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3294 discussions

Wrapping interclient connections outbound to many servers
by Matthew Case 02 May '06

02 May '06

Hello all, I have searched high and low for a solution to this problem, but I haven't found anything so I am coming here in hopes someone will be able to help me. I have to wrap the interclient protocol (>1024 to 3060) in some manner of encryption to appease one of my clients. I have already wrapped the ajp13 protocol between the apache server and the tomcat server, but now the tomcat server (which acts as an stunnel server in the ajp13 setup) must also act as a client and wrap all outbound and return traffic to 10 servers to and from port 3060. Making large modifications to the source code is not going to be feasible given my current time crunch (it must be implemented in two weeks). Has anyone run into anything like this and does anyone have any tips? Thanks in advance! - Matt

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Stunnel + Snort + MySQL
by Steven 02 May '06

02 May '06

I have a problem that I have been unsuccessful in solve thus far with Stunnel, Snort, and MySQL. Stunnel (client & server): 4.04 Snort: 2.4.4 on the client MySQL Ver 11.18 Distrib 3.23.58, for redhat-linux-gnu (i386) [not the latest and greatest by any means] I setup stunnel so that traffic destined for localhost 3306 (mysql) on the client goes to port 3307 on the server. Stunnel on the server is setup to take traffic from 3307 and send it to 3306 locally. This connection works fine. I can fire up Snort and have events properly log to my snort database on the server from the client. However, if stunnel is stopped/restarted on either the client or the server Snort is not able to keep writing to the database unless it is restarted. I just get this error: May 2 12:44:03 box snort[44126]: database: Problem inserting a new signature 'Test Snort Signature' May 2 12:44:03 box1 snort[44126]: database: mysql_error: MySQL server has gone away SQL=INSERT INTO event (sid,cid,signature,timestamp) VALUES ('4', '22', '0', '2006-05-02 16:44:03.322') May 2 12:44:03 box snort[44126]: database: mysql_error: MySQL server has gone away SQL=ROLLBACK Whenever I close stunnel it sends traffic to the other end. I can restart it and open up new connections just fine. However, Snort will not even try and connect to port 3306. Once stunnel has been stopped (or even restarted) it just immediately fails to even try and connect to the port. It seems there's some kind of signal sent that kills the connection (and all future connections?). I cannot figure oout why this happens. Any ideas? Thanks Steven

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stunnel broken?
by Smith, Brian C1 (N-ASGARD AVIONICS) 28 Apr '06

28 Apr '06

does anyone know what this error message means and how to fix it? SSL_read (SSL_ERROR_SYSCALL): Operation would block (246) Brian Smith brian.c1.smith(a)lmco.com

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SSL_read (SSL_ERROR_SYSCALL): Operation would block (246)
by Smith, Brian C1 (N-ASGARD AVIONICS) 26 Apr '06

