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.
86 lines
2.4 KiB
Go
86 lines
2.4 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 X11RequestType = "x11"
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// X11Request is a chunk to contain data for an SSH X11 request
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type X11Request struct {
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*bsr.BaseChunk
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*pssh.X11Request
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}
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// MarshalData serializes an X11Request chunk
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func (r *X11Request) MarshalData(ctx context.Context) ([]byte, error) {
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const op = "ssh.(X11Request).MarshalData"
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dataBytes, err := proto.Marshal(r.X11Request)
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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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// NewX11Request creates an X11Request chunk
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func NewX11Request(ctx context.Context, d bsr.Direction, t *bsr.Timestamp, r *gssh.Request) (*X11Request, error) {
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const op = "ssh.NewX11Request"
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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 != X11RequestType {
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return nil, fmt.Errorf("%s: request type must be %q: %w", op, X11RequestType, 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, X11ReqChunkType)
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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 x11Sigval
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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 := &X11Request{
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BaseChunk: baseChunk,
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X11Request: &pssh.X11Request{
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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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OriginatorAddress: sigval.OriginatorAddress,
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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 x11Sigval struct {
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SenderChannel uint32
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InitialWindowSize uint32
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MaximumPacketSize uint32
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OriginatorAddress string
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OriginatorPort uint32
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}
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