530 lines
14 KiB
Python
530 lines
14 KiB
Python
#!/usr/bin/python -E
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#
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# Author(s): Caleb Case <ccase@tresys.com>
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#
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# Adapted from the bash/awk scripts mkflask.sh and mkaccess_vector.sh
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#
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import getopt
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import os
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import sys
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import re
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class ParseError(Exception):
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def __init__(self, type, file, line):
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self.type = type
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self.file = file
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self.line = line
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def __str__(self):
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typeS = self.type
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if type(self.type) is not str: typeS = Flask.CONSTANT_S[self.type]
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return "Parse Error: Unexpected %s on line %d of %s." % (typeS, self.line, self.file)
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class DuplicateError(Exception):
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def __init__(self, type, file, line, symbol):
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self.type = type
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self.file = file
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self.line = line
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self.symbol = symbol
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def __str__(self):
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typeS = self.type
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if type(self.type) is not str: typeS = Flask.CONSTANT_S[self.type]
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return "Duplicate Error: Duplicate %s '%s' on line %d of %s." % (typeS, self.symbol, self.line, self.file)
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class UndefinedError(Exception):
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def __init__(self, type, file, line, symbol):
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self.type = type
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self.file = file
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self.line = line
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self.symbol = symbol
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def __str__(self):
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typeS = self.type
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if type(self.type) is not str: typeS = Flask.CONSTANT_S[self.type]
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return "Undefined Error: %s '%s' is not defined but used on line %d of %s." % (typeS, self.symbol, self.line, self.file)
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class UnusedError(Exception):
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def __init__(self, info):
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self.info = info
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def __str__(self):
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return "Unused Error: %s" % self.info
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class Flask:
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'''
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FLASK container class with utilities for parsing definition
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files and creating c header files.
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'''
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#Constants used in definitions parsing.
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WHITE = re.compile(r'^\s*$')
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COMMENT = re.compile(r'^\s*#')
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USERFLAG = re.compile(r'# userspace')
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CLASS = re.compile(r'^class (?P<name>\w+)')
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COMMON = re.compile(r'^common (?P<name>\w+)')
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INHERITS = re.compile(r'^inherits (?P<name>\w+)')
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OPENB = re.compile(r'^{')
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VECTOR = re.compile(r'^\s*(?P<name>\w+)')
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CLOSEB = re.compile(r'^}')
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SID = re.compile(r'^sid (?P<name>\w+)')
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EOF = "end of file"
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#Constants used in header generation.
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USERSPACE = 0
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KERNEL = 1
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CONSTANT_S = { \
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#parsing constants
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WHITE : "whitespace", \
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COMMENT : "comment", \
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USERFLAG : "userspace flag", \
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CLASS : "class definition", \
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COMMON : "common definition", \
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INHERITS : "inherits definition", \
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OPENB : "'{'", \
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VECTOR : "access vector definition", \
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CLOSEB : "'}'", \
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SID : "security identifier", \
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EOF : "end of file", \
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#generation constants
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USERSPACE : "userspace mode", \
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KERNEL : "kernel mode", \
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}
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def __init__(self, warn = True):
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self.WARN = warn
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self.autogen = "/* This file is automatically generated. Do not edit. */\n"
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self.commons = []
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self.common = {}
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self.classes = []
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self.vectors = []
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self.vector = {}
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self.userspace = {}
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self.sids = []
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self.inherits = {}
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def warning(self, msg):
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'''
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Prints a warning message out to stderr if warnings are enabled.
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'''
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if self.WARN: sys.stderr.write("Warning: %s\n" % msg)
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def parseClasses(self, path):
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'''
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Parses security class definitions from the given path.
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'''
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classes = []
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input = open(path, 'r')
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number = 0
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for line in input:
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number += 1
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m = self.COMMENT.search(line)
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if m: continue
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m = self.WHITE.search(line)
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if m: continue
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m = self.CLASS.search(line)
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if m:
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g = m.groupdict()
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c = g['name']
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if c in classes: raise DuplicateError, (self.CLASS, path, number, c)
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classes.append(c)
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if self.USERFLAG.search(line):
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self.userspace[c] = True
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continue
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raise ParseError, ("data. Was expecting either a comment, whitespace, or class definition. ", path, number)
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self.classes = classes
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return classes
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def parseSids(self, path):
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'''
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Parses initial SID definitions from the given path.
