diff options
Diffstat (limited to 'install')
| -rw-r--r-- | install/Android.bp | 78 | ||||
| -rw-r--r-- | install/adb_install.cpp | 128 | ||||
| -rw-r--r-- | install/asn1_decoder.cpp | 156 | ||||
| -rw-r--r-- | install/fuse_sdcard_install.cpp | 206 | ||||
| -rw-r--r-- | install/include/install/adb_install.h | 21 | ||||
| -rw-r--r-- | install/include/install/fuse_sdcard_install.h | 22 | ||||
| -rw-r--r-- | install/include/install/install.h | 69 | ||||
| -rw-r--r-- | install/include/install/package.h | 53 | ||||
| -rw-r--r-- | install/include/install/verifier.h | 101 | ||||
| -rw-r--r-- | install/include/private/asn1_decoder.h | 56 | ||||
| -rw-r--r-- | install/include/private/setup_commands.h | 39 | ||||
| -rw-r--r-- | install/install.cpp | 730 | ||||
| -rw-r--r-- | install/package.cpp | 262 | ||||
| -rw-r--r-- | install/verifier.cpp | 468 |
14 files changed, 2389 insertions, 0 deletions
diff --git a/install/Android.bp b/install/Android.bp new file mode 100644 index 000000000..aa47990ae --- /dev/null +++ b/install/Android.bp @@ -0,0 +1,78 @@ +// 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. + +cc_defaults { + name: "libinstall_defaults", + + defaults: [ + "recovery_defaults", + ], + + shared_libs: [ + "libbase", + "libbootloader_message", + "libcrypto", + "libext4_utils", + "libfs_mgr", + "libfusesideload", + "libhidl-gen-utils", + "libhidlbase", + "libhidltransport", + "liblog", + "libselinux", + "libtinyxml2", + "libutils", + "libz", + "libziparchive", + ], + + static_libs: [ + "libotautil", + + // external dependencies + "libvintf_recovery", + "libvintf", + "libfstab", + ], +} + +cc_library { + name: "libinstall", + recovery_available: true, + + defaults: [ + "libinstall_defaults", + ], + + srcs: [ + "adb_install.cpp", + "asn1_decoder.cpp", + "fuse_sdcard_install.cpp", + "install.cpp", + "package.cpp", + "verifier.cpp", + ], + + shared_libs: [ + "librecovery_ui", + ], + + export_include_dirs: [ + "include", + ], + + export_shared_lib_headers: [ + "librecovery_ui", + ], +} diff --git a/install/adb_install.cpp b/install/adb_install.cpp new file mode 100644 index 000000000..5296ff608 --- /dev/null +++ b/install/adb_install.cpp @@ -0,0 +1,128 @@ +/* + * Copyright (C) 2012 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 "install/adb_install.h" + +#include <errno.h> +#include <fcntl.h> +#include <signal.h> +#include <stdlib.h> +#include <string.h> +#include <sys/stat.h> +#include <sys/types.h> +#include <sys/wait.h> +#include <unistd.h> + +#include <android-base/logging.h> +#include <android-base/properties.h> + +#include "fuse_sideload.h" +#include "install/install.h" +#include "recovery_ui/ui.h" + +static bool SetUsbConfig(const std::string& state) { + android::base::SetProperty("sys.usb.config", state); + return android::base::WaitForProperty("sys.usb.state", state); +} + +int apply_from_adb(bool* wipe_cache, RecoveryUI* ui) { + // Save the usb state to restore after the sideload operation. + std::string usb_state = android::base::GetProperty("sys.usb.state", "none"); + // Clean up state and stop adbd. + if (usb_state != "none" && !SetUsbConfig("none")) { + LOG(ERROR) << "Failed to clear USB config"; + return INSTALL_ERROR; + } + + ui->Print( + "\n\nNow send the package you want to apply\n" + "to the device with \"adb sideload <filename>\"...\n"); + + pid_t child; + if ((child = fork()) == 0) { + execl("/system/bin/recovery", "recovery", "--adbd", nullptr); + _exit(EXIT_FAILURE); + } + + if (!SetUsbConfig("sideload")) { + LOG(ERROR) << "Failed to set usb config to sideload"; + return INSTALL_ERROR; + } + + // How long (in seconds) we wait for the host to start sending us a package, before timing out. + static constexpr int ADB_INSTALL_TIMEOUT = 300; + + // FUSE_SIDELOAD_HOST_PATHNAME will start to exist once the host connects and starts serving a + // package. Poll for its appearance. (Note that inotify doesn't work with FUSE.) + int result = INSTALL_ERROR; + int status; + bool waited = false; + for (int i = 0; i < ADB_INSTALL_TIMEOUT; ++i) { + if (waitpid(child, &status, WNOHANG) != 0) { + result = INSTALL_ERROR; + waited = true; + break; + } + + struct stat st; + if (stat(FUSE_SIDELOAD_HOST_PATHNAME, &st) != 0) { + if (errno == ENOENT && i < ADB_INSTALL_TIMEOUT - 1) { + sleep(1); + continue; + } else { + ui->Print("\nTimed out waiting for package.\n\n"); + result = INSTALL_ERROR; + kill(child, SIGKILL); + break; + } + } + result = install_package(FUSE_SIDELOAD_HOST_PATHNAME, wipe_cache, false, 0, ui); + break; + } + + if (!waited) { + // Calling stat() on this magic filename signals the minadbd subprocess to shut down. + struct stat st; + stat(FUSE_SIDELOAD_HOST_EXIT_PATHNAME, &st); + + // TODO: there should be a way to cancel waiting for a package (by pushing some button combo on + // the device). For now you just have to 'adb sideload' a file that's not a valid package, like + // "/dev/null". + waitpid(child, &status, 0); + } + + if (!WIFEXITED(status) || WEXITSTATUS(status) != 0) { + if (WEXITSTATUS(status) == 3) { + ui->Print("\nYou need adb 1.0.32 or newer to sideload\nto this device.\n\n"); + } else if (!WIFSIGNALED(status)) { + ui->Print("\n(adbd status %d)\n", WEXITSTATUS(status)); + } + } + + // Clean up before switching to the older state, for example setting the state + // to none sets sys/class/android_usb/android0/enable to 0. + if (!SetUsbConfig("none")) { + LOG(ERROR) << "Failed to clear USB config"; + } + + if (usb_state != "none") { + if (!SetUsbConfig(usb_state)) { + LOG(ERROR) << "Failed to set USB config to " << usb_state; + } + } + + return result; +} diff --git a/install/asn1_decoder.cpp b/install/asn1_decoder.cpp new file mode 100644 index 000000000..2d81a6e13 --- /dev/null +++ b/install/asn1_decoder.cpp @@ -0,0 +1,156 @@ +/* + * Copyright (C) 2013 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 "private/asn1_decoder.h" + +int asn1_context::peek_byte() const { + if (length_ == 0) { + return -1; + } + return *p_; +} + +int asn1_context::get_byte() { + if (length_ == 0) { + return -1; + } + + int byte = *p_; + p_++; + length_--; + return byte; +} + +bool asn1_context::skip_bytes(size_t num_skip) { + if (length_ < num_skip) { + return false; + } + p_ += num_skip; + length_ -= num_skip; + return true; +} + +bool asn1_context::decode_length(size_t* out_len) { + int num_octets = get_byte(); + if (num_octets == -1) { + return false; + } + if ((num_octets & 0x80) == 0x00) { + *out_len = num_octets; + return true; + } + num_octets &= kMaskTag; + if (static_cast<size_t>(num_octets) >= sizeof(size_t)) { + return false; + } + size_t length = 0; + for (int i = 0; i < num_octets; ++i) { + int byte = get_byte(); + if (byte == -1) { + return false; + } + length <<= 8; + length += byte; + } + *out_len = length; + return true; +} + +/** + * Returns the constructed type and advances the pointer. E.g. A0 -> 0 + */ +asn1_context* asn1_context::asn1_constructed_get() { + int type = get_byte(); + if (type == -1 || (type & kMaskConstructed) != kTagConstructed) { + return nullptr; + } + size_t length; + if (!decode_length(&length) || length > length_) { + return nullptr; + } + asn1_context* app_ctx = new asn1_context(p_, length); + app_ctx->app_type_ = type & kMaskAppType; + return app_ctx; +} + +bool asn1_context::asn1_constructed_skip_all() { + int byte = peek_byte(); + while (byte != -1 && (byte & kMaskConstructed) == kTagConstructed) { + skip_bytes(1); + size_t length; + if (!decode_length(&length) || !skip_bytes(length)) { + return false; + } + byte = peek_byte(); + } + return byte != -1; +} + +int asn1_context::asn1_constructed_type() const { + return app_type_; +} + +asn1_context* asn1_context::asn1_sequence_get() { + if ((get_byte() & kMaskTag) != kTagSequence) { + return nullptr; + } + size_t length; + if (!decode_length(&length) || length > length_) { + return nullptr; + } + return new asn1_context(p_, length); +} + +asn1_context* asn1_context::asn1_set_get() { + if ((get_byte() & kMaskTag) != kTagSet) { + return nullptr; + } + size_t length; + if (!decode_length(&length) || length > length_) { + return nullptr; + } + return new asn1_context(p_, length); +} + +bool asn1_context::asn1_sequence_next() { + size_t length; + if (get_byte() == -1 || !decode_length(&length) || !skip_bytes(length)) { + return false; + } + return true; +} + +bool asn1_context::asn1_oid_get(const uint8_t** oid, size_t* length) { + if (get_byte() != kTagOid) { + return false; + } + if (!decode_length(length) || *length == 0 || *length > length_) { + return false; + } + *oid = p_; + return true; +} + +bool asn1_context::asn1_octet_string_get(const uint8_t** octet_string, size_t* length) { + if (get_byte() != kTagOctetString) { + return false; + } + if (!decode_length(length) || *length == 0 || *length > length_) { + return false; + } + *octet_string = p_; + return true; +} diff --git a/install/fuse_sdcard_install.cpp b/install/fuse_sdcard_install.cpp new file mode 100644 index 000000000..dde289f80 --- /dev/null +++ b/install/fuse_sdcard_install.cpp @@ -0,0 +1,206 @@ +/* + * 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. + */ + +#include "install/fuse_sdcard_install.h" + +#include <dirent.h> +#include <signal.h> +#include <sys/mount.h> +#include <sys/stat.h> +#include <sys/types.h> +#include <sys/wait.h> +#include <unistd.h> + +#include <algorithm> +#include <functional> +#include <memory> +#include <vector> + +#include <android-base/logging.h> +#include <android-base/strings.h> + +#include "bootloader_message/bootloader_message.h" +#include "fuse_provider.h" +#include "fuse_sideload.h" +#include "install/install.h" +#include "otautil/roots.h" + +static constexpr const char* SDCARD_ROOT = "/sdcard"; +// How long (in seconds) we wait for the fuse-provided package file to +// appear, before timing out. +static constexpr int SDCARD_INSTALL_TIMEOUT = 10; + +// Set the BCB to reboot back into recovery (it won't resume the install from +// sdcard though). +static void SetSdcardUpdateBootloaderMessage() { + std::vector<std::string> options; + std::string err; + if (!update_bootloader_message(options, &err)) { + LOG(ERROR) << "Failed to set BCB message: " << err; + } +} + +// Returns the selected filename, or an empty string. +static std::string BrowseDirectory(const std::string& path, Device* device, RecoveryUI* ui) { + ensure_path_mounted(path); + + std::unique_ptr<DIR, decltype(&closedir)> d(opendir(path.c_str()), closedir); + if (!d) { + PLOG(ERROR) << "error opening " << path; + return ""; + } + + std::vector<std::string> dirs; + std::vector<std::string> entries{ "../" }; // "../" is always the first entry. + + dirent* de; + while ((de = readdir(d.get())) != nullptr) { + std::string name(de->d_name); + + if (de->d_type == DT_DIR) { + // Skip "." and ".." entries. + if (name == "." || name == "..") continue; + dirs.push_back(name + "/"); + } else if (de->d_type == DT_REG && android::base::EndsWithIgnoreCase(name, ".zip")) { + entries.push_back(name); + } + } + + std::sort(dirs.begin(), dirs.end()); + std::sort(entries.begin(), entries.end()); + + // Append dirs to the entries list. + entries.insert(entries.end(), dirs.begin(), dirs.end()); + + std::vector<std::string> headers{ "Choose a package to install:", path }; + + size_t chosen_item = 0; + while (true) { + chosen_item = ui->ShowMenu( + headers, entries, chosen_item, true, + std::bind(&Device::HandleMenuKey, device, std::placeholders::_1, std::placeholders::_2)); + + // Return if WaitKey() was interrupted. + if (chosen_item == static_cast<size_t>(RecoveryUI::KeyError::INTERRUPTED)) { + return ""; + } + + const std::string& item = entries[chosen_item]; + if (chosen_item == 0) { + // Go up but continue browsing (if the caller is BrowseDirectory). + return ""; + } + + std::string new_path = path + "/" + item; + if (new_path.back() == '/') { + // Recurse down into a subdirectory. + new_path.pop_back(); + std::string result = BrowseDirectory(new_path, device, ui); + if (!result.empty()) return result; + } else { + // Selected a zip file: return the path to the caller. + return new_path; + } + } + + // Unreachable. +} + +static bool StartSdcardFuse(const std::string& path) { + auto file_data_reader = std::make_unique<FuseFileDataProvider>(path, 65536); + + if (!file_data_reader->Valid()) { + return false; + } + + // The installation process expects to find the sdcard unmounted. Unmount it with MNT_DETACH so + // that our open file continues to work but new references see it as unmounted. + umount2("/sdcard", MNT_DETACH); + + return run_fuse_sideload(std::move(file_data_reader)) == 0; +} + +int ApplyFromSdcard(Device* device, bool* wipe_cache, RecoveryUI* ui) { + if (ensure_path_mounted(SDCARD_ROOT) != 0) { + LOG(ERROR) << "\n-- Couldn't mount " << SDCARD_ROOT << ".\n"; + return INSTALL_ERROR; + } + + std::string path = BrowseDirectory(SDCARD_ROOT, device, ui); + if (path.empty()) { + LOG(ERROR) << "\n-- No package file selected.\n"; + ensure_path_unmounted(SDCARD_ROOT); + return INSTALL_ERROR; + } + + ui->Print("\n-- Install %s ...\n", path.c_str()); + SetSdcardUpdateBootloaderMessage(); + + // We used to use fuse in a thread as opposed to a process. Since accessing + // through fuse involves going from kernel to userspace to kernel, it leads + // to deadlock when a page fault occurs. (Bug: 26313124) + pid_t child; + if ((child = fork()) == 0) { + bool status = StartSdcardFuse(path); + + _exit(status ? EXIT_SUCCESS : EXIT_FAILURE); + } + + // FUSE_SIDELOAD_HOST_PATHNAME will start to exist once the fuse in child + // process is ready. + int result = INSTALL_ERROR; + int status; + bool waited = false; + for (int i = 0; i < SDCARD_INSTALL_TIMEOUT; ++i) { + if (waitpid(child, &status, WNOHANG) == -1) { + result = INSTALL_ERROR; + waited = true; + break; + } + + struct stat sb; + if (stat(FUSE_SIDELOAD_HOST_PATHNAME, &sb) == -1) { + if (errno == ENOENT && i < SDCARD_INSTALL_TIMEOUT - 1) { + sleep(1); + continue; + } else { + LOG(ERROR) << "Timed out waiting for the fuse-provided package."; + result = INSTALL_ERROR; + kill(child, SIGKILL); + break; + } + } + + result = install_package(FUSE_SIDELOAD_HOST_PATHNAME, wipe_cache, false, 0 /*retry_count*/, ui); + break; + } + + if (!waited) { + // Calling stat() on this magic filename signals the fuse + // filesystem to shut down. + struct stat sb; + stat(FUSE_SIDELOAD_HOST_EXIT_PATHNAME, &sb); + + waitpid(child, &status, 0); + } + + if (!WIFEXITED(status) || WEXITSTATUS(status) != 0) { + LOG(ERROR) << "Error exit from the fuse process: " << WEXITSTATUS(status); + } + + ensure_path_unmounted(SDCARD_ROOT); + return result; +} diff --git a/install/include/install/adb_install.h b/install/include/install/adb_install.h new file mode 100644 index 000000000..dbc824501 --- /dev/null +++ b/install/include/install/adb_install.h @@ -0,0 +1,21 @@ +/* + * Copyright (C) 2012 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. + */ + +#pragma once + +#include <recovery_ui/ui.h> + +int apply_from_adb(bool* wipe_cache, RecoveryUI* ui); diff --git a/install/include/install/fuse_sdcard_install.h b/install/include/install/fuse_sdcard_install.h new file mode 100644 index 000000000..345aea45b --- /dev/null +++ b/install/include/install/fuse_sdcard_install.h @@ -0,0 +1,22 @@ +/* + * 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. + */ + +#pragma once + +#include "recovery_ui/device.h" +#include "recovery_ui/ui.h" + +int ApplyFromSdcard(Device* device, bool* wipe_cache, RecoveryUI* ui); diff --git a/install/include/install/install.h b/install/include/install/install.h new file mode 100644 index 000000000..74fb3d170 --- /dev/null +++ b/install/include/install/install.h @@ -0,0 +1,69 @@ +/* + * Copyright (C) 2007 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. + */ + +#pragma once + +#include <stddef.h> + +#include <map> +#include <string> +#include <vector> + +#include <ziparchive/zip_archive.h> + +#include "package.h" +#include "recovery_ui/ui.h" + +enum InstallResult { + INSTALL_SUCCESS, + INSTALL_ERROR, + INSTALL_CORRUPT, + INSTALL_NONE, + INSTALL_SKIPPED, + INSTALL_RETRY, + INSTALL_KEY_INTERRUPTED +}; + +enum class OtaType { + AB, + BLOCK, + BRICK, +}; + +// Installs the given update package. If INSTALL_SUCCESS is returned and *wipe_cache is true on +// exit, caller should wipe the cache partition. +int install_package(const std::string& package, bool* wipe_cache, bool needs_mount, int retry_count, + RecoveryUI* ui); + +// Verifies the package by ota keys. Returns true if the package is verified successfully, +// otherwise returns false. +bool verify_package(Package* package, RecoveryUI* ui); + +// Reads meta data file of the package; parses each line in the format "key=value"; and writes the +// result to |metadata|. Return true if succeed, otherwise return false. +bool ReadMetadataFromPackage(ZipArchiveHandle zip, std::map<std::string, std::string>* metadata); + +// Reads the "recovery.wipe" entry in the zip archive returns a list of partitions to wipe. +std::vector<std::string> GetWipePartitionList(Package* wipe_package); + +// Verifies the compatibility info in a Treble-compatible package. Returns true directly if the +// entry doesn't exist. +bool verify_package_compatibility(ZipArchiveHandle package_zip); + +// Checks if the the metadata in the OTA package has expected values. Returns 0 on success. +// Mandatory checks: ota-type, pre-device and serial number(if presents) +// AB OTA specific checks: pre-build version, fingerprint, timestamp. +int CheckPackageMetadata(const std::map<std::string, std::string>& metadata, OtaType ota_type); diff --git a/install/include/install/package.h b/install/include/install/package.h new file mode 100644 index 000000000..cd44d10be --- /dev/null +++ b/install/include/install/package.h @@ -0,0 +1,53 @@ +/* + * 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. + */ + +#pragma once + +#include <stdint.h> + +#include <functional> +#include <map> +#include <memory> +#include <string> +#include <vector> + +#include <ziparchive/zip_archive.h> + +#include "verifier.h" + +// This class serves as a wrapper for an OTA update package. It aims to provide the common +// interface for both packages loaded in memory and packages read from fd. +class Package : public VerifierInterface { + public: + static std::unique_ptr<Package> CreateMemoryPackage( + const std::string& path, const std::function<void(float)>& set_progress); + static std::unique_ptr<Package> CreateMemoryPackage( + std::vector<uint8_t> content, const