Paul Crowley
9 years ago
committed by
Android (Google) Code Review
commit
c5fdb4b8d3
@ -0,0 +1,254 @@
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/*
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* Copyright (C) 2016 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include "KeyStorage.h"
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#include "Keymaster.h"
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#include "Utils.h"
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#include <vector>
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#include <errno.h>
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#include <sys/stat.h>
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#include <sys/types.h>
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#include <sys/wait.h>
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#include <unistd.h>
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#include <openssl/sha.h>
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#include <android-base/file.h>
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#include <android-base/logging.h>
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#include <keymaster/authorization_set.h>
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namespace android {
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namespace vold {
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static constexpr size_t AES_KEY_BYTES = 32;
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static constexpr size_t GCM_NONCE_BYTES = 12;
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static constexpr size_t GCM_MAC_BYTES = 16;
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// FIXME: better name than "secdiscardable" sought!
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static constexpr size_t SECDISCARDABLE_BYTES = 1<<14;
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static const char* kRmPath = "/system/bin/rm";
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static const char* kSecdiscardPath = "/system/bin/secdiscard";
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static const char* kFn_keymaster_key_blob = "keymaster_key_blob";
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static const char* kFn_encrypted_key = "encrypted_key";
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static const char* kFn_secdiscardable = "secdiscardable";
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static bool CheckSize(const std::string& kind, size_t actual, size_t expected) {
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if (actual != expected) {
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LOG(ERROR) << "Wrong number of bytes in " << kind << ", expected " << expected
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<< " got " << actual;
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return false;
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}
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return true;
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}
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static std::string HashSecdiscardable(const std::string &secdiscardable) {
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SHA512_CTX c;
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SHA512_Init(&c);
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// Personalise the hashing by introducing a fixed prefix.
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// Hashing applications should use personalization except when there is a
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// specific reason not to; see section 4.11 of https://www.schneier.com/skein1.3.pdf
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std::string secdiscardable_hashing_prefix = "Android secdiscardable SHA512";
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secdiscardable_hashing_prefix.resize(SHA512_CBLOCK);
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SHA512_Update(&c, secdiscardable_hashing_prefix.data(), secdiscardable_hashing_prefix.size());
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SHA512_Update(&c, secdiscardable.data(), secdiscardable.size());
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std::string res(SHA512_DIGEST_LENGTH, '\0');
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SHA512_Final(reinterpret_cast<uint8_t *>(&res[0]), &c);
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return res;
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}
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static bool GenerateKeymasterKey(Keymaster &keymaster,
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const keymaster::AuthorizationSet &extra_params,
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std::string &key) {
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keymaster::AuthorizationSetBuilder param_builder;
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param_builder
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.AesEncryptionKey(AES_KEY_BYTES * 8)
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.Authorization(keymaster::TAG_BLOCK_MODE, KM_MODE_GCM)
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.Authorization(keymaster::TAG_MIN_MAC_LENGTH, GCM_MAC_BYTES * 8)
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.Authorization(keymaster::TAG_PADDING, KM_PAD_NONE)
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.Authorization(keymaster::TAG_NO_AUTH_REQUIRED); // FIXME integrate with gatekeeper
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auto params = param_builder.build();
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params.push_back(extra_params);
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return keymaster.GenerateKey(params, key);
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}
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static bool EncryptWithKeymasterKey(
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Keymaster &keymaster,
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const std::string &key,
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const keymaster::AuthorizationSet &extra_params,
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const std::string &message,
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std::string &ciphertext) {
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// FIXME fix repetition
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keymaster::AuthorizationSetBuilder param_builder;
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param_builder
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.Authorization(keymaster::TAG_BLOCK_MODE, KM_MODE_GCM)
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.Authorization(keymaster::TAG_MAC_LENGTH, GCM_MAC_BYTES * 8)
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.Authorization(keymaster::TAG_PADDING, KM_PAD_NONE);
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auto params = param_builder.build();
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params.push_back(extra_params);
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keymaster::AuthorizationSet out_params;
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auto op_handle = keymaster.Begin(KM_PURPOSE_ENCRYPT, key, params, out_params);
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if (!op_handle) return false;
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keymaster_blob_t nonce_blob;
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if (!out_params.GetTagValue(keymaster::TAG_NONCE, &nonce_blob)) {
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LOG(ERROR) << "GCM encryption but no nonce generated";
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return false;
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}
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// nonce_blob here is just a pointer into existing data, must not be freed
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std::string nonce(reinterpret_cast<const char *>(nonce_blob.data), nonce_blob.data_length);
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if (!CheckSize("nonce", nonce.size(), GCM_NONCE_BYTES)) return false;
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std::string body;
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if (!op_handle.UpdateCompletely(message, body)) return false;
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std::string mac;
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if (!op_handle.FinishWithOutput(mac)) return false;
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if (!CheckSize("mac", mac.size(), GCM_MAC_BYTES)) return false;
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ciphertext = nonce + body + mac;
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return true;
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}
