ftpd.c revision 1.85
1 /* $NetBSD: ftpd.c,v 1.85 2000/01/13 00:04:31 lukem 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 1.85 2000/01/13 00:04:31 lukem 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 <kerberosIV/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 #if __STDC__ 169 #include <stdarg.h> 170 #else 171 #include <varargs.h> 172 #endif 173 174 const char version[] = FTPD_VERSION; 175 176 union sockunion ctrl_addr; 177 union sockunion data_source; 178 union sockunion data_dest; 179 union sockunion his_addr; 180 union sockunion pasv_addr; 181 182 int data; 183 jmp_buf errcatch, urgcatch; 184 int logged_in; 185 int connections = 1; 186 struct passwd *pw; 187 int debug; 188 int sflag; 189 int logging; 190 int type; 191 int form; 192 int stru; /* avoid C keyword */ 193 int mode; 194 int doutmp = 0; /* update utmp file */ 195 int usedefault = 1; /* for data transfers */ 196 int pdata = -1; /* for passive mode */ 197 int mapped = 0; /* IPv4 connection on AF_INET6 socket */ 198 sig_atomic_t transflag; 199 off_t file_size; 200 off_t byte_count; 201 char tmpline[7]; 202 char hostname[MAXHOSTNAMELEN+1]; 203 char remotehost[MAXHOSTNAMELEN+1]; 204 static char ttyline[20]; 205 char *tty = ttyline; /* for klogin */ 206 static struct utmp utmp; /* for utmp */ 207 208 off_t total_data_in; /* total file data bytes received */ 209 off_t total_data_out; /* total file data bytes sent data */ 210 off_t total_data; /* total file data bytes transferred data */ 211 off_t total_files_in; /* total number of data files received */ 212 off_t total_files_out; /* total number of data files sent */ 213 off_t total_files; /* total number of data files transferred */ 214 off_t total_bytes_in; /* total bytes received */ 215 off_t total_bytes_out; /* total bytes sent */ 216 off_t total_bytes; /* total bytes transferred */ 217 off_t total_xfers_in; /* total number of xfers incoming */ 218 off_t total_xfers_out; /* total number of xfers outgoing */ 219 off_t total_xfers; /* total number of xfers */ 220 221 static char *anondir = NULL; 222 static char confdir[MAXPATHLEN]; 223 224 #if defined(KERBEROS) || defined(KERBEROS5) 225 int notickets = 1; 226 char *krbtkfile_env = NULL; 227 #endif 228 229 int epsvall = 0; 230 231 /* 232 * Timeout intervals for retrying connections 233 * to hosts that don't accept PORT cmds. This 234 * is a kludge, but given the problems with TCP... 235 */ 236 #define SWAITMAX 90 /* wait at most 90 seconds */ 237 #define SWAITINT 5 /* interval between retries */ 238 239 int swaitmax = SWAITMAX; 240 int swaitint = SWAITINT; 241 242 #ifdef HASSETPROCTITLE 243 char proctitle[BUFSIZ]; /* initial part of title */ 244 #endif /* HASSETPROCTITLE */ 245 246 #define CURCLASSTYPE curclass.type == CLASS_GUEST ? "GUEST" : \ 247 curclass.type == CLASS_CHROOT ? "CHROOT" : \ 248 curclass.type == CLASS_REAL ? "REAL" : \ 249 "<unknown>" 250 251 static void ack __P((const char *)); 252 static int bind_pasv_addr __P((void)); 253 static int checkuser __P((const char *, const char *, int, int, char **)); 254 static int checkaccess __P((const char *)); 255 static FILE *dataconn __P((const char *, off_t, const char *)); 256 static void dolog __P((struct sockaddr *)); 257 static void end_login __P((void)); 258 static FILE *getdatasock __P((const char *)); 259 static char *gunique __P((const char *)); 260 static void lostconn __P((int)); 261 static void myoob __P((int)); 262 static int receive_data __P((FILE *, FILE *)); 263 static void replydirname __P((const char *, const char *)); 264 static int send_data __P((FILE *, FILE *, off_t, int)); 265 static struct passwd * 266 sgetpwnam __P((const char *)); 267 268 int main __P((int, char *[])); 269 270 #if defined(KERBEROS) || defined(KERBEROS5) 271 int klogin __P((struct passwd *, char *, char *, char *)); 272 void kdestroy __P((void)); 273 #endif 274 275 int 276 main(argc, argv) 277 int argc; 278 char *argv[]; 279 { 280 int addrlen, ch, on = 1, tos, keepalive; 281 #ifdef KERBEROS5 282 krb5_error_code kerror; 283 #endif 284 285 debug = 0; 286 logging = 0; 287 sflag = 0; 288 (void)strcpy(confdir, _DEFAULT_CONFDIR); 289 hostname[0] = '\0'; 290 291 while ((ch = getopt(argc, argv, "a:c:C:dh:lst:T:u:Uv")) != -1) { 292 switch (ch) { 293 case 'a': 294 anondir = optarg; 295 break; 296 297 case 'c': 298 (void)strlcpy(confdir, optarg, sizeof(confdir)); 299 break; 300 301 case 'C': 302 pw = sgetpwnam(optarg); 303 exit(checkaccess(optarg) ? 0 : 1); 304 /* NOTREACHED */ 305 306 case 'd': 307 case 'v': /* deprecated */ 308 debug = 1; 309 break; 310 311 case 'h': 312 strlcpy(hostname, optarg, sizeof(hostname)); 313 break; 314 315 case 'l': 316 logging++; /* > 1 == extra logging */ 317 break; 318 319 case 's': 320 sflag = 1; 321 break; 322 323 case 't': 324 case 'T': 325 case 'u': 326 warnx("-%c has been deprecated in favour of ftpd.conf", 327 ch); 328 break; 329 330 case 'U': 331 doutmp = 1; 332 break; 333 334 default: 335 if (optopt == 'a' || optopt == 'C') 336 exit(1); 337 warnx("unknown flag -%c ignored", optopt); 338 break; 339 } 340 } 341 342 /* 343 * LOG_NDELAY sets up the logging connection immediately, 344 * necessary for anonymous ftp's that chroot and can't do it later. 345 */ 346 openlog("ftpd", LOG_PID | LOG_NDELAY, LOG_FTP); 347 addrlen = sizeof(his_addr); /* xxx */ 348 if (getpeername(0, (struct sockaddr *)&his_addr, &addrlen) < 0) { 349 syslog(LOG_ERR, "getpeername (%s): %m",argv[0]); 350 exit(1); 351 } 352 addrlen = sizeof(ctrl_addr); 353 if (getsockname(0, (struct sockaddr *)&ctrl_addr, &addrlen) < 0) { 354 syslog(LOG_ERR, "getsockname (%s): %m",argv[0]); 355 exit(1); 356 } 357 if (his_addr.su_family == AF_INET6 358 && IN6_IS_ADDR_V4MAPPED(&his_addr.su_sin6.sin6_addr)) { 359 #if 1 360 /* 361 * IPv4 control connection arrived to AF_INET6 socket. 362 * I hate to do this, but this is the easiest solution. 363 */ 364 union sockunion tmp_addr; 365 const int off = sizeof(struct in6_addr) - sizeof(struct in_addr); 366 367 tmp_addr = his_addr; 368 memset(&his_addr, 0, sizeof(his_addr)); 369 his_addr.su_sin.sin_family = AF_INET; 370 his_addr.su_sin.sin_len = sizeof(his_addr.su_sin); 371 memcpy(&his_addr.su_sin.sin_addr, 372 &tmp_addr.su_sin6.sin6_addr.s6_addr[off], 373 sizeof(his_addr.su_sin.sin_addr)); 374 his_addr.su_sin.sin_port = tmp_addr.su_sin6.sin6_port; 375 376 tmp_addr = ctrl_addr; 377 memset(&ctrl_addr, 0, sizeof(ctrl_addr)); 378 ctrl_addr.su_sin.sin_family = AF_INET; 379 ctrl_addr.su_sin.sin_len = sizeof(ctrl_addr.su_sin); 380 memcpy(&ctrl_addr.su_sin.sin_addr, 381 &tmp_addr.su_sin6.sin6_addr.s6_addr[off], 382 sizeof(ctrl_addr.su_sin.sin_addr)); 383 ctrl_addr.su_sin.sin_port = tmp_addr.su_sin6.sin6_port; 384 #else 385 while (fgets(line, sizeof(line), fd) != NULL) { 386 if ((cp = strchr(line, '\n')) != NULL) 387 *cp = '\0'; 388 lreply(530, "%s", line); 389 } 390 (void) fflush(stdout); 391 (void) fclose(fd); 392 reply(530, 393 "Connection from IPv4 mapped address is not supported."); 394 exit(0); 395 #endif 396 397 mapped = 1; 398 } else 399 mapped = 0; 400 #ifdef IP_TOS 401 if (!mapped && his_addr.su_family == AF_INET) { 402 tos = IPTOS_LOWDELAY; 403 if (setsockopt(0, IPPROTO_IP, IP_TOS, (char *)&tos, 404 sizeof(int)) < 0) 405 syslog(LOG_WARNING, "setsockopt (IP_TOS): %m"); 406 } 407 #endif 408 data_source.su_port = htons(ntohs(ctrl_addr.su_port) - 1); 409 410 /* if the hostname hasn't been given, attempt to determine it */ 411 if (hostname[0] == '\0') { 412 if (getnameinfo((struct sockaddr *)&ctrl_addr, ctrl_addr.su_len, 413 hostname, sizeof(hostname), NULL, 0, 0) != 0) 414 (void)gethostname(hostname, sizeof(hostname)); 415 hostname[sizeof(hostname) - 1] = '\0'; 416 } 417 418 /* set this here so klogin can use it... */ 419 (void)snprintf(ttyline, sizeof(ttyline), "ftp%d", getpid()); 420 421 (void) freopen(_PATH_DEVNULL, "w", stderr); 422 (void) signal(SIGPIPE, lostconn); 423 (void) signal(SIGCHLD, SIG_IGN); 424 if (signal(SIGURG, myoob) == SIG_ERR) 425 syslog(LOG_ERR, "signal: %m"); 426 427 /* Try to handle urgent data inline */ 428 #ifdef SO_OOBINLINE 429 if (setsockopt(0, SOL_SOCKET, SO_OOBINLINE, (char *)&on, sizeof(on)) < 0) 430 syslog(LOG_ERR, "setsockopt: %m"); 431 #endif 432 /* Set keepalives on the socket to detect dropped connections. */ 