rcmd.c 20 KB

123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169170171172173174175176177178179180181182183184185186187188189190191192193194195196197198199200201202203204205206207208209210211212213214215216217218219220221222223224225226227228229230231232233234235236237238239240241242243244245246247248249250251252253254255256257258259260261262263264265266267268269270271272273274275276277278279280281282283284285286287288289290291292293294295296297298299300301302303304305306307308309310311312313314315316317318319320321322323324325326327328329330331332333334335336337338339340341342343344345346347348349350351352353354355356357358359360361362363364365366367368369370371372373374375376377378379380381382383384385386387388389390391392393394395396397398399400401402403404405406407408409410411412413414415416417418419420421422423424425426427428429430431432433434435436437438439440441442443444445446447448449450451452453454455456457458459460461462463464465466467468469470471472473474475476477478479480481482483484485486487488489490491492493494495496497498499500501502503504505506507508509510511512513514515516517518519520521522523524525526527528529530531532533534535536537538539540541542543544545546547548549550551552553554555556557558559560561562563564565566567568569570571572573574575576577578579580581582583584585586587588589590591592593594595596597598599600601602603604605606607608609610611612613614615616617618619620621622623624625626627628629630631632633634635636637638639640641642643644645646647648649650651652653654655656657658659660661662663664665666667668669670671672673674675676677678679680681682683684685686687688689690691692693694695696697698699700701702703704705706707708709710711712713714715716717718719720721722723724725726727728729730731732733734735736737738739740741742743744745746747748749750751752753754755756757758759760761762763764765766767768769770771772773774775776777778779780781782
  1. /*
  2. * Copyright (C) 1998 WIDE Project.
  3. * All rights reserved.
  4. *
  5. * Redistribution and use in source and binary forms, with or without
  6. * modification, are permitted provided that the following conditions
  7. * are met:
  8. * 1. Redistributions of source code must retain the above copyright
  9. * notice, this list of conditions and the following disclaimer.
  10. * 2. Redistributions in binary form must reproduce the above copyright
  11. * notice, this list of conditions and the following disclaimer in the
  12. * documentation and/or other materials provided with the distribution.
  13. * 3. Neither the name of the project nor the names of its contributors
  14. * may be used to endorse or promote products derived from this software
  15. * without specific prior written permission.
  16. *
  17. * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
  18. * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  19. * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  20. * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
  21. * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  22. * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  23. * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  24. * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  25. * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  26. * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  27. * SUCH DAMAGE.
  28. */
  29. /*
  30. * Copyright (c) 1983, 1993, 1994
  31. * The Regents of the University of California. All rights reserved.
  32. *
  33. * Redistribution and use in source and binary forms, with or without
  34. * modification, are permitted provided that the following conditions
  35. * are met:
  36. * 1. Redistributions of source code must retain the above copyright
  37. * notice, this list of conditions and the following disclaimer.
  38. * 2. Redistributions in binary form must reproduce the above copyright
  39. * notice, this list of conditions and the following disclaimer in the
  40. * documentation and/or other materials provided with the distribution.
  41. * 4. Neither the name of the University nor the names of its contributors
  42. * may be used to endorse or promote products derived from this software
  43. * without specific prior written permission.
  44. *
  45. * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  46. * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  47. * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  48. * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  49. * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  50. * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  51. * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  52. * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  53. * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  54. * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  55. * SUCH DAMAGE.
