summaryrefslogtreecommitdiff
path: root/src/providers/ldap/ldap_id_cleanup.c
blob: 60bc171cba01e4e00032775a3675b0d073b185f7 (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
/*
    SSSD

    LDAP Identity Cleanup Functions

    Authors:
        Simo Sorce <ssorce@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 <errno.h>
#include <time.h>
#include <sys/time.h>

#include "util/util.h"
#include "util/find_uid.h"
#include "db/sysdb.h"
#include "providers/ldap/ldap_common.h"
#include "providers/ldap/sdap_async.h"

/* ==Cleanup-Task========================================================= */

struct tevent_req *ldap_id_cleanup_send(TALLOC_CTX *memctx,
                                        struct tevent_context *ev,
                                        struct sdap_id_ctx *ctx);
static void ldap_id_cleanup_reschedule(struct tevent_req *req);

static void ldap_id_cleanup_timeout(struct tevent_context *ev,
                                      struct tevent_timer *te,
                                      struct timeval tv, void *pvt);

static void ldap_id_cleanup_timer(struct tevent_context *ev,
                                  struct tevent_timer *tt,
                                  struct timeval tv, void *pvt)
{
    struct sdap_id_ctx *ctx = talloc_get_type(pvt, struct sdap_id_ctx);
    struct tevent_timer *timeout;
    struct tevent_req *req;
    int delay;
    errno_t ret;

    if (be_is_offline(ctx->be)) {
        DEBUG(4, ("Backend is marked offline, retry later!\n"));
        /* schedule starting from now, not the last run */
        delay = dp_opt_get_int(ctx->opts->basic, SDAP_CACHE_PURGE_TIMEOUT);
        tv = tevent_timeval_current_ofs(delay, 0);
        ldap_id_cleanup_set_timer(ctx, tv);
        return;
    }

    req = ldap_id_cleanup_send(ctx, ev, ctx);
    if (!req) {
        DEBUG(1, ("Failed to schedule cleanup, retrying later!\n"));
        /* schedule starting from now, not the last run */
        delay = dp_opt_get_int(ctx->opts->basic, SDAP_CACHE_PURGE_TIMEOUT);
        tv = tevent_timeval_current_ofs(delay, 0);
        ret = ldap_id_cleanup_set_timer(ctx, tv);
        if (ret != EOK) {
            DEBUG(1, ("Error setting up cleanup timer\n"));
        }
        return;
    }
    tevent_req_set_callback(req, ldap_id_cleanup_reschedule, ctx);

    /* if cleanup takes so long, either we try to cleanup too
     * frequently, or something went seriously wrong */
    delay = dp_opt_get_int(ctx->opts->basic, SDAP_CACHE_PURGE_TIMEOUT);
    tv = tevent_timeval_current_ofs(delay, 0);
    timeout = tevent_add_timer(ctx->be->ev, req, tv,
                               ldap_id_cleanup_timeout, req);
    if (timeout == NULL) {
        /* If we can't guarantee a timeout, we
         * need to cancel the request, to avoid
         * the possibility of starting another
         * concurrently
         */
        talloc_zfree(req);

        DEBUG(1, ("Failed to schedule cleanup, retrying later!\n"));
        /* schedule starting from now, not the last run */
        delay = dp_opt_get_int(ctx->opts->basic, SDAP_CACHE_PURGE_TIMEOUT);
        tv = tevent_timeval_current_ofs(delay, 0);
        ret = ldap_id_cleanup_set_timer(ctx, tv);
        if (ret != EOK) {
            DEBUG(1, ("Error setting up cleanup timer\n"));
        }
        return;
    }
    return;
}

static void ldap_id_cleanup_timeout(struct tevent_context *ev,
                                      struct tevent_timer *te,
                                      struct timeval tv, void *pvt)
{
    struct tevent_req *req = talloc_get_type(pvt, struct tevent_req);
    struct sdap_id_ctx *ctx = tevent_req_callback_data(req,
                                                       struct sdap_id_ctx);
    int delay;

    delay = dp_opt_get_int(ctx->opts->basic, SDAP_CACHE_PURGE_TIMEOUT);
    DEBUG(1, ("Cleanup timed out! Timeout too small? (%ds)!\n", delay));

    tv = tevent_timeval_current_ofs(delay, 0);
    ldap_id_cleanup_set_timer(ctx, tv);

    talloc_zfree(req);
}

static void ldap_id_cleanup_reschedule(struct tevent_req *req)
{
    struct sdap_id_ctx *ctx = tevent_req_callback_data(req,
                                                       struct sdap_id_ctx);
    enum tevent_req_state tstate;
    uint64_t err;
    struct timeval tv;
    int delay;

    if (tevent_req_is_error(req, &tstate, &err)) {
        /* On error schedule starting from now, not the last run */
        tv = tevent_timeval_current();
    } else {
        tv = ctx->last_purge;
    }
    talloc_zfree(req);

    delay = dp_opt_get_int(ctx->opts->basic, SDAP_CACHE_PURGE_TIMEOUT);
    tv = tevent_timeval_add(&tv, delay, 0);
    ldap_id_cleanup_set_timer(ctx, tv);
}



int ldap_id_cleanup_set_timer(struct sdap_id_ctx *ctx, struct timeval tv)
{
    struct tevent_timer *cleanup_task;

