mirror of
https://github.com/zerotier/ZeroTierOne.git
synced 2024-12-24 07:06:39 +00:00
420 lines
11 KiB
C++
420 lines
11 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: 2023-01-01
|
|
*
|
|
* 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>
|
|
#endif
|
|
|
|
#ifdef __WINDOWS__
|
|
#include <wincrypt.h>
|
|
#endif
|
|
|
|
#include "Utils.hpp"
|
|
#include "Mutex.hpp"
|
|
#include "Salsa20.hpp"
|
|
#include "AES.hpp"
|
|
#include "SHA512.hpp"
|
|
|
|
namespace ZeroTier {
|
|
|
|
#if (defined(__amd64) || defined(__amd64__) || defined(__x86_64) || defined(__x86_64__) || defined(__AMD64) || defined(__AMD64__) || defined(_M_X64))
|
|
static bool _zt_rdrand_supported()
|
|
{
|
|
#ifdef __WINDOWS__
|
|
int regs[4];
|
|
__cpuid(regs,1);
|
|
return (((regs[2] >> 30) & 1) != 0);
|
|
#else
|
|
uint32_t eax,ebx,ecx,edx;
|
|
__asm__ __volatile__ (
|
|
"cpuid"
|
|
: "=a"(eax),"=b"(ebx),"=c"(ecx),"=d"(edx)
|
|
: "a"(1),"c"(0)
|
|
);
|
|
return ((ecx & (1 << 30)) != 0);
|
|
#endif
|
|
}
|
|
static const bool _rdrandSupported = _zt_rdrand_supported();
|
|
#endif
|
|
|
|
const char Utils::HEXCHARS[16] = { '0','1','2','3','4','5','6','7','8','9','a','b','c','d','e','f' };
|
|
|
|
// 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;
|
|
}
|
|
|
|
unsigned int Utils::unhex(const char *h,void *buf,unsigned int buflen)
|
|
{
|
|
unsigned int l = 0;
|
|
while (l < buflen) {
|
|
uint8_t hc = *(reinterpret_cast<const uint8_t *>(h++));
|
|
if (!hc) break;
|
|
|
|
uint8_t c = 0;
|
|
if ((hc >= 48)&&(hc <= 57)) // 0..9
|
|
c = hc - 48;
|
|
else if ((hc >= 97)&&(hc <= 102)) // a..f
|
|
c = hc - 87;
|
|
else if ((hc >= 65)&&(hc <= 70)) // A..F
|
|
c = hc - 55;
|
|
|
|
hc = *(reinterpret_cast<const uint8_t *>(h++));
|
|
if (!hc) break;
|
|
|
|
c <<= 4;
|
|
if ((hc >= 48)&&(hc <= 57))
|
|
c |= hc - 48;
|
|
else if ((hc >= 97)&&(hc <= 102))
|
|
c |= hc - 87;
|
|
else if ((hc >= 65)&&(hc <= 70))
|
|
c |= hc - 55;
|
|
|
|
reinterpret_cast<uint8_t *>(buf)[l++] = c;
|
|
}
|
|
return l;
|
|
}
|
|
|
|
unsigned int Utils::unhex(const char *h,unsigned int hlen,void *buf,unsigned int buflen)
|
|
{
|
|
unsigned int l = 0;
|
|
const char *hend = h + hlen;
|
|
while (l < buflen) {
|
|
if (h == hend) break;
|
|
uint8_t hc = *(reinterpret_cast<const uint8_t *>(h++));
|
|
if (!hc) break;
|
|
|
|
uint8_t c = 0;
|
|
if ((hc >= 48)&&(hc <= 57))
|
|
c = hc - 48;
|
|
else if ((hc >= 97)&&(hc <= 102))
|
|
c = hc - 87;
|
|
else if ((hc >= 65)&&(hc <= 70))
|
|
c = hc - 55;
|
|
|
|
if (h == hend) break;
|
|
hc = *(reinterpret_cast<const uint8_t *>(h++));
|
|
if (!hc) break;
