ftpd.c revision 1.79
1 /* $NetBSD: ftpd.c,v 1.79 1999/12/18 06:33:54 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 1.79 1999/12/18 06:33:54 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 <limits.h> 142 #include <netdb.h> 143 #include <pwd.h> 144 #include <setjmp.h> 145 #include <signal.h> 146 #include <stdio.h> 147 #include <stdlib.h> 148 #include <string.h> 149 #include <syslog.h> 150 #include <time.h> 151 #include <unistd.h> 152 #include <util.h> 153 #include <utmp.h> 154 #ifdef SKEY 155 #include <skey.h> 156 #endif 157 #ifdef KERBEROS5 158 #include <kerberosIV/com_err.h> 159 #include <krb5/krb5.h> 160 #endif 161 162 #include "extern.h" 163 #include "pathnames.h" 164 #include "version.h" 165 166 #if __STDC__ 167 #include <stdarg.h> 168 #else 169 #include <varargs.h> 170 #endif 171 172 const char version[] = FTPD_VERSION; 173 174 union sockunion ctrl_addr; 175 union sockunion data_source; 176 union sockunion data_dest; 177 union sockunion his_addr; 178 union sockunion pasv_addr; 179 180 int data; 181 jmp_buf errcatch, urgcatch; 182 int logged_in; 183 struct passwd *pw; 184 int debug; 185 int sflag; 186 int logging; 187 int type; 188 int form; 189 int stru; /* avoid C keyword */ 190 int mode; 191 int doutmp = 0; /* update utmp file */ 192 int usedefault = 1; /* for data transfers */ 193 int pdata = -1; /* for passive mode */ 194 int family = AF_INET; 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 static void ack __P((const char *)); 245 static void myoob __P((int)); 246 static int checkuser __P((const char *, const char *, int, int, char **)); 247 static int checkaccess __P((const char *)); 248 static FILE *dataconn __P((const char *, off_t, const char *)); 249 static void dolog __P((struct sockaddr *)); 250 static void end_login __P((void)); 251 static FILE *getdatasock __P((const char *)); 252 static char *gunique __P((const char *)); 253 static void lostconn __P((int)); 254 static int receive_data __P((FILE *, FILE *)); 255 static void replydirname __P((const char *, const char *)); 256 static int send_data __P((FILE *, FILE *, off_t, int)); 257 static struct passwd * 258 sgetpwnam __P((const char *)); 259 260 int main __P((int, char *[])); 261 262 #if defined(KERBEROS) || defined(KERBEROS5) 263 int klogin __P((struct passwd *, char *, char *, char *)); 264 void kdestroy __P((void)); 265 #endif 266 267 int 268 main(argc, argv) 269 int argc; 270 char *argv[]; 271 { 272 int addrlen, ch, on = 1, tos, keepalive; 273 #ifdef KERBEROS5 274 krb5_error_code kerror; 275 #endif 276 277 debug = 0; 278 logging = 0; 279 sflag = 0; 280 (void)strcpy(confdir, _DEFAULT_CONFDIR); 281 282 while ((ch = getopt(argc, argv, "a:c:C:dlst:T:u:Uv46")) != -1) { 283 switch (ch) { 284 case 'a': 285 anondir = optarg; 286 break; 287 288 case 'c': 289 (void)strlcpy(confdir, optarg, sizeof(confdir)); 290 break; 291 292 case 'C': 293 exit(checkaccess(optarg) ? 0 : 1); 294 /* NOTREACHED */ 295 296 case 'd': 297 case 'v': /* deprecated */ 298 debug = 1; 299 break; 300 301 case 'l': 302 logging++; /* > 1 == extra logging */ 303 break; 304 305 case 's': 306 sflag = 1; 307 break; 308 309 case 't': 310 case 'T': 311 case 'u': 312 warnx("-%c has been deprecated in favour of ftpd.conf", 313 ch); 314 break; 315 316 case 'U': 317 doutmp = 1; 318 break; 319 320 case '4': 321 family = AF_INET; 322 break; 323 324 case '6': 325 family = AF_INET6; 326 break; 327 328 default: 329 if (optopt == 'a' || optopt == 'C') 330 exit(1); 331 warnx("unknown flag -%c ignored", optopt); 332 break; 333 } 334 } 335 336 /* 337 * LOG_NDELAY sets up the logging connection immediately, 338 * necessary for anonymous ftp's that chroot and can't do it later. 339 */ 340 openlog("ftpd", LOG_PID | LOG_NDELAY, LOG_FTP); 341 addrlen = sizeof(his_addr); /* xxx */ 342 if (getpeername(0, (struct sockaddr *)&his_addr, &addrlen) < 0) { 343 syslog(LOG_ERR, "getpeername (%s): %m",argv[0]); 344 exit(1); 345 } 346 addrlen = sizeof(ctrl_addr); 347 if (getsockname(0, (struct sockaddr *)&ctrl_addr, &addrlen) < 0) { 348 syslog(LOG_ERR, "getsockname (%s): %m",argv[0]); 349 exit(1); 350 } 351 if (his_addr.su_family == AF_INET6 352 && IN6_IS_ADDR_V4MAPPED(&his_addr.su_sin6.sin6_addr)) { 353 #if 1 354 /* 355 * IPv4 control connection arrived to AF_INET6 socket. 356 * I hate to do this, but this is the easiest solution. 357 */ 358 union sockunion tmp_addr; 359 const int off = sizeof(struct in6_addr) - sizeof(struct in_addr); 360 361 tmp_addr = his_addr; 362 memset(&his_addr, 0, sizeof(his_addr)); 363 his_addr.su_sin.sin_family = AF_INET; 364 his_addr.su_sin.sin_len = sizeof(his_addr.su_sin); 365 memcpy(&his_addr.su_sin.sin_addr, 366 &tmp_addr.su_sin6.sin6_addr.s6_addr[off], 367 sizeof(his_addr.su_sin.sin_addr)); 368 his_addr.su_sin.sin_port = tmp_addr.su_sin6.sin6_port; 369 370 tmp_addr = ctrl_addr; 371 memset(&ctrl_addr, 0, sizeof(ctrl_addr)); 372 ctrl_addr.su_sin.sin_family = AF_INET; 373 ctrl_addr.su_sin.sin_len = sizeof(ctrl_addr.su_sin); 374 memcpy(&ctrl_addr.su_sin.sin_addr, 375 &tmp_addr.su_sin6.sin6_addr.s6_addr[off], 376 sizeof(ctrl_addr.su_sin.sin_addr)); 377 ctrl_addr.su_sin.sin_port = tmp_addr.su_sin6.sin6_port; 378 #else 379 while (fgets(line, sizeof(line), fd) != NULL) { 380 if ((cp = strchr(line, '\n')) != NULL) 381 *cp = '\0'; 382 lreply(530, "%s", line); 383 } 384 (void) fflush(stdout); 385 (void) fclose(fd); 386 reply(530, 387 "Connection from IPv4 mapped address is not supported."); 388 exit(0); 389 #endif 390 391 mapped = 1; 392 } else 393 mapped = 0; 394 #ifdef IP_TOS 395 if (!mapped && his_addr.su_family == AF_INET) { 396 tos = IPTOS_LOWDELAY; 397 if (setsockopt(0, IPPROTO_IP, IP_TOS, (char *)&tos, 398 sizeof(int)) < 0) 399 syslog(LOG_WARNING, "setsockopt (IP_TOS): %m"); 400 } 401 #endif 402 data_source.su_port = htons(ntohs(ctrl_addr.su_port) - 1); 403 404 if (getnameinfo((struct sockaddr *)&ctrl_addr, ctrl_addr.su_len, 405 hostname, sizeof(hostname), NULL, 0, 0) != 0) 406 (void)gethostname(hostname, sizeof(hostname)); 407 hostname[sizeof(hostname) - 1] = '\0'; 408 409 /* set this here so klogin can use it... */ 410 (void)snprintf(ttyline, sizeof(ttyline), "ftp%d", getpid()); 411 412 (void) freopen(_PATH_DEVNULL, "w", stderr); 413 (void) signal(SIGPIPE, lostconn); 414 (void) signal(SIGCHLD, SIG_IGN); 415 if (signal(SIGURG, myoob) == SIG_ERR) 416 syslog(LOG_ERR, "signal: %m"); 417 418 /* Try to handle urgent data inline */ 419 #ifdef SO_OOBINLINE 420 if (setsockopt(0, SOL_SOCKET, SO_OOBINLINE, (char *)&on, sizeof(on)) < 0) 421 syslog(LOG_ERR, "setsockopt: %m"); 422 #endif 423 /* Set keepalives on the socket to detect dropped connections. */ 424 #ifdef SO_KEEPALIVE 425 keepalive = 1; 426 if (setsockopt(0, SOL_SOCKET, SO_KEEPALIVE, (char *)&keepalive, 427 sizeof(int)) < 0) 428 syslog(LOG_WARNING, "setsockopt (SO_KEEPALIVE): %m"); 429 #endif 430 431 #ifdef F_SETOWN 432 if (fcntl(fileno(stdin), F_SETOWN, getpid()) == -1) 433 syslog(LOG_ERR, "fcntl F_SETOWN: %m"); 434 #endif 435 dolog((struct sockaddr *)&his_addr); 436 /* 437 * Set up default state 438 */ 439 data = -1; 440 type = TYPE_A; 441 form = FORM_N; 442 stru = STRU_F; 443 mode = MODE_S; 444 tmpline[0] = '\0'; 445 hasyyerrored = 0; 446 447 #ifdef KERBEROS5 448 kerror = krb5_init_context(&kcontext); 449 if (kerror) { 450 syslog(LOG_NOTICE, "%s when initializing Kerberos context", 451 error_message(kerror)); 452 exit(0); 453 } 454 #endif /* KERBEROS5 */ 455 456 /* If logins are disabled, print out the message. */ 457 if (format_file(_PATH_NOLOGIN, 530)) { 458 reply(530, "System not available."); 459 exit(0); 460 } 461 (void)format_file(conffilename(_PATH_FTPWELCOME), 220); 462 /* reply(220,) must follow */ 463 reply(220, "%s FTP server (%s) ready.", hostname, version); 464 465 curclass.timeout = 300; /* 5 minutes, as per login(1) */ 466 curclass.type = CLASS_REAL; 467 468 (void) setjmp(errcatch); 469 for (;;) 470 (void) yyparse(); 471 /* NOTREACHED */ 472 } 473 474 static void 475 lostconn(signo) 476 int signo; 477 { 478 479 if (debug) 480 syslog(LOG_DEBUG, "lost connection"); 481 dologout(1); 482 } 483 484 /* 485 * Save the result of a getpwnam. Used for USER command, since 486 * the data returned must not be clobbered by any other command 487 * (e.g., globbing). 