- stunnel-users - stunnel.org

stunnel automatically listening to extra ports: BAD
by Alan Pinstein 11 Jan '08

11 Jan '08

Hi All- I am using stunnel to secure a connection between a local python script using telnetlib and a custom sockets-based server requiring SSL, from local port 4449 to remote port 4449. This is done via: stunnel /opt/www/domains/admin.showcasere.com/showcase/classes/ opensrs-php/stunnel-app.conf where the conf file is: > client = yes > pid = /opt/www/domains/admin.showcasere.com/runtime/stunnel.pid > debug = 7 > [telnet] > accept = 4449 > connect = admin.hostedemail.com:4449 Functionally, everything works for my application, but I am experiencing a bad side-effect. stunnel is ALSO setting up listeners on HTTP and HTTPS ports, and when my daily logrotate scripts run and HUP apache, stunnel steals the web server's ports and the server won't come back up! I had 7 hours of downtime today because of this. I've done a bunch of debugging and can't figure out what's going on. I have only one guess: stunnel automatically listens on any ports that the process calling stunnel is listening on, in some sort of attempt to seamlessly add SSL to existing daemons. I can't find any docs or tell from the source code, but it's the only idea I can't rule out... Here is the debug log of the startup of stunnel (which is run from an apache/php script): Jan 11 13:10:13 bigwoody stunnel: LOG5[13964:3086333632]: stunnel 4.14 on i386-redhat-linux-gnu PTHREAD+POLL+IPv6+LIBWRAP with OpenSSL 0.9.8a 11 Oct 2005 Jan 11 13:10:13 bigwoody stunnel: LOG7[13964:3086333632]: RAND_status claims sufficient entropy for the PRNG Jan 11 13:10:13 bigwoody stunnel: LOG6[13964:3086333632]: PRNG seeded successfully Jan 11 13:10:13 bigwoody stunnel: LOG6[13964:3086333632]: file ulimit = 1024 (can be changed with 'ulimit -n') Jan 11 13:10:13 bigwoody stunnel: LOG6[13964:3086333632]: poll() used - no FD_SETSIZE limit for file descriptors Jan 11 13:10:13 bigwoody stunnel: LOG5[13964:3086333632]: 500 clients allowed Jan 11 13:10:13 bigwoody stunnel: LOG7[13964:3086333632]: FD 31 in non-blocking mode Jan 11 13:10:13 bigwoody stunnel: LOG7[13964:3086333632]: FD 32 in non-blocking mode Jan 11 13:10:13 bigwoody stunnel: LOG7[13964:3086333632]: FD 33 in non-blocking mode Jan 11 13:10:13 bigwoody stunnel: LOG7[13964:3086333632]: SO_REUSEADDR option set on accept socket Jan 11 13:10:13 bigwoody stunnel: LOG7[13964:3086333632]: telnet bound to 0.0.0.0:4449 Jan 11 13:10:13 bigwoody stunnel: LOG7[13965:3086333632]: Created pid file /opt/www/domains/admin.showcasere.com/runtime/stunnel.pid Jan 11 13:10:13 bigwoody stunnel: LOG7[13965:3086333632]: telnet accepted FD=34 from 127.0.0.1:48335 Jan 11 13:10:13 bigwoody stunnel: LOG7[13965:3086330784]: telnet started Jan 11 13:10:13 bigwoody stunnel: LOG7[13965:3086330784]: FD 34 in non-blocking mode Jan 11 13:10:13 bigwoody stunnel: LOG7[13965:3086330784]: FD 35 in non-blocking mode Jan 11 13:10:13 bigwoody stunnel: LOG7[13965:3086330784]: FD 36 in non-blocking mode Jan 11 13:10:13 bigwoody stunnel: LOG7[13965:3086333632]: Cleaning up the signal pipe Jan 11 13:10:13 bigwoody stunnel: LOG6[13965:3086333632]: Child process 13967 finished with code 0 Jan 11 13:10:13 bigwoody stunnel: LOG7[13965:3086330784]: Connection from 127.0.0.1:48335 permitted by libwrap Jan 11 13:10:13 bigwoody stunnel: LOG5[13965:3086330784]: telnet connected from 127.0.0.1:48335 Jan 11 13:10:13 bigwoody stunnel: LOG7[13965:3086330784]: FD 35 in non-blocking mode Jan 11 13:10:13 bigwoody stunnel: