Merge the 2019-08-01 SPL branch from AOSP-Partner
* aosp-partner/security-aosp-nyc-mr2-release:
Check access to user and password fields in APN db
Change-Id: Id1a6705fa2f6900e1e68c20a8ff7d48798e2c3b7
diff --git a/src/com/android/providers/telephony/SqlTokenFinder.java b/src/com/android/providers/telephony/SqlTokenFinder.java
new file mode 100644
index 0000000..9be49fe
--- /dev/null
+++ b/src/com/android/providers/telephony/SqlTokenFinder.java
@@ -0,0 +1,170 @@
+/*
+ * 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
+ */
+package com.android.providers.telephony;
+
+import android.annotation.Nullable;
+
+import java.util.function.Consumer;
+
+/**
+ * Simple SQL parser to check statements for usage of prohibited/sensitive fields. Mostly copied
+ * from
+ * packages/providers/ContactsProvider/src/com/android/providers/contacts/sqlite/SqlChecker.java
+ */
+public class SqlTokenFinder{
+ private static boolean isAlpha(char ch) {
+ return ('a' <= ch && ch <= 'z') || ('A' <= ch && ch <= 'Z') || (ch == '_');
+ }
+
+ private static boolean isNum(char ch) {
+ return ('0' <= ch && ch <= '9');
+ }
+
+ private static boolean isAlNum(char ch) {
+ return isAlpha(ch) || isNum(ch);
+ }
+
+ private static boolean isAnyOf(char ch, String set) {
+ return set.indexOf(ch) >= 0;
+ }
+
+ private static char peek(String s, int index) {
+ return index < s.length() ? s.charAt(index) : '\0';
+ }
+
+ /**
+ * SQL Tokenizer specialized to extract tokens from SQL (snippets).
+ *
+ * Based on sqlite3GetToken() in tokenzie.c in SQLite.
+ *
+ * Source for v3.8.6 (which android uses): http://www.sqlite.org/src/artifact/ae45399d6252b4d7
+ * (Latest source as of now: http://www.sqlite.org/src/artifact/78c8085bc7af1922)
+ *
+ * Also draft spec: http://www.sqlite.org/draft/tokenreq.html
+ */
+ public static void findTokens(@Nullable String sql, Consumer<String> checker) {
+ if (sql == null) {
+ return;
+ }
+ int pos = 0;
+ final int len = sql.length();
+ while (pos < len) {
+ final char ch = peek(sql, pos);
+
+ // Regular token.
+ if (isAlpha(ch)) {
+ final int start = pos;
+ pos++;
+ while (isAlNum(peek(sql, pos))) {
+ pos++;
+ }
+ final int end = pos;
+
+ final String token = sql.substring(start, end);
+ checker.accept(token);
+
+ continue;
+ }
+
+ // Handle quoted tokens
+ if (isAnyOf(ch, "'\"`")) {
+ final int quoteStart = pos;
+ pos++;
+
+ for (;;) {
+ pos = sql.indexOf(ch, pos);
+ if (pos < 0) {
+ throw new IllegalArgumentException("Unterminated quote in" + sql);
+ }
+ if (peek(sql, pos + 1) != ch) {
+ break;
+ }
+ // Quoted quote char -- e.g. "abc""def" is a single string.
+ pos += 2;
+ }
+ final int quoteEnd = pos;
+ pos++;
+
+ if (ch != '\'') {
+ // Extract the token
+ final String tokenUnquoted = sql.substring(quoteStart + 1, quoteEnd);
+
+ final String token;
+
+ // Unquote if needed. i.e. "aa""bb" -> aa"bb
+ if (tokenUnquoted.indexOf(ch) >= 0) {
+ token = tokenUnquoted.replaceAll(
+ String.valueOf(ch) + ch, String.valueOf(ch));
+ } else {
+ token = tokenUnquoted;
+ }
+ checker.accept(token);
+ }
+ continue;
+ }
+ // Handle tokens enclosed in [...]
+ if (ch == '[') {
+ final int quoteStart = pos;
+ pos++;
+
+ pos = sql.indexOf(']', pos);
+ if (pos < 0) {
+ throw new IllegalArgumentException("Unterminated quote in" + sql);
+ }
+ final int quoteEnd = pos;
+ pos++;
+
+ final String token = sql.substring(quoteStart + 1, quoteEnd);
+
+ checker.accept(token);
+ continue;
+ }
+
+ // Detect comments.
+ if (ch == '-' && peek(sql, pos + 1) == '-') {
+ pos += 2;
+ pos = sql.indexOf('\n', pos);
+ if (pos < 0) {
+ // We disallow strings ending in an inline comment.
+ throw new IllegalArgumentException("Unterminated comment in" + sql);
+ }
+ pos++;
+
+ continue;
+ }
+ if (ch == '/' && peek(sql, pos + 1) == '*') {
+ pos += 2;
+ pos = sql.indexOf("*/", pos);
+ if (pos < 0) {
+ throw new IllegalArgumentException("Unterminated comment in" + sql);
+ }
+ pos += 2;
+
+ continue;
+ }
+
+ // Semicolon is never allowed.
+ if (ch == ';') {
+ throw new IllegalArgumentException("Semicolon is not allowed in " + sql);
+ }
+
+ // For this purpose, we can simply ignore other characters.
+ // (Note it doesn't handle the X'' literal properly and reports this X as a token,
+ // but that should be fine...)
+ pos++;
+ }
+ }
+}
diff --git a/src/com/android/providers/telephony/TelephonyProvider.java b/src/com/android/providers/telephony/TelephonyProvider.java
index 55da5bc..c4dfaa6 100644
--- a/src/com/android/providers/telephony/TelephonyProvider.java
+++ b/src/com/android/providers/telephony/TelephonyProvider.java
@@ -43,6 +43,7 @@
import android.telephony.SubscriptionManager;
import android.telephony.TelephonyManager;
import android.text.TextUtils;
+import android.util.EventLog;
import android.util.Log;
import android.util.Xml;
@@ -59,6 +60,7 @@
import java.util.Arrays;
import java.util.List;
import java.util.Map;
+import java.util.function.Consumer;
import static android.provider.Telephony.Carriers.*;
@@ -1725,6 +1727,23 @@
}
if (match != URL_SIMINFO) {
+ // Determine if we need to do a check for fields in the selection
+ boolean selectionContainsSensitiveFields;
+ try {
+ selectionContainsSensitiveFields = containsSensitiveFields(selection);
+ } catch (Exception e) {
+ // Malformed sql, check permission anyway.
+ selectionContainsSensitiveFields = true;
+ }
+
+ if (selectionContainsSensitiveFields) {
+ try {
+ checkPermission();
+ } catch (SecurityException e) {
+ EventLog.writeEvent(0x534e4554, "124107808", Binder.getCallingUid());
+ throw e;
+ }
+ }
if (projectionIn != null) {
for (String column : projectionIn) {
if (TYPE.equals(column) ||
@@ -1769,6 +1788,21 @@
return ret;
}
+ private boolean containsSensitiveFields(String sqlStatement) {
+ try {
+ SqlTokenFinder.findTokens(sqlStatement, s -> {
+ switch (s) {
+ case USER:
+ case PASSWORD:
+ throw new SecurityException();
+ }
+ });
+ } catch (SecurityException e) {
+ return true;
+ }
+ return false;
+ }
+
@Override
public String getType(Uri url)
{