/usr/share/pyshared/zope/security/_zope_security_checker.c is in python-zope.security 3.8.3-2ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 | /*
Copyright (c) 2004 Zope Foundation and Contributors.
All Rights Reserved.
This software is subject to the provisions of the Zope Public License,
Version 2.1 (ZPL). A copy of the ZPL should accompany this distribution.
THIS SOFTWARE IS PROVIDED "AS IS" AND ANY AND ALL EXPRESS OR IMPLIED
WARRANTIES ARE DISCLAIMED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
WARRANTIES OF TITLE, MERCHANTABILITY, AGAINST INFRINGEMENT, AND FITNESS
FOR A PARTICULAR PURPOSE.
*/
#include <Python.h>
static PyObject *_checkers, *_defaultChecker, *_available_by_default, *NoProxy;
static PyObject *Proxy, *thread_local, *CheckerPublic;
static PyObject *ForbiddenAttribute, *Unauthorized;
#define DECLARE_STRING(N) static PyObject *str_##N
DECLARE_STRING(checkPermission);
DECLARE_STRING(__Security_checker__);
DECLARE_STRING(interaction);
#define CLEAR(O) if (O) {PyObject *t = O; O = 0; Py_DECREF(t); }
typedef struct {
PyObject_HEAD
PyObject *getperms, *setperms;
} Checker;
/* def permission_id(self, name): */
static PyObject *
Checker_permission_id(Checker *self, PyObject *name)
{
/* return self._permission_func(name) */
PyObject *result;
if (self->getperms)
{
result = PyDict_GetItem(self->getperms, name);
if (result == NULL)
result = Py_None;
}
else
result = Py_None;
Py_INCREF(result);
return result;
}
/* def setattr_permission_id(self, name): */
static PyObject *
Checker_setattr_permission_id(Checker *self, PyObject *name)
{
/* return self._setattr_permission_func(name) */
PyObject *result;
if (self->setperms)
{
result = PyDict_GetItem(self->setperms, name);
if (result == NULL)
result = Py_None;
}
else
result = Py_None;
Py_INCREF(result);
return result;
}
static int
checkPermission(PyObject *permission, PyObject *object, PyObject *name)
{
PyObject *interaction, *r;
int i;
/* if thread_local.interaction.checkPermission(permission, object): */
/* return */
interaction = PyObject_GetAttr(thread_local, str_interaction);
if (interaction == NULL)
return -1;
r = PyObject_CallMethodObjArgs(interaction, str_checkPermission,
permission, object, NULL);
Py_DECREF(interaction);
if (r == NULL)
return -1;
i = PyObject_IsTrue(r);
Py_DECREF(r);
if (i < 0)
return -1;
if (i)
return 0;
/* else: */
/* __traceback_supplement__ = (TracebackSupplement, object) */
/* raise Unauthorized(object, name, permission) */
r = Py_BuildValue("OOO", object, name, permission);
if (r == NULL)
return -1;
PyErr_SetObject(Unauthorized, r);
Py_DECREF(r);
return -1;
}
/* def check(self, object, name): */
/* Note that we have an int version here because we will use it for
__setitem__, as described below */
static int
Checker_check_int(Checker *self, PyObject *object, PyObject *name)
{
PyObject *permission=NULL;
int operator;
/* permission = self._permission_func(name) */
if (self->getperms)
permission = PyDict_GetItem(self->getperms, name);
/* if permission is not None: */
if (permission != NULL)
{
/* if permission is CheckerPublic: */
/* return # Public */
if (permission == CheckerPublic)
return 0;
if (checkPermission(permission, object, name) < 0)
return -1;
return 0;
}
operator = (PyString_Check(name)
&& PyString_AS_STRING(name)[0] == '_'
&& PyString_AS_STRING(name)[1] == '_');
if (operator)
{
/* elif name in _available_by_default: */
/* return */
int ic = PySequence_Contains(_available_by_default, name);
if (ic < 0)
return -1;
if (ic)
return 0;
/* if name != '__iter__' or hasattr(object, name): */
/* __traceback_supplement__ = (TracebackSupplement, object) */
