Separate the SCT List parser from the SCT List viewer

1 files changed, 172 insertions, 71 deletions

diff --git a/crypto/x509v3/v3_scts.c b/crypto/x509v3/v3_scts.c
index 457d5acaaa..3bf1579310 100644
--- a/crypto/x509v3/v3_scts.c
+++ b/crypto/x509v3/v3_scts.c
@@ -60,61 +60,88 @@
 #include "cryptlib.h"
 #include <openssl/asn1.h>
 #include <openssl/x509v3.h>
-#include <openssl/bn.h>
 #include "../ssl/ssl_locl.h"
 
 #if (defined(_WIN32) || defined(_WIN64)) && !defined(__MINGW32__)
-#define SCTS_TIMESTAMP unsigned __int64
+#define SCT_TIMESTAMP unsigned __int64
 #elif defined(__arch64__)
-#define SCTS_TIMESTAMP unsigned long
+#define SCT_TIMESTAMP unsigned long
 #else
-#define SCTS_TIMESTAMP unsigned long long
+#define SCT_TIMESTAMP unsigned long long
 #endif
 
-#define n2l8(c,l)	(l =((SCTS_TIMESTAMP)(*((c)++)))<<56, \
-			 l|=((SCTS_TIMESTAMP)(*((c)++)))<<48, \
-			 l|=((SCTS_TIMESTAMP)(*((c)++)))<<40, \
-			 l|=((SCTS_TIMESTAMP)(*((c)++)))<<32, \
-			 l|=((SCTS_TIMESTAMP)(*((c)++)))<<24, \
-			 l|=((SCTS_TIMESTAMP)(*((c)++)))<<16, \
-			 l|=((SCTS_TIMESTAMP)(*((c)++)))<< 8, \
-			 l|=((SCTS_TIMESTAMP)(*((c)++))))
+#define n2l8(c,l)	(l =((SCT_TIMESTAMP)(*((c)++)))<<56, \
+			 l|=((SCT_TIMESTAMP)(*((c)++)))<<48, \
+			 l|=((SCT_TIMESTAMP)(*((c)++)))<<40, \
+			 l|=((SCT_TIMESTAMP)(*((c)++)))<<32, \
+			 l|=((SCT_TIMESTAMP)(*((c)++)))<<24, \
+			 l|=((SCT_TIMESTAMP)(*((c)++)))<<16, \
+			 l|=((SCT_TIMESTAMP)(*((c)++)))<< 8, \
+			 l|=((SCT_TIMESTAMP)(*((c)++))))
 
+typedef struct SCT_st {
+	/* The encoded SCT */
+	unsigned char *sct;
+	unsigned short sctlen;
 
-static int i2r_scts(X509V3_EXT_METHOD *method, ASN1_OCTET_STRING *oct, BIO *out, int indent);
+	/* Components of the SCT.  "logid", "ext" and "sig" point to addresses
+	 * inside "sct".
+	 */
+	unsigned char version;
+	unsigned char* logid;
+	unsigned short logidlen;
+	SCT_TIMESTAMP timestamp;
+	unsigned char *ext;
+	unsigned short extlen;
+	unsigned char hash_alg;
+	unsigned char sig_alg;
+	unsigned char *sig;
+	unsigned short siglen;
+} SCT;
+
+DECLARE_STACK_OF(SCT)
+
+static void SCT_LIST_free(STACK_OF(SCT) *a);
+static STACK_OF(SCT) *d2i_SCT_LIST(STACK_OF(SCT) **a, const unsigned char **pp,
+				   long length);
+static int i2r_SCT_LIST(X509V3_EXT_METHOD *method, STACK_OF(SCT) *sct_list,
+			BIO *out, int indent);
 
 const X509V3_EXT_METHOD v3_ct_scts[] = {
-{ NID_ct_precert_scts, 0, ASN1_ITEM_ref(ASN1_OCTET_STRING),
-0,0,0,0,
+{ NID_ct_precert_scts, 0, NULL,
+0,(X509V3_EXT_FREE)SCT_LIST_free,
+(X509V3_EXT_D2I)d2i_SCT_LIST, 0,
 0,0,0,0,
-(X509V3_EXT_I2R)i2r_scts, NULL,
+(X509V3_EXT_I2R)i2r_SCT_LIST, 0,
 NULL},
 
-{ NID_ct_cert_scts, 0, ASN1_ITEM_ref(ASN1_OCTET_STRING),
+{ NID_ct_cert_scts, 0, NULL,
+0,(X509V3_EXT_FREE)SCT_LIST_free,
+(X509V3_EXT_D2I)d2i_SCT_LIST, 0,
 0,0,0,0,
-0,0,0,0,
-(X509V3_EXT_I2R)i2r_scts, NULL,
+(X509V3_EXT_I2R)i2r_SCT_LIST, 0,
 NULL},
 };
 
