#!/usr/bin/perl
package Catalyst::Plugin::Session;
-use base qw/Class::Accessor::Fast/;
-use strict;
-use warnings;
-
-use NEXT;
+use Moose;
+with 'MooseX::Emulate::Class::Accessor::Fast';
+use MRO::Compat;
use Catalyst::Exception ();
use Digest ();
use overload ();
use Object::Signature ();
+use Carp;
+
+use namespace::clean -except => 'meta';
-our $VERSION = "0.06";
+our $VERSION = '0.28';
+$VERSION = eval $VERSION;
my @session_data_accessors; # used in delete_session
-BEGIN {
- __PACKAGE__->mk_accessors(
+
+__PACKAGE__->mk_accessors(
"_session_delete_reason",
@session_data_accessors = qw/
_sessionid
_session
_session_expires
+ _extended_session_expires
_session_data_sig
_flash
_flash_keep_keys
_tried_loading_session_expires
_tried_loading_flash_data
/
- );
+);
+
+sub _session_plugin_config {
+ my $c = shift;
+ # FIXME - Start warning once all the state/store modules have also been updated.
+ #$c->log->warn("Deprecated 'session' config key used, please use the key 'Plugin::Session' instead")
+ # if exists $c->config->{session}
+ #$c->config->{'Plugin::Session'} ||= delete($c->config->{session}) || {};
+ $c->config->{'Plugin::Session'} ||= $c->config->{session} || {};
}
sub setup {
my $c = shift;
- $c->NEXT::setup(@_);
+ $c->maybe::next::method(@_);
$c->check_session_plugin_requirements;
$c->setup_session;
sub setup_session {
my $c = shift;
- my $cfg = ( $c->config->{session} ||= {} );
+ my $cfg = $c->_session_plugin_config;
%$cfg = (
expires => 7200,
- verify_address => 1,
+ verify_address => 0,
+ verify_user_agent => 0,
%$cfg,
);
- $c->NEXT::setup_session();
+ $c->maybe::next::method();
}
sub prepare_action {
my $c = shift;
- if ( $c->config->{session}{flash_to_stash}
+ $c->maybe::next::method(@_);
+
+ if ( $c->_session_plugin_config->{flash_to_stash}
and $c->sessionid
and my $flash_data = $c->flash )
{
@{ $c->stash }{ keys %$flash_data } = values %$flash_data;
}
-
- $c->NEXT::prepare_action(@_);
}
-sub finalize {
+sub finalize_headers {
my $c = shift;
+ # fix cookie before we send headers
$c->_save_session_expires;
+
+ return $c->maybe::next::method(@_);
+}
+
+sub finalize_body {
+ my $c = shift;
+
+ # We have to finalize our session *before* $c->engine->finalize_xxx is called,
+ # because we do not want to send the HTTP response before the session is stored/committed to
+ # the session database (or whatever Session::Store you use).
+ $c->finalize_session;
+
+ return $c->maybe::next::method(@_);
+}
+
+sub finalize_session {
+ my $c = shift;
+
+ $c->maybe::next::method(@_);
+
+ $c->_save_session_id;
$c->_save_session;
$c->_save_flash;
- $c->_save_session_id;
- $c->NEXT::finalize(@_);
+ $c->_clear_session_instance_data;
}
sub _save_session_id {
my $c = shift;
+
+ # we already called set when allocating
+ # no need to tell the state plugins anything new
}
sub _save_session_expires {
my $c = shift;
- if ( defined(my $expires = $c->_session_expires) ) {
+ if ( defined($c->_session_expires) ) {
+ my $expires = $c->session_expires; # force extension
+
my $sid = $c->sessionid;
$c->store_session_data( "expires:$sid" => $expires );
-
- $c->_session_expires(undef);
- $c->_tried_loading_session_expires(undef);
}
}
my $sid = $c->sessionid;
$c->store_session_data( "session:$sid" => $session_data );
}
-
- $c->_session(undef);
- $c->_tried_loading_session_data(undef);
}
}
delete $flash_data->{$key};
}
}
-
+
my $sid = $c->sessionid;
+ my $session_data = $c->_session;
if (%$flash_data) {
- $c->store_session_data( "flash:$sid", $flash_data );
+ $session_data->{__flash} = $flash_data;
}
else {
- $c->delete_session_data("flash:$sid");
