June 2007 - stunnel-users

stunnel autostart at boot
by Grant Kohler 11 Jun '07

11 Jun '07

Has anybody created a startup script to load stunnel when a machine boots? Thanks, -Grant

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Re: [stunnel-users] [PATCH?] Senting a list of accepted CAs to the client
by Kevin Martin 07 Jun '07

07 Jun '07

Has anyone any information on this? It affects the ability of Thunderbird users (in this case) to use secure communications with IMAP mail servers using TLS/SSL. Please see the bugzillas below. Thanks. Kevin Martin https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=237962 and list posting from 4/2007: Hello, stunnel currently does not send a list of accepted CAs, see e.g. https://bugzilla.mozilla.org/show_bug.cgi?id=327001 Sending the list was #if 0-ed out sometime between stunnel 3.22 and 4.00, with no change log entry AFAICS. Does anyone remember know why was it disabled, and whether it is safe to reenable (e. g. using the attached patch)? Thanks, Mirek <patch snipped>...see the list posting from 4/2007 above for the attached patch.

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regarding CRLpath
by piyush tewari 07 Jun '07

07 Jun '07

Hi, I m using crl but it is woking only in the case of using CRLfile. That is when I use the CRLfile , the client having the revoked certificate is now not able to connect to the server. But when I m providing the CRLpath in the stunnel config file , the client is still able to connect. That is CRL is working in the case of CRLfile entry and not working in the case of CRLpath. The entry that i have specified is CRLpath = C:\Stunnel\debug\revoked So where is the flaw. I know that in case of the CRLfile , it is necessary to restart the stunnel , whenever the CRL changes. But in case of CRLpath , whether it is necessary to restart the stunnel or not. regards piyush --------------------------------- You snooze, you lose. Get messages ASAP with AutoCheck in the all-new Yahoo! Mail Beta.

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Problem with 'verify=3'
by Koenraad Lelong 05 Jun '07

