path: root/rpc_server.c

/*
 * rpc_server.c
 * ------------
 * Remote procedure call server-side private API implementation.
 *
 * Copyright (c) 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 "hal.h"
#include "hal_internal.h"
#include "xdr_internal.h"

/*
 * RPC calls.
 */

#define check(op) do { hal_error_t _err = (op); if (_err != HAL_OK) return _err; } while (0)

#define pad(n) (((n) + 3) & ~3)

static hal_error_t get_version(const uint8_t **iptr, const uint8_t * const ilimit,
                               uint8_t **optr, const uint8_t * const olimit)
{
    hal_client_handle_t client __attribute__((unused));
    uint32_t version;
    hal_error_t ret;

    check(hal_xdr_decode_int(iptr, ilimit, &client.handle));

    /* call the local function */
    ret = hal_rpc_get_version(&version);

    if (ret == HAL_OK)
        check(hal_xdr_encode_int(optr, olimit, version));

    return ret;
}

static hal_error_t get_random(const uint8_t **iptr, const uint8_t * const ilimit,
                              uint8_t **optr, const uint8_t * const olimit)
{
    hal_client_handle_t client __attribute__((unused));
    uint32_t length;
    hal_error_t ret;

    check(hal_xdr_decode_int(iptr, ilimit, &client.handle));
    check(hal_xdr_decode_int(iptr, ilimit, &length));
    /* sanity check length */
    if (length == 0 || length > olimit - *optr - 4)
        return HAL_ERROR_RPC_PACKET_OVERFLOW;

    /* call the local function */
    /* get the data directly into the output buffer */
    check(hal_xdr_encode_int(optr, olimit, length));
    ret = hal_rpc_get_random(*optr, (size_t)length);
    if (ret == HAL_OK)
        *optr += pad(length);
    else
        /* don't return data if error */
        *optr -= 4;

    return ret;
}

static hal_error_t set_pin(const uint8_t **iptr, const uint8_t * const ilimit,
                           uint8_t **optr, const uint8_t * const olimit)
{
    hal_client_handle_t client;
    uint32_t user;
    const uint8_t *pin;
    uint32_t pin_len;
    hal_error_t ret;

    check(hal_xdr_decode_int(iptr, ilimit, &client.handle));
    check(hal_xdr_decode_int(iptr, ilimit, &user));
    check(hal_xdr_decode_buffer_in_place(iptr, ilimit, &pin, &pin_len));

    /* call the local function */
    ret = hal_rpc_set_pin(client, user, (const char * const)pin, pin_len);

    return ret;
}

static hal_error_t login(const uint8_t **iptr, const uint8_t * const ilimit,
                         uint8_t **optr, const uint8_t * const olimit)
{
    hal_client_handle_t client;
    uint32_t user;
    const uint8_t *pin;
    uint32_t pin_len;
    hal_error_t ret;

    check(hal_xdr_decode_int(iptr, ilimit, &client.handle));
    check(hal_xdr_decode_int(iptr, ilimit, &user));
    check(hal_xdr_decode_buffer_in_place(iptr, ilimit, &pin, &pin_len));

    /* call the local function */
    ret = hal_rpc_login(client, user, (const char * const)pin, pin_len);

    return ret;
}

static hal_error_t logout(const uint8_t **iptr, const uint8_t * const ilimit,
                          uint8_t **optr, const uint8_t * const olimit)
{
    hal_client_handle_t client;
    hal_error_t ret;

    check(hal_xdr_decode_int(iptr, ilimit, &client.handle));

    /* call the local function */
    ret = hal_rpc_logout(client);

    return ret;
}

static hal_error_t logout_all(const uint8_t **iptr, const uint8_t * const ilimit,
                              uint8_t **optr, const uint8_t * const olimit)
{
    hal_client_handle_t client __attribute__((unused));
    hal_error_t ret;

    check(hal_xdr_decode_int(iptr, ilimit, &client.handle));

    /* call the local function */
    ret = hal_rpc_logout_all();

    return ret;
}

static hal_error_t is_logged_in(const uint8_t **iptr, const uint8_t * const ilimit,
                                uint8_t **optr, const uint8_t * const olimit)
{
    hal_client_handle_t client;
    uint32_t user;
    hal_error_t ret;

    check(hal_xdr_decode_int(iptr, ilimit, &client.handle));
    check(hal_xdr_decode_int(iptr, ilimit, &user));

