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certs.go
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certs.go
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/*-
* Copyright 2016 Square Inc.
*
* 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 lib
import (
"bufio"
"bytes"
"crypto"
"crypto/ecdsa"
"crypto/rsa"
"crypto/x509"
"encoding/binary"
"encoding/pem"
"errors"
"fmt"
"io"
"io/ioutil"
"os"
"path/filepath"
"reflect"
"strings"
"github.com/square/certigo/jceks"
"github.com/square/certigo/pkcs7"
"golang.org/x/crypto/pkcs12"
)
const (
// nameHeader is the PEM header field for the friendly name/alias of the key in the key store.
nameHeader = "friendlyName"
// fileHeader is the origin file where the key came from (as in file on disk).
fileHeader = "originFile"
)
var fileExtToFormat = map[string]string{
".pem": "PEM",
".crt": "PEM",
".p7b": "PEM",
".p7c": "PEM",
".p12": "PKCS12",
".pfx": "PKCS12",
".jceks": "JCEKS",
".jks": "JCEKS", // Only partially supported
".der": "DER",
}
var badSignatureAlgorithms = [...]x509.SignatureAlgorithm{
x509.MD2WithRSA,
x509.MD5WithRSA,
x509.SHA1WithRSA,
x509.DSAWithSHA1,
x509.ECDSAWithSHA1,
}
func errorFromErrors(errs []error) error {
if len(errs) == 0 {
return nil
}
if len(errs) == 1 {
return errs[0]
}
buffer := new(bytes.Buffer)
buffer.WriteString("encountered multiple errors:\n")
for _, err := range errs {
buffer.WriteString("* ")
buffer.WriteString(strings.TrimSuffix(err.Error(), "\n"))
buffer.WriteString("\n")
}
return errors.New(buffer.String())
}
// ReadAsPEMFromFiles will read PEM blocks from the given set of inputs. Input
// data may be in plain-text PEM files, DER-encoded certificates or PKCS7
// envelopes, or PKCS12/JCEKS keystores. All inputs will be converted to PEM
// blocks and passed to the callback.
func ReadAsPEMFromFiles(files []*os.File, format string, password func(string) string, callback func(*pem.Block)) error {
errs := []error{}
for _, file := range files {
reader := bufio.NewReaderSize(file, 4)
format, err := formatForFile(reader, file.Name(), format)
if err != nil {
return fmt.Errorf("unable to guess file type for file %s, try adding --format flag", file.Name())
}
err = readCertsFromStream(reader, file.Name(), format, password, callback)
if err != nil {
errs = append(errs, err)
}
}
return errorFromErrors(errs)
}
// ReadAsPEM will read PEM blocks from the given set of inputs. Input data may
// be in plain-text PEM files, DER-encoded certificates or PKCS7 envelopes, or
// PKCS12/JCEKS keystores. All inputs will be converted to PEM blocks and
// passed to the callback.
func ReadAsPEM(readers []io.Reader, format string, password func(string) string, callback func(*pem.Block)) error {
errs := []error{}
for _, r := range readers {
reader := bufio.NewReaderSize(r, 4)
format, err := formatForFile(reader, "", format)
if err != nil {
return fmt.Errorf("unable to guess format for input stream")
}
err = readCertsFromStream(reader, "", format, password, callback)
if err != nil {
errs = append(errs, err)
}
}
return errorFromErrors(errs)
}
// ReadAsX509FromFiles will read X.509 certificates from the given set of
// inputs. Input data may be in plain-text PEM files, DER-encoded certificates
// or PKCS7 envelopes, or PKCS12/JCEKS keystores. All inputs will be converted
// to X.509 certificates (private keys are skipped) and passed to the callback.
