summaryrefslogtreecommitdiff
path: root/src/sss_client/nss_group.c
blob: 7e5f79ad5d17d1065fdbd647ed97331e37e18d80 (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
/*
 * System Security Services Daemon. NSS client interface
 *
 * Copyright (C) Simo Sorce 2007
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as
 * published by the Free Software Foundation; either version 2.1 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 Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this program; if not, write to the Free Software
 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 */

/* GROUP database NSS interface */

#include <nss.h>
#include <errno.h>
#include <sys/types.h>
#include <unistd.h>
#include <stdlib.h>
#include <stdint.h>
#include <string.h>
#include "sss_cli.h"

static struct sss_nss_getgrent_data {
    size_t len;
    size_t ptr;
    uint8_t *data;
} sss_nss_getgrent_data;

static void sss_nss_getgrent_data_clean(void) {

    if (sss_nss_getgrent_data.data != NULL) {
        free(sss_nss_getgrent_data.data);
        sss_nss_getgrent_data.data = NULL;
    }
    sss_nss_getgrent_data.len = 0;
    sss_nss_getgrent_data.ptr = 0;
}

/* GETGRNAM Request:
 *
 * 0-X: string with name
 *
 * GERTGRGID Request:
 *
 * 0-7: 32bit number with gid
 *
 * INITGROUPS Request:
 *
 * 0-3: 32bit number with gid
 * 4-7: 32bit unsigned with max num of entries
 *
 * Replies:
 *
 * 0-3: 32bit unsigned number of results
 * 4-7: 32bit unsigned (reserved/padding)
 *  For each result (64bit padded ?):
 *  0-3: 32bit number gid
 *  4-7: 32bit unsigned number of members
 *  8-X: sequence of 0 terminated strings (name, passwd, mem..)
 *
 *  FIXME: do we need to pad so that each result is 32 bit aligned ?
 */
struct sss_nss_gr_rep {
    struct group *result;
    char *buffer;
    size_t buflen;
};

static int sss_nss_getgr_readrep(struct sss_nss_gr_rep *pr,
                                 uint8_t *buf, size_t *len)
{
    errno_t ret;
    size_t i, l, slen, ptmem, pad, dlen, glen;
    char *sbuf;
    uint32_t mem_num;
    uint32_t c;

    if (*len < 11) { /* not enough space for data, bad packet */
        return EBADMSG;
    }

    SAFEALIGN_COPY_UINT32(&c, buf, NULL);
    pr->result->gr_gid = c;
    SAFEALIGN_COPY_UINT32(&mem_num, buf+sizeof(uint32_t), NULL);

    sbuf = (char *)&buf[8];
    slen = *len - 8;
    dlen = pr->buflen;

    pr->result->gr_name = &(pr->buffer[0]);
    i = 0;

    ret = sss_readrep_copy_string(sbuf, &i,
                                  &slen, &dlen,
                                  &pr->result->gr_name,
                                  NULL);
    if (ret != EOK) return ret;

    pr->result->gr_passwd = &(pr->buffer[i]);
    ret = sss_readrep_copy_string(sbuf, &i,
                                  &slen, &dlen,
                                  &pr->result->gr_passwd,
                                  NULL);
    if (ret != EOK) return ret;

    /* Make sure pr->buffer[i+pad] is 32 bit aligned */
    pad = 0;
    while((i + pad) % 4) {
        pad++;
    }

    /* now members */
    pr->result->gr_mem = (char **)&(pr->buffer[i+pad]);
    ptmem = (sizeof(char *) * (mem_num + 1)) + pad;
    if (ptmem > dlen) {
        return ERANGE; /* not ENOMEM, ERANGE is what glibc looks for */
    }
    dlen -= ptmem;
    ptmem += i;
    pr->result->gr_mem[mem_num] = NULL; /* terminate array */

    for (l = 0; l < mem_num; l++) {
        pr->result->gr_mem[l] = &(pr->buffer[ptmem]);
        ret = sss_readrep_copy_string(sbuf, &i,
                                      &slen, &dlen,
                                      &pr->result->gr_mem[l],
                                      &glen);
        if (ret != EOK) return ret;

        ptmem += glen + 1;
    }

    *len = slen -i;
    return 0;
}

/* INITGROUP Reply:
 *
 * 0-3: 32bit unsigned number of results
 * 4-7: 32bit unsigned (reserved/padding)
 * For each result:
 *  0-4: 32bit number with gid
 */


enum nss_status _nss_sss_initgroups_dyn(const char *user, gid_t group,
                                        long int *start, long int *size,
                                        gid_t **groups, long int limit,
                                        int *errnop)
{
    struct sss_cli_req_data rd;
    uint8_t *repbuf;
    size_t replen;
    enum nss_status nret;
    uint32_t *rbuf;
    uint32_t num_ret;
    long int l, max_ret;

    rd.len = strlen(user) +1;
    rd.data = user;

    sss_nss_lock();

    nret = sss_nss_make_request(SSS_NSS_INITGR, &rd,
                                &repbuf, &replen, errnop);
    if (nret != NSS_STATUS_SUCCESS) {
        goto out;
    }

