stunnel-users November 2010

18 participants
22 discussions

ssl renegotiation
by Joe Williams 24 Nov '10

24 Nov '10

List, How does one secure stunnel from man in the middle attacks regarding ssl renegotiation. I have seen http://www.openssl.org/docs/ssl/SSL_CTX_set_options.html#SECURE_RENEGOTIATI… but I couldn't tell if stunnel is affected by it, nor what I could do outside of installing a newer version of openssl to prevent it. Additionally I did a scan on www.ssllabs.com and it stated that insecure renegotiation was supported, which isn't good. I am running 0.9.8k-7ubuntu8.4, the standard version that ships with ubuntu 10.04, and stunnel 4.32. What can I do to configure stunnel to protect myself? My current config is below. Thanks. -Joe ; Certificate/key is needed in server mode and optional in client mode cert = /etc/stunnel/file.crt key = /etc/stunnel/file.key foreground = yes debug = 5 ciphers = DES-CBC3-SHA:AES256-SHA:AES128-SHA:RC4-SHA:RC4-MD5 ; Protocol version (all, SSLv2, SSLv3, TLSv1) sslVersion = all options = NO_SSLv2 ; Some security enhancements for UNIX systems - comment them out on Win32 chroot = /var/lib/stunnel4/ setuid = stunnel4 setgid = stunnel4 ; PID is created inside chroot jail pid = /stunnel4.pid ; Some performance tunings socket = l:TCP_NODELAY=1 socket = r:TCP_NODELAY=1 ; Service-level configuration [https] accept = 443 connect = localhost:80 TIMEOUTclose = 0 Name: Joseph A. Williams Email: joe(a)joetify.com Blog: http://www.joeandmotorboat.com/ Twitter: http://twitter.com/williamsjoe

2 2

SSLPassPhraseDialog
by Avinash Gaonkar 23 Nov '10

23 Nov '10

Hi Team, How can we configure ssl key passphrase in stunnel config file. for. eg SSLPassPhraseDialog exec:/path/to/passphrase-file parameter we have in apache, so no need to key in password every time when we restart service. Regards, Avinash Gaonkar

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SMPP Protocol and STunnel
by Pathak, Apurva (Apu) 23 Nov '10

23 Nov '10

Hello, I would like to find out if I can use STunnel as follows: I have a stand alone C# executable program that uses a third party SDK that implements SMPP protocol and sends SMS text messages with wireless carriers. Recently, one of the wireless carriers wants us to implement SSL Client Authentication and wants SMPP messages that are exchanged with them to be encrypted after the client authentication is done. I want to find out if I can use STunnel running so that STunnel can encrypt and decrypt the messages exchanged between my program and the carrier's SMS server. (1) Is this possible with STunnel? (2) What are the steps involved? I am on the Windows Server 2003 platform. I would really appreciate a reply. Thanks, Apu

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Re: [stunnel-users] Error: faulting application stunnel.exe, version 0.0.0.0, faulting module libeay32.dll, version 1.0.0.1, fault address 0x0007331e.
by Pathak, Apurva (Apu) 21 Nov '10

21 Nov '10

Ok...I may keep it....at the moment things are very stable so I am not touching any thing for the moment. The client mentioned it...and they examined the stunnel.conf of some of their other customers...so...otherwise it made sense to me to keep it. Thanks again for your help! Apurva ====== Hi Apurva, Good news. Just to mention: SslVersion=all OFTEN SOLVES MANY PROBLEMS in various circumstances. So I would keep it... Just search for it in the mailing list and you will see... This is just an advice... Yours sincerely, Pierre -----Original Message----- From: stunnel-users-bounces(a)mirt.net [mailto:[email protected]] On Behalf Of stunnel-users-request(a)mirt.net Sent: Sunday, November 21, 2010 1:27 PM To: stunnel-users(a)mirt.net Subject: stunnel-users Digest, Vol 76, Issue 13 Send stunnel-users mailing list submissions to stunnel-users(a)mirt.net To subscribe or unsubscribe via the World Wide Web, visit http://stunnel.mirt.net/mailman/listinfo/stunnel-users or, via email, send a message with subject or body 'help' to stunnel-users-request(a)mirt.net You can reach the person managing the list at stunnel-users-owner(a)mirt.net When replying, please edit your Subject line so it is more specific than "Re: Contents of stunnel-users digest..."

