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Date: Tue, 6 Sep 2016 18:22:22 +0000 (UTC)
From: "John Zhuge (JIRA)" <jira@apache.org>
To: hdfs-issues@hadoop.apache.org
Message-ID: <JIRA.12737492.1409243502000.499767.1473186142188@Atlassian.JIRA>
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References: <JIRA.12737492.1409243502000@Atlassian.JIRA> <JIRA.12737492.1409243502334@arcas>
Subject: [jira] [Commented] (HDFS-6962) ACL inheritance conflicts with
 umaskmode
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archived-at: Tue, 06 Sep 2016 18:22:24 -0000


    [ https://issues.apache.org/jira/browse/HDFS-6962?page=3Dcom.atlassian.=
jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=3D15468=
117#comment-15468117 ]=20

John Zhuge commented on HDFS-6962:
----------------------------------

Thank you [~eddyxu] and [~cnauroth] for the great reviews and commit, [~Ale=
xandre LINTE] for reporting the issue.

> ACL inheritance conflicts with umaskmode
> ----------------------------------------
>
>                 Key: HDFS-6962
>                 URL: https://issues.apache.org/jira/browse/HDFS-6962
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: security
>    Affects Versions: 2.4.1
>         Environment: CentOS release 6.5 (Final)
>            Reporter: LINTE
>            Assignee: John Zhuge
>            Priority: Critical
>              Labels: hadoop, security
>             Fix For: 3.0.0-alpha2
>
>         Attachments: HDFS-6962.001.patch, HDFS-6962.002.patch, HDFS-6962.=
003.patch, HDFS-6962.004.patch, HDFS-6962.005.patch, HDFS-6962.006.patch, H=
DFS-6962.007.patch, HDFS-6962.008.patch, HDFS-6962.009.patch, HDFS-6962.010=
.patch, HDFS-6962.1.patch, disabled_new_client.log, disabled_old_client.log=
, enabled_new_client.log, enabled_old_client.log, run_compat_tests, run_uni=
t_tests, test_plan.md
>
>
> In hdfs-site.xml=20
> <property>
>     <name>dfs.umaskmode</name>
>     <value>027</value>
> </property>
> 1/ Create a directory as superuser
> bash# hdfs dfs -mkdir  /tmp/ACLS
> 2/ set default ACLs on this directory rwx access for group readwrite and =
user toto
> bash# hdfs dfs -setfacl -m default:group:readwrite:rwx /tmp/ACLS
> bash# hdfs dfs -setfacl -m default:user:toto:rwx /tmp/ACLS
> 3/ check ACLs /tmp/ACLS/
> bash# hdfs dfs -getfacl /tmp/ACLS/
> # file: /tmp/ACLS
> # owner: hdfs
> # group: hadoop
> user::rwx
> group::r-x
> other::---
> default:user::rwx
> default:user:toto:rwx
> default:group::r-x
> default:group:readwrite:rwx
> default:mask::rwx
> default:other::---
> user::rwx | group::r-x | other::--- matches with the umaskmode defined in=
 hdfs-site.xml, everything ok !
> default:group:readwrite:rwx allow readwrite group with rwx access for inh=
=C3=A9ritance.
> default:user:toto:rwx allow toto user with rwx access for inh=C3=A9ritanc=
e.
> default:mask::rwx inh=C3=A9ritance mask is rwx, so no mask
> 4/ Create a subdir to test inheritance of ACL
> bash# hdfs dfs -mkdir  /tmp/ACLS/hdfs
> 5/ check ACLs /tmp/ACLS/hdfs
> bash# hdfs dfs -getfacl /tmp/ACLS/hdfs
> # file: /tmp/ACLS/hdfs
> # owner: hdfs
> # group: hadoop
> user::rwx
> user:toto:rwx   #effective:r-x
> group::r-x
> group:readwrite:rwx     #effective:r-x
> mask::r-x
> other::---
> default:user::rwx
> default:user:toto:rwx
> default:group::r-x
> default:group:readwrite:rwx
> default:mask::rwx
> default:other::---
> Here we can see that the readwrite group has rwx ACL bu only r-x is effec=
tive because the mask is r-x (mask::r-x) in spite of default mask for inher=
itance is set to default:mask::rwx on /tmp/ACLS/
> 6/ Modifiy hdfs-site.xml et restart namenode
> <property>
>     <name>dfs.umaskmode</name>
>     <value>010</value>
> </property>
> 7/ Create a subdir to test inheritance of ACL with new parameter umaskmod=
e
> bash# hdfs dfs -mkdir  /tmp/ACLS/hdfs2
> 8/ Check ACL on /tmp/ACLS/hdfs2
> bash# hdfs dfs -getfacl /tmp/ACLS/hdfs2
> # file: /tmp/ACLS/hdfs2
> # owner: hdfs
> # group: hadoop
> user::rwx
> user:toto:rwx   #effective:rw-
> group::r-x      #effective:r--
> group:readwrite:rwx     #effective:rw-
> mask::rw-
> other::---
> default:user::rwx
> default:user:toto:rwx
> default:group::r-x
> default:group:readwrite:rwx
> default:mask::rwx
> default:other::---
> So HDFS masks the ACL value (user, group and other  -- exepted the POSIX =
owner -- ) with the group mask of dfs.umaskmode properties when creating di=
rectory with inherited ACL.



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