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# IRCrypt: Secure Encryption Layer Atop IRC
# =========================================
# SPDX-FileCopyrightText: 2013-2014 Lars Kiesow <lkiesow@uos.de>
# SPDX-FileCopyrightText: 2013-2014 Sven Haardiek <sven@haardiek.de>
# SPDX-License-Identifier: GPL-3.0-or-later
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 3 of the License, or
# (at your option) any later version.
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software Foundation,
# Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301  USA
# == About ==================================================================
#  The weechat IRCrypt plug-in will send messages encrypted to all channels for
#  which a passphrase is set. A channel can either be a regular IRC multi-user
#  channel (i.e. #IRCrypt) or another users nickname.
# == Project ================================================================
# This plug-in is part of the IRCrypt project. For mor information or to
# participate, please visit
#   https://github.com/IRCrypt
# To report bugs, make suggestions, etc. for this particular plug-in, please
# have a look at:
#   https://github.com/IRCrypt/ircrypt-weechat
import weechat, string, os, subprocess, base64, time
# Constants used in this script
SCRIPT_NAME    = 'ircrypt'
SCRIPT_AUTHOR  = 'Sven Haardiek <sven@haardiek.de>, Lars Kiesow <lkiesow@uos.de>'
SCRIPT_VERSION = '1.0.1'
SCRIPT_LICENSE = 'GPL3'
SCRIPT_DESC    = 'IRCrypt: Encryption layer for IRC'
SCRIPT_HELP_TEXT = '''
%(bold)sIRCrypt command options: %(normal)s
list                                                    List set keys, public key ids and ciphers
set-key            [-server <server>] <target> <key>    Set key for target
remove-key         [-server <server>] <target>          Remove key for target
set-cipher         [-server <server>] <target> <cipher> Set specific cipher for target
remove-cipher      [-server <server>] <target>          Remove specific cipher for target
plain              [-server <s>] [-channel <ch>] <msg>  Send unencrypted message
%(bold)sExamples: %(normal)s
Set the key for a channel:
   /ircrypt set-key -server freenet #IRCrypt key
Remove the key:
   /ircrypt remove-key #IRCrypt
Switch to a specific cipher for a channel:
   /ircrypt set-cipher -server freenode #IRCrypt TWOFISH
Unset the specific cipher for a channel:
   /ircrypt remove-cipher #IRCrypt
Send unencrypted “Hello” to current channel
   /ircrypt plain Hello
%(bold)sConfiguration: %(normal)s
Tip: You can list all options and what they are currently set to by executing:
   /set ircrypt.*
%(bold)sircrypt.marker.encrypted %(normal)s
   If you add 'ircrypt' to weechat.bar.status.items, these option will set a
   string which is displayed in the status bar of an encrypted channels,
   indicating that the current channel is encrypted.
   If “{{cipher}}” is used as part of this string, it will be replaced by the
   cipher currently used by oneself for that particular channel.
   It is woth noting that you probably don't want to replace the whole value of
   that option but extend it instead in a way like:
      /set weechat.bar.status.items {{currentContent}},ircrypt
%(bold)sircrypt.marker.unencrypted %(normal)s
   This option will set a string which is displayed before each message that is
   send unencrypted in a channel for which a key is set. So you know when
   someone is talking to you without encryption.
%(bold)sircrypt.general.binary %(normal)s
   This will set the GnuPG binary used for encryption and decryption. IRCrypt
   will try to set this automatically.
''' % {'bold':weechat.color('bold'), 'normal':weechat.color('-bold')}
MAX_PART_LEN     = 300
MSG_PART_TIMEOUT = 300 # 5min
# Global variables and memory used to store message parts, pending requests,
# configuration options, keys, etc.
ircrypt_msg_memory       = {}
ircrypt_config_file      = None
ircrypt_config_section   = {}
ircrypt_config_option    = {}
ircrypt_keys             = {}
ircrypt_cipher           = {}
ircrypt_message_plain    = {}
class MessageParts:
    '''Class used for storing parts of messages which were split after
    encryption due to their length.'''
    modified = 0
    last_id  = None
    message  = ''
    def update(self, id, msg):
        '''This method updates an already existing message part by adding a new
        part to the old ones and updating the identifier of the latest received
        message part.