433 #ifdef SO_KEEPALIVE 434 keepalive = 1; 435 if (setsockopt(0, SOL_SOCKET, SO_KEEPALIVE, (char *)&keepalive, 436 sizeof(int)) < 0) 437 syslog(LOG_WARNING, "setsockopt (SO_KEEPALIVE): %m"); 438 #endif 439 440 #ifdef F_SETOWN 441 if (fcntl(fileno(stdin), F_SETOWN, getpid()) == -1) 442 syslog(LOG_ERR, "fcntl F_SETOWN: %m"); 443 #endif 444 dolog((struct sockaddr *)&his_addr); 445 /* 446 * Set up default state 447 */ 448 data = -1; 449 type = TYPE_A; 450 form = FORM_N; 451 stru = STRU_F; 452 mode = MODE_S; 453 tmpline[0] = '\0'; 454 hasyyerrored = 0; 455 456 #ifdef KERBEROS5 457 kerror = krb5_init_context(&kcontext); 458 if (kerror) { 459 syslog(LOG_NOTICE, "%s when initializing Kerberos context", 460 error_message(kerror)); 461 exit(0); 462 } 463 #endif /* KERBEROS5 */ 464 465 init_curclass(); 466 curclass.timeout = 300; /* 5 minutes, as per login(1) */ 467 curclass.type = CLASS_REAL; 468 469 /* If logins are disabled, print out the message. */ 470 if (format_file(_PATH_NOLOGIN, 530)) { 471 reply(530, "System not available."); 472 exit(0); 473 } 474 (void)format_file(conffilename(_PATH_FTPWELCOME), 220); 475 /* reply(220,) must follow */ 476 reply(220, "%s FTP server (%s) ready.", hostname, version); 477 478 (void) setjmp(errcatch); 479 for (;;) 480 (void) yyparse(); 481 /* NOTREACHED */ 482 } 483 484 static void 485 lostconn(signo) 486 int signo; 487 { 488 489 if (debug) 490 syslog(LOG_DEBUG, "lost connection"); 491 dologout(1); 492 } 493 494 /* 495 * Save the result of a getpwnam. Used for USER command, since 496 * the data returned must not be clobbered by any other command 497 * (e.g., globbing). 498 */ 499 static struct passwd * 500 sgetpwnam(name) 501 const char *name; 502 { 503 static struct passwd save; 504 struct passwd *p; 505 506 if ((p = getpwnam(name)) == NULL) 507 return (p); 508 if (save.pw_name) { 509 free((char *)save.pw_name); 510 memset(save.pw_passwd, 0, strlen(save.pw_passwd)); 511 free((char *)save.pw_passwd); 512 free((char *)save.pw_gecos); 513 free((char *)save.pw_dir); 514 free((char *)save.pw_shell); 515 } 516 save = *p; 517 save.pw_name = xstrdup(p->pw_name); 518 save.pw_passwd = xstrdup(p->pw_passwd); 519 save.pw_gecos = xstrdup(p->pw_gecos); 520 save.pw_dir = xstrdup(p->pw_dir); 521 save.pw_shell = xstrdup(p->pw_shell); 522 return (&save); 523 } 524 525 static int login_attempts; /* number of failed login attempts */ 526 static int askpasswd; /* had user command, ask for passwd */ 527 static char curname[10]; /* current USER name */ 528 529 /* 530 * USER command. 531 * Sets global passwd pointer pw if named account exists and is acceptable; 532 * sets askpasswd if a PASS command is expected. If logged in previously, 533 * need to reset state. If name is "ftp" or "anonymous", the name is not in 534 * _PATH_FTPUSERS, and ftp account exists, set guest and pw, then just return. 535 * If account doesn't exist, ask for passwd anyway. Otherwise, check user 536 * requesting login privileges. Disallow anyone who does not have a standard 537 * shell as returned by getusershell(). Disallow anyone mentioned in the file 538 * _PATH_FTPUSERS to allow people such as root and uucp to be avoided. 539 */ 540 void 541 user(name) 542 const char *name; 543 { 544 if (logged_in) { 545 switch (curclass.type) { 546 case CLASS_GUEST: 547 reply(530, "Can't change user from guest login."); 548 return; 549 case CLASS_CHROOT: 550 reply(530, "Can't change user from chroot user."); 551 return; 552 case CLASS_REAL: 553 end_login(); 554 break; 555 default: 556 abort(); 557 } 558 } 559 560 #if defined(KERBEROS) || defined(KERBEROS5) 561 kdestroy(); 562 #endif 563 564 curclass.type = CLASS_REAL; 565 if (strcmp(name, "ftp") == 0 || strcmp(name, "anonymous") == 0) { 566 /* need `pw' setup for checkaccess() and checkuser () */ 567 if ((pw = sgetpwnam("ftp")) == NULL) 568 reply(530, "User %s unknown.", name); 569 else if (! checkaccess("ftp") || ! checkaccess("anonymous")) 570 reply(530, "User %s access denied.", name); 571 else { 572 curclass.type = CLASS_GUEST; 573 askpasswd = 1; 574 reply(331, 575 "Guest login ok, type your name as password."); 576 } 577 if (!askpasswd && logging) 578 syslog(LOG_NOTICE, 579 "ANONYMOUS FTP LOGIN REFUSED FROM %s", remotehost); 580 return; 581 } 582 583 pw = sgetpwnam(name); 584 if (logging) 585 strlcpy(curname, name, sizeof(curname)); 586 587 #ifdef SKEY 588 if (skey_haskey(name) == 0) { 589 char *myskey; 590 591 myskey = skey_keyinfo(name); 592 reply(331, "Password [%s] required for %s.", 593 myskey ? myskey : "error getting challenge", name); 594 } else 595 #endif 596 reply(331, "Password required for %s.", name); 597 598 askpasswd = 1; 599 /* 600 * Delay before reading passwd after first failed 601 * attempt to slow down passwd-guessing programs. 602 */ 603 if (login_attempts) 604 sleep((unsigned) login_attempts); 605 } 606 607 /* 608 * Determine whether something is to happen (allow access, chroot) 609 * for a user. Each line is a shell-style glob followed by 610 * `yes' or `no'. 611 * 612 * For backward compatability, `allow' and `deny' are synonymns 613 * for `yes' and `no', respectively. 614 * 615 * Each glob is matched against the username in turn, and the first 616 * match found is used. If no match is found, the result is the 617 * argument `def'. If a match is found but without and explicit 618 * `yes'/`no', the result is the opposite of def. 619 * 620 * If the file doesn't exist at all, the result is the argument 621 * `nofile' 622 * 623 * Any line starting with `#' is considered a comment and ignored. 624 * 625 * Returns 0 if the user is denied, or 1 if they are allowed. 626 * 627 * NOTE: needs struct passwd *pw setup before use. 628 */ 629 int 630 checkuser(fname, name, def, nofile, retclass) 631 const char *fname, *name; 632 int def, nofile; 633 char **retclass; 634 { 635 FILE *fd; 636 int retval; 637 char *glob, *perm, *class, *buf, *p; 638 size_t len, line; 639 640 retval = def; 641 if (retclass != NULL) 642 *retclass = NULL; 643 if ((fd = fopen(conffilename(fname), "r")) == NULL) 644 return nofile; 645 646 line = 0; 647 for (; 648 (buf = fparseln(fd, &len, &line, NULL, FPARSELN_UNESCCOMM | 649 FPARSELN_UNESCCONT | FPARSELN_UNESCESC)) != NULL; 650 free(buf), buf = NULL) { 651 glob = perm = class = NULL; 652 p = buf; 653 if (len < 1) 654 continue; 655 if (p[len - 1] == '\n') 656 p[--len] = '\0'; 657 if (EMPTYSTR(p)) 658 continue; 659 660 NEXTWORD(p, glob); 661 NEXTWORD(p, perm); 662 NEXTWORD(p, class); 663 if (EMPTYSTR(glob)) 664 continue; 665 if (!EMPTYSTR(class)) { 666 if (strcasecmp(class, "all") == 0 || 667 strcasecmp(class, "none") == 0) { 668 syslog(LOG_WARNING, 669 "%s line %d: illegal user-defined class `%s' - skipping entry", 670 fname, (int)line, class); 671 continue; 672 } 673 } 674 675 /* have a host specifier */ 676 if ((p = strchr(glob, '@')) != NULL) { 677 u_int32_t net, mask, addr; 678 int bits; 679 680 *p++ = '\0'; 681 /* check against network or CIDR */ 682 if (isdigit(*p) && 683 (bits = inet_net_pton(AF_INET, p, 684 &net, sizeof(net))) != -1) { 685 net = ntohl(net); 686 mask = 0xffffffffU << (32 - bits); 687 addr = ntohl(his_addr.su_sin.sin_addr.s_addr); 688 if ((addr & mask) != net) 689 continue; 690 691 /* check against hostname glob */ 692 } else if (fnmatch(p, remotehost, 0) != 0) 693 continue; 694 } 695 696 /* have a group specifier */ 697 if ((p = strchr(glob, ':')) != NULL) { 698 gid_t *groups, *ng; 699 int gsize, i, found; 700 701 *p++ = '\0'; 702 groups = NULL; 703 gsize = 16; 704 do { 705 ng = realloc(groups, gsize * sizeof(gid_t)); 706 if (ng == NULL) 707 fatal( 708 "Local resource failure: realloc"); 709 groups = ng; 710 } while (getgrouplist(pw->pw_name, pw->pw_gid, 711 groups, &gsize) == -1); 712 found = 0; 713 for (i = 0; i < gsize; i++) { 714 struct group *g; 715 716 if ((g = getgrgid(groups[i])) == NULL) 717 continue; 718 if (fnmatch(p, g->gr_name, 0) == 0) { 719 found = 1; 720 break; 721 } 722 } 723 free(groups); 724 if (!found) 725 continue; 726 } 727 728 /* check against username glob */ 729 if (fnmatch(glob, name, 0) != 0) 730 continue; 731 732 if (perm != NULL && 733 ((strcasecmp(perm, "allow") == 0) || 734 (strcasecmp(perm, "yes") == 0))) 735 retval = 1; 736 else if (perm != NULL && 737 ((strcasecmp(perm, "deny") == 0) || 738 (strcasecmp(perm, "no") == 0))) 739 retval = 0; 740 else 741 retval = !def; 742 if (!EMPTYSTR(class) && retclass != NULL) 743 *retclass = xstrdup(class); 744 free(buf); 745 break; 746 } 747 (void) fclose(fd); 748 return (retval); 749 } 750 751 /* 752 * Check if user is allowed by /etc/ftpusers 753 * returns 1 for yes, 0 for no 754 * 755 * NOTE: needs struct passwd *pw setup (for checkuser()) 756 */ 757 int 758 checkaccess(name) 759 const char *name; 760 { 761 762 return (checkuser(_PATH_FTPUSERS, name, 1, 0, NULL)); 763 } 764 765 /* 766 * Terminate login as previous user, if any, resetting state; 767 * used when USER command is given or login fails. 