summaryrefslogtreecommitdiff
path: root/server/python/pysss.c
blob: 8011ed67ed44ee8d7f4230a648b1fca53d1e86d6 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
/*
    Authors:
        Jakub Hrozek <jhrozek@redhat.com>

    Copyright (C) 2009 Red Hat

    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation; either version 3 of the License, or
    (at your option) any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with this program.  If not, see <http://www.gnu.org/licenses/>.
*/

#include <Python.h>
#include <structmember.h>
#include <talloc.h>
#include <pwd.h>
#include <grp.h>

#include "util/util.h"
#include "db/sysdb.h"
#include "tools/tools_util.h"
#include "tools/sss_sync_ops.h"

#define TRANSACTION_WAIT(trs, retval) do { \
    while (!trs->transaction_done) { \
        tevent_loop_once(trs->self->ev); \
    } \
    retval = trs->error; \
    if (retval) { \
        PyErr_SetSssError(retval); \
        goto fail; \
    } \
} while(0)

/*
 * function taken from samba sources tree as of Aug 20 2009,
 * file source4/lib/ldb/pyldb.c
 */
static char **PyList_AsStringList(TALLOC_CTX *mem_ctx, PyObject *list,
                                  const char *paramname)
{
    char **ret;
    int i;

    ret = talloc_array(NULL, char *, PyList_Size(list)+1);
    for (i = 0; i < PyList_Size(list); i++) {
        PyObject *item = PyList_GetItem(list, i);
        if (!PyString_Check(item)) {
            PyErr_Format(PyExc_TypeError, "%s should be strings", paramname);
            return NULL;
        }
        ret[i] = talloc_strndup(ret, PyString_AsString(item),
                                PyString_Size(item));
    }

    ret[i] = NULL;
    return ret;
}

/*
 * The sss.local object
 */
typedef struct {
    PyObject_HEAD

    TALLOC_CTX *mem_ctx;
    struct tevent_context *ev;
    struct sysdb_ctx *sysdb;
    struct confdb_ctx *confdb;

    struct sss_domain_info *local;

    int lock;
    int unlock;
} PySssLocalObject;

/*
 * The transaction object
 */
struct py_sss_transaction {
    PySssLocalObject *self;
    struct ops_ctx *ops;

    struct sysdb_handle *handle;
    bool transaction_done;
    int error;
};

/*
 * Error reporting
 */
static void PyErr_SetSssErrorWithMessage(int ret, const char *message)
{
    PyObject *exc = Py_BuildValue(discard_const_p(char, "(is)"),
                                  ret, message);

    PyErr_SetObject(PyExc_IOError, exc);
    Py_XDECREF(exc);
}

static void PyErr_SetSssError(int ret)
{
    PyErr_SetSssErrorWithMessage(ret, strerror(ret));
}

/*
 * Common init of all methods
 */
struct tools_ctx *init_ctx(TALLOC_CTX *mem_ctx,
                           PySssLocalObject *self)
{
    struct ops_ctx *octx = NULL;
    struct tools_ctx *tctx = NULL;

    tctx = talloc_zero(self->mem_ctx, struct tools_ctx);
    if (tctx == NULL) {
        return NULL;
    }

    tctx->ev = self->ev;
    tctx->confdb = self->confdb;
    tctx->sysdb = self->sysdb;
    tctx->local = self->local;
    /* tctx->nctx is NULL here, which is OK since we don't parse domains
     * in the python bindings (yet?) */

    octx = talloc_zero(tctx, struct ops_ctx);
    if (octx == NULL) {
        PyErr_NoMemory();
        return NULL;
    }
    octx->domain = self->local;

    tctx->octx = octx;
    return tctx;
}

/*
 * Add a user
 */
PyDoc_STRVAR(py_sss_useradd__doc__,
    "Add a user named ``username``.\n\n"
    ":param username: name of the user\n\n"
    ":param kwargs: Keyword arguments that customize the operation\n\n"
    "* useradd can be customized further with keyword arguments:\n"
    "    * ``uid``: The UID of the user\n"
    "    * ``gid``: The GID of the user\n"
    "    * ``gecos``: The comment string\n"
    "    * ``homedir``: Home directory\n"
    "    * ``shell``: Login shell\n"
    "    * ``skel``: Specify an alternative skeleton directory\n"
    "    * ``create_home``: (bool) Force creation of home directory on or off\n"
    "    * ``groups``: List of groups the user is member of\n");


static PyObject *py_sss_useradd(PySssLocalObject *self,
                                PyObject *args,
                                PyObject *kwds)
{
    struct tools_ctx *tctx = NULL;
    unsigned long uid = 0;
    unsigned long gid = 0;
    const char *gecos = NULL;
    const char *home = NULL;
    const char *shell = NULL;
    const char *skel = NULL;
    char *username = NULL;
    int ret;
    const char * const kwlist[] = { "username", "uid", "gid", "gecos",
                                    "homedir", "shell", "skel",
                                    "create_home", "groups", NULL };
    PyObject *py_groups = Py_None;
    PyObject *py_create_home = Py_None;
    int create_home = 0;

