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       squid_ldap_auth  -b  "base  DN"  [-u  attribute] [options]

       squid_ldap_auth -b  "base  DN"  -f  "LDAP  search  filter"
       [options] [ldap_server_name[:port]...]


       This helper allows Squid to connect to a LDAP directory to
       validate the user name and password of Basic HTTP  authen­

       The  program  has  two  major  modes  of operation. In the
       default mode of operation  the  users  DN  is  constructed
       using the base DN and user attribute. In the other mode of
       operation a search filter is used  to  locate  valid  user
       DN's below the base DN.

       -b basedn (REQUIRED)
              Specifies  the  base  DN  under which the users are

       -f filter
              LDAP search filter to locate the user DN.  Required
              if  the users are in a hierarchy below the base DN,
              or if the login name is not what  builds  the  user
              specific part of the users DN.

              The  search filter can contain up to 15 occurrences
              of %s which will be replaced by the username, as in
              "uid=%s"  for  RFC2037  directories. For a detailed
              description  of  LDAP  search  filter  syntax   see

       -u userattr
              Specifies  the  name  of the DN attribute that con­
              tains the username/login.  Combined with  the  base
              DN  to construct the users DN when no search filter
              is specified (-f option). Defaults to 'uid'

              Note: This can only be done if all your  users  are
              located  directly  under  the  same position in the
              LDAP tree and the login name  is  used  for  naming
              each  user object. If your LDAP tree does not match
              these criterias or if you want to  filter  who  are
              valid users then you need to use a search filter to
              search for your users DN (-f option).

       -s base|one|sub
              search scope when performing user DN searches spec­
              ified by the -f option. Defaults to 'sub'.

       -D binddn -W secretfile
              The  DN and the name of a file containing the pass­
              word to bind as while performing searches.

              Less insecure version of the former parameter  pair
              with two advantages: The password does not occur in
              the process listing, and the password is not  being
              compromised if someone gets the squid configuration
              file without getting the secretfile.

       -P     Use a persistent LDAP connection. Normally the LDAP
              connection is only open while validating a username
              to preserve resources  at  the  LDAP  server.  This
              option  causes the LDAP connection to be kept open,
              allowing it to be reused for further  user  valida­
              tions. Recommended for larger installations.

       -R     do not follow referrals

       -a never|always|search|find
              when to dereference aliases. Defaults to 'never'

              never  dereference aliases (default), always deref­
              erence aliases, only while  searching  or  only  to
              find the base object

       -H ldapuri
              Specity  the  LDAP server to connect to by LDAP URI
              (requires OpenLDAP libraries)

       -h ldapserver
              Specify the LDAP server to connect to

       -p ldapport
              Specify an alternate TCP port where the ldap server
              is  listening  if  other than the default LDAP port

       -Z     Use TLS encryption

              Enable LDAP over SSL (requires  Netscape  LDAP  API

              Specify   timeout  used  when  connecting  to  LDAP
              servers (requires Netscape LDAP API libraries)

              Specify time limit on LDAP search operations


       And  similarily  if you only want to allow access to users
       having a specific attribute

              squid_ldap_auth     -b     dc=your,dc=domain     -f
              (&(uid=%s)(specialattribute=value)) ldapserver

       Or if the user attribute of the user DN is "cn" instead of
       "uid" and you do not want to have to search for the  users
       then  you  could  use something like the following example
       for Active Directory:

              squid_ldap_auth -u cn -b cn=Users,dc=your,dc=domain

       If  you  want to search for the user DN and your directory
       does not allow anonymous searches then you must  also  use
       the  -D  and -w flags to specify a user DN and password to
       log in as to perform the searches,  as  in  the  following
       complex Active Directory example

              squid_ldap_auth   -p  -R  -b  dc=your,dc=domain  -D
              cn=squid,cn=users,dc=your,dc=domain -w secretsquid­
              password     -f    (&(userPrincipalName=%s)(object­
              Class=Person)) activedirectoryserver


       When constructing search filters  it  is  strongly  recom­
       mended  to  test  the  filter  using ldapsearch before you
       attempt to use squid_ldap_auth. This to  verify  that  the
       filter matches what you expect.


       This   manual   page   was  written  by  Henrik  Nordstrom

       squid_ldap_auth  is  written  by   Glenn   Newton   <gnew­
       ton@wapiti.cisti.nrc.ca>  and Henrik Nordstrom <hno@squid-


       Will crash if other % values than %s is used in -f, or  if
       more than 15 %s is used.


       Any  questions on usage can be sent to Squid Users <squid-
       users@squid-cache.org>,   or   to   your   favorite   LDAP
       list/friend  if  the question is more related to LDAP than


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