install.c - android_bootable_recovery - Gitiles

 /*
  * 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 <ctype.h>
 #include <errno.h>
 #include <fcntl.h>
 #include <limits.h>
 #include <sys/stat.h>
 #include <sys/wait.h>
 #include <unistd.h>

 #include "common.h"
 #include "install.h"
 #include "mincrypt/rsa.h"
 #include "minui/minui.h"
 #include "minzip/SysUtil.h"
 #include "minzip/Zip.h"
 #include "mtdutils/mounts.h"
 #include "mtdutils/mtdutils.h"
 #include "roots.h"
 #include "verifier.h"

 #define ASSUMED_UPDATE_BINARY_NAME  "META-INF/com/google/android/update-binary"
 #define PUBLIC_KEYS_FILE "/res/keys"

 // If the package contains an update binary, extract it and run it.
 static int
 try_update_binary(const char *path, ZipArchive *zip) {
     const ZipEntry* binary_entry =
             mzFindZipEntry(zip, ASSUMED_UPDATE_BINARY_NAME);
     if (binary_entry == NULL) {
         mzCloseZipArchive(zip);
         return INSTALL_CORRUPT;
     }

     char* binary = "/tmp/update_binary";
     unlink(binary);
     int fd = creat(binary, 0755);
     if (fd < 0) {
         mzCloseZipArchive(zip);
         LOGE("Can't make %s\n", binary);
         return 1;
     }
     bool ok = mzExtractZipEntryToFile(zip, binary_entry, fd);
     close(fd);
     mzCloseZipArchive(zip);

     if (!ok) {
         LOGE("Can't copy %s\n", ASSUMED_UPDATE_BINARY_NAME);
         return 1;
     }

     int pipefd[2];
     pipe(pipefd);

     // 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 program can write single-line commands:
     //
     //        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.
     //
     //        firmware <"hboot"|"radio"> <filename>
     //            arrange to install the contents of <filename> in the
     //            given partition on reboot.
     //
     //            (API v2: <filename> may start with "PACKAGE:" to
     //            indicate taking a file from the OTA package.)
     //
     //            (API v3: this command no longer exists.)
     //
     //        ui_print <string>
     //            display <string> on the screen.
     //
     //   - the name of the package zip file.
     //

     char** args = malloc(sizeof(char*) * 5);
     args[0] = binary;
     args[1] = EXPAND(RECOVERY_API_VERSION);   // defined in Android.mk
     args[2] = malloc(10);
     sprintf(args[2], "%d", pipefd[1]);
     args[3] = (char*)path;
     args[4] = NULL;

     pid_t pid = fork();
     if (pid == 0) {
         close(pipefd[0]);
         execv(binary, args);
         fprintf(stderr, "E:Can't run %s (%s)\n", binary, strerror(errno));
         _exit(-1);
     }
     close(pipefd[1]);

     char buffer[1024];
     FILE* from_child = fdopen(pipefd[0], "r");
     while (fgets(buffer, sizeof(buffer), from_child) != NULL) {
         char* command = strtok(buffer, " \n");
         if (command == NULL) {
             continue;
         } else if (strcmp(command, "progress") == 0) {
             char* fraction_s = strtok(NULL, " \n");
             char* seconds_s = strtok(NULL, " \n");

             float fraction = strtof(fraction_s, NULL);
             int seconds = strtol(seconds_s, NULL, 10);

             ui_show_progress(fraction * (1-VERIFICATION_PROGRESS_FRACTION),
                              seconds);
         } else if (strcmp(command, "set_progress") == 0) {
             char* fraction_s = strtok(NULL, " \n");
             float fraction = strtof(fraction_s, NULL);
             ui_set_progress(fraction);
         } else if (strcmp(command, "ui_print") == 0) {
             char* str = strtok(NULL, "\n");
             if (str) {
                 ui_print("%s", str);
             } else {
                 ui_print("\n");
             }
         } else {
             LOGE("unknown command [%s]\n", command);
         }
     }
     fclose(from_child);

     int status;
     waitpid(pid, &status, 0);
     if (!WIFEXITED(status) || WEXITSTATUS(status) != 0) {
         LOGE("Error in %s\n(Status %d)\n", path, WEXITSTATUS(status));
         return INSTALL_ERROR;
     }

     return INSTALL_SUCCESS;
 }

 static int
 handle_update_package(const char *path, ZipArchive *zip)
 {
     // Update should take the rest of the progress bar.
     ui_print("Installing update...\n");

     int result = try_update_binary(path, zip);
     register_package_root(NULL, NULL);  // Unregister package root
     return result;
 }