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static bool DecryptWithKeymasterKey(
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Keymaster &keymaster, const std::string &key,
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const keymaster::AuthorizationSet &extra_params,
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const std::string &ciphertext,
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std::string &message) {
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auto nonce = ciphertext.substr(0, GCM_NONCE_BYTES);
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auto body_mac = ciphertext.substr(GCM_NONCE_BYTES);
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// FIXME fix repetition
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keymaster::AuthorizationSetBuilder param_builder;
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param_builder
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.Authorization(keymaster::TAG_BLOCK_MODE, KM_MODE_GCM)
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.Authorization(keymaster::TAG_MAC_LENGTH, GCM_MAC_BYTES * 8)
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.Authorization(keymaster::TAG_PADDING, KM_PAD_NONE);
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AddStringParam(param_builder, keymaster::TAG_NONCE, nonce);
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auto params = param_builder.build();
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params.push_back(extra_params);
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auto op_handle = keymaster.Begin(KM_PURPOSE_DECRYPT, key, params);
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if (!op_handle) return false;
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if (!op_handle.UpdateCompletely(body_mac, message)) return false;
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if (!op_handle.Finish()) return false;
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return true;
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}
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bool StoreKey(const std::string &dir, const std::string &key) {
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if (TEMP_FAILURE_RETRY(mkdir(dir.c_str(), 0700)) == -1) {
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PLOG(ERROR) << "key mkdir " << dir;
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return false;
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}
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std::string secdiscardable;
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if (ReadRandomBytes(SECDISCARDABLE_BYTES, secdiscardable) != 0) {
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// TODO status_t plays badly with PLOG, fix it.
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LOG(ERROR) << "Random read failed";
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return false;
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}
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// FIXME create a wrapper around reads and writes which handles error logging
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if (!android::base::WriteStringToFile(secdiscardable, dir + "/" + kFn_secdiscardable)) {
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PLOG(ERROR) << "Unable to write secdiscardable to " << dir;
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return false;
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}
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keymaster::AuthorizationSetBuilder param_builder;
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AddStringParam(param_builder, keymaster::TAG_APPLICATION_ID,
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HashSecdiscardable(secdiscardable));
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auto extra_params = param_builder.build();
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Keymaster keymaster;
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if (!keymaster) return false;
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std::string km_key;
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if (!GenerateKeymasterKey(keymaster, extra_params, km_key)) return false;
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std::string encrypted_key;
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if (!EncryptWithKeymasterKey(
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keymaster, km_key, extra_params, key, encrypted_key)) return false;
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if (!android::base::WriteStringToFile(km_key, dir + "/" + kFn_keymaster_key_blob)) {
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PLOG(ERROR) << "Unable to write keymaster_key_blob to " << dir;
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return false;
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}
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if (!android::base::WriteStringToFile(encrypted_key, dir + "/" + kFn_encrypted_key)) {
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PLOG(ERROR) << "Unable to write encrypted_key to " << dir;
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return false;
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}
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return true;
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}
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bool RetrieveKey(const std::string &dir, std::string &key) {
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std::string secdiscardable;
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if (!android::base::ReadFileToString(dir + "/" + kFn_secdiscardable, &secdiscardable)) {
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PLOG(ERROR) << "Unable to read secdiscardable from " << dir;
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return false;
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}
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keymaster::AuthorizationSetBuilder param_builder;
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AddStringParam(param_builder, keymaster::TAG_APPLICATION_ID,
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HashSecdiscardable(secdiscardable));
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auto extra_params = param_builder.build();
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std::string km_key;
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if (!android::base::ReadFileToString(dir + "/" + kFn_keymaster_key_blob, &km_key)) {
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PLOG(ERROR) << "Unable to read keymaster_key_blob from " << dir;
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return false;
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}
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std::string encrypted_message;
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if (!android::base::ReadFileToString(dir + "/" + kFn_encrypted_key, &encrypted_message)) {
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PLOG(ERROR) << "Unable to read encrypted_key to " << dir;
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return false;
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}
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Keymaster keymaster;
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if (!keymaster) return false;
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return DecryptWithKeymasterKey(keymaster, km_key, extra_params, encrypted_message, key);
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}
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static bool DeleteKey(const std::string &dir) {
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std::string km_key;
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if (!android::base::ReadFileToString(dir + "/" + kFn_keymaster_key_blob, &km_key)) {
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PLOG(ERROR) << "Unable to read keymaster_key_blob from " << dir;
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return false;
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}
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Keymaster keymaster;
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if (!keymaster) return false;
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if (!keymaster.DeleteKey(km_key)) return false;
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return true;
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}
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static bool SecdiscardSecdiscardable(const std::string &dir) {
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if (ForkExecvp(std::vector<std::string> {
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kSecdiscardPath, "--", dir + "/" + kFn_secdiscardable}) != 0) {
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LOG(ERROR) << "secdiscard failed";
