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__pycache__	-	Open
access.py	11.7 MB	View DL Edit
audit.py	21.46 MB	View DL Edit
classperms.py	2.75 MB	View DL Edit
defaults.py	2.83 MB	View DL Edit
interfaces.py	16.08 MB	View DL Edit
lex.py	41.9 MB	View DL Edit
matching.py	8.45 MB	View DL Edit
module.py	7.12 MB	View DL Edit
objectmodel.py	6.37 MB	View DL Edit
output.py	5.04 MB	View DL Edit
policygen.py	14.99 MB	View DL Edit
refparser.py	30.6 MB	View DL Edit
refpolicy.py	31.42 MB	View DL Edit
sepolgeni18n.py	1013 B	View DL Edit
util.py	5.35 MB	View DL Edit
yacc.py	134.1 MB	View DL Edit
__init__.py	0 B	View DL Edit

Edit file: /lib/python3.9/site-packages/sepolgen/refparser.py

# Authors: Karl MacMillan <kmacmillan@mentalrootkit.com>
#
# Copyright (C) 2006-2007 Red Hat
# see file 'COPYING' for use and warranty information
#
# 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; version 2 only
#
# 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
#

# OVERVIEW
#
#
# This is a parser for the refpolicy policy "language" - i.e., the
# normal SELinux policy language plus the refpolicy style M4 macro
# constructs on top of that base language. This parser is primarily
# aimed at parsing the policy headers in order to create an abstract
# policy representation suitable for generating policy.
#
# Both the lexer and parser are included in this file. The are implemented
# using the Ply library (included with sepolgen).

import sys
import os
import re
import traceback

from . import access
from . import defaults
from . import lex
from . import refpolicy
from . import yacc

# :::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::
#
# lexer
#
# :::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::

tokens = (
    # basic tokens, punctuation
    'TICK',
    'SQUOTE',
    'OBRACE',
    'CBRACE',
    'SEMI',
    'COLON',
    'OPAREN',
    'CPAREN',
    'COMMA',
    'MINUS',
    'TILDE',
    'ASTERISK',
    'AMP',
    'BAR',
    'EXPL',
    'EQUAL',
    'FILENAME',
    'IDENTIFIER',
    'NUMBER',
    'PATH',
    'IPV6_ADDR',
    # reserved words
    #   module
    'MODULE',
    'POLICY_MODULE',
    'REQUIRE',
    #   flask
    'SID',
    'GENFSCON',
    'FS_USE_XATTR',
    'FS_USE_TRANS',
    'FS_USE_TASK',
    'PORTCON',
    'NODECON',
    'NETIFCON',
    'PIRQCON',
    'IOMEMCON',
    'IOPORTCON',
    'PCIDEVICECON',
    'DEVICETREECON',
    #   object classes
    'CLASS',
    #   types and attributes
    'TYPEATTRIBUTE',
    'ROLEATTRIBUTE',
    'TYPE',
    'ATTRIBUTE',
    'ATTRIBUTE_ROLE',
    'ALIAS',
    'TYPEALIAS',
    #   conditional policy
    'BOOL',
    'TRUE',
    'FALSE',
    'IF',
    'ELSE',
    #   users and roles
    'ROLE',
    'TYPES',
    #   rules
    'ALLOW',
    'DONTAUDIT',
    'AUDITALLOW',
    'NEVERALLOW',
    'PERMISSIVE',
    'TYPEBOUNDS',
    'TYPE_TRANSITION',
    'TYPE_CHANGE',
    'TYPE_MEMBER',
    'RANGE_TRANSITION',
    'ROLE_TRANSITION',
    #   refpolicy keywords
    'OPT_POLICY',
    'INTERFACE',
    'TUNABLE_POLICY',
    'GEN_REQ',
    'TEMPLATE',
    'GEN_CONTEXT',
    'GEN_TUNABLE',
    #   m4
    'IFELSE',
    'IFDEF',
    'IFNDEF',
    'DEFINE'
    )

