/* $NetBSD: passwd.c,v 1.1.1.6.6.1 2019/08/10 06:17:17 martin Exp $ */ /* passwd.c - password extended operation routines */ /* $OpenLDAP$ */ /* This work is part of OpenLDAP Software . * * Copyright 1998-2019 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 * . */ #include __RCSID("$NetBSD: passwd.c,v 1.1.1.6.6.1 2019/08/10 06:17:17 martin Exp $"); #include "portable.h" #include #include #include #include #ifdef SLAPD_CRYPT #include #endif #include "slap.h" #include #include #include const struct berval slap_EXOP_MODIFY_PASSWD = BER_BVC(LDAP_EXOP_MODIFY_PASSWD); static const char *defhash[] = { #ifdef LUTIL_SHA1_BYTES "{SSHA}", #else "{SMD5}", #endif NULL }; int passwd_extop( Operation *op, SlapReply *rs ) { struct berval id = {0, NULL}, hash, *rsp = NULL; req_pwdexop_s *qpw = &op->oq_pwdexop; req_extended_s qext = op->oq_extended; Modifications *ml; slap_callback cb = { NULL, slap_null_cb, NULL, NULL }; int i, nhash; char **hashes, idNul; int rc; BackendDB *op_be; int freenewpw = 0; struct berval dn = BER_BVNULL, ndn = BER_BVNULL; assert( ber_bvcmp( &slap_EXOP_MODIFY_PASSWD, &op->ore_reqoid ) == 0 ); if( op->o_dn.bv_len == 0 ) { Statslog( LDAP_DEBUG_STATS, "%s PASSMOD\n", op->o_log_prefix, 0, 0, 0, 0 ); rs->sr_text = "only authenticated users may change passwords"; return LDAP_STRONG_AUTH_REQUIRED; } qpw->rs_old.bv_len = 0; qpw->rs_old.bv_val = NULL; qpw->rs_new.bv_len = 0; qpw->rs_new.bv_val = NULL; qpw->rs_mods = NULL; qpw->rs_modtail = NULL; rs->sr_err = slap_passwd_parse( op->ore_reqdata, &id, &qpw->rs_old, &qpw->rs_new, &rs->sr_text ); if ( !BER_BVISNULL( &id )) { idNul = id.bv_val[id.bv_len]; id.bv_val[id.bv_len] = '\0'; } if ( rs->sr_err == LDAP_SUCCESS && !BER_BVISEMPTY( &id ) ) { Statslog( LDAP_DEBUG_STATS, "%s PASSMOD id=\"%s\"%s%s\n", op->o_log_prefix, id.bv_val, qpw->rs_old.bv_val ? " old" : "", qpw->rs_new.bv_val ? " new" : "", 0 ); } else { Statslog( LDAP_DEBUG_STATS, "%s PASSMOD%s%s\n", op->o_log_prefix, qpw->rs_old.bv_val ? " old" : "", qpw->rs_new.bv_val ? " new" : "", 0, 0 ); } if ( rs->sr_err != LDAP_SUCCESS ) { if ( !BER_BVISNULL( &id )) id.bv_val[id.bv_len] = idNul; return rs->sr_err; } if ( !BER_BVISEMPTY( &id ) ) { rs->sr_err = dnPrettyNormal( NULL, &id, &dn, &ndn, op->o_tmpmemctx ); id.bv_val[id.bv_len] = idNul; if ( rs->sr_err != LDAP_SUCCESS ) { rs->sr_text = "Invalid DN"; rc = rs->sr_err; goto error_return; } op->o_req_dn = dn; op->o_req_ndn = ndn; op->o_bd = select_backend( &op->o_req_ndn, 1 ); } else { ber_dupbv_x( &dn, &op->o_dn, op->o_tmpmemctx ); ber_dupbv_x( &ndn, &op->o_ndn, op->o_tmpmemctx ); op->o_req_dn = dn; op->o_req_ndn = ndn; ldap_pvt_thread_mutex_lock( &op->o_conn->c_mutex ); op->o_bd = op->o_conn->c_authz_backend; ldap_pvt_thread_mutex_unlock( &op->o_conn->c_mutex ); } if( op->o_bd == NULL ) { if ( qpw->rs_old.bv_val != NULL ) { rs->sr_text = "unwilling to verify old password"; rc = LDAP_UNWILLING_TO_PERFORM; goto error_return; } #ifdef HAVE_CYRUS_SASL rc = slap_sasl_setpass( op, rs ); #else rs->sr_text = "no authz backend"; rc = LDAP_OTHER; #endif goto error_return; } if ( op->o_req_ndn.bv_len == 0 ) { rs->sr_text = "no password is associated with the Root DSE"; rc = LDAP_UNWILLING_TO_PERFORM; goto error_return; } /* If we've got a glued backend, check the real backend */ op_be = op->o_bd; if ( SLAP_GLUE_INSTANCE( op->o_bd )) { op->o_bd = select_backend( &op->o_req_ndn, 0 ); } if (backend_check_restrictions( op, rs, (struct berval *)&slap_EXOP_MODIFY_PASSWD ) != LDAP_SUCCESS) { rc = rs->sr_err; goto error_return; } /* check for referrals */ if ( backend_check_referrals( op, rs ) != LDAP_SUCCESS ) { rc = rs->sr_err; goto error_return; } /* This does not apply to multi-master case */ if(!