 // Reads a file containing one or more public keys as produced by
 // DumpPublicKey:  this is an RSAPublicKey struct as it would appear
 // as a C source literal, eg:
 //
 //  "{64,0xc926ad21,{1795090719,...,-695002876},{-857949815,...,1175080310}}"
 //
 // (Note that the braces and commas in this example are actual
 // characters the parser expects to find in the file; the ellipses
 // indicate more numbers omitted from this example.)
 //
 // The file may contain multiple keys in this format, separated by
 // commas.  The last key must not be followed by a comma.
 //
 // Returns NULL if the file failed to parse, or if it contain zero keys.
 static RSAPublicKey*
 load_keys(const char* filename, int* numKeys) {
     RSAPublicKey* out = NULL;
     *numKeys = 0;

     FILE* f = fopen(filename, "r");
     if (f == NULL) {
         LOGE("opening %s: %s\n", filename, strerror(errno));
         goto exit;
     }

     int i;
     bool done = false;
     while (!done) {
         ++*numKeys;
         out = realloc(out, *numKeys * sizeof(RSAPublicKey));
         RSAPublicKey* key = out + (*numKeys - 1);
         if (fscanf(f, " { %i , 0x%x , { %u",
                    &(key->len), &(key->n0inv), &(key->n[0])) != 3) {
             goto exit;
         }
         if (key->len != RSANUMWORDS) {
             LOGE("key length (%d) does not match expected size\n", key->len);
             goto exit;
         }
         for (i = 1; i < key->len; ++i) {
             if (fscanf(f, " , %u", &(key->n[i])) != 1) goto exit;
         }
         if (fscanf(f, " } , { %u", &(key->rr[0])) != 1) goto exit;
         for (i = 1; i < key->len; ++i) {
             if (fscanf(f, " , %u", &(key->rr[i])) != 1) goto exit;
         }
         fscanf(f, " } } ");

         // if the line ends in a comma, this file has more keys.
         switch (fgetc(f)) {
             case ',':
                 // more keys to come.
                 break;

             case EOF:
                 done = true;
                 break;

             default:
                 LOGE("unexpected character between keys\n");
                 goto exit;
         }
     }

     fclose(f);
     return out;

 exit:
     if (f) fclose(f);
     free(out);
     *numKeys = 0;
     return NULL;
 }

 int
 install_package(const char *root_path)
 {
     ui_set_background(BACKGROUND_ICON_INSTALLING);
     ui_print("Finding update package...\n");
     ui_show_indeterminate_progress();
     LOGI("Update location: %s\n", root_path);

     if (ensure_root_path_mounted(root_path) != 0) {
         LOGE("Can't mount %s\n", root_path);
         return INSTALL_CORRUPT;
     }

     char path[PATH_MAX] = "";
     if (translate_root_path(root_path, path, sizeof(path)) == NULL) {
         LOGE("Bad path %s\n", root_path);
         return INSTALL_CORRUPT;
     }

     ui_print("Opening update package...\n");
     LOGI("Update file path: %s\n", path);

     int numKeys;
     RSAPublicKey* loadedKeys = load_keys(PUBLIC_KEYS_FILE, &numKeys);
     if (loadedKeys == NULL) {
         LOGE("Failed to load keys\n");
         return INSTALL_CORRUPT;
     }
     LOGI("%d key(s) loaded from %s\n", numKeys, PUBLIC_KEYS_FILE);

     // Give verification half the progress bar...
     ui_print("Verifying update package...\n");
     ui_show_progress(
             VERIFICATION_PROGRESS_FRACTION,
             VERIFICATION_PROGRESS_TIME);

     int err;
     err = verify_file(path, loadedKeys, numKeys);
     free(loadedKeys);
     LOGI("verify_file returned %d\n", err);
     if (err != VERIFY_SUCCESS) {
         LOGE("signature verification failed\n");
         return INSTALL_CORRUPT;
     }

     /* Try to open the package.
      */
     ZipArchive zip;
     err = mzOpenZipArchive(path, &zip);
     if (err != 0) {
         LOGE("Can't open %s\n(%s)\n", path, err != -1 ? strerror(err) : "bad");
         return INSTALL_CORRUPT;
     }

