- stunnel-users - stunnel.org

stunnel going to BigIP ssl
by Jones Scott - sjones 13 Sep '06

13 Sep '06

Has anyone used stunnel to end at a BipIP to decode the ssl traffic? If so, any issues or concerns? Thanks *************************************************************************** The information contained in this communication is confidential, is intended only for the use of the recipient named above, and may be legally privileged. If the reader of this message is not the intended recipient, you are hereby notified that any dissemination, distribution or copying of this communication is strictly prohibited. If you have received this communication in error, please resend this communication to the sender and delete the original message or any copy of it from your computer system. Thank You. ****************************************************************************

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"SSL_read returned WANT_READ: retrying" at 30Hz
by Vincent Lascaux 12 Sep '06

12 Sep '06

Hi, I'm trying to use rsync (2.6.8) through STunnel (4.16) to synchronize two PC over the internet (they both have the same version of stunnel and rsync). On the server, I have STunnel running with this configuration: cert = stunnel.pem ; Some performance tunings socket = l:TCP_NODELAY=0 socket = r:TCP_NODELAY=0 ; Some debugging stuff useful for troubleshooting debug = 7 output = stunnel.log [rsync] accept = 273 connect = 873 On the client I have this configuration: cert = stunnel.pem ; Some performance tunings socket = l:TCP_NODELAY=0 socket = r:TCP_NODELAY=0 ; Some debugging stuff useful for troubleshooting debug = 7 output = stunnel.log client = yes [rsync] accept = 873 connect = UrlOfMyServer:273 Then I connect with rsync using rsync -a -h --progress --stats --partial Account@localhost::RemotePath LocalPath I think the connection is not really stable. RSync sometimes hang. The log file on the client side show 2006.09.11 21:33:11 LOG7[2008:1468]: SSL_read returned WANT_READ: retrying at 30Hz (that's right, it means 30 times a second). My log file nearly gets bigger faster than my downloaded file ;) Is it expected? What does this line mean? I turned TCP_NODELAY to 0 thinking that it my give me synchronous sockets and that it would remove that error, but it didn't... Any help appreciated, Thanks -- Vincent

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Stunnel 4.17 released
by Michal Trojnara 10 Sep '06

10 Sep '06

This is a bugfix release. Upgrade is recommended. Version 4.17, 2006.09.10, urgency: MEDIUM: * New features - Win32 DLLs for OpenSSL 0.9.8c. * Bugfixes - Problem with detecting getaddrinfo() in ./configure fixed. - Compilation problem due to misplaced #endif in ssl.c fixed. - Duplicate 220 in smtp_server() function in protocol.c fixed. - Minor os2.mak update. - Minor update of safestring()/safename() macros. sha1sum for stunnel-4.17.tar.gz file: 7a0ea800935e798bf938756000b57d002a99c280 Homepage and download: http://stunnel.mirt.net/ Best regards, Mike

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Multiple HTTPS endpoints
by Andrew Culross 07 Sep '06

07 Sep '06

Can I use stunnel to connect mutiple https endpoints? I'm wondering if a config file like the below would work: [https] accept = 9876 connect = xxx.xxx.xxx.xxx:443 [https] accept = 9875 connect =yyy.yyy.yyy.yyy:443 Thanks in advance ! Andrew Culross TwoFour Systems (914) 220-8849 www.TwoFour.Com The views and opinions expressed in this e-mail message are the sender's own and do not necessarily represent the views and opinions of {TwoFour Systems, LLC or F-O-R Software, LLC}

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Re: [stunnel-users] RFC 2487 test in smtp_server not reliable
by Hans Werner Strube 07 Sep '06

07 Sep '06

Hans Werner Strube wrote: > Michal Trojnara wrote: ... > > I'm going to do it the hard way and add another parameter to > > s_poll_wait() function. > > > > IMHO the timeout should be between 100ms and 500ms. What do you think? > > I have not tested the minimum required. However, it should be as short > as possible, since for a client using TLS, the full delay will always > occur on starting a connection. ... I have now done some measurements using snoop on a Solaris Ultra 2 SMTP server (100 MBit/s) with a Windows XP SP2 client (AMD Duron 1 GHz, 56 kBit/s phone-line modem, SeaMonkey 1.04 mail sender [equivalent to Thunderbird 1.5.x]). The delays between the end of initial connection handshake and the first nonzero data packet for six connections were usually between 10 and 100 ms but once reached 150 ms. Thus, 200 ms may be a reasonable value (although the sample is too small to rule out rare failures).