LOG7[13965:3086330784]: telnet connecting 216.40.42.6:4449 Jan 11 13:10:13 bigwoody stunnel: LOG7[13965:3086330784]: connect_wait: waiting 10 seconds Jan 11 13:10:13 bigwoody stunnel: LOG7[13965:3086330784]: connect_wait: connected Jan 11 13:10:13 bigwoody stunnel: LOG7[13965:3086330784]: Remote FD=35 initialized Jan 11 13:10:13 bigwoody stunnel: LOG7[13965:3086330784]: SSL state (connect): before/connect initialization Jan 11 13:10:13 bigwoody stunnel: LOG7[13965:3086330784]: SSL state (connect): SSLv3 write client hello A Jan 11 13:10:13 bigwoody stunnel: LOG7[13965:3086330784]: SSL state (connect): SSLv3 read server hello A Jan 11 13:10:13 bigwoody stunnel: LOG7[13965:3086330784]: SSL state (connect): SSLv3 read server certificate A Jan 11 13:10:13 bigwoody stunnel: LOG7[13965:3086330784]: SSL state (connect): SSLv3 read server done A Jan 11 13:10:13 bigwoody stunnel: LOG7[13965:3086330784]: SSL state (connect): SSLv3 write client key exchange A Jan 11 13:10:13 bigwoody stunnel: LOG7[13965:3086330784]: SSL state (connect): SSLv3 write change cipher spec A Jan 11 13:10:13 bigwoody stunnel: LOG7[13965:3086330784]: SSL state (connect): SSLv3 write finished A Jan 11 13:10:13 bigwoody stunnel: LOG7[13965:3086330784]: SSL state (connect): SSLv3 flush data Jan 11 13:10:13 bigwoody stunnel: LOG7[13965:3086330784]: SSL state (connect): SSLv3 read finished A Jan 11 13:10:13 bigwoody stunnel: LOG7[13965:3086330784]: 1 items in the session cache Jan 11 13:10:13 bigwoody stunnel: LOG7[13965:3086330784]: 1 client connects (SSL_connect()) Jan 11 13:10:13 bigwoody stunnel: LOG7[13965:3086330784]: 1 client connects that finished Jan 11 13:10:13 bigwoody stunnel: LOG7[13965:3086330784]: 0 client renegotiatations requested Jan 11 13:10:13 bigwoody stunnel: LOG7[13965:3086330784]: 0 server connects (SSL_accept()) Jan 11 13:10:13 bigwoody stunnel: LOG7[13965:3086330784]: 0 server connects that finished Jan 11 13:10:13 bigwoody stunnel: LOG7[13965:3086330784]: 0 server renegotiatiations requested Jan 11 13:10:13 bigwoody stunnel: LOG7[13965:3086330784]: 0 session cache hits Jan 11 13:10:13 bigwoody stunnel: LOG7[13965:3086330784]: 0 session cache misses Jan 11 13:10:13 bigwoody stunnel: LOG7[13965:3086330784]: 0 session cache timeouts Jan 11 13:10:13 bigwoody stunnel: LOG6[13965:3086330784]: SSL connected: new session negotiated Jan 11 13:10:13 bigwoody stunnel: LOG6[13965:3086330784]: Negotiated ciphers: RC4-MD5 SSLv3 Kx=RSA Au=RSA Enc=RC4 (128) Mac=MD5 Jan 11 13:10:13 bigwoody stunnel: LOG7[13965:3086330784]: SSL socket closed on SSL_read Jan 11 13:10:13 bigwoody stunnel: LOG7[13965:3086330784]: Socket write shutdown Jan 11 13:10:13 bigwoody stunnel: LOG5[13965:3086330784]: Connection closed: 91 bytes sent to SSL, 73 bytes sent to socket Jan 11 13:10:13 bigwoody stunnel: LOG7[13965:3086330784]: telnet finished (0 left) And then, you can see what stunnel is listening on: [root@bigwoody custom_img]# lsof -i | grep stunnel stunnel 13965 apache 4u IPv4 156503478 TCP static-216.114.79.43.primarynetwork.com:http (LISTEN) stunnel 13965 apache 5u IPv4 156503480 TCP static-216.114.79.43.primarynetwork.com:https (LISTEN) stunnel 13965 apache 30u IPv4 156771437 TCP localhost.localdomain:51333->localhost.localdomain:9676 (ESTABLISHED) stunnel 13965 apache 33u IPv4 156846546 TCP *:privatewire (LISTEN) If I start up stunnel from the command line as "root" or another user even, it only listens on the port listed in the conf file. Does anyone have any idea what's going on here? How can I turn off this behavior? Thanks! Alan

