Don't try to guess at overflowing time values on 32-bit systems

Since CKA_START_DATE and CKA_END_DATE are the only places
where we want to parse out times, and these are optional, just
leave blank if the time overflows what libc can handle on
a 32-bit system.

https://bugs.freedesktop.org/show_bug.cgi?id=62825

5 files changed, 80 insertions, 5 deletions

diff --git a/build/certs/Makefile.am b/build/certs/Makefile.am
index 0a46b56..4231591 100644
--- a/build/certs/Makefile.am
+++ b/build/certs/Makefile.am
@@ -45,3 +45,6 @@ build-self-signed:
 	openssl req -new -x509 -outform DER -out self-signed-with-ku.der \
 		-newkey rsa -keyout /dev/null -nodes -subj /CN=self-signed-with-ku.example.com \
 		-config with-ku.conf -set_serial 888 -extensions v3_ca
+	openssl req -new -x509 -outform DER -out distant-end-date.der \
+		-newkey rsa:512 -keyout /dev/null -nodes -subj /CN=far-in-the-future.example.com \
+		-config with-ku.conf -set_serial 999 -extensions v3_ca -days 20000
diff --git a/build/certs/distant-end-date.der b/build/certs/distant-end-date.der
new file mode 100644
index 0000000..1b3fd47
--- /dev/null
+++ b/build/certs/distant-end-date.der
diff --git a/common/asn1.c b/common/asn1.c
index 44f96eb..c98d959 100644
--- a/common/asn1.c
+++ b/common/asn1.c
@@ -469,9 +469,9 @@ when_and_offset_to_time_t (struct tm *when,
 {
 	time_t timet;
 
-	/* In order to work with 32 bit time_t. */
-	if (sizeof (time_t) <= 4 && when->tm_year >= 2038) {
-		timet = (time_t)2145914603;  /* 2037-12-31 23:23:23 */
+	/* A 32-bit time, cannot represent this time */
+	if (sizeof (time_t) <= 4 && when->tm_year >= 138) {
+		return -1;
 
 	/* Convert to seconds since epoch */
 	} else {
diff --git a/trust/builder.c b/trust/builder.c
index 53201ed..b23d018 100644
--- a/trust/builder.c
+++ b/trust/builder.c
@@ -257,14 +257,12 @@ calc_date (node_asn *node,
 		ret = asn1_read_value (node, sub, buf, &len);
 		return_val_if_fail (ret == ASN1_SUCCESS, false);
 		timet = p11_asn1_parse_general (buf, &when);
-		return_val_if_fail (timet >= 0, false);
 
 	} else if (strcmp (buf, "utcTime") == 0) {
 		len = sizeof (buf) - 1;
 		ret = asn1_read_value (node, sub, buf, &len);
 		return_val_if_fail (ret == ASN1_SUCCESS, false);
 		timet = p11_asn1_parse_utc (buf, &when);
-		return_val_if_fail (timet >= 0, false);
 
 	} else {
 		return_val_if_reached (false);
@@ -272,6 +270,9 @@ calc_date (node_asn *node,
 
 	free (sub);
 
+	if (timet < 0)
+		return false;
+
 	assert (sizeof (date->year) == 4);
 	snprintf ((char *)buf, 5, "%04d", 1900 + when.tm_year);
 	memcpy (date->year, buf, 4);
diff --git a/trust/tests/test-builder.c b/trust/tests/test-builder.c
index 3212bac..723a251 100644
--- a/trust/tests/test-builder.c
+++ b/trust/tests/test-builder.c
@@ -514,6 +514,76 @@ test_build_extension (CuTest *cu)
 	teardown (cu);
 }
 
