lib/ldb-samba/pyldb.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3
   4    Python interface to ldb, Samba-specific functions
   5
   6    Copyright (C) 2007-2010 Jelmer Vernooij <jelmer@samba.org>
   7
   8    This library is free software; you can redistribute it and/or
   9    modify it under the terms of the GNU Lesser General Public
  10    License as published by the Free Software Foundation; either
  11    version 3 of the License, or (at your option) any later version.
  12
  13    This library is distributed in the hope that it will be useful,
  14    but WITHOUT ANY WARRANTY; without even the implied warranty of
  15    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  16    Lesser General Public License for more details.
  17
  18    You should have received a copy of the GNU Lesser General Public
  19    License along with this library; if not, see <http://www.gnu.org/licenses/>.
  20 */
  21
  22 #include <Python.h>
  23 #include "python/py3compat.h"
  24 #include "includes.h"
  25 #include <ldb.h>
  26 #include <pyldb.h>
  27 #include "param/pyparam.h"
  28 #include "auth/credentials/pycredentials.h"
  29 #include "ldb_wrap.h"
  30 #include "lib/ldb-samba/ldif_handlers.h"
  31 #include "auth/pyauth.h"
  32 #include "source4/dsdb/common/util.h"
  33 #include "lib/ldb/include/ldb_private.h"
  34
  35
  36 static PyObject *pyldb_module;
  37 static PyObject *py_ldb_error;
  38 static PyTypeObject PySambaLdb;
  39
  40 static void PyErr_SetLdbError(PyObject *error, int ret, struct ldb_context *ldb_ctx)
  41 {
  42         if (ret == LDB_ERR_PYTHON_EXCEPTION)
  43                 return; /* Python exception should already be set, just keep that */
  44
  45         PyErr_SetObject(error,
  46                         Py_BuildValue(discard_const_p(char, "(i,s)"), ret,
  47                         ldb_ctx == NULL?ldb_strerror(ret):ldb_errstring(ldb_ctx)));
  48 }
  49
  50 static PyObject *py_ldb_set_loadparm(PyObject *self, PyObject *args)
  51 {
  52         PyObject *py_lp_ctx;
  53         struct loadparm_context *lp_ctx;
  54         struct ldb_context *ldb;
  55
  56         if (!PyArg_ParseTuple(args, "O", &py_lp_ctx))
  57                 return NULL;
  58
  59         ldb = pyldb_Ldb_AS_LDBCONTEXT(self);
  60
  61         lp_ctx = lpcfg_from_py_object(ldb, py_lp_ctx);
  62         if (lp_ctx == NULL) {
  63                 PyErr_SetString(PyExc_TypeError, "Expected loadparm object");
  64                 return NULL;
  65         }
  66
  67         ldb_set_opaque(ldb, "loadparm", lp_ctx);
  68
  69         Py_RETURN_NONE;
  70 }
  71
  72 static PyObject *py_ldb_set_credentials(PyObject *self, PyObject *args)
  73 {
  74         PyObject *py_creds;
  75         struct cli_credentials *creds;
  76         struct ldb_context *ldb;
  77
  78         if (!PyArg_ParseTuple(args, "O", &py_creds))
  79                 return NULL;
  80
  81         creds = cli_credentials_from_py_object(py_creds);
  82         if (creds == NULL) {
  83                 PyErr_SetString(PyExc_TypeError, "Expected credentials object");
  84                 return NULL;
  85         }
  86
  87         ldb = pyldb_Ldb_AS_LDBCONTEXT(self);
  88
  89         ldb_set_opaque(ldb, "credentials", creds);
  90
  91         Py_RETURN_NONE;
  92 }
  93
  94 /* XXX: This function really should be in libldb's pyldb.c */
  95 static PyObject *py_ldb_set_opaque_integer(PyObject *self, PyObject *args)
  96 {
  97         int value;
  98         int *old_val, *new_val;
  99         char *py_opaque_name, *opaque_name_talloc;
 100         struct ldb_context *ldb;
 101         int ret;
 102         TALLOC_CTX *tmp_ctx;
 103
 104         if (!PyArg_ParseTuple(args, "si", &py_opaque_name, &value))
 105                 return NULL;
 106
 107         ldb = pyldb_Ldb_AS_LDBCONTEXT(self);
 108
 109         /* see if we have a cached copy */
 110         old_val = (int *)ldb_get_opaque(ldb, py_opaque_name);
 111         /* XXX: We shouldn't just blindly assume that the value that is
 112          * already present has the size of an int and is not shared
 113          * with other code that may rely on it not changing.
