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Directly expose the SSH server KEXT, MAC and Cipher algorithms #86

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Directly expose the SSH server KEXT, MAC and Cipher algorithms #86

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cd0f929
Directly expose the SSH server KEXT, MAC and Cipher algorithms
belak Nov 2, 2018
4703ad4
Expose the gossh.ServerConfig rather than specific values
belak Nov 3, 2018
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25 changes: 25 additions & 0 deletions server.go
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Original file line number Diff line number Diff line change
Expand Up @@ -33,6 +33,19 @@ type Server struct {
IdleTimeout time.Duration // connection timeout when no activity, none if empty
MaxTimeout time.Duration // absolute connection timeout, none if empty

// The allowed key exchanges algorithms. If unspecified then a
// default set of algorithms is used. Most users should not need to set
// this.
KeyExchanges []string

// The allowed cipher algorithms. If unspecified then a sensible
// default is used. Most users should not need to set this.
Ciphers []string

// The allowed MAC algorithms. If unspecified then a sensible default
// is used. Most users should not need to set this.
MACs []string

channelHandlers map[string]channelHandler

listenerWg sync.WaitGroup
Expand All @@ -59,6 +72,18 @@ func (srv *Server) ensureHostSigner() error {

func (srv *Server) config(ctx Context) *gossh.ServerConfig {
config := &gossh.ServerConfig{}
if len(srv.KeyExchanges) > 0 {
config.KeyExchanges = make([]string, len(srv.KeyExchanges))
copy(srv.KeyExchanges, config.KeyExchanges)
}
if len(srv.Ciphers) > 0 {
config.Ciphers = make([]string, len(srv.Ciphers))
copy(srv.Ciphers, config.Ciphers)
}
if len(srv.MACs) > 0 {
config.MACs = make([]string, len(srv.MACs))
copy(srv.MACs, config.MACs)
}
for _, signer := range srv.HostSigners {
config.AddHostKey(signer)
}
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