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[[!template id=plugin name=unixauth core=0 author="[[schmonz]]"]]
[[!tag type/auth]]
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.
[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.
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__.
[[!toggle id="code" text="unixauth.pm"]]
[[!toggleable id="code" text="""
#!/usr/bin/perl
# Ikiwiki unixauth authentication.
package IkiWiki::Plugin::unixauth;
use warnings;
use strict;
use IkiWiki 2.00;
sub import { #{{{
hook(type => "formbuilder_setup", id => "unixauth",
call => \&formbuilder_setup);
hook(type => "formbuilder", id => "unixauth",
call => \&formbuilder);
hook(type => "sessioncgi", id => "unixauth", call => \&sessioncgi);
} # }}}
# Checks if a string matches a user's password, and returns true or false.
sub checkpassword ($$;$) { #{{{
my $user=shift;
my $password=shift;
my $field=shift || "password";
# It's very important that the user not be allowed to log in with
# an empty password!
if (! length $password) {
return 0;
}
my $ret=0;
if (! exists $config{pwauth_path}) {
$config{pwauth_path}="/usr/libexec/pwauth";
}
open PWAUTH, "|$config{pwauth_path}" or die("Could not run pwauth");
print PWAUTH "$user\n$password\n";
close PWAUTH;
$ret=!($?>>8);
if ($ret) {
my $userinfo=IkiWiki::userinfo_retrieve();
if (! length $user || ! defined $userinfo ||
! exists $userinfo->{$user} || ! ref $userinfo->{$user}) {
IkiWiki::userinfo_setall($user, {
'email' => '',
'regdate' => time,
});
}
}
return $ret;
} #}}}
sub formbuilder_setup (@) { #{{{
my %params=@_;
my $form=$params{form};
my $session=$params{session};
my $cgi=$params{cgi};
if ($form->title eq "signin") {
$form->field(name => "name", required => 0);
$form->field(name => "password", type => "password", required => 0);
if ($form->submitted) {
my $submittype=$form->submitted;
# Set required fields based on how form was submitted.
my %required=(
"Login" => [qw(name password)],
);
foreach my $opt (@{$required{$submittype}}) {
$form->field(name => $opt, required => 1);
}
# Validate password against name for Login.
if ($submittype eq "Login") {
$form->field(
name => "password",
validate => sub {
checkpassword($form->field("name"), shift);
},
);
}
elsif ($submittype eq "Login") {
$form->field(
name => "name",
validate => sub {
my $name=shift;
length $name &&
IkiWiki::userinfo_get($name, "regdate");
},
);
}
}
else {
# First time settings.
$form->field(name => "name");
if ($session->param("name")) {
$form->field(name => "name", value => $session->param("name"));
}
}
}
elsif ($form->title eq "preferences") {
$form->field(name => "name", disabled => 1,
value => $session->param("name"), force => 1,
fieldset => "login");
$form->field(name => "password", disabled => 1, type => "password",
fieldset => "login"),
}
}
sub formbuilder (@) { #{{{
my %params=@_;
my $form=$params{form};
my $session=$params{session};
my $cgi=$params{cgi};
my $buttons=$params{buttons};
if ($form->title eq "signin") {
if ($form->submitted && $form->validate) {
if ($form->submitted eq 'Login') {
$session->param("name", $form->field("name"));
IkiWiki::cgi_postsignin($cgi, $session);
}
}
}
elsif ($form->title eq "preferences") {
if ($form->submitted eq "Save Preferences" && $form->validate) {
my $user_name=$form->field('name');
}
}
} #}}}
sub sessioncgi ($$) { #{{{
my $q=shift;
my $session=shift;
} #}}}
1
"""]]
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