1IDMAP_TDB2(8)             System Administration tools            IDMAP_TDB2(8)
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NAME

6       idmap_tdb2 - Samba´s idmap_tdb2 Backend for Winbind
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DESCRIPTION

9       The idmap_tdb2 plugin is a substitute for the default idmap_tdb backend
10       used by winbindd for storing SID/uid/gid mapping tables in clustered
11       environments with Samba and CTDB.
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13       In contrast to read only backends like idmap_rid, it is an allocating
14       backend: This means that it needs to allocate new user and group IDs in
15       order to create new mappings. The allocator can be provided by the
16       idmap_tdb2 backend itself or by any other allocating backend like
17       idmap_tdb or idmap_ldap. This is configured with the parameter idmap
18       alloc backend.
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20       Note that in order for this (or any other allocating) backend to
21       function at all, the default backend needs to be writeable. The ranges
22       used for uid and gid allocation are the default ranges configured by
23       "idmap uid" and "idmap gid".
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25       Furthermore, since there is only one global allocating backend
26       responsible for all domains using writeable idmap backends, any
27       explicitly configured domain with idmap backend tdb2 should have the
28       same range as the default range, since it needs to use the global uid /
29       gid allocator. See the example below.
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IDMAP OPTIONS

32       range = low - high
33           Defines the available matching uid and gid range for which the
34           backend is authoritative. If the parameter is absent, Winbind fails
35           over to use the "idmap uid" and "idmap gid" options from smb.conf.
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IDMAP SCRIPT

38       The tdb2 idmap backend supports a script for performing id mappings
39       through the smb.conf option idmap : script. The script should accept
40       the following command line options.
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42                SIDTOID S-1-xxxx
43                IDTOSID UID xxxx
44                IDTOSID GID xxxx
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47       And it should return one of the following responses as a single line of
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50                UID:yyyy
51                GID:yyyy
52                SID:yyyy
53                ERR:yyyy
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56       Note that the script should cover the complete range of SIDs that can
57       be passed in for SID to Unix ID mapping, since otherwise SIDs unmapped
58       by the script might get mapped to IDs that had previously been mapped
59       by the script.
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EXAMPLES

62       This example shows how tdb2 is used as a the default idmap backend. It
63       configures the idmap range through the global options for all domains
64       encountered. This same range is used for uid/gid allocation.
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66                [global]
67                idmap backend = tdb2
68                idmap uid = 1000000-2000000
69                idmap gid = 1000000-2000000
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AUTHOR

73       The original Samba software and related utilities were created by
74       Andrew Tridgell. Samba is now developed by the Samba Team as an Open
75       Source project similar to the way the Linux kernel is developed.
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79Samba 3.5                         08/02/2011                     IDMAP_TDB2(8)
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