document unixauth.pm
http://schmonz.livejournal.com/
Joey Hess
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[[!template id=plugin name=unixauth core=0 author="[[schmonz]]"]]
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[[!tag type/auth]]
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This plugin authenticates users against the Unix user database. It presents a similar UI to [[plugins/passwordauth]], but simpler, as there's no need to be able to register or change one's password.
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[pwauth](http://www.unixpapa.com/pwauth/) must be installed and working. In particular, it must be configured to recognize the UID of the calling web server, or authentication will always fail. Set `pwauth_path` to the full path of your pwauth binary.
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As [with passwordauth](/security/#index14h2), be wary of sending usernames and passwords in cleartext. Unlike with passwordauth, sniffing these credentials can get an attacker much further than mere wiki access. SSL with this plugin is a __must__.
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[[!toggle id="code" text="unixauth.pm"]]
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[[!toggleable id="code" text="""
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#!/usr/bin/perl
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# Ikiwiki unixauth authentication.
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package IkiWiki::Plugin::unixauth;
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use warnings;
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use strict;
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use IkiWiki 2.00;
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sub import { #{{{
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hook(type => "formbuilder_setup", id => "unixauth",
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call => \&formbuilder_setup);
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hook(type => "formbuilder", id => "unixauth",
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call => \&formbuilder);
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hook(type => "sessioncgi", id => "unixauth", call => \&sessioncgi);
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} # }}}
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# Checks if a string matches a user's password, and returns true or false.
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sub checkpassword ($$;$) { #{{{
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my $user=shift;
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my $password=shift;
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my $field=shift || "password";
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# It's very important that the user not be allowed to log in with
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# an empty password!
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if (! length $password) {
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return 0;
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}
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my $ret=0;
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if (! exists $config{pwauth_path}) {
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$config{pwauth_path}="/usr/libexec/pwauth";
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}
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open PWAUTH, "|$config{pwauth_path}" or die("Could not run pwauth");
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print PWAUTH "$user\n$password\n";
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close PWAUTH;
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$ret=!($?>>8);
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if ($ret) {
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my $userinfo=IkiWiki::userinfo_retrieve();
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if (! length $user || ! defined $userinfo ||
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! exists $userinfo->{$user} || ! ref $userinfo->{$user}) {
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IkiWiki::userinfo_setall($user, {
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'email' => '',
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'regdate' => time,
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});
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}
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}
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return $ret;
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} #}}}
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sub formbuilder_setup (@) { #{{{
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my %params=@_;
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my $form=$params{form};
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my $session=$params{session};
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my $cgi=$params{cgi};
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if ($form->title eq "signin") {
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$form->field(name => "name", required => 0);
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$form->field(name => "password", type => "password", required => 0);
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if ($form->submitted) {
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my $submittype=$form->submitted;
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# Set required fields based on how form was submitted.
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my %required=(
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"Login" => [qw(name password)],
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);
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foreach my $opt (@{$required{$submittype}}) {
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$form->field(name => $opt, required => 1);
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}
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# Validate password against name for Login.
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if ($submittype eq "Login") {
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$form->field(
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name => "password",
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validate => sub {
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checkpassword($form->field("name"), shift);
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},
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);
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}
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elsif ($submittype eq "Login") {
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$form->field(
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name => "name",
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validate => sub {
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my $name=shift;
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length $name &&
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IkiWiki::userinfo_get($name, "regdate");
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},
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);
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}
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}
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else {
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# First time settings.
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$form->field(name => "name");
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if ($session->param("name")) {
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$form->field(name => "name", value => $session->param("name"));
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}
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}
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}
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elsif ($form->title eq "preferences") {
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$form->field(name => "name", disabled => 1,
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value => $session->param("name"), force => 1,
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fieldset => "login");
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$form->field(name => "password", disabled => 1, type => "password",
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fieldset => "login"),
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}
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}
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sub formbuilder (@) { #{{{
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my %params=@_;
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my $form=$params{form};
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my $session=$params{session};
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my $cgi=$params{cgi};
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my $buttons=$params{buttons};
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if ($form->title eq "signin") {
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if ($form->submitted && $form->validate) {
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if ($form->submitted eq 'Login') {
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$session->param("name", $form->field("name"));
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IkiWiki::cgi_postsignin($cgi, $session);
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}
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}
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}
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elsif ($form->title eq "preferences") {
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if ($form->submitted eq "Save Preferences" && $form->validate) {
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my $user_name=$form->field('name');
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}
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}
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} #}}}
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sub sessioncgi ($$) { #{{{
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my $q=shift;
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my $session=shift;
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} #}}}
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1
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"""]]
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