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token.go
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token.go
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package config
import (
"errors"
"fmt"
"time"
"github.com/dgrijalva/jwt-go"
"github.com/kiali/kiali/util"
)
// Structured version of Claims Section, as referenced at
// https://tools.ietf.org/html/rfc7519#section-4.1
// See examples for how to use this with your own claim types
type IanaClaims struct {
SessionId string `json:"sid,omitempty"`
jwt.StandardClaims
}
type TokenGenerated struct {
Username string `json:"username"`
Token string `json:"token"`
ExpiresOn time.Time `json:"expiresOn"`
}
func GetSignedTokenString(claims jwt.Claims) (string, error) {
token := jwt.NewWithClaims(jwt.SigningMethodHS256, claims)
ss, err := token.SignedString(Get().LoginToken.SigningKey)
if err != nil {
return "", err
}
return ss, nil
}
// GenerateToken generates a signed token with an expiration of <ExpirationSeconds> seconds
func GenerateToken(username string) (TokenGenerated, error) {
timeExpire := util.Clock.Now().Add(time.Second * time.Duration(Get().LoginToken.ExpirationSeconds))
claim := IanaClaims{
StandardClaims: jwt.StandardClaims{
Subject: username,
ExpiresAt: timeExpire.Unix(),
Issuer: AuthStrategyLoginIssuer,
},
}
ss, err := GetSignedTokenString(claim)
if err != nil {
return TokenGenerated{}, err
}
return TokenGenerated{Token: ss, ExpiresOn: timeExpire, Username: username}, nil
}
// ValidateToken checks if the input token is still valid
func ValidateToken(tokenString string) (string, error) {
claims, err := GetTokenClaimsIfValid(tokenString)
if err != nil {
return "", err
}
return claims.Subject, nil
}
func GetTokenClaimsIfValid(tokenString string) (*IanaClaims, error) {
token, err := jwt.ParseWithClaims(tokenString, &IanaClaims{}, func(token *jwt.Token) (interface{}, error) {
return Get().LoginToken.SigningKey, nil
})
if err != nil {
return nil, err
}
if _, ok := token.Method.(*jwt.SigningMethodHMAC); !ok {
return nil, fmt.Errorf("Unexpected signing method: %s", token.Header["alg"])
}
if token.Valid {
cfg := Get()
claims := token.Claims.(*IanaClaims)
if claims.Issuer != AuthStrategyLoginIssuer && claims.Issuer != AuthStrategyOpenshiftIssuer {
return nil, errors.New("token has invalid issuer (auth strategy)")
}
if claims.Issuer == AuthStrategyLoginIssuer && cfg.Auth.Strategy != AuthStrategyLogin {
return nil, errors.New("token is invalid because of authentication strategy mismatch")
}
if claims.Issuer == AuthStrategyOpenshiftIssuer && cfg.Auth.Strategy != AuthStrategyOpenshift {
return nil, errors.New("token is invalid because of authentication strategy mismatch")
}
return token.Claims.(*IanaClaims), nil
}
return nil, errors.New("Invalid token")
}