ftpd.c revision 1.84
1 /* $NetBSD: ftpd.c,v 1.84 2000/01/12 22:39:28 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 1.84 2000/01/12 22:39:28 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 curclass.type = CLASS_REAL; 782 } 783 784 void 785 pass(passwd) 786 const char *passwd; 787 { 788 int rval; 789 const char *cp, *shell, *home; 790 char *class; 791 792 class = NULL; 793 if (logged_in || askpasswd == 0) { 794 reply(503, "Login with USER first."); 795 return; 796 } 797 askpasswd = 0; 798 if (curclass.type != CLASS_GUEST) { 799 /* "ftp" is only account allowed no password */ 800 if (pw == NULL) { 801 rval = 1; /* failure below */ 802 goto skip; 803 } 804 #if defined(KERBEROS) || defined(KERBEROS5) 805 if (klogin(pw, "", hostname, (char *)passwd) == 0) { 806 rval = 0; 807 goto skip; 808 } 809 #endif 810 #ifdef SKEY 811 if (skey_haskey(pw->pw_name) == 0) { 812 char *p; 813 int r; 814 815 p = xstrdup(passwd); 816 r = skey_passcheck(pw->pw_name, p); 817 free(p); 818 if (r != -1) { 819 rval = 0; 820 goto skip; 821 } 822 } 823 #endif 824 if (!sflag && *pw->pw_passwd != '\0' && 825 !strcmp(crypt(passwd, pw->pw_passwd), pw->pw_passwd)) { 826 rval = 0; 827 goto skip; 828 } 829 rval = 1; 830 831 skip: 832 if (pw != NULL && pw->pw_expire && time(NULL) >= pw->pw_expire) 833 rval = 2; 834 /* 835 * If rval > 0, the user failed the authentication check 836 * above. If rval == 0, either Kerberos or local authentication 837 * succeeded. 838 */ 839 if (rval) { 840 reply(530, rval == 2 ? "Password expired." : 841 "Login incorrect."); 842 if (logging) { 843 syslog(LOG_NOTICE, 844 "FTP LOGIN FAILED FROM %s", remotehost); 845 syslog(LOG_AUTHPRIV | LOG_NOTICE, 846 "FTP LOGIN FAILED FROM %s, %s", 847 remotehost, curname); 848 } 849 pw = NULL; 850 if (login_attempts++ >= 5) { 851 syslog(LOG_NOTICE, 852 "repeated login failures from %s", 853 remotehost); 854 exit(0); 855 } 856 return; 857 } 858 } 859 860 /* password was ok; see if anything else prevents login */ 861 if (! checkuser(_PATH_FTPUSERS, pw->pw_name, 1, 0, &class)) { 862 reply(530, "User %s may not use FTP.", pw->pw_name); 863 if (logging) 864 syslog(LOG_NOTICE, "FTP LOGIN REFUSED FROM %s, %s", 865 remotehost, pw->pw_name); 866 goto bad; 867 } 868 /* check for valid shell, if not guest user */ 869 if ((shell = pw->pw_shell) == NULL || *shell == 0) 870 shell = _PATH_BSHELL; 871 while ((cp = getusershell()) != NULL) 872 if (strcmp(cp, shell) == 0) 873 break; 874 endusershell(); 875 if (cp == NULL && curclass.type != CLASS_GUEST) { 876 reply(530, "User %s may not use FTP.", pw->pw_name); 877 if (logging) 878 syslog(LOG_NOTICE, "FTP LOGIN REFUSED FROM %s, %s", 879 remotehost, pw->pw_name); 880 goto bad; 881 } 882 883 login_attempts = 0; /* this time successful */ 884 if (setegid((gid_t)pw->pw_gid) < 0) { 885 reply(550, "Can't set gid."); 886 goto bad; 887 } 888 (void) initgroups(pw->pw_name, pw->pw_gid); 889 890 /* open wtmp before chroot */ 891 logwtmp(ttyline, pw->pw_name, remotehost); 892 893 /* open utmp before chroot */ 894 if (doutmp) { 895 memset((void *)&utmp, 0, sizeof(utmp)); 896 (void)time(&utmp.ut_time); 897 (void)strncpy(utmp.ut_name, pw->pw_name, sizeof(utmp.ut_name)); 898 (void)strncpy(utmp.ut_host, remotehost, sizeof(utmp.ut_host)); 899 (void)strncpy(utmp.ut_line, ttyline, sizeof(utmp.ut_line)); 900 login(&utmp); 901 } 902 903 logged_in = 1; 904 905 /* check user in /etc/ftpchroot */ 906 if (checkuser(_PATH_FTPCHROOT, pw->pw_name, 0, 0, NULL)) { 907 if (curclass.type == CLASS_GUEST) { 908 syslog(LOG_NOTICE, 909 "Can't change guest user to chroot class; remove entry in %s", 910 _PATH_FTPCHROOT); 911 exit(1); 912 } 913 curclass.type = CLASS_CHROOT; 914 } 915 if (class == NULL) { 916 switch (curclass.type) { 917 case CLASS_GUEST: 918 class = xstrdup("guest"); 919 break; 920 case CLASS_CHROOT: 921 class = xstrdup("chroot"); 922 break; 923 case CLASS_REAL: 924 class = xstrdup("real"); 925 break; 926 default: 927 abort(); 928 } 929 } 930 931 /* parse ftpd.conf, setting up various parameters */ 932 parse_conf(class); 933 count_users(); 934 if (curclass.limit != -1 && connections > curclass.limit) { 935 if (! EMPTYSTR(curclass.limitfile)) 936 (void)format_file(conffilename(curclass.limitfile),530); 937 reply(530, 938 "User %s access denied, connection limit of %d reached.", 939 pw->pw_name, curclass.limit); 940 syslog(LOG_NOTICE, 941 "Maximum connection limit of %d for class %s reached, login refused", 942 curclass.limit, curclass.classname); 943 goto bad; 944 } 945 946 home = "/"; 947 switch (curclass.type) { 948 case CLASS_GUEST: 949 /* 950 * We MUST do a chdir() after the chroot. Otherwise 951 * the old current directory will be accessible as "." 952 * outside the new root! 953 */ 954 if (chroot(anondir ? anondir : pw->pw_dir) < 0 || 955 chdir("/") < 0) { 956 reply(550, "Can't set guest privileges."); 957 goto bad; 958 } 959 break; 960 case CLASS_CHROOT: 961 if (chroot(pw->pw_dir) < 0 || chdir("/") < 0) { 962 reply(550, "Can't change root."); 963 goto bad; 964 } 965 break; 966 case CLASS_REAL: 967 if (chdir(pw->pw_dir) < 0) { 968 if (chdir("/") < 0) { 969 reply(530, 970 "User %s: can't change directory to %s.", 971 pw->pw_name, pw->pw_dir); 972 goto bad; 973 } else 974 lreply(230, 975 "No directory! Logging in with home=/"); 976 } else 977 home = pw->pw_dir; 978 break; 979 } 980 if (seteuid((uid_t)pw->pw_uid) < 0) { 981 reply(550, "Can't set uid."); 982 goto bad; 983 } 984 setenv("HOME", home, 1); 985 986 /* 987 * Display a login message, if it exists. 988 * N.B. reply(230,) must follow the message. 989 */ 990 (void)format_file(conffilename(curclass.motd), 230); 991 show_chdir_messages(230); 992 if (curclass.type == CLASS_GUEST) { 993 reply(230, "Guest login ok, access restrictions apply."); 994 #ifdef HASSETPROCTITLE 995 snprintf(proctitle, sizeof(proctitle), 996 "%s: anonymous/%.