+ delete $session_data->{__flash};
}
-
- $c->_flash(undef);
- $c->_tried_loading_flash_data(undef);
+ $c->_session($session_data);
+ $c->_save_session;
}
}
my $expires = $c->get_session_data("expires:$sid") || 0;
if ( $expires >= time() ) {
- return $c->extend_session_expires( $expires );
+ $c->_session_expires( $expires );
+ return $expires;
} else {
$c->delete_session( "session expired" );
return 0;
$c->_tried_loading_session_data(1);
if ( my $sid = $c->sessionid ) {
- if ( $c->session_expires ) { # > 0
+ if ( $c->_load_session_expires ) { # > 0
my $session_data = $c->get_session_data("session:$sid") || return;
$c->_session($session_data);
no warnings 'uninitialized'; # ne __address
- if ( $c->config->{session}{verify_address}
+ if ( $c->_session_plugin_config->{verify_address}
&& $session_data->{__address} ne $c->request->address )
{
$c->log->warn(
$c->delete_session("address mismatch");
return;
}
+ if ( $c->_session_plugin_config->{verify_user_agent}
+ && $session_data->{__user_agent} ne $c->request->user_agent )
+ {
+ $c->log->warn(
+ "Deleting session $sid due to user agent mismatch ("
+ . $session_data->{__user_agent} . " != "
+ . $c->request->user_agent . ")"
+ );
+ $c->delete_session("user agent mismatch");
+ return;
+ }
$c->log->debug(qq/Restored session "$sid"/) if $c->debug;
$c->_session_data_sig( Object::Signature::signature($session_data) ) if $session_data;
$c->_tried_loading_flash_data(1);
if ( my $sid = $c->sessionid ) {
- if ( my $flash_data = $c->_flash
- || $c->_flash( $c->get_session_data("flash:$sid") ) )
+
+ my $session_data = $c->session;
+ $c->_flash($session_data->{__flash});
+
+ if ( my $flash_data = $c->_flash )
{
$c->_flash_key_hashes({ map { $_ => Object::Signature::signature( \$flash_data->{$_} ) } keys %$flash_data });
-
+
return $flash_data;
}
}
}
}
+sub _clear_session_instance_data {
+ my $c = shift;
+ $c->$_(undef) for @session_data_accessors;
+ $c->maybe::next::method(@_); # allow other plugins to hook in on this
+}
+
+sub change_session_id {
+ my $c = shift;
+
+ my $sessiondata = $c->session;
+ my $oldsid = $c->sessionid;
+ my $newsid = $c->create_session_id;
+
+ if ($oldsid) {
+ $c->log->debug(qq/change_sessid: deleting session data from "$oldsid"/) if $c->debug;
+ $c->delete_session_data("${_}:${oldsid}") for qw/session expires flash/;
+ }
+
+ $c->log->debug(qq/change_sessid: storing session data to "$newsid"/) if $c->debug;
+ $c->store_session_data( "session:$newsid" => $sessiondata );
+
+ return $newsid;
+}
+
sub delete_session {
my ( $c, $msg ) = @_;
- $c->log->debug("Deleting session") if $c->debug;
+ $c->log->debug("Deleting session" . ( defined($msg) ? "($msg)" : '(no reason given)') ) if $c->debug;
# delete the session data
if ( my $sid = $c->sessionid ) {
# reset the values in the context object
# see the BEGIN block
- $c->$_(undef) for @session_data_accessors;
+ $c->_clear_session_instance_data;
$c->_session_delete_reason($msg);
}
sub session_expires {
my $c = shift;
- if ( defined( my $expires = $c->_session_expires ) ) {
+ if ( defined( my $expires = $c->_extended_session_expires ) ) {
return $expires;
} elsif ( defined( $expires = $c->_load_session_expires ) ) {
- $c->_session_expires($expires);
- return $expires;
+ return $c->extend_session_expires( $expires );
} else {
return 0;
}
sub extend_session_expires {
my ( $c, $expires ) = @_;
- $c->_session_expires( my $updated = $c->calculate_extended_session_expires( $expires ) );
+ $c->_extended_session_expires( my $updated = $c->calculate_extended_session_expires( $expires ) );
$c->extend_session_id( $c->sessionid, $updated );
