aboutsummaryrefslogtreecommitdiff
path: root/rpc_api.c
AgeCommit message (Expand)Author
2017-04-07Pull key type information from uploaded key in hal_rpc_pkey_load().Rob Austein
2017-04-06Shake bugs out of hal_rpc_pkey_export().Rob Austein
2017-04-05First cut at key backup code. Not tested yet.Rob Austein
2016-11-21Whack attribute code with a club until it works with PKCS #11.Rob Austein
2016-11-14More API cleanup: remove hal_rpc_pkey_list().Rob Austein
2016-11-14hal_rpc_pkey_find() -> hal_rpc_pkey_open().Rob Austein
2016-11-10Clean out huge swacks of RPC API we don't need anymore.Rob Austein
2016-11-08First cut at multi-attribute get/set/delete API.Rob Austein
2016-11-01Add hal_rpc_pkey_get_key_curve().Rob Austein
2016-10-24Make previous_uuid an input-only argument to hal_rpc_pkey_match().Rob Austein
2016-10-09Per-session objects in ks_volatile; more untested ks_attribute code.Rob Austein
2016-10-07Fix session handle arguments in RPC calls.Rob Austein
2016-10-07Checkpoint along the way to adding keystore attribute support.Rob Austein
2016-09-09Simplify hal_rpc_pkey_find() by removing `type` argument.Rob Austein
2016-09-01Revised keystore API, part one. Not usable yet.Rob Austein
2016-05-25Start cleaning up PIN code.Rob Austein
2016-05-15Add hal_rpc_pkey_rename(); allow null string as (temporary) key name.Rob Austein
2016-05-14Fix key flag check, untabify.Rob Austein
2016-05-14Add mixed-mode key support, for PKCS #11 "session" (ie, not "token") keys.Rob Austein
2016-05-12Add hal_digest_algorithm_none; tweak handling of none handles.Rob Austein
2016-03-16Added serial RPC transport and lots more...Paul Selkirk
2016-02-25RPC over loopback socket, just to work out the mechanics for serialization an...Paul Selkirk
2015-12-24hal_rpc_logout_all(), hal_rpc_is_logged_in().Rob Austein
2015-12-24More work on PIN/login/logout code. Access control still missing,Rob Austein
2015-12-23RPC interface to TRNG and (incomplete) PIN code.Rob Austein
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-10 09:55:12 +0000
207'>207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 
/*
 * rpc_hash.c
 * ----------
 * Remote procedure call server-side hash implementation.
 *
 * Authors: Rob Austein
 * Copyright (c) 2015-2016, 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 <string.h>

#include "hal.h"
#include "hal_internal.h"

/*
 * Need table and handle allocation, including some kind of in_use
 * flag (perhaps just handle == none).
 *
 * Hash and HMAC aren't really things for which we need permission
 * bits, so not sure we even care about login stuff here.
 */

typedef struct {
  hal_client_handle_t client_handle;
  hal_session_handle_t session_handle;
  hal_hash_handle_t hash_handle;
  union {
    hal_hash_state_t *hash;
    hal_hmac_state_t *hmac;
  } state;
} handle_slot_t;

#ifndef	HAL_STATIC_HASH_STATE_BLOCKS
#define	HAL_STATIC_HASH_STATE_BLOCKS 0
#endif

#ifndef	HAL_STATIC_HMAC_STATE_BLOCKS
#define	HAL_STATIC_HMAC_STATE_BLOCKS 0
#endif

#if HAL_STATIC_HASH_STATE_BLOCKS > 0
static handle_slot_t hash_handle[HAL_STATIC_HASH_STATE_BLOCKS];
#endif

#if HAL_STATIC_HMAC_STATE_BLOCKS > 0
static handle_slot_t hmac_handle[HAL_STATIC_HMAC_STATE_BLOCKS];
#endif

/*
 * Handle allocation is simple: we look for an unused (state == NULL)
 * slot in the appropriate table, and, assuming we find one, construct
 * a composite handle consisting of a flag telling us which table this
 * is, the index into the table, and a counter whose sole purpose is
 * to keep the same handle from reoccurring anytime soon, to help
 * identify use-after-free bugs in calling code.
 */

