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postgresql/doc/TODO.detail/privileges
Bruce Momjian 3bcf19dc84 Another add.
2001-05-09 23:17:23 +00:00

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From pgsql-hackers-owner@postgresql.org Thu Apr 19 15:15:30 2001
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Date: Thu, 19 Apr 2001 17:58:12 +0200 (CEST)
From: Peter Eisentraut <peter_e@gmx.net>
To: PostgreSQL Development <pgsql-hackers@postgresql.org>
Subject: System catalog representation of access privileges
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Oldtimers might recall the last thread about enhancements of the access
privilege system. See
http://www.postgresql.org/mhonarc/pgsql-hackers/2000-05/msg01220.html
to catch up.
It was more or less agreed that privilege descriptors should be split out
into a separate table for better flexibility and ease of processing. The
dispute was that the old proposal wanted to store only one privilege per
row. I have devised something more efficient:
pg_privilege (
priobj oid, -- oid of table, column, function, etc.
prigrantor oid, -- user who granted the privilege
prigrantee oid, -- user who owns the privilege
priselect char, -- specific privileges follow...
prihierarchy char,
priinsert char,
priupdate char,
pridelete char,
prireferences char,
priunder char,
pritrigger char,
prirule char
/* obvious extension mechanism... */
)
The various "char" fields would be NULL for not granted, some character
for granted, and some other character for granted with grant option (a
poor man's enum, if you will). Votes on the particular characters are
being taken. ;-) Since NULLs are stored specially, sparse pg_privilege
rows wouldn't take extra space.
"Usage" privileges on types and other non-table objects could probably be
lumped under "priselect" (purely for internal purposes).
For access we define system caches on these indexes:
index ( priobj, prigrantee, priselect )
index ( priobj, prigrantee, prihierarchy )
index ( priobj, prigrantee, priinsert )
index ( priobj, prigrantee, priupdate )
index ( priobj, prigrantee, pridelete )
These are the privileges you usually need quickly during query processing,
the others are only needed during table creation. These indexes are not
unique (more than one grantor can grant the same privilege), but AFAICS
the syscache interface should work okay with this, since in normal
operation we don't care who granted the privilege, only whether you have
at least one.
How does that look?
--
Peter Eisentraut peter_e@gmx.net http://funkturm.homeip.net/~peter
From pgsql-hackers-owner+M7738@postgresql.org Thu Apr 19 16:28:19 2001
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From: "Ross J. Reedstrom" <reedstrm@rice.edu>
To: Peter Eisentraut <peter_e@gmx.net>
cc: PostgreSQL Development <pgsql-hackers@postgresql.org>
Subject: Re: [HACKERS] System catalog representation of access privileges
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So, this will remove the relacl field from pg_class, making pg_class
a fixed tuple-length table: that might actually speed access: there
are shortcircuits in place to speed pointer math when this is true.
The implementation looks fine to me, as well. How are group privileges
going to be handled with this system?
Ross
On Thu, Apr 19, 2001 at 05:58:12PM +0200, Peter Eisentraut wrote:
> Oldtimers might recall the last thread about enhancements of the access
> privilege system. See
>
> http://www.postgresql.org/mhonarc/pgsql-hackers/2000-05/msg01220.html
>
> to catch up.
>
> It was more or less agreed that privilege descriptors should be split out
> into a separate table for better flexibility and ease of processing. The
> dispute was that the old proposal wanted to store only one privilege per
> row. I have devised something more efficient:
>
> pg_privilege (
<snip>
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Date: Thu, 19 Apr 2001 16:17:52 -0400
From: Mike Mascari <mascarm@mascari.com>
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Subject: Re: [HACKERS] System catalog representation of access privileges
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Peter Eisentraut wrote:
> I have devised something more efficient:
>
> pg_privilege (
> priobj oid, -- oid of table, column, etc.
> prigrantor oid, -- user who granted the privilege
> prigrantee oid, -- user who owns the privilege
>
> priselect char, -- specific privileges follow...
> prihierarchy char,
> priinsert char,
> priupdate char,
> pridelete char,
> prireferences char,
> priunder char,
> pritrigger char,
> prirule char
> /* obvious extension mechanism... */
> )
>
> "Usage" privileges on types and other non-table objects could probably be
> lumped under "priselect" (purely for internal purposes).
