ftpd.c revision 1.87
1 /* $NetBSD: ftpd.c,v 1.87 2000/03/05 06:12:19 lukem Exp $ */ 2 3 /* 4 * Copyright (c) 1997-2000 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Luke Mewburn. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 3. All advertising materials mentioning features or use of this software 19 * must display the following acknowledgement: 20 * This product includes software developed by the NetBSD 21 * Foundation, Inc. and its contributors. 22 * 4. Neither the name of The NetBSD Foundation nor the names of its 23 * contributors may be used to endorse or promote products derived 24 * from this software without specific prior written permission. 25 * 26 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 27 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 28 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 29 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 30 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 31 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 32 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 33 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 34 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 35 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 36 * POSSIBILITY OF SUCH DAMAGE. 37 */ 38 39 /* 40 * Copyright (c) 1985, 1988, 1990, 1992, 1993, 1994 41 * The Regents of the University of California. All rights reserved. 42 * 43 * Redistribution and use in source and binary forms, with or without 44 * modification, are permitted provided that the following conditions 45 * are met: 46 * 1. Redistributions of source code must retain the above copyright 47 * notice, this list of conditions and the following disclaimer. 48 * 2. Redistributions in binary form must reproduce the above copyright 49 * notice, this list of conditions and the following disclaimer in the 50 * documentation and/or other materials provided with the distribution. 51 * 3. All advertising materials mentioning features or use of this software 52 * must display the following acknowledgement: 53 * This product includes software developed by the University of 54 * California, Berkeley and its contributors. 55 * 4. Neither the name of the University nor the names of its contributors 56 * may be used to endorse or promote products derived from this software 57 * without specific prior written permission. 58 * 59 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 60 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 61 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 62 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 63 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 64 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 65 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 66 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 67 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 68 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 69 * SUCH DAMAGE. 70 */ 71 72 /* 73 * Copyright (C) 1997 and 1998 WIDE Project. 74 * All rights reserved. 75 * 76 * Redistribution and use in source and binary forms, with or without 77 * modification, are permitted provided that the following conditions 78 * are met: 79 * 1. Redistributions of source code must retain the above copyright 80 * notice, this list of conditions and the following disclaimer. 81 * 2. Redistributions in binary form must reproduce the above copyright 82 * notice, this list of conditions and the following disclaimer in the 83 * documentation and/or other materials provided with the distribution. 84 * 3. Neither the name of the project nor the names of its contributors 85 * may be used to endorse or promote products derived from this software 86 * without specific prior written permission. 87 * 88 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND 89 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 90 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 91 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE 92 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 93 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 94 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 95 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 96 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 97 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 98 * SUCH DAMAGE. 99 */ 100 101 #include <sys/cdefs.h> 102 #ifndef lint 103 __COPYRIGHT( 104 "@(#) Copyright (c) 1985, 1988, 1990, 1992, 1993, 1994\n\ 105 The Regents of the University of California. All rights reserved.\n"); 106 #endif /* not lint */ 107 108 #ifndef lint 109 #if 0 110 static char sccsid[] = "@(#)ftpd.c 8.5 (Berkeley) 4/28/95"; 111 #else 112 __RCSID("$NetBSD: ftpd.c,v 1.87 2000/03/05 06:12:19 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 <com_err.h> 160 #include <krb5/krb5.h> 161 #endif 162 163 #define GLOBAL 164 #include "extern.h" 165 #include "pathnames.h" 166 #include "version.h" 167 168 #if __STDC__ 169 #include <stdarg.h> 170 #else 171 #include <varargs.h> 172 #endif 173 174 int data; 175 jmp_buf urgcatch; 176 struct passwd *pw; 177 int sflag; 178 int stru; /* avoid C keyword */ 179 int mode; 180 int doutmp = 0; /* update utmp file */ 181 int mapped = 0; /* IPv4 connection on AF_INET6 socket */ 182 off_t file_size; 183 off_t byte_count; 184 static char ttyline[20]; 185 char *tty = ttyline; /* for klogin */ 186 static struct utmp utmp; /* for utmp */ 187 188 static char *anondir = NULL; 189 static char confdir[MAXPATHLEN]; 190 191 #if defined(KERBEROS) || defined(KERBEROS5) 192 int notickets = 1; 193 char *krbtkfile_env = NULL; 194 #endif 195 196 int epsvall = 0; 197 198 /* 199 * Timeout intervals for retrying connections 200 * to hosts that don't accept PORT cmds. This 201 * is a kludge, but given the problems with TCP... 202 */ 203 #define SWAITMAX 90 /* wait at most 90 seconds */ 204 #define SWAITINT 5 /* interval between retries */ 205 206 int swaitmax = SWAITMAX; 207 int swaitint = SWAITINT; 208 209 #define CURCLASSTYPE curclass.type == CLASS_GUEST ? "GUEST" : \ 210 curclass.type == CLASS_CHROOT ? "CHROOT" : \ 211 curclass.type == CLASS_REAL ? "REAL" : \ 212 "<unknown>" 213 214 static void ack __P((const char *)); 215 static int bind_pasv_addr __P((void)); 216 static int checkuser __P((const char *, const char *, int, int, char **)); 217 static int checkaccess __P((const char *)); 218 static FILE *dataconn __P((const char *, off_t, const char *)); 219 static void dolog __P((struct sockaddr *)); 220 static void end_login __P((void)); 221 static FILE *getdatasock __P((const char *)); 222 static char *gunique __P((const char *)); 223 static void lostconn __P((int)); 224 static void myoob __P((int)); 225 static int receive_data __P((FILE *, FILE *)); 226 static void replydirname __P((const char *, const char *)); 227 static int send_data __P((FILE *, FILE *, off_t, int)); 228 static struct passwd * 229 sgetpwnam __P((const char *)); 230 231 int main __P((int, char *[])); 232 233 #if defined(KERBEROS) || defined(KERBEROS5) 234 int klogin __P((struct passwd *, char *, char *, char *)); 235 void kdestroy __P((void)); 236 #endif 237 238 int 239 main(argc, argv) 240 int argc; 241 char *argv[]; 242 { 243 int addrlen, ch, on = 1, tos, keepalive; 244 #ifdef KERBEROS5 245 krb5_error_code kerror; 246 #endif 247 248 connections = 1; 249 debug = 0; 250 logging = 0; 251 pdata = -1; 252 sflag = 0; 253 usedefault = 1; 254 (void)strcpy(confdir, _DEFAULT_CONFDIR); 255 hostname[0] = '\0'; 256 257 while ((ch = getopt(argc, argv, "a:c:C:dh:lst:T:u:Uv")) != -1) { 258 switch (ch) { 259 case 'a': 260 anondir = optarg; 261 break; 262 263 case 'c': 264 (void)strlcpy(confdir, optarg, sizeof(confdir)); 265 break; 266 267 case 'C': 268 pw = sgetpwnam(optarg); 269 exit(checkaccess(optarg) ? 0 : 1); 270 /* NOTREACHED */ 271 272 case 'd': 273 case 'v': /* deprecated */ 274 debug = 1; 275 break; 276 277 case 'h': 278 strlcpy(hostname, optarg, sizeof(hostname)); 279 break; 280 281 case 'l': 282 logging++; /* > 1 == extra logging */ 283 break; 284 285 case 's': 286 sflag = 1; 287 break; 288 289 case 't': 290 case 'T': 291 case 'u': 292 warnx("-%c has been deprecated in favour of ftpd.conf", 293 ch); 294 break; 295 296 case 'U': 297 doutmp = 1; 298 break; 299 300 default: 301 if (optopt == 'a' || optopt == 'C') 302 exit(1); 303 warnx("unknown flag -%c ignored", optopt); 304 break; 305 } 306 } 307 308 /* 309 * LOG_NDELAY sets up the logging connection immediately, 310 * necessary for anonymous ftp's that chroot and can't do it later. 