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authorTianjie Xu <xunchang@google.com>2018-10-25 19:25:49 +0200
committerGerrit Code Review <noreply-gerritcodereview@google.com>2018-10-25 19:25:49 +0200
commit64ceace44f7a76d6b459edf4bfe42818b6825b4b (patch)
treecbdeff595a2fa616db60afe4ebff00ff0c0e50a6
parentMerge "Add sanity check when loading public keys for OTA package" (diff)
parentRemove the load_keys function (diff)
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-rw-r--r--tests/component/verifier_test.cpp84
-rw-r--r--verifier.cpp249
-rw-r--r--verifier.h2
3 files changed, 9 insertions, 326 deletions
diff --git a/tests/component/verifier_test.cpp b/tests/component/verifier_test.cpp
index 14b6060c3..480f3c96c 100644
--- a/tests/component/verifier_test.cpp
+++ b/tests/component/verifier_test.cpp
@@ -238,8 +238,9 @@ class VerifierTest : public testing::TestWithParam<std::vector<std::string>> {
}
for (auto it = ++args.cbegin(); it != args.cend(); ++it) {
- std::string public_key_file = from_testdata_base("testkey_" + *it + ".txt");
- ASSERT_TRUE(load_keys(public_key_file.c_str(), certs));
+ std::string public_key_file = from_testdata_base("testkey_" + *it + ".x509.pem");
+ certs.emplace_back(0, Certificate::KEY_TYPE_RSA, nullptr, nullptr);
+ LoadKeyFromFile(public_key_file, &certs.back());
}
}
@@ -253,70 +254,10 @@ class VerifierSuccessTest : public VerifierTest {
class VerifierFailureTest : public VerifierTest {
};
-TEST(VerifierTest, load_keys_multiple_keys) {
- std::string testkey_v4;
- ASSERT_TRUE(android::base::ReadFileToString(from_testdata_base("testkey_v4.txt"), &testkey_v4));
-
- std::string testkey_v3;
- ASSERT_TRUE(android::base::ReadFileToString(from_testdata_base("testkey_v3.txt"), &testkey_v3));
-
- std::string keys = testkey_v4 + "," + testkey_v3 + "," + testkey_v4;
- TemporaryFile key_file1;
- ASSERT_TRUE(android::base::WriteStringToFile(keys, key_file1.path));
- std::vector<Certificate> certs;
- ASSERT_TRUE(load_keys(key_file1.path, certs));
- ASSERT_EQ(3U, certs.size());
-}
-
-TEST(VerifierTest, load_keys_invalid_keys) {
- std::vector<Certificate> certs;
- ASSERT_FALSE(load_keys("/doesntexist", certs));
-
- // Empty file.
- TemporaryFile key_file1;
- ASSERT_FALSE(load_keys(key_file1.path, certs));
-
- // Invalid contents.
- ASSERT_TRUE(android::base::WriteStringToFile("invalid", key_file1.path));
- ASSERT_FALSE(load_keys(key_file1.path, certs));
-
- std::string testkey_v4;
- ASSERT_TRUE(android::base::ReadFileToString(from_testdata_base("testkey_v4.txt"), &testkey_v4));
-
- // Invalid key version: "v4 ..." => "v6 ...".
- std::string invalid_key2(testkey_v4);
- invalid_key2[1] = '6';
- TemporaryFile key_file2;
- ASSERT_TRUE(android::base::WriteStringToFile(invalid_key2, key_file2.path));
- ASSERT_FALSE(load_keys(key_file2.path, certs));
-
- // Invalid key content: inserted extra bytes ",2209831334".
- std::string invalid_key3(testkey_v4);
- invalid_key3.insert(invalid_key2.size() - 2, ",2209831334");
- TemporaryFile key_file3;
- ASSERT_TRUE(android::base::WriteStringToFile(invalid_key3, key_file3.path));
- ASSERT_FALSE(load_keys(key_file3.path, certs));
-
- // Invalid key: the last key must not end with an extra ','.
- std::string invalid_key4 = testkey_v4 + ",";
- TemporaryFile key_file4;
- ASSERT_TRUE(android::base::WriteStringToFile(invalid_key4, key_file4.path));
- ASSERT_FALSE(load_keys(key_file4.path, certs));
-
- // Invalid key separator.
