1 files changed, 215 insertions, 0 deletions
diff --git a/crypto/ext4crypt/KeyUtil.cpp b/crypto/ext4crypt/KeyUtil.cpp
new file mode 100644
index 000000000..946c6cf9c
--- /dev/null
+++ b/crypto/ext4crypt/KeyUtil.cpp
@@ -0,0 +1,215 @@
+/*
+ * 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.
+ */
+
+#include "KeyUtil.h"
+
+#include <iomanip>
+#include <sstream>
+#include <string>
+
+#include <openssl/sha.h>
+
+#include <android-base/file.h>
+//#include <android-base/logging.h>
+#include <keyutils.h>
+
+#include "KeyStorage4.h"
+#include "Utils.h"
+
+#include <iostream>
+#define LOG(x) std::cout
+#define PLOG(x) std::cout
+#include <sys/types.h>
+#include <unistd.h>
+
+namespace android {
+namespace vold {
+
+// ext4enc:TODO get this const from somewhere good
+const int EXT4_KEY_DESCRIPTOR_SIZE = 8;
+
+// ext4enc:TODO Include structure from somewhere sensible
+// MUST be in sync with ext4_crypto.c in kernel
+constexpr int EXT4_ENCRYPTION_MODE_AES_256_XTS = 1;
+constexpr int EXT4_AES_256_XTS_KEY_SIZE = 64;
+constexpr int EXT4_MAX_KEY_SIZE = 64;
+struct ext4_encryption_key {
+    uint32_t mode;
+    char raw[EXT4_MAX_KEY_SIZE];
+    uint32_t size;
+};
+
+bool randomKey(KeyBuffer* key) {
+    *key = KeyBuffer(EXT4_AES_256_XTS_KEY_SIZE);
+    if (ReadRandomBytes(key->size(), key->data()) != 0) {
+        // TODO status_t plays badly with PLOG, fix it.
+        LOG(ERROR) << "Random read failed" << std::endl;
+        return false;
+    }
+    return true;
+}
+
+// Get raw keyref - used to make keyname and to pass to ioctl
+static std::string generateKeyRef(const char* key, int length) {
+    SHA512_CTX c;
+
+    SHA512_Init(&c);
+    SHA512_Update(&c, key, length);
+    unsigned char key_ref1[SHA512_DIGEST_LENGTH];
+    SHA512_Final(key_ref1, &c);
+
+    SHA512_Init(&c);
+    SHA512_Update(&c, key_ref1, SHA512_DIGEST_LENGTH);
+    unsigned char key_ref2[SHA512_DIGEST_LENGTH];
+    SHA512_Final(key_ref2, &c);
+
+    static_assert(EXT4_KEY_DESCRIPTOR_SIZE <= SHA512_DIGEST_LENGTH,
+                  "Hash too short for descriptor");
+    return std::string((char*)key_ref2, EXT4_KEY_DESCRIPTOR_SIZE);
+}
+
+static bool fillKey(const KeyBuffer& key, ext4_encryption_key* ext4_key) {
+    if (key.size() != EXT4_AES_256_XTS_KEY_SIZE) {
+        LOG(ERROR) << "Wrong size key " << key.size();
+        return false;
+    }
+    static_assert(EXT4_AES_256_XTS_KEY_SIZE <= sizeof(ext4_key->raw), "Key too long!");
+    ext4_key->mode = EXT4_ENCRYPTION_MODE_AES_256_XTS;
+    ext4_key->size = key.size();
+    memset(ext4_key->raw, 0, sizeof(ext4_key->raw));
+    memcpy(ext4_key->raw, key.data(), key.size());
+    return true;
+}
+
+static char const* const NAME_PREFIXES[] = {
+    "ext4",
+    "f2fs",
+    "fscrypt",
+    nullptr
+};
+
+static std::string keyname(const std::string& prefix, const std::string& raw_ref) {
+    std::ostringstream o;
+    o << prefix << ":";
+    for (unsigned char i : raw_ref) {
+        o << std::hex << std::setw(2) << std::setfill('0') << (int)i;
+    }
+    return o.str();
+}
+
+// Get the keyring we store all keys in
+static bool e4cryptKeyring(key_serial_t* device_keyring) {
+    *device_keyring = keyctl_search(KEY_SPEC_SESSION_KEYRING, "keyring", "e4crypt", 0);
+    if (*device_keyring == -1) {
+        PLOG(ERROR) << "Unable to find device keyring" << std::endl;
+        return false;
+    }
+    return true;
+}
+
+// Install password into global keyring
+// Return raw key reference for use in policy
+bool installKey(const KeyBuffer& key, std::string* raw_ref) {
+    // Place ext4_encryption_key into automatically zeroing buffer.
