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Add a section into RTD that explains to the users how to configure

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xcatsslversion and xcatsslconfig.  Currently the only documentation
is in the security bulletins
This commit is contained in:
Victor Hu 2017-11-01 13:41:53 -04:00
parent f744bae33f
commit 3ea509cfa2
2 changed files with 58 additions and 1 deletions
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3
docs/source/advanced/security/index.rst
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@ -6,4 +6,5 @@ The security of a system covers a wide range of elements, from the security of s
.. toctree::
:maxdepth: 2
security
ssl_config.rst
security.rst

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docs/source/advanced/security/ssl_config.rst Normal file
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OpenSSL Configuration
=====================
xCAT does not ship OpenSSL RPMS nor does it statically link to any OpenSSL libraries. Communication between the xCAT client and daemon utilizes OpenSSL and the administrator can configure SSL_version and SSL_cipher that should be used by xCAT daemons.
The configuration is stored in the xCAT site table using the ``site.xcatsslversion`` and ``site.xcatsslciphers`` variables.
Configuration
-------------
By default, xCAT ships with ``TLSv1`` configured. The current highest SSL version that can be supported is ``TLSv1.2``.
* For rhels7.x and sles12.x and higher: ::
chtab key=xcatsslversion site.value=TLSv12
* For ubuntu 14.x and higher: ::
chtab key=xcatsslversion site.value=TLSv1_2
* For AIX 7.1.3.x: ::
chtab key=xcatsslversion site.value=TLSv1_2
If running > ``TLSv1``, it is possible to disable insecure ciphers. Here's an example of one possible configuration: ::
"xcatsslciphers","kDH:kEDH:kRSA:!SSLv3:!SSLv2:!aNULL:!eNULL:!MEDIUM:!LOW:!MD5:!EXPORT:!CAMELLIA:!ECDH",,
After making any changes to these configuration values, ``xcatd`` must be restarted: ::
service restart xcatd
If any mistakes have been made and communiation is lost to xCAT, use ``XCATBYPASS`` to fix/remove the bad configuration: ::
XCATBYPASS=1 tabedit site
Validation
----------
Use the ``openssl`` command to validate the SSL configuration is valid and expected.
* To check whether TLSv1 is supported by xcatd: ::
openssl s_client -connect 127.0.0.1:3001 -tls1
* To check if SSLv3 is disabled on ``xcatd``: ::
openssl s_client -connect localhost:3001 -ssl3
You should get a reponse similar to: ::
70367087597568:error:14094410:SSL routines:SSL3_READ_BYTES:sslv3 alert handshake failure:s3_pkt.c:1259:SSL alert number 40
70367087597568:error:1409E0E5:SSL routines:SSL3_WRITE_BYTES:ssl handshake failure:s3_pkt.c:598: