Difference: TWikiAccessControl (3 vs. 4)

Revision 421 Jan 2001 - Main.PeterThoeny

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TWiki allows to define some restrictions of who is allowed to make changes and attach files to topics.
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TWiki allows you to define restrictions of who is allowed to view a TWiki web, make changes to topics or attach files.
 
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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:
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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.
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  • 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.
        * Set ALLOWTOPICCHANGE = Main.TWikiAdminGroup
    for the TWikiAdminGroup topic. (This is to prevent users not in the group from editing the topic and gaining unauthorized membership to the group.)
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Access Control for Individual Topics
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Write Access Restriction for Individual Topics
 
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You can define some restrictions of who is allowed to make changes and attach files to a topic.
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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:
  • Set DENYTOPICCHANGE = < list of users and groups >
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 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.
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Access Control per TWiki Web
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Write Access Restriction for a Whole TWiki Web
 
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You can define some restrictions of who is allowed to make changes and attach files to topics or create new topics in a TWiki web.
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You can define restrictions of who is allowed to make changes to a TWiki web. This includes creating new topics, changing topics or attaching files.
 Define one or both of these variable in the WebPreferences topic:
  • Set DENYWEBCHANGE = < list of users and groups >
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  • DENYTOPICCHANGE (in topic) overrides DENYWEBCHANGE (in WebPreferences)
  • ALLOWTOPICCHANGE (in topic) overrides ALLOWWEBCHANGE (in WebPreferences)
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Read Access Restriction for a Whole TWiki Web

You can define restrictions of who is allowed to view a TWiki 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:

  • 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
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-- PeterThoeny? - 28 Oct 2000
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-- PeterThoeny? - 20 Jan 2001
 
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