    DEBUG(6, ("Scheduling next cleanup at %ld.%ld\n",
              (long)tv.tv_sec, (long)tv.tv_usec));

    cleanup_task = tevent_add_timer(ctx->be->ev, ctx,
                                    tv, ldap_id_cleanup_timer, ctx);
    if (!cleanup_task) {
        DEBUG(0, ("FATAL: failed to setup cleanup task!\n"));
        return EFAULT;
    }

    return EOK;
}



struct global_cleanup_state {
    struct tevent_context *ev;
    struct sdap_id_ctx *ctx;
};

static int cleanup_users(TALLOC_CTX *memctx, struct sdap_id_ctx *ctx);
static int cleanup_groups(TALLOC_CTX *memctx,
                          struct sysdb_ctx *sysdb,
                          struct sss_domain_info *domain);

struct tevent_req *ldap_id_cleanup_send(TALLOC_CTX *memctx,
                                        struct tevent_context *ev,
                                        struct sdap_id_ctx *ctx)
{
    struct global_cleanup_state *state;
    struct tevent_req *req;
    int ret;

    req = tevent_req_create(memctx, &state, struct global_cleanup_state);
    if (!req) return NULL;

    state->ev = ev;
    state->ctx = ctx;

    ctx->last_purge = tevent_timeval_current();

    ret = cleanup_users(state, state->ctx);
    if (ret && ret != ENOENT) {
        goto fail;
    }

    ret = cleanup_groups(state,
                         state->ctx->be->sysdb,
                         state->ctx->be->domain);
    if (ret) {
        goto fail;
    }

    tevent_req_done(req);
    tevent_req_post(req, ev);
    return req;

fail:
    DEBUG(1, ("Failed to cleanup caches (%d [%s]), retrying later!\n",
              (int)ret, strerror(ret)));
    tevent_req_done(req);
    tevent_req_post(req, ev);
    return req;
}


/* ==User-Cleanup-Process================================================= */

static int cleanup_users_logged_in(hash_table_t *table,
                                   const struct ldb_message *msg);

static int cleanup_users(TALLOC_CTX *memctx, struct sdap_id_ctx *ctx)
{
    TALLOC_CTX *tmpctx;
    struct sysdb_ctx *sysdb = ctx->be->sysdb;
    struct sss_domain_info *domain = ctx->be->domain;
    const char *attrs[] = { SYSDB_NAME, SYSDB_UIDNUM, NULL };
    time_t now = time(NULL);
    char *subfilter = NULL;
    int account_cache_expiration;
    hash_table_t *uid_table;
    struct ldb_message **msgs;
    size_t count;
    const char *name;
    int ret;
    int i;

    tmpctx = talloc_new(memctx);
    if (!tmpctx) {
        return ENOMEM;
    }

    account_cache_expiration = dp_opt_get_int(ctx->opts->basic,
                                           SDAP_ACCOUNT_CACHE_EXPIRATION);
    DEBUG(9, ("Cache expiration is set to %d days\n",
              account_cache_expiration));

    if (account_cache_expiration > 0) {
        subfilter = talloc_asprintf(tmpctx,
                                    "(&(!(%s=0))(%s<=%ld)(|(!(%s=*))(%s<=%ld)))",
                                    SYSDB_CACHE_EXPIRE,
                                    SYSDB_CACHE_EXPIRE,
                                    (long) now,
                                    SYSDB_LAST_LOGIN,
                                    SYSDB_LAST_LOGIN,
                                    (long) (now - (account_cache_expiration * 86400)));
    } else {
        subfilter = talloc_asprintf(tmpctx,
                                    "(&(!(%s=0))(%s<=%ld)(!(%s=*)))",
                                    SYSDB_CACHE_EXPIRE,
                                    SYSDB_CACHE_EXPIRE,
                                    (long) now,
                                    SYSDB_LAST_LOGIN);
    }
    if (!subfilter) {
        DEBUG(2, ("Failed to build filter\n"));
        ret = ENOMEM;
        goto done;
    }

    ret = sysdb_search_users(tmpctx, sysdb,
                             domain, subfilter, attrs, &count, &msgs);
    if (ret) {
        if (ret == ENOENT) {
            ret = EOK;
        }
        goto done;
    }

