421 lines
10 KiB
C
421 lines
10 KiB
C
/* $OpenBSD: ssl_asn1.c,v 1.67 2023/07/08 16:40:13 beck Exp $ */
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/*
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* Copyright (c) 2016 Joel Sing <jsing@openbsd.org>
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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#include <limits.h>
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#include <openssl/ssl.h>
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#include <openssl/x509.h>
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#include "bytestring.h"
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#include "ssl_local.h"
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#define SSLASN1_TAG (CBS_ASN1_CONSTRUCTED | CBS_ASN1_CONTEXT_SPECIFIC)
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#define SSLASN1_TIME_TAG (SSLASN1_TAG | 1)
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#define SSLASN1_TIMEOUT_TAG (SSLASN1_TAG | 2)
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#define SSLASN1_PEER_CERT_TAG (SSLASN1_TAG | 3)
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#define SSLASN1_SESSION_ID_CTX_TAG (SSLASN1_TAG | 4)
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#define SSLASN1_VERIFY_RESULT_TAG (SSLASN1_TAG | 5)
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#define SSLASN1_HOSTNAME_TAG (SSLASN1_TAG | 6)
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#define SSLASN1_LIFETIME_TAG (SSLASN1_TAG | 9)
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#define SSLASN1_TICKET_TAG (SSLASN1_TAG | 10)
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static uint64_t
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time_max(void)
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{
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if (sizeof(time_t) == sizeof(int32_t))
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return INT32_MAX;
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if (sizeof(time_t) == sizeof(int64_t))
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return INT64_MAX;
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return 0;
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}
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static int
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SSL_SESSION_encode(SSL_SESSION *s, unsigned char **out, size_t *out_len,
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int ticket_encoding)
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{
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CBB cbb, session, cipher_suite, session_id, master_key, time, timeout;
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CBB peer_cert, sidctx, verify_result, hostname, lifetime, ticket, value;
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unsigned char *peer_cert_bytes = NULL;
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int len, rv = 0;
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uint16_t cid;
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if (!CBB_init(&cbb, 0))
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goto err;
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if (!CBB_add_asn1(&cbb, &session, CBS_ASN1_SEQUENCE))
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goto err;
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/* Session ASN1 version. */
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if (!CBB_add_asn1_uint64(&session, SSL_SESSION_ASN1_VERSION))
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goto err;
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/* TLS/SSL protocol version. */
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if (s->ssl_version < 0)
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goto err;
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if (!CBB_add_asn1_uint64(&session, s->ssl_version))
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goto err;
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/* Cipher suite ID. */
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/* XXX - require cipher to be non-NULL or always/only use cipher_id. */
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cid = (uint16_t)(s->cipher_id & SSL3_CK_VALUE_MASK);
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if (s->cipher != NULL)
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cid = ssl3_cipher_get_value(s->cipher);
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if (!CBB_add_asn1(&session, &cipher_suite, CBS_ASN1_OCTETSTRING))
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goto err;
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if (!CBB_add_u16(&cipher_suite, cid))
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goto err;
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/* Session ID - zero length for a ticket. */
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if (!CBB_add_asn1(&session, &session_id, CBS_ASN1_OCTETSTRING))
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goto err;
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if (!CBB_add_bytes(&session_id, s->session_id,
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ticket_encoding ? 0 : s->session_id_length))
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goto err;
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/* Master key. */
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if (!CBB_add_asn1(&session, &master_key, CBS_ASN1_OCTETSTRING))
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goto err;
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if (!CBB_add_bytes(&master_key, s->master_key, s->master_key_length))
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goto err;
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/* Time [1]. */
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if (s->time != 0) {
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if (s->time < 0)
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goto err;
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if (!CBB_add_asn1(&session, &time, SSLASN1_TIME_TAG))
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goto err;
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if (!CBB_add_asn1_uint64(&time, s->time))
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goto err;
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}
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/* Timeout [2]. */
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if (s->timeout != 0) {
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if (s->timeout < 0)
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goto err;
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if (!CBB_add_asn1(&session, &timeout, SSLASN1_TIMEOUT_TAG))
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goto err;
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if (!CBB_add_asn1_uint64(&timeout, s->timeout))
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goto err;
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}
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/* Peer certificate [3]. */
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if (s->peer_cert != NULL) {
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if ((len = i2d_X509(s->peer_cert, &peer_cert_bytes)) <= 0)
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goto err;
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if (!CBB_add_asn1(&session, &peer_cert, SSLASN1_PEER_CERT_TAG))
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goto err;
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if (!CBB_add_bytes(&peer_cert, peer_cert_bytes, len))
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goto err;
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}
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/* Session ID context [4]. */
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/* XXX - Actually handle this as optional? */
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if (!CBB_add_asn1(&session, &sidctx, SSLASN1_SESSION_ID_CTX_TAG))
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goto err;
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if (!CBB_add_asn1(&sidctx, &value, CBS_ASN1_OCTETSTRING))
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goto err;
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if (!CBB_add_bytes(&value, s->sid_ctx, s->sid_ctx_length))
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goto err;
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/* Verify result [5]. */
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if (s->verify_result != X509_V_OK) {
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if (s->verify_result < 0)
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goto err;
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if (!CBB_add_asn1(&session, &verify_result,
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SSLASN1_VERIFY_RESULT_TAG))
