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Merge "Strictly enforce DeviceInfo entries."

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This commit is contained in:
Max Bires
2023-03-24 16:18:46 +00:00
committed by Gerrit Code Review
parent 48e5787888 60c53aeb7e
commit 6f135a7a19
1 changed files with 60 additions and 11 deletions
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71
security/keymint/support/remote_prov_utils.cpp
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@@ -22,6 +22,7 @@
#include "aidl/android/hardware/security/keymint/IRemotelyProvisionedComponent.h"
#include <aidl/android/hardware/security/keymint/RpcHardwareInfo.h>
#include <android-base/macros.h>
#include <android-base/properties.h>
#include <cppbor.h>
#include <hwtrust/hwtrust.h>
@@ -43,6 +44,7 @@ constexpr uint32_t kBccPayloadSubject = 2;
constexpr int32_t kBccPayloadSubjPubKey = -4670552;
constexpr int32_t kBccPayloadKeyUsage = -4670553;
constexpr int kP256AffinePointSize = 32;
constexpr uint32_t kNumTeeDeviceInfoEntries = 14;
using EC_KEY_Ptr = bssl::UniquePtr<EC_KEY>;
using EVP_PKEY_Ptr = bssl::UniquePtr<EVP_PKEY>;
@@ -388,6 +390,11 @@ std::string checkMapEntry(bool isFactory, const cppbor::Map& devInfo, cppbor::Ma
return entryName + " has an invalid value.\n";
}
bool isTeeDeviceInfo(const cppbor::Map& devInfo) {
return devInfo.get("security_level") && devInfo.get("security_level")->asTstr() &&
devInfo.get("security_level")->asTstr()->value() == "tee";
}
ErrMsgOr<std::unique_ptr<cppbor::Map>> parseAndValidateDeviceInfo(
const std::vector<uint8_t>& deviceInfoBytes, IRemotelyProvisionedComponent* provisionable,
bool isFactory) {
@@ -396,6 +403,21 @@ ErrMsgOr<std::unique_ptr<cppbor::Map>> parseAndValidateDeviceInfo(
const cppbor::Array kValidSecurityLevels = {"tee", "strongbox"};
const cppbor::Array kValidAttIdStates = {"locked", "open"};
const cppbor::Array kValidFused = {0, 1};
constexpr std::array<std::string_view, kNumTeeDeviceInfoEntries> kDeviceInfoKeys = {
"brand",
"manufacturer",
"product",
"model",
"device",
"vb_state",
"bootloader_state",
"vbmeta_digest",
"os_version",
"system_patch_level",
"boot_patch_level",
"vendor_patch_level",
"security_level",
"fused"};
struct AttestationIdEntry {
const char* id;
@@ -439,20 +461,48 @@ ErrMsgOr<std::unique_ptr<cppbor::Map>> parseAndValidateDeviceInfo(
}
std::string error;
std::string tmp;
std::set<std::string_view> previousKeys;
switch (info.versionNumber) {
case 3:
if (isTeeDeviceInfo(*parsed) && parsed->size() != kNumTeeDeviceInfoEntries) {
error += fmt::format(
"Err: Incorrect number of device info entries. Expected {} but got"
"{}\n",
kNumTeeDeviceInfoEntries, parsed->size());
}
// TEE IRPC instances require all entries to be present in DeviceInfo. Non-TEE instances
// may omit `os_version`
if (!isTeeDeviceInfo(*parsed) && (parsed->size() != kNumTeeDeviceInfoEntries ||
parsed->size() != kNumTeeDeviceInfoEntries - 1)) {
error += fmt::format(
"Err: Incorrect number of device info entries. Expected {} or {} but got"
"{}\n",
kNumTeeDeviceInfoEntries - 1, kNumTeeDeviceInfoEntries, parsed->size());
}
for (auto& [key, _] : *parsed) {
const std::string& keyValue = key->asTstr()->value();
if (!previousKeys.insert(keyValue).second) {
error += "Err: Duplicate device info entry: <" + keyValue + ">,\n";
}
if (std::find(kDeviceInfoKeys.begin(), kDeviceInfoKeys.end(), keyValue) ==
kDeviceInfoKeys.end()) {
error += "Err: Unrecognized key entry: <" + key->asTstr()->value() + ">,\n";
}
}
FALLTHROUGH_INTENDED;
case 2:
for (const auto& entry : kAttestationIdEntrySet) {
error += checkMapEntry(isFactory && !entry.alwaysValidate, *parsed, cppbor::TSTR,
entry.id);
tmp = checkMapEntry(isFactory && !entry.alwaysValidate, *parsed, cppbor::TSTR,
entry.id);
}
if (!error.empty()) {
return error +
"Attestation IDs are missing or malprovisioned. If this test is being\n"
"run against an early proto or EVT build, this error is probably WAI\n"
"and indicates that Device IDs were not provisioned in the factory. If\n"
"this error is returned on a DVT or later build revision, then\n"
"something is likely wrong with the factory provisioning process.";
if (!tmp.empty()) {
error += tmp +
"Attestation IDs are missing or malprovisioned. If this test is being\n"
"run against an early proto or EVT build, this error is probably WAI\n"
"and indicates that Device IDs were not provisioned in the factory. If\n"
"this error is returned on a DVT or later build revision, then\n"
"something is likely wrong with the factory provisioning process.";
}
// TODO: Refactor the KeyMint code that validates these fields and include it here.
error += checkMapEntry(isFactory, *parsed, cppbor::TSTR, "vb_state", kValidVbStates);
@@ -465,8 +515,7 @@ ErrMsgOr<std::unique_ptr<cppbor::Map>> parseAndValidateDeviceInfo(
error += checkMapEntry(isFactory, *parsed, cppbor::UINT, "fused", kValidFused);
error += checkMapEntry(isFactory, *parsed, cppbor::TSTR, "security_level",
kValidSecurityLevels);
if (parsed->get("security_level") && parsed->get("security_level")->asTstr() &&
parsed->get("security_level")->asTstr()->value() == "tee") {
if (isTeeDeviceInfo(*parsed)) {
error += checkMapEntry(isFactory, *parsed, cppbor::TSTR, "os_version");
}
break;