# All reserved keywords - see t_IDENTIFIER for how these are matched in
# the lexer.
reserved = {
    # module
    'module' : 'MODULE',
    'policy_module' : 'POLICY_MODULE',
    'require' : 'REQUIRE',
    # flask
    'sid' : 'SID',
    'genfscon' : 'GENFSCON',
    'fs_use_xattr' : 'FS_USE_XATTR',
    'fs_use_trans' : 'FS_USE_TRANS',
    'fs_use_task' : 'FS_USE_TASK',
    'portcon' : 'PORTCON',
    'nodecon' : 'NODECON',
    'netifcon' : 'NETIFCON',
    'pirqcon' : 'PIRQCON',
    'iomemcon' : 'IOMEMCON',
    'ioportcon' : 'IOPORTCON',
    'pcidevicecon' : 'PCIDEVICECON',
    'devicetreecon' : 'DEVICETREECON',
    # object classes
    'class' : 'CLASS',
    # types and attributes
    'typeattribute' : 'TYPEATTRIBUTE',
    'roleattribute' : 'ROLEATTRIBUTE',
    'type' : 'TYPE',
    'attribute' : 'ATTRIBUTE',
    'attribute_role' : 'ATTRIBUTE_ROLE',
    'alias' : 'ALIAS',
    'typealias' : 'TYPEALIAS',
    # conditional policy
    'bool' : 'BOOL',
    'true' : 'TRUE',
    'false' : 'FALSE',
    'if' : 'IF',
    'else' : 'ELSE',
    # users and roles
    'role' : 'ROLE',
    'types' : 'TYPES',
    # rules
    'allow' : 'ALLOW',
    'dontaudit' : 'DONTAUDIT',
    'auditallow' : 'AUDITALLOW',
    'neverallow' : 'NEVERALLOW',
    'permissive' : 'PERMISSIVE',
    'typebounds' : 'TYPEBOUNDS',
    'type_transition' : 'TYPE_TRANSITION',
    'type_change' : 'TYPE_CHANGE',
    'type_member' : 'TYPE_MEMBER',
    'range_transition' : 'RANGE_TRANSITION',
    'role_transition' : 'ROLE_TRANSITION',
    # refpolicy keywords
    'optional_policy' : 'OPT_POLICY',
    'interface' : 'INTERFACE',
    'tunable_policy' : 'TUNABLE_POLICY',
    'gen_require' : 'GEN_REQ',
    'template' : 'TEMPLATE',
    'gen_context' : 'GEN_CONTEXT',
    'gen_tunable' : 'GEN_TUNABLE',
    # M4
    'ifelse' : 'IFELSE',
    'ifndef' : 'IFNDEF',
    'ifdef' : 'IFDEF',
    'define' : 'DEFINE'
    }

# The ply lexer allows definition of tokens in 2 ways: regular expressions
# or functions.

# Simple regex tokens
t_TICK      = r'\`'
t_SQUOTE    = r'\''
t_OBRACE    = r'\{'
t_CBRACE    = r'\}'
# This will handle spurious extra ';' via the +
t_SEMI      = r'\;+'
t_COLON     = r'\:'
t_OPAREN    = r'$'
t_CPAREN    = r'$'
t_COMMA     = r'\,'
t_MINUS     = r'\-'
t_TILDE     = r'\~'
t_ASTERISK  = r'\*'
t_AMP       = r'\&'
t_BAR       = r'\|'
t_EXPL      = r'\!'
t_EQUAL     = r'\='
t_NUMBER    = r'[0-9\.]+'
t_PATH      = r'/[a-zA-Z0-9)_\.\*/\$]*'
#t_IPV6_ADDR = r'[a-fA-F0-9]{0,4}:[a-fA-F0-9]{0,4}:([a-fA-F0-9]{0,4}:)*'

# Ignore whitespace - this is a special token for ply that more efficiently
# ignores uninteresting tokens.
t_ignore    = " \t"

# More complex tokens
def t_IPV6_ADDR(t):
    r'[a-fA-F0-9]{0,4}:[a-fA-F0-9]{0,4}:([a-fA-F0-9]|:)*'
    # This is a function simply to force it sooner into
    # the regex list
    return t

def t_m4comment(t):
    r'dnl.*\n'
    # Ignore all comments
    t.lexer.lineno += 1

def t_refpolicywarn1(t):
    r'define.*refpolicywarn\(.*\n'
    # Ignore refpolicywarn statements - they sometimes
    # contain text that we can't parse.
    t.skip(1)

def t_refpolicywarn(t):
    r'refpolicywarn\(.*\n'
    # Ignore refpolicywarn statements - they sometimes
    # contain text that we can't parse.
    t.lexer.lineno += 1

def t_IDENTIFIER(t):
    r'[a-zA-Z_\$][a-zA-Z0-9_\-\+\.\$\*~]*'
    # Handle any keywords
    t.type = reserved.get(t.value,'IDENTIFIER')
    return t

def t_FILENAME(t):
    r'\"[a-zA-Z0-9_\-\+\.\$\*~ :\[\]]+\"'
    # Handle any keywords
    t.type = reserved.get(t.value,'FILENAME')
    return t

def t_comment(t):
    r'\#.*\n'
    # Ignore all comments
    t.lexer.lineno += 1

def t_error(t):
    print("Illegal character '%s'" % t.value[0])
    t.skip(1)

def t_newline(t):
    r'\n+'
    t.lexer.lineno += len(t.value)