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windows load levels
by Alex Turner 05 Sep '06

05 Sep '06

Guys, Bit of a newbie question here - but very import to me at least. We are looking to secure a web server that does no currently support SSL. One reason for this is that we want to be able to run the server on multiple hosts and doing so means sharing the sessions etc :-( So - I am interested if anyone has tested the stuffing out of stunnel on windows. IE seeing how well it could handle several hundred sockets simultaneously. Not only from a resource point of view, but from a scaling (n, n**2 etc) point of view. Any input at all will be very welcome. Soon I will be starting some test of my own using JMeter to load test. If anyone is interested in the results I will be happy to post. Cheers AJ Alexander J Turner Ph.D. HYPERLINK "http://www.deployview.com"www.deployview.com HYPERLINK "http://www.nerds-central.blogspot.com"www.nerds-central.blogspot.com HYPERLINK "http://www.project-network.com"www.project-network.com -- No virus found in this outgoing message. Checked by AVG Free Edition. Version: 7.1.405 / Virus Database: 268.11.7/437 - Release Date: 04/09/2006

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Stunnel and CryptoApi
by Marco Aldegheri 05 Sep '06

05 Sep '06

Hello list! Someone knows if there is any way to integrate a Windows stunnel in client mode with the Windows Certificate Store? As OpenVPN does with the cryptoapicert parameter in my opinion it would be very useful because: 1. the private key would not just reside in a pem file but could be set not exportable. 2. the private key could be saved on a smartcard. I found a japaneese wstunnel project that seems to do it but I couldn't find any document about it in english and the gui is only in japaneese. Any hints? Thank you, Marco Aldegheri __________________________________________________ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com

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Real address of client
by Gonzalo Diethelm 03 Sep '06

03 Sep '06

Hello, linux: Linux asus-gonzo 2.6.15-26-686 #1 SMP PREEMPT Thu Aug 3 03:13:28 UTC 2006 i686 GNU/Linux stunnel: stunnel 4.14 on i486-pc-linux-gnu PTHREAD+POLL+IPv6+LIBWRAP with OpenSSL 0.9.8a 11 Oct 2005 apache: Apache/2.0.55 I am using stunnel in Ubuntu to provide https serving to an http-only Apache installation. The stunnel config is: cert = /home/gonzo/src/bg/run/SSL/server.crt key = /home/gonzo/src/bg/run/SSL/server.crt chroot = /var/run/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 = no [https] accept = 443 connect = 80 TIMEOUTclose = 0 Everything works perfectly, except for one minor detail: on the server, my PHP scripts do not have access to the real IP address of the client, and they always see this value as 127.0.0.1. I am aware the manual says that, if you use -l or -L, there will be an additional REMOTE_HOST environment variable with the desired IP address, but I am not sure how to make this work from a setup like mine, where the http server process is already running. Any help or hints are greatly appreciated. Best regards, -- Gonzalo Diethelm gonzalo.diethelm(a)aditiva.com

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4.16 compilation fails for openssl without engine
by Hans Werner Strube 01 Sep '06

01 Sep '06

When openssl was compiled without engine support, compilation of src/ssl.c in stunnel-4.16 fails because of a misplaced #endif. Patch: --- src/ssl.c.ORI Thu Jun 29 23:12:03 2006 +++ src/ssl.c Fri Sep 1 11:30:25 2006 @@ -286,8 +286,6 @@ s_log(LOG_DEBUG, "Engine %d initialized", current_engine+1); } -#endif - ENGINE *get_engine(int i) { if(i<1 || i>current_engine) return NULL; @@ -294,4 +292,6 @@ return engines[i-1]; } +#endif + /* End of ssl.c */

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Duplicate 220 in protocol.c, smtp_server
by Hans Werner Strube 01 Sep '06

