/* bind.c - decode an ldap bind operation and pass it to a backend db */ /* $OpenLDAP$ */ /* * Copyright 1998-2003 The OpenLDAP Foundation, All Rights Reserved. * COPYING RESTRICTIONS APPLY, see COPYRIGHT file */ /* * 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 #include #include #include "ldap_pvt.h" #include "slap.h" #ifdef LDAP_SLAPI #include "slapi.h" #endif int do_bind( Connection *conn, Operation *op ) { BerElement *ber = op->o_ber; ber_int_t version; ber_tag_t method; struct berval mech = { 0, NULL }; struct berval dn = { 0, NULL }; struct berval pdn = { 0, NULL }; struct berval ndn = { 0, NULL }; struct berval edn = { 0, NULL }; ber_tag_t tag; int rc = LDAP_SUCCESS; const char *text; struct berval cred = { 0, NULL }; Backend *be = NULL; #ifdef LDAP_SLAPI Slapi_PBlock *pb = op->o_pb; #endif #ifdef NEW_LOGGING LDAP_LOG( OPERATION, ENTRY, "do_bind: conn %d\n", conn->c_connid, 0, 0 ); #else Debug( LDAP_DEBUG_TRACE, "do_bind\n", 0, 0, 0 ); #endif /* * Force to connection to "anonymous" until bind succeeds. */ ldap_pvt_thread_mutex_lock( &conn->c_mutex ); if ( conn->c_sasl_bind_in_progress ) be = conn->c_authz_backend; /* log authorization identity demotion */ if ( conn->c_dn.bv_len ) { Statslog( LDAP_DEBUG_STATS, "conn=%lu op=%lu BIND anonymous mech=implicit ssf=0", op->o_connid, op->o_opid, 0, 0, 0 ); } connection2anonymous( conn ); if ( conn->c_sasl_bind_in_progress ) conn->c_authz_backend = be; ldap_pvt_thread_mutex_unlock( &conn->c_mutex ); if ( op->o_dn.bv_val != NULL ) { free( op->o_dn.bv_val ); op->o_dn.bv_val = ch_strdup( "" ); op->o_dn.bv_len = 0; } if ( op->o_ndn.bv_val != NULL ) { free( op->o_ndn.bv_val ); op->o_ndn.bv_val = ch_strdup( "" ); 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 * krbv42dsa [2] OCTET STRING * SASL [3] SaslCredentials * } * } * * SaslCredentials ::= SEQUENCE { * mechanism LDAPString, * credentials OCTET STRING OPTIONAL * } */ tag = ber_scanf( ber, "{imt" /*}*/, &version, &dn, &method ); if ( tag == LBER_ERROR ) { #ifdef NEW_LOGGING LDAP_LOG( OPERATION, ERR, "do_bind: conn %d ber_scanf failed\n", conn->c_connid, 0, 0 ); #else Debug( LDAP_DEBUG_ANY, "bind: ber_scanf failed\n", 0, 0, 0 ); #endif send_ldap_disconnect( conn, op, LDAP_PROTOCOL_ERROR, "decoding error" ); rc = -1; goto cleanup; } op->o_protocol = version; if( method != LDAP_AUTH_SASL ) { tag = ber_scanf( ber, /*{*/ "m}", &cred ); } else { tag = ber_scanf( ber, "{o" /*}*/, &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", &cred ); } else { tag = LDAP_TAG_LDAPCRED; cred.bv_val = NULL; cred.bv_len = 0; } if ( tag != LBER_ERROR ) { tag = ber_scanf( ber, /*{{*/ "}}" ); } } } if ( tag == LBER_ERROR ) { send_ldap_disconnect( conn, op, LDAP_PROTOCOL_ERROR, "decoding