December 2010 - stunnel-users

Stunnel 4 failing to connect to gmail
by Asif Iqbal 11 Dec '20

11 Dec '20

I am faling to connect to gmail. Not sure what that bind error means. iqbala@ghar:~$ sudo stunnel4 2008.12.15 13:53:17 LOG7[3839:3083650736]: Snagged 64 random bytes from /home/iqbala/.rnd 2008.12.15 13:53:17 LOG7[3839:3083650736]: Wrote 1024 new random bytes to /home/iqbala/.rnd 2008.12.15 13:53:17 LOG7[3839:3083650736]: RAND_status claims sufficient entropy for the PRNG 2008.12.15 13:53:17 LOG7[3839:3083650736]: PRNG seeded successfully 2008.12.15 13:53:17 LOG7[3839:3083650736]: Certificate: /etc/stunnel/stunnel.pem 2008.12.15 13:53:17 LOG7[3839:3083650736]: Certificate loaded 2008.12.15 13:53:17 LOG7[3839:3083650736]: Key file: /etc/stunnel/stunnel.pem 2008.12.15 13:53:17 LOG7[3839:3083650736]: Private key loaded 2008.12.15 13:53:17 LOG7[3839:3083650736]: SSL context initialized for service ssmtp 2008.12.15 13:53:17 LOG5[3839:3083650736]: stunnel 4.22 on i486-pc-linux-gnu with OpenSSL 0.9.8g 19 Oct 2007 2008.12.15 13:53:17 LOG5[3839:3083650736]: Threading:PTHREAD SSL:ENGINE Sockets:POLL,IPv6 Auth:LIBWRAP 2008.12.15 13:53:17 LOG6[3839:3083650736]: file ulimit = 1024 (can be changed with 'ulimit -n') 2008.12.15 13:53:17 LOG6[3839:3083650736]: poll() used - no FD_SETSIZE limit for file descriptors 2008.12.15 13:53:17 LOG5[3839:3083650736]: 500 clients allowed 2008.12.15 13:53:17 LOG7[3839:3083650736]: FD 10 in non-blocking mode 2008.12.15 13:53:17 LOG7[3839:3083650736]: FD 11 in non-blocking mode 2008.12.15 13:53:17 LOG7[3839:3083650736]: FD 12 in non-blocking mode 2008.12.15 13:53:17 LOG7[3839:3083650736]: SO_REUSEADDR option set on accept socket 2008.12.15 13:53:17 LOG3[3839:3083650736]: Error binding ssmtp to 74.125.93.111:587 2008.12.15 13:53:17 LOG3[3839:3083650736]: bind: Cannot assign requested address (99) Here is how my conf file looks like iqbala@ghar:~$ cat /etc/stunnel/stunnel.conf | egrep -v "^;|^$" cert = /etc/stunnel/stunnel.pem foreground = yes sslVersion = SSLv3 chroot = /var/lib/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 = yes [ssmtp] accept = smtp.gmail.com:587 connect = 25 Asif Iqbal PGP Key: 0xE62693C5 KeyServer: pgp.mit.edu

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patch for using stunnel as client with pkcs11-engine and opensc smartcard
by Märt Laak 29 Jan '12

