1 #define TAG "ext4_utils"
3 #include "ext4_crypt_init_extensions.h"
12 #include <cutils/klog.h>
13 #include <cutils/properties.h>
14 #include <cutils/sockets.h>
17 #include "key_control.h"
18 #include "unencrypted_properties.h"
20 static const std::string arbitrary_sequence_number = "42";
21 static const int vold_command_timeout_ms = 60 * 1000;
23 static std::string vold_command(std::string const& command)
25 KLOG_INFO(TAG, "Running command %s\n", command.c_str());
29 sock = socket_local_client("cryptd",
30 ANDROID_SOCKET_NAMESPACE_RESERVED,
39 KLOG_INFO(TAG, "Cannot open vold, failing command\n");
47 CloseSocket(int sock) : sock_(sock) {}
48 ~CloseSocket() { close(sock_); }
53 // Use arbitrary sequence number. This should only be used when the
54 // framework is down, so this is (mostly) OK.
55 std::string actual_command = arbitrary_sequence_number + " " + command;
56 if (write(sock, actual_command.c_str(), actual_command.size() + 1) < 0) {
57 KLOG_ERROR(TAG, "Cannot write command\n");
61 struct pollfd poll_sock = {sock, POLLIN, 0};
63 int rc = poll(&poll_sock, 1, vold_command_timeout_ms);
65 KLOG_ERROR(TAG, "Error in poll %s\n", strerror(errno));
68 if (!(poll_sock.revents & POLLIN)) {
69 KLOG_ERROR(TAG, "Timeout\n");
73 memset(buffer, 0, sizeof(buffer));
74 rc = read(sock, buffer, sizeof(buffer));
77 KLOG_ERROR(TAG, "Lost connection to Vold - did it crash?\n");
79 KLOG_ERROR(TAG, "Error reading data (%s)\n", strerror(errno));
84 // We don't truly know that this is the correct result. However,
85 // since this will only be used when the framework is down,
86 // it should be OK unless someone is running vdc at the same time.
87 // Worst case we force a reboot in the very rare synchronization
89 return std::string(buffer, rc);
92 int e4crypt_create_device_key(const char* dir,
93 int ensure_dir_exists(const char*))
95 // Already encrypted with password? If so bail
96 std::string temp_folder = std::string() + dir + "/tmp_mnt";
97 DIR* temp_dir = opendir(temp_folder.c_str());
103 // Make sure folder exists. Use make_dir to set selinux permissions.
104 if (ensure_dir_exists(UnencryptedProperties::GetPath(dir).c_str())) {
105 KLOG_ERROR(TAG, "Failed to create %s with error %s\n",
106 UnencryptedProperties::GetPath(dir).c_str(),
111 auto result = vold_command("cryptfs enablefilecrypto");
112 // ext4enc:TODO proper error handling
113 KLOG_INFO(TAG, "enablefilecrypto returned with result %s\n",
119 int e4crypt_install_keyring()
121 key_serial_t device_keyring = add_key("keyring", "e4crypt", 0, 0,
122 KEY_SPEC_SESSION_KEYRING);
124 if (device_keyring == -1) {
125 KLOG_ERROR(TAG, "Failed to create keyring\n");
129 KLOG_INFO(TAG, "Keyring created wth id %d in process %d\n",
130 device_keyring, getpid());
135 int e4crypt_set_directory_policy(const char* dir)
137 // Only set policy on first level /data directories
138 // To make this less restrictive, consider using a policy file.
139 // However this is overkill for as long as the policy is simply
140 // to apply a global policy to all /data folders created via makedir
141 if (!dir || strncmp(dir, "/data/", 6) || strchr(dir + 6, '/')) {
144 // ext4enc:TODO exclude /data/user with a horrible special case.
145 if (!strcmp(dir, "/data/user")) {
149 UnencryptedProperties props("/data");
150 std::string policy = props.Get<std::string>(properties::ref);
151 if (policy.empty()) {
152 // ext4enc:TODO why is this OK?
156 KLOG_INFO(TAG, "Setting policy on %s\n", dir);
157 int result = do_policy_set(dir, policy.c_str(), policy.size());
159 KLOG_ERROR(TAG, "Setting %s policy on %s failed!\n",
160 policy.c_str(), dir);
167 int e4crypt_set_user_crypto_policies(const char* dir)
169 auto command = std::string() + "cryptfs setusercryptopolicies " + dir;
170 auto result = vold_command(command);
171 // ext4enc:TODO proper error handling
172 KLOG_INFO(TAG, "setusercryptopolicies returned with result %s\n",