|
|
|
|
c <<= 4;
|
|
if ((hc >= 48)&&(hc <= 57))
|
|
c |= hc - 48;
|
|
else if ((hc >= 97)&&(hc <= 102))
|
|
c |= hc - 87;
|
|
else if ((hc >= 65)&&(hc <= 70))
|
|
c |= hc - 55;
|
|
|
|
reinterpret_cast<uint8_t *>(buf)[l++] = c;
|
|
}
|
|
return l;
|
|
}
|
|
|
|
void Utils::getSecureRandom(void *buf,unsigned int bytes)
|
|
{
|
|
static Mutex globalLock;
|
|
static bool initialized = false;
|
|
static uint64_t randomState[4];
|
|
static uint8_t randomBuf[16384];
|
|
static unsigned long randomPtr = sizeof(randomBuf);
|
|
|
|
Mutex::Lock gl(globalLock);
|
|
|
|
for(unsigned int i=0;i<bytes;++i) {
|
|
if (randomPtr >= sizeof(randomBuf)) {
|
|
randomPtr = 0;
|
|
|
|
if (unlikely(!initialized)) {
|
|
initialized = true;
|
|
#ifdef __WINDOWS__
|
|
HCRYPTPROV 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(randomState),(BYTE *)randomState)) {
|
|
fprintf(stderr,"FATAL ERROR: Utils::getSecureRandom() CryptGenRandom failed!\r\n");
|
|
exit(1);
|
|
}
|
|
if (!CryptGenRandom(cryptProvider,(DWORD)sizeof(randomBuf),(BYTE *)randomBuf)) {
|
|
fprintf(stderr,"FATAL ERROR: Utils::getSecureRandom() CryptGenRandom failed!\r\n");
|
|
exit(1);
|
|
}
|
|
CryptReleaseContext(cryptProvider,0);
|
|
#else
|
|
int devURandomFd = ::open("/dev/urandom",O_RDONLY);
|
|
if (devURandomFd < 0) {
|
|
fprintf(stderr,"FATAL ERROR: Utils::getSecureRandom() unable to open /dev/urandom\n");
|
|
exit(1);
|
|
}
|
|
if ((int)::read(devURandomFd,randomState,sizeof(randomState)) != (int)sizeof(randomState)) {
|
|
::close(devURandomFd);
|
|
fprintf(stderr,"FATAL ERROR: Utils::getSecureRandom() unable to read from /dev/urandom\n");
|
|
exit(1);
|
|
}
|
|
if ((int)::read(devURandomFd,randomBuf,sizeof(randomBuf)) != (int)sizeof(randomBuf)) {
|
|
::close(devURandomFd);
|
|
fprintf(stderr,"FATAL ERROR: Utils::getSecureRandom() unable to read from /dev/urandom\n");
|
|
exit(1);
|
|
}
|
|
close(devURandomFd);
|
|
#endif
|
|
|
|
// Mix in additional entropy just in case the standard random source is wonky somehow
|
|
randomState[0] ^= (uint64_t)time(nullptr);
|
|
randomState[1] ^= (uint64_t)((uintptr_t)buf);
|
|
#if (defined(__amd64) || defined(__amd64__) || defined(__x86_64) || defined(__x86_64__) || defined(__AMD64) || defined(__AMD64__) || defined(_M_X64))
|
|
if (_rdrandSupported) {
|
|
uint64_t tmp = 0;
|
|
_rdrand64_step((unsigned long long *)&tmp);
|
|
randomState[2] ^= tmp;
|
|
_rdrand64_step((unsigned long long *)&tmp);
|
|
randomState[3] ^= tmp;
|
|
}
|
|
#endif
|
|
}
|
|
|
|
uint8_t h[48];
|
|
for(unsigned int k=0;k<4;++k) { // treat random state like a 256-bit counter; endian-ness is irrelevant since we just want random