  56. */
  57. #if 0
  58. static char sccsid[] = "@(#)rcmd.c 8.3 (Berkeley) 3/26/94";
  59. #endif /* LIBC_SCCS and not lint */
  60. #define __UCLIBC_HIDE_DEPRECATED__
  61. #include <features.h>
  62. #include <sys/param.h>
  63. #include <sys/poll.h>
  64. #include <sys/socket.h>
  65. #include <sys/stat.h>
  66. #include <netinet/in.h>
  67. #include <arpa/inet.h>
  68. #include <alloca.h>
  69. #include <signal.h>
  70. #include <fcntl.h>
  71. #include <netdb.h>
  72. #include <unistd.h>
  73. #include <pwd.h>
  74. #include <errno.h>
  75. #include <stdio.h>
  76. #include <stdio_ext.h>
  77. #include <ctype.h>
  78. #include <string.h>
  79. #include <libintl.h>
  80. #include <stdlib.h>
  81. #ifdef __UCLIBC_HAS_WCHAR__
  82. #include <wchar.h>
  83. #endif
  84. #include <sys/uio.h>
  85. /* Experimentally off - libc_hidden_proto(memcmp) */
  86. /* Experimentally off - libc_hidden_proto(strcat) */
  87. /* Experimentally off - libc_hidden_proto(strchr) */
  88. /* Experimentally off - libc_hidden_proto(strcmp) */
  89. /* Experimentally off - libc_hidden_proto(strcpy) */
  90. /* Experimentally off - libc_hidden_proto(strlen) */
  91. /* Experimentally off - libc_hidden_proto(strncmp) */
  92. /* Experimentally off - libc_hidden_proto(memmove) */
  93. /* libc_hidden_proto(getpid) */
  94. /* libc_hidden_proto(socket) */
  95. /* libc_hidden_proto(close) */
  96. /* libc_hidden_proto(fcntl) */
  97. /* libc_hidden_proto(read) */
  98. /* libc_hidden_proto(write) */
  99. /* libc_hidden_proto(perror) */
  100. /* libc_hidden_proto(lstat) */
  101. /* libc_hidden_proto(fstat) */
  102. /* libc_hidden_proto(tolower) */
  103. libc_hidden_proto(sysconf)
  104. libc_hidden_proto(getline)
  105. libc_hidden_proto(geteuid)
  106. libc_hidden_proto(seteuid)
  107. libc_hidden_proto(getpwnam_r)
  108. libc_hidden_proto(gethostbyname)
  109. libc_hidden_proto(gethostbyname_r)
  110. libc_hidden_proto(fileno)
  111. libc_hidden_proto(sleep)
  112. libc_hidden_proto(inet_addr)
  113. libc_hidden_proto(inet_ntoa)
  114. libc_hidden_proto(herror)
  115. libc_hidden_proto(bind)
  116. libc_hidden_proto(connect)
  117. libc_hidden_proto(sigblock)
  118. libc_hidden_proto(snprintf)
  119. /* libc_hidden_proto(poll) */
  120. libc_hidden_proto(accept)
  121. libc_hidden_proto(listen)
  122. libc_hidden_proto(sigsetmask)
  123. libc_hidden_proto(getc_unlocked)
  124. libc_hidden_proto(__fgetc_unlocked)
  125. /* libc_hidden_proto(fopen) */
  126. /* libc_hidden_proto(fclose) */
  127. /* libc_hidden_proto(fprintf) */
  128. libc_hidden_proto(__h_errno_location)
  129. #ifdef __UCLIBC_HAS_XLOCALE__
  130. /* libc_hidden_proto(__ctype_b_loc) */
  131. /* libc_hidden_proto(__ctype_tolower_loc) */
  132. #elif defined __UCLIBC_HAS_CTYPE_TABLES__
  133. /* libc_hidden_proto(__ctype_b) */
  134. /* libc_hidden_proto(__ctype_tolower) */
  135. #endif
  136. libc_hidden_proto(rresvport)
  137. /* some forward declarations */
  138. static int __ivaliduser2(FILE *hostf, u_int32_t raddr,
  139. const char *luser, const char *ruser, const char *rhost);
