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-rw-r--r--servers/slapd/bind.c555
1 files changed, 555 insertions, 0 deletions
diff --git a/servers/slapd/bind.c b/servers/slapd/bind.c
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+++ b/servers/slapd/bind.c
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+/* bind.c - decode an ldap bind operation and pass it to a backend db */
+/* $OpenLDAP$ */
+/* This work is part of OpenLDAP Software <http://www.openldap.org/>.
+ *
+ * Copyright 1998-2022 The OpenLDAP Foundation.
+ * 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>.
+ */
+/* Portions Copyright (c) 1995 Regents of the University of Michigan.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms are permitted
+ * provided that this notice is preserved and that due credit is given
+ * to the University of Michigan at Ann Arbor. The name of the University
+ * may not be used to endorse or promote products derived from this
+ * software without specific prior written permission. This software
+ * is provided ``as is'' without express or implied warranty.
+ */
+
+#include "portable.h"
+
+#include <stdio.h>
+
+#include <ac/string.h>
+#include <ac/socket.h>
+
+#include "lutil.h"
+#include "slap.h"
+
+int
+do_bind(
+ Operation *op,
+ SlapReply *rs )
+{
+ BerElement *ber = op->o_ber;
+ ber_int_t version;
+ ber_tag_t method;
+ struct berval mech = BER_BVNULL;
+ struct berval dn = BER_BVNULL;
+ ber_tag_t tag;
+ Backend *be = NULL;
+
+ Debug( LDAP_DEBUG_TRACE, "%s do_bind\n",
+ op->o_log_prefix );
+
+ /*
+ * Force the connection to "anonymous" until bind succeeds.
+ */
+ ldap_pvt_thread_mutex_lock( &op->o_conn->c_mutex );
+ if ( op->o_conn->c_sasl_bind_in_progress ) {
+ be = op->o_conn->c_authz_backend;
+ }
+ if ( !BER_BVISEMPTY( &op->o_conn->c_dn ) ) {
+ /* log authorization identity demotion */
+ Debug( LDAP_DEBUG_STATS,
+ "%s BIND anonymous mech=implicit bind_ssf=0 ssf=%d\n",
+ op->o_log_prefix, op->o_conn->c_ssf );
+ }
+ connection2anonymous( op->o_conn );
+ if ( op->o_conn->c_sasl_bind_in_progress ) {
+ op->o_conn->c_authz_backend = be;
+ }
+ ldap_pvt_thread_mutex_unlock( &op->o_conn->c_mutex );
+ if ( !BER_BVISNULL( &op->o_dn ) ) {
+ /* NOTE: temporarily wasting few bytes
+ * (until bind is completed), but saving
+ * a couple of ch_free() and ch_strdup("") */
+ op->o_dn.bv_val[0] = '\0';
+ op->o_dn.bv_len = 0;
+ }
+ if ( !BER_BVISNULL( &op->o_ndn ) ) {
+ op->o_ndn.bv_val[0] = '\0';
+ op->o_ndn.bv_len = 0;
+ }
+
+ /*
+ * Parse the bind request. It looks like this:
+ *
+ * BindRequest ::= SEQUENCE {
+ * version INTEGER, -- version
+ * name DistinguishedName, -- dn
+ * authentication CHOICE {
+ * simple [0] OCTET STRING -- passwd
+ * krbv42ldap [1] OCTET STRING -- OBSOLETE
+ * krbv42dsa [2] OCTET STRING -- OBSOLETE
+ * SASL [3] SaslCredentials
+ * }
+ * }
+ *
+ * SaslCredentials ::= SEQUENCE {
