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Help: Remote desktop connection crashes Stunnel
by Jonathan Bell 04 Oct '05

04 Oct '05

In an attempt to get remote desktop set up over SSL tunneling with compression, I have installed stunnel on my Windows XP Professional SP2 machine and created a "portable" stunnel/config/dll zip that just contains the essentials to create a pre-configured tunnel. Here are the two config files: Server -------------------------------- ; Sample stunnel configuration file by Michal Trojnara 2002-2005 ; 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.pem ; Some performance tunings socket = l:TCP_NODELAY=1 socket = r:TCP_NODELAY=1 compression = zlib ; Some debugging stuff useful for troubleshooting debug = 6 output = G:\Stunnel Logs\stunnel.log taskbar = no ; Use it for client mode client = no ; Service-level configuration [remote-desktop] accept = 9833 connect = 127.0.0.1:3389 --------------------------------- Client --------------------------------- ; Sample stunnel configuration file by Michal Trojnara 2002-2005 ; Some options used here may not be adequate for your particular configuration ; Some performance tunings socket = l:TCP_NODELAY=1 socket = r:TCP_NODELAY=1 compression = zlib ; Some debugging stuff useful for troubleshooting debug = 7 output = stunnel.log taskbar = yes ; Use it for client mode client = yes ; Service-level configuration [remote-desktop] accept = 127.0.0.1:6389 connect = my.host.name:9833 ---------------------------------- The procedure I used was as follows - start Stunnel on the host, run upstairs with the zipped "portable" stunnel on a USB drive, run stunnel on the other PC, also running XP Pro SP2. Start->run->mstsc, enter 127.0.0.1:6389 and all that happens is that stunnel instantly crashes then Remote Desktop times out. What am I doing wrong?

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Dual Instance of Stunnel Service on W2K
by Mundy Jennifer 04 Oct '05

04 Oct '05

Am new to stunnel and in need of some help. I have W2K box that has Stunnel installed as a service. Upon startup, it starts the service and uses the default stunnel.conf file. I would like to install a second Stunnel service and call a custom .conf service. Is this possible? I've read thru the documentation but haven't come across anything about a second service. We're running v4.05. I know I can get a second instance running via cmd line/batch file, but need the second instance to startup automatically so it can be monitored as well as other things. Thank you in advance. Jennifer The information contained in this e-mail may be confidential and is intended solely for the use of the named addressee. Access, copying or re-use of the e-mail or any information contained therein by any other person is not authorized. If you are not the intended recipient please notify us immediately by returning the e-mail to the originator.(17b)

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SSL_GET_NEW_SESSION:ssl session id callback failed
by DoJo 04 Oct '05

04 Oct '05

Hi There, We have run into "SSL_GET_NEW_SESSION:ssl session id callback failed" error. Can anyone describe what it means? I didn't find any information about it. We'd like to use stunnel to secure Oracle SQL*Net communication. HP-UX server communicates with Win32 clients. We use stunnel standalone not from inetd. Any help would be appreciated. Thanks DoJo Here is a cut from the log file (level 7): 2005.09.29 11:49:53 LOG5[10388:1]: stunnel 4.09 on hppa2.0w-hp-hpux11.11 PTHREAD+POLL+IPv4+LIBWRAP with OpenSSL 0.9.7e 25 Oct 2004 2005.09.29 11:49:53 LOG7[10388:1]: Snagged 0 random bytes from EGD Socket /var/run/egd-pool 2005.09.29 11:49:53 LOG6[10388:1]: PRNG seeded successfully 2005.09.29 11:49:53 LOG7[10388:1]: Certificate: /opt/iexpress/stunnel/etc/stunnel/..._cert.cer 2005.09.29 11:49:53 LOG7[10388:1]: Key file: /opt/iexpress/stunnel/etc/stunnel/..._privkey.pem 2005.09.29 11:49:53 LOG6[10388:1]: file ulimit = 60 (can be changed with 'ulimit -n') 2005.09.29 11:49:53 LOG6[10388:1]: poll() used - no FD_SETSIZE limit for file descriptors 2005.09.29 11:49:53 LOG5[10388:1]: 27 clients allowed 2005.09.29 11:49:53 LOG7[10388:1]: FD 4 in non-blocking mode 2005.09.29 11:49:53 LOG7[10388:1]: FD 5 in non-blocking mode 2005.09.29 11:49:53 LOG7[10388:1]: FD 6 in non-blocking mode 2005.09.29 11:49:53 LOG7[10388:1]: SO_REUSEADDR option set on accept socket 2005.09.29 11:49:53 LOG7[10388:1]: myapp bound to 0.0.0.0:2000 2005.09.29 11:49:53 LOG7[10389:1]: Created pid file /stunnel.pid 2005.09.30 12:01:47 LOG7[10389:1]: myapp accepted FD=1 from 10.3.125.165:3570 2005.09.30 12:01:47 LOG7[10389:1]: FD 1 in non-blocking mode 2005.09.30 12:01:47 LOG7[10389:2]: myapp started 2005.09.30 12:01:47 LOG5[10389:2]: myapp connected from 10.3.125.165:3570 2005.09.30 12:01:47 LOG7[10389:2]: SSL state (accept): before/accept initialization 2005.09.30 12:01:47 LOG3[10389:2]: SSL_accept: 140B544E: error:140B544E:SSL routines:SSL_GET_NEW_SESSION:ssl session id callback failed 2005.09.30 12:01:47 LOG7[10389:2]: myapp finished (0 left) Our config file: cert = /opt/iexpress/stunnel/etc/stunnel/..._cert.cer # contains the server's signed (by a CA) cert. key = /opt/iexpress/stunnel/etc/stunnel/..._privkey.pem # contains the server's private key service = myapp-ssl chroot = /var/run/stunnel pid = /stunnel.pid setuid = oracle setgid = oracle debug = 7 output = stunnel.log client = no [myapp] accept=2000 connect=1521

