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83 lines
3.4 KiB
Plaintext
83 lines
3.4 KiB
Plaintext
Configuring NFS4 ACLs in Samba3
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===============================
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Created: Peter Somogyi, 2006-JUN-06
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Last modified: Peter Somogyi, 2006-JUL-20
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Revision no.: 4
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-------------------------------
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Parameters in smb.conf:
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=======================
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Each parameter must have a prefix "nfs4:".
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Each one affects the behaviour only when _setting_ an acl on a file/dir:
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mode = [simple|special]
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- simple: don't use OWNER@ and GROUP@ special IDs in ACEs. - default
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- special: use OWNER@ and GROUP@ special IDs in ACEs instead of simple user&group ids.
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Note: EVERYONE@ is always processed (if found such an ACE).
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Note2: special mode will have side effect when _only_ chown is performed. Later this may be worked out.
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Use "simple" mode when the share is used mainly by windows users and unix side is not significant. You will loose unix bits in this case.
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It's strongly advised setting "store dos attributes = yes" in smb.conf.
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chown = [true|false]
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- true => enable changing owner and group - default.
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- false => disable support for changing owner or group
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acedup = [dontcare|reject|ignore|merge]
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- dontcare: copy ACEs as they come, don't care with "duplicate" records. Default.
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- reject: stop operation, exit acl setter operation with an error
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- ignore: don't include the second matching ACE
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- merge: OR 2 ace.flag fields and 2 ace.mask fields of the 2 duplicate ACEs into 1 ACE
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Two ACEs are considered here "duplicate" when their type and id fields are matching.
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Example:
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[smbtest]
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path = /tests/psomogyi/smbtest
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writable = yes
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vfs objects = aixacl2
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nfs4: mode = special
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nfs4: chown = yes
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nfs4: acedup = merge
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Configuring AIX ACL support
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==============================
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Binaries: (default install path is [samba]/lib/vfs/)
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- aixacl.so: provides AIXC ACL support only, can be compiled and works on all AIX platforms
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- aixacl2.so: provides AIXC and JFS2-NFS4 ACL support, can be compiled and works only under AIX 5.3 and newer.
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NFS4 acl currently has support only under JFS2 (ext. attr. format must be set to v2).
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aixacl2.so always detects support for NFS4 acls and redirects to POSIX ACL handling automatically when NFS4 is not supported for a path.
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Adding "vfs objects = aixacl2" to a share should be done only in case when NFS4 is really supported by the filesystem.
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(Otherwise you may get performance loss.)
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For configuration see also the example above.
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General notes
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=============
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NFS4 handling logic is separated from AIX/jfs2 ACL parsing.
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Samba and its VFS modules dosn't reorder ACEs. Windows clients do that (and the smbcacl tool). MSDN also says deny ACEs must come first.
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NFS4 ACL's validity is checked by the system API, not by Samba.
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NFS4 ACL rights are enforced by the OS or filesystem, not by Samba.
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The flag INHERITED_ACE is never set (not required, as doesn't do WinNT/98/me, only since Win2k).
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Win2k GUI behaves strangely when detecting inheritance (sometimes it doesn't detect,
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but after adding an ace it shows that - it's some GUI error).
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Unknown (unmappable) SIDs are not accepted.
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TODOs
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=====
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- Creator Owner & Group SID handling (same way as posix)
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- the 4 generic rights bits support (GENERIC_RIGHT_READ_ACCESS, WRITE, EXEC, ALL)
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- chown & no ACL, but we have ONWER@ and GROUP@
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- DIALUP, ANONYMOUS, ... builtin SIDs
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- audit & alarm support - in theory it's forwarded so it should work, but currently there's no platform which supports them to test
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- support for a real NFS4 client (we don't have an accepted API yet)
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