summaryrefslogtreecommitdiffstats
path: root/src/db/sysdb_idmap.c
blob: eca3d1bd6ac3eb661d9ffdc5e3b78461fc190668 (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
/*
    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 "db/sysdb.h"
#include "db/sysdb_private.h"

struct ldb_dn *
sysdb_idmap_dn(TALLOC_CTX *mem_ctx, struct sysdb_ctx *sysdb,
               const char *object_sid)
{
    errno_t ret;
    char *clean_sid;
    struct ldb_dn *dn;

    ret = sysdb_dn_sanitize(NULL, object_sid, &clean_sid);
    if (ret != EOK) {
        return NULL;
    }

    DEBUG(SSSDBG_TRACE_ALL,
          (SYSDB_TMPL_IDMAP"\n", clean_sid, sysdb->domain->name));

    dn = ldb_dn_new_fmt(mem_ctx, sysdb->ldb, SYSDB_TMPL_IDMAP,
                        clean_sid, sysdb->domain->name);
    talloc_free(clean_sid);

    return dn;
}

errno_t
sysdb_idmap_store_mapping(struct sysdb_ctx *sysdb,
                          const char *dom_name,
                          const char *dom_sid,
                          id_t slice_num)
{
    errno_t ret, sret;
    int lret;
    bool in_transaction = false;
    TALLOC_CTX *tmp_ctx;
    struct ldb_dn *dn;
    static const char *attrs[] = SYSDB_IDMAP_ATTRS;
    size_t count;
    struct ldb_message *update_msg;
    struct ldb_message **msgs;
    const char *old_name;
    id_t old_slice;

    tmp_ctx = talloc_new(NULL);
    if (!tmp_ctx) return ENOMEM;

    dn = sysdb_idmap_dn(tmp_ctx, sysdb, dom_sid);
    if (!dn) {
        ret = ENOMEM;
        goto done;
    }

    update_msg = ldb_msg_new(tmp_ctx);
    if (!update_msg) {
        ret = ENOMEM;
        goto done;
    }
    update_msg->dn = dn;

    ret = sysdb_transaction_start(sysdb);
    if (ret != EOK) {
        DEBUG(SSSDBG_CRIT_FAILURE, ("Failed to start transaction\n"));
        goto done;
    }

    in_transaction = true;


    /* Check for an existing mapping */
    ret = sysdb_search_entry(tmp_ctx, sysdb, dn, LDB_SCOPE_BASE,
                             NULL, attrs, &count, &msgs);
    if (ret != EOK && ret != ENOENT) goto done;

    if (ret == EOK && count != 1) {
        /* More than one reply for a base search? */
        ret = EIO;
        goto done;
    } else if (ret == ENOENT) {
        /* Create a new mapping */
        DEBUG(SSSDBG_CONF_SETTINGS,
              ("Adding new ID mapping [%s][%s][%lu]\n",
               dom_name, dom_sid, (unsigned long)slice_num));

        /* Add the objectClass */
        lret = ldb_msg_add_empty(update_msg, SYSDB_OBJECTCLASS,
                                 LDB_FLAG_MOD_ADD,
                                 NULL);
        if (lret != LDB_SUCCESS) {
            ret = sysdb_error_to_errno(lret);
            goto done;
        }

        lret = ldb_msg_add_string(update_msg, SYSDB_OBJECTCLASS,
                                  SYSDB_IDMAP_MAPPING_OC);
        if (lret != LDB_SUCCESS) {
            ret = sysdb_error_to_errno(lret);
            goto done;
        }

        /* Add the domain objectSID */
        lret = ldb_msg_add_empty(update_msg, SYSDB_IDMAP_SID_ATTR,
                                 LDB_FLAG_MOD_ADD,
                                 NULL);
        if (lret != LDB_SUCCESS) {
            ret = sysdb_error_to_errno(lret);
            goto done;
        }

        lret = ldb_msg_add_string(update_msg, SYSDB_IDMAP_SID_ATTR, dom_sid);
        if (lret != LDB_SUCCESS) {
            ret = sysdb_error_to_errno(lret);
            goto done;
        }

        /* Add the domain name */
        lret = ldb_msg_add_empty(update_msg, SYSDB_NAME,
                                 LDB_FLAG_MOD_ADD,
                                 NULL);
        if (lret != LDB_SUCCESS) {
            ret = sysdb_error_to_errno(lret);
            goto done;
        }

        lret = ldb_msg_add_string(update_msg, SYSDB_NAME, dom_name);
        if (lret != LDB_SUCCESS) {
            ret = sysdb_error_to_errno(lret);
            goto done;
        }

