- stunnel-users - stunnel.org

Does stunnel supports IPv6
by Ravi Gowda 14 Nov '06

14 Nov '06

Hi All, Can we use ipv6 addresses in stunnel? The problem that I am facing is I want to have secure ldap sessions using two IPv6 systems but none of them speak SSL... How to go about it??? Thanks in Advance Ravi Gowda

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Error when I try adding compression to stunnel.conf
by Rami Michael 14 Nov '06

14 Nov '06

Hey everyone, I was going through the stunnel FAQ when I noticed you could add compression. I was very excited and wanted to give it a try but when I tried to add compression = zlib to my stunnel.cong I got this error when starting stunnel... Starting stunnel: file /etc/stunnel/stunnel.conf line 10: Specified option name is not valid here Line 10 is the exact place where i stuck this name value pair. I don't know where else i could put it, i tried putting it everywhere! All requested info for posts to the group are found below Here is my stunnel.conf verify = 3 CAfile = /etc/stunnel/certs.pem cert = /etc/stunnel/stunnel.pem setuid = nobody setgid = nobody pid = /tmp/stunnel.pid debug = 7 output = /var/log/stunnel.log client = no compression = zlib [mysqls] accept = 3309 connect = 3306 I am using centOS and installed stunnel and openssl via the available rpms, using yum. zlib is installed as well, but i don't think this is a zlib issue, it seems like it just doesn't like "compression". Was compression added in a version later than 4.05? Am i missing something incredinbly simple? Some output from the stunnel.log at high debug level 2006.11.13 23:03:10 LOG5[32244:3086689984]: stunnel 4.05 on i686-redhat-linux-gnu PTHREAD+LIBWRAP with OpenSSL 0.9.7a Feb 19 2003 2006.11.13 23:03:10 LOG7[32244:3086689984]: Snagged 64 random bytes from /dev/urandom 2006.11.13 23:03:10 LOG7[32244:3086689984]: RAND_status claims sufficient entropy for the PRNG 2006.11.13 23:03:10 LOG6[32244:3086689984]: PRNG seeded successfully 2006.11.13 23:03:10 LOG7[32244:3086689984]: Certificate: /etc/stunnel/stunnel.pem 2006.11.13 23:03:10 LOG7[32244:3086689984]: Key file: /etc/stunnel/stunnel.pem 2006.11.13 23:03:10 LOG7[32244:3086689984]: Loaded verify certificates from /etc/stunnel/certs.pem 2006.11.13 23:03:10 LOG5[32244:3086689984]: FD_SETSIZE=1024, file ulimit=1024 -> 500 clients allowed 2006.11.13 23:03:10 LOG7[32244:3086689984]: FD 4 in non-blocking mode 2006.11.13 23:03:10 LOG7[32244:3086689984]: SO_REUSEADDR option set on accept socket 2006.11.13 23:03:10 LOG7[32244:3086689984]: mysqls bound to 0.0.0.0:3309 2006.11.13 23:03:10 LOG7[32244:3086689984]: FD 5 in non-blocking mode 2006.11.13 23:03:10 LOG7[32244:3086689984]: FD 6 in non-blocking mode 2006.11.13 23:03:10 LOG7[32245:3086689984]: Created pid file /tmp/stunnel.pid stunnel -V 2006.11.13 23:03:14 LOG3[32248:3086505664]: -V: No such file or directory (2) Syntax: stunnel [filename] | -fd [n] | -help | -version | -sockets filename - use specified config file instead of /etc/stunnel/stunnel.conf -fd n - read the config file from specified file descriptor -help - get config file help -version - display version and defaults -sockets - display default socket options uname -a Linux ramison 2.6.9-42.0.3.EL #1 Fri Oct 6 05:59:54 CDT 2006 i686 i686 i386 GNU/Linux gcc -v Reading specs from /usr/lib/gcc/i386-redhat-linux/3.4.6/specs Configured with: ../configure --prefix=/usr --mandir=/usr/share/man --infodir=/usr/share/info --enable-shared --enable-threads=posix --disable-checking --with-system-zlib --enable-__cxa_atexit --disable-libunwind-exceptions --enable-java-awt=gtk --host=i386-redhat-linux Thread model: posix gcc version 3.4.6 20060404 (Red Hat 3.4.6-3) openssl version OpenSSL 0.9.7a Feb 19 2003

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setting up HTTPS service?
by joe＠strout.net 13 Nov '06

13 Nov '06

Complete newbie here, so please bear with me. I want to set up HTTPS service on a Mac OS X (10.4.7) machine running a custom web server. I imagine that Stunnel could be made to listen on the standard HTTPS port (443), do the encryption/decryption, and pass the resulting data to/from the HTTP port (80, or a custom port I specify). This is probably very easy, but none of the documentation or examples I found covered this. Has anyone done this? Or if not, can you sketch out how I would go about it? Any gotchas or caveats I should be aware of? Many thanks, - Joe

