3 # This is part of CGI::Auth::Flexible, 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/>.
21 use warnings FATAL => 'all';
23 package CGI::Auth::Flexible;
28 our ($VERSION, @ISA, @EXPORT, @EXPORT_OK, %EXPORT_TAGS);
33 %EXPORT_TAGS = ( ); # eg: TAG => [ qw!name1 name2! ],
40 use CGI qw/escapeHTML/;
51 #---------- public utilities ----------
53 sub flatten_params ($) {
56 foreach my $k (keys %$p) {
58 foreach my $v (@{ $p->{$k} }) {
65 #---------- default callbacks ----------
67 sub has_a_param ($$) {
69 foreach my $pn (@{ $r->{S}{$cn} }) {
70 return 1 if $r->_ch('get_param',$pn);
79 foreach my $name ($c->param()) {
80 $p{$name} = [ $c->param($name) ];
85 sub get_cookie_domain ($$$) {
87 my $uri = new URI $r->_ch('get_url');
91 sub login_ok_password ($$) {
93 my $username_params = $r->{S}{username_param_names};
94 my $username = $r->_ch('get_param',$username_params->[0]);
95 my $password = $r->_rp('password_param_name');
96 my $error = $r->_ch('username_password_error', $username, $password);
97 return defined($error) ? (undef,$error) : ($username,undef);
100 sub do_redirect_cgi ($$$$) {
101 my ($c, $r, $new_url, $cookie) = @_;
102 $r->_print($c->header($r->_cgi_header_args($cookie,
103 -status => '303 See other',
104 -location => $new_url)),
105 $r->_ch('gen_start_html',$r->_gt('Redirection')),
106 '<a href="'.escapeHTML($new_url).'">',
107 $r->_gt("If you aren't redirected, click to continue."),
109 $r->_ch('gen_end_html'));
112 sub gen_some_form ($$) {
113 my ($r, $params, $bodyfn) = @_;
114 # Calls $bodyfn->($c,$r) which returns @formbits
118 $pathinfo .= $params->{''}[0] if $params->{''};
119 push @form, ('<form method="POST" action="'.
120 escapeHTML($r->_ch('get_url').$pathinfo).'">');
121 push @form, $bodyfn->($c,$r);
122 foreach my $n (keys %$params) {
124 foreach my $val (@{ $params->{$n} }) {
125 push @form, ('<input type="hidden"'.
126 ' name="'.escapeHTML($n).'"'.
127 ' value="'.escapeHTML($val).'">');
130 push @form, ('</form>');
131 return join "\n", @form;
134 sub gen_plain_login_form ($$) {
135 my ($c,$r, $params) = @_;
136 return $r->gen_some_form($params, sub {
138 push @form, ('<table>');
139 my $sz = 'size="'.$r->{S}{form_entry_size}.'"';
140 foreach my $up (@{ $r->{S}{username_param_names}}) {
141 push @form, ('<tr><td>',$r->_gt(ucfirst $up),'</td>',
142 '<td><input type="text" '.$sz.
143 ' name='.$up.'></td></tr>');
145 push @form, ('<tr><td>'.$r->_gt('Password').'</td>',
146 '<td><input type="password" '.$sz.
147 ' name="'.$r->{S}{password_param_name}.'"></td></tr>');
148 push @form, ('<tr><td colspan="2">',
149 '<input type="submit"'.
150 ' name="'.$r->{S}{dummy_param_name_prefix}.'login"'.
151 ' value="'.$r->_gt('Login').'"></td></tr>',
157 sub gen_postmainpage_form ($$$) {
158 my ($c,$r, $params) = @_;
159 return $r->gen_some_form($params, sub {
161 push @form, ('<input type="submit"',
162 ' name="'.$r->{S}{dummy_param_name_prefix}.'submit"'.
163 ' value="'.$r->_gt('Continue').'">');
168 sub gen_plain_login_link ($$) {
169 my ($c,$r, $params) = @_;
170 my $url = $r->url_with_query_params($params);
171 return ('<a href="'.escapeHTML($url).'">'.
172 $r->_gt('Log in again to continue.').
