Adding upstream version 2.4.57+dfsg.upstream/2.4.57+dfsgupstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 317 insertions, 0 deletions

diff --git a/contrib/slapd-modules/lastbind/lastbind.c b/contrib/slapd-modules/lastbind/lastbind.c
new file mode 100644
index 0000000..311be04
--- /dev/null
+++ b/contrib/slapd-modules/lastbind/lastbind.c
@@ -0,0 +1,317 @@
+/* lastbind.c - Record timestamp of the last successful bind to entries */
+/* $OpenLDAP$ */
+/*
+ * Copyright 2009 Jonathan Clarke <jonathan@phillipoux.net>.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted only as authorized by the OpenLDAP
+ * Public License.
+ *
+ * A copy of this license is available in the file LICENSE in the
+ * top-level directory of the distribution or, alternatively, at
+ * <http://www.OpenLDAP.org/license.html>.
+ */
+/* ACKNOWLEDGEMENTS:
+ * This work is loosely derived from the ppolicy overlay.
+ */
+
+#include "portable.h"
+
+/*
+ * This file implements an overlay that stores the timestamp of the
+ * last successful bind operation in a directory entry.
+ *
+ * Optimization: to avoid performing a write on each bind,
+ * a precision for this timestamp may be configured, causing it to
+ * only be updated if it is older than a given number of seconds.
+ */
+
+#ifdef SLAPD_OVER_LASTBIND
+
+#include <ldap.h>
+#include "lutil.h"
+#include "slap.h"
+#include <ac/errno.h>
+#include <ac/time.h>
+#include <ac/string.h>
+#include <ac/ctype.h>
+#include "config.h"
+
+/* Per-instance configuration information */
+typedef struct lastbind_info {
+	/* precision to update timestamp in authTimestamp attribute */
+	int timestamp_precision;
+	int forward_updates;	/* use frontend for authTimestamp updates */
+} lastbind_info;
+
+/* Operational attributes */
+static AttributeDescription *ad_authTimestamp;
+
+/* This is the definition used by ISODE, as supplied to us in
+ * ITS#6238 Followup #9
+ */
+static struct schema_info {
+	char *def;
+	AttributeDescription **ad;
+} lastBind_OpSchema[] = {
+	{	"( 1.3.6.1.4.1.453.16.2.188 "
+		"NAME 'authTimestamp' "
+		"DESC 'last successful authentication using any method/mech' "
+		"EQUALITY generalizedTimeMatch "
+		"ORDERING generalizedTimeOrderingMatch "
+		"SYNTAX 1.3.6.1.4.1.1466.115.121.1.24 "
+		"SINGLE-VALUE NO-USER-MODIFICATION USAGE dsaOperation )",
+		&ad_authTimestamp},
+	{ NULL, NULL }
+};
+
+/* configuration attribute and objectclass */
+static ConfigTable lastbindcfg[] = {
+	{ "lastbind-precision", "seconds", 2, 2, 0,
+	  ARG_INT|ARG_OFFSET,
+	  (void *)offsetof(lastbind_info, timestamp_precision),
+	  "( OLcfgCtAt:5.1 "
+	  "NAME 'olcLastBindPrecision' "
+	  "DESC 'Precision of authTimestamp attribute' "
+	  "SYNTAX OMsInteger SINGLE-VALUE )", NULL, NULL },
+	{ "lastbind_forward_updates", "on|off", 1, 2, 0,
+	  ARG_ON_OFF|ARG_OFFSET,
+	  (void *)offsetof(lastbind_info,forward_updates),
+	  "( OLcfgAt:5.2 NAME 'olcLastBindForwardUpdates' "
+	  "DESC 'Allow authTimestamp updates to be forwarded via updateref' "
+	  "SYNTAX OMsBoolean SINGLE-VALUE )", NULL, NULL },
+	{ NULL, NULL, 0, 0, 0, ARG_IGNORED }
+};
+
+static ConfigOCs lastbindocs[] = {
+	{ "( OLcfgCtOc:5.1 "
+	  "NAME 'olcLastBindConfig' "
