1 files changed, 500 insertions, 0 deletions

diff --git a/toolkit/mozapps/update/updater/launchchild_osx.mm b/toolkit/mozapps/update/updater/launchchild_osx.mm
new file mode 100644
index 0000000000..3d28a064c7
--- /dev/null
+++ b/toolkit/mozapps/update/updater/launchchild_osx.mm
@@ -0,0 +1,500 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim:set ts=2 sw=2 sts=2 et cindent: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include <Cocoa/Cocoa.h>
+#include <CoreServices/CoreServices.h>
+#include <crt_externs.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include <spawn.h>
+#include <SystemConfiguration/SystemConfiguration.h>
+#include <sys/types.h>
+#include <sys/sysctl.h>
+#include "readstrings.h"
+
+#define ARCH_PATH "/usr/bin/arch"
+#if defined(__x86_64__)
+// Work around the fact that this constant is not available in the macOS SDK
+#  define kCFBundleExecutableArchitectureARM64 0x0100000c
+#endif
+
+class MacAutoreleasePool {
+ public:
+  MacAutoreleasePool() { mPool = [[NSAutoreleasePool alloc] init]; }
+  ~MacAutoreleasePool() { [mPool release]; }
+
+ private:
+  NSAutoreleasePool* mPool;
+};
+
+#if defined(__x86_64__)
+/*
+ * Returns true if the process is running under Rosetta translation. Returns
+ * false if running natively or if an error was encountered. We use the
+ * `sysctl.proc_translated` sysctl which is documented by Apple to be used
+ * for this purpose.
+ */
+bool IsProcessRosettaTranslated() {
+  int ret = 0;
+  size_t size = sizeof(ret);
+  if (sysctlbyname("sysctl.proc_translated", &ret, &size, NULL, 0) == -1) {
+    if (errno != ENOENT) {
+      fprintf(stderr, "Failed to check for translation environment\n");
+    }
+    return false;
+  }
+  return (ret == 1);
+}
+
+// Returns true if the binary at |executablePath| can be executed natively
+// on an arm64 Mac. Returns false otherwise or if an error occurred.
+bool IsBinaryArmExecutable(const char* executablePath) {
+  bool isArmExecutable = false;
+
+  CFURLRef url = ::CFURLCreateFromFileSystemRepresentation(
+      kCFAllocatorDefault, (const UInt8*)executablePath, strlen(executablePath), false);
+  if (!url) {
+    return false;
+  }
+
+  CFArrayRef archs = ::CFBundleCopyExecutableArchitecturesForURL(url);
+  if (!archs) {
+    CFRelease(url);
+    return false;
+  }
+
+  CFIndex archCount = ::CFArrayGetCount(archs);
+  for (CFIndex i = 0; i < archCount; i++) {
+    CFNumberRef currentArch = static_cast<CFNumberRef>(::CFArrayGetValueAtIndex(archs, i));
+    int currentArchInt = 0;
+    if (!::CFNumberGetValue(currentArch, kCFNumberIntType, &currentArchInt)) {
+      continue;
+    }
+    if (currentArchInt == kCFBundleExecutableArchitectureARM64) {
+      isArmExecutable = true;
+      break;
+    }
+  }
+
+  CFRelease(url);
+  CFRelease(archs);
+
+  return isArmExecutable;
+}
+
+// Returns true if the executable provided in |executablePath| should be
+// launched with a preference for arm64. After updating from an x64 version
+// running under Rosetta, if the update is to a universal binary with arm64
+// support we want to switch to arm64 execution mode. Returns true if those
+// conditions are met and the arch(1) utility at |archPath| is executable.
+// It should be safe to always launch with arch and fallback to x64, but we
+// limit its use to the only scenario it is necessary to minimize risk.
+bool ShouldPreferArmLaunch(const char* archPath, const char* executablePath) {
+  // If not running under Rosetta, we are not on arm64 hardware.
+  if (!IsProcessRosettaTranslated()) {
+    return false;
+  }
+
+  // Ensure the arch(1) utility is present and executable.
