938 lines
24 KiB
Python
938 lines
24 KiB
Python
import operator, string, random, mmap, os, time, copy
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import abc
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from email.utils import formatdate
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import contrib.pyparsing as pp
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from netlib import http_status, tcp
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import utils
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BLOCKSIZE = 1024
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TRUNCATE = 1024
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class FileAccessDenied(Exception): pass
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class ParseException(Exception):
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def __init__(self, msg, s, col):
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Exception.__init__(self)
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self.msg = msg
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self.s = s
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self.col = col
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def marked(self):
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return "%s\n%s"%(self.s, " "*(self.col-1) + "^")
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def __str__(self):
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return "%s at char %s"%(self.msg, self.col)
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def send_chunk(fp, val, blocksize, start, end):
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"""
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(start, end): Inclusive lower bound, exclusive upper bound.
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"""
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for i in range(start, end, blocksize):
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fp.write(
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val[i:min(i+blocksize, end)]
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)
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return end-start
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def write_values(fp, vals, actions, sofar=0, skip=0, blocksize=BLOCKSIZE):
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"""
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vals: A list of values, which may be strings or Value objects.
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actions: A list of (offset, action, arg) tuples. Action may be "pause" or "disconnect".
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Both vals and actions are in reverse order, with the first items last.
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Return True if connection should disconnect.
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"""
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sofar = 0
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try:
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while vals:
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v = vals.pop()
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offset = 0
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while actions and actions[-1][0] < (sofar + len(v)):
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a = actions.pop()
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offset += send_chunk(fp, v, blocksize, offset, a[0]-sofar-offset)
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if a[1] == "pause":
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time.sleep(a[2])
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elif a[1] == "disconnect":
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return True
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elif a[1] == "inject":
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send_chunk(fp, a[2], blocksize, 0, len(a[2]))
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send_chunk(fp, v, blocksize, offset, len(v))
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sofar += len(v)
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# Remainders
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while actions:
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a = actions.pop()
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if a[1] == "pause":
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time.sleep(a[2])
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elif a[1] == "disconnect":
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return True
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elif a[1] == "inject":
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send_chunk(fp, a[2], blocksize, 0, len(a[2]))
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except tcp.NetLibDisconnect: # pragma: no cover
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return True
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DATATYPES = dict(
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ascii_letters = string.ascii_letters,
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ascii_lowercase = string.ascii_lowercase,
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ascii_uppercase = string.ascii_uppercase,
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digits = string.digits,
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hexdigits = string.hexdigits,
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octdigits = string.octdigits,
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punctuation = string.punctuation,
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whitespace = string.whitespace,
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ascii = string.printable,
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bytes = "".join(chr(i) for i in range(256))
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)
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v_integer = pp.Regex(r"\d+")\
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.setName("integer")\
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.setParseAction(lambda toks: int(toks[0]))
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v_literal = pp.MatchFirst(
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[
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pp.QuotedString("\"", escChar="\\", unquoteResults=True, multiline=True),
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pp.QuotedString("'", escChar="\\", unquoteResults=True, multiline=True),
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]
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)
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v_naked_literal = pp.MatchFirst(
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[
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v_literal,
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pp.Word("".join(i for i in pp.printables if i not in ",:\n"))
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]
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)
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class LiteralGenerator:
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def __init__(self, s):
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self.s = s
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def __len__(self):
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return len(self.s)
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def __getitem__(self, x):
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return self.s.__getitem__(x)
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def __getslice__(self, a, b):
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return self.s.__getslice__(a, b)
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def __repr__(self):
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return '"%s"'%self.s
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class RandomGenerator:
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def __init__(self, dtype, length):
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self.dtype = dtype
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self.length = length
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def __len__(self):
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return self.length
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def __getitem__(self, x):
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return random.choice(DATATYPES[self.dtype])
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def __getslice__(self, a, b):
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b = min(b, self.length)
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chars = DATATYPES[self.dtype]
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return "".join(random.choice(chars) for x in range(a, b))
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def __repr__(self):
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return "%s random from %s"%(self.length, self.dtype)
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class FileGenerator:
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def __init__(self, path):
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self.path = path
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self.fp = file(path, "r")
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self.map = mmap.mmap(self.fp.fileno(), 0, prot=mmap.PROT_READ)
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def __len__(self):
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return len(self.map)
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def __getitem__(self, x):
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return self.map.__getitem__(x)
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def __getslice__(self, a, b):
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return self.map.__getslice__(a, b)
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def __repr__(self):
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return "<%s"%self.path
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class _Value(object):
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__metaclass__ = abc.ABCMeta
