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apache/modules/ssl/ssl_engine_vars.c
Joe Orton e9915b2bdb mod_ssl: Add SSLClientHelloVars directive which exposes various 
ClientHello properties in new SSL_CLIENTHELLO_* variables.

* modules/ssl/ssl_engine_kernel.c (ssl_hook_Fixup_vars): Add
  SSL_CLIENTHELLO_* vars.
  (copy_clienthello_vars): New function.
  (ssl_callback_ClientHello): Call it when needed.

* modules/ssl/ssl_engine_vars.c (ssl_var_lookup_ssl_clienthello): New
  function.
  (ssl_var_lookup_ssl): Call it for SSL_CLIENTHELLO_*.

* modules/ssl/ssl_private.h (modssl_clienthello_vars): Add type.
  (SSLConnRec): Add clienthello_vars pointer.

* modules/ssl/ssl_engine_config.c, modules/ssl/mod_ssl.c: Add handling
  of new SSLClientHelloVars directive.

Submitted by: Charles Smutz <csmutz gmail.com>
Github: closes #483


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@1921074 13f79535-47bb-0310-9956-ffa450edef68
2024-10-01 16:09:11 +00:00

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/* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/* _ _
* _ __ ___ ___ __| | ___ ___| | mod_ssl
* | '_ ` _ \ / _ \ / _` | / __/ __| | Apache Interface to OpenSSL
* | | | | | | (_) | (_| | \__ \__ \ |
* |_| |_| |_|\___/ \__,_|___|___/___/_|
* |_____|
* ssl_engine_vars.c
* Variable Lookup Facility
*/
/* ``Those of you who think they
know everything are very annoying
to those of us who do.''
-- Unknown */
#include "ssl_private.h"
#include "mod_ssl.h"
#include "ap_expr.h"
#include "apr_time.h"
/* _________________________________________________________________
**
** Variable Lookup
** _________________________________________________________________
*/
static const char *ssl_var_lookup_ssl(apr_pool_t *p, const SSLConnRec *sslconn, request_rec *r, const char *var);
static const char *ssl_var_lookup_ssl_cert(apr_pool_t *p, request_rec *r, X509 *xs, const char *var);
static const char *ssl_var_lookup_ssl_cert_dn(apr_pool_t *p, X509_NAME *xsname, const char *var);
static const char *ssl_var_lookup_ssl_cert_san(apr_pool_t *p, X509 *xs, const char *var);
static const char *ssl_var_lookup_ssl_cert_valid(apr_pool_t *p, ASN1_TIME *tm);
static const char *ssl_var_lookup_ssl_cert_remain(apr_pool_t *p, ASN1_TIME *tm);
static const char *ssl_var_lookup_ssl_cert_serial(apr_pool_t *p, X509 *xs);
static const char *ssl_var_lookup_ssl_cert_chain(apr_pool_t *p, STACK_OF(X509) *sk, const char *var, int pem);
static const char *ssl_var_lookup_ssl_cert_rfc4523_cea(apr_pool_t *p, SSL *ssl);
static const char *ssl_var_lookup_ssl_cert_verify(apr_pool_t *p, const SSLConnRec *sslconn);
static const char *ssl_var_lookup_ssl_cipher(apr_pool_t *p, const SSLConnRec *sslconn, const char *var);
static void ssl_var_lookup_ssl_cipher_bits(SSL *ssl, int *usekeysize, int *algkeysize);
static const char *ssl_var_lookup_ssl_handshake_rtt(apr_pool_t *p, SSL *ssl);
static const char *ssl_var_lookup_ssl_clienthello(apr_pool_t *p, const SSLConnRec *sslconn, const char *var);
static const char *ssl_var_lookup_ssl_version(const char *var);
static const char *ssl_var_lookup_ssl_compress_meth(SSL *ssl);
static const SSLConnRec *ssl_get_effective_config(conn_rec *c)
{
const SSLConnRec *sslconn = myConnConfig(c);
if (!(sslconn && sslconn->ssl) && c->master) {
/* use master connection if no SSL defined here */
sslconn = myConnConfig(c->master);
}
return sslconn;
}
static int ssl_conn_is_ssl(conn_rec *c)
{
const SSLConnRec *sslconn = ssl_get_effective_config(c);
return (sslconn && sslconn->ssl)? OK : DECLINED;
}
/* Returns certificate data, either PEM encoded if 'pem' is non-zero,
* else plain base64-encoded DER. */
static const char *ssl_var_lookup_ssl_cert_data(apr_pool_t *p, X509 *xs,
int pem)
{
BIO *bio;
if ((bio = BIO_new(BIO_s_mem())) == NULL)
return NULL;
if (pem) {
PEM_write_bio_X509(bio, xs);
}
else {
BIO *b64 = BIO_new(BIO_f_base64());
if (b64 == NULL) {
BIO_free(bio);
return NULL;
}
BIO_set_flags(b64, BIO_FLAGS_BASE64_NO_NL);
b64 = BIO_push(b64, bio);
i2d_X509_bio(b64, xs);
(void)BIO_flush(b64); /* ensures trailing bytes are padded */
BIO_pop(b64);
BIO_free(b64);
}
return modssl_bio_free_read(p, bio);
}
/* SSLv3 uses 36 bytes for Finishd messages, TLS1.0 12 bytes,
* So tls-unique is max 36 bytes, however with tls-server-end-point,
* the CB data is the certificate signature, so we use the maximum
* hash size known to the library (currently 64).
