1/* Copyright (C) 1997-2016 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
3 Contributed by Thorsten Kukuk <kukuk@vt.uni-paderborn.de>, 1997.
4
5 The GNU C Library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Lesser General Public
7 License as published by the Free Software Foundation; either
8 version 2.1 of the License, or (at your option) any later version.
9
10 The GNU C Library is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 Lesser General Public License for more details.
14
15 You should have received a copy of the GNU Lesser General Public
16 License along with the GNU C Library; if not, see
17 <http://www.gnu.org/licenses/>. */
18
19#include <atomic.h>
20#include <nss.h>
21#include <errno.h>
22#include <pwd.h>
23#include <string.h>
24#include <libc-lock.h>
25#include <rpcsvc/nis.h>
26
27#include "nss-nisplus.h"
28#include "nisplus-parser.h"
29#include <libnsl.h>
30#include <nis_intern.h>
31#include <nis_xdr.h>
32
33
34__libc_lock_define_initialized (static, lock)
35
36/* Connection information. */
37static ib_request *ibreq;
38static directory_obj *dir;
39static dir_binding bptr;
40static char *tablepath;
41static char *tableptr;
42/* Cursor. */
43static netobj cursor;
44
45
46nis_name pwd_tablename_val attribute_hidden;
47size_t pwd_tablename_len attribute_hidden;
48
49enum nss_status
50_nss_pwd_create_tablename (int *errnop)
51{
52 if (pwd_tablename_val == NULL)
53 {
54 const char *local_dir = nis_local_directory ();
55 size_t local_dir_len = strlen (local_dir);
56 static const char prefix[] = "passwd.org_dir.";
57
58 char *p = malloc (sizeof (prefix) + local_dir_len);
59 if (p == NULL)
60 {
61 *errnop = errno;
62 return NSS_STATUS_TRYAGAIN;
63 }
64
65 memcpy (__stpcpy (p, prefix), local_dir, local_dir_len + 1);
66
67 pwd_tablename_len = sizeof (prefix) - 1 + local_dir_len;
68
69 atomic_write_barrier ();
70
71 if (atomic_compare_and_exchange_bool_acq (&pwd_tablename_val, p, NULL))
72 {
73 /* Another thread already installed the value. */
74 free (p);
75 pwd_tablename_len = strlen (pwd_tablename_val);
76 }
77 }
78
79 return NSS_STATUS_SUCCESS;
80}
81
82
83static void
84internal_nisplus_endpwent (void)
85{
86 __nisbind_destroy (&bptr);
87 memset (&bptr, '\0', sizeof (bptr));
88
89 nis_free_directory (dir);
90 dir = NULL;
91
92 nis_free_request (ibreq);
93 ibreq = NULL;
94
95 xdr_free ((xdrproc_t) xdr_netobj, (char *) &cursor);
96 memset (&cursor, '\0', sizeof (cursor));
97
98 free (tablepath);
99 tableptr = tablepath = NULL;
100}
101
102
103static enum nss_status
104internal_nisplus_setpwent (int *errnop)
105{
106 enum nss_status status = NSS_STATUS_SUCCESS;
107
108 if (pwd_tablename_val == NULL)
109 status = _nss_pwd_create_tablename (errnop);
110
111 if (status == NSS_STATUS_SUCCESS)
112 {
113 ibreq = __create_ib_request (pwd_tablename_val, 0);
114 if (ibreq == NULL)
115 {
116 *errnop = errno;
117 return NSS_STATUS_TRYAGAIN;
118 }
119
120 nis_error retcode = __prepare_niscall (pwd_tablename_val, &dir,
121 &bptr, 0);
122 if (retcode != NIS_SUCCESS)
123 {
124 nis_free_request (ibreq);
125 ibreq = NULL;
126 status = niserr2nss (retcode);
127 }
128 }
129
130 return status;
131}
132
133
134enum nss_status
135_nss_nisplus_setpwent (int stayopen)
136{
137 enum nss_status status;
138
139 __libc_lock_lock (lock);
140
141 internal_nisplus_endpwent ();
142
143 // XXX We need to be able to set errno. Pass in new parameter.
