Annotation of palm/Palm-Keyring/lib/Palm/Keyring.pm, Revision 1.6
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: #
1.6 ! andrew 11: # $Id: Keyring.pm,v 1.5 2006/11/10 04:52:27 andrew Exp $
! 12: # $RedRiver: Keyring.pm,v 1.5 2006/11/10 04:52:27 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.
1.6 ! andrew 30: $VERSION = do { my @r = (q$Revision: 1.5 $ =~ /\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;
1.6 ! andrew 131: }
! 132:
! 133: sub Write
! 134: {
! 135: my $self = shift;
! 136: $self->Encrypt() || return undef;
! 137: return $self->SUPER::Load(@_);
1.1 andrew 138: }
139:
140: sub Encrypt
141: {
142: my $self = shift;
143: my $pass = shift;
144:
145: if ($pass) {
146: unless ($self->_keyring_verify($pass) ) {
147: # This would encrypt with a new password.
148: # First decrypting everything with the old password of course.
149: $self->_keyring_update($pass) || return undef;
150: $self->_keyring_verify($pass) || return undef;
151: }
152: }
153:
154: my $seen_enc_pass = 0;
155: foreach my $record (@{ $self->{records} }) {
156: unless ($seen_enc_pass) {
157: $seen_enc_pass = 1;
158: next;
159: }
160:
161: next unless defined $record->{plaintext};
162:
163: my $name = defined $record->{plaintext}->{name} ? $record->{plaintext}->{name} : '';
164: my $account = defined $record->{plaintext}->{account} ? $record->{plaintext}->{account} : '';
165: my $password = defined $record->{plaintext}->{password} ? $record->{plaintext}->{password} : '';
166: my $description = defined $record->{plaintext}->{description} ? $record->{plaintext}->{description} : '';
167: my $extra = '';
168:
1.2 andrew 169: my $plaintext = join("\000", $account, $password, $description, $extra);
1.1 andrew 170:
1.2 andrew 171: my $encrypted = $self->_crypt3des($plaintext, ENCRYPT);
1.1 andrew 172:
1.2 andrew 173: $record->{data} = join("\000", $name, $encrypted);
1.1 andrew 174: }
175:
176: return 1;
177: }
178:
179: sub Decrypt
180: {
181: my $self = shift;
182: my $pass = shift;
183:
184: if ($pass) {
185: $self->_keyring_verify($pass) || return undef;
186: }
187:
188: my $seen_enc_pass = 0;
189: foreach my $record (@{ $self->{records} }) {
190: unless ($seen_enc_pass) {
191: # need to skip the first record because it is the encrypted password
192: $seen_enc_pass = 1;
193: next;
194: }
195:
196: next unless defined $record->{data};
197:
1.2 andrew 198: my ($name, $encrypted) = split /\000/, $record->{data}, 2;
1.1 andrew 199: $record->{plaintext}->{name} = $name;
200:
1.2 andrew 201: my $decrypted = $self->_crypt3des($encrypted, DECRYPT);
1.1 andrew 202: my ($account, $password, $description, $extra)
1.2 andrew 203: = split /\000/, $decrypted, 4;
1.1 andrew 204:
205: $record->{plaintext}->{account} = defined $account ? $account : '';
206: $record->{plaintext}->{password} = defined $password ? $password : '';
207: $record->{plaintext}->{description} = defined $description ? $description : '';
208:
1.4 andrew 209: #print "Name: '$name'\n";
210: #print "Encrypted: '$encrypted' - Length: " . length($encrypted) . "\n";
1.2 andrew 211: #print "Hex: '" . unpack("H*", $encrypted) . "'\n";
212: #print "Binary: '" . unpack("b*", $encrypted) . "'\n";
1.4 andrew 213: #print "Decrypted: '$decrypted' - Length: " . length($decrypted) . "\n";
214: #print "Hex: '" . unpack("H*", $decrypted) . "'\n";
215: #print "Binary: '" . unpack("b*", $decrypted) . "'\n";
216: #print "\n";
1.1 andrew 217: #print "Extra: $extra\n";
218: #--------------------------------------------------
219: # print "Account: $account\n";
220: # print "Password: $password\n";
221: # print "Description: $description\n";
222: #--------------------------------------------------
223:
224: }
225:
226: return 1;
227: }
228:
229: sub _calc_keys
230: {
231: my $self = shift;
232:
233: my $pass = $self->{'password'};
234: die "No password defined!" unless defined $pass;
235:
236: my $digest = md5($pass);
237:
238: my ($key1, $key2) = unpack('a8a8', $digest);
239: #--------------------------------------------------
240: # print "key1: $key1: ", length $key1, "\n";
241: # print "key2: $key2: ", length $key2, "\n";
242: #--------------------------------------------------
243:
244: $digest = unpack('H*', $key1 . $key2 . $key1);
245: #--------------------------------------------------
246: # print "Digest: ", $digest, "\n";
247: # print length $digest, "\n";
248: #--------------------------------------------------
249:
250: $self->{digest} = $digest;
251: return $digest;
252: }
253:
254: sub _keyring_verify
255: {
256: my $self = shift;
257: my $pass = shift;
258:
1.4 andrew 259: die "No password specified!" unless $pass;
1.1 andrew 260: $self->{password} = $pass;
261:
262: # AFAIK the thing we use to test the password is
263: # always in the first entry
264: my $data = $self->{records}->[0]->{data};
265: #die "No encrypted password in file!" unless defined $data;
266: return undef unless defined $data;
267:
268: $data =~ s/\0$//;
269:
270: my $salt = substr($data, 0, $kSaltSize);
271:
272: my $msg = $salt . $pass;
273:
274: $msg .= "\0" x (MD5_CBLOCK - length($msg));
275:
276: my $digest = md5($msg);
277:
278: if ($data eq $salt . $digest) {
279: # May as well generate the keys we need now, since we know the password is right
280: if ($self->_calc_keys()) {
281: return 1;
282: } else {
283: return undef;
284: }
285: } else {
286: return undef;
287: }
288: }
289:
290: sub _keyring_update
291: {
292: # It is very important to Encrypt after calling this
293: # (Although it is generally only called by Encrypt)
294: # because otherwise the data will be out of sync with the
295: # password, and that would suck!