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def __repr__(self):
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return self.spec()
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@abc.abstractmethod
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def spec(self): # pragma: no cover
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return None
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@abc.abstractmethod
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def expr(self): # pragma: no cover
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return None
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class _ValueLiteral(_Value):
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def __init__(self, val):
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self.val = val.decode("string_escape")
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def get_generator(self, settings):
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return LiteralGenerator(self.val)
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class ValueLiteral(_ValueLiteral):
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@classmethod
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def expr(klass):
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e = v_literal.copy()
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return e.setParseAction(lambda x: klass(*x))
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def spec(self):
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return '"%s"'%self.val.encode("string_escape")
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class ValueNakedLiteral(_ValueLiteral):
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@classmethod
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def expr(klass):
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e = v_naked_literal.copy()
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return e.setParseAction(lambda x: klass(*x))
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def spec(self):
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return self.val.encode("string_escape")
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class ValueGenerate(_Value):
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def __init__(self, usize, unit, datatype):
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if not unit:
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unit = "b"
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self.usize, self.unit, self.datatype = usize, unit, datatype
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def bytes(self):
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return self.usize * utils.SIZE_UNITS[self.unit]
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def get_generator(self, settings):
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return RandomGenerator(self.datatype, self.bytes())
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@classmethod
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def expr(klass):
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e = pp.Literal("@").suppress() + v_integer
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u = reduce(operator.or_, [pp.Literal(i) for i in utils.SIZE_UNITS.keys()])
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e = e + pp.Optional(u, default=None)
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s = pp.Literal(",").suppress()
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s += reduce(operator.or_, [pp.Literal(i) for i in DATATYPES.keys()])
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e += pp.Optional(s, default="bytes")
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return e.setParseAction(lambda x: klass(*x))
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def spec(self):
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s = "@%s"%self.usize
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if self.unit != "b":
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s += self.unit
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if self.datatype != "bytes":
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s += ",%s"%self.datatype
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return s
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class ValueFile(_Value):
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def __init__(self, path):
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self.path = path
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@classmethod
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def expr(klass):
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e = pp.Literal("<").suppress()
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e = e + v_naked_literal
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return e.setParseAction(lambda x: klass(*x))
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def get_generator(self, settings):
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uf = settings.get("unconstrained_file_access")
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sd = settings.get("staticdir")
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if not sd:
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raise FileAccessDenied("File access disabled.")
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sd = os.path.normpath(os.path.abspath(sd))
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s = os.path.expanduser(self.path)
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s = os.path.normpath(os.path.abspath(os.path.join(sd, s)))
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if not uf and not s.startswith(sd):
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raise FileAccessDenied("File access outside of configured directory")
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if not os.path.isfile(s):
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raise FileAccessDenied("File not readable")
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return FileGenerator(s)
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def spec(self):
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return '<"%s"'%self.path.encode("string_escape")
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Value = pp.MatchFirst(
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[
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ValueGenerate.expr(),
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ValueFile.expr(),
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ValueLiteral.expr()
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]
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)
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NakedValue = pp.MatchFirst(
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[
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ValueGenerate.expr(),
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ValueFile.expr(),
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ValueLiteral.expr(),
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ValueNakedLiteral.expr(),
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]
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)
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Offset = pp.MatchFirst(
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[
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v_integer,
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pp.Literal("r"),
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pp.Literal("a")
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]
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)
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class _Spec(object):
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"""
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A specification token.
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"""
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__metaclass__ = abc.ABCMeta
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@abc.abstractmethod
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def expr(klass): # pragma: no cover
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"""
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A parse expression.
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"""
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return None
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def spec(self): # pragma: no cover
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"""
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A parseable specification for this token.
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"""
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return None
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class Raw(_Spec):
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@classmethod
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def expr(klass):
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e = pp.Literal("r").suppress()
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return e.setParseAction(lambda x: klass(*x))
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def spec(self):
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return "r"
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class _Component(_Spec):
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"""
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A value component of the primary specification of an HTTP message.
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"""
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@abc.abstractmethod
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def values(self, settings): # pragma: no cover
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"""
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A sequence of value objects.
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"""
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return None
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def string(self, settings=None):
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"""
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A string representation of the object.
