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 static PyObject *py_auth_session_get_security_token(PyObject *self, void *closure)
  37 {
  38         struct auth_session_info *session = py_talloc_get_type(self, struct auth_session_info);
  39         PyObject *py_security_token;
  40         py_security_token = py_return_ndr_struct("samba.dcerpc.security", "token",
  41                                                  session->security_token, session->security_token);
  42         return py_security_token;
  43 }
  44
  45 static int py_auth_session_set_security_token(PyObject *self, PyObject *value, void *closure)
  46 {
  47         struct auth_session_info *session = py_talloc_get_type(self, struct auth_session_info);
  48         session->security_token = talloc_reference(session, py_talloc_get_ptr(value));
  49         return 0;
  50 }
  51
  52 static PyObject *py_auth_session_get_session_key(PyObject *self, void *closure)
  53 {
  54         struct auth_session_info *session = py_talloc_get_type(self, struct auth_session_info);
  55         return PyString_FromStringAndSize((char *)session->session_key.data, session->session_key.length);
  56 }
  57
  58 static int py_auth_session_set_session_key(PyObject *self, PyObject *value, void *closure)
  59 {
  60         DATA_BLOB val;
  61         struct auth_session_info *session = py_talloc_get_type(self, struct auth_session_info);
  62         val.data = (uint8_t *)PyString_AsString(value);
  63         val.length = PyString_Size(value);
  64
  65         session->session_key = data_blob_talloc(session, val.data, val.length);
  66         return 0;
  67 }
  68
  69 static PyObject *py_auth_session_get_credentials(PyObject *self, void *closure)
  70 {
  71         struct auth_session_info *session = py_talloc_get_type(self, struct auth_session_info);
  72         PyObject *py_credentials;
  73         /* This is evil, as the credentials are not IDL structures */
  74         py_credentials = py_return_ndr_struct("samba.credentials", "Credentials", session->credentials, session->credentials);
  75         return py_credentials;
  76 }
  77
  78 static int py_auth_session_set_credentials(PyObject *self, PyObject *value, void *closure)
  79 {
  80         struct auth_session_info *session = py_talloc_get_type(self, struct auth_session_info);
  81         session->credentials = talloc_reference(session, PyCredentials_AsCliCredentials(value));
  82         return 0;
  83 }
  84
  85 static PyGetSetDef py_auth_session_getset[] = {
  86         { discard_const_p(char, "security_token"), (getter)py_auth_session_get_security_token, (setter)py_auth_session_set_security_token, NULL },
  87         { discard_const_p(char, "session_key"), (getter)py_auth_session_get_session_key, (setter)py_auth_session_set_session_key, NULL },
  88         { discard_const_p(char, "credentials"), (getter)py_auth_session_get_credentials, (setter)py_auth_session_set_credentials, NULL },
  89         { NULL }
  90 };
  91
  92 static PyTypeObject PyAuthSession = {
  93         .tp_name = "AuthSession",
  94         .tp_basicsize = sizeof(py_talloc_Object),
  95         .tp_flags = Py_TPFLAGS_DEFAULT,
  96         .tp_getset = py_auth_session_getset,
  97 };
  98
  99 PyObject *PyAuthSession_FromSession(struct auth_session_info *session)
 100 {
 101         return py_talloc_reference(&PyAuthSession, session);
 102 }
 103
 104 static PyObject *py_system_session(PyObject *module, PyObject *args)
 105 {
 106         PyObject *py_lp_ctx = Py_None;
 107         struct loadparm_context *lp_ctx = NULL;
 108         struct auth_session_info *session;
 109         TALLOC_CTX *mem_ctx;
