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package main
import (
"bufio"
"bytes"
"encoding/json"
"errors"
"fmt"
logger "log"
"os"
"os/exec"
"strconv"
"time"
ct "github.com/google/certificate-transparency-go"
"gitlab.torproject.org/rgdd/ct/pkg/metadata"
)
func assemble(opts options) error {
now := time.Now()
metadataBytes, err := os.ReadFile(fmt.Sprintf("%s/%s", opts.Directory, opts.metadataFile))
if err != nil {
return err
}
var md metadata.Metadata
if err := json.Unmarshal(metadataBytes, &md); err != nil {
return err
}
var sanFiles []string
var noticeFiles []string
var sths []ct.SignedTreeHead
for _, log := range logs(md) {
id, _ := log.Key.ID()
th, err := readState(opts, id[:])
if err != nil {
return err
}
sth, err := readSnapshot(opts, id[:])
if err != nil {
return err
}
if uint64(th.TreeSize) != sth.TreeSize {
return fmt.Errorf("%s: at tree size %d, want %d", *log.Description, th.TreeSize, sth.TreeSize)
}
if th.RootHash != sth.SHA256RootHash {
return fmt.Errorf("%s: root hash mismatch")
}
sanFiles = append(sanFiles, fmt.Sprintf("%s/%x/%s", opts.logDirectory, id[:], opts.sansFile))
noticeFiles = append(noticeFiles, fmt.Sprintf("%s/%x/%s", opts.logDirectory, id[:], opts.noticeFile))
sths = append(sths, sth)
}
logger.Printf("INFO: merging and de-duplicating %d input files with GNU sort", len(sanFiles))
archiveDir := fmt.Sprintf("%s/%s-ct-sans", opts.archiveDirectory, now.Format("2006-01-02"))
if err := os.MkdirAll(archiveDir, os.ModePerm); err != nil {
return err
}
sansFile := fmt.Sprintf("%s/%s", archiveDir, opts.sansFile)
if err := dedup(opts, sansFile, sanFiles); err != nil {
return err
}
size, err := fileSize(sansFile)
if err != nil {
return err
}
logger.Printf("INFO: created %s (%s)", sansFile, size)
logger.Printf("INFO: adding notice file")
var notes []byte
for _, noticeFile := range noticeFiles {
b, err := os.ReadFile(noticeFile)
if errors.Is(err, os.ErrNotExist) {
continue // no notes, great
} else if err != nil {
return err
}
notes = append(notes, b...)
}
if err := os.WriteFile(fmt.Sprintf("%s/%s", archiveDir, opts.noticeFile), notes, 0644); err != nil {
return err
}
numNotes := len(bytes.Split(notes, []byte("\n"))) - 1
logger.Printf("INFO: adding README")
readme, err := makeREADME(opts, sths, numNotes, now)
if err != nil {
return err
}
if err := os.WriteFile(fmt.Sprintf("%s/README.md", archiveDir), []byte(readme), 0644); err != nil {
return err
}
logger.Printf("INFO: adding signed metadata file")
sigBytes, err := os.ReadFile(fmt.Sprintf("%s/%s", opts.Directory, opts.metadataSignatureFile))
if err != nil {
return err
}
if err := os.WriteFile(fmt.Sprintf("%s/%s", archiveDir, opts.metadataFile), metadataBytes, 0644); err != nil {
return err
}
if err := os.WriteFile(fmt.Sprintf("%s/%s", archiveDir, opts.metadataSignatureFile), sigBytes, 0644); err != nil {
return err
}
logger.Printf("INFO: adding signed tree heads")
sthsBytes, err := json.MarshalIndent(sths, "", "\t")
if err != nil {
return err
}
if err := os.WriteFile(fmt.Sprintf("%s/%s", archiveDir, opts.sthsFile), sthsBytes, 0644); err != nil {
return err
}
logger.Printf("INFO: uncompressed dataset available in %s", archiveDir)
return nil
}
func dedup(opts options, outputFile string, inputFiles []string) error {
cmd := exec.Command("sort", append([]string{
"-Vuo", outputFile,
"--buffer-size", fmt.Sprintf("%dG", opts.BufferSize),
"--temporary-directory", fmt.Sprintf("%s", opts.TempDir),
"--parallel", fmt.Sprintf("%d", opts.Parallel),
}, inputFiles...)...)
if errors.Is(cmd.Err, exec.ErrDot) {
cmd.Err = nil
}
stderr := bytes.NewBuffer(nil)
cmd.Stderr = stderr
if _, err := cmd.Output(); err != nil {
return fmt.Errorf("%s", string(stderr.Bytes()))
}
return nil
}
func makeREADME(opts options, sths []ct.SignedTreeHead, numNotes int, now time.Time) (string, error) {
snapshotTime, err := readSnapshotTime(opts)
if err != nil {
return "", err
}
return fmt.Sprintf(`# ct-sans dataset
Dataset assembled at %s. Contents:
- README.md
- %s
- %s
- %s
- %s
- %s
The signed [metadata file][] and tree heads were downloaded at
%s.
[metadata file]: https://groups.google.com/a/chromium.org/g/ct-policy/c/IdbrdAcDQto
In total, %d certificates were downloaded from %d CT logs;
%d certificates contained SANs that could not be parsed.
For more information about these errors, see %s.
The SANs data set is sorted and de-duplicated, one SAN per line.
`, now.Format(time.UnixDate), opts.metadataFile, opts.metadataSignatureFile, opts.sthsFile, opts.noticeFile, opts.sansFile,
snapshotTime.Format(time.UnixDate), numCertificates(sths), len(sths), numNotes, opts.noticeFile), nil
}
func fileSize(name string) (string, error) {
fi, err := os.Stat(name)
if err != nil {
return "", err
}
size := fmt.Sprintf("%.1f GiB", float64(fi.Size())/float64((1024*1024*1024)))
if fi.Size() < 1024*1024*1024 {
size = fmt.Sprintf("%.1f MiB", float64(fi.Size())/float64((1024*1024)))
}
return size, nil
}
func noticeReport(path string) (string, error) {
fp, err := os.OpenFile(path, os.O_RDONLY, 0644)
if err != nil {
return "", err
}
defer fp.Close()
scanner := bufio.NewScanner(fp)
num := 0
for scanner.Scan() {
_ = scanner.Text()
num += 1
}
return fmt.Sprintf("%d", num), nil
}
func numCertificates(sths []ct.SignedTreeHead) (sum uint64) {
for _, sth := range sths {
sum += sth.TreeSize
}
return
}
func readSnapshotTime(opts options) (time.Time, error) {
b, err := os.ReadFile(fmt.Sprintf("%s/%s", opts.Directory, opts.metadataTimestampFile))
if err != nil {
return time.Time{}, err
}
num, err := strconv.ParseInt(string(b), 10, 64)
if err != nil {
return time.Time{}, err
}
return time.Unix(num, 0), nil
}
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