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 #include "lib/events/events.h"
  34
  35 void initauth(void);
  36
  37 staticforward PyTypeObject PyAuthContext;
  38
  39 /* There's no Py_ssize_t in 2.4, apparently */
  40 #if PY_MAJOR_VERSION == 2 && PY_MINOR_VERSION < 5
  41 typedef int Py_ssize_t;
  42 typedef inquiry lenfunc;
  43 typedef intargfunc ssizeargfunc;
  44 #endif
  45
  46 #ifndef Py_RETURN_NONE
  47 #define Py_RETURN_NONE return Py_INCREF(Py_None), Py_None
  48 #endif
  49
  50 static PyObject *PyAuthSession_FromSession(struct auth_session_info *session)
  51 {
  52         return py_return_ndr_struct("samba.dcerpc.auth", "session_info", session, session);
  53 }
  54
  55 static PyObject *py_system_session(PyObject *module, PyObject *args)
  56 {
  57         PyObject *py_lp_ctx = Py_None;
  58         struct loadparm_context *lp_ctx = NULL;
  59         struct auth_session_info *session;
  60         TALLOC_CTX *mem_ctx;
  61         if (!PyArg_ParseTuple(args, "|O", &py_lp_ctx))
  62                 return NULL;
  63
  64         mem_ctx = talloc_new(NULL);
  65         if (mem_ctx == NULL) {
  66                 PyErr_NoMemory();
  67                 return NULL;
  68         }
  69
  70         lp_ctx = lpcfg_from_py_object(mem_ctx, py_lp_ctx);
  71         if (lp_ctx == NULL) {
  72                 talloc_free(mem_ctx);
  73                 return NULL;
  74         }
  75
  76         session = system_session(lp_ctx);
  77
  78         talloc_free(mem_ctx);
  79
  80         return PyAuthSession_FromSession(session);
  81 }
  82
  83
  84 static PyObject *py_admin_session(PyObject *module, PyObject *args)
  85 {
  86         PyObject *py_lp_ctx;
  87         PyObject *py_sid;
  88         struct loadparm_context *lp_ctx = NULL;
  89         struct auth_session_info *session;
  90         struct dom_sid *domain_sid = NULL;
  91         TALLOC_CTX *mem_ctx;
  92
  93         if (!PyArg_ParseTuple(args, "OO", &py_lp_ctx, &py_sid))
  94                 return NULL;
  95
  96         mem_ctx = talloc_new(NULL);
  97         if (mem_ctx == NULL) {
  98                 PyErr_NoMemory();
  99                 return NULL;
 100         }
 101
 102         lp_ctx = lpcfg_from_py_object(mem_ctx, py_lp_ctx);
 103         if (lp_ctx == NULL) {
 104                 talloc_free(mem_ctx);
 105                 return NULL;
 106         }
 107
 108         domain_sid = dom_sid_parse_talloc(mem_ctx, PyString_AsString(py_sid));
 109         if (domain_sid == NULL) {
 110                 PyErr_Format(PyExc_RuntimeError, "Unable to parse sid %s",
 111                                          PyString_AsString(py_sid));
 112                 talloc_free(mem_ctx);
 113                 return NULL;
 114         }
 115         session = admin_session(NULL, lp_ctx, domain_sid);
 116         talloc_free(mem_ctx);
 117
 118         return PyAuthSession_FromSession(session);
 119 }
 120
 121 static PyObject *py_user_session(PyObject *module, PyObject *args, PyObject *kwargs)
 122 {
 123         NTSTATUS nt_status;
 124         struct auth_session_info *session;
 125         TALLOC_CTX *mem_ctx;
 126         const char * const kwnames[] = { "ldb", "lp_ctx", "principal", "dn", "session_info_flags", NULL };
 127         struct ldb_context *ldb_ctx;
 128         PyObject *py_ldb = Py_None;
 129         PyObject *py_dn = Py_None;
 130         PyObject *py_lp_ctx = Py_None;
 131         struct loadparm_context *lp_ctx = NULL;
 132         struct ldb_dn *user_dn;
 133         char *principal = NULL;
 134         int session_info_flags = 0; /* This is an int, because that's
 135                                  * what we need for the python
 136                                  * PyArg_ParseTupleAndKeywords */
 137
 138         if (!PyArg_ParseTupleAndKeywords(args, kwargs, "O|OzOi",
