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package main
import (
"context"
"errors"
"flag"
"fmt"
"log"
"os"
"os/signal"
"strings"
"sync"
"syscall"
"time"
"rgdd.se/silent-ct/internal/feedback"
"rgdd.se/silent-ct/internal/flagopt"
"rgdd.se/silent-ct/internal/ioutil"
"rgdd.se/silent-ct/internal/logger"
"rgdd.se/silent-ct/internal/manager"
"rgdd.se/silent-ct/internal/monitor"
"rgdd.se/silent-ct/pkg/policy"
)
const usage = `
silentct-mon is a tool that monitors Certificate Transparency logs. The tool
can operate silently, which means there need not be any output unless a
certificate is possibly mis-issued. This requires use of the silentct-mac
utility on the trusted systems that legitimately request certificates.
The same list of Certificate Transparency logs as Google Chrome is used. This
list can be overridden in the silentct-mon configuration file.
Usage: silentct-mon [Options] -d DIRECTORY -f POLICY-FILE
Options:
-b, --bootstrap Initializes a new state directory (Default: false)
-c, --contact A string that helps log operators know who you are (Default: "")
-d, --directory Path to a directory where all state will be stored
-w, --num-workers Number of parallel workers to fetch each log with (Default: 1)
-o, --output-file File that all output will be written to (Default: stdout)
-e, --please-exit Toggle to only run until up-to-date (Default: false)
-f, --policy-file Path to the monitor's policy file in JSON format
-p, --pull-interval How often nodes are pulled for certificates (Default: 15m)
-v, --verbosity Leveled logging output (default: NOTICE)
`
type config struct {
// Options
verbosity string
bootstrap bool
contact string
directory string
pleaseExit bool
policyFile string
outputFile string
pullInterval time.Duration
numWorkers uint
// Extracted
log *logger.Logger
policy policy.Policy
}
func configure(cmd string, args []string) (cfg config, err error) {
fs := flag.NewFlagSet(cmd, flag.ContinueOnError)
fs.Usage = func() {}
flagopt.BoolOpt(fs, &cfg.bootstrap, "bootstrap", "b", false)
flagopt.StringOpt(fs, &cfg.contact, "contact", "c", "")
flagopt.StringOpt(fs, &cfg.directory, "directory", "d", "")
flagopt.UintOpt(fs, &cfg.numWorkers, "num-workers", "w", 1)
flagopt.StringOpt(fs, &cfg.outputFile, "output-file", "o", "")
flagopt.BoolOpt(fs, &cfg.pleaseExit, "please-exit", "e", false)
flagopt.StringOpt(fs, &cfg.policyFile, "policy-file", "f", "")
flagopt.DurationOpt(fs, &cfg.pullInterval, "pull-interval", "p", 15*time.Minute)
flagopt.StringOpt(fs, &cfg.verbosity, "verbosity", "v", logger.LevelNotice.String())
if err = fs.Parse(args); err != nil {
return cfg, err
}
// Options
if cfg.directory == "" {
return cfg, fmt.Errorf("directory is a required option")
}
if cfg.numWorkers == 0 || cfg.numWorkers >= 4 {
return cfg, fmt.Errorf("number of workers must be in [1, 4)")
}
output := os.Stdout
if cfg.outputFile != "" {
if output, err = os.OpenFile(cfg.outputFile, os.O_WRONLY|os.O_CREATE|os.O_APPEND, 0644); err != nil {
return cfg, fmt.Errorf("failed to open output file: %v", err)
}
}
if cfg.policyFile == "" {
return cfg, fmt.Errorf("policy file is a required option")
}
if err := ioutil.ReadJSON(cfg.policyFile, &cfg.policy); err != nil {
return cfg, err
}
if len(cfg.policy.Monitor) == 0 {
return cfg, fmt.Errorf("policy: need at least one wildcard to monitor")
}
lv, err := logger.NewLevel(cfg.verbosity)
if err != nil {
return cfg, fmt.Errorf("invalid verbosity: %v", err)
}
cfg.log = logger.New(logger.Config{Level: lv, File: output})
// Arguments
if len(fs.Args()) != 0 {
return cfg, fmt.Errorf("trailing arguments are not permitted")
}
return cfg, nil
}
func main() {
cfg, err := configure(os.Args[0], os.Args[1:])
if err != nil {
if errors.Is(err, flag.ErrHelp) {
fmt.Fprintf(os.Stdout, "%s", usage[1:])
os.Exit(0)
}
if !strings.Contains(err.Error(), "flag provided but not defined") {
fmt.Fprintf(os.Stdout, "%v\n", err)
}
os.Exit(1)
}
feventCh := make(chan []feedback.Event)
defer close(feventCh)
mconfigCh := make(chan monitor.MonitoredLog)
defer close(mconfigCh)
meventCh := make(chan monitor.Event)
defer close(meventCh)
errorCh := make(chan error)
defer close(errorCh)
mgr, err := manager.New(manager.Config{
Policy: cfg.policy,
Bootstrap: cfg.bootstrap,
Directory: cfg.directory,
Logger: cfg.log,
AlertDelay: cfg.pullInterval * 3 / 2,
}, feventCh, meventCh, mconfigCh, errorCh)
if err != nil {
cfg.log.Dief("manager: %v\n", err)
}
mon, err := monitor.New(monitor.Config{
Matcher: &cfg.policy.Monitor,
Logger: cfg.log,
Contact: cfg.contact,
NumWorkers: cfg.numWorkers,
}, meventCh, mconfigCh, errorCh)
if err != nil {
cfg.log.Dief("monitor: %v\n", err)
}
fb, err := feedback.New(feedback.Config{
Policy: cfg.policy,
Logger: cfg.log,
PullInterval: cfg.pullInterval,
}, feventCh)
if err != nil {
cfg.log.Dief("feedback: %v\n", err)
}
if cfg.bootstrap {
os.Exit(0)
}
if cfg.pleaseExit {
cfg.log.Dief("the --please-exit option is not supported yet\n")
}
var wg sync.WaitGroup
ctx, cancel := context.WithCancel(context.Background())
wg.Add(1)
go func() {
defer wg.Done()
defer cancel()
await(ctx)
}()
wg.Add(1)
go func() {
defer wg.Done()
defer cancel()
mon.RunForever(ctx)
}()
wg.Add(1)
go func() {
defer wg.Done()
defer cancel()
fb.RunForever(ctx)
}()
os.Exit(func() int {
defer wg.Wait()
defer cancel()
if err := mgr.Run(ctx); err != nil {
log.Fatalf("manager: %v\n", err)
return 1
}
return 0
}())
}
func await(ctx context.Context) {
sigs := make(chan os.Signal, 1)
defer close(sigs)
signal.Notify(sigs, syscall.SIGINT, syscall.SIGTERM)
select {
case <-sigs:
case <-ctx.Done():
}
}
|
