stunnel-users

2 participants
3307 discussions

stunnel with pop-3 over SSL, port 995?
by conover＠rahul.net 27 Apr '05

27 Apr '05

Can stunnel be used to connect to a pop-3 over SSL server on port 995? Thanks, John -- John Conover, conover(a)rahul.net, http://www.johncon.com/

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SIGSEGV in init_ssl stunnel 4.10 on solaris 8
by Toni Schmidbauer 27 Apr '05

27 Apr '05

hi, we've got the following problem: - compiled stunnel 4.10 with openssl-0.9.7g - stunnel receives a SIGSEGV when connecting i am really not a C or gdb guru, but running stunnel 4.10 under gdb shows this: # gdb src/stunnel GNU gdb 6.0 Copyright 2003 Free Software Foundation, Inc. GDB is free software, covered by the GNU General Public License, and you are welcome to change it and/or distribute copies of it under certain conditions. Type "show copying" to see the conditions. There is absolutely no warranty for GDB. Type "show warranty" for details. This GDB was configured as "sparc-sun-solaris2.8"... (gdb) set args /usr/local/stunnel-4.10/etc/stunnel/stunnel.conf (gdb) run Starting program: /usr/local/src/stunnel-4.10/src/stunnel /usr/local/stunnel-4.10/etc/stunnel/stunnel.conf [New LWP 1] [New LWP 2] [New LWP 3] [New LWP 4] Program received signal SIGSEGV, Segmentation fault. 0x0002a32c in init_ssl (c=0x11e008) at client.c:298 298 s_poll_add(&c->fds, c->ssl_rfd->fd, (gdb) bt #0 0x0002a32c in init_ssl (c=0x11e008) at client.c:298 #1 0x00029f30 in do_client (c=0x11e008) at client.c:147 #2 0x00029dd8 in client (arg=0x126270) at client.c:120 (gdb) p c->ssl_rfd $1 = (FD *) 0x1 (gdb) so it seems c->ssl_rfd points to nowhere. further investigation reveals that c->ssl_rfd gets overwritten after the call to SSL_accept. stunnel 4.09 works. is this a problem with UCONTEXT? ************************************************************************ information as request on the support page: openssl version: OpenSSL 0.9.7g 11 Apr 2005 uname -a: SunOS coti 5.8 Generic_117350-05 sun4u sparc SUNW,UltraAX-i2 gcc -v: Reading specs from /usr/local/lib/gcc-lib/sparc-sun-solaris2.8/3.3.2/specs Configured with: ../configure --with-as=/usr/ccs/bin/as --with-ld=/usr/ccs/bin/ld --disable-nls --disable-libgcj --enable-languages=c,c++ Thread model: posix gcc version 3.3.2 stunnel log with debug=7: 2005.04.27 08:41:33 LOG5[24386:1]: stunnel 4.10 on sparc-sun-solaris2.8 UCONTEXT+POLL+IPv4 with OpenSSL 0.9.7g 11 Apr 2005 2005.04.27 