* */
#define TLS_CB_MAX EVP_MAX_MD_SIZE
#define TLS_UNIQUE_PREFIX "tls-unique:"
#define TLS_SERVER_END_POINT_PREFIX "tls-server-end-point:"
static apr_status_t ssl_get_tls_cb(apr_pool_t *p, conn_rec *c, const char *type,
unsigned char **buf, apr_size_t *size)
{
const SSLConnRec *sslconn = ssl_get_effective_config(c);
const char *prefix;
apr_size_t preflen;
const unsigned char *data;
unsigned char cb[TLS_CB_MAX], *retbuf;
unsigned int l = 0;
X509 *x = NULL;
if (!sslconn || !sslconn->ssl) {
return APR_EGENERAL;
}
if (strcEQ(type, "SERVER_TLS_UNIQUE")) {
l = SSL_get_peer_finished(sslconn->ssl, cb, TLS_CB_MAX);
}
else if (strcEQ(type, "CLIENT_TLS_UNIQUE")) {
l = SSL_get_finished(sslconn->ssl, cb, TLS_CB_MAX);
}
else if (strcEQ(type, "SERVER_TLS_SERVER_END_POINT")) {
x = SSL_get_certificate(sslconn->ssl);
/* Increase refcount so X509_free below works for both client
* and server cases. */
if (x) X509_up_ref(x);
}
else if (strcEQ(type, "CLIENT_TLS_SERVER_END_POINT")) {
x = SSL_get_peer_certificate(sslconn->ssl);
}
if (l > 0) {
preflen = sizeof(TLS_UNIQUE_PREFIX) -1;
prefix = TLS_UNIQUE_PREFIX;
data = cb;
}
else if (x != NULL) {
const EVP_MD *md;
#if MODSSL_USE_OPENSSL_PRE_1_1_API
md = EVP_get_digestbynid(OBJ_obj2nid(x->sig_alg->algorithm));
#else
md = EVP_get_digestbynid(X509_get_signature_nid(x));
#endif
/* Override digest as specified by RFC 5929 section 4.1. */
if (md == NULL || md == EVP_md5() || md == EVP_sha1()) {
md = EVP_sha256();
}
if (!X509_digest(x, md, cb, &l)) {
return APR_EGENERAL;
}
preflen = sizeof(TLS_SERVER_END_POINT_PREFIX) - 1;
prefix = TLS_SERVER_END_POINT_PREFIX;
data = cb;
X509_free(x);
}
else {
return APR_EGENERAL;
}
retbuf = apr_palloc(p, preflen + l);
memcpy(retbuf, prefix, preflen);
memcpy(&retbuf[preflen], data, l);
*size = preflen + l;
*buf = retbuf;
return APR_SUCCESS;
}
static const char var_interface[] = "mod_ssl/" AP_SERVER_BASEREVISION;
static char var_library_interface[] = MODSSL_LIBRARY_TEXT;
static char *var_library = NULL;
static apr_array_header_t *expr_peer_ext_list_fn(ap_expr_eval_ctx_t *ctx,
const void *dummy,
const char *arg)
{
return ssl_ext_list(ctx->p, ctx->c, 1, arg);
}
static const char *expr_var_fn(ap_expr_eval_ctx_t *ctx, const void *data)
{
const char *var = data;
const SSLConnRec *sslconn = ssl_get_effective_config(ctx->c);
return sslconn ? ssl_var_lookup_ssl(ctx->p, sslconn, ctx->r, var) : NULL;
}
static const char *expr_func_fn(ap_expr_eval_ctx_t *ctx, const void *data,
const char *arg)
{
const char *var = arg;
return var ? ssl_var_lookup(ctx->p, ctx->s, ctx->c, ctx->r, var) : NULL;
}
static int ssl_expr_lookup(ap_expr_lookup_parms *parms)
{
switch (parms->type) {
case AP_EXPR_FUNC_VAR:
/* for now, we just handle everything that starts with SSL_, but
* register our hook as APR_HOOK_LAST
* XXX: This can be optimized
*/
if (strcEQn(parms->name, "SSL_", 4)) {
*parms->func = expr_var_fn;
*parms->data = parms->name + 4;
return OK;
}
break;
case AP_EXPR_FUNC_STRING:
/* Function SSL() is implemented by us.
*/
if (strcEQ(parms->name, "SSL")) {
*parms->func = expr_func_fn;
*parms->data = NULL;
return OK;
}
break;
case AP_EXPR_FUNC_LIST:
if (strcEQ(parms->name, "PeerExtList")) {
*parms->func = expr_peer_ext_list_fn;
*parms->data = "PeerExtList";
return OK;
}
break;
}
return DECLINED;
}
void ssl_var_register(apr_pool_t *p)
{
char *cp, *cp2;
ap_hook_ssl_conn_is_ssl(ssl_conn_is_ssl, NULL, NULL, APR_HOOK_MIDDLE);
APR_REGISTER_OPTIONAL_FN(ssl_get_tls_cb);
APR_REGISTER_OPTIONAL_FN(ssl_var_lookup);
APR_REGISTER_OPTIONAL_FN(ssl_ext_list);
/* Perform once-per-process library version determination: */
var_library = apr_pstrdup(p, MODSSL_LIBRARY_DYNTEXT);
if ((cp = strchr(var_library, ' ')) != NULL) {
*cp = '/';
if ((cp2 = strchr(cp, ' ')) != NULL)
*cp2 = NUL;
}
if ((cp = strchr(var_library_interface, ' ')) != NULL) {
*cp = '/';
if ((cp2 = strchr(cp, ' ')) != NULL)
*cp2 = NUL;
}
ap_hook_expr_lookup(ssl_expr_lookup, NULL, NULL, APR_HOOK_MIDDLE);
}
/* This function must remain safe to use for a non-SSL connection. */
const char *ssl_var_lookup(apr_pool_t *p, server_rec *s,
conn_rec *c, request_rec *r,
const char *var)
{
const char *result = NULL;
apr_time_exp_t tm;
/*
* Request dependent stuff
*/
if (r != NULL) {
switch (var[0]) {
case 'H':
case 'h':
if (strcEQ(var, "HTTP_USER_AGENT"))
result = apr_table_get(r->headers_in, "User-Agent");
else if (strcEQ(var, "HTTP_REFERER"))
result = apr_table_get(r->headers_in, "Referer");
else if (strcEQ(var, "HTTP_COOKIE"))
result = apr_table_get(r->headers_in, "Cookie");
else if (strcEQ(var, "HTTP_FORWARDED"))