    /* call the local function */
    ret = hal_rpc_is_logged_in(client, user);

    return ret;
}

static hal_error_t hash_get_digest_len(const uint8_t **iptr, const uint8_t * const ilimit,
                                       uint8_t **optr, const uint8_t * const olimit)
{
    hal_client_handle_t client __attribute__((unused));
    uint32_t alg;
    size_t length;
    hal_error_t ret;

    check(hal_xdr_decode_int(iptr, ilimit, &client.handle));
    check(hal_xdr_decode_int(iptr, ilimit, &alg));

    /* call the local function */
    ret = hal_rpc_hash_get_digest_length(alg, &length);

    if (ret == HAL_OK)
        check(hal_xdr_encode_int(optr, olimit, length));

    return ret;
}

static hal_error_t hash_get_digest_algorithm_id(const uint8_t **iptr, const uint8_t * const ilimit,
                                                uint8_t **optr, const uint8_t * const olimit)
{
    hal_client_handle_t client __attribute__((unused));
    uint32_t alg;
    size_t len;
    uint32_t len_max;
    uint8_t *optr_orig = *optr;
    hal_error_t ret;

    check(hal_xdr_decode_int(iptr, ilimit, &client.handle));
    check(hal_xdr_decode_int(iptr, ilimit, &alg));
    check(hal_xdr_decode_int(iptr, ilimit, &len_max));
    /* sanity check len_max */
    if (len_max > olimit - *optr - 4)
        return HAL_ERROR_RPC_PACKET_OVERFLOW;

    /* call the local function */
    /* get the data directly into the output buffer */
    *optr += 4;         /* reserve 4 bytes for length */
    ret = hal_rpc_hash_get_digest_algorithm_id(alg, *optr, &len, (size_t)len_max);
    if (ret == HAL_OK) {
        *optr = optr_orig;
        check(hal_xdr_encode_int(optr, olimit, len));
        *optr += pad(len);
    }
    else {
        /* don't return data if error */
        *optr = optr_orig;
    }
    return ret;
}

static hal_error_t hash_get_algorithm(const uint8_t **iptr, const uint8_t * const ilimit,
                                      uint8_t **optr, const uint8_t * const olimit)
{
    hal_client_handle_t client __attribute__((unused));
    hal_hash_handle_t hash;
    hal_digest_algorithm_t alg;
    hal_error_t ret;

    check(hal_xdr_decode_int(iptr, ilimit, &client.handle));
    check(hal_xdr_decode_int(iptr, ilimit, &hash.handle));

    /* call the local function */
    ret = hal_rpc_hash_get_algorithm(hash, &alg);

    if (ret == HAL_OK)
        check(hal_xdr_encode_int(optr, olimit, alg));

    return ret;
}

static hal_error_t hash_initialize(const uint8_t **iptr, const uint8_t * const ilimit,
                                   uint8_t **optr, const uint8_t * const olimit)
{
    hal_client_handle_t client;
    hal_session_handle_t session;
    hal_hash_handle_t hash;
    uint32_t alg;
    const uint8_t *key;
    uint32_t key_len;
    hal_error_t ret;

    check(hal_xdr_decode_int(iptr, ilimit, &client.handle));
    check(hal_xdr_decode_int(iptr, ilimit, &session.handle));
    check(hal_xdr_decode_int(iptr, ilimit, &alg));
    check(hal_xdr_decode_buffer_in_place(iptr, ilimit, &key, &key_len));

    /* call the local function */
    ret = hal_rpc_hash_initialize(client, session, &hash, (hal_digest_algorithm_t)alg, key, (size_t)key_len);

    if (ret == HAL_OK)
        check(hal_xdr_encode_int(optr, olimit, hash.handle));

    return ret;
}

static hal_error_t hash_update(const uint8_t **iptr, const uint8_t * const ilimit,
                               uint8_t **optr, const uint8_t * const olimit)
{
    hal_client_handle_t client __attribute__((unused));
    hal_hash_handle_t hash;
    const uint8_t *data;
    uint32_t length;
    hal_error_t ret;

    check(hal_xdr_decode_int(iptr, ilimit, &client.handle));
    check(hal_xdr_decode_int(iptr, ilimit, &hash.handle));
    check(hal_xdr_decode_buffer_in_place(iptr, ilimit, &data, &length));

    /* call the local function */
    ret = hal_rpc_hash_update(hash, data, (size_t)length);

    return ret;
}

static hal_error_t hash_finalize(const uint8_t **iptr, const uint8_t * const ilimit,
                                 uint8_t **optr, const uint8_t * const olimit)
{
    hal_client_handle_t client __attribute__((unused));
    hal_hash_handle_t hash;
    uint32_t length;
    hal_error_t ret;

    check(hal_xdr_decode_int(iptr, ilimit, &client.handle));
    check(hal_xdr_decode_int(iptr, ilimit, &hash.handle));
    check(hal_xdr_decode_int(iptr, ilimit, &length));
    /* sanity check length */
    if (length == 0 || length > olimit - *optr - 4)
        return HAL_ERROR_RPC_PACKET_OVERFLOW;