  140. static int iruserok2 (u_int32_t raddr, int superuser, const char *ruser,
  141. const char *luser, const char *rhost);
  142. int rcmd(ahost, rport, locuser, remuser, cmd, fd2p)
  143. char **ahost;
  144. u_short rport;
  145. const char *locuser, *remuser, *cmd;
  146. int *fd2p;
  147. {
  148. #ifdef __UCLIBC_HAS_REENTRANT_RPC__
  149. int herr;
  150. struct hostent hostbuf;
  151. size_t hstbuflen;
  152. char *tmphstbuf;
  153. #endif
  154. struct hostent *hp;
  155. struct sockaddr_in sin, from;
  156. struct pollfd pfd[2];
  157. int32_t oldmask;
  158. pid_t pid;
  159. int s, lport, timo;
  160. char c;
  161. pid = getpid();
  162. #ifdef __UCLIBC_HAS_REENTRANT_RPC__
  163. hstbuflen = 1024;
  164. #ifdef __ARCH_USE_MMU__
  165. tmphstbuf = alloca (hstbuflen);
  166. #else
  167. tmphstbuf = malloc (hstbuflen);
  168. #endif
  169. while (gethostbyname_r (*ahost, &hostbuf, tmphstbuf,
  170. hstbuflen, &hp, &herr) != 0 || hp == NULL)
  171. {
  172. if (herr != NETDB_INTERNAL || errno != ERANGE)
  173. {
  174. __set_h_errno (herr);
  175. #ifndef __ARCH_USE_MMU__
  176. free(tmphstbuf);
  177. #endif
  178. herror(*ahost);
  179. return -1;
  180. }
  181. else
  182. {
  183. /* Enlarge the buffer. */
  184. hstbuflen *= 2;
  185. #ifdef __ARCH_USE_MMU__
  186. tmphstbuf = alloca (hstbuflen);
  187. #else
  188. free(tmphstbuf);
  189. tmphstbuf = malloc (hstbuflen);
  190. #endif
  191. }
  192. }
  193. #ifndef __ARCH_USE_MMU__
  194. free(tmphstbuf);
  195. #endif
  196. #else /* call the non-reentrant version */
  197. if ((hp = gethostbyname(*ahost)) == NULL) {
  198. return -1;
  199. }
  200. #endif
  201. pfd[0].events = POLLIN;
  202. pfd[1].events = POLLIN;
  203. *ahost = hp->h_name;
  204. oldmask = sigblock(sigmask(SIGURG)); /* __sigblock */
  205. for (timo = 1, lport = IPPORT_RESERVED - 1;;) {
  206. s = rresvport(&lport);
  207. if (s < 0) {
  208. if (errno == EAGAIN)
  209. (void)fprintf(stderr,
  210. "rcmd: socket: All ports in use\n");
  211. else
  212. (void)fprintf(stderr, "rcmd: socket: %m\n");
  213. sigsetmask(oldmask); /* sigsetmask */
  214. return -1;
  215. }
  216. fcntl(s, F_SETOWN, pid);
  217. sin.sin_family = hp->h_addrtype;
  218. memmove(&sin.sin_addr, hp->h_addr_list[0],
  219. MIN (sizeof (sin.sin_addr), hp->h_length));
  220. sin.sin_port = rport;
  221. if (connect(s, (struct sockaddr *)&sin, sizeof(sin)) >= 0) /* __connect */
  222. break;
  223. (void)close(s);
  224. if (errno == EADDRINUSE) {
  225. lport--;
  226. continue;
  227. }
  228. if (errno == ECONNREFUSED && timo <= 16) {
  229. (void)sleep(timo); /* __sleep */
  230. timo *= 2;
  231. continue;
  232. }
  233. if (hp->h_addr_list[1] != NULL) {
  234. int oerrno = errno;
  235. (void)fprintf(stderr, "connect to address %s: ",
  236. inet_ntoa(sin.sin_addr));
  237. __set_errno (oerrno);
  238. perror(0);
  239. hp->h_addr_list++;
  240. memmove(&sin.sin_addr, hp->h_addr_list[0],
  241. MIN (sizeof (sin.sin_addr), hp->h_length));
  242. (void)fprintf(stderr, "Trying %s...\n",
  243. inet_ntoa(sin.sin_addr));