01 Sep '06

At least since stunnel 4.15 - but not yet in 4.09 (don't know about the intermediate versions) - there is a (cosmetic only?) bug in the "welcome" forwarding of the smtp_server in protocol.c (lines 177-187 in 4.16): fdgetline(c, c->remote_fd.fd, line); if(!isprefix(line, "220")) { s_log(LOG_ERR, "Unknown server welcome"); longjmp(c->err, 1); } fdprintf(c, c->local_wfd.fd, "220%s + stunnel", line); fdgetline(c, c->local_rfd.fd, line); if(!isprefix(line, "EHLO ")) { s_log(LOG_ERR, "Unknown client EHLO"); longjmp(c->err, 1); } Although the line read from remote_fd.fd already starts with "220", another 220 is prepended in forwarding to local_wfd.fd, line 182. This seems to haveno adverse effects, but this line should better be changed to: fdprintf(c, c->local_wfd.fd, "%s + stunnel", line);

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stunnel 4.16 released
by Michal Trojnara 01 Sep '06

01 Sep '06

A new version of stunnel has been released. Version 4.16, 2006.08.31, urgency: MEDIUM: * New features sponsored by Hewlett-Packard - A new global option to control engine: engineCtrl = <command>[:<parameter>] - A new service-level option to select engine to read private key: engineNum = <engine number> - OCSP support: ocsp = <URL> * New features - A new option to select version of SSL protocol: sslVersion = all|SSLv2|SSLv3|TLSv1 - Visual Studio vc.mak by David Gillingham <dgillingham(a)gmail.com>. - OS2 support by Paul Smedley (http://smedley.info) * Bugfixes - An ordinary user can install stunnel again. - Compilation problem with --enable-dh fixed. - Some minor compilation warnings fixed. - Service-level CRL cert store implemented. - GPF on protocol negotiations fixed. - Problem detecting addrinfo() on Tru64 fixed. - Default group is now detected by configure script. - Check for maximum number of defined services added. - OpenSSL_add_all_algorithms() added to SSL initialization. - configure script sections reordered to detect pthread library funcions. - RFC 2487 autodetection improved (thx to Hans Werner Strube). High resolution s_poll_wait() not currently supported by UCONTEXT threading. - More precise description of cert directory file names (thx to Muhammad Muquit). * Other changes - Maximum number of services increased from 64 to 256 when poll() is used. Homepage: http://stunnel.mirt.net/ Download: ftp://stunnel.mirt.net/stunnel/ sha1 hash for stunnel-4.16.tar.gz file: 6772e0c7f26c2596564ba66978597db8cd229a72 Best regards, Mike

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Windows simultaneous sockets
by Alex 26 Aug '06

26 Aug '06

Guys, Bit of a newbie question here - but very import to me at least. We are looking to secure a web server that does no currently support SSL. One reason for this is that we want to be able to run the server on multiple hosts and doing so means sharing the sessions etc :-( So - I am interested if anyone has tested the stuffing out of stunnel on windows. IE seeing how well it could handle several hundred sockets simultaneously. Not only from a resource point of view, but from a scaling (n, n**2 etc) point of view. Any input at all will be very welcome. Soon I will be starting some test of my own using JMeter to load test. If anyone is interested in the results I will be happy to post. Cheers AJ -- www.deployview.com www.nerds-central.com www.project-network.com

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stunnel and AJP
by Jones Scott - sjones 25 Aug '06

25 Aug '06

Has anyone used stunnel to secure AJP traffic from apache to jboss *************************************************************************** The information contained in this communication is confidential, is intended only for the use of the recipient named above, and may be legally privileged. If the reader of this message is not the intended recipient, you are hereby notified that any dissemination, distribution or copying of this communication is strictly prohibited. If you have received this communication in error, please resend this communication to the sender and delete the original message or any copy of it from your computer system. Thank You. ****************************************************************************

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stunnel 4-15 through proxy server
by Ingvar Tjøstheim 25 Aug '06

