1 /* $NetBSD: pcnfsd_misc.c,v 1.8 2002/08/02 14:06:07 christos Exp $ */ 2 3 /* RE_SID: @(%)/usr/dosnfs/shades_SCCS/unix/pcnfsd/v2/src/SCCS/s.pcnfsd_misc.c 1.5 92/01/24 19:59:13 SMI */ 4 /* 5 **===================================================================== 6 ** Copyright (c) 1986,1987,1988,1989,1990,1991 by Sun Microsystems, Inc. 7 ** @(#)pcnfsd_misc.c 1.5 1/24/92 8 **===================================================================== 9 */ 10 /* 11 **===================================================================== 12 ** I N C L U D E F I L E S E C T I O N * 13 ** * 14 ** If your port requires different include files, add a suitable * 15 ** #define in the customization section, and make the inclusion or * 16 ** exclusion of the files conditional on this. * 17 **===================================================================== 18 */ 19 20 #include <sys/file.h> 21 #include <sys/ioctl.h> 22 #include <sys/socket.h> 23 #include <sys/stat.h> 24 #include <sys/time.h> 25 #include <sys/wait.h> 26 27 #include <netinet/in.h> 28 #include <arpa/inet.h> 29 30 #include <ctype.h> 31 #include <errno.h> 32 #include <netdb.h> 33 #include <pwd.h> 34 #include <signal.h> 35 #include <stdio.h> 36 #include <stdlib.h> 37 #include <string.h> 38 #include <unistd.h> 39 #include <util.h> 40 41 #ifdef ISC_2_0 42 #include <sys/fcntl.h> 43 #endif 44 45 #ifdef SHADOW_SUPPORT 46 #include <shadow.h> 47 #endif 48 49 #ifdef WTMP 50 int wtmp_enabled = 1; 51 #endif 52 53 #include "common.h" 54 #include "pcnfsd.h" 55 #include "extern.h" 56 57 /* 58 **--------------------------------------------------------------------- 59 ** Other #define's 60 **--------------------------------------------------------------------- 61 */ 62 63 #define zchar 0x5b 64 65 char tempstr[256]; 66 67 char *mapfont __P((char, char, char)); 68 void myhandler __P((int)); 69 void start_watchdog __P((int)); 70 void stop_watchdog __P((void)); 71 72 /* 73 **===================================================================== 74 ** C O D E S E C T I O N * 75 **===================================================================== 76 */ 77 /* 78 **--------------------------------------------------------------------- 79 ** Support procedures 80 **--------------------------------------------------------------------- 81 */ 82 83 84 void 85 scramble(s1, s2) 86 char *s1; 87 char *s2; 88 { 89 while (*s1) { 90 *s2++ = (*s1 ^ zchar) & 0x7f; 91 s1++; 92 } 93 *s2 = 0; 94 } 95 96 97 98 struct passwd * 99 get_password(usrnam) 100 char *usrnam; 101 { 102 struct passwd *p; 103 static struct passwd localp; 104 __aconst char *pswd, *ushell; 105 106 107 #ifdef SHADOW_SUPPORT 108 struct spwd *sp; 109 int shadowfile; 110 #endif 111 112 #ifdef SHADOW_SUPPORT 113 /* 114 **-------------------------------------------------------------- 115 ** Check the existence of SHADOW. If it is there, then we are 116 ** running a two-password-file system. 117 **-------------------------------------------------------------- 118 */ 119 if (access(SHADOW, 0)) 120 shadowfile = 0; /* SHADOW is not there */ 121 else 122 shadowfile = 1; 123 124 setpwent(); 125 if (shadowfile) 126 (void) setspent(); /* Setting the shadow password file */ 127 if ((p = getpwnam(usrnam)) == (struct passwd *) NULL || 128 (shadowfile && (sp = getspnam(usrnam)) == (struct spwd *) NULL)) 129 return ((struct passwd *) NULL); 130 131 if (shadowfile) { 132 pswd = sp->sp_pwdp; 133 (void) endspent(); 134 } else 135 pswd = p->pw_passwd; 136 137 #else 138 p = getpwnam(usrnam); 139 if (p == (struct passwd *) NULL) 140 return ((struct passwd *) NULL); 141 pswd = p->pw_passwd; 142 #endif 143 144 #ifdef ISC_2_0 145 /* *----------------------------------------------------------- * We 146 * may have an 'x' in which case look in /etc/shadow .. 