768 */ 769 static void 770 end_login() 771 { 772 773 (void) seteuid((uid_t)0); 774 if (logged_in) { 775 logwtmp(ttyline, "", ""); 776 if (doutmp) 777 logout(utmp.ut_line); 778 } 779 pw = NULL; 780 logged_in = 0; 781 quietmessages = 0; 782 curclass.type = CLASS_REAL; 783 } 784 785 void 786 pass(passwd) 787 const char *passwd; 788 { 789 int rval; 790 const char *cp, *shell, *home; 791 char *class; 792 793 class = NULL; 794 if (logged_in || askpasswd == 0) { 795 reply(503, "Login with USER first."); 796 return; 797 } 798 askpasswd = 0; 799 if (curclass.type != CLASS_GUEST) { 800 /* "ftp" is only account allowed no password */ 801 if (pw == NULL) { 802 rval = 1; /* failure below */ 803 goto skip; 804 } 805 #if defined(KERBEROS) || defined(KERBEROS5) 806 if (klogin(pw, "", hostname, (char *)passwd) == 0) { 807 rval = 0; 808 goto skip; 809 } 810 #endif 811 #ifdef SKEY 812 if (skey_haskey(pw->pw_name) == 0) { 813 char *p; 814 int r; 815 816 p = xstrdup(passwd); 817 r = skey_passcheck(pw->pw_name, p); 818 free(p); 819 if (r != -1) { 820 rval = 0; 821 goto skip; 822 } 823 } 824 #endif 825 if (!sflag && *pw->pw_passwd != '\0' && 826 !strcmp(crypt(passwd, pw->pw_passwd), pw->pw_passwd)) { 827 rval = 0; 828 goto skip; 829 } 830 rval = 1; 831 832 skip: 833 if (pw != NULL && pw->pw_expire && time(NULL) >= pw->pw_expire) 834 rval = 2; 835 /* 836 * If rval > 0, the user failed the authentication check 837 * above. If rval == 0, either Kerberos or local authentication 838 * succeeded. 839 */ 840 if (rval) { 841 reply(530, rval == 2 ? "Password expired." : 842 "Login incorrect."); 843 if (logging) { 844 syslog(LOG_NOTICE, 845 "FTP LOGIN FAILED FROM %s", remotehost); 846 syslog(LOG_AUTHPRIV | LOG_NOTICE, 847 "FTP LOGIN FAILED FROM %s, %s", 848 remotehost, curname); 849 } 850 pw = NULL; 851 if (login_attempts++ >= 5) { 852 syslog(LOG_NOTICE, 853 "repeated login failures from %s", 854 remotehost); 855 exit(0); 856 } 857 return; 858 } 859 } 860 861 /* password was ok; see if anything else prevents login */ 862 if (! checkuser(_PATH_FTPUSERS, pw->pw_name, 1, 0, &class)) { 863 reply(530, "User %s may not use FTP.", pw->pw_name); 864 if (logging) 865 syslog(LOG_NOTICE, "FTP LOGIN REFUSED FROM %s, %s", 866 remotehost, pw->pw_name); 867 goto bad; 868 } 869 /* check for valid shell, if not guest user */ 870 if ((shell = pw->pw_shell) == NULL || *shell == 0) 871 shell = _PATH_BSHELL; 872 while ((cp = getusershell()) != NULL) 873 if (strcmp(cp, shell) == 0) 874 break; 875 endusershell(); 876 if (cp == NULL && curclass.type != CLASS_GUEST) { 877 reply(530, "User %s may not use FTP.", pw->pw_name); 878 if (logging) 879 syslog(LOG_NOTICE, "FTP LOGIN REFUSED FROM %s, %s", 880 remotehost, pw->pw_name); 881 goto bad; 882 } 883 884 login_attempts = 0; /* this time successful */ 885 if (setegid((gid_t)pw->pw_gid) < 0) { 886 reply(550, "Can't set gid."); 887 goto bad; 888 } 889 (void) initgroups(pw->pw_name, pw->pw_gid); 890 891 /* open wtmp before chroot */ 892 logwtmp(ttyline, pw->pw_name, remotehost); 893 894 /* open utmp before chroot */ 895 if (doutmp) { 896 memset((void *)&utmp, 0, sizeof(utmp)); 897 (void)time(&utmp.ut_time); 898 (void)strncpy(utmp.ut_name, pw->pw_name, sizeof(utmp.ut_name)); 899 (void)strncpy(utmp.ut_host, remotehost, sizeof(utmp.ut_host)); 900 (void)strncpy(utmp.ut_line, ttyline, sizeof(utmp.ut_line)); 901 login(&utmp); 902 } 903 904 logged_in = 1; 905 906 /* check user in /etc/ftpchroot */ 907 if (checkuser(_PATH_FTPCHROOT, pw->pw_name, 0, 0, NULL)) { 908 if (curclass.type == CLASS_GUEST) { 909 syslog(LOG_NOTICE, 910 "Can't change guest user to chroot class; remove entry in %s", 911 _PATH_FTPCHROOT); 912 exit(1); 913 } 914 curclass.type = CLASS_CHROOT; 915 } 916 if (class == NULL) { 917 switch (curclass.type) { 918 case CLASS_GUEST: 919 class = xstrdup("guest"); 920 break; 921 case CLASS_CHROOT: 922 class = xstrdup("chroot"); 923 break; 924 case CLASS_REAL: 925 class = xstrdup("real"); 926 break; 927 default: 928 abort(); 929 } 930 } 931 932 /* parse ftpd.conf, setting up various parameters */ 933 parse_conf(class); 934 count_users(); 935 if (curclass.limit != -1 && connections > curclass.limit) { 936 if (! EMPTYSTR(curclass.limitfile)) 937 (void)format_file(conffilename(curclass.limitfile),530); 938 reply(530, 939 "User %s access denied, connection limit of %d reached.", 940 pw->pw_name, curclass.limit); 941 syslog(LOG_NOTICE, 942 "Maximum connection limit of %d for class %s reached, login refused", 943 curclass.limit, curclass.classname); 944 goto bad; 945 } 946 947 home = "/"; 948 switch (curclass.type) { 949 case CLASS_GUEST: 950 /* 951 * We MUST do a chdir() after the chroot. Otherwise 952 * the old current directory will be accessible as "." 953 * outside the new root! 954 */ 955 if (chroot(anondir ? anondir : pw->pw_dir) < 0 || 956 chdir("/") < 0) { 957 reply(550, "Can't set guest privileges."); 958 goto bad; 959 } 960 break; 961 case CLASS_CHROOT: 962 if (chroot(pw->pw_dir) < 0 || chdir("/") < 0) { 963 reply(550, "Can't change root."); 964 goto bad; 965 } 966 break; 967 case CLASS_REAL: 968 if (chdir(pw->pw_dir) < 0) { 969 if (chdir("/") < 0) { 970 reply(530, 971 "User %s: can't change directory to %s.", 972 pw->pw_name, pw->pw_dir); 973 goto bad; 974 } else 975 lreply(230, 976 "No directory! Logging in with home=/"); 977 } else 978 home = pw->pw_dir; 979 break; 980 } 981 if (seteuid((uid_t)pw->pw_uid) < 0) { 982 reply(550, "Can't set uid."); 983 goto bad; 984 } 985 setenv("HOME", home, 1); 986 987 if (curclass.type == CLASS_GUEST && passwd[0] == '-') 988 quietmessages = 1; 989 990 /* 991 * Display a login message, if it exists. 992 * N.B. reply(230,) must follow the message. 993 */ 994 (void)format_file(conffilename(curclass.motd), 230); 995 show_chdir_messages(230); 996 if (curclass.type == CLASS_GUEST) { 997 reply(230, "Guest login ok, access restrictions apply."); 998 #ifdef HASSETPROCTITLE 999 snprintf(proctitle, sizeof(proctitle), 1000 "%s: anonymous/%.*s", remotehost, 1001 (int) (sizeof(proctitle) - sizeof(remotehost) - 1002 sizeof(": anonymous/")), passwd); 1003 setproctitle(proctitle); 1004 #endif /* HASSETPROCTITLE */ 1005 if (logging) 1006 syslog(LOG_INFO, 1007 "ANONYMOUS FTP LOGIN FROM %s, %s (class: %s, type: %s)", 1008 remotehost, passwd, 1009 curclass.classname, CURCLASSTYPE); 1010 } else { 1011 reply(230, "User %s logged in.", pw->pw_name); 1012 #ifdef HASSETPROCTITLE 1013 snprintf(proctitle, sizeof(proctitle), 1014 "%s: %s", remotehost, pw->pw_name); 1015 setproctitle(proctitle); 1016 #endif /* HASSETPROCTITLE */ 1017 if (logging) 1018 syslog(LOG_INFO, 1019 "FTP LOGIN FROM %s as %s (class: %s, type: %s)", 1020 remotehost, pw->pw_name, 1021 curclass.classname, CURCLASSTYPE); 1022 } 1023 (void) umask(curclass.umask); 1024 goto cleanuppass; 1025 bad: 1026 /* Forget all about it... */ 1027 end_login(); 1028 cleanuppass: 1029 if (class) 1030 free(class); 1031 } 1032 1033 void 1034 retrieve(argv, name) 1035 char *argv[]; 1036 const char *name; 1037 { 1038 FILE *fin = NULL, *dout; 1039 struct stat st; 1040 int (*closefunc) __P((FILE *)) = NULL; 1041 int log, sendrv, closerv, stderrfd, isconversion, isdata, isls; 1042 struct timeval start, finish, td, *tdp; 1043 const char *dispname; 1044 1045 sendrv = closerv = stderrfd = -1; 1046 isconversion = isdata = isls = log = 0; 1047 tdp = NULL; 1048 dispname = name; 1049 if (argv == NULL) { 1050 log = 1; 1051 isdata = 1; 1052 fin = fopen(name, "r"); 1053 closefunc = fclose; 1054 if (fin == NULL) 1055 argv = do_conversion(name); 1056 if (argv != NULL) { 1057 