Changes between Version 3 and Version 4 of TracFineGrainedPermissions


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Timestamp:
Nov 17, 2014, 9:39:05 PM (10 years ago)
Author:
trac
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  • TracFineGrainedPermissions

    v3 v4  
     1[[PageOutline(2-5, Contents, floated)]]
    12= Fine grained permissions =
    23
    … …  
    1617{{{
    1718[trac]
    18 permission_policies = AuthzSourcePolicy, DefaultPermissionPolicy, LegacyAttachmentPolicy
    19 }}}
    20 This lists the [#AuthzSourcePolicy] described below as the first policy, followed by the !DefaultPermissionPolicy which checks for the traditional coarse grained style permissions described in TracPermissions, and the !LegacyAttachmentPolicy which knows how to use the coarse grained permissions for checking the permissions available on attachments.
     19permission_policies = ReadonlyWikiPolicy, DefaultPermissionPolicy, LegacyAttachmentPolicy
     20}}}
     21This lists the [#ReadonlyWikiPolicy] which controls readonly access to wiki pages, followed by the !DefaultPermissionPolicy which checks for the traditional coarse grained style permissions described in TracPermissions, and the !LegacyAttachmentPolicy which knows how to use the coarse grained permissions for checking the permissions available on attachments.
    2122
    2223Among the possible optional choices, there is [#AuthzPolicy], a very generic permission policy, based on an Authz-style system. See
    … …  
    2930
    3031=== !AuthzPolicy ===
    31 
    32  - Install [http://www.voidspace.org.uk/python/configobj.html ConfigObj] (required).
    33  - Copy authz_policy.py into your plugins directory.
    34  - Put a [http://swapoff.org/files/authzpolicy.conf authzpolicy.conf] file somewhere, preferably on a secured location on the server, not readable for others than the webuser. If the  file contains non-ASCII characters, the UTF-8 encoding should be used.
    35  - Update your `trac.ini`:
    36    1. modify the [TracIni#trac-section permission_policies] entry in the `[trac]` section
     32==== Configuration ====
     33* Install [http://www.voidspace.org.uk/python/configobj.html ConfigObj] (still needed for 0.12 and later).
     34* Copy [browser:/trunk/tracopt/perm/authz_policy.py /tracopt/perm/authz_policy.py] to your environment's plugins directory (only for Trac 0.11).
     35* Put a [http://swapoff.org/files/authzpolicy.conf authzpolicy.conf] file somewhere, preferably on a secured location on the server, not readable for others than the webuser. If the  file contains non-ASCII characters, the UTF-8 encoding should be used.
     36* Update your `trac.ini`:
     37  1. modify the [TracIni#trac-section permission_policies] entry in the `[trac]` section
    3738{{{
    3839[trac]
    3940...
    40 permission_policies = AuthzPolicy, DefaultPermissionPolicy, LegacyAttachmentPolicy
    41 }}}
    42    2. add a new `[authz_policy]` section
     41permission_policies = AuthzPolicy, ReadonlyWikiPolicy, DefaultPermissionPolicy, LegacyAttachmentPolicy
     42}}}
     43  1. add a new `[authz_policy]` section
    4344{{{
    4445[authz_policy]
    4546authz_file = /some/trac/env/conf/authzpolicy.conf
    4647}}}
    47    3. enable the single file plugin
     48  1. enable the plugin through [/admin/general/plugin WebAdmin] or by editing the `[components]` section
    4849{{{
    4950[components]
    … …  
    5556}}}
    5657
     58
     59==== Usage Notes ====
    5760Note that the order in which permission policies are specified is quite critical,
    5861as policies will be examined in the sequence provided.
    5962
    60 A policy will return either `True`, `False` or `None` for a given permission check.
    61 Only if the return value is `None` will the ''next'' permission policy be consulted.
    62 If no policy explicitly grants the permission, the final result will be `False`
    63 (i.e. no permission).
     63A policy will return either `True`, `False` or `None` for a given permission check. `True` is returned if the policy explicitly grants the permission. `False` is returned if the policy explicitly denies the permission. `None` is returned if the policy is unable to either grant or deny the permission.
     64
     65NOTE: Only if the return value is `None` will the ''next'' permission policy be consulted.
     66If none of the policies explicitly grants the permission, the final result will be `False`
     67(i.e. permission denied).
     68
     69The `authzpolicy.conf` file is a `.ini` style configuration file:
     70{{{
     71[wiki:PrivatePage@*]
     72john = WIKI_VIEW, !WIKI_MODIFY
     73jack = WIKI_VIEW
     74* =
     75}}}
     76* Each section of the config is a glob pattern used to match against a Trac resource
     77  descriptor. These descriptors are in the form:
     78{{{
     79<realm>:<id>@<version>[/<realm>:<id>@<version> ...]