26 Apr '06

Hello all, I am having a problem using stunnel to connect web application in java to a UniData Database server. The setup is working fine, traffic passes over the tunnel from webserver to database without a problem except when a large query is sent over the tunnel. Normal queries get responses no problem. I am running HP-UX 11.00. Stunnel is running in daemon mode on both servers. Any ideas why this might happen? Is there a buffer limit or something for stunnel? Thanks in advance! Here's the stunnel.conf files for them: database side: ------------------------------------------------------ RNDfile=/opt/hpws/apache/stunnel/.stunnel.rnd pid = /opt/hpws/apache/logs/stunnel.pid debug = 7 output = /opt/hpws/apache/logs/stunnel.log client = no foreground = no [unidata] accept = 5555 connect = 127.0.0.1:31438 ------------------------------------------------------ webserver side: ------------------------------------------------------ RNDfile=/opt/hpws/apache/stunnel/.stunnel.rnd pid = /opt/hpws/apache/logs/stunnel.pid debug = 7 output = /opt/hpws/apache/logs/stunnel.log client = yes foreground = no [unidata] accept = 127.0.0.1:5555 connect = dbserver:5555 ------------------------------------------------------ Here is my stunnel -version output: ------------------------------------------------------ stunnel 4.04 on hppa2.0w-hp-hpux11.00 PTHREAD with OpenSSL 0.9.7g 11 Apr 2005 Global options cert = /opt/hpws/apache/stunnel/etc/stunnel/stunnel.pem ciphers = ALL:!ADH:+RC4:@STRENGTH debug = 5 key = /opt/hpws/apache/stunnel/etc/stunnel/stunnel.pem pid = /opt/hpws/apache/stunnel/var/run/stunnel.pid RNDbytes = 64 RNDoverwrite = yes session = 300 seconds verify = none Service-level options TIMEOUTbusy = 300 seconds TIMEOUTclose = 60 seconds TIMEOUTidle = 43200 seconds ------------------------------------------------------ Here is the error from the client: ------------------------------------------------------ 2006.04.26 10:47:11 LOG7[1862:1]: unidata accepted FD=0 from 127.0.0.1:49644 2006.04.26 10:47:11 LOG7[1862:1]: FD 0 in non-blocking mode 2006.04.26 10:47:11 LOG7[1862:8]: unidata started 2006.04.26 10:47:11 LOG5[1862:8]: unidata connected from 127.0.0.1:49644 2006.04.26 10:47:11 LOG7[1862:8]: FD 1 in non-blocking mode 2006.04.26 10:47:11 LOG7[1862:8]: unidata connecting 141.240.76.34:5555 2006.04.26 10:47:11 LOG7[1862:8]: remote connect #1: EINPROGRESS: retrying 2006.04.26 10:47:11 LOG7[1862:8]: waitforsocket: FD=1, DIR=write 2006.04.26 10:47:11 LOG7[1862:8]: waitforsocket: ok 2006.04.26 10:47:11 LOG7[1862:8]: Remote FD=1 initialized 2006.04.26 10:47:11 LOG7[1862:8]: SSL state (connect): before/connect initialization 2006.04.26 10:47:11 LOG7[1862:8]: SSL state (connect): SSLv3 write client hello A 2006.04.26 10:47:11 LOG7[1862:8]: SSL state (connect): SSLv3 read server hello A 2006.04.26 10:47:11 LOG7[1862:8]: SSL state (connect): SSLv3 read server certificate A 2006.04.26 10:47:11 LOG7[1862:8]: SSL state (connect): SSLv3 read server done A 2006.04.26 10:47:11 LOG7[1862:8]: SSL state (connect): SSLv3 write client key exchange A 2006.04.26 10:47:11 LOG7[1862:8]: SSL state (connect): SSLv3 write change cipher spec A 2006.04.26 10:47:11 LOG7[1862:8]: SSL state (connect): SSLv3 write finished A 2006.04.26 10:47:11 LOG7[1862:8]: SSL state (connect): SSLv3 flush data 2006.04.26 10:47:11 LOG7[1862:8]: SSL state (connect): SSLv3 read finished A 2006.04.26 10:47:11 LOG7[1862:8]: 3 items in the session cache 2006.04.26 10:47:11 LOG7[1862:8]: 7 client