>
That looks quite nice. I do have 3 quick questions though. First, I
assume that the prigrantee could also be a group id? Or would this
system table represent the effective privileges granted to user via
groups? Second, one nice feature of Oracle is the ability to GRANT roles
(our groups) to other roles. So I could do:
CREATE ROLE clerk;
GRANT SELECT on mascarm.deposits TO clerk;
GRANT UPDATE (mascarm.deposits.amount) ON mascarm.deposits TO clerk;
CREATE ROLE banker;
GRANT clerk TO banker;
Would any part of your design prohibit such functionality in the future?
Finally, I'm wondering if "Usage" or "System" privileges should be
another system table. For example, one day I would like to (as in
Oracle):
GRANT SELECT ANY TABLE TO foo WITH ADMIN;
GRANT CREATE PUBLIC SYNONYM TO foo;
GRANT DROP ANY TABLE TO foo;
Presumably, in your design, the above would be represented by 3 records
with something like the following values:
This would be a "SELECT ANY TABLE" privilege (w/Admin):
NULL, grantor_oid, grantee_oid, 'S', NULL, NULL, NULL, NULL, ...
This would be a "CREATE PUBLIC SYNONYM" privilege:
NULL, grantor_oid, grantee_oid, 'c', NULL, NULL, NULL, NULL, ...
That means that the system would need an index as:
index ( prigrantee, priselect )
While I'm not arguing it won't work, it just doesn't "seem" clean to
shoe-horn the system privileges into the same table as the object
privileges.
I've been wrong before though :-)
Mike Mascari
mascarm@mascari.com
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From pgsql-hackers-owner+M7740@postgresql.org Thu Apr 19 17:17:08 2001
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Date: Thu, 19 Apr 2001 23:24:51 +0200 (CEST)
From: Peter Eisentraut <peter_e@gmx.net>
To: Mike Mascari <mascarm@mascari.com>
cc: PostgreSQL Development <pgsql-hackers@postgresql.org>
Subject: Re: [HACKERS] System catalog representation of access privileges
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Mike Mascari writes:
> That looks quite nice. I do have 3 quick questions though. First, I
> assume that the prigrantee could also be a group id?
Yes. It was also suggested making two different grantee columns for users
and groups, but I'm not yet convinced of that. It's an option though.
> Second, one nice feature of Oracle is the ability to GRANT roles
> (our groups) to other roles.
Roles are not part of this deal, although I agree that they would be nice
to have eventually. I'm not sure yet whether role grants would get a
different system table, but I'm leaning there.
> Would any part of your design prohibit such functionality in the future?
Not that I can see.
> Finally, I'm wondering if "Usage" or "System" privileges should be
> another system table. For example, one day I would like to (as in
> Oracle):
>
> GRANT SELECT ANY TABLE TO foo WITH ADMIN;
ANY TABLE probably implies "any table in this schema/database", no? In
that case the grant record would refer to the oid of the schema/database.
Is there any use distinguishing between ANY TABLE and ANY VIEW? That
would make it a bit trickier.
> GRANT CREATE PUBLIC SYNONYM TO foo;
I'm not familiar with that above command.
> GRANT DROP ANY TABLE TO foo;
I'm not sold on a DROP privilege, but a CREATE privilege would be another
column. I didn't include it here because it's not in SQL.
> While I'm not arguing it won't work, it just doesn't "seem" clean to
> shoe-horn the system privileges into the same table as the object
> privileges.
It would make sense to split privileges on tables from privileges on
schemas/databases from privileges on, say, functions, etc. E.g.,
pg_privtable -- like proposed
pg_privschema (
priobj oid, prigrantor oid, prigrantee oid,
char pritarget, -- 't' = any table, 'v' = any view, ...
char priselect,
char priupdate,
/* etc */
)
But this would mean that a check like "can I select from this table"
would possibly require lookups in two tables. Not sure how much of a
tradeoff that is, but the "shoehorn factor" would be lower.
Comments on this?
--
Peter Eisentraut peter_e@gmx.net http://funkturm.homeip.net/~peter
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From pgsql-hackers-owner+M7741@postgresql.org Thu Apr 19 18:12:56 2001
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To: Peter Eisentraut <peter_e@gmx.net>
cc: PostgreSQL Development <pgsql-hackers@postgresql.org>
Subject: Re: [HACKERS] System catalog representation of access privileges
In-Reply-To: <Pine.LNX.4.30.0104182009040.762-100000@peter.localdomain>
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Comments: In-reply-to Peter Eisentraut <peter_e@gmx.net>
message dated "Thu, 19 Apr 2001 17:58:12 +0200"
Date: Thu, 19 Apr 2001 17:53:26 -0400
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From: Tom Lane <tgl@sss.pgh.pa.us>
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Peter Eisentraut <peter_e@gmx.net> writes:
> pg_privilege (
> priobj oid, -- oid of table, column, function, etc.