return $updated;
}
sub calculate_initial_session_expires {
my $c = shift;
- return ( time() + $c->config->{session}{expires} );
+ return ( time() + $c->_session_plugin_config->{expires} );
}
sub calculate_extended_session_expires {
sub reset_session_expires {
my ( $c, $sid ) = @_;
- $c->_session_expires( my $exp = $c->calculate_initial_session_expires );
+
+ my $exp = $c->calculate_initial_session_expires;
+ $c->_session_expires( $exp );
+ $c->_extended_session_expires( $exp );
$exp;
}
sub sessionid {
my $c = shift;
-
+
return $c->_sessionid || $c->_load_sessionid;
}
if ( defined( my $sid = $c->get_session_id ) ) {
if ( $c->validate_session_id($sid) ) {
- $c->_sessionid( $sid );
+ # temporarily set the inner key, so that validation will work
+ $c->_sessionid($sid);
return $sid;
} else {
my $err = "Tried to set invalid session ID '$sid'";
(@{$href}{@keys}) = ((undef) x @keys);
}
-sub flash {
+sub _flash_data {
my $c = shift;
$c->_flash || $c->_load_flash || do {
$c->create_session_id_if_needed;
$c->_flash( {} );
+ };
+}
+
+sub _set_flash {
+ my $c = shift;
+ if (@_) {
+ my $items = @_ > 1 ? {@_} : $_[0];
+ croak('flash takes a hash or hashref') unless ref $items;
+ @{ $c->_flash }{ keys %$items } = values %$items;
}
}
+sub flash {
+ my $c = shift;
+ $c->_flash_data;
+ $c->_set_flash(@_);
+ return $c->_flash;
+}
+
+sub clear_flash {
+ my $c = shift;
+
+ #$c->delete_session_data("flash:" . $c->sessionid); # should this be in here? or delayed till finalization?
+ $c->_flash_key_hashes({});
+ $c->_flash_keep_keys({});
+ $c->_flash({});
+}
+
sub session_expire_key {
my ( $c, %keys ) = @_;
__updated => $now,
(
- $c->config->{session}{verify_address}
- ? ( __address => $c->request->address )
+ $c->_session_plugin_config->{verify_address}
+ ? ( __address => $c->request->address||'' )
+ : ()
+ ),
+ (
+ $c->_session_plugin_config->{verify_user_agent}
+ ? ( __user_agent => $c->request->user_agent||'' )
: ()
),
}
sub create_session_id {
my $c = shift;
-
+
my $sid = $c->generate_session_id;
$c->log->debug(qq/Created session "$sid"/) if $c->debug;
my $c = shift;
(
- $c->NEXT::dump_these(),
+ $c->maybe::next::method(),
$c->sessionid
? ( [ "Session ID" => $c->sessionid ], [ Session => $c->session ], )
}
-sub get_session_id { shift->NEXT::get_session_id(@_) }
-sub set_session_id { shift->NEXT::set_session_id(@_) }
-sub delete_session_id { shift->NEXT::delete_session_id(@_) }
-sub extend_session_id { shift->NEXT::extend_session_id(@_) }
+sub get_session_id { shift->maybe::next::method(@_) }
+sub set_session_id { shift->maybe::next::method(@_) }
+sub delete_session_id { shift->maybe::next::method(@_) }
+sub extend_session_id { shift->maybe::next::method(@_) }
__PACKAGE__;
=head1 NAME
-Catalyst::Plugin::Session - Generic Session plugin - ties together server side
-storage and client side state required to maintain session data.
+Catalyst::Plugin::Session - Generic Session plugin - ties together server side storage and client side state required to maintain session data.
=head1 SYNOPSIS
Session::State::Cookie
/;
- # you can replace Store::FastMmap with Store::File - both have sensible
- # default configurations (see their docs for details)
+ # you can replace Store::FastMmap with Store::File - both have sensible
+ # default configurations (see their docs for details)
- # more complicated backends are available for other scenarios (DBI storage,
- # etc)
+ # more complicated backends are available for other scenarios (DBI storage,
+ # etc)
# after you've loaded the plugins you can save session data
This plugin links the two pieces together.