        /* Add the slice number */
        lret = ldb_msg_add_empty(update_msg, SYSDB_IDMAP_SLICE_ATTR,
                                 LDB_FLAG_MOD_ADD,
                                 NULL);
        if (lret != LDB_SUCCESS) {
            ret = sysdb_error_to_errno(lret);
            goto done;
        }

        lret = ldb_msg_add_fmt(update_msg, SYSDB_IDMAP_SLICE_ATTR,
                               "%lu", (unsigned long)slice_num);
        if (lret != LDB_SUCCESS) {
            ret = sysdb_error_to_errno(lret);
            goto done;
        }

        lret = ldb_add(sysdb->ldb, update_msg);
        if (lret != LDB_SUCCESS) {
            DEBUG(SSSDBG_MINOR_FAILURE,
                  ("Failed to add mapping: [%s]\n",
                   ldb_strerror(lret)));
            ret = sysdb_error_to_errno(lret);
            goto done;
        }
    } else {
        /* Update the existing mapping */

        /* Check whether the slice has changed
         * This should never happen, and it's a recipe for
         * disaster. We'll throw an error if it does.
         */
        old_slice = ldb_msg_find_attr_as_int(msgs[0],
                                             SYSDB_IDMAP_SLICE_ATTR,
                                             -1);
        if (old_slice == -1) {
            DEBUG(SSSDBG_CRIT_FAILURE,
                  ("Could not identify original slice for SID [%s]\n",
                   dom_sid));
            ret = ENOENT;
            goto done;
        }

        if (slice_num != old_slice) {
            DEBUG(SSSDBG_FATAL_FAILURE,
                  ("Detected attempt to change slice value for sid [%s] "
                   "This will break existing users. Refusing to perform.\n"));
            ret = EINVAL;
            goto done;
        }

        /* Check whether the name has changed. This may happen
         * if we're told the real name of a domain and want to
         * replace the SID as placeholder.
         */
        old_name = ldb_msg_find_attr_as_string(msgs[0], SYSDB_NAME, NULL);
        if (!old_name) {
            DEBUG(SSSDBG_CRIT_FAILURE,
                  ("Could not identify original domain name of SID [%s]\n",
                   dom_sid));
            ret = ENOENT;
            goto done;
        }

        if (strcmp(old_name, dom_name) == 0) {
            /* There's nothing to be done. We don't need to
             * make any changes here. Just return success.
             */
            DEBUG(SSSDBG_TRACE_LIBS,
                  ("No changes needed, canceling transaction\n"));
            ret = EOK;
            goto done;
        } else {
            /* The name has changed. Replace it */
            DEBUG(SSSDBG_CONF_SETTINGS,
                  ("Changing domain name of SID [%s] from [%s] to [%s]\n",
                   dom_sid, old_name, dom_name));

            /* Set the new name */
            lret = ldb_msg_add_empty(update_msg, SYSDB_NAME,
                                     LDB_FLAG_MOD_REPLACE,
                                     NULL);
            if (lret != LDB_SUCCESS) {
                ret = sysdb_error_to_errno(lret);
                goto done;
            }

            lret = ldb_msg_add_string(update_msg, SYSDB_NAME, dom_name);
            if (lret != LDB_SUCCESS) {
                ret = sysdb_error_to_errno(lret);
                goto done;
            }
        }

        lret = ldb_modify(sysdb->ldb, update_msg);
        if (lret != LDB_SUCCESS) {
            DEBUG(SSSDBG_MINOR_FAILURE,
                  ("Failed to update mapping: [%s]\n",
                   ldb_strerror(lret)));
            ret = sysdb_error_to_errno(lret);
            goto done;
        }
    }

    ret = sysdb_transaction_commit(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(sysdb);
        if (sret != EOK) {
            DEBUG(SSSDBG_CRIT_FAILURE,
                  ("Could not cancel transaction\n"));
        }
    }
    talloc_free(tmp_ctx);
    return ret;
}

errno_t
sysdb_idmap_get_mappings(TALLOC_CTX *mem_ctx,
                         struct sysdb_ctx *sysdb,
                         struct ldb_result **_result)
{
    errno_t ret;
    int lret;
    struct ldb_dn *base_dn;
    TALLOC_CTX *tmp_ctx;
    struct ldb_result *res;
    static const char *attrs[] = SYSDB_IDMAP_ATTRS;

    tmp_ctx = talloc_new(NULL);
    if (!tmp_ctx) return ENOMEM;

    DEBUG(SSSDBG_TRACE_ALL,
          (SYSDB_TMPL_IDMAP_BASE"\n", sysdb->domain->name));

    base_dn = ldb_dn_new_fmt(tmp_ctx, sysdb->ldb,
                             SYSDB_TMPL_IDMAP_BASE,
                             sysdb->domain->name);
    if (!base_dn) {
        ret = ENOMEM;
        goto done;
    }

    lret = ldb_search(sysdb->ldb, tmp_ctx, &res, base_dn,
                     LDB_SCOPE_SUBTREE, attrs, SYSDB_IDMAP_FILTER);
    if (lret) {
        DEBUG(SSSDBG_MINOR_FAILURE,
              ("Could not locate ID mappings: [%s]\n",
               ldb_strerror(lret)));
        ret = sysdb_error_to_errno(lret);
        goto done;
    }

    *_result = talloc_steal(mem_ctx, res);

    ret = EOK;
done:
    talloc_free(tmp_ctx);
    return ret;
}