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 SubsystemRequestType = "subsystem"
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// SubsystemRequest is a chunk to contain data for an SSH Subsystem request
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type SubsystemRequest struct {
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*bsr.BaseChunk
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*pssh.SubsystemRequest
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}
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// MarshalData serializes an SubsystemRequest chunk
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func (r *SubsystemRequest) MarshalData(ctx context.Context) ([]byte, error) {
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const op = "ssh.(SubsystemRequest).MarshalData"
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dataBytes, err := proto.Marshal(r.SubsystemRequest)
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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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// NewSubsystemRequest creates an SubsystemRequest chunk
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func NewSubsystemRequest(ctx context.Context, d bsr.Direction, t *bsr.Timestamp, r *gssh.Request) (*SubsystemRequest, error) {
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const op = "ssh.NewSubsystemRequest"
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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 != SubsystemRequestType {
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return nil, fmt.Errorf("%s: request type must be %q: %w", op, SubsystemRequestType, 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, SubsystemReqChunkType)
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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 subsystemSigval
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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 := &SubsystemRequest{
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BaseChunk: baseChunk,
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SubsystemRequest: &pssh.SubsystemRequest{
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RequestType: r.Type,
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WantReply: r.WantReply,
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SubsystemName: sigval.SubsystemName,
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},
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}
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return reqData, nil
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}
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type subsystemSigval struct {
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SubsystemName string
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}
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