/* $OpenBSD: ftpd.c,v 1.24 1996/10/19 12:20:02 michaels Exp $ */ /* $NetBSD: ftpd.c,v 1.15 1995/06/03 22:46:47 mycroft Exp $ */ /* * Copyright (c) 1985, 1988, 1990, 1992, 1993, 1994 * The Regents of the University of California. All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. All advertising materials mentioning features or use of this software * must display the following acknowledgement: * This product includes software developed by the University of * California, Berkeley and its contributors. * 4. Neither the name of the University nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. */ #ifndef lint static char copyright[] = "@(#) Copyright (c) 1985, 1988, 1990, 1992, 1993, 1994\n\ The Regents of the University of California. All rights reserved.\n"; #endif /* not lint */ #ifndef lint #if 0 static char sccsid[] = "@(#)ftpd.c 8.4 (Berkeley) 4/16/94"; #else static char rcsid[] = "$NetBSD: ftpd.c,v 1.15 1995/06/03 22:46:47 mycroft Exp $"; #endif #endif /* not lint */ /* * FTP server. */ #include #include #include #include #include #include #include #include #include #include #define FTP_NAMES #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include "pathnames.h" #include "extern.h" #if __STDC__ #include #else #include #endif static char version[] = "Version 6.1/OpenBSD"; extern off_t restart_point; extern char cbuf[]; struct sockaddr_in server_addr; struct sockaddr_in ctrl_addr; struct sockaddr_in data_source; struct sockaddr_in data_dest; struct sockaddr_in his_addr; struct sockaddr_in pasv_addr; int daemon_mode = 0; int data; jmp_buf errcatch, urgcatch; int logged_in; struct passwd *pw; int debug = 0; int timeout = 900; /* timeout after 15 minutes of inactivity */ int maxtimeout = 7200;/* don't allow idle time to be set beyond 2 hours */ int logging; int high_data_ports = 0; int multihome = 0; int guest; int stats; int statfd = -1; int dochroot; int type; int form; int stru; /* avoid C keyword */ int mode; int doutmp = 0; /* update utmp file */ int usedefault = 1; /* for data transfers */ int pdata = -1; /* for passive mode */ sig_atomic_t transflag; off_t file_size; off_t byte_count; #if !defined(CMASK) || CMASK == 0 #undef CMASK #define CMASK 027 #endif int defumask = CMASK; /* default umask value */ char tmpline[7]; char hostname[MAXHOSTNAMELEN]; char remotehost[MAXHOSTNAMELEN]; char dhostname[MAXHOSTNAMELEN]; char *guestpw; static char ttyline[20]; char *tty = ttyline; /* for klogin */ static struct utmp utmp; /* for utmp */ #if defined(KERBEROS) int notickets = 1; char *krbtkfile_env = NULL; #endif char *ident = NULL; /* * Timeout intervals for retrying connections * to hosts that don't accept PORT cmds. This * is a kludge, but given the problems with TCP... */ #define SWAITMAX 90 /* wait at most 90 seconds */ #define SWAITINT 5 /* interval between retries */ int swaitmax = SWAITMAX; int swaitint = SWAITINT; #ifdef HASSETPROCTITLE char proctitle[BUFSIZ]; /* initial part of title */ #endif /* HASSETPROCTITLE */ #define LOGCMD(cmd, file) \ if (logging > 1) \ syslog(LOG_INFO,"%s %s%s", cmd, \ *(file) == '/' ? "" : curdir(), file); #define LOGCMD2(cmd, file1, file2) \ if (logging > 1) \ syslog(LOG_INFO,"%s %s%s %s%s", cmd, \ *(file1) == '/' ? "" : curdir(), file1, \ *(file2) == '/' ? "" : curdir(), file2); #define LOGBYTES(cmd, file, cnt) \ if (logging > 1) { \ if (cnt == (off_t)-1) \ syslog(LOG_INFO,"%s %s%s", cmd, \ *(file) == '/' ? "" : curdir(), file); \ else \ syslog(LOG_INFO, "%s %s%s = %qd bytes", \ cmd, (*(file) == '/') ? "" : curdir(), file, cnt); \ } static void ack __P((char *)); static void myoob __P((int)); static int checkuser __P((char *, char *)); static FILE *dataconn __P((char *, off_t, char *)); static void dolog __P((struct sockaddr_in *)); static char *curdir __P((void)); static void end_login __P((void)); static FILE *getdatasock __P((char *)); static char *gunique __P((char *)); static void lostconn __P((int)); static void sigquit __P((int)); static int receive_data __P((FILE *, FILE *)); static void send_data __P((FILE *, FILE *, off_t, off_t, int)); static struct passwd * sgetpwnam __P((char *)); static char *sgetsave __P((char *)); static void reapchild __P((int)); void logxfer __P((char *, off_t, time_t)); static char * curdir() { static char path[MAXPATHLEN+1+1]; /* path + '/' + '\0' */ if (getcwd(path, sizeof(path)-2) == NULL) return (""); if (path[1] != '\0') /* special case for root dir. */ strcat(path, "/"); /* For guest account, skip / since it's chrooted */ return (guest ? path+1 : path); } int main(argc, argv, envp) int argc; char *argv[]; char **envp; { int addrlen, ch, on = 1, tos; char *cp, line[LINE_MAX]; FILE *fd; char *argstr = "dDhlMSt:T:u:Uv"; struct hostent *hp; tzset(); /* in case no timezone database in ~ftp */ /* set this here so klogin can use it... */ (void)snprintf(ttyline, sizeof(ttyline), "ftp%d", getpid()); while ((ch = getopt(argc, argv, argstr)) != EOF) { switch (ch) { case 'd': debug = 1; break; case 