3 # This is part of CGI::Auth::Hybrid, a perl CGI authentication module.
4 # Copyright (C) 2012 Ian Jackson.
5 # Copyright (C) 2012 Citrix.
7 # This program is free software: you can redistribute it and/or modify
8 # it under the terms of the GNU Affero General Public License as published by
9 # the Free Software Foundation, either version 3 of the License, or
10 # (at your option) any later version.
12 # This program is distributed in the hope that it will be useful,
13 # but WITHOUT ANY WARRANTY; without even the implied warranty of
14 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 # GNU Affero General Public License for more details.
17 # You should have received a copy of the GNU Affero General Public License
18 # along with this program. If not, see <http://www.gnu.org/licenses/>.
23 package CGI::Auth::Hybrid;
28 our ($VERSION, @ISA, @EXPORT, @EXPORT_OK, %EXPORT_TAGS);
33 %EXPORT_TAGS = ( ); # eg: TAG => [ qw!name1 name2! ],
35 @EXPORT_OK = qw(setup);
40 use CGI qw/escapeHTML/;
46 #---------- public utilities ----------
48 sub flatten_params ($) {
51 foreach my $k (keys %$p) {
52 foreach my $v (@{ $p->{$k} }) {
59 #---------- default callbacks ----------
61 sub has_a_param ($$) {
63 foreach my $pn (@{ $r->{S}{$cn} }) {
64 return 1 if $r->_ch('get_param',$pn);
73 foreach my $name ($c->param()) {
74 $p{$name} = [ $c->param($name) ];
79 sub get_cookie_domain ($$$) {
81 my $uri = new URI $r->_ch('get_url');
85 sub login_ok_password ($$) {
87 my $username_params = $r->{S}{username_param_names};
88 my $username = $r->_ch('get_param',$username_params->[0]);
89 my $password = $r->_rp('password_param_name');
90 return $r->_ch('username_password_ok', $username, $password);
93 sub do_redirect_cgi ($$$$) {
94 my ($c, $r, $new_url, $cookie) = @_;
95 my @ha = ('text/html',
96 -status => '303 See other',
97 -location => $new_url);
98 push @ha, (-cookie => $cookie) if defined $cookie;
99 $r->_print($c->header(@ha),
100 $r->_ch('gen_start_html',$r->_gt('Redirection')),
101 '<a href="'.escapeHTML($new_url).'">',
102 $r->_gt("If you aren't redirected, click to continue."),
104 $c->_ch('gen_end_html'));
107 sub gen_plain_login_form ($$) {
108 my ($c,$r, $params) = @_;
110 push @form, ('<form method="POST" action="'.
111 escapeHTML($r->_ch('get_url')).'">'.
113 my $sz = 'size="'.$r->{S}{form_entry_size}.'"';
114 foreach my $up (@{ $r->{S}{username_param_names}}) {
115 push @form, ('<tr><td>',$r->_gt(ucfirst $up),'</td>',
116 '<td><input type="text" ',$sz.
117 ' name=',$up,'></td></tr>');
119 push @form, ('<tr><td>'.$r->_gt('Password'),'</td>',
120 '<td><input type="password" '.$sz.
121 ' name="'.$r->{S}{password_param_name}.'"></td></tr>');
122 push @form, ('<tr><td colspan="2">',
123 '<input type="submit"'.
124 ' name="'.$r->{S}{login_submit_name}.'"'.
125 ' value="'.$r->_gt('Login').'"></td></tr>',
127 foreach my $n (keys %$params) {
128 push @form, ('<input type="hidden"'.
130 ' value="'.$params->{$n}.'">');
132 push @form, ('</form>');
133 return join "\n", @form;
136 sub gen_login_link ($$) {
137 my ($c,$r, $params) = @_;
138 my $url = $r->url_with_query_params($params);
139 return ('<a href="'.escapeHTML($url).'">'.
140 $r->_gt('Log in again to continue.').
