diff options
Diffstat (limited to 'repo/system/openrc/seedrng.patch')
| -rw-r--r-- | repo/system/openrc/seedrng.patch | 640 |
1 files changed, 640 insertions, 0 deletions
diff --git a/repo/system/openrc/seedrng.patch b/repo/system/openrc/seedrng.patch new file mode 100644 index 0000000..ff61d81 --- /dev/null +++ b/repo/system/openrc/seedrng.patch @@ -0,0 +1,640 @@ +From 076c2552aeff88a27fe275dfaae61dedf4bb4bd5 Mon Sep 17 00:00:00 2001 +From: "Jason A. Donenfeld" <Jason@zx2c4.com> +Date: Thu, 24 Mar 2022 22:07:16 -0600 +Subject: [PATCH] Use seedrng for seeding the random number generator + +The RNG can't actually be seeded from a shell script, due to the +reliance on ioctls. For this reason, the seedrng project provides a +basic script meant to be copy and pasted into projects like OpenRC and +tweaked as needed: https://git.zx2c4.com/seedrng/about/ + +This commit imports it into OpenRC and wires up /etc/init.d/urandom to +call it. It shouldn't be called by other things on the system, so it +lives in rc_sbindir. + +Closes #506. +Closes #507. + +Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com> +--- + AUTHORS | 1 + + conf.d/urandom | 9 +- + init.d/urandom.in | 41 ++-- + src/rc/Makefile | 6 +- + src/rc/meson.build | 10 +- + src/rc/seedrng.c | 453 +++++++++++++++++++++++++++++++++++++++++++++ + 6 files changed, 499 insertions(+), 21 deletions(-) + create mode 100644 src/rc/seedrng.c + +diff --git a/AUTHORS b/AUTHORS +index 0616d5175..ede0f471b 100644 +--- a/AUTHORS ++++ b/AUTHORS +@@ -43,6 +43,7 @@ Ian Stakenvicius <axs@gentoo.org> + Jakob Drexel <jake42@rommel.stw.uni-erlangen.de> + James Le Cuirot <chewi@aura-online.co.uk> + Jan Psota <jasiu@belsznica.pl> ++Jason A. Donenfeld <Jason@zx2c4.com> + Jason Zaman <jason@perfinion.com> + Joe Harvell <jharvell@dogpad.net> + Joe M <joe9mail@gmail.com> +diff --git a/conf.d/urandom b/conf.d/urandom +index f721a2491..744e4f702 100644 +--- a/conf.d/urandom ++++ b/conf.d/urandom +@@ -2,4 +2,11 @@ + # (say for crypt swap), so you will need to customize this + # behavior. If you have /var on a separate partition, then + # make sure this path lives on your root device somewhere. +-urandom_seed="/var/lib/misc/random-seed" ++seed_dir="/var/lib/seedrng" ++lock_file="/var/run/seedrng.lock" ++ ++# Set this to true if you do not want seed files to actually ++# credit the RNG. Set this if you plan to replicate this ++# file system image and do not have the wherewithal to first ++# delete the contents of /var/lib/seedrng. ++skip_credit="false" +diff --git a/init.d/urandom.in b/init.d/urandom.in +index 0d6ab66e0..cda431fdb 100644 +--- a/init.d/urandom.in ++++ b/init.d/urandom.in +@@ -1,5 +1,5 @@ + #!