+/* This certificate has and end date in 2067 */
+static const unsigned char cert_distant_end_date[] = {
+	0x30, 0x82, 0x01, 0x6a, 0x30, 0x82, 0x01, 0x14, 0xa0, 0x03, 0x02, 0x01, 0x02, 0x02, 0x02, 0x03,
+	0xe7, 0x30, 0x0d, 0x06, 0x09, 0x2a, 0x86, 0x48, 0x86, 0xf7, 0x0d, 0x01, 0x01, 0x05, 0x05, 0x00,
+	0x30, 0x28, 0x31, 0x26, 0x30, 0x24, 0x06, 0x03, 0x55, 0x04, 0x03, 0x13, 0x1d, 0x66, 0x61, 0x72,
+	0x2d, 0x69, 0x6e, 0x2d, 0x74, 0x68, 0x65, 0x2d, 0x66, 0x75, 0x74, 0x75, 0x72, 0x65, 0x2e, 0x65,
+	0x78, 0x61, 0x6d, 0x70, 0x6c, 0x65, 0x2e, 0x63, 0x6f, 0x6d, 0x30, 0x20, 0x17, 0x0d, 0x31, 0x33,
+	0x30, 0x33, 0x32, 0x37, 0x31, 0x36, 0x34, 0x39, 0x33, 0x33, 0x5a, 0x18, 0x0f, 0x32, 0x30, 0x36,
+	0x37, 0x31, 0x32, 0x32, 0x39, 0x31, 0x36, 0x34, 0x39, 0x33, 0x33, 0x5a, 0x30, 0x28, 0x31, 0x26,
+	0x30, 0x24, 0x06, 0x03, 0x55, 0x04, 0x03, 0x13, 0x1d, 0x66, 0x61, 0x72, 0x2d, 0x69, 0x6e, 0x2d,
+	0x74, 0x68, 0x65, 0x2d, 0x66, 0x75, 0x74, 0x75, 0x72, 0x65, 0x2e, 0x65, 0x78, 0x61, 0x6d, 0x70,
+	0x6c, 0x65, 0x2e, 0x63, 0x6f, 0x6d, 0x30, 0x5c, 0x30, 0x0d, 0x06, 0x09, 0x2a, 0x86, 0x48, 0x86,
+	0xf7, 0x0d, 0x01, 0x01, 0x01, 0x05, 0x00, 0x03, 0x4b, 0x00, 0x30, 0x48, 0x02, 0x41, 0x00, 0xe2,
+	0x2d, 0x35, 0x70, 0x75, 0xc0, 0x07, 0x56, 0x40, 0x7d, 0x63, 0xbc, 0xd2, 0x60, 0xb3, 0xcf, 0xb8,
+	0x3d, 0x27, 0x6e, 0x10, 0xcd, 0x42, 0x50, 0x51, 0x9d, 0x79, 0x30, 0x79, 0x5a, 0xe3, 0xc3, 0x51,
+	0x38, 0x85, 0x4c, 0xb4, 0x91, 0xd9, 0xe6, 0x8d, 0x69, 0x6a, 0xd4, 0x9c, 0x1c, 0x49, 0xc2, 0x25,
+	0x2a, 0xc9, 0x2b, 0xf2, 0xf4, 0x8e, 0x8a, 0x3f, 0x8b, 0x4c, 0x97, 0xc3, 0x16, 0x96, 0x99, 0x02,
+	0x03, 0x01, 0x00, 0x01, 0xa3, 0x26, 0x30, 0x24, 0x30, 0x22, 0x06, 0x03, 0x55, 0x1d, 0x25, 0x04,
+	0x1b, 0x30, 0x19, 0x06, 0x08, 0x2b, 0x06, 0x01, 0x05, 0x05, 0x07, 0x03, 0x02, 0x06, 0x08, 0x2b,
+	0x06, 0x01, 0x05, 0x05, 0x07, 0x03, 0x04, 0x06, 0x03, 0x2a, 0x03, 0x04, 0x30, 0x0d, 0x06, 0x09,
+	0x2a, 0x86, 0x48, 0x86, 0xf7, 0x0d, 0x01, 0x01, 0x05, 0x05, 0x00, 0x03, 0x41, 0x00, 0xc2, 0x83,
+	0x27, 0x32, 0x80, 0x74, 0x73, 0xe2, 0xa3, 0x92, 0xaa, 0x7c, 0xd8, 0x50, 0xf4, 0x61, 0x50, 0xb1,
+	0x63, 0x9e, 0x29, 0xef, 0x38, 0x1d, 0xc0, 0x55, 0x20, 0x0f, 0x7e, 0xe9, 0x1f, 0xa1, 0x54, 0x1a,
+	0x5f, 0x8c, 0x26, 0x1b, 0x66, 0x96, 0x0e, 0x64, 0x52, 0x1c, 0x00, 0x96, 0xfb, 0x81, 0x77, 0xa2,
+	0x3a, 0x1d, 0x49, 0x0c, 0x03, 0xd5, 0x19, 0xf2, 0x6a, 0x01, 0x29, 0x31, 0xfb, 0xf5,
+};
+
+static void
+test_build_distant_end_date (CuTest *cu)
+{
+	CK_ATTRIBUTE input[] = {
+		{ CKA_CLASS, &certificate, sizeof (certificate) },
+		{ CKA_CERTIFICATE_TYPE, &x509, sizeof (x509) },
+		{ CKA_VALUE, (void *)cert_distant_end_date, sizeof (cert_distant_end_date) },
+		{ CKA_INVALID },
+	};
+
+	CK_ATTRIBUTE expected[] = {
+		{ CKA_END_DATE, },
+		{ CKA_START_DATE, "20130327", 8 },
+		{ CKA_INVALID },
+	};
+
+	CK_ATTRIBUTE *attrs;
+	CK_RV rv;
+
+	setup (cu);
+
+	/*
+	 * On a 32-bit system, the end date will be too big to compute with
+	 * libc. So it'll be empty, since this is an optional field.
+	 */
+	if (sizeof (time_t) <= 4) {
+		expected[0].pValue = "";
+		expected[0].ulValueLen = 0;
+	} else {
+		expected[0].pValue = "20671229";
+		expected[0].ulValueLen = 8;
+	}
+
+	attrs = NULL;
+	rv = p11_builder_build (test.builder, test.index, &attrs, p11_attrs_dup (input));
+	CuAssertIntEquals (cu, CKR_OK, rv);
+
+	test_check_attrs (cu, expected, attrs);
+	p11_attrs_free (attrs);
+
+	teardown (cu);
+}
+
 static void
 test_create_not_settable (CuTest *cu)
 {
@@ -1666,6 +1736,7 @@ main (void)
 	SUITE_ADD_TEST (suite, test_build_certificate_no_type);
 	SUITE_ADD_TEST (suite, test_build_certificate_bad_type);
 	SUITE_ADD_TEST (suite, test_build_extension);
+	SUITE_ADD_TEST (suite, test_build_distant_end_date);
 	SUITE_ADD_TEST (suite, test_create_not_settable);
 	SUITE_ADD_TEST (suite, test_create_but_loadable);
 	SUITE_ADD_TEST (suite, test_create_unsupported);