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SingleSign-On

Questions answered by this recipe

Note: For other single sign-on issues for sharing database logins you may want to see AuthUserDbase.

This section is optional; use it to indicate the types of questions (if any) this recipe is intended to answer.

1. How can Windows-Logon be used for Authentication on pmwiki ?
2. How can Single Sign-On be realized ?
3. Why do DOMAIN-user have to authenticate second time on pmwiki ?
4. Would Authentication against Primary-Domain-Controller be possible ?

Description

This Cookbook describes a solution to realize Single Sign-On with Windows-Clients against Primary-Domain-Controller (Samba). This Cookbook describes a solution to implement Single Sign-On with Windows-Clients against Primary-Domain-Controller (Samba).

A long, but good description of NTLM could be found here.

What's needed ?

1. Server
   1. Webserver which understands NTLM and validate hashes via PDC
      • Windows, IIS or apache2+mod_auth_sspi
      • *nix, apache+mod_ntlm and samba/winbindd
   2. some small adjustments on pmwiki
2. Client
   1. OS which authenticate users against Primary-Domain-Controller
   2. Browser which sends NTLM (I prefer Firefox.)

Server - Windows

• IIS should be play with NTLM out of the box (but is NOT free)!?
• apache(v2.2.3)+mod-auth-sspi
  • extra\mod_auth_sspi.conf:

    <IfModule !mod_auth_sspi.c>
     LoadModule sspi_auth_module modules/mod_auth_sspi.so
    </IfModule>
    
    #
    # Configuration for mod_auth_sspi
    <IfModule mod_auth_sspi.c>
     <Location /protected/>
      AuthName "A Protected Place"
      AuthType SSPI
      SSPIAuth On
      SSPIAuthoritative On
      SSPIOfferBasic On
      #SSPIBasicPreferred On
      #SSPIDomain MYDOMAIN
      SSPIOmitDomain On
      #SSPIUsernameCase On
      require valid-user
     </Location>
    </IfModule>
    
    

Server - *nix

• download, configure, compile apache+mod_ntlm
  • httpd.conf:

    LoadModule auth_ntlm_winbind_module lib/apache/mod_auth_ntlm_winbind.so
    
    User nobody
    Group winbindd # is needed to access /var/run/samba/winbindd_privileged
    
    <Directory "/var/www/htdocs/pmwiki">
     AuthName "NTLM Authentication thingy"
     NTLMAuth on
     NTLMAuthHelper "/usr/bin/ntlm_auth --helper-protocol=squid-2.5-ntlmssp"
     NTLMBasicAuthoritative on
     AuthType NTLM
     require valid-user
    </Directory>
    
    

  • think about ssl
• prepare winbindd for apache+mod_ntml
  • install, configure samba
  • let the server join the domain
    • net rpc join
  • grant apache to access /var/run/samba/winbindd_privileged
    1. groupadd winbindd
    2. chgrp winbindd /var/run/samba/winbindd_privileged
    3. /etc/rc.d/apache restart

pmwiki-config

• local/farmconfig.php or local/config.php

  include_once ("$FarmD/scripts/httpauth.php");//NTLM-Auth, Basic-Auth
  include_once ("$FarmD/scripts/authuser.php");
  if(@$_SERVER['REMOTE_USER']) {
    #remove domainname
    $temp = preg_replace("/^[^\\\]+\\\/", "", @$_SERVER['REMOTE_USER']);
    $_SERVER['REMOTE_USER'] = $temp;
    $Author = $temp; #set Author to REMOTE_USER
    AuthUserId($pagename, stripmagic(@$_SERVER['REMOTE_USER']));#authuser
    #fix-author for editform
    SDVA($InputTags['e_author'], array(
      ':html' => "$Author<input type='hidden' \$InputFormArgs />",
      'name' => 'author', 'value' => $Author));
  }
  
  

Client Preferences

• Firefox Preferences
  1. about:config
  2. network.automatic-ntlm-auth.trusted-uris=yourserver.domain
• Opera Preferences
  1. opera:config
  2. Network->Enable NTLM
• IE Preferences
  1. not used, unknown

Notes

What happens, if browser not support NTLM ?
Fallback Authentication-method is "Basic-Auth", which pop-up the ugly browserwindow, which asks for login and password.
username: DOMAIN\user

Which browsers/plattforms support NTLM ?

• WinXP/Firefox >1.0: works
• WinXP/Opera 9.02: only Basic-Auth (see forum)
• WinXP/IE 6: should work (not tested)
• linux/Firefox 2.0: only Basic-Auth
• linux/Firefox 2.0+NTLM-Proxy: should work (not tested)
• linux/Opera 9.02: FAILED !!" (NTLM featre for Opera seems to be windows-only)

Could Groups defined in AuthUser be used ?

• Yes ! Nothing have to be changed. You can define also global passwords in config.php. See PasswordsAdmin and Passwords.

Release Notes

If the recipe has multiple releases, then release notes can be placed here. Note that it's often easier for people to work with "release dates" instead of "version numbers".

Version 1(20061130)

See Also

• WebServerSecurity for more information about apache-security.
• Cookbook#Security for security-related Cookbooks
• PmWiki.Security for other pages about security.

Contributors

• FalkHamann

Comments