connects (SSL_connect()) 2006.04.26 10:47:11 LOG7[1862:8]: 7 client connects that finished 2006.04.26 10:47:11 LOG7[1862:8]: 0 client renegotiatations requested 2006.04.26 10:47:11 LOG7[1862:8]: 0 server connects (SSL_accept()) 2006.04.26 10:47:11 LOG7[1862:8]: 0 server connects that finished 2006.04.26 10:47:11 LOG7[1862:8]: 0 server renegotiatiations requested 2006.04.26 10:47:11 LOG7[1862:8]: 4 session cache hits 2006.04.26 10:47:11 LOG7[1862:8]: 0 session cache misses 2006.04.26 10:47:11 LOG7[1862:8]: 0 session cache timeouts 2006.04.26 10:47:11 LOG6[1862:8]: Negotiated ciphers: AES256-SHA SSLv3 Kx=RSA Au=RSA Enc=AES(256) Mac=SHA1 2006.04.26 10:47:12 LOG3[1862:8]: SSL_read (SSL_ERROR_SYSCALL): Operation would block (246) 2006.04.26 10:47:12 LOG5[1862:8]: Connection reset: 744 bytes sent to SSL, 539 bytes sent to socket 2006.04.26 10:47:12 LOG7[1862:8]: unidata finished (0 left) --------------------------------------------------------- Here is the error from the server: --------------------------------------------------------- 2006.04.26 10:48:24 LOG7[18850:1]: unidata accepted FD=0 from 141.240.76.29:49645 2006.04.26 10:48:24 LOG7[18850:1]: FD 0 in non-blocking mode 2006.04.26 10:48:24 LOG7[18850:6]: unidata started 2006.04.26 10:48:24 LOG5[18850:6]: unidata connected from 141.240.76.29:49645 2006.04.26 10:48:24 LOG7[18850:6]: SSL state (accept): before/accept initialization 2006.04.26 10:48:24 LOG7[18850:6]: SSL state (accept): SSLv3 read client hello A 2006.04.26 10:48:24 LOG7[18850:6]: SSL state (accept): SSLv3 write server hello A 2006.04.26 10:48:24 LOG7[18850:6]: SSL state (accept): SSLv3 write certificate A 2006.04.26 10:48:24 LOG7[18850:6]: SSL state (accept): SSLv3 write server done A 2006.04.26 10:48:24 LOG7[18850:6]: SSL state (accept): SSLv3 flush data 2006.04.26 10:48:24 LOG7[18850:6]: SSL state (accept): SSLv3 read client key exchange A 2006.04.26 10:48:24 LOG7[18850:6]: SSL state (accept): SSLv3 read finished A 2006.04.26 10:48:24 LOG7[18850:6]: SSL state (accept): SSLv3 write change cipher spec A 2006.04.26 10:48:24 LOG7[18850:6]: SSL state (accept): SSLv3 write finished A 2006.04.26 10:48:24 LOG7[18850:6]: SSL state (accept): SSLv3 flush data 2006.04.26 10:48:24 LOG7[18850:6]: 1 items in the session cache 2006.04.26 10:48:24 LOG7[18850:6]: 0 client connects (SSL_connect()) 2006.04.26 10:48:24 LOG7[18850:6]: 0 client connects that finished 2006.04.26 10:48:24 LOG7[18850:6]: 0 client renegotiatations requested 2006.04.26 10:48:24 LOG7[18850:6]: 5 server connects (SSL_accept()) 2006.04.26 10:48:24 LOG7[18850:6]: 5 server connects that finished 2006.04.26 10:48:24 LOG7[18850:6]: 0 server renegotiatiations requested 2006.04.26 10:48:24 LOG7[18850:6]: 3 session cache hits 2006.04.26 10:48:24 LOG7[18850:6]: 1 session cache misses 2006.04.26 10:48:24 LOG7[18850:6]: 1 session cache timeouts 2006.04.26 10:48:24 LOG6[18850:6]: Negotiated ciphers: AES256-SHA SSLv3 Kx=RSA Au=RSA Enc=AES(256) Mac=SHA1 2006.04.26 10:48:24 LOG7[18850:6]: FD 1 in non-blocking mode 2006.04.26 10:48:24 LOG7[18850:6]: unidata connecting 127.0.0.1:31438 2006.04.26 10:48:24 LOG7[18850:6]: Remote FD=1 initialized 2006.04.26 10:48:25 LOG3[18850:6]: SSL_read (SSL_ERROR_SYSCALL): Connection reset by peer (232) 2006.04.26 10:48:25 LOG5[18850:6]: Connection reset: 9477 bytes sent to SSL, 744 bytes sent to socket 2006.04.26 10:48:25 LOG7[18850:6]: unidata finished (0 left) ---------------------------------------------------------- Brian Smith brian.c1.smith(a)lmco.com