  244. continue;
  245. }
  246. (void)fprintf(stderr, "%s: %m\n", hp->h_name);
  247. sigsetmask(oldmask); /* __sigsetmask */
  248. return -1;
  249. }
  250. lport--;
  251. if (fd2p == 0) {
  252. write(s, "", 1);
  253. lport = 0;
  254. } else {
  255. char num[8];
  256. int s2 = rresvport(&lport), s3;
  257. socklen_t len = sizeof(from);
  258. if (s2 < 0)
  259. goto bad;
  260. listen(s2, 1);
  261. (void)snprintf(num, sizeof(num), "%d", lport); /* __snprintf */
  262. if (write(s, num, strlen(num)+1) != strlen(num)+1) {
  263. (void)fprintf(stderr,
  264. "rcmd: write (setting up stderr): %m\n");
  265. (void)close(s2);
  266. goto bad;
  267. }
  268. pfd[0].fd = s;
  269. pfd[1].fd = s2;
  270. __set_errno (0);
  271. if (poll (pfd, 2, -1) < 1 || (pfd[1].revents & POLLIN) == 0){
  272. if (errno != 0)
  273. (void)fprintf(stderr, "rcmd: poll (setting up stderr): %m\n");
  274. else
  275. (void)fprintf(stderr, "poll: protocol failure in circuit setup\n");
  276. (void)close(s2);
  277. goto bad;
  278. }
  279. s3 = accept(s2, (struct sockaddr *)&from, &len);
  280. (void)close(s2);
  281. if (s3 < 0) {
  282. (void)fprintf(stderr,
  283. "rcmd: accept: %m\n");
  284. lport = 0;
  285. goto bad;
  286. }
  287. *fd2p = s3;
  288. from.sin_port = ntohs((u_short)from.sin_port);
  289. if (from.sin_family != AF_INET ||
  290. from.sin_port >= IPPORT_RESERVED ||
  291. from.sin_port < IPPORT_RESERVED / 2) {
  292. (void)fprintf(stderr,
  293. "socket: protocol failure in circuit setup\n");
  294. goto bad2;
  295. }
  296. }
  297. (void)write(s, locuser, strlen(locuser)+1);
  298. (void)write(s, remuser, strlen(remuser)+1);
  299. (void)write(s, cmd, strlen(cmd)+1);
  300. if (read(s, &c, 1) != 1) {
  301. (void)fprintf(stderr,
  302. "rcmd: %s: %m\n", *ahost);
  303. goto bad2;
  304. }
  305. if (c != 0) {
  306. while (read(s, &c, 1) == 1) {
  307. (void)write(STDERR_FILENO, &c, 1);
  308. if (c == '\n')
  309. break;
  310. }
  311. goto bad2;
  312. }
  313. sigsetmask(oldmask);
  314. return s;
  315. bad2:
  316. if (lport)
  317. (void)close(*fd2p);
  318. bad:
  319. (void)close(s);
  320. sigsetmask(oldmask);
  321. return -1;
  322. }
  323. int rresvport(int *alport)
  324. {
  325. struct sockaddr_in sin;
  326. int s;
  327. sin.sin_family = AF_INET;
  328. sin.sin_addr.s_addr = INADDR_ANY;
  329. s = socket(AF_INET, SOCK_STREAM, 0);
  330. if (s < 0)
  331. return -1;
  332. for (;;) {
  333. sin.sin_port = htons((u_short)*alport);
  334. if (bind(s, (struct sockaddr *)&sin, sizeof(sin)) >= 0)
  335. return s;
  336. if (errno != EADDRINUSE) {
  337. (void)close(s);
  338. return -1;
  339. }
  340. (*alport)--;
  341. if (*alport == IPPORT_RESERVED/2) {
  342. (void)close(s);
  343. __set_errno (EAGAIN); /* close */
  344. return -1;
  345. }
  346. }
  347. return -1;
  348. }
  349. libc_hidden_def(rresvport)
  350. /* This needs to be exported ... while it is not a documented interface
  351. * for rcp related apps, it's a required one that is used to control the
  352. * rhost behavior. Legacy sucks.
