/* * 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. */ #if 0 #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 */ #endif #ifndef lint #if 0 static char sccsid[] = "@(#)ftpd.c 8.4 (Berkeley) 4/16/94"; #endif static const char rcsid[] = "$FreeBSD$"; #endif /* not lint */ /* * FTP server. */ #include #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 #ifdef LOGIN_CAP #include #endif #ifdef USE_PAM #include #endif #include "pathnames.h" #include "extern.h" #if __STDC__ #include #else #include #endif static char version[] = "Version 6.00LS"; #undef main /* wrapper for KAME-special getnameinfo() */ #ifndef NI_WITHSCOPEID #define NI_WITHSCOPEID 0 #endif extern off_t restart_point; extern char cbuf[]; union sockunion server_addr; union sockunion ctrl_addr; union sockunion data_source; union sockunion data_dest; union sockunion his_addr; union sockunion pasv_addr; int daemon_mode; int data; int logged_in; struct passwd *pw; int ftpdebug; 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 restricted_data_ports = 1; int paranoid = 1; /* be extra careful about security */ int anon_only = 0; /* Only anonymous ftp allowed */ int guest; int dochroot; int stats; int statfd = -1; int type; int form; int stru; /* avoid C keyword */ int mode; int usedefault = 1; /* for data transfers */ int pdata = -1; /* for passive mode */ int readonly=0; /* Server is in readonly mode. */ int noepsv=0; /* EPSV command is disabled. */ int noretr=0; /* RETR command is disabled. */ int noguestretr=0; /* RETR command is disabled for anon users. */ static volatile sig_atomic_t recvurg; 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; int epsvall = 0; #ifdef VIRTUAL_HOSTING char *ftpuser; static struct ftphost { struct ftphost *next; struct addrinfo *hostinfo; char *hostname; char *anonuser; char *statfile; char *welcome; char *loginmsg; } *thishost, *firsthost; #endif char remotehost[MAXHOSTNAMELEN]; char *ident = NULL; static char ttyline[20]; char *tty = ttyline; /* for klogin */ #ifdef USE_PAM static int auth_pam __P((struct passwd**, const char*)); pam_handle_t *pamh = NULL; #endif static struct opie opiedata; static char opieprompt[OPIE_CHALLENGE_MAX+1]; static int pwok; char *pid_file = NULL; /* * Limit number of pathnames that glob can return. * A limit of 0 indicates the number of pathnames is unlimited. */ #define MAXGLOBARGS 16384 # /* * 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 SETPROCTITLE #ifdef OLD_SETPROCTITLE char **Argv = NULL; /* pointer to argument vector */ char *LastArgv = NULL; /* end of argv */ #endif /* OLD_SETPROCTITLE */ char proctitle[LINE_MAX]; /* initial part of title */ #endif /* SETPROCTITLE */ #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); \ } #ifdef VIRTUAL_HOSTING static void inithosts __P((void)); static void selecthost __P((union sockunion *)); #endif static void ack __P((char *)); static void sigurg __P((int)); static void myoob __P((void)); static int checkuser __P((char *, char *, int)); static FILE *dataconn __P((char *, off_t, char *)); static void dolog __P((struct sockaddr *)); 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 int 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)); static 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; int error; char *bindname = NULL; int family = AF_UNSPEC; int enable_v4 = 0; struct sigaction sa; tzset(); /* in case no timezone