1IDMAP_AUTORID(8) System Administration tools IDMAP_AUTORID(8)
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6 idmap_autorid - Samba's idmap_autorid Backend for Winbind
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9 The idmap_autorid backend provides a way to use an algorithmic mapping
10 scheme to map UIDs/GIDs and SIDs that is more deterministic than
11 idmap_tdb and easier to configure than idmap_rid.
12 The module works similar to idmap_rid, but it automatically configures
14 the range to be used for each domain, so there is no need to specify a
15 specific range for each domain in the forest, the only configuration
16 that is needed is the range of uid/gids that shall be used for
17 user/group mappings and an optional size of the ranges to be used.
18 The mappings of which domain is mapped to which range is stored in
20 autorid.tdb, thus you should backup this database regularly.
21 Due to the algorithm being used, it is the module that is most easy to
23 use as it only requires a minimal configuration.
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26 rangesize = numberofidsperdomain
27 Defines the available number of uids/gids per domain. The minimum
28 needed value is 2000. SIDs with RIDs larger than this value cannot
29 be mapped, are ignored and the corresponding map is discarded.
30 Choose this value carefully, as this should not be changed after
31 the first ranges for domains have been defined, otherwise mappings
32 between domains will get intermixed leading to unpredictable
33 results. Please note that RIDs in Windows Domains usually start
34 with 500 for builtin users and 1000 for regular users. As the
35 parameter cannot be changed later, please plan accordingly for your
36 expected number of users in a domain with safety margins.
37 One range will be used for local users and groups. Thus the number
39 of local users and groups that can be created is limited by this
40 option as well. If you plan to create a large amount of local users
41 or groups, you will need set this parameter accordingly.
42 The default value is 100000.
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46 The Unix ID for a RID is calculated this way:
47 ID = IDMAP UID LOW VALUE + DOMAINRANGENUMBER * RANGESIZE + RID
49 Correspondingly, the formula for calculating the RID for a given Unix
52 ID is this:
53 RID = ID - IDMAP UID LOW VALUE - DOMAINRANGENUMBER * RANGESIZE
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59 This example shows you the minimal configuration that will work for the
60 principial domain and 19 trusted domains.
61 [global]
63 security = ads
64 workgroup = CUSTOMER
65 realm = CUSTOMER.COM
66 idmap config * : backend = autorid
68 idmap config * : range = 1000000-1999999
69 This example shows how to configure idmap_autorid as default for all
73 domains with a potentially large amount of users plus a specific
74 configuration for a trusted domain that uses the SFU mapping scheme.
75 Please note that idmap ranges and sfu ranges are not allowed to
76 overlap.
77 [global]
79 security = ads
80 workgroup = CUSTOMER
81 realm = CUSTOMER.COM
82 idmap config * : backend = autorid
84 idmap config * : range = 1000000-19999999
85 idmap config * : rangesize = 1000000
86 idmap config TRUSTED : backend = ad
88 idmap config TRUSTED : range = 50000 - 99999
89 idmap config TRUSTED : schema_mode = sfu
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93 The original Samba software and related utilities were created by
94 Andrew Tridgell. Samba is now developed by the Samba Team as an Open
95 Source project similar to the way the Linux kernel is developed.
96Samba 3.6 04/11/2016 IDMAP_AUTORID(8)