Paul Seamons > File-KeePass > File::KeePass

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NAME ^

File::KeePass - Interface to KeePass V1 and V2 database files

SYNOPSIS ^

    use File::KeePass;
    use Data::Dumper qw(Dumper);

    my $k = File::KeePass->new;

    # read a version 1 or version 2 database
    $k->load_db($file, $master_pass); # errors die

    print Dumper $k->header;
    print Dumper $k->groups; # passwords are locked

    $k->unlock;
    print Dumper $k->groups; # passwords are now visible

    $k->clear; # delete current db from memory


    my $group = $k->add_group({
        title => 'Foo',
    }); # root level group
    my $gid = $group->{'id'};

    my $group = $k->find_group({id => $gid});
    # OR
    my $group = $k->find_group({title => 'Foo'});


    my $group2 = $k->add_group({
        title => 'Bar',
        group => $gid,
        # OR group => $group,
    }); # nested group


    my $e = $k->add_entry({
        title    => 'Something',
        username => 'someuser',
        password => 'somepass',
        group    => $gid,
        # OR group => $group,
    });
    my $eid = $e->{'id'};

    my $e = $k->find_entry({id => $eid});
    # OR
    my $e = $k->find_entry({title => 'Something'});

    $k->lock;
    print $e->{'password'}; # eq undef
    print $k->locked_entry_password($e); # eq 'somepass'

    $k->unlock;
    print $e->{'password'}; # eq 'somepass'


    # save out a version 1 database
    $k->save_db("/some/file/location.kdb", $master_pass);

    # save out a version 2 database
    $k->save_db("/some/file/location.kdbx", $master_pass);

    # save out a version 1 database using a password and key file
    $k->save_db("/some/file/location.kdb", [$master_pass, $key_filename]);


    # read database from a file
    $k->parse_db($pass_db_string, $pass);

    # generate a keepass version 1 database string
    my $pass_db_string = $k->gen_db($pass);

    # generate a keepass version 2 database string
    my $pass_db_string = $k->gen_db($pass);

DESCRIPTION ^

File::KeePass gives access to KeePass version 1 (kdb) and version 2 (kdbx) databases.

The version 1 and version 2 databases are very different in construction, but the majority of information overlaps and many algorithms are similar. File::KeePass attempts to iron out as many of the differences.

File::KeePass gives nearly raw data access. There are a few utility methods for manipulating groups and entries. More advanced manipulation can easily be layered on top by other modules.

File::KeePass is only used for reading and writing databases and for keeping passwords scrambled while in memory. Programs dealing with UI or using of auto-type features are the domain of other modules on CPAN. File::KeePass::Agent is one example.

METHODS ^

new

Takes a hashref or hash of arguments. Returns a new File::KeePass object. Any named arguments are added to self.

load_db

Takes a kdb filename, a master password, and an optional argument hashref. Returns the File::KeePass object on success (can be called as a class method). Errors die. The resulting database can be accessed via various methods including $k->groups.

    my $k = File::KeePass->new;
    $k->load_db($file, $pwd);

    my $k = File::KeePass->load_db($file, $pwd);

    my $k = File::KeePass->load_db($file, $pwd, {auto_lock => 0});

The contents are read from file and passed to parse_db.

The password passed to load_db may be a composite key in any of the following forms:

    "password"                   # password only
    ["password"]                 # same
    ["password", "keyfilename"]  # password and key file
    [undef, "keyfilename"]       # key file only
    ["password", \"keycontent"]  # password and reference to key file content
    [undef, \"keycontent"]       # reference to key file content only

The key file is optional. It may be passed as a filename, or as a scalar reference to the contents of the key file. If a filename is passed it will be read in. The key file can contain any of the following three types:

    length 32         # treated as raw key
    length 64         # must be 64 hexidecimal characters
    any-other-length  # a SHA256 sum will be taken of the data
save_db

Takes a kdb filename and a master password. Stores out the current groups in the object. Writes attempt to write first to $file.new.$epoch and are then renamed into the correct location.

You will need to unlock the db via $k->unlock before calling this method if the database is currently locked.

