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X.509: Allow X.509 certs to be blacklisted

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Allow X.509 certs to be blacklisted based on their TBSCertificate hash.
This is convenient since we have to determine this anyway to be able to
check the signature on an X.509 certificate.  This is also what UEFI uses
in its blacklist.

If a certificate built into the kernel is blacklisted, something like the
following might then be seen during boot:

	X.509: Cert 123412341234c55c1dcc601ab8e172917706aa32fb5eaf826813547fdf02dd46 is blacklisted
	Problem loading in-kernel X.509 certificate (-129)

where the hex string shown is the blacklisted hash.

Signed-off-by: David Howells <dhowells@redhat.com>
This commit is contained in:
David Howells 2017-04-03 16:07:25 +01:00
parent 734114f878
commit 436529562d
2 changed files with 16 additions and 0 deletions
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1
crypto/asymmetric_keys/x509_parser.h
View file

@ -42,6 +42,7 @@ struct x509_certificate {
bool self_signed; /* T if self-signed (check unsupported_sig too) */
bool unsupported_key; /* T if key uses unsupported crypto */
bool unsupported_sig; /* T if signature uses unsupported crypto */
bool blacklisted;
};
/*

15
crypto/asymmetric_keys/x509_public_key.c
View file

@ -84,6 +84,16 @@ int x509_get_sig_params(struct x509_certificate *cert)
goto error_2;
might_sleep();
ret = crypto_shash_finup(desc, cert->tbs, cert->tbs_size, sig->digest);
if (ret < 0)
goto error_2;
ret = is_hash_blacklisted(sig->digest, sig->digest_size, "tbs");
if (ret == -EKEYREJECTED) {
pr_err("Cert %*phN is blacklisted\n",
sig->digest_size, sig->digest);
cert->blacklisted = true;
ret = 0;
}
error_2:
kfree(desc);
@ -186,6 +196,11 @@ static int x509_key_preparse(struct key_preparsed_payload *prep)
cert->sig->pkey_algo, cert->sig->hash_algo);
}
/* Don't permit addition of blacklisted keys */
ret = -EKEYREJECTED;
if (cert->blacklisted)
goto error_free_cert;
/* Propose a description */
sulen = strlen(cert->subject);
if (cert->raw_skid) {