mirror of
https://github.com/zerotier/ZeroTierOne.git
synced 2024-12-30 09:48:54 +00:00
304 lines
7.3 KiB
C++
304 lines
7.3 KiB
C++
/*
|
|
* Copyright (c)2019 ZeroTier, Inc.
|
|
*
|
|
* Use of this software is governed by the Business Source License included
|
|
* in the LICENSE.TXT file in the project's root directory.
|
|
*
|
|
* Change Date: 2025-01-01
|
|
*
|
|
* On the date above, in accordance with the Business Source License, use
|
|
* of this software will be governed by version 2.0 of the Apache License.
|
|
*/
|
|
/****/
|
|
|
|
#include <stdio.h>
|
|
#include <string.h>
|
|
#include <stdlib.h>
|
|
#include <stdarg.h>
|
|
#include <time.h>
|
|
#include <sys/stat.h>
|
|
|
|
#include "Constants.hpp"
|
|
|
|
#ifdef __UNIX_LIKE__
|
|
#include <unistd.h>
|
|
#include <errno.h>
|
|
#include <fcntl.h>
|
|
#include <sys/types.h>
|
|
#include <sys/stat.h>
|
|
#include <sys/uio.h>
|
|
#include <dirent.h>
|
|
#ifdef ZT_ARCH_ARM_HAS_NEON
|
|
#ifdef __LINUX__
|
|
#include <sys/auxv.h>
|
|
#endif
|
|
#endif
|
|
#endif
|
|
|
|
#ifdef __WINDOWS__
|
|
#include <wincrypt.h>
|
|
#include <intrin.h>
|
|
#endif
|
|
|
|
#include "Utils.hpp"
|
|
#include "Mutex.hpp"
|
|
#include "Salsa20.hpp"
|
|
|
|
#ifdef __APPLE__
|
|
#include <TargetConditionals.h>
|
|
#endif
|
|
|
|
#if defined(__ANDROID__) && defined(__aarch64__)
|
|
#include <asm/hwcap.h>
|
|
#endif
|
|
|
|
#ifdef ZT_ARCH_ARM_HAS_NEON
|
|
|
|
#ifdef __LINUX__
|
|
#include <sys/auxv.h>
|
|
#include <asm/hwcap.h>
|
|
#endif
|
|
|
|
#if defined(__FreeBSD__)
|
|
#include <elf.h>
|
|
#include <sys/auxv.h>
|
|
static inline long getauxval(int caps)
|
|
{
|
|
long hwcaps = 0;
|
|
elf_aux_info(caps, &hwcaps, sizeof(hwcaps));
|
|
return hwcaps;
|
|
}
|
|
#endif
|
|
|
|
// If these are not even defined, obviously they are not supported.
|
|
#ifndef HWCAP_AES
|
|
#define HWCAP_AES 0
|
|
#endif
|
|
#ifndef HWCAP_CRC32
|
|
#define HWCAP_CRC32 0
|
|
#endif
|
|
#ifndef HWCAP_PMULL
|
|
#define HWCAP_PMULL 0
|
|
#endif
|
|
#ifndef HWCAP_SHA1
|
|
#define HWCAP_SHA1 0
|
|
#endif
|
|
#ifndef HWCAP_SHA2
|
|
#define HWCAP_SHA2 0
|
|
#endif
|
|
|
|
#endif // ZT_ARCH_ARM_HAS_NEON
|
|
|
|
namespace ZeroTier {
|
|
|
|
const uint64_t Utils::ZERO256[4] = {0ULL,0ULL,0ULL,0ULL};
|
|
|
|
const char Utils::HEXCHARS[16] = { '0','1','2','3','4','5','6','7','8','9','a','b','c','d','e','f' };
|
|
|
|
#ifdef ZT_ARCH_ARM_HAS_NEON
