path: root/IkiWiki/Plugin/passwordauth.pm

#!/usr/bin/perl
# Ikiwiki password authentication.
package IkiWiki::Plugin::passwordauth;

use warnings;
use strict;
use IkiWiki 2.00;

sub import {
    hook(type => "getsetup", id => "passwordauth", "call" => \&getsetup);
        hook(type => "formbuilder_setup", id => "passwordauth", call => \&formbuilder_setup);
        hook(type => "formbuilder", id => "passwordauth", call => \&formbuilder);
    hook(type => "sessioncgi", id => "passwordauth", call => \&sessioncgi);
}

sub getsetup () {
    return
        plugin => {
            safe => 1,
            rebuild => 0,
        },
        account_creation_password => {
            type => "string",
            example => "s3cr1t",
            description => "a password that must be entered when signing up for an account",
            safe => 1,
            rebuild => 0,
        },
        password_cost => {
            type => "integer",
            example => 8,
            description => "cost of generating a password using Authen::Passphrase::BlowfishCrypt",
            safe => 1,
            rebuild => 0,
        },
}

# 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 $userinfo=IkiWiki::userinfo_retrieve();
    if (! length $user || ! defined $userinfo ||
        ! exists $userinfo->{$user} || ! ref $userinfo->{$user}) {
        return 0;
    }

    my $ret=0;
    if (exists $userinfo->{$user}->{"crypt".$field}) {
        eval q{use Authen::Passphrase};
        error $@ if $@;
        my $p = Authen::Passphrase->from_crypt($userinfo->{$user}->{"crypt".$field});
        $ret=$p->match($password);
    }
    elsif (exists $userinfo->{$user}->{$field}) {
        $ret=$password eq $userinfo->{$user}->{$field};
    }

    if ($ret &&
        (exists $userinfo->{$user}->{resettoken} ||
         exists $userinfo->{$user}->{cryptresettoken})) {
        # Clear reset token since the user has successfully logged in.
        delete $userinfo->{$user}->{resettoken};
        delete $userinfo->{$user}->{cryptresettoken};
        IkiWiki::userinfo_store($userinfo);
    }

    return $ret;
}

sub setpassword ($$;$) {
    my $user=shift;
    my $password=shift;
    my $field=shift || "password";

    eval q{use Authen::Passphrase::BlowfishCrypt};
    if (! $@) {
        my $p = Authen::Passphrase::BlowfishCrypt->new(
            cost => $config{password_cost} || 8,
            salt_random => 1,
            passphrase => $password,
        );
        IkiWiki::userinfo_set($user, "crypt$field", $p->as_crypt);
        IkiWiki::userinfo_set($user, $field, "");
    }
    else {
        IkiWiki::userinfo_set($user, $field, $password);
    }
}

sub formbuilder_setup (@) {
    my %params=@_;

    my $form=$params{form};
    my $session=$params{session};
    my $cgi=$params{cgi};

    if ($form->title eq "signin" || $form->title eq "register") {
        $form->field(name => "name", required => 0);
        $form->field(name => "password", type => "password", required => 0);
        
        if ($form->submitted eq "Register" || $form->submitted eq "Create Account") {
            $form->field(name => "confirm_password", type => "password");
            $form->field(name => "account_creation_password", type => "password")
                 if (defined $config{account_creation_password} &&
                     length $config{account_creation_password});
            $form->field(name => "email", size => 50);
            $form->title("register");
            $form->text("");
        
            $form->field(name => "confirm_password",
                validate => sub {
                    shift eq $form->field("password");
                },
            );
            $form->field(name => "password",
                validate => sub {
                    shift eq $form->field("confirm_password");
                },
            );
        }

        if ($form->submitted) {
            my $submittype=$form->submitted;
            # Set required fields based on how form was submitted.
            my %required=(
                "Login" => [qw(name password)],
                "Register" => [],
                "Create Account" => [qw(name password confirm_password email)],
                "Reset Password" => [qw(name)],
            );
            foreach my $opt (@{$required{$submittype}}) {
                $form->field(name => $opt, required => 1);
            }
    
            if ($submittype eq "Create Account") {
                $form->field(
                    name => "account_creation_password",
                    validate => sub {
                        shift eq $config{account_creation_password};
                    },
                    required => 1,
                ) if (defined $config{account_creation_password} &&
                      length $config{account_creation_password});
                $form->field(
                    name => "email",
                    validate => "EMAIL",
                );
            }

