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NOTE: The patch has been adjusted to match the base code before backporting.
From 16f8b0902c28b1eaab93ddf120ce40b89bcda8d1 Mon Sep 17 00:00:00 2001
From: Howard Chu <hyc@openldap.org>
Date: Tue, 10 Sep 2013 04:26:51 -0700
Subject: [PATCH] ITS#7398 add LDAP_OPT_X_TLS_PEERCERT
retrieve peer cert for an active TLS session
---
doc/man/man3/ldap_get_option.3 | 8 ++++++++
include/ldap.h | 1 +
libraries/libldap/ldap-tls.h | 2 ++
libraries/libldap/tls2.c | 23 +++++++++++++++++++++++
libraries/libldap/tls_g.c | 19 +++++++++++++++++++
libraries/libldap/tls_m.c | 17 +++++++++++++++++
libraries/libldap/tls_o.c | 16 ++++++++++++++++
7 files changed, 86 insertions(+)
diff --git a/doc/man/man3/ldap_get_option.3 b/doc/man/man3/ldap_get_option.3
index e67de75e9..1bb55d357 100644
--- a/doc/man/man3/ldap_get_option.3
+++ b/doc/man/man3/ldap_get_option.3
@@ -732,6 +732,14 @@ A non-zero value pointed to by
.BR invalue
tells the library to create a context for a server.
.TP
+.B LDAP_OPT_X_TLS_PEERCERT
+Gets the peer's certificate in DER format from an established TLS session.
+.BR outvalue
+must be
+.BR "struct berval *" ,
+and the data it returns needs to be freed by the caller using
+.BR ldap_memfree (3).
+.TP
.B LDAP_OPT_X_TLS_PROTOCOL_MIN
Sets/gets the minimum protocol version.
.BR invalue
diff --git a/include/ldap.h b/include/ldap.h
index 4de3f7f32..97ca524d7 100644
--- a/include/ldap.h
+++ b/include/ldap.h
@@ -161,6 +161,7 @@ LDAP_BEGIN_DECL
#define LDAP_OPT_X_TLS_CRLFILE 0x6010 /* GNUtls only */
#define LDAP_OPT_X_TLS_PACKAGE 0x6011
#define LDAP_OPT_X_TLS_ECNAME 0x6012
+#define LDAP_OPT_X_TLS_PEERCERT 0x6015 /* read-only */
#define LDAP_OPT_X_TLS_NEVER 0
#define LDAP_OPT_X_TLS_HARD 1
diff --git a/libraries/libldap/ldap-tls.h b/libraries/libldap/ldap-tls.h
index 548814d7f..890d20dc7 100644
--- a/libraries/libldap/ldap-tls.h
+++ b/libraries/libldap/ldap-tls.h
@@ -43,6 +43,7 @@ typedef int (TI_session_dn)(tls_session *sess, struct berval *dn);
typedef int (TI_session_chkhost)(LDAP *ld, tls_session *s, const char *name_in);
typedef int (TI_session_strength)(tls_session *sess);
typedef int (TI_session_unique)(tls_session *sess, struct berval *buf, int is_server);
+typedef int (TI_session_peercert)(tls_session *s, struct berval *der);
typedef void (TI_thr_init)(void);
@@ -69,6 +70,7 @@ typedef struct tls_impl {
TI_session_chkhost *ti_session_chkhost;
TI_session_strength *ti_session_strength;
TI_session_unique *ti_session_unique;
+ TI_session_peercert *ti_session_peercert;
Sockbuf_IO *ti_sbio;
diff --git a/libraries/libldap/tls2.c b/libraries/libldap/tls2.c
index 05fce3218..cbf73bdd5 100644
--- a/libraries/libldap/tls2.c
+++ b/libraries/libldap/tls2.c
@@ -718,6 +718,23 @@ ldap_pvt_tls_get_option( LDAP *ld, int option, void *arg )
case LDAP_OPT_X_TLS_CONNECT_ARG:
*(void **)arg = lo->ldo_tls_connect_arg;
break;
+ case LDAP_OPT_X_TLS_PEERCERT: {
+ void *sess = NULL;
+ struct berval *bv = arg;
+ bv->bv_len = 0;
+ bv->bv_val = NULL;
+ if ( ld != NULL ) {
+ LDAPConn *conn = ld->ld_defconn;
+ if ( conn != NULL ) {
+ Sockbuf *sb = conn->lconn_sb;
+ sess = ldap_pvt_tls_sb_ctx( sb );
+ if ( sess != NULL )
+ return ldap_pvt_tls_get_peercert( sess, bv );