- std::string invalid_key5 = testkey_v4 + ";" + testkey_v4;
- TemporaryFile key_file5;
- ASSERT_TRUE(android::base::WriteStringToFile(invalid_key5, key_file5.path));
- ASSERT_FALSE(load_keys(key_file5.path, certs));
-}
-
TEST(VerifierTest, BadPackage_AlteredFooter) {
- std::string testkey_v3;
- ASSERT_TRUE(android::base::ReadFileToString(from_testdata_base("testkey_v3.txt"), &testkey_v3));
- TemporaryFile key_file1;
- ASSERT_TRUE(android::base::WriteStringToFile(testkey_v3, key_file1.path));
std::vector<Certificate> certs;
- ASSERT_TRUE(load_keys(key_file1.path, certs));
+ certs.emplace_back(0, Certificate::KEY_TYPE_RSA, nullptr, nullptr);
+ LoadKeyFromFile(from_testdata_base("testkey_v3.x509.pem"), &certs.back());
std::string package;
ASSERT_TRUE(android::base::ReadFileToString(from_testdata_base("otasigned_v3.zip"), &package));
@@ -330,12 +271,9 @@ TEST(VerifierTest, BadPackage_AlteredFooter) {
}
TEST(VerifierTest, BadPackage_AlteredContent) {
- std::string testkey_v3;
- ASSERT_TRUE(android::base::ReadFileToString(from_testdata_base("testkey_v3.txt"), &testkey_v3));
- TemporaryFile key_file1;
- ASSERT_TRUE(android::base::WriteStringToFile(testkey_v3, key_file1.path));
std::vector<Certificate> certs;
- ASSERT_TRUE(load_keys(key_file1.path, certs));
+ certs.emplace_back(0, Certificate::KEY_TYPE_RSA, nullptr, nullptr);
+ LoadKeyFromFile(from_testdata_base("testkey_v3.x509.pem"), &certs.back());
std::string package;
ASSERT_TRUE(android::base::ReadFileToString(from_testdata_base("otasigned_v3.zip"), &package));
@@ -356,13 +294,9 @@ TEST(VerifierTest, BadPackage_AlteredContent) {
}
TEST(VerifierTest, BadPackage_SignatureStartOutOfBounds) {
- std::string testkey_v3;
- ASSERT_TRUE(android::base::ReadFileToString(from_testdata_base("testkey_v3.txt"), &testkey_v3));
-
- TemporaryFile key_file;
- ASSERT_TRUE(android::base::WriteStringToFile(testkey_v3, key_file.path));
std::vector<Certificate> certs;
- ASSERT_TRUE(load_keys(key_file.path, certs));
+ certs.emplace_back(0, Certificate::KEY_TYPE_RSA, nullptr, nullptr);
+ LoadKeyFromFile(from_testdata_base("testkey_v3.x509.pem"), &certs.back());
// Signature start is 65535 (0xffff) while comment size is 0 (Bug: 31914369).
std::string package = "\x50\x4b\x05\x06"s + std::string(12, '\0') + "\xff\xff\xff\xff\x00\x00"s;
diff --git a/verifier.cpp b/verifier.cpp
index 2dfc20808..44bd4e180 100644
--- a/verifier.cpp
+++ b/verifier.cpp
@@ -308,144 +308,6 @@ int verify_file(const unsigned char* addr, size_t length, const std::vector<Cert
return VERIFY_FAILURE;
}
-std::unique_ptr<RSA, RSADeleter> parse_rsa_key(FILE* file, uint32_t exponent) {
- // Read key length in words and n0inv. n0inv is a precomputed montgomery
- // parameter derived from the modulus and can be used to speed up
- // verification. n0inv is 32 bits wide here, assuming the verification logic
- // uses 32 bit arithmetic. However, BoringSSL may use a word size of 64 bits
- // internally, in which case we don't have a valid n0inv. Thus, we just
- // ignore the montgomery parameters and have BoringSSL recompute them
- // internally. If/When the speedup from using the montgomery parameters
- // becomes relevant, we can add more sophisticated code here to obtain a
- // 64-bit n0inv and initialize the montgomery parameters in the key object.
- uint32_t key_len_words = 0;
- uint32_t n0inv = 0;
- if (fscanf(file, " %i , 0x%x", &key_len_words, &n0inv) != 2) {
- return nullptr;
- }
-
- if (key_len_words > 8192 / 32) {
- LOG(ERROR) << "key length (" << key_len_words << ") too large";
- return nullptr;
- }
-
- // Read the modulus.