# :::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::
#
# Parser
#
# :::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::

# Global data used during parsing - making it global is easier than
# passing the state through the parsing functions.

#   m is the top-level data structure (stands for modules).
m = None
#   error is either None (indicating no error) or a string error message.
error = None
parse_file = ""
#   spt is the support macros (e.g., obj/perm sets) - it is an instance of
#     refpolicy.SupportMacros and should always be present during parsing
#     though it may not contain any macros.
spt = None
success = True

# utilities
def collect(stmts, parent, val=None):
    if stmts is None:
        return
    for s in stmts:
        if s is None:
            continue
        s.parent = parent
        if val is not None:
            parent.children.insert(0, (val, s))
        else:
            parent.children.insert(0, s)

def expand(ids, s):
    for id in ids:
        if spt.has_key(id):  # noqa
            s.update(spt.by_name(id))
        else:
            s.add(id)

# Top-level non-terminal
def p_statements(p):
    '''statements : statement
                  | statements statement
                  | empty
    '''
    if len(p) == 2 and p[1]:
        m.children.append(p[1])
    elif len(p) > 2 and p[2]:
        m.children.append(p[2])

def p_empty(p):
    'empty :'
    pass

#
# Reference policy language constructs
#

# This is for the policy module statement (e.g., policy_module(foo,1.2.0)).
# We have a separate terminal for either the basic language module statement
# and interface calls to make it easier to identifier.
def p_policy_module_stmt(p):
    'policy_module_stmt : POLICY_MODULE OPAREN IDENTIFIER COMMA NUMBER CPAREN'
    m = refpolicy.ModuleDeclaration()
    m.name = p[3]
    m.version = p[5]
    m.refpolicy = True
    p[0] = m

def p_interface(p):
    '''interface : INTERFACE OPAREN TICK IDENTIFIER SQUOTE COMMA TICK interface_stmts SQUOTE CPAREN
    '''
    x = refpolicy.Interface(p[4])
    collect(p[8], x)
    p[0] = x

def p_template(p):
    '''template : TEMPLATE OPAREN TICK IDENTIFIER SQUOTE COMMA TICK interface_stmts SQUOTE CPAREN
                | DEFINE OPAREN TICK IDENTIFIER SQUOTE COMMA TICK interface_stmts SQUOTE CPAREN
    '''
    x = refpolicy.Template(p[4])
    collect(p[8], x)
    p[0] = x

def p_define(p):
    '''define : DEFINE OPAREN TICK IDENTIFIER SQUOTE CPAREN'''
    # This is for defining single M4 values (to be used later in ifdef statements).
    # Example: define(`sulogin_no_pam'). We don't currently do anything with these
    # but we should in the future when we correctly resolve ifdef statements.
    p[0] = None

def p_interface_stmts(p):
    '''interface_stmts : policy
                       | interface_stmts policy
                       | empty
    '''
    if len(p) == 2 and p[1]:
        p[0] = p[1]
    elif len(p) > 2:
        if not p[1]:
            if p[2]:
                p[0] = p[2]
        elif not p[2]:
            p[0] = p[1]
        else:
            p[0] = p[1] + p[2]

def p_optional_policy(p):
    '''optional_policy : OPT_POLICY OPAREN TICK interface_stmts SQUOTE CPAREN
                       | OPT_POLICY OPAREN TICK interface_stmts SQUOTE COMMA TICK interface_stmts SQUOTE CPAREN
    '''
    o = refpolicy.OptionalPolicy()
    collect(p[4], o, val=True)
    if len(p) > 7:
        collect(p[8], o, val=False)
    p[0] = [o]