*s", remotehost, 997 (int) (sizeof(proctitle) - sizeof(remotehost) - 998 sizeof(": anonymous/")), passwd); 999 setproctitle(proctitle); 1000 #endif /* HASSETPROCTITLE */ 1001 if (logging) 1002 syslog(LOG_INFO, 1003 "ANONYMOUS FTP LOGIN FROM %s, %s (class: %s, type: %s)", 1004 remotehost, passwd, 1005 curclass.classname, CURCLASSTYPE); 1006 } else { 1007 reply(230, "User %s logged in.", pw->pw_name); 1008 #ifdef HASSETPROCTITLE 1009 snprintf(proctitle, sizeof(proctitle), 1010 "%s: %s", remotehost, pw->pw_name); 1011 setproctitle(proctitle); 1012 #endif /* HASSETPROCTITLE */ 1013 if (logging) 1014 syslog(LOG_INFO, 1015 "FTP LOGIN FROM %s as %s (class: %s, type: %s)", 1016 remotehost, pw->pw_name, 1017 curclass.classname, CURCLASSTYPE); 1018 } 1019 (void) umask(curclass.umask); 1020 goto cleanuppass; 1021 bad: 1022 /* Forget all about it... */ 1023 end_login(); 1024 cleanuppass: 1025 if (class) 1026 free(class); 1027 } 1028 1029 void 1030 retrieve(argv, name) 1031 char *argv[]; 1032 const char *name; 1033 { 1034 FILE *fin = NULL, *dout; 1035 struct stat st; 1036 int (*closefunc) __P((FILE *)) = NULL; 1037 int log, sendrv, closerv, stderrfd, isconversion, isdata, isls; 1038 struct timeval start, finish, td, *tdp; 1039 const char *dispname; 1040 1041 sendrv = closerv = stderrfd = -1; 1042 isconversion = isdata = isls = log = 0; 1043 tdp = NULL; 1044 dispname = name; 1045 if (argv == NULL) { 1046 log = 1; 1047 isdata = 1; 1048 fin = fopen(name, "r"); 1049 closefunc = fclose; 1050 if (fin == NULL) 1051 argv = do_conversion(name); 1052 if (argv != NULL) { 1053 isconversion++; 1054 syslog(LOG_INFO, "get command: '%s' on '%s'", 1055 argv[0], name); 1056 } 1057 } 1058 if (argv != NULL) { 1059 char temp[MAXPATHLEN]; 1060 1061 if (strcmp(argv[0], INTERNAL_LS) == 0) { 1062 isls = 1; 1063 stderrfd = -1; 1064 } else { 1065 (void)snprintf(temp, sizeof(temp), "%s", TMPFILE); 1066 stderrfd = mkstemp(temp); 1067 if (stderrfd != -1) 1068 (void)unlink(temp); 1069 } 1070 dispname = argv[0]; 1071 fin = ftpd_popen(argv, "r", stderrfd); 1072 closefunc = ftpd_pclose; 1073 st.st_size = -1; 1074 st.st_blksize = BUFSIZ; 1075 } 1076 if (fin == NULL) { 1077 if (errno != 0) { 1078 perror_reply(550, dispname); 1079 if (log) 1080 logcmd("get", -1, name, NULL, NULL, 1081 strerror(errno)); 1082 } 1083 goto cleanupretrieve; 1084 } 1085 byte_count = -1; 1086 if (argv == NULL 1087 && (fstat(fileno(fin), &st) < 0 || !S_ISREG(st.st_mode))) { 1088 reply(550, "%s: not a plain file.", dispname); 1089 goto done; 1090 } 1091 if (restart_point) { 1092 if (type == TYPE_A) { 1093 off_t i; 1094 int c; 1095 1096 for (i = 0; i < restart_point; i++) { 1097 if ((c=getc(fin)) == EOF) { 1098 perror_reply(550, dispname); 1099 goto done; 1100 } 1101 if (c == '\n') 1102 i++; 1103 } 1104 } else if (lseek(fileno(fin), restart_point, SEEK_SET) < 0) { 1105 perror_reply(550, dispname); 1106 goto done; 1107 } 1108 } 1109 dout = dataconn(dispname, st.st_size, "w"); 1110 if (dout == NULL) 1111 goto done; 1112 1113 (void)gettimeofday(&start, NULL); 1114 sendrv = send_data(fin, dout, st.st_blksize, isdata); 1115 (void)gettimeofday(&finish, NULL); 1116 (void) fclose(dout); 1117 timersub(&finish, &start, &td); 1118 tdp = &td; 1119 data = -1; 1120 pdata = -1; 1121 done: 1122 if (log) 1123 logcmd("get", byte_count, name, NULL, tdp, NULL); 1124 closerv = (*closefunc)(fin); 1125 if (sendrv == 0) { 1126 FILE *err; 1127 struct stat sb; 1128 1129 if (!isls && argv != NULL && closerv != 0) { 1130 lreply(226, 1131 "Command returned an exit status of %d", 1132 closerv); 1133 if (isconversion) 1134 syslog(LOG_INFO, 1135 "retrieve command: '%s' returned %d", 1136 argv[0], closerv); 1137 } 1138 if (!isls && argv != NULL && stderrfd != -1 && 1139 (fstat(stderrfd, &sb) == 0) && sb.st_size > 0 && 1140 ((err = fdopen(stderrfd, "r")) != NULL)) { 1141 char *cp, line[LINE_MAX]; 1142 1143 lreply(226, "Command error messages:"); 1144 rewind(err); 1145 while (fgets(line, sizeof(line), err) != NULL) { 1146 if ((cp = strchr(line, '\n')) != NULL) 1147 *cp = '\0'; 1148 lreply(0, " %s", line); 1149 } 1150 (void) fflush(stdout); 1151 (void) fclose(err); 1152 /* a reply(226,) must follow */ 1153 } 1154 reply(226, "Transfer complete."); 1155 } 1156 cleanupretrieve: 1157 if (stderrfd != -1) 1158 (void)close(stderrfd); 1159 if (isconversion) 1160 free(argv); 1161 } 1162 1163 void 1164 store(name, mode, unique) 1165 const char *name, *mode; 1166 int unique; 1167 { 1168 FILE *fout, *din; 1169 struct stat st; 1170 int (*closefunc) __P((FILE *)); 1171 struct timeval start, finish, td, *tdp; 1172 char *desc; 1173 1174 desc = (*mode == 'w') ? "put" : "append"; 1175 if (unique && stat(name, &st) == 0 && 1176 (name = gunique(name)) == NULL) { 1177 logcmd(desc, -1, name, NULL, NULL, "cannot create unique file"); 1178 return; 1179 } 1180 1181 if (restart_point) 1182 mode = "r+"; 1183 fout = fopen(name, mode); 1184 closefunc = fclose; 1185 tdp = NULL; 1186 if (fout == NULL) { 1187 perror_reply(553, name); 1188 logcmd(desc, -1, name, NULL, NULL, strerror(errno)); 1189 return; 1190 } 1191 byte_count = -1; 1192 if (restart_point) { 1193 if (type == TYPE_A) { 1194 off_t i; 1195 int c; 1196 1197 for (i = 0; i < restart_point; i++) { 1198 if ((c=getc(fout)) == EOF) { 1199 perror_reply(550, name); 1200 goto done; 1201 } 1202 if (c == '\n') 1203 i++; 1204 } 1205 /* 1206 * We must do this seek to "current" position 1207 * because we are changing from reading to 1208 * writing. 