error" ); rc = SLAPD_DISCONNECT; goto cleanup; } if( (rc = get_ctrls( conn, op, 1 )) != LDAP_SUCCESS ) { #ifdef NEW_LOGGING LDAP_LOG( OPERATION, INFO, "do_bind: conn %d get_ctrls failed\n", conn->c_connid, 0, 0 ); #else Debug( LDAP_DEBUG_ANY, "do_bind: get_ctrls failed\n", 0, 0, 0 ); #endif goto cleanup; } rc = dnPrettyNormal( NULL, &dn, &pdn, &ndn ); if ( rc != LDAP_SUCCESS ) { #ifdef NEW_LOGGING LDAP_LOG( OPERATION, INFO, "do_bind: conn %d invalid dn (%s)\n", conn->c_connid, dn.bv_val, 0 ); #else Debug( LDAP_DEBUG_ANY, "bind: invalid dn (%s)\n", dn.bv_val, 0, 0 ); #endif send_ldap_result( conn, op, rc = LDAP_INVALID_DN_SYNTAX, NULL, "invalid DN", NULL, NULL ); goto cleanup; } if( method == LDAP_AUTH_SASL ) { #ifdef NEW_LOGGING LDAP_LOG( OPERATION, DETAIL1, "do_sasl_bind: conn %d dn (%s) mech %s\n", conn->c_connid, pdn.bv_val, mech.bv_val ); #else Debug( LDAP_DEBUG_TRACE, "do_sasl_bind: dn (%s) mech %s\n", pdn.bv_val, mech.bv_val, NULL ); #endif } else { #ifdef NEW_LOGGING LDAP_LOG( OPERATION, DETAIL1, "do_bind: version=%ld dn=\"%s\" method=%ld\n", (unsigned long) version, pdn.bv_val, (unsigned long)method ); #else Debug( LDAP_DEBUG_TRACE, "do_bind: version=%ld dn=\"%s\" method=%ld\n", (unsigned long) version, pdn.bv_val, (unsigned long) method ); #endif } Statslog( LDAP_DEBUG_STATS, "conn=%lu op=%lu BIND dn=\"%s\" method=%ld\n", op->o_connid, op->o_opid, pdn.bv_val, (unsigned long) method, 0 ); if ( version < LDAP_VERSION_MIN || version > LDAP_VERSION_MAX ) { #ifdef NEW_LOGGING LDAP_LOG( OPERATION, INFO, "do_bind: conn %d unknown version = %ld\n", conn->c_connid, (unsigned long)version, 0 ); #else Debug( LDAP_DEBUG_ANY, "do_bind: unknown version=%ld\n", (unsigned long) version, 0, 0 ); #endif send_ldap_result( conn, op, rc = LDAP_PROTOCOL_ERROR, NULL, "requested protocol version not supported", NULL, NULL ); goto cleanup; } else if (!( global_allows & SLAP_ALLOW_BIND_V2 ) && version < LDAP_VERSION3 ) { send_ldap_result( conn, op, rc = LDAP_PROTOCOL_ERROR, NULL, "historical protocol version requested, use LDAPv3 instead", NULL, NULL ); goto cleanup; } /* we set connection version regardless of whether bind succeeds * or not. */ ldap_pvt_thread_mutex_lock( &conn->c_mutex ); conn->c_protocol = version; ldap_pvt_thread_mutex_unlock( &conn->c_mutex ); /* check for inappropriate controls */ if( get_manageDSAit( op ) == SLAP_CRITICAL_CONTROL ) { send_ldap_result( conn, op, rc = LDAP_UNAVAILABLE_CRITICAL_EXTENSION, NULL, "manageDSAit control inappropriate", NULL, NULL ); goto cleanup; } /* Set the bindop for the benefit of in-directory SASL lookups */ conn->c_sasl_bindop = op; if ( method == LDAP_AUTH_SASL ) { slap_ssf_t ssf = 0; if ( version < LDAP_VERSION3 ) { #ifdef NEW_LOGGING LDAP_LOG( OPERATION, INFO, "do_bind: conn %d sasl with LDAPv%ld\n", conn->c_connid, (unsigned long)version , 0 ); #else Debug( LDAP_DEBUG_ANY, "do_bind: sasl with LDAPv%ld\n", (unsigned long) version, 0, 0 ); #endif send_ldap_disconnect( conn, op, LDAP_PROTOCOL_ERROR, "SASL bind requires LDAPv3" ); rc = SLAPD_DISCONNECT; goto cleanup; } if( mech.bv_len == 0 ) { #ifdef NEW_LOGGING LDAP_LOG( OPERATION, INFO, "do_bind: conn %d no SASL mechanism provided\n", conn->c_connid, 0, 0 ); #else Debug( LDAP_DEBUG_ANY, "do_bind: no sasl mechanism provided\n", 0, 0, 0 ); #endif send_ldap_result( conn, op, rc = LDAP_AUTH_METHOD_NOT_SUPPORTED, NULL, "no SASL mechanism provided", NULL, NULL ); goto cleanup; } /* check restrictions */ rc = backend_check_restrictions( NULL, conn, op, &mech, &text ); if( rc != LDAP_SUCCESS ) { send_ldap_result( conn, op, rc, NULL, text, NULL, NULL ); goto cleanup; } ldap_pvt_thread_mutex_lock( &conn->c_mutex ); if ( conn->c_sasl_bind_in_progress ) { if( !bvmatch( &conn->c_sasl_bind_mech, &mech ) ) { /* mechanism changed between bind steps */ slap_sasl_reset(conn); } } else { conn->c_sasl_bind_mech = mech; mech.bv_val = NULL; mech.bv_len = 0; } ldap_pvt_thread_mutex_unlock( &conn->c_mutex ); rc = slap_sasl_bind( conn, op, &pdn, &ndn, &cred, &edn, &ssf ); ldap_pvt_thread_mutex_lock( &conn->c_mutex ); if( rc == LDAP_SUCCESS ) { conn->c_dn = edn; if( edn.bv_len != 0 ) { /* edn is always normalized already */ ber_dupbv( &conn->c_ndn, &conn->c_dn ); } conn->c_authmech = conn->c_sasl_bind_mech; conn->c_sasl_bind_mech.bv_val = NULL; conn->c_sasl_bind_mech.bv_len = 0; conn->c_sasl_bind_in_progress = 0; conn->c_sasl_ssf = ssf; if( ssf > conn->c_ssf ) { conn->c_ssf = ssf; } if( conn->c_dn.bv_len != 0 ) { ber_len_t max = sockbuf_max_incoming_auth; ber_sockbuf_ctrl( conn->c_sb, LBER_SB_OPT_SET_MAX_INCOMING, &max ); } /* log authorization identity */ Statslog( LDAP_DEBUG_STATS, "conn=%lu op=%lu BIND dn=\"%s\" mech=%s ssf=%d\n", op->o_connid, op->o_opid, conn->c_dn.bv_val ? conn->c_dn.bv_val : "", conn->c_authmech.bv_val, ssf ); #ifdef NEW_LOGGING LDAP_LOG( OPERATION, DETAIL1, "do_bind: SASL/%s bind: dn=\"%s\" ssf=%d\n", conn->c_authmech.bv_val, conn->c_dn.bv_val ? conn->c_dn.bv_val : "", ssf ); #else Debug( LDAP_DEBUG_TRACE, "do_bind: SASL/%s bind: dn=\"%s\" ssf=%d\n", conn->c_authmech.bv_val, conn->c_dn.bv_val ? conn->c_dn.bv_val : "", ssf ); #endif } else if ( rc == LDAP_SASL_BIND_IN_PROGRESS ) { conn->c_sasl_bind_in_progress = 1; } else { if ( conn->c_sasl_bind_mech.bv_val ) { free( conn->c_sasl_bind_mech.bv_val ); conn->c_sasl_bind_mech.bv_val = NULL; conn->c_sasl_bind_mech.bv_len = 0; } conn->c_sasl_bind_in_progress = 0; } ldap_pvt_thread_mutex_unlock( &conn->c_mutex ); goto cleanup; } else { /* Not SASL, cancel any in-progress bind */ ldap_pvt_thread_mutex_lock( &conn->c_mutex ); if ( conn->c_sasl_bind_mech.bv_val != NULL ) { free(conn->c_sasl_bind_mech.bv_val); conn->c_sasl_bind_mech.bv_val = NULL; conn->c_sasl_bind_mech.bv_len = 0; } conn->c_sasl_bind_in_progress = 0; slap_sasl_reset( conn ); ldap_pvt_thread_mutex_unlock( &conn->c_mutex ); } if ( method == LDAP_AUTH_SIMPLE ) { /* accept "anonymous" binds */ if ( cred.bv_len == 0 || ndn.bv_len == 0 ) { rc = LDAP_SUCCESS; text = NULL; if( cred.bv_len && !( global_allows & SLAP_ALLOW_BIND_ANON_CRED )) { /* cred is not empty, disallow */ rc = LDAP_INVALID_CREDENTIALS; } else if ( ndn.bv_len && !( global_allows & SLAP_ALLOW_BIND_ANON_DN )) { /* DN is not empty, disallow */ rc = LDAP_UNWILLING_TO_PERFORM; text = "unauthenticated bind (DN with no password) disallowed"; } else if ( global_disallows & SLAP_DISALLOW_BIND_ANON ) { /* disallow */ rc = LDAP_INAPPROPRIATE_AUTH; text = "anonymous bind disallowed"; } else { rc = backend_check_restrictions( NULL, conn, op, &mech, &text ); } /* * we already forced connection to "anonymous", * just need to send success */ send_ldap_result( conn, op, rc, NULL, text, NULL, NULL ); #ifdef NEW_LOGGING LDAP_LOG( OPERATION, DETAIL1, "do_bind: conn %d v%d anonymous bind\n", conn->c_connid, version , 0 ); #else Debug( LDAP_DEBUG_TRACE, "do_bind: v%d anonymous bind\n", version, 0, 0 ); #endif goto cleanup; } else if ( global_disallows & SLAP_DISALLOW_BIND_SIMPLE ) { /* disallow simple authentication */ rc = LDAP_UNWILLING_TO_PERFORM; text = "unwilling to perform simple authentication"; send_ldap_result( conn, op, rc, NULL, text, NULL, NULL ); #ifdef NEW_LOGGING LDAP_LOG( OPERATION, INFO, "do_bind: conn %d v%d simple bind(%s) disallowed\n", conn->c_connid, version, ndn.bv_val ); #else Debug( LDAP_DEBUG_TRACE, "do_bind: v%d simple bind(%s) disallowed\n", version, ndn.bv_val, 0 ); #endif goto cleanup; } else if (( global_disallows & SLAP_DISALLOW_BIND_SIMPLE_UNPROTECTED ) && ( op->o_ssf <= 1 )) { rc = LDAP_CONFIDENTIALITY_REQUIRED; text = "unwilling to perform simple authentication " "without confidentilty protection"; send_ldap_result( conn, op, rc, NULL, text, NULL, NULL ); #ifdef NEW_LOGGING LDAP_LOG( OPERATION, INFO, "do_bind: conn %d " "v%d unprotected simple bind(%s) disallowed\n", conn->c_connid, version, ndn.bv_val ); #else Debug( LDAP_DEBUG_TRACE, "do_bind: v%d unprotected simple bind(%s) disallowed\n", version, ndn.bv_val, 0 ); #endif goto cleanup; } #ifdef LDAP_API_FEATURE_X_OPENLDAP_V2_KBIND } else if ( method == LDAP_AUTH_KRBV41 || method == LDAP_AUTH_KRBV42 ) { if ( global_disallows & SLAP_DISALLOW_BIND_KRBV4 ) { /* disallow simple authentication */ rc = LDAP_UNWILLING_TO_PERFORM; text = "unwilling to perform Kerberos V4 bind"; send_ldap_result( conn, op, rc, NULL, text, NULL, NULL ); #ifdef NEW_LOGGING LDAP_LOG( OPERATION, DETAIL1, "do_bind: conn %d v%d Kerberos V4 bind\n", conn->c_connid, version , 0 ); #else Debug( LDAP_DEBUG_TRACE, "do_bind: v%d Kerberos V4 bind\n", version, 0, 0 ); #endif goto cleanup; } #endif } else { rc = LDAP_AUTH_METHOD_NOT_SUPPORTED; text = "unknown authentication method"; send_ldap_result( conn, op, rc, NULL, text, NULL, NULL ); #ifdef NEW_LOGGING LDAP_LOG( OPERATION, INFO, "do_bind: conn %ld v%d unknown authentication method (%ld)\n", conn->c_connid, version, method ); #else Debug( LDAP_DEBUG_TRACE, "do_bind: v%d unknown authentication method (%ld)\n", version, method, 0 ); #endif 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 ( (be = select_backend( &ndn, 0, 0 )) == NULL ) { if ( default_referral ) { BerVarray ref = referral_rewrite( default_referral, NULL, &pdn, LDAP_SCOPE_DEFAULT ); send_ldap_result( conn, op, rc = LDAP_REFERRAL, NULL, NULL, ref ? ref : default_referral, NULL ); ber_bvarray_free( ref ); } else { /* noSuchObject is not allowed to be returned by bind */ send_ldap_result( conn, op, rc = LDAP_INVALID_CREDENTIALS, NULL, NULL, NULL, NULL ); } goto cleanup; } /* check restrictions */ rc = backend_check_restrictions( be, conn, op, NULL, &text ); if( rc != LDAP_SUCCESS ) { send_ldap_result( conn, op, rc, NULL, text, NULL, NULL ); goto cleanup; } #if defined( LDAP_SLAPI ) slapi_x_backend_set_pb( pb, be ); slapi_x_connection_set_pb( pb, conn ); slapi_x_operation_set_pb( pb, op ); slapi_pblock_set( pb, SLAPI_BIND_TARGET, (void *)dn.bv_val ); slapi_pblock_set( pb, SLAPI_BIND_METHOD, (void *)method ); slapi_pblock_set( pb, SLAPI_BIND_CREDENTIALS, (void *)&cred ); slapi_pblock_set( pb, SLAPI_MANAGEDSAIT, (void *)(0) ); rc = doPluginFNs( be, SLAPI_PLUGIN_PRE_BIND_FN, pb ); if ( rc != SLAPI_BIND_SUCCESS ) { /* * Binding is a special case for SLAPI plugins. It is * possible for a bind plugin to be successful *and* * abort further processing; this means it has handled * a bind request authoritatively. If we have reached * here, a result has been sent to the client (XXX * need to check with Sun whether SLAPI_BIND_ANONYMOUS * means a result has been sent). */ int ldapRc; if ( slapi_pblock_get( pb, SLAPI_RESULT_CODE, (void *)&ldapRc ) != 0 ) ldapRc = LDAP_OTHER; edn.bv_val = NULL; edn.bv_len = 0; if ( rc != SLAPI_BIND_FAIL && ldapRc == LDAP_SUCCESS ) { /* Set the new connection DN. */ if ( rc != SLAPI_BIND_ANONYMOUS ) { slapi_pblock_get( pb, SLAPI_CONN_DN, (void *)&edn.bv_val ); } rc = dnPrettyNormal( NULL, &edn, &pdn, &ndn ); ldap_pvt_thread_mutex_lock( &conn->c_mutex ); conn->c_dn = pdn; conn->c_ndn = ndn; pdn.bv_val = NULL; pdn.bv_len = 0; ndn.bv_val = NULL; ndn.bv_len = 0; if ( conn->c_dn.bv_len != 0 ) { ber_len_t max = sockbuf_max_incoming_auth; ber_sockbuf_ctrl( conn->c_sb, LBER_SB_OPT_SET_MAX_INCOMING, &max ); } /* log authorization identity */ Statslog( LDAP_DEBUG_STATS, "conn=%lu op=%lu BIND dn=\"%s\" mech=simple (SLAPI) ssf=0\n", op->o_connid, op->o_opid, conn->c_dn.bv_val, 0, 0 ); ldap_pvt_thread_mutex_unlock( &conn->c_mutex ); } #ifdef NEW_LOGGING LDAP_LOG( OPERATION, INFO, "do_bind: Bind preoperation plugin returned %d\n", rc, 0, 0); #else Debug(LDAP_DEBUG_TRACE, "do_bind: Bind preoperation plugin returned %d.\n", rc, 0, 0); #endif rc = ldapRc; goto cleanup; } #endif /* defined( LDAP_SLAPI ) */ if ( be->be_bind ) { int ret; ret = (*be->be_bind)( be, conn, op, &pdn, &ndn, method, &cred, &edn ); if ( ret == 0 ) { ldap_pvt_thread_mutex_lock( &conn->c_mutex ); if( conn->c_authz_backend == NULL ) { conn->c_authz_backend = be; } if(edn.bv_len) { conn->c_dn = edn; } else { conn->c_dn = pdn; pdn.bv_val = NULL; pdn.bv_len = 0; } conn->c_ndn = ndn; ndn.bv_val = NULL; ndn.bv_len = 0; if( conn->c_dn.bv_len != 0 ) { ber_len_t max = sockbuf_max_incoming_auth; ber_sockbuf_ctrl( conn->c_sb, LBER_SB_OPT_SET_MAX_INCOMING, &max ); } /* log authorization identity */ Statslog( LDAP_DEBUG_STATS, "conn=%lu op=%lu BIND dn=\"%s\" mech=simple ssf=0\n", op->o_connid, op->o_opid, conn->c_dn.bv_val, conn->c_authmech.bv_val, 0 ); #ifdef NEW_LOGGING LDAP_LOG( OPERATION, DETAIL1, "do_bind: v%d bind: \"%s\" to \"%s\" \n", version, conn->c_dn.bv_val, conn->c_dn.bv_val ); #else Debug( LDAP_DEBUG_TRACE, "do_bind: v%d bind: \"%s\" to \"%s\"\n", version, dn.bv_val, conn->c_dn.bv_val ); #endif ldap_pvt_thread_mutex_unlock( &conn->c_mutex ); /* send this here to avoid a race condition */ send_ldap_result( conn, op, LDAP_SUCCESS, NULL, NULL, NULL, NULL ); } else if (edn.bv_val != NULL) { free( edn.bv_val ); } } else { send_ldap_result( conn, op, rc = LDAP_UNWILLING_TO_PERFORM, NULL, "operation not supported within namingContext", NULL, NULL ); } #if defined( LDAP_SLAPI ) if ( doPluginFNs( be, SLAPI_PLUGIN_POST_BIND_FN, pb ) != 0 ) { #ifdef NEW_LOGGING LDAP_LOG( OPERATION, INFO, "do_bind: Bind postoperation plugins failed\n", 0, 0, 0); #else Debug(LDAP_DEBUG_TRACE, "do_bind: Bind postoperation plugins failed.\n", 0, 0, 0); #endif } #endif /* defined( LDAP_SLAPI ) */ cleanup: conn->c_sasl_bindop = NULL; if( pdn.bv_val != NULL ) { free( pdn.bv_val ); } if( ndn.bv_val != NULL ) { free( ndn.bv_val ); } if ( mech.bv_val != NULL ) { free( mech.bv_val ); } return rc; }