488 */ 489 static struct passwd * 490 sgetpwnam(name) 491 const char *name; 492 { 493 static struct passwd save; 494 struct passwd *p; 495 496 if ((p = getpwnam(name)) == NULL) 497 return (p); 498 if (save.pw_name) { 499 free((char *)save.pw_name); 500 memset(save.pw_passwd, 0, strlen(save.pw_passwd)); 501 free((char *)save.pw_passwd); 502 free((char *)save.pw_gecos); 503 free((char *)save.pw_dir); 504 free((char *)save.pw_shell); 505 } 506 save = *p; 507 save.pw_name = xstrdup(p->pw_name); 508 save.pw_passwd = xstrdup(p->pw_passwd); 509 save.pw_gecos = xstrdup(p->pw_gecos); 510 save.pw_dir = xstrdup(p->pw_dir); 511 save.pw_shell = xstrdup(p->pw_shell); 512 return (&save); 513 } 514 515 static int login_attempts; /* number of failed login attempts */ 516 static int askpasswd; /* had user command, ask for passwd */ 517 static char curname[10]; /* current USER name */ 518 519 /* 520 * USER command. 521 * Sets global passwd pointer pw if named account exists and is acceptable; 522 * sets askpasswd if a PASS command is expected. If logged in previously, 523 * need to reset state. If name is "ftp" or "anonymous", the name is not in 524 * _PATH_FTPUSERS, and ftp account exists, set guest and pw, then just return. 525 * If account doesn't exist, ask for passwd anyway. Otherwise, check user 526 * requesting login privileges. Disallow anyone who does not have a standard 527 * shell as returned by getusershell(). Disallow anyone mentioned in the file 528 * _PATH_FTPUSERS to allow people such as root and uucp to be avoided. 529 */ 530 void 531 user(name) 532 const char *name; 533 { 534 if (logged_in) { 535 switch (curclass.type) { 536 case CLASS_GUEST: 537 reply(530, "Can't change user from guest login."); 538 return; 539 case CLASS_CHROOT: 540 reply(530, "Can't change user from chroot user."); 541 return; 542 case CLASS_REAL: 543 end_login(); 544 break; 545 default: 546 abort(); 547 } 548 } 549 550 #if defined(KERBEROS) || defined(KERBEROS5) 551 kdestroy(); 552 #endif 553 554 curclass.type = CLASS_REAL; 555 if (strcmp(name, "ftp") == 0 || strcmp(name, "anonymous") == 0) { 556 if (! checkaccess("ftp") && ! checkaccess("anonymous")) 557 reply(530, "User %s access denied.", name); 558 else if ((pw = sgetpwnam("ftp")) != NULL) { 559 curclass.type = CLASS_GUEST; 560 askpasswd = 1; 561 reply(331, 562 "Guest login ok, type your name as password."); 563 } else 564 reply(530, "User %s unknown.", name); 565 if (!askpasswd && logging) 566 syslog(LOG_NOTICE, 567 "ANONYMOUS FTP LOGIN REFUSED FROM %s", remotehost); 568 return; 569 } 570 571 pw = sgetpwnam(name); 572 if (logging) 573 strlcpy(curname, name, sizeof(curname)); 574 575 #ifdef SKEY 576 if (skey_haskey(name) == 0) { 577 char *myskey; 578 579 myskey = skey_keyinfo(name); 580 reply(331, "Password [%s] required for %s.", 581 myskey ? myskey : "error getting challenge", name); 582 } else 583 #endif 584 reply(331, "Password required for %s.", name); 585 586 askpasswd = 1; 587 /* 588 * Delay before reading passwd after first failed 589 * attempt to slow down passwd-guessing programs. 590 */ 591 if (login_attempts) 592 sleep((unsigned) login_attempts); 593 } 594 595 /* 596 * Determine whether something is to happen (allow access, chroot) 597 * for a user. Each line is a shell-style glob followed by 598 * `yes' or `no'. 599 * 600 * For backward compatability, `allow' and `deny' are synonymns 601 * for `yes' and `no', respectively. 602 * 603 * Each glob is matched against the username in turn, and the first 604 * match found is used. If no match is found, the result is the 605 * argument `def'. If a match is found but without and explicit 606 * `yes'/`no', the result is the opposite of def. 607 * 608 * If the file doesn't exist at all, the result is the argument 609 * `nofile' 610 * 611 * Any line starting with `#' is considered a comment and ignored. 612 * 613 * Returns 0 if the user is denied, or 1 if they are allowed. 614 */ 615 int 616 checkuser(fname, name, def, nofile, retclass) 617 const char *fname, *name; 618 int def, nofile; 619 char **retclass; 620 { 621 FILE *fd; 622 int retval; 623 char *glob, *perm, *class, *buf, *p; 624 size_t len, line; 625 626 retval = def; 627 if (retclass != NULL) 628 *retclass = NULL; 629 if ((fd = fopen(conffilename(fname), "r")) == NULL) 630 return nofile; 631 632 line = 0; 633 for (; 634 (buf = fparseln(fd, &len, &line, NULL, FPARSELN_UNESCCOMM | 635 FPARSELN_UNESCCONT | FPARSELN_UNESCESC)) != NULL; 636 free(buf), buf = NULL) { 637 glob = perm = class = NULL; 638 p = buf; 639 if (len < 1) 640 continue; 641 if (p[len - 1] == '\n') 642 p[--len] = '\0'; 643 if (EMPTYSTR(p)) 644 continue; 645 646 NEXTWORD(p, glob); 647 NEXTWORD(p, perm); 648 NEXTWORD(p, class); 649 if (EMPTYSTR(glob)) 650 continue; 651 if (!EMPTYSTR(class)) { 652 if (strcasecmp(class, "all") == 0 || 653 strcasecmp(class, "none") == 0) { 654 syslog(LOG_WARNING, 655 "%s line %d: illegal user-defined class `%s' - skipping entry", 656 fname, (int)line, class); 657 continue; 658 } 659 } 660 661 /* have a host specifier */ 662 if ((p = strchr(glob, '@')) != NULL) { 663 u_int32_t net, mask, addr; 664 int bits; 665 666 *p++ = '\0'; 667 /* check against network or CIDR */ 668 if (isdigit(*p) && 669 (bits = inet_net_pton(AF_INET, p, 670 &net, sizeof(net))) != -1) { 671 net = ntohl(net); 672 mask = 0xffffffffU << (32 - bits); 673 addr = ntohl(his_addr.su_sin.sin_addr.s_addr); 674 if ((addr & mask) != net) 675 continue; 676 677 /* check against hostname glob */ 678 } else if (fnmatch(p, remotehost, 0) != 0) 679 continue; 680 } 681 682 /* check against username glob */ 683 if (fnmatch(glob, name, 0) != 0) 684 continue; 685 686 if (perm != NULL && 687 ((strcasecmp(perm, "allow") == 0) || 688 (strcasecmp(perm, "yes") == 0))) 689 retval = 1; 690 else if (perm != NULL && 691 ((strcasecmp(perm, "deny") == 0) || 692 (strcasecmp(perm, "no") == 0))) 693 retval = 0; 694 else 695 retval = !def; 696 if (!EMPTYSTR(class) && retclass != NULL) 697 *retclass = xstrdup(class); 698 free(buf); 699 break; 700 } 701 (void) fclose(fd); 702 return (retval); 703 } 704 705 /* 706 * Check if user is allowed by /etc/ftpusers 707 * returns 1 for yes, 0 for no 708 */ 709 int 710 checkaccess(name) 711 const char *name; 712 { 713 714 return (checkuser(_PATH_FTPUSERS, name, 1, 0, NULL)); 715 } 716 717 /* 718 * Terminate login as previous user, if any, resetting state; 719 * used when USER command is given or login fails. 720 */ 721 static void 722 end_login() 723 { 724 725 (void) seteuid((uid_t)0); 726 if (logged_in) { 727 logwtmp(ttyline, "", ""); 728 if (doutmp) 729 logout(utmp.ut_line); 730 } 731 pw = NULL; 732 logged_in = 0; 733 curclass.type = CLASS_REAL; 734 } 735 736 void 737 pass(passwd) 738 const char *passwd; 739 { 740 int rval; 741 const char *cp, *shell, *home; 742 char *class; 743 744 class = NULL; 745 if (logged_in || askpasswd == 0) { 746 reply(503, "Login with USER first."); 747 return; 748 } 749 askpasswd = 0; 750 if (curclass.type != CLASS_GUEST) { 751 /* "ftp" is only account allowed no password */ 752 if (pw == NULL) { 753 rval = 1; /* failure below */ 754 goto skip; 755 } 756 #if defined(KERBEROS) || defined(KERBEROS5) 757 if (klogin(pw, "", hostname, (char *)passwd) == 0) { 758 rval = 0; 759 goto skip; 760 } 761 #endif 762 #ifdef SKEY 763 if (skey_haskey(pw->pw_name) == 0) { 764 char *p; 765 int r; 766 767 p = xstrdup(passwd); 768 r = skey_passcheck(pw->pw_name, p); 769 free(p); 770 if (r != -1) { 771 rval = 0; 772 goto skip; 773 } 774 } 775 #endif 776 if (!sflag && *pw->pw_passwd != '\0' && 777 !strcmp(crypt(passwd, pw->pw_passwd), pw->pw_passwd)) { 778 rval = 0; 779 goto skip; 780 } 781 rval = 1; 782 783 skip: 784 if (pw != NULL && pw->pw_expire && time(NULL) >= pw->pw_expire) 785 rval = 2; 786 /* 787 * If rval > 0, the user failed the authentication check 788 * above. If rval == 0, either Kerberos or local authentication 789 * succeeded. 