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.
79 lines
2.2 KiB
Go
79 lines
2.2 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 XonXoffRequestType = "xon-xoff"
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// XonXoffRequest is a chunk to contain data for an SSH Xon Xoff request
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type XonXoffRequest struct {
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*bsr.BaseChunk
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*pssh.XonXoffRequest
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}
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// MarshalData serializes an XonXoffRequest chunk
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func (r *XonXoffRequest) MarshalData(ctx context.Context) ([]byte, error) {
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const op = "ssh.(XonXoffRequest).MarshalData"
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dataBytes, err := proto.Marshal(r.XonXoffRequest)
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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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// NewXonXoffRequest creates an XonXoffRequest chunk
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func NewXonXoffRequest(ctx context.Context, d bsr.Direction, t *bsr.Timestamp, r *gssh.Request) (*XonXoffRequest, error) {
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const op = "ssh.NewXonXoffRequest"
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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 != XonXoffRequestType {
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return nil, fmt.Errorf("%s: request type must be %q: %w", op, XonXoffRequestType, 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, XonXoffReqChunkType)
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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 xonXoffSigval
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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 := &XonXoffRequest{
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BaseChunk: baseChunk,
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XonXoffRequest: &pssh.XonXoffRequest{
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RequestType: r.Type,
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WantReply: r.WantReply,
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ClientCanDo: sigval.ClientCanDo,
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},
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}
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return reqData, nil
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}
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type xonXoffSigval struct {
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ClientCanDo bool
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}
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