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'''
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sids = []
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input = open(path, 'r')
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for line in input:
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m = self.COMMENT.search(line)
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if m: continue
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m = self.WHITE.search(line)
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if m: continue
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m = self.SID.search(line)
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if m:
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g = m.groupdict()
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s = g['name']
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if s in sids: raise DuplicateError, (self.SID, path, number, s)
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sids.append(s)
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continue
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raise ParseError, ("data. Was expecting either a comment, whitespace, or security identifier. ", path, number)
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self.sids = sids
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return sids
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def parseVectors(self, path):
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'''
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Parses access vector definitions from the given path.
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'''
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vectors = []
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vector = {}
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commons = []
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common = {}
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inherits = {}
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input = open(path, 'r')
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# states
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NONE = 0
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COMMON = 1
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CLASS = 2
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INHERIT = 3
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OPEN = 4
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state = NONE
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state2 = NONE
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number = 0
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for line in input:
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number += 1
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m = self.COMMENT.search(line)
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if m: continue
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m = self.WHITE.search(line)
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if m:
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if state == INHERIT:
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state = NONE
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continue
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m = self.COMMON.search(line)
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if m:
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if state != NONE: raise ParseError, (self.COMMON, path, number)
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g = m.groupdict()
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c = g['name']
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if c in commons: raise DuplicateError, (self.COMMON, path, number, c)
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commons.append(c)
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common[c] = []
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state = COMMON
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continue
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m = self.CLASS.search(line)
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if m:
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if state != NONE: raise ParseError, (self.CLASS, number)
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g = m.groupdict()
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c = g['name']
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if c in vectors: raise DuplicateError, (self.CLASS, path, number, c)
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if c not in self.classes: raise UndefinedError, (self.CLASS, path, number, c)
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vectors.append(c)
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vector[c] = []
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state = CLASS
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continue
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m = self.INHERITS.search(line)
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if m:
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if state != CLASS: raise ParseError, (self.INHERITS, number)
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g = m.groupdict()
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i = g['name']
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if c in inherits: raise DuplicateError, (self.INHERITS, path, number, c)
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if i not in common: raise UndefinedError, (self.COMMON, path, number, i)
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inherits[c] = i
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state = INHERIT
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continue
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m = self.OPENB.search(line)
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if m:
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if (state != CLASS \
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and state != INHERIT \
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and state != COMMON) \
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or state2 != NONE:
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raise ParseError, (self.OPENB, path, number)
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state2 = OPEN
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continue
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m = self.VECTOR.search(line)
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if m:
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if state2 != OPEN: raise ParseError, (self.VECTOR, path, number)
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g = m.groupdict()
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v = g['name']
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if state == CLASS or state == INHERIT:
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if v in vector[c]: raise DuplicateError, (self.VECTOR, path, number, v)
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vector[c].append(v)
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elif state == COMMON:
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if v in common[c]: raise DuplicateError, (self.VECTOR, path, number, v)
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common[c].append(v)
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continue
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m = self.CLOSEB.search(line)
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if m:
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if state2 != OPEN: raise ParseError, (self.CLOSEB, path, number)
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state = NONE
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state2 = NONE
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c = None
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continue
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raise ParseError, ("data", path, number)
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if state != NONE and state2 != NONE: raise ParseError, (self.EOF, path, number)
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cvdiff = set(self.classes) - set(vectors)
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if cvdiff: raise UnusedError, "Not all security classes were used in access vectors: %s" % cvdiff # the inverse of this will be caught as an undefined class error
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self.commons = commons
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self.common = common
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self.vectors = vectors
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self.vector = vector
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self.inherits = inherits
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return vector
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def createHeaders(self, path, mode = USERSPACE):
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'''
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Creates the C header files in the specified MODE and outputs
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them to give PATH.