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goto err;
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if (!CBB_add_asn1_uint64(&verify_result, s->verify_result))
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goto err;
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}
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/* Hostname [6]. */
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if (s->tlsext_hostname != NULL) {
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if (!CBB_add_asn1(&session, &hostname, SSLASN1_HOSTNAME_TAG))
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goto err;
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if (!CBB_add_asn1(&hostname, &value, CBS_ASN1_OCTETSTRING))
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goto err;
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if (!CBB_add_bytes(&value, (const uint8_t *)s->tlsext_hostname,
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strlen(s->tlsext_hostname)))
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goto err;
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}
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/* PSK identity hint [7]. */
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/* PSK identity [8]. */
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/* Ticket lifetime hint [9]. */
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if (s->tlsext_tick_lifetime_hint > 0) {
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if (!CBB_add_asn1(&session, &lifetime, SSLASN1_LIFETIME_TAG))
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goto err;
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if (!CBB_add_asn1_uint64(&lifetime,
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s->tlsext_tick_lifetime_hint))
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goto err;
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}
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/* Ticket [10]. */
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if (s->tlsext_tick != NULL) {
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if (!CBB_add_asn1(&session, &ticket, SSLASN1_TICKET_TAG))
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goto err;
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if (!CBB_add_asn1(&ticket, &value, CBS_ASN1_OCTETSTRING))
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goto err;
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if (!CBB_add_bytes(&value, s->tlsext_tick, s->tlsext_ticklen))
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goto err;
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}
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/* Compression method [11]. */
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/* SRP username [12]. */
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if (!CBB_finish(&cbb, out, out_len))
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goto err;
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rv = 1;
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err:
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CBB_cleanup(&cbb);
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free(peer_cert_bytes);
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return rv;
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}
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int
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SSL_SESSION_ticket(SSL_SESSION *ss, unsigned char **out, size_t *out_len)
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{
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if (ss == NULL)
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return 0;
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if (ss->cipher == NULL && ss->cipher_id == 0)
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return 0;
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return SSL_SESSION_encode(ss, out, out_len, 1);
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}
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int
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i2d_SSL_SESSION(SSL_SESSION *ss, unsigned char **pp)
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{
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unsigned char *data = NULL;
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size_t data_len = 0;
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int rv = -1;
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if (ss == NULL)
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return 0;
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if (ss->cipher == NULL && ss->cipher_id == 0)
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return 0;
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if (!SSL_SESSION_encode(ss, &data, &data_len, 0))
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goto err;
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if (data_len > INT_MAX)
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goto err;
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if (pp != NULL) {
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if (*pp == NULL) {
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*pp = data;
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data = NULL;
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} else {
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memcpy(*pp, data, data_len);
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*pp += data_len;
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}
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}
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rv = (int)data_len;
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err:
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freezero(data, data_len);
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return rv;
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}
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LSSL_ALIAS(i2d_SSL_SESSION);
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SSL_SESSION *
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d2i_SSL_SESSION(SSL_SESSION **a, const unsigned char **pp, long length)
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{
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CBS cbs, session, cipher_suite, session_id, master_key, peer_cert;
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CBS hostname, ticket;
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uint64_t version, tls_version, stime, timeout, verify_result, lifetime;
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const unsigned char *peer_cert_bytes;
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uint16_t cipher_value;
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SSL_SESSION *s = NULL;
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size_t data_len;
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int present;
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if (a != NULL)
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s = *a;
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if (s == NULL) {
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if ((s = SSL_SESSION_new()) == NULL) {
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SSLerrorx(ERR_R_MALLOC_FAILURE);
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return (NULL);
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}
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}
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CBS_init(&cbs, *pp, length);
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if (!CBS_get_asn1(&cbs, &session, CBS_ASN1_SEQUENCE))
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goto err;
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/* Session ASN1 version. */
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if (!CBS_get_asn1_uint64(&session, &version))
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goto err;
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if (version != SSL_SESSION_ASN1_VERSION)
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goto err;
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/* TLS/SSL Protocol Version. */
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if (!CBS_get_asn1_uint64(&session, &tls_version))
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goto err;
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if (tls_version > INT_MAX)
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goto err;
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s->ssl_version = (int)tls_version;
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/* Cipher suite. */
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if (!CBS_get_asn1(&session, &cipher_suite, CBS_ASN1_OCTETSTRING))
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goto err;
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if (!CBS_get_u16(&cipher_suite, &cipher_value))
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goto err;
