Annotation of palm/Palm-Keyring/lib/Palm/Keyring.pm, Revision 1.3
1.1 andrew 1: # Palm::Keyring.pm
2: #
3: # Perl class for dealing with Keyring for Palm OS databases.
4: #
5: # Copyright (C) 2004, Andrew Fresh
6: # You may distribute this file under the terms of the Artistic
7: # License, as specified in the README file distributed with the p5-Palm distribution.
8: #
9: # This started as Memo.pm, I just made it work for Keyring.
10: #
1.3 ! andrew 11: # $Id: Keyring.pm,v 1.2 2006/01/31 23:03:39 andrew Exp $
! 12: # $RedRiver: Keyring.pm,v 1.2 2006/01/31 23:03:39 andrew Exp $
1.1 andrew 13:
14: use strict;
15: package Palm::Keyring;
16: use Palm::Raw();
17: use Palm::StdAppInfo();
18: use vars qw( $VERSION @ISA );
19:
20: use Digest::MD5 qw(md5);
1.2 andrew 21: use Crypt::DES;
1.1 andrew 22:
23: use constant ENCRYPT => 1;
24: use constant DECRYPT => 0;
25: use constant MD5_CBLOCK => 64;
26: my $kSaltSize = 4;
27:
28:
29: # One liner, to allow MakeMaker to work.
1.3 ! andrew 30: $VERSION = do { my @r = (q$Revision: 1.2 $ =~ /\d+/g); sprintf "%d."."%02d" x $#r, @r };
1.1 andrew 31:
32: @ISA = qw( Palm::StdAppInfo Palm::Raw );
33:
34: =head1 NAME
35:
36: Palm::Keyring - Handler for Palm Keyring databases.
37:
38: =head1 SYNOPSIS
39:
40: use Palm::Keyring;
41: $pdb->Decrypt('mypassword');
42:
43: =head1 DESCRIPTION
44:
45: The Keyring PDB handler is a helper class for the Palm::PDB package. It
46: parses Keyring databases. See
47: L<http://gnukeyring.sourceforge.net/>.
48:
49: It is just the standard Palm::Raw with 2 additional public methods. Decrypt and Encrypt.
50:
51: =cut
52: =head2 new
53:
54: $pdb = new Palm::Keyring ('password');
55:
56: Create a new PDB, initialized with the various Palm::Keyring fields
57: and an empty record list.
58:
59: Use this method if you're creating a Keyring PDB from scratch.
60:
61: =cut
62: #'
63: sub new
64: {
65: my $classname = shift;
66: my $pass = shift;
67:
68: my $self = $classname->SUPER::new(@_);
69: # Create a generic PDB. No need to rebless it,
70: # though.
71:
72: $self->{name} = "Keys-Gtkr"; # Default
73: $self->{creator} = "Gtkr";
74: $self->{type} = "Gkyr";
75: $self->{attributes}{resource} = 0;
76: # The PDB is not a resource database by
77: # default, but it's worth emphasizing,
78: # since MemoDB is explicitly not a PRC.
79:
80: # Initialize the AppInfo block
81: $self->{appinfo} = {};
82:
83: # Add the standard AppInfo block stuff
84: &Palm::StdAppInfo::seed_StdAppInfo($self->{appinfo});
85:
86: # Set the version
87: $self->{version} = 4;
88:
89: # Give the PDB the first record that will hold the encrypted password
90: $self->{records} = [
91: {
92: 'category' => 0,
93: 'attributes' => {
94: 'private' => 1,
95: 'Secret' => 1,
96: 'Dirty' => 1,
97: 'dirty' => 1
98: },
99: },
100: ];
101:
102: if ($pass) {
103: $self->Encrypt($pass);
104: }
105:
106: return $self;
107: }
108:
109: sub import
110: {
111: &Palm::PDB::RegisterPDBHandlers(__PACKAGE__,
112: [ "Gtkr", "Gkyr" ],
113: );
1.3 ! andrew 114: }
! 115:
! 116: sub Load
! 117: {
! 118: my $self = shift;
! 119: $self->SUPER::Load(@_);
! 120:
! 121: # Skip the first 2 records because they are special
! 122: # and don't have any plaintext
! 123: my $skip = 0;
! 124: foreach my $record (@{ $self->{records} }) {
! 125: if ($skip < 2) {
! 126: $skip++;
! 127: next;
! 128: }
! 129: my ($name, $encrypted) = split /\000/, $record->{data}, 2;
! 130: $record->{plaintext}->{name} = $name;
! 131: $record->{encrypted} = $encrypted;
! 132: }
! 133: 1;
1.1 andrew 134: }
135:
136: sub Encrypt
137: {
138: my $self = shift;
139: my $pass = shift;
140:
141: if ($pass) {
142: unless ($self->_keyring_verify($pass) ) {
143: # This would encrypt with a new password.