+ }
+ }
+ break;
+ }
+
default:
return -1;
}
@@ -1050,6 +1066,13 @@ ldap_pvt_tls_get_unique( void *s, struct berval *buf, int is_server )
tls_session *session = s;
return tls_imp->ti_session_unique( session, buf, is_server );
}
+
+int
+ldap_pvt_tls_get_peercert( void *s, struct berval *der )
+{
+ tls_session *session = s;
+ return tls_imp->ti_session_peercert( session, der );
+}
#endif /* HAVE_TLS */
int
diff --git a/libraries/libldap/tls_g.c b/libraries/libldap/tls_g.c
index ce422387c..739680439 100644
--- a/libraries/libldap/tls_g.c
+++ b/libraries/libldap/tls_g.c
@@ -830,6 +830,24 @@ tlsg_session_unique( tls_session *sess, struct berval *buf, int is_server)
return 0;
}
+static int
+tlsg_session_peercert( tls_session *sess, struct berval *der )
+{
+ tlsg_session *s = (tlsg_session *)sess;
+ const gnutls_datum_t *peer_cert_list;
+ unsigned int list_size;
+
+ peer_cert_list = gnutls_certificate_get_peers( s->session, &list_size );
+ if (!peer_cert_list)
+ return -1;
+ der->bv_len = peer_cert_list[0].size;
+ der->bv_val = LDAP_MALLOC( der->bv_len );
+ if (!der->bv_val)
+ return -1;
+ memcpy(der->bv_val, peer_cert_list[0].data, der->bv_len);
+ return 0;
+}
+
/* suites is a string of colon-separated cipher suite names. */
static int
tlsg_parse_ciphers( tlsg_ctx *ctx, char *suites )
@@ -1166,6 +1184,7 @@ tls_impl ldap_int_tls_impl = {
tlsg_session_chkhost,
tlsg_session_strength,
tlsg_session_unique,
+ tlsg_session_peercert,
&tlsg_sbio,
diff --git a/libraries/libldap/tls_m.c b/libraries/libldap/tls_m.c
index 4bd9e63cb..36dc989ef 100644
--- a/libraries/libldap/tls_m.c
+++ b/libraries/libldap/tls_m.c
@@ -2891,6 +2891,22 @@ tlsm_session_unique( tls_session *sess, struct berval *buf, int is_server)
return 0;
}
+static int
+tlsm_session_peercert( tls_session *sess, struct berval *der )
+{
+ tlsm_session *s = (tlsm_session *)sess;
+ CERTCertificate *cert;
+ cert = SSL_PeerCertificate( s );
+ if (!cert)
+ return -1;
+ der->bv_len = cert->derCert.len;
+ der->bv_val = LDAP_MALLOC( der->bv_len );
+ if (!der->bv_val)
+ return -1;
+ memcpy( der->bv_val, cert->derCert.data, der->bv_len );
+ return 0;
+}
+
/*
* TLS support for LBER Sockbufs
*/
@@ -3322,6 +3338,7 @@ tls_impl ldap_int_tls_impl = {
tlsm_session_chkhost,
tlsm_session_strength,
tlsm_session_unique,
+ tlsm_session_peercert,
&tlsm_sbio,
diff --git a/libraries/libldap/tls_o.c b/libraries/libldap/tls_o.c
index 6288456d3..1fa50392f 100644
--- a/libraries/libldap/tls_o.c
+++ b/libraries/libldap/tls_o.c
@@ -721,6 +721,21 @@ tlso_session_unique( tls_session *sess, struct berval *buf, int is_server)
return buf->bv_len;
}
+static int
+tlso_session_peercert( tls_session *sess, struct berval *der )
+{
+ tlso_session *s = (tlso_session *)sess;
+ unsigned char *ptr;
+ X509 *x = SSL_get_peer_certificate(s);
+ der->bv_len = i2d_X509(x, NULL);
+ der->bv_val = LDAP_MALLOC(der->bv_len);
+ if ( !der->bv_val )
+ return -1;
+ ptr = der->bv_val;
+ i2d_X509(x, &ptr);
+ return 0;
+}
+
/*
* TLS support for LBER Sockbufs
*/
@@ -1229,6 +1244,7 @@ tls_impl ldap_int_tls_impl = {
tlso_session_chkhost,
tlso_session_strength,
tlso_session_unique,
+ tlso_session_peercert,
&tlso_sbio,
--
2.26.2
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