c4f2d992 |
1 | /* -*-c-*- |
2 | * |
8bdddfb7 |
3 | * $Id: name.c,v 1.9 2003/10/12 00:39:16 mdw Exp $ |
c4f2d992 |
4 | * |
5 | * Looking up of names in symbol tables |
6 | * |
c758e654 |
7 | * (c) 1998 EBI |
c4f2d992 |
8 | */ |
9 | |
03f996bd |
10 | /*----- Licensing notice --------------------------------------------------* |
c4f2d992 |
11 | * |
12 | * This file is part of `become' |
13 | * |
14 | * `Become' is free software; you can redistribute it and/or modify |
15 | * it under the terms of the GNU General Public License as published by |
16 | * the Free Software Foundation; either version 2 of the License, or |
17 | * (at your option) any later version. |
18 | * |
19 | * `Become' is distributed in the hope that it will be useful, |
20 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
21 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
22 | * GNU General Public License for more details. |
23 | * |
24 | * You should have received a copy of the GNU General Public License |
03f996bd |
25 | * along with `become'; if not, write to the Free Software Foundation, |
26 | * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
c4f2d992 |
27 | */ |
28 | |
29 | /*----- Revision history --------------------------------------------------* |
30 | * |
31 | * $Log: name.c,v $ |
8bdddfb7 |
32 | * Revision 1.9 2003/10/12 00:39:16 mdw |
33 | * Light fixes for strange building. |
34 | * |
f60a3434 |
35 | * Revision 1.8 2003/10/12 00:14:55 mdw |
36 | * Major overhaul. Now uses DSA signatures rather than the bogus symmetric |
37 | * encrypt-and-hope thing. Integrated with mLib and Catacomb. |
38 | * |
8cdc1da9 |
39 | * Revision 1.7 1998/04/23 13:23:56 mdw |
40 | * Fix bugs involving empty classes. |
41 | * |
c758e654 |
42 | * Revision 1.6 1998/01/12 16:46:14 mdw |
43 | * Fix copyright date. |
44 | * |
45 | * Revision 1.5 1997/09/17 10:26:11 mdw |
2e11036b |
46 | * Use rewritten class handler. Support `none' class. |
47 | * |
48 | * Revision 1.4 1997/08/20 16:17:59 mdw |
e6677daf |
49 | * Replace `name_reinit' by `name_end' for more sensible restart. |
50 | * |
607937a4 |
51 | * Revision 1.3 1997/08/07 09:49:39 mdw |
52 | * Extensive modifications to handle netgroups. Also sanitise user and group |
53 | * names before adding them to the symbol table. |
54 | * |
03f996bd |
55 | * Revision 1.2 1997/08/04 10:24:24 mdw |
56 | * Sources placed under CVS control. |
57 | * |
58 | * Revision 1.1 1997/07/21 13:47:46 mdw |
c4f2d992 |
59 | * Initial revision |
60 | * |
61 | */ |
62 | |
63 | /*----- Header files ------------------------------------------------------*/ |
64 | |
65 | /* --- ANSI headers --- */ |
66 | |
607937a4 |
67 | #include <ctype.h> |
c4f2d992 |
68 | #include <stdio.h> |
69 | #include <stdlib.h> |
70 | #include <string.h> |
71 | |
72 | /* --- Unix headers --- */ |
73 | |
607937a4 |
74 | #include <sys/types.h> |
75 | #include <sys/socket.h> |
03f996bd |
76 | |
607937a4 |
77 | #include <netinet/in.h> |
03f996bd |
78 | |
607937a4 |
79 | #include <arpa/inet.h> |
80 | |
81 | #include <netdb.h> |
c4f2d992 |
82 | #include <grp.h> |
83 | #include <pwd.h> |
84 | |
f60a3434 |
