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In a TLS client, when using certificate authentication, the client should check that the certificate is valid for the server name that the client expects. Otherwise, in most scenarios, a malicious server can impersonate another server. Normally, the application code should call mbedtls_ssl_set_hostname(). However, it's easy to forget. So raise an error if mandatory certificate authentication is in effect and mbedtls_ssl_set_hostname() has not been called. Raise the new error code MBEDTLS_ERR_SSL_CERTIFICATE_VERIFICATION_WITHOUT_HOSTNAME, for easy identification. But don't raise the error if the backward compatibility option MBEDTLS_SSL_CLI_ALLOW_WEAK_CERTIFICATE_VERIFICATION_WITHOUT_HOSTNAME is enabled. Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com> |
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