176 #---------- verifier object methods ----------
183 assocdb_dbh => undef, # must have AutoCommit=0, RaiseError=1
184 assocdb_path => 'caf-assocs.db',
185 keys_path => 'caf-keys',
186 assocdb_dsn => undef,
188 assocdb_password => '',
189 assocdb_table => 'caf_assocs',
190 random_source => '/dev/urandom',
191 secretbits => 128, # bits
192 hash_algorithm => "SHA-256",
193 login_timeout => 86400, # seconds
194 login_form_timeout => 3600, # seconds
195 key_rollover => 86400, # seconds
196 assoc_param_name => 'caf_assochash',
197 dummy_param_name_prefix => 'caf__',
198 cookie_name => "caf_assocsecret",
199 password_param_name => 'password',
200 username_param_names => [qw(username)],
201 form_entry_size => 60,
202 logout_param_names => [qw(caf_logout)],
203 loggedout_param_names => [qw(caf_loggedout)],
204 promise_check_mutate => 0,
205 get_param => sub { $_[0]->param($_[2]) },
206 get_params => sub { $_[1]->get_params() },
207 get_path_info => sub { $_[0]->path_info() },
208 get_cookie => sub { $_[0]->cookie($_[1]->{S}{cookie_name}) },
209 get_method => sub { $_[0]->request_method() },
210 get_url => sub { $_[0]->url(); },
211 is_login => sub { defined $_[1]->_rp('password_param_name') },
212 login_ok => \&login_ok_password,
213 username_password_error => sub { die },
214 is_logout => sub { $_[1]->has_a_param('logout_param_names') },
215 is_loggedout => sub { $_[1]->has_a_param('loggedout_param_names') },
216 is_page => sub { return 1 },
217 handle_divert => sub { return 0 },
218 do_redirect => \&do_redirect_cgi, # this hook is allowed to throw
220 get_cookie_domain => \&get_cookie_domain,
222 gen_start_html => sub { $_[0]->start_html($_[2]); },
223 gen_end_html => sub { $_[0]->end_html(); },
224 gen_login_form => \&gen_plain_login_form,
225 gen_login_link => \&gen_plain_login_link,
226 gen_postmainpage_form => \&gen_postmainpage_form,
227 gettext => sub { gettext($_[2]); },
228 print => sub { print $_[2] or die $!; },
233 while (($k,$v,@_) = @_) {
234 die "unknown setting $k" unless exists $verifier->{S}{$k};
235 $verifier->{S}{$k} = $v;
237 bless $verifier, $class;
238 $verifier->_dbopen();
242 sub _db_setup_do ($$) {
246 $v->_db_transaction(sub {
247 local ($dbh->{PrintError}) = 0;
258 $dbh = $v->{S}{assocdb_dbh};
260 die if $dbh->{AutoCommit};
261 die unless $dbh->{RaiseError};
263 $v->{S}{assocdb_dsn} ||= "dbi:SQLite:dbname=".$v->_get_path('assocdb');
264 my $dsn = $v->{S}{assocdb_dsn};
267 $dbh = DBI->connect($dsn, $v->{S}{assocdb_user},
268 $v->{S}{assocdb_password}, {
271 ShowErrorStatement => 1,
274 die "$dsn $! ?" unless $dbh;
278 $v->_db_setup_do("CREATE TABLE $v->{S}{assocdb_table} (".
279 " assochash VARCHAR PRIMARY KEY,".
280 " username VARCHAR NOT NULL,".
281 " last INTEGER NOT NULL".
283 $v->_db_setup_do("CREATE INDEX $v->{S}{assocdb_table}_timeout_index".
284 " ON $v->{S}{assocdb_table}".
