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Previously tables declared WITH OIDS, including a significant fraction of the catalog tables, stored the oid column not as a normal column, but as part of the tuple header. This special column was not shown by default, which was somewhat odd, as it's often (consider e.g. pg_class.oid) one of the more important parts of a row. Neither pg_dump nor COPY included the contents of the oid column by default. The fact that the oid column was not an ordinary column necessitated a significant amount of special case code to support oid columns. That already was painful for the existing, but upcoming work aiming to make table storage pluggable, would have required expanding and duplicating that "specialness" significantly. WITH OIDS has been deprecated since 2005 (commit ff02d0a05280e0). Remove it. Removing includes: - CREATE TABLE and ALTER TABLE syntax for declaring the table to be WITH OIDS has been removed (WITH (oids[ = true]) will error out) - pg_dump does not support dumping tables declared WITH OIDS and will issue a warning when dumping one (and ignore the oid column). - restoring an pg_dump archive with pg_restore will warn when restoring a table with oid contents (and ignore the oid column) - COPY will refuse to load binary dump that includes oids. - pg_upgrade will error out when encountering tables declared WITH OIDS, they have to be altered to remove the oid column first. - Functionality to access the oid of the last inserted row (like plpgsql's RESULT_OID, spi's SPI_lastoid, ...) has been removed. The syntax for declaring a table WITHOUT OIDS (or WITH (oids = false) for CREATE TABLE) is still supported. While that requires a bit of support code, it seems unnecessary to break applications / dumps that do not use oids, and are explicit about not using them. The biggest user of WITH OID columns was postgres' catalog. This commit changes all 'magic' oid columns to be columns that are normally declared and stored. To reduce unnecessary query breakage all the newly added columns are still named 'oid', even if a table's column naming scheme would indicate 'reloid' or such. This obviously requires adapting a lot code, mostly replacing oid access via HeapTupleGetOid() with access to the underlying Form_pg_*->oid column. The bootstrap process now assigns oids for all oid columns in genbki.pl that do not have an explicit value (starting at the largest oid previously used), only oids assigned later by oids will be above FirstBootstrapObjectId. As the oid column now is a normal column the special bootstrap syntax for oids has been removed. Oids are not automatically assigned during insertion anymore, all backend code explicitly assigns oids with GetNewOidWithIndex(). For the rare case that insertions into the catalog via SQL are called for the new pg_nextoid() function can be used (which only works on catalog tables). The fact that oid columns on system tables are now normal columns means that they will be included in the set of columns expanded by * (i.e. SELECT * FROM pg_class will now include the table's oid, previously it did not). It'd not technically be hard to hide oid column by default, but that'd mean confusing behavior would either have to be carried forward forever, or it'd cause breakage down the line. While it's not unlikely that further adjustments are needed, the scope/invasiveness of the patch makes it worthwhile to get merge this now. It's painful to maintain externally, too complicated to commit after the code code freeze, and a dependency of a number of other patches. Catversion bump, for obvious reasons. Author: Andres Freund, with contributions by John Naylor Discussion: https://postgr.es/m/20180930034810.ywp2c7awz7opzcfr@alap3.anarazel.de
960 lines
24 KiB
C
960 lines
24 KiB
C
/* -------------------------------------------------------------------------
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*
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* contrib/sepgsql/label.c
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*
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* Routines to support SELinux labels (security context)
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*
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* Copyright (c) 2010-2018, PostgreSQL Global Development Group
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*
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* -------------------------------------------------------------------------
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*/
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#include "postgres.h"
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#include <selinux/label.h>
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#include "access/heapam.h"
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#include "access/htup_details.h"
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#include "access/genam.h"
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#include "access/xact.h"
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#include "catalog/catalog.h"
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#include "catalog/dependency.h"
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#include "catalog/indexing.h"
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#include "catalog/pg_attribute.h"
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#include "catalog/pg_class.h"
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#include "catalog/pg_database.h"
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#include "catalog/pg_namespace.h"
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#include "catalog/pg_proc.h"
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#include "commands/dbcommands.h"
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#include "commands/seclabel.h"
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#include "libpq/auth.h"
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#include "libpq/libpq-be.h"
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#include "miscadmin.h"
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#include "utils/builtins.h"
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#include "utils/fmgroids.h"
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#include "utils/guc.h"
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#include "utils/lsyscache.h"
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#include "utils/memutils.h"
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#include "utils/rel.h"
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#include "utils/tqual.h"
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#include "sepgsql.h"
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/*
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* Saved hook entries (if stacked)
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*/
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static ClientAuthentication_hook_type next_client_auth_hook = NULL;
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static needs_fmgr_hook_type next_needs_fmgr_hook = NULL;
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static fmgr_hook_type next_fmgr_hook = NULL;
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/*
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* client_label_*
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*
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* security label of the database client. Initially the client security label
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* is equal to client_label_peer, and can be changed by one or more calls to
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* sepgsql_setcon(), and also be temporarily overridden during execution of a
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* trusted-procedure.