85 | /* --- mLib headers --- */ |
86 | |
87 | #include <mLib/alloc.h> |
88 | #include <mLib/sym.h> |
89 | |
c4f2d992 |
90 | /* --- Local headers --- */ |
91 | |
607937a4 |
92 | #include "config.h" |
93 | |
03f996bd |
94 | #include "become.h" |
c4f2d992 |
95 | #include "class.h" |
96 | #include "name.h" |
607937a4 |
97 | #include "netg.h" |
c4f2d992 |
98 | #include "userdb.h" |
c4f2d992 |
99 | |
100 | /*----- Static variables --------------------------------------------------*/ |
101 | |
102 | static sym_table name__table; /* Symbol table for everything */ |
103 | |
104 | /*----- Main code ---------------------------------------------------------*/ |
105 | |
607937a4 |
106 | /* --- @name__get@ --- * |
107 | * |
108 | * Arguments: @const char *p@ = pointer to the name we want |
109 | * @unsigned type@ = type of class it should have |
110 | * |
111 | * Returns: A pointer to a name ready to use, or zero if there's a type |
112 | * conflict. |
113 | * |
114 | * Use: Creates a name of the appropriate type all ready to use. |
115 | */ |
116 | |
117 | static name *name__get(const char *p, unsigned type) |
118 | { |
119 | unsigned f; |
120 | name *n = sym_find(&name__table, p, -1, sizeof(*n), &f); |
2e11036b |
121 | if (!f) |
122 | n->c = 0; |
123 | return ((n->c && !(n->c->type & type)) ? 0 : n); |
607937a4 |
124 | } |
125 | |
126 | /* --- @name__sanitise@ --- * |
127 | * |
128 | * Arguments: @const char *n@ = pointer to a name |
129 | * @char *buf@ = pointer to a buffer of space |
130 | * @size_t sz@ = size of the buffer |
131 | * |
132 | * Returns: A pointer to the transformed name in the buffer, or null |
133 | * if there wasn't enough space. |
134 | * |
135 | * Use: Transforms a name so that it only contains nice characters. |
136 | */ |
137 | |
138 | static char *name__sanitise(const char *n, char *buf, size_t sz) |
139 | { |
140 | char *p = buf; |
141 | |
142 | if (strlen(n) + 1 > sz) |
143 | return (0); |
144 | |
145 | while (*n) { |
146 | if (isalnum((unsigned char)*n)) |
147 | *p++ = *n; |
148 | else |
149 | *p++ = '_'; |
150 | n++; |
151 | } |
152 | *p++ = 0; |
153 | return (buf); |
154 | } |
155 | |
03f996bd |
156 | /* --- @name__users@ --- * |
c4f2d992 |
157 | * |
158 | * Arguments: --- |
159 | * |
160 | * Returns: --- |
161 | * |
03f996bd |
162 | * Use: Adds all of the users registered with the user database to |
163 | * the name table. Also adds the users' primary groups. |
c4f2d992 |
164 | */ |
165 | |
03f996bd |
166 | static void name__users(void) |
c4f2d992 |
167 | { |
03f996bd |
168 | struct passwd *pw; |
169 | struct group *gr; |
607937a4 |
170 | char buf[32]; |
c4f2d992 |
171 | |
03f996bd |
172 | userdb_iterateUsers(); |
173 | while ((pw = userdb_nextUser()) != 0) { |
03f996bd |
174 | name *n; |
2e11036b |
175 | uid_t u = pw->pw_uid; |
607937a4 |
176 | |
03f996bd |
177 | /* --- First, add the user to the table --- */ |
c4f2d992 |
178 | |
607937a4 |
179 | if (name__sanitise(pw->pw_name, buf, sizeof(buf)) && |
180 | (n = name__get(buf, clType_user)) != 0) |
2e11036b |
181 | n->c = class_addUser(n->c, u); |
c4f2d992 |
182 | |
03f996bd |
