path: root/ssl/ssl_asn1.c

/*
 * Copyright 1995-2023 The OpenSSL Project Authors. All Rights Reserved.
 * Copyright 2005 Nokia. All rights reserved.
 *
 * Licensed under the Apache License 2.0 (the "License").  You may not use
 * this file except in compliance with the License.  You can obtain a copy
 * in the file LICENSE in the source distribution or at
 * https://www.openssl.org/source/license.html
 */

#include <stdio.h>
#include <stdlib.h>
#include "ssl_local.h"
#include <openssl/asn1t.h>
#include <openssl/encoder.h>
#include <openssl/x509.h>

typedef struct {
    uint32_t version;
    int32_t ssl_version;
    ASN1_OCTET_STRING *cipher;
    ASN1_OCTET_STRING *comp_id;
    ASN1_OCTET_STRING *master_key;
    ASN1_OCTET_STRING *session_id;
    ASN1_OCTET_STRING *key_arg;
    int64_t time;
    int64_t timeout;
    X509 *peer;
    ASN1_OCTET_STRING *session_id_context;
    int32_t verify_result;
    ASN1_OCTET_STRING *tlsext_hostname;
    uint64_t tlsext_tick_lifetime_hint;
    uint32_t tlsext_tick_age_add;
    ASN1_OCTET_STRING *tlsext_tick;
#ifndef OPENSSL_NO_PSK
    ASN1_OCTET_STRING *psk_identity_hint;
    ASN1_OCTET_STRING *psk_identity;
#endif
#ifndef OPENSSL_NO_SRP
    ASN1_OCTET_STRING *srp_username;
#endif
    uint64_t flags;
    uint32_t max_early_data;
    ASN1_OCTET_STRING *alpn_selected;
    uint32_t tlsext_max_fragment_len_mode;
    ASN1_OCTET_STRING *ticket_appdata;
    uint32_t kex_group;
    ASN1_OCTET_STRING *peer_rpk;
} SSL_SESSION_ASN1;

ASN1_SEQUENCE(SSL_SESSION_ASN1) = {
    ASN1_EMBED(SSL_SESSION_ASN1, version, UINT32),
    ASN1_EMBED(SSL_SESSION_ASN1, ssl_version, INT32),
    ASN1_SIMPLE(SSL_SESSION_ASN1, cipher, ASN1_OCTET_STRING),
    ASN1_SIMPLE(SSL_SESSION_ASN1, session_id, ASN1_OCTET_STRING),
    ASN1_SIMPLE(SSL_SESSION_ASN1, master_key, ASN1_OCTET_STRING),
    ASN1_IMP_OPT(SSL_SESSION_ASN1, key_arg, ASN1_OCTET_STRING, 0),
    ASN1_EXP_OPT_EMBED(SSL_SESSION_ASN1, time, ZINT64, 1),
    ASN1_EXP_OPT_EMBED(SSL_SESSION_ASN1, timeout, ZINT64, 2),
    ASN1_EXP_OPT(SSL_SESSION_ASN1, peer, X509, 3),
    ASN1_EXP_OPT(SSL_SESSION_ASN1, session_id_context, ASN1_OCTET_STRING, 4),
    ASN1_EXP_OPT_EMBED(SSL_SESSION_ASN1, verify_result, ZINT32, 5),
    ASN1_EXP_OPT(SSL_SESSION_ASN1, tlsext_hostname, ASN1_OCTET_STRING, 6),
#ifndef OPENSSL_NO_PSK
    ASN1_EXP_OPT(SSL_SESSION_ASN1, psk_identity_hint, ASN1_OCTET_STRING, 7),
    ASN1_EXP_OPT(SSL_SESSION_ASN1, psk_identity, ASN1_OCTET_STRING, 8),
#endif
    ASN1_EXP_OPT_EMBED(SSL_SESSION_ASN1, tlsext_tick_lifetime_hint, ZUINT64, 9),
    ASN1_EXP_OPT(SSL_SESSION_ASN1, tlsext_tick, ASN1_OCTET_STRING, 10),
    ASN1_EXP_OPT(SSL_SESSION_ASN1, comp_id, ASN1_OCTET_STRING, 11),
#ifndef OPENSSL_NO_SRP
    ASN1_EXP_OPT(SSL_SESSION_ASN1, srp_username, ASN1_OCTET_STRING, 12),
#endif
    ASN1_EXP_OPT_EMBED(SSL_SESSION_ASN1, flags, ZUINT64, 13),
    ASN1_EXP_OPT_EMBED(SSL_SESSION_ASN1, tlsext_tick_age_add, ZUINT32, 14),
    ASN1_EXP_OPT_EMBED(SSL_SESSION_ASN1, max_early_data, ZUINT32, 15),
    ASN1_EXP_OPT(SSL_SESSION_ASN1, alpn_selected, ASN1_OCTET_STRING, 16),
    ASN1_EXP_OPT_EMBED(SSL_SESSION_ASN1, tlsext_max_fragment_len_mode, ZUINT32, 17),
    ASN1_EXP_OPT(SSL_SESSION_ASN1, ticket_appdata, ASN1_OCTET_STRING, 18),
    ASN1_EXP_OPT_EMBED(SSL_SESSION_ASN1, kex_group, UINT32, 19),
    ASN1_EXP_OPT(SSL_SESSION_ASN1, peer_rpk, ASN1_OCTET_STRING, 20)
} static_ASN1_SEQUENCE_END(SSL_SESSION_ASN1)

