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from __future__ import absolute_import
"""M2Crypto wrapper for OpenSSL S/MIME API.
Copyright (c) 1999-2003 Ng Pheng Siong. All rights reserved."""
from M2Crypto import BIO, EVP, Err, X509, m2, util
from typing import AnyStr, Callable, Optional # noqa
PKCS7_TEXT = m2.PKCS7_TEXT # type: int
PKCS7_NOCERTS = m2.PKCS7_NOCERTS # type: int
PKCS7_NOSIGS = m2.PKCS7_NOSIGS # type: int
PKCS7_NOCHAIN = m2.PKCS7_NOCHAIN # type: int
PKCS7_NOINTERN = m2.PKCS7_NOINTERN # type: int
PKCS7_NOVERIFY = m2.PKCS7_NOVERIFY # type: int
PKCS7_DETACHED = m2.PKCS7_DETACHED # type: int
PKCS7_BINARY = m2.PKCS7_BINARY # type: int
PKCS7_NOATTR = m2.PKCS7_NOATTR # type: int
PKCS7_SIGNED = m2.PKCS7_SIGNED # type: int
PKCS7_ENVELOPED = m2.PKCS7_ENVELOPED # type: int
PKCS7_SIGNED_ENVELOPED = m2.PKCS7_SIGNED_ENVELOPED # Deprecated
PKCS7_DATA = m2.PKCS7_DATA # type: int
class PKCS7_Error(Exception):
pass
m2.pkcs7_init(PKCS7_Error)
class PKCS7(object):
m2_pkcs7_free = m2.pkcs7_free
def __init__(self, pkcs7=None, _pyfree=0):
# type: (Optional[bytes], int) -> None
"""PKCS7 object.
:param pkcs7: binary representation of
the OpenSSL type PKCS7
"""
if pkcs7 is not None:
self.pkcs7 = pkcs7
self._pyfree = _pyfree
else:
self.pkcs7 = m2.pkcs7_new()
self._pyfree = 1
def __del__(self):
# type: () -> None
if getattr(self, '_pyfree', 0):
self.m2_pkcs7_free(self.pkcs7)
def _ptr(self):
return self.pkcs7
def type(self, text_name=0):
# type: (int) -> int
if text_name:
return m2.pkcs7_type_sn(self.pkcs7)
else:
return m2.pkcs7_type_nid(self.pkcs7)
def write(self, bio):
# type: (BIO.BIO) -> int
return m2.pkcs7_write_bio(self.pkcs7, bio._ptr())
def write_der(self, bio):
# type: (BIO.BIO) -> int
return m2.pkcs7_write_bio_der(self.pkcs7, bio._ptr())
def get0_signers(self, certs, flags=0):
# type: (X509.X509_Stack, int) -> X509.X509_Stack
return X509.X509_Stack(m2.pkcs7_get0_signers(self.pkcs7,
certs.stack, flags), 1)
def load_pkcs7(p7file):
# type: (AnyStr) -> PKCS7
with BIO.openfile(p7file, 'r') as bio:
p7_ptr = m2.pkcs7_read_bio(bio.bio)
return PKCS7(p7_ptr, 1)
def load_pkcs7_der(p7file):
# type: (AnyStr) -> PKCS7
with BIO.openfile(p7file, 'rb') as bio:
p7_ptr = m2.pkcs7_read_bio_der(bio.bio)
return PKCS7(p7_ptr, 1)
def load_pkcs7_bio(p7_bio):
# type: (BIO.BIO) -> PKCS7
p7_ptr = m2.pkcs7_read_bio(p7_bio._ptr())
return PKCS7(p7_ptr, 1)
def load_pkcs7_bio_der(p7_bio):
# type: (BIO.BIO) -> PKCS7
p7_ptr = m2.pkcs7_read_bio_der(p7_bio._ptr())
return PKCS7(p7_ptr, 1)
def smime_load_pkcs7(p7file):
# type: (AnyStr) -> PKCS7
bio = m2.bio_new_file(p7file, 'r')
try:
p7_ptr, bio_ptr = m2.smime_read_pkcs7(bio)
finally:
m2.bio_free(bio)
if bio_ptr is None:
return PKCS7(p7_ptr, 1), None
else:
return PKCS7(p7_ptr, 1), BIO.BIO(bio_ptr, 1)
def smime_load_pkcs7_bio(p7_bio):
# type: (BIO.BIO) -> PKCS7
p7_ptr, bio_ptr = m2.smime_read_pkcs7(p7_bio._ptr())
if p7_ptr is None:
raise SMIME_Error(Err.get_error())
if bio_ptr is None:
return PKCS7(p7_ptr, 1), None
else:
return PKCS7(p7_ptr, 1), BIO.BIO(bio_ptr, 1)
class Cipher(object):
"""Object interface to EVP_CIPHER without all the frills of
M2Crypto.EVP.Cipher.