    /* parse arguments */
    if (!PyArg_ParseTupleAndKeywords(args, kwds,
                                     discard_const_p(char, "s|kkssssO!O!"),
                                     discard_const_p(char *, kwlist),
                                     &username,
                                     &uid,
                                     &gid,
                                     &gecos,
                                     &home,
                                     &shell,
                                     &skel,
                                     &PyBool_Type,
                                     &py_create_home,
                                     &PyList_Type,
                                     &py_groups)) {
        goto fail;
    }

    tctx = init_ctx(self->mem_ctx, self);
    if (!tctx) {
        PyErr_NoMemory();
        return NULL;
    }

    if (py_groups != Py_None) {
        tctx->octx->addgroups = PyList_AsStringList(tctx, py_groups, "groups");
        if (!tctx->octx->addgroups) {
            PyErr_NoMemory();
            return NULL;
        }
    }

    /* user-wise the parameter is only bool - do or don't,
     * however we must have a third state - undecided, pick default */
    if (py_create_home == Py_True) {
        create_home = DO_CREATE_HOME;
    } else if (py_create_home == Py_False) {
        create_home = DO_NOT_CREATE_HOME;
    }

    tctx->octx->name = username;
    tctx->octx->uid = uid;

    /* fill in defaults */
    ret = useradd_defaults(tctx,
                           self->confdb,
                           tctx->octx, gecos,
                           home, shell,
                           create_home,
                           skel);
    if (ret != EOK) {
        PyErr_SetSssError(ret);
        goto fail;
    }

    /* Add the user within a transaction */
    start_transaction(tctx);
    if (tctx->error != EOK) {
        PyErr_SetSssError(tctx->error);
        goto fail;
    }

    /* useradd */
    ret = useradd(tctx, self->ev,
                  self->sysdb, tctx->handle, tctx->octx);
    if (ret != EOK) {
        tctx->error = ret;

        /* cancel transaction */
        talloc_zfree(tctx->handle);
        PyErr_SetSssError(tctx->error);
        goto fail;
    }

    end_transaction(tctx);
    if (tctx->error) {
        PyErr_SetSssError(tctx->error);
        goto fail;
    }

    /* Create user's home directory and/or mail spool */
    if (tctx->octx->create_homedir) {
        /* We need to know the UID and GID of the user, if
         * sysdb did assign it automatically, do a lookup */
        if (tctx->octx->uid == 0 || tctx->octx->gid == 0) {
            ret = sysdb_getpwnam_sync(tctx,
                                      tctx->ev,
                                      tctx->sysdb,
                                      tctx->octx->name,
                                      tctx->local,
                                      &tctx->octx);
            if (ret != EOK) {
                PyErr_SetSssError(ret);
                goto fail;
            }
        }

        ret = create_homedir(tctx,
                             tctx->octx->skeldir,
                             tctx->octx->home,
                             tctx->octx->name,
                             tctx->octx->uid,
                             tctx->octx->gid,
                             tctx->octx->umask);
        if (ret != EOK) {
            PyErr_SetSssError(ret);
            goto fail;
        }

        /* failure here should not be fatal */
        create_mail_spool(tctx,
                          tctx->octx->name,
                          tctx->octx->maildir,
                          tctx->octx->uid,
                          tctx->octx->gid);
    }

    talloc_zfree(tctx);
    Py_RETURN_NONE;

fail:
    talloc_zfree(tctx);
    return NULL;
}

/*
 * Delete a user
 */
PyDoc_STRVAR(py_sss_userdel__doc__,
    "Remove the user named ``username``.\n\n"
    ":param username: Name of user being removed\n"
    ":param kwargs: Keyword arguments that customize the operation\n\n"
    "* userdel can be customized further with keyword arguments:\n"
    "    * ``force``: (bool) Force removal of files not owned by the user\n"
    "    * ``remove``: (bool) Toggle removing home directory and mail spool\n");

