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