ftpd.c revision 1.90
1 /* $NetBSD: ftpd.c,v 1.90 2000/05/30 05:31:31 itojun Exp $ */ 2 3 /* 4 * Copyright (c) 1997-2000 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Luke Mewburn. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 3. All advertising materials mentioning features or use of this software 19 * must display the following acknowledgement: 20 * This product includes software developed by the NetBSD 21 * Foundation, Inc. and its contributors. 22 * 4. Neither the name of The NetBSD Foundation nor the names of its 23 * contributors may be used to endorse or promote products derived 24 * from this software without specific prior written permission. 25 * 26 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 27 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 28 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 29 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 30 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 31 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 32 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 33 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 34 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 35 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 36 * POSSIBILITY OF SUCH DAMAGE. 37 */ 38 39 /* 40 * Copyright (c) 1985, 1988, 1990, 1992, 1993, 1994 41 * The Regents of the University of California. All rights reserved. 42 * 43 * Redistribution and use in source and binary forms, with or without 44 * modification, are permitted provided that the following conditions 45 * are met: 46 * 1. Redistributions of source code must retain the above copyright 47 * notice, this list of conditions and the following disclaimer. 48 * 2. Redistributions in binary form must reproduce the above copyright 49 * notice, this list of conditions and the following disclaimer in the 50 * documentation and/or other materials provided with the distribution. 51 * 3. All advertising materials mentioning features or use of this software 52 * must display the following acknowledgement: 53 * This product includes software developed by the University of 54 * California, Berkeley and its contributors. 55 * 4. Neither the name of the University nor the names of its contributors 56 * may be used to endorse or promote products derived from this software 57 * without specific prior written permission. 58 * 59 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 60 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 61 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 62 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 63 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 64 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 65 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 66 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 67 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 68 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 69 * SUCH DAMAGE. 70 */ 71 72 /* 73 * Copyright (C) 1997 and 1998 WIDE Project. 74 * All rights reserved. 75 * 76 * Redistribution and use in source and binary forms, with or without 77 * modification, are permitted provided that the following conditions 78 * are met: 79 * 1. Redistributions of source code must retain the above copyright 80 * notice, this list of conditions and the following disclaimer. 81 * 2. Redistributions in binary form must reproduce the above copyright 82 * notice, this list of conditions and the following disclaimer in the 83 * documentation and/or other materials provided with the distribution. 84 * 3. Neither the name of the project nor the names of its contributors 85 * may be used to endorse or promote products derived from this software 86 * without specific prior written permission. 87 * 88 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND 89 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 90 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 91 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE 92 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 93 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 94 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 95 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 96 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 97 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 98 * SUCH DAMAGE. 99 */ 100 101 #include <sys/cdefs.h> 102 #ifndef lint 103 __COPYRIGHT( 104 "@(#) Copyright (c) 1985, 1988, 1990, 1992, 1993, 1994\n\ 105 The Regents of the University of California. All rights reserved.\n"); 106 #endif /* not lint */ 107 108 #ifndef lint 109 #if 0 110 static char sccsid[] = "@(#)ftpd.c 8.5 (Berkeley) 4/28/95"; 111 #else 112 __RCSID("$NetBSD: ftpd.c,v 1.90 2000/05/30 05:31:31 itojun Exp $"); 113 #endif 114 #endif /* not lint */ 115 116 /* 117 * FTP server. 118 */ 119 #include <sys/param.h> 120 #include <sys/stat.h> 121 #include <sys/ioctl.h> 122 #include <sys/socket.h> 123 #include <sys/wait.h> 124 125 #include <netinet/in.h> 126 #include <netinet/in_systm.h> 127 #include <netinet/ip.h> 128 129 #define FTP_NAMES 130 #include <arpa/ftp.h> 131 #include <arpa/inet.h> 132 #include <arpa/telnet.h> 133 134 #include <ctype.h> 135 #include <dirent.h> 136 #include <err.h> 137 #include <errno.h> 138 #include <fcntl.h> 139 #include <fnmatch.h> 140 #include <glob.h> 141 #include <grp.h> 142 #include <limits.h> 143 #include <netdb.h> 144 #include <pwd.h> 145 #include <setjmp.h> 146 #include <signal.h> 147 #include <stdio.h> 148 #include <stdlib.h> 149 #include <string.h> 150 #include <syslog.h> 151 #include <time.h> 152 #include <unistd.h> 153 #include <util.h> 154 #include <utmp.h> 155 #ifdef SKEY 156 #include <skey.h> 157 #endif 158 #ifdef KERBEROS5 159 #include <com_err.h> 160 #include <krb5/krb5.h> 161 #endif 162 163 #define GLOBAL 164 #include "extern.h" 165 #include "pathnames.h" 166 #include "version.h" 167 168 #include <stdarg.h> 169 170 int data; 171 jmp_buf urgcatch; 172 struct passwd *pw; 173 int sflag; 174 int stru; /* avoid C keyword */ 175 int mode; 176 int doutmp = 0; /* update utmp file */ 177 int mapped = 0; /* IPv4 connection on AF_INET6 socket */ 178 off_t file_size; 179 off_t byte_count; 180 static char ttyline[20]; 181 char *tty = ttyline; /* for klogin */ 182 static struct utmp utmp; /* for utmp */ 183 184 static char *anondir = NULL; 185 static char confdir[MAXPATHLEN]; 186 187 #if defined(KERBEROS) || defined(KERBEROS5) 188 int notickets = 1; 189 char *krbtkfile_env = NULL; 190 #endif 191 192 int epsvall = 0; 193 194 /* 195 * Timeout intervals for retrying connections 196 * to hosts that don't accept PORT cmds. This 197 * is a kludge, but given the problems with TCP... 198 */ 199 #define SWAITMAX 90 /* wait at most 90 seconds */ 200 #define SWAITINT 5 /* interval between retries */ 201 202 int swaitmax = SWAITMAX; 203 int swaitint = SWAITINT; 204 205 #define CURCLASSTYPE curclass.type == CLASS_GUEST ? "GUEST" : \ 206 curclass.type == CLASS_CHROOT ? "CHROOT" : \ 207 curclass.type == CLASS_REAL ? "REAL" : \ 208 "<unknown>" 209 210 static void ack(const char *); 211 static int bind_pasv_addr(void); 212 static int checkuser(const char *, const char *, int, int, char **); 213 static int checkaccess(const char *); 214 static FILE *dataconn(const char *, off_t, const char *); 215 static void dolog(struct sockaddr *); 216 static void end_login(void); 217 static FILE *getdatasock(const char *); 218 static char *gunique(const char *); 219 static void lostconn(int); 220 static void myoob(int); 221 static int receive_data(FILE *, FILE *); 222 static void replydirname(const char *, const char *); 223 static int send_data(FILE *, FILE *, off_t, int); 224 static struct passwd *sgetpwnam(const char *); 225 226 int main(int, char *[]); 227 228 #if defined(KERBEROS) || defined(KERBEROS5) 229 int klogin(struct passwd *, char *, char *, char *); 230 void kdestroy(void); 231 #endif 232 233 int 234 main(int argc, char *argv[]) 235 { 236 int addrlen, ch, on = 1, tos, keepalive; 237 #ifdef KERBEROS5 238 krb5_error_code kerror; 239 #endif 240 241 connections = 1; 242 debug = 0; 243 logging = 0; 244 pdata = -1; 245 sflag = 0; 246 usedefault = 1; 247 (void)strcpy(confdir, _DEFAULT_CONFDIR); 248 hostname[0] = '\0'; 249 250 while ((ch = getopt(argc, argv, "a:c:C:dh:lst:T:u:Uv")) != -1) { 251 switch (ch) { 252 case 'a': 253 anondir = optarg; 254 break; 255 256 case 'c': 257 (void)strlcpy(confdir, optarg, sizeof(confdir)); 258 break; 259 260 case 'C': 261 pw = sgetpwnam(optarg); 262 exit(checkaccess(optarg) ? 