'D': daemon_mode = 1; break; case 'h': high_data_ports = 1; break; case 'l': logging++; /* > 1 == extra logging */ break; case 'M': multihome = 1; break; case 'S': stats = 1; break; case 't': timeout = atoi(optarg); if (maxtimeout < timeout) maxtimeout = timeout; break; case 'T': maxtimeout = atoi(optarg); if (timeout > maxtimeout) timeout = maxtimeout; break; case 'u': { long val = 0; val = strtol(optarg, &optarg, 8); if (*optarg != '\0' || val < 0) warnx("bad value for -u"); else defumask = val; break; } case 'U': doutmp = 1; break; case 'v': debug = 1; break; default: warnx("unknown flag -%c ignored", optopt); break; } } (void) freopen(_PATH_DEVNULL, "w", stderr); /* * LOG_NDELAY sets up the logging connection immediately, * necessary for anonymous ftp's that chroot and can't do it later. */ openlog("ftpd", LOG_PID | LOG_NDELAY, LOG_FTP); if (daemon_mode) { int ctl_sock, fd; struct servent *sv; /* * Detach from parent. */ if (daemon(1, 1) < 0) { syslog(LOG_ERR, "failed to become a daemon"); exit(1); } (void) signal(SIGCHLD, reapchild); /* * Get port number for ftp/tcp. */ sv = getservbyname("ftp", "tcp"); if (sv == NULL) { syslog(LOG_ERR, "getservbyname for ftp failed"); exit(1); } /* * Open a socket, bind it to the FTP port, and start * listening. */ ctl_sock = socket(AF_INET, SOCK_STREAM, 0); if (ctl_sock < 0) { syslog(LOG_ERR, "control socket: %m"); exit(1); } if (setsockopt(ctl_sock, SOL_SOCKET, SO_REUSEADDR, (char *)&on, sizeof(on)) < 0) syslog(LOG_ERR, "control setsockopt: %m");; server_addr.sin_family = AF_INET; server_addr.sin_addr.s_addr = INADDR_ANY; server_addr.sin_port = sv->s_port; if (bind(ctl_sock, (struct sockaddr *)&server_addr, sizeof(server_addr))) { syslog(LOG_ERR, "control bind: %m"); exit(1); } if (listen(ctl_sock, 32) < 0) { syslog(LOG_ERR, "control listen: %m"); exit(1); } /* * Loop forever accepting connection requests and forking off * children to handle them. */ while (1) { addrlen = sizeof(his_addr); fd = accept(ctl_sock, (struct sockaddr *)&his_addr, &addrlen); if (fork() == 0) { /* child */ (void) dup2(fd, 0); (void) dup2(fd, 1); close(ctl_sock); break; } close(fd); } } else { addrlen = sizeof(his_addr); if (getpeername(0, (struct sockaddr *)&his_addr, &addrlen) < 0) { syslog(LOG_ERR, "getpeername (%s): %m", argv[0]); exit(1); } } (void) signal(SIGHUP, sigquit); (void) signal(SIGINT, sigquit); (void) signal(SIGQUIT, sigquit); (void) signal(SIGTERM, sigquit); (void) signal(SIGPIPE, lostconn); (void) signal(SIGCHLD, SIG_IGN); if ((long)signal(SIGURG, myoob) < 0) syslog(LOG_ERR, "signal: %m"); addrlen = sizeof(ctrl_addr); if (getsockname(0, (struct sockaddr *)&ctrl_addr, &addrlen) < 0) { syslog(LOG_ERR, "getsockname (%s): %m", argv[0]); exit(1); } #ifdef IP_TOS tos = IPTOS_LOWDELAY; if (setsockopt(0, IPPROTO_IP, IP_TOS, (char *)&tos, sizeof(int)) < 0) syslog(LOG_WARNING, "setsockopt (IP_TOS): %m"); #endif data_source.sin_port = htons(ntohs(ctrl_addr.sin_port) - 1); /* Try to handle urgent data inline */ #ifdef SO_OOBINLINE if (setsockopt(0, SOL_SOCKET, SO_OOBINLINE, (char *)&on, sizeof(on)) < 0) syslog(LOG_ERR, "setsockopt: %m"); #endif #ifdef F_SETOWN if (fcntl(fileno(stdin), F_SETOWN, getpid()) == -1) syslog(LOG_ERR, "fcntl F_SETOWN: %m"); #endif dolog(&his_addr); /* * Set up default state */ data = -1; type = TYPE_A; form = FORM_N; stru = STRU_F; mode = MODE_S; tmpline[0] = '\0'; /* If logins are disabled, print out the message. */ if ((fd = fopen(_PATH_NOLOGIN,"r")) != NULL) { while (fgets(line, sizeof(line), fd) != NULL) { if ((cp = strchr(line, '\n')) != NULL) *cp = '\0'; lreply(530, "%s", line); } (void) fflush(stdout); (void) fclose(fd); reply(530, "System not available."); exit(0); } if ((fd = fopen(_PATH_FTPWELCOME, "r")) != NULL) { while (fgets(line, sizeof(line), fd) != NULL) { if ((cp = strchr(line, '\n')) != NULL) *cp = '\0'; lreply(220, "%s", line); } (void) fflush(stdout); (void) fclose(fd); /* reply(220,) must follow */ } (void) gethostname(hostname, sizeof(hostname)); /* Make sure hostname is fully qualified. */ hp = gethostbyname(hostname); if (hp != NULL) strcpy (hostname, hp->h_name); if (multihome) { hp = gethostbyaddr((char *) &ctrl_addr.sin_addr, sizeof (struct in_addr), AF_INET); if (hp != NULL) { strcpy (dhostname, hp->h_name); } else { /* Default. */ strcpy (dhostname, inet_ntoa(ctrl_addr.sin_addr)); } } reply(220, "%s FTP server (%s) ready.", (multihome ? dhostname : hostname), version); (void) setjmp(errcatch); for (;;) (void) yyparse(); /* NOTREACHED */ } /* * Signal handlers. */ static void lostconn(signo) int signo; { if (debug) syslog(LOG_DEBUG, "lost connection"); dologout(-1); } static void sigquit(signo) int signo; { syslog(LOG_ERR, "got signal %s", strsignal(signo)); dologout(-1); } /* * Helper function for sgetpwnam(). */ static char * sgetsave(s) char *s; { char *new = malloc((unsigned) strlen(s) + 1); if (new == NULL) { perror_reply(421, "Local resource failure: malloc"); dologout(1); /* NOTREACHED */ } (void) strcpy(new, s); return (new); } /* * Save the result of a getpwnam. Used for USER command, since * the data returned must not be clobbered by any other command * (e.g., globbing). */ static struct passwd * sgetpwnam(name) char *name; { static struct passwd save; struct passwd *p; if ((p = getpwnam(name)) == NULL) return (p); if (save.pw_name) { free(save.pw_name); memset(save.pw_passwd, 0, strlen(save.pw_passwd)); free(save.pw_passwd); free(save.pw_gecos); free(save.pw_dir); free(save.pw_shell); } save = *p; save.pw_name = sgetsave(p->pw_name); save.pw_passwd = sgetsave(p->pw_passwd); save.pw_gecos = sgetsave(p->pw_gecos); save.pw_dir = sgetsave(p->pw_dir); save.pw_shell = sgetsave(p->pw_shell); return (&save); } static int login_attempts; /* number of failed login attempts */ static int askpasswd; /* had user command, ask for passwd */ static char curname[16]; /* current USER name */ /* * USER command. * Sets global passwd pointer pw if named account exists and is acceptable; * sets askpasswd if a PASS command is expected. If logged in previously, * need to reset state. If name is "ftp" or "anonymous", the name is not in * _PATH_FTPUSERS, and ftp account exists, set guest and pw, then just return. * If account doesn't exist, ask for passwd anyway. Otherwise, check user * requesting login privileges. Disallow anyone who does not have a standard * shell as returned by getusershell(). Disallow anyone mentioned in the file * _PATH_FTPUSERS to allow people such as root and uucp to be avoided. */ void user(name) char *name; { char *cp, *shell; if (logged_in) { if (guest) { reply(530, "Can't change user from guest login."); return; } else if (dochroot) { reply(530, "Can't change user from chroot user."); return; } end_login(); } guest = 0; if (strcmp(name, "ftp") == 0 || strcmp(name, "anonymous") == 0) { if (checkuser(_PATH_FTPUSERS, "ftp") || checkuser(_PATH_FTPUSERS, "anonymous")) reply(530, "User %s access denied.", name); else if ((pw = sgetpwnam("ftp")) != NULL) { guest = 1; askpasswd = 1; reply(331, "Guest login ok, type your name as password."); } else reply(530, "User %s unknown.", name); if (!askpasswd && logging) syslog(LOG_NOTICE, "ANONYMOUS FTP LOGIN REFUSED FROM %s", remotehost); return; } if (pw = sgetpwnam(name)) { if ((shell = pw->pw_shell) == NULL || *shell == 0) shell = _PATH_BSHELL; while ((cp = getusershell()) != NULL) if (strcmp(cp, shell) == 0) break; endusershell(); if (cp == NULL || checkuser(_PATH_FTPUSERS, name)) { reply(530, "User %s access denied.", name); if (logging) syslog(LOG_NOTICE, "FTP LOGIN REFUSED FROM %s, %s", remotehost, name); pw = (struct passwd *) NULL; return; } } if (logging) { strncpy(curname, name, sizeof(curname)-1); curname[sizeof(curname)-1] = '\0'; } #ifdef SKEY if (!skey_haskey(name)) { char *myskey, *skey_keyinfo __P((char *name)); myskey = skey_keyinfo(name); reply(331, "Password [ %s ] for %s required.", myskey ? myskey : "error getting challenge", name); } else #endif reply(331, "Password required for %s.", name); askpasswd = 1; /* * Delay before reading passwd after first failed * attempt to slow down passwd-guessing programs. */ if (login_attempts) sleep((unsigned) login_attempts); } /* * Check if a user is in the file "fname" */ static int checkuser(fname, name) char *fname; char *name; { FILE *fd; int found = 0; char *p, line[BUFSIZ]; if ((fd = fopen(fname, "r")) != NULL) { while (fgets(line, sizeof(line), fd) != NULL) if ((p = strchr(line, '\n')) != NULL) { *p = '\0'; if (line[0] == '#') continue; if (strcmp(line, name) == 0) { found = 1; break; } } (void) fclose(fd); } return (found); } /* * Terminate login as previous user, if any, resetting state; * used when USER command is given or login fails. */ static void end_login() { (void) seteuid((uid_t)0); if (logged_in) { logwtmp(ttyline, "", ""); if (doutmp) logout(utmp.ut_line); } pw = NULL; logged_in = 0; guest = 0; dochroot = 0; } void pass(passwd) char *passwd; { int rval; FILE *fd; static char homedir[MAXPATHLEN]; char rootdir[MAXPATHLEN]; if (logged_in || askpasswd == 0) { reply(503, "Login with USER first."); return; } askpasswd = 0; if (!guest) { /* "ftp" is only account allowed no password */ if (pw == NULL) { rval = 1; /* failure below */ goto skip; } #if defined(KERBEROS) rval = klogin(pw, "", hostname, passwd); if (rval == 0) goto skip; #endif #ifdef SKEY if (skey_haskey(pw->pw_name) == 0 && (skey_passcheck(pw->pw_name, passwd) != -1)) { rval = 0; goto skip; } #endif /* the strcmp does not catch null passwords! */ if (pw == NULL || *pw->pw_passwd == '\0' || strcmp(crypt(passwd, (pw ? pw->pw_passwd : "xx")), pw->pw_passwd)) { rval = 1; /* failure */ goto skip; } rval = 0; skip: /* * If rval == 1, the user failed the authentication check * above. If rval == 0, either Kerberos or local authentication * succeeded. */ if (rval) { reply(530, "Login incorrect."); if (logging) syslog(LOG_NOTICE, "FTP LOGIN FAILED FROM %s, %s", remotehost, curname); pw = NULL; if (login_attempts++ >= 