/*
 *  Common source code for SSL test programs. This file is included by
 *  both ssl_client2.c and ssl_server2.c and is intended for source
 *  code that is textually identical in both programs, but that cannot be
 *  compiled separately because it refers to types or macros that are
 *  different in the two programs, or because it would have an incomplete
 *  type.
 *
 *  This file is meant to be #include'd and cannot be compiled separately.
 *
 *  Copyright The Mbed TLS Contributors
 *  SPDX-License-Identifier: Apache-2.0 OR GPL-2.0-or-later
 */

#if defined(MBEDTLS_SSL_EXPORT_KEYS)
int eap_tls_key_derivation(void *p_expkey,
                           const unsigned char *ms,
                           const unsigned char *kb,
                           size_t maclen,
                           size_t keylen,
                           size_t ivlen,
                           const unsigned char client_random[32],
                           const unsigned char server_random[32],
                           mbedtls_tls_prf_types tls_prf_type)
{
    eap_tls_keys *keys = (eap_tls_keys *) p_expkey;

    ((void) kb);
    memcpy(keys->master_secret, ms, sizeof(keys->master_secret));
    memcpy(keys->randbytes, client_random, 32);
    memcpy(keys->randbytes + 32, server_random, 32);
    keys->tls_prf_type = tls_prf_type;

    if (opt.debug_level > 2) {
        mbedtls_printf("exported maclen is %u\n", (unsigned) maclen);
        mbedtls_printf("exported keylen is %u\n", (unsigned) keylen);
        mbedtls_printf("exported ivlen is %u\n", (unsigned) ivlen);
    }
    return 0;
}

int nss_keylog_export(void *p_expkey,
                      const unsigned char *ms,
                      const unsigned char *kb,
                      size_t maclen,
                      size_t keylen,
                      size_t ivlen,
                      const unsigned char client_random[32],
                      const unsigned char server_random[32],
                      mbedtls_tls_prf_types tls_prf_type)
{
    char nss_keylog_line[200];
    size_t const client_random_len = 32;
    size_t const master_secret_len = 48;
    size_t len = 0;
    size_t j;
    int ret = 0;

    ((void) p_expkey);
    ((void) kb);
    ((void) maclen);
    ((void) keylen);
    ((void) ivlen);
    ((void) server_random);
    ((void) tls_prf_type);

    len += sprintf(nss_keylog_line + len,
                   "%s", "CLIENT_RANDOM ");

    for (j = 0; j < client_random_len; j++) {
        len += sprintf(nss_keylog_line + len,
                       "%02x", client_random[j]);
    }

    len += sprintf(nss_keylog_line + len, " ");

    for (j = 0; j < master_secret_len; j++) {
        len += sprintf(nss_keylog_line + len,
                       "%02x", ms[j]);
    }

    len += sprintf(nss_keylog_line + len, "\n");
    nss_keylog_line[len] = '\0';

    mbedtls_printf("\n");
    mbedtls_printf("---------------- NSS KEYLOG -----------------\n");
    mbedtls_printf("%s", nss_keylog_line);
    mbedtls_printf("---------------------------------------------\n");

    if (opt.nss_keylog_file != NULL) {
        FILE *f;

        if ((f = fopen(opt.nss_keylog_file, "a")) == NULL) {
            ret = -1;
            goto exit;
        }

        if (fwrite(nss_keylog_line, 1, len, f) != len) {
            ret = -1;
            fclose(f);
            goto exit;
        }

        fclose(f);
    }

exit:
    mbedtls_platform_zeroize(nss_keylog_line,
                             sizeof(nss_keylog_line));
    return ret;
}

#if defined(MBEDTLS_SSL_DTLS_SRTP)
int dtls_srtp_key_derivation(void *p_expkey,
                             const unsigned char *ms,
                             const unsigned char *kb,
                             size_t maclen,
                             size_t keylen,
                             size_t ivlen,
                             const unsigned char client_random[32],
                             const unsigned char server_random[32],
                             mbedtls_tls_prf_types tls_prf_type)
{
    dtls_srtp_keys *keys = (dtls_srtp_keys *) p_expkey;

    ((void) kb);
    memcpy(keys->master_secret, ms, sizeof(keys->master_secret));
    memcpy(keys->randbytes, client_random, 32);
    memcpy(keys->randbytes + 32, server_random, 32);
    keys->tls_prf_type = tls_prf_type;

    if (opt.debug_level > 2) {
        mbedtls_printf("exported maclen is %u\n", (unsigned) maclen);
        mbedtls_printf("exported keylen is %u\n", (unsigned) keylen);
        mbedtls_printf("exported ivlen is %u\n", (unsigned) ivlen);
    }
    return 0;
}
#endif /* MBEDTLS_SSL_DTLS_SRTP */

#endif /* MBEDTLS_SSL_EXPORT_KEYS */

#if defined(MBEDTLS_SSL_RECORD_CHECKING)
int ssl_check_record(mbedtls_ssl_context const *ssl,
                     unsigned char const *buf, size_t len)
{
    int my_ret = 0, ret_cr1, ret_cr2;
    unsigned char *tmp_buf;