08:41:33 LOG7[24386:1]: RAND_status claims sufficient entropy for the PRNG 2005.04.27 08:41:33 LOG6[24386:1]: PRNG seeded successfully 2005.04.27 08:41:33 LOG7[24386:1]: Configuration SSL options: 0x00000FFF 2005.04.27 08:41:33 LOG7[24386:1]: SSL options set: 0x00000FFF 2005.04.27 08:41:33 LOG7[24386:1]: Certificate: /usr/local/stunnel-4.10/etc/stunnel/stunnel.pem 2005.04.27 08:41:33 LOG7[24386:1]: Key file: /usr/local/stunnel-4.10/etc/stunnel/stunnel.pem 2005.04.27 08:41:33 LOG6[24386:1]: file ulimit = 256 (can be changed with 'ulimit -n') 2005.04.27 08:41:33 LOG6[24386:1]: poll() used - no FD_SETSIZE limit for file descriptors 2005.04.27 08:41:33 LOG5[24386:1]: 125 clients allowed 2005.04.27 08:41:33 LOG7[24386:1]: FD 5 in non-blocking mode 2005.04.27 08:41:33 LOG7[24386:1]: FD 6 in non-blocking mode 2005.04.27 08:41:33 LOG7[24386:1]: FD 7 in non-blocking mode 2005.04.27 08:41:33 LOG7[24386:1]: SO_REUSEADDR option set on accept socket 2005.04.27 08:41:33 LOG7[24386:1]: https bound to 0.0.0.0:443 2005.04.27 08:41:33 LOG7[24386:1]: Created pid file /usr/local/stunnel-4.10/var/stunnel/stunnel.pid 2005.04.27 08:41:33 LOG7[24386:0]: Waiting -1 second(s) for 2 file descriptor(s) 2005.04.27 08:41:35 LOG7[24386:0]: CONTEXT 1, FD=5, (IN)->() 2005.04.27 08:41:35 LOG7[24386:0]: CONTEXT 1, FD=7, (IN)->(IN) 2005.04.27 08:41:35 LOG7[24386:1]: https accepted FD=9 from 162.25.222.252:35728 2005.04.27 08:41:35 LOG7[24386:1]: Creating a new context 2005.04.27 08:41:35 LOG7[24386:1]: Context 2 created 2005.04.27 08:41:35 LOG7[24386:2]: https started 2005.04.27 08:41:35 LOG7[24386:2]: FD 9 in non-blocking mode 2005.04.27 08:41:35 LOG5[24386:2]: https connected from 162.25.222.252:35728 2005.04.27 08:43:08 LOG7[24386:2]: SSL state (accept): before/accept initialization 2005.04.27 08:43:08 LOG7[24386:2]: SSL state (accept): SSLv3 read client hello A 2005.04.27 08:43:08 LOG7[24386:2]: SSL state (accept): SSLv3 write server hello A 2005.04.27 08:43:08 LOG7[24386:2]: SSL state (accept): SSLv3 write certificate A 2005.04.27 08:43:08 LOG7[24386:2]: SSL state (accept): SSLv3 write server done A 2005.04.27 08:43:08 LOG7[24386:2]: SSL state (accept): SSLv3 flush data ************************************************************************ thanks for your time and help regards toni -- Wer es einmal so weit gebracht hat, dass er nicht | toni at stderror dot at mehr irrt, der hat auch zu arbeiten aufgehoert | Toni Schmidbauer -- Max Planck |