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return false;
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}
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return true;
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}
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static bool RecursiveDeleteKey(const std::string &dir) {
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if (ForkExecvp(std::vector<std::string> {
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kRmPath, "-rf", dir}) != 0) {
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LOG(ERROR) << "recursive delete failed";
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return false;
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}
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return true;
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}
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bool DestroyKey(const std::string &dir) {
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bool success = true;
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// Try each thing, even if previous things failed.
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success &= DeleteKey(dir);
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success &= SecdiscardSecdiscardable(dir);
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success &= RecursiveDeleteKey(dir);
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return success;
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}
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} // namespace vold
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} // namespace android
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@ -0,0 +1,40 @@
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/*
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* Copyright (C) 2016 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#ifndef ANDROID_VOLD_KEYSTORAGE_H
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#define ANDROID_VOLD_KEYSTORAGE_H
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#include <string>
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namespace android {
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namespace vold {
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// Create a directory at the named path, and store "key" in it,
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// in such a way that it can only be retrieved via Keymaster and
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// can be securely deleted.
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// It's safe to move/rename the directory after creation.
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bool StoreKey(const std::string &target_dir, const std::string &key);
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// Retrieve the key from the named directory.
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bool RetrieveKey(const std::string &dir, std::string &key);
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// Securely destroy the key stored in the named directory and delete the directory.
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bool DestroyKey(const std::string &dir);
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} // namespace vold
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} // namespace android
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#endif
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@ -0,0 +1,159 @@
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/*
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* Copyright (C) 2016 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include "Keymaster.h"
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#include <android-base/logging.h>
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namespace android {
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namespace vold {
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bool KeymasterOperation::UpdateCompletely(
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const std::string &input,
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std::string &output) {
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output.clear();
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auto it = input.begin();
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while (it != input.end()) {
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size_t to_read = static_cast<size_t>(input.end() - it);
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keymaster_blob_t input_blob {reinterpret_cast<const uint8_t *>(&*it), to_read};
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keymaster_blob_t output_blob;
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size_t input_consumed;
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auto error = device->update(device, op_handle,
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nullptr, &input_blob, &input_consumed, nullptr, &output_blob);
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if (error != KM_ERROR_OK) {
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LOG(ERROR) << "update failed, code " << error;
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device = nullptr;
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return false;
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}
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output.append(reinterpret_cast<const char *>(output_blob.data), output_blob.data_length);
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free(const_cast<uint8_t *>(output_blob.data));
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if (input_consumed > to_read) {
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LOG(ERROR) << "update reported too much input consumed";
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device = nullptr;
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return false;
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}
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it += input_consumed;
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}
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return true;
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}
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bool KeymasterOperation::Finish() {
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auto error = device->finish(device, op_handle,
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nullptr, nullptr, nullptr, nullptr);
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device = nullptr;
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if (error != KM_ERROR_OK) {
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LOG(ERROR) << "finish failed, code " << error;
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return false;
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}
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return true;
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}
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bool KeymasterOperation::FinishWithOutput(std::string &output) {
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keymaster_blob_t output_blob;
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auto error = device->finish(device, op_handle,
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nullptr, nullptr, nullptr, &output_blob);
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device = nullptr;
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if (error != KM_ERROR_OK) {
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LOG(ERROR) << "finish failed, code " << error;
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return false;
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}
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output.assign(reinterpret_cast<const char *>(output_blob.data), output_blob.data_length);
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free(const_cast<uint8_t *>(output_blob.data));
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return true;
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}
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Keymaster::Keymaster() {
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device = nullptr;
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const hw_module_t *module;
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int ret = hw_get_module_by_class(KEYSTORE_HARDWARE_MODULE_ID, NULL, &module);
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if (ret != 0) {
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LOG(ERROR) << "hw_get_module_by_class returned " << ret;
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return;
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}
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// TODO: This will need to be updated to support keymaster2.
