May 2008 - stunnel-users

Re: [stunnel-users] Stunnel on the same machine
by subrata＠indiatimes.com 31 Jul '11

31 Jul '11

The configuration files are : pid = /var/stunnel.pid ;chroot = /var/lib/stunnel setuid = nobody setgid = nobody foreground =yes ; 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 [mysqls] accept = 3307 connect = 192.168.1.6:3307 On 192.168.1.6 ---------------------- pid = /var/stunnel.pid setuid =nobody setgid = nobody foreground = yes client = no ; Service-level configuration [pop3s] accept = 995 connect = 110 [imaps] accept = 993 connect = 143 [ssmtp] accept = 465 connect = 25 [mysqls] accept =3307 connect =3306 connecting like /usr/local/mysql/bin/mysql -h 127.0.0.1 -u root -p -P 3307 Enter password: On entring password the following lines appear : ERROR 2013 (HY000): Lost connection to MySQL server at 'reading initial communication packet', system error: 104 Subrata ----- Original Message ----- From: Brian Hatch <bri(a)stunnel.org> To: subrata(a)indiatimes.com Sent: Sun, 7 Oct 2007 10:02:17 +0530 (IST) Subject: Re: [stunnel-users] Stunnel on the same machine Near 2007-10-05 22:17 +0530, subrata(a)indiatimes.com insisted: > After starting stunnel and connecting the mysql client/usr/local/mysql/bin/mysql -h 127.0.0.1 -u root -p the flow gets stuck at the Enter password prompt any suggestions how to proceed from there. What do your stunnel configuration files look like? Other problem: mysql client may decide to use a local domain socket when connecting to localhost, thwarting your attempts to go via Stunnel. You might want to 'strace mysql ...' and look for the connect() lines. -- Brian Hatch Time flies like an Systems and arrow. Fruit flies Security Engineer like a banana. http://www.ifokr.org/bri/ Every message PGP signed -- My life has changed. What about yours? Log on to the new Indiatimes Mail and Live out of the Inbox!

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Re: [stunnel-users] rewrite Destination: when rewriting Host:
by Brian Hatch 07 Oct '09

07 Oct '09

Sometime near 2007-11-11 00:15 -0500, Marcio Marchini shouted: > Researching online one can see that WebDAV's spec requires that they > check both src and dest URLs for protocol & port. But with some proxies or > SSL fronts like stunnel, only one of the URLs is rewritten, so one goes as > http and the other as https. Here's one person explaining it, much better > than me: http://svn.haxx.se/users/archive-2006-03/0549.shtml Stunnel doesn't currently have the ability to scan and re-write the plaintext. For HTTP redirects it could possibly be implemented (re-write only the response before ^$, and redirects aren't chunked and don't have content lengths to work with, etc) but you'd still need enough HTTP logic to handle keepalives and such. It's not trivial and not likely. Another option would be to have something already HTTP aware doing the rewriting in between stunnel and subversion. A re-writing proxy. Another option would be to use mod_rewrite in apache to rewrite the urls. But the best way would be to just use SSL inside apache and drop stunnel entirely. -- Brian Hatch The best way to accelerate Systems and a Windows machine is at Security Engineer 9.8 meters per second http://www.ifokr.org/bri/ squared. Every message PGP signed

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stunnel compatibility question
by Jeffrey Buck 04 Jun '08

04 Jun '08

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Re: [stunnel-users] stunnel compatibility question
by Brian Hatch 30 May '08

30 May '08

Right around 2008-05-30 13:51 -0400, Patel Dippen-CDP054 suggested: > Is the true? I have a similar issue. I have never implemented SSL or > Stunnel. But, on whatever readup I have done so far, it seems Stunnel is > a tunneling protocol (IPnIP). So, you do have to have Stunnel on the > other end to extract the IP packet. Stunnel puts data inside SSL, inside TCP. Just like HTTPS is HTTP (data) inside SSL, inside TCP. You can think of the cleartext data inside the SSL tunnel for both of those examples. Yes, the data needs to be extracted from the SSL stream in both cases, but the application that gets it doesn't need to know diddly about it. > I mean if you are saying it will work, that's great news for me. It works if Stunnel is on one side and an SSL client or server is on the other side. > Our Server will have OpenSSL implementation but we plan to deploy > Stunnel on the Client machine. That's what Stunnel is for. -- Brian Hatch "Sorry, sorry, Systems and sorry, much apologizings." Security Engineer http://www.ifokr.org/bri/ Every message PGP signed