- std::unique_ptr<uint32_t[]> modulus(new uint32_t[key_len_words]);
- if (fscanf(file, " , { %u", &modulus[0]) != 1) {
- return nullptr;
- }
- for (uint32_t i = 1; i < key_len_words; ++i) {
- if (fscanf(file, " , %u", &modulus[i]) != 1) {
- return nullptr;
- }
- }
-
- // Cconvert from little-endian array of little-endian words to big-endian
- // byte array suitable as input for BN_bin2bn.
- std::reverse((uint8_t*)modulus.get(),
- (uint8_t*)(modulus.get() + key_len_words));
-
- // The next sequence of values is the montgomery parameter R^2. Since we
- // generally don't have a valid |n0inv|, we ignore this (see comment above).
- uint32_t rr_value;
- if (fscanf(file, " } , { %u", &rr_value) != 1) {
- return nullptr;
- }
- for (uint32_t i = 1; i < key_len_words; ++i) {
- if (fscanf(file, " , %u", &rr_value) != 1) {
- return nullptr;
- }
- }
- if (fscanf(file, " } } ") != 0) {
- return nullptr;
- }
-
- // Initialize the key.
- std::unique_ptr<RSA, RSADeleter> key(RSA_new());
- if (!key) {
- return nullptr;
- }
-
- key->n = BN_bin2bn((uint8_t*)modulus.get(),
- key_len_words * sizeof(uint32_t), NULL);
- if (!key->n) {
- return nullptr;
- }
-
- key->e = BN_new();
- if (!key->e || !BN_set_word(key->e, exponent)) {
- return nullptr;
- }
-
- return key;
-}
-
-struct BNDeleter {
- void operator()(BIGNUM* bn) const {
- BN_free(bn);
- }
-};
-
-std::unique_ptr<EC_KEY, ECKEYDeleter> parse_ec_key(FILE* file) {
- uint32_t key_len_bytes = 0;
- if (fscanf(file, " %i", &key_len_bytes) != 1) {
- return nullptr;
- }
-
- std::unique_ptr<EC_GROUP, void (*)(EC_GROUP*)> group(
- EC_GROUP_new_by_curve_name(NID_X9_62_prime256v1), EC_GROUP_free);
- if (!group) {
- return nullptr;
- }
-
- // Verify that |key_len| matches the group order.
- if (key_len_bytes != BN_num_bytes(EC_GROUP_get0_order(group.get()))) {
- return nullptr;
- }
-
- // Read the public key coordinates. Note that the byte order in the file is
- // little-endian, so we convert to big-endian here.
- std::unique_ptr<uint8_t[]> bytes(new uint8_t[key_len_bytes]);
- std::unique_ptr<BIGNUM, BNDeleter> point[2];
- for (int i = 0; i < 2; ++i) {
- unsigned int byte = 0;
- if (fscanf(file, " , { %u", &byte) != 1) {
- return nullptr;
- }
- bytes[key_len_bytes - 1] = byte;
-
- for (size_t i = 1; i < key_len_bytes; ++i) {
- if (fscanf(file, " , %u", &byte) != 1) {
- return nullptr;
- }
- bytes[key_len_bytes - i - 1] = byte;
- }
-
- point[i].reset(BN_bin2bn(bytes.get(), key_len_bytes, nullptr));
- if (!point[i]) {
- return nullptr;
- }
-
- if (fscanf(file, " }") != 0) {
- return nullptr;
- }
- }
-
- if (fscanf(file, " } ") != 0) {
- return nullptr;
- }
-
- // Create and initialize the key.
- std::unique_ptr<EC_KEY, ECKEYDeleter> key(EC_KEY_new());
- if (!key || !EC_KEY_set_group(key.get(), group.get()) ||
- !EC_KEY_set_public_key_affine_coordinates(key.get(), point[0].get(),
- point[1].get())) {
- return nullptr;
- }
-
- return key;
-}
-
static std::vector<Certificate> IterateZipEntriesAndSearchForKeys(const ZipArchiveHandle& handle) {
void* cookie;
ZipString suffix("x509.pem");
@@ -603,114 +465,3 @@ bool LoadCertificateFromBuffer(const std::vector<uint8_t>& pem_content, Certific
return true;
}
-
-// Reads a file containing one or more public keys as produced by
-// DumpPublicKey: this is an RSAPublicKey struct as it would appear
-// as a C source literal, eg:
-//
-// "{64,0xc926ad21,{1795090719,...,-695002876},{-857949815,...,1175080310}}"
-//
-// For key versions newer than the original 2048-bit e=3 keys
-// supported by Android, the string is preceded by a version
-// identifier, eg:
-//
-// "v2 {64,0xc926ad21,{1795090719,...,-695002876},{-857949815,...,1175080310}}"
-//
-// (Note that the braces and commas in this example are actual
-// characters the parser expects to find in the file; the ellipses
-// indicate more numbers omitted from this example.)
