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1 | #!/usr/bin/perl |
2 | |
3 | package Catalyst::Plugin::Authentication::Credential::Password; |
4 | |
5 | use strict; |
6 | use warnings; |
7 | |
8 | use Scalar::Util (); |
9 | use Catalyst::Exception (); |
10 | use Digest (); |
11 | |
12 | sub login { |
13 | my ( $c, $user, $password ) = @_; |
14 | |
15 | for ( $c->request ) { |
16 | $user ||= $_->param("login") |
17 | || $_->param("user") |
18 | || $_->param("username") |
19 | || return; |
20 | |
21 | $password ||= $_->param("password") |
22 | || $_->param("passwd") |
23 | || $_->param("pass") |
24 | || return; |
25 | } |
26 | |
27 | $user = $c->get_user($user) || return |
28 | unless Scalar::Util::blessed($user) |
29 | and $user->isa("Catalyst:::Plugin::Authentication::User"); |
30 | |
31 | if ( $c->_check_password( $user, $password ) ) { |
32 | $c->set_authenticated($user); |
33 | return 1; |
34 | } |
35 | else { |
36 | return; |
37 | } |
38 | } |
39 | |
40 | sub _check_password { |
41 | my ( $c, $user, $password ) = @_; |
42 | |
43 | if ( $user->supports(qw/password clear/) ) { |
44 | return $user->password eq $password; |
45 | } |
46 | elsif ( $user->supports(qw/password crypted/) ) { |
47 | my $crypted = $user->crypted_password; |
48 | return $crypted eq crypt( $password, $crypted ); |
49 | } |
50 | elsif ( $user->supports(qw/password hashed/) ) { |
51 | |
52 | my $d = Digest->new( $user->hash_algorithm ); |
53 | $d->add( $user->password_pre_salt || '' ); |
54 | $d->add($password); |
55 | $d->add( $user->password_post_salt || '' ); |
56 | |
57 | my $stored = $user->hashed_password; |
58 | my $computed = $d->digest; |
59 | |
60 | return ( ( $computed eq $stored ) |
61 | || ( unpack( "H*", $computed ) eq $stored ) ); |
62 | } |
63 | elsif ( $user->supports(qw/password salted_hash/) ) { |
64 | require Crypt::SaltedHash; |
65 | |
66 | my $salt_len = |
67 | $user->can("password_salt_len") ? $user->password_salt_len : 0; |
68 | |
69 | return Crypt::SaltedHash->validate( $user->hashed_password, $password, |
70 | $salt_len ); |
71 | } |
72 | elsif ( $user->supports(qw/password self_check/) ) { |
73 | |
74 | # while somewhat silly, this is to prevent code duplication |
75 | return $user->check_password($password); |
76 | |
77 | } |
78 | else { |
79 | Catalyst::Exception->throw( |
80 | "The user object $user does not support any " |
81 | . "known password authentication mechanism." ); |
82 | } |
83 | } |
84 | |
85 | __PACKAGE__; |
86 | |
87 | __END__ |
88 | |
89 | =pod |
90 | |
91 | =head1 NAME |
92 | |
93 | Catalyst::Plugin::Authentication::Credential::Password - Authenticate a user |
94 | with a password. |
95 | |
96 | =head1 SYNOPSIS |
97 | |
98 | use Catalyst qw/ |
99 | Authentication |
100 | Authentication::Store::Foo |
101 | Authentication::Credential::Password |
102 | /; |
103 | |
104 | sub login : Local { |
105 | my ( $self, $c ) = @_; |
106 | |
107 | $c->login( $c->req->param('username'), $c->req->param('password') ); |
108 | } |
109 | |
110 | =head1 DESCRIPTION |
111 | |
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112 | This authentication credential checker takes a username (or userid) and a |
113 | password, and tries various methods of comparing a password based on what |
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114 | the chosen store's user objects support: |
115 | |
116 | =over 4 |
117 | |
118 | =item clear text password |
119 | |
120 | If the user has clear a clear text password it will be compared directly. |
121 | |
122 | =item crypted password |
123 | |
124 | If UNIX crypt hashed passwords are supported, they will be compared using |
125 | perl's builtin C<crypt> function. |
126 | |
127 | =item hashed password |
128 | |
