from __future__ import absolute_import
"""
M2Crypto wrapper for OpenSSL ASN1 API.
Copyright (c) 1999-2004 Ng Pheng Siong. All rights reserved.
Portions created by Open Source Applications Foundation (OSAF) are
Copyright (C) 2005 OSAF. All Rights Reserved.
"""
import datetime
import time
from M2Crypto import BIO, m2
from typing import Optional # noqa
MBSTRING_FLAG = 0x1000
MBSTRING_ASC = MBSTRING_FLAG | 1
MBSTRING_BMP = MBSTRING_FLAG | 2
[docs]
class ASN1_Integer(object):
m2_asn1_integer_free = m2.asn1_integer_free
def __init__(self, asn1int, _pyfree=0):
# type: (ASN1_Integer, int) -> None
self.asn1int = asn1int
self._pyfree = _pyfree
def __cmp__(self, other):
# type: (ASN1_Integer) -> int
if not isinstance(other, ASN1_Integer):
raise TypeError(
"Comparisons supported only between ANS1_Integer objects")
return m2.asn1_integer_cmp(self.asn1int, other.asn1int)
def __del__(self):
# type: () -> None
if self._pyfree:
self.m2_asn1_integer_free(self.asn1int)
def __int__(self):
# type: () -> int
return m2.asn1_integer_get(self.asn1int)
[docs]
class ASN1_String(object):
m2_asn1_string_free = m2.asn1_string_free
def __init__(self, asn1str, _pyfree=0):
# type: (ASN1_String, int) -> None
self.asn1str = asn1str
self._pyfree = _pyfree
def __bytes__(self):
# type: () -> bytes
buf = BIO.MemoryBuffer()
m2.asn1_string_print(buf.bio_ptr(), self.asn1str)
return buf.read_all()
def __str__(self):
# type: () -> str
return self.__bytes__().decode()
def __del__(self):
# type: () -> None
if getattr(self, '_pyfree', 0):
self.m2_asn1_string_free(self.asn1str)
def _ptr(self):
return self.asn1str
[docs]
def as_text(self, flags=0):
# type: (int) -> str
"""Output an ASN1_STRING structure according to the set flags.
:param flags: determine the format of the output by using
predetermined constants, see ASN1_STRING_print_ex(3)
manpage for their meaning.
:return: output an ASN1_STRING structure.
"""
buf = BIO.MemoryBuffer()
m2.asn1_string_print_ex(buf.bio_ptr(), self.asn1str, flags)
return buf.read_all().decode()
[docs]
class ASN1_Object(object):
m2_asn1_object_free = m2.asn1_object_free
def __init__(self, asn1obj, _pyfree=0):
# type: (ASN1_Object, int) -> None
self.asn1obj = asn1obj
self._pyfree = _pyfree
def __del__(self):
# type: () -> None
if self._pyfree:
self.m2_asn1_object_free(self.asn1obj)
def _ptr(self):
return self.asn1obj
class _UTC(datetime.tzinfo):
def tzname(self, dt):
# type: (Optional[datetime.datetime]) -> str
return "UTC"
def dst(self, dt):
# type: (Optional[datetime.datetime]) -> datetime.timedelta
return datetime.timedelta(0)
def utcoffset(self, dt):
# type: (Optional[datetime.datetime]) -> datetime.timedelta
return datetime.timedelta(0)
def __repr__(self):
return "<Timezone: %s>" % self.tzname(None)
UTC = _UTC() # type: _UTC
[docs]
class LocalTimezone(datetime.tzinfo):
"""Localtimezone from datetime manual."""
