stunnel-users

3 participants
3308 discussions

Intermittent connection resets
by Jordan K 22 Mar '12

22 Mar '12

Hi, I've spent the better part of the day trying to find answers on this, and haven't had much luck. I have two systems that talk to eachother via stunnel. In the last week or so, I have noticed a number of errors in the application using the tunnel (messaging application), requiring multiple re-sends, etc. This is my setup. Both server and client run CentOS 6.2, with the RPM version of stunnel. Though it isn't the latest version, I believe RedHat do release any critical bugs in their updated RPMs. I did also go through the ChangeLog but couldn't find anything implemented since 4.29 that seemed to deal with what I'm seeing. stunnel 4.29 on x86_64-unknown-linux-gnu with OpenSSL 1.0.0-fips 29 Mar 2010 Threading:PTHREAD SSL:ENGINE Sockets:POLL,IPv6 Auth:LIBWRAP Global options debug = 5 pid = /var/run/stunnel.pid RNDbytes = 64 RNDfile = /dev/urandom RNDoverwrite = yes Service-level options cert = /etc/stunnel/stunnel.pem ciphers = ALL:!aNULL:!eNULL:!SSLv2 key = /etc/stunnel/stunnel.pem session = 300 seconds stack = 65536 bytes sslVersion = SSLv3 for client, all for server TIMEOUTbusy = 300 seconds TIMEOUTclose = 60 seconds TIMEOUTconnect = 10 seconds TIMEOUTidle = 43200 seconds verify = none Socket option defaults: Option Accept Local Remote OS default SO_DEBUG -- -- -- 0 SO_DONTROUTE -- -- -- 0 SO_KEEPALIVE -- -- -- 0 SO_LINGER -- -- -- 0:0 SO_OOBINLINE -- -- -- 0 SO_RCVBUF -- -- -- 87380 SO_SNDBUF -- -- -- 16384 SO_RCVLOWAT -- -- -- 1 SO_SNDLOWAT -- -- -- 1 SO_RCVTIMEO -- -- -- 0:0 SO_SNDTIMEO -- -- -- 0:0 SO_REUSEADDR 1 -- -- 0 SO_BINDTODEVICE -- -- -- -- TCP_KEEPCNT -- -- -- 9 TCP_KEEPIDLE -- -- -- 7200 TCP_KEEPINTVL -- -- -- 75 IP_TOS -- -- -- 0 IP_TTL -- -- -- 64 TCP_NODELAY -- -- -- 0 Common config (basically default file released by RedHat, with certs and ports configured) : ---------------- ; Protocol version (all, SSLv2, SSLv3, TLSv1) sslVersion = SSLv3 ; Some security enhancements for UNIX systems - comment them out on Win32 chroot = /var/run/stunnel/ setuid = stunnel setgid = stunnel ; PID is created inside the chroot jail pid = /stunnel.pid ; Some debugging stuff useful for troubleshooting debug = 7 output = /var/log/stunnel.log ------------------- When the connection breaks, the logs (debug=7) on both sides are: Client: 2012.03.21 19:58:14 LOG7[30685:140185543952128]: SSL state (connect): before/connect initialization 2012.03.21 19:58:14 LOG7[30685:140185543952128]: SSL state (connect): SSLv3 write client hello A 2012.03.21 19:58:14 LOG3[30685:140185543952128]: SSL_connect: Peer suddenly disconnected 2012.03.21 19:58:14 LOG5[30685:140185543952128]: Connection reset: 0 bytes sent to SSL, 0 bytes sent to socket Server: 2012.03.21 19:58:14 LOG3[22230:140462283343616]: SSL_accept: Peer suddenly disconnected 2012.03.21 19:58:14 LOG5[22230:140462283343616]: Connection reset: 0 bytes sent to SSL, 0 bytes sent to socket As I mentioned, it happens intermittently, with