Hi Arne,
I haven't looked at the code, only at strings for now, and I'd like to
pick a few nits.
Am 26.09.18 um 15:44 schrieb Arne Schwabe:
> OpenSSL 1.1.1 introduces a seperate list for TLS 1.3 ciphers. As these
> interfaces are meant to be user facing or not exposed at all and we
> expose the tls-cipher interface, we should also expose tls-cipherlist.
> [...]
> index 15a10296..0b44a29d 100644
> --- a/doc/openvpn.8
> +++ b/doc/openvpn.8
> @@ -5001,11 +5001,13 @@ determines the derivation of the tunnel session keys.
> .\"*********************************************************
> .TP
> .B \-\-tls\-cipher l
> +.TQ
> +.B \-\-tls\-ciphersuites l
> A list
> .B l
> of allowable TLS ciphers delimited by a colon (":").
>
> -This setting can be used to ensure that certain cipher suites are used (or
> +These setting can be used to ensure that certain cipher suites are used (or
These setting_s_ ...
> not used) for the TLS connection. OpenVPN uses TLS to secure the control
> channel, over which the keys that are used to protect the actual VPN traffic
> are exchanged.
> @@ -5014,13 +5016,24 @@ The supplied list of ciphers is (after potential
> OpenSSL/IANA name translation)
> simply supplied to the crypto library. Please see the OpenSSL and/or mbed
> TLS
> documentation for details on the cipher list interpretation.
>
> +For OpenSSL the
add a comma before "the"
> +.B \-\-tls-cipher
> +is used for TLS 1.2 and below. For TLS 1.3 and up
add a comma at the end.
> +the
> +.B \-\-tls\-ciphersuites
> +setting is used. mbed TLS has no TLS 1.3 support yet and only the
> +.B \-\-tls-cipher
> +setting is used.
> +
> Use
> .B \-\-show\-tls
> to see a list of TLS ciphers supported by your crypto library.
>
> Warning!
> .B \-\-tls\-cipher
> -is an expert feature, which \- if used correcly \- can improve the security
> of
> +and
> +.B \-\-tls\-ciphersuites
> +are expert features, which \- if used correcly \- can improve the security of
> your VPN connection. But it is also easy to unwittingly use it to carefully
...use _them_...
> + msg(M_WARN, "mbed TLS does not support setting tls-ciphersuites. Ignoring
> TLS 1.3 cipher list: %s", ciphers);
> +}
> +
Is the blank between mbed and TLS right?
Cheers,
Matthias
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