def __init__(self):
# type: () -> None
self._stdoffset = datetime.timedelta(seconds=-time.timezone)
if time.daylight:
self._dstoffset = datetime.timedelta(seconds=-time.altzone)
else:
self._dstoffset = self._stdoffset
self._dstdiff = self._dstoffset - self._stdoffset
[docs]
def utcoffset(self, dt):
# type: (datetime.datetime) -> datetime.timedelta
if self._isdst(dt):
return self._dstoffset
else:
return self._stdoffset
[docs]
def dst(self, dt):
# type: (datetime.datetime) -> datetime.timedelta
if self._isdst(dt):
return self._dstdiff
else:
return datetime.timedelta(0)
[docs]
def tzname(self, dt):
# type: (datetime.datetime) -> str
return time.tzname[self._isdst(dt).real]
def _isdst(self, dt):
# type: (datetime.datetime) -> bool
tt = (dt.year, dt.month, dt.day,
dt.hour, dt.minute, dt.second,
dt.weekday(), 0, -1)
stamp = time.mktime(tt)
tt = time.localtime(stamp)
return tt.tm_isdst > 0
[docs]
class ASN1_TIME(object):
_ssl_months = ["Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug",
"Sep", "Oct", "Nov", "Dec"]
m2_asn1_time_free = m2.asn1_time_free
def __init__(self, asn1_time=None, _pyfree=0, asn1_utctime=None):
# type: (Optional[ASN1_TIME], Optional[int], Optional[ASN1_TIME]) -> None
# handle old keyword parameter
if asn1_time is None:
asn1_time = asn1_utctime
if asn1_time is not None:
assert m2.asn1_time_type_check(asn1_time), \
"'asn1_time' type error'"
self.asn1_time = asn1_time
self._pyfree = _pyfree
else:
# that's (ASN1_TIME*)
self.asn1_time = m2.asn1_time_new() # type: bytes
self._pyfree = 1
def __del__(self):
# type: () -> None
if getattr(self, '_pyfree', 0):
self.m2_asn1_time_free(self.asn1_time)
def __str__(self):
# type: () -> str
assert m2.asn1_time_type_check(self.asn1_time), \
"'asn1_time' type error'"
buf = BIO.MemoryBuffer()
m2.asn1_time_print(buf.bio_ptr(), self.asn1_time)
return buf.read_all().decode()
def _ptr(self):
assert m2.asn1_time_type_check(self.asn1_time), \
"'asn1_time' type error'"
return self.asn1_time
[docs]
def set_string(self, string):
# type: (bytes) -> int
"""
Set time from UTC string.
:return: 1 if the time value is successfully set and 0
otherwise
"""
assert m2.asn1_time_type_check(self.asn1_time), \
"'asn1_time' type error'"
return m2.asn1_time_set_string(self.asn1_time, string)
[docs]
def set_time(self, time):
# type: (int) -> ASN1_TIME
"""
Set time from seconds since epoch (int).
:return: pointer to a time structure or NULL if an error
occurred
"""
assert m2.asn1_time_type_check(self.asn1_time), \
"'asn1_time' type error'"
if hasattr(__builtins__, "long"):
time = long(time)
return m2.asn1_time_set(self.asn1_time, time)
[docs]
def get_datetime(self):
# type: () -> datetime.datetime
"""
Get time as datetime.datetime object
:return: always return datetime object
:raises: ValueError if anything wrong happens
"""
date = str(self)
timezone = None
if ' ' not in date:
raise ValueError("Invalid date: %s" % date)
month, rest = date.split(' ', 1)
if month not in self._ssl_months:
raise ValueError("Invalid date %s: Invalid month: %s" %
(date, month))
if rest.endswith(' GMT'):
timezone = UTC
rest = rest[:-4]
if '.' in rest:
dt = datetime.datetime.strptime(rest, "%d %H:%M:%S.%f %Y")
else:
dt = datetime.datetime.strptime(rest, "%d %H:%M:%S %Y")
dt = dt.replace(month=self._ssl_months.index(month) + 1)
if timezone:
dt = dt.replace(tzinfo=UTC)
return dt
[docs]
def set_datetime(self, date):
# type: (datetime.datetime) -> ASN1_TIME
"""
Set time from datetime.datetime object.
:return: pointer to a time structure or NULL if an error
occurred
"""
local = LocalTimezone()
if date.tzinfo is None:
date = date.replace(tzinfo=local)
date = date.astimezone(local)
return self.set_time(int(time.mktime(date.timetuple())))
ASN1_UTCTIME = ASN1_TIME