probably 50% of the connections working just fine, and the rest being disconnected. It ALWAYS seems to happen just after the client 'write client hello A', as opposed to later in the SSL handshake. I ran a tcpdump on both sides, it is below. Note that both the client and the server are NATd behind firewalls, on the server the port stunnel listens on (31112) is opened through the firewall. CLIENT (192.168.22.120, NATd externally as 66.66.66.66): 18:21:57.009887 IP 192.168.22.120.55747 > 77.77.77.77.31112: Flags [S], seq 2556598106, win 14600, options [mss 1460,sackOK,TS val 88488311 ecr 0,nop,wscale 7], length 0 18:21:57.076130 IP 77.77.77.77.31112 > 192.168.22.120.55747: Flags [S.], seq 351052925, ack 2556598107, win 14480, options [mss 1460,sackOK,TS val 646044220 ecr 88488311,nop,wscale 7], length 0 18:21:57.076195 IP 192.168.22.120.55747 > 77.77.77.77.31112: Flags [.], ack 1, win 115, options [nop,nop,TS val 88488377 ecr 646044220], length 0 18:21:57.077234 IP 192.168.22.120.55747 > 77.77.77.77.31112: Flags [P.], seq 1:140, ack 1, win 115, options [nop,nop,TS val 88488378 ecr 646044220], length 139 18:21:57.143582 IP 77.77.77.77.31112 > 192.168.22.120.55747: Flags [.], ack 140, win 122, options [nop,nop,TS val 646044288 ecr 88488378], length 0 18:21:57.143982 IP 77.77.77.77.31112 > 192.168.22.120.55747: Flags [RP.], seq 1, ack 140, win 122, length 0 SERVER (10.65.0.130, NATd externally as 77.77.77.77): 18:21:57.042122 IP 66.66.66.66.7760 > 10.65.0.130.http: Flags [S], seq 4074124673, win 14600, options [mss 1460,sackOK,TS val 88488311 ecr 0,nop,wscale 7], length 0 18:21:57.042161 IP 10.65.0.130.http > 66.66.66.66.7760: Flags [S.], seq 458906148, ack 4074124674, win 14480, options [mss 1460,sackOK,TS val 646044220 ecr 88488311,nop,wscale 7], length 0 18:21:57.108325 IP 66.66.66.66.7760 > 10.65.0.130.http: Flags [.], ack 1, win 115, options [nop,nop,TS val 88488377 ecr 646044220], length 0 18:21:57.109507 IP 66.66.66.66.7760 > 10.65.0.130.http: Flags [P.], seq 1:140, ack 1, win 115, options [nop,nop,TS val 88488378 ecr 646044220], length 139 18:21:57.109532 IP 10.65.0.130.http > 66.66.66.66.7760: Flags [.], ack 140, win 122, options [nop,nop,TS val 646044288 ecr 88488378], length 0 18:21:57.110092 IP 10.65.0.130.http > 66.66.66.66.7760: Flags [P.], seq 1:178, ack 140, win 122, options [nop,nop,TS val 646044288 ecr 88488378], length 177 18:21:57.175518 IP 66.66.66.66.7760 > 10.65.0.130.http: Flags [R.], seq 140, ack 1, win 115, length 0 Based on what I am seeing, a mysterious RST packet gets received by both sides, which causes them to terminate the session. Neither side originates any RST packets. When the connection is successful, the tcpdump looks a lot more normal, with an appropriate FIN exchange closing the session once the data has been sent. My questions are - am I missing something obvious? Am I correct in reading the above as some firewall or router between the two servers breaking the TCP connection by sending TCP RSTs to both endpoints? any help is appreciated. jordan