0 : 1); 263 /* NOTREACHED */ 264 265 case 'd': 266 case 'v': /* deprecated */ 267 debug = 1; 268 break; 269 270 case 'h': 271 strlcpy(hostname, optarg, sizeof(hostname)); 272 break; 273 274 case 'l': 275 logging++; /* > 1 == extra logging */ 276 break; 277 278 case 's': 279 sflag = 1; 280 break; 281 282 case 't': 283 case 'T': 284 case 'u': 285 warnx("-%c has been deprecated in favour of ftpd.conf", 286 ch); 287 break; 288 289 case 'U': 290 doutmp = 1; 291 break; 292 293 default: 294 if (optopt == 'a' || optopt == 'C') 295 exit(1); 296 warnx("unknown flag -%c ignored", optopt); 297 break; 298 } 299 } 300 301 /* 302 * LOG_NDELAY sets up the logging connection immediately, 303 * necessary for anonymous ftp's that chroot and can't do it later. 304 */ 305 openlog("ftpd", LOG_PID | LOG_NDELAY, LOG_FTP); 306 addrlen = sizeof(his_addr); /* xxx */ 307 if (getpeername(0, (struct sockaddr *)&his_addr, &addrlen) < 0) { 308 syslog(LOG_ERR, "getpeername (%s): %m",argv[0]); 309 exit(1); 310 } 311 addrlen = sizeof(ctrl_addr); 312 if (getsockname(0, (struct sockaddr *)&ctrl_addr, &addrlen) < 0) { 313 syslog(LOG_ERR, "getsockname (%s): %m",argv[0]); 314 exit(1); 315 } 316 if (his_addr.su_family == AF_INET6 317 && IN6_IS_ADDR_V4MAPPED(&his_addr.su_sin6.sin6_addr)) { 318 #if 1 319 /* 320 * IPv4 control connection arrived to AF_INET6 socket. 321 * I hate to do this, but this is the easiest solution. 322 * 323 * The assumption is untrue on SIIT environment. 324 */ 325 union sockunion tmp_addr; 326 const int off = sizeof(struct in6_addr) - sizeof(struct in_addr); 327 328 tmp_addr = his_addr; 329 memset(&his_addr, 0, sizeof(his_addr)); 330 his_addr.su_sin.sin_family = AF_INET; 331 his_addr.su_sin.sin_len = sizeof(his_addr.su_sin); 332 memcpy(&his_addr.su_sin.sin_addr, 333 &tmp_addr.su_sin6.sin6_addr.s6_addr[off], 334 sizeof(his_addr.su_sin.sin_addr)); 335 his_addr.su_sin.sin_port = tmp_addr.su_sin6.sin6_port; 336 337 tmp_addr = ctrl_addr; 338 memset(&ctrl_addr, 0, sizeof(ctrl_addr)); 339 ctrl_addr.su_sin.sin_family = AF_INET; 340 ctrl_addr.su_sin.sin_len = sizeof(ctrl_addr.su_sin); 341 memcpy(&ctrl_addr.su_sin.sin_addr, 342 &tmp_addr.su_sin6.sin6_addr.s6_addr[off], 343 sizeof(ctrl_addr.su_sin.sin_addr)); 344 ctrl_addr.su_sin.sin_port = tmp_addr.su_sin6.sin6_port; 345 #else 346 while (fgets(line, sizeof(line), fd) != NULL) { 347 if ((cp = strchr(line, '\n')) != NULL) 348 *cp = '\0'; 349 lreply(530, "%s", line); 350 } 351 (void) fflush(stdout); 352 (void) fclose(fd); 353 reply(530, 354 "Connection from IPv4 mapped address is not supported."); 355 exit(0); 356 #endif 357 358 mapped = 1; 359 } else 360 mapped = 0; 361 #ifdef IP_TOS 362 if (!mapped && his_addr.su_family == AF_INET) { 363 tos = IPTOS_LOWDELAY; 364 if (setsockopt(0, IPPROTO_IP, IP_TOS, (char *)&tos, 365 sizeof(int)) < 0) 366 syslog(LOG_WARNING, "setsockopt (IP_TOS): %m"); 367 } 368 #endif 369 data_source.su_port = htons(ntohs(ctrl_addr.su_port) - 1); 370 371 /* if the hostname hasn't been given, attempt to determine it */ 372 if (hostname[0] == '\0') { 373 if (getnameinfo((struct sockaddr *)&ctrl_addr, ctrl_addr.su_len, 374 hostname, sizeof(hostname), NULL, 0, 0) != 0) 375 (void)gethostname(hostname, sizeof(hostname)); 376 hostname[sizeof(hostname) - 1] = '\0'; 377 } 378 379 /* set this here so klogin can use it... */ 380 (void)snprintf(ttyline, sizeof(ttyline), "ftp%d", getpid()); 381 382 (void) freopen(_PATH_DEVNULL, "w", stderr); 383 (void) signal(SIGPIPE, lostconn); 384 (void) signal(SIGCHLD, SIG_IGN); 385 if (signal(SIGURG, myoob) == SIG_ERR) 386 syslog(LOG_ERR, "signal: %m"); 387 388 /* Try to handle urgent data inline */ 389 #ifdef SO_OOBINLINE 390 if (setsockopt(0, SOL_SOCKET, SO_OOBINLINE, (char *)&on, sizeof(on)) < 0) 391 syslog(LOG_ERR, "setsockopt: %m"); 392 #endif 393 /* Set keepalives on the socket to detect dropped connections. */ 394 #ifdef SO_KEEPALIVE 395 keepalive = 1; 396 if (setsockopt(0, SOL_SOCKET, SO_KEEPALIVE, (char *)&keepalive, 397 sizeof(int)) < 0) 398 syslog(LOG_WARNING, "setsockopt (SO_KEEPALIVE): %m"); 399 #endif 400 401 #ifdef F_SETOWN 402 if (fcntl(fileno(stdin), F_SETOWN, getpid()) == -1) 403 syslog(LOG_ERR, "fcntl F_SETOWN: %m"); 404 #endif 405 dolog((struct sockaddr *)&his_addr); 406 /* 407 * Set up default state 408 */ 409 data = -1; 410 type = TYPE_A; 411 form = FORM_N; 412 stru = STRU_F; 413 mode = MODE_S; 414 tmpline[0] = '\0'; 415 hasyyerrored = 0; 416 417 #ifdef KERBEROS5 418 kerror = krb5_init_context(&kcontext); 419 if (kerror) { 420 syslog(LOG_NOTICE, "%s when initializing Kerberos context", 421 error_message(kerror)); 422 exit(0); 423 } 424 #endif /* KERBEROS5 */ 425 426 init_curclass(); 427 curclass.timeout = 300; /* 5 minutes, as per login(1) */ 428 curclass.type = CLASS_REAL; 429 430 /* If logins are disabled, print out the message. */ 431 if (format_file(_PATH_NOLOGIN, 530)) { 432 reply(530, "System not available."); 433 exit(0); 434 } 435 (void)format_file(conffilename(_PATH_FTPWELCOME), 220); 436 /* reply(220,) must follow */ 437 reply(220, "%s FTP server (%s) ready.", hostname, FTPD_VERSION); 438 439 (void) setjmp(errcatch); 440 for (;;) 441 (void) yyparse(); 442 /* NOTREACHED */ 443 } 444 445 static void 446 lostconn(int signo) 447 { 448 449 if (debug) 450 syslog(LOG_DEBUG, "lost connection"); 451 dologout(1); 452 } 453 454 /* 455 * Save the result of a getpwnam. Used for USER command, since 456 * the data returned must not be clobbered by any other command 457 * (e.g., globbing). 458 */ 459 static struct passwd * 460 sgetpwnam(const char *name) 461 { 462 static struct passwd save; 463 struct passwd *p; 464 465 if ((p = getpwnam(name)) == NULL) 466 return (p); 467 if (save.pw_name) { 468 free((char *)save.pw_name); 469 memset(save.pw_passwd, 0, strlen(save.pw_passwd)); 470 free((char *)save.pw_passwd); 471 free((char *)save.pw_gecos); 472 free((char *)save.pw_dir); 473 free((char *)save.pw_shell); 474 } 475 save = *p; 476 save.pw_name = xstrdup(p->pw_name); 477 save.pw_passwd = xstrdup(p->pw_passwd); 478 save.pw_gecos = xstrdup(p->pw_gecos); 479 save.pw_dir = xstrdup(p->pw_dir); 480 save.pw_shell = xstrdup(p->pw_shell); 481 return (&save); 482 } 483 484 static int login_attempts; /* number of failed login attempts */ 485 static int askpasswd; /* had user command, ask for passwd */ 486 static char curname[10]; /* current USER name */ 487 488 /* 489 * USER command. 490 * Sets global passwd pointer pw if named account exists and is acceptable; 491 * sets askpasswd if a PASS command is expected. If logged in previously, 492 * need to reset state. If name is "ftp" or "anonymous", the name is not in 493 * _PATH_FTPUSERS, and ftp account exists, set guest and pw, then just return. 494 * If account doesn't exist, ask for passwd anyway. Otherwise, check user 495 * requesting login privileges. Disallow anyone who does not have a standard 496 * shell as returned by getusershell(). Disallow anyone mentioned in the file 497 * _PATH_FTPUSERS to allow people such as root and uucp to be avoided. 498 */ 499 void 500 user(const char *name) 501 { 502 if (logged_in) { 503 switch (curclass.type) { 504 case CLASS_GUEST: 505 reply(530, "Can't change user from guest login."); 506 return; 507 case CLASS_CHROOT: 508 reply(530, "Can't change user from chroot user."); 509 return; 510 case CLASS_REAL: 511 end_login(); 512 break; 513 default: 514 abort(); 515 } 516 } 517 518 #if defined(KERBEROS) || defined(KERBEROS5) 519 kdestroy(); 520 #endif 521 522 curclass.type = CLASS_REAL; 523 if (strcmp(name, "ftp") == 0 || strcmp(name, "anonymous") == 0) { 524 /* need `pw' setup for checkaccess() and checkuser () */ 525 if ((pw = sgetpwnam("ftp")) == NULL) 526 reply(530, "User %s unknown.", name); 527 else if (! checkaccess("ftp") || ! checkaccess("anonymous")) 528 reply(530, "User %s access denied.", name); 529 else { 530 curclass.type = CLASS_GUEST; 531 askpasswd = 1; 532 reply(331, 533 "Guest login ok, type your name as password."); 534 } 535 if (!askpasswd && logging) 536 syslog(LOG_NOTICE, 537 "ANONYMOUS FTP LOGIN REFUSED FROM %s", remotehost); 538 return; 539 } 540 541 pw = sgetpwnam(name); 542 if (logging) 543 strlcpy(curname, name, sizeof(curname)); 544 545 #ifdef SKEY 546 if (skey_haskey(name) == 0) { 547 char *myskey; 548 549 myskey = skey_keyinfo(name); 550 reply(331, "Password [%s] required for %s.", 551 myskey ? myskey : "error getting challenge", name); 552 } else 553 #endif 554 reply(331, "Password required for %s.", name); 555 556 askpasswd = 1; 557 /* 558 * Delay before reading passwd after first failed 559 * attempt to slow down passwd-guessing programs. 560 */ 561 if (login_attempts) 562 sleep((unsigned) login_attempts); 563 } 564 565 /* 566 * Determine whether something is to happen (allow access, chroot) 567 * for a user. Each line is a shell-style glob followed by 568 * `yes' or `no'. 