Use newest CRL.
If two CRLs are equivalent then use the one with a later lastUpdate field:
this will result in the newest CRL available being used.
(Imported from upstream's 325da8231c8d441e6bb7f15d1a5a23ff63c842e5 and
3dc160e9be6dcaeec9345fbb61b1c427d7026103.)
Change-Id: I8c722663b979dfe08728d091697d8b8204dc265c
Reviewed-on: https://boringssl-review.googlesource.com/8947
Commit-Queue: David Benjamin <davidben@google.com>
Reviewed-by: Adam Langley <agl@google.com>
Commit-Queue: Adam Langley <agl@google.com>
CQ-Verified: CQ bot account: commit-bot@chromium.org <commit-bot@chromium.org>
diff --git a/crypto/x509/x509_vfy.c b/crypto/x509/x509_vfy.c
index 7363ec6..8d51703 100644
--- a/crypto/x509/x509_vfy.c
+++ b/crypto/x509/x509_vfy.c
@@ -1001,13 +1001,25 @@
crl = sk_X509_CRL_value(crls, i);
reasons = *preasons;
crl_score = get_crl_score(ctx, &crl_issuer, &reasons, crl, x);
-
- if (crl_score > best_score) {
- best_crl = crl;
- best_crl_issuer = crl_issuer;
- best_score = crl_score;
- best_reasons = reasons;
+ if (crl_score < best_score)
+ continue;
+ /* If current CRL is equivalent use it if it is newer */
+ if (crl_score == best_score) {
+ int day, sec;
+ if (ASN1_TIME_diff(&day, &sec, X509_CRL_get_lastUpdate(best_crl),
+ X509_CRL_get_lastUpdate(crl)) == 0)
+ continue;
+ /*
+ * ASN1_TIME_diff never returns inconsistent signs for |day|
+ * and |sec|.
+ */
+ if (day <= 0 && sec <= 0)
+ continue;
}
+ best_crl = crl;
+ best_crl_issuer = crl_issuer;
+ best_score = crl_score;
+ best_reasons = reasons;
}
if (best_crl) {
