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Posted to cvs@httpd.apache.org by ji...@apache.org on 2013/05/23 14:52:04 UTC
svn commit: r1485667 - in /httpd/httpd/branches/2.4.x: ./ docs/manual/
docs/manual/mod/ modules/ssl/
Author: jim
Date: Thu May 23 12:52:04 2013
New Revision: 1485667
URL: http://svn.apache.org/r1485667
Log:
Merge r1425874, r1426850 from trunk:
mod_ssl: add support for subjectAltName-based host name checking in proxy mode
(PR 54030)
factor out code from ssl_engine_init.c:ssl_check_public_cert()
to ssl_util_ssl.c:SSL_X509_match_name()
introduce new SSLProxyCheckPeerName directive, which should eventually
obsolete SSLProxyCheckPeerCN
ssl_engine_io.c:ssl_io_filter_handshake(): avoid code duplication
when aborting with HTTP_BAD_GATEWAY
Fix warning about discarding 'const' qualifier from pointer
Submitted by: kbrand, sf
Reviewed/backported by: jim
Modified:
httpd/httpd/branches/2.4.x/ (props changed)
httpd/httpd/branches/2.4.x/CHANGES
httpd/httpd/branches/2.4.x/STATUS
httpd/httpd/branches/2.4.x/docs/manual/ (props changed)
httpd/httpd/branches/2.4.x/docs/manual/mod/ (props changed)
httpd/httpd/branches/2.4.x/docs/manual/mod/mod_ssl.xml
httpd/httpd/branches/2.4.x/modules/ssl/mod_ssl.c
httpd/httpd/branches/2.4.x/modules/ssl/ssl_engine_config.c
httpd/httpd/branches/2.4.x/modules/ssl/ssl_engine_init.c
httpd/httpd/branches/2.4.x/modules/ssl/ssl_engine_io.c
httpd/httpd/branches/2.4.x/modules/ssl/ssl_private.h
httpd/httpd/branches/2.4.x/modules/ssl/ssl_util_ssl.c
httpd/httpd/branches/2.4.x/modules/ssl/ssl_util_ssl.h
Propchange: httpd/httpd/branches/2.4.x/
------------------------------------------------------------------------------
Merged /httpd/httpd/trunk:r1425874,1426850
Modified: httpd/httpd/branches/2.4.x/CHANGES
URL: http://svn.apache.org/viewvc/httpd/httpd/branches/2.4.x/CHANGES?rev=1485667&r1=1485666&r2=1485667&view=diff
==============================================================================
--- httpd/httpd/branches/2.4.x/CHANGES [utf-8] (original)
+++ httpd/httpd/branches/2.4.x/CHANGES [utf-8] Thu May 23 12:52:04 2013
@@ -2,6 +2,9 @@
Changes with Apache 2.4.5
+ *) mod_ssl: add support for subjectAltName-based host name checking
+ in proxy mode. PR 54030. [Kaspar Brand]
+
*) core: Use the proper macro for HTTP/1.1. [Graham Leggett]
*) event MPM: Provide error handling for ThreadStackSize. PR 54311
Modified: httpd/httpd/branches/2.4.x/STATUS
URL: http://svn.apache.org/viewvc/httpd/httpd/branches/2.4.x/STATUS?rev=1485667&r1=1485666&r2=1485667&view=diff
==============================================================================
--- httpd/httpd/branches/2.4.x/STATUS (original)
+++ httpd/httpd/branches/2.4.x/STATUS Thu May 23 12:52:04 2013
@@ -90,13 +90,6 @@ RELEASE SHOWSTOPPERS:
PATCHES ACCEPTED TO BACKPORT FROM TRUNK:
[ start all new proposals below, under PATCHES PROPOSED. ]
- * mod_ssl: add support for subjectAltName-based host name checking
- in proxy mode (PR 54030)
- trunk patch: https://svn.apache.org/viewvc?view=revision&revision=r1425874
- https://svn.apache.org/viewvc?view=revision&revision=r1426850
- 2.4.x patch: trunk patch works (modulo CHANGES and next-number)
- +1: kbrand, minfrin, jim
-
* mod_cache: RFC2616 14.9.3 The s-maxage directive also implies the
semantics of the proxy-revalidate directive.
