Annotation of palm/Palm-Keyring/lib/Palm/Keyring.pm, Revision 1.5
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: #
1.5 ! andrew 11: # $Id: Keyring.pm,v 1.4 2006/11/10 04:21:17 andrew Exp $
! 12: # $RedRiver: Keyring.pm,v 1.4 2006/11/10 04:21:17 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.
1.5 ! andrew 30: $VERSION = do { my @r = (q$Revision: 1.4 $ =~ /\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:
1.5 ! andrew 68: # Create a generic PDB. No need to rebless it, though.
1.1 andrew 69: my $self = $classname->SUPER::new(@_);
70:
71: $self->{name} = "Keys-Gtkr"; # Default
72: $self->{creator} = "Gtkr";
73: $self->{type} = "Gkyr";
1.5 ! andrew 74: # The PDB is not a resource database by
! 75: # default, but it's worth emphasizing,
! 76: # since MemoDB is explicitly not a PRC.
1.1 andrew 77: $self->{attributes}{resource} = 0;
78:
79: # Initialize the AppInfo block
80: $self->{appinfo} = {};
81:
82: # Add the standard AppInfo block stuff
83: &Palm::StdAppInfo::seed_StdAppInfo($self->{appinfo});
84:
85: # Set the version
86: $self->{version} = 4;
87:
88: # Give the PDB the first record that will hold the encrypted password
1.5 ! andrew 89: $self->{records} = [ {
! 90: 'category' => 0,
! 91: 'attributes' => {
! 92: 'private' => 1,
! 93: 'Secret' => 1,
! 94: 'Dirty' => 1,
! 95: 'dirty' => 1
1.1 andrew 96: },
1.5 ! andrew 97: }, ];
1.1 andrew 98:
99: if ($pass) {
100: $self->Encrypt($pass);
101: }
102:
103: return $self;
104: }
105:
106: sub import
107: {
108: &Palm::PDB::RegisterPDBHandlers(__PACKAGE__,
109: [ "Gtkr", "Gkyr" ],
110: );
1.3 andrew 111: }
112:
113: sub Load
114: {
115: my $self = shift;
116: $self->SUPER::Load(@_);
117:
118: # Skip the first 2 records because they are special
119: # and don't have any plaintext
120: my $skip = 0;
121: foreach my $record (@{ $self->{records} }) {
122: if ($skip < 2) {
123: $skip++;
124: next;
125: }
126: my ($name, $encrypted) = split /\000/, $record->{data}, 2;
127: $record->{plaintext}->{name} = $name;
128: $record->{encrypted} = $encrypted;
129: }
130: 1;
1.1 andrew 131: }
132:
133: sub Encrypt
134: {
135: my $self = shift;
136: my $pass = shift;
137:
138: if ($pass) {
139: unless ($self->_keyring_verify($pass) ) {
140: # This would encrypt with a new password.
141: # First decrypting everything with the old password of course.
