mirror of
https://github.com/Grasscutters/mitmproxy.git
synced 2024-11-26 02:10:59 +00:00
541 lines
14 KiB
Python
541 lines
14 KiB
Python
import operator
|
|
import os
|
|
import abc
|
|
import functools
|
|
import pyparsing as pp
|
|
from mitmproxy.utils import strutils
|
|
from mitmproxy.utils import human
|
|
import typing # noqa
|
|
from . import generators
|
|
from . import exceptions
|
|
|
|
|
|
class Settings:
|
|
|
|
def __init__(
|
|
self,
|
|
is_client=False,
|
|
staticdir=None,
|
|
unconstrained_file_access=False,
|
|
request_host=None,
|
|
websocket_key=None,
|
|
protocol=None,
|
|
):
|
|
self.is_client = is_client
|
|
self.staticdir = staticdir
|
|
self.unconstrained_file_access = unconstrained_file_access
|
|
self.request_host = request_host
|
|
self.websocket_key = websocket_key # TODO: refactor this into the protocol
|
|
self.protocol = protocol
|
|
|
|
|
|
Sep = pp.Optional(pp.Literal(":")).suppress()
|
|
|
|
|
|
v_integer = pp.Word(pp.nums)\
|
|
.setName("integer")\
|
|
.setParseAction(lambda toks: int(toks[0]))
|
|
|
|
|
|
v_literal = pp.MatchFirst(
|
|
[
|
|
pp.QuotedString(
|
|
"\"",
|
|
unquoteResults=True,
|
|
multiline=True
|
|
),
|
|
pp.QuotedString(
|
|
"'",
|
|
unquoteResults=True,
|
|
multiline=True
|
|
),
|
|
]
|
|
)
|
|
|
|
v_naked_literal = pp.MatchFirst(
|
|
[
|
|
v_literal,
|
|
pp.Word("".join(i for i in pp.printables if i not in ",:\n@\'\""))
|
|
]
|
|
)
|
|
|
|
|
|
class Token:
|
|
|
|
"""
|
|
A token in the specification language. Tokens are immutable. The token
|
|
classes have no meaning in and of themselves, and are combined into
|
|
Components and Actions to build the language.
|
|
"""
|
|
__metaclass__ = abc.ABCMeta
|
|
|
|
@classmethod
|
|
def expr(cls): # pragma: no cover
|
|
"""
|
|
A parse expression.
|
|
"""
|
|
return None
|
|
|
|
@abc.abstractmethod
|
|
def spec(self): # pragma: no cover
|
|
"""
|
|
A parseable specification for this token.
|
|
"""
|
|
return None
|
|
|
|
@property
|
|
def unique_name(self) -> typing.Optional[str]:
|
|
"""
|
|
Controls uniqueness constraints for tokens. No two tokens with the
|
|
same name will be allowed. If no uniquness should be applied, this
|
|
should be None.
|
|
"""
|
|
return self.__class__.__name__.lower()
|
|
|
|
def resolve(self, settings_, msg_):
|
|
"""
|
|
Resolves this token to ready it for transmission. This means that
|
|
the calculated offsets of actions are fixed.