func ReadAsX509FromFiles(files []*os.File, format string, password func(string) string, callback func(*x509.Certificate, error)) error {
errs := []error{}
for _, file := range files {
reader := bufio.NewReaderSize(file, 4)
format, err := formatForFile(reader, file.Name(), format)
if err != nil {
return fmt.Errorf("unable to guess file type for file %s, try adding --format flag", file.Name())
}
err = readCertsFromStream(reader, file.Name(), format, password, pemToX509(callback))
if err != nil {
errs = append(errs, err)
}
}
return errorFromErrors(errs)
}
// ReadAsX509 will read X.509 certificates from the given set of inputs. Input
// data may be in plain-text PEM files, DER-encoded certificates or PKCS7
// envelopes, or PKCS12/JCEKS keystores. All inputs will be converted to X.509
// certificates (private keys are skipped) and passed to the callback.
func ReadAsX509(readers []io.Reader, format string, password func(string) string, callback func(*x509.Certificate, error)) error {
errs := []error{}
for _, r := range readers {
reader := bufio.NewReaderSize(r, 4)
format, err := formatForFile(reader, "", format)
if err != nil {
return fmt.Errorf("unable to guess format for input stream")
}
err = readCertsFromStream(reader, "", format, password, pemToX509(callback))
if err != nil {
errs = append(errs, err)
}
}
return errorFromErrors(errs)
}
func pemToX509(callback func(*x509.Certificate, error)) func(*pem.Block) {
return func(block *pem.Block) {
switch block.Type {
case "CERTIFICATE":
cert, err := x509.ParseCertificate(block.Bytes)
callback(cert, err)
case "PKCS7":
certs, err := pkcs7.ExtractCertificates(block.Bytes)
if err == nil {
for _, cert := range certs {
callback(cert, nil)
}
} else {
callback(nil, err)
}
}
}
}
// readCertsFromStream takes some input and converts it to PEM blocks.
func readCertsFromStream(reader io.Reader, filename string, format string, password func(string) string, callback func(*pem.Block)) error {
headers := map[string]string{}
if filename != "" && filename != os.Stdin.Name() {
headers[fileHeader] = filename
}
switch strings.TrimSpace(format) {
case "PEM":
scanner := pemScanner(reader)
for scanner.Scan() {
block, _ := pem.Decode(scanner.Bytes())
block.Headers = mergeHeaders(block.Headers, headers)
callback(block)
}
return nil
case "DER":
data, err := ioutil.ReadAll(reader)
if err != nil {
return fmt.Errorf("unable to read input: %s\n", err)
}
x509Certs, err0 := x509.ParseCertificates(data)
if err0 == nil {
for _, cert := range x509Certs {
callback(EncodeX509ToPEM(cert, headers))
}
return nil
}
p7bBlocks, err1 := pkcs7.ParseSignedData(data)
if err1 == nil {
for _, block := range p7bBlocks {
callback(pkcs7ToPem(block, headers))
}
return nil
}
return fmt.Errorf("unable to parse certificates from DER data\n* X.509 parser gave: %s\n* PKCS7 parser gave: %s\n", err0, err1)
case "PKCS12":
data, err := ioutil.ReadAll(reader)
if err != nil {
return fmt.Errorf("unable to read input: %s\n", err)
}
blocks, err := pkcs12.ToPEM(data, password(""))
if err != nil || len(blocks) == 0 {
return fmt.Errorf("keystore appears to be empty or password was incorrect\n")
}
for _, block := range blocks {
block.Headers = mergeHeaders(block.Headers, headers)
callback(block)
}
return nil
case "JCEKS":
keyStore, err := jceks.LoadFromReader(reader, []byte(password("")))
if err != nil {
return fmt.Errorf("unable to parse keystore: %s\n", err)
}
for _, alias := range keyStore.ListCerts() {
cert, _ := keyStore.GetCert(alias)
callback(EncodeX509ToPEM(cert, mergeHeaders(headers, map[string]string{nameHeader: alias})))
}
for _, alias := range keyStore.ListPrivateKeys() {
key, certs, err := keyStore.GetPrivateKeyAndCerts(alias, []byte(password(alias)))
if err != nil {
return fmt.Errorf("unable to parse keystore: %s\n", err)
}
block, err := keyToPem(key, mergeHeaders(headers, map[string]string{nameHeader: alias}))
if err != nil {
return fmt.Errorf("problem reading key: %s\n", err)
}
callback(block)
for _, cert := range certs {
callback(EncodeX509ToPEM(cert, mergeHeaders(headers, map[string]string{nameHeader: alias})))
}
}
return nil
}
return fmt.Errorf("unknown file type '%s'\n", format)
}
func mergeHeaders(baseHeaders, extraHeaders map[string]string) (headers map[string]string) {
headers = map[string]string{}
for k, v := range baseHeaders {
headers[k] = v
}
for k, v := range extraHeaders {
headers[k] = v
}
return
}
// EncodeX509ToPEM converts an X.509 certificate into a PEM block for output.