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stunnel crash when multiple connections
by Debin Chen 27 Apr '05

27 Apr '05

Hi, I will appreciate greatly if you can diagnose the following crash problem: I am using stunnel 4.05, working with webserver thttpd to provide a https solution, in linux environment. First I wrote down some noticeable behavior of stunnel. 1) stunnel each time spawns a thread to handle the https connection then destroy the thread. If I browse a lot of pages, then internally a lot of thread ( or process) got created and destroyed. 2) Sometimes after a https request is completed, the thread is still there. Only following request will trigger the thread got destroyed. Normally if there is no activity, just 2 threads left. The problem: During some stress testing, such as multiple ( in my case, actually just 2 or 3) web browser simultaneously issues request to the web server in https, I found out in certain moment stunnel spawns more than 5 or 6 threads to handle the connections, sometimes it crashed without giving out any serious debug error messages. When it crashed, system resource of CPU and memory is still sufficient. Note than I already set timeoutclose=0, that should be done. Best Regards Debin Chen ======================================== Advanced Storage Division Promise Technology, Inc. 580 Cottonwood Drive, Milpitas, CA 95035 Tel: 408-228-1529 CONFIDENTIALITY NOTICE: The information contained in or attached to this email message is either proprietary and/or confidential information, or information intended solely for the use of the individual or entity named above. If the reader of this message is not the intended recipient, or the employee or agent responsible to deliver it to 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 immediately notify us by email and delete the original message from your computer/server with confirmation to us that you have done so. Thank you.