296 sub _db_transaction ($$) {
301 #print STDERR "DT entry\n";
303 #print STDERR "DT loop\n";
306 #print STDERR "DT fn ok\n";
309 #print STDERR "DT fn error\n";
310 { local ($@); $dbh->rollback(); }
311 #print STDERR "DT fn throwing\n";
314 #print STDERR "DT fn eval ok\n";
317 #print STDERR "DT commit ok\n";
320 #print STDERR "DT commit eval ok ",Dumper($rv);
323 #print STDERR "DT commit throw?\n";
324 die $@ if !--$retries;
325 #print STDERR "DT loop again\n";
329 #---------- request object methods ----------
332 my ($classbase, $cgi, @extra) = @_;
333 if (!ref $classbase) {
334 $classbase = $classbase->new_verifier(@extra);
340 S => $classbase->{S},
341 Dbh => $classbase->{Dbh},
344 bless $r, ref $classbase;
347 sub _ch ($$@) { # calls an application hook
348 my ($r,$methname, @args) = @_;
349 my $methfunc = $r->{S}{$methname};
350 die "$methname ?" unless $methfunc;
351 return $methfunc->($r->{Cgi}, $r, @args);
356 my $pn = $r->{S}{$pnvb};
357 my $p = scalar $r->_ch('get_param',$pn)
361 my ($v,$keybase) = @_;
362 my $leaf = $v->{S}{"${keybase}_path"};
363 my $dir = $v->{S}{dir};
364 return $leaf if $leaf =~ m,^/,;
365 die "relying on cwd by default ?! set dir" unless defined $dir;
369 sub _gt ($$) { my ($r, $t) = @_; return $r->_ch('gettext',$t); }
370 sub _print ($$) { my ($r, @t) = @_; return $r->_ch('print', join '', @t); }
372 sub construct_cookie ($$$) {
373 my ($r, $cooks) = @_;
374 return undef unless $cooks;
376 my @ca = (-name => $r->{S}{cookie_name},
378 -path => $r->{S}{cookie_path},
379 -domain => $r->_ch('get_cookie_domain'),
380 -expires => '+'.$r->{S}{login_timeout}.'s',
381 -secure => $r->{S}{encrypted_only});
382 my $cookie = $c->cookie(@ca);
383 #print STDERR "CC $r $c $cooks $cookie (@ca).\n";
387 # pages/param-sets are
388 # n normal non-mutating page
389 # r retrieval of information for JS, non-mutating
391 # u update of information by JS, mutating
394 # O "you have just logged out" page load
397 # - no value supplied (represented in code as $cookt='')
398 # n, nN value not in our db
399 # t, tN temporary value (in our db, no logged in user yet)
400 # y, yN value corresponds to logged-in user
401 # and, aggregated conditions:
402 # a, aN anything including -
404 # if N differs the case applies only when the two values differ
405 # (eg, a1 y2 does not apply when the logged-in value is supplied twice)
407 # "stale session" means request originates from a page from a login
408 # session which has been revoked (eg by logout); "cleared session"
409 # means request originates from a browser which has a different (or
412 # Case analysis, cookie mode, app promises re mutate:
413 # cook parm meth form
415 # any - POST nrmuoi bug or attack, fail
416 # any - GET rmuoi bug or attack, fail
417 # any any GET muoi bug or attack, fail
418 # any t any nrmu bug or attack, fail
420 # - - GET O "just logged out" page
421 # (any other) O bug or attack, fail
423 # a1 a2 POST o logout
424 # if a1 is valid, revoke it
425 # if a2 is valid, revoke it
427 # redirect to "just logged out" page
428 # (which contains link to login form)
430 # - t POST i complain about cookies being disabled
431 # (with link to login form)
433 # t1 t1 POST i login (or switch user)
435 # show new login form
437 # upgrade t1 to y1 in our db (setting username)
438 # redirect to GET of remaining params
440 # y1 a2 POST i complain about stale login form
442 # show new login form
444 # (other) POST i complain about stale login form
445 # show new login form
447 # t1 a2 ANY nrmu treat as - a2 ANY
449 # y - GET n cross-site link
452 # y y GET nr fine, show page or send data
453 # y y POST nrmu mutation is OK, do operation
