[stunnel-users] Configure Error

Rob Lockhart rlockhar at gmail.com
Thu Apr 13 23:27:32 CEST 2017

According to this:

RHEL5 is out of support as of 3/31/2017 for patches, except for security
patching. No new features will be added to RHEL5, to include TLS v1.1
support (requires OpenSSL 1.0.x).

First compile OpenSSL 1.0.2 (in a different path), then compile Stunnel
(5.41) using the /usr/local for the prefix (per previous links), and
perhaps some other switches too (based on info from those URLs).

>From the links I found, you can have multiple versions of OpenSSL, but you
have to link to one when compiling Stunnel. The one you choose when
compiling Stunnel will want to be the newer one you compiled. IMHO, I would
migrate your RHEL5 to RHEL6 or RHEL7, but that may be considerably more
difficult than just compiling OpenSSL and Stunnel.

​ -Rob​

On Thu, Apr 13, 2017 at 4:15 PM, Kenway Ng <kenwayng at gmail.com> wrote:

> Please let me know if I am completely off.  The version of openssl we are
> running is 0.9.8e-fips-rhel5 01 Jul 2008.   So if we want version  TLS1.1+
> then we need to recompile the STUNNEL src with an updated version of
> openssl we are running on our server.  Something higher than 0.9.8.   Is
> that right ?  Is it possible to find a version that was already compiled
> with a higher version of openssl ?
> On Wed, Apr 12, 2017 at 5:49 PM, Rob Lockhart <rlockhar at gmail.com> wrote:
>> On Wed, Apr 12, 2017 at 5:22 PM, Kenway Ng <kenwayng at gmail.com> wrote:
>>> I am trying to upgrade our version of stunnel.  Our SME left and now I
>>> am trying to upgrade stunnel to fix a vulnerability .  I am being told to
>>> use TLS1.1 or higher
>>> $ ./stunnel -version
>>> stunnel 4.15 on x86_64-redhat-linux-gnu with OpenSSL 0.9.8e-fips-rhel5
>>> 01 Jul 2008
>> ​I don't have RHEL5 64-bit but these links may help:
>> https://miteshshah.github.io/linux/centos/how-to-enable-open
>> ssl-1-0-2-a-tlsv1-1-and-tlsv1-2-on-centos-5-and-rhel5/
>> http://serverfault.com/questions/296765/cannot-find-ssl-libr
>> aries-when-configuring-stunnel​
>> ​These links involve re-compiling OpenSSL and Stunnel, in that order. I
>> would opt for OpenSSL 1.0.2k (latest as of 20170412) since 1.0.1 and below
>> are all EOL as of 12/31/2016. OpenSSL 0.9.8 supports only TLS v1.0​,
>> whereas OpenSSL 1.0.1 supports TLS v1.0, v1.1 and v1.2.
>>  -Rob
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