ftpd.c revision 1.91
1 /* $NetBSD: ftpd.c,v 1.91 2000/06/02 00:19:04 fredb 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 1.91 2000/06/02 00:19:04 fredb 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 static struct utmp utmp; /* for utmp */ 182 183 static char *anondir = NULL; 184 static char confdir[MAXPATHLEN]; 185 186 #if defined(KERBEROS) || defined(KERBEROS5) 187 int has_ccache = 0; 188 int notickets = 1; 189 char *krbtkfile_env = NULL; 190 char *tty = ttyline; 191 #endif 192 193 int epsvall = 0; 194 195 /* 196 * Timeout intervals for retrying connections 197 * to hosts that don't accept PORT cmds. This 198 * is a kludge, but given the problems with TCP... 199 */ 200 #define SWAITMAX 90 /* wait at most 90 seconds */ 201 #define SWAITINT 5 /* interval between retries */ 202 203 int swaitmax = SWAITMAX; 204 int swaitint = SWAITINT; 205 206 #define CURCLASSTYPE curclass.type == CLASS_GUEST ? "GUEST" : \ 207 curclass.type == CLASS_CHROOT ? "CHROOT" : \ 208 curclass.type == CLASS_REAL ? "REAL" : \ 209 "<unknown>" 210 211 static void ack(const char *); 212 static int bind_pasv_addr(void); 213 static int checkuser(const char *, const char *, int, int, char **); 214 static int checkaccess(const char *); 215 static FILE *dataconn(const char *, off_t, const char *); 216 static void dolog(struct sockaddr *); 217 static void end_login(void); 218 static FILE *getdatasock(const char *); 219 static char *gunique(const char *); 220 static void lostconn(int); 221 static void myoob(int); 222 static int receive_data(FILE *, FILE *); 223 static void replydirname(const char *, const char *); 224 static int send_data(FILE *, FILE *, off_t, int); 225 static struct passwd *sgetpwnam(const char *); 226 227 int main(int, char *[]); 228 229 #if defined(KERBEROS) || defined(KERBEROS5) 230 int klogin(struct passwd *, char *, char *, char *); 231 void kdestroy(void); 232 #endif 233 234 int 235 main(int argc, char *argv[]) 236 { 237 int addrlen, ch, on = 1, tos, keepalive; 238 #ifdef KERBEROS5 239 krb5_error_code kerror; 240 #endif 241 242 connections = 1; 243 debug = 0; 244 logging = 0; 245 pdata = -1; 246 sflag = 0; 247 usedefault = 1; 248 (void)strcpy(confdir, _DEFAULT_CONFDIR); 249 hostname[0] = '\0'; 250 251 while ((ch = getopt(argc, argv, "a:c:C:dh:lst:T:u:Uv")) != -1) { 252 switch (ch) { 253 case 'a': 254 anondir = optarg; 255 break; 256 257 case 'c': 258 (void)strlcpy(confdir, optarg, sizeof(confdir)); 259 break; 260 261 case 'C': 262 pw = sgetpwnam(optarg); 263 exit(checkaccess(optarg) ? 0 : 1); 264 /* NOTREACHED */ 265 266 case 'd': 267 case 'v': /* deprecated */ 268 debug = 1; 269 break; 270 271 case 'h': 272 strlcpy(hostname, optarg, sizeof(hostname)); 273 break; 274 275 case 'l': 276 logging++; /* > 1 == extra logging */ 277 break; 278 279 case 's': 280 sflag = 1; 281 break; 282 283 case 't': 284 case 'T': 285 case 'u': 286 warnx("-%c has been deprecated in favour of ftpd.conf", 287 ch); 288 break; 289 290 case 'U': 291 doutmp = 1; 292 break; 293 294 default: 295 if (optopt == 'a' || optopt == 'C') 296 exit(1); 297 warnx("unknown flag -%c ignored", optopt); 298 break; 299 } 300 } 301 302 /* 303 * LOG_NDELAY sets up the logging connection immediately, 304 * necessary for anonymous ftp's that chroot and can't do it later. 305 */ 306 openlog("ftpd", LOG_PID | LOG_NDELAY, LOG_FTP); 307 addrlen = sizeof(his_addr); /* xxx */ 308 if (getpeername(0, (struct sockaddr *)&his_addr, &addrlen) < 0) { 309 syslog(LOG_ERR, "getpeername (%s): %m",argv[0]); 310 exit(1); 311 } 312 addrlen = sizeof(ctrl_addr); 313 if (getsockname(0, (struct sockaddr *)&ctrl_addr, &addrlen) < 0) { 314 syslog(LOG_ERR, "getsockname (%s): %m",argv[0]); 315 exit(1); 316 } 317 if (his_addr.su_family == AF_INET6 318 && IN6_IS_ADDR_V4MAPPED(&his_addr.su_sin6.sin6_addr)) { 319 #if 1 320 /* 321 * IPv4 control connection arrived to AF_INET6 socket. 322 * I hate to do this, but this is the easiest solution. 323 * 324 * The assumption is untrue on SIIT environment. 325 */ 326 union sockunion tmp_addr; 327 const int off = sizeof(struct in6_addr) - sizeof(struct in_addr); 328 329 tmp_addr = his_addr; 330 memset(&his_addr, 0, sizeof(his_addr)); 331 his_addr.su_sin.sin_family = AF_INET; 332 his_addr.su_sin.sin_len = sizeof(his_addr.su_sin); 333 memcpy(&his_addr.su_sin.sin_addr, 334 &tmp_addr.su_sin6.sin6_addr.s6_addr[off], 335 sizeof(his_addr.su_sin.sin_addr)); 336 his_addr.su_sin.sin_port = tmp_addr.su_sin6.sin6_port; 337 338 tmp_addr = ctrl_addr; 339 memset(&ctrl_addr, 0, sizeof(ctrl_addr)); 340 ctrl_addr.su_sin.sin_family = AF_INET; 341 ctrl_addr.su_sin.sin_len = sizeof(ctrl_addr.su_sin); 342 memcpy(&ctrl_addr.su_sin.sin_addr, 343 &tmp_addr.su_sin6.sin6_addr.s6_addr[off], 344 sizeof(ctrl_addr.su_sin.sin_addr)); 345 ctrl_addr.su_sin.sin_port = tmp_addr.su_sin6.sin6_port; 346 #else 347 while (fgets(line, sizeof(line), fd) != NULL) { 348 if ((cp = strchr(line, '\n')) != NULL) 349 *cp = '\0'; 350 lreply(530, "%s", line); 351 } 352 (void) fflush(stdout); 353 (void) fclose(fd); 354 reply(530, 355 "Connection from IPv4 mapped address is not supported."); 356 exit(0); 357 #endif 358 359 mapped = 1; 360 } else 361 mapped = 0; 362 #ifdef IP_TOS 363 if (!mapped && his_addr.su_family == AF_INET) { 364 tos = IPTOS_LOWDELAY; 365 if (setsockopt(0, IPPROTO_IP, IP_TOS, (char *)&tos, 366 sizeof(int)) < 0) 367 syslog(LOG_WARNING, "setsockopt (IP_TOS): %m"); 368 } 369 #endif 370 data_source.su_port = htons(ntohs(ctrl_addr.su_port) - 1); 371 372 /* if the hostname hasn't been given, attempt to determine it */ 373 if (hostname[0] == '\0') { 374 if (getnameinfo((struct sockaddr *)&ctrl_addr, ctrl_addr.su_len, 375 hostname, sizeof(hostname), NULL, 0, 0) != 0) 376 (void)gethostname(hostname, sizeof(hostname)); 377 hostname[sizeof(hostname) - 1] = '\0'; 378 } 379 380 /* set this here so klogin can use it... */ 381 (void)snprintf(ttyline, sizeof(ttyline), "ftp%d", getpid()); 382 383 (void) freopen(_PATH_DEVNULL, "w", stderr); 384 (void) signal(SIGPIPE, lostconn); 385 (void) signal(SIGCHLD, SIG_IGN); 386 if (signal(SIGURG, myoob) == SIG_ERR) 387 syslog(LOG_ERR, "signal: %m"); 388 389 /* Try to handle urgent data inline */ 390 #ifdef SO_OOBINLINE 391 if (setsockopt(0, SOL_SOCKET, SO_OOBINLINE, (char *)&on, sizeof(on)) < 0) 392 syslog(LOG_ERR, "setsockopt: %m"); 393 #endif 394 /* Set keepalives on the socket to detect dropped connections. */ 395 #ifdef SO_KEEPALIVE 396 keepalive = 1; 397 if (setsockopt(0, SOL_SOCKET, SO_KEEPALIVE, (char *)&keepalive, 398 sizeof(int)) < 0) 399 syslog(LOG_WARNING, "setsockopt (SO_KEEPALIVE): %m"); 400 #endif 401 402 #ifdef F_SETOWN 403 if (fcntl(fileno(stdin), F_SETOWN, getpid()) == -1) 404 syslog(LOG_ERR, "fcntl F_SETOWN: %m"); 405 #endif 406 dolog((struct sockaddr *)&his_addr); 407 /* 408 * Set up default state 409 */ 410 data = -1; 411 type = TYPE_A; 412 form = FORM_N; 413 stru = STRU_F; 414 mode = MODE_S; 415 tmpline[0] = '\0'; 416 hasyyerrored = 0; 417 418 #ifdef KERBEROS5 419 kerror = krb5_init_context(&kcontext); 420 if (kerror) { 421 syslog(LOG_NOTICE, "%s when initializing Kerberos context", 422 error_message(kerror)); 423 exit(0); 424 } 425 #endif /* KERBEROS5 */ 426 427 init_curclass(); 428 curclass.timeout = 300; /* 5 minutes, as per login(1) */ 429 curclass.type = CLASS_REAL; 430 431 /* If logins are disabled, print out the message. */ 432 if (format_file(_PATH_NOLOGIN, 530)) { 433 reply(530, "System not available."); 434 exit(0); 435 } 436 (void)format_file(conffilename(_PATH_FTPWELCOME), 220); 437 /* reply(220,) must follow */ 438 reply(220, "%s FTP server (%s) ready.", hostname, FTPD_VERSION); 439 440 (void) setjmp(errcatch); 441 for (;;) 442 (void) yyparse(); 443 /* NOTREACHED */ 444 } 445 446 static void 447 lostconn(int signo) 448 { 449 450 if (debug) 451 syslog(LOG_DEBUG, "lost connection"); 452 dologout(1); 453 } 454 455 /* 456 * Save the result of a getpwnam. Used for USER command, since 457 * the data returned must not be clobbered by any other command 458 * (e.g., globbing). 