ftpd.c revision 1.81
1 /* $NetBSD: ftpd.c,v 1.81 1999/12/21 12:56:15 lukem Exp $ */ 2 3 /* 4 * Copyright (c) 1997-1999 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 1.81 1999/12/21 12:56:15 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 #include "extern.h" 164 #include "pathnames.h" 165 #include "version.h" 166 167 #if __STDC__ 168 #include <stdarg.h> 169 #else 170 #include <varargs.h> 171 #endif 172 173 const char version[] = FTPD_VERSION; 174 175 union sockunion ctrl_addr; 176 union sockunion data_source; 177 union sockunion data_dest; 178 union sockunion his_addr; 179 union sockunion pasv_addr; 180 181 int data; 182 jmp_buf errcatch, urgcatch; 183 int logged_in; 184 struct passwd *pw; 185 int debug; 186 int sflag; 187 int logging; 188 int type; 189 int form; 190 int stru; /* avoid C keyword */ 191 int mode; 192 int doutmp = 0; /* update utmp file */ 193 int usedefault = 1; /* for data transfers */ 194 int pdata = -1; /* for passive mode */ 195 int mapped = 0; /* IPv4 connection on AF_INET6 socket */ 196 sig_atomic_t transflag; 197 off_t file_size; 198 off_t byte_count; 199 char tmpline[7]; 200 char hostname[MAXHOSTNAMELEN+1]; 201 char remotehost[MAXHOSTNAMELEN+1]; 202 static char ttyline[20]; 203 char *tty = ttyline; /* for klogin */ 204 static struct utmp utmp; /* for utmp */ 205 206 off_t total_data_in; /* total file data bytes received */ 207 off_t total_data_out; /* total file data bytes sent data */ 208 off_t total_data; /* total file data bytes transferred data */ 209 off_t total_files_in; /* total number of data files received */ 210 off_t total_files_out; /* total number of data files sent */ 211 off_t total_files; /* total number of data files transferred */ 212 off_t total_bytes_in; /* total bytes received */ 213 off_t total_bytes_out; /* total bytes sent */ 214 off_t total_bytes; /* total bytes transferred */ 215 off_t total_xfers_in; /* total number of xfers incoming */ 216 off_t total_xfers_out; /* total number of xfers outgoing */ 217 off_t total_xfers; /* total number of xfers */ 218 219 static char *anondir = NULL; 220 static char confdir[MAXPATHLEN]; 221 222 #if defined(KERBEROS) || defined(KERBEROS5) 223 int notickets = 1; 224 char *krbtkfile_env = NULL; 225 #endif 226 227 int epsvall = 0; 228 229 /* 230 * Timeout intervals for retrying connections 231 * to hosts that don't accept PORT cmds. This 232 * is a kludge, but given the problems with TCP... 233 */ 234 #define SWAITMAX 90 /* wait at most 90 seconds */ 235 #define SWAITINT 5 /* interval between retries */ 236 237 int swaitmax = SWAITMAX; 238 int swaitint = SWAITINT; 239 240 #ifdef HASSETPROCTITLE 241 char proctitle[BUFSIZ]; /* initial part of title */ 242 #endif /* HASSETPROCTITLE */ 243 244 #define CURCLASSTYPE curclass.type == CLASS_GUEST ? "GUEST" : \ 245 curclass.type == CLASS_CHROOT ? "CHROOT" : \ 246 curclass.type == CLASS_REAL ? "REAL" : \ 247 "<unknown>" 248 249 static void ack __P((const char *)); 250 static void myoob __P((int)); 251 static int checkuser __P((const char *, const char *, int, int, char **)); 252 static int checkaccess __P((const char *)); 253 static FILE *dataconn __P((const char *, off_t, const char *)); 254 static void dolog __P((struct sockaddr *)); 255 static void end_login __P((void)); 256 static FILE *getdatasock __P((const char *)); 257 static char *gunique __P((const char *)); 258 static void lostconn __P((int)); 259 static int receive_data __P((FILE *, FILE *)); 260 static void replydirname __P((const char *, const char *)); 261 static int send_data __P((FILE *, FILE *, off_t, int)); 262 static struct passwd * 263 sgetpwnam __P((const char *)); 264 265 int main __P((int, char *[])); 266 267 #if defined(KERBEROS) || defined(KERBEROS5) 268 int klogin __P((struct passwd *, char *, char *, char *)); 269 void kdestroy __P((void)); 270 #endif 271 272 int 273 main(argc, argv) 274 int argc; 275 char *argv[]; 276 { 277 int addrlen, ch, on = 1, tos, keepalive; 278 #ifdef KERBEROS5 279 krb5_error_code kerror; 280 #endif 281 282 debug = 0; 283 logging = 0; 284 sflag = 0; 285 (void)strcpy(confdir, _DEFAULT_CONFDIR); 286 hostname[0] = '\0'; 287 288 while ((ch = getopt(argc, argv, "a:c:C:dh:lst:T:u:Uv")) != -1) { 289 switch (ch) { 290 case 'a': 291 anondir = optarg; 292 break; 293 294 case 'c': 295 (void)strlcpy(confdir, optarg, sizeof(confdir)); 296 break; 297 298 case 'C': 299 pw = sgetpwnam(optarg); 300 exit(checkaccess(optarg) ? 0 : 1); 301 /* NOTREACHED */ 302 303 case 'd': 304 case 'v': /* deprecated */ 305 debug = 1; 306 break; 307 308 case 'h': 309 strlcpy(hostname, optarg, sizeof(hostname)); 310 break; 311 312 case 'l': 313 logging++; /* > 1 == extra logging */ 314 break; 315 316 case 's': 317 sflag = 1; 318 break; 319 320 case 't': 321 case 'T': 322 case 'u': 323 warnx("-%c has been deprecated in favour of ftpd.conf", 324 ch); 325 break; 326 327 case 'U': 328 doutmp = 1; 329 break; 330 331 default: 332 if (optopt == 'a' || optopt == 'C') 333 exit(1); 334 warnx("unknown flag -%c ignored", optopt); 335 break; 336 } 337 } 338 339 /* 340 * LOG_NDELAY sets up the logging connection immediately, 341 * necessary for anonymous ftp's that chroot and can't do it later. 342 */ 343 openlog("ftpd", LOG_PID | LOG_NDELAY, LOG_FTP); 344 addrlen = sizeof(his_addr); /* xxx */ 345 if (getpeername(0, (struct sockaddr *)&his_addr, &addrlen) < 0) { 346 syslog(LOG_ERR, "getpeername (%s): %m",argv[0]); 347 exit(1); 348 } 349 addrlen = sizeof(ctrl_addr); 350 if (getsockname(0, (struct sockaddr *)&ctrl_addr, &addrlen) < 0) { 351 syslog(LOG_ERR, "getsockname (%s): %m",argv[0]); 352 exit(1); 353 } 354 if (his_addr.su_family == AF_INET6 355 && IN6_IS_ADDR_V4MAPPED(&his_addr.su_sin6.sin6_addr)) { 356 #if 1 357 /* 358 * IPv4 control connection arrived to AF_INET6 socket. 359 * I hate to do this, but this is the easiest solution. 360 */ 361 union sockunion tmp_addr; 362 const int off = sizeof(struct in6_addr) - sizeof(struct in_addr); 363 364 tmp_addr = his_addr; 365 memset(&his_addr, 0, sizeof(his_addr)); 366 his_addr.su_sin.sin_family = AF_INET; 367 his_addr.su_sin.sin_len = sizeof(his_addr.su_sin); 368 memcpy(&his_addr.su_sin.sin_addr, 369 &tmp_addr.su_sin6.sin6_addr.s6_addr[off], 370 sizeof(his_addr.su_sin.sin_addr)); 371 his_addr.su_sin.sin_port = tmp_addr.su_sin6.sin6_port; 372 373 tmp_addr = ctrl_addr; 374 memset(&ctrl_addr, 0, sizeof(ctrl_addr)); 375 ctrl_addr.su_sin.sin_family = AF_INET; 376 ctrl_addr.su_sin.sin_len = sizeof(ctrl_addr.su_sin); 377 memcpy(&ctrl_addr.su_sin.sin_addr, 378 &tmp_addr.su_sin6.sin6_addr.s6_addr[off], 379 sizeof(ctrl_addr.su_sin.sin_addr)); 380 ctrl_addr.su_sin.sin_port = tmp_addr.su_sin6.sin6_port; 381 #else 382 while (fgets(line, sizeof(line), fd) != NULL) { 383 if ((cp = strchr(line, '\n')) != NULL) 384 *cp = '\0'; 385 lreply(530, "%s", line); 386 } 387 (void) fflush(stdout); 388 (void) fclose(fd); 389 reply(530, 390 "Connection from IPv4 mapped address is not supported."); 391 exit(0); 392 #endif 393 394 mapped = 1; 395 } else 396 mapped = 0; 397 #ifdef IP_TOS 398 if (!mapped && his_addr.su_family == AF_INET) { 399 tos = IPTOS_LOWDELAY; 400 if (setsockopt(0, IPPROTO_IP, IP_TOS, (char *)&tos, 401 sizeof(int)) < 0) 402 syslog(LOG_WARNING, "setsockopt (IP_TOS): %m"); 403 } 404 #endif 405 data_source.su_port = htons(ntohs(ctrl_addr.su_port) - 1); 406 407 /* if the hostname hasn't been given, attempt to determine it */ 408 if (hostname[0] == '\0') { 409 if (getnameinfo((struct sockaddr *)&ctrl_addr, ctrl_addr.su_len, 410 hostname, sizeof(hostname), NULL, 0, 0) != 0) 411 (void)gethostname(hostname, sizeof(hostname)); 412 hostname[sizeof(hostname) - 1] = '\0'; 413 } 414 415 /* set this here so klogin can use it... */ 416 (void)snprintf(ttyline, sizeof(ttyline), "ftp%d", getpid()); 417 418 (void) freopen(_PATH_DEVNULL, "w", stderr); 419 (void) signal(SIGPIPE, lostconn); 420 (void) signal(SIGCHLD, SIG_IGN); 421 if (signal(SIGURG, myoob) == SIG_ERR) 422 syslog(LOG_ERR, "signal: %m"); 423 424 /* Try to handle urgent data inline */ 425 #ifdef SO_OOBINLINE 426 