source4/auth/pyauth.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3    Copyright (C) Jelmer Vernooij <jelmer@samba.org> 2007-2008
   4    Copyright (C) Andrew Bartlett <abartlet@samba.org> 2011
   5
   6    This program is free software; you can redistribute it and/or modify
   7    it under the terms of the GNU General Public License as published by
   8    the Free Software Foundation; either version 3 of the License, or
   9    (at your option) any later version.
  10
  11    This program is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14    GNU General Public License for more details.
  15
  16    You should have received a copy of the GNU General Public License
  17    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  18 */
  19
  20 #include <Python.h>
  21 #include "includes.h"
  22 #include "libcli/util/pyerrors.h"
  23 #include "param/param.h"
  24 #include "pyauth.h"
  25 #include "pyldb.h"
  26 #include "auth/system_session_proto.h"
  27 #include "auth/auth.h"
  28 #include "param/pyparam.h"
  29 #include "libcli/security/security.h"
  30 #include "auth/credentials/pycredentials.h"
  31 #include <tevent.h>
  32 #include "librpc/rpc/pyrpc_util.h"
  33
  34 staticforward PyTypeObject PyAuthContext;
  35
  36 /* There's no Py_ssize_t in 2.4, apparently */
  37 #if PY_MAJOR_VERSION == 2 && PY_MINOR_VERSION < 5
  38 typedef int Py_ssize_t;
  39 typedef inquiry lenfunc;
  40 typedef intargfunc ssizeargfunc;
  41 #endif
  42
  43 #ifndef Py_RETURN_NONE
  44 #define Py_RETURN_NONE return Py_INCREF(Py_None), Py_None
  45 #endif
  46
  47 static PyObject *py_auth_session_get_security_token(PyObject *self, void *closure)
  48 {
  49         struct auth_session_info *session = py_talloc_get_type(self, struct auth_session_info);
  50         PyObject *py_security_token;
  51         py_security_token = py_return_ndr_struct("samba.dcerpc.security", "token",
  52                                                  session->security_token, session->security_token);
  53         return py_security_token;
  54 }
  55
  56 static int py_auth_session_set_security_token(PyObject *self, PyObject *value, void *closure)
  57 {
  58         struct auth_session_info *session = py_talloc_get_type(self, struct auth_session_info);
  59         session->security_token = talloc_reference(session, py_talloc_get_ptr(value));
  60         return 0;
  61 }
  62
  63 static PyObject *py_auth_session_get_session_key(PyObject *self, void *closure)
  64 {
  65         struct auth_session_info *session = py_talloc_get_type(self, struct auth_session_info);
  66         return PyString_FromStringAndSize((char *)session->session_key.data, session->session_key.length);
  67 }
  68
  69 static int py_auth_session_set_session_key(PyObject *self, PyObject *value, void *closure)
  70 {
  71         DATA_BLOB val;
  72         struct auth_session_info *session = py_talloc_get_type(self, struct auth_session_info);
  73         val.data = (uint8_t *)PyString_AsString(value);
  74         val.length = PyString_Size(value);
  75
  76         session->session_key = data_blob_talloc(session, val.data, val.length);
  77         return 0;
  78 }
  79
  80 static PyObject *py_auth_session_get_credentials(PyObject *self, void *closure)
  81 {
  82         struct auth_session_info *session = py_talloc_get_type(self, struct auth_session_info);
  83         PyObject *py_credentials;
  84         /* This is evil, as the credentials are not IDL structures */
  85         py_credentials = py_return_ndr_struct("samba.credentials", "Credentials", session->credentials, session->credentials);
  86         return py_credentials;
  87 }
  88
  89 static int py_auth_session_set_credentials(PyObject *self, PyObject *value, void *closure)
  90 {
  91         struct auth_session_info *session = py_talloc_get_type(self, struct auth_session_info);
  92         session->credentials = talloc_reference(session, PyCredentials_AsCliCredentials(value));
  93         return 0;
  94 }
  95
  96 static PyGetSetDef py_auth_session_getset[] = {