isconversion++; 1058 syslog(LOG_INFO, "get command: '%s' on '%s'", 1059 argv[0], name); 1060 } 1061 } 1062 if (argv != NULL) { 1063 char temp[MAXPATHLEN]; 1064 1065 if (strcmp(argv[0], INTERNAL_LS) == 0) { 1066 isls = 1; 1067 stderrfd = -1; 1068 } else { 1069 (void)snprintf(temp, sizeof(temp), "%s", TMPFILE); 1070 stderrfd = mkstemp(temp); 1071 if (stderrfd != -1) 1072 (void)unlink(temp); 1073 } 1074 dispname = argv[0]; 1075 fin = ftpd_popen(argv, "r", stderrfd); 1076 closefunc = ftpd_pclose; 1077 st.st_size = -1; 1078 st.st_blksize = BUFSIZ; 1079 } 1080 if (fin == NULL) { 1081 if (errno != 0) { 1082 perror_reply(550, dispname); 1083 if (log) 1084 logcmd("get", -1, name, NULL, NULL, 1085 strerror(errno)); 1086 } 1087 goto cleanupretrieve; 1088 } 1089 byte_count = -1; 1090 if (argv == NULL 1091 && (fstat(fileno(fin), &st) < 0 || !S_ISREG(st.st_mode))) { 1092 reply(550, "%s: not a plain file.", dispname); 1093 goto done; 1094 } 1095 if (restart_point) { 1096 if (type == TYPE_A) { 1097 off_t i; 1098 int c; 1099 1100 for (i = 0; i < restart_point; i++) { 1101 if ((c=getc(fin)) == EOF) { 1102 perror_reply(550, dispname); 1103 goto done; 1104 } 1105 if (c == '\n') 1106 i++; 1107 } 1108 } else if (lseek(fileno(fin), restart_point, SEEK_SET) < 0) { 1109 perror_reply(550, dispname); 1110 goto done; 1111 } 1112 } 1113 dout = dataconn(dispname, st.st_size, "w"); 1114 if (dout == NULL) 1115 goto done; 1116 1117 (void)gettimeofday(&start, NULL); 1118 sendrv = send_data(fin, dout, st.st_blksize, isdata); 1119 (void)gettimeofday(&finish, NULL); 1120 (void) fclose(dout); 1121 timersub(&finish, &start, &td); 1122 tdp = &td; 1123 data = -1; 1124 pdata = -1; 1125 done: 1126 if (log) 1127 logcmd("get", byte_count, name, NULL, tdp, NULL); 1128 closerv = (*closefunc)(fin); 1129 if (sendrv == 0) { 1130 FILE *err; 1131 struct stat sb; 1132 1133 if (!isls && argv != NULL && closerv != 0) { 1134 lreply(226, 1135 "Command returned an exit status of %d", 1136 closerv); 1137 if (isconversion) 1138 syslog(LOG_INFO, 1139 "retrieve command: '%s' returned %d", 1140 argv[0], closerv); 1141 } 1142 if (!isls && argv != NULL && stderrfd != -1 && 1143 (fstat(stderrfd, &sb) == 0) && sb.st_size > 0 && 1144 ((err = fdopen(stderrfd, "r")) != NULL)) { 1145 char *cp, line[LINE_MAX]; 1146 1147 lreply(226, "Command error messages:"); 1148 rewind(err); 1149 while (fgets(line, sizeof(line), err) != NULL) { 1150 if ((cp = strchr(line, '\n')) != NULL) 1151 *cp = '\0'; 1152 lreply(0, " %s", line); 1153 } 1154 (void) fflush(stdout); 1155 (void) fclose(err); 1156 /* a reply(226,) must follow */ 1157 } 1158 reply(226, "Transfer complete."); 1159 } 1160 cleanupretrieve: 1161 if (stderrfd != -1) 1162 (void)close(stderrfd); 1163 if (isconversion) 1164 free(argv); 1165 } 1166 1167 void 1168 store(name, mode, unique) 1169 const char *name, *mode; 1170 int unique; 1171 { 1172 FILE *fout, *din; 1173 struct stat st; 1174 int (*closefunc) __P((FILE *)); 1175 struct timeval start, finish, td, *tdp; 1176 char *desc; 1177 1178 desc = (*mode == 'w') ? "put" : "append"; 1179 if (unique && stat(name, &st) == 0 && 1180 (name = gunique(name)) == NULL) { 1181 logcmd(desc, -1, name, NULL, NULL, "cannot create unique file"); 1182 return; 1183 } 1184 1185 if (restart_point) 1186 mode = "r+"; 1187 fout = fopen(name, mode); 1188 closefunc = fclose; 1189 tdp = NULL; 1190 if (fout == NULL) { 1191 perror_reply(553, name); 1192 logcmd(desc, -1, name, NULL, NULL, strerror(errno)); 1193 return; 1194 } 1195 byte_count = -1; 1196 if (restart_point) { 1197 if (type == TYPE_A) { 1198 off_t i; 1199 int c; 1200 1201 for (i = 0; i < restart_point; i++) { 1202 if ((c=getc(fout)) == EOF) { 1203 perror_reply(550, name); 1204 goto done; 1205 } 1206 if (c == '\n') 1207 i++; 1208 } 1209 /* 1210 * We must do this seek to "current" position 1211 * because we are changing from reading to 1212 * writing. 1213 */ 1214 if (fseek(fout, 0L, SEEK_CUR) < 0) { 1215 perror_reply(550, name); 1216 goto done; 1217 } 1218 } else if (lseek(fileno(fout), restart_point, SEEK_SET) < 0) { 1219 perror_reply(550, name); 1220 goto done; 1221 } 1222 } 1223 din = dataconn(name, (off_t)-1, "r"); 1224 if (din == NULL) 1225 goto done; 1226 (void)gettimeofday(&start, NULL); 1227 if (receive_data(din, fout) == 0) { 1228 if (unique) 1229 reply(226, "Transfer complete (unique file name:%s).", 1230 name); 1231 else 1232 reply(226, "Transfer complete."); 1233 } 1234 (void)gettimeofday(&finish, NULL); 1235 (void) fclose(din); 1236 timersub(&finish, &start, &td); 1237 tdp = &td; 1238 data = -1; 1239 pdata = -1; 1240 done: 1241 logcmd(desc, byte_count, name, NULL, tdp, NULL); 1242 (*closefunc)(fout); 1243 } 1244 1245 static FILE * 1246 getdatasock(mode) 1247 const char *mode; 1248 { 1249 int on = 1, s, t, tries; 1250 1251 if (data >= 0) 1252 return (fdopen(data, mode)); 1253 (void) seteuid((uid_t)0); 1254 s = socket(ctrl_addr.su_family, SOCK_STREAM, 0); 1255 if (s < 0) 1256 goto bad; 1257 if (setsockopt(s, SOL_SOCKET, SO_REUSEADDR, 1258 (char *) &on, sizeof(on)) < 0) 1259 goto bad; 1260 if (setsockopt(s, SOL_SOCKET, SO_KEEPALIVE, 1261 (char *) &on, sizeof(on)) < 0) 1262 goto bad; 1263 /* anchor socket to avoid multi-homing problems */ 1264 data_source = ctrl_addr; 1265 data_source.su_port = htons(20); /* ftp-data port */ 1266 for (tries = 1; ; tries++) { 1267 if (bind(s, (struct sockaddr *)&data_source, 1268 data_source.su_len) >= 0) 1269 break; 1270 if (errno != EADDRINUSE || tries > 10) 1271 goto bad; 1272 sleep(tries); 1273 } 1274 (void) seteuid((uid_t)pw->pw_uid); 1275 #ifdef IP_TOS 1276 if (!mapped && ctrl_addr.su_family == AF_INET) { 1277 on = IPTOS_THROUGHPUT; 1278 if (setsockopt(s, IPPROTO_IP, IP_TOS, (char *)&on, 1279 sizeof(int)) < 0) 1280 syslog(LOG_WARNING, "setsockopt (IP_TOS): %m"); 1281 } 1282 #endif 1283 return (fdopen(s, mode)); 1284 bad: 1285 /* Return the real value of errno (close may change it) */ 1286 t = errno; 1287 (void) seteuid((uid_t)pw->pw_uid); 1288 (void) close(s); 1289 errno = t; 1290 return (NULL); 1291 } 1292 1293 static FILE * 1294 dataconn(name, size, mode) 1295 const char *name; 1296 off_t size; 1297 const char *mode; 1298 { 1299 char sizebuf[32]; 1300 FILE *file; 1301 int retry = 0, tos, keepalive; 1302 1303 file_size = size; 1304 byte_count = 0; 1305 if (size != (off_t) -1) 1306 (void)snprintf(sizebuf, sizeof(sizebuf), " (%qd byte%s)", 1307 (qdfmt_t)size, PLURAL(size)); 1308 else 1309 sizebuf[0] = '\0'; 1310 if (pdata >= 0) { 1311 union sockunion from; 1312 int s, fromlen = sizeof(from); 1313 1314 (void) alarm(curclass.timeout); 1315 s = accept(pdata, (struct sockaddr *)&from, &fromlen); 1316 (void) alarm(0); 1317 if (s < 0) { 1318 reply(425, "Can't open data connection."); 1319 (void) close(pdata); 1320 pdata = -1; 1321 return (NULL); 1322 } 1323 (void) close(pdata); 1324 pdata = s; 1325 switch (from.su_family) { 1326 case AF_INET: 1327 #ifdef IP_TOS 1328 if (!mapped) { 1329 tos = IPTOS_THROUGHPUT; 1330 (void) setsockopt(s, IPPROTO_IP, IP_TOS, 1331 (char *)&tos, sizeof(int)); 1332 } 1333 break; 1334 #endif 1335 } 1336 /* Set keepalives on the socket to detect dropped conns. */ 1337 #ifdef SO_KEEPALIVE 1338 keepalive = 1; 1339 (void) setsockopt(s, SOL_SOCKET, SO_KEEPALIVE, 1340 (char *)&keepalive, sizeof(int)); 1341 #endif 1342 reply(150, "Opening %s mode data connection for '%s'%s.", 1343 type == TYPE_A ? "ASCII" : "BINARY", name, sizebuf); 1344 return (fdopen(pdata, mode)); 1345 } 1346 if (data >= 0) { 1347 reply(125, "Using existing data connection for '%s'%s.", 1348 name, sizebuf); 1349 usedefault = 1; 1350 return (fdopen(data, mode)); 1351 } 1352 if (usedefault) 1353 data_dest = his_addr; 1354 usedefault = 1; 1355 file = getdatasock(mode); 1356 if (file == NULL) { 1357 char hbuf[INET6_ADDRSTRLEN]; 1358 char pbuf[10]; 1359 getnameinfo((struct sockaddr *)&data_source, data_source.su_len, 1360 hbuf, sizeof(hbuf), pbuf, sizeof(pbuf), 1361 NI_NUMERICHOST | NI_NUMERICSERV); 1362 reply(425, "Can't create data socket (%s,%s): %s.", 1363 hbuf, pbuf, strerror(errno)); 1364 return (NULL); 1365 } 1366 data = fileno(file); 1367 while (connect(data, (struct sockaddr *)&data_dest, 1368 data_dest.su_len) < 0) { 1369 if (errno == EADDRINUSE && retry < swaitmax) { 1370 sleep((unsigned) swaitint); 1371 retry += swaitint; 1372 continue; 1373 } 1374 perror_reply(425, "Can't build data connection"); 1375 (void) fclose(file); 1376 data = -1; 1377 return (NULL); 1378 } 1379 reply(150, "Opening %s mode data connection for '%s'%s.", 1380 type == TYPE_A ? "ASCII" : "BINARY", name, sizebuf); 1381 return (file); 1382 } 1383 1384 /* 1385 * Tranfer the contents of "instr" to "outstr" peer using the appropriate 1386 * encapsulation of the data subject * to Mode, Structure, and Type. 1387 * 1388 * NB: Form isn't handled. 