The same master password types passed to load_db can be used here.

parse_db

Takes a string or a reference to a string containting an encrypted kdb database, a master password, and an optional argument hashref. Returns the File::KeePass object on success (can be called as a class method). Errors die. The resulting database can be accessed via various methods including $k->groups.

    my $k = File::KeePass->new;
    $k->parse_db($loaded_kdb, $pwd);

    my $k = File::KeePass->parse_db($kdb_buffer, $pwd);

    my $k = File::KeePass->parse_db($kdb_buffer, $pwd, {auto_lock => 0});

The same master password types passed to load_db can be used here.

parse_header

Used by parse_db. Reads just the header information. Can be used as a basic KeePass file check. The returned hash will contain version => 1 or version => 2 depending upon which type of header is found. Can be called as a class method.

    my $head = File::KeePass->parse_header($kdb_buffer); # errors die
    printf "This is a version %d database\n", $head->{'version'};
gen_db

Takes a master password. Optionally takes a "groups" arrayref and a "headers" hashref. If groups are not passed, it defaults to using the currently loaded groups. If headers are not passed, a fresh set of headers are generated based on the groups and the master password. The headers can be passed in to test round trip portability.

You will need to unlock the db via $k->unlock before calling this method if the database is currently locked.

The same master password types passed to load_db can be used here.

header

Returns a hashref representing the combined current header and meta information for the currently loaded database.

The following fields are present in both version 1 and version 2 style databases (from the header):

    enc_iv               => "123456789123456", # rand
    enc_type             => "rijndael",
    header_size          => 222,
    seed_key             => "1234567890123456", # rand (32 bytes on v2)
    seed_rand            => "12345678901234567890123456789012", # rand
    rounds               => 6000,
    sig1                 => "2594363651",
    sig2                 => "3041655655", # indicates db version
    ver                  => 196608,
    version              => 1, # or 2

The following keys will be present after the reading of a version 2 database (from the header):

    cipher               => "aes",
    compression          => 1,
    protected_stream     => "salsa20",
    protected_stream_key => "12345678901234567890123456789012", # rand
    start_bytes          => "12345678901234567890123456789012", # rand

Additionally, items parsed from the Meta section of a version 2 database will be added. The following are the available fields.

    color                         => "#4FFF00",
    custom_data                   => {key1 => "val1"},
    database_description          => "database desc",
    database_description_changed  => "2012-08-17 00:30:56",
    database_name                 => "database name",
    database_name_changed         => "2012-08-17 00:30:56",
    default_user_name             => "",
    default_user_name_changed     => "2012-08-17 00:30:34",
    entry_templates_group         => "VL5nOpzlFUevGhqL71/OTA==",
    entry_templates_group_changed => "2012-08-21 14:05:32",
    generator                     => "KeePass",
    history_max_items             => 10,
    history_max_size              => 6291456, # bytes
    last_selected_group           => "SUgL30QQqUK3tOWuNKUYJA==",
    last_top_visible_group        => "dC1sQ1NO80W7klmRhfEUVw==",
    maintenance_history_days      => 365,
    master_key_change_force       => -1,
    master_key_change_rec         => -1,
    master_key_changed            => "2012-08-17 00:30:34",
    protect_notes                 => 0,
    protect_password              => 1,
    protect_title                 => 0,
    protect_url                   => 0,
    protect_username              => 0
    recycle_bin_changed           => "2012-08-17 00:30:34",
    recycle_bin_enabled           => 1,
    recycle_bin_uuid              => "SUgL30QQqUK3tOWuNKUYJA=="

When writing a database via either save_db or gen_db, these fields can be set and passed along. Optionally, it is possible to pass along a key called reuse_header to let calls to save_db and gen_db automatically use the contents of the previous header.

clear

Clears any currently loaded database.

auto_lock

Default true. If true, passwords are automatically hidden when a database loaded via parse_db or load_db.

    $k->auto_lock(0); # turn off auto locking
is_locked

Returns true if the current database is locked.

lock

Locks the database. This moves all passwords into a protected, in memory, encrypted storage location. Returns 1 on success. Returns 2 if the db is already locked. If a database is loaded via parse_db or load_db and auto_lock is true, the newly loaded database will start out locked.

unlock

Unlocks a previously locked database. You will need to unlock a database before calling save_db or gen_db.

