Обсуждение: Permission denied on schema for all users on insert to table with fk

On 07/25/2018 06:40 AM, Leland Weathers wrote:

I just ran into an issue on 9.5.13 after creating a new schema with a set of tables in them, that no accounts (including schema / table owners) can insert into a table with a fk relation. A snippet of the error output in log files is as follows and looks like it is permissions related to the parent table:____

Is the FK to a table in another schema?

Can we see the schema definitions for the affected tables?

Here are the two tables schema as well as their permissions:

system=# \d results.historyitem

                                                Table "results.historyitem"

     Column     |            Type             |                                 Modifiers

----------------+-----------------------------+----------------------------------------------------------------------------

id             | integer                     | not null default nextval(('results."historyitem_id_seq"'::text)::regclass)

batchid        | integer                     | not null

datasourceid   | integer                     |

sequence_order | integer                     | not null

description    | text                        |

causedfailure  | boolean                     |

timestamp      | timestamp without time zone |

modulename     | text                        |

modulebasename | text                        |

Indexes:

    "pk_historyitem_id" PRIMARY KEY, btree (id)

    "ixfk_historyitem_batch" btree (batchid)

Foreign-key constraints:

    "fk_historyitem_batch" FOREIGN KEY (batchid) REFERENCES results.batch(id) ON DELETE CASCADE

 

 

system=# \d results.batch

                                                  Table "results.batch"

        Column        |            Type             |                              Modifiers

----------------------+-----------------------------+----------------------------------------------------------------------

id                   | integer                     | not null default nextval(('results."batch_id_seq"'::text)::regclass)

hostname             | character varying(255)      |

assemblyversion      | character varying(255)      |

commandlinearguments | text                        |

starttime            | timestamp without time zone |

endtime              | timestamp without time zone |

exitcode             | integer                     |

windowsidentity      | character varying(255)      |

threadcount          | integer                     |

Indexes:

    "pk_batch_id" PRIMARY KEY, btree (id)

Referenced by:

    TABLE "results.historyitem" CONSTRAINT "fk_historyitem_batch" FOREIGN KEY (batchid) REFERENCES results.batch(id) ON DELETE CASCADE

    TABLE "results.result" CONSTRAINT "fk_result_batch" FOREIGN KEY (batchid) REFERENCES results.batch(id) ON DELETE CASCADE

 

 

system=# \dp results.batch

                                       Access privileges                                      

 Schema  | Name  | Type  |          Access privileges           | Column privileges | Policies

---------+-------+-------+--------------------------------------+-------------------+----------

results | batch | table | system_admin=arwdDxt/system_admin   +|                   |

         |       |       | system_reader=r/system_admin        +|                   |

         |       |       | system_batch_writer=arw/system_admin+|                   |

         |       |       | gb=arwdDxt/system_admin             +|                   |

         |       |       | jb=arwdDxt/system_admin              |                   |

(1 row)

 

 

system=# \dp results.historyitem

                                          Access privileges                                         

 Schema  |    Name     | Type  |           Access privileges          | Column privileges | Policies

---------+-------------+-------+--------------------------------------+-------------------+----------

results | historyitem | table | system_admin=arwdDxt/system_admin   +|                   |

         |             |       | system_reader=r/system_admin        +|                   |

         |             |       | system_batch_writer=arw/system_admin+|                   |

         |             |       | gb=arwdDxt/system_admin             +|                   |

         |             |       | jb=arwdDxt/system_admin              |                   |

(1 row)

 

 

system=#

 

 

And a more complete example of what we are seeing with multiple accounts. This particular set is from an account that has their role set to that of the database & schema owner which is different than the table owner role.

 

system=# insert into results.batch (hostname, assemblyversion) VALUES ('mycomp','0.0.0000.00000');

INSERT 0 1

system=# select lastval();

lastval

---------

       6

(1 row)

 

 

system=# INSERT INTO results.historyitem (batchid,datasourceid,sequence_order)

system-# VALUES

system-# (6,20,1);

ERROR:  permission denied for schema results

LINE 1: SELECT 1 FROM ONLY "results"."batch"...