569 * 570 * For backward compatability, `allow' and `deny' are synonymns 571 * for `yes' and `no', respectively. 572 * 573 * Each glob is matched against the username in turn, and the first 574 * match found is used. If no match is found, the result is the 575 * argument `def'. If a match is found but without and explicit 576 * `yes'/`no', the result is the opposite of def. 577 * 578 * If the file doesn't exist at all, the result is the argument 579 * `nofile' 580 * 581 * Any line starting with `#' is considered a comment and ignored. 582 * 583 * Returns 0 if the user is denied, or 1 if they are allowed. 584 * 585 * NOTE: needs struct passwd *pw setup before use. 586 */ 587 int 588 checkuser(const char *fname, const char *name, int def, int nofile, 589 char **retclass) 590 { 591 FILE *fd; 592 int retval; 593 char *glob, *perm, *class, *buf, *p; 594 size_t len, line; 595 596 retval = def; 597 if (retclass != NULL) 598 *retclass = NULL; 599 if ((fd = fopen(conffilename(fname), "r")) == NULL) 600 return nofile; 601 602 line = 0; 603 for (; 604 (buf = fparseln(fd, &len, &line, NULL, FPARSELN_UNESCCOMM | 605 FPARSELN_UNESCCONT | FPARSELN_UNESCESC)) != NULL; 606 free(buf), buf = NULL) { 607 glob = perm = class = NULL; 608 p = buf; 609 if (len < 1) 610 continue; 611 if (p[len - 1] == '\n') 612 p[--len] = '\0'; 613 if (EMPTYSTR(p)) 614 continue; 615 616 NEXTWORD(p, glob); 617 NEXTWORD(p, perm); 618 NEXTWORD(p, class); 619 if (EMPTYSTR(glob)) 620 continue; 621 if (!EMPTYSTR(class)) { 622 if (strcasecmp(class, "all") == 0 || 623 strcasecmp(class, "none") == 0) { 624 syslog(LOG_WARNING, 625 "%s line %d: illegal user-defined class `%s' - skipping entry", 626 fname, (int)line, class); 627 continue; 628 } 629 } 630 631 /* have a host specifier */ 632 if ((p = strchr(glob, '@')) != NULL) { 633 u_int32_t net, mask, addr; 634 int bits; 635 636 *p++ = '\0'; 637 /* check against network or CIDR */ 638 if (isdigit(*p) && 639 (bits = inet_net_pton(AF_INET, p, 640 &net, sizeof(net))) != -1) { 641 net = ntohl(net); 642 mask = 0xffffffffU << (32 - bits); 643 addr = ntohl(his_addr.su_sin.sin_addr.s_addr); 644 if ((addr & mask) != net) 645 continue; 646 647 /* check against hostname glob */ 648 } else if (fnmatch(p, remotehost, 0) != 0) 649 continue; 650 } 651 652 /* have a group specifier */ 653 if ((p = strchr(glob, ':')) != NULL) { 654 gid_t *groups, *ng; 655 int gsize, i, found; 656 657 *p++ = '\0'; 658 groups = NULL; 659 gsize = 16; 660 do { 661 ng = realloc(groups, gsize * sizeof(gid_t)); 662 if (ng == NULL) 663 fatal( 664 "Local resource failure: realloc"); 665 groups = ng; 666 } while (getgrouplist(pw->pw_name, pw->pw_gid, 667 groups, &gsize) == -1); 668 found = 0; 669 for (i = 0; i < gsize; i++) { 670 struct group *g; 671 672 if ((g = getgrgid(groups[i])) == NULL) 673 continue; 674 if (fnmatch(p, g->gr_name, 0) == 0) { 675 found = 1; 676 break; 677 } 678 } 679 free(groups); 680 if (!found) 681 continue; 682 } 683 684 /* check against username glob */ 685 if (fnmatch(glob, name, 0) != 0) 686 continue; 687 688 if (perm != NULL && 689 ((strcasecmp(perm, "allow") == 0) || 690 (strcasecmp(perm, "yes") == 0))) 691 retval = 1; 692 else if (perm != NULL && 693 ((strcasecmp(perm, "deny") == 0) || 694 (strcasecmp(perm, "no") == 0))) 695 retval = 0; 696 else 697 retval = !def; 698 if (!EMPTYSTR(class) && retclass != NULL) 699 *retclass = xstrdup(class); 700 free(buf); 701 break; 702 } 703 (void) fclose(fd); 704 return (retval); 705 } 706 707 /* 708 * Check if user is allowed by /etc/ftpusers 709 * returns 1 for yes, 0 for no 710 * 711 * NOTE: needs struct passwd *pw setup (for checkuser()) 712 */ 713 int 714 checkaccess(const char *name) 715 { 716 717 return (checkuser(_PATH_FTPUSERS, name, 1, 0, NULL)); 718 } 719 720 /* 721 * Terminate login as previous user, if any, resetting state; 722 * used when USER command is given or login fails. 723 */ 724 static void 725 end_login(void) 726 { 727 728 (void) seteuid((uid_t)0); 729 if (logged_in) { 730 logwtmp(ttyline, "", ""); 731 if (doutmp) 732 logout(utmp.ut_line); 733 } 734 pw = NULL; 735 logged_in = 0; 736 quietmessages = 0; 737 curclass.type = CLASS_REAL; 738 } 739 740 void 741 pass(const char *passwd) 742 { 743 int rval; 744 const char *cp, *shell, *home; 745 char *class; 746 747 class = NULL; 748 if (logged_in || askpasswd == 0) { 749 reply(503, "Login with USER first."); 750 return; 751 } 752 askpasswd = 0; 753 if (curclass.type != CLASS_GUEST) { 754 /* "ftp" is only account allowed no password */ 755 if (pw == NULL) { 756 rval = 1; /* failure below */ 757 goto skip; 758 } 759 #if defined(KERBEROS) || defined(KERBEROS5) 760 if (klogin(pw, "", hostname, (char *)passwd) == 0) { 761 rval = 0; 762 goto skip; 763 } 764 #endif 765 #ifdef SKEY 766 if (skey_haskey(pw->pw_name) == 0) { 767 char *p; 768 int r; 769 770 p = xstrdup(passwd); 771 r = skey_passcheck(pw->pw_name, p); 772 free(p); 773 if (r != -1) { 774 rval = 0; 775 goto skip; 776 } 777 } 778 #endif 779 if (!sflag && *pw->pw_passwd != '\0' && 780 !strcmp(crypt(passwd, pw->pw_passwd), pw->pw_passwd)) { 781 rval = 0; 782 goto skip; 783 } 784 rval = 1; 785 786 skip: 787 if (pw != NULL && pw->pw_expire && time(NULL) >= pw->pw_expire) 788 rval = 2; 789 /* 790 * If rval > 0, the user failed the authentication check 791 * above. If rval == 0, either Kerberos or local authentication 792 * succeeded. 793 */ 794 if (rval) { 795 reply(530, rval == 2 ? "Password expired." : 796 "Login incorrect."); 797 if (logging) { 798 syslog(LOG_NOTICE, 799 "FTP LOGIN FAILED FROM %s", remotehost); 800 syslog(LOG_AUTHPRIV | LOG_NOTICE, 801 "FTP LOGIN FAILED FROM %s, %s", 802 remotehost, curname); 803 } 804 pw = NULL; 805 if (login_attempts++ >= 5) { 806 syslog(LOG_NOTICE, 807 "repeated login failures from %s", 808 remotehost); 809 exit(0); 810 } 811 return; 812 } 813 } 814 815 /* password was ok; see if anything else prevents login */ 816 if (! checkuser(_PATH_FTPUSERS, pw->pw_name, 1, 0, &class)) { 817 reply(530, "User %s may not use FTP.", pw->pw_name); 818 if (logging) 819 syslog(LOG_NOTICE, "FTP LOGIN REFUSED FROM %s, %s", 820 remotehost, pw->pw_name); 821 goto bad; 822 } 823 /* check for valid shell, if not guest user */ 824 if ((shell = pw->pw_shell) == NULL || *shell == 0) 825 shell = _PATH_BSHELL; 826 while ((cp = getusershell()) != NULL) 827 if (strcmp(cp, shell) == 0) 828 break; 829 endusershell(); 830 if (cp == NULL && curclass.type != CLASS_GUEST) { 831 reply(530, "User %s may not use FTP.", pw->pw_name); 832 if (logging) 833 syslog(LOG_NOTICE, "FTP LOGIN REFUSED FROM %s, %s", 834 remotehost, pw->pw_name); 835 goto bad; 836 } 837 838 login_attempts = 0; /* this time successful */ 839 if (setegid((gid_t)pw->pw_gid) < 0) { 840 reply(550, "Can't set gid."); 841 goto bad; 842 } 843 (void) initgroups(pw->pw_name, pw->pw_gid); 844 845 /* open wtmp before chroot */ 846 logwtmp(ttyline, pw->pw_name, remotehost); 847 848 /* open utmp before chroot */ 849 if (doutmp) { 850 memset((void *)&utmp, 0, sizeof(utmp)); 851 (void)time(&utmp.ut_time); 852 (void)strncpy(utmp.ut_name, pw->pw_name, sizeof(utmp.ut_name)); 853 (void)strncpy(utmp.ut_host, remotehost, sizeof(utmp.ut_host)); 854 (void)strncpy(utmp.ut_line, ttyline, sizeof(utmp.ut_line)); 855 login(&utmp); 856 } 857 858 logged_in = 1; 859 860 /* check user in /etc/ftpchroot */ 861 if (checkuser(_PATH_FTPCHROOT, pw->pw_name, 0, 0, NULL)) { 862 if (curclass.type == CLASS_GUEST) { 863 syslog(LOG_NOTICE, 864 "Can't change guest user to chroot class; remove entry in %s", 865 _PATH_FTPCHROOT); 866 exit(1); 867 } 868 curclass.type = CLASS_CHROOT; 869 } 870 if (class == NULL) { 871 switch (curclass.type) { 872 case CLASS_GUEST: 873 class = xstrdup("guest"); 874 break; 875 case CLASS_CHROOT: 876 class = xstrdup("chroot"); 877 break; 878 case CLASS_REAL: 879 class = xstrdup("real"); 880 break; 881 default: 882 abort(); 883 } 884 } 885 886 /* parse ftpd.conf, setting up various parameters */ 887 parse_conf(class); 888 count_users(); 889 if (curclass.limit != -1 && connections > curclass.limit) { 890 if (! EMPTYSTR(curclass.limitfile)) 891 (void)format_file(conffilename(curclass.limitfile),530); 892 reply(530, 893 "User %s access denied, connection limit of %d reached.", 894 pw->pw_name, curclass.limit); 895 syslog(LOG_NOTICE, 896 "Maximum connection limit of %d for class %s reached, login refused", 897 curclass.limit, curclass.classname); 898 goto bad; 899 } 900 901 home = "/"; 902 switch (curclass.type) { 903 case CLASS_GUEST: 904 /* 905 * We MUST do a chdir() after the chroot. Otherwise 906 * the old current directory will be accessible as "." 