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/*
* Copyright (C) 2013 Martin Willi
* Copyright (C) 2013 revosec AG
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation; either version 2 of the License, or (at your
* option) any later version. See <http://www.fsf.org/copyleft/gpl.txt>.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* for more details.
*/
#import "Helper.h"
#include <ServiceManagement/ServiceManagement.h>
#include <Security/Authorization.h>
/* to check strongSwan version */
#include "../../../../config.h"
@implementation Helper {
/* XPC connection to the helper */
xpc_connection_t helper;
/* authorization instance, if authorized */
AuthorizationRef auth;
/* string of last error occurred */
NSString* errmsg;
}
- (void)setError:(NSString*)error
{
if (errmsg)
{
[errmsg release];
}
errmsg = error;
}
- (bool)authorize
{
AuthorizationItem item = { kSMRightBlessPrivilegedHelper, 0, NULL, 0 };
AuthorizationRights rights = { 1, &item };
OSStatus status;
if (auth)
{
return TRUE;
}
status = AuthorizationCreate(&rights, kAuthorizationEmptyEnvironment,
kAuthorizationFlagDefaults |
kAuthorizationFlagInteractionAllowed |
kAuthorizationFlagExtendRights, &auth);
if (status == errAuthorizationSuccess)
{
return TRUE;
}
if (errmsg)
{
[errmsg release];
}
[self setError:[NSString stringWithFormat:@"Authorization failed: %@",
SecCopyErrorMessageString(status, NULL)]];
return FALSE;
}
- (bool)manage:(CFStringRef)label bless:(bool)bless
{
bool done;
CFErrorRef error;
if (![self authorize])
{
return FALSE;
}
if (bless)
{
done = SMJobBless(kSMDomainSystemLaunchd, label, auth, &error);
}
else
{
done = SMJobRemove(kSMDomainSystemLaunchd, label, auth, TRUE, &error);
}
if (!done)
{
[self setError:
[NSString stringWithFormat:@"Installing privileged helper failed: %@",
CFErrorCopyDescription(error)]];
CFRelease(error);
}
return done;
}
- (bool)make:(CFStringRef)label
{
char str[128];
if (!CFStringGetCString(label, str, sizeof(str), kCFStringEncodingUTF8))
{
[self setError:@"converting XPC service name failed"];
return FALSE;
}
helper = xpc_connection_create_mach_service(str, NULL,
XPC_CONNECTION_MACH_SERVICE_PRIVILEGED);
if (!helper)
{
[self setError:@"creating XPC mach service failed"];
return FALSE;
}
xpc_connection_set_event_handler(helper, ^(xpc_object_t event) {
if (xpc_get_type(event) == XPC_TYPE_ERROR)
{
if (event == XPC_ERROR_CONNECTION_INTERRUPTED ||
event == XPC_ERROR_CONNECTION_INVALID)
{
if (helper)
{
xpc_connection_cancel(helper);
helper = NULL;
}
}
}
});
xpc_connection_resume(helper);
return TRUE;
}
- (bool)checkVersion
{
xpc_object_t request, response;
bool match = FALSE;
request = xpc_dictionary_create(NULL, NULL, 0);
xpc_dictionary_set_string(request, "type", "rpc");
xpc_dictionary_set_string(request, "rpc", "get_version");
response = xpc_connection_send_message_with_reply_sync(helper, request);
xpc_release(request);
if (xpc_get_type(response) == XPC_TYPE_DICTIONARY)
{
match = strcmp(xpc_dictionary_get_string(response, "version"),
PACKAGE_VERSION) == 0;
}
xpc_release(response);
return match;
}
- (bool)makeAndCheck:(CFStringRef)label
{
if (![self make:label])
{
return FALSE;
}
if ([self checkVersion])
{
return TRUE;
}
xpc_connection_cancel(helper);
helper = NULL;
/* version outdated, uninstall old helper */
[self manage:label bless:FALSE];
return FALSE;
}
- (bool)blessAndMake:(CFStringRef)label
{
#ifdef DEBUG
/* always update helper when debugging */
[self manage:label bless:FALSE];
[self manage:label bless:TRUE];
#endif
if (![self makeAndCheck:label])
{
if ([self manage:label bless:TRUE])
{
[self makeAndCheck:label];
}
}
return helper;
}
- (xpc_connection_t)getConnection
{
if (!helper)
{
[self blessAndMake:CFSTR("org.strongswan.charon-xpc")];
}
return helper;
}
- (NSString*)getError
{
return errmsg;
}
- (id)init
{
self = [super init];
return self;
}
- (void)dealloc
{
if (helper)
{
xpc_connection_cancel(helper);
}
if (auth)
{
AuthorizationFree(auth, kAuthorizationFlagDefaults);
}
if (errmsg)
{
[errmsg release];
}
[super dealloc];
}
@end
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