> prigrantor oid, -- user who granted the privilege
> prigrantee oid, -- user who owns the privilege
What about groups? What about wildcards? We already allow
"grant <priv> to PUBLIC (all)", and it would be nice to be able to do
something like "grant <on everything I own> to joeblow"
> Since NULLs are stored specially, sparse pg_privilege
> rows wouldn't take extra space.
Unless there get to be a very large number of privilege bits, it'd
probably be better to handle these columns as NOT NULL, so that a fixed
C struct record could be mapped onto the tuples. You'll notice that
most of the other system tables are done that way.
Alternatively, since you really only need two bits per privilege,
perhaps a pair of BIT (VARYING?) fields would be a more effective
approach. BIT VARYING would have the nice property that adding a new
privilege type doesn't force initdb.
> For access we define system caches on these indexes:
> index ( priobj, prigrantee, priselect )
> index ( priobj, prigrantee, prihierarchy )
> index ( priobj, prigrantee, priinsert )
> index ( priobj, prigrantee, priupdate )
> index ( priobj, prigrantee, pridelete )
Using the privilege bits as part of the index won't work if you intend
to allow them to be null. Another objection is that this would end up
caching multiple copies of the same tuple. A third is that you can't
readily tell lack of an entry (implying you should use a default ACL
setting, which might allow the access) from presence of an entry denying
the access. A fourth is it doesn't work for groups or wildcards.
> These indexes are not
> unique (more than one grantor can grant the same privilege), but AFAICS
> the syscache interface should work okay with this,
Unfortunately not. The syscache stuff needs unique indexes, because it
can only return one tuple for any given request.
I don't really believe this indexing scheme is workable. Need to think
some more. Possibly the syscache mechanism will not do, and we need a
specially indexed privilege cache instead.
regards, tom lane
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From pgsql-hackers-owner+M7743@postgresql.org Thu Apr 19 18:47:11 2001
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From: Mike Mascari <mascarm@mascari.com>
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To: Peter Eisentraut <peter_e@gmx.net>
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Subject: Re: [HACKERS] System catalog representation of access privileges
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First, let me say that just because Oracle does it this way doesn't make
it better but...
Oracle divides privileges into 2 categories:
Object privileges
System privileges
The Object privileges are the ones you describe. And I agree
fundamentally with your design. Although I would have (a) used a bitmask
for the privileges and (b) have an additional bitmask which determines
whether or not the Grantee could turn around and grant the same
permission to someone else:
pg_objprivs {
priobj oid,
prigrantor oid,
prigrantee oid,
priprivileges int4,
priadmin int4
};
Where priprivileges is a bitmask for:
0 ALTER - tables, sequences
1 DELETE - tables, views
2 EXECUTE - procedures, functions
3 INDEX - tables
4 INSERT - tables, views
5 REFERENCES - tables
6 SELECT - tables, views, sequences
7 UPDATE - tables, views
8 HIERARCHY - tables
9 UNDER - tables
And the priadmin is a bitmask to determine whether or not the Grantee
could grant the same privilege to another user. Since these are Object
privileges, 32 bits should be enough (and also 640K RAM ;-)).
The System privileges are privileges granted to a user or role (a.k.a
group) which are not associated with any particular object. This is one
area where I think PostgreSQL needs a lot of work and thought,
particularly with schemas coming down the road. Some example Oracle
System privileges are:
Typical User Privileges:
-----------------------
CREATE SESSION - Allows the user to connect
CREATE SEQUENCE - Allows the user to create sequences in his schema
CREATE SYNONYM - Allows the user to create private synonyms
CREATE TABLE - Allows the user to create a table in his schema
CREATE TRIGGER - Allows the user to create triggers on tables in his
schema
CREATE VIEW - Allows the user to create views in his schema
Typical Power-User Privileges:
-----------------------------
ALTER ANY INDEX - Allows user to alter an index in *any* schema
ALTER ANY PROCEDURE - Allows user to alter a procedure in *any* schema
ALTER ANY TABLE - Allows user to alter a table in *any* schema
...
CREATE ANY TABLE - Allows user to create a table in *any* schema
COMMENT ANY TABLE - Allows user to document any table in *any* schema
...