 139                                          discard_const_p(char *, kwnames),
 140                                          &py_ldb, &py_lp_ctx, &principal, &py_dn, &session_info_flags)) {
 141                 return NULL;
 142         }
 143
 144         mem_ctx = talloc_new(NULL);
 145         if (mem_ctx == NULL) {
 146                 PyErr_NoMemory();
 147                 return NULL;
 148         }
 149
 150         ldb_ctx = pyldb_Ldb_AsLdbContext(py_ldb);
 151
 152         if (py_dn == Py_None) {
 153                 user_dn = NULL;
 154         } else {
 155                 if (!pyldb_Object_AsDn(ldb_ctx, py_dn, ldb_ctx, &user_dn)) {
 156                         talloc_free(mem_ctx);
 157                         return NULL;
 158                 }
 159         }
 160
 161         lp_ctx = lpcfg_from_py_object(mem_ctx, py_lp_ctx);
 162         if (lp_ctx == NULL) {
 163                 talloc_free(mem_ctx);
 164                 return NULL;
 165         }
 166
 167         nt_status = authsam_get_session_info_principal(mem_ctx, lp_ctx, ldb_ctx, principal, user_dn,
 168                                                        session_info_flags, &session);
 169         if (!NT_STATUS_IS_OK(nt_status)) {
 170                 talloc_free(mem_ctx);
 171                 PyErr_NTSTATUS_IS_ERR_RAISE(nt_status);
 172         }
 173
 174         talloc_steal(NULL, session);
 175         talloc_free(mem_ctx);
 176
 177         return PyAuthSession_FromSession(session);
 178 }
 179
 180
 181 static const char **PyList_AsStringList(TALLOC_CTX *mem_ctx, PyObject *list,
 182                                         const char *paramname)
 183 {
 184         const char **ret;
 185         Py_ssize_t i;
 186         if (!PyList_Check(list)) {
 187                 PyErr_Format(PyExc_TypeError, "%s is not a list", paramname);
 188                 return NULL;
 189         }
 190         ret = talloc_array(NULL, const char *, PyList_Size(list)+1);
 191         if (ret == NULL) {
 192                 PyErr_NoMemory();
 193                 return NULL;
 194         }
 195
 196         for (i = 0; i < PyList_Size(list); i++) {
 197                 PyObject *item = PyList_GetItem(list, i);
 198                 if (!PyString_Check(item)) {
 199                         PyErr_Format(PyExc_TypeError, "%s should be strings", paramname);
 200                         return NULL;
 201                 }
 202                 ret[i] = talloc_strndup(ret, PyString_AsString(item),
 203                                         PyString_Size(item));
 204         }
 205         ret[i] = NULL;
 206         return ret;
 207 }
 208
 209 static PyObject *PyAuthContext_FromContext(struct auth4_context *auth_context)
 210 {
 211         return pytalloc_reference(&PyAuthContext, auth_context);
 212 }
 213
 214 static PyObject *py_auth_context_new(PyTypeObject *type, PyObject *args, PyObject *kwargs)
 215 {
 216         PyObject *py_lp_ctx = Py_None;
 217         PyObject *py_ldb = Py_None;
 218         PyObject *py_imessaging_ctx = Py_None;
 219         PyObject *py_auth_context = Py_None;
 220         PyObject *py_methods = Py_None;
 221         TALLOC_CTX *mem_ctx;
 222         struct auth4_context *auth_context;
 223         struct imessaging_context *imessaging_context = NULL;
 224         struct loadparm_context *lp_ctx;
 225         struct tevent_context *ev;
 226         struct ldb_context *ldb = NULL;
 227         NTSTATUS nt_status;
 228         const char **methods;
 229
 230         const char * const kwnames[] = { "lp_ctx", "messaging_ctx", "ldb", "methods", NULL };
 231
 232         if (!PyArg_ParseTupleAndKeywords(args, kwargs, "|OOOO",
 233                                          discard_const_p(char *, kwnames),
 234                                          &py_lp_ctx, &py_imessaging_ctx, &py_ldb, &py_methods))
 235                 return NULL;