29 Jan '12

Dear stunnel managers, I would like to inform you that there exist some incompatibility with stunnel and openssl pkcs11-engine with external PIN entry device (like RSA smartcard using opensc) in Linux. We use this config to load openssl engine stunnel.conf: --- engine=dynamic engineCtrl=SO_PATH:/usr/lib/engines/engine_pkcs11.so engineCtrl=ID:pkcs11 engineCtrl=LIST_ADD:1 engineCtrl=LOAD engineCtrl=MODULE_PATH:/usr/lib/opensc-pkcs11.so engineCtrl=INIT --- Problem is, with this setup stunnel does not allow user to enter PIN for the secret key. Instead it tries to get secret key without PIN, 3 times (and then therefore usually blocks card PIN) and retires: ---- Initializing engine 1 Engine 1 initialized PRNG seeded successfully Certificate: mart.pem Certificate loaded Key file: id_01 error queue: 26096080 : error:26096080:engine routines:ENGINE_load_private_key:failed loading private key error queue: 800050A0 : error:800050A0:PKCS11 library:PKCS11_login:PIN incorrect Wrong PIN: retrying error queue: 26096080 : error:26096080:engine routines:ENGINE_load_private_key:failed loading private key error queue: 800050A0 : error:800050A0:PKCS11 library:PKCS11_login:PIN incorrect Wrong PIN: retrying error queue: 26096080 : error:26096080:engine routines:ENGINE_load_private_key:failed loading private key ENGINE_load_private_key: 800050A0: error:800050A0:PKCS11 library:PKCS11_login:PIN incorrect ---- I discovered workaround that is valid form version 4.26 till current 4.34, as follows, NULL-ing the ui_data.method property in ctx.c: --- diff -cr stunnel-4.34/src/ctx.c stunnel-4.34-patched/src/ctx.c *** stunnel-4.34/src/ctx.c 2010-09-14 18:08:43.000000000 +0300 --- stunnel-4.34-patched/src/ctx.c 2010-09-28 21:56:36.219081931 +0300 *************** *** 304,309 **** --- 304,310 ---- UI_method_set_reader(ui_method, pin_cb); #else /* USE_WIN32 */ ui_method=UI_OpenSSL(); + ui_data.section = NULL; #endif /* USE_WIN32 */ if(section->engine) for(i=1; i<=3; i++) { --- After that patch private key loads correctly: --- Initializing engine 1 Engine 1 initialized PRNG seeded successfully Certificate: mart.pem Certificate loaded Key file: id_01 private key loaded --- It would be nice if: * somebody investigates more precisely why the OpenSSL PIN entry is not showing with unpached stunnel * include my or better patch for this situation Thank you very much for excellent piece of software! With best regards, Märt Laak

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Re: [stunnel-users] Stunnel on the same machine
by subrata＠indiatimes.com 01 Aug '11

01 Aug '11

The configuration files are : pid = /var/stunnel.pid ;chroot = /var/lib/stunnel setuid = nobody setgid = nobody foreground =yes ; Use it for client mode client = yes ; Service-level configuration [pop3s] accept = 995 connect = 110 [imaps] accept = 993 connect = 143 [ssmtp] accept = 465 connect = 25 [mysqls] accept = 3307 connect = 192.168.1.6:3307 On 192.168.1.6 ---------------------- pid = /var/stunnel.pid setuid =nobody setgid = nobody foreground = yes client = no ; Service-level configuration [pop3s] accept = 995 connect = 110 [imaps] accept = 993 connect = 143 [ssmtp] accept = 465 connect = 25 [mysqls] accept =3307 connect =3306 connecting like /usr/local/mysql/bin/mysql -h 127.0.0.1 -u root -p -P 3307 Enter password: On entring password the following lines appear : ERROR 2013 (HY000): Lost connection to MySQL server at 'reading initial communication packet', system error: 104 Subrata ----- Original Message ----- From: Brian Hatch <bri(a)stunnel.org> To: subrata(a)indiatimes.com Sent: Sun, 7 Oct 2007 10:02:17 +0530 (IST) Subject: Re: [stunnel-users] Stunnel on the same machine Near 2007-10-05 22:17 +0530, subrata(a)indiatimes.com insisted: > After starting stunnel and connecting the mysql client/usr/local/mysql/bin/mysql -h 127.0.0.1 -u root -p the flow gets stuck at the Enter password prompt any suggestions how to proceed from there. What do your stunnel configuration files look like? Other problem: mysql client may decide to use a local domain socket when connecting to localhost, thwarting your attempts to go via Stunnel. You might want to 'strace mysql ...' and look for the connect() lines. -- Brian Hatch Time flies like an Systems and arrow. Fruit flies Security Engineer like a banana. http://www.ifokr.org/bri/ Every message PGP signed -- My life has changed. What about yours? Log on to the new Indiatimes Mail and Live out of the Inbox!

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Stunnel 4.33 released
by Michal Trojnara 22 Apr '11

22 Apr '11

The ChangeLog entry: Version 4.33, 2010.04.05, urgency: MEDIUM: * New features - Win32 DLLs for OpenSSL 1.0.0. This library requires to c_rehash CApath/CRLpath directories on upgrade. - Win32 DLLs for zlib 1.2.4. - Experimental support for local mode on WIN32 platform. Try "exec = c:\windows\system32\cmd.exe". * Bugfixes - Inetd mode fixed SHA-1 value for stunnel-4.33.tar.gz: 695c7ef834952cb8ddbc790e10b6e32798fc2767 Home page: http://stunnel.mirt.net/ Download: ftp://stunnel.mirt.net/stunnel/ Best regards, Michal Trojnara

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Stunnel forwarding IP
by oscaruser＠programmer.net 15 Jan '11

15 Jan '11

Folks, For my server daemon process, I am accepting incoming requests only from pre-seeded IP addrs. Using Stunnel, I am finding connecting IPs are '127.0.0.1' or localhost. Is there any configuration or solution to represent incoming IPs for the given file descriptor belonging to their originating IP addrs? Thank you.

