source4/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 "lib/ldb/pyldb.h"
  23 #include "includes.h"
  24 #include "param/pyparam.h"
  25 #include "auth/credentials/pycredentials.h"
  26 #include "ldb_wrap.h"
  27 #include "lib/ldb-samba/ldif_handlers.h"
  28 #include "auth/pyauth.h"
  29
  30 static PyObject *pyldb_module;
  31 static PyObject *py_ldb_error;
  32 staticforward PyTypeObject PySambaLdb;
  33
  34 static void PyErr_SetLdbError(PyObject *error, int ret, struct ldb_context *ldb_ctx)
  35 {
  36         if (ret == LDB_ERR_PYTHON_EXCEPTION)
  37                 return; /* Python exception should already be set, just keep that */
  38
  39         PyErr_SetObject(error,
  40                         Py_BuildValue(discard_const_p(char, "(i,s)"), ret,
  41                         ldb_ctx == NULL?ldb_strerror(ret):ldb_errstring(ldb_ctx)));
  42 }
  43
  44
  45
  46 static PyObject *py_ldb_set_loadparm(PyObject *self, PyObject *args)
  47 {
  48         PyObject *py_lp_ctx;
  49         struct loadparm_context *lp_ctx;
  50         struct ldb_context *ldb;
  51
  52         if (!PyArg_ParseTuple(args, "O", &py_lp_ctx))
  53                 return NULL;
  54
  55         ldb = PyLdb_AsLdbContext(self);
  56
  57         lp_ctx = lpcfg_from_py_object(ldb, py_lp_ctx);
  58         if (lp_ctx == NULL) {
  59                 PyErr_SetString(PyExc_TypeError, "Expected loadparm object");
  60                 return NULL;
  61         }
  62
  63         ldb_set_opaque(ldb, "loadparm", lp_ctx);
  64
  65         Py_RETURN_NONE;
  66 }
  67
  68 static PyObject *py_ldb_set_credentials(PyObject *self, PyObject *args)
  69 {
  70         PyObject *py_creds;
  71         struct cli_credentials *creds;
  72         struct ldb_context *ldb;
  73
  74         if (!PyArg_ParseTuple(args, "O", &py_creds))
  75                 return NULL;
  76
  77         creds = cli_credentials_from_py_object(py_creds);
  78         if (creds == NULL) {
  79                 PyErr_SetString(PyExc_TypeError, "Expected credentials object");
  80                 return NULL;
  81         }
  82
  83         ldb = PyLdb_AsLdbContext(self);
  84
  85         ldb_set_opaque(ldb, "credentials", creds);
  86
  87         Py_RETURN_NONE;
  88 }
  89
  90 /* XXX: This function really should be in libldb's pyldb.c */
  91 static PyObject *py_ldb_set_opaque_integer(PyObject *self, PyObject *args)
  92 {
  93         int value;
  94         int *old_val, *new_val;
  95         char *py_opaque_name, *opaque_name_talloc;
  96         struct ldb_context *ldb;
  97         int ret;
  98         TALLOC_CTX *tmp_ctx;
  99
 100         if (!PyArg_ParseTuple(args, "si", &py_opaque_name, &value))
 101                 return NULL;
 102
 103         ldb = PyLdb_AsLdbContext(self);
 104
 105         /* see if we have a cached copy */
 106         old_val = (int *)ldb_get_opaque(ldb, py_opaque_name);
 107         /* XXX: We shouldn't just blindly assume that the value that is
 108          * already present has the size of an int and is not shared
 109          * with other code that may rely on it not changing.