459 */ 460 static struct passwd * 461 sgetpwnam(const char *name) 462 { 463 static struct passwd save; 464 struct passwd *p; 465 466 if ((p = getpwnam(name)) == NULL) 467 return (p); 468 if (save.pw_name) { 469 free((char *)save.pw_name); 470 memset(save.pw_passwd, 0, strlen(save.pw_passwd)); 471 free((char *)save.pw_passwd); 472 free((char *)save.pw_gecos); 473 free((char *)save.pw_dir); 474 free((char *)save.pw_shell); 475 } 476 save = *p; 477 save.pw_name = xstrdup(p->pw_name); 478 save.pw_passwd = xstrdup(p->pw_passwd); 479 save.pw_gecos = xstrdup(p->pw_gecos); 480 save.pw_dir = xstrdup(p->pw_dir); 481 save.pw_shell = xstrdup(p->pw_shell); 482 return (&save); 483 } 484 485 static int login_attempts; /* number of failed login attempts */ 486 static int askpasswd; /* had user command, ask for passwd */ 487 static char curname[10]; /* current USER name */ 488 489 /* 490 * USER command. 491 * Sets global passwd pointer pw if named account exists and is acceptable; 492 * sets askpasswd if a PASS command is expected. If logged in previously, 493 * need to reset state. If name is "ftp" or "anonymous", the name is not in 494 * _PATH_FTPUSERS, and ftp account exists, set guest and pw, then just return. 495 * If account doesn't exist, ask for passwd anyway. Otherwise, check user 496 * requesting login privileges. Disallow anyone who does not have a standard 497 * shell as returned by getusershell(). Disallow anyone mentioned in the file 498 * _PATH_FTPUSERS to allow people such as root and uucp to be avoided. 499 */ 500 void 501 user(const char *name) 502 { 503 if (logged_in) { 504 switch (curclass.type) { 505 case CLASS_GUEST: 506 reply(530, "Can't change user from guest login."); 507 return; 508 case CLASS_CHROOT: 509 reply(530, "Can't change user from chroot user."); 510 return; 511 case CLASS_REAL: 512 end_login(); 513 break; 514 default: 515 abort(); 516 } 517 } 518 519 #if defined(KERBEROS) || defined(KERBEROS5) 520 kdestroy(); 521 #endif 522 523 curclass.type = CLASS_REAL; 524 if (strcmp(name, "ftp") == 0 || strcmp(name, "anonymous") == 0) { 525 /* need `pw' setup for checkaccess() and checkuser () */ 526 if ((pw = sgetpwnam("ftp")) == NULL) 527 reply(530, "User %s unknown.", name); 528 else if (! checkaccess("ftp") || ! checkaccess("anonymous")) 529 reply(530, "User %s access denied.", name); 530 else { 531 curclass.type = CLASS_GUEST; 532 askpasswd = 1; 533 reply(331, 534 "Guest login ok, type your name as password."); 535 } 536 if (!askpasswd && logging) 537 syslog(LOG_NOTICE, 538 "ANONYMOUS FTP LOGIN REFUSED FROM %s", remotehost); 539 return; 540 } 541 542 pw = sgetpwnam(name); 543 if (logging) 544 strlcpy(curname, name, sizeof(curname)); 545 546 #ifdef SKEY 547 if (skey_haskey(name) == 0) { 548 char *myskey; 549 550 myskey = skey_keyinfo(name); 551 reply(331, "Password [%s] required for %s.", 552 myskey ? myskey : "error getting challenge", name); 553 } else 554 #endif 555 reply(331, "Password required for %s.", name); 556 557 askpasswd = 1; 558 /* 559 * Delay before reading passwd after first failed 560 * attempt to slow down passwd-guessing programs. 561 */ 562 if (login_attempts) 563 sleep((unsigned) login_attempts); 564 } 565 566 /* 567 * Determine whether something is to happen (allow access, chroot) 568 * for a user. Each line is a shell-style glob followed by 569 * `yes' or `no'. 570 * 571 * For backward compatability, `allow' and `deny' are synonymns 572 * for `yes' and `no', respectively. 573 * 574 * Each glob is matched against the username in turn, and the first 575 * match found is used. If no match is found, the result is the 576 * argument `def'. If a match is found but without and explicit 577 * `yes'/`no', the result is the opposite of def. 578 * 579 * If the file doesn't exist at all, the result is the argument 580 * `nofile' 581 * 582 * Any line starting with `#' is considered a comment and ignored. 583 * 584 * Returns 0 if the user is denied, or 1 if they are allowed. 585 * 586 * NOTE: needs struct passwd *pw setup before use. 587 */ 588 int 589 checkuser(const char *fname, const char *name, int def, int nofile, 590 char **retclass) 591 { 592 FILE *fd; 593 int retval; 594 char *glob, *perm, *class, *buf, *p; 595 size_t len, line; 596 597 retval = def; 598 if (retclass != NULL) 599 *retclass = NULL; 600 if ((fd = fopen(conffilename(fname), "r")) == NULL) 601 return nofile; 602 603 line = 0; 604 for (; 605 (buf = fparseln(fd, &len, &line, NULL, FPARSELN_UNESCCOMM | 606 FPARSELN_UNESCCONT | FPARSELN_UNESCESC)) != NULL; 607 free(buf), buf = NULL) { 608 glob = perm = class = NULL; 609 p = buf; 610 if (len < 1) 611 continue; 612 if (p[len - 1] == '\n') 613 p[--len] = '\0'; 614 if (EMPTYSTR(p)) 615 continue; 616 617 NEXTWORD(p, glob); 618 NEXTWORD(p, perm); 619 NEXTWORD(p, class); 620 if (EMPTYSTR(glob)) 621 continue; 622 if (!EMPTYSTR(class)) { 623 if (strcasecmp(class, "all") == 0 || 624 strcasecmp(class, "none") == 0) { 625 syslog(LOG_WARNING, 626 "%s line %d: illegal user-defined class `%s' - skipping entry", 627 fname, (int)line, class); 628 continue; 629 } 630 } 631 632 /* have a host specifier */ 633 if ((p = strchr(glob, '@')) != NULL) { 634 u_int32_t net, mask, addr; 635 int bits; 636 637 *p++ = '\0'; 638 /* check against network or CIDR */ 639 if (isdigit(*p) && 640 (bits = inet_net_pton(AF_INET, p, 641 &net, sizeof(net))) != -1) { 642 net = ntohl(net); 643 mask = 0xffffffffU << (32 - bits); 644 addr = ntohl(his_addr.su_sin.sin_addr.s_addr); 645 if ((addr & mask) != net) 646 continue; 647 648 /* check against hostname glob */ 649 } else if (fnmatch(p, remotehost, 0) != 0) 650 continue; 651 } 652 653 /* have a group specifier */ 654 if ((p = strchr(glob, ':')) != NULL) { 655 gid_t *groups, *ng; 656 int gsize, i, found; 657 658 *p++ = '\0'; 659 groups = NULL; 660 gsize = 16; 661 do { 662 ng = realloc(groups, gsize * sizeof(gid_t)); 663 if (ng == NULL) 664 fatal( 665 "Local resource failure: realloc"); 666 groups = ng; 667 } while (getgrouplist(pw->pw_name, pw->pw_gid, 668 groups, &gsize) == -1); 669 found = 0; 670 for (i = 0; i < gsize; i++) { 671 struct group *g; 672 673 if ((g = getgrgid(groups[i])) == NULL) 674 continue; 675 if (fnmatch(p, g->gr_name, 0) == 0) { 676 found = 1; 677 break; 678 } 679 } 680 free(groups); 681 if (!found) 682 continue; 683 } 684 685 /* check against username glob */ 686 if (fnmatch(glob, name, 0) != 0) 687 continue; 688 689 if (perm != NULL && 690 ((strcasecmp(perm, "allow") == 0) || 691 (strcasecmp(perm, "yes") == 0))) 692 retval = 1; 693 else if (perm != NULL && 694 ((strcasecmp(perm, "deny") == 0) || 695 (strcasecmp(perm, "no") == 0))) 696 retval = 0; 697 else 698 retval = !def; 699 if (!EMPTYSTR(class) && retclass != NULL) 700 *retclass = xstrdup(class); 701 free(buf); 702 break; 703 } 704 (void) fclose(fd); 705 return (retval); 706 } 707 708 /* 709 * Check if user is allowed by /etc/ftpusers 710 * returns 1 for yes, 0 for no 711 * 712 * NOTE: needs struct passwd *pw setup (for checkuser()) 713 */ 714 int 715 checkaccess(const char *name) 716 { 717 718 return (checkuser(_PATH_FTPUSERS, name, 1, 0, NULL)); 719 } 720 721 /* 722 * Terminate login as previous user, if any, resetting state; 723 * used when USER command is given or login fails. 