129 | If the user object supports hashed passwords, they will be used in conjunction |
130 | with L<Digest>. |
131 | |
132 | =back |
133 | |
134 | =head1 METHODS |
135 | |
136 | =over 4 |
137 | |
138 | =item login $username, $password |
139 | |
140 | Try to log a user in. |
141 | |
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142 | C<$username> can be a string (e.g. retrieved from a form) or an object. |
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143 | If the object is a L<Catalyst::Plugin::Authentication::User> it will be used |
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144 | as is. Otherwise C<< $c->get_user >> is used to retrieve it. |
145 | |
146 | C<$password> is a string. |
147 | |
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148 | If C<$username> or C<$password> are not provided, the query parameters |
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149 | C<login>, C<user>, C<username> and C<password>, C<passwd>, C<pass> will |
150 | be tried instead. |
151 | |
152 | =back |
153 | |
154 | =head1 RELATED USAGE |
155 | |
156 | After the user is logged in, the user object for the current logged in user |
157 | can be retrieved from the context using the C<< $c->user >> method. |
158 | |
159 | The current user can be logged out again by calling the C<< $c->logout >> |
160 | method. |
161 | |
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162 | =head1 SUPPORTING THIS PLUGIN |
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163 | |
164 | For a User class to support credential verification using this plugin, it |
165 | needs to indicate what sort of password a given user supports |
166 | by implementing the C<supported_features> method in one or many of the |
167 | following ways: |
168 | |
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169 | =head2 Clear Text Passwords |
170 | |
171 | Predicate: |
172 | |
173 | $user->supported_features(qw/password clear/); |
174 | |
175 | Expected methods: |
176 | |
177 | =over 4 |
178 | |
179 | =item password |
180 | |
181 | Returns the user's clear text password as a string to be compared with C<eq>. |
182 | |
183 | =back |
184 | |
185 | =head2 Crypted Passwords |
186 | |
187 | Predicate: |
188 | |
189 | $user->supported_features(qw/password crypted/); |
190 | |
191 | Expected methods: |
192 | |
193 | =over 4 |
194 | |
195 | =item crypted_password |
196 | |
197 | Return's the user's crypted password as a string, with the salt as the first two chars. |
198 | |
199 | =back |
200 | |
201 | =head2 Hashed Passwords |
202 | |
203 | Predicate: |
204 | |
205 | $user->supported_features(qw/password hashed/); |
206 | |
207 | Expected methods: |
208 | |
209 | =over 4 |
210 | |
211 | =item hashed_password |
212 | |
213 | Return's the hash of the user's password as B<binary>. |
214 | |
215 | =item hash_algorithm |
216 | |
217 | Returns a string suitable for feeding into L<Digest/new>. |
218 | |
219 | =item password_pre_salt |
220 | |
221 | =item password_post_salt |
222 | |
223 | Returns a string to be hashed before/after the user's password. Typically only |
224 | a pre-salt is used. |
225 | |
226 | =back |
227 | |
228 | =head2 Crypt::SaltedHash Passwords |
229 | |
230 | Predicate: |
231 | |
232 | $user->supported_features(qw/password salted_hash/); |
233 | |
234 | Expected methods: |
235 | |
236 | =over 4 |
237 | |
238 | =item hashed_password |
239 | |
240 | Returns the hash of the user's password as returned from L<Crypt-SaltedHash>->generate. |
241 | |
242 | =back |
243 | |
244 | Optional methods: |
245 | |
246 | =over 4 |
247 | |
248 | =item password_salt_len |
249 | |
250 | Returns the length of salt used to generate the salted hash. |
251 | |
252 | =back |
253 | |
254 | =cut |
255 | |
256 | |