  97         { discard_const_p(char, "security_token"), (getter)py_auth_session_get_security_token, (setter)py_auth_session_set_security_token, NULL },
  98         { discard_const_p(char, "session_key"), (getter)py_auth_session_get_session_key, (setter)py_auth_session_set_session_key, NULL },
  99         { discard_const_p(char, "credentials"), (getter)py_auth_session_get_credentials, (setter)py_auth_session_set_credentials, NULL },
 100         { NULL }
 101 };
 102
 103 static PyTypeObject PyAuthSession = {
 104         .tp_name = "AuthSession",
 105         .tp_basicsize = sizeof(py_talloc_Object),
 106         .tp_flags = Py_TPFLAGS_DEFAULT,
 107         .tp_getset = py_auth_session_getset,
 108 };
 109
 110 PyObject *PyAuthSession_FromSession(struct auth_session_info *session)
 111 {
 112         return py_talloc_reference(&PyAuthSession, session);
 113 }
 114
 115 static PyObject *py_system_session(PyObject *module, PyObject *args)
 116 {
 117         PyObject *py_lp_ctx = Py_None;
 118         struct loadparm_context *lp_ctx = NULL;
 119         struct auth_session_info *session;
 120         TALLOC_CTX *mem_ctx;
 121         if (!PyArg_ParseTuple(args, "|O", &py_lp_ctx))
 122                 return NULL;
 123
 124         mem_ctx = talloc_new(NULL);
 125         if (mem_ctx == NULL) {
 126                 PyErr_NoMemory();
 127                 return NULL;
 128         }
 129
 130         lp_ctx = lpcfg_from_py_object(mem_ctx, py_lp_ctx);
 131         if (lp_ctx == NULL) {
 132                 talloc_free(mem_ctx);
 133                 return NULL;
 134         }
 135
 136         session = system_session(lp_ctx);
 137
 138         talloc_free(mem_ctx);
 139
 140         return PyAuthSession_FromSession(session);
 141 }
 142
 143
 144 static PyObject *py_admin_session(PyObject *module, PyObject *args)
 145 {
 146         PyObject *py_lp_ctx;
 147         PyObject *py_sid;
 148         struct loadparm_context *lp_ctx = NULL;
 149         struct auth_session_info *session;
 150         struct dom_sid *domain_sid = NULL;
 151         TALLOC_CTX *mem_ctx;
 152
 153         if (!PyArg_ParseTuple(args, "OO", &py_lp_ctx, &py_sid))
 154                 return NULL;
 155
 156         mem_ctx = talloc_new(NULL);
 157         if (mem_ctx == NULL) {
 158                 PyErr_NoMemory();
 159                 return NULL;
 160         }
 161
 162         lp_ctx = lpcfg_from_py_object(mem_ctx, py_lp_ctx);
 163         if (lp_ctx == NULL) {
 164                 talloc_free(mem_ctx);
 165                 return NULL;
 166         }
 167
 168         domain_sid = dom_sid_parse_talloc(mem_ctx, PyString_AsString(py_sid));
 169         if (domain_sid == NULL) {
 170                 PyErr_Format(PyExc_RuntimeError, "Unable to parse sid %s",
 171                                          PyString_AsString(py_sid));
 172                 talloc_free(mem_ctx);
 173                 return NULL;
 174         }
 175         session = admin_session(NULL, lp_ctx, domain_sid);
 176         talloc_free(mem_ctx);
 177
 178         return PyAuthSession_FromSession(session);
 179 }
 180
 181 static PyObject *py_user_session(PyObject *module, PyObject *args, PyObject *kwargs)
 182 {
 183         NTSTATUS nt_status;
 184         struct auth_session_info *session;
 185         TALLOC_CTX *mem_ctx;
 186         const char * const kwnames[] = { "ldb", "lp_ctx", "principal", "dn", "session_info_flags", NULL };
 187         struct ldb_context *ldb_ctx;
 188         PyObject *py_ldb = Py_None;
 189         PyObject *py_dn = Py_None;
 190         PyObject *py_lp_ctx = Py_None;
 191         struct loadparm_context *lp_ctx = NULL;
 192         struct ldb_dn *user_dn;
 193         char *principal = NULL;
 194         int session_info_flags = 0; /* This is an int, because that's
 195                                  * what we need for the python
 196                                  * PyArg_ParseTupleAndKeywords */
 197
 198         if (!PyArg_ParseTupleAndKeywords(args, kwargs, "O|OzOi",
