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 static PyObject *PyAuthSession_FromSession(struct auth_session_info *session)
  47 {
  48         return py_return_ndr_struct("samba.dcerpc.auth", "session_info", session, session);
  49 }
  50
  51 static PyObject *py_system_session(PyObject *module, PyObject *args)
  52 {
  53         PyObject *py_lp_ctx = Py_None;
  54         struct loadparm_context *lp_ctx = NULL;
  55         struct auth_session_info *session;
  56         TALLOC_CTX *mem_ctx;
  57         if (!PyArg_ParseTuple(args, "|O", &py_lp_ctx))
  58                 return NULL;
  59
  60         mem_ctx = talloc_new(NULL);
  61         if (mem_ctx == NULL) {
  62                 PyErr_NoMemory();
  63                 return NULL;
  64         }
  65
  66         lp_ctx = lpcfg_from_py_object(mem_ctx, py_lp_ctx);
  67         if (lp_ctx == NULL) {
  68                 talloc_free(mem_ctx);
  69                 return NULL;
  70         }
  71
  72         session = system_session(lp_ctx);
  73
  74         talloc_free(mem_ctx);
  75
  76         return PyAuthSession_FromSession(session);
  77 }
  78
  79
  80 static PyObject *py_admin_session(PyObject *module, PyObject *args)
  81 {
  82         PyObject *py_lp_ctx;
  83         PyObject *py_sid;
  84         struct loadparm_context *lp_ctx = NULL;
  85         struct auth_session_info *session;
  86         struct dom_sid *domain_sid = NULL;
  87         TALLOC_CTX *mem_ctx;
  88
  89         if (!PyArg_ParseTuple(args, "OO", &py_lp_ctx, &py_sid))
  90                 return NULL;
  91
  92         mem_ctx = talloc_new(NULL);
  93         if (mem_ctx == NULL) {
  94                 PyErr_NoMemory();
  95                 return NULL;
  96         }
  97
  98         lp_ctx = lpcfg_from_py_object(mem_ctx, py_lp_ctx);
  99         if (lp_ctx == NULL) {
 100                 talloc_free(mem_ctx);
 101                 return NULL;
 102         }
 103
 104         domain_sid = dom_sid_parse_talloc(mem_ctx, PyString_AsString(py_sid));
 105         if (domain_sid == NULL) {
 106                 PyErr_Format(PyExc_RuntimeError, "Unable to parse sid %s",
 107                                          PyString_AsString(py_sid));
 108                 talloc_free(mem_ctx);
 109                 return NULL;
 110         }
 111         session = admin_session(NULL, lp_ctx, domain_sid);
 112         talloc_free(mem_ctx);
 113
 114         return PyAuthSession_FromSession(session);
 115 }
 116
 117 static PyObject *py_user_session(PyObject *module, PyObject *args, PyObject *kwargs)
 118 {
 119         NTSTATUS nt_status;
 120         struct auth_session_info *session;
 121         TALLOC_CTX *mem_ctx;
 122         const char * const kwnames[] = { "ldb", "lp_ctx", "principal", "dn", "session_info_flags", NULL };
 123         struct ldb_context *ldb_ctx;
 124         PyObject *py_ldb = Py_None;
 125         PyObject *py_dn = Py_None;
 126         PyObject *py_lp_ctx = Py_None;
 127         struct loadparm_context *lp_ctx = NULL;
 128         struct ldb_dn *user_dn;
 129         char *principal = NULL;
 130         int session_info_flags = 0; /* This is an int, because that's
 131                                  * what we need for the python
 132                                  * PyArg_ParseTupleAndKeywords */
 133
 134         if (!PyArg_ParseTupleAndKeywords(args, kwargs, "O|OzOi",
 135                                          discard_const_p(char *, kwnames),
 136                                          &py_ldb, &py_lp_ctx, &principal, &py_dn, &session_info_flags)) {
 137                 return NULL;
 138         }
 139
 140         mem_ctx = talloc_new(NULL);
 141         if (mem_ctx == NULL) {
 142                 PyErr_NoMemory();
 143                 return NULL;
 144         }
 145
 146         ldb_ctx = pyldb_Ldb_AsLdbContext(py_ldb);
 147
 148         if (py_dn == Py_None) {
