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57 lines
1.9 KiB
ReStructuredText
57 lines
1.9 KiB
ReStructuredText
OpenSSL Configuration
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=====================
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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.
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The configuration is stored in the xCAT site table using the ``site.xcatsslversion`` and ``site.xcatsslciphers`` variables.
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Configuration
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-------------
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By default, xCAT ships with ``TLSv1`` configured. The current highest SSL version that can be supported is ``TLSv1.2``.
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* For rhels7.x and sles12.x and higher: ::
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chtab key=xcatsslversion site.value=TLSv12
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* For ubuntu 14.x and higher: ::
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chtab key=xcatsslversion site.value=TLSv1_2
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* For AIX 7.1.3.x: ::
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chtab key=xcatsslversion site.value=TLSv1_2
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If running > ``TLSv1``, it is possible to disable insecure ciphers. Here's an example of one possible configuration: ::
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"xcatsslciphers","kDH:kEDH:kRSA:!SSLv3:!SSLv2:!aNULL:!eNULL:!MEDIUM:!LOW:!MD5:!EXPORT:!CAMELLIA:!ECDH",,
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After making any changes to these configuration values, ``xcatd`` must be restarted: ::
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service restart xcatd
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If any mistakes have been made and communiation is lost to xCAT, use ``XCATBYPASS`` to fix/remove the bad configuration: ::
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XCATBYPASS=1 tabedit site
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Validation
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----------
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Use the ``openssl`` command to validate the SSL configuration is valid and expected.
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* To check whether TLSv1 is supported by xcatd: ::
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openssl s_client -connect 127.0.0.1:3001 -tls1
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* To check if SSLv3 is disabled on ``xcatd``: ::
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openssl s_client -connect localhost:3001 -ssl3
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You should get a reponse similar to: ::
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70367087597568:error:14094410:SSL routines:SSL3_READ_BYTES:sslv3 alert handshake failure:s3_pkt.c:1259:SSL alert number 40
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70367087597568:error:1409E0E5:SSL routines:SSL3_WRITE_BYTES:ssl handshake failure:s3_pkt.c:598:
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