05 Jun '07

Hi, I would like to have a secure access to a Firebird database server. When I configure verify = 2 on the server I can connect, but I would like to have verify = 3 and this does not work. This is my stunnel.conf : client = no foreground = yes setuid = stunnel setgid = nogroup pid = /var/run/stunnel.pid debug = 7 output = /var/log/stunnel.log socket = l:TCP_NODELAY=1 socket = r:TCP_NODELAY=1 verify = 3 CApath = /etc/stunnel/certs/ CAfile = /etc/stunnel/cacert.pem cert = /etc/stunnel/server.pem [firebird] accept = 3052 connect = localhost:gds_db output of stunnel -version : stunnel 4.14 on i686-suse-linux-gnu PTHREAD+POLL+IPv4+LIBWRAP with OpenSSL 0.9.8a 11 Oct 2005 Global options cert = /etc/stunnel/stunnel.pem ciphers = ALL:!ADH:+RC4:@STRENGTH debug = 5 key = /etc/stunnel/stunnel.pem pid = /var/stunnel/stunnel.pid RNDbytes = 64 RNDfile = /dev/urandom RNDoverwrite = yes session = 300 seconds verify = none Service-level options TIMEOUTbusy = 300 seconds TIMEOUTclose = 60 seconds TIMEOUTconnect = 10 seconds TIMEOUTidle = 43200 seconds I'm running OpenSuse 10.1 on the server. This is the log when I can't connect (verify = 3) : 2007.06.05 13:18:55 LOG5[15150:3083052720]: stunnel 4.14 on i686-suse-linux-gnu PTHREAD+POLL+IPv4+LIBWRAP with OpenSSL 0.9.8a 11 Oct 2005 2007.06.05 13:18:55 LOG7[15150:3083052720]: Snagged 64 random bytes from /root/.rnd 2007.06.05 13:18:55 LOG7[15150:3083052720]: Wrote 1024 new random bytes to /root/.rnd 2007.06.05 13:18:55 LOG7[15150:3083052720]: RAND_status claims sufficient entropy for the PRNG 2007.06.05 13:18:55 LOG6[15150:3083052720]: PRNG seeded successfully 2007.06.05 13:18:55 LOG7[15150:3083052720]: Certificate: /etc/stunnel/server.pem 2007.06.05 13:18:55 LOG7[15150:3083052720]: Key file: /etc/stunnel/server.pem 2007.06.05 13:18:55 LOG7[15150:3083052720]: Loaded verify certificates from /etc/stunnel/cacert.pem 2007.06.05 13:18:55 LOG7[15150:3083052720]: Verify directory set to /etc/stunnel/certs/ 2007.06.05 13:18:55 LOG5[15150:3083052720]: Peer certificate location /etc/stunnel/certs/ 2007.06.05 13:18:55 LOG6[15150:3083052720]: file ulimit = 1024 (can be changed with 'ulimit -n') 2007.06.05 13:18:55 LOG6[15150:3083052720]: poll() used - no FD_SETSIZE limit for file descriptors 2007.06.05 13:18:55 LOG5[15150:3083052720]: 500 clients allowed 2007.06.05 13:18:55 LOG7[15150:3083052720]: FD 5 in non-blocking mode 2007.06.05 13:18:55 LOG7[15150:3083052720]: FD 6 in non-blocking mode 2007.06.05 13:18:55 LOG7[15150:3083052720]: FD 7 in non-blocking mode 2007.06.05 13:18:55 LOG7[15150:3083052720]: SO_REUSEADDR option set on accept socket 2007.06.05 13:18:55 LOG7[15150:3083052720]: firebird bound to 0.0.0.0:3052 2007.06.05 13:18:55 LOG7[15150:3083052720]: Created pid file /var/run/stunnel.pid 2007.06.05 13:19:02 LOG7[15150:3083052720]: firebird accepted FD=8 from 192.168.0.13:25651 2007.06.05 13:19:02 LOG7[15150:3083049888]: firebird started 2007.06.05 13:19:02 LOG7[15150:3083049888]: FD 8 in non-blocking mode 2007.06.05 13:19:02 LOG7[15150:3083049888]: TCP_NODELAY option set on local socket 2007.06.05 13:19:02 LOG7[15150:3083049888]: FD 9 in non-blocking mode 2007.06.05 13:19:02 LOG7[15150:3083049888]: FD 11 in non-blocking mode 2007.06.05 13:19:02 LOG7[15150:3083052720]: Cleaning up the signal pipe 2007.06.05 13:19:02 LOG6[15150:3083052720]: Child process 15152 finished with code 0 2007.06.05 13:19:02 LOG7[15150:3083049888]: Connection from 192.168.0.13:25651 permitted by libwrap 2007.06.05 13:19:02 LOG5[15150:3083049888]: firebird connected from 192.168.0.13:25651 2007.06.05 13:19:02 LOG7[15150:3083049888]: SSL state (accept): before/accept initialization 2007.06.05 13:19:02 LOG7[15150:3083049888]: SSL state (accept): SSLv3 read client hello A 2007.06.05 13:19:02 LOG7[15150:3083049888]: SSL state (accept): SSLv3 write server hello A 2007.06.05 13:19:02 LOG7[15150:3083049888]: SSL state (accept): SSLv3 write certificate A 2007.06.05 13:19:02 LOG7[15150:3083049888]: SSL state (accept): SSLv3 write certificate request A 2007.06.05 13:19:02 LOG7[15150:3083049888]: SSL state (accept): SSLv3 flush data 2007.06.05 13:19:02 LOG5[15150:3083049888]: VERIFY OK: depth=1, /C=BE/ST=Vlaams Brabant/L=Diest/O=ACE electronics n.v./OU=IT/CN=Certificate Authority/emailAddress=postmaster.ace-electronics.be 2007.06.05 13:19:02 LOG4[15150:3083049888]: VERIFY ERROR ONLY MY: no cert for /C=BE/ST=Vlaams Brabant/L=Diest/O=ACE electronics n.v./OU=IT/CN=client/emailAddress=postmaster.ace-electronics.be 2007.06.05 13:19:02 LOG7[15150:3083049888]: SSL alert (write): fatal: certificate unknown 2007.06.05 13:19:02 LOG3[15150:3083049888]: SSL_accept: 140890B2: error:140890B2:SSL routines:SSL3_GET_CLIENT_CERTIFICATE:no certificate returned 2007.06.05 13:19:02 LOG7[15150:3083049888]: firebird finished (0 left) 2007.06.05 13:19:04 LOG7[15150:3083052720]: firebird accepted FD=8 from 192.168.0.13:25653 2007.06.05 13:19:04 LOG7[15150:3083049888]: firebird started 2007.06.05 13:19:04 LOG7[15150:3083049888]: FD 8 in non-blocking mode 2007.06.05 13:19:04 LOG7[15150:3083049888]: TCP_NODELAY option set on local socket 2007.06.05 13:19:04 LOG7[15150:3083049888]: FD 9 in non-blocking mode 2007.06.05 13:19:04 LOG7[15150:3083049888]: FD 11 in non-blocking mode 2007.06.05 13:19:04 LOG7[15150:3083052720]: Cleaning up the signal pipe 2007.06.05 13:19:04 LOG6[15150:3083052720]: Child process 15154 finished with code 0 2007.06.05 13:19:04 LOG7[15150:3083049888]: Connection from 192.168.0.13:25653 permitted by libwrap 2007.06.05 13:19:04 LOG5[15150:3083049888]: firebird connected from 192.168.0.13:25653 2007.06.05 13:19:04 LOG7[15150:3083049888]: SSL state (accept): before/accept initialization 2007.06.05 13:19:04 LOG7[15150:3083049888]: SSL state (accept): SSLv3 read client hello A 2007.06.05 13:19:04 LOG7[15150:3083049888]: SSL state (accept): SSLv3 write server hello A 2007.06.05 13:19:04 LOG7[15150:3083049888]: SSL state (accept): SSLv3 write certificate A 2007.06.05 13:19:04 LOG7[15150:3083049888]: SSL state (accept): SSLv3 write certificate request A 2007.06.05 13:19:04 LOG7[15150:3083049888]: SSL state (accept): SSLv3 flush data 2007.06.05 13:19:04 LOG5[15150:3083049888]: VERIFY OK: depth=1, /C=BE/ST=Vlaams Brabant/L=Diest/O=ACE electronics n.v./OU=IT/CN=Certificate Authority/emailAddress=postmaster.ace-electronics.be 2007.06.05 13:19:04 LOG4[15150:3083049888]: VERIFY ERROR ONLY MY: no cert for /C=BE/ST=Vlaams Brabant/L=Diest/O=ACE electronics n.v./OU=IT/CN=client/emailAddress=postmaster.ace-electronics.be 2007.06.05 13:19:04 LOG7[15150:3083049888]: SSL alert (write): fatal: certificate unknown 2007.06.05 13:19:04 LOG3[15150:3083049888]: SSL_accept: 140890B2: error:140890B2:SSL routines:SSL3_GET_CLIENT_CERTIFICATE:no certificate returned 2007.06.05 13:19:04 LOG7[15150:3083049888]: firebird finished (0 left) 2007.06.05 13:19:09 LOG3[15150:3083052720]: Received signal 2; terminating 2007.06.05 13:19:09 LOG7[15150:3083052720]: removing pid file /var/run/stunnel.pid I put the client cert in /etc/stunnel/certs and I ran 'c_rehash /etc/stunnel/certs'. What am I missing ? Thanks for any input. Regards, Koenraad Lelong.