790 */ 791 if (rval) { 792 reply(530, rval == 2 ? "Password expired." : 793 "Login incorrect."); 794 if (logging) { 795 syslog(LOG_NOTICE, 796 "FTP LOGIN FAILED FROM %s", remotehost); 797 syslog(LOG_AUTHPRIV | LOG_NOTICE, 798 "FTP LOGIN FAILED FROM %s, %s", 799 remotehost, curname); 800 } 801 pw = NULL; 802 if (login_attempts++ >= 5) { 803 syslog(LOG_NOTICE, 804 "repeated login failures from %s", 805 remotehost); 806 exit(0); 807 } 808 return; 809 } 810 } 811 812 /* password was ok; see if anything else prevents login */ 813 if (! checkuser(_PATH_FTPUSERS, pw->pw_name, 1, 0, &class)) { 814 reply(530, "User %s may not use FTP.", pw->pw_name); 815 if (logging) 816 syslog(LOG_NOTICE, "FTP LOGIN REFUSED FROM %s, %s", 817 remotehost, pw->pw_name); 818 pw = (struct passwd *) NULL; 819 goto cleanuppass; 820 } 821 /* check for valid shell, if not guest user */ 822 if ((shell = pw->pw_shell) == NULL || *shell == 0) 823 shell = _PATH_BSHELL; 824 while ((cp = getusershell()) != NULL) 825 if (strcmp(cp, shell) == 0) 826 break; 827 endusershell(); 828 if (cp == NULL && curclass.type != CLASS_GUEST) { 829 reply(530, "User %s may not use FTP.", pw->pw_name); 830 if (logging) 831 syslog(LOG_NOTICE, "FTP LOGIN REFUSED FROM %s, %s", 832 remotehost, pw->pw_name); 833 pw = (struct passwd *) NULL; 834 goto cleanuppass; 835 } 836 837 login_attempts = 0; /* this time successful */ 838 if (setegid((gid_t)pw->pw_gid) < 0) { 839 reply(550, "Can't set gid."); 840 goto cleanuppass; 841 } 842 (void) initgroups(pw->pw_name, pw->pw_gid); 843 844 /* open wtmp before chroot */ 845 logwtmp(ttyline, pw->pw_name, remotehost); 846 847 /* open utmp before chroot */ 848 if (doutmp) { 849 memset((void *)&utmp, 0, sizeof(utmp)); 850 (void)time(&utmp.ut_time); 851 (void)strncpy(utmp.ut_name, pw->pw_name, sizeof(utmp.ut_name)); 852 (void)strncpy(utmp.ut_host, remotehost, sizeof(utmp.ut_host)); 853 (void)strncpy(utmp.ut_line, ttyline, sizeof(utmp.ut_line)); 854 login(&utmp); 855 } 856 857 logged_in = 1; 858 859 /* check user in /etc/ftpchroot */ 860 if (checkuser(_PATH_FTPCHROOT, pw->pw_name, 0, 0, NULL)) { 861 if (curclass.type == CLASS_GUEST) { 862 syslog(LOG_NOTICE, 863 "Can't change guest user to chroot class; remove entry in %s", 864 _PATH_FTPCHROOT); 865 exit(1); 866 } 867 curclass.type = CLASS_CHROOT; 868 } 869 if (class == NULL) { 870 switch (curclass.type) { 871 case CLASS_GUEST: 872 class = xstrdup("guest"); 873 break; 874 case CLASS_CHROOT: 875 class = xstrdup("chroot"); 876 break; 877 case CLASS_REAL: 878 class = xstrdup("real"); 879 break; 880 default: 881 abort(); 882 } 883 } 884 885 /* parse ftpd.conf, setting up various parameters */ 886 parse_conf(class); 887 888 home = "/"; 889 switch (curclass.type) { 890 case CLASS_GUEST: 891 /* 892 * We MUST do a chdir() after the chroot. Otherwise 893 * the old current directory will be accessible as "." 894 * outside the new root! 895 */ 896 if (chroot(anondir ? anondir : pw->pw_dir) < 0 || 897 chdir("/") < 0) { 898 reply(550, "Can't set guest privileges."); 899 goto bad; 900 } 901 break; 902 case CLASS_CHROOT: 903 if (chroot(pw->pw_dir) < 0 || chdir("/") < 0) { 904 reply(550, "Can't change root."); 905 goto bad; 906 } 907 break; 908 case CLASS_REAL: 909 if (chdir(pw->pw_dir) < 0) { 910 if (chdir("/") < 0) { 911 reply(530, 912 "User %s: can't change directory to %s.", 913 pw->pw_name, pw->pw_dir); 914 goto bad; 915 } else 916 lreply(230, 917 "No directory! Logging in with home=/"); 918 } else 919 home = pw->pw_dir; 920 break; 921 } 922 if (seteuid((uid_t)pw->pw_uid) < 0) { 923 reply(550, "Can't set uid."); 924 goto bad; 925 } 926 setenv("HOME", home, 1); 927 928 /* 929 * Display a login message, if it exists. 930 * N.B. reply(230,) must follow the message. 931 */ 932 (void)format_file(conffilename(curclass.motd), 230); 933 show_chdir_messages(230); 934 if (curclass.type == CLASS_GUEST) { 935 reply(230, "Guest login ok, access restrictions apply."); 936 #ifdef HASSETPROCTITLE 937 snprintf(proctitle, sizeof(proctitle), 938 "%s: anonymous/%.*s", remotehost, 939 (int) (sizeof(proctitle) - sizeof(remotehost) - 940 sizeof(": anonymous/")), passwd); 941 setproctitle(proctitle); 942 #endif /* HASSETPROCTITLE */ 943 if (logging) 944 syslog(LOG_INFO, "ANONYMOUS FTP LOGIN FROM %s, %s", 945 remotehost, passwd); 946 } else { 947 reply(230, "User %s logged in.", pw->pw_name); 948 #ifdef HASSETPROCTITLE 949 snprintf(proctitle, sizeof(proctitle), 950 "%s: %s", remotehost, pw->pw_name); 951 setproctitle(proctitle); 952 #endif /* HASSETPROCTITLE */ 953 if (logging) 954 syslog(LOG_INFO, "FTP LOGIN FROM %s as %s", 955 remotehost, pw->pw_name); 956 } 957 (void) umask(curclass.umask); 958 goto cleanuppass; 959 bad: 960 /* Forget all about it... */ 961 end_login(); 962 cleanuppass: 963 if (class) 964 free(class); 965 } 966 967 void 968 retrieve(argv, name) 969 char *argv[]; 970 const char *name; 971 { 972 FILE *fin = NULL, *dout; 973 struct stat st; 974 int (*closefunc) __P((FILE *)) = NULL; 975 int log, sendrv, closerv, stderrfd, isconversion, isdata, isls; 976 struct timeval start, finish, td, *tdp; 977 const char *dispname; 978 979 sendrv = closerv = stderrfd = -1; 980 isconversion = isdata = isls = log = 0; 981 tdp = NULL; 982 dispname = name; 983 if (argv == NULL) { 984 log = 1; 985 isdata = 1; 986 fin = fopen(name, "r"); 987 closefunc = fclose; 988 if (fin == NULL) 989 argv = do_conversion(name); 990 if (argv != NULL) { 991 isconversion++; 992 syslog(LOG_INFO, "get command: '%s' on '%s'", 993 argv[0], name); 994 } 995 } 996 if (argv != NULL) { 997 char temp[MAXPATHLEN + 1]; 998 999 if (strcmp(argv[0], INTERNAL_LS) == 0) { 1000 isls = 1; 1001 stderrfd = -1; 1002 } else { 1003 (void)snprintf(temp, sizeof(temp), "%s", TMPFILE); 1004 stderrfd = mkstemp(temp); 1005 if (stderrfd != -1) 1006 (void)unlink(temp); 1007 } 1008 dispname = argv[0]; 1009 fin = ftpd_popen(argv, "r", stderrfd); 1010 closefunc = ftpd_pclose; 1011 st.st_size = -1; 1012 st.st_blksize = BUFSIZ; 1013 } 1014 if (fin == NULL) { 1015 if (errno != 0) { 1016 perror_reply(550, dispname); 1017 if (log) 1018 logcmd("get", -1, name, NULL, NULL, 1019 strerror(errno)); 1020 } 1021 goto cleanupretrieve; 1022 } 1023 byte_count = -1; 1024 if (argv == NULL 1025 && (fstat(fileno(fin), &st) < 0 || !S_ISREG(st.st_mode))) { 1026 reply(550, "%s: not a plain file.", dispname); 1027 goto done; 1028 } 1029 if (restart_point) { 1030 if (type == TYPE_A) { 1031 off_t i; 1032 int c; 1033 1034 for (i = 0; i < restart_point; i++) { 1035 if ((c=getc(fin)) == EOF) { 1036 perror_reply(550, dispname); 1037 goto done; 1038 } 1039 if (c == '\n') 1040 i++; 1041 } 1042 } else if (lseek(fileno(fin), restart_point, SEEK_SET) < 0) { 1043 perror_reply(550, dispname); 1044 goto done; 1045 } 1046 } 1047 dout = dataconn(dispname, st.st_size, "w"); 1048 if (dout == NULL) 1049 goto done; 1050 1051 (void)gettimeofday(&start, NULL); 1052 sendrv = send_data(fin, dout, st.st_blksize, isdata); 1053 (void)gettimeofday(&finish, NULL); 1054 (void) fclose(dout); 1055 timersub(&finish, &start, &td); 