|
|
|
|
settings: a language.Settings instance
|
|
msg: The containing message
|
|
"""
|
|
return self
|
|
|
|
def __repr__(self):
|
|
return self.spec()
|
|
|
|
|
|
class _TokValueLiteral(Token):
|
|
|
|
def __init__(self, val):
|
|
self.val = strutils.escaped_str_to_bytes(val)
|
|
|
|
def get_generator(self, settings_):
|
|
return self.val
|
|
|
|
def freeze(self, settings_):
|
|
return self
|
|
|
|
|
|
class TokValueLiteral(_TokValueLiteral):
|
|
|
|
"""
|
|
A literal with Python-style string escaping
|
|
"""
|
|
@classmethod
|
|
def expr(cls):
|
|
e = v_literal.copy()
|
|
return e.setParseAction(cls.parseAction)
|
|
|
|
@classmethod
|
|
def parseAction(cls, x):
|
|
v = cls(*x)
|
|
return v
|
|
|
|
def spec(self):
|
|
inner = strutils.bytes_to_escaped_str(self.val)
|
|
inner = inner.replace(r"'", r"\x27")
|
|
return "'" + inner + "'"
|
|
|
|
|
|
class TokValueNakedLiteral(_TokValueLiteral):
|
|
|
|
@classmethod
|
|
def expr(cls):
|
|
e = v_naked_literal.copy()
|
|
return e.setParseAction(lambda x: cls(*x))
|
|
|
|
def spec(self):
|
|
return strutils.bytes_to_escaped_str(self.val, escape_single_quotes=True)
|
|
|
|
|
|
class TokValueGenerate(Token):
|
|
|
|
def __init__(self, usize, unit, datatype):
|
|
if not unit:
|
|
unit = "b"
|
|
self.usize, self.unit, self.datatype = usize, unit, datatype
|
|
|
|
def bytes(self):
|
|
return self.usize * human.SIZE_UNITS[self.unit]
|
|
|
|
def get_generator(self, settings_):
|
|
return generators.RandomGenerator(self.datatype, self.bytes())
|
|
|
|
def freeze(self, settings):
|
|
g = self.get_generator(settings)
|
|
return TokValueLiteral(strutils.bytes_to_escaped_str(g[:], escape_single_quotes=True))
|
|
|
|
@classmethod
|
|
def expr(cls):
|
|
e = pp.Literal("@").suppress() + v_integer
|
|
|
|
u = functools.reduce(
|
|
operator.or_,
|
|
[pp.Literal(i) for i in human.SIZE_UNITS.keys()]
|
|
).leaveWhitespace()
|
|
e = e + pp.Optional(u, default=None)
|
|
|
|
s = pp.Literal(",").suppress()
|
|
s += functools.reduce(
|
|
operator.or_,
|
|
[pp.Literal(i) for i in generators.DATATYPES.keys()]
|
|
)
|
|
e += pp.Optional(s, default="bytes")
|
|
return e.setParseAction(lambda x: cls(*x))
|
|
|
|
def spec(self):
|
|
s = "@%s" % self.usize
|
|
if self.unit != "b":
|
|
s += self.unit
|
|
if self.datatype != "bytes":
|
|
s += ",%s" % self.datatype
|
|
return s
|
|
|
|
|
|
class TokValueFile(Token):
|
|
|
|
def __init__(self, path):
|
|
self.path = str(path)
|
|
|
|
@classmethod
|
|
def expr(cls):
|
|
e = pp.Literal("<").suppress()
|
|
e = e + v_naked_literal
|
|
return e.setParseAction(lambda x: cls(*x))
|
|
|
|
def freeze(self, settings_):
|
|
return self
|
|
|
|
def get_generator(self, settings):
|
|
if not settings.staticdir:
|
|
raise exceptions.FileAccessDenied("File access disabled.")
|
|
s = os.path.expanduser(self.path)
|
|
s = os.path.normpath(
|
|
os.path.abspath(os.path.join(settings.staticdir, s))
|
|
)
|
|
uf = settings.unconstrained_file_access
|
|
if not uf and not s.startswith(os.path.normpath(settings.staticdir)):
|
|
raise exceptions.FileAccessDenied(
|
|
"File access outside of configured directory"
|
|
)
|
|
if not os.path.isfile(s):
|
|
raise exceptions.FileAccessDenied("File not readable")
|
|
return generators.FileGenerator(s)
|
|
|
|
def spec(self):
|
|
return "<'%s'" % self.path
|
|
|
|
|
|
TokValue = pp.MatchFirst(
|
|
[
|
|
TokValueGenerate.expr(),
|
|
TokValueFile.expr(),
|
|
TokValueLiteral.expr()
|
|
]
|
|
)
|
|
|
|
|
|
TokNakedValue = pp.MatchFirst(
|
|
[
|
|
TokValueGenerate.expr(),
|
|
TokValueFile.expr(),
|
|
TokValueLiteral.expr(),
|
|
TokValueNakedLiteral.expr(),
|
|
]
|
|
)
|
|
|
|
|
|
TokOffset = pp.MatchFirst(
|
|
[
|
|
v_integer,
|
|
pp.Literal("r"),
|
|
pp.Literal("a")
|
|
]
|
|
)
|
|
|
|
|
|
class _Component(Token):
|
|
|
|
"""
|
|
A value component of the primary specification of an message.
|
|
Components produce byte values describing the bytes of the message.
|
|
"""
|
|
|
|
def values(self, settings): # pragma: no cover
|
|
"""
|
|
A sequence of values, which can either be strings or generators.