724 */ 725 static void 726 end_login(void) 727 { 728 729 (void) seteuid((uid_t)0); 730 if (logged_in) { 731 logwtmp(ttyline, "", ""); 732 if (doutmp) 733 logout(utmp.ut_line); 734 } 735 pw = NULL; 736 logged_in = 0; 737 quietmessages = 0; 738 curclass.type = CLASS_REAL; 739 } 740 741 void 742 pass(const char *passwd) 743 { 744 int rval; 745 const char *cp, *shell, *home; 746 char *class; 747 748 class = NULL; 749 if (logged_in || askpasswd == 0) { 750 reply(503, "Login with USER first."); 751 return; 752 } 753 askpasswd = 0; 754 if (curclass.type != CLASS_GUEST) { 755 /* "ftp" is only account allowed no password */ 756 if (pw == NULL) { 757 rval = 1; /* failure below */ 758 goto skip; 759 } 760 #if defined(KERBEROS) || defined(KERBEROS5) 761 if (klogin(pw, "", hostname, (char *)passwd) == 0) { 762 rval = 0; 763 goto skip; 764 } 765 #endif 766 #ifdef SKEY 767 if (skey_haskey(pw->pw_name) == 0) { 768 char *p; 769 int r; 770 771 p = xstrdup(passwd); 772 r = skey_passcheck(pw->pw_name, p); 773 free(p); 774 if (r != -1) { 775 rval = 0; 776 goto skip; 777 } 778 } 779 #endif 780 if (!sflag && *pw->pw_passwd != '\0' && 781 !strcmp(crypt(passwd, pw->pw_passwd), pw->pw_passwd)) { 782 rval = 0; 783 goto skip; 784 } 785 rval = 1; 786 787 skip: 788 if (pw != NULL && pw->pw_expire && time(NULL) >= pw->pw_expire) 789 rval = 2; 790 /* 791 * If rval > 0, the user failed the authentication check 792 * above. If rval == 0, either Kerberos or local authentication 793 * succeeded. 794 */ 795 if (rval) { 796 reply(530, rval == 2 ? "Password expired." : 797 "Login incorrect."); 798 if (logging) { 799 syslog(LOG_NOTICE, 800 "FTP LOGIN FAILED FROM %s", remotehost); 801 syslog(LOG_AUTHPRIV | LOG_NOTICE, 802 "FTP LOGIN FAILED FROM %s, %s", 803 remotehost, curname); 804 } 805 pw = NULL; 806 if (login_attempts++ >= 5) { 807 syslog(LOG_NOTICE, 808 "repeated login failures from %s", 809 remotehost); 810 exit(0); 811 } 812 return; 813 } 814 } 815 816 /* password was ok; see if anything else prevents login */ 817 if (! checkuser(_PATH_FTPUSERS, pw->pw_name, 1, 0, &class)) { 818 reply(530, "User %s may not use FTP.", pw->pw_name); 819 if (logging) 820 syslog(LOG_NOTICE, "FTP LOGIN REFUSED FROM %s, %s", 821 remotehost, pw->pw_name); 822 goto bad; 823 } 824 /* check for valid shell, if not guest user */ 825 if ((shell = pw->pw_shell) == NULL || *shell == 0) 826 shell = _PATH_BSHELL; 827 while ((cp = getusershell()) != NULL) 828 if (strcmp(cp, shell) == 0) 829 break; 830 endusershell(); 831 if (cp == NULL && curclass.type != CLASS_GUEST) { 832 reply(530, "User %s may not use FTP.", pw->pw_name); 833 if (logging) 834 syslog(LOG_NOTICE, "FTP LOGIN REFUSED FROM %s, %s", 835 remotehost, pw->pw_name); 836 goto bad; 837 } 838 839 login_attempts = 0; /* this time successful */ 840 if (setegid((gid_t)pw->pw_gid) < 0) { 841 reply(550, "Can't set gid."); 842 goto bad; 843 } 844 (void) initgroups(pw->pw_name, pw->pw_gid); 845 846 /* open wtmp before chroot */ 847 logwtmp(ttyline, pw->pw_name, remotehost); 848 849 /* open utmp before chroot */ 850 if (doutmp) { 851 memset((void *)&utmp, 0, sizeof(utmp)); 852 (void)time(&utmp.ut_time); 853 (void)strncpy(utmp.ut_name, pw->pw_name, sizeof(utmp.ut_name)); 854 (void)strncpy(utmp.ut_host, remotehost, sizeof(utmp.ut_host)); 855 (void)strncpy(utmp.ut_line, ttyline, sizeof(utmp.ut_line)); 856 login(&utmp); 857 } 858 859 logged_in = 1; 860 861 /* check user in /etc/ftpchroot */ 862 if (checkuser(_PATH_FTPCHROOT, pw->pw_name, 0, 0, NULL)) { 863 if (curclass.type == CLASS_GUEST) { 864 syslog(LOG_NOTICE, 865 "Can't change guest user to chroot class; remove entry in %s", 866 _PATH_FTPCHROOT); 867 exit(1); 868 } 869 curclass.type = CLASS_CHROOT; 870 } 871 if (class == NULL) { 872 switch (curclass.type) { 873 case CLASS_GUEST: 874 class = xstrdup("guest"); 875 break; 876 case CLASS_CHROOT: 877 class = xstrdup("chroot"); 878 break; 879 case CLASS_REAL: 880 class = xstrdup("real"); 881 break; 882 default: 883 abort(); 884 } 885 } 886 887 /* parse ftpd.conf, setting up various parameters */ 888 parse_conf(class); 889 count_users(); 890 if (curclass.limit != -1 && connections > curclass.limit) { 891 if (! EMPTYSTR(curclass.limitfile)) 892 (void)format_file(conffilename(curclass.limitfile),530); 893 reply(530, 894 "User %s access denied, connection limit of %d reached.", 895 pw->pw_name, curclass.limit); 896 syslog(LOG_NOTICE, 897 "Maximum connection limit of %d for class %s reached, login refused", 898 curclass.limit, curclass.classname); 899 goto bad; 900 } 901 902 home = "/"; 903 switch (curclass.type) { 904 case CLASS_GUEST: 905 /* 906 * We MUST do a chdir() after the chroot. Otherwise 907 * the old current directory will be accessible as "." 908 * outside the new root! 909 */ 910 if (chroot(anondir ? anondir : pw->pw_dir) < 0 || 911 chdir("/") < 0) { 912 reply(550, "Can't set guest privileges."); 913 goto bad; 914 } 915 break; 916 case CLASS_CHROOT: 917 if (chroot(pw->pw_dir) < 0 || chdir("/") < 0) { 918 reply(550, "Can't change root."); 919 goto bad; 920 } 921 break; 922 case CLASS_REAL: 923 if (chdir(pw->pw_dir) < 0) { 924 if (chdir("/") < 0) { 925 reply(530, 926 "User %s: can't change directory to %s.", 927 pw->pw_name, pw->pw_dir); 928 goto bad; 929 } else 930 lreply(230, 931 "No directory! Logging in with home=/"); 932 } else 933 home = pw->pw_dir; 934 break; 935 } 936 if (seteuid((uid_t)pw->pw_uid) < 0) { 937 reply(550, "Can't set uid."); 938 goto bad; 939 } 940 setenv("HOME", home, 1); 941 942 if (curclass.type == CLASS_GUEST && passwd[0] == '-') 943 quietmessages = 1; 944 945 /* 946 * Display a login message, if it exists. 947 * N.B. reply(230,) must follow the message. 948 */ 949 (void)format_file(conffilename(curclass.motd), 230); 950 show_chdir_messages(230); 951 if (curclass.type == CLASS_GUEST) { 952 reply(230, "Guest login ok, access restrictions apply."); 953 #ifdef HASSETPROCTITLE 954 snprintf(proctitle, sizeof(proctitle), 955 "%s: anonymous/%.*s", remotehost, 956 (int) (sizeof(proctitle) - sizeof(remotehost) - 957 sizeof(": anonymous/")), passwd); 958 setproctitle(proctitle); 959 #endif /* HASSETPROCTITLE */ 960 if (logging) 961 syslog(LOG_INFO, 962 "ANONYMOUS FTP LOGIN FROM %s, %s (class: %s, type: %s)", 963 remotehost, passwd, 964 curclass.classname, CURCLASSTYPE); 965 } else { 966 reply(230, "User %s logged in.", pw->pw_name); 967 #ifdef HASSETPROCTITLE 968 snprintf(proctitle, sizeof(proctitle), 969 "%s: %s", remotehost, pw->pw_name); 970 setproctitle(proctitle); 971 #endif /* HASSETPROCTITLE */ 972 if (logging) 973 syslog(LOG_INFO, 974 "FTP LOGIN FROM %s as %s (class: %s, type: %s)", 975 remotehost, pw->pw_name, 976 curclass.classname, CURCLASSTYPE); 977 } 978 (void) umask(curclass.umask); 979 goto cleanuppass; 980 bad: 981 /* Forget all about it... */ 982 end_login(); 983 cleanuppass: 984 if (class) 985 free(class); 986 } 987 988 void 989 retrieve(char *argv[], const char *name) 990 { 991 FILE *fin = NULL, *dout; 992 struct stat st; 993 int (*closefunc)(FILE *) = NULL; 994 int log, sendrv, closerv, stderrfd, isconversion, isdata, isls; 995 struct timeval start, finish, td, *tdp; 996 const char *dispname; 997 998 sendrv = closerv = stderrfd = -1; 999 isconversion = isdata = isls = log = 0; 1000 tdp = NULL; 1001 dispname = name; 1002 if (argv == NULL) { 1003 log = 1; 1004 isdata = 1; 1005 fin = fopen(name, "r"); 1006 closefunc = fclose; 1007 if (fin == NULL) 1008 argv = do_conversion(name); 1009 if (argv != NULL) { 1010 isconversion++; 1011 syslog(LOG_INFO, "get command: '%s' on '%s'", 1012 argv[0], name); 1013 } 1014 } 1015 if (argv != NULL) { 1016 char temp[MAXPATHLEN]; 1017 1018 if (strcmp(argv[0], INTERNAL_LS) == 0) { 1019 isls = 1; 1020 stderrfd = -1; 1021 } else { 1022 (void)snprintf(temp, sizeof(temp), "%s", TMPFILE); 1023 stderrfd = mkstemp(temp); 1024 if (stderrfd != -1) 1025 (void)unlink(temp); 1026 } 1027 dispname = argv[0]; 1028 fin = ftpd_popen(argv, "r", stderrfd); 1029 closefunc = ftpd_pclose; 1030 st.st_size = -1; 1031 st.st_blksize = BUFSIZ; 1032 } 1033 if (fin == NULL) { 1034 if (errno != 0) { 1035 perror_reply(550, dispname); 1036 if (log) 1037 logcmd("get", -1, name, NULL, NULL, 1038 strerror(errno)); 1039 } 1040 goto cleanupretrieve; 1041 } 1042 byte_count = -1; 1043 if (argv == NULL 1044 && (fstat(fileno(fin), &st) < 0 || !S_ISREG(st.st_mode))) { 1045 reply(550, "%s: not a plain file.", dispname); 1046 goto done; 1047 } 1048 if (restart_point) { 1049 if (type == TYPE_A) { 1050 off_t i; 1051 int c; 1052 1053 for (i = 0; i < restart_point; i++) { 