 110         if (!PyArg_ParseTuple(args, "|O", &py_lp_ctx))
 111                 return NULL;
 112
 113         mem_ctx = talloc_new(NULL);
 114         if (mem_ctx == NULL) {
 115                 PyErr_NoMemory();
 116                 return NULL;
 117         }
 118
 119         lp_ctx = lpcfg_from_py_object(mem_ctx, py_lp_ctx);
 120         if (lp_ctx == NULL) {
 121                 talloc_free(mem_ctx);
 122                 return NULL;
 123         }
 124
 125         session = system_session(lp_ctx);
 126
 127         talloc_free(mem_ctx);
 128
 129         return PyAuthSession_FromSession(session);
 130 }
 131
 132
 133 static PyObject *py_admin_session(PyObject *module, PyObject *args)
 134 {
 135         PyObject *py_lp_ctx;
 136         PyObject *py_sid;
 137         struct loadparm_context *lp_ctx = NULL;
 138         struct auth_session_info *session;
 139         struct dom_sid *domain_sid = NULL;
 140         TALLOC_CTX *mem_ctx;
 141
 142         if (!PyArg_ParseTuple(args, "OO", &py_lp_ctx, &py_sid))
 143                 return NULL;
 144
 145         mem_ctx = talloc_new(NULL);
 146         if (mem_ctx == NULL) {
 147                 PyErr_NoMemory();
 148                 return NULL;
 149         }
 150
 151         lp_ctx = lpcfg_from_py_object(mem_ctx, py_lp_ctx);
 152         if (lp_ctx == NULL) {
 153                 talloc_free(mem_ctx);
 154                 return NULL;
 155         }
 156
 157         domain_sid = dom_sid_parse_talloc(mem_ctx, PyString_AsString(py_sid));
 158         if (domain_sid == NULL) {
 159                 PyErr_Format(PyExc_RuntimeError, "Unable to parse sid %s",
 160                                          PyString_AsString(py_sid));
 161                 talloc_free(mem_ctx);
 162                 return NULL;
 163         }
 164         session = admin_session(NULL, lp_ctx, domain_sid);
 165         talloc_free(mem_ctx);
 166
 167         return PyAuthSession_FromSession(session);
 168 }
 169
 170 static PyObject *py_user_session(PyObject *module, PyObject *args, PyObject *kwargs)
 171 {
 172         NTSTATUS nt_status;
 173         struct auth_session_info *session;
 174         TALLOC_CTX *mem_ctx;
 175         const char * const kwnames[] = { "ldb", "lp_ctx", "principal", "dn", "session_info_flags", NULL };
 176         struct ldb_context *ldb_ctx;
 177         PyObject *py_ldb = Py_None;
 178         PyObject *py_dn = Py_None;
 179         PyObject *py_lp_ctx = Py_None;
 180         struct loadparm_context *lp_ctx = NULL;
 181         struct ldb_dn *user_dn;
 182         char *principal = NULL;
 183         int session_info_flags = 0; /* This is an int, because that's
 184                                  * what we need for the python
 185                                  * PyArg_ParseTupleAndKeywords */
 186
 187         if (!PyArg_ParseTupleAndKeywords(args, kwargs, "O|OzOi",
 188                                          discard_const_p(char *, kwnames),
 189                                          &py_ldb, &py_lp_ctx, &principal, &py_dn, &session_info_flags)) {
 190                 return NULL;
 191         }
 192
 193         mem_ctx = talloc_new(NULL);
 194         if (mem_ctx == NULL) {
 195                 PyErr_NoMemory();
 196                 return NULL;
 197         }
 198
 199         ldb_ctx = PyLdb_AsLdbContext(py_ldb);
 200
 201         if (py_dn == Py_None) {
 202                 user_dn = NULL;
 203         } else {
 204                 if (!PyObject_AsDn(ldb_ctx, py_dn, ldb_ctx, &user_dn)) {
 205                         talloc_free(mem_ctx);
 206                         return NULL;
 207                 }
 208         }
 209