+ * mechanism LDAPString,
+ * credentials OCTET STRING OPTIONAL
+ * }
+ */
+
+ tag = ber_scanf( ber, "{imt" /*}*/, &version, &dn, &method );
+
+ if ( tag == LBER_ERROR ) {
+ Debug( LDAP_DEBUG_ANY, "%s do_bind: ber_scanf failed\n",
+ op->o_log_prefix );
+ send_ldap_discon( op, rs, LDAP_PROTOCOL_ERROR, "decoding error" );
+ rs->sr_err = SLAPD_DISCONNECT;
+ goto cleanup;
+ }
+
+ op->o_protocol = version;
+ op->orb_method = method;
+
+ if( op->orb_method != LDAP_AUTH_SASL ) {
+ tag = ber_scanf( ber, /*{*/ "m}", &op->orb_cred );
+
+ } else {
+ tag = ber_scanf( ber, "{m" /*}*/, &mech );
+
+ if ( tag != LBER_ERROR ) {
+ ber_len_t len;
+ tag = ber_peek_tag( ber, &len );
+
+ if ( tag == LDAP_TAG_LDAPCRED ) {
+ tag = ber_scanf( ber, "m", &op->orb_cred );
+ } else {
+ tag = LDAP_TAG_LDAPCRED;
+ BER_BVZERO( &op->orb_cred );
+ }
+
+ if ( tag != LBER_ERROR ) {
+ tag = ber_scanf( ber, /*{{*/ "}}" );
+ }
+ }
+ }
+
+ if ( tag == LBER_ERROR ) {
+ Debug( LDAP_DEBUG_ANY, "%s do_bind: ber_scanf failed\n",
+ op->o_log_prefix );
+ send_ldap_discon( op, rs, LDAP_PROTOCOL_ERROR, "decoding error" );
+ rs->sr_err = SLAPD_DISCONNECT;
+ goto cleanup;
+ }
+
+ if( get_ctrls( op, rs, 1 ) != LDAP_SUCCESS ) {
+ Debug( LDAP_DEBUG_ANY, "%s do_bind: get_ctrls failed\n",
+ op->o_log_prefix );
+ goto cleanup;
+ }
+
+ /* We use the tmpmemctx here because it speeds up normalization.
+ * However, we must dup with regular malloc when storing any
+ * resulting DNs in the op or conn structures.
+ */
+ rs->sr_err = dnPrettyNormal( NULL, &dn, &op->o_req_dn, &op->o_req_ndn,
+ op->o_tmpmemctx );
+ if ( rs->sr_err != LDAP_SUCCESS ) {
+ Debug( LDAP_DEBUG_ANY, "%s do_bind: invalid dn (%s)\n",
+ op->o_log_prefix, dn.bv_val );
+ send_ldap_error( op, rs, LDAP_INVALID_DN_SYNTAX, "invalid DN" );
+ goto cleanup;
+ }
+
+ Debug( LDAP_DEBUG_STATS, "%s BIND dn=\"%s\" method=%ld\n",
+ op->o_log_prefix, op->o_req_dn.bv_val,
+ (unsigned long) op->orb_method );
+
+ if( op->orb_method == LDAP_AUTH_SASL ) {
+ Debug( LDAP_DEBUG_TRACE, "do_bind: dn (%s) SASL mech %s\n",
+ op->o_req_dn.bv_val, mech.bv_val );
+
+ } else {
+ Debug( LDAP_DEBUG_TRACE,
+ "do_bind: version=%ld dn=\"%s\" method=%ld\n",
+ (unsigned long) version, op->o_req_dn.bv_val,
+ (unsigned long) op->orb_method );
+ }
+
+ if ( version < LDAP_VERSION_MIN || version > LDAP_VERSION_MAX ) {
+ Debug( LDAP_DEBUG_ANY, "%s do_bind: unknown version=%ld\n",
+ op->o_log_prefix, (unsigned long) version );
+ send_ldap_error( op, rs, LDAP_PROTOCOL_ERROR,
+ "requested protocol version not supported" );
+ goto cleanup;
+
+ } else if (!( global_allows & SLAP_ALLOW_BIND_V2 ) &&
+ version < LDAP_VERSION3 )
+ {
+ send_ldap_error( op, rs, LDAP_PROTOCOL_ERROR,
+ "historical protocol version requested, use LDAPv3 instead" );
+ goto cleanup;
+ }
+
+ /*
+ * we set connection version regardless of whether bind succeeds or not.
