| /* |
| * Copyright (C) 2020 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 "keymint_utils.h" |
| |
| #include <regex.h> |
| |
| #include <android-base/properties.h> |
| #include <android-base/parseint.h> |
| namespace keymint::javacard { |
| |
| 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 kVendorPatchlevelProp[] = "ro.vendor.build.security_patch"; |
| constexpr char kPatchlevelRegex[] = "^([0-9]{4})-([0-9]{2})-([0-9]{2})$"; |
| constexpr size_t kYearMatch = 1; |
| constexpr size_t kMonthMatch = 2; |
| constexpr size_t kDayMatch = 3; |
| constexpr size_t kPatchlevelMatchCount = kDayMatch + 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); |
| uint32_t val = 0; |
| android::base::ParseUint(s, &val); |
| return val; |
| } |
| |
| std::string wait_and_get_property(const char* prop) { |
| std::string prop_value; |
| while (!::android::base::WaitForPropertyCreation(prop)); |
| |
| prop_value = ::android::base::GetProperty(prop, "" /* default */); |
| return prop_value; |
| } |
| |
| uint32_t getOsVersion(const char* version_str) { |
| regex_t regex; |
| if (regcomp(®ex, kPlatformVersionRegex, REG_EXTENDED)) { |
| return 0; |
| } |
| |
| regmatch_t matches[kPlatformVersionMatchCount]; |
| int not_match = |
| regexec(®ex, version_str, kPlatformVersionMatchCount, matches, 0 /* flags */); |
| regfree(®ex); |
| if (not_match) { |
| 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; |
| } |
| |
| enum class PatchlevelOutput { kYearMonthDay, kYearMonth }; |
| |
| uint32_t getPatchlevel(const char* patchlevel_str, PatchlevelOutput detail) { |
| regex_t regex; |
| if (regcomp(®ex, kPatchlevelRegex, REG_EXTENDED) != 0) { |
| return 0; |
| } |
| |
| regmatch_t matches[kPatchlevelMatchCount]; |
| int not_match = regexec(®ex, patchlevel_str, kPatchlevelMatchCount, matches, 0 /* flags */); |
| regfree(®ex); |
| if (not_match) { |
| 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) { |
| return 0; |
| } |
| |
| switch (detail) { |
| case PatchlevelOutput::kYearMonthDay: { |
| uint32_t day = match_to_uint32(patchlevel_str, matches[kDayMatch]); |
| if (day < 1 || day > 31) { |
| return 0; |
| } |
| return year * 10000 + month * 100 + day; |
| } |
| case PatchlevelOutput::kYearMonth: |
| return year * 100 + month; |
| } |
| } |
| |
| } // anonymous namespace |
| |
| uint32_t getOsVersion() { |
| std::string version = wait_and_get_property(kPlatformVersionProp); |
| return getOsVersion(version.c_str()); |
| } |
| |
| uint32_t getOsPatchlevel() { |
| std::string patchlevel = wait_and_get_property(kPlatformPatchlevelProp); |
| return getPatchlevel(patchlevel.c_str(), PatchlevelOutput::kYearMonth); |
| } |
| |
| uint32_t getVendorPatchlevel() { |
| std::string patchlevel = wait_and_get_property(kVendorPatchlevelProp); |
| return getPatchlevel(patchlevel.c_str(), PatchlevelOutput::kYearMonthDay); |
| } |
| |
| } // namespace keymint::javacard |