mirror of git://git.zx2c4.com/wireguard-tools
100 lines
2.3 KiB
C
100 lines
2.3 KiB
C
// SPDX-License-Identifier: GPL-2.0 OR MIT
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/*
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* Copyright (C) 2015-2020 Jason A. Donenfeld <Jason@zx2c4.com>. All Rights Reserved.
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*/
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#include <errno.h>
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#include <stdio.h>
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#include <stdbool.h>
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#include <unistd.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <string.h>
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#include <fcntl.h>
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#ifdef __linux__
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#include <sys/syscall.h>
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#endif
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#ifdef __APPLE__
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#include <AvailabilityMacros.h>
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#ifndef MAC_OS_X_VERSION_10_12
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#define MAC_OS_X_VERSION_10_12 101200
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#endif
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#if MAC_OS_X_VERSION_MIN_REQUIRED >= MAC_OS_X_VERSION_10_12
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#include <sys/random.h>
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#endif
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#endif
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#include "curve25519.h"
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#include "encoding.h"
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#include "subcommands.h"
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#ifndef _WIN32
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static inline bool __attribute__((__warn_unused_result__)) get_random_bytes(uint8_t *out, size_t len)
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{
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ssize_t ret = 0;
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size_t i;
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int fd;
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if (len > 256) {
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errno = EOVERFLOW;
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return false;
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}
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#if defined(__OpenBSD__) || (defined(__APPLE__) && MAC_OS_X_VERSION_MIN_REQUIRED >= MAC_OS_X_VERSION_10_12) || (defined(__GLIBC__) && (__GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 25)))
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if (!getentropy(out, len))
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return true;
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#endif
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#if defined(__NR_getrandom) && defined(__linux__)
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if (syscall(__NR_getrandom, out, len, 0) == (ssize_t)len)
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return true;
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#endif
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fd = open("/dev/urandom", O_RDONLY);
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if (fd < 0)
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return false;
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for (errno = 0, i = 0; i < len; i += ret, ret = 0) {
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ret = read(fd, out + i, len - i);
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if (ret <= 0) {
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ret = errno ? -errno : -EIO;
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break;
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}
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}
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close(fd);
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errno = -ret;
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return i == len;
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}
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#else
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#include <ntsecapi.h>
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static inline bool __attribute__((__warn_unused_result__)) get_random_bytes(uint8_t *out, size_t len)
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{
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return RtlGenRandom(out, len);
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}
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#endif
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int genkey_main(int argc, const char *argv[])
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{
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uint8_t key[WG_KEY_LEN];
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char base64[WG_KEY_LEN_BASE64];
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struct stat stat;
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if (argc != 1) {
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fprintf(stderr, "Usage: %s %s\n", PROG_NAME, argv[0]);
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return 1;
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}
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if (!fstat(STDOUT_FILENO, &stat) && S_ISREG(stat.st_mode) && stat.st_mode & S_IRWXO)
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fputs("Warning: writing to world accessible file.\nConsider setting the umask to 077 and trying again.\n", stderr);
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if (!get_random_bytes(key, WG_KEY_LEN)) {
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perror("getrandom");
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return 1;
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}
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if (!strcmp(argv[0], "genkey"))
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curve25519_clamp_secret(key);
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key_to_base64(base64, key);
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puts(base64);
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return 0;
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}
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