1054 if ((c=getc(fin)) == EOF) { 1055 perror_reply(550, dispname); 1056 goto done; 1057 } 1058 if (c == '\n') 1059 i++; 1060 } 1061 } else if (lseek(fileno(fin), restart_point, SEEK_SET) < 0) { 1062 perror_reply(550, dispname); 1063 goto done; 1064 } 1065 } 1066 dout = dataconn(dispname, st.st_size, "w"); 1067 if (dout == NULL) 1068 goto done; 1069 1070 (void)gettimeofday(&start, NULL); 1071 sendrv = send_data(fin, dout, st.st_blksize, isdata); 1072 (void)gettimeofday(&finish, NULL); 1073 (void) fclose(dout); 1074 timersub(&finish, &start, &td); 1075 tdp = &td; 1076 data = -1; 1077 done: 1078 if (log) 1079 logcmd("get", byte_count, name, NULL, tdp, NULL); 1080 closerv = (*closefunc)(fin); 1081 if (sendrv == 0) { 1082 FILE *err; 1083 struct stat sb; 1084 1085 if (!isls && argv != NULL && closerv != 0) { 1086 lreply(226, 1087 "Command returned an exit status of %d", 1088 closerv); 1089 if (isconversion) 1090 syslog(LOG_INFO, 1091 "retrieve command: '%s' returned %d", 1092 argv[0], closerv); 1093 } 1094 if (!isls && argv != NULL && stderrfd != -1 && 1095 (fstat(stderrfd, &sb) == 0) && sb.st_size > 0 && 1096 ((err = fdopen(stderrfd, "r")) != NULL)) { 1097 char *cp, line[LINE_MAX]; 1098 1099 lreply(226, "Command error messages:"); 1100 rewind(err); 1101 while (fgets(line, sizeof(line), err) != NULL) { 1102 if ((cp = strchr(line, '\n')) != NULL) 1103 *cp = '\0'; 1104 lreply(0, " %s", line); 1105 } 1106 (void) fflush(stdout); 1107 (void) fclose(err); 1108 /* a reply(226,) must follow */ 1109 } 1110 reply(226, "Transfer complete."); 1111 } 1112 cleanupretrieve: 1113 if (pdata >= 0) 1114 (void)close(pdata); 1115 pdata = -1; 1116 if (stderrfd != -1) 1117 (void)close(stderrfd); 1118 if (isconversion) 1119 free(argv); 1120 } 1121 1122 void 1123 store(const char *name, const char *mode, int unique) 1124 { 1125 FILE *fout, *din; 1126 struct stat st; 1127 int (*closefunc)(FILE *); 1128 struct timeval start, finish, td, *tdp; 1129 char *desc; 1130 1131 desc = (*mode == 'w') ? "put" : "append"; 1132 if (unique && stat(name, &st) == 0 && 1133 (name = gunique(name)) == NULL) { 1134 logcmd(desc, -1, name, NULL, NULL, "cannot create unique file"); 1135 goto cleanupstore; 1136 } 1137 1138 if (restart_point) 1139 mode = "r+"; 1140 fout = fopen(name, mode); 1141 closefunc = fclose; 1142 tdp = NULL; 1143 if (fout == NULL) { 1144 perror_reply(553, name); 1145 logcmd(desc, -1, name, NULL, NULL, strerror(errno)); 1146 goto cleanupstore; 1147 } 1148 byte_count = -1; 1149 if (restart_point) { 1150 if (type == TYPE_A) { 1151 off_t i; 1152 int c; 1153 1154 for (i = 0; i < restart_point; i++) { 1155 if ((c=getc(fout)) == EOF) { 1156 perror_reply(550, name); 1157 goto done; 1158 } 1159 if (c == '\n') 1160 i++; 1161 } 1162 /* 1163 * We must do this seek to "current" position 1164 * because we are changing from reading to 1165 * writing. 1166 */ 1167 if (fseek(fout, 0L, SEEK_CUR) < 0) { 1168 perror_reply(550, name); 1169 goto done; 1170 } 1171 } else if (lseek(fileno(fout), restart_point, SEEK_SET) < 0) { 1172 perror_reply(550, name); 1173 goto done; 1174 } 1175 } 1176 din = dataconn(name, (off_t)-1, "r"); 1177 if (din == NULL) 1178 goto done; 1179 (void)gettimeofday(&start, NULL); 1180 if (receive_data(din, fout) == 0) { 1181 if (unique) 1182 reply(226, "Transfer complete (unique file name:%s).", 1183 name); 1184 else 1185 reply(226, "Transfer complete."); 1186 } 1187 (void)gettimeofday(&finish, NULL); 1188 (void) fclose(din); 1189 timersub(&finish, &start, &td); 1190 tdp = &td; 1191 data = -1; 1192 done: 1193 logcmd(desc, byte_count, name, NULL, tdp, NULL); 1194 (*closefunc)(fout); 1195 cleanupstore: 1196 if (pdata >= 0) 1197 (void)close(pdata); 1198 pdata = -1; 1199 } 1200 1201 static FILE * 1202 getdatasock(const char *mode) 1203 { 1204 int on = 1, s, t, tries; 1205 1206 if (data >= 0) 1207 return (fdopen(data, mode)); 1208 (void) seteuid((uid_t)0); 1209 s = socket(ctrl_addr.su_family, SOCK_STREAM, 0); 1210 if (s < 0) 1211 goto bad; 1212 if (setsockopt(s, SOL_SOCKET, SO_REUSEADDR, 1213 (char *) &on, sizeof(on)) < 0) 1214 goto bad; 1215 if (setsockopt(s, SOL_SOCKET, SO_KEEPALIVE, 1216 (char *) &on, sizeof(on)) < 0) 1217 goto bad; 1218 /* anchor socket to avoid multi-homing problems */ 1219 data_source = ctrl_addr; 1220 data_source.su_port = htons(20); /* ftp-data port */ 1221 for (tries = 1; ; tries++) { 1222 if (bind(s, (struct sockaddr *)&data_source, 1223 data_source.su_len) >= 0) 1224 break; 1225 if (errno != EADDRINUSE || tries > 10) 1226 goto bad; 1227 sleep(tries); 1228 } 1229 (void) seteuid((uid_t)pw->pw_uid); 1230 #ifdef IP_TOS 1231 if (!mapped && ctrl_addr.su_family == AF_INET) { 1232 on = IPTOS_THROUGHPUT; 1233 if (setsockopt(s, IPPROTO_IP, IP_TOS, (char *)&on, 1234 sizeof(int)) < 0) 1235 syslog(LOG_WARNING, "setsockopt (IP_TOS): %m"); 1236 } 1237 #endif 1238 return (fdopen(s, mode)); 1239 bad: 1240 /* Return the real value of errno (close may change it) */ 1241 t = errno; 1242 (void) seteuid((uid_t)pw->pw_uid); 1243 (void) close(s); 1244 errno = t; 1245 return (NULL); 1246 } 1247 1248 static FILE * 1249 dataconn(const char *name, off_t size, const char *mode) 1250 { 1251 char sizebuf[32]; 1252 FILE *file; 1253 int retry = 0, tos, keepalive; 1254 1255 file_size = size; 1256 byte_count = 0; 1257 if (size != (off_t) -1) 1258 (void)snprintf(sizebuf, sizeof(sizebuf), " (%qd byte%s)", 1259 (qdfmt_t)size, PLURAL(size)); 1260 else 1261 sizebuf[0] = '\0'; 1262 if (pdata >= 0) { 1263 union sockunion from; 1264 int s, fromlen = sizeof(from); 1265 1266 (void) alarm(curclass.timeout); 1267 s = accept(pdata, (struct sockaddr *)&from, &fromlen); 1268 (void) alarm(0); 1269 if (s < 0) { 1270 reply(425, "Can't open data connection."); 1271 (void) close(pdata); 1272 pdata = -1; 1273 return (NULL); 1274 } 1275 (void) close(pdata); 1276 pdata = s; 1277 switch (from.su_family) { 1278 case AF_INET: 1279 #ifdef IP_TOS 1280 if (!mapped) { 1281 tos = IPTOS_THROUGHPUT; 1282 (void) setsockopt(s, IPPROTO_IP, IP_TOS, 1283 (char *)&tos, sizeof(int)); 1284 } 1285 break; 1286 #endif 1287 } 1288 /* Set keepalives on the socket to detect dropped conns. */ 1289 #ifdef SO_KEEPALIVE 1290 keepalive = 1; 1291 (void) setsockopt(s, SOL_SOCKET, SO_KEEPALIVE, 1292 (char *)&keepalive, sizeof(int)); 1293 #endif 1294 reply(150, "Opening %s mode data connection for '%s'%s.", 1295 type == TYPE_A ? "ASCII" : "BINARY", name, sizebuf); 1296 return (fdopen(pdata, mode)); 1297 } 1298 if (data >= 0) { 1299 reply(125, "Using existing data connection for '%s'%s.", 1300 name, sizebuf); 1301 usedefault = 1; 1302 return (fdopen(data, mode)); 1303 } 1304 if (usedefault) 1305 data_dest = his_addr; 1306 usedefault = 1; 1307 file = getdatasock(mode); 1308 if (file == NULL) { 1309 char hbuf[INET6_ADDRSTRLEN]; 1310 char pbuf[10]; 1311 getnameinfo((struct sockaddr *)&data_source, data_source.su_len, 1312 hbuf, sizeof(hbuf), pbuf, sizeof(pbuf), 1313 NI_NUMERICHOST | NI_NUMERICSERV); 1314 reply(425, "Can't create data socket (%s,%s): %s.", 1315 hbuf, pbuf, strerror(errno)); 1316 return (NULL); 1317 } 1318 data = fileno(file); 1319 while (connect(data, (struct sockaddr *)&data_dest, 1320 data_dest.su_len) < 0) { 1321 if (errno == EADDRINUSE && retry < swaitmax) { 1322 sleep((unsigned) swaitint); 1323 retry += swaitint; 1324 continue; 1325 } 1326 perror_reply(425, "Can't build data connection"); 1327 (void) fclose(file); 1328 data = -1; 1329 return (NULL); 1330 } 1331 reply(150, "Opening %s mode data connection for '%s'%s.", 1332 type == TYPE_A ? "ASCII" : "BINARY", name, sizebuf); 1333 return (file); 1334 } 1335 1336 /* 1337 * Tranfer the contents of "instr" to "outstr" peer using the appropriate 1338 * encapsulation of the data subject * to Mode, Structure, and Type. 1339 * 1340 * NB: Form isn't handled. 