        '''
        # Check if id is correct. If not, throw away old parts:
        if self.last_id and self.last_id != id+1:
            self.message = ''
        # Check if the are old message parts which belong due to their old age
        # probably not to this message:
        if time.time() - self.modified > MSG_PART_TIMEOUT:
            self.message = ''
        self.last_id = id
        self.message = msg + self.message
        self.modified = time.time()
def ircrypt_gnupg(stdin, *args):
    '''Try to execute gpg with given input and options.
    :param stdin: Input for GnuPG
    :param  args: Additional command line options for GnuPG
    :returns:     Tuple containing returncode, stdout and stderr
    gnupg = weechat.config_string(weechat.config_get('ircrypt.general.binary'))
    if not gnupg:
        return (99, '', 'GnuPG could not be found')
    p = subprocess.Popen(
            [gnupg, '--batch',  '--no-tty'] + list(args),
            stdin=subprocess.PIPE, stdout=subprocess.PIPE, stderr=subprocess.PIPE)
    out, err = p.communicate(stdin)
    return (p.returncode, out, err)
def ircrypt_split_msg(cmd, pre, msg):
    '''Convert encrypted message in MAX_PART_LEN sized blocks
    msg = msg.rstrip()
    return '\n'.join(['%s:>%s-%i %s' %
        (cmd, pre, i // MAX_PART_LEN, msg[i:i+MAX_PART_LEN])
        for i in range(0, len(msg), MAX_PART_LEN)][::-1])
def ircrypt_error(msg, buf):
    '''Print errors to a given buffer. Errors are printed in red and have the
    weechat error prefix.
    weechat.prnt(buf, weechat.prefix('error') + weechat.color('red') +
            ('\n' + weechat.color('red')).join(msg.split('\n')))
def ircrypt_warn(msg, buf=''):
    '''Print warnings. If no buffer is set, the default weechat buffer is used.
    Warnin are printed in gray without marker.
    weechat.prnt(buf, weechat.color('gray') +
            ('\n' + weechat.color('gray')).join(msg.split('\n')))
def ircrypt_info(msg, buf=None):
    '''Print ifo message to specified buffer. If no buffer is set, the current
    foreground buffer is used to print the message.
    if buf is None:
        buf = weechat.current_buffer()
    weechat.prnt(buf, msg)
def ircrypt_decrypt_hook(data, msgtype, server, args):
    '''Hook for incomming PRVMSG commands.
    This method will parse the input, check if it is an encrypted message and
    call the appropriate decryption methods if necessary.
    :param data:
    :param msgtype:
    :param server: IRC server the message comes from.
    :param args: IRC command line-
    info = weechat.info_get_hashtable('irc_message_parse', { 'message': args })
    # Check if channel is own nick and if change channel to nick of sender
    if info['channel'][0] not in '#&':
        info['channel'] = info['nick']
    # Get key
    key = ircrypt_keys.get(('%s/%s' % (server, info['channel'])).lower())
    # Return everything as it is if we have no key
    if not key:
        return args
    if not '>CRY-' in args:
        # if key exisits and no >CRY not part of message flag message as unencrypted
        pre, message = args.split(' :', 1)
        marker = weechat.config_string(ircrypt_config_option['unencrypted'])
        return '%s :%s %s' % (pre, marker, message)
    # if key exists and >CRY part of message start symmetric encryption
    pre, message    = args.split('>CRY-', 1)
    number, message = message.split(' ', 1 )
    # Get key for the message memory
    catchword = '%s.%s.%s' % (server, info['channel'], info['nick'])
    # Decrypt only if we got last part of the message
    # otherwise put the message into a global memory and quit
    if int(number) != 0:
        if not catchword in ircrypt_msg_memory:
            ircrypt_msg_memory[catchword] = MessageParts()
        ircrypt_msg_memory[catchword].update(int(number), message)
        return ''
    # Get whole message
        message = message + ircrypt_msg_memory[catchword].message
        del ircrypt_msg_memory[catchword]
    except KeyError:
        pass
    # Get message buffer in case we need to print an error
    buf = weechat.buffer_search('irc', '%s.%s' % (server,info['channel']))
    # Decode base64 encoded message
        message = base64.b64decode(message)
    except:
        ircrypt_error('Could not Base64 decode message.', buf)
        return args
    # Decrypt
        message = (key).encode('utf-8') + b'\n' + message
    except:
        # For Python 2.x
        message = key + b'\n' + message
    (ret, out, err) = ircrypt_gnupg(message,
            '--passphrase-fd', '-', '-q', '-d')
    # Get and print GPG errors/warnings
    if ret:
        ircrypt_error(err.decode('utf-8'), buf)
        return args
    if err:
        ircrypt_warn(err.decode('utf-8'))
    return pre + out.decode('utf-8')
def ircrypt_encrypt_hook(data, msgtype, server, args):
    '''Hook for outgoing PRVMSG commands.
