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secsipid.go
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secsipid.go
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package secsipid
import (
"crypto"
"crypto/ecdsa"
"crypto/rand"
"crypto/x509"
"encoding/base64"
"encoding/json"
"encoding/pem"
"errors"
"fmt"
"io/ioutil"
"math/big"
"net/http"
"strings"
"time"
"unicode"
"github.com/google/uuid"
)
// SJWTHeader - header for JWT
type SJWTHeader struct {
Alg string `json:"alg"`
Ppt string `json:"ppt"`
Typ string `json:"typ"`
X5u string `json:"x5u"`
}
// SJWTDest --
type SJWTDest struct {
TN []string `json:"tn"`
}
// SJWTOrig --
type SJWTOrig struct {
TN string `json:"tn"`
}
// SJWTPayload - JWT payload
type SJWTPayload struct {
ATTest string `json:"attest"`
Dest SJWTDest `json:"dest"`
IAT int64 `json:"iat"`
Orig SJWTOrig `json:"orig"`
OrigID string `json:"origid"`
}
var (
sES256KeyBits = 256
sES256KeySize = 32
)
// SJWTRemoveWhiteSpaces --
func SJWTRemoveWhiteSpaces(s string) string {
rout := make([]rune, 0, len(s))
for _, r := range s {
if !unicode.IsSpace(r) {
rout = append(rout, r)
}
}
return string(rout)
}
// SJWTParseECPrivateKeyFromPEM Parse PEM encoded Elliptic Curve Private Key Structure
func SJWTParseECPrivateKeyFromPEM(key []byte) (*ecdsa.PrivateKey, error) {
var err error
var block *pem.Block
if block, _ = pem.Decode(key); block == nil {
return nil, errors.New("key must be PEM encoded")
}
var parsedKey interface{}
if parsedKey, err = x509.ParseECPrivateKey(block.Bytes); err != nil {
if parsedKey, err = x509.ParsePKCS8PrivateKey(block.Bytes); err != nil {
return nil, err
}
}
var pkey *ecdsa.PrivateKey
var ok bool
if pkey, ok = parsedKey.(*ecdsa.PrivateKey); !ok {
return nil, errors.New("not EC private key")
}
return pkey, nil
}
// SJWTParseECPublicKeyFromPEM Parse PEM encoded PKCS1 or PKCS8 public key
func SJWTParseECPublicKeyFromPEM(key []byte) (*ecdsa.PublicKey, error) {
var err error
var block *pem.Block
if block, _ = pem.Decode(key); block == nil {
return nil, errors.New("key must be PEM encoded")
}
var parsedKey interface{}
if parsedKey, err = x509.ParsePKIXPublicKey(block.Bytes); err != nil {
if cert, err := x509.ParseCertificate(block.Bytes); err == nil {
parsedKey = cert.PublicKey
} else {
return nil, err
}
}
var pkey *ecdsa.PublicKey
var ok bool
if pkey, ok = parsedKey.(*ecdsa.PublicKey); !ok {
return nil, errors.New("not EC public key")
}
return pkey, nil
}
// SJWTBase64EncodeString encode string to base64 with padding stripped
func SJWTBase64EncodeString(src string) string {
return strings.
TrimRight(base64.URLEncoding.