func EncodeX509ToPEM(cert *x509.Certificate, headers map[string]string) *pem.Block {
return &pem.Block{
Type: "CERTIFICATE",
Bytes: cert.Raw,
Headers: headers,
}
}
// Convert a PKCS7 envelope into a PEM block for output.
func pkcs7ToPem(block *pkcs7.SignedDataEnvelope, headers map[string]string) *pem.Block {
return &pem.Block{
Type: "PKCS7",
Bytes: block.Raw,
Headers: headers,
}
}
// Convert a key into one or more PEM blocks for output.
func keyToPem(key crypto.PrivateKey, headers map[string]string) (*pem.Block, error) {
switch k := key.(type) {
case *rsa.PrivateKey:
return &pem.Block{
Type: "RSA PRIVATE KEY",
Bytes: x509.MarshalPKCS1PrivateKey(k),
Headers: headers,
}, nil
case *ecdsa.PrivateKey:
raw, err := x509.MarshalECPrivateKey(k)
if err != nil {
return nil, fmt.Errorf("error marshaling key: %s\n", reflect.TypeOf(key))
}
return &pem.Block{
Type: "EC PRIVATE KEY",
Bytes: raw,
Headers: headers,
}, nil
}
return nil, fmt.Errorf("unknown key type: %s\n", reflect.TypeOf(key))
}
// formatForFile returns the file format (either from flags or
// based on file extension).
func formatForFile(file *bufio.Reader, filename, format string) (string, error) {
// First, honor --format flag we got from user
if format != "" {
return format, nil
}
// Second, attempt to guess based on extension
guess, ok := fileExtToFormat[strings.ToLower(filepath.Ext(filename))]
if ok {
return guess, nil
}
// Third, attempt to guess based on first 4 bytes of input
data, err := file.Peek(4)
if err != nil {
return "", fmt.Errorf("unable to read file: %s\n", err)
}
// Heuristics for guessing -- best effort.
magic := binary.BigEndian.Uint32(data)
if magic == 0xCECECECE || magic == 0xFEEDFEED {
// JCEKS/JKS files always start with this prefix
return "JCEKS", nil
}
if magic == 0x2D2D2D2D || magic == 0x434f4e4e {
// Starts with '----' or 'CONN' (what s_client prints...)
return "PEM", nil
}
if magic&0xFFFF0000 == 0x30820000 {
// Looks like the input is DER-encoded, so it's either PKCS12 or X.509.
if magic&0x0000FF00 == 0x0300 {
// Probably X.509
return "DER", nil
}
return "PKCS12", nil
}
return "", fmt.Errorf("unable to guess file format")
}
// pemScanner will return a bufio.Scanner that splits the input
// from the given reader into PEM blocks.
func pemScanner(reader io.Reader) *bufio.Scanner {
scanner := bufio.NewScanner(reader)
scanner.Split(func(data []byte, atEOF bool) (int, []byte, error) {
block, rest := pem.Decode(data)
if block != nil {
size := len(data) - len(rest)
return size, data[:size], nil
}
return 0, nil, nil
})
return scanner
}