#define	HANDLE_FLAG_HMAC	0x80000000

static inline handle_slot_t *alloc_handle(const int is_hmac)
{
#if HAL_STATIC_HASH_STATE_BLOCKS > 0 || HAL_STATIC_HMAC_STATE_BLOCKS > 0
  static uint16_t next_glop = 0;
  uint32_t glop = ++next_glop << 16;
  next_glop %= 0x7FFF;
#endif

#if HAL_STATIC_HASH_STATE_BLOCKS > 0
  if (!is_hmac) {
    for (int i = 0; i < sizeof(hash_handle)/sizeof(*hash_handle); i++) {
      if (hash_handle[i].state.hash != NULL)
        continue;
      hash_handle[i].hash_handle.handle = i | glop;
      return &hash_handle[i];
    }
  }
#endif

#if HAL_STATIC_HMAC_STATE_BLOCKS > 0
  if (is_hmac) {
    for (int i = 0; i < sizeof(hmac_handle)/sizeof(*hmac_handle); i++) {
      if (hmac_handle[i].state.hmac != NULL)
        continue;
      hmac_handle[i].hash_handle.handle = i | glop | HANDLE_FLAG_HMAC;
      return &hmac_handle[i];
    }
  }
#endif

  return NULL;
}

/*
 * Check a caller-supplied handle.  Must be in range, in use, and have
 * the right glop.  Returns slot pointer on success, NULL otherwise.
 */

static inline handle_slot_t *find_handle(const hal_hash_handle_t handle)
{
#if HAL_STATIC_HASH_STATE_BLOCKS > 0 || HAL_STATIC_HMAC_STATE_BLOCKS > 0
  const int i = (int) (handle.handle & 0xFFFF);
  const int is_hmac = (handle.handle & HANDLE_FLAG_HMAC) != 0;
#endif

#if HAL_STATIC_HASH_STATE_BLOCKS > 0
  if (!is_hmac && i < sizeof(hash_handle)/sizeof(*hash_handle) &&
      hash_handle[i].hash_handle.handle == handle.handle && hash_handle[i].state.hash != NULL)
    return &hash_handle[i];
#endif

#if HAL_STATIC_HMAC_STATE_BLOCKS > 0
  if (is_hmac && i < sizeof(hmac_handle)/sizeof(*hmac_handle) &&
      hmac_handle[i].hash_handle.handle == handle.handle && hmac_handle[i].state.hmac != NULL)
    return &hmac_handle[i];
#endif

  return NULL;
}

static inline void free_handle(handle_slot_t *slot)
{
  if (slot != NULL)
    /* state is a union, so this this works for hash and hmac */
    slot->state.hash = NULL;
}

/*
 * Translate an algorithm number to a descriptor.
 */

static inline const hal_hash_descriptor_t *alg_to_descriptor(const hal_digest_algorithm_t alg)
{
  switch (alg) {
  case HAL_DIGEST_ALGORITHM_SHA1:       return hal_hash_sha1;
  case HAL_DIGEST_ALGORITHM_SHA256:     return hal_hash_sha256;
  case HAL_DIGEST_ALGORITHM_SHA512_224: return hal_hash_sha512_224;
  case HAL_DIGEST_ALGORITHM_SHA512_256: return hal_hash_sha512_256;
  case HAL_DIGEST_ALGORITHM_SHA384:     return hal_hash_sha384;
  case HAL_DIGEST_ALGORITHM_SHA512:     return hal_hash_sha512;
  default:                              return NULL;
  }
}

/*
 * Given a slot pointer, fetch the descriptor.
 */

static inline const hal_hash_descriptor_t *slot_to_descriptor(const handle_slot_t * const slot)
{
  if (slot == NULL)
    return NULL;

  if ((slot->hash_handle.handle & HANDLE_FLAG_HMAC) == 0)
    return hal_hash_get_descriptor(slot->state.hash);
  else
    return hal_hmac_get_descriptor(slot->state.hmac);
}

/*
 * Public API
 */

static hal_error_t get_digest_length(const hal_digest_algorithm_t alg, size_t *length)
{
  const hal_hash_descriptor_t * const d = alg_to_descriptor(alg);

  if (d == NULL || length == NULL)
    return HAL_ERROR_BAD_ARGUMENTS;

