public string CreateJWT(X509Certificate2 clientCertificate,
X509Certificate2[] caCertificates,
string publisherID,
string tenantName = null,
bool forSouthGate = false
)
{
SigningCredentials sigCreds = new SigningCredentials(new X509SecurityKey(clientCertificate),
SecurityAlgorithms.RsaSha256Signature
);
string tokenID = Guid.NewGuid()
.ToString();
JwtHeader jwtHeader = new JwtHeader(sigCreds);
jwtHeader.Clear();
jwtHeader.Add("alg", "RS256");
/* The "x5c" (X.509 certificate chain) Header Parameter contains the
* X.509 public key certificate or certificate chain [RFC5280]
* corresponding to the key used to digitally sign the JWS. The
* certificate or certificate chain is represented as a JSON array of
* certificate value strings. Each string in the array is a
* base64-encoded (Section 4 of [RFC4648] -- not base64url-encoded) DER
* [ITU.X690.2008] PKIX certificate value. The certificate containing
* the public key corresponding to the key used to digitally sign the
* JWS MUST be the first certificate. This MAY be followed by
* additional certificates, with each subsequent certificate being the
* one used to certify the previous one. The recipient MUST validate
* the certificate chain according to RFC 5280 [RFC5280] and consider
* the certificate or certificate chain to be invalid if any validation
* failure occurs. Use of this Header Parameter is OPTIONAL.
*/
List <string> exportedCerts = new List <string>();
exportedCerts.Add(ExportToPEM(clientCertificate));
foreach (X509Certificate2 caCert in caCertificates)
{
exportedCerts.Add(ExportToPEM(caCert));
}
jwtHeader.Add("x5c", exportedCerts.ToArray());
jwtHeader.Add("typ", "JWT");
JwtPayload jwtPayload = new JwtPayload(new List <Claim>
{
new Claim("jti", tokenID), // Unique Token ID
new Claim("sub", publisherID), // Publisher ID
new Claim("ten",
string.IsNullOrEmpty(tenantName) ? "MQTTbroker" : tenantName
), // Will not be used by broker, but must be present in Mindsphere
new Claim("iss", publisherID) // Issuer
}
);
DateTime utcNow = DateTime.UtcNow;
DateTime validity = utcNow.AddMinutes(30);
DateTime unixTime = new DateTime(1970, 1, 1, 0, 0, 0, DateTimeKind.Utc);
int iat = (int)Math.Floor(utcNow.Subtract(unixTime)
.TotalSeconds
);
int exp = (int)Math.Floor(validity.Subtract(unixTime)
.TotalSeconds
);
//jwtPayload.Add("nbf", iat); // not valid before
jwtPayload.Add("exp", exp); // valid until
jwtPayload.Add("iat", iat); // issue time
jwtPayload.Add("aud",
new List <string>
{
forSouthGate ? "southgate" : "MQTTBroker"
}
);
jwtPayload.Add("schemas",
new List <string>
{
"urn:siemens:mindsphere:v1"
}
);
JwtSecurityToken securityToken = new JwtSecurityToken(jwtHeader, jwtPayload);
JwtSecurityTokenHandler jwtSecurityTokenHandler = new JwtSecurityTokenHandler();
string jwt = jwtSecurityTokenHandler.WriteToken(securityToken);
return(jwt);
}