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*
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* sepgsql_setcon() is a transaction-aware operation; a (sub-)transaction
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* rollback should also rollback the current client security label. Therefore
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* we use the list client_label_pending of pending_label to keep track of which
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* labels were set during the (sub-)transactions.
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*/
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static char *client_label_peer = NULL; /* set by getpeercon(3) */
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static List *client_label_pending = NIL; /* pending list being set by
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* sepgsql_setcon() */
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static char *client_label_committed = NULL; /* set by sepgsql_setcon(), and
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* already committed */
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static char *client_label_func = NULL; /* set by trusted procedure */
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typedef struct
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{
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SubTransactionId subid;
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char *label;
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} pending_label;
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/*
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* sepgsql_get_client_label
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*
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* Returns the current security label of the client. All code should use this
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* routine to get the current label, instead of referring to the client_label_*
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* variables above.
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*/
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char *
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sepgsql_get_client_label(void)
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{
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/* trusted procedure client label override */
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if (client_label_func)
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return client_label_func;
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/* uncommitted sepgsql_setcon() value */
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if (client_label_pending)
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{
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pending_label *plabel = llast(client_label_pending);
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if (plabel->label)
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return plabel->label;
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}
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else if (client_label_committed)
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return client_label_committed; /* set by sepgsql_setcon() committed */
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/* default label */
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Assert(client_label_peer != NULL);
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return client_label_peer;
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}
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/*
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* sepgsql_set_client_label
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*
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* This routine tries to switch the current security label of the client, and
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* checks related permissions. The supplied new label shall be added to the
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* client_label_pending list, then saved at transaction-commit time to ensure
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* transaction-awareness.
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*/
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static void
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sepgsql_set_client_label(const char *new_label)
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{
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const char *tcontext;
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MemoryContext oldcxt;
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pending_label *plabel;
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/* Reset to the initial client label, if NULL */
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if (!new_label)
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tcontext = client_label_peer;
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else
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{
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if (security_check_context_raw((security_context_t) new_label) < 0)
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ereport(ERROR,
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(errcode(ERRCODE_INVALID_NAME),
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errmsg("SELinux: invalid security label: \"%s\"",
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new_label)));
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tcontext = new_label;
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}
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/* Check process:{setcurrent} permission. */
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sepgsql_avc_check_perms_label(sepgsql_get_client_label(),
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SEPG_CLASS_PROCESS,
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SEPG_PROCESS__SETCURRENT,
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NULL,
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true);
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/* Check process:{dyntransition} permission. */
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sepgsql_avc_check_perms_label(tcontext,
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SEPG_CLASS_PROCESS,
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SEPG_PROCESS__DYNTRANSITION,
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NULL,
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true);
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/*
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* Append the supplied new_label on the pending list until the current
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* transaction is committed.
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*/
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oldcxt = MemoryContextSwitchTo(CurTransactionContext);
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plabel = palloc0(sizeof(pending_label));
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plabel->subid = GetCurrentSubTransactionId();
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if (new_label)
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plabel->label = pstrdup(new_label);
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client_label_pending = lappend(client_label_pending, plabel);
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MemoryContextSwitchTo(oldcxt);
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}
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/*
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* sepgsql_xact_callback
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*
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* A callback routine of transaction commit/abort/prepare. Commit or abort
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* changes in the client_label_pending list.
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*/
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static void
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sepgsql_xact_callback(XactEvent event, void *arg)
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{
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if (event == XACT_EVENT_COMMIT)
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{
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if (client_label_pending != NIL)
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{
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pending_label *plabel = llast(client_label_pending);
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char *new_label;
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if (plabel->label)
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new_label = MemoryContextStrdup(TopMemoryContext,
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plabel->label);
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else
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new_label = NULL;
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if (client_label_committed)
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pfree(client_label_committed);
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client_label_committed = new_label;
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/*
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* XXX - Note that items of client_label_pending are allocated on
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* CurTransactionContext, thus, all acquired memory region shall
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* be released implicitly.