database in ~ftp */ sigemptyset(&sa.sa_mask); sa.sa_flags = SA_RESTART; #ifdef OLD_SETPROCTITLE /* * Save start and extent of argv for setproctitle. */ Argv = argv; while (*envp) envp++; LastArgv = envp[-1] + strlen(envp[-1]); #endif /* OLD_SETPROCTITLE */ while ((ch = getopt(argc, argv, "AdlDESURrt:T:u:vOoa:p:46")) != -1) { switch (ch) { case 'D': daemon_mode++; break; case 'd': ftpdebug++; break; case 'E': noepsv = 1; break; case 'l': logging++; /* > 1 == extra logging */ break; case 'r': readonly = 1; break; case 'R': paranoid = 0; break; case 'S': stats++; break; case 'T': maxtimeout = atoi(optarg); if (timeout > maxtimeout) timeout = maxtimeout; break; case 't': timeout = atoi(optarg); if (maxtimeout < timeout) maxtimeout = timeout; break; case 'U': restricted_data_ports = 0; break; case 'a': bindname = optarg; break; case 'p': pid_file = optarg; 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 'A': anon_only = 1; break; case 'v': ftpdebug = 1; break; case '4': enable_v4 = 1; if (family == AF_UNSPEC) family = AF_INET; break; case '6': family = AF_INET6; break; case 'O': noguestretr = 1; break; case 'o': noretr = 1; break; default: warnx("unknown flag -%c ignored", optopt); break; } } #ifdef VIRTUAL_HOSTING inithosts(); #endif (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 addrinfo hints, *res; /* * Detach from parent. */ if (daemon(1, 1) < 0) { syslog(LOG_ERR, "failed to become a daemon"); exit(1); } sa.sa_handler = reapchild; (void)sigaction(SIGCHLD, &sa, NULL); /* init bind_sa */ memset(&hints, 0, sizeof(hints)); hints.ai_family = family == AF_UNSPEC ? AF_INET : family; hints.ai_socktype = SOCK_STREAM; hints.ai_protocol = 0; hints.ai_flags = AI_PASSIVE; error = getaddrinfo(bindname, "ftp", &hints, &res); if (error) { if (family == AF_UNSPEC) { hints.ai_family = AF_UNSPEC; error = getaddrinfo(bindname, "ftp", &hints, &res); } } if (error) { syslog(LOG_ERR, "%s", gai_strerror(error)); if (error == EAI_SYSTEM) syslog(LOG_ERR, "%s", strerror(errno)); exit(1); } if (res->ai_addr == NULL) { syslog(LOG_ERR, "-a %s: getaddrinfo failed", hostname); exit(1); } else family = res->ai_addr->sa_family; /* * Open a socket, bind it to the FTP port, and start * listening. */ ctl_sock = socket(family, 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"); #ifdef IPV6_BINDV6ONLY if (family == AF_INET6 && enable_v4 == 0) { if (setsockopt(ctl_sock, IPPROTO_IPV6, IPV6_BINDV6ONLY, (char *)&on, sizeof (on)) < 0) syslog(LOG_ERR, "control setsockopt(IPV6_BINDV6ONLY): %m"); } #endif /* IPV6_BINDV6ONLY */ memcpy(&server_addr, res->ai_addr, res->ai_addr->sa_len); if (bind(ctl_sock, (struct sockaddr *)&server_addr, server_addr.su_len) < 0) { syslog(LOG_ERR, "control bind: %m"); exit(1); } if (listen(ctl_sock, 32) < 0) { syslog(LOG_ERR, "control listen: %m"); exit(1); } /* * Atomically write process ID */ if (pid_file) { int fd; char buf[20]; fd = open(pid_file, O_CREAT | O_WRONLY | O_TRUNC | O_NONBLOCK | O_EXLOCK, 0644); if (fd < 0) { if (errno == EAGAIN) errx(1, "%s: file locked", pid_file); else err(1, "%s", pid_file); } snprintf(buf, sizeof(buf), "%lu\n", (unsigned long) getpid()); if (write(fd, buf, strlen(buf)) < 0) err(1, "%s: write", pid_file); /* Leave the pid file open and locked */ } /* * Loop forever accepting connection requests and forking off * children to handle them. */ while (1) { addrlen = server_addr.su_len; 