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"""
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return "".join(i[:] for i in self.values(settings or {}))
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class _Header(_Component):
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def __init__(self, key, value):
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self.key, self.value = key, value
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def values(self, settings):
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return [
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self.key.get_generator(settings),
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": ",
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self.value.get_generator(settings),
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"\r\n",
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]
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class Header(_Header):
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@classmethod
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def expr(klass):
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e = pp.Literal("h").suppress()
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e += Value
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e += pp.Literal("=").suppress()
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e += Value
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return e.setParseAction(lambda x: klass(*x))
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def spec(self):
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return "h%s=%s"%(self.key.spec(), self.value.spec())
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class ShortcutContentType(_Header):
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def __init__(self, value):
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_Header.__init__(self, ValueLiteral("Content-Type"), value)
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@classmethod
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def expr(klass):
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e = pp.Literal("c").suppress()
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e = e + Value
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return e.setParseAction(lambda x: klass(*x))
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def spec(self):
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return "c%s"%(self.value.spec())
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class ShortcutLocation(_Header):
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def __init__(self, value):
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_Header.__init__(self, ValueLiteral("Location"), value)
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@classmethod
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def expr(klass):
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e = pp.Literal("l").suppress()
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e = e + Value
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return e.setParseAction(lambda x: klass(*x))
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def spec(self):
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return "l%s"%(self.value.spec())
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class Body(_Component):
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def __init__(self, value):
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self.value = value
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@classmethod
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def expr(klass):
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e = pp.Literal("b").suppress()
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e = e + Value
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return e.setParseAction(lambda x: klass(*x))
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def values(self, settings):
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return [
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self.value.get_generator(settings),
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]
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def spec(self):
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return "b%s"%(self.value.spec())
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class Path(_Component):
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def __init__(self, value):
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if isinstance(value, basestring):
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value = ValueLiteral(value)
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self.value = value
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@classmethod
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def expr(klass):
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e = NakedValue.copy()
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return e.setParseAction(lambda x: klass(*x))
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def values(self, settings):
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return [
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self.value.get_generator(settings),
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]
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def spec(self):
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return "%s"%(self.value.spec())
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class Method(_Component):
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methods = [
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"get",
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"head",
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"post",
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"put",
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"delete",
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"options",
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"trace",
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"connect",
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]
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def __init__(self, value):
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# If it's a string, we were passed one of the methods, so we upper-case
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# it to be canonical. The user can specify a different case by using a
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# string value literal.
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if isinstance(value, basestring):
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value = ValueLiteral(value.upper())
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self.value = value
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@classmethod
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def expr(klass):
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parts = [pp.CaselessLiteral(i) for i in klass.methods]
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m = pp.MatchFirst(parts)
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spec = m | Value.copy()
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spec = spec.setParseAction(lambda x: klass(*x))
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return spec
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def values(self, settings):
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return [
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self.value.get_generator(settings)
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]
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def spec(self):
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s = self.value.spec()
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if s[1:-1].lower() in self.methods:
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s = s[1:-1].lower()
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return "%s"%s
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class Code(_Component):
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def __init__(self, code):
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self.code = str(code)
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@classmethod
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def expr(klass):
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e = v_integer.copy()
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return e.setParseAction(lambda x: klass(*x))
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def values(self, settings):
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return [LiteralGenerator(self.code)]
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def spec(self):
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return "%s"%(self.code)
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|
|
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class Reason(_Component):
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def __init__(self, value):
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self.value = value
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|
@classmethod
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def expr(klass):
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e = pp.Literal("m").suppress()
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e = e + Value
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return e.setParseAction(lambda x: klass(*x))
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def values(self, settings):
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return [self.value.get_generator(settings)]
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def spec(self):
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return "m%s"%(self.value.spec())
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|
|
|
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class _Action(_Spec):
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"""
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|
An action that operates on the raw data stream of the message. All
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actions have one thing in common: an offset that specifies where the
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action should take place.
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"""
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def __init__(self, offset):
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self.offset = offset
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def resolve_offset(self, msg, settings, request_host):
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"""
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|
Resolves offset specifications to a numeric offset. Returns a copy
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of the action object.