907 * outside the new root! 908 */ 909 if (chroot(anondir ? anondir : pw->pw_dir) < 0 || 910 chdir("/") < 0) { 911 reply(550, "Can't set guest privileges."); 912 goto bad; 913 } 914 break; 915 case CLASS_CHROOT: 916 if (chroot(pw->pw_dir) < 0 || chdir("/") < 0) { 917 reply(550, "Can't change root."); 918 goto bad; 919 } 920 break; 921 case CLASS_REAL: 922 if (chdir(pw->pw_dir) < 0) { 923 if (chdir("/") < 0) { 924 reply(530, 925 "User %s: can't change directory to %s.", 926 pw->pw_name, pw->pw_dir); 927 goto bad; 928 } else 929 lreply(230, 930 "No directory! Logging in with home=/"); 931 } else 932 home = pw->pw_dir; 933 break; 934 } 935 if (seteuid((uid_t)pw->pw_uid) < 0) { 936 reply(550, "Can't set uid."); 937 goto bad; 938 } 939 setenv("HOME", home, 1); 940 941 if (curclass.type == CLASS_GUEST && passwd[0] == '-') 942 quietmessages = 1; 943 944 /* 945 * Display a login message, if it exists. 946 * N.B. reply(230,) must follow the message. 947 */ 948 (void)format_file(conffilename(curclass.motd), 230); 949 show_chdir_messages(230); 950 if (curclass.type == CLASS_GUEST) { 951 reply(230, "Guest login ok, access restrictions apply."); 952 #ifdef HASSETPROCTITLE 953 snprintf(proctitle, sizeof(proctitle), 954 "%s: anonymous/%.*s", remotehost, 955 (int) (sizeof(proctitle) - sizeof(remotehost) - 956 sizeof(": anonymous/")), passwd); 957 setproctitle(proctitle); 958 #endif /* HASSETPROCTITLE */ 959 if (logging) 960 syslog(LOG_INFO, 961 "ANONYMOUS FTP LOGIN FROM %s, %s (class: %s, type: %s)", 962 remotehost, passwd, 963 curclass.classname, CURCLASSTYPE); 964 } else { 965 reply(230, "User %s logged in.", pw->pw_name); 966 #ifdef HASSETPROCTITLE 967 snprintf(proctitle, sizeof(proctitle), 968 "%s: %s", remotehost, pw->pw_name); 969 setproctitle(proctitle); 970 #endif /* HASSETPROCTITLE */ 971 if (logging) 972 syslog(LOG_INFO, 973 "FTP LOGIN FROM %s as %s (class: %s, type: %s)", 974 remotehost, pw->pw_name, 975 curclass.classname, CURCLASSTYPE); 976 } 977 (void) umask(curclass.umask); 978 goto cleanuppass; 979 bad: 980 /* Forget all about it... */ 981 end_login(); 982 cleanuppass: 983 if (class) 984 free(class); 985 } 986 987 void 988 retrieve(char *argv[], const char *name) 989 { 990 FILE *fin = NULL, *dout; 991 struct stat st; 992 int (*closefunc)(FILE *) = NULL; 993 int log, sendrv, closerv, stderrfd, isconversion, isdata, isls; 994 struct timeval start, finish, td, *tdp; 995 const char *dispname; 996 997 sendrv = closerv = stderrfd = -1; 998 isconversion = isdata = isls = log = 0; 999 tdp = NULL; 1000 dispname = name; 1001 if (argv == NULL) { 1002 log = 1; 1003 isdata = 1; 1004 fin = fopen(name, "r"); 1005 closefunc = fclose; 1006 if (fin == NULL) 1007 argv = do_conversion(name); 1008 if (argv != NULL) { 1009 isconversion++; 1010 syslog(LOG_INFO, "get command: '%s' on '%s'", 1011 argv[0], name); 1012 } 1013 } 1014 if (argv != NULL) { 1015 char temp[MAXPATHLEN]; 1016 1017 if (strcmp(argv[0], INTERNAL_LS) == 0) { 1018 isls = 1; 1019 stderrfd = -1; 1020 } else { 1021 (void)snprintf(temp, sizeof(temp), "%s", TMPFILE); 1022 stderrfd = mkstemp(temp); 1023 if (stderrfd != -1) 1024 (void)unlink(temp); 1025 } 1026 dispname = argv[0]; 1027 fin = ftpd_popen(argv, "r", stderrfd); 1028 closefunc = ftpd_pclose; 1029 st.st_size = -1; 1030 st.st_blksize = BUFSIZ; 1031 } 1032 if (fin == NULL) { 1033 if (errno != 0) { 1034 perror_reply(550, dispname); 1035 if (log) 1036 logcmd("get", -1, name, NULL, NULL, 1037 strerror(errno)); 1038 } 1039 goto cleanupretrieve; 1040 } 1041 byte_count = -1; 1042 if (argv == NULL 1043 && (fstat(fileno(fin), &st) < 0 || !S_ISREG(st.st_mode))) { 1044 reply(550, "%s: not a plain file.", dispname); 1045 goto done; 1046 } 1047 if (restart_point) { 1048 if (type == TYPE_A) { 1049 off_t i; 1050 int c; 1051 1052 for (i = 0; i < restart_point; i++) { 1053 if ((c=getc(fin)) == EOF) { 1054 perror_reply(550, dispname); 1055 goto done; 1056 } 1057 if (c == '\n') 1058 i++; 1059 } 1060 } else if (lseek(fileno(fin), restart_point, SEEK_SET) < 0) { 1061 perror_reply(550, dispname); 1062 goto done; 1063 } 1064 } 1065 dout = dataconn(dispname, st.st_size, "w"); 1066 if (dout == NULL) 1067 goto done; 1068 1069 (void)gettimeofday(&start, NULL); 1070 sendrv = send_data(fin, dout, st.st_blksize, isdata); 1071 (void)gettimeofday(&finish, NULL); 1072 (void) fclose(dout); 1073 timersub(&finish, &start, &td); 1074 tdp = &td; 1075 data = -1; 1076 done: 1077 if (log) 1078 logcmd("get", byte_count, name, NULL, tdp, NULL); 1079 closerv = (*closefunc)(fin); 1080 if (sendrv == 0) { 1081 FILE *err; 1082 struct stat sb; 1083 1084 if (!isls && argv != NULL && closerv != 0) { 1085 lreply(226, 1086 "Command returned an exit status of %d", 1087 closerv); 1088 if (isconversion) 1089 syslog(LOG_INFO, 1090 "retrieve command: '%s' returned %d", 1091 argv[0], closerv); 1092 } 1093 if (!isls && argv != NULL && stderrfd != -1 && 1094 (fstat(stderrfd, &sb) == 0) && sb.st_size > 0 && 1095 ((err = fdopen(stderrfd, "r")) != NULL)) { 1096 char *cp, line[LINE_MAX]; 1097 1098 lreply(226, "Command error messages:"); 1099 rewind(err); 1100 while (fgets(line, sizeof(line), err) != NULL) { 1101 if ((cp = strchr(line, '\n')) != NULL) 1102 *cp = '\0'; 1103 lreply(0, " %s", line); 1104 } 1105 (void) fflush(stdout); 1106 (void) fclose(err); 1107 /* a reply(226,) must follow */ 1108 } 1109 reply(226, "Transfer complete."); 1110 } 1111 cleanupretrieve: 1112 if (pdata >= 0) 1113 (void)close(pdata); 1114 pdata = -1; 1115 if (stderrfd != -1) 1116 (void)close(stderrfd); 1117 if (isconversion) 1118 free(argv); 1119 } 1120 1121 void 1122 store(const char *name, const char *mode, int unique) 1123 { 1124 FILE *fout, *din; 1125 struct stat st; 1126 int (*closefunc)(FILE *); 1127 struct timeval start, finish, td, *tdp; 1128 char *desc; 1129 1130 desc = (*mode == 'w') ? "put" : "append"; 1131 if (unique && stat(name, &st) == 0 && 1132 (name = gunique(name)) == NULL) { 1133 logcmd(desc, -1, name, NULL, NULL, "cannot create unique file"); 1134 goto cleanupstore; 1135 } 1136 1137 if (restart_point) 1138 mode = "r+"; 1139 fout = fopen(name, mode); 1140 closefunc = fclose; 1141 tdp = NULL; 1142 if (fout == NULL) { 1143 perror_reply(553, name); 1144 logcmd(desc, -1, name, NULL, NULL, strerror(errno)); 1145 goto cleanupstore; 1146 } 1147 byte_count = -1; 1148 if (restart_point) { 1149 if (type == TYPE_A) { 1150 off_t i; 1151 int c; 1152 1153 for (i = 0; i < restart_point; i++) { 1154 if ((c=getc(fout)) == EOF) { 1155 perror_reply(550, name); 1156 goto done; 1157 } 1158 if (c == '\n') 1159 i++; 1160 } 1161 /* 1162 * We must do this seek to "current" position 1163 * because we are changing from reading to 1164 * writing. 1165 */ 1166 if (fseek(fout, 0L, SEEK_CUR) < 0) { 1167 perror_reply(550, name); 1168 goto done; 1169 } 1170 } else if (lseek(fileno(fout), restart_point, SEEK_SET) < 0) { 1171 perror_reply(550, name); 1172 goto done; 1173 } 1174 } 1175 din = dataconn(name, (off_t)-1, "r"); 1176 if (din == NULL) 1177 goto done; 1178 (void)gettimeofday(&start, NULL); 1179 if (receive_data(din, fout) == 0) { 1180 if (unique) 1181 reply(226, "Transfer complete (unique file name:%s).", 1182 name); 1183 else 1184 reply(226, "Transfer complete."); 1185 } 1186 (void)gettimeofday(&finish, NULL); 1187 (void) fclose(din); 1188 timersub(&finish, &start, &td); 1189 tdp = &td; 1190 data = -1; 1191 done: 1192 logcmd(desc, byte_count, name, NULL, tdp, NULL); 1193 (*closefunc)(fout); 1194 cleanupstore: 1195 if (pdata >= 0) 1196 (void)close(pdata); 1197 pdata = -1; 1198 } 1199 1200 static FILE * 1201 getdatasock(const char *mode) 1202 { 1203 int on = 1, s, t, tries; 1204 1205 if (data >= 0) 1206 return (fdopen(data, mode)); 1207 (void) seteuid((uid_t)0); 1208 s = socket(ctrl_addr.su_family, SOCK_STREAM, 0); 1209 if (s < 0) 1210 goto bad; 1211 if (setsockopt(s, SOL_SOCKET, SO_REUSEADDR, 1212 (char *) &on, sizeof(on)) < 0) 1213 goto bad; 1214 if (setsockopt(s, SOL_SOCKET, SO_KEEPALIVE, 1215 (char *) &on, sizeof(on)) < 0) 1216 goto bad; 1217 /* anchor socket to avoid multi-homing problems */ 1218 data_source = ctrl_addr; 1219 data_source.su_port = htons(20); /* ftp-data port */ 1220 for (tries = 1; ; tries++) { 1221 if (bind(s, (struct sockaddr *)&data_source, 1222 data_source.su_len) >= 0) 1223 break; 1224 if (errno != EADDRINUSE || tries > 10) 1225 goto bad; 1226 sleep(tries); 1227 } 1228 (void) seteuid((uid_t)pw->pw_uid); 1229 #ifdef IP_TOS 1230 if (!mapped && ctrl_addr.su_family == AF_INET) { 1231 on = IPTOS_THROUGHPUT; 1232 if (setsockopt(s, IPPROTO_IP, IP_TOS, (char *)&on, 1233 sizeof(int)) < 0) 1234 syslog(LOG_WARNING, "setsockopt (IP_TOS): %m"); 1235 } 1236 #endif 1237 return (fdopen(s, mode)); 1238 bad: 1239 /* Return the real value of errno (close may change it) */ 