1209 */ 1210 if (fseek(fout, 0L, SEEK_CUR) < 0) { 1211 perror_reply(550, name); 1212 goto done; 1213 } 1214 } else if (lseek(fileno(fout), restart_point, SEEK_SET) < 0) { 1215 perror_reply(550, name); 1216 goto done; 1217 } 1218 } 1219 din = dataconn(name, (off_t)-1, "r"); 1220 if (din == NULL) 1221 goto done; 1222 (void)gettimeofday(&start, NULL); 1223 if (receive_data(din, fout) == 0) { 1224 if (unique) 1225 reply(226, "Transfer complete (unique file name:%s).", 1226 name); 1227 else 1228 reply(226, "Transfer complete."); 1229 } 1230 (void)gettimeofday(&finish, NULL); 1231 (void) fclose(din); 1232 timersub(&finish, &start, &td); 1233 tdp = &td; 1234 data = -1; 1235 pdata = -1; 1236 done: 1237 logcmd(desc, byte_count, name, NULL, tdp, NULL); 1238 (*closefunc)(fout); 1239 } 1240 1241 static FILE * 1242 getdatasock(mode) 1243 const char *mode; 1244 { 1245 int on = 1, s, t, tries; 1246 1247 if (data >= 0) 1248 return (fdopen(data, mode)); 1249 (void) seteuid((uid_t)0); 1250 s = socket(ctrl_addr.su_family, SOCK_STREAM, 0); 1251 if (s < 0) 1252 goto bad; 1253 if (setsockopt(s, SOL_SOCKET, SO_REUSEADDR, 1254 (char *) &on, sizeof(on)) < 0) 1255 goto bad; 1256 if (setsockopt(s, SOL_SOCKET, SO_KEEPALIVE, 1257 (char *) &on, sizeof(on)) < 0) 1258 goto bad; 1259 /* anchor socket to avoid multi-homing problems */ 1260 data_source = ctrl_addr; 1261 data_source.su_port = htons(20); /* ftp-data port */ 1262 for (tries = 1; ; tries++) { 1263 if (bind(s, (struct sockaddr *)&data_source, 1264 data_source.su_len) >= 0) 1265 break; 1266 if (errno != EADDRINUSE || tries > 10) 1267 goto bad; 1268 sleep(tries); 1269 } 1270 (void) seteuid((uid_t)pw->pw_uid); 1271 #ifdef IP_TOS 1272 if (!mapped && ctrl_addr.su_family == AF_INET) { 1273 on = IPTOS_THROUGHPUT; 1274 if (setsockopt(s, IPPROTO_IP, IP_TOS, (char *)&on, 1275 sizeof(int)) < 0) 1276 syslog(LOG_WARNING, "setsockopt (IP_TOS): %m"); 1277 } 1278 #endif 1279 return (fdopen(s, mode)); 1280 bad: 1281 /* Return the real value of errno (close may change it) */ 1282 t = errno; 1283 (void) seteuid((uid_t)pw->pw_uid); 1284 (void) close(s); 1285 errno = t; 1286 return (NULL); 1287 } 1288 1289 static FILE * 1290 dataconn(name, size, mode) 1291 const char *name; 1292 off_t size; 1293 const char *mode; 1294 { 1295 char sizebuf[32]; 1296 FILE *file; 1297 int retry = 0, tos, keepalive; 1298 1299 file_size = size; 1300 byte_count = 0; 1301 if (size != (off_t) -1) 1302 (void)snprintf(sizebuf, sizeof(sizebuf), " (%qd byte%s)", 1303 (qdfmt_t)size, PLURAL(size)); 1304 else 1305 sizebuf[0] = '\0'; 1306 if (pdata >= 0) { 1307 union sockunion from; 1308 int s, fromlen = sizeof(from); 1309 1310 (void) alarm(curclass.timeout); 1311 s = accept(pdata, (struct sockaddr *)&from, &fromlen); 1312 (void) alarm(0); 1313 if (s < 0) { 1314 reply(425, "Can't open data connection."); 1315 (void) close(pdata); 1316 pdata = -1; 1317 return (NULL); 1318 } 1319 (void) close(pdata); 1320 pdata = s; 1321 switch (from.su_family) { 1322 case AF_INET: 1323 #ifdef IP_TOS 1324 if (!mapped) { 1325 tos = IPTOS_THROUGHPUT; 1326 (void) setsockopt(s, IPPROTO_IP, IP_TOS, 1327 (char *)&tos, sizeof(int)); 1328 } 1329 break; 1330 #endif 1331 } 1332 /* Set keepalives on the socket to detect dropped conns. */ 1333 #ifdef SO_KEEPALIVE 1334 keepalive = 1; 1335 (void) setsockopt(s, SOL_SOCKET, SO_KEEPALIVE, 1336 (char *)&keepalive, sizeof(int)); 1337 #endif 1338 reply(150, "Opening %s mode data connection for '%s'%s.", 1339 type == TYPE_A ? "ASCII" : "BINARY", name, sizebuf); 1340 return (fdopen(pdata, mode)); 1341 } 1342 if (data >= 0) { 1343 reply(125, "Using existing data connection for '%s'%s.", 1344 name, sizebuf); 1345 usedefault = 1; 1346 return (fdopen(data, mode)); 1347 } 1348 if (usedefault) 1349 data_dest = his_addr; 1350 usedefault = 1; 1351 file = getdatasock(mode); 1352 if (file == NULL) { 1353 char hbuf[INET6_ADDRSTRLEN]; 1354 char pbuf[10]; 1355 getnameinfo((struct sockaddr *)&data_source, data_source.su_len, 1356 hbuf, sizeof(hbuf), pbuf, sizeof(pbuf), 1357 NI_NUMERICHOST | NI_NUMERICSERV); 1358 reply(425, "Can't create data socket (%s,%s): %s.", 1359 hbuf, pbuf, strerror(errno)); 1360 return (NULL); 1361 } 1362 data = fileno(file); 1363 while (connect(data, (struct sockaddr *)&data_dest, 1364 data_dest.su_len) < 0) { 1365 if (errno == EADDRINUSE && retry < swaitmax) { 1366 sleep((unsigned) swaitint); 1367 retry += swaitint; 1368 continue; 1369 } 1370 perror_reply(425, "Can't build data connection"); 1371 (void) fclose(file); 1372 data = -1; 1373 return (NULL); 1374 } 1375 reply(150, "Opening %s mode data connection for '%s'%s.", 1376 type == TYPE_A ? "ASCII" : "BINARY", name, sizebuf); 1377 return (file); 1378 } 1379 1380 /* 1381 * Tranfer the contents of "instr" to "outstr" peer using the appropriate 1382 * encapsulation of the data subject * to Mode, Structure, and Type. 1383 * 1384 * NB: Form isn't handled. 1385 */ 1386 static int 1387 send_data(instr, outstr, blksize, isdata) 1388 FILE *instr, *outstr; 1389 off_t blksize; 1390 int isdata; 1391 { 1392 int c, filefd, netfd, rval; 1393 char *buf; 1394 1395 transflag = 1; 1396 rval = -1; 1397 buf = NULL; 1398 if (setjmp(urgcatch)) 1399 goto cleanup_send_data; 1400 1401 switch (type) { 1402 1403 case TYPE_A: 1404 /* XXXX: rate limit ascii send (get) */ 1405 (void) alarm(curclass.timeout); 1406 while ((c = getc(instr)) != EOF) { 1407 byte_count++; 1408 if (c == '\n') { 1409 if (ferror(outstr)) 1410 goto data_err; 1411 (void) putc('\r', outstr); 1412 if (isdata) { 1413 total_data_out++; 1414 total_data++; 1415 } 1416 total_bytes_out++; 1417 total_bytes++; 1418 } 1419 (void) putc(c, outstr); 1420 if (isdata) { 1421 total_data_out++; 1422 total_data++; 1423 } 1424 total_bytes_out++; 1425 total_bytes++; 1426 if ((byte_count % 4096) == 0) 1427 (void) alarm(curclass.timeout); 1428 } 1429 (void) alarm(0); 1430 fflush(outstr); 1431 if (ferror(instr)) 1432 goto file_err; 1433 if (ferror(outstr)) 1434 goto data_err; 1435 rval = 0; 1436 goto cleanup_send_data; 1437 1438 case TYPE_I: 1439 case TYPE_L: 1440 if ((buf = malloc((size_t)blksize)) == NULL) { 1441 perror_reply(451, "Local resource failure: malloc"); 1442 goto cleanup_send_data; 1443 } 1444 filefd = fileno(instr); 1445 netfd = fileno(outstr); 1446 (void) alarm(curclass.timeout); 1447 if (curclass.rateget) { 1448 while (1) { 1449 int d; 1450 struct timeval then, now, td; 1451 off_t bufrem; 1452 char *bufp; 1453 1454 (void)gettimeofday(&then, NULL); 1455 errno = c = d = 0; 1456 bufrem = curclass.rateget; 1457 while (bufrem > 0) { 1458 if ((c = read(filefd, buf, 1459 MIN(blksize, bufrem))) <= 0) 1460 goto senddone; 1461 (void) alarm(curclass.timeout); 1462 bufrem -= c; 1463 byte_count += c; 1464 if (isdata) { 1465 total_data_out += c; 1466 total_data += c; 1467 } 1468 total_bytes_out += c; 1469 total_bytes += c; 1470 for (bufp = buf; c > 0; 1471 c -= d, bufp += d) 1472 