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 "python/py3compat.h"
  22 #include "includes.h"
  23 #include "libcli/util/pyerrors.h"
  24 #include "param/param.h"
  25 #include "pyauth.h"
  26 #include "pyldb.h"
  27 #include "auth/system_session_proto.h"
  28 #include "auth/auth.h"
  29 #include "param/pyparam.h"
  30 #include "libcli/security/security.h"
  31 #include "auth/credentials/pycredentials.h"
  32 #include <tevent.h>
  33 #include "librpc/rpc/pyrpc_util.h"
  34 #include "lib/events/events.h"
  35
  36 static PyTypeObject PyAuthContext;
  37
  38 static PyObject *PyAuthSession_FromSession(struct auth_session_info *session)
  39 {
  40         return py_return_ndr_struct("samba.dcerpc.auth", "session_info", session, session);
  41 }
  42
  43 static PyObject *py_system_session(PyObject *module, PyObject *args)
  44 {
  45         PyObject *py_lp_ctx = Py_None;
  46         struct loadparm_context *lp_ctx = NULL;
  47         struct auth_session_info *session;
  48         TALLOC_CTX *mem_ctx;
  49         if (!PyArg_ParseTuple(args, "|O", &py_lp_ctx))
  50                 return NULL;
  51
  52         mem_ctx = talloc_new(NULL);
  53         if (mem_ctx == NULL) {
  54                 PyErr_NoMemory();
  55                 return NULL;
  56         }
  57
  58         lp_ctx = lpcfg_from_py_object(mem_ctx, py_lp_ctx);
  59         if (lp_ctx == NULL) {
  60                 talloc_free(mem_ctx);
  61                 return NULL;
  62         }
  63
  64         session = system_session(lp_ctx);
  65
  66         talloc_free(mem_ctx);
  67
  68         return PyAuthSession_FromSession(session);
  69 }
  70
  71
  72 static PyObject *py_admin_session(PyObject *module, PyObject *args)
  73 {
  74         PyObject *py_lp_ctx;
  75         const char *sid;
  76         struct loadparm_context *lp_ctx = NULL;
  77         struct auth_session_info *session;
  78         struct dom_sid *domain_sid = NULL;
  79         TALLOC_CTX *mem_ctx;
  80
  81         if (!PyArg_ParseTuple(args, "Os", &py_lp_ctx, &sid))
  82                 return NULL;
  83
  84         mem_ctx = talloc_new(NULL);
  85         if (mem_ctx == NULL) {
  86                 PyErr_NoMemory();
  87                 return NULL;
  88         }
  89
  90         lp_ctx = lpcfg_from_py_object(mem_ctx, py_lp_ctx);
  91         if (lp_ctx == NULL) {
  92                 talloc_free(mem_ctx);
  93                 return NULL;
  94         }
  95
  96         domain_sid = dom_sid_parse_talloc(mem_ctx, sid);
  97         if (domain_sid == NULL) {
  98                 PyErr_Format(PyExc_RuntimeError, "Unable to parse sid %s", sid);
  99                 talloc_free(mem_ctx);
 100                 return NULL;
 101         }
 102         session = admin_session(NULL, lp_ctx, domain_sid);
 103         talloc_free(mem_ctx);
 104
 105         return PyAuthSession_FromSession(session);
 106 }
 107
 108 static PyObject *py_user_session(PyObject *module, PyObject *args, PyObject *kwargs)
 109 {
 110         NTSTATUS nt_status;
 111         struct auth_session_info *session;
 112         TALLOC_CTX *mem_ctx;
 113         const char * const kwnames[] = { "ldb", "lp_ctx", "principal", "dn", "session_info_flags", NULL };
 114         struct ldb_context *ldb_ctx;
 115         PyObject *py_ldb = Py_None;
 116         PyObject *py_dn = Py_None;
 117         PyObject *py_lp_ctx = Py_None;
 118         struct loadparm_context *lp_ctx = NULL;
 119         struct ldb_dn *user_dn;
 120         char *principal = NULL;
 121         int session_info_flags = 0; /* This is an int, because that's
 122                                  * what we need for the python
 123                                  * PyArg_ParseTupleAndKeywords */
 124
 125         if (!PyArg_ParseTupleAndKeywords(args, kwargs, "O|OzOi",
 126                                          discard_const_p(char *, kwnames),
 127                                          &py_ldb, &py_lp_ctx, &principal, &py_dn, &session_info_flags)) {
 128                 return NULL;
 129         }
 130
 131         mem_ctx = talloc_new(NULL);
 132         if (mem_ctx == NULL) {
 133                 PyErr_NoMemory();
 134                 return NULL;
 135         }
 136
 137         ldb_ctx = pyldb_Ldb_AsLdbContext(py_ldb);
 138
 139         if (py_dn == Py_None) {
 140                 user_dn = NULL;
 141         } else {
 142                 if (!pyldb_Object_AsDn(ldb_ctx, py_dn, ldb_ctx, &user_dn)) {
 143                         talloc_free(mem_ctx);
 144                         return NULL;
 145                 }
 146         }
 147
 148         lp_ctx = lpcfg_from_py_object(mem_ctx, py_lp_ctx);
 149         if (lp_ctx == NULL) {
 150                 talloc_free(mem_ctx);
 151                 return NULL;
 152         }
 153