25 Aug '06

Hello I am on a network at work behind a firewall and a proxy server. I can connect to my friends linux computer with putty using proxy configuration and port 443. My friend set up his SSH server on port 443, of course. Yesterday, back home, I installed the following on my Windows2000 computer: Win32OpenSSL-v0.9.8b stunnel ver 4-14 FreeProxy version 3.92 This is the stunnel config file for my home computer: client=no verify=0 [wow] accept = 443 connect = 127.0.0.1:3456 TIMEOUTclose = 0 I set up my router to forward port 443 to this computer. I also registered a DynDNS domain and set up a client to update it. Then, still at home, I prepared another computer which I brought to work today. I installed the following on an XP machine: Win32OpenSSL-v0.9.8b stunnel ver 4-14 (which I upgraded to 4.15 today) SockScap_sc32r238 I set up SockScap to connect to 127.0.0.1 on port 2345 and used it to tunnel a program to the internet through my LAN and this Win2K computer. This was working fine when I was at home. My network at home has no proxy server, and I changed stunnel on my XP computer once at work to version 4-15. Then I added the two protocol lines in the config file as you see below. This is the config file on my XP computer at work: verify = 0 client = yes [wow] accept = 2345 protocol = connect protocolHost = www-proxy.DOMAINNAME.no:80 connect = MYDOMAINNAME.dnsalias.com:443 TIMEOUTclose = 0 Now, the funny thing is that it doesn't work. I used to have a SSH server on my computer at home (which is not running now), and I could connect to it from work. I know the setup could work if I just did things right. I know the FreeProxy and SockScap stuff works, cause it did at home. stunnel and the network is the only difference. Still I get these messages on the XP machine running stunnel as client at work when the SockScap program connects to it: 2006.08.25 10:02:29 LOG5[1280:2940]: stunnel 4.15 on x86-pc-mingw32-gnu with OpenSSL 0.9.7i 14 Oct 2005 2006.08.25 10:02:29 LOG5[1280:2940]: Threading:WIN32 SSL:ENGINE Sockets:SELECT,IPv6 2006.08.25 10:02:29 LOG5[1280:2156]: No limit detected for the number of clients 2006.08.25 10:02:59 LOG5[1280:664]: wow connected from 127.0.0.1:3723 2006.08.25 10:03:05 LOG5[1280:972]: wow connected from 127.0.0.1:3725 2006.08.25 10:03:09 LOG5[1280:664]: Connection reset: 0 bytes sent to SSL, 0 bytes sent to socket 2006.08.25 10:03:15 LOG5[1280:972]: Connection reset: 0 bytes sent to SSL, 0 bytes sent to socket ...and it doesn't work. The program I try using through the tunnel never manages to connect. Anyone have a clue? Thank you very much!

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Re: [stunnel-users] safestring and safename insecure
by Hans Werner Strube 24 Aug '06

24 Aug '06

Michal Trojnara wrote: > Assuming on some systems isprint(x) != isprint(x&0xff): any idea how to > exploit this "insecure" code? > > BTW: At least on Linux and Mac OS X isprint() returns 0 in both cases. The same holds for Solaris. I did not actually encounter an error but just got the idea that something may be insecure here by looking at the lines. After all, isprint etc. are often table-based macros without range-checking the argument. And "man isprint" clearly says that the character is unsigned: (Solaris:) The macro isascii() is defined on all integer values; the rest are defined only where the argument is an int, the value of which is representable as an unsigned char, or EOF, (Linux:) These functions check whether c, which must have the value of an unsigned char or EOF, falls into a certain character class according to the current locale.

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safestring and safename insecure
by Hans Werner Strube 24 Aug '06

24 Aug '06

The macros safestring and safename in common.h are insecure if called for a character with high bit set, because (int)*p will sign-extend the byte on machines where char is signed. Possible patch (here for safestring; for safename correspondingly with isprint -> isalnum): do {char *p; for(p=(s); *p; p++) if(!isprint((int)*(unsigned char *)p)) *p='.';} while(0)

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Re: [stunnel-users] accept is not allowed in inetd mode
by Tomasz Feliksiak 24 Aug '06

