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"fmt"
"io/ioutil"
"log"
"net/http"
"os"
"path/filepath"
"github.com/docopt/docopt-go"
"github.com/go-ini/ini"
"github.com/tidwall/gjson"
)
var (
appVersion string
buildTime string
CertBase string
KeyBase string
GroupName string
RedisBaseURL string
VaultBaseURL string
certificateDestination string
fullchainDestination string
keyDestination string
caDestination string
Type string
)
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// check certificates
func checkCerificates(dnsname string, certificate string, fullchain string, ca string, key string, days int, fail bool) bool {
Seconds := days * 86400
daysNumber := time.Now().Local().Add(time.Second * time.Duration(Seconds))
//fmt.Printf(daysNumber)
certPEM, err := ioutil.ReadFile(certificate)
if err != nil {
if fail == true {
log.Fatal(err)
} else {
return false
}
}
certFullchainPEM, err := ioutil.ReadFile(fullchain)
if err != nil {
if fail == true {
log.Fatal(err)
} else {
return false
}
}
rootPEM, err := ioutil.ReadFile(ca)
if err != nil {
if fail == true {
log.Fatal(err)
} else {
return false
}
}
roots := x509.NewCertPool()
ok := roots.AppendCertsFromPEM([]byte(rootPEM))
if !ok {
if fail == true {
panic("failed to parse root certificate")
} else {
return false
}
}
block, _ := pem.Decode([]byte(certPEM))
if block == nil {
if fail == true {
panic("failed to parse certificate PEM")
} else {
return false
}
}
cert, err := x509.ParseCertificate(block.Bytes)
if err != nil {
if fail == true {
panic("failed to parse certificate: " + err.Error())
} else {
return false
}
}
fullchainBlock, _ := pem.Decode([]byte(certFullchainPEM))
if fullchainBlock == nil {
if fail == true {
panic("failed to parse certificate PEM")
} else {
return false
}
}
fullchainCert, fullchainErr := x509.ParseCertificate(fullchainBlock.Bytes)
if fullchainErr != nil {
if fail == true {
panic("failed to parse certificate: " + fullchainErr.Error())
} else {
return false
}
}
opts := x509.VerifyOptions{
Roots: roots,
DNSName: dnsname,
CurrentTime: daysNumber,
Intermediates: x509.NewCertPool(),
}
if _, err := cert.Verify(opts); err != nil {
if fail == true {
panic("failed to verify certificate: " + err.Error())
} else {
return false
}
}
if _, fullchainErr := fullchainCert.Verify(opts); fullchainErr != nil {
if fail == true {
panic("failed to verify certificate: " + fullchainErr.Error())
} else {
return false
}
}
return true
}
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// get redis key
func GetRedisKey(redisurl string, redistoken string) string {
client := &http.Client{}
req, err := http.NewRequest("GET", redisurl, nil)
req.SetBasicAuth("redis", redistoken)
resp, err := client.Do(req)
body, err := ioutil.ReadAll(resp.Body)
defer resp.Body.Close()
if err != nil {
log.Fatalf("[ERROR] Fail to read %v: %v", redisurl, err)
}
return fmt.Sprintf(string(body))
}
// create directory structure and write certificate to file
func WriteToFile(content string, destination string, groupname string, filemode os.FileMode, dirmode os.FileMode) {
baseDir := filepath.Dir(destination)
if _, err := os.Stat(baseDir); os.IsNotExist(err) {
os.MkdirAll(baseDir, 0755)
}
os.Chmod(baseDir, dirmode)
file, err := os.OpenFile(destination, os.O_WRONLY|os.O_CREATE, filemode)