1341 */ 1342 static int 1343 send_data(FILE *instr, FILE *outstr, off_t blksize, int isdata) 1344 { 1345 int c, filefd, netfd, rval; 1346 char *buf; 1347 1348 transflag = 1; 1349 rval = -1; 1350 buf = NULL; 1351 if (setjmp(urgcatch)) 1352 goto cleanup_send_data; 1353 1354 switch (type) { 1355 1356 case TYPE_A: 1357 /* XXXX: rate limit ascii send (get) */ 1358 (void) alarm(curclass.timeout); 1359 while ((c = getc(instr)) != EOF) { 1360 byte_count++; 1361 if (c == '\n') { 1362 if (ferror(outstr)) 1363 goto data_err; 1364 (void) putc('\r', outstr); 1365 if (isdata) { 1366 total_data_out++; 1367 total_data++; 1368 } 1369 total_bytes_out++; 1370 total_bytes++; 1371 } 1372 (void) putc(c, outstr); 1373 if (isdata) { 1374 total_data_out++; 1375 total_data++; 1376 } 1377 total_bytes_out++; 1378 total_bytes++; 1379 if ((byte_count % 4096) == 0) 1380 (void) alarm(curclass.timeout); 1381 } 1382 (void) alarm(0); 1383 fflush(outstr); 1384 if (ferror(instr)) 1385 goto file_err; 1386 if (ferror(outstr)) 1387 goto data_err; 1388 rval = 0; 1389 goto cleanup_send_data; 1390 1391 case TYPE_I: 1392 case TYPE_L: 1393 if ((buf = malloc((size_t)blksize)) == NULL) { 1394 perror_reply(451, "Local resource failure: malloc"); 1395 goto cleanup_send_data; 1396 } 1397 filefd = fileno(instr); 1398 netfd = fileno(outstr); 1399 (void) alarm(curclass.timeout); 1400 if (curclass.rateget) { 1401 while (1) { 1402 int d; 1403 struct timeval then, now, td; 1404 off_t bufrem; 1405 char *bufp; 1406 1407 (void)gettimeofday(&then, NULL); 1408 errno = c = d = 0; 1409 bufrem = curclass.rateget; 1410 while (bufrem > 0) { 1411 if ((c = read(filefd, buf, 1412 MIN(blksize, bufrem))) <= 0) 1413 goto senddone; 1414 (void) alarm(curclass.timeout); 1415 bufrem -= c; 1416 byte_count += c; 1417 if (isdata) { 1418 total_data_out += c; 1419 total_data += c; 1420 } 1421 total_bytes_out += c; 1422 total_bytes += c; 1423 for (bufp = buf; c > 0; 1424 c -= d, bufp += d) 1425 if ((d = 1426 write(netfd, bufp, c)) <= 0) 1427 break; 1428 if (d < 0) 1429 goto data_err; 1430 } 1431 (void)gettimeofday(&now, NULL); 1432 timersub(&now, &then, &td); 1433 if (td.tv_sec > 0) 1434 break; 1435 usleep(1000000 - td.tv_usec); 1436 } 1437 } else { 1438 while ((c = read(filefd, buf, (size_t)blksize)) > 0) { 1439 if (write(netfd, buf, c) != c) 1440 goto data_err; 1441 (void) alarm(curclass.timeout); 1442 byte_count += c; 1443 if (isdata) { 1444 total_data_out += c; 1445 total_data += c; 1446 } 1447 total_bytes_out += c; 1448 total_bytes += c; 1449 } 1450 } 1451 senddone: 1452 if (c < 0) 1453 goto file_err; 1454 rval = 0; 1455 goto cleanup_send_data; 1456 1457 default: 1458 reply(550, "Unimplemented TYPE %d in send_data", type); 1459 goto cleanup_send_data; 1460 } 1461 1462 data_err: 1463 (void) alarm(0); 1464 perror_reply(426, "Data connection"); 1465 goto cleanup_send_data; 1466 1467 file_err: 1468 (void) alarm(0); 1469 perror_reply(551, "Error on input file"); 1470 /* FALLTHROUGH */ 1471 1472 cleanup_send_data: 1473 (void) alarm(0); 1474 transflag = 0; 1475 if (buf) 1476 free(buf); 1477 if (isdata) { 1478 total_files_out++; 1479 total_files++; 1480 } 1481 total_xfers_out++; 1482 total_xfers++; 1483 return (rval); 1484 } 1485 1486 /* 1487 * Transfer data from peer to "outstr" using the appropriate encapulation of 1488 * the data subject to Mode, Structure, and Type. 1489 * 1490 * N.B.: Form isn't handled. 1491 */ 1492 static int 1493 receive_data(FILE *instr, FILE *outstr) 1494 { 1495 int c, bare_lfs, netfd, filefd, rval; 1496 char buf[BUFSIZ]; 1497 #ifdef __GNUC__ 1498 (void) &bare_lfs; 1499 #endif 1500 1501 bare_lfs = 0; 1502 transflag = 1; 1503 rval = -1; 1504 if (setjmp(urgcatch)) 1505 goto cleanup_recv_data; 1506 1507 switch (type) { 1508 1509 case TYPE_I: 1510 case TYPE_L: 1511 netfd = fileno(instr); 1512 filefd = fileno(outstr); 1513 (void) alarm(curclass.timeout); 1514 if (curclass.rateput) { 1515 while (1) { 1516 int d; 1517 struct timeval then, now, td; 1518 off_t bufrem; 1519 1520 (void)gettimeofday(&then, NULL); 1521 errno = c = d = 0; 1522 for (bufrem = curclass.rateput; bufrem > 0; ) { 1523 if ((c = read(netfd, buf, 1524 MIN(sizeof(buf), bufrem))) <= 0) 1525 goto recvdone; 1526 if ((d = write(filefd, buf, c)) != c) 1527 goto recvdone; 1528 (void) alarm(curclass.timeout); 1529 bufrem -= c; 1530 byte_count += c; 1531 total_data_in += c; 1532 total_data += c; 1533 total_bytes_in += c; 1534 total_bytes += c; 1535 } 1536 (void)gettimeofday(&now, NULL); 1537 timersub(&now, &then, &td); 1538 if (td.tv_sec > 0) 1539 break; 1540 usleep(1000000 - td.tv_usec); 1541 } 1542 } else { 1543 while ((c = read(netfd, buf, sizeof(buf))) > 0) { 1544 if (write(filefd, buf, c) != c) 1545 goto file_err; 1546 (void) alarm(curclass.timeout); 1547 byte_count += c; 1548 total_data_in += c; 1549 total_data += c; 1550 total_bytes_in += c; 1551 total_bytes += c; 1552 } 1553 } 1554 recvdone: 1555 if (c < 0) 1556 goto data_err; 1557 rval = 0; 1558 goto cleanup_recv_data; 1559 1560 case TYPE_E: 1561 reply(553, "TYPE E not implemented."); 1562 goto cleanup_recv_data; 1563 1564 case TYPE_A: 1565 (void) alarm(curclass.timeout); 1566 /* XXXX: rate limit ascii receive (put) */ 1567 while ((c = getc(instr)) != EOF) { 1568 byte_count++; 1569 total_data_in++; 1570 total_data++; 1571 total_bytes_in++; 1572 total_bytes++; 1573 if ((byte_count % 4096) == 0) 1574 (void) alarm(curclass.timeout); 1575 if (c == '\n') 1576 bare_lfs++; 1577 while (c == '\r') { 1578 if (ferror(outstr)) 1579 goto data_err; 1580 if ((c = getc(instr)) != '\n') { 1581 byte_count++; 1582 total_data_in++; 1583 total_data++; 1584 total_bytes_in++; 1585 total_bytes++; 1586 if ((byte_count % 4096) == 0) 1587 (void) alarm(curclass.timeout); 1588 (void) putc ('\r', outstr); 1589 if (c == '\0' || c == EOF) 1590 goto contin2; 1591 } 1592 } 1593 (void) putc(c, outstr); 1594 contin2: ; 1595 } 1596 (void) alarm(0); 1597 fflush(outstr); 1598 if (ferror(instr)) 1599 goto data_err; 1600 if (ferror(outstr)) 1601 goto file_err; 1602 if (bare_lfs) { 1603 lreply(226, 1604 "WARNING! %d bare linefeeds received in ASCII mode", 1605 bare_lfs); 1606 lreply(0, "File may not have transferred correctly."); 1607 } 1608 rval = 0; 1609 goto cleanup_recv_data; 1610 1611 default: 1612 reply(550, "Unimplemented TYPE %d in receive_data", type); 1613 goto cleanup_recv_data; 1614 } 1615 1616 data_err: 1617 (void) alarm(0); 1618 perror_reply(426, "Data Connection"); 1619 goto cleanup_recv_data; 1620 1621 file_err: 1622 (void) alarm(0); 1623 perror_reply(452, "Error writing file"); 1624 goto cleanup_recv_data; 1625 1626 cleanup_recv_data: 1627 (void) alarm(0); 1628 transflag = 0; 1629 total_files_in++; 1630 total_files++; 1631 total_xfers_in++; 1632 total_xfers++; 1633 return (rval); 1634 } 1635 1636 void 1637 statfilecmd(const char *filename) 1638 { 1639 FILE *fin; 1640 int c; 1641 char *argv[] = { INTERNAL_LS, "-lgA", "", NULL }; 1642 1643 argv[2] = (char *)filename; 1644 fin = ftpd_popen(argv, "r", STDOUT_FILENO); 1645 lreply(211, "status of %s:", filename); 1646 while ((c = getc(fin)) != EOF) { 1647 if (c == '\n') { 1648 if (ferror(stdout)){ 1649 perror_reply(421, "control connection"); 1650 (void) ftpd_pclose(fin); 1651 dologout(1); 1652 /* NOTREACHED */ 1653 } 1654 if (ferror(fin)) { 1655 perror_reply(551, filename); 1656 (void) ftpd_pclose(fin); 1657 return; 1658 } 1659 (void) putchar('\r'); 1660 total_bytes++; 1661 total_bytes_out++; 1662 } 1663 (void) putchar(c); 1664 total_bytes++; 1665 total_bytes_out++; 1666 } 1667 (void) ftpd_pclose(fin); 1668 reply(211, "End of Status"); 1669 } 1670 1671 void 1672 statcmd(void) 1673 { 1674 union sockunion *su = NULL; 1675 static char ntop_buf[INET6_ADDRSTRLEN]; 1676 u_char *a, *p; 1677 int ispassive, af; 1678 off_t b, otbi, otbo, otb; 1679 1680 a = p = (u_char *)NULL; 1681 1682 lreply(211, "%s FTP server status:", hostname); 1683 lreply(0, "Version: %s", FTPD_VERSION); 1684 ntop_buf[0] = '\0'; 1685 if (!getnameinfo((struct sockaddr *)&his_addr, his_addr.su_len, 1686 ntop_buf, sizeof(ntop_buf), NULL, 0, NI_NUMERICHOST) 1687 && strcmp(remotehost, ntop_buf) != 