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Problem with verify = 3
by Koenraad Lelong 05 Jun '07

05 Jun '07

Hi, I would like to have a secure access to a Firebird database server. When I configure verify = 2 on the server I can connect, but I would like to have verify = 3 and this does not work. This is my stunnel.conf : client = no foreground = yes setuid = stunnel setgid = nogroup pid = /var/run/stunnel.pid debug = 7 output = /var/log/stunnel.log socket = l:TCP_NODELAY=1 socket = r:TCP_NODELAY=1 verify = 3 CApath = /etc/stunnel/certs/ CAfile = /etc/stunnel/cacert.pem cert = /etc/stunnel/server.pem [firebird] accept = 3052 connect = localhost:gds_db output of stunnel -version : stunnel 4.14 on i686-suse-linux-gnu PTHREAD+POLL+IPv4+LIBWRAP with OpenSSL 0.9.8a 11 Oct 2005 Global options cert = /etc/stunnel/stunnel.pem ciphers = ALL:!ADH:+RC4:@STRENGTH debug = 5 key = /etc/stunnel/stunnel.pem pid = /var/stunnel/stunnel.pid RNDbytes = 64 RNDfile = /dev/urandom RNDoverwrite = yes session = 300 seconds verify = none Service-level options TIMEOUTbusy = 300 seconds TIMEOUTclose = 60 seconds TIMEOUTconnect = 10 seconds TIMEOUTidle = 43200 seconds I'm running OpenSuse 10.1 on the server. This is the log when I can't connect (verify = 3) : 2007.06.05 13:18:55 LOG5[15150:3083052720]: stunnel 4.14 on i686-suse-linux-gnu PTHREAD+POLL+IPv4+LIBWRAP with OpenSSL 0.9.8a 11 Oct 2005 2007.06.05 13:18:55 LOG7[15150:3083052720]: Snagged 64 random bytes from /root/.rnd 2007.06.05 13:18:55 LOG7[15150:3083052720]: Wrote 1024 new random bytes to /root/.rnd 2007.06.05 13:18:55 LOG7[15150:3083052720]: RAND_status claims sufficient entropy for the PRNG 2007.06.05 13:18:55 LOG6[15150:3083052720]: PRNG seeded successfully 2007.06.05 13:18:55 LOG7[15150:3083052720]: Certificate: /etc/stunnel/server.pem 2007.06.05 13:18:55 LOG7[15150:3083052720]: Key file: /etc/stunnel/server.pem 2007.06.05 13:18:55 LOG7[15150:3083052720]: Loaded verify certificates from /etc/stunnel/cacert.pem 2007.06.05 13:18:55 LOG7[15150:3083052720]: Verify directory set to /etc/stunnel/certs/ 2007.06.05 13:18:55 LOG5[15150:3083052720]: Peer certificate location /etc/stunnel/certs/ 2007.06.05 13:18:55 LOG6[15150:3083052720]: file ulimit = 1024 (can be changed with 'ulimit -n') 2007.06.05 13:18:55 LOG6[15150:3083052720]: poll() used - no FD_SETSIZE limit for file descriptors 2007.06.05 13:18:55 LOG5[15150:3083052720]: 500 clients allowed 2007.06.05 13:18:55 LOG7[15150:3083052720]: FD 5 in non-blocking mode 2007.06.05 13:18:55 LOG7[15150:3083052720]: FD 6 in non-blocking mode 2007.06.05 13:18:55 LOG7[15150:3083052720]: FD 7 in non-blocking mode 2007.06.05 13:18:55 LOG7[15150:3083052720]: SO_REUSEADDR option set on accept socket 2007.06.05 13:18:55 LOG7[15150:3083052720]: firebird bound to 0.0.0.0:3052 2007.06.05 13:18:55 LOG7[15150:3083052720]: Created pid file /var/run/stunnel.pid 2007.06.05 13:19:02 LOG7[15150:3083052720]: firebird accepted FD=8 from 192.168.0.13:25651 2007.06.05 13:19:02 LOG7[15150:3083049888]: firebird started 2007.06.05 13:19:02 LOG7[15150:3083049888]: FD 8 in non-blocking mode 2007.06.05 13:19:02 LOG7[15150:3083049888]: TCP_NODELAY option set on local socket 2007.06.05 13:19:02 LOG7[15150:3083049888]: FD 9 in non-blocking mode 2007.06.05 13:19:02 LOG7[15150:3083049888]: FD 11 in non-blocking mode 2007.06.05 13:19:02 LOG7[15150:3083052720]: Cleaning up the signal pipe 2007.06.05 13:19:02 LOG6[15150:3083052720]: Child process 15152 finished with code 0 2007.06.05 13:19:02 LOG7[15150:3083049888]: Connection from 192.168.0.13:25651 permitted by libwrap 2007.06.05 13:19:02 LOG5[15150:3083049888]: firebird connected from 192.168.0.13:25651 2007.06.05 13:19:02 LOG7[15150:3083049888]: SSL state (accept): before/accept initialization 2007.06.05 13:19:02 LOG7[15150:3083049888]: SSL state (accept): SSLv3 read client hello A 2007.06.05 13:19:02 LOG7[15150:3083049888]: SSL state (accept): SSLv3 write server hello A 2007.06.05 13:19:02 LOG7[15150:3083049888]: SSL state (accept): SSLv3 write certificate A 2007.06.05 13:19:02 LOG7[15150:3083049888]: SSL state (accept): SSLv3 write certificate request A 2007.06.05 13:19:02 LOG7[15150:3083049888]: SSL state (accept): SSLv3 flush data 2007.06.05 13:19:02 LOG5[15150:3083049888]: VERIFY OK: depth=1, /C=BE/ST=Vlaams Brabant/L=Diest/O=ACE electronics n.v./OU=IT/CN=Certificate Authority/emailAddress=postmaster.ace-electronics.be 2007.06.05 13:19:02 LOG4[15150:3083049888]: VERIFY ERROR ONLY MY: no cert for /C=BE/ST=Vlaams Brabant/L=Diest/O=ACE electronics n.v./OU=IT/CN=client/emailAddress=postmaster.ace-electronics.be 2007.06.05 13:19:02 LOG7[15150:3083049888]: SSL alert (write): fatal: certificate unknown 2007.06.05 13:19:02 LOG3[15150:3083049888]: SSL_accept: 140890B2: error:140890B2:SSL routines:SSL3_GET_CLIENT_CERTIFICATE:no certificate returned 2007.06.05 13:19:02 LOG7[15150:3083049888]: firebird finished (0 left) 2007.06.05 13:19:04 LOG7[15150:3083052720]: firebird accepted FD=8 from 192.168.0.13:25653 2007.06.05 13:19:04 LOG7[15150:3083049888]: firebird started 2007.06.05 13:19:04 LOG7[15150:3083049888]: FD 8 in non-blocking mode 2007.06.05 13:19:04 LOG7[15150:3083049888]: TCP_NODELAY option set on local socket 2007.06.05 13:19:04 LOG7[15150:3083049888]: FD 9 in non-blocking mode 2007.06.05 13:19:04 LOG7[15150:3083049888]: FD 11 in non-blocking mode 2007.06.05 13:19:04 LOG7[15150:3083052720]: Cleaning up the signal pipe 2007.06.05 13:19:04 LOG6[15150:3083052720]: Child process 15154 finished with code 0 2007.06.05 13:19:04 LOG7[15150:3083049888]: Connection from 192.168.0.13:25653 permitted by libwrap 2007.06.05 13:19:04 LOG5[15150:3083049888]: firebird connected from 192.168.0.13:25653 2007.06.05 13:19:04 LOG7[15150:3083049888]: SSL state (accept): before/accept initialization 2007.06.05 13:19:04 LOG7[15150:3083049888]: SSL state (accept): SSLv3 read client hello A 2007.06.05 13:19:04 LOG7[15150:3083049888]: SSL state (accept): SSLv3 write server hello A 2007.06.05 13:19:04 LOG7[15150:3083049888]: SSL state (accept): SSLv3 write certificate A 2007.06.05 13:19:04 LOG7[15150:3083049888]: SSL state (accept): SSLv3 write certificate request A 2007.06.05 13:19:04 LOG7[15150:3083049888]: SSL state (accept): SSLv3 flush data 2007.06.05 13:19:04 LOG5[15150:3083049888]: VERIFY OK: depth=1, /C=BE/ST=Vlaams Brabant/L=Diest/O=ACE electronics n.v./OU=IT/CN=Certificate Authority/emailAddress=postmaster.ace-electronics.be 2007.06.05 13:19:04 LOG4[15150:3083049888]: VERIFY ERROR ONLY MY: no cert for /C=BE/ST=Vlaams Brabant/L=Diest/O=ACE electronics n.v./OU=IT/CN=client/emailAddress=postmaster.ace-electronics.be 2007.06.05 13:19:04 LOG7[15150:3083049888]: SSL alert (write): fatal: certificate unknown 2007.06.05 13:19:04 LOG3[15150:3083049888]: SSL_accept: 140890B2: error:140890B2:SSL routines:SSL3_GET_CLIENT_CERTIFICATE:no certificate returned 2007.06.05 13:19:04 LOG7[15150:3083049888]: firebird finished (0 left) 2007.06.05 13:19:09 LOG3[15150:3083052720]: Received signal 2; terminating 2007.06.05 13:19:09 LOG7[15150:3083052720]: removing pid file /var/run/stunnel.pid I put the client cert in /etc/stunnel/certs and I ran 'c_rehash /etc/stunnel/certs'. What am I missing ? Thanks for any input. Regards, Koenraad Lelong.