    /* call the local function */
    /* get the data directly into the output buffer */
    check(hal_xdr_encode_int(optr, olimit, length));
    ret = hal_rpc_hash_finalize(hash, *optr, (size_t)length);
    if (ret == HAL_OK)
        *optr += pad(length);
    else
        /* don't return data if error */
        *optr -= 4;
    return ret;
}

static hal_error_t pkey_load(const uint8_t **iptr, const uint8_t * const ilimit,
                             uint8_t **optr, const uint8_t * const olimit)
{
    hal_client_handle_t client;
    hal_session_handle_t session;
    hal_pkey_handle_t pkey;
    uint32_t type;
    uint32_t curve;
    hal_uuid_t name;
    const uint8_t *der;
    uint32_t der_len;
    hal_key_flags_t flags;
    hal_error_t ret;

    check(hal_xdr_decode_int(iptr, ilimit, &client.handle));
    check(hal_xdr_decode_int(iptr, ilimit, &session.handle));
    check(hal_xdr_decode_int(iptr, ilimit, &type));
    check(hal_xdr_decode_int(iptr, ilimit, &curve));
    check(hal_xdr_decode_buffer_in_place(iptr, ilimit, &der, &der_len));
    check(hal_xdr_decode_int(iptr, ilimit, &flags));

    /* call the local function */
    ret = hal_rpc_pkey_load(client, session, &pkey, type, curve, &name, der, der_len, flags);

    if (ret == HAL_OK) {
        uint8_t *optr_orig = *optr;
        if ((ret = hal_xdr_encode_int(optr, olimit, pkey.handle)) != HAL_OK ||
            (ret = hal_xdr_encode_buffer(optr, olimit, name.uuid, sizeof(name.uuid))) != HAL_OK)
            *optr = optr_orig;
    }

    return ret;
}

static hal_error_t pkey_find(const uint8_t **iptr, const uint8_t * const ilimit,
                             uint8_t **optr, const uint8_t * const olimit)
{
    hal_client_handle_t client;
    hal_session_handle_t session;
    hal_pkey_handle_t pkey;
    const uint8_t *name_ptr;
    uint32_t name_len;
    hal_key_flags_t flags;
    hal_error_t ret;

    check(hal_xdr_decode_int(iptr, ilimit, &client.handle));
    check(hal_xdr_decode_int(iptr, ilimit, &session.handle));
    check(hal_xdr_decode_buffer_in_place(iptr, ilimit, &name_ptr, &name_len));
    check(hal_xdr_decode_int(iptr, ilimit, &flags));

    if (name_len != sizeof(hal_uuid_t))
        return HAL_ERROR_KEY_NAME_TOO_LONG;

    /* call the local function */
    ret = hal_rpc_pkey_find(client, session, &pkey, (const hal_uuid_t *) name_ptr, flags);

    if (ret == HAL_OK)
        check(hal_xdr_encode_int(optr, olimit, pkey.handle));

    return ret;
}

static hal_error_t pkey_generate_rsa(const uint8_t **iptr, const uint8_t * const ilimit,
                                     uint8_t **optr, const uint8_t * const olimit)
{
    hal_client_handle_t client;
    hal_session_handle_t session;
    hal_pkey_handle_t pkey;
    hal_uuid_t name;
    uint32_t key_len;
    const uint8_t *exp;
    uint32_t exp_len;
    hal_key_flags_t flags;
    hal_error_t ret;

    check(hal_xdr_decode_int(iptr, ilimit, &client.handle));
    check(hal_xdr_decode_int(iptr, ilimit, &session.handle));
    check(hal_xdr_decode_int(iptr, ilimit, &key_len));
    check(hal_xdr_decode_buffer_in_place(iptr, ilimit, &exp, &exp_len));
    check(hal_xdr_decode_int(iptr, ilimit, &flags));

