main.m   [plain text]

/*
* Copyright (c) 2017 Apple Inc. All Rights Reserved.
*
* @APPLE_LICENSE_HEADER_START@
*
* This file contains Original Code and/or Modifications of Original Code
* as defined in and that are subject to the Apple Public Source License
* Version 2.0 (the 'License'). You may not use this file except in
* compliance with the License. Please obtain a copy of the License at
* http://www.opensource.apple.com/apsl/ and read it before using this
* file.
*
* The Original Code and all software distributed under the License are
* distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
* EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
* INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
* Please see the License for the specific language governing rights and
* limitations under the License.
*
* @APPLE_LICENSE_HEADER_END@
*/

#include <TargetConditionals.h>
#import <Foundation/NSError_Private.h>
#import <dirhelper_priv.h>

#if TARGET_OS_OSX
#include <sandbox.h>
#include <notify.h>
#include <pwd.h>
#endif

#if TARGET_OS_SIMULATOR

int main(int argc, char** argv)
{
return 0;
}

#else

#import <Foundation/Foundation.h>
#import "supd.h"
#include "debugging.h"
#import <Foundation/NSXPCConnection_Private.h>
#include <xpc/private.h>

@interface ServiceDelegate : NSObject <NSXPCListenerDelegate>
@end

@implementation ServiceDelegate

- (BOOL)listener:(NSXPCListener *)listener shouldAcceptNewConnection:(NSXPCConnection *)newConnection {
/* Client must either have the supd entitlement or the trustd file helping entitlement.
* Each method of the protocol will additionally check for the entitlement it needs. */
NSNumber *supdEntitlement = [newConnection valueForEntitlement:@"com.apple.private.securityuploadd"];
BOOL hasSupdEntitlement = [supdEntitlement isKindOfClass:[NSNumber class]] && [supdEntitlement boolValue];
NSNumber *trustdHelperEntitlement = [newConnection valueForEntitlement:@"com.apple.private.trustd.FileHelp"];
BOOL hasTrustdHelperEntitlement = [trustdHelperEntitlement isKindOfClass:[NSNumber class]] && [trustdHelperEntitlement boolValue];

/* expose the protocol based the client's entitlement (a client can't do both) */
if (hasSupdEntitlement) {
secinfo("xpc", "Client (pid: %d) properly entitled for supd interface, let's go", [newConnection processIdentifier]);
newConnection.exportedInterface = [NSXPCInterface interfaceWithProtocol:@protocol(supdProtocol)];
} else if (hasTrustdHelperEntitlement) {
secinfo("xpc", "Client (pid: %d) properly entitled for trustd file helper interface, let's go", [newConnection processIdentifier]);
newConnection.exportedInterface = [NSXPCInterface interfaceWithProtocol:@protocol(TrustdFileHelper_protocol)];
} else {
secerror("xpc: Client (pid: %d) doesn't have entitlement", [newConnection processIdentifier]);
return NO;
}

supd *exportedObject = [[supd alloc] initWithConnection:newConnection];
newConnection.exportedObject = exportedObject;
[newConnection resume];
return YES;
}

@end

static void securityuploadd_sandbox(void)
{
#if TARGET_OS_OSX
// Enter the sandbox on macOS
char homeDir[PATH_MAX] = {};
struct passwd* pwd = getpwuid(getuid());
if (pwd == NULL) {
secerror("Failed to get home directory for user: %d", errno);
exit(EXIT_FAILURE);
}

if (realpath(pwd->pw_dir, homeDir) == NULL) {
strlcpy(homeDir, pwd->pw_dir, sizeof(homeDir));
}

const char *sandbox_params[] = {
"HOME", homeDir,
NULL
};

char *sberror = NULL;
secerror("initializing securityuploadd sandbox with HOME=%s", homeDir);
if (sandbox_init_with_parameters("com.apple.securityuploadd", SANDBOX_NAMED, sandbox_params, &sberror) != 0) {
secerror("Failed to enter securityuploadd sandbox: %{public}s", sberror);
exit(EXIT_FAILURE);
}
#endif
}

int main(int argc, const char *argv[])
{
secnotice("lifecycle", "supd lives!");
[NSError _setFileNameLocalizationEnabled:NO];
securityuploadd_sandbox();

ServiceDelegate *delegate = [ServiceDelegate new];

// Always create a supd instance to register for the background activity that doesn't check entitlements
static supd *activity_supd = nil;
activity_supd = [[supd alloc] initWithConnection:nil];

NSXPCListener *listener = [[NSXPCListener alloc] initWithMachServiceName:@"com.apple.securityuploadd"];
listener.delegate = delegate;

// We're always launched in response to client activity and don't want to sit around idle.
dispatch_after(dispatch_time(DISPATCH_TIME_NOW, 5ull * NSEC_PER_SEC), dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{
secnotice("lifecycle", "will exit when clean");
xpc_transaction_exit_clean();
});

[listener resume];
[[NSRunLoop currentRunLoop] run];
return 0;
}

#endif // !TARGET_OS_SIMULATOR