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*/
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client_label_pending = NIL;
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}
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}
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else if (event == XACT_EVENT_ABORT)
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client_label_pending = NIL;
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}
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/*
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* sepgsql_subxact_callback
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*
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* A callback routine of sub-transaction start/abort/commit. Releases all
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* security labels that are set within the sub-transaction that is aborted.
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*/
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static void
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sepgsql_subxact_callback(SubXactEvent event, SubTransactionId mySubid,
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SubTransactionId parentSubid, void *arg)
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{
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ListCell *cell;
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ListCell *prev;
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ListCell *next;
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if (event == SUBXACT_EVENT_ABORT_SUB)
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{
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prev = NULL;
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for (cell = list_head(client_label_pending); cell; cell = next)
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{
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pending_label *plabel = lfirst(cell);
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next = lnext(cell);
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if (plabel->subid == mySubid)
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client_label_pending
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= list_delete_cell(client_label_pending, cell, prev);
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else
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prev = cell;
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}
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}
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}
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/*
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* sepgsql_client_auth
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*
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* Entrypoint of the client authentication hook.
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* It switches the client label according to getpeercon(), and the current
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* performing mode according to the GUC setting.
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*/
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static void
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sepgsql_client_auth(Port *port, int status)
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{
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if (next_client_auth_hook)
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(*next_client_auth_hook) (port, status);
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/*
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* In the case when authentication failed, the supplied socket shall be
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* closed soon, so we don't need to do anything here.
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*/
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if (status != STATUS_OK)
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return;
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/*
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* Getting security label of the peer process using API of libselinux.
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*/
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if (getpeercon_raw(port->sock, &client_label_peer) < 0)
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ereport(FATAL,
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(errcode(ERRCODE_INTERNAL_ERROR),
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errmsg("SELinux: unable to get peer label: %m")));
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/*
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* Switch the current performing mode from INTERNAL to either DEFAULT or
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* PERMISSIVE.
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*/
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if (sepgsql_get_permissive())
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sepgsql_set_mode(SEPGSQL_MODE_PERMISSIVE);
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else
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sepgsql_set_mode(SEPGSQL_MODE_DEFAULT);
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}
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/*
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* sepgsql_needs_fmgr_hook
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*
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* It informs the core whether the supplied function is trusted procedure,
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* or not. If true, sepgsql_fmgr_hook shall be invoked at start, end, and
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* abort time of function invocation.
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*/
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static bool
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sepgsql_needs_fmgr_hook(Oid functionId)
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{
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ObjectAddress object;
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if (next_needs_fmgr_hook &&
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(*next_needs_fmgr_hook) (functionId))
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return true;
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/*
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* SELinux needs the function to be called via security_definer wrapper,
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* if this invocation will take a domain-transition. We call these
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* functions as trusted-procedure, if the security policy has a rule that
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* switches security label of the client on execution.
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*/
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if (sepgsql_avc_trusted_proc(functionId) != NULL)
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return true;
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/*
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* Even if not a trusted-procedure, this function should not be inlined
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* unless the client has db_procedure:{execute} permission. Please note
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* that it shall be actually failed later because of same reason with
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* ACL_EXECUTE.
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*/
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object.classId = ProcedureRelationId;
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object.objectId = functionId;
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object.objectSubId = 0;
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if (!sepgsql_avc_check_perms(&object,
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SEPG_CLASS_DB_PROCEDURE,
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SEPG_DB_PROCEDURE__EXECUTE |
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SEPG_DB_PROCEDURE__ENTRYPOINT,
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SEPGSQL_AVC_NOAUDIT, false))
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return true;
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return false;
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}
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/*
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* sepgsql_fmgr_hook
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*
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* It switches security label of the client on execution of trusted
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* procedures.
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*/
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static void
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sepgsql_fmgr_hook(FmgrHookEventType event,
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FmgrInfo *flinfo, Datum *private)
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{
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struct
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{
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char *old_label;
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char *new_label;
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Datum next_private;
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} *stack;
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switch (event)
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{
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case FHET_START:
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stack = (void *) DatumGetPointer(*private);
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if (!stack)
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{
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MemoryContext oldcxt;
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oldcxt = MemoryContextSwitchTo(flinfo->fn_mcxt);
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stack = palloc(sizeof(*stack));
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stack->old_label = NULL;
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stack->new_label = sepgsql_avc_trusted_proc(flinfo->fn_oid);
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stack->next_private = 0;
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MemoryContextSwitchTo(oldcxt);
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/*
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* process:transition permission between old and new label,
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* when user tries to switch security label of the client on
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* execution of trusted procedure.
