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// Copyright 2022 Google LLC. All Rights Reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
// Package cmd implements subcommands of ctclient, the command-line utility for
// interacting with CT logs.
package cmd
import (
"context"
"crypto/tls"
"flag"
"fmt"
"net/http"
"os"
"strings"
"time"
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/loglist3"
"github.com/google/certificate-transparency-go/x509util"
"github.com/spf13/cobra"
"github.com/spf13/pflag"
"k8s.io/klog/v2"
)
const connectionFlags = "{--log_uri uri | --log_name name [--log_list {file|uri}]} [--pub_key file]"
var (
skipHTTPSVerify bool
logName string
logList string
logURI string
pubKey string
)
func init() {
// Add flags added with "flag" package, including klog, to Cobra flag set.
pflag.CommandLine.AddGoFlagSet(flag.CommandLine)
flags := rootCmd.PersistentFlags()
flags.BoolVar(&skipHTTPSVerify, "skip_https_verify", false, "Skip verification of HTTPS transport connection")
flags.StringVar(&logName, "log_name", "", "Name of log to retrieve information from --log_list for")
flags.StringVar(&logList, "log_list", loglist3.AllLogListURL, "Location of master log list (URL or filename)")
flags.StringVar(&logURI, "log_uri", "https://ct.googleapis.com/rocketeer", "CT log base URI")
flags.StringVar(&pubKey, "pub_key", "", "Name of file containing log's public key")
}
// rootCmd represents the base command when called without any subcommands.
var rootCmd = &cobra.Command{
Use: "ctclient",
Short: "A command line client for Certificate Transparency logs",
PersistentPreRun: func(cmd *cobra.Command, _ []string) {
flag.Parse()
},
}
// Execute adds all child commands to the root command and sets flags
// appropriately. It needs to be called exactly once by main().
func Execute() {
if err := rootCmd.Execute(); err != nil {
klog.Fatal(err)
}
}
func signatureToString(signed *ct.DigitallySigned) string {
return fmt.Sprintf("Signature: Hash=%v Sign=%v Value=%x", signed.Algorithm.Hash, signed.Algorithm.Signature, signed.Signature)
}
func exitWithDetails(err error) {
if err, ok := err.(client.RspError); ok {
klog.Infof("HTTP details: status=%d, body:\n%s", err.StatusCode, err.Body)
}
klog.Exit(err.Error())
}
func connect(ctx context.Context) *client.LogClient {
var tlsCfg *tls.Config
if skipHTTPSVerify {
klog.Warning("Skipping HTTPS connection verification")
tlsCfg = &tls.Config{InsecureSkipVerify: skipHTTPSVerify}
}
httpClient := &http.Client{
Timeout: 10 * time.Second,
Transport: &http.Transport{
TLSHandshakeTimeout: 30 * time.Second,
ResponseHeaderTimeout: 30 * time.Second,
MaxIdleConnsPerHost: 10,
DisableKeepAlives: false,
MaxIdleConns: 100,
IdleConnTimeout: 90 * time.Second,
ExpectContinueTimeout: 1 * time.Second,
TLSClientConfig: tlsCfg,
},
}
opts := jsonclient.Options{UserAgent: "ct-go-ctclient/1.0"}
if pubKey != "" {
pubkey, err := os.ReadFile(pubKey)
if err != nil {
klog.Exit(err)
}
opts.PublicKey = string(pubkey)
}
uri := logURI
if logName != "" {
llData, err := x509util.ReadFileOrURL(logList, httpClient)
if err != nil {
klog.Exitf("Failed to read log list: %v", err)
}
ll, err := loglist3.NewFromJSON(llData)
if err != nil {
klog.Exitf("Failed to build log list: %v", err)
}
logs := ll.FindLogByName(logName)
if len(logs) == 0 {
klog.Exitf("No log with name like %q found in loglist %q", logName, logList)
}
if len(logs) > 1 {
logNames := make([]string, len(logs))
for i, log := range logs {
logNames[i] = fmt.Sprintf("%q", log.Description)
}
klog.Exitf("Multiple logs with name like %q found in loglist: %s", logName, strings.Join(logNames, ","))
}
uri = logs[0].URL
if opts.PublicKey == "" {
opts.PublicKeyDER = logs[0].Key
}
}
klog.V(1).Infof("Use CT log at %s", uri)
logClient, err := client.New(uri, httpClient, opts)
if err != nil {
klog.Exit(err)
}
return logClient
}
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