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public domain [PATCH] to stunnel 4.34 for Windows CE / Windows Mobile, "no service" CRITICAL bug and unicode bugs fixed
by Pierre DELAAGE 17 Nov '10

17 Nov '10

Dear All, Please find enclosed a patch in "diff -cr orig patched" format, applying to stunnel4.34 as found here ftp://stunnel.mirt.net/stunnel/. This patch mainly addresses compilation and unicode issues for Windows CE targets + ONE critical issue preventing stunnel to service anything (!). I use MS EVC 4sp2 compiler with WCE 420 SDK, on a vista host platform. Once debugged the code works fine on WM6 HTC smartphones. Should work on WM5. It needs a windows CE openssl lib (I recompiled MY patched version of openssl 1.0.0a successfully: I will have to log a patch to those gentlemen, hoping that they are open to integrate it, something not so obvious in the past). I will later post here a link to my patch for openssl 100a pointing to the openssl mailing list. THIS OPENSSL PATCH IS ESSENTIAL : with my older version of openssl 098pre_j for wce, stunnel does not work anymore (it crashes after first cnx). The present stunnel patch addresses the following issues : ************* I] COMPILATION FAILURES 1/ on common.h "EINVAL redefinition" : in fact the compile options WX (see evc.mak) does not tolerate any warning : The MS evc420 compiler ALWAYS issues a warning on this symbol redefinition. Michal and I are dealing with it since month... But, considering that NEITHER Exxx error codes are used in stunnel, I suggest that in fact ALL these redef should be suppressed. TODO: In the future a proper rewrite of code in log.c, where hardcoded values of WSA error codes are used instead of symbolic constant, will have to be done. 2/ client.c CreateProcess is a UNICODE function: code was ascii only. Code has been adapted to work in unicode. 3/ evc.mak path to new openssl lib has been redefined. proper location for the libs in openssl tree has been set in the make-install block (although this block is presently USELESS and needs a complete rewrite). 4/ gui.c All code using hmainmenu is OFF under winCE. So some new lines involving it were not compiling. 5/ options.c linger_val.l_linger and linger_val.l_onoff require ushort values. Strict type checking of the compiler required a proper cast to ushort of the r-values. stralloc uses "strdup": on Win32 and winCE strdup is _strdup (!). 6/ prototypes.h : _beginthread was defined as returning an int, an a long in sthread.c. After some checking in various documentations, long is the correct type, in particular because _beginthread can return the special error value "-1L". So that unsigned types are illogical. This simplifies the code in some locations, by saving some -now useless- casts. 7/ sthread.c create_client: suppressed some useless cast to (long) for beginthread. ************* II] OPERATIONAL ERRORS (at run-time) This is a reminder of previous notification to the mailing list : due to beginthread improper code and/or use, It is presently IMPOSSIBLE for stunnel 434 to be used in production on WCE: it is just unable to service any...service. Nothing happens if, for example, you use it to connect to an https server. No log either ! I corrected the code with both Michal patch to gui.c and mine to sthread.c: gui.c (Michal patch) : _beginthread was called with 0 as stacksize which, cumulated to an improper coding of sthread/beginthread, led to FAILURE of service thread creation. sthread.c: _beginthread : now supports "0" stacksize value, leading to default linker stack size (1MB by default unless specified differently on the linker command line, something we do not yet perform but could). ************* III] MINOR IMPROVMENT _beginthread: added a log on critical event of "failure" to create a service thread. because I think it is a critical event, isn't it? I hope you will find this patch useful. Thank you for your excellent work, Yours sincerely, Pierre Delaage Note : I use stunnel to establish a simple "vpn" between smartphones and a corporate linux server mainly for HTTPS/POPS/SMTPS support. Stunnel is very relevant in that matter, over solutions based on SSH (although we use also ssh), from a communication cost point of view : ssh establishes permanent socket between client and server, so that the communication is charged by the mobile network provider : and these charges are very expensive. On the contrary stunnel only establishes ssl sockets on demand so that financial charges are limited to strict necessary. Please note that stunnel brings "client based certificate authentication" to POP/SMTP mobile mail user agents which only BASICALLY supports SSL with server authentication, but NO client authentication, such as M$ Outlook for Mobile (unless you pay for an exchange server and exchange client licence). Here again stunnel is very relevant. Note 2 : the strdup and unicode bug fixes should benefit also to the win32 (for PC) stunnel version for PC.