/* raise ForbiddenAttribute, (name, object) */
if (strcmp("__iter__", PyString_AS_STRING(name)) == 0
&& ! PyObject_HasAttr(object, name))
/* We want an attr error if we're asked for __iter__ and we don't
have it. We'll get one by allowing the access. */
return 0;
}
{
PyObject *args;
args = Py_BuildValue("OO", name, object);
if (args != NULL)
{
PyErr_SetObject(ForbiddenAttribute, args);
Py_DECREF(args);
}
return -1;
}
}
/* Here we have the non-int version, implemented using the int
version, which is exposed as a method */
static PyObject *
Checker_check(Checker *self, PyObject *args)
{
PyObject *object, *name;
if (!PyArg_ParseTuple(args, "OO", &object, &name))
return NULL;
if (Checker_check_int(self, object, name) < 0)
return NULL;
Py_INCREF(Py_None);
return Py_None;
}
/* def check_setattr(self, object, name): */
static PyObject *
Checker_check_setattr(Checker *self, PyObject *args)
{
PyObject *object, *name, *permission=NULL;
if (!PyArg_ParseTuple(args, "OO", &object, &name))
return NULL;
/* permission = self._permission_func(name) */
if (self->setperms)
permission = PyDict_GetItem(self->setperms, name);
/* if permission is not None: */
if (permission != NULL)
{
/* if permission is CheckerPublic: */
/* return # Public */
if (permission != CheckerPublic
&& checkPermission(permission, object, name) < 0)
return NULL;
Py_INCREF(Py_None);
return Py_None;
}
/* __traceback_supplement__ = (TracebackSupplement, object) */
/* raise ForbiddenAttribute, (name, object) */
args = Py_BuildValue("OO", name, object);
if (args != NULL)
{
PyErr_SetObject(ForbiddenAttribute, args);
Py_DECREF(args);
}
return NULL;
}
static PyObject *
selectChecker(PyObject *ignored, PyObject *object);
/* def proxy(self, value): */
static PyObject *
Checker_proxy(Checker *self, PyObject *value)
{
PyObject *checker, *r;
/* if type(value) is Proxy: */
/* return value */
if ((PyObject*)(value->ob_type) == Proxy)
{
Py_INCREF(value);
return value;
}
/* checker = getattr(value, '__Security_checker__', None) */
checker = PyObject_GetAttr(value, str___Security_checker__);
/* if checker is None: */
if (checker == NULL)
{
PyErr_Clear();
/* checker = selectChecker(value) */
checker = selectChecker(NULL, value);
if (checker == NULL)
return NULL;
/* if checker is None: */
/* return value */
if (checker == Py_None)
{
Py_DECREF(checker);
Py_INCREF(value);
return value;
}
}
else if (checker == Py_None)
{
PyObject *errv = Py_BuildValue("sO",
"Invalid value, None. "
"for security checker",
value);
if (errv != NULL)
{
PyErr_SetObject(PyExc_ValueError, errv);
Py_DECREF(errv);
}
return NULL;
}
r = PyObject_CallFunctionObjArgs(Proxy, value, checker, NULL);
Py_DECREF(checker);
return r;
}
/* return Proxy(value, checker) */
static struct PyMethodDef Checker_methods[] = {
{"permission_id", (PyCFunction)Checker_permission_id, METH_O,
"permission_id(name) -- Return the permission neded to get the name"},
{"setattr_permission_id", (PyCFunction)Checker_setattr_permission_id,
METH_O,
"setattr_permission_id(name) -- Return the permission neded to set the name"
},
{"check_getattr", (PyCFunction)Checker_check, METH_VARARGS,
"check_getattr(object, name) -- Check whether a getattr is allowes"},
{"check_setattr", (PyCFunction)Checker_check_setattr, METH_VARARGS,
"check_setattr(object, name) -- Check whether a setattr is allowes"},
{"check", (PyCFunction)Checker_check, METH_VARARGS,
"check(object, opname) -- Check whether an operation is allowes"},
{"proxy", (PyCFunction)Checker_proxy, METH_O,
"proxy(object) -- Security-proxy an object"},
{NULL, NULL} /* sentinel */
};