if (setsockopt(0, SOL_SOCKET, SO_OOBINLINE, (char *)&on, sizeof(on)) < 0) 427 syslog(LOG_ERR, "setsockopt: %m"); 428 #endif 429 /* Set keepalives on the socket to detect dropped connections. */ 430 #ifdef SO_KEEPALIVE 431 keepalive = 1; 432 if (setsockopt(0, SOL_SOCKET, SO_KEEPALIVE, (char *)&keepalive, 433 sizeof(int)) < 0) 434 syslog(LOG_WARNING, "setsockopt (SO_KEEPALIVE): %m"); 435 #endif 436 437 #ifdef F_SETOWN 438 if (fcntl(fileno(stdin), F_SETOWN, getpid()) == -1) 439 syslog(LOG_ERR, "fcntl F_SETOWN: %m"); 440 #endif 441 dolog((struct sockaddr *)&his_addr); 442 /* 443 * Set up default state 444 */ 445 data = -1; 446 type = TYPE_A; 447 form = FORM_N; 448 stru = STRU_F; 449 mode = MODE_S; 450 tmpline[0] = '\0'; 451 hasyyerrored = 0; 452 453 #ifdef KERBEROS5 454 kerror = krb5_init_context(&kcontext); 455 if (kerror) { 456 syslog(LOG_NOTICE, "%s when initializing Kerberos context", 457 error_message(kerror)); 458 exit(0); 459 } 460 #endif /* KERBEROS5 */ 461 462 /* If logins are disabled, print out the message. */ 463 if (format_file(_PATH_NOLOGIN, 530)) { 464 reply(530, "System not available."); 465 exit(0); 466 } 467 (void)format_file(conffilename(_PATH_FTPWELCOME), 220); 468 /* reply(220,) must follow */ 469 reply(220, "%s FTP server (%s) ready.", hostname, version); 470 471 curclass.timeout = 300; /* 5 minutes, as per login(1) */ 472 curclass.type = CLASS_REAL; 473 474 (void) setjmp(errcatch); 475 for (;;) 476 (void) yyparse(); 477 /* NOTREACHED */ 478 } 479 480 static void 481 lostconn(signo) 482 int signo; 483 { 484 485 if (debug) 486 syslog(LOG_DEBUG, "lost connection"); 487 dologout(1); 488 } 489 490 /* 491 * Save the result of a getpwnam. Used for USER command, since 492 * the data returned must not be clobbered by any other command 493 * (e.g., globbing). 494 */ 495 static struct passwd * 496 sgetpwnam(name) 497 const char *name; 498 { 499 static struct passwd save; 500 struct passwd *p; 501 502 if ((p = getpwnam(name)) == NULL) 503 return (p); 504 if (save.pw_name) { 505 free((char *)save.pw_name); 506 memset(save.pw_passwd, 0, strlen(save.pw_passwd)); 507 free((char *)save.pw_passwd); 508 free((char *)save.pw_gecos); 509 free((char *)save.pw_dir); 510 free((char *)save.pw_shell); 511 } 512 save = *p; 513 save.pw_name = xstrdup(p->pw_name); 514 save.pw_passwd = xstrdup(p->pw_passwd); 515 save.pw_gecos = xstrdup(p->pw_gecos); 516 save.pw_dir = xstrdup(p->pw_dir); 517 save.pw_shell = xstrdup(p->pw_shell); 518 return (&save); 519 } 520 521 static int login_attempts; /* number of failed login attempts */ 522 static int askpasswd; /* had user command, ask for passwd */ 523 static char curname[10]; /* current USER name */ 524 525 /* 526 * USER command. 527 * Sets global passwd pointer pw if named account exists and is acceptable; 528 * sets askpasswd if a PASS command is expected. If logged in previously, 529 * need to reset state. If name is "ftp" or "anonymous", the name is not in 530 * _PATH_FTPUSERS, and ftp account exists, set guest and pw, then just return. 531 * If account doesn't exist, ask for passwd anyway. Otherwise, check user 532 * requesting login privileges. Disallow anyone who does not have a standard 533 * shell as returned by getusershell(). Disallow anyone mentioned in the file 534 * _PATH_FTPUSERS to allow people such as root and uucp to be avoided. 535 */ 536 void 537 user(name) 538 const char *name; 539 { 540 if (logged_in) { 541 switch (curclass.type) { 542 case CLASS_GUEST: 543 reply(530, "Can't change user from guest login."); 544 return; 545 case CLASS_CHROOT: 546 reply(530, "Can't change user from chroot user."); 547 return; 548 case CLASS_REAL: 549 end_login(); 550 break; 551 default: 552 abort(); 553 } 554 } 555 556 #if defined(KERBEROS) || defined(KERBEROS5) 557 kdestroy(); 558 #endif 559 560 curclass.type = CLASS_REAL; 561 if (strcmp(name, "ftp") == 0 || strcmp(name, "anonymous") == 0) { 562 /* need `pw' setup for checkaccess() and checkuser () */ 563 if ((pw = sgetpwnam("ftp")) == NULL) 564 reply(530, "User %s unknown.", name); 565 else if (! checkaccess("ftp") && ! checkaccess("anonymous")) 566 reply(530, "User %s access denied.", name); 567 else { 568 curclass.type = CLASS_GUEST; 569 askpasswd = 1; 570 reply(331, 571 "Guest login ok, type your name as password."); 572 } 573 if (!askpasswd && logging) 574 syslog(LOG_NOTICE, 575 "ANONYMOUS FTP LOGIN REFUSED FROM %s", remotehost); 576 return; 577 } 578 579 pw = sgetpwnam(name); 580 if (logging) 581 strlcpy(curname, name, sizeof(curname)); 582 583 #ifdef SKEY 584 if (skey_haskey(name) == 0) { 585 char *myskey; 586 587 myskey = skey_keyinfo(name); 588 reply(331, "Password [%s] required for %s.", 589 myskey ? myskey : "error getting challenge", name); 590 } else 591 #endif 592 reply(331, "Password required for %s.", name); 593 594 askpasswd = 1; 595 /* 596 * Delay before reading passwd after first failed 597 * attempt to slow down passwd-guessing programs. 598 */ 599 if (login_attempts) 600 sleep((unsigned) login_attempts); 601 } 602 603 /* 604 * Determine whether something is to happen (allow access, chroot) 605 * for a user. Each line is a shell-style glob followed by 606 * `yes' or `no'. 607 * 608 * For backward compatability, `allow' and `deny' are synonymns 609 * for `yes' and `no', respectively. 610 * 611 * Each glob is matched against the username in turn, and the first 612 * match found is used. If no match is found, the result is the 613 * argument `def'. If a match is found but without and explicit 614 * `yes'/`no', the result is the opposite of def. 615 * 616 * If the file doesn't exist at all, the result is the argument 617 * `nofile' 618 * 619 * Any line starting with `#' is considered a comment and ignored. 620 * 621 * Returns 0 if the user is denied, or 1 if they are allowed. 622 * 623 * NOTE: needs struct passwd *pw setup before use. 624 */ 625 int 626 checkuser(fname, name, def, nofile, retclass) 627 const char *fname, *name; 628 int def, nofile; 629 char **retclass; 630 { 631 FILE *fd; 632 int retval; 633 char *glob, *perm, *class, *buf, *p; 634 size_t len, line; 635 636 retval = def; 637 if (retclass != NULL) 638 *retclass = NULL; 639 if ((fd = fopen(conffilename(fname), "r")) == NULL) 640 return nofile; 641 642 line = 0; 643 for (; 644 (buf = fparseln(fd, &len, &line, NULL, FPARSELN_UNESCCOMM | 645 FPARSELN_UNESCCONT | FPARSELN_UNESCESC)) != NULL; 646 free(buf), buf = NULL) { 647 glob = perm = class = NULL; 648 p = buf; 649 if (len < 1) 650 continue; 651 if (p[len - 1] == '\n') 652 p[--len] = '\0'; 653 if (EMPTYSTR(p)) 654 continue; 655 656 NEXTWORD(p, glob); 657 NEXTWORD(p, perm); 658 NEXTWORD(p, class); 659 if (EMPTYSTR(glob)) 660 continue; 661 if (!EMPTYSTR(class)) { 662 if (strcasecmp(class, "all") == 0 || 663 strcasecmp(class, "none") == 0) { 664 syslog(LOG_WARNING, 665 "%s line %d: illegal user-defined class `%s' - skipping entry", 666 fname, (int)line, class); 667 continue; 668 } 669 } 670 671 /* have a host specifier */ 672 if ((p = strchr(glob, '@')) != NULL) { 673 u_int32_t net, mask, addr; 674 int bits; 675 676 *p++ = '\0'; 677 /* check against network or CIDR */ 678 if (isdigit(*p) && 679 (bits = inet_net_pton(AF_INET, p, 680 &net, sizeof(net))) != -1) { 681 net = ntohl(net); 682 mask = 0xffffffffU << (32 - bits); 683 addr = ntohl(his_addr.su_sin.sin_addr.s_addr); 684 if ((addr & mask) != net) 685 continue; 686 687 /* check against hostname glob */ 688 } else if (fnmatch(p, remotehost, 0) != 0) 689 continue; 690 } 691 692 /* have a group specifier */ 693 if ((p = strchr(glob, ':')) != NULL) { 694 gid_t *groups, *ng; 695 int gsize, i, found; 696 697 *p++ = '\0'; 698 groups = NULL; 699 gsize = 16; 700 do { 701 ng = realloc(groups, gsize * sizeof(gid_t)); 702 if (ng == NULL) 703 fatal( 704 "Local resource failure: realloc"); 705 groups = ng; 706 } while (getgrouplist(pw->pw_name, pw->pw_gid, 707 groups, &gsize) == -1); 708 found = 0; 709 for (i = 0; i < gsize; i++) { 710 struct group *g; 711 712 if ((g = getgrgid(groups[i])) == NULL) 713 continue; 714 if (fnmatch(p, g->gr_name, 0) == 0) { 715 found = 1; 716 break; 717 } 718 } 719 free(groups); 720 if (!found) 721 continue; 722 } 723 724 /* check against username glob */ 725 if (fnmatch(glob, name, 0) != 0) 726 continue; 727 728 if (perm != NULL && 729 ((strcasecmp(perm, "allow") == 0) || 730 (strcasecmp(perm, "yes") == 0))) 731 retval = 1; 732 else if (perm != NULL && 733 ((strcasecmp(perm, "deny") == 0) || 734 (strcasecmp(perm, "no") == 0))) 735 retval = 0; 736 else 737 retval = !def; 738 if (!EMPTYSTR(class) && retclass != NULL) 739 *retclass = xstrdup(class); 740 free(buf); 741 break; 742 } 743 (void) fclose(fd); 744 return (retval); 745 } 746 747 /* 748 * Check if user is allowed by /etc/ftpusers 749 * returns 1 for yes, 0 for no 750 * 751 * NOTE: needs struct passwd *pw setup (for checkuser()) 752 */ 753 int 754 checkaccess(name) 755 const char *name; 756 { 757 758 return (checkuser(_PATH_FTPUSERS, name, 1, 0, NULL)); 759 } 760 761 /* 762 * Terminate login as previous user, if any, resetting state; 763 * used when USER command is given or login fails. 