summaryrefslogtreecommitdiff
path: root/src/providers/ldap/sdap_async_initgroups_ad.c
blob: c2dec37363e3138128b059d616ab82d7f337e01f (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
/*
    SSSD

    Authors:
        Stephen Gallagher <sgallagh@redhat.com>

    Copyright (C) 2012 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 "util/util.h"
#include "providers/ldap/sdap_async.h"
#include "providers/ldap/ldap_common.h"
#include "providers/ldap/sdap_async_private.h"
#include "providers/ldap/sdap_idmap.h"
#include "lib/idmap/sss_idmap.h"

struct sdap_ad_match_rule_initgr_state {
    struct tevent_context *ev;
    struct sdap_options *opts;
    struct sysdb_ctx *sysdb;
    struct sss_domain_info *domain;
    struct sdap_handle *sh;
    const char *name;
    const char *orig_dn;
    const char **attrs;
    int timeout;
    const char *base_filter;
    char *filter;

    size_t count;
    struct sysdb_attrs **groups;

    size_t base_iter;
    struct sdap_search_base **search_bases;
};

static errno_t
sdap_get_ad_match_rule_initgroups_next_base(struct tevent_req *req);

static void
sdap_get_ad_match_rule_initgroups_step(struct tevent_req *subreq);

struct tevent_req *
sdap_get_ad_match_rule_initgroups_send(TALLOC_CTX *mem_ctx,
                                       struct tevent_context *ev,
                                       struct sdap_options *opts,
                                       struct sysdb_ctx *sysdb,
                                       struct sss_domain_info *domain,
                                       struct sdap_handle *sh,
                                       const char *name,
                                       const char *orig_dn,
                                       int timeout)
{
    errno_t ret;
    struct tevent_req *req;
    struct sdap_ad_match_rule_initgr_state *state;
    const char **filter_members;
    char *sanitized_user_dn;

    req = tevent_req_create(mem_ctx, &state,
                            struct sdap_ad_match_rule_initgr_state);
    if (!req) return NULL;

    state->ev = ev;
    state->opts = opts;
    state->sysdb = sysdb;
    state->domain = domain;
    state->sh = sh;
    state->name = name;
    state->orig_dn = orig_dn;
    state->base_iter = 0;
    state->search_bases = opts->group_search_bases;

    /* Request all of the group attributes that we know
     * about, except for 'member' because that wastes a
     * lot of bandwidth here and we only really
     * care about a single member (the one we already
     * have).
     */
    filter_members = talloc_array(state, const char *, 2);
    if (!filter_members) {
        ret = ENOMEM;
        goto immediate;
    }
    filter_members[0] = opts->group_map[SDAP_AT_GROUP_MEMBER].name;
    filter_members[1] = NULL;

    ret = build_attrs_from_map(state, opts->group_map,
                               SDAP_OPTS_GROUP,
                               filter_members,
                               &state->attrs, NULL);
    if (ret != EOK) {
        DEBUG(SSSDBG_MINOR_FAILURE,
              ("Could not build attribute map: [%s]\n",
               strerror(ret)));
        goto immediate;
    }

    /* Sanitize the user DN in case we have special characters in DN */
    ret = sss_filter_sanitize(state, state->orig_dn, &sanitized_user_dn);
    if (ret != EOK) {
        DEBUG(SSSDBG_MINOR_FAILURE,
              ("Could not sanitize user DN: %s\n",
               strerror(ret)));
        goto immediate;
    }

    /* Craft a special filter according to
     * http://msdn.microsoft.com/en-us/library/windows/desktop/aa746475%28v=vs.85%29.aspx
     */
    state->base_filter =
            talloc_asprintf(state,
                            "(&(%s:%s:=%s)(objectClass=%s))",
                            state->opts->group_map[SDAP_AT_GROUP_MEMBER].name,
                            SDAP_MATCHING_RULE_IN_CHAIN,
                            sanitized_user_dn,
                            state->opts->group_map[SDAP_OC_GROUP].name);
    talloc_zfree(sanitized_user_dn);
    if (!state->base_filter) {
        ret = ENOMEM;
        goto immediate;
    }

    /* Start the loop through the search bases to get all of the
     * groups to which this user belongs.
     */
    ret = sdap_get_ad_match_rule_initgroups_next_base(req);
    if (ret != EOK) {
        DEBUG(SSSDBG_MINOR_FAILURE,
              ("sdap_get_ad_match_rule_members_next_base failed: [%s]\n",
               strerror(ret)));
        goto immediate;
    }

    return req;

immediate:
    tevent_req_error(req, ret);
    tevent_req_post(req, ev);
    return req;
}

static errno_t
sdap_get_ad_match_rule_initgroups_next_base(struct tevent_req *req)
{
    struct tevent_req *subreq;
    struct sdap_ad_match_rule_initgr_state *state;

    state = tevent_req_data(req, struct sdap_ad_match_rule_initgr_state);

    talloc_zfree(state->filter);
    state->filter = sdap_get_id_specific_filter(state,
                        state->base_filter,
                        state->search_bases[state->base_iter]->filter);
    if (!state->filter) {
        return ENOMEM;
    }