1240 t = errno; 1241 (void) seteuid((uid_t)pw->pw_uid); 1242 (void) close(s); 1243 errno = t; 1244 return (NULL); 1245 } 1246 1247 static FILE * 1248 dataconn(const char *name, off_t size, const char *mode) 1249 { 1250 char sizebuf[32]; 1251 FILE *file; 1252 int retry = 0, tos, keepalive; 1253 1254 file_size = size; 1255 byte_count = 0; 1256 if (size != (off_t) -1) 1257 (void)snprintf(sizebuf, sizeof(sizebuf), " (%qd byte%s)", 1258 (qdfmt_t)size, PLURAL(size)); 1259 else 1260 sizebuf[0] = '\0'; 1261 if (pdata >= 0) { 1262 union sockunion from; 1263 int s, fromlen = sizeof(from); 1264 1265 (void) alarm(curclass.timeout); 1266 s = accept(pdata, (struct sockaddr *)&from, &fromlen); 1267 (void) alarm(0); 1268 if (s < 0) { 1269 reply(425, "Can't open data connection."); 1270 (void) close(pdata); 1271 pdata = -1; 1272 return (NULL); 1273 } 1274 (void) close(pdata); 1275 pdata = s; 1276 switch (from.su_family) { 1277 case AF_INET: 1278 #ifdef IP_TOS 1279 if (!mapped) { 1280 tos = IPTOS_THROUGHPUT; 1281 (void) setsockopt(s, IPPROTO_IP, IP_TOS, 1282 (char *)&tos, sizeof(int)); 1283 } 1284 break; 1285 #endif 1286 } 1287 /* Set keepalives on the socket to detect dropped conns. */ 1288 #ifdef SO_KEEPALIVE 1289 keepalive = 1; 1290 (void) setsockopt(s, SOL_SOCKET, SO_KEEPALIVE, 1291 (char *)&keepalive, sizeof(int)); 1292 #endif 1293 reply(150, "Opening %s mode data connection for '%s'%s.", 1294 type == TYPE_A ? "ASCII" : "BINARY", name, sizebuf); 1295 return (fdopen(pdata, mode)); 1296 } 1297 if (data >= 0) { 1298 reply(125, "Using existing data connection for '%s'%s.", 1299 name, sizebuf); 1300 usedefault = 1; 1301 return (fdopen(data, mode)); 1302 } 1303 if (usedefault) 1304 data_dest = his_addr; 1305 usedefault = 1; 1306 file = getdatasock(mode); 1307 if (file == NULL) { 1308 char hbuf[INET6_ADDRSTRLEN]; 1309 char pbuf[10]; 1310 getnameinfo((struct sockaddr *)&data_source, data_source.su_len, 1311 hbuf, sizeof(hbuf), pbuf, sizeof(pbuf), 1312 NI_NUMERICHOST | NI_NUMERICSERV); 1313 reply(425, "Can't create data socket (%s,%s): %s.", 1314 hbuf, pbuf, strerror(errno)); 1315 return (NULL); 1316 } 1317 data = fileno(file); 1318 while (connect(data, (struct sockaddr *)&data_dest, 1319 data_dest.su_len) < 0) { 1320 if (errno == EADDRINUSE && retry < swaitmax) { 1321 sleep((unsigned) swaitint); 1322 retry += swaitint; 1323 continue; 1324 } 1325 perror_reply(425, "Can't build data connection"); 1326 (void) fclose(file); 1327 data = -1; 1328 return (NULL); 1329 } 1330 reply(150, "Opening %s mode data connection for '%s'%s.", 1331 type == TYPE_A ? "ASCII" : "BINARY", name, sizebuf); 1332 return (file); 1333 } 1334 1335 /* 1336 * Tranfer the contents of "instr" to "outstr" peer using the appropriate 1337 * encapsulation of the data subject * to Mode, Structure, and Type. 1338 * 1339 * NB: Form isn't handled. 1340 */ 1341 static int 1342 send_data(FILE *instr, FILE *outstr, off_t blksize, int isdata) 1343 { 1344 int c, filefd, netfd, rval; 1345 char *buf; 1346 1347 transflag = 1; 1348 rval = -1; 1349 buf = NULL; 1350 if (setjmp(urgcatch)) 1351 goto cleanup_send_data; 1352 1353 switch (type) { 1354 1355 case TYPE_A: 1356 /* XXXX: rate limit ascii send (get) */ 1357 (void) alarm(curclass.timeout); 1358 while ((c = getc(instr)) != EOF) { 1359 byte_count++; 1360 if (c == '\n') { 1361 if (ferror(outstr)) 1362 goto data_err; 1363 (void) putc('\r', outstr); 1364 if (isdata) { 1365 total_data_out++; 1366 total_data++; 1367 } 1368 total_bytes_out++; 1369 total_bytes++; 1370 } 1371 (void) putc(c, outstr); 1372 if (isdata) { 1373 total_data_out++; 1374 total_data++; 1375 } 1376 total_bytes_out++; 1377 total_bytes++; 1378 if ((byte_count % 4096) == 0) 1379 (void) alarm(curclass.timeout); 1380 } 1381 (void) alarm(0); 1382 fflush(outstr); 1383 if (ferror(instr)) 1384 goto file_err; 1385 if (ferror(outstr)) 1386 goto data_err; 1387 rval = 0; 1388 goto cleanup_send_data; 1389 1390 case TYPE_I: 1391 case TYPE_L: 1392 if ((buf = malloc((size_t)blksize)) == NULL) { 1393 perror_reply(451, "Local resource failure: malloc"); 1394 goto cleanup_send_data; 1395 } 1396 filefd = fileno(instr); 1397 netfd = fileno(outstr); 1398 (void) alarm(curclass.timeout); 1399 if (curclass.rateget) { 1400 while (1) { 1401 int d; 1402 struct timeval then, now, td; 1403 off_t bufrem; 1404 char *bufp; 1405 1406 (void)gettimeofday(&then, NULL); 1407 errno = c = d = 0; 1408 bufrem = curclass.rateget; 1409 while (bufrem > 0) { 1410 if ((c = read(filefd, buf, 1411 MIN(blksize, bufrem))) <= 0) 1412 goto senddone; 1413 (void) alarm(curclass.timeout); 1414 bufrem -= c; 1415 byte_count += c; 1416 if (isdata) { 1417 total_data_out += c; 1418 total_data += c; 1419 } 1420 total_bytes_out += c; 1421 total_bytes += c; 1422 for (bufp = buf; c > 0; 1423 c -= d, bufp += d) 1424 if ((d = 1425 write(netfd, bufp, c)) <= 0) 1426 break; 1427 if (d < 0) 1428 goto data_err; 1429 } 1430 (void)gettimeofday(&now, NULL); 1431 timersub(&now, &then, &td); 1432 if (td.tv_sec > 0) 1433 break; 1434 usleep(1000000 - td.tv_usec); 1435 } 1436 } else { 1437 while ((c = read(filefd, buf, (size_t)blksize)) > 0) { 1438 if (write(netfd, buf, c) != c) 1439 goto data_err; 1440 (void) alarm(curclass.timeout); 1441 byte_count += c; 1442 if (isdata) { 1443 total_data_out += c; 1444 total_data += c; 1445 } 1446 total_bytes_out += c; 1447 total_bytes += c; 1448 } 1449 } 1450 senddone: 1451 if (c < 0) 1452 goto file_err; 1453 rval = 0; 1454 goto cleanup_send_data; 1455 1456 default: 1457 reply(550, "Unimplemented TYPE %d in send_data", type); 1458 goto cleanup_send_data; 1459 } 1460 1461 data_err: 1462 (void) alarm(0); 1463 perror_reply(426, "Data connection"); 1464 goto cleanup_send_data; 1465 1466 file_err: 1467 (void) alarm(0); 1468 perror_reply(551, "Error on input file"); 1469 /* FALLTHROUGH */ 1470 1471 cleanup_send_data: 1472 (void) alarm(0); 1473 transflag = 0; 1474 if (buf) 1475 free(buf); 1476 if (isdata) { 1477 total_files_out++; 1478 total_files++; 1479 } 1480 total_xfers_out++; 1481 total_xfers++; 1482 return (rval); 1483 } 1484 1485 /* 1486 * Transfer data from peer to "outstr" using the appropriate encapulation of 1487 * the data subject to Mode, Structure, and Type. 1488 * 1489 * N.B.: Form isn't handled. 1490 */ 1491 static int 1492 receive_data(FILE *instr, FILE *outstr) 1493 { 1494 int c, bare_lfs, netfd, filefd, rval; 1495 char buf[BUFSIZ]; 1496 #ifdef __GNUC__ 1497 (void) &bare_lfs; 1498 #endif 1499 1500 bare_lfs = 0; 1501 transflag = 1; 1502 rval = -1; 1503 if (setjmp(urgcatch)) 1504 goto cleanup_recv_data; 1505 1506 switch (type) { 1507 1508 case TYPE_I: 1509 case TYPE_L: 1510 netfd = fileno(instr); 1511 filefd = fileno(outstr); 1512 (void) alarm(curclass.timeout); 1513 if (curclass.rateput) { 1514 while (1) { 1515 int d; 1516 struct timeval then, now, td; 1517 off_t bufrem; 1518 1519 (void)gettimeofday(&then, NULL); 1520 errno = c = d = 0; 1521 for (bufrem = curclass.rateput; bufrem > 0; ) { 1522 if ((c = read(netfd, buf, 1523 MIN(sizeof(buf), bufrem))) <= 0) 1524 goto recvdone; 1525 if ((d = write(filefd, buf, c)) != c) 1526 goto recvdone; 1527 (void) alarm(curclass.timeout); 1528 bufrem -= c; 1529 byte_count += c; 1530 total_data_in += c; 1531 total_data += c; 1532 total_bytes_in += c; 1533 total_bytes += c; 1534 } 1535 (void)gettimeofday(&now, NULL); 1536 timersub(&now, &then, &td); 1537 if (td.tv_sec > 0) 1538 break; 1539 usleep(1000000 - td.tv_usec); 1540 } 1541 } else { 1542 while ((c = read(netfd, buf, sizeof(buf))) > 0) { 1543 if (write(filefd, buf, c) != c) 1544 goto file_err; 1545 (void) alarm(curclass.timeout); 1546 byte_count += c; 1547 total_data_in += c; 1548 total_data += c; 1549 total_bytes_in += c; 1550 total_bytes += c; 1551 } 1552 } 1553 recvdone: 1554 if (c < 0) 1555 goto data_err; 1556 rval = 0; 1557 goto cleanup_recv_data; 1558 1559 case TYPE_E: 1560 reply(553, "TYPE E not implemented."); 1561 goto cleanup_recv_data; 1562 1563 case TYPE_A: 1564 (void) alarm(curclass.timeout); 1565 /* XXXX: rate limit ascii receive (put) */ 1566 while ((c = getc(instr)) != EOF) { 1567 byte_count++; 1568 total_data_in++; 1569 total_data++; 1570 total_bytes_in++; 1571 total_bytes++; 1572 if ((byte_count % 4096) == 0) 1573 (void) alarm(curclass.timeout); 1574 if (c == '\n') 1575 bare_lfs++; 1576 while (c == '\r') { 1577 if (ferror(outstr)) 1578 goto data_err; 1579 if ((c = getc(instr)) != '\n') { 1580 byte_count++; 1581 total_data_in++; 1582 total_data++; 1583 total_bytes_in++; 1584 total_bytes++; 1585 if ((byte_count % 4096) == 0) 1586 (void) alarm(curclass.timeout); 1587 (void) putc ('\r', outstr); 1588 if (c == '\0' || c == EOF) 1589 goto contin2; 1590 } 1591 } 1592 (void) putc(c, outstr); 1593 contin2: ; 1594 } 1595 (void) alarm(0); 1596 fflush(outstr); 1597 if (ferror(instr)) 1598 goto data_err; 1599 if (ferror(outstr)) 1600 goto file_err; 1601 if (bare_lfs) { 1602 lreply(226, 1603 "WARNING! %d bare linefeeds received in ASCII mode", 1604 bare_lfs); 1605 lreply(0, "File may not have transferred correctly."); 1606 } 1607 rval = 0; 1608 goto cleanup_recv_data; 1609 1610 default: 1611 reply(550, "Unimplemented TYPE %d in receive_data", type); 1612 goto cleanup_recv_data; 1613 } 1614 1615 data_err: 1616 (void) alarm(0); 1617 perror_reply(426, "Data Connection"); 1618 goto cleanup_recv_data; 1619 1620 file_err: 1621 (void) alarm(0); 1622 perror_reply(452, "Error writing file"); 1623 goto cleanup_recv_data; 1624 1625 cleanup_recv_data: 1626 (void) alarm(0); 1627 transflag = 0; 1628 total_files_in++; 1629 total_files++; 1630 total_xfers_in++; 1631 total_xfers++; 1632 return (rval); 1633 } 1634 1635 void 1636 statfilecmd(const char *filename) 1637 { 1638 FILE *fin; 1639 int c; 1640 char *argv[] = { INTERNAL_LS, "-lgA", "", NULL }; 1641 1642 argv[2] = (char *)filename; 1643 fin = ftpd_popen(argv, "r", STDOUT_FILENO); 1644 lreply(211, "status of %s:", filename); 1645 while ((c = getc(fin)) != EOF) { 1646 if (c == '\n') { 1647 if (ferror(stdout)){ 1648 perror_reply(421, "control connection"); 1649 (void) ftpd_pclose(fin); 1650 dologout(1); 1651 /* NOTREACHED */ 1652 } 1653 if (ferror(fin)) { 1654 perror_reply(551, filename); 1655 (void) ftpd_pclose(fin); 1656 return; 1657 } 1658 (void) putchar('\r'); 1659 total_bytes++; 1660 total_bytes_out++; 1661 } 1662 (void) putchar(c); 1663 total_bytes++; 1664 total_bytes_out++; 1665 } 1666 (void) ftpd_pclose(fin); 1667 reply(211, "End of Status"); 1668 } 1669 1670 void 1671 statcmd(void) 1672 { 1673 union sockunion *su = NULL; 1674 static char ntop_buf[INET6_ADDRSTRLEN]; 1675 u_char *a, *p; 1676 int ispassive, af; 1677 off_t b, otbi, otbo, otb; 1678 1679 a = p = (u_char *)NULL; 1680 1681 lreply(211, "%s FTP server status:", hostname); 1682 lreply(0, "Version: %s", FTPD_VERSION); 1683 ntop_buf[0] = '\0'; 1684 if (!getnameinfo((struct sockaddr *)&his_addr, his_addr.su_len, 1685 ntop_buf, sizeof(ntop_buf), NULL, 0, NI_NUMERICHOST) 1686 && strcmp(remotehost, ntop_buf) != 0) { 1687 lreply(0, "Connected to %s (%s)", remotehost, ntop_buf); 1688 } else 1689 lreply(0, "Connected to %s", remotehost); 1690 if (logged_in) { 1691 if (curclass.type == CLASS_GUEST) 1692 lreply(0, "Logged in anonymously"); 1693 else 1694 lreply(0, "Logged in as %s%s", pw->pw_name, 1695 curclass.type == CLASS_CHROOT ? " (chroot)" : ""); 1696 } else if (askpasswd) 1697 lreply(0, "Waiting for password"); 1698 else 1699 lreply(0, "Waiting for user name"); 1700 b = printf(" TYPE: %s", typenames[type]); 1701 total_bytes += b; 1702 total_bytes_out += b; 1703 if (type == TYPE_A || type == TYPE_E) { 1704 b = printf(", FORM: %s", formnames[form]); 1705 total_bytes += b; 1706 total_bytes_out += b; 1707 } 1708 if (type == TYPE_L) { 1709 #if NBBY == 8 1710 b = printf(" %d", NBBY); 1711 #else 1712 /* XXX: `bytesize' needs to be defined in this case */ 1713 b = printf(" %d", bytesize); 1714 #endif 1715 total_bytes += b; 1716 total_bytes_out += b; 1717 } 1718 b = printf("; STRUcture: %s; transfer MODE: %s\r\n", 1719 strunames[stru], modenames[mode]); 1720 total_bytes += b; 1721 total_bytes_out += b; 1722 ispassive = 0; 1723 if (data != -1) { 1724 lreply(0, "Data connection open"); 1725 su = NULL; 1726 } else if (pdata != -1) { 1727 b = printf(" in Passive mode"); 1728 total_bytes += b; 1729 total_bytes_out += b; 1730 su = (union sockunion *)&pasv_addr; 1731 ispassive = 1; 1732 goto printaddr; 1733 } else if (usedefault == 0) { 1734 if (epsvall) { 1735 b = printf("211- EPSV only mode (EPSV ALL )\r\n"); 1736 total_bytes += b; 1737 total_bytes_out += b; 1738 goto epsvonly; 1739 } 1740 b = printf("211- %s", 1741 (data_dest.su_family == AF_INET) ? "PORT" : "LPRT"); 1742 total_bytes += b; 1743 total_bytes_out += b; 1744 su = (union sockunion *)&data_dest; 1745 printaddr: 1746 /* PASV/PORT */ 1747 if (su->su_family == AF_INET) { 1748 if (ispassive) 1749 b = printf("211- PASV "); 1750 else 1751 b = printf("211- PORT "); 1752 a = (u_char *) &su->su_sin.sin_addr; 1753 p = (u_char *) &su->su_sin.sin_port; 1754 #define UC(b) (((int) b) & 0xff) 1755 b += printf("(%d,%d,%d,%d,%d,%d)\r\n", 1756 UC(a[0]), UC(a[1]), UC(a[2]), UC(a[3]), 1757 UC(p[0]), UC(p[1])); 1758 total_bytes += b; 1759 total_bytes_out += b; 1760 } 1761 1762 /* LPSV/LPRT */ 1763 { 1764 int alen, af, i; 1765 1766 alen = 0; 1767 switch (su->su_family) { 1768 case AF_INET: 1769 a = (u_char *) &su->su_sin.sin_addr; 1770 p = (u_char *) &su->su_sin.sin_port; 1771 alen = sizeof(su->su_sin.sin_addr); 1772 af = 4; 1773 break; 1774 case AF_INET6: 1775 a = (u_char *) &su->su_sin6.sin6_addr; 1776 p = (u_char *) &su->su_sin6.sin6_port; 1777 alen = sizeof(su->su_sin6.sin6_addr); 1778 af = 6; 1779 break; 1780 default: 1781 af = 0; 1782 break; 1783 } 1784 if (af) { 1785 if (ispassive) 1786 b = printf("211- LPSV "); 1787 else 1788 b = printf("211- LPRT "); 1789 printf("(%d,%d", af, alen); 1790 for (i = 0; i < alen; i++) 1791 b += printf("%d,", UC(a[alen])); 1792 b += printf("%d,%d,%d)\r\n", 2, UC(p[0]), UC(p[1])); 1793 total_bytes += b; 1794 total_bytes_out += b; 1795 #undef UC 1796 } 1797 } 1798 1799 /* EPRT/EPSV */ 1800 epsvonly: 1801 switch (su->su_family) { 1802 case AF_INET: 1803 af = 1; 1804 break; 1805 case AF_INET6: 1806 af = 2; 1807 break; 1808 default: 1809 af = 0; 1810 break; 1811 } 1812 if (af) { 1813 if (getnameinfo((struct sockaddr *)su, su->su_len, 1814 ntop_buf, sizeof(ntop_buf), NULL, 0, 1815 NI_NUMERICHOST) == 0) { 1816 if (ispassive) 1817 b = printf("211 - EPSV "); 1818 else 1819 b = printf("211 - EPRT "); 1820 b += printf("(|%d|%s|%d|)\r\n", 1821 af, ntop_buf, ntohs(su->su_port)); 1822 total_bytes += b; 1823 total_bytes_out += b; 1824 } 1825 } 1826 } else 1827 lreply(0, "No data connection"); 1828 1829 if (logged_in) { 1830 lreply(0, "Data sent: %qd byte%s in %qd file%s", 1831 (qdfmt_t)total_data_out, PLURAL(total_data_out), 1832 (qdfmt_t)total_files_out, PLURAL(total_files_out)); 1833 lreply(0, "Data received: %qd byte%s in %qd file%s", 1834 (qdfmt_t)total_data_in, PLURAL(total_data_in), 1835 (qdfmt_t)total_files_in, PLURAL(total_files_in)); 1836 lreply(0, "Total data: %qd byte%s in %qd file%s", 1837 (qdfmt_t)total_data, PLURAL(total_data), 1838 (qdfmt_t)total_files, PLURAL(total_files)); 1839 } 1840 otbi = total_bytes_in; 1841 otbo = total_bytes_out; 1842 otb = total_bytes; 1843 lreply(0, "Traffic sent: %qd byte%s in %qd transfer%s", 1844 (qdfmt_t)otbo, PLURAL(otbo), 1845 (qdfmt_t)total_xfers_out, PLURAL(total_xfers_out)); 1846 lreply(0, "Traffic received: %qd byte%s in %qd transfer%s", 1847 (qdfmt_t)otbi, PLURAL(otbi), 1848 (qdfmt_t)total_xfers_in, PLURAL(total_xfers_in)); 1849 lreply(0, "Total traffic: %qd byte%s in %qd transfer%s", 1850 (qdfmt_t)otb, PLURAL(otb), 1851 (qdfmt_t)total_xfers, PLURAL(total_xfers)); 1852 1853 if (logged_in) { 1854 struct ftpconv *cp; 1855 1856 lreply(0, ""); 1857 lreply(0, "Class: %s, type: %s", 1858 curclass.classname, CURCLASSTYPE); 1859 lreply(0, "Check PORT/LPRT commands: %sabled", 1860 curclass.checkportcmd ? "en" : "dis"); 1861 if (curclass.display != NULL) 1862 lreply(0, "Display file: %s", curclass.display); 1863 if (curclass.notify != NULL) 1864 lreply(0, "Notify fileglob: %s", curclass.notify); 1865 lreply(0, "Idle timeout: %d, maximum timeout: %d", 1866 curclass.timeout, curclass.maxtimeout); 1867 lreply(0, "Current connections: %d", connections); 1868 if (curclass.limit == -1) 1869 lreply(0, "Maximum connections: unlimited"); 1870 else 1871 lreply(0, "Maximum connections: %d", curclass.limit); 1872 if (curclass.limitfile) 1873 lreply(0, "Connection limit exceeded file: %s", 1874 curclass.limitfile); 1875 if (curclass.motd != NULL) 1876 lreply(0, "MotD file: %s", curclass.motd); 1877 lreply(0, 1878 "Modify commands (CHMOD, DELE, MKD, RMD, RNFR, UMASK): %sabled", 1879 curclass.modify ? "en" : "dis"); 1880 lreply(0, 1881 "Upload commands (APPE, STOR, STOU): %sabled", 1882 curclass.upload ? "en" : "dis"); 1883 if (curclass.portmin && curclass.portmax) 1884 lreply(0, "PASV port range: %d - %d", 1885 curclass.portmin, curclass.portmax); 1886 if (curclass.rateget) 1887 lreply(0, "Rate get limit: %d bytes/sec", 1888 curclass.rateget); 1889 else 1890 lreply(0, "Rate get limit: disabled"); 1891 if (curclass.rateput) 1892 lreply(0, "Rate put limit: %d bytes/sec", 1893 curclass.rateput); 1894 else 1895 lreply(0, "Rate put limit: disabled"); 1896 lreply(0, "Umask: %.04o", curclass.umask); 1897 for (cp = curclass.conversions; cp != NULL; cp=cp->next) { 1898 if (cp->suffix == NULL || cp->types == NULL || 1899 cp->command == NULL) 1900 continue; 1901 lreply(0, 1902 "Conversion: %s [%s] disable: %s, command: %s", 1903 cp->suffix, cp->types, cp->disable, cp->command); 1904 } 1905 } 1906 1907 reply(211, "End of status"); 1908 } 1909 1910 void 1911 fatal(const char *s) 1912 { 1913 1914 reply(451, "Error in server: %s\n", s); 1915 reply(221, "Closing connection due to server error."); 1916 dologout(0); 1917 /* NOTREACHED */ 1918 } 1919 1920 void 1921 reply(int n, const char *fmt, ...) 