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