result = apr_table_get(r->headers_in, "Forwarded");
else if (strcEQ(var, "HTTP_HOST"))
result = apr_table_get(r->headers_in, "Host");
else if (strcEQ(var, "HTTP_PROXY_CONNECTION"))
result = apr_table_get(r->headers_in, "Proxy-Connection");
else if (strcEQ(var, "HTTP_ACCEPT"))
result = apr_table_get(r->headers_in, "Accept");
else if (strlen(var) > 5 && strcEQn(var, "HTTP:", 5))
/* all other headers from which we are still not know about */
result = apr_table_get(r->headers_in, var+5);
break;
case 'R':
case 'r':
if (strcEQ(var, "REQUEST_METHOD"))
result = r->method;
else if (strcEQ(var, "REQUEST_SCHEME"))
result = ap_http_scheme(r);
else if (strcEQ(var, "REQUEST_URI"))
result = r->uri;
else if (strcEQ(var, "REQUEST_FILENAME"))
result = r->filename;
else if (strcEQ(var, "REMOTE_ADDR"))
result = r->useragent_ip;
else if (strcEQ(var, "REMOTE_HOST"))
result = ap_get_useragent_host(r, REMOTE_NAME, NULL);
else if (strcEQ(var, "REMOTE_IDENT"))
result = ap_get_remote_logname(r);
else if (strcEQ(var, "REMOTE_USER"))
result = r->user;
break;
case 'S':
case 's':
if (strcEQn(var, "SSL", 3)) break; /* shortcut common case */
if (strcEQ(var, "SERVER_ADMIN"))
result = r->server->server_admin;
else if (strcEQ(var, "SERVER_NAME"))
result = ap_get_server_name_for_url(r);
else if (strcEQ(var, "SERVER_PORT"))
result = apr_psprintf(p, "%u", ap_get_server_port(r));
else if (strcEQ(var, "SERVER_PROTOCOL"))
result = r->protocol;
else if (strcEQ(var, "SCRIPT_FILENAME"))
result = r->filename;
break;
default:
if (strcEQ(var, "PATH_INFO"))
result = r->path_info;
else if (strcEQ(var, "QUERY_STRING"))
result = r->args;
else if (strcEQ(var, "IS_SUBREQ"))
result = (r->main != NULL ? "true" : "false");
else if (strcEQ(var, "DOCUMENT_ROOT"))
result = ap_document_root(r);
else if (strcEQ(var, "AUTH_TYPE"))
result = r->ap_auth_type;
else if (strcEQ(var, "THE_REQUEST"))
result = r->the_request;
else if (strlen(var) > 4 && strcEQn(var, "ENV:", 4)) {
result = apr_table_get(r->notes, var+4);
if (result == NULL)
result = apr_table_get(r->subprocess_env, var+4);
}
break;
}
}
/*
* Connection stuff
*/
if (result == NULL && c != NULL) {
const SSLConnRec *sslconn = ssl_get_effective_config(c);
if (strlen(var) > 4 && strcEQn(var, "SSL_", 4)
&& sslconn && sslconn->ssl)
result = ssl_var_lookup_ssl(p, sslconn, r, var+4);
else if (strcEQ(var, "HTTPS")) {
if (sslconn && sslconn->ssl)
result = "on";
else
result = "off";
}
}
/*
* Totally independent stuff
*/
if (result == NULL) {
if (strlen(var) > 12 && strcEQn(var, "SSL_VERSION_", 12))
result = ssl_var_lookup_ssl_version(var+12);
else if (strcEQ(var, "SERVER_SOFTWARE"))
result = ap_get_server_banner();
else if (strcEQ(var, "API_VERSION")) {
result = apr_itoa(p, MODULE_MAGIC_NUMBER_MAJOR);
}
else if (strcEQ(var, "TIME_YEAR")) {
apr_time_exp_lt(&tm, apr_time_now());
result = apr_psprintf(p, "%02d%02d",
(tm.tm_year / 100) + 19, tm.tm_year % 100);
}
#define MKTIMESTR(format, tmfield) \
apr_time_exp_lt(&tm, apr_time_now()); \
result = apr_psprintf(p, format, tm.tmfield);
else if (strcEQ(var, "TIME_MON")) {
MKTIMESTR("%02d", tm_mon+1)
}
else if (strcEQ(var, "TIME_DAY")) {
MKTIMESTR("%02d", tm_mday)
}
else if (strcEQ(var, "TIME_HOUR")) {
MKTIMESTR("%02d", tm_hour)
}
else if (strcEQ(var, "TIME_MIN")) {
MKTIMESTR("%02d", tm_min)
}
else if (strcEQ(var, "TIME_SEC")) {
MKTIMESTR("%02d", tm_sec)
}
else if (strcEQ(var, "TIME_WDAY")) {
MKTIMESTR("%d", tm_wday)
}
else if (strcEQ(var, "TIME")) {
apr_time_exp_lt(&tm, apr_time_now());
result = apr_psprintf(p,
"%02d%02d%02d%02d%02d%02d%02d", (tm.tm_year / 100) + 19,
(tm.tm_year % 100), tm.tm_mon+1, tm.tm_mday,
tm.tm_hour, tm.tm_min, tm.tm_sec);
}
/* all other env-variables from the parent Apache process */
else if (strlen(var) > 4 && strcEQn(var, "ENV:", 4)) {
result = getenv(var+4);
}
}
return result ? result : "";
}
static const char *ssl_var_lookup_ssl(apr_pool_t *p, const SSLConnRec *sslconn,
request_rec *r, const char *var)
{
const char *result;
X509 *xs;
STACK_OF(X509) *sk;
SSL *ssl;
result = NULL;
ssl = sslconn->ssl;
if (strlen(var) > 8 && strcEQn(var, "VERSION_", 8)) {
result = ssl_var_lookup_ssl_version(var+8);
}
else if (ssl != NULL && strcEQ(var, "PROTOCOL")) {
result = SSL_get_version(ssl);
}
else if (ssl != NULL && strcEQ(var, "SESSION_ID")) {
char buf[MODSSL_SESSION_ID_STRING_LEN];
SSL_SESSION *pSession = SSL_get_session(ssl);
if (pSession) {
IDCONST unsigned char *id;
unsigned int idlen;
#ifdef OPENSSL_NO_SSL_INTERN
id = (unsigned char *)SSL_SESSION_get_id(pSession, &idlen);
#else
id = pSession->session_id;