1922 { 1923 off_t b; 1924 va_list ap; 1925 1926 va_start(ap, fmt); 1927 b = 0; 1928 b += printf("%d ", n); 1929 b += vprintf(fmt, ap); 1930 b += printf("\r\n"); 1931 total_bytes += b; 1932 total_bytes_out += b; 1933 (void)fflush(stdout); 1934 if (debug) { 1935 syslog(LOG_DEBUG, "<--- %d ", n); 1936 vsyslog(LOG_DEBUG, fmt, ap); 1937 } 1938 } 1939 1940 void 1941 lreply(int n, const char *fmt, ...) 1942 { 1943 off_t b; 1944 va_list ap; 1945 1946 va_start(ap, fmt); 1947 b = 0; 1948 switch (n) { 1949 case 0: 1950 b += printf(" "); 1951 case -1: 1952 break; 1953 default: 1954 b += printf("%d-", n); 1955 break; 1956 } 1957 b += vprintf(fmt, ap); 1958 b += printf("\r\n"); 1959 total_bytes += b; 1960 total_bytes_out += b; 1961 (void)fflush(stdout); 1962 if (debug) { 1963 syslog(LOG_DEBUG, "<--- %d- ", n); 1964 vsyslog(LOG_DEBUG, fmt, ap); 1965 } 1966 } 1967 1968 static void 1969 ack(const char *s) 1970 { 1971 1972 reply(250, "%s command successful.", s); 1973 } 1974 1975 void 1976 delete(const char *name) 1977 { 1978 char *p = NULL; 1979 1980 if (remove(name) < 0) { 1981 p = strerror(errno); 1982 perror_reply(550, name); 1983 } else 1984 ack("DELE"); 1985 logcmd("delete", -1, name, NULL, NULL, p); 1986 } 1987 1988 void 1989 cwd(const char *path) 1990 { 1991 1992 if (chdir(path) < 0) 1993 perror_reply(550, path); 1994 else { 1995 show_chdir_messages(250); 1996 ack("CWD"); 1997 } 1998 } 1999 2000 static void 2001 replydirname(const char *name, const char *message) 2002 { 2003 char npath[MAXPATHLEN]; 2004 int i; 2005 2006 for (i = 0; *name != '\0' && i < sizeof(npath) - 1; i++, name++) { 2007 npath[i] = *name; 2008 if (*name == '"') 2009 npath[++i] = '"'; 2010 } 2011 npath[i] = '\0'; 2012 reply(257, "\"%s\" %s", npath, message); 2013 } 2014 2015 void 2016 makedir(const char *name) 2017 { 2018 char *p = NULL; 2019 2020 if (mkdir(name, 0777) < 0) { 2021 p = strerror(errno); 2022 perror_reply(550, name); 2023 } else 2024 replydirname(name, "directory created."); 2025 logcmd("mkdir", -1, name, NULL, NULL, p); 2026 } 2027 2028 void 2029 removedir(const char *name) 2030 { 2031 char *p = NULL; 2032 2033 if (rmdir(name) < 0) { 2034 p = strerror(errno); 2035 perror_reply(550, name); 2036 } else 2037 ack("RMD"); 2038 logcmd("rmdir", -1, name, NULL, NULL, p); 2039 } 2040 2041 void 2042 pwd(void) 2043 { 2044 char path[MAXPATHLEN]; 2045 2046 if (getcwd(path, sizeof(path) - 1) == NULL) 2047 reply(550, "Can't get the current directory: %s.", 2048 strerror(errno)); 2049 else 2050 replydirname(path, "is the current directory."); 2051 } 2052 2053 char * 2054 renamefrom(const char *name) 2055 { 2056 struct stat st; 2057 2058 if (stat(name, &st) < 0) { 2059 perror_reply(550, name); 2060 return (NULL); 2061 } 2062 reply(350, "File exists, ready for destination name"); 2063 return (xstrdup(name)); 2064 } 2065 2066 void 2067 renamecmd(const char *from, const char *to) 2068 { 2069 char *p = NULL; 2070 2071 if (rename(from, to) < 0) { 2072 p = strerror(errno); 2073 perror_reply(550, "rename"); 2074 } else 2075 ack("RNTO"); 2076 logcmd("rename", -1, from, to, NULL, p); 2077 } 2078 2079 static void 2080 dolog(struct sockaddr *who) 2081 { 2082 getnameinfo(who, who->sa_len, remotehost, sizeof(remotehost), NULL,0,0); 2083 #ifdef HASSETPROCTITLE 2084 snprintf(proctitle, sizeof(proctitle), "%s: connected", remotehost); 2085 setproctitle(proctitle); 2086 #endif /* HASSETPROCTITLE */ 2087 if (logging) 2088 syslog(LOG_INFO, "connection from %s to %s", 2089 remotehost, hostname); 2090 } 2091 2092 /* 2093 * Record logout in wtmp file 2094 * and exit with supplied status. 2095 */ 2096 void 2097 dologout(int status) 2098 { 2099 /* 2100 * Prevent reception of SIGURG from resulting in a resumption 2101 * back to the main program loop. 2102 */ 2103 transflag = 0; 2104 2105 if (logged_in) { 2106 (void) seteuid((uid_t)0); 2107 logwtmp(ttyline, "", ""); 2108 if (doutmp) 2109 logout(utmp.ut_line); 2110 #ifdef KERBEROS 2111 if (!notickets && krbtkfile_env) 2112 unlink(krbtkfile_env); 2113 #endif 2114 } 2115 /* beware of flushing buffers after a SIGPIPE */ 2116 _exit(status); 2117 } 2118 2119 static void 2120 myoob(int signo) 2121 { 2122 char *cp; 2123 2124 /* only process if transfer occurring */ 2125 if (!transflag) 2126 return; 2127 cp = tmpline; 2128 if (getline(cp, 7, stdin) == NULL) { 2129 reply(221, "You could at least say goodbye."); 2130 dologout(0); 2131 } 2132 if (strcasecmp(cp, "ABOR\r\n") == 0) { 2133 tmpline[0] = '\0'; 2134 reply(426, "Transfer aborted. Data connection closed."); 2135 reply(226, "Abort successful"); 2136 longjmp(urgcatch, 1); 2137 } 2138 if (strcasecmp(cp, "STAT\r\n") == 0) { 2139 tmpline[0] = '\0'; 2140 if (file_size != (off_t) -1) 2141 reply(213, "Status: %qd of %qd byte%s transferred", 2142 (qdfmt_t)byte_count, (qdfmt_t)file_size, 2143 PLURAL(byte_count)); 2144 else 2145 reply(213, "Status: %qd byte%s transferred", 2146 (qdfmt_t)byte_count, PLURAL(byte_count)); 2147 } 2148 } 2149 2150 static int 2151 bind_pasv_addr(void) 2152 { 2153 static int passiveport; 2154 int port, len; 2155 2156 len = pasv_addr.su_len; 2157 if (curclass.portmin == 0 && curclass.portmax == 0) { 2158 pasv_addr.su_port = 0; 2159 return (bind(pdata, (struct sockaddr *)&pasv_addr, len)); 2160 } 2161 2162 if (passiveport == 0) { 2163 srand(getpid()); 2164 passiveport = rand() % (curclass.portmax - curclass.portmin) 2165 + curclass.portmin; 2166 } 2167 2168 port = passiveport; 2169 while (1) { 2170 port++; 2171 if (port > curclass.portmax) 2172 port = curclass.portmin; 2173 else if (port == passiveport) { 2174 errno = EAGAIN; 2175 return (-1); 2176 } 2177 pasv_addr.su_port = htons(port); 2178 if (bind(pdata, (struct sockaddr *)&pasv_addr, len) == 0) 2179 break; 2180 if (errno != EADDRINUSE) 2181 return (-1); 2182 } 2183 passiveport = port; 2184 return (0); 2185 } 2186 2187 /* 2188 * Note: a response of 425 is not mentioned as a possible response to 2189 * the PASV command in RFC959. However, it has been blessed as 2190 * a legitimate response by Jon Postel in a telephone conversation 2191 * with Rick Adams on 25 Jan 89. 2192 */ 2193 void 2194 passive(void) 2195 { 2196 int len; 2197 char *p, *a; 2198 2199 if (pdata >= 0) 2200 close(pdata); 2201 pdata = socket(AF_INET, SOCK_STREAM, 0); 2202 if (pdata < 0 || !logged_in) { 2203 perror_reply(425, "Can't open passive connection"); 2204 return; 2205 } 2206 pasv_addr = ctrl_addr; 2207 2208 if (bind_pasv_addr() < 0) 2209 goto pasv_error; 2210 len = pasv_addr.su_len; 2211 if (getsockname(pdata, (struct sockaddr *) &pasv_addr, &len) < 0) 2212 goto pasv_error; 2213 if (listen(pdata, 1) < 0) 2214 goto pasv_error; 2215 a = (char *) &pasv_addr.su_sin.sin_addr; 2216 p = (char *) &pasv_addr.su_port; 2217 2218 #define UC(b) (((int) b) & 0xff) 2219 2220 reply(227, "Entering Passive Mode (%d,%d,%d,%d,%d,%d)", UC(a[0]), 2221 UC(a[1]), UC(a[2]), UC(a[3]), UC(p[0]), UC(p[1])); 2222 return; 2223 2224 pasv_error: 2225 (void) close(pdata); 2226 pdata = -1; 2227 perror_reply(425, "Can't open passive connection"); 2228 return; 2229 } 2230 2231 /* 2232 * 228 Entering Long Passive Mode (af, hal, h1, h2, h3,..., pal, p1, p2...) 