144 #---------- verifier object methods ----------
150 assocdb_path => 'cah-assocs.db',
151 assocdb_dsn => undef,
153 assocdb_password => '',
154 assocdb_table => 'assocs',
155 random_source => '/dev/urandom',
156 associdlen => 128, # bits
157 login_timeout => 86400, # seconds
158 assoc_param_name => 'cah_associd',
159 password_param_name => 'password',
160 username_param_names => [qw(username)],
161 form_entry_size => 60,
162 logout_param_names => [qw(cah_logout)],
163 login_submit_name => [qw(cah_login)],
164 loggedout_param_names => [qw(cah_loggedout)],
165 promise_check_mutate => 0,
166 get_param => sub { $_[0]->param($_[2]) },
167 get_params => sub { $_[1]->get_params() },
168 get_cookie => sub { $_[0]->cookie($_[1]->{S}{cookie_name}) },
169 get_method => sub { $_[0]->request_method() },
170 get_url => sub { $_[0]->url(); },
171 is_login => sub { defined $_[1]->_rp('password_param_name') },
172 login_ok => \&login_ok_password,
173 username_password_ok => sub { die },
174 is_logout => sub { $_[1]->has_a_param('logout_param_names') },
175 is_loggedout => sub { $_[1]->has_a_param('loggedout_param_names') },
176 is_page => sub { return 1 },
177 handle_divert => sub { return 0 },
178 do_redirect => \&do_redirect_cgi, # this hook is allowed to throw
180 get_cookie_domain => \&get_cookie_domain,
182 gen_start_html => sub { $_[0]->start_html($_[2]); },
183 gen_end_html => sub { $_[0]->end_html(); },
184 gen_login_form => \&gen_plain_login_form,
185 gen_login_link => \&gen_plain_login_link,
186 gettext => sub { gettext($_[2]); },
187 print => sub { print $_[2] or die $!; },
192 while (($k,$v,@_) = @_) {
193 die "unknown setting $k" unless exists $verifier->{S}{$k};
194 $verifier->{S}{$k} = $v;
196 bless $verifier, $class;
197 $verifier->_dbopen();
206 $v->{S}{assocdb_dsn} ||= "dbi:SQLite:dbname=$v->{S}{assocdb_path}";
207 my $dsn = $v->{S}{assocdb_dsn};
210 $dbh = DBI->connect($dsn, $v->{S}{assocdb_user},
211 $v->{S}{assocdb_password}, {
214 ShowErrorStatement => 1,
216 die "$dsn $! ?" unless $dbh;
220 $v->_db_transaction(sub {
221 local ($dbh->{PrintError}) = 0;
222 $dbh->do("CREATE TABLE $v->{S}{assocdb_table} (".
223 " associd VARCHAR PRIMARY KEY,".
224 " username VARCHAR,".
225 " last INTEGER NOT NULL".
239 sub _db_transaction ($$) {
244 print STDERR "DT entry\n";
246 print STDERR "DT loop\n";
249 print STDERR "DT fn ok\n";
252 print STDERR "DT fn error\n";
253 { local ($@); $dbh->rollback(); }
254 print STDERR "DT fn throwing\n";
257 print STDERR "DT fn eval ok\n";
260 print STDERR "DT commit ok\n";
263 print STDERR "DT commit eval ok $rv\n";
266 print STDERR "DT commit throw?\n";
267 die $@ if !--$retries;
268 print STDERR "DT loop again\n";
272 #---------- request object methods ----------
275 my ($classbase, $cgi, @extra) = @_;
276 if (!ref $classbase) {
277 $classbase = $classbase->new_verifier(@extra);
283 S => $classbase->{S},
284 Dbh => $classbase->{Dbh},
287 bless $r, ref $classbase;
290 sub _ch ($$@) { # calls an application hook
291 my ($r,$methname, @args) = @_;
292 my $methfunc = $r->{S}{$methname};
293 die "$methname ?" unless $methfunc;
294 return $methfunc->($r->{Cgi}, $r, @args);
299 my $pn = $r->{S}{$pnvb};
300 my $p = scalar $r->_ch('get_param',$pn)
303 sub _gt ($$) { my ($r, $t) = @_; return $r->_ch('gettext',$t); }
304 sub _print ($$) { my ($r, @t) = @_; return $r->_ch('print', join '', @t); }
306 sub construct_cookie ($$$) {
307 my ($r, $cookv) = @_;
308 return undef unless $cookv;
310 my $cookt = $c->cookie(-name => $r->{S}{cookie_name},
312 -path => $r->{S}{cookie_path},
313 -domain => $r->_ch('get_cookie_domain'),
314 -expires => '+'.$r->{S}{login_timeout}.'s',