+  NSFileManager* fileMgr = [NSFileManager defaultManager];
+  NSString* archPathString = [NSString stringWithUTF8String:archPath];
+  if (![fileMgr isExecutableFileAtPath:archPathString]) {
+    return false;
+  }
+
+  // Ensure the binary can be run natively on arm64.
+  return IsBinaryArmExecutable(executablePath);
+}
+#endif  // __x86_64__
+
+void LaunchChild(int argc, const char** argv) {
+  MacAutoreleasePool pool;
+
+  @try {
+    bool preferArmLaunch = false;
+
+#if defined(__x86_64__)
+    // When running under Rosetta, child processes inherit the architecture
+    // preference of their parent and therefore universal binaries launched
+    // by an emulated x64 process will launch in x64 mode. If we are running
+    // under Rosetta, launch the child process with a preference for arm64 so
+    // that we will switch to arm64 execution if we have just updated from
+    // x64 to a universal build. This includes if we were already a universal
+    // build and the user is intentionally running under Rosetta.
+    preferArmLaunch = ShouldPreferArmLaunch(ARCH_PATH, argv[0]);
+#endif  // __x86_64__
+
+    NSString* launchPath;
+    NSMutableArray* arguments;
+
+    if (preferArmLaunch) {
+      launchPath = [NSString stringWithUTF8String:ARCH_PATH];
+
+      // Size the arguments array to include all the arguments
+      // in |argv| plus two arguments to pass to the arch(1) utility.
+      arguments = [NSMutableArray arrayWithCapacity:argc + 2];
+      [arguments addObject:[NSString stringWithUTF8String:"-arm64"]];
+      [arguments addObject:[NSString stringWithUTF8String:"-x86_64"]];
+
+      // Add the first argument from |argv|. The rest are added below.
+      [arguments addObject:[NSString stringWithUTF8String:argv[0]]];
+    } else {
+      launchPath = [NSString stringWithUTF8String:argv[0]];
+      arguments = [NSMutableArray arrayWithCapacity:argc - 1];
+    }
+
+    for (int i = 1; i < argc; i++) {
+      [arguments addObject:[NSString stringWithUTF8String:argv[i]]];
+    }
+    [NSTask launchedTaskWithLaunchPath:launchPath arguments:arguments];
+  } @catch (NSException* e) {
+    NSLog(@"%@: %@", e.name, e.reason);
+  }
+}
+
+void LaunchMacPostProcess(const char* aAppBundle) {
+  MacAutoreleasePool pool;
+
+  // Launch helper to perform post processing for the update; this is the Mac
+  // analogue of LaunchWinPostProcess (PostUpdateWin).
+  NSString* iniPath = [NSString stringWithUTF8String:aAppBundle];
+  iniPath = [iniPath stringByAppendingPathComponent:@"Contents/Resources/updater.ini"];
+
+  NSFileManager* fileManager = [NSFileManager defaultManager];
+  if (![fileManager fileExistsAtPath:iniPath]) {
+    // the file does not exist; there is nothing to run
+    return;
+  }
+
+  int readResult;
+  mozilla::UniquePtr<char[]> values[2];
+  readResult =
+      ReadStrings([iniPath UTF8String], "ExeRelPath\0ExeArg\0", 2, values, "PostUpdateMac");
+  if (readResult) {
+    return;
+  }
+
+  NSString* exeRelPath = [NSString stringWithUTF8String:values[0].get()];
+  NSString* exeArg = [NSString stringWithUTF8String:values[1].get()];
+  if (!exeArg || !exeRelPath) {
+    return;
+  }
+
+  // The path must not traverse directories and it must be a relative path.