    This method will call the appropriate methods for encrypting the outgoing
    messages either symmetric or asymmetric
    :param data:
    :param msgtype:
    :param server: IRC server the message comes from.
    :param args: IRC command line-
    info = weechat.info_get_hashtable("irc_message_parse", { "message": args })
    # check if this message is to be send as plain text
    plain = ircrypt_message_plain.get('%s/%s' % (server, info['channel']))
    if plain:
        del ircrypt_message_plain['%s/%s' % (server, info['channel'])]
        if (plain[0] - time.time()) < 5 \
                and args == 'PRIVMSG %s :%s' % (info['channel'], plain[1]):
            args = args.replace('PRIVMSG %s :%s ' % (
                info['channel'],
                weechat.config_string(ircrypt_config_option['unencrypted'])),
                'PRIVMSG %s :' % info['channel'])
            return args
    # check symmetric key
    key = ircrypt_keys.get(('%s/%s' % (server, info['channel'])).lower())
    if not key:
        # No key -> don't encrypt
        return args
    # Get cipher
    cipher = ircrypt_cipher.get(('%s/%s' % (server, info['channel'])).lower(),
            weechat.config_string(ircrypt_config_option['sym_cipher']))
    # Get prefix and message
    pre, message = args.split(':', 1)
    # encrypt message
        inp = key.encode('utf-8') + b'\n' + message.encode('utf-8')
    except:
        inp = key + b'\n' + message
    (ret, out, err) = ircrypt_gnupg(inp,
            '--symmetric', '--cipher-algo', cipher, '--passphrase-fd', '-')
    # Get and print GPG errors/warnings
    if ret:
        buf = weechat.buffer_search('irc', '%s.%s' % (server, info['channel']))
        ircrypt_error(err.decode('utf-8'), buf)
        return args
    if err:
        ircrypt_warn(err.decode('utf-8'))
    # Ensure the generated messages are not too long and send them
    return ircrypt_split_msg(pre, 'CRY', base64.b64encode(out).decode('utf-8'))
def ircrypt_config_init():
    ''' This method initializes the configuration file. It creates sections and
    options in memory and prepares the handling of key sections.
