我的应用程序有一个特定的功能，只能在根可用的设备上工作。与其让这个特性在使用时失败(然后向用户显示适当的错误消息)，我更希望能够先静默地检查根目录是否可用，如果不可用，则首先隐藏相应的选项。
有办法做到这一点吗?
当前回答
除了@Kevins的回答之外，我最近在使用他的系统时发现，Nexus 7.1对所有三个方法都返回false——没有哪个命令，没有测试键，SuperSU没有安装在/system/app中。
我补充说:
public static boolean checkRootMethod4(Context context) {
return isPackageInstalled("eu.chainfire.supersu", context);
}
private static boolean isPackageInstalled(String packagename, Context context) {
PackageManager pm = context.getPackageManager();
try {
pm.getPackageInfo(packagename, PackageManager.GET_ACTIVITIES);
return true;
} catch (NameNotFoundException e) {
return false;
}
}
这在某些情况下有点不太有用(如果你需要保证root访问)，因为SuperSU完全有可能安装在没有SU访问的设备上。
然而，由于SuperSU可以安装并工作，但不在/system/app目录下，这个额外的情况将会根除(哈哈)这样的情况。
其他回答
你可以使用isAccessGiven()代替isRootAvailable()。直接从RootTools wiki:
if (RootTools.isAccessGiven()) {
// your app has been granted root access
}
RootTools.isAccessGiven()不仅检查设备是否已根，它还检查设备是否已根 也为你的应用程序调用su，请求权限，如果返回true 您的应用程序已成功授予根权限。可以使用这个 作为在你的应用程序中的第一个检查，以确保你将被授予 在需要的时候访问。
参考
除了@Kevins的回答之外，我最近在使用他的系统时发现，Nexus 7.1对所有三个方法都返回false——没有哪个命令，没有测试键，SuperSU没有安装在/system/app中。
我补充说:
public static boolean checkRootMethod4(Context context) {
return isPackageInstalled("eu.chainfire.supersu", context);
}
private static boolean isPackageInstalled(String packagename, Context context) {
PackageManager pm = context.getPackageManager();
try {
pm.getPackageInfo(packagename, PackageManager.GET_ACTIVITIES);
return true;
} catch (NameNotFoundException e) {
return false;
}
}
这在某些情况下有点不太有用(如果你需要保证root访问)，因为SuperSU完全有可能安装在没有SU访问的设备上。
然而，由于SuperSU可以安装并工作，但不在/system/app目录下，这个额外的情况将会根除(哈哈)这样的情况。
Java级别的根检查不是一个安全的解决方案。如果您的应用程序在root设备上运行有安全问题，那么请使用此解决方案。
凯文的答案是有效的，除非手机也有像RootCloak这样的应用程序。这样的应用程序有一个对Java api的句柄，一旦手机是根的，他们模仿这些api来返回手机不是根的。
我已经写了一个原生级别的代码基于凯文的答案，它甚至与RootCloak !此外，它不会导致任何内存泄漏问题。
#include <string.h>
#include <jni.h>
#include <time.h>
#include <sys/stat.h>
#include <stdio.h>
#include "android_log.h"
#include <errno.h>
#include <unistd.h>
#include <sys/system_properties.h>
JNIEXPORT int JNICALL Java_com_test_RootUtils_checkRootAccessMethod1(
JNIEnv* env, jobject thiz) {
//Access function checks whether a particular file can be accessed
int result = access("/system/app/Superuser.apk",F_OK);
ANDROID_LOGV( "File Access Result %d\n", result);
int len;
char build_tags[PROP_VALUE_MAX]; // PROP_VALUE_MAX from <sys/system_properties.h>.
len = __system_property_get(ANDROID_OS_BUILD_TAGS, build_tags); // On return, len will equal (int)strlen(model_id).
if(strcmp(build_tags,"test-keys") == 0){
ANDROID_LOGV( "Device has test keys\n", build_tags);
result = 0;
}
ANDROID_LOGV( "File Access Result %s\n", build_tags);
return result;
}
JNIEXPORT int JNICALL Java_com_test_RootUtils_checkRootAccessMethod2(
JNIEnv* env, jobject thiz) {
//which command is enabled only after Busy box is installed on a rooted device
//Outpput of which command is the path to su file. On a non rooted device , we will get a null/ empty path
//char* cmd = const_cast<char *>"which su";
FILE* pipe = popen("which su", "r");
if (!pipe) return -1;
char buffer[128];
std::string resultCmd = "";
while(!feof(pipe)) {
if(fgets(buffer, 128, pipe) != NULL)
resultCmd += buffer;
}
pclose(pipe);
const char *cstr = resultCmd.c_str();
int result = -1;
if(cstr == NULL || (strlen(cstr) == 0)){
ANDROID_LOGV( "Result of Which command is Null");
}else{
result = 0;
ANDROID_LOGV( "Result of Which command %s\n", cstr);
}
return result;
}
JNIEXPORT int JNICALL Java_com_test_RootUtils_checkRootAccessMethod3(
JNIEnv* env, jobject thiz) {
int len;
char build_tags[PROP_VALUE_MAX]; // PROP_VALUE_MAX from <sys/system_properties.h>.