Typical DBA-Only Privileges:
---------------------------
ALTER USER - Allows user to change password, quotas, etc. for *any* user
CREATE USER - Allows user to create a new user
DROP USER - Allows user to drop a new user
GRANT ANY PRIVILEGE - Allows user to grant any privilege to any user
ANALYZE ANY - Allows user to analyze any table in *any* schema
There are, in fact, many, many more System Privileges that Oracle
defines. You may want someone to connect to a database and query one
table and that's it. Or you may want someone to have no other abilities
except to document the database design via the great COMMENT ON command
;-), etc.
So for System Privileges, I would have something like:
pg_sysprivs {
prigrantee oid,
priprivilege oid,
prigroup bool,
priadmin bool
};
So each System privilege granted to a user (or group) would be its own
record. The priprivilege would be the OID of one of the many System
privileges defined in the same way types are defined, if prigroup is
false. If prigroup is true, however, then priprivilege is not a System
privilege, but a group id. And then PostgreSQL will have to examine the
privileges recursively for that group. Of course, you might not want to
allow for the GRANTing of group privileges to other groups initially,
which simplifies the implementation tremendously. But its a neat (if not
complicated) Oracle-ism.
Unfortunately, this means that the permission might require > 2 lookups.
But these lookups are only if the previous lookup failed:
SELECT * FROM employees.foo;
1. Am I a member of the employees schema? Yes -> Done
2. Have I been GRANTed the Object Privilege of:
SELECT on employees.foo? Yes -> Done
3. Have I been GRANTed the System Privilege of:
SELECT ANY TABLE? Yes -> Done
So the number of lookups does potentially increase, but only for those
users that have been granted access through greater and greater layers
of authority.
I just think that each new feature added to PostgreSQL opens up a very
large can of worms. Schemas are such a feature and the security system
should be prepared for it.
FWIW,
Mike Mascari
mascarm@mascari.com
Peter Eisentraut wrote:
>
>
> It would make sense to split privileges on tables from privileges on
> schemas/databases from privileges on, say, functions, etc. E.g.,
>
> pg_privtable -- like proposed
>
> pg_privschema (
> priobj oid, prigrantor oid, prigrantee oid,
> char pritarget, -- 't' = any table, 'v' = any view, ...
> char priselect,
> char priupdate,
> /* etc */
> )
>
> But this would mean that a check like "can I select from this table"
> would possibly require lookups in two tables. Not sure how much of a
> tradeoff that is, but the "shoehorn factor" would be lower.
>
> Comments on this?
>
> --
> Peter Eisentraut peter_e@gmx.net http://funkturm.homeip.net/~peter
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Date: Fri, 20 Apr 2001 17:31:16 +0200 (CEST)
From: Peter Eisentraut <peter_e@gmx.net>
To: Tom Lane <tgl@sss.pgh.pa.us>
cc: PostgreSQL Development <pgsql-hackers@postgresql.org>
Subject: Re: [HACKERS] System catalog representation of access privileges
In-Reply-To: <22759.987717206@sss.pgh.pa.us>
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Tom Lane writes:
> Peter Eisentraut <peter_e@gmx.net> writes:
> > pg_privilege (
> > priobj oid, -- oid of table, column, function, etc.
> > prigrantor oid, -- user who granted the privilege
> > prigrantee oid, -- user who owns the privilege
>
> What about groups?
Either integrated into prigrantee or another column prigroupgrantee. One
of these would always be zero or null, that's why I'm not sure if this
isn't a waste of space.
> What about wildcards? We already allow
> "grant <priv> to PUBLIC (all)", and it would be nice to be able to do
> something like "grant <on everything I own> to joeblow"
Public would be prigrantee == 0. About <everything I own>, how is this
defined? If it is "everything I own and will ever own" then I suppose
priobj == 0. Although I admit I have never seen this kind of privilege
before. It's probably better to set up a group for that.
> Alternatively, since you really only need two bits per privilege,
> perhaps a pair of BIT (VARYING?) fields would be a more effective
> approach. BIT VARYING would have the nice property that adding a new
> privilege type doesn't force initdb.
This would be tricky to index, I think.
> I don't really believe this indexing scheme is workable. Need to think
> some more. Possibly the syscache mechanism will not do, and we need a
> specially indexed privilege cache instead.
Maybe just an index on (object, grantee) and walk through that with an
index scan. This is done in some other places as well (triggers, I
recall), but the performance is probably not too exciting.
However, last I looked at the syscache I figured that it would be
perfectly capable of handling non-unique indexes if there only was an API
to retrieve those values. Storing and finding the entries didn't seem to
be the problem. Need to look there, probably.
