ssh: add server side support for Diffie Hellman Group Exchange

We add this support for the following reasons:

- We are planning to expose recommended (secure) vs. supported (works,
  not necessarily recommended) algorithms. The DHGEX kex is currently
  only exposed as a client-side kex. To simplify the calling convention
  for this follow-on, we expose the server side too.
- Some clients are quite inflexible with reference to kex algorithms
  choice, for example they offer:

  diffie-hellman-group-exchange-sha256, diffie-hellman-group-exchange-sha1,
  diffie-hellman-group14-sha1, diffie-hellman-group1-sha1

  therefore DHGEX helps interoperability.

We do not recommend the DHGEX kex as a whole:

- the negotiation requires an extra round trip
- the server must generate parameters (slow) or hardcode them, which
  defeats the security benefit over traditional DH.

In this implementation we hardcode sending Oakley Group 14, Oakley
Group 15 or Oakley Group 16 based on the requested max size.

Users that are concerned with security of classical DH kex should
migrate to kex based on EC or Ed25519.

Fixes golang/go#54743

Change-Id: I127822e90efc36821af4aca679931f40a2023021
Reviewed-on: https://go-review.googlesource.com/c/crypto/+/532415
Reviewed-by: Michael Knyszek <mknyszek@google.com>
Auto-Submit: Nicola Murino <nicola.murino@gmail.com>
Reviewed-by: Filippo Valsorda <filippo@golang.org>
Reviewed-by: Han-Wen Nienhuys <hanwen@google.com>
Reviewed-by: Cherry Mui <cherryyz@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>

1 files changed, 0 insertions, 7 deletions

diff --git a/ssh/common.go b/ssh/common.go
index b98b51c..0415d33 100644
--- a/ssh/common.go
+++ b/ssh/common.go
@@ -279,13 +279,6 @@ func InsecureAlgorithms() Algorithms {
 	}
 }
 
-// serverForbiddenKexAlgos contains key exchange algorithms, that are forbidden
-// for the server half.
-var serverForbiddenKexAlgos = map[string]struct{}{
-	InsecureKeyExchangeDHGEXSHA1: {}, // server half implementation is only minimal to satisfy the automated tests
-	KeyExchangeDHGEXSHA256:       {}, // server half implementation is only minimal to satisfy the automated tests
-}
-
 var supportedCompressions = []string{compressionNone}
 
 // hashFuncs keeps the mapping of supported signature algorithms to their