    /* call the local function */
    ret = hal_rpc_pkey_generate_rsa(client, session, &pkey, &name, key_len, exp, exp_len, flags);

    if (ret == HAL_OK) {
        uint8_t *optr_orig = *optr;
        if ((ret = hal_xdr_encode_int(optr, olimit, pkey.handle)) != HAL_OK ||
            (ret = hal_xdr_encode_buffer(optr, olimit, name.uuid, sizeof(name.uuid))) != HAL_OK)
            *optr = optr_orig;
    }

    return ret;
}

static hal_error_t pkey_generate_ec(const uint8_t **iptr, const uint8_t * const ilimit,
                                    uint8_t **optr, const uint8_t * const olimit)
{
    hal_client_handle_t client;
    hal_session_handle_t session;
    hal_pkey_handle_t pkey;
    hal_uuid_t name;
    uint32_t curve;
    hal_key_flags_t flags;
    hal_error_t ret;

    check(hal_xdr_decode_int(iptr, ilimit, &client.handle));
    check(hal_xdr_decode_int(iptr, ilimit, &session.handle));
    check(hal_xdr_decode_int(iptr, ilimit, &curve));
    check(hal_xdr_decode_int(iptr, ilimit, &flags));

    /* call the local function */
    ret = hal_rpc_pkey_generate_ec(client, session, &pkey, &name, curve, flags);

    if (ret == HAL_OK) {
        uint8_t *optr_orig = *optr;
        if ((ret = hal_xdr_encode_int(optr, olimit, pkey.handle)) != HAL_OK ||
            (ret = hal_xdr_encode_buffer(optr, olimit, name.uuid, sizeof(name.uuid))) != HAL_OK)
            *optr = optr_orig;
    }

    return ret;
}

static hal_error_t pkey_close(const uint8_t **iptr, const uint8_t * const ilimit,
                              uint8_t **optr, const uint8_t * const olimit)
{
    hal_client_handle_t client __attribute__((unused));
    hal_pkey_handle_t pkey;
    hal_error_t ret;

    check(hal_xdr_decode_int(iptr, ilimit, &client.handle));
    check(hal_xdr_decode_int(iptr, ilimit, &pkey.handle));

    /* call the local function */
    ret = hal_rpc_pkey_close(pkey);

    return ret;
}

static hal_error_t pkey_delete(const uint8_t **iptr, const uint8_t * const ilimit,
                               uint8_t **optr, const uint8_t * const olimit)
{
    hal_client_handle_t client __attribute__((unused));
    hal_pkey_handle_t pkey;
    hal_error_t ret;

    check(hal_xdr_decode_int(iptr, ilimit, &client.handle));
    check(hal_xdr_decode_int(iptr, ilimit, &pkey.handle));

    /* call the local function */
    ret = hal_rpc_pkey_delete(pkey);

    return ret;
}

static hal_error_t pkey_get_key_type(const uint8_t **iptr, const uint8_t * const ilimit,
                                     uint8_t **optr, const uint8_t * const olimit)
{
    hal_client_handle_t client __attribute__((unused));
    hal_pkey_handle_t pkey;
    hal_key_type_t type;
    hal_error_t ret;

    check(hal_xdr_decode_int(iptr, ilimit, &client.handle));
    check(hal_xdr_decode_int(iptr, ilimit, &pkey.handle));

    /* call the local function */
    ret = hal_rpc_pkey_get_key_type(pkey, &type);

    if (ret == HAL_OK)
        check(hal_xdr_encode_int(optr, olimit, type));

    return ret;
}

static hal_error_t pkey_get_key_curve(const uint8_t **iptr, const uint8_t * const ilimit,
                                     uint8_t **optr, const uint8_t * const olimit)
{
    hal_client_handle_t client;
    hal_pkey_handle_t pkey;
    hal_curve_name_t curve;
    hal_error_t ret;

    check(hal_xdr_decode_int(iptr, ilimit, &client.handle));
    check(hal_xdr_decode_int(iptr, ilimit, &pkey.handle));

    /* call the local function */
    ret = hal_rpc_pkey_get_key_curve(pkey, &curve);

    if (ret == HAL_OK)
        check(hal_xdr_encode_int(optr, olimit, curve));

    return ret;
}

static hal_error_t pkey_get_key_flags(const uint8_t **iptr, const uint8_t * const ilimit,
                                      uint8_t **optr, const uint8_t * const olimit)
{
    hal_client_handle_t client __attribute__((unused));
    hal_pkey_handle_t pkey;
    hal_key_flags_t flags;
    hal_error_t ret;

    check(hal_xdr_decode_int(iptr, ilimit, &client.handle));
    check(hal_xdr_decode_int(iptr, ilimit, &pkey.handle));