-=head1 RECCOMENDED BACKENDS
+=head1 RECOMENDED BACKENDS
=over 4
my ( $self, $c ) = @_;
if ( exists $c->flash->{beans} ) { # false
-
+
}
}
+=item clear_flash
+
+Zap all the keys in the flash regardless of their current state.
+
=item keep_flash @keys
-If you wawnt to keep a flash key for the next request too, even if it hasn't
+If you want to keep a flash key for the next request too, even if it hasn't
changed, call C<keep_flash> and pass in the keys as arguments.
=item delete_session REASON
This method is used to invalidate a session. It takes an optional parameter
which will be saved in C<session_delete_reason> if provided.
+NOTE: This method will B<also> delete your flash data.
+
=item session_delete_reason
This accessor contains a string with the reason a session was deleted. Possible
For example:
- __PACKAGE__->config->{session}{expires} = 1000000000000; # forever
+ __PACKAGE__->config('Plugin::Session' => { expires => 1000000000000 }); # forever
# later
Note that these values are not auto extended.
+=item change_session_id
+
+By calling this method you can force a session id change while keeping all
+session data. This method might come handy when you are paranoid about some
+advanced variations of session fixation attack.
+
+If you want to prevent this session fixation scenario:
+
+ 0) let us have WebApp with anonymous and authenticated parts
+ 1) a hacker goes to vulnerable WebApp and gets a real sessionid,
+ just by browsing anonymous part of WebApp
+ 2) the hacker inserts (somehow) this values into a cookie in victim's browser
+ 3) after the victim logs into WebApp the hacker can enter his/her session
+
+you should call change_session_id in your login controller like this:
+
+ if ($c->authenticate( { username => $user, password => $pass } )) {
+ # login OK
+ $c->change_session_id;
+ ...
+ } else {
+ # login FAILED
+ ...
+ }
+
=back
=head1 INTERNAL METHODS
=item setup_session
-This method populates C<< $c->config->{session} >> with the default values
+This method populates C<< $c->config('Plugin::Session') >> with the default values
listed in L</CONFIGURATION>.
=item prepare_action
-This methoid is extended.
+This method is extended.
-It's only effect is if the (off by default) C<flash_to_stash> configuration
+Its only effect is if the (off by default) C<flash_to_stash> configuration
parameter is on - then it will copy the contents of the flash to the stash at
prepare time.
-=item finalize
+=item finalize_headers
-This method is extended and will extend the expiry time, as well as persist the
-session data if a session exists.
+This method is extended and will extend the expiry time before sending
+the response.
+
+=item finalize_body
+
+This method is extended and will call finalize_session before the other
+finalize_body methods run. Here we persist the session data if a session exists.
=item initialize_session_data
=item create_session_id
-Creates a new session id using C<generate_session_id> if there is no session ID
+Creates a new session ID using C<generate_session_id> if there is no session ID
yet.
=item validate_session_id SID
This method will return a string that can be used as a session ID. It is
supposed to be a reasonably random string with enough bits to prevent
collision. It basically takes C<session_hash_seed> and hashes it using SHA-1,
-MD5 or SHA-256, depending on the availibility of these modules.
+MD5 or SHA-256, depending on the availability of these modules.
=item session_hash_seed
=over 4
-=item *
-
-A counter
-
-=item *
-
-The current time
-
-=item *
-
-One value from C<rand>.
+=item * A counter
-=item *
+=item * The current time
-The stringified value of a newly allocated hash reference
+=item * One value from C<rand>.
-=item *
+=item * The stringified value of a newly allocated hash reference
-The stringified value of the Catalyst context object
+=item * The stringified value of the Catalyst context object
=back
-In the hopes that those combined values are entropic enough for most uses. If
+in the hopes that those combined values are entropic enough for most uses. If
this is not the case you can replace C<session_hash_seed> with e.g.
sub session_hash_seed {
Also have a look at L<Crypt::Random> and the various openssl bindings - these
modules provide APIs for cryptographically secure random data.
+=item finalize_session
+
+Clean up the session during C<finalize>.
+
+This clears the various accessors after saving to the store.