1056 tdp = &td; 1057 data = -1; 1058 pdata = -1; 1059 done: 1060 if (log) 1061 logcmd("get", byte_count, name, NULL, tdp, NULL); 1062 closerv = (*closefunc)(fin); 1063 if (sendrv == 0) { 1064 FILE *err; 1065 struct stat sb; 1066 1067 if (!isls && argv != NULL && closerv != 0) { 1068 lreply(226, 1069 "Command returned an exit status of %d", 1070 closerv); 1071 if (isconversion) 1072 syslog(LOG_INFO, 1073 "retrieve command: '%s' returned %d", 1074 argv[0], closerv); 1075 } 1076 if (!isls && argv != NULL && stderrfd != -1 && 1077 (fstat(stderrfd, &sb) == 0) && sb.st_size > 0 && 1078 ((err = fdopen(stderrfd, "r")) != NULL)) { 1079 char *cp, line[LINE_MAX]; 1080 1081 lreply(226, "Command error messages:"); 1082 rewind(err); 1083 while (fgets(line, sizeof(line), err) != NULL) { 1084 if ((cp = strchr(line, '\n')) != NULL) 1085 *cp = '\0'; 1086 lreply(0, " %s", line); 1087 } 1088 (void) fflush(stdout); 1089 (void) fclose(err); 1090 /* a reply(226,) must follow */ 1091 } 1092 reply(226, "Transfer complete."); 1093 } 1094 cleanupretrieve: 1095 if (stderrfd != -1) 1096 (void)close(stderrfd); 1097 if (isconversion) 1098 free(argv); 1099 } 1100 1101 void 1102 store(name, mode, unique) 1103 const char *name, *mode; 1104 int unique; 1105 { 1106 FILE *fout, *din; 1107 struct stat st; 1108 int (*closefunc) __P((FILE *)); 1109 struct timeval start, finish, td, *tdp; 1110 char *desc; 1111 1112 desc = (*mode == 'w') ? "put" : "append"; 1113 if (unique && stat(name, &st) == 0 && 1114 (name = gunique(name)) == NULL) { 1115 logcmd(desc, -1, name, NULL, NULL, "cannot create unique file"); 1116 return; 1117 } 1118 1119 if (restart_point) 1120 mode = "r+"; 1121 fout = fopen(name, mode); 1122 closefunc = fclose; 1123 tdp = NULL; 1124 if (fout == NULL) { 1125 perror_reply(553, name); 1126 logcmd(desc, -1, name, NULL, NULL, strerror(errno)); 1127 return; 1128 } 1129 byte_count = -1; 1130 if (restart_point) { 1131 if (type == TYPE_A) { 1132 off_t i; 1133 int c; 1134 1135 for (i = 0; i < restart_point; i++) { 1136 if ((c=getc(fout)) == EOF) { 1137 perror_reply(550, name); 1138 goto done; 1139 } 1140 if (c == '\n') 1141 i++; 1142 } 1143 /* 1144 * We must do this seek to "current" position 1145 * because we are changing from reading to 1146 * writing. 1147 */ 1148 if (fseek(fout, 0L, SEEK_CUR) < 0) { 1149 perror_reply(550, name); 1150 goto done; 1151 } 1152 } else if (lseek(fileno(fout), restart_point, SEEK_SET) < 0) { 1153 perror_reply(550, name); 1154 goto done; 1155 } 1156 } 1157 din = dataconn(name, (off_t)-1, "r"); 1158 if (din == NULL) 1159 goto done; 1160 (void)gettimeofday(&start, NULL); 1161 if (receive_data(din, fout) == 0) { 1162 if (unique) 1163 reply(226, "Transfer complete (unique file name:%s).", 1164 name); 1165 else 1166 reply(226, "Transfer complete."); 1167 } 1168 (void)gettimeofday(&finish, NULL); 1169 (void) fclose(din); 1170 timersub(&finish, &start, &td); 1171 tdp = &td; 1172 data = -1; 1173 pdata = -1; 1174 done: 1175 logcmd(desc, byte_count, name, NULL, tdp, NULL); 1176 (*closefunc)(fout); 1177 } 1178 1179 static FILE * 1180 getdatasock(mode) 1181 const char *mode; 1182 { 1183 int on = 1, s, t, tries; 1184 1185 if (data >= 0) 1186 return (fdopen(data, mode)); 1187 (void) seteuid((uid_t)0); 1188 s = socket(ctrl_addr.su_family, SOCK_STREAM, 0); 1189 if (s < 0) 1190 goto bad; 1191 if (setsockopt(s, SOL_SOCKET, SO_REUSEADDR, 1192 (char *) &on, sizeof(on)) < 0) 1193 goto bad; 1194 if (setsockopt(s, SOL_SOCKET, SO_KEEPALIVE, 1195 (char *) &on, sizeof(on)) < 0) 1196 goto bad; 1197 /* anchor socket to avoid multi-homing problems */ 1198 data_source = ctrl_addr; 1199 data_source.su_port = htons(20); /* ftp-data port */ 1200 for (tries = 1; ; tries++) { 1201 if (bind(s, (struct sockaddr *)&data_source, 1202 data_source.su_len) >= 0) 1203 break; 1204 if (errno != EADDRINUSE || tries > 10) 1205 goto bad; 1206 sleep(tries); 1207 } 1208 (void) seteuid((uid_t)pw->pw_uid); 1209 #ifdef IP_TOS 1210 if (!mapped && ctrl_addr.su_family == AF_INET) { 1211 on = IPTOS_THROUGHPUT; 1212 if (setsockopt(s, IPPROTO_IP, IP_TOS, (char *)&on, 1213 sizeof(int)) < 0) 1214 syslog(LOG_WARNING, "setsockopt (IP_TOS): %m"); 1215 } 1216 #endif 1217 return (fdopen(s, mode)); 1218 bad: 1219 /* Return the real value of errno (close may change it) */ 1220 t = errno; 1221 (void) seteuid((uid_t)pw->pw_uid); 1222 (void) close(s); 1223 errno = t; 1224 return (NULL); 1225 } 1226 1227 static FILE * 1228 dataconn(name, size, mode) 1229 const char *name; 1230 off_t size; 1231 const char *mode; 1232 { 1233 char sizebuf[32]; 1234 FILE *file; 1235 int retry = 0, tos, keepalive; 1236 1237 file_size = size; 1238 byte_count = 0; 1239 if (size != (off_t) -1) 1240 (void)snprintf(sizebuf, sizeof(sizebuf), " (%qd byte%s)", 1241 (qdfmt_t)size, PLURAL(size)); 1242 else 1243 sizebuf[0] = '\0'; 1244 if (pdata >= 0) { 1245 union sockunion from; 1246 int s, fromlen = sizeof(from); 1247 1248 (void) alarm(curclass.timeout); 1249 s = accept(pdata, (struct sockaddr *)&from, &fromlen); 1250 (void) alarm(0); 1251 if (s < 0) { 1252 reply(425, "Can't open data connection."); 1253 (void) close(pdata); 1254 pdata = -1; 1255 return (NULL); 1256 } 1257 (void) close(pdata); 1258 pdata = s; 1259 switch (from.su_family) { 1260 case AF_INET: 1261 #ifdef IP_TOS 1262 if (!mapped) { 1263 tos = IPTOS_THROUGHPUT; 1264 (void) setsockopt(s, IPPROTO_IP, IP_TOS, 1265 (char *)&tos, sizeof(int)); 1266 } 1267 break; 1268 #endif 1269 } 1270 /* Set keepalives on the socket to detect dropped conns. */ 1271 #ifdef SO_KEEPALIVE 1272 keepalive = 1; 1273 (void) setsockopt(s, SOL_SOCKET, SO_KEEPALIVE, 1274 (char *)&keepalive, sizeof(int)); 1275 #endif 1276 reply(150, "Opening %s mode data connection for '%s'%s.", 1277 type == TYPE_A ? "ASCII" : "BINARY", name, sizebuf); 1278 return (fdopen(pdata, mode)); 1279 } 1280 if (data >= 0) { 1281 reply(125, "Using existing data connection for '%s'%s.", 1282 name, sizebuf); 1283 usedefault = 1; 1284 return (fdopen(data, mode)); 1285 } 1286 if (usedefault) 1287 data_dest = his_addr; 1288 usedefault = 1; 1289 file = getdatasock(mode); 1290 if (file == NULL) { 1291 char hbuf[INET6_ADDRSTRLEN]; 1292 char pbuf[10]; 1293 getnameinfo((struct sockaddr *)&data_source, data_source.su_len, 1294 hbuf, sizeof(hbuf), pbuf, sizeof(pbuf), 1295 NI_NUMERICHOST | NI_NUMERICSERV); 1296 reply(425, "Can't create data socket (%s,%s): %s.", 1297 hbuf, pbuf, strerror(errno)); 1298 return (NULL); 1299 } 1300 data = fileno(file); 1301 while (connect(data, (struct sockaddr *)&data_dest, 1302 data_dest.su_len) < 0) { 1303 if (errno == EADDRINUSE && retry < swaitmax) { 1304 sleep((unsigned) swaitint); 1305 retry += swaitint; 1306 continue; 1307 } 1308 perror_reply(425, "Can't build data connection"); 1309 (void) fclose(file); 1310 data = -1; 1311 return (NULL); 1312 } 1313 reply(150, "Opening %s mode data connection for '%s'%s.", 1314 type == TYPE_A ? "ASCII" : "BINARY", name, sizebuf); 1315 return (file); 1316 } 1317 1318 /* 1319 * Tranfer the contents of "instr" to "outstr" peer using the appropriate 1320 * encapsulation of the data subject * to Mode, Structure, and Type. 1321 * 1322 * NB: Form isn't handled. 