@SBINDIR@/openrc-run +-# Copyright (c) 2007-2015 The OpenRC Authors. ++# Copyright (c) 2007-2022 The OpenRC Authors. + # See the Authors file at the top-level directory of this distribution and + # https://github.com/OpenRC/openrc/blob/HEAD/AUTHORS + # +@@ -9,7 +9,10 @@ + # This file may not be copied, modified, propagated, or distributed + # except according to the terms contained in the LICENSE file. + +-: ${urandom_seed:=${URANDOM_SEED:-/var/lib/misc/random-seed}} ++export SEEDRNG_SEED_DIR="${seed_dir:-/var/lib/seedrng}" ++export SEEDRNG_LOCK_FILE="${lock_file:-/var/run/seedrng.lock}" ++export SEEDRNG_SKIP_CREDIT="${skip_credit:-false}" ++: ${urandom_seed:=${SEEDRNG_SEED_DIR}/../misc/random-seed} + description="Initializes the random number generator." + + depend() +@@ -21,33 +24,35 @@ depend() + + save_seed() + { +- local psz=1 +- +- if [ -e /proc/sys/kernel/random/poolsize ]; then +- : $(( psz = $(cat /proc/sys/kernel/random/poolsize) / 4096 )) +- fi +- + ( # sub shell to prevent umask pollution + umask 077 +- dd if=/dev/urandom of="$urandom_seed" count=${psz} 2>/dev/null ++ dd if=/dev/urandom of="$urandom_seed" count=1 2>/dev/null + ) + } + + start() + { +- [ -c /dev/urandom ] || return +- if [ -f "$urandom_seed" ]; then +- ebegin "Initializing random number generator" +- cat "$urandom_seed" > /dev/urandom +- eend $? "Error initializing random number generator" ++ if [ "$RC_UNAME" = Linux ]; then ++ seedrng ++ else ++ [ -c /dev/urandom ] || return ++ if [ -f "$urandom_seed" ]; then ++ ebegin "Initializing random number generator" ++ cat "$urandom_seed" > /dev/urandom ++ eend $? "Error initializing random number generator" ++ fi ++ rm -f "$urandom_seed" && save_seed + fi +- rm -f "$urandom_seed" && save_seed + return 0 + } + + stop() + { +- ebegin "Saving random seed" +- save_seed +- eend $? "Failed to save random seed" ++ if [ "$RC_UNAME" = Linux ]; then ++ seedrng ++ else ++ ebegin "Saving random seed" ++ save_seed ++ eend $? "Failed to save random seed" ++ fi + } +diff --git a/src/rc/Makefile b/src/rc/Makefile +index fd796d920..62539f134 100644 +--- a/src/rc/Makefile ++++ b/src/rc/Makefile +@@ -15,7 +15,7 @@ endif + + ifeq (${OS},Linux) + SRCS+= kill_all.c openrc-init.c openrc-shutdown.c rc-sysvinit.c broadcast.c \ +- rc-wtmp.c ++ rc-wtmp.c seedrng.c + endif + + CLEANFILES= version.h rc-selinux.o +@@ -47,6 +47,7 @@ RC_SBINPROGS= mark_service_starting mark_service_started \ + + ifeq (${OS},Linux) + RC_BINPROGS+= kill_all ++RC_SBINPROGS+= seedrng + SBINPROGS+= openrc-init openrc-shutdown + endif + +@@ -180,3 +181,6 @@ shell_var: shell_var.o + + swclock: swclock.o _usage.o rc-misc.o + ${CC} ${LOCAL_CFLAGS} ${LOCAL_LDFLAGS} ${CFLAGS} ${LDFLAGS} -o $@ $^ ${LDADD} ++ ++seedrng: seedrng.o ++ ${CC} ${LOCAL_CFLAGS} ${LOCAL_LDFLAGS} ${CFLAGS} ${LDFLAGS} -o $@ $^ ${LDADD} +diff --git a/src/rc/meson.build b/src/rc/meson.build +index 8fdf3ac3b..b724c51f2 100644 +--- a/src/rc/meson.build ++++ b/src/rc/meson.build +@@ -268,7 +268,15 @@ if os == 'Linux' + link_with: [libeinfo,librc], + install: true, + install_dir: rc_bindir) +- endif ++ ++ executable('seedrng', ++ ['seedrng.c'], ++ c_args : cc_branding_flags, ++ include_directories: [incdir, einfo_incdir, rc_incdir], ++ link_with: [libeinfo, librc], ++ install: true, ++ install_dir: rc_sbindir) ++endif + + executable('shell_var', + ['shell_var.c'], +diff --git a/src/rc/seedrng.c b/src/rc/seedrng.c +new file mode 100644 +index 000000000..c1f941457 +--- /dev/null ++++ b/src/rc/seedrng.c +@@ -0,0 +1,453 @@ ++/* ++ * seedrng.c ++ * Seed kernel RNG from seed file, based on code from: ++ * https://git.zx2c4.com/seedrng/about/ ++ */ ++ ++/* ++ * Copyright (c) 2022 The OpenRC Authors. ++ * See the Authors file at the top-level directory of this distribution and ++ * https://github.com/OpenRC/openrc/blob/HEAD/AUTHORS ++ * ++ * This file is part of OpenRC. It is subject to the license terms in ++ * the LICENSE file found in the top-level directory of this ++ * distribution and at https://github.com/OpenRC/openrc/blob/HEAD/LICENSE ++ * This file may not be copied, modified, propagated, or distributed ++ * except according to the terms contained in the LICENSE file. ++ */ ++ ++#include <linux/random.h> ++#include <sys/random.h> ++#include <sys/ioctl.h> ++#include <sys/file.h> ++#include <sys/stat.h> ++#include <sys/types.h> ++#include <fcntl.h> ++#include <poll.h> ++#include <unistd.h> ++#include <time.h> ++#include <errno.h> ++#include <endian.h> ++#include <stdbool.h> ++#include <stdint.h> ++#include <string.h> ++#include <stdio.h> ++#include <stdlib.h> ++ ++#include "rc.h" ++#include "einfo.h" ++#include "helpers.h" ++ ++#ifndef GRND_INSECURE ++#define GRND_INSECURE 0x0004 /* Apparently some headers don't ship with this yet. */ ++#endif ++ ++static const char *SEED_DIR; ++static const char *LOCK_FILE; ++static char *CREDITABLE_SEED; ++static char *NON_CREDITABLE_SEED; ++ ++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 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(fd, poolsize_str, sizeof(poolsize_str) - 1) < 0) { ++ ewarn("Unable to determine pool size, falling back to %u bits: %s", MIN_SEED_LEN * 8, strerror(errno)); ++ 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(seed, len, GRND_NONBLOCK); ++ if (ret == (ssize_t)len) { ++ *is_creditable = true; ++ return 0; ++ } ++ if (ret == -1 && 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(seed, len, GRND_INSECURE) == (ssize_t)len) ++ return 0; ++ urandom_fd = open("/dev/urandom", O_RDONLY); ++ if (urandom_fd < 0) ++ return -errno; ++ ret = read(urandom_fd, seed, len); ++ if (ret == (ssize_t)len) ++ ret = 0; ++ else ++ ret = -errno ? -errno : -EIO; ++ close(urandom_fd); ++ return ret; ++} ++ ++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)) ++ return -EFBIG; ++ memcpy(req.buffer, seed, len); ++ ++ random_fd = open("/dev/random", O_RDWR); ++ if (random_fd < 0) ++ return -errno; ++ ret = ioctl(random_fd, RNDADDENTROPY, &req); ++ if (ret) ++ ret = -errno ? -errno : -EIO; ++ close(random_fd); ++ return ret; ++} ++ ++static int seed_from_file_if_exists(const char *filename, bool credit, struct blake2s_state *hash) ++{ ++ uint8_t seed[MAX_SEED_LEN]; ++ ssize_t seed_len; ++ int fd, dfd, ret = 0; ++ ++ fd = open(filename, O_RDONLY); ++ if (fd < 0 && errno == ENOENT) ++ return 0; ++ else if (fd < 0) { ++ ret = -errno; ++ eerror("Unable to open seed file: %s", strerror(errno)); ++ return ret; ++ } ++ dfd = open(SEED_DIR, O_DIRECTORY | O_RDONLY); ++ if (dfd < 0) { ++ ret = -errno; ++ close(fd); ++ eerror("Unable to open seed directory: %s", strerror(errno)); ++ return ret; ++ } ++ seed_len = read(fd, seed, sizeof(seed)); ++ if (seed_len < 0) { ++ ret = -errno; ++ eerror("Unable to read seed file: %s", strerror(errno)); ++ } ++ close(fd); ++ if (ret) { ++ close(dfd); ++ return ret; ++ } ++ if ((unlink(filename) < 0 || fsync(dfd) < 0) && seed_len) { ++ ret = -errno; ++ eerror("Unable to remove seed after reading, so not seeding: %s", strerror(errno)); ++ } ++ close(dfd); ++ if (ret) ++ return ret; ++ if (!seed_len) ++ return 0; ++ ++ blake2s_update(hash, &seed_len, sizeof(seed_len)); ++ blake2s_update(hash, seed, seed_len); ++ ++ einfo("Seeding %zd bits %s crediting", seed_len * 8, credit ? "and" : "without"); ++ ret = seed_rng(seed, seed_len, credit); ++ if (ret < 0) ++ eerror("Unable to seed: %s", strerror(-ret)); ++ return ret; ++} ++ ++static void populate_global_paths(void) ++{ ++ SEED_DIR = getenv("SEEDRNG_SEED_DIR"); ++ if (!SEED_DIR || !*SEED_DIR) ++ SEED_DIR = "/var/lib/seedrng"; ++ LOCK_FILE = getenv("SEEDRNG_LOCK_FILE"); ++ if (!LOCK_FILE || !*LOCK_FILE) ++ LOCK_FILE = "/var/run/seedrng.lock"; ++ xasprintf(&CREDITABLE_SEED, "%s/seed.credit", SEED_DIR); ++ xasprintf(&NON_CREDITABLE_SEED, "%s/seed.no-credit", SEED_DIR); ++} ++ ++int main(int argc _unused, char *argv[] _unused) ++{ ++ static const char seedrng_prefix[] = "SeedRNG v1 Old+New Prefix"; ++ static const char seedrng_failure[] = "SeedRNG v1 No New Seed Failure"; ++ int ret, fd, lock, 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()) ++ eerrorx("This rc helper program requires root"); ++ ++ populate_global_paths(); ++ 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) ++ eerrorx("Unable to create \"%s\" directory: %s", SEED_DIR, strerror(errno)); ++ ++ lock = open(LOCK_FILE, O_WRONLY | O_CREAT, 0000); ++ if (lock < 0 || flock(lock, LOCK_EX) < 0) ++ eerrorx("Unable to open lock file: %s", strerror(errno)); ++ ++ ret = seed_from_file_if_exists(NON_CREDITABLE_SEED, false, &hash); ++ if (ret < 0) ++ program_ret |= 1 << 1; ++ ret = seed_from_file_if_exists(CREDITABLE_SEED, !rc_yesno(getenv("SEEDRNG_SKIP_CREDIT")), &hash); ++ if (ret < 0) ++ program_ret |= 1 << 2; ++ ++ new_seed_len = determine_optimal_seed_len(); ++ ret = read_new_seed(new_seed, new_seed_len, &new_seed_creditable); ++ if (ret < 0) { ++ eerror("Unable to read new seed: %s", strerror(-ret)); ++ 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); ++ ++ einfo("Saving %zu bits of %s seed for next boot", new_seed_len * 8, new_seed_creditable ? "creditable" : "non-creditable"); ++ fd = open(NON_CREDITABLE_SEED, O_WRONLY | O_CREAT | O_TRUNC, 0400); ++ if (fd < 0) { ++ eerror("Unable to open seed file for writing: %s", strerror(errno)); ++ program_ret |= 1 << 4; ++ goto out; ++ } ++ if (write(fd, new_seed, new_seed_len) != (ssize_t)new_seed_len || fsync(fd) < 0) { ++ eerror("Unable to write seed file: %s", strerror(errno)); ++ program_ret |= 1 << 5; ++ goto out; ++ } ++ if (new_seed_creditable && rename(NON_CREDITABLE_SEED, CREDITABLE_SEED) < 0) { ++ ewarn("Unable to make new seed creditable: %s", strerror(errno)); ++ program_ret |= 1 << 6; ++ } ++out: ++ close(fd); ++ close(lock); ++ return program_ret; ++} |