-%WIKITOOLNAME% allows to define some restrictions of who is allowed to make changes and attach files to topics.
+## <a name="TWiki Access Control"></a> TWiki Access Control
-**IMPORTANT NOTE:** Think twice before restricting write access to a web or a topic, because an open system where everybody can contribute is the essence of the [[WikiCulture]]. Experience shows that unrestricted write access works very well because:
+%WIKITOOLNAME% allows you to define restrictions of who is allowed to view a %WIKITOOLNAME% web, make changes to topics or attach files.
+
+**IMPORTANT NOTE:** Think twice before restricting read or write access to a web or a topic, because an open system where everybody can contribute is the essence of the [[WikiCulture]]. Experience shows that unrestricted write access works very well because:
- There is enough peer pressure to post only conform content.
- Content does not get lost because topics are under revision control.
- A topic revision can be undone by a member of the [[TWikiAdminGroup]] in case needed.
-**_Users and Groups_**
+### <a name="Users and Groups"></a> Users and Groups
Access control is based on users and groups.
- GROUP defines the members of the group; it is a comma delimited list of users and other groups. Example: <br />` * Set GROUP = Main.SomeUser, Main.OtherUser, Main.SomeOtherGroup`
- ALLOWTOPICCHANGE defines who is allowed to change the group topic; it is a comma delimited list of users and groups. You typically want to restrict that to the members of the group itself, so it should contain the name of the topic, i.e. <br />` * Set ALLOWTOPICCHANGE = Main.TWikiAdminGroup`<br /> for the TWikiAdminGroup topic. (This is to prevent users not in the group from editing the topic and gaining unauthorized membership to the group.)
-**_Access Control for Individual Topics_**
+### <a name="Write Access Restriction for Ind"></a> Write Access Restriction for Individual Topics
-You can define some restrictions of who is allowed to make changes and attach files to a topic.
+You can define restrictions of who is allowed to make changes to a topic or attach files to it.
Define one or both of these variables in a topic, preferably at the end of the topic:
DENYTOPICCHANGE is evaluated before ALLOWTOPICCHANGE. Access is denied if the authenticated person is in the DENYTOPICCHANGE list, or not in the ALLOWTOPICCHANGE list. Access is granted in case DENYTOPICCHANGE and ALLOWTOPICCHANGE is not defined.
-**_Access Control per %WIKITOOLNAME% Web_**
+### <a name="Write Access Restriction for a W"></a> Write Access Restriction for a Whole %WIKITOOLNAME% Web
-You can define some restrictions of who is allowed to make changes and attach files to topics or create new topics in a %WIKITOOLNAME% web.
+You can define restrictions of who is allowed to make changes to a %WIKITOOLNAME% web. This includes creating new topics, changing topics or attaching files.
Define one or both of these variable in the [[WebPreferences]] topic:
- DENYTOPICCHANGE (in topic) overrides DENYWEBCHANGE (in WebPreferences)
- ALLOWTOPICCHANGE (in topic) overrides ALLOWWEBCHANGE (in WebPreferences)
+### <a name="Read Access Restriction for a Wh"></a> Read Access Restriction for a Whole %WIKITOOLNAME% Web
+
+You can define restrictions of who is allowed to view a %WIKITOOLNAME% web.
+
+Define one or both of these variable in the [[WebPreferences]] topic:
+
+- Set DENYWEBVIEW = < list of users and groups >
+- Set ALLOWWEBVIEW = < list of users and groups >
+
+_Notes for read access restriction:_
+
+- The view restriction is not suitable for very sensitive content since there is a way to circumvent the read access restriction.
+- Read access restriction only works if the view script is authenticated, that means that users need to log on also just to read topics. [TWiki Installation](TWikiDocumentation#installation) has more on basic authentication based on the `.htaccess` file.
+- There is a workaround if you prefer to to have unrestricted access to view topics located in normal webs, and to authenticate users only for webs where view restriction is enabled:
+ - Leave the `view` script non authenticated in the `.htaccess` file.
+ - Enable the `$doRememberRemoteUser` flag in `wikicfg.pm` as described in [TWiki Authentication](TWikiDocumentation#authentication). %WIKITOOLNAME% will now remember the IP address of an authenticated user.
+ - Copy the `view` script to `viewauth` (or better, create a symbolic link)
+ - Add `viewauth` to the list of authenticated scripts in the .htaccess file.
+ - When a user accesses a web where you enabled view restriction, %WIKITOOLNAME% will redirect from the `view` script to the `viewauth` script once (this hapens only if the user has never edited a topic). Doing so will ask for authentication. The `viewauth` script shows the requested topic if the user could log on and if the user is authorized to see that web.
+- If you enable view restriction for a web, it is recommended to restrict search "all webs" from searching this web. Enable this restriction with the `NOSEARCHALL` variable in its [[WebPreferences]], like:
+ - Set NOSEARCHALL = on
+- It is not recommended to restrict view access to individual topics since all content is searchable **_within_** a web.
+- The view restriction is not suitable for very sensitive content since there is a way to circumvent the read access restriction.
+
**_Related topics:_** [[TWikiPreferences]], [[WebPreferences]] (in every web), [[TWikiAdminGroup]], [[TWikiGroups]]
--- [[PeterThoeny]] - 28 Oct 2000 <br />
+-- [[PeterThoeny]] - 16 Mar 2001 <br />
git://git.openafs.org / openafs-wiki.git / blobdiff