// This function sends a DomainServiceRequest of the type GET_CRL to the domain service,
// and deserializes the response into a pkix.CertificateList containing the revoked certificates.
func RequestCrl(network, addr string) (*pkix.CertificateList, error) {
reqType := DomainServiceRequest_GET_CRL
request := &DomainServiceRequest{
Type: &reqType}
conn, err := net.Dial(network, addr)
if err != nil {
return nil, err
}
ms := util.NewMessageStream(conn)
_, err = ms.WriteMessage(request)
if err != nil {
return nil, err
}
log.Printf("Sent crl request to Domain Service using network %s at address %s.",
network, addr)
var response DomainServiceResponse
err = ms.ReadMessage(&response)
if err != nil {
return nil, err
}
log.Println("Got response from Domain Service.")
if errStr := response.GetErrorMessage(); errStr != "" {
return nil, errors.New(errStr)
}
parsedCrl, err := x509.ParseCRL(response.GetCrl())
return parsedCrl, err
}
func FuzzCRL(data []byte) int {
list, err := x509.ParseCRL(data)
if err != nil {
if list != nil {
panic("list is not nil on error")
}
return 0
}
return 1
}
// fetchCRL fetches and parses a CRL.
func fetchCRL(url string) (*pkix.CertificateList, error) {
resp, err := http.Get(url)
if err != nil {
return nil, err
} else if resp.StatusCode >= 300 {
return nil, errors.New("failed to retrieve CRL")
}
body, err := ioutil.ReadAll(resp.Body)
if err != nil {
return nil, err
}
resp.Body.Close()
return x509.ParseCRL(body)
}
func (b *backend) pathCRLWrite(
req *logical.Request, d *framework.FieldData) (*logical.Response, error) {
name := strings.ToLower(d.Get("name").(string))
if name == "" {
return logical.ErrorResponse(`"name" parameter cannot be empty`), nil
}
crl := d.Get("crl").(string)
certList, err := x509.ParseCRL([]byte(crl))
if err != nil {
return logical.ErrorResponse(fmt.Sprintf("failed to parse CRL: %v", err)), nil
}
if certList == nil {
return logical.ErrorResponse("parsed CRL is nil"), nil
}
b.crlUpdateMutex.Lock()
defer b.crlUpdateMutex.Unlock()
crlInfo := CRLInfo{
Serials: map[string]RevokedSerialInfo{},
}
for _, revokedCert := range certList.TBSCertList.RevokedCertificates {
crlInfo.Serials[revokedCert.SerialNumber.String()] = RevokedSerialInfo{}
}
entry, err := logical.StorageEntryJSON("crls/"+name, crlInfo)
if err != nil {
return nil, err
}
if err = req.Storage.Put(entry); err != nil {
return nil, err
}
b.crls[name] = crlInfo
return nil, nil
}
// Generates steps to test out CA configuration -- certificates + CRL expiry,
// and ensure that the certificates are readable after storing them
func generateCATestingSteps(t *testing.T, caCert, caKey, otherCaCert string, intdata, reqdata map[string]interface{}) []logicaltest.TestStep {
ret := []logicaltest.TestStep{
logicaltest.TestStep{
Operation: logical.WriteOperation,
Path: "config/ca",
Data: map[string]interface{}{
"pem_bundle": caKey + caCert,
},
},
logicaltest.TestStep{
Operation: logical.WriteOperation,
Path: "config/crl",
Data: map[string]interface{}{
"expiry": "16h",
},
},
// Ensure we can fetch it back via unauthenticated means, in various formats
logicaltest.TestStep{
Operation: logical.ReadOperation,
Path: "cert/ca",
Unauthenticated: true,
Check: func(resp *logical.Response) error {
if resp.Data["certificate"].(string) != caCert {
return fmt.Errorf("CA certificate:\n%s\ndoes not match original:\n%s\n", resp.Data["certificate"].(string), caCert)