EncodeToString([]byte(src)), "=")
}
// SJWTBase64DecodeString takes in a base 64 encoded string and returns the
// actual string or an error of it fails to decode the string
func SJWTBase64DecodeString(src string) (string, error) {
if l := len(src) % 4; l > 0 {
src += strings.Repeat("=", 4-l)
}
decoded, err := base64.URLEncoding.DecodeString(src)
if err != nil {
return "", fmt.Errorf("decoding error %s", err)
}
return string(decoded), nil
}
// SJWTBase64EncodeBytes encode bytes array to base64 with padding stripped
func SJWTBase64EncodeBytes(seg []byte) string {
return strings.TrimRight(base64.URLEncoding.EncodeToString(seg), "=")
}
// SJWTBase64DecodeBytes takes in a base 64 encoded string and returns the
// actual bytes array or an error of it fails to decode the string
func SJWTBase64DecodeBytes(seg string) ([]byte, error) {
if l := len(seg) % 4; l > 0 {
seg += strings.Repeat("=", 4-l)
}
return base64.URLEncoding.DecodeString(seg)
}
// SJWTGetURLContent --
func SJWTGetURLContent(urlVal string, timeoutVal int) ([]byte, error) {
httpClient := http.Client{
Timeout: time.Duration(timeoutVal) * time.Second,
}
resp, err := httpClient.Get(urlVal)
if err != nil {
return nil, fmt.Errorf("http get failure: %v", err)
}
defer resp.Body.Close()
if resp.StatusCode != http.StatusOK {
return nil, fmt.Errorf("http status error: %v", resp.StatusCode)
}
data, err := ioutil.ReadAll(resp.Body)
if err != nil {
return nil, fmt.Errorf("read http body failure: %v", err)
}
return data, nil
}
// SJWTGetValidPayload --
func SJWTGetValidPayload(base64Payload string, expireVal int) (*SJWTPayload, error) {
decodedPayload, payloadErr := SJWTBase64DecodeString(base64Payload)
if payloadErr != nil {
return nil, fmt.Errorf("invalid payload: %s", payloadErr.Error())
}
payload := SJWTPayload{}
err := json.Unmarshal([]byte(decodedPayload), &payload)
if err != nil {
return nil, fmt.Errorf("invalid payload: %s", err.Error())
}
if payload.IAT != 0 && time.Now().Unix() > payload.IAT+int64(expireVal) {
return nil, errors.New("expired token")
}
return &payload, nil
}
// SJWTVerifyWithPubKey - implements the verify
// For this verify method, key must be an ecdsa.PublicKey struct
func SJWTVerifyWithPubKey(signingString string, signature string, key interface{}) (int, error) {
var err error
var sig []byte
if sig, err = SJWTBase64DecodeBytes(signature); err != nil {
return -1, err
}
var ecdsaKey *ecdsa.PublicKey
switch k := key.(type) {
case *ecdsa.PublicKey:
ecdsaKey = k
default:
return -1, errors.New("invalid key type")
}
if len(sig) != 2*sES256KeySize {
return -1, errors.New("ECDSA signature size verification failed")
}
r := big.NewInt(0).SetBytes(sig[:sES256KeySize])
s := big.NewInt(0).SetBytes(sig[sES256KeySize:])
if !crypto.SHA256.Available() {
return -1, errors.New("hashing function unavailable")
}
hasher := crypto.SHA256.New()
hasher.Write([]byte(signingString))
if verifystatus := ecdsa.Verify(ecdsaKey, hasher.Sum(nil), r, s); verifystatus == true {
return 0, nil
}
return -1, errors.New("ECDSA verification failed")
}
// SJWTSignWithPrvKey - implements the signing
// For this signing method, key must be an ecdsa.PrivateKey struct
func SJWTSignWithPrvKey(signingString string, key interface{}) (string, error) {
var ecdsaKey *ecdsa.PrivateKey
switch k := key.(type) {
case *ecdsa.PrivateKey:
ecdsaKey = k
default:
return "", errors.New("invalid key type")
}
if !crypto.SHA256.Available() {
return "", errors.New("hashing function not available")
}
hasher := crypto.SHA256.New()
hasher.Write([]byte(signingString))
r, s, err := ecdsa.Sign(rand.Reader, ecdsaKey, hasher.Sum(nil))
if err == nil {
curveBits := ecdsaKey.Curve.Params().BitSize
if sES256KeyBits != curveBits {
return "", errors.New("invalid key size")
}
keyBytes := curveBits / 8
if curveBits%8 > 0 {
keyBytes++
}
rBytes := r.Bytes()
rBytesPadded := make([]byte, keyBytes)
copy(rBytesPadded[keyBytes-len(rBytes):], rBytes)
sBytes := s.Bytes()
sBytesPadded := make([]byte, keyBytes)
copy(sBytesPadded[keyBytes-len(sBytes):], sBytes)
out := append(rBytesPadded, sBytesPadded...)
return SJWTBase64EncodeBytes(out), nil
}
return "", err
}
// SJWTEncode - encode payload to JWT
func SJWTEncode(header SJWTHeader, payload SJWTPayload, prvkey interface{}) string {
str, _ := json.Marshal(header)
jwthdr := SJWTBase64EncodeString(string(str))
encodedPayload, _ := json.Marshal(payload)
signingValue := jwthdr + "." +
SJWTBase64EncodeString(string(encodedPayload))
signatureValue, _ := SJWTSignWithPrvKey(signingValue, prvkey)
return signingValue + "." + signatureValue
}
// SJWTDecodeWithPubKey - decode JWT string
func SJWTDecodeWithPubKey(jwt string, expireVal int, pubkey interface{}) (*SJWTPayload, error) {
var ret int
var err error
var payload *SJWTPayload
token := strings.Split(strings.TrimSpace(jwt), ".")