764 */ 765 static void 766 end_login() 767 { 768 769 (void) seteuid((uid_t)0); 770 if (logged_in) { 771 logwtmp(ttyline, "", ""); 772 if (doutmp) 773 logout(utmp.ut_line); 774 } 775 pw = NULL; 776 logged_in = 0; 777 curclass.type = CLASS_REAL; 778 } 779 780 void 781 pass(passwd) 782 const char *passwd; 783 { 784 int rval; 785 const char *cp, *shell, *home; 786 char *class; 787 788 class = NULL; 789 if (logged_in || askpasswd == 0) { 790 reply(503, "Login with USER first."); 791 return; 792 } 793 askpasswd = 0; 794 if (curclass.type != CLASS_GUEST) { 795 /* "ftp" is only account allowed no password */ 796 if (pw == NULL) { 797 rval = 1; /* failure below */ 798 goto skip; 799 } 800 #if defined(KERBEROS) || defined(KERBEROS5) 801 if (klogin(pw, "", hostname, (char *)passwd) == 0) { 802 rval = 0; 803 goto skip; 804 } 805 #endif 806 #ifdef SKEY 807 if (skey_haskey(pw->pw_name) == 0) { 808 char *p; 809 int r; 810 811 p = xstrdup(passwd); 812 r = skey_passcheck(pw->pw_name, p); 813 free(p); 814 if (r != -1) { 815 rval = 0; 816 goto skip; 817 } 818 } 819 #endif 820 if (!sflag && *pw->pw_passwd != '\0' && 821 !strcmp(crypt(passwd, pw->pw_passwd), pw->pw_passwd)) { 822 rval = 0; 823 goto skip; 824 } 825 rval = 1; 826 827 skip: 828 if (pw != NULL && pw->pw_expire && time(NULL) >= pw->pw_expire) 829 rval = 2; 830 /* 831 * If rval > 0, the user failed the authentication check 832 * above. If rval == 0, either Kerberos or local authentication 833 * succeeded. 834 */ 835 if (rval) { 836 reply(530, rval == 2 ? "Password expired." : 837 "Login incorrect."); 838 if (logging) { 839 syslog(LOG_NOTICE, 840 "FTP LOGIN FAILED FROM %s", remotehost); 841 syslog(LOG_AUTHPRIV | LOG_NOTICE, 842 "FTP LOGIN FAILED FROM %s, %s", 843 remotehost, curname); 844 } 845 pw = NULL; 846 if (login_attempts++ >= 5) { 847 syslog(LOG_NOTICE, 848 "repeated login failures from %s", 849 remotehost); 850 exit(0); 851 } 852 return; 853 } 854 } 855 856 /* password was ok; see if anything else prevents login */ 857 if (! checkuser(_PATH_FTPUSERS, pw->pw_name, 1, 0, &class)) { 858 reply(530, "User %s may not use FTP.", pw->pw_name); 859 if (logging) 860 syslog(LOG_NOTICE, "FTP LOGIN REFUSED FROM %s, %s", 861 remotehost, pw->pw_name); 862 pw = (struct passwd *) NULL; 863 goto cleanuppass; 864 } 865 /* check for valid shell, if not guest user */ 866 if ((shell = pw->pw_shell) == NULL || *shell == 0) 867 shell = _PATH_BSHELL; 868 while ((cp = getusershell()) != NULL) 869 if (strcmp(cp, shell) == 0) 870 break; 871 endusershell(); 872 if (cp == NULL && curclass.type != CLASS_GUEST) { 873 reply(530, "User %s may not use FTP.", pw->pw_name); 874 if (logging) 875 syslog(LOG_NOTICE, "FTP LOGIN REFUSED FROM %s, %s", 876 remotehost, pw->pw_name); 877 pw = (struct passwd *) NULL; 878 goto cleanuppass; 879 } 880 881 login_attempts = 0; /* this time successful */ 882 if (setegid((gid_t)pw->pw_gid) < 0) { 883 reply(550, "Can't set gid."); 884 goto cleanuppass; 885 } 886 (void) initgroups(pw->pw_name, pw->pw_gid); 887 888 /* open wtmp before chroot */ 889 logwtmp(ttyline, pw->pw_name, remotehost); 890 891 /* open utmp before chroot */ 892 if (doutmp) { 893 memset((void *)&utmp, 0, sizeof(utmp)); 894 (void)time(&utmp.ut_time); 895 (void)strncpy(utmp.ut_name, pw->pw_name, sizeof(utmp.ut_name)); 896 (void)strncpy(utmp.ut_host, remotehost, sizeof(utmp.ut_host)); 897 (void)strncpy(utmp.ut_line, ttyline, sizeof(utmp.ut_line)); 898 login(&utmp); 899 } 900 901 logged_in = 1; 902 903 /* check user in /etc/ftpchroot */ 904 if (checkuser(_PATH_FTPCHROOT, pw->pw_name, 0, 0, NULL)) { 905 if (curclass.type == CLASS_GUEST) { 906 syslog(LOG_NOTICE, 907 "Can't change guest user to chroot class; remove entry in %s", 908 _PATH_FTPCHROOT); 909 exit(1); 910 } 911 curclass.type = CLASS_CHROOT; 912 } 913 if (class == NULL) { 914 switch (curclass.type) { 915 case CLASS_GUEST: 916 class = xstrdup("guest"); 917 break; 918 case CLASS_CHROOT: 919 class = xstrdup("chroot"); 920 break; 921 case CLASS_REAL: 922 class = xstrdup("real"); 923 break; 924 default: 925 abort(); 926 } 927 } 928 929 /* parse ftpd.conf, setting up various parameters */ 930 parse_conf(class); 931 932 home = "/"; 933 switch (curclass.type) { 934 case CLASS_GUEST: 935 /* 936 * We MUST do a chdir() after the chroot. Otherwise 937 * the old current directory will be accessible as "." 938 * outside the new root! 939 */ 940 if (chroot(anondir ? anondir : pw->pw_dir) < 0 || 941 chdir("/") < 0) { 942 reply(550, "Can't set guest privileges."); 943 goto bad; 944 } 945 break; 946 case CLASS_CHROOT: 947 if (chroot(pw->pw_dir) < 0 || chdir("/") < 0) { 948 reply(550, "Can't change root."); 949 goto bad; 950 } 951 break; 952 case CLASS_REAL: 953 if (chdir(pw->pw_dir) < 0) { 954 if (chdir("/") < 0) { 955 reply(530, 956 "User %s: can't change directory to %s.", 957 pw->pw_name, pw->pw_dir); 958 goto bad; 959 } else 960 lreply(230, 961 "No directory! Logging in with home=/"); 962 } else 963 home = pw->pw_dir; 964 break; 965 } 966 if (seteuid((uid_t)pw->pw_uid) < 0) { 967 reply(550, "Can't set uid."); 968 goto bad; 969 } 970 setenv("HOME", home, 1); 971 972 /* 973 * Display a login message, if it exists. 974 * N.B. reply(230,) must follow the message. 975 */ 976 (void)format_file(conffilename(curclass.motd), 230); 977 show_chdir_messages(230); 978 if (curclass.type == CLASS_GUEST) { 979 reply(230, "Guest login ok, access restrictions apply."); 980 #ifdef HASSETPROCTITLE 981 snprintf(proctitle, sizeof(proctitle), 982 "%s: anonymous/%.*s", remotehost, 983 (int) (sizeof(proctitle) - sizeof(remotehost) - 984 sizeof(": anonymous/")), passwd); 985 setproctitle(proctitle); 986 #endif /* HASSETPROCTITLE */ 987 if (logging) 988 syslog(LOG_INFO, 989 "ANONYMOUS FTP LOGIN FROM %s, %s (class: %s, type: %s)", 990 remotehost, passwd, 991 curclass.classname, CURCLASSTYPE); 992 } else { 993 reply(230, "User %s logged in.", pw->pw_name); 994 #ifdef HASSETPROCTITLE 995 snprintf(proctitle, sizeof(proctitle), 996 "%s: %s", remotehost, pw->pw_name); 997 setproctitle(proctitle); 998 #endif /* HASSETPROCTITLE */ 999 if (logging) 1000 syslog(LOG_INFO, 1001 "FTP LOGIN FROM %s as %s (class: %s, type: %s)", 1002 remotehost, pw->pw_name, 1003 curclass.classname, CURCLASSTYPE); 1004 } 1005 (void) umask(curclass.umask); 1006 goto cleanuppass; 1007 bad: 1008 /* Forget all about it... */ 1009 end_login(); 1010 cleanuppass: 1011 if (class) 1012 free(class); 1013 } 1014 1015 void 1016 retrieve(argv, name) 1017 char *argv[]; 1018 const char *name; 1019 { 1020 FILE *fin = NULL, *dout; 1021 struct stat st; 1022 int (*closefunc) __P((FILE *)) = NULL; 1023 int log, sendrv, closerv, stderrfd, isconversion, isdata, isls; 1024 struct timeval start, finish, td, *tdp; 1025 const char *dispname; 1026 1027 sendrv = closerv = stderrfd = -1; 1028 isconversion = isdata = isls = log = 0; 1029 tdp = NULL; 1030 dispname = name; 1031 if (argv == NULL) { 1032 log = 1; 1033 isdata = 1; 1034 fin = fopen(name, "r"); 1035 closefunc = fclose; 1036 if (fin == NULL) 1037 argv = do_conversion(name); 1038 if (argv != NULL) { 1039 isconversion++; 1040 syslog(LOG_INFO, "get command: '%s' on '%s'", 1041 argv[0], name); 1042 } 1043 } 1044 if (argv != NULL) { 1045 char temp[MAXPATHLEN + 1]; 1046 1047 if (strcmp(argv[0], INTERNAL_LS) == 0) { 1048 isls = 1; 1049 stderrfd = -1; 1050 } else { 1051 (void)snprintf(temp, sizeof(temp), "%s", TMPFILE); 1052 stderrfd = mkstemp(temp); 1053 if (stderrfd != -1) 1054 (void)unlink(temp); 1055 } 1056 dispname = argv[0]; 1057 fin = ftpd_popen(argv, "r", stderrfd); 1058 closefunc = ftpd_pclose; 1059 st.st_size = -1; 1060 st.st_blksize = BUFSIZ; 1061 } 1062 if (fin == NULL) { 1063 if (errno != 0) { 1064 perror_reply(550, dispname); 1065 if (log) 1066 logcmd("get", -1, name, NULL, NULL, 1067 strerror(errno)); 1068 } 1069 goto cleanupretrieve; 1070 } 1071 byte_count = -1; 1072 if (argv == NULL 1073 && (fstat(fileno(fin), &st) < 0 || !S_ISREG(st.st_mode))) { 1074 reply(550, "%s: not a plain file.", dispname); 1075 goto done; 1076 } 1077 if (restart_point) { 1078 if (type == TYPE_A) { 1079 off_t i; 1080 int c; 1081 1082 for (i = 0; i < restart_point; i++) { 1083 if ((c=getc(fin)) == EOF) { 1084 perror_reply(550, dispname); 1085 goto done; 1086 } 1087 if (c == '\n') 1088 i++; 1089 } 1090 } else if (lseek(fileno(fin), restart_point, SEEK_SET) < 0) { 1091 perror_reply(550, dispname); 1092 goto done; 1093 } 1094 } 1095 dout = dataconn(dispname, st.st_size, "w"); 1096 if (dout == NULL) 1097 goto done; 1098 1099 (void)gettimeofday(&start, NULL); 1100 sendrv = send_data(fin, dout, st.st_blksize, isdata); 1101 (void)gettimeofday(&finish, NULL); 1102 (void) fclose(dout); 1103 timersub(&finish, &start, &td); 1104 tdp = &td; 1105 data = -1; 1106 pdata = -1; 1107 done: 1108 if (log) 1109 logcmd("get", byte_count, name, NULL, tdp, NULL); 1110 closerv = (*closefunc)(fin); 1111 if (sendrv == 0) { 1112 FILE *err; 1113 struct stat sb; 1114 1115 if (!isls && argv != NULL && closerv != 0) { 1116 lreply(226, 1117 "Command returned an exit status of %d", 1118 closerv); 1119 if (isconversion) 1120 syslog(LOG_INFO, 1121 "retrieve command: '%s' returned %d", 1122 argv[0], closerv); 1123 } 1124 if (!isls && argv != NULL && stderrfd != -1 && 1125 (fstat(stderrfd, &sb) == 0) && sb.st_size > 0 && 1126 ((err = fdopen(stderrfd, "r")) != NULL)) { 1127 char *cp, line[LINE_MAX]; 1128 1129 lreply(226, "Command error messages:"); 1130 rewind(err); 1131 while (fgets(line, sizeof(line), err) != NULL) { 1132 if ((cp = strchr(line, '\n')) != NULL) 1133 *cp = '\0'; 1134 lreply(0, " %s", line); 1135 } 1136 (void) fflush(stdout); 1137 (void) fclose(err); 1138 /* a reply(226,) must follow */ 1139 } 1140 reply(226, "Transfer complete."); 1141 } 1142 cleanupretrieve: 1143 if (stderrfd != -1) 1144 (void)close(stderrfd); 1145 if (isconversion) 1146 free(argv); 1147 } 1148 1149 void 1150 store(name, mode, unique) 1151 const char *name, *mode; 1152 int unique; 1153 { 1154 FILE *fout, *din; 1155 struct stat st; 1156 int (*closefunc) __P((FILE *)); 1157 struct timeval start, finish, td, *tdp; 1158 char *desc; 1159 1160 desc = (*mode == 'w') ? "put" : "append"; 1161 if (unique && stat(name, &st) == 0 && 1162 (name = gunique(name)) == NULL) { 1163 logcmd(desc, -1, name, NULL, NULL, "cannot create unique file"); 1164 return; 1165 } 1166 1167 if (restart_point) 1168 mode = "r+"; 1169 fout = fopen(name, mode); 1170 closefunc = fclose; 1171 tdp = NULL; 1172 if (fout == NULL) { 1173 perror_reply(553, name); 1174 logcmd(desc, -1, name, NULL, NULL, strerror(errno)); 1175 return; 1176 } 1177 byte_count = -1; 1178 if (restart_point) { 1179 if (type == TYPE_A) { 1180 off_t i; 1181 int c; 1182 1183 for (i = 0; i < restart_point; i++) { 1184 if ((c=getc(fout)) == EOF) { 1185 perror_reply(550, name); 1186 goto done; 1187 } 1188 if (c == '\n') 1189 i++; 1190 } 1191 /* 1192 * We must do this seek to "current" position 1193 * because we are changing from reading to 1194 * writing. 1195 */ 1196 if (fseek(fout, 0L, SEEK_CUR) < 0) { 1197 perror_reply(550, name); 1198 goto done; 1199 } 1200 } else if (lseek(fileno(fout), restart_point, SEEK_SET) < 0) { 1201 perror_reply(550, name); 1202 goto done; 1203 } 1204 } 1205 din = dataconn(name, (off_t)-1, "r"); 1206 if (din == NULL) 1207 goto done; 1208 (void)gettimeofday(&start, NULL); 1209 if (receive_data(din, fout) == 0) { 1210 if (unique) 1211 reply(226, "Transfer complete (unique file name:%s).", 1212 name); 1213 else 1214 reply(226, "Transfer complete."); 1215 } 1216 (void)gettimeofday(&finish, NULL); 1217 (void) fclose(din); 1218 timersub(&finish, &start, &td); 1219 tdp = &td; 1220 data = -1; 1221 pdata = -1; 1222 done: 1223 logcmd(desc, byte_count, name, NULL, tdp, NULL); 1224 (*closefunc)(fout); 1225 } 1226 1227 static FILE * 1228 getdatasock(mode) 1229 const char *mode; 1230 { 1231 int on = 1, s, t, tries; 1232 1233 if (data >= 0) 1234 return (fdopen(data, mode)); 1235 (void) seteuid((uid_t)0); 1236 s = socket(ctrl_addr.su_family, SOCK_STREAM, 0); 1237 if (s < 0) 1238 goto bad; 1239 if (setsockopt(s, SOL_SOCKET, SO_REUSEADDR, 1240 (char *) &on, sizeof(on)) < 0) 1241 goto bad; 1242 if (setsockopt(s, SOL_SOCKET, SO_KEEPALIVE, 1243 (char *) &on, sizeof(on)) < 0) 1244 goto bad; 1245 /* anchor socket to avoid multi-homing problems */ 1246 data_source = ctrl_addr; 1247 data_source.su_port = htons(20); /* ftp-data port */ 1248 for (tries = 1; ; tries++) { 1249 if (bind(s, (struct sockaddr *)&data_source, 1250 data_source.su_len) >= 0) 1251 break; 1252 if (errno != EADDRINUSE || tries > 10) 1253 goto bad; 1254 sleep(tries); 1255 } 1256 (void) seteuid((uid_t)pw->pw_uid); 1257 #ifdef IP_TOS 1258 if (!mapped && ctrl_addr.su_family == AF_INET) { 1259 on = IPTOS_THROUGHPUT; 1260 if (setsockopt(s, IPPROTO_IP, IP_TOS, (char *)&on, 1261 sizeof(int)) < 0) 1262 syslog(LOG_WARNING, "setsockopt (IP_TOS): %m"); 1263 } 1264 #endif 1265 return (fdopen(s, mode)); 1266 bad: 1267 /* Return the real value of errno (close may change it) */ 1268 t = errno; 1269 (void) seteuid((uid_t)pw->pw_uid); 1270 (void) close(s); 1271 errno = t; 1272 return (NULL); 1273 } 1274 1275 static FILE * 1276 dataconn(name, size, mode) 1277 const char *name; 1278 off_t size; 1279 const char *mode; 1280 { 1281 char sizebuf[32]; 1282 FILE *file; 1283 int retry = 0, tos, keepalive; 1284 1285 file_size = size; 1286 byte_count = 0; 1287 if (size != (off_t) -1) 1288 (void)snprintf(sizebuf, sizeof(sizebuf), " (%qd byte%s)", 1289 (qdfmt_t)size, PLURAL(size)); 1290 else 1291 sizebuf[0] = '\0'; 1292 if (pdata >= 0) { 1293 union sockunion from; 1294 int s, fromlen = sizeof(from); 1295 1296 (void) alarm(curclass.timeout); 1297 s = accept(pdata, (struct sockaddr *)&from, &fromlen); 1298 (void) alarm(0); 1299 if (s < 0) { 1300 reply(425, "Can't open data connection."); 1301 (void) close(pdata); 1302 pdata = -1; 1303 return (NULL); 1304 } 1305 (void) close(pdata); 1306 pdata = s; 1307 switch (from.su_family) { 1308 case AF_INET: 1309 #ifdef IP_TOS 1310 if (!mapped) { 1311 tos = IPTOS_THROUGHPUT; 1312 (void) setsockopt(s, IPPROTO_IP, IP_TOS, 1313 (char *)&tos, sizeof(int)); 1314 } 1315 break; 1316 #endif 1317 } 1318 /* Set keepalives on the socket to detect dropped conns. */ 1319 #ifdef SO_KEEPALIVE 1320 keepalive = 1; 1321 (void) setsockopt(s, SOL_SOCKET, SO_KEEPALIVE, 1322 (char *)&keepalive, sizeof(int)); 1323 #endif 1324 reply(150, "Opening %s mode data connection for '%s'%s.", 1325 type == TYPE_A ? "ASCII" : "BINARY", name, sizebuf); 1326 return (fdopen(pdata, mode)); 1327 } 1328 if (data >= 0) { 1329 reply(125, "Using existing data connection for '%s'%s.", 1330 name, sizebuf); 1331 usedefault = 1; 1332 return (fdopen(data, mode)); 1333 } 1334 if (usedefault) 1335 data_dest = his_addr; 1336 usedefault = 1; 1337 file = getdatasock(mode); 1338 if (file == NULL) { 1339 char hbuf[INET6_ADDRSTRLEN]; 1340 char pbuf[10]; 1341 getnameinfo((struct sockaddr *)&data_source, data_source.su_len, 1342 hbuf, sizeof(hbuf), pbuf, sizeof(pbuf), 1343 NI_NUMERICHOST | NI_NUMERICSERV); 1344 reply(425, "Can't create data socket (%s,%s): %s.", 1345 hbuf, pbuf, strerror(errno)); 1346 return (NULL); 1347 } 1348 data = fileno(file); 1349 while (connect(data, (struct sockaddr *)&data_dest, 1350 data_dest.su_len) < 0) { 1351 if (errno == EADDRINUSE && retry < swaitmax) { 1352 sleep((unsigned) swaitint); 1353 retry += swaitint; 1354 continue; 1355 } 1356 perror_reply(425, "Can't build data connection"); 1357 (void) fclose(file); 1358 data = -1; 1359 return (NULL); 1360 } 1361 reply(150, "Opening %s mode data connection for '%s'%s.", 1362 type == TYPE_A ? "ASCII" : "BINARY", name, sizebuf); 1363 return (file); 1364 } 1365 1366 /* 1367 * Tranfer the contents of "instr" to "outstr" peer using the appropriate 1368 * encapsulation of the data subject * to Mode, Structure, and Type. 1369 * 1370 * NB: Form isn't handled. 