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*
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* Also, db_procedure:entrypoint permission should be checked
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* whether this procedure can perform as an entrypoint of the
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* trusted procedure, or not. Note that db_procedure:execute
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* permission shall be checked individually.
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*/
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if (stack->new_label)
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{
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ObjectAddress object;
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object.classId = ProcedureRelationId;
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object.objectId = flinfo->fn_oid;
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object.objectSubId = 0;
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sepgsql_avc_check_perms(&object,
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SEPG_CLASS_DB_PROCEDURE,
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SEPG_DB_PROCEDURE__ENTRYPOINT,
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getObjectDescription(&object),
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true);
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sepgsql_avc_check_perms_label(stack->new_label,
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SEPG_CLASS_PROCESS,
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SEPG_PROCESS__TRANSITION,
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NULL, true);
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}
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*private = PointerGetDatum(stack);
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}
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Assert(!stack->old_label);
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if (stack->new_label)
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{
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stack->old_label = client_label_func;
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client_label_func = stack->new_label;
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}
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if (next_fmgr_hook)
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(*next_fmgr_hook) (event, flinfo, &stack->next_private);
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break;
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case FHET_END:
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case FHET_ABORT:
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stack = (void *) DatumGetPointer(*private);
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if (next_fmgr_hook)
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(*next_fmgr_hook) (event, flinfo, &stack->next_private);
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if (stack->new_label)
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{
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client_label_func = stack->old_label;
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stack->old_label = NULL;
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}
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break;
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default:
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elog(ERROR, "unexpected event type: %d", (int) event);
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break;
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}
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}
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/*
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* sepgsql_init_client_label
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*
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* Initializes the client security label and sets up related hooks for client
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* label management.
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*/
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void
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sepgsql_init_client_label(void)
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{
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/*
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* Set up dummy client label.
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*
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* XXX - note that PostgreSQL launches background worker process like
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* autovacuum without authentication steps. So, we initialize sepgsql_mode
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* with SEPGSQL_MODE_INTERNAL, and client_label with the security context
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* of server process. Later, it also launches background of user session.
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* In this case, the process is always hooked on post-authentication, and
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* we can initialize the sepgsql_mode and client_label correctly.
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*/
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if (getcon_raw(&client_label_peer) < 0)
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ereport(ERROR,
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(errcode(ERRCODE_INTERNAL_ERROR),
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errmsg("SELinux: failed to get server security label: %m")));
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/* Client authentication hook */
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next_client_auth_hook = ClientAuthentication_hook;
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ClientAuthentication_hook = sepgsql_client_auth;
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/* Trusted procedure hooks */
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next_needs_fmgr_hook = needs_fmgr_hook;
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needs_fmgr_hook = sepgsql_needs_fmgr_hook;
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next_fmgr_hook = fmgr_hook;
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fmgr_hook = sepgsql_fmgr_hook;
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/* Transaction/Sub-transaction callbacks */
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RegisterXactCallback(sepgsql_xact_callback, NULL);
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RegisterSubXactCallback(sepgsql_subxact_callback, NULL);
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}
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/*
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* sepgsql_get_label
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*
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* It returns a security context of the specified database object.
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* If unlabeled or incorrectly labeled, the system "unlabeled" label
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* shall be returned.
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*/
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char *
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sepgsql_get_label(Oid classId, Oid objectId, int32 subId)
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{
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ObjectAddress object;
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char *label;
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object.classId = classId;
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object.objectId = objectId;
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object.objectSubId = subId;
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label = GetSecurityLabel(&object, SEPGSQL_LABEL_TAG);
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if (!label || security_check_context_raw((security_context_t) label))
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{
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security_context_t unlabeled;
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if (security_get_initial_context_raw("unlabeled", &unlabeled) < 0)
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ereport(ERROR,
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(errcode(ERRCODE_INTERNAL_ERROR),
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errmsg("SELinux: failed to get initial security label: %m")));
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PG_TRY();
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{
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label = pstrdup(unlabeled);
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}
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PG_CATCH();
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{
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freecon(unlabeled);
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PG_RE_THROW();
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}
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PG_END_TRY();
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freecon(unlabeled);
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}
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return label;
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}
|
|
|
|
/*
|
|
* sepgsql_object_relabel
|
|
*
|
|
* An entrypoint of SECURITY LABEL statement
|
|
*/
|
|
void
|
|
sepgsql_object_relabel(const ObjectAddress *object, const char *seclabel)
|
|
{
|
|
/*
|
|
* validate format of the supplied security label, if it is security
|
|
* context of selinux.