std::function<void(float)>& set_progress); + static std::unique_ptr<Package> CreateFilePackage(const std::string& path, + const std::function<void(float)>& set_progress); + + virtual ~Package() = default; + + // Opens the package as a zip file and returns the ZipArchiveHandle. + virtual ZipArchiveHandle GetZipArchiveHandle() = 0; + + // Updates the progress in fraction during package verification. + void SetProgress(float progress) override; + + protected: + // An optional function to update the progress. + std::function<void(float)> set_progress_; +}; diff --git a/install/include/install/verifier.h b/install/include/install/verifier.h new file mode 100644 index 000000000..f9e947580 --- /dev/null +++ b/install/include/install/verifier.h @@ -0,0 +1,101 @@ +/* + * Copyright (C) 2008 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. + */ + +#pragma once + +#include <stdint.h> + +#include <functional> +#include <memory> +#include <vector> + +#include <openssl/ec_key.h> +#include <openssl/rsa.h> +#include <openssl/sha.h> + +constexpr size_t MiB = 1024 * 1024; + +using HasherUpdateCallback = std::function<void(const uint8_t* addr, uint64_t size)>; + +struct RSADeleter { + void operator()(RSA* rsa) const { + RSA_free(rsa); + } +}; + +struct ECKEYDeleter { + void operator()(EC_KEY* ec_key) const { + EC_KEY_free(ec_key); + } +}; + +struct Certificate { + typedef enum { + KEY_TYPE_RSA, + KEY_TYPE_EC, + } KeyType; + + Certificate(int hash_len_, KeyType key_type_, std::unique_ptr<RSA, RSADeleter>&& rsa_, + std::unique_ptr<EC_KEY, ECKEYDeleter>&& ec_) + : hash_len(hash_len_), key_type(key_type_), rsa(std::move(rsa_)), ec(std::move(ec_)) {} + + // SHA_DIGEST_LENGTH (SHA-1) or SHA256_DIGEST_LENGTH (SHA-256) + int hash_len; + KeyType key_type; + std::unique_ptr<RSA, RSADeleter> rsa; + std::unique_ptr<EC_KEY, ECKEYDeleter> ec; +}; + +class VerifierInterface { + public: + virtual ~VerifierInterface() = default; + + // Returns the package size in bytes. + virtual uint64_t GetPackageSize() const = 0; + + // Reads |byte_count| data starting from |offset|, and puts the result in |buffer|. + virtual bool ReadFullyAtOffset(uint8_t* buffer, uint64_t byte_count, uint64_t offset) = 0; + + // Updates the hash contexts for |length| bytes data starting from |start|. + virtual bool UpdateHashAtOffset(const std::vector<HasherUpdateCallback>& hashers, uint64_t start, + uint64_t length) = 0; + + // Updates the progress in fraction during package verification. + virtual void SetProgress(float progress) = 0; +}; + +// Looks for an RSA signature embedded in the .ZIP file comment given the path to the zip. +// Verifies that it matches one of the given public keys. Returns VERIFY_SUCCESS or +// VERIFY_FAILURE (if any error is encountered or no key matches the signature). +int verify_file(VerifierInterface* package, const std::vector<Certificate>& keys); + +// Checks that the RSA key has a modulus of 2048 or 4096 bits long, and public exponent is 3 or +// 65537. +bool CheckRSAKey(const std::unique_ptr<RSA, RSADeleter>& rsa); + +// Checks that the field size of the curve for the EC key is 256 bits. +bool CheckECKey(const std::unique_ptr<EC_KEY, ECKEYDeleter>& ec_key); + +// Parses a PEM-encoded x509 certificate from the given buffer and saves it into |cert|. Returns +// false if there is a parsing failure or the signature's encryption algorithm is not supported. +bool LoadCertificateFromBuffer(const std::vector<uint8_t>& pem_content, Certificate* cert); + +// Iterates over the zip entries with the suffix "x509.pem" and returns a list of recognized +// certificates. Returns an empty list if we fail to parse any of the entries. +std::vector<Certificate> LoadKeysFromZipfile(const std::string& zip_name); + +#define VERIFY_SUCCESS 0 +#define VERIFY_FAILURE 1 diff --git a/install/include/private/asn1_decoder.h b/install/include/private/asn1_decoder.h new file mode 100644 index 000000000..e5337d9c4 --- /dev/null +++ b/install/include/private/asn1_decoder.h @@ -0,0 +1,56 @@ +/* + * Copyright (C) 2013 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. + */ + +#ifndef ASN1_DECODER_H_ +#define ASN1_DECODER_H_ + +#include <stddef.h> +#include <stdint.h> + +class asn1_context { + public: + asn1_context(const uint8_t* buffer, size_t length) : p_(buffer), length_(length), app_type_(0) {} + int asn1_constructed_type() const; + asn1_context* asn1_constructed_get(); + bool asn1_constructed_skip_all(); + asn1_context* asn1_sequence_get(); + asn1_context* asn1_set_get(); + bool asn1_sequence_next(); + bool asn1_oid_get(const uint8_t** oid, size_t* length); + bool asn1_octet_string_get(const uint8_t** octet_string, size_t* length); + + private: + static constexpr int kMaskConstructed = 0xE0; + static constexpr int kMaskTag = 0x7F; + static constexpr int kMaskAppType = 0x1F; + + static constexpr int kTagOctetString = 0x04; + static constexpr int kTagOid = 0x06; + static constexpr int kTagSequence = 0x30; + static constexpr int kTagSet = 0x31; + static constexpr int kTagConstructed = 0xA0; + + int peek_byte() const; + int get_byte(); + bool skip_bytes(size_t num_skip); + bool decode_length(size_t* out_len); + + const uint8_t* p_; + size_t length_; + int app_type_; +}; + +#endif /* ASN1_DECODER_H_ */ diff --git a/install/include/private/setup_commands.h b/install/include/private/setup_commands.h new file mode 100644 index 000000000..7fdc741d6 --- /dev/null +++ b/install/include/private/setup_commands.h @@ -0,0 +1,39 @@ +/* + * Copyright (C) 2017 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. + */ + +// Private headers exposed for testing purpose only. + +#pragma once + +#include <string> +#include <vector> + +#include <ziparchive/zip_archive.h> + +// Sets up the commands for a non-A/B update. Extracts the updater binary from the open zip archive +// |zip| located at |package|. Stores the command line that should be called into |cmd|. The +// |status_fd| is the file descriptor the child process should use to report back the progress of +// the update. +int SetUpNonAbUpdateCommands(const std::string& package, ZipArchiveHandle zip, int retry_count, + int status_fd, std::vector<std::string>* cmd); + +// Sets up the commands for an A/B update. Extracts the needed entries from the open zip archive +// |zip| located at |package|. Stores the command line that should be called into |cmd|. The +// |status_fd| is the file descriptor the child process should use to report back the progress of +// the update. Note that since this applies to the sideloading flow only, it takes one less +// parameter |retry_count| than the non-A/B version. +int SetUpAbUpdateCommands(const std::string& package, ZipArchiveHandle zip, int status_fd, + std::vector<std::string>* cmd); diff --git a/install/install.cpp b/install/install.cpp new file mode 100644 index 000000000..a1124c361 --- /dev/null +++ b/install/install.cpp @@ -0,0 +1,730 @@ +/* + * Copyright (C) 2007 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 "install/install.h" + +#include <ctype.h> +#include <errno.h> +#include <fcntl.h> +#include <inttypes.h> +#include <limits.h> +#include <string.h> +#include <sys/stat.h> +#include <sys/wait.h> +#include <unistd.h> + +#include <algorithm> +#include <atomic> +#include <chrono> +#include <condition_variable> +#include <functional> +#include <limits> +#include <mutex> +#include <thread> +#include <vector> + +#include <android-base/file.h> +#include <android-base/logging.h> +#include <android-base/parsedouble.h> +#include <android-base/parseint.h> +#include <android-base/properties.h> +#include <android-base/stringprintf.h> +#include <android-base/strings.h> +#include <android-base/unique_fd.h> +#include <vintf/VintfObjectRecovery.h> + +#include "install/package.h" +#include "install/verifier.h" +#include "otautil/error_code.h" +#include "otautil/paths.h" +#include "otautil/roots.h" +#include "otautil/sysutil.h" +#include "otautil/thermalutil.h" +#include "private/setup_commands.h" +#include "recovery_ui/ui.h" + +using namespace std::chrono_literals; + +static constexpr int kRecoveryApiVersion = 3; +// Assert the version defined in code and in Android.mk are consistent. +static_assert(kRecoveryApiVersion == RECOVERY_API_VERSION, "Mismatching recovery API versions."); + +// Default allocation of progress bar segments to operations +static constexpr int VERIFICATION_PROGRESS_TIME = 60; +static constexpr float VERIFICATION_PROGRESS_FRACTION = 0.25; + +static std::condition_variable finish_log_temperature; + +bool ReadMetadataFromPackage(ZipArchiveHandle zip, std::map<std::string, std::string>* metadata) { + CHECK(metadata != nullptr); + + static constexpr const char* METADATA_PATH = "META-INF/com/android/metadata"; + ZipString path(METADATA_PATH); + ZipEntry entry; + if (FindEntry(zip, path, &entry) != 0) { + LOG(ERROR) << "Failed to find " << METADATA_PATH; + return false; + } + + uint32_t length = entry.uncompressed_length; + std::string metadata_string(length, '\0'); + int32_t err = + ExtractToMemory(zip, &entry, reinterpret_cast<uint8_t*>(&metadata_string[0]), length); + if (err != 0) { + LOG(ERROR) << "Failed to extract " << METADATA_PATH << ": " << ErrorCodeString(err); + return