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https://issues.apache.org/jira/browse/SOLR-16551?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Alex Deparvu updated SOLR-16551:
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Description:
The PKIAuthenticationPlugin [0] plugin will secure inter-node communication by
injecting a custom header that will allow any destination node to verify
tampering of message by checking against source node's public key. This header
also contains a TTL value that exists to prevent replay attacks (default is 5
seconds).
Under very high load for increased periods of time, messages can start to
expire, causing a spike in authorization errors. by trial and error, increasing
the TTL value high enough seems to help the cluster get over the hump but it
potentially only pushes the problem a bit futher ahead. Enabling inter-node
encryption [1] can provide sufficient protection in transit so that the TTL
check could be skipped.
I am proposing to introduce a new system property that will allow disabling of
the TTL check only ("pkiauth.disableTTLVerification" name open to suggestions).
Note. The original description of this ticket has changed. based on the
discussion below I have reduced the scope to introducing a system property as
needed, off by default.
[0]
https://solr.apache.org/guide/solr/latest/deployment-guide/authentication-and-authorization-plugins.html#pkiauthenticationplugin
[1] https://solr.apache.org/guide/solr/latest/deployment-guide/enabling-ssl.html
was:
The PKIAuthenticationPlugin [0] plugin will secure inter-node communication by
injecting a custom header that will allow any destination node to verify
tampering of message by checking against source node's public key. This header
also contains a TTL value that exists to prevent replay attacks (default is 5
seconds).
Under very high load for increased periods of time, messages can start to
expire, causing a spike in authorization errors. by trial and error, increasing
the TTL value high enough seems to help the cluster get over the hump, but
setting it too high will raise security concerns.
This begs the question: is there any circumstance under which it is safe to
disable the "header sign and check with TTL" mechanism. It seems that enabling
inter-node encryption [1] can provide sufficient protection in transit so that
the header approach would no longer be required.
I am opening this ticket to gather feedback from the community. First, is this
something that others have seen (heavy load can lead to 401s on inter-node
requests). Second, is the approach to disable the PKI plugin sensible or would
it cause more confusion and/or security troubles?
[0]
https://solr.apache.org/guide/solr/latest/deployment-guide/authentication-and-authorization-plugins.html#pkiauthenticationplugin
[1] https://solr.apache.org/guide/solr/latest/deployment-guide/enabling-ssl.html
> Provide a way to disable the PKIAuthenticationPlugin
> ----------------------------------------------------
>
> Key: SOLR-16551
> URL: https://issues.apache.org/jira/browse/SOLR-16551
> Project: Solr
> Issue Type: Improvement
> Security Level: Public(Default Security Level. Issues are Public)
> Components: Authentication
> Affects Versions: 8.6.3
> Reporter: Alex Deparvu
> Priority: Minor
>
> The PKIAuthenticationPlugin [0] plugin will secure inter-node communication
> by injecting a custom header that will allow any destination node to verify
> tampering of message by checking against source node's public key. This
> header also contains a TTL value that exists to prevent replay attacks
> (default is 5 seconds).
> Under very high load for increased periods of time, messages can start to
> expire, causing a spike in authorization errors. by trial and error,
> increasing the TTL value high enough seems to help the cluster get over the
> hump but it potentially only pushes the problem a bit futher ahead. Enabling
> inter-node encryption [1] can provide sufficient protection in transit so
> that the TTL check could be skipped.
> I am proposing to introduce a new system property that will allow disabling
> of the TTL check only ("pkiauth.disableTTLVerification" name open to
> suggestions).
> Note. The original description of this ticket has changed. based on the
> discussion below I have reduced the scope to introducing a system property as
> needed, off by default.
> [0]
> https://solr.apache.org/guide/solr/latest/deployment-guide/authentication-and-authorization-plugins.html#pkiauthenticationplugin
> [1]
> https://solr.apache.org/guide/solr/latest/deployment-guide/enabling-ssl.html
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