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Is it possible to encrypt the Web server IP , URL , Data???
by cpu.lin 20 Dec '10

20 Dec '10

Dear Michal Trojnara, Some protocols (e.g. ssh,vpn...) must install software in SERVER side. I want to understand the fact below: If only the CLIENT side can install the special software. What is the special software? Is it possible to encrypt the Web server IP ,URL ,Data??? If stunnel can solve this issue. How to configure? Merry X'mas, Best regards, cpu.lin(a)gmail.com > 2010/12/17 Michal Trojnara <Michal.Trojnara(a)mirt.net>: > Dear cpu.lin, > >> No response to the problem: >> > http://stunnel.mirt.net/pipermail/stunnel-users/2010-December/002860.html >> Could you please help me? > > This is how the protocol works: > http://tools.ietf.org/id/draft-luotonen-ssl-tunneling-02.txt > You need a different protocol (e.g. ssh) if you don't like it. > > Mike

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Stunnel 4.05 "SSL write shutdown (output buffer empty)"
by Issam ourrai 17 Dec '10

17 Dec '10

Hi guys, For My apps I'm using a SSL connection using STunnel 4.05 on a windows box. I have the following errors while running a connection : 2010.12.17 14:28:55 LOG7[2764:6312]: Socket closed on read 2010.12.17 14:28:55 LOG7[2764:6312]: SSL write shutdown (output buffer empty) 2010.12.17 14:28:55 LOG7[2764:6312]: SSL alert (write): warning: close notify 2010.12.17 14:28:55 LOG7[2764:6312]: SSL_shutdown retrying 2010.12.17 14:28:55 LOG7[2764:5588]: tradingscreen_connection accepted FD=1728 from 127.0.0.1:2231 2010.12.17 14:28:55 LOG7[2764:5588]: FD 1728 in non-blocking mode 2010.12.17 14:28:55 LOG7[2764:5588]: Creating a new thread 2010.12.17 14:28:55 LOG7[2764:5588]: New thread created 2010.12.17 14:28:55 LOG7[2764:3860]: tradingscreen_connection started 2010.12.17 14:28:55 LOG7[2764:3860]: TCP_NODELAY option set on local socket 2010.12.17 14:28:55 LOG5[2764:3860]: tradingscreen_connection connected from 127.0.0.1:2231 2010.12.17 14:28:55 LOG7[2764:3860]: FD 1708 in non-blocking mode 2010.12.17 14:28:55 LOG7[2764:3860]: tradingscreen_connection connecting XX.XX.XX.XX:9500 2010.12.17 14:28:55 LOG7[2764:3860]: remote connect #1: EWOULDBLOCK: retrying 2010.12.17 14:28:55 LOG7[2764:3860]: waitforsocket: FD=1708, DIR=write 2010.12.17 14:28:55 LOG7[2764:3860]: waitforsocket: ok 2010.12.17 14:28:55 LOG7[2764:3860]: Remote FD=1708 initialized 2010.12.17 14:28:55 LOG7[2764:3860]: TCP_NODELAY option set on remote socket 2010.12.17 14:28:55 LOG7[2764:3860]: SSL state (connect): before/connect initialization 2010.12.17 14:28:55 LOG7[2764:3860]: SSL state (connect): SSLv3 write client hello A 2010.12.17 14:28:55 LOG7[2764:3860]: waitforsocket: FD=1708, DIR=read 2010.12.17 14:28:55 LOG7[2764:3860]: waitforsocket: ok 2010.12.17 14:28:55 LOG7[2764:3860]: SSL state (connect): SSLv3 read server hello A 2010.12.17 14:28:55 LOG7[2764:3860]: waitforsocket: FD=1708, DIR=read 2010.12.17 14:28:56 LOG7[2764:3860]: waitforsocket: ok 2010.12.17 14:28:56 LOG7[2764:3860]: SSL state (connect): SSLv3 read finished A 2010.12.17 14:28:56 LOG7[2764:3860]: SSL state (connect): SSLv3 write change cipher spec A 2010.12.17 14:28:56 LOG7[2764:3860]: SSL state (connect): SSLv3 write finished A 2010.12.17 14:28:56 LOG7[2764:3860]: SSL state (connect): SSLv3 flush data 2010.12.17 14:28:56 LOG7[2764:3860]: 1 items in the session cache 2010.12.17 14:28:56 LOG7[2764:3860]: 2 client connects (SSL_connect()) 2010.12.17 14:28:56 LOG7[2764:3860]: 2 client connects that finished 2010.12.17 14:28:56 LOG7[2764:3860]: 0 client renegotiatations requested 2010.12.17 14:28:56 LOG7[2764:3860]: 0 server connects (SSL_accept()) 2010.12.17 14:28:56 LOG7[2764:3860]: 0 server connects that finished 2010.12.17 14:28:56 LOG7[2764:3860]: 0 server renegotiatiations requested 2010.12.17 14:28:56 LOG7[2764:3860]: 1 session cache hits 2010.12.17 14:28:56 LOG7[2764:3860]: 0 session cache misses 2010.12.17 14:28:56 LOG7[2764:3860]: 0 session cache timeouts 2010.12.17 14:28:56 LOG6[2764:3860]: Negotiated ciphers: DES-CBC3-SHA SSLv3 Kx=RSA Au=RSA Enc=3DES(168) Mac=SHA1 2010.12.17 14:28:56 LOG7[2764:6312]: SSL alert (read): warning: close notify 2010.12.17 14:28:56 LOG7[2764:6312]: SSL closed on SSL_read 2010.12.17 14:28:56 LOG7[2764:6312]: Socket write shutdown (*output buffer empty*) 2010.12.17 14:28:56 LOG5[2764:6312]: Connection closed: 31795 bytes sent to SSL, 35089 bytes sent to socket 2010.12.17 14:28:56 LOG7[2764:6312]: tradingscreen_connection finished (1 left) 2010.12.17 14:39:01 LOG7[2764:3860]: Socket closed on read 2010.12.17 14:39:01 LOG7[2764:3860]: SSL write shutdown (*output buffer empty*) 2010.12.17 14:39:01 LOG7[2764:3860]: SSL alert (write): warning: close notify 2010.12.17 14:39:01 LOG7[2764:3860]: SSL_shutdown retrying 2010.12.17 14:39:01 LOG7[2764:5588]: tradingscreen_connection accepted FD=1732 from 127.0.0.1:2362 2010.12.17 14:39:01 LOG7[2764:5588]: FD 1732 in non-blocking mode 2010.12.17 14:39:01 LOG7[2764:5588]: Creating a new thread Did some one ever face this kind of issue, I'm a neube using this connector, thanks for your kind help, -- Cheers Sam

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Re: [stunnel-users] Experimental stunnel-4.35b1
by Michal Trojnara 17 Dec '10

17 Dec '10

Dear cpu.lin, > No response to the problem: > http://stunnel.mirt.net/pipermail/stunnel-users/2010-December/002860.html > Could you please help me? This is how the protocol works: http://tools.ietf.org/id/draft-luotonen-ssl-tunneling-02.txt You need a different protocol (e.g. ssh) if you don't like it. Mike

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Experimental stunnel-4.35b1
by Michal Trojnara 15 Dec '10

15 Dec '10

Dear Users, I have uploaded stunnel-4.35b1 to ftp://stunnel.mirt.net/stunnel/ for your testing. Please give it a shot and submit any problems to stunnel-users mailing list. This is the way you can not only help me improve production 4.35, but also make sure it's going to work on your platform! Please consider version 4.35b1 highly experimental and not ready for production. Specifically it is no supposed to be packaged for any OS distribution (e.g. *BSD ports). Best regards, Michal Trojnara

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endpoints using different versions of stunnel
by nishith n 15 Dec '10

15 Dec '10

Hello all, We have a client who would like to send us data using stunnel 4.33 at their end of the connection. Can we establish connection from our end using stunnel 4.11 version. We are working on a sun machine. I know I can simply download the latest stunnel version but it has to go through an authorization process which probably will take more time than I have and hence this question. What could be the impacts to connectivity or otherwise with such a setup? Thanks for your replies, Nishith

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