--
Peter Eisentraut peter_e@gmx.net http://funkturm.homeip.net/~peter
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To: Peter Eisentraut <peter_e@gmx.net>
cc: PostgreSQL Development <pgsql-hackers@postgresql.org>
Subject: Re: [HACKERS] System catalog representation of access privileges
In-Reply-To: <Pine.LNX.4.30.0104201717010.758-100000@peter.localdomain>
References: <Pine.LNX.4.30.0104201717010.758-100000@peter.localdomain>
Comments: In-reply-to Peter Eisentraut <peter_e@gmx.net>
message dated "Fri, 20 Apr 2001 17:31:16 +0200"
Date: Fri, 20 Apr 2001 12:35:46 -0400
Message-ID: <26834.987784546@sss.pgh.pa.us>
From: Tom Lane <tgl@sss.pgh.pa.us>
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Peter Eisentraut <peter_e@gmx.net> writes:
>> Alternatively, since you really only need two bits per privilege,
>> perhaps a pair of BIT (VARYING?) fields would be a more effective
>> approach. BIT VARYING would have the nice property that adding a new
>> privilege type doesn't force initdb.
> This would be tricky to index, I think.
True, but I don't believe that making the privilege value part of the
index is useful.
> Maybe just an index on (object, grantee) and walk through that with an
> index scan. This is done in some other places as well (triggers, I
> recall), but the performance is probably not too exciting.
I agree, that'd be slower than we'd like. It needs to be cached somehow.
The major problem is that you'd need multiple index scans: after failing
to find anything for (table, currentuser) you'd also need to try
(table, 0) for PUBLIC and (table, G) for every group G that contains the
current user. Not to mention the scan to find out which groups those are.
It gets rapidly worse if you want to allow any wildcarding on the object
--- for example, if a privilege record attached to a schema can allow
access to the tables therein, which I think should be possible. You'd
have to repeat the above for each possible priobject that might relate
to the target object.
I think this might be tolerable for getting the info in the first place,
but the final results really need to be cached. That's why I was
wondering about a special "privilege cache".
> However, last I looked at the syscache I figured that it would be
> perfectly capable of handling non-unique indexes if there only was an API
> to retrieve those values.
Yes, it's an API problem more than anything else. Invent away, if that
seems like a needed component.
regards, tom lane
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From pgsql-hackers-owner+M4091@postgresql.org Mon Jan 29 17:00:26 2001
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Date: Mon, 29 Jan 2001 23:37:08 +0100 (CET)
From: Karel Zak <zakkr@zf.jcu.cz>
To: =?koi8-r?B?7cHL08nNIO0uIPDPzNHLz9c=?= <max@bresttelecom.by>
cc: pgsql-hackers <pgsql-hackers@postgresql.org>
Subject: [HACKERS] NOCREATETABLE patch (was: Re: Please, help!(about Postgres))
In-Reply-To: <005d01c08772$de689030$1e01a8c0@bresttelecom>
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Status: ORr
On Fri, 26 Jan 2001, [koi8-r] <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD> <20>. <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> wrote:
> Good Day, Dear Karel Zak!
>
> Please, forgive me for my bad english and if i do not right with your
> day time.
my English is more poor :-)
You are right, it is (was?) in TODO and it will implemented - I hope -
in some next release (may be in 7.2 during ACL overhaul, Peter?).
Before some time I wrote patch that resolve it for 7.0.2 (anyone -
I forgot his name..) port it to 7.0.2, my original patch was for 7.0.0.
May be will possible use it for last stable 7.0.3 too.
The patch is at:
ftp://ftp2.zf.jcu.cz/users/zakkr/pg/7.0.2-user.patch.gz
This patch add to 7.0.2 code NOCREATETABLE and NOLOCKTABLE feature:
CREATE USER username
[ WITH
[ SYSID uid ]
[ PASSWORD 'password' ] ]
[ CREATEDB | NOCREATEDB ] [ CREATEUSER | NOCREATEUSER ]
-> [ CREATETABLE | NOCREATETABLE ] [ LOCKTABLE | NOLOCKTABLE ]
...etc.
If CREATETABLE or LOCKTABLE is not specific in CREATE USER command,
as default is set CREATETABLE or LOCKTABLE (true).
But, don't forget - it's temporarily solution, I hope that some next
release resolve it more systematic. More is in the patche@postgresql.org
archive where was send original patch.