if ((d = 1473 write(netfd, bufp, c)) <= 0) 1474 break; 1475 if (d < 0) 1476 goto data_err; 1477 } 1478 (void)gettimeofday(&now, NULL); 1479 timersub(&now, &then, &td); 1480 if (td.tv_sec > 0) 1481 break; 1482 usleep(1000000 - td.tv_usec); 1483 } 1484 } else { 1485 while ((c = read(filefd, buf, (size_t)blksize)) > 0) { 1486 if (write(netfd, buf, c) != c) 1487 goto data_err; 1488 (void) alarm(curclass.timeout); 1489 byte_count += c; 1490 if (isdata) { 1491 total_data_out += c; 1492 total_data += c; 1493 } 1494 total_bytes_out += c; 1495 total_bytes += c; 1496 } 1497 } 1498 senddone: 1499 if (c < 0) 1500 goto file_err; 1501 rval = 0; 1502 goto cleanup_send_data; 1503 1504 default: 1505 reply(550, "Unimplemented TYPE %d in send_data", type); 1506 goto cleanup_send_data; 1507 } 1508 1509 data_err: 1510 (void) alarm(0); 1511 perror_reply(426, "Data connection"); 1512 goto cleanup_send_data; 1513 1514 file_err: 1515 (void) alarm(0); 1516 perror_reply(551, "Error on input file"); 1517 /* FALLTHROUGH */ 1518 1519 cleanup_send_data: 1520 (void) alarm(0); 1521 transflag = 0; 1522 if (buf) 1523 free(buf); 1524 if (isdata) { 1525 total_files_out++; 1526 total_files++; 1527 } 1528 total_xfers_out++; 1529 total_xfers++; 1530 return (rval); 1531 } 1532 1533 /* 1534 * Transfer data from peer to "outstr" using the appropriate encapulation of 1535 * the data subject to Mode, Structure, and Type. 1536 * 1537 * N.B.: Form isn't handled. 1538 */ 1539 static int 1540 receive_data(instr, outstr) 1541 FILE *instr, *outstr; 1542 { 1543 int c, bare_lfs, netfd, filefd, rval; 1544 char buf[BUFSIZ]; 1545 #ifdef __GNUC__ 1546 (void) &bare_lfs; 1547 #endif 1548 1549 bare_lfs = 0; 1550 transflag = 1; 1551 rval = -1; 1552 if (setjmp(urgcatch)) 1553 goto cleanup_recv_data; 1554 1555 switch (type) { 1556 1557 case TYPE_I: 1558 case TYPE_L: 1559 netfd = fileno(instr); 1560 filefd = fileno(outstr); 1561 (void) alarm(curclass.timeout); 1562 if (curclass.rateput) { 1563 while (1) { 1564 int d; 1565 struct timeval then, now, td; 1566 off_t bufrem; 1567 1568 (void)gettimeofday(&then, NULL); 1569 errno = c = d = 0; 1570 for (bufrem = curclass.rateput; bufrem > 0; ) { 1571 if ((c = read(netfd, buf, 1572 MIN(sizeof(buf), bufrem))) <= 0) 1573 goto recvdone; 1574 if ((d = write(filefd, buf, c)) != c) 1575 goto recvdone; 1576 (void) alarm(curclass.timeout); 1577 bufrem -= c; 1578 byte_count += c; 1579 total_data_in += c; 1580 total_data += c; 1581 total_bytes_in += c; 1582 total_bytes += c; 1583 } 1584 (void)gettimeofday(&now, NULL); 1585 timersub(&now, &then, &td); 1586 if (td.tv_sec > 0) 1587 break; 1588 usleep(1000000 - td.tv_usec); 1589 } 1590 } else { 1591 while ((c = read(netfd, buf, sizeof(buf))) > 0) { 1592 if (write(filefd, buf, c) != c) 1593 goto file_err; 1594 (void) alarm(curclass.timeout); 1595 byte_count += c; 1596 total_data_in += c; 1597 total_data += c; 1598 total_bytes_in += c; 1599 total_bytes += c; 1600 } 1601 } 1602 recvdone: 1603 if (c < 0) 1604 goto data_err; 1605 rval = 0; 1606 goto cleanup_recv_data; 1607 1608 case TYPE_E: 1609 reply(553, "TYPE E not implemented."); 1610 goto cleanup_recv_data; 1611 1612 case TYPE_A: 1613 (void) alarm(curclass.timeout); 1614 /* XXXX: rate limit ascii receive (put) */ 1615 while ((c = getc(instr)) != EOF) { 1616 byte_count++; 1617 total_data_in++; 1618 total_data++; 1619 total_bytes_in++; 1620 total_bytes++; 1621 if ((byte_count % 4096) == 0) 1622 (void) alarm(curclass.timeout); 1623 if (c == '\n') 1624 bare_lfs++; 1625 while (c == '\r') { 1626 if (ferror(outstr)) 1627 goto data_err; 1628 if ((c = getc(instr)) != '\n') { 1629 byte_count++; 1630 total_data_in++; 1631 total_data++; 1632 total_bytes_in++; 1633 total_bytes++; 1634 if ((byte_count % 4096) == 0) 1635 (void) alarm(curclass.timeout); 1636 (void) putc ('\r', outstr); 1637 if (c == '\0' || c == EOF) 1638 goto contin2; 1639 } 1640 } 1641 (void) putc(c, outstr); 1642 contin2: ; 1643 } 1644 (void) alarm(0); 1645 fflush(outstr); 1646 if (ferror(instr)) 1647 goto data_err; 1648 if (ferror(outstr)) 1649 goto file_err; 1650 if (bare_lfs) { 1651 lreply(226, 1652 "WARNING! %d bare linefeeds received in ASCII mode", 1653 bare_lfs); 1654 lreply(0, "File may not have transferred correctly."); 1655 } 1656 rval = 0; 1657 goto cleanup_recv_data; 1658 1659 default: 1660 reply(550, "Unimplemented TYPE %d in receive_data", type); 1661 goto cleanup_recv_data; 1662 } 1663 1664 data_err: 1665 (void) alarm(0); 1666 perror_reply(426, "Data Connection"); 1667 goto cleanup_recv_data; 1668 1669 file_err: 1670 (void) alarm(0); 1671 perror_reply(452, "Error writing file"); 1672 goto cleanup_recv_data; 1673 1674 cleanup_recv_data: 1675 (void) alarm(0); 1676 transflag = 0; 1677 total_files_in++; 1678 total_files++; 1679 total_xfers_in++; 1680 total_xfers++; 1681 return (rval); 1682 } 1683 1684 void 1685 statfilecmd(filename) 1686 const char *filename; 1687 { 1688 FILE *fin; 1689 int c; 1690 char *argv[] = { INTERNAL_LS, "-lgA", "", NULL }; 1691 1692 argv[2] = (char *)filename; 1693 fin = ftpd_popen(argv, "r", STDOUT_FILENO); 1694 lreply(211, "status of %s:", filename); 1695 while ((c = getc(fin)) != EOF) { 1696 if (c == '\n') { 1697 if (ferror(stdout)){ 1698 perror_reply(421, "control connection"); 1699 (void) ftpd_pclose(fin); 1700 dologout(1); 1701 /* NOTREACHED */ 1702 } 1703 if (ferror(fin)) { 1704 perror_reply(551, filename); 1705 (void) ftpd_pclose(fin); 1706 return; 1707 } 1708 (void) putchar('\r'); 1709 total_bytes++; 1710 total_bytes_out++; 1711 } 1712 (void) putchar(c); 1713 total_bytes++; 1714 total_bytes_out++; 1715 } 1716 (void) ftpd_pclose(fin); 1717 reply(211, "End of Status"); 1718 } 1719 1720 void 1721 statcmd() 1722 { 1723 union sockunion *su = NULL; 1724 static char ntop_buf[INET6_ADDRSTRLEN]; 1725 u_char *a, *p; 1726 int ispassive; 1727 off_t b, otbi, otbo, otb; 1728 1729 a = p = (u_char *)NULL; 1730 1731 lreply(211, "%s FTP server status:", hostname); 1732 lreply(0, "%s", version); 1733 ntop_buf[0] = '\0'; 1734 if (!getnameinfo((struct sockaddr *)&his_addr, his_addr.su_len, 1735 