60 lines
1.3 KiB
C
60 lines
1.3 KiB
C
/* Copyright (C) 2015-2017 Jason A. Donenfeld <Jason@zx2c4.com>. All Rights Reserved. */
|
|
|
|
#include <errno.h>
|
|
#include <stdio.h>
|
|
#include <unistd.h>
|
|
#include <sys/types.h>
|
|
#include <sys/stat.h>
|
|
#include <string.h>
|
|
#include <fcntl.h>
|
|
#ifdef __linux__
|
|
#include <sys/syscall.h>
|
|
#endif
|
|
|
|
#include "curve25519.h"
|
|
#include "encoding.h"
|
|
#include "subcommands.h"
|
|
|
|
static inline ssize_t get_random_bytes(uint8_t *out, size_t len)
|
|
{
|
|
ssize_t ret;
|
|
int fd;
|
|
#if defined(__NR_getrandom) && defined(__linux__)
|
|
ret = syscall(__NR_getrandom, out, len, 0);
|
|
if (ret >= 0)
|
|
return ret;
|
|
#endif
|
|
fd = open("/dev/urandom", O_RDONLY);
|
|
if (fd < 0)
|
|
return fd;
|
|
ret = read(fd, out, len);
|
|
close(fd);
|
|
return ret;
|
|
}
|
|
|
|
int genkey_main(int argc, char *argv[])
|
|
{
|
|
uint8_t key[WG_KEY_LEN];
|
|
char base64[WG_KEY_LEN_BASE64];
|
|
struct stat stat;
|
|
|
|
if (argc != 1) {
|
|
fprintf(stderr, "Usage: %s %s\n", PROG_NAME, argv[0]);
|
|
return 1;
|
|
}
|
|
|
|
if (!fstat(STDOUT_FILENO, &stat) && S_ISREG(stat.st_mode) && stat.st_mode & S_IRWXO)
|
|
fputs("Warning: writing to world accessible file.\nConsider setting the umask to 077 and trying again.\n", stderr);
|
|
|
|
if (get_random_bytes(key, WG_KEY_LEN) != WG_KEY_LEN) {
|
|
perror("getrandom");
|
|
return 1;
|
|
}
|
|
if (!strcmp(argv[0], "genkey"))
|
|
curve25519_normalize_secret(key);
|
|
|
|
key_to_base64(base64, key);
|
|
puts(base64);
|
|
return 0;
|
|
}
|