From f6e7d014508b020818707d4b1544379e8b742e32 Mon Sep 17 00:00:00 2001
From: "Dr. Stephen Henson" <steve@openssl.org>
Date: Tue, 25 Jul 2006 17:39:38 +0000
Subject: [PATCH] Support for multiple CRLs with same issuer name in
 X509_STORE. Modify verify logic to try to use an unexpired CRL if possible.

---
 CHANGES                |  4 ++++
 apps/ca.c              | 19 ++++++++++++++++---
 crypto/x509/x509.h     |  1 +
 crypto/x509/x509_lu.c  | 15 +++++++++++++--
 crypto/x509/x509_vfy.c | 33 ++++++++++++++++++++++++++++++++-
 5 files changed, 66 insertions(+), 6 deletions(-)

diff --git a/CHANGES b/CHANGES
index 96f2fbdd09..2fe0ca88c6 100644
--- a/CHANGES
+++ b/CHANGES
@@ -4,6 +4,10 @@
 
  Changes between 0.9.8b and 0.9.9  [xx XXX xxxx]
 
+  *) Allow multiple CRLs to exist in an X509_STORE with matching issuer names.
+     Modify get_crl() to find a valid (unexpired) CRL if possible.
+     [Steve Henson]
+
   *) New function X509_CRL_match() to check if two CRLs are identical. Normally
      this would be called X509_CRL_cmp() but that name is already used by
      a function that just compares CRL issuer names. Cache several CRL 
diff --git a/apps/ca.c b/apps/ca.c
index 9fde400f69..d0fa3d772e 100644
--- a/apps/ca.c
+++ b/apps/ca.c
@@ -258,6 +258,7 @@ int MAIN(int argc, char **argv)
 	int doupdatedb=0;
 	long crldays=0;
 	long crlhours=0;
+	long crlsec=0;
 	long errorline= -1;
 	char *configfile=NULL;
 	char *md=NULL;
@@ -456,6 +457,11 @@ EF_ALIGNMENT=0;
 			if (--argc < 1) goto bad;
 			crlhours= atol(*(++argv));
 			}
+		else if (strcmp(*argv,"-crlsec") == 0)
+			{
+			if (--argc < 1) goto bad;
+			crlsec = atol(*(++argv));
+			}
 		else if (strcmp(*argv,"-infiles") == 0)
 			{
 			argc--;
@@ -1367,7 +1373,7 @@ bad:
 				goto err;
 				}
 
-		if (!crldays && !crlhours)
+		if (!crldays && !crlhours && !crlsec)
 			{
 			if (!NCONF_get_number(conf,section,
 				ENV_DEFAULT_CRL_DAYS, &crldays))
@@ -1376,7 +1382,7 @@ bad:
 				ENV_DEFAULT_CRL_HOURS, &crlhours))
 				crlhours = 0;
 			}
-		if ((crldays == 0) && (crlhours == 0))
+		if ((crldays == 0) && (crlhours == 0) && (crlsec == 0))
 			{
 			BIO_printf(bio_err,"cannot lookup how long until the next CRL is issued\n");
 			goto err;
@@ -1390,7 +1396,7 @@ bad:
 		if (!tmptm) goto err;
 		X509_gmtime_adj(tmptm,0);
 		X509_CRL_set_lastUpdate(crl, tmptm);	
-		X509_gmtime_adj(tmptm,(crldays*24+crlhours)*60*60);
+		X509_gmtime_adj(tmptm,(crldays*24+crlhours)*60*60 + crlsec);
 		X509_CRL_set_nextUpdate(crl, tmptm);	
 
 		ASN1_TIME_free(tmptm);
@@ -1455,6 +1461,12 @@ bad:
 		if (crlnumberfile != NULL)	/* we have a CRL number that need updating */
 			if (!save_serial(crlnumberfile,"new",crlnumber,NULL)) goto err;
 
+		if (crlnumber)
+			{
+			BN_free(crlnumber);
+			crlnumber = NULL;
+			}
+
 		if (!X509_CRL_sign(crl,pkey,dgst)) goto err;
 