 154         nt_status = authsam_get_session_info_principal(mem_ctx, lp_ctx, ldb_ctx, principal, user_dn,
 155                                                        session_info_flags, &session);
 156         if (!NT_STATUS_IS_OK(nt_status)) {
 157                 talloc_free(mem_ctx);
 158                 PyErr_NTSTATUS_IS_ERR_RAISE(nt_status);
 159         }
 160
 161         talloc_steal(NULL, session);
 162         talloc_free(mem_ctx);
 163
 164         return PyAuthSession_FromSession(session);
 165 }
 166
 167 static PyObject *py_session_info_fill_unix(PyObject *module,
 168                                            PyObject *args,
 169                                            PyObject *kwargs)
 170 {
 171         NTSTATUS nt_status;
 172         char *user_name = NULL;
 173         struct loadparm_context *lp_ctx = NULL;
 174         struct auth_session_info *session_info;
 175         PyObject *py_lp_ctx = Py_None;
 176         PyObject *py_session = Py_None;
 177         TALLOC_CTX *frame;
 178
 179         const char * const kwnames[] = { "session_info",
 180                                          "user_name",
 181                                          "lp_ctx",
 182                                          NULL };
 183         if (!PyArg_ParseTupleAndKeywords(args, kwargs, "Oz|O",
 184                                          discard_const_p(char *, kwnames),
 185                                          &py_session,
 186                                          &user_name,
 187                                          &py_lp_ctx)) {
 188                 return NULL;
 189         }
 190
 191         if (!py_check_dcerpc_type(py_session,
 192                                   "samba.dcerpc.auth",
 193                                   "session_info")) {
 194                 return NULL;
 195         }
 196         session_info = pytalloc_get_type(py_session,
 197                                          struct auth_session_info);
 198         if (!session_info) {
 199                 PyErr_Format(PyExc_TypeError,
 200                              "Expected auth_session_info for session_info argument got %s",
 201                              talloc_get_name(pytalloc_get_ptr(py_session)));
 202                 return NULL;
 203         }
 204
 205         frame = talloc_stackframe();
 206
 207         lp_ctx = lpcfg_from_py_object(frame, py_lp_ctx);
 208         if (lp_ctx == NULL) {
 209                 TALLOC_FREE(frame);
 210                 return NULL;
 211         }
 212
 213         nt_status = auth_session_info_fill_unix(lp_ctx,
 214                                                user_name,
 215                                                session_info);
 216         TALLOC_FREE(frame);
 217         if (!NT_STATUS_IS_OK(nt_status)) {
 218                 PyErr_NTSTATUS_IS_ERR_RAISE(nt_status);
 219         }
 220
 221         Py_RETURN_NONE;
 222 }
 223
 224
 225 static const char **PyList_AsStringList(TALLOC_CTX *mem_ctx, PyObject *list,
 226                                         const char *paramname)
 227 {
 228         const char **ret;
 229         Py_ssize_t i;
 230         if (!PyList_Check(list)) {
 231                 PyErr_Format(PyExc_TypeError, "%s is not a list", paramname);
 232                 return NULL;
 233         }
 234         ret = talloc_array(NULL, const char *, PyList_Size(list)+1);
 235         if (ret == NULL) {
 236                 PyErr_NoMemory();
 237                 return NULL;
 238         }
 239
 240         for (i = 0; i < PyList_Size(list); i++) {
 241                 const char *value;
 242                 Py_ssize_t size;
 243                 PyObject *item = PyList_GetItem(list, i);
 244                 if (!(PyStr_Check(item) || PyUnicode_Check(item))) {
 245                         PyErr_Format(PyExc_TypeError, "%s should be strings", paramname);
 246                         return NULL;
 247                 }
 248                 value = PyStr_AsUTF8AndSize(item, &size);
 249                 if (value == NULL) {
 250                         talloc_free(ret);
 251                         return NULL;
 252                 }
 253                 ret[i] = talloc_strndup(ret, value, size);
 254         }
 255         ret[i] = NULL;
 256         return ret;
 257 }
 258
 259 static PyObject *PyAuthContext_FromContext(struct auth4_context *auth_context)
 260 {
 261         return pytalloc_reference(&PyAuthContext, auth_context);
 262 }
 263
 264 static PyObject *py_auth_context_new(PyTypeObject *type, PyObject *args, PyObject *kwargs)
 265 {
 266         PyObject *py_lp_ctx = Py_None;
 267         PyObject *py_ldb = Py_None;
 268         PyObject *py_imessaging_ctx = Py_None;
 269         PyObject *py_auth_context = Py_None;
 270         PyObject *py_methods = Py_None;
 271         TALLOC_CTX *mem_ctx;
 272         struct auth4_context *auth_context;
