Hi,
On 25/03/2021 01:01, Arne Schwabe wrote:
> The non-TLS mode is a relict from OpenVPN 1.x or 2.0. When tls mode was
> introduce the advantages of TLS over non-tls were small but tls mode
> evolved to include a lot more features. (NCP, multipeer, AEAD ciphers to name
> a few).
>
> Today VPN that use --secret are mainly used because of its relative easy to
> setup and requiring to setup a PKI. This shortcoming of TLS mode should be
> addressed now with the peer-fingerprint option.
>
> Signed-off-by: Arne Schwabe <[email protected]>
As per the discussion that sparked in this thread, I would suggest
articulating the commit message a bit more to highlight the security
concerns about using --secret and why it's a good idea to get rid of it.
The rest looks good to me.
Cheers,
> ---
> doc/man-sections/protocol-options.rst | 2 +-
> src/openvpn/options.c | 12 +++++++++++-
> 2 files changed, 12 insertions(+), 2 deletions(-)
>
> diff --git a/doc/man-sections/protocol-options.rst
> b/doc/man-sections/protocol-options.rst
> index 01789e58..4b6928c6 100644
> --- a/doc/man-sections/protocol-options.rst
> +++ b/doc/man-sections/protocol-options.rst
> @@ -235,7 +235,7 @@ configured in a compatible way between both the local and
> remote side.
> disables cipher negotiation.
>
> --secret args
> - Enable Static Key encryption mode (non-TLS). Use pre-shared secret
> + **DEPRECATED** Enable Static Key encryption mode (non-TLS). Use pre-shared
> secret
> ``file`` which was generated with ``--genkey``.
>
> Valid syntaxes:
> diff --git a/src/openvpn/options.c b/src/openvpn/options.c
> index e52679f0..5b559edf 100644
> --- a/src/openvpn/options.c
> +++ b/src/openvpn/options.c
> @@ -514,7 +514,7 @@ static const char usage_message[] =
> "\n"
> "Data Channel Encryption Options (must be compatible between peers):\n"
> "(These options are meaningful for both Static Key & TLS-mode)\n"
> - "--secret f [d] : Enable Static Key encryption mode (non-TLS).\n"
> + "--secret f [d] : (DEPRECATED) Enable Static Key encryption mode
> (non-TLS).\n"
> " Use shared secret file f, generate with --genkey.\n"
> " The optional d parameter controls key
> directionality.\n"
> " If d is specified, use separate keys for each\n"
> @@ -2564,6 +2564,15 @@ options_postprocess_verify_ce(const struct options
> *options,
> msg(M_USAGE, "specify only one of --tls-server, --tls-client, or
> --secret");
> }
>
> + if (!options->tls_server || !options->tls_client)
> + {
> + msg(M_INFO, "DEPRECATION: No tls-client or tls-server option in "
> + "configuration detected. OpenVPN 2.7 will remove the "
> + "functionality to run a VPN without TLS. "
> + "See the examples section in the manual page for "
> + "examples of a similar quick setup with
> peer-fingerprint.");
> + }
> +
> if (options->ssl_flags &
> (SSLF_CLIENT_CERT_NOT_REQUIRED|SSLF_CLIENT_CERT_OPTIONAL))
> {
> msg(M_WARN, "WARNING: POTENTIALLY DANGEROUS OPTION "
> @@ -7868,6 +7877,7 @@ add_option(struct options *options,
> }
> else if (streq(p[0], "secret") && p[1] && !p[3])
> {
> + msg(M_WARN, "DEPRECATED OPTION: The option --secret is deprecated.
> ");
> VERIFY_PERMISSION(OPT_P_GENERAL|OPT_P_INLINE);
> options->shared_secret_file = p[1];
> options->shared_secret_file_inline = is_inline;
>
--
Antonio Quartulli
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