一、注意事项
1、不能在android2.2及更早的版本使用。
2、显示设置exported属性为false。
3、注意收到数据的真实性。
4、敏感数据可以在同一个应用中发送和接收。
二、原代码示例
1.AndroidManifest.xml
<?xml version="1.0" encoding="utf-8"?>@b@ <manifest xmlns:android="http://schemas.android.com/apk/res/android" package="org.jssec.android.provider.privateprovider">@b@ @b@ <application@b@ android:icon="@drawable/ic_launcher"@b@ android:label="@string/app_name" >@b@ <activity@b@ android:name=".PrivateUserActivity"@b@ android:label="@string/app_name"@b@ android:exported="true" >@b@ <intent-filter>@b@ <action android:name="android.intent.action.MAIN" />@b@ <category android:name="android.intent.category.LAUNCHER" />@b@ </intent-filter>@b@ </activity>@b@ @b@ <!-- *** POINT 2 *** Explicitly set the exported attribute to false. -->@b@ <provider@b@ android:name=".PrivateProvider"@b@ android:authorities="org.jssec.android.provider.privateprovider"@b@ android:exported="false" />@b@ </application>@b@</manifest>
2.PrivateProvider.java
package org.jssec.android.provider.privateprovider;@b@ @b@import android.content.ContentProvider;@b@import android.content.ContentUris;@b@import android.content.ContentValues;@b@import android.content.UriMatcher;@b@import android.database.Cursor;@b@import android.database.MatrixCursor;@b@import android.net.Uri;@b@ @b@public class PrivateProvider extends ContentProvider {@b@ @b@ public static final String AUTHORITY = "org.jssec.android.provider.privateprovider";@b@ public static final String CONTENT_TYPE = "vnd.android.cursor.dir/vnd.org.jssec.contenttype";@b@ public static final String CONTENT_ITEM_TYPE = "vnd.android.cursor.item/vnd.org.jssec.contenttype";@b@ @b@ // Expose the interface that the Content Provider provides.@b@ public interface Download {@b@ public static final String PATH = "downloads";@b@ public static final Uri CONTENT_URI = Uri.parse("content://" + AUTHORITY + "/" + PATH);@b@ }@b@ public interface Address {@b@ public static final String PATH = "addresses";@b@ public static final Uri CONTENT_URI = Uri.parse("content://" + AUTHORITY + "/" + PATH);@b@ }@b@ @b@ // UriMatcher@b@ private static final int DOWNLOADS_CODE = 1;@b@ private static final int DOWNLOADS_ID_CODE = 2;@b@ private static final int ADDRESSES_CODE = 3;@b@ private static final int ADDRESSES_ID_CODE = 4;@b@ private static UriMatcher sUriMatcher;@b@ static {@b@ sUriMatcher = new UriMatcher(UriMatcher.NO_MATCH);@b@ sUriMatcher.addURI(AUTHORITY, Download.PATH, DOWNLOADS_CODE);@b@ sUriMatcher.addURI(AUTHORITY, Download.PATH + "/#", DOWNLOADS_ID_CODE);@b@ sUriMatcher.addURI(AUTHORITY, Address.PATH, ADDRESSES_CODE);@b@ sUriMatcher.addURI(AUTHORITY, Address.PATH + "/#", ADDRESSES_ID_CODE);@b@ }@b@ @b@ // Since this is a sample program,@b@ // query method returns the following fixed result always without using database.@b@ private static MatrixCursor sAddressCursor = new MatrixCursor(new String[] { "_id", "city" });@b@ static {@b@ sAddressCursor.addRow(new String[] { "1", "New York" });@b@ sAddressCursor.addRow(new String[] { "2", "Longon" });@b@ sAddressCursor.addRow(new String[] { "3", "Paris" });@b@ }@b@ private static MatrixCursor sDownloadCursor = new MatrixCursor(new String[] { "_id", "path" });@b@ static {@b@ sDownloadCursor.addRow(new String[] { "1", "/sdcard/downloads/sample.jpg" });@b@ sDownloadCursor.addRow(new String[] { "2", "/sdcard/downloads/sample.txt" }); }@b@ @b@ @Override@b@ public boolean onCreate() {@b@ return true;@b@ }@b@ @Override@b@ public String getType(Uri uri) {@b@ // *** POINT 3 *** Handle the received request data carefully and securely,@b@ // even though the data comes from the same application.@b@ // Here, whether uri is within expectations or not, is verified by UriMatcher#match() and switch case. // Checking for other parameters are omitted here, due to sample.