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openssl/ssl/ssl_asn1.c
Todd Short 25959e04c3 Optimize session cache flushing 
Sort SSL_SESSION structures by timeout in the linked list.
Iterate over the linked list for timeout, stopping when no more
session can be flushed.
Do SSL_SESSION_free() outside of SSL_CTX lock
Update timeout upon use

Reviewed-by: Matt Caswell <matt@openssl.org>
Reviewed-by: Paul Dale <pauli@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/8687)
2021-06-10 18:32:25 +10:00

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/*
* Copyright 1995-2021 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/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;
} 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)
} 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;
long l;
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)in->time;
as.timeout = (int64_t)in->timeout;
as.verify_result = in->verify_result;
as.peer = in->peer;
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.alpn_selected, &alpn_selected,
in->ext.alpn_selected, in->ext.alpn_selected_len);
as.tlsext_max_fragment_len_mode = in->ext.max_fragment_len_mode;
if (in->ticket_appdata == NULL)
as.ticket_appdata = NULL;
else
ssl_session_oinit(&as.ticket_appdata, &ticket_appdata,
in->ticket_appdata, in->ticket_appdata_len);
return i2d_SSL_SESSION_ASN1(&as, pp);
}
/* Utility functions for d2i_SSL_SESSION */
/* OPENSSL_strndup an OCTET STRING */
static int ssl_session_strndup(char **pdst, ASN1_OCTET_STRING *src)
{
OPENSSL_free(*pdst);
*pdst = NULL;
if (src == NULL)
return 1;
*pdst = OPENSSL_strndup((char *)src->data, src->length);
if (*pdst == NULL)
return 0;
return 1;
}
/* Copy an OCTET STRING, return error if it exceeds maximum length */
static int ssl_session_memcpy(unsigned char *dst, size_t *pdstlen,
ASN1_OCTET_STRING *src, size_t maxlen)
{
if (src == NULL) {
*pdstlen = 0;
return 1;
}
if (src->length < 0 || src->length > (int)maxlen)
return 0;
memcpy(dst, src->data, src->length);
*pdstlen = src->length;
return 1;
}
SSL_SESSION *d2i_SSL_SESSION(SSL_SESSION **a, const unsigned char **pp,
long length)
{
long id;
size_t tmpl;
const unsigned char *p = *pp;
SSL_SESSION_ASN1 *as = NULL;
SSL_SESSION *ret = NULL;
as = d2i_SSL_SESSION_ASN1(NULL, &p, length);
/* ASN.1 code returns suitable error */
if (as == NULL)
goto err;
if (a == NULL || *a == NULL) {
ret = SSL_SESSION_new();
if (ret == NULL)
goto err;
} else {
ret = *a;
}
if (as->version != SSL_SESSION_ASN1_VERSION) {
ERR_raise(ERR_LIB_SSL, SSL_R_UNKNOWN_SSL_VERSION);
goto err;
}
if ((as->ssl_version >> 8) != SSL3_VERSION_MAJOR
&& (as->ssl_version >> 8) != DTLS1_VERSION_MAJOR
&& as->ssl_version != DTLS1_BAD_VER) {
ERR_raise(ERR_LIB_SSL, SSL_R_UNSUPPORTED_SSL_VERSION);
goto err;
}
ret->ssl_version = (int)as->ssl_version;
ret->kex_group = as->kex_group;
if (as->cipher->length != 2) {
ERR_raise(ERR_LIB_SSL, SSL_R_CIPHER_CODE_WRONG_LENGTH);
goto err;
}
id = 0x03000000L | ((unsigned long)as->cipher->data[0] << 8L)
| (unsigned long)as->cipher->data[1];
ret->cipher_id = id;
ret->cipher = ssl3_get_cipher_by_id(id);
if (ret->cipher == NULL)
goto err;
if (!ssl_session_memcpy(ret->session_id, &ret->session_id_length,
as->session_id, SSL3_MAX_SSL_SESSION_ID_LENGTH))
goto err;
if (!ssl_session_memcpy(ret->master_key, &tmpl,
as->master_key, TLS13_MAX_RESUMPTION_PSK_LENGTH))
goto err;
ret->master_key_length = tmpl;
if (as->time != 0)
ret->time = (time_t)as->time;
else
ret->time = time(NULL);
if (as->timeout != 0)
ret->timeout = (time_t)as->timeout;
else
ret->timeout = 3;
ssl_session_calculate_timeout(ret);
X509_free(ret->peer);
ret->peer = as->peer;
as->peer = NULL;
if (!ssl_session_memcpy(ret->sid_ctx, &ret->sid_ctx_length,
as->session_id_context, SSL_MAX_SID_CTX_LENGTH))
goto err;
/* NB: this defaults to zero which is X509_V_OK */
ret->verify_result = as->verify_result;
if (!ssl_session_strndup(&ret->ext.hostname, as->tlsext_hostname))
goto err;
#ifndef OPENSSL_NO_PSK
if (!ssl_session_strndup(&ret->psk_identity_hint, as->psk_identity_hint))
goto err;
if (!ssl_session_strndup(&ret->psk_identity, as->psk_identity))
goto err;
#endif
ret->ext.tick_lifetime_hint = (unsigned long)as->tlsext_tick_lifetime_hint;
ret->ext.tick_age_add = as->tlsext_tick_age_add;
OPENSSL_free(ret->ext.tick);
if (as->tlsext_tick != NULL) {
ret->ext.tick = as->tlsext_tick->data;
ret->ext.ticklen = as->tlsext_tick->length;
as->tlsext_tick->data = NULL;
} else {
ret->ext.tick = NULL;
}
#ifndef OPENSSL_NO_COMP
if (as->comp_id) {
if (as->comp_id->length != 1) {
ERR_raise(ERR_LIB_SSL, SSL_R_BAD_LENGTH);
goto err;
}
ret->compress_meth = as->comp_id->data[0];
} else {
ret->compress_meth = 0;
}
#endif
#ifndef OPENSSL_NO_SRP
if (!ssl_session_strndup(&ret->srp_username, as->srp_username))
goto err;
#endif /* OPENSSL_NO_SRP */
/* Flags defaults to zero which is fine */
ret->flags = (int32_t)as->flags;
ret->ext.max_early_data = as->max_early_data;
OPENSSL_free(ret->ext.alpn_selected);
if (as->alpn_selected != NULL) {
ret->ext.alpn_selected = as->alpn_selected->data;
ret->ext.alpn_selected_len = as->alpn_selected->length;
as->alpn_selected->data = NULL;
} else {
ret->ext.alpn_selected = NULL;
ret->ext.alpn_selected_len = 0;
}
ret->ext.max_fragment_len_mode = as->tlsext_max_fragment_len_mode;
OPENSSL_free(ret->ticket_appdata);
if (as->ticket_appdata != NULL) {
ret->ticket_appdata = as->ticket_appdata->data;
ret->ticket_appdata_len = as->ticket_appdata->length;
as->ticket_appdata->data = NULL;
} else {
ret->ticket_appdata = NULL;
ret->ticket_appdata_len = 0;
}
M_ASN1_free_of(as, SSL_SESSION_ASN1);
if ((a != NULL) && (*a == NULL))
*a = ret;
*pp = p;
return ret;
err:
M_ASN1_free_of(as, SSL_SESSION_ASN1);
if ((a == NULL) || (*a != ret))
SSL_SESSION_free(ret);
return NULL;
}
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