+ */
+ ldap_pvt_thread_mutex_lock( &op->o_conn->c_mutex );
+ op->o_conn->c_protocol = version;
+ ldap_pvt_thread_mutex_unlock( &op->o_conn->c_mutex );
+
+ op->orb_mech = mech;
+
+ op->o_bd = frontendDB;
+ rs->sr_err = frontendDB->be_bind( op, rs );
+
+cleanup:
+ if ( rs->sr_err == LDAP_SUCCESS ) {
+ if ( op->orb_method != LDAP_AUTH_SASL ) {
+ ber_dupbv( &op->o_conn->c_authmech, &mech );
+ }
+ op->o_conn->c_authtype = op->orb_method;
+ }
+
+ if( !BER_BVISNULL( &op->o_req_dn ) ) {
+ slap_sl_free( op->o_req_dn.bv_val, op->o_tmpmemctx );
+ BER_BVZERO( &op->o_req_dn );
+ }
+ if( !BER_BVISNULL( &op->o_req_ndn ) ) {
+ slap_sl_free( op->o_req_ndn.bv_val, op->o_tmpmemctx );
+ BER_BVZERO( &op->o_req_ndn );
+ }
+
+ return rs->sr_err;
+}
+
+int
+fe_op_bind( Operation *op, SlapReply *rs )
+{
+ BackendDB *bd = op->o_bd;
+
+ /* check for inappropriate controls */
+ if( get_manageDSAit( op ) == SLAP_CONTROL_CRITICAL ) {
+ send_ldap_error( op, rs,
+ LDAP_UNAVAILABLE_CRITICAL_EXTENSION,
+ "manageDSAit control inappropriate" );
+ goto cleanup;
+ }
+
+ if ( op->orb_method == LDAP_AUTH_SASL ) {
+ if ( op->o_protocol < LDAP_VERSION3 ) {
+ Debug( LDAP_DEBUG_ANY, "do_bind: sasl with LDAPv%ld\n",
+ (unsigned long)op->o_protocol );
+ send_ldap_discon( op, rs,
+ LDAP_PROTOCOL_ERROR, "SASL bind requires LDAPv3" );
+ rs->sr_err = SLAPD_DISCONNECT;
+ goto cleanup;
+ }
+
+ if( BER_BVISNULL( &op->orb_mech ) || BER_BVISEMPTY( &op->orb_mech ) ) {
+ Debug( LDAP_DEBUG_ANY,
+ "do_bind: no sasl mechanism provided\n" );
+ send_ldap_error( op, rs, LDAP_AUTH_METHOD_NOT_SUPPORTED,
+ "no SASL mechanism provided" );
+ goto cleanup;
+ }
+
+ /* check restrictions */
+ if( backend_check_restrictions( op, rs, &op->orb_mech ) != LDAP_SUCCESS ) {
+ send_ldap_result( op, rs );
+ goto cleanup;
+ }
+
+ ldap_pvt_thread_mutex_lock( &op->o_conn->c_mutex );
+ if ( op->o_conn->c_sasl_bind_in_progress ) {
+ if( !bvmatch( &op->o_conn->c_sasl_bind_mech, &op->orb_mech ) ) {
+ /* mechanism changed between bind steps */
+ slap_sasl_reset(op->o_conn);
+ }
+ } else {
+ ber_dupbv(&op->o_conn->c_sasl_bind_mech, &op->orb_mech);
+ }
+
+ /* Set the bindop for the benefit of in-directory SASL lookups */
+ op->o_conn->c_sasl_bindop = op;
+
+ ldap_pvt_thread_mutex_unlock( &op->o_conn->c_mutex );
+
+ rs->sr_err = slap_sasl_bind( op, rs );
+
+ goto cleanup;
+
+ } else {
+ /* Not SASL, cancel any in-progress bind */
+ ldap_pvt_thread_mutex_lock( &op->o_conn->c_mutex );
+
+ if ( !BER_BVISNULL( &op->o_conn->c_sasl_bind_mech ) ) {
+ free( op->o_conn->c_sasl_bind_mech.bv_val );
+ BER_BVZERO( &op->o_conn->c_sasl_bind_mech );
+ }
+ op->o_conn->c_sasl_bind_in_progress = 0;
+
+ slap_sasl_reset( op->o_conn );
+ ldap_pvt_thread_mutex_unlock( &op->o_conn->c_mutex );
+ }
+
+ if ( op->orb_method == LDAP_AUTH_SIMPLE ) {
+ BER_BVSTR( &op->orb_mech, "SIMPLE" );
+ /* accept "anonymous" binds */
+ if ( BER_BVISEMPTY( &op->orb_cred ) || BER_BVISEMPTY( &op->o_req_ndn ) ) {
+ rs->sr_err = LDAP_SUCCESS;
+
+ if( !BER_BVISEMPTY( &op->orb_cred ) &&
+ !( global_allows & SLAP_ALLOW_BIND_ANON_CRED ))
