From 4eb29280d9767021822697c4fa2c9115d0524a15 Mon Sep 17 00:00:00 2001 From: Sean Thomas Date: Fri, 8 Nov 2024 18:12:34 +0000 Subject: [PATCH] Expose more from hwtrust for DICE chain validation There are a lot of upcoming requirements (see below) that place restrictions on the CSR and the DICE chain. This is a first step to make some of the infrastructure necessary to utilize the already-existing functionality inside hwtrust. Bug: 372843164 Bug: 376297620 A lot of parsing happens in `remote_prov_utils`. It would be nice to have all parsing and validation occur in hwtrust. Test: atest VtsHalRemotelyProvisionedComponentTargetTest atest libkeymint_remote_prov_support_test Change-Id: I52383c0c62a6bb73554fd0771d2e7a8b366246c0 --- .../keymint/support/remote_prov_utils.cpp | 43 +++------- .../support/remote_prov_utils_test.cpp | 82 +++++++++++++++++++ 2 files changed, 95 insertions(+), 30 deletions(-) diff --git a/security/keymint/support/remote_prov_utils.cpp b/security/keymint/support/remote_prov_utils.cpp index 464d91233d..6a5b608b5e 100644 --- a/security/keymint/support/remote_prov_utils.cpp +++ b/security/keymint/support/remote_prov_utils.cpp @@ -1136,42 +1136,25 @@ ErrMsgOr> verifyProductionCsr( allowAnyMode); } -ErrMsgOr isCsrWithProperDiceChain(const std::vector& csr, +ErrMsgOr isCsrWithProperDiceChain(const std::vector& encodedCsr, const std::string& instanceName) { - auto [parsedRequest, _, csrErrMsg] = cppbor::parse(csr); - if (!parsedRequest) { - return csrErrMsg; - } - if (!parsedRequest->asArray()) { - return "AuthenticatedRequest is not a CBOR array."; - } - if (parsedRequest->asArray()->size() != 4U) { - return "AuthenticatedRequest must contain version, UDS certificates, DICE chain, and " - "signed data. However, the parsed AuthenticatedRequest has " + - std::to_string(parsedRequest->asArray()->size()) + " entries."; - } - - auto version = parsedRequest->asArray()->get(0)->asUint(); - auto diceCertChain = parsedRequest->asArray()->get(2)->asArray(); - - if (!version || version->value() != 1U) { - return "AuthenticatedRequest version must be an unsigned integer and must be equal to 1."; - } - if (!diceCertChain) { - return "AuthenticatedRequest DiceCertChain must be an Array."; - } - - // DICE chain is [ pubkey, + DiceChainEntry ]. auto diceChainKind = getDiceChainKind(); if (!diceChainKind) { return diceChainKind.message(); } - auto encodedDiceChain = diceCertChain->encode(); - auto chain = hwtrust::DiceChain::Verify(encodedDiceChain, *diceChainKind, - /*allowAnyMode=*/false, deviceSuffix(instanceName)); - if (!chain.ok()) return chain.error().message(); - return