Tianyin Xu created HDFS-10422:
---------------------------------
Summary: Do not throw AccessControlException for
{{security.hdfs.unreadable.by.superuser}} ops
Key: HDFS-10422
URL: https://issues.apache.org/jira/browse/HDFS-10422
Project: Hadoop HDFS
Issue Type: Bug
Components: namenode
Affects Versions: 2.7.2
Reporter: Tianyin Xu
The xattr {{security.hdfs.unreadable.by.superuser}} has certain syntax rules:
"this xattr is also write-once, and cannot be removed once set. This xattr does
not allow a value to be set."
[https://hadoop.apache.org/docs/r2.7.2/hadoop-project-dist/hadoop-hdfs/ExtendedAttributes.html]
Upon violation, the system should throw {{IllegalArgumentException}}, the same
behaviour like the other xattrs such as {{raw.hdfs.crypto.encryption.zone}}.
Currently, it always throws {{AccessControlException}} which is supposed to be
something related to access control. The only case {{AccessControlException}}
should be thrown is when the superuser tries to access the file, but *not*
anything else.
If the user set any value, it violates the syntax of the xattr (this xattr does
not need values) which has nothing to do with access control:
{code:title=XAttrPermissionFilter.java|borderStyle=solid}
if (XAttrHelper.getPrefixedName(xAttr).
equals(SECURITY_XATTR_UNREADABLE_BY_SUPERUSER)) {
if (xAttr.getValue() != null) {
throw new AccessControlException("Attempt to set a value for '" +
SECURITY_XATTR_UNREADABLE_BY_SUPERUSER +
"'. Values are not allowed for this xattr.");
}
return;
}
{code}
\\
Similarly, if the user wants to remove the xattr, it should throw
{{IllegalArgumentException}} just like the encryption xattr in the following
code. Basically I don't understand why the encryption xattr throws an
{{IllegalArgumentException}} (via the {{checkArgument}} call) but the
{{security.hdfs.unreadable.by.superuser}} xattr throws an
{{AccessControlException}}. It's the same thing here: both of them cannot be
removed...
{code:title=XAttrPermissionFilter.java|borderStyle=solid}
Preconditions.checkArgument(
!KEYID_XATTR.equalsIgnoreValue(filter),
"The encryption zone xattr should never be deleted.");
if (UNREADABLE_BY_SUPERUSER_XATTR.equalsIgnoreValue(filter)) {
throw new AccessControlException("The xattr '" +
SECURITY_XATTR_UNREADABLE_BY_SUPERUSER + "' can not be deleted.");
}
{code}
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