static int
Checker_clear(Checker *self)
{
CLEAR(self->getperms);
CLEAR(self->setperms);
return 0;
}
static void
Checker_dealloc(Checker *self)
{
Checker_clear(self);
self->ob_type->tp_free((PyObject*)self);
}
static int
Checker_traverse(Checker *self, visitproc visit, void *arg)
{
if (self->getperms != NULL && visit(self->getperms, arg) < 0)
return -1;
if (self->setperms != NULL && visit(self->setperms, arg) < 0)
return -1;
return 0;
}
static int
Checker_init(Checker *self, PyObject *args, PyObject *kwds)
{
PyObject *getperms, *setperms=NULL;
static char *kwlist[] = {"get_permissions", "set_permissions", NULL};
if (! PyArg_ParseTupleAndKeywords(args, kwds, "O!|O!:Checker", kwlist,
&PyDict_Type, &getperms,
&PyDict_Type, &setperms))
return -1;
Py_INCREF(getperms);
self->getperms = getperms;
Py_XINCREF(setperms);
self->setperms = setperms;
return 0;
}
static PyObject *
Checker_get_get_permissions(Checker *self, void *closure)
{
if (self->getperms == NULL)
{
self->getperms = PyDict_New();
if (self->getperms == NULL)
return NULL;
}
Py_INCREF(self->getperms);
return self->getperms;
}
static PyObject *
Checker_get_set_permissions(Checker *self, void *closure)
{
if (self->setperms == NULL)
{
self->setperms = PyDict_New();
if (self->setperms == NULL)
return NULL;
}
Py_INCREF(self->setperms);
return self->setperms;
}
static PyGetSetDef Checker_getset[] = {
{"get_permissions",
(getter)Checker_get_get_permissions, NULL,
"getattr name to permission dictionary",
NULL},
{"set_permissions",
(getter)Checker_get_set_permissions, NULL,
"setattr name to permission dictionary",
NULL},
{NULL} /* Sentinel */
};
/* We create operator aliases for check and proxy. Why? Because
calling operator slots is much faster than calling methods and
security checks are done so often that speed matters. So we have
this hack of using almost-arbitrary operations to represent methods
that we call alot. The security proxy implementation participates
in the same hack. */
static PyMappingMethods Checker_as_mapping = {
/* mp_length */ NULL,
/* mp_subscript */ (binaryfunc)Checker_proxy,
/* mp_ass_subscript */ (objobjargproc)Checker_check_int,
};
static PyTypeObject CheckerType = {
PyObject_HEAD_INIT(NULL)
/* ob_size */ 0,
/* tp_name */ "zope.security.checker."
"Checker",
/* tp_basicsize */ sizeof(Checker),
/* tp_itemsize */ 0,
/* tp_dealloc */ (destructor)&Checker_dealloc,
/* tp_print */ (printfunc)0,
/* tp_getattr */ (getattrfunc)0,
/* tp_setattr */ (setattrfunc)0,
/* tp_compare */ (cmpfunc)0,
/* tp_repr */ (reprfunc)0,
/* tp_as_number */ 0,
/* tp_as_sequence */ 0,
/* tp_as_mapping */ &Checker_as_mapping,
/* tp_hash */ (hashfunc)0,
/* tp_call */ (ternaryfunc)0,
/* tp_str */ (reprfunc)0,
/* tp_getattro */ (getattrofunc)0,
/* tp_setattro */ (setattrofunc)0,
/* tp_as_buffer */ 0,
/* tp_flags */ Py_TPFLAGS_DEFAULT
| Py_TPFLAGS_BASETYPE
| Py_TPFLAGS_HAVE_GC,
/* tp_doc */ "Security checker",
/* tp_traverse */ (traverseproc)Checker_traverse,
/* tp_clear */ (inquiry)Checker_clear,
/* tp_richcompare */ (richcmpfunc)0,
/* tp_weaklistoffset */ (long)0,
/* tp_iter */ (getiterfunc)0,
/* tp_iternext */ (iternextfunc)0,
/* tp_methods */ Checker_methods,
/* tp_members */ 0,
/* tp_getset */ Checker_getset,
/* tp_base */ 0,
/* tp_dict */ 0, /* internal use */
/* tp_descr_get */ (descrgetfunc)0,
/* tp_descr_set */ (descrsetfunc)0,
/* tp_dictoffset */ 0,
/* tp_init */ (initproc)Checker_init,
/* tp_alloc */ (allocfunc)0,
/* tp_new */ (newfunc)0,
/* tp_free */ 0, /* Low-level free-mem routine */
/* tp_is_gc */ (inquiry)0, /* For PyObject_IS_GC */
};
/* def selectChecker(object): */