296: my $self = shift;
297: my $pass = shift;
298:
1.4 andrew 299: die "No password specified!" unless $pass;
1.1 andrew 300:
301: # if the database already has a password in it
302: if ($self->{records}->[0]->{data}) {
303: # Make sure everything is decrypted before we update the keyring
304: $self->Decrypt() || return undef;
305: }
306:
307: my $salt;
308: for (1..$kSaltSize) {
309: $salt .= chr(int(rand(255)));
310: }
311:
312: my $msg = $salt . $pass;
313:
314: $msg .= "\0" x (MD5_CBLOCK - length($msg));
315:
316: my $digest = md5($msg);
317:
318: my $data = $salt . $digest;# . "\0";
319:
320: # AFAIK the thing we use to test the password is
321: # always in the first entry
322: $self->{records}->[0]->{data} = $data;
323:
324: $self->{password} = $pass;
325: $self->_calc_keys();
326:
327: return 1;
328: }
329:
1.2 andrew 330:
331: # XXX Have to make this encrypt as well as decrypting, but w00 h00!
332: # do null padding on the end of a cleartext if we are going to encrypt it
333: sub _crypt3des {
1.4 andrew 334: my ( $self, $plaintext, $flag ) = @_;
1.2 andrew 335:
336: my $passphrase = $self->{digest} || $self->_calc_keys();
1.4 andrew 337: $passphrase .= ' ' x (16*3);
338: my $cyphertext = "";
1.2 andrew 339:
340:
1.4 andrew 341: my $size = length ( $plaintext );
342: #print "STRING: '$plaintext' - Length: " . length($plaintext) . "\n";
1.2 andrew 343:
1.4 andrew 344: # This check should see if it is plaintext first, if it is,
345: # pad it with \000
346: # if not, then die
347: die "record not 8 byte padded" if (length($plaintext) % 8) && ! $flag;
1.2 andrew 348:
1.5 andrew 349: my @C;
1.4 andrew 350: for ( 0..2 ) {
1.5 andrew 351: $C[$_] = new Crypt::DES( pack( "H*", substr($passphrase, 16*$_, 16 )));
1.4 andrew 352: }
353:
354: for ( 0 .. (($size)/8) - 1) {
355: my $pt = substr( $plaintext, $_*8, 8 );
356: #print "PT: '$pt' - Length: " . length($pt) . "\n";
357: if (length($pt) < 8) {
358: my $len = 8 - length($pt);
359: print "LENGTH: $len\n";
360: print "Binary: '" . unpack("b*", $pt) . "'\n";
361: $pt .= (chr(0) x $len);# . $pt;
362: print "Binary: '" . unpack("b*", $pt) . "'\n";
363: #print "PT: '$pt' - Length: " . length($pt) . "\n";
364: }
1.5 andrew 365: $pt = $C[0]->decrypt( $pt );
366: $pt = $C[1]->encrypt( $pt );
367: $pt = $C[2]->decrypt( $pt );
1.4 andrew 368: #print "PT: '$pt' - Length: " . length($pt) . "\n";
369: $cyphertext .= $pt;
370: }
371:
372: return substr ( $cyphertext, 0, $size );
1.2 andrew 373: }
1.1 andrew 374:
375: 1;
376: __END__
377:
378: =head1 AUTHOR
379:
380: Andrew Fresh E<lt>andrew@mad-techies.org<gt>
381:
382: =head1 SEE ALSO
383:
384: Palm::PDB(3)
385:
386: Palm::StdAppInfo(3)
387:
388: =cut
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