| // Copyright 2019 The Go Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style |
| // license that can be found in the LICENSE file. |
| |
| // Notecheck checks a go.sum file against a notary. |
| // |
| // WARNING! This program is meant as a proof of concept demo and |
| // should not be used in production scripts. |
| // It does not set an exit status to report whether the |
| // checksums matched, and it does not filter the go.sum |
| // according to the $GONOVERIFY environment variable. |
| // |
| // Usage: |
| // |
| // notecheck [-v] notary-key go.sum |
| // |
| // The -v flag enables verbose output. |
| // |
| package main |
| |
| import ( |
| "bytes" |
| "encoding/hex" |
| "flag" |
| "fmt" |
| "io/ioutil" |
| "log" |
| "net/http" |
| "os" |
| "strconv" |
| "strings" |
| "sync" |
| "time" |
| |
| "golang.org/x/exp/notary/internal/note" |
| "golang.org/x/exp/notary/internal/tlog" |
| ) |
| |
| func usage() { |
| fmt.Fprintf(os.Stderr, "usage: notecheck [-u url] [-h H] [-v] notary-key go.sum...\n") |
| os.Exit(2) |
| } |
| |
| var height = flag.Int("h", 2, "tile height") |
| var vflag = flag.Bool("v", false, "enable verbose output") |
| var url = flag.String("u", "", "url to notary (overriding name)") |
| |
| func main() { |
| log.SetPrefix("notecheck: ") |
| log.SetFlags(0) |
| |
| flag.Usage = usage |
| flag.Parse() |
| if flag.NArg() < 2 { |
| usage() |
| } |
| |
| vkey := flag.Arg(0) |
| verifier, err := note.NewVerifier(vkey) |
| if err != nil { |
| log.Fatal(err) |
| } |
| if *url == "" { |
| *url = "https://" + verifier.Name() |
| } |
| msg, err := httpGet(*url + "/latest") |
| if err != nil { |
| log.Fatal(err) |
| } |
| treeNote, err := note.Open(msg, note.NotaryList(verifier)) |
| if err != nil { |
| log.Fatalf("reading note: %v\nnote:\n%s", err, msg) |
| } |
| tree, err := tlog.ParseTree([]byte(treeNote.Text)) |
| if err != nil { |
| log.Fatal(err) |
| } |
| |
| if *vflag { |
| log.Printf("validating against %s @%d", verifier.Name(), tree.N) |
| } |
| |
| verifierURL := *url |
| tr := &tileReader{url: verifierURL + "/"} |
| thr := tlog.TileHashReader(tree, tr) |
| if _, err := tlog.TreeHash(tree.N, thr); err != nil { |
| log.Fatal(err) |
| } |
| |
| for _, arg := range flag.Args()[1:] { |
| data, err := ioutil.ReadFile(arg) |
| if err != nil { |
| log.Fatal(err) |
| } |
| log.SetPrefix("notecheck: " + arg + ": ") |
| checkGoSum(data, verifierURL, thr) |
| log.SetPrefix("notecheck: ") |
| } |
| } |
| |
| func checkGoSum(data []byte, verifierURL string, thr tlog.HashReader) { |
| lines := strings.SplitAfter(string(data), "\n") |
| if lines[len(lines)-1] != "" { |
| log.Printf("error: final line missing newline") |
| return |
| } |
| lines = lines[:len(lines)-1] |
| if len(lines)%2 != 0 { |
| log.Printf("error: odd number of lines") |
| } |
| for i := 0; i+2 <= len(lines); i += 2 { |
| f1 := strings.Fields(lines[i]) |
| f2 := strings.Fields(lines[i+1]) |
| if len(f1) != 3 || len(f2) != 3 || f1[0] != f2[0] || f1[1]+"/go.mod" != f2[1] { |
| log.Printf("error: bad line pair:\n\t%s\t%s", lines[i], lines[i+1]) |
| continue |
| } |
| |
| data, err := httpGet(verifierURL + "/lookup/" + f1[0] + "@" + f1[1]) |
| if err != nil { |
| log.Printf("%s@%s: %v", f1[0], f1[1], err) |
| continue |
| } |
| j := bytes.IndexByte(data, '\n') |
| if j < 0 { |
| log.Printf("%s@%s: short response from lookup", f1[0], f1[1]) |
| continue |
| } |