5) { syslog(LOG_NOTICE, "repeated login failures from %s", remotehost); exit(0); } return; } } else { /* Save anonymous' password. */ guestpw = strdup(passwd); if (guestpw == (char *)NULL) fatal("Out of memory"); } login_attempts = 0; /* this time successful */ if (setegid((gid_t)pw->pw_gid) < 0) { reply(550, "Can't set gid."); return; } (void) initgroups(pw->pw_name, pw->pw_gid); /* open wtmp before chroot */ logwtmp(ttyline, pw->pw_name, remotehost); /* open utmp before chroot */ if (doutmp) { memset((void *)&utmp, 0, sizeof(utmp)); (void)time(&utmp.ut_time); (void)strncpy(utmp.ut_name, pw->pw_name, sizeof(utmp.ut_name)); (void)strncpy(utmp.ut_host, remotehost, sizeof(utmp.ut_host)); (void)strncpy(utmp.ut_line, ttyline, sizeof(utmp.ut_line)); login(&utmp); } /* open stats file before chroot */ if (guest && (stats == 1) && (statfd < 0)) if ((statfd = open(_PATH_FTPDSTATFILE, O_WRONLY|O_APPEND)) < 0) stats = 0; logged_in = 1; dochroot = checkuser(_PATH_FTPCHROOT, pw->pw_name); if (guest || dochroot) { if (multihome) { struct stat ts; /* Compute root directory. */ snprintf (rootdir, sizeof(rootdir), "%s/%s", pw->pw_dir, dhostname); if (stat(rootdir, &ts) < 0) { snprintf (rootdir, sizeof(rootdir), "%s/%s", pw->pw_dir, hostname); } } else strcpy (rootdir, pw->pw_dir); } if (guest) { /* * We MUST do a chdir() after the chroot. Otherwise * the old current directory will be accessible as "." * outside the new root! */ if (chroot(rootdir) < 0 || chdir("/") < 0) { reply(550, "Can't set guest privileges."); goto bad; } strcpy(pw->pw_dir, "/"); setenv("HOME", "/", 1); } else if (dochroot) { if (chroot(rootdir) < 0 || chdir("/") < 0) { reply(550, "Can't change root."); goto bad; } strcpy(pw->pw_dir, "/"); setenv("HOME", "/", 1); } else if (chdir(pw->pw_dir) < 0) { if (chdir("/") < 0) { reply(530, "User %s: can't change directory to %s.", pw->pw_name, pw->pw_dir); goto bad; } else lreply(230, "No directory! Logging in with home=/"); } if (seteuid((uid_t)pw->pw_uid) < 0) { reply(550, "Can't set uid."); goto bad; } /* * Set home directory so that use of ~ (tilde) works correctly. */ if (getcwd(homedir, MAXPATHLEN) != NULL) setenv("HOME", homedir, 1); /* * Display a login message, if it exists. * N.B. reply(230,) must follow the message. */ if ((fd = fopen(_PATH_FTPLOGINMESG, "r")) != NULL) { char *cp, line[LINE_MAX]; while (fgets(line, sizeof(line), fd) != NULL) { if ((cp = strchr(line, '\n')) != NULL) *cp = '\0'; lreply(230, "%s", line); } (void) fflush(stdout); (void) fclose(fd); } if (guest) { if (ident != NULL) free(ident); ident = strdup(passwd); if (ident == (char *)NULL) fatal("Ran out of memory."); reply(230, "Guest login ok, access restrictions apply."); #ifdef HASSETPROCTITLE snprintf(proctitle, sizeof(proctitle), "%s: anonymous/%.*s", remotehost, sizeof(proctitle) - sizeof(remotehost) - sizeof(": anonymous/"), passwd); setproctitle(proctitle); #endif /* HASSETPROCTITLE */ if (logging) syslog(LOG_INFO, "ANONYMOUS FTP LOGIN FROM %s, %s", remotehost, passwd); } else { reply(230, "User %s logged in.", pw->pw_name); #ifdef HASSETPROCTITLE snprintf(proctitle, sizeof(proctitle), "%s: %s", remotehost, pw->pw_name); setproctitle(proctitle); #endif /* HASSETPROCTITLE */ if (logging) syslog(LOG_INFO, "FTP LOGIN FROM %s as %s", remotehost, pw->pw_name); } (void) umask(defumask); return; bad: /* Forget all about it... */ end_login(); } void retrieve(cmd, name) char *cmd, *name; { FILE *fin, *dout; struct stat st; int (*closefunc) __P((FILE *)); time_t start; if (cmd == 0) { fin = fopen(name, "r"), closefunc = fclose; st.st_size = 0; } else { char line[BUFSIZ]; (void) snprintf(line, sizeof(line), cmd, name); name = line; fin = ftpd_popen(line, "r"), closefunc = ftpd_pclose; st.st_size = -1; st.st_blksize = BUFSIZ; } if (fin == NULL) { if (errno != 0) { perror_reply(550, name); if (cmd == 0) { LOGCMD("get", name); } } return; } byte_count = -1; if (cmd == 0 && (fstat(fileno(fin), &st) < 0 || !S_ISREG(st.st_mode))) { reply(550, "%s: not a plain file.", name); goto done; } if (restart_point) { if (type == TYPE_A) { off_t i, n; int c; n = restart_point; i = 0; while (i++ < n) { if ((c=getc(fin)) == EOF) { perror_reply(550, name); goto done; } if (c == '\n') i++; } } else if (lseek(fileno(fin), restart_point, L_SET) < 0) { perror_reply(550, name); goto done; } } dout = dataconn(name, st.st_size, "w"); if (dout == NULL) goto done; time(&start); send_data(fin, dout, st.st_blksize, st.st_size, (restart_point == 0 && cmd == 0 && S_ISREG(st.st_mode))); if ((cmd == 0) && stats) logxfer(name, st.st_size, start); (void) fclose(dout); data = -1; pdata = -1; done: if (cmd == 0) LOGBYTES("get", name, byte_count); (*closefunc)(fin); } void store(name, mode, unique) char *name, *mode; int unique; { FILE *fout, *din; struct stat st; int (*closefunc) __P((FILE *)); if (unique && stat(name, &st) == 0 && (name = gunique(name)) == NULL) { LOGCMD(*mode == 'w' ? "put" : "append", name); return; } if (restart_point) mode = "r+"; fout = fopen(name, mode); closefunc = fclose; if (fout == NULL) { perror_reply(553, name); LOGCMD(*mode == 'w' ? "put" : "append", name); return; } byte_count = -1; if (restart_point) { if (type == TYPE_A) { off_t i, n; int c; n = restart_point; i = 0; while (i++ < n) { if ((c=getc(fout)) == EOF) { perror_reply(550, name); goto done; } if (c == '\n') i++; } /* * We must do this seek to "current" position * because we are changing from reading to * writing. */ if (fseek(fout, 0L, L_INCR) < 0) { perror_reply(550, name); goto done; } } else if (lseek(fileno(fout), restart_point, L_SET) < 0) { perror_reply(550, name); goto done; } } din = dataconn(name, (off_t)-1, "r"); if (din == NULL) goto done; if (receive_data(din, fout) == 0) { if (unique) reply(226, "Transfer complete (unique file name:%s).", name); else reply(226, "Transfer complete."); } (void) fclose(din); data = -1; pdata = -1; done: LOGBYTES(*mode == 'w' ? "put" : "append", name, byte_count); (*closefunc)(fout); } static FILE * getdatasock(mode) char *mode; { int on = 1, s, t, tries; if (data >= 0) return (fdopen(data, mode)); (void) seteuid((uid_t)0); s = socket(AF_INET, SOCK_STREAM, 0); if (s < 0) goto bad; if (setsockopt(s, SOL_SOCKET, SO_REUSEADDR, (char *) &on, sizeof(on)) < 0) goto bad; /* anchor socket to avoid multi-homing problems */ data_source.sin_len = sizeof(struct sockaddr_in); data_source.sin_family = AF_INET; data_source.sin_addr = ctrl_addr.sin_addr; for (tries = 1; ; tries++) { if (bind(s, (struct sockaddr *)&data_source, sizeof(data_source)) >= 0) break; if (errno != EADDRINUSE || tries > 10) goto bad; sleep(tries); } (void) seteuid((uid_t)pw->pw_uid); #ifdef IP_TOS on = IPTOS_THROUGHPUT; if (setsockopt(s, IPPROTO_IP, IP_TOS, (char *)&on, sizeof(int)) < 0) syslog(LOG_WARNING, "setsockopt (IP_TOS): %m"); #endif #ifdef TCP_NOPUSH /* * Turn off push flag to keep sender TCP from sending short packets * at the boundaries of each write(). Should probably do a SO_SNDBUF * to set the send buffer size as well, but that may not be desirable * in heavy-load situations. */ on = 1; if (setsockopt(s, IPPROTO_TCP, TCP_NOPUSH, (char *)&on, sizeof on) < 0) syslog(LOG_WARNING, "setsockopt (TCP_NOPUSH): %m"); #endif #ifdef SO_SNDBUF on = 65536; if (setsockopt(s, SOL_SOCKET, SO_SNDBUF, (char *)&on, sizeof on) < 0) syslog(LOG_WARNING, "setsockopt (SO_SNDBUF): %m"); #endif return (fdopen(s, mode)); bad: /* Return the real value of errno (close may change it) */ t = errno; (void) seteuid((uid_t)pw->pw_uid); (void) close(s); errno = t; return (NULL); } static FILE * dataconn(name, size, mode) char *name; off_t size; char *mode; { char sizebuf[32]; FILE *file; int retry = 0, tos; file_size = size; byte_count = 0; if (size != (off_t) -1) { (void) snprintf(sizebuf, sizeof(sizebuf), " (%qd bytes)", size); } else sizebuf[0] = '\0'; if (pdata >= 0) { struct sockaddr_in from; int s, fromlen = sizeof(from); s = accept(pdata, (struct sockaddr *)&from, &fromlen); if (s < 0) { reply(425, "Can't open data connection."); (void) close(pdata); pdata = -1; return (NULL); } if (ntohs(from.sin_port) < IPPORT_RESERVED) { perror_reply(425, "Can't build data connection"); (void) close(pdata); (void) close(s); pdata = -1; return (NULL); } if (from.sin_addr.s_addr != his_addr.sin_addr.s_addr) { perror_reply(435, "Can't build data connection"); (void) close(pdata); (void) close(s); pdata = -1; return (NULL); } (void) close(pdata); pdata = s; #ifdef IP_TOS tos = IPTOS_THROUGHPUT; (void) setsockopt(s, IPPROTO_IP, IP_TOS, (char *)&tos, sizeof(int)); #endif reply(150, "Opening %s mode data connection for '%s'%s.", type == TYPE_A ? "ASCII" : "BINARY", name, sizebuf); return (fdopen(pdata, mode)); } if (data >= 0) { reply(125, "Using existing data connection for '%s'%s.", name, sizebuf); usedefault = 1; return (fdopen(data, mode)); } if (usedefault) data_dest = his_addr; usedefault = 1; file = getdatasock(mode); if (file == NULL) { reply(425, "Can't create data socket (%s,%d): %s.", inet_ntoa(data_source.sin_addr), ntohs(data_source.sin_port), strerror(errno)); return (NULL); } data = fileno(file); /* * attempt to connect to reserved port on client machine; * this looks like an attack */ if (ntohs(data_dest.sin_port) < IPPORT_RESERVED) { perror_reply(425, "Can't build data connection"); (void) fclose(file); data = -1; return NULL; } if (data_dest.sin_addr.s_addr != his_addr.sin_addr.s_addr) { perror_reply(435, "Can't build data connection"); (void) fclose(file); data = -1; return NULL; } while (connect(data, (struct sockaddr *)&data_dest, sizeof(data_dest)) < 0) { if (errno == EADDRINUSE && retry < swaitmax) { sleep((unsigned) swaitint); retry += swaitint; continue; } perror_reply(425, "Can't build data connection"); (void) fclose(file); data = -1; return (NULL); } reply(150, "Opening %s mode data connection for '%s'%s.", type == TYPE_A ? "ASCII" : "BINARY", name, sizebuf); return (file); } /* * Tranfer the contents of "instr" to "outstr" peer using the appropriate * encapsulation of the data subject to Mode, Structure, and Type. * * NB: Form isn't handled. */ static void send_data(instr, outstr, blksize, filesize, isreg) FILE *instr, *outstr; off_t blksize; off_t filesize; int isreg; { int c, cnt, filefd, netfd; char *buf, *bp; size_t len; transflag++; if (setjmp(urgcatch)) { transflag = 0; return; } switch (type) { case TYPE_A: while ((c = getc(instr)) != EOF) { byte_count++; if (c == '\n') { if (ferror(outstr)) goto data_err; (void) putc('\r', outstr); } (void) putc(c, outstr); } fflush(outstr); transflag = 0; if (ferror(instr)) goto file_err; if (ferror(outstr)) goto data_err; reply(226, "Transfer complete."); return; case TYPE_I: case TYPE_L: /* * isreg is only set if we are not doing restart and we * are sending a regular file */ netfd = fileno(outstr); filefd = fileno(instr); if (isreg && filesize < (off_t)16 * 1024 * 1024) { buf = mmap(0, filesize, PROT_READ, MAP_SHARED, filefd, (off_t)0); if (!buf) { syslog(LOG_WARNING, "mmap(%lu): %m", (unsigned long)filesize); goto oldway; } bp = buf; len = filesize; do { cnt = write(netfd, bp, len); len -= cnt; bp += cnt; if (cnt > 0) byte_count += cnt; } while(cnt > 0 && len > 0); transflag = 0; munmap(buf, (size_t)filesize); if (cnt < 0) goto data_err; reply(226, "Transfer complete."); return; } oldway: if ((buf = malloc((u_int)blksize)) == NULL) { transflag = 0; perror_reply(451, "Local resource failure: malloc"); return; } while ((cnt = read(filefd, buf, (u_int)blksize)) > 0 && write(netfd, buf, cnt) == cnt) byte_count += cnt; transflag = 0; (void)free(buf); if (cnt != 0) { if (cnt < 0) goto file_err; goto data_err; } reply(226, "Transfer complete."); return; default: transflag = 0; reply(550, "Unimplemented TYPE %d in send_data", type); return; } data_err: transflag = 0; perror_reply(426, "Data connection"); return; file_err: transflag = 0; perror_reply(551, "Error on input file"); } /* * Transfer data from peer to "outstr" using the appropriate encapulation of * the data subject to Mode, Structure, and Type. * * N.B.: Form isn't handled. */ static int receive_data(instr, outstr) FILE *instr, *outstr; { int c; int cnt, bare_lfs = 0; char buf[BUFSIZ]; transflag++; if (setjmp(urgcatch)) { transflag = 0; return (-1); } switch (type) { case TYPE_I: case TYPE_L: while ((cnt = read(fileno(instr), buf, sizeof(buf))) > 0) { if (write(fileno(outstr), buf, cnt) != cnt) goto file_err; byte_count += cnt; } if (cnt < 0) goto data_err; transflag = 0; return (0); case TYPE_E: reply(553, "TYPE E not implemented."); transflag = 0; return (-1); case TYPE_A: while ((c = getc(instr)) != EOF) { byte_count++; if (c == '\n') bare_lfs++; while (c == '\r') { if (ferror(outstr)) goto data_err; if ((c = getc(instr)) != '\n') { (void) putc ('\r', outstr); if (c == '\0' || c == EOF) goto contin2; } } (void) putc(c, outstr); contin2: ; } fflush(outstr); if (ferror(instr)) goto data_err; if (ferror(outstr)) goto file_err; transflag = 0; if (bare_lfs) { lreply(226, "WARNING! %d bare linefeeds received in ASCII mode", bare_lfs); (void)printf(" File may not have transferred correctly.\r\n"); } return (0); default: reply(550, "Unimplemented TYPE %d in receive_data", type); transflag = 0; return (-1); } data_err: transflag = 0; perror_reply(426, "Data Connection"); return (-1); file_err: transflag = 0; perror_reply(452, "Error writing file"); return (-1); } void statfilecmd(filename) char *filename; { FILE *fin; int c; char line[LINE_MAX]; (void)snprintf(line, sizeof(line), "/bin/ls -lgA %s", filename); fin = ftpd_popen(line, "r"); lreply(211, "status of %s:", filename); while ((c = getc(fin)) != EOF) { if (c == '\n') { if (ferror(stdout)){ perror_reply(421, "control connection"); (void) ftpd_pclose(fin); dologout(1); /* NOTREACHED */ } if (ferror(fin)) { perror_reply(551, filename); (void) ftpd_pclose(fin); return; } (void) putc('\r', stdout); } (void) putc(c, stdout); } (void) ftpd_pclose(fin); reply(211, "End of Status"); } void statcmd() { struct sockaddr_in *sin; u_char *a, *p; lreply(211, "%s FTP server status:", hostname, version); printf(" %s\r\n", version); printf(" Connected to %s", remotehost); if (!isdigit(remotehost[0])) printf(" (%s)", inet_ntoa(his_addr.sin_addr)); printf("\r\n"); if (logged_in) { if (guest) printf(" Logged in anonymously\r\n"); else printf(" Logged in as %s\r\n", pw->pw_name); } else if (askpasswd) printf(" Waiting for password\r\n"); else printf(" Waiting for user name\r\n"); printf(" TYPE: %s", typenames[type]); if (type == TYPE_A || type == TYPE_E) printf(", FORM: %s", formnames[form]); if (type == TYPE_L) #if NBBY == 8 printf(" %d", NBBY); #else printf(" %d", bytesize); /* need definition! */ #endif printf("; STRUcture: %s; transfer MODE: %s\r\n", strunames[stru], modenames[mode]); if (data != -1) printf(" Data connection open\r\n"); else if (pdata != -1) { printf(" in Passive mode"); sin = &pasv_addr; goto printaddr; } else if (usedefault == 0) { printf(" PORT"); sin = &data_dest; printaddr: a = (u_char *) &sin->sin_addr; p = (u_char *) &sin->sin_port; #define UC(b) (((int) b) & 0xff) printf(" (%d,%d,%d,%d,%d,%d)\r\n", UC(a[0]), UC(a[1]), UC(a[2]), UC(a[3]), UC(p[0]), UC(p[1])); #undef UC } else printf(" No data connection\r\n"); reply(211, "End of status"); } void fatal(s) char *s; { reply(451, "Error in server: %s\n", s); reply(221, "Closing connection due to server error."); dologout(0); /* NOTREACHED */ } void #if __STDC__ reply(int n, const char *fmt, ...) #else reply(n, fmt, va_alist) int n; char *fmt; va_dcl #endif { va_list ap; #if __STDC__ va_start(ap, fmt); #else va_start(ap); #endif (void)printf("%d ", n); (void)vprintf(fmt, ap); (void)printf("\r\n"); (void)fflush(stdout); if (debug) { syslog(LOG_DEBUG, "<--- %d ", n); vsyslog(LOG_DEBUG, fmt, ap); } } void #if __STDC__ lreply(int n, const char *fmt, ...) #else lreply(n, fmt, va_alist) int n; char *fmt; va_dcl #endif { va_list ap; #if __STDC__ va_start(ap, fmt); #else va_start(ap); #endif (void)printf("%d- ", n); (void)vprintf(fmt, ap); (void)printf("\r\n"); (void)fflush(stdout); if (debug) { syslog(LOG_DEBUG, "<--- %d- ", n); vsyslog(LOG_DEBUG, fmt, ap); } } static void ack(s) char *s; { reply(250, "%s command successful.", s); } void nack(s) char *s; { reply(502, "%s command not implemented.", s); } /* ARGSUSED */ void yyerror(s) char *s; { char *cp; if (cp = strchr(cbuf,'\n')) *cp = '\0'; reply(500, "'%s': command not understood.", cbuf); } void delete(name) char *name; { struct stat st; LOGCMD("delete", name); if (stat(name, &st) < 0) { perror_reply(550, name); return; } if ((st.st_mode&S_IFMT) == S_IFDIR) { if (rmdir(name) < 0) { perror_reply(550, name); return; } goto done; } if (unlink(name) < 0) { perror_reply(550, name); return; } done: ack("DELE"); } void cwd(path) char *path; { if (chdir(path) < 0) perror_reply(550, path); else ack("CWD"); } void makedir(name) char *name; { LOGCMD("mkdir", name); if (mkdir(name, 0777) < 0) perror_reply(550, name); else reply(257, "MKD command successful."); } void removedir(name) char *name; { LOGCMD("rmdir", name); if (rmdir(name) < 0) perror_reply(550, name); else ack("RMD"); } void pwd() { char path[MAXPATHLEN + 1]; if (getwd(path) == (char *)NULL) reply(550, "%s.", path); else reply(257, "\"%s\" is current directory.", path); } char * renamefrom(name) char *name; { struct stat st; if (stat(name, &st) < 0) { perror_reply(550, name); return ((char *)0); } reply(350, "File exists, ready for destination name"); return (name); } void renamecmd(from, to) char *from, *to; { LOGCMD2("rename", from, to); if (rename(from, to) < 0) perror_reply(550, "rename"); else ack("RNTO"); } static void dolog(sin) struct sockaddr_in *sin; { struct hostent *hp = gethostbyaddr((char *)&sin->sin_addr, sizeof(struct in_addr), AF_INET); if (hp) (void) strncpy(remotehost, hp->h_name, sizeof(remotehost)-1); else (void) strncpy(remotehost, inet_ntoa(sin->sin_addr), sizeof(remotehost)-1); remotehost[sizeof(remotehost)-1] = '\0'; #ifdef HASSETPROCTITLE snprintf(proctitle, sizeof(proctitle), "%s: connected", remotehost); setproctitle(proctitle); #endif /* HASSETPROCTITLE */ if (logging) syslog(LOG_INFO, "connection from %s", remotehost); } /* * Record logout in wtmp file * and exit with supplied status. */ void dologout(status) int status; { if (logged_in) { (void) seteuid((uid_t)0); logwtmp(ttyline, "", ""); if (doutmp) logout(utmp.ut_line); #if defined(KERBEROS) if (!notickets && krbtkfile_env) unlink(krbtkfile_env); #endif } /* beware of flushing buffers after a SIGPIPE */ _exit(status); } static void myoob(signo) int signo; { char *cp; /* only process if transfer occurring */ if (!transflag) return; cp = tmpline; if (getline(cp, 7, stdin) == NULL) { reply(221, "You could at least say goodbye."); dologout(0); } upper(cp); if (strcmp(cp, "ABOR\r\n") == 0) { tmpline[0] = '\0'; reply(426, "Transfer aborted. Data connection closed."); reply(226, "Abort successful"); longjmp(urgcatch, 1); } if (strcmp(cp, "STAT\r\n") == 0) { if (file_size != (off_t) -1) reply(213, "Status: %qd of %qd bytes transferred", byte_count, file_size); else reply(213, "Status: %qd bytes transferred", byte_count); } } /* * Note: a response of 425 is not mentioned as a possible response to * the PASV command in RFC959. However, it has been blessed as * a legitimate response by Jon Postel in a telephone conversation * with Rick Adams on 25 Jan 89. */ void passive() { int len, on; u_short port; char *p, *a; if (pw == NULL) { reply(530, "Please login with USER and PASS"); return; } if (pdata >= 0) close(pdata); pdata = socket(AF_INET, SOCK_STREAM, 0); if (pdata < 0) { perror_reply(425, "Can't open passive connection"); return; } #ifdef IP_PORTRANGE on = high_data_ports ? IP_PORTRANGE_HIGH : IP_PORTRANGE_DEFAULT; if (setsockopt(pdata, IPPROTO_IP, IP_PORTRANGE, (char *)&on, sizeof(on)) < 0) goto pasv_error; #endif pasv_addr = ctrl_addr; pasv_addr.sin_port = 0; if (bind(pdata, (struct sockaddr *)&pasv_addr, sizeof(pasv_addr)) < 