1389 */ 1390 static int 1391 send_data(instr, outstr, blksize, isdata) 1392 FILE *instr, *outstr; 1393 off_t blksize; 1394 int isdata; 1395 { 1396 int c, filefd, netfd, rval; 1397 char *buf; 1398 1399 transflag = 1; 1400 rval = -1; 1401 buf = NULL; 1402 if (setjmp(urgcatch)) 1403 goto cleanup_send_data; 1404 1405 switch (type) { 1406 1407 case TYPE_A: 1408 /* XXXX: rate limit ascii send (get) */ 1409 (void) alarm(curclass.timeout); 1410 while ((c = getc(instr)) != EOF) { 1411 byte_count++; 1412 if (c == '\n') { 1413 if (ferror(outstr)) 1414 goto data_err; 1415 (void) putc('\r', outstr); 1416 if (isdata) { 1417 total_data_out++; 1418 total_data++; 1419 } 1420 total_bytes_out++; 1421 total_bytes++; 1422 } 1423 (void) putc(c, outstr); 1424 if (isdata) { 1425 total_data_out++; 1426 total_data++; 1427 } 1428 total_bytes_out++; 1429 total_bytes++; 1430 if ((byte_count % 4096) == 0) 1431 (void) alarm(curclass.timeout); 1432 } 1433 (void) alarm(0); 1434 fflush(outstr); 1435 if (ferror(instr)) 1436 goto file_err; 1437 if (ferror(outstr)) 1438 goto data_err; 1439 rval = 0; 1440 goto cleanup_send_data; 1441 1442 case TYPE_I: 1443 case TYPE_L: 1444 if ((buf = malloc((size_t)blksize)) == NULL) { 1445 perror_reply(451, "Local resource failure: malloc"); 1446 goto cleanup_send_data; 1447 } 1448 filefd = fileno(instr); 1449 netfd = fileno(outstr); 1450 (void) alarm(curclass.timeout); 1451 if (curclass.rateget) { 1452 while (1) { 1453 int d; 1454 struct timeval then, now, td; 1455 off_t bufrem; 1456 char *bufp; 1457 1458 (void)gettimeofday(&then, NULL); 1459 errno = c = d = 0; 1460 bufrem = curclass.rateget; 1461 while (bufrem > 0) { 1462 if ((c = read(filefd, buf, 1463 MIN(blksize, bufrem))) <= 0) 1464 goto senddone; 1465 (void) alarm(curclass.timeout); 1466 bufrem -= c; 1467 byte_count += c; 1468 if (isdata) { 1469 total_data_out += c; 1470 total_data += c; 1471 } 1472 total_bytes_out += c; 1473 total_bytes += c; 1474 for (bufp = buf; c > 0; 1475 c -= d, bufp += d) 1476 if ((d = 1477 write(netfd, bufp, c)) <= 0) 1478 break; 1479 if (d < 0) 1480 goto data_err; 1481 } 1482 (void)gettimeofday(&now, NULL); 1483 timersub(&now, &then, &td); 1484 if (td.tv_sec > 0) 1485 break; 1486 usleep(1000000 - td.tv_usec); 1487 } 1488 } else { 1489 while ((c = read(filefd, buf, (size_t)blksize)) > 0) { 1490 if (write(netfd, buf, c) != c) 1491 goto data_err; 1492 (void) alarm(curclass.timeout); 1493 byte_count += c; 1494 if (isdata) { 1495 total_data_out += c; 1496 total_data += c; 1497 } 1498 total_bytes_out += c; 1499 total_bytes += c; 1500 } 1501 } 1502 senddone: 1503 if (c < 0) 1504 goto file_err; 1505 rval = 0; 1506 goto cleanup_send_data; 1507 1508 default: 1509 reply(550, "Unimplemented TYPE %d in send_data", type); 1510 goto cleanup_send_data; 1511 } 1512 1513 data_err: 1514 (void) alarm(0); 1515 perror_reply(426, "Data connection"); 1516 goto cleanup_send_data; 1517 1518 file_err: 1519 (void) alarm(0); 1520 perror_reply(551, "Error on input file"); 1521 /* FALLTHROUGH */ 1522 1523 cleanup_send_data: 1524 (void) alarm(0); 1525 transflag = 0; 1526 if (buf) 1527 free(buf); 1528 if (isdata) { 1529 total_files_out++; 1530 total_files++; 1531 } 1532 total_xfers_out++; 1533 total_xfers++; 1534 return (rval); 1535 } 1536 1537 /* 1538 * Transfer data from peer to "outstr" using the appropriate encapulation of 1539 * the data subject to Mode, Structure, and Type. 1540 * 1541 * N.B.: Form isn't handled. 1542 */ 1543 static int 1544 receive_data(instr, outstr) 1545 FILE *instr, *outstr; 1546 { 1547 int c, bare_lfs, netfd, filefd, rval; 1548 char buf[BUFSIZ]; 1549 #ifdef __GNUC__ 1550 (void) &bare_lfs; 1551 #endif 1552 1553 bare_lfs = 0; 1554 transflag = 1; 1555 rval = -1; 1556 if (setjmp(urgcatch)) 1557 goto cleanup_recv_data; 1558 1559 switch (type) { 1560 1561 case TYPE_I: 1562 case TYPE_L: 1563 netfd = fileno(instr); 1564 filefd = fileno(outstr); 1565 (void) alarm(curclass.timeout); 1566 if (curclass.rateput) { 1567 while (1) { 1568 int d; 1569 struct timeval then, now, td; 1570 off_t bufrem; 1571 1572 (void)gettimeofday(&then, NULL); 1573 errno = c = d = 0; 1574 for (bufrem = curclass.rateput; bufrem > 0; ) { 1575 if ((c = read(netfd, buf, 1576 MIN(sizeof(buf), bufrem))) <= 0) 1577 goto recvdone; 1578 if ((d = write(filefd, buf, c)) != c) 1579 goto recvdone; 1580 (void) alarm(curclass.timeout); 1581 bufrem -= c; 1582 byte_count += c; 1583 total_data_in += c; 1584 total_data += c; 1585 total_bytes_in += c; 1586 total_bytes += c; 1587 } 1588 (void)gettimeofday(&now, NULL); 1589 timersub(&now, &then, &td); 1590 if (td.tv_sec > 0) 1591 break; 1592 usleep(1000000 - td.tv_usec); 1593 } 1594 } else { 1595 while ((c = read(netfd, buf, sizeof(buf))) > 0) { 1596 if (write(filefd, buf, c) != c) 1597 goto file_err; 1598 (void) alarm(curclass.timeout); 1599 byte_count += c; 1600 total_data_in += c; 1601 total_data += c; 1602 total_bytes_in += c; 1603 total_bytes += c; 1604 } 1605 } 1606 recvdone: 1607 if (c < 0) 1608 goto data_err; 1609 rval = 0; 1610 goto cleanup_recv_data; 1611 1612 case TYPE_E: 1613 reply(553, "TYPE E not implemented."); 1614 goto cleanup_recv_data; 1615 1616 case TYPE_A: 1617 (void) alarm(curclass.timeout); 1618 /* XXXX: rate limit ascii receive (put) */ 1619 while ((c = getc(instr)) != EOF) { 1620 byte_count++; 1621 total_data_in++; 1622 total_data++; 1623 total_bytes_in++; 1624 total_bytes++; 1625 if ((byte_count % 4096) == 0) 1626 (void) alarm(curclass.timeout); 1627 if (c == '\n') 1628 bare_lfs++; 1629 while (c == '\r') { 1630 if (ferror(outstr)) 1631 goto data_err; 1632 if ((c = getc(instr)) != '\n') { 1633 byte_count++; 1634 total_data_in++; 1635 total_data++; 1636 total_bytes_in++; 1637 total_bytes++; 1638 if ((byte_count % 4096) == 0) 1639 (void) alarm(curclass.timeout); 1640 (void) putc ('\r', outstr); 1641 if (c == '\0' || c == EOF) 1642 goto contin2; 1643 } 1644 } 1645 (void) putc(c, outstr); 1646 contin2: ; 1647 } 1648 (void) alarm(0); 1649 fflush(outstr); 1650 if (ferror(instr)) 1651 goto data_err; 1652 if (ferror(outstr)) 1653 goto file_err; 1654 if (bare_lfs) { 1655 lreply(226, 1656 "WARNING! %d bare linefeeds received in ASCII mode", 1657 bare_lfs); 1658 lreply(0, "File may not have transferred correctly."); 1659 } 1660 rval = 0; 1661 goto cleanup_recv_data; 1662 1663 default: 1664 reply(550, "Unimplemented TYPE %d in receive_data", type); 1665 goto cleanup_recv_data; 1666 } 1667 1668 data_err: 1669 (void) alarm(0); 1670 perror_reply(426, "Data Connection"); 1671 goto cleanup_recv_data; 1672 1673 file_err: 1674 (void) alarm(0); 1675 perror_reply(452, "Error writing file"); 1676 goto cleanup_recv_data; 1677 1678 cleanup_recv_data: 1679 (void) alarm(0); 1680 transflag = 0; 1681 total_files_in++; 1682 total_files++; 1683 total_xfers_in++; 1684 total_xfers++; 1685 return (rval); 1686 } 1687 1688 void 1689 statfilecmd(filename) 1690 const char *filename; 1691 { 1692 FILE *fin; 1693 int c; 1694 char *argv[] = { INTERNAL_LS, "-lgA", "", NULL }; 1695 1696 argv[2] = (char *)filename; 1697 fin = ftpd_popen(argv, "r", STDOUT_FILENO); 1698 lreply(211, "status of %s:", filename); 1699 while ((c = getc(fin)) != EOF) { 1700 if (c == '\n') { 1701 if (ferror(stdout)){ 1702 perror_reply(421, "control connection"); 1703 (void) ftpd_pclose(fin); 1704 dologout(1); 1705 /* NOTREACHED */ 1706 } 1707 if (ferror(fin)) { 1708 perror_reply(551, filename); 1709 (void) ftpd_pclose(fin); 1710 return; 1711 } 1712 (void) putchar('\r'); 1713 total_bytes++; 1714 total_bytes_out++; 1715 } 1716 (void) putchar(c); 1717 total_bytes++; 1718 total_bytes_out++; 1719 } 1720 (void) ftpd_pclose(fin); 1721 reply(211, "End of Status"); 1722 } 1723 1724 void 1725 statcmd() 1726 { 1727 union sockunion *su = NULL; 1728 