chain->IsProper(); + auto csr = hwtrust::Csr::validate(encodedCsr, *diceChainKind, false /*allowAnyMode*/, + deviceSuffix(instanceName)); + if (!csr.ok()) { + return csr.error().message(); + } + + auto diceChain = csr->getDiceChain(); + if (!diceChain.ok()) { + return diceChain.error().message(); + } + + return diceChain->IsProper(); } } // namespace aidl::android::hardware::security::keymint::remote_prov diff --git a/security/keymint/support/remote_prov_utils_test.cpp b/security/keymint/support/remote_prov_utils_test.cpp index 8ffb149bd7..58f1fc5b9c 100644 --- a/security/keymint/support/remote_prov_utils_test.cpp +++ b/security/keymint/support/remote_prov_utils_test.cpp @@ -82,6 +82,76 @@ inline const std::vector kDegenerateBcc{ 0x50, 0x12, 0x82, 0x37, 0xfe, 0xa4, 0x07, 0xc3, 0xd5, 0xc3, 0x78, 0xcc, 0xf9, 0xef, 0xe1, 0x95, 0x38, 0x9f, 0xb0, 0x79, 0x16, 0x4c, 0x4a, 0x23, 0xc4, 0xdc, 0x35, 0x4e, 0x0f}; +inline const std::vector kCsrWithDegenerateDiceChain{ + 0x85, 0x01, 0xa0, 0x82, 0xa6, 0x01, 0x02, 0x03, 0x26, 0x20, 0x01, 0x21, 0x58, 0x20, 0x65, + 0xe0, 0x51, 0x62, 0x45, 0x17, 0xcc, 0xa8, 0x40, 0x41, 0x6d, 0xc0, 0x86, 0x7a, 0x15, 0x6e, + 0xee, 0x04, 0xae, 0xbd, 0x05, 0x13, 0x36, 0xcb, 0xd2, 0x8d, 0xd8, 0x80, 0x16, 0xc1, 0x69, + 0x0d, 0x22, 0x58, 0x20, 0xea, 0xa1, 0x37, 0xd5, 0x01, 0xbd, 0xe0, 0x25, 0x6a, 0x3d, 0x4c, + 0xcd, 0x31, 0xa1, 0x4d, 0xa6, 0x80, 0x82, 0x03, 0x40, 0xe2, 0x88, 0x81, 0x53, 0xc3, 0xb3, + 0x6d, 0xf7, 0xf4, 0x10, 0xde, 0x96, 0x23, 0x58, 0x20, 0x24, 0x69, 0x44, 0x6e, 0xf5, 0xcc, + 0x18, 0xfe, 0x63, 0xac, 0x5e, 0x85, 0x9c, 0xfc, 0x9d, 0xfa, 0x90, 0xee, 0x6c, 0xc2, 0x22, + 0x49, 0x02, 0xc7, 0x93, 0xf4, 0x30, 0xf1, 0x51, 0x11, 0x20, 0x33, 0x84, 0x43, 0xa1, 0x01, + 0x26, 0xa0, 0x58, 0x97, 0xa5, 0x01, 0x66, 0x69, 0x73, 0x73, 0x75, 0x65, 0x72, 0x02, 0x67, + 0x73, 0x75, 0x62, 0x6a, 0x65, 0x63, 0x74, 0x3a, 0x00, 0x47, 0x44, 0x56, 0x41, 0x01, 0x3a, + 0x00, 0x47, 0x44, 0x57, 0x58, 0x70, 0xa6, 0x01, 0x02, 0x03, 0x26, 0x20, 0x01, 0x21, 0x58, + 0x20, 0x65, 0xe0, 0x51, 0x62, 0x45, 0x17, 0xcc, 0xa8, 0x40, 0x41, 0x6d, 0xc0, 0x86, 0x7a, + 0x15, 0x6e, 0xee, 0x04, 0xae, 0xbd, 0x05, 0x13, 0x36, 0xcb, 0xd2, 0x8d, 0xd8, 0x80, 0x16, + 0xc1, 0x69, 0x0d, 0x22, 0x58, 0x20, 0xea, 0xa1, 0x37, 0xd5, 0x01, 0xbd, 0xe0, 0x25, 0x6a, + 0x3d, 0x4c, 0xcd, 0x31, 0xa1, 0x4d, 0xa6, 0x80, 0x82, 0x03, 0x40, 0xe2, 0x88, 0x81, 0x53, + 0xc3, 0xb3, 0x6d, 0xf7, 0xf4, 0x10, 0xde, 0x96, 0x23, 0x58, 0x20, 0x24, 0x69, 0x44, 0x6e, + 0xf5, 0xcc, 0x18, 0xfe, 0x63, 0xac, 0x5e, 0x85, 0x9c, 0xfc, 0x9d, 0xfa, 0x90, 0xee, 0x6c, + 0xc2, 0x22, 0x49, 0x02, 0xc7, 0x93, 0xf4, 0x30, 0xf1, 0x51, 0x11, 