trunk patch: http://svn.apache.org/r1479216
Propchange: httpd/httpd/branches/2.4.x/docs/manual/
------------------------------------------------------------------------------
Merged /httpd/httpd/trunk/docs/manual:r1425874
Propchange: httpd/httpd/branches/2.4.x/docs/manual/mod/
------------------------------------------------------------------------------
Merged /httpd/httpd/trunk/docs/manual/mod:r1425874
Modified: httpd/httpd/branches/2.4.x/docs/manual/mod/mod_ssl.xml
URL: http://svn.apache.org/viewvc/httpd/httpd/branches/2.4.x/docs/manual/mod/mod_ssl.xml?rev=1485667&r1=1485666&r2=1485667&view=diff
==============================================================================
--- httpd/httpd/branches/2.4.x/docs/manual/mod/mod_ssl.xml (original)
+++ httpd/httpd/branches/2.4.x/docs/manual/mod/mod_ssl.xml Thu May 23 12:52:04 2013
@@ -1756,7 +1756,7 @@ SSLProxyCheckPeerExpire on
<directivesynopsis>
<name>SSLProxyCheckPeerCN</name>
-<description>Whether to check the remote server certificates CN field
+<description>Whether to check the remote server certificate's CN field
</description>
<syntax>SSLProxyCheckPeerCN on|off</syntax>
<default>SSLProxyCheckPeerCN on</default>
@@ -1765,10 +1765,16 @@ SSLProxyCheckPeerExpire on
<usage>
<p>
-This directive sets whether the remote server certificates CN field is
+This directive sets whether the remote server certificate's CN field is
compared against the hostname of the request URL. If both are not equal
a 502 status code (Bad Gateway) is sent.
</p>
+<p>
+SSLProxyCheckPeerCN has been superseded by
+<directive module="mod_ssl">SSLProxyCheckPeerName</directive>, and its
+setting is only taken into account when
+<code>SSLProxyCheckPeerName off</code> is specified at the same time.
+</p>
<example><title>Example</title>
<highlight language="config">
SSLProxyCheckPeerCN on
@@ -1778,6 +1784,36 @@ SSLProxyCheckPeerCN on
</directivesynopsis>
<directivesynopsis>
+<name>SSLProxyCheckPeerName</name>
+<description>Configure host name checking for remote server certificates
+</description>
+<syntax>SSLProxyCheckPeerName on|off</syntax>
+<default>SSLProxyCheckPeerName on</default>
+<contextlist><context>server config</context>
+<context>virtual host</context></contextlist>
+
+<usage>
+<p>
+This directive configures host name checking for server certificates
+when mod_ssl is acting as an SSL client. The check will
+succeed if the host name from the request URI is found in
+either the subjectAltName extension or (one of) the CN attribute(s)
+in the certificate's subject. If the check fails, the SSL request
+is aborted and a 502 status code (Bad Gateway) is returned.
+The directive supersedes <directive module="mod_ssl">SSLProxyCheckPeerCN</directive>,
+which only checks for the expected host name in the first CN attribute.
+</p>
+<p>
+Wildcard matching is supported in one specific flavor: subjectAltName entries
+of type dNSName or CN attributes starting with <code>*.</code> will match
+for any DNS name with the same number of labels and the same suffix
+(i.e., <code>*.example.org</code> matches for <code>foo.example.org</code>,
+but not for <code>foo.bar.example.org</code>).