1371 */ 1372 static int 1373 send_data(instr, outstr, blksize, isdata) 1374 FILE *instr, *outstr; 1375 off_t blksize; 1376 int isdata; 1377 { 1378 int c, filefd, netfd, rval; 1379 char *buf; 1380 1381 transflag = 1; 1382 rval = -1; 1383 buf = NULL; 1384 if (setjmp(urgcatch)) 1385 goto cleanup_send_data; 1386 1387 switch (type) { 1388 1389 case TYPE_A: 1390 /* XXXX: rate limit ascii send (get) */ 1391 (void) alarm(curclass.timeout); 1392 while ((c = getc(instr)) != EOF) { 1393 byte_count++; 1394 if (c == '\n') { 1395 if (ferror(outstr)) 1396 goto data_err; 1397 (void) putc('\r', outstr); 1398 if (isdata) { 1399 total_data_out++; 1400 total_data++; 1401 } 1402 total_bytes_out++; 1403 total_bytes++; 1404 } 1405 (void) putc(c, outstr); 1406 if (isdata) { 1407 total_data_out++; 1408 total_data++; 1409 } 1410 total_bytes_out++; 1411 total_bytes++; 1412 if ((byte_count % 4096) == 0) 1413 (void) alarm(curclass.timeout); 1414 } 1415 (void) alarm(0); 1416 fflush(outstr); 1417 if (ferror(instr)) 1418 goto file_err; 1419 if (ferror(outstr)) 1420 goto data_err; 1421 rval = 0; 1422 goto cleanup_send_data; 1423 1424 case TYPE_I: 1425 case TYPE_L: 1426 if ((buf = malloc((size_t)blksize)) == NULL) { 1427 perror_reply(451, "Local resource failure: malloc"); 1428 goto cleanup_send_data; 1429 } 1430 filefd = fileno(instr); 1431 netfd = fileno(outstr); 1432 (void) alarm(curclass.timeout); 1433 if (curclass.rateget) { 1434 while (1) { 1435 int d; 1436 struct timeval then, now, td; 1437 off_t bufrem; 1438 char *bufp; 1439 1440 (void)gettimeofday(&then, NULL); 1441 errno = c = d = 0; 1442 bufrem = curclass.rateget; 1443 while (bufrem > 0) { 1444 if ((c = read(filefd, buf, 1445 MIN(blksize, bufrem))) <= 0) 1446 goto senddone; 1447 (void) alarm(curclass.timeout); 1448 bufrem -= c; 1449 byte_count += c; 1450 if (isdata) { 1451 total_data_out += c; 1452 total_data += c; 1453 } 1454 total_bytes_out += c; 1455 total_bytes += c; 1456 for (bufp = buf; c > 0; 1457 c -= d, bufp += d) 1458 if ((d = 1459 write(netfd, bufp, c)) <= 0) 1460 break; 1461 if (d < 0) 1462 goto data_err; 1463 } 1464 (void)gettimeofday(&now, NULL); 1465 timersub(&now, &then, &td); 1466 if (td.tv_sec > 0) 1467 break; 1468 usleep(1000000 - td.tv_usec); 1469 } 1470 } else { 1471 while ((c = read(filefd, buf, (size_t)blksize)) > 0) { 1472 if (write(netfd, buf, c) != c) 1473 goto data_err; 1474 (void) alarm(curclass.timeout); 1475 byte_count += c; 1476 if (isdata) { 1477 total_data_out += c; 1478 total_data += c; 1479 } 1480 total_bytes_out += c; 1481 total_bytes += c; 1482 } 1483 } 1484 senddone: 1485 if (c < 0) 1486 goto file_err; 1487 rval = 0; 1488 goto cleanup_send_data; 1489 1490 default: 1491 reply(550, "Unimplemented TYPE %d in send_data", type); 1492 goto cleanup_send_data; 1493 } 1494 1495 data_err: 1496 (void) alarm(0); 1497 perror_reply(426, "Data connection"); 1498 goto cleanup_send_data; 1499 1500 file_err: 1501 (void) alarm(0); 1502 perror_reply(551, "Error on input file"); 1503 /* FALLTHROUGH */ 1504 1505 cleanup_send_data: 1506 (void) alarm(0); 1507 transflag = 0; 1508 if (buf) 1509 free(buf); 1510 if (isdata) { 1511 total_files_out++; 1512 total_files++; 1513 } 1514 total_xfers_out++; 1515 total_xfers++; 1516 return (rval); 1517 } 1518 1519 /* 1520 * Transfer data from peer to "outstr" using the appropriate encapulation of 1521 * the data subject to Mode, Structure, and Type. 1522 * 1523 * N.B.: Form isn't handled. 1524 */ 1525 static int 1526 receive_data(instr, outstr) 1527 FILE *instr, *outstr; 1528 { 1529 int c, bare_lfs, netfd, filefd, rval; 1530 char buf[BUFSIZ]; 1531 #ifdef __GNUC__ 1532 (void) &bare_lfs; 1533 #endif 1534 1535 bare_lfs = 0; 1536 transflag = 1; 1537 rval = -1; 1538 if (setjmp(urgcatch)) 1539 goto cleanup_recv_data; 1540 1541 switch (type) { 1542 1543 case TYPE_I: 1544 case TYPE_L: 1545 netfd = fileno(instr); 1546 filefd = fileno(outstr); 1547 (void) alarm(curclass.timeout); 1548 if (curclass.rateput) { 1549 while (1) { 1550 int d; 1551 struct timeval then, now, td; 1552 off_t bufrem; 1553 1554 (void)gettimeofday(&then, NULL); 1555 errno = c = d = 0; 1556 for (bufrem = curclass.rateput; bufrem > 0; ) { 1557 if ((c = read(netfd, buf, 1558 MIN(sizeof(buf), bufrem))) <= 0) 1559 goto recvdone; 1560 if ((d = write(filefd, buf, c)) != c) 1561 goto recvdone; 1562 (void) alarm(curclass.timeout); 1563 bufrem -= c; 1564 byte_count += c; 1565 total_data_in += c; 1566 total_data += c; 1567 total_bytes_in += c; 1568 total_bytes += c; 1569 } 1570 (void)gettimeofday(&now, NULL); 1571 timersub(&now, &then, &td); 1572 if (td.tv_sec > 0) 1573 break; 1574 usleep(1000000 - td.tv_usec); 1575 } 1576 } else { 1577 while ((c = read(netfd, buf, sizeof(buf))) > 0) { 1578 if (write(filefd, buf, c) != c) 1579 goto file_err; 1580 (void) alarm(curclass.timeout); 1581 byte_count += c; 1582 total_data_in += c; 1583 total_data += c; 1584 total_bytes_in += c; 1585 total_bytes += c; 1586 } 1587 } 1588 recvdone: 1589 if (c < 0) 1590 goto data_err; 1591 rval = 0; 1592 goto cleanup_recv_data; 1593 1594 case TYPE_E: 1595 reply(553, "TYPE E not implemented."); 1596 goto cleanup_recv_data; 1597 1598 case TYPE_A: 1599 (void) alarm(curclass.timeout); 1600 /* XXXX: rate limit ascii receive (put) */ 1601 while ((c = getc(instr)) != EOF) { 1602 byte_count++; 1603 total_data_in++; 1604 total_data++; 1605 total_bytes_in++; 1606 total_bytes++; 1607 if ((byte_count % 4096) == 0) 1608 (void) alarm(curclass.timeout); 1609 if (c == '\n') 1610 bare_lfs++; 1611 while (c == '\r') { 1612 if (ferror(outstr)) 1613 goto data_err; 1614 if ((c = getc(instr)) != '\n') { 1615 byte_count++; 1616 total_data_in++; 1617 total_data++; 1618 total_bytes_in++; 1619 total_bytes++; 1620 if ((byte_count % 4096) == 0) 1621 (void) alarm(curclass.timeout); 1622 (void) putc ('\r', outstr); 1623 if (c == '\0' || c == EOF) 1624 goto contin2; 1625 } 1626 } 1627 (void) putc(c, outstr); 1628 contin2: ; 1629 } 1630 (void) alarm(0); 1631 fflush(outstr); 1632 if (ferror(instr)) 1633 goto data_err; 1634 if (ferror(outstr)) 1635 goto file_err; 1636 if (bare_lfs) { 1637 lreply(226, 1638 "WARNING! %d bare linefeeds received in ASCII mode", 1639 bare_lfs); 1640 lreply(0, "File may not have transferred correctly."); 1641 } 1642 rval = 0; 1643 goto cleanup_recv_data; 1644 1645 default: 1646 reply(550, "Unimplemented TYPE %d in receive_data", type); 1647 goto cleanup_recv_data; 1648 } 1649 1650 data_err: 1651 (void) alarm(0); 1652 perror_reply(426, "Data Connection"); 1653 goto cleanup_recv_data; 1654 1655 file_err: 1656 (void) alarm(0); 1657 perror_reply(452, "Error writing file"); 1658 goto cleanup_recv_data; 1659 1660 cleanup_recv_data: 1661 (void) alarm(0); 1662 transflag = 0; 1663 total_files_in++; 1664 total_files++; 1665 total_xfers_in++; 1666 total_xfers++; 1667 return (rval); 1668 } 1669 1670 void 1671 statfilecmd(filename) 1672 const char *filename; 1673 { 1674 FILE *fin; 1675 int c; 1676 char *argv[] = { INTERNAL_LS, "-lgA", "", NULL }; 1677 1678 argv[2] = (char *)filename; 1679 fin = ftpd_popen(argv, "r", STDOUT_FILENO); 1680 lreply(211, "status of %s:", filename); 1681 while ((c = getc(fin)) != EOF) { 1682 if (c == '\n') { 1683 if (ferror(stdout)){ 1684 