144 int err;
145 status = internal_nisplus_setpwent (&err);
146
147 __libc_lock_unlock (lock);
148
149 return status;
150}
151
152
153enum nss_status
154_nss_nisplus_endpwent (void)
155{
156 __libc_lock_lock (lock);
157
158 internal_nisplus_endpwent ();
159
160 __libc_lock_unlock (lock);
161
162 return NSS_STATUS_SUCCESS;
163}
164
165
166static enum nss_status
167internal_nisplus_getpwent_r (struct passwd *pw, char *buffer, size_t buflen,
168 int *errnop)
169{
170 int parse_res = -1;
171 enum nss_status retval = NSS_STATUS_SUCCESS;
172
173 /* Get the next entry until we found a correct one. */
174 do
175 {
176 nis_error status;
177 nis_result result;
178 memset (&result, '\0', sizeof (result));
179
180 if (cursor.n_bytes == NULL)
181 {
182 if (ibreq == NULL)
183 {
184 retval = internal_nisplus_setpwent (errnop);
185 if (retval != NSS_STATUS_SUCCESS)
186 return retval;
187 }
188
189 status = __do_niscall3 (&bptr, NIS_IBFIRST,
190 (xdrproc_t) _xdr_ib_request,
191 (caddr_t) ibreq,
192 (xdrproc_t) _xdr_nis_result,
193 (caddr_t) &result,
194 0, NULL);
195 }
196 else
197 {
198 ibreq->ibr_cookie.n_bytes = cursor.n_bytes;
199 ibreq->ibr_cookie.n_len = cursor.n_len;
200
201 status = __do_niscall3 (&bptr, NIS_IBNEXT,
202 (xdrproc_t) _xdr_ib_request,
203 (caddr_t) ibreq,
204 (xdrproc_t) _xdr_nis_result,
205 (caddr_t) &result,
206 0, NULL);
207
208 ibreq->ibr_cookie.n_bytes = NULL;
209 ibreq->ibr_cookie.n_len = 0;
210 }
211
212 if (status != NIS_SUCCESS)
213 return niserr2nss (status);
214
215 if (NIS_RES_STATUS (&result) == NIS_NOTFOUND)
216 {
217 /* No more entries on this server. This means we have to go
218 to the next server on the path. */
219 status = __follow_path (&tablepath, &tableptr, ibreq, &bptr);
220 if (status != NIS_SUCCESS)
221 return niserr2nss (status);
222
223 directory_obj *newdir = NULL;
224 dir_binding newbptr;
225 status = __prepare_niscall (ibreq->ibr_name, &newdir, &newbptr, 0);
226 if (status != NIS_SUCCESS)
227 return niserr2nss (status);
228
229 nis_free_directory (dir);
230 dir = newdir;
231 __nisbind_destroy (&bptr);
232 bptr = newbptr;
233
234 xdr_free ((xdrproc_t) xdr_netobj, (char *) &result.cookie);
235 result.cookie.n_bytes = NULL;
236 result.cookie.n_len = 0;
237 parse_res = 0;
238 goto next;
239 }
240 else if (NIS_RES_STATUS (&result) != NIS_SUCCESS)
241 return niserr2nss (NIS_RES_STATUS (&result));
242
243 parse_res = _nss_nisplus_parse_pwent (&result, pw, buffer,
244 buflen, errnop);
245
246 if (__glibc_unlikely (parse_res == -1))
247 {
248 *errnop = ERANGE;
249 retval = NSS_STATUS_TRYAGAIN;
250 goto freeres;
251 }
252
253 next:
254 /* Free the old cursor. */
255 xdr_free ((xdrproc_t) xdr_netobj, (char *) &cursor);
256 /* Remember the new one. */
257 cursor.n_bytes = result.cookie.n_bytes;
258 cursor.n_len = result.cookie.n_len;
259 /* Free the result structure. NB: we do not remove the cookie. */
260 result.cookie.n_bytes = NULL;
261 result.cookie.n_len = 0;
262 freeres:
263 xdr_free ((xdrproc_t) _xdr_nis_result, (char *) &result);
264 memset (&result, '\0', sizeof (result));
265 }
266 while (!parse_res);
267