def p_tunable_policy(p):
    '''tunable_policy : TUNABLE_POLICY OPAREN TICK cond_expr SQUOTE COMMA TICK interface_stmts SQUOTE CPAREN
                      | TUNABLE_POLICY OPAREN TICK cond_expr SQUOTE COMMA TICK interface_stmts SQUOTE COMMA TICK interface_stmts SQUOTE CPAREN
    '''
    x = refpolicy.TunablePolicy()
    x.cond_expr = p[4]
    collect(p[8], x, val=True)
    if len(p) > 11:
        collect(p[12], x, val=False)
    p[0] = [x]

def p_ifelse(p):
    '''ifelse : IFELSE OPAREN TICK IDENTIFIER SQUOTE COMMA COMMA TICK IDENTIFIER SQUOTE COMMA TICK interface_stmts SQUOTE CPAREN optional_semi
              | IFELSE OPAREN TICK IDENTIFIER SQUOTE COMMA TICK IDENTIFIER SQUOTE COMMA TICK interface_stmts SQUOTE COMMA TICK interface_stmts SQUOTE CPAREN optional_semi
              | IFELSE OPAREN TICK IDENTIFIER SQUOTE COMMA TICK SQUOTE COMMA TICK interface_stmts SQUOTE COMMA TICK interface_stmts SQUOTE CPAREN optional_semi
    '''
#    x = refpolicy.IfDef(p[4])
#    v = True
#    collect(p[8], x, val=v)
#    if len(p) > 12:
#        collect(p[12], x, val=False)
#    p[0] = [x]
    pass

def p_ifdef(p):
    '''ifdef : IFDEF OPAREN TICK IDENTIFIER SQUOTE COMMA TICK statements SQUOTE CPAREN optional_semi
             | IFNDEF OPAREN TICK IDENTIFIER SQUOTE COMMA TICK statements SQUOTE CPAREN optional_semi
             | IFDEF OPAREN TICK IDENTIFIER SQUOTE COMMA TICK statements SQUOTE COMMA TICK statements SQUOTE CPAREN optional_semi
    '''
    x = refpolicy.IfDef(p[4])
    if p[1] == 'ifdef':
        v = True
    else:
        v = False
    collect(p[8], x, val=v)
    if len(p) > 12:
        collect(p[12], x, val=False)
    p[0] = [x]

def p_interface_call(p):
    '''interface_call : IDENTIFIER OPAREN interface_call_param_list CPAREN
                      | IDENTIFIER OPAREN CPAREN
                      | IDENTIFIER OPAREN interface_call_param_list CPAREN SEMI'''
    # Allow spurious semi-colons at the end of interface calls
    i = refpolicy.InterfaceCall(ifname=p[1])
    if len(p) > 4:
        i.args.extend(p[3])
    p[0] = i

def p_interface_call_param(p):
    '''interface_call_param : IDENTIFIER
                            | IDENTIFIER MINUS IDENTIFIER
                            | nested_id_set
                            | TRUE
                            | FALSE
                            | FILENAME
    '''
    # Intentionally let single identifiers pass through
    # List means set, non-list identifier
    if len(p) == 2:
        p[0] = p[1]
    else:
        p[0] = [p[1], "-" + p[3]]

def p_interface_call_param_list(p):
    '''interface_call_param_list : interface_call_param
                                 | interface_call_param_list COMMA interface_call_param
    '''
    if len(p) == 2:
        p[0] = [p[1]]
    else:
        p[0] = p[1] + [p[3]]

def p_obj_perm_set(p):
    'obj_perm_set : DEFINE OPAREN TICK IDENTIFIER SQUOTE COMMA TICK names SQUOTE CPAREN'
    s = refpolicy.ObjPermSet(p[4])
    s.perms = p[8]
    p[0] = s
    
#
# Basic SELinux policy language
#

def p_module_stmt(p):
    'module_stmt : MODULE IDENTIFIER NUMBER SEMI'
    m = refpolicy.ModuleDeclaration()
    m.name = p[2]
    m.version = p[3]
    m.refpolicy = False
    p[0] = m

def p_gen_require(p):
    '''gen_require : GEN_REQ OPAREN TICK requires SQUOTE CPAREN
                   | REQUIRE OBRACE requires CBRACE'''
    # We ignore the require statements - they are redundant data from our point-of-view.
    # Checkmodule will verify them later anyway so we just assume that they match what
    # is in the rest of the interface.
    pass

def p_requires(p):
    '''requires : require
                | requires require
                | ifdef
                | requires ifdef
    '''
    pass