 273         struct imessaging_context *imessaging_context = NULL;
 274         struct loadparm_context *lp_ctx;
 275         struct tevent_context *ev;
 276         struct ldb_context *ldb = NULL;
 277         NTSTATUS nt_status;
 278         const char **methods;
 279
 280         const char * const kwnames[] = { "lp_ctx", "messaging_ctx", "ldb", "methods", NULL };
 281
 282         if (!PyArg_ParseTupleAndKeywords(args, kwargs, "|OOOO",
 283                                          discard_const_p(char *, kwnames),
 284                                          &py_lp_ctx, &py_imessaging_ctx, &py_ldb, &py_methods))
 285                 return NULL;
 286
 287         mem_ctx = talloc_new(NULL);
 288         if (mem_ctx == NULL) {
 289                 PyErr_NoMemory();
 290                 return NULL;
 291         }
 292
 293         if (py_ldb != Py_None) {
 294                 ldb = pyldb_Ldb_AsLdbContext(py_ldb);
 295         }
 296
 297         lp_ctx = lpcfg_from_py_object(mem_ctx, py_lp_ctx);
 298         if (lp_ctx == NULL) {
 299                 PyErr_NoMemory();
 300                 return NULL;
 301         }
 302
 303         ev = s4_event_context_init(mem_ctx);
 304         if (ev == NULL) {
 305                 PyErr_NoMemory();
 306                 return NULL;
 307         }
 308
 309         if (py_imessaging_ctx != Py_None) {
 310                 imessaging_context = pytalloc_get_type(py_imessaging_ctx, struct imessaging_context);
 311         }
 312
 313         if (py_methods == Py_None && py_ldb == Py_None) {
 314                 nt_status = auth_context_create(mem_ctx, ev, imessaging_context, lp_ctx, &auth_context);
 315         } else {
 316                 if (py_methods != Py_None) {
 317                         methods = PyList_AsStringList(mem_ctx, py_methods, "methods");
 318                         if (methods == NULL) {
 319                                 talloc_free(mem_ctx);
 320                                 return NULL;
 321                         }
 322                 } else {
 323                         methods = auth_methods_from_lp(mem_ctx, lp_ctx);
 324                 }
 325                 nt_status = auth_context_create_methods(mem_ctx, methods, ev,
 326                                                         imessaging_context, lp_ctx,
 327                                                         ldb, &auth_context);
 328         }
 329
 330         if (!NT_STATUS_IS_OK(nt_status)) {
 331                 talloc_free(mem_ctx);
 332                 PyErr_NTSTATUS_IS_ERR_RAISE(nt_status);
 333         }
 334
 335         if (!talloc_reference(auth_context, lp_ctx)) {
 336                 talloc_free(mem_ctx);
 337                 PyErr_NoMemory();
 338                 return NULL;
 339         }
 340
 341         if (!talloc_reference(auth_context, ev)) {
 342                 talloc_free(mem_ctx);
 343                 PyErr_NoMemory();
 344                 return NULL;
 345         }
 346
 347         py_auth_context = PyAuthContext_FromContext(auth_context);
 348
 349         talloc_free(mem_ctx);
 350
 351         return py_auth_context;
 352 }
 353
 354 static PyTypeObject PyAuthContext = {
 355         .tp_name = "AuthContext",
 356         .tp_flags = Py_TPFLAGS_DEFAULT,
 357         .tp_new = py_auth_context_new,
 358 };
 359
 360 static PyMethodDef py_auth_methods[] = {
 361         { "system_session", (PyCFunction)py_system_session, METH_VARARGS, NULL },
 362         { "admin_session", (PyCFunction)py_admin_session, METH_VARARGS, NULL },
 363         { "user_session", (PyCFunction)py_user_session, METH_VARARGS|METH_KEYWORDS, NULL },
 364         { "session_info_fill_unix",
 365           (PyCFunction)py_session_info_fill_unix,
 366           METH_VARARGS|METH_KEYWORDS,
 367           NULL },
 368         { NULL },
 369 };
 370
 371 static struct PyModuleDef moduledef = {
 372         PyModuleDef_HEAD_INIT,
 373         .m_name = "auth",
 374         .m_doc = "Authentication and authorization support.",
 375         .m_size = -1,
 376         .m_methods = py_auth_methods,
 377 };
 378
 379 MODULE_INIT_FUNC(auth)
 380 {
 381         PyObject *m;
 382
 383         if (pytalloc_BaseObject_PyType_Ready(&PyAuthContext) < 0)
 384                 return NULL;
 385
 386         m = PyModule_Create(&moduledef);
 387         if (m == NULL)
 388                 return NULL;
 389
 390         Py_INCREF(&PyAuthContext);
 391         PyModule_AddObject(m, "AuthContext", (PyObject *)&PyAuthContext);
 392
 393 #define ADD_FLAG(val)  PyModule_AddIntConstant(m, #val, val)
 394         ADD_FLAG(AUTH_SESSION_INFO_DEFAULT_GROUPS);
 395         ADD_FLAG(AUTH_SESSION_INFO_AUTHENTICATED);
 396         ADD_FLAG(AUTH_SESSION_INFO_SIMPLE_PRIVILEGES);
 397         ADD_FLAG(AUTH_SESSION_INFO_NTLM);
 398
 399         return m;
 400 }