|
|
if (++randomState[k] != 0)
|
|
break;
|
|
}
|
|
HMACSHA384((const uint8_t *)randomState,randomBuf,sizeof(randomBuf),h); // compute HMAC on random buffer using state as secret key
|
|
AES c(h);
|
|
c.ctr(h + 32,randomBuf,sizeof(randomBuf),randomBuf); // encrypt random buffer with AES-CTR using HMAC result as key
|
|
}
|
|
|
|
((uint8_t *)buf)[i] = randomBuf[randomPtr++];
|
|
}
|
|
}
|
|
|
|
int Utils::b32e(const uint8_t *data,int length,char *result,int bufSize)
|
|
{
|
|
if (length < 0 || length > (1 << 28)) {
|
|
result[0] = (char)0;
|
|
return -1;
|
|
}
|
|
int count = 0;
|
|
if (length > 0) {
|
|
int buffer = data[0];
|
|
int next = 1;
|
|
int bitsLeft = 8;
|
|
while (count < bufSize && (bitsLeft > 0 || next < length)) {
|
|
if (bitsLeft < 5) {
|
|
if (next < length) {
|
|
buffer <<= 8;
|
|
buffer |= data[next++] & 0xFF;
|
|
bitsLeft += 8;
|
|
} else {
|
|
int pad = 5 - bitsLeft;
|
|
buffer <<= pad;
|
|
bitsLeft += pad;
|
|
}
|
|
}
|
|
int index = 0x1F & (buffer >> (bitsLeft - 5));
|
|
bitsLeft -= 5;
|
|
result[count++] = "abcdefghijklmnopqrstuvwxyZ234567"[index];
|
|
}
|
|
}
|
|
if (count < bufSize) {
|
|
result[count] = (char)0;
|
|
return count;
|
|
}
|
|
result[0] = (char)0;
|
|
return -1;
|
|
}
|
|
|
|
int Utils::b32d(const char *encoded,uint8_t *result,int bufSize)
|
|
{
|
|
int buffer = 0;
|
|
int bitsLeft = 0;
|
|
int count = 0;
|
|
for (const uint8_t *ptr = (const uint8_t *)encoded;count<bufSize && *ptr; ++ptr) {
|
|
uint8_t ch = *ptr;
|
|
if (ch == ' ' || ch == '\t' || ch == '\r' || ch == '\n' || ch == '-' || ch == '.') {
|
|
continue;
|
|
}
|
|
buffer <<= 5;
|
|
|
|
if (ch == '0') {
|
|
ch = 'O';
|
|
} else if (ch == '1') {
|
|
ch = 'L';
|
|
} else if (ch == '8') {
|
|
ch = 'B';
|
|
}
|
|
|
|
if ((ch >= 'A' && ch <= 'Z') || (ch >= 'a' && ch <= 'z')) {
|
|
ch = (ch & 0x1F) - 1;
|
|
} else if (ch >= '2' && ch <= '7') {
|
|
ch -= '2' - 26;
|
|
} else {
|
|
return -1;
|
|
}
|
|
|
|
buffer |= ch;
|
|
bitsLeft += 5;
|
|
if (bitsLeft >= 8) {
|
|
result[count++] = buffer >> (bitsLeft - 8);
|
|
bitsLeft -= 8;
|
|
}
|
|
}
|
|
if (count < bufSize)
|
|
result[count] = (uint8_t)0;
|
|
return count;
|
|
}
|
|
|
|
unsigned int Utils::b64e(const uint8_t *in,unsigned int inlen,char *out,unsigned int outlen)
|
|
{
|
|
static const char base64en[64] = { 'A','B','C','D','E','F','G','H','I','J','K','L','M','N','O','P','Q','R','S','T','U','V','W','X','Y','Z','a','b','c','d','e','f','g','h','i','j','k','l','m','n','o','p','q','r','s','t','u','v','w','x','y','z','0','1','2','3','4','5','6','7','8','9','+','/' };
