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Create configuration option to bypass the mbedtls_ssl_set_hostname check

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Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>
This commit is contained in:
Gilles Peskine
2025-02-13 13:46:58 +01:00
parent 0178dc9946
commit 7656ad7b9f
3 changed files with 44 additions and 0 deletions
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40
include/mbedtls/mbedtls_config.h
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@ -1622,6 +1622,46 @@
*/
//#define MBEDTLS_SSL_ASYNC_PRIVATE
/** \def MBEDTLS_SSL_CLI_ALLOW_WEAK_CERTIFICATE_VERIFICATION_WITHOUT_HOSTNAME
*
* In TLS clients, when a client authenticates a server through its
* certificate, the client normally checks three things:
* - the certificate chain must be valid;
* - the chain must start from a trusted CA;
* - the certificate must cover the server name that is expected by the client.
*
* Omitting any of these checks is generally insecure, and can allow a
* malicious server to impersonate a legitimate server.
*
* The third check may be safely skipped in some unusual scenarios,
* such as networks where eavesdropping is a risk but not active attacks,
* or a private PKI where the client equally trusts all servers that are
* accredited by the root CA.
*
* You should call mbedtls_ssl_set_hostname() with the expected server name
* before starting a TLS handshake on a client (unless the client is
* set up to only use PSK-based authentication, which does not rely on the
* host name). This configuration option controls what happens if a TLS client
* is configured with the authentication mode #MBEDTLS_SSL_VERIFY_REQUIRED
* (default), certificate authentication is enabled and the client does not
* call mbedtls_ssl_set_hostname():
*
* - If this option is unset (default), the connection attempt is aborted
* with the error #MBEDTLS_ERR_SSL_CERTIFICATE_VERIFICATION_WITHOUT_HOSTNAME.
* - If this option is set, the TLS library does not check the server name
* that the certificate is valid for. This is the historical behavior
* of Mbed TLS, but may be insecure as explained above.
*
* Enable this option for strict backward compatibility if you have
* determined that it is secure in the scenario where you are using
* Mbed TLS.
*
* \deprecated This option exists only for backward compatibility and will
* be removed in the next major version of Mbed TLS.
*
*/
//#define MBEDTLS_SSL_CLI_ALLOW_WEAK_CERTIFICATE_VERIFICATION_WITHOUT_HOSTNAME
/**
* \def MBEDTLS_SSL_CONTEXT_SERIALIZATION
*

3
include/mbedtls/ssl.h
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@ -197,6 +197,9 @@
* #MBEDTLS_SSL_VERIFY_REQUIRED (default).
* - Certificate authentication is enabled.
* - The client does not call mbedtls_ssl_set_hostname().
* - The configuration option
* #MBEDTLS_SSL_CLI_ALLOW_WEAK_CERTIFICATE_VERIFICATION_WITHOUT_HOSTNAME
* is not enabled.
*/
#define MBEDTLS_ERR_SSL_CERTIFICATE_VERIFICATION_WITHOUT_HOSTNAME -0x5D80

1
scripts/config.py
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@ -229,6 +229,7 @@ def crypto_adapter(adapter):
DEPRECATED = frozenset([
'MBEDTLS_PSA_CRYPTO_SE_C',
'MBEDTLS_SSL_CLI_ALLOW_WEAK_CERTIFICATE_VERIFICATION_WITHOUT_HOSTNAME',
])
def no_deprecated_adapter(adapter):
"""Modify an adapter to disable deprecated symbols.