upload android base code part6

android/system/keymaster/keymaster_configuration.cpp

@@ -0,0 +1,137 @@
+/*
+ * Copyright (C) 2016 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.
+ */
+
+#include <keymaster/keymaster_configuration.h>
+
+#include <regex>
+#include <string>
+
+#include <regex.h>
+
+#define LOG_TAG "keymaster"
+#include <cutils/log.h>
+
+#ifndef KEYMASTER_UNIT_TEST_BUILD
+#include <cutils/properties.h>
+#else
+#define PROPERTY_VALUE_MAX 80 /* Value doesn't matter */
+void property_get(const char* /* prop_name */, char* /* prop */, const char* /* default */) {}
+#endif
+
+#include <keymaster/authorization_set.h>
+
+namespace keymaster {
+
+namespace {
+
+constexpr char kPlatformVersionProp[] = "ro.build.version.release";
+constexpr char kPlatformVersionRegex[] = "^([0-9]{1,2})(\\.([0-9]{1,2}))?(\\.([0-9]{1,2}))?";
+constexpr size_t kMajorVersionMatch = 1;
+constexpr size_t kMinorVersionMatch = 3;
+constexpr size_t kSubminorVersionMatch = 5;
+constexpr size_t kPlatformVersionMatchCount = kSubminorVersionMatch + 1;
+
+constexpr char kPlatformPatchlevelProp[] = "ro.build.version.security_patch";
+constexpr char kPlatformPatchlevelRegex[] = "^([0-9]{4})-([0-9]{2})-[0-9]{2}$";
+constexpr size_t kYearMatch = 1;
+constexpr size_t kMonthMatch = 2;
+constexpr size_t kPlatformPatchlevelMatchCount = kMonthMatch + 1;
+
+uint32_t match_to_uint32(const char* expression, const regmatch_t& match) {
+    if (match.rm_so == -1)
+        return 0;
+
+    size_t len = match.rm_eo - match.rm_so;
+    std::string s(expression + match.rm_so, len);
+    return std::stoul(s);
+}
+
+}  // anonymous namespace
+
+keymaster_error_t ConfigureDevice(keymaster2_device_t* dev, uint32_t os_version,
+                                  uint32_t os_patchlevel) {
+    AuthorizationSet config_params(AuthorizationSetBuilder()
+                                       .Authorization(keymaster::TAG_OS_VERSION, os_version)
+                                       .Authorization(keymaster::TAG_OS_PATCHLEVEL, os_patchlevel));
+    return dev->configure(dev, &config_params);
+}
+
+keymaster_error_t ConfigureDevice(keymaster2_device_t* dev) {
+    return ConfigureDevice(dev, GetOsVersion(), GetOsPatchlevel());
+}
+
+uint32_t GetOsVersion(const char* version_str) {
+    regex_t regex;
+    if (regcomp(&regex, kPlatformVersionRegex, REG_EXTENDED)) {
+        ALOGE("Failed to compile version regex! (%s)", kPlatformVersionRegex);
+        return 0;
+    }
+
+    regmatch_t matches[kPlatformVersionMatchCount];
+    int not_match =
+        regexec(&regex, version_str, kPlatformVersionMatchCount, matches, 0 /* flags */);
+    regfree(&regex);
+    if (not_match) {
+        ALOGI("Platform version string does not match expected format.  Using version 0.");
+        return 0;
+    }
+
+    uint32_t major = match_to_uint32(version_str, matches[kMajorVersionMatch]);
+    uint32_t minor = match_to_uint32(version_str, matches[kMinorVersionMatch]);
+    uint32_t subminor = match_to_uint32(version_str, matches[kSubminorVersionMatch]);
+
+    return (major * 100 + minor) * 100 + subminor;
+}
+
+uint32_t GetOsVersion() {
+    char version_str[PROPERTY_VALUE_MAX];
+    property_get(kPlatformVersionProp, version_str, "" /* default */);
+    return GetOsVersion(version_str);
+}
+
+uint32_t GetOsPatchlevel(const char* patchlevel_str) {
+    regex_t regex;
+    if (regcomp(&regex, kPlatformPatchlevelRegex, REG_EXTENDED) != 0) {
+        ALOGE("Failed to compile platform patchlevel regex! (%s)", kPlatformPatchlevelRegex);
+        return 0;
+    }
+
+    regmatch_t matches[kPlatformPatchlevelMatchCount];
+    int not_match =
+        regexec(&regex, patchlevel_str, kPlatformPatchlevelMatchCount, matches, 0 /* flags */);
+    regfree(&regex);
+    if (not_match) {
+        ALOGI("Platform patchlevel string does not match expected format.  Using patchlevel 0");
+        return 0;
+    }
+
+    uint32_t year = match_to_uint32(patchlevel_str, matches[kYearMatch]);
+    uint32_t month = match_to_uint32(patchlevel_str, matches[kMonthMatch]);
+
+    if (month < 1 || month > 12) {
+        ALOGE("Invalid patch month %d", month);
+        return 0;
+    }
+    return year * 100 + month;
+}
+
+uint32_t GetOsPatchlevel() {
+    char patchlevel_str[PROPERTY_VALUE_MAX];
+    property_get(kPlatformPatchlevelProp, patchlevel_str, "" /* default */);
+    return GetOsPatchlevel(patchlevel_str);
+}
+
+}  // namespace keymaster