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"""
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c = copy.copy(self)
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l = msg.length(settings, request_host)
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if c.offset == "r":
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c.offset = random.randrange(l)
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elif c.offset == "a":
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c.offset = l + 1
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return c
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|
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def __cmp__(self, other):
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return cmp(self.offset, other.offset)
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|
|
def __repr__(self):
|
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return self.spec()
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|
|
|
@abc.abstractmethod
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|
def spec(self): # pragma: no cover
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pass
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|
|
@abc.abstractmethod
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|
def intermediate(self): # pragma: no cover
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pass
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|
|
|
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class PauseAt(_Action):
|
|
def __init__(self, offset, seconds):
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_Action.__init__(self, offset)
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self.seconds = seconds
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|
|
|
@classmethod
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def expr(klass):
|
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e = pp.Literal("p").suppress()
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e += Offset
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e += pp.Literal(",").suppress()
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e += pp.MatchFirst(
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[
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v_integer,
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pp.Literal("f")
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]
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)
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return e.setParseAction(lambda x: klass(*x))
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|
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def spec(self):
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return "p%s,%s"%(self.offset, self.seconds)
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|
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def intermediate(self, settings):
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return (self.offset, "pause", self.seconds)
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|
|
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class DisconnectAt(_Action):
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def __init__(self, offset):
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_Action.__init__(self, offset)
|
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|
|
@classmethod
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|
def expr(klass):
|
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e = pp.Literal("d").suppress()
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e += Offset
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return e.setParseAction(lambda x: klass(*x))
|
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|
|
def spec(self):
|
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return "d%s"%self.offset
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|
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def intermediate(self, settings):
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return (self.offset, "disconnect")
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|
|
|
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class InjectAt(_Action):
|
|
def __init__(self, offset, value):
|
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_Action.__init__(self, offset)
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self.value = value
|
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|
|
@classmethod
|
|
def expr(klass):
|
|
e = pp.Literal("i").suppress()
|
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e += Offset
|
|
e += pp.Literal(",").suppress()
|
|
e += Value
|
|
return e.setParseAction(lambda x: klass(*x))
|
|
|
|
def spec(self):
|
|
return "i%s,%s"%(self.offset, self.value.spec())
|
|
|
|
def intermediate(self, settings):
|
|
return (
|
|
self.offset,
|
|
"inject",
|
|
self.value.get_generator(settings)
|
|
)
|
|
|
|
|
|
class _Message(object):
|
|
__metaclass__ = abc.ABCMeta
|
|
version = "HTTP/1.1"
|
|
def __init__(self, tokens):
|
|
self.tokens = tokens
|
|
|
|
def _get_tokens(self, klass):
|
|
return [i for i in self.tokens if isinstance(i, klass)]
|
|
|
|
def _get_token(self, klass):
|
|
l = self._get_tokens(klass)
|
|
if l:
|
|
return l[0]
|
|
|
|
@property
|
|
def raw(self):
|
|
return bool(self._get_token(Raw))
|
|
|
|
@property
|
|
def actions(self):
|
|
return self._get_tokens(_Action)
|
|
|
|
@property
|
|
def body(self):
|
|
return self._get_token(Body)
|
|
|
|
@property
|
|
def headers(self):
|
|
return self._get_tokens(_Header)
|
|
|
|
def length(self, settings, request_host):
|
|
"""
|
|
Calculate the length of the base message without any applied actions.
|
|
"""
|
|
l = sum(len(x) for x in self.preamble(settings))
|
|
l += 2
|
|
for h in self.headervals(settings, request_host):
|
|
l += len(h)
|
|
l += 2
|
|
if self.body:
|
|
l += len(self.body.value.get_generator(settings))
|
|
return l
|
|
|
|
def preview_safe(self):
|
|
"""
|
|
Modify this message to be safe for previews. Returns a list of elided actions.
|
|
"""
|
|
pauses = [i for i in self.actions if isinstance(i, PauseAt)]
|
|
#self.actions = [i for i in self.actions if not isinstance(i, PauseAt)]
|
|
return pauses
|
|
|
|
def maximum_length(self, settings, request_host):
|
|
"""
|
|
Calculate the maximum length of the base message with all applied actions.
