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jwt.go
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jwt.go
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package main
import (
"crypto"
"crypto/sha256"
"errors"
"fmt"
"time"
"golang.org/x/crypto/ssh"
"gopkg.in/square/go-jose.v2"
"gopkg.in/square/go-jose.v2/jwt"
)
// This actually gets the SSH key fingerprint
func getKeyFingerprint(key crypto.PublicKey) (string, error) {
sshPublicKey, err := ssh.NewPublicKey(key)
if err != nil {
return "", err
}
h := sha256.New()
h.Write(sshPublicKey.Marshal())
fp := fmt.Sprintf("%x", h.Sum(nil))
return fp, nil
}
func (state *RuntimeState) idpGetIssuer() string {
issuer := "https://" + state.HostIdentity
if state.Config.Base.HttpAddress != ":443" {
issuer = issuer + state.Config.Base.HttpAddress
}
return issuer
}
func (state *RuntimeState) JWTClaims(t *jwt.JSONWebToken, dest ...interface{}) (err error) {
for _, key := range state.KeymasterPublicKeys {
err = t.Claims(key, dest...)
if err == nil {
return nil
}
}
if err != nil {
return err
}
err = errors.New("No valid key found")
return err
}
func (state *RuntimeState) genNewSerializedAuthJWT(username string,
authLevel int, durationSeconds int64) (string, error) {
signerOptions := (&jose.SignerOptions{}).WithType("JWT")
signer, err := jose.NewSigner(jose.SigningKey{Algorithm: jose.RS256, Key: state.Signer}, signerOptions)
if err != nil {
return "", err
}
issuer := state.idpGetIssuer()
authToken := authInfoJWT{Issuer: issuer, Subject: username,
Audience: []string{issuer}, AuthType: authLevel, TokenType: "keymaster_auth"}
authToken.NotBefore = time.Now().Unix()
authToken.IssuedAt = authToken.NotBefore
authToken.Expiration = authToken.IssuedAt + durationSeconds
return jwt.Signed(signer).Claims(authToken).CompactSerialize()
}
func (state *RuntimeState) getAuthInfoFromAuthJWT(serializedToken string) (
rvalue authInfo, err error) {
return state.getAuthInfoFromJWT(serializedToken, "keymaster_auth")
}
func (state *RuntimeState) getAuthInfoFromJWT(serializedToken,
tokenType string) (rvalue authInfo, err error) {
tok, err := jwt.ParseSigned(serializedToken)
if err != nil {
return rvalue, err
}
inboundJWT := authInfoJWT{}
if err := state.JWTClaims(tok, &inboundJWT); err != nil {
logger.Printf("err=%s", err)
return rvalue, err
}
//At this stage is now crypto verified, now is time to verify sane values
issuer := state.idpGetIssuer()
if inboundJWT.Issuer != issuer || inboundJWT.TokenType != tokenType ||
len(inboundJWT.Audience) < 1 || inboundJWT.Audience[0] != issuer ||
inboundJWT.NotBefore > time.Now().Unix() {
err = errors.New("invalid JWT values")
return rvalue, err
}
rvalue.AuthType = inboundJWT.AuthType
rvalue.ExpiresAt = time.Unix(inboundJWT.Expiration, 0)
rvalue.IssuedAt = time.Unix(inboundJWT.IssuedAt, 0)
rvalue.Username = inboundJWT.Subject
return rvalue, nil
}
func (state *RuntimeState) updateAuthJWTWithNewAuthLevel(intoken string, newAuthLevel int) (string, error) {
signerOptions := (&jose.SignerOptions{}).WithType("JWT")
signer, err := jose.NewSigner(jose.SigningKey{Algorithm: jose.RS256, Key: state.Signer}, signerOptions)
if err != nil {
return "", err
}
tok, err := jwt.ParseSigned(intoken)
if err != nil {
return "", err
}
parsedJWT := authInfoJWT{}
if err := state.JWTClaims(tok, &parsedJWT); err != nil {
logger.Printf("err=%s", err)
return "", err
}
issuer := state.idpGetIssuer()
if parsedJWT.Issuer != issuer || parsedJWT.TokenType != "keymaster_auth" ||
len(parsedJWT.Audience) < 1 || parsedJWT.Audience[0] != issuer ||
parsedJWT.NotBefore > time.Now().Unix() {
err = errors.New("invalid JWT values")
return "", err
}
parsedJWT.AuthType = newAuthLevel
return jwt.Signed(signer).Claims(parsedJWT).CompactSerialize()
}
func (state *RuntimeState) genNewSerializedStorageStringDataJWT(username string, dataType int, data string, expiration int64) (string, error) {
signerOptions := (&jose.SignerOptions{}).WithType("JWT")
signer, err := jose.NewSigner(jose.SigningKey{Algorithm: jose.RS256, Key: state.Signer}, signerOptions)
if err != nil {
return "", err
}
issuer := state.idpGetIssuer()
storageToken := storageStringDataJWT{Issuer: issuer, Subject: username,
Audience: []string{issuer}, DataType: dataType,
TokenType: "storage_data", Data: data}
storageToken.NotBefore = time.Now().Unix()
storageToken.IssuedAt = storageToken.NotBefore
storageToken.Expiration = expiration
return jwt.Signed(signer).Claims(storageToken).CompactSerialize()
}
func (state *RuntimeState) getStorageDataFromStorageStringDataJWT(serializedToken string) (rvalue storageStringDataJWT, err error) {
tok, err := jwt.ParseSigned(serializedToken)
if err != nil {
return rvalue, err
}
inboundJWT := storageStringDataJWT{}
if err := state.JWTClaims(tok, &inboundJWT); err != nil {
logger.Printf("err=%s", err)
return rvalue, err
}
// At this stage crypto has been verified (data actually comes from a valid signer),
// Now is time to do semantic validation
issuer := state.idpGetIssuer()
if inboundJWT.Issuer != issuer || inboundJWT.TokenType != "storage_data" ||
len(inboundJWT.Audience) < 1 || inboundJWT.Audience[0] != issuer ||
inboundJWT.NotBefore > time.Now().Unix() {
err = errors.New("invalid JWT values")
return rvalue, err
}
return inboundJWT, nil
}