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connect directly to unix domain socket?
by Marty Lamb 25 Apr '05

25 Apr '05

Hello, Sorry for the newb question, but I've done quite a bit of searching and haven't found a definitive answer either way - and I doubt I'm the first to ask about this. Is there any way to connect an incoming connection directly to a unix domain socket? Some sort of service level option like: connect = /path/to/socket would be ideal, and hopefully I'm just missing something in the docs. If this is not available, I can just exec socat - but that seems like an unnecessary step. Thanks much, Marty

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Newbie question
by Rick Kubowic 25 Apr '05

25 Apr '05

I'm trying to implement a secure TCP tunnel from one PC to another. I've been looking for quite some time and can't seem to find the problem. I've been following the following example of how to start a server service: stunnel -p /path/to/stunnel.pem -d pop3s -r bar:pop3 I've created a generic certificate, but I get the error: Failed to open configuration file -p What am I doing wrong?? Rick Kubowicz ITG Canada Corp. 416-874-0834

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Mailing list web interface
by Michal Trojnara 24 Apr '05

24 Apr '05

Dear Users, I'm glad to announce that mirt.net server is now fully moved to the new location. I hope you'll enjoy the speed. 8-) The mailing list management web interface is operational, again. Best regards, Mike

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Stunnel 4.10 released
by Michal Trojnara 23 Apr '05

23 Apr '05

Here is the ChangeLog entry: Version 4.10, 2005.04.23, urgency: LOW/EXPERIMENTAL: * DLLs for OpenSSL 0.9.7g. * Bugfixes - Missing locking on Win32 platform was added (thx to Yi Lin <yi.lin(a)convergys.com>) - Some problems with closing SSL fixed. * New features - New UCONTEXT user-level non-preemptive threads model is used on systems that support SYSV-compatible ucontext.h. - Improved stunnel3 script with getopt-compatible syntax. * Release notes - This version should be thoroughly tested before using it in the mission-critical environment. Homepage: http://stunnel.mirt.net/ Download: ftp://stunnel.mirt.net/stunnel/ Best regards, Mike

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Patch: Windows version of stunnel 4.09 is not thread-safe
by yi.lin＠convergys.com 23 Apr '05

23 Apr '05

We have been using stunnel on Windows as a SSL proxy to connect to HTTPS server but stunnel kept crashing randomly under load. After some investigation, we found the following: according to OpenSSL document (http://www.openssl.org/docs/crypto/threads.html), "OpenSSL can safely be used in multi-threaded applications provided that at least two callback functions are set. locking_function(int mode, int n, const char *file, int line) is needed to perform locking on shared data structures. (Note that OpenSSL uses a number of global data structures that will be implicitly shared whenever multiple threads use OpenSSL.) Multi-threaded applications will crash at random if it is not set. " The original stunnel package only implements a POSIX Pthread version of locking callback functions, but doesn't provide any implementation for Windows. This has caused random crashes during our testing because the way we use stunnel requires frequent creation/destruction of threads and stunnel is not thread-safe without the locking callbacks. The attached fix attempts to address the problem by implementing the Windows version of locking callbacks using Windows native CRITICAL_SECTION object. =============================================================================================================================== *** sthreads.c Fri Dec 31 02:55:40 2004 --- sthreads_w32.c Thu Apr 14 08:29:07 2005 *************** *** 121,126 **** --- 121,127 ---- #ifdef USE_WIN32 CRITICAL_SECTION stunnel_cs[CRIT_SECTIONS]; + static CRITICAL_SECTION lock_cs[CRYPTO_NUM_LOCKS]; void enter_critical_section(SECTION_CODE i) { EnterCriticalSection(stunnel_cs+i); *************** *** 130,141 **** --- 131,161 ---- LeaveCriticalSection(stunnel_cs+i); } + static void locking_callback(int mode, int type, + #ifdef HAVE_OPENSSL + const /* Callback definition has been changed in openssl 0.9.3 */ + #endif + char *file, int line) { + if(mode&CRYPTO_LOCK) + EnterCriticalSection(lock_cs+type); + else + LeaveCriticalSection(lock_cs+type); + } + + void sthreads_init(void) { int i; /* Initialize stunnel critical sections */ for(i=0; i<CRIT_SECTIONS; i++) InitializeCriticalSection(stunnel_cs+i); + + /* Initialize OpenSSL locking callback */ + for(i=0; i<CRYPTO_NUM_LOCKS; i++) + InitializeCriticalSection(lock_cs+i); + CRYPTO_set_locking_callback(locking_callback); + + } unsigned long stunnel_process_id(void) { (See attached file: sthread_diff) Yi Lin Convergys Corporation yi.lin(a)convergys.com (703)885-5767 -- "NOTICE: The information contained in this electronic mail transmission is intended by Convergys Corporation for the use of the named individual or entity to which it is directed and may contain information that is privileged or otherwise confidential. If you have received this electronic mail transmission in error, please delete it from your system without copying or forwarding it, and notify the sender of the error by reply email or by telephone (collect), so that the sender's address records can be corrected."

