| 1 | /* -*-c-*- |
| 2 | * |
| 3 | * $Id: name.c,v 1.9 2003/10/12 00:39:16 mdw Exp $ |
| 4 | * |
| 5 | * Looking up of names in symbol tables |
| 6 | * |
| 7 | * (c) 1998 EBI |
| 8 | */ |
| 9 | |
| 10 | /*----- Licensing notice --------------------------------------------------* |
| 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 |
| 25 | * along with `become'; if not, write to the Free Software Foundation, |
| 26 | * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
| 27 | */ |
| 28 | |
| 29 | /*----- Revision history --------------------------------------------------* |
| 30 | * |
| 31 | * $Log: name.c,v $ |
| 32 | * Revision 1.9 2003/10/12 00:39:16 mdw |
| 33 | * Light fixes for strange building. |
| 34 | * |
| 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 | * |
| 39 | * Revision 1.7 1998/04/23 13:23:56 mdw |
| 40 | * Fix bugs involving empty classes. |
| 41 | * |
| 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 |
| 46 | * Use rewritten class handler. Support `none' class. |
| 47 | * |
| 48 | * Revision 1.4 1997/08/20 16:17:59 mdw |
| 49 | * Replace `name_reinit' by `name_end' for more sensible restart. |
| 50 | * |
| 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 | * |
| 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 |
| 59 | * Initial revision |
| 60 | * |
| 61 | */ |
| 62 | |
| 63 | /*----- Header files ------------------------------------------------------*/ |
| 64 | |
| 65 | /* --- ANSI headers --- */ |
| 66 | |
| 67 | #include <ctype.h> |
| 68 | #include <stdio.h> |
| 69 | #include <stdlib.h> |
| 70 | #include <string.h> |
| 71 | |
| 72 | /* --- Unix headers --- */ |
| 73 | |
| 74 | #include <sys/types.h> |
| 75 | #include <sys/socket.h> |
| 76 | |
| 77 | #include <netinet/in.h> |
| 78 | |
| 79 | #include <arpa/inet.h> |
| 80 | |
| 81 | #include <netdb.h> |
| 82 | #include <grp.h> |
| 83 | #include <pwd.h> |
| 84 | |
| 85 | /* --- mLib headers --- */ |
| 86 | |
| 87 | #include <mLib/alloc.h> |
| 88 | #include <mLib/sym.h> |
| 89 | |
| 90 | /* --- Local headers --- */ |
| 91 | |
| 92 | #include "config.h" |
| 93 | |
| 94 | #include "become.h" |
| 95 | #include "class.h" |
| 96 | #include "name.h" |
| 97 | #include "netg.h" |
| 98 | #include "userdb.h" |
| 99 | |
| 100 | /*----- Static variables --------------------------------------------------*/ |
| 101 | |
| 102 | static sym_table name__table; /* Symbol table for everything */ |
| 103 | |
| 104 | /*----- Main code ---------------------------------------------------------*/ |
| 105 | |
| 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); |
| 121 | if (!f) |
| 122 | n->c = 0; |
| 123 | return ((n->c && !(n->c->type & type)) ? 0 : n); |
| 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 | |
| 156 | /* --- @name__users@ --- * |
| 157 | * |
| 158 | * Arguments: --- |
| 159 | * |
| 160 | * Returns: --- |
| 161 | * |
| 162 | * Use: Adds all of the users registered with the user database to |
| 163 | * the name table. Also adds the users' primary groups. |
| 164 | */ |
| 165 | |
| 166 | static void name__users(void) |
| 167 | { |
| 168 | struct passwd *pw; |
| 169 | struct group *gr; |
| 170 | char buf[32]; |
| 171 | |
| 172 | userdb_iterateUsers(); |
| 173 | while ((pw = userdb_nextUser()) != 0) { |
| 174 | name *n; |
| 175 | uid_t u = pw->pw_uid; |
| 176 | |
| 177 | /* --- First, add the user to the table --- */ |
| 178 | |
| 179 | if (name__sanitise(pw->pw_name, buf, sizeof(buf)) && |
| 180 | (n = name__get(buf, clType_user)) != 0) |
| 181 | n->c = class_addUser(n->c, u); |
| 182 | |
| 183 | /* --- Now handle the user's default group --- */ |
| 184 | |
| 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) |
| 188 | n->c = class_addUser(n->c, u); |
| 189 | } |
| 190 | } |
| 191 | |
| 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; |
| 206 | char buf[32]; |
| 207 | |
| 208 | userdb_iterateGroups(); |
| 209 | while ((gr = userdb_nextGroup()) != 0) { |
| 210 | name *n; |
| 211 | |
| 212 | if (name__sanitise(gr->gr_name, buf, sizeof(buf)) && |
| 213 | (n = name__get(buf, clType_user)) != 0) { |
| 214 | |
| 215 | /* --- Now add all of the members --- */ |
| 216 | |