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if (module->module_api_version != KEYMASTER_MODULE_API_VERSION_1_0) {
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LOG(ERROR) << "module_api_version is " << module->module_api_version;
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return;
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}
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ret = keymaster1_open(module, &device);
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if (ret != 0) {
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LOG(ERROR) << "keymaster1_open returned " << ret;
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device = nullptr;
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return;
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}
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}
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bool Keymaster::GenerateKey(
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const keymaster::AuthorizationSet &in_params,
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std::string &key) {
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keymaster_key_blob_t key_blob;
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auto error = device->generate_key(device, &in_params, &key_blob, nullptr);
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if (error != KM_ERROR_OK) {
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LOG(ERROR) << "generate_key failed, code " << error;
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return false;
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}
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key.assign(reinterpret_cast<const char *>(key_blob.key_material), key_blob.key_material_size);
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return true;
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}
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bool Keymaster::DeleteKey(const std::string &key) {
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if (device->delete_key == nullptr) return true;
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keymaster_key_blob_t key_blob { reinterpret_cast<const uint8_t *>(key.data()), key.size() };
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auto error = device->delete_key(device, &key_blob);
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if (error != KM_ERROR_OK) {
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LOG(ERROR) << "delete_key failed, code " << error;
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return false;
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}
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return true;
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}
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KeymasterOperation Keymaster::Begin(
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keymaster_purpose_t purpose,
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const std::string &key,
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const keymaster::AuthorizationSet &in_params,
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keymaster::AuthorizationSet &out_params) {
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keymaster_key_blob_t key_blob { reinterpret_cast<const uint8_t *>(key.data()), key.size() };
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keymaster_operation_handle_t op_handle;
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keymaster_key_param_set_t out_params_set;
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auto error = device->begin(device, purpose,
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&key_blob, &in_params, &out_params_set, &op_handle);
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if (error != KM_ERROR_OK) {
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LOG(ERROR) << "begin failed, code " << error;
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return KeymasterOperation(nullptr, op_handle);
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}
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out_params.Clear();
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out_params.push_back(out_params_set);
|
||||
keymaster_free_param_set(&out_params_set);
|
||||
return KeymasterOperation(device, op_handle);
|
||||
}
|
||||
|
||||
KeymasterOperation Keymaster::Begin(
|
||||
keymaster_purpose_t purpose,
|
||||
const std::string &key,
|
||||
const keymaster::AuthorizationSet &in_params) {
|
||||
keymaster_key_blob_t key_blob { reinterpret_cast<const uint8_t *>(key.data()), key.size() };
|
||||
keymaster_operation_handle_t op_handle;
|
||||
auto error = device->begin(device, purpose,
|
||||
&key_blob, &in_params, nullptr, &op_handle);
|
||||
if (error != KM_ERROR_OK) {
|
||||
LOG(ERROR) << "begin failed, code " << error;
|
||||
return KeymasterOperation(nullptr, op_handle);
|
||||
}
|
||||
return KeymasterOperation(device, op_handle);
|
||||
}
|
||||
|
||||
} // namespace vold
|
||||
} // namespace android
|
||||
@ -0,0 +1,114 @@
|
||||
/*
|
||||
* Copyright (C) 2016 The Android Open Source Project
|
||||
*
|
||||
* Licensed under the Apache License, Version 2.0 (the "License");
|
||||
* you may not use this file except in compliance with the License.
|
||||
* You may obtain a copy of the License at
|
||||
*
|
||||
* http://www.apache.org/licenses/LICENSE-2.0
|
||||
*
|
||||
* Unless required by applicable law or agreed to in writing, software
|
||||
* distributed under the License is distributed on an "AS IS" BASIS,
|
||||
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
||||
* See the License for the specific language governing permissions and
|
||||
* limitations under the License.