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connection refsed (111)
by RAJADURAI D 20 Apr '05

20 Apr '05

hi I am trying to connect using mysql, there are no fw between the 2 boxes. I tested with stunnel latest version 4.08 in red hat 9,it shows the last message as connection refused (111) after the cipher negotiation Any ideas on how to solve this error plz help me, to short out this problem ? i am using ==> Stunnel 4.08 redhat 9 Kernel 2.4.20-8 mysql Ver 11.18 Distrib 3.23.54,for redhat-linux-gnu(i386) I am using stunnel.pem generated while installing stunnel 4.08 SERVER SIDE [root@scorpion src]# ./stunnel 2005.03.30 12:23:19 : stunnel with OpenSSL 0.9.7a Feb 19 2003 2005.03.30 12:23:19 : Certificate: /usr/local/etc/stunnel/stunnel.pem 2005.03.30 12:23:19 : Key file: /usr/local/etc/stunnel/stunnel.pem 2005.03.30 12:23:19 : 500 clients allowed 2005.03.30 12:23:19 : SO_REUSEADDR option set on accept socket 2005.03.30 12:23:19 : mysqls bound to 0.0.0.0:3307 2005.03.30 12:23:19 : Created pid file /stunnel.pid 2005.03.30 12:27:01 : mysqls accepted FD=7 from 192.168.2.175:33091 2005.03.30 12:27:01 : mysqls started 2005.03.30 12:27:01 : mysqls connected from 192.168.2.175:33091 2005.03.30 12:27:01 : SSL state (accept): before/accept initialization 2005.03.30 12:27:01 : SSL state (accept): SSLv3 read client hello A 2005.03.30 12:27:01 : SSL state (accept): SSLv3 write server hello A 2005.03.30 12:27:01 : SSL state (accept): SSLv3 write certificate A 2005.03.30 12:27:01 : SSL state (accept): SSLv3 write server done A 2005.03.30 12:27:01 : SSL state (accept): SSLv3 flush data 2005.03.30 12:27:01 : SSL state (accept): SSLv3 read client key exchange A 2005.03.30 12:27:01 : SSL state (accept): SSLv3 read finished A 2005.03.30 12:27:01 : SSL state (accept): SSLv3 write change cipher spec A 2005.03.30 12:27:01 : SSL state (accept): SSLv3 write finished A 2005.03.30 12:27:01 : SSL state (accept): SSLv3 flush data 2005.03.30 12:27:01 : 1 items in the session cache 2005.03.30 12:27:01 : 0 client connects (SSL_connect()) 2005.03.30 12:27:01 : 0 client connects that finished 2005.03.30 12:27:01 : 0 client renegotiatations requested 2005.03.30 12:27:01 : 1 server connects (SSL_accept()) 2005.03.30 12:27:01 : 1 server connects that finished 2005.03.30 12:27:01 : 0 server renegotiatiations requested 2005.03.30 12:27:01 : 0 session cache hits 2005.03.30 12:27:01 : 0 session cache misses 2005.03.30 12:27:01 : 0 session cache timeouts 2005.03.30 12:27:01 : SSL accepted: new session negotiated 2005.03.30 12:27:01 : Negotiated ciphers: AES256-SHA SSLv3 Kx=RSA Au=RSA Enc=AES(256) Mac=SHA1 2005.03.30 12:27:01 : mysqls connecting 127.0.0.1:3306 2005.03.30 12:27:01 : connect_wait: waiting 10 seconds 2005.03.30 12:27:01 : connect_wait: getsockopt: Connection refused (111) 2005.03.30 12:27:01 : Failed to initialize remote connection 2005.03.30 12:27:01 : mysqls finished (0 left) ====================================================== CLIENT SIDE [root@redhat src]# ./stunnel 2005.03.30 23:24:42 LOG5[7383:1075999904]: stunnel 4.08 on i686-pc-linux-gnu PTH READ+POLL+IPv4+LIBWRAP with OpenSSL 0.9.7a Feb 19 2003 2005.03.30 23:24:42 LOG7[7383:1075999904]: RAND_status claims sufficient entropy for the PRNG 2005.03.30 23:24:42 LOG6[7383:1075999904]: PRNG seeded successfully 2005.03.30 23:24:42 LOG7[7383:1075999904]: Certificate: /usr/local/etc/stunnel/s tunnel.pem 2005.03.30 23:24:42 LOG7[7383:1075999904]: Key file: /usr/local/etc/stunnel/stun nel.pem 2005.03.30 23:24:42 LOG6[7383:1075999904]: file ulimit = 1024 (can be changed wi th 'ulimit -n') 2005.03.30 23:24:42 LOG6[7383:1075999904]: poll() used - no FD_SETSIZE limit for file descriptors 2005.03.30 23:24:42 LOG5[7383:1075999904]: 500 clients allowed 2005.03.30 23:24:42 LOG7[7383:1075999904]: FD 4 in non-blocking mode 2005.03.30 23:24:42 LOG7[7383:1075999904]: FD 5 in non-blocking mode 2005.03.30 23:24:42 LOG7[7383:1075999904]: FD 6 in non-blocking