    /* call the local function */
    ret = hal_rpc_pkey_get_key_flags(pkey, &flags);

    if (ret == HAL_OK)
        check(hal_xdr_encode_int(optr, olimit, flags));

    return ret;
}

static hal_error_t pkey_get_public_key_len(const uint8_t **iptr, const uint8_t * const ilimit,
                                           uint8_t **optr, const uint8_t * const olimit)
{
    hal_client_handle_t client __attribute__((unused));
    hal_pkey_handle_t pkey;
    size_t len;

    check(hal_xdr_decode_int(iptr, ilimit, &client.handle));
    check(hal_xdr_decode_int(iptr, ilimit, &pkey.handle));

    /* call the local function */
    len = hal_rpc_pkey_get_public_key_len(pkey);

    check(hal_xdr_encode_int(optr, olimit, len));

    return HAL_OK;
}

static hal_error_t pkey_get_public_key(const uint8_t **iptr, const uint8_t * const ilimit,
                                       uint8_t **optr, const uint8_t * const olimit)
{
    hal_client_handle_t client __attribute__((unused));
    hal_pkey_handle_t pkey;
    size_t len;
    uint32_t len_max;
    uint8_t *optr_orig = *optr;
    hal_error_t ret;

    check(hal_xdr_decode_int(iptr, ilimit, &client.handle));
    check(hal_xdr_decode_int(iptr, ilimit, &pkey.handle));
    check(hal_xdr_decode_int(iptr, ilimit, &len_max));
    /* sanity check len_max */
    if (len_max > olimit - *optr - 4)
        return HAL_ERROR_RPC_PACKET_OVERFLOW;

    /* call the local function */
    /* get the data directly into the output buffer */
    *optr += 4;         /* reserve 4 bytes for length */
    ret = hal_rpc_pkey_get_public_key(pkey, *optr, &len, len_max);
    if (ret == HAL_OK) {
        *optr = optr_orig;
        check(hal_xdr_encode_int(optr, olimit, len));
        *optr += pad(len);
    }
    else {
        /* don't return data if error */
        *optr = optr_orig;
    }
    return ret;
}

static hal_error_t pkey_sign(const uint8_t **iptr, const uint8_t * const ilimit,
                             uint8_t **optr, const uint8_t * const olimit)
{
    hal_client_handle_t client;
    hal_pkey_handle_t pkey;
    hal_hash_handle_t hash;
    const uint8_t *input;
    uint32_t input_len;
    uint32_t sig_max;
    size_t sig_len;
    uint8_t *optr_orig = *optr;
    hal_error_t ret;

    check(hal_xdr_decode_int(iptr, ilimit, &client.handle));
    check(hal_xdr_decode_int(iptr, ilimit, &pkey.handle));
    check(hal_xdr_decode_int(iptr, ilimit, &hash.handle));
    check(hal_xdr_decode_buffer_in_place(iptr, ilimit, &input, &input_len));
    check(hal_xdr_decode_int(iptr, ilimit, &sig_max));
    /* sanity check sig_max */
    if (sig_max > olimit - *optr - 4)
        return HAL_ERROR_RPC_PACKET_OVERFLOW;

    /* call the local function */
    /* get the data directly into the output buffer */
    *optr += 4;         /* reserve 4 bytes for length */
    ret = hal_rpc_pkey_sign(pkey, hash, input, input_len, *optr, &sig_len, sig_max);
    *optr = optr_orig;
    if (ret == HAL_OK) {
        check(hal_xdr_encode_int(optr, olimit, sig_len));
        *optr += pad(sig_len);
    }
    return ret;
}

static hal_error_t pkey_verify(const uint8_t **iptr, const uint8_t * const ilimit,
                               uint8_t **optr, const uint8_t * const olimit)
{
    hal_client_handle_t client;
    hal_pkey_handle_t pkey;
    hal_hash_handle_t hash;
    const uint8_t *input;
    uint32_t input_len;
    const uint8_t *sig;
    uint32_t sig_len;
    hal_error_t ret;

    check(hal_xdr_decode_int(iptr, ilimit, &client.handle));
    check(hal_xdr_decode_int(iptr, ilimit, &pkey.handle));
    check(hal_xdr_decode_int(iptr, ilimit, &hash.handle));
    check(hal_xdr_decode_buffer_in_place(iptr, ilimit, &input, &input_len));
    check(hal_xdr_decode_buffer_in_place(iptr, ilimit, &sig, &sig_len));

