diff options
Diffstat (limited to 'source/a')
| -rwxr-xr-x | source/a/haveged/haveged.SlackBuild | 6 | ||||
| -rw-r--r-- | source/a/sysvinit-scripts/scripts/rc.6 | 31 | ||||
| -rw-r--r-- | source/a/sysvinit-scripts/scripts/rc.S | 55 | ||||
| -rwxr-xr-x | source/a/sysvinit-scripts/sysvinit-scripts.SlackBuild | 4 | ||||
| -rw-r--r-- | source/a/util-linux/seedrng.8 | 41 | ||||
| -rw-r--r-- | source/a/util-linux/seedrng.c | 441 | ||||
| -rwxr-xr-x | source/a/util-linux/util-linux.SlackBuild | 6 |
7 files changed, 563 insertions, 21 deletions
diff --git a/source/a/haveged/haveged.SlackBuild b/source/a/haveged/haveged.SlackBuild index 4d7967153..163a271c1 100755 --- a/source/a/haveged/haveged.SlackBuild +++ b/source/a/haveged/haveged.SlackBuild @@ -1,7 +1,7 @@ #!/bin/sh # # Copyright 2014 Erik Falor, West Valley City, Utah, USA -# Copyright 2018, 2020, 2021 Patrick J. Volkerding, Sebeka, Minnesota, USA +# Copyright 2018, 2020, 2021, 2022 Patrick J. Volkerding, Sebeka, Minnesota, USA # All rights reserved. # # Redistribution and use of this script, with or without modification, is @@ -25,7 +25,7 @@ cd $(dirname $0) ; CWD=$(pwd) PKGNAM=haveged VERSION=${VERSION:-$(echo $PKGNAM-*.tar.?z | rev | cut -f 3- -d . | cut -f 1 -d - | rev)} -BUILD=${BUILD:-1} +BUILD=${BUILD:-2} if [ -z "$ARCH" ]; then case "$( uname -m )" in @@ -102,7 +102,7 @@ find $PKG -print0 | xargs -0 file | grep -e "executable" -e "shared object" | gr mkdir -p $PKG/etc/rc.d cat $CWD/rc.haveged > $PKG/etc/rc.d/rc.haveged.new -chmod 755 $PKG/etc/rc.d/rc.haveged.new +chmod 644 $PKG/etc/rc.d/rc.haveged.new find $PKG/usr/man -type f -exec gzip -9 {} \+ for i in $( find $PKG/usr/man -type l ) ; do ln -s $( readlink $i ).gz $i.gz ; rm $i ; done diff --git a/source/a/sysvinit-scripts/scripts/rc.6 b/source/a/sysvinit-scripts/scripts/rc.6 index 383c5490b..1ebe12b69 100644 --- a/source/a/sysvinit-scripts/scripts/rc.6 +++ b/source/a/sysvinit-scripts/scripts/rc.6 @@ -218,15 +218,32 @@ if /bin/grep -q quota /etc/fstab ; then fi # Carry a random seed between reboots. +# Doing this properly requires the seedrng utility. if [ -z "$container" ]; then - echo "Saving random seed from /dev/urandom in /etc/random-seed." - # Use the pool size from /proc, or 4096 bits: - if [ -r /proc/sys/kernel/random/poolsize ]; then - /bin/dd if=/dev/urandom of=/etc/random-seed count=1 bs=$(expr $(cat /proc/sys/kernel/random/poolsize) / 8) 2> /dev/null - else - /bin/dd if=/dev/urandom of=/etc/random-seed count=1 bs=512 2> /dev/null + # Any old seed that exists here shall be deemed useless: + if [ -f /etc/random-seed ]; then + rm -f /etc/random-seed + fi + if [ -x /usr/sbin/seedrng ]; then + /usr/sbin/seedrng + else # we have to fall back on the old method: + # Make sure the new seed storage directory exists: + if [ ! -d /var/lib/seedrng ]; then + mkdir -p /var/lib/seedrng + chmod 700 /var/lib/seedrng + fi + echo "The SeedRNG utility was not found. Generating a non-creditable and" + echo "inferior RNG seed: /var/lib/seedrng/seed.no-credit" + # To get a seed that matches the pool size, we'll use dd. This assumes that + # by the time the machine was shut down that the kernel had generated nearly + # a full entropy pool, but there is no guarantee of