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NAME="PASSWORDCHECK"
>F.23. passwordcheck</A
></H1
><P
>  The <TT
CLASS="FILENAME"
>passwordcheck</TT
> module checks users' passwords
  whenever they are set with
  <A
HREF="sql-createrole.html"
>CREATE ROLE</A
> or
  <A
HREF="sql-alterrole.html"
>ALTER ROLE</A
>.
  If a password is considered too weak, it will be rejected and
  the command will terminate with an error.
 </P
><P
>  To enable this module, add <TT
CLASS="LITERAL"
>'$libdir/passwordcheck'</TT
>
  to <A
HREF="runtime-config-resource.html#GUC-SHARED-PRELOAD-LIBRARIES"
>shared_preload_libraries</A
> in
  <TT
CLASS="FILENAME"
>postgresql.conf</TT
>, then restart the server.
 </P
><P
>  You can adapt this module to your needs by changing the source code.
  For example, you can use
  <A
HREF="http://sourceforge.net/projects/cracklib/"
TARGET="_top"
>CrackLib</A
>
  to check passwords &mdash; this only requires uncommenting
  two lines in the <TT
CLASS="FILENAME"
>Makefile</TT
> and rebuilding the
  module.  (We cannot include <SPAN
CLASS="PRODUCTNAME"
>CrackLib</SPAN
>
  by default for license reasons.)
  Without <SPAN
CLASS="PRODUCTNAME"
>CrackLib</SPAN
>, the module enforces a few
  simple rules for password strength, which you can modify or extend
  as you see fit.
 </P
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><P
>   To prevent unencrypted passwords from being sent across the network,
   written to the server log or otherwise stolen by a database administrator,
   <SPAN
CLASS="PRODUCTNAME"
>PostgreSQL</SPAN
> allows the user to supply
   pre-encrypted passwords. Many client programs make use of this
   functionality and encrypt the password before sending it to the server.
  </P
><P
>   This limits the usefulness of the <TT
CLASS="FILENAME"
>passwordcheck</TT
>
   module, because in that case it can only try to guess the password.
   For this reason, <TT
CLASS="FILENAME"
>passwordcheck</TT
> is not
   recommended if your security requirements are high.
   It is more secure to use an external authentication method such as Kerberos
   (see <A
HREF="client-authentication.html"
>Chapter 19</A
>) than to rely on
   passwords within the database.
  </P
><P
>   Alternatively, you could modify <TT
CLASS="FILENAME"
>passwordcheck</TT
>
   to reject pre-encrypted passwords, but forcing users to set their
   passwords in clear text carries its own security risks.
  </P
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