315 -secure => $r->{S}{encrypted_only});
316 print STDERR "CC $r $c $cookv $cookt\n";
320 # pages/param-sets are
321 # n normal non-mutating page
322 # r retrieval of information for JS, non-mutating
324 # u update of information by JS, mutating
327 # O "you have just logged out" page load
330 # a, aN anything including -
331 # t, tN temporary value (in our db, no logged in user yet)
332 # y, yN value corresponds to logged-in user
333 # n, nN value not in our db
335 # - no value supplied (represented in code as $cookt='')
336 # if N differs the case applies only when the two values differ
337 # (eg, a1 y2 does not apply when the logged-in value is supplied twice)
339 # "stale session" means request originates from a page from a login
340 # session which has been revoked (eg by logout); "cleared session"
341 # means request originates from a browser which has a different (or
344 # Case analysis, cookie mode, app promises re mutate:
345 # cook parm meth form
347 # any - POST nrmuoi bug or attack, fail
348 # any - GET rmuoi bug or attack, fail
349 # any any GET muoi bug or attack, fail
350 # any t any nrmu bug or attack, fail
352 # - - GET O "just logged out" page
353 # (any other) O bug or attack, fail
355 # a1 a2 POST o logout
356 # if a1 is valid, revoke it
357 # if a2 is valid, revoke it
359 # redirect to "just logged out" page
360 # (which contains link to login form)
362 # - t POST i complain about cookies being disabled
363 # (with link to login form)
365 # any n POST i complain about stale login form
366 # show new login form
368 # x1 t2 POST i login (or switch user)
370 # show new login form
372 # revoke x1 if it was valid and !=t2
373 # upgrade t2 to y2 in our db (setting username)
375 # redirect to GET of remaining params
377 # t1 a2 ANY nrmu treat as - a2 ANY
379 # y - GET n cross-site link
382 # y y GET nr fine, show page or send data
383 # y y POST nrmu mutation is OK, do operation
385 # y1 y2 GET nr request from stale page
386 # do not revoke y2 as not RESTful
389 # y1 y2 POST nrmu request from stale page
393 # y n GET n intra-site link from stale page,
394 # treat as cross-site link, show data
396 # y n POST n m intra-site form submission from stale page
397 # show "session interrupted"
398 # with link to main data page
400 # y n GET r intra-site request from stale page
403 # y n POST r u intra-site request from stale page
406 # -/n y2 GET nr intra-site link from cleared session
407 # do not revoke y2 as not RESTful
410 # -/n y2 POST nrmu request from cleared session
412 # treat as -/n n POST
414 # -/n -/n GET n cross-site link but user not logged in
415 # show login form with redirect to orig params
416 # generate fresh cookie
418 # -/n n GET rmu user not logged in
421 # -/n n POST n m user not logged in
424 # -/n n POST r u user not logged in
427 #fixme make parameter values hash of cookie values
429 sub _check_divert_core ($) {
432 my $meth = $r->_ch('get_method');
433 my $cookv = $r->_ch('get_cookie');
434 my $parmv = $r->_rp('assoc_param_name');
436 my ($cookt,$cooku) = $r->_db_lookup($cookv);
437 my $parmt = $r->_db_lookup($parmv);
439 print STDERR "_c_d_c cookt=$cookt parmt=$parmt\n";
441 if ($r->_ch('is_logout')) {
444 $r->_db_revoke($cookv);
445 $r->_db_revoke($parmv);
446 return ({ Kind => 'REDIRECT-LOGGEDOUT',
447 Message => "Logging out...",
451 if ($r->_ch('is_loggedout')) {
452 die unless $meth eq 'GET';
455 return ({ Kind => 'SMALLPAGE-LOGGEDOUT',
456 Message => "You have been logged out.",
460 if ($r->_ch('is_login')) {
462 return ({ Kind => 'LOGIN-STALE',
463 Message => "Stale session; you need to log in again.",
464 CookieVal => $r->_fresh_cookie(),
467 die unless $parmt eq 't' || $parmt eq 'y';