+  if ([exeRelPath isEqualToString:@".."] || [exeRelPath hasPrefix:@"/"] ||
+      [exeRelPath hasPrefix:@"../"] || [exeRelPath hasSuffix:@"/.."] ||
+      [exeRelPath containsString:@"/../"]) {
+    return;
+  }
+
+  NSString* exeFullPath = [NSString stringWithUTF8String:aAppBundle];
+  exeFullPath = [exeFullPath stringByAppendingPathComponent:exeRelPath];
+
+  mozilla::UniquePtr<char[]> optVal;
+  readResult = ReadStrings([iniPath UTF8String], "ExeAsync\0", 1, &optVal, "PostUpdateMac");
+
+  NSTask* task = [[NSTask alloc] init];
+  [task setLaunchPath:exeFullPath];
+  [task setArguments:[NSArray arrayWithObject:exeArg]];
+  [task launch];
+  if (!readResult) {
+    NSString* exeAsync = [NSString stringWithUTF8String:optVal.get()];
+    if ([exeAsync isEqualToString:@"false"]) {
+      [task waitUntilExit];
+    }
+  }
+  // ignore the return value of the task, there's nothing we can do with it
+  [task release];
+}
+
+id ConnectToUpdateServer() {
+  MacAutoreleasePool pool;
+
+  id updateServer = nil;
+  BOOL isConnected = NO;
+  int currTry = 0;
+  const int numRetries = 10;  // Number of IPC connection retries before
+                              // giving up.
+  while (!isConnected && currTry < numRetries) {
+    @try {
+      updateServer = (id)[NSConnection
+          rootProxyForConnectionWithRegisteredName:@"org.mozilla.updater.server"
+                                              host:nil
+                                   usingNameServer:[NSSocketPortNameServer sharedInstance]];
+      if (!updateServer || ![updateServer respondsToSelector:@selector(abort)] ||
+          ![updateServer respondsToSelector:@selector(getArguments)] ||
+          ![updateServer respondsToSelector:@selector(shutdown)]) {
+        NSLog(@"Server doesn't exist or doesn't provide correct selectors.");
+        sleep(1);  // Wait 1 second.
+        currTry++;
+      } else {
+        isConnected = YES;
+      }
+    } @catch (NSException* e) {
+      NSLog(@"Encountered exception, retrying: %@: %@", e.name, e.reason);
+      sleep(1);  // Wait 1 second.
+      currTry++;
+    }
+  }
+  if (!isConnected) {
+    NSLog(@"Failed to connect to update server after several retries.");
+    return nil;
+  }
+  return updateServer;
+}
+
+void CleanupElevatedMacUpdate(bool aFailureOccurred) {
+  MacAutoreleasePool pool;
+
+  id updateServer = ConnectToUpdateServer();
+  if (updateServer) {
+    @try {
+      if (aFailureOccurred) {
+        [updateServer performSelector:@selector(abort)];
+      } else {
+        [updateServer performSelector:@selector(shutdown)];
+      }
+    } @catch (NSException* e) {
+    }
+  }
+
+  NSFileManager* manager = [NSFileManager defaultManager];
+  [manager removeItemAtPath:@"/Library/PrivilegedHelperTools/org.mozilla.updater" error:nil];
+  [manager removeItemAtPath:@"/Library/LaunchDaemons/org.mozilla.updater.plist" error:nil];
+  const char* launchctlArgs[] = {"/bin/launchctl", "remove", "org.mozilla.updater"};
+  // The following call will terminate the current process due to the "remove"
+  // argument in launchctlArgs.
+  LaunchChild(3, launchctlArgs);
+}
+
+// Note: Caller is responsible for freeing argv.
+bool ObtainUpdaterArguments(int* argc, char*** argv) {
+  MacAutoreleasePool pool;
+
+  id updateServer = ConnectToUpdateServer();
+  if (!updateServer) {
+    // Let's try our best and clean up.
+    CleanupElevatedMacUpdate(true);
+    return false;  // Won't actually get here due to CleanupElevatedMacUpdate.
