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"""M2Crypto wrapper for OpenSSL BIO API.
Copyright (c) 1999-2004 Ng Pheng Siong. All rights reserved."""
import m2
# Deprecated
from m2 import bio_do_handshake as bio_do_ssl_handshake
from cStringIO import StringIO
class BIOError(Exception): pass
m2.bio_init(BIOError)
class BIO:
"""Abstract object interface to the BIO API."""
m2_bio_free = m2.bio_free
def __init__(self, bio=None, _pyfree=0, _close_cb=None):
self.bio = bio
self._pyfree = _pyfree
self._close_cb = _close_cb
self.closed = 0
self.write_closed = 0
def __del__(self):
if self._pyfree:
self.m2_bio_free(self.bio)
def _ptr(self):
return self.bio
# Deprecated.
bio_ptr = _ptr
def fileno(self):
return m2.bio_get_fd(self.bio)
def readable(self):
return not self.closed
def read(self, size=None):
if not self.readable():
raise IOError, 'cannot read'
if size is None:
buf = StringIO()
while 1:
data = m2.bio_read(self.bio, 4096)
if not data: break
buf.write(data)
return buf.getvalue()
elif size == 0:
return ''
elif size < 0:
raise ValueError, 'read count is negative'
else:
return m2.bio_read(self.bio, size)
def readline(self, size=4096):
if not self.readable():
raise IOError, 'cannot read'
buf = m2.bio_gets(self.bio, size)
return buf
def readlines(self, sizehint='ignored'):
if not self.readable():
raise IOError, 'cannot read'
lines=[]
while 1:
buf=m2.bio_gets(self.bio, 4096)
if buf is None:
break
lines.append(buf)
return lines
def writeable(self):
return (not self.closed) and (not self.write_closed)
def write(self, data):
if not self.writeable():
raise IOError, 'cannot write'
return m2.bio_write(self.bio, data)
def write_close(self):
self.write_closed = 1
def flush(self):
m2.bio_flush(self.bio)
def reset(self):
"""
Sets the bio to its initial state
"""
return m2.bio_reset(self.bio)
def close(self):
self.closed = 1
if self._close_cb:
self._close_cb()
def should_retry(self):
"""
Can the call be attempted again, or was there an error
ie do_handshake
"""
return m2.bio_should_retry(self.bio)
def should_read(self):
"""
Returns whether the cause of the condition is the bio
should read more data
"""
return m2.bio_should_read(self.bio)
def should_write(self):
"""
Returns whether the cause of the condition is the bio
should write more data
"""
return m2.bio_should_write(self.bio)
class MemoryBuffer(BIO):
"""
Object interface to BIO_s_mem.
Empirical testing suggests that this class performs less well than cStringIO,
because cStringIO is implemented in C, whereas this class is implemented in
Python. Thus, the recommended practice is to use cStringIO for regular work and
convert said cStringIO object to a MemoryBuffer object only when necessary.
"""
def __init__(self, data=None):
BIO.__init__(self)
self.bio = m2.bio_new(m2.bio_s_mem())
self._pyfree = 1
if data is not None:
m2.bio_write(self.bio, data)
def __len__(self):
return m2.bio_ctrl_pending(self.bio)
def read(self, size=0):
if not self.readable():
raise IOError, 'cannot read'
if size:
return m2.bio_read(self.bio, size)
else:
return m2.bio_read(self.bio, m2.bio_ctrl_pending(self.bio))
# Backwards-compatibility.
getvalue = read_all = read
def write_close(self):
self.write_closed = 1
m2.bio_set_mem_eof_return(self.bio, 0)
close = write_close
class File(BIO):
"""
Object interface to BIO_s_fp.
This class interfaces Python to OpenSSL functions that expect BIO *. For
general file manipulation in Python, use Python's builtin file object.
"""
def __init__(self, pyfile, close_pyfile=1):
BIO.__init__(self, _pyfree=1)
self.pyfile = pyfile
self.close_pyfile = close_pyfile
self.bio = m2.bio_new_fp(pyfile, 0)
def close(self):
self.closed = 1
if self.close_pyfile:
self.pyfile.close()
def openfile(filename, mode='rb'):
return File(open(filename, mode))
class IOBuffer(BIO):
"""
Object interface to BIO_f_buffer.
Its principal function is to be BIO_push()'ed on top of a BIO_f_ssl, so
that makefile() of said underlying SSL socket works.
"""
m2_bio_pop = m2.bio_pop
m2_bio_free = m2.bio_free
def __init__(self, under_bio, mode='rwb', _pyfree=1):
BIO.__init__(self, _pyfree=_pyfree)
self.io = m2.bio_new(m2.bio_f_buffer())
self.bio = m2.bio_push(self.io, under_bio._ptr())
# This reference keeps the underlying BIO alive while we're not closed.
self._under_bio = under_bio
if 'w' in mode:
self.write_closed = 0
else:
self.write_closed = 1
def __del__(self):
if getattr(self, '_pyfree', 0):
self.m2_bio_pop(self.bio)
self.m2_bio_free(self.io)
def close(self):
BIO.close(self)
class CipherStream(BIO):
"""
Object interface to BIO_f_cipher.
"""
SALT_LEN = m2.PKCS5_SALT_LEN
m2_bio_pop = m2.bio_pop
m2_bio_free = m2.bio_free
def __init__(self, obio):
BIO.__init__(self, _pyfree=1)
self.obio = obio
self.bio = m2.bio_new(m2.bio_f_cipher())
self.closed = 0
def __del__(self):
if not getattr(self, 'closed', 1):
self.close()
def close(self):
self.m2_bio_pop(self.bio)
self.m2_bio_free(self.bio)
self.closed = 1
def write_close(self):
self.obio.write_close()
def set_cipher(self, algo, key, iv, op):
cipher = getattr(m2, algo, None)
if cipher is None:
raise ValueError, ('unknown cipher', algo)
m2.bio_set_cipher(self.bio, cipher(), key, iv, op)
m2.bio_push(self.bio, self.obio._ptr())
class SSLBio(BIO):
"""
Object interface to BIO_f_ssl
"""
def __init__(self, _pyfree=1):
BIO.__init__(self, _pyfree)
self.bio = m2.bio_new(m2.bio_f_ssl())
self.closed = 0
def set_ssl(self, conn, close_flag=m2.bio_noclose):
"""
Sets the bio to the SSL pointer which is
contained in the connection object.
"""
self._pyfree = 0
m2.bio_set_ssl(self.bio, conn.ssl, close_flag)
if close_flag == m2.bio_noclose:
conn.set_ssl_close_flag(m2.bio_close)
def do_handshake(self):
"""
Do the handshake.
Return 1 if the handshake completes
Return 0 or a negative number if there is a problem
"""
return m2.bio_do_handshake(self.bio)