Because you are not first person that ask me, I re-post (CC:) it to
hackers@postgresql.org, more admins happy with this :-)
Karel
> I want to ask You about "access control over who can create tables and
> use locks in PostgreSQL". This message was placed in PostgreSQL site
> TODO list. But now it was deleted. I so need help about this question,
> becouse i'll making a site witch will give hosting for our users.
> And i want to make a PostgreSQL access to their own databases. But there
> is (how You now) one problem. Anyone user may to connect to the different
> user database and he may to create himself tables.
> I don't like it.
From mascarm@mascari.com Mon May 7 15:57:48 2001
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From: Mike Mascari <mascarm@mascari.com>
Reply-To: "mascarm@mascari.com" <mascarm@mascari.com>
To: "'Bruce Momjian'" <pgman@candle.pha.pa.us>, Karel Zak <zakkr@zf.jcu.cz>
cc: pgsql-hackers <pgsql-hackers@postgresql.org>
Subject: RE: [HACKERS] NOCREATETABLE patch (was: Re: Please, help!(about Postgres))
Date: Mon, 7 May 2001 15:55:52 -0400
Organization: Mascari Development Inc.
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Status: OR
Peter E. posted his proposal for the revamping of the
authentication/security system a few weeks ago. There was a
discussion, but I don't know if he came to any definitive
conclusions, such as implementing System Privileges as well as Object
Privileges. If he does, then the dba (or anyone who has been granted
GRANT ANY PRIVILEGE system privilege & CREATE USER system privilege)
should be able to do:
CREATE USER mascarm IDENTIFIED BY manager;
GRANT CREATE TABLE to mascarm;
It would also be good if PostgreSQL came with 2 groups by default -
connect and dba.
The connect group would be granted these System Privileges:
CREATE AGGREGATE privilege
CREATE INDEX privilege
CREATE FUNCTION privilege
CREATE OPERATOR privilege
CREATE RULE privilege
CREATE SESSION privilege
CREATE SYNONYM privilege
CREATE TABLE privilege
CREATE TRIGGER privilege
CREATE TYPE privilege
CREATE VIEW privilege
These allow the user to create the above objects in their own schema
only. We're getting schemas in 7.2, right? ;-).
The dba group would be granted the rest, like these:
CREATE ANY AGGREGATE privilege
CREATE ANY INDEX privilege...
(and so on)
as well as:
CREATE/ALTER/DROP USER
GRANT ANY PRIVILEGE
COMMENT ANY TABLE
INSERT ANY TABLE
UPDATE ANY TABLE
DELETE ANY TABLE
SELECT ANY TABLE
ANALYZE ANY TABLE
LOCK ANY TABLE
CREATE PUBLIC SYNONYM (needed when schemas roll around)
DROP PUBLIC SYNONYM
(and so on)
Then, the dba could do a:
GRANT connect TO mascarm;
Or a:
CREATE USER mascarm
IDENTIFIED BY manager
IN GROUP connect;
It seems Karel's patch is a solution to the problem of people who
want to create separate PostgreSQL user accounts, but want to ensure
that a user can't create tables. In Oracle, I would just do a:
CREATE USER mascarm
IDENTIFIED BY manager;
GRANT CREATE SESSION TO mascarm;
Now mascarm has the ability to connect, but that's it.
Currently, if I know for instance that a background process DROPS a
table, CREATES a new one, and then imports some data, I can create my
own table by the same name, in between the DROP and CREATE and can
cause havoc (if its not done in a single transaction). Hopefully
Peter E's ACL design will allow for Oracle-like System Privileges to
take place. That would allow for a much finer granularity of
permissions then everyone either being the Unix equivalent of 'root'
or 'user'.
Just my humble opinion though,
Mike Mascari
mascarm@mascari.com
-----Original Message-----
From: Bruce Momjian [SMTP:pgman@candle.pha.pa.us]
Can someone remind me what we are going to do with this?
[ Charset ISO-8859-2 unsupported, converting... ]
>
> On Fri, 26 Jan 2001, [koi8-r] ______ _. _______ wrote:
>
> > Good Day, Dear Karel Zak!
> >
> > Please, forgive me for my bad english and if i do not right with
your
> > day time.
>
> my English is more poor :-)
>
> You are right, it is (was?) in TODO and it will implemented - I
hope -
> in some next release (may be in 7.2 during ACL overhaul, Peter?).
>
> Before some time I wrote patch that resolve it for 7.0.2 (anyone -
> I forgot his name..) port it to 7.0.2, my original patch was for
7.0.0.