int result = -1;
len = __system_property_get(ANDROID_OS_BUILD_TAGS, build_tags); // On return, len will equal (int)strlen(model_id).
if(len >0 && strstr(build_tags,"test-keys") != NULL){
ANDROID_LOGV( "Device has test keys\n", build_tags);
result = 0;
}
return result;
}
在Java代码中，需要创建包装器类RootUtils来进行本机调用
public boolean checkRooted() {
if( rootUtils.checkRootAccessMethod3() == 0 || rootUtils.checkRootAccessMethod1() == 0 || rootUtils.checkRootAccessMethod2() == 0 )
return true;
return false;
}
如果你已经在使用Fabric/Firebase Crashlytics，你可以打电话
CommonUtils.isRooted(context)
这是该方法的当前实现:
public static boolean isRooted(Context context) {
boolean isEmulator = isEmulator(context);
String buildTags = Build.TAGS;
if (!isEmulator && buildTags != null && buildTags.contains("test-keys")) {
return true;
} else {
File file = new File("/system/app/Superuser.apk");
if (file.exists()) {
return true;
} else {
file = new File("/system/xbin/su");
return !isEmulator && file.exists();
}
}
}
public static boolean isEmulator(Context context) {
String androidId = Secure.getString(context.getContentResolver(), "android_id");
return "sdk".equals(Build.PRODUCT) || "google_sdk".equals(Build.PRODUCT) || androidId == null;
}
我建议使用本机代码进行根检测。 下面是一个完整的工作示例。
JAVA包装程序:
package com.kozhevin.rootchecks.util;
import android.support.annotation.NonNull;
import com.kozhevin.rootchecks.BuildConfig;
public class MeatGrinder {
private final static String LIB_NAME = "native-lib";
private static boolean isLoaded;
private static boolean isUnderTest = false;
private MeatGrinder() {
}
public boolean isLibraryLoaded() {
if (isLoaded) {
return true;
}
try {
if(isUnderTest) {
throw new UnsatisfiedLinkError("under test");
}
System.loadLibrary(LIB_NAME);
isLoaded = true;
} catch (UnsatisfiedLinkError e) {
if (BuildConfig.DEBUG) {
e.printStackTrace();
}
}
return isLoaded;
}
public native boolean isDetectedDevKeys();
public native boolean isDetectedTestKeys();
public native boolean isNotFoundReleaseKeys();
public native boolean isFoundDangerousProps();
public native boolean isPermissiveSelinux();
public native boolean isSuExists();
public native boolean isAccessedSuperuserApk();
public native boolean isFoundSuBinary();
public native boolean isFoundBusyboxBinary();
public native boolean isFoundXposed();
public native boolean isFoundResetprop();
public native boolean isFoundWrongPathPermission();
public native boolean isFoundHooks();
@NonNull
public static MeatGrinder getInstance() {
return InstanceHolder.INSTANCE;
}
private static class InstanceHolder {
private static final MeatGrinder INSTANCE = new MeatGrinder();
}
}
JNI包装器(native-lib.c):
JNIEXPORT jboolean JNICALL
Java_com_kozhevin_rootchecks_util_MeatGrinder_isDetectedTestKeys(
JNIEnv *env,
jobject this ) {
return (jboolean) isDetectedTestKeys();
}
JNIEXPORT jboolean JNICALL
Java_com_kozhevin_rootchecks_util_MeatGrinder_isDetectedDevKeys(
JNIEnv *env,
jobject this ) {
return (jboolean) isDetectedDevKeys();
}
JNIEXPORT jboolean JNICALL
Java_com_kozhevin_rootchecks_util_MeatGrinder_isNotFoundReleaseKeys(
JNIEnv *env,
jobject this ) {
return (jboolean) isNotFoundReleaseKeys();
}
JNIEXPORT jboolean JNICALL
Java_com_kozhevin_rootchecks_util_MeatGrinder_isFoundDangerousProps(
JNIEnv *env,
jobject this ) {
return (jboolean) isFoundDangerousProps();
}
JNIEXPORT jboolean JNICALL