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Re: [stunnel-users] your mail
by Brian Hatch 10 Jan '08

10 Jan '08

On or about 2008-01-10 15:34 +0100, khaled45(a)free.fr directed: > Here attached files generated. > can you send me the configuration element of SSL and Stunnel or explain me how > to generate? You sent the private keys too - you shouldn't do this. You should create new keys when done debugging this problem. I saw only 2 keys - the CA and the stunnel.pem. Your configuration specifies 3 keys, the CA, stunnel.pem, and is attempting to verify the SSL client (browser? something else) against the CA via the 'verify=' line. What is the SSL client? Did you generate a key for it? Because your config is requiring the SSL client authenticate itself, and Stunnel is dropping the connection because that phase isn't working correctly. -- Brian Hatch "So, what's the problem?" Systems and "I don't know. Security Engineer *That's* the problem." http://www.ifokr.org/bri/ Every message PGP signed

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Re: [stunnel-users] your mail
by Brian Hatch 09 Jan '08

09 Jan '08

At more or less 2008-01-09 18:09 +0100, khaled45(a)free.fr squalked: > ; It's often easier to use CAfile > CAfile = ca.pem > cert = userkey.pem > debug = 7 > client = no > [apache] > accept = 4433 > connect = 192.168.1.4:433 I'd suggest using the full path for your pem files above, just to be safe. Can you shoot the public keys of the client (which is not on this machine) and the ca.pem and the public key from userkey.pem (which is actually the server's key - you may wish to rename.) There are three pems involved: * the CA key (private) and cert (public) in ca.pem * the stunnel server's key (private) and cert (public) in userkey.pem. ('userkey' is a bad name here.) * the client's key (private) and cert (public) on 192.168.1.5. Can you send the public parts here so I can verify that they're signed by the appropritate folks? -- Brian Hatch "Everybody's cute! Systems and Everybody's cute! Security Engineer Even me. But in http://www.ifokr.org/bri/ purple I'm stunning!" Every message PGP signed

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TCP (Server / Client)
by khaled khaled 09 Jan '08

09 Jan '08

Hi all, I am a new STUNNEL user,I will do 2 secure sockets TCP (Server / Client). I would like to know how to set 'stunnel.conf. I tried but it does not work. Description: ---------- I created a CA root and from this I have created 2 pairs (key and certificate) one for the server and one for the client. You can send me please a config file of the server. Many thanks, Stunnel.config (serveur) ----------------------- cert = server.crt key = serverkey.key CAfile = ca.crt ;[Server] accept = 192.168.1.4:4433 connect = 192.168.1.4:4433 _________________________________________________________________ Votre contact a choisi Hotmail, l'e-mail nouvelle génération. Créez un compte. http://www.windowslive.fr/hotmail/default.asp

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2 secure sockets TCP (Server / Client).
by khaled khaled 07 Jan '08