311 */ 312 openlog("ftpd", LOG_PID | LOG_NDELAY, LOG_FTP); 313 addrlen = sizeof(his_addr); /* xxx */ 314 if (getpeername(0, (struct sockaddr *)&his_addr, &addrlen) < 0) { 315 syslog(LOG_ERR, "getpeername (%s): %m",argv[0]); 316 exit(1); 317 } 318 addrlen = sizeof(ctrl_addr); 319 if (getsockname(0, (struct sockaddr *)&ctrl_addr, &addrlen) < 0) { 320 syslog(LOG_ERR, "getsockname (%s): %m",argv[0]); 321 exit(1); 322 } 323 if (his_addr.su_family == AF_INET6 324 && IN6_IS_ADDR_V4MAPPED(&his_addr.su_sin6.sin6_addr)) { 325 #if 1 326 /* 327 * IPv4 control connection arrived to AF_INET6 socket. 328 * I hate to do this, but this is the easiest solution. 329 */ 330 union sockunion tmp_addr; 331 const int off = sizeof(struct in6_addr) - sizeof(struct in_addr); 332 333 tmp_addr = his_addr; 334 memset(&his_addr, 0, sizeof(his_addr)); 335 his_addr.su_sin.sin_family = AF_INET; 336 his_addr.su_sin.sin_len = sizeof(his_addr.su_sin); 337 memcpy(&his_addr.su_sin.sin_addr, 338 &tmp_addr.su_sin6.sin6_addr.s6_addr[off], 339 sizeof(his_addr.su_sin.sin_addr)); 340 his_addr.su_sin.sin_port = tmp_addr.su_sin6.sin6_port; 341 342 tmp_addr = ctrl_addr; 343 memset(&ctrl_addr, 0, sizeof(ctrl_addr)); 344 ctrl_addr.su_sin.sin_family = AF_INET; 345 ctrl_addr.su_sin.sin_len = sizeof(ctrl_addr.su_sin); 346 memcpy(&ctrl_addr.su_sin.sin_addr, 347 &tmp_addr.su_sin6.sin6_addr.s6_addr[off], 348 sizeof(ctrl_addr.su_sin.sin_addr)); 349 ctrl_addr.su_sin.sin_port = tmp_addr.su_sin6.sin6_port; 350 #else 351 while (fgets(line, sizeof(line), fd) != NULL) { 352 if ((cp = strchr(line, '\n')) != NULL) 353 *cp = '\0'; 354 lreply(530, "%s", line); 355 } 356 (void) fflush(stdout); 357 (void) fclose(fd); 358 reply(530, 359 "Connection from IPv4 mapped address is not supported."); 360 exit(0); 361 #endif 362 363 mapped = 1; 364 } else 365 mapped = 0; 366 #ifdef IP_TOS 367 if (!mapped && his_addr.su_family == AF_INET) { 368 tos = IPTOS_LOWDELAY; 369 if (setsockopt(0, IPPROTO_IP, IP_TOS, (char *)&tos, 370 sizeof(int)) < 0) 371 syslog(LOG_WARNING, "setsockopt (IP_TOS): %m"); 372 } 373 #endif 374 data_source.su_port = htons(ntohs(ctrl_addr.su_port) - 1); 375 376 /* if the hostname hasn't been given, attempt to determine it */ 377 if (hostname[0] == '\0') { 378 if (getnameinfo((struct sockaddr *)&ctrl_addr, ctrl_addr.su_len, 379 hostname, sizeof(hostname), NULL, 0, 0) != 0) 380 (void)gethostname(hostname, sizeof(hostname)); 381 hostname[sizeof(hostname) - 1] = '\0'; 382 } 383 384 /* set this here so klogin can use it... */ 385 (void)snprintf(ttyline, sizeof(ttyline), "ftp%d", getpid()); 386 387 (void) freopen(_PATH_DEVNULL, "w", stderr); 388 (void) signal(SIGPIPE, lostconn); 389 (void) signal(SIGCHLD, SIG_IGN); 390 if (signal(SIGURG, myoob) == SIG_ERR) 391 syslog(LOG_ERR, "signal: %m"); 392 393 /* Try to handle urgent data inline */ 394 #ifdef SO_OOBINLINE 395 if (setsockopt(0, SOL_SOCKET, SO_OOBINLINE, (char *)&on, sizeof(on)) < 0) 396 syslog(LOG_ERR, "setsockopt: %m"); 397 #endif 398 /* Set keepalives on the socket to detect dropped connections. */ 399 #ifdef SO_KEEPALIVE 400 keepalive = 1; 401 if (setsockopt(0, SOL_SOCKET, SO_KEEPALIVE, (char *)&keepalive, 402 sizeof(int)) < 0) 403 syslog(LOG_WARNING, "setsockopt (SO_KEEPALIVE): %m"); 404 #endif 405 406 #ifdef F_SETOWN 407 if (fcntl(fileno(stdin), F_SETOWN, getpid()) == -1) 408 syslog(LOG_ERR, "fcntl F_SETOWN: %m"); 409 #endif 410 dolog((struct sockaddr *)&his_addr); 411 /* 412 * Set up default state 413 */ 414 data = -1; 415 type = TYPE_A; 416 form = FORM_N; 417 stru = STRU_F; 418 mode = MODE_S; 419 tmpline[0] = '\0'; 420 hasyyerrored = 0; 421 422 #ifdef KERBEROS5 423 kerror = krb5_init_context(&kcontext); 424 if (kerror) { 425 syslog(LOG_NOTICE, "%s when initializing Kerberos context", 426 error_message(kerror)); 427 exit(0); 428 } 429 #endif /* KERBEROS5 */ 430 431 init_curclass(); 432 curclass.timeout = 300; /* 5 minutes, as per login(1) */ 433 curclass.type = CLASS_REAL; 434 435 /* If logins are disabled, print out the message. */ 436 if (format_file(_PATH_NOLOGIN, 530)) { 437 reply(530, "System not available."); 438 exit(0); 439 } 440 (void)format_file(conffilename(_PATH_FTPWELCOME), 220); 441 /* reply(220,) must follow */ 442 reply(220, "%s FTP server (%s) ready.", hostname, FTPD_VERSION); 443 444 (void) setjmp(errcatch); 445 for (;;) 446 (void) yyparse(); 447 /* NOTREACHED */ 448 } 449 450 static void 451 lostconn(signo) 452 int signo; 453 { 454 455 if (debug) 456 syslog(LOG_DEBUG, "lost connection"); 457 dologout(1); 458 } 459 460 /* 461 * Save the result of a getpwnam. Used for USER command, since 462 * the data returned must not be clobbered by any other command 463 * (e.g., globbing). 464 */ 465 static struct passwd * 466 sgetpwnam(name) 467 const char *name; 468 { 469 static struct passwd save; 470 struct passwd *p; 471 472 if ((p = getpwnam(name)) == NULL) 473 return (p); 474 if (save.pw_name) { 475 free((char *)save.pw_name); 476 memset(save.pw_passwd, 0, strlen(save.pw_passwd)); 477 free((char *)save.pw_passwd); 478 free((char *)save.pw_gecos); 479 free((char *)save.pw_dir); 480 free((char *)save.pw_shell); 481 } 482 save = *p; 483 save.pw_name = xstrdup(p->pw_name); 484 save.pw_passwd = xstrdup(p->pw_passwd); 485 save.pw_gecos = xstrdup(p->pw_gecos); 486 save.pw_dir = xstrdup(p->pw_dir); 487 save.pw_shell = xstrdup(p->pw_shell); 488 return (&save); 489 } 490 491 static int login_attempts; /* number of failed login attempts */ 492 static int askpasswd; /* had user command, ask for passwd */ 493 static char curname[10]; /* current USER name */ 494 495 /* 496 * USER command. 497 * Sets global passwd pointer pw if named account exists and is acceptable; 498 * sets askpasswd if a PASS command is expected. If logged in previously, 499 * need to reset state. If name is "ftp" or "anonymous", the name is not in 500 * _PATH_FTPUSERS, and ftp account exists, set guest and pw, then just return. 501 * If account doesn't exist, ask for passwd anyway. Otherwise, check user 502 * requesting login privileges. Disallow anyone who does not have a standard 503 * shell as returned by getusershell(). Disallow anyone mentioned in the file 504 * _PATH_FTPUSERS to allow people such as root and uucp to be avoided. 505 */ 506 void 507 user(name) 508 const char *name; 509 { 510 if (logged_in) { 511 switch (curclass.type) { 512 case CLASS_GUEST: 513 reply(530, "Can't change user from guest login."); 514 return; 515 case CLASS_CHROOT: 516 reply(530, "Can't change user from chroot user."); 517 return; 518 case CLASS_REAL: 519 end_login(); 520 break; 521 default: 522 abort(); 523 } 524 } 525 526 #if defined(KERBEROS) || defined(KERBEROS5) 527 kdestroy(); 528 #endif 529 530 curclass.type = CLASS_REAL; 531 if (strcmp(name, "ftp") == 0 || strcmp(name, "anonymous") == 0) { 532 /* need `pw' setup for checkaccess() and checkuser () */ 533 if ((pw = sgetpwnam("ftp")) == NULL) 534 reply(530, "User %s unknown.", name); 535 else if (! checkaccess("ftp") || ! checkaccess("anonymous")) 536 reply(530, "User %s access denied.", name); 537 else { 538 curclass.type = CLASS_GUEST; 539 askpasswd = 1; 540 reply(331, 541 "Guest login ok, type your name as password."); 542 } 543 if (!askpasswd && logging) 544 syslog(LOG_NOTICE, 545 "ANONYMOUS FTP LOGIN REFUSED FROM %s", remotehost); 546 return; 547 } 548 549 pw = sgetpwnam(name); 550 if (logging) 551 strlcpy(curname, name, sizeof(curname)); 552 553 #ifdef SKEY 554 if (skey_haskey(name) == 0) { 555 char *myskey; 556 557 myskey = skey_keyinfo(name); 558 reply(331, "Password [%s] required for %s.", 559 myskey ? myskey : "error getting challenge", name); 560 } else 561 #endif 562 reply(331, "Password required for %s.", name); 563 564 askpasswd = 1; 565 /* 566 * Delay before reading passwd after first failed 567 * attempt to slow down passwd-guessing programs. 568 */ 569 if (login_attempts) 570 sleep((unsigned) login_attempts); 571 } 572 573 /* 574 * Determine whether something is to happen (allow access, chroot) 575 * for a user. Each line is a shell-style glob followed by 576 * `yes' or `no'. 577 * 578 * For backward compatability, `allow' and `deny' are synonymns 579 * for `yes' and `no', respectively. 580 * 581 * Each glob is matched against the username in turn, and the first 582 * match found is used. If no match is found, the result is the 583 * argument `def'. If a match is found but without and explicit 584 * `yes'/`no', the result is the opposite of def. 585 * 586 * If the file doesn't exist at all, the result is the argument 587 * `nofile' 588 * 589 * Any line starting with `#' is considered a comment and ignored. 590 * 591 * Returns 0 if the user is denied, or 1 if they are allowed. 