this. + if [ -r /proc/sys/kernel/random/poolsize ]; then + /bin/dd if=/dev/urandom of=/var/lib/seedrng/seed.no-credit count=1 bs=$(expr $(cat /proc/sys/kernel/random/poolsize) / 8) 2> /dev/null + else + /bin/dd if=/dev/urandom of=/var/lib/seedrng/seed.no-credit count=1 bs=512 2> /dev/null + fi + /bin/chmod 400 /var/lib/seedrng/seed.no-credit fi - /bin/chmod 600 /etc/random-seed fi # Before unmounting file systems write a reboot or halt record to wtmp. diff --git a/source/a/sysvinit-scripts/scripts/rc.S b/source/a/sysvinit-scripts/scripts/rc.S index 5dfa72c5c..c49140616 100644 --- a/source/a/sysvinit-scripts/scripts/rc.S +++ b/source/a/sysvinit-scripts/scripts/rc.S @@ -463,16 +463,55 @@ if [ -x /etc/rc.d/rc.serial -a -z "$container" ]; then fi # Carry an entropy pool between reboots to improve randomness. +# To do this properly, we need to utilize the "seedrng" utility, since that +# supports the ioctls in recent kernels that allow the RNG to be initialized +# after seeding. Otherwise using the script methods that were previously +# recommended in the kernel source, it could take a long time for entropy +# written to /dev/urandom to actually add to the entropy, and the new seed +# that's output immediately afterward might actually have less entropy. This +# would only be an issue in case a power failure occured before a proper +# shutdown, or if a proper shutdown happened before enough time had gone by +# to generate good entropy. We'll favor using seedrng, but if it's missing +# (shouldn't be) then we'll fall back on using the script method. if [ -z "$container" ]; then + # Make sure the new seed storage directory exists: + if [ ! -d /var/lib/seedrng ]; then + mkdir -p /var/lib/seedrng + chmod 700 /var/lib/seedrng + fi + # If the old /etc/random-seed exists and no seedrng-generated seeds exist, + # then we might as well use it for non-creditable entropy: if [ -f /etc/random-seed ]; then - echo "Using /etc/random-seed to initialize /dev/urandom." - cat /etc/random-seed > /dev/urandom + if ! /bin/ls /var/lib/seedrng/seed.* 1> /dev/null 2> /dev/null ; then + echo "Moving /etc/random-seed to /var/lib/seedrng/seed.no-credit." + mv /etc/random-seed /var/lib/seedrng/seed.no-credit + chmod 400 /var/lib/seedrng/seed.no-credit + fi fi - # Use the pool size from /proc, or 4096 bits: - if [ -r /proc/sys/kernel/random/poolsize ]; then - dd if=/dev/urandom of=/etc/random-seed count=1 bs=$(expr $(cat /proc/sys/kernel/random/poolsize) / 8) 2> /dev/null - else - dd if=/dev/urandom of=/etc/random-seed count=1 bs=512 2> /dev/null + # If we have the seedrng utility, we will use it to initialize the RNG: + if [ -x /usr/sbin/seedrng ]; then + /usr/sbin/seedrng + else # we have to fall back on the old method: + if ! /bin/ls /var/lib/seedrng/seed.* 1> /dev/null 2> /dev/null ; then + echo "WARNING: no usable RNG seed was found in /var/lib/seedrng." + else + echo "The SeedRNG utility was not found. Seeding the RNG with an inferior method." + SEED="$(cat /var/lib/seedrng/seed.* | base64)" + rm -f /var/lib/seedrng/seed.