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236 lines
5.5 KiB
C
236 lines
5.5 KiB
C
/* -------------------------------------------------------------------------
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*
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* contrib/sepgsql/schema.c
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*
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* Routines corresponding to schema objects
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*
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* Copyright (c) 2010-2022, 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/htup_details.h"
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#include "access/sysattr.h"
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#include "access/table.h"
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#include "catalog/dependency.h"
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#include "catalog/pg_database.h"
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#include "catalog/pg_namespace.h"
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#include "commands/seclabel.h"
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#include "lib/stringinfo.h"
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#include "miscadmin.h"
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#include "sepgsql.h"
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#include "utils/builtins.h"
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#include "utils/fmgroids.h"
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#include "utils/lsyscache.h"
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#include "utils/snapmgr.h"
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/*
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* sepgsql_schema_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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* schema.
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*/
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void
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sepgsql_schema_post_create(Oid namespaceId)
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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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const char *nsp_name;
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ObjectAddress object;
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Form_pg_namespace nspForm;
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StringInfoData audit_name;
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/*
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* Compute a default security label when we create a new schema object
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* under the working database.
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*
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* XXX - upcoming version of libselinux supports to take object name to
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* handle special treatment on default security label; such as special
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* label on "pg_temp" schema.
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*/
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rel = table_open(NamespaceRelationId, AccessShareLock);
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ScanKeyInit(&skey,
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Anum_pg_namespace_oid,
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BTEqualStrategyNumber, F_OIDEQ,
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ObjectIdGetDatum(namespaceId));
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sscan = systable_beginscan(rel, NamespaceOidIndexId, 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, "could not find tuple for namespace %u", namespaceId);
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nspForm = (Form_pg_namespace) GETSTRUCT(tuple);
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nsp_name = NameStr(nspForm->nspname);
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if (strncmp(nsp_name, "pg_temp_", 8) == 0)
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nsp_name = "pg_temp";
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else if (strncmp(nsp_name, "pg_toast_temp_", 14) == 0)
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nsp_name = "pg_toast_temp";
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tcontext = sepgsql_get_label(DatabaseRelationId, MyDatabaseId, 0);
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ncontext = sepgsql_compute_create(sepgsql_get_client_label(),
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tcontext,
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SEPG_CLASS_DB_SCHEMA,
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nsp_name);
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/*
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* check db_schema:{create}
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*/
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initStringInfo(&audit_name);
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appendStringInfo(&audit_name, "%s", quote_identifier(nsp_name));
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sepgsql_avc_check_perms_label(ncontext,
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SEPG_CLASS_DB_SCHEMA,
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SEPG_DB_SCHEMA__CREATE,
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audit_name.data,
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true);
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systable_endscan(sscan);
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table_close(rel, AccessShareLock);
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/*
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* Assign the default security label on a new procedure
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*/
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object.classId = NamespaceRelationId;
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object.objectId = namespaceId;
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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_schema_drop
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*
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* It checks privileges to drop the supplied schema object.
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*/
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void
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sepgsql_schema_drop(Oid namespaceId)
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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_schema:{drop} permission
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*/
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object.classId = NamespaceRelationId;
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object.objectId = namespaceId;
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object.objectSubId = 0;
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audit_name = getObjectIdentity(&object, false);
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sepgsql_avc_check_perms(&object,
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SEPG_CLASS_DB_SCHEMA,
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SEPG_DB_SCHEMA__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_schema_relabel
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*
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* It checks privileges to relabel the supplied schema
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* by the `seclabel'.
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*/
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void
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sepgsql_schema_relabel(Oid namespaceId, 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 = NamespaceRelationId;
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object.objectId = namespaceId;
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object.objectSubId = 0;
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audit_name = getObjectIdentity(&object, false);
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/*
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* check db_schema:{setattr relabelfrom} permission
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*/
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sepgsql_avc_check_perms(&object,
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SEPG_CLASS_DB_SCHEMA,
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SEPG_DB_SCHEMA__SETATTR |
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SEPG_DB_SCHEMA__RELABELFROM,
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audit_name,
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true);
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/*
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* check db_schema:{relabelto} permission
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*/
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sepgsql_avc_check_perms_label(seclabel,
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SEPG_CLASS_DB_SCHEMA,
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SEPG_DB_SCHEMA__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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/*
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* sepgsql_schema_check_perms
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*
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* utility routine to check db_schema:{xxx} permissions
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*/
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static bool
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check_schema_perms(Oid namespaceId, uint32 required, bool abort_on_violation)
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{
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ObjectAddress object;
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char *audit_name;
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bool result;
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object.classId = NamespaceRelationId;
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object.objectId = namespaceId;
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object.objectSubId = 0;
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audit_name = getObjectIdentity(&object, false);
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result = sepgsql_avc_check_perms(&object,
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SEPG_CLASS_DB_SCHEMA,
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required,
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audit_name,
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abort_on_violation);
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pfree(audit_name);
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return result;
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}
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/* db_schema:{setattr} permission */
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void
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sepgsql_schema_setattr(Oid namespaceId)
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{
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check_schema_perms(namespaceId, SEPG_DB_SCHEMA__SETATTR, true);
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}
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/* db_schema:{search} permission */
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bool
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sepgsql_schema_search(Oid namespaceId, bool abort_on_violation)
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{
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return check_schema_perms(namespaceId,
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SEPG_DB_SCHEMA__SEARCH,
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abort_on_violation);
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}
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void
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sepgsql_schema_add_name(Oid namespaceId)
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{
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check_schema_perms(namespaceId, SEPG_DB_SCHEMA__ADD_NAME, true);
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}
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void
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sepgsql_schema_remove_name(Oid namespaceId)
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{
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check_schema_perms(namespaceId, SEPG_DB_SCHEMA__REMOVE_NAME, true);
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}
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void
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sepgsql_schema_rename(Oid namespaceId)
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{
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check_schema_perms(namespaceId,
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SEPG_DB_SCHEMA__ADD_NAME |
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SEPG_DB_SCHEMA__REMOVE_NAME,
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true);
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}
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