468 return ({ Kind => 'SMALLPAGE-NOCOOKIE',
469 Message => "You do not seem to have cookies enabled. ".
470 "You must enable cookies as we use them for login.",
471 CookieVal => $r->_fresh_cookie(),
472 Params => $r->_chain_params() })
473 if !$cookt && $parmt eq 't';
474 my $username = $r->_ch('login_ok');
475 return ({ Kind => 'LOGIN-BAD',
476 Message => "Incorrect username/password.",
478 Params => $r->_chain_params() })
479 unless defined $username && length $username;
480 $r->_db_revoke($cookv)
481 if defined $cookv && !(defined $parmv && $cookv eq $parmv);
482 $r->_db_record_login_ok($parmv,$username);
483 return ({ Kind => 'REDIRECT-LOGGEDIN',
484 Message => "Logging in...",
486 Params => $r->_chain_params() });
491 die if $parmt eq 't';
493 if ($cookt eq 'y' && $parmt eq 'y' && $cookv ne $parmv) {
494 $r->_db_revoke($parmv) if $meth eq 'POST';
499 die unless !$cookt || $cookt eq 'n';
500 die unless !$parmt || $parmt eq 'n' || $parmt eq 'y';
501 my $newv = $r->_fresh_cookie();
502 if ($meth eq 'GET') {
503 return ({ Kind => 'LOGIN-INCOMINGLINK',
504 Message => "You need to log in again.",
506 Params => $r->_chain_params() });
508 $r->_db_revoke($parmv);
509 return ({ Kind => 'LOGIN-FRESH',
510 Message => "You need to log in again.",
516 if (!$r->{S}{promise_check_mutate}) {
517 if ($meth ne 'POST') {
518 return ({ Kind => 'MAINPAGEONLY',
519 Message => 'Entering via cross-site link.',
522 # NB caller must then ignore params & path!
523 # if this is too hard they can spit out a small form
524 # with a "click to continue"
528 die unless $cookt eq 'y';
529 die unless $parmt eq 'y';
530 die unless $cookv eq $parmv;
531 $r->{Assoc} = $cookv;
532 $r->{UserOK} = $cooku;
533 print STDERR "C-D-C OK\n";
537 sub _chain_params ($) {
539 my %p = %{ $r->_ch('get_params') };
540 foreach my $pncn (keys %{ $r->{S} }) {
542 if ($pncn =~ m/_param_name$/) {
543 my $name = $r->{S}{$pncn};
544 die "$pncn ?" if ref $name;
546 } elsif ($pncn =~ m/_param_names$/) {
547 $names = $r->{S}{$pncn};
551 foreach my $name (@$names) {
558 sub _db_lookup ($$) {
560 # returns ($t,$username)
561 # where $t is one of "t" "y" "n", or "" (for -)
565 my $row = $dbh->selectrow_arrayref("SELECT username, last".
566 " FROM $r->{S}{assocdb_table}".
567 " WHERE associd = ?", {}, $v);
568 return ('') unless defined $row;
570 my ($nusername, $nlast) = @$row;
572 my $timeout = $r->{S}{login_timeout};
573 return ('n') unless !defined $timeout || time <= $nlast + $timeout;
575 return ('t') unless defined $nusername;
578 return ('y', $nusername);
581 sub _db_revoke ($$) {
582 # revokes $v if it's valid; no-op if it's not
587 $dbh->do("DELETE FROM $r->{S}{assocdb_table}".
588 " WHERE associd = ?", {}, $v);
591 sub _db_record_login_ok ($$$) {
592 my ($r,$v,$user) = @_;
595 $dbh->do("INSERT INTO $r->{S}{assocdb_table}".
