mirror of
https://github.com/gravitational/teleport.git
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rosstimothy
2cced62805
Depends on https://github.com/gravitational/teleport.e/pull/6006. Now that we are compliant, the ignore rule was removed from the golangci-lint config to prevent future regressions.
120 lines
4.0 KiB
Go
120 lines
4.0 KiB
Go
/*
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Copyright 2021 Gravitational, Inc.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package sshutils
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import (
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"bytes"
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"encoding/json"
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"io"
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"github.com/gravitational/trace"
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"golang.org/x/crypto/ssh"
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"github.com/gravitational/teleport/api/constants"
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"github.com/gravitational/teleport/api/types"
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)
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// ConnectProxyTransport opens a channel over the remote tunnel and connects
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// to the requested host.
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//
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// Returns the net.Conn wrapper over an SSH channel, whether the provided ssh.Conn
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// should be considered invalid due to errors opening or sending a request to the
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// channel while setting up the ChConn, and any error that occurs.
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func ConnectProxyTransport(sconn ssh.Conn, req *DialReq, exclusive bool) (conn *ChConn, invalid bool, err error) {
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if err := req.CheckAndSetDefaults(); err != nil {
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return nil, false, trace.Wrap(err)
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}
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payload, err := json.Marshal(req)
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if err != nil {
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return nil, false, trace.Wrap(err)
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}
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channel, reqC, err := sconn.OpenChannel(constants.ChanTransport, nil)
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if err != nil {
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return nil, true, trace.Wrap(err)
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}
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// DiscardRequests will return when the channel or underlying connection is closed.
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go ssh.DiscardRequests(reqC)
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// Send a special SSH out-of-band request called "teleport-transport"
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// the agent on the other side will create a new TCP/IP connection to
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// 'addr' on its network and will start proxying that connection over
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// this SSH channel.
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ok, err := channel.SendRequest(constants.ChanTransportDialReq, true, payload)
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if err != nil {
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return nil, true, trace.NewAggregate(trace.Wrap(err), channel.Close())
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}
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if !ok {
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defer channel.Close()
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// Pull the error message from the tunnel client (remote cluster)
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// passed to us via stderr.
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errMessageBytes, _ := io.ReadAll(channel.Stderr())
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errMessage := string(bytes.TrimSpace(errMessageBytes))
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if errMessage != "" {
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return nil, false, trace.Errorf("%s", errMessage)
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}
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return nil, false, trace.Errorf("failed connecting to %v [%v]", req.Address, req.ServerID)
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}
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if exclusive {
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return NewExclusiveChConn(sconn, channel), false, nil
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}
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return NewChConn(sconn, channel), false, nil
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}
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// DialReq is a request for the address to connect to. Supports special
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// non-resolvable addresses and search names if connection over a tunnel.
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type DialReq struct {
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// Address is the target host to make a connection to.
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Address string `json:"address,omitempty"`
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// ServerID is the hostUUID.clusterName of the node. ServerID is used when
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// dialing through a tunnel to SSH and application nodes.
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ServerID string `json:"server_id,omitempty"`
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// ConnType is the type of connection requested, either node or application.
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ConnType types.TunnelType `json:"conn_type"`
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// ClientSrcAddr is the original observed client address, it is used to propagate
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// correct client IP through indirect connections inside teleport
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ClientSrcAddr string `json:"client_src_addr,omitempty"`
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// ClientDstAddr is the original client's destination address, it is used to propagate
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// correct client point of contact through indirect connections inside teleport
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ClientDstAddr string `json:"client_dst_addr,omitempty"`
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// IsAgentlessNode specifies whether the target is an agentless node.
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IsAgentlessNode bool `json:"is_agentless_node,omitempty"`
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}
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// CheckAndSetDefaults verifies all the values are valid.
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func (d *DialReq) CheckAndSetDefaults() error {
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if d.ConnType == "" {
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d.ConnType = types.NodeTunnel
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}
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if d.Address == "" && d.ServerID == "" {
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return trace.BadParameter("serverID or address required")
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}
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return nil
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}
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