[stunnel-users] Stunnel Connectivity Issue

Liz Turi lturi at maehc.org
Tue Jun 13 18:10:08 CEST 2017


I’m not sure I understand your use case.

The connection is negotiated at the time of connection (you can see in your logs where stunnel receives a connection, and forwards it to its destination, where the TLS connection is negotiated at that point – it effective renegotiates at each connection attempt.

So – for example – if you’re looking to send a SOAP request and receive a response, the connection stays open until it receives the SOAP response (or times out, whichever comes first).

When you’re testing with a telnet command, that transaction time is very short (read subseconds usually). My SOAP request takes a couple of seconds.

That being said, I did find a reference in the archives that might help point you in the right direction for your use case: https://www.stunnel.org/pipermail/stunnel-users/2013-July/004277.html

Liz Turi
Sr. Consultant
Massachusetts eHealth Collaborative
860 Winter Street, Waltham, MA 02451
(m) 339-222-6614 (o) 781-907-7204 (f) 781-207-8589
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From: Dheeraj Gautam [mailto:dheeraj.gautam at arborfs.com]
Sent: Tuesday, June 13, 2017 12:02 PM
To: Liz Turi <lturi at maehc.org>; 'Małgorzata Olszówka' <Malgorzata.Olszowka at stunnel.org>
Cc: stunnel-users at stunnel.org
Subject: RE: [stunnel-users] Stunnel Connectivity Issue

Hi Liz,

Thanks for your reply.

Actually we need to run a service which will work only once stunnel connection establish and the service will work till the time connection connected.

But at the moment I don’t have idea like how the stunnel will remain connected.

Could you please suggest me to fix this so that stunnel connection remain connected and I can run the application.

Waiting for your valuable response.

Regards,

Dheeraj Gautam

From: Liz Turi [mailto:lturi at maehc.org]
Sent: Tuesday, June 13, 2017 9:19 PM
To: Dheeraj Gautam <dheeraj.gautam at arborfs.com<mailto:dheeraj.gautam at arborfs.com>>; Małgorzata Olszówka <Malgorzata.Olszowka at stunnel.org<mailto:Malgorzata.Olszowka at stunnel.org>>
Cc: stunnel-users at stunnel.org<mailto:stunnel-users at stunnel.org>
Subject: RE: [stunnel-users] Stunnel Connectivity Issue

Hi, Dheeraj,

Are you testing the connection with Telnet? Or are you testing with the application. What I noticed in testing the connection is that once the command is completed, the connection is closed.

However, when I test from my application, its only closed once all transactions in that session are completed, and will show how much data was passed on (following from my logs at the end of a non-telnet test session.

2017.06.13 10:16:08 LOG6[1]: Negotiated TLSv1.2 ciphersuite AES256-GCM-SHA384 (256-bit encryption)
2017.06.13 10:16:18 LOG6[1]: Read socket closed (readsocket)
2017.06.13 10:16:18 LOG6[1]: SSL_shutdown successfully sent close_notify alert
2017.06.13 10:16:18 LOG6[1]: TLS closed (SSL_read)
2017.06.13 10:16:18 LOG5[1]: Connection closed: 2791 byte(s) sent to TLS, 1641 byte(s) sent to socket

Liz Turi
Sr. Consultant
Massachusetts eHealth Collaborative
860 Winter Street, Waltham, MA 02451
(m) 339-222-6614 (o) 781-907-7204 (f) 781-207-8589
www.maehc.org<http://www.maehc.org>
[fb_icon]<https://www.facebook.com/massachusettsehealthcollab?fref=nf>[li_icon]<https://www.linkedin.com/company/massachusetts-ehealth-collaborative?trk=tyah&trkInfo=clickedVertical%3Acompany%2Cidx%3A1-1-1%2CtarId%3A1432746657126%2Ctas%3AMassachusetts+eHEalth>[tw_icon]<https://twitter.com/MAeHC_org>

From: stunnel-users [mailto:stunnel-users-bounces at stunnel.org] On Behalf Of Dheeraj Gautam
Sent: Tuesday, June 13, 2017 11:41 AM
To: Małgorzata Olszówka <Malgorzata.Olszowka at stunnel.org<mailto:Malgorzata.Olszowka at stunnel.org>>
Cc: stunnel-users at stunnel.org<mailto:stunnel-users at stunnel.org>
Subject: Re: [stunnel-users] Stunnel Connectivity Issue

HI Guys,

below is the config which i have configured with TLSv1.2, but still connection establishing only for while when i telnet telnet 127.0.0.1 9233. and just after connection closed.

[TCP]
client=yes
cert = BBG_cert.pem
key = BBG_key.pem
verifyChain = yes
CAfile = BBG_CACerts.pem
connect = 69.191.198.34:8228<http://69.191.198.34:8228>
accept  = 127.0.0.1:9233<http://127.0.0.1:9233>
sslVersion = TLSv1.2

below the logs:

2017.06.13 11:57:49 LOG5[main]: Reading configuration from file stunnel.conf
2017.06.13 11:57:49 LOG5[main]: UTF-8 byte order mark detected
2017.06.13 11:57:49 LOG5[main]: FIPS mode disabled
2017.06.13 11:57:49 LOG3[main]: Service [TCP]: Each service must define two endpoints
2017.06.13 11:57:49 LOG3[main]: Failed to reload the configuration file
2017.06.13 16:37:16 LOG5[main]: Reading configuration from file stunnel.conf
2017.06.13 16:37:16 LOG5[main]: UTF-8 byte order mark detected
2017.06.13 16:37:16 LOG5[main]: FIPS mode disabled
2017.06.13 16:37:16 LOG4[main]: Service [TCP] uses "verifyChain" without subject checks
2017.06.13 16:37:16 LOG4[main]: Use "checkHost" or "checkIP" to restrict trusted certificates
2017.06.13 16:37:16 LOG5[main]: Configuration successful
2017.06.13 16:38:38 LOG5[11]: Service [TCP] accepted connection from 127.0.0.1:62736<http://127.0.0.1:62736>
2017.06.13 16:38:38 LOG5[11]: s_connect: connected 69.191.198.34:8228<http://69.191.198.34:8228>
2017.06.13 16:38:38 LOG5[11]: Service [TCP] connected remote server from 172.16.1.23:62737<http://172.16.1.23:62737>
2017.06.13 16:38:39 LOG5[11]: Certificate accepted at depth=0: C=US, ST=NEW YORK, L=NEW YORK, O=Bloomberg LP, OU=FIXBETA, CN=fixbeta.bloomberg.com<http://fixbeta.bloomberg.com>, emailAddress=caadmin at bloomberg.com<mailto:caadmin at bloomberg.com>
2017.06.13 16:39:10 LOG5[11]: Connection closed: 0 byte(s) sent to TLS, 0 byte(s) sent to socket

i want connection remained connected every time so that i can run the application.

application can be work only if the connection remain connected.

please help me to sort this out.

Regards,

Dheeraj Gautam

On 25 May 2017 at 12:29, Małgorzata Olszówka <Malgorzata.Olszowka at stunnel.org<mailto:Malgorzata.Olszowka at stunnel.org>> wrote:
Could you please let us know what parameters we are missing here due to which connection is not establishing with remote server.

Although, stunnel logs indicating that configuration successful, but in logs no where is mentioned about the connection is it connected or not,


Hello Dheeraj,

You should set the verifyChain option in order to verify the certificate stored in the file specified with CAfile:
verifyChain = yes

Then you can test your connection:
telnet 127.0.0.1 9233
the stunnel logs will show information about the connection attempt.

Regards,
Małgorzata
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