455 # y1 y2 GET nr request from stale page
456 # do not revoke y2 as not RESTful
459 # y1 y2 POST nrmu request from stale page
463 # y n GET n intra-site link from stale page,
464 # treat as cross-site link, show data
466 # y n POST n m intra-site form submission from stale page
467 # show "session interrupted"
468 # with link to main data page
470 # y n GET r intra-site request from stale page
473 # y n POST r u intra-site request from stale page
476 # -/n y2 GET nr intra-site link from cleared session
477 # do not revoke y2 as not RESTful
480 # -/n y2 POST nrmu request from cleared session
482 # treat as -/n n POST
484 # -/n -/n GET n cross-site link but user not logged in
485 # show login form with redirect to orig params
486 # generate fresh cookie
488 # -/n n GET rmu user not logged in
491 # -/n n POST n m user not logged in
494 # -/n n POST r u user not logged in
497 sub _check_divert_core ($) {
500 my $meth = $r->_ch('get_method');
501 my $cooks = $r->_ch('get_cookie');
502 my $parmh = $r->_rp('assoc_param_name');
503 my $cookh = defined $cooks ? $r->hash($cooks) : undef;
505 my ($cookt,$cooku) = $r->_identify($cookh, $cooks);
506 my $parms = (defined $cooks && defined $parmh && $parmh eq $cookh)
508 my ($parmt) = $r->_identify($parmh, $parms);
510 #print STDERR "_c_d_c cookt=$cookt parmt=$parmt\n";
512 if ($r->_ch('is_logout')) {
515 $r->_db_revoke($cookh);
516 $r->_db_revoke($parmh);
517 return ({ Kind => 'REDIRECT-LOGGEDOUT',
518 Message => $r->_gt("Logging out..."),
522 if ($r->_ch('is_loggedout')) {
523 die unless $meth eq 'GET';
526 return ({ Kind => 'SMALLPAGE-LOGGEDOUT',
527 Message => $r->_gt("You have been logged out."),
531 if ($r->_ch('is_login')) {
534 if (!$cookt && $parmt eq 't') {
535 return ({ Kind => 'SMALLPAGE-NOCOOKIE',
536 Message => $r->_gt("You do not seem to have cookies".
537 " enabled. You must enable cookies".
538 " as we use them for login."),
539 CookieSecret => $r->_fresh_secret(),
540 Params => $r->chain_params() })
542 if (!$cookt || $cookt eq 'n' || $cookh ne $parmh) {
543 $r->_db_revoke($cookh);
544 return ({ Kind => 'LOGIN-STALE',
545 Message => $r->_gt("Stale session;".
546 " you need to log in again."),
547 CookieSecret => $r->_fresh_secret(),
550 die unless $parmt eq 't' || $parmt eq 'y';
551 my ($username, $login_errormessage) = $r->_ch('login_ok');
552 unless (defined $username && length $username) {
553 $login_errormessage = $r->_gt("Incorrect username/password.")
554 if !$login_errormessage;
555 return ({ Kind => 'LOGIN-BAD',
556 Message => $login_errormessage,
557 CookieSecret => $cooks,
558 Params => $r->chain_params() })
560 $r->_db_record_login_ok($parmh,$username);
561 return ({ Kind => 'REDIRECT-LOGGEDIN',
562 Message => $r->_gt("Logging in..."),
563 CookieSecret => $cooks,
564 Params => $r->chain_params() });
569 die if $parmt eq 't';
571 if ($cookt eq 'y' && $parmt eq 'y' && $cookh ne $parmh) {
572 $r->_db_revoke($parmh) if $meth eq 'POST';
577 die unless !$cookt || $cookt eq 'n';
578 die unless !$parmt || $parmt eq 'n' || $parmt eq 'y';
579 my $news = $r->_fresh_secret();
580 if ($meth eq 'GET') {
581 return ({ Kind => 'LOGIN-INCOMINGLINK',
582 Message => $r->_gt("You need to log in."),
583 CookieSecret => $news,
584 Params => $r->chain_params() });
586 $r->_db_revoke($parmh);
587 return ({ Kind => 'LOGIN-FRESH',
588 Message => $r->_gt("You need to log in."),
589 CookieSecret => $news,
594 if (!$r->{S}{promise_check_mutate}) {
595 if ($meth ne 'POST') {
596 return ({ Kind => 'MAINPAGEONLY',
597 Message => $r->_gt('Entering via cross-site link.'),
598 CookieSecret => $cooks,
600 # NB caller must then ignore params & path!