def p_security_context(p):
    '''security_context : IDENTIFIER COLON IDENTIFIER COLON IDENTIFIER
                        | IDENTIFIER COLON IDENTIFIER COLON IDENTIFIER COLON mls_range_def'''
    # This will likely need some updates to handle complex levels
    s = refpolicy.SecurityContext()
    s.user = p[1]
    s.role = p[3]
    s.type = p[5]
    if len(p) > 6:
        s.level = p[7]

p[0] = s

def p_gen_context(p):
    '''gen_context : GEN_CONTEXT OPAREN security_context COMMA mls_range_def CPAREN
    '''
    # We actually store gen_context statements in a SecurityContext
    # object - it knows how to output either a bare context or a
    # gen_context statement.
    s = p[3]
    s.level = p[5]
    
    p[0] = s

def p_context(p):
    '''context : security_context
               | gen_context
    '''
    p[0] = p[1]

def p_initial_sid(p):
    '''initial_sid : SID IDENTIFIER context'''
    s = refpolicy.InitialSid()
    s.name = p[2]
    s.context = p[3]
    p[0] = s

def p_genfscon(p):
    '''genfscon : GENFSCON IDENTIFIER PATH context'''
    
    g = refpolicy.GenfsCon()
    g.filesystem = p[2]
    g.path = p[3]
    g.context = p[4]

p[0] = g

def p_fs_use(p):
    '''fs_use : FS_USE_XATTR IDENTIFIER context SEMI
              | FS_USE_TASK IDENTIFIER context SEMI
              | FS_USE_TRANS IDENTIFIER context SEMI
    '''
    f = refpolicy.FilesystemUse()
    if p[1] == "fs_use_xattr":
        f.type = refpolicy.FilesystemUse.XATTR
    elif p[1] == "fs_use_task":
        f.type = refpolicy.FilesystemUse.TASK
    elif p[1] == "fs_use_trans":
        f.type = refpolicy.FilesystemUse.TRANS

f.filesystem = p[2]
    f.context = p[3]

p[0] = f

def p_portcon(p):
    '''portcon : PORTCON IDENTIFIER NUMBER context
               | PORTCON IDENTIFIER NUMBER MINUS NUMBER context'''
    c = refpolicy.PortCon()
    c.port_type = p[2]
    if len(p) == 5:
        c.port_number = p[3]
        c.context = p[4]
    else:
        c.port_number = p[3] + "-" + p[4]
        c.context = p[5]

p[0] = c

def p_nodecon(p):
    '''nodecon : NODECON NUMBER NUMBER context
               | NODECON IPV6_ADDR IPV6_ADDR context
    '''
    n = refpolicy.NodeCon()
    n.start = p[2]
    n.end = p[3]
    n.context = p[4]

p[0] = n

def p_netifcon(p):
    'netifcon : NETIFCON IDENTIFIER context context'
    n = refpolicy.NetifCon()
    n.interface = p[2]
    n.interface_context = p[3]
    n.packet_context = p[4]

p[0] = n

def p_pirqcon(p):
    'pirqcon : PIRQCON NUMBER context'
    c = refpolicy.PirqCon()
    c.pirq_number = p[2]
    c.context = p[3]

p[0] = c

def p_iomemcon(p):
    '''iomemcon : IOMEMCON NUMBER context
                | IOMEMCON NUMBER MINUS NUMBER context'''
    c = refpolicy.IomemCon()
    if len(p) == 4:
        c.device_mem = p[2]
        c.context = p[3]
    else:
        c.device_mem = p[2] + "-" + p[3]
        c.context = p[4]

p[0] = c

def p_ioportcon(p):
    '''ioportcon : IOPORTCON NUMBER context
                | IOPORTCON NUMBER MINUS NUMBER context'''
    c = refpolicy.IoportCon()
    if len(p) == 4:
        c.ioport = p[2]
        c.context = p[3]
    else:
        c.ioport = p[2] + "-" + p[3]
        c.context = p[4]

p[0] = c

def p_pcidevicecon(p):
    'pcidevicecon : PCIDEVICECON NUMBER context'
    c = refpolicy.PciDeviceCon()
    c.device = p[2]
    c.context = p[3]

p[0] = c

def p_devicetreecon(p):
    'devicetreecon : DEVICETREECON NUMBER context'
    c = refpolicy.DevicetTeeCon()
    c.path = p[2]
    c.context = p[3]