> May be will possible use it for last stable 7.0.3 too.
>
> The patch is at:
> ftp://ftp2.zf.jcu.cz/users/zakkr/pg/7.0.2-user.patch.gz
>
> This patch add to 7.0.2 code NOCREATETABLE and NOLOCKTABLE feature:
>
> CREATE USER username
> [ WITH
> [ SYSID uid ]
> [ PASSWORD 'password' ] ]
> [ CREATEDB | NOCREATEDB ] [ CREATEUSER | NOCREATEUSER ]
> -> [ CREATETABLE | NOCREATETABLE ] [ LOCKTABLE | NOLOCKTABLE ]
> ...etc.
>
> If CREATETABLE or LOCKTABLE is not specific in CREATE USER
command,
> as default is set CREATETABLE or LOCKTABLE (true).
>
>
> But, don't forget - it's temporarily solution, I hope that some
next
> release resolve it more systematic. More is in the
patche@postgresql.org
> archive where was send original patch.
>
> Because you are not first person that ask me, I re-post (CC:) it
to
> hackers@postgresql.org, more admins happy with this :-)
>
> Karel
>
> > I want to ask You about "access control over who can create
tables and
> > use locks in PostgreSQL". This message was placed in PostgreSQL
site
> > TODO list. But now it was deleted. I so need help about this
question,
> > becouse i'll making a site witch will give hosting for our users.
> > And i want to make a PostgreSQL access to their own databases.
But there
> > is (how You now) one problem. Anyone user may to connect to the
different
> > user database and he may to create himself tables.
> > I don't like it.
>
>
>
--
Bruce Momjian | http://candle.pha.pa.us
pgman@candle.pha.pa.us | (610) 853-3000
+ If your life is a hard drive, | 830 Blythe Avenue
+ Christ can be your backup. | Drexel Hill, Pennsylvania
19026
From tgl@sss.pgh.pa.us Mon May 7 17:33:41 2001
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To: Bruce Momjian <pgman@candle.pha.pa.us>
cc: Karel Zak <zakkr@zf.jcu.cz>,
=?KOI8-R?Q?=ED=C1=CB=D3=C9=CD_=ED=2E_=F0=CF=CC=D1=CB=CF=D7?= <max@bresttelecom.by>,
pgsql-hackers <pgsql-hackers@postgresql.org>
Subject: Re: [HACKERS] NOCREATETABLE patch (was: Re: Please, help!(about Postgres))
In-Reply-To: <200105071848.f47ImBh20345@candle.pha.pa.us>
References: <200105071848.f47ImBh20345@candle.pha.pa.us>
Comments: In-reply-to Bruce Momjian <pgman@candle.pha.pa.us>
message dated "Mon, 07 May 2001 14:48:11 -0400"
Date: Mon, 07 May 2001 17:33:42 -0400
Message-ID: <23233.989271222@sss.pgh.pa.us>
From: Tom Lane <tgl@sss.pgh.pa.us>
Status: OR
Bruce Momjian <pgman@candle.pha.pa.us> writes:
> Can someone remind me what we are going to do with this?
I'd like to see some effort put into implementing the SQL-standard
privilege model, rather than adding yet more ad-hoc user properties.
The more of these we make, the more painful it's going to be to meet
the spec later.
Possibly, after we have the SQL semantics we'll still feel that we
need some additional features ... but how about spec first and
extensions afterwards?
regards, tom lane
From zakkr@zf.jcu.cz Wed May 9 05:12:41 2001
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Date: Wed, 9 May 2001 11:12:35 +0200
From: Karel Zak <zakkr@zf.jcu.cz>
To: Bruce Momjian <pgman@candle.pha.pa.us>
cc: pgsql-hackers <pgsql-hackers@postgresql.org>
Subject: Re: [HACKERS] NOCREATETABLE patch (was: Re: Please, help!(about Postgres))
Message-ID: <20010509111235.A18101@ara.zf.jcu.cz>
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In-Reply-To: <200105071848.f47ImBh20345@candle.pha.pa.us>; from pgman@candle.pha.pa.us on Mon, May 07, 2001 at 02:48:11PM -0400
Status: ORr
On Mon, May 07, 2001 at 02:48:11PM -0400, Bruce Momjian wrote:
>
> Can someone remind me what we are going to do with this?
>
> > This patch add to 7.0.2 code NOCREATETABLE and NOLOCKTABLE feature:
It's my old patch, it's usable and some people use it for 7.0.x. But
it's really temporary solution and it was 1 day in official CVS :-)
We remove it after discussion with Peter E. More correct will implement
better privilege system.