static PyObject *py_sss_userdel(PySssLocalObject *self,
                                PyObject *args,
                                PyObject *kwds)
{
    struct tools_ctx *tctx = NULL;
    char *username = NULL;
    int ret;
    PyObject *py_remove = Py_None;
    int remove_home = 0;
    PyObject *py_force = Py_None;
    const char * const kwlist[] = { "username", "remove", "force", NULL };

    if(!PyArg_ParseTupleAndKeywords(args, kwds,
                                    discard_const_p(char, "s|O!O!"),
                                    discard_const_p(char *, kwlist),
                                    &username,
                                    &PyBool_Type,
                                    &py_remove,
                                    &PyBool_Type,
                                    &py_force)) {
        goto fail;
    }

    tctx = init_ctx(self->mem_ctx, self);
    if (!tctx) {
        PyErr_NoMemory();
        return NULL;
    }

    tctx->octx->name = username;

    if (py_remove == Py_True) {
        remove_home = DO_REMOVE_HOME;
    } else if (py_remove == Py_False) {
        remove_home = DO_NOT_REMOVE_HOME;
    }

    /*
     * Fills in defaults for ops_ctx user did not specify.
     */
    ret = userdel_defaults(tctx,
                           tctx->confdb,
                           tctx->octx,
                           remove_home);
    if (ret != EOK) {
        PyErr_SetSssError(ret);
        goto fail;
    }

    if (tctx->octx->remove_homedir) {
        ret = sysdb_getpwnam_sync(tctx,
                                  tctx->ev,
                                  tctx->sysdb,
                                  tctx->octx->name,
                                  tctx->local,
                                  &tctx->octx);
        if (ret != EOK) {
            PyErr_SetSssError(ret);
            goto fail;
        }
    }

    /* Delete the user within a transaction */
    start_transaction(tctx);
    if (tctx->error != EOK) {
        PyErr_SetSssError(tctx->error);
        goto fail;
    }

    ret = userdel(tctx, self->ev,
                  self->sysdb, tctx->handle, tctx->octx);
    if (ret != EOK) {
        tctx->error = ret;

        /* cancel transaction */
        talloc_zfree(tctx->handle);
        PyErr_SetSssError(tctx->error);
        goto fail;
    }

    end_transaction(tctx);
    if (tctx->error) {
        PyErr_SetSssError(tctx->error);
        goto fail;
    }

    if (tctx->octx->remove_homedir) {
        ret = remove_homedir(tctx,
                             tctx->octx->home,
                             tctx->octx->maildir,
                             tctx->octx->name,
                             tctx->octx->uid,
                             (py_force == Py_True));
        if (ret != EOK) {
            PyErr_SetSssError(ret);
            goto fail;
        }
    }

    talloc_zfree(tctx);
    Py_RETURN_NONE;

fail:
    talloc_zfree(tctx);
    return NULL;
}

/*
 * Modify a user
 */
PyDoc_STRVAR(py_sss_usermod__doc__,
    "Modify a user.\n\n"
    ":param username: Name of user being modified\n\n"
    ":param kwargs: Keyword arguments that customize the operation\n\n"
    "* usermod can be customized further with keyword arguments:\n"
    "    * ``uid``: The UID of the user\n"
    "    * ``gid``: The GID of the user\n"
    "    * ``gecos``: The comment string\n"
    "    * ``homedir``: Home directory\n"
    "    * ``shell``: Login shell\n"
    "    * ``addgroups``: List of groups to add the user to\n"
    "    * ``rmgroups``: List of groups to remove the user from\n"
    "    * ``lock``: Lock or unlock the account\n");

static PyObject *py_sss_usermod(PySssLocalObject *self,
                                PyObject *args,
                                PyObject *kwds)
{
    struct tools_ctx *tctx = NULL;
    int ret;
    PyObject *py_addgroups = Py_None;
    PyObject *py_rmgroups = Py_None;
    unsigned long uid = 0;
    unsigned long gid = 0;
    char *gecos = NULL;
    char *home = NULL;
    char *shell = NULL;
    char *username = NULL;
    unsigned long lock = 0;
    const char * const kwlist[] = { "username", "uid", "gid", "lock",
                                    "gecos",  "homedir", "shell",
                                    "addgroups", "rmgroups", NULL };