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resending FD_SETSIZE and file ulimit
by Arunkumar Arumugam 10 Nov '06

10 Nov '06

Hi Guys - I have a stunnel setup in a linux box kernel 2.4 Advanced sever release 2.1AS (pensacola) . I am trying to increase the number of file descriptors with which stunnel could handle. So I did a ulimit -n 4096 for root and restarted the stunnel process. Now in the stunnel logs i see, ..... FD_SETSIZE=1024, file ulimit=4096- > 500 clients allowed. I dont completely understand the relation between FD_SETSIZE and file ulimit. I also read that a single stunnel connection might use around 2 or 3 file descriptors. So what is the cap on the number of file descriptors used by stunnel. To make it use , around 4096 file descriptors should i recompile the stunnel again with FD_SETSIZE set to 4096.? -- ARUN ARUMUGAM Galbraith's Law of Human Nature: Faced with the choice between changing ones' mind and proving that there is no need to do so, almost everybody gets busy on the proof.

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stunnel on Windows with pkcs11
by Neil M. 10 Nov '06

10 Nov '06

Can anyone provide more details in how to get this setup working? I've setup stunnel in client mode just fine for normal SSL operations, but now I need to load a client certificate from a token. I've looked at the example in the documentation and changed the paths accordingly, but that doesn't seem to work, stunnel errors out complaining about a DSO. Neil

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FD_SETSIZE and file ulimit
by Arunkumar Arumugam 10 Nov '06

10 Nov '06

Hi Guys - I have a stunnel setup in a linux box kernel 2.4 Advanced sever release 2.1AS (pensacola) . I am trying to increase the number of file descriptors with which stunnel could handle. So I did a ulimit -n 4096 for root and restarted the stunnel process. Now in the stunnel logs i see, ..... FD_SETSIZE=1024, file ulimit=4096- > 500 clients allowed. I dont completely understand the relation between FD_SETSIZE and file ulimit. I also read that a single stunnel connection might use around 2 or 3 file descriptors. So what is the cap on the number of file descriptors used by stunnel. To make it use , around 4096 file descriptors should i recompile the stunnel again with FD_SETSIZE set to 4096.? -- ARUN ARUMUGAM Galbraith's Law of Human Nature: Faced with the choice between changing ones' mind and proving that there is no need to do so, almost everybody gets busy on the proof.

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stunnel 4.16 wrapped around an ldap server causing very slow binds
by Mark McCoy 05 Nov '06

05 Nov '06

Hey all, I have an instance of stunnel 4.16 on Solaris 10 that I am trying to use to wrap Sun Directory Server LDAP traffic in SSL. LDAP 'binds' take over 2 minutes to complete using stunnel, but only a split second (as they should) when using an SSH tunnel. I have disabled tcpwrappers per the stunnel FAQ with no results, and tried settting delay = "yes" and "no", with no differences in the results. An interesting thing is that if I try to bind using the wrong password, the "Invalid Credentials" error returns immediately. Using the correct password, the bind hangs for over 2 minutes. Any ideas on what to look for? ------------- Output of stunnel -version: stunnel 4.16 on sparc-sun-solaris2.10 with OpenSSL 0.9.8c 05 Sep 2006 Threading:PTHREAD SSL:ENGINE Sockets:POLL,IPv4 Global options debug = 5 pid = /usr/local/stunnel/var/run/stunnel/stunnel.pid RNDbytes = 64 RNDfile = /dev/urandom RNDoverwrite = yes Service-level options cert = /usr/local/stunnel/etc/stunnel/stunnel.pem ciphers = ALL:!ADH:+RC4:@STRENGTH key = /usr/local/stunnel/etc/stunnel/stunnel.pem session = 300 seconds sslVersion = SSLv3 for client, all for server TIMEOUTbusy = 300 seconds TIMEOUTclose = 60 seconds TIMEOUTconnect = 10 seconds TIMEOUTidle = 43200 seconds verify = none -------------- -- Mark McCoy -- Professional Unix geek Here in America we are descended in blood and in spirit from revolutionists and rebels - men and women who dared to dissent from accepted doctrine. As their heirs, may we never confuse honest dissent with disloyal subversion. -- Dwight D. Eisenhower

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newbie sendmail + smtp question
by Fred nietzsche 03 Nov '06

03 Nov '06

My ISP requires all my mail to go to mail.myISP.net via SSL to port 465. I have sendmail compiled with STARTTLS, configured authinfo and I've set up sendmail's smarthost to send everything to mail.myISP.net I run stunnel like this. stunnel /etc/stunnel/stunnel.conf -c -d 25 -r mail.myISP.net:465 There are no errors in the log. I can see stunnel listening on 25 with netstat. When I try to send mail I get: bash-3.00# sendmail -v sc00b123(a)yahoo.com <test sc00b123(a)yahoo.com... Connecting to [127.0.0.1] via relay... Which just hangs for ever. My stunnel.conf looks like: cert = /etc/stunnel/mail.pem chroot = /var/stunnel/ setuid = nobody setgid = nogroup pid = /stunnel.pid socket = l:TCP_NODELAY=1 socket = r:TCP_NODELAY=1 debug = 7 output = /var/log/stunnel.log [smtp] accept = 25 connect = 465 Thanks for any help, hints, etc.. --------------------------------- Low, Low, Low Rates! Check out Yahoo! Messenger's cheap PC-to-Phone call rates.

