summaryrefslogtreecommitdiffstats
path: root/src/sss_client/nss_netgroup.c
blob: 8594fc460514d6f92e786605168fa7d15c7ee913 (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
/*
    SSSD

    nss_netgroup.c

    Authors:
        Stephen Gallagher <sgallagh@redhat.com>

    Copyright (C) 2010 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 <nss.h>
#include <errno.h>
#include <sys/types.h>
#include <unistd.h>
#include <stdlib.h>
#include <stdint.h>
#include <stdio.h>
#include <string.h>
#include "sss_cli.h"
#include "nss_compat.h"

#define CLEAR_NETGRENT_DATA(netgrent) do { \
        free(netgrent->data); \
        netgrent->data = NULL; \
        netgrent->idx.position = 0; \
        netgrent->data_size = 0; \
} while (0);

/*
 * Replies:
 *
 * 0-3: 32bit unsigned number of results N
 * 4-7: 32bit unsigned (reserved/padding)
 *  For each result:
 *  8-11: 32bit unsigned type of result
 *  12-X: \0 terminated string representing a tuple
 *        (host, user, domain)
 *        or a netgroup, depending on the type indicator
 *  ... repeated N times
 */
#define NETGR_METADATA_COUNT 2 * sizeof(uint32_t)
struct sss_nss_netgr_rep {
    struct __netgrent *result;
    char *buffer;
    size_t buflen;
};

static int sss_nss_getnetgr_readrep(struct sss_nss_netgr_rep *pr,
                                    uint8_t *buf, size_t *len)
{
    errno_t ret;
    char *sbuf;
    char *temp;
    size_t i, slen, dlen, size;
    uint32_t type;

    if (*len < 6) {
        /* Not enough space for data, bad packet */
        return EBADMSG;
    }

    sbuf = (char *)(buf + sizeof(uint32_t));
    slen = *len - sizeof(uint32_t);
    dlen = pr->buflen;

    i = 0;

    SAFEALIGN_COPY_UINT32(&type, buf, NULL);
    switch (type) {
        case SSS_NETGR_REP_TRIPLE:
            pr->result->type = triple_val;

            /* Host value */
            temp = &(pr->buffer[i]);
            ret = sss_readrep_copy_string(sbuf, &i,
                                          &slen, &dlen,
                                          &temp,
                                          &size);
            if (ret != EOK) return ret;

            /* libc expects NULL instead of empty string */
            if (size == 0) {
                pr->result->val.triple.host = NULL;
            } else {
                pr->result->val.triple.host = temp;
            }

            /* User value */
            temp = &(pr->buffer[i]);
            ret = sss_readrep_copy_string(sbuf, &i,
                                          &slen, &dlen,
                                          &temp,
                                          &size);
            if (ret != EOK) return ret;

            /* libc expects NULL instead of empty string */
            if (size == 0) {
                pr->result->val.triple.user = NULL;
            } else {
                pr->result->val.triple.user = temp;
            }

            /* Domain value */
            temp = &(pr->buffer[i]);
            ret = sss_readrep_copy_string(sbuf, &i,
                                          &slen, &dlen,
                                          &temp,
                                          &size);
            if (ret != EOK) return ret;

            /* libc expects NULL instead of empty string */
            if (size == 0) {
                pr->result->val.triple.domain = NULL;
            } else {
                pr->result->val.triple.domain = temp;
            }

            break;

        case SSS_NETGR_REP_GROUP:
            pr->result->type = group_val;

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

            pr->result->val.group = temp;

            break;

        default:
            return EBADMSG;
    }


    *len = slen -i;

    return 0;
}

enum nss_status _nss_sss_setnetgrent(const char *netgroup,
                     struct __netgrent *result)
{
    uint8_t *repbuf = NULL;
    size_t replen;
    uint32_t num_results;
    enum nss_status nret;
    struct sss_cli_req_data rd;
    int errnop;
    char *name;
    size_t name_len;
    errno_t ret;

    if (!netgroup) return NSS_STATUS_NOTFOUND;

    sss_nss_lock();

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

    ret = sss_strnlen(netgroup, SSS_NAME_MAX, &name_len);
    if (ret != 0) {
        nret = NSS_STATUS_NOTFOUND;
        goto out;
    }

    name = malloc(sizeof(char)*name_len + 1);
    if (name == NULL) {
        nret = NSS_STATUS_TRYAGAIN;
        goto out;
    }
    strncpy(name, netgroup, name_len + 1);

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

    nret = sss_nss_make_request(SSS_NSS_SETNETGRENT, &rd,
                                &repbuf, &replen, &errnop);
    free(name);
    if (nret != NSS_STATUS_SUCCESS) {
        errno = errnop;
        goto out;
    }

    /* Get number of results from repbuf */
    SAFEALIGN_COPY_UINT32(&num_results, repbuf, NULL);

    /* no results if not found */
    if ((num_results == 0) || (replen < NETGR_METADATA_COUNT)) {
        free(repbuf);
        nret = NSS_STATUS_NOTFOUND;
        goto out;
    }

    free(repbuf);
    nret = NSS_STATUS_SUCCESS;

out:
    sss_nss_unlock();
    return nret;
}

static enum nss_status internal_getnetgrent_r(struct __netgrent *result,
                                              char *buffer, size_t buflen,
                                              int *errnop)
{
    struct sss_cli_req_data rd;
    struct sss_nss_netgr_rep netgrrep;
    uint8_t *repbuf;
    size_t replen;
    uint32_t num_results;
    enum nss_status nret;
    uint32_t num_entries;
    int ret;

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

    /* If we're already processing result data, continue to
     * return it.
     */
    if (result->data != NULL &&
        result->idx.position < result->data_size) {

        repbuf = (uint8_t *) result->data + result->idx.position;
        replen = result->data_size - result->idx.position;

        netgrrep.result = result;
        netgrrep.buffer = buffer;
        netgrrep.buflen = buflen;

        ret = sss_nss_getnetgr_readrep(&netgrrep, repbuf, &replen);
        if (ret != 0) {
            *errnop = ret;
            return NSS_STATUS_TRYAGAIN;
        }

        result->idx.position = result->data_size - replen;

        return NSS_STATUS_SUCCESS;
    }

    /* Release memory, if any */
    CLEAR_NETGRENT_DATA(result);

    /* 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_GETNETGRENT, &rd,
                                &repbuf, &replen, errnop);
    if (nret != NSS_STATUS_SUCCESS) {
        return nret;
    }

    /* Get number of results from repbuf. */
    SAFEALIGN_COPY_UINT32(&num_results, repbuf, NULL);

    /* no results if not found */
    if ((num_results == 0) || (replen <= NETGR_METADATA_COUNT)) {
        free(repbuf);
        return NSS_STATUS_RETURN;
    }

    result->data = (char *) repbuf;
    result->data_size = replen;
    /* skip metadata fields */
    result->idx.position = NETGR_METADATA_COUNT;

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

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

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

    return nret;
}

enum nss_status _nss_sss_endnetgrent(struct __netgrent *result)
{
    enum nss_status nret;
    int errnop;

    sss_nss_lock();

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

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

    sss_nss_unlock();
    return nret;
}