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'''
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headers = { \
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'av_inherit.h' : self.createAvInheritH(mode), \
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'av_perm_to_string.h' : self.createAvPermToStringH(mode), \
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'av_permissions.h' : self.createAvPermissionsH(mode), \
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'class_to_string.h' : self.createClassToStringH(mode), \
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'common_perm_to_string.h' : self.createCommonPermToStringH(mode), \
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'flask.h' : self.createFlaskH(mode), \
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'initial_sid_to_string.h' : self.createInitialSidToStringH(mode) \
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}
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for key, value in headers.items():
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of = open(os.path.join(path, key), 'w')
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of.writelines(value)
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of.close()
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def createUL(self, count):
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fields = [1, 2, 4, 8]
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return "0x%08xUL" % (fields[count % 4] << 4 * (count / 4))
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def createAvInheritH(self, mode = USERSPACE):
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'''
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'''
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results = []
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results.append(self.autogen)
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for c in self.vectors:
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if self.inherits.has_key(c):
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i = self.inherits[c]
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count = len(self.common[i])
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user = self.userspace.has_key(c)
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if mode == self.KERNEL and user:
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results.append(" S_(0, 0, 0)\n")
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else:
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results.append(" S_(SECCLASS_%s, %s, %s)\n" % (c.upper(), i, self.createUL(count)))
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return results
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def createAvPermToStringH(self, mode = USERSPACE):
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'''
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'''
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results = []
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results.append(self.autogen)
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for c in self.vectors:
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for p in self.vector[c]:
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user = self.userspace.has_key(c)
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if (mode == self.KERNEL and not user) or (mode == self.USERSPACE):
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results.append(" S_(SECCLASS_%s, %s__%s, \"%s\")\n" % (c.upper(), c.upper(), p.upper(), p))
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return results
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def createAvPermissionsH(self, mode = USERSPACE):
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'''
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'''
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results = []
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results.append(self.autogen)
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width = 57
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count = 0
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for common in self.commons:
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count = 0
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shift = 0
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for p in self.common[common]:
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columnA = "#define COMMON_%s__%s " % (common.upper(), p.upper())
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columnA += "".join([" " for i in range(width - len(columnA))])
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results.append("%s%s\n" % (columnA, self.createUL(count)))
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count += 1
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width = 50 # broken for old tools whitespace
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for c in self.vectors:
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count = 0
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ps = []
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if self.inherits.has_key(c):
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ps += self.common[self.inherits[c]]
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ps += self.vector[c]
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for p in ps:
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columnA = "#define %s__%s " % (c.upper(), p.upper())
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columnA += "".join([" " for i in range(width - len(columnA))])
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user = self.userspace.has_key(c)
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if not (mode == self.KERNEL and user):
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results.append("%s%s\n" % (columnA, self.createUL(count)))
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count += 1
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return results
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def createClassToStringH(self, mode = USERSPACE):
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'''
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'''
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results = []
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results.append(self.autogen)
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results.append("/*\n * Security object class definitions\n */\n")
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results.append(" S_(NULL)\n")
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for c in self.classes:
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user = self.userspace.has_key(c)
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if mode == self.KERNEL and user:
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results.append(" S_(NULL)\n")
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else:
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results.append(" S_(\"%s\")\n" % c)
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return results
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def createCommonPermToStringH(self, mode = USERSPACE):
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'''
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'''
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results = []
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results.append(self.autogen)
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for common in self.commons:
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results.append("TB_(common_%s_perm_to_string)\n" % common)
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for p in self.common[common]:
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results.append(" S_(\"%s\")\n" % p)
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results.append("TE_(common_%s_perm_to_string)\n\n" % common)
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return results
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def createFlaskH(self, mode = USERSPACE):
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'''
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'''
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results = []
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results.append(self.autogen)
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results.append("#ifndef _SELINUX_FLASK_H_\n")
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results.append("#define _SELINUX_FLASK_H_\n")
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results.append("\n")
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results.append("/*\n")