147 * *----------------------------------------------------------- */ 148 if (((strlen(pswd)) == 1) && pswd[0] == 'x') { 149 struct spwd *shadow = getspnam(usrnam); 150 151 if (!shadow) 152 return ((struct passwd *) NULL); 153 pswd = shadow->sp_pwdp; 154 } 155 #endif 156 localp = *p; 157 localp.pw_passwd = pswd; 158 #ifdef USE_GETUSERSHELL 159 160 setusershell(); 161 while (ushell = getusershell()) { 162 if (!strcmp(ushell, localp.pw_shell)) { 163 ok = 1; 164 break; 165 } 166 } 167 endusershell(); 168 if (!ok) 169 return ((struct passwd *) NULL); 170 #else 171 /* 172 * the best we can do is to ensure that the shell ends in "sh" 173 */ 174 ushell = localp.pw_shell; 175 if (strlen(ushell) < 2) 176 return ((struct passwd *) NULL); 177 ushell += strlen(ushell) - 2; 178 if (strcmp(ushell, "sh")) 179 return ((struct passwd *) NULL); 180 181 #endif 182 return (&localp); 183 } 184 185 186 187 /* 188 **--------------------------------------------------------------------- 189 ** Print support procedures 190 **--------------------------------------------------------------------- 191 */ 192 193 194 char * 195 mapfont(f, i, b) 196 char f; 197 char i; 198 char b; 199 { 200 static char fontname[64]; 201 202 fontname[0] = 0; /* clear it out */ 203 204 switch (f) { 205 case 'c': 206 (void) strcpy(fontname, "Courier"); 207 break; 208 case 'h': 209 (void) strcpy(fontname, "Helvetica"); 210 break; 211 case 't': 212 (void) strcpy(fontname, "Times"); 213 break; 214 default: 215 (void) strcpy(fontname, "Times-Roman"); 216 goto finis; 217 } 218 if (i != 'o' && b != 'b') { /* no bold or oblique */ 219 if (f == 't') /* special case Times */ 220 (void) strcat(fontname, "-Roman"); 221 goto finis; 222 } 223 (void) strcat(fontname, "-"); 224 if (b == 'b') 225 (void) strcat(fontname, "Bold"); 226 if (i == 'o') /* o-blique */ 227 (void) strcat(fontname, f == 't' ? "Italic" : "Oblique"); 228 229 finis: return (&fontname[0]); 230 } 231 /* 232 * run_ps630 performs the Diablo 630 emulation filtering process. ps630 233 * was broken in certain Sun releases: it would not accept point size or 234 * font changes. If your version is fixed, undefine the symbol 235 * PS630_IS_BROKEN and rebuild pc-nfsd. 236 */ 237 /* #define PS630_IS_BROKEN 1 */ 238 239 void 240 run_ps630(f, opts) 241 char *f; 242 char *opts; 243 { 244 char temp_file[256]; 245 char commbuf[256]; 246 int i; 247 248 (void) strcpy(temp_file, f); 249 (void) strcat(temp_file, "X"); /* intermediate file name */ 250 251 #ifndef PS630_IS_BROKEN 252 (void) sprintf(commbuf, "ps630 -s %c%c -p %s -f ", 253 opts[2], opts[3], temp_file); 254 (void) strcat(commbuf, mapfont(opts[4], opts[5], opts[6])); 255 (void) strcat(commbuf, " -F "); 256 (void) strcat(commbuf, mapfont(opts[7], opts[8], opts[9])); 257 (void) strcat(commbuf, " "); 258 (void) strcat(commbuf, f); 259 #else /* PS630_IS_BROKEN */ 260 /* 261 * The pitch and font features of ps630 appear to be broken at 262 * this time. 263 */ 264 (void) sprintf(commbuf, "ps630 -p %s %s", temp_file, f); 265 #endif /* PS630_IS_BROKEN */ 266 267 268 if ((i = system(commbuf)) != 0) { 269 /* 270 * Under (un)certain conditions, ps630 may return -1 even 271 * if it worked. Hence the commenting out of this error 272 * report. 