    DEBUG(SSSDBG_TRACE_FUNC,
          ("Searching for groups with base [%s]\n",
           state->search_bases[state->base_iter]->basedn));

    subreq = sdap_get_generic_send(
            state, state->ev, state->opts, state->sh,
            state->search_bases[state->base_iter]->basedn,
            state->search_bases[state->base_iter]->scope,
            state->filter, state->attrs,
            state->opts->group_map, SDAP_OPTS_GROUP,
            state->timeout, true);
    if (!subreq) {
        return ENOMEM;
    }

    tevent_req_set_callback(subreq,
                            sdap_get_ad_match_rule_initgroups_step,
                            req);

    return EOK;
}

static void
sdap_get_ad_match_rule_initgroups_step(struct tevent_req *subreq)
{
    errno_t ret;
    struct tevent_req *req =
            tevent_req_callback_data(subreq, struct tevent_req);
    struct sdap_ad_match_rule_initgr_state *state =
            tevent_req_data(req, struct sdap_ad_match_rule_initgr_state);
    size_t count, i;
    struct sysdb_attrs **groups;
    char **sysdb_grouplist;

    ret = sdap_get_generic_recv(subreq, state, &count, &groups);
    talloc_zfree(subreq);
    if (ret != EOK) {
        DEBUG(SSSDBG_MINOR_FAILURE,
              ("LDAP search failed: [%s]\n", strerror(ret)));
        goto error;
    }

    DEBUG(SSSDBG_TRACE_LIBS,
          ("Search for users returned %d results\n", count));

    /* Add this batch of groups to the list */
    if (count > 0) {
        state->groups = talloc_realloc(state, state->groups,
                                      struct sysdb_attrs *,
                                      state->count + count + 1);
        if (!state->groups) {
            tevent_req_error(req, ENOMEM);
            return;
        }

        /* Copy the new groups into the list */
        for (i = 0; i < count; i++) {
            state->groups[state->count + i] =
                    talloc_steal(state->groups, groups[i]);
        }

        state->count += count;
        state->groups[state->count] = NULL;
    }

    /* Continue checking other search bases */
    state->base_iter++;
    if (state->search_bases[state->base_iter]) {
        /* There are more search bases to try */
        ret = sdap_get_ad_match_rule_initgroups_next_base(req);
        if (ret != EOK) {
            goto error;
        }
        return;
    }

    /* No more search bases. Save the groups. */

    if (state->count == 0) {
        DEBUG(SSSDBG_TRACE_LIBS,
              ("User is not a member of any group in the search bases\n"));
    }

    /* Get the current sysdb group list for this user
     * so we can update it.
     */
    ret = get_sysdb_grouplist(state, state->sysdb, state->domain,
                              state->name, &sysdb_grouplist);
    if (ret != EOK) {
        DEBUG(SSSDBG_MINOR_FAILURE,
              ("Could not get the list of groups for [%s] in the sysdb: "
               "[%s]\n",
               state->name, strerror(ret)));
        goto error;
    }

    /* The extensibleMatch search rule eliminates the need for
     * nested group searches, so we can just update the
     * memberships now.
     */
    ret = sdap_initgr_common_store(state->sysdb,
                                   state->domain,
                                   state->opts,
                                   state->name,
                                   SYSDB_MEMBER_USER,
                                   sysdb_grouplist,
                                   state->groups,
                                   state->count);
    if (ret != EOK) {
        DEBUG(SSSDBG_MINOR_FAILURE,
              ("Could not store groups for user [%s]: [%s]\n",
               state->name, strerror(ret)));
        goto error;
    }

    tevent_req_done(req);
    return;

error:
    tevent_req_error(req, ret);
}

errno_t
sdap_get_ad_match_rule_initgroups_recv(struct tevent_req *req)
{
    TEVENT_REQ_RETURN_ON_ERROR(req);
    return EOK;
}

struct sdap_ad_tokengroups_initgr_state {
    struct tevent_context *ev;
    struct sdap_options *opts;
    struct sysdb_ctx *sysdb;
    struct sss_domain_info *domain;
    struct sdap_handle *sh;
    const char *username;
};