    /* parse arguments */
    if (!PyArg_ParseTupleAndKeywords(args, kwds,
                                     discard_const_p(char, "s|kkksssO!O!"),
                                     discard_const_p(char *, kwlist),
                                     &username,
                                     &uid,
                                     &gid,
                                     &lock,
                                     &gecos,
                                     &home,
                                     &shell,
                                     &PyList_Type,
                                     &py_addgroups,
                                     &PyList_Type,
                                     &py_rmgroups)) {
        goto fail;
    }

    tctx = init_ctx(self->mem_ctx, self);
    if (!tctx) {
        PyErr_NoMemory();
        return NULL;
    }

    if (lock && lock != DO_LOCK && lock != DO_UNLOCK) {
        PyErr_SetString(PyExc_ValueError,
                        "Unkown value for lock parameter");
        goto fail;
    }

    if (py_addgroups != Py_None) {
        tctx->octx->addgroups = PyList_AsStringList(tctx,
                                                    py_addgroups,
                                                    "addgroups");
        if (!tctx->octx->addgroups) {
            return NULL;
        }
    }

    if (py_rmgroups != Py_None) {
        tctx->octx->rmgroups = PyList_AsStringList(tctx,
                                                   py_rmgroups,
                                                   "rmgroups");
        if (!tctx->octx->rmgroups) {
            return NULL;
        }
    }

    tctx->octx->name  = username;
    tctx->octx->uid   = uid;
    tctx->octx->gid   = gid;
    tctx->octx->gecos = gecos;
    tctx->octx->home  = home;
    tctx->octx->shell = shell;
    tctx->octx->lock  = lock;

    /* Modify the user within a transaction */
    start_transaction(tctx);
    if (tctx->error != EOK) {
        PyErr_SetSssError(tctx->error);
        goto fail;
    }

    /* usermod */
    ret = usermod(tctx, self->ev,
                  self->sysdb, tctx->handle, tctx->octx);
    if (ret != EOK) {
        tctx->error = ret;

        /* cancel transaction */
        talloc_zfree(tctx->handle);
        PyErr_SetSssError(tctx->error);
        goto fail;
    }

    end_transaction(tctx);
    if (tctx->error) {
        PyErr_SetSssError(tctx->error);
        goto fail;
    }

    talloc_zfree(tctx);
    Py_RETURN_NONE;

fail:
    talloc_zfree(tctx);
    return NULL;
}

/*
 * Add a group
 */
PyDoc_STRVAR(py_sss_groupadd__doc__,
    "Add a group.\n\n"
    ":param groupname: Name of group being added\n\n"
    ":param kwargs: Keyword arguments ro customize the operation\n\n"
    "* groupmod can be customized further with keyword arguments:\n"
    "   * ``gid``: The GID of the group\n");

static PyObject *py_sss_groupadd(PySssLocalObject *self,
                                 PyObject *args,
                                 PyObject *kwds)
{
    struct tools_ctx *tctx = NULL;
    char *groupname;
    unsigned long gid = 0;
    int ret;
    const char * const kwlist[] = { "groupname", "gid", NULL };

    /* parse arguments */
    if (!PyArg_ParseTupleAndKeywords(args, kwds,
                                     discard_const_p(char, "s|k"),
                                     discard_const_p(char *, kwlist),
                                     &groupname,
                                     &gid)) {
        goto fail;
    }

    tctx = init_ctx(self->mem_ctx, self);
    if (!tctx) {
        PyErr_NoMemory();
        return NULL;
    }

    tctx->octx->name = groupname;
    tctx->octx->gid = gid;

    /* Add the group within a transaction */
    start_transaction(tctx);
    if (tctx->error != EOK) {
        PyErr_SetSssError(tctx->error);
        goto fail;
    }

    /* groupadd */
    ret = groupadd(tctx, self->ev,
                   self->sysdb, tctx->handle, tctx->octx);
    if (ret != EOK) {
        tctx->error = ret;

        /* cancel transaction */
        talloc_zfree(tctx->handle);
        PyErr_SetSssError(tctx->error);
        goto fail;
    }

    end_transaction(tctx);
    if (tctx->error) {
        PyErr_SetSssError(tctx->error);
        goto fail;
    }

    talloc_zfree(tctx);
    Py_RETURN_NONE;

fail:
    talloc_zfree(tctx);
    return NULL;
}

/*
 * Delete a group
 */
PyDoc_STRVAR(py_sss_groupdel__doc__,
    "Remove a group.\n\n"
    ":param groupname: Name of group being removed\n");

static PyObject *py_sss_groupdel(PySssLocalObject *self,
                                PyObject *args,
                                PyObject *kwds)
{
    struct tools_ctx *tctx = NULL;
    char *groupname = NULL;
    int ret;

    if(!PyArg_ParseTuple(args, discard_const_p(char, "s"), &groupname)) {
        goto fail;
    }

    tctx = init_ctx(self->mem_ctx, self);
    if (!tctx) {
        PyErr_NoMemory();
        return NULL;
    }

    tctx->octx->name = groupname;