|
|
"""
|
|
l = self.length(settings, request_host)
|
|
for i in self.actions:
|
|
if isinstance(i, InjectAt):
|
|
l += len(i.value.get_generator(settings))
|
|
return l
|
|
|
|
def headervals(self, settings, request_host):
|
|
hdrs = self.headers[:]
|
|
if not self.raw:
|
|
if self.body and not utils.get_header("Content-Length", self.headers):
|
|
hdrs.append(
|
|
Header(
|
|
ValueLiteral("Content-Length"),
|
|
ValueLiteral(str(len(self.body.value.get_generator(settings)))),
|
|
)
|
|
)
|
|
if request_host:
|
|
if not utils.get_header("Host", self.headers):
|
|
hdrs.append(
|
|
Header(
|
|
ValueLiteral("Host"),
|
|
ValueLiteral(request_host)
|
|
)
|
|
)
|
|
|
|
else:
|
|
if not utils.get_header("Date", self.headers):
|
|
hdrs.append(
|
|
Header(
|
|
ValueLiteral("Date"),
|
|
ValueLiteral(formatdate(timeval=None, localtime=False, usegmt=True))
|
|
)
|
|
)
|
|
values = []
|
|
for h in hdrs:
|
|
values.extend(h.values(settings))
|
|
return values
|
|
|
|
def ready_actions(self, settings, request_host):
|
|
actions = [i.resolve_offset(self, settings, request_host) for i in self.actions]
|
|
actions.sort()
|
|
actions.reverse()
|
|
return [i.intermediate(settings) for i in actions]
|
|
|
|
def serve(self, fp, settings, request_host):
|
|
"""
|
|
fp: The file pointer to write to.
|
|
|
|
request_host: If this a request, this is the connecting host. If
|
|
None, we assume it's a response. Used to decide what standard
|
|
modifications to make if raw is not set.
|
|
|
|
Calling this function may modify the object.
|
|
"""
|
|
started = time.time()
|
|
|
|
hdrs = self.headervals(settings, request_host)
|
|
|
|
vals = self.preamble(settings)
|
|
vals.append("\r\n")
|
|
vals.extend(hdrs)
|
|
vals.append("\r\n")
|
|
if self.body:
|
|
vals.append(self.body.value.get_generator(settings))
|
|
vals.reverse()
|
|
actions = self.ready_actions(settings, request_host)
|
|
|
|
disconnect = write_values(fp, vals, actions[:])
|
|
duration = time.time() - started
|
|
ret = dict(
|
|
disconnect = disconnect,
|
|
started = started,
|
|
duration = duration,
|
|
)
|
|
for i in self.logattrs:
|
|
v = getattr(self, i)
|
|
# Careful not to log any VALUE specs without sanitizing them first. We truncate at 1k.
|
|
if hasattr(v, "values"):
|
|
v = [x[:TRUNCATE] for x in v.values(settings)]
|
|
v = "".join(v).encode("string_escape")
|
|
elif hasattr(v, "__len__"):
|
|
v = v[:TRUNCATE]
|
|
v = v.encode("string_escape")
|
|
ret[i] = v
|
|
return ret
|
|
|
|
@abc.abstractmethod
|
|
def preamble(self, settings): # pragma: no cover
|
|
pass
|
|
|
|
@abc.abstractmethod
|
|
def expr(klass): # pragma: no cover
|
|
pass
|
|
|
|
|
|
Sep = pp.Optional(pp.Literal(":")).suppress()
|
|
|
|
class _Response(_Message):
|
|
comps = (
|
|
Body,
|
|
Header,
|
|
PauseAt,
|
|
DisconnectAt,
|
|
InjectAt,
|
|
ShortcutContentType,
|
|
ShortcutLocation,
|
|
Raw,
|
|
Reason
|
|
)
|
|
logattrs = ["code", "reason", "version", "body"]
|
|
@property
|
|
def code(self):
|
|
return self._get_token(Code)
|
|
|
|
@property
|
|
def reason(self):
|
|
return self._get_token(Reason)
|
|
|
|
def preamble(self, settings):
|
|
l = [self.version, " "]
|
|
l.extend(self.code.values(settings))
|
|
l.append(" ")
|
|
if self.reason:
|
|
l.extend(self.reason.values(settings))
|
|
else:
|
|
l.append(LiteralGenerator(http_status.RESPONSES.get(int(self.code.code), "Unknown code")))
|
|
return l
|
|
|
|
@classmethod
|
|
def expr(klass):
|
|
parts = [i.expr() for i in klass.comps]