|
|
*/
|
|
if (seclabel &&
|
|
security_check_context_raw((security_context_t) seclabel) < 0)
|
|
ereport(ERROR,
|
|
(errcode(ERRCODE_INVALID_NAME),
|
|
errmsg("SELinux: invalid security label: \"%s\"", seclabel)));
|
|
|
|
/*
|
|
* Do actual permission checks for each object classes
|
|
*/
|
|
switch (object->classId)
|
|
{
|
|
case DatabaseRelationId:
|
|
sepgsql_database_relabel(object->objectId, seclabel);
|
|
break;
|
|
|
|
case NamespaceRelationId:
|
|
sepgsql_schema_relabel(object->objectId, seclabel);
|
|
break;
|
|
|
|
case RelationRelationId:
|
|
if (object->objectSubId == 0)
|
|
sepgsql_relation_relabel(object->objectId,
|
|
seclabel);
|
|
else
|
|
sepgsql_attribute_relabel(object->objectId,
|
|
object->objectSubId,
|
|
seclabel);
|
|
break;
|
|
|
|
case ProcedureRelationId:
|
|
sepgsql_proc_relabel(object->objectId, seclabel);
|
|
break;
|
|
|
|
default:
|
|
ereport(ERROR,
|
|
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
|
|
errmsg("sepgsql provider does not support labels on %s",
|
|
getObjectTypeDescription(object))));
|
|
break;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* TEXT sepgsql_getcon(VOID)
|
|
*
|
|
* It returns the security label of the client.
|
|
*/
|
|
PG_FUNCTION_INFO_V1(sepgsql_getcon);
|
|
Datum
|
|
sepgsql_getcon(PG_FUNCTION_ARGS)
|
|
{
|
|
char *client_label;
|
|
|
|
if (!sepgsql_is_enabled())
|
|
PG_RETURN_NULL();
|
|
|
|
client_label = sepgsql_get_client_label();
|
|
|
|
PG_RETURN_TEXT_P(cstring_to_text(client_label));
|
|
}
|
|
|
|
/*
|
|
* BOOL sepgsql_setcon(TEXT)
|
|
*
|
|
* It switches the security label of the client.
|
|
*/
|
|
PG_FUNCTION_INFO_V1(sepgsql_setcon);
|
|
Datum
|
|
sepgsql_setcon(PG_FUNCTION_ARGS)
|
|
{
|
|
const char *new_label;
|
|
|
|
if (PG_ARGISNULL(0))
|
|
new_label = NULL;
|
|
else
|
|
new_label = TextDatumGetCString(PG_GETARG_DATUM(0));
|
|
|
|
sepgsql_set_client_label(new_label);
|
|
|
|
PG_RETURN_BOOL(true);
|
|
}
|
|
|
|
/*
|
|
* TEXT sepgsql_mcstrans_in(TEXT)
|
|
*
|
|
* It translate the given qualified MLS/MCS range into raw format
|
|
* when mcstrans daemon is working.
|
|
*/
|
|
PG_FUNCTION_INFO_V1(sepgsql_mcstrans_in);
|
|
Datum
|
|
sepgsql_mcstrans_in(PG_FUNCTION_ARGS)
|
|
{
|
|
text *label = PG_GETARG_TEXT_PP(0);
|
|
char *raw_label;
|
|
char *result;
|
|
|
|
if (!sepgsql_is_enabled())
|
|
ereport(ERROR,
|
|
(errcode(ERRCODE_OBJECT_NOT_IN_PREREQUISITE_STATE),
|
|
errmsg("sepgsql is not enabled")));
|
|
|
|
if (selinux_trans_to_raw_context(text_to_cstring(label),
|
|
&raw_label) < 0)
|
|
ereport(ERROR,
|
|
(errcode(ERRCODE_INTERNAL_ERROR),
|
|
errmsg("SELinux: could not translate security label: %m")));
|
|
|
|
PG_TRY();
|
|
{
|
|
result = pstrdup(raw_label);
|
|
}
|
|
PG_CATCH();
|
|
{
|
|
freecon(raw_label);
|
|
PG_RE_THROW();
|
|
}
|
|
PG_END_TRY();
|
|
freecon(raw_label);
|
|
|
|
PG_RETURN_TEXT_P(cstring_to_text(result));
|
|
}
|
|
|
|
/*
|
|
* TEXT sepgsql_mcstrans_out(TEXT)
|
|
*
|
|
* It translate the given raw MLS/MCS range into qualified format
|
|
* when mcstrans daemon is working.