0) { 1688 lreply(0, "Connected to %s (%s)", remotehost, ntop_buf); 1689 } else 1690 lreply(0, "Connected to %s", remotehost); 1691 if (logged_in) { 1692 if (curclass.type == CLASS_GUEST) 1693 lreply(0, "Logged in anonymously"); 1694 else 1695 lreply(0, "Logged in as %s%s", pw->pw_name, 1696 curclass.type == CLASS_CHROOT ? " (chroot)" : ""); 1697 } else if (askpasswd) 1698 lreply(0, "Waiting for password"); 1699 else 1700 lreply(0, "Waiting for user name"); 1701 b = printf(" TYPE: %s", typenames[type]); 1702 total_bytes += b; 1703 total_bytes_out += b; 1704 if (type == TYPE_A || type == TYPE_E) { 1705 b = printf(", FORM: %s", formnames[form]); 1706 total_bytes += b; 1707 total_bytes_out += b; 1708 } 1709 if (type == TYPE_L) { 1710 #if NBBY == 8 1711 b = printf(" %d", NBBY); 1712 #else 1713 /* XXX: `bytesize' needs to be defined in this case */ 1714 b = printf(" %d", bytesize); 1715 #endif 1716 total_bytes += b; 1717 total_bytes_out += b; 1718 } 1719 b = printf("; STRUcture: %s; transfer MODE: %s\r\n", 1720 strunames[stru], modenames[mode]); 1721 total_bytes += b; 1722 total_bytes_out += b; 1723 ispassive = 0; 1724 if (data != -1) { 1725 lreply(0, "Data connection open"); 1726 su = NULL; 1727 } else if (pdata != -1) { 1728 b = printf(" in Passive mode"); 1729 total_bytes += b; 1730 total_bytes_out += b; 1731 su = (union sockunion *)&pasv_addr; 1732 ispassive = 1; 1733 goto printaddr; 1734 } else if (usedefault == 0) { 1735 if (epsvall) { 1736 b = printf("211- EPSV only mode (EPSV ALL )\r\n"); 1737 total_bytes += b; 1738 total_bytes_out += b; 1739 goto epsvonly; 1740 } 1741 b = printf("211- %s", 1742 (data_dest.su_family == AF_INET) ? "PORT" : "LPRT"); 1743 total_bytes += b; 1744 total_bytes_out += b; 1745 su = (union sockunion *)&data_dest; 1746 printaddr: 1747 /* PASV/PORT */ 1748 if (su->su_family == AF_INET) { 1749 if (ispassive) 1750 b = printf("211- PASV "); 1751 else 1752 b = printf("211- PORT "); 1753 a = (u_char *) &su->su_sin.sin_addr; 1754 p = (u_char *) &su->su_sin.sin_port; 1755 #define UC(b) (((int) b) & 0xff) 1756 b += printf("(%d,%d,%d,%d,%d,%d)\r\n", 1757 UC(a[0]), UC(a[1]), UC(a[2]), UC(a[3]), 1758 UC(p[0]), UC(p[1])); 1759 total_bytes += b; 1760 total_bytes_out += b; 1761 } 1762 1763 /* LPSV/LPRT */ 1764 { 1765 int alen, af, i; 1766 1767 alen = 0; 1768 switch (su->su_family) { 1769 case AF_INET: 1770 a = (u_char *) &su->su_sin.sin_addr; 1771 p = (u_char *) &su->su_sin.sin_port; 1772 alen = sizeof(su->su_sin.sin_addr); 1773 af = 4; 1774 break; 1775 case AF_INET6: 1776 a = (u_char *) &su->su_sin6.sin6_addr; 1777 p = (u_char *) &su->su_sin6.sin6_port; 1778 alen = sizeof(su->su_sin6.sin6_addr); 1779 af = 6; 1780 break; 1781 default: 1782 af = 0; 1783 break; 1784 } 1785 if (af) { 1786 if (ispassive) 1787 b = printf("211- LPSV "); 1788 else 1789 b = printf("211- LPRT "); 1790 printf("(%d,%d", af, alen); 1791 for (i = 0; i < alen; i++) 1792 b += printf("%d,", UC(a[alen])); 1793 b += printf("%d,%d,%d)\r\n", 2, UC(p[0]), UC(p[1])); 1794 total_bytes += b; 1795 total_bytes_out += b; 1796 #undef UC 1797 } 1798 } 1799 1800 /* EPRT/EPSV */ 1801 epsvonly: 1802 switch (su->su_family) { 1803 case AF_INET: 1804 af = 1; 1805 break; 1806 case AF_INET6: 1807 af = 2; 1808 break; 1809 default: 1810 af = 0; 1811 break; 1812 } 1813 if (af) { 1814 if (getnameinfo((struct sockaddr *)su, su->su_len, 1815 ntop_buf, sizeof(ntop_buf), NULL, 0, 1816 NI_NUMERICHOST) == 0) { 1817 if (ispassive) 1818 b = printf("211 - EPSV "); 1819 else 1820 b = printf("211 - EPRT "); 1821 b += printf("(|%d|%s|%d|)\r\n", 1822 af, ntop_buf, ntohs(su->su_port)); 1823 total_bytes += b; 1824 total_bytes_out += b; 1825 } 1826 } 1827 } else 1828 lreply(0, "No data connection"); 1829 1830 if (logged_in) { 1831 lreply(0, "Data sent: %qd byte%s in %qd file%s", 1832 (qdfmt_t)total_data_out, PLURAL(total_data_out), 1833 (qdfmt_t)total_files_out, PLURAL(total_files_out)); 1834 lreply(0, "Data received: %qd byte%s in %qd file%s", 1835 (qdfmt_t)total_data_in, PLURAL(total_data_in), 1836 (qdfmt_t)total_files_in, PLURAL(total_files_in)); 1837 lreply(0, "Total data: %qd byte%s in %qd file%s", 1838 (qdfmt_t)total_data, PLURAL(total_data), 1839 (qdfmt_t)total_files, PLURAL(total_files)); 1840 } 1841 otbi = total_bytes_in; 1842 otbo = total_bytes_out; 1843 otb = total_bytes; 1844 lreply(0, "Traffic sent: %qd byte%s in %qd transfer%s", 1845 (qdfmt_t)otbo, PLURAL(otbo), 1846 (qdfmt_t)total_xfers_out, PLURAL(total_xfers_out)); 1847 lreply(0, "Traffic received: %qd byte%s in %qd transfer%s", 1848 (qdfmt_t)otbi, PLURAL(otbi), 1849 (qdfmt_t)total_xfers_in, PLURAL(total_xfers_in)); 1850 lreply(0, "Total traffic: %qd byte%s in %qd transfer%s", 1851 (qdfmt_t)otb, PLURAL(otb), 1852 (qdfmt_t)total_xfers, PLURAL(total_xfers)); 1853 1854 if (logged_in) { 1855 struct ftpconv *cp; 1856 1857 lreply(0, ""); 1858 lreply(0, "Class: %s, type: %s", 1859 curclass.classname, CURCLASSTYPE); 1860 lreply(0, "Check PORT/LPRT commands: %sabled", 1861 curclass.checkportcmd ? "en" : "dis"); 1862 if (curclass.display != NULL) 1863 lreply(0, "Display file: %s", curclass.display); 1864 if (curclass.notify != NULL) 1865 lreply(0, "Notify fileglob: %s", curclass.notify); 1866 lreply(0, "Idle timeout: %d, maximum timeout: %d", 1867 curclass.timeout, curclass.maxtimeout); 1868 lreply(0, "Current connections: %d", connections); 1869 if (curclass.limit == -1) 1870 lreply(0, "Maximum connections: unlimited"); 1871 else 1872 lreply(0, "Maximum connections: %d", curclass.limit); 1873 if (curclass.limitfile) 1874 lreply(0, "Connection limit exceeded file: %s", 1875 curclass.limitfile); 1876 if (curclass.motd != NULL) 1877 lreply(0, "MotD file: %s", curclass.motd); 1878 lreply(0, 1879 "Modify commands (CHMOD, DELE, MKD, RMD, RNFR, UMASK): %sabled", 1880 curclass.modify ? "en" : "dis"); 1881 lreply(0, 1882 "Upload commands (APPE, STOR, STOU): %sabled", 1883 curclass.upload ? "en" : "dis"); 1884 if (curclass.portmin && curclass.portmax) 1885 lreply(0, "PASV port range: %d - %d", 1886 curclass.portmin, curclass.portmax); 1887 if (curclass.rateget) 1888 lreply(0, "Rate get limit: %d bytes/sec", 1889 curclass.rateget); 1890 else 1891 lreply(0, "Rate get limit: disabled"); 1892 if (curclass.rateput) 1893 lreply(0, "Rate put limit: %d bytes/sec", 1894 curclass.rateput); 1895 else 1896 lreply(0, "Rate put limit: disabled"); 1897 lreply(0, "Umask: %.04o", curclass.umask); 1898 for (cp = curclass.conversions; cp != NULL; cp=cp->next) { 1899 if (cp->suffix == NULL || cp->types == NULL || 1900 cp->command == NULL) 1901 continue; 1902 lreply(0, 1903 "Conversion: %s [%s] disable: %s, command: %s", 1904 cp->suffix, cp->types, cp->disable, cp->command); 1905 } 1906 } 1907 1908 reply(211, "End of status"); 1909 } 1910 1911 void 1912 fatal(const char *s) 1913 { 1914 1915 reply(451, "Error in server: %s\n", s); 1916 reply(221, "Closing connection due to server error."); 1917 dologout(0); 1918 /* NOTREACHED */ 1919 } 1920 1921 void 1922 reply(int n, const char *fmt, ...) 1923 { 1924 off_t b; 1925 va_list ap; 1926 1927 va_start(ap, fmt); 1928 b = 0; 1929 b += printf("%d ", n); 1930 b += vprintf(fmt, ap); 1931 b += printf("\r\n"); 1932 total_bytes += b; 1933 total_bytes_out += b; 1934 (void)fflush(stdout); 1935 if (debug) { 1936 syslog(LOG_DEBUG, "<--- %d ", n); 1937 vsyslog(LOG_DEBUG, fmt, ap); 1938 } 1939 } 1940 1941 void 1942 lreply(int n, const char *fmt, ...) 