diff options
Diffstat (limited to 'src/journal/journal-authenticate.c')
| -rw-r--r-- | src/journal/journal-authenticate.c | 551 |
1 files changed, 0 insertions, 551 deletions
diff --git a/src/journal/journal-authenticate.c b/src/journal/journal-authenticate.c deleted file mode 100644 index d8af113d3f..0000000000 --- a/src/journal/journal-authenticate.c +++ /dev/null @@ -1,551 +0,0 @@ -/*** - This file is part of systemd. - - Copyright 2012 Lennart Poettering - - systemd is free software; you can redistribute it and/or modify it - under the terms of the GNU Lesser General Public License as published by - the Free Software Foundation; either version 2.1 of the License, or - (at your option) any later version. - - systemd is distributed in the hope that it will be useful, but - WITHOUT ANY WARRANTY; without even the implied warranty of - MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU - Lesser General Public License for more details. - - You should have received a copy of the GNU Lesser General Public License - along with systemd; If not, see <http://www.gnu.org/licenses/>. -***/ - -#include <fcntl.h> -#include <sys/mman.h> - -#include "fd-util.h" -#include "fsprg.h" -#include "gcrypt-util.h" -#include "hexdecoct.h" -#include "journal-authenticate.h" -#include "journal-def.h" -#include "journal-file.h" - -static uint64_t journal_file_tag_seqnum(JournalFile *f) { - uint64_t r; - - assert(f); - - r = le64toh(f->header->n_tags) + 1; - f->header->n_tags = htole64(r); - - return r; -} - -int journal_file_append_tag(JournalFile *f) { - Object *o; - uint64_t p; - int r; - - assert(f); - - if (!f->seal) - return 0; - - if (!f->hmac_running) - return 0; - - assert(f->hmac); - - r = journal_file_append_object(f, OBJECT_TAG, sizeof(struct TagObject), &o, &p); - if (r < 0) - return r; - - o->tag.seqnum = htole64(journal_file_tag_seqnum(f)); - o->tag.epoch = htole64(FSPRG_GetEpoch(f->fsprg_state)); - - log_debug("Writing tag %"PRIu64" for epoch %"PRIu64"", - le64toh(o->tag.seqnum), - FSPRG_GetEpoch(f->fsprg_state)); - - /* Add the tag object itself, so that we can protect its - * header. This will exclude the actual hash value in it */ - r = journal_file_hmac_put_object(f, OBJECT_TAG, o, p); - if (r < 0) - return r; - - /* Get the HMAC tag and store it in the object */ - memcpy(o->tag.tag, gcry_md_read(f->hmac, 0), TAG_LENGTH); - f->hmac_running = false; - - return 0; -} - -int journal_file_hmac_start(JournalFile *f) { - uint8_t key[256 / 8]; /* Let's pass 256 bit from FSPRG to HMAC */ - assert(f); - - if (!f->seal) - return 0; - - if (f->hmac_running) - return 0; - - /* Prepare HMAC for next cycle */ - gcry_md_reset(f->hmac); - FSPRG_GetKey(f->fsprg_state, key, sizeof(key), 0); - gcry_md_setkey(f->hmac, key, sizeof(key)); - - f->hmac_running = true; - - return 0; -} - -static int journal_file_get_epoch(JournalFile *f, uint64_t realtime, uint64_t *epoch) { - uint64_t t; - - assert(f); - assert(epoch); - assert(f->seal); - - if (f->fss_start_usec == 0 || - f->fss_interval_usec == 0) - return -EOPNOTSUPP; - - if (realtime < f->fss_start_usec) - return -ESTALE; - - t = realtime - f->fss_start_usec; - t = t / f->fss_interval_usec; - - *epoch = t; - return 0; -} - -static int journal_file_fsprg_need_evolve(JournalFile *f, uint64_t realtime) { - uint64_t goal, epoch; - int r; - assert(f); - - if (!f->seal) - return 0; - - r = journal_file_get_epoch(f, realtime, &goal); - if (r < 0) - return r; - - epoch = FSPRG_GetEpoch(f->fsprg_state); - if (epoch > goal) - return -ESTALE; - - return epoch != goal; -} - -int journal_file_fsprg_evolve(JournalFile *f, uint64_t realtime) { - uint64_t goal, epoch; - int r; - - assert(f); - - if (!f->seal) - return 0; - - r = journal_file_get_epoch(f, realtime, &goal); - if (r < 0) - return r; - - epoch = FSPRG_GetEpoch(f->fsprg_state); - if (epoch < goal) - log_debug("Evolving FSPRG key from epoch %"PRIu64" to %"PRIu64".", epoch, goal); - - for (;;) { - if (epoch > goal) - return -ESTALE; - if (epoch == goal) - return 0; - - FSPRG_Evolve(f->fsprg_state); - epoch = FSPRG_GetEpoch(f->fsprg_state); - } -} - -int journal_file_fsprg_seek(JournalFile *f, uint64_t goal) { - void *msk; - uint64_t epoch; - - assert(f); - - if (!f->seal) - return 0; - - assert(f->fsprg_seed); - - if (f->fsprg_state) { - /* Cheaper... */ - - epoch = FSPRG_GetEpoch(f->fsprg_state); - if (goal == epoch) - return 0; - - if (goal == epoch+1) { - FSPRG_Evolve(f->fsprg_state); - return 0; - } - } else { - f->fsprg_state_size = FSPRG_stateinbytes(FSPRG_RECOMMENDED_SECPAR); - f->fsprg_state = malloc(f->fsprg_state_size); - - if (!f->fsprg_state) - return -ENOMEM; - } - - log_debug("Seeking FSPRG key to %"PRIu64".", goal); - - msk = alloca(FSPRG_mskinbytes(FSPRG_RECOMMENDED_SECPAR)); - FSPRG_GenMK(msk, NULL, f->fsprg_seed, f->fsprg_seed_size, FSPRG_RECOMMENDED_SECPAR); - FSPRG_Seek(f->fsprg_state, goal, msk, f->fsprg_seed, f->fsprg_seed_size); - return 0; -} - -int journal_file_maybe_append_tag(JournalFile *f, uint64_t realtime) { - int r; - - assert(f); - - if (!f->seal) - return 0; - - if (realtime <= 0) - realtime = now(CLOCK_REALTIME); - - r = journal_file_fsprg_need_evolve(f, realtime); - if (r <= 0) - return 0; - - r = journal_file_append_tag(f); - if (r < 0) - return r; - - r = journal_file_fsprg_evolve(f, realtime); - if (r < 0) - return r; - - return 0; -} - -int journal_file_hmac_put_object(JournalFile *f, ObjectType type, Object *o, uint64_t p) { - int r; - - assert(f); - - if (!f->seal) - return 0; - - r = journal_file_hmac_start(f); - if (r < 0) - return r; - - if (!o) { - r = journal_file_move_to_object(f, type, p, &o); - if (r < 0) - return r; - } else { - if (type > OBJECT_UNUSED && o->object.type != type) - return -EBADMSG; - } - - gcry_md_write(f->hmac, o, offsetof(ObjectHeader, payload)); - - switch (o->object.type) { - - case OBJECT_DATA: - /* All but hash and payload are mutable */ - gcry_md_write(f->hmac, &o->data.hash, sizeof(o->data.hash)); - gcry_md_write(f->hmac, o->data.payload, le64toh(o->object.size) - offsetof(DataObject, payload)); - break; - - case OBJECT_FIELD: - /* Same here */ - gcry_md_write(f->hmac, &o->field.hash, sizeof(o->field.hash)); - gcry_md_write(f->hmac, o->field.payload, le64toh(o->object.size) - offsetof(FieldObject, payload)); - break; - - case OBJECT_ENTRY: - /* All */ - gcry_md_write(f->hmac, &o->entry.seqnum, le64toh(o->object.size) - offsetof(EntryObject, seqnum)); - break; - - case OBJECT_FIELD_HASH_TABLE: - case OBJECT_DATA_HASH_TABLE: - case OBJECT_ENTRY_ARRAY: - /* Nothing: everything is mutable */ - break; - - case OBJECT_TAG: - /* All but the tag itself */ - gcry_md_write(f->hmac, &o->tag.seqnum, sizeof(o->tag.seqnum)); - gcry_md_write(f->hmac, &o->tag.epoch, sizeof(o->tag.epoch)); - break; - default: - return -EINVAL; - } - - return 0; -} - -int journal_file_hmac_put_header(JournalFile *f) { - int r; - - assert(f); - - if (!f->seal) - return 0; - - r = journal_file_hmac_start(f); - if (r < 0) - return r; - - /* All but state+reserved, boot_id, arena_size, - * tail_object_offset, n_objects, n_entries, - * tail_entry_seqnum, head_entry_seqnum, entry_array_offset, - * head_entry_realtime, tail_entry_realtime, - * tail_entry_monotonic, n_data, n_fields, n_tags, - * n_entry_arrays. */ - - gcry_md_write(f->hmac, f->header->signature, offsetof(Header, state) - offsetof(Header, signature)); - gcry_md_write(f->hmac, &f->header->file_id, offsetof(Header, boot_id) - offsetof(Header, file_id)); - gcry_md_write(f->hmac, &f->header->seqnum_id, offsetof(Header, arena_size) - offsetof(Header, seqnum_id)); - gcry_md_write(f->hmac, &f->header->data_hash_table_offset, offsetof(Header, tail_object_offset) - offsetof(Header, data_hash_table_offset)); - - return 0; -} - -int journal_file_fss_load(JournalFile *f) { - int r, fd = -1; - char *p = NULL; - struct stat st; - FSSHeader *m = NULL; - sd_id128_t machine; - - assert(f); - - if (!f->seal) - return 0; - - r = sd_id128_get_machine(&machine); - if (r < 0) - return r; - - if (asprintf(&p, "/var/log/journal/" SD_ID128_FORMAT_STR "/fss", - SD_ID128_FORMAT_VAL(machine)) < 0) - return -ENOMEM; - - fd = open(p, O_RDWR|O_CLOEXEC|O_NOCTTY, 0600); - if (fd < 0) { - if (errno != ENOENT) - log_error_errno(errno, "Failed to open %s: %m", p); - - r = -errno; - goto finish; - } - - if (fstat(fd, &st) < 0) { - r = -errno; - goto finish; - } - - if (st.st_size < (off_t) sizeof(FSSHeader)) { - r = -ENODATA; - goto finish; - } - - m = mmap(NULL, PAGE_ALIGN(sizeof(FSSHeader)), PROT_READ, MAP_SHARED, fd, 0); - if (m == MAP_FAILED) { - m = NULL; - r = -errno; - goto finish; - } - - if (memcmp(m->signature, FSS_HEADER_SIGNATURE, 8) != 0) { - r = -EBADMSG; - goto finish; - } - - if (m->incompatible_flags != 0) { - r = -EPROTONOSUPPORT; - goto finish; - } - - if (le64toh(m->header_size) < sizeof(FSSHeader)) { - r = -EBADMSG; - goto finish; - } - - if (le64toh(m->fsprg_state_size) != FSPRG_stateinbytes(le16toh(m->fsprg_secpar))) { - r = -EBADMSG; - goto finish; - } - - f->fss_file_size = le64toh(m->header_size) + le64toh(m->fsprg_state_size); - if ((uint64_t) st.st_size < f->fss_file_size) { - r = -ENODATA; - goto