GROUP/ENTRY METHODS ^

dump_groups

Returns a simplified string representation of the currently loaded database.

    print $k->dump_groups;

You can optionally pass a match argument hashref. Only entries matching the criteria will be returned.

groups

Returns an arrayref of groups from the currently loaded database. Groups returned will be hierarchal. Note, groups simply returns a reference to all of the data. It makes no attempts at cleaning up the data (find_groups will make sure the data is groomed).

    my $g = $k->groups;

Groups will look similar to the following:

    $g = [{
         expanded => 0,
         icon     => 0,
         id       => 234234234, # under v1 this is a 32 bit int, under v2 it is a 16 char id
         title    => 'Foo',
         level    => 0,
         entries => [{
             accessed => "2010-06-24 15:09:19",
             comment  => "",
             created  => "2010-06-24 15:09:19",
             expires  => "2999-12-31 23:23:59",
             icon     => 0,
             modified => "2010-06-24 15:09:19",
             title    => "Something",
             password => 'somepass', # will be hidden if the database is locked
             url      => "",
             username => "someuser",
             id       => "0a55ac30af68149f", # v1 is any hex char, v2 is any 16 char
         }],
         groups => [{
             expanded => 0,
             icon     => 0,
             id       => 994414667,
             level    => 1,
             title    => "Bar"
         }],
     }];
add_group

Adds a new group to the database. Returns a reference to the new group. If a database isn't loaded, it begins a new one. Takes a hashref of arguments for the new entry including title, icon, expanded. A new random group id will be generated. An optional group argument can be passed. If a group is passed the new group will be added under that parent group.

    my $group = $k->add_group({title => 'Foo'});
    my $gid = $group->{'id'};

    my $group2 = $k->add_group({title => 'Bar', group => $gid});

The group argument's value may also be a reference to a group - such as that returned by find_group.

finder_tests {

Used by find_groups and find_entries. Takes a hashref of arguments and returns a list of test code refs.

    {title => 'Foo'} # will check if title equals Foo
    {'title !' => 'Foo'} # will check if title does not equal Foo
    {'title =~' => qr{^Foo$}} # will check if title does matches the regex
    {'title !~' => qr{^Foo$}} # will check if title does not match the regex
find_groups

Takes a hashref of search criteria and returns all matching groups. Can be passed id, title, icon, and level. Search arguments will be parsed by finder_tests.

    my @groups = $k->find_groups({title => 'Foo'});

    my @all_groups_flattened = $k->find_groups({});

The find_groups method also checks to make sure group ids are unique and that all needed values are defined.

find_group

Calls find_groups and returns the first group found. Dies if multiple results are found. In scalar context it returns only the group. In list context it returns the group, and its the arrayref in which it is stored (either the root level group or a sub groups group item).

delete_group

Passes arguments to find_group to find the group to delete. Then deletes the group. Returns the group that was just deleted.

add_entry

Adds a new entry to the database. Returns a reference to the new entry. An optional group argument can be passed. If a group is not passed, the entry will be added to the first group in the database. A new entry id will be created if one is not passed or if it conflicts with an existing group.

The following fields can be passed to both v1 and v2 databases.

    accessed => "2010-06-24 15:09:19", # last accessed date
    auto_type => [{keys => "{USERNAME}{TAB}{PASSWORD}{ENTER}", window => "Foo*"}],
    binary   => {foo => 'content'}; # hashref of filename/content pairs
    comment  => "", # a comment for the system - auto-type info is normally here
    created  => "2010-06-24 15:09:19", # entry creation date
    expires  => "2999-12-31 23:23:59", # date entry expires
    icon     => 0, # icon number for use with agents
    modified => "2010-06-24 15:09:19", # last modified
    title    => "Something",
    password => 'somepass', # will be hidden if the database is locked
    url      => "http://",
    username => "someuser",
    id       => "0a55ac30af68149f", # auto generated if needed, v1 is any hex char, v2 is any 16 char
    group    => $gid, # which group to add the entry to

For compatibility with earlier versions of File::KeePass, it is possible to pass in a binary and binary_name when creating an entry. They will be automatically converted to the hashref of filename/content pairs

    binary_name => "foo", # description of the stored binary - typically a filename
    binary   => "content", # raw data to be stored in the system - typically a file

    # results in
    binary => {"foo" => "content"}

Typically, version 1 databases store their Auto-Type information inside of the comment. They are also limited to having only one key sequence per entry. File::KeePass 2+ will automatically parse Auto-Type values passed in the entry comment and store them out as the auto_type arrayref. This arrayref is serialized back into the comment section when saving as a version 1 database. Version 2 databases have a separate storage mechanism for Auto-Type.