183 | /* --- Now handle the user's default group --- */ |
c4f2d992 |
184 | |
607937a4 |
185 | if ((gr = userdb_groupById(pw->pw_gid)) != 0 && |
186 | name__sanitise(gr->gr_name, buf, sizeof(buf)) && |
187 | (n = name__get(buf, clType_user)) != 0) |
2e11036b |
188 | n->c = class_addUser(n->c, u); |
03f996bd |
189 | } |
190 | } |
c4f2d992 |
191 | |
03f996bd |
192 | /* --- @name__groups@ --- * |
193 | * |
194 | * Arguments: --- |
195 | * |
196 | * Returns: --- |
197 | * |
198 | * Use: Adds users into all of their supplementary groups. |
199 | */ |
200 | |
201 | static void name__groups(void) |
202 | { |
203 | struct group *gr; |
204 | struct passwd *pw; |
205 | char **p; |
607937a4 |
206 | char buf[32]; |
03f996bd |
207 | |
208 | userdb_iterateGroups(); |
209 | while ((gr = userdb_nextGroup()) != 0) { |
03f996bd |
210 | name *n; |
c4f2d992 |
211 | |
607937a4 |
212 | if (name__sanitise(gr->gr_name, buf, sizeof(buf)) && |
213 | (n = name__get(buf, clType_user)) != 0) { |
03f996bd |
214 | |
607937a4 |
215 | /* --- Now add all of the members --- */ |
216 | |
217 | for (p = gr->gr_mem; *p; p++) { |
2e11036b |
218 | if ((pw = userdb_userByName(*p)) != 0) |
219 | n->c = class_addUser(n->c, pw->pw_uid); |
607937a4 |
220 | } |
8cdc1da9 |
221 | if (!n->c) |
222 | n->c = class_none; |
03f996bd |
223 | } |
607937a4 |
224 | } |
225 | } |
03f996bd |
226 | |
607937a4 |
227 | /* --- @name__scan@ --- * |
228 | * |
229 | * Arguments: @netg *n@ = the netgroup handle we're scanning |
230 | * @const char *host@ = the host name |
231 | * @const char *user@ = the user name |
232 | * @const char *domain@ = the (NIS?) domain name |
233 | * @void *ctx@ = some context pointer |
234 | * |
235 | * Returns: Zero to continue scanning. |
236 | * |
237 | * Use: Scans a netgroup, adding items to the name table. |
238 | */ |
239 | |
240 | /* --- A data type --- */ |
241 | |
242 | typedef struct name__scanctx { |
243 | char *name; /* Netgroup name prefixed with `?_'*/ |
244 | unsigned f; /* Various interesting flags */ |
245 | name *h; /* Name entry for hosts */ |
246 | name *u; /* Name entry for users */ |
247 | } name__scanctx; |
248 | |
249 | enum { f_host = 1, f_user = 2 }; |
250 | |
251 | /* --- And now for the real code --- */ |
252 | |
253 | static int name__scan(netg *n, const char *host, const char *user, |
254 | const char *domain, void *ctx) |
255 | { |
256 | name__scanctx *sc = ctx; |
257 | |
258 | /* --- Add the host to the hosts class --- */ |
259 | |
260 | if (sc->f & f_host && host) { |
261 | struct hostent *h; |
262 | struct in_addr in; |
263 | const char *a; |
264 | |
265 | /* --- First ensure that I have a host class --- */ |
266 | |
267 | if (!sc->h) { |
268 | sc->name[0] = 'h'; |
269 | sc->h = name__get(sc->name, clType_host); |
270 | if (!sc->h) { |
271 | sc->f &= ~f_host; |
272 | goto done_host; |
273 | } |
274 | } |
275 | |
276 | /* --- Now that I've done that, try to add the host --- * |
277 | * |
278 | * I'll turn it into an IP address. There's less chance of confusion |
279 | * that way. |
280 | */ |
281 | |
282 | if ((h = gethostbyname(host)) == 0) |
283 | goto done_host; |
284 | memcpy(&in, h->h_addr, sizeof(in)); |
