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Changelog entries for requiring mbedls_ssl_set_hostname() in TLS clients

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Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>
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Gilles Peskine 2025-02-17 17:49:20 +01:00
parent 11f74c5751
commit 20c7748575
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18
ChangeLog.d/mbedtls_ssl_set_hostname.txt Normal file
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Default behavior changes
* In TLS clients, if mbedtls_ssl_set_hostname() has not been called,
mbedtls_ssl_handshake() now fails with
MBEDTLS_ERR_SSL_CERTIFICATE_VERIFICATION_WITHOUT_HOSTNAME
if certificate-based authentication of the server is attempted.
This is because authenticating a server without knowing what name
to expect is usually insecure. To restore the old behavior, either
call mbedtls_ssl_set_hostname() with NULL as the hostname, or
enable the new compile-time option
MBEDTLS_SSL_CLI_ALLOW_WEAK_CERTIFICATE_VERIFICATION_WITHOUT_HOSTNAME.
Security
* Note that TLS clients should generally call mbedtls_ssl_set_hostname()
if they use certificate authentication (i.e. not pre-shared keys).
Otherwise, in many scenarios, the server could be impersonated.
The library will now prevent the handshake and return
MBEDTLS_ERR_SSL_CERTIFICATE_VERIFICATION_WITHOUT_HOSTNAME
if mbedtls_ssl_set_hostname() has not been called.