mirror of https://github.com/sudo-project/sudo.git
100 lines
2.6 KiB
C
100 lines
2.6 KiB
C
/*
|
|
* SPDX-License-Identifier: ISC
|
|
*
|
|
* Copyright (c) 2020 Todd C. Miller <Todd.Miller@sudo.ws>
|
|
*
|
|
* Permission to use, copy, modify, and distribute this software for any
|
|
* purpose with or without fee is hereby granted, provided that the above
|
|
* copyright notice and this permission notice appear in all copies.
|
|
*
|
|
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
|
|
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
|
|
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
|
|
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
|
|
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
|
|
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
|
|
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
|
|
*/
|
|
|
|
/*
|
|
* This is an open source non-commercial project. Dear PVS-Studio, please check it.
|
|
* PVS-Studio Static Code Analyzer for C, C++ and C#: http://www.viva64.com
|
|
*/
|
|
|
|
#include <config.h>
|
|
|
|
#include <stdlib.h>
|
|
#if defined(HAVE_STDINT_H)
|
|
# include <stdint.h>
|
|
#elif defined(HAVE_INTTYPES_H)
|
|
# include <inttypes.h>
|
|
#endif
|
|
#include <string.h>
|
|
#include <arpa/inet.h>
|
|
|
|
#include <sudo_compat.h>
|
|
#include <sudo_util.h>
|
|
#include <sudo_rand.h>
|
|
|
|
struct uuid {
|
|
uint32_t time_low;
|
|
uint16_t time_mid;
|
|
uint16_t time_hi_and_version;
|
|
uint8_t clock_seq_hi_and_reserved;
|
|
uint8_t clock_seq_low;
|
|
uint8_t node[6];
|
|
};
|
|
|
|
/*
|
|
* Create a type 4 (random), variant 1 universally unique identifier (UUID).
|
|
* As per RFC 4122 section 4.4.
|
|
*/
|
|
void
|
|
sudo_uuid_create_v1(unsigned char uuid_out[restrict static 16])
|
|
{
|
|
struct uuid uuid;
|
|
|
|
arc4random_buf(&uuid, sizeof(uuid));
|
|
|
|
/* Set version to 4 (random), 4 most significant bits (12-15) are 0010. */
|
|
uuid.time_hi_and_version &= 0x0fff;
|
|
uuid.time_hi_and_version |= 0x4000;
|
|
|
|
/* Set variant to 1: two most significant bits (6 and 7) are 01. */
|
|
uuid.clock_seq_hi_and_reserved &= 0x3f;
|
|
uuid.clock_seq_hi_and_reserved |= 0x80;
|
|
|
|
memcpy(uuid_out, &uuid, 16);
|
|
}
|
|
|
|
/*
|
|
* Format a uuid as a 36-byte string (plus one for the NUL).
|
|
*/
|
|
char *
|
|
sudo_uuid_to_string_v1(const unsigned char uuid[restrict static 16], char * restrict dst, size_t dstsiz)
|
|
{
|
|
const char hex[] = "0123456789abcdef";
|
|
char *cp = dst;
|
|
unsigned int i;
|
|
|
|
if (dstsiz < sizeof("123e4567-e89b-12d3-a456-426655440000"))
|
|
return NULL;
|
|
|
|
for (i = 0; i < 16; i++) {
|
|
*cp++ = hex[uuid[i] >> 4];
|
|
*cp++ = hex[uuid[i] & 0x0f];
|
|
|
|
switch (i) {
|
|
case 4:
|
|
case 6:
|
|
case 8:
|
|
case 10:
|
|
*cp++ = '-';
|
|
break;
|
|
}
|
|
}
|
|
*cp = '\0';
|
|
|
|
return dst;
|
|
}
|