142: $self->_keyring_update($pass) || return undef;
143: $self->_keyring_verify($pass) || return undef;
144: }
145: }
146:
147: my $seen_enc_pass = 0;
148: foreach my $record (@{ $self->{records} }) {
149: unless ($seen_enc_pass) {
150: $seen_enc_pass = 1;
151: next;
152: }
153:
154: next unless defined $record->{plaintext};
155:
156: my $name = defined $record->{plaintext}->{name} ? $record->{plaintext}->{name} : '';
157: my $account = defined $record->{plaintext}->{account} ? $record->{plaintext}->{account} : '';
158: my $password = defined $record->{plaintext}->{password} ? $record->{plaintext}->{password} : '';
159: my $description = defined $record->{plaintext}->{description} ? $record->{plaintext}->{description} : '';
160: my $extra = '';
161:
1.2 andrew 162: my $plaintext = join("\000", $account, $password, $description, $extra);
1.1 andrew 163:
1.2 andrew 164: my $encrypted = $self->_crypt3des($plaintext, ENCRYPT);
1.1 andrew 165:
1.2 andrew 166: $record->{data} = join("\000", $name, $encrypted);
1.1 andrew 167: }
168:
169: return 1;
170: }
171:
172: sub Decrypt
173: {
174: my $self = shift;
175: my $pass = shift;
176:
177: if ($pass) {
178: $self->_keyring_verify($pass) || return undef;
179: }
180:
181: my $seen_enc_pass = 0;
182: foreach my $record (@{ $self->{records} }) {
183: unless ($seen_enc_pass) {
184: # need to skip the first record because it is the encrypted password
185: $seen_enc_pass = 1;
186: next;
187: }
188:
189: next unless defined $record->{data};
190:
1.2 andrew 191: my ($name, $encrypted) = split /\000/, $record->{data}, 2;
1.1 andrew 192: $record->{plaintext}->{name} = $name;
193:
1.2 andrew 194: my $decrypted = $self->_crypt3des($encrypted, DECRYPT);
1.1 andrew 195: my ($account, $password, $description, $extra)
1.2 andrew 196: = split /\000/, $decrypted, 4;
1.1 andrew 197:
198: $record->{plaintext}->{account} = defined $account ? $account : '';
199: $record->{plaintext}->{password} = defined $password ? $password : '';
200: $record->{plaintext}->{description} = defined $description ? $description : '';
201:
1.4 andrew 202: #print "Name: '$name'\n";
203: #print "Encrypted: '$encrypted' - Length: " . length($encrypted) . "\n";
1.2 andrew 204: #print "Hex: '" . unpack("H*", $encrypted) . "'\n";
205: #print "Binary: '" . unpack("b*", $encrypted) . "'\n";
1.4 andrew 206: #print "Decrypted: '$decrypted' - Length: " . length($decrypted) . "\n";
207: #print "Hex: '" . unpack("H*", $decrypted) . "'\n";
208: #print "Binary: '" . unpack("b*", $decrypted) . "'\n";
209: #print "\n";
1.1 andrew 210: #print "Extra: $extra\n";
211: #--------------------------------------------------
212: # print "Account: $account\n";
213: # print "Password: $password\n";
214: # print "Description: $description\n";
215: #--------------------------------------------------
216:
217: }
218:
219: return 1;
220: }
221:
222: sub _calc_keys
223: {
224: my $self = shift;
225:
226: my $pass = $self->{'password'};
227: die "No password defined!" unless defined $pass;
228:
229: my $digest = md5($pass);
230:
231: my ($key1, $key2) = unpack('a8a8', $digest);
232: #--------------------------------------------------
233: # print "key1: $key1: ", length $key1, "\n";
234: # print "key2: $key2: ", length $key2, "\n";
235: #--------------------------------------------------
236:
237: $digest = unpack('H*', $key1 . $key2 . $key1);
238: #--------------------------------------------------
239: # print "Digest: ", $digest, "\n";
240: # print length $digest, "\n";
241: #--------------------------------------------------
242:
243: $self->{digest} = $digest;
244: return $digest;
245: }
246:
247: sub _keyring_verify
248: {
249: my $self = shift;
250: my $pass = shift;
251:
1.4 andrew 252: die "No password specified!" unless $pass;
1.1 andrew 253: $self->{password} = $pass;
254:
255: # AFAIK the thing we use to test the password is
256: # always in the first entry
257: my $data = $self->{records}->[0]->{data};
258: #die "No encrypted password in file!" unless defined $data;
259: return undef unless defined $data;
260:
261: $data =~ s/\0$//;
262:
263: my $salt = substr($data, 0, $kSaltSize);
264:
265: my $msg = $salt . $pass;
266:
267: $msg .= "\0" x (MD5_CBLOCK - length($msg));
268:
269: my $digest = md5($msg);
270:
271: if ($data eq $salt . $digest) {
272: # May as well generate the keys we need now, since we know the password is right
273: if ($self->_calc_keys()) {
274: return 1;
275: } else {
276: return undef;
277: }
278: } else {
279: return undef;
280: }
281: }
282:
283: sub _keyring_update
284: {
285: # It is very important to Encrypt after calling this
286: # (Although it is generally only called by Encrypt)
287: # because otherwise the data will be out of sync with the
288: # password, and that would suck!
