel/stunnel.pem sslVersion = SSLv3 chroot = /opt/local/var/lib/stunnel/ setuid = nobody setgid = nogroup pid = /stunnel.pid socket = l:TCP_NODELAY=1 socket = r:TCP_NODELAY=1 debug = 7 output = stunnel.log client = yes [ActiveDirectory1] accept = 391 connect = SOME_IP:636 Cheers, Cherry

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Target version/timeframe for drawing identity certs from Windows cert store?
by Bucci, David G 22 Sep '10

22 Sep '10

Hi - in an exchange last week, Michal, it sounded like you might be planning on adding the capability/option to the Windows version to select an identity certificate from the Windows certificate store (because it turns out OpenSSL added some supporting infrastructure for doing so, if I understood correctly). For planning purposes, do you have any sense yet of whether that's really going to happen, and in what timeframe or what target version? I think that'd be a change of high interest to a lot of people ... one suggestion, it would help integrators if there was a way to configure a msg into whatever selection dialog that comes up, asking the user to select a certificate from their identity store. Thinking out loud -- probably also, in the case where multiple client tunnels are being set up, a way to make it either a global selection (for all client services), or a service specific selection -- hmm, though global only is probably fine, thinking about, since an integrator could always create a 2nd config, if a 2nd tunnel is needed Thinking further, you would probably want to be careful that it would work early on during login, since I imagine like us, integrators would want to start it from a user's Startup folder, or from a login script. I don't know Windows well enough to know if that constrains you (if the window mgr is up during login script exec, etc.). Thx! ---- David G. Bucci If you can't think of anything kind to say, could you at least have the decency to be vague?

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Server side logging, no connection details logged
by Bucci, David G 22 Sep '10

22 Sep '10

Hi - using Stunnel to enforce client certificate based authentication, and as part of that, we want to log accesses, and the CN used to access, on the server side (kind of an audit log). On the client side, with debug set to 7, we get details about the connection, the SSL steps in the handshake, etc. - but on the server side, even with debug = 7, we're not seeing any info at all about the connections that are occurring. Sooo ... is there a way to enable such logging on the server side of the tunnel? Or possibly turn on independent logging in the OpenSSL libs that are used? I looked, but haven't found anything online about this. Thx! ---- David G. Bucci If you can't say anything nice, at least have the decency to be vague.

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FIPS compliance
by Bucci, David G 21 Sep '10

21 Sep '10

The documentation on fips= seems ambiguous to me ... does leaving it at the default of "yes" /prevent/ FIPS 140-2 compliance mode, or mandate it? Or does it do something else I'm not understanding? Basically, the q. is, what do you have to configure to ensure that you're operating in a FIPS 140-2 compliant manner (at least, as the version of OpenSSL libs bundled understood it)? Do you have to specify ciphers that are validated, etc.? Or just set that config option to "yes" ("no"?)? And how can one tell if the stunnel binary in use was compiled with FIPS support active? (I'm using the Windows 4.33 binary d/l'ed from mirt.net) Tia! ---- David G. Bucci Chuck Norris can kick through all 6 degrees of separation, hitting anyone, anywhere, in the face, at any time. -- ChuckNorrisFacts.com

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Large performance difference: Solaris vs Linux
by Cliffe, Stephen 20 Sep '10

20 Sep '10

Hi, I've just been comparing the performance of stunnel on Solaris 10 & Linux (Centos 5.5) and am seeing a big difference. I'm using stunnel 4.33 compiled with the same options on both platforms and the tcpstress benchmarking tool (http://stunnel.mirt.net/?page=perf) On a Dell 780 running Solaris 10 I got 163.31 connections/second but on an older, slower Dell 620 running Linux I got 408.01 connections/second. Both machines were otherwise idle. Does anyone know why there would be such a big difference between the two OS's? Thanks, Steve. Steve Cliffe Senior Engineer - Development Infrastructure Team Andrew Network Solutions Asia Pacific [ Address : Andrew Corporation Building (39), Northfields Avenue, Wollongong University, NSW, Australia 2500 ] [ Postal Address : PO Box U40, Wollongong University, NSW, Australia 2500 ] [ Tel : +61 2 4221 2991] [ Fax : +61 2 4221 2901 ] [ Email : Stephen.Cliffe(a)andrew.com] Visit Andrew on the Web at www.andrew.com<http://www.andrew.com/> [cid:image001.gif@01CB5688.22C2E4D0][cid:image002.gif@01CB5688.22C2E4D0]

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Generically referencing file locations in stunnel.conf
by Bucci, David G 20 Sep '10

20 Sep '10

Hi - I'm back to trying to run Stunnel with a different user certificate for each user. So far, the best technique I've found is to have a separate stunnel.conf for each user (in their home directory, which is referenced by envvar %USERPROFILE%), and run stunnel using that configuration file. As part of that, I'm trying to generically reference file locations (log, user certificates) in the .conf. But I haven't found a way short of fully pathing the locations in the .conf e.g. "output=c:\users\dbucci\stunnel\stunnel.log". That's undesirable, because it means I have to make every user's .conf unique. So ... is there a generic way to accomplish this? I've tried setting the "Start In" location in the Windows shortcut to that location (via envvar %USERPROFILE%, which allows me to make every user's shortcut generic), then saying "output=.\stunnel.log", but without success - it seems to always be using c:\program files\stunnel as it's starting point for reference. Likewise, the envvar isn't usable in the .conf Note that I thought about creating a subdir per user in C:\program files\stunnel (with appropriate perms for that user), but can't, because in many of our deployment locations, users aren't permitted to write to c:\program files. Btw, this is why I'm asking about the commandline parms in Windows - I don't seem to be able to get them to work, but if I could, I could say e.g. "-o %USERPROFILE%\stunnel\stunnel.log", and that would work generically for every user. Likewise, I could use "-A %USERPROFILE&\stunnel\usercert.pem" and have a generic way of installing user certs. Heck, if I could set ALL the options via command line (-c, -r, etc.) I would love to simply do away with a user-specific .conf file. So ... sorry for rambling a bit, but any help with the intent of what I'm trying to accomplish, make as generic as possible a user-specific config setup? Thx! ---- David G. Bucci Chuck Norris can kick through all 6 degrees of separation, hitting anyone, anywhere, in the face, at any time. -- ChuckNorrisFacts.com

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Command line args available on Windows version 4.33?
by Bucci, David G 20 Sep '10

20 Sep '10

Hi - are all the command line arguments documented at http://www.stunnel.org/faq/args.html#ToC1 available in the Windows 4.33 version? When you execute stunnel -V, very few are listed. And if they are available, do they take precedence over a configuration file, if one is used? (Is a .conf mandatory, or can you set all the required options via command line in the Windows version?) Thx! ---- David G. Bucci Chuck Norris can kick through all 6 degrees of separation, hitting anyone, anywhere, in the face, at any time. -- ChuckNorrisFacts.com

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Accept connections only from local processes?
by Bucci, David G 20 Sep '10

20 Sep '10

Hi - I'm looking to configure Stunnel in client mode to accept connections only from the PC it's running on. Would the config option "socket = a:SO_BINDTODEVICE=lo" accomplish that? And would this work on Windows? (is there a "lo" interface on Windows?) I'm going to do some testing, but thought I'd ask in case someone already knows I'll be pounding sand. And before anyone asks, turning on a firewall isn't an option - we don't have control of all the PCs involved. ---- David G. Bucci Chuck Norris can kick through all 6 degrees of separation, hitting anyone, anywhere, in the face, at any time. -- ChuckNorrisFacts.com

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