    global ircrypt_config_file
    ircrypt_config_file = weechat.config_new('ircrypt', 'ircrypt_config_reload_cb', '')
    if not ircrypt_config_file:
        return
    # marker
    ircrypt_config_section['marker'] = weechat.config_new_section(
            ircrypt_config_file, 'marker', 0, 0, '', '', '', '', '', '', '', '',
            '', '')
    if not ircrypt_config_section['marker']:
        weechat.config_free(ircrypt_config_file)
        return
    ircrypt_config_option['encrypted'] = weechat.config_new_option(
            ircrypt_config_file, ircrypt_config_section['marker'],
            'encrypted', 'string', 'Marker for encrypted messages', '', 0, 0,
            'encrypted', 'encrypted', 0, '', '', '', '', '', '')
    ircrypt_config_option['unencrypted'] = weechat.config_new_option(
            ircrypt_config_file, ircrypt_config_section['marker'], 'unencrypted',
            'string', 'Marker for unencrypted messages received in an encrypted channel',
            '', 0, 0, '', 'u', 0, '', '', '', '', '', '')
    # cipher options
    ircrypt_config_section['cipher'] = weechat.config_new_section(
            ircrypt_config_file, 'cipher', 0, 0, '', '', '', '', '', '', '', '',
            '', '')
    if not ircrypt_config_section['cipher']:
        weechat.config_free(ircrypt_config_file)
        return
    ircrypt_config_option['sym_cipher'] = weechat.config_new_option(
            ircrypt_config_file, ircrypt_config_section['cipher'],
            'sym_cipher', 'string', 'symmetric cipher used by default', '', 0, 0,
            'TWOFISH', 'TWOFISH', 0, '', '', '', '', '', '')
    # general options
    ircrypt_config_section['general'] = weechat.config_new_section(
            ircrypt_config_file, 'general', 0, 0, '', '', '', '', '', '', '', '',
            '', '')
    if not ircrypt_config_section['general']:
        weechat.config_free(ircrypt_config_file)
        return
    ircrypt_config_option['binary'] = weechat.config_new_option(
            ircrypt_config_file, ircrypt_config_section['general'],
            'binary', 'string', 'GnuPG binary to use', '', 0, 0,
            '', '', 0, '', '', '', '', '', '')
    ircrypt_config_section['keys'] = weechat.config_new_section(
            ircrypt_config_file, 'keys', 0, 0, 'ircrypt_config_keys_read_cb', '',
            'ircrypt_config_keys_write_cb', '', '', '', '', '', '', '')
    if not ircrypt_config_section['keys']:
        weechat.config_free(ircrypt_config_file)
    # Special Ciphers
    ircrypt_config_section['special_cipher'] = weechat.config_new_section(
            ircrypt_config_file, 'special_cipher', 0, 0,
            'ircrypt_config_special_cipher_read_cb', '',
            'ircrypt_config_special_cipher_write_cb', '', '', '', '', '', '', '')
    if not ircrypt_config_section['special_cipher']:
        weechat.config_free(ircrypt_config_file)
def ircrypt_config_reload_cb(data, config_file):
    '''Handle a reload of the configuration file.
    global ircrypt_keys, ircrypt_cipher
    # Forget Keys and ciphers to make sure they are properly reloaded and no old
    # ones are left
    ircrypt_keys   = {}
    ircrypt_cipher = {}
    return weechat.config_reload(config_file)
def ircrypt_config_read():
    ''' Read IRCrypt configuration file (ircrypt.conf).
    return weechat.config_read(ircrypt_config_file)
def ircrypt_config_write():
    ''' Write IRCrypt configuration file (ircrypt.conf) to disk.
    return weechat.config_write(ircrypt_config_file)
def ircrypt_config_keys_read_cb(data, config_file, section_name, option_name,
        value):
    '''Read elements of the key section from the configuration file.
    ircrypt_keys[option_name.lower()] = value
    return weechat.WEECHAT_CONFIG_OPTION_SET_OK_CHANGED
def ircrypt_config_keys_write_cb(data, config_file, section_name):
    '''Write passphrases to the key section of the configuration file.
    weechat.config_write_line(config_file, section_name, '')
    for target, key in sorted(list(ircrypt_keys.items())):
        weechat.config_write_line(config_file, target.lower(), key)
    return weechat.WEECHAT_RC_OK
def ircrypt_config_special_cipher_read_cb(data, config_file, section_name,
        option_name, value):
    '''Read elements of the key section from the configuration file.
    ircrypt_cipher[option_name.lower()] = value
    return weechat.WEECHAT_CONFIG_OPTION_SET_OK_CHANGED
def ircrypt_config_special_cipher_write_cb(data, config_file, section_name):
    '''Write passphrases to the key section of the configuration file.
    weechat.config_write_line(config_file, section_name, '')
    for target, cipher in sorted(list(ircrypt_cipher.items())):
        weechat.config_write_line(config_file, target.lower(), cipher)
    return weechat.WEECHAT_RC_OK
def ircrypt_command_list():
    '''List set keys and channel specific ciphers.