perror_reply(421, "control connection"); 1685 (void) ftpd_pclose(fin); 1686 dologout(1); 1687 /* NOTREACHED */ 1688 } 1689 if (ferror(fin)) { 1690 perror_reply(551, filename); 1691 (void) ftpd_pclose(fin); 1692 return; 1693 } 1694 (void) putchar('\r'); 1695 total_bytes++; 1696 total_bytes_out++; 1697 } 1698 (void) putchar(c); 1699 total_bytes++; 1700 total_bytes_out++; 1701 } 1702 (void) ftpd_pclose(fin); 1703 reply(211, "End of Status"); 1704 } 1705 1706 void 1707 statcmd() 1708 { 1709 union sockunion *su = NULL; 1710 static char ntop_buf[INET6_ADDRSTRLEN]; 1711 u_char *a, *p; 1712 int ispassive; 1713 off_t b, otbi, otbo, otb; 1714 1715 a = p = (u_char *)NULL; 1716 1717 lreply(211, "%s FTP server status:", hostname); 1718 lreply(0, "%s", version); 1719 ntop_buf[0] = '\0'; 1720 if (!getnameinfo((struct sockaddr *)&his_addr, his_addr.su_len, 1721 ntop_buf, sizeof(ntop_buf), NULL, 0, NI_NUMERICHOST) 1722 && strcmp(remotehost, ntop_buf) != 0) { 1723 lreply(0, "Connected to %s (%s)", remotehost, ntop_buf); 1724 } else 1725 lreply(0, "Connected to %s", remotehost); 1726 if (logged_in) { 1727 if (curclass.type == CLASS_GUEST) 1728 lreply(0, "Logged in anonymously"); 1729 else 1730 lreply(0, "Logged in as %s%s", pw->pw_name, 1731 curclass.type == CLASS_CHROOT ? " (chroot)" : ""); 1732 } else if (askpasswd) 1733 lreply(0, "Waiting for password"); 1734 else 1735 lreply(0, "Waiting for user name"); 1736 b = printf(" TYPE: %s", typenames[type]); 1737 total_bytes += b; 1738 total_bytes_out += b; 1739 if (type == TYPE_A || type == TYPE_E) { 1740 b = printf(", FORM: %s", formnames[form]); 1741 total_bytes += b; 1742 total_bytes_out += b; 1743 } 1744 if (type == TYPE_L) { 1745 #if NBBY == 8 1746 b = printf(" %d", NBBY); 1747 #else 1748 /* XXX: `bytesize' needs to be defined in this case */ 1749 b = printf(" %d", bytesize); 1750 #endif 1751 total_bytes += b; 1752 total_bytes_out += b; 1753 } 1754 b = printf("; STRUcture: %s; transfer MODE: %s\r\n", 1755 strunames[stru], modenames[mode]); 1756 total_bytes += b; 1757 total_bytes_out += b; 1758 ispassive = 0; 1759 if (data != -1) { 1760 lreply(0, "Data connection open"); 1761 su = NULL; 1762 } else if (pdata != -1) { 1763 b = printf(" in Passive mode"); 1764 total_bytes += b; 1765 total_bytes_out += b; 1766 su = (union sockunion *)&pasv_addr; 1767 ispassive = 1; 1768 goto printaddr; 1769 } else if (usedefault == 0) { 1770 if (epsvall) { 1771 b = printf("211- EPSV only mode (EPSV ALL )\r\n"); 1772 total_bytes += b; 1773 total_bytes_out += b; 1774 goto epsvonly; 1775 } 1776 b = printf("211- %s", 1777 (data_dest.su_family == AF_INET) ? "PORT" : "LPRT"); 1778 total_bytes += b; 1779 total_bytes_out += b; 1780 su = (union sockunion *)&data_dest; 1781 printaddr: 1782 /* PASV/PORT */ 1783 if (su->su_family == AF_INET) { 1784 if (ispassive) 1785 b = printf("211- PASV "); 1786 else 1787 b = printf("211- PORT "); 1788 a = (u_char *) &su->su_sin.sin_addr; 1789 p = (u_char *) &su->su_sin.sin_port; 1790 #define UC(b) (((int) b) & 0xff) 1791 b += printf("(%d,%d,%d,%d,%d,%d)\r\n", 1792 UC(a[0]), UC(a[1]), UC(a[2]), UC(a[3]), 1793 UC(p[0]), UC(p[1])); 1794 total_bytes += b; 1795 total_bytes_out += b; 1796 } 1797 1798 /* LPSV/LPRT */ 1799 { 1800 int alen, af, i; 1801 1802 alen = 0; 1803 switch (su->su_family) { 1804 case AF_INET: 1805 a = (u_char *) &su->su_sin.sin_addr; 1806 p = (u_char *) &su->su_sin.sin_port; 1807 alen = sizeof(su->su_sin.sin_addr); 1808 af = 4; 1809 break; 1810 case AF_INET6: 1811 a = (u_char *) &su->su_sin6.sin6_addr; 1812 p = (u_char *) &su->su_sin6.sin6_port; 1813 alen = sizeof(su->su_sin6.sin6_addr); 1814 af = 6; 1815 break; 1816 default: 1817 af = 0; 1818 break; 1819 } 1820 if (af) { 1821 if (ispassive) 1822 b = printf("211- LPSV "); 1823 else 1824 b = printf("211- LPRT "); 1825 printf("(%d,%d", af, alen); 1826 for (i = 0; i < alen; i++) 1827 b += printf("%d,", UC(a[alen])); 1828 b += printf("%d,%d,%d)\r\n", 2, UC(p[0]), UC(p[1])); 1829 total_bytes += b; 1830 total_bytes_out += b; 1831 #undef UC 1832 } 1833 } 1834 1835 /* EPRT/EPSV */ 1836 epsvonly:; 1837 { 1838 int af; 1839 1840 switch (su->su_family) { 1841 case AF_INET: 1842 af = 1; 1843 break; 1844 case AF_INET6: 1845 af = 2; 1846 break; 1847 default: 1848 af = 0; 1849 break; 1850 } 1851 if (af) { 1852 if (getnameinfo((struct sockaddr *)su, su->su_len, 1853 ntop_buf, sizeof(ntop_buf), NULL, 0, 1854 NI_NUMERICHOST) == 0) { 1855 if (ispassive) 1856 b = printf("211 - EPSV "); 1857 else 1858 b = printf("211 - EPRT "); 1859 b += printf("(|%d|%s|%d|)\r\n", 1860 af, ntop_buf, ntohs(su->su_port)); 1861 total_bytes += b; 1862 total_bytes_out += b; 1863 } 1864 } 1865 } 1866 } else 1867 lreply(0, "No data connection"); 1868 1869 if (logged_in) { 1870 lreply(0, "Data sent: %qd byte%s in %qd file%s", 1871 (qdfmt_t)total_data_out, PLURAL(total_data_out), 1872 (qdfmt_t)total_files_out, PLURAL(total_files_out)); 1873 lreply(0, "Data received: %qd byte%s in %qd file%s", 1874 (qdfmt_t)total_data_in, PLURAL(total_data_in), 1875 (qdfmt_t)total_files_in, PLURAL(total_files_in)); 1876 lreply(0, "Total data: %qd byte%s in %qd file%s", 1877 (qdfmt_t)total_data, PLURAL(total_data), 1878 (qdfmt_t)total_files, PLURAL(total_files)); 1879 } 1880 otbi = total_bytes_in; 1881 otbo = total_bytes_out; 1882 otb = total_bytes; 1883 lreply(0, "Traffic sent: %qd byte%s in %qd transfer%s", 1884 (qdfmt_t)otbo, PLURAL(otbo), 1885 (qdfmt_t)total_xfers_out, PLURAL(total_xfers_out)); 1886 lreply(0, "Traffic received: %qd byte%s in %qd transfer%s", 1887 (qdfmt_t)otbi, PLURAL(otbi), 1888 (qdfmt_t)total_xfers_in, PLURAL(total_xfers_in)); 1889 lreply(0, "Total traffic: %qd byte%s in %qd transfer%s", 1890 (qdfmt_t)otb, PLURAL(otb), 1891 (qdfmt_t)total_xfers, PLURAL(total_xfers)); 1892 1893 if (logged_in) { 1894 struct ftpconv *cp; 1895 1896 lreply(0, ""); 1897 lreply(0, "Class: %s, type: %s", 1898 curclass.classname, CURCLASSTYPE); 1899 lreply(0, "Check PORT/LPRT commands: %sabled", 1900 curclass.checkportcmd ? "en" : "dis"); 1901 if (curclass.display != NULL) 1902 lreply(0, "Display file: %s", curclass.display); 1903 if (curclass.notify != NULL) 1904 lreply(0, "Notify fileglob: %s", curclass.notify); 1905 lreply(0, "Idle timeout: %d, maximum timeout: %d", 1906 curclass.timeout, curclass.maxtimeout); 1907 if (curclass.motd != NULL) 1908 lreply(0, "MotD file: %s", curclass.motd); 1909 lreply(0, 1910 "Modify commands (CHMOD, DELE, MKD, RMD, RNFR, UMASK): %sabled", 1911 curclass.modify ? "en" : "dis"); 1912 lreply(0, 1913 "Upload commands (APPE, STOR, STOU): %sabled", 1914 curclass.upload ? "en" : "dis"); 1915 if (curclass.rateget) 1916 lreply(0, "Rate get limit: %d bytes/sec", 1917 curclass.rateget); 1918 else 1919 lreply(0, "Rate get limit: disabled"); 1920 if (curclass.rateput) 1921 lreply(0, "Rate put limit: %d bytes/sec", 1922 curclass.rateput); 1923 else 1924 lreply(0, "Rate put limit: disabled"); 1925 lreply(0, "Umask: %.04o", curclass.umask); 1926 for (cp = curclass.conversions; cp != NULL; cp=cp->next) { 1927 if (cp->suffix == NULL || cp->types == NULL || 1928 cp->command == NULL) 1929 continue; 1930 lreply(0, 1931 "Conversion: %s [%s] disable: %s, command: %s", 1932 cp->suffix, cp->types, cp->disable, cp->command); 1933 } 1934 } 1935 1936 reply(211, "End of status"); 1937 } 1938 1939 void 1940 fatal(s) 1941 const char *s; 1942 { 1943 1944 reply(451, "Error in server: %s\n", s); 1945 reply(221, "Closing connection due to server error."); 1946 dologout(0); 1947 /* NOTREACHED */ 1948 } 1949 1950 void 1951 #ifdef __STDC__ 1952 reply(int n, const char *fmt, ...) 1953 #else 1954 reply(n, fmt, va_alist) 1955 int n; 1956 char *fmt; 1957 va_dcl 1958 #endif 1959 { 1960 off_t b; 1961 va_list ap; 1962 #ifdef __STDC__ 1963 va_start(ap, fmt); 1964 #else 1965 va_start(ap); 1966 #endif 1967 b = 0; 1968 b += printf("%d ", n); 1969 b += vprintf(fmt, ap); 1970 b += printf("\r\n"); 1971 total_bytes += b; 1972 total_bytes_out += b; 1973 (void)fflush(stdout); 1974 if (debug) { 1975 syslog(LOG_DEBUG, "<--- %d ", n); 1976 vsyslog(LOG_DEBUG, fmt, ap); 1977 } 1978 } 1979 1980 void 1981 #ifdef __STDC__ 1982 lreply(int n, const char *fmt, ...) 