2233 * 229 Entering Extended Passive Mode (|||port|) 2234 */ 2235 void 2236 long_passive(char *cmd, int pf) 2237 { 2238 int len; 2239 char *p, *a; 2240 2241 if (!logged_in) { 2242 syslog(LOG_NOTICE, "long passive but not logged in"); 2243 reply(503, "Login with USER first."); 2244 return; 2245 } 2246 2247 if (pf != PF_UNSPEC) { 2248 if (ctrl_addr.su_family != pf) { 2249 switch (ctrl_addr.su_family) { 2250 case AF_INET: 2251 pf = 1; 2252 break; 2253 case AF_INET6: 2254 pf = 2; 2255 break; 2256 default: 2257 pf = 0; 2258 break; 2259 } 2260 /* 2261 * XXX 2262 * only EPRT/EPSV ready clients will understand this 2263 */ 2264 if (strcmp(cmd, "EPSV") == 0 && pf) { 2265 reply(522, "Network protocol mismatch, " 2266 "use (%d)", pf); 2267 } else 2268 reply(501, "Network protocol mismatch"); /*XXX*/ 2269 2270 return; 2271 } 2272 } 2273 2274 if (pdata >= 0) 2275 close(pdata); 2276 pdata = socket(ctrl_addr.su_family, SOCK_STREAM, 0); 2277 if (pdata < 0) { 2278 perror_reply(425, "Can't open passive connection"); 2279 return; 2280 } 2281 pasv_addr = ctrl_addr; 2282 if (bind_pasv_addr() < 0) 2283 goto pasv_error; 2284 len = pasv_addr.su_len; 2285 if (getsockname(pdata, (struct sockaddr *) &pasv_addr, &len) < 0) 2286 goto pasv_error; 2287 if (listen(pdata, 1) < 0) 2288 goto pasv_error; 2289 p = (char *) &pasv_addr.su_port; 2290 2291 #define UC(b) (((int) b) & 0xff) 2292 2293 if (strcmp(cmd, "LPSV") == 0) { 2294 switch (pasv_addr.su_family) { 2295 case AF_INET: 2296 a = (char *) &pasv_addr.su_sin.sin_addr; 2297 reply(228, "Entering Long Passive Mode (%d,%d,%d,%d,%d,%d,%d,%d,%d)", 2298 4, 4, UC(a[0]), UC(a[1]), UC(a[2]), UC(a[3]), 2299 2, UC(p[0]), UC(p[1])); 2300 return; 2301 case AF_INET6: 2302 a = (char *) &pasv_addr.su_sin6.sin6_addr; 2303 reply(228, "Entering Long Passive Mode (%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d)", 2304 6, 16, 2305 UC(a[0]), UC(a[1]), UC(a[2]), UC(a[3]), 2306 UC(a[4]), UC(a[5]), UC(a[6]), UC(a[7]), 2307 UC(a[8]), UC(a[9]), UC(a[10]), UC(a[11]), 2308 UC(a[12]), UC(a[13]), UC(a[14]), UC(a[15]), 2309 2, UC(p[0]), UC(p[1])); 2310 return; 2311 } 2312 #undef UC 2313 } else if (strcmp(cmd, "EPSV") == 0) { 2314 switch (pasv_addr.su_family) { 2315 case AF_INET: 2316 case AF_INET6: 2317 reply(229, "Entering Extended Passive Mode (|||%d|)", 2318 ntohs(pasv_addr.su_port)); 2319 return; 2320 } 2321 } else { 2322 /* more proper error code? */ 2323 } 2324 2325 pasv_error: 2326 (void) close(pdata); 2327 pdata = -1; 2328 perror_reply(425, "Can't open passive connection"); 2329 return; 2330 } 2331 2332 /* 2333 * Generate unique name for file with basename "local". 2334 * The file named "local" is already known to exist. 2335 * Generates failure reply on error. 2336 * 2337 * XXX this function should under go changes similar to 2338 * the mktemp(3)/mkstemp(3) changes. 2339 */ 2340 static char * 2341 gunique(const char *local) 2342 { 2343 static char new[MAXPATHLEN]; 2344 struct stat st; 2345 char *cp; 2346 int count; 2347 2348 cp = strrchr(local, '/'); 2349 if (cp) 2350 *cp = '\0'; 2351 if (stat(cp ? local : ".", &st) < 0) { 2352 perror_reply(553, cp ? local : "."); 2353 return (NULL); 2354 } 2355 if (cp) 2356 *cp = '/'; 2357 for (count = 1; count < 100; count++) { 2358 (void)snprintf(new, sizeof(new) - 1, "%s.%d", local, count); 2359 if (stat(new, &st) < 0) 2360 return (new); 2361 } 2362 reply(452, "Unique file name cannot be created."); 2363 return (NULL); 2364 } 2365 2366 /* 2367 * Format and send reply containing system error number. 2368 */ 2369 void 2370 perror_reply(int code, const char *string) 2371 { 2372 int save_errno; 2373 2374 save_errno = errno; 2375 reply(code, "%s: %s.", string, strerror(errno)); 2376 errno = save_errno; 2377 } 2378 2379 static char *onefile[] = { 2380 "", 2381 0 2382 }; 2383 2384 void 2385 send_file_list(const char *whichf) 2386 { 2387 struct stat st; 2388 DIR *dirp = NULL; 2389 struct dirent *dir; 2390 FILE *dout = NULL; 2391 char **dirlist, *dirname, *p; 2392 int simple = 0; 2393 int freeglob = 0; 2394 glob_t gl; 2395 off_t b; 2396 2397 #ifdef __GNUC__ 2398 (void) &dout; 2399 (void) &dirlist; 2400 (void) &simple; 2401 (void) &freeglob; 2402 #endif 2403 2404 p = NULL; 2405 if (strpbrk(whichf, "~{[*?") != NULL) { 2406 int flags = GLOB_BRACE|GLOB_NOCHECK|GLOB_TILDE; 2407 2408 memset(&gl, 0, sizeof(gl)); 2409 freeglob = 1; 2410 if (glob(whichf, flags, 0, &gl)) { 2411 reply(550, "not found"); 2412 goto out; 2413 } else if (gl.gl_pathc == 0) { 2414 errno = ENOENT; 2415 perror_reply(550, whichf); 2416 goto out; 2417 } 2418 dirlist = gl.gl_pathv; 2419 } else { 2420 p = xstrdup(whichf); 2421 onefile[0] = p; 2422 dirlist = onefile; 2423 simple = 1; 2424 } 2425 /* XXX: } for vi sm */ 2426 2427 if (setjmp(urgcatch)) { 2428 transflag = 0; 2429 goto out; 2430 } 2431 while ((dirname = *dirlist++) != NULL) { 2432 int trailingslash = 0; 2433 2434 if (stat(dirname, &st) < 0) { 2435 /* 2436 * If user typed "ls -l", etc, and the client 2437 * used NLST, do what the user meant. 2438 */ 2439 /* XXX: nuke this support? */ 2440 if (dirname[0] == '-' && *dirlist == NULL && 2441 transflag == 0) { 2442 char *argv[] = { INTERNAL_LS, "", NULL }; 2443 2444 argv[1] = dirname; 2445 retrieve(argv, dirname); 2446 goto out; 2447 } 2448 perror_reply(550, whichf); 2449 if (dout != NULL) { 2450 (void) fclose(dout); 2451 transflag = 0; 2452 data = -1; 2453 if (pdata >= 0) 2454 (void)close(pdata); 2455 pdata = -1; 2456 } 2457 goto out; 2458 } 2459 2460 if (S_ISREG(st.st_mode)) { 2461 if (dout == NULL) { 2462 dout = dataconn("file list", (off_t)-1, "w"); 2463 if (dout == NULL) 2464 goto out; 2465 transflag++; 2466 } 2467 b = fprintf(dout, "%s%s\n", dirname, 2468 type == TYPE_A ? "\r" : ""); 2469 total_bytes += b; 2470 total_bytes_out += b; 2471 byte_count += strlen(dirname) + 1; 2472 continue; 2473 } else if (!S_ISDIR(st.st_mode)) 2474 continue; 2475 2476 if (dirname[strlen(dirname) - 1] == '/') 2477 trailingslash++; 2478 2479 if ((dirp = opendir(dirname)) == NULL) 2480 continue; 2481 2482 while ((dir = readdir(dirp)) != NULL) { 2483 char nbuf[MAXPATHLEN]; 2484 2485 if (dir->d_name[0] == '.' && dir->d_namlen == 1) 2486 continue; 2487 if (dir->d_name[0] == '.' && dir->d_name[1] == '.' && 2488 dir->d_namlen == 2) 2489 continue; 2490 2491 (void)snprintf(nbuf, sizeof(nbuf), "%s%s%s", dirname, 2492 trailingslash ? "" : "/", dir->d_name); 2493 2494 /* 2495 * We have to do a stat to ensure it's 2496 * not a directory or special file. 2497 */ 2498 /* XXX: follow RFC959 and filter out non files ? */ 2499 if (simple || (stat(nbuf, &st) == 0 && 2500 S_ISREG(st.st_mode))) { 2501 char *p; 2502 2503 if (dout == NULL) { 2504 dout = dataconn("file list", (off_t)-1, 2505 "w"); 2506 if (dout == NULL) 2507 goto out; 2508 transflag++; 2509 } 2510 p = nbuf; 2511 if (nbuf[0] == '.' && nbuf[1] == '/') 2512 p = &nbuf[2]; 2513 b = fprintf(dout, "%s%s\n", p, 2514 type == TYPE_A ? "\r" : ""); 2515 total_bytes += b; 2516 total_bytes_out += b; 2517 byte_count += strlen(nbuf) + 1; 2518 } 2519 } 2520 (void) closedir(dirp); 2521 } 2522 2523 if (dout == NULL) 2524 reply(550, "No files found."); 2525 else if (ferror(dout) != 0) 2526 perror_reply(550, "Data connection"); 2527 else 2528 reply(226, "Transfer complete."); 2529 2530 transflag = 0; 2531 if (dout != NULL) 2532 (void) fclose(dout); 2533 else if (pdata >= 0) 2534 (void)close(pdata); 2535 data = -1; 2536 pdata = -1; 2537 out: 2538 total_xfers++; 2539 total_xfers_out++; 2540 if (p) 2541 free(p); 2542 if (freeglob) 2543 globfree(&gl); 2544 } 2545 2546 char * 2547 conffilename(const char *s) 2548 { 2549 static char filename[MAXPATHLEN]; 2550 2551 if (*s == '/') 2552 strlcpy(filename, s, sizeof(filename)); 2553 else 2554 (void)snprintf(filename, sizeof(filename), "%s/%s", confdir ,s); 2555 return (filename); 2556 } 2557 2558 /* 2559 * logcmd -- 2560 * based on the arguments, syslog a message: 2561 * if bytes != -1 "<command> <file1> = <bytes> bytes" 2562 * else if file2 != NULL "<command> <file1> <file2>" 2563 * else "<command> <file1>" 2564 * if elapsed != NULL, append "in xxx.yyy seconds" 2565 * if error != NULL, append ": " + error 2566 */ 2567 2568 void 2569 logcmd(const char *command, off_t bytes, const char *file1, const char *file2, 2570 const struct timeval *elapsed, const char *error) 2571 { 2572 char buf[MAXPATHLEN * 2 + 100], realfile[MAXPATHLEN]; 2573 const char *p; 2574 size_t len; 2575 2576 if (logging <=1) 2577 return; 2578 2579 if ((p = realpath(file1, realfile)) == NULL) { 2580 #if 0 /* XXX: too noisy */ 2581 syslog(LOG_WARNING, "realpath `%s' failed: %s", 2582 realfile, strerror(errno)); 2583 #endif 2584 p = file1; 2585 } 2586 len = snprintf(buf, sizeof(buf), "%s %s", command, p); 2587 2588 if (bytes != (off_t)-1) { 2589 len += snprintf(buf + len, sizeof(buf) - len, 2590 " = %qd byte%s", (qdfmt_t) bytes, PLURAL(bytes)); 2591 } else if (file2 != NULL) { 2592 if ((p = realpath(file2, realfile)) == NULL) { 2593 #if 0 /* XXX: too noisy */ 2594 syslog(LOG_WARNING, "realpath `%s' failed: %s", 2595 realfile, strerror(errno)); 2596 #endif 2597 p = file2; 2598 } 2599 len += snprintf(buf + len, sizeof(buf) - len, " %s", p); 2600 } 2601 2602 if (elapsed != NULL) { 2603 len += snprintf(buf + len, sizeof(buf) - len, 2604 " in %ld.%.03d seconds", elapsed->tv_sec, 2605 (int)(elapsed->tv_usec / 1000)); 2606 } 2607 2608 if (error != NULL) 2609 len += snprintf(buf + len, sizeof(buf) - len, ": %s", error); 2610 2611 syslog(LOG_INFO, "%s", buf); 2612 } 2613 2614 char * 2615 xstrdup(const char *s) 2616 { 2617 char *new = strdup(s); 2618 2619 if (new == NULL) 2620 fatal("Local resource failure: malloc"); 2621 /* NOTREACHED */ 2622 return (new); 2623 } 2624
Indexes created Fri Sep 26 20:09:58 GMT 2025