--- /dev/null
+/* lastbind.c - Record timestamp of the last successful bind to entries */
+/*
+ * 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 bindTimestamp attribute
+ int timestamp_precision;
+} lastbind_info;
+
+// Operational attributes
+static AttributeDescription *ad_bindTimestamp;
+
+// TODO: use a real OID
+#define BASE_OID_AT "OLcfgCtAt:99"
+#define BASE_OID_OC "OLcfgCtOc:99"
+static struct schema_info {
+ char *def;
+ AttributeDescription **ad;
+} lastBind_OpSchema[] = {
+ { "( "
+ BASE_OID_AT
+ ".1 "
+ "NAME ( 'bindTimestamp' ) "
+ "DESC 'The time the last successful bind occured' "
+ "EQUALITY generalizedTimeMatch "
+ "ORDERING generalizedTimeOrderingMatch "
+ "SYNTAX 1.3.6.1.4.1.1466.115.121.1.24 "
+ "SINGLE-VALUE NO-USER-MODIFICATION USAGE directoryOperation )",
+ &ad_bindTimestamp},
+ { 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),
+ "( "
+ BASE_OID_AT
+ ".2 "
+ "NAME 'olcLastBindPrecision' "
+ "DESC 'Precision of bindTimestamp attribute' "
+ "SYNTAX OMsInteger SINGLE-VALUE )", NULL, NULL },
+ { NULL, NULL, 0, 0, 0, ARG_IGNORED }
+};
+
+static ConfigOCs lastbindocs[] = {
+ { "( "
+ BASE_OID_OC
+ ".1 "
+ "NAME 'olcLastBindConfig' "
+ "DESC 'Last Bind configuration' "
+ "SUP olcOverlayConfig "
+ "MAY ( olcLastBindPrecision ) )",
+ 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;
+
+ 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;
+ }
+
+ // we're only interested if the bind was successful
+ if ( rs->sr_err == LDAP_SUCCESS ) {
+ 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 bindTimestamp attribute, if it exists
+ if ((a = attr_find( e->e_attrs, ad_bindTimestamp)) != 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 bindTimestamp in the user's entry with the current time
+ timestamp.bv_val = nowstr;
+ timestamp.bv_len = sizeof(nowstr);
+ slap_timestamp( &now, ×tamp );
+
+ m = ch_calloc( sizeof(Modifications), 1 );
+ m->sml_op = LDAP_MOD_REPLACE;
+ m->sml_flags = 0;
+ m->sml_type = ad_bindTimestamp->ad_cname;
+ m->sml_desc = ad_bindTimestamp;
+ 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], ×tamp );
+ ber_dupbv( &m->sml_nvalues[0], ×tamp );
+ 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 };
+
+ /* FIXME: Need to handle replication of the operational attribute...
+ * See password policy overlay */
+ op2.o_tag = LDAP_REQ_MODIFY;
+ op2.o_callback = &cb;
+ op2.orm_modlist = mod;
+ op2.o_dn = op->o_bd->be_rootdn;
+ op2.o_ndn = op->o_bd->be_rootndn;
+ 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 (bindTimestamp 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;
+ }
+ }
+
+ 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) */
--- /dev/null
+.TH SLAPO-LASTBIND 5 "RELEASEDATE" "OpenLDAP LDVERSION"
+.\" Copyright 2009 Jonathan Clarke, All Rights Reserved.
+.SH NAME
+slapo-lastbind \- lastbind overlay to slapd
+.SH SYNOPSIS
+ETCDIR/slapd.conf
+.SH DESCRIPTION
+The
+.B lastbind
+overlay to
+.BR slapd (8)
+allows recording the timestamp of the last successful bind to entries
+in the directory, in the
+.B bindTimestamp
+attribute.
+The overlay can be configured to update this timestamp only if it is
+older than a given value, thus avoiding large numbers of write
+operations penalizing performance.
+One sample use for this would be to detect unused accounts.
+
+.SH CONFIGURATION
+The config directives that are specific to the
+.B lastbind
+overlay must be prefixed by
+.BR lastbind\- ,
+to avoid potential conflicts with directives specific to the underlying
+database or to other stacked overlays.
+
+.TP
+.B overlay lastbind
+This directive adds the
+.B lastbind
+overlay to the current database, see
+.BR slapd.conf (5)
+for details.
+
+.LP
+This
+.B slapd.conf
+configuration option is defined for the lastbind overlay. It must
+appear after the
+.B overlay
+directive:
+.TP
+.B lastbind-precision <seconds>
+The value
+.B <seconds>
+is the number of seconds after which to update the
+.B bindTimestamp
+attribute in an entry. If the existing value of
+.B bindTimestamp
+is less than
+.B <seconds>
+old, it will not be changed.
+If this configuration option is omitted, the
+.B bindTimestamp
+attribute is updated on each successful bind operation.
+
+.SH EXAMPLE
+This example configures the
+.B lastbind
+overlay to store
+.B bindTimestamp
+in all entries in a database, with a 1 week precision.
+Add the following to
+.BR slapd.conf (5):
+
+.LP
+.nf
+ database <database>
+ # ...
+
+ overlay lastbind
+ lastbind-precision 604800
+.fi
+.LP
+.B slapd
+must also load
+.B lastbind.la,
+if compiled as a run-time module;
+
+.SH FILES
+.TP
+ETCDIR/slapd.conf
+default slapd configuration file
+.SH SEE ALSO
+.BR slapd.conf (5),
+.BR slapd (8).
+The
+.BR slapo-lastbind (5)
+overlay supports dynamic configuration via
+.BR back-config.
+.SH ACKNOWLEDGEMENTS
+.P
+This module was written in 2009 by Jonathan Clarke. It is loosely
+derived from the password policy overlay.
projects / openldap / commitdiff