 210         lp_ctx = lpcfg_from_py_object(mem_ctx, py_lp_ctx);
 211         if (lp_ctx == NULL) {
 212                 talloc_free(mem_ctx);
 213                 return NULL;
 214         }
 215
 216         nt_status = authsam_get_session_info_principal(mem_ctx, lp_ctx, ldb_ctx, principal, user_dn,
 217                                                        session_info_flags, &session);
 218         if (!NT_STATUS_IS_OK(nt_status)) {
 219                 talloc_free(mem_ctx);
 220                 PyErr_NTSTATUS_IS_ERR_RAISE(nt_status);
 221         }
 222
 223         talloc_steal(NULL, session);
 224         talloc_free(mem_ctx);
 225
 226         return PyAuthSession_FromSession(session);
 227 }
 228
 229
 230 static const char **PyList_AsStringList(TALLOC_CTX *mem_ctx, PyObject *list,
 231                                         const char *paramname)
 232 {
 233         const char **ret;
 234         Py_ssize_t i;
 235         if (!PyList_Check(list)) {
 236                 PyErr_Format(PyExc_TypeError, "%s is not a list", paramname);
 237                 return NULL;
 238         }
 239         ret = talloc_array(NULL, const char *, PyList_Size(list)+1);
 240         if (ret == NULL) {
 241                 PyErr_NoMemory();
 242                 return NULL;
 243         }
 244
 245         for (i = 0; i < PyList_Size(list); i++) {
 246                 PyObject *item = PyList_GetItem(list, i);
 247                 if (!PyString_Check(item)) {
 248                         PyErr_Format(PyExc_TypeError, "%s should be strings", paramname);
 249                         return NULL;
 250                 }
 251                 ret[i] = talloc_strndup(ret, PyString_AsString(item),
 252                                         PyString_Size(item));
 253         }
 254         ret[i] = NULL;
 255         return ret;
 256 }
 257
 258 static PyObject *PyAuthContext_FromContext(struct auth_context *auth_context)
 259 {
 260         return py_talloc_reference(&PyAuthContext, auth_context);
 261 }
 262
 263 static PyObject *py_auth_context_new(PyTypeObject *type, PyObject *args, PyObject *kwargs)
 264 {
 265         PyObject *py_lp_ctx = Py_None;
 266         PyObject *py_ldb = Py_None;
 267         PyObject *py_messaging_ctx = Py_None;
 268         PyObject *py_auth_context = Py_None;
 269         PyObject *py_methods = Py_None;
 270         TALLOC_CTX *mem_ctx;
 271         struct auth_context *auth_context;
 272         struct messaging_context *messaging_context = NULL;
 273         struct loadparm_context *lp_ctx;
 274         struct tevent_context *ev;
 275         struct ldb_context *ldb;
 276         NTSTATUS nt_status;
 277         const char **methods;
 278
 279         const char * const kwnames[] = { "lp_ctx", "messaging_ctx", "ldb", "methods", NULL };
 280
 281         if (!PyArg_ParseTupleAndKeywords(args, kwargs, "|OOOO",
 282                                          discard_const_p(char *, kwnames),
 283                                          &py_lp_ctx, &py_messaging_ctx, &py_ldb, &py_methods))
 284                 return NULL;
 285
 286         mem_ctx = talloc_new(NULL);
 287         if (mem_ctx == NULL) {
 288                 PyErr_NoMemory();
 289                 return NULL;
 290         }
 291
 292         if (py_ldb != Py_None) {
 293                 ldb = PyLdb_AsLdbContext(py_ldb);
 294         }
 295
 296         lp_ctx = lpcfg_from_py_object(mem_ctx, py_lp_ctx);
 297
 298         ev = tevent_context_init(mem_ctx);
 299         if (ev == NULL) {
 300                 PyErr_NoMemory();
 301                 return NULL;
 302         }
 303
 304         if (py_messaging_ctx != Py_None) {