ntop_buf, sizeof(ntop_buf), NULL, 0, NI_NUMERICHOST) 1736 && strcmp(remotehost, ntop_buf) != 0) { 1737 lreply(0, "Connected to %s (%s)", remotehost, ntop_buf); 1738 } else 1739 lreply(0, "Connected to %s", remotehost); 1740 if (logged_in) { 1741 if (curclass.type == CLASS_GUEST) 1742 lreply(0, "Logged in anonymously"); 1743 else 1744 lreply(0, "Logged in as %s%s", pw->pw_name, 1745 curclass.type == CLASS_CHROOT ? " (chroot)" : ""); 1746 } else if (askpasswd) 1747 lreply(0, "Waiting for password"); 1748 else 1749 lreply(0, "Waiting for user name"); 1750 b = printf(" TYPE: %s", typenames[type]); 1751 total_bytes += b; 1752 total_bytes_out += b; 1753 if (type == TYPE_A || type == TYPE_E) { 1754 b = printf(", FORM: %s", formnames[form]); 1755 total_bytes += b; 1756 total_bytes_out += b; 1757 } 1758 if (type == TYPE_L) { 1759 #if NBBY == 8 1760 b = printf(" %d", NBBY); 1761 #else 1762 /* XXX: `bytesize' needs to be defined in this case */ 1763 b = printf(" %d", bytesize); 1764 #endif 1765 total_bytes += b; 1766 total_bytes_out += b; 1767 } 1768 b = printf("; STRUcture: %s; transfer MODE: %s\r\n", 1769 strunames[stru], modenames[mode]); 1770 total_bytes += b; 1771 total_bytes_out += b; 1772 ispassive = 0; 1773 if (data != -1) { 1774 lreply(0, "Data connection open"); 1775 su = NULL; 1776 } else if (pdata != -1) { 1777 b = printf(" in Passive mode"); 1778 total_bytes += b; 1779 total_bytes_out += b; 1780 su = (union sockunion *)&pasv_addr; 1781 ispassive = 1; 1782 goto printaddr; 1783 } else if (usedefault == 0) { 1784 if (epsvall) { 1785 b = printf("211- EPSV only mode (EPSV ALL )\r\n"); 1786 total_bytes += b; 1787 total_bytes_out += b; 1788 goto epsvonly; 1789 } 1790 b = printf("211- %s", 1791 (data_dest.su_family == AF_INET) ? "PORT" : "LPRT"); 1792 total_bytes += b; 1793 total_bytes_out += b; 1794 su = (union sockunion *)&data_dest; 1795 printaddr: 1796 /* PASV/PORT */ 1797 if (su->su_family == AF_INET) { 1798 if (ispassive) 1799 b = printf("211- PASV "); 1800 else 1801 b = printf("211- PORT "); 1802 a = (u_char *) &su->su_sin.sin_addr; 1803 p = (u_char *) &su->su_sin.sin_port; 1804 #define UC(b) (((int) b) & 0xff) 1805 b += printf("(%d,%d,%d,%d,%d,%d)\r\n", 1806 UC(a[0]), UC(a[1]), UC(a[2]), UC(a[3]), 1807 UC(p[0]), UC(p[1])); 1808 total_bytes += b; 1809 total_bytes_out += b; 1810 } 1811 1812 /* LPSV/LPRT */ 1813 { 1814 int alen, af, i; 1815 1816 alen = 0; 1817 switch (su->su_family) { 1818 case AF_INET: 1819 a = (u_char *) &su->su_sin.sin_addr; 1820 p = (u_char *) &su->su_sin.sin_port; 1821 alen = sizeof(su->su_sin.sin_addr); 1822 af = 4; 1823 break; 1824 case AF_INET6: 1825 a = (u_char *) &su->su_sin6.sin6_addr; 1826 p = (u_char *) &su->su_sin6.sin6_port; 1827 alen = sizeof(su->su_sin6.sin6_addr); 1828 af = 6; 1829 break; 1830 default: 1831 af = 0; 1832 break; 1833 } 1834 if (af) { 1835 if (ispassive) 1836 b = printf("211- LPSV "); 1837 else 1838 b = printf("211- LPRT "); 1839 printf("(%d,%d", af, alen); 1840 for (i = 0; i < alen; i++) 1841 b += printf("%d,", UC(a[alen])); 1842 b += printf("%d,%d,%d)\r\n", 2, UC(p[0]), UC(p[1])); 1843 total_bytes += b; 1844 total_bytes_out += b; 1845 #undef UC 1846 } 1847 } 1848 1849 /* EPRT/EPSV */ 1850 epsvonly:; 1851 { 1852 int af; 1853 1854 switch (su->su_family) { 1855 case AF_INET: 1856 af = 1; 1857 break; 1858 case AF_INET6: 1859 af = 2; 1860 break; 1861 default: 1862 af = 0; 1863 break; 1864 } 1865 if (af) { 1866 if (getnameinfo((struct sockaddr *)su, su->su_len, 1867 ntop_buf, sizeof(ntop_buf), NULL, 0, 1868 NI_NUMERICHOST) == 0) { 1869 if (ispassive) 1870 b = printf("211 - EPSV "); 1871 else 1872 b = printf("211 - EPRT "); 1873 b += printf("(|%d|%s|%d|)\r\n", 1874 af, ntop_buf, ntohs(su->su_port)); 1875 total_bytes += b; 1876 total_bytes_out += b; 1877 } 1878 } 1879 } 1880 } else 1881 lreply(0, "No data connection"); 1882 1883 if (logged_in) { 1884 lreply(0, "Data sent: %qd byte%s in %qd file%s", 1885 (qdfmt_t)total_data_out, PLURAL(total_data_out), 1886 (qdfmt_t)total_files_out, PLURAL(total_files_out)); 1887 lreply(0, "Data received: %qd byte%s in %qd file%s", 1888 (qdfmt_t)total_data_in, PLURAL(total_data_in), 1889 (qdfmt_t)total_files_in, PLURAL(total_files_in)); 1890 lreply(0, "Total data: %qd byte%s in %qd file%s", 1891 (qdfmt_t)total_data, PLURAL(total_data), 1892 (qdfmt_t)total_files, PLURAL(total_files)); 1893 } 1894 otbi = total_bytes_in; 1895 otbo = total_bytes_out; 1896 otb = total_bytes; 1897 lreply(0, "Traffic sent: %qd byte%s in %qd transfer%s", 1898 (qdfmt_t)otbo, PLURAL(otbo), 1899 (qdfmt_t)total_xfers_out, PLURAL(total_xfers_out)); 1900 lreply(0, "Traffic received: %qd byte%s in %qd transfer%s", 1901 (qdfmt_t)otbi, PLURAL(otbi), 1902 (qdfmt_t)total_xfers_in, PLURAL(total_xfers_in)); 1903 lreply(0, "Total traffic: %qd byte%s in %qd transfer%s", 1904 (qdfmt_t)otb, PLURAL(otb), 1905 (qdfmt_t)total_xfers, PLURAL(total_xfers)); 1906 1907 if (logged_in) { 1908 struct ftpconv *cp; 1909 1910 lreply(0, ""); 1911 lreply(0, "Class: %s, type: %s", 1912 curclass.classname, CURCLASSTYPE); 1913 lreply(0, "Check PORT/LPRT commands: %sabled", 1914 curclass.checkportcmd ? "en" : "dis"); 1915 if (curclass.display != NULL) 1916 lreply(0, "Display file: %s", curclass.display); 1917 if (curclass.notify != NULL) 1918 lreply(0, "Notify fileglob: %s", curclass.notify); 1919 lreply(0, "Idle timeout: %d, maximum timeout: %d", 1920 curclass.timeout, curclass.maxtimeout); 1921 lreply(0, "Current connections: %d", connections); 1922 if (curclass.limit == -1) 1923 lreply(0, "Maximum connections: unlimited"); 1924 else 1925 lreply(0, "Maximum connections: %d", curclass.limit); 1926 if (curclass.limitfile) 1927 lreply(0, "Connection limit exceeded file: %s", 1928 curclass.limitfile); 1929 if (curclass.motd != NULL) 1930 lreply(0, "MotD file: %s", curclass.motd); 1931 lreply(0, 1932 "Modify commands (CHMOD, DELE, MKD, RMD, RNFR, UMASK): %sabled", 1933 curclass.modify ? "en" : "dis"); 1934 lreply(0, 1935 "Upload commands (APPE, STOR, STOU): %sabled", 1936 curclass.upload ? "en" : "dis"); 1937 if (curclass.rateget) 1938 