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Need class name for stunnel
by Bill Murphy 28 May '08

28 May '08

I'm using stunnel to send and receive emails in a Microsoft Access 2007 application. I would like to be able to programmatically close stunnel when the user exits a form in the application which is used for sending and receiving emails. I can close other programs running in Windows with the code in this api: http://www.mvps.org/access/api/api0025.htm This code requires the "class name" of the application while it is running in Windows in order to close it. Stunnel.exe does not appear to have a class name. I've used the following additional api to display the class names of all currently running apps: http://www.mvps.org/access/api/api0013.htm Stunnel.exe does not show up in the list of running apps produced by this code. Is there another way to determine the stunnel class name? Bill

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Re: [stunnel-users] Problem with Stunnel and OpenBSD
by Juan J. Martínez 23 May '08

23 May '08

Hello, I'm debugging with openssl s_client... >From inside the box: $ openssl s_client -connect blackshell.usebox.net:995 CONNECTED(00000004) depth=0 /C=ES/ST=Valencia/L=Valencia/O=usebox.net/OU=blackshell/CN=blackshell.usebox.net verify error:num=18:self signed certificate verify return:1 depth=0 /C=ES/ST=Valencia/L=Valencia/O=usebox.net/OU=blackshell/CN=blackshell.usebox.net verify return:1 ... And works fine. >From outside: $ openssl s_client -connect blackshell.usebox.net:995 CONNECTED(00000003) (and halts for n minutes) I hope this helps, even I don't know the difference between "CONNECTED(00...4)" and "CONNECTED(00...3)". Regards, Juanjo -- desarrollo y sistemas: http://www.usebox.net/ página personal: http://www.usebox.net/jjm/

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STUNNEL: Thunderbird with Exchange and only inbound port 443
by Fatma 23 May '08

23 May '08

Hello All, A quick question regarding the stunnel ability to work with the following scenario. Scenario is: I have an Exchange Server sitting on the external perimeter with Outlook Web Access (OWA) enabled and it is the frontend and backend mail server as well. And I have a remote client which has a Thunderbird Client (for example) that I need it to connect to the Exchange Server to retrieve emails. The only inbound port to the Exchange Server from a network perspective is HTTPS-443 and no other ports are open on the firewall. Now the question is how can a client thunderbird connect to the Exchange Server/OWA with only 443 port open. So what i was thinking is and tell me if this works? If i install two instances of STUNNEL one on the remote client and one on the exchange server and the following happens. on the client the stunnel listens on port 25 SMTP and encrypts and forwards to port 443 then the server recieves and listens on port 443 and decrypts and forwards to port 110 POP3 will that work actually? hmmm i wish i explained that pretty well. if not then how can it work with the given scenario. cheerz.

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Re: [stunnel-users] Wrapping a mail client - multiple servers
by Ludolf Holzheid 21 May '08

21 May '08

On Wed, 2008-05-21 14:39:42 +0100, Daniel James wrote: > [..] > > Can I, for example, put multiple [SSMTP] sections and multiple [POP3S] > sections in one stunnel.conf? I don't know. But if you can, you don't want to. The section headers don't specify a protocol. They simply give the section a name (for log output, e.g.). There is no problem in naming sections [first-POP3S] and [second-POP3S]. HTH, Ludolf -- --------------------------------------------------------------- Ludolf Holzheid Tel: +49 621 339960 Bihl+Wiedemann GmbH Fax: +49 621 3392239 Floßwörthstraße 41 e-mail: lholzheid(a)bihl-wiedemann.de D-68199 Mannheim, Germany ---------------------------------------------------------------

