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Note: For more details on the protocol option please refer to this page. To force stunnel to pass the original client IP address the protocol directive in stunnel must be added and set to proxy as shown below: Ĭert = /etc//certs/STunnel.pem This is because stunnel is not transparent by default. !( By default, in the above example the IP address in the X-Forward-For header reaching the Web Servers is the load balancers own IP address. For more details on enabling this for IIS and Apache web servers, please see IIS and X-Forwarded-For Headers and Apache and X-Forwarded-For Headers.įor more complicated scenarios where SSL termination is also required on the load balancer and the original source IP address is still required, additional steps are needed. One way around this is to enable X-Forward-For headers for HAProxy (the default for appliances) and configure the web servers to track the IP address in this header. By default, the source IP address of the packet reaching the web servers is the IP address of the load balancer and not the IP address of the client. This occurs for example when HAProxy is used in it's default configuration to load balance a number of back-end web servers. 'debug = 5' logs everything including informational this is the default.When using proxies such as stunnel and HAProxy it's easy to loose track of the client source IP address.
#STUNNEL TIMEOUTCLOSE FULL#
The 'debug' option increases the log level, 0 = no logging, 7 = full logging plus console output. May 6 00:24:36 susie stunnel: LOG5: Connection closed: 13079īytes sent to SSL, 930 bytes sent to socket May 6 00:24:35 susie stunnel: LOG5: https connected from May 6 00:24:18 susie stunnel: LOG5: 500 clients allowed May 6 00:24:18 susie stunnel: LOG5: Threading:PTHREAD May 6 00:24:18 susie stunnel: LOG5: stunnel 4.15 on Susie:/home/stunnel # tail -f /var/log/messages Susie:~ # kill `cat /home/stunnel/var/lib/stunnel/stunnel.pid` 8. Stunnel 15229 nobody 6u IPv4 67679 TCP *:https (LISTEN) Start stunnel and verify it is listening on port 443 Master 1339 root 11u IPv4 3741 TCP localhost:smtp (LISTEN) Sshd 1153 root 5u IPv6 2949 TCP *:ssh (LISTEN) Verify the webserver is running on port 80 and the SSL port 443 is freeĬOMMAND PID USER FD TYPE DEVICE SIZE NODE NAME
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Some debugging stuff useful for troubleshooting Some security enhancements for UNIX systems - comment them out on Win32 CAfile = /home/stunnel/etc/stunnel/cacert.pem key = /home/stunnel/etc/stunnel/stunnel-privkey.pem client certs, we don't need the CA certificate for verification.
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since private key and certificate are in one file, we don't need Certificate/key is needed in server mode and optional in client modeĬert = /home/stunnel/etc/stunnel/stunnel.pem = stunnel configuration for https to http forwarding = susie:~ # vi /home/stunnel/etc/stunnel/nf Adjust the stunnel configuration fileįor more information, see the stunnel manpage. Susie:~ # openssl rsa -in /home/stunnel/etc/stunnel/stunnel.pem -noout -text 4. Susie:~ # openssl x509 -in /home/stunnel/etc/stunnel/stunnel.pem -noout -text The certificate and key can be displayed with openssl: "make install" calls OpenSSL routines and generates a self-signed certificate together with the private key in a single file.
#STUNNEL TIMEOUTCLOSE INSTALL#
with-ssl=/home/openssl make su make install Since I do not plan to use DH, I removed the option and compilation worked with out any. Reasons are two missing pointer declarations in src/ctx.c: Make: Leaving directory `/home/devel/stunnel-4.15/src' with-ssl=/home/openssl -enable-dh -disable-libwrapĬtx.c:170: error: `section' undeclared (first use in this fuĬtx.c:170: error: (Each undeclared identifier is reported onĬtx.c:170: error: for each function it appears in.)Ĭtx.c:198: error: `ctx' undeclared (first use in this functi There is a bug in stunnel when Diffie Hellman support is enabled with -enable-dh in. Susie:/home/devel # ln -s /home/stunnel-4.15 /home/stunnel 3. Susie:/home/devel # mkdir /home/stunnel-4.15 software/stunnel-4.15.tar.gz | tar xf ls stunnel-4 2. In this example, I compiled it from zcat. Source is available at, but many distributions already provide a precompiled package.