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# 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
INCLUDES = """
#include <openssl/ssl.h>
#include <openssl/x509.h>
#include <openssl/x509_vfy.h>
#include <openssl/crypto.h>
#include <pythread.h>
"""
TYPES = """
typedef struct {
char *password;
int length;
int called;
int error;
int maxsize;
} CRYPTOGRAPHY_PASSWORD_DATA;
"""
FUNCTIONS = """
int _setup_ssl_threads(void);
int Cryptography_pem_password_cb(char *, int, int, void *);
"""
MACROS = """
"""
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;
}
typedef struct {
char *password;
int length;
int called;
int error;
int maxsize;
} CRYPTOGRAPHY_PASSWORD_DATA;
int Cryptography_pem_password_cb(char *buf, int size,
int rwflag, void *userdata) {
/* The password cb is only invoked if OpenSSL decides the private
key is encrypted. So this path only occurs if it needs a password */
CRYPTOGRAPHY_PASSWORD_DATA *st = (CRYPTOGRAPHY_PASSWORD_DATA *)userdata;
st->called += 1;
st->maxsize = size;
if (st->length == 0) {
st->error = -1;
return 0;
} else if (st->length < size) {
memcpy(buf, st->password, st->length);
return st->length;
} else {
st->error = -2;
return 0;
}
}
"""
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