( !SLAP_SINGLE_SHADOW( op->o_bd ) || be_isupdate( op ))) { /* we SHOULD return a referral in this case */ BerVarray defref = op->o_bd->be_update_refs ? op->o_bd->be_update_refs : default_referral; if( defref != NULL ) { rs->sr_ref = referral_rewrite( op->o_bd->be_update_refs, NULL, NULL, LDAP_SCOPE_DEFAULT ); if(rs->sr_ref) { rs->sr_flags |= REP_REF_MUSTBEFREED; } else { rs->sr_ref = defref; } rc = LDAP_REFERRAL; goto error_return; } rs->sr_text = "shadow context; no update referral"; rc = LDAP_UNWILLING_TO_PERFORM; goto error_return; } /* generate a new password if none was provided */ if ( qpw->rs_new.bv_len == 0 ) { slap_passwd_generate( &qpw->rs_new ); if ( qpw->rs_new.bv_len ) { rsp = slap_passwd_return( &qpw->rs_new ); freenewpw = 1; } } if ( qpw->rs_new.bv_len == 0 ) { rs->sr_text = "password generation failed"; rc = LDAP_OTHER; goto error_return; } op->o_bd = op_be; /* Give the backend a chance to handle this itself */ if ( op->o_bd->be_extended ) { rs->sr_err = op->o_bd->be_extended( op, rs ); if ( rs->sr_err != LDAP_UNWILLING_TO_PERFORM && rs->sr_err != SLAP_CB_CONTINUE ) { rc = rs->sr_err; if ( rsp ) { rs->sr_rspdata = rsp; rsp = NULL; } goto error_return; } } /* The backend didn't handle it, so try it here */ if( op->o_bd && !op->o_bd->be_modify ) { rs->sr_text = "operation not supported for current user"; rc = LDAP_UNWILLING_TO_PERFORM; goto error_return; } if ( qpw->rs_old.bv_val != NULL ) { Entry *e = NULL; rc = be_entry_get_rw( op, &op->o_req_ndn, NULL, slap_schema.si_ad_userPassword, 0, &e ); if ( rc == LDAP_SUCCESS && e ) { Attribute *a = attr_find( e->e_attrs, slap_schema.si_ad_userPassword ); if ( a ) rc = slap_passwd_check( op, e, a, &qpw->rs_old, &rs->sr_text ); else rc = 1; be_entry_release_r( op, e ); if ( rc == LDAP_SUCCESS ) goto old_good; } rs->sr_text = "unwilling to verify old password"; rc = LDAP_UNWILLING_TO_PERFORM; goto error_return; } old_good: ml = ch_malloc( sizeof(Modifications) ); if ( !qpw->rs_modtail ) qpw->rs_modtail = &ml->sml_next; if ( default_passwd_hash ) { for ( nhash = 0; default_passwd_hash[nhash]; nhash++ ); hashes = default_passwd_hash; } else { nhash = 1; hashes = (char **)defhash; } ml->sml_numvals = nhash; ml->sml_values = ch_malloc( (nhash+1)*sizeof(struct berval) ); for ( i=0; hashes[i]; i++ ) { slap_passwd_hash_type( &qpw->rs_new, &hash, hashes[i], &rs->sr_text ); if ( hash.bv_len == 0 ) { if ( !rs->sr_text ) { rs->sr_text = "password hash failed"; } break; } ml->sml_values[i] = hash; } ml->sml_values[i].bv_val = NULL; ml->sml_nvalues = NULL; ml->sml_desc = slap_schema.si_ad_userPassword; ml->sml_type = ml->sml_desc->ad_cname; ml->sml_op = LDAP_MOD_REPLACE; ml->sml_flags = 0; ml->sml_next = qpw->rs_mods; qpw->rs_mods = ml; if ( hashes[i] ) { rs->sr_err = LDAP_OTHER; } else { slap_callback *sc = op->o_callback; op->o_tag = LDAP_REQ_MODIFY; op->o_callback = &cb; op->orm_modlist = qpw->rs_mods; op->orm_no_opattrs = 0; cb.sc_private = qpw; /* let Modify know this was pwdMod, * if it cares... */ rs->sr_err = op->o_bd->be_modify( op, rs ); /* be_modify() might have shuffled modifications */ qpw->rs_mods = op->orm_modlist; if ( rs->sr_err == LDAP_SUCCESS ) { rs->sr_rspdata = rsp; } else if ( rsp ) { ber_bvfree( rsp ); rsp = NULL; } op->o_tag = LDAP_REQ_EXTENDED; op->o_callback = sc; } rc = rs->sr_err; op->oq_extended = qext; error_return:; if ( qpw->rs_mods ) { slap_mods_free( qpw->rs_mods, 1 ); } if ( freenewpw ) { free( qpw->rs_new.bv_val ); } if ( !BER_BVISNULL( &dn ) ) { op->o_tmpfree( dn.bv_val, op->o_tmpmemctx ); BER_BVZERO( &op->o_req_dn ); } if ( !BER_BVISNULL( &ndn ) ) { op->o_tmpfree( ndn.bv_val, op->o_tmpmemctx ); BER_BVZERO( &op->o_req_ndn ); } return rc; } /* NOTE: The DN in *id is NOT NUL-terminated here. dnNormalize will * reject it in this condition, the caller must NUL-terminate it. * FIXME: should dnNormalize still be complaining about that? */ int slap_passwd_parse( struct berval *reqdata, struct berval *id, struct berval *oldpass, struct berval *newpass, const char **text ) { int rc = LDAP_SUCCESS; ber_tag_t tag; ber_len_t len = -1; BerElementBuffer berbuf; BerElement *ber = (BerElement *)&berbuf; if( reqdata == NULL ) { return LDAP_SUCCESS; } if( reqdata->bv_len == 0 ) { *text = "empty request data field"; return LDAP_PROTOCOL_ERROR; } /* ber_init2 uses reqdata directly, doesn't allocate new buffers */ ber_init2( ber, reqdata, 0 ); tag = ber_skip_tag( ber, &len ); if( tag != LBER_SEQUENCE ) { Debug( LDAP_DEBUG_TRACE, "slap_passwd_parse: decoding error\n", 0, 0, 0 ); rc = LDAP_PROTOCOL_ERROR; goto done; } tag = ber_peek_tag( ber, &len ); if( tag == LDAP_TAG_EXOP_MODIFY_PASSWD_ID ) { if( id == NULL ) { Debug( LDAP_DEBUG_TRACE, "slap_passwd_parse: ID not allowed.\n", 0, 0, 0 ); *text = "user must change own password"; rc = LDAP_UNWILLING_TO_PERFORM; goto done; } tag = ber_get_stringbv( ber, id, LBER_BV_NOTERM ); if( tag == LBER_ERROR ) { Debug( LDAP_DEBUG_TRACE, "slap_passwd_parse: ID parse failed.\n", 0, 0, 0 ); goto decoding_error; } tag = ber_peek_tag( ber, &len ); } if( tag == LDAP_TAG_EXOP_MODIFY_PASSWD_OLD ) { if( oldpass == NULL ) { Debug( LDAP_DEBUG_TRACE, "slap_passwd_parse: OLD not allowed.\n", 0, 0, 0 ); *text = "use bind to verify old password"; rc = LDAP_UNWILLING_TO_PERFORM; goto done; } tag = ber_get_stringbv( ber, oldpass, LBER_BV_NOTERM ); if( tag == LBER_ERROR ) { Debug( LDAP_DEBUG_TRACE, "slap_passwd_parse: OLD parse failed.\n", 0, 0, 0 ); goto decoding_error; } if( oldpass->bv_len == 0 ) { Debug( LDAP_DEBUG_TRACE, "slap_passwd_parse: OLD empty.\n", 0, 0, 0 ); *text = "old password value is empty"; rc = LDAP_UNWILLING_TO_PERFORM; goto done; } tag = ber_peek_tag( ber, &len ); } if( tag == LDAP_TAG_EXOP_MODIFY_PASSWD_NEW ) { if( newpass == NULL ) { Debug( LDAP_DEBUG_TRACE, "slap_passwd_parse: NEW not allowed.\n", 0, 0, 0 ); *text = "user specified passwords disallowed"; rc = LDAP_UNWILLING_TO_PERFORM; goto done; } tag = ber_get_stringbv( ber, newpass, LBER_BV_NOTERM ); if( tag == LBER_ERROR ) { Debug( LDAP_DEBUG_TRACE, "slap_passwd_parse: NEW parse failed.\n", 0, 0, 0 ); goto decoding_error; } if( newpass->bv_len == 0 ) { Debug( LDAP_DEBUG_TRACE, "slap_passwd_parse: NEW empty.