if err != nil {
log.Fatalf("[ERROR] %v cannot be created", destination)
}
fmt.Fprintf(file, "%v\n", content)
file.Close()
}
// ReadOSRelease from /etc/os-release
func ReadOSRelease(configfile string) map[string]string {
cfg, err := ini.Load(configfile)
if err != nil {
log.Fatal("[ERROR] Fail to read file: ", err)
}
ConfigParams := make(map[string]string)
ConfigParams["ID"] = cfg.Section("").Key("ID").String()
return ConfigParams
}
func main() {
OSInfo := ReadOSRelease("/etc/os-release")
OSRelease := OSInfo["ID"]
if OSRelease == "centos" || OSRelease == "rhel" {
CertBase = "/etc/pki/tls/certs"
KeyBase = "/etc/pki/tls/private"
GroupName = "root"
} else if OSRelease == "ubuntu" || OSRelease == "debian" {
CertBase = "/etc/ssl/certs"
KeyBase = "/etc/ssl/private"
GroupName = "ssl-cert"
} else if OSRelease == "arch" {
CertBase = "/etc/ssl/certs"
KeyBase = "/etc/ssl/private"
GroupName = "root"
} else {
log.Fatalf("don't know what to do with OS: %v", OSRelease)
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}
usage := fmt.Sprintf(`ACME Downloader:
- fetches and stores a given Certificate, Full Chain, CA and Private Key
Usage:
acme-downloader --redis-token=REDISTOKEN --vault-token=VAULTTOKEN --cert-name=CERTNAME --team-name=TEAMNAME [--days=DAYS] [--type=TYPE] [--cert-destination=CERTDESTINATION] [--fullchain-destination=FULLCHAINDESTINATION] [--key-destination=KEYDESTINATION] [--ca-destination=CADESTINATION]
acme-downloader -v | --version
acme-downloader -b | --build
acme-downloader -h | --help
Options:
-h --help Show this screen
-v --version Print version exit
-b --build Print version and build information and exit
--redis-token=REDISTOKEN Redis access token
--vault-token=VAULTTOKEN Vault access token
--cert-name=CERTNAME Certificate name
--team-name=TEAMNAME Team name: swd, dream_team, it, ne, ti...
--days=DAYS Days before expiration [default: 30]
--type=TYPE Type, EV or OV [default: EV]
--cert-destination=CERTDESTINATION Cert Destination [default: %v/<cert-name>.crt]
--fullchain-destination=FULLCHAINDESTINATION Full Chain Destination[default: %v/<cert-name>_fullchain.crt]
--key-destination=KEYDESTINATION Key Destination [default: %v/<cert-name>.key]
--ca-destination=CADESTINATION CA Destination [default: %v/COMODO_<type>.crt]
`, CertBase, CertBase, KeyBase, CertBase)
// Annoyingly docopt tries to use 'version' the way he wants and I am using build
arguments, _ := docopt.Parse(usage, nil, true, appVersion, false)
if arguments["--build"] == true {
fmt.Printf("acme-downloader version: %v, built on: %v\n", appVersion, buildTime)
os.Exit(0)
}
VaultToken := arguments["--vault-token"].(string)
CertName := arguments["--cert-name"].(string)
CertNameUndercored := strings.Replace(CertName, ".", "_", -1)
TeamName := arguments["--team-name"].(string)
RedisToken := arguments["--redis-token"].(string)
Type = arguments["--type"].(string)
DayString := arguments["--days"].(string)
Days, daysErr := strconv.Atoi(DayString)
if daysErr != nil {
log.Fatal("Days mut be an integer")
}
RedisBaseURL = "https://redis.geant.org/GET"
VaultBaseURL = "https://vault.geant.org/v1"
VaultURL := fmt.Sprintf("%v/%v/%v/vault_%v_key", VaultBaseURL, TeamName, CertName, CertNameUndercored)
RedisCertURL := fmt.Sprintf("%v/%v:%v:redis_%v_pem.txt", RedisBaseURL, TeamName, CertName, CertNameUndercored)