    /* no results if not found */
    num_ret = ((uint32_t *)repbuf)[0];
    if (num_ret == 0) {
        free(repbuf);
        nret = NSS_STATUS_NOTFOUND;
        goto out;
    }
    max_ret = num_ret;

    /* check we have enough space in the buffer */
    if ((*size - *start) < num_ret) {
        long int newsize;
        gid_t *newgroups;

        newsize = *size + num_ret;
        if ((limit > 0) && (newsize > limit)) {
            newsize = limit;
            max_ret = newsize - *start;
        }

        newgroups = (gid_t *)realloc((*groups), newsize * sizeof(**groups));
        if (!newgroups) {
            *errnop = ENOMEM;
            free(repbuf);
            nret = NSS_STATUS_TRYAGAIN;
            goto out;
        }
        *groups = newgroups;
        *size = newsize;
    }

    rbuf = &((uint32_t *)repbuf)[2];
    for (l = 0; l < max_ret; l++) {
        (*groups)[*start] = rbuf[l];
        *start += 1;
    }

    free(repbuf);
    nret = NSS_STATUS_SUCCESS;

out:
    sss_nss_unlock();
    return nret;
}


enum nss_status _nss_sss_getgrnam_r(const char *name, struct group *result,
                                    char *buffer, size_t buflen, int *errnop)
{
    struct sss_cli_req_data rd;
    struct sss_nss_gr_rep grrep;
    uint8_t *repbuf;
    size_t replen, len, name_len;
    enum nss_status nret;
    int ret;

    /* Caught once glibc passing in buffer == 0x0 */
    if (!buffer || !buflen) {
        *errnop = ERANGE;
        return NSS_STATUS_TRYAGAIN;
    }

    ret = sss_strnlen(name, SSS_NAME_MAX, &name_len);
    if (ret != 0) {
        *errnop = EINVAL;
        return NSS_STATUS_NOTFOUND;
    }

    rd.len = name_len + 1;
    rd.data = name;

    sss_nss_lock();

    nret = sss_nss_make_request(SSS_NSS_GETGRNAM, &rd,
                                &repbuf, &replen, errnop);
    if (nret != NSS_STATUS_SUCCESS) {
        goto out;
    }

    grrep.result = result;
    grrep.buffer = buffer;
    grrep.buflen = buflen;

    /* no results if not found */
    if (((uint32_t *)repbuf)[0] == 0) {
        free(repbuf);
        nret = NSS_STATUS_NOTFOUND;
        goto out;
    }

    /* only 1 result is accepted for this function */
    if (((uint32_t *)repbuf)[0] != 1) {
        *errnop = EBADMSG;
        free(repbuf);
        nret = NSS_STATUS_TRYAGAIN;
        goto out;
    }

    len = replen - 8;
    ret = sss_nss_getgr_readrep(&grrep, repbuf+8, &len);
    free(repbuf);
    if (ret) {
        *errnop = ret;
        nret = NSS_STATUS_TRYAGAIN;
        goto out;
    }

    nret = NSS_STATUS_SUCCESS;

out:
    sss_nss_unlock();
    return nret;
}

enum nss_status _nss_sss_getgrgid_r(gid_t gid, struct group *result,
                                    char *buffer, size_t buflen, int *errnop)
{
    struct sss_cli_req_data rd;
    struct sss_nss_gr_rep grrep;
    uint8_t *repbuf;
    size_t replen, len;
    enum nss_status nret;
    uint32_t group_gid;
    int ret;

    /* Caught once glibc passing in buffer == 0x0 */
    if (!buffer || !buflen) return ERANGE;

    group_gid = gid;
    rd.len = sizeof(uint32_t);
    rd.data = &group_gid;

    sss_nss_lock();

    nret = sss_nss_make_request(SSS_NSS_GETGRGID, &rd,
                                &repbuf, &replen, errnop);
    if (nret != NSS_STATUS_SUCCESS) {
        goto out;
    }

    grrep.result = result;
    grrep.buffer = buffer;
    grrep.buflen = buflen;