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CApath hash calculation broken (ver 4.34)?
by Konstantin Suvorov 17 Nov '10

17 Nov '10

Hello, I’m trying to setup client-server SSL connection with “level 3” verification on server side. I use 4.34 precompiled binary package for win32. I put client certificates into CApath folder with hashed filenames (I use openssl x509 -hash to get them). And nothing works: I get “bad certificate”. After sniffing for filenames stunnel server is looking for I found out that they are not matching the hash values I got with openssl tool. I downloaded openssl binaries (ver. 0.9.8o) and put them into the stunnel folder. This fixed the bug with wrong filename request inside stunnel, but it started to crash after connection is initiated. I tried to install stunnel (fresh download of 4.34) on another computer – the same problem: requested hash-filename is not equal to actual one. Does anybody know how to fix this? Regards, Konstantin.

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STunnel / Memory Usage / 4 Second Lag
by Jesse Proudman 16 Nov '10

16 Nov '10

We have an account running on STunnel that has been operating just fine for the last 9 days. This morning, all of a sudden, stunnel memory usage spiked to consume the entire available memory on the machine, and response time went from sub 1 second to 4+ seconds. Nothing has changed in the load balanced service itself, the configuration, or any of the traffic numbers. Restarting stunnel gets us between 5 and 60 seconds of normal response times before spiking in memory and going back to 4 seconds. Has any one seen this before? Thanks - Jesse

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Difficulty to compile with alternate 64 bit openssl libraries
by Philippe A. 12 Nov '10

12 Nov '10

Hello, I am having a problem when I compile stunnel against 64 bit openssl libraries: ./configure --prefix $HOME/tls --with-threads=fork --with-ssl=/opt2/openssl stunnel will end up using default libraries in /lib (which I can't remove from my environment). The workaround we have found is to modify the configure script and to force the LIBS variable to use "lib64" instead of "lib". # Add SSL includes and libraries CFLAGS="$CFLAGS -I$ssldir/include" LIBS="$LIBS -L$ssldir/lib64 -lssl -lcrypto" #- <---- Is this a known problem? Is there another way around this without changing the configure script? Thanks!

2 1

Reg:libwrap is not working with stunnel 4.34
by mohan raj 10 Nov '10

10 Nov '10

Hi, I successfully cross compiled the Stunnel version 4.34 with OpenSSL version 1.0.0a for arm-linux.i want to use this stunnel with my own application which will communicate with outer world through LAN or GPRS.currently i am testing stunnel with telnet application.Its working fine.I am able to telnet to arm board through SSL enabled telnet terminal software.Now i want restrict the access.so i used the /etc/hosts/allow and /etc/hosts.deny files with my chrroot directory as "/".but stunnel is not at all cared about libwrap service.its not checking those files.if i give libwrap=yes in stunnel.conf file its says "specified option name is not valid here".i compiled stunnel with the option --enable-libwrap and gave the libwrap lib also through LDFLAGS.here with i attached my stunnel version information file, stunnel .conf file also.i think its due to configuration???still i don`t know what to do???so please guys help me out. Thanks & Regards S.Thiyagarajan.

3 4

Error Reading Certificate File
by Ken Davidson 04 Nov '10

04 Nov '10

Hi, I am trying to update my companies Certificate in STunnel and I'm getting the following error messages: Certificate: pass-web_new.pem Error reading certificate file: pass-web_new.pem error queue: 140DC009 : error:140DC009:SSL routines:SSL_CTX_use_certificate_chain_file:PEM lib error queue: 906700D : error:0906700D:PEM routines:PEM_ASN1_read_bio:ASN1 lib error queue: D08303A : error:0D08303A:asn1 encoding routines:ASN1_TEMPLATE_NOEXP_D2I:nested asn1 error error queue: D07803A : error:0D07803A:asn1 encoding routines:ASN1_ITEM_EX_D2I:nested asn1 error SSL_CTX_use_certificate_chain_file: D0680A8: error:0D0680A8:asn1 encoding routines:ASN1_CHECK_TLEN:wrong tag We are currently using STunnel without issue; but my certificate is due to expire November 15th. I submitted my request via a CSR file created with OPENSSL. I've attempted to put the data into the file pointed at in the stunnel.conf file but this error continues to haunt me. My previous key was 256, but when making this key I created a 1024 key and used that for the CSR file. I've also added the Intermediate certificate information to the file. Any information on what could be the problem is greatly appreciated. Version: 4.34 Thanks, Ken

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stunnel-users November 2010