592 * 593 * NOTE: needs struct passwd *pw setup before use. 594 */ 595 int 596 checkuser(fname, name, def, nofile, retclass) 597 const char *fname, *name; 598 int def, nofile; 599 char **retclass; 600 { 601 FILE *fd; 602 int retval; 603 char *glob, *perm, *class, *buf, *p; 604 size_t len, line; 605 606 retval = def; 607 if (retclass != NULL) 608 *retclass = NULL; 609 if ((fd = fopen(conffilename(fname), "r")) == NULL) 610 return nofile; 611 612 line = 0; 613 for (; 614 (buf = fparseln(fd, &len, &line, NULL, FPARSELN_UNESCCOMM | 615 FPARSELN_UNESCCONT | FPARSELN_UNESCESC)) != NULL; 616 free(buf), buf = NULL) { 617 glob = perm = class = NULL; 618 p = buf; 619 if (len < 1) 620 continue; 621 if (p[len - 1] == '\n') 622 p[--len] = '\0'; 623 if (EMPTYSTR(p)) 624 continue; 625 626 NEXTWORD(p, glob); 627 NEXTWORD(p, perm); 628 NEXTWORD(p, class); 629 if (EMPTYSTR(glob)) 630 continue; 631 if (!EMPTYSTR(class)) { 632 if (strcasecmp(class, "all") == 0 || 633 strcasecmp(class, "none") == 0) { 634 syslog(LOG_WARNING, 635 "%s line %d: illegal user-defined class `%s' - skipping entry", 636 fname, (int)line, class); 637 continue; 638 } 639 } 640 641 /* have a host specifier */ 642 if ((p = strchr(glob, '@')) != NULL) { 643 u_int32_t net, mask, addr; 644 int bits; 645 646 *p++ = '\0'; 647 /* check against network or CIDR */ 648 if (isdigit(*p) && 649 (bits = inet_net_pton(AF_INET, p, 650 &net, sizeof(net))) != -1) { 651 net = ntohl(net); 652 mask = 0xffffffffU << (32 - bits); 653 addr = ntohl(his_addr.su_sin.sin_addr.s_addr); 654 if ((addr & mask) != net) 655 continue; 656 657 /* check against hostname glob */ 658 } else if (fnmatch(p, remotehost, 0) != 0) 659 continue; 660 } 661 662 /* have a group specifier */ 663 if ((p = strchr(glob, ':')) != NULL) { 664 gid_t *groups, *ng; 665 int gsize, i, found; 666 667 *p++ = '\0'; 668 groups = NULL; 669 gsize = 16; 670 do { 671 ng = realloc(groups, gsize * sizeof(gid_t)); 672 if (ng == NULL) 673 fatal( 674 "Local resource failure: realloc"); 675 groups = ng; 676 } while (getgrouplist(pw->pw_name, pw->pw_gid, 677 groups, &gsize) == -1); 678 found = 0; 679 for (i = 0; i < gsize; i++) { 680 struct group *g; 681 682 if ((g = getgrgid(groups[i])) == NULL) 683 continue; 684 if (fnmatch(p, g->gr_name, 0) == 0) { 685 found = 1; 686 break; 687 } 688 } 689 free(groups); 690 if (!found) 691 continue; 692 } 693 694 /* check against username glob */ 695 if (fnmatch(glob, name, 0) != 0) 696 continue; 697 698 if (perm != NULL && 699 ((strcasecmp(perm, "allow") == 0) || 700 (strcasecmp(perm, "yes") == 0))) 701 retval = 1; 702 else if (perm != NULL && 703 ((strcasecmp(perm, "deny") == 0) || 704 (strcasecmp(perm, "no") == 0))) 705 retval = 0; 706 else 707 retval = !def; 708 if (!EMPTYSTR(class) && retclass != NULL) 709 *retclass = xstrdup(class); 710 free(buf); 711 break; 712 } 713 (void) fclose(fd); 714 return (retval); 715 } 716 717 /* 718 * Check if user is allowed by /etc/ftpusers 719 * returns 1 for yes, 0 for no 720 * 721 * NOTE: needs struct passwd *pw setup (for checkuser()) 722 */ 723 int 724 checkaccess(name) 725 const char *name; 726 { 727 728 return (checkuser(_PATH_FTPUSERS, name, 1, 0, NULL)); 729 } 730 731 /* 732 * Terminate login as previous user, if any, resetting state; 733 * used when USER command is given or login fails. 734 */ 735 static void 736 end_login() 737 { 738 739 (void) seteuid((uid_t)0); 740 if (logged_in) { 741 logwtmp(ttyline, "", ""); 742 if (doutmp) 743 logout(utmp.ut_line); 744 } 745 pw = NULL; 746 logged_in = 0; 747 quietmessages = 0; 748 curclass.type = CLASS_REAL; 749 } 750 751 void 752 pass(passwd) 753 const char *passwd; 754 { 755 int rval; 756 const char *cp, *shell, *home; 757 char *class; 758 759 class = NULL; 760 if (logged_in || askpasswd == 0) { 761 reply(503, "Login with USER first."); 762 return; 763 } 764 askpasswd = 0; 765 if (curclass.type != CLASS_GUEST) { 766 /* "ftp" is only account allowed no password */ 767 if (pw == NULL) { 768 rval = 1; /* failure below */ 769 goto skip; 770 } 771 #if defined(KERBEROS) || defined(KERBEROS5) 772 if (klogin(pw, "", hostname, (char *)passwd) == 0) { 773 rval = 0; 774 goto skip; 775 } 776 #endif 777 #ifdef SKEY 778 if (skey_haskey(pw->pw_name) == 0) { 779 char *p; 780 int r; 781 782 p = xstrdup(passwd); 783 r = skey_passcheck(pw->pw_name, p); 784 free(p); 785 if (r != -1) { 786 rval = 0; 787 goto skip; 788 } 789 } 790 #endif 791 if (!sflag && *pw->pw_passwd != '\0' && 792 !strcmp(crypt(passwd, pw->pw_passwd), pw->pw_passwd)) { 793 rval = 0; 794 goto skip; 795 } 796 rval = 1; 797 798 skip: 799 if (pw != NULL && pw->pw_expire && time(NULL) >= pw->pw_expire) 800 rval = 2; 801 /* 802 * If rval > 0, the user failed the authentication check 803 * above. If rval == 0, either Kerberos or local authentication 804 * succeeded. 805 */ 806 if (rval) { 807 reply(530, rval == 2 ? "Password expired." : 808 "Login incorrect."); 809 if (logging) { 810 syslog(LOG_NOTICE, 811 "FTP LOGIN FAILED FROM %s", remotehost); 812 syslog(LOG_AUTHPRIV | LOG_NOTICE, 813 "FTP LOGIN FAILED FROM %s, %s", 814 remotehost, curname); 815 } 816 pw = NULL; 817 if (login_attempts++ >= 5) { 818 syslog(LOG_NOTICE, 819 "repeated login failures from %s", 820 remotehost); 821 exit(0); 822 } 823 return; 824 } 825 } 826 827 /* password was ok; see if anything else prevents login */ 828 if (! checkuser(_PATH_FTPUSERS, pw->pw_name, 1, 0, &class)) { 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 goto bad; 834 } 835 /* check for valid shell, if not guest user */ 836 if ((shell = pw->pw_shell) == NULL || *shell == 0) 837 shell = _PATH_BSHELL; 838 while ((cp = getusershell()) != NULL) 839 if (strcmp(cp, shell) == 0) 840 break; 841 endusershell(); 842 if (cp == NULL && curclass.type != CLASS_GUEST) { 843 reply(530, "User %s may not use FTP.", pw->pw_name); 844 if (logging) 845 syslog(LOG_NOTICE, "FTP LOGIN REFUSED FROM %s, %s", 846 remotehost, pw->pw_name); 847 goto bad; 848 } 849 850 login_attempts = 0; /* this time successful */ 851 if (setegid((gid_t)pw->pw_gid) < 0) { 852 reply(550, "Can't set gid."); 853 goto bad; 854 } 855 (void) initgroups(pw->pw_name, pw->pw_gid); 856 857 /* open wtmp before chroot */ 858 logwtmp(ttyline, pw->pw_name, remotehost); 859 860 /* open utmp before chroot */ 861 if (doutmp) { 862 memset((void *)&utmp, 0, sizeof(utmp)); 863 (void)time(&utmp.ut_time); 864 (void)strncpy(utmp.ut_name, pw->pw_name, sizeof(utmp.ut_name)); 865 (void)strncpy(utmp.ut_host, remotehost, sizeof(utmp.ut_host)); 866 (void)strncpy(utmp.ut_line, ttyline, sizeof(utmp.ut_line)); 867 login(&utmp); 868 } 869 870 logged_in = 1; 871 872 /* check user in /etc/ftpchroot */ 873 if (checkuser(_PATH_FTPCHROOT, pw->pw_name, 0, 0, NULL)) { 874 if (curclass.type == CLASS_GUEST) { 875 syslog(LOG_NOTICE, 876 "Can't change guest user to chroot class; remove entry in %s", 877 _PATH_FTPCHROOT); 878 exit(1); 879 } 880 curclass.type = CLASS_CHROOT; 881 } 882 if (class == NULL) { 883 switch (curclass.type) { 884 case CLASS_GUEST: 885 class = xstrdup("guest"); 886 break; 887 case CLASS_CHROOT: 888 class = xstrdup("chroot"); 889 break; 890 case CLASS_REAL: 891 class = xstrdup("real"); 892 break; 893 default: 894 abort(); 895 } 896 } 897 898 /* parse ftpd.conf, setting up various parameters */ 899 parse_conf(class); 900 count_users(); 901 if (curclass.limit != -1 && connections > curclass.limit) { 902 if (! EMPTYSTR(curclass.limitfile)) 903 (void)format_file(conffilename(curclass.limitfile),530); 904 reply(530, 905 "User %s access denied, connection limit of %d reached.", 906 pw->pw_name, curclass.limit); 907 syslog(LOG_NOTICE, 908 "Maximum connection limit of %d for class %s reached, login refused", 909 curclass.limit, curclass.classname); 910 goto bad; 911 } 912 913 home = "/"; 914 switch (curclass.type) { 915 case CLASS_GUEST: 916 /* 917 * We MUST do a chdir() after the chroot. Otherwise 918 * the old current directory will be accessible as "." 919 * outside the new root! 920 */ 921 if (chroot(anondir ? anondir : pw->pw_dir) < 0 || 922 chdir("/") < 0) { 923 reply(550, "Can't set guest privileges."); 924 goto bad; 925 } 926 break; 927 case CLASS_CHROOT: 928 if (chroot(pw->pw_dir) < 0 || chdir("/") < 0) { 929 reply(550, "Can't change root."); 930 goto bad; 931 } 932 break; 933 case CLASS_REAL: 934 if (chdir(pw->pw_dir) < 0) { 935 if (chdir("/") < 0) { 936 reply(530, 937 "User %s: can't change directory to %s.", 938 pw->pw_name, pw->pw_dir); 939 goto bad; 940 } else 941 lreply(230, 942 "No directory! Logging in with home=/"); 943 } else 944 home = pw->pw_dir; 945 break; 946 } 947 if (seteuid((uid_t)pw->pw_uid) < 0) { 948 reply(550, "Can't set uid."); 949 goto bad; 950 } 951 setenv("HOME", home, 1); 952 953 if (curclass.type == CLASS_GUEST && passwd[0] == '-') 954 quietmessages = 1; 955 956 /* 957 * Display a login message, if it exists. 