false; + } + + for (const std::string& line : android::base::Split(metadata_string, "\n")) { + size_t eq = line.find('='); + if (eq != std::string::npos) { + metadata->emplace(android::base::Trim(line.substr(0, eq)), + android::base::Trim(line.substr(eq + 1))); + } + } + + return true; +} + +// Gets the value for the given key in |metadata|. Returns an emtpy string if the key isn't +// present. +static std::string get_value(const std::map<std::string, std::string>& metadata, + const std::string& key) { + const auto& it = metadata.find(key); + return (it == metadata.end()) ? "" : it->second; +} + +static std::string OtaTypeToString(OtaType type) { + switch (type) { + case OtaType::AB: + return "AB"; + case OtaType::BLOCK: + return "BLOCK"; + case OtaType::BRICK: + return "BRICK"; + } +} + +// Read the build.version.incremental of src/tgt from the metadata and log it to last_install. +static void ReadSourceTargetBuild(const std::map<std::string, std::string>& metadata, + std::vector<std::string>* log_buffer) { + // Examples of the pre-build and post-build strings in metadata: + // pre-build-incremental=2943039 + // post-build-incremental=2951741 + auto source_build = get_value(metadata, "pre-build-incremental"); + if (!source_build.empty()) { + log_buffer->push_back("source_build: " + source_build); + } + + auto target_build = get_value(metadata, "post-build-incremental"); + if (!target_build.empty()) { + log_buffer->push_back("target_build: " + target_build); + } +} + +// Checks the build version, fingerprint and timestamp in the metadata of the A/B package. +// Downgrading is not allowed unless explicitly enabled in the package and only for +// incremental packages. +static int CheckAbSpecificMetadata(const std::map<std::string, std::string>& metadata) { + // Incremental updates should match the current build. + auto device_pre_build = android::base::GetProperty("ro.build.version.incremental", ""); + auto pkg_pre_build = get_value(metadata, "pre-build-incremental"); + if (!pkg_pre_build.empty() && pkg_pre_build != device_pre_build) { + LOG(ERROR) << "Package is for source build " << pkg_pre_build << " but expected " + << device_pre_build; + return INSTALL_ERROR; + } + + auto device_fingerprint = android::base::GetProperty("ro.build.fingerprint", ""); + auto pkg_pre_build_fingerprint = get_value(metadata, "pre-build"); + if (!pkg_pre_build_fingerprint.empty() && pkg_pre_build_fingerprint != device_fingerprint) { + LOG(ERROR) << "Package is for source build " << pkg_pre_build_fingerprint << " but expected " + << device_fingerprint; + return INSTALL_ERROR; + } + + // Check for downgrade version. + int64_t build_timestamp = + android::base::GetIntProperty("ro.build.date.utc", std::numeric_limits<int64_t>::max()); + int64_t pkg_post_timestamp = 0; + // We allow to full update to the same version we are running, in case there + // is a problem with the current copy of that version. + auto pkg_post_timestamp_string = get_value(metadata, "post-timestamp"); + if (pkg_post_timestamp_string.empty() || + !android::base::ParseInt(pkg_post_timestamp_string, &pkg_post_timestamp) || + pkg_post_timestamp < build_timestamp) { + if (get_value(metadata, "ota-downgrade") != "yes") { + LOG(ERROR) << "Update package is older than the current build, expected a build " + "newer than timestamp " + << build_timestamp << " but package has timestamp " << pkg_post_timestamp + << " and downgrade not allowed."; + return INSTALL_ERROR; + } + if (pkg_pre_build_fingerprint.empty()) { + LOG(ERROR) << "Downgrade package must have a pre-build version set, not allowed."; + return INSTALL_ERROR; + } + } + + return 0; +} + +int CheckPackageMetadata(const std::map<std::string, std::string>& metadata, OtaType ota_type) { + auto package_ota_type = get_value(metadata, "ota-type"); + auto expected_ota_type = OtaTypeToString(ota_type); + if (ota_type != OtaType::AB && ota_type != OtaType::BRICK) { + LOG(INFO) << "Skip package metadata check for ota type " << expected_ota_type; + return 0; + } + + if (package_ota_type != expected_ota_type) { + LOG(ERROR) << "Unexpected ota package type, expects " << expected_ota_type << ", actual " + << package_ota_type; + return INSTALL_ERROR; + } + + auto device = android::base::GetProperty("ro.product.device", ""); + auto pkg_device = get_value(metadata, "pre-device"); + if (pkg_device != device || pkg_device.empty()) { + LOG(ERROR) << "Package is for product " << pkg_device << " but expected " << device; + return INSTALL_ERROR; + } + + // We allow the package to not have any serialno; and we also allow it to carry multiple serial + // numbers split by "|"; e.g. serialno=serialno1|serialno2|serialno3 ... We will fail the + // verification if the device's serialno doesn't match any of these carried numbers. + auto pkg_serial_no = get_value(metadata, "serialno"); + if (!pkg_serial_no.empty()) { + auto device_serial_no = android::base::GetProperty("ro.serialno", ""); + bool serial_number_match = false; + for (const auto& number : android::base::Split(pkg_serial_no, "|")) { + if (device_serial_no == android::base::Trim(number)) { + serial_number_match = true; + } + } + if (!serial_number_match) { + LOG(ERROR) << "Package is for serial " << pkg_serial_no; + return INSTALL_ERROR; + } + } + + if (ota_type == OtaType::AB) { + return CheckAbSpecificMetadata(metadata); + } + + return 0; +} + +int SetUpAbUpdateCommands(const std::string& package, ZipArchiveHandle zip, int status_fd, + std::vector<std::string>* cmd) { + CHECK(cmd != nullptr); + + // For A/B updates we extract the payload properties to a buffer and obtain the RAW payload offset + // in the zip file. + static constexpr const char* AB_OTA_PAYLOAD_PROPERTIES = "payload_properties.txt"; + ZipString property_name(AB_OTA_PAYLOAD_PROPERTIES); + ZipEntry properties_entry; + if (FindEntry(zip, property_name, &properties_entry) != 0) { + LOG(ERROR) << "Failed to find " << AB_OTA_PAYLOAD_PROPERTIES; + return INSTALL_CORRUPT; + } + uint32_t properties_entry_length = properties_entry.uncompressed_length; + std::vector<uint8_t> payload_properties(properties_entry_length); + int32_t err = + ExtractToMemory(zip, &properties_entry, payload_properties.data(), properties_entry_length); + if (err != 0) { + LOG(ERROR) << "Failed to extract " << AB_OTA_PAYLOAD_PROPERTIES << ": " << ErrorCodeString(err); + return INSTALL_CORRUPT; + } + + static constexpr const char* AB_OTA_PAYLOAD = "payload.bin"; + ZipString payload_name(AB_OTA_PAYLOAD); + ZipEntry payload_entry; + if (FindEntry(zip, payload_name, &payload_entry) != 0) { + LOG(ERROR) << "Failed to find " << AB_OTA_PAYLOAD; + return INSTALL_CORRUPT; + } + long payload_offset = payload_entry.offset; + *cmd = { + "/system/bin/update_engine_sideload", + "--payload=file://" + package, + android::base::StringPrintf("--offset=%ld", payload_offset), + "--headers=" + std::string(payload_properties.begin(), payload_properties.end()), + android::base::StringPrintf("--status_fd=%d", status_fd), + }; + return 0; +} + +int SetUpNonAbUpdateCommands(const std::string& package, ZipArchiveHandle zip, int retry_count, + int status_fd, std::vector<std::string>* cmd) { + CHECK(cmd != nullptr); + + // In non-A/B updates we extract the update binary from the package. + static constexpr const char* UPDATE_BINARY_NAME = "META-INF/com/google/android/update-binary"; + ZipString binary_name(UPDATE_BINARY_NAME); + ZipEntry binary_entry; + if (FindEntry(zip, binary_name, &binary_entry) != 0) { + LOG(ERROR) << "Failed to find update binary " << UPDATE_BINARY_NAME; + return INSTALL_CORRUPT; + } + + const std::string binary_path = Paths::Get().temporary_update_binary(); + unlink(binary_path.c_str()); + android::base::unique_fd fd( + open(binary_path.c_str(), O_CREAT | O_WRONLY | O_TRUNC | O_CLOEXEC, 0755)); + if (fd == -1) { + PLOG(ERROR) << "Failed to create " << binary_path; + return INSTALL_ERROR; + } + + int32_t error = ExtractEntryToFile(zip, &binary_entry, fd); + if (error != 0) { + LOG(ERROR) << "Failed to extract " << UPDATE_BINARY_NAME << ": " << ErrorCodeString(error); + return INSTALL_ERROR; + } + + // When executing the update binary contained in the package, the arguments passed are: + // - the version number for this interface + // - an FD to which the program can write in order to update the progress bar. + // - the name of the package zip file. + // - an optional argument "retry" if this update is a retry of a failed update attempt. + *cmd = { + binary_path, + std::to_string(kRecoveryApiVersion), + std::to_string(status_fd), + package, + }; + if (retry_count > 0) { + cmd->push_back("retry"); + } + return 0; +} + +static void log_max_temperature(int* max_temperature, const std::atomic<bool>& logger_finished) { + CHECK(max_temperature != nullptr); + std::mutex mtx; + std::unique_lock<std::mutex> lck(mtx); + while (!logger_finished.load() && + finish_log_temperature.wait_for(lck, 20s) == std::cv_status::timeout) { + *max_temperature = std::max(*max_temperature, GetMaxValueFromThermalZone()); + } +} + +// If the package contains an update binary, extract it and run it. +static int try_update_binary(const std::string& package, ZipArchiveHandle zip, bool* wipe_cache, + std::vector<std::string>* log_buffer, int