gbak -user sysdba -pass ДругойПароль -b xnet://security.db файл.fbk

 gbak -user sysdba -c файл.fbk security.db

WI-V3.0.4.33054 Firebird 3.0
WI-V3.0.4.33054 Firebird 3.0/XNet (ТестовыйХост)/P14
WI-V3.0.4.33054 Firebird 3.0/XNet (ТестовыйХост)/P14
Database: 'xnet://security.db',  User: OWNER 
SQL> show database;
Database: xnet://security.db
        Owner: SYSDBA
PAGE_SIZE 8192
Number of DB pages allocated = 212
Number of DB pages used = 206
Number of DB pages free = 6
Sweep interval = 0
Forced Writes are OFF
Transaction - oldest = 26
Transaction - oldest active = 27
Transaction - oldest snapshot = 27
Transaction - Next = 8
ODS = 12.0
Database not encrypted
Default Character set: NONE
Linger: 60 seconds

#WireCrypt = Enabled (for client) / Required (for server)
#AuthServer = Srp
#UserManager = Srp

  AuthServer = Srp, Legacy_Auth
  UserManager = Srp, Legacy_UserManager
  WireCrypt = Enabled

SQL> show table plg$srp;
PLG$USER_NAME                   (SEC$USER_NAME) VARCHAR(31) CHARACTER SET UNICODE_FSS Not Null
PLG$VERIFIER                    VARCHAR(128) CHARACTER SET OCTETS Not Null
PLG$SALT                        VARCHAR(32) CHARACTER SET OCTETS Not Null
PLG$COMMENT                     (RDB$DESCRIPTION) BLOB segment 80, subtype TEXT CHARACTER SET UNICODE_FSS Nullable
PLG$FIRST                       (SEC$NAME_PART) VARCHAR(32) CHARACTER SET UNICODE_FSS Nullable
PLG$MIDDLE                      (SEC$NAME_PART) VARCHAR(32) CHARACTER SET UNICODE_FSS Nullable
PLG$LAST                        (SEC$NAME_PART) VARCHAR(32) CHARACTER SET UNICODE_FSS Nullable
PLG$ATTRIBUTES                  (RDB$DESCRIPTION) BLOB segment 80, subtype TEXT CHARACTER SET UNICODE_FSS Nullable
PLG$ACTIVE                      BOOLEAN Nullable
CONSTRAINT INTEG_5:
  Primary key (PLG$USER_NAME)
SQL> show table plg$users;
PLG$USER_NAME                   (SEC$USER_NAME) VARCHAR(31) CHARACTER SET UNICODE_FSS Not Null
PLG$GROUP_NAME                  (SEC$USER_NAME) VARCHAR(31) CHARACTER SET UNICODE_FSS Nullable
PLG$UID                         (PLG$ID) INTEGER Nullable
PLG$GID                         (PLG$ID) INTEGER Nullable
PLG$PASSWD                      (PLG$PASSWD) VARCHAR(64) CHARACTER SET OCTETS Not Null
PLG$COMMENT                     (RDB$DESCRIPTION) BLOB segment 80, subtype TEXT CHARACTER SET UNICODE_FSS Nullable
PLG$FIRST_NAME                  (SEC$NAME_PART) VARCHAR(32) CHARACTER SET UNICODE_FSS Nullable
PLG$MIDDLE_NAME                 (SEC$NAME_PART) VARCHAR(32) CHARACTER SET UNICODE_FSS Nullable
PLG$LAST_NAME                   (SEC$NAME_PART) VARCHAR(32) CHARACTER SET UNICODE_FSS Nullable
CONSTRAINT INTEG_2:
  Primary key (PLG$USER_NAME)
SQL> select 'PLG$SRP' "Plugin", plg$user_name "Login" from plg$srp
CON> union all
CON> select 'PLG$USERS', plg$user_name from plg$users
CON> order by 1, 2;

Plugin    Login
========= ===============================
PLG$SRP   SYSDBA
PLG$USERS SYSDBA
PLG$USERS TEST

SQL> drop user test;commit;
Statement failed, SQLSTATE = HY000
record not found for user: TEST
SQL> drop user test using plugin Legacy_UserManager;commit;
SQL>

ISQL Version: WI-V3.0.5.33212 Firebird 3.0 HQbird
SQL> connect 'xnet://security.db' user test password 'Test';
Server version:
WI-V3.0.5.33212 Firebird 3.0 HQbird
WI-V3.0.5.33212 Firebird 3.0 HQbird/XNet (BASID)/P14
WI-V3.0.5.33212 Firebird 3.0 HQbird/XNet (BASID)/P14
Database: 'xnet://security.db', User: TEST
SQL> select plg$user_name "Login" from plg$srp;
Statement failed, SQLSTATE = 28000
no permission for SELECT access to TABLE PLG$SRP
SQL> connect 'xnet://security.db' user sysdba password 'SYSDBA';
Commit current transaction (y/n)?y
Committing.
Server version:
WI-V3.0.5.33212 Firebird 3.0 HQbird
WI-V3.0.5.33212 Firebird 3.0 HQbird/XNet (BASID)/P14
WI-V3.0.5.33212 Firebird 3.0 HQbird/XNet (BASID)/P14
Database: 'xnet://security.db', User: SYSDBA
SQL> select plg$user_name "Login" from plg$srp;
Login
===============================
SYSDBA
OWNER
WORKER

SQL> select plg$user_name "Login" from plg$users;
Login
===============================
SYSDBA
OWNER
WORKER
TEST