958 * N.B. reply(230,) must follow the message. 959 */ 960 (void)format_file(conffilename(curclass.motd), 230); 961 show_chdir_messages(230); 962 if (curclass.type == CLASS_GUEST) { 963 reply(230, "Guest login ok, access restrictions apply."); 964 #ifdef HASSETPROCTITLE 965 snprintf(proctitle, sizeof(proctitle), 966 "%s: anonymous/%.*s", remotehost, 967 (int) (sizeof(proctitle) - sizeof(remotehost) - 968 sizeof(": anonymous/")), passwd); 969 setproctitle(proctitle); 970 #endif /* HASSETPROCTITLE */ 971 if (logging) 972 syslog(LOG_INFO, 973 "ANONYMOUS FTP LOGIN FROM %s, %s (class: %s, type: %s)", 974 remotehost, passwd, 975 curclass.classname, CURCLASSTYPE); 976 } else { 977 reply(230, "User %s logged in.", pw->pw_name); 978 #ifdef HASSETPROCTITLE 979 snprintf(proctitle, sizeof(proctitle), 980 "%s: %s", remotehost, pw->pw_name); 981 setproctitle(proctitle); 982 #endif /* HASSETPROCTITLE */ 983 if (logging) 984 syslog(LOG_INFO, 985 "FTP LOGIN FROM %s as %s (class: %s, type: %s)", 986 remotehost, pw->pw_name, 987 curclass.classname, CURCLASSTYPE); 988 } 989 (void) umask(curclass.umask); 990 goto cleanuppass; 991 bad: 992 /* Forget all about it... */ 993 end_login(); 994 cleanuppass: 995 if (class) 996 free(class); 997 } 998 999 void 1000 retrieve(argv, name) 1001 char *argv[]; 1002 const char *name; 1003 { 1004 FILE *fin = NULL, *dout; 1005 struct stat st; 1006 int (*closefunc) __P((FILE *)) = NULL; 1007 int log, sendrv, closerv, stderrfd, isconversion, isdata, isls; 1008 struct timeval start, finish, td, *tdp; 1009 const char *dispname; 1010 1011 sendrv = closerv = stderrfd = -1; 1012 isconversion = isdata = isls = log = 0; 1013 tdp = NULL; 1014 dispname = name; 1015 if (argv == NULL) { 1016 log = 1; 1017 isdata = 1; 1018 fin = fopen(name, "r"); 1019 closefunc = fclose; 1020 if (fin == NULL) 1021 argv = do_conversion(name); 1022 if (argv != NULL) { 1023 isconversion++; 1024 syslog(LOG_INFO, "get command: '%s' on '%s'", 1025 argv[0], name); 1026 } 1027 } 1028 if (argv != NULL) { 1029 char temp[MAXPATHLEN]; 1030 1031 if (strcmp(argv[0], INTERNAL_LS) == 0) { 1032 isls = 1; 1033 stderrfd = -1; 1034 } else { 1035 (void)snprintf(temp, sizeof(temp), "%s", TMPFILE); 1036 stderrfd = mkstemp(temp); 1037 if (stderrfd != -1) 1038 (void)unlink(temp); 1039 } 1040 dispname = argv[0]; 1041 fin = ftpd_popen(argv, "r", stderrfd); 1042 closefunc = ftpd_pclose; 1043 st.st_size = -1; 1044 st.st_blksize = BUFSIZ; 1045 } 1046 if (fin == NULL) { 1047 if (errno != 0) { 1048 perror_reply(550, dispname); 1049 if (log) 1050 logcmd("get", -1, name, NULL, NULL, 1051 strerror(errno)); 1052 } 1053 goto cleanupretrieve; 1054 } 1055 byte_count = -1; 1056 if (argv == NULL 1057 && (fstat(fileno(fin), &st) < 0 || !S_ISREG(st.st_mode))) { 1058 reply(550, "%s: not a plain file.", dispname); 1059 goto done; 1060 } 1061 if (restart_point) { 1062 if (type == TYPE_A) { 1063 off_t i; 1064 int c; 1065 1066 for (i = 0; i < restart_point; i++) { 1067 if ((c=getc(fin)) == EOF) { 1068 perror_reply(550, dispname); 1069 goto done; 1070 } 1071 if (c == '\n') 1072 i++; 1073 } 1074 } else if (lseek(fileno(fin), restart_point, SEEK_SET) < 0) { 1075 perror_reply(550, dispname); 1076 goto done; 1077 } 1078 } 1079 dout = dataconn(dispname, st.st_size, "w"); 1080 if (dout == NULL) 1081 goto done; 1082 1083 (void)gettimeofday(&start, NULL); 1084 sendrv = send_data(fin, dout, st.st_blksize, isdata); 1085 (void)gettimeofday(&finish, NULL); 1086 (void) fclose(dout); 1087 timersub(&finish, &start, &td); 1088 tdp = &td; 1089 data = -1; 1090 pdata = -1; 1091 done: 1092 if (log) 1093 logcmd("get", byte_count, name, NULL, tdp, NULL); 1094 closerv = (*closefunc)(fin); 1095 if (sendrv == 0) { 1096 FILE *err; 1097 struct stat sb; 1098 1099 if (!isls && argv != NULL && closerv != 0) { 1100 lreply(226, 1101 "Command returned an exit status of %d", 1102 closerv); 1103 if (isconversion) 1104 syslog(LOG_INFO, 1105 "retrieve command: '%s' returned %d", 1106 argv[0], closerv); 1107 } 1108 if (!isls && argv != NULL && stderrfd != -1 && 1109 (fstat(stderrfd, &sb) == 0) && sb.st_size > 0 && 1110 ((err = fdopen(stderrfd, "r")) != NULL)) { 1111 char *cp, line[LINE_MAX]; 1112 1113 lreply(226, "Command error messages:"); 1114 rewind(err); 1115 while (fgets(line, sizeof(line), err) != NULL) { 1116 if ((cp = strchr(line, '\n')) != NULL) 1117 *cp = '\0'; 1118 lreply(0, " %s", line); 1119 } 1120 (void) fflush(stdout); 1121 (void) fclose(err); 1122 /* a reply(226,) must follow */ 1123 } 1124 reply(226, "Transfer complete."); 1125 } 1126 cleanupretrieve: 1127 if (stderrfd != -1) 1128 (void)close(stderrfd); 1129 if (isconversion) 1130 free(argv); 1131 } 1132 1133 void 1134 store(name, mode, unique) 1135 const char *name, *mode; 1136 int unique; 1137 { 1138 FILE *fout, *din; 1139 struct stat st; 1140 int (*closefunc) __P((FILE *)); 1141 struct timeval start, finish, td, *tdp; 1142 char *desc; 1143 1144 desc = (*mode == 'w') ? "put" : "append"; 1145 if (unique && stat(name, &st) == 0 && 1146 (name = gunique(name)) == NULL) { 1147 logcmd(desc, -1, name, NULL, NULL, "cannot create unique file"); 1148 return; 1149 } 1150 1151 if (restart_point) 1152 mode = "r+"; 1153 fout = fopen(name, mode); 1154 closefunc = fclose; 1155 tdp = NULL; 1156 if (fout == NULL) { 1157 perror_reply(553, name); 1158 logcmd(desc, -1, name, NULL, NULL, strerror(errno)); 1159 return; 1160 } 1161 byte_count = -1; 1162 if (restart_point) { 1163 if (type == TYPE_A) { 1164 off_t i; 1165 int c; 1166 1167 for (i = 0; i < restart_point; i++) { 1168 if ((c=getc(fout)) == EOF) { 1169 perror_reply(550, name); 1170 goto done; 1171 } 1172 if (c == '\n') 1173 i++; 1174 } 1175 /* 1176 * We must do this seek to "current" position 1177 * because we are changing from reading to 1178 * writing. 1179 */ 1180 if (fseek(fout, 0L, SEEK_CUR) < 0) { 1181 perror_reply(550, name); 1182 goto done; 1183 } 1184 } else if (lseek(fileno(fout), restart_point, SEEK_SET) < 0) { 1185 perror_reply(550, name); 1186 goto done; 1187 } 1188 } 1189 din = dataconn(name, (off_t)-1, "r"); 1190 if (din == NULL) 1191 goto done; 1192 (void)gettimeofday(&start, NULL); 1193 if (receive_data(din, fout) == 0) { 1194 if (unique) 1195 reply(226, "Transfer complete (unique file name:%s).", 1196 name); 1197 else 1198 reply(226, "Transfer complete."); 1199 } 1200 (void)gettimeofday(&finish, NULL); 1201 (void) fclose(din); 1202 timersub(&finish, &start, &td); 1203 tdp = &td; 1204 data = -1; 1205 pdata = -1; 1206 done: 1207 logcmd(desc, byte_count, name, NULL, tdp, NULL); 1208 (*closefunc)(fout); 1209 } 1210 1211 static FILE * 1212 getdatasock(mode) 1213 const char *mode; 1214 { 1215 int on = 1, s, t, tries; 1216 1217 if (data >= 0) 1218 return (fdopen(data, mode)); 1219 (void) seteuid((uid_t)0); 1220 s = socket(ctrl_addr.su_family, SOCK_STREAM, 0); 1221 if (s < 0) 1222 goto bad; 1223 if (setsockopt(s, SOL_SOCKET, SO_REUSEADDR, 1224 (char *) &on, sizeof(on)) < 0) 1225 goto bad; 1226 if (setsockopt(s, SOL_SOCKET, SO_KEEPALIVE, 1227 (char *) &on, sizeof(on)) < 0) 1228 goto bad; 1229 /* anchor socket to avoid multi-homing problems */ 1230 data_source = ctrl_addr; 1231 data_source.su_port = htons(20); /* ftp-data port */ 1232 for (tries = 1; ; tries++) { 1233 if (bind(s, (struct sockaddr *)&data_source, 1234 data_source.su_len) >= 0) 1235 break; 1236 if (errno != EADDRINUSE || tries > 10) 1237 goto bad; 1238 sleep(tries); 1239 } 1240 (void) seteuid((uid_t)pw->pw_uid); 1241 #ifdef IP_TOS 1242 if (!mapped && ctrl_addr.su_family == AF_INET) { 1243 on = IPTOS_THROUGHPUT; 1244 if (setsockopt(s, IPPROTO_IP, IP_TOS, (char *)&on, 1245 sizeof(int)) < 0) 1246 syslog(LOG_WARNING, "setsockopt (IP_TOS): %m"); 1247 } 1248 #endif 1249 return (fdopen(s, mode)); 1250 bad: 1251 /* Return the real value of errno (close may change it) */ 1252 t = errno; 1253 (void) seteuid((uid_t)pw->pw_uid); 1254 (void) close(s); 1255 errno = t; 1256 return (NULL); 1257 } 1258 1259 static FILE * 1260 dataconn(name, size, mode) 1261 const char *name; 1262 off_t size; 1263 const char *mode; 1264 { 1265 char sizebuf[32]; 1266 FILE *file; 1267 int retry = 0, tos, keepalive; 1268 1269 file_size = size; 1270 byte_count = 0; 1271 if (size != (off_t) -1) 1272 (void)snprintf(sizebuf, sizeof(sizebuf), " (%qd byte%s)", 1273 (qdfmt_t)size, PLURAL(size)); 1274 else 1275 sizebuf[0] = '\0'; 1276 if (pdata >= 0) { 1277 union sockunion from; 1278 int s, fromlen = sizeof(from); 1279 1280 (void) alarm(curclass.timeout); 1281 s = accept(pdata, (struct sockaddr *)&from, &fromlen); 1282 (void) alarm(0); 1283 if (s < 0) { 1284 reply(425, "Can't open data connection."); 1285 (void) close(pdata); 1286 pdata = -1; 1287 return (NULL); 1288 } 1289 (void) close(pdata); 1290 pdata = s; 1291 switch (from.su_family) { 1292 case AF_INET: 1293 #ifdef IP_TOS 1294 if (!mapped) { 1295 tos = IPTOS_THROUGHPUT; 1296 (void) setsockopt(s, IPPROTO_IP, IP_TOS, 1297 (char *)&tos, sizeof(int)); 1298 } 1299 break; 1300 #endif 1301 } 1302 /* Set keepalives on the socket to detect dropped conns. */ 1303 #ifdef SO_KEEPALIVE 1304 keepalive = 1; 1305 (void) setsockopt(s, SOL_SOCKET, SO_KEEPALIVE, 1306 (char *)&keepalive, sizeof(int)); 1307 #endif 1308 reply(150, "Opening %s mode data connection for '%s'%s.", 1309 type == TYPE_A ? "ASCII" : "BINARY", name, sizebuf); 1310 return (fdopen(pdata, mode)); 1311 } 1312 if (data >= 0) { 1313 reply(125, "Using existing data connection for '%s'%s.", 1314 name, sizebuf); 1315 usedefault = 1; 1316 return (fdopen(data, mode)); 1317 } 1318 if (usedefault) 1319 data_dest = his_addr; 1320 usedefault = 1; 1321 file = getdatasock(mode); 1322 if (file == NULL) { 1323 char hbuf[INET6_ADDRSTRLEN]; 1324 char pbuf[10]; 1325 getnameinfo((struct sockaddr *)&data_source, data_source.su_len, 1326 hbuf, sizeof(hbuf), pbuf, sizeof(pbuf), 1327 NI_NUMERICHOST | NI_NUMERICSERV); 1328 reply(425, "Can't create data socket (%s,%s): %s.", 1329 hbuf, pbuf, strerror(errno)); 1330 return (NULL); 1331 } 1332 data = fileno(file); 1333 while (connect(data, (struct sockaddr *)&data_dest, 1334 data_dest.su_len) < 0) { 1335 if (errno == EADDRINUSE && retry < swaitmax) { 1336 sleep((unsigned) swaitint); 1337 retry += swaitint; 1338 continue; 1339 } 1340 perror_reply(425, "Can't build data connection"); 1341 (void) fclose(file); 1342 data = -1; 1343 return (NULL); 1344 } 1345 reply(150, "Opening %s mode data connection for '%s'%s.", 1346 type == TYPE_A ? "ASCII" : "BINARY", name, sizebuf); 1347 return (file); 1348 } 1349 1350 /* 1351 * Tranfer the contents of "instr" to "outstr" peer using the appropriate 1352 * encapsulation of the data subject * to Mode, Structure, and Type. 1353 * 1354 * NB: Form isn't handled. 1355 */ 1356 static int 1357 send_data(instr, outstr, blksize, isdata) 1358 FILE *instr, *outstr; 1359 off_t blksize; 1360 int isdata; 1361 { 1362 int c, filefd, netfd, rval; 1363 char *buf; 1364 1365 transflag = 1; 1366 rval = -1; 1367 buf = NULL; 1368 if (setjmp(urgcatch)) 1369 goto cleanup_send_data; 1370 1371 switch (type) { 1372 1373 case TYPE_A: 1374 /* XXXX: rate limit ascii send (get) */ 1375 (void) alarm(curclass.timeout); 1376 while ((c = getc(instr)) != EOF) { 1377 byte_count++; 1378 if (c == '\n') { 1379 if (ferror(outstr)) 1380 goto data_err; 1381 (void) putc('\r', outstr); 1382 if (isdata) { 1383 total_data_out++; 1384 total_data++; 1385 } 1386 total_bytes_out++; 1387 total_bytes++; 1388 } 1389 (void) putc(c, outstr); 1390 if (isdata) { 1391 total_data_out++; 1392 total_data++; 1393 } 1394 total_bytes_out++; 1395 total_bytes++; 1396 if ((byte_count % 4096) == 0) 1397 (void) alarm(curclass.timeout); 1398 } 1399 (void) alarm(0); 1400 fflush(outstr); 1401 if (ferror(instr)) 1402 goto file_err; 1403 if (ferror(outstr)) 1404 goto data_err; 1405 rval = 0; 1406 goto cleanup_send_data; 1407 1408 case TYPE_I: 1409 case TYPE_L: 1410 if ((buf = malloc((size_t)blksize)) == NULL) { 1411 perror_reply(451, "Local resource failure: malloc"); 1412 goto cleanup_send_data; 1413 } 1414 filefd = fileno(instr); 1415 netfd = fileno(outstr); 1416 (void) alarm(curclass.timeout); 1417 if (curclass.rateget) { 1418 while (1) { 1419 int d; 1420 struct timeval then, now, td; 1421 off_t bufrem; 1422 char *bufp; 1423 1424 (void)gettimeofday(&then, NULL); 1425 errno = c = d = 0; 1426 bufrem = curclass.rateget; 1427 while (bufrem > 0) { 1428 if ((c = read(filefd, buf, 1429 MIN(blksize, bufrem))) <= 0) 1430 goto senddone; 1431 (void) alarm(curclass.timeout); 1432 bufrem -= c; 1433 byte_count += c; 1434 if (isdata) { 1435 total_data_out += c; 1436 total_data += c; 1437 } 1438 total_bytes_out += c; 1439 total_bytes += c; 1440 for (bufp = buf; c > 0; 1441 c -= d, bufp += d) 1442 if ((d = 1443 write(netfd, bufp, c)) <= 0) 1444 break; 1445 if (d < 0) 1446 goto data_err; 1447 } 1448 (void)gettimeofday(&now, NULL); 1449 timersub(&now, &then, &td); 1450 if (td.tv_sec > 0) 1451 break; 1452 usleep(1000000 - td.tv_usec); 1453 } 1454 } else { 1455 while ((c = read(filefd, buf, (size_t)blksize)) > 0) { 1456 if (write(netfd, buf, c) != c) 1457 goto data_err; 1458 (void) alarm(curclass.timeout); 1459 byte_count += c; 1460 if (isdata) { 1461 total_data_out += c; 1462 total_data += c; 1463 } 1464 total_bytes_out += c; 1465 total_bytes += c; 1466 } 1467 } 1468 senddone: 1469 if (c < 0) 1470 goto file_err; 1471 rval = 0; 1472 goto cleanup_send_data; 1473 1474 default: 1475 reply(550, "Unimplemented TYPE %d in send_data", type); 1476 goto cleanup_send_data; 1477 } 1478 1479 data_err: 1480 (void) alarm(0); 1481 perror_reply(426, "Data connection"); 1482 goto cleanup_send_data; 1483 1484 file_err: 1485 (void) alarm(0); 1486 perror_reply(551, "Error on input file"); 1487 /* FALLTHROUGH */ 1488 1489 cleanup_send_data: 1490 (void) alarm(0); 1491 transflag = 0; 1492 if (buf) 1493 free(buf); 1494 if (isdata) { 1495 total_files_out++; 1496 total_files++; 1497 } 1498 total_xfers_out++; 1499 total_xfers++; 1500 return (rval); 1501 } 1502 1503 /* 1504 * Transfer data from peer to "outstr" using the appropriate encapulation of 1505 * the data subject to Mode, Structure, and Type. 1506 * 1507 * N.B.: Form isn't handled. 1508 */ 1509 static int 1510 receive_data(instr, outstr) 1511 FILE *instr, *outstr; 1512 { 1513 int c, bare_lfs, netfd, filefd, rval; 1514 char buf[BUFSIZ]; 1515 #ifdef __GNUC__ 1516 (void) &bare_lfs; 1517 #endif 1518 1519 bare_lfs = 0; 1520 transflag = 1; 1521 rval = -1; 1522 if (setjmp(urgcatch)) 1523 goto cleanup_recv_data; 1524 1525 switch (type) { 1526 1527 case TYPE_I: 1528 case TYPE_L: 1529 netfd = fileno(instr); 1530 filefd = fileno(outstr); 1531 (void) alarm(curclass.timeout); 1532 if (curclass.rateput) { 1533 while (1) { 1534 int d; 1535 struct timeval then, now, td; 1536 off_t bufrem; 1537 1538 (void)gettimeofday(&then, NULL); 1539 errno = c = d = 0; 1540 for (bufrem = curclass.rateput; bufrem > 0; ) { 1541 if ((c = read(netfd, buf, 1542 MIN(sizeof(buf), bufrem))) <= 0) 1543 goto recvdone; 1544 if ((d = write(filefd, buf, c)) != c) 1545 goto recvdone; 1546 (void) alarm(curclass.timeout); 1547 bufrem -= c; 1548 byte_count += c; 1549 total_data_in += c; 1550 total_data += c; 1551 total_bytes_in += c; 1552 total_bytes += c; 1553 } 1554 (void)gettimeofday(&now, NULL); 1555 timersub(&now, &then, &td); 1556 if (td.tv_sec > 0) 1557 break; 1558 usleep(1000000 - td.tv_usec); 1559 } 1560 } else { 1561 while ((c = read(netfd, buf, sizeof(buf))) > 0) { 1562 if (write(filefd, buf, c) != c) 1563 goto file_err; 1564 (void) alarm(curclass.timeout); 1565 byte_count += c; 1566 total_data_in += c; 1567 total_data += c; 1568 total_bytes_in += c; 1569 total_bytes += c; 1570 } 1571 } 1572 recvdone: 1573 if (c < 0) 1574 goto data_err; 1575 rval = 0; 1576 goto cleanup_recv_data; 1577 1578 case TYPE_E: 1579 reply(553, "TYPE E not implemented."); 1580 goto cleanup_recv_data; 1581 1582 case TYPE_A: 1583 (void) alarm(curclass.timeout); 1584 /* XXXX: rate limit ascii receive (put) */ 1585 while ((c = getc(instr)) != EOF) { 1586 byte_count++; 1587 total_data_in++; 1588 total_data++; 1589 total_bytes_in++; 1590 total_bytes++; 1591 if ((byte_count % 4096) == 0) 1592 (void) alarm(curclass.timeout); 1593 if (c == '\n') 1594 bare_lfs++; 1595 while (c == '\r') { 1596 if (ferror(outstr)) 1597 goto data_err; 1598 if ((c = getc(instr)) != '\n') { 1599 byte_count++; 1600 total_data_in++; 1601 total_data++; 1602 total_bytes_in++; 1603 total_bytes++; 1604 if ((byte_count % 4096) == 0) 1605 (void) alarm(curclass.timeout); 1606 (void) putc ('\r', outstr); 1607 if (c == '\0' || c == EOF) 1608 goto contin2; 1609 } 1610 } 1611 (void) putc(c, outstr); 1612 contin2: ; 1613 } 1614 (void) alarm(0); 1615 fflush(outstr); 1616 if (ferror(instr)) 1617 goto data_err; 1618 if (ferror(outstr)) 1619 goto file_err; 1620 if (bare_lfs) { 1621 lreply(226, 1622 "WARNING! %d bare linefeeds received in ASCII mode", 1623 bare_lfs); 1624 lreply(0, "File may not have transferred correctly."); 1625 } 1626 rval = 0; 1627 goto cleanup_recv_data; 1628 1629 default: 1630 reply(550, "Unimplemented TYPE %d in receive_data", type); 1631 goto cleanup_recv_data; 1632 } 1633 1634 data_err: 1635 (void) alarm(0); 1636 perror_reply(426, "Data Connection"); 1637 goto cleanup_recv_data; 1638 