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if (CBS_len(&cipher_suite) != 0)
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goto err;
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/* XXX - populate cipher instead? */
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s->cipher = NULL;
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s->cipher_id = SSL3_CK_ID | cipher_value;
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/* Session ID. */
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if (!CBS_get_asn1(&session, &session_id, CBS_ASN1_OCTETSTRING))
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goto err;
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if (!CBS_write_bytes(&session_id, s->session_id, sizeof(s->session_id),
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&s->session_id_length))
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goto err;
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/* Master key. */
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if (!CBS_get_asn1(&session, &master_key, CBS_ASN1_OCTETSTRING))
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goto err;
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if (!CBS_write_bytes(&master_key, s->master_key, sizeof(s->master_key),
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&s->master_key_length))
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goto err;
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/* Time [1]. */
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s->time = time(NULL);
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if (!CBS_get_optional_asn1_uint64(&session, &stime, SSLASN1_TIME_TAG,
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0))
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goto err;
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if (stime > time_max())
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goto err;
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if (stime != 0)
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s->time = (time_t)stime;
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/* Timeout [2]. */
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s->timeout = 3;
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if (!CBS_get_optional_asn1_uint64(&session, &timeout,
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SSLASN1_TIMEOUT_TAG, 0))
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goto err;
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if (timeout > LONG_MAX)
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goto err;
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if (timeout != 0)
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s->timeout = (long)timeout;
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/* Peer certificate [3]. */
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X509_free(s->peer_cert);
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s->peer_cert = NULL;
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if (!CBS_get_optional_asn1(&session, &peer_cert, &present,
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SSLASN1_PEER_CERT_TAG))
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goto err;
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if (present) {
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data_len = CBS_len(&peer_cert);
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if (data_len > LONG_MAX)
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goto err;
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peer_cert_bytes = CBS_data(&peer_cert);
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if (d2i_X509(&s->peer_cert, &peer_cert_bytes,
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(long)data_len) == NULL)
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goto err;
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}
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/* Session ID context [4]. */
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s->sid_ctx_length = 0;
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if (!CBS_get_optional_asn1_octet_string(&session, &session_id, &present,
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SSLASN1_SESSION_ID_CTX_TAG))
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goto err;
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if (present) {
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if (!CBS_write_bytes(&session_id, (uint8_t *)&s->sid_ctx,
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sizeof(s->sid_ctx), &s->sid_ctx_length))
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goto err;
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}
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/* Verify result [5]. */
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s->verify_result = X509_V_OK;
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if (!CBS_get_optional_asn1_uint64(&session, &verify_result,
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SSLASN1_VERIFY_RESULT_TAG, X509_V_OK))
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goto err;
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if (verify_result > LONG_MAX)
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goto err;
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s->verify_result = (long)verify_result;
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/* Hostname [6]. */
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free(s->tlsext_hostname);
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s->tlsext_hostname = NULL;
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if (!CBS_get_optional_asn1_octet_string(&session, &hostname, &present,
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SSLASN1_HOSTNAME_TAG))
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goto err;
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if (present) {
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if (CBS_contains_zero_byte(&hostname))
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goto err;
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if (!CBS_strdup(&hostname, &s->tlsext_hostname))
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goto err;
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}
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/* PSK identity hint [7]. */
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/* PSK identity [8]. */
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/* Ticket lifetime [9]. */
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s->tlsext_tick_lifetime_hint = 0;
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if (!CBS_get_optional_asn1_uint64(&session, &lifetime,
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SSLASN1_LIFETIME_TAG, 0))
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goto err;
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if (lifetime > UINT32_MAX)
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goto err;
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if (lifetime > 0)
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s->tlsext_tick_lifetime_hint = (uint32_t)lifetime;
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/* Ticket [10]. */
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free(s->tlsext_tick);
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s->tlsext_tick = NULL;
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if (!CBS_get_optional_asn1_octet_string(&session, &ticket, &present,
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SSLASN1_TICKET_TAG))
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goto err;
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if (present) {
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if (!CBS_stow(&ticket, &s->tlsext_tick, &s->tlsext_ticklen))
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goto err;
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}
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/* Compression method [11]. */
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/* SRP username [12]. */
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*pp = CBS_data(&cbs);
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if (a != NULL)
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*a = s;
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return (s);
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err:
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ERR_asprintf_error_data("offset=%d", (int)(CBS_data(&cbs) - *pp));
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if (s != NULL && (a == NULL || *a != s))
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SSL_SESSION_free(s);
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return (NULL);
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}
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LSSL_ALIAS(d2i_SSL_SESSION);
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