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.
+To authenticate, either [checkpassword](http://cr.yp.to/checkpwd.html) or [pwauth](http://www.unixpapa.com/pwauth/) must be installed and configured. `checkpassword` is strongly preferred. If your web server runs as an unprivileged user -- as it darn well should! -- then `checkpassword` needs to be setuid root. (Or your ikiwiki CGI wrapper, I guess, but don't do that.) Other checkpassword implementations are available, notably [checkpassword-pam](http://checkpasswd-pam.sourceforge.net/).
-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__.
+Config variables that affect the behavior of `unixauth`:
+
+* `unixauth_type`: defaults to unset, can be "checkpassword" or "pwauth"
+* `unixauth_command`: defaults to unset, should contain the full path and any arguments
+* `unixauth_requiressl`: defaults to 1, can be 0
+* `sslcookie`: needs to be 1 if `unixauth_requiressl` is 1 (perhaps this should be done automatically?)
+
+__Security__: [As with passwordauth](/security/#index14h2), be wary of sending usernames and passwords in cleartext. Unlike passwordauth, sniffing `unixauth` credentials can get an attacker much further than mere wiki access. Therefore, this plugin defaults to not even _displaying_ the login form fields unless we're running under SSL. Nobody should be able to do anything remotely dumb until the admin has done at least a little thinking. After that, dumb things are always possible. ;-)
+
+`unixauth` tests for the presence of the `HTTPS` environment variable. `Wrapper.pm` needs to be tweaked to pass it through; without that, the plugin fails closed.
+
+[[!toggle id="diff" text="Wrapper.pm.diff"]]
+
+[[!toggleable id="diff" text="""
+
+ --- Wrapper.pm.orig 2008-07-29 00:09:10.000000000 -0400
+ +++ Wrapper.pm
+ @@ -28,7 +28,7 @@ sub gen_wrapper () { #{{{
+ my @envsave;
+ push @envsave, qw{REMOTE_ADDR QUERY_STRING REQUEST_METHOD REQUEST_URI
+ CONTENT_TYPE CONTENT_LENGTH GATEWAY_INTERFACE
+ - HTTP_COOKIE REMOTE_USER} if $config{cgi};
+ + HTTP_COOKIE REMOTE_USER HTTPS} if $config{cgi};
+ my $envsave="";
+ foreach my $var (@envsave) {
+ $envsave.=<<"EOF"
+
+"""]]
[[!toggle id="code" text="unixauth.pm"]]
use IkiWiki 2.00;
sub import { #{{{
+ hook(type => "getsetup", id => "unixauth", call => \&getsetup);
hook(type => "formbuilder_setup", id => "unixauth",
call => \&formbuilder_setup);
hook(type => "formbuilder", id => "unixauth",
hook(type => "sessioncgi", id => "unixauth", call => \&sessioncgi);
} # }}}
+ sub getsetup () { #{{{
+ return
+ unixauth_type => {
+ type => "string",
+ example => "checkpassword",
+ description => "type of authenticator; can be 'checkpassword' or 'pwauth'",
+ safe => 0,
+ rebuild => 1,
+ },
+ unixauth_command => {
+ type => "string",
+ example => "/path/to/checkpassword",
+ description => "full path and any arguments",
+ safe => 0,
+ rebuild => 1,
+ },
+ unixauth_requiressl => {
+ type => "boolean",
+ example => "1",
+ description => "require SSL? strongly recommended",
+ safe => 0,
+ rebuild => 1,
+ },
+ plugin => {
+ description => "Unix user authentication",
+ safe => 0,
+ rebuild => 1,
+ },
+ } #}}}
+
# Checks if a string matches a user's password, and returns true or false.
sub checkpassword ($$;$) { #{{{
my $user=shift;
}
my $ret=0;
- if (! exists $config{pwauth_path}) {
- $config{pwauth_path}="/usr/libexec/pwauth";
+ if (! exists $config{unixauth_type}) {
+ # admin needs to carefully think over his configuration
+ return 0;
+ }
+ elsif ($config{unixauth_type} eq "checkpassword") {
+ open UNIXAUTH, "|$config{unixauth_command} true 3<&0" or die("Could not run $config{unixauth_type}");
+ print UNIXAUTH "$user\0$password\0Y123456\0";
+ close UNIXAUTH;
+ $ret=!($?>>8);
+ }
+ elsif ($config{unixauth_type} eq "pwauth") {
+ open UNIXAUTH, "|$config{unixauth_command}" or die("Could not run $config{unixauth_type}");
+ print UNIXAUTH "$user\n$password\n";
+ close UNIXAUTH;
+ $ret=!($?>>8);
+ }
+ else {
+ # no such authentication type
+ return 0;
}
- 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();
my $session=$params{session};
my $cgi=$params{cgi};
+ # if not under SSL, die before even showing a login form,
+ # unless the admin explicitly says it's fine
+ if (! exists $config{unixauth_requiressl}) {
+ $config{unixauth_requiressl} = 1;
+ }
+ if ($config{unixauth_requiressl}) {
+ if ((! $config{sslcookie}) || (! exists $ENV{'HTTPS'})) {
+ die("SSL required to login. Contact your administrator.<br>");
+ }
+ }
+
if ($form->title eq "signin") {
$form->field(name => "name", required => 0);
$form->field(name => "password", type => "password", required => 0);
);
}
+ # XXX is this reachable? looks like no
elsif ($submittype eq "Login") {
$form->field(
name => "name",