+	  "DESC 'Last Bind configuration' "
+	  "SUP olcOverlayConfig "
+	  "MAY ( olcLastBindPrecision $ olcLastBindForwardUpdates) )",
+	  Cft_Overlay, lastbindcfg, NULL, NULL },
+	{ NULL, 0, NULL }
+};
+
+static time_t
+parse_time( char *atm )
+{
+	struct lutil_tm tm;
+	struct lutil_timet tt;
+	time_t ret = (time_t)-1;
+
+	if ( lutil_parsetime( atm, &tm ) == 0) {
+		lutil_tm2time( &tm, &tt );
+		ret = tt.tt_sec;
+	}
+	return ret;
+}
+
+static int
+lastbind_bind_response( Operation *op, SlapReply *rs )
+{
+	Modifications *mod = NULL;
+	BackendInfo *bi = op->o_bd->bd_info;
+	Entry *e;
+	int rc;
+
+	/* we're only interested if the bind was successful */
+	if ( rs->sr_err != LDAP_SUCCESS )
+		return SLAP_CB_CONTINUE;
+
+	rc = be_entry_get_rw( op, &op->o_req_ndn, NULL, NULL, 0, &e );
+	op->o_bd->bd_info = bi;
+
+	if ( rc != LDAP_SUCCESS ) {
+		return SLAP_CB_CONTINUE;
+	}
+
+	{
+		lastbind_info *lbi = (lastbind_info *) op->o_callback->sc_private;
+
+		time_t now, bindtime = (time_t)-1;
+		Attribute *a;
+		Modifications *m;
+		char nowstr[ LDAP_LUTIL_GENTIME_BUFSIZE ];
+		struct berval timestamp;
+
+		/* get the current time */
+		now = slap_get_time();
+
+		/* get authTimestamp attribute, if it exists */
+		if ((a = attr_find( e->e_attrs, ad_authTimestamp)) != NULL) {
+			bindtime = parse_time( a->a_nvals[0].bv_val );
+
+			if (bindtime != (time_t)-1) {
+				/* if the recorded bind time is within our precision, we're done
+				 * it doesn't need to be updated (save a write for nothing) */
+				if ((now - bindtime) < lbi->timestamp_precision) {
+					goto done;
+				}
+			}
+		}
+
+		/* update the authTimestamp in the user's entry with the current time */
+		timestamp.bv_val = nowstr;
+		timestamp.bv_len = sizeof(nowstr);
+		slap_timestamp( &now, &timestamp );
+
+		m = ch_calloc( sizeof(Modifications), 1 );
+		m->sml_op = LDAP_MOD_REPLACE;
+		m->sml_flags = 0;
+		m->sml_type = ad_authTimestamp->ad_cname;
+		m->sml_desc = ad_authTimestamp;
+		m->sml_numvals = 1;
+		m->sml_values = ch_calloc( sizeof(struct berval), 2 );
+		m->sml_nvalues = ch_calloc( sizeof(struct berval), 2 );
+
+		ber_dupbv( &m->sml_values[0], &timestamp );
+		ber_dupbv( &m->sml_nvalues[0], &timestamp );
+		m->sml_next = mod;
+		mod = m;
+	}
+
+done:
+	be_entry_release_r( op, e );
+
+	/* perform the update, if necessary */
+	if ( mod ) {
+		Operation op2 = *op;
+		SlapReply r2 = { REP_RESULT };
+		slap_callback cb = { NULL, slap_null_cb, NULL, NULL };
+		LDAPControl c, *ca[2];
+		lastbind_info *lbi = (lastbind_info *) op->o_callback->sc_private;
+
+		/* This is a DSA-specific opattr, it never gets replicated. */
+		op2.o_tag = LDAP_REQ_MODIFY;
+		op2.o_callback = &cb;
+		op2.orm_modlist = mod;
+		op2.orm_no_opattrs = 0;
+		op2.o_dn = op->o_bd->be_rootdn;
+		op2.o_ndn = op->o_bd->be_rootndn;
+
+		/*
+		 * Code for forwarding of updates adapted from ppolicy.c of slapo-ppolicy
+		 *
+		 * If this server is a shadow and forward_updates is true,
+		 * use the frontend to perform this modify. That will trigger
+		 * the update referral, which can then be forwarded by the
+		 * chain overlay. Obviously the updateref and chain overlay
+		 * must be configured appropriately for this to be useful.