0x20, 0x33, 0x3a, 0x00, + 0x47, 0x44, 0x58, 0x41, 0x20, 0x58, 0x40, 0x16, 0xb9, 0x51, 0xdf, 0x31, 0xad, 0xa0, 0x3d, + 0x98, 0x40, 0x85, 0xdf, 0xd9, 0xbe, 0xf6, 0x79, 0x62, 0x36, 0x8b, 0x60, 0xaa, 0x79, 0x8e, + 0x52, 0x04, 0xdd, 0xba, 0x39, 0xa2, 0x58, 0x9c, 0x60, 0xd5, 0x96, 0x51, 0x42, 0xe2, 0xa5, + 0x57, 0x58, 0xb4, 0x89, 0x2c, 0x94, 0xb9, 0xda, 0xe7, 0x93, 0x85, 0xda, 0x64, 0xa0, 0x52, + 0xfc, 0x6b, 0xb1, 0x0a, 0xa8, 0x13, 0xd9, 0x84, 0xfb, 0x34, 0x77, 0x84, 0x43, 0xa1, 0x01, + 0x26, 0xa0, 0x59, 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0x66, 0x2a, 0x07, + 0x3b, 0x1e, 0x23, 0x58, 0x20, 0x34, 0x7b, 0x15, 0xcc, 0xbf, 0x26, 0xc9, 0x28, 0x0e, 0xee, + 0xc5, 0x47, 0xac, 0x00, 0xc4, 0x4d, 0x81, 0x2b, 0x1e, 0xac, 0x31, 0xd2, 0x6f, 0x36, 0x85, + 0xe6, 0xa8, 0xf0, 0x46, 0xfc, 0xd2, 0x83, 0x58, 0x40, 0x55, 0x4c, 0x38, 0xdf, 0xfe, 0x49, + 0xa8, 0xa0, 0xa5, 0x08, 0xce, 0x2f, 0xe5, 0xf6, 0x6e, 0x2b, 0xc2, 0x95, 0x39, 0xc8, 0xca, + 0x77, 0xd6, 0xf6, 0x67, 0x24, 0x6b, 0x0e, 0x63, 0x5d, 0x11, 0x97, 0x26, 0x52, 0x30, 0xbc, + 0x28, 0x1d, 0xbf, 0x2a, 0x3e, 0x8c, 0x90, 0x54, 0xaa, 0xaa, 0xd1, 0x7c, 0x53, 0x7b, 0x48, + 0x1f, 0x51, 0x50, 0x6c, 0x32, 0xe1, 0x0f, 0x57, 0xea, 0x47, 0x76, 0x85, 0x0c, 0xa1, 0x6b, + 0x66, 0x69, 0x6e, 0x67, 0x65, 0x72, 0x70, 0x72, 0x69, 0x6e, 0x74, 0x78, 0x3b, 0x62, 0x72, + 0x61, 0x6e, 0x64, 0x31, 0x2f, 0x70, 0x72, 0x6f, 0x64, 0x75, 0x63, 0x74, 0x31, 0x2f, 0x64, + 0x65, 0x76, 0x69, 0x63, 0x65, 0x31, 0x3a, 0x31, 0x31, 0x2f, 0x69, 0x64, 0x2f, 0x32, 0x30, + 0x32, 0x31, 0x30, 0x38, 0x30, 0x35, 0x2e, 0x34, 0x32, 0x3a, 0x75, 0x73, 0x65, 0x72, 0x2f, + 0x72, 0x65, 0x6c, 0x65, 0x61, 0x73, 0x65, 0x2d, 0x6b, 0x65, 0x79, 0x73}; + // The challenge that is in kKeysToSignForCsrWithUdsCerts and kCsrWithUdsCerts inline const std::vector kChallenge{0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f, 0x10, @@ -557,6 +627,18 @@ TEST(RemoteProvUtilsTest, validateBccDegenerate) { DEFAULT_INSTANCE_NAME)); } +TEST(RemoteProvUtils, validateDiceChainProper) { + auto result = isCsrWithProperDiceChain(kCsrWithUdsCerts, DEFAULT_INSTANCE_NAME); + ASSERT_TRUE(result) << result.message(); + ASSERT_TRUE(*result) << "DICE Chain is degenerate"; +} + +TEST(RemoteProvUtils, validateDiceChainDegenerate) { + auto result = isCsrWithProperDiceChain(kCsrWithDegenerateDiceChain, DEFAULT_INSTANCE_NAME); + ASSERT_TRUE(result) << result.message(); + ASSERT_FALSE(*result) << "DICE Chain is proper"; +} + TEST(RemoteProvUtilsTest, requireUdsCertsWhenPresent) { auto [keysToSignPtr, _, errMsg] = cppbor::parse(kKeysToSignForCsrWithUdsCerts); ASSERT_TRUE(keysToSignPtr) << "Error: " << errMsg;