268 return retval;
269}
270
271enum nss_status
272_nss_nisplus_getpwent_r (struct passwd *result, char *buffer, size_t buflen,
273 int *errnop)
274{
275 int status;
276
277 __libc_lock_lock (lock);
278
279 status = internal_nisplus_getpwent_r (result, buffer, buflen, errnop);
280
281 __libc_lock_unlock (lock);
282
283 return status;
284}
285
286enum nss_status
287_nss_nisplus_getpwnam_r (const char *name, struct passwd *pw,
288 char *buffer, size_t buflen, int *errnop)
289{
290 int parse_res;
291
292 if (pwd_tablename_val == NULL)
293 {
294 enum nss_status status = _nss_pwd_create_tablename (errnop);
295
296 if (status != NSS_STATUS_SUCCESS)
297 return status;
298 }
299
300 if (name == NULL)
301 {
302 *errnop = EINVAL;
303 return NSS_STATUS_UNAVAIL;
304 }
305
306 nis_result *result;
307 char buf[strlen (name) + 9 + pwd_tablename_len];
308 int olderr = errno;
309
310 snprintf (buf, sizeof (buf), "[name=%s],%s", name, pwd_tablename_val);
311
312 result = nis_list (buf, FOLLOW_PATH | FOLLOW_LINKS | USE_DGRAM, NULL, NULL);
313
314 if (result == NULL)
315 {
316 *errnop = ENOMEM;
317 return NSS_STATUS_TRYAGAIN;
318 }
319
320 if (__glibc_unlikely (niserr2nss (result->status) != NSS_STATUS_SUCCESS))
321 {
322 enum nss_status status = niserr2nss (result->status);
323
324 __set_errno (olderr);
325
326 nis_freeresult (result);
327 return status;
328 }
329
330 parse_res = _nss_nisplus_parse_pwent (result, pw, buffer, buflen, errnop);
331
332 nis_freeresult (result);
333
334 if (__glibc_unlikely (parse_res < 1))
335 {
336 if (parse_res == -1)
337 {
338 *errnop = ERANGE;
339 return NSS_STATUS_TRYAGAIN;
340 }
341 else
342 {
343 __set_errno (olderr);
344 return NSS_STATUS_NOTFOUND;
345 }
346 }
347
348 return NSS_STATUS_SUCCESS;
349}
350
351enum nss_status
352_nss_nisplus_getpwuid_r (const uid_t uid, struct passwd *pw,
353 char *buffer, size_t buflen, int *errnop)
354{
355 if (pwd_tablename_val == NULL)
356 {
357 enum nss_status status = _nss_pwd_create_tablename (errnop);
358
359 if (status != NSS_STATUS_SUCCESS)
360 return status;
361 }
362
363 int parse_res;
364 nis_result *result;
365 char buf[8 + 3 * sizeof (unsigned long int) + pwd_tablename_len];
366 int olderr = errno;
367
368 snprintf (buf, sizeof (buf), "[uid=%lu],%s",
369 (unsigned long int) uid, pwd_tablename_val);
370
371 result = nis_list (buf, FOLLOW_PATH | FOLLOW_LINKS | USE_DGRAM, NULL, NULL);
372
373 if (result == NULL)
374 {
375 *errnop = ENOMEM;
376 return NSS_STATUS_TRYAGAIN;
377 }
378
379 if (__glibc_unlikely (niserr2nss (result->status) != NSS_STATUS_SUCCESS))
380 {
381 enum nss_status status = niserr2nss (result->status);
382
383 __set_errno (olderr);
384
385 nis_freeresult (result);
386 return status;
387 }
388
389 parse_res = _nss_nisplus_parse_pwent (result, pw, buffer, buflen, errnop);
390
391 nis_freeresult (result);
392
393 if (__glibc_unlikely (parse_res < 1))
394 {
395 if (parse_res == -1)
396 {
397 *errnop = ERANGE;
398 return NSS_STATUS_TRYAGAIN;
399 }
400 else
401 {
402 __set_errno (olderr);
403 return NSS_STATUS_NOTFOUND;
404 }
405 }
406
407 return NSS_STATUS_SUCCESS;
408}
409