    If you passed in:
    comment => "
       Auto-Type: {USERNAME}{TAB}{PASSWORD}{ENTER}
       Auto-Type-Window: Foo*
       Auto-Type-Window: Bar*
    ",

    Will result in:
    auto_type => [{
        keys => "{USERNAME}{TAB}{PASSWORD}{ENTER}",
        window => "Foo*"
     }, {
        keys => "{USERNAME}{TAB}{PASSWORD}{ENTER}",
        window => "Bar*"
     }],

The group argument value may be either an existing group id, or a reference to a group - such as that returned by find_group.

When using a version 2 database, the following additional fields are also available:

    expires_enabled   => 0,
    location_changed  => "2012-08-05 12:12:12",
    usage_count       => 0,
    tags              => {},
    background_color  => '#ff0000',
    foreground_color  => '#ffffff',
    custom_icon_uuid  => '234242342aa',
    history           => [], # arrayref of previous entry changes
    override_url      => $node->{'OverrideURL'},
    auto_type_enabled => 1,
    auto_type_munge   => 0, # whether or not to attempt two channel auto typing
    protected         => {password => 1}, # indicating which strings were/should be salsa20 protected
    strings           => {'other key' => 'other value'},
find_entries

Takes a hashref of search criteria and returns all matching groups. Can be passed an entry id, title, username, comment, url, active, group_id, group_title, or any other entry property. Search arguments will be parsed by finder_tests.

    my @entries = $k->find_entries({title => 'Something'});

    my @all_entries_flattened = $k->find_entries({});
find_entry

Calls find_entries and returns the first entry found. Dies if multiple results are found. In scalar context it returns only the entry. In list context it returns the entry, and its group.

delete_entry

Passes arguments to find_entry to find the entry to delete. Then deletes the entry. Returns the entry that was just deleted.

locked_entry_password

Allows access to individual passwords for a database that is locked. Dies if the database is not locked.

UTILITY METHODS ^

The following methods are general purpose methods used during the parsing and generating of kdb databases.

now

Returns the current localtime datetime stamp.

default_exp

Returns the string representing the default expires time of an entry. Will use $self->{'default_exp'} or fails to the string '2999-12-31 23:23:59'.

decrypt_rijndael_cbc

Takes an encrypted string, a key, and an encryption_iv string. Returns a plaintext string.

encrypt_rijndael_cbc

Takes a plaintext string, a key, and an encryption_iv string. Returns an encrypted string.

decode_base64

Loads the MIME::Base64 library and decodes the passed string.

encode_base64

Loads the MIME::Base64 library and encodes the passed string.

unchunksum

Parses and reassembles a buffer, reading in lengths, and checksums of chunks.

decompress

Loads the Compress::Raw::Zlib library and inflates the contents.

compress

Loads the Compress::Raw::Zlib library and deflates the contents.

parse_xml

Loads the XML::Parser library and sets up a basic parser that can call hooks at various events. Without the hooks, it runs similarly to XML::Simple::parse.

    my $data = $self->parse_xml($buffer, {
        top            => 'KeePassFile',
        force_array    => {Group => 1, Entry => 1},
        start_handlers => {Group => sub { $level++ }},
        end_handlers   => {Group => sub { $level-- }},
    });
gen_xml

Generates XML from the passed data structure. The output of parse_xml can be passed as is. Additionally hints such as __sort__ can be used to order the tags of a node and __attr__ can be used to indicate which items of a node are attributes.

salsa20

Takes a hashref containing a salsa20 key string (length 32 or 16), a salsa20 iv string (length 8), number of salsa20 rounds (8, 12, or 20 - default 20), and an optional data string. The key and iv are used to initialize the salsa20 encryption.

If a data string is passed, the string is salsa20 encrypted and returned.

