diff options
Diffstat (limited to 'extra/openrc/seedrng.patch')
| -rw-r--r-- | extra/openrc/seedrng.patch | 640 |
1 files changed, 0 insertions, 640 deletions
diff --git a/extra/openrc/seedrng.patch b/extra/openrc/seedrng.patch deleted file mode 100644 index ff61d81..0000000 --- a/extra/openrc/seedrng.patch +++ /dev/null @@ -1,640 +0,0 @@ -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; -+} |