From 7fdd88982aaf31d29bf7b28359dc5c2789d3905a Mon Sep 17 00:00:00 2001 From: Boshi Lian Date: Mon, 30 Jun 2025 15:18:57 -0700 Subject: [PATCH] introduce uri for flexable upstream conn (#615) * Deprecate host and port fields in Upstream message; introduce uri field for connection details * Update libplugin/plugin.proto Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com> * refactor(grpc): streamline upstream connection handling and add GetOrGenerateUri method * refactor(libplugin): update GetOrGenerateUri to return error and add IPv6 test * refactor(libplugin): simplify GetOrGenerateUri to remove error return and update tests * Update cmd/sshpiperd/internal/plugin/grpc.go Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com> --------- Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com> --- cmd/sshpiperd/internal/plugin/grpc.go | 56 ++- libplugin/plugin.pb.go | 650 +++++++++++++------------- libplugin/plugin.proto | 7 +- libplugin/plugin_ext.go | 23 + libplugin/plugin_ext_test.go | 15 + 5 files changed, 418 insertions(+), 333 deletions(-) create mode 100644 libplugin/plugin_ext.go create mode 100644 libplugin/plugin_ext_test.go diff --git a/cmd/sshpiperd/internal/plugin/grpc.go b/cmd/sshpiperd/internal/plugin/grpc.go index 268b4038..fad905a7 100644 --- a/cmd/sshpiperd/internal/plugin/grpc.go +++ b/cmd/sshpiperd/internal/plugin/grpc.go @@ -5,8 +5,8 @@ import ( "fmt" "io" "net" + "net/url" "os/exec" - "strconv" "github.com/google/uuid" log "github.com/sirupsen/logrus" @@ -282,17 +282,6 @@ func (g *GrpcPlugin) createUpstream(conn ssh.ConnMetadata, challengeCtx ssh.Chal return nil, fmt.Errorf("client retry requested") } - port := upstream.Port - if port <= 0 { - port = 22 - } - addr := net.JoinHostPort(upstream.Host, strconv.Itoa(int(port))) - - c, err := net.Dial("tcp", addr) - if err != nil { - return nil, err - } - config := ssh.ClientConfig{ User: upstream.UserName, HostKeyCallback: func(hostname string, addr net.Addr, key ssh.PublicKey) error { @@ -370,22 +359,59 @@ func (g *GrpcPlugin) createUpstream(conn ssh.ConnMetadata, challengeCtx ssh.Chal auth = append(auth, "remotesigner") } + upstreamUri := upstream.GetOrGenerateUri() + if len(config.Auth) == 0 { - log.Warnf("no auth method found for upstream %s, add none auth", addr) + log.Warnf("no auth method found for downstream %s to upstream %s, add none auth", conn.RemoteAddr().String(), upstreamUri) auth = append(auth, "none") config.Auth = append(config.Auth, ssh.NoneAuth()) } - log.Debugf("connecting to upstream %v@%v with auth %v", config.User, c.RemoteAddr().String(), auth) + upstreamConn, addr, err := g.dialUpstream(upstreamUri) + if err != nil { + return nil, err + } + + log.Debugf("connecting to upstream %v@%v with auth %v", config.User, upstreamConn.RemoteAddr().String(), auth) return &ssh.Upstream{ - Conn: c, + Conn: upstreamConn, Address: addr, ClientConfig: config, }, nil } +func (g *GrpcPlugin) dialUpstream(uri string) (net.Conn, string, error) { + var addr string + var network string + + if len(uri) == 0 { + return nil, "", fmt.Errorf("empty upstream uri") + } + + u, err := url.Parse(uri) + if err != nil { + return nil, "", fmt.Errorf("invalid upstream uri: %w", err) + } + + network = u.Scheme + addr = u.Host + if addr == "" { + addr = u.Opaque + } + if addr == "" { + return nil, "", fmt.Errorf("invalid upstream uri, missing address: %s", uri) + } + + upstreamConn, err := net.Dial(network, addr) + if err != nil { + return nil, "", err + } + + return upstreamConn, addr, nil +} + func (g *GrpcPlugin) NoClientAuthCallback(conn ssh.ConnMetadata, challengeCtx ssh.ChallengeContext) (*ssh.Upstream, error) { meta := toMeta(challengeCtx, conn) reply, err := g.client.NoneAuth(context.Background(), &libplugin.NoneAuthRequest{ diff --git a/libplugin/plugin.pb.go b/libplugin/plugin.pb.go index e0aa1250..b69210a6 100644 --- a/libplugin/plugin.pb.go +++ b/libplugin/plugin.pb.go @@ -148,10 +148,17 @@ type Upstream struct { sizeCache protoimpl.SizeCache unknownFields protoimpl.UnknownFields - Host string `protobuf:"bytes,1,opt,name=host,proto3" json:"host,omitempty"` + // Deprecated