1/*
2 * Copyright (C) 2007 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *      http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17#include <ctype.h>
18#include <errno.h>
19#include <fcntl.h>
20#include <limits.h>
21#include <sys/stat.h>
22#include <sys/wait.h>
23#include <unistd.h>
24
25#include "common.h"
26#include "install.h"
27#include "mincrypt/rsa.h"
28#include "minui/minui.h"
29#include "minzip/SysUtil.h"
30#include "minzip/Zip.h"
31#include "mtdutils/mounts.h"
32#include "mtdutils/mtdutils.h"
33#include "roots.h"
34#include "verifier.h"
35#include "ui.h"
36
37extern RecoveryUI* ui;
38
39#define ASSUMED_UPDATE_BINARY_NAME  "META-INF/com/google/android/update-binary"
40#define PUBLIC_KEYS_FILE "/res/keys"
41
42// Default allocation of progress bar segments to operations
43static const int VERIFICATION_PROGRESS_TIME = 60;
44static const float VERIFICATION_PROGRESS_FRACTION = 0.25;
45static const float DEFAULT_FILES_PROGRESS_FRACTION = 0.4;
46static const float DEFAULT_IMAGE_PROGRESS_FRACTION = 0.1;
47
48// If the package contains an update binary, extract it and run it.
49static int
50try_update_binary(const char *path, ZipArchive *zip, int* wipe_cache) {
51    const ZipEntry* binary_entry =
52            mzFindZipEntry(zip, ASSUMED_UPDATE_BINARY_NAME);
53    if (binary_entry == NULL) {
54        mzCloseZipArchive(zip);
55        return INSTALL_CORRUPT;
56    }
57
58    const char* binary = "/tmp/update_binary";
59    unlink(binary);
60    int fd = creat(binary, 0755);
61    if (fd < 0) {
62        mzCloseZipArchive(zip);
63        LOGE("Can't make %s\n", binary);
64        return INSTALL_ERROR;
65    }
66    bool ok = mzExtractZipEntryToFile(zip, binary_entry, fd);
67    close(fd);
68    mzCloseZipArchive(zip);
69
70    if (!ok) {
71        LOGE("Can't copy %s\n", ASSUMED_UPDATE_BINARY_NAME);
72        return INSTALL_ERROR;
73    }
74
75    int pipefd[2];
76    pipe(pipefd);
77
78    // When executing the update binary contained in the package, the
79    // arguments passed are:
80    //
81    //   - the version number for this interface
82    //
83    //   - an fd to which the program can write in order to update the
84    //     progress bar.  The program can write single-line commands:
85    //
86    //        progress <frac> <secs>
87    //            fill up the next <frac> part of of the progress bar
88    //            over <secs> seconds.  If <secs> is zero, use
89    //            set_progress commands to manually control the
90    //            progress of this segment of the bar
91    //
92    //        set_progress <frac>
93    //            <frac> should be between 0.0 and 1.0; sets the
94    //            progress bar within the segment defined by the most
95    //            recent progress command.
96    //
97    //        firmware <"hboot"|"radio"> <filename>
98    //            arrange to install the contents of <filename> in the
99    //            given partition on reboot.
100    //
101    //            (API v2: <filename> may start with "PACKAGE:" to
102    //            indicate taking a file from the OTA package.)
103    //
104    //            (API v3: this command no longer exists.)
105    //
106    //        ui_print <string>
107    //            display <string> on the screen.
108    //
109    //   - the name of the package zip file.
110    //
111
112    const char** args = (const char**)malloc(sizeof(char*) * 5);
113    args[0] = binary;
114    args[1] = EXPAND(RECOVERY_API_VERSION);   // defined in Android.mk
115    char* temp = (char*)malloc(10);
116    sprintf(temp, "%d", pipefd[1]);
117    args[2] = temp;
118    args[3] = (char*)path;
119    args[4] = NULL;
120
121    pid_t pid = fork();
122    if (pid == 0) {
123        umask(022);
124        close(pipefd[0]);
125        execv(binary, (char* const*)args);
126        fprintf(stdout, "E:Can't run %s (%s)\n", binary, strerror(errno));
127        _exit(-1);
128    }
129    close(pipefd[1]);
130
131    *wipe_cache = 0;
132
133    char buffer[1024];
134    FILE* from_child = fdopen(pipefd[0], "r");
135    while (fgets(buffer, sizeof(buffer), from_child) != NULL) {
136        char* command = strtok(buffer, " \n");
137        if (command == NULL) {
138            continue;
139        } else if (strcmp(command, "progress") == 0) {
140            char* fraction_s = strtok(NULL, " \n");
141            char* seconds_s = strtok(NULL, " \n");
142
143            float fraction = strtof(fraction_s, NULL);
144            int seconds = strtol(seconds_s, NULL, 10);
145
146            ui->ShowProgress(fraction * (1-VERIFICATION_PROGRESS_FRACTION), seconds);
147        } else if (strcmp(command, "set_progress") == 0) {
148            char* fraction_s = strtok(NULL, " \n");
149            float fraction = strtof(fraction_s, NULL);
150            ui->SetProgress(fraction);
151        } else if (strcmp(command, "ui_print") == 0) {
152            char* str = strtok(NULL, "\n");
153            if (str) {
154                ui->Print("%s", str);
155            } else {
156                ui->Print("\n");
157            }
158            fflush(stdout);
159        } else if (strcmp(command, "wipe_cache") == 0) {
160            *wipe_cache = 1;
161        } else if (strcmp(command, "clear_display") == 0) {
162            ui->SetBackground(RecoveryUI::NONE);
163        } else if (strcmp(command, "enable_reboot") == 0) {
164            // packages can explicitly request that they want the user
165            // to be able to reboot during installation (useful for
166            // debugging packages that don't exit).
