[PATCH] Reworks for Access Control facilities (r2251)

The attached patch reworks access control facilities in PostgreSQL.

The current implementation does not have well separation in what
to be controled and how to be controled. For example, when we create
a new table, it requires users ACL_CREATE on the namespace and
ACL_CREATE on the tablespace if necessary. These checks are methods
to control whether he can create a new table, or not.

This patch provides an abstraction layer of access controls to
separate what to be controlsed and how to be controled.
The abstraction layer is a set of functions to implement what
to be controled.
For example, ac_relation_create() checks user's privilege to
create a new table. It internally calls pg_namespace_aclcheck()
and pg_tablespace_aclcheck() to make its access control decision
based on the security model in database ACLs.

This abstraction layer functions have the following naming convension.

  ac_<object type>_<action>(args, ...)

e.g)  void ac_proc_execute(Oid proOid, Oid roleOid)
        It checks privilege to execute a certain procedure with
        the given database role. The caller gives all the necessary
        informations to make its decision.

It replaces all the pg_xxx_aclcheck() and pg_xxx_ownercheck() invocations
from the backend implementations, except for security/access_control.c.
In this patch, these are used as helper functions to implement access
control logic (in other word, how to be controled), invoked from the
access control functions.

These ac_xxx_xxx() routines will be entrypoints to invoke additional
security checks (SE-PostgreSQL), rather than sepgsqlXXXX() hooks around
the backend implementation.

Thanks,

[kaigai@saba pgsec]$ diffstat sepgsql-01-base-8.5devel-r2251.patch.gz
 backend/Makefile                  |    2
 backend/catalog/aclchk.c          |  218 !
 backend/catalog/namespace.c       |   53
 backend/catalog/pg_aggregate.c    |   12
 backend/catalog/pg_conversion.c   |   33
 backend/catalog/pg_operator.c     |   42
 backend/catalog/pg_proc.c         |   15
 backend/catalog/pg_shdepend.c     |    8
 backend/catalog/pg_type.c         |   25
 backend/commands/aggregatecmds.c  |   42
 backend/commands/alter.c          |   66
 backend/commands/analyze.c        |    5
 backend/commands/cluster.c        |    9
 backend/commands/comment.c        |  120
 backend/commands/conversioncmds.c |   71
 backend/commands/copy.c           |   40
 backend/commands/dbcommands.c     |  160 !
 backend/commands/foreigncmds.c    |  144
 backend/commands/functioncmds.c   |  123
 backend/commands/indexcmds.c      |  120
 backend/commands/lockcmds.c       |   17
 backend/commands/opclasscmds.c    |  223 !
 backend/commands/operatorcmds.c   |   70
 backend/commands/proclang.c       |   56
 backend/commands/schemacmds.c     |   60
 backend/commands/sequence.c       |   38
 backend/commands/tablecmds.c      |  427 -!
 backend/commands/tablespace.c     |   46
 backend/commands/trigger.c        |   41
 backend/commands/tsearchcmds.c    |  176 !
 backend/commands/typecmds.c       |  136 !
 backend/commands/vacuum.c         |    3
 backend/commands/view.c           |    7
 backend/executor/execMain.c       |  203 !
 backend/executor/execQual.c       |   16
 backend/executor/nodeAgg.c        |   24
 backend/executor/nodeMergejoin.c  |    8
 backend/executor/nodeWindowAgg.c  |   24
 backend/optimizer/util/clauses.c  |    6
 backend/parser/parse_utilcmd.c    |   13
 backend/rewrite/rewriteDefine.c   |   10
 backend/rewrite/rewriteRemove.c   |    6
 backend/security/Makefile         |   10
 backend/security/access_control.c | 4290 ++++++++++++++++++++++++++++++++++++++
 backend/tcop/fastpath.c           |   15
 backend/tcop/utility.c            |   74
 backend/utils/adt/dbsize.c        |   25
 backend/utils/adt/ri_triggers.c   |   24
 backend/utils/adt/tid.c           |   18
 backend/utils/init/postinit.c     |   14
 include/catalog/pg_proc_fn.h      |    1
 include/commands/defrem.h         |    1
 include/utils/security.h          |  337 ++
 53 files changed, 5027 insertions(+), 924 deletions(-), 1776 modifications(!)

--
OSS Platform Development Division, NEC
KaiGai Kohei <kaigai@ak.jp.nec.com>