    /* no results if not found */
    if (((uint32_t *)repbuf)[0] == 0) {
        free(repbuf);
        nret = NSS_STATUS_NOTFOUND;
        goto out;
    }

    /* only 1 result is accepted for this function */
    if (((uint32_t *)repbuf)[0] != 1) {
        *errnop = EBADMSG;
        free(repbuf);
        nret = NSS_STATUS_TRYAGAIN;
        goto out;
    }

    len = replen - 8;
    ret = sss_nss_getgr_readrep(&grrep, repbuf+8, &len);
    free(repbuf);
    if (ret) {
        *errnop = ret;
        nret = NSS_STATUS_TRYAGAIN;
        goto out;
    }

    nret = NSS_STATUS_SUCCESS;

out:
    sss_nss_unlock();
    return nret;
}

enum nss_status _nss_sss_setgrent(void)
{
    enum nss_status nret;
    int errnop;

    sss_nss_lock();

    /* make sure we do not have leftovers, and release memory */
    sss_nss_getgrent_data_clean();

    nret = sss_nss_make_request(SSS_NSS_SETGRENT,
                                NULL, NULL, NULL, &errnop);
    if (nret != NSS_STATUS_SUCCESS) {
        errno = errnop;
    }

    sss_nss_unlock();
    return nret;
}

static enum nss_status internal_getgrent_r(struct group *result,
                                           char *buffer, size_t buflen,
                                           int *errnop)
{
    struct sss_cli_req_data rd;
    struct sss_nss_gr_rep grrep;
    uint8_t *repbuf;
    size_t replen;
    enum nss_status nret;
    uint32_t num_entries;
    int ret;

    /* Caught once glibc passing in buffer == 0x0 */
    if (!buffer || !buflen) return ERANGE;

    /* if there are leftovers return the next one */
    if (sss_nss_getgrent_data.data != NULL &&
        sss_nss_getgrent_data.ptr < sss_nss_getgrent_data.len) {

        repbuf = (uint8_t *)sss_nss_getgrent_data.data +
                    sss_nss_getgrent_data.ptr;
        replen = sss_nss_getgrent_data.len -
                    sss_nss_getgrent_data.ptr;

        grrep.result = result;
        grrep.buffer = buffer;
        grrep.buflen = buflen;

        ret = sss_nss_getgr_readrep(&grrep, repbuf, &replen);
        if (ret) {
            *errnop = ret;
            return NSS_STATUS_TRYAGAIN;
        }

        /* advance buffer pointer */
        sss_nss_getgrent_data.ptr = sss_nss_getgrent_data.len - replen;

        return NSS_STATUS_SUCCESS;
    }

    /* release memory if any */
    sss_nss_getgrent_data_clean();

    /* retrieve no more than SSS_NSS_MAX_ENTRIES at a time */
    num_entries = SSS_NSS_MAX_ENTRIES;
    rd.len = sizeof(uint32_t);
    rd.data = &num_entries;

    nret = sss_nss_make_request(SSS_NSS_GETGRENT, &rd,
                                &repbuf, &replen, errnop);
    if (nret != NSS_STATUS_SUCCESS) {
        return nret;
    }

    /* no results if not found */
    if ((((uint32_t *)repbuf)[0] == 0) || (replen - 8 == 0)) {
        free(repbuf);
        return NSS_STATUS_NOTFOUND;
    }

    sss_nss_getgrent_data.data = repbuf;
    sss_nss_getgrent_data.len = replen;
    sss_nss_getgrent_data.ptr = 8; /* skip metadata fields */

    /* call again ourselves, this will return the first result */
    return internal_getgrent_r(result, buffer, buflen, errnop);
}

enum nss_status _nss_sss_getgrent_r(struct group *result,
                                    char *buffer, size_t buflen, int *errnop)
{
    enum nss_status nret;

    sss_nss_lock();
    nret = internal_getgrent_r(result, buffer, buflen, errnop);
    sss_nss_unlock();

    return nret;
}

enum nss_status _nss_sss_endgrent(void)
{
    enum nss_status nret;
    int errnop;

    sss_nss_lock();

    /* make sure we do not have leftovers, and release memory */
    sss_nss_getgrent_data_clean();

    nret = sss_nss_make_request(SSS_NSS_ENDGRENT,
                                NULL, NULL, NULL, &errnop);
    if (nret != NSS_STATUS_SUCCESS) {
        errno = errnop;
    }

    sss_nss_unlock();
    return nret;
}