}
return nil
},
},
logicaltest.TestStep{
Operation: logical.ReadOperation,
Path: "ca/pem",
Unauthenticated: true,
Check: func(resp *logical.Response) error {
rawBytes := resp.Data["http_raw_body"].([]byte)
if string(rawBytes) != caCert {
return fmt.Errorf("CA certificate:\n%s\ndoes not match original:\n%s\n", string(rawBytes), caCert)
}
if resp.Data["http_content_type"].(string) != "application/pkix-cert" {
return fmt.Errorf("Expected application/pkix-cert as content-type, but got %s", resp.Data["http_content_type"].(string))
}
return nil
},
},
logicaltest.TestStep{
Operation: logical.ReadOperation,
Path: "ca",
Unauthenticated: true,
Check: func(resp *logical.Response) error {
rawBytes := resp.Data["http_raw_body"].([]byte)
pemBytes := pem.EncodeToMemory(&pem.Block{
Type: "CERTIFICATE",
Bytes: rawBytes,
})
if string(pemBytes) != caCert {
return fmt.Errorf("CA certificate:\n%s\ndoes not match original:\n%s\n", string(pemBytes), caCert)
}
if resp.Data["http_content_type"].(string) != "application/pkix-cert" {
return fmt.Errorf("Expected application/pkix-cert as content-type, but got %s", resp.Data["http_content_type"].(string))
}
return nil
},
},
logicaltest.TestStep{
Operation: logical.ReadOperation,
Path: "config/crl",
Check: func(resp *logical.Response) error {
if resp.Data["expiry"].(string) != "16h" {
return fmt.Errorf("CRL lifetimes do not match (got %s)", resp.Data["expiry"].(string))
}
return nil
},
},
// Ensure that both parts of the PEM bundle are required
// Here, just the cert
logicaltest.TestStep{
Operation: logical.WriteOperation,
Path: "config/ca",
Data: map[string]interface{}{
"pem_bundle": caCert,
},
ErrorOk: true,
},
// Here, just the key
logicaltest.TestStep{
Operation: logical.WriteOperation,
Path: "config/ca",
Data: map[string]interface{}{
"pem_bundle": caKey,
},
ErrorOk: true,
},
// Ensure we can fetch it back via unauthenticated means, in various formats
logicaltest.TestStep{
Operation: logical.ReadOperation,
Path: "cert/ca",
Unauthenticated: true,
Check: func(resp *logical.Response) error {
if resp.Data["certificate"].(string) != caCert {
return fmt.Errorf("CA certificate:\n%s\ndoes not match original:\n%s\n", resp.Data["certificate"].(string), caCert)
}
return nil
},
},
logicaltest.TestStep{
Operation: logical.ReadOperation,
Path: "ca/pem",
Unauthenticated: true,
Check: func(resp *logical.Response) error {
rawBytes := resp.Data["http_raw_body"].([]byte)
if string(rawBytes) != caCert {
return fmt.Errorf("CA certificate:\n%s\ndoes not match original:\n%s\n", string(rawBytes), caCert)
}
if resp.Data["http_content_type"].(string) != "application/pkix-cert" {
return fmt.Errorf("Expected application/pkix-cert as content-type, but got %s", resp.Data["http_content_type"].(string))
}
return nil
},
},
logicaltest.TestStep{
Operation: logical.ReadOperation,
Path: "ca",
Unauthenticated: true,
Check: func(resp *logical.Response) error {
rawBytes := resp.Data["http_raw_body"].([]byte)
pemBytes := pem.EncodeToMemory(&pem.Block{
Type: "CERTIFICATE",
Bytes: rawBytes,
})
if string(pemBytes) != caCert {
return fmt.Errorf("CA certificate:\n%s\ndoes not match original:\n%s\n", string(pemBytes), caCert)
}
if resp.Data["http_content_type"].(string) != "application/pkix-cert" {
return fmt.Errorf("Expected application/pkix-cert as content-type, but got %s", resp.Data["http_content_type"].(string))
}
return nil
},