idlen = pSession->session_id_length;
#endif
result = apr_pstrdup(p, modssl_SSL_SESSION_id2sz(id, idlen,
buf, sizeof(buf)));
}
}
else if(ssl != NULL && strcEQ(var, "SESSION_RESUMED")) {
if (SSL_session_reused(ssl) == 1)
result = "Resumed";
else
result = "Initial";
}
else if (ssl != NULL && strlen(var) >= 6 && strcEQn(var, "CIPHER", 6)) {
result = ssl_var_lookup_ssl_cipher(p, sslconn, var+6);
}
else if (ssl != NULL && strcEQ(var, "HANDSHAKE_RTT")) {
result = ssl_var_lookup_ssl_handshake_rtt(p, ssl);
}
else if (ssl != NULL && strlen(var) >= 12 && strcEQn(var, "CLIENTHELLO_", 12)) {
result = ssl_var_lookup_ssl_clienthello(p, sslconn, var+12);
}
else if (ssl != NULL && strlen(var) > 18 && strcEQn(var, "CLIENT_CERT_CHAIN_", 18)) {
sk = SSL_get_peer_cert_chain(ssl);
result = ssl_var_lookup_ssl_cert_chain(p, sk, var+18, 1);
}
else if (ssl != NULL && strlen(var) > 21 && strcEQn(var, "CLIENT_B64CERT_CHAIN_", 21)) {
sk = SSL_get_peer_cert_chain(ssl);
result = ssl_var_lookup_ssl_cert_chain(p, sk, var+21, 0);
}
else if (ssl != NULL && strcEQ(var, "CLIENT_CERT_RFC4523_CEA")) {
result = ssl_var_lookup_ssl_cert_rfc4523_cea(p, ssl);
}
else if (ssl != NULL && strcEQ(var, "CLIENT_VERIFY")) {
result = ssl_var_lookup_ssl_cert_verify(p, sslconn);
}
else if (ssl != NULL && strcEQ(var, "CLIENT_VERIFY_ERRSTR")) {
result = sslconn->verify_error;
}
else if (ssl != NULL && strlen(var) > 7 && strcEQn(var, "CLIENT_", 7)) {
if ((xs = SSL_get_peer_certificate(ssl)) != NULL) {
result = ssl_var_lookup_ssl_cert(p, r, xs, var+7);
X509_free(xs);
}
}
else if (ssl != NULL && strlen(var) > 7 && strcEQn(var, "SERVER_", 7)) {
if ((xs = SSL_get_certificate(ssl)) != NULL) {
result = ssl_var_lookup_ssl_cert(p, r, xs, var+7);
/* SSL_get_certificate is different from SSL_get_peer_certificate.
* No need to X509_free(xs).
*/
}
}
else if (ssl != NULL && strcEQ(var, "COMPRESS_METHOD")) {
result = ssl_var_lookup_ssl_compress_meth(ssl);
}
else if (ssl != NULL && strcEQ(var, "SHARED_CIPHERS")) {
char buf[HUGE_STRING_LEN * 2];
if (SSL_get_shared_ciphers(ssl, buf, sizeof(buf)))
result = apr_pstrdup(p, buf);
}
#ifdef HAVE_TLSEXT
else if (ssl != NULL && strcEQ(var, "TLS_SNI")) {
result = apr_pstrdup(p, SSL_get_servername(ssl,
TLSEXT_NAMETYPE_host_name));
}
#endif
else if (ssl != NULL && strcEQ(var, "SECURE_RENEG")) {
int flag = 0;
#ifdef SSL_get_secure_renegotiation_support
flag = SSL_get_secure_renegotiation_support(ssl);
#endif
result = flag ? "true" : "false";
}
#ifdef HAVE_SRP
else if (ssl != NULL && strcEQ(var, "SRP_USER")) {
if ((result = SSL_get_srp_username(ssl)) != NULL) {
result = apr_pstrdup(p, result);
}
}
else if (ssl != NULL && strcEQ(var, "SRP_USERINFO")) {
if ((result = SSL_get_srp_userinfo(ssl)) != NULL) {
result = apr_pstrdup(p, result);
}
}
#endif
return result;
}
static const char *ssl_var_lookup_ssl_cert_dn_oneline(apr_pool_t *p, request_rec *r,
X509_NAME *xsname)
{
char *result = NULL;
SSLDirConfigRec *dc;
int legacy_format = 0;
if (r) {
dc = myDirConfig(r);
legacy_format = dc->nOptions & SSL_OPT_LEGACYDNFORMAT;
}
if (legacy_format) {
char *cp = X509_NAME_oneline(xsname, NULL, 0);
result = apr_pstrdup(p, cp);
OPENSSL_free(cp);
}
else {
BIO* bio;
unsigned long flags = XN_FLAG_RFC2253 & ~ASN1_STRFLGS_ESC_MSB;
if ((bio = BIO_new(BIO_s_mem())) == NULL)
return NULL;
X509_NAME_print_ex(bio, xsname, 0, flags);
result = modssl_bio_free_read(p, bio);
}
return result;
}
static const char *ssl_var_lookup_ssl_cert(apr_pool_t *p, request_rec *r, X509 *xs,
const char *var)
{
const char *result;
X509_NAME *xsname;
int nid;
result = NULL;
if (strcEQ(var, "M_VERSION")) {
result = apr_psprintf(p, "%lu", X509_get_version(xs)+1);
}
else if (strcEQ(var, "M_SERIAL")) {
result = ssl_var_lookup_ssl_cert_serial(p, xs);
}
else if (strcEQ(var, "V_START")) {
result = ssl_var_lookup_ssl_cert_valid(p, X509_get_notBefore(xs));
}
else if (strcEQ(var, "V_END")) {
result = ssl_var_lookup_ssl_cert_valid(p, X509_get_notAfter(xs));
}
else if (strcEQ(var, "V_REMAIN")) {
result = ssl_var_lookup_ssl_cert_remain(p, X509_get_notAfter(xs));
}
else if (*var && strcEQ(var+1, "_DN")) {
if (*var == 'S')
xsname = X509_get_subject_name(xs);
else if (*var == 'I')
xsname = X509_get_issuer_name(xs);
else
return NULL;
result = ssl_var_lookup_ssl_cert_dn_oneline(p, r, xsname);
}
else if (strlen(var) > 5 && strcEQn(var+1, "_DN_", 4)) {
if (*var == 'S')
xsname = X509_get_subject_name(xs);
else if (*var == 'I')
xsname = X509_get_issuer_name(xs);
else
return NULL;
result = ssl_var_lookup_ssl_cert_dn(p, xsname, var+5);
}
else if (strlen(var) > 4 && strcEQn(var, "SAN_", 4)) {