|
|
"""
|
|
pass
|
|
|
|
def string(self, settings=None):
|
|
"""
|
|
A bytestring representation of the object.
|
|
"""
|
|
return b"".join(i[:] for i in self.values(settings or {}))
|
|
|
|
|
|
class KeyValue(_Component):
|
|
|
|
"""
|
|
A key/value pair.
|
|
cls.preamble: leader
|
|
"""
|
|
|
|
def __init__(self, key, value):
|
|
self.key, self.value = key, value
|
|
|
|
@classmethod
|
|
def expr(cls):
|
|
e = pp.Literal(cls.preamble).suppress()
|
|
e += TokValue
|
|
e += pp.Literal("=").suppress()
|
|
e += TokValue
|
|
return e.setParseAction(lambda x: cls(*x))
|
|
|
|
def spec(self):
|
|
return "%s%s=%s" % (self.preamble, self.key.spec(), self.value.spec())
|
|
|
|
def freeze(self, settings):
|
|
return self.__class__(
|
|
self.key.freeze(settings), self.value.freeze(settings)
|
|
)
|
|
|
|
|
|
class CaselessLiteral(_Component):
|
|
|
|
"""
|
|
A caseless token that can take only one value.
|
|
"""
|
|
|
|
def __init__(self, value):
|
|
self.value = value
|
|
|
|
@classmethod
|
|
def expr(cls):
|
|
spec = pp.CaselessLiteral(cls.TOK)
|
|
spec = spec.setParseAction(lambda x: cls(*x))
|
|
return spec
|
|
|
|
def values(self, settings):
|
|
return self.TOK
|
|
|
|
def spec(self):
|
|
return self.TOK
|
|
|
|
def freeze(self, settings_):
|
|
return self
|
|
|
|
|
|
class OptionsOrValue(_Component):
|
|
|
|
"""
|
|
Can be any of a specified set of options, or a value specifier.
|
|
"""
|
|
preamble = ""
|
|
options = [] # type: typing.List[str]
|
|
|
|
def __init__(self, value):
|
|
# If it's a string, we were passed one of the options, so we lower-case
|
|
# it to be canonical. The user can specify a different case by using a
|
|
# string value literal.
|
|
self.option_used = False
|
|
if isinstance(value, str):
|
|
for i in self.options:
|
|
# Find the exact option value in a case-insensitive way
|
|
if i.lower() == value.lower():
|
|
self.option_used = True
|
|
value = TokValueLiteral(i)
|
|
break
|
|
self.value = value
|
|
|
|
@classmethod
|
|
def expr(cls):
|
|
parts = [pp.CaselessLiteral(i) for i in cls.options]
|
|
m = pp.MatchFirst(parts)
|
|
spec = m | TokValue.copy()
|
|
spec = spec.setParseAction(lambda x: cls(*x))
|
|
if cls.preamble:
|
|
spec = pp.Literal(cls.preamble).suppress() + spec
|
|
return spec
|
|
|
|
def values(self, settings):
|
|
return [
|
|
self.value.get_generator(settings)
|
|
]
|
|
|
|
def spec(self):
|
|
s = self.value.spec()
|
|
if s[1:-1].lower() in self.options:
|
|
s = s[1:-1].lower()
|
|
return "%s%s" % (self.preamble, s)
|
|
|
|
def freeze(self, settings):
|
|
return self.__class__(self.value.freeze(settings))
|
|
|
|
|
|
class Integer(_Component):
|
|
bounds = (None, None) # type: typing.Tuple[typing.Optional[int], typing.Optional[int]]
|
|
preamble = ""
|
|
|
|
def __init__(self, value):
|
|
v = int(value)
|
|
outofbounds = any([
|
|
self.bounds[0] is not None and v < self.bounds[0],
|
|
self.bounds[1] is not None and v > self.bounds[1]
|
|
])
|
|
if outofbounds:
|
|
raise exceptions.ParseException(
|
|
"Integer value must be between %s and %s." % self.bounds,
|
|
0, 0
|
|
)
|
|
self.value = str(value).encode()
|
|
|
|
@classmethod
|
|
def expr(cls):
|
|
e = v_integer.copy()
|
|
if cls.preamble:
|
|
e = pp.Literal(cls.preamble).suppress() + e
|
|
return e.setParseAction(lambda x: cls(*x))
|
|
|
|
def values(self, settings):
|
|
return [self.value]
|
|
|
|
def spec(self):
|
|
return "%s%s" % (self.preamble, self.value.decode())
|
|
|
|
def freeze(self, settings_):
|
|
return self
|
|
|
|
|
|
class Value(_Component):
|
|
|
|
"""
|
|
A value component lead by an optional preamble.