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); } } sa.sa_handler = SIG_DFL; (void)sigaction(SIGCHLD, &sa, NULL); sa.sa_handler = sigurg; sa.sa_flags = 0; /* don't restart syscalls for SIGURG */ (void)sigaction(SIGURG, &sa, NULL); sigfillset(&sa.sa_mask); /* block all signals in handler */ sa.sa_flags = SA_RESTART; sa.sa_handler = sigquit; (void)sigaction(SIGHUP, &sa, NULL); (void)sigaction(SIGINT, &sa, NULL); (void)sigaction(SIGQUIT, &sa, NULL); (void)sigaction(SIGTERM, &sa, NULL); sa.sa_handler = lostconn; (void)sigaction(SIGPIPE, &sa, NULL); addrlen = sizeof(ctrl_addr); if (getsockname(0, (struct sockaddr *)&ctrl_addr, &addrlen) < 0) { syslog(LOG_ERR, "getsockname (%s): %m",argv[0]); exit(1); } #ifdef VIRTUAL_HOSTING /* select our identity from virtual host table */ selecthost(&ctrl_addr); #endif #ifdef IP_TOS if (ctrl_addr.su_family == AF_INET) { tos = IPTOS_LOWDELAY; if (setsockopt(0, IPPROTO_IP, IP_TOS, (char *)&tos, sizeof(int)) < 0) syslog(LOG_WARNING, "setsockopt (IP_TOS): %m"); } #endif /* * Disable Nagle on the control channel so that we don't have to wait * for peer's ACK before issuing our next reply. */ if (setsockopt(0, IPPROTO_TCP, TCP_NODELAY, &on, sizeof(on)) < 0) syslog(LOG_WARNING, "control setsockopt TCP_NODELAY: %m"); data_source.su_port = htons(ntohs(ctrl_addr.su_port) - 1); /* set this here so klogin can use it... */ (void)snprintf(ttyline, sizeof(ttyline), "ftp%d", getpid()); /* 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((struct sockaddr *)&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); } #ifdef VIRTUAL_HOSTING if ((fd = fopen(thishost->welcome, "r")) != NULL) { #else if ((fd = fopen(_PATH_FTPWELCOME, "r")) != NULL) { #endif 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 */ } #ifndef VIRTUAL_HOSTING if ((hostname = malloc(MAXHOSTNAMELEN)) == NULL) fatalerror("Ran out of memory."); (void) gethostname(hostname, MAXHOSTNAMELEN - 1); hostname[MAXHOSTNAMELEN - 1] = '\0'; #endif reply(220, "%s FTP server (%s) ready.", hostname, version); for (;;) (void) yyparse(); /* NOTREACHED */ } static void lostconn(signo) int signo; { if (ftpdebug) syslog(LOG_DEBUG, "lost connection"); dologout(1); } static void sigquit(signo) int signo; { syslog(LOG_ERR, "got signal %d", signo); dologout(1); } #ifdef VIRTUAL_HOSTING /* * read in virtual host tables (if they exist) */ static void inithosts() { FILE *fp; char *cp; struct ftphost *hrp, *lhrp; char line[1024]; struct addrinfo hints, *res, *ai; /* * Fill in the default host information */ if (gethostname(line, sizeof(line)) < 0) line[0] = '\0'; if ((hrp = malloc(sizeof(struct ftphost))) == NULL || (hrp->hostname = strdup(line)) == NULL) fatalerror("Ran out of memory."); hrp->hostinfo = NULL; memset(&hints, 0, sizeof(hints)); hints.ai_flags = AI_CANONNAME; hints.ai_family = AF_UNSPEC; getaddrinfo(hrp->hostname, NULL, &hints, &res); if (res) hrp->hostinfo = res; hrp->statfile = _PATH_FTPDSTATFILE; hrp->welcome = _PATH_FTPWELCOME; hrp->loginmsg = _PATH_FTPLOGINMESG; hrp->anonuser = "ftp"; hrp->next = NULL; thishost = firsthost = lhrp = hrp; if ((fp = fopen(_PATH_FTPHOSTS, "r")) != NULL) { int addrsize, error, gothost; void *addr; struct hostent *hp; while (fgets(line, sizeof(line), fp) != NULL) { int i, hp_error; if ((cp = strchr(line, '\n')) == NULL) { /* ignore long lines */ while (fgets(line, sizeof(line), fp) != NULL && strchr(line, '\n') == NULL) ; continue; } *cp = '\0'; cp = strtok(line, " \t"); /* skip comments and empty lines */ if (cp == NULL || line[0] == '#') continue; hints.ai_flags = 0; hints.ai_family = AF_UNSPEC; hints.ai_flags = AI_PASSIVE; error = getaddrinfo(cp, NULL, &hints, &res); if (error != NULL) continue; for (ai = res; ai != NULL && ai->ai_addr != NULL; ai = ai->ai_next) { gothost = 0; for (hrp = firsthost; hrp != NULL; hrp = hrp->next) { struct addrinfo *hi; for (hi = hrp->hostinfo; hi != NULL; hi = hi->ai_next) if (hi->ai_addrlen == ai->ai_addrlen && memcmp(hi->ai_addr, ai->ai_addr, ai->ai_addr->sa_len) == 0) { gothost++; break; } if (gothost) break; } if (hrp == NULL) { if ((hrp = malloc(sizeof(struct ftphost))) == NULL) continue; /* defaults */ hrp->statfile = _PATH_FTPDSTATFILE; hrp->welcome = _PATH_FTPWELCOME; hrp->loginmsg = _PATH_FTPLOGINMESG; hrp->anonuser = "ftp"; hrp->next = NULL; lhrp->next = hrp; lhrp = hrp; } hrp->hostinfo = res; /* * determine hostname to use. * force defined name if there is a valid alias * otherwise fallback to primary hostname */ /* XXX: getaddrinfo() can't do alias check */ switch(hrp->hostinfo->ai_family) { case AF_INET: addr = &((struct sockaddr_in *)&hrp->hostinfo->ai_addr)->sin_addr; addrsize = sizeof(struct sockaddr_in); break; case AF_INET6: addr = &((struct sockaddr_in6 *)&hrp->hostinfo->ai_addr)->sin6_addr; addrsize = sizeof(struct sockaddr_in6); break; default: /* should not reach here */ if (hrp->hostinfo != NULL) freeaddrinfo(hrp->hostinfo); free(hrp); continue; /* NOTREACHED */ } if ((hp = getipnodebyaddr((char*)addr, addrsize, hrp->hostinfo->ai_family, &hp_error)) != NULL) { if (strcmp(cp, hp->h_name) != 0) { if (hp->h_aliases == NULL) cp = hp->h_name; else { i = 0; while (hp->h_aliases[i] && strcmp(cp, hp->h_aliases[i]) != 0) ++i; if (hp->h_aliases[i] == NULL) cp = hp->h_name; } } } hrp->hostname = strdup(cp); freehostent(hp); /* ok, now we now peel off the rest */ i = 0; while (i < 4 && (cp = strtok(NULL, " \t")) != NULL) { if (*cp != '-' && (cp = strdup(cp)) != NULL) { switch (i) { case 0: /* anon user permissions */ hrp->anonuser = cp; break; case 1: /* statistics file */ hrp->statfile = cp; break; case 2: /* welcome message */ hrp->welcome = cp; break; case 3: /* login message */ hrp->loginmsg = cp; break; } } ++i; } /* XXX: re-initialization for getaddrinfo() loop */ cp = strtok(line, " \t"); } } (void) fclose(fp); } } static void selecthost(su) union sockunion *su; { struct ftphost *hrp; u_int16_t port; #ifdef INET6 struct in6_addr *mapped_in6 = NULL; #endif struct addrinfo *hi; #ifdef INET6 /* * XXX IPv4 mapped IPv6 addr consideraton, * specified in rfc2373. */ if (su->su_family == AF_INET6 && IN6_IS_ADDR_V4MAPPED(&su->su_sin6.sin6_addr)) mapped_in6 = &su->su_sin6.sin6_addr; #endif hrp = thishost = firsthost; /* default */ port = su->su_port; su->su_port = 0; while (hrp != NULL) { for (hi = hrp->hostinfo; hi != NULL; hi = hi->ai_next) { if (memcmp(su, hi->ai_addr, hi->ai_addrlen) == 0) { thishost = hrp; break; } #ifdef INET6 /* XXX IPv4 mapped IPv6 addr consideraton */ if (hi->ai_addr->sa_family == AF_INET && mapped_in6 != NULL && (memcmp(&mapped_in6->s6_addr[12], &((struct sockaddr_in *)hi->ai_addr)->sin_addr, sizeof(struct in_addr)) == 0)) { thishost = hrp; break; } #endif } hrp = hrp->next; } su->su_port = port; /* setup static variables as appropriate */ hostname = thishost->hostname; ftpuser = thishost->anonuser; } #endif /* * 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); 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[MAXLOGNAME]; /* 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", 0) || checkuser(_PATH_FTPUSERS, "anonymous", 0)) reply(530, "User %s access denied.", name); #ifdef VIRTUAL_HOSTING else if ((pw = sgetpwnam(thishost->anonuser)) != NULL) { #else else if ((pw = sgetpwnam("ftp")) != NULL) { #endif guest = 1; askpasswd = 1; reply(331, "Guest login ok, send your email address as password."); } else reply(530, "User %s unknown.", name); if (!askpasswd && logging) syslog(LOG_NOTICE, "ANONYMOUS FTP LOGIN REFUSED FROM %s", remotehost); return; } if (anon_only != 0) { reply(530, "Sorry, only anonymous ftp allowed."); 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, 1)) { 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); pwok = 0; #ifdef USE_PAM /* XXX Kluge! The conversation mechanism needs to be fixed. */ #endif if (opiechallenge(&opiedata, name, opieprompt) == 0) { pwok = (pw != NULL) && opieaccessfile(remotehost) && opiealways(pw->pw_dir); reply(331, "Response to %s %s for %s.", opieprompt, pwok ? "requested" : "required", name); } else { pwok = 1; 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, pwset) char *fname; char *name; int pwset; { FILE *fd; int found = 0; char *p, line[BUFSIZ]; if ((fd = fopen(fname, "r")) != NULL) { while (!found && fgets(line, sizeof(line), fd) != NULL) if ((p = strchr(line, '\n')) != NULL) { *p = '\0'; if (line[0] == '#') continue; /* * if first chr is '@', check group membership */ if (line[0] == '@') { int i = 0; struct group *grp; if ((grp = getgrnam(line+1)) == NULL) continue; /* * Check user's default group */ if (pwset && grp->gr_gid == pw->pw_gid) found = 1; /* * Check supplementary groups */ while (!found && grp->gr_mem[i]) found = strcmp(name, grp->gr_mem[i++]) == 0; } /* * Otherwise, just check for username match */ else found = strcmp(line, name) == 0; } (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() { #ifdef USE_PAM int e; #endif (void) seteuid((uid_t)0); if (logged_in) ftpd_logwtmp(ttyline, "", NULL); pw = NULL; #ifdef LOGIN_CAP setusercontext(NULL, getpwuid(0), (uid_t)0, LOGIN_SETPRIORITY|LOGIN_SETRESOURCES|LOGIN_SETUMASK); #endif #ifdef USE_PAM if ((e = pam_setcred(pamh, PAM_DELETE_CRED)) != PAM_SUCCESS) syslog(LOG_ERR, "pam_setcred: %s", pam_strerror(pamh, e)); if ((e = pam_close_session(pamh,0)) != PAM_SUCCESS) syslog(LOG_ERR, "pam_close_session: %s", pam_strerror(pamh, e)); if ((e = pam_end(pamh, e)) != PAM_SUCCESS) syslog(LOG_ERR, "pam_end: %s", pam_strerror(pamh, e)); pamh = NULL; #endif logged_in = 0; guest = 0; dochroot = 0; } #ifdef USE_PAM /* * the following code is stolen from imap-uw PAM authentication module and * login.c */ #define COPY_STRING(s) (s ? strdup(s) : NULL) struct cred_t { const char *uname; /* user name */ const char *pass; /* password */ }; typedef struct cred_t cred_t; static int auth_conv(int num_msg, const struct pam_message **msg, struct pam_response **resp, void *appdata) { int i; cred_t *cred = (cred_t *) appdata; struct pam_response *reply = malloc(sizeof(struct pam_response) * num_msg); for (i = 0; i < num_msg; i++) { switch (msg[i]->msg_style) { case PAM_PROMPT_ECHO_ON: /* assume want user name */ reply[i].resp_retcode = PAM_SUCCESS; reply[i].resp = COPY_STRING(cred->uname); /* PAM frees resp. */ break; case