IMPLEMENT_STATIC_ASN1_ENCODE_FUNCTIONS(SSL_SESSION_ASN1)

/* Utility functions for i2d_SSL_SESSION */

/* Initialise OCTET STRING from buffer and length */

static void ssl_session_oinit(ASN1_OCTET_STRING **dest, ASN1_OCTET_STRING *os,
                              const unsigned char *data, size_t len)
{
    os->data = (unsigned char *)data; /* justified cast: data is not modified */
    os->length = (int)len;
    os->flags = 0;
    *dest = os;
}

/* Initialise OCTET STRING from string */
static void ssl_session_sinit(ASN1_OCTET_STRING **dest, ASN1_OCTET_STRING *os,
                              const char *data)
{
    if (data != NULL)
        ssl_session_oinit(dest, os, (const unsigned char *)data, strlen(data));
    else
        *dest = NULL;
}

int i2d_SSL_SESSION(const SSL_SESSION *in, unsigned char **pp)
{

    SSL_SESSION_ASN1 as;

    ASN1_OCTET_STRING cipher;
    unsigned char cipher_data[2];
    ASN1_OCTET_STRING master_key, session_id, sid_ctx;

#ifndef OPENSSL_NO_COMP
    ASN1_OCTET_STRING comp_id;
    unsigned char comp_id_data;
#endif
    ASN1_OCTET_STRING tlsext_hostname, tlsext_tick;
#ifndef OPENSSL_NO_SRP
    ASN1_OCTET_STRING srp_username;
#endif
#ifndef OPENSSL_NO_PSK
    ASN1_OCTET_STRING psk_identity, psk_identity_hint;
#endif
    ASN1_OCTET_STRING alpn_selected;
    ASN1_OCTET_STRING ticket_appdata;
    ASN1_OCTET_STRING peer_rpk;

    long l;
    int ret;

    if ((in == NULL) || ((in->cipher == NULL) && (in->cipher_id == 0)))
        return 0;

    memset(&as, 0, sizeof(as));

    as.version = SSL_SESSION_ASN1_VERSION;
    as.ssl_version = in->ssl_version;

    as.kex_group = in->kex_group;

    if (in->cipher == NULL)
        l = in->cipher_id;
    else
        l = in->cipher->id;
    cipher_data[0] = ((unsigned char)(l >> 8L)) & 0xff;
    cipher_data[1] = ((unsigned char)(l)) & 0xff;

    ssl_session_oinit(&as.cipher, &cipher, cipher_data, 2);

#ifndef OPENSSL_NO_COMP
    if (in->compress_meth) {
        comp_id_data = (unsigned char)in->compress_meth;
        ssl_session_oinit(&as.comp_id, &comp_id, &comp_id_data, 1);
    }
#endif

    ssl_session_oinit(&as.master_key, &master_key,
                      in->master_key, in->master_key_length);

    ssl_session_oinit(&as.session_id, &session_id,
                      in->session_id, in->session_id_length);

    ssl_session_oinit(&as.session_id_context, &sid_ctx,
                      in->sid_ctx, in->sid_ctx_length);

    as.time = (int64_t)ossl_time_to_time_t(in->time);
    as.timeout = (int64_t)ossl_time2seconds(in->timeout);
    as.verify_result = in->verify_result;

    as.peer = in->peer;

    as.peer_rpk = NULL;
    peer_rpk.data = NULL;
    if (in->peer_rpk != NULL) {
        peer_rpk.length = i2d_PUBKEY(in->peer_rpk, &peer_rpk.data);
        if (peer_rpk.length > 0 && peer_rpk.data != NULL)
            as.peer_rpk = &peer_rpk;
    }

    ssl_session_sinit(&as.tlsext_hostname, &tlsext_hostname,
                      in->ext.hostname);
    if (in->ext.tick) {
        ssl_session_oinit(&as.tlsext_tick, &tlsext_tick,
                          in->ext.tick, in->ext.ticklen);
    }
    if (in->ext.tick_lifetime_hint > 0)
        as.tlsext_tick_lifetime_hint = in->ext.tick_lifetime_hint;
    as.tlsext_tick_age_add = in->ext.tick_age_add;
#ifndef OPENSSL_NO_PSK
    ssl_session_sinit(&as.psk_identity_hint, &psk_identity_hint,
                      in->psk_identity_hint);
    ssl_session_sinit(&as.psk_identity, &psk_identity, in->psk_identity);
#endif                          /* OPENSSL_NO_PSK */
#ifndef OPENSSL_NO_SRP
    ssl_session_sinit(&as.srp_username, &srp_username, in->srp_username);
#endif                          /* OPENSSL_NO_SRP */

    as.flags = in->flags;
    as.max_early_data = in->ext.max_early_data;

    if (in->ext.alpn_selected == NULL)
        as.alpn_selected = NULL;
    else
        ssl_session_oinit(&as