Java_com_kozhevin_rootchecks_util_MeatGrinder_isPermissiveSelinux(
JNIEnv *env,
jobject this ) {
return (jboolean) isPermissiveSelinux();
}
JNIEXPORT jboolean JNICALL
Java_com_kozhevin_rootchecks_util_MeatGrinder_isSuExists(
JNIEnv *env,
jobject this ) {
return (jboolean) isSuExists();
}
JNIEXPORT jboolean JNICALL
Java_com_kozhevin_rootchecks_util_MeatGrinder_isAccessedSuperuserApk(
JNIEnv *env,
jobject this ) {
return (jboolean) isAccessedSuperuserApk();
}
JNIEXPORT jboolean JNICALL
Java_com_kozhevin_rootchecks_util_MeatGrinder_isFoundSuBinary(
JNIEnv *env,
jobject this ) {
return (jboolean) isFoundSuBinary();
}
JNIEXPORT jboolean JNICALL
Java_com_kozhevin_rootchecks_util_MeatGrinder_isFoundBusyboxBinary(
JNIEnv *env,
jobject this ) {
return (jboolean) isFoundBusyboxBinary();
}
JNIEXPORT jboolean JNICALL
Java_com_kozhevin_rootchecks_util_MeatGrinder_isFoundXposed(
JNIEnv *env,
jobject this ) {
return (jboolean) isFoundXposed();
}
JNIEXPORT jboolean JNICALL
Java_com_kozhevin_rootchecks_util_MeatGrinder_isFoundResetprop(
JNIEnv *env,
jobject this ) {
return (jboolean) isFoundResetprop();
}
JNIEXPORT jboolean JNICALL
Java_com_kozhevin_rootchecks_util_MeatGrinder_isFoundWrongPathPermission(
JNIEnv *env,
jobject this ) {
return (jboolean) isFoundWrongPathPermission();
}
JNIEXPORT jboolean JNICALL
Java_com_kozhevin_rootchecks_util_MeatGrinder_isFoundHooks(
JNIEnv *env,
jobject this ) {
return (jboolean) isFoundHooks();
}
常量:
// Comma-separated tags describing the build, like= "unsigned,debug".
const char *const ANDROID_OS_BUILD_TAGS = "ro.build.tags";
// A string that uniquely identifies this build. 'BRAND/PRODUCT/DEVICE:RELEASE/ID/VERSION.INCREMENTAL:TYPE/TAGS'.
const char *const ANDROID_OS_BUILD_FINGERPRINT = "ro.build.fingerprint";
const char *const ANDROID_OS_SECURE = "ro.secure";
const char *const ANDROID_OS_DEBUGGABLE = "ro.debuggable";
const char *const ANDROID_OS_SYS_INITD = "sys.initd";
const char *const ANDROID_OS_BUILD_SELINUX = "ro.build.selinux";
//see https://android.googlesource.com/platform/system/core/+/master/adb/services.cpp#86
const char *const SERVICE_ADB_ROOT = "service.adb.root";
const char * const MG_SU_PATH[] = {
"/data/local/",
"/data/local/bin/",
"/data/local/xbin/",
"/sbin/",
"/system/bin/",
"/system/bin/.ext/",
"/system/bin/failsafe/",
"/system/sd/xbin/",
"/su/xbin/",
"/su/bin/",
"/magisk/.core/bin/",
"/system/usr/we-need-root/",
"/system/xbin/",
0
};
const char * const MG_EXPOSED_FILES[] = {
"/system/lib/libxposed_art.so",
"/system/lib64/libxposed_art.so",
"/system/xposed.prop",
"/cache/recovery/xposed.zip",
"/system/framework/XposedBridge.jar",
"/system/bin/app_process64_xposed",
"/system/bin/app_process32_xposed",
"/magisk/xposed/system/lib/libsigchain.so",
"/magisk/xposed/system/lib/libart.so",
"/magisk/xposed/system/lib/libart-disassembler.so",
"/magisk/xposed/system/lib/libart-compiler.so",
"/system/bin/app_process32_orig",
"/system/bin/app_process64_orig",
0
};
const char * const MG_READ_ONLY_PATH[] = {
"/system",
"/system/bin",
"/system/sbin",
"/system/xbin",
"/vendor/bin",
"/sbin",
"/etc",
0
};
本地代码的根检测:
struct mntent *getMntent(FILE *fp, struct mntent *e, char *buf, int buf_len) {
while (fgets(buf, buf_len, fp) != NULL) {
// Entries look like "/dev/block/vda /system ext4 ro,seclabel,relatime,data=ordered 0 0".