retry_count, + int* max_temperature, RecoveryUI* ui) { + std::map<std::string, std::string> metadata; + if (!ReadMetadataFromPackage(zip, &metadata)) { + LOG(ERROR) << "Failed to parse metadata in the zip file"; + return INSTALL_CORRUPT; + } + + bool is_ab = android::base::GetBoolProperty("ro.build.ab_update", false); + // Verifies against the metadata in the package first. + if (int check_status = is_ab ? CheckPackageMetadata(metadata, OtaType::AB) : 0; + check_status != 0) { + log_buffer->push_back(android::base::StringPrintf("error: %d", kUpdateBinaryCommandFailure)); + return check_status; + } + + ReadSourceTargetBuild(metadata, log_buffer); + + // The updater in child process writes to the pipe to communicate with recovery. + android::base::unique_fd pipe_read, pipe_write; + // Explicitly disable O_CLOEXEC using 0 as the flags (last) parameter to Pipe + // so that the child updater process will recieve a non-closed fd. + if (!android::base::Pipe(&pipe_read, &pipe_write, 0)) { + PLOG(ERROR) << "Failed to create pipe for updater-recovery communication"; + return INSTALL_CORRUPT; + } + + // The updater-recovery communication protocol. + // + // progress <frac> <secs> + // fill up the next <frac> part of of the progress bar over <secs> seconds. If <secs> is + // zero, use `set_progress` commands to manually control the progress of this segment of the + // bar. + // + // set_progress <frac> + // <frac> should be between 0.0 and 1.0; sets the progress bar within the segment defined by + // the most recent progress command. + // + // ui_print <string> + // display <string> on the screen. + // + // wipe_cache + // a wipe of cache will be performed following a successful installation. + // + // clear_display + // turn off the text display. + // + // enable_reboot + // packages can explicitly request that they want the user to be able to reboot during + // installation (useful for debugging packages that don't exit). + // + // retry_update + // updater encounters some issue during the update. It requests a reboot to retry the same + // package automatically. + // + // log <string> + // updater requests logging the string (e.g. cause of the failure). + // + + std::vector<std::string> args; + if (int update_status = + is_ab ? SetUpAbUpdateCommands(package, zip, pipe_write.get(), &args) + : SetUpNonAbUpdateCommands(package, zip, retry_count, pipe_write.get(), &args); + update_status != 0) { + log_buffer->push_back(android::base::StringPrintf("error: %d", kUpdateBinaryCommandFailure)); + return update_status; + } + + pid_t pid = fork(); + if (pid == -1) { + PLOG(ERROR) << "Failed to fork update binary"; + log_buffer->push_back(android::base::StringPrintf("error: %d", kForkUpdateBinaryFailure)); + return INSTALL_ERROR; + } + + if (pid == 0) { + umask(022); + pipe_read.reset(); + + // Convert the std::string vector to a NULL-terminated char* vector suitable for execv. + auto chr_args = StringVectorToNullTerminatedArray(args); + execv(chr_args[0], chr_args.data()); + // We shouldn't use LOG/PLOG in the forked process, since they may cause the child process to + // hang. This deadlock results from an improperly copied mutex in the ui functions. + // (Bug: 34769056) + fprintf(stdout, "E:Can't run %s (%s)\n", chr_args[0], strerror(errno)); + _exit(EXIT_FAILURE); + } + pipe_write.reset(); + + std::atomic<bool> logger_finished(false); + std::thread temperature_logger(log_max_temperature, max_temperature, std::ref(logger_finished)); + + *wipe_cache = false; + bool retry_update = false; + + char buffer[1024]; + FILE* from_child = android::base::Fdopen(std::move(pipe_read), "r"); + while (fgets(buffer, sizeof(buffer), from_child) != nullptr) { + std::string line(buffer); + size_t space = line.find_first_of(" \n"); + std::string command(line.substr(0, space)); + if (command.empty()) continue; + + // Get rid of the leading and trailing space and/or newline. + std::string args = space == std::string::npos ? "" : android::base::Trim(line.substr(space)); + + if (command == "progress") { + std::vector<std::string> tokens = android::base::Split(args, " "); + double fraction; + int seconds; + if (tokens.size() == 2 && android::base::ParseDouble(tokens[0].c_str(), &fraction) && + android::base::ParseInt(tokens[1], &seconds)) { + ui->ShowProgress(fraction * (1 - VERIFICATION_PROGRESS_FRACTION), seconds); + } else { + LOG(ERROR) << "invalid \"progress\" parameters: " << line; + } + } else if (command == "set_progress") { + std::vector<std::string> tokens = android::base::Split(args, " "); + double fraction; + if (tokens.size() == 1 && android::base::ParseDouble(tokens[0].c_str(), &fraction)) { + ui->SetProgress(fraction); + } else { + LOG(ERROR) << "invalid \"set_progress\" parameters: " << line; + } + } else if (command == "ui_print") { + ui->PrintOnScreenOnly("%s\n", args.c_str()); + fflush(stdout); + } else if (command == "wipe_cache") { + *wipe_cache = true; + } else if (command == "clear_display") { + ui->SetBackground(RecoveryUI::NONE); + } else if (command == "enable_reboot") { + // packages can explicitly request that they want the user + // to be able to reboot during installation (useful for + // debugging packages that don't exit). + ui->SetEnableReboot(true); + } else if (command == "retry_update") { + retry_update = true; + } else if (command == "log") { + if (!args.empty()) { + // Save the logging request from updater and write to last_install later. + log_buffer->push_back(args); + } else { + LOG(ERROR) << "invalid \"log\" parameters: " << line; + } + } else { + LOG(ERROR) << "unknown command [" << command << "]"; + } + } + fclose(from_child); + + int status; + waitpid(pid, &status, 0); + + logger_finished.store(true); + finish_log_temperature.notify_one(); + temperature_logger.join(); + + if (retry_update) { + return INSTALL_RETRY; + } + if (WIFEXITED(status)) { + if (WEXITSTATUS(status) != EXIT_SUCCESS) { + LOG(ERROR) << "Error in " << package << " (status " << WEXITSTATUS(status) << ")"; + return INSTALL_ERROR; + } + } else if (WIFSIGNALED(status)) { + LOG(ERROR) << "Error in " << package << " (killed by signal " << WTERMSIG(status) << ")"; + return INSTALL_ERROR; + } else { + LOG(FATAL) << "Invalid status code " << status; + } + + return INSTALL_SUCCESS; +} + +// Verifes the compatibility info in a Treble-compatible package. Returns true directly if the +// entry doesn't exist. Note that the compatibility info is packed in a zip file inside the OTA +// package. +bool verify_package_compatibility(ZipArchiveHandle package_zip) { + LOG(INFO) << "Verifying package compatibility..."; + + static constexpr const char* COMPATIBILITY_ZIP_ENTRY = "compatibility.zip"; + ZipString compatibility_entry_name(COMPATIBILITY_ZIP_ENTRY); + ZipEntry compatibility_entry; + if (FindEntry(package_zip, compatibility_entry_name, &compatibility_entry) != 0) { + LOG(INFO) << "Package doesn't contain " << COMPATIBILITY_ZIP_ENTRY << " entry"; + return true; + } + + std::string zip_content(compatibility_entry.uncompressed_length, '\0'); + int32_t ret; + if ((ret = ExtractToMemory(package_zip, &compatibility_entry, + reinterpret_cast<uint8_t*>(&zip_content[0]), + compatibility_entry.uncompressed_length)) != 0) { + LOG(ERROR) << "Failed to read " << COMPATIBILITY_ZIP_ENTRY << ": " << ErrorCodeString(ret); + return false; + } + + ZipArchiveHandle zip_handle; + ret = OpenArchiveFromMemory(static_cast<void*>(const_cast<char*>(zip_content.data())), + zip_content.size(), COMPATIBILITY_ZIP_ENTRY, &zip_handle); + if (ret != 0) { + LOG(ERROR) << "Failed to OpenArchiveFromMemory: " << ErrorCodeString(ret); + return false; + } + + // Iterate all the entries inside COMPATIBILITY_ZIP_ENTRY and read the contents. + void* cookie; + ret = StartIteration(zip_handle, &cookie, nullptr, nullptr); + if (ret != 0) { + LOG(ERROR) << "Failed to start iterating zip entries: " << ErrorCodeString(ret); + CloseArchive(zip_handle); + return false; + } + std::unique_ptr<void, decltype(&EndIteration)> guard(cookie, EndIteration); + + std::vector<std::string> compatibility_info; + ZipEntry info_entry; + ZipString info_name; + while (Next(cookie, &info_entry, &info_name) == 0) { + std::string content(info_entry.uncompressed_length, '\0'); + int32_t ret = ExtractToMemory(zip_handle, &info_entry, reinterpret_cast<uint8_t*>(&content[0]), + info_entry.uncompressed_length); + if (ret != 0) { + LOG(ERROR) << "Failed to read " << info_name.name << ": " << ErrorCodeString(ret); + CloseArchive(zip_handle); + return false; + } + compatibility_info.emplace_back(std::move(content)); + } + CloseArchive(zip_handle); + + // VintfObjectRecovery::CheckCompatibility returns zero on success. + std::string err; + int result = android::vintf::VintfObjectRecovery::CheckCompatibility(compatibility_info, &err); + if (result == 0) { + return true; + } + + LOG(ERROR) << "Failed to verify package compatibility (result " << result << "): " << err; + return false; +} + +static int really_install_package(const std::string& path, bool* wipe_cache, bool needs_mount, + std::vector<std::string>* log_buffer, int retry_count, + int* max_temperature, RecoveryUI* ui) { + ui->SetBackground(RecoveryUI::INSTALLING_UPDATE); + ui->Print("Finding update package...