596 " (associd, username, last) VALUES (?,?,?)", {},
600 sub check_divert ($) {
602 if (exists $r->{Divert}) {
606 $r->{Divert} = $r->_db_transaction(sub { $r->_check_divert_core(); });
608 print STDERR Dumper($r->{Divert});
614 die "unchecked" unless exists $r->{Divert};
618 sub get_username ($) {
620 my $divert = $r->get_divert();
621 return undef if $divert;
625 sub url_with_query_params ($$) {
626 my ($r, $params) = @_;
627 my $uri = URI->new($r->_ch('get_url'));
628 $uri->query_form(flatten_params($params));
629 return $uri->as_string();
635 my ($divert) = $r->check_divert();
636 return 1 if !$divert;
638 my $handled = $r->_ch('handle_divert',$divert);
639 return 0 if $handled;
641 my $kind = $divert->{Kind};
642 my $cookieval = $divert->{CookieVal};
643 my $params = $divert->{Params};
645 if ($kind =~ m/^REDIRECT-/) {
646 # for redirects, we honour stored NextParams and SetCookie,
647 # as we would for non-divert
648 if ($kind eq 'REDIRECT-LOGGEDOUT') {
649 $params->{$r->{S}{loggedout_param_names}[0]} = 1;
650 } elsif ($kind eq 'REDIRECT-LOGOUT') {
651 $params->{$r->{S}{logout_param_names}[0]} = 1;
652 } elsif ($kind eq 'REDIRECT-LOGGEDIN') {
656 my $new_url = $r->url_with_query_params($params);
657 my $cookie = $r->construct_cookie($r, $cookieval);
658 $r->_ch('do_redirect',$new_url, $cookie);
663 if ($kind =~ m/^LOGIN-/) {
664 $title = $r->_gt('Login');
665 push @body, $r->_gt($divert->{Message});
666 push @body, $r->_ch('gen_login_form', $params);
667 } elsif ($kind =~ m/^SMALLPAGE-/) {
668 $title = $r->_gt('Not logged in');
669 push @body, $r->_gt($divert->{Message});
670 push @body, $r->_ch('gen_login_link');
675 $r->_print($r->{Cgi}->header('text/html'),
676 $r->_ch('gen_start_html',$title),
678 $r->_ch('gen_end_html'));
683 my ($r, $bytes) = @_;
685 my $rsf = $v->{RandomHandle};
686 my $rsp = $r->{S}{random_source};
688 $v->{RandomHandle} = $rsf = new IO::File $rsp, '<' or die "$rsp $!";
692 read($rsf,$bin,$bytes) == $bytes or die "$rsp $!";
694 my $out = unpack "H*", $bin;
695 print STDERR "_random out $out\n";
698 sub _fresh_cookie ($) {
700 print STDERR "_fresh_cookie\n";
701 my $bytes = ($r->{S}{associdlen} + 7) >> 3;
702 return $r->_random($bytes);
705 sub _assert_checked ($) {
707 die "unchecked" unless exists $r->{Divert};
710 sub check_mutate ($) {
712 $r->_assert_checked();
714 my $meth = $r->_ch('get_method');
715 die "mutating non-POST" if $meth ne 'POST';
718 #---------- output ----------
722 $r->_assert_checked();
723 return defined $r->{Assoc} ? $r->{Assoc} : '';
726 sub secret_hidden_html ($) {
728 return $r->{Cgi}->hidden(-name => $r->{S}{assoc_param_name},
729 -default => $r->secret_val());
732 sub secret_cookie ($) {
734 #print STDERR "SC\n";
735 my $cookv = $r->construct_cookie($r->secret_val());
736 #print STDERR "SC=$cookv\n";
744 CGI::Auth::Hybrid - web authentication optionally using cookies
748 my $verifier = CGI::Auth::Hybrid->new_verifier(setting => value,...);
749 my $authreq = $verifier->new_request($cgi_request_object);
751 my $authreq = CGI::Auth::Hybrid->new_request($cgi_request_object,
752 setting => value,...);
754 =head1 USAGE PATTERN FOR SIMPLE APPLICATIONS
756 $authreq->check_ok() or return;
759 $authreq->check_mutate();
762 =head1 USAGE PATTERN FOR FANCY APPLICATIONS
764 my $divert_kind = $authreq->check_divert();
766 if ($divert_kind eq 'LOGGEDOUT') {
767 print "goodbye you are now logged out" and quit
768 } elsif ($divert_kind eq 'NOCOOKIES') {
769 print "you need cookies" and quit
775 $authreq->check_mutate();