24 Aug '06

> I'm afraid I won't be able to tell you what's wrong with your > /etc/stunnel/smtps.conf without your /etc/stunnel/smtps.conf file. > 8-) > I guess you didn't define any service section. > > BTW. Please make sure to read the fine manual. There's also a Polish > version. > http://stunnel.mirt.net/static/stunnel.pl.html > > Greetings from Poland, > Mike You were right. I only define ports but dont uncomment protocol names in [] (like [pop3s]). [pop3s] accept = 995 connect = 110 ;[imaps] ;accept = 993 ;connect = 143 [ssmtp] accept = 465 connect = 25 Now it looks like this and it's working (earlier i have two configs, one per service). Poor thing about this is that it don't log anything before you dont uncomment this [] :P - hope no one other make this mistake. When I uncomment everything else was simple cause I have log :) and know what's going on. There was a problem with binding to ports cause I try to run it by inetd but I find your post at google to not run it by inetd. I change stunnel-inetd-4.15-1 to stunnel-standalone-4.15-1 (PLD Rulez :P) and problems gone. Is possible to run stunnel by inetd??? Thanks for help Michal. Stunnel is great :) Ps. I read the manual, english version. Sad thing is that I dont find out where I make mistake and when I read Polish wersion I do. Good thing is that it will be help for others who make this simple mistake. -- Pozdrawiam Tomasz Feliksiak vonom(a)intertel.net.pl

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Stunnel Crash: Gmail SMTP over TLS
by Shatadal Ghosh 23 Aug '06

23 Aug '06

Hi, I am using stunnel 4.15 on Windows XP SP1 with Mozilla Thunderbird as the e-mail client. I do not have openSSL installed locally. I do have the libssl32.dll and libeay32.dll in the same directory as stunnel.exe (C:\Program Files\stunnel). I am running stunnel as a service. Stunnel crashes when I use it to send e-mail (SMTP via TLS) via gmail. According to the e-mail client configuration page on the gmail website http://mail.google.com/support/bin/answer.py?answer=13287&topic=1555 I tried to use SMTP over TLS to connect to smtp.gmail.com:587 My gmail-smtps block in stunnel.conf was ; SMTP service, listens on localhost:250 [gmail-smtps] protocol=smtp accept=localhost:250 connect=smtp.gmail.com:587 On trying to send an e-mail message via the above configuration stunnel crashed. The log file is as follows 2006.06.14 03:17:15 LOG5[3956:3512]: stunnel 4.15 on x86-pc-mingw32-gnu with OpenSSL 0.9.7i 14 Oct 2005 2006.06.14 03:17:15 LOG5[3956:3512]: Threading:WIN32 SSL:ENGINE Sockets:SELECT,IPv6 2006.06.14 03:17:15 LOG5[3956:3600]: No limit detected for the number of clients 2006.06.14 03:17:15 LOG7[3956:3600]: FD 172 in non-blocking mode 2006.06.14 03:17:15 LOG7[3956:3600]: SO_REUSEADDR option set on accept socket 2006.06.14 03:17:15 LOG7[3956:3600]: gmail-pop3s bound to 127.0.0.1:1100 2006.06.14 03:17:15 LOG7[3956:3600]: FD 180 in non-blocking mode 2006.06.14 03:17:15 LOG7[3956:3600]: SO_REUSEADDR option set on accept socket 2006.06.14 03:17:15 LOG7[3956:3600]: gmail-smtps bound to 127.0.0.1:250 ....# info about other mail connections 2006.06.14 03:17:26 LOG7[3956:3600]: gmail-smtps accepted FD=236 from 127.0.0.1:3665 2006.06.14 03:17:26 LOG7[3956:3600]: Creating a new thread 2006.06.14 03:17:26 LOG7[3956:3600]: New thread created 2006.06.14 03:17:26 LOG7[3956:2812]: gmail-smtps started 2006.06.14 03:17:26 LOG7[3956:2812]: FD 236 in non-blocking mode 2006.06.14 03:17:26 LOG7[3956:2812]: TCP_NODELAY option set on local socket 2006.06.14 03:17:26 LOG5[3956:2812]: gmail-smtps connected from 127.0.0.1:3665 2006.06.14 03:17:26 LOG7[3956:2812]: FD 268 in non-blocking mode 2006.06.14 03:17:26 LOG7[3956:2812]: gmail-smtps connecting 64.233.167.111:587 2006.06.14 03:17:26 LOG7[3956:2812]: connect_wait: waiting 10 seconds 2006.06.14 03:17:26 LOG7[3956:2812]: connect_wait: connected 2006.06.14 03:17:26 LOG7[3956:2812]: Remote FD=268 initialized 2006.06.14 03:17:26 LOG7[3956:2812]: TCP_NODELAY option set on remote socket 2006.06.14 03:17:26 LOG5[3956:2812]: Negotiations for smtp (client side) started 2006.06.14 03:17:26 LOG7[3956:2812]: <- 220 mx.gmail.com ESMTP w66sm450524pyw 2006.06.14 03:17:26 LOG7[3956:2812]: -> 220 mx.gmail.com ESMTP w66sm450524pyw <logfile ends> What mistake am I making? Fortunately it seems that gmail supports SMTP over SSL too (smtp.gmail.com:465) and I am using that. However I am also facing this problem with another account which unfortunately allows SMTP only over TLS. Thanks, Shatadal. --- avast! Antivirus: Outbound message clean. Virus Database (VPS): 0624-1, 06/13/2006 Tested on: 6/14/2006 6:22:04 AM avast! - copyright (c) 2000-2006 ALWIL Software. http://www.avast.com _________________________________________________________________ Is your PC infected? Get a FREE online computer virus scan from McAfee® Security. http://clinic.mcafee.com/clinic/ibuy/campaign.asp?cid=3963