601 # if this is too hard they can spit out a small form
602 # with a "click to continue"
606 die unless $cookt eq 'y';
607 unless ($r->{S}{promise_check_mutate} && $meth eq 'GET') {
608 die unless $parmt eq 'y';
609 die unless $cookh eq $parmh;
611 $r->{AssocSecret} = $cooks;
612 $r->{UserOK} = $cooku;
613 #print STDERR "C-D-C OK\n";
617 sub chain_params ($) {
619 my %p = %{ $r->_ch('get_params') };
620 foreach my $pncn (keys %{ $r->{S} }) {
622 if ($pncn =~ m/_param_name$/) {
623 my $name = $r->{S}{$pncn};
624 die "$pncn ?" if ref $name;
626 } elsif ($pncn =~ m/_param_names$/) {
627 $names = $r->{S}{$pncn};
631 foreach my $name (@$names) {
635 my $dummy_prefix = $r->{S}{dummy_param_name_prefix};
636 foreach my $name (grep /^$dummy_prefix/, keys %p) {
639 die if exists $p{''};
640 $p{''} = [ $r->_ch('get_path_info') ];
646 # returns ($t,$username)
647 # where $t is one of "t" "y" "n", or "" (for -)
648 # either $s must be undef, or $h eq $r->hash($s)
650 #print STDERR "_identify\n";
651 return '' unless defined $h && length $h;
652 #print STDERR "_identify h=$h s=".(defined $s ? $s : '<undef>')."\n";
656 $dbh->do("DELETE FROM $r->{S}{assocdb_table}".
657 " WHERE last < ?", {},
658 time - $r->{S}{login_timeout});
660 my $row = $dbh->selectrow_arrayref("SELECT username, last".
661 " FROM $r->{S}{assocdb_table}".
662 " WHERE assochash = ?", {}, $h);
664 #print STDERR "_identify h=$h s=$s YES @$row\n";
665 my ($nusername, $nlast) = @$row;
666 return ('y', $nusername);
669 # Well, it's not in the database. But maybe it's a hash of a
672 return 'n' unless defined $s;
674 my ($keyt, $signature, $message, $noncet, $nonce) =
675 $s =~ m/^(\d+)\.(\w+)\.((\d+)\.(\w+))$/ or die;
677 return 'n' if time > $noncet + $r->{S}{login_form_timeout};
679 #print STDERR "_identify noncet=$noncet ok\n";
681 my $keys = $r->_open_keys();
682 while (my ($rkeyt, $rkey, $line) = $r->_read_key($keys)) {
683 #print STDERR "_identify search rkeyt=$rkeyt rkey=$rkey\n";
684 last if $rkeyt < $keyt; # too far down in the file
685 my $trysignature = $r->_hmac($rkey, $message);
686 #print STDERR "_identify search rkeyt=$rkeyt rkey=$rkey try=$trysignature\n";
687 return 't' if $trysignature eq $signature;
690 #print STDERR "_identify NO\n";
692 $keys->error and die $!;
696 sub _db_revoke ($$) {
697 # revokes $h if it's valid; no-op if it's not
702 $dbh->do("DELETE FROM $r->{S}{assocdb_table}".
703 " WHERE assochash = ?", {}, $h);
706 sub _db_record_login_ok ($$$) {
707 my ($r,$h,$user) = @_;
710 $dbh->do("INSERT INTO $r->{S}{assocdb_table}".
711 " (assochash, username, last) VALUES (?,?,?)", {},
715 sub check_divert ($) {
717 if (exists $r->{Divert}) {
721 $r->{Divert} = $r->_db_transaction(sub { $r->_check_divert_core(); });
723 #print STDERR Dumper($r->{Divert});
729 die "unchecked" unless exists $r->{Divert};
733 sub get_username ($) {
735 my $divert = $r->get_divert();
736 return undef if $divert;
740 sub url_with_query_params ($$) {
741 my ($r, $params) = @_;
742 #print STDERR "PARAMS ",Dumper($params);
743 my $uri = URI->new($r->_ch('get_url'));
744 $uri->path($uri->path() . $params->{''}[0]) if $params->{''};
745 $uri->query_form(flatten_params($params));
746 return $uri->as_string();
749 sub _cgi_header_args ($$@) {
750 my ($r, $cookie, @ha) = @_;
751 unshift @ha, qw(-type text/html);
752 push @ha, (-cookie => $cookie) if defined $cookie;
753 #print STDERR "_cgi_header_args ",join('|',@ha),".\n";
760 my ($divert) = $r->check_divert();
761 return 1 if !$divert;