\n"); + // Give verification half the progress bar... + ui->SetProgressType(RecoveryUI::DETERMINATE); + ui->ShowProgress(VERIFICATION_PROGRESS_FRACTION, VERIFICATION_PROGRESS_TIME); + LOG(INFO) << "Update location: " << path; + + // Map the update package into memory. + ui->Print("Opening update package...\n"); + + if (needs_mount) { + if (path[0] == '@') { + ensure_path_mounted(path.substr(1)); + } else { + ensure_path_mounted(path); + } + } + + auto package = Package::CreateMemoryPackage( + path, std::bind(&RecoveryUI::SetProgress, ui, std::placeholders::_1)); + if (!package) { + log_buffer->push_back(android::base::StringPrintf("error: %d", kMapFileFailure)); + return INSTALL_CORRUPT; + } + + // Verify package. + if (!verify_package(package.get(), ui)) { + log_buffer->push_back(android::base::StringPrintf("error: %d", kZipVerificationFailure)); + return INSTALL_CORRUPT; + } + + // Try to open the package. + ZipArchiveHandle zip = package->GetZipArchiveHandle(); + if (!zip) { + log_buffer->push_back(android::base::StringPrintf("error: %d", kZipOpenFailure)); + return INSTALL_CORRUPT; + } + + // Additionally verify the compatibility of the package if it's a fresh install. + if (retry_count == 0 && !verify_package_compatibility(zip)) { + log_buffer->push_back(android::base::StringPrintf("error: %d", kPackageCompatibilityFailure)); + return INSTALL_CORRUPT; + } + + // Verify and install the contents of the package. + ui->Print("Installing update...\n"); + if (retry_count > 0) { + ui->Print("Retry attempt: %d\n", retry_count); + } + ui->SetEnableReboot(false); + int result = + try_update_binary(path, zip, wipe_cache, log_buffer, retry_count, max_temperature, ui); + ui->SetEnableReboot(true); + ui->Print("\n"); + + return result; +} + +int install_package(const std::string& path, bool* wipe_cache, bool needs_mount, int retry_count, + RecoveryUI* ui) { + CHECK(!path.empty()); + CHECK(wipe_cache != nullptr); + + auto start = std::chrono::system_clock::now(); + + int start_temperature = GetMaxValueFromThermalZone(); + int max_temperature = start_temperature; + + int result; + std::vector<std::string> log_buffer; + if (setup_install_mounts() != 0) { + LOG(ERROR) << "failed to set up expected mounts for install; aborting"; + result = INSTALL_ERROR; + } else { + result = really_install_package(path, wipe_cache, needs_mount, &log_buffer, retry_count, + &max_temperature, ui); + } + + // Measure the time spent to apply OTA update in seconds. + std::chrono::duration<double> duration = std::chrono::system_clock::now() - start; + int time_total = static_cast<int>(duration.count()); + + bool has_cache = volume_for_mount_point("/cache") != nullptr; + // Skip logging the uncrypt_status on devices without /cache. + if (has_cache) { + static constexpr const char* UNCRYPT_STATUS = "/cache/recovery/uncrypt_status"; + if (ensure_path_mounted(UNCRYPT_STATUS) != 0) { + LOG(WARNING) << "Can't mount " << UNCRYPT_STATUS; + } else { + std::string uncrypt_status; + if (!android::base::ReadFileToString(UNCRYPT_STATUS, &uncrypt_status)) { + PLOG(WARNING) << "failed to read uncrypt status"; + } else if (!android::base::StartsWith(uncrypt_status, "uncrypt_")) { + LOG(WARNING) << "corrupted uncrypt_status: " << uncrypt_status; + } else { + log_buffer.push_back(android::base::Trim(uncrypt_status)); + } + } + } + + // The first two lines need to be the package name and install result. + std::vector<std::string> log_header = { + path, + result == INSTALL_SUCCESS ? "1" : "0", + "time_total: " + std::to_string(time_total), + "retry: " + std::to_string(retry_count), + }; + + int end_temperature = GetMaxValueFromThermalZone(); + max_temperature = std::max(end_temperature, max_temperature); + if (start_temperature > 0) { + log_buffer.push_back("temperature_start: " + std::to_string(start_temperature)); + } + if (end_temperature > 0) { + log_buffer.push_back("temperature_end: " + std::to_string(end_temperature)); + } + if (max_temperature > 0) { + log_buffer.push_back("temperature_max: " + std::to_string(max_temperature)); + } + + std::string log_content = + android::base::Join(log_header, "\n") + "\n" + android::base::Join(log_buffer, "\n") + "\n"; + const std::string& install_file = Paths::Get().temporary_install_file(); + if (!android::base::WriteStringToFile(log_content, install_file)) { + PLOG(ERROR) << "failed to write " << install_file; + } + + // Write a copy into last_log. + LOG(INFO) << log_content; + + return result; +} + +bool verify_package(Package* package, RecoveryUI* ui) { + static constexpr const char* CERTIFICATE_ZIP_FILE = "/system/etc/security/otacerts.zip"; + std::vector<Certificate> loaded_keys = LoadKeysFromZipfile(CERTIFICATE_ZIP_FILE); + if (loaded_keys.empty()) { + LOG(ERROR) << "Failed to load keys"; + return false; + } + LOG(INFO) << loaded_keys.size() << " key(s) loaded from " << CERTIFICATE_ZIP_FILE; + + // Verify package. + ui->Print("Verifying update package...\n"); + auto t0 = std::chrono::system_clock::now(); + int err = verify_file(package, loaded_keys); + std::chrono::duration<double> duration = std::chrono::system_clock::now() - t0; + ui->Print("Update package verification took %.1f s (result %d).\n", duration.count(), err); + if (err != VERIFY_SUCCESS) { + LOG(ERROR) << "Signature verification failed"; + LOG(ERROR) << "error: " << kZipVerificationFailure; + return false; + } + return true; +} diff --git a/install/package.cpp b/install/package.cpp new file mode 100644 index 000000000..4402f4855 --- /dev/null +++ b/install/package.cpp @@ -0,0 +1,262 @@ +/* + * 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. + */ + +#include "install/package.h" + +#include <string.h> +#include <unistd.h> + +#include <android-base/file.h> +#include <android-base/logging.h> +#include <android-base/stringprintf.h> +#include <android-base/unique_fd.h> + +#include "otautil/error_code.h" +#include "otautil/sysutil.h" + +// This class wraps the package in memory, i.e. a memory mapped package, or a package loaded +// to a string/vector. +class MemoryPackage : public Package { + public: + // Constructs the class from a file. We will memory maps the file later. + MemoryPackage(const std::string& path, std::unique_ptr<MemMapping> map, + const std::function<void(float)>& set_progress); + + // Constructs the class from the package bytes in |content|. + MemoryPackage(std::vector<uint8_t> content, const std::function<void(float)>& set_progress); + + ~MemoryPackage() override; + + // Memory maps the package file if necessary. Initializes the start address and size of the + // package. + uint64_t GetPackageSize() const override { + return package_size_; + } + + bool ReadFullyAtOffset(uint8_t* buffer, uint64_t byte_count, uint64_t offset) override; + + ZipArchiveHandle GetZipArchiveHandle() override; + + bool UpdateHashAtOffset(const std::vector<HasherUpdateCallback>& hashers, uint64_t start, + uint64_t length) override; + + private: + const uint8_t* addr_; // Start address of the package in memory. + uint64_t package_size_; // Package size in bytes. + + // The memory mapped package. + std::unique_ptr<MemMapping> map_; + // A copy of the package content, valid only if we create the class with the exact bytes of + // the package. + std::vector<uint8_t> package_content_; + // The physical path to the package, empty if we create the class with the package content. + std::string path_; + + // The ZipArchiveHandle of the package. + ZipArchiveHandle zip_handle_; +}; + +void Package::SetProgress(float progress) { + if (set_progress_) { + set_progress_(progress); + } +} + +class FilePackage : public Package { + public: + FilePackage(android::base::unique_fd&& fd, uint64_t file_size, const std::string& path, + const std::function<void(float)>& set_progress); + + ~FilePackage() override; + + uint64_t GetPackageSize() const override { + return package_size_; + } + + bool ReadFullyAtOffset(uint8_t* buffer, uint64_t byte_count, uint64_t offset) override; + + ZipArchiveHandle GetZipArchiveHandle() override; + + bool UpdateHashAtOffset(const std::vector<HasherUpdateCallback>& hashers, uint64_t start, + uint64_t length) override; + + private: + android::base::unique_fd fd_; // The underlying fd to the open package. + uint64_t package_size_; + std::string path_; // The physical path to the package. + + ZipArchiveHandle zip_handle_; +}; + +std::unique_ptr<Package> Package::CreateMemoryPackage( + const std::string& path, const std::function<void(float)>& set_progress) { + std::unique_ptr<MemMapping> mmap = std::make_unique<MemMapping>(); + if (!mmap->MapFile(path)) { + LOG(ERROR) << "failed to map file"; + return nullptr; + } + + return std::make_unique<MemoryPackage>(path, std::move(mmap), set_progress); +} + +std::unique_ptr<Package> Package::CreateFilePackage( + const std::string& path, const std::function<void(float)>& set_progress) { + android::base::unique_fd fd(open(path.c_str(), O_RDONLY)); + if (fd == -1) { + PLOG(ERROR) << "Failed to open " << path; + return nullptr; + } + + off64_t file_size = lseek64(fd.get(), 0, SEEK_END); + if (file_size == -1) { + PLOG(ERROR) << "Failed to get the package size"; + return nullptr; + } + + return