+</p>
+</usage>
+</directivesynopsis>
+
+<directivesynopsis>
<name>SSLProxyEngine</name>
<description>SSL Proxy Engine Operation Switch</description>
<syntax>SSLProxyEngine on|off</syntax>
Modified: httpd/httpd/branches/2.4.x/modules/ssl/mod_ssl.c
URL: http://svn.apache.org/viewvc/httpd/httpd/branches/2.4.x/modules/ssl/mod_ssl.c?rev=1485667&r1=1485666&r2=1485667&view=diff
==============================================================================
--- httpd/httpd/branches/2.4.x/modules/ssl/mod_ssl.c (original)
+++ httpd/httpd/branches/2.4.x/modules/ssl/mod_ssl.c Thu May 23 12:52:04 2013
@@ -200,9 +200,12 @@ static const command_rec ssl_config_cmds
"of the client certificate "
"(`/path/to/file' - PEM encoded certificates)")
SSL_CMD_SRV(ProxyCheckPeerExpire, FLAG,
- "SSL Proxy: check the peers certificate expiration date")
+ "SSL Proxy: check the peer certificate's expiration date")
SSL_CMD_SRV(ProxyCheckPeerCN, FLAG,
- "SSL Proxy: check the peers certificate CN")
+ "SSL Proxy: check the peer certificate's CN")
+ SSL_CMD_SRV(ProxyCheckPeerName, FLAG,
+ "SSL Proxy: check the peer certificate's name "
+ "(must be present in subjectAltName extension or CN")
/*
* Per-directory context configuration directives
Modified: httpd/httpd/branches/2.4.x/modules/ssl/ssl_engine_config.c
URL: http://svn.apache.org/viewvc/httpd/httpd/branches/2.4.x/modules/ssl/ssl_engine_config.c?rev=1485667&r1=1485666&r2=1485667&view=diff
==============================================================================
--- httpd/httpd/branches/2.4.x/modules/ssl/ssl_engine_config.c (original)
+++ httpd/httpd/branches/2.4.x/modules/ssl/ssl_engine_config.c Thu May 23 12:52:04 2013
@@ -207,6 +207,7 @@ static SSLSrvConfigRec *ssl_config_serve
sc->insecure_reneg = UNSET;
sc->proxy_ssl_check_peer_expire = SSL_ENABLED_UNSET;
sc->proxy_ssl_check_peer_cn = SSL_ENABLED_UNSET;
+ sc->proxy_ssl_check_peer_name = SSL_ENABLED_UNSET;
#ifndef OPENSSL_NO_TLSEXT
sc->strict_sni_vhost_check = SSL_ENABLED_UNSET;
#endif
@@ -336,6 +337,7 @@ void *ssl_config_server_merge(apr_pool_t
cfgMergeBool(insecure_reneg);
cfgMerge(proxy_ssl_check_peer_expire, SSL_ENABLED_UNSET);
cfgMerge(proxy_ssl_check_peer_cn, SSL_ENABLED_UNSET);
+ cfgMerge(proxy_ssl_check_peer_name, SSL_ENABLED_UNSET);
#ifndef OPENSSL_NO_TLSEXT
cfgMerge(strict_sni_vhost_check, SSL_ENABLED_UNSET);
#endif
@@ -1632,6 +1634,15 @@ const char *ssl_cmd_SSLProxyCheckPeerCN(
return NULL;
}
+const char *ssl_cmd_SSLProxyCheckPeerName(cmd_parms *cmd, void *dcfg, int flag)
+{
+ SSLSrvConfigRec *sc = mySrvConfig(cmd->server);
+
+ sc->proxy_ssl_check_peer_name = flag ? SSL_ENABLED_TRUE : SSL_ENABLED_FALSE;
+
+ return NULL;
+}
+
const char *ssl_cmd_SSLStrictSNIVHostCheck(cmd_parms *cmd, void *dcfg, int flag)
{
#ifndef OPENSSL_NO_TLSEXT
Modified: httpd/httpd/branches/2.4.x/modules/ssl/ssl_engine_init.c
URL: http://svn.apache.org/viewvc/httpd/httpd/branches/2.4.x/modules/ssl/ssl_engine_init.c?rev=1485667&r1=1485666&r2=1485667&view=diff
==============================================================================
--- httpd/httpd/branches/2.4.x/modules/ssl/ssl_engine_init.c (original)
+++ httpd/httpd/branches/2.4.x/modules/ssl/ssl_engine_init.c Thu May 23 12:52:04 2013
@@ -1110,7 +1110,6 @@ static void ssl_check_public_cert(server
int type)
{
int is_ca, pathlen;
- apr_array_header_t *ids;
if (!cert) {
return;
@@ -1143,56 +1142,12 @@ static void ssl_check_public_cert(server
}
}
- /*
- * Check if the server name is covered by the certificate.
- * Consider both dNSName entries in the subjectAltName extension
- * and, as a fallback, commonName attributes in the subject DN.
- * (DNS-IDs and CN-IDs as defined in RFC 6125).
- */
- if (SSL_X509_getIDs(ptemp, cert, &ids)) {
- char *cp;
- int i;
- char **id = (char **)ids->elts;
- BOOL is_wildcard, matched = FALSE;
-
- for (i = 0; i < ids->nelts; i++) {
- if (!id[i])
- continue;
-
- /*
- * Determine if it is a wildcard ID - we're restrictive
- * in the sense that we require the wildcard character to be
- * THE left-most label (i.e., the ID must start with "*.")
