diff --git a/pkgs/default.nix b/pkgs/default.nix index e719d4e..7cc9ea1 100644 --- a/pkgs/default.nix +++ b/pkgs/default.nix @@ -99,6 +99,7 @@ in { run-liminix-vm = callPackage ./run-liminix-vm {}; s6-init-bin = callPackage ./s6-init-bin {}; s6-rc-database = callPackage ./s6-rc-database {}; + seedrng = callPackage ./seedrng {}; # schnapps is written by Turris and provides a high-level interface # to btrfs snapshots. It may be useful on the Turris Omnia to diff --git a/pkgs/seedrng/COPYING b/pkgs/seedrng/COPYING new file mode 100644 index 0000000..0c5e554 --- /dev/null +++ b/pkgs/seedrng/COPYING @@ -0,0 +1,712 @@ +This project is licensed under any one of: + +- GPL-2.0 +- Apache-2.0 +- MIT +- BSD-1-Clause +- CC0-1.0 + +Choose which one works best for you. 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Affirmer understands and acknowledges that Creative Commons is not a + party to this document and has no duty or obligation with respect to + this CC0 or use of the Work. +------------------------------------------------------------------------------- diff --git a/pkgs/seedrng/Makefile b/pkgs/seedrng/Makefile new file mode 100644 index 0000000..35e783c --- /dev/null +++ b/pkgs/seedrng/Makefile @@ -0,0 +1,18 @@ +PREFIX ?= /usr +DESTDIR ?= +SBINDIR ?= $(PREFIX)/sbin +LOCALSTATEDIR ?= /var/lib +CFLAGS ?= -O2 -pipe + +CFLAGS += -Wall -Wextra -pedantic +CFLAGS += -DLOCALSTATEDIR="\"$(LOCALSTATEDIR)\"" + +seedrng: seedrng.c + +install: seedrng + install -v -d "$(DESTDIR)$(SBINDIR)" && install -v -m 0755 seedrng "$(DESTDIR)$(SBINDIR)/seedrng" + +clean: + rm -f seedrng + +.PHONY: clean diff --git a/pkgs/seedrng/README.md b/pkgs/seedrng/README.md new file mode 100644 index 0000000..a8ceacd --- /dev/null +++ b/pkgs/seedrng/README.md @@ -0,0 +1,72 @@ +## SeedRNG — `seedrng(8)` +##### by [Jason A. Donenfeld](mailto:Jason@zx2c4.com) + +SeedRNG is a simple program made for seeding the Linux kernel random number +generator from seed files. The program takes no arguments, must be run as root, +and always attempts to do something useful. + +This program is useful in light of the fact that the Linux kernel RNG cannot be +initialized from shell scripts, and new seeds cannot be safely generated from +boot time shell scripts either. + +It should be run once at init time and once at shutdown time. It can be run at +other times without detriment as well. Whenever it is run, it writes existing +seed files into the RNG pool, and then creates a new seed file. If the RNG is +initialized at the time of creating a new seed file, then that new seed file is +marked as "creditable", which means it can be used to initialize the RNG. +Otherwise, it is marked as "non-creditable", in which case it is still used to +seed the RNG's pool, but will not initialize the RNG. + +In order to ensure that entropy only ever stays the same or increases from one +seed file to the next, old seed values are hashed together with new seed values +when writing new seed files: + +``` +new_seed = new_seed[:-32] || HASH(fixed_prefix || real_time || boot_time || old_seed_len || old_seed || new_seed_len || new_seed) +``` + +The seed is stored in `LOCALSTATEDIR/seedrng/`, which can be adjusted at +compile time. If the `SEEDRNG_SKIP_CREDIT` environment variable is set to `1`, +`true`, `yes`, or `y`, then seeds never credit the RNG, even if the seed file +is creditable. + +Being a single C file, `seedrng.c`, SeedRNG is meant to be copy