  353. */
  354. int __check_rhosts_file = 1;
  355. int ruserok(rhost, superuser, ruser, luser)
  356. const char *rhost, *ruser, *luser;
  357. int superuser;
  358. {
  359. struct hostent *hp;
  360. u_int32_t addr;
  361. char **ap;
  362. #ifdef __UCLIBC_HAS_REENTRANT_RPC__
  363. size_t buflen;
  364. char *buffer;
  365. int herr;
  366. struct hostent hostbuf;
  367. #endif
  368. #ifdef __UCLIBC_HAS_REENTRANT_RPC__
  369. buflen = 1024;
  370. #ifdef __ARCH_USE_MMU__
  371. buffer = alloca (buflen);
  372. #else
  373. buffer = malloc (buflen);
  374. #endif
  375. while (gethostbyname_r (rhost, &hostbuf, buffer,
  376. buflen, &hp, &herr) != 0 || hp == NULL)
  377. {
  378. if (herr != NETDB_INTERNAL || errno != ERANGE) {
  379. #ifndef __ARCH_USE_MMU__
  380. free(buffer);
  381. #endif
  382. return -1;
  383. } else
  384. {
  385. /* Enlarge the buffer. */
  386. buflen *= 2;
  387. #ifdef __ARCH_USE_MMU__
  388. buffer = alloca (buflen);
  389. #else
  390. free(buffer);
  391. buffer = malloc (buflen);
  392. #endif
  393. }
  394. }
  395. #ifndef __ARCH_USE_MMU__
  396. free(buffer);
  397. #endif
  398. #else
  399. if ((hp = gethostbyname(rhost)) == NULL) {
  400. return -1;
  401. }
  402. #endif
  403. for (ap = hp->h_addr_list; *ap; ++ap) {
  404. memmove(&addr, *ap, sizeof(addr));
  405. if (iruserok2(addr, superuser, ruser, luser, rhost) == 0)
  406. return 0;
  407. }
  408. return -1;
  409. }
  410. /* Extremely paranoid file open function. */
  411. static FILE *
  412. iruserfopen (const char *file, uid_t okuser)
  413. {
  414. struct stat st;
  415. char *cp = NULL;
  416. FILE *res = NULL;
  417. /* If not a regular file, if owned by someone other than user or
  418. root, if writeable by anyone but the owner, or if hardlinked
  419. anywhere, quit. */
  420. if (lstat (file, &st))
  421. cp = "lstat failed";
  422. else if (!S_ISREG (st.st_mode))
  423. cp = "not regular file";
  424. else
  425. {
  426. res = fopen (file, "r");
  427. if (!res)
  428. cp = "cannot open";
  429. else if (fstat (fileno (res), &st) < 0)
  430. cp = "fstat failed";
  431. else if (st.st_uid && st.st_uid != okuser)
  432. cp = "bad owner";
  433. else if (st.st_mode & (S_IWGRP|S_IWOTH))
  434. cp = "writeable by other than owner";
  435. else if (st.st_nlink > 1)
  436. cp = "hard linked somewhere";
  437. }
  438. /* If there were any problems, quit. */
  439. if (cp != NULL)
  440. {
  441. if (res)
  442. fclose (res);
  443. return NULL;
  444. }
  445. return res;
  446. }
  447. /*
  448. * New .rhosts strategy: We are passed an ip address. We spin through
  449. * hosts.equiv and .rhosts looking for a match. When the .rhosts only
  450. * has ip addresses, we don't have to trust a nameserver. When it
  451. * contains hostnames, we spin through the list of addresses the nameserver
  452. * gives us and look for a match.
  453. *
  454. * Returns 0 if ok, -1 if not ok.
  455. */
  456. static int
  457. iruserok2 (raddr, superuser, ruser, luser, rhost)
  458. u_int32_t raddr;
  459. int superuser;
  460. const char *ruser, *luser, *rhost;
  461. {
  462. FILE *hostf = NULL;
  463. int isbad = -1;
  464. if (!superuser)
  465. hostf = iruserfopen (_PATH_HEQUIV, 0);
  466. if (hostf) {
  467. isbad = __ivaliduser2 (hostf, raddr, luser, ruser, rhost);
  468. fclose (hostf);
  469. if (!isbad)
  470. return 0;
  471. }
  472. if (__check_rhosts_file || superuser) {
  473. char *pbuf;
  474. struct passwd *pwd;
  475. size_t dirlen;
  476. uid_t uid;
  477. #ifdef __UCLIBC_HAS_REENTRANT_RPC__