07 Jan '08

Hi all,I am a new STUNNEL user,I will do 2 secure sockets TCP (Server / Client). I would like to know how to set 'stunnel.conf. I tried but it does not work. Description: ---------- I created a CA root and from this I have created 2 pairs (key and certificate) one for the server and one for the client. You can send me please a config file from a server? Many thanks, Stunnel.config (serveur) ----------------------- ; 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;key = stunnel.pemcert = server.crt key = serverkey.key ; Some performance tuningssocket = l:TCP_NODELAY=1socket = r:TCP_NODELAY=1 CAfile = ca.crt ;[Server]accept = 192.168.1.4:4433connect = 192.168.1.4:4433 KHALED Khaled Ingénieur de télécommunications et informatique _________________________________________________________________ Votre contact a choisi Hotmail, l'e-mail nouvelle génération. Créez un compte. http://www.windowslive.fr/hotmail/default.asp

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Missing Something Basic on Config
by Steve 29 Dec '07

29 Dec '07

Using stunnel for NNTPS. Stunnel starts without any apparent problems (log looks normal), but simply doesn't intercept packets from my news reader. There is no activity in the log and sniffing the packets shows everything happening on 119. My understanding of the concept is that there are no configuration changes needed in the newsreader; IOW, I leave it pointing to the unsecured NNTP server with the port set to 119. I fear I'm missing something very obvious. BTW, I've confirmed the ability to use NNTPS with this particular server by using Outlook Express, which is compatible with NNTPS. Version: 4.20; I used the Windows binary. Running XP. Config: ; Some performance tunings socket = l:TCP_NODELAY=1 socket = r:TCP_NODELAY=1 ; Some debugging stuff useful for troubleshooting debug = 7 output = stunnel.log ; Use it for client mode client = yes ; Service-level configuration [nntps] accept = 192.168.1.101:119 connect = secure.news.easynews.com:563 Log: 2007.12.28 22:24:46 LOG5[6640:6644]: stunnel 4.20 on x86-pc-mingw32-gnu with OpenSSL 0.9.8d 28 Sep 2006 2007.12.28 22:24:46 LOG5[6640:6644]: Threading:WIN32 SSL:ENGINE Sockets:SELECT,IPv6 2007.12.28 22:24:46 LOG5[6640:5936]: No limit detected for the number of clients 2007.12.28 22:24:46 LOG7[6640:5936]: FD 196 in non-blocking mode 2007.12.28 22:24:46 LOG7[6640:5936]: SO_REUSEADDR option set on accept socket 2007.12.28 22:24:46 LOG7[6640:5936]: nntps bound to 192.168.1.101:119

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Avoiding outlook express warning...
by fg 28 Dec '07

28 Dec '07

Hello all I use stunnel on a server with a stunnel.pem file generated with openSSL,( this file is not certified with verisign or others...) Each time i launch outlook express on a client a have a warning saying that the server is using a certificate who can't be verified.... I have to close this warning and after all is ok... Question Is it possible to skip this warning? perhaps with a public key approuved in outlook express??? thanks for help --------------------------------- Ne gardez plus qu'une seule adresse mail ! Copiez vos mails vers Yahoo! Mail

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stunnel
by peter griep 28 Dec '07

28 Dec '07

hello i'm using stunnel with download2day,but it's not working wih grabit can you tell what i must do to work stunnel with grabit. peter

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1 tunnel client to few different servers
by Shalvi Ziv 26 Dec '07

26 Dec '07

All, As my PROXY server gets requests from end-users to be proxied to several different content providers (SMS servers), I was wondering how can encrypt the traffic between the PROXY to the SMS using stunnel, but still handle the differentiation to the various content providers. Meaning, my PROXY listens on port 9090 for all incoming SMS requests and each request should be addressed to different SMS server (i.e. different content provider) based on the number the message was sent to. See following example: Client = yes [SMPP] accept = 9090 (should always be this port) connect = <SMS IP>:442 Now, how can I do it with stunnel configuration (having the <SMS IP> flexibly assigned according to other parameters in the packet)? Thanks! zivs

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Can stunnel be configured to listen for multiple IP addresses and access different email hosts?
by David Goldstein 21 Dec '07

21 Dec '07

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