1943 { 1944 off_t b; 1945 va_list ap; 1946 1947 va_start(ap, fmt); 1948 b = 0; 1949 switch (n) { 1950 case 0: 1951 b += printf(" "); 1952 case -1: 1953 break; 1954 default: 1955 b += printf("%d-", n); 1956 break; 1957 } 1958 b += vprintf(fmt, ap); 1959 b += printf("\r\n"); 1960 total_bytes += b; 1961 total_bytes_out += b; 1962 (void)fflush(stdout); 1963 if (debug) { 1964 syslog(LOG_DEBUG, "<--- %d- ", n); 1965 vsyslog(LOG_DEBUG, fmt, ap); 1966 } 1967 } 1968 1969 static void 1970 ack(const char *s) 1971 { 1972 1973 reply(250, "%s command successful.", s); 1974 } 1975 1976 void 1977 delete(const char *name) 1978 { 1979 char *p = NULL; 1980 1981 if (remove(name) < 0) { 1982 p = strerror(errno); 1983 perror_reply(550, name); 1984 } else 1985 ack("DELE"); 1986 logcmd("delete", -1, name, NULL, NULL, p); 1987 } 1988 1989 void 1990 cwd(const char *path) 1991 { 1992 1993 if (chdir(path) < 0) 1994 perror_reply(550, path); 1995 else { 1996 show_chdir_messages(250); 1997 ack("CWD"); 1998 } 1999 } 2000 2001 static void 2002 replydirname(const char *name, const char *message) 2003 { 2004 char npath[MAXPATHLEN]; 2005 int i; 2006 2007 for (i = 0; *name != '\0' && i < sizeof(npath) - 1; i++, name++) { 2008 npath[i] = *name; 2009 if (*name == '"') 2010 npath[++i] = '"'; 2011 } 2012 npath[i] = '\0'; 2013 reply(257, "\"%s\" %s", npath, message); 2014 } 2015 2016 void 2017 makedir(const char *name) 2018 { 2019 char *p = NULL; 2020 2021 if (mkdir(name, 0777) < 0) { 2022 p = strerror(errno); 2023 perror_reply(550, name); 2024 } else 2025 replydirname(name, "directory created."); 2026 logcmd("mkdir", -1, name, NULL, NULL, p); 2027 } 2028 2029 void 2030 removedir(const char *name) 2031 { 2032 char *p = NULL; 2033 2034 if (rmdir(name) < 0) { 2035 p = strerror(errno); 2036 perror_reply(550, name); 2037 } else 2038 ack("RMD"); 2039 logcmd("rmdir", -1, name, NULL, NULL, p); 2040 } 2041 2042 void 2043 pwd(void) 2044 { 2045 char path[MAXPATHLEN]; 2046 2047 if (getcwd(path, sizeof(path) - 1) == NULL) 2048 reply(550, "Can't get the current directory: %s.", 2049 strerror(errno)); 2050 else 2051 replydirname(path, "is the current directory."); 2052 } 2053 2054 char * 2055 renamefrom(const char *name) 2056 { 2057 struct stat st; 2058 2059 if (stat(name, &st) < 0) { 2060 perror_reply(550, name); 2061 return (NULL); 2062 } 2063 reply(350, "File exists, ready for destination name"); 2064 return (xstrdup(name)); 2065 } 2066 2067 void 2068 renamecmd(const char *from, const char *to) 2069 { 2070 char *p = NULL; 2071 2072 if (rename(from, to) < 0) { 2073 p = strerror(errno); 2074 perror_reply(550, "rename"); 2075 } else 2076 ack("RNTO"); 2077 logcmd("rename", -1, from, to, NULL, p); 2078 } 2079 2080 static void 2081 dolog(struct sockaddr *who) 2082 { 2083 getnameinfo(who, who->sa_len, remotehost, sizeof(remotehost), NULL,0,0); 2084 #ifdef HASSETPROCTITLE 2085 snprintf(proctitle, sizeof(proctitle), "%s: connected", remotehost); 2086 setproctitle(proctitle); 2087 #endif /* HASSETPROCTITLE */ 2088 if (logging) 2089 syslog(LOG_INFO, "connection from %s to %s", 2090 remotehost, hostname); 2091 } 2092 2093 /* 2094 * Record logout in wtmp file 2095 * and exit with supplied status. 2096 */ 2097 void 2098 dologout(int status) 2099 { 2100 /* 2101 * Prevent reception of SIGURG from resulting in a resumption 2102 * back to the main program loop. 2103 */ 2104 transflag = 0; 2105 2106 if (logged_in) { 2107 (void) seteuid((uid_t)0); 2108 logwtmp(ttyline, "", ""); 2109 if (doutmp) 2110 logout(utmp.ut_line); 2111 #ifdef KERBEROS 2112 if (!notickets && krbtkfile_env) 2113 unlink(krbtkfile_env); 2114 #endif 2115 } 2116 /* beware of flushing buffers after a SIGPIPE */ 2117 _exit(status); 2118 } 2119 2120 static void 2121 myoob(int signo) 2122 { 2123 char *cp; 2124 2125 /* only process if transfer occurring */ 2126 if (!transflag) 2127 return; 2128 cp = tmpline; 2129 if (getline(cp, 7, stdin) == NULL) { 2130 reply(221, "You could at least say goodbye."); 2131 dologout(0); 2132 } 2133 if (strcasecmp(cp, "ABOR\r\n") == 0) { 2134 tmpline[0] = '\0'; 2135 reply(426, "Transfer aborted. Data connection closed."); 2136 reply(226, "Abort successful"); 2137 longjmp(urgcatch, 1); 2138 } 2139 if (strcasecmp(cp, "STAT\r\n") == 0) { 2140 tmpline[0] = '\0'; 2141 if (file_size != (off_t) -1) 2142 reply(213, "Status: %qd of %qd byte%s transferred", 2143 (qdfmt_t)byte_count, (qdfmt_t)file_size, 2144 PLURAL(byte_count)); 2145 else 2146 reply(213, "Status: %qd byte%s transferred", 2147 (qdfmt_t)byte_count, PLURAL(byte_count)); 2148 } 2149 } 2150 2151 static int 2152 bind_pasv_addr(void) 2153 { 2154 static int passiveport; 2155 int port, len; 2156 2157 len = pasv_addr.su_len; 2158 if (curclass.portmin == 0 && curclass.portmax == 0) { 2159 pasv_addr.su_port = 0; 2160 return (bind(pdata, (struct sockaddr *)&pasv_addr, len)); 2161 } 2162 2163 if (passiveport == 0) { 2164 srand(getpid()); 2165 passiveport = rand() % (curclass.portmax - curclass.portmin) 2166 + curclass.portmin; 2167 } 2168 2169 port = passiveport; 2170 while (1) { 2171 port++; 2172 if (port > curclass.portmax) 2173 port = curclass.portmin; 2174 else if (port == passiveport) { 2175 errno = EAGAIN; 2176 return (-1); 2177 } 2178 pasv_addr.su_port = htons(port); 2179 if (bind(pdata, (struct sockaddr *)&pasv_addr, len) == 0) 2180 break; 2181 if (errno != EADDRINUSE) 2182 return (-1); 2183 } 2184 passiveport = port; 2185 return (0); 2186 } 2187 2188 /* 2189 * Note: a response of 425 is not mentioned as a possible response to 2190 * the PASV command in RFC959. However, it has been blessed as 2191 * a legitimate response by Jon Postel in a telephone conversation 2192 * with Rick Adams on 25 Jan 89. 2193 */ 2194 void 2195 passive(void) 2196 { 2197 int len; 2198 char *p, *a; 2199 2200 if (pdata >= 0) 2201 close(pdata); 2202 pdata = socket(AF_INET, SOCK_STREAM, 0); 2203 if (pdata < 0 || !logged_in) { 2204 perror_reply(425, "Can't open passive connection"); 2205 return; 2206 } 2207 pasv_addr = ctrl_addr; 2208 2209 if (bind_pasv_addr() < 0) 2210 goto pasv_error; 2211 len = pasv_addr.su_len; 2212 if (getsockname(pdata, (struct sockaddr *) &pasv_addr, &len) < 0) 2213 goto pasv_error; 2214 if (listen(pdata, 1) < 0) 2215 goto pasv_error; 2216 a = (char *) &pasv_addr.su_sin.sin_addr; 2217 p = (char *) &pasv_addr.su_port; 2218 2219 #define UC(b) (((int) b) & 0xff) 2220 2221 reply(227, "Entering Passive Mode (%d,%d,%d,%d,%d,%d)", UC(a[0]), 2222 UC(a[1]), UC(a[2]), UC(a[3]), UC(p[0]), UC(p[1])); 2223 return; 2224 2225 pasv_error: 2226 (void) close(pdata); 2227 pdata = -1; 2228 perror_reply(425, "Can't open passive connection"); 2229 return; 2230 } 2231 2232 /* 2233 * 228 Entering Long Passive Mode (af, hal, h1, h2, h3,..., pal, p1, p2...) 2234 * 229 Entering Extended Passive Mode (|||port|) 2235 */ 2236 void 2237 long_passive(char *cmd, int pf) 2238 { 2239 int len; 2240 char *p, *a; 2241 2242 if (!logged_in) { 2243 syslog(LOG_NOTICE, "long passive but not logged in"); 2244 reply(503, "Login with USER first."); 2245 return; 2246 } 2247 2248 if (pf != PF_UNSPEC) { 2249 if (ctrl_addr.su_family != pf) { 2250 switch (ctrl_addr.su_family) { 2251 case AF_INET: 2252 pf = 1; 2253 break; 2254 case AF_INET6: 2255 pf = 2; 2256 break; 2257 default: 2258 pf = 0; 2259 break; 2260 } 2261 /* 2262 * XXX 2263 * only EPRT/EPSV ready clients will understand this 2264 */ 2265 if (strcmp(cmd, "EPSV") == 0 && pf) { 2266 reply(522, "Network protocol mismatch, " 2267 "use (%d)", pf); 2268 } else 2269 reply(501, "Network protocol mismatch"); /*XXX*/ 2270 2271 return; 2272 } 2273 } 2274 2275 if (pdata >= 0) 2276 close(pdata); 2277 pdata = socket(ctrl_addr.su_family, SOCK_STREAM, 0); 2278 if (pdata < 0) { 2279 perror_reply(425, "Can't open passive connection"); 2280 return; 2281 } 2282 pasv_addr = ctrl_addr; 2283 if (bind_pasv_addr() < 0) 2284 goto pasv_error; 2285 len = pasv_addr.su_len; 2286 if (getsockname(pdata, (struct sockaddr *) &pasv_addr, &len) < 0) 2287 goto pasv_error; 2288 if (listen(pdata, 1) < 0) 2289 goto pasv_error; 2290 p = (char *) &pasv_addr.su_port; 2291 2292 #define UC(b) (((int) b) & 0xff) 2293 2294 if (strcmp(cmd, "LPSV") == 0) { 2295 switch (pasv_addr.su_family) { 2296 case AF_INET: 2297 a = (char *) &pasv_addr.su_sin.sin_addr; 2298 reply(228, "Entering Long Passive Mode (%d,%d,%d,%d,%d,%d,%d,%d,%d)", 2299 4, 4, UC(a[0]), UC(a[1]), UC(a[2]), UC(a[3]), 2300 2, UC(p[0]), UC(p[1])); 2301 return; 2302 case AF_INET6: 2303 a = (char *) &pasv_addr.su_sin6.sin6_addr; 2304 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)", 2305 6, 16, 2306 UC(a[0]), UC(a[1]), UC(a[2]), UC(a[3]), 2307 UC(a[4]), UC(a[5]), UC(a[6]), UC(a[7]), 2308 UC(a[8]), UC(a[9]), UC(a[10]), UC(a[11]), 2309 UC(a[12]), UC(a[13]), UC(a[14]), UC(a[15]), 2310 2, UC(p[0]), UC(p[1])); 2311 return; 2312 } 2313 #undef UC 2314 } else if (strcmp(cmd, "EPSV") == 0) { 2315 switch (pasv_addr.su_family) { 2316 case AF_INET: 2317 case AF_INET6: 2318 reply(229, "Entering Extended Passive Mode (|||%d|)", 2319 ntohs(pasv_addr.su_port)); 2320 return; 2321 } 2322 } else { 2323 /* more proper error code? */ 2324 } 2325 2326 pasv_error: 2327 (void) close(pdata); 2328 pdata = -1; 2329 perror_reply(425, "Can't open passive connection"); 2330 return; 2331 } 2332 2333 /* 2334 * Generate unique name for file with basename "local". 