    /* Remove the group within a transaction */
    start_transaction(tctx);
    if (tctx->error != EOK) {
        PyErr_SetSssError(tctx->error);
        goto fail;
    }

    /* groupdel */
    ret = groupdel(tctx, self->ev,
                   self->sysdb, tctx->handle, tctx->octx);
    if (ret != EOK) {
        tctx->error = ret;

        /* cancel transaction */
        talloc_zfree(tctx->handle);
        PyErr_SetSssError(tctx->error);
        goto fail;
    }

    end_transaction(tctx);
    if (tctx->error) {
        PyErr_SetSssError(tctx->error);
        goto fail;
    }

    talloc_zfree(tctx);
    Py_RETURN_NONE;

fail:
    talloc_zfree(tctx);
    return NULL;
}

/*
 * Modify a group
 */
PyDoc_STRVAR(py_sss_groupmod__doc__,
"Modify a group.\n\n"
":param groupname: Name of group being modified\n\n"
":param kwargs: Keyword arguments ro customize the operation\n\n"
"* groupmod can be customized further with keyword arguments:\n"
"   * ``gid``: The GID of the group\n\n"
"   * ``addgroups``: Groups to add the group to\n\n"
"   * ``rmgroups``: Groups to remove the group from\n\n");

static PyObject *py_sss_groupmod(PySssLocalObject *self,
                                PyObject *args,
                                PyObject *kwds)
{
    struct tools_ctx *tctx = NULL;
    int ret;
    PyObject *py_addgroups = Py_None;
    PyObject *py_rmgroups = Py_None;
    unsigned long gid = 0;
    char *groupname = NULL;
    const char * const kwlist[] = { "groupname", "gid", "addgroups",
                                    "rmgroups", NULL };

    /* parse arguments */
    if (!PyArg_ParseTupleAndKeywords(args, kwds,
                                     discard_const_p(char, "s|kO!O!"),
                                     discard_const_p(char *, kwlist),
                                     &groupname,
                                     &gid,
                                     &PyList_Type,
                                     &py_addgroups,
                                     &PyList_Type,
                                     &py_rmgroups)) {
        goto fail;
    }

    tctx = init_ctx(self->mem_ctx, self);
    if (!tctx) {
        PyErr_NoMemory();
        return NULL;
    }

    if (py_addgroups != Py_None) {
        tctx->octx->addgroups = PyList_AsStringList(tctx,
                                             py_addgroups,
                                             "addgroups");
        if (!tctx->octx->addgroups) {
            return NULL;
        }
    }

    if (py_rmgroups != Py_None) {
        tctx->octx->rmgroups = PyList_AsStringList(tctx,
                                            py_rmgroups,
                                            "rmgroups");
        if (!tctx->octx->rmgroups) {
            return NULL;
        }
    }

    tctx->octx->name = groupname;
    tctx->octx->gid = gid;

    /* Modify the group within a transaction */
    start_transaction(tctx);
    if (tctx->error != EOK) {
        PyErr_SetSssError(tctx->error);
        goto fail;
    }

    /* groupmod */
    ret = groupmod(tctx, self->ev,
                   self->sysdb, tctx->handle, tctx->octx);
    if (ret != EOK) {
        tctx->error = ret;

        /* cancel transaction */
        talloc_zfree(tctx->handle);
        PyErr_SetSssError(tctx->error);
        goto fail;
    }

    end_transaction(tctx);
    if (tctx->error) {
        PyErr_SetSssError(tctx->error);
        goto fail;
    }

    talloc_zfree(tctx);
    Py_RETURN_NONE;

fail:
    talloc_zfree(tctx);
    return NULL;
}


/*** python plumbing begins here ***/

/*
 * The sss.local destructor
 */
static void PySssLocalObject_dealloc(PySssLocalObject *self)
{
    talloc_free(self->mem_ctx);
    self->ob_type->tp_free((PyObject*) self);
}

