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import OpenSSL
import OpenSSL._util as pyOpenSSLutil
from scrapy.utils.python import to_unicode
# The OpenSSL symbol is present since 1.1.1 but it's not currently supported in any version of pyOpenSSL.
# Using the binding directly, as this code does, requires cryptography 2.4.
SSL_OP_NO_TLSv1_3 = getattr(pyOpenSSLutil.lib, 'SSL_OP_NO_TLSv1_3', 0)
def ffi_buf_to_string(buf):
return to_unicode(pyOpenSSLutil.ffi.string(buf))
def x509name_to_string(x509name):
# from OpenSSL.crypto.X509Name.__repr__
result_buffer = pyOpenSSLutil.ffi.new("char[]", 512)
pyOpenSSLutil.lib.X509_NAME_oneline(x509name._name, result_buffer, len(result_buffer))
return ffi_buf_to_string(result_buffer)
def get_temp_key_info(ssl_object):
if not hasattr(pyOpenSSLutil.lib, 'SSL_get_server_tmp_key'): # requires OpenSSL 1.0.2
return None
# adapted from OpenSSL apps/s_cb.c::ssl_print_tmp_key()
temp_key_p = pyOpenSSLutil.ffi.new("EVP_PKEY **")
if not pyOpenSSLutil.lib.SSL_get_server_tmp_key(ssl_object, temp_key_p):
return None
temp_key = temp_key_p[0]
if temp_key == pyOpenSSLutil.ffi.NULL:
return None
temp_key = pyOpenSSLutil.ffi.gc(temp_key, pyOpenSSLutil.lib.EVP_PKEY_free)
key_info = []
key_type = pyOpenSSLutil.lib.EVP_PKEY_id(temp_key)
if key_type == pyOpenSSLutil.lib.EVP_PKEY_RSA:
key_info.append('RSA')
elif key_type == pyOpenSSLutil.lib.EVP_PKEY_DH:
key_info.append('DH')
elif key_type == pyOpenSSLutil.lib.EVP_PKEY_EC:
key_info.append('ECDH')
ec_key = pyOpenSSLutil.lib.EVP_PKEY_get1_EC_KEY(temp_key)
ec_key = pyOpenSSLutil.ffi.gc(ec_key, pyOpenSSLutil.lib.EC_KEY_free)
nid = pyOpenSSLutil.lib.EC_GROUP_get_curve_name(pyOpenSSLutil.lib.EC_KEY_get0_group(ec_key))
cname = pyOpenSSLutil.lib.EC_curve_nid2nist(nid)
if cname == pyOpenSSLutil.ffi.NULL:
cname = pyOpenSSLutil.lib.OBJ_nid2sn(nid)
key_info.append(ffi_buf_to_string(cname))
else:
key_info.append(ffi_buf_to_string(pyOpenSSLutil.lib.OBJ_nid2sn(key_type)))
key_info.append(f'{pyOpenSSLutil.lib.EVP_PKEY_bits(temp_key)} bits')
return ', '.join(key_info)
def get_openssl_version():
system_openssl = OpenSSL.SSL.SSLeay_version(
OpenSSL.SSL.SSLEAY_VERSION
).decode('ascii', errors='replace')
return f'{OpenSSL.version.__version__} ({system_openssl})'
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