    /* call the local function */
    ret = hal_rpc_pkey_verify(pkey, hash, input, input_len, sig, sig_len);

    return ret;
}

static hal_error_t hal_xdr_encode_pkey_info(uint8_t **optr, const uint8_t * const olimit, const hal_pkey_info_t *info)
{
    uint8_t *optr_orig = *optr;
    hal_error_t ret;

    if ((ret = hal_xdr_encode_int(optr, olimit, info->type)) != HAL_OK ||
        (ret = hal_xdr_encode_int(optr, olimit, info->curve)) != HAL_OK ||
        (ret = hal_xdr_encode_int(optr, olimit, info->flags)) != HAL_OK ||
        (ret = hal_xdr_encode_buffer(optr, olimit, info->name.uuid, sizeof(info->name.uuid))) != HAL_OK)
        *optr = optr_orig;
    return ret;
}

static hal_error_t pkey_list(const uint8_t **iptr, const uint8_t * const ilimit,
                             uint8_t **optr, const uint8_t * const olimit)
{
    hal_client_handle_t client;
    hal_session_handle_t session;
    uint8_t *optr_orig = *optr;
    uint32_t result_max;
    hal_key_flags_t flags;
    hal_error_t ret;

    check(hal_xdr_decode_int(iptr, ilimit, &client.handle));
    check(hal_xdr_decode_int(iptr, ilimit, &session.handle));
    check(hal_xdr_decode_int(iptr, ilimit, &result_max));
    check(hal_xdr_decode_int(iptr, ilimit, &flags));

    hal_pkey_info_t result[result_max];
    unsigned result_len;

    /* call the local function */
    ret = hal_rpc_pkey_list(client, session, result, &result_len, result_max, flags);

    if (ret == HAL_OK) {
        check(hal_xdr_encode_int(optr, olimit, result_len));
        for (int i = 0; i < result_len; ++i) {
            if ((ret = hal_xdr_encode_pkey_info(optr, olimit, &result[i])) != HAL_OK) {
                *optr = optr_orig;
                break;
            }
        }
    }

    return ret;
}

static hal_error_t pkey_match(const uint8_t **iptr, const uint8_t * const ilimit,
                              uint8_t **optr, const uint8_t * const olimit)
{
    hal_client_handle_t client;
    hal_session_handle_t session;
    uint32_t type, curve, attributes_len, result_max, previous_uuid_len;
    const uint8_t *previous_uuid_ptr;
    hal_key_flags_t flags;
    hal_error_t ret;

    check(hal_xdr_decode_int(iptr, ilimit, &client.handle));
    check(hal_xdr_decode_int(iptr, ilimit, &session.handle));
    check(hal_xdr_decode_int(iptr, ilimit, &type));
    check(hal_xdr_decode_int(iptr, ilimit, &curve));
    check(hal_xdr_decode_int(iptr, ilimit, &flags));
    check(hal_xdr_decode_int(iptr, ilimit, &attributes_len));

    hal_rpc_pkey_attribute_t attributes[attributes_len > 0 ? attributes_len : 1];

    for (int i = 0; i < attributes_len; i++) {
        hal_rpc_pkey_attribute_t *a = &attributes[i];
        uint32_t value_len;
        check(hal_xdr_decode_int(iptr, ilimit, &a->type));
        check(hal_xdr_decode_buffer_in_place(iptr, ilimit, &a->value, &value_len));
        a->length = value_len;
    }

    check(hal_xdr_decode_int(iptr, ilimit, &result_max));
    check(hal_xdr_decode_buffer_in_place(iptr, ilimit, &previous_uuid_ptr, &previous_uuid_len));

    if (previous_uuid_len != sizeof(hal_uuid_t))
        return HAL_ERROR_KEY_NAME_TOO_LONG;

    const hal_uuid_t * const previous_uuid = (const void *) previous_uuid_ptr;

    hal_uuid_t result[result_max];
    unsigned result_len;

    ret = hal_rpc_pkey_match(client, session, type, curve, flags,
                             attributes, attributes_len,
                             result, &result_len, result_max,
                             previous_uuid);

    if (ret == HAL_OK) {
        uint8_t *optr_orig = *optr;
        ret = hal_xdr_encode_int(optr, olimit, result_len);
        for (int i = 0; ret == HAL_OK && i < result_len; ++i)
            ret = hal_xdr_encode_buffer(optr, olimit, result[i].uuid,
                                        sizeof(result[i].uuid));
        if (ret != HAL_OK)
            *optr = optr_orig;
    }

    return ret;
}

static hal_error_t pkey_set_attribute(const uint8_t **iptr, const uint8_t * const ilimit,
                                      uint8_t **optr, const uint8_t * const olimit)
{
    hal_client_handle_t client;
    hal_pkey_handle_t pkey;
    uint32_t type;
    const uint8_t *value;
    uint32_t value_len;
    hal_error_t ret;