763 my $handled = $r->_ch('handle_divert',$divert);
764 return 0 if $handled;
766 my $kind = $divert->{Kind};
767 my $cookiesecret = $divert->{CookieSecret};
768 my $params = $divert->{Params};
769 my $cookie = $r->construct_cookie($cookiesecret);
771 if ($kind =~ m/^REDIRECT-/) {
772 # for redirects, we honour stored NextParams and SetCookie,
773 # as we would for non-divert
774 if ($kind eq 'REDIRECT-LOGGEDOUT') {
775 $params->{$r->{S}{loggedout_param_names}[0]} = [ 1 ];
776 } elsif ($kind eq 'REDIRECT-LOGOUT') {
777 $params->{$r->{S}{logout_param_names}[0]} = [ 1 ];
778 } elsif ($kind eq 'REDIRECT-LOGGEDIN') {
782 my $new_url = $r->url_with_query_params($params);
783 $r->_ch('do_redirect',$new_url, $cookie);
787 if (defined $cookiesecret) {
788 $params->{$r->{S}{assoc_param_name}} = [ $r->hash($cookiesecret) ];
792 if ($kind =~ m/^LOGIN-/) {
793 $title = $r->_gt('Login');
794 push @body, $divert->{Message};
795 push @body, $r->_ch('gen_login_form', $params);
796 } elsif ($kind =~ m/^SMALLPAGE-/) {
797 $title = $r->_gt('Not logged in');
798 push @body, $divert->{Message};
799 push @body, $r->_ch('gen_login_link', $params);
800 } elsif ($kind =~ m/^MAINPAGEONLY$/) {
801 $title = $r->_gt('Entering secure site.');
802 push @body, $divert->{Message};
803 push @body, $r->_ch('gen_postmainpage_form', $params);
808 $r->_print($r->{Cgi}->header($r->_cgi_header_args($cookie)),
809 $r->_ch('gen_start_html',$title),
811 $r->_ch('gen_end_html'));
816 my ($r, $bytes) = @_;
818 my $rsf = $v->{RandomHandle};
819 my $rsp = $r->{S}{random_source};
821 $v->{RandomHandle} = $rsf = new IO::File $rsp, '<' or die "$rsp $!";
822 #print STDERR "RH $rsf\n";
826 read($rsf,$bin,$bytes) == $bytes or die "$rsp $!";
827 my $out = unpack "H*", $bin;
828 #print STDERR "_random out $out\n";
832 sub _random_key ($) {
834 #print STDERR "_random_key\n";
835 my $bytes = ($r->{S}{secretbits} + 7) >> 3;
836 return $r->_random($bytes);
841 # returns $gen_time_t, $key_value_in_hex, $complete_line
843 my ($gen, $k) = m/^(\d+) (\S+)$/ or die "$_ ?";
844 my $age = time - $gen;
845 next if $age > $r->{S}{key_rollover} &&
846 $age > $r->{S}{login_form_timeout}*2;
847 return ($gen, $k, $_);
854 my $spath = $r->_get_path('keys');
856 #print STDERR "_open_keys\n";
857 my $keys = new IO::File $spath, 'r+';
859 #print STDERR "_open_keys open\n";
860 stat $keys or die $!; # NB must not disturb stat _
861 my $size = (stat _)[7];
862 my $age = time - (stat _)[9];
863 #print STDERR "_open_keys open size=$size age=$age\n";
865 if $size && $age <= $r->{S}{key_rollover} / 2;
866 #print STDERR "_open_keys open bad\n";
868 # file doesn't exist, or is empty or too old
870 #print STDERR "_open_keys closed\n";
871 die "$spath $!" unless $!==&ENOENT;
872 # doesn't exist, so create it just so we can lock it
873 $keys = new IO::File $spath, 'a+';
874 die "$keys $!" unless $keys;
875 stat $keys or die $!; # NB must not disturb stat _
876 my $size = (stat _)[7];
877 #print STDERR "_open_keys created size=$size\n";
878 next if $size; # oh someone else has done it, reopen and read it
880 # file now exists is empty or too old, we must try to replace it
881 my $our_inum = (stat _)[1]; # last use of that stat _
882 flock $keys, LOCK_EX or die "$spath $!";
883 stat $spath or die "$spath $!";
884 my $path_inum = (stat _)[1];
885 #print STDERR "_open_keys locked our=$our_inum path=$path_inum\n";
886 next if $our_inum != $path_inum; # someone else has done it
887 # We now hold the lock!