|
|
Utils::ARMCapabilities::ARMCapabilities() noexcept
|
|
{
|
|
#ifdef __APPLE__
|
|
|
|
this->aes = true;
|
|
this->crc32 = true;
|
|
this->pmull = true;
|
|
this->sha1 = true;
|
|
this->sha2 = true;
|
|
|
|
#else
|
|
|
|
#ifdef HWCAP2_AES
|
|
if (sizeof(void *) == 4) {
|
|
const long hwcaps2 = getauxval(AT_HWCAP2);
|
|
this->aes = (hwcaps2 & HWCAP2_AES) != 0;
|
|
this->crc32 = (hwcaps2 & HWCAP2_CRC32) != 0;
|
|
this->pmull = (hwcaps2 & HWCAP2_PMULL) != 0;
|
|
this->sha1 = (hwcaps2 & HWCAP2_SHA1) != 0;
|
|
this->sha2 = (hwcaps2 & HWCAP2_SHA2) != 0;
|
|
} else {
|
|
#endif
|
|
const long hwcaps = getauxval(AT_HWCAP);
|
|
this->aes = (hwcaps & HWCAP_AES) != 0;
|
|
this->crc32 = (hwcaps & HWCAP_CRC32) != 0;
|
|
this->pmull = (hwcaps & HWCAP_PMULL) != 0;
|
|
this->sha1 = (hwcaps & HWCAP_SHA1) != 0;
|
|
this->sha2 = (hwcaps & HWCAP_SHA2) != 0;
|
|
#ifdef HWCAP2_AES
|
|
}
|
|
#endif
|
|
|
|
#endif // __APPLE__
|
|
}
|
|
|
|
const Utils::ARMCapabilities Utils::ARMCAP;
|
|
#endif
|
|
|
|
#ifdef ZT_ARCH_X64
|
|
|
|
Utils::CPUIDRegisters::CPUIDRegisters() noexcept
|
|
{
|
|
uint32_t eax, ebx, ecx, edx;
|
|
|
|
#ifdef __WINDOWS__
|
|
int regs[4];
|
|
__cpuid(regs,1);
|
|
eax = (uint32_t)regs[0];
|
|
ebx = (uint32_t)regs[1];
|
|
ecx = (uint32_t)regs[2];
|
|
edx = (uint32_t)regs[3];
|
|
#else
|
|
__asm__ __volatile__ (
|
|
"cpuid"
|
|
: "=a"(eax), "=b"(ebx), "=c"(ecx), "=d"(edx)
|
|
: "a"(1), "c"(0)
|
|
);
|
|
#endif
|
|
|
|
rdrand = ((ecx & (1U << 30U)) != 0);
|
|
aes = (((ecx & (1U << 25U)) != 0) && ((ecx & (1U << 19U)) != 0) && ((ecx & (1U << 1U)) != 0));
|
|
avx = ((ecx & (1U << 25U)) != 0);
|
|
|
|
#ifdef __WINDOWS__
|
|
__cpuid(regs,7);
|
|
eax = (uint32_t)regs[0];
|
|
ebx = (uint32_t)regs[1];
|
|
ecx = (uint32_t)regs[2];
|
|
edx = (uint32_t)regs[3];
|
|
#else
|
|
__asm__ __volatile__ (
|
|
"cpuid"
|
|
: "=a"(eax), "=b"(ebx), "=c"(ecx), "=d"(edx)
|
|
: "a"(7), "c"(0)
|
|
);
|
|
#endif
|
|
|
|
vaes = aes && avx && ((ecx & (1U << 9U)) != 0);
|
|
vpclmulqdq = aes && avx && ((ecx & (1U << 10U)) != 0);
|
|
avx2 = avx && ((ebx & (1U << 5U)) != 0);
|
|
avx512f = avx && ((ebx & (1U << 16U)) != 0);
|
|
sha = ((ebx & (1U << 29U)) != 0);
|
|
fsrm = ((edx & (1U << 4U)) != 0);
|
|
}
|
|
|
|
const Utils::CPUIDRegisters Utils::CPUID;
|
|
#endif
|
|
|
|
// Crazy hack to force memory to be securely zeroed in spite of the best efforts of optimizing compilers.