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running stunnel from inetd
by Guylhem 21 Mar '12

21 Mar '12

Hello To follow up on my test, I would like to try and run stunnel from inetd However I wonder if anyone has an experience, suggestions, and some inetd.conf examples. I read it was possible in the FAQ but I didn't see a lot of examples Should I use a configuration file (for the global parameters) then specify connect= params? ex : 443 stream tcp6 nowait nobody /sbin/stunnel /etc/stunnel.conf connect=127.0.0.1:80 TIMEOUTclose=0 Thanks Guylhem

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question about Ephemeral Diffie-Hellman
by Guylhem 21 Mar '12

21 Mar '12

Hello I've read that EDH calculations were ca cause of significant slow up on http://matt.io/technobabble/hivemind_devops_alert:_nginx_does_not_suck_at_s… I'm running stunnel on a embedded Linux/MIPS, where I'm trying to light up the load. Is it possible to disable EDH? If so, how? I couldn't find any info on that. Thanks Guylhem

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stunnel with smb from 2 networks behind firewalls
by Philippe 21 Mar '12

21 Mar '12

Hello, Here is my setup : [PCA]-------------[Firewall-A]---------------{INTERNET}-----------[45.212.56.178:21213|Firewall-B|192.168.0.1:8139]--------[PCB] PCA : Windows 7 stunnel.conf : [smb] client = yes accept = 10.232.232.232:139 connect = 45.212.56.178:21213 PCB : Ubuntu Oneiric 11.10 stunnel.conf : [smb] accept = 8139 connect = 139 When I try to connect a network drive from PCA to a remote drive of PCB here are the stunnel.log of PCA : 2012.03.19 13:47:02 LOG5[3744:2564]: Reading configuration from file stunnel.conf 2012.03.19 13:47:02 LOG5[3744:2564]: FIPS mode is enabled 2012.03.19 13:47:02 LOG7[3744:2564]: Compression not enabled 2012.03.19 13:47:02 LOG7[3744:2564]: Snagged 64 random bytes from C:/.rnd 2012.03.19 13:47:02 LOG7[3744:2564]: Wrote 0 new random bytes to C:/.rnd 2012.03.19 13:47:02 LOG7[3744:2564]: PRNG seeded successfully 2012.03.19 13:47:02 LOG6[3744:2564]: Initializing SSL context for service smb 2012.03.19 13:47:02 LOG7[3744:2564]: Certificate: stunnel.pem 2012.03.19 13:47:02 LOG7[3744:2564]: Certificate loaded 2012.03.19 13:47:02 LOG7[3744:2564]: Key file: stunnel.pem 2012.03.19 13:47:02 LOG7[3744:2564]: Private key loaded 2012.03.19 13:47:02 LOG7[3744:2564]: SSL options set: 0x01000004 2012.03.19 13:47:02 LOG6[3744:2564]: SSL context initialized 2012.03.19 13:47:02 LOG5[3744:2564]: Configuration successful 2012.03.19 13:47:02 LOG7[3744:2564]: Service smb closed FD=200 2012.03.19 13:47:13 LOG5[3744:3940]: Service smb accepted connection from 10.232.232.232:50004 2012.03.19 13:47:13 LOG5[3744:3940]: connect_blocking: connected 45.212.56.178:21213 2012.03.19 13:47:13 LOG5[3744:3940]: Service smb connected remote server from 192.168.3.4:50005 2012.03.19 13:47:43 LOG3[3744:3940]: readsocket: Connection reset by peer (WSAECONNRESET) (10054) 2012.03.19 13:47:43 LOG5[3744:3940]: Connection reset: 143 bytes sent to SSL, 0 bytes sent to socket No logs on PCB it seems that the SSL connection doesn't cross the firewall B, if not I would saw logs in stunnel.log of PCB isn't it ? What can I do better to make this setup working ? Does the firewall B porforwarding is blocking the process ? Best regards Philippe

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stunnel.conf in %USERAPPDATA%
by Sebastian Rose-Indorf 19 Mar '12

19 Mar '12

Hello, I use Stunnel with Windows. The configuration file "stunnel.conf" and the log file "stunnel.log" are in the %USERAPPDATA%\Stunnel folder. Stunnel starts and works without problems. But the GUI options "Edit stunnel.conf" and "Reload stunnel.conf" do not work. Is remedy possible? Sebastian

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Re: [stunnel-users] stunnel with smb from 2 networks behind firewalls
by Philippe 19 Mar '12

19 Mar '12

I have found the stunnel version on PCB : stunnel 4.35 on x86_64-pc-linux-gnu with OpenSSL 1.0.0e 6 Sep 2011 the version on PCA is 4.52 this is perhaps a too big difference isn't it ? Best Philippe

1 0

Help for connecting to Https
by Ali Kabiri 18 Mar '12

18 Mar '12

Hi I have IP & Port with User & Pass from HttpS server I want connect to this server and using for tunneling, (something like vpn, a little of course!) I use stunnel on iPad Please help me I need this for usual using of Internet Please help me Please... Ali

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Re: [stunnel-users] issue with running stunnel
by Thomas Eifert 18 Mar '12