+
=item dump_these
See L<Catalyst/dump_these> - ammends the session data structure to the list of
dumped objects if session ID is defined.
+
+=item calculate_extended_session_expires
+
+=item calculate_initial_session_expires
+
+=item create_session_id_if_needed
+
+=item delete_session_id
+
+=item extend_session_expires
+
+=item extend_session_id
+
+=item get_session_id
+
+=item reset_session_expires
+
+=item session_is_valid
+
+=item set_session_id
+
=back
=head1 USING SESSIONS DURING PREPARE
C<prepare_action> L<Catalyst::Plugin::Session> will actually load the data from
the store.
- sub prepare_action {
- my $c = shift;
+ sub prepare_action {
+ my $c = shift;
- # don't touch $c->session yet!
+ # don't touch $c->session yet!
- $c->NEXT::prepare_action( @_ );
+ $c->NEXT::prepare_action( @_ );
- $c->session; # this is OK
- $c->sessionid; # this is also OK
- }
+ $c->session; # this is OK
+ $c->sessionid; # this is also OK
+ }
=head1 CONFIGURATION
- $c->config->{session} = {
+ $c->config('Plugin::Session' => {
expires => 1234,
- };
+ });
All configuation parameters are provided in a hash reference under the
-C<session> key in the configuration hash.
+C<Plugin::Session> key in the configuration hash.
=over 4
When true, C<<$c->request->address>> will be checked at prepare time. If it is
not the same as the address that initiated the session, the session is deleted.
+Defaults to false.
+
+=item verify_user_agent
+
+When true, C<<$c->request->user_agent>> will be checked at prepare time. If it
+is not the same as the user agent that initiated the session, the session is
+deleted.
+
+Defaults to false.
+
=item flash_to_stash
This option makes it easier to have actions behave the same whether they were
The value of C<< $c->request->address >> at the time the session was created.
This value is only populated if C<verify_address> is true in the configuration.
+=item __user_agent
+
+The value of C<< $c->request->user_agent >> at the time the session was created.
+This value is only populated if C<verify_user_agent> is true in the configuration.
+
=back
=head1 CAVEATS
To let these users access your site you can either disable address verification
as a whole, or provide a checkbox in the login dialog that tells the server
that it's OK for the address of the client to change. When the server sees that
-this box is checked it should delete the C<__address> sepcial key from the
+this box is checked it should delete the C<__address> special key from the
session hash when the hash is first created.
=head2 Race Conditions
-In this day and age where cleaning detergents and dutch football (not the
-american kind) teams roam the plains in great numbers, requests may happen
+In this day and age where cleaning detergents and Dutch football (not the
+American kind) teams roam the plains in great numbers, requests may happen
simultaneously. This means that there is some risk of session data being
overwritten, like this:
=item 1.
-request a starts, request b starts, with the same session id
+request a starts, request b starts, with the same session ID
=item 2.
=back
-If this is a concern in your application, a soon to be developed locking
+If this is a concern in your application, a soon-to-be-developed locking
solution is the only safe way to go. This will have a bigger overhead.
For applications where any given user is only making one request at a time this
=head1 AUTHORS
-=over 4
+Andy Grundman
-=item Andy Grundman
+Christian Hansen
-=item Christian Hansen
+Yuval Kogman, C<nothingmuch@woobling.org>
-=item Yuval Kogman, C<nothingmuch@woobling.org> (current maintainer)
+Sebastian Riedel
-=item Sebastian Riedel
+Tomas Doran (t0m) C<bobtfish@bobtfish.net> (current maintainer)
-=back
+Sergio Salvi
+
+kmx C<kmx@volny.cz>
+
+Florian Ragwitz (rafl) C<rafl@debian.org>
+
+Kent Fredric (kentnl)
And countless other contributers from #catalyst. Thanks guys!
=head1 COPYRIGHT & LICENSE
- Copyright (c) 2005 the aforementioned authors. All rights
- reserved. This program is free software; you can redistribute
- it and/or modify it under the same terms as Perl itself.
+ Copyright (c) 2005 the aforementioned authors. All rights
+ reserved. This program is free software; you can redistribute
+ it and/or modify it under the same terms as Perl itself.
=cut
projects / catagits/Catalyst-Plugin-Session.git / blobdiff