mode 2005.03.30 23:24:42 LOG7[7383:1075999904]: SO_REUSEADDR option set on accept soc ket 2005.03.30 23:24:42 LOG7[7383:1075999904]: mysqls bound to 0.0.0.0:3306 2005.03.30 23:24:42 LOG7[7383:1075999904]: Created pid file /stunnel.pid 2005.03.30 23:32:19 LOG7[7383:1075999904]: mysqls accepted FD=7 from 127.0.0.1:3 3090 2005.03.30 23:32:19 LOG7[7383:1075999904]: FD 7 in non-blocking mode 2005.03.30 23:32:19 LOG7[7383:1076067520]: mysqls started 2005.03.30 23:32:20 LOG5[7383:1076067520]: mysqls connected from 127.0.0.1:33090 2005.03.30 23:32:20 LOG7[7383:1076067520]: FD 8 in non-blocking mode 2005.03.30 23:32:20 LOG7[7383:1076067520]: mysqls connecting 192.168.2.210:3307 2005.03.30 23:32:20 LOG7[7383:1076067520]: connect_wait: waiting 10 seconds 2005.03.30 23:32:20 LOG7[7383:1076067520]: connect_wait: connected 2005.03.30 23:32:20 LOG7[7383:1076067520]: Remote FD=8 initialized 2005.03.30 23:32:20 LOG7[7383:1076067520]: SSL state (connect): before/connect initialization 2005.03.30 23:32:20 LOG7[7383:1076067520]: SSL state (connect): SSLv3 write client hello A 2005.03.30 23:32:20 LOG7[7383:1076067520]: SSL state (connect): SSLv3 read server hello A 2005.03.30 23:32:20 LOG7[7383:1076067520]: SSL state (connect): SSLv3 read server certificate A 2005.03.30 23:32:20 LOG7[7383:1076067520]: SSL state (connect): SSLv3 read server done A 2005.03.30 23:32:20 LOG7[7383:1076067520]: SSL state (connect): SSLv3 write client key exchange A 2005.03.30 23:32:20 LOG7[7383:1076067520]: SSL state (connect): SSLv3 write change cipher spec A 2005.03.30 23:32:20 LOG7[7383:1076067520]: SSL state (connect): SSLv3 write finished A 2005.03.30 23:32:20 LOG7[7383:1076067520]: SSL state (connect): SSLv3 flush data 2005.03.30 23:32:20 LOG7[7383:1076067520]: SSL state (connect): SSLv3 read finished A 2005.03.30 23:32:20 LOG7[7383:1076067520]: 1 items in the session cache 2005.03.30 23:32:20 LOG7[7383:1076067520]: 1 client connects (SSL_connect()) 2005.03.30 23:32:20 LOG7[7383:1076067520]: 1 client connects that finished 2005.03.30 23:32:20 LOG7[7383:1076067520]: 0 client renegotiatations requeste d 2005.03.30 23:32:20 LOG7[7383:1076067520]: 0 server connects (SSL_accept()) 2005.03.30 23:32:20 LOG7[7383:1076067520]: 0 server connects that finished 2005.03.30 23:32:20 LOG7[7383:1076067520]: 0 server renegotiatiations request ed 2005.03.30 23:32:20 LOG7[7383:1076067520]: 0 session cache hits 2005.03.30 23:32:20 LOG7[7383:1076067520]: 0 session cache misses 2005.03.30 23:32:20 LOG7[7383:1076067520]: 0 session cache timeouts 2005.03.30 23:32:20 LOG6[7383:1076067520]: SSL connected: new session negotiated 2005.03.30 23:32:20 LOG6[7383:1076067520]: Negotiated ciphers: AES256-SHA SSLv3 Kx=RSA Au=RSA Enc=AES(256) Mac=SHA1 2005.03.30 23:32:20 LOG3[7383:1076067520]: SSL_read: Connection reset by peer (1 04) 2005.03.30 23:32:20 LOG5[7383:1076067520]: Connection reset: 0 bytes sent to SSL , 0 bytes sent to socket 2005.03.30 23:32:20 LOG7[7383:1076067520]: mysqls finished (0 left) RUNNING mysqL IN AN SEPARATE TERMINAL [root@redhat bharathi]# mysql -h 127.0.0.1 -u anirudh -p Enter password: ERROR 2013: Lost connection to MySQL server during query

2 2

Disabling IPv6
by Punitha 20 Apr '05

20 Apr '05

Hello Everyone !! I need to build Stunnel-4.09 in HP-UX11.11 without the support of IPv6. I did not use --enable-ipv6 option. In the configure log I could see the reference of getaddrinfo and getnameinfo functions. Is that refers any of the system file or the function defined in the souce code? I used `nm stunnel | grep getaddrinfo` and it shows the following. $ nm stunnel | grep getaddrinfo getaddrinfo | |undef |code | getaddrinfo | 118768|uext |stub | $ I need to confirm the source(from where they are taken) of getaddrinfo and getnameinfo functions. Is that related with the support of ipv6 in any way? Any of you please make me clear. Thanx in ADVANCE. Regards, Punitha.

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