- */
- is_wildcard = (*id[i] == '*' && *(id[i]+1) == '.') ? TRUE : FALSE;
-
- /*
- * If the ID includes a wildcard character, check if it matches
- * for the left-most DNS label (i.e., the wildcard character
- * is not allowed to match a dot). Otherwise, try a simple
- * string compare, case insensitively.
- */
- if ((is_wildcard == TRUE &&
- (cp = strchr(s->server_hostname, '.')) &&
- !strcasecmp(id[i]+1, cp)) ||
- !strcasecmp(id[i], s->server_hostname)) {
- matched = TRUE;
- ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, s, APLOGNO(01908)
- "%sID '%s' in %s certificate configured "
- "for %s matches server name",
- is_wildcard ? "Wildcard " : "",
- id[i], ssl_asn1_keystr(type),
- (mySrvConfig(s))->vhost_id);
- break;
- }
- }
-
- if (matched == FALSE) {
- ap_log_error(APLOG_MARK, APLOG_WARNING, 0, s, APLOGNO(01909)
- "%s certificate configured for %s does NOT include "
- "an ID which matches the server name",
- ssl_asn1_keystr(type), (mySrvConfig(s))->vhost_id);
- }
+ if (SSL_X509_match_name(ptemp, cert, (const char *)s->server_hostname,
+ TRUE, s) == FALSE) {
+ ap_log_error(APLOG_MARK, APLOG_WARNING, 0, s, APLOGNO(01909)
+ "%s certificate configured for %s does NOT include "
+ "an ID which matches the server name",
+ ssl_asn1_keystr(type), (mySrvConfig(s))->vhost_id);
}
}
Modified: httpd/httpd/branches/2.4.x/modules/ssl/ssl_engine_io.c
URL: http://svn.apache.org/viewvc/httpd/httpd/branches/2.4.x/modules/ssl/ssl_engine_io.c?rev=1485667&r1=1485666&r2=1485667&view=diff
==============================================================================
--- httpd/httpd/branches/2.4.x/modules/ssl/ssl_engine_io.c (original)
+++ httpd/httpd/branches/2.4.x/modules/ssl/ssl_engine_io.c Thu May 23 12:52:04 2013
@@ -1053,6 +1053,7 @@ static apr_status_t ssl_io_filter_handsh
#endif
const char *hostname_note = apr_table_get(c->notes,
"proxy-request-hostname");
+ BOOL proxy_ssl_check_peer_ok = TRUE;
sc = mySrvConfig(server);
#ifndef OPENSSL_NO_TLSEXT
@@ -1090,26 +1091,32 @@ static apr_status_t ssl_io_filter_handsh
return MODSSL_ERROR_BAD_GATEWAY;
}
+ cert = SSL_get_peer_certificate(filter_ctx->pssl);
+
if (sc->proxy_ssl_check_peer_expire != SSL_ENABLED_FALSE) {
- cert = SSL_get_peer_certificate(filter_ctx->pssl);
if (!cert
|| (X509_cmp_current_time(
X509_get_notBefore(cert)) >= 0)
|| (X509_cmp_current_time(
X509_get_notAfter(cert)) <= 0)) {
+ proxy_ssl_check_peer_ok = FALSE;
ap_log_cerror(APLOG_MARK, APLOG_INFO, 0, c, APLOGNO(02004)
"SSL Proxy: Peer certificate is expired");
- if (cert) {
- X509_free(cert);
- }
- /* ensure that the SSL structures etc are freed, etc: */
- ssl_filter_io_shutdown(filter_ctx, c, 1);
- apr_table_setn(c->notes, "SSL_connect_rv", "err");
- return HTTP_BAD_GATEWAY;
}
- X509_free(cert);
}
- if ((sc->proxy_ssl_check_peer_cn != SSL_ENABLED_FALSE) &&
+ if ((sc->proxy_ssl_check_peer_name != SSL_ENABLED_FALSE) &&
+ hostname_note) {
+ apr_table_unset(c->notes, "proxy-request-hostname");
+ if (!cert
+ || SSL_X509_match_name(c->pool, cert, hostname_note,
