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doc: add not that DTLS 1.0, TLS 1.1 and before are disabled at security level 1 

Reviewed-by: Tomas Mraz <tomas@openssl.org>
Reviewed-by: Dmitry Belyavskiy <beldmit@gmail.com>
(Merged from https://github.com/openssl/openssl/pull/18236)
This commit is contained in:
Pauli 2022-05-06 10:42:16 +10:00
parent 7bf2e4d7f0
commit 54b0c534ee
1 changed files with 5 additions and 6 deletions
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11
doc/man3/SSL_CTX_set_security_level.pod
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@ -78,29 +78,28 @@ DSA and DH keys shorter than 1024 bits and ECC keys shorter than 160 bits
are prohibited. Any cipher suite using MD5 for the MAC is also prohibited. Any
cipher suites using CCM with a 64 bit authentication tag are prohibited. Note
that signatures using SHA1 and MD5 are also forbidden at this level as they
have less than 80 security bits.
have less than 80 security bits. Additionally, SSLv3, TLS 1.0, TLS 1.1 and
DTLS 1.0 are all disabled at this level.
=item B<Level 2>
Security level set to 112 bits of security. As a result RSA, DSA and DH keys
shorter than 2048 bits and ECC keys shorter than 224 bits are prohibited.
In addition to the level 1 exclusions any cipher suite using RC4 is also
prohibited. SSL version 3 is also not allowed. Compression is disabled.
prohibited. Compression is disabled.
=item B<Level 3>
Security level set to 128 bits of security. As a result RSA, DSA and DH keys
shorter than 3072 bits and ECC keys shorter than 256 bits are prohibited.
In addition to the level 2 exclusions cipher suites not offering forward
secrecy are prohibited. TLS versions below 1.1 are not permitted. Session
tickets are disabled.
secrecy are prohibited. Session tickets are disabled.
=item B<Level 4>
Security level set to 192 bits of security. As a result RSA, DSA and
DH keys shorter than 7680 bits and ECC keys shorter than 384 bits are
prohibited. Cipher suites using SHA1 for the MAC are prohibited. TLS
versions below 1.2 are not permitted.
prohibited. Cipher suites using SHA1 for the MAC are prohibited.
=item B<Level 5>