result = ssl_var_lookup_ssl_cert_san(p, xs, var+4);
}
else if (strcEQ(var, "A_SIG")) {
#if MODSSL_USE_OPENSSL_PRE_1_1_API
nid = OBJ_obj2nid((ASN1_OBJECT *)(xs->cert_info->signature->algorithm));
#else
const ASN1_OBJECT *paobj;
X509_ALGOR_get0(&paobj, NULL, NULL, X509_get0_tbs_sigalg(xs));
nid = OBJ_obj2nid(paobj);
#endif
result = (nid == NID_undef) ? "UNKNOWN" : OBJ_nid2ln(nid);
}
else if (strcEQ(var, "A_KEY")) {
#if OPENSSL_VERSION_NUMBER < 0x10100000L
nid = OBJ_obj2nid((ASN1_OBJECT *)(xs->cert_info->key->algor->algorithm));
#else
ASN1_OBJECT *paobj;
X509_PUBKEY_get0_param(&paobj, NULL, 0, NULL, X509_get_X509_PUBKEY(xs));
nid = OBJ_obj2nid(paobj);
#endif
result = (nid == NID_undef) ? "UNKNOWN" : OBJ_nid2ln(nid);
}
else if (strcEQ(var, "CERT")) {
result = ssl_var_lookup_ssl_cert_data(p, xs, 1);
}
else if (strcEQ(var, "B64CERT")) {
result = ssl_var_lookup_ssl_cert_data(p, xs, 0);
}
return result;
}
/* In this table, .extract is non-zero if RDNs using the NID should be
* extracted to for the SSL_{CLIENT,SERVER}_{I,S}_DN_* environment
* variables. */
static const struct {
const char *name;
int nid;
int extract;
} ssl_var_lookup_ssl_cert_dn_rec[] = {
{ "C", NID_countryName, 1 },
{ "ST", NID_stateOrProvinceName, 1 }, /* officially (RFC2156) */
{ "SP", NID_stateOrProvinceName, 0 }, /* compatibility (SSLeay) */
{ "L", NID_localityName, 1 },
{ "O", NID_organizationName, 1 },
{ "OU", NID_organizationalUnitName, 1 },
{ "CN", NID_commonName, 1 },
{ "T", NID_title, 1 },
{ "I", NID_initials, 1 },
{ "G", NID_givenName, 1 },
{ "S", NID_surname, 1 },
{ "D", NID_description, 1 },
#ifdef NID_userId
{ "UID", NID_userId, 1 },
#endif
{ "Email", NID_pkcs9_emailAddress, 1 },
{ NULL, 0, 0 }
};
static const char *ssl_var_lookup_ssl_cert_dn(apr_pool_t *p, X509_NAME *xsname,
const char *var)
{
const char *ptr;
const char *result;
X509_NAME_ENTRY *xsne;
int i, j, n, idx = 0, raw = 0;
apr_size_t varlen;
ptr = ap_strrchr_c(var, '_');
if (ptr && ptr > var && strcmp(ptr + 1, "RAW") == 0) {
var = apr_pstrmemdup(p, var, ptr - var);
raw = 1;
}
/* if an _N suffix is used, find the Nth attribute of given name */
ptr = ap_strchr_c(var, '_');
if (ptr != NULL && strspn(ptr + 1, "0123456789") == strlen(ptr + 1)) {
idx = atoi(ptr + 1);
varlen = ptr - var;
} else {
varlen = strlen(var);
}
result = NULL;
for (i = 0; ssl_var_lookup_ssl_cert_dn_rec[i].name != NULL; i++) {
if (strEQn(var, ssl_var_lookup_ssl_cert_dn_rec[i].name, varlen)
&& strlen(ssl_var_lookup_ssl_cert_dn_rec[i].name) == varlen) {
for (j = 0; j < X509_NAME_entry_count(xsname); j++) {
xsne = X509_NAME_get_entry(xsname, j);
n =OBJ_obj2nid((ASN1_OBJECT *)X509_NAME_ENTRY_get_object(xsne));
if (n == ssl_var_lookup_ssl_cert_dn_rec[i].nid && idx-- == 0) {
result = modssl_X509_NAME_ENTRY_to_string(p, xsne, raw);
break;
}
}
break;
}
}
return result;
}
static const char *ssl_var_lookup_ssl_cert_san(apr_pool_t *p, X509 *xs, const char *var)
{
int type;
apr_size_t numlen;
const char *onf = NULL;
apr_array_header_t *entries;
if (strcEQn(var, "Email_", 6)) {
type = GEN_EMAIL;
var += 6;
}
else if (strcEQn(var, "DNS_", 4)) {
type = GEN_DNS;
var += 4;
}
else if (strcEQn(var, "OTHER_", 6)) {
type = GEN_OTHERNAME;
var += 6;
if (strEQn(var, "msUPN_", 6)) {
var += 6;
onf = "msUPN";
}
else if (strEQn(var, "dnsSRV_", 7)) {
var += 7;
onf = "id-on-dnsSRV";
}
else
return NULL;
}
else
return NULL;
/* sanity check: number must be between 1 and 4 digits */
numlen = strspn(var, "0123456789");
if ((numlen < 1) || (numlen > 4) || (numlen != strlen(var)))
return NULL;
if (modssl_X509_getSAN(p, xs, type, onf, atoi(var), &entries))
/* return the first entry from this 1-element array */
return APR_ARRAY_IDX(entries, 0, char *);
else
return NULL;
}
static const char *ssl_var_lookup_ssl_cert_valid(apr_pool_t *p, ASN1_TIME *tm)
{
BIO* bio;
if ((bio = BIO_new(BIO_s_mem())) == NULL)
return NULL;
ASN1_TIME_print(bio, tm);
return modssl_bio_free_read(p, bio);
}
#define DIGIT2NUM(x) (((x)[0] - '0') * 10 + (x)[1] - '0')
/* Return a string giving the number of days remaining until 'tm', or
* "0" if this can't be determined. */
static const char *ssl_var_lookup_ssl_cert_remain(apr_pool_t *p, ASN1_TIME *tm)
{
apr_time_t then, now = apr_time_now();
apr_time_exp_t exp = {0};
long diff;
unsigned char *dp;
/* Fail if the time isn't a valid ASN.1 TIME; RFC3280 mandates
* that the seconds digits are present even though ASN.1
* doesn't. */
if ((tm->type == V_ASN1_UTCTIME && tm->length < 11) ||
(tm->type == V_ASN1_GENERALIZEDTIME && tm->length < 13) ||
!ASN1_TIME_check(tm)) {
return "0";