| 217 | for (p = gr->gr_mem; *p; p++) { |
| 218 | if ((pw = userdb_userByName(*p)) != 0) |
| 219 | n->c = class_addUser(n->c, pw->pw_uid); |
| 220 | } |
| 221 | if (!n->c) |
| 222 | n->c = class_none; |
| 223 | } |
| 224 | } |
| 225 | } |
| 226 | |
| 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; |
| 287 | sc->h->c = class_addString(sc->h->c, a); |
| 288 | done_host:; |
| 289 | } |
| 290 | |
| 291 | /* --- Add the user to the users class --- */ |
| 292 | |
| 293 | if (sc->f & f_user && user) { |
| 294 | struct passwd *pw; |
| 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; |
| 304 | } |
| 305 | } |
| 306 | |
| 307 | /* --- Add the user to the list --- */ |
| 308 | |
| 309 | if ((pw = userdb_userByName(user)) == 0) |
| 310 | goto done_user; |
| 311 | sc->u->c = class_addUser(sc->u->c, pw->pw_uid); |
| 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); |
| 344 | } |
| 345 | } |
| 346 | |
| 347 | /* --- @name_init@ --- * |
| 348 | * |
| 349 | * Arguments: --- |
| 350 | * |
| 351 | * Returns: --- |
| 352 | * |
| 353 | * Use: Initialises the name table. Requires the user database to |
| 354 | * be populated (see @userdb_local@ and @userdb_yp@, and |
| 355 | * @netg_init@). |
| 356 | */ |
| 357 | |
| 358 | void name_init(void) |
| 359 | { |
| 360 | /* --- Initialise the name table --- */ |
| 361 | |
| 362 | sym_create(&name__table); |
| 363 | |
| 364 | /* --- Add everyone into the table --- */ |
| 365 | |
| 366 | name__users(); |
| 367 | name__groups(); |
| 368 | name__netgroups(); |
| 369 | |
| 370 | /* --- Finally add in the `all' and `none' classes --- * |
| 371 | * |
| 372 | * Do that now, to prevent them being overwritten by the above. |
| 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; |
| 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; |
| 388 | } |
| 389 | } |
| 390 | |
| 391 | /* --- @name_end@ --- * |
| 392 | * |
| 393 | * Arguments: --- |
| 394 | * |
| 395 | * Returns: --- |
| 396 | * |
| 397 | * Use: Closes down the name database, so that it can be |
| 398 | * reinitialised. |
| 399 | */ |
| 400 | |
| 401 | void name_end(void) |
| 402 | { |
| 403 | /* --- Empty the symbol table --- */ |
| 404 | |
| 405 | { |
| 406 | sym_iter i; |
| 407 | name *n; |
| 408 | |
| 409 | for (sym_mkiter(&i, &name__table); (n = sym_next(&i)) != 0; ) { |
| 410 | if (n->c) |
| 411 | class_dec(n->c); |
| 412 | } |
| 413 | } |
| 414 | |
| 415 | /* --- Destroy and recreate the table --- */ |
| 416 | |
| 417 | sym_destroy(&name__table); |
| 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 | * |
| 443 | * Arguments: --- |
| 444 | * |
| 445 | * Returns: --- |
| 446 | * |
| 447 | * Use: Dumps a complete listing of the symbol table. |
| 448 | */ |
| 449 | |
| 450 | void name_dump(void) |
| 451 | { |
| 452 | #ifdef TRACING |
| 453 | sym_iter i; |
| 454 | name *n; |
| 455 | |
| 456 | trace(TRACE_DEBUG, "name: dumping names"); |
| 457 | for (sym_mkiter(&i, &name__table); (n = sym_next(&i)) != 0; ) { |
| 458 | trace(TRACE_DEBUG, "name: dumping `%s'", n->base.name); |
| 459 | if (!n->c) |
| 460 | trace(TRACE_DEBUG, "name: <empty>"); |
| 461 | else |
| 462 | class_dump(n->c, 1); |
| 463 | } |
| 464 | #endif |
| 465 | } |
| 466 | |
| 467 | /*----- Test driver -------------------------------------------------------*/ |
| 468 | |
| 469 | #ifdef TEST_RIG |
| 470 | |
| 471 | int main(void) |
| 472 | { |
| 473 | ego("name-test"); |
| 474 | trace_on(stdout, TRACE_ALL); |
| 475 | userdb_init(); |
| 476 | userdb_local(); |
| 477 | userdb_yp(); |
| 478 | netg_init(); |
| 479 | name_init(); |
| 480 | /* printf("loaded (%lu)\n", track_memused()); */ |
| 481 | #ifdef notdef |
| 482 | getchar(); |
| 483 | for (;;) { |
| 484 | name_end(); |
| 485 | netg_end(); |
| 486 | userdb_end(); |
| 487 | /* printf("cleared (%lu)\n", track_memused()); */ |
| 488 | /* track_memlist(); */ |
| 489 | userdb_init(); |
| 490 | userdb_local(); |
| 491 | userdb_yp(); |
| 492 | netg_init(); |
| 493 | name_init(); |
| 494 | /* printf("reloaded (%lu)\n", track_memused()); */ |
| 495 | getchar(); |
| 496 | } |
| 497 | #else |
| 498 | name_dump(); |
| 499 | #endif |
| 500 | return (0); |
| 501 | } |
| 502 | |
| 503 | #endif |