+ {
+ /* cred is not empty, disallow */
+ rs->sr_err = LDAP_INVALID_CREDENTIALS;
+
+ } else if ( !BER_BVISEMPTY( &op->o_req_ndn ) &&
+ !( global_allows & SLAP_ALLOW_BIND_ANON_DN ))
+ {
+ /* DN is not empty, disallow */
+ rs->sr_err = LDAP_UNWILLING_TO_PERFORM;
+ rs->sr_text =
+ "unauthenticated bind (DN with no password) disallowed";
+
+ } else if ( global_disallows & SLAP_DISALLOW_BIND_ANON ) {
+ /* disallow */
+ rs->sr_err = LDAP_INAPPROPRIATE_AUTH;
+ rs->sr_text = "anonymous bind disallowed";
+
+ } else {
+ backend_check_restrictions( op, rs, &op->orb_mech );
+ }
+
+ /*
+ * we already forced connection to "anonymous",
+ * just need to send success
+ */
+ send_ldap_result( op, rs );
+ Debug( LDAP_DEBUG_TRACE, "do_bind: v%d anonymous bind\n",
+ op->o_protocol );
+ goto cleanup;
+
+ } else if ( global_disallows & SLAP_DISALLOW_BIND_SIMPLE ) {
+ /* disallow simple authentication */
+ rs->sr_err = LDAP_UNWILLING_TO_PERFORM;
+ rs->sr_text = "unwilling to perform simple authentication";
+
+ send_ldap_result( op, rs );
+ Debug( LDAP_DEBUG_TRACE,
+ "do_bind: v%d simple bind(%s) disallowed\n",
+ op->o_protocol, op->o_req_ndn.bv_val );
+ goto cleanup;
+ }
+
+ } else {
+ rs->sr_err = LDAP_AUTH_METHOD_NOT_SUPPORTED;
+ rs->sr_text = "unknown authentication method";
+
+ send_ldap_result( op, rs );
+ Debug( LDAP_DEBUG_TRACE,
+ "do_bind: v%d unknown authentication method (%d)\n",
+ op->o_protocol, op->orb_method );
+ goto cleanup;
+ }
+
+ /*
+ * We could be serving multiple database backends. Select the
+ * appropriate one, or send a referral to our "referral server"
+ * if we don't hold it.
+ */
+
+ if ( (op->o_bd = select_backend( &op->o_req_ndn, 0 )) == NULL ) {
+ /* don't return referral for bind requests */
+ /* noSuchObject is not allowed to be returned by bind */
+ rs->sr_err = LDAP_INVALID_CREDENTIALS;
+ op->o_bd = bd;
+ send_ldap_result( op, rs );
+ goto cleanup;
+ }
+
+ /* check restrictions */
+ if( backend_check_restrictions( op, rs, NULL ) != LDAP_SUCCESS ) {
+ send_ldap_result( op, rs );
+ goto cleanup;
+ }
+
+ if( op->o_bd->be_bind ) {
+ op->o_conn->c_authz_cookie = NULL;
+
+ rs->sr_err = (op->o_bd->be_bind)( op, rs );
+
+ if ( rs->sr_err == 0 ) {
+ (void)fe_op_bind_success( op, rs );
+
+ } else if ( !BER_BVISNULL( &op->orb_edn ) ) {
+ free( op->orb_edn.bv_val );
+ BER_BVZERO( &op->orb_edn );
+ }
+
+ } else {
+ send_ldap_error( op, rs, LDAP_UNWILLING_TO_PERFORM,
+ "operation not supported within naming context" );
+ }
+
+cleanup:;
+ op->o_bd = bd;
+ return rs->sr_err;
+}
+
+int
+fe_op_lastbind( Operation *op )
+{
+ Operation op2 = *op;
+ SlapReply r2 = { REP_RESULT };
+ slap_callback cb = { NULL, slap_null_cb, NULL, NULL };
+ LDAPControl c, *ca[2];
+ Modifications *m;
+ Entry *e;
+ Attribute *a;
+ char nowstr[ LDAP_LUTIL_GENTIME_BUFSIZE ];
+ struct berval timestamp;
+ time_t bindtime = (time_t)-1;
+ int rc;
+
+ rc = be_entry_get_rw( op, &op->o_conn->c_ndn, NULL, NULL, 0, &e );
+ if ( rc != LDAP_SUCCESS ) {
+ return -1;
+ }
+
+ /* get authTimestamp attribute, if it exists */
