| // Copyright 2015 The Chromium Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| #include "net/der/parser.h" |
| |
| #include "net/der/input.h" |
| #include "net/der/parse_values.h" |
| #include "testing/gtest/include/gtest/gtest.h" |
| |
| namespace net { |
| namespace der { |
| namespace test { |
| |
| TEST(ParserTest, ConsumesAllBytesOfTLV) { |
| const uint8_t der[] = {0x04, 0x00}; |
| Parser parser((Input(der))); |
| Tag tag; |
| Input value; |
| ASSERT_TRUE(parser.ReadTagAndValue(&tag, &value)); |
| ASSERT_EQ(0x04, tag); |
| ASSERT_FALSE(parser.HasMore()); |
| } |
| |
| TEST(ParserTest, CanReadRawTLV) { |
| const uint8_t der[] = {0x02, 0x01, 0x01}; |
| Parser parser((Input(der))); |
| Input tlv; |
| ASSERT_TRUE(parser.ReadRawTLV(&tlv)); |
| ByteReader tlv_reader(tlv); |
| size_t tlv_len = tlv_reader.BytesLeft(); |
| ASSERT_EQ(3u, tlv_len); |
| Input tlv_data; |
| ASSERT_TRUE(tlv_reader.ReadBytes(tlv_len, &tlv_data)); |
| ASSERT_FALSE(parser.HasMore()); |
| } |
| |
| TEST(ParserTest, IgnoresContentsOfInnerValues) { |
| // This is a SEQUENCE which has one member. The member is another SEQUENCE |
| // with an invalid encoding - its length is too long. |
| const uint8_t der[] = {0x30, 0x02, 0x30, 0x7e}; |
| Parser parser((Input(der))); |
| Tag tag; |
| Input value; |
| ASSERT_TRUE(parser.ReadTagAndValue(&tag, &value)); |
| } |
| |
| TEST(ParserTest, FailsIfLengthOverlapsAnotherTLV) { |
| // This DER encoding has 2 top-level TLV tuples. The first is a SEQUENCE; |
| // the second is an INTEGER. The SEQUENCE contains an INTEGER, but its length |
| // is longer than what it has contents for. |
| const uint8_t der[] = {0x30, 0x02, 0x02, 0x01, 0x02, 0x01, 0x01}; |
| Parser parser((Input(der))); |
| |
| Parser inner_sequence; |
| ASSERT_TRUE(parser.ReadSequence(&inner_sequence)); |
| uint64_t int_value; |
| ASSERT_TRUE(parser.ReadUint64(&int_value)); |
| ASSERT_EQ(1u, int_value); |
| ASSERT_FALSE(parser.HasMore()); |
| |
| // Try to read the INTEGER from the SEQUENCE, which should fail. |
| Tag tag; |
| Input value; |
| ASSERT_FALSE(inner_sequence.ReadTagAndValue(&tag, &value)); |
| } |
| |
| TEST(ParserTest, CanSkipOptionalTagAtEndOfInput) { |
| const uint8_t der[] = {0x02, 0x01, 0x01}; |
| Parser parser((Input(der))); |
| |
| Tag tag; |
| Input value; |
| ASSERT_TRUE(parser.ReadTagAndValue(&tag, &value)); |
| bool present; |
| ASSERT_TRUE(parser.ReadOptionalTag(0x02, &value, &present)); |
| ASSERT_FALSE(present); |
| ASSERT_FALSE(parser.HasMore()); |
| } |
| |
| TEST(ParserTest, SkipOptionalTagDoesntConsumePresentNonMatchingTLVs) { |
| const uint8_t der[] = {0x02, 0x01, 0x01}; |
| Parser parser((Input(der))); |
| |
| bool present; |
| ASSERT_TRUE(parser.SkipOptionalTag(0x04, &present)); |
| ASSERT_FALSE(present); |
| ASSERT_TRUE(parser.SkipOptionalTag(0x02, &present)); |
| ASSERT_TRUE(present); |
| ASSERT_FALSE(parser.HasMore()); |
| } |
| |
| TEST(ParserTest, TagNumbersAboveThirtyUnsupported) { |
| // Context-specific class, tag number 31, length 0. |
| const uint8_t der[] = {0x9f, 0x1f, 0x00}; |
| Parser parser((Input(der))); |
| |
| Tag tag; |
| Input value; |
| ASSERT_FALSE(parser.ReadTagAndValue(&tag, &value)); |
| ASSERT_TRUE(parser.HasMore()); |
| } |
| |
| TEST(ParserTest, IncompleteEncodingTagOnly) { |
| const uint8_t der[] = {0x01}; |
| Parser parser((Input(der))); |
| |
| Tag tag; |
| Input value; |
| ASSERT_FALSE(parser.ReadTagAndValue(&tag, &value)); |
| ASSERT_TRUE(parser.HasMore()); |
| } |
| |
| TEST(ParserTest, IncompleteEncodingLengthTruncated) { |
| // Tag: octet string; length: long form, should have 2 total octets, but |
| // the last one is missing. (There's also no value.) |
| const uint8_t der[] = {0x04, 0x81}; |