if len(token) != 3 {
splitErr := errors.New("invalid token - must contain header, payload and signature")
return nil, splitErr
}
payload, err = SJWTGetValidPayload(token[1], expireVal)
if err != nil {
return nil, fmt.Errorf("getting payload failed: (%d) %v", ret, err)
}
signatureValue := token[0] + "." + token[1]
ret, err = SJWTVerifyWithPubKey(signatureValue, token[2], pubkey)
if err != nil {
return nil, fmt.Errorf("verify failed: (%d) %v", ret, err)
}
return payload, nil
}
// SJWTEncodeText - encode header and payload to JWT
func SJWTEncodeText(headerJSON string, payloadJSON string, prvkeyPath string) (string, error) {
var err error
var signatureValue string
var ecdsaPrvKey *ecdsa.PrivateKey
prvkey, _ := ioutil.ReadFile(prvkeyPath)
if ecdsaPrvKey, err = SJWTParseECPrivateKeyFromPEM(prvkey); err != nil {
return "", err
}
signingValue := SJWTBase64EncodeString(strings.TrimSpace(headerJSON)) +
"." + SJWTBase64EncodeString(strings.TrimSpace(payloadJSON))
signatureValue, err = SJWTSignWithPrvKey(signingValue, ecdsaPrvKey)
if err != nil {
return "", fmt.Errorf("failed to build signature: %v", err)
}
return signingValue + "." + signatureValue, nil
}
// SJWTCheckIdentity - implements the verify of identity
func SJWTCheckIdentity(identityVal string, expireVal int, pubkeyPath string, timeoutVal int) (int, error) {
var err error
var ret int
var ecdsaPubKey *ecdsa.PublicKey
var pubkey []byte
var payload *SJWTPayload
token := strings.Split(strings.TrimSpace(identityVal), ".")
if len(token) != 3 {
return -1, fmt.Errorf("invalid token - must contain header, payload and signature")
}
payload, err = SJWTGetValidPayload(token[1], expireVal)
if err != nil {
return -1, err
}
if strings.HasPrefix(pubkeyPath, "http://") || strings.HasPrefix(pubkeyPath, "https://") {
pubkey, _ = SJWTGetURLContent(pubkeyPath, timeoutVal)
} else {
pubkey, _ = ioutil.ReadFile(pubkeyPath)
}
if ecdsaPubKey, err = SJWTParseECPublicKeyFromPEM(pubkey); err != nil {
return -1, err
}
ret, err = SJWTVerifyWithPubKey(token[0]+"."+token[1], token[2], ecdsaPubKey)
if err == nil {
return 0, nil
}
return 1, fmt.Errorf("failed to verify - origid (%s) (%d) %v", payload.OrigID, ret, err)
}
// SJWTCheckFullIdentity - implements the verify of identity
func SJWTCheckFullIdentity(identityVal string, expireVal int, pubkeyPath string, timeoutVal int) (int, error) {
hdrtoken := strings.Split(SJWTRemoveWhiteSpaces(identityVal), ";")
ret, err := SJWTCheckIdentity(hdrtoken[0], expireVal, pubkeyPath, timeoutVal)
if ret != 0 {
return ret, err
}
if len(hdrtoken) == 1 {
return 0, nil
}
paramInfo := ""
for i := 1; i < len(hdrtoken); i++ {
ptoken := strings.Split(hdrtoken[i], "=")
if len(ptoken) == 2 {
if ptoken[0] == "alg" {
if ptoken[1] != "ES256" {
return -2, fmt.Errorf("invalid value for alg header parameter")
}
} else if ptoken[0] == "ppt" {
if ptoken[1] != "shaken" {
return -2, fmt.Errorf("invalid value for ppt header parameter")
}
} else if ptoken[0] == "info" {
paramInfo = ptoken[1]
}
}
}
if len(paramInfo) <= 2 {
return 0, nil
}
if paramInfo[0] == '<' && paramInfo[len(paramInfo)-1] == '>' {
paramInfo = paramInfo[1 : len(paramInfo)-1]
}
btoken := strings.Split(strings.TrimSpace(hdrtoken[0]), ".")
