diff options
| -rw-r--r-- | collect.go | 270 | ||||
| -rw-r--r-- | go.mod | 4 | ||||
| -rw-r--r-- | go.sum | 128 | ||||
| -rw-r--r-- | main.go | 12 |
4 files changed, 412 insertions, 2 deletions
diff --git a/collect.go b/collect.go new file mode 100644 index 0000000..c1e2c6d --- /dev/null +++ b/collect.go @@ -0,0 +1,270 @@ +package main + +import ( + "container/heap" + "context" + "crypto/sha256" + "encoding/json" + "fmt" + "net/http" + "os" + "os/signal" + "strings" + "sync" + "syscall" + "time" + + "git.cs.kau.se/rasmoste/ct-sans/internal/chunk" + "git.cs.kau.se/rasmoste/ct-sans/internal/utils" + ct "github.com/google/certificate-transparency-go" + "github.com/google/certificate-transparency-go/client" + "github.com/google/certificate-transparency-go/jsonclient" + "github.com/google/certificate-transparency-go/scanner" + "gitlab.torproject.org/rgdd/ct/pkg/merkle" + "gitlab.torproject.org/rgdd/ct/pkg/metadata" +) + +func collect(opts options) error { + b, err := os.ReadFile(fmt.Sprintf("%s/%s", opts.Directory, opts.metadataFile)) + if err != nil { + return err + } + var md metadata.Metadata + if err := json.Unmarshal(b, &md); err != nil { + return err + } + + ctx, cancel := context.WithCancel(context.Background()) + defer cancel() + + var wg sync.WaitGroup + defer wg.Wait() + + go func() { + wg.Add(1) + defer wg.Done() + + sigs := make(chan os.Signal, 1) + defer close(sigs) + + signal.Notify(sigs, syscall.SIGINT, syscall.SIGTERM) + select { + case <-sigs: + fmt.Fprintf(os.Stderr, "INFO: received shutdown signal, please wait...\n") + cancel() + case <-ctx.Done(): + } + }() + + for _, log := range utils.Logs(md) { + go func(log metadata.Log) { + wg.Add(1) + defer wg.Done() + + chunks := make(chan *chunk.Chunk) + defer close(chunks) + + id, _ := log.Key.ID() + th, err := readState(opts, id[:]) + if err != nil { + fmt.Fprintf(os.Stderr, "ERROR: %s: %v\n", *log.Description, err) + cancel() + return + } + sth, err := readSnapshot(opts, id[:]) + if err != nil { + fmt.Fprintf(os.Stderr, "ERROR: %s: %v\n", *log.Description, err) + cancel() + return + } + + cli, err := client.New(string(log.URL), &http.Client{}, jsonclient.Options{UserAgent: "wip2"}) + if err != nil { + fmt.Fprintf(os.Stderr, "ERROR: %s: %v\n", *log.Description, err) + cancel() + return + } + fetcher := scanner.NewFetcher(cli, &scanner.FetcherOptions{ + BatchSize: int(opts.batchSize), + StartIndex: th.TreeSize, + EndIndex: int64(sth.TreeSize), + ParallelFetch: int(opts.workersPerLog), + Continuous: false, + }) + + // + // Callback that puts downloaded certificates into a + // chunk that a single sequencer can verify and persist + // + callback := func(eb scanner.EntryBatch) { + leafHashes := [][sha256.Size]byte{} + for i := 0; i < len(eb.Entries); i++ { + leafHashes = append(leafHashes, merkle.HashLeafNode(eb.Entries[i].LeafInput)) + } + sans := []string{"example.com"} // TODO: fixme + chunks <- &chunk.Chunk{eb.Start, leafHashes, sans} + } + + // + // Sequencer that waits for sufficiently large chunks + // before verifying inclusion proofs and persisting an + // intermediate tree head (size and root hash) as well + // as the SANs that were observed up until that point. + // + go func() { + wg.Add(1) + defer wg.Done() + defer fmt.Fprintf(os.Stderr, "INFO: %s: shutdown sequencer\n", *log.Description) + + h := &chunk.ChunkHeap{} + heap.Init(h) + curr := th.TreeSize + for { + select { + case <-ctx.Done(): + if h.Sequence(curr) { + c := h.TPop() + if _, err := persistChunk(cli, opts, id[:], 0, c); err != nil { + fmt.Fprintf(os.Stderr, "ERROR: %s: %v\n", err) + } + } + return + case c, ok := <-chunks: + if ok { + h.TPush(c) + } + if !h.Sequence(curr) { + continue + } + + c = h.TPop() + putBack, err := persistChunk(cli, opts, id[:], int64(opts.persistSize), c) + if err != nil { + cancel() + fmt.Fprintf(os.Stderr, "ERROR: %s: %v\n", *log.Description, err) + return + } + if putBack { + h.TPush(c) + continue + } + + curr += int64(len(c.LeafHashes)) + } + } + }() + + if err := fetcher.Run(ctx, callback); err != nil { + fmt.Fprintf(os.Stderr, "ERROR: %s: %v\n", *log.Description, err) + cancel() + return + } + + fmt.Fprintf(os.Stderr, "INFO: %s: fetch completed\n", *log.Description) + for len(chunks) > 0 { + select { + case <-ctx.Done(): + return + case <-time.After(1 * time.Second): + fmt.Fprintf(os.Stderr, "DEBUG: %s: waiting for chunks to be consumed\n", *log.Description) + } + } + }(log) + break + } + + time.Sleep(1 * time.Second) + return fmt.Errorf("TODO") +} + +type treeHead struct { + TreeSize int64 `json:"tree_size"` + RootHash [sha256.Size]byte `json:root_hash"` +} + +func readState(opts options, logID []byte) (treeHead, error) { + if _, err := os.Stat(fmt.Sprintf("%s/%x/%s", opts.logDirectory, logID, opts.stateFile)); err != nil { + return treeHead{0, sha256.Sum256(nil)}, nil + } + b, err := os.ReadFile(fmt.Sprintf("%s/%x/%s", opts.logDirectory, logID, opts.stateFile)) + if err != nil { + return treeHead{}, err + } + var th treeHead + if err := json.Unmarshal(b, &th); err != nil { + return treeHead{}, err + } + return th, nil +} + +func readSnapshot(opts options, logID []byte) (ct.SignedTreeHead, error) { + b, err := os.ReadFile(fmt.Sprintf("%s/%x/%s", opts.logDirectory, logID, opts.sthFile)) + if err != nil { + return ct.SignedTreeHead{}, err + } + var sth ct.SignedTreeHead + if err := json.Unmarshal(b, &sth); err != nil { + return ct.SignedTreeHead{}, err + } + return sth, nil +} + +func persistChunk(cli *client.LogClient, opts options, logID []byte, minSequence int64, c *chunk.Chunk) (bool, error) { + if len(c.LeafHashes) == 0 { + return false, nil // nothing to persist + } + if int64(len(c.LeafHashes)) < minSequence { + return true, nil // wait for more leaves + } + + // Read persisted tree state from disk + th, err := readState(opts, logID) + if err != nil { + return false, err + } + if th.TreeSize != c.Start { + return false, fmt.Errorf("disk state says next index is %d, in-memory says %d", th.TreeSize, c.Start) + } + + // Derive next intermediate tree state to persist + // + // Independent context because we need to run inclusion and consistency + // queries after the parent context is cancelled to persist on shutdown + // + ctx, cancel := context.WithCancel(context.Background()) + defer cancel() + p, err := cli.GetProofByHash(ctx, c.LeafHashes[0][:], uint64(c.Start+int64(len(c.LeafHashes)))) + if err != nil { + fmt.Fprintf(os.Stderr, "WARNING: %x: %v\n", logID, err) + return true, nil // try again later + } + if p.LeafIndex != c.Start { + return false, fmt.Errorf("log says proof for entry %d is at index %d", c.Start, p.LeafIndex) + } + // TODO: ranged inclusion verify + consistency proof + + // Persist SANs to disk + fp, err := os.OpenFile(fmt.Sprintf("%s/%x/%s", opts.logDirectory, logID, opts.sansFile), os.O_CREATE|os.O_APPEND|os.O_WRONLY, 0644) + if err != nil { + return false, err + } + defer fp.Close() + if _, err := fp.WriteString(strings.Join(c.SANs, "\n") + "\n"); err != nil { + return false, err + } + if err := fp.Sync(); err != nil { + return false, err + } + + // Persist intermediate log state to disk + b, err := json.Marshal(&treeHead{c.Start + int64(len(c.LeafHashes)), [sha256.Size]byte{}}) + if err != nil { + return false, err + } + if err := os.WriteFile(fmt.Sprintf("%s/%x/%s", opts.logDirectory, logID, opts.stateFile), b, 0644); err != nil { + return false, err + } + + fmt.Fprintf(os.Stderr, "DEBUG: %x: persist: start=%d end=%d\n", logID, c.Start, c.Start+int64(len(c.LeafHashes))) + return false, nil +} @@ -4,10 +4,14 @@ go 1.19 require ( github.com/go-logr/logr v1.2.0 // indirect + github.com/golang/protobuf v1.5.2 // indirect github.com/google/certificate-transparency-go v1.1.4 // indirect + github.com/google/trillian v1.5.1-0.20220819043421-0a389c4bb8d9 // indirect gitlab.torproject.org/rgdd/ct v0.0.0-20230115071200-fa4d0bcd1cab // indirect golang.org/x/crypto v0.0.0-20220411220226-7b82a4e95df4 // indirect golang.org/x/net v0.0.0-20220722155237-a158d28d115b // indirect + google.golang.org/genproto v0.0.0-20220706185917-7780775163c4 // indirect + google.golang.org/grpc v1.48.0 // indirect google.golang.org/protobuf v1.28.1 // indirect k8s.io/klog/v2 v2.80.1 // indirect ) @@ -1,18 +1,146 @@ +cloud.google.com/go v0.26.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw= +cloud.google.com/go v0.34.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw= +github.com/BurntSushi/toml v0.3.1/go.mod h1:xHWCNGjB5oqiDr8zfno3MHue2Ht5sIBksp03qcyfWMU= +github.com/antihax/optional v1.0.0/go.mod h1:uupD/76wgC+ih3iEmQUL+0Ugr19nfwCT1kdvxnR2qWY= +github.com/census-instrumentation/opencensus-proto v0.2.1/go.mod h1:f6KPmirojxKA12rnyqOA5BBL4O983OfeGPqjHWSTneU= +github.com/cespare/xxhash/v2 v2.1.1/go.mod h1:VGX0DQ3Q6kWi7AoAeZDth3/j3BFtOZR5XLFGgcrjCOs= +github.com/client9/misspell v0.3.4/go.mod h1:qj6jICC3Q7zFZvVWo7KLAzC3yx5G7kyvSDkc90ppPyw= +github.com/cncf/udpa/go v0.0.0-20191209042840-269d4d468f6f/go.mod h1:M8M6+tZqaGXZJjfX53e64911xZQV5JYwmTeXPW+k8Sc= +github.com/cncf/udpa/go v0.0.0-20201120205902-5459f2c99403/go.mod h1:WmhPx2Nbnhtbo57+VJT5O0JRkEi1Wbu0z5j0R8u5Hbk= +github.com/cncf/udpa/go v0.0.0-20210930031921-04548b0d99d4/go.mod h1:6pvJx4me5XPnfI9Z40ddWsdw2W/uZgQLFXToKeRcDiI= +github.com/cncf/xds/go v0.0.0-20210922020428-25de7278fc84/go.mod h1:eXthEFrGJvWHgFFCl3hGmgk+/aYT6PnTQLykKQRLhEs= +github.com/cncf/xds/go v0.0.0-20211001041855-01bcc9b48dfe/go.mod h1:eXthEFrGJvWHgFFCl3hGmgk+/aYT6PnTQLykKQRLhEs= +github.com/cncf/xds/go v0.0.0-20211011173535-cb28da3451f1/go.mod h1:eXthEFrGJvWHgFFCl3hGmgk+/aYT6PnTQLykKQRLhEs= +github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38= +github.com/envoyproxy/go-control-plane v0.9.0/go.mod h1:YTl/9mNaCwkRvm6d1a2C3ymFceY/DCBVvsKhRF0iEA4= +github.com/envoyproxy/go-control-plane v0.9.1-0.20191026205805-5f8ba28d4473/go.mod h1:YTl/9mNaCwkRvm6d1a2C3ymFceY/DCBVvsKhRF0iEA4= +github.com/envoyproxy/go-control-plane v0.9.4/go.mod h1:6rpuAdCZL397s3pYoYcLgu1mIlRU8Am5FuJP05cCM98= +github.com/envoyproxy/go-control-plane v0.9.9-0.20201210154907-fd9021fe5dad/go.mod h1:cXg6YxExXjJnVBQHBLXeUAgxn2UodCpnH306RInaBQk= 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k8s.io/klog/v2 v2.80.1 h1:atnLQ121W371wYYFawwYx1aEY2eUfs4l3J72wtgAwV4= k8s.io/klog/v2 v2.80.1/go.mod h1:y1WjHnz7Dj687irZUWR/WLkLc5N1YHtjLdmgWjndZn0= @@ -51,6 +51,10 @@ type options struct { sthFile string stateFile string sansFile string + + workersPerLog uint64 + batchSize uint64 + persistSize uint64 } func main() { @@ -82,13 +86,17 @@ func main() { opts.stateFile = "th.json" opts.sansFile = "sans.lst" + opts.workersPerLog = 10 + opts.batchSize = 16384 + opts.persistSize = 256 + // Hand-over to the respective subcommands var err error switch cmd := os.Args[1]; cmd { case "snapshot": err = snapshot(opts) - //case "collect": - // err = collect(opts) + case "collect": + err = collect(opts) case "assemble": err = assemble(opts) default: |