| Parser parser((Input(der))); |
| |
| Tag tag; |
| Input value; |
| ASSERT_FALSE(parser.ReadTagAndValue(&tag, &value)); |
| ASSERT_TRUE(parser.HasMore()); |
| } |
| |
| TEST(ParserTest, IncompleteEncodingValueShorterThanLength) { |
| // Tag: octet string; length: 2; value: first octet 'T', second octet missing. |
| const uint8_t der[] = {0x04, 0x02, 0x84}; |
| Parser parser((Input(der))); |
| |
| Tag tag; |
| Input value; |
| ASSERT_FALSE(parser.ReadTagAndValue(&tag, &value)); |
| ASSERT_TRUE(parser.HasMore()); |
| } |
| |
| TEST(ParserTest, LengthMustBeEncodedWithMinimumNumberOfOctets) { |
| const uint8_t der[] = {0x01, 0x81, 0x01, 0x00}; |
| Parser parser((Input(der))); |
| |
| Tag tag; |
| Input value; |
| ASSERT_FALSE(parser.ReadTagAndValue(&tag, &value)); |
| ASSERT_TRUE(parser.HasMore()); |
| } |
| |
| TEST(ParserTest, LengthMustNotHaveLeadingZeroes) { |
| // Tag: octet string; length: 3 bytes of length encoding a value of 128 |
| // (it should be encoded in only 2 bytes). Value: 128 bytes of 0. |
| const uint8_t der[] = { |
| 0x04, 0x83, 0x80, 0x81, 0x80, // group the 0s separately |
| 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, |
| 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, |
| 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, |
| 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, |
| 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, |
| 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, |
| 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, |
| 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, |
| 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, |
| 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, |
| 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00}; |
| Parser parser((Input(der))); |
| |
| Tag tag; |
| Input value; |
| ASSERT_FALSE(parser.ReadTagAndValue(&tag, &value)); |
| ASSERT_TRUE(parser.HasMore()); |
| } |
| |
| TEST(ParserTest, ReadConstructedFailsForNonConstructedTags) { |
| // Tag number is for SEQUENCE, but the constructed bit isn't set. |
| const uint8_t der[] = {0x10, 0x00}; |
| Parser parser((Input(der))); |
| |
| Tag expected_tag = 0x10; |
| Parser sequence_parser; |
| ASSERT_FALSE(parser.ReadConstructed(expected_tag, &sequence_parser)); |
| |
| // Check that we didn't fail above because of a tag mismatch or an improperly |
| // encoded TLV. |
| Input value; |
| ASSERT_TRUE(parser.ReadTag(expected_tag, &value)); |
| ASSERT_FALSE(parser.HasMore()); |
| } |
| |
| TEST(ParserTest, CannotAdvanceAfterReadOptionalTag) { |
| const uint8_t der[] = {0x02, 0x01, 0x01}; |
| Parser parser((Input(der))); |
| |
| Input value; |
| bool present; |
| ASSERT_TRUE(parser.ReadOptionalTag(0x04, &value, &present)); |
| ASSERT_FALSE(present); |
| ASSERT_FALSE(parser.Advance()); |
| } |
| |
| // Reads a valid BIT STRING with 1 unused bit. |
| TEST(ParserTest, ReadBitString) { |
| const uint8_t der[] = {0x03, 0x03, 0x01, 0xAA, 0xBE}; |
| Parser parser((Input(der))); |
| |
| BitString bit_string; |
| ASSERT_TRUE(parser.ReadBitString(&bit_string)); |
| EXPECT_FALSE(parser.HasMore()); |
| |
| EXPECT_EQ(1u, bit_string.unused_bits()); |
| ASSERT_EQ(2u, bit_string.bytes().Length()); |
| EXPECT_EQ(0xAA, bit_string.bytes().UnsafeData()[0]); |
| EXPECT_EQ(0xBE, bit_string.bytes().UnsafeData()[1]); |
| } |
| |
| // Tries reading a BIT STRING. This should fail because the tag is not for a |
| // BIT STRING. |
| TEST(ParserTest, ReadBitStringBadTag) { |
| const uint8_t der[] = {0x05, 0x03, 0x01, 0xAA, 0xBE}; |
| Parser parser((Input(der))); |
| |
| BitString bit_string; |
| EXPECT_FALSE(parser.ReadBitString(&bit_string)); |
| } |
| |
| } // namespace test |
| } // namespace der |
| } // namespace net |