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stunnel4 user + permissions
by nick.hoffman＠altcall.com 04 Oct '05

04 Oct '05

Hey guys, I've been using stunnel for a while and it's great. I've noticed something that doesn't make much sense to me though, so I was wondering if you might be able to shed some light. Stunnel runs as user:group stunnel4:stunnel4. The server reads client certs (for verify = 3) from /etc/stunnel/certs/ which is chown'd root:ssl-certs and chmod'd 750. The client PEMs in that directory have the same ownership and permissions. User stunnel4 is in the ssl-certs group. When a client connects, the server is unable to read from /etc/stunnel/certs/. If I change the ownership of the directory to root:stunnel4 though, everything works. Any idea why this occurs? Cheers, Nick

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Win2k, stunnel & Magic Mail Monitor questions
by Dana Rasmussen 04 Oct '05

04 Oct '05

Hello, I am running Windows 2000. I have recently learned of the stunnel tool. I am using it with Magic Mail Monitor, (MMM). MMM is a POP3 new mail notifier program. MMM allows me to configure a POP3 server by user name, host, password and POP3 port. MMM allows me to have multiple POP3 servers configured. Unfortunately, MMM does not use SSL. I have been able to get MMM to work with stunnel with the following stunnel.conf file: client = yes [MyPOP3SSL] accept=995 connect=mypop3server.com:995 The associated MMM configuration is: user: myuser host: 127.0.0.1 password:mypassword port:995 I would like to be able to add a second POP3 server to MMM, i.e. Gmail. If I add the following to the bottom of the existing stunnel.conf file Gmail POP3SSL access fails. If I add the following to the top of the existing stunnel.conf file the MyPOP3SSL fails but Gmail works. [GmailPOP3SSL] accept=995 connect=pop.gmail.com:995 The additional MMM configuration is: user:mygmail host: 127.0.0.1 password:mygmailpassword port:995 Is there a way to map the MMM configurations to the matching entries in the stunnel.conf file? Thank you, Dana

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Peer suddenly disconnected
by Mark Tabash 03 Oct '05

