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| author | Christian Heimes <christian@python.org> | 2021-05-01 18:53:10 (GMT) |
|---|---|---|
| committer | GitHub <noreply@github.com> | 2021-05-01 18:53:10 (GMT) |
| commit | e983252b516edb15d4338b0a47631b59ef1e2536 (patch) | |
| tree | e57aad415654f5ce8646cf10fd293a5e8e1c0ad4 /Doc/library/ssl.rst | |
| parent | 50c21ad35372983680b44130be560d856c5f27ca (diff) | |
| download | cpython-e983252b516edb15d4338b0a47631b59ef1e2536.zip cpython-e983252b516edb15d4338b0a47631b59ef1e2536.tar.gz cpython-e983252b516edb15d4338b0a47631b59ef1e2536.tar.bz2 | |
bpo-43998: Default to TLS 1.2 and increase cipher suite security (GH-25778)
The ssl module now has more secure default settings. Ciphers without forward
secrecy or SHA-1 MAC are disabled by default. Security level 2 prohibits
weak RSA, DH, and ECC keys with less than 112 bits of security.
:class:`~ssl.SSLContext` defaults to minimum protocol version TLS 1.2.
Settings are based on Hynek Schlawack's research.
```
$ openssl version
OpenSSL 1.1.1k FIPS 25 Mar 2021
$ openssl ciphers -v '@SECLEVEL=2:ECDH+AESGCM:ECDH+CHACHA20:ECDH+AES:DHE+AES:!aNULL:!eNULL:!aDSS:!SHA1:!AESCCM'
TLS_AES_256_GCM_SHA384 TLSv1.3 Kx=any Au=any Enc=AESGCM(256) Mac=AEAD
TLS_CHACHA20_POLY1305_SHA256 TLSv1.3 Kx=any Au=any Enc=CHACHA20/POLY1305(256) Mac=AEAD
TLS_AES_128_GCM_SHA256 TLSv1.3 Kx=any Au=any Enc=AESGCM(128) Mac=AEAD
TLS_AES_128_CCM_SHA256 TLSv1.3 Kx=any Au=any Enc=AESCCM(128) Mac=AEAD
ECDHE-ECDSA-AES256-GCM-SHA384 TLSv1.2 Kx=ECDH Au=ECDSA Enc=AESGCM(256) Mac=AEAD
ECDHE-RSA-AES256-GCM-SHA384 TLSv1.2 Kx=ECDH Au=RSA Enc=AESGCM(256) Mac=AEAD
ECDHE-ECDSA-AES128-GCM-SHA256 TLSv1.2 Kx=ECDH Au=ECDSA Enc=AESGCM(128) Mac=AEAD
ECDHE-RSA-AES128-GCM-SHA256 TLSv1.2 Kx=ECDH Au=RSA Enc=AESGCM(128) Mac=AEAD
ECDHE-ECDSA-CHACHA20-POLY1305 TLSv1.2 Kx=ECDH Au=ECDSA Enc=CHACHA20/POLY1305(256) Mac=AEAD
ECDHE-RSA-CHACHA20-POLY1305 TLSv1.2 Kx=ECDH Au=RSA Enc=CHACHA20/POLY1305(256) Mac=AEAD
ECDHE-ECDSA-AES256-SHA384 TLSv1.2 Kx=ECDH Au=ECDSA Enc=AES(256) Mac=SHA384
ECDHE-RSA-AES256-SHA384 TLSv1.2 Kx=ECDH Au=RSA Enc=AES(256) Mac=SHA384
ECDHE-ECDSA-AES128-SHA256 TLSv1.2 Kx=ECDH Au=ECDSA Enc=AES(128) Mac=SHA256
ECDHE-RSA-AES128-SHA256 TLSv1.2 Kx=ECDH Au=RSA Enc=AES(128) Mac=SHA256
DHE-RSA-AES256-GCM-SHA384 TLSv1.2 Kx=DH Au=RSA Enc=AESGCM(256) Mac=AEAD
DHE-RSA-AES128-GCM-SHA256 TLSv1.2 Kx=DH Au=RSA Enc=AESGCM(128) Mac=AEAD
DHE-RSA-AES256-SHA256 TLSv1.2 Kx=DH Au=RSA Enc=AES(256) Mac=SHA256
DHE-RSA-AES128-SHA256 TLSv1.2 Kx=DH Au=RSA Enc=AES(128) Mac=SHA256
```
Signed-off-by: Christian Heimes <christian@python.org>
Diffstat (limited to 'Doc/library/ssl.rst')
| -rw-r--r-- | Doc/library/ssl.rst | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/Doc/library/ssl.rst b/Doc/library/ssl.rst index f7c49dc..4d43fa0 100644 --- a/Doc/library/ssl.rst +++ b/Doc/library/ssl.rst @@ -1509,6 +1509,14 @@ to speed up repeated connections from the same clients. context class will either require :data:`PROTOCOL_TLS_CLIENT` or :data:`PROTOCOL_TLS_SERVER` protocol in the future. + .. versionchanged:: 3.10 + + The default cipher suites now include only secure AES and ChaCha20 + ciphers with forward secrecy and security level 2. RSA and DH keys with + less than 2048 bits and ECC keys with less than 224 bits are prohibited. + :data:`PROTOCOL_TLS`, :data:`PROTOCOL_TLS_CLIENT`, and + :data:`PROTOCOL_TLS_SERVER` use TLS 1.2 as minimum TLS version. + :class:`SSLContext` objects have the following methods and attributes: |