@b@ // Please refer to "3.2 Handle Input Data Carefully and Securely."@b@ // *** POINT 4 *** Sensitive information can be sent since it is sending and receiving all within the same app lication.@b@ // However, the result of getType rarely has the sensitive meaning.@b@ switch (sUriMatcher.match(uri)) {@b@ case DOWNLOADS_CODE:@b@ case ADDRESSES_CODE:@b@ return CONTENT_TYPE;@b@ @b@ case DOWNLOADS_ID_CODE:@b@ case ADDRESSES_ID_CODE:@b@ return CONTENT_ITEM_TYPE;@b@ @b@ default:@b@ throw new IllegalArgumentException("Invalid URI:" + uri);@b@ }@b@ }@b@ @b@ @Override@b@ public Cursor query(Uri uri, String[] projection, String selection,String[] selectionArgs, String sortOrder) {@b@ @b@ // *** POINT 3 *** Handle the received request data carefully and securely,@b@ // even though the data comes from the same application.@b@ // Here, whether uri is within expectations or not, is verified by UriMatcher#match() and switch case. // Checking for other parameters are omitted here, due to sample.@b@ // Please refer to "3.2 Handle Input Data Carefully and Securely."@b@ // *** POINT 4 *** Sensitive information can be sent since it is sending and receiving all within the same app lication.@b@ // It depends on application whether the query result has sensitive meaning or not.@b@ switch (sUriMatcher.match(uri)) {@b@ case DOWNLOADS_CODE:@b@ case DOWNLOADS_ID_CODE:@b@ return sDownloadCursor;@b@ @b@ case ADDRESSES_CODE:@b@ case ADDRESSES_ID_CODE:@b@ return sAddressCursor;@b@ @b@ default:@b@ throw new IllegalArgumentException("Invalid URI:" + uri);@b@ }@b@ }@b@ @b@ @Override@b@ public Uri insert(Uri uri, ContentValues values) {@b@ @b@ // *** POINT 3 *** Handle the received request data carefully and securely,@b@ // even though the data comes from the same application.@b@ // Here, whether uri is within expectations or not, is verified by UriMatcher#match() and switch case. // Checking for other parameters are omitted here, due to sample.@b@ // Please refer to "3.2 Handle Input Data Carefully and Securely."@b@ // *** POINT 4 *** Sensitive information can be sent since it is sending and receiving all within the same app lication.@b@ // It depends on application whether the issued ID has sensitive meaning or not.@b@ switch (sUriMatcher.match(uri)) {@b@ case DOWNLOADS_CODE:@b@ return ContentUris.withAppendedId(Download.CONTENT_URI, 3);@b@ @b@ case ADDRESSES_CODE:@b@ return ContentUris.withAppendedId(Address.CONTENT_URI, 4);@b@ @b@ default:@b@ throw new IllegalArgumentException("Invalid URI:" + uri);@b@ }@b@ }@b@ @b@ @Override@b@ public int update(Uri uri, ContentValues values, String selection,String[] selectionArgs) {@b@ @b@ // *** POINT 3 *** Handle the received request data carefully and securely,@b@ // even though the data comes from the same application.@b@ // Here, whether uri is within expectations or not, is verified by UriMatcher#match() and switch case. // Checking for other parameters are omitted here, due to sample.@b@ // Please refer to "3.2 Handle Input Data Carefully and Securely."@b@ // *** POINT 4 *** Sensitive information can be sent since it is sending and receiving all within the same app lication.@b@ // It depends on application whether the number of updated records has sensitive meaning or not.@b@ switch (sUriMatcher.match(uri)) {@b@ case DOWNLOADS_CODE:@b@ return 5; // Return number of updated records@b@ @b@ case DOWNLOADS_ID_CODE:@b@ return 1;@b@ @b@ case ADDRESSES_CODE:@b@ return 15;@b@ @b@ case ADDRESSES_ID_CODE:@b@ return 1;@b@ @b@ default:@b@ throw new IllegalArgumentException("Invalid URI:" + uri);@b@ }@b@ }@b@ @b@ @Override@b@ public int delete(Uri uri, String selection, String[] selectionArgs) {@b@ @b@ // *** POINT 3 *** Handle the received request data carefully and securely,@b@ // even though the data comes from the same application.