std::make_unique<FilePackage>(std::move(fd), file_size, path, set_progress); +} + +std::unique_ptr<Package> Package::CreateMemoryPackage( + std::vector<uint8_t> content, const std::function<void(float)>& set_progress) { + return std::make_unique<MemoryPackage>(std::move(content), set_progress); +} + +MemoryPackage::MemoryPackage(const std::string& path, std::unique_ptr<MemMapping> map, + const std::function<void(float)>& set_progress) + : map_(std::move(map)), path_(path), zip_handle_(nullptr) { + addr_ = map_->addr; + package_size_ = map_->length; + set_progress_ = set_progress; +} + +MemoryPackage::MemoryPackage(std::vector<uint8_t> content, + const std::function<void(float)>& set_progress) + : package_content_(std::move(content)), zip_handle_(nullptr) { + CHECK(!package_content_.empty()); + addr_ = package_content_.data(); + package_size_ = package_content_.size(); + set_progress_ = set_progress; +} + +MemoryPackage::~MemoryPackage() { + if (zip_handle_) { + CloseArchive(zip_handle_); + } +} + +bool MemoryPackage::ReadFullyAtOffset(uint8_t* buffer, uint64_t byte_count, uint64_t offset) { + if (byte_count > package_size_ || offset > package_size_ - byte_count) { + LOG(ERROR) << "Out of bound read, offset: " << offset << ", size: " << byte_count + << ", total package_size: " << package_size_; + return false; + } + memcpy(buffer, addr_ + offset, byte_count); + return true; +} + +bool MemoryPackage::UpdateHashAtOffset(const std::vector<HasherUpdateCallback>& hashers, + uint64_t start, uint64_t length) { + if (length > package_size_ || start > package_size_ - length) { + LOG(ERROR) << "Out of bound read, offset: " << start << ", size: " << length + << ", total package_size: " << package_size_; + return false; + } + + for (const auto& hasher : hashers) { + hasher(addr_ + start, length); + } + return true; +} + +ZipArchiveHandle MemoryPackage::GetZipArchiveHandle() { + if (zip_handle_) { + return zip_handle_; + } + + if (auto err = OpenArchiveFromMemory(const_cast<uint8_t*>(addr_), package_size_, path_.c_str(), + &zip_handle_); + err != 0) { + LOG(ERROR) << "Can't open package" << path_ << " : " << ErrorCodeString(err); + return nullptr; + } + + return zip_handle_; +} + +FilePackage::FilePackage(android::base::unique_fd&& fd, uint64_t file_size, const std::string& path, + const std::function<void(float)>& set_progress) + : fd_(std::move(fd)), package_size_(file_size), path_(path), zip_handle_(nullptr) { + set_progress_ = set_progress; +} + +FilePackage::~FilePackage() { + if (zip_handle_) { + CloseArchive(zip_handle_); + } +} + +bool FilePackage::ReadFullyAtOffset(uint8_t* buffer, uint64_t byte_count, uint64_t offset) { + if (byte_count > package_size_ || offset > package_size_ - byte_count) { + LOG(ERROR) << "Out of bound read, offset: " << offset << ", size: " << byte_count + << ", total package_size: " << package_size_; + return false; + } + + if (!android::base::ReadFullyAtOffset(fd_.get(), buffer, byte_count, offset)) { + PLOG(ERROR) << "Failed to read " << byte_count << " bytes data at offset " << offset; + return false; + } + + return true; +} + +bool FilePackage::UpdateHashAtOffset(const std::vector<HasherUpdateCallback>& hashers, + uint64_t start, uint64_t length) { + if (length > package_size_ || start > package_size_ - length) { + LOG(ERROR) << "Out of bound read, offset: " << start << ", size: " << length + << ", total package_size: " << package_size_; + return false; + } + + uint64_t so_far = 0; + while (so_far < length) { + uint64_t read_size = std::min<uint64_t>(length - so_far, 16 * MiB); + std::vector<uint8_t> buffer(read_size); + if (!ReadFullyAtOffset(buffer.data(), read_size, start + so_far)) { + return false; + } + + for (const auto& hasher : hashers) { + hasher(buffer.data(), read_size); + } + so_far += read_size; + } + + return true; +} + +ZipArchiveHandle FilePackage::GetZipArchiveHandle() { + if (zip_handle_) { + return zip_handle_; + } + + if (auto err = OpenArchiveFd(fd_.get(), path_.c_str(), &zip_handle_); err != 0) { + LOG(ERROR) << "Can't open package" << path_ << " : " << ErrorCodeString(err); + return nullptr; + } + + return zip_handle_; +} diff --git a/install/verifier.cpp b/install/verifier.cpp new file mode 100644 index 000000000..6ba1d77c3 --- /dev/null +++ b/install/verifier.cpp @@ -0,0 +1,468 @@ +/* + * Copyright (C) 2008 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 "install/verifier.h" + +#include <errno.h> +#include <stdio.h> +#include <stdlib.h> +#include <string.h> + +#include <algorithm> +#include <functional> +#include <memory> +#include <vector> + +#include <android-base/logging.h> +#include <openssl/bio.h> +#include <openssl/bn.h> +#include <openssl/ecdsa.h> +#include <openssl/evp.h> +#include <openssl/obj_mac.h> +#include <openssl/pem.h> +#include <openssl/rsa.h> +#include <ziparchive/zip_archive.h> + +#include "otautil/print_sha1.h" +#include "private/asn1_decoder.h" + +/* + * Simple version of PKCS#7 SignedData extraction. This extracts the + * signature OCTET STRING to be used for signature verification. + * + * For full details, see http://www.ietf.org/rfc/rfc3852.txt + * + * The PKCS#7 structure looks like: + * + * SEQUENCE (ContentInfo) + * OID (ContentType) + * [0] (content) + * SEQUENCE (SignedData) + * INTEGER (version CMSVersion) + * SET (DigestAlgorithmIdentifiers) + * SEQUENCE (EncapsulatedContentInfo) + * [0] (CertificateSet OPTIONAL) + * [1] (RevocationInfoChoices OPTIONAL) + * SET (SignerInfos) + * SEQUENCE (SignerInfo) + * INTEGER (CMSVersion) + * SEQUENCE (SignerIdentifier) + * SEQUENCE (DigestAlgorithmIdentifier) + * SEQUENCE (SignatureAlgorithmIdentifier) + * OCTET STRING (SignatureValue) + */ +static bool read_pkcs7(const uint8_t* pkcs7_der, size_t pkcs7_der_len, + std::vector<uint8_t>* sig_der) { + CHECK(sig_der != nullptr); + sig_der->clear(); + + asn1_context ctx(pkcs7_der, pkcs7_der_len); + + std::unique_ptr<asn1_context> pkcs7_seq(ctx.asn1_sequence_get()); + if (pkcs7_seq == nullptr || !pkcs7_seq->asn1_sequence_next()) { + return false; + } + + std::unique_ptr<asn1_context> signed_data_app(pkcs7_seq->asn1_constructed_get()); + if (signed_data_app == nullptr) { + return false; + } + + std::unique_ptr<asn1_context> signed_data_seq(signed_data_app->asn1_sequence_get()); + if (signed_data_seq == nullptr || !signed_data_seq->asn1_sequence_next() || + !signed_data_seq->asn1_sequence_next() || !signed_data_seq->asn1_sequence_next() || + !signed_data_seq->asn1_constructed_skip_all()) { + return false; + } + + std::unique_ptr<asn1_context> sig_set(signed_data_seq->asn1_set_get()); + if (sig_set == nullptr) { + return false; + } + + std::unique_ptr<asn1_context> sig_seq(sig_set->asn1_sequence_get()); + if (sig_seq == nullptr || !sig_seq->asn1_sequence_next() || !sig_seq->asn1_sequence_next() || + !sig_seq->asn1_sequence_next() || !sig_seq->asn1_sequence_next()) { + return false; + } + + const uint8_t* sig_der_ptr; + size_t sig_der_length; + if (!sig_seq->asn1_octet_string_get(&sig_der_ptr, &sig_der_length)) { + return false; + } + + sig_der->resize(sig_der_length); + std::copy(sig_der_ptr, sig_der_ptr + sig_der_length, sig_der->begin()); + return true; +} + +int verify_file(VerifierInterface* package, const std::vector<Certificate>& keys) { + CHECK(package); + package->SetProgress(0.0); + + // An archive with a whole-file signature will end in six bytes: + // + // (2-byte signature start) $ff $ff (2-byte comment size) + // + // (As far as the ZIP format is concerned, these are part of the archive comment.) We start by + // reading this footer, this tells us how far back from the end we have to start reading to find + // the whole comment. + +#define FOOTER_SIZE 6 + uint64_t length = package->GetPackageSize(); + + if (length < FOOTER_SIZE) { + LOG(ERROR) << "not big enough to contain footer"; + return VERIFY_FAILURE; + } + + uint8_t footer[FOOTER_SIZE]; + if (!package->ReadFullyAtOffset(footer, FOOTER_SIZE, length - FOOTER_SIZE)) { + LOG(ERROR) << "Failed to read footer"; + return VERIFY_FAILURE; + } + + if (footer[2] != 0xff || footer[3] != 0xff) { + LOG(ERROR) << "footer is wrong"; + return VERIFY_FAILURE; + } + + size_t comment_size = footer[4] + (footer[5] << 8); + size_t signature_start = footer[0] + (footer[1] << 8); + LOG(INFO) << "comment is " << comment_size << " bytes; signature is " << signature_start + << " bytes from end"; + + if (signature_start > comment_size) { + LOG(ERROR) << "signature start: " << signature_start + << " is larger than comment size: " << comment_size; + return VERIFY_FAILURE; + } + + if (signature_start <= FOOTER_SIZE) { + LOG(ERROR) << "Signature start is in the footer"; + return VERIFY_FAILURE; + } + +#define EOCD_HEADER_SIZE 22 + + // The end-of-central-directory record is 22 bytes plus any comment length. + size_t eocd_size = comment_size + EOCD_HEADER_SIZE; + + if (length < eocd_size) { + LOG(ERROR) << "not big enough to contain EOCD"; + return VERIFY_FAILURE; + } + + // Determine how much of the file is covered by the signature. This is everything except the + // signature data and length, which includes all of the EOCD except for the comment length field + // (2 bytes) and the comment data. + uint64_t signed_len = length - eocd_size + EOCD_HEADER_SIZE - 2; + + uint8_t eocd[eocd_size]; + if (!package->ReadFullyAtOffset(eocd, eocd_size, length - eocd_size)) { + LOG(ERROR) << "Failed to read EOCD of " << eocd_size << " bytes"; + return VERIFY_FAILURE; + } + + // If this is really is the EOCD record, it will begin with the magic number $50 $4b $05 $06. + if (eocd[0] != 0x50 || eocd[1] != 0x4b || eocd[2] != 0x05 || eocd[3] != 0x06) { + LOG(ERROR) << "signature length doesn't match EOCD marker"; + return VERIFY_FAILURE; + } + + for (size_t i = 4; i < eocd_size - 3; ++i) { + if (eocd[i] == 0x50 && eocd[i + 1] == 0x4b && eocd[i + 2] == 0x05 && eocd[i + 3] == 0x06) { + // If the sequence $50 $4b $05 $06 appears anywhere after the real one, libziparchive will + // find the later (wrong) one, which could be exploitable. Fail the verification if this + // sequence occurs anywhere after the real one. + LOG(ERROR) << "EOCD marker occurs after start of EOCD"; + return VERIFY_FAILURE; + } + } + + bool need_sha1 = false; + bool need_sha256 = false; + for (const auto& key : keys) { + switch (key.hash_len) { + case SHA_DIGEST_LENGTH: + need_sha1 = true; + break; + case SHA256_DIGEST_LENGTH: + need_sha256 = true; + break; + } + } + + SHA_CTX sha1_ctx; + SHA256_CTX sha256_ctx; + SHA1_Init(&sha1_ctx); + SHA256_Init(&sha256_ctx); + + std::vector<HasherUpdateCallback> hashers; + if (need_sha1) { + hashers.emplace_back( + std::bind(&SHA1_Update, &sha1_ctx, std::placeholders::_1, std::placeholders::_2)); + } + if (need_sha256) { + hashers.emplace_back( + std::bind(&SHA256_Update, &sha256_ctx, std::placeholders::_1, std::placeholders::_2)); + } + + double frac = -1.0; + uint64_t so_far = 0; + while (so_far < signed_len) { + // On a Nexus 5X, experiment showed 16MiB beat 1MiB by 6% faster for a 1196MiB full OTA and + // 60% for an 89MiB incremental OTA. http://b/28135231. + uint64_t read_size = std::min<uint64_t>(signed_len - so_far, 16 * MiB); + package->UpdateHashAtOffset(hashers, so_far, read_size); + so_far += read_size; + + double f = so_far / static_cast<double>(signed_len); + if (f > frac + 0.02 || read_size == so_far) { + package->SetProgress(f); + frac = f; + } + } + + uint8_t sha1[SHA_DIGEST_LENGTH]; + SHA1_Final(sha1, &sha1_ctx); + uint8_t sha256[SHA256_DIGEST_LENGTH]; + SHA256_Final(sha256, &sha256_ctx); + + const uint8_t* signature = eocd + eocd_size - signature_start; + size_t signature_size = signature_start - FOOTER_SIZE; + + LOG(INFO) << "signature (offset: " << std::hex << (length - signature_start) + << ", length: " << signature_size << "): " << print_hex(signature, signature_size); + + std::vector<uint8_t> sig_der; + if (!read_pkcs7(signature, signature_size, &sig_der)) { + LOG(ERROR) << "Could not find signature DER block"; + return VERIFY_FAILURE; + } + + // Check to make sure at least one of the keys matches the signature. Since any key can match, + // we need to try each before determining a verification failure has happened. + size_t i = 0; + for (const auto& key : keys) { + const uint8_t* hash; + int hash_nid; + switch (key.hash_len) { + case SHA_DIGEST_LENGTH: + hash = sha1; + hash_nid = NID_sha1; + break; + case SHA256_DIGEST_LENGTH: + hash = sha256; + hash_nid = NID_sha256; + break; + default: + continue; + } + + // The 6 bytes is the "(signature_start) $ff $ff (comment_size)" that the signing tool appends + // after the signature itself. + if (key.key_type == Certificate::KEY_TYPE_RSA) { + if (!RSA_verify(hash_nid, hash, key.hash_len, sig_der.data(), sig_der.size(), + key.rsa.get())) { + LOG(INFO) << "failed to verify against RSA key " << i; + continue; + } + + LOG(INFO) << "whole-file signature verified against RSA key " << i; + return VERIFY_SUCCESS; + } else if (key.key_type == Certificate::KEY_TYPE_EC && key.hash_len == SHA256_DIGEST_LENGTH) { + if (!ECDSA_verify(0, hash, key.hash_len, sig_der.data(), sig_der.size(), key.ec.get())) { + LOG(INFO) << "failed to verify against EC key " << i; + continue; + } + + LOG(INFO) << "whole-file signature verified against EC key " << i; + return VERIFY_SUCCESS; + } else { + LOG(INFO) << "Unknown key type " << key.key_type; + } + i++; + } + + if (need_sha1) { + LOG(INFO) << "SHA-1 digest: " << print_hex(sha1, SHA_DIGEST_LENGTH); + } + if (need_sha256) { + LOG(INFO) << "SHA-256 digest: " << print_hex(sha256, SHA256_DIGEST_LENGTH); + } + LOG(ERROR) << "failed to verify whole-file signature"; + return VERIFY_FAILURE; +} + +static std::vector<Certificate> IterateZipEntriesAndSearchForKeys(const ZipArchiveHandle& handle) { + void* cookie; + ZipString suffix("x509.pem"); + int32_t iter_status = StartIteration(handle, &cookie, nullptr, &suffix); + if (iter_status != 0) { + LOG(ERROR) << "Failed to iterate over entries in the certificate zipfile: " + << ErrorCodeString(iter_status); + return {}; + } + + std::vector<Certificate> result; + + ZipString name; + ZipEntry entry; + while ((iter_status = Next(cookie, &entry, &name)) == 0) { + std::vector<uint8_t> pem_content(entry.uncompressed_length); + if (int32_t extract_status = + ExtractToMemory(handle, &entry, pem_content.data(), pem_content.size()); + extract_status != 0) { + LOG(ERROR) << "Failed to extract " << std::string(name.name, name.name + name.name_length); + return {}; + } + + Certificate cert(0, Certificate::KEY_TYPE_RSA, nullptr, nullptr); + // Aborts the parsing if we fail to load one of the key file. + if (!LoadCertificateFromBuffer(pem_content, &cert)) { + LOG(ERROR) << "Failed to load keys from " + << std::string(name.name, name.name + name.name_length); + return {}; + } + + result.emplace_back(std::move(cert)); + } + + if (iter_status != -1) { + LOG(ERROR) << "Error while iterating over zip entries: " << ErrorCodeString(iter_status); + return {}; + } + + return result; +} + +std::vector<Certificate> LoadKeysFromZipfile(const std::string& zip_name) { + ZipArchiveHandle handle; + if (int32_t open_status = OpenArchive(zip_name.c_str(), &handle); open_status != 0) { + LOG(ERROR) << "Failed to open " << zip_name << ": " << ErrorCodeString(open_status); + return {}; + } + + std::vector<Certificate> result = IterateZipEntriesAndSearchForKeys(handle); + CloseArchive(handle); + return result; +} + +bool CheckRSAKey(const std::unique_ptr<RSA, RSADeleter>& rsa) { + if (!rsa) { + return false; + } + + const BIGNUM* out_n; + const BIGNUM* out_e; + RSA_get0_key(rsa.get(), &out_n, &out_e, nullptr /* private exponent */); + auto modulus_bits = BN_num_bits(out_n); + if (modulus_bits != 2048 && modulus_bits != 4096) { + LOG(ERROR) << "Modulus should be 2048 or 4096 bits long, actual: " << modulus_bits; + return false; + } + + BN_ULONG exponent = BN_get_word(out_e); + if (exponent != 3 && exponent != 65537) { + LOG(ERROR) << "Public exponent should be 3 or 65537, actual: " << exponent; + return false; + } + + return true; +} + +bool CheckECKey(const std::unique_ptr<EC_KEY, ECKEYDeleter>& ec_key) { + if (!ec_key) { + return false; + } + + const EC_GROUP* ec_group = EC_KEY_get0_group(ec_key.get()); + if (!ec_group) { + LOG(ERROR) << "Failed to get the ec_group from the ec_key"; + return false; + } + auto degree = EC_GROUP_get_degree(ec_group); + if (degree != 256) { + LOG(ERROR) << "Field size of the ec key should be 256 bits long, actual: " << degree; + return false; + } + + return true; +} + +bool LoadCertificateFromBuffer(const std::vector<uint8_t>& pem_content, Certificate* cert) { + std::unique_ptr<BIO, decltype(&BIO_free)> content( + BIO_new_mem_buf(pem_content.data(), pem_content.size()), BIO_free); + + std::unique_ptr<X509, decltype(&X509_free)> x509( + PEM_read_bio_X509(content.get(), nullptr, nullptr, nullptr), X509_free); + if (!x509) { + LOG(ERROR) << "Failed to read x509 certificate"; + return false; + } + + int nid = X509_get_signature_nid(x509.get()); + switch (nid) { + // SignApk has historically accepted md5WithRSA certificates, but treated them as + // sha1WithRSA anyway. Continue to do so for backwards compatibility. + case NID_md5WithRSA: + case NID_md5WithRSAEncryption: + case NID_sha1WithRSA: + case NID_sha1WithRSAEncryption: + cert->hash_len = SHA_DIGEST_LENGTH; + break; + case NID_sha256WithRSAEncryption: + case NID_ecdsa_with_SHA256: + cert->hash_len = SHA256_DIGEST_LENGTH; + break; + default: + LOG(ERROR) << "Unrecognized signature nid " << OBJ_nid2ln(nid); + return false; + } + + std::unique_ptr<EVP_PKEY, decltype(&EVP_PKEY_free)> public_key(X509_get_pubkey(x509.get()), + EVP_PKEY_free); + if (!public_key) { + LOG(ERROR) << "Failed to extract the public key from x509 certificate"; + return false; + } + + int key_type = EVP_PKEY_id(public_key.get()); + if (key_type == EVP_PKEY_RSA) { + cert->key_type = Certificate::KEY_TYPE_RSA; + cert->ec.reset(); + cert->rsa.reset(EVP_PKEY_get1_RSA(public_key.get())); + if (!cert->rsa || !CheckRSAKey(cert->rsa)) { + LOG(ERROR) << "Failed to validate the rsa key info from public key"; + return false; + } + } else if (key_type == EVP_PKEY_EC) { + cert->key_type = Certificate::KEY_TYPE_EC; + cert->rsa.reset(); + cert->ec.reset(EVP_PKEY_get1_EC_KEY(public_key.get())); + if (!cert->ec || !CheckECKey(cert->ec)) { + LOG(ERROR) << "Failed to validate the ec key info from the public key"; + return false; + } + } else { + LOG(ERROR) << "Unrecognized public key type " << OBJ_nid2ln(key_type); + return false; + } + + return true; +} |