|
|
*/
|
|
PG_FUNCTION_INFO_V1(sepgsql_mcstrans_out);
|
|
Datum
|
|
sepgsql_mcstrans_out(PG_FUNCTION_ARGS)
|
|
{
|
|
text *label = PG_GETARG_TEXT_PP(0);
|
|
char *qual_label;
|
|
char *result;
|
|
|
|
if (!sepgsql_is_enabled())
|
|
ereport(ERROR,
|
|
(errcode(ERRCODE_OBJECT_NOT_IN_PREREQUISITE_STATE),
|
|
errmsg("sepgsql is not currently enabled")));
|
|
|
|
if (selinux_raw_to_trans_context(text_to_cstring(label),
|
|
&qual_label) < 0)
|
|
ereport(ERROR,
|
|
(errcode(ERRCODE_INTERNAL_ERROR),
|
|
errmsg("SELinux: could not translate security label: %m")));
|
|
|
|
PG_TRY();
|
|
{
|
|
result = pstrdup(qual_label);
|
|
}
|
|
PG_CATCH();
|
|
{
|
|
freecon(qual_label);
|
|
PG_RE_THROW();
|
|
}
|
|
PG_END_TRY();
|
|
freecon(qual_label);
|
|
|
|
PG_RETURN_TEXT_P(cstring_to_text(result));
|
|
}
|
|
|
|
/*
|
|
* quote_object_names
|
|
*
|
|
* It tries to quote the supplied identifiers
|
|
*/
|
|
static char *
|
|
quote_object_name(const char *src1, const char *src2,
|
|
const char *src3, const char *src4)
|
|
{
|
|
StringInfoData result;
|
|
const char *temp;
|
|
|
|
initStringInfo(&result);
|
|
|
|
if (src1)
|
|
{
|
|
temp = quote_identifier(src1);
|
|
appendStringInfo(&result, "%s", temp);
|
|
if (src1 != temp)
|
|
pfree((void *) temp);
|
|
}
|
|
if (src2)
|
|
{
|
|
temp = quote_identifier(src2);
|
|
appendStringInfo(&result, ".%s", temp);
|
|
if (src2 != temp)
|
|
pfree((void *) temp);
|
|
}
|
|
if (src3)
|
|
{
|
|
temp = quote_identifier(src3);
|
|
appendStringInfo(&result, ".%s", temp);
|
|
if (src3 != temp)
|
|
pfree((void *) temp);
|
|
}
|
|
if (src4)
|
|
{
|
|
temp = quote_identifier(src4);
|
|
appendStringInfo(&result, ".%s", temp);
|
|
if (src4 != temp)
|
|
pfree((void *) temp);
|
|
}
|
|
return result.data;
|
|
}
|
|
|
|
/*
|
|
* exec_object_restorecon
|
|
*
|
|
* This routine is a helper called by sepgsql_restorecon; it set up
|
|
* initial security labels of database objects within the supplied
|
|
* catalog OID.
|
|
*/
|
|
static void
|
|
exec_object_restorecon(struct selabel_handle *sehnd, Oid catalogId)
|
|
{
|
|
Relation rel;
|
|
SysScanDesc sscan;
|
|
HeapTuple tuple;
|
|
char *database_name = get_database_name(MyDatabaseId);
|
|
char *namespace_name;
|
|
Oid namespace_id;
|
|
char *relation_name;
|
|
|
|
/*
|
|
* Open the target catalog. We don't want to allow writable accesses by
|
|
* other session during initial labeling.