1323 */ 1324 static int 1325 send_data(instr, outstr, blksize, isdata) 1326 FILE *instr, *outstr; 1327 off_t blksize; 1328 int isdata; 1329 { 1330 int c, filefd, netfd, rval; 1331 char *buf; 1332 1333 transflag = 1; 1334 rval = -1; 1335 buf = NULL; 1336 if (setjmp(urgcatch)) 1337 goto cleanup_send_data; 1338 1339 switch (type) { 1340 1341 case TYPE_A: 1342 /* XXXX: rate limit ascii send (get) */ 1343 (void) alarm(curclass.timeout); 1344 while ((c = getc(instr)) != EOF) { 1345 byte_count++; 1346 if (c == '\n') { 1347 if (ferror(outstr)) 1348 goto data_err; 1349 (void) putc('\r', outstr); 1350 if (isdata) { 1351 total_data_out++; 1352 total_data++; 1353 } 1354 total_bytes_out++; 1355 total_bytes++; 1356 } 1357 (void) putc(c, outstr); 1358 if (isdata) { 1359 total_data_out++; 1360 total_data++; 1361 } 1362 total_bytes_out++; 1363 total_bytes++; 1364 if ((byte_count % 4096) == 0) 1365 (void) alarm(curclass.timeout); 1366 } 1367 (void) alarm(0); 1368 fflush(outstr); 1369 if (ferror(instr)) 1370 goto file_err; 1371 if (ferror(outstr)) 1372 goto data_err; 1373 rval = 0; 1374 goto cleanup_send_data; 1375 1376 case TYPE_I: 1377 case TYPE_L: 1378 if ((buf = malloc((size_t)blksize)) == NULL) { 1379 perror_reply(451, "Local resource failure: malloc"); 1380 goto cleanup_send_data; 1381 } 1382 filefd = fileno(instr); 1383 netfd = fileno(outstr); 1384 (void) alarm(curclass.timeout); 1385 if (curclass.rateget) { 1386 while (1) { 1387 int d; 1388 struct timeval then, now, td; 1389 off_t bufrem; 1390 char *bufp; 1391 1392 (void)gettimeofday(&then, NULL); 1393 errno = c = d = 0; 1394 bufrem = curclass.rateget; 1395 while (bufrem > 0) { 1396 if ((c = read(filefd, buf, 1397 MIN(blksize, bufrem))) <= 0) 1398 goto senddone; 1399 (void) alarm(curclass.timeout); 1400 bufrem -= c; 1401 byte_count += c; 1402 if (isdata) { 1403 total_data_out += c; 1404 total_data += c; 1405 } 1406 total_bytes_out += c; 1407 total_bytes += c; 1408 for (bufp = buf; c > 0; 1409 c -= d, bufp += d) 1410 if ((d = 1411 write(netfd, bufp, c)) <= 0) 1412 break; 1413 if (d < 0) 1414 goto data_err; 1415 } 1416 (void)gettimeofday(&now, NULL); 1417 timersub(&now, &then, &td); 1418 if (td.tv_sec > 0) 1419 break; 1420 usleep(1000000 - td.tv_usec); 1421 } 1422 } else { 1423 while ((c = read(filefd, buf, (size_t)blksize)) > 0) { 1424 if (write(netfd, buf, c) != c) 1425 goto data_err; 1426 (void) alarm(curclass.timeout); 1427 byte_count += c; 1428 if (isdata) { 1429 total_data_out += c; 1430 total_data += c; 1431 } 1432 total_bytes_out += c; 1433 total_bytes += c; 1434 } 1435 } 1436 senddone: 1437 if (c < 0) 1438 goto file_err; 1439 rval = 0; 1440 goto cleanup_send_data; 1441 1442 default: 1443 reply(550, "Unimplemented TYPE %d in send_data", type); 1444 goto cleanup_send_data; 1445 } 1446 1447 data_err: 1448 (void) alarm(0); 1449 perror_reply(426, "Data connection"); 1450 goto cleanup_send_data; 1451 1452 file_err: 1453 (void) alarm(0); 1454 perror_reply(551, "Error on input file"); 1455 /* FALLTHROUGH */ 1456 1457 cleanup_send_data: 1458 (void) alarm(0); 1459 transflag = 0; 1460 if (buf) 1461 free(buf); 1462 if (isdata) { 1463 total_files_out++; 1464 total_files++; 1465 } 1466 total_xfers_out++; 1467 total_xfers++; 1468 return (rval); 1469 } 1470 1471 /* 1472 * Transfer data from peer to "outstr" using the appropriate encapulation of 1473 * the data subject to Mode, Structure, and Type. 1474 * 1475 * N.B.: Form isn't handled. 1476 */ 1477 static int 1478 receive_data(instr, outstr) 1479 FILE *instr, *outstr; 1480 { 1481 int c, bare_lfs, netfd, filefd, rval; 1482 char buf[BUFSIZ]; 1483 #ifdef __GNUC__ 1484 (void) &bare_lfs; 1485 #endif 1486 1487 bare_lfs = 0; 1488 transflag = 1; 1489 rval = -1; 1490 if (setjmp(urgcatch)) 1491 goto cleanup_recv_data; 1492 1493 switch (type) { 1494 1495 case TYPE_I: 1496 case TYPE_L: 1497 netfd = fileno(instr); 1498 filefd = fileno(outstr); 1499 (void) alarm(curclass.timeout); 1500 if (curclass.rateput) { 1501 while (1) { 1502 int d; 1503 struct timeval then, now, td; 1504 off_t bufrem; 1505 1506 (void)gettimeofday(&then, NULL); 1507 errno = c = d = 0; 1508 for (bufrem = curclass.rateput; bufrem > 0; ) { 1509 if ((c = read(netfd, buf, 1510 MIN(sizeof(buf), bufrem))) <= 0) 1511 goto recvdone; 1512 if ((d = write(filefd, buf, c)) != c) 1513 goto recvdone; 1514 (void) alarm(curclass.timeout); 1515 bufrem -= c; 1516 byte_count += c; 1517 total_data_in += c; 1518 total_data += c; 1519 total_bytes_in += c; 1520 total_bytes += c; 1521 } 1522 (void)gettimeofday(&now, NULL); 1523 timersub(&now, &then, &td); 1524 if (td.tv_sec > 0) 1525 break; 1526 usleep(1000000 - td.tv_usec); 1527 } 1528 } else { 1529 while ((c = read(netfd, buf, sizeof(buf))) > 0) { 1530 if (write(filefd, buf, c) != c) 1531 goto file_err; 1532 (void) alarm(curclass.timeout); 1533 byte_count += c; 1534 total_data_in += c; 1535 total_data += c; 1536 total_bytes_in += c; 1537 total_bytes += c; 1538 } 1539 } 1540 recvdone: 1541 if (c < 0) 1542 goto data_err; 1543 rval = 0; 1544 goto cleanup_recv_data; 1545 1546 case TYPE_E: 1547 reply(553, "TYPE E not implemented."); 1548 goto cleanup_recv_data; 1549 1550 case TYPE_A: 1551 (void) alarm(curclass.timeout); 1552 /* XXXX: rate limit ascii receive (put) */ 1553 while ((c = getc(instr)) != EOF) { 1554 byte_count++; 1555 total_data_in++; 1556 total_data++; 1557 total_bytes_in++; 1558 total_bytes++; 1559 if ((byte_count % 4096) == 0) 1560 (void) alarm(curclass.timeout); 1561 if (c == '\n') 1562 bare_lfs++; 1563 while (c == '\r') { 1564 if (ferror(outstr)) 1565 goto data_err; 1566 if ((c = getc(instr)) != '\n') { 1567 byte_count++; 1568 total_data_in++; 1569 total_data++; 1570 total_bytes_in++; 1571 total_bytes++; 1572 if ((byte_count % 4096) == 0) 1573 (void) alarm(curclass.timeout); 1574 (void) putc ('\r', outstr); 1575 if (c == '\0' || c == EOF) 1576 goto contin2; 1577 } 1578 } 1579 (void) putc(c, outstr); 1580 contin2: ; 1581 } 1582 (void) alarm(0); 1583 fflush(outstr); 1584 if (ferror(instr)) 1585 goto data_err; 1586 if (ferror(outstr)) 1587 goto file_err; 1588 if (bare_lfs) { 1589 lreply(226, 1590 "WARNING! %d bare linefeeds received in ASCII mode", 1591 bare_lfs); 1592 lreply(0, "File may not have transferred correctly."); 1593 } 1594 rval = 0; 1595 goto cleanup_recv_data; 1596 1597 default: 1598 reply(550, "Unimplemented TYPE %d in receive_data", type); 1599 goto cleanup_recv_data; 1600 } 1601 1602 data_err: 1603 (void) alarm(0); 1604 perror_reply(426, "Data Connection"); 1605 goto cleanup_recv_data; 1606 1607 file_err: 1608 (void) alarm(0); 1609 perror_reply(452, "Error writing file"); 1610 goto cleanup_recv_data; 1611 1612 cleanup_recv_data: 1613 (void) alarm(0); 1614 transflag = 0; 1615 total_files_in++; 1616 total_files++; 1617 total_xfers_in++; 1618 total_xfers++; 1619 return (rval); 1620 } 1621 1622 void 1623 statfilecmd(filename) 1624 const char *filename; 1625 { 1626 FILE *fin; 1627 int c; 1628 char *argv[] = { INTERNAL_LS, "-lgA", "", NULL }; 1629 1630 argv[2] = (char *)filename; 1631 fin = ftpd_popen(argv, "r", STDOUT_FILENO); 1632 lreply(211, "status of %s:", filename); 1633 while ((c = getc(fin)) != EOF) { 1634 if (c == '\n') { 1635 if (ferror(stdout)){ 1636 perror_reply(421, "control connection"); 1637 (void) ftpd_pclose(fin); 1638 dologout(1); 1639 /* NOTREACHED */ 1640 } 1641 if (ferror(fin)) { 1642 perror_reply(551, filename); 1643 (void) ftpd_pclose(fin); 1644 return; 1645 } 1646 (void) putchar('\r'); 1647 total_bytes++; 1648 total_bytes_out++; 1649 } 1650 (void) putchar(c); 1651 total_bytes++; 1652 total_bytes_out++; 1653 } 1654 (void) ftpd_pclose(fin); 1655 reply(211, "End of Status"); 1656 } 1657 1658 void 1659 statcmd() 1660 { 1661 union sockunion *su = NULL; 1662 static char ntop_buf[INET6_ADDRSTRLEN]; 1663 u_char *a, *p; 1664 int ispassive; 1665 off_t b, otbi, otbo, otb; 1666 1667 a = p = (u_char *)NULL; 1668 1669 lreply(211, "%s FTP server status:", hostname); 1670 lreply(0, "%s", version); 1671 ntop_buf[0] = '\0'; 1672 if (!getnameinfo((struct sockaddr *)&his_addr, his_addr.su_len, 1673 ntop_buf, sizeof(ntop_buf), NULL, 0, NI_NUMERICHOST) 1674 && strcmp(remotehost, ntop_buf) != 0) { 1675 lreply(0, "Connected to %s (%s)", remotehost, ntop_buf); 1676 } else 1677 lreply(0, "Connected to %s", remotehost); 1678 if (logged_in) { 1679 if (curclass.type == CLASS_GUEST) 1680 lreply(0, "Logged in anonymously"); 1681 else 1682 lreply(0, "Logged in as %s%s", pw->pw_name, 1683 curclass.type == CLASS_CHROOT ? " (chroot)" : ""); 1684 } else if (askpasswd) 1685 lreply(0, "Waiting for password"); 1686 else 1687 lreply(0, "Waiting for user name"); 1688 b = printf(" TYPE: %s", typenames[type]); 1689 total_bytes += b; 1690 total_bytes_out += b; 1691 if (type == TYPE_A || type == TYPE_E) { 1692 b = printf(", FORM: %s", formnames[form]); 1693 total_bytes += b; 1694 total_bytes_out += b; 1695 } 1696 if (type == TYPE_L) { 1697 #if NBBY == 8 1698 b = printf(" %d", NBBY); 1699 #else 1700 /* XXX: `bytesize' needs to be defined in this case */ 1701 b = printf(" %d", bytesize); 1702 #endif 1703 total_bytes += b; 1704 total_bytes_out += b; 1705 } 1706 b = printf("; STRUcture: %s; transfer MODE: %s\r\n", 1707 strunames[stru], modenames[mode]); 1708 total_bytes += b; 1709 total_bytes_out += b; 1710 ispassive = 0; 1711 if (data != -1) { 1712 lreply(0, "Data connection open"); 1713 su = NULL; 1714 } else if (pdata != -1) { 1715 b = printf(" in Passive mode"); 1716 total_bytes += b; 1717 total_bytes_out += b; 1718 su = (union sockunion *)&pasv_addr; 1719 ispassive = 1; 1720 goto printaddr; 1721 } else if (usedefault == 0) { 1722 if (epsvall) { 1723 b = printf("211- EPSV only mode (EPSV ALL )\r\n"); 1724 total_bytes += b; 1725 total_bytes_out += b; 1726 goto epsvonly; 1727 } 1728 b = printf("211- %s", 1729 (data_dest.su_family == AF_INET) ? "PORT" : "LPRT"); 1730 total_bytes += b; 1731 total_bytes_out += b; 1732 su = (union sockunion *)&data_dest; 1733 printaddr: 1734 /* PASV/PORT */ 1735 if (su->su_family == AF_INET) { 1736 if (ispassive) 1737 b = printf("211- PASV "); 1738 else 1739 b = printf("211- PORT "); 1740 a = (u_char *) &su->su_sin.sin_addr; 1741 p = (u_char *) &su->su_sin.sin_port; 1742 #define UC(b) (((int) b) & 0xff) 1743 b += printf("(%d,%d,%d,%d,%d,%d)\r\n", 1744 UC(a[0]), UC(a[1]), UC(a[2]), UC(a[3]), 1745 UC(p[0]), UC(p[1])); 1746 total_bytes += b; 1747 total_bytes_out += b; 1748 } 1749 1750 /* LPSV/LPRT */ 1751 { 1752 int alen, af, i; 1753 1754 alen = 0; 1755 switch (su->su_family) { 1756 case AF_INET: 1757 a = (u_char *) &su->su_sin.sin_addr; 1758 p = (u_char *) &su->su_sin.sin_port; 1759 alen = sizeof(su->su_sin.sin_addr); 1760 af = 4; 1761 break; 1762 case AF_INET6: 1763 a = (u_char *) &su->su_sin6.sin6_addr; 1764 p = (u_char *) &su->su_sin6.sin6_port; 1765 alen = sizeof(su->su_sin6.sin6_addr); 1766 af = 6; 1767 break; 1768 default: 1769 af = 0; 1770 break; 1771 } 1772 if (af) { 1773 if (ispassive) 1774 b = printf("211- LPSV "); 1775 else 1776 b = printf("211- LPRT "); 1777 printf("(%d,%d", af, alen); 1778 for (i = 0; i < alen; i++) 1779 b += printf("%d,", UC(a[alen])); 1780 b += printf("%d,%d,%d)\r\n", 2, UC(p[0]), UC(p[1])); 1781 total_bytes += b; 1782 total_bytes_out += b; 1783 #undef UC 1784 } 1785 } 1786 1787 /* EPRT/EPSV */ 1788 epsvonly:; 1789 { 1790 int af; 1791 1792 switch (su->su_family) { 1793 case AF_INET: 1794 af = 1; 1795 break; 1796 case AF_INET6: 1797 af = 2; 1798 break; 1799 default: 1800 af = 0; 1801 break; 1802 } 1803 if (af) { 1804 if (getnameinfo((struct sockaddr *)su, su->su_len, 1805 ntop_buf, sizeof(ntop_buf), NULL, 0, 1806 NI_NUMERICHOST) == 0) { 1807 if (ispassive) 1808 b = printf("211 - EPSV "); 1809 else 1810 b = printf("211 - EPRT "); 1811 b += printf("(|%d|%s|%d|)\r\n", 1812 af, ntop_buf, ntohs(su->su_port)); 1813 total_bytes += b; 1814 total_bytes_out += b; 1815 } 1816 } 1817 } 1818 } else 1819 lreply(0, "No data connection"); 1820 1821 if (logged_in) { 1822 lreply(0, "Data sent: %qd byte%s in %qd file%s", 1823 (qdfmt_t)total_data_out, PLURAL(total_data_out), 1824 (qdfmt_t)total_files_out, PLURAL(total_files_out)); 1825 lreply(0, "Data received: %qd byte%s in %qd file%s", 1826 (qdfmt_t)total_data_in, PLURAL(total_data_in), 1827 (qdfmt_t)total_files_in, PLURAL(total_files_in)); 1828 lreply(0, "Total data: %qd byte%s in %qd file%s", 1829 (qdfmt_t)total_data, PLURAL(total_data), 1830 (qdfmt_t)total_files, PLURAL(total_files)); 1831 } 1832 otbi = total_bytes_in; 1833 otbo = total_bytes_out; 1834 otb = total_bytes; 1835 lreply(0, "Traffic sent: %qd byte%s in %qd transfer%s", 1836 (qdfmt_t)otbo, PLURAL(otbo), 1837 (qdfmt_t)total_xfers_out, PLURAL(total_xfers_out)); 1838 lreply(0, "Traffic received: %qd byte%s in %qd transfer%s", 1839 (qdfmt_t)otbi, PLURAL(otbi), 1840 (qdfmt_t)total_xfers_in, PLURAL(total_xfers_in)); 1841 lreply(0, "Total traffic: %qd byte%s in %qd transfer%s", 1842 (qdfmt_t)otb, PLURAL(otb), 1843 (qdfmt_t)total_xfers, PLURAL(total_xfers)); 1844 1845 if (logged_in) { 1846 struct ftpconv *cp; 1847 1848 lreply(0, ""); 1849 lreply(0, "Class: %s, class type: %s", curclass.classname, 1850 curclass.type == CLASS_GUEST ? "GUEST" : 1851 curclass.type == CLASS_CHROOT ? "CHROOT" : 1852 curclass.type == CLASS_REAL ? "REAL" : "<unknown>"); 1853 lreply(0, "Check PORT/LPRT commands: %sabled", 1854 curclass.checkportcmd ? "en" : "dis"); 1855 if (curclass.display != NULL) 1856 lreply(0, "Display file: %s", curclass.display); 1857 if (curclass.notify != NULL) 1858 lreply(0, "Notify fileglob: %s", curclass.notify); 1859 lreply(0, "Idle timeout: %d, maximum timeout: %d", 1860 curclass.timeout, curclass.maxtimeout); 1861 if (curclass.motd != NULL) 1862 lreply(0, "MotD file: %s", curclass.motd); 1863 lreply(0, 1864 "Modify commands (CHMOD, DELE, MKD, RMD, RNFR, UMASK): %sabled", 1865 curclass.modify ? "en" : "dis"); 1866 lreply(0, 1867 "Upload commands (APPE, STOR, STOU): %sabled", 1868 curclass.upload ? "en" : "dis"); 1869 if (curclass.rateget) 1870 lreply(0, "Rate get limit: %d bytes/sec", 1871 curclass.rateget); 1872 else 1873 lreply(0, "Rate get limit: disabled"); 1874 if (curclass.rateput) 1875 lreply(0, "Rate put limit: %d bytes/sec", 1876 curclass.rateput); 1877 else 1878 lreply(0, "Rate put limit: disabled"); 1879 lreply(0, "Umask: %.04o", curclass.umask); 1880 for (cp = curclass.conversions; cp != NULL; cp=cp->next) { 1881 if (cp->suffix == NULL || cp->types == NULL || 1882 cp->command == NULL) 1883 continue; 1884 lreply(0, 1885 "Conversion: %s [%s] disable: %s, command: %s", 1886 cp->suffix, cp->types, cp->disable, cp->command); 1887 } 1888 } 1889 1890 reply(211, "End of status"); 1891 } 1892 1893 void 1894 fatal(s) 1895 const char *s; 1896 { 1897 1898 reply(451, "Error in server: %s\n", s); 1899 reply(221, "Closing connection due to server error."); 1900 dologout(0); 1901 /* NOTREACHED */ 1902 } 1903 1904 void 1905 #ifdef __STDC__ 1906 reply(int n, const char *fmt, ...) 1907 #else 1908 reply(n, fmt, va_alist) 1909 int n; 1910 char *fmt; 1911 va_dcl 1912 #endif 1913 { 1914 off_t b; 1915 va_list ap; 1916 #ifdef __STDC__ 1917 va_start(ap, fmt); 1918 #else 1919 va_start(ap); 1920 #endif 1921 b = 0; 1922 b += printf("%d ", n); 1923 b += vprintf(fmt, ap); 1924 b += printf("\r\n"); 1925 total_bytes += b; 1926 total_bytes_out += b; 1927 (void)fflush(stdout); 1928 if (debug) { 1929 syslog(LOG_DEBUG, "<--- %d ", n); 1930 vsyslog(LOG_DEBUG, fmt, ap); 1931 } 1932 } 1933 1934 void 1935 #ifdef __STDC__ 1936 lreply(int n, const char *fmt, ...) 