 110          * JRV 20100403 */
 111
 112         if (old_val) {
 113                 *old_val = value;
 114                 Py_RETURN_NONE;
 115         }
 116
 117         tmp_ctx = talloc_new(ldb);
 118         if (tmp_ctx == NULL) {
 119                 PyErr_NoMemory();
 120                 return NULL;
 121         }
 122
 123         new_val = talloc(tmp_ctx, int);
 124         if (new_val == NULL) {
 125                 talloc_free(tmp_ctx);
 126                 PyErr_NoMemory();
 127                 return NULL;
 128         }
 129
 130         opaque_name_talloc = talloc_strdup(tmp_ctx, py_opaque_name);
 131         if (opaque_name_talloc == NULL) {
 132                 talloc_free(tmp_ctx);
 133                 PyErr_NoMemory();
 134                 return NULL;
 135         }
 136
 137         *new_val = value;
 138
 139         /* cache the domain_sid in the ldb */
 140         ret = ldb_set_opaque(ldb, opaque_name_talloc, new_val);
 141
 142         if (ret != LDB_SUCCESS) {
 143                 talloc_free(tmp_ctx);
 144                 PyErr_SetLdbError(py_ldb_error, ret, ldb);
 145                 return NULL;
 146         }
 147
 148         talloc_steal(ldb, new_val);
 149         talloc_steal(ldb, opaque_name_talloc);
 150         talloc_free(tmp_ctx);
 151
 152         Py_RETURN_NONE;
 153 }
 154
 155 static PyObject *py_ldb_set_utf8_casefold(PyObject *self)
 156 {
 157         struct ldb_context *ldb;
 158
 159         ldb = PyLdb_AsLdbContext(self);
 160
 161         ldb_set_utf8_fns(ldb, NULL, wrap_casefold);
 162
 163         Py_RETURN_NONE;
 164 }
 165
 166 static PyObject *py_ldb_set_session_info(PyObject *self, PyObject *args)
 167 {
 168         PyObject *py_session_info;
 169         struct auth_session_info *info;
 170         struct ldb_context *ldb;
 171         PyObject *mod_samba_auth;
 172         PyObject *PyAuthSession_Type;
 173         bool ret;
 174
 175         mod_samba_auth = PyImport_ImportModule("samba.auth");
 176         if (mod_samba_auth == NULL)
 177                 return NULL;
 178
 179         PyAuthSession_Type = PyObject_GetAttrString(mod_samba_auth, "AuthSession");
 180         if (PyAuthSession_Type == NULL)
 181                 return NULL;
 182
 183         ret = PyArg_ParseTuple(args, "O!", PyAuthSession_Type, &py_session_info);
 184
 185         Py_DECREF(PyAuthSession_Type);
 186         Py_DECREF(mod_samba_auth);
 187
 188         if (!ret)
 189                 return NULL;
 190
 191         ldb = PyLdb_AsLdbContext(self);
 192
 193         info = PyAuthSession_AsSession(py_session_info);
 194
 195         ldb_set_opaque(ldb, "sessionInfo", info);
 196
 197         Py_RETURN_NONE;
 198 }
 199
 200 static PyObject *py_ldb_register_samba_handlers(PyObject *self)
 201 {
 202         struct ldb_context *ldb;
 203         int ret;
 204
 205         /* XXX: Perhaps call this from PySambaLdb's init function ? */
 206
 207         ldb = PyLdb_AsLdbContext(self);
 208         ret = ldb_register_samba_handlers(ldb);
 209
 210         PyErr_LDB_ERROR_IS_ERR_RAISE(py_ldb_error, ret, ldb);
 211
 212         Py_RETURN_NONE;
 213 }
 214
 215 static PyMethodDef py_samba_ldb_methods[] = {
 216         { "set_loadparm", (PyCFunction)py_ldb_set_loadparm, METH_VARARGS,
 217                 "ldb_set_loadparm(session_info)\n"
 218                 "Set loadparm context to use when connecting." },
 219         { "set_credentials", (PyCFunction)py_ldb_set_credentials, METH_VARARGS,
 220                 "ldb_set_credentials(credentials)\n"
 221                 "Set credentials to use when connecting." },
 222         { "set_opaque_integer", (PyCFunction)py_ldb_set_opaque_integer,
 223                 METH_VARARGS, NULL },
 224         { "set_utf8_casefold", (PyCFunction)py_ldb_set_utf8_casefold,
 225                 METH_NOARGS,
 226                 "ldb_set_utf8_casefold()\n"
 227                 "Set the right Samba casefolding function for UTF8 charset." },
 228         { "register_samba_handlers", (PyCFunction)py_ldb_register_samba_handlers,
 229                 METH_NOARGS,
 230                 "register_samba_handlers()\n"
 231                 "Register Samba-specific LDB modules and schemas." },
 232         { "set_session_info", (PyCFunction)py_ldb_set_session_info, METH_VARARGS,
 233                 "set_session_info(session_info)\n"
 234                 "Set session info to use when connecting." },
 235         { NULL },
 236 };
 237
 238 static PyTypeObject PySambaLdb = {
 239         .tp_name = "samba.Ldb",
 240         .tp_doc = "Connection to a LDB database.",
 241         .tp_methods = py_samba_ldb_methods,
 242         .tp_flags = Py_TPFLAGS_DEFAULT|Py_TPFLAGS_BASETYPE,
 243 };
 244
 245
 246 void init_ldb(void)
 247 {
 248         PyObject *m;
 249
 250         pyldb_module = PyImport_ImportModule("ldb");
 251         if (pyldb_module == NULL)
 252                 return;
 253
 254         PySambaLdb.tp_base = (PyTypeObject *)PyObject_GetAttrString(pyldb_module, "Ldb");
 255         if (PySambaLdb.tp_base == NULL)
 256                 return;
 257
 258         py_ldb_error = PyObject_GetAttrString(pyldb_module, "LdbError");
 259
 260         if (PyType_Ready(&PySambaLdb) < 0)
 261                 return;
 262
 263         m = Py_InitModule3("_ldb", NULL, "Samba-specific LDB python bindings");
 264         if (m == NULL)
 265                 return;
 266
 267         Py_INCREF(&PySambaLdb);
 268         PyModule_AddObject(m, "Ldb", (PyObject *)&PySambaLdb);
 269 }