},
// Test a bunch of generation stuff
logicaltest.TestStep{
Operation: logical.WriteOperation,
Path: "root/generate/exported",
Data: map[string]interface{}{
"common_name": "Root Cert",
"ttl": "180h",
},
Check: func(resp *logical.Response) error {
intdata["root"] = resp.Data["certificate"].(string)
intdata["rootkey"] = resp.Data["private_key"].(string)
reqdata["pem_bundle"] = intdata["root"].(string) + "\n" + intdata["rootkey"].(string)
return nil
},
},
logicaltest.TestStep{
Operation: logical.WriteOperation,
Path: "intermediate/generate/exported",
Data: map[string]interface{}{
"common_name": "Intermediate Cert",
},
Check: func(resp *logical.Response) error {
intdata["intermediatecsr"] = resp.Data["csr"].(string)
intdata["intermediatekey"] = resp.Data["private_key"].(string)
return nil
},
},
// Re-load the root key in so we can sign it
logicaltest.TestStep{
Operation: logical.WriteOperation,
Path: "config/ca",
Data: reqdata,
Check: func(resp *logical.Response) error {
delete(reqdata, "pem_bundle")
delete(reqdata, "ttl")
reqdata["csr"] = intdata["intermediatecsr"].(string)
reqdata["common_name"] = "Intermediate Cert"
reqdata["ttl"] = "90h"
return nil
},
},
logicaltest.TestStep{
Operation: logical.WriteOperation,
Path: "root/sign-intermediate",
Data: reqdata,
Check: func(resp *logical.Response) error {
delete(reqdata, "csr")
delete(reqdata, "common_name")
delete(reqdata, "ttl")
intdata["intermediatecert"] = resp.Data["certificate"].(string)
reqdata["serial_number"] = resp.Data["serial_number"].(string)
reqdata["certificate"] = resp.Data["certificate"].(string)
reqdata["pem_bundle"] = intdata["intermediatekey"].(string) + "\n" + resp.Data["certificate"].(string)
return nil
},
},
// First load in this way to populate the private key
logicaltest.TestStep{
Operation: logical.WriteOperation,
Path: "config/ca",
Data: reqdata,
Check: func(resp *logical.Response) error {
delete(reqdata, "pem_bundle")
return nil
},
},
// Now test setting the intermediate, signed CA cert
logicaltest.TestStep{
Operation: logical.WriteOperation,
Path: "intermediate/set-signed",
Data: reqdata,
Check: func(resp *logical.Response) error {
delete(reqdata, "certificate")
return nil
},
},
logicaltest.TestStep{
Operation: logical.WriteOperation,
Path: "revoke",
Data: reqdata,
},
logicaltest.TestStep{
Operation: logical.ReadOperation,
Path: "crl",
Data: reqdata,
Check: func(resp *logical.Response) error {
crlBytes := resp.Data["http_raw_body"].([]byte)
certList, err := x509.ParseCRL(crlBytes)
if err != nil {
t.Fatalf("err: %s", err)
}
revokedList := certList.TBSCertList.RevokedCertificates
if len(revokedList) != 1 {
t.Fatalf("length of revoked list not 1; %d", len(revokedList))
}
revokedString := certutil.GetOctalFormatted(revokedList[0].SerialNumber.Bytes(), ":")
if revokedString != reqdata["serial_number"].(string) {
t.Fatalf("got serial %s, expecting %s", revokedString, reqdata["serial_number"].(string))
}
delete(reqdata, "serial_number")
return nil
},
},
// Do it all again, with EC keys and DER format
logicaltest.TestStep{
Operation: logical.WriteOperation,
Path: "root/generate/exported",
Data: map[string]interface{}{
"common_name": "Root Cert",
"ttl": "180h",
"key_type": "ec",
"key_bits": 384,
"format": "der",
},
Check: func(resp *logical.Response) error {
certBytes, _ := base64.StdEncoding.DecodeString(resp.Data["certificate"].(string))
