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Add X.509 formatting validation to SECURITY.md

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Clarify that strict formatting of X.509 certificates is not checked by
Mbed TLS and that it therefore should not be used to construct a CA.

Signed-off-by: David Horstmann <david.horstmann@arm.com>
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David Horstmann 2025-01-22 14:27:22 +00:00
parent 5a77c230b1
commit 2fe0da7947
1 changed files with 14 additions and 0 deletions
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SECURITY.md
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@ -144,3 +144,17 @@ Policy](https://github.com/hacl-star/hacl-star/blob/main/SECURITY.md).)
The Everest variant is only used when `MBEDTLS_ECDH_VARIANT_EVEREST_ENABLED`
configuration option is defined. This option is off by default.
#### Formatting of X.509 certificates and certificate signing requests
When parsing X.509 certificates and certificate signing requests (CSRs),
Mbed TLS does not check that they are strictly compliant with X.509 and other
relevant standards. In the case of signed certificates, the signing party is
assumed to have performed this validation (and the certificate is trusted to
be correctly formatted as long as the signature is correct).
Similarly, CSRs are implicitly trusted by Mbed TLS to be standards-compliant.
**Warning!** Mbed TLS must not be used to sign untrusted CSRs unless extra
validation is performed separately to ensure that they are compliant to the
relevant specifications. This makes Mbed TLS on its own unsuitable use in a
Certificate Authority (CA).