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129 lines
4.1 KiB
129 lines
4.1 KiB
3 years ago
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# Xlib.xauth -- ~/.Xauthority access
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#
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# Copyright (C) 2000 Peter Liljenberg <petli@ctrl-c.liu.se>
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# Copyright (C) 2013 LiuLang <gsushzhsosgsu@gmail.com>
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#
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 2 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program; if not, write to the Free Software
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# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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import os
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import struct
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from Xlib import X, error
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FamilyInternet = X.FamilyInternet
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FamilyDECnet = X.FamilyDECnet
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FamilyChaos = X.FamilyChaos
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FamilyLocal = 256
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class Xauthority:
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def __init__(self, filename = None):
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if filename is None:
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filename = os.environ.get('XAUTHORITY')
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if filename is None:
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try:
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filename = os.path.join(os.environ['HOME'], '.Xauthority')
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except KeyError:
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raise error.XauthError(
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'$HOME not set, cannot find ~/.Xauthority')
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try:
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raw = open(filename, 'rb').read()
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except OSError as err:
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raise error.XauthError('~/.Xauthority: %s' % err)
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self.entries = []
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# entry format (all shorts in big-endian)
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# short family;
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# short addrlen;
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# char addr[addrlen];
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# short numlen;
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# char num[numlen];
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# short namelen;
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# char name[namelen];
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# short datalen;
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# char data[datalen];
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n = 0
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try:
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while n < len(raw):
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family, = struct.unpack('>H', raw[n:n+2])
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n = n + 2
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length, = struct.unpack('>H', raw[n:n+2])
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n = n + length + 2
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addr = raw[n - length : n]
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length, = struct.unpack('>H', raw[n:n+2])
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n = n + length + 2
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num = raw[n - length : n]
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length, = struct.unpack('>H', raw[n:n+2])
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n = n + length + 2
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name = raw[n - length : n]
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length, = struct.unpack('>H', raw[n:n+2])
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n = n + length + 2
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data = raw[n - length : n]
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if len(data) != length:
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break
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self.entries.append((family, addr, num, name, data, ))
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except struct.error as e:
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print("Xlib.xauth: warning, failed to parse part of xauthority file (%s), aborting all further parsing" % filename)
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if len(self.entries) == 0:
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print("Xlib.xauth: warning, no xauthority details available")
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# raise an error? this should get partially caught by the XNoAuthError in get_best_auth..
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def __len__(self):
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return len(self.entries)
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def __getitem__(self, i):
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return self.entries[i]
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def get_best_auth(self, family, address, dispno,
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types = ( b"MIT-MAGIC-COOKIE-1", )):
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"""Find an authentication entry matching FAMILY, ADDRESS and
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DISPNO.
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The name of the auth scheme must match one of the names in
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TYPES. If several entries match, the first scheme in TYPES
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will be choosen.
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If an entry is found, the tuple (name, data) is returned,
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otherwise XNoAuthError is raised.
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"""
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num = str(dispno).encode()
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address = address.encode()
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matches = {}
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for efam, eaddr, enum, ename, edata in self.entries:
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if efam == family and eaddr == address and num == enum:
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matches[ename] = edata
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for t in types:
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try:
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return (t, matches[t])
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except KeyError:
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pass
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raise error.XNoAuthError((family, address, dispno))
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