Convert fscrypt_set_directory_policy to C++
Bug: 140027478
Test: compiles, boots
Change-Id: Ic0c8b163fe37b11787cab49cc2eea38a1de377e9
diff --git a/init/builtins.cpp b/init/builtins.cpp
index c3bdc53..fb10a87 100644
--- a/init/builtins.cpp
+++ b/init/builtins.cpp
@@ -399,7 +399,7 @@
}
if (fscrypt_is_native()) {
- if (fscrypt_set_directory_policy(args[1].c_str())) {
+ if (fscrypt_set_directory_policy(args[1])) {
return reboot_into_recovery(
{"--prompt_and_wipe_data", "--reason=set_policy_failed:"s + args[1]});
}
diff --git a/init/fscrypt_init_extensions.cpp b/init/fscrypt_init_extensions.cpp
index 956228a..0f5a864 100644
--- a/init/fscrypt_init_extensions.cpp
+++ b/init/fscrypt_init_extensions.cpp
@@ -16,18 +16,9 @@
#include "fscrypt_init_extensions.h"
-#include <android-base/file.h>
-#include <android-base/logging.h>
-#include <android-base/stringprintf.h>
-#include <android-base/strings.h>
-#include <cutils/properties.h>
-#include <cutils/sockets.h>
#include <dirent.h>
#include <errno.h>
#include <fts.h>
-#include <fscrypt/fscrypt.h>
-#include <keyutils.h>
-#include <logwrap/logwrap.h>
#include <sys/mount.h>
#include <sys/stat.h>
#include <unistd.h>
@@ -35,15 +26,22 @@
#include <string>
#include <vector>
+#include <android-base/file.h>
+#include <android-base/logging.h>
+#include <android-base/stringprintf.h>
+#include <android-base/strings.h>
+#include <cutils/properties.h>
+#include <cutils/sockets.h>
+#include <fscrypt/fscrypt.h>
+#include <keyutils.h>
+#include <logwrap/logwrap.h>
#define TAG "fscrypt"
-static int set_system_de_policy_on(char const* dir);
+static int set_system_de_policy_on(const std::string& dir);
-int fscrypt_install_keyring()
-{
- key_serial_t device_keyring = add_key("keyring", "fscrypt", 0, 0,
- KEY_SPEC_SESSION_KEYRING);
+int fscrypt_install_keyring() {
+ key_serial_t device_keyring = add_key("keyring", "fscrypt", 0, 0, KEY_SPEC_SESSION_KEYRING);
if (device_keyring == -1) {
PLOG(ERROR) << "Failed to create keyring";
@@ -56,8 +54,8 @@
}
// TODO(b/139378601): use a single central implementation of this.
-static void delete_dir_contents(const char* dir) {
- char* const paths[2] = {const_cast<char*>(dir), nullptr};
+static void delete_dir_contents(const std::string& dir) {
+ char* const paths[2] = {const_cast<char*>(dir.c_str()), nullptr};
FTS* fts = fts_open(paths, FTS_PHYSICAL | FTS_NOCHDIR | FTS_XDEV, nullptr);
FTSENT* cur;
while ((cur = fts_read(fts)) != nullptr) {
@@ -65,7 +63,7 @@
PLOG(ERROR) << "fts_read";
break;
}
- if (strcmp(dir, cur->fts_path) == 0) {
+ if (dir == cur->fts_path) {
continue;
}
switch (cur->fts_info) {
@@ -96,16 +94,15 @@
}
}
-int fscrypt_set_directory_policy(const char* dir)
-{
+int fscrypt_set_directory_policy(const std::string& dir) {
const std::string prefix = "/data/";
- if (!dir || strncmp(dir, prefix.c_str(), prefix.size())) {
+ if (!android::base::StartsWith(dir, prefix)) {
return 0;
}
// Special-case /data/media/obb per b/64566063
- if (strcmp(dir, "/data/media/obb") == 0) {
+ if (dir == "/data/media/obb") {
// Try to set policy on this directory, but if it is non-empty this may fail.
set_system_de_policy_on(dir);
return 0;
@@ -115,7 +112,7 @@
// To make this less restrictive, consider using a policy file.
// However this is overkill for as long as the policy is simply
// to apply a global policy to all /data folders created via makedir
- if (strchr(dir + prefix.size(), '/')) {
+ if (dir.find_first_of('/', prefix.size()) != std::string::npos) {
return 0;
}
@@ -132,7 +129,7 @@
"apex", "preloads", "app-staging",
"gsi",
};
- for (const auto& d: directories_to_exclude) {
+ for (const auto& d : directories_to_exclude) {
if ((prefix + d) == dir) {
LOG(INFO) << "Not setting policy on " << dir;
return 0;
@@ -144,7 +141,7 @@
}
// Empty these directories if policy setting fails.
std::vector<std::string> wipe_on_failure = {
- "rollback", "rollback-observer", // b/139193659
+ "rollback", "rollback-observer", // b/139193659
};
for (const auto& d : wipe_on_failure) {
if ((prefix + d) == dir) {
@@ -157,7 +154,7 @@
return err;
}
-static int set_system_de_policy_on(char const* dir) {
+static int set_system_de_policy_on(const std::string& dir) {
std::string ref_filename = std::string("/data") + fscrypt_key_ref;
std::string policy;
if (!android::base::ReadFileToString(ref_filename, &policy)) {
@@ -179,14 +176,13 @@
}
LOG(INFO) << "Setting policy on " << dir;
- int result = fscrypt_policy_ensure(dir, policy.c_str(), policy.length(),
- modes[0].c_str(),
- modes.size() >= 2 ?
- modes[1].c_str() : "aes-256-cts");
+ int result =
+ fscrypt_policy_ensure(dir.c_str(), policy.c_str(), policy.length(), modes[0].c_str(),
+ modes.size() >= 2 ? modes[1].c_str() : "aes-256-cts");
if (result) {
- LOG(ERROR) << android::base::StringPrintf(
- "Setting %02x%02x%02x%02x policy on %s failed!",
- policy[0], policy[1], policy[2], policy[3], dir);
+ LOG(ERROR) << android::base::StringPrintf("Setting %02x%02x%02x%02x policy on %s failed!",
+ policy[0], policy[1], policy[2], policy[3],
+ dir.c_str());
return -1;
}
diff --git a/init/fscrypt_init_extensions.h b/init/fscrypt_init_extensions.h
index 2b6c46e..2163ef6 100644
--- a/init/fscrypt_init_extensions.h
+++ b/init/fscrypt_init_extensions.h
@@ -14,20 +14,9 @@
* limitations under the License.
*/
-#ifndef _FSCRYPT_INIT_EXTENSIONS_H_
-#define _FSCRYPT_INIT_EXTENSIONS_H_
+#pragma once
-#include <sys/cdefs.h>
-#include <stdbool.h>
-#include <cutils/multiuser.h>
+#include <string>
-__BEGIN_DECLS
-
-// These functions assume they are being called from init
-// They will not operate properly outside of init
int fscrypt_install_keyring();
-int fscrypt_set_directory_policy(const char* path);
-
-__END_DECLS
-
-#endif // _FSCRYPT_INIT_EXTENSIONS_H_
+int fscrypt_set_directory_policy(const std::string& dir);