  478. size_t buflen = sysconf (_SC_GETPW_R_SIZE_MAX);
  479. struct passwd pwdbuf;
  480. #ifdef __ARCH_USE_MMU__
  481. char *buffer = alloca (buflen);
  482. #else
  483. char *buffer = malloc (buflen);
  484. #endif
  485. if (getpwnam_r (luser, &pwdbuf, buffer,
  486. buflen, &pwd) != 0 || pwd == NULL)
  487. {
  488. #ifndef __ARCH_USE_MMU__
  489. free(buffer);
  490. #endif
  491. return -1;
  492. }
  493. #ifndef __ARCH_USE_MMU__
  494. free(buffer);
  495. #endif
  496. #else
  497. if ((pwd = getpwnam(luser)) == NULL)
  498. return -1;
  499. #endif
  500. dirlen = strlen (pwd->pw_dir);
  501. pbuf = malloc (dirlen + sizeof "/.rhosts");
  502. strcpy (pbuf, pwd->pw_dir);
  503. strcat (pbuf, "/.rhosts");
  504. /* Change effective uid while reading .rhosts. If root and
  505. reading an NFS mounted file system, can't read files that
  506. are protected read/write owner only. */
  507. uid = geteuid ();
  508. seteuid (pwd->pw_uid);
  509. hostf = iruserfopen (pbuf, pwd->pw_uid);
  510. free(pbuf);
  511. if (hostf != NULL) {
  512. isbad = __ivaliduser2 (hostf, raddr, luser, ruser, rhost);
  513. fclose (hostf);
  514. }
  515. seteuid (uid);
  516. return isbad;
  517. }
  518. return -1;
  519. }
  520. /* This is the exported version. */
  521. int iruserok (u_int32_t raddr, int superuser, const char * ruser, const char * luser);
  522. int iruserok (u_int32_t raddr, int superuser, const char * ruser, const char * luser)
  523. {
  524. return iruserok2 (raddr, superuser, ruser, luser, "-");
  525. }
  526. /*
  527. * XXX
  528. * Don't make static, used by lpd(8).
  529. *
  530. * This function is not used anymore. It is only present because lpd(8)
  531. * calls it (!?!). We simply call __invaliduser2() with an illegal rhost
  532. * argument. This means that netgroups won't work in .rhost/hosts.equiv
  533. * files. If you want lpd to work with netgroups, fix lpd to use ruserok()
  534. * or PAM.
  535. * Returns 0 if ok, -1 if not ok.
  536. */
  537. int
  538. __ivaliduser(FILE *hostf, u_int32_t raddr, const char *luser, const char *ruser);
  539. int
  540. __ivaliduser(FILE *hostf, u_int32_t raddr, const char *luser, const char *ruser)
  541. {
  542. return __ivaliduser2(hostf, raddr, luser, ruser, "-");
  543. }
  544. /* Returns 1 on positive match, 0 on no match, -1 on negative match. */
  545. static int
  546. __icheckhost (u_int32_t raddr, char *lhost, const char *rhost)
  547. {
  548. struct hostent *hp;
  549. u_int32_t laddr;
  550. int negate=1; /* Multiply return with this to get -1 instead of 1 */
  551. char **pp;
  552. #ifdef __UCLIBC_HAS_REENTRANT_RPC__
  553. int save_errno;
  554. size_t buflen;
  555. char *buffer;
  556. struct hostent hostbuf;
  557. int herr;
  558. #endif
  559. #ifdef HAVE_NETGROUP
  560. /* Check nis netgroup. */
  561. if (strncmp ("+@", lhost, 2) == 0)
  562. return innetgr (&lhost[2], rhost, NULL, NULL);
  563. if (strncmp ("-@", lhost, 2) == 0)
  564. return -innetgr (&lhost[2], rhost, NULL, NULL);
  565. #endif /* HAVE_NETGROUP */
  566. /* -host */
  567. if (strncmp ("-", lhost,1) == 0) {
  568. negate = -1;
  569. lhost++;
  570. } else if (strcmp ("+",lhost) == 0) {
  571. return 1; /* asking for trouble, but ok.. */
  572. }
  573. /* Try for raw ip address first. */
  574. if (isdigit (*lhost) && (laddr = inet_addr (lhost)) != INADDR_NONE)
  575. return negate * (! (raddr ^ laddr));
  576. /* Better be a hostname. */
  577. #ifdef __UCLIBC_HAS_REENTRANT_RPC__
  578. buflen = 1024;
  579. buffer = malloc(buflen);
  580. save_errno = errno;