    # List keys
    keys = '\n'.join([' %s : %s' % x for x in ircrypt_keys.items()])
    ircrypt_info('Symmetric Keys:\n' + keys if keys else 'No symmetric keys set')
    # List channel specific ciphers
    ciphers = '\n'.join([' %s : %s' % x for x in ircrypt_cipher.items()])
    ircrypt_info('Special ciphers:\n' + ciphers if ciphers
            else 'No special ciphers set')
    return weechat.WEECHAT_RC_OK
def ircrypt_command_set_keys(target, key):
    '''Set key for target.
    :param target: server/channel combination
    :param key: Key to use for target
    ircrypt_keys[target.lower()] = key
    ircrypt_info('Set key for %s' % target)
    return weechat.WEECHAT_RC_OK
def ircrypt_command_remove_keys(target):
    '''Remove key for target.
    :param target: server/channel combination
        del ircrypt_keys[target.lower()]
        ircrypt_info('Removed key for %s' % target)
    except KeyError:
        ircrypt_info('No existing key for %s.' % target)
    return weechat.WEECHAT_RC_OK
def ircrypt_command_set_cip(target, cipher):
    '''Set cipher for target.
    :param target: server/channel combination
    :param cipher: Cipher to use for target
    ircrypt_cipher[target.lower()] = cipher
    ircrypt_info('Set cipher %s for %s' % (cipher, target))
    return weechat.WEECHAT_RC_OK
def ircrypt_command_remove_cip(target):
    '''Remove cipher for target.
    :param target: server/channel combination
        del ircrypt_cipher[target.lower()]
        ircrypt_info('Removed special cipher. Using default cipher for %s instead.' % target)
    except KeyError:
        ircrypt_info('No special cipher set for %s.' % target)
    return weechat.WEECHAT_RC_OK
def ircrypt_command_plain(buffer, server, args, argv):
    '''Send unencrypted message
    channel = ''
    if (len(argv) > 2 and argv[1] == '-channel'):
        channel = argv[2]
        args = (args.split(' ', 2)+[''])[2]
        # Try to determine the server automatically
        channel = weechat.buffer_get_string(buffer, 'localvar_channel')
    # If there is no text, just ignore the command
    if not args:
        return weechat.WEECHAT_RC_OK
    marker = weechat.config_string(ircrypt_config_option['unencrypted'])
    msg = marker + ' ' + args.split(' ', 1)[-1]
    ircrypt_message_plain['%s/%s' % (server, channel)] = (time.time(), msg)
    weechat.command('','/msg -server %s %s %s' % \
            (server, channel, msg))
    return weechat.WEECHAT_RC_OK
def ircrypt_command(data, buffer, args):
    '''Hook to handle the /ircrypt weechat command.
    argv = args.split()
    if not argv or argv == ['list']:
        return ircrypt_command_list()
    # Check if a server was set
    if (len(argv) > 2 and argv[1] == '-server'):
        server = argv[2]
        del argv[1:3]
        args = (args.split(' ', 2)+[''])[2]
        # Try to determine the server automatically
        server = weechat.buffer_get_string(buffer, 'localvar_server')
    # All remaining commands need a server name
    if not server:
        ircrypt_error('Unknown Server. Please use -server to specify server', buffer)
        return weechat.WEECHAT_RC_ERROR
    if argv[:1] == ['plain']:
        return ircrypt_command_plain(buffer, server, args, argv)
        target = '%s/%s' % (server, argv[1])
    except:
        ircrypt_error('Unknown command. Try  /help ircrypt', buffer)
        return weechat.WEECHAT_RC_OK
    # Set keys
    if argv[:1] == ['set-key']:
        if len(argv) < 3:
            return weechat.WEECHAT_RC_ERROR
        return ircrypt_command_set_keys(target, ' '.join(argv[2:]))
    # Remove keys
    if argv[:1] == ['remove-key']:
        if len(argv) != 2:
            return weechat.WEECHAT_RC_ERROR
        return ircrypt_command_remove_keys(target)
    # Set special cipher for channel
    if argv[:1] == ['set-cipher']:
        if len(argv) < 3:
            return weechat.WEECHAT_RC_ERROR
        return ircrypt_command_set_cip(target, ' '.join(argv[2:]))
    # Remove secial cipher for channel
    if argv[:1] == ['remove-cipher']:
        if len(argv) != 2:
            return weechat.WEECHAT_RC_ERROR
        return ircrypt_command_remove_cip(target)
    ircrypt_error('Unknown command. Try  /help ircrypt', buffer)
    return weechat.WEECHAT_RC_OK
def ircrypt_encryption_statusbar(*args):
    '''This method will set the “ircrypt” element of the status bar if
    encryption is enabled for the current channel. The placeholder {{cipher}}
    can be used, which will be replaced with the cipher used for the current
    channel.