|
|
atom = pp.MatchFirst(parts)
|
|
resp = pp.And(
|
|
[
|
|
Code.expr(),
|
|
pp.ZeroOrMore(Sep + atom)
|
|
]
|
|
)
|
|
return resp
|
|
|
|
|
|
class _Request(_Message):
|
|
comps = (
|
|
Body,
|
|
Header,
|
|
PauseAt,
|
|
DisconnectAt,
|
|
InjectAt,
|
|
ShortcutContentType,
|
|
Raw
|
|
)
|
|
logattrs = ["method", "path", "body"]
|
|
@property
|
|
def method(self):
|
|
return self._get_token(Method)
|
|
|
|
@property
|
|
def path(self):
|
|
return self._get_token(Path)
|
|
|
|
def preamble(self, settings):
|
|
v = self.method.values(settings)
|
|
v.append(" ")
|
|
v.extend(self.path.values(settings))
|
|
v.append(" ")
|
|
v.append(self.version)
|
|
return v
|
|
|
|
@classmethod
|
|
def expr(klass):
|
|
parts = [i.expr() for i in klass.comps]
|
|
atom = pp.MatchFirst(parts)
|
|
resp = pp.And(
|
|
[
|
|
Method.expr(),
|
|
Sep,
|
|
Path.expr(),
|
|
pp.ZeroOrMore(Sep + atom)
|
|
]
|
|
)
|
|
return resp
|
|
|
|
|
|
class CraftedRequest(_Request):
|
|
def __init__(self, spec, tokens):
|
|
_Request.__init__(self, tokens)
|
|
self.spec, self.tokens = spec, tokens
|
|
|
|
def serve(self, fp, settings, host):
|
|
d = _Request.serve(self, fp, settings, host)
|
|
d["spec"] = self.spec
|
|
return d
|
|
|
|
|
|
class CraftedResponse(_Response):
|
|
def __init__(self, spec, tokens):
|
|
_Response.__init__(self, tokens)
|
|
self.spec, self.tokens = spec, tokens
|
|
|
|
def serve(self, fp, settings):
|
|
d = _Response.serve(self, fp, settings, None)
|
|
d["spec"] = self.spec
|
|
return d
|
|
|
|
|
|
class PathodErrorResponse(_Response):
|
|
def __init__(self, reason, body=None):
|
|
tokens = [
|
|
Code("800"),
|
|
Header(ValueLiteral("Content-Type"), ValueLiteral("text/plain")),
|
|
Reason(ValueLiteral(reason)),
|
|
Body(ValueLiteral("pathod error: " + (body or reason))),
|
|
]
|
|
_Response.__init__(self, tokens)
|
|
|
|
def serve(self, fp, settings):
|
|
d = _Response.serve(self, fp, settings, None)
|
|
d["internal"] = True
|
|
return d
|
|
|
|
|
|
FILESTART = "+"
|
|
def read_file(settings, s):
|
|
uf = settings.get("unconstrained_file_access")
|
|
sd = settings.get("staticdir")
|
|
if not sd:
|
|
raise FileAccessDenied("File access disabled.")
|
|
sd = os.path.normpath(os.path.abspath(sd))
|
|
s = s[1:]
|
|
s = os.path.expanduser(s)
|
|
s = os.path.normpath(os.path.abspath(os.path.join(sd, s)))
|
|
if not uf and not s.startswith(sd):
|
|
raise FileAccessDenied("File access outside of configured directory")
|
|
if not os.path.isfile(s):
|
|
raise FileAccessDenied("File not readable")
|
|
return file(s, "r").read()
|
|
|
|
|
|
def parse_response(settings, s):
|
|
"""
|
|
May raise ParseException or FileAccessDenied
|
|
"""
|
|
try:
|
|
s.decode("ascii")
|
|
except UnicodeError:
|
|
raise ParseException("Spec must be valid ASCII.", 0, 0)
|
|
if s.startswith(FILESTART):
|
|
s = read_file(settings, s)
|
|
try:
|
|
return CraftedResponse(s, _Response.expr().parseString(s, parseAll=True))
|
|
except pp.ParseException, v:
|
|
raise ParseException(v.msg, v.line, v.col)
|
|
|
|
|
|
def parse_request(settings, s):
|
|
"""
|
|
May raise ParseException or FileAccessDenied
|
|
"""
|
|
try:
|
|
s.decode("ascii")
|
|
except UnicodeError:
|
|
raise ParseException("Spec must be valid ASCII.", 0, 0)
|
|
if s.startswith(FILESTART):
|
|
s = read_file(settings, s)
|
|
try:
|
|
return CraftedRequest(s, _Request.expr().parseString(s, parseAll=True))
|
|
except pp.ParseException, v:
|
|
raise ParseException(v.msg, v.line, v.col)
|