undefined symbol: EVP_CIPHER_CTX_cleanup

2020-07-19
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openssl升级到1.1.0以上版本，应用启动报undefined symbol: EVP_CIPHER_CTX_cleanup错误。

  File "/usr/local/bin/sslocal", line 11, in <module>
    load_entry_point('shadowsocks==2.8.2', 'console_scripts', 'sslocal')()
  File "/usr/local/lib/python3.6/site-packages/shadowsocks/local.py", line 39, in main
    config = shell.get_config(True)
  File "/usr/local/lib/python3.6/site-packages/shadowsocks/shell.py", line 262, in get_config
    check_config(config, is_local)
  File "/usr/local/lib/python3.6/site-packages/shadowsocks/shell.py", line 124, in check_config
    encrypt.try_cipher(config['password'], config['method'])
  File "/usr/local/lib/python3.6/site-packages/shadowsocks/encrypt.py", line 44, in try_cipher
    Encryptor(key, method)
  File "/usr/local/lib/python3.6/site-packages/shadowsocks/encrypt.py", line 83, in __init__
    random_string(self._method_info[1]))
  File "/usr/local/lib/python3.6/site-packages/shadowsocks/encrypt.py", line 109, in get_cipher
    return m[2](method, key, iv, op)
  File "/usr/local/lib/python3.6/site-packages/shadowsocks/crypto/openssl.py", line 76, in __init__
    load_openssl()
  File "/usr/local/lib/python3.6/site-packages/shadowsocks/crypto/openssl.py", line 52, in load_openssl
    libcrypto.EVP_CIPHER_CTX_cleanup.argtypes = (c_void_p,)
  File "/usr/lib64/python3.6/ctypes/__init__.py", line 356, in __getattr__
    func = self.__getitem__(name)
  File "/usr/lib64/python3.6/ctypes/__init__.py", line 361, in __getitem__
    func = self._FuncPtr((name_or_ordinal, self))

这个问题是由于在openssl1.1.0版本中，废弃了EVP_CIPHER_CTX_cleanup函数。官网解释

EVP_CIPHER_CTX was made opaque in OpenSSL 1.1.0. As a result, EVP_CIPHER_CTX_reset() appeared and EVP_CIPHER_CTX_cleanup() disappeared.

修复

把用到 EVP_CIPHER_CTX_cleanup 的改成EVP_CIPHER_CTX_reset。

修复例子

im /usr/local/lib/python3.6/site-packages/shadowsocks/crypto/openssl.py

将第52行libcrypto.EVP_CIPHER_CTX_cleanup.argtypes = (c_void_p,)
改为libcrypto.EVP_CIPHER_CTX_reset.argtypes = (c_void_p,)
再次搜索cleanup（全文件共2处，此处位于111行），将libcrypto.EVP_CIPHER_CTX_cleanup(self._ctx)
改为libcrypto.EVP_CIPHER_CTX_reset(self._ctx)

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