}
if (tm->type == V_ASN1_UTCTIME) {
exp.tm_year = DIGIT2NUM(tm->data);
if (exp.tm_year <= 50) exp.tm_year += 100;
dp = tm->data + 2;
} else {
exp.tm_year = DIGIT2NUM(tm->data) * 100 + DIGIT2NUM(tm->data + 2) - 1900;
dp = tm->data + 4;
}
exp.tm_mon = DIGIT2NUM(dp) - 1;
exp.tm_mday = DIGIT2NUM(dp + 2) + 1;
exp.tm_hour = DIGIT2NUM(dp + 4);
exp.tm_min = DIGIT2NUM(dp + 6);
exp.tm_sec = DIGIT2NUM(dp + 8);
if (apr_time_exp_gmt_get(&then, &exp) != APR_SUCCESS) {
return "0";
}
diff = (long)((apr_time_sec(then) - apr_time_sec(now)) / (60*60*24));
return diff > 0 ? apr_ltoa(p, diff) : "0";
}
static const char *ssl_var_lookup_ssl_cert_serial(apr_pool_t *p, X509 *xs)
{
BIO *bio;
if ((bio = BIO_new(BIO_s_mem())) == NULL)
return NULL;
i2a_ASN1_INTEGER(bio, X509_get_serialNumber(xs));
return modssl_bio_free_read(p, bio);
}
static const char *ssl_var_lookup_ssl_cert_chain(apr_pool_t *p, STACK_OF(X509) *sk,
const char *var, int pem)
{
const char *result;
X509 *xs;
int n;
result = NULL;
if (strspn(var, "0123456789") == strlen(var)) {
n = atoi(var);
if (n < sk_X509_num(sk)) {
xs = sk_X509_value(sk, n);
result = ssl_var_lookup_ssl_cert_data(p, xs, pem);
}
}
return result;
}
static const char *ssl_var_lookup_ssl_cert_rfc4523_cea(apr_pool_t *p, SSL *ssl)
{
char *result;
char *decimal;
X509 *xs;
ASN1_INTEGER *serialNumber;
if (!(xs = SSL_get_peer_certificate(ssl))) {
return NULL;
}
result = NULL;
serialNumber = X509_get_serialNumber(xs);
if (serialNumber) {
X509_NAME *issuer = X509_get_issuer_name(xs);
if (issuer) {
BIGNUM *bn = ASN1_INTEGER_to_BN(serialNumber, NULL);
if((decimal = BN_bn2dec(bn)) == NULL) {
BN_free(bn);
X509_free(xs);
return NULL;
}
result = apr_pstrcat(p, "{ serialNumber ", decimal,
", issuer rdnSequence:\"",
modssl_X509_NAME_to_string(p, issuer, 0), "\" }", NULL);
OPENSSL_free(decimal);
BN_free(bn);
}
}
X509_free(xs);
return result;
}
static const char *ssl_var_lookup_ssl_cert_verify(apr_pool_t *p,
const SSLConnRec *sslconn)
{
char *result;
long vrc;
const char *verr;
const char *vinfo;
SSL *ssl;
X509 *xs;
result = NULL;
ssl = sslconn->ssl;
verr = sslconn->verify_error;
vinfo = sslconn->verify_info;
vrc = SSL_get_verify_result(ssl);
xs = SSL_get_peer_certificate(ssl);
if (vrc == X509_V_OK && verr == NULL && xs == NULL)
/* no client verification done at all */
result = "NONE";
else if (vrc == X509_V_OK && verr == NULL && vinfo == NULL && xs != NULL)
/* client verification done successful */
result = "SUCCESS";
else if (vrc == X509_V_OK && vinfo != NULL && strEQ(vinfo, "GENEROUS"))
/* client verification done in generous way */
result = "GENEROUS";
else
/* client verification failed */
result = apr_psprintf(p, "FAILED:%s",
verr ? verr : X509_verify_cert_error_string(vrc));
if (xs)
X509_free(xs);
return result;
}
static const char *ssl_var_lookup_ssl_cipher(apr_pool_t *p,
const SSLConnRec *sslconn,
const char *var)
{
const char *result;
int usekeysize, algkeysize;
SSL *ssl;
result = NULL;
ssl = sslconn->ssl;
ssl_var_lookup_ssl_cipher_bits(ssl, &usekeysize, &algkeysize);
if (ssl && strEQ(var, "")) {
MODSSL_SSL_CIPHER_CONST SSL_CIPHER *cipher = SSL_get_current_cipher(ssl);
if (cipher) {
result = apr_pstrdup(p, SSL_CIPHER_get_name(cipher));
}
}
else if (strcEQ(var, "_EXPORT"))
result = (usekeysize < 56 ? "true" : "false");
else if (strcEQ(var, "_USEKEYSIZE")) {
result = apr_itoa(p, usekeysize);
}
else if (strcEQ(var, "_ALGKEYSIZE")) {
result = apr_itoa(p, algkeysize);
}
return result;
}
static void ssl_var_lookup_ssl_cipher_bits(SSL *ssl, int *usekeysize, int *algkeysize)
{
MODSSL_SSL_CIPHER_CONST SSL_CIPHER *cipher;
*usekeysize = 0;
*algkeysize = 0;
if (ssl != NULL)
if ((cipher = SSL_get_current_cipher(ssl)) != NULL)
*usekeysize = SSL_CIPHER_get_bits(cipher, algkeysize);
return;
}
static const char *ssl_var_lookup_ssl_handshake_rtt(apr_pool_t *p, SSL *ssl)
{
#if OPENSSL_VERSION_NUMBER >= 0x30200000L
apr_uint64_t rtt;
if (SSL_get_handshake_rtt(ssl, &rtt) > 0)
return apr_psprintf(p, "%" APR_UINT64_T_FMT, rtt);
#endif
return NULL;
}
static const char *ssl_var_lookup_ssl_clienthello(apr_pool_t *p, const SSLConnRec *sslconn, const char *var)
{
#if OPENSSL_VERSION_NUMBER >= 0x10101000L && !defined(LIBRESSL_VERSION_NUMBER)
char *value;
modssl_clienthello_vars *clienthello_vars;
apr_size_t i;
clienthello_vars = sslconn->clienthello_vars;
if (!clienthello_vars)
return NULL;
if (strEQ(var, "VERSION")) {
return apr_psprintf(p, "%04x", (uint16_t) clienthello_vars->version);
}
else if (strEQ(var, "CIPHERS") && (clienthello_vars->ciphers_len > 0)) {
value = apr_palloc(p, clienthello_vars->ciphers_len * 2 + 1);