285 | if ((a = inet_ntoa(in)) == 0) |
286 | goto done_host; |
2e11036b |
287 | sc->h->c = class_addString(sc->h->c, a); |
607937a4 |
288 | done_host:; |
289 | } |
290 | |
291 | /* --- Add the user to the users class --- */ |
03f996bd |
292 | |
607937a4 |
293 | if (sc->f & f_user && user) { |
294 | struct passwd *pw; |
607937a4 |
295 | |
296 | /* --- First ensure that I have a user class --- */ |
297 | |
298 | if (!sc->u) { |
299 | sc->name[0] = 'u'; |
300 | sc->u = name__get(sc->name, clType_user); |
301 | if (!sc->u) { |
302 | sc->f &= ~f_user; |
303 | goto done_user; |
c4f2d992 |
304 | } |
305 | } |
607937a4 |
306 | |
307 | /* --- Add the user to the list --- */ |
308 | |
309 | if ((pw = userdb_userByName(user)) == 0) |
310 | goto done_user; |
2e11036b |
311 | sc->u->c = class_addUser(sc->u->c, pw->pw_uid); |
607937a4 |
312 | done_user:; |
313 | } |
314 | |
315 | return (0); |
316 | } |
317 | |
318 | /* --- @name__netgroups@ --- * |
319 | * |
320 | * Arguments: --- |
321 | * |
322 | * Returns: --- |
323 | * |
324 | * Use: Populates the name table with netgroup information. |
325 | */ |
326 | |
327 | void name__netgroups(void) |
328 | { |
329 | netg *n; |
330 | char buf[32]; |
331 | const char *p; |
332 | name__scanctx sc; |
333 | |
334 | netg_iterate(); |
335 | buf[1] = '_'; |
336 | while ((n = netg_next()) != 0) { |
337 | p = netg_name(n); |
338 | if (name__sanitise(p, buf + 2, sizeof(buf) - 2) == 0) |
339 | continue; |
340 | sc.name = buf; |
341 | sc.u = sc.h = 0; |
342 | sc.f = f_host | f_user; |
343 | netg_scan(n, name__scan, &sc); |
c4f2d992 |
344 | } |
03f996bd |
345 | } |
c4f2d992 |
346 | |
03f996bd |
347 | /* --- @name_init@ --- * |
348 | * |
349 | * Arguments: --- |
350 | * |
351 | * Returns: --- |
352 | * |
353 | * Use: Initialises the name table. Requires the user database to |
607937a4 |
354 | * be populated (see @userdb_local@ and @userdb_yp@, and |
355 | * @netg_init@). |
03f996bd |
356 | */ |
c4f2d992 |
357 | |
03f996bd |
358 | void name_init(void) |
359 | { |
360 | /* --- Initialise the name table --- */ |
c4f2d992 |
361 | |
f60a3434 |
362 | sym_create(&name__table); |
c4f2d992 |
363 | |
03f996bd |
364 | /* --- Add everyone into the table --- */ |
c4f2d992 |
365 | |
03f996bd |
366 | name__users(); |
367 | name__groups(); |
607937a4 |
368 | name__netgroups(); |
c4f2d992 |
369 | |
2e11036b |
370 | /* --- Finally add in the `all' and `none' classes --- * |
c4f2d992 |
371 | * |
2e11036b |
372 | * Do that now, to prevent them being overwritten by the above. |
c4f2d992 |
373 | */ |
374 | |
375 | { |
376 | name *n; |
377 | unsigned f; |
378 | |
379 | n = sym_find(&name__table, "all", -1, sizeof(name), &f); |
380 | if (f) |
381 | class_dec(n->c); |
382 | n->c = class_all; |
2e11036b |
383 | |
384 | n = sym_find(&name__table, "none", -1, sizeof(name), &f); |
385 | if (f) |
386 | class_dec(n->c); |
387 | n->c = class_none; |
c4f2d992 |
388 | } |
389 | } |
390 | |
e6677daf |
391 | /* --- @name_end@ --- * |
c4f2d992 |
392 | * |
393 | * Arguments: --- |
394 | * |
395 | * Returns: --- |
396 | * |
e6677daf |
397 | * Use: Closes down the name database, so that it can be |