1937 #else 1938 lreply(n, fmt, va_alist) 1939 int n; 1940 char *fmt; 1941 va_dcl 1942 #endif 1943 { 1944 off_t b; 1945 va_list ap; 1946 #ifdef __STDC__ 1947 va_start(ap, fmt); 1948 #else 1949 va_start(ap); 1950 #endif 1951 b = 0; 1952 switch (n) { 1953 case 0: 1954 b += printf(" "); 1955 case -1: 1956 break; 1957 default: 1958 b += printf("%d-", n); 1959 break; 1960 } 1961 b += vprintf(fmt, ap); 1962 b += printf("\r\n"); 1963 total_bytes += b; 1964 total_bytes_out += b; 1965 (void)fflush(stdout); 1966 if (debug) { 1967 syslog(LOG_DEBUG, "<--- %d- ", n); 1968 vsyslog(LOG_DEBUG, fmt, ap); 1969 } 1970 } 1971 1972 static void 1973 ack(s) 1974 const char *s; 1975 { 1976 1977 reply(250, "%s command successful.", s); 1978 } 1979 1980 void 1981 delete(name) 1982 const char *name; 1983 { 1984 char *p = NULL; 1985 1986 if (remove(name) < 0) { 1987 p = strerror(errno); 1988 perror_reply(550, name); 1989 } else 1990 ack("DELE"); 1991 logcmd("delete", -1, name, NULL, NULL, p); 1992 } 1993 1994 void 1995 cwd(path) 1996 const char *path; 1997 { 1998 1999 if (chdir(path) < 0) 2000 perror_reply(550, path); 2001 else { 2002 show_chdir_messages(250); 2003 ack("CWD"); 2004 } 2005 } 2006 2007 static void 2008 replydirname(name, message) 2009 const char *name, *message; 2010 { 2011 char npath[MAXPATHLEN + 1]; 2012 int i; 2013 2014 for (i = 0; *name != '\0' && i < sizeof(npath) - 1; i++, name++) { 2015 npath[i] = *name; 2016 if (*name == '"') 2017 npath[++i] = '"'; 2018 } 2019 npath[i] = '\0'; 2020 reply(257, "\"%s\" %s", npath, message); 2021 } 2022 2023 void 2024 makedir(name) 2025 const char *name; 2026 { 2027 char *p = NULL; 2028 2029 if (mkdir(name, 0777) < 0) { 2030 p = strerror(errno); 2031 perror_reply(550, name); 2032 } else 2033 replydirname(name, "directory created."); 2034 logcmd("mkdir", -1, name, NULL, NULL, p); 2035 } 2036 2037 void 2038 removedir(name) 2039 const char *name; 2040 { 2041 char *p = NULL; 2042 2043 if (rmdir(name) < 0) { 2044 p = strerror(errno); 2045 perror_reply(550, name); 2046 } else 2047 ack("RMD"); 2048 logcmd("rmdir", -1, name, NULL, NULL, p); 2049 } 2050 2051 void 2052 pwd() 2053 { 2054 char path[MAXPATHLEN + 1]; 2055 2056 if (getcwd(path, sizeof(path) - 1) == NULL) 2057 reply(550, "Can't get the current directory: %s.", 2058 strerror(errno)); 2059 else 2060 replydirname(path, "is the current directory."); 2061 } 2062 2063 char * 2064 renamefrom(name) 2065 char *name; 2066 { 2067 struct stat st; 2068 2069 if (stat(name, &st) < 0) { 2070 perror_reply(550, name); 2071 return (NULL); 2072 } 2073 reply(350, "File exists, ready for destination name"); 2074 return (xstrdup(name)); 2075 } 2076 2077 void 2078 renamecmd(from, to) 2079 const char *from, *to; 2080 { 2081 char *p = NULL; 2082 2083 if (rename(from, to) < 0) { 2084 p = strerror(errno); 2085 perror_reply(550, "rename"); 2086 } else 2087 ack("RNTO"); 2088 logcmd("rename", -1, from, to, NULL, p); 2089 } 2090 2091 static void 2092 dolog(who) 2093 struct sockaddr *who; 2094 { 2095 getnameinfo(who, who->sa_len, remotehost, sizeof(remotehost), NULL,0,0); 2096 #ifdef HASSETPROCTITLE 2097 snprintf(proctitle, sizeof(proctitle), "%s: connected", remotehost); 2098 setproctitle(proctitle); 2099 #endif /* HASSETPROCTITLE */ 2100 if (logging) 2101 syslog(LOG_INFO, "connection from %s to %s", 2102 remotehost, hostname); 2103 } 2104 2105 /* 2106 * Record logout in wtmp file 2107 * and exit with supplied status. 2108 */ 2109 void 2110 dologout(status) 2111 int status; 2112 { 2113 /* 2114 * Prevent reception of SIGURG from resulting in a resumption 2115 * back to the main program loop. 2116 */ 2117 transflag = 0; 2118 2119 if (logged_in) { 2120 (void) seteuid((uid_t)0); 2121 logwtmp(ttyline, "", ""); 2122 if (doutmp) 2123 logout(utmp.ut_line); 2124 #ifdef KERBEROS 2125 if (!notickets && krbtkfile_env) 2126 unlink(krbtkfile_env); 2127 #endif 2128 } 2129 /* beware of flushing buffers after a SIGPIPE */ 2130 _exit(status); 2131 } 2132 2133 static void 2134 myoob(signo) 2135 int signo; 2136 { 2137 char *cp; 2138 2139 /* only process if transfer occurring */ 2140 if (!transflag) 2141 return; 2142 cp = tmpline; 2143 if (getline(cp, 7, stdin) == NULL) { 2144 reply(221, "You could at least say goodbye."); 2145 dologout(0); 2146 } 2147 if (strcasecmp(cp, "ABOR\r\n") == 0) { 2148 tmpline[0] = '\0'; 2149 reply(426, "Transfer aborted. Data connection closed."); 2150 reply(226, "Abort successful"); 2151 longjmp(urgcatch, 1); 2152 } 2153 if (strcasecmp(cp, "STAT\r\n") == 0) { 2154 tmpline[0] = '\0'; 2155 if (file_size != (off_t) -1) 2156 reply(213, "Status: %qd of %qd byte%s transferred", 2157 (qdfmt_t)byte_count, (qdfmt_t)file_size, 2158 PLURAL(byte_count)); 2159 else 2160 reply(213, "Status: %qd byte%s transferred", 2161 (qdfmt_t)byte_count, PLURAL(byte_count)); 2162 } 2163 } 2164 2165 /* 2166 * Note: a response of 425 is not mentioned as a possible response to 2167 * the PASV command in RFC959. However, it has been blessed as 2168 * a legitimate response by Jon Postel in a telephone conversation 2169 * with Rick Adams on 25 Jan 89. 2170 */ 2171 void 2172 passive() 2173 { 2174 int len; 2175 char *p, *a; 2176 2177 if (pdata >= 0) 2178 close(pdata); 2179 pdata = socket(AF_INET, SOCK_STREAM, 0); 2180 if (pdata < 0 || !logged_in) { 2181 perror_reply(425, "Can't open passive connection"); 2182 return; 2183 } 2184 pasv_addr = ctrl_addr; 2185 pasv_addr.su_port = 0; 2186 len = pasv_addr.su_len; 2187 if (bind(pdata, (struct sockaddr *)&pasv_addr, len) < 0) { 2188 goto pasv_error; 2189 } 2190 if (getsockname(pdata, (struct sockaddr *) &pasv_addr, &len) < 0) 2191 goto pasv_error; 2192 if (listen(pdata, 1) < 0) 2193 goto pasv_error; 2194 a = (char *) &pasv_addr.su_sin.sin_addr; 2195 p = (char *) &pasv_addr.su_port; 2196 2197 #define UC(b) (((int) b) & 0xff) 2198 2199 reply(227, "Entering Passive Mode (%d,%d,%d,%d,%d,%d)", UC(a[0]), 2200 UC(a[1]), UC(a[2]), UC(a[3]), UC(p[0]), UC(p[1])); 2201 return; 2202 2203 pasv_error: 2204 (void) close(pdata); 2205 pdata = -1; 2206 perror_reply(425, "Can't open passive connection"); 2207 return; 2208 } 2209 2210 /* 2211 * 228 Entering Long Passive Mode (af, hal, h1, h2, h3,..., pal, p1, p2...) 2212 * 229 Entering Extended Passive Mode (|||port|) 2213 */ 2214 void 2215 long_passive(char *cmd, int pf) 2216 { 2217 int len; 2218 register char *p, *a; 2219 2220 if (!logged_in) { 2221 syslog(LOG_NOTICE, "long passive but not logged in"); 2222 reply(503, "Login with USER first."); 2223 return; 2224 } 2225 2226 if (pf != PF_UNSPEC) { 2227 if (ctrl_addr.su_family != pf) { 2228 switch (ctrl_addr.su_family) { 2229 case AF_INET: 2230 pf = 1; 2231 break; 2232 case AF_INET6: 2233 pf = 2; 2234 break; 2235 default: 2236 pf = 0; 2237 break; 2238 } 2239 /* 2240 * XXX 2241 * only EPRT/EPSV ready clients will understand this 2242 */ 2243 if (strcmp(cmd, "EPSV") == 0 && pf) { 2244 reply(522, "Network protocol mismatch, " 2245 "use (%d)", pf); 2246 } else 2247 reply(501, "Network protocol mismatch"); /*XXX*/ 2248 2249 return; 2250 } 2251 } 2252 2253 if (pdata >= 0) 2254 close(pdata); 2255 pdata = socket(ctrl_addr.su_family, SOCK_STREAM, 0); 2256 if (pdata < 0) { 2257 perror_reply(425, "Can't open passive connection"); 2258 return; 2259 } 2260 pasv_addr = ctrl_addr; 2261 pasv_addr.su_port = 0; 2262 if (bind(pdata, (struct sockaddr *) &pasv_addr, pasv_addr.su_len) < 0) { 2263 goto pasv_error; 2264 } 2265 len = pasv_addr.su_len; 2266 if (getsockname(pdata, (struct sockaddr *) &pasv_addr, &len) < 0) 2267 goto pasv_error; 2268 if (listen(pdata, 1) < 0) 2269 goto pasv_error; 2270 p = (char *) &pasv_addr.su_port; 2271 2272 #define UC(b) (((int) b) & 0xff) 2273 2274 if (strcmp(cmd, "LPSV") == 0) { 2275 switch (pasv_addr.su_family) { 2276 case AF_INET: 2277 a = (char *) &pasv_addr.su_sin.sin_addr; 2278 reply(228, "Entering Long Passive Mode (%d,%d,%d,%d,%d,%d,%d,%d,%d)", 2279 4, 4, UC(a[0]), UC(a[1]), UC(a[2]), UC(a[3]), 2280 2, UC(p[0]), UC(p[1])); 2281 return; 2282 case AF_INET6: 2283 a = (char *) &pasv_addr.su_sin6.sin6_addr; 2284 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)", 2285 6, 16, 2286 UC(a[0]), UC(a[1]), UC(a[2]), UC(a[3]), 2287 UC(a[4]), UC(a[5]), UC(a[6]), UC(a[7]), 2288 UC(a[8]), UC(a[9]), UC(a[10]), UC(a[11]), 2289 UC(a[12]), UC(a[13]), UC(a[14]), UC(a[15]), 2290 2, UC(p[0]), UC(p[1])); 2291 return; 2292 } 2293 #undef UC 2294 } else if (strcmp(cmd, "EPSV") == 0) { 2295 switch (pasv_addr.su_family) { 2296 case AF_INET: 2297 case AF_INET6: 2298 reply(229, "Entering Extended Passive Mode (|||%d|)", 2299 ntohs(pasv_addr.su_port)); 2300 return; 2301 } 2302 } else { 2303 /* more proper error code? */ 2304 } 2305 2306 pasv_error: 2307 (void) close(pdata); 2308 pdata = -1; 2309 perror_reply(425, "Can't open passive connection"); 2310 return; 2311 } 2312 2313 /* 2314 * Generate unique name for file with basename "local". 