144: # First decrypting everything with the old password of course.
145: $self->_keyring_update($pass) || return undef;
146: $self->_keyring_verify($pass) || return undef;
147: }
148: }
149:
150: my $seen_enc_pass = 0;
151: foreach my $record (@{ $self->{records} }) {
152: unless ($seen_enc_pass) {
153: $seen_enc_pass = 1;
154: next;
155: }
156:
157: next unless defined $record->{plaintext};
158:
159: my $name = defined $record->{plaintext}->{name} ? $record->{plaintext}->{name} : '';
160: my $account = defined $record->{plaintext}->{account} ? $record->{plaintext}->{account} : '';
161: my $password = defined $record->{plaintext}->{password} ? $record->{plaintext}->{password} : '';
162: my $description = defined $record->{plaintext}->{description} ? $record->{plaintext}->{description} : '';
163: my $extra = '';
164:
1.2 andrew 165: my $plaintext = join("\000", $account, $password, $description, $extra);
1.1 andrew 166:
1.2 andrew 167: my $encrypted = $self->_crypt3des($plaintext, ENCRYPT);
1.1 andrew 168:
1.2 andrew 169: $record->{data} = join("\000", $name, $encrypted);
1.1 andrew 170: }
171:
172: return 1;
173: }
174:
175: sub Decrypt
176: {
177: my $self = shift;
178: my $pass = shift;
179:
180: if ($pass) {
181: $self->_keyring_verify($pass) || return undef;
182: }
183:
184: my $seen_enc_pass = 0;
185: foreach my $record (@{ $self->{records} }) {
186: unless ($seen_enc_pass) {
187: # need to skip the first record because it is the encrypted password
188: $seen_enc_pass = 1;
189: next;
190: }
191:
192: next unless defined $record->{data};
193:
1.2 andrew 194: my ($name, $encrypted) = split /\000/, $record->{data}, 2;
1.1 andrew 195: $record->{plaintext}->{name} = $name;
196:
1.2 andrew 197: my $decrypted = $self->_crypt3des($encrypted, DECRYPT);
1.1 andrew 198: my ($account, $password, $description, $extra)
1.2 andrew 199: = split /\000/, $decrypted, 4;
1.1 andrew 200:
201: $record->{plaintext}->{account} = defined $account ? $account : '';
202: $record->{plaintext}->{password} = defined $password ? $password : '';
203: $record->{plaintext}->{description} = defined $description ? $description : '';
204:
1.2 andrew 205: print "Name: '$name'\n";
206: print "Encrypted: '$encrypted' - Length: " . length($encrypted) . "\n";
207: #print "Hex: '" . unpack("H*", $encrypted) . "'\n";
208: #print "Binary: '" . unpack("b*", $encrypted) . "'\n";
209: print "Decrypted: '$decrypted' - Length: " . length($decrypted) . "\n";
210: print "Hex: '" . unpack("H*", $decrypted) . "'\n";
211: print "Binary: '" . unpack("b*", $decrypted) . "'\n";
212: print "\n";
1.1 andrew 213: #print "Extra: $extra\n";
214: #--------------------------------------------------
215: # print "Account: $account\n";
216: # print "Password: $password\n";
217: # print "Description: $description\n";
218: #--------------------------------------------------
219:
220: }
221:
222: return 1;
223: }
224:
225: sub _calc_keys
226: {
227: my $self = shift;
228:
229: my $pass = $self->{'password'};
230: die "No password defined!" unless defined $pass;
231:
232: my $digest = md5($pass);
233:
234: my ($key1, $key2) = unpack('a8a8', $digest);
235: #--------------------------------------------------
236: # print "key1: $key1: ", length $key1, "\n";
237: # print "key2: $key2: ", length $key2, "\n";
238: #--------------------------------------------------
239:
240: $digest = unpack('H*', $key1 . $key2 . $key1);
241: #--------------------------------------------------
242: # print "Digest: ", $digest, "\n";
243: # print length $digest, "\n";
244: #--------------------------------------------------
245:
246: $self->{digest} = $digest;
247: return $digest;
248: }
249:
250: sub _keyring_verify
251: {
252: my $self = shift;
253: my $pass = shift;
254:
255: die "No password specified!" unless defined $pass;
256: $self->{password} = $pass;
257:
258: # AFAIK the thing we use to test the password is
259: # always in the first entry
260: my $data = $self->{records}->[0]->{data};
261: #die "No encrypted password in file!" unless defined $data;
262: return undef unless defined $data;
263:
264: $data =~ s/\0$//;
265:
266: my $salt = substr($data, 0, $kSaltSize);
267:
268: my $msg = $salt . $pass;
269:
270: $msg .= "\0" x (MD5_CBLOCK - length($msg));
271:
272: my $digest = md5($msg);
273:
274: if ($data eq $salt . $digest) {
275: # May as well generate the keys we need now, since we know the password is right
276: if ($self->_calc_keys()) {
277: return 1;
278: } else {
279: return undef;
280: }
281: } else {
282: return undef;
283: }
284: }
285:
286: sub _keyring_update
287: {
288: # It is very important to Encrypt after calling this
289: # (Although it is generally only called by Encrypt)
290: # because otherwise the data will be out of sync with the
291: # password, and that would suck!