* + sync /var/lib/seedrng + echo "$SEED" | base64 -d > /dev/urandom + # The seed saved below isn't going to be as large as the pool size, but + # it would only be used if the power fails before a proper shutdown is + # done. Nevertheless we'll try to get a little entropy saved from our + # previous seed(s) plus some bits from /dev/urandom (which *might* have + # some additional entropy in it). It's probably better than nothing. + echo "Saving a new uncreditable seed: /var/lib/seedrng/seed.no-credit" + { + head -c 512 /dev/urandom + echo "$SEED" | base64 -d + } | sha256sum | cut -d ' ' -f 1 > /var/lib/seedrng/seed.no-credit + chmod 400 /var/lib/seedrng/seed.no-credit + unset SEED + fi fi - chmod 600 /etc/random-seed fi diff --git a/source/a/sysvinit-scripts/sysvinit-scripts.SlackBuild b/source/a/sysvinit-scripts/sysvinit-scripts.SlackBuild index 090af12e5..17e0dd5ce 100755 --- a/source/a/sysvinit-scripts/sysvinit-scripts.SlackBuild +++ b/source/a/sysvinit-scripts/sysvinit-scripts.SlackBuild @@ -1,6 +1,6 @@ #!/bin/bash -# Copyright 2005-2018 Patrick J. Volkerding, Sebeka, MN, USA +# Copyright 2005-2022 Patrick J. Volkerding, Sebeka, MN, USA # All rights reserved. # # Redistribution and use of this script, with or without modification, is @@ -25,7 +25,7 @@ cd $(dirname $0) ; CWD=$(pwd) PKGNAM=sysvinit-scripts VERSION=${VERSION:-15.0} ARCH=noarch -BUILD=${BUILD:-9} +BUILD=${BUILD:-10} # If the variable PRINT_PACKAGE_NAME is set, then this script will report what # the name of the created package would be, and then exit. This information diff --git a/source/a/util-linux/seedrng.8 b/source/a/util-linux/seedrng.8 new file mode 100644 index 000000000..79ab81fd0 --- /dev/null +++ b/source/a/util-linux/seedrng.8 @@ -0,0 +1,41 @@ +.TH seedrng 8 +.SH NAME +seedrng \- seed the Linux kernel random number generator +.SH SYNOPSIS +.B seedrng +.SH DESCRIPTION +.B SeedRNG +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: + +.BR +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 /var/lib/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. + +.SH FILES +.IR /var/lib/seedrng/seed.credit +.IR /var/lib/seedrng/seed.no-credit +.SH AUTHOR +Jason A. Donenfeld <Jason@zx2c4.com> diff --git a/source/a/util-linux/seedrng.c b/source/a/util-linux/seedrng.c new file mode 100644 index 000000000..852ed48c3 --- /dev/null +++ b/source/a/util-linux/seedrng.c @@ -0,0 +1,441 @@ +// 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 <Jason@zx2c4.com>. All Rights Reserved. + */ + +#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> + +#ifndef LOCALSTATEDIR +#define LOCALSTATEDIR "/var/lib" +#endif +#ifndef RUNSTATEDIR +#define RUNSTATEDIR "/var/run" +#endif + +#define SEED_DIR LOCALSTATEDIR "/seedrng" +#define CREDITABLE_SEED SEED_DIR "/seed.credit" +#define NON_CREDITABLE_SEED SEED_DIR "/seed.no-credit" +#define LOCK_FILE RUNSTATEDIR "/seedrng.lock" + +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) { + fprintf(stderr, "WARNING: Unable to determine pool size, falling back to %u bits: %s\n", 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; + } 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(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; + fprintf(stderr, "ERROR: Unable to open seed file: %s\n", strerror(errno)); + return ret; + } + dfd = open(SEED_DIR, O_DIRECTORY | O_RDONLY); + if (dfd < 0) { + ret = -errno; + close(fd); + fprintf(stderr, "ERROR: Unable to open seed directory: %s\n", strerror(errno)); + return ret; + } + seed_len = read(fd, seed, sizeof(seed)); + if (seed_len < 0) { + ret = -errno; + fprintf(stderr, "ERROR: Unable to read seed file: %s\n", strerror(errno)); + } + close(fd); + if (ret) { + close(dfd); + return ret; + } + if ((unlink(filename) < 0 || fsync(dfd) < 0) && seed_len) { + ret = -errno; + fprintf(stderr, "ERROR: Unable to remove seed after reading, so not seeding: %s\n", 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); + + fprintf(stdout, "Seeding %zd bits %s crediting\n", seed_len * 8, credit ? "and" : "without"); + ret = seed_rng(seed, seed_len, credit); + if (ret < 0) + fprintf(stderr, "ERROR: Unable to seed: %s\n", strerror(-ret)); + return ret; +} + +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 ret, fd = -1, 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()) { + fprintf(stderr, "ERROR: This program requires root\n"); + 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) { + fprintf(stderr, "ERROR: Unable to create \"%s\" directory: %s\n", SEED_DIR, strerror(errno)); + return 1; + } + + lock = open(LOCK_FILE, O_WRONLY | O_CREAT, 0000); + if (lock < 0 || flock(lock, LOCK_EX) < 0) { + fprintf(stderr, "ERROR: Unable to open lock file: %s\n", strerror(errno)); + program_ret = 1; + goto out; + } + + 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, !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) { + fprintf(stderr, "ERROR: Unable to read new seed: %s\n", 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); + + fprintf(stdout, "Saving %zu bits of %s seed for next boot\n", 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) { + fprintf(stderr, "ERROR: Unable to open seed file for writing: %s\n", strerror(errno)); + program_ret |= 1 << 4; + goto out; + } + if (write(fd, new_seed, new_seed_len) != (ssize_t)new_seed_len || fsync(fd) < 0) { + fprintf(stderr, "ERROR: Unable to write seed file: %s\n", strerror(errno)); + program_ret |= 1 << 5; + goto out; + } + if (new_seed_creditable && rename(NON_CREDITABLE_SEED, CREDITABLE_SEED) < 0) { + fprintf(stderr, "WARNING: Unable to make new seed creditable: %s\n", strerror(errno)); + program_ret |= 1 << 6; + } +out: + if (fd >= 0) + close(fd); + if (lock >= 0) + close(lock); + return program_ret; +} diff --git a/source/a/util-linux/util-linux.SlackBuild b/source/a/util-linux/util-linux.SlackBuild index 22ff3e4d9..7ea3dfdbb 100755 --- a/source/a/util-linux/util-linux.SlackBuild +++ b/source/a/util-linux/util-linux.SlackBuild @@ -26,7 +26,7 @@ cd $(dirname $0) ; CWD=$(pwd) PKGNAM=util-linux VERSION=${VERSION:-$(echo util-linux*.tar.xz | cut -d - -f 3 | rev | cut -f 3- -d . | rev)} -BUILD=${BUILD:-1} +BUILD=${BUILD:-2} ADJTIMEXVERS=1.29 SETSERIALVERS=2.17 @@ -310,6 +310,10 @@ cat rc.serial > $PKG/etc/rc.d/rc.serial.new cat serial.conf > $PKG/etc/serial.conf.new cat setserial.8 | gzip -9c > $PKG/usr/man/man8/setserial.8.gz +# Build seedrng, a utility for seeding the kernel random number generator: +gcc -O2 -std=gnu99 $CWD/seedrng.c -o $PKG/usr/sbin/seedrng +zcat $CWD/seedrng.8.gz > $PKG/usr/man/man8/seedrng.8 + # These have always traditionally been available before /usr # might be mounted: ( cd $PKG/usr/bin |