  581. while (gethostbyname_r (lhost, &hostbuf, buffer, buflen, &hp, &herr)
  582. != 0) {
  583. free(buffer);
  584. return (0);
  585. }
  586. free(buffer);
  587. __set_errno (save_errno);
  588. #else
  589. hp = gethostbyname(lhost);
  590. #endif /* __UCLIBC_HAS_REENTRANT_RPC__ */
  591. if (hp == NULL)
  592. return 0;
  593. /* Spin through ip addresses. */
  594. for (pp = hp->h_addr_list; *pp; ++pp)
  595. if (!memcmp (&raddr, *pp, sizeof (u_int32_t)))
  596. return negate;
  597. /* No match. */
  598. return (0);
  599. }
  600. /* Returns 1 on positive match, 0 on no match, -1 on negative match. */
  601. static int
  602. __icheckuser (const char *luser, const char *ruser)
  603. {
  604. /*
  605. luser is user entry from .rhosts/hosts.equiv file
  606. ruser is user id on remote host
  607. */
  608. #ifdef HAVE_NETGROUP
  609. /* [-+]@netgroup */
  610. if (strncmp ("+@", luser, 2) == 0)
  611. return innetgr (&luser[2], NULL, ruser, NULL);
  612. if (strncmp ("-@", luser,2) == 0)
  613. return -innetgr (&luser[2], NULL, ruser, NULL);
  614. #endif /* HAVE_NETGROUP */
  615. /* -user */
  616. if (strncmp ("-", luser, 1) == 0)
  617. return -(strcmp (&luser[1], ruser) == 0);
  618. /* + */
  619. if (strcmp ("+", luser) == 0)
  620. return 1;
  621. /* simple string match */
  622. return strcmp (ruser, luser) == 0;
  623. }
  624. /*
  625. * Returns 1 for blank lines (or only comment lines) and 0 otherwise
  626. */
  627. static int
  628. __isempty(char *p)
  629. {
  630. while (*p && isspace (*p)) {
  631. ++p;
  632. }
  633. return (*p == '\0' || *p == '#') ? 1 : 0 ;
  634. }
  635. /*
  636. * Returns 0 if positive match, -1 if _not_ ok.
  637. */
  638. static int
  639. __ivaliduser2(hostf, raddr, luser, ruser, rhost)
  640. FILE *hostf;
  641. u_int32_t raddr;
  642. const char *luser, *ruser, *rhost;
  643. {
  644. register const char *user;
  645. register char *p;
  646. int hcheck, ucheck;
  647. char *buf = NULL;
  648. size_t bufsize = 0;
  649. int retval = -1;
  650. while (getline (&buf, &bufsize, hostf) > 0) {
  651. buf[bufsize - 1] = '\0'; /* Make sure it's terminated. */
  652. p = buf;
  653. /* Skip empty or comment lines */
  654. if (__isempty (p)) {
  655. continue;
  656. }
  657. /* Skip lines that are too long. */
  658. if (strchr (p, '\n') == NULL) {
  659. int ch = getc_unlocked (hostf);
  660. while (ch != '\n' && ch != EOF)
  661. ch = getc_unlocked (hostf);
  662. continue;
  663. }
  664. for (;*p && !isspace(*p); ++p) {
  665. *p = tolower (*p);
  666. }
  667. /* Next we want to find the permitted name for the remote user. */
  668. if (*p == ' ' || *p == '\t') {
  669. /* <nul> terminate hostname and skip spaces */
  670. for (*p++='\0'; *p && isspace (*p); ++p);
  671. user = p; /* this is the user's name */
  672. while (*p && !isspace (*p))
  673. ++p; /* find end of user's name */
  674. } else
  675. user = p;
  676. *p = '\0'; /* <nul> terminate username (+host?) */
  677. /* buf -> host(?) ; user -> username(?) */
  678. /* First check host part */
  679. hcheck = __icheckhost (raddr, buf, rhost);
  680. if (hcheck < 0)
  681. break;
  682. if (hcheck) {
  683. /* Then check user part */
  684. if (! (*user))
  685. user = luser;
  686. ucheck = __icheckuser (user, ruser);
  687. /* Positive 'host user' match? */
  688. if (ucheck > 0) {
  689. retval = 0;
  690. break;
  691. }
  692. /* Negative 'host -user' match? */
  693. if (ucheck < 0)
  694. break;
  695. /* Neither, go on looking for match */
  696. }
  697. }
  698. free (buf);
  699. return retval;
  700. }