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