\n", 0, 0, 0 ); *text = "new password value is empty"; rc = LDAP_UNWILLING_TO_PERFORM; goto done; } tag = ber_peek_tag( ber, &len ); } if( len != 0 ) { decoding_error: Debug( LDAP_DEBUG_TRACE, "slap_passwd_parse: decoding error, len=%ld\n", (long) len, 0, 0 ); *text = "data decoding error"; rc = LDAP_PROTOCOL_ERROR; } done: return rc; } struct berval * slap_passwd_return( struct berval *cred ) { int rc; struct berval *bv = NULL; BerElementBuffer berbuf; /* opaque structure, size unknown but smaller than berbuf */ BerElement *ber = (BerElement *)&berbuf; assert( cred != NULL ); Debug( LDAP_DEBUG_TRACE, "slap_passwd_return: %ld\n", (long) cred->bv_len, 0, 0 ); ber_init_w_nullc( ber, LBER_USE_DER ); rc = ber_printf( ber, "{tON}", LDAP_TAG_EXOP_MODIFY_PASSWD_GEN, cred ); if( rc >= 0 ) { (void) ber_flatten( ber, &bv ); } ber_free_buf( ber ); return bv; } /* * if "e" is provided, access to each value of the password is checked first */ int slap_passwd_check( Operation *op, Entry *e, Attribute *a, struct berval *cred, const char **text ) { int result = 1; struct berval *bv; AccessControlState acl_state = ACL_STATE_INIT; char credNul = cred->bv_val[cred->bv_len]; #ifdef SLAPD_SPASSWD void *old_authctx = NULL; ldap_pvt_thread_pool_setkey( op->o_threadctx, (void *)slap_sasl_bind, op->o_conn->c_sasl_authctx, 0, &old_authctx, NULL ); #endif if ( credNul ) cred->bv_val[cred->bv_len] = 0; for ( bv = a->a_vals; bv->bv_val != NULL; bv++ ) { /* if e is provided, check access */ if ( e && access_allowed( op, e, a->a_desc, bv, ACL_AUTH, &acl_state ) == 0 ) { continue; } if ( !lutil_passwd( bv, cred, NULL, text ) ) { result = 0; break; } } if ( credNul ) cred->bv_val[cred->bv_len] = credNul; #ifdef SLAPD_SPASSWD ldap_pvt_thread_pool_setkey( op->o_threadctx, (void *)slap_sasl_bind, old_authctx, 0, NULL, NULL ); #endif return result; } void slap_passwd_generate( struct berval *pass ) { Debug( LDAP_DEBUG_TRACE, "slap_passwd_generate\n", 0, 0, 0 ); BER_BVZERO( pass ); /* * generate passwords of only 8 characters as some getpass(3) * implementations truncate at 8 characters. */ lutil_passwd_generate( pass, 8 ); } void slap_passwd_hash_type( struct berval * cred, struct berval * new, char *hash, const char **text ) { new->bv_len = 0; new->bv_val = NULL; assert( hash != NULL ); lutil_passwd_hash( cred , hash, new, text ); } void slap_passwd_hash( struct berval * cred, struct berval * new, const char **text ) { char *hash = NULL; if ( default_passwd_hash ) { hash = default_passwd_hash[0]; } if ( !hash ) { hash = (char *)defhash[0]; } slap_passwd_hash_type( cred, new, hash, text ); } #ifdef SLAPD_CRYPT static ldap_pvt_thread_mutex_t passwd_mutex; static lutil_cryptfunc slapd_crypt; static int slapd_crypt( const char *key, const char *salt, char **hash ) { char *cr; int rc; ldap_pvt_thread_mutex_lock( &passwd_mutex ); cr = crypt( key, salt ); if ( cr == NULL || cr[0] == '\0' ) { /* salt must have been invalid */ rc = LUTIL_PASSWD_ERR; } else { if ( hash ) { *hash = ber_strdup( cr ); rc = LUTIL_PASSWD_OK; } else { rc = strcmp( salt, cr ) ? LUTIL_PASSWD_ERR : LUTIL_PASSWD_OK; } } ldap_pvt_thread_mutex_unlock( &passwd_mutex ); return rc; } #endif /* SLAPD_CRYPT */ void slap_passwd_init() { #ifdef SLAPD_CRYPT ldap_pvt_thread_mutex_init( &passwd_mutex ); lutil_cryptptr = slapd_crypt; #endif }