// That is: mnt_fsname mnt_dir mnt_type mnt_opts mnt_freq mnt_passno.
int fsname0, fsname1, dir0, dir1, type0, type1, opts0, opts1;
if (sscanf(buf, " %n%*s%n %n%*s%n %n%*s%n %n%*s%n %d %d",
&fsname0, &fsname1, &dir0, &dir1, &type0, &type1, &opts0, &opts1,
&e->mnt_freq, &e->mnt_passno) == 2) {
e->mnt_fsname = &buf[fsname0];
buf[fsname1] = '\0';
e->mnt_dir = &buf[dir0];
buf[dir1] = '\0';
e->mnt_type = &buf[type0];
buf[type1] = '\0';
e->mnt_opts = &buf[opts0];
buf[opts1] = '\0';
return e;
}
}
return NULL;
}
bool isPresentMntOpt(const struct mntent *pMnt, const char *pOpt) {
char *token = pMnt->mnt_opts;
const char *end = pMnt->mnt_opts + strlen(pMnt->mnt_opts);
const size_t optLen = strlen(pOpt);
while (token != NULL) {
const char *tokenEnd = token + optLen;
if (tokenEnd > end) break;
if (memcmp(token, pOpt, optLen) == 0 &&
(*tokenEnd == '\0' || *tokenEnd == ',' || *tokenEnd == '=')) {
return true;
}
token = strchr(token, ',');
if (token != NULL) {
token++;
}
}
return false;
}
static char *concat2str(const char *pString1, const char *pString2) {
char *result;
size_t lengthBuffer = 0;
lengthBuffer = strlen(pString1) +
strlen(pString2) + 1;
result = malloc(lengthBuffer);
if (result == NULL) {
GR_LOGW("malloc failed\n");
return NULL;
}
memset(result, 0, lengthBuffer);
strcpy(result, pString1);
strcat(result, pString2);
return result;
}
static bool
isBadPropertyState(const char *key, const char *badValue, bool isObligatoryProperty, bool isExact) {
if (badValue == NULL) {
GR_LOGE("badValue may not be NULL");
return false;
}
if (key == NULL) {
GR_LOGE("key may not be NULL");
return false;
}
char value[PROP_VALUE_MAX + 1];
int length = __system_property_get(key, value);
bool result = false;
/* A length 0 value indicates that the property is not defined */
if (length > 0) {
GR_LOGI("property:[%s]==[%s]", key, value);
if (isExact) {
if (strcmp(value, badValue) == 0) {
GR_LOGW("bad value[%s] equals to [%s] in the property [%s]", value, badValue, key);
result = true;
}
} else {
if (strlen(value) >= strlen(badValue) && strstr(value, badValue) != NULL) {
GR_LOGW("bad value[%s] found in [%s] in the property [%s]", value, badValue, key);
result = true;
}
}
} else {
GR_LOGI("[%s] property not found", key);
if (isObligatoryProperty) {
result = true;
}
}
return result;
}
bool isDetectedTestKeys() {
const char *TEST_KEYS_VALUE = "test-keys";
return isBadPropertyState(ANDROID_OS_BUILD_TAGS, TEST_KEYS_VALUE, true, false);
}
bool isDetectedDevKeys() {
const char *DEV_KEYS_VALUE = "dev-keys";
return isBadPropertyState(ANDROID_OS_BUILD_TAGS, DEV_KEYS_VALUE, true, false);
}
bool isNotFoundReleaseKeys() {
const char *RELEASE_KEYS_VALUE = "release-keys";
return !isBadPropertyState(ANDROID_OS_BUILD_TAGS, RELEASE_KEYS_VALUE, false, true);
}
bool isFoundWrongPathPermission() {
bool result = false;
FILE *file = fopen("/proc/mounts", "r");
char mntent_strings[BUFSIZ];
if (file == NULL) {
GR_LOGE("setmntent");
return result;
}
struct mntent ent = {0};
while (NULL != getMntent(file, &ent, mntent_strings, sizeof(mntent_strings))) {
for (size_t i = 0; MG_READ_ONLY_PATH[i]; i++) {
if (strcmp((&ent)->mnt_dir, MG_READ_ONLY_PATH[i]) == 0 &&
isPresentMntOpt(&ent, "rw")) {
GR_LOGI("%s %s %s %s\n", (&ent)->mnt_fsname, (&ent)->mnt_dir, (&ent)->mnt_opts,
(&ent)->mnt_type);
result = true;
break;
}
}
memset(&ent, 0, sizeof(ent));
}
fclose(file);
return result;
}