 114          * JRV 20100403 */
 115
 116         if (old_val) {
 117                 *old_val = value;
 118                 Py_RETURN_NONE;
 119         }
 120
 121         tmp_ctx = talloc_new(ldb);
 122         if (tmp_ctx == NULL) {
 123                 PyErr_NoMemory();
 124                 return NULL;
 125         }
 126
 127         new_val = talloc(tmp_ctx, int);
 128         if (new_val == NULL) {
 129                 talloc_free(tmp_ctx);
 130                 PyErr_NoMemory();
 131                 return NULL;
 132         }
 133
 134         opaque_name_talloc = talloc_strdup(tmp_ctx, py_opaque_name);
 135         if (opaque_name_talloc == NULL) {
 136                 talloc_free(tmp_ctx);
 137                 PyErr_NoMemory();
 138                 return NULL;
 139         }
 140
 141         *new_val = value;
 142
 143         /* cache the domain_sid in the ldb */
 144         ret = ldb_set_opaque(ldb, opaque_name_talloc, new_val);
 145
 146         if (ret != LDB_SUCCESS) {
 147                 talloc_free(tmp_ctx);
 148                 PyErr_SetLdbError(py_ldb_error, ret, ldb);
 149                 return NULL;
 150         }
 151
 152         talloc_steal(ldb, new_val);
 153         talloc_steal(ldb, opaque_name_talloc);
 154         talloc_free(tmp_ctx);
 155
 156         Py_RETURN_NONE;
 157 }
 158
 159 static PyObject *py_ldb_set_utf8_casefold(PyObject *self,
 160                 PyObject *Py_UNUSED(ignored))
 161 {
 162         struct ldb_context *ldb;
 163
 164         ldb = pyldb_Ldb_AS_LDBCONTEXT(self);
 165
 166         ldb_set_utf8_fns(ldb, NULL, wrap_casefold);
 167
 168         Py_RETURN_NONE;
 169 }
 170
 171 static PyObject *py_ldb_set_session_info(PyObject *self, PyObject *args)
 172 {
 173         PyObject *py_session_info;
 174         struct auth_session_info *info;
 175         struct ldb_context *ldb;
 176         PyObject *mod_samba_auth;
 177         PyObject *PyAuthSession_Type;
 178         bool ret;
 179
 180         mod_samba_auth = PyImport_ImportModule("samba.dcerpc.auth");
 181         if (mod_samba_auth == NULL)
 182                 return NULL;
 183
 184         PyAuthSession_Type = PyObject_GetAttrString(mod_samba_auth, "session_info");
 185         if (PyAuthSession_Type == NULL) {
 186                 Py_CLEAR(mod_samba_auth);
 187                 return NULL;
 188         }
 189
 190         ret = PyArg_ParseTuple(args, "O!", PyAuthSession_Type, &py_session_info);
 191
 192         Py_DECREF(PyAuthSession_Type);
 193         Py_DECREF(mod_samba_auth);
 194
 195         if (!ret)
 196                 return NULL;
 197
 198         ldb = pyldb_Ldb_AS_LDBCONTEXT(self);
 199
 200         info = PyAuthSession_AsSession(py_session_info);
 201
 202         ldb_set_opaque(ldb, DSDB_SESSION_INFO, info);
 203
 204         Py_RETURN_NONE;
 205 }
 206
 207 static PyObject *py_ldb_samba_schema_attribute_add(PyLdbObject *self,
 208                                                    PyObject *args)
 209 {
 210         char *attribute, *syntax;
 211         const struct ldb_schema_syntax *s;
 212         unsigned int flags;
 213         int ret;
 214         struct ldb_context *ldb_ctx;
 215
 216         if (!PyArg_ParseTuple(args, "sIs", &attribute, &flags, &syntax))
 217                 return NULL;
 218
 219         ldb_ctx = pyldb_Ldb_AsLdbContext((PyObject *)self);
 220
 221         s = ldb_samba_syntax_by_name(ldb_ctx, syntax);
 222         ret = ldb_schema_attribute_add_with_syntax(ldb_ctx, attribute,
 223                                                    flags, s);
 224
