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218 lines
5.2 KiB
C
218 lines
5.2 KiB
C
/* -------------------------------------------------------------------------
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*
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* contrib/sepgsql/database.c
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*
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* Routines corresponding to database objects
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*
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* Copyright (c) 2010-2016, 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 "access/genam.h"
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#include "access/heapam.h"
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#include "access/htup_details.h"
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#include "access/sysattr.h"
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#include "catalog/dependency.h"
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#include "catalog/pg_database.h"
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#include "catalog/indexing.h"
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#include "commands/dbcommands.h"
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#include "commands/seclabel.h"
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#include "utils/builtins.h"
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#include "utils/fmgroids.h"
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#include "utils/tqual.h"
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#include "sepgsql.h"
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/*
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* sepgsql_database_post_create
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*
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* This routine assigns a default security label on a newly defined
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* database, and check permission needed for its creation.
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*/
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void
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sepgsql_database_post_create(Oid databaseId, const char *dtemplate)
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{
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Relation rel;
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ScanKeyData skey;
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SysScanDesc sscan;
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HeapTuple tuple;
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char *tcontext;
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char *ncontext;
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ObjectAddress object;
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Form_pg_database datForm;
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StringInfoData audit_name;
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/*
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* Oid of the source database is not saved in pg_database catalog, so we
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* collect its identifier using contextual information. If NULL, its
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* default is "template1" according to createdb().
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*/
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if (!dtemplate)
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dtemplate = "template1";
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object.classId = DatabaseRelationId;
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object.objectId = get_database_oid(dtemplate, false);
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object.objectSubId = 0;
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tcontext = sepgsql_get_label(object.classId,
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object.objectId,
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object.objectSubId);
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/*
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* check db_database:{getattr} permission
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*/
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initStringInfo(&audit_name);
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appendStringInfo(&audit_name, "%s", quote_identifier(dtemplate));
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sepgsql_avc_check_perms_label(tcontext,
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SEPG_CLASS_DB_DATABASE,
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SEPG_DB_DATABASE__GETATTR,
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audit_name.data,
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true);
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/*
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* Compute a default security label of the newly created database based on
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* a pair of security label of client and source database.
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*
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* XXX - uncoming version of libselinux supports to take object name to
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* handle special treatment on default security label.
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*/
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rel = heap_open(DatabaseRelationId, AccessShareLock);
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ScanKeyInit(&skey,
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ObjectIdAttributeNumber,
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BTEqualStrategyNumber, F_OIDEQ,
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ObjectIdGetDatum(databaseId));
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sscan = systable_beginscan(rel, DatabaseOidIndexId, true,
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SnapshotSelf, 1, &skey);
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tuple = systable_getnext(sscan);
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if (!HeapTupleIsValid(tuple))
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elog(ERROR, "catalog lookup failed for database %u", databaseId);
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datForm = (Form_pg_database) GETSTRUCT(tuple);
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ncontext = sepgsql_compute_create(sepgsql_get_client_label(),
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tcontext,
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SEPG_CLASS_DB_DATABASE,
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NameStr(datForm->datname));
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/*
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* check db_database:{create} permission
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*/
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resetStringInfo(&audit_name);
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appendStringInfo(&audit_name, "%s",
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quote_identifier(NameStr(datForm->datname)));
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sepgsql_avc_check_perms_label(ncontext,
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SEPG_CLASS_DB_DATABASE,
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SEPG_DB_DATABASE__CREATE,
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audit_name.data,
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true);
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systable_endscan(sscan);
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heap_close(rel, AccessShareLock);
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/*
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* Assign the default security label on the new database
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*/
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object.classId = DatabaseRelationId;
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object.objectId = databaseId;
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object.objectSubId = 0;
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SetSecurityLabel(&object, SEPGSQL_LABEL_TAG, ncontext);
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pfree(ncontext);
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pfree(tcontext);
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}
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/*
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* sepgsql_database_drop
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*
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* It checks privileges to drop the supplied database
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*/
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void
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sepgsql_database_drop(Oid databaseId)
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{
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ObjectAddress object;
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char *audit_name;
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/*
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* check db_database:{drop} permission
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*/
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object.classId = DatabaseRelationId;
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object.objectId = databaseId;
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object.objectSubId = 0;
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audit_name = getObjectIdentity(&object);
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sepgsql_avc_check_perms(&object,
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SEPG_CLASS_DB_DATABASE,
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SEPG_DB_DATABASE__DROP,
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audit_name,
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true);
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pfree(audit_name);
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}
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/*
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* sepgsql_database_post_alter
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*
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* It checks privileges to alter the supplied database
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*/
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void
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sepgsql_database_setattr(Oid databaseId)
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{
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ObjectAddress object;
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char *audit_name;
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/*
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* check db_database:{setattr} permission
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*/
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object.classId = DatabaseRelationId;
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object.objectId = databaseId;
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object.objectSubId = 0;
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audit_name = getObjectIdentity(&object);
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sepgsql_avc_check_perms(&object,
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SEPG_CLASS_DB_DATABASE,
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SEPG_DB_DATABASE__SETATTR,
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audit_name,
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true);
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pfree(audit_name);
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}
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/*
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* sepgsql_database_relabel
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*
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* It checks privileges to relabel the supplied database with the `seclabel'
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*/
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void
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sepgsql_database_relabel(Oid databaseId, const char *seclabel)
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{
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ObjectAddress object;
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char *audit_name;
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object.classId = DatabaseRelationId;
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object.objectId = databaseId;
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object.objectSubId = 0;
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audit_name = getObjectIdentity(&object);
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/*
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* check db_database:{setattr relabelfrom} permission
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*/
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sepgsql_avc_check_perms(&object,
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SEPG_CLASS_DB_DATABASE,
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SEPG_DB_DATABASE__SETATTR |
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SEPG_DB_DATABASE__RELABELFROM,
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audit_name,
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true);
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/*
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* check db_database:{relabelto} permission
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*/
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sepgsql_avc_check_perms_label(seclabel,
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SEPG_CLASS_DB_DATABASE,
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SEPG_DB_DATABASE__RELABELTO,
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audit_name,
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true);
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pfree(audit_name);
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}
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