2335 * The file named "local" is already known to exist. 2336 * Generates failure reply on error. 2337 * 2338 * XXX this function should under go changes similar to 2339 * the mktemp(3)/mkstemp(3) changes. 2340 */ 2341 static char * 2342 gunique(const char *local) 2343 { 2344 static char new[MAXPATHLEN]; 2345 struct stat st; 2346 char *cp; 2347 int count; 2348 2349 cp = strrchr(local, '/'); 2350 if (cp) 2351 *cp = '\0'; 2352 if (stat(cp ? local : ".", &st) < 0) { 2353 perror_reply(553, cp ? local : "."); 2354 return (NULL); 2355 } 2356 if (cp) 2357 *cp = '/'; 2358 for (count = 1; count < 100; count++) { 2359 (void)snprintf(new, sizeof(new) - 1, "%s.%d", local, count); 2360 if (stat(new, &st) < 0) 2361 return (new); 2362 } 2363 reply(452, "Unique file name cannot be created."); 2364 return (NULL); 2365 } 2366 2367 /* 2368 * Format and send reply containing system error number. 2369 */ 2370 void 2371 perror_reply(int code, const char *string) 2372 { 2373 int save_errno; 2374 2375 save_errno = errno; 2376 reply(code, "%s: %s.", string, strerror(errno)); 2377 errno = save_errno; 2378 } 2379 2380 static char *onefile[] = { 2381 "", 2382 0 2383 }; 2384 2385 void 2386 send_file_list(const char *whichf) 2387 { 2388 struct stat st; 2389 DIR *dirp = NULL; 2390 struct dirent *dir; 2391 FILE *dout = NULL; 2392 char **dirlist, *dirname, *p; 2393 int simple = 0; 2394 int freeglob = 0; 2395 glob_t gl; 2396 off_t b; 2397 2398 #ifdef __GNUC__ 2399 (void) &dout; 2400 (void) &dirlist; 2401 (void) &simple; 2402 (void) &freeglob; 2403 #endif 2404 2405 p = NULL; 2406 if (strpbrk(whichf, "~{[*?") != NULL) { 2407 int flags = GLOB_BRACE|GLOB_NOCHECK|GLOB_TILDE; 2408 2409 memset(&gl, 0, sizeof(gl)); 2410 freeglob = 1; 2411 if (glob(whichf, flags, 0, &gl)) { 2412 reply(550, "not found"); 2413 goto out; 2414 } else if (gl.gl_pathc == 0) { 2415 errno = ENOENT; 2416 perror_reply(550, whichf); 2417 goto out; 2418 } 2419 dirlist = gl.gl_pathv; 2420 } else { 2421 p = xstrdup(whichf); 2422 onefile[0] = p; 2423 dirlist = onefile; 2424 simple = 1; 2425 } 2426 /* XXX: } for vi sm */ 2427 2428 if (setjmp(urgcatch)) { 2429 transflag = 0; 2430 goto out; 2431 } 2432 while ((dirname = *dirlist++) != NULL) { 2433 int trailingslash = 0; 2434 2435 if (stat(dirname, &st) < 0) { 2436 /* 2437 * If user typed "ls -l", etc, and the client 2438 * used NLST, do what the user meant. 2439 */ 2440 /* XXX: nuke this support? */ 2441 if (dirname[0] == '-' && *dirlist == NULL && 2442 transflag == 0) { 2443 char *argv[] = { INTERNAL_LS, "", NULL }; 2444 2445 argv[1] = dirname; 2446 retrieve(argv, dirname); 2447 goto out; 2448 } 2449 perror_reply(550, whichf); 2450 if (dout != NULL) { 2451 (void) fclose(dout); 2452 transflag = 0; 2453 data = -1; 2454 if (pdata >= 0) 2455 (void)close(pdata); 2456 pdata = -1; 2457 } 2458 goto out; 2459 } 2460 2461 if (S_ISREG(st.st_mode)) { 2462 if (dout == NULL) { 2463 dout = dataconn("file list", (off_t)-1, "w"); 2464 if (dout == NULL) 2465 goto out; 2466 transflag++; 2467 } 2468 b = fprintf(dout, "%s%s\n", dirname, 2469 type == TYPE_A ? "\r" : ""); 2470 total_bytes += b; 2471 total_bytes_out += b; 2472 byte_count += strlen(dirname) + 1; 2473 continue; 2474 } else if (!S_ISDIR(st.st_mode)) 2475 continue; 2476 2477 if (dirname[strlen(dirname) - 1] == '/') 2478 trailingslash++; 2479 2480 if ((dirp = opendir(dirname)) == NULL) 2481 continue; 2482 2483 while ((dir = readdir(dirp)) != NULL) { 2484 char nbuf[MAXPATHLEN]; 2485 2486 if (dir->d_name[0] == '.' && dir->d_namlen == 1) 2487 continue; 2488 if (dir->d_name[0] == '.' && dir->d_name[1] == '.' && 2489 dir->d_namlen == 2) 2490 continue; 2491 2492 (void)snprintf(nbuf, sizeof(nbuf), "%s%s%s", dirname, 2493 trailingslash ? "" : "/", dir->d_name); 2494 2495 /* 2496 * We have to do a stat to ensure it's 2497 * not a directory or special file. 2498 */ 2499 /* XXX: follow RFC959 and filter out non files ? */ 2500 if (simple || (stat(nbuf, &st) == 0 && 2501 S_ISREG(st.st_mode))) { 2502 char *p; 2503 2504 if (dout == NULL) { 2505 dout = dataconn("file list", (off_t)-1, 2506 "w"); 2507 if (dout == NULL) 2508 goto out; 2509 transflag++; 2510 } 2511 p = nbuf; 2512 if (nbuf[0] == '.' && nbuf[1] == '/') 2513 p = &nbuf[2]; 2514 b = fprintf(dout, "%s%s\n", p, 2515 type == TYPE_A ? "\r" : ""); 2516 total_bytes += b; 2517 total_bytes_out += b; 2518 byte_count += strlen(nbuf) + 1; 2519 } 2520 } 2521 (void) closedir(dirp); 2522 } 2523 2524 if (dout == NULL) 2525 reply(550, "No files found."); 2526 else if (ferror(dout) != 0) 2527 perror_reply(550, "Data connection"); 2528 else 2529 reply(226, "Transfer complete."); 2530 2531 transflag = 0; 2532 if (dout != NULL) 2533 (void) fclose(dout); 2534 else if (pdata >= 0) 2535 (void)close(pdata); 2536 data = -1; 2537 pdata = -1; 2538 out: 2539 total_xfers++; 2540 total_xfers_out++; 2541 if (p) 2542 free(p); 2543 if (freeglob) 2544 globfree(&gl); 2545 } 2546 2547 char * 2548 conffilename(const char *s) 2549 { 2550 static char filename[MAXPATHLEN]; 2551 2552 if (*s == '/') 2553 strlcpy(filename, s, sizeof(filename)); 2554 else 2555 (void)snprintf(filename, sizeof(filename), "%s/%s", confdir ,s); 2556 return (filename); 2557 } 2558 2559 /* 2560 * logcmd -- 2561 * based on the arguments, syslog a message: 2562 * if bytes != -1 "<command> <file1> = <bytes> bytes" 2563 * else if file2 != NULL "<command> <file1> <file2>" 2564 * else "<command> <file1>" 2565 * if elapsed != NULL, append "in xxx.yyy seconds" 2566 * if error != NULL, append ": " + error 2567 */ 2568 2569 void 2570 logcmd(const char *command, off_t bytes, const char *file1, const char *file2, 2571 const struct timeval *elapsed, const char *error) 2572 { 2573 char buf[MAXPATHLEN * 2 + 100], realfile[MAXPATHLEN]; 2574 const char *p; 2575 size_t len; 2576 2577 if (logging <=1) 2578 return; 2579 2580 if ((p = realpath(file1, realfile)) == NULL) { 2581 #if 0 /* XXX: too noisy */ 2582 syslog(LOG_WARNING, "realpath `%s' failed: %s", 2583 realfile, strerror(errno)); 2584 #endif 2585 p = file1; 2586 } 2587 len = snprintf(buf, sizeof(buf), "%s %s", command, p); 2588 2589 if (bytes != (off_t)-1) { 2590 len += snprintf(buf + len, sizeof(buf) - len, 2591 " = %qd byte%s", (qdfmt_t) bytes, PLURAL(bytes)); 2592 } else if (file2 != NULL) { 2593 if ((p = realpath(file2, realfile)) == NULL) { 2594 #if 0 /* XXX: too noisy */ 2595 syslog(LOG_WARNING, "realpath `%s' failed: %s", 2596 realfile, strerror(errno)); 2597 #endif 2598 p = file2; 2599 } 2600 len += snprintf(buf + len, sizeof(buf) - len, " %s", p); 2601 } 2602 2603 if (elapsed != NULL) { 2604 len += snprintf(buf + len, sizeof(buf) - len, 2605 " in %ld.%.03d seconds", elapsed->tv_sec, 2606 (int)(elapsed->tv_usec / 1000)); 2607 } 2608 2609 if (error != NULL) 2610 len += snprintf(buf + len, sizeof(buf) - len, ": %s", error); 2611 2612 syslog(LOG_INFO, "%s", buf); 2613 } 2614 2615 char * 2616 xstrdup(const char *s) 2617 { 2618 char *new = strdup(s); 2619 2620 if (new == NULL) 2621 fatal("Local resource failure: malloc"); 2622 /* NOTREACHED */ 2623 return (new); 2624 } 2625
Indexes created Fri Sep 26 20:09:58 GMT 2025