-static void tls12_signature_print(BIO *out, const unsigned char *data)
+static void tls12_signature_print(BIO *out, const unsigned char hash_alg,
+				  const unsigned char sig_alg)
 	{
 	int nid = NID_undef;
 	/* RFC6962 only permits two signature algorithms */
-	if (data[0] == TLSEXT_hash_sha256)
+	if (hash_alg == TLSEXT_hash_sha256)
 		{
-		if (data[1] == TLSEXT_signature_rsa)
+		if (sig_alg == TLSEXT_signature_rsa)
 			nid = NID_sha256WithRSAEncryption;
-		else if (data[1] == TLSEXT_signature_ecdsa)
+		else if (sig_alg == TLSEXT_signature_ecdsa)
 			nid = NID_ecdsa_with_SHA256;
 		}
 	if (nid == NID_undef)
-		BIO_printf(out, "%02X%02X", data[0], data[1]);
+		BIO_printf(out, "%02X%02X", hash_alg, sig_alg);
 	else
 		BIO_printf(out, "%s", OBJ_nid2ln(nid));
 	}
 
-static void timestamp_print(BIO *out, SCTS_TIMESTAMP timestamp)
+static void timestamp_print(BIO *out, SCT_TIMESTAMP timestamp)
 	{
 	ASN1_GENERALIZEDTIME *gen;
 	char genstr[20];
@@ -133,38 +160,72 @@ static void timestamp_print(BIO *out, SCTS_TIMESTAMP timestamp)
 	ASN1_GENERALIZEDTIME_free(gen);
 	}
 
-static int i2r_scts(X509V3_EXT_METHOD *method, ASN1_OCTET_STRING *oct,
-		       BIO *out, int indent)
+static void SCT_free(SCT *sct)
+	{
+	if (sct)
+		{
+		if (sct->sct) OPENSSL_free(sct->sct);
+		OPENSSL_free(sct);
+		}
+	}
+
+static void SCT_LIST_free(STACK_OF(SCT) *a)
+	{
+	sk_SCT_pop_free(a, SCT_free);
+	}
+
+static STACK_OF(SCT) *d2i_SCT_LIST(STACK_OF(SCT) **a, const unsigned char **pp,
+				   long length)
 	{
-	SCTS_TIMESTAMP timestamp;
-	unsigned char* data = oct->data;
+	ASN1_OCTET_STRING *oct = NULL;
+	STACK_OF(SCT) *sk = NULL;
+	SCT *sct;
+	unsigned char *p, *p2;
 	unsigned short listlen, sctlen = 0, fieldlen;
 
+	if (d2i_ASN1_OCTET_STRING(&oct, pp, length) == NULL)
+		return NULL;
 	if (oct->length < 2)
-		return 0;
-	n2s(data, listlen);
+		goto done;
+	p = oct->data;
+	n2s(p, listlen);
 	if (listlen != oct->length - 2)
-		return 0;
+		goto done;
+
+	if ((sk=sk_SCT_new_null()) == NULL)
+		goto done;
 
 	while (listlen > 0)
 		{
 		if (listlen < 2)
-			return 0;
-		n2s(data, sctlen);
+			goto err;
+		n2s(p, sctlen);
 		listlen -= 2;
 
 		if ((sctlen < 1) || (sctlen > listlen))
-			return 0;
+			goto err;
 		listlen -= sctlen;
 
-		BIO_printf(out, "%*sSigned Certificate Timestamp:", indent,
-			   "");
-		BIO_printf(out, "\n%*sVersion   : ", indent + 4, "");
-
-		if (*data == 0)		/* SCT v1 */
+		sct = OPENSSL_malloc(sizeof(SCT));
+		if (!sct)
+			goto err;
+		if (!sk_SCT_push(sk, sct))
 			{
-			BIO_printf(out, "v1(0)");
+			OPENSSL_free(sct);
+			goto err;
+			}
+
+		sct->sct = OPENSSL_malloc(sctlen);
+		if (!sct->sct)
+			goto err;
+		memcpy(sct->sct, p, sctlen);
+		sct->sctlen = sctlen;
+		p += sctlen;
+		p2 = sct->sct;
 
+		sct->version = *p2++;
+		if (sct->version == 0)		/* SCT v1 */
+			{
 			/* Fixed-length header:
 			 *		struct {
 			 * (1 byte)	  Version sct_version;
@@ -173,56 +234,96 @@ static int i2r_scts(X509V3_EXT_METHOD *method, ASN1_OCTET_STRING *oct,
 			 * (2 bytes + ?)  CtExtensions extensions;
 			 */
 			if (sctlen < 43)
-				return 0;
+				goto err;
 			sctlen -= 43;
 
-			BIO_printf(out, "\n%*sLog ID    : ", indent + 4, "");
-			BIO_hex_string(out, indent + 16, 16, data + 1, 32);
+			sct->logid = p2;
+			sct->logidlen = 32;
+			p2 += 32;
 
-			data += 33;
-			n2l8(data, timestamp);
-			BIO_printf(out, "\n%*sTimestamp : ", indent + 4, "");
-			timestamp_print(out, timestamp);
+			n2l8(p2, sct->timestamp);
 
-			n2s(data, fieldlen);
+			n2s(p2, fieldlen);
 			if (sctlen < fieldlen)
-				return 0;
+				goto err;
+			sct->ext = p2;
+			sct->extlen = fieldlen;
+			p2 += fieldlen;
 			sctlen -= fieldlen;
-			BIO_printf(out, "\n%*sExtensions: ", indent + 4, "");
-			if (fieldlen == 0)
-				BIO_printf(out, "none");
-			else
-				BIO_hex_string(out, indent + 16, 16, data,
-					       fieldlen);
-			data += fieldlen;
 
 			/* digitally-signed struct header:
-			 * (1 byte) Hash algorithm
-			 * (1 byte) Signature algorithm
-			 * (2 bytes + ?) Signature
+			 * (1 byte)       Hash algorithm
+			 * (1 byte)       Signature algorithm
+			 * (2 bytes + ?)  Signature
 			 */
 			if (sctlen < 4)
-				return 0;
+				goto err;
 			sctlen -= 4;
 
-			BIO_printf(out, "\n%*sSignature : ", indent + 4, "");
-			tls12_signature_print(out, data);
-			data += 2;
-			n2s(data, fieldlen);
+			sct->hash_alg = *p2++;
+			sct->sig_alg = *p2++;
+			n2s(p2, fieldlen);
 			if (sctlen != fieldlen)
-				return 0;
+				goto err;
+			sct->sig = p2;
+			sct->siglen = fieldlen;
+			}
+		}
+
+	done:
+	ASN1_OCTET_STRING_free(oct);
+	return sk;
+
+	err:
+	SCT_LIST_free(sk);
+	sk = NULL;
+	goto done;
+	}
+
+static int i2r_SCT_LIST(X509V3_EXT_METHOD *method, STACK_OF(SCT) *sct_list,
+			BIO *out, int indent)
+	{
+	SCT *sct;
+	int i;
+
+	for (i = 0; i < sk_SCT_num(sct_list);) {
+		sct = sk_SCT_value(sct_list, i);
+
+		BIO_printf(out, "%*sSigned Certificate Timestamp:", indent, "");
+		BIO_printf(out, "\n%*sVersion   : ", indent + 4, "");
+
+		if (sct->version == 0)	/* SCT v1 */
+			{
+			BIO_printf(out, "v1(0)");
+
+			BIO_printf(out, "\n%*sLog ID    : ", indent + 4, "");
+			BIO_hex_string(out, indent + 16, 16, sct->logid,
+				       sct->logidlen);
+
+			BIO_printf(out, "\n%*sTimestamp : ", indent + 4, "");
+			timestamp_print(out, sct->timestamp);
+
+			BIO_printf(out, "\n%*sExtensions: ", indent + 4, "");
+			if (sct->extlen == 0)
+				BIO_printf(out, "none");
+			else
+				BIO_hex_string(out, indent + 16, 16, sct->ext,
+					       sct->extlen);
+
+			BIO_printf(out, "\n%*sSignature : ", indent + 4, "");
+			tls12_signature_print(out, sct->hash_alg, sct->sig_alg);
 			BIO_printf(out, "\n%*s            ", indent + 4, "");
-			BIO_hex_string(out, indent + 16, 16, data, fieldlen);
-			data += fieldlen;
+			BIO_hex_string(out, indent + 16, 16, sct->sig,
+				       sct->siglen);
 			}
 		else			/* Unknown version */
 			{
 			BIO_printf(out, "unknown\n%*s", indent + 16, "");
-			BIO_hex_string(out, indent + 16, 16, data, sctlen);
-			data += sctlen;
+			BIO_hex_string(out, indent + 16, 16, sct->sct,
+				       sct->sctlen);
 			}
 
-		if (listlen > 0) BIO_printf(out, "\n");
+		if (++i < sk_SCT_num(sct_list)) BIO_printf(out, "\n");
 		}
 
 	return 1;