    channel = weechat.buffer_get_string(weechat.current_buffer(), 'localvar_channel')
    server  = weechat.buffer_get_string(weechat.current_buffer(), 'localvar_server')
    key = ircrypt_keys.get(('%s/%s' % (server, channel)).lower())
    # Return nothing if no key is set for current channel
    if not key:
        return ''
    # Get cipher used for current channel
    cipher = weechat.config_string(ircrypt_config_option['sym_cipher'])
    cipher = ircrypt_cipher.get(('%s/%s' % (server, channel)).lower(), cipher)
    # Return marker, but replace {{cipher}}
    marker = weechat.config_string(ircrypt_config_option['encrypted'])
    return marker.replace('{{cipher}}', cipher)
def ircrypt_find_gpg_binary(names=('gpg2','gpg')):
    '''Check for GnuPG binary to use
    :returns: Tuple with binary name and version.
    for binary in names:
        p = subprocess.Popen([binary, '--version'],
                stdout=subprocess.PIPE,
                stderr=subprocess.PIPE)
        version = p.communicate()[0].decode('utf-8').split('\n',1)[0]
        if not p.returncode:
            return binary, version
    return None, None
def ircrypt_check_binary():
    '''If binary is not set, try to determine it automatically
    cfg_option = weechat.config_get('ircrypt.general.binary')
    gnupg = weechat.config_string(cfg_option)
    if not gnupg:
        (gnupg, version) = ircrypt_find_gpg_binary(('gpg','gpg2'))
        if not gnupg:
            ircrypt_error('Automatic detection of the GnuPG binary failed and '
                    'nothing is set manually. You wont be able to use IRCrypt like '
                    'this. Please install GnuPG or set the path to the binary to '
                    'use.', '')
        else:
            ircrypt_info('Found %s' % version, '')
            weechat.config_option_set(cfg_option, gnupg, 1)
# register plugin
if __name__ == '__main__' and weechat.register(SCRIPT_NAME, SCRIPT_AUTHOR,
        SCRIPT_VERSION, SCRIPT_LICENSE, SCRIPT_DESC, 'ircrypt_unload_script',
        'UTF-8'):
    # register the modifiers
    ircrypt_config_init()
    ircrypt_config_read()
    ircrypt_check_binary()
    weechat.hook_modifier('irc_in_privmsg',  'ircrypt_decrypt_hook', '')
    weechat.hook_modifier('irc_out_privmsg', 'ircrypt_encrypt_hook', '')
    weechat.hook_command('ircrypt', 'Commands to manage IRCrypt options and execute IRCrypt commands',
            '[list]'
            '| set-key [-server <server>] <target> <key> '
            '| remove-key [-server <server>] <target> '
            '| set-cipher [-server <server>] <target> <cipher> '
            '| remove-cipher [-server <server>] <target> '
            '| plain [-server <server>] [-channel <channel>] <message>',
            SCRIPT_HELP_TEXT,
            'list || set-key %(irc_channel)|%(nicks)|-server %(irc_servers) %- '
            '|| remove-key %(irc_channel)|%(nicks)|-server %(irc_servers) %- '
            '|| set-cipher %(irc_channel)|-server %(irc_servers) %- '
            '|| remove-cipher |%(irc_channel)|-server %(irc_servers) %- '
            '|| plain |-channel %(irc_channel)|-server %(irc_servers) %-',
            'ircrypt_command', '')
    weechat.bar_item_new('ircrypt', 'ircrypt_encryption_statusbar', '')
    weechat.hook_signal('ircrypt_buffer_opened', 'update_encryption_status', '')
def ircrypt_unload_script():
    '''Hook to ensure the configuration is properly written to disk when the
    script is unloaded.
    ircrypt_config_write()
    return weechat.WEECHAT_RC_OK
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