| id, err := strconv.ParseInt(strings.TrimSpace(string(data[:j])), 10, 64) |
| if err != nil { |
| log.Printf("%s@%s: unexpected response:\n%s", f1[0], f1[1], data) |
| continue |
| } |
| ldata := data[j+1:] |
| |
| c := make(chan *tlog.Hash, 1) |
| go func() { |
| hashes, err := thr.ReadHashes([]int64{tlog.StoredHashIndex(0, id)}) |
| if err != nil { |
| log.Printf("%s@%s: %v", f1[0], f1[1], err) |
| c <- nil |
| return |
| } |
| c <- &hashes[0] |
| }() |
| |
| // The record lookup can be skipped in favor of using the /lookup response |
| // but we fetch record and test that they match, to check the server. |
| data, err = httpGet(verifierURL + "/record/" + fmt.Sprint(id)) |
| if err != nil { |
| log.Printf("%s@%s: %v", f1[0], f1[1], err) |
| continue |
| } |
| if !bytes.Equal(data, ldata) { |
| log.Printf("%s@%s: different data from lookup and record:\n%s\n%s", f1[0], f1[1], hex.Dump(ldata), hex.Dump(data)) |
| continue |
| } |
| |
| hash := tlog.RecordHash(data) |
| hash1 := <-c |
| if hash1 == nil { |
| continue |
| } |
| if *hash1 != hash { |
| log.Printf("%s@%s: inconsistent records on notary!", f1[0], f1[1]) |
| continue |
| } |
| if string(data) != lines[i]+lines[i+1] { |
| log.Printf("%s@%s: invalid go.sum entries:\nhave:\n\t%s\t%swant:\n\t%s", f1[0], f1[1], lines[i], lines[i+1], strings.Replace(string(data), "\n", "\n\t", -1)) |
| } |
| } |
| } |
| |
| func init() { |
| http.DefaultClient.Timeout = 10 * time.Second |
| } |
| |
| func httpGet(url string) ([]byte, error) { |
| start := time.Now() |
| resp, err := http.Get(url) |
| if err != nil { |
| return nil, err |
| } |
| defer resp.Body.Close() |
| if resp.StatusCode != 200 { |
| return nil, fmt.Errorf("GET %v: %v", url, resp.Status) |
| } |
| data, err := ioutil.ReadAll(resp.Body) |
| if err != nil { |
| return nil, err |
| } |
| if *vflag { |
| fmt.Fprintf(os.Stderr, "%.3fs %s\n", time.Since(start).Seconds(), url) |
| } |
| return data, nil |
| } |
| |
| type tileReader struct { |
| url string |
| cache map[tlog.Tile][]byte |
| cacheMu sync.Mutex |
| } |
| |
| func (r *tileReader) Height() int { |
| return *height |
| } |
| |
| func (r *tileReader) Reject(tile tlog.Tile) { |
| log.Printf("tile rejected: %v", tile.Path()) |
| } |
| |
| // TODO(rsc): Move some variant of this to package tlog |
| // once we are more sure of the API. |
| |
| func (r *tileReader) ReadTiles(tiles []tlog.Tile) ([][]byte, error) { |
| var wg sync.WaitGroup |
| out := make([][]byte, len(tiles)) |
| errs := make([]error, len(tiles)) |
| r.cacheMu.Lock() |
| if r.cache == nil { |
| r.cache = make(map[tlog.Tile][]byte) |
| } |
| for i, tile := range tiles { |
| if data := r.cache[tile]; data != nil { |
| out[i] = data |
| continue |
| } |
| wg.Add(1) |
| go func(i int, tile tlog.Tile) { |
| defer wg.Done() |
| data, err := httpGet(r.url + tile.Path()) |
| if err != nil && tile.W != 1<<uint(tile.H) { |
| fullTile := tile |
| fullTile.W = 1 << uint(tile.H) |
| if fullData, err1 := httpGet(r.url + fullTile.Path()); err1 == nil { |
| data = fullData[:tile.W*tlog.HashSize] |
| err = nil |
| } |
| } |
| if err != nil { |
| errs[i] = err |
| return |
| } |
| r.cacheMu.Lock() |
| r.cache[tile] = data |
| r.cacheMu.Unlock() |
| out[i] = data |
| }(i, tile) |
| } |
| r.cacheMu.Unlock() |
| wg.Wait() |
| |
| for _, err := range errs { |
| if err != nil { |
| return nil, err |
| } |
| } |
| |
| return out, nil |
| } |