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Wrapping a mail client - multiple servers
by Daniel James 21 May '08

21 May '08

I use a mail client that does not directly support SSL. I can use stunnel to provide the security layer when I connect to a SSMTP and/or POP3S server (under windows). This works fine, whether I run stunnel as a background application or as a Windows service. I'd like, however, to be able to connect to multiple mail servers over SSL. I'm not sure how I might achieve this? What would be nice would be get stunnel to forward POP3/SMTP communication on different local ports to POP3S/SSMTP on different remote servers. Can I do this? It appears to be possible to run multiple copies of stunnel as applications, and to get each copy to take its configuration from a different stunnel.conf file, so that different copies of stunnel could listen on different local ports and each could proxy the traffic it receives to a different remote server (I haven't tried this -- and it's not an ideal solution -- but it looks as though it should work). It does not appear to be possible, however, to create two instances of the stunnel service running with different configuration files. Is it possible to set up multiple listening ports proxying to different remote servers in a single configuration file? If so, what's the syntax for that? Cheers, Daniel.

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Stunnel 4 Multiple Processes on Ubuntu 8.04
by Armen Ayvazian 19 May '08

19 May '08

Greetings. I'm running the stock stunnel 4.21 on Ubuntu 8.04 (version and configs listed below) as a stand-alone daemon to pass connections between ssl-enabled SMTP, POP3, and IMAP clients and their respective servers, which run on the same machine as stunnel. In previous instances of Stunnel (v4.15) I've managed to successfully get the daemon to switch to a non-root user and use only a single process. I now find, however, that I get 6 processes and 5 continue to run as root with only one (albeit the one listening on the specified sockets) switching down to the specified user. Does anyone have any idea why I both can't set uid/gid and why I've now got so many processes? # ps aux | grep stunnel root 22702 0.0 0.1 3604 428 pts/1 S 11:24 0:00 /usr/bin/stunnel4 /etc/stunnel/stunnel.conf root 22703 0.0 0.1 3604 428 pts/1 S 11:24 0:00 /usr/bin/stunnel4 /etc/stunnel/stunnel.conf root 22704 0.0 0.1 3604 428 pts/1 S 11:24 0:00 /usr/bin/stunnel4 /etc/stunnel/stunnel.conf root 22705 0.0 0.1 3604 428 pts/1 S 11:24 0:00 /usr/bin/stunnel4 /etc/stunnel/stunnel.conf root 22706 0.0 0.1 3604 428 pts/1 S 11:24 0:00 /usr/bin/stunnel4 /etc/stunnel/stunnel.conf stunnel4 22707 0.0 0.2 3720 932 ? Ss 11:24 0:00 /usr/bin/stunnel4 /etc/stunnel/stunnel.conf # lsof -i | grep stunnel stunnel4 22707 stunnel4 11u IPv4 55934 TCP emily:pop3s (LISTEN) stunnel4 22707 stunnel4 12u IPv4 55935 TCP emily:imaps (LISTEN) stunnel4 22707 stunnel4 13u IPv4 55936 TCP emily:ssmtp (LISTEN) I'm invoking stunnel simply as /usr/sbin/stunnel4 /etc/stunnel4/stunnel.conf: cert = /etc/stunnel/stunnel.pem sslVersion = SSLv3 chroot = /var/lib/stunnel4/ setuid = stunnel4 setgid = stunnel4 pid = /stunnel4.pid socket = l:TCP_NODELAY=1 socket = r:TCP_NODELAY=1 [pop3s] accept = 64.5.53.172:995 connect = 64.5.53.172:110 [imaps] accept = 64.5.53.172:993 connect = 64.5.53.172:143 [ssmtp] accept = 64.5.53.172:465 connect = 64.5.53.172:25 Version Info: stunnel 4.21 on i486-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 sslVersion = SSLv3 for client, all for server TIMEOUTbusy = 300 seconds TIMEOUTclose = 60 seconds TIMEOUTconnect = 10 seconds TIMEOUTidle = 43200 seconds verify = none

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