     /* Verify and install the contents of the package.
      */
     int status = handle_update_package(path, &zip);
     return status;
 }
	/*
	* 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 <ctype.h>
	#include <errno.h>
	#include <fcntl.h>
	#include <limits.h>
	#include <sys/stat.h>
	#include <sys/wait.h>
	#include <unistd.h>

	#include "common.h"
	#include "install.h"
	#include "mincrypt/rsa.h"
	#include "minui/minui.h"
	#include "minzip/SysUtil.h"
	#include "minzip/Zip.h"
	#include "mtdutils/mounts.h"
	#include "mtdutils/mtdutils.h"
	#include "roots.h"
	#include "verifier.h"

	#define ASSUMED_UPDATE_BINARY_NAME "META-INF/com/google/android/update-binary"
	#define PUBLIC_KEYS_FILE "/res/keys"

	// If the package contains an update binary, extract it and run it.
	static int
	try_update_binary(const char path, ZipArchive zip) {
	const ZipEntry* binary_entry =
	mzFindZipEntry(zip, ASSUMED_UPDATE_BINARY_NAME);
	if (binary_entry == NULL) {
	mzCloseZipArchive(zip);
	return INSTALL_CORRUPT;
	}

	char* binary = "/tmp/update_binary";
	unlink(binary);
	int fd = creat(binary, 0755);
	if (fd < 0) {
	mzCloseZipArchive(zip);
	LOGE("Can't make %s\n", binary);
	return 1;
	}
	bool ok = mzExtractZipEntryToFile(zip, binary_entry, fd);
	close(fd);
	mzCloseZipArchive(zip);

	if (!ok) {
	LOGE("Can't copy %s\n", ASSUMED_UPDATE_BINARY_NAME);
	return 1;
	}

	int pipefd[2];
	pipe(pipefd);

	// 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 program can write single-line commands:
	//
	// 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.
	//
	// firmware <"hboot"\|"radio"> <filename>
	// arrange to install the contents of <filename> in the
	// given partition on reboot.
	//
	// (API v2: <filename> may start with "PACKAGE:" to
	// indicate taking a file from the OTA package.)
	//
	// (API v3: this command no longer exists.)
	//
	// ui_print <string>
	// display <string> on the screen.
	//
	// - the name of the package zip file.
	//

	char** args = malloc(sizeof(char) 5);
	args[0] = binary;
	args[1] = EXPAND(RECOVERY_API_VERSION); // defined in Android.mk
	args[2] = malloc(10);
	sprintf(args[2], "%d", pipefd[1]);
	args[3] = (char*)path;
	args[4] = NULL;

	pid_t pid = fork();
	if (pid == 0) {
	close(pipefd[0]);
	execv(binary, args);
	fprintf(stderr, "E:Can't run %s (%s)\n", binary, strerror(errno));
	_exit(-1);
	}
	close(pipefd[1]);

	char buffer[1024];
	FILE* from_child = fdopen(pipefd[0], "r");
	while (fgets(buffer, sizeof(buffer), from_child) != NULL) {
	char* command = strtok(buffer, " \n");
	if (command == NULL) {
	continue;
	} else if (strcmp(command, "progress") == 0) {
	char* fraction_s = strtok(NULL, " \n");
	char* seconds_s = strtok(NULL, " \n");

	float fraction = strtof(fraction_s, NULL);
	int seconds = strtol(seconds_s, NULL, 10);

	ui_show_progress(fraction * (1-VERIFICATION_PROGRESS_FRACTION),
	seconds);
	} else if (strcmp(command, "set_progress") == 0) {
	char* fraction_s = strtok(NULL, " \n");
	float fraction = strtof(fraction_s, NULL);
	ui_set_progress(fraction);
	} else if (strcmp(command, "ui_print") == 0) {
	char* str = strtok(NULL, "\n");
	if (str) {
	ui_print("%s", str);
	} else {
	ui_print("\n");
	}
	} else {
	LOGE("unknown command [%s]\n", command);
	}
	}
	fclose(from_child);

	int status;
	waitpid(pid, &status, 0);
	if (!WIFEXITED(status) \|\| WEXITSTATUS(status) != 0) {
	LOGE("Error in %s\n(Status %d)\n", path, WEXITSTATUS(status));
	return INSTALL_ERROR;
	}

	return INSTALL_SUCCESS;
	}

	static int
	handle_update_package(const char path, ZipArchive zip)
	{
	// Update should take the rest of the progress bar.
	ui_print("Installing update...\n");

	int result = try_update_binary(path, zip);
	register_package_root(NULL, NULL); // Unregister package root
	return result;
	}

