1 /* Copyright (c) 1997-2023 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
3
4 The GNU C Library is free software; you can redistribute it and/or
5 modify it under the terms of the GNU Lesser General Public
6 License as published by the Free Software Foundation; either
7 version 2.1 of the License, or (at your option) any later version.
8
9 The GNU C Library is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 Lesser General Public License for more details.
13
14 You should have received a copy of the GNU Lesser General Public
15 License along with the GNU C Library; if not, see
16 <https://www.gnu.org/licenses/>. */
17
18 #include <assert.h>
19 #include <stdio.h>
20 #include <stdlib.h>
21 #include <string.h>
22 #include <stdint.h>
23 #include <sys/types.h>
24 #include <rpc/rpc.h>
25 #include <rpcsvc/nis.h>
26 #include <shlib-compat.h>
27
28 #define DEFAULT_TTL 43200
29
30 /*
31 ** Some functions for parsing the -D param and NIS_DEFAULTS Environ
32 */
33 static nis_name
34 searchXYX (char *str, const char *what)
35 {
36 assert (strlen (what) == 6);
37 assert (strncmp (str, what, 6) == 0);
38 str += 6; /* Points to the begin of the parameters. */
39
40 int i = 0;
41 while (str[i] != '\0' && str[i] != ':')
42 ++i;
43 if (i == 0) /* only "<WHAT>=" ? */
44 return strdup ("");
45
46 return strndup (str, i);
47 }
48
49
50 static nis_name
51 searchgroup (char *str)
52 {
53 return searchXYX (str, "group=");
54 }
55
56
57 static nis_name
58 searchowner (char *str)
59 {
60 return searchXYX (str, "owner=");
61 }
62
63
64 static uint32_t
65 searchttl (char *str)
66 {
67 char buf[strlen (str) + 1];
68 char *cptr, *dptr;
69 uint32_t time;
70 int i;
71
72 dptr = strstr (str, "ttl=");
73 if (dptr == NULL) /* should (could) not happen */
74 return DEFAULT_TTL;;
75
76 dptr += 4; /* points to the begin of the new ttl */
77 i = 0;
78 while (dptr[i] != '\0' && dptr[i] != ':')
79 i++;
80 if (i == 0) /* only "ttl=" ? */
81 return DEFAULT_TTL;
82
83 strncpy (buf, dptr, i);
84 buf[i] = '\0';
85 time = 0;
86
87 dptr = buf;
88 cptr = strchr (dptr, 'd');
89 if (cptr != NULL)
90 {
91 *cptr = '\0';
92 cptr++;
93 time += atoi (dptr) * 60 * 60 * 24;
94 dptr = cptr;
95 }
96
97 cptr = strchr (dptr, 'h');
98 if (cptr != NULL)
99 {
100 *cptr = '\0';
101 cptr++;
102 time += atoi (dptr) * 60 * 60;
103 dptr = cptr;
104 }
105
106 cptr = strchr (dptr, 'm');
107 if (cptr != NULL)
108 {
109 *cptr = '\0';
110 cptr++;
111 time += atoi (dptr) * 60;
112 dptr = cptr;
113 }
114
115 cptr = strchr (dptr, 's');
116 if (cptr != NULL)
117 *cptr = '\0';
118
119 time += atoi (dptr);
120
121 return time;
122 }
123
124 static unsigned int
125 searchaccess (char *str, unsigned int access)
126 {
127 char buf[strlen (str) + 1];
128 char *cptr;
129 unsigned int result = access;
130 int i;
131 int n, o, g, w;
132
133 cptr = strstr (str, "access=");
134 if (cptr == NULL)
135 return 0;
136
137 cptr += 7; /* points to the begin of the access string */
138 i = 0;
139 while (cptr[i] != '\0' && cptr[i] != ':')
140 i++;
141 if (i == 0) /* only "access=" ? */
142 return 0;
143
144 strncpy (buf, cptr, i);
145 buf[i] = '\0';
146
147 n = o = g = w = 0;
148 cptr = buf;
149 if (*cptr == ',') /* Fix for stupid Solaris scripts */
150 ++cptr;
151 while (*cptr != '\0')
152 {
153 switch (*cptr)
154 {
155 case 'n':
156 n = 1;
157 break;
158 case 'o':
