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| author | Peter Dettman <peter.dettman@bouncycastle.org> | 2023-07-05 09:48:49 +0700 |
|---|---|---|
| committer | Peter Dettman <peter.dettman@bouncycastle.org> | 2023-07-05 09:48:49 +0700 |
| commit | ac7670aa24f4be8b3d1c89db53c6e7c598b86dea (patch) | |
| tree | 5ec0ddd5a4d0134a1239d6f76127b72ddd8eb591 /crypto/src | |
| parent | Add TlsClient.ShouldUseCompatibilityMode (diff) | |
| download | BouncyCastle.NET-ed25519-ac7670aa24f4be8b3d1c89db53c6e7c598b86dea.tar.xz | |
TLS: extra client validation of ServerHello parameters
Diffstat (limited to 'crypto/src')
| -rw-r--r-- | crypto/src/tls/TlsClientProtocol.cs | 13 |
1 files changed, 12 insertions, 1 deletions
diff --git a/crypto/src/tls/TlsClientProtocol.cs b/crypto/src/tls/TlsClientProtocol.cs index 99d088622..cff541db3 100644 --- a/crypto/src/tls/TlsClientProtocol.cs +++ b/crypto/src/tls/TlsClientProtocol.cs @@ -1112,6 +1112,16 @@ namespace Org.BouncyCastle.Tls m_tlsClient.NotifySessionID(selectedSessionID); securityParameters.m_resumedSession = selectedSessionID.Length > 0 && m_tlsSession != null && Arrays.AreEqual(selectedSessionID, m_tlsSession.SessionID); + + if (securityParameters.IsResumedSession) + { + if (serverHello.CipherSuite != m_sessionParameters.CipherSuite || + !securityParameters.NegotiatedVersion.Equals(m_sessionParameters.NegotiatedVersion)) + { + throw new TlsFatalAlert(AlertDescription.illegal_parameter, + "ServerHello parameters do not match resumed session"); + } + } } /* @@ -1124,7 +1134,8 @@ namespace Org.BouncyCastle.Tls if (!TlsUtilities.IsValidCipherSuiteSelection(offeredCipherSuites, cipherSuite) || !TlsUtilities.IsValidVersionForCipherSuite(cipherSuite, securityParameters.NegotiatedVersion)) { - throw new TlsFatalAlert(AlertDescription.illegal_parameter); + throw new TlsFatalAlert(AlertDescription.illegal_parameter, + "ServerHello selected invalid cipher suite"); } TlsUtilities.NegotiatedCipherSuite(securityParameters, cipherSuite); |