18 Mar '12

Hi again Dewen; It sounds to me like Stunnel isn't being accessed at all. You should be seeing something in the Stunnel log window. I run Stunnel under Windows, so what I generally do is get Stunnel to listen to the loopback interface at address 127.0.0.1, or some other address within the loopback interface range. As such, if I was attempting to access it with a utility like Netcat, my basic stunnel.conf would look something like this for the client side: debug =7 [service.name] client = yes accept = 127.0.0.1:12035 connect = destination.address:1230 Then, I would point Netcat to the listening address and port. In your case, that might be netcat 127.0.0.1:12035. Then see if Stunnel logs your connection attempt. Again, this is under Windows, so your mileage may vary. Let us know how it works out for you. Regards; Thomas On 3/17/2012 12:32 PM, Dewen Kong wrote: > Hi Thomas, > > Thank you for your help. > > here is the config file in one computer >>> client = yes >>> [ncat] >>> accept = 12035 >>> connect = ***.***.***.***:1230 >> and on this computer, I run the command: cat test.file | >> netcat ***.***.***.***: 12035. to connect the remote server with >> IP( ***.***.***.***) on port 12035. I figure on stunnel will accept >> the port 12035 and connect to the remote server on port 1230 or I >> thought. > > and no another remote server, I run the command netcat -l -p 1230 > which means listen to the port 1230. > > after I run the test, it seems on remote server didn't receive > anything on the port 1230.the log file of stunnel dooesn't have any > record of this communication. the last line of the log file is still > "configuration successfully" > > and the version of stunnel I use is 4.42 > > > any suggests that may be wrong? > > > Dewen Kong > >> >> > > On Fri, Mar 16, 2012 at 10:14 PM, Thomas Eifert <kxkvi(a)wi.rr.com > <mailto:[email protected]>> wrote: > > Dewen; > > I think I misread your post. Please forgive me, as I'm unfamiliar > with the Netcat application. > > If you could provide some additional detail, that might be helpful. > > Regards; > > Thomas > > > > On 3/16/2012 9:38 PM, Thomas Eifert wrote: >> Dewen; >> >> I don't know anything about Netcat, so I'm taking a stab in the >> dark here, but it looks as if >> you're pointing Netcat at port 1230, while your config file >> indicates that Stunnel would be >> listening on port 12035. Try redirecting Netcat to the listening >> port. >> >> If you need to post again, please indicate the version of Stunnel >> you are using, and what >> platform your are running it on. >> >> Regards; >> >> Thomas >> >> >> On 3/16/2012 5:35 PM, Dewen Kong wrote: >>> Hi all, >>> I am a new guy to stunnel. >>> here is the issue I meet, i install my stunnel in the lab. and >>> trying to run the test with netcat. >>> Here is the config file i test: >>> client side: >>> ... >>> ... >>> output = stunnel.log >>> client = yes >>> [ncat] >>> accept = 12035 >>> connect = ***.***.***.***:1230 >>> then I run "stunnel test.conf "and the the log file shows >>> configuration successfully >>> then I run the command "cat test.file | netcat ***.***.***.*** >>> 12035 on the client side >>> and run netcat -l -p 1230 > output >>> nothing happens. >>> And I check the log file. there is no record about the netcat. >>> I don't know what happened. >>> >>> >>> -- >>> */Dewen Kong/* >>> >>> >>> _______________________________________________ >>> stunnel-users mailing list >>> stunnel-users(a)stunnel.org <mailto:[email protected]> >>> http://stunnel.mirt.net/mailman/listinfo/stunnel-users >> >> -- >> Attention: This message and all attachments are private and may contain information that is confidential and privileged. If you received this message in error, please notify the sender by reply email and delete the message immediately. >> >> >> _______________________________________________ >> stunnel-users mailing list >> stunnel-users(a)stunnel.org <mailto:[email protected]> >> http://stunnel.mirt.net/mailman/listinfo/stunnel-users > > -- > Attention: This message and all attachments are private and may contain information that is confidential and privileged. If you received this message in error, please notify the sender by reply email and delete the message immediately. > > > _______________________________________________ > stunnel-users mailing list > stunnel-users(a)stunnel.org <mailto:[email protected]> > http://stunnel.mirt.net/mailman/listinfo/stunnel-users > > > > > -- > */Dewen Kong/* -- Attention: This message and all attachments are private and may contain information that is confidential and privileged. If you received this message in error, please notify the sender by reply email and delete the message immediately.

1 0

win-32 : console version with foreground mode & no icon area activity
by IvankoB for-mse 17 Mar '12

17 Mar '12

Needed to start/terminate/{supply private key password}/{catch errors} via pipe reader/writer (MSEgui pipe components) so that a STunnel session only serves a single application.

1 0

issue with running stunnel
by Dewen Kong 17 Mar '12

17 Mar '12

Hi all, I am a new guy to stunnel. here is the issue I meet, i install my stunnel in the lab. and trying to run the test with netcat. Here is the config file i test: client side: ... ... output = stunnel.log client = yes [ncat] accept = 12035 connect = ***.***.***.***:1230 then I run "stunnel test.conf "and the the log file shows configuration successfully then I run the command "cat test.file | netcat ***.***.***.*** 12035 on the client side and run netcat -l -p 1230 > output nothing happens. And I check the log file. there is no record about the netcat. I don't know what happened. -- *Dewen Kong*

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