A privilege system is *very* important for real multiuser and
sophisticated systems. For example if you compare PostgreSQL with Oracle,
the PostgreSQL is really not winner in this part. Peter has some idea
about it and Jan sent something about it too, but I not sure if somebody
works on this and plannig it for some next release (or...? -- will good
if I not right:-)
Karel
From pgsql-hackers-owner+M8485@postgresql.org Wed May 9 10:11:53 2001
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From: Mike Mascari <mascarm@mascari.com>
Reply-To: "mascarm@mascari.com" <mascarm@mascari.com>
To: "'Zeugswetter Andreas SB'" <ZeugswetterA@wien.spardat.at>,
"'Bruce Momjian'"
<pgman@candle.pha.pa.us>
cc: Karel Zak <zakkr@zf.jcu.cz>,
pgsql-hackers
<pgsql-hackers@postgresql.org>
Subject: RE: [HACKERS] NOCREATETABLE patch (was: Re: Please, help!(about P ostgres))
Date: Wed, 9 May 2001 09:29:01 -0400
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Status: OR
That makes perfect sense to me. I was only going by what System
Privileges are granted to the Oracle roles of the same name. Oracle
has:
CONNECT -
ALTER SESSION
CREATE CLUSTER
CREATE DATABASE LINK
CREATE SEQUENCE
CREATE SESSION
CREATE SYNONYM
CREATE TABLE
CREATE VIEW
RESOURCE -
CREATE CLUSTER
CREATE PROCEDURE
CREATE SEQUENCE
CREATE TABLE
CREATE TRIGGER
DBA -
All systems privileges WITH ADMIN OPTION
But I agree with you. When I was first learning Oracle, I thought it
strange that the CONNECT role had anything more than CREATE/ALTER
SESSION privilege.
Mike Mascari
mascarm@mascari.com
-----Original Message-----
From: Zeugswetter Andreas SB [SMTP:ZeugswetterA@wien.spardat.at]
Sent: Wednesday, May 09, 2001 3:20 AM
To: 'Bruce Momjian'; mascarm@mascari.com
Cc: Karel Zak; pgsql-hackers
Subject: AW: [HACKERS] NOCREATETABLE patch (was: Re: Please,
help!(about P ostgres))
> > The connect group would be granted these System Privileges:
If we keep it like others (e.g. Informix) this System Privilege would
be called
"resource". I like this name better, because it more describes the
detailed
priviledges.
> >
> > CREATE AGGREGATE privilege
> > CREATE INDEX privilege
> > CREATE FUNCTION privilege
> > CREATE OPERATOR privilege
> > CREATE RULE privilege
> > CREATE SESSION privilege
> > CREATE SYNONYM privilege
> > CREATE TABLE privilege
> > CREATE TRIGGER privilege
> > CREATE TYPE privilege
> > CREATE VIEW privilege
The "connect" group would only have the priviledge to connect to the
db [and
create temp tables ?] and rights they where granted, or that were
granted to public.
They would not be allowed to create anything.
Andreas
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From ZeugswetterA@wien.spardat.at Wed May 9 03:21:37 2001
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From: Zeugswetter Andreas SB <ZeugswetterA@wien.spardat.at>
To: "'Bruce Momjian'" <pgman@candle.pha.pa.us>, mascarm@mascari.com
cc: Karel Zak <zakkr@zf.jcu.cz>,
pgsql-hackers
<pgsql-hackers@postgresql.org>
Subject: AW: [HACKERS] NOCREATETABLE patch (was: Re: Please, help!(about P
ostgres))
Date: Wed, 9 May 2001 09:20:28 +0200
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> > The connect group would be granted these System Privileges:
If we keep it like others (e.g. Informix) this System Privilege would be called
"resource". I like this name better, because it more describes the detailed
priviledges.
> >
> > CREATE AGGREGATE privilege
> > CREATE INDEX privilege
> > CREATE FUNCTION privilege
> > CREATE OPERATOR privilege
> > CREATE RULE privilege
> > CREATE SESSION privilege
> > CREATE SYNONYM privilege
> > CREATE TABLE privilege
> > CREATE TRIGGER privilege
> > CREATE TYPE privilege
> > CREATE VIEW privilege
The "connect" group would only have the priviledge to connect to the db [and
create temp tables ?] and rights they where granted, or that were granted to public.
They would not be allowed to create anything.
Andreas
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