 225         PyErr_LDB_ERROR_IS_ERR_RAISE(py_ldb_error, ret, ldb_ctx);
 226
 227         Py_RETURN_NONE;
 228 }
 229
 230 static PyObject *py_ldb_register_samba_handlers(PyObject *self,
 231                 PyObject *Py_UNUSED(ignored))
 232 {
 233         struct ldb_context *ldb;
 234         int ret;
 235
 236         /* XXX: Perhaps call this from PySambaLdb's init function ? */
 237
 238         ldb = pyldb_Ldb_AS_LDBCONTEXT(self);
 239         ret = ldb_register_samba_handlers(ldb);
 240
 241         PyErr_LDB_ERROR_IS_ERR_RAISE(py_ldb_error, ret, ldb);
 242
 243         Py_RETURN_NONE;
 244 }
 245
 246 static PyMethodDef py_samba_ldb_methods[] = {
 247         { "set_loadparm", (PyCFunction)py_ldb_set_loadparm, METH_VARARGS,
 248                 "set_loadparm(session_info)\n"
 249                 "Set loadparm context to use when connecting." },
 250         { "set_credentials", (PyCFunction)py_ldb_set_credentials, METH_VARARGS,
 251                 "set_credentials(credentials)\n"
 252                 "Set credentials to use when connecting." },
 253         { "set_opaque_integer", (PyCFunction)py_ldb_set_opaque_integer,
 254                 METH_VARARGS, NULL },
 255         { "set_utf8_casefold", (PyCFunction)py_ldb_set_utf8_casefold,
 256                 METH_NOARGS,
 257                 "set_utf8_casefold()\n"
 258                 "Set the right Samba casefolding function for UTF8 charset." },
 259         { "register_samba_handlers", (PyCFunction)py_ldb_register_samba_handlers,
 260                 METH_NOARGS,
 261                 "register_samba_handlers()\n"
 262                 "Register Samba-specific LDB modules and schemas." },
 263         { "set_session_info", (PyCFunction)py_ldb_set_session_info, METH_VARARGS,
 264                 "set_session_info(session_info)\n"
 265                 "Set session info to use when connecting." },
 266         { "samba_schema_attribute_add",
 267                 (PyCFunction)py_ldb_samba_schema_attribute_add,
 268                 METH_VARARGS, NULL },
 269         {0},
 270 };
 271
 272 static struct PyModuleDef moduledef = {
 273     PyModuleDef_HEAD_INIT,
 274     .m_name = "_ldb",
 275     .m_doc = "Samba-specific LDB python bindings",
 276     .m_size = -1,
 277     .m_methods = py_samba_ldb_methods,
 278 };
 279
 280 static PyTypeObject PySambaLdb = {
 281         .tp_name = "samba._ldb.Ldb",
 282         .tp_doc = "Connection to a LDB database.",
 283         .tp_methods = py_samba_ldb_methods,
 284         .tp_flags = Py_TPFLAGS_DEFAULT|Py_TPFLAGS_BASETYPE,
 285 };
 286
 287
 288 MODULE_INIT_FUNC(_ldb)
 289 {
 290         PyObject *m;
 291
 292         pyldb_module = PyImport_ImportModule("ldb");
 293         if (pyldb_module == NULL)
 294                 return NULL;
 295
 296         PySambaLdb.tp_base = (PyTypeObject *)PyObject_GetAttrString(pyldb_module, "Ldb");
 297         if (PySambaLdb.tp_base == NULL) {
 298                 Py_CLEAR(pyldb_module);
 299                 return NULL;
 300         }
 301
 302         py_ldb_error = PyObject_GetAttrString(pyldb_module, "LdbError");
 303
 304         Py_CLEAR(pyldb_module);
 305
 306         if (PyType_Ready(&PySambaLdb) < 0)
 307                 return NULL;
 308
 309         m = PyModule_Create(&moduledef);
 310         if (m == NULL)
 311                 return NULL;
 312
 313         Py_INCREF(&PySambaLdb);
 314         PyModule_AddObject(m, "Ldb", (PyObject *)&PySambaLdb);
 315
 316 #define ADD_LDB_STRING(val)  PyModule_AddStringConstant(m, #val, LDB_## val)
 317         ADD_LDB_STRING(SYNTAX_SAMBA_INT32);
 318
 319         return m;
 320 }