 149                 user_dn = NULL;
 150         } else {
 151                 if (!pyldb_Object_AsDn(ldb_ctx, py_dn, ldb_ctx, &user_dn)) {
 152                         talloc_free(mem_ctx);
 153                         return NULL;
 154                 }
 155         }
 156
 157         lp_ctx = lpcfg_from_py_object(mem_ctx, py_lp_ctx);
 158         if (lp_ctx == NULL) {
 159                 talloc_free(mem_ctx);
 160                 return NULL;
 161         }
 162
 163         nt_status = authsam_get_session_info_principal(mem_ctx, lp_ctx, ldb_ctx, principal, user_dn,
 164                                                        session_info_flags, &session);
 165         if (!NT_STATUS_IS_OK(nt_status)) {
 166                 talloc_free(mem_ctx);
 167                 PyErr_NTSTATUS_IS_ERR_RAISE(nt_status);
 168         }
 169
 170         talloc_steal(NULL, session);
 171         talloc_free(mem_ctx);
 172
 173         return PyAuthSession_FromSession(session);
 174 }
 175
 176
 177 static const char **PyList_AsStringList(TALLOC_CTX *mem_ctx, PyObject *list,
 178                                         const char *paramname)
 179 {
 180         const char **ret;
 181         Py_ssize_t i;
 182         if (!PyList_Check(list)) {
 183                 PyErr_Format(PyExc_TypeError, "%s is not a list", paramname);
 184                 return NULL;
 185         }
 186         ret = talloc_array(NULL, const char *, PyList_Size(list)+1);
 187         if (ret == NULL) {
 188                 PyErr_NoMemory();
 189                 return NULL;
 190         }
 191
 192         for (i = 0; i < PyList_Size(list); i++) {
 193                 PyObject *item = PyList_GetItem(list, i);
 194                 if (!PyString_Check(item)) {
 195                         PyErr_Format(PyExc_TypeError, "%s should be strings", paramname);
 196                         return NULL;
 197                 }
 198                 ret[i] = talloc_strndup(ret, PyString_AsString(item),
 199                                         PyString_Size(item));
 200         }
 201         ret[i] = NULL;
 202         return ret;
 203 }
 204
 205 static PyObject *PyAuthContext_FromContext(struct auth4_context *auth_context)
 206 {
 207         return pytalloc_reference(&PyAuthContext, auth_context);
 208 }
 209
 210 static PyObject *py_auth_context_new(PyTypeObject *type, PyObject *args, PyObject *kwargs)
 211 {
 212         PyObject *py_lp_ctx = Py_None;
 213         PyObject *py_ldb = Py_None;
 214         PyObject *py_imessaging_ctx = Py_None;
 215         PyObject *py_auth_context = Py_None;
 216         PyObject *py_methods = Py_None;
 217         TALLOC_CTX *mem_ctx;
 218         struct auth4_context *auth_context;
 219         struct imessaging_context *imessaging_context = NULL;
 220         struct loadparm_context *lp_ctx;
 221         struct tevent_context *ev;
 222         struct ldb_context *ldb = NULL;
 223         NTSTATUS nt_status;
 224         const char **methods;
 225
 226         const char * const kwnames[] = { "lp_ctx", "messaging_ctx", "ldb", "methods", NULL };
 227
 228         if (!PyArg_ParseTupleAndKeywords(args, kwargs, "|OOOO",
 229                                          discard_const_p(char *, kwnames),
 230                                          &py_lp_ctx, &py_imessaging_ctx, &py_ldb, &py_methods))
 231                 return NULL;
 232
 233         mem_ctx = talloc_new(NULL);
 234         if (mem_ctx == NULL) {
 235                 PyErr_NoMemory();
 236                 return NULL;
 237         }
 238
 239         if (py_ldb != Py_None) {
 240                 ldb = pyldb_Ldb_AsLdbContext(py_ldb);
 241         }
 242
 243         lp_ctx = lpcfg_from_py_object(mem_ctx, py_lp_ctx);
 244         if (lp_ctx == NULL) {
 245                 PyErr_NoMemory();
 246                 return NULL;
 247         }
 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 }