finish; - } - - if (!sd_id128_equal(machine, m->machine_id)) { - r = -EHOSTDOWN; - goto finish; - } - - if (le64toh(m->start_usec) <= 0 || - le64toh(m->interval_usec) <= 0) { - r = -EBADMSG; - goto finish; - } - - f->fss_file = mmap(NULL, PAGE_ALIGN(f->fss_file_size), PROT_READ|PROT_WRITE, MAP_SHARED, fd, 0); - if (f->fss_file == MAP_FAILED) { - f->fss_file = NULL; - r = -errno; - goto finish; - } - - f->fss_start_usec = le64toh(f->fss_file->start_usec); - f->fss_interval_usec = le64toh(f->fss_file->interval_usec); - - f->fsprg_state = (uint8_t*) f->fss_file + le64toh(f->fss_file->header_size); - f->fsprg_state_size = le64toh(f->fss_file->fsprg_state_size); - - r = 0; - -finish: - if (m) - munmap(m, PAGE_ALIGN(sizeof(FSSHeader))); - - safe_close(fd); - free(p); - - return r; -} - -int journal_file_hmac_setup(JournalFile *f) { - gcry_error_t e; - - if (!f->seal) - return 0; - - initialize_libgcrypt(true); - - e = gcry_md_open(&f->hmac, GCRY_MD_SHA256, GCRY_MD_FLAG_HMAC); - if (e != 0) - return -EOPNOTSUPP; - - return 0; -} - -int journal_file_append_first_tag(JournalFile *f) { - int r; - uint64_t p; - - if (!f->seal) - return 0; - - log_debug("Calculating first tag..."); - - r = journal_file_hmac_put_header(f); - if (r < 0) - return r; - - p = le64toh(f->header->field_hash_table_offset); - if (p < offsetof(Object, hash_table.items)) - return -EINVAL; - p -= offsetof(Object, hash_table.items); - - r = journal_file_hmac_put_object(f, OBJECT_FIELD_HASH_TABLE, NULL, p); - if (r < 0) - return r; - - p = le64toh(f->header->data_hash_table_offset); - if (p < offsetof(Object, hash_table.items)) - return -EINVAL; - p -= offsetof(Object, hash_table.items); - - r = journal_file_hmac_put_object(f, OBJECT_DATA_HASH_TABLE, NULL, p); - if (r < 0) - return r; - - r = journal_file_append_tag(f); - if (r < 0) - return r; - - return 0; -} - -int journal_file_parse_verification_key(JournalFile *f, const char *key) { - uint8_t *seed; - size_t seed_size, c; - const char *k; - int r; - unsigned long long start, interval; - - seed_size = FSPRG_RECOMMENDED_SEEDLEN; - seed = malloc(seed_size); - if (!seed) - return -ENOMEM; - - k = key; - for (c = 0; c < seed_size; c++) { - int x, y; - - while (*k == '-') - k++; - - x = unhexchar(*k); - if (x < 0) { - free(seed); - return -EINVAL; - } - k++; - y = unhexchar(*k); - if (y < 0) { - free(seed); - return -EINVAL; - } - k++; - - seed[c] = (uint8_t) (x * 16 + y); - } - - if (*k != '/') { - free(seed); - return -EINVAL; - } - k++; - - r = sscanf(k, "%llx-%llx", &start, &interval); - if (r != 2) { - free(seed); - return -EINVAL; - } - - f->fsprg_seed = seed; - f->fsprg_seed_size = seed_size; - - f->fss_start_usec = start * interval; - f->fss_interval_usec = interval; - - return 0; -} - -bool journal_file_next_evolve_usec(JournalFile *f, usec_t *u) { - uint64_t epoch; - - assert(f); - assert(u); - - if (!f->seal) - return false; - - epoch = FSPRG_GetEpoch(f->fsprg_state); - - *u = (usec_t) (f->fss_start_usec + f->fss_interval_usec * epoch + f->fss_interval_usec); - - return true; -} |