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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* 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 "MacLaunchHelper.h"
#include "MacAutoreleasePool.h"
#include "mozilla/UniquePtr.h"
#include <Cocoa/Cocoa.h>
#include <crt_externs.h>
#include <ServiceManagement/ServiceManagement.h>
#include <Security/Authorization.h>
#include <spawn.h>
#include <stdio.h>
using namespace mozilla;
void LaunchChildMac(int aArgc, char** aArgv, pid_t* aPid) {
MacAutoreleasePool pool;
@try {
NSString* launchPath = [NSString stringWithUTF8String:aArgv[0]];
NSMutableArray* arguments = [NSMutableArray arrayWithCapacity:aArgc - 1];
for (int i = 1; i < aArgc; i++) {
[arguments addObject:[NSString stringWithUTF8String:aArgv[i]]];
}
NSTask* child = [NSTask launchedTaskWithLaunchPath:launchPath arguments:arguments];
if (aPid) {
*aPid = [child processIdentifier];
// We used to use waitpid to wait for the process to terminate. This is
// incompatible with NSTask and we wait for the process to exit here
// instead.
[child waitUntilExit];
}
} @catch (NSException* e) {
NSLog(@"%@: %@", e.name, e.reason);
}
}
bool InstallPrivilegedHelper() {
AuthorizationRef authRef = NULL;
OSStatus status = AuthorizationCreate(
NULL, kAuthorizationEmptyEnvironment,
kAuthorizationFlagDefaults | kAuthorizationFlagInteractionAllowed, &authRef);
if (status != errAuthorizationSuccess) {
// AuthorizationCreate really shouldn't fail.
NSLog(@"AuthorizationCreate failed! NSOSStatusErrorDomain / %d", (int)status);
return NO;
}
BOOL result = NO;
AuthorizationItem authItem = {kSMRightBlessPrivilegedHelper, 0, NULL, 0};
AuthorizationRights authRights = {1, &authItem};
AuthorizationFlags flags = kAuthorizationFlagDefaults | kAuthorizationFlagInteractionAllowed |
kAuthorizationFlagPreAuthorize | kAuthorizationFlagExtendRights;
// Obtain the right to install our privileged helper tool.
status =
AuthorizationCopyRights(authRef, &authRights, kAuthorizationEmptyEnvironment, flags, NULL);
if (status != errAuthorizationSuccess) {
NSLog(@"AuthorizationCopyRights failed! NSOSStatusErrorDomain / %d", (int)status);
} else {
CFErrorRef cfError;
// This does all the work of verifying the helper tool against the
// application and vice-versa. Once verification has passed, the embedded
// launchd.plist is extracted and placed in /Library/LaunchDaemons and then
// loaded. The executable is placed in /Library/PrivilegedHelperTools.
result = (BOOL)SMJobBless(kSMDomainSystemLaunchd, (CFStringRef) @"org.mozilla.updater", authRef,
&cfError);
if (!result) {
NSLog(@"Unable to install helper!");
CFRelease(cfError);
}
}
return result;
}
void AbortElevatedUpdate() {
mozilla::MacAutoreleasePool pool;
id updateServer = nil;
int currTry = 0;
const int numRetries = 10; // Number of IPC connection retries before
// giving up.
while (currTry < numRetries) {
@try {
updateServer = (id)[NSConnection
rootProxyForConnectionWithRegisteredName:@"org.mozilla.updater.server"
host:nil
usingNameServer:[NSSocketPortNameServer sharedInstance]];
if (updateServer && [updateServer respondsToSelector:@selector(abort)]) {
[updateServer performSelector:@selector(abort)];
return;
}
NSLog(@"Server doesn't exist or doesn't provide correct selectors.");
sleep(1); // Wait 1 second.
currTry++;
} @catch (NSException* e) {
NSLog(@"Encountered exception, retrying: %@: %@", e.name, e.reason);
sleep(1); // Wait 1 second.
currTry++;
}
}
NSLog(@"Unable to clean up updater.");
}
bool LaunchElevatedUpdate(int aArgc, char** aArgv, pid_t* aPid) {
LaunchChildMac(aArgc, aArgv, aPid);
bool didSucceed = InstallPrivilegedHelper();
if (!didSucceed) {
AbortElevatedUpdate();
}
return didSucceed;
}
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