+		 */
+		if ( SLAP_SHADOW( op->o_bd ) && lbi->forward_updates ) {
+			op2.o_bd = frontendDB;
+
+			/* Must use Relax control since these are no-user-mod */
+			op2.o_relax = SLAP_CONTROL_CRITICAL;
+			op2.o_ctrls = ca;
+			ca[0] = &c;
+			ca[1] = NULL;
+			BER_BVZERO( &c.ldctl_value );
+			c.ldctl_iscritical = 1;
+			c.ldctl_oid = LDAP_CONTROL_RELAX;
+		} else {
+			/* If not forwarding, don't update opattrs and don't replicate */
+			if ( SLAP_SINGLE_SHADOW( op->o_bd )) {
+				op2.orm_no_opattrs = 1;
+				op2.o_dont_replicate = 1;
+			}
+			/* TODO: not sure what this does in slapo-ppolicy */
+			/*
+			op2.o_bd->bd_info = (BackendInfo *)on->on_info;
+			*/
+		}
+
+		rc = op->o_bd->be_modify( &op2, &r2 );
+		slap_mods_free( mod, 1 );
+	}
+
+	op->o_bd->bd_info = bi;
+	return SLAP_CB_CONTINUE;
+}
+
+static int
+lastbind_bind( Operation *op, SlapReply *rs )
+{
+	slap_callback *cb;
+	slap_overinst *on = (slap_overinst *) op->o_bd->bd_info;
+
+	/* setup a callback to intercept result of this bind operation
+	 * and pass along the lastbind_info struct */
+	cb = op->o_tmpcalloc( sizeof(slap_callback), 1, op->o_tmpmemctx );
+	cb->sc_response = lastbind_bind_response;
+	cb->sc_next = op->o_callback->sc_next;
+	cb->sc_private = on->on_bi.bi_private;
+	op->o_callback->sc_next = cb;
+
+	return SLAP_CB_CONTINUE;
+}
+
+static int
+lastbind_db_init(
+	BackendDB *be,
+	ConfigReply *cr
+)
+{
+	slap_overinst *on = (slap_overinst *) be->bd_info;
+
+	/* initialize private structure to store configuration */
+	on->on_bi.bi_private = ch_calloc( 1, sizeof(lastbind_info) );
+
+	return 0;
+}
+
+static int
+lastbind_db_close(
+	BackendDB *be,
+	ConfigReply *cr
+)
+{
+	slap_overinst *on = (slap_overinst *) be->bd_info;
+	lastbind_info *lbi = (lastbind_info *) on->on_bi.bi_private;
+
+	/* free private structure to store configuration */
+	free( lbi );
+
+	return 0;
+}
+
+static slap_overinst lastbind;
+
+int lastbind_initialize()
+{
+	int i, code;
+
+	/* register operational schema for this overlay (authTimestamp attribute) */
+	for (i=0; lastBind_OpSchema[i].def; i++) {
+		code = register_at( lastBind_OpSchema[i].def, lastBind_OpSchema[i].ad, 0 );
+		if ( code ) {
+			Debug( LDAP_DEBUG_ANY,
+				"lastbind_initialize: register_at failed\n", 0, 0, 0 );
+			return code;
+		}
+	}
+
+	ad_authTimestamp->ad_type->sat_flags |= SLAP_AT_MANAGEABLE;
+
+	lastbind.on_bi.bi_type = "lastbind";
+	lastbind.on_bi.bi_db_init = lastbind_db_init;
+	lastbind.on_bi.bi_db_close = lastbind_db_close;
+	lastbind.on_bi.bi_op_bind = lastbind_bind;
+
+	/* register configuration directives */
+	lastbind.on_bi.bi_cf_ocs = lastbindocs;
+	code = config_register_schema( lastbindcfg, lastbindocs );
+	if ( code ) return code;
+
+	return overlay_register( &lastbind );
+}
+
+#if SLAPD_OVER_LASTBIND == SLAPD_MOD_DYNAMIC
+int init_module(int argc, char *argv[]) {
+	return lastbind_initialize();
+}
+#endif
+
+#endif	/* defined(SLAPD_OVER_LASTBIND) */