+ TRUE, server) == FALSE) {
+ proxy_ssl_check_peer_ok = FALSE;
+ ap_log_cerror(APLOG_MARK, APLOG_INFO, 0, c, APLOGNO(02411)
+ "SSL Proxy: Peer certificate does not match "
+ "for hostname %s", hostname_note);
+ }
+ }
+ else if ((sc->proxy_ssl_check_peer_cn != SSL_ENABLED_FALSE) &&
hostname_note) {
const char *hostname;
int match = 0;
@@ -1128,17 +1135,25 @@ static apr_status_t ssl_io_filter_handsh
}
if (!match) {
+ proxy_ssl_check_peer_ok = FALSE;
ap_log_cerror(APLOG_MARK, APLOG_INFO, 0, c, APLOGNO(02005)
"SSL Proxy: Peer certificate CN mismatch:"
" Certificate CN: %s Requested hostname: %s",
hostname, hostname_note);
- /* ensure that the SSL structures etc are freed, etc: */
- ssl_filter_io_shutdown(filter_ctx, c, 1);
- apr_table_setn(c->notes, "SSL_connect_rv", "err");
- return HTTP_BAD_GATEWAY;
}
}
+ if (cert) {
+ X509_free(cert);
+ }
+
+ if (proxy_ssl_check_peer_ok != TRUE) {
+ /* ensure that the SSL structures etc are freed, etc: */
+ ssl_filter_io_shutdown(filter_ctx, c, 1);
+ apr_table_setn(c->notes, "SSL_connect_rv", "err");
+ return HTTP_BAD_GATEWAY;
+ }
+
apr_table_setn(c->notes, "SSL_connect_rv", "ok");
return APR_SUCCESS;
}
Modified: httpd/httpd/branches/2.4.x/modules/ssl/ssl_private.h
URL: http://svn.apache.org/viewvc/httpd/httpd/branches/2.4.x/modules/ssl/ssl_private.h?rev=1485667&r1=1485666&r2=1485667&view=diff
==============================================================================
--- httpd/httpd/branches/2.4.x/modules/ssl/ssl_private.h (original)
+++ httpd/httpd/branches/2.4.x/modules/ssl/ssl_private.h Thu May 23 12:52:04 2013
@@ -687,6 +687,7 @@ struct SSLSrvConfigRec {
modssl_ctx_t *proxy;
ssl_enabled_t proxy_ssl_check_peer_expire;
ssl_enabled_t proxy_ssl_check_peer_cn;
+ ssl_enabled_t proxy_ssl_check_peer_name;
#ifndef OPENSSL_NO_TLSEXT
ssl_enabled_t strict_sni_vhost_check;
#endif
@@ -782,6 +783,7 @@ const char *ssl_cmd_SSLSessionTicketKeyF
#endif
const char *ssl_cmd_SSLProxyCheckPeerExpire(cmd_parms *cmd, void *dcfg, int flag);
const char *ssl_cmd_SSLProxyCheckPeerCN(cmd_parms *cmd, void *dcfg, int flag);
+const char *ssl_cmd_SSLProxyCheckPeerName(cmd_parms *cmd, void *dcfg, int flag);
const char *ssl_cmd_SSLOCSPOverrideResponder(cmd_parms *cmd, void *dcfg, int flag);
const char *ssl_cmd_SSLOCSPDefaultResponder(cmd_parms *cmd, void *dcfg, const char *arg);
Modified: httpd/httpd/branches/2.4.x/modules/ssl/ssl_util_ssl.c
URL: http://svn.apache.org/viewvc/httpd/httpd/branches/2.4.x/modules/ssl/ssl_util_ssl.c?rev=1485667&r1=1485666&r2=1485667&view=diff
==============================================================================
--- httpd/httpd/branches/2.4.x/modules/ssl/ssl_util_ssl.c (original)
+++ httpd/httpd/branches/2.4.x/modules/ssl/ssl_util_ssl.c Thu May 23 12:52:04 2013
@@ -338,6 +338,82 @@ BOOL SSL_X509_getIDs(apr_pool_t *p, X509
return apr_is_empty_array(*ids) ? FALSE : TRUE;
}
+/*
+ * Check if a certificate matches for a particular name, by iterating over its
+ * DNS-IDs and CN-IDs (RFC 6125), optionally with basic wildcard matching.
