On Sat, Jan 04, 2003 at 04:13:49PM -0500, Andrew wrote:
> Would you mind sharing where in the Courier source you found information
> on the authdaemond protocol? I was looking for this information some
> time ago but I guess I didn't look hard enough. If you could tell me the
> specific files to look in that would help a lot.
authlib/authdaemond.c:
function 'start' waits for a socket connection then calls 'doauth'
function 'doauth' reads characters up to a newline and then checks for
PRE xxx : calls pre(xxx)
PASSWD xxx : calls passwd(xxx)
AUTH nnn : reads nnn bytes then calls auth(data)
function 'auth' reads:
characters up to newline -> service
characters up to newline -> authtype
remainder of buffer is passed as a parameter to each auth module
It's the same authentication record as defined in the authlib(7) manpage,
i.e.
SERVICE<NEWLINE>AUTHTYPE<NEWLINE>AUTHDATA
function 'pre' is used to check a userid exists without checking its
password, see auth_prefunc in authlib(7). It splits its input on spaces:
PRE module service userid
Look for strcmp, you'll see that setting the module to '.' means try all
modules in turn, the same as is done for authentication. So:
# exim -be '${readsocket{/path/to/socket}{PRE . exim $local_part@$domain}}
will search for a user, and return the parameters if found (address_data and
${extract} give a convenient way to pick out the pieces)
passwd() looks like an interface to the password changing function:
PASSWD<tab>service<tab>userid<tab>oldpwd<tab>newpwd
but I haven't tried it.
Regards,
Brian.
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