 236
 237         mem_ctx = talloc_new(NULL);
 238         if (mem_ctx == NULL) {
 239                 PyErr_NoMemory();
 240                 return NULL;
 241         }
 242
 243         if (py_ldb != Py_None) {
 244                 ldb = pyldb_Ldb_AsLdbContext(py_ldb);
 245         }
 246
 247         lp_ctx = lpcfg_from_py_object(mem_ctx, py_lp_ctx);
 248
 249         ev = s4_event_context_init(mem_ctx);
 250         if (ev == NULL) {
 251                 PyErr_NoMemory();
 252                 return NULL;
 253         }
 254
 255         if (py_imessaging_ctx != Py_None) {
 256                 imessaging_context = pytalloc_get_type(py_imessaging_ctx, struct imessaging_context);
 257         }
 258
 259         if (py_methods == Py_None && py_ldb == Py_None) {
 260                 nt_status = auth_context_create(mem_ctx, ev, imessaging_context, lp_ctx, &auth_context);
 261         } else {
 262                 if (py_methods != Py_None) {
 263                         methods = PyList_AsStringList(mem_ctx, py_methods, "methods");
 264                         if (methods == NULL) {
 265                                 talloc_free(mem_ctx);
 266                                 return NULL;
 267                         }
 268                 } else {
 269                         methods = auth_methods_from_lp(mem_ctx, lp_ctx);
 270                 }
 271                 nt_status = auth_context_create_methods(mem_ctx, methods, ev,
 272                                                         imessaging_context, lp_ctx,
 273                                                         ldb, &auth_context);
 274         }
 275
 276         if (!NT_STATUS_IS_OK(nt_status)) {
 277                 talloc_free(mem_ctx);
 278                 PyErr_NTSTATUS_IS_ERR_RAISE(nt_status);
 279         }
 280
 281         if (!talloc_reference(auth_context, lp_ctx)) {
 282                 talloc_free(mem_ctx);
 283                 PyErr_NoMemory();
 284                 return NULL;
 285         }
 286
 287         if (!talloc_reference(auth_context, ev)) {
 288                 talloc_free(mem_ctx);
 289                 PyErr_NoMemory();
 290                 return NULL;
 291         }
 292
 293         py_auth_context = PyAuthContext_FromContext(auth_context);
 294
 295         talloc_free(mem_ctx);
 296
 297         return py_auth_context;
 298 }
 299
 300 static PyTypeObject PyAuthContext = {
 301         .tp_name = "AuthContext",
 302         .tp_basicsize = sizeof(pytalloc_Object),
 303         .tp_flags = Py_TPFLAGS_DEFAULT,
 304         .tp_new = py_auth_context_new,
 305 };
 306
 307 static PyMethodDef py_auth_methods[] = {
 308         { "system_session", (PyCFunction)py_system_session, METH_VARARGS, NULL },
 309         { "admin_session", (PyCFunction)py_admin_session, METH_VARARGS, NULL },
 310         { "user_session", (PyCFunction)py_user_session, METH_VARARGS|METH_KEYWORDS, NULL },
 311         { NULL },
 312 };
 313
 314 void initauth(void)
 315 {
 316         PyObject *m;
 317
 318         PyAuthContext.tp_base = pytalloc_GetObjectType();
 319         if (PyAuthContext.tp_base == NULL)
 320                 return;
 321
 322         if (PyType_Ready(&PyAuthContext) < 0)
 323                 return;
 324
 325         m = Py_InitModule3("auth", py_auth_methods,
 326                                            "Authentication and authorization support.");
 327         if (m == NULL)
 328                 return;
 329
 330         Py_INCREF(&PyAuthContext);
 331         PyModule_AddObject(m, "AuthContext", (PyObject *)&PyAuthContext);
 332
 333 #define ADD_FLAG(val)  PyModule_AddObject(m, #val, PyInt_FromLong(val))
 334         ADD_FLAG(AUTH_SESSION_INFO_DEFAULT_GROUPS);
 335         ADD_FLAG(AUTH_SESSION_INFO_AUTHENTICATED);
 336         ADD_FLAG(AUTH_SESSION_INFO_SIMPLE_PRIVILEGES);
 337
 338 }