     80}}}
     81  Resources are ordered left to right, from parent to child. If any
     82  component is inapplicable, `*` is substituted. If the version pattern is
     83  not specified explicitely, all versions (`@*`) is added implicitly
     84
     85  Example: Match the WikiStart page
     86{{{
     87[wiki:*]
     88[wiki:WikiStart*]
     89[wiki:WikiStart@*]
     90[wiki:WikiStart]
     91}}}
     92
     93  Example: Match the attachment `wiki:WikiStart@117/attachment:FOO.JPG@*`
     94  on WikiStart
     95{{{
     96[wiki:*]
     97[wiki:WikiStart*]
     98[wiki:WikiStart@*]
     99[wiki:WikiStart@*/attachment:*]
     100[wiki:WikiStart@117/attachment:FOO.JPG]
     101}}}
     102
     103* Sections are checked against the current Trac resource descriptor '''IN ORDER''' of
     104  appearance in the configuration file. '''ORDER IS CRITICAL'''.
     105
     106* Once a section matches, the current username is matched against the keys
     107  (usernames) of the section, '''IN ORDER'''.
     108  * If a key (username) is prefixed with a `@`, it is treated as a group.
     109  * If a value (permission) is prefixed with a `!`, the permission is
     110    denied rather than granted.
     111
     112  The username will match any of 'anonymous', 'authenticated', <username> or '*', using normal Trac permission rules. || '''Note:''' Other groups which are created by user (e.g. by 'adding subjects to groups' on web interface page //Admin / Permissions//) cannot be used. See [trac:ticket:5648 #5648] for details about this missing feature ||
    64113
    65114For example, if the `authz_file` contains:
    … …  
    70119[wiki:PrivatePage@*]
    71120john = WIKI_VIEW
    72 * =
     121* = !WIKI_VIEW
    73122}}}
    74123and the default permissions are set like this:
    … …  
    80129
    81130Then:
    82  - All versions of WikiStart will be viewable by everybody (including anonymous)
    83  - !PrivatePage will be viewable only by john
    84  - other pages will be viewable only by john and jack
    85 
     131  * All versions of WikiStart will be viewable by everybody (including anonymous)
     132  * !PrivatePage will be viewable only by john
     133  * other pages will be viewable only by john and jack
     134
     135Groups:
     136{{{
     137[groups]
     138admins = john, jack
     139devs = alice, bob
     140
     141[wiki:Dev@*]
     142@admins = TRAC_ADMIN
     143@devs = WIKI_VIEW
     144* =
     145
     146[*]
     147@admins = TRAC_ADMIN
     148* =
     149}}}
     150
     151Then:
     152- everything is blocked (whitelist approach), but
     153- admins get all TRAC_ADMIN everywhere and
     154- devs can view wiki pages.
     155
     156Some repository examples (Browse Source specific):
     157{{{
     158# A single repository:
     159[repository:test_repo@*]
     160john = BROWSER_VIEW, FILE_VIEW
     161# John has BROWSER_VIEW and FILE_VIEW for the entire test_repo
     162
     163# The default repository (requires Trac 1.0.2 or later):
     164[repository:@*]
     165john = BROWSER_VIEW, FILE_VIEW
     166# John has BROWSER_VIEW and FILE_VIEW for the entire default repository
     167
     168# All repositories:
     169[repository:*@*]
     170jack = BROWSER_VIEW, FILE_VIEW
     171# Jack has BROWSER_VIEW and FILE_VIEW for all repositories
     172}}}
     173
     174Very fine grain repository access:
     175{{{
     176# John has BROWSER_VIEW and FILE_VIEW access to trunk/src/some/location/ only
     177[repository:test_repo@*/source:trunk/src/some/location/*@*]
     178john = BROWSER_VIEW, FILE_VIEW
     179
     180
     181# John has BROWSER_VIEW and FILE_VIEW access to only revision 1 of all files at trunk/src/some/location only
     182[repository:test_repo@*/source:trunk/src/some/location/*@1]
     183john = BROWSER_VIEW, FILE_VIEW
     184
     185
     186# John has BROWSER_VIEW and FILE_VIEW access to all revisions of 'somefile' at trunk/src/some/location only
     187[repository:test_repo@*/source:trunk/src/some/location/somefile@*]
     188john = BROWSER_VIEW, FILE_VIEW
     189
     190
     191# John has BROWSER_VIEW and FILE_VIEW access to only revision 1 of 'somefile' at trunk/src/some/location only
     192[repository:test_repo@*/source:trunk/src/some/location/somefile@1]
     193john = BROWSER_VIEW, FILE_VIEW
     194}}}
     195
     196Note: In order for Timeline to work/visible for John, we must add CHANGESET_VIEW to the above permission list.