static char ntop_buf[INET6_ADDRSTRLEN]; 1729 u_char *a, *p; 1730 int ispassive; 1731 off_t b, otbi, otbo, otb; 1732 1733 a = p = (u_char *)NULL; 1734 1735 lreply(211, "%s FTP server status:", hostname); 1736 lreply(0, "%s", version); 1737 ntop_buf[0] = '\0'; 1738 if (!getnameinfo((struct sockaddr *)&his_addr, his_addr.su_len, 1739 ntop_buf, sizeof(ntop_buf), NULL, 0, NI_NUMERICHOST) 1740 && strcmp(remotehost, ntop_buf) != 0) { 1741 lreply(0, "Connected to %s (%s)", remotehost, ntop_buf); 1742 } else 1743 lreply(0, "Connected to %s", remotehost); 1744 if (logged_in) { 1745 if (curclass.type == CLASS_GUEST) 1746 lreply(0, "Logged in anonymously"); 1747 else 1748 lreply(0, "Logged in as %s%s", pw->pw_name, 1749 curclass.type == CLASS_CHROOT ? " (chroot)" : ""); 1750 } else if (askpasswd) 1751 lreply(0, "Waiting for password"); 1752 else 1753 lreply(0, "Waiting for user name"); 1754 b = printf(" TYPE: %s", typenames[type]); 1755 total_bytes += b; 1756 total_bytes_out += b; 1757 if (type == TYPE_A || type == TYPE_E) { 1758 b = printf(", FORM: %s", formnames[form]); 1759 total_bytes += b; 1760 total_bytes_out += b; 1761 } 1762 if (type == TYPE_L) { 1763 #if NBBY == 8 1764 b = printf(" %d", NBBY); 1765 #else 1766 /* XXX: `bytesize' needs to be defined in this case */ 1767 b = printf(" %d", bytesize); 1768 #endif 1769 total_bytes += b; 1770 total_bytes_out += b; 1771 } 1772 b = printf("; STRUcture: %s; transfer MODE: %s\r\n", 1773 strunames[stru], modenames[mode]); 1774 total_bytes += b; 1775 total_bytes_out += b; 1776 ispassive = 0; 1777 if (data != -1) { 1778 lreply(0, "Data connection open"); 1779 su = NULL; 1780 } else if (pdata != -1) { 1781 b = printf(" in Passive mode"); 1782 total_bytes += b; 1783 total_bytes_out += b; 1784 su = (union sockunion *)&pasv_addr; 1785 ispassive = 1; 1786 goto printaddr; 1787 } else if (usedefault == 0) { 1788 if (epsvall) { 1789 b = printf("211- EPSV only mode (EPSV ALL )\r\n"); 1790 total_bytes += b; 1791 total_bytes_out += b; 1792 goto epsvonly; 1793 } 1794 b = printf("211- %s", 1795 (data_dest.su_family == AF_INET) ? "PORT" : "LPRT"); 1796 total_bytes += b; 1797 total_bytes_out += b; 1798 su = (union sockunion *)&data_dest; 1799 printaddr: 1800 /* PASV/PORT */ 1801 if (su->su_family == AF_INET) { 1802 if (ispassive) 1803 b = printf("211- PASV "); 1804 else 1805 b = printf("211- PORT "); 1806 a = (u_char *) &su->su_sin.sin_addr; 1807 p = (u_char *) &su->su_sin.sin_port; 1808 #define UC(b) (((int) b) & 0xff) 1809 b += printf("(%d,%d,%d,%d,%d,%d)\r\n", 1810 UC(a[0]), UC(a[1]), UC(a[2]), UC(a[3]), 1811 UC(p[0]), UC(p[1])); 1812 total_bytes += b; 1813 total_bytes_out += b; 1814 } 1815 1816 /* LPSV/LPRT */ 1817 { 1818 int alen, af, i; 1819 1820 alen = 0; 1821 switch (su->su_family) { 1822 case AF_INET: 1823 a = (u_char *) &su->su_sin.sin_addr; 1824 p = (u_char *) &su->su_sin.sin_port; 1825 alen = sizeof(su->su_sin.sin_addr); 1826 af = 4; 1827 break; 1828 case AF_INET6: 1829 a = (u_char *) &su->su_sin6.sin6_addr; 1830 p = (u_char *) &su->su_sin6.sin6_port; 1831 alen = sizeof(su->su_sin6.sin6_addr); 1832 af = 6; 1833 break; 1834 default: 1835 af = 0; 1836 break; 1837 } 1838 if (af) { 1839 if (ispassive) 1840 b = printf("211- LPSV "); 1841 else 1842 b = printf("211- LPRT "); 1843 printf("(%d,%d", af, alen); 1844 for (i = 0; i < alen; i++) 1845 b += printf("%d,", UC(a[alen])); 1846 b += printf("%d,%d,%d)\r\n", 2, UC(p[0]), UC(p[1])); 1847 total_bytes += b; 1848 total_bytes_out += b; 1849 #undef UC 1850 } 1851 } 1852 1853 /* EPRT/EPSV */ 1854 epsvonly:; 1855 { 1856 int af; 1857 1858 switch (su->su_family) { 1859 case AF_INET: 1860 af = 1; 1861 break; 1862 case AF_INET6: 1863 af = 2; 1864 break; 1865 default: 1866 af = 0; 1867 break; 1868 } 1869 if (af) { 1870 if (getnameinfo((struct sockaddr *)su, su->su_len, 1871 ntop_buf, sizeof(ntop_buf), NULL, 0, 1872 NI_NUMERICHOST) == 0) { 1873 if (ispassive) 1874 b = printf("211 - EPSV "); 1875 else 1876 b = printf("211 - EPRT "); 1877 b += printf("(|%d|%s|%d|)\r\n", 1878 af, ntop_buf, ntohs(su->su_port)); 1879 total_bytes += b; 1880 total_bytes_out += b; 1881 } 1882 } 1883 } 1884 } else 1885 lreply(0, "No data connection"); 1886 1887 if (logged_in) { 1888 lreply(0, "Data sent: %qd byte%s in %qd file%s", 1889 (qdfmt_t)total_data_out, PLURAL(total_data_out), 1890 (qdfmt_t)total_files_out, PLURAL(total_files_out)); 1891 lreply(0, "Data received: %qd byte%s in %qd file%s", 1892 (qdfmt_t)total_data_in, PLURAL(total_data_in), 1893 (qdfmt_t)total_files_in, PLURAL(total_files_in)); 1894 lreply(0, "Total data: %qd byte%s in %qd file%s", 1895 (qdfmt_t)total_data, PLURAL(total_data), 1896 (qdfmt_t)total_files, PLURAL(total_files)); 1897 } 1898 otbi = total_bytes_in; 1899 otbo = total_bytes_out; 1900 otb = total_bytes; 1901 lreply(0, "Traffic sent: %qd byte%s in %qd transfer%s", 1902 (qdfmt_t)otbo, PLURAL(otbo), 1903 (qdfmt_t)total_xfers_out, PLURAL(total_xfers_out)); 1904 lreply(0, "Traffic received: %qd byte%s in %qd transfer%s", 1905 (qdfmt_t)otbi, PLURAL(otbi), 1906 (qdfmt_t)total_xfers_in, PLURAL(total_xfers_in)); 1907 lreply(0, "Total traffic: %qd byte%s in %qd transfer%s", 1908 (qdfmt_t)otb, PLURAL(otb), 1909 (qdfmt_t)total_xfers, PLURAL(total_xfers)); 1910 1911 if (logged_in) { 1912 struct ftpconv *cp; 1913 1914 lreply(0, ""); 1915 lreply(0, "Class: %s, type: %s", 1916 curclass.classname, CURCLASSTYPE); 1917 lreply(0, "Check PORT/LPRT commands: %sabled", 1918 curclass.checkportcmd ? "en" : "dis"); 1919 if (curclass.display != NULL) 1920 lreply(0, "Display file: %s", curclass.display); 1921 if (curclass.notify != NULL) 1922 lreply(0, "Notify fileglob: %s", curclass.notify); 1923 lreply(0, "Idle timeout: %d, maximum timeout: %d", 1924 curclass.timeout, curclass.maxtimeout); 1925 lreply(0, "Current connections: %d", connections); 1926 if (curclass.limit == -1) 1927 lreply(0, "Maximum connections: unlimited"); 1928 else 1929 lreply(0, "Maximum connections: %d", curclass.limit); 1930 if (curclass.limitfile) 1931 lreply(0, "Connection limit exceeded file: %s", 1932 curclass.limitfile); 1933 if (curclass.motd != NULL) 1934 lreply(0, "MotD file: %s", curclass.motd); 1935 lreply(0, 1936 "Modify commands (CHMOD, DELE, MKD, RMD, RNFR, UMASK): %sabled", 1937 curclass.modify ? "en" : "dis"); 1938 lreply(0, 1939 "Upload commands (APPE, STOR, STOU): %sabled", 1940 curclass.upload ? "en" : "dis"); 1941 if (curclass.portmin && curclass.portmax) 1942 lreply(0, "PASV port range: %d - %d", 1943 curclass.portmin, curclass.portmax); 1944 if (curclass.rateget) 1945 lreply(0, "Rate get limit: %d bytes/sec", 1946 curclass.rateget); 1947 else 1948 lreply(0, "Rate get limit: disabled"); 1949 if (curclass.rateput) 1950 lreply(0, "Rate put limit: %d bytes/sec", 1951 curclass.rateput); 1952 else 1953 lreply(0, "Rate put limit: disabled"); 1954 lreply(0, "Umask: %.04o", curclass.umask); 1955 for (cp = curclass.conversions; cp != NULL; cp=cp->next) { 1956 if (cp->suffix == NULL || cp->types == NULL || 1957 cp->command == NULL) 1958 continue; 1959 lreply(0, 1960 "Conversion: %s [%s] disable: %s, command: %s", 1961 cp->suffix, cp->types, cp->disable, cp->command); 1962 } 1963 } 1964 1965 reply(211, "End of status"); 1966 } 1967 1968 void 1969 fatal(s) 1970 const char *s; 1971 { 1972 1973 reply(451, "Error in server: %s\n", s); 1974 reply(221, "Closing connection due to server error."); 1975 dologout(0); 1976 /* NOTREACHED */ 1977 } 1978 1979 void 1980 #ifdef __STDC__ 1981 reply(int n, const char *fmt, ...) 1982 #else 1983 reply(n, fmt, va_alist) 1984 int n; 1985 char *fmt; 1986 va_dcl 1987 #endif 1988 { 1989 off_t b; 1990 va_list ap; 1991 #ifdef __STDC__ 1992 va_start(ap, fmt); 1993 #else 1994 va_start(ap); 1995 #endif 1996 b = 0; 1997 b += printf("%d ", n); 1998 b += vprintf(fmt, ap); 1999 b += printf("\r\n"); 2000 total_bytes += b; 2001 total_bytes_out += b; 2002 (void)fflush(stdout); 2003 if (debug) { 2004 syslog(LOG_DEBUG, "<--- %d ", n); 2005 vsyslog(LOG_DEBUG, fmt, ap); 2006 } 2007 } 2008 2009 void 2010 #ifdef __STDC__ 2011 lreply(int n, const char *fmt, ...) 