PAM_PROMPT_ECHO_OFF: /* assume want password */ reply[i].resp_retcode = PAM_SUCCESS; reply[i].resp = COPY_STRING(cred->pass); /* PAM frees resp. */ break; case PAM_TEXT_INFO: case PAM_ERROR_MSG: reply[i].resp_retcode = PAM_SUCCESS; reply[i].resp = NULL; break; default: /* unknown message style */ free(reply); return PAM_CONV_ERR; } } *resp = reply; return PAM_SUCCESS; } /* * Attempt to authenticate the user using PAM. Returns 0 if the user is * authenticated, or 1 if not authenticated. If some sort of PAM system * error occurs (e.g., the "/etc/pam.conf" file is missing) then this * function returns -1. This can be used as an indication that we should * fall back to a different authentication mechanism. */ static int auth_pam(struct passwd **ppw, const char *pass) { pam_handle_t *pamh = NULL; const char *tmpl_user; const void *item; int rval; int e; cred_t auth_cred = { (*ppw)->pw_name, pass }; struct pam_conv conv = { &auth_conv, &auth_cred }; e = pam_start("ftpd", (*ppw)->pw_name, &conv, &pamh); if (e != PAM_SUCCESS) { syslog(LOG_ERR, "pam_start: %s", pam_strerror(pamh, e)); return -1; } e = pam_set_item(pamh, PAM_RHOST, remotehost); if (e != PAM_SUCCESS) { syslog(LOG_ERR, "pam_set_item(PAM_RHOST): %s", pam_strerror(pamh, e)); return -1; } e = pam_authenticate(pamh, 0); switch (e) { case PAM_SUCCESS: /* * With PAM we support the concept of a "template" * user. The user enters a login name which is * authenticated by PAM, usually via a remote service * such as RADIUS or TACACS+. If authentication * succeeds, a different but related "template" name * is used for setting the credentials, shell, and * home directory. The name the user enters need only * exist on the remote authentication server, but the * template name must be present in the local password * database. * * This is supported by two various mechanisms in the * individual modules. However, from the application's * point of view, the template user is always passed * back as a changed value of the PAM_USER item. */ if ((e = pam_get_item(pamh, PAM_USER, &item)) == PAM_SUCCESS) { tmpl_user = (const char *) item; if (strcmp((*ppw)->pw_name, tmpl_user) != 0) *ppw = getpwnam(tmpl_user); } else syslog(LOG_ERR, "Couldn't get PAM_USER: %s", pam_strerror(pamh, e)); rval = 0; break; case PAM_AUTH_ERR: case PAM_USER_UNKNOWN: case PAM_MAXTRIES: rval = 1; break; default: syslog(LOG_ERR, "pam_authenticate: %s", pam_strerror(pamh, e)); rval = -1; break; } if (rval == 0) { e = pam_acct_mgmt(pamh, 0); if (e == PAM_NEW_AUTHTOK_REQD) { e = pam_chauthtok(pamh, PAM_CHANGE_EXPIRED_AUTHTOK); if (e != PAM_SUCCESS) { syslog(LOG_ERR, "pam_chauthtok: %s", pam_strerror(pamh, e)); rval = 1; } } else if (e != PAM_SUCCESS) { rval = 1; } } if (rval != 0) { if ((e = pam_end(pamh, e)) != PAM_SUCCESS) { syslog(LOG_ERR, "pam_end: %s", pam_strerror(pamh, e)); } pamh = NULL; } return rval; } #endif /* USE_PAM */ void pass(passwd) char *passwd; { int rval; FILE *fd; #ifdef LOGIN_CAP login_cap_t *lc = NULL; #endif #ifdef USE_PAM int e; #endif char *xpasswd; 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; } #ifdef USE_PAM rval = auth_pam(&pw, passwd); if (rval >= 0) { opieunlock(); goto skip; } #endif if (opieverify(&opiedata, passwd) == 0) xpasswd = pw->pw_passwd; else if (pwok) { xpasswd = crypt(passwd, pw->pw_passwd); if (passwd[0] == '\0' && pw->pw_passwd[0] != '\0') xpasswd = ":"; } else { rval = 1; goto