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.
82 lines
2.3 KiB
Go
82 lines
2.3 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 SessionRequestType = "session"
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// SessionRequest is a chunk to contain data for an SSH Session request
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type SessionRequest struct {
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*bsr.BaseChunk
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*pssh.SessionRequest
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}
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// MarshalData serializes an SessionRequest chunk
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func (r *SessionRequest) MarshalData(ctx context.Context) ([]byte, error) {
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const op = "ssh.(SessionRequest).MarshalData"
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dataBytes, err := proto.Marshal(r.SessionRequest)
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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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// NewSessionRequest creates an SessionRequest chunk
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func NewSessionRequest(ctx context.Context, d bsr.Direction, t *bsr.Timestamp, r *gssh.Request) (*SessionRequest, error) {
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const op = "ssh.NewSessionRequest"
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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 != SessionRequestType {
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return nil, fmt.Errorf("%s: request type must be %q: %w", op, SessionRequestType, 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, SessionReqChunkType)
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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 sessionSigval
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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 := &SessionRequest{
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BaseChunk: baseChunk,
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SessionRequest: &pssh.SessionRequest{
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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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},
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}
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return reqData, nil
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}
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type sessionSigval struct {
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SenderChannel uint32
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InitialWindowSize uint32
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MaximumPacketSize uint32
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}
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