|
|
unsigned int i = 0,j = 0;
|
|
uint8_t l = 0;
|
|
int s = 0;
|
|
for (;i<inlen;++i) {
|
|
uint8_t c = in[i];
|
|
switch (s) {
|
|
case 0:
|
|
s = 1;
|
|
if (j >= outlen) return 0;
|
|
out[j++] = base64en[(c >> 2) & 0x3f];
|
|
break;
|
|
case 1:
|
|
s = 2;
|
|
if (j >= outlen) return 0;
|
|
out[j++] = base64en[((l & 0x3) << 4) | ((c >> 4) & 0xf)];
|
|
break;
|
|
case 2:
|
|
s = 0;
|
|
if (j >= outlen) return 0;
|
|
out[j++] = base64en[((l & 0xf) << 2) | ((c >> 6) & 0x3)];
|
|
if (j >= outlen) return 0;
|
|
out[j++] = base64en[c & 0x3f];
|
|
break;
|
|
}
|
|
l = c;
|
|
}
|
|
switch (s) {
|
|
case 1:
|
|
if (j >= outlen) return 0;
|
|
out[j++] = base64en[(l & 0x3) << 4];
|
|
//out[j++] = '=';
|
|
//out[j++] = '=';
|
|
break;
|
|
case 2:
|
|
if (j >= outlen) return 0;
|
|
out[j++] = base64en[(l & 0xf) << 2];
|
|
//out[j++] = '=';
|
|
break;
|
|
}
|
|
if (j >= outlen) return 0;
|
|
out[j] = 0;
|
|
return j;
|
|
}
|
|
|
|
unsigned int Utils::b64d(const char *in,unsigned char *out,unsigned int outlen)
|
|
{
|
|
static const uint8_t base64de[256] = { 255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,62,255,255,255,63,52,53,54,55,56,57,58,59,60,61,255,255,255,255,255,255,255,0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,255,255,255,255,255,255,26,27,28,29,30,31,32,33,34,35,36,37,38,39,40,41,42,43,44,45,46,47,48,49,50,51,255,255,255,255,255 };
|
|
unsigned int i = 0;
|
|
unsigned int j = 0;
|
|
while ((in[i] != '=')&&(in[i] != 0)) {
|
|
if (j >= outlen)
|
|
break;
|
|
uint8_t c = base64de[(unsigned char)in[i]];
|
|
if (c != 255) {
|
|
switch (i & 0x3) {
|
|
case 0:
|
|
out[j] = (c << 2) & 0xff;
|
|
break;
|
|
case 1:
|
|
out[j++] |= (c >> 4) & 0x3;
|
|
out[j] = (c & 0xf) << 4;
|
|
break;
|
|
case 2:
|
|
out[j++] |= (c >> 2) & 0xf;
|
|
out[j] = (c & 0x3) << 6;
|
|
break;
|
|
case 3:
|
|
out[j++] |= c;
|
|
break;
|
|
}
|
|
}
|
|
++i;
|
|
}
|
|
return j;
|
|
}
|
|
|
|
#define ROL64(x,k) (((x) << (k)) | ((x) >> (64 - (k))))
|
|
uint64_t Utils::random()
|
|
{
|
|
// https://en.wikipedia.org/wiki/Xorshift#xoshiro256**
|
|
static Mutex l;
|
|
static uint64_t s0 = Utils::getSecureRandom64();
|
|
static uint64_t s1 = Utils::getSecureRandom64();
|
|
static uint64_t s2 = Utils::getSecureRandom64();
|
|
static uint64_t s3 = Utils::getSecureRandom64();
|
|
|
|
l.lock();
|
|
const uint64_t result = ROL64(s1 * 5,7) * 9;
|
|
const uint64_t t = s1 << 17;
|
|
s2 ^= s0;
|
|
s3 ^= s1;
|
|
s1 ^= s2;
|
|
s0 ^= s3;
|
|
s2 ^= t;
|
|
s3 = ROL64(s3,45);
|
|
l.unlock();
|
|
|
|
return result;
|
|
}
|
|
|
|
} // namespace ZeroTier
|