|
||||
*/
|
||||
|
||||
#ifndef ANDROID_VOLD_KEYMASTER1_H
|
||||
#define ANDROID_VOLD_KEYMASTER1_H
|
||||
|
||||
#include <string>
|
||||
|
||||
#include <hardware/hardware.h>
|
||||
#include <hardware/keymaster1.h>
|
||||
|
||||
#include <keymaster/authorization_set.h>
|
||||
|
||||
namespace android {
|
||||
namespace vold {
|
||||
|
||||
using namespace keymaster;
|
||||
|
||||
// C++ wrappers to the keymaster1 C interface.
|
||||
// This is tailored to the needs of KeyStorage, but could be extended to be
|
||||
// a more general interface.
|
||||
|
||||
|
||||
// Wrapper for a keymaster_operation_handle_t representing an
|
||||
// ongoing Keymaster operation. Aborts the operation
|
||||
// in the destructor if it is unfinished. Methods log failures
|
||||
// to LOG(ERROR).
|
||||
class KeymasterOperation {
|
||||
public:
|
||||
~KeymasterOperation() { if (device) device->abort(device, op_handle); }
|
||||
// Is this instance valid? This is false if creation fails, and becomes
|
||||
// false on finish or if an update fails.
|
||||
explicit operator bool() {return device != nullptr;}
|
||||
// Call "update" repeatedly until all of the input is consumed, and
|
||||
// concatenate the output. Return true on success.
|
||||
bool UpdateCompletely(const std::string &input, std::string &output);
|
||||
// Finish; pass nullptr for the "output" param.
|
||||
bool Finish();
|
||||
// Finish and write the output to this string.
|
||||
bool FinishWithOutput(std::string &output);
|
||||
// Move constructor
|
||||
KeymasterOperation(KeymasterOperation&& rhs) {
|
||||
op_handle = rhs.op_handle;
|
||||
device = rhs.device;
|
||||
rhs.device = nullptr;
|
||||
}
|
||||
// Move assignation.
|
||||
KeymasterOperation& operator=(KeymasterOperation&& rhs) {
|
||||
op_handle = rhs.op_handle;
|
||||
device = rhs.device;
|
||||
rhs.device = nullptr;
|
||||
return *this;
|
||||
}
|
||||
|
||||
private:
|
||||
KeymasterOperation(keymaster1_device_t *d, keymaster_operation_handle_t h):
|
||||
device {d}, op_handle {h} {}
|
||||
keymaster1_device_t *device;
|
||||
keymaster_operation_handle_t op_handle;
|
||||
DISALLOW_COPY_AND_ASSIGN(KeymasterOperation);
|
||||
friend class Keymaster;
|
||||
};
|
||||
|
||||
// Wrapper for a keymaster1_device_t representing an open connection
|
||||
// to the keymaster, which is closed in the destructor.
|
||||
class Keymaster {
|
||||
public:
|
||||
Keymaster();
|
||||
~Keymaster() { if (device) keymaster1_close(device); }
|
||||
// false if we failed to open the keymaster device.
|
||||
explicit operator bool() {return device != nullptr;}
|
||||
// Generate a key in the keymaster from the given params.
|
||||
bool GenerateKey(const AuthorizationSet &in_params, std::string &key);
|
||||
// If the keymaster supports it, permanently delete a key.
|
||||
bool DeleteKey(const std::string &key);
|
||||
// Begin a new cryptographic operation, collecting output parameters.
|
||||
KeymasterOperation Begin(
|
||||
keymaster_purpose_t purpose,
|
||||
const std::string &key,
|
||||
const AuthorizationSet &in_params,
|
||||
AuthorizationSet &out_params);
|
||||
// Begin a new cryptographic operation; don't collect output parameters.
|
||||
KeymasterOperation Begin(
|
||||
keymaster_purpose_t purpose,
|
||||
const std::string &key,
|
||||
const AuthorizationSet &in_params);
|
||||
private:
|
||||
keymaster1_device_t *device;
|
||||
DISALLOW_COPY_AND_ASSIGN(Keymaster);
|
||||
};
|
||||
|
||||
template <keymaster_tag_t Tag>
|
||||
inline AuthorizationSetBuilder& AddStringParam(AuthorizationSetBuilder ¶ms,
|
||||
TypedTag<KM_BYTES, Tag> tag, const std::string& val) {
|
||||
return params.Authorization(tag, val.data(), val.size());
|
||||
}
|
||||
|
||||
} // namespace vold
|
||||
} // namespace android
|
||||
|
||||
#endif
|
||||
Loading…
Reference in new issue