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Diffstat (limited to 'contrib/sepgsql/database.c')
| -rw-r--r-- | contrib/sepgsql/database.c | 216 |
1 files changed, 216 insertions, 0 deletions
diff --git a/contrib/sepgsql/database.c b/contrib/sepgsql/database.c new file mode 100644 index 0000000..14a74fb --- /dev/null +++ b/contrib/sepgsql/database.c @@ -0,0 +1,216 @@ +/* ------------------------------------------------------------------------- + * + * contrib/sepgsql/database.c + * + * Routines corresponding to database objects + * + * Copyright (c) 2010-2021, PostgreSQL Global Development Group + * + * ------------------------------------------------------------------------- + */ +#include "postgres.h" + +#include "access/genam.h" +#include "access/htup_details.h" +#include "access/sysattr.h" +#include "access/table.h" +#include "catalog/dependency.h" +#include "catalog/pg_database.h" +#include "commands/dbcommands.h" +#include "commands/seclabel.h" +#include "sepgsql.h" +#include "utils/builtins.h" +#include "utils/fmgroids.h" +#include "utils/snapmgr.h" + +/* + * sepgsql_database_post_create + * + * This routine assigns a default security label on a newly defined + * database, and check permission needed for its creation. + */ +void +sepgsql_database_post_create(Oid databaseId, const char *dtemplate) +{ + Relation rel; + ScanKeyData skey; + SysScanDesc sscan; + HeapTuple tuple; + char *tcontext; + char *ncontext; + ObjectAddress object; + Form_pg_database datForm; + StringInfoData audit_name; + + /* + * Oid of the source database is not saved in pg_database catalog, so we + * collect its identifier using contextual information. If NULL, its + * default is "template1" according to createdb(). + */ + if (!dtemplate) + dtemplate = "template1"; + + object.classId = DatabaseRelationId; + object.objectId = get_database_oid(dtemplate, false); + object.objectSubId = 0; + + tcontext = sepgsql_get_label(object.classId, + object.objectId, + object.objectSubId); + + /* + * check db_database:{getattr} permission + */ + initStringInfo(&audit_name); + appendStringInfoString(&audit_name, quote_identifier(dtemplate)); + sepgsql_avc_check_perms_label(tcontext, + SEPG_CLASS_DB_DATABASE, + SEPG_DB_DATABASE__GETATTR, + audit_name.data, + true); + + /* + * Compute a default security label of the newly created database based on + * a pair of security label of client and source database. + * + * XXX - upcoming version of libselinux supports to take object name to + * handle special treatment on default security label. + */ + rel = table_open(DatabaseRelationId, AccessShareLock); + + ScanKeyInit(&skey, + Anum_pg_database_oid, + BTEqualStrategyNumber, F_OIDEQ, + ObjectIdGetDatum(databaseId)); + + sscan = systable_beginscan(rel, DatabaseOidIndexId, true, + SnapshotSelf, 1, &skey); + tuple = systable_getnext(sscan); + if (!HeapTupleIsValid(tuple)) + elog(ERROR, "could not find tuple for database %u", databaseId); + + datForm = (Form_pg_database) GETSTRUCT(tuple); + + ncontext = sepgsql_compute_create(sepgsql_get_client_label(), + tcontext, + SEPG_CLASS_DB_DATABASE, + NameStr(datForm->datname)); + + /* + * check db_database:{create} permission + */ + resetStringInfo(&audit_name); + appendStringInfoString(&audit_name, + quote_identifier(NameStr(datForm->datname))); + sepgsql_avc_check_perms_label(ncontext, + SEPG_CLASS_DB_DATABASE, + SEPG_DB_DATABASE__CREATE, + audit_name.data, + true); + + systable_endscan(sscan); + table_close(rel, AccessShareLock); + + /* + * Assign the default security label on the new database + */ + object.classId = DatabaseRelationId; + object.objectId = databaseId; + object.objectSubId = 0; + + SetSecurityLabel(&object, SEPGSQL_LABEL_TAG, ncontext); + + pfree(ncontext); + pfree(tcontext); +} + +/* + * sepgsql_database_drop + * + * It checks privileges to drop the supplied database + */ +void +sepgsql_database_drop(Oid databaseId) +{ + ObjectAddress object; + char *audit_name; + + /* + * check db_database:{drop} permission + */ + object.classId = DatabaseRelationId; + object.objectId = databaseId; + object.objectSubId = 0; + audit_name = getObjectIdentity(&object, false); + + sepgsql_avc_check_perms(&object, + SEPG_CLASS_DB_DATABASE, + SEPG_DB_DATABASE__DROP, + audit_name, + true); + pfree(audit_name); +} + +/* + * sepgsql_database_post_alter + * + * It checks privileges to alter the supplied database + */ +void +sepgsql_database_setattr(Oid databaseId) +{ + ObjectAddress object; + char *audit_name; + + /* + * check db_database:{setattr} permission + */ + object.classId = DatabaseRelationId; + object.objectId = databaseId; + object.objectSubId = 0; + audit_name = getObjectIdentity(&object, false); + + sepgsql_avc_check_perms(&object, + SEPG_CLASS_DB_DATABASE, + SEPG_DB_DATABASE__SETATTR, + audit_name, + true); + pfree(audit_name); +} + +/* + * sepgsql_database_relabel + * + * It checks privileges to relabel the supplied database with the `seclabel' + */ +void +sepgsql_database_relabel(Oid databaseId, const char *seclabel) +{ + ObjectAddress object; + char *audit_name; + + object.classId = DatabaseRelationId; + object.objectId = databaseId; + object.objectSubId = 0; + audit_name = getObjectIdentity(&object, false); + + /* + * check db_database:{setattr relabelfrom} permission + */ + sepgsql_avc_check_perms(&object, + SEPG_CLASS_DB_DATABASE, + SEPG_DB_DATABASE__SETATTR | + SEPG_DB_DATABASE__RELABELFROM, + audit_name, + true); + + /* + * check db_database:{relabelto} permission + */ + sepgsql_avc_check_perms_label(seclabel, + SEPG_CLASS_DB_DATABASE, + SEPG_DB_DATABASE__RELABELTO, + audit_name, + true); + pfree(audit_name); +} |