1639 file_err: 1640 (void) alarm(0); 1641 perror_reply(452, "Error writing file"); 1642 goto cleanup_recv_data; 1643 1644 cleanup_recv_data: 1645 (void) alarm(0); 1646 transflag = 0; 1647 total_files_in++; 1648 total_files++; 1649 total_xfers_in++; 1650 total_xfers++; 1651 return (rval); 1652 } 1653 1654 void 1655 statfilecmd(filename) 1656 const char *filename; 1657 { 1658 FILE *fin; 1659 int c; 1660 char *argv[] = { INTERNAL_LS, "-lgA", "", NULL }; 1661 1662 argv[2] = (char *)filename; 1663 fin = ftpd_popen(argv, "r", STDOUT_FILENO); 1664 lreply(211, "status of %s:", filename); 1665 while ((c = getc(fin)) != EOF) { 1666 if (c == '\n') { 1667 if (ferror(stdout)){ 1668 perror_reply(421, "control connection"); 1669 (void) ftpd_pclose(fin); 1670 dologout(1); 1671 /* NOTREACHED */ 1672 } 1673 if (ferror(fin)) { 1674 perror_reply(551, filename); 1675 (void) ftpd_pclose(fin); 1676 return; 1677 } 1678 (void) putchar('\r'); 1679 total_bytes++; 1680 total_bytes_out++; 1681 } 1682 (void) putchar(c); 1683 total_bytes++; 1684 total_bytes_out++; 1685 } 1686 (void) ftpd_pclose(fin); 1687 reply(211, "End of Status"); 1688 } 1689 1690 void 1691 statcmd() 1692 { 1693 union sockunion *su = NULL; 1694 static char ntop_buf[INET6_ADDRSTRLEN]; 1695 u_char *a, *p; 1696 int ispassive; 1697 off_t b, otbi, otbo, otb; 1698 1699 a = p = (u_char *)NULL; 1700 1701 lreply(211, "%s FTP server status:", hostname); 1702 lreply(0, "Version: %s", FTPD_VERSION); 1703 ntop_buf[0] = '\0'; 1704 if (!getnameinfo((struct sockaddr *)&his_addr, his_addr.su_len, 1705 ntop_buf, sizeof(ntop_buf), NULL, 0, NI_NUMERICHOST) 1706 && strcmp(remotehost, ntop_buf) != 0) { 1707 lreply(0, "Connected to %s (%s)", remotehost, ntop_buf); 1708 } else 1709 lreply(0, "Connected to %s", remotehost); 1710 if (logged_in) { 1711 if (curclass.type == CLASS_GUEST) 1712 lreply(0, "Logged in anonymously"); 1713 else 1714 lreply(0, "Logged in as %s%s", pw->pw_name, 1715 curclass.type == CLASS_CHROOT ? " (chroot)" : ""); 1716 } else if (askpasswd) 1717 lreply(0, "Waiting for password"); 1718 else 1719 lreply(0, "Waiting for user name"); 1720 b = printf(" TYPE: %s", typenames[type]); 1721 total_bytes += b; 1722 total_bytes_out += b; 1723 if (type == TYPE_A || type == TYPE_E) { 1724 b = printf(", FORM: %s", formnames[form]); 1725 total_bytes += b; 1726 total_bytes_out += b; 1727 } 1728 if (type == TYPE_L) { 1729 #if NBBY == 8 1730 b = printf(" %d", NBBY); 1731 #else 1732 /* XXX: `bytesize' needs to be defined in this case */ 1733 b = printf(" %d", bytesize); 1734 #endif 1735 total_bytes += b; 1736 total_bytes_out += b; 1737 } 1738 b = printf("; STRUcture: %s; transfer MODE: %s\r\n", 1739 strunames[stru], modenames[mode]); 1740 total_bytes += b; 1741 total_bytes_out += b; 1742 ispassive = 0; 1743 if (data != -1) { 1744 lreply(0, "Data connection open"); 1745 su = NULL; 1746 } else if (pdata != -1) { 1747 b = printf(" in Passive mode"); 1748 total_bytes += b; 1749 total_bytes_out += b; 1750 su = (union sockunion *)&pasv_addr; 1751 ispassive = 1; 1752 goto printaddr; 1753 } else if (usedefault == 0) { 1754 if (epsvall) { 1755 b = printf("211- EPSV only mode (EPSV ALL )\r\n"); 1756 total_bytes += b; 1757 total_bytes_out += b; 1758 goto epsvonly; 1759 } 1760 b = printf("211- %s", 1761 (data_dest.su_family == AF_INET) ? "PORT" : "LPRT"); 1762 total_bytes += b; 1763 total_bytes_out += b; 1764 su = (union sockunion *)&data_dest; 1765 printaddr: 1766 /* PASV/PORT */ 1767 if (su->su_family == AF_INET) { 1768 if (ispassive) 1769 b = printf("211- PASV "); 1770 else 1771 b = printf("211- PORT "); 1772 a = (u_char *) &su->su_sin.sin_addr; 1773 p = (u_char *) &su->su_sin.sin_port; 1774 #define UC(b) (((int) b) & 0xff) 1775 b += printf("(%d,%d,%d,%d,%d,%d)\r\n", 1776 UC(a[0]), UC(a[1]), UC(a[2]), UC(a[3]), 1777 UC(p[0]), UC(p[1])); 1778 total_bytes += b; 1779 total_bytes_out += b; 1780 } 1781 1782 /* LPSV/LPRT */ 1783 { 1784 int alen, af, i; 1785 1786 alen = 0; 1787 switch (su->su_family) { 1788 case AF_INET: 1789 a = (u_char *) &su->su_sin.sin_addr; 1790 p = (u_char *) &su->su_sin.sin_port; 1791 alen = sizeof(su->su_sin.sin_addr); 1792 af = 4; 1793 break; 1794 case AF_INET6: 1795 a = (u_char *) &su->su_sin6.sin6_addr; 1796 p = (u_char *) &su->su_sin6.sin6_port; 1797 alen = sizeof(su->su_sin6.sin6_addr); 1798 af = 6; 1799 break; 1800 default: 1801 af = 0; 1802 break; 1803 } 1804 if (af) { 1805 if (ispassive) 1806 b = printf("211- LPSV "); 1807 else 1808 b = printf("211- LPRT "); 1809 printf("(%d,%d", af, alen); 1810 for (i = 0; i < alen; i++) 1811 b += printf("%d,", UC(a[alen])); 1812 b += printf("%d,%d,%d)\r\n", 2, UC(p[0]), UC(p[1])); 1813 total_bytes += b; 1814 total_bytes_out += b; 1815 #undef UC 1816 } 1817 } 1818 1819 /* EPRT/EPSV */ 1820 epsvonly:; 1821 { 1822 int af; 1823 1824 switch (su->su_family) { 1825 case AF_INET: 1826 af = 1; 1827 break; 1828 case AF_INET6: 1829 af = 2; 1830 break; 1831 default: 1832 af = 0; 1833 break; 1834 } 1835 if (af) { 1836 if (getnameinfo((struct sockaddr *)su, su->su_len, 1837 ntop_buf, sizeof(ntop_buf), NULL, 0, 1838 NI_NUMERICHOST) == 0) { 1839 if (ispassive) 1840 b = printf("211 - EPSV "); 1841 else 1842 b = printf("211 - EPRT "); 1843 b += printf("(|%d|%s|%d|)\r\n", 1844 af, ntop_buf, ntohs(su->su_port)); 1845 total_bytes += b; 1846 total_bytes_out += b; 1847 } 1848 } 1849 } 1850 } else 1851 lreply(0, "No data connection"); 1852 1853 if (logged_in) { 1854 lreply(0, "Data sent: %qd byte%s in %qd file%s", 1855 (qdfmt_t)total_data_out, PLURAL(total_data_out), 1856 (qdfmt_t)total_files_out, PLURAL(total_files_out)); 1857 lreply(0, "Data received: %qd byte%s in %qd file%s", 1858 (qdfmt_t)total_data_in, PLURAL(total_data_in), 1859 (qdfmt_t)total_files_in, PLURAL(total_files_in)); 1860 lreply(0, "Total data: %qd byte%s in %qd file%s", 1861 (qdfmt_t)total_data, PLURAL(total_data), 1862 (qdfmt_t)total_files, PLURAL(total_files)); 1863 } 1864 otbi = total_bytes_in; 1865 otbo = total_bytes_out; 1866 otb = total_bytes; 1867 lreply(0, "Traffic sent: %qd byte%s in %qd transfer%s", 1868 (qdfmt_t)otbo, PLURAL(otbo), 1869 (qdfmt_t)total_xfers_out, PLURAL(total_xfers_out)); 1870 lreply(0, "Traffic received: %qd byte%s in %qd transfer%s", 1871 (qdfmt_t)otbi, PLURAL(otbi), 1872 (qdfmt_t)total_xfers_in, PLURAL(total_xfers_in)); 1873 lreply(0, "Total traffic: %qd byte%s in %qd transfer%s", 1874 (qdfmt_t)otb, PLURAL(otb), 1875 (qdfmt_t)total_xfers, PLURAL(total_xfers)); 1876 1877 if (logged_in) { 1878 struct ftpconv *cp; 1879 1880 lreply(0, ""); 1881 lreply(0, "Class: %s, type: %s", 1882 curclass.classname, CURCLASSTYPE); 1883 lreply(0, "Check PORT/LPRT commands: %sabled", 1884 curclass.checkportcmd ? "en" : "dis"); 1885 if (curclass.display != NULL) 1886 lreply(0, "Display file: %s", curclass.display); 1887 if (curclass.notify != NULL) 1888 lreply(0, "Notify fileglob: %s", curclass.notify); 1889 lreply(0, "Idle timeout: %d, maximum timeout: %d", 1890 curclass.timeout, curclass.maxtimeout); 1891 lreply(0, "Current connections: %d", connections); 1892 if (curclass.limit == -1) 1893 lreply(0, "Maximum connections: unlimited"); 1894 else 1895 lreply(0, "Maximum connections: %d", curclass.limit); 1896 if (curclass.limitfile) 1897 lreply(0, "Connection limit exceeded file: %s", 1898 curclass.limitfile); 1899 if (curclass.motd != NULL) 1900 lreply(0, "MotD file: %s", curclass.motd); 1901 lreply(0, 1902 "Modify commands (CHMOD, DELE, MKD, RMD, RNFR, UMASK): %sabled", 1903 curclass.modify ? "en" : "dis"); 1904 lreply(0, 1905 "Upload commands (APPE, STOR, STOU): %sabled", 1906 curclass.upload ? "en" : "dis"); 1907 if (curclass.portmin && curclass.portmax) 1908 lreply(0, "PASV port range: %d - %d", 1909 curclass.portmin, curclass.portmax); 1910 if (curclass.rateget) 1911 lreply(0, "Rate get limit: %d bytes/sec", 1912 curclass.rateget); 1913 else 1914 lreply(0, "Rate get limit: disabled"); 1915 if (curclass.rateput) 1916 lreply(0, "Rate put limit: %d bytes/sec", 1917 curclass.rateput); 1918 else 1919 lreply(0, "Rate put limit: disabled"); 1920 lreply(0, "Umask: %.04o", curclass.umask); 1921 for (cp = curclass.conversions; cp != NULL; cp=cp->next) { 1922 if (cp->suffix == NULL || cp->types == NULL || 1923 cp->command == NULL) 1924 continue; 1925 lreply(0, 1926 "Conversion: %s [%s] disable: %s, command: %s", 1927 cp->suffix, cp->types, cp->disable, cp->command); 1928 } 1929 } 1930 1931 reply(211, "End of status"); 1932 } 1933 1934 void 1935 fatal(s) 1936 const char *s; 1937 { 1938 1939 reply(451, "Error in server: %s\n", s); 1940 reply(221, "Closing connection due to server error."); 1941 dologout(0); 1942 /* NOTREACHED */ 1943 } 1944 1945 void 1946 #ifdef __STDC__ 1947 reply(int n, const char *fmt, ...) 