If no data string is passed a salsa20 encrypting coderef is returned.

    my $encoded = $self->salsa20({key => $key, iv => $iv, data => $data});
    my $uncoded = $self->salsa20({key => $key, iv => $iv, data => $encoded});
    # $data eq $uncoded

    my $encoder = $self->salsa20({key => $key, iv => $Iv}); # no data
    my $encoded = $encoder->($data);
    my $part2   = $encoder->($more_data); # continues from previous state
salsa20_stream

Takes a hashref that will be passed to salsa20. Uses the resulting encoder to generate a more continuous encoded stream. The salsa20 method encodes in chunks of 64 bytes. If a string is not a multiple of 64, then some of the xor bytes are unused. The salsa20_stream method maintains a buffer of xor bytes to ensure that none are wasted.

    my $encoder = $self->salsa20_stream({key => $key, iv => $Iv}); # no data
    my $encoded = $encoder->("1234");   # calls salsa20->()
    my $part2   = $encoder->("1234");   # uses the same pad until 64 bytes are used

OTHER METHODS ^

_parse_v1_header
_parse_v1_body
_parse_v1_groups
_parse_v1_entries
_parse_v1_date

Utilities used for parsing version 1 type databases.

_parse_v2_header
_parse_v2_body
_parse_v2_date

Utilities used for parsing version 2 type databases.

_gen_v1_db
_gen_v1_header
_gen_v1_date

Utilities used to generate version 1 type databases.

_gen_v2_db
_gen_v2_header
_gen_v2_date

Utilities used to generate version 2 type databases.

_master_key

Takes the password and parsed headers. Returns the master key based on database type.

ONE LINERS ^

(Long one liners)

Here is a version 1 to version 2, or version 2 to version 1 converter. Simply change the extension of the two files. Someday we will include a kdb2kdbx utility to do this for you.

    perl -MFile::KeePass -e 'use IO::Prompt; $p="".prompt("Pass:",-e=>"*",-tty); File::KeePass->load_db(+shift,$p,{auto_lock=>0})->save_db(+shift,$p)' ~/test.kdb ~/test.kdbx

    # OR using graphical prompt
    perl -MFile::KeePass -e 'chop($p=`zenity --password`); File::KeePass->load_db(+shift,$p,{auto_lock=>0})->save_db(+shift,$p)' ~/test.kdbx ~/test.kdb

    # OR using pure perl (but echoes password)
    perl -MFile::KeePass -e 'print "Pass:"; chop($p=<STDIN>); File::KeePass->load_db(+shift,$p,{auto_lock=>0})->save_db(+shift,$p)' ~/test.kdbx ~/test.kdb

Dumping the XML from a version 2 database.

    perl -MFile::KeePass -e 'chop($p=`zenity --password`); print File::KeePass->load_db(+shift,$p,{keep_xml=>1})->{xml_in},"\n"' ~/test.kdbx

Outlining group information.

    perl -MFile::KeePass -e 'chop($p=`zenity --password`); print File::KeePass->load_db(+shift,$p)->dump_groups' ~/test.kdbx

Dumping header information

    perl -MFile::KeePass -MData::Dumper -e 'chop($p=`zenity --password`); print Dumper +File::KeePass->load_db(+shift,$p)->header' ~/test.kdbx

BUGS ^

Only Rijndael is supported when using v1 databases.

This module makes no attempt to act as a password agent. That is the job of File::KeePass::Agent. This isn't really a bug but some people will think it is.

Groups and entries don't have true objects associated with them. At the moment this is by design. The data is kept as plain boring data.

SOURCES ^

Knowledge about the algorithms necessary to decode a KeePass DB v1 format was gleaned from the source code of keepassx-0.4.3. That source code is published under the GPL2 license. KeePassX 0.4.3 bears the copyright of

    Copyright (C) 2005-2008 Tarek Saidi <tarek.saidi@arcor.de>
    Copyright (C) 2007-2009 Felix Geyer <debfx-keepassx {at} fobos.de>

Knowledge about the algorithms necessary to decode a KeePass DB v2 format was gleaned from the source code of keepassx-2.0-alpha1. That source code is published under the GPL2 or GPL3 license. KeePassX 2.0-alpha1 bears the copyright of

    Copyright: 2010-2012, Felix Geyer <debfx@fobos.de>
               2011-2012, Florian Geyer <blueice@fobos.de>

The salsa20 algorithm is based on http://cr.yp.to/snuffle/salsa20/regs/salsa20.c which is listed as Public domain (D. J. Bernstein).

The ordering and layering of encryption/decryption algorithms of File::KeePass are of derivative nature from KeePassX and could not have been created without this insight - though the perl code is from scratch.

AUTHOR ^

Paul Seamons <paul@seamons.com>

LICENSE ^

This module may be distributed under the same terms as Perl itself.

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