2315 * The file named "local" is already known to exist. 2316 * Generates failure reply on error. 2317 * 2318 * XXX this function should under go changes similar to 2319 * the mktemp(3)/mkstemp(3) changes. 2320 */ 2321 static char * 2322 gunique(local) 2323 const char *local; 2324 { 2325 static char new[MAXPATHLEN + 1]; 2326 struct stat st; 2327 char *cp; 2328 int count; 2329 2330 cp = strrchr(local, '/'); 2331 if (cp) 2332 *cp = '\0'; 2333 if (stat(cp ? local : ".", &st) < 0) { 2334 perror_reply(553, cp ? local : "."); 2335 return (NULL); 2336 } 2337 if (cp) 2338 *cp = '/'; 2339 for (count = 1; count < 100; count++) { 2340 (void)snprintf(new, sizeof(new) - 1, "%s.%d", local, count); 2341 if (stat(new, &st) < 0) 2342 return (new); 2343 } 2344 reply(452, "Unique file name cannot be created."); 2345 return (NULL); 2346 } 2347 2348 /* 2349 * Format and send reply containing system error number. 2350 */ 2351 void 2352 perror_reply(code, string) 2353 int code; 2354 const char *string; 2355 { 2356 int save_errno; 2357 2358 save_errno = errno; 2359 reply(code, "%s: %s.", string, strerror(errno)); 2360 errno = save_errno; 2361 } 2362 2363 static char *onefile[] = { 2364 "", 2365 0 2366 }; 2367 2368 void 2369 send_file_list(whichf) 2370 const char *whichf; 2371 { 2372 struct stat st; 2373 DIR *dirp = NULL; 2374 struct dirent *dir; 2375 FILE *dout = NULL; 2376 char **dirlist, *dirname, *p; 2377 int simple = 0; 2378 int freeglob = 0; 2379 glob_t gl; 2380 off_t b; 2381 2382 #ifdef __GNUC__ 2383 (void) &dout; 2384 (void) &dirlist; 2385 (void) &simple; 2386 (void) &freeglob; 2387 #endif 2388 2389 p = NULL; 2390 if (strpbrk(whichf, "~{[*?") != NULL) { 2391 int flags = GLOB_BRACE|GLOB_NOCHECK|GLOB_TILDE; 2392 2393 memset(&gl, 0, sizeof(gl)); 2394 freeglob = 1; 2395 if (glob(whichf, flags, 0, &gl)) { 2396 reply(550, "not found"); 2397 goto out; 2398 } else if (gl.gl_pathc == 0) { 2399 errno = ENOENT; 2400 perror_reply(550, whichf); 2401 goto out; 2402 } 2403 dirlist = gl.gl_pathv; 2404 } else { 2405 p = xstrdup(whichf); 2406 onefile[0] = p; 2407 dirlist = onefile; 2408 simple = 1; 2409 } 2410 /* XXX: } for vi sm */ 2411 2412 if (setjmp(urgcatch)) { 2413 transflag = 0; 2414 goto out; 2415 } 2416 while ((dirname = *dirlist++) != NULL) { 2417 int trailingslash = 0; 2418 2419 if (stat(dirname, &st) < 0) { 2420 /* 2421 * If user typed "ls -l", etc, and the client 2422 * used NLST, do what the user meant. 2423 */ 2424 /* XXX: nuke this support? */ 2425 if (dirname[0] == '-' && *dirlist == NULL && 2426 transflag == 0) { 2427 char *argv[] = { INTERNAL_LS, "", NULL }; 2428 2429 argv[1] = dirname; 2430 retrieve(argv, dirname); 2431 goto out; 2432 } 2433 perror_reply(550, whichf); 2434 if (dout != NULL) { 2435 (void) fclose(dout); 2436 transflag = 0; 2437 data = -1; 2438 pdata = -1; 2439 } 2440 goto out; 2441 } 2442 2443 if (S_ISREG(st.st_mode)) { 2444 if (dout == NULL) { 2445 dout = dataconn("file list", (off_t)-1, "w"); 2446 if (dout == NULL) 2447 goto out; 2448 transflag++; 2449 } 2450 b = fprintf(dout, "%s%s\n", dirname, 2451 type == TYPE_A ? "\r" : ""); 2452 total_bytes += b; 2453 total_bytes_out += b; 2454 byte_count += strlen(dirname) + 1; 2455 continue; 2456 } else if (!S_ISDIR(st.st_mode)) 2457 continue; 2458 2459 if (dirname[strlen(dirname) - 1] == '/') 2460 trailingslash++; 2461 2462 if ((dirp = opendir(dirname)) == NULL) 2463 continue; 2464 2465 while ((dir = readdir(dirp)) != NULL) { 2466 char nbuf[MAXPATHLEN + 1]; 2467 2468 if (dir->d_name[0] == '.' && dir->d_namlen == 1) 2469 continue; 2470 if (dir->d_name[0] == '.' && dir->d_name[1] == '.' && 2471 dir->d_namlen == 2) 2472 continue; 2473 2474 (void)snprintf(nbuf, sizeof(nbuf), "%s%s%s", dirname, 2475 trailingslash ? "" : "/", dir->d_name); 2476 2477 /* 2478 * We have to do a stat to ensure it's 2479 * not a directory or special file. 2480 */ 2481 /* XXX: follow RFC959 and filter out non files ? */ 2482 if (simple || (stat(nbuf, &st) == 0 && 2483 S_ISREG(st.st_mode))) { 2484 char *p; 2485 2486 if (dout == NULL) { 2487 dout = dataconn("file list", (off_t)-1, 2488 "w"); 2489 if (dout == NULL) 2490 goto out; 2491 transflag++; 2492 } 2493 p = nbuf; 2494 if (nbuf[0] == '.' && nbuf[1] == '/') 2495 p = &nbuf[2]; 2496 b = fprintf(dout, "%s%s\n", p, 2497 type == TYPE_A ? "\r" : ""); 2498 total_bytes += b; 2499 total_bytes_out += b; 2500 byte_count += strlen(nbuf) + 1; 2501 } 2502 } 2503 (void) closedir(dirp); 2504 } 2505 2506 if (dout == NULL) 2507 reply(550, "No files found."); 2508 else if (ferror(dout) != 0) 2509 perror_reply(550, "Data connection"); 2510 else 2511 reply(226, "Transfer complete."); 2512 2513 transflag = 0; 2514 if (dout != NULL) 2515 (void) fclose(dout); 2516 data = -1; 2517 pdata = -1; 2518 out: 2519 total_xfers++; 2520 total_xfers_out++; 2521 if (p) 2522 free(p); 2523 if (freeglob) 2524 globfree(&gl); 2525 } 2526 2527 char * 2528 conffilename(s) 2529 const char *s; 2530 { 2531 static char filename[MAXPATHLEN + 1]; 2532 2533 if (*s == '/') 2534 strlcpy(filename, s, sizeof(filename)); 2535 else 2536 (void)snprintf(filename, sizeof(filename), "%s/%s", confdir ,s); 2537 return (filename); 2538 } 2539 2540 /* 2541 * logcmd -- 2542 * based on the arguments, syslog a message: 2543 * if bytes != -1 "<command> <file1> = <bytes> bytes" 2544 * else if file2 != NULL "<command> <file1> <file2>" 2545 * else "<command> <file1>" 2546 * if elapsed != NULL, append "in xxx.yyy seconds" 2547 * if error != NULL, append ": " + error 2548 */ 2549 2550 void 2551 logcmd(command, bytes, file1, file2, elapsed, error) 2552 const char *command; 2553 off_t bytes; 2554 const char *file1; 2555 const char *file2; 2556 const struct timeval *elapsed; 2557 const char *error; 2558 { 2559 char buf[MAXPATHLEN * 2 + 100], realfile[MAXPATHLEN + 1]; 2560 const char *p; 2561 size_t len; 2562 2563 if (logging <=1) 2564 return; 2565 2566 if ((p = realpath(file1, realfile)) == NULL) { 2567 #if 0 /* XXX: too noisy */ 2568 syslog(LOG_WARNING, "realpath `%s' failed: %s", 2569 realfile, strerror(errno)); 2570 #endif 2571 p = file1; 2572 } 2573 len = snprintf(buf, sizeof(buf), "%s %s", command, p); 2574 2575 if (bytes != (off_t)-1) { 2576 len += snprintf(buf + len, sizeof(buf) - len, 2577 " = %qd byte%s", (qdfmt_t) bytes, PLURAL(bytes)); 2578 } else if (file2 != NULL) { 2579 if ((p = realpath(file2, realfile)) == NULL) { 2580 #if 0 /* XXX: too noisy */ 2581 syslog(LOG_WARNING, "realpath `%s' failed: %s", 2582 realfile, strerror(errno)); 2583 #endif 2584 p = file2; 2585 } 2586 len += snprintf(buf + len, sizeof(buf) - len, " %s", p); 2587 } 2588 2589 if (elapsed != NULL) { 2590 len += snprintf(buf + len, sizeof(buf) - len, 2591 " in %ld.%.03d seconds", elapsed->tv_sec, 2592 (int)(elapsed->tv_usec / 1000)); 2593 } 2594 2595 if (error != NULL) 2596 len += snprintf(buf + len, sizeof(buf) - len, ": %s", error); 2597 2598 syslog(LOG_INFO, "%s", buf); 2599 } 2600 2601 char * 2602 xstrdup(s) 2603 const char *s; 2604 { 2605 char *new = strdup(s); 2606 2607 if (new == NULL) 2608 fatal("Local resource failure: malloc"); 2609 /* NOTREACHED */ 2610 return (new); 2611 } 2612
Indexes created Wed Sep 24 02:09:48 GMT 2025