2012 #else 2013 lreply(n, fmt, va_alist) 2014 int n; 2015 char *fmt; 2016 va_dcl 2017 #endif 2018 { 2019 off_t b; 2020 va_list ap; 2021 #ifdef __STDC__ 2022 va_start(ap, fmt); 2023 #else 2024 va_start(ap); 2025 #endif 2026 b = 0; 2027 switch (n) { 2028 case 0: 2029 b += printf(" "); 2030 case -1: 2031 break; 2032 default: 2033 b += printf("%d-", n); 2034 break; 2035 } 2036 b += vprintf(fmt, ap); 2037 b += printf("\r\n"); 2038 total_bytes += b; 2039 total_bytes_out += b; 2040 (void)fflush(stdout); 2041 if (debug) { 2042 syslog(LOG_DEBUG, "<--- %d- ", n); 2043 vsyslog(LOG_DEBUG, fmt, ap); 2044 } 2045 } 2046 2047 static void 2048 ack(s) 2049 const char *s; 2050 { 2051 2052 reply(250, "%s command successful.", s); 2053 } 2054 2055 void 2056 delete(name) 2057 const char *name; 2058 { 2059 char *p = NULL; 2060 2061 if (remove(name) < 0) { 2062 p = strerror(errno); 2063 perror_reply(550, name); 2064 } else 2065 ack("DELE"); 2066 logcmd("delete", -1, name, NULL, NULL, p); 2067 } 2068 2069 void 2070 cwd(path) 2071 const char *path; 2072 { 2073 2074 if (chdir(path) < 0) 2075 perror_reply(550, path); 2076 else { 2077 show_chdir_messages(250); 2078 ack("CWD"); 2079 } 2080 } 2081 2082 static void 2083 replydirname(name, message) 2084 const char *name, *message; 2085 { 2086 char npath[MAXPATHLEN]; 2087 int i; 2088 2089 for (i = 0; *name != '\0' && i < sizeof(npath) - 1; i++, name++) { 2090 npath[i] = *name; 2091 if (*name == '"') 2092 npath[++i] = '"'; 2093 } 2094 npath[i] = '\0'; 2095 reply(257, "\"%s\" %s", npath, message); 2096 } 2097 2098 void 2099 makedir(name) 2100 const char *name; 2101 { 2102 char *p = NULL; 2103 2104 if (mkdir(name, 0777) < 0) { 2105 p = strerror(errno); 2106 perror_reply(550, name); 2107 } else 2108 replydirname(name, "directory created."); 2109 logcmd("mkdir", -1, name, NULL, NULL, p); 2110 } 2111 2112 void 2113 removedir(name) 2114 const char *name; 2115 { 2116 char *p = NULL; 2117 2118 if (rmdir(name) < 0) { 2119 p = strerror(errno); 2120 perror_reply(550, name); 2121 } else 2122 ack("RMD"); 2123 logcmd("rmdir", -1, name, NULL, NULL, p); 2124 } 2125 2126 void 2127 pwd() 2128 { 2129 char path[MAXPATHLEN]; 2130 2131 if (getcwd(path, sizeof(path) - 1) == NULL) 2132 reply(550, "Can't get the current directory: %s.", 2133 strerror(errno)); 2134 else 2135 replydirname(path, "is the current directory."); 2136 } 2137 2138 char * 2139 renamefrom(name) 2140 char *name; 2141 { 2142 struct stat st; 2143 2144 if (stat(name, &st) < 0) { 2145 perror_reply(550, name); 2146 return (NULL); 2147 } 2148 reply(350, "File exists, ready for destination name"); 2149 return (xstrdup(name)); 2150 } 2151 2152 void 2153 renamecmd(from, to) 2154 const char *from, *to; 2155 { 2156 char *p = NULL; 2157 2158 if (rename(from, to) < 0) { 2159 p = strerror(errno); 2160 perror_reply(550, "rename"); 2161 } else 2162 ack("RNTO"); 2163 logcmd("rename", -1, from, to, NULL, p); 2164 } 2165 2166 static void 2167 dolog(who) 2168 struct sockaddr *who; 2169 { 2170 getnameinfo(who, who->sa_len, remotehost, sizeof(remotehost), NULL,0,0); 2171 #ifdef HASSETPROCTITLE 2172 snprintf(proctitle, sizeof(proctitle), "%s: connected", remotehost); 2173 setproctitle(proctitle); 2174 #endif /* HASSETPROCTITLE */ 2175 if (logging) 2176 syslog(LOG_INFO, "connection from %s to %s", 2177 remotehost, hostname); 2178 } 2179 2180 /* 2181 * Record logout in wtmp file 2182 * and exit with supplied status. 2183 */ 2184 void 2185 dologout(status) 2186 int status; 2187 { 2188 /* 2189 * Prevent reception of SIGURG from resulting in a resumption 2190 * back to the main program loop. 2191 */ 2192 transflag = 0; 2193 2194 if (logged_in) { 2195 (void) seteuid((uid_t)0); 2196 logwtmp(ttyline, "", ""); 2197 if (doutmp) 2198 logout(utmp.ut_line); 2199 #ifdef KERBEROS 2200 if (!notickets && krbtkfile_env) 2201 unlink(krbtkfile_env); 2202 #endif 2203 } 2204 /* beware of flushing buffers after a SIGPIPE */ 2205 _exit(status); 2206 } 2207 2208 static void 2209 myoob(signo) 2210 int signo; 2211 { 2212 char *cp; 2213 2214 /* only process if transfer occurring */ 2215 if (!transflag) 2216 return; 2217 cp = tmpline; 2218 if (getline(cp, 7, stdin) == NULL) { 2219 reply(221, "You could at least say goodbye."); 2220 dologout(0); 2221 } 2222 if (strcasecmp(cp, "ABOR\r\n") == 0) { 2223 tmpline[0] = '\0'; 2224 reply(426, "Transfer aborted. Data connection closed."); 2225 reply(226, "Abort successful"); 2226 longjmp(urgcatch, 1); 2227 } 2228 if (strcasecmp(cp, "STAT\r\n") == 0) { 2229 tmpline[0] = '\0'; 2230 if (file_size != (off_t) -1) 2231 reply(213, "Status: %qd of %qd byte%s transferred", 2232 (qdfmt_t)byte_count, (qdfmt_t)file_size, 2233 PLURAL(byte_count)); 2234 else 2235 reply(213, "Status: %qd byte%s transferred", 2236 (qdfmt_t)byte_count, PLURAL(byte_count)); 2237 } 2238 } 2239 2240 static int 2241 bind_pasv_addr() 2242 { 2243 static int passiveport; 2244 int port, len; 2245 2246 len = pasv_addr.su_len; 2247 if (curclass.portmin == 0 && curclass.portmax == 0) { 2248 pasv_addr.su_port = 0; 2249 return (bind(pdata, (struct sockaddr *)&pasv_addr, len)); 2250 } 2251 2252 if (passiveport == 0) { 2253 srand(getpid()); 2254 passiveport = rand() % (curclass.portmax - curclass.portmin) 2255 + curclass.portmin; 2256 } 2257 2258 port = passiveport; 2259 while (1) { 2260 port++; 2261 if (port > curclass.portmax) 2262 port = curclass.portmin; 2263 else if (port == passiveport) { 2264 errno = EAGAIN; 2265 return (-1); 2266 } 2267 pasv_addr.su_port = htons(port); 2268 if (bind(pdata, (struct sockaddr *)&pasv_addr, len) == 0) 2269 break; 2270 if (errno != EADDRINUSE) 2271 return (-1); 2272 } 2273 passiveport = port; 2274 return (0); 2275 } 2276 2277 /* 2278 * Note: a response of 425 is not mentioned as a possible response to 2279 * the PASV command in RFC959. However, it has been blessed as 2280 * a legitimate response by Jon Postel in a telephone conversation 2281 * with Rick Adams on 25 Jan 89. 2282 */ 2283 void 2284 passive() 2285 { 2286 int len; 2287 char *p, *a; 2288 2289 if (pdata >= 0) 2290 close(pdata); 2291 pdata = socket(AF_INET, SOCK_STREAM, 0); 2292 if (pdata < 0 || !logged_in) { 2293 perror_reply(425, "Can't open passive connection"); 2294 return; 2295 } 2296 pasv_addr = ctrl_addr; 2297 2298 if (bind_pasv_addr() < 0) 2299 goto pasv_error; 2300 len = pasv_addr.su_len; 2301 if (getsockname(pdata, (struct sockaddr *) &pasv_addr, &len) < 0) 2302 goto pasv_error; 2303 if (listen(pdata, 1) < 0) 2304 goto pasv_error; 2305 a = (char *) &pasv_addr.su_sin.sin_addr; 2306 p = (char *) &pasv_addr.su_port; 2307 2308 #define UC(b) (((int) b) & 0xff) 2309 2310 reply(227, "Entering Passive Mode (%d,%d,%d,%d,%d,%d)", UC(a[0]), 2311 UC(a[1]), UC(a[2]), UC(a[3]), UC(p[0]), UC(p[1])); 2312 return; 2313 2314 pasv_error: 2315 (void) close(pdata); 2316 pdata = -1; 2317 perror_reply(425, "Can't open passive connection"); 2318 return; 2319 } 2320 2321 /* 2322 * 228 Entering Long Passive Mode (af, hal, h1, h2, h3,..., pal, p1, p2...) 2323 * 229 Entering Extended Passive Mode (|||port|) 2324 */ 2325 void 2326 long_passive(char *cmd, int pf) 2327 { 2328 int len; 2329 char *p, *a; 2330 2331 if (!logged_in) { 2332 syslog(LOG_NOTICE, "long passive but not logged in"); 2333 reply(503, "Login with USER first."); 2334 return; 2335 } 2336 2337 if (pf != PF_UNSPEC) { 2338 if (ctrl_addr.su_family != pf) { 2339 switch (ctrl_addr.su_family) { 2340 case AF_INET: 2341 pf = 1; 2342 break; 2343 case AF_INET6: 2344 pf = 2; 2345 break; 2346 default: 2347 pf = 0; 2348 break; 2349 } 2350 /* 2351 * XXX 2352 * only EPRT/EPSV ready clients will understand this 2353 */ 2354 if (strcmp(cmd, "EPSV") == 0 && pf) { 2355 reply(522, "Network protocol mismatch, " 2356 "use (%d)", pf); 2357 } else 2358 reply(501, "Network protocol mismatch"); /*XXX*/ 2359 2360 return; 2361 } 2362 } 2363 2364 if (pdata >= 0) 2365 close(pdata); 2366 pdata = socket(ctrl_addr.su_family, SOCK_STREAM, 0); 2367 if (pdata < 0) { 2368 perror_reply(425, "Can't open passive connection"); 2369 return; 2370 } 2371 pasv_addr = ctrl_addr; 2372 if (bind_pasv_addr() < 0) 2373 goto pasv_error; 2374 len = pasv_addr.su_len; 2375 if (getsockname(pdata, (struct sockaddr *) &pasv_addr, &len) < 0) 2376 goto pasv_error; 2377 if (listen(pdata, 1) < 0) 2378 goto pasv_error; 2379 p = (char *) &pasv_addr.su_port; 2380 2381 #define UC(b) (((int) b) & 0xff) 2382 2383 if (strcmp(cmd, "LPSV") == 0) { 2384 switch (pasv_addr.su_family) { 2385 case AF_INET: 2386 a = (char *) &pasv_addr.su_sin.sin_addr; 2387 reply(228, "Entering Long Passive Mode (%d,%d,%d,%d,%d,%d,%d,%d,%d)", 2388 4, 4, UC(a[0]), UC(a[1]), UC(a[2]), UC(a[3]), 2389 2, UC(p[0]), UC(p[1])); 2390 return; 2391 case AF_INET6: 2392 a = (char *) &pasv_addr.su_sin6.sin6_addr; 2393 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)", 2394 6, 16, 2395 UC(a[0]), UC(a[1]), UC(a[2]), UC(a[3]), 2396 UC(a[4]), UC(a[5]), UC(a[6]), UC(a[7]), 2397 UC(a[8]), UC(a[9]), UC(a[10]), UC(a[11]), 2398 UC(a[12]), UC(a[13]), UC(a[14]), UC(a[15]), 2399 2, UC(p[0]), UC(p[1])); 2400 return; 2401 } 2402 #undef UC 2403 } else if (strcmp(cmd, "EPSV") == 0) { 2404 switch (pasv_addr.su_family) { 2405 case AF_INET: 2406 case AF_INET6: 2407 reply(229, "Entering Extended Passive Mode (|||%d|)", 2408 ntohs(pasv_addr.su_port)); 2409 return; 2410 } 2411 } else { 2412 /* more proper error code? */ 2413 } 2414 2415 pasv_error: 2416 (void) close(pdata); 2417 pdata = -1; 2418 perror_reply(425, "Can't open passive connection"); 2419 return; 2420 } 2421 2422 /* 2423 * Generate unique name for file with basename "local". 