03 Oct '05

Hello, I'm having problems using stunnel. I would be glad to provide further information upon request. The funny thing is that it was working before I shipped the client pc to the remote location. Nothing has changed since. Here's what I get in the logs: CLIENT: ssmtp accepted FD=8 from 127.0.0.1:32844 FD 8 in non-blocking mode ssmtp started ssmtp connected from 127.0.0.1:32844 FD 9 in non-blocking mode ssmtp connecting 62.21.201.224:465 remote connect #1: EINPROGRESS: retrying waitforsocket: FD=9, DIR=write waitforsocket: ok Remote FD=9 initialized SSL state (connect): before/connect initialization SSL state (connect): SSLv3 write client hello A waitforsocket: FD=9, DIR=read waitforsocket: ok SSL state (connect): SSLv3 read server hello A SSL state (connect): SSLv3 read server certificate A SSL state (connect): SSLv3 read server certificate request A SSL state (connect): SSLv3 read server done A SSL state (connect): SSLv3 write client certificate A SSL state (connect): SSLv3 write client key exchange A SSL state (connect): SSLv3 write certificate verify A SSL state (connect): SSLv3 write change cipher spec A SSL state (connect): SSLv3 write finished A SSL state (connect): SSLv3 flush data waitforsocket: FD=9, DIR=read waitforsocket: ok SSL_connect: Peer suddenly disconnected ssmtp finished (0 left) SERVER: ssmtp accepted FD=8 from 77.34.26.143:32845 FD 8 in non-blocking mode ssmtp started ssmtp connected from 77.34.26.143:32845 SSL state (accept): before/accept initialization SSL state (accept): SSLv3 read client hello A SSL state (accept): SSLv3 write server hello A SSL state (accept): SSLv3 write certificate A SSL state (accept): SSLv3 write certificate request A SSL state (accept): SSLv3 flush data SSL_accept: Peer suddenly disconnected ssmtp finished (0 left) ============================================ CLIENT INFO: stunnel 4.05 on i386-pc-linux-gnu PTHREAD+LIBWRAP with OpenSSL 0.9.7e 25 Oct 2004 Global options cert = /etc/stunnel/stunnel.pem ciphers = ALL:!ADH:+RC4:@STRENGTH debug = 5 key = /etc/stunnel/stunnel.pem pid = /var/run/stunnel4/stunnel.pid RNDbytes = 64 RNDfile = /dev/urandom RNDoverwrite = yes session = 300 seconds verify = none Service-level options TIMEOUTbusy = 300 seconds TIMEOUTclose = 60 seconds TIMEOUTidle = 43200 seconds ------------------ SERVER INFO: stunnel 4.09 on x86_64-pc-linux-gnu PTHREAD+POLL+IPv6+LIBWRAP with OpenSSL 0.9.7e 25 Oct 2004 Global options cert = /etc/stunnel/stunnel.pem ciphers = ALL:!ADH:+RC4:@STRENGTH debug = 5 key = /etc/stunnel/stunnel.pem pid = /var/lib/run/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

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Stunnel 4.12 released
by Michal Trojnara 30 Sep '05

30 Sep '05

Here is the ChangeLog entry: Version 4.12, 2005.09.29, urgency: MEDIUM: * New features - Win32 installer added. - New Win32 commandline options: -start and -stop. - Log level and thread number are reported to syslog. - DLLs for OpenSSL 0.9.8. - stunnel.spec updated by neeo <neeo(a)irc.pl>. * Bugfixes - Use of broken poll() is disabled on Mac OS X. - Yet another transfer() infinite loop condition fixed. - Workaround for a serious M$ bug (KB177346). - IPv6 DLLs allocation problem resulting in GPF on W2K fixed. - zlib added to shared libraries (OpenSSL may need it). - size_t printf() fixed in stack_info(). * Release notes - This is a bugfix release. Upgrade is recommended. Homepage: http://stunnel.mirt.net/ Download: ftp://stunnel.mirt.net/stunnel/ sha1sum: 3a0f1b9955f64dcab376b4145663f1eadc5dfba5 stunnel-4.12.tar.gz Best regards, Mike

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Stunnel Win32 binary
by Michal Trojnara 30 Sep '05

30 Sep '05

Dear Users, Some people were asking me for a standalone stunnel.exe file. It's located in stunnel-4.12/src directory of stunnel-4.12.tar.gz archive. Winzip can handle .tar.gz format, so you'll be able to unpack it. http://www.winzip.com/wzdifs.htm BTW: I recommend to try the installer, anyway. It's designed to make the upgrade much easier. You can simply enter the path where your current stunnel.exe and stunnel.conf are located during the install. stunnel.conf and stunnel.pem files won't be replaced and your Windows will remember the path so you won't have to enter it on next upgrade. Also the latest OpenSSL DLLs are installed in stunnel directory each time. Notes: 1. Uninstall removes stunnel.conf, so don't uninstall if you're only going to upgrade stunnel. 2. Remember to stop stunnel before you uninstall/upgrade it. Best regards, Mike

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No encryption?
by Revelancefound＠aol.com 27 Sep '05