  *length = d->digest_length;
  return HAL_OK;
}

static hal_error_t get_digest_algorithm_id(const hal_digest_algorithm_t alg,
                                           uint8_t *id, size_t *len, const size_t len_max)
{
  const hal_hash_descriptor_t * const d = alg_to_descriptor(alg);

  if (d == NULL)
    return HAL_ERROR_BAD_ARGUMENTS;

  if (len != NULL)
    *len = d->digest_algorithm_id_length;

  if (id == NULL)
    return HAL_OK;

  if (len_max < d->digest_algorithm_id_length)
    return HAL_ERROR_RESULT_TOO_LONG;

  memcpy(id, d->digest_algorithm_id, d->digest_algorithm_id_length);
  return HAL_OK;
}

static hal_error_t get_algorithm(const hal_hash_handle_t handle, hal_digest_algorithm_t *alg)
{
  handle_slot_t *slot = find_handle(handle);
  const hal_hash_descriptor_t *descriptor = slot_to_descriptor(slot);

  if (slot == NULL || alg == NULL)
    return HAL_ERROR_BAD_ARGUMENTS;

  if (descriptor == NULL)
    return HAL_ERROR_IMPOSSIBLE;

  *alg = descriptor->digest_algorithm;
  return HAL_OK;
}

static hal_error_t initialize(const hal_client_handle_t client,
                              const hal_session_handle_t session,
                              hal_hash_handle_t *hash,
                              const hal_digest_algorithm_t alg,
                              const uint8_t * const key, const size_t key_len)
{
  const hal_hash_descriptor_t *descriptor;
  handle_slot_t *slot;
  hal_error_t err;

  if (hash == NULL)
    return HAL_ERROR_BAD_ARGUMENTS;

  if ((descriptor = alg_to_descriptor(alg)) == NULL)
    return HAL_ERROR_BAD_ARGUMENTS;

  if ((slot = alloc_handle(key_len != 0)) == NULL)
    return HAL_ERROR_ALLOCATION_FAILURE;

  slot->client_handle  = client;
  slot->session_handle = session;
  *hash = slot->hash_handle;

  if (key_len == 0)
    err = hal_hash_initialize(NULL, descriptor, &slot->state.hash, NULL, 0);
  else
    err = hal_hmac_initialize(NULL, descriptor, &slot->state.hmac, NULL, 0, key, key_len);
  if (err != HAL_OK)
    free_handle(slot);
  return err;
}

static hal_error_t update(const hal_hash_handle_t handle,
                          const uint8_t * data, const size_t length)
{
  handle_slot_t *slot = find_handle(handle);

  if (slot == NULL)
    return HAL_ERROR_BAD_ARGUMENTS;

  if ((handle.handle & HANDLE_FLAG_HMAC) == 0)
    return hal_hash_update(slot->state.hash, data, length);
  else
    return hal_hmac_update(slot->state.hmac, data, length);
}

static hal_error_t finalize(const hal_hash_handle_t handle,
                            uint8_t *digest, const size_t length)
{
  handle_slot_t *slot = find_handle(handle);
  hal_error_t err;

  if (slot == NULL)
    return HAL_ERROR_BAD_ARGUMENTS;

  if ((handle.handle & HANDLE_FLAG_HMAC) == 0) {
    err = hal_hash_finalize(slot->state.hash, digest, length);
    hal_hash_cleanup(&slot->state.hash);
  }

  else {
    err = hal_hmac_finalize(slot->state.hmac, digest, length);
    hal_hmac_cleanup(&slot->state.hmac);
  }

  free_handle(slot);
  return err;
}

const hal_rpc_hash_dispatch_t hal_rpc_local_hash_dispatch = {
  .get_digest_length            = get_digest_length,
  .get_digest_algorithm_id      = get_digest_algorithm_id,
  .get_algorithm                = get_algorithm,
  .initialize                   = initialize,
  .update                       = update,
  .finalize                     = finalize
};

/*
 * Local variables:
 * indent-tabs-mode: nil
 * End:
 */