@b@ // Here, whether uri is within expectations or not, is verified by UriMatcher#match() and switch case. // Checking for other parameters are omitted here, due to sample.@b@ // Please refer to "3.2 Handle Input Data Carefully and Securely."@b@ // *** POINT 4 *** Sensitive information can be sent since it is sending and receiving all within the same app lication.@b@ // It depends on application whether the number of deleted records has sensitive meaning or not.@b@ switch (sUriMatcher.match(uri)) {@b@ case DOWNLOADS_CODE:@b@ return 10; // Return number of deleted records@b@ @b@ case DOWNLOADS_ID_CODE:@b@ return 1;@b@ @b@ case ADDRESSES_CODE:@b@ return 20;@b@ @b@ case ADDRESSES_ID_CODE:@b@ return 1;@b@ @b@ default:@b@ throw new IllegalArgumentException("Invalid URI:" + uri);@b@ }@b@ }@b@}
3.安全使用PrivateUserActivity.java - 敏感数据可以在同一个应用内发送 、处理收到的数据,确认其正确性。
package org.jssec.android.provider.privateprovider;@b@ @b@import android.app.Activity;@b@import android.database.Cursor;@b@import android.net.Uri;@b@import android.os.Bundle;@b@import android.view.View;@b@import android.widget.TextView;@b@ @b@public class PrivateUserActivity extends Activity {@b@ @b@ public void onQueryClick(View view) {@b@ @b@ logLine("[Query]");@b@ @b@ Cursor cursor = null;@b@ try {@b@ @b@ // *** POINT 5 *** Sensitive information can be sent since the destination provider is in the same applica@b@ cursor = getContentResolver().query( PrivateProvider.Download.CONTENT_URI, null, null, null, null);@b@ @b@ // *** POINT 6 *** Handle received result data carefully and securely,@b@ // even though the data comes from the same application.@b@ // Omitted, since this is a sample. Please refer to "3.2 Handling Input Data Carefully and Securely."@b@ if (cursor == null) {@b@ logLine(" null cursor");@b@ } else {@b@ boolean moved = cursor.moveToFirst();@b@ while (moved) {@b@ logLine(String.format(" %d, %s", cursor.getInt(0), cursor.getString(1)));@b@ moved = cursor.moveToNext();@b@ }@b@ }@b@ }@b@ finally {@b@ if (cursor != null) cursor.close();@b@ }@b@ }@b@ @b@ public void onInsertClick(View view) {@b@ @b@ logLine("[Insert]");@b@ @b@ // *** POINT 5 *** Sensitive information can be sent since the destination provider is in the same application@b@ @b@ Uri uri = getContentResolver().insert(PrivateProvider.Download.CONTENT_URI, null);@b@ @b@ // *** POINT 6 *** Handle received result data carefully and securely,@b@ // even though the data comes from the same application.@b@ // Omitted, since this is a sample. Please refer to "3.2 Handling Input Data Carefully and Securely."@b@ logLine(" uri:" + uri);@b@ }@b@ @b@ public void onUpdateClick(View view) {@b@ @b@ logLine("[Update]");@b@ @b@ // *** POINT 5 *** Sensitive information can be sent since the destination provider is in the same application int count = getContentResolver().update(PrivateProvider.Download.CONTENT_URI, null, null, null);@b@ // *** POINT 6 *** Handle received result data carefully and securely,@b@ // even though the data comes from the same application.@b@ // Omitted, since this is a sample. Please refer to "3.2 Handling Input Data Carefully and Securely." logLine(String.format(" %s records updated", count));@b@ @b@ public void onDeleteClick(View view) {@b@ @b@ logLine("[Delete]");@b@ // *** POINT 5 *** Sensitive information can be sent since the destination provider is in the same application@b@ @b@ int count = getContentResolver().delete( PrivateProvider.Download.CONTENT_URI, null, null);@b@ @b@ // *** POINT 6 *** Handle received result data carefully and securely,@b@ // even though the data comes from the same application.@b@ // Omitted, since this is a sample. Please refer to "3.2 Handling Input Data Carefully and Securely."@b@ logLine(String.format(" %s records deleted", count));@b@ }@b@ @b@ private TextView mLogView;@b@ @b@ @Override@b@ public void onCreate(Bundle savedInstanceState) {@b@ super.onCreate(savedInstanceState);@b@ setContentView(R.layout.main);@b@ mLogView = (TextView)findViewById(R.id.logview);@b@ }@b@ @b@ private void logLine(String line) {@b@ mLogView.append(line);@b@ mLogView.append("¥n");@b@ }@b@}
三、安全代码示例
1、敏感数据可以在同一个应用内发送。@b@2、处理收到的数据,确认其正确性。
PrivateUserActivity.java@b@ @b@package org.jssec.android.provider.privateprovider;@b@ @b@import android.app.Activity;@b@import android.database.Cursor;@b@import android.net.Uri;@b@import android.os.Bundle;@b@import android.view.View;@b@import android.widget.TextView;@b@ @b@public class PrivateUserActivity extends Activity {@b@ @b@ public void onQueryClick(View view) {@b@ @b@ logLine("[Query]");@b@ @b@ Cursor cursor = null;@b@ try {@b@ @b@ // *** POINT 5 *** Sensitive information can be sent since the destination provider is in the same applica@b@ cursor = getContentResolver().query( PrivateProvider.Download.CONTENT_URI, null, null, null, null);@b@ @b@ // *** POINT 6 *** Handle received result data carefully and securely,@b@ // even though the data comes from the same application.@b@ // Omitted, since this is a sample. Please refer to "3.2 Handling Input Data Carefully and Securely."@b@ if (cursor == null) {@b@ logLine(" null cursor");@b@ } else {@b@ boolean moved = cursor.moveToFirst();@b@ while (moved) {@b@ logLine(String.format(" %d, %s", cursor.getInt(0), cursor.getString(1)));@b@ moved = cursor.moveToNext();@b@ }@b@ }@b@ }@b@ finally {@b@ if (cursor != null) cursor.close();@b@ }@b@ }@b@ @b@ public void onInsertClick(View view) {@b@ @b@ logLine("[Insert]");@b@ @b@ // *** POINT 5 *** Sensitive information can be sent since the destination provider is in the same application@b@ @b@ Uri uri = getContentResolver().insert(PrivateProvider.Download.CONTENT_URI, null);@b@ @b@ // *** POINT 6 *** Handle received result data carefully and securely,@b@ // even though the data comes from the same application.@b@ // Omitted, since this is a sample. Please refer to "3.2 Handling Input Data Carefully and Securely."@b@ logLine(" uri:" + uri);@b@ }@b@ @b@ public void onUpdateClick(View view) {@b@ @b@ logLine("[Update]");@b@ @b@ // *** POINT 5 *** Sensitive information can be sent since the destination provider is in the same application int count = getContentResolver().update(PrivateProvider.Download.CONTENT_URI, null, null, null);@b@ // *** POINT 6 *** Handle received result data carefully and securely,@b@ // even though the data comes from the same application.@b@ // Omitted, since this is a sample. Please refer to "3.2 Handling Input Data Carefully and Securely." logLine(String.format(" %s records updated", count));@b@ @b@ public void onDeleteClick(View view) {@b@ @b@ logLine("[Delete]");@b@ // *** POINT 5 *** Sensitive information can be sent since the destination provider is in the same application@b@ @b@ int count = getContentResolver().delete( PrivateProvider.Download.CONTENT_URI, null, null);@b@ @b@ // *** POINT 6 *** Handle received result data carefully and securely,@b@ // even though the data comes from the same application.@b@ // Omitted, since this is a sample. Please refer to "3.2 Handling Input Data Carefully and Securely."@b@ logLine(String.format(" %s records deleted", count));@b@ }@b@ @b@ private TextView mLogView;@b@ @b@ @Override@b@ public void onCreate(Bundle savedInstanceState) {@b@ super.onCreate(savedInstanceState);@b@ setContentView(R.layout.main);@b@ mLogView = (TextView)findViewById(R.id.logview);@b@ }@b@ @b@ private void logLine(String line) {@b@ mLogView.append(line);@b@ mLogView.append("¥n");@b@ }@b@}