27 Sep '05

Dear patient users, It seems that stunnel does not encrypt outward traffic from my pc. I was able to get stunnel to work in the first place by having different proxies for each protocol. However, to test if my 8196 bit + x509 certificate keys actually encrypted my traffic I decided to do a test. I had sniffed my own computer using Cain and Able while logging in to my home router. To my disappointment, the sniffer picked up my username and password in plain text through HTTP protocol several times. Either that or Able can crack 256bit level encryption (256 x 32 = 8196) rather quickly. My stunnel.conf file: ; Sample stunnel configuration file by Michal Trojnara 2002-2005 ; Some options used here may not be adequate for your particular configuration ; Certificate/key is needed in server mode and optional in client mode cert = C:\Program Files\stunnel\stunnel.pem key = C:\Program Files\stunnel\stunnel.pem ; Some performance tunings socket = l:TCP_NODELAY=1 socket = r:TCP_NODELAY=1 ; Workaround for Eudora bug options = DONT_INSERT_EMPTY_FRAGMENTS ; Authentication stuff ;verify = 2 ; Don't forget to c_rehash CApath; CApath is located inside chroot jail: ;CApath = certs ; It's often easier to use CAfile: ;CAfile = certs.pem ; Don't forget to c_rehash CRLpath; CRLpath is located inside chroot jail: ;CRLpath = crls ; Alternatively you can use CRLfile: ;CRLfile = crls.pem ; Some debugging stuff useful for troubleshooting ;debug = 7 ;dutput = C:\Program Files\stunnel\stunnel.log ; Use it for client mode client = yes ; Service-level configuration client = yes verify = 0 ;[pop3s] ;accept = 995 ;connect = 110 ;[imaps] ;accept = 993 ;connect = 143 [ssmtp] accept = 127.0.0.1:465 connect = httpsupportingproxy4:3124 TIMEOUTclose = 0 [http] accept = 127.0.0.1:444 connect = httpsupportingproxy3:6588 TIMEOUTclose = 0 [https] accept = 127.0.0.1:443 connect = httpsupportingproxy2:6588 TIMEOUTclose = 0 [ftps] accept = 127.0.0.1:21 connect = httpsupportingproxy1:6588 TIMEOUTclose = 0 ; vim:ft=dosini And my bat file used to generate keys: openssl req -new -x509 -days 365 -nodes -config C:\OpenSSL\bin\openssl.cnf -out stunnel.pem -keyout stunnel.pem ;requirements: ;OpensSSL.exe in C:\windows directory ;Installation of Win32OpenSSL-v0.9.8.mis to C:\ ;Edit C:\OpenSSL\bin\openssl.cnf strings ;[ req ] ;default_bits = 8196 ;default_keyfile = stunnel.pem ;distinguished_name = req_distinguished_name ;attributes = req_attributes ;x509_extensions = v3_ca # The extentions to add to the self signed cert Cain Log: ================================================================== = Cain's MAC Scanner/Promiscuous-mode Detector = ================================================================== IP Address: (Router) MAC Address: (RouterMAC) OUI Fingerprint: Cisco-Linksys, LLC Hostname: ARP Test (Broadcast 31-bit): * ARP Test (Broadcast 16-bit): * ARP Test (Broadcast 8-bit): * ARP Test (Group bit): * ARP Test (Multicast group 0): * ARP Test (Multicast group 1): * ARP Test (Multicast group 3): * Am I doing something wrong here?

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question about usage of configfile
by Revelancefound＠aol.com 26 Sep '05

26 Sep '05

To put it blatantly, I am trying to make stunnel 4.12 create a 2 way encrypted channel from my home computer as a client to an SSL supporting proxy (HTTP). Also, I am using localhost (127.0.0.1) as a connect address for proxy settings in such programs as Internet Explorer or a download manager. A sample of my stunnel.conf is bellow: client = yes verify = 0 [https] accept = 127.0.0.1:8080 connect = ssl.supporting.httpproxy.with.openport:80 TIMEOUTclose = 0 ; vim:ft=dosini My computer currently has the following installed: stunnel-4.12 Opensslv0.9.8 (Win32OpenSSL-v0.9.8.exe) ActivePerl-5.8.7.813-MSWin32-x86-148120.msi Windows XP Home Edition (SP2) Whenever I try to connect to 127.0.0.1:8080 the stunnel log reports 2005.09.23 20:57:33 LOG5[6012:5668]: stunnel 4.12 on x86-pc-mingw32-gnu WIN32+IPv6 with OpenSSL 0.9.8 05 Jul 2005 2005.09.23 20:57:33 LOG5[6012:4600]: No limit detected for the number of clients 2005.09.23 20:57:38 LOG5[6012:1560]: https connected from 127.0.0.1:3226 2005.09.23 20:59:10 LOG5[6012:5396]: https connected from 127.0.0.1:3232 2005.09.23 21:04:10 LOG5[6012:4576]: https connected from 127.0.0.1:3249 2005.09.23 21:09:10 LOG5[6012:4652]: https connected from 127.0.0.1:3268 2005.09.23 21:14:10 LOG5[6012:5396]: https connected from 127.0.0.1:3283 2005.09.23 21:19:12 LOG5[6012:1556]: https connected from 127.0.0.1:3296 2005.09.23 21:24:13 LOG5[6012:4072]: https connected from 127.0.0.1:3309 2005.09.23 21:29:23 LOG3[6012:3408]: Failed to initialize remote connection 2005.09.23 21:29:23 LOG5[6012:6140]: https connected from 127.0.0.1:3332 And so on into infinity Am I trying to do the impossible, or are all those 8196 bit RSA keys (certified through x508) that I generated going to waste?

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