bool isFoundDangerousProps() {
const char *BAD_DEBUGGABLE_VALUE = "1";
const char *BAD_SECURE_VALUE = "0";
const char *BAD_SYS_INITD_VALUE = "1";
const char *BAD_SERVICE_ADB_ROOT_VALUE = "1";
bool result = isBadPropertyState(ANDROID_OS_DEBUGGABLE, BAD_DEBUGGABLE_VALUE, true, true) ||
isBadPropertyState(SERVICE_ADB_ROOT, BAD_SERVICE_ADB_ROOT_VALUE, false, true) ||
isBadPropertyState(ANDROID_OS_SECURE, BAD_SECURE_VALUE, true, true) ||
isBadPropertyState(ANDROID_OS_SYS_INITD, BAD_SYS_INITD_VALUE, false, true);
return result;
}
bool isPermissiveSelinux() {
const char *BAD_VALUE = "0";
return isBadPropertyState(ANDROID_OS_BUILD_SELINUX, BAD_VALUE, false, false);
}
bool isSuExists() {
char buf[BUFSIZ];
char *str = NULL;
char *temp = NULL;
size_t size = 1; // start with size of 1 to make room for null terminator
size_t strlength;
FILE *pipe = popen("which su", "r");
if (pipe == NULL) {
GR_LOGI("pipe is null");
return false;
}
while (fgets(buf, sizeof(buf), pipe) != NULL) {
strlength = strlen(buf);
temp = realloc(str, size + strlength); // allocate room for the buf that gets appended
if (temp == NULL) {
// allocation error
GR_LOGE("Error (re)allocating memory");
pclose(pipe);
if (str != NULL) {
free(str);
}
return false;
} else {
str = temp;
}
strcpy(str + size - 1, buf);
size += strlength;
}
pclose(pipe);
GR_LOGW("A size of the result from pipe is [%zu], result:\n [%s] ", size, str);
if (str != NULL) {
free(str);
}
return size > 1 ? true : false;
}
static bool isAccessedFile(const char *path) {
int result = access(path, F_OK);
GR_LOGV("[%s] has been accessed with result: [%d]", path, result);
return result == 0 ? true : false;
}
static bool isFoundBinaryFromArray(const char *const *array, const char *binary) {
for (size_t i = 0; array[i]; ++i) {
char *checkedPath = concat2str(array[i], binary);
if (checkedPath == NULL) { // malloc failed
return false;
}
bool result = isAccessedFile(checkedPath);
free(checkedPath);
if (result) {
return result;
}
}
return false;
}
bool isAccessedSuperuserApk() {
return isAccessedFile("/system/app/Superuser.apk");
}
bool isFoundResetprop() {
return isAccessedFile("/data/magisk/resetprop");
}
bool isFoundSuBinary() {
return isFoundBinaryFromArray(MG_SU_PATH, "su");
}
bool isFoundBusyboxBinary() {
return isFoundBinaryFromArray(MG_SU_PATH, "busybox");
}
bool isFoundXposed() {
for (size_t i = 0; MG_EXPOSED_FILES[i]; ++i) {
bool result = isAccessedFile(MG_EXPOSED_FILES[i]);
if (result) {
return result;
}
}
return false;
}
bool isFoundHooks() {
bool result = false;
pid_t pid = getpid();
char maps_file_name[512];
sprintf(maps_file_name, "/proc/%d/maps", pid);
GR_LOGI("try to open [%s]", maps_file_name);
const size_t line_size = BUFSIZ;
char *line = malloc(line_size);
if (line == NULL) {
return result;
}
FILE *fp = fopen(maps_file_name, "r");
if (fp == NULL) {
free(line);
return result;
}
memset(line, 0, line_size);
const char *substrate = "com.saurik.substrate";
const char *xposed = "XposedBridge.jar";
while (fgets(line, line_size, fp) != NULL) {
const size_t real_line_size = strlen(line);
if ((real_line_size >= strlen(substrate) && strstr(line, substrate) != NULL) ||
(real_line_size >= strlen(xposed) && strstr(line, xposed) != NULL)) {
GR_LOGI("found in [%s]: [%s]", maps_file_name, line);
result = true;
break;
}
}
free(line);
fclose(fp);
return result;
}
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