diff options
Diffstat (limited to 'vendor/golang.org/x/crypto/ssh/server.go')
| -rw-r--r-- | vendor/golang.org/x/crypto/ssh/server.go | 21 |
1 files changed, 20 insertions, 1 deletions
diff --git a/vendor/golang.org/x/crypto/ssh/server.go b/vendor/golang.org/x/crypto/ssh/server.go index 8a78b7ca0..b83d47388 100644 --- a/vendor/golang.org/x/crypto/ssh/server.go +++ b/vendor/golang.org/x/crypto/ssh/server.go @@ -95,6 +95,10 @@ type ServerConfig struct { // Note that RFC 4253 section 4.2 requires that this string start with // "SSH-2.0-". ServerVersion string + + // BannerCallback, if present, is called and the return string is sent to + // the client after key exchange completed but before authentication. + BannerCallback func(conn ConnMetadata) string } // AddHostKey adds a private key as a host key. If an existing host @@ -252,7 +256,7 @@ func (s *connection) serverHandshake(config *ServerConfig) (*Permissions, error) func isAcceptableAlgo(algo string) bool { switch algo { case KeyAlgoRSA, KeyAlgoDSA, KeyAlgoECDSA256, KeyAlgoECDSA384, KeyAlgoECDSA521, KeyAlgoED25519, - CertAlgoRSAv01, CertAlgoDSAv01, CertAlgoECDSA256v01, CertAlgoECDSA384v01, CertAlgoECDSA521v01: + CertAlgoRSAv01, CertAlgoDSAv01, CertAlgoECDSA256v01, CertAlgoECDSA384v01, CertAlgoECDSA521v01, CertAlgoED25519v01: return true } return false @@ -312,6 +316,7 @@ func (s *connection) serverAuthenticate(config *ServerConfig) (*Permissions, err authFailures := 0 var authErrs []error + var displayedBanner bool userAuthLoop: for { @@ -343,6 +348,20 @@ userAuthLoop: } s.user = userAuthReq.User + + if !displayedBanner && config.BannerCallback != nil { + displayedBanner = true + msg := config.BannerCallback(s) + if msg != "" { + bannerMsg := &userAuthBannerMsg{ + Message: msg, + } + if err := s.transport.writePacket(Marshal(bannerMsg)); err != nil { + return nil, err + } + } + } + perms = nil authErr := errors.New("no auth passed yet") |