p[0] = c

def p_mls_range_def(p):
    '''mls_range_def : mls_level_def MINUS mls_level_def
                     | mls_level_def
    '''
    p[0] = p[1]
    if len(p) > 2:
        p[0] = p[0] + "-" + p[3]

def p_mls_level_def(p):
    '''mls_level_def : IDENTIFIER COLON comma_list
                     | IDENTIFIER
    '''
    p[0] = p[1]
    if len(p) > 2:
        p[0] = p[0] + ":" + ",".join(p[3])
    
def p_type_def(p):
    '''type_def : TYPE IDENTIFIER COMMA comma_list SEMI
                | TYPE IDENTIFIER SEMI
                | TYPE IDENTIFIER ALIAS names SEMI
                | TYPE IDENTIFIER ALIAS names COMMA comma_list SEMI
    '''
    t = refpolicy.Type(p[2])
    if len(p) == 6:
        if p[3] == ',':
            t.attributes.update(p[4])
        else:
            t.aliases = p[4]
    elif len(p) > 4:
        t.aliases = p[4]
        if len(p) == 8:
            t.attributes.update(p[6])
    p[0] = t

def p_attribute_def(p):
    'attribute_def : ATTRIBUTE IDENTIFIER SEMI'
    a = refpolicy.Attribute(p[2])
    p[0] = a

def p_attribute_role_def(p):
    'attribute_role_def : ATTRIBUTE_ROLE IDENTIFIER SEMI'
    a = refpolicy.Attribute_Role(p[2])
    p[0] = a

def p_typealias_def(p):
    'typealias_def : TYPEALIAS IDENTIFIER ALIAS names SEMI'
    t = refpolicy.TypeAlias()
    t.type = p[2]
    t.aliases = p[4]
    p[0] = t

def p_role_def(p):
    '''role_def : ROLE IDENTIFIER TYPES comma_list SEMI
                | ROLE IDENTIFIER SEMI'''
    r = refpolicy.Role()
    r.role = p[2]
    if len(p) > 4:
        r.types.update(p[4])
    p[0] = r

def p_role_allow(p):
    'role_allow : ALLOW names names SEMI'
    r = refpolicy.RoleAllow()
    r.src_roles = p[2]
    r.tgt_roles = p[3]
    p[0] = r

def p_permissive(p):
    'permissive : PERMISSIVE names SEMI'
    pass

def p_avrule_def(p):
    '''avrule_def : ALLOW names names COLON names names SEMI
                  | DONTAUDIT names names COLON names names SEMI
                  | AUDITALLOW names names COLON names names SEMI
                  | NEVERALLOW names names COLON names names SEMI
    '''
    a = refpolicy.AVRule()
    if p[1] == 'dontaudit':
        a.rule_type = refpolicy.AVRule.DONTAUDIT
    elif p[1] == 'auditallow':
        a.rule_type = refpolicy.AVRule.AUDITALLOW
    elif p[1] == 'neverallow':
        a.rule_type = refpolicy.AVRule.NEVERALLOW
    a.src_types = p[2]
    a.tgt_types = p[3]
    a.obj_classes = p[5]
    a.perms = p[6]
    p[0] = a

def p_typerule_def(p):
    '''typerule_def : TYPE_TRANSITION names names COLON names IDENTIFIER SEMI
                    | TYPE_TRANSITION names names COLON names IDENTIFIER FILENAME SEMI
                    | TYPE_TRANSITION names names COLON names IDENTIFIER IDENTIFIER SEMI
                    | TYPE_CHANGE names names COLON names IDENTIFIER SEMI
                    | TYPE_MEMBER names names COLON names IDENTIFIER SEMI
    '''
    t = refpolicy.TypeRule()
    if p[1] == 'type_change':
        t.rule_type = refpolicy.TypeRule.TYPE_CHANGE
    elif p[1] == 'type_member':
        t.rule_type = refpolicy.TypeRule.TYPE_MEMBER
    t.src_types = p[2]
    t.tgt_types = p[3]
    t.obj_classes = p[5]
    t.dest_type = p[6]
    t.file_name = p[7]
    p[0] = t

def p_typebound_def(p):
    '''typebound_def : TYPEBOUNDS IDENTIFIER comma_list SEMI'''
    t = refpolicy.TypeBound()
    t.type = p[2]
    t.tgt_types.update(p[3])
    p[0] = t