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certificate revocation
by piyush tewari 05 Jun '07

05 Jun '07

Hi , I am using Stunnel to protect one of my server. I am able to configure the stunnel properly with the help of stunnel. Now i am trying to use the revocation list concept in the stunnel. For using the stunnel revocation list i performed the following steps. 1. for generating the CRL file openssl ca -gencrl -keyfile ca_key -cert ca_crt -out my_crl.pem 2. for revoking the certificates openssl ca -revoke bad_crt_file -keyfile ca_key -cert ca_crt The entry specified in the stunnel.conf file is:- CRLfile = my_crl.pem Surprisingly the client is still able to connect to the server. Is it the problem in my configuration or it is a bug of stunnel. Regards, Piyush --------------------------------- Need a vacation? Get great deals to amazing places on Yahoo! Travel.

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plz help me in debugging the code
by piyush tewari 04 Jun '07

04 Jun '07

Hello Friends, I am facing problems in debugging the source code of stunnel. the behaviour of the code is very unexpected for me. the return statement is not returning from the function. (Line 145 of gui.c file). Sameway when i debug line no 1266 of the options.c , that is "name=default_config_file;" , the df pointer gets it's value that means it is executing another line , line no 1305 of options.c itself "df=file_open(name, 0);". I am not getting this working of the stunnel code. And the other problem that i m facing is that during the debugging , many variables are not showing their occupied value. So please help me in understanding this working and resolving it. Thank you.. Regards Piyush --------------------------------- --------------------------------- Pinpoint customers who are looking for what you sell.

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Re: [stunnel-users] stunnel-4.20 server loop on AIX 5.3
by Peter Heimann 04 Jun '07

04 Jun '07

Michal Trojnara <Michal.Trojnara(a)mobi-com.net> wrote on 31.05.2007 20:48:08: > An alternative workaround would be changing: > continue; > to: > sleep(1); > continue; If OpenSSL has been compiled with IBM cc, most new stunnel connections then result in EAGAIN once. sleep(1) seems to prevent an endless loop, but most requests now need at least one second to be processed. Compiling OpenSSL with IBM xlc_r, as you proposed, is definitely the better solution and prevents the EAGAIN errors. -- Regards Peter Heimann _______________________________________________________________ SMS schreiben mit WEB.DE FreeMail - einfach, schnell und kostenguenstig. Jetzt gleich testen! http://f.web.de/?mc=021192

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Re: [stunnel-users] stunnel-4.20 server loop on AIX 5.3
by Peter Heimann 03 Jun '07

03 Jun '07

Michal Trojnara <Michal.Trojnara(a)mobi-com.net> wrote on 31.05.2007 20:48:08: > On Monday 28 May 2007 20:51, Peter Heimann wrote: > > Under heavy usage, stunnel-4.20 on AIX 5.3 enters into a loop with high > > CPU load. > > SSL_accept() returns with error, SSL_get_error() returns 5 > > (SSL_ERROR_SYSCALL). get_last_socket_error() returns EAGAIN, and the loop > > continues without end. Nevertheless, new connection requests still get > > processed. > Could it be the problem described at the end of this page: > https://www.systinet.com/doc/ssc-65/waspc/html/extlibs.install.openssl.html Indeed. Further experiments on AIX 5.3: OpenSSL 0.9.8e configured as "./Configure no-idea threads", compiled with "cc" (IBM XL C Compiler 7.0), stunnel 4.20 --> loop in init_ssl() OpenSSL 0.9.8e configured as "./Configure no-idea threads", compiled with "xlc_r" (IBM XL C Compiler 7.0, thread-safe variant), stunnel 4.20 --> no problem OpenSSL 0.9.8e configured as "./Configure no-idea threads", compiled with "gcc" (GCC version 4.1.1), stunnel 4.20 --> no problem Thanks for the hint. -- Regards Peter Heimann _______________________________________________________________ SMS schreiben mit WEB.DE FreeMail - einfach, schnell und kostenguenstig. Jetzt gleich testen! http://f.web.de/?mc=021192

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