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/*
* Copyright (C) 2019 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.
*/
/*
* A tool loads keys to keyring.
*/
#include <dirent.h>
#include <errno.h>
#include <error.h>
#include <stdio.h>
#include <sys/types.h>
#include <unistd.h>
#include <iostream>
#include <iterator>
#include <string>
#include <android-base/file.h>
#include <android-base/parseint.h>
#include <keyutils.h>
#include <mini_keyctl_utils.h>
constexpr int kMaxCertSize = 4096;
static void Usage(int exit_code) {
fprintf(stderr, "usage: mini-keyctl <action> [args,]\n");
fprintf(stderr, " mini-keyctl add <type> <desc> <data> <keyring>\n");
fprintf(stderr, " mini-keyctl padd <type> <desc> <keyring>\n");
fprintf(stderr, " mini-keyctl unlink <key> <keyring>\n");
fprintf(stderr, " mini-keyctl restrict_keyring <keyring>\n");
fprintf(stderr, " mini-keyctl security <key>\n");
_exit(exit_code);
}
static key_serial_t parseKeyOrDie(const char* str) {
key_serial_t key;
if (!android::base::ParseInt(str, &key)) {
error(1 /* exit code */, 0 /* errno */, "Unparsable key: '%s'\n", str);
}
return key;
}
int Unlink(key_serial_t key, const std::string& keyring) {
key_serial_t keyring_id = android::GetKeyringId(keyring);
if (keyctl_unlink(key, keyring_id) < 0) {
error(1, errno, "Failed to unlink key %x from keyring %s", key, keyring.c_str());
return 1;
}
return 0;
}
int Add(const std::string& type, const std::string& desc, const std::string& data,
const std::string& keyring) {
if (data.size() > kMaxCertSize) {
error(1, 0, "Certificate too large");
return 1;
}
key_serial_t keyring_id = android::GetKeyringId(keyring);
key_serial_t key = add_key(type.c_str(), desc.c_str(), data.c_str(), data.size(), keyring_id);
if (key < 0) {
error(1, errno, "Failed to add key");
return 1;
}
std::cout << key << std::endl;
return 0;
}
int Padd(const std::string& type, const std::string& desc, const std::string& keyring) {
key_serial_t keyring_id = android::GetKeyringId(keyring);
// read from stdin to get the certificates
std::istreambuf_iterator<char> begin(std::cin), end;
std::string data(begin, end);
if (data.size() > kMaxCertSize) {
error(1, 0, "Certificate too large");
return 1;
}
key_serial_t key = add_key(type.c_str(), desc.c_str(), data.c_str(), data.size(), keyring_id);
if (key < 0) {
error(1, errno, "Failed to add key");
return 1;
}
std::cout << key << std::endl;
return 0;
}
int RestrictKeyring(const std::string& keyring) {
key_serial_t keyring_id = android::GetKeyringId(keyring);
if (keyctl_restrict_keyring(keyring_id, nullptr, nullptr) < 0) {
error(1, errno, "Cannot restrict keyring '%s'", keyring.c_str());
return 1;
}
return 0;
}
std::string RetrieveSecurityContext(key_serial_t key) {
// Simply assume this size is enough in practice.
const int kMaxSupportedSize = 256;
std::string context;
context.resize(kMaxSupportedSize);
long retval = keyctl_get_security(key, context.data(), kMaxSupportedSize);
if (retval < 0) {
error(1, errno, "Cannot get security context of key %x", key);
return std::string();
}
if (retval > kMaxSupportedSize) {
error(1, 0, "The key has unexpectedly long security context than %d", kMaxSupportedSize);
return std::string();
}
context.resize(retval);
return context;
}
int main(int argc, const char** argv) {
if (argc < 2) Usage(1);
const std::string action = argv[1];
if (action == "add") {
if (argc != 6) Usage(1);
std::string type = argv[2];
std::string desc = argv[3];
std::string data = argv[4];
std::string keyring = argv[5];
return Add(type, desc, data, keyring);
} else if (action == "padd") {
if (argc != 5) Usage(1);
std::string type = argv[2];
std::string desc = argv[3];
std::string keyring = argv[4];
return Padd(type, desc, keyring);
} else if (action == "restrict_keyring") {
if (argc != 3) Usage(1);
std::string keyring = argv[2];
return RestrictKeyring(keyring);
} else if (action == "unlink") {
if (argc != 4) Usage(1);
key_serial_t key = parseKeyOrDie(argv[2]);
const std::string keyring = argv[3];
return Unlink(key, keyring);
} else if (action == "security") {
if (argc != 3) Usage(1);
const char* key_str = argv[2];
key_serial_t key = parseKeyOrDie(key_str);
std::string context = RetrieveSecurityContext(key);
if (context.empty()) {
perror(key_str);
return 1;
}
fprintf(stderr, "%s\n", context.c_str());
return 0;
} else {
fprintf(stderr, "Unrecognized action: %s\n", action.c_str());
Usage(1);
}
return 0;
}
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