                           ^

QUERY:  SELECT 1 FROM ONLY "results"."batch" x WHERE "id" OPERATOR(pg_catalog.=) $1 FOR KEY SHARE OF x

system=# SELECT FROM results.batch WHERE id=6;

--

(1 row)

system#

__ __

“permission denied for schema <schemaname>",,,"SELECT 1 FROM ONLY <schemaname>.<tablename> x WHERE ""id"" OPERATOR(pg_catalog.=) $1 FOR KEY SHARE OF x",20____

__ __

__ __

The schema and tables are all owned by the same group role, and members of the owner role are also getting the error. So far, all users both owner and non-owner have been able to successfully execute the select statement used by trigger and get either a 1 back, or no rows when the correct id is entered. When run from the application, writes to this table are immediately after writes to the parent table so that the id can be returned for the child table writes. Writes to both parent/child tables are occurring with the same account. The following short snippet are a couple of the commands run by an account which is in the group role owning the database, schema and tables in question:____

__ __

<database>=# SELECT 1 FROM ONLY "<schema>"."<table>" x WHERE "id" OPERATOR(pg_catalog.=) 3 FOR____

KEY SHARE OF x;____

?column?____

----------____

         1____

(1 row)____

__ __

<database>=# INSERT INTO <schema>.sentryhistoryitem____

<database>-#   (batchid,datasourceid,sequence_order,description,causedfailure,"timestamp",modulename,modulebasename)____

<database>-# VALUES____

<database>-#   (3,20,1,'Found datasource [Id: 20, Name: ds1].',False,'07/24/2018 03:05:58.668','Datasource','Object')____

<database>-# ;____

ERROR:  permission denied for schema <schema>____

LINE 1: SELECT 1 FROM ONLY "<schema>"."<table>"...____

                            ^____

QUERY:  SELECT 1 FROM ONLY "<schema>"."<table>" x WHERE "id" OPERATOR(pg_catalog.=) $1 FOR KEY SHARE OF x____

__ __

I’ve spent a bit of time searching on different sites trying to find pointers to this particular case and haven’t found any good ideas yet for next steps on troubleshooting or pointing at root cause. Any pointers to next steps would be appreciated.

--
Adrian Klaver
adrian.klaver@aklaver.com

On 07/26/2018 03:52 AM, Leland Weathers wrote:

    And a more complete example of what we are seeing with multiple
    accounts. This particular set is from an account that has their role
    set to that of the database & schema owner which is different than
    the table owner role.

    __

    __ __

    system=# insert into results.batch (hostname, assemblyversion)
    VALUES ('mycomp','0.0.0000.00000');____

    INSERT 0 1____

    system=# select lastval();____

    lastval____

    ---------____

            6____

    (1 row)____

    __ __

    __ __

    system=# INSERT INTO results.historyitem
    (batchid,datasourceid,sequence_order)____

    system-# VALUES____

    system-# (6,20,1);____

    ERROR:  permission denied for schema results____

    LINE 1: SELECT 1 FROM ONLY "results"."batch"...____

                                ^____

    QUERY:  SELECT 1 FROM ONLY "results"."batch" x WHERE "id"
    OPERATOR(pg_catalog.=) $1 FOR KEY SHARE OF x____

    system=# SELECT FROM results.batch WHERE id=6;

    --

    (1 row)

What does \dn+ results show?

Before you mentioned a trigger. I am not seeing that in the schema you sent. Is there one and if so what is it's definition and that of its associated function?

What does show?:

select session_user, current_user;

INSERT INTO results.historyitem (batchid,datasourceid,sequence_order) VALUES (6,20,1);


--
Adrian Klaver
adrian.klaver@aklaver.com

On 07/26/2018 06:57 AM, Leland Weathers wrote:

    Before you mentioned a trigger. I am not seeing that in the schema
    you sent. Is there one and if so what is it's definition and that of
    its associated function?


I was referring to the "built-in" PostgreSQL system trigger for validating fk constraints are met. The trigger that uses the "SELECT 1 FROM ONLY..." query. That particular query which the logs say I don't have permissions to execute is not part of my schema/code.


    What does show?:

    select session_user, current_user;


For this particular example, the session_user is: lw, current_user is dba (database and schema owner role)

So if I am following neither of these roles have permissions on the tables. Is that correct?

If you try the INSERT as system_admin, jb or gb does it work?

    INSERT INTO results.historyitem
    (batchid,datasourceid,sequence_order) VALUES (6,20,1);


    --     Adrian Klaver
    adrian.klaver@aklaver.com <mailto:adrian.klaver@aklaver.com>

--
Adrian Klaver
adrian.klaver@aklaver.com