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/*
* set.m - High-level handler to set boot nonce
*
* Copyright (c) 2017 Siguza & tihmstar
*/
#include <errno.h>
#include <stdbool.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <sys/stat.h>
#include <mach/mach.h>
#include <IOKit/IOKitLib.h>
#include <CoreFoundation/CoreFoundation.h>
#include "arch.h"
#include "exploit64.h"
#include "nvpatch.h"
#include "set.h"
static int party_hard(void)
{
int ret = 0;
if(getuid() != 0) // Skip if we got root already
{
ret = -1;
vm_address_t kbase = 0;
task_t kernel_task = get_kernel_task(&kbase);
LOG("kernel_task: 0x%x", kernel_task);
if(MACH_PORT_VALID(kernel_task))
{
ret = nvpatch(kernel_task, kbase, "com.apple.System.boot-nonce");
}
}
return ret;
}
bool set_generator(const char *gen)
{
bool ret = false;
CFStringRef str = CFStringCreateWithCStringNoCopy(NULL, gen, kCFStringEncodingUTF8, kCFAllocatorNull);
CFMutableDictionaryRef dict = CFDictionaryCreateMutable(NULL, 0, &kCFCopyStringDictionaryKeyCallBacks, &kCFTypeDictionaryValueCallBacks);
if(!str || !dict)
{
LOG("Failed to allocate CF objects");
}
else
{
CFDictionarySetValue(dict, CFSTR("com.apple.System.boot-nonce"), str);
CFRelease(str);
io_service_t nvram = IOServiceGetMatchingService(kIOMasterPortDefault, IOServiceMatching("IODTNVRAM"));
if(!MACH_PORT_VALID(nvram))
{
LOG("Failed to get IODTNVRAM service");
}
else
{
if(party_hard() == 0)
{
kern_return_t kret = IORegistryEntrySetCFProperties(nvram, dict);
LOG("IORegistryEntrySetCFProperties: %s", mach_error_string(kret));
if(kret == KERN_SUCCESS)
{
ret = true;
}
}
}
CFRelease(dict);
}
return ret;
}
bool dump_apticket(const char *to)
{
bool ret = false;
if(party_hard() == 0)
{
const char *from = "/System/Library/Caches/apticket.der";
struct stat s;
if(stat(from, &s) != 0)
{
LOG("stat failed: %s", strerror(errno));
}
else
{
FILE *in = fopen(from, "rb");
if(in == NULL)
{
LOG("failed to open src: %s", strerror(errno));
}
else
{
FILE *out = fopen(to, "wb");
if(out == NULL)
{
LOG("failed to open dst: %s", strerror(errno));
}
else
{
char *buf = malloc(s.st_size);
if(buf == NULL)
{
LOG("failed to alloc buf: %s", strerror(errno));
}
else
{
fread(buf, s.st_size, 1, in);
fwrite(buf, s.st_size, 1, out);
free(buf);
ret = true;
}
fclose(out);
}
fclose(in);
}
}
}
return ret;
}