Project

General

Profile

TracFineGrainedPermissions » History » Version 1

Anonymous, 04/18/2009 07:09 PM

1 1
= Fine grained permissions =
2
3
Before Trac 0.11, it was only possible to define fine-grained permissions checks on the repository browser sub-system.
4
5
Since 0.11, there's a general mechanism in place that allows custom permission policy plugins to grant or deny any action on any kind of Trac resources, even at the level of specific versions of such resources.
6
7
== Permission Policies ==
8
9
=== !AuthzPolicy ===
10
11
An example policy based on an Authz-style system has been added. See
12
[trac:source:branches/0.11-stable/sample-plugins/permissions/authz_policy.py authz_policy.py] for details (current version requires >= Python 2.4). (See also [trac:source:branches/0.11-stable/sample-plugins/permissions sample-plugins/permissions] for more samples.)
13
14
 - Install [http://www.voidspace.org.uk/python/configobj.html ConfigObj] (required).
15
 - Copy authz_policy.py into your plugins directory.
16
 - 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.
17
 - Update your `trac.ini`:
18
{{{
19
[trac]
20
...
21
permission_policies = AuthzPolicy, DefaultPermissionPolicy, LegacyAttachmentPolicy
22
23
[authz_policy]
24
authz_file = /some/trac/env/conf/authzpolicy.conf
25
26
[components]
27
...
28
authz_policy = enabled
29
}}}
30
31
Note that the order in which permission policies are specified is quite critical, 
32
as policies will be examined in the sequence provided.
33
34
A policy will return either `True`, `False` or `None` for a given permission check.
35
Only if the return value is `None` will the ''next'' permission policy be consulted.
36
If no policy explicitly grants the permission, the final result will be `False` 
37
(i.e. no permission).
38
39
For example, if the `authz_file` contains:
40
{{{
41
[wiki:WikiStart@*]
42
* = WIKI_VIEW
43
44
[wiki:PrivatePage@*]
45
john = WIKI_VIEW
46
* =
47
}}}
48
and the default permissions are set like this:
49
{{{
50
john           WIKI_VIEW
51
jack           WIKI_VIEW
52
# anonymous has no WIKI_VIEW
53
}}}
54
55
Then: 
56
 - All versions of WikiStart will be viewable by everybody (including anonymous)
57
 - !PrivatePage will be viewable only by john
58
 - other pages will be viewable only by john and jack
59
60
61
=== mod_authz_svn-like permission policy ===
62
63
At the time of this writing, the old fine grained permissions system from Trac 0.10 and before used for restricting access to the repository has not yet been converted to a permission policy component, but from the user point of view, this makes little if no difference.
64
65
That kind of fine-grained permission control needs a definition file, which is the one used by Subversion's mod_authz_svn. 
66
More information about this file format and about its usage in Subversion is available in the [http://svnbook.red-bean.com/svnbook/book.html#svn-ch-6-sect-4.4.2 Subversion Book (Per-Directory Access Control)].
67
68
Example:
69
{{{
70
[/]
71
* = r
72
73
[/branches/calc/bug-142]
74
harry = rw
75
sally = r
76
77
[/branches/calc/bug-142/secret]
78
harry =
79
}}}
80
81
 * '''/''' = ''Everyone has read access by default''
82
 * '''/branches/calc/bug-142''' = ''harry has read/write access, sally read only''
83
 * '''/branches/calc/bug-142/secret''' = ''harry has no access, sally has read access (inherited as a sub folder permission)''
84
85
==== Trac Configuration ====
86
87
To activate fine grained permissions you __must__ specify the {{{authz_file}}} option in the {{{[trac]}}} section of trac.ini. If this option is set to null or not specified the permissions will not be used.
88
89
{{{
90
[trac]
91
authz_file = /path/to/svnaccessfile
92
}}}
93
94
if you want to support the use of the `[`''modulename''`:/`''some''`/`''path''`]` syntax within the `authz_file`, add 
95
96
{{{
97
authz_module_name = modulename
98
}}}
99
100
where ''modulename'' refers to the same repository indicated by the `repository_dir` entry in the `[trac]` section.
101
102
'''Note:''' Usernames inside the Authz file __must__ be the same as those used inside trac. 
103
104
==== Subversion Configuration ====
105
106
The same access file is typically applied to the corresponding Subversion repository using an Apache directive like this:
107
{{{
108
<Location /repos>
109
  DAV svn
110
  SVNParentPath /usr/local/svn
111
112
  # our access control policy
113
  AuthzSVNAccessFile /path/to/svnaccessfile
114
</Location>
115
}}}
116
117
For information about how to restrict access to entire projects in a multiple project environment see [trac:wiki:TracMultipleProjectsSVNAccess]
118
119
== Getting TracFineGrainedPermissions to work ==
120
121
Don't forget to restart Trac engine to apply new configuration if you are running tracd standalone server.
122
123
----
124
See also: TracPermissions
125
http://trac-hacks.org/wiki/FineGrainedPageAuthzEditorPlugin for a simple editor plugin.