1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
|
# This file is dual licensed under the terms of the Apache License, Version
# 2.0, and the BSD License. See the LICENSE file in the root of this repository
# for complete details.
from __future__ import absolute_import, division, print_function
import sys
import cffi
INCLUDES = """
#include <openssl/ssl.h>
#include <openssl/x509.h>
#include <openssl/x509_vfy.h>
#include <openssl/crypto.h>
#include <pythread.h>
"""
TYPES = """
static const long Cryptography_STATIC_CALLBACKS;
/* crypto.h
* CRYPTO_set_locking_callback
* void (*cb)(int mode, int type, const char *file, int line)
*/
extern "Python" void Cryptography_locking_cb(int, int, const char *, int);
/* pem.h
* int pem_password_cb(char *buf, int size, int rwflag, void *userdata);
*/
extern "Python" int Cryptography_pem_password_cb(char *, int, int, void *);
/* rand.h
* int (*bytes)(unsigned char *buf, int num);
* int (*status)(void);
*/
extern "Python" int Cryptography_rand_bytes(unsigned char *, int);
extern "Python" int Cryptography_rand_status(void);
"""
FUNCTIONS = """
int _setup_ssl_threads(void);
"""
MACROS = """
"""
CUSTOMIZATIONS = """
static const long Cryptography_STATIC_CALLBACKS = 1;
"""
if cffi.__version_info__ < (1, 4, 0) or sys.version_info >= (3, 5):
# backwards compatibility for old cffi version on PyPy
# and Python >=3.5 (https://github.com/pyca/cryptography/issues/2970)
TYPES = "static const long Cryptography_STATIC_CALLBACKS;"
CUSTOMIZATIONS = """static const long Cryptography_STATIC_CALLBACKS = 0;
"""
CUSTOMIZATIONS += """
/* This code is derived from the locking code found in the Python _ssl module's
locking callback for OpenSSL.
Copyright 2001-2016 Python Software Foundation; All Rights Reserved.
*/
static unsigned int _ssl_locks_count = 0;
static PyThread_type_lock *_ssl_locks = NULL;
static void _ssl_thread_locking_function(int mode, int n, const char *file,
int line) {
/* this function is needed to perform locking on shared data
structures. (Note that OpenSSL uses a number of global data
structures that will be implicitly shared whenever multiple
threads use OpenSSL.) Multi-threaded applications will
crash at random if it is not set.
locking_function() must be able to handle up to
CRYPTO_num_locks() different mutex locks. It sets the n-th
lock if mode & CRYPTO_LOCK, and releases it otherwise.
file and line are the file number of the function setting the
lock. They can be useful for debugging.
*/
if ((_ssl_locks == NULL) ||
(n < 0) || ((unsigned)n >= _ssl_locks_count)) {
return;
}
if (mode & CRYPTO_LOCK) {
PyThread_acquire_lock(_ssl_locks[n], 1);
} else {
PyThread_release_lock(_ssl_locks[n]);
}
}
int _setup_ssl_threads(void) {
unsigned int i;
if (_ssl_locks == NULL) {
_ssl_locks_count = CRYPTO_num_locks();
_ssl_locks = PyMem_New(PyThread_type_lock, _ssl_locks_count);
if (_ssl_locks == NULL) {
PyErr_NoMemory();
return 0;
}
memset(_ssl_locks, 0, sizeof(PyThread_type_lock) * _ssl_locks_count);
for (i = 0; i < _ssl_locks_count; i++) {
_ssl_locks[i] = PyThread_allocate_lock();
if (_ssl_locks[i] == NULL) {
unsigned int j;
for (j = 0; j < i; j++) {
PyThread_free_lock(_ssl_locks[j]);
}
PyMem_Free(_ssl_locks);
return 0;
}
}
CRYPTO_set_locking_callback(_ssl_thread_locking_function);
}
return 1;
}
"""
|
