Allow callers to force ASN.1 date encoding as GENERALIZEDTIME.

src/libstrongswan/asn1/asn1.c

@@ -426,9 +426,8 @@ 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)
+chunk_t asn1_from_time(const time_t *time, asn1_t type)
 {
-	asn1_t type;
 	int offset;
 	const char *format;
 	char buf[BUF_LEN];
@@ -437,8 +436,10 @@ chunk_t asn1_from_time(const time_t *time)
 
 	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;
+	 * and dates in 2050 or later MUST be encoded as GENERALIZEDTIME. We only
+	 * enforce the latter to avoid overflows but allow callers to force the
+	 * encoding to GENERALIZEDTIME */
+	type = (t.tm_year >= 150) ? ASN1_GENERALIZEDTIME : type;
 	if (type == ASN1_GENERALIZEDTIME)
 	{
 		format = "%04d%02d%02d%02d%02d%02dZ";

src/libstrongswan/asn1/asn1.h

@@ -191,12 +191,13 @@ 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.
+ * @note The type is automatically changed to GENERALIZEDTIME if needed
  *
  * @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);
+chunk_t asn1_from_time(const time_t *time, asn1_t type);
 
 /**
  * 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);
+			chunk_t signingTime = asn1_from_time(&now, ASN1_UTCTIME);
 
 			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_from_time(&this->notAfter));
+				asn1_from_time(&this->notBefore, ASN1_GENERALIZEDTIME),
+				asn1_from_time(&this->notAfter, ASN1_GENERALIZEDTIME));
 }
 
 

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_from_time(&cert->notAfter)),
+			asn1_from_time(&cert->notBefore, ASN1_UTCTIME),
+			asn1_from_time(&cert->notAfter, ASN1_UTCTIME)),
 		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_from_time(&date, ASN1_UTCTIME),
 							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_from_time(&this->nextUpdate),
+							asn1_from_time(&this->thisUpdate, ASN1_UTCTIME),
+							asn1_from_time(&this->nextUpdate, ASN1_UTCTIME),
 							asn1_wrap(ASN1_SEQUENCE, "m", certList),
 							extensions);