+  }
+
+  @try {
+    NSArray* updaterArguments = [updateServer performSelector:@selector(getArguments)];
+    *argc = [updaterArguments count];
+    char** tempArgv = (char**)malloc(sizeof(char*) * (*argc));
+    for (int i = 0; i < *argc; i++) {
+      int argLen = [[updaterArguments objectAtIndex:i] length] + 1;
+      tempArgv[i] = (char*)malloc(argLen);
+      strncpy(tempArgv[i], [[updaterArguments objectAtIndex:i] UTF8String], argLen);
+    }
+    *argv = tempArgv;
+  } @catch (NSException* e) {
+    // Let's try our best and clean up.
+    CleanupElevatedMacUpdate(true);
+    return false;  // Won't actually get here due to CleanupElevatedMacUpdate.
+  }
+  return true;
+}
+
+/**
+ * The ElevatedUpdateServer is launched from a non-elevated updater process.
+ * It allows an elevated updater process (usually a privileged helper tool) to
+ * connect to it and receive all the necessary arguments to complete a
+ * successful update.
+ */
+@interface ElevatedUpdateServer : NSObject {
+  NSArray* mUpdaterArguments;
+  BOOL mShouldKeepRunning;
+  BOOL mAborted;
+}
+- (id)initWithArgs:(NSArray*)args;
+- (BOOL)runServer;
+- (NSArray*)getArguments;
+- (void)abort;
+- (BOOL)wasAborted;
+- (void)shutdown;
+- (BOOL)shouldKeepRunning;
+@end
+
+@implementation ElevatedUpdateServer
+
+- (id)initWithArgs:(NSArray*)args {
+  self = [super init];
+  if (!self) {
+    return nil;
+  }
+  mUpdaterArguments = args;
+  mShouldKeepRunning = YES;
+  mAborted = NO;
+  return self;
+}
+
+- (BOOL)runServer {
+  NSPort* serverPort = [NSSocketPort port];
+  NSConnection* server = [NSConnection connectionWithReceivePort:serverPort sendPort:serverPort];
+  [server setRootObject:self];
+  if ([server registerName:@"org.mozilla.updater.server"
+            withNameServer:[NSSocketPortNameServer sharedInstance]] == NO) {
+    NSLog(@"Unable to register as DirectoryServer.");
+    NSLog(@"Is another copy running?");
+    return NO;
+  }
+
+  while ([self shouldKeepRunning] && [[NSRunLoop currentRunLoop] runMode:NSDefaultRunLoopMode
+                                                              beforeDate:[NSDate distantFuture]])
+    ;
+  return ![self wasAborted];
+}
+
+- (NSArray*)getArguments {
+  return mUpdaterArguments;
+}
+
+- (void)abort {
+  mAborted = YES;
+  [self shutdown];
+}
+
+- (BOOL)wasAborted {
+  return mAborted;
+}
+
+- (void)shutdown {
+  mShouldKeepRunning = NO;
+}
+
+- (BOOL)shouldKeepRunning {
+  return mShouldKeepRunning;
+}
+
+@end
+
+bool ServeElevatedUpdate(int argc, const char** argv) {
+  MacAutoreleasePool pool;
+
+  NSMutableArray* updaterArguments = [NSMutableArray arrayWithCapacity:argc];
+  for (int i = 0; i < argc; i++) {
+    [updaterArguments addObject:[NSString stringWithUTF8String:argv[i]]];
+  }
+
+  ElevatedUpdateServer* updater =
+      [[ElevatedUpdateServer alloc] initWithArgs:[updaterArguments copy]];
+  bool didSucceed = [updater runServer];
+
+  [updater release];
+  return didSucceed;
+}
+
+bool IsOwnedByGroupAdmin(const char* aAppBundle) {
+  MacAutoreleasePool pool;
+
+  NSString* appDir = [NSString stringWithUTF8String:aAppBundle];
+  NSFileManager* fileManager = [NSFileManager defaultManager];
+
+  NSDictionary* attributes = [fileManager attributesOfItemAtPath:appDir error:nil];
+  bool isOwnedByAdmin = false;
+  if (attributes && [[attributes valueForKey:NSFileGroupOwnerAccountID] intValue] == 80) {
+    isOwnedByAdmin = true;
+  }
+  return isOwnedByAdmin;
+}
+
+void SetGroupOwnershipAndPermissions(const char* aAppBundle) {
+  MacAutoreleasePool pool;
+
+  NSString* appDir = [NSString stringWithUTF8String:aAppBundle];
+  NSFileManager* fileManager = [NSFileManager defaultManager];
+  NSError* error = nil;
+  NSArray* paths = [fileManager subpathsOfDirectoryAtPath:appDir error:&error];
+  if (error) {
+    return;
+  }
+
+  // Set group ownership of Firefox.app to 80 ("admin") and permissions to
+  // 0775.