ap_bin2hex(clienthello_vars->ciphers_data, clienthello_vars->ciphers_len, value);
return value;
}
else if (strEQ(var, "EXTENSIONS") && (clienthello_vars->extids_len > 0)) {
value = apr_palloc(p, clienthello_vars->extids_len * 4 + 1);
for (i = 0; i < clienthello_vars->extids_len; i++) {
apr_snprintf(value + i * 4, 5, "%04x", (uint16_t) clienthello_vars->extids_data[i]);
}
return value;
}
else if (strEQ(var, "GROUPS") && (clienthello_vars->ecgroups_len > 2)) {
value = apr_palloc(p, clienthello_vars->ecgroups_len * 2 + 1 - 2);
ap_bin2hex(clienthello_vars->ecgroups_data + 2, clienthello_vars->ecgroups_len - 2, value);
return value;
}
else if (strEQ(var, "EC_FORMATS") && (clienthello_vars->ecformats_len > 1)) {
value = apr_palloc(p, clienthello_vars->ecformats_len * 2 + 1 - 1);
ap_bin2hex(clienthello_vars->ecformats_data + 1, clienthello_vars->ecformats_len - 1, value);
return value;
}
else if (strEQ(var, "SIG_ALGOS") && (clienthello_vars->sigalgos_len > 2)) {
value = apr_palloc(p, clienthello_vars->sigalgos_len * 2 + 1 - 2);
ap_bin2hex(clienthello_vars->sigalgos_data + 2, clienthello_vars->sigalgos_len - 2, value);
return value;
}
else if (strEQ(var, "ALPN") && (clienthello_vars->alpn_len > 2)) {
value = apr_palloc(p, clienthello_vars->alpn_len * 2 + 1 - 2);
ap_bin2hex(clienthello_vars->alpn_data + 2, clienthello_vars->alpn_len - 2, value);
return value;
}
else if (strEQ(var, "VERSIONS") && (clienthello_vars->versions_len > 1)) {
value = apr_palloc(p, clienthello_vars->versions_len * 2 + 1 - 1);
ap_bin2hex(clienthello_vars->versions_data + 1, clienthello_vars->versions_len - 1, value);
return value;
}
#endif
return NULL;
}
static const char *ssl_var_lookup_ssl_version(const char *var)
{
if (strEQ(var, "INTERFACE")) {
return var_interface;
}
else if (strEQ(var, "LIBRARY_INTERFACE")) {
return var_library_interface;
}
else if (strEQ(var, "LIBRARY")) {
return var_library;
}
return NULL;
}
/* Add each RDN in 'xn' to the table 't' where the NID is present in
* 'nids', using key prefix 'pfx'. */
static void extract_dn(apr_table_t *t, apr_hash_t *nids, const char *pfx,
X509_NAME *xn, apr_pool_t *p)
{
X509_NAME_ENTRY *xsne;
apr_hash_t *count;
int i, nid;
/* Hash of (int) NID -> (int *) counter to count each time an RDN
* with the given NID has been seen. */
count = apr_hash_make(p);
/* For each RDN... */
for (i = 0; i < X509_NAME_entry_count(xn); i++) {
const char *tag;
xsne = X509_NAME_get_entry(xn, i);
/* Retrieve the nid, and check whether this is one of the nids
* which are to be extracted. */
nid = OBJ_obj2nid((ASN1_OBJECT *)X509_NAME_ENTRY_get_object(xsne));
tag = apr_hash_get(nids, &nid, sizeof nid);
if (tag) {
const char *key;
int *dup;
char *value;
/* Check whether a variable with this nid was already
* been used; if so, use the foo_N=bar syntax. */
dup = apr_hash_get(count, &nid, sizeof nid);
if (dup) {
key = apr_psprintf(p, "%s%s_%d", pfx, tag, ++(*dup));
}
else {
/* Otherwise, use the plain foo=bar syntax. */
dup = apr_pcalloc(p, sizeof *dup);
apr_hash_set(count, &nid, sizeof nid, dup);
key = apr_pstrcat(p, pfx, tag, NULL);
}
value = modssl_X509_NAME_ENTRY_to_string(p, xsne, 0);
apr_table_setn(t, key, value);
}
}
}
void modssl_var_extract_dns(apr_table_t *t, SSL *ssl, apr_pool_t *p)
{
apr_hash_t *nids;
unsigned n;
X509 *xs;
/* Build up a hash table of (int *)NID->(char *)short-name for all
* the tags which are to be extracted: */
nids = apr_hash_make(p);
for (n = 0; ssl_var_lookup_ssl_cert_dn_rec[n].name; n++) {
if (ssl_var_lookup_ssl_cert_dn_rec[n].extract) {
apr_hash_set(nids, &ssl_var_lookup_ssl_cert_dn_rec[n].nid,
sizeof(ssl_var_lookup_ssl_cert_dn_rec[0].nid),
ssl_var_lookup_ssl_cert_dn_rec[n].name);
}
}
/* Extract the server cert DNS -- note that the refcount does NOT
* increase: */
xs = SSL_get_certificate(ssl);
if (xs) {
extract_dn(t, nids, "SSL_SERVER_S_DN_", X509_get_subject_name(xs), p);
extract_dn(t, nids, "SSL_SERVER_I_DN_", X509_get_issuer_name(xs), p);
}
/* Extract the client cert DNs -- note that the refcount DOES
* increase: */
xs = SSL_get_peer_certificate(ssl);
if (xs) {
extract_dn(t, nids, "SSL_CLIENT_S_DN_", X509_get_subject_name(xs), p);
extract_dn(t, nids, "SSL_CLIENT_I_DN_", X509_get_issuer_name(xs), p);
X509_free(xs);
}
}
static void extract_san_array(apr_table_t *t, const char *pfx,
apr_array_header_t *entries, apr_pool_t *p)
{
int i;
for (i = 0; i < entries->nelts; i++) {
const char *key = apr_psprintf(p, "%s_%d", pfx, i);
apr_table_setn(t, key, APR_ARRAY_IDX(entries, i, const char *));
}
}