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NSIS Installer Script
by Ryan O'Horo 25 Apr '06

25 Apr '06

I'm looking to distribute stunnel for Windows in such a manner that stunnel installs with a client certificate already configured. Is the original NSIS installer script available for use? Ryan O'Horo

2 1

New behaviour under 4.15?
by Scott Tuc Ellentuch＠T-B-O-H 24 Apr '06

24 Apr '06

Hi, I just did a portupgrade in FreeBSD from 4.14 to 4.15, and now it seems to be looping the command that I asked it, instead of just doing it once. Has there been an option added I need to tell it to just do once? Thanks, Tuc

3 2

too many file descriptors
by Sligar, Benjamin 22 Apr '06

22 Apr '06

I'm working on upgrading from stunnel 4.04 to the 4.15 to utilize the per port specification of a certificate. On my initial testing, I ran with only a few ports, specified the different certs, and, everything seems to work fine. I'm ran into a problem, though, when trying to use the same config file in regards to the number of configured ports. I have 104 inbound ports setup, and, when it hits the 69th configured port, I get the following message for this, and every port that follows: s_poll_add failed for FD=69: too many file descriptors I checked the code, and, this is what I found: #define MAX_FD 64 I didn't find a relation to any configurable options, so I made a change to this parameter in the code, recompiled, and, I was able to start up all of my listens without error. I just wanted to pass this along, and, if it does tie into a configurable parameter, my apologies for not finding it....if someone knows it, please pass that on. Thanks! **************************************** Benjamin Sligar Senior Development Support Specialist Transaction Network Services, Inc P: 703.453.8324 F: 703.453.8391 AIM: dagdromer88 **************************************** This e-mail message is for the sole use of the intended recipient(s) and may contain confidential and privileged information of Transaction Network Services. Any unauthorized review, use, disclosure or distribution is prohibited. If you are not the intended recipient, please contact the sender by reply e-mail and destroy all copies of the original message.

2 1

Stunnel with TPM engine !!!
by dinesh.kallath＠bt.com 19 Apr '06

19 Apr '06

Hello I am new to Stunnel and would like to know how to integrate the engine with Stunnel 4.15. I am trying to integrate a Trusted Platform Module (TPM) engine which is compatible with OpenSSL to use with Stunnel so that the private key for SSL connection can be retrieved and stored in the hardware. I was able to configure the Stunnel config file to use the engine and it is loading the engine fine. The problem I am facing now is the key which stunnel tries to load can be loaded only by the engine, I mean it has to be loaded into the TPM to use it and stunnel tried to load it in the normal way. Please find the debug output bellow, # ./stunnel stunnel-engine.conf 2006.04.19 13:39:22 LOG7[1261:3086812864]: Enabling support for engine 'tpm' DEBUG e_tpm_err.c:295 ERR_load_TPM_strings DEBUG e_tpm_err.c:298 TPM_lib_error_code is 136 2006.04.19 13:39:22 LOG7[1261:3086812864]: Initializing engine DEBUG e_tpm.c:336 tpm_engine_init LOG_DEBUG TSPI ../tcsd_api/clntside.c:58 Sending TSP packet to host localhost. LOG_DEBUG TSPI ../tcsd_api/clntside.c:74 Connecting to 127.0.0.1 LOG_DEBUG TSPI ../tcsd_api/tcstp.c:390 TCS_OpenContext_RPC_TP: Received TCS Context: 0xa0ef791d 2006.04.19 13:39:22 LOG7[1261:3086812864]: Engine initialized 2006.04.19 13:39:22 LOG7[1261:3086812864]: Engine closed 2006.04.19 13:39:22 LOG7[1261:3086812864]: Snagged 64 random bytes from /root/.rnd DEBUG e_tpm.c:1151 tpm_rand_bytes getting 1024 bytes LOG_DEBUG TSPI ../tcsd_api/tcstp.c:2488 TCSP_GetRandom_TP: TCS Context: 0xa0ef791d 2006.04.19 13:39:23 LOG7[1261:3086812864]: Wrote 1024 new random bytes to /root/.rnd DEBUG e_tpm.c:1171 tpm_rand_status 2006.04.19 13:39:23 LOG7[1261:3086812864]: RAND_status claims sufficient entropy for the PRNG 2006.04.19 13:39:23 LOG6[1261:3086812864]: PRNG seeded successfully DEBUG e_tpm.c:736 tpm_rsa_init 2006.04.19 13:39:23 LOG7[1261:3086812864]: Certificate: /root/dk/CVS/070406/applications/openssl_tpm_engine/TpmKey.crt 2006.04.19 13:39:23 LOG7[1261:3086812864]: Key file: /root/dk/CVS/070406/applications/openssl_tpm_engine/TpmKey.key 2006.04.19 13:39:23 LOG3[1261:3086812864]: error stack: 140B3009 : error:140B3009:SSL routines:SSL_CTX_use_RSAPrivateKey_file:PEM lib 2006.04.19 13:39:23 LOG3[1261:3086812864]: SSL_CTX_use_RSAPrivateKey_file: 906D06C: error:0906D06C:PEM routines:PEM_read_bio:no start line It is obvious from the debug that the Stunnel expect a private key file in PEM format but the whole issue is that the private key I have (created using TPM) is not in a PEM format, it is an encrypted file with root key used to encrypt stays inside the TPM hardware. I suppose we need to provide a key load function which loads the key into the TPM rather than using Stunnel. It will be a great help if someone could provide me with some pointers on how to solve this, or please let me know if I am missing out something. Also do ask me if you need any further clarifications. Many thanks, Dinesh Kallath, CISSP Research Professional, Security Research Centre BT Group Chief Technology Office ___________________________ Tel : +44 (0) 1473 643476 Fax : +44 (0) 1473 646886 Mob: +44 (0) 7952144553 Email: dinesh.kallath(a)bt.com Post : PP:2A, B28, Adastral Park, Ipswich IP5 3RE. British Telecommunications plc Registered office: 81 Newgate Street London EC1A 7AJ Registered in England no. 1800000 This electronic message contains information from British Telecommunications plc which may be privileged or confidential. The information is intended to be for the use of the individual(s) or entity named above. If you are not the intended recipient be aware that any disclosure, copying, distribution or use of the contents of this information is prohibited. If you have received this electronic message in error, please notify us by telephone or email (to the numbers or address above) immediately. Activity and use of the British Telecommunications plc email system is monitored to secure its effective operation and for other lawful business purposes. Communications using this system will also be monitored and may be recorded to secure effective operation and for other lawful business purposes.