398 | * reinitialised. |
c4f2d992 |
399 | */ |
400 | |
e6677daf |
401 | void name_end(void) |
c4f2d992 |
402 | { |
403 | /* --- Empty the symbol table --- */ |
404 | |
405 | { |
406 | sym_iter i; |
407 | name *n; |
408 | |
f60a3434 |
409 | for (sym_mkiter(&i, &name__table); (n = sym_next(&i)) != 0; ) { |
c4f2d992 |
410 | if (n->c) |
411 | class_dec(n->c); |
412 | } |
413 | } |
414 | |
415 | /* --- Destroy and recreate the table --- */ |
416 | |
f60a3434 |
417 | sym_destroy(&name__table); |
c4f2d992 |
418 | } |
419 | |
420 | /* --- @name_find@ --- * |
421 | * |
422 | * Arguments: @const char *p@ = pointer to name to look up |
423 | * @unsigned create@ = whether to create the item |
424 | * @unsigned *f@ = whether the item was created |
425 | * |
426 | * Returns: Pointer to a @name@ block containing the symbol, or |
427 | * zero if it wasn't found and we didn't want to create a |
428 | * new one. |
429 | * |
430 | * Use: Looks up a name in the symbol table and returns the |
431 | * item so located. |
432 | */ |
433 | |
434 | name *name_find(const char *p, unsigned create, unsigned *f) |
435 | { |
436 | /* --- This is a trivial veneer onto @sym_find@ --- */ |
437 | |
438 | return (sym_find(&name__table, p, -1, create ? sizeof(name) : 0, f)); |
439 | } |
440 | |
441 | /* --- @name_dump@ --- * |
442 | * |
03f996bd |
443 | * Arguments: --- |
c4f2d992 |
444 | * |
445 | * Returns: --- |
446 | * |
447 | * Use: Dumps a complete listing of the symbol table. |
448 | */ |
449 | |
03f996bd |
450 | void name_dump(void) |
c4f2d992 |
451 | { |
e6677daf |
452 | #ifdef TRACING |
c4f2d992 |
453 | sym_iter i; |
454 | name *n; |
455 | |
03f996bd |
456 | trace(TRACE_DEBUG, "name: dumping names"); |
f60a3434 |
457 | for (sym_mkiter(&i, &name__table); (n = sym_next(&i)) != 0; ) { |
03f996bd |
458 | trace(TRACE_DEBUG, "name: dumping `%s'", n->base.name); |
8cdc1da9 |
459 | if (!n->c) |
460 | trace(TRACE_DEBUG, "name: <empty>"); |
461 | else |
462 | class_dump(n->c, 1); |
c4f2d992 |
463 | } |
e6677daf |
464 | #endif |
c4f2d992 |
465 | } |
466 | |
467 | /*----- Test driver -------------------------------------------------------*/ |
468 | |
469 | #ifdef TEST_RIG |
470 | |
471 | int main(void) |
472 | { |
607937a4 |
473 | ego("name-test"); |
8bdddfb7 |
474 | trace_on(stdout, TRACE_ALL); |
c4f2d992 |
475 | userdb_init(); |
476 | userdb_local(); |
477 | userdb_yp(); |
607937a4 |
478 | netg_init(); |
c4f2d992 |
479 | name_init(); |
8cdc1da9 |
480 | /* printf("loaded (%lu)\n", track_memused()); */ |
481 | #ifdef notdef |
e6677daf |
482 | getchar(); |
483 | for (;;) { |
484 | name_end(); |
485 | netg_end(); |
486 | userdb_end(); |
8cdc1da9 |
487 | /* printf("cleared (%lu)\n", track_memused()); */ |
488 | /* track_memlist(); */ |
e6677daf |
489 | userdb_init(); |
490 | userdb_local(); |
491 | userdb_yp(); |
492 | netg_init(); |
493 | name_init(); |
8cdc1da9 |
494 | /* printf("reloaded (%lu)\n", track_memused()); */ |
e6677daf |
495 | getchar(); |
496 | } |
8cdc1da9 |
497 | #else |
498 | name_dump(); |
499 | #endif |
c4f2d992 |
500 | return (0); |
501 | } |
502 | |
503 | #endif |