def p_bool(p):
    '''bool : BOOL IDENTIFIER TRUE SEMI
            | BOOL IDENTIFIER FALSE SEMI'''
    b = refpolicy.Bool()
    b.name = p[2]
    if p[3] == "true":
        b.state = True
    else:
        b.state = False
    p[0] = b

def p_gen_tunable(p):
    '''gen_tunable : GEN_TUNABLE OPAREN TICK IDENTIFIER SQUOTE COMMA TRUE CPAREN
                   | GEN_TUNABLE OPAREN TICK IDENTIFIER SQUOTE COMMA FALSE CPAREN'''
    b = refpolicy.Bool()
    b.name = p[4]
    if p[7] == "true":
        b.state = True
    else:
        b.state = False
    p[0] = b

def p_conditional(p):
    ''' conditional : IF OPAREN cond_expr CPAREN OBRACE interface_stmts CBRACE
                    | IF OPAREN cond_expr CPAREN OBRACE interface_stmts CBRACE ELSE OBRACE interface_stmts CBRACE
    '''
    c = refpolicy.Conditional()
    c.cond_expr = p[3]
    collect(p[6], c, val=True)
    if len(p) > 8:
        collect(p[10], c, val=False)
    p[0] = [c]

def p_typeattribute_def(p):
    '''typeattribute_def : TYPEATTRIBUTE IDENTIFIER comma_list SEMI'''
    t = refpolicy.TypeAttribute()
    t.type = p[2]
    t.attributes.update(p[3])
    p[0] = t

def p_roleattribute_def(p):
    '''roleattribute_def : ROLEATTRIBUTE IDENTIFIER comma_list SEMI'''
    t = refpolicy.RoleAttribute()
    t.role = p[2]
    t.roleattributes.update(p[3])
    p[0] = t

def p_range_transition_def(p):
    '''range_transition_def : RANGE_TRANSITION names names COLON names mls_range_def SEMI
                            | RANGE_TRANSITION names names names SEMI'''
    pass

def p_role_transition_def(p):
    '''role_transition_def : ROLE_TRANSITION names names names SEMI'''
    pass

def p_cond_expr(p):
    '''cond_expr : IDENTIFIER
                 | EXPL cond_expr
                 | cond_expr AMP AMP cond_expr
                 | cond_expr BAR BAR cond_expr
                 | cond_expr EQUAL EQUAL cond_expr
                 | cond_expr EXPL EQUAL cond_expr
    '''
    l = len(p)
    if l == 2:
        p[0] = [p[1]]
    elif l == 3:
        p[0] = [p[1]] + p[2]
    else:
        p[0] = p[1] + [p[2] + p[3]] + p[4]

#
# Basic terminals
#

# Identifiers and lists of identifiers. These must
# be handled somewhat gracefully. Names returns an IdSet and care must
# be taken that this is _assigned_ to an object to correctly update
# all of the flags (as opposed to using update). The other terminals
# return list - this is to preserve ordering if it is important for
# parsing (for example, interface_call must retain the ordering). Other
# times the list should be used to update an IdSet.

def p_names(p):
    '''names : identifier
             | nested_id_set
             | asterisk
             | TILDE identifier
             | TILDE nested_id_set
             | IDENTIFIER MINUS IDENTIFIER
    '''
    s = refpolicy.IdSet()
    if len(p) < 3:
        expand(p[1], s)
    elif len(p) == 3:
        expand(p[2], s)
        s.compliment = True
    else:
        expand([p[1]])
        s.add("-" + p[3])
    p[0] = s

def p_identifier(p):
    'identifier : IDENTIFIER'
    p[0] = [p[1]]

def p_asterisk(p):
    'asterisk : ASTERISK'
    p[0] = [p[1]]

def p_nested_id_set(p):
    '''nested_id_set : OBRACE nested_id_list CBRACE
    '''
    p[0] = p[2]

def p_nested_id_list(p):
    '''nested_id_list : nested_id_element
                      | nested_id_list nested_id_element
    '''
    if len(p) == 2:
        p[0] = p[1]
    else:
        p[0] = p[1] + p[2]

def p_nested_id_element(p):
    '''nested_id_element : identifier
                         | MINUS IDENTIFIER
                         | nested_id_set
    '''
    if len(p) == 2:
        p[0] = p[1]
    else:
        # For now just leave the '-'
        str = "-" + p[2]
        p[0] = [str]

def p_comma_list(p):
    '''comma_list : nested_id_list
                  | comma_list COMMA nested_id_list
    '''
    if len(p) > 2:
        p[1] = p[1] + p[3]
    p[0] = p[1]

def p_optional_semi(p):
    '''optional_semi : SEMI
                   | empty'''
    pass

