+/* Check CRL times against values in X509_STORE_CTX */
+
+static int check_crl_time(X509_STORE_CTX *ctx, X509_CRL *crl, int notify)
+ {
+ time_t *ptime;
+ int i;
+ ctx->current_crl = crl;
+ if (ctx->param->flags & X509_V_FLAG_USE_CHECK_TIME)
+ ptime = &ctx->param->check_time;
+ else
+ ptime = NULL;
+
+ i=X509_cmp_time(X509_CRL_get_lastUpdate(crl), ptime);
+ if (i == 0)
+ {
+ ctx->error=X509_V_ERR_ERROR_IN_CRL_LAST_UPDATE_FIELD;
+ if (!notify || !ctx->verify_cb(0, ctx))
+ return 0;
+ }
+
+ if (i > 0)
+ {
+ ctx->error=X509_V_ERR_CRL_NOT_YET_VALID;
+ if (!notify || !ctx->verify_cb(0, ctx))
+ return 0;
+ }
+
+ if(X509_CRL_get_nextUpdate(crl))
+ {
+ i=X509_cmp_time(X509_CRL_get_nextUpdate(crl), ptime);
+
+ if (i == 0)
+ {
+ ctx->error=X509_V_ERR_ERROR_IN_CRL_NEXT_UPDATE_FIELD;
+ if (!notify || !ctx->verify_cb(0, ctx))
+ return 0;
+ }
+
+ if (i < 0)
+ {
+ ctx->error=X509_V_ERR_CRL_HAS_EXPIRED;
+ if (!notify || !ctx->verify_cb(0, ctx))
+ return 0;
+ }
+ }
+
+ ctx->current_crl = NULL;
+
+ return 1;
+ }
+
+/* Lookup CRLs from the supplied list. Look for matching isser name
+ * and validity. If we can't find a valid CRL return the last one
+ * with matching name. This gives more meaningful error codes. Otherwise
+ * we'd get a CRL not found error if a CRL existed with matching name but
+ * was invalid.
+ */
+
+static int get_crl_sk(X509_STORE_CTX *ctx, X509_CRL **pcrl,
+ X509_NAME *nm, STACK_OF(X509_CRL) *crls)
+ {
+ int i;
+ X509_CRL *crl, *best_crl = NULL;
+ for (i = 0; i < sk_X509_CRL_num(crls); i++)
+ {
+ crl = sk_X509_CRL_value(crls, i);
+ if (X509_NAME_cmp(nm, X509_CRL_get_issuer(crl)))
+ continue;
+ if (check_crl_time(ctx, crl, 0))
+ {
+ *pcrl = crl;
+ CRYPTO_add(&crl->references, 1, CRYPTO_LOCK_X509);
+ return 1;
+ }
+ best_crl = crl;
+ }
+ if (best_crl)
+ {
+ *pcrl = best_crl;
+ CRYPTO_add(&best_crl->references, 1, CRYPTO_LOCK_X509);
+ }
+
+ return 0;
+ }
+