"""
def __init__(self, algo):
# type: (str) -> None
cipher = getattr(m2, algo, None)
if cipher is None:
raise ValueError('unknown cipher', algo)
self.cipher = cipher()
def _ptr(self):
return self.cipher
class SMIME_Error(Exception):
pass
m2.smime_init(SMIME_Error)
# FIXME class has no __init__ method
class SMIME(object):
def load_key(self, keyfile, certfile=None,
callback=util.passphrase_callback):
# type: (AnyStr, Optional[AnyStr], Callable) -> None
if certfile is None:
certfile = keyfile
self.pkey = EVP.load_key(keyfile, callback)
self.x509 = X509.load_cert(certfile)
def load_key_bio(self, keybio, certbio=None,
callback=util.passphrase_callback):
# type: (BIO.BIO, Optional[BIO.BIO], Callable) -> None
if certbio is None:
certbio = keybio
self.pkey = EVP.load_key_bio(keybio, callback)
self.x509 = X509.load_cert_bio(certbio)
def set_x509_stack(self, stack):
# type: (X509.X509_Stack) -> None
assert isinstance(stack, X509.X509_Stack)
self.x509_stack = stack
def set_x509_store(self, store):
# type: (X509.X509_Store) -> None
assert isinstance(store, X509.X509_Store)
self.x509_store = store
def set_cipher(self, cipher):
# type: (Cipher) -> None
assert isinstance(cipher, Cipher)
self.cipher = cipher
def unset_key(self):
# type: () -> None
del self.pkey
del self.x509
def unset_x509_stack(self):
# type: () -> None
del self.x509_stack
def unset_x509_store(self):
# type: () -> None
del self.x509_store
def unset_cipher(self):
# type: () -> None
del self.cipher
def encrypt(self, data_bio, flags=0):
# type: (BIO.BIO, int) -> PKCS7
if not hasattr(self, 'cipher'):
raise SMIME_Error('no cipher: use set_cipher()')
if not hasattr(self, 'x509_stack'):
raise SMIME_Error('no recipient certs: use set_x509_stack()')
pkcs7 = m2.pkcs7_encrypt(self.x509_stack._ptr(), data_bio._ptr(),
self.cipher._ptr(), flags)
return PKCS7(pkcs7, 1)
def decrypt(self, pkcs7, flags=0):
# type: (PKCS7, int) -> Optional[bytes]
if not hasattr(self, 'pkey'):
raise SMIME_Error('no private key: use load_key()')
if not hasattr(self, 'x509'):
raise SMIME_Error('no certificate: load_key() used incorrectly?')
blob = m2.pkcs7_decrypt(pkcs7._ptr(), self.pkey._ptr(),
self.x509._ptr(), flags)
return blob
def sign(self, data_bio, flags=0, algo='sha1'):
# type: (BIO.BIO, int, Optional[str]) -> PKCS7
if not hasattr(self, 'pkey'):
raise SMIME_Error('no private key: use load_key()')
hash = getattr(m2, algo, None)
if hash is None:
raise SMIME_Error('no such hash algorithm %s' % algo)
if hasattr(self, 'x509_stack'):
pkcs7 = m2.pkcs7_sign1(self.x509._ptr(), self.pkey._ptr(),
self.x509_stack._ptr(),
data_bio._ptr(), hash(), flags)
return PKCS7(pkcs7, 1)
else:
pkcs7 = m2.pkcs7_sign0(self.x509._ptr(), self.pkey._ptr(),
data_bio._ptr(), hash(), flags)
return PKCS7(pkcs7, 1)
def verify(self, pkcs7, data_bio=None, flags=0):
# type: (PKCS7, BIO.BIO, int) -> Optional[bytes]
if not hasattr(self, 'x509_stack'):
raise SMIME_Error('no signer certs: use set_x509_stack()')
if not hasattr(self, 'x509_store'):
raise SMIME_Error('no x509 cert store: use set_x509_store()')
assert isinstance(pkcs7, PKCS7), 'pkcs7 not an instance of PKCS7'
p7 = pkcs7._ptr()
if data_bio is None:
blob = m2.pkcs7_verify0(p7, self.x509_stack._ptr(),
self.x509_store._ptr(), flags)
else:
blob = m2.pkcs7_verify1(p7, self.x509_stack._ptr(),
self.x509_store._ptr(),
data_bio._ptr(), flags)
return blob
def write(self, out_bio, pkcs7, data_bio=None, flags=0):
# type: (BIO.BIO, PKCS7, Optional[BIO.BIO], int) -> int
assert isinstance(pkcs7, PKCS7)
if data_bio is None:
return m2.smime_write_pkcs7(out_bio._ptr(), pkcs7._ptr(), flags)
else:
return m2.smime_write_pkcs7_multi(out_bio._ptr(), pkcs7._ptr(),
data_bio._ptr(), flags)
def text_crlf(text):
# type: (bytes) -> bytes
bio_in = BIO.MemoryBuffer(text)
bio_out = BIO.MemoryBuffer()
if m2.smime_crlf_copy(bio_in._ptr(), bio_out._ptr()):
return bio_out.read()
else:
raise SMIME_Error(Err.get_error())
def text_crlf_bio(bio_in):
# type: (BIO.BIO) -> BIO.BIO
bio_out = BIO.MemoryBuffer()
if m2.smime_crlf_copy(bio_in._ptr(), bio_out._ptr()):
return bio_out
else:
raise SMIME_Error(Err.get_error())
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