if len(btoken[0]) == 0 {
return 0, nil
}
vHeader := ""
vHeader, err = SJWTBase64DecodeString(btoken[0])
header := SJWTHeader{}
err = json.Unmarshal([]byte(vHeader), &header)
if err != nil {
return -3, err
}
if len(header.Alg) > 0 && header.Alg != "ES256" {
return -2, fmt.Errorf("invalid value for alg in json header")
}
if len(header.Ppt) > 0 && header.Ppt != "shaken" {
return -2, fmt.Errorf("invalid value for ppt in json header")
}
if len(header.Typ) > 0 && header.Typ != "passport" {
return -2, fmt.Errorf("invalid value for typ in json header")
}
if len(header.X5u) > 0 && header.X5u != paramInfo {
return -2, fmt.Errorf("mismatching value for x5u and info attributes")
}
return 0, nil
}
// SJWTCheckFullIdentityURL - implements the verify of identity using URL
func SJWTCheckFullIdentityURL(identityVal string, expireVal int, timeoutVal int) (int, error) {
var ecdsaPubKey *ecdsa.PublicKey
var ret int
hdrtoken := strings.Split(SJWTRemoveWhiteSpaces(identityVal), ";")
if len(hdrtoken) == 1 {
return -1, fmt.Errorf("missing parts of the message header")
}
paramInfo := ""
for i := 1; i < len(hdrtoken); i++ {
ptoken := strings.Split(hdrtoken[i], "=")
if len(ptoken) == 2 {
if ptoken[0] == "alg" {
if ptoken[1] != "ES256" {
return -2, fmt.Errorf("invalid value for alg header parameter")
}
} else if ptoken[0] == "ppt" {
if ptoken[1] != "shaken" {
return -2, fmt.Errorf("invalid value for ppt header parameter")
}
} else if ptoken[0] == "info" {
paramInfo = ptoken[1]
}
}
}
if len(paramInfo) <= 2 {
return -1, fmt.Errorf("invalid value info header parameter")
}
if paramInfo[0] == '<' && paramInfo[len(paramInfo)-1] == '>' {
paramInfo = paramInfo[1 : len(paramInfo)-1]
}
pubkey, err := SJWTGetURLContent(paramInfo, timeoutVal)
if ecdsaPubKey, err = SJWTParseECPublicKeyFromPEM(pubkey); err != nil {
return -1, err
}
btoken := strings.Split(strings.TrimSpace(hdrtoken[0]), ".")
if len(btoken[0]) == 0 {
return -1, fmt.Errorf("ino json header part")
}
ret, err = SJWTVerifyWithPubKey(btoken[0]+"."+btoken[1], btoken[2], ecdsaPubKey)
if err != nil {
return ret, err
}
vHeader := ""
vHeader, err = SJWTBase64DecodeString(btoken[0])
header := SJWTHeader{}
err = json.Unmarshal([]byte(vHeader), &header)
if err != nil {
return -3, err
}
if len(header.Alg) > 0 && header.Alg != "ES256" {
return -2, fmt.Errorf("invalid value for alg in json header")
}
if len(header.Ppt) > 0 && header.Ppt != "shaken" {
return -2, fmt.Errorf("invalid value for ppt in json header")
}
if len(header.Typ) > 0 && header.Typ != "passport" {
return -2, fmt.Errorf("invalid value for typ in json header")
}
if len(header.X5u) > 0 && header.X5u != paramInfo {
return -2, fmt.Errorf("mismatching value for x5u and info attributes")
}
return ret, nil
}
// SJWTGetIdentity --
func SJWTGetIdentity(origTN string, destTN string, attestVal string, origID string, x5uVal string, prvkeyPath string) (string, error) {
var err error
var vOrigID string
header := SJWTHeader{
Alg: "ES256",
Ppt: "shaken",
Typ: "passport",
X5u: "https://127.0.0.1/cert.pem",
}
if len(x5uVal) > 0 {
header.X5u = x5uVal
}
if len(origID) > 0 {
vOrigID = origID
} else {
vuuid := uuid.New()
vOrigID = vuuid.String()
}
payload := SJWTPayload{
ATTest: attestVal,
Dest: SJWTDest{
TN: []string{destTN},
},
IAT: time.Now().Unix(),
Orig: SJWTOrig{
TN: origTN,
},
OrigID: vOrigID,
}
prvkey, _ := ioutil.ReadFile(prvkeyPath)
var ecdsaPrvKey *ecdsa.PrivateKey
if ecdsaPrvKey, err = SJWTParseECPrivateKeyFromPEM(prvkey); err != nil {
return "", fmt.Errorf("Unable to parse ECDSA private key: %v", err)
}
token := SJWTEncode(header, payload, ecdsaPrvKey)
if len(token) > 0 {
return token + ";info=<" + header.X5u + ">;>alg=ES256;ppt=shaken", nil
}
return "", nil
}