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Re: [stunnel-users] RFC 2487 test in smtp_server not reliable
by Hans Werner Strube 23 Aug '06

23 Aug '06

Michal Trojnara wrote: > On 2006-08-22, at 10:55, Hans Werner Strube wrote: > > Instead of waiting, a better method would > > be to have a finer timeout resolution than 1 sec in > > s_poll_wait(...,...); > > setting the timeout to 1 (sec) would be too embarrassing for TLS > > connections. But this would require major changes in the sources. > > I'm going to do it the hard way and add another parameter to > s_poll_wait() function. > > IMHO the timeout should be between 100ms and 500ms. What do you think? I have not tested the minimum required. However, it should be as short as possible, since for a client using TLS, the full delay will always occur on starting a connection. It should be documented somewhere how this new constant could be configured in compilation.

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RFC 2487 test in smtp_server not reliable
by Hans Werner Strube 23 Aug '06

23 Aug '06

In protocol.c, function smtp_server(), a test for plain SSL or STARTTLS usage (RFC 2487) is based on the availability of data from the client (c->local_rfd.fd). This works well in fast LANs but often fails for WAN connections through slow V90 modems. Especially with new Mozilla-based clients (also KMail and Evolution reported by other users) under Windows XP SP2 the test for data fails almost always, incorrectly resulting in an RFC 2487 handshake with error "Unknown client EHLO". This depends to some extent on the client: Outlook Express mostly works, Mozilla 1.7.x often worked after initial failure, SeaMonkey 1.x always fails. This seems to be a timing problem. I tried inserting a "usleep(50000);" before the switch(s_poll_wait(...)), which made SSL work with SeaMonkey (but often not for the first mail-sending attempt). Unfortunately, in Solaris 7 (where I tested stunnel), usleep is not yet thread-safe, maybe nanosleep(...,...) is preferable. Instead of waiting, a better method would be to have a finer timeout resolution than 1 sec in s_poll_wait(...,...); setting the timeout to 1 (sec) would be too embarrassing for TLS connections. But this would require major changes in the sources.

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accept is not allowed in inetd mode
by vonom 23 Aug '06