0) goto pasv_error; len = sizeof(pasv_addr); if (getsockname(pdata, (struct sockaddr *) &pasv_addr, &len) < 0) goto pasv_error; if (listen(pdata, 1) < 0) goto pasv_error; a = (char *) &pasv_addr.sin_addr; p = (char *) &pasv_addr.sin_port; #define UC(b) (((int) b) & 0xff) reply(227, "Entering Passive Mode (%d,%d,%d,%d,%d,%d)", UC(a[0]), UC(a[1]), UC(a[2]), UC(a[3]), UC(p[0]), UC(p[1])); return; pasv_error: (void) close(pdata); pdata = -1; perror_reply(425, "Can't open passive connection"); return; } /* * Generate unique name for file with basename "local". * The file named "local" is already known to exist. * Generates failure reply on error. */ static char * gunique(local) char *local; { static char new[MAXPATHLEN]; struct stat st; int count, len; char *cp; cp = strrchr(local, '/'); if (cp) *cp = '\0'; if (stat(cp ? local : ".", &st) < 0) { perror_reply(553, cp ? local : "."); return ((char *) 0); } if (cp) *cp = '/'; (void) strncpy(new, local, sizeof(new)-1); new[sizeof(new)-1] = '\0'; len = strlen(new); if (len+2+1 >= sizeof(new)-1) return (NULL); cp = new + len; *cp++ = '.'; for (count = 1; count < 100; count++) { (void)snprintf(cp, sizeof(new) - (cp - new), "%d", count); if (stat(new, &st) < 0) return (new); } reply(452, "Unique file name cannot be created."); return (NULL); } /* * Format and send reply containing system error number. */ void perror_reply(code, string) int code; char *string; { reply(code, "%s: %s.", string, strerror(errno)); } static char *onefile[] = { "", 0 }; void send_file_list(whichf) char *whichf; { struct stat st; DIR *dirp = NULL; struct dirent *dir; FILE *dout = NULL; char **dirlist, *dirname; int simple = 0; int freeglob = 0; glob_t gl; if (strpbrk(whichf, "~{[*?") != NULL) { int flags = GLOB_BRACE|GLOB_NOCHECK|GLOB_QUOTE|GLOB_TILDE; memset(&gl, 0, sizeof(gl)); freeglob = 1; if (glob(whichf, flags, 0, &gl)) { reply(550, "not found"); goto out; } else if (gl.gl_pathc == 0) { errno = ENOENT; perror_reply(550, whichf); goto out; } dirlist = gl.gl_pathv; } else { onefile[0] = whichf; dirlist = onefile; simple = 1; } if (setjmp(urgcatch)) { transflag = 0; goto out; } while (dirname = *dirlist++) { if (stat(dirname, &st) < 0) { /* * If user typed "ls -l", etc, and the client * used NLST, do what the user meant. */ if (dirname[0] == '-' && *dirlist == NULL && transflag == 0) { retrieve("/bin/ls %s", dirname); goto out; } perror_reply(550, whichf); if (dout != NULL) { (void) fclose(dout); transflag = 0; data = -1; pdata = -1; } goto out; } if (S_ISREG(st.st_mode)) { if (dout == NULL) { dout = dataconn("file list", (off_t)-1, "w"); if (dout == NULL) goto out; transflag++; } fprintf(dout, "%s%s\n", dirname, type == TYPE_A ? "\r" : ""); byte_count += strlen(dirname) + 1; continue; } else if (!S_ISDIR(st.st_mode)) continue; if ((dirp = opendir(dirname)) == NULL) continue; while ((dir = readdir(dirp)) != NULL) { char nbuf[MAXPATHLEN]; if (dir->d_name[0] == '.' && dir->d_namlen == 1) continue; if (dir->d_name[0] == '.' && dir->d_name[1] == '.' && dir->d_namlen == 2) continue; snprintf(nbuf, sizeof(nbuf), "%s/%s", dirname, dir->d_name); /* * We have to do a stat to insure it's * not a directory or special file. */ if (simple || (stat(nbuf, &st) == 0 && S_ISREG(st.st_mode))) { if (dout == NULL) { dout = dataconn("file list", (off_t)-1, "w"); if (dout == NULL) goto out; transflag++; } if (nbuf[0] == '.' && nbuf[1] == '/') fprintf(dout, "%s%s\n", &nbuf[2], type == TYPE_A ? "\r" : ""); else fprintf(dout, "%s%s\n", nbuf, type == TYPE_A ? "\r" : ""); byte_count += strlen(nbuf) + 1; } } (void) closedir(dirp); } if (dout == NULL) reply(550, "No files found."); else if (ferror(dout) != 0) perror_reply(550, "Data connection"); else reply(226, "Transfer complete."); transflag = 0; if (dout != NULL) (void) fclose(dout); data = -1; pdata = -1; out: if (freeglob) { freeglob = 0; globfree(&gl); } } static void reapchild(signo) int signo; { while (wait3(NULL, WNOHANG, NULL) > 0); } void logxfer(name, size, start) char *name; off_t size; time_t start; { char buf[2048]; char path[MAXPATHLEN]; char vremotehost[MAXHOSTNAMELEN*4], vpath[MAXPATHLEN*4]; char *vname, *vpw; time_t now; if ((statfd >= 0) && (getcwd(path, sizeof(path)) != NULL)) { time(&now); vname = (char *)malloc(strlen(name)*4+1); if (vname == NULL) return; vpw = (char *)malloc(strlen((guest) ? guestpw : pw->pw_name)*4+1); if (vpw == NULL) { free(vname); return; } strvis(vremotehost, remotehost, VIS_SAFE|VIS_NOSLASH); strvis(vpath, path, VIS_SAFE|VIS_NOSLASH); strvis(vname, name, VIS_SAFE|VIS_NOSLASH); strvis(vpw, (guest) ? guestpw : pw->pw_name, VIS_SAFE|VIS_NOSLASH); snprintf(buf, sizeof(buf), "%.24s %d %s %qd %s/%s %c %s %c %c %s ftp %d %s %s\n", ctime(&now), now - start + (now == start), vremotehost, size, vpath, vname, ((type == TYPE_A) ? 'a' : 'b'), "*" /* none yet */, 'o', ((guest) ? 'a' : 'r'), vpw, 0 /* none yet */, ((guest) ? "*" : pw->pw_name), dhostname); write(statfd, buf, strlen(buf)); free(vname); free(vpw); } }