|
|
static void _Utils_doBurn(volatile uint8_t *ptr,unsigned int len)
|
|
{
|
|
volatile uint8_t *const end = ptr + len;
|
|
while (ptr != end) *(ptr++) = (uint8_t)0;
|
|
}
|
|
static void (*volatile _Utils_doBurn_ptr)(volatile uint8_t *,unsigned int) = _Utils_doBurn;
|
|
void Utils::burn(void *ptr,unsigned int len) { (_Utils_doBurn_ptr)((volatile uint8_t *)ptr,len); }
|
|
|
|
static unsigned long _Utils_itoa(unsigned long n,char *s)
|
|
{
|
|
if (n == 0)
|
|
return 0;
|
|
unsigned long pos = _Utils_itoa(n / 10,s);
|
|
if (pos >= 22) // sanity check, should be impossible
|
|
pos = 22;
|
|
s[pos] = '0' + (char)(n % 10);
|
|
return pos + 1;
|
|
}
|
|
char *Utils::decimal(unsigned long n,char s[24])
|
|
{
|
|
if (n == 0) {
|
|
s[0] = '0';
|
|
s[1] = (char)0;
|
|
return s;
|
|
}
|
|
s[_Utils_itoa(n,s)] = (char)0;
|
|
return s;
|
|
}
|
|
|
|
void Utils::getSecureRandom(void *buf,unsigned int bytes)
|
|
{
|
|
static Mutex globalLock;
|
|
static Salsa20 s20;
|
|
static bool s20Initialized = false;
|
|
static uint8_t randomBuf[65536];
|
|
static unsigned int randomPtr = sizeof(randomBuf);
|
|
|
|
Mutex::Lock _l(globalLock);
|
|
|
|
/* Just for posterity we Salsa20 encrypt the result of whatever system
|
|
* CSPRNG we use. There have been several bugs at the OS or OS distribution
|
|
* level in the past that resulted in systematically weak or predictable
|
|
* keys due to random seeding problems. This mitigates that by grabbing
|
|
* a bit of extra entropy and further randomizing the result, and comes
|
|
* at almost no cost and with no real downside if the random source is
|
|
* good. */
|
|
if (!s20Initialized) {
|
|
s20Initialized = true;
|
|
uint64_t s20Key[4];
|
|
s20Key[0] = (uint64_t)time(0); // system clock
|
|
s20Key[1] = (uint64_t)buf; // address of buf
|
|
s20Key[2] = (uint64_t)s20Key; // address of s20Key[]
|
|
s20Key[3] = (uint64_t)&s20; // address of s20
|
|
s20.init(s20Key,s20Key);
|
|
}
|
|
|
|
#ifdef __WINDOWS__
|
|
|
|
static HCRYPTPROV cryptProvider = NULL;
|
|
|
|
for(unsigned int i=0;i<bytes;++i) {
|
|
if (randomPtr >= sizeof(randomBuf)) {
|
|
if (cryptProvider == NULL) {
|
|
if (!CryptAcquireContextA(&cryptProvider,NULL,NULL,PROV_RSA_FULL,CRYPT_VERIFYCONTEXT|CRYPT_SILENT)) {
|
|
fprintf(stderr,"FATAL ERROR: Utils::getSecureRandom() unable to obtain WinCrypt context!\r\n");
|
|
exit(1);
|
|
}
|
|
}
|
|
if (!CryptGenRandom(cryptProvider,(DWORD)sizeof(randomBuf),(BYTE *)randomBuf)) {
|
|
fprintf(stderr,"FATAL ERROR: Utils::getSecureRandom() CryptGenRandom failed!\r\n");
|
|
exit(1);
|
|
}
|
|
randomPtr = 0;
|
|
s20.crypt12(randomBuf,randomBuf,sizeof(randomBuf));
|
|
s20.init(randomBuf,randomBuf);
|
|
}
|
|
((uint8_t *)buf)[i] = randomBuf[randomPtr++];
|
|
}
|
|
|
|
#else // not __WINDOWS__
|
|
|
|
static int devURandomFd = -1;
|
|
|
|
if (devURandomFd < 0) {
|
|
devURandomFd = ::open("/dev/urandom",O_RDONLY);
|
|
if (devURandomFd < 0) {
|
|
fprintf(stderr,"FATAL ERROR: Utils::getSecureRandom() unable to open /dev/urandom\n");
|
|
exit(1);
|
|
return;
|
|
}
|
|
}
|
|
|
|
for(unsigned int i=0;i<bytes;++i) {
|
|
if (randomPtr >= sizeof(randomBuf)) {
|
|
for(;;) {
|
|
if ((int)::read(devURandomFd,randomBuf,sizeof(randomBuf)) != (int)sizeof(randomBuf)) {
|
|
::close(devURandomFd);
|
|
devURandomFd = ::open("/dev/urandom",O_RDONLY);
|
|
if (devURandomFd < 0) {
|
|
fprintf(stderr,"FATAL ERROR: Utils::getSecureRandom() unable to open /dev/urandom\n");
|
|
exit(1);
|
|
return;
|
|
}
|
|
} else break;
|
|
}
|
|
randomPtr = 0;
|
|
s20.crypt12(randomBuf,randomBuf,sizeof(randomBuf));
|
|
s20.init(randomBuf,randomBuf);
|
|
}
|
|
((uint8_t *)buf)[i] = randomBuf[randomPtr++];
|
|
}
|
|
|
|
#endif // __WINDOWS__ or not
|
|
}
|
|
|
|
} // namespace ZeroTier
|