rcmd.c

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