23 Aug '06

Hello When i try to run stunnel by scripts or by hand stunnel /etc/stunnel/stunnel.conf (or other config) i see something like that: -bash-3.1# stunnel /etc/stunnel/pop3s.conf 2006.08.23 01:45:17 LOG7[24189:3083933376]: RAND_status claims sufficient entropy for the PRNG 2006.08.23 01:45:17 LOG6[24189:3083933376]: PRNG seeded successfully 2006.08.23 01:45:17 LOG7[24189:3083933376]: Certificate: /etc/stunnel/host-cert.pem 2006.08.23 01:45:17 LOG7[24189:3083933376]: Key file: /etc/stunnel/host-key.pem 2006.08.23 01:45:17 LOG7[24189:3083933376]: SSL context initialized for service stunnel file /etc/stunnel/pop3s.conf line 64: accept is not allowed in inetd mode No stunnel sesion, open ports or anything. I was very happy when I find out that I have stunnel-inetd-4.15-1 in my disto and it runs and ports are open. Everything great but when i try to send or receive email (postfix) it dont work. I spend a lot of time and a while ago i write telnet localhost 465 (or 995), ehlo hostname and see: -bash-3.1# telnet localhost 465 Trying 127.0.0.1.465... Connected to localhost. Escape character is '^]'. 2006.08.23 01:56:20 LOG7[24343:3083708096]: RAND_status claims sufficient entropy for the PRNG 2006.08.23 01:56:20 LOG6[24343:3083708096]: PRNG seeded successfully 2006.08.23 01:56:20 LOG7[24343:3083708096]: Certificate: /etc/stunnel/host-cert.pem 2006.08.23 01:56:20 LOG7[24343:3083708096]: Key file: /etc/stunnel/host-key.pem 2006.08.23 01:56:20 LOG7[24343:3083708096]: SSL context initialized for service stunnel file /etc/stunnel/smtps.conf line 64: accept is not allowed in inetd mode Connection closed by foreign host. When I write telnet localhost 25 -bash-3.1# telnet localhost 25 Trying 127.0.0.1.25... Connected to localhost. Escape character is '^]'. 250-PIPELINING 250-SIZE 10240000 250-VRFY 250-ETRN 250-STARTTLS 250 8BITMIME So It's OK I think. file /etc/stunnel/smtps.conf line 64: accept is not allowed in inetd mode Connection closed by foreign host. -line 64 point just last line of config file. I have no idea what it could be. Anyone know how to fix that?

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Protocol using Connect
by Hutchison, Alan 21 Aug '06

21 Aug '06

I am trying to use the protocol entries in the config file as shown below (xyz substituted to protect employer & vendor). Below is the log. Stunnel abends as it is trying to authenticate to our corporate proxy. The network guys are seeing the attempt to authenticate but it does not appear to complete. Any thoughts? key=maxstpb.crt debug=7 output=stunnel.log client=yes [MarketAxess] accept=127.0.0.1:12345 delay=yes TIMEOUTbusy=120 TIMEOUTconnect=120 connect=xyz.xyz.com:80 protocol=connect protocolHost=xyz.xyz.com:443 protocolCredentials=xyz:xyz 2006.08.21 15:13:24 LOG5[2520:1312]: stunnel 4.15 on x86-pc-mingw32-gnu with OpenSSL 0.9.7i 14 Oct 2005 2006.08.21 15:13:24 LOG5[2520:1312]: Threading:WIN32 SSL:ENGINE Sockets:SELECT,IPv4 2006.08.21 15:13:24 LOG5[2520:3184]: No limit detected for the number of clients 2006.08.21 15:13:24 LOG7[2520:3184]: FD 192 in non-blocking mode 2006.08.21 15:13:24 LOG7[2520:3184]: SO_REUSEADDR option set on accept socket 2006.08.21 15:13:24 LOG7[2520:3184]: MarketAxess bound to 127.0.0.1:12345 2006.08.21 15:14:00 LOG7[2520:3184]: MarketAxess accepted FD=200 from 127.0.0.1:4200 2006.08.21 15:14:00 LOG7[2520:3184]: Creating a new thread 2006.08.21 15:14:00 LOG7[2520:3184]: New thread created 2006.08.21 15:14:00 LOG7[2520:2560]: MarketAxess started 2006.08.21 15:14:00 LOG7[2520:2560]: FD 200 in non-blocking mode 2006.08.21 15:14:00 LOG5[2520:2560]: MarketAxess connected from 127.0.0.1:4200 2006.08.21 15:14:00 LOG7[2520:2560]: FD 416 in non-blocking mode 2006.08.21 15:14:00 LOG7[2520:2560]: MarketAxess connecting xyz.xyz.xyz.xyz:80 2006.08.21 15:14:00 LOG7[2520:2560]: connect_wait: waiting 120 seconds 2006.08.21 15:14:00 LOG7[2520:2560]: connect_wait: connected 2006.08.21 15:14:00 LOG7[2520:2560]: Remote FD=416 initialized 2006.08.21 15:14:00 LOG5[2520:2560]: Negotiations for connect (client side) started 2006.08.21 15:14:00 LOG7[2520:2560]: -> CONNECT xyz.xyz.com:443 HTTP/1.1 Alan R. Hutchison 515-362-1272 -----Message Disclaimer----- This e-mail message is intended only for the use of the individual or entity to which it is addressed, and may contain information that is privileged, confidential and exempt from disclosure under applicable law. If you are not the intended recipient, any dissemination, distribution or copying of this communication is strictly prohibited. If you have received this communication in error, please notify us immediately by reply email to Connect(a)principal.com and delete or destroy all copies of the original message and attachments thereto. Email sent to or from the Principal Financial Group or any of its member companies may be retained as required by law or regulation. Nothing in this message is intended to constitute an Electronic signature for purposes of the Uniform Electronic Transactions Act (UETA) or the Electronic Signatures in Global and National Commerce Act ("E-Sign") unless a specific statement to the contrary is included in this message. While this communication may be used to promote or market a transaction or an idea that is discussed in the publication, it is intended to provide general information about the subject matter covered and is provided with the understanding that The Principal is not rendering legal, accounting, or tax advice. It is not a marketed opinion and may not be used to avoid penalties under the Internal Revenue Code. You should consult with appropriate counsel or other advisors on all matters pertaining to legal, tax, or accounting obligations and requirements.