fields use uri instead. + // + // Deprecated: Do not use. + Host string `protobuf:"bytes,1,opt,name=host,proto3" json:"host,omitempty"` + // Deprecated fields use uri instead. + // + // Deprecated: Do not use. Port int32 `protobuf:"varint,2,opt,name=port,proto3" json:"port,omitempty"` UserName string `protobuf:"bytes,3,opt,name=user_name,json=userName,proto3" json:"user_name,omitempty"` IgnoreHostKey bool `protobuf:"varint,4,opt,name=ignore_host_key,json=ignoreHostKey,proto3" json:"ignore_host_key,omitempty"` + Uri string `protobuf:"bytes,5,opt,name=uri,proto3" json:"uri,omitempty"` // Types that are assignable to Auth: // // *Upstream_None @@ -195,6 +202,7 @@ func (*Upstream) Descriptor() ([]byte, []int) { return file_plugin_proto_rawDescGZIP(), []int{1} } +// Deprecated: Do not use. func (x *Upstream) GetHost() string { if x != nil { return x.Host @@ -202,6 +210,7 @@ func (x *Upstream) GetHost() string { return "" } +// Deprecated: Do not use. func (x *Upstream) GetPort() int32 { if x != nil { return x.Port @@ -223,6 +232,13 @@ func (x *Upstream) GetIgnoreHostKey() bool { return false } +func (x *Upstream) GetUri() string { + if x != nil { + return x.Uri + } + return "" +} + func (m *Upstream) GetAuth() isUpstream_Auth { if m != nil { return m.Auth @@ -2295,329 +2311,331 @@ var file_plugin_proto_rawDesc = []byte{ 0x64, 0x61, 0x74, 0x61, 0x45, 0x6e, 0x74, 0x72, 0x79, 0x12, 0x10, 0x0a, 0x03, 0x6b, 0x65, 0x79, 0x18, 0x01, 0x20, 0x01, 0x28, 0x09, 0x52, 0x03, 0x6b, 0x65, 0x79, 0x12, 0x14, 0x0a, 0x05, 0x76, 0x61, 0x6c, 0x75, 0x65, 0x18, 0x02, 0x20, 0x01, 0x28, 0x09, 0x52, 0x05, 0x76, 0x61, 0x6c, 0x75, - 0x65, 0x3a, 0x02, 0x38, 0x01, 0x22, 0xaa, 0x04, 0x0a, 0x08, 0x55, 0x70, 0x73, 0x74, 0x72, 0x65, - 0x61, 0x6d, 0x12, 0x12, 0x0a, 0x04, 0x68, 0x6f, 0x73, 0x74, 0x18, 0x01, 0x20, 0x01, 0x28, 0x09, - 0x52, 0x04, 0x68, 0x6f, 0x73, 0x74, 0x12, 0x12, 0x0a, 0x04, 0x70, 0x6f, 0x72, 0x74, 0x18, 0x02, - 0x20, 0x01, 0x28, 0x05, 0x52, 0x04, 0x70, 0x6f, 0x72, 0x74, 0x12, 0x1b, 0x0a, 0x09, 0x75, 0x73, - 0x65, 0x72, 0x5f, 0x6e, 0x61, 0x6d, 0x65, 0x18, 0x03, 0x20, 0x01, 0x28, 0x09, 0x52, 0x08, 0x75, - 0x73, 0x65, 0x72, 0x4e, 0x61, 0x6d, 0x65, 0x12, 0x26, 0x0a, 0x0f, 0x69, 0x67, 0x6e, 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0x74, 0x67, 0x31, 0x32, 0x33, 0x2f, + 0x73, 0x73, 0x68, 0x70, 0x69, 0x70, 0x65, 0x72, 0x2f, 0x6c, 0x69, 0x62, 0x70, 0x6c, 0x75, 0x67, + 0x69, 0x6e, 0x62, 0x06, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x33, } var ( diff --git a/libplugin/plugin.proto b/libplugin/plugin.proto index 82814a6b..4cc3cf11 100644 --- a/libplugin/plugin.proto +++ b/libplugin/plugin.proto @@ -12,10 +12,13 @@ message ConnMeta { } message Upstream { - string host = 1; - int32 port = 2; + // Deprecated fields use uri instead. + string host = 1 [deprecated = true]; + // Deprecated fields use uri instead. + int32 port = 2 [deprecated = true]; string user_name = 3; bool ignore_host_key = 4; + string uri = 5; oneof auth { UpstreamNoneAuth none = 100; diff --git a/libplugin/plugin_ext.go b/libplugin/plugin_ext.go new file mode 100644 index 00000000..308de6ae --- /dev/null +++ b/libplugin/plugin_ext.go @@ -0,0 +1,23 @@ +package libplugin + +import ( + "fmt" + "net" + "strconv" +) + +// GetOrGenerateUri returns the existing Uri if set, otherwise constructs it from Host and Port. +func (x *Upstream) GetOrGenerateUri() string { + uri := x.GetUri() + if uri != "" { + return uri + } + + port := x.GetPort() + if port <= 0 { + port = 22 + } + addr := net.JoinHostPort(x.GetHost(), strconv.Itoa(int(port))) + + return fmt.Sprintf("tcp://%v", addr) +} diff --git a/libplugin/plugin_ext_test.go b/libplugin/plugin_ext_test.go new file mode 100644 index 00000000..466237e6 --- /dev/null +++ b/libplugin/plugin_ext_test.go @@ -0,0 +1,15 @@ +package libplugin + +import "testing" + +func TestGetOrGenerateUri_GeneratesUriWithIPv6(t *testing.T) { + up := &Upstream{ + Host: "2001:db8::1", + Port: 2222, + } + + got := up.GetOrGenerateUri() + if got != "tcp://[2001:db8::1]:2222" { + t.Errorf("expected generated uri, got %q", got) + } +}