+ * If server_rec is non-NULL, some (debug/trace) logging is enabled.
+ */
+BOOL SSL_X509_match_name(apr_pool_t *p, X509 *x509, const char *name,
+ BOOL allow_wildcard, server_rec *s)
+{
+ BOOL matched = FALSE;
+ apr_array_header_t *ids;
+
+ /*
+ * At some day in the future, this might be replaced with X509_check_host()
+ * (available in OpenSSL 1.0.2 and later), but two points should be noted:
+ * 1) wildcard matching in X509_check_host() might yield different
+ * results (by default, it supports a broader set of patterns, e.g.
+ * wildcards in non-initial positions);
+ * 2) we lose the option of logging each DNS- and CN-ID (until a match
+ * is found).
+ */
+
+ if (SSL_X509_getIDs(p, x509, &ids)) {
+ const char *cp;
+ int i;
+ char **id = (char **)ids->elts;
+ BOOL is_wildcard;
+
+ for (i = 0; i < ids->nelts; i++) {
+ if (!id[i])
+ continue;
+
+ /*
+ * Determine if it is a wildcard ID - we're restrictive
+ * in the sense that we require the wildcard character to be
+ * THE left-most label (i.e., the ID must start with "*.")
+ */
+ is_wildcard = (*id[i] == '*' && *(id[i]+1) == '.') ? TRUE : FALSE;
+
+ /*
+ * If the ID includes a wildcard character (and the caller is
+ * allowing wildcards), check if it matches for the left-most
+ * DNS label - i.e., the wildcard character is not allowed
+ * to match a dot. Otherwise, try a simple string compare.
+ */
+ if ((allow_wildcard == TRUE && is_wildcard == TRUE &&
+ (cp = ap_strchr_c(name, '.')) && !strcasecmp(id[i]+1, cp)) ||
+ !strcasecmp(id[i], name)) {
+ matched = TRUE;
+ }
+
+ if (s) {
+ ap_log_error(APLOG_MARK, APLOG_TRACE3, 0, s,
+ "[%s] SSL_X509_match_name: expecting name '%s', "
+ "%smatched by ID '%s'",
+ (mySrvConfig(s))->vhost_id, name,
+ matched == TRUE ? "" : "NOT ", id[i]);
+ }
+
+ if (matched == TRUE) {
+ break;
+ }
+ }
+
+ }
+
+ if (s) {
+ ssl_log_xerror(SSLLOG_MARK, APLOG_DEBUG, 0, p, s, x509,
+ APLOGNO(02412) "[%s] Cert %s for name '%s'",
+ (mySrvConfig(s))->vhost_id,
+ matched == TRUE ? "matches" : "does not match",
+ name);
+ }
+
+ return matched;
+}
+
/* _________________________________________________________________
**
** Low-Level CA Certificate Loading
Modified: httpd/httpd/branches/2.4.x/modules/ssl/ssl_util_ssl.h
URL: http://svn.apache.org/viewvc/httpd/httpd/branches/2.4.x/modules/ssl/ssl_util_ssl.h?rev=1485667&r1=1485666&r2=1485667&view=diff
==============================================================================
--- httpd/httpd/branches/2.4.x/modules/ssl/ssl_util_ssl.h (original)
+++ httpd/httpd/branches/2.4.x/modules/ssl/ssl_util_ssl.h Thu May 23 12:52:04 2013
@@ -68,6 +68,7 @@ BOOL SSL_X509_getBC(X509 *, int *
char *SSL_X509_NAME_ENTRY_to_string(apr_pool_t *p, X509_NAME_ENTRY *xsne);
char *SSL_X509_NAME_to_string(apr_pool_t *, X509_NAME *, int);
BOOL SSL_X509_getIDs(apr_pool_t *, X509 *, apr_array_header_t **);
+BOOL SSL_X509_match_name(apr_pool_t *, X509 *, const char *, BOOL, server_rec *);
BOOL SSL_X509_INFO_load_file(apr_pool_t *, STACK_OF(X509_INFO) *, const char *);
BOOL SSL_X509_INFO_load_path(apr_pool_t *, STACK_OF(X509_INFO) *, const char *);
int SSL_CTX_use_certificate_chain(SSL_CTX *, char *, int, pem_password_cb *);