Timothy Messier
f983a05a3e
This adds a function for decoding all of the SSH Chunk types and registers the function with the chunk types so that the bsr.ChunkDecode can be used to decode SSH Chunks.
90 lines
2.7 KiB
Go
90 lines
2.7 KiB
Go
// Copyright (c) HashiCorp, Inc.
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// SPDX-License-Identifier: MPL-2.0
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package ssh
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import (
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"context"
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"fmt"
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"github.com/hashicorp/boundary/internal/bsr"
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pssh "github.com/hashicorp/boundary/internal/bsr/gen/ssh/v1"
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"github.com/hashicorp/boundary/internal/bsr/internal/is"
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gssh "golang.org/x/crypto/ssh"
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"google.golang.org/protobuf/proto"
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)
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const DirectTCPIPRequestType = "direct-tcpip"
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// DirectTCPIPRequest is a chunk to contain data for an SSH Direct TCPIP request
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type DirectTCPIPRequest struct {
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*bsr.BaseChunk
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*pssh.DirectTCPIPRequest
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}
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// MarshalData serializes a DirectTCPIPRequest chunk
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func (r *DirectTCPIPRequest) MarshalData(ctx context.Context) ([]byte, error) {
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const op = "ssh.(DirectTCPIPRequest).MarshalData"
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dataBytes, err := proto.Marshal(r.DirectTCPIPRequest)
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if err != nil {
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return nil, fmt.Errorf("%s: failed to marshal data: %w", op, err)
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}
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d := make([]byte, 0, len(dataBytes))
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d = append(d, dataBytes...)
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return d, nil
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}
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// NewDirectTCPIPRequest creates a DirectTCPIPRequest chunk
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func NewDirectTCPIPRequest(ctx context.Context, d bsr.Direction, t *bsr.Timestamp, r *gssh.Request) (*DirectTCPIPRequest, error) {
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const op = "ssh.NewDirectTCPIPRequest"
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if is.Nil(r) {
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return nil, fmt.Errorf("%s: request cannot be nil: %w", op, bsr.ErrInvalidParameter)
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}
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if r.Type != DirectTCPIPRequestType {
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return nil, fmt.Errorf("%s: request type must be %q: %w", op, DirectTCPIPRequestType, bsr.ErrInvalidParameter)
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}
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if !bsr.ValidDirection(d) {
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return nil, fmt.Errorf("%s: invalid direction: %w", op, bsr.ErrInvalidParameter)
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}
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if is.Nil(t) {
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return nil, fmt.Errorf("%s: timestamp cannot be nil: %w", op, bsr.ErrInvalidParameter)
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}
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baseChunk, err := bsr.NewBaseChunk(ctx, Protocol, d, t, DirectTCPIPReqChunkType)
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if err != nil {
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return nil, fmt.Errorf("%s: unable to create base chunk: %w", op, err)
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}
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var sigval directTCPIPSigval
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if err := gssh.Unmarshal(r.Payload, &sigval); err != nil {
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return nil, fmt.Errorf("%s: unable to unmarshal payload: %w", op, err)
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}
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reqData := &DirectTCPIPRequest{
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BaseChunk: baseChunk,
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DirectTCPIPRequest: &pssh.DirectTCPIPRequest{
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RequestType: r.Type,
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SenderChannel: sigval.SenderChannel,
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InitialWindowSize: sigval.InitialWindowSize,
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MaximumPacketSize: sigval.MaximumPacketSize,
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Host: sigval.Host,
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Port: sigval.Port,
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OriginatorIpAddress: sigval.OriginatorIpAddress,
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OriginatorPort: sigval.OriginatorPort,
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},
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}
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return reqData, nil
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}
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type directTCPIPSigval struct {
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SenderChannel uint32
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InitialWindowSize uint32
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MaximumPacketSize uint32
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Host string
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Port uint32
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OriginatorIpAddress string
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OriginatorPort uint32
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}
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