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 "includes.h"
  24 #include <ldb.h>
  25 #include <pyldb.h>
  26 #include "param/pyparam.h"
  27 #include "auth/credentials/pycredentials.h"
  28 #include "ldb_wrap.h"
  29 #include "lib/ldb-samba/ldif_handlers.h"
  30 #include "auth/pyauth.h"
  31
  32 void init_ldb(void);
  33
  34 static PyObject *pyldb_module;
  35 static PyObject *py_ldb_error;
  36 staticforward PyTypeObject PySambaLdb;
  37
  38 static void PyErr_SetLdbError(PyObject *error, int ret, struct ldb_context *ldb_ctx)
  39 {
  40         if (ret == LDB_ERR_PYTHON_EXCEPTION)
  41                 return; /* Python exception should already be set, just keep that */
  42
  43         PyErr_SetObject(error,
  44                         Py_BuildValue(discard_const_p(char, "(i,s)"), ret,
  45                         ldb_ctx == NULL?ldb_strerror(ret):ldb_errstring(ldb_ctx)));
  46 }
  47
  48 static PyObject *py_ldb_set_loadparm(PyObject *self, PyObject *args)
  49 {
  50         PyObject *py_lp_ctx;
  51         struct loadparm_context *lp_ctx;
  52         struct ldb_context *ldb;
  53
  54         if (!PyArg_ParseTuple(args, "O", &py_lp_ctx))
  55                 return NULL;
  56
  57         ldb = PyLdb_AsLdbContext(self);
  58
  59         lp_ctx = lpcfg_from_py_object(ldb, py_lp_ctx);
  60         if (lp_ctx == NULL) {
  61                 PyErr_SetString(PyExc_TypeError, "Expected loadparm object");
  62                 return NULL;
  63         }
  64
  65         ldb_set_opaque(ldb, "loadparm", lp_ctx);
  66
  67         Py_RETURN_NONE;
  68 }
  69
  70 static PyObject *py_ldb_set_credentials(PyObject *self, PyObject *args)
  71 {
  72         PyObject *py_creds;
  73         struct cli_credentials *creds;
  74         struct ldb_context *ldb;
  75
  76         if (!PyArg_ParseTuple(args, "O", &py_creds))
  77                 return NULL;
  78
  79         creds = cli_credentials_from_py_object(py_creds);
  80         if (creds == NULL) {
  81                 PyErr_SetString(PyExc_TypeError, "Expected credentials object");
  82                 return NULL;
  83         }
  84
  85         ldb = PyLdb_AsLdbContext(self);
  86
  87         ldb_set_opaque(ldb, "credentials", creds);
  88
  89         Py_RETURN_NONE;
  90 }
  91
  92 /* XXX: This function really should be in libldb's pyldb.c */
  93 static PyObject *py_ldb_set_opaque_integer(PyObject *self, PyObject *args)
  94 {
  95         int value;
  96         int *old_val, *new_val;
  97         char *py_opaque_name, *opaque_name_talloc;
  98         struct ldb_context *ldb;
  99         int ret;
 100         TALLOC_CTX *tmp_ctx;
 101
 102         if (!PyArg_ParseTuple(args, "si", &py_opaque_name, &value))
 103                 return NULL;
 104
 105         ldb = PyLdb_AsLdbContext(self);
 106
 107         /* see if we have a cached copy */
 108         old_val = (int *)ldb_get_opaque(ldb, py_opaque_name);
 109         /* XXX: We shouldn't just blindly assume that the value that is
 110          * already present has the size of an int and is not shared
 111          * with other code that may rely on it not changing.
