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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2//EN">
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<TITLE>The Answer Guy 36:
CGI Driven Password Changes
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<H4>"The Linux Gazette...<I>making Linux just a little more fun!</I>"</H4>
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<H1><A NAME="answer">
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<font color="#B03060">The Answer Guy</font>
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<H4>By James T. Dennis,
<a href="mailto:answerguy@ssc.com">answerguy@ssc.com</a><BR>
Starshine Technical Services,
<A HREF="http://www.starshine.org/">http://www.starshine.org/</A>
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<H3 align="left"><img src="../../gx/dennis/qbubble.gif" height="50" width="60"
alt="(?) " border="0">
CGI Driven Password Changes
</H3>
<p><strong>From Terry Singleton on Sat, 05 Dec 1998
</strong></p>
<!-- ::
CGI Driven Password Changes
~~~~~~~~~~~~~~~~~~~~~~~~~~~
:: -->
<P><STRONG><IMG SRC="../../gx/dennis/qbub.gif" ALT="(?)"
HEIGHT="28" WIDTH="50" BORDER="0"
>
Hi there,
</STRONG></P>
<P><STRONG>
We recently installed a LINUX box that runs sendmail 8.9.1, we need
someway for a user to be able to change their own password, most
ISP's have a html form that allows them to do this.
</STRONG></P>
<P><STRONG>
I know this can be done with CGI and Perl, question is does anyone
have anything or know of anywhere I can find something that will do
the trick..
</STRONG></P>
<P><STRONG>
I just bought a perl/cgi so I am working in that direction, we need
something asap though. I would even pay for something.
</STRONG></P>
<P><STRONG>
Regards,
<br>Terry Singleton
<br>Network Analyst
</STRONG></P>
<BLOCKQUOTE><IMG SRC="../../gx/dennis/bbub.gif" alt="(!)"
HEIGHT="28" WIDTH="50" BORDER="0"
>
I once wrote a prototype for such a CGI script. It
wasn't fancy but it used the following basic method:
</BLOCKQUOTE>
<BLOCKQUOTE>
The form has the following fields:
</BLOCKQUOTE>
<BLOCKQUOTE> <BLOCKQUOTE> <CODE>
userid (login name):
<br>current/old password:
<br>(repeated):
<br>new password:
<br>(repeasted):
</CODE> </BLOCKQUOTE> </BLOCKQUOTE>
<BLOCKQUOTE>
... and the script does the following:
</BLOCKQUOTE>
<BLOCKQUOTE><ul>
<li>Check the consistency between the current password and the
repeat (and issue a retry screen if that fails).
<li>start an expect (or Perl comm.pl) script that:
<ul>
<li>telnet to localhost
<li>waits for a "login:" prompt
<li>sends the userid
<li>waits for a "password:" prompt
<li>send the current password
<li>waits for one of:
<ul>
<li>a shell prompt (sends passwd command)
<li>the passwd prompt (if the user shell is set
to <TT>/usr/bin/passwd).</TT>
<li>a "login incorrect" message (aborts and
returns HTML error form).
</ul>
</ul>
<li>if the process gets to <TT>.../bin/passwd</TT>'s prompt:
<ul>
<li>send the old password
<li>wait for new password prompt
<li>send the new password
<li>wait for repeat prompt
<li>sent the new password again
<li>wait for O.K. message
<li>returns HTML success page.
</ul>
</ul></BLOCKQUOTE>
<BLOCKQUOTE>
So mostly it's a matter of writing the expect or comm.pl script.
</BLOCKQUOTE>
<BLOCKQUOTE>
Unfortunately I don't have the real script handy. It
looked something like:
</BLOCKQUOTE>
<BLOCKQUOTE><pre>
#!/usr/bin/expect -f
## by Jim Dennis (<A HREF="mailto:jimd@starshine.org">jimd@starshine.org</A>)
## This should check a username/password
## pair by opening a telnet to localhost
## and trying to use that to login
## -- you might have to adjust the last
## expect block to account for your
## system shell prompts, and error messsages
## It returns 0 on success and various non-zero
## values for various modes of failure
set timeout 5
log_user 0
gets stdin name
gets stdin pw
spawn "<TT>/usr/bin/telnet</TT>" "localhost"
expect {
-- "ogin: $" { send -- "$name\r" }
timeout { send -- "\r\r" }
eof { exit 253 }
}
expect {
"ssword: $" { send -- "$pw\r" }
}
expect {
"ast login: " { exit 0 }
"(\\\$|%)" { exit 0 }
"ogin incorrect" { exit 1 }
timeout { exit 254 }
eof { exit 253 }
}
</pre></BLOCKQUOTE>
<BLOCKQUOTE>
... so you'd replace the "exit 0" clauses with
something like the following to have it change
the password instead of merely checking the password
as the example above does.
</BLOCKQUOTE>
<BLOCKQUOTE>
</BLOCKQUOTE>
<BLOCKQUOTE><pre>
set password [lindex $argv 1]
send "<TT>/bin/passwd\r</TT>"
expect "password:"
send "$password\r"
expect "password:"
send "$password\r"
</pre></BLOCKQUOTE>
<BLOCKQUOTE>
... this assumes that you got to a shell prompt. If
you use the old trick of setting the users' login shell
to <TT>/bin/passwd</TT> then you'd add another expect close to the
original script to respond to the prompt for "Old password"
--- which you'd get in lieue of a shell prompt.
</BLOCKQUOTE>
<BLOCKQUOTE>
Obviously in that case you wouldn't be "send"-ing the
<TT>/bin/passwd</TT> command to the shell prompt as I've done in
the second line of this second code example.
</BLOCKQUOTE>
<BLOCKQUOTE>
There's a package that purports to do this at:
</BLOCKQUOTE>
<BLOCKQUOTE><dl>
<dt>Linux Admin CGI Package Docu (English)
<dd><tt><A HREF="http://www.daemon.de/doc_en.html"
>http://www.daemon.de/doc_en.html</A></tt>
</dl></BLOCKQUOTE>
<BLOCKQUOTE>
... so you can try that.
</BLOCKQUOTE>
<BLOCKQUOTE>
You can also look at the Linux-admin mailing list archives
where I'm sure I've seen Glynn Clements point people
to some utility he wrote (I think I've seen this about
a dozen times).
</BLOCKQUOTE>
<BLOCKQUOTE>
A quick trip to the Linux-Admin FAQ
(<A HREF="http://www.kalug.lug.net/linux-admin-FAQ"
>http://www.kalug.lug.net/linux-admin-FAQ</A>) led me
to a list of list archives, which lead me to one with
search features. Searching on "<tt>web password change</tt>"
got me to a message that refers to:
</BLOCKQUOTE>
<BLOCKQUOTE> <BLOCKQUOTE> <CODE>
<A HREF="ftp://win.co.nz/web-pwd">ftp://win.co.nz/web-pwd</A>
</CODE> </BLOCKQUOTE> </BLOCKQUOTE>
<BLOCKQUOTE>
... I'm sure there are others out there.
</BLOCKQUOTE>
<!-- sig -->
<!-- end 41 -->
<!--startcut ======================================================= -->
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<H5 align="center"><a href="http://www.linuxgazette.com/ssc.copying.html"
>Copyright ©</a> 1999, James T. Dennis
<BR>Published in <I>The Linux Gazette</I> Issue 36 January 1999</H5>
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