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stunnel[2840]: Error binding pop3s to 0.0.0.0:995
by fxper 02 Nov '06

02 Nov '06

I'm trying to use stunnel on a redhat machine to securely check email, via xinetd via pop3d. My /etc/xinetd.d/pop3s looks like this: service pop3s { socket_type = stream wait = no user = root server = /usr/sbin/stunnel log_on_success += USERID log_on_failure += USERID disable = no } And netstat just shows xinetd on 995: netstat -apn|grep 995 tcp 0 0 0.0.0.0:995 0.0.0.0:* LISTEN 2797/xinetd When I try to check mail with my client hitting port 995, I get this in /var/log/secure using debug level 7: Nov 1 16:17:24 myhostname xinetd[2797]: START: pop3s pid=2840 from=x.x.x.x Nov 1 16:17:54 myhostname stunnel[2840]: stunnel 4.04 on i386-redhat-linux-gnu PTHREAD+LIBWRAP with OpenSSL 0.9.7a Feb 19 2003 Nov 1 16:17:54 myhostname stunnel[2840]: Snagged 64 random bytes from /dev/urandom Nov 1 16:17:54 myhostname stunnel[2840]: RAND_status claims sufficient entropy for the PRNG Nov 1 16:17:54 myhostname stunnel[2840]: PRNG seeded successfully Nov 1 16:17:54 myhostname stunnel[2840]: Certificate: /usr/share/ssl/certs/stunnel.pem Nov 1 16:17:54 myhostname stunnel[2840]: Key file: /usr/share/ssl/certs/stunnel.pem Nov 1 16:17:54 myhostname stunnel[2840]: FD_SETSIZE=1024, file ulimit=1024 -> 500 clients allowed Nov 1 16:17:54 myhostname stunnel[2840]: FD 4 in non-blocking mode Nov 1 16:17:54 myhostname stunnel[2840]: SO_REUSEADDR option set on accept socket Nov 1 16:17:54 myhostname stunnel[2840]: Error binding pop3s to 0.0.0.0:995 Nov 1 16:17:54 myhostname stunnel[2840]: bind: Address already in use (98) Any suggestions? Thanks! --------------------------------- Want to start your own business? Learn how on Yahoo! Small Business.

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How to disable SSLv2
by Tommi Nieminen 30 Oct '06

30 Oct '06

I'm using Stunnel 4.18. I would like to disable SSLv2, but allow SSLv3 and TLSv1. Is this currently possible in Stunnel? I've tried two things so far: first I tried to use the option options = SSL_OP_NO_SSLv2 (from "man SSL_CTX_set_options") It didn't work. This is what I got: 2006.10.27 18:32:48 LOG7[6358:3082897088]: Snagged 64 random bytes from /root/.rnd 2006.10.27 18:32:48 LOG7[6358:3082897088]: Wrote 1024 new random bytes to /root/.rnd 2006.10.27 18:32:48 LOG7[6358:3082897088]: RAND_status claims sufficient entropy for the PRNG 2006.10.27 18:32:48 LOG7[6358:3082897088]: PRNG seeded successfully file /etc/stunnel/stunnel.conf line 18: Illegal SSL option Nothing gets logged, the above is the response to the startup command. The other thing I tried, though I really didn't expect it to work, was replacing the "options" option with sslVersion = SSLv3 TLSv1 This option seems to accept only one version at a time, or alternatively all of them with "all" on the right hand side, so this failed, stunnel didn't start. Any suggestions? The only thing I can think of is that the SSL option SSL_OP_NO_SSLv2 is something that should have been when configuring the OpenSSL installation, and since I have a readily wrapped package, it has not been included there. In that case I could install OpenSSL from the scratch. But before I try that, I thought I would ask if somebody were already familiar with the problem. Tommi Nieminen --------------------------------------------------- Here is the stunnel config file I was using: CAfile = /etc/stunnel/root-cert.pem cert = /etc/stunnel/device-cert.pem key = /etc/stunnel/device-key.pem output = /var/log/stunnel/stunnel.log pid = /var/run/stunnel/stunnel.pid debug = 7 client = no [https] accept = 443 connect = 192.168.10.17:5010 verify = 1 options = SSL_OP_NO_SSLv2 ;sslVersion = SSLv3 TLSv1

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