 112          * JRV 20100403 */
 113
 114         if (old_val) {
 115                 *old_val = value;
 116                 Py_RETURN_NONE;
 117         }
 118
 119         tmp_ctx = talloc_new(ldb);
 120         if (tmp_ctx == NULL) {
 121                 PyErr_NoMemory();
 122                 return NULL;
 123         }
 124
 125         new_val = talloc(tmp_ctx, int);
 126         if (new_val == NULL) {
 127                 talloc_free(tmp_ctx);
 128                 PyErr_NoMemory();
 129                 return NULL;
 130         }
 131
 132         opaque_name_talloc = talloc_strdup(tmp_ctx, py_opaque_name);
 133         if (opaque_name_talloc == NULL) {
 134                 talloc_free(tmp_ctx);
 135                 PyErr_NoMemory();
 136                 return NULL;
 137         }
 138
 139         *new_val = value;
 140
 141         /* cache the domain_sid in the ldb */
 142         ret = ldb_set_opaque(ldb, opaque_name_talloc, new_val);
 143
 144         if (ret != LDB_SUCCESS) {
 145                 talloc_free(tmp_ctx);
 146                 PyErr_SetLdbError(py_ldb_error, ret, ldb);
 147                 return NULL;
 148         }
 149
 150         talloc_steal(ldb, new_val);
 151         talloc_steal(ldb, opaque_name_talloc);
 152         talloc_free(tmp_ctx);
 153
 154         Py_RETURN_NONE;
 155 }
 156
 157 static PyObject *py_ldb_set_utf8_casefold(PyObject *self)
 158 {
 159         struct ldb_context *ldb;
 160
 161         ldb = PyLdb_AsLdbContext(self);
 162
 163         ldb_set_utf8_fns(ldb, NULL, wrap_casefold);
 164
 165         Py_RETURN_NONE;
 166 }
 167
 168 static PyObject *py_ldb_set_session_info(PyObject *self, PyObject *args)
 169 {
 170         PyObject *py_session_info;
 171         struct auth_session_info *info;
 172         struct ldb_context *ldb;
 173         PyObject *mod_samba_auth;
 174         PyObject *PyAuthSession_Type;
 175         bool ret;
 176
 177         mod_samba_auth = PyImport_ImportModule("samba.dcerpc.auth");
 178         if (mod_samba_auth == NULL)
 179                 return NULL;
 180
 181         PyAuthSession_Type = PyObject_GetAttrString(mod_samba_auth, "session_info");
 182         if (PyAuthSession_Type == NULL)
 183                 return NULL;
 184
 185         ret = PyArg_ParseTuple(args, "O!", PyAuthSession_Type, &py_session_info);
 186
 187         Py_DECREF(PyAuthSession_Type);
 188         Py_DECREF(mod_samba_auth);
 189
 190         if (!ret)
 191                 return NULL;
 192
 193         ldb = PyLdb_AsLdbContext(self);
 194
 195         info = PyAuthSession_AsSession(py_session_info);
 196
 197         ldb_set_opaque(ldb, "sessionInfo", info);
 198
 199         Py_RETURN_NONE;
 200 }
 201
 202 static PyObject *py_ldb_register_samba_handlers(PyObject *self)
 203 {
 204         struct ldb_context *ldb;
 205         int ret;
 206
 207         /* XXX: Perhaps call this from PySambaLdb's init function ? */
 208
 209         ldb = PyLdb_AsLdbContext(self);
 210         ret = ldb_register_samba_handlers(ldb);
 211
 212         PyErr_LDB_ERROR_IS_ERR_RAISE(py_ldb_error, ret, ldb);
 213
 214         Py_RETURN_NONE;
 215 }
 216
 217 static PyMethodDef py_samba_ldb_methods[] = {
 218         { "set_loadparm", (PyCFunction)py_ldb_set_loadparm, METH_VARARGS,
 219                 "ldb_set_loadparm(session_info)\n"
 220                 "Set loadparm context to use when connecting." },
 221         { "set_credentials", (PyCFunction)py_ldb_set_credentials, METH_VARARGS,
 222                 "ldb_set_credentials(credentials)\n"
 223                 "Set credentials to use when connecting." },
 224         { "set_opaque_integer", (PyCFunction)py_ldb_set_opaque_integer,
 225                 METH_VARARGS, NULL },
 226         { "set_utf8_casefold", (PyCFunction)py_ldb_set_utf8_casefold,
 227                 METH_NOARGS,
 228                 "ldb_set_utf8_casefold()\n"
 229                 "Set the right Samba casefolding function for UTF8 charset." },
 230         { "register_samba_handlers", (PyCFunction)py_ldb_register_samba_handlers,
 231                 METH_NOARGS,
 232                 "register_samba_handlers()\n"
 233                 "Register Samba-specific LDB modules and schemas." },
 234         { "set_session_info", (PyCFunction)py_ldb_set_session_info, METH_VARARGS,
 235                 "set_session_info(session_info)\n"
 236                 "Set session info to use when connecting." },
 237         { NULL },
 238 };
 239
 240 static PyTypeObject PySambaLdb = {
 241         .tp_name = "samba._ldb.Ldb",
 242         .tp_doc = "Connection to a LDB database.",
 243         .tp_methods = py_samba_ldb_methods,
 244         .tp_flags = Py_TPFLAGS_DEFAULT|Py_TPFLAGS_BASETYPE,
 245 };
 246
 247 void init_ldb(void)
 248 {
 249         PyObject *m;
 250
 251         pyldb_module = PyImport_ImportModule("ldb");
 252         if (pyldb_module == NULL)
 253                 return;
 254
 255         PySambaLdb.tp_base = (PyTypeObject *)PyObject_GetAttrString(pyldb_module, "Ldb");
 256         if (PySambaLdb.tp_base == NULL)
 257                 return;
 258
 259         py_ldb_error = PyObject_GetAttrString(pyldb_module, "LdbError");
 260
 261         if (PyType_Ready(&PySambaLdb) < 0)
 262                 return;
 263
 264         m = Py_InitModule3("_ldb", NULL, "Samba-specific LDB python bindings");
 265         if (m == NULL)
 266                 return;
 267
 268         Py_INCREF(&PySambaLdb);
 269         PyModule_AddObject(m, "Ldb", (PyObject *)&PySambaLdb);
 270 }