 199                                          discard_const_p(char *, kwnames),
 200                                          &py_ldb, &py_lp_ctx, &principal, &py_dn, &session_info_flags)) {
 201                 return NULL;
 202         }
 203
 204         mem_ctx = talloc_new(NULL);
 205         if (mem_ctx == NULL) {
 206                 PyErr_NoMemory();
 207                 return NULL;
 208         }
 209
 210         ldb_ctx = PyLdb_AsLdbContext(py_ldb);
 211
 212         if (py_dn == Py_None) {
 213                 user_dn = NULL;
 214         } else {
 215                 if (!PyObject_AsDn(ldb_ctx, py_dn, ldb_ctx, &user_dn)) {
 216                         talloc_free(mem_ctx);
 217                         return NULL;
 218                 }
 219         }
 220
 221         lp_ctx = lpcfg_from_py_object(mem_ctx, py_lp_ctx);
 222         if (lp_ctx == NULL) {
 223                 talloc_free(mem_ctx);
 224                 return NULL;
 225         }
 226
 227         nt_status = authsam_get_session_info_principal(mem_ctx, lp_ctx, ldb_ctx, principal, user_dn,
 228                                                        session_info_flags, &session);
 229         if (!NT_STATUS_IS_OK(nt_status)) {
 230                 talloc_free(mem_ctx);
 231                 PyErr_NTSTATUS_IS_ERR_RAISE(nt_status);
 232         }
 233
 234         talloc_steal(NULL, session);
 235         talloc_free(mem_ctx);
 236
 237         return PyAuthSession_FromSession(session);
 238 }
 239
 240
 241 static const char **PyList_AsStringList(TALLOC_CTX *mem_ctx, PyObject *list,
 242                                         const char *paramname)
 243 {
 244         const char **ret;
 245         Py_ssize_t i;
 246         if (!PyList_Check(list)) {
 247                 PyErr_Format(PyExc_TypeError, "%s is not a list", paramname);
 248                 return NULL;
 249         }
 250         ret = talloc_array(NULL, const char *, PyList_Size(list)+1);
 251         if (ret == NULL) {
 252                 PyErr_NoMemory();
 253                 return NULL;
 254         }
 255
 256         for (i = 0; i < PyList_Size(list); i++) {
 257                 PyObject *item = PyList_GetItem(list, i);
 258                 if (!PyString_Check(item)) {
 259                         PyErr_Format(PyExc_TypeError, "%s should be strings", paramname);
 260                         return NULL;
 261                 }
 262                 ret[i] = talloc_strndup(ret, PyString_AsString(item),
 263                                         PyString_Size(item));
 264         }
 265         ret[i] = NULL;
 266         return ret;
 267 }
 268
 269 static PyObject *PyAuthContext_FromContext(struct auth_context *auth_context)
 270 {
 271         return py_talloc_reference(&PyAuthContext, auth_context);
 272 }
 273
 274 static PyObject *py_auth_context_new(PyTypeObject *type, PyObject *args, PyObject *kwargs)
 275 {
 276         PyObject *py_lp_ctx = Py_None;
 277         PyObject *py_ldb = Py_None;
 278         PyObject *py_messaging_ctx = Py_None;
 279         PyObject *py_auth_context = Py_None;
 280         PyObject *py_methods = Py_None;
 281         TALLOC_CTX *mem_ctx;
 282         struct auth_context *auth_context;
 283         struct messaging_context *messaging_context = NULL;
 284         struct loadparm_context *lp_ctx;
 285         struct tevent_context *ev;
 286         struct ldb_context *ldb;
 287         NTSTATUS nt_status;
 288         const char **methods;
 289
 290         const char * const kwnames[] = { "lp_ctx", "messaging_ctx", "ldb", "methods", NULL };
 291
 292         if (!PyArg_ParseTupleAndKeywords(args, kwargs, "|OOOO",
 293                                          discard_const_p(char *, kwnames),
 294                                          &py_lp_ctx, &py_messaging_ctx, &py_ldb, &py_methods))
 295                 return NULL;
 296
 297         mem_ctx = talloc_new(NULL);
 298         if (mem_ctx == NULL) {
 299                 PyErr_NoMemory();
 300                 return NULL;
 301         }
 302
