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https://issues.apache.org/jira/browse/HADOOP-15162?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Jason Lowe updated HADOOP-15162:
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Summary: UserGroupInformation.createRemoteUser hardcode authentication
method to SIMPLE (was: UserGroupInformation.createRmoteUser hardcode
authentication method to SIMPLE)
Could you elaborate on how this allows the caller to impersonate anyone?
Putting a check in UGI's createRemoteUser seems like a client-side security
fix, and that's not going to be very helpful since we should never trust the
client. Allowing that UGI to gain access to a secured server simply because
the client says they want to authenticate via SIMPLE would be very bad. A
properly secured server should reject such shenanigans. But the fix in that
case would be in the authentication handshake and not in preventing the UGI
from being created in the first place. We cannot control the code an untrusted
client is using.
I don't think it's directly harmful to create a UGI with no credentials even if
the caller is not an official proxy user. It can be useful for simply setting
up a user with no initial credentials and then later attaching credentials
(e.g.: security tokens) as is done in the YARN container localizer, log
aggregator, etc. Those are cases where the caller is not an official proxy
user.
> UserGroupInformation.createRemoteUser hardcode authentication method to SIMPLE
> ------------------------------------------------------------------------------
>
> Key: HADOOP-15162
> URL: https://issues.apache.org/jira/browse/HADOOP-15162
> Project: Hadoop Common
> Issue Type: Bug
> Components: security
> Reporter: Eric Yang
>
> {{UserGroupInformation.createRemoteUser(String user)}} is hard coded
> Authentication method to SIMPLE by HADOOP-10683. This by passed proxyuser
> ACL check, isSecurityEnabled check, and allow caller to impersonate as
> anyone. This method could be abused in the main code base, which can cause
> part of Hadoop to become insecure without proxyuser check for both SIMPLE or
> Kerberos enabled environment.
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