 		PEM_write_bio_X509_CRL(Sout,crl);
@@ -1507,6 +1519,7 @@ err:
 	if (free_key && key)
 		OPENSSL_free(key);
 	BN_free(serial);
+	BN_free(crlnumber);
 	free_index(db);
 	EVP_PKEY_free(pkey);
 	if (x509) X509_free(x509);
diff --git a/crypto/x509/x509.h b/crypto/x509/x509.h
index ac5e4b60e4..31bc7539bf 100644
--- a/crypto/x509/x509.h
+++ b/crypto/x509/x509.h
@@ -1072,6 +1072,7 @@ int		X509_NAME_cmp(const X509_NAME *a, const X509_NAME *b);
 unsigned long	X509_NAME_hash(X509_NAME *x);
 
 int		X509_CRL_cmp(const X509_CRL *a, const X509_CRL *b);
+int		X509_CRL_match(const X509_CRL *a, const X509_CRL *b);
 #ifndef OPENSSL_NO_FP_API
 int		X509_print_ex_fp(FILE *bp,X509 *x, unsigned long nmflag, unsigned long cflag);
 int		X509_print_fp(FILE *bp,X509 *x);
diff --git a/crypto/x509/x509_lu.c b/crypto/x509/x509_lu.c
index cd2cfb6d85..fbb1497fe2 100644
--- a/crypto/x509/x509_lu.c
+++ b/crypto/x509/x509_lu.c
@@ -459,13 +459,24 @@ X509_OBJECT *X509_OBJECT_retrieve_match(STACK_OF(X509_OBJECT) *h, X509_OBJECT *x
 	X509_OBJECT *obj;
 	idx = sk_X509_OBJECT_find(h, x);
 	if (idx == -1) return NULL;
-	if (x->type != X509_LU_X509) return sk_X509_OBJECT_value(h, idx);
+	if ((x->type != X509_LU_X509) && (x->type != X509_LU_CRL))
+		return sk_X509_OBJECT_value(h, idx);
 	for (i = idx; i < sk_X509_OBJECT_num(h); i++)
 		{
 		obj = sk_X509_OBJECT_value(h, i);
 		if (x509_object_cmp((const X509_OBJECT **)&obj, (const X509_OBJECT **)&x))
 			return NULL;
-		if ((x->type != X509_LU_X509) || !X509_cmp(obj->data.x509, x->data.x509))
+		if (x->type == X509_LU_X509)
+			{
+			if (!X509_cmp(obj->data.x509, x->data.x509))
+				return obj;
+			}
+		else if (x->type == X509_LU_CRL)
+			{
+			if (!X509_CRL_match(obj->data.crl, x->data.crl))
+				return obj;
+			}
+		else
 			return obj;
 		}
 	return NULL;
diff --git a/crypto/x509/x509_vfy.c b/crypto/x509/x509_vfy.c
index 79dae3d3bf..e2109a4c35 100644
--- a/crypto/x509/x509_vfy.c
+++ b/crypto/x509/x509_vfy.c
@@ -713,7 +713,38 @@ static int get_crl(X509_STORE_CTX *ctx, X509_CRL **pcrl, X509 *x)
 		return 0;
 		}
 
-	*pcrl = xobj.data.crl;
+	/* If CRL times not valid look through store */
+	if (!check_crl_time(ctx, xobj.data.crl, 0))
+		{
+		int idx, i;
+		X509_OBJECT *pobj;
+		X509_OBJECT_free_contents(&xobj);
+		idx = X509_OBJECT_idx_by_subject(ctx->ctx->objs,
+							X509_LU_CRL, nm);
+		if (idx == -1)
+			return 0;
+		*pcrl = NULL;
+		for (i = idx; i < sk_X509_OBJECT_num(ctx->ctx->objs); i++)
+			{
+			pobj = sk_X509_OBJECT_value(ctx->ctx->objs, i);
+			/* Check to see if it is a CRL and issuer matches */
+			if (pobj->type != X509_LU_CRL)
+				break;
+			if (X509_NAME_cmp(nm,
+					X509_CRL_get_issuer(pobj->data.crl)))
+				break;
+			/* Set *pcrl because the CRL will either be valid or
+			 * a "best fit" CRL.
+			 */
+			*pcrl = pobj->data.crl;
+			if (check_crl_time(ctx, *pcrl, 0))
+				break;
+			}
+		if (*pcrl)
+			CRYPTO_add(&(*pcrl)->references, 1, CRYPTO_LOCK_X509);
+		}
+	else 
+		*pcrl = xobj.data.crl;
 	if (crl)
 		X509_CRL_free(crl);
 	return 1;
-- 
2.25.1