#
# Interface to the parser
#

def p_error(tok):
    global error, parse_file, success, parser
    error = "%s: Syntax error on line %d %s [type=%s]" % (parse_file, tok.lineno, tok.value, tok.type)
    print(error)
    success = False

def prep_spt(spt):
    if not spt:
        return { }
    map = {}
    for x in spt:
        map[x.name] = x

parser = None
lexer = None
def create_globals(module, support, debug):
    global parser, lexer, m, spt

if not parser:
        lexer = lex.lex()
        parser = yacc.yacc(method="LALR", debug=debug, write_tables=0)

if module is not None:
        m = module
    else:
        m = refpolicy.Module()

if not support:
        spt = refpolicy.SupportMacros()
    else:
        spt = support

def parse(text, module=None, support=None, debug=False):
    create_globals(module, support, debug)
    global error, parser, lexer, success

lexer.lineno = 1
    success = True

try:
        parser.parse(text, debug=debug, lexer=lexer)
    except Exception as e:
        parser = None
        lexer = None
        error = "internal parser error: %s" % str(e) + "\n" + traceback.format_exc()

if not success:
        # force the parser and lexer to be rebuilt - we have some problems otherwise
        parser = None
        msg = 'could not parse text: "%s"' % error
        raise ValueError(msg)
    return m

def list_headers(root):
    modules = []
    support_macros = None

for dirpath, dirnames, filenames in os.walk(root):
        for name in filenames:
            modname = os.path.splitext(name)
            filename = os.path.join(dirpath, name)

if modname[1] == '.spt':
                if name == "obj_perm_sets.spt":
                    support_macros = filename
                elif len(re.findall("patterns", modname[0])):
                    modules.append((modname[0], filename))
            elif modname[1] == '.if':
                modules.append((modname[0], filename))

return (modules, support_macros)

def parse_headers(root, output=None, expand=True, debug=False):
    from . import util

headers = refpolicy.Headers()

modules = []
    support_macros = None

if os.path.isfile(root):
        name = os.path.split(root)[1]
        if name == '':
            raise ValueError("Invalid file name %s" % root)
        modname = os.path.splitext(name)
        modules.append((modname[0], root))
        all_modules, support_macros = list_headers(defaults.headers())
    else:
        modules, support_macros = list_headers(root)

if expand and not support_macros:
        raise ValueError("could not find support macros (obj_perm_sets.spt)")

def o(msg):
        if output:
            output.write(msg)

def parse_file(f, module, spt=None):
        global parse_file
        if debug:
            o("parsing file %s\n" % f)
        try:
            fd = open(f)
            txt = fd.read()
            fd.close()
            parse_file = f
            parse(txt, module, spt, debug)
        except IOError as e:
            return
        except ValueError as e:
            raise ValueError("error parsing file %s: %s" % (f, str(e)))

spt = None
    if support_macros:
        o("Parsing support macros (%s): " % support_macros)
        spt = refpolicy.SupportMacros()
        parse_file(support_macros, spt)

headers.children.append(spt)

# FIXME: Total hack - add in can_exec rather than parse the insanity
        # of misc_macros. We are just going to pretend that this is an interface
        # to make the expansion work correctly.
        can_exec = refpolicy.Interface("can_exec")
        av = access.AccessVector(["$1","$2","file","execute_no_trans","open", "read",
                                  "getattr","lock","execute","ioctl"])

can_exec.children.append(refpolicy.AVRule(av))
        headers.children.append(can_exec)

o("done.\n")

if output and not debug:
        status = util.ConsoleProgressBar(sys.stdout, steps=len(modules))
        status.start("Parsing interface files")

failures = []
    for x in modules:
        m = refpolicy.Module()
        m.name = x[0]
        try:
            if expand:
                parse_file(x[1], m, spt)
            else:
                parse_file(x[1], m)
        except ValueError as e:
            o(str(e) + "\n")
            failures.append(x[1])
            continue

headers.children.append(m)
        if output and not debug:
            status.step()

if len(failures):
        o("failed to parse some headers: %s\n" % ", ".join(failures))

return headers

Batal