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.
81 lines
2.3 KiB
Go
81 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 TCPIPForwardRequestType = "tcpip-forward"
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// TCPIPForwardRequest is a chunk to contain data for an SSH TCPIP Forward request
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type TCPIPForwardRequest struct {
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*bsr.BaseChunk
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*pssh.TCPIPForwardRequest
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}
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// MarshalData serializes an TCPIPForwardRequest chunk
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func (r *TCPIPForwardRequest) MarshalData(ctx context.Context) ([]byte, error) {
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const op = "ssh.(TCPIPForwardRequest).MarshalData"
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dataBytes, err := proto.Marshal(r.TCPIPForwardRequest)
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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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// NewTCPIPForwardRequest creates an TCPIPForwardRequest chunk
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func NewTCPIPForwardRequest(ctx context.Context, d bsr.Direction, t *bsr.Timestamp, r *gssh.Request) (*TCPIPForwardRequest, error) {
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const op = "ssh.NewTCPIPForwardRequest"
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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 != TCPIPForwardRequestType {
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return nil, fmt.Errorf("%s: request type must be %q: %w", op, TCPIPForwardRequestType, 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, TCPIPForwardReqChunkType)
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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 tCPIPForwardSigval
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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 := &TCPIPForwardRequest{
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BaseChunk: baseChunk,
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TCPIPForwardRequest: &pssh.TCPIPForwardRequest{
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RequestType: r.Type,
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WantReply: r.WantReply,
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AddressToBind: sigval.AddressToBind,
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PortToBind: sigval.PortToBind,
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},
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}
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return reqData, nil
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}
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type tCPIPForwardSigval struct {
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AddressToBind string
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PortToBind uint32
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}
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