    DEBUG(4, ("Found %d expired user entries!\n", count));

    if (count == 0) {
        ret = EOK;
        goto done;
    }

    ret = get_uid_table(tmpctx, &uid_table);
    /* get_uid_table returns ENOSYS on non-Linux platforms. We proceed with
     * the cleanup in that case
     */
    if (ret != EOK && ret != ENOSYS) {
        goto done;
    }

    for (i = 0; i < count; i++) {
        name = ldb_msg_find_attr_as_string(msgs[i], SYSDB_NAME, NULL);
        if (!name) {
            DEBUG(2, ("Entry %s has no Name Attribute ?!?\n",
                       ldb_dn_get_linearized(msgs[i]->dn)));
            ret = EFAULT;
            goto done;
        }

        if (uid_table) {
            ret = cleanup_users_logged_in(uid_table, msgs[i]);
            if (ret == EOK) {
                /* If the user is logged in, proceed to the next one */
                DEBUG(5, ("User %s is still logged in, keeping data\n", name));
                continue;
            } else if (ret != ENOENT) {
                goto done;
            }
        }

        /* If not logged in or cannot check the table, delete him */
        DEBUG(9, ("About to delete user %s\n", name));
        ret = sysdb_delete_user(tmpctx, sysdb, domain, name, 0);
        if (ret) {
            goto done;
        }
    }

done:
    talloc_zfree(tmpctx);
    return ret;
}

static int cleanup_users_logged_in(hash_table_t *table,
                                   const struct ldb_message *msg)
{
    uid_t      uid;
    hash_key_t key;
    hash_value_t value;
    int        ret;

    uid = ldb_msg_find_attr_as_uint64(msg,
                                      SYSDB_UIDNUM, 0);
    if (!uid) {
        DEBUG(2, ("Entry %s has no UID Attribute ?!?\n",
                  ldb_dn_get_linearized(msg->dn)));
        return EFAULT;
    }

    key.type = HASH_KEY_ULONG;
    key.ul   = (unsigned long) uid;

    ret = hash_lookup(table, &key, &value);
    if (ret == HASH_SUCCESS) {
        return EOK;
    } else if (ret == HASH_ERROR_KEY_NOT_FOUND) {
        return ENOENT;
    }

    return EIO;
}

/* ==Group-Cleanup-Process================================================ */

static int cleanup_groups(TALLOC_CTX *memctx,
                          struct sysdb_ctx *sysdb,
                          struct sss_domain_info *domain)
{
    TALLOC_CTX *tmpctx;
    const char *attrs[] = { SYSDB_NAME, NULL };
    time_t now = time(NULL);
    char *subfilter;
    const char *dn;
    struct ldb_message **msgs;
    size_t count;
    struct ldb_message **u_msgs;
    size_t u_count;
    int ret;
    int i;

    tmpctx = talloc_new(memctx);
    if (!tmpctx) {
        return ENOMEM;
    }

    subfilter = talloc_asprintf(tmpctx, "(&(!(%s=0))(%s<=%ld))",
                                SYSDB_CACHE_EXPIRE,
                                SYSDB_CACHE_EXPIRE, (long)now);
    if (!subfilter) {
        DEBUG(2, ("Failed to build filter\n"));
        ret = ENOMEM;
        goto done;
    }

    ret = sysdb_search_groups(tmpctx, sysdb,
                              domain, subfilter, attrs, &count, &msgs);
    if (ret) {
        if (ret == ENOENT) {
            ret = EOK;
        }
        goto done;
    }

    DEBUG(4, ("Found %d expired group entries!\n", count));

    if (count == 0) {
        ret = EOK;
        goto done;
    }

    for (i = 0; i < count; i++) {
        dn = ldb_dn_get_linearized(msgs[i]->dn);
        if (!dn) {
            ret = EFAULT;
            goto done;
        }

        subfilter = talloc_asprintf(tmpctx, "(%s=%s)", SYSDB_MEMBEROF, dn);
        if (!subfilter) {
            DEBUG(2, ("Failed to build filter\n"));
            ret = ENOMEM;
            goto done;
        }

        ret = sysdb_search_users(tmpctx, sysdb,
                                 domain, subfilter, NULL, &u_count, &u_msgs);
        if (ret == ENOENT) {
            const char *name;

            name = ldb_msg_find_attr_as_string(msgs[i], SYSDB_NAME, NULL);
            if (!name) {
                DEBUG(2, ("Entry %s has no Name Attribute ?!?\n",
                          ldb_dn_get_linearized(msgs[i]->dn)));
                ret = EFAULT;
                goto done;
            }

            DEBUG(8, ("About to delete group %s\n", name));
            ret = sysdb_delete_group(tmpctx, sysdb, domain, name, 0);
            if (ret) {
                DEBUG(2, ("Group delete returned %d (%s)\n",
                          ret, strerror(ret)));
                goto done;
            }
        }
        if (ret != EOK) {
            goto done;
        }
        talloc_zfree(u_msgs);
    }

done:
    talloc_zfree(tmpctx);
    return ret;
}