lreply(0, "Rate get limit: %d bytes/sec", 1939 curclass.rateget); 1940 else 1941 lreply(0, "Rate get limit: disabled"); 1942 if (curclass.rateput) 1943 lreply(0, "Rate put limit: %d bytes/sec", 1944 curclass.rateput); 1945 else 1946 lreply(0, "Rate put limit: disabled"); 1947 lreply(0, "Umask: %.04o", curclass.umask); 1948 for (cp = curclass.conversions; cp != NULL; cp=cp->next) { 1949 if (cp->suffix == NULL || cp->types == NULL || 1950 cp->command == NULL) 1951 continue; 1952 lreply(0, 1953 "Conversion: %s [%s] disable: %s, command: %s", 1954 cp->suffix, cp->types, cp->disable, cp->command); 1955 } 1956 } 1957 1958 reply(211, "End of status"); 1959 } 1960 1961 void 1962 fatal(s) 1963 const char *s; 1964 { 1965 1966 reply(451, "Error in server: %s\n", s); 1967 reply(221, "Closing connection due to server error."); 1968 dologout(0); 1969 /* NOTREACHED */ 1970 } 1971 1972 void 1973 #ifdef __STDC__ 1974 reply(int n, const char *fmt, ...) 1975 #else 1976 reply(n, fmt, va_alist) 1977 int n; 1978 char *fmt; 1979 va_dcl 1980 #endif 1981 { 1982 off_t b; 1983 va_list ap; 1984 #ifdef __STDC__ 1985 va_start(ap, fmt); 1986 #else 1987 va_start(ap); 1988 #endif 1989 b = 0; 1990 b += printf("%d ", n); 1991 b += vprintf(fmt, ap); 1992 b += printf("\r\n"); 1993 total_bytes += b; 1994 total_bytes_out += b; 1995 (void)fflush(stdout); 1996 if (debug) { 1997 syslog(LOG_DEBUG, "<--- %d ", n); 1998 vsyslog(LOG_DEBUG, fmt, ap); 1999 } 2000 } 2001 2002 void 2003 #ifdef __STDC__ 2004 lreply(int n, const char *fmt, ...) 2005 #else 2006 lreply(n, fmt, va_alist) 2007 int n; 2008 char *fmt; 2009 va_dcl 2010 #endif 2011 { 2012 off_t b; 2013 va_list ap; 2014 #ifdef __STDC__ 2015 va_start(ap, fmt); 2016 #else 2017 va_start(ap); 2018 #endif 2019 b = 0; 2020 switch (n) { 2021 case 0: 2022 b += printf(" "); 2023 case -1: 2024 break; 2025 default: 2026 b += printf("%d-", n); 2027 break; 2028 } 2029 b += vprintf(fmt, ap); 2030 b += printf("\r\n"); 2031 total_bytes += b; 2032 total_bytes_out += b; 2033 (void)fflush(stdout); 2034 if (debug) { 2035 syslog(LOG_DEBUG, "<--- %d- ", n); 2036 vsyslog(LOG_DEBUG, fmt, ap); 2037 } 2038 } 2039 2040 static void 2041 ack(s) 2042 const char *s; 2043 { 2044 2045 reply(250, "%s command successful.", s); 2046 } 2047 2048 void 2049 delete(name) 2050 const char *name; 2051 { 2052 char *p = NULL; 2053 2054 if (remove(name) < 0) { 2055 p = strerror(errno); 2056 perror_reply(550, name); 2057 } else 2058 ack("DELE"); 2059 logcmd("delete", -1, name, NULL, NULL, p); 2060 } 2061 2062 void 2063 cwd(path) 2064 const char *path; 2065 { 2066 2067 if (chdir(path) < 0) 2068 perror_reply(550, path); 2069 else { 2070 show_chdir_messages(250); 2071 ack("CWD"); 2072 } 2073 } 2074 2075 static void 2076 replydirname(name, message) 2077 const char *name, *message; 2078 { 2079 char npath[MAXPATHLEN]; 2080 int i; 2081 2082 for (i = 0; *name != '\0' && i < sizeof(npath) - 1; i++, name++) { 2083 npath[i] = *name; 2084 if (*name == '"') 2085 npath[++i] = '"'; 2086 } 2087 npath[i] = '\0'; 2088 reply(257, "\"%s\" %s", npath, message); 2089 } 2090 2091 void 2092 makedir(name) 2093 const char *name; 2094 { 2095 char *p = NULL; 2096 2097 if (mkdir(name, 0777) < 0) { 2098 p = strerror(errno); 2099 perror_reply(550, name); 2100 } else 2101 replydirname(name, "directory created."); 2102 logcmd("mkdir", -1, name, NULL, NULL, p); 2103 } 2104 2105 void 2106 removedir(name) 2107 const char *name; 2108 { 2109 char *p = NULL; 2110 2111 if (rmdir(name) < 0) { 2112 p = strerror(errno); 2113 perror_reply(550, name); 2114 } else 2115 ack("RMD"); 2116 logcmd("rmdir", -1, name, NULL, NULL, p); 2117 } 2118 2119 void 2120 pwd() 2121 { 2122 char path[MAXPATHLEN]; 2123 2124 if (getcwd(path, sizeof(path) - 1) == NULL) 2125 reply(550, "Can't get the current directory: %s.", 2126 strerror(errno)); 2127 else 2128 replydirname(path, "is the current directory."); 2129 } 2130 2131 char * 2132 renamefrom(name) 2133 char *name; 2134 { 2135 struct stat st; 2136 2137 if (stat(name, &st) < 0) { 2138 perror_reply(550, name); 2139 return (NULL); 2140 } 2141 reply(350, "File exists, ready for destination name"); 2142 return (xstrdup(name)); 2143 } 2144 2145 void 2146 renamecmd(from, to) 2147 const char *from, *to; 2148 { 2149 char *p = NULL; 2150 2151 if (rename(from, to) < 0) { 2152 p = strerror(errno); 2153 perror_reply(550, "rename"); 2154 } else 2155 ack("RNTO"); 2156 logcmd("rename", -1, from, to, NULL, p); 2157 } 2158 2159 static void 2160 dolog(who) 2161 struct sockaddr *who; 2162 { 2163 getnameinfo(who, who->sa_len, remotehost, sizeof(remotehost), NULL,0,0); 2164 #ifdef HASSETPROCTITLE 2165 snprintf(proctitle, sizeof(proctitle), "%s: connected", remotehost); 2166 setproctitle(proctitle); 2167 #endif /* HASSETPROCTITLE */ 2168 if (logging) 2169 syslog(LOG_INFO, "connection from %s to %s", 2170 remotehost, hostname); 2171 } 2172 2173 /* 2174 * Record logout in wtmp file 2175 * and exit with supplied status. 2176 */ 2177 void 2178 dologout(status) 2179 int status; 2180 { 2181 /* 2182 * Prevent reception of SIGURG from resulting in a resumption 2183 * back to the main program loop. 2184 */ 2185 transflag = 0; 2186 2187 if (logged_in) { 2188 (void) seteuid((uid_t)0); 2189 logwtmp(ttyline, "", ""); 2190 if (doutmp) 2191 logout(utmp.ut_line); 2192 #ifdef KERBEROS 2193 if (!notickets && krbtkfile_env) 2194 unlink(krbtkfile_env); 2195 #endif 2196 } 2197 /* beware of flushing buffers after a SIGPIPE */ 2198 _exit(status); 2199 } 2200 2201 static void 2202 myoob(signo) 2203 int signo; 2204 { 2205 char *cp; 2206 2207 /* only process if transfer occurring */ 2208 if (!transflag) 2209 return; 2210 cp = tmpline; 2211 if (getline(cp, 7, stdin) == NULL) { 2212 reply(221, "You could at least say goodbye."); 2213 dologout(0); 2214 } 2215 if (strcasecmp(cp, "ABOR\r\n") == 0) { 2216 tmpline[0] = '\0'; 2217 reply(426, "Transfer aborted. Data connection closed."); 2218 reply(226, "Abort successful"); 2219 longjmp(urgcatch, 1); 2220 } 2221 if (strcasecmp(cp, "STAT\r\n") == 0) { 2222 tmpline[0] = '\0'; 2223 if (file_size != (off_t) -1) 