and pasted +verbatim into various minimal init system projects and tweaked as needed. +**Please do not package this repo as a standalone program**: it is intended as +utility code meant to be imported into existing projects instead. + +### Building & Installing + +``` +$ make +$ sudo make install +``` + +In addition to the usual compiler environment variables (`CFLAGS`, etc), the +following environment variable is respected during compilation: + + * `LOCALSTATEDIR` default: `/var/lib` + +The following environment variables are respected during installation: + + * `PREFIX` default: `/usr` + * `DESTDIR` default: + * `SBINDIR` default: `$(PREFIX)/sbin` + +### Usage + +``` +# seedrng +``` + +However, this invocation should generally come from init and shutdown scripts. + +### License + +This program is licensed under any one of the the following licenses, so that it can be incorporated into other software projects as needed: + + - GPL-2.0 + - Apache-2.0 + - MIT + - BSD-1-Clause + - CC0-1.0 diff --git a/pkgs/seedrng/default.nix b/pkgs/seedrng/default.nix new file mode 100644 index 0000000..973ed4a --- /dev/null +++ b/pkgs/seedrng/default.nix @@ -0,0 +1,13 @@ +{ stdenv }: +stdenv.mkDerivation { + pname = "seedrng"; + version = "2022.04"; + + src = ./.; + + makeFlags = [ + "PREFIX=${placeholder "out"}" + "SBINDIR=${placeholder "out"}/bin" + "LOCALSTATEDIR=/persist" + ]; +} diff --git a/pkgs/seedrng/seedrng.c b/pkgs/seedrng/seedrng.c new file mode 100644 index 0000000..9f93fe2 --- /dev/null +++ b/pkgs/seedrng/seedrng.c @@ -0,0 +1,488 @@ +// SPDX-License-Identifier: (GPL-2.0 OR Apache-2.0 OR MIT OR BSD-1-Clause OR CC0-1.0) +/* + * Copyright (C) 2022 Jason A. Donenfeld . All Rights Reserved. + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#ifndef LOCALSTATEDIR +#define LOCALSTATEDIR "/var/lib" +#endif + +#define SEED_DIR LOCALSTATEDIR "/seedrng" +#define CREDITABLE_SEED "seed.credit" +#define NON_CREDITABLE_SEED "seed.no-credit" + +enum blake2s_lengths { + BLAKE2S_BLOCK_LEN = 64, + BLAKE2S_HASH_LEN = 32, + BLAKE2S_KEY_LEN = 32 +}; + +enum seedrng_lengths { + MAX_SEED_LEN = 512, + MIN_SEED_LEN = BLAKE2S_HASH_LEN +}; + +struct blake2s_state { + uint32_t h[8]; + uint32_t t[2]; + uint32_t f[2]; + uint8_t buf[BLAKE2S_BLOCK_LEN]; + unsigned int buflen; + unsigned int outlen; +}; + +#define le32_to_cpup(a) le32toh(*(a)) +#define cpu_to_le32(a) htole32(a) +#ifndef ARRAY_SIZE +#define ARRAY_SIZE(x) (sizeof(x) / sizeof((x)[0])) +#endif +#ifndef DIV_ROUND_UP +#define DIV_ROUND_UP(n, d) (((n) + (d) - 1) / (d)) +#endif + +static inline void cpu_to_le32_array(uint32_t *buf, unsigned int words) +{ + while (words--) { + *buf = cpu_to_le32(*buf); + ++buf; + } +} + +static inline void le32_to_cpu_array(uint32_t *buf, unsigned int words) +{ + while (words--) { + *buf = le32_to_cpup(buf); + ++buf; + } +} + +static inline uint32_t ror32(uint32_t word, unsigned int shift) +{ + return (word >> (shift & 31)) | (word << ((-shift) & 31)); +} + +static const uint32_t blake2s_iv[8] = { + 0x6A09E667UL, 0xBB67AE85UL, 0x3C6EF372UL, 0xA54FF53AUL, + 0x510E527FUL, 0x9B05688CUL, 0x1F83D9ABUL, 0x5BE0CD19UL +}; + +static const uint8_t blake2s_sigma[10][16] = { + { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15 }, + { 14, 10, 4, 8, 9, 15, 13, 6, 1, 12, 0, 2, 11, 7, 5, 3 }, + { 11, 8, 12, 0, 5, 2, 15, 13, 10, 14, 3, 6, 7, 1, 9, 4 }, + { 7, 9, 3, 1, 13, 12, 11, 14, 2, 6, 5, 10, 4, 0, 15, 8 }, + { 9, 0, 5, 7, 2, 