diff options
Diffstat (limited to 'ks_mmap.c')
| -rw-r--r-- | ks_mmap.c | 180 |
1 files changed, 0 insertions, 180 deletions
diff --git a/ks_mmap.c b/ks_mmap.c deleted file mode 100644 index 066e93e..0000000 --- a/ks_mmap.c +++ /dev/null @@ -1,180 +0,0 @@ -/* - * ks_mmap.c - * --------- - * Keystore implementation over POSIX mmap(). - * - * Authors: Rob Austein - * Copyright (c) 2015, NORDUnet A/S All rights reserved. - * - * Redistribution and use in source and binary forms, with or without - * modification, are permitted provided that the following conditions are - * met: - * - Redistributions of source code must retain the above copyright notice, - * this list of conditions and the following disclaimer. - * - * - Redistributions in binary form must reproduce the above copyright - * notice, this list of conditions and the following disclaimer in the - * documentation and/or other materials provided with the distribution. - * - * - Neither the name of the NORDUnet nor the names of its contributors may - * be used to endorse or promote products derived from this software - * without specific prior written permission. - * - * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS - * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED - * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A - * PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT - * HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, - * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED - * TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR - * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF - * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING - * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS - * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. - */ - -#include <unistd.h> -#include <fcntl.h> -#include <sys/mman.h> -#include <string.h> -#include <sys/errno.h> -#include <unistd.h> - -#include "hal.h" -#include "hal_internal.h" - -#ifndef HAL_KS_MMAP_FILE -#define HAL_KS_MMAP_FILE ".cryptech_hal_keystore" -#endif - -#ifndef MAP_FILE -#define MAP_FILE 0 -#endif - -/* - * Storing the KEK in with the keys it's protecting is a bad idea, but we have no better - * place to put it (real protection requires dedicated hardware, which we don't have here). - */ - -#define KEKBUF_LEN (bitsToBytes(256)) - -static hal_ks_keydb_t *db; -static uint8_t *kekbuf; - -const hal_ks_keydb_t *hal_ks_get_keydb(void) -{ - if (db != NULL) - return db; - - const char * const env = getenv("CRYPTECH_KEYSTORE"); - const char * const home = getenv("HOME"); - const char * const base = HAL_KS_MMAP_FILE; - const long pagemask = sysconf(_SC_PAGESIZE) - 1; - const size_t len = (sizeof(hal_ks_keydb_t) + KEKBUF_LEN + pagemask) & ~pagemask; - - char fn_[strlen(base) + (home == NULL ? 0 : strlen(home)) + 2]; - const char *fn = fn_; - int fd; - - if (pagemask < 0) - return NULL; - - if (env != NULL) - fn = env; - else if (home == NULL) - fn = base; - else - strcat(strcat(strcpy(fn_, home), "/"), base); - - if ((fd = open(fn, O_RDWR | O_CREAT | O_EXCL, 0600)) >= 0) { - uint8_t zeros[len]; - memset(zeros, 0, sizeof(zeros)); - (void) write(fd, zeros, sizeof(zeros)); - } - else if (errno == EEXIST) { - fd = open(fn, O_RDWR | O_CREAT, 0600); - } - - if (fd >= 0 && (db = mmap(NULL, len, PROT_READ | PROT_WRITE, MAP_FILE | MAP_SHARED, fd, 0)) != NULL) - kekbuf = (uint8_t *) (db + 1); - - (void) close(fd); - - return db; -} - -hal_error_t hal_ks_set_keydb(const hal_ks_key_t * const key, - const int loc, - const int updating) -{ - if (key == NULL || loc < 0 || loc >= sizeof(db->keys)/sizeof(*db->keys) || (!key->in_use != !updating)) - return HAL_ERROR_BAD_ARGUMENTS; - - db->keys[loc] = *key; - db->keys[loc].in_use = 1; - return HAL_OK; -} - -hal_error_t hal_ks_del_keydb(const int loc) -{ - if (loc < 0 || loc >= sizeof(db->keys)/sizeof(*db->keys)) - return HAL_ERROR_BAD_ARGUMENTS; - - db->keys[loc].in_use = 0; - memset(&db->keys[loc], 0, sizeof(db->keys[loc])); - return HAL_OK; -} - -hal_error_t hal_set_pin(const hal_user_t user, - const hal_ks_pin_t * const pin) -{ - if (pin == NULL) - return HAL_ERROR_BAD_ARGUMENTS; - - hal_ks_pin_t *p = NULL; - - switch (user) { - case HAL_USER_WHEEL: p = &db->wheel_pin; break; - case HAL_USER_SO: p = &db->so_pin; break; - case HAL_USER_NORMAL: p = &db->user_pin; break; - default: return HAL_ERROR_BAD_ARGUMENTS; - } - - *p = *pin; - return HAL_OK; -} - -hal_error_t hal_mkm_get_kek(uint8_t *kek, - size_t *kek_len, - const size_t kek_max) -{ - if (kek == NULL || kek_len == NULL || kek_max < bitsToBytes(128)) - return HAL_ERROR_BAD_ARGUMENTS; - - if (kekbuf == NULL) - return HAL_ERROR_IMPOSSIBLE; - - hal_error_t err; - - const size_t len = ((kek_max < bitsToBytes(192)) ? bitsToBytes(128) : - (kek_max < bitsToBytes(256)) ? bitsToBytes(192) : - bitsToBytes(256)); - - uint8_t t = 0; - - for (int i = 0; i < KEKBUF_LEN; i++) - t |= kekbuf[i]; - - if (t == 0 && (err = hal_rpc_get_random(kekbuf, sizeof(KEKBUF_LEN))) != HAL_OK) - return err; - - memcpy(kek, kekbuf, len); - *kek_len = len; - return HAL_OK; -} - -/* - * Local variables: - * indent-tabs-mode: nil - * End: - */ |