292: my $self = shift;
293: my $pass = shift;
294:
295: die "No password specified!" unless defined $pass;
296:
297: # if the database already has a password in it
298: if ($self->{records}->[0]->{data}) {
299: # Make sure everything is decrypted before we update the keyring
300: $self->Decrypt() || return undef;
301: }
302:
303: my $salt;
304: for (1..$kSaltSize) {
305: $salt .= chr(int(rand(255)));
306: }
307:
308: my $msg = $salt . $pass;
309:
310: $msg .= "\0" x (MD5_CBLOCK - length($msg));
311:
312: my $digest = md5($msg);
313:
314: my $data = $salt . $digest;# . "\0";
315:
316: # AFAIK the thing we use to test the password is
317: # always in the first entry
318: $self->{records}->[0]->{data} = $data;
319:
320: $self->{password} = $pass;
321: $self->_calc_keys();
322:
323: return 1;
324: }
325:
1.2 andrew 326:
327: # XXX Have to make this encrypt as well as decrypting, but w00 h00!
328: # do null padding on the end of a cleartext if we are going to encrypt it
329: sub _crypt3des {
330: my ( $self, $plaintext, $flag ) = @_;
331:
332: my $passphrase = $self->{digest} || $self->_calc_keys();
333: $passphrase .= ' ' x (16*3);
334: my $cyphertext = "";
335:
336:
337: my $size = length ( $plaintext );
338: print "STRING: '$plaintext' - Length: " . length($plaintext) . "\n";
339:
340: # This check should see if it is plaintext first, if it is,
341: # pad it with \000
342: # if not, then die
343: die "record not 8 byte padded" if (length($plaintext) % 8) && ! $flag;
344:
345: my %C;
346: for ( 0..2 ) {
347: $C{$_} = new Crypt::DES( pack( "H*", substr($passphrase, 16*$_, 16 )));
348: }
349:
350: for ( 0 .. (($size)/8) - 1) {
351: my $pt = substr( $plaintext, $_*8, 8 );
352: print "PT: '$pt' - Length: " . length($pt) . "\n";
353: if (length($pt) < 8) {
354: my $len = 8 - length($pt);
355: print "LENGTH: $len\n";
356: print "Binary: '" . unpack("b*", $pt) . "'\n";
357: $pt .= (chr(0) x $len);# . $pt;
358: print "Binary: '" . unpack("b*", $pt) . "'\n";
359: print "PT: '$pt' - Length: " . length($pt) . "\n";
360: }
361: $pt = $C{0}->decrypt( $pt );
362: $pt = $C{1}->encrypt( $pt );
363: $pt = $C{2}->decrypt( $pt );
364: print "PT: '$pt' - Length: " . length($pt) . "\n";
365: $cyphertext .= $pt;
366: }
367:
368: return substr ( $cyphertext, 0, $size );
369: }
1.1 andrew 370:
371: 1;
372: __END__
373:
374: =head1 AUTHOR
375:
376: Andrew Fresh E<lt>andrew@mad-techies.org<gt>
377:
378: =head1 SEE ALSO
379:
380: Palm::PDB(3)
381:
382: Palm::StdAppInfo(3)
383:
384: =cut
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