IkiWiki/Plugin/emailauth.pm

   1 #!/usr/bin/perl
   2 # Ikiwiki email address as login
   3 package IkiWiki::Plugin::emailauth;
   4
   5 use warnings;
   6 use strict;
   7 use IkiWiki 3.00;
   8
   9 sub import {
  10         hook(type => "getsetup", id => "emailauth", "call" => \&getsetup);
  11         hook(type => "cgi", id => "emailauth", "call" => \&cgi);
  12         hook(type => "formbuilder_setup", id => "emailauth", "call" => \&formbuilder_setup);
  13         IkiWiki::loadplugin("loginselector");
  14         IkiWiki::Plugin::loginselector::register_login_plugin(
  15                 "emailauth",
  16                 \&email_setup,
  17                 \&email_check_input,
  18                 \&email_auth,
  19         );
  20 }
  21
  22 sub getsetup () {
  23         return
  24                 plugin => {
  25                         safe => 1,
  26                         rebuild => 0,
  27                         section => "auth",
  28                 },
  29                 emailauth_sender => {
  30                         type => "string",
  31                         description => "email address to send emailauth mails as (default: adminemail)",
  32                         safe => 1,
  33                         rebuild => 0,
  34                 },
  35 }
  36
  37 sub email_setup ($$) {
  38         my $q=shift;
  39         my $template=shift;
  40
  41         return 1;
  42 }
  43
  44 sub email_check_input ($) {
  45         my $cgi=shift;
  46         defined $cgi->param('do')
  47                 && $cgi->param("do") eq "signin"
  48                 && defined $cgi->param('Email_entry')
  49                 && length $cgi->param('Email_entry');
  50 }
  51
  52 # Send login link to email.
  53 sub email_auth ($$$$) {
  54         my $cgi=shift;
  55         my $session=shift;
  56         my $errordisplayer=shift;
  57         my $infodisplayer=shift;
  58
  59         my $email=$cgi->param('Email_entry');
  60         unless ($email =~ /.\@./) {
  61                 $errordisplayer->(gettext("Invalid email address."));
  62                 return;
  63         }
  64
  65         # Implicit account creation.
  66         my $userinfo=IkiWiki::userinfo_retrieve();
  67         if (! exists $userinfo->{$email} || ! ref $userinfo->{$email}) {
  68                 IkiWiki::userinfo_setall($email, {
  69                         'email' => $email,
  70                         'regdate' => time,
  71                 });
  72         }
  73
  74         my $token=gentoken($email, $session);
  75         my $template=template("emailauth.tmpl");
  76         $template->param(
  77                 wikiname => $config{wikiname},
  78                 # Intentionally using short field names to keep link short.
  79                 authurl => IkiWiki::cgiurl_abs_samescheme(
  80                         'e' => $email,
  81                         'v' => $token,
  82                 ),
  83         );
  84
  85         eval q{use Mail::Sendmail};
  86         error($@) if $@;
  87         my $shorturl=$config{url};
  88         $shorturl=~s/^https?:\/\///i;
  89         my $emailauth_sender=$config{emailauth_sender};
  90         $emailauth_sender=$config{adminemail} unless defined $emailauth_sender;
  91         sendmail(
  92                 To => $email,
  93                 From => "$config{wikiname} admin <".
  94                         (defined $emailauth_sender ? $emailauth_sender : "")
  95                         .">",
  96                 Subject => "$config{wikiname} login | $shorturl",
  97                 Message => $template->output,
  98         ) or error(gettext("Failed to send mail"));
  99
 100         $infodisplayer->(gettext("You have been sent an email, with a link you can open to complete the login process."));
 101 }
 102
 103 # Finish login process.
 104 sub cgi ($$) {
 105         my $cgi=shift;
 106
 107         my $email=$cgi->param('e');
 108         my $v=$cgi->param('v');
 109         if (defined $email && defined $v && length $email && length $v) {
 110                 my $token=gettoken($email);
 111                 if ($token eq $v) {
 112                         cleartoken($email);
 113                         my $session=getsession($email);
 114                         IkiWiki::cgi_postsignin($cgi, $session);
 115                 }
 116                 elsif (length $token ne length $cgi->param('v')) {
 117                         error(gettext("Wrong login token length. Please check that you pasted in the complete login link from the email!"));
 118                 }
 119                 else {
 120                         loginfailure();
 121                 }
 122         }
 123 }
 124
 125 sub formbuilder_setup (@) {
 126         my %params=@_;
 127         my $form=$params{form};
 128         my $session=$params{session};
 129
 130         if ($form->title eq "preferences" &&
 131             IkiWiki::emailuser($session->param("name"))) {
 132                 $form->field(name => "email", disabled => 1);
 133         }
 134 }
 135
 136 # Generates the token that will be used in the authurl to log the user in.
 137 # This needs to be hard to guess, and relatively short. Generating a cgi
 138 # session id will make it as hard to guess as any cgi session.
 139 #
 140 # Store token in userinfo; this allows the user to log in
 141 # using a different browser session, if it takes a while for the
 142 # email to get to them.
 143 #
 144 # The postsignin value from the session is also stored in the userinfo
 145 # to allow resuming in a different browser session.
 146 sub gentoken ($$) {
 147         my $email=shift;
 148         my $session=shift;
 149         eval q{use CGI::Session};
 150         error($@) if $@;
 151         my $token = CGI::Session->new("driver:DB_File", undef, {FileName => "/dev/null"})->id;
 152         IkiWiki::userinfo_set($email, "emailauthexpire", time+(60*60*24));
 153         IkiWiki::userinfo_set($email, "emailauth", $token);
 154         IkiWiki::userinfo_set($email, "emailauthpostsignin", defined $session->param("postsignin") ? $session->param("postsignin") : "");
 155         return $token;
 156 }
 157
 158 # Gets the token, checking for expiry.
 159 sub gettoken ($) {
 160         my $email=shift;
 161         my $val=IkiWiki::userinfo_get($email, "emailauth");
 162         my $expire=IkiWiki::userinfo_get($email, "emailauthexpire");
 163         if (! length $val || time > $expire) {
 164                 loginfailure();
 165         }
 166         return $val;
 167 }
 168
 169 # Generate a session to use after successful login.
 170 sub getsession ($) {
 171         my $email=shift;
 172
 173         IkiWiki::lockwiki();
 174         IkiWiki::loadindex();
 175         my $session=IkiWiki::cgi_getsession();
 176
 177         my $postsignin=IkiWiki::userinfo_get($email, "emailauthpostsignin");
 178         IkiWiki::userinfo_set($email, "emailauthpostsignin", "");
 179         if (defined $postsignin && length $postsignin) {
 180                 $session->param(postsignin => $postsignin);
 181         }
 182
 183         $session->param(name => $email);
 184         my $nickname=$email;
 185         $nickname=~s/@.*//;
 186         $session->param(nickname => Encode::decode_utf8($nickname));
 187
 188         IkiWiki::cgi_savesession($session);
 189
 190         return $session;
 191 }
 192
 193 sub cleartoken ($) {
 194         my $email=shift;
 195         IkiWiki::userinfo_set($email, "emailauthexpire", 0);
 196         IkiWiki::userinfo_set($email, "emailauth", "");
 197 }
 198
 199 sub loginfailure () {
 200         error "Bad email authentication token. Please retry login.";
 201 }
 202
 203 1