static void
sdap_get_ad_tokengroups_initgroups_lookup_done(struct tevent_req *req);

struct tevent_req *
sdap_get_ad_tokengroups_initgroups_send(TALLOC_CTX *mem_ctx,
                                        struct tevent_context *ev,
                                        struct sdap_options *opts,
                                        struct sysdb_ctx *sysdb,
                                        struct sss_domain_info *domain,
                                        struct sdap_handle *sh,
                                        const char *name,
                                        const char *orig_dn,
                                        int timeout)
{
    struct tevent_req *req;
    struct tevent_req *subreq;
    struct sdap_ad_tokengroups_initgr_state *state;
    const char *attrs[] = {AD_TOKENGROUPS_ATTR, NULL};

    req = tevent_req_create(mem_ctx, &state,
                            struct sdap_ad_tokengroups_initgr_state);
    if (!req) return NULL;

    state->ev = ev;
    state->opts = opts;
    state->sysdb = sysdb;
    state->domain = domain;
    state->sh = sh;
    state->username = name;

    subreq = sdap_get_generic_send(
            state, state->ev, state->opts, state->sh,
            orig_dn, LDAP_SCOPE_BASE, NULL, attrs,
            NULL, 0, timeout, false);
    if (!subreq) {
        tevent_req_error(req, ENOMEM);
        tevent_req_post(req, ev);
        return req;
    }

    tevent_req_set_callback(subreq,
                            sdap_get_ad_tokengroups_initgroups_lookup_done,
                            req);
    return req;
}

static void
sdap_get_ad_tokengroups_initgroups_lookup_done(struct tevent_req *subreq)
{
    errno_t ret, sret;
    enum idmap_error_code err;
    size_t user_count, group_count, i;
    TALLOC_CTX *tmp_ctx;
    bool in_transaction = false;
    char *sid_str;
    gid_t gid;
    time_t now;
    struct sysdb_attrs **users;
    struct ldb_message_element *el;
    struct ldb_message *msg;
    char **ldap_grouplist;
    char **sysdb_grouplist;
    char **add_groups;
    char **del_groups;
    const char *attrs[] = { SYSDB_NAME, NULL };
    const char *group_name;
    struct tevent_req *req =
            tevent_req_callback_data(subreq, struct tevent_req);
    struct sdap_ad_tokengroups_initgr_state *state =
            tevent_req_data(req, struct sdap_ad_tokengroups_initgr_state);

    tmp_ctx = talloc_new(NULL);
    if (!tmp_ctx) {
        ret = ENOMEM;
        goto done;
    }

    ret = sdap_get_generic_recv(subreq, tmp_ctx, &user_count, &users);
    talloc_zfree(subreq);
    if (ret != EOK) {
        DEBUG(SSSDBG_MINOR_FAILURE,
              ("LDAP search failed: [%s]\n", strerror(ret)));
        goto done;
    }

    if (user_count != 1) {
        DEBUG(SSSDBG_MINOR_FAILURE,
              ("More than one result on a base search!\n"));
        ret = EINVAL;
        goto done;
    }

    /* Get the list of group SIDs */
    ret = sysdb_attrs_get_el_ext(users[0], AD_TOKENGROUPS_ATTR,
                                 false, &el);
    if (ret != EOK) {
        if (ret == ENOENT) {
            DEBUG(SSSDBG_TRACE_LIBS,
                  ("No tokenGroups entries for [%s]\n",
                   state->username));
            /* No groups in LDAP. We need to ensure that the
             * sysdb matches.
             */
            el = talloc_zero(tmp_ctx, struct ldb_message_element);
            if (!el) {
                ret = ENOMEM;
                goto done;
            }
            el->num_values = 0;

            /* This will skip the group-processing loop below
             * and proceed to removing any sysdb groups.
             */
        } else {
            DEBUG(SSSDBG_MINOR_FAILURE,
                  ("Could not read tokenGroups attribute: [%s]\n",
                   strerror(ret)));
            goto done;
        }
    }

    /* Process the groups */
    now = time(NULL);

    ret = sysdb_transaction_start(state->sysdb);
    if (ret != EOK) goto done;
    in_transaction = true;

    ldap_grouplist = talloc_array(tmp_ctx, char *, el->num_values + 1);
    if (!ldap_grouplist) {
        ret = ENOMEM;
        goto done;
    }
    group_count = 0;

    for (i = 0; i < el->num_values; i++) {
        /* Get the SID and convert it to a GID */