2424 * The file named "local" is already known to exist. 2425 * Generates failure reply on error. 2426 * 2427 * XXX this function should under go changes similar to 2428 * the mktemp(3)/mkstemp(3) changes. 2429 */ 2430 static char * 2431 gunique(local) 2432 const char *local; 2433 { 2434 static char new[MAXPATHLEN]; 2435 struct stat st; 2436 char *cp; 2437 int count; 2438 2439 cp = strrchr(local, '/'); 2440 if (cp) 2441 *cp = '\0'; 2442 if (stat(cp ? local : ".", &st) < 0) { 2443 perror_reply(553, cp ? local : "."); 2444 return (NULL); 2445 } 2446 if (cp) 2447 *cp = '/'; 2448 for (count = 1; count < 100; count++) { 2449 (void)snprintf(new, sizeof(new) - 1, "%s.%d", local, count); 2450 if (stat(new, &st) < 0) 2451 return (new); 2452 } 2453 reply(452, "Unique file name cannot be created."); 2454 return (NULL); 2455 } 2456 2457 /* 2458 * Format and send reply containing system error number. 2459 */ 2460 void 2461 perror_reply(code, string) 2462 int code; 2463 const char *string; 2464 { 2465 int save_errno; 2466 2467 save_errno = errno; 2468 reply(code, "%s: %s.", string, strerror(errno)); 2469 errno = save_errno; 2470 } 2471 2472 static char *onefile[] = { 2473 "", 2474 0 2475 }; 2476 2477 void 2478 send_file_list(whichf) 2479 const char *whichf; 2480 { 2481 struct stat st; 2482 DIR *dirp = NULL; 2483 struct dirent *dir; 2484 FILE *dout = NULL; 2485 char **dirlist, *dirname, *p; 2486 int simple = 0; 2487 int freeglob = 0; 2488 glob_t gl; 2489 off_t b; 2490 2491 #ifdef __GNUC__ 2492 (void) &dout; 2493 (void) &dirlist; 2494 (void) &simple; 2495 (void) &freeglob; 2496 #endif 2497 2498 p = NULL; 2499 if (strpbrk(whichf, "~{[*?") != NULL) { 2500 int flags = GLOB_BRACE|GLOB_NOCHECK|GLOB_TILDE; 2501 2502 memset(&gl, 0, sizeof(gl)); 2503 freeglob = 1; 2504 if (glob(whichf, flags, 0, &gl)) { 2505 reply(550, "not found"); 2506 goto out; 2507 } else if (gl.gl_pathc == 0) { 2508 errno = ENOENT; 2509 perror_reply(550, whichf); 2510 goto out; 2511 } 2512 dirlist = gl.gl_pathv; 2513 } else { 2514 p = xstrdup(whichf); 2515 onefile[0] = p; 2516 dirlist = onefile; 2517 simple = 1; 2518 } 2519 /* XXX: } for vi sm */ 2520 2521 if (setjmp(urgcatch)) { 2522 transflag = 0; 2523 goto out; 2524 } 2525 while ((dirname = *dirlist++) != NULL) { 2526 int trailingslash = 0; 2527 2528 if (stat(dirname, &st) < 0) { 2529 /* 2530 * If user typed "ls -l", etc, and the client 2531 * used NLST, do what the user meant. 2532 */ 2533 /* XXX: nuke this support? */ 2534 if (dirname[0] == '-' && *dirlist == NULL && 2535 transflag == 0) { 2536 char *argv[] = { INTERNAL_LS, "", NULL }; 2537 2538 argv[1] = dirname; 2539 retrieve(argv, dirname); 2540 goto out; 2541 } 2542 perror_reply(550, whichf); 2543 if (dout != NULL) { 2544 (void) fclose(dout); 2545 transflag = 0; 2546 data = -1; 2547 pdata = -1; 2548 } 2549 goto out; 2550 } 2551 2552 if (S_ISREG(st.st_mode)) { 2553 if (dout == NULL) { 2554 dout = dataconn("file list", (off_t)-1, "w"); 2555 if (dout == NULL) 2556 goto out; 2557 transflag++; 2558 } 2559 b = fprintf(dout, "%s%s\n", dirname, 2560 type == TYPE_A ? "\r" : ""); 2561 total_bytes += b; 2562 total_bytes_out += b; 2563 byte_count += strlen(dirname) + 1; 2564 continue; 2565 } else if (!S_ISDIR(st.st_mode)) 2566 continue; 2567 2568 if (dirname[strlen(dirname) - 1] == '/') 2569 trailingslash++; 2570 2571 if ((dirp = opendir(dirname)) == NULL) 2572 continue; 2573 2574 while ((dir = readdir(dirp)) != NULL) { 2575 char nbuf[MAXPATHLEN]; 2576 2577 if (dir->d_name[0] == '.' && dir->d_namlen == 1) 2578 continue; 2579 if (dir->d_name[0] == '.' && dir->d_name[1] == '.' && 2580 dir->d_namlen == 2) 2581 continue; 2582 2583 (void)snprintf(nbuf, sizeof(nbuf), "%s%s%s", dirname, 2584 trailingslash ? "" : "/", dir->d_name); 2585 2586 /* 2587 * We have to do a stat to ensure it's 2588 * not a directory or special file. 2589 */ 2590 /* XXX: follow RFC959 and filter out non files ? */ 2591 if (simple || (stat(nbuf, &st) == 0 && 2592 S_ISREG(st.st_mode))) { 2593 char *p; 2594 2595 if (dout == NULL) { 2596 dout = dataconn("file list", (off_t)-1, 2597 "w"); 2598 if (dout == NULL) 2599 goto out; 2600 transflag++; 2601 } 2602 p = nbuf; 2603 if (nbuf[0] == '.' && nbuf[1] == '/') 2604 p = &nbuf[2]; 2605 b = fprintf(dout, "%s%s\n", p, 2606 type == TYPE_A ? "\r" : ""); 2607 total_bytes += b; 2608 total_bytes_out += b; 2609 byte_count += strlen(nbuf) + 1; 2610 } 2611 } 2612 (void) closedir(dirp); 2613 } 2614 2615 if (dout == NULL) 2616 reply(550, "No files found."); 2617 else if (ferror(dout) != 0) 2618 perror_reply(550, "Data connection"); 2619 else 2620 reply(226, "Transfer complete."); 2621 2622 transflag = 0; 2623 if (dout != NULL) 2624 (void) fclose(dout); 2625 data = -1; 2626 pdata = -1; 2627 out: 2628 total_xfers++; 2629 total_xfers_out++; 2630 if (p) 2631 free(p); 2632 if (freeglob) 2633 globfree(&gl); 2634 } 2635 2636 char * 2637 conffilename(s) 2638 const char *s; 2639 { 2640 static char filename[MAXPATHLEN]; 2641 2642 if (*s == '/') 2643 strlcpy(filename, s, sizeof(filename)); 2644 else 2645 (void)snprintf(filename, sizeof(filename), "%s/%s", confdir ,s); 2646 return (filename); 2647 } 2648 2649 /* 2650 * logcmd -- 2651 * based on the arguments, syslog a message: 2652 * if bytes != -1 "<command> <file1> = <bytes> bytes" 2653 * else if file2 != NULL "<command> <file1> <file2>" 2654 * else "<command> <file1>" 2655 * if elapsed != NULL, append "in xxx.yyy seconds" 2656 * if error != NULL, append ": " + error 2657 */ 2658 2659 void 2660 logcmd(command, bytes, file1, file2, elapsed, error) 2661 const char *command; 2662 off_t bytes; 2663 const char *file1; 2664 const char *file2; 2665 const struct timeval *elapsed; 2666 const char *error; 2667 { 2668 char buf[MAXPATHLEN * 2 + 100], realfile[MAXPATHLEN]; 2669 const char *p; 2670 size_t len; 2671 2672 if (logging <=1) 2673 return; 2674 2675 if ((p = realpath(file1, realfile)) == NULL) { 2676 #if 0 /* XXX: too noisy */ 2677 syslog(LOG_WARNING, "realpath `%s' failed: %s", 2678 realfile, strerror(errno)); 2679 #endif 2680 p = file1; 2681 } 2682 len = snprintf(buf, sizeof(buf), "%s %s", command, p); 2683 2684 if (bytes != (off_t)-1) { 2685 len += snprintf(buf + len, sizeof(buf) - len, 2686 " = %qd byte%s", (qdfmt_t) bytes, PLURAL(bytes)); 2687 } else if (file2 != NULL) { 2688 if ((p = realpath(file2, realfile)) == NULL) { 2689 #if 0 /* XXX: too noisy */ 2690 syslog(LOG_WARNING, "realpath `%s' failed: %s", 2691 realfile, strerror(errno)); 2692 #endif 2693 p = file2; 2694 } 2695 len += snprintf(buf + len, sizeof(buf) - len, " %s", p); 2696 } 2697 2698 if (elapsed != NULL) { 2699 len += snprintf(buf + len, sizeof(buf) - len, 2700 " in %ld.%.03d seconds", elapsed->tv_sec, 2701 (int)(elapsed->tv_usec / 1000)); 2702 } 2703 2704 if (error != NULL) 2705 len += snprintf(buf + len, sizeof(buf) - len, ": %s", error); 2706 2707 syslog(LOG_INFO, "%s", buf); 2708 } 2709 2710 char * 2711 xstrdup(s) 2712 const char *s; 2713 { 2714 char *new = strdup(s); 2715 2716 if (new == NULL) 2717 fatal("Local resource failure: malloc"); 2718 /* NOTREACHED */ 2719 return (new); 2720 } 2721
Indexes created Wed Sep 24 05:09:52 GMT 2025