167            ui->SetEnableReboot(true);
168        } else {
169            LOGE("unknown command [%s]\n", command);
170        }
171    }
172    fclose(from_child);
173
174    int status;
175    waitpid(pid, &status, 0);
176    if (!WIFEXITED(status) || WEXITSTATUS(status) != 0) {
177        LOGE("Error in %s\n(Status %d)\n", path, WEXITSTATUS(status));
178        return INSTALL_ERROR;
179    }
180
181    return INSTALL_SUCCESS;
182}
183
184static int
185really_install_package(const char *path, int* wipe_cache, bool needs_mount)
186{
187    ui->SetBackground(RecoveryUI::INSTALLING_UPDATE);
188    ui->Print("Finding update package...\n");
189    // Give verification half the progress bar...
190    ui->SetProgressType(RecoveryUI::DETERMINATE);
191    ui->ShowProgress(VERIFICATION_PROGRESS_FRACTION, VERIFICATION_PROGRESS_TIME);
192    LOGI("Update location: %s\n", path);
193
194    // Map the update package into memory.
195    ui->Print("Opening update package...\n");
196
197    if (path && needs_mount) {
198        if (path[0] == '@') {
199            ensure_path_mounted(path+1);
200        } else {
201            ensure_path_mounted(path);
202        }
203    }
204
205    MemMapping map;
206    if (sysMapFile(path, &map) != 0) {
207        LOGE("failed to map file\n");
208        return INSTALL_CORRUPT;
209    }
210
211    int numKeys;
212    Certificate* loadedKeys = load_keys(PUBLIC_KEYS_FILE, &numKeys);
213    if (loadedKeys == NULL) {
214        LOGE("Failed to load keys\n");
215        return INSTALL_CORRUPT;
216    }
217    LOGI("%d key(s) loaded from %s\n", numKeys, PUBLIC_KEYS_FILE);
218
219    ui->Print("Verifying update package...\n");
220
221    int err;
222    err = verify_file(map.addr, map.length, loadedKeys, numKeys);
223    free(loadedKeys);
224    LOGI("verify_file returned %d\n", err);
225    if (err != VERIFY_SUCCESS) {
226        LOGE("signature verification failed\n");
227        sysReleaseMap(&map);
228        return INSTALL_CORRUPT;
229    }
230
231    /* Try to open the package.
232     */
233    ZipArchive zip;
234    err = mzOpenZipArchive(map.addr, map.length, &zip);
235    if (err != 0) {
236        LOGE("Can't open %s\n(%s)\n", path, err != -1 ? strerror(err) : "bad");
237        sysReleaseMap(&map);
238        return INSTALL_CORRUPT;
239    }
240
241    /* Verify and install the contents of the package.
242     */
243    ui->Print("Installing update...\n");
244    ui->SetEnableReboot(false);
245    int result = try_update_binary(path, &zip, wipe_cache);
246    ui->SetEnableReboot(true);
247    ui->Print("\n");
248
249    sysReleaseMap(&map);
250
251    return result;
252}
253
254int
255install_package(const char* path, int* wipe_cache, const char* install_file,
256                bool needs_mount)
257{
258    FILE* install_log = fopen_path(install_file, "w");
259    if (install_log) {
260        fputs(path, install_log);
261        fputc('\n', install_log);
262    } else {
263        LOGE("failed to open last_install: %s\n", strerror(errno));
264    }
265    int result;
266    if (setup_install_mounts() != 0) {
267        LOGE("failed to set up expected mounts for install; aborting\n");
268        result = INSTALL_ERROR;
269    } else {
270        result = really_install_package(path, wipe_cache, needs_mount);
271    }
272    if (install_log) {
273        fputc(result == INSTALL_SUCCESS ? '1' : '0', install_log);
274        fputc('\n', install_log);
275        fclose(install_log);
276    }
277    return result;
278}
279