159 o = 1;
160 break;
161 case 'g':
162 g = 1;
163 break;
164 case 'w':
165 w = 1;
166 break;
167 case 'a':
168 o = g = w = 1;
169 break;
170 case '-':
171 cptr++; /* Remove "-" from beginning */
172 while (*cptr != '\0' && *cptr != ',')
173 {
174 switch (*cptr)
175 {
176 case 'r':
177 if (n)
178 result = result & ~(NIS_READ_ACC << 24);
179 if (o)
180 result = result & ~(NIS_READ_ACC << 16);
181 if (g)
182 result = result & ~(NIS_READ_ACC << 8);
183 if (w)
184 result = result & ~(NIS_READ_ACC);
185 break;
186 case 'm':
187 if (n)
188 result = result & ~(NIS_MODIFY_ACC << 24);
189 if (o)
190 result = result & ~(NIS_MODIFY_ACC << 16);
191 if (g)
192 result = result & ~(NIS_MODIFY_ACC << 8);
193 if (w)
194 result = result & ~(NIS_MODIFY_ACC);
195 break;
196 case 'c':
197 if (n)
198 result = result & ~(NIS_CREATE_ACC << 24);
199 if (o)
200 result = result & ~(NIS_CREATE_ACC << 16);
201 if (g)
202 result = result & ~(NIS_CREATE_ACC << 8);
203 if (w)
204 result = result & ~(NIS_CREATE_ACC);
205 break;
206 case 'd':
207 if (n)
208 result = result & ~(NIS_DESTROY_ACC << 24);
209 if (o)
210 result = result & ~(NIS_DESTROY_ACC << 16);
211 if (g)
212 result = result & ~(NIS_DESTROY_ACC << 8);
213 if (w)
214 result = result & ~(NIS_DESTROY_ACC);
215 break;
216 default:
217 return (~0U);
218 }
219 cptr++;
220 }
221 n = o = g = w = 0;
222 break;
223 case '+':
224 cptr++; /* Remove "+" from beginning */
225 while (*cptr != '\0' && *cptr != ',')
226 {
227 switch (*cptr)
228 {
229 case 'r':
230 if (n)
231 result = result | (NIS_READ_ACC << 24);
232 if (o)
233 result = result | (NIS_READ_ACC << 16);
234 if (g)
235 result = result | (NIS_READ_ACC << 8);
236 if (w)
237 result = result | (NIS_READ_ACC);
238 break;
239 case 'm':
240 if (n)
241 result = result | (NIS_MODIFY_ACC << 24);
242 if (o)
243 result = result | (NIS_MODIFY_ACC << 16);
244 if (g)
245 result = result | (NIS_MODIFY_ACC << 8);
246 if (w)
247 result = result | (NIS_MODIFY_ACC);
248 break;
249 case 'c':
250 if (n)
251 result = result | (NIS_CREATE_ACC << 24);
252 if (o)
253 result = result | (NIS_CREATE_ACC << 16);
254 if (g)
255 result = result | (NIS_CREATE_ACC << 8);
256 if (w)
257 result = result | (NIS_CREATE_ACC);
258 break;
259 case 'd':
260 if (n)
261 result = result | (NIS_DESTROY_ACC << 24);
262 if (o)
263 result = result | (NIS_DESTROY_ACC << 16);
264 if (g)
265 result = result | (NIS_DESTROY_ACC << 8);
266 if (w)
267 result = result | (NIS_DESTROY_ACC);
268 break;
269 default:
270 return (~0U);
271 }
272 cptr++;
273 }
274 n = o = g = w = 0;
275 break;
276 case '=':
277 cptr++; /* Remove "=" from beginning */
278 /* Clear */
279 if (n)
280 result = result & ~((NIS_READ_ACC + NIS_MODIFY_ACC
281 + NIS_CREATE_ACC + NIS_DESTROY_ACC) << 24);
282
283 if (o)
284 result = result & ~((NIS_READ_ACC + NIS_MODIFY_ACC
285 + NIS_CREATE_ACC + NIS_DESTROY_ACC) << 16);
286 if (g)
287 result = result & ~((NIS_READ_ACC + NIS_MODIFY_ACC
288 + NIS_CREATE_ACC + NIS_DESTROY_ACC) << 8);
289 if (w)
290 result = result & ~(NIS_READ_ACC + NIS_MODIFY_ACC
291 + NIS_CREATE_ACC + NIS_DESTROY_ACC);
292 while (*cptr != '\0' && *cptr != ',')
293 {
294 switch (*cptr)
295 {
296 case 'r':
297 if (n)
298 result = result | (NIS_READ_ACC << 24);
299 if (o)
300 result = result | (NIS_READ_ACC << 16);
301 if (g)
302 result = result | (NIS_READ_ACC << 8);