RedisCAURL := fmt.Sprintf("%v/%v:%v:redis_%v_chain_pem.txt", RedisBaseURL, TeamName, CertName, CertNameUndercored)
RedisFullChainURL := fmt.Sprintf("%v/%v:%v:redis_%v_fullchain_pem.txt", RedisBaseURL, TeamName, CertName, CertNameUndercored)
tmpCertificateDestination := "/tmp/amce_cert.pem"
tmpFullchainDestination := "/tmp/amce_fullchain.pem"
tmpCaDestination := "/tmp/amce_ca.pem"
tmpKeyDestination := "/tmp/amce_key.pem"
if arguments["--cert-destination"] == fmt.Sprintf("%v/<cert-name>.crt", CertBase) {
certificateDestination = fmt.Sprintf("%v/%v.crt", CertBase, CertName)
} else {
certificateDestination = arguments["--cert-destination"].(string)
}
if arguments["--fullchain-destination"] == fmt.Sprintf("%v/<cert-name>_fullchain.crt", CertBase) {
fullchainDestination = fmt.Sprintf("%v/%v_fullchain.crt", CertBase, CertName)
} else {
fullchainDestination = arguments["--fullchain-destination"].(string)
}
if arguments["--ca-destination"] == fmt.Sprintf("%v/COMODO_<type>.crt", CertBase) {
caDestination = fmt.Sprintf("%v/COMODO_%v.crt", CertBase, Type)
} else {
caDestination = arguments["--ca-destination"].(string)
}
if arguments["--key-destination"] == fmt.Sprintf("%v/<cert-name>.key", KeyBase) {
keyDestination = fmt.Sprintf("%v/%v.key", KeyBase, CertName)
} else {
keyDestination = arguments["--key-destination"].(string)
}
// checkCerificates(dnsname string, certificate string, fullchain string, ca string, key string, fail bool)
// check if there is a certificate installed and it is valid
existingCert := checkCerificates(CertName, certificateDestination, fullchainDestination, caDestination, keyDestination, Days, false)
if existingCert == true {
fmt.Printf("the certificates are still valid")
os.Exit(0)
certificate := GetRedisKey(RedisCertURL, RedisToken)
ca := GetRedisKey(RedisCAURL, RedisToken)
fullChain := GetRedisKey(RedisFullChainURL, RedisToken)
// get Vault key
vaultClient := &http.Client{}
vaultReq, err := http.NewRequest("GET", VaultURL, nil)
vaultReq.Header.Add("X-vault-token", VaultToken)
vaultResp, err := vaultClient.Do(vaultReq)
vaultBody, err := ioutil.ReadAll(vaultResp.Body)
defer vaultResp.Body.Close()
if err != nil {
log.Fatalf("Fail to read %v: %v", VaultURL, err)
}
privKey := gjson.Get(string(vaultBody), "data.value").String()
WriteToFile(certificate, tmpCertificateDestination, GroupName, 0644, 0755)
WriteToFile(fullChain, tmpFullchainDestination, GroupName, 0644, 0755)
WriteToFile(ca, tmpCaDestination, GroupName, 0644, 0755)
WriteToFile(privKey, tmpKeyDestination, GroupName, 0640, 0750)
newCert := checkCerificates(CertName, tmpCertificateDestination, tmpFullchainDestination, tmpCaDestination, tmpKeyDestination, Days, false)
if newCert == false {
log.Fatalf("the certificates are malformed. Skippping installation")
os.Exit(0)
}
WriteToFile(certificate, certificateDestination, GroupName, 0644, 0755)
WriteToFile(fullChain, fullchainDestination, GroupName, 0644, 0755)
WriteToFile(ca, caDestination, GroupName, 0644, 0755)
WriteToFile(privKey, keyDestination, GroupName, 0640, 0750)
fmt.Printf("installed: %v\n", certificateDestination)
fmt.Printf("installed: %v\n", caDestination)
fmt.Printf("installed: %v\n", fullchainDestination)
fmt.Printf("installed: %v\n", keyDestination)