|
|
*/
|
|
rel = heap_open(catalogId, AccessShareLock);
|
|
|
|
sscan = systable_beginscan(rel, InvalidOid, false,
|
|
NULL, 0, NULL);
|
|
while (HeapTupleIsValid(tuple = systable_getnext(sscan)))
|
|
{
|
|
Form_pg_database datForm;
|
|
Form_pg_namespace nspForm;
|
|
Form_pg_class relForm;
|
|
Form_pg_attribute attForm;
|
|
Form_pg_proc proForm;
|
|
char *objname;
|
|
int objtype = 1234;
|
|
ObjectAddress object;
|
|
security_context_t context;
|
|
|
|
/*
|
|
* The way to determine object name depends on object classes. So, any
|
|
* branches set up `objtype', `objname' and `object' here.
|
|
*/
|
|
switch (catalogId)
|
|
{
|
|
case DatabaseRelationId:
|
|
datForm = (Form_pg_database) GETSTRUCT(tuple);
|
|
|
|
objtype = SELABEL_DB_DATABASE;
|
|
|
|
objname = quote_object_name(NameStr(datForm->datname),
|
|
NULL, NULL, NULL);
|
|
|
|
object.classId = DatabaseRelationId;
|
|
object.objectId = datForm->oid;
|
|
object.objectSubId = 0;
|
|
break;
|
|
|
|
case NamespaceRelationId:
|
|
nspForm = (Form_pg_namespace) GETSTRUCT(tuple);
|
|
|
|
objtype = SELABEL_DB_SCHEMA;
|
|
|
|
objname = quote_object_name(database_name,
|
|
NameStr(nspForm->nspname),
|
|
NULL, NULL);
|
|
|
|
object.classId = NamespaceRelationId;
|
|
object.objectId = nspForm->oid;
|
|
object.objectSubId = 0;
|
|
break;
|
|
|
|
case RelationRelationId:
|
|
relForm = (Form_pg_class) GETSTRUCT(tuple);
|
|
|
|
if (relForm->relkind == RELKIND_RELATION ||
|
|
relForm->relkind == RELKIND_PARTITIONED_TABLE)
|
|
objtype = SELABEL_DB_TABLE;
|
|
else if (relForm->relkind == RELKIND_SEQUENCE)
|
|
objtype = SELABEL_DB_SEQUENCE;
|
|
else if (relForm->relkind == RELKIND_VIEW)
|
|
objtype = SELABEL_DB_VIEW;
|
|
else
|
|
continue; /* no need to assign security label */
|
|
|
|
namespace_name = get_namespace_name(relForm->relnamespace);
|
|
objname = quote_object_name(database_name,
|
|
namespace_name,
|
|
NameStr(relForm->relname),
|
|
NULL);
|
|
pfree(namespace_name);
|
|
|
|
object.classId = RelationRelationId;
|
|
object.objectId = relForm->oid;
|
|
object.objectSubId = 0;
|
|
break;
|
|
|
|
case AttributeRelationId:
|
|
attForm = (Form_pg_attribute) GETSTRUCT(tuple);
|
|
|
|
if (get_rel_relkind(attForm->attrelid) != RELKIND_RELATION &&
|
|
get_rel_relkind(attForm->attrelid) != RELKIND_PARTITIONED_TABLE)
|
|
continue; /* no need to assign security label */
|
|
|
|
objtype = SELABEL_DB_COLUMN;
|
|
|
|
namespace_id = get_rel_namespace(attForm->attrelid);
|
|
namespace_name = get_namespace_name(namespace_id);
|
|
relation_name = get_rel_name(attForm->attrelid);
|
|
objname = quote_object_name(database_name,
|
|
namespace_name,
|
|
relation_name,
|
|
NameStr(attForm->attname));
|
|
pfree(namespace_name);
|
|
pfree(relation_name);
|
|
|
|
object.classId = RelationRelationId;
|
|
object.objectId = attForm->attrelid;
|
|
object.objectSubId = attForm->attnum;
|
|
break;
|
|
|
|
case ProcedureRelationId:
|
|
proForm = (Form_pg_proc) GETSTRUCT(tuple);
|
|
|
|
objtype = SELABEL_DB_PROCEDURE;
|
|
|
|
namespace_name = get_namespace_name(proForm->pronamespace);
|
|
objname = quote_object_name(database_name,
|
|
namespace_name,
|
|
NameStr(proForm->proname),
|
|
NULL);
|
|
pfree(namespace_name);
|
|
|
|
object.classId = ProcedureRelationId;
|
|
object.objectId = proForm->oid;
|
|
object.objectSubId = 0;
|
|
break;
|
|
|
|
default:
|
|
elog(ERROR, "unexpected catalog id: %u", catalogId);
|
|
objname = NULL; /* for compiler quiet */
|
|
break;
|
|
}
|
|
|
|
if (selabel_lookup_raw(sehnd, &context, objname, objtype) == 0)
|
|
{
|
|
PG_TRY();
|
|
{
|
|
/*
|
|
* Check SELinux permission to relabel the fetched object,
|
|
* then do the actual relabeling.