skip; } rval = strcmp(pw->pw_passwd, xpasswd); if (pw->pw_expire && time(NULL) >= pw->pw_expire) rval = 1; /* failure */ skip: /* * If rval == 1, the user failed the authentication check * above. If rval == 0, either PAM 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; } } login_attempts = 0; /* this time successful */ if (setegid((gid_t)pw->pw_gid) < 0) { reply(550, "Can't set gid."); return; } /* May be overridden by login.conf */ (void) umask(defumask); #ifdef LOGIN_CAP if ((lc = login_getpwclass(pw)) != NULL) { char remote_ip[MAXHOSTNAMELEN]; getnameinfo((struct sockaddr *)&his_addr, his_addr.su_len, remote_ip, sizeof(remote_ip) - 1, NULL, 0, NI_NUMERICHOST|NI_WITHSCOPEID); remote_ip[sizeof(remote_ip) - 1] = 0; if (!auth_hostok(lc, remotehost, remote_ip)) { syslog(LOG_INFO|LOG_AUTH, "FTP LOGIN FAILED (HOST) as %s: permission denied.", pw->pw_name); reply(530, "Permission denied.\n"); pw = NULL; return; } if (!auth_timeok(lc, time(NULL))) { reply(530, "Login not available right now.\n"); pw = NULL; return; } } setusercontext(lc, pw, (uid_t)0, LOGIN_SETLOGIN|LOGIN_SETGROUP|LOGIN_SETPRIORITY| LOGIN_SETRESOURCES|LOGIN_SETUMASK); #else setlogin(pw->pw_name); (void) initgroups(pw->pw_name, pw->pw_gid); #endif #ifdef USE_PAM if (pamh) { if ((e = pam_open_session(pamh, 0)) != PAM_SUCCESS) { syslog(LOG_ERR, "pam_open_session: %s", pam_strerror(pamh, e)); } else if ((e = pam_setcred(pamh, PAM_ESTABLISH_CRED)) != PAM_SUCCESS) { syslog(LOG_ERR, "pam_setcred: %s", pam_strerror(pamh, e)); } } #endif /* open wtmp before chroot */ ftpd_logwtmp(ttyline, pw->pw_name, (struct sockaddr *)&his_addr); logged_in = 1; if (guest && stats && statfd < 0) #ifdef VIRTUAL_HOSTING if ((statfd = open(thishost->statfile, O_WRONLY|O_APPEND)) < 0) #else if ((statfd = open(_PATH_FTPDSTATFILE, O_WRONLY|O_APPEND)) < 0) #endif stats = 0; dochroot = #ifdef LOGIN_CAP /* Allow login.conf configuration as well */ login_getcapbool(lc, "ftp-chroot", 0) || #endif checkuser(_PATH_FTPCHROOT, pw->pw_name, 1); 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(pw->pw_dir) < 0 || chdir("/") < 0) { reply(550, "Can't set guest privileges."); goto bad; } } else if (dochroot) { if (chroot(pw->pw_dir) < 0 || chdir("/") < 0) { reply(550, "Can't change root."); goto bad; } } 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; } /* * Display a login message, if it exists. * N.B. reply(230,) must follow the message. */ #ifdef VIRTUAL_HOSTING if ((fd = fopen(thishost->loginmsg, "r")) != NULL) { #else if ((fd = fopen(_PATH_FTPLOGINMESG, "r")) != NULL) { #endif 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 == NULL) fatalerror("Ran out of memory."); reply(230, "Guest login ok, access restrictions apply."); #ifdef SETPROCTITLE #ifdef VIRTUAL_HOSTING if (thishost != firsthost) snprintf(proctitle, sizeof(proctitle), "%s: anonymous(%s)/%s", remotehost, hostname, passwd); else #endif snprintf(proctitle, sizeof(proctitle), "%s: anonymous/%s", remotehost, passwd); setproctitle("%s", proctitle); #endif /* SETPROCTITLE */ if (logging) syslog(LOG_INFO, "ANONYMOUS FTP LOGIN FROM %s, %s", remotehost, passwd); } else { if (dochroot) reply(230, "User %s logged in, " "access restrictions apply.", pw->pw_name); else reply(230, "User %s logged in.", pw->pw_name); #ifdef SETPROCTITLE snprintf(proctitle, sizeof(proctitle), "%s: user/%s", remotehost, pw->pw_name); setproctitle("%s", proctitