Properly ASN.1 encode dates in certificates depending on the year.

src/libstrongswan/asn1/asn1.c

@@ -426,8 +426,9 @@ time_t asn1_to_time(const chunk_t *utctime, asn1_t type)
 /**
  *  Convert a date into ASN.1 UTCTIME or GENERALIZEDTIME format
  */
-chunk_t asn1_from_time(const time_t *time, asn1_t type)
+chunk_t asn1_from_time(const time_t *time)
 {
+	asn1_t type;
 	int offset;
 	const char *format;
 	char buf[BUF_LEN];
@@ -435,6 +436,9 @@ chunk_t asn1_from_time(const time_t *time, asn1_t type)
 	struct tm t;
 
 	gmtime_r(time, &t);
+	/* RFC 5280 says that dates through the year 2049 MUST be encoded as UTCTIME
+	 * and dates in 2050 or later MUST be encoded as GENERALIZEDTIME */
+	type = (t.tm_year < 150) ? ASN1_UTCTIME : ASN1_GENERALIZEDTIME;
 	if (type == ASN1_GENERALIZEDTIME)
 	{
 		format = "%04d%02d%02d%02d%02d%02dZ";
@@ -443,7 +447,7 @@ chunk_t asn1_from_time(const time_t *time, asn1_t type)
 	else /* ASN1_UTCTIME */
 	{
 		format = "%02d%02d%02d%02d%02d%02dZ";
-		offset = (t.tm_year < 100)? 0 : -100;
+		offset = (t.tm_year < 100) ? 0 : -100;
 	}
 	snprintf(buf, BUF_LEN, format, t.tm_year + offset,
 			 t.tm_mon + 1, t.tm_mday, t.tm_hour, t.tm_min, t.tm_sec);

src/libstrongswan/asn1/asn1.h

@@ -35,8 +35,8 @@ typedef enum {
 	ASN1_BOOLEAN =			0x01,
 	ASN1_INTEGER =			0x02,
 	ASN1_BIT_STRING =		0x03,
-	ASN1_OCTET_STRING = 	0x04,
-	ASN1_NULL = 			0x05,
+	ASN1_OCTET_STRING =		0x04,
+	ASN1_NULL =				0x05,
 	ASN1_OID =				0x06,
 	ASN1_ENUMERATED =		0x0A,
 	ASN1_UTF8STRING =		0x0C,
@@ -48,7 +48,7 @@ typedef enum {
 	ASN1_UTCTIME =			0x17,
 	ASN1_GENERALIZEDTIME =	0x18,
 	ASN1_GRAPHICSTRING =	0x19,
-	ASN1_VISIBLESTRING = 	0x1A,
+	ASN1_VISIBLESTRING =	0x1A,
 	ASN1_GENERALSTRING =	0x1B,
 	ASN1_UNIVERSALSTRING =	0x1C,
 	ASN1_BMPSTRING =		0x1E,
@@ -75,7 +75,7 @@ typedef enum {
 	ASN1_CONTEXT_C_4 =		0xA4,
 	ASN1_CONTEXT_C_5 =		0xA5,
 
-	ASN1_INVALID = 			0x100,
+	ASN1_INVALID =			0x100,
 } asn1_t;
 
 #define ASN1_INVALID_LENGTH	0xffffffff
@@ -191,11 +191,12 @@ time_t asn1_to_time(const chunk_t *utctime, asn1_t type);
 /**
  * Converts time_t to an ASN.1 UTCTIME or GENERALIZEDTIME string
  *
+ * The type is automatically chosen based on the encoded year.
+ *
  * @param time		time_t in UTC
- * @param type		ASN1_UTCTIME or ASN1_GENERALIZEDTIME
  * @return			body of an ASN.1 code time object
  */
-chunk_t asn1_from_time(const time_t *time, asn1_t type);
+chunk_t asn1_from_time(const time_t *time);
 
 /**
  * Parse an ASN.1 UTCTIME or GENERALIZEDTIME object

src/libstrongswan/crypto/pkcs7.c

@@ -825,7 +825,7 @@ METHOD(pkcs7_t, build_signedData, bool,
 
 			/* take the current time as signingTime */
 			time_t now = time(NULL);
-			chunk_t	signingTime = asn1_from_time(&now, ASN1_UTCTIME);
+			chunk_t signingTime = asn1_from_time(&now);
 
 			chunk_t messageDigest, attributes;
 

src/libstrongswan/plugins/x509/x509_ac.c

@@ -527,8 +527,8 @@ static chunk_t build_v2_form(private_x509_ac_t *this)
 static chunk_t build_attr_cert_validity(private_x509_ac_t *this)
 {
 	return asn1_wrap(ASN1_SEQUENCE, "mm",
-				asn1_from_time(&this->notBefore, ASN1_GENERALIZEDTIME),
-				asn1_from_time(&this->notAfter,  ASN1_GENERALIZEDTIME));
+				asn1_from_time(&this->notBefore),
+				asn1_from_time(&this->notAfter));
 }
 
 

src/libstrongswan/plugins/x509/x509_cert.c

@@ -2316,8 +2316,8 @@ static bool generate(private_x509_cert_t *cert, certificate_t *sign_cert,
 		asn1_algorithmIdentifier(cert->algorithm),
 		issuer->get_encoding(issuer),
 		asn1_wrap(ASN1_SEQUENCE, "mm",
-			asn1_from_time(&cert->notBefore, ASN1_UTCTIME),
-			asn1_from_time(&cert->notAfter, ASN1_UTCTIME)),
+			asn1_from_time(&cert->notBefore),
+			asn1_from_time(&cert->notAfter)),
 		subject->get_encoding(subject),
 		key_info, extensions);
 

src/libstrongswan/plugins/x509/x509_crl.c

@@ -736,7 +736,7 @@ static bool generate(private_x509_crl_t *this, certificate_t *cert,
 		}
 		revoked = asn1_wrap(ASN1_SEQUENCE, "mmm",
 							asn1_integer("c", serial),
-							asn1_from_time(&date, ASN1_UTCTIME),
+							asn1_from_time(&date),
 							entry_ext);
 		certList = chunk_cat("mm", certList, revoked);
 	}
@@ -773,8 +773,8 @@ static bool generate(private_x509_crl_t *this, certificate_t *cert,
 							ASN1_INTEGER_1,
 							asn1_algorithmIdentifier(this->algorithm),
 							this->issuer->get_encoding(this->issuer),
-							asn1_from_time(&this->thisUpdate, ASN1_UTCTIME),
-							asn1_from_time(&this->nextUpdate, ASN1_UTCTIME),
+							asn1_from_time(&this->thisUpdate),
+							asn1_from_time(&this->nextUpdate),
 							asn1_wrap(ASN1_SEQUENCE, "m", certList),
 							extensions);