2224 reply(213, "Status: %qd of %qd byte%s transferred", 2225 (qdfmt_t)byte_count, (qdfmt_t)file_size, 2226 PLURAL(byte_count)); 2227 else 2228 reply(213, "Status: %qd byte%s transferred", 2229 (qdfmt_t)byte_count, PLURAL(byte_count)); 2230 } 2231 } 2232 2233 static int 2234 bind_pasv_addr() 2235 { 2236 static int passiveport; 2237 int port, len; 2238 2239 len = pasv_addr.su_len; 2240 if (curclass.portmin == 0 && curclass.portmax == 0) { 2241 pasv_addr.su_port = 0; 2242 return (bind(pdata, (struct sockaddr *)&pasv_addr, len)); 2243 } 2244 2245 if (passiveport == 0) { 2246 srand(getpid()); 2247 passiveport = rand() % (curclass.portmax - curclass.portmin) 2248 + curclass.portmin; 2249 } 2250 2251 port = passiveport; 2252 while (1) { 2253 port++; 2254 if (port > curclass.portmax) 2255 port = curclass.portmin; 2256 else if (port == passiveport) { 2257 errno = EAGAIN; 2258 return (-1); 2259 } 2260 pasv_addr.su_port = htons(port); 2261 if (bind(pdata, (struct sockaddr *)&pasv_addr, len) == 0) 2262 break; 2263 if (errno != EADDRINUSE) 2264 return (-1); 2265 } 2266 passiveport = port; 2267 return (0); 2268 } 2269 2270 /* 2271 * Note: a response of 425 is not mentioned as a possible response to 2272 * the PASV command in RFC959. However, it has been blessed as 2273 * a legitimate response by Jon Postel in a telephone conversation 2274 * with Rick Adams on 25 Jan 89. 2275 */ 2276 void 2277 passive() 2278 { 2279 int len; 2280 char *p, *a; 2281 2282 if (pdata >= 0) 2283 close(pdata); 2284 pdata = socket(AF_INET, SOCK_STREAM, 0); 2285 if (pdata < 0 || !logged_in) { 2286 perror_reply(425, "Can't open passive connection"); 2287 return; 2288 } 2289 pasv_addr = ctrl_addr; 2290 2291 if (bind_pasv_addr() < 0) 2292 goto pasv_error; 2293 len = pasv_addr.su_len; 2294 if (getsockname(pdata, (struct sockaddr *) &pasv_addr, &len) < 0) 2295 goto pasv_error; 2296 if (listen(pdata, 1) < 0) 2297 goto pasv_error; 2298 a = (char *) &pasv_addr.su_sin.sin_addr; 2299 p = (char *) &pasv_addr.su_port; 2300 2301 #define UC(b) (((int) b) & 0xff) 2302 2303 reply(227, "Entering Passive Mode (%d,%d,%d,%d,%d,%d)", UC(a[0]), 2304 UC(a[1]), UC(a[2]), UC(a[3]), UC(p[0]), UC(p[1])); 2305 return; 2306 2307 pasv_error: 2308 (void) close(pdata); 2309 pdata = -1; 2310 perror_reply(425, "Can't open passive connection"); 2311 return; 2312 } 2313 2314 /* 2315 * 228 Entering Long Passive Mode (af, hal, h1, h2, h3,..., pal, p1, p2...) 2316 * 229 Entering Extended Passive Mode (|||port|) 2317 */ 2318 void 2319 long_passive(char *cmd, int pf) 2320 { 2321 int len; 2322 char *p, *a; 2323 2324 if (!logged_in) { 2325 syslog(LOG_NOTICE, "long passive but not logged in"); 2326 reply(503, "Login with USER first."); 2327 return; 2328 } 2329 2330 if (pf != PF_UNSPEC) { 2331 if (ctrl_addr.su_family != pf) { 2332 switch (ctrl_addr.su_family) { 2333 case AF_INET: 2334 pf = 1; 2335 break; 2336 case AF_INET6: 2337 pf = 2; 2338 break; 2339 default: 2340 pf = 0; 2341 break; 2342 } 2343 /* 2344 * XXX 2345 * only EPRT/EPSV ready clients will understand this 2346 */ 2347 if (strcmp(cmd, "EPSV") == 0 && pf) { 2348 reply(522, "Network protocol mismatch, " 2349 "use (%d)", pf); 2350 } else 2351 reply(501, "Network protocol mismatch"); /*XXX*/ 2352 2353 return; 2354 } 2355 } 2356 2357 if (pdata >= 0) 2358 close(pdata); 2359 pdata = socket(ctrl_addr.su_family, SOCK_STREAM, 0); 2360 if (pdata < 0) { 2361 perror_reply(425, "Can't open passive connection"); 2362 return; 2363 } 2364 pasv_addr = ctrl_addr; 2365 if (bind_pasv_addr() < 0) 2366 goto pasv_error; 2367 len = pasv_addr.su_len; 2368 if (getsockname(pdata, (struct sockaddr *) &pasv_addr, &len) < 0) 2369 goto pasv_error; 2370 if (listen(pdata, 1) < 0) 2371 goto pasv_error; 2372 p = (char *) &pasv_addr.su_port; 2373 2374 #define UC(b) (((int) b) & 0xff) 2375 2376 if (strcmp(cmd, "LPSV") == 0) { 2377 switch (pasv_addr.su_family) { 2378 case AF_INET: 2379 a = (char *) &pasv_addr.su_sin.sin_addr; 2380 reply(228, "Entering Long Passive Mode (%d,%d,%d,%d,%d,%d,%d,%d,%d)", 2381 4, 4, UC(a[0]), UC(a[1]), UC(a[2]), UC(a[3]), 2382 2, UC(p[0]), UC(p[1])); 2383 return; 2384 case AF_INET6: 2385 a = (char *) &pasv_addr.su_sin6.sin6_addr; 2386 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)", 2387 6, 16, 2388 UC(a[0]), UC(a[1]), UC(a[2]), UC(a[3]), 2389 UC(a[4]), UC(a[5]), UC(a[6]), UC(a[7]), 2390 UC(a[8]), UC(a[9]), UC(a[10]), UC(a[11]), 2391 UC(a[12]), UC(a[13]), UC(a[14]), UC(a[15]), 2392 2, UC(p[0]), UC(p[1])); 2393 return; 2394 } 2395 #undef UC 2396 } else if (strcmp(cmd, "EPSV") == 0) { 2397 switch (pasv_addr.su_family) { 2398 case AF_INET: 2399 case AF_INET6: 2400 reply(229, "Entering Extended Passive Mode (|||%d|)", 2401 ntohs(pasv_addr.su_port)); 2402 return; 2403 } 2404 } else { 2405 /* more proper error code? */ 2406 } 2407 2408 pasv_error: 2409 (void) close(pdata); 2410 pdata = -1; 2411 perror_reply(425, "Can't open passive connection"); 2412 return; 2413 } 2414 2415 /* 2416 * Generate unique name for file with basename "local". 2417 * The file named "local" is already known to exist. 2418 * Generates failure reply on error. 2419 * 2420 * XXX this function should under go changes similar to 2421 * the mktemp(3)/mkstemp(3) changes. 2422 */ 2423 static char * 2424 gunique(local) 2425 const char *local; 2426 { 2427 static char new[MAXPATHLEN]; 2428 struct stat st; 2429 char *cp; 2430 int count; 2431 2432 cp = strrchr(local, '/'); 2433 if (cp) 2434 *cp = '\0'; 2435 if (stat(cp ? local : ".", &st) < 0) { 2436 perror_reply(553, cp ? local : "."); 2437 return (NULL); 2438 } 2439 if (cp) 2440 *cp = '/'; 2441 for (count = 1; count < 100; count++) { 2442 (void)snprintf(new, sizeof(new) - 1, "%s.%d", local, count); 2443 if (stat(new, &st) < 0) 2444 return (new); 2445 } 2446 reply(452, "Unique file name cannot be created."); 2447 return (NULL); 2448 } 2449 2450 /* 2451 * Format and send reply containing system error number. 