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results.append(" * Security object class definitions\n")
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results.append(" */\n")
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count = 0
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width = 57
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for c in self.classes:
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count += 1
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columnA = "#define SECCLASS_%s " % c.upper()
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columnA += "".join([" " for i in range(width - len(columnA))])
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user = self.userspace.has_key(c)
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if not (mode == self.KERNEL and user):
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results.append("%s%d\n" % (columnA, count))
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results.append("\n")
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results.append("/*\n")
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results.append(" * Security identifier indices for initial entities\n")
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results.append(" */\n")
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count = 0
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width = 56 # broken for old tools whitespace
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for s in self.sids:
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count += 1
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columnA = "#define SECINITSID_%s " % s.upper()
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columnA += "".join([" " for i in range(width - len(columnA))])
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results.append("%s%d\n" % (columnA, count))
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results.append("\n")
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columnA = "#define SECINITSID_NUM "
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columnA += "".join([" " for i in range(width - len(columnA))])
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results.append("%s%d\n" % (columnA, count))
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results.append("\n")
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results.append("#endif\n")
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return results
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def createInitialSidToStringH(self, mode = USERSPACE):
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'''
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'''
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results = []
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results.append(self.autogen)
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results.append("static char *initial_sid_to_string[] =\n")
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results.append("{\n")
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results.append(" \"null\",\n")
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for s in self.sids:
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results.append(" \"%s\",\n" % s)
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results.append("};\n")
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results.append("\n")
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return results
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def usage():
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'''
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Returns the usage string.
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'''
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usage = 'Usage: %s -a ACCESS_VECTORS -i INITIAL_SIDS -s SECURITY_CLASSES -o OUTPUT_DIRECTORY -k|-u [-w]\n' % os.path.basename(sys.argv[0])
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usage += '\n'
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usage += ' -a --access_vectors\taccess vector definitions\n'
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usage += ' -i --initial_sids\tinitial sid definitions\n'
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usage += ' -s --security_classes\tsecurity class definitions\n'
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usage += ' -o --output\toutput directory for generated files\n'
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usage += ' -k --kernel\toutput mode set to kernel (kernel headers contain empty blocks for all classes specified with # userspace in the security_classes file)\n'
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usage += ' -u --user\toutput mode set to userspace\n'
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usage += ' -w --nowarnings\tsupresses output of warning messages\n'
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return usage
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########## MAIN ##########
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if __name__ == '__main__':
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# Parse command line args
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try:
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opts, args = getopt.getopt(sys.argv[1:], 'a:i:s:o:kuwh', ['access_vectors=', 'initial_sids=', 'security_classes=', 'output=', 'kernel', 'user', 'nowarnings', 'help'])
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except getopt.GetoptError:
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print(usage())
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sys.exit(2)
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avec = None
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isid = None
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secc = None
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outd = None
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mode = None
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warn = True
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for o, a in opts:
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if o in ('-h', '--help'):
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print(usage())
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sys.exit(0)
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elif o in ('-a', '--access_vectors'):
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avec = a
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elif o in ('-i', '--initial_sids'):
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isid = a
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elif o in ('-s', '--security_classes'):
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secc = a
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elif o in ('-o', '--output'):
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outd = a
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elif o in ('-k', '--kernel'):
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if mode != None:
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print(usage())
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sys.exit(2)
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mode = Flask.KERNEL
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elif o in ('-u', '--user'):
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if mode != None:
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print(usage())
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sys.exit(2)
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mode = Flask.USERSPACE
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elif o in ('-w', '--nowarnings'):
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warn = False
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else:
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print(usage())
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sys.exit(2)
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if avec == None or \
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isid == None or \
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secc == None or \
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outd == None:
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print(usage())
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sys.exit(2)
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try:
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|
f = Flask(warn)
|
|
f.parseSids(isid)
|
|
f.parseClasses(secc)
|
|
f.parseVectors(avec)
|
|
f.createHeaders(outd, mode)
|
|
except Exception, e:
|
|
print(e)
|
|
sys.exit(2)
|