certPem := pem.EncodeToMemory(&pem.Block{
Type: "CERTIFICATE",
Bytes: certBytes,
})
keyBytes, _ := base64.StdEncoding.DecodeString(resp.Data["private_key"].(string))
keyPem := pem.EncodeToMemory(&pem.Block{
Type: "EC PRIVATE KEY",
Bytes: keyBytes,
})
intdata["root"] = string(certPem)
intdata["rootkey"] = string(keyPem)
reqdata["pem_bundle"] = string(certPem) + "\n" + string(keyPem)
return nil
},
},
logicaltest.TestStep{
Operation: logical.WriteOperation,
Path: "intermediate/generate/exported",
Data: map[string]interface{}{
"format": "der",
"key_type": "ec",
"key_bits": 384,
"common_name": "Intermediate Cert",
},
Check: func(resp *logical.Response) error {
csrBytes, _ := base64.StdEncoding.DecodeString(resp.Data["csr"].(string))
csrPem := pem.EncodeToMemory(&pem.Block{
Type: "CERTIFICATE REQUEST",
Bytes: csrBytes,
})
keyBytes, _ := base64.StdEncoding.DecodeString(resp.Data["private_key"].(string))
keyPem := pem.EncodeToMemory(&pem.Block{
Type: "EC PRIVATE KEY",
Bytes: keyBytes,
})
intdata["intermediatecsr"] = string(csrPem)
intdata["intermediatekey"] = string(keyPem)
return nil
},
},
logicaltest.TestStep{
Operation: logical.WriteOperation,
Path: "config/ca",
Data: reqdata,
Check: func(resp *logical.Response) error {
delete(reqdata, "pem_bundle")
delete(reqdata, "ttl")
reqdata["csr"] = intdata["intermediatecsr"].(string)
reqdata["common_name"] = "Intermediate Cert"
reqdata["ttl"] = "90h"
return nil
},
},
logicaltest.TestStep{
Operation: logical.WriteOperation,
Path: "root/sign-intermediate",
Data: reqdata,
Check: func(resp *logical.Response) error {
delete(reqdata, "csr")
delete(reqdata, "common_name")
delete(reqdata, "ttl")
intdata["intermediatecert"] = resp.Data["certificate"].(string)
reqdata["serial_number"] = resp.Data["serial_number"].(string)
reqdata["certificate"] = resp.Data["certificate"].(string)
reqdata["pem_bundle"] = intdata["intermediatekey"].(string) + "\n" + resp.Data["certificate"].(string)
return nil
},
},
// First load in this way to populate the private key
logicaltest.TestStep{
Operation: logical.WriteOperation,
Path: "config/ca",
Data: reqdata,
Check: func(resp *logical.Response) error {
delete(reqdata, "pem_bundle")
return nil
},
},
// Now test setting the intermediate, signed CA cert
logicaltest.TestStep{
Operation: logical.WriteOperation,
Path: "intermediate/set-signed",
Data: reqdata,
Check: func(resp *logical.Response) error {
delete(reqdata, "certificate")
return nil
},
},
logicaltest.TestStep{
Operation: logical.WriteOperation,
Path: "revoke",
Data: reqdata,
},
logicaltest.TestStep{
Operation: logical.ReadOperation,
Path: "crl",
Data: reqdata,
Check: func(resp *logical.Response) error {
crlBytes := resp.Data["http_raw_body"].([]byte)
certList, err := x509.ParseCRL(crlBytes)
if err != nil {
t.Fatalf("err: %s", err)
}
revokedList := certList.TBSCertList.RevokedCertificates
if len(revokedList) != 2 {
t.Fatalf("length of revoked list not 2; %d", len(revokedList))
}
found := false
for _, revEntry := range revokedList {
revokedString := certutil.GetOctalFormatted(revEntry.SerialNumber.Bytes(), ":")
if revokedString == reqdata["serial_number"].(string) {
found = true
}
}
if !found {
t.Fatalf("did not find %s in CRL", reqdata["serial_number"].(string))
}
delete(reqdata, "serial_number")
return nil
},
},
}
return ret
}
func main() {
interPEMPtr := flag.String("inter", "", "a PEM file containing intermediates")