        err = sss_idmap_bin_sid_to_sid(state->opts->idmap_ctx->map,
                                        el->values[i].data,
                                        el->values[i].length,
                                        &sid_str);
        if (err != IDMAP_SUCCESS) {
            DEBUG(SSSDBG_MINOR_FAILURE,
                  ("Could not convert binary SID to string: [%s]. Skipping\n",
                   idmap_error_string(err)));
            continue;
        }
        DEBUG(SSSDBG_TRACE_LIBS,
              ("Processing membership SID [%s]\n",
               sid_str));
        ret = sdap_idmap_sid_to_unix(state->opts->idmap_ctx, sid_str,
                                     &gid);
        if (ret == ENOTSUP) {
            DEBUG(SSSDBG_TRACE_FUNC, ("Skipping built-in object.\n"));
            ret = EOK;
            continue;
        } else if (ret != EOK) {
            DEBUG(SSSDBG_MINOR_FAILURE,
                  ("Could not convert SID to GID: [%s]. Skipping\n",
                   strerror(ret)));
            continue;
        }

        DEBUG(SSSDBG_TRACE_LIBS,
              ("Processing membership GID [%lu]\n",
               gid));

        /* Check whether this GID already exists in the sysdb */
        ret = sysdb_search_group_by_gid(tmp_ctx, state->sysdb, state->domain,
                                        gid, attrs, &msg);
        if (ret == EOK) {
            group_name = ldb_msg_find_attr_as_string(msg, SYSDB_NAME, NULL);
            if (!group_name) {
                DEBUG(SSSDBG_MINOR_FAILURE,
                      ("Could not retrieve group name from sysdb\n"));
                ret = EINVAL;
                goto done;
            }
        } else if (ret == ENOENT) {
            /* This is a new group. For now, we will store it
             * under the name of its SID. When a direct lookup of
             * the group or its GID occurs, it will replace this
             * temporary entry.
             */
            group_name = sid_str;
            ret = sysdb_add_incomplete_group(state->sysdb,
                                             state->domain,
                                             group_name, gid,
                                             NULL, false, now);
            if (ret != EOK) {
                DEBUG(SSSDBG_MINOR_FAILURE,
                      ("Could not create incomplete group: [%s]\n",
                       strerror(ret)));
                goto done;
            }
        } else {
            /* Unexpected error */
            DEBUG(SSSDBG_MINOR_FAILURE,
                  ("Could not look up group in sysdb: [%s]\n",
                   strerror(ret)));
            goto done;
        }

        ldap_grouplist[group_count] =
                talloc_strdup(ldap_grouplist, group_name);
        if (!ldap_grouplist[group_count]) {
            ret = ENOMEM;
            goto done;
        }

        group_count++;
    }
    ldap_grouplist[group_count] = NULL;

    /* Get the current sysdb group list for this user
     * so we can update it.
     */
    ret = get_sysdb_grouplist(state, state->sysdb, state->domain,
                              state->username, &sysdb_grouplist);
    if (ret != EOK) {
        DEBUG(SSSDBG_MINOR_FAILURE,
              ("Could not get the list of groups for [%s] in the sysdb: "
               "[%s]\n",
               state->username, strerror(ret)));
        goto done;
    }

    /* Find the differences between the sysdb and LDAP lists
     * Groups in the sysdb only must be removed.
     */
    ret = diff_string_lists(tmp_ctx, ldap_grouplist, sysdb_grouplist,
                            &add_groups, &del_groups, NULL);
    if (ret != EOK) goto done;

    DEBUG(SSSDBG_TRACE_LIBS,
          ("Updating memberships for [%s]\n", state->username));
    ret = sysdb_update_members(state->sysdb, state->domain,
                               state->username, SYSDB_MEMBER_USER,
                               (const char *const *) add_groups,
                               (const char *const *) del_groups);
    if (ret != EOK) {
        DEBUG(SSSDBG_MINOR_FAILURE,
              ("Membership update failed [%d]: %s\n",
               ret, strerror(ret)));
        goto done;
    }

    ret = sysdb_transaction_commit(state->sysdb);
    if (ret != EOK) {
        DEBUG(SSSDBG_CRIT_FAILURE,
              ("Could not commit transaction! [%s]\n",
               strerror(ret)));
        goto done;
    }
    in_transaction = false;

done:
    if (in_transaction) {
        sret = sysdb_transaction_cancel(state->sysdb);
        DEBUG(SSSDBG_FATAL_FAILURE,
              ("Could not cancel transaction! [%s]\n",
               strerror(sret)));
    }

    if (ret == EOK) {
        tevent_req_done(req);
    } else {
        tevent_req_error(req, ret);
    }
    talloc_free(tmp_ctx);
    return;
}

errno_t
sdap_get_ad_tokengroups_initgroups_recv(struct tevent_req *req)
{
    TEVENT_REQ_RETURN_ON_ERROR(req);
    return EOK;
}