+    KeyBuffer ext4KeyBuffer(sizeof(ext4_encryption_key));
+    ext4_encryption_key &ext4_key = *reinterpret_cast<ext4_encryption_key*>(ext4KeyBuffer.data());
+
+    if (!fillKey(key, &ext4_key)) return false;
+    *raw_ref = generateKeyRef(ext4_key.raw, ext4_key.size);
+    key_serial_t device_keyring;
+    if (!e4cryptKeyring(&device_keyring)) return false;
+    for (char const* const* name_prefix = NAME_PREFIXES; *name_prefix != nullptr; name_prefix++) {
+        auto ref = keyname(*name_prefix, *raw_ref);
+        key_serial_t key_id =
+            add_key("logon", ref.c_str(), (void*)&ext4_key, sizeof(ext4_key), device_keyring);
+        if (key_id == -1) {
+            PLOG(ERROR) << "Failed to insert key into keyring " << device_keyring << std::endl;
+            return false;
+        }
+        LOG(DEBUG) << "Added key " << key_id << " (" << ref << ") to keyring " << device_keyring
+                   << " in process " << getpid() << std::endl;
+    }
+    return true;
+}
+
+bool evictKey(const std::string& raw_ref) {
+	LOG(ERROR) << "not actually evicting key\n";
+	return true;
+    key_serial_t device_keyring;
+    if (!e4cryptKeyring(&device_keyring)) return false;
+    bool success = true;
+    for (char const* const* name_prefix = NAME_PREFIXES; *name_prefix != nullptr; name_prefix++) {
+        auto ref = keyname(*name_prefix, raw_ref);
+        auto key_serial = keyctl_search(device_keyring, "logon", ref.c_str(), 0);
+
+        // Unlink the key from the keyring.  Prefer unlinking to revoking or
+        // invalidating, since unlinking is actually no less secure currently, and
+        // it avoids bugs in certain kernel versions where the keyring key is
+        // referenced from places it shouldn't be.
+        if (keyctl_unlink(key_serial, device_keyring) != 0) {
+            PLOG(ERROR) << "Failed to unlink key with serial " << key_serial << " ref " << ref;
+            success = false;
+        } else {
+            LOG(DEBUG) << "Unlinked key with serial " << key_serial << " ref " << ref;
+        }
+    }
+    return success;
+}
+
+bool retrieveAndInstallKey(bool create_if_absent, const KeyAuthentication& key_authentication,
+                           const std::string& key_path, const std::string& tmp_path,
+                           std::string* key_ref) {
+    KeyBuffer key;
+    if (pathExists(key_path)) {
+        LOG(DEBUG) << "Key exists, using: " << key_path << std::endl;
+        if (!retrieveKey(key_path, key_authentication, &key)) return false;
+    } else {
+        if (!create_if_absent) {
+           LOG(ERROR) << "No key found in " << key_path << std::endl;
+           return false;
+        }
+        LOG(INFO) << "Creating new key in " << key_path << std::endl;
+        if (!randomKey(&key)) return false;
+        if (!storeKeyAtomically(key_path, tmp_path, key_authentication, key)) return false;
+    }
+
+    if (!installKey(key, key_ref)) {
+        LOG(ERROR) << "Failed to install key in " << key_path << std::endl;
+        return false;
+    }
+    return true;
+}
+
+bool retrieveKey(bool create_if_absent, const std::string& key_path,
+                 const std::string& tmp_path, KeyBuffer* key) {
+    if (pathExists(key_path)) {
+        LOG(DEBUG) << "Key exists, using: " << key_path << std::endl;
+        if (!retrieveKey(key_path, kEmptyAuthentication, key)) return false;
+    } else {
+        if (!create_if_absent) {
+           LOG(ERROR) << "No key found in " << key_path << std::endl;
+           return false;
+        }
+        LOG(INFO) << "Creating new key in " << key_path << std::endl;
+        if (!randomKey(key)) return false;
+        if (!storeKeyAtomically(key_path, tmp_path,
+                kEmptyAuthentication, *key)) return false;
+    }
+    return true;
+}
+
+}  // namespace vold
+}  // namespace android