	// Reads a file containing one or more public keys as produced by
	// DumpPublicKey: this is an RSAPublicKey struct as it would appear
	// as a C source literal, eg:
	//
	// "{64,0xc926ad21,{1795090719,...,-695002876},{-857949815,...,1175080310}}"
	//
	// (Note that the braces and commas in this example are actual
	// characters the parser expects to find in the file; the ellipses
	// indicate more numbers omitted from this example.)
	//
	// The file may contain multiple keys in this format, separated by
	// commas. The last key must not be followed by a comma.
	//
	// Returns NULL if the file failed to parse, or if it contain zero keys.
	static RSAPublicKey*
	load_keys(const char* filename, int* numKeys) {
	RSAPublicKey* out = NULL;
	*numKeys = 0;

	FILE* f = fopen(filename, "r");
	if (f == NULL) {
	LOGE("opening %s: %s\n", filename, strerror(errno));
	goto exit;
	}

	int i;
	bool done = false;
	while (!done) {
	++*numKeys;
	out = realloc(out, numKeys sizeof(RSAPublicKey));
	RSAPublicKey* key = out + (*numKeys - 1);
	if (fscanf(f, " { %i , 0x%x , { %u",
	&(key->len), &(key->n0inv), &(key->n[0])) != 3) {
	goto exit;
	}
	if (key->len != RSANUMWORDS) {
	LOGE("key length (%d) does not match expected size\n", key->len);
	goto exit;
	}
	for (i = 1; i < key->len; ++i) {
	if (fscanf(f, " , %u", &(key->n[i])) != 1) goto exit;
	}
	if (fscanf(f, " } , { %u", &(key->rr[0])) != 1) goto exit;
	for (i = 1; i < key->len; ++i) {
	if (fscanf(f, " , %u", &(key->rr[i])) != 1) goto exit;
	}
	fscanf(f, " } } ");

	// if the line ends in a comma, this file has more keys.
	switch (fgetc(f)) {
	case ',':
	// more keys to come.
	break;

	case EOF:
	done = true;
	break;

	default:
	LOGE("unexpected character between keys\n");
	goto exit;
	}
	}

	fclose(f);
	return out;

	exit:
	if (f) fclose(f);
	free(out);
	*numKeys = 0;
	return NULL;
	}

	int
	install_package(const char *root_path)
	{
	ui_set_background(BACKGROUND_ICON_INSTALLING);
	ui_print("Finding update package...\n");
	ui_show_indeterminate_progress();
	LOGI("Update location: %s\n", root_path);

	if (ensure_root_path_mounted(root_path) != 0) {
	LOGE("Can't mount %s\n", root_path);
	return INSTALL_CORRUPT;
	}

	char path[PATH_MAX] = "";
	if (translate_root_path(root_path, path, sizeof(path)) == NULL) {
	LOGE("Bad path %s\n", root_path);
	return INSTALL_CORRUPT;
	}

	ui_print("Opening update package...\n");
	LOGI("Update file path: %s\n", path);

	int numKeys;
	RSAPublicKey* loadedKeys = load_keys(PUBLIC_KEYS_FILE, &numKeys);
	if (loadedKeys == NULL) {
	LOGE("Failed to load keys\n");
	return INSTALL_CORRUPT;
	}
	LOGI("%d key(s) loaded from %s\n", numKeys, PUBLIC_KEYS_FILE);

	// Give verification half the progress bar...
	ui_print("Verifying update package...\n");
	ui_show_progress(
	VERIFICATION_PROGRESS_FRACTION,
	VERIFICATION_PROGRESS_TIME);

	int err;
	err = verify_file(path, loadedKeys, numKeys);
	free(loadedKeys);
	LOGI("verify_file returned %d\n", err);
	if (err != VERIFY_SUCCESS) {
	LOGE("signature verification failed\n");
	return INSTALL_CORRUPT;
	}

	/* Try to open the package.
	*/
	ZipArchive zip;
	err = mzOpenZipArchive(path, &zip);
	if (err != 0) {
	LOGE("Can't open %s\n(%s)\n", path, err != -1 ? strerror(err) : "bad");
	return INSTALL_CORRUPT;
	}

	/* Verify and install the contents of the package.
	*/
	int status = handle_update_package(path, &zip);
	return status;
	}