303 if (w)
304 result = result | (NIS_READ_ACC);
305 break;
306 case 'm':
307 if (n)
308 result = result | (NIS_MODIFY_ACC << 24);
309 if (o)
310 result = result | (NIS_MODIFY_ACC << 16);
311 if (g)
312 result = result | (NIS_MODIFY_ACC << 8);
313 if (w)
314 result = result | (NIS_MODIFY_ACC);
315 break;
316 case 'c':
317 if (n)
318 result = result | (NIS_CREATE_ACC << 24);
319 if (o)
320 result = result | (NIS_CREATE_ACC << 16);
321 if (g)
322 result = result | (NIS_CREATE_ACC << 8);
323 if (w)
324 result = result | (NIS_CREATE_ACC);
325 break;
326 case 'd':
327 if (n)
328 result = result | (NIS_DESTROY_ACC << 24);
329 if (o)
330 result = result | (NIS_DESTROY_ACC << 16);
331 if (g)
332 result = result | (NIS_DESTROY_ACC << 8);
333 if (w)
334 result = result | (NIS_DESTROY_ACC);
335 break;
336 default:
337 return result = (~0U);
338 }
339 cptr++;
340 }
341 n = o = g = w = 0;
342 break;
343 default:
344 return result = (~0U);
345 }
346 if (*cptr != '\0')
347 cptr++;
348 }
349
350 return result;
351 }
352
353
354 nis_name
355 __nis_default_owner (char *defaults)
356 {
357 char *default_owner = NULL;
358
359 char *cptr = defaults;
360 if (cptr == NULL)
361 cptr = getenv ("NIS_DEFAULTS");
362
363 if (cptr != NULL)
364 {
365 char *dptr = strstr (cptr, "owner=");
366 if (dptr != NULL)
367 {
368 char *p = searchowner (dptr);
369 if (p == NULL)
370 return NULL;
371 default_owner = strdupa (p);
372 free (p);
373 }
374 }
375
376 return strdup (default_owner ?: nis_local_principal ());
377 }
378 libnsl_hidden_nolink_def (__nis_default_owner, GLIBC_2_1)
379
380
381 nis_name
382 __nis_default_group (char *defaults)
383 {
384 char *default_group = NULL;
385
386 char *cptr = defaults;
387 if (cptr == NULL)
388 cptr = getenv ("NIS_DEFAULTS");
389
390 if (cptr != NULL)
391 {
392 char *dptr = strstr (cptr, "group=");
393 if (dptr != NULL)
394 {
395 char *p = searchgroup (dptr);
396 if (p == NULL)
397 return NULL;
398 default_group = strdupa (p);
399 free (p);
400 }
401 }
402
403 return strdup (default_group ?: nis_local_group ());
404 }
405 libnsl_hidden_nolink_def (__nis_default_group, GLIBC_2_1)
406
407
408 uint32_t
409 __nis_default_ttl (char *defaults)
410 {
411 char *cptr, *dptr;
412
413 if (defaults != NULL)
414 {
415 dptr = strstr (defaults, "ttl=");
416 if (dptr != NULL)
417 return searchttl (defaults);
418 }
419
420 cptr = getenv ("NIS_DEFAULTS");
421 if (cptr == NULL)
422 return DEFAULT_TTL;
423
424 dptr = strstr (cptr, "ttl=");
425 if (dptr == NULL)
426 return DEFAULT_TTL;
427
428 return searchttl (cptr);
429 }
430 libnsl_hidden_nolink_def (__nis_default_ttl, GLIBC_2_1)
431
432 /* Default access rights are ----rmcdr---r---, but we could change
433 this with the NIS_DEFAULTS variable. */
434 unsigned int
435 __nis_default_access (char *param, unsigned int defaults)
436 {
437 unsigned int result;
438 char *cptr;
439
440 if (defaults == 0)
441 result = 0 | OWNER_DEFAULT | GROUP_DEFAULT | WORLD_DEFAULT;
442 else
443 result = defaults;
444
445 if (param != NULL && strstr (param, "access=") != NULL)
446 result = searchaccess (param, result);
447 else
448 {
449 cptr = getenv ("NIS_DEFAULTS");
450 if (cptr != NULL && strstr (cptr, "access=") != NULL)
451 result = searchaccess (cptr, result);
452 }
453
454 return result;
455 }
456 libnsl_hidden_nolink_def (__nis_default_access, GLIBC_2_1)