rootPEMPtr := flag.String("roots", "", "a PEM file containing roots")
crlPtr := flag.String("crl", "", "a CRL file")
flag.Parse()
var rootPool, intermediatePool *x509.CertPool
var roots, intermediates []*x509.Certificate
if nil != rootPEMPtr && len(*rootPEMPtr) > 0 {
rootPool, roots = loadCertPool(*rootPEMPtr)
}
if nil != interPEMPtr && len(*interPEMPtr) > 0 {
intermediatePool, intermediates = loadCertPool(*interPEMPtr)
}
var crlData []byte
if nil != crlPtr && len(*crlPtr) > 0 {
// Get the crl from the args
var err error
crlData, err = ioutil.ReadFile(*crlPtr)
check(err)
}
if len(crlData) > 0 {
// Maybe it's PEM; try to parse as PEM, if that fails, just use the bytes
block, _ := pem.Decode(crlData)
if block != nil {
crlData = block.Bytes
}
crl, err := x509.ParseCRL(crlData)
if err != nil {
panic("could not parse CRL")
}
// check the CRL is still current
if crl.HasExpired(time.Now()) {
fmt.Printf("crl has expired\n")
}
var signer *x509.Certificate
if nil != roots {
signer = findSigningCert(roots, crl)
if nil == signer {
fmt.Printf("Not signed by a root; trying known intermediates\n")
if nil != intermediates {
signer = findSigningCert(intermediates, crl)
}
}
}
if nil != signer {
fmt.Printf("found signer! %v\n", signer.Subject)
opts := x509.VerifyOptions{
Roots: rootPool,
Intermediates: intermediatePool,
}
if _, err := signer.Verify(opts); err != nil {
fmt.Println("Warning! Can't verify signer!")
}
}
issuerData, err := asn1.Marshal(crl.TBSCertList.Issuer)
if nil == err {
issuerString := base64.StdEncoding.EncodeToString(issuerData)
fmt.Printf("%v\n", issuerString)
}
for revoked := range crl.TBSCertList.RevokedCertificates {
cert := crl.TBSCertList.RevokedCertificates[revoked]
fmt.Printf(" %v\n",
base64.StdEncoding.EncodeToString(cert.SerialNumber.Bytes()))
}
}
}
func crlRevCheck(certChain []*x509.Certificate) (Warning, error) {
var warn Warning
var warnDetails string
var passedChecks int
numChecks := len(certChain) - 1 // revocation can't be checked on the root
// main revocation check loop
for i := 0; i < numChecks; i++ {
target := certChain[i]
issuer := certChain[i+1]
// get CRL URLs
urls := target.CRLDistributionPoints
numURLs := len(urls)
var triedURLs int
// url check loop
for cntr := 0; triedURLs == 0 && cntr < numURLs; cntr++ {
url := urls[cntr]
// get CRL
crl, err := GetCRL(url)
if err != nil {
warnDetails = warnDetails + fmt.Sprintf("\n * Failed to get CRL, details: %s", err)
warn = errors.New(warnDetails)
break
}
// parse CRL
revCertList, err := x509.ParseCRL(crl)
if err != nil {
warnDetails = warnDetails + fmt.Sprintf("\n * Failed to parse CRL, issuer: %s", GetSubjectDN(issuer))
warn = errors.New(warnDetails)
break
}
// check CRL validity
if revCertList.HasExpired(time.Now()) {
warnDetails = warnDetails + fmt.Sprintf("\n * CRL expired, issuer: %s", GetSubjectDN(issuer))
warn = errors.New(warnDetails)
break
}
// validate CRL signature
err = issuer.CheckCRLSignature(revCertList)
if err != nil {
warnDetails = warnDetails + fmt.Sprintf("\n * CRL signature invalid, issuer: %s", GetSubjectDN(issuer))
warn = errors.New(warnDetails)
break
}
// check if the cert has been revoked
err = CheckRevoked(target.SerialNumber, revCertList)
if err != nil {
warn = errors.New(warnDetails)
return warn, err
}
triedURLs++
passedChecks++
}
}
if warn != nil {
warn = errors.New(warnDetails)
return warn, nil
}
return nil, nil
}