273 */ 274 /* (void)fprintf(stderr, "\n\nrun_ps630 rc = %d\n", i) */ ; 275 /* exit(1); */ 276 } 277 if (rename(temp_file, f)) { 278 perror("run_ps630: rename"); 279 exit(1); 280 } 281 return; 282 } 283 284 285 286 287 288 /* 289 **--------------------------------------------------------------------- 290 ** WTMP update support 291 **--------------------------------------------------------------------- 292 */ 293 294 295 #ifdef WTMP 296 void 297 wlogin(name, req) 298 char *name; 299 struct svc_req *req; 300 { 301 struct sockaddr_in *who; 302 struct hostent *hp; 303 char *host; 304 305 if (!wtmp_enabled) 306 return; 307 308 /* Get network address of client. */ 309 who = &req->rq_xprt->xp_raddr; 310 311 /* Get name of connected client */ 312 hp = gethostbyaddr((char *) &who->sin_addr, 313 sizeof(struct in_addr), 314 who->sin_family); 315 316 if (hp) { 317 host = hp->h_name; 318 } else { 319 host = inet_ntoa(who->sin_addr); 320 } 321 322 #ifdef SUPPORT_UTMP 323 logwtmp("PC-NFS", name, host); 324 #endif 325 #ifdef SUPPORT_UTMPX 326 logwtmpx("PC-NFS", name, host, 0, USER_PROCESS); 327 #endif 328 } 329 #endif /* WTMP */ 330 331 332 /* 333 **--------------------------------------------------------------------- 334 ** Run-process-as-user procedures 335 **--------------------------------------------------------------------- 336 */ 337 338 339 #define READER_FD 0 340 #define WRITER_FD 1 341 342 static int child_pid; 343 344 static char cached_user[64] = ""; 345 static uid_t cached_uid; 346 static gid_t cached_gid; 347 348 static struct sigaction old_action; 349 static struct sigaction new_action; 350 static struct itimerval timer; 351 352 int interrupted = 0; 353 static FILE *pipe_handle; 354 355 void 356 myhandler(dummy) 357 int dummy; 358 { 359 interrupted = 1; 360 fclose(pipe_handle); 361 kill(child_pid, SIGKILL); 362 msg_out("rpc.pcnfsd: su_popen timeout - killed child process"); 363 } 364 365 void 366 start_watchdog(n) 367 int n; 368 { 369 /* 370 * Setup SIGALRM handler, force interrupt of ongoing syscall 371 */ 372 373 new_action.sa_handler = myhandler; 374 sigemptyset(&(new_action.sa_mask)); 375 new_action.sa_flags = 0; 376 #ifdef SA_INTERRUPT 377 new_action.sa_flags |= SA_INTERRUPT; 378 #endif 379 sigaction(SIGALRM, &new_action, &old_action); 380 381 /* 382 * Set interval timer for n seconds 383 */ 384 timer.it_interval.tv_sec = 0; 385 timer.it_interval.tv_usec = 0; 386 timer.it_value.tv_sec = n; 387 timer.it_value.tv_usec = 0; 388 setitimer(ITIMER_REAL, &timer, NULL); 389 interrupted = 0; 390 391 } 392 393 void 394 stop_watchdog() 395 { 396 /* 397 * Cancel timer 398 */ 399 400 timer.it_interval.tv_sec = 0; 401 timer.it_interval.tv_usec = 0; 402 timer.it_value.tv_sec = 0; 403 timer.it_value.tv_usec = 0; 404 setitimer(ITIMER_REAL, &timer, NULL); 405 406 /* 407 * restore old signal handling 408 */ 409 sigaction(SIGALRM, &old_action, NULL); 410 } 411 412 FILE * 413 su_popen(user, cmd, maxtime) 414 char *user; 415 char *cmd; 416 int maxtime; 417 { 418 int p[2]; 419 int parent_fd, child_fd, pid; 420 struct passwd *pw; 421 422 if (strcmp(cached_user, user)) { 423 pw = getpwnam(user); 424 if (!pw) 425 pw = getpwnam("nobody"); 426 if (pw) { 427 cached_uid = pw->pw_uid; 428 cached_gid = pw->pw_gid; 429 strcpy(cached_user, user); 430 } else { 431 cached_uid = (uid_t) (-2); 432 cached_gid = (gid_t) (-2); 433 cached_user[0] = '\0'; 434 } 435 } 436 if (pipe(p) < 0) { 437 msg_out("rpc.pcnfsd: unable to create pipe in su_popen"); 438 return (NULL); 439 } 440 parent_fd = p[READER_FD]; 441 child_fd = p[WRITER_FD]; 442 if ((pid = fork()) == 0) { 443 int i; 444 445 for (i = 0; i < 10; i++) 446 if (i != child_fd) 447 (void) close(i); 448 if (child_fd != 1) { 449 (void) dup2(child_fd, 1); 450 (void) close(child_fd); 451 } 452 dup2(1, 2); /* let's get stderr as well */ 453 454 (void) setgid(cached_gid); 455 (void) setuid(cached_uid); 456 457 (void) execl("/bin/sh", "sh", "-c", cmd, (char *) NULL); 458 _exit(255); 459 } 460 if (pid == -1) { 461 msg_out("rpc.pcnfsd: fork failed"); 462 close(parent_fd); 463 close(child_fd); 464 return (NULL); 465 } 466 child_pid = pid; 467 close(child_fd); 468 start_watchdog(maxtime); 469 pipe_handle = fdopen(parent_fd, "r"); 470 return (pipe_handle); 471 } 472 473 int 474 su_pclose(ptr) 475 FILE *ptr; 476 { 477 int pid, status; 478 479 stop_watchdog(); 480 481 fclose(ptr); 482 if (child_pid == -1) 483 return (-1); 484 while ((pid = wait(&status)) != child_pid && pid != -1); 485 return (pid == -1 ? -1 : status); 486 } 487 488 489 490 #if XXX_unused 491 /* 492 ** The following routine reads a file "/etc/pcnfsd.conf" if present, 493 ** and uses it to replace certain builtin elements, like the 494 ** name of the print spool directory. The configuration file 495 ** Is the usual kind: Comments begin with '#', blank lines are ignored, 496 ** and valid lines are of the form 497 ** 498 ** <keyword><whitespace><value> 499 ** 500 ** The following keywords are recognized: 501 ** 502 ** spooldir 503 ** printer name alias-for command 504 ** wtmp yes|no 505 */ 506 void 507 config_from_file() 508 { 509 FILE *fd; 510 char buff[1024]; 511 char *cp; 512 char *kw; 513 char *val; 514 char *arg1; 515 char *arg2; 516 517 if ((fd = fopen("/etc/pcnfsd.conf", "r")) == NULL) 518 return; 519 while (fgets(buff, 1024, fd)) { 520 cp = strchr(buff, '\n'); 521 *cp = '\0'; 522 cp = strchr(buff, '#'); 523 if (cp) 524 *cp = '\0'; 525 kw = strtok(buff, " \t"); 526 if (kw == NULL) 527 continue; 528 val = strtok(NULL, " \t"); 529 if (val == NULL) 530 continue; 531 if (!strcasecmp(kw, "spooldir")) { 532 strcpy(sp_name, val); 533 continue; 534 } 535 #ifdef WTMP 536 if (!strcasecmp(kw, "wtmp")) { 537 /* assume default is YES, just look for negatives */ 538 if (!strcasecmp(val, "no") || 539 !strcasecmp(val, "off") || 540 !strcasecmp(val, "disable") || 541 !strcmp(val, "0")) 542 wtmp_enabled = 0;; 543 continue; 544 } 545 #endif 546 if (!strcasecmp(kw, "printer")) { 547 arg1 = strtok(NULL, " \t"); 548 arg2 = strtok(NULL, ""); 549 (void) add_printer_alias(val, arg1, arg2); 550 continue; 551 } 552 /* 553 ** Add new cases here 554 */ 555 } 556 fclose(fd); 557 } 558 #endif /* XXX_unused */ 559 560 561 /* 562 ** strembedded - returns true if s1 is embedded (in any case) in s2 563 */ 564 565 int 566 strembedded(s1, s2) 567 const char *s1; 568 const char *s2; 569 { 570 while (*s2) { 571 if (!strcasecmp(s1, s2)) 572 return 1; 573 s2++; 574 } 575 return 0; 576 } 577