            # Validate password against name for Login.
            if ($submittype eq "Login") {
                $form->field(
                    name => "password",
                    validate => sub {
                        checkpassword($form->field("name"), shift);
                    },
                );
            }
            elsif ($submittype eq "Register" ||
                   $submittype eq "Create Account" ||
                   $submittype eq "Reset Password") {
                $form->field(name => "password", validate => 'VALUE');
            }
            
            # And make sure the entered name exists when logging
            # in or sending email, and does not when registering.
            if ($submittype eq 'Create Account' ||
                $submittype eq 'Register') {
                $form->field(
                    name => "name",
                    validate => sub {
                        my $name=shift;
                        length $name &&
                        $name=~/$config{wiki_file_regexp}/ &&
                        ! IkiWiki::userinfo_get($name, "regdate");
                    },
                );
            }
            elsif ($submittype eq "Login" ||
                   $submittype eq "Reset Password") {
                $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", type => "password",
            fieldset => "login",
            validate => sub {
                shift eq $form->field("confirm_password");
            }),
        $form->field(name => "confirm_password", type => "password",
            fieldset => "login",
            validate => sub {
                shift eq $form->field("password");
            }),
    }
}

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" || $form->title eq "register") {
        if ($form->submitted && $form->validate) {
            if ($form->submitted eq 'Login') {
                $session->param("name", $form->field("name"));
                IkiWiki::cgi_postsignin($cgi, $session);
            }
            elsif ($form->submitted eq 'Create Account') {
                my $user_name=$form->field('name');
                if (IkiWiki::userinfo_setall($user_name, {
                        'email' => $form->field('email'),
                    'regdate' => time})) {
                    setpassword($user_name, $form->field('password'));
                    $form->field(name => "confirm_password", type => "hidden");
                    $form->field(name => "email", type => "hidden");
                    $form->text(gettext("Account creation successful. Now you can Login."));
                }
                else {
                    error(gettext("Error creating account."));
                }
            }
            elsif ($form->submitted eq 'Reset Password') {
                my $user_name=$form->field("name");
                my $email=IkiWiki::userinfo_get($user_name, "email");
                if (! length $email) {
                    error(gettext("No email address, so cannot email password reset instructions."));
                }
                
                # Store a token that can be used once
                # to log the user in. This needs to be hard
                # to guess. Generating a cgi session id will
                # make it as hard to guess as any cgi session.
                eval q{use CGI::Session};
                error($@) if $@;
                my $token = CGI::Session->new->id;
                setpassword($user_name, $token, "resettoken");
                
                my $template=template("passwordmail.tmpl");
                $template->param(
                    user_name => $user_name,
                    passwordurl => IkiWiki::cgiurl(
                        'do' => "reset",
                        'name' => $user_name,
                        'token' => $token,
                    ),
                    wikiurl => $config{url},
                    wikiname => $config{wikiname},
                    REMOTE_ADDR => $ENV{REMOTE_ADDR},
                );
                
                eval q{use Mail::Sendmail};
                error($@) if $@;
                sendmail(
                    To => IkiWiki::userinfo_get($user_name, "email"),
                    From => "$config{wikiname} admin <".
                        (defined $config{adminemail} ? $config{adminemail} : "")
                        .">",
                    Subject => "$config{wikiname} information",
                    Message => $template->output,
                ) or error(gettext("Failed to send mail"));
                
                $form->text(gettext("You have been mailed password reset instructions."));
                $form->field(name => "name", required => 0);
                push @$buttons, "Reset Password";
            }
            elsif ($form->submitted eq "Register") {
                @$buttons="Create Account";
            }
        }
        elsif ($form->submitted eq "Create Account") {
            @$buttons="Create Account";
        }
        else {
            push @$buttons, "Register", "Reset Password";
        }
    }
    elsif ($form->title eq "preferences") {
        if ($form->submitted eq "Save Preferences" && $form->validate) {
            my $user_name=$form->field('name');
            if ($form->field("password") && length $form->field("password")) {
                setpassword($user_name, $form->field('password'));
            }
        }
    }
}

sub sessioncgi ($$) {
    my $q=shift;
    my $session=shift;

    if ($q->param('do') eq 'reset') {
        my $name=$q->param("name");
        my $token=$q->param("token");

        if (! defined $name || ! defined $token ||
            ! length $name  || ! length $token) {
            error(gettext("incorrect password reset url"));
        }
        if (! checkpassword($name, $token, "resettoken")) {
            error(gettext("password reset denied"));
        }

        $session->param("name", $name);
        IkiWiki::cgi_prefs($q, $session);
        exit;
    }
}

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