4, 10, 15, 14, 1, 11, 12, 6, 8, 3, 13 }, + { 2, 12, 6, 10, 0, 11, 8, 3, 4, 13, 7, 5, 15, 14, 1, 9 }, + { 12, 5, 1, 15, 14, 13, 4, 10, 0, 7, 6, 3, 9, 2, 8, 11 }, + { 13, 11, 7, 14, 12, 1, 3, 9, 5, 0, 15, 4, 8, 6, 2, 10 }, + { 6, 15, 14, 9, 11, 3, 0, 8, 12, 2, 13, 7, 1, 4, 10, 5 }, + { 10, 2, 8, 4, 7, 6, 1, 5, 15, 11, 9, 14, 3, 12, 13, 0 }, +}; + +static void blake2s_set_lastblock(struct blake2s_state *state) +{ + state->f[0] = -1; +} + +static void blake2s_increment_counter(struct blake2s_state *state, const uint32_t inc) +{ + state->t[0] += inc; + state->t[1] += (state->t[0] < inc); +} + +static void blake2s_init_param(struct blake2s_state *state, const uint32_t param) +{ + int i; + + memset(state, 0, sizeof(*state)); + for (i = 0; i < 8; ++i) + state->h[i] = blake2s_iv[i]; + state->h[0] ^= param; +} + +static void blake2s_init(struct blake2s_state *state, const size_t outlen) +{ + blake2s_init_param(state, 0x01010000 | outlen); + state->outlen = outlen; +} + +static void blake2s_compress(struct blake2s_state *state, const uint8_t *block, size_t nblocks, const uint32_t inc) +{ + uint32_t m[16]; + uint32_t v[16]; + int i; + + while (nblocks > 0) { + blake2s_increment_counter(state, inc); + memcpy(m, block, BLAKE2S_BLOCK_LEN); + le32_to_cpu_array(m, ARRAY_SIZE(m)); + memcpy(v, state->h, 32); + v[ 8] = blake2s_iv[0]; + v[ 9] = blake2s_iv[1]; + v[10] = blake2s_iv[2]; + v[11] = blake2s_iv[3]; + v[12] = blake2s_iv[4] ^ state->t[0]; + v[13] = blake2s_iv[5] ^ state->t[1]; + v[14] = blake2s_iv[6] ^ state->f[0]; + v[15] = blake2s_iv[7] ^ state->f[1]; + +#define G(r, i, a, b, c, d) do { \ + a += b + m[blake2s_sigma[r][2 * i + 0]]; \ + d = ror32(d ^ a, 16); \ + c += d; \ + b = ror32(b ^ c, 12); \ + a += b + m[blake2s_sigma[r][2 * i + 1]]; \ + d = ror32(d ^ a, 8); \ + c += d; \ + b = ror32(b ^ c, 7); \ +} while (0) + +#define ROUND(r) do { \ + G(r, 0, v[0], v[ 4], v[ 8], v[12]); \ + G(r, 1, v[1], v[ 5], v[ 9], v[13]); \ + G(r, 2, v[2], v[ 6], v[10], v[14]); \ + G(r, 3, v[3], v[ 7], v[11], v[15]); \ + G(r, 4, v[0], v[ 5], v[10], v[15]); \ + G(r, 5, v[1], v[ 6], v[11], v[12]); \ + G(r, 6, v[2], v[ 7], v[ 8], v[13]); \ + G(r, 7, v[3], v[ 4], v[ 9], v[14]); \ +} while (0) + ROUND(0); + ROUND(1); + ROUND(2); + ROUND(3); + ROUND(4); + ROUND(5); + ROUND(6); + ROUND(7); + ROUND(8); + ROUND(9); + +#undef G +#undef ROUND + + for (i = 0; i < 8; ++i) + state->h[i] ^= v[i] ^ v[i + 8]; + + block += BLAKE2S_BLOCK_LEN; + --nblocks; + } +} + +static void blake2s_update(struct blake2s_state *state, const void *inp, size_t inlen) +{ + const size_t fill = BLAKE2S_BLOCK_LEN - state->buflen; + const uint8_t *in = inp; + + if (!inlen) + return; + if (inlen > fill) { + memcpy(state->buf + state->buflen, in, fill); + blake2s_compress(state, state->buf, 1, BLAKE2S_BLOCK_LEN); + state->buflen = 0; + in += fill; + inlen -= fill; + } + if (inlen > BLAKE2S_BLOCK_LEN) { + const size_t nblocks = DIV_ROUND_UP(inlen, BLAKE2S_BLOCK_LEN); + blake2s_compress(state, in, nblocks - 1, BLAKE2S_BLOCK_LEN); + in += BLAKE2S_BLOCK_LEN * (nblocks - 1); + inlen -= BLAKE2S_BLOCK_LEN * (nblocks - 1); + } + memcpy(state->buf + state->buflen, in, inlen); + state->buflen += inlen; +} + +static void blake2s_final(struct blake2s_state *state, uint8_t *out) +{ + blake2s_set_lastblock(state); + memset(state->buf + state->buflen, 0, BLAKE2S_BLOCK_LEN - state->buflen); + blake2s_compress(state, state->buf, 