pmgproxy: document newly added options

adapted from pve-docs -> pveproxy

Signed-off-by: Fabian Grünbichler <f.gruenbichler@proxmox.com>

diff --git a/pmgproxy.adoc b/pmgproxy.adoc
index 6e48fbab31005032c4e69ec19f15983beb8f0163..101f269dc5bd6d6edb8255f3865653762a1e4be3 100644 (file)
--- a/pmgproxy.adoc
+++ b/pmgproxy.adoc
@@ -125,7 +125,10 @@ should set a maintenance window to bring this change into effect.
 SSL Cipher Suite
 ----------------
 
-You can define the cipher list in `/etc/default/pmgproxy`, for example:
+You can define the cipher list in `/etc/default/pmgproxy`, via the `CIPHERS`
+(TLS <= 1.2) and `CIPHERSUITES` (TLS >= 1.3) keys.
+
+For example:
 
  CIPHERS="ECDHE-ECDSA-AES256-GCM-SHA384:ECDHE-RSA-AES256-GCM-SHA384:ECDHE-ECDSA-CHACHA20-POLY1305:ECDHE-RSA-CHACHA20-POLY1305:ECDHE-ECDSA-AES128-GCM-SHA256:ECDHE-RSA-AES128-GCM-SHA256:ECDHE-ECDSA-AES256-SHA384:ECDHE-RSA-AES256-SHA384:ECDHE-ECDSA-AES128-SHA256:ECDHE-RSA-AES128-SHA256"
 
@@ -141,6 +144,25 @@ by disabling the HONOR_CIPHER_ORDER option in `/etc/default/pmgproxy`:
  HONOR_CIPHER_ORDER=0
 
 
+Supported TLS versions
+----------------------
+
+The insecure SSL versions 2 and 3 are unconditionally disabled for `pmgproxy`.
+TLS versions below 1.1 are disabled by default on recent OpenSSL versions,
+which is honored by `pmgproxy` (see `/etc/ssl/openssl.cnf`).
+
+To disable TLS version 1.2, set the following in `/etc/default/pmgproxy`:
+
+ DISABLE_TLS_1_2=1
+
+or, respectively, to disable TLS version 1.3:
+
+ DISABLE_TLS_1_3=1
+
+NOTE: Unless there is a specific reason to do so, it is not recommended to
+manually adjust the supported TLS versions.
+
+
 Diffie-Hellman Parameters
 -------------------------