/* * 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 #include #include #include #include #include #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_ks_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_ks_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: */ pshot PKCS #8 Python hacks.' href='/sw/libhal/commit/pkcs8.py?h=auto_magic&id=6e3faad9418e66b2d02e8857c3449ce3e5f93e78'>6e3faad 
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