1948 #else 1949 reply(n, fmt, va_alist) 1950 int n; 1951 char *fmt; 1952 va_dcl 1953 #endif 1954 { 1955 off_t b; 1956 va_list ap; 1957 #ifdef __STDC__ 1958 va_start(ap, fmt); 1959 #else 1960 va_start(ap); 1961 #endif 1962 b = 0; 1963 b += printf("%d ", n); 1964 b += vprintf(fmt, ap); 1965 b += printf("\r\n"); 1966 total_bytes += b; 1967 total_bytes_out += b; 1968 (void)fflush(stdout); 1969 if (debug) { 1970 syslog(LOG_DEBUG, "<--- %d ", n); 1971 vsyslog(LOG_DEBUG, fmt, ap); 1972 } 1973 } 1974 1975 void 1976 #ifdef __STDC__ 1977 lreply(int n, const char *fmt, ...) 1978 #else 1979 lreply(n, fmt, va_alist) 1980 int n; 1981 char *fmt; 1982 va_dcl 1983 #endif 1984 { 1985 off_t b; 1986 va_list ap; 1987 #ifdef __STDC__ 1988 va_start(ap, fmt); 1989 #else 1990 va_start(ap); 1991 #endif 1992 b = 0; 1993 switch (n) { 1994 case 0: 1995 b += printf(" "); 1996 case -1: 1997 break; 1998 default: 1999 b += printf("%d-", n); 2000 break; 2001 } 2002 b += vprintf(fmt, ap); 2003 b += printf("\r\n"); 2004 total_bytes += b; 2005 total_bytes_out += b; 2006 (void)fflush(stdout); 2007 if (debug) { 2008 syslog(LOG_DEBUG, "<--- %d- ", n); 2009 vsyslog(LOG_DEBUG, fmt, ap); 2010 } 2011 } 2012 2013 static void 2014 ack(s) 2015 const char *s; 2016 { 2017 2018 reply(250, "%s command successful.", s); 2019 } 2020 2021 void 2022 delete(name) 2023 const char *name; 2024 { 2025 char *p = NULL; 2026 2027 if (remove(name) < 0) { 2028 p = strerror(errno); 2029 perror_reply(550, name); 2030 } else 2031 ack("DELE"); 2032 logcmd("delete", -1, name, NULL, NULL, p); 2033 } 2034 2035 void 2036 cwd(path) 2037 const char *path; 2038 { 2039 2040 if (chdir(path) < 0) 2041 perror_reply(550, path); 2042 else { 2043 show_chdir_messages(250); 2044 ack("CWD"); 2045 } 2046 } 2047 2048 static void 2049 replydirname(name, message) 2050 const char *name, *message; 2051 { 2052 char npath[MAXPATHLEN]; 2053 int i; 2054 2055 for (i = 0; *name != '\0' && i < sizeof(npath) - 1; i++, name++) { 2056 npath[i] = *name; 2057 if (*name == '"') 2058 npath[++i] = '"'; 2059 } 2060 npath[i] = '\0'; 2061 reply(257, "\"%s\" %s", npath, message); 2062 } 2063 2064 void 2065 makedir(name) 2066 const char *name; 2067 { 2068 char *p = NULL; 2069 2070 if (mkdir(name, 0777) < 0) { 2071 p = strerror(errno); 2072 perror_reply(550, name); 2073 } else 2074 replydirname(name, "directory created."); 2075 logcmd("mkdir", -1, name, NULL, NULL, p); 2076 } 2077 2078 void 2079 removedir(name) 2080 const char *name; 2081 { 2082 char *p = NULL; 2083 2084 if (rmdir(name) < 0) { 2085 p = strerror(errno); 2086 perror_reply(550, name); 2087 } else 2088 ack("RMD"); 2089 logcmd("rmdir", -1, name, NULL, NULL, p); 2090 } 2091 2092 void 2093 pwd() 2094 { 2095 char path[MAXPATHLEN]; 2096 2097 if (getcwd(path, sizeof(path) - 1) == NULL) 2098 reply(550, "Can't get the current directory: %s.", 2099 strerror(errno)); 2100 else 2101 replydirname(path, "is the current directory."); 2102 } 2103 2104 char * 2105 renamefrom(name) 2106 char *name; 2107 { 2108 struct stat st; 2109 2110 if (stat(name, &st) < 0) { 2111 perror_reply(550, name); 2112 return (NULL); 2113 } 2114 reply(350, "File exists, ready for destination name"); 2115 return (xstrdup(name)); 2116 } 2117 2118 void 2119 renamecmd(from, to) 2120 const char *from, *to; 2121 { 2122 char *p = NULL; 2123 2124 if (rename(from, to) < 0) { 2125 p = strerror(errno); 2126 perror_reply(550, "rename"); 2127 } else 2128 ack("RNTO"); 2129 logcmd("rename", -1, from, to, NULL, p); 2130 } 2131 2132 static void 2133 dolog(who) 2134 struct sockaddr *who; 2135 { 2136 getnameinfo(who, who->sa_len, remotehost, sizeof(remotehost), NULL,0,0); 2137 #ifdef HASSETPROCTITLE 2138 snprintf(proctitle, sizeof(proctitle), "%s: connected", remotehost); 2139 setproctitle(proctitle); 2140 #endif /* HASSETPROCTITLE */ 2141 if (logging) 2142 syslog(LOG_INFO, "connection from %s to %s", 2143 remotehost, hostname); 2144 } 2145 2146 /* 2147 * Record logout in wtmp file 2148 * and exit with supplied status. 2149 */ 2150 void 2151 dologout(status) 2152 int status; 2153 { 2154 /* 2155 * Prevent reception of SIGURG from resulting in a resumption 2156 * back to the main program loop. 2157 */ 2158 transflag = 0; 2159 2160 if (logged_in) { 2161 (void) seteuid((uid_t)0); 2162 logwtmp(ttyline, "", ""); 2163 if (doutmp) 2164 logout(utmp.ut_line); 2165 #ifdef KERBEROS 2166 if (!notickets && krbtkfile_env) 2167 unlink(krbtkfile_env); 2168 #endif 2169 } 2170 /* beware of flushing buffers after a SIGPIPE */ 2171 _exit(status); 2172 } 2173 2174 static void 2175 myoob(signo) 2176 int signo; 2177 { 2178 char *cp; 2179 2180 /* only process if transfer occurring */ 2181 if (!transflag) 2182 return; 2183 cp = tmpline; 2184 if (getline(cp, 7, stdin) == NULL) { 2185 reply(221, "You could at least say goodbye."); 2186 dologout(0); 2187 } 2188 if (strcasecmp(cp, "ABOR\r\n") == 0) { 2189 tmpline[0] = '\0'; 2190 reply(426, "Transfer aborted. Data connection closed."); 2191 reply(226, "Abort successful"); 2192 longjmp(urgcatch, 1); 2193 } 2194 if (strcasecmp(cp, "STAT\r\n") == 0) { 2195 tmpline[0] = '\0'; 2196 if (file_size != (off_t) -1) 2197 reply(213, "Status: %qd of %qd byte%s transferred", 2198 (qdfmt_t)byte_count, (qdfmt_t)file_size, 2199 PLURAL(byte_count)); 2200 else 2201 reply(213, "Status: %qd byte%s transferred", 2202 (qdfmt_t)byte_count, PLURAL(byte_count)); 2203 } 2204 } 2205 2206 static int 2207 bind_pasv_addr() 2208 { 2209 static int passiveport; 2210 int port, len; 2211 2212 len = pasv_addr.su_len; 2213 if (curclass.portmin == 0 && curclass.portmax == 0) { 2214 pasv_addr.su_port = 0; 2215 return (bind(pdata, (struct sockaddr *)&pasv_addr, len)); 2216 } 2217 2218 if (passiveport == 0) { 2219 srand(getpid()); 2220 passiveport = rand() % (curclass.portmax - curclass.portmin) 2221 + curclass.portmin; 2222 } 2223 2224 port = passiveport; 2225 while (1) { 2226 port++; 2227 if (port > curclass.portmax) 2228 port = curclass.portmin; 2229 else if (port == passiveport) { 2230 errno = EAGAIN; 2231 return (-1); 2232 } 2233 pasv_addr.su_port = htons(port); 2234 if (bind(pdata, (struct sockaddr *)&pasv_addr, len) == 0) 2235 break; 2236 if (errno != EADDRINUSE) 2237 return (-1); 2238 } 2239 passiveport = port; 2240 return (0); 2241 } 2242 2243 /* 2244 * Note: a response of 425 is not mentioned as a possible response to 2245 * the PASV command in RFC959. However, it has been blessed as 2246 * a legitimate response by Jon Postel in a telephone conversation 2247 * with Rick Adams on 25 Jan 89. 2248 */ 2249 void 2250 passive() 2251 { 2252 int len; 2253 char *p, *a; 2254 2255 if (pdata >= 0) 2256 close(pdata); 2257 pdata = socket(AF_INET, SOCK_STREAM, 0); 2258 if (pdata < 0 || !logged_in) { 2259 perror_reply(425, "Can't open passive connection"); 2260 return; 2261 } 2262 pasv_addr = ctrl_addr; 2263 2264 if (bind_pasv_addr() < 0) 2265 goto pasv_error; 2266 len = pasv_addr.su_len; 2267 if (getsockname(pdata, (struct sockaddr *) &pasv_addr, &len) < 0) 2268 goto pasv_error; 2269 if (listen(pdata, 1) < 0) 2270 goto pasv_error; 2271 a = (char *) &pasv_addr.su_sin.sin_addr; 2272 p = (char *) &pasv_addr.su_port; 2273 2274 #define UC(b) (((int) b) & 0xff) 2275 2276 reply(227, "Entering Passive Mode (%d,%d,%d,%d,%d,%d)", UC(a[0]), 2277 UC(a[1]), UC(a[2]), UC(a[3]), UC(p[0]), UC(p[1])); 2278 return; 2279 2280 pasv_error: 2281 (void) close(pdata); 2282 pdata = -1; 2283 perror_reply(425, "Can't open passive connection"); 2284 return; 2285 } 2286 2287 /* 2288 * 228 Entering Long Passive Mode (af, hal, h1, h2, h3,..., pal, p1, p2...) 