 303         if (py_ldb != Py_None) {
 304                 ldb = PyLdb_AsLdbContext(py_ldb);
 305         }
 306
 307         lp_ctx = lpcfg_from_py_object(mem_ctx, py_lp_ctx);
 308
 309         ev = tevent_context_init(mem_ctx);
 310         if (ev == NULL) {
 311                 PyErr_NoMemory();
 312                 return NULL;
 313         }
 314
 315         if (py_messaging_ctx != Py_None) {
 316                 messaging_context = py_talloc_get_type(py_messaging_ctx, struct messaging_context);
 317         }
 318
 319         if (py_methods == Py_None && py_ldb == Py_None) {
 320                 nt_status = auth_context_create(mem_ctx, ev, messaging_context, lp_ctx, &auth_context);
 321         } else {
 322                 if (py_methods != Py_None) {
 323                         methods = PyList_AsStringList(mem_ctx, py_methods, "methods");
 324                         if (methods == NULL) {
 325                                 talloc_free(mem_ctx);
 326                                 return NULL;
 327                         }
 328                 } else {
 329                         methods = auth_methods_from_lp(mem_ctx, lp_ctx);
 330                 }
 331                 nt_status = auth_context_create_methods(mem_ctx, methods, ev,
 332                                                         messaging_context, lp_ctx,
 333                                                         ldb, &auth_context);
 334         }
 335
 336         if (!NT_STATUS_IS_OK(nt_status)) {
 337                 talloc_free(mem_ctx);
 338                 PyErr_NTSTATUS_IS_ERR_RAISE(nt_status);
 339         }
 340
 341         if (!talloc_reference(auth_context, lp_ctx)) {
 342                 talloc_free(mem_ctx);
 343                 PyErr_NoMemory();
 344                 return NULL;
 345         }
 346
 347         if (!talloc_reference(auth_context, ev)) {
 348                 talloc_free(mem_ctx);
 349                 PyErr_NoMemory();
 350                 return NULL;
 351         }
 352
 353         py_auth_context = PyAuthContext_FromContext(auth_context);
 354
 355         talloc_free(mem_ctx);
 356
 357         return py_auth_context;
 358 }
 359
 360 static PyTypeObject PyAuthContext = {
 361         .tp_name = "AuthContext",
 362         .tp_basicsize = sizeof(py_talloc_Object),
 363         .tp_flags = Py_TPFLAGS_DEFAULT,
 364         .tp_new = py_auth_context_new,
 365         .tp_basicsize = sizeof(py_talloc_Object),
 366 };
 367
 368 static PyMethodDef py_auth_methods[] = {
 369         { "system_session", (PyCFunction)py_system_session, METH_VARARGS, NULL },
 370         { "admin_session", (PyCFunction)py_admin_session, METH_VARARGS, NULL },
 371         { "user_session", (PyCFunction)py_user_session, METH_VARARGS|METH_KEYWORDS, NULL },
 372         { NULL },
 373 };
 374
 375 void initauth(void)
 376 {
 377         PyObject *m;
 378
 379         PyAuthSession.tp_base = PyTalloc_GetObjectType();
 380         if (PyAuthSession.tp_base == NULL)
 381                 return;
 382
 383         if (PyType_Ready(&PyAuthSession) < 0)
 384                 return;
 385
 386         PyAuthContext.tp_base = PyTalloc_GetObjectType();
 387         if (PyAuthContext.tp_base == NULL)
 388                 return;
 389
 390         if (PyType_Ready(&PyAuthContext) < 0)
 391                 return;
 392
 393         m = Py_InitModule3("auth", py_auth_methods,
 394                                            "Authentication and authorization support.");
 395         if (m == NULL)
 396                 return;
 397
 398         Py_INCREF(&PyAuthSession);
 399         PyModule_AddObject(m, "AuthSession", (PyObject *)&PyAuthSession);
 400         Py_INCREF(&PyAuthContext);
 401         PyModule_AddObject(m, "AuthContext", (PyObject *)&PyAuthContext);
 402
 403 #define ADD_FLAG(val)  PyModule_AddObject(m, #val, PyInt_FromLong(val))
 404         ADD_FLAG(AUTH_SESSION_INFO_DEFAULT_GROUPS);
 405         ADD_FLAG(AUTH_SESSION_INFO_AUTHENTICATED);
 406         ADD_FLAG(AUTH_SESSION_INFO_SIMPLE_PRIVILEGES);
 407
 408 }