+ if ( (a = attr_find( e->e_attrs, slap_schema.si_ad_pwdLastSuccess )) != NULL ) {
+ struct lutil_tm tm;
+ struct lutil_timet tt;
+
+ if ( lutil_parsetime( a->a_nvals[0].bv_val, &tm ) == 0 ) {
+ lutil_tm2time( &tm, &tt );
+ bindtime = tt.tt_sec;
+ }
+ Debug( LDAP_DEBUG_TRACE, "fe_op_lastbind: "
+ "old pwdLastSuccess value=%s %lds ago\n",
+ a->a_nvals[0].bv_val, bindtime == (time_t)-1 ? -1 : op->o_time - bindtime );
+
+ /*
+ * TODO: If the recorded bind time is within configurable precision,
+ * it doesn't need to be updated (save a write for nothing)
+ */
+ if ( bindtime != (time_t)-1 && op->o_time <= bindtime ) {
+ be_entry_release_r( op, e );
+ return LDAP_SUCCESS;
+ }
+ }
+
+ /* update the authTimestamp in the user's entry with the current time */
+ timestamp.bv_val = nowstr;
+ timestamp.bv_len = sizeof(nowstr);
+ slap_timestamp( &op->o_time, &timestamp );
+
+ m = ch_calloc( sizeof(Modifications), 1 );
+ m->sml_op = LDAP_MOD_REPLACE;
+ m->sml_flags = 0;
+ m->sml_type = slap_schema.si_ad_pwdLastSuccess->ad_cname;
+ m->sml_desc = slap_schema.si_ad_pwdLastSuccess;
+ 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 );
+
+ be_entry_release_r( op, e );
+
+ op2.o_tag = LDAP_REQ_MODIFY;
+ op2.o_req_dn = op->o_conn->c_dn;
+ op2.o_req_ndn = op->o_conn->c_ndn;
+ op2.o_callback = &cb;
+ op2.orm_modlist = m;
+ op2.orm_no_opattrs = 0;
+ op2.o_dn = op->o_bd->be_rootdn;
+ op2.o_ndn = op->o_bd->be_rootndn;
+
+ /*
+ * TODO: this is core+frontend, not everything works the same way?
+ */
+ /*
+ * 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 ) ) {
+ /* 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;
+ }
+ }
+
+ rc = op2.o_bd->be_modify( &op2, &r2 );
+ slap_mods_free( m, 1 );
+
+done:
+ return rc;
+}
+
+int
+fe_op_bind_success( Operation *op, SlapReply *rs )
+{
+ ldap_pvt_thread_mutex_lock( &op->o_conn->c_mutex );
+
+ if( op->o_conn->c_authz_backend == NULL ) {
+ op->o_conn->c_authz_backend = op->o_bd;
+ }
+
+ /* be_bind returns regular/global edn */
+ if( !BER_BVISEMPTY( &op->orb_edn ) ) {
+ op->o_conn->c_dn = op->orb_edn;
+ } else {
+ ber_dupbv(&op->o_conn->c_dn, &op->o_req_dn);
+ }
+
+ ber_dupbv( &op->o_conn->c_ndn, &op->o_req_ndn );
+
+ /* op->o_conn->c_sb may be 0 for internal operations */
+ if( !BER_BVISEMPTY( &op->o_conn->c_dn ) && op->o_conn->c_sb != 0 ) {
+ ber_len_t max = sockbuf_max_incoming_auth;
+ ber_sockbuf_ctrl( op->o_conn->c_sb,
+ LBER_SB_OPT_SET_MAX_INCOMING, &max );
+ }
+
+ /* log authorization identity */
+ Debug( LDAP_DEBUG_STATS,
+ "%s BIND dn=\"%s\" mech=%s bind_ssf=0 ssf=%d\n",
+ op->o_log_prefix,
+ op->o_conn->c_dn.bv_val, op->orb_mech.bv_val, op->o_conn->c_ssf );
+
+ Debug( LDAP_DEBUG_TRACE,
+ "do_bind: v%d bind: \"%s\" to \"%s\"\n",
+ op->o_protocol, op->o_req_dn.bv_val, op->o_conn->c_dn.bv_val );
+
+ ldap_pvt_thread_mutex_unlock( &op->o_conn->c_mutex );
+
+ if ( SLAP_LASTBIND( op->o_bd ) ) {
+ fe_op_lastbind( op );
+ }
+
+ /* send this here to avoid a race condition */
+ send_ldap_result( op, rs );
+
+ return LDAP_SUCCESS;
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-22 10:00:24 +0000