|
|
*/
|
|
sepgsql_object_relabel(&object, context);
|
|
|
|
SetSecurityLabel(&object, SEPGSQL_LABEL_TAG, context);
|
|
}
|
|
PG_CATCH();
|
|
{
|
|
freecon(context);
|
|
PG_RE_THROW();
|
|
}
|
|
PG_END_TRY();
|
|
freecon(context);
|
|
}
|
|
else if (errno == ENOENT)
|
|
ereport(WARNING,
|
|
(errmsg("SELinux: no initial label assigned for %s (type=%d), skipping",
|
|
objname, objtype)));
|
|
else
|
|
ereport(ERROR,
|
|
(errcode(ERRCODE_INTERNAL_ERROR),
|
|
errmsg("SELinux: could not determine initial security label for %s (type=%d): %m", objname, objtype)));
|
|
|
|
pfree(objname);
|
|
}
|
|
systable_endscan(sscan);
|
|
|
|
heap_close(rel, NoLock);
|
|
}
|
|
|
|
/*
|
|
* BOOL sepgsql_restorecon(TEXT specfile)
|
|
*
|
|
* This function tries to assign initial security labels on all the object
|
|
* within the current database, according to the system setting.
|
|
* It is typically invoked by sepgsql-install script just after initdb, to
|
|
* assign initial security labels.
|
|
*
|
|
* If @specfile is not NULL, it uses explicitly specified specfile, instead
|
|
* of the system default.
|
|
*/
|
|
PG_FUNCTION_INFO_V1(sepgsql_restorecon);
|
|
Datum
|
|
sepgsql_restorecon(PG_FUNCTION_ARGS)
|
|
{
|
|
struct selabel_handle *sehnd;
|
|
struct selinux_opt seopts;
|
|
|
|
/*
|
|
* SELinux has to be enabled on the running platform.
|
|
*/
|
|
if (!sepgsql_is_enabled())
|
|
ereport(ERROR,
|
|
(errcode(ERRCODE_OBJECT_NOT_IN_PREREQUISITE_STATE),
|
|
errmsg("sepgsql is not currently enabled")));
|
|
|
|
/*
|
|
* Check DAC permission. Only superuser can set up initial security
|
|
* labels, like root-user in filesystems
|
|
*/
|
|
if (!superuser())
|
|
ereport(ERROR,
|
|
(errcode(ERRCODE_INSUFFICIENT_PRIVILEGE),
|
|
errmsg("SELinux: must be superuser to restore initial contexts")));
|
|
|
|
/*
|
|
* Open selabel_lookup(3) stuff. It provides a set of mapping between an
|
|
* initial security label and object class/name due to the system setting.
|
|
*/
|
|
if (PG_ARGISNULL(0))
|
|
{
|
|
seopts.type = SELABEL_OPT_UNUSED;
|
|
seopts.value = NULL;
|
|
}
|
|
else
|
|
{
|
|
seopts.type = SELABEL_OPT_PATH;
|
|
seopts.value = TextDatumGetCString(PG_GETARG_DATUM(0));
|
|
}
|
|
sehnd = selabel_open(SELABEL_CTX_DB, &seopts, 1);
|
|
if (!sehnd)
|
|
ereport(ERROR,
|
|
(errcode(ERRCODE_INTERNAL_ERROR),
|
|
errmsg("SELinux: failed to initialize labeling handle: %m")));
|
|
PG_TRY();
|
|
{
|
|
exec_object_restorecon(sehnd, DatabaseRelationId);
|
|
exec_object_restorecon(sehnd, NamespaceRelationId);
|
|
exec_object_restorecon(sehnd, RelationRelationId);
|
|
exec_object_restorecon(sehnd, AttributeRelationId);
|
|
exec_object_restorecon(sehnd, ProcedureRelationId);
|
|
}
|
|
PG_CATCH();
|
|
{
|
|
selabel_close(sehnd);
|
|
PG_RE_THROW();
|
|
}
|
|
PG_END_TRY();
|
|
|
|
selabel_close(sehnd);
|
|
|
|
PG_RETURN_BOOL(true);
|
|
}
|