2452 */ 2453 void 2454 perror_reply(code, string) 2455 int code; 2456 const char *string; 2457 { 2458 int save_errno; 2459 2460 save_errno = errno; 2461 reply(code, "%s: %s.", string, strerror(errno)); 2462 errno = save_errno; 2463 } 2464 2465 static char *onefile[] = { 2466 "", 2467 0 2468 }; 2469 2470 void 2471 send_file_list(whichf) 2472 const char *whichf; 2473 { 2474 struct stat st; 2475 DIR *dirp = NULL; 2476 struct dirent *dir; 2477 FILE *dout = NULL; 2478 char **dirlist, *dirname, *p; 2479 int simple = 0; 2480 int freeglob = 0; 2481 glob_t gl; 2482 off_t b; 2483 2484 #ifdef __GNUC__ 2485 (void) &dout; 2486 (void) &dirlist; 2487 (void) &simple; 2488 (void) &freeglob; 2489 #endif 2490 2491 p = NULL; 2492 if (strpbrk(whichf, "~{[*?") != NULL) { 2493 int flags = GLOB_BRACE|GLOB_NOCHECK|GLOB_TILDE; 2494 2495 memset(&gl, 0, sizeof(gl)); 2496 freeglob = 1; 2497 if (glob(whichf, flags, 0, &gl)) { 2498 reply(550, "not found"); 2499 goto out; 2500 } else if (gl.gl_pathc == 0) { 2501 errno = ENOENT; 2502 perror_reply(550, whichf); 2503 goto out; 2504 } 2505 dirlist = gl.gl_pathv; 2506 } else { 2507 p = xstrdup(whichf); 2508 onefile[0] = p; 2509 dirlist = onefile; 2510 simple = 1; 2511 } 2512 /* XXX: } for vi sm */ 2513 2514 if (setjmp(urgcatch)) { 2515 transflag = 0; 2516 goto out; 2517 } 2518 while ((dirname = *dirlist++) != NULL) { 2519 int trailingslash = 0; 2520 2521 if (stat(dirname, &st) < 0) { 2522 /* 2523 * If user typed "ls -l", etc, and the client 2524 * used NLST, do what the user meant. 2525 */ 2526 /* XXX: nuke this support? */ 2527 if (dirname[0] == '-' && *dirlist == NULL && 2528 transflag == 0) { 2529 char *argv[] = { INTERNAL_LS, "", NULL }; 2530 2531 argv[1] = dirname; 2532 retrieve(argv, dirname); 2533 goto out; 2534 } 2535 perror_reply(550, whichf); 2536 if (dout != NULL) { 2537 (void) fclose(dout); 2538 transflag = 0; 2539 data = -1; 2540 pdata = -1; 2541 } 2542 goto out; 2543 } 2544 2545 if (S_ISREG(st.st_mode)) { 2546 if (dout == NULL) { 2547 dout = dataconn("file list", (off_t)-1, "w"); 2548 if (dout == NULL) 2549 goto out; 2550 transflag++; 2551 } 2552 b = fprintf(dout, "%s%s\n", dirname, 2553 type == TYPE_A ? "\r" : ""); 2554 total_bytes += b; 2555 total_bytes_out += b; 2556 byte_count += strlen(dirname) + 1; 2557 continue; 2558 } else if (!S_ISDIR(st.st_mode)) 2559 continue; 2560 2561 if (dirname[strlen(dirname) - 1] == '/') 2562 trailingslash++; 2563 2564 if ((dirp = opendir(dirname)) == NULL) 2565 continue; 2566 2567 while ((dir = readdir(dirp)) != NULL) { 2568 char nbuf[MAXPATHLEN]; 2569 2570 if (dir->d_name[0] == '.' && dir->d_namlen == 1) 2571 continue; 2572 if (dir->d_name[0] == '.' && dir->d_name[1] == '.' && 2573 dir->d_namlen == 2) 2574 continue; 2575 2576 (void)snprintf(nbuf, sizeof(nbuf), "%s%s%s", dirname, 2577 trailingslash ? "" : "/", dir->d_name); 2578 2579 /* 2580 * We have to do a stat to ensure it's 2581 * not a directory or special file. 2582 */ 2583 /* XXX: follow RFC959 and filter out non files ? */ 2584 if (simple || (stat(nbuf, &st) == 0 && 2585 S_ISREG(st.st_mode))) { 2586 char *p; 2587 2588 if (dout == NULL) { 2589 dout = dataconn("file list", (off_t)-1, 2590 "w"); 2591 if (dout == NULL) 2592 goto out; 2593 transflag++; 2594 } 2595 p = nbuf; 2596 if (nbuf[0] == '.' && nbuf[1] == '/') 2597 p = &nbuf[2]; 2598 b = fprintf(dout, "%s%s\n", p, 2599 type == TYPE_A ? "\r" : ""); 2600 total_bytes += b; 2601 total_bytes_out += b; 2602 byte_count += strlen(nbuf) + 1; 2603 } 2604 } 2605 (void) closedir(dirp); 2606 } 2607 2608 if (dout == NULL) 2609 reply(550, "No files found."); 2610 else if (ferror(dout) != 0) 2611 perror_reply(550, "Data connection"); 2612 else 2613 reply(226, "Transfer complete."); 2614 2615 transflag = 0; 2616 if (dout != NULL) 2617 (void) fclose(dout); 2618 data = -1; 2619 pdata = -1; 2620 out: 2621 total_xfers++; 2622 total_xfers_out++; 2623 if (p) 2624 free(p); 2625 if (freeglob) 2626 globfree(&gl); 2627 } 2628 2629 char * 2630 conffilename(s) 2631 const char *s; 2632 { 2633 static char filename[MAXPATHLEN]; 2634 2635 if (*s == '/') 2636 strlcpy(filename, s, sizeof(filename)); 2637 else 2638 (void)snprintf(filename, sizeof(filename), "%s/%s", confdir ,s); 2639 return (filename); 2640 } 2641 2642 /* 2643 * logcmd -- 2644 * based on the arguments, syslog a message: 2645 * if bytes != -1 "<command> <file1> = <bytes> bytes" 2646 * else if file2 != NULL "<command> <file1> <file2>" 2647 * else "<command> <file1>" 2648 * if elapsed != NULL, append "in xxx.yyy seconds" 2649 * if error != NULL, append ": " + error 2650 */ 2651 2652 void 2653 logcmd(command, bytes, file1, file2, elapsed, error) 2654 const char *command; 2655 off_t bytes; 2656 const char *file1; 2657 const char *file2; 2658 const struct timeval *elapsed; 2659 const char *error; 2660 { 2661 char buf[MAXPATHLEN * 2 + 100], realfile[MAXPATHLEN]; 2662 const char *p; 2663 size_t len; 2664 2665 if (logging <=1) 2666 return; 2667 2668 if ((p = realpath(file1, realfile)) == NULL) { 2669 #if 0 /* XXX: too noisy */ 2670 syslog(LOG_WARNING, "realpath `%s' failed: %s", 2671 realfile, strerror(errno)); 2672 #endif 2673 p = file1; 2674 } 2675 len = snprintf(buf, sizeof(buf), "%s %s", command, p); 2676 2677 if (bytes != (off_t)-1) { 2678 len += snprintf(buf + len, sizeof(buf) - len, 2679 " = %qd byte%s", (qdfmt_t) bytes, PLURAL(bytes)); 2680 } else if (file2 != NULL) { 2681 if ((p = realpath(file2, realfile)) == NULL) { 2682 #if 0 /* XXX: too noisy */ 2683 syslog(LOG_WARNING, "realpath `%s' failed: %s", 2684 realfile, strerror(errno)); 2685 #endif 2686 p = file2; 2687 } 2688 len += snprintf(buf + len, sizeof(buf) - len, " %s", p); 2689 } 2690 2691 if (elapsed != NULL) { 2692 len += snprintf(buf + len, sizeof(buf) - len, 2693 " in %ld.%.03d seconds", elapsed->tv_sec, 2694 (int)(elapsed->tv_usec / 1000)); 2695 } 2696 2697 if (error != NULL) 2698 len += snprintf(buf + len, sizeof(buf) - len, ": %s", error); 2699 2700 syslog(LOG_INFO, "%s", buf); 2701 } 2702 2703 char * 2704 xstrdup(s) 2705 const char *s; 2706 { 2707 char *new = strdup(s); 2708 2709 if (new == NULL) 2710 fatal("Local resource failure: malloc"); 2711 /* NOTREACHED */ 2712 return (new); 2713 } 2714
Indexes created Tue Oct 14 08:09:56 GMT 2025