1983 #else 1984 lreply(n, fmt, va_alist) 1985 int n; 1986 char *fmt; 1987 va_dcl 1988 #endif 1989 { 1990 off_t b; 1991 va_list ap; 1992 #ifdef __STDC__ 1993 va_start(ap, fmt); 1994 #else 1995 va_start(ap); 1996 #endif 1997 b = 0; 1998 switch (n) { 1999 case 0: 2000 b += printf(" "); 2001 case -1: 2002 break; 2003 default: 2004 b += printf("%d-", n); 2005 break; 2006 } 2007 b += vprintf(fmt, ap); 2008 b += printf("\r\n"); 2009 total_bytes += b; 2010 total_bytes_out += b; 2011 (void)fflush(stdout); 2012 if (debug) { 2013 syslog(LOG_DEBUG, "<--- %d- ", n); 2014 vsyslog(LOG_DEBUG, fmt, ap); 2015 } 2016 } 2017 2018 static void 2019 ack(s) 2020 const char *s; 2021 { 2022 2023 reply(250, "%s command successful.", s); 2024 } 2025 2026 void 2027 delete(name) 2028 const char *name; 2029 { 2030 char *p = NULL; 2031 2032 if (remove(name) < 0) { 2033 p = strerror(errno); 2034 perror_reply(550, name); 2035 } else 2036 ack("DELE"); 2037 logcmd("delete", -1, name, NULL, NULL, p); 2038 } 2039 2040 void 2041 cwd(path) 2042 const char *path; 2043 { 2044 2045 if (chdir(path) < 0) 2046 perror_reply(550, path); 2047 else { 2048 show_chdir_messages(250); 2049 ack("CWD"); 2050 } 2051 } 2052 2053 static void 2054 replydirname(name, message) 2055 const char *name, *message; 2056 { 2057 char npath[MAXPATHLEN + 1]; 2058 int i; 2059 2060 for (i = 0; *name != '\0' && i < sizeof(npath) - 1; i++, name++) { 2061 npath[i] = *name; 2062 if (*name == '"') 2063 npath[++i] = '"'; 2064 } 2065 npath[i] = '\0'; 2066 reply(257, "\"%s\" %s", npath, message); 2067 } 2068 2069 void 2070 makedir(name) 2071 const char *name; 2072 { 2073 char *p = NULL; 2074 2075 if (mkdir(name, 0777) < 0) { 2076 p = strerror(errno); 2077 perror_reply(550, name); 2078 } else 2079 replydirname(name, "directory created."); 2080 logcmd("mkdir", -1, name, NULL, NULL, p); 2081 } 2082 2083 void 2084 removedir(name) 2085 const char *name; 2086 { 2087 char *p = NULL; 2088 2089 if (rmdir(name) < 0) { 2090 p = strerror(errno); 2091 perror_reply(550, name); 2092 } else 2093 ack("RMD"); 2094 logcmd("rmdir", -1, name, NULL, NULL, p); 2095 } 2096 2097 void 2098 pwd() 2099 { 2100 char path[MAXPATHLEN + 1]; 2101 2102 if (getcwd(path, sizeof(path) - 1) == NULL) 2103 reply(550, "Can't get the current directory: %s.", 2104 strerror(errno)); 2105 else 2106 replydirname(path, "is the current directory."); 2107 } 2108 2109 char * 2110 renamefrom(name) 2111 char *name; 2112 { 2113 struct stat st; 2114 2115 if (stat(name, &st) < 0) { 2116 perror_reply(550, name); 2117 return (NULL); 2118 } 2119 reply(350, "File exists, ready for destination name"); 2120 return (xstrdup(name)); 2121 } 2122 2123 void 2124 renamecmd(from, to) 2125 const char *from, *to; 2126 { 2127 char *p = NULL; 2128 2129 if (rename(from, to) < 0) { 2130 p = strerror(errno); 2131 perror_reply(550, "rename"); 2132 } else 2133 ack("RNTO"); 2134 logcmd("rename", -1, from, to, NULL, p); 2135 } 2136 2137 static void 2138 dolog(who) 2139 struct sockaddr *who; 2140 { 2141 getnameinfo(who, who->sa_len, remotehost, sizeof(remotehost), NULL,0,0); 2142 #ifdef HASSETPROCTITLE 2143 snprintf(proctitle, sizeof(proctitle), "%s: connected", remotehost); 2144 setproctitle(proctitle); 2145 #endif /* HASSETPROCTITLE */ 2146 if (logging) 2147 syslog(LOG_INFO, "connection from %s to %s", 2148 remotehost, hostname); 2149 } 2150 2151 /* 2152 * Record logout in wtmp file 2153 * and exit with supplied status. 2154 */ 2155 void 2156 dologout(status) 2157 int status; 2158 { 2159 /* 2160 * Prevent reception of SIGURG from resulting in a resumption 2161 * back to the main program loop. 2162 */ 2163 transflag = 0; 2164 2165 if (logged_in) { 2166 (void) seteuid((uid_t)0); 2167 logwtmp(ttyline, "", ""); 2168 if (doutmp) 2169 logout(utmp.ut_line); 2170 #ifdef KERBEROS 2171 if (!notickets && krbtkfile_env) 2172 unlink(krbtkfile_env); 2173 #endif 2174 } 2175 /* beware of flushing buffers after a SIGPIPE */ 2176 _exit(status); 2177 } 2178 2179 static void 2180 myoob(signo) 2181 int signo; 2182 { 2183 char *cp; 2184 2185 /* only process if transfer occurring */ 2186 if (!transflag) 2187 return; 2188 cp = tmpline; 2189 if (getline(cp, 7, stdin) == NULL) { 2190 reply(221, "You could at least say goodbye."); 2191 dologout(0); 2192 } 2193 if (strcasecmp(cp, "ABOR\r\n") == 0) { 2194 tmpline[0] = '\0'; 2195 reply(426, "Transfer aborted. Data connection closed."); 2196 reply(226, "Abort successful"); 2197 longjmp(urgcatch, 1); 2198 } 2199 if (strcasecmp(cp, "STAT\r\n") == 0) { 2200 tmpline[0] = '\0'; 2201 if (file_size != (off_t) -1) 2202 reply(213, "Status: %qd of %qd byte%s transferred", 2203 (qdfmt_t)byte_count, (qdfmt_t)file_size, 2204 PLURAL(byte_count)); 2205 else 2206 reply(213, "Status: %qd byte%s transferred", 2207 (qdfmt_t)byte_count, PLURAL(byte_count)); 2208 } 2209 } 2210 2211 /* 2212 * Note: a response of 425 is not mentioned as a possible response to 2213 * the PASV command in RFC959. However, it has been blessed as 2214 * a legitimate response by Jon Postel in a telephone conversation 2215 * with Rick Adams on 25 Jan 89. 2216 */ 2217 void 2218 passive() 2219 { 2220 int len; 2221 char *p, *a; 2222 2223 if (pdata >= 0) 2224 close(pdata); 2225 pdata = socket(AF_INET, SOCK_STREAM, 0); 2226 if (pdata < 0 || !logged_in) { 2227 perror_reply(425, "Can't open passive connection"); 2228 return; 2229 } 2230 pasv_addr = ctrl_addr; 2231 pasv_addr.su_port = 0; 2232 len = pasv_addr.su_len; 2233 if (bind(pdata, (struct sockaddr *)&pasv_addr, len) < 0) { 2234 goto pasv_error; 2235 } 2236 if (getsockname(pdata, (struct sockaddr *) &pasv_addr, &len) < 0) 2237 goto pasv_error; 2238 if (listen(pdata, 1) < 0) 2239 goto pasv_error; 2240 a = (char *) &pasv_addr.su_sin.sin_addr; 2241 p = (char *) &pasv_addr.su_port; 2242 2243 #define UC(b) (((int) b) & 0xff) 2244 2245 reply(227, "Entering Passive Mode (%d,%d,%d,%d,%d,%d)", UC(a[0]), 2246 UC(a[1]), UC(a[2]), UC(a[3]), UC(p[0]), UC(p[1])); 2247 return; 2248 2249 pasv_error: 2250 (void) close(pdata); 2251 pdata = -1; 2252 perror_reply(425, "Can't open passive connection"); 2253 return; 2254 } 2255 2256 /* 2257 * 228 Entering Long Passive Mode (af, hal, h1, h2, h3,..., pal, p1, p2...) 2258 * 229 Entering Extended Passive Mode (|||port|) 2259 */ 2260 void 2261 long_passive(char *cmd, int pf) 2262 { 2263 int len; 2264 register char *p, *a; 2265 2266 if (!logged_in) { 2267 syslog(LOG_NOTICE, "long passive but not logged in"); 2268 reply(503, "Login with USER first."); 2269 return; 2270 } 2271 2272 if (pf != PF_UNSPEC) { 2273 if (ctrl_addr.su_family != pf) { 2274 switch (ctrl_addr.su_family) { 2275 case AF_INET: 2276 pf = 1; 2277 break; 2278 case AF_INET6: 2279 pf = 2; 2280 break; 2281 default: 2282 pf = 0; 2283 break; 2284 } 2285 /* 2286 * XXX 2287 * only EPRT/EPSV ready clients will understand this 2288 */ 2289 if (strcmp(cmd, "EPSV") == 0 && pf) { 2290 reply(522, "Network protocol mismatch, " 2291 "use (%d)", pf); 2292 } else 2293 reply(501, "Network protocol mismatch"); /*XXX*/ 2294 2295 return; 2296 } 2297 } 2298 2299 if (pdata >= 0) 2300 close(pdata); 2301 pdata = socket(ctrl_addr.su_family, SOCK_STREAM, 0); 2302 if (pdata < 0) { 2303 perror_reply(425, "Can't open passive connection"); 2304 return; 2305 } 2306 pasv_addr = ctrl_addr; 2307 pasv_addr.su_port = 0; 2308 if (bind(pdata, (struct sockaddr *) &pasv_addr, pasv_addr.su_len) < 0) { 2309 goto pasv_error; 2310 } 2311 len = pasv_addr.su_len; 2312 if (getsockname(pdata, (struct sockaddr *) &pasv_addr, &len) < 0) 2313 goto pasv_error; 2314 if (listen(pdata, 1) < 0) 2315 goto pasv_error; 2316 p = (char *) &pasv_addr.su_port; 2317 2318 #define UC(b) (((int) b) & 0xff) 2319 2320 if (strcmp(cmd, "LPSV") == 0) { 2321 switch (pasv_addr.su_family) { 2322 case AF_INET: 2323 a = (char *) &pasv_addr.su_sin.sin_addr; 2324 reply(228, "Entering Long Passive Mode (%d,%d,%d,%d,%d,%d,%d,%d,%d)", 2325 4, 4, UC(a[0]), UC(a[1]), UC(a[2]), UC(a[3]), 2326 2, UC(p[0]), UC(p[1])); 2327 return; 2328 case AF_INET6: 2329 a = (char *) &pasv_addr.su_sin6.sin6_addr; 2330 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)", 2331 6, 16, 2332 UC(a[0]), UC(a[1]), UC(a[2]), UC(a[3]), 2333 UC(a[4]), UC(a[5]), UC(a[6]), UC(a[7]), 2334 UC(a[8]), UC(a[9]), UC(a[10]), UC(a[11]), 2335 UC(a[12]), UC(a[13]), UC(a[14]), UC(a[15]), 2336 2, UC(p[0]), UC(p[1])); 2337 return; 2338 } 2339 #undef UC 2340 } else if (strcmp(cmd, "EPSV") == 0) { 2341 switch (pasv_addr.su_family) { 2342 case AF_INET: 2343 case AF_INET6: 2344 reply(229, "Entering Extended Passive Mode (|||%d|)", 2345 ntohs(pasv_addr.su_port)); 2346 return; 2347 } 2348 } else { 2349 /* more proper error code? */ 2350 } 2351 2352 pasv_error: 2353 (void) close(pdata); 2354 pdata = -1; 2355 perror_reply(425, "Can't open passive connection"); 2356 return; 2357 } 2358 2359 /* 2360 * Generate unique name for file with basename "local". 