/*
 * The sss.local constructor
 */
static PyObject *PySssLocalObject_new(PyTypeObject *type,
                                      PyObject *args,
                                      PyObject *kwds)
{
    TALLOC_CTX *mem_ctx;
    PySssLocalObject *self;
    char *confdb_path;
    int ret;

    mem_ctx = talloc_new(NULL);
    if (mem_ctx == NULL) {
        PyErr_NoMemory();
        return NULL;
    }

    self = (PySssLocalObject *) type->tp_alloc(type, 0);
    if (self == NULL) {
        talloc_free(mem_ctx);
        PyErr_NoMemory();
        return NULL;
    }
    self->mem_ctx = mem_ctx;

    self->ev = tevent_context_init(mem_ctx);
    if (self->ev == NULL) {
        talloc_free(mem_ctx);
        PyErr_SetSssErrorWithMessage(EIO, "Cannot create event context");
        return NULL;
    }

    confdb_path = talloc_asprintf(self->mem_ctx, "%s/%s", DB_PATH, CONFDB_FILE);
    if (confdb_path == NULL) {
        talloc_free(mem_ctx);
        PyErr_NoMemory();
        return NULL;
    }

    /* Connect to the conf db */
    ret = confdb_init(self->mem_ctx, &self->confdb, confdb_path);
    if (ret != EOK) {
        talloc_free(mem_ctx);
        PyErr_SetSssErrorWithMessage(ret,
                "Could not initialize connection to the confdb\n");
        return NULL;
    }

    ret = confdb_get_domain(self->confdb, "local", &self->local);
    if (ret != EOK) {
        talloc_free(mem_ctx);
        PyErr_SetSssErrorWithMessage(ret, "Cannot get local domain");
        return NULL;
    }

    /* open 'local' sysdb at default path */
    ret = sysdb_domain_init(self->mem_ctx, self->ev, self->local, DB_PATH, &self->sysdb);
    if (ret != EOK) {
        talloc_free(mem_ctx);
        PyErr_SetSssErrorWithMessage(ret,
                "Could not initialize connection to the sysdb\n");
        return NULL;
    }

    self->lock = DO_LOCK;
    self->unlock = DO_UNLOCK;

    return (PyObject *) self;
}

/*
 * sss.local object methods
 */
static PyMethodDef sss_local_methods[] = {
    { "useradd", (PyCFunction) py_sss_useradd,
      METH_KEYWORDS, py_sss_useradd__doc__
    },
    { "userdel", (PyCFunction) py_sss_userdel,
      METH_KEYWORDS, py_sss_userdel__doc__
    },
    { "usermod", (PyCFunction) py_sss_usermod,
      METH_KEYWORDS, py_sss_usermod__doc__
    },
    { "groupadd", (PyCFunction) py_sss_groupadd,
      METH_KEYWORDS, py_sss_groupadd__doc__
    },
    { "groupdel", (PyCFunction) py_sss_groupdel,
      METH_KEYWORDS, py_sss_groupdel__doc__
    },
    { "groupmod", (PyCFunction) py_sss_groupmod,
      METH_KEYWORDS, py_sss_groupmod__doc__
    },
    {NULL, NULL, 0, NULL}        /* Sentinel */
};

static PyMemberDef sss_members[] = {
    { discard_const_p(char, "lock"), T_INT,
      offsetof(PySssLocalObject, lock), RO },
    { discard_const_p(char, "unlock"), T_INT,
      offsetof(PySssLocalObject, unlock), RO },
    {NULL} /* Sentinel */
};

/*
 * sss.local object properties
 */
static PyTypeObject pysss_local_type = {
    PyObject_HEAD_INIT(NULL)
    .tp_name = "sss.local",
    .tp_basicsize = sizeof(PySssLocalObject),
    .tp_new = PySssLocalObject_new,
    .tp_dealloc = (destructor) PySssLocalObject_dealloc,
    .tp_methods = sss_local_methods,
    .tp_members = sss_members,
    .tp_flags = Py_TPFLAGS_DEFAULT | Py_TPFLAGS_BASETYPE,
    .tp_doc   = "SSS DB manipulation",
};

/*
 * Module methods
 */
static PyMethodDef module_methods[] = {
        {NULL}  /* Sentinel */
};

/*
 * Module initialization
 */
PyMODINIT_FUNC
initpysss(void)
{
    PyObject *m;

    if (PyType_Ready(&pysss_local_type) < 0)
        return;

    m = Py_InitModule(discard_const_p(char, "pysss"), module_methods);
    if (m == NULL)
        return;

    Py_INCREF(&pysss_local_type);
    PyModule_AddObject(m, discard_const_p(char, "local"), (PyObject *)&pysss_local_type);
}