void modssl_var_extract_san_entries(apr_table_t *t, SSL *ssl, apr_pool_t *p)
{
X509 *xs;
apr_array_header_t *entries;
/* subjectAltName entries of the server certificate */
xs = SSL_get_certificate(ssl);
if (xs) {
if (modssl_X509_getSAN(p, xs, GEN_EMAIL, NULL, -1, &entries)) {
extract_san_array(t, "SSL_SERVER_SAN_Email", entries, p);
}
if (modssl_X509_getSAN(p, xs, GEN_DNS, NULL, -1, &entries)) {
extract_san_array(t, "SSL_SERVER_SAN_DNS", entries, p);
}
if (modssl_X509_getSAN(p, xs, GEN_OTHERNAME, "id-on-dnsSRV", -1,
&entries)) {
extract_san_array(t, "SSL_SERVER_SAN_OTHER_dnsSRV", entries, p);
}
/* no need to free xs (refcount does not increase) */
}
/* subjectAltName entries of the client certificate */
xs = SSL_get_peer_certificate(ssl);
if (xs) {
if (modssl_X509_getSAN(p, xs, GEN_EMAIL, NULL, -1, &entries)) {
extract_san_array(t, "SSL_CLIENT_SAN_Email", entries, p);
}
if (modssl_X509_getSAN(p, xs, GEN_DNS, NULL, -1, &entries)) {
extract_san_array(t, "SSL_CLIENT_SAN_DNS", entries, p);
}
if (modssl_X509_getSAN(p, xs, GEN_OTHERNAME, "msUPN", -1, &entries)) {
extract_san_array(t, "SSL_CLIENT_SAN_OTHER_msUPN", entries, p);
}
X509_free(xs);
}
}
/* For an extension type which OpenSSL does not recognize, attempt to
* parse the extension type as a primitive string. This will fail for
* any structured extension type per the docs. Returns non-zero on
* success and writes the string to the given bio. */
static int dump_extn_value(BIO *bio, ASN1_OCTET_STRING *str)
{
const unsigned char *pp = str->data;
ASN1_STRING *ret = ASN1_STRING_new();
int rv = 0;
if(!ret) {
return rv;
}
/* This allows UTF8String, IA5String, VisibleString, or BMPString;
* conversion to UTF-8 is forced. */
if (d2i_DISPLAYTEXT(&ret, &pp, str->length)) {
ASN1_STRING_print_ex(bio, ret, ASN1_STRFLGS_UTF8_CONVERT);
rv = 1;
}
ASN1_STRING_free(ret);
return rv;
}
apr_array_header_t *ssl_ext_list(apr_pool_t *p, conn_rec *c, int peer,
const char *extension)
{
const SSLConnRec *sslconn = ssl_get_effective_config(c);
SSL *ssl = NULL;
apr_array_header_t *array = NULL;
X509 *xs = NULL;
ASN1_OBJECT *oid = NULL;
int count = 0, j;
if (!sslconn || !sslconn->ssl || !extension) {
return NULL;
}
ssl = sslconn->ssl;
/* We accept the "extension" string to be converted as
* a long name (nsComment), short name (DN) or
* numeric OID (1.2.3.4).
*/
oid = OBJ_txt2obj(extension, 0);
if (!oid) {
ap_log_cerror(APLOG_MARK, APLOG_DEBUG, 0, c, APLOGNO(01970)
"could not parse OID '%s'", extension);
ERR_clear_error();
return NULL;
}
xs = peer ? SSL_get_peer_certificate(ssl) : SSL_get_certificate(ssl);
if (xs == NULL) {
return NULL;
}
count = X509_get_ext_count(xs);
/* Create an array large enough to accommodate every extension. This is
* likely overkill, but safe.
*/
array = apr_array_make(p, count, sizeof(char *));
for (j = 0; j < count; j++) {
X509_EXTENSION *ext = X509_get_ext(xs, j);
if (OBJ_cmp(X509_EXTENSION_get_object(ext), oid) == 0) {
BIO *bio = BIO_new(BIO_s_mem());
if(bio == NULL) {
X509_free(xs);
ASN1_OBJECT_free(oid);
return NULL;
}
/* We want to obtain a string representation of the extensions
* value and add it to the array we're building.
* X509V3_EXT_print() doesn't know about all the possible
* data types, but the value is stored as an ASN1_OCTET_STRING
* allowing us a fallback in case of X509V3_EXT_print
* not knowing how to handle the data.
*/
if (X509V3_EXT_print(bio, ext, 0, 0) == 1 ||
dump_extn_value(bio, X509_EXTENSION_get_data(ext)) == 1) {
BUF_MEM *buf;
char **ptr = apr_array_push(array);
BIO_get_mem_ptr(bio, &buf);
*ptr = apr_pstrmemdup(p, buf->data, buf->length);
} else {
ap_log_cerror(APLOG_MARK, APLOG_DEBUG, 0, c, APLOGNO(01971)
"Found an extension '%s', but failed to "
"create a string from it", extension);
}
BIO_vfree(bio);
}
}
if (array->nelts == 0)
array = NULL;
if (peer) {
/* only SSL_get_peer_certificate raises the refcount */
X509_free(xs);
}
ASN1_OBJECT_free(oid);
ERR_clear_error();
return array;
}
static const char *ssl_var_lookup_ssl_compress_meth(SSL *ssl)
{
const char *result = "NULL";
#ifndef OPENSSL_NO_COMP
SSL_SESSION *pSession = SSL_get_session(ssl);
if (pSession) {
#ifdef OPENSSL_NO_SSL_INTERN
switch (SSL_SESSION_get_compress_id(pSession)) {
#else
switch (pSession->compress_meth) {
#endif
case 0:
/* default "NULL" already set */
break;
/* Defined by RFC 3749, deflate is coded by "1" */
case 1:
result = "DEFLATE";
break;
/* IANA assigned compression number for LZS */
case 0x40:
result = "LZS";
break;
default:
result = "UNKNOWN";
break;
}
}
#endif
return result;
}
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