2361 * The file named "local" is already known to exist. 2362 * Generates failure reply on error. 2363 * 2364 * XXX this function should under go changes similar to 2365 * the mktemp(3)/mkstemp(3) changes. 2366 */ 2367 static char * 2368 gunique(local) 2369 const char *local; 2370 { 2371 static char new[MAXPATHLEN + 1]; 2372 struct stat st; 2373 char *cp; 2374 int count; 2375 2376 cp = strrchr(local, '/'); 2377 if (cp) 2378 *cp = '\0'; 2379 if (stat(cp ? local : ".", &st) < 0) { 2380 perror_reply(553, cp ? local : "."); 2381 return (NULL); 2382 } 2383 if (cp) 2384 *cp = '/'; 2385 for (count = 1; count < 100; count++) { 2386 (void)snprintf(new, sizeof(new) - 1, "%s.%d", local, count); 2387 if (stat(new, &st) < 0) 2388 return (new); 2389 } 2390 reply(452, "Unique file name cannot be created."); 2391 return (NULL); 2392 } 2393 2394 /* 2395 * Format and send reply containing system error number. 2396 */ 2397 void 2398 perror_reply(code, string) 2399 int code; 2400 const char *string; 2401 { 2402 int save_errno; 2403 2404 save_errno = errno; 2405 reply(code, "%s: %s.", string, strerror(errno)); 2406 errno = save_errno; 2407 } 2408 2409 static char *onefile[] = { 2410 "", 2411 0 2412 }; 2413 2414 void 2415 send_file_list(whichf) 2416 const char *whichf; 2417 { 2418 struct stat st; 2419 DIR *dirp = NULL; 2420 struct dirent *dir; 2421 FILE *dout = NULL; 2422 char **dirlist, *dirname, *p; 2423 int simple = 0; 2424 int freeglob = 0; 2425 glob_t gl; 2426 off_t b; 2427 2428 #ifdef __GNUC__ 2429 (void) &dout; 2430 (void) &dirlist; 2431 (void) &simple; 2432 (void) &freeglob; 2433 #endif 2434 2435 p = NULL; 2436 if (strpbrk(whichf, "~{[*?") != NULL) { 2437 int flags = GLOB_BRACE|GLOB_NOCHECK|GLOB_TILDE; 2438 2439 memset(&gl, 0, sizeof(gl)); 2440 freeglob = 1; 2441 if (glob(whichf, flags, 0, &gl)) { 2442 reply(550, "not found"); 2443 goto out; 2444 } else if (gl.gl_pathc == 0) { 2445 errno = ENOENT; 2446 perror_reply(550, whichf); 2447 goto out; 2448 } 2449 dirlist = gl.gl_pathv; 2450 } else { 2451 p = xstrdup(whichf); 2452 onefile[0] = p; 2453 dirlist = onefile; 2454 simple = 1; 2455 } 2456 /* XXX: } for vi sm */ 2457 2458 if (setjmp(urgcatch)) { 2459 transflag = 0; 2460 goto out; 2461 } 2462 while ((dirname = *dirlist++) != NULL) { 2463 int trailingslash = 0; 2464 2465 if (stat(dirname, &st) < 0) { 2466 /* 2467 * If user typed "ls -l", etc, and the client 2468 * used NLST, do what the user meant. 2469 */ 2470 /* XXX: nuke this support? */ 2471 if (dirname[0] == '-' && *dirlist == NULL && 2472 transflag == 0) { 2473 char *argv[] = { INTERNAL_LS, "", NULL }; 2474 2475 argv[1] = dirname; 2476 retrieve(argv, dirname); 2477 goto out; 2478 } 2479 perror_reply(550, whichf); 2480 if (dout != NULL) { 2481 (void) fclose(dout); 2482 transflag = 0; 2483 data = -1; 2484 pdata = -1; 2485 } 2486 goto out; 2487 } 2488 2489 if (S_ISREG(st.st_mode)) { 2490 if (dout == NULL) { 2491 dout = dataconn("file list", (off_t)-1, "w"); 2492 if (dout == NULL) 2493 goto out; 2494 transflag++; 2495 } 2496 b = fprintf(dout, "%s%s\n", dirname, 2497 type == TYPE_A ? "\r" : ""); 2498 total_bytes += b; 2499 total_bytes_out += b; 2500 byte_count += strlen(dirname) + 1; 2501 continue; 2502 } else if (!S_ISDIR(st.st_mode)) 2503 continue; 2504 2505 if (dirname[strlen(dirname) - 1] == '/') 2506 trailingslash++; 2507 2508 if ((dirp = opendir(dirname)) == NULL) 2509 continue; 2510 2511 while ((dir = readdir(dirp)) != NULL) { 2512 char nbuf[MAXPATHLEN + 1]; 2513 2514 if (dir->d_name[0] == '.' && dir->d_namlen == 1) 2515 continue; 2516 if (dir->d_name[0] == '.' && dir->d_name[1] == '.' && 2517 dir->d_namlen == 2) 2518 continue; 2519 2520 (void)snprintf(nbuf, sizeof(nbuf), "%s%s%s", dirname, 2521 trailingslash ? "" : "/", dir->d_name); 2522 2523 /* 2524 * We have to do a stat to ensure it's 2525 * not a directory or special file. 2526 */ 2527 /* XXX: follow RFC959 and filter out non files ? */ 2528 if (simple || (stat(nbuf, &st) == 0 && 2529 S_ISREG(st.st_mode))) { 2530 char *p; 2531 2532 if (dout == NULL) { 2533 dout = dataconn("file list", (off_t)-1, 2534 "w"); 2535 if (dout == NULL) 2536 goto out; 2537 transflag++; 2538 } 2539 p = nbuf; 2540 if (nbuf[0] == '.' && nbuf[1] == '/') 2541 p = &nbuf[2]; 2542 b = fprintf(dout, "%s%s\n", p, 2543 type == TYPE_A ? "\r" : ""); 2544 total_bytes += b; 2545 total_bytes_out += b; 2546 byte_count += strlen(nbuf) + 1; 2547 } 2548 } 2549 (void) closedir(dirp); 2550 } 2551 2552 if (dout == NULL) 2553 reply(550, "No files found."); 2554 else if (ferror(dout) != 0) 2555 perror_reply(550, "Data connection"); 2556 else 2557 reply(226, "Transfer complete."); 2558 2559 transflag = 0; 2560 if (dout != NULL) 2561 (void) fclose(dout); 2562 data = -1; 2563 pdata = -1; 2564 out: 2565 total_xfers++; 2566 total_xfers_out++; 2567 if (p) 2568 free(p); 2569 if (freeglob) 2570 globfree(&gl); 2571 } 2572 2573 char * 2574 conffilename(s) 2575 const char *s; 2576 { 2577 static char filename[MAXPATHLEN + 1]; 2578 2579 if (*s == '/') 2580 strlcpy(filename, s, sizeof(filename)); 2581 else 2582 (void)snprintf(filename, sizeof(filename), "%s/%s", confdir ,s); 2583 return (filename); 2584 } 2585 2586 /* 2587 * logcmd -- 2588 * based on the arguments, syslog a message: 2589 * if bytes != -1 "<command> <file1> = <bytes> bytes" 2590 * else if file2 != NULL "<command> <file1> <file2>" 2591 * else "<command> <file1>" 2592 * if elapsed != NULL, append "in xxx.yyy seconds" 2593 * if error != NULL, append ": " + error 2594 */ 2595 2596 void 2597 logcmd(command, bytes, file1, file2, elapsed, error) 2598 const char *command; 2599 off_t bytes; 2600 const char *file1; 2601 const char *file2; 2602 const struct timeval *elapsed; 2603 const char *error; 2604 { 2605 char buf[MAXPATHLEN * 2 + 100], realfile[MAXPATHLEN + 1]; 2606 const char *p; 2607 size_t len; 2608 2609 if (logging <=1) 2610 return; 2611 2612 if ((p = realpath(file1, realfile)) == NULL) { 2613 #if 0 /* XXX: too noisy */ 2614 syslog(LOG_WARNING, "realpath `%s' failed: %s", 2615 realfile, strerror(errno)); 2616 #endif 2617 p = file1; 2618 } 2619 len = snprintf(buf, sizeof(buf), "%s %s", command, p); 2620 2621 if (bytes != (off_t)-1) { 2622 len += snprintf(buf + len, sizeof(buf) - len, 2623 " = %qd byte%s", (qdfmt_t) bytes, PLURAL(bytes)); 2624 } else if (file2 != NULL) { 2625 if ((p = realpath(file2, realfile)) == NULL) { 2626 #if 0 /* XXX: too noisy */ 2627 syslog(LOG_WARNING, "realpath `%s' failed: %s", 2628 realfile, strerror(errno)); 2629 #endif 2630 p = file2; 2631 } 2632 len += snprintf(buf + len, sizeof(buf) - len, " %s", p); 2633 } 2634 2635 if (elapsed != NULL) { 2636 len += snprintf(buf + len, sizeof(buf) - len, 2637 " in %ld.%.03d seconds", elapsed->tv_sec, 2638 (int)(elapsed->tv_usec / 1000)); 2639 } 2640 2641 if (error != NULL) 2642 len += snprintf(buf + len, sizeof(buf) - len, ": %s", error); 2643 2644 syslog(LOG_INFO, "%s", buf); 2645 } 2646 2647 char * 2648 xstrdup(s) 2649 const char *s; 2650 { 2651 char *new = strdup(s); 2652 2653 if (new == NULL) 2654 fatal("Local resource failure: malloc"); 2655 /* NOTREACHED */ 2656 return (new); 2657 } 2658
Indexes created Fri Sep 26 20:09:58 GMT 2025