/* """Get a checker for the given object */
/* The appropriate checker is returned or None is returned. If the */
/* return value is None, then object should not be wrapped in a proxy. */
/* """ */
static char selectChecker_doc[] =
"Get a checker for the given object\n"
"\n"
"The appropriate checker is returned or None is returned. If the\n"
"return value is None, then object should not be wrapped in a proxy.\n"
;
static PyObject *
selectChecker(PyObject *ignored, PyObject *object)
{
PyObject *checker;
/* checker = _getChecker(type(object), _defaultChecker) */
checker = PyDict_GetItem(_checkers, (PyObject*)(object->ob_type));
if (checker == NULL)
checker = _defaultChecker;
/* if checker is NoProxy: */
/* return None */
if (checker == NoProxy)
{
Py_INCREF(Py_None);
return Py_None;
}
/* if checker is _defaultChecker and isinstance(object, Exception): */
/* return None */
if (checker == _defaultChecker
&& PyObject_IsInstance(object, PyExc_Exception))
{
Py_INCREF(Py_None);
return Py_None;
}
/* while not isinstance(checker, Checker): */
/* checker = checker(object) */
/* if checker is NoProxy or checker is None: */
/* return None */
Py_INCREF(checker);
while (! PyObject_TypeCheck(checker, &CheckerType))
{
PyObject *newchecker;
newchecker = PyObject_CallFunctionObjArgs(checker, object, NULL);
Py_DECREF(checker);
if (newchecker == NULL)
return NULL;
checker = newchecker;
if (checker == NoProxy || checker == Py_None)
{
Py_DECREF(checker);
Py_INCREF(Py_None);
return Py_None;
}
}
/* return checker */
return checker;
}
static PyMethodDef module_methods[] = {
{"selectChecker", (PyCFunction)selectChecker, METH_O, selectChecker_doc},
{NULL} /* Sentinel */
};
#ifndef PyMODINIT_FUNC /* declarations for DLL import/export */
#define PyMODINIT_FUNC void
#endif
PyMODINIT_FUNC
init_zope_security_checker(void)
{
PyObject* m;
CheckerType.tp_new = PyType_GenericNew;
if (PyType_Ready(&CheckerType) < 0)
return;
_defaultChecker = PyObject_CallFunction((PyObject*)&CheckerType, "{}");
if (_defaultChecker == NULL)
return;
#define INIT_STRING(S) \
if((str_##S = PyString_InternFromString(#S)) == NULL) return
INIT_STRING(checkPermission);
INIT_STRING(__Security_checker__);
INIT_STRING(interaction);
if ((_checkers = PyDict_New()) == NULL)
return;
NoProxy = PyObject_CallObject((PyObject*)&PyBaseObject_Type, NULL);
if (NoProxy == NULL)
return;
if ((m = PyImport_ImportModule("zope.security._proxy")) == NULL) return;
if ((Proxy = PyObject_GetAttrString(m, "_Proxy")) == NULL) return;
Py_DECREF(m);
if ((m = PyImport_ImportModule("zope.security._definitions")) == NULL) return;
thread_local = PyObject_GetAttrString(m, "thread_local");
if (thread_local == NULL) return;
Py_DECREF(m);
if ((m = PyImport_ImportModule("zope.security.interfaces")) == NULL) return;
ForbiddenAttribute = PyObject_GetAttrString(m, "ForbiddenAttribute");
if (ForbiddenAttribute == NULL) return;
Unauthorized = PyObject_GetAttrString(m, "Unauthorized");
if (Unauthorized == NULL) return;
Py_DECREF(m);
if ((m = PyImport_ImportModule("zope.security.checker")) == NULL) return;
CheckerPublic = PyObject_GetAttrString(m, "CheckerPublic");
if (CheckerPublic == NULL) return;
Py_DECREF(m);
if ((_available_by_default = PyList_New(0)) == NULL) return;
m = Py_InitModule3("_zope_security_checker", module_methods,
"C optimizations for zope.security.checker");
if (m == NULL)
return;
#define EXPORT(N) Py_INCREF(N); PyModule_AddObject(m, #N, N)
EXPORT(_checkers);
EXPORT(NoProxy);
EXPORT(_defaultChecker);
EXPORT(_available_by_default);
Py_INCREF(&CheckerType);
PyModule_AddObject(m, "Checker", (PyObject *)&CheckerType);
}
|