|
|
"""
|
|
preamble = ""
|
|
|
|
def __init__(self, value):
|
|
self.value = value
|
|
|
|
@classmethod
|
|
def expr(cls):
|
|
e = (TokValue | TokNakedValue)
|
|
if cls.preamble:
|
|
e = pp.Literal(cls.preamble).suppress() + e
|
|
return e.setParseAction(lambda x: cls(*x))
|
|
|
|
def values(self, settings):
|
|
return [self.value.get_generator(settings)]
|
|
|
|
def spec(self):
|
|
return "%s%s" % (self.preamble, self.value.spec())
|
|
|
|
def freeze(self, settings):
|
|
return self.__class__(self.value.freeze(settings))
|
|
|
|
|
|
class FixedLengthValue(Value):
|
|
|
|
"""
|
|
A value component lead by an optional preamble.
|
|
"""
|
|
preamble = ""
|
|
length = None # type: typing.Optional[int]
|
|
|
|
def __init__(self, value):
|
|
Value.__init__(self, value)
|
|
lenguess = None
|
|
try:
|
|
lenguess = len(value.get_generator(Settings()))
|
|
except exceptions.RenderError:
|
|
pass
|
|
# This check will fail if we know the length upfront
|
|
if lenguess is not None and lenguess != self.length:
|
|
raise exceptions.RenderError(
|
|
"Invalid value length: '%s' is %s bytes, should be %s." % (
|
|
self.spec(),
|
|
lenguess,
|
|
self.length
|
|
)
|
|
)
|
|
|
|
def values(self, settings):
|
|
ret = Value.values(self, settings)
|
|
l = sum(len(i) for i in ret)
|
|
# This check will fail if we don't know the length upfront - i.e. for
|
|
# file inputs
|
|
if l != self.length:
|
|
raise exceptions.RenderError(
|
|
"Invalid value length: '%s' is %s bytes, should be %s." % (
|
|
self.spec(),
|
|
l,
|
|
self.length
|
|
)
|
|
)
|
|
return ret
|
|
|
|
|
|
class Boolean(_Component):
|
|
|
|
"""
|
|
A boolean flag.
|
|
name = true
|
|
-name = false
|
|
"""
|
|
name = ""
|
|
|
|
def __init__(self, value):
|
|
self.value = value
|
|
|
|
@classmethod
|
|
def expr(cls):
|
|
e = pp.Optional(pp.Literal("-"), default=True)
|
|
e += pp.Literal(cls.name).suppress()
|
|
|
|
def parse(s_, loc_, toks):
|
|
val = True
|
|
if toks[0] == "-":
|
|
val = False
|
|
return cls(val)
|
|
|
|
return e.setParseAction(parse)
|
|
|
|
def spec(self):
|
|
return "%s%s" % ("-" if not self.value else "", self.name)
|
|
|
|
|
|
class IntField(_Component):
|
|
|
|
"""
|
|
An integer field, where values can optionally specified by name.
|
|
"""
|
|
names = {} # type: typing.Dict[str, int]
|
|
max = 16
|
|
preamble = ""
|
|
|
|
def __init__(self, value):
|
|
self.origvalue = value
|
|
self.value = self.names.get(value, value)
|
|
if self.value > self.max:
|
|
raise exceptions.ParseException(
|
|
"Value can't exceed %s" % self.max, 0, 0
|
|
)
|
|
|
|
@classmethod
|
|
def expr(cls):
|
|
parts = [pp.CaselessLiteral(i) for i in cls.names.keys()]
|
|
m = pp.MatchFirst(parts)
|
|
spec = m | v_integer.copy()
|
|
spec = spec.setParseAction(lambda x: cls(*x))
|
|
if cls.preamble:
|
|
spec = pp.Literal(cls.preamble).suppress() + spec
|
|
return spec
|
|
|
|
def values(self, settings):
|
|
return [str(self.value)]
|
|
|
|
def spec(self):
|
|
return "%s%s" % (self.preamble, self.origvalue)
|