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check Application URI of the server Certificate on OpenSecureChannel #2583

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merged 3 commits into from May 2, 2024
Merged

check Application URI of the server Certificate on OpenSecureChannel #2583

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f64b5df
check Application URI of the server Certificate on OpenSecureChannel
romanett Apr 11, 2024
f832cae
cleanup
romanett Apr 11, 2024
c925e68
also throw when no Application URI is specified in the Endpoint descr…
romanett Apr 12, 2024
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23 changes: 23 additions & 0 deletions Libraries/Opc.Ua.Client/Session.cs
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Expand Up @@ -2319,6 +2319,7 @@

if (requireEncryption)
{
ValidateServerCertificateApplicationUri(serverCertificate);
if (checkDomain)
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technically the spec outlines to check the responses, but since the cert in the response is already binary compared to this one this is a good place to catch a misaligned application uri before connection! 👍🏼

{
m_configuration.CertificateValidator.Validate(serverCertificateChain, m_endpoint);
Expand Down Expand Up @@ -5264,6 +5265,28 @@
!String.IsNullOrEmpty(identityPolicy.SecurityPolicyUri);
}
}
/// <summary>
/// Validates the ServerCertificate ApplicationUri to match the ApplicationUri of the Endpoint for an open call (Spec Part 4 5.4.1)
/// </summary>
private void ValidateServerCertificateApplicationUri(
X509Certificate2 serverCertificate)
{
var applicationUri = m_endpoint?.Description?.Server?.ApplicationUri;
//check is only neccessary if the ApplicatioUri is specified for the Endpoint
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if (string.IsNullOrEmpty(applicationUri))
{
throw ServiceResultException.Create(
StatusCodes.BadSecurityChecksFailed,
"No ApplicationUri is specified for the server in the EndpointDescription.");

Check warning on line 5280 in Libraries/Opc.Ua.Client/Session.cs

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Libraries/Opc.Ua.Client/Session.cs#L5278-L5280 

Added lines #L5278 - L5280 were not covered by tests
}
string certificateApplicationUri = X509Utils.GetApplicationUriFromCertificate(serverCertificate);
if (!string.Equals(certificateApplicationUri, applicationUri, StringComparison.Ordinal))
{
throw ServiceResultException.Create(
StatusCodes.BadSecurityChecksFailed,
"Server did not return a Certificate matching the ApplicationUri specified in the EndpointDescription.");

Check warning on line 5287 in Libraries/Opc.Ua.Client/Session.cs

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Added lines #L5285 - L5287 were not covered by tests
}
}

private void BuildCertificateData(out byte[] clientCertificateData, out byte[] clientCertificateChainData)
{
Expand Down
1 change: 1 addition & 0 deletions Libraries/Opc.Ua.Client/SessionAsync.cs
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Expand Up @@ -93,6 +93,7 @@ public partial class Session : SessionClientBatched, ISession

if (requireEncryption)
{
ValidateServerCertificateApplicationUri(serverCertificate);
if (checkDomain)
{
await m_configuration.CertificateValidator.ValidateAsync(serverCertificateChain, m_endpoint, ct).ConfigureAwait(false);
Expand Down