1, state->buflen); + cpu_to_le32_array(state->h, ARRAY_SIZE(state->h)); + memcpy(out, state->h, state->outlen); +} + +static ssize_t getrandom_full(void *buf, size_t count, unsigned int flags) +{ + ssize_t ret, total = 0; + uint8_t *p = buf; + + do { + ret = getrandom(p, count, flags); + if (ret < 0 && errno == EINTR) + continue; + else if (ret < 0) + return ret; + total += ret; + p += ret; + count -= ret; + } while (count); + return total; +} + +static ssize_t read_full(int fd, void *buf, size_t count) +{ + ssize_t ret, total = 0; + uint8_t *p = buf; + + do { + ret = read(fd, p, count); + if (ret < 0 && errno == EINTR) + continue; + else if (ret < 0) + return ret; + else if (ret == 0) + break; + total += ret; + p += ret; + count -= ret; + } while (count); + return total; +} + +static ssize_t write_full(int fd, const void *buf, size_t count) +{ + ssize_t ret, total = 0; + const uint8_t *p = buf; + + do { + ret = write(fd, p, count); + if (ret < 0 && errno == EINTR) + continue; + else if (ret < 0) + return ret; + total += ret; + p += ret; + count -= ret; + } while (count); + return total; +} + +static size_t determine_optimal_seed_len(void) +{ + size_t ret = 0; + char poolsize_str[11] = { 0 }; + int fd = open("/proc/sys/kernel/random/poolsize", O_RDONLY); + + if (fd < 0 || read_full(fd, poolsize_str, sizeof(poolsize_str) - 1) < 0) { + perror("Unable to determine pool size, falling back to 256 bits"); + ret = MIN_SEED_LEN; + } else + ret = DIV_ROUND_UP(strtoul(poolsize_str, NULL, 10), 8); + if (fd >= 0) + close(fd); + if (ret < MIN_SEED_LEN) + ret = MIN_SEED_LEN; + else if (ret > MAX_SEED_LEN) + ret = MAX_SEED_LEN; + return ret; +} + +static int read_new_seed(uint8_t *seed, size_t len, bool *is_creditable) +{ + ssize_t ret; + int urandom_fd; + + *is_creditable = false; + ret = getrandom_full(seed, len, GRND_NONBLOCK); + if (ret == (ssize_t)len) { + *is_creditable = true; + return 0; + } else if (ret < 0 && errno == ENOSYS) { + struct pollfd random_fd = { + .fd = open("/dev/random", O_RDONLY), + .events = POLLIN + }; + if (random_fd.fd < 0) + return -errno; + *is_creditable = poll(&random_fd, 1, 0) == 1; + close(random_fd.fd); + } else if (getrandom_full(seed, len, GRND_INSECURE) == (ssize_t)len) + return 0; + urandom_fd = open("/dev/urandom", O_RDONLY); + if (urandom_fd < 0) + return -1; + ret = read_full(urandom_fd, seed, len); + if (ret == (ssize_t)len) + ret = 0; + else + ret = -errno ? -errno : -EIO; + close(urandom_fd); + errno = -ret; + return ret ? -1 : 0; +} + +static int seed_rng(uint8_t *seed, size_t len, bool credit) +{ + struct { + int entropy_count; + int buf_size; + uint8_t buffer[MAX_SEED_LEN]; + } req = { + .entropy_count = credit ? len * 8 : 0, + .buf_size = len + }; + int random_fd, ret; + + if (len > sizeof(req.buffer)) { + errno = EFBIG; + return -1; + } + memcpy(req.buffer, seed, len); + + random_fd = open("/dev/urandom", O_RDONLY); + if (random_fd < 0) + return -1; + ret = ioctl(random_fd, RNDADDENTROPY, &req); + if (ret) + ret = -errno ? -errno : -EIO; + close(random_fd); + errno = -ret; + return ret ? -1 : 0; +} + +static int seed_from_file_if_exists(const char *filename, int dfd, bool credit, struct blake2s_state *hash) +{ + uint8_t seed[MAX_SEED_LEN]; + ssize_t seed_len; + int fd = -1, ret = 0; + + fd = openat(dfd, filename, O_RDONLY); + if (fd < 0 && errno == ENOENT) + return 0; + else if (fd < 0) { + ret = -errno; + perror("Unable to open seed file"); + goto out; + } + seed_len = read_full(fd, seed, sizeof(seed)); + if (seed_len < 0) { + ret = -errno; + perror("Unable to read seed file"); + goto out; + } + if ((unlinkat(dfd, filename, 0) < 0 || fsync(dfd) < 0) && seed_len) { + ret = -errno; + perror("Unable to remove seed after reading, so not seeding"); + goto out; + } + if (!seed_len) + goto out; + + blake2s_update(hash, &seed_len, sizeof(seed_len)); + blake2s_update(hash, seed, seed_len); + + printf("Seeding %zd bits %s crediting\n", seed_len * 8, credit ? "and" : "without"); + if (seed_rng(seed, seed_len, credit) < 0) { + ret = -errno; + perror("Unable to seed"); + } + +out: + if (fd >= 0) + close(fd); + errno = -ret; + return ret ? -1 : 0; +} + +static bool skip_credit(void) +{ + const char *skip = getenv("SEEDRNG_SKIP_CREDIT"); + return skip && (!strcmp(skip, "1") || !strcasecmp(skip, "true") || + !strcasecmp(skip, "yes") || !strcasecmp(skip, "y")); +} + +int main(int argc __attribute__((unused)), char *argv[] __attribute__((unused))) +{ + static const char seedrng_prefix[] = "SeedRNG v1 Old+New Prefix"; + static const char seedrng_failure[] = "SeedRNG v1 No New Seed Failure"; + int fd = -1, dfd = -1, program_ret = 0; + uint8_t new_seed[MAX_SEED_LEN]; + size_t new_seed_len; + bool new_seed_creditable; + struct timespec realtime = { 0 }, boottime = { 0 }; + struct blake2s_state hash; + + umask(0077); + if (getuid()) { + errno = EACCES; + perror("This program requires root"); + return 1; + } + + blake2s_init(&hash, BLAKE2S_HASH_LEN); + blake2s_update(&hash, seedrng_prefix, strlen(seedrng_prefix)); + clock_gettime(CLOCK_REALTIME, &realtime); + clock_gettime(CLOCK_BOOTTIME, &boottime); + blake2s_update(&hash, &realtime, sizeof(realtime)); + blake2s_update(&hash, &boottime, sizeof(boottime)); + + if (mkdir(SEED_DIR, 0700) < 0 && errno != EEXIST) { + perror("Unable to create seed directory"); + return 1; + } + + dfd = open(SEED_DIR, O_DIRECTORY | O_RDONLY); + if (dfd < 0 || flock(dfd, LOCK_EX) < 0) { + perror("Unable to lock seed directory"); + program_ret = 1; + goto out; + } + + if (seed_from_file_if_exists(NON_CREDITABLE_SEED, dfd, false, &hash) < 0) + program_ret |= 1 << 1; + if (seed_from_file_if_exists(CREDITABLE_SEED, dfd, !skip_credit(), &hash) < 0) + program_ret |= 1 << 2; + + new_seed_len = determine_optimal_seed_len(); + if (read_new_seed(new_seed, new_seed_len, &new_seed_creditable) < 0) { + perror("Unable to read new seed"); + new_seed_len = BLAKE2S_HASH_LEN; + strncpy((char *)new_seed, seedrng_failure, new_seed_len); + program_ret |= 1 << 3; + } + blake2s_update(&hash, &new_seed_len, sizeof(new_seed_len)); + blake2s_update(&hash, new_seed, new_seed_len); + blake2s_final(&hash, new_seed + new_seed_len - BLAKE2S_HASH_LEN); + + printf("Saving %zu bits of %s seed for next boot\n", new_seed_len * 8, new_seed_creditable ? "creditable" : "non-creditable"); + fd = openat(dfd, NON_CREDITABLE_SEED, O_WRONLY | O_CREAT | O_TRUNC, 0400); + if (fd < 0) { + perror("Unable to open seed file for writing"); + program_ret |= 1 << 4; + goto out; + } + if (write_full(fd, new_seed, new_seed_len) != (ssize_t)new_seed_len || fsync(fd) < 0) { + perror("Unable to write seed file"); + program_ret |= 1 << 5; + goto out; + } + if (new_seed_creditable && renameat(dfd, NON_CREDITABLE_SEED, dfd, CREDITABLE_SEED) < 0) { + perror("Unable to make new seed creditable"); + program_ret |= 1 << 6; + } +out: + if (fd >= 0) + close(fd); + if (dfd >= 0) + close(dfd); + return program_ret; +}