 305                 messaging_context = py_talloc_get_type(py_messaging_ctx, struct messaging_context);
 306         }
 307
 308         if (py_methods == Py_None && py_ldb == Py_None) {
 309                 nt_status = auth_context_create(mem_ctx, ev, messaging_context, lp_ctx, &auth_context);
 310         } else {
 311                 if (py_methods != Py_None) {
 312                         methods = PyList_AsStringList(mem_ctx, py_methods, "methods");
 313                         if (methods == NULL) {
 314                                 talloc_free(mem_ctx);
 315                                 return NULL;
 316                         }
 317                 } else {
 318                         methods = auth_methods_from_lp(mem_ctx, lp_ctx);
 319                 }
 320                 nt_status = auth_context_create_methods(mem_ctx, methods, ev,
 321                                                         messaging_context, lp_ctx,
 322                                                         ldb, &auth_context);
 323         }
 324
 325         if (!NT_STATUS_IS_OK(nt_status)) {
 326                 talloc_free(mem_ctx);
 327                 PyErr_NTSTATUS_IS_ERR_RAISE(nt_status);
 328         }
 329
 330         if (!talloc_reference(auth_context, lp_ctx)) {
 331                 talloc_free(mem_ctx);
 332                 PyErr_NoMemory();
 333                 return NULL;
 334         }
 335
 336         if (!talloc_reference(auth_context, ev)) {
 337                 talloc_free(mem_ctx);
 338                 PyErr_NoMemory();
 339                 return NULL;
 340         }
 341
 342         py_auth_context = PyAuthContext_FromContext(auth_context);
 343
 344         talloc_free(mem_ctx);
 345
 346         return py_auth_context;
 347 }
 348
 349 static PyTypeObject PyAuthContext = {
 350         .tp_name = "AuthContext",
 351         .tp_basicsize = sizeof(py_talloc_Object),
 352         .tp_flags = Py_TPFLAGS_DEFAULT,
 353         .tp_new = py_auth_context_new,
 354         .tp_basicsize = sizeof(py_talloc_Object),
 355 };
 356
 357 static PyMethodDef py_auth_methods[] = {
 358         { "system_session", (PyCFunction)py_system_session, METH_VARARGS, NULL },
 359         { "admin_session", (PyCFunction)py_admin_session, METH_VARARGS, NULL },
 360         { "user_session", (PyCFunction)py_user_session, METH_VARARGS|METH_KEYWORDS, NULL },
 361         { NULL },
 362 };
 363
 364 void initauth(void)
 365 {
 366         PyObject *m;
 367
 368         PyAuthSession.tp_base = PyTalloc_GetObjectType();
 369         if (PyAuthSession.tp_base == NULL)
 370                 return;
 371
 372         if (PyType_Ready(&PyAuthSession) < 0)
 373                 return;
 374
 375         PyAuthContext.tp_base = PyTalloc_GetObjectType();
 376         if (PyAuthContext.tp_base == NULL)
 377                 return;
 378
 379         if (PyType_Ready(&PyAuthContext) < 0)
 380                 return;
 381
 382         m = Py_InitModule3("auth", py_auth_methods,
 383                                            "Authentication and authorization support.");
 384         if (m == NULL)
 385                 return;
 386
 387         Py_INCREF(&PyAuthSession);
 388         PyModule_AddObject(m, "AuthSession", (PyObject *)&PyAuthSession);
 389         Py_INCREF(&PyAuthContext);
 390         PyModule_AddObject(m, "AuthContext", (PyObject *)&PyAuthContext);
 391
 392 #define ADD_FLAG(val)  PyModule_AddObject(m, #val, PyInt_FromLong(val))
 393         ADD_FLAG(AUTH_SESSION_INFO_DEFAULT_GROUPS);
 394         ADD_FLAG(AUTH_SESSION_INFO_AUTHENTICATED);
 395         ADD_FLAG(AUTH_SESSION_INFO_SIMPLE_PRIVILEGES);
 396
 397 }