-//
-// The file may contain multiple keys in this format, separated by
-// commas. The last key must not be followed by a comma.
-//
-// A Certificate is a pair of an RSAPublicKey and a particular hash
-// (we support SHA-1 and SHA-256; we store the hash length to signify
-// which is being used). The hash used is implied by the version number.
-//
-// 1: 2048-bit RSA key with e=3 and SHA-1 hash
-// 2: 2048-bit RSA key with e=65537 and SHA-1 hash
-// 3: 2048-bit RSA key with e=3 and SHA-256 hash
-// 4: 2048-bit RSA key with e=65537 and SHA-256 hash
-// 5: 256-bit EC key using the NIST P-256 curve parameters and SHA-256 hash
-//
-// Returns true on success, and appends the found keys (at least one) to certs.
-// Otherwise returns false if the file failed to parse, or if it contains zero
-// keys. The contents in certs would be unspecified on failure.
-bool load_keys(const char* filename, std::vector<Certificate>& certs) {
- std::unique_ptr<FILE, decltype(&fclose)> f(fopen(filename, "re"), fclose);
- if (!f) {
- PLOG(ERROR) << "error opening " << filename;
- return false;
- }
-
- while (true) {
- certs.emplace_back(0, Certificate::KEY_TYPE_RSA, nullptr, nullptr);
- Certificate& cert = certs.back();
- uint32_t exponent = 0;
-
- char start_char;
- if (fscanf(f.get(), " %c", &start_char) != 1) return false;
- if (start_char == '{') {
- // a version 1 key has no version specifier.
- cert.key_type = Certificate::KEY_TYPE_RSA;
- exponent = 3;
- cert.hash_len = SHA_DIGEST_LENGTH;
- } else if (start_char == 'v') {
- int version;
- if (fscanf(f.get(), "%d {", &version) != 1) return false;
- switch (version) {
- case 2:
- cert.key_type = Certificate::KEY_TYPE_RSA;
- exponent = 65537;
- cert.hash_len = SHA_DIGEST_LENGTH;
- break;
- case 3:
- cert.key_type = Certificate::KEY_TYPE_RSA;
- exponent = 3;
- cert.hash_len = SHA256_DIGEST_LENGTH;
- break;
- case 4:
- cert.key_type = Certificate::KEY_TYPE_RSA;
- exponent = 65537;
- cert.hash_len = SHA256_DIGEST_LENGTH;
- break;
- case 5:
- cert.key_type = Certificate::KEY_TYPE_EC;
- cert.hash_len = SHA256_DIGEST_LENGTH;
- break;
- default:
- return false;
- }
- }
-
- if (cert.key_type == Certificate::KEY_TYPE_RSA) {
- cert.rsa = parse_rsa_key(f.get(), exponent);
- if (!cert.rsa) {
- return false;
- }
-
- LOG(INFO) << "read key e=" << exponent << " hash=" << cert.hash_len;
- } else if (cert.key_type == Certificate::KEY_TYPE_EC) {
- cert.ec = parse_ec_key(f.get());
- if (!cert.ec) {
- return false;
- }
- } else {
- LOG(ERROR) << "Unknown key type " << cert.key_type;
- return false;
- }
-
- // if the line ends in a comma, this file has more keys.
- int ch = fgetc(f.get());
- if (ch == ',') {
- // more keys to come.
- continue;
- } else if (ch == EOF) {
- break;
- } else {
- LOG(ERROR) << "unexpected character between keys";
- return false;
- }
- }
- return true;
-}
diff --git a/verifier.h b/verifier.h
index 944823293..df9a4b648 100644
--- a/verifier.h
+++ b/verifier.h
@@ -70,8 +70,6 @@ struct Certificate {
int verify_file(const unsigned char* addr, size_t length, const std::vector<Certificate>& keys,
const std::function<void(float)>& set_progress = nullptr);
-bool load_keys(const char* filename, std::vector<Certificate>& certs);
-
// Checks that the RSA key has a modulus of 2048 bits long, and public exponent is 3 or 65537.
bool CheckRSAKey(const std::unique_ptr<RSA, RSADeleter>& rsa);