888 #print STDERR "_open_keys creating\n";
889 my $newkeys = new IO::Handle;
890 sysopen $newkeys, "$spath.new", O_CREAT|O_TRUNC|O_WRONLY, 0600
891 or die "$spath.new $!";
892 # we add the new key to the front which means it's always sorted
893 print $newkeys time, ' ', $r->_random_key(), "\n" or die $!;
894 while (my ($gen,$key,$line) = $r->_read_key($keys)) {
895 #print STDERR "_open_keys copy1\n";
896 print $newkeys, $line or die $!;
898 $keys->error and die $!;
899 close $newkeys or die "$spath.new $!";
900 rename "$spath.new", "$spath" or die "$spath: $!";
901 #print STDERR "_open_keys installed\n";
902 # that rename effective unlocks, since it makes the name refer
903 # to the new file which we haven't locked
904 # we go round again opening the file at the beginning
905 # so that our caller gets a fresh handle onto the existing key file
909 sub _fresh_secret ($) {
911 #print STDERR "_fresh_secret\n";
913 my $keys = $r->_open_keys();
914 my ($keyt, $key) = $r->_read_key($keys);
915 die unless defined $keyt;
917 my $nonce = $r->_random_key();
919 my $message = "$noncet.$nonce";
921 my $signature = $r->_hmac($key, $message);
922 my $secret = "$keyt.$signature.$message";
923 #print STDERR "FRESH $secret\n";
928 my ($r, $keyhex, $message) = @_;
929 my $keybin = pack "H*", $keyhex;
930 my $alg = $r->{S}{hash_algorithm};
931 #print STDERR "hmac $alg\n";
932 my $base = new Digest $alg;
933 #print STDERR "hmac $alg $base\n";
934 my $digest = new Digest::HMAC $keybin, $base;
935 #print STDERR "hmac $alg $base $digest\n";
936 $digest->add($message);
937 return $digest->hexdigest();
941 my ($r, $message) = @_;
942 my $alg = $r->{S}{hash_algorithm};
943 #print STDERR "hash $alg\n";
944 my $digest = new Digest $alg;
945 $digest->add($message);
946 return $digest->hexdigest();
949 sub _assert_checked ($) {
951 die "unchecked" unless exists $r->{Divert};
956 my $meth = $r->_ch('get_method');
957 return $meth eq 'POST';
960 sub _must_be_post ($) {
962 my $meth = $r->_ch('get_method');
963 die "mutating non-POST" if $meth ne 'POST';
966 sub check_mutate ($) {
968 $r->_assert_checked();
975 $r->_assert_checked();
977 return $r->_is_post();
980 #---------- output ----------
982 sub secret_cookie_val ($) {
984 $r->_assert_checked();
985 return defined $r->{AssocSecret} ? $r->{AssocSecret} : '';
988 sub secret_hidden_val ($) {
990 $r->_assert_checked();
991 return defined $r->{AssocSecret} ? $r->hash($r->{AssocSecret}) : '';
994 sub secret_hidden_html ($) {
996 return $r->{Cgi}->hidden(-name => $r->{S}{assoc_param_name},
997 -default => $r->secret_hidden_val());
1000 sub secret_cookie ($) {
1002 my $secret = $r->secret_cookie_val();
1003 return undef if !defined $secret;
1004 #print STDERR "SC\n";
1005 my $cookv = $r->construct_cookie($secret);
1006 #print STDERR "SC=$cookv\n";
1016 CGI::Auth::Flexible - web authentication optionally using cookies
1020 my $verifier = CGI::Auth::Flexible->new_verifier(setting => value,...);
1021 my $authreq = $verifier->new_request($cgi_request_object);
1023 my $authreq = CGI::Auth::Flexible->new_request($cgi_request_object,
1024 setting => value,...);
1026 =head1 USAGE PATTERN FOR SIMPLE APPLICATIONS
1028 $authreq->check_ok() or return;
1031 $authreq->check_mutate();
1034 =head1 USAGE PATTERN FOR FANCY APPLICATIONS
1036 my $divert_kind = $authreq->check_divert();
1038 if ($divert_kind eq 'LOGGEDOUT') {
1039 print "goodbye you are now logged out" and quit
1040 } elsif ($divert_kind eq 'NOCOOKIES') {
1041 print "you need cookies" and quit
1047 $authreq->check_mutate();