     197
     198
     199==== Missing Features ====
     200Although possible with the !DefaultPermissionPolicy handling (see Admin panel), fine-grained permissions still miss those grouping features (see [trac:ticket:9573 #9573], [trac:ticket:5648 #5648]). Patches are partially available, see forgotten authz_policy.2.patch  part of [trac:ticket:6680 #6680]).
     201
     202You cannot do the following:
     203{{{
     204[groups]
     205team1 = a, b, c
     206team2 = d, e, f
     207team3 = g, h, i
     208departmentA = team1, team2
     209}}}
     210
     211Permission groups are not supported either. You cannot do the following:
     212{{{
     213[groups]
     214permission_level_1 = WIKI_VIEW, TICKET_VIEW
     215permission_level_2  = permission_level_1, WIKI_MODIFY, TICKET_MODIFY
     216[*]
     217@team1 = permission_level_1
     218@team2 = permission_level_2
     219@team3 = permission_level_2, TICKET_CREATE
     220}}}
    86221
    87222=== !AuthzSourcePolicy  (mod_authz_svn-like permission policy) === #AuthzSourcePolicy
    … …  
    142277{{{
    143278[trac]
    144 permission_policies = AuthzSourcePolicy, DefaultPermissionPolicy, LegacyAttachmentPolicy
     279permission_policies = AuthzSourcePolicy, ReadonlyWikiPolicy, DefaultPermissionPolicy, LegacyAttachmentPolicy
    145280}}}
    146281
    … …  
    159294
    160295For information about how to restrict access to entire projects in a multiple project environment see [trac:wiki:TracMultipleProjectsSVNAccess]
     296
     297=== ReadonlyWikiPolicy
     298
     299Since 1.1.2, the read-only attribute of wiki pages is enabled and enforced when `ReadonlyWikiPolicy` is in the list of active permission policies. The default for new Trac installations in 1.1.2 and later is:
     300{{{
     301[trac]
     302permission_policies = ReadonlyWikiPolicy,
     303 DefaultPermissionPolicy,
     304 LegacyAttachmentPolicy
     305}}}
     306
     307When upgrading from earlier versions of Trac, `ReadonlyWikiPolicy` will be appended to the list of `permission_policies` when upgrading the environment, provided that `permission_policies` has the default value. If any non-default `permission_polices` are active, `ReadonlyWikiPolicy` **will need to be manually added** to the list. A message will be echoed to the console when upgrading the environment, indicating if any action needs to be taken.
     308
     309**!ReadonlyWikiPolicy must be listed //before// !DefaultPermissionPolicy**. The latter returns `True` to allow modify, delete or rename actions when the user has the respective `WIKI_*` permission, without consideration for the read-only attribute.
     310
     311The `ReadonlyWikiPolicy` returns `False` to deny modify, delete and rename actions on wiki pages when the page has the read-only attribute set and the user does not have `WIKI_ADMIN`, regardless of `WIKI_MODIFY`, `WIKI_DELETE` and `WIKI_RENAME` permissions. It returns `None` for all other cases.
     312
     313When active, the [#AuthzPolicy] should therefore come before `ReadonlyWikiPolicy`, allowing it to grant or deny the actions on individual resources, which is the usual ordering for `AuthzPolicy` in the `permission_policies` list.
     314{{{
     315[trac]
     316permission_policies = AuthzPolicy,
     317 ReadonlyWikiPolicy,
     318 DefaultPermissionPolicy,
     319 LegacyAttachmentPolicy
     320}}}
     321
     322The placement of [#AuthzSourcePolicy] relative to `ReadonlyWikiPolicy` does not matter since they don't perform checks on the same realms.
     323
     324For all other permission policies, the user will need to decide the proper ordering. Generally, if the permission policy should be capable of overriding the check performed by `ReadonlyWikiPolicy`, it should come before `ReadonlyWikiPolicy` in the list. If the `ReadonlyWikiPolicy` should override the check performed by another permission policy, as is the case for `DefaultPermissionPolicy`, then `ReadonlyWikiPolicy` should come first.
    161325
    162326== Debugging permissions
    … …  
    176340to understand what checks are being performed. See the sourced documentation of the plugin for more info.
    177341
    178 
    179342----
    180343See also: TracPermissions,