2289 * 229 Entering Extended Passive Mode (|||port|) 2290 */ 2291 void 2292 long_passive(char *cmd, int pf) 2293 { 2294 int len; 2295 char *p, *a; 2296 2297 if (!logged_in) { 2298 syslog(LOG_NOTICE, "long passive but not logged in"); 2299 reply(503, "Login with USER first."); 2300 return; 2301 } 2302 2303 if (pf != PF_UNSPEC) { 2304 if (ctrl_addr.su_family != pf) { 2305 switch (ctrl_addr.su_family) { 2306 case AF_INET: 2307 pf = 1; 2308 break; 2309 case AF_INET6: 2310 pf = 2; 2311 break; 2312 default: 2313 pf = 0; 2314 break; 2315 } 2316 /* 2317 * XXX 2318 * only EPRT/EPSV ready clients will understand this 2319 */ 2320 if (strcmp(cmd, "EPSV") == 0 && pf) { 2321 reply(522, "Network protocol mismatch, " 2322 "use (%d)", pf); 2323 } else 2324 reply(501, "Network protocol mismatch"); /*XXX*/ 2325 2326 return; 2327 } 2328 } 2329 2330 if (pdata >= 0) 2331 close(pdata); 2332 pdata = socket(ctrl_addr.su_family, SOCK_STREAM, 0); 2333 if (pdata < 0) { 2334 perror_reply(425, "Can't open passive connection"); 2335 return; 2336 } 2337 pasv_addr = ctrl_addr; 2338 if (bind_pasv_addr() < 0) 2339 goto pasv_error; 2340 len = pasv_addr.su_len; 2341 if (getsockname(pdata, (struct sockaddr *) &pasv_addr, &len) < 0) 2342 goto pasv_error; 2343 if (listen(pdata, 1) < 0) 2344 goto pasv_error; 2345 p = (char *) &pasv_addr.su_port; 2346 2347 #define UC(b) (((int) b) & 0xff) 2348 2349 if (strcmp(cmd, "LPSV") == 0) { 2350 switch (pasv_addr.su_family) { 2351 case AF_INET: 2352 a = (char *) &pasv_addr.su_sin.sin_addr; 2353 reply(228, "Entering Long Passive Mode (%d,%d,%d,%d,%d,%d,%d,%d,%d)", 2354 4, 4, UC(a[0]), UC(a[1]), UC(a[2]), UC(a[3]), 2355 2, UC(p[0]), UC(p[1])); 2356 return; 2357 case AF_INET6: 2358 a = (char *) &pasv_addr.su_sin6.sin6_addr; 2359 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)", 2360 6, 16, 2361 UC(a[0]), UC(a[1]), UC(a[2]), UC(a[3]), 2362 UC(a[4]), UC(a[5]), UC(a[6]), UC(a[7]), 2363 UC(a[8]), UC(a[9]), UC(a[10]), UC(a[11]), 2364 UC(a[12]), UC(a[13]), UC(a[14]), UC(a[15]), 2365 2, UC(p[0]), UC(p[1])); 2366 return; 2367 } 2368 #undef UC 2369 } else if (strcmp(cmd, "EPSV") == 0) { 2370 switch (pasv_addr.su_family) { 2371 case AF_INET: 2372 case AF_INET6: 2373 reply(229, "Entering Extended Passive Mode (|||%d|)", 2374 ntohs(pasv_addr.su_port)); 2375 return; 2376 } 2377 } else { 2378 /* more proper error code? */ 2379 } 2380 2381 pasv_error: 2382 (void) close(pdata); 2383 pdata = -1; 2384 perror_reply(425, "Can't open passive connection"); 2385 return; 2386 } 2387 2388 /* 2389 * Generate unique name for file with basename "local". 2390 * The file named "local" is already known to exist. 2391 * Generates failure reply on error. 2392 * 2393 * XXX this function should under go changes similar to 2394 * the mktemp(3)/mkstemp(3) changes. 2395 */ 2396 static char * 2397 gunique(local) 2398 const char *local; 2399 { 2400 static char new[MAXPATHLEN]; 2401 struct stat st; 2402 char *cp; 2403 int count; 2404 2405 cp = strrchr(local, '/'); 2406 if (cp) 2407 *cp = '\0'; 2408 if (stat(cp ? local : ".", &st) < 0) { 2409 perror_reply(553, cp ? local : "."); 2410 return (NULL); 2411 } 2412 if (cp) 2413 *cp = '/'; 2414 for (count = 1; count < 100; count++) { 2415 (void)snprintf(new, sizeof(new) - 1, "%s.%d", local, count); 2416 if (stat(new, &st) < 0) 2417 return (new); 2418 } 2419 reply(452, "Unique file name cannot be created."); 2420 return (NULL); 2421 } 2422 2423 /* 2424 * Format and send reply containing system error number. 2425 */ 2426 void 2427 perror_reply(code, string) 2428 int code; 2429 const char *string; 2430 { 2431 int save_errno; 2432 2433 save_errno = errno; 2434 reply(code, "%s: %s.", string, strerror(errno)); 2435 errno = save_errno; 2436 } 2437 2438 static char *onefile[] = { 2439 "", 2440 0 2441 }; 2442 2443 void 2444 send_file_list(whichf) 2445 const char *whichf; 2446 { 2447 struct stat st; 2448 DIR *dirp = NULL; 2449 struct dirent *dir; 2450 FILE *dout = NULL; 2451 char **dirlist, *dirname, *p; 2452 int simple = 0; 2453 int freeglob = 0; 2454 glob_t gl; 2455 off_t b; 2456 2457 #ifdef __GNUC__ 2458 (void) &dout; 2459 (void) &dirlist; 2460 (void) &simple; 2461 (void) &freeglob; 2462 #endif 2463 2464 p = NULL; 2465 if (strpbrk(whichf, "~{[*?") != NULL) { 2466 int flags = GLOB_BRACE|GLOB_NOCHECK|GLOB_TILDE; 2467 2468 memset(&gl, 0, sizeof(gl)); 2469 freeglob = 1; 2470 if (glob(whichf, flags, 0, &gl)) { 2471 reply(550, "not found"); 2472 goto out; 2473 } else if (gl.gl_pathc == 0) { 2474 errno = ENOENT; 2475 perror_reply(550, whichf); 2476 goto out; 2477 } 2478 dirlist = gl.gl_pathv; 2479 } else { 2480 p = xstrdup(whichf); 2481 onefile[0] = p; 2482 dirlist = onefile; 2483 simple = 1; 2484 } 2485 /* XXX: } for vi sm */ 2486 2487 if (setjmp(urgcatch)) { 2488 transflag = 0; 2489 goto out; 2490 } 2491 while ((dirname = *dirlist++) != NULL) { 2492 int trailingslash = 0; 2493 2494 if (stat(dirname, &st) < 0) { 2495 /* 2496 * If user typed "ls -l", etc, and the client 2497 * used NLST, do what the user meant. 2498 */ 2499 /* XXX: nuke this support? */ 2500 if (dirname[0] == '-' && *dirlist == NULL && 2501 transflag == 0) { 2502 char *argv[] = { INTERNAL_LS, "", NULL }; 2503 2504 argv[1] = dirname; 2505 retrieve(argv, dirname); 2506 goto out; 2507 } 2508 perror_reply(550, whichf); 2509 if (dout != NULL) { 2510 (void) fclose(dout); 2511 transflag = 0; 2512 data = -1; 2513 pdata = -1; 2514 } 2515 goto out; 2516 } 2517 2518 if (S_ISREG(st.st_mode)) { 2519 if (dout == NULL) { 2520 dout = dataconn("file list", (off_t)-1, "w"); 2521 if (dout == NULL) 2522 goto out; 2523 transflag++; 2524 } 2525 b = fprintf(dout, "%s%s\n", dirname, 2526 type == TYPE_A ? "\r" : ""); 2527 total_bytes += b; 2528 total_bytes_out += b; 2529 byte_count += strlen(dirname) + 1; 2530 continue; 2531 } else if (!S_ISDIR(st.st_mode)) 2532 continue; 2533 2534 if (dirname[strlen(dirname) - 1] == '/') 2535 trailingslash++; 2536 2537 if ((dirp = opendir(dirname)) == NULL) 2538 continue; 2539 2540 while ((dir = readdir(dirp)) != NULL) { 2541 char nbuf[MAXPATHLEN]; 2542 2543 if (dir->d_name[0] == '.' && dir->d_namlen == 1) 2544 continue; 2545 if (dir->d_name[0] == '.' && dir->d_name[1] == '.' && 2546 dir->d_namlen == 2) 2547 continue; 2548 2549 (void)snprintf(nbuf, sizeof(nbuf), "%s%s%s", dirname, 2550 trailingslash ? "" : "/", dir->d_name); 2551 2552 /* 2553 * We have to do a stat to ensure it's 2554 * not a directory or special file. 2555 */ 2556 /* XXX: follow RFC959 and filter out non files ? */ 2557 if (simple || (stat(nbuf, &st) == 0 && 2558 S_ISREG(st.st_mode))) { 2559 char *p; 2560 2561 if (dout == NULL) { 2562 dout = dataconn("file list", (off_t)-1, 2563 "w"); 2564 if (dout == NULL) 2565 goto out; 2566 transflag++; 2567 } 2568 p = nbuf; 2569 if (nbuf[0] == '.' && nbuf[1] == '/') 2570 p = &nbuf[2]; 2571 b = fprintf(dout, "%s%s\n", p, 2572 type == TYPE_A ? "\r" : ""); 2573 total_bytes += b; 2574 total_bytes_out += b; 2575 byte_count += strlen(nbuf) + 1; 2576 } 2577 } 2578 (void) closedir(dirp); 2579 } 2580 2581 if (dout == NULL) 2582 reply(550, "No files found."); 2583 else if (ferror(dout) != 0) 2584 perror_reply(550, "Data connection"); 2585 else 2586 reply(226, "Transfer complete."); 2587 2588 transflag = 0; 2589 if (dout != NULL) 2590 (void) fclose(dout); 2591 data = -1; 2592 pdata = -1; 2593 out: 2594 total_xfers++; 2595 total_xfers_out++; 2596 if (p) 2597 free(p); 2598 if (freeglob) 2599 globfree(&gl); 2600 } 2601 2602 char * 2603 conffilename(s) 2604 const char *s; 2605 { 2606 static char filename[MAXPATHLEN]; 2607 2608 if (*s == '/') 2609 strlcpy(filename, s, sizeof(filename)); 2610 else 2611 (void)snprintf(filename, sizeof(filename), "%s/%s", confdir ,s); 2612 return (filename); 2613 } 2614 2615 /* 2616 * logcmd -- 2617 * based on the arguments, syslog a message: 2618 * if bytes != -1 "<command> <file1> = <bytes> bytes" 2619 * else if file2 != NULL "<command> <file1> <file2>" 2620 * else "<command> <file1>" 2621 * if elapsed != NULL, append "in xxx.yyy seconds" 2622 * if error != NULL, append ": " + error 2623 */ 2624 2625 void 2626 logcmd(command, bytes, file1, file2, elapsed, error) 2627 const char *command; 2628 off_t bytes; 2629 const char *file1; 2630 const char *file2; 2631 const struct timeval *elapsed; 2632 const char *error; 2633 { 2634 char buf[MAXPATHLEN * 2 + 100], realfile[MAXPATHLEN]; 2635 const char *p; 2636 size_t len; 2637 2638 if (logging <=1) 2639 return; 2640 2641 if ((p = realpath(file1, realfile)) == NULL) { 2642 #if 0 /* XXX: too noisy */ 2643 syslog(LOG_WARNING, "realpath `%s' failed: %s", 2644 realfile, strerror(errno)); 2645 #endif 2646 p = file1; 2647 } 2648 len = snprintf(buf, sizeof(buf), "%s %s", command, p); 2649 2650 if (bytes != (off_t)-1) { 2651 len += snprintf(buf + len, sizeof(buf) - len, 2652 " = %qd byte%s", (qdfmt_t) bytes, PLURAL(bytes)); 2653 } else if (file2 != NULL) { 2654 if ((p = realpath(file2, realfile)) == NULL) { 2655 #if 0 /* XXX: too noisy */ 2656 syslog(LOG_WARNING, "realpath `%s' failed: %s", 2657 realfile, strerror(errno)); 2658 #endif 2659 p = file2; 2660 } 2661 len += snprintf(buf + len, sizeof(buf) - len, " %s", p); 2662 } 2663 2664 if (elapsed != NULL) { 2665 len += snprintf(buf + len, sizeof(buf) - len, 2666 " in %ld.%.03d seconds", elapsed->tv_sec, 2667 (int)(elapsed->tv_usec / 1000)); 2668 } 2669 2670 if (error != NULL) 2671 len += snprintf(buf + len, sizeof(buf) - len, ": %s", error); 2672 2673 syslog(LOG_INFO, "%s", buf); 2674 } 2675 2676 char * 2677 xstrdup(s) 2678 const char *s; 2679 { 2680 char *new = strdup(s); 2681 2682 if (new == NULL) 2683 fatal("Local resource failure: malloc"); 2684 /* NOTREACHED */ 2685 return (new); 2686 } 2687
Indexes created Wed Sep 24 05:09:52 GMT 2025