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limit connections per certificate
by Eric H. Jung 14 Aug '06

14 Aug '06

Hi, I'd like to limit the number of connections to stunnel (in server mode) by client certificate. In other words, I want all clients to only have 1 open socket connection to the server at a time. Is this possible with stunnel out-of-the-box, or must I write a patch to handle it? Thank you, grimholtz

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stunnel through xinetd: process not terminating after use
by Alex Forrow 07 Aug '06

07 Aug '06

Hi, Im using stunnel through xinetd to forward some local unencrypted ldap connections to our ssl ldap server. Seems to work ok but after each use the stunnel process does not terminate, so I end up with losts of processes not doing anything. After a few days, these processes reach a limit and connections fail. As you can see, the connection has finished, but the process still exists: [root@lynx stunnel]# ps -e | grep stunnel 2396 ? 00:00:00 stunnel 2517 ? 00:00:00 stunnel 2575 ? 00:00:00 stunnel 2576 ? 00:00:00 stunnel [root@lynx stunnel]# netstat -p | grep stunnel tcp 0 0 lynx.seekit.co.uk:ldaplo lynx.seekit.co.uk:60390 CLOSE_WAIT 2396/stunnel unix 2 [ ] DGRAM 3204569 2576/stunnel unix 2 [ ] DGRAM 3204562 2575/stunnel unix 2 [ ] DGRAM 3203127 2517/stunnel unix 2 [ ] DGRAM 3202108 2396/stunnel Heres the xinetd configuration for stunnel (/etc/xinetd.d/ldaplo): # default: on # description: Stunnel to connect to LDAP for an insecure local session service ldaplo { disable = no #flags = REUSE port = 390 socket_type = stream wait = no user = nobody server = /usr/sbin/stunnel server_args = /etc/stunnel/ldap.conf # log_on_failure += USERID } Heres the stunnel configuration file (/etc/stunnel/ldap.conf): client = yes connect = 636 Cheers, Alex Forrow

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Stunnel without certificates
by Shane 04 Aug '06

04 Aug '06

Hi, I am new to this group and also to Stunnel utility. I would like to use Stunnel to secure my http connections. Here is a twist. I just want to encrypt the link and don't bother much about the authentication. 1. Can I use Stunnel without certificates? 2. If certificate is mandatory, can I use only the file which contains "keys" but not use other authentication credentials? 3. Can I use anonymous DH Ciphers so that authentication phase is assumed done and both client and servers generate the keys? Any help and guidance will useful. Thanks, -Ravi Joshi __________________________________________________ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com

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