    check(hal_xdr_decode_int(iptr, ilimit, &client.handle));
    check(hal_xdr_decode_int(iptr, ilimit, &pkey.handle));
    check(hal_xdr_decode_int(iptr, ilimit, &type));
    check(hal_xdr_decode_buffer_in_place(iptr, ilimit, &value, &value_len));

    ret = hal_rpc_pkey_set_attribute(pkey, type, value, value_len);

    return ret;
}

static hal_error_t pkey_get_attribute(const uint8_t **iptr, const uint8_t * const ilimit,
                                      uint8_t **optr, const uint8_t * const olimit)
{
    hal_client_handle_t client;
    hal_pkey_handle_t pkey;
    uint32_t type;
    size_t value_len;
    uint32_t value_max;
    uint8_t *optr_orig = *optr;
    hal_error_t ret;

    check(hal_xdr_decode_int(iptr, ilimit, &client.handle));
    check(hal_xdr_decode_int(iptr, ilimit, &pkey.handle));
    check(hal_xdr_decode_int(iptr, ilimit, &type));
    check(hal_xdr_decode_int(iptr, ilimit, &value_max));
    if (value_max > olimit - *optr - 4)
        return HAL_ERROR_RPC_PACKET_OVERFLOW;

    *optr += 4;
    ret = hal_rpc_pkey_get_attribute(pkey, type, *optr, &value_len, value_max);

    if (ret == HAL_OK) {
        *optr = optr_orig;
        check(hal_xdr_encode_int(optr, olimit, value_len));
        *optr += pad(value_len);
    }
    else {
        *optr = optr_orig;
    }

    return ret;
}

static hal_error_t pkey_delete_attribute(const uint8_t **iptr, const uint8_t * const ilimit,
                                         uint8_t **optr, const uint8_t * const olimit)
{
    hal_client_handle_t client;
    hal_pkey_handle_t pkey;
    uint32_t type;
    hal_error_t ret;

    check(hal_xdr_decode_int(iptr, ilimit, &client.handle));
    check(hal_xdr_decode_int(iptr, ilimit, &pkey.handle));
    check(hal_xdr_decode_int(iptr, ilimit, &type));

    ret = hal_rpc_pkey_delete_attribute(pkey, type);

    return ret;
}

hal_error_t hal_rpc_server_dispatch(const uint8_t * const ibuf, const size_t ilen,
                                    uint8_t * const obuf, size_t * const olen)
{
    const uint8_t * iptr = ibuf;
    const uint8_t * const ilimit = ibuf + ilen;
    uint8_t * optr = obuf + 12;	/* reserve space for opcode, client, and response code */
    const uint8_t * const olimit = obuf + *olen;
    uint32_t rpc_func_num;
    uint32_t client_handle;
    hal_error_t ret;
    hal_error_t (*handler)(const uint8_t **iptr, const uint8_t * const ilimit,
                           uint8_t **optr, const uint8_t * const olimit) = NULL;

    check(hal_xdr_decode_int(&iptr, ilimit, &rpc_func_num));
    check(hal_xdr_decode_int(&iptr, ilimit, &client_handle));
    check(hal_xdr_undecode_int(&iptr));

    switch (rpc_func_num) {
    case RPC_FUNC_GET_VERSION:
        handler = get_version;
        break;
    case RPC_FUNC_GET_RANDOM:
        handler = get_random;
        break;
    case RPC_FUNC_SET_PIN:
        handler = set_pin;
        break;
    case RPC_FUNC_LOGIN:
        handler = login;
        break;
    case RPC_FUNC_LOGOUT:
        handler = logout;
        break;
    case RPC_FUNC_LOGOUT_ALL:
        handler = logout_all;
        break;
    case RPC_FUNC_IS_LOGGED_IN:
        handler = is_logged_in;
        break;
    case RPC_FUNC_HASH_GET_DIGEST_LEN:
        handler = hash_get_digest_len;
        break;
    case RPC_FUNC_HASH_GET_DIGEST_ALGORITHM_ID:
        handler = hash_get_digest_algorithm_id;
        break;
    case RPC_FUNC_HASH_GET_ALGORITHM:
        handler = hash_get_algorithm;
        break;
    case RPC_FUNC_HASH_INITIALIZE:
        handler = hash_initialize;
        break;
    case RPC_FUNC_HASH_UPDATE:
        handler = hash_update;
        break;
    case RPC_FUNC_HASH_FINALIZE:
        handler = hash_finalize;
        break;
    case RPC_FUNC_PKEY_LOAD:
        handler = pkey_load;
        break;
    case RPC_FUNC_PKEY_FIND:
        handler = pkey_find;
        break;
    case RPC_FUNC_PKEY_GENERATE_RSA:
        handler = pkey_generate_rsa;
        break;
    case RPC_FUNC_PKEY_GENERATE_EC:
        handler = pkey_generate_ec;
        break;
    case RPC_FUNC_PKEY_CLOSE:
        handler = pkey_close;
        break;
    case RPC_FUNC_PKEY_DELETE:
        handler = pkey_delete;
        break;
    case RPC_FUNC_PKEY_GET_KEY_TYPE:
        handler = pkey_get_key_type;
        break;
    case RPC_FUNC_PKEY_GET_KEY_CURVE:
        handler = pkey_get_key_curve;
        break;
    case RPC_FUNC_PKEY_GET_KEY_FLAGS:
        handler = pkey_get_key_flags;
        break;
    case RPC_FUNC_PKEY_GET_PUBLIC_KEY_LEN:
        handler = pkey_get_public_key_len;
        break;
    case RPC_FUNC_PKEY_GET_PUBLIC_KEY:
        handler = pkey_get_public_key;
        break;
    case RPC_FUNC_PKEY_SIGN:
        handler = pkey_sign;
        break;
    case RPC_FUNC_PKEY_VERIFY:
        handler = pkey_verify;
        break;
    case RPC_FUNC_PKEY_LIST:
        handler = pkey_list;
        break;
    case RPC_FUNC_PKEY_MATCH:
        handler = pkey_match;
        break;
    case RPC_FUNC_PKEY_SET_ATTRIBUTE:
        handler = pkey_set_attribute;
        break;
    case RPC_FUNC_PKEY_GET_ATTRIBUTE:
        handler = pkey_get_attribute;
        break;
    case RPC_FUNC_PKEY_DELETE_ATTRIBUTE:
        handler = pkey_delete_attribute;
        break;
    }

    if (handler)
        ret = handler(&iptr, ilimit, &optr, olimit);
    else
        ret = HAL_ERROR_RPC_BAD_FUNCTION;

    /* Encode opcode, client ID, and response code at the beginning of the payload */
    *olen = optr - obuf;
    optr = obuf;
    check(hal_xdr_encode_int(&optr, olimit, rpc_func_num));
    check(hal_xdr_encode_int(&optr, olimit, client_handle));
    check(hal_xdr_encode_int(&optr, olimit, ret));
    return HAL_OK;
}

#define interrupt 0

static uint8_t inbuf[HAL_RPC_MAX_PKT_SIZE], outbuf[HAL_RPC_MAX_PKT_SIZE];

void hal_rpc_server_main(void)
{
    size_t ilen, olen;
    void *opaque;
    hal_error_t ret;

    while (!interrupt) {
        ilen = sizeof(inbuf);
        ret = hal_rpc_recvfrom(inbuf, &ilen, &opaque);
        if (ret == HAL_OK) {
            olen = sizeof(outbuf);
            if (hal_rpc_server_dispatch(inbuf, ilen, outbuf, &olen) == HAL_OK)
                hal_rpc_sendto(outbuf, olen, opaque);
        }
    }
}

/*
 * Dispatch vectors.
 */

#if RPC_CLIENT == RPC_CLIENT_LOCAL
const hal_rpc_misc_dispatch_t *hal_rpc_misc_dispatch = &hal_rpc_local_misc_dispatch;
const hal_rpc_hash_dispatch_t *hal_rpc_hash_dispatch = &hal_rpc_local_hash_dispatch;
const hal_rpc_pkey_dispatch_t *hal_rpc_pkey_dispatch = &hal_rpc_local_pkey_dispatch;
#endif

hal_error_t hal_rpc_server_init(void)
{
    hal_error_t err;

    if ((err = hal_ks_init(hal_ks_volatile_driver)) != HAL_OK ||
        (err = hal_ks_init(hal_ks_token_driver))    != HAL_OK ||
        (err = hal_rpc_server_transport_init())     != HAL_OK)
        return err;

    return HAL_OK;
}

hal_error_t hal_rpc_server_close(void)
{
    hal_error_t err;

    if ((err = hal_rpc_server_transport_close())        != HAL_OK ||
        (err = hal_ks_shutdown(hal_ks_token_driver))    != HAL_OK ||
        (err = hal_ks_shutdown(hal_ks_volatile_driver)) != HAL_OK)
        return err;

    return HAL_OK;
}


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