+  if (![fileManager setAttributes:@{
+        NSFileGroupOwnerAccountID : @(80),
+        NSFilePosixPermissions : @(0775)
+      }
+                     ofItemAtPath:appDir
+                            error:&error] ||
+      error) {
+    return;
+  }
+
+  NSArray* permKeys =
+      [NSArray arrayWithObjects:NSFileGroupOwnerAccountID, NSFilePosixPermissions, nil];
+  // For all descendants of Firefox.app, set group ownership to 80 ("admin") and
+  // ensure write permission for the group.
+  for (NSString* currPath in paths) {
+    NSString* child = [appDir stringByAppendingPathComponent:currPath];
+    NSDictionary* oldAttributes = [fileManager attributesOfItemAtPath:child error:&error];
+    if (error) {
+      return;
+    }
+    // Skip symlinks, since they could be pointing to files outside of the .app
+    // bundle.
+    if ([oldAttributes fileType] == NSFileTypeSymbolicLink) {
+      continue;
+    }
+    NSNumber* oldPerms = (NSNumber*)[oldAttributes valueForKey:NSFilePosixPermissions];
+    NSArray* permObjects = [NSArray
+        arrayWithObjects:[NSNumber numberWithUnsignedLong:80],
+                         [NSNumber numberWithUnsignedLong:[oldPerms shortValue] | 020], nil];
+    NSDictionary* attributes = [NSDictionary dictionaryWithObjects:permObjects forKeys:permKeys];
+    if (![fileManager setAttributes:attributes ofItemAtPath:child error:&error] || error) {
+      return;
+    }
+  }
+}
+
+/**
+ * Helper to launch macOS tasks via NSTask.
+ */
+static void LaunchTask(NSString* aPath, NSArray* aArguments) {
+  if (@available(macOS 10.13, *)) {
+    NSTask* task = [[NSTask alloc] init];
+    [task setExecutableURL:[NSURL fileURLWithPath:aPath]];
+    if (aArguments) {
+      [task setArguments:aArguments];
+    }
+    [task launchAndReturnError:nil];
+    [task release];
+  } else {
+    NSArray* arguments = aArguments;
+    if (!arguments) {
+      arguments = @[];
+    }
+    [NSTask launchedTaskWithLaunchPath:aPath arguments:arguments];
+  }
+}
+
+static void RegisterAppWithLaunchServices(NSString* aBundlePath) {
+  NSArray* arguments = @[ @"-f", aBundlePath ];
+  LaunchTask(@"/System/Library/Frameworks/CoreServices.framework/Frameworks/"
+             @"LaunchServices.framework/Support/lsregister",
+             arguments);
+}
+
+static void StripQuarantineBit(NSString* aBundlePath) {
+  NSArray* arguments = @[ @"-d", @"com.apple.quarantine", aBundlePath ];
+  LaunchTask(@"/usr/bin/xattr", arguments);
+}
+
+bool PerformInstallationFromDMG(int argc, char** argv) {
+  MacAutoreleasePool pool;
+  if (argc < 4) {
+    return false;
+  }
+  NSString* bundlePath = [NSString stringWithUTF8String:argv[2]];
+  NSString* destPath = [NSString stringWithUTF8String:argv[3]];
+  if ([[NSFileManager defaultManager] copyItemAtPath:bundlePath toPath:destPath error:nil]) {
+    RegisterAppWithLaunchServices(destPath);
+    StripQuarantineBit(destPath);
+    return true;
+  }
+  return false;
+}