289: my $self = shift;
290: my $pass = shift;
291:
1.4 andrew 292: die "No password specified!" unless $pass;
1.1 andrew 293:
294: # if the database already has a password in it
295: if ($self->{records}->[0]->{data}) {
296: # Make sure everything is decrypted before we update the keyring
297: $self->Decrypt() || return undef;
298: }
299:
300: my $salt;
301: for (1..$kSaltSize) {
302: $salt .= chr(int(rand(255)));
303: }
304:
305: my $msg = $salt . $pass;
306:
307: $msg .= "\0" x (MD5_CBLOCK - length($msg));
308:
309: my $digest = md5($msg);
310:
311: my $data = $salt . $digest;# . "\0";
312:
313: # AFAIK the thing we use to test the password is
314: # always in the first entry
315: $self->{records}->[0]->{data} = $data;
316:
317: $self->{password} = $pass;
318: $self->_calc_keys();
319:
320: return 1;
321: }
322:
1.2 andrew 323:
324: # XXX Have to make this encrypt as well as decrypting, but w00 h00!
325: # do null padding on the end of a cleartext if we are going to encrypt it
326: sub _crypt3des {
1.4 andrew 327: my ( $self, $plaintext, $flag ) = @_;
1.2 andrew 328:
329: my $passphrase = $self->{digest} || $self->_calc_keys();
1.4 andrew 330: $passphrase .= ' ' x (16*3);
331: my $cyphertext = "";
1.2 andrew 332:
333:
1.4 andrew 334: my $size = length ( $plaintext );
335: #print "STRING: '$plaintext' - Length: " . length($plaintext) . "\n";
1.2 andrew 336:
1.4 andrew 337: # This check should see if it is plaintext first, if it is,
338: # pad it with \000
339: # if not, then die
340: die "record not 8 byte padded" if (length($plaintext) % 8) && ! $flag;
1.2 andrew 341:
1.5 ! andrew 342: my @C;
1.4 andrew 343: for ( 0..2 ) {
1.5 ! andrew 344: $C[$_] = new Crypt::DES( pack( "H*", substr($passphrase, 16*$_, 16 )));
1.4 andrew 345: }
346:
347: for ( 0 .. (($size)/8) - 1) {
348: my $pt = substr( $plaintext, $_*8, 8 );
349: #print "PT: '$pt' - Length: " . length($pt) . "\n";
350: if (length($pt) < 8) {
351: my $len = 8 - length($pt);
352: print "LENGTH: $len\n";
353: print "Binary: '" . unpack("b*", $pt) . "'\n";
354: $pt .= (chr(0) x $len);# . $pt;
355: print "Binary: '" . unpack("b*", $pt) . "'\n";
356: #print "PT: '$pt' - Length: " . length($pt) . "\n";
357: }
1.5 ! andrew 358: $pt = $C[0]->decrypt( $pt );
! 359: $pt = $C[1]->encrypt( $pt );
! 360: $pt = $C[2]->decrypt( $pt );
1.4 andrew 361: #print "PT: '$pt' - Length: " . length($pt) . "\n";
362: $cyphertext .= $pt;
363: }
364:
365: return substr ( $cyphertext, 0, $size );
1.2 andrew 366: }
1.1 andrew 367:
368: 1;
369: __END__
370:
371: =head1 AUTHOR
372:
373: Andrew Fresh E<lt>andrew@mad-techies.org<gt>
374:
375: =head1 SEE ALSO
376:
377: Palm::PDB(3)
378:
379: Palm::StdAppInfo(3)
380:
381: =cut
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