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stunnel-4.15 doesn't work on Mac OS X 10.4.6
by SUENAGA Hiroki 18 Apr '06

18 Apr '06

Dear all, I found a problem that the stunnel-4.15 doesn't work on the Mac OS X 10.4.6. I think this is a BUG. My environment is: - OS: Mac OS X 10.4.6/Intel - Compiler: gcc 4.0.1 (from XCode 2.2) - OpenSSL: 0.9.7i (Mac OS X original version) - Usage: connect to the submission port. The detail of BUG is the following: In protocol.c::smtp_client() line 138, fdputline() called with argument line = "EHLO localhost." This is a string literal. 130 static void smtp_client(CLI *c) { ... 138 fdputline(c, c->remote_fd.fd, "EHLO localhost"); ... In network.c::fdputline() line 565, the literal is passed to 1st argument of safeconcat(). 556 void fdputline(CLI *c, int fd, char *line) { .... 565 safeconcat(line, crlf); ... In common.h line 311, safeconcat() is #define'ed as: 311 #define safeconcat(dst, src) \ 312 (dst[STRLEN-1]='\0', strncat((dst), (src), \ STRLEN-strlen(dst)-1)) This means the macro safeconcat() write to string literal. This is the BUG. In Mac OS X envoronment, string literal is NOT writable. So protection fault occurs at this code. On the other environment, this breaks somewhere in the heap or in the stack. This may also cause a crash. In stunnel-4.14, fdprintf() is used instead of fdputline(). fdprint() have own writable buffers on stack, and the string literal is copied to the stack. This works fine. The work around is using own writable buffers in fdputline() like fdprint() in stunnel-4.14. But it seems to be a performance tuning why fdputline() is used. So I don't know what is the correct way to fix this BUG.... I hope this BUG is fixed in the future release. If this was already reported, please ignore this mail. Thank you. Rgards, ---------- Internet Initiative Japan Inc. Research & Development Section, Product Development Division, SEIL Business Unit SUENAGA Hiroki <hsuenaga(a)iij.ad.jp>

2 2

STunnel and the MAC
by Bryan Bearden 15 Apr '06

15 Apr '06

I am working on setting up a mac server and having trouble getting the stunnel to work on the mac. I installed Darwin Ports and am running it under there. It appears to be running and my stunnel.conf file appears to be correct, but I cannot get it to use stunnel. Any ideas? I'm trying to connect to MySQL 4. thanks... Bryan

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