    /* Record checking may modify the input buffer,
     * so make a copy. */
    tmp_buf = mbedtls_calloc(1, len);
    if (tmp_buf == NULL) {
        return MBEDTLS_ERR_SSL_ALLOC_FAILED;
    }
    memcpy(tmp_buf, buf, len);

    ret_cr1 = mbedtls_ssl_check_record(ssl, tmp_buf, len);
    if (ret_cr1 != MBEDTLS_ERR_SSL_FEATURE_UNAVAILABLE) {
        /* Test-only: Make sure that mbedtls_ssl_check_record()
         *            doesn't alter state. */
        memcpy(tmp_buf, buf, len);   /* Restore buffer */
        ret_cr2 = mbedtls_ssl_check_record(ssl, tmp_buf, len);
        if (ret_cr2 != ret_cr1) {
            mbedtls_printf("mbedtls_ssl_check_record() returned inconsistent results.\n");
            my_ret = -1;
            goto cleanup;
        }

        switch (ret_cr1) {
            case 0:
                break;

            case MBEDTLS_ERR_SSL_INVALID_RECORD:
                if (opt.debug_level > 1) {
                    mbedtls_printf("mbedtls_ssl_check_record() detected invalid record.\n");
                }
                break;

            case MBEDTLS_ERR_SSL_INVALID_MAC:
                if (opt.debug_level > 1) {
                    mbedtls_printf("mbedtls_ssl_check_record() detected unauthentic record.\n");
                }
                break;

            case MBEDTLS_ERR_SSL_UNEXPECTED_RECORD:
                if (opt.debug_level > 1) {
                    mbedtls_printf("mbedtls_ssl_check_record() detected unexpected record.\n");
                }
                break;

            default:
                mbedtls_printf("mbedtls_ssl_check_record() failed fatally with -%#04x.\n",
                               (unsigned int) -ret_cr1);
                my_ret = -1;
                goto cleanup;
        }

        /* Regardless of the outcome, forward the record to the stack. */
    }

cleanup:
    mbedtls_free(tmp_buf);

    return my_ret;
}
#endif /* MBEDTLS_SSL_RECORD_CHECKING */

int recv_cb(void *ctx, unsigned char *buf, size_t len)
{
    io_ctx_t *io_ctx = (io_ctx_t *) ctx;
    size_t recv_len;
    int ret;

    if (opt.nbio == 2) {
        ret = delayed_recv(io_ctx->net, buf, len);
    } else {
        ret = mbedtls_net_recv(io_ctx->net, buf, len);
    }
    if (ret < 0) {
        return ret;
    }
    recv_len = (size_t) ret;

    if (opt.transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM) {
        /* Here's the place to do any datagram/record checking
         * in between receiving the packet from the underlying
         * transport and passing it on to the TLS stack. */
#if defined(MBEDTLS_SSL_RECORD_CHECKING)
        if (ssl_check_record(io_ctx->ssl, buf, recv_len) != 0) {
            return -1;
        }
#endif /* MBEDTLS_SSL_RECORD_CHECKING */
    }

    return (int) recv_len;
}

int recv_timeout_cb(void *ctx, unsigned char *buf, size_t len,
                    uint32_t timeout)
{
    io_ctx_t *io_ctx = (io_ctx_t *) ctx;
    int ret;
    size_t recv_len;

    ret = mbedtls_net_recv_timeout(io_ctx->net, buf, len, timeout);
    if (ret < 0) {
        return ret;
    }
    recv_len = (size_t) ret;

    if (opt.transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM) {
        /* Here's the place to do any datagram/record checking
         * in between receiving the packet from the underlying
         * transport and passing it on to the TLS stack. */
#if defined(MBEDTLS_SSL_RECORD_CHECKING)
        if (ssl_check_record(io_ctx->ssl, buf, recv_len) != 0) {
            return -1;
        }
#endif /* MBEDTLS_SSL_RECORD_CHECKING */
    }

    return (int) recv_len;
}

int send_cb(void *ctx, unsigned char const *buf, size_t len)
{
    io_ctx_t *io_ctx = (io_ctx_t *) ctx;

    if (opt.nbio == 2) {
        return delayed_send(io_ctx->net, buf, len);
    }

    return mbedtls_net_send(io_ctx->net, buf, len);
}

#if defined(MBEDTLS_X509_CRT_PARSE_C)
int ssl_sig_hashes_for_test[] = {
#if defined(MBEDTLS_SHA512_C)
    MBEDTLS_MD_SHA512,
    MBEDTLS_MD_SHA384,
#endif
#if defined(MBEDTLS_SHA256_C)
    MBEDTLS_MD_SHA256,
    MBEDTLS_MD_SHA224,
#endif
#if defined(MBEDTLS_SHA1_C)
    /* Allow SHA-1 as we use it extensively in tests. */
    MBEDTLS_MD_SHA1,
#endif
    MBEDTLS_MD_NONE
};
#endif /* MBEDTLS_X509_CRT_PARSE_C */