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# Authors: Karl MacMillan <kmacmillan@mentalrootkit.com>
#
# Copyright (C) 2006,2007,2008 Red Hat, Inc.
#
# 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 2 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., 675 Mass Ave, Cambridge, MA 02139, USA.
#
"""Access control for setroubleshoot. For now this is only used for
determining which users are allowed to connect to the server: see
UserServerAccess for more information."""
import struct
import socket as Socket
import syslog
from setroubleshoot.config import get_config
from setroubleshoot.util import syslog_trace
__all__ = [
'ServerAccess',
]
# SO_PEERCRED is not defined by the socket class unless patched
# SO_PEERCRED's value is architecture dependent
# alpha, mips: 18
# parisc: 0x4011
# powerpc: 21
# sparc, sparc64: 0x0040
# default: 17
try:
SO_PEERCRED = Socket.SO_PEERCRED
except AttributeError:
import os
import re
machine = os.uname()[4]
if re.search(r'^i\d86', machine):
SO_PEERCRED = 17 # i386,i486,i586,i686, etc.
elif re.search(r'^x86_64', machine):
SO_PEERCRED = 17 # x86_64
elif re.search(r'^(ppc|powerpc)', machine):
SO_PEERCRED = 21 # ppc
elif re.search(r'^(alpha|mips)', machine):
SO_PEERCRED = 18 # alpha, mips
elif re.search(r'^sparc', machine):
SO_PEERCRED = 0x0040 # sparc
elif re.search(r'^parisc', machine):
SO_PEERCRED = 0x4011 # parisc
else:
SO_PEERCRED = 17
#print "hardcoding SO_PEERCRED=%s" % SO_PEERCRED
class ServerAccess:
"""
Determine if a user should be given access to the server based
on the configuration file.
"""
privileges = {'client': {'wildcard': True},
'fix_cmd': {'wildcard': False},
}
def __init__(self):
# No attempt is made to validate the user name is valid. This
# makes the configuration file more relaxed. Additionally, the
# server (which we assume is the only user of this class) will
# be getting uids from the kernel, so there shouldn't be access
# requested from invalid uids
self.privileges = {}
for privilege in list(ServerAccess.privileges.keys()):
self.privileges[privilege] = self.init_privilege(privilege)
def init_privilege(self, privilege):
cfg_names = [name.strip() for name in
get_config('access', '%s_users' % privilege).split(',')]
return cfg_names
def valid_privilege(self, privilege):
valid = privilege in ServerAccess.privileges
if valid:
return True
syslog.syslog(syslog.LOG_ERR, "unknown access privilege (%s)" % privilege)
return False
def unrestricted_privilege(self, privilege):
if not self.valid_privilege(privilege):
return False
if not ServerAccess.privileges[privilege]['wildcard']:
return False
return '*' in self.privileges[privilege]
def user_allowed(self, privilege, user):
"""
Determine if the given user name is allowed access.
Returns True if access should be given, False if not.
"""
if not self.valid_privilege(privilege):
return False
if self.unrestricted_privilege(privilege):
return True
if user in self.privileges[privilege]:
return True
else:
return False
def uid_allowed(self, privilege, uid):
"""
Determine if the given uid is allowed access. No error
is returned if the uid is invalid (False is returned).
Returns True if access should be given, False if not.
"""
if not self.valid_privilege(privilege):
return False
if self.unrestricted_privilege(privilege):
return True
try:
import pwd
pwd_entry = pwd.getpwuid(uid)
except KeyError:
# Not a valid uid - so they don't get access. This
# is not an error.
return False
return self.user_allowed(privilege, pwd_entry[0])
def get_credentials(self, sock):
"""Obtain the effective user and group IDs of the process on
the other end of a socket. SO_PEERCRED is used so the information
returned is generally trustworthy (though root processes can
impersonate any uid/gid)."""
pid = uid = gid = None
try:
# socket attributes family,type,proto,timeout available only in Python >= 2.5
family = sock.family
if family != Socket.AF_UNIX:
return uid, gid
except AttributeError:
# rely on pid,uid,gid being -1 if family is not AF_UNIX
pass
format_ucred = 'III' # pid_t, uid_t, gid_t
sizeof_ucred = struct.calcsize(format_ucred)
try:
ucred = sock.getsockopt(Socket.SOL_SOCKET, SO_PEERCRED, sizeof_ucred)
pid, uid, gid = struct.unpack(format_ucred, ucred)
if pid == -1:
pid = None
if uid == -1:
uid = None
if gid == -1:
gid = None
except Exception as e:
pid = uid = gid = None
import traceback
syslog_trace(traceback.format_exc())
syslog.syslog(syslog.LOG_ERR, "get_credentials(): %s" % e)
return uid, gid