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
2.1 KiB
Go
79 lines
2.1 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 ExecRequestType = "exec"
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// ExecRequest is a chunk to contain data for an SSH Exec request
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type ExecRequest struct {
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*bsr.BaseChunk
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*pssh.ExecRequest
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}
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// MarshalData serializes an ExecRequest chunk
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func (r *ExecRequest) MarshalData(ctx context.Context) ([]byte, error) {
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const op = "ssh.(ExecRequest).MarshalData"
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dataBytes, err := proto.Marshal(r.ExecRequest)
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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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// NewExecRequest creates an ExecRequest chunk
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func NewExecRequest(ctx context.Context, d bsr.Direction, t *bsr.Timestamp, r *gssh.Request) (*ExecRequest, error) {
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const op = "ssh.NewExecRequest"
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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 != ExecRequestType {
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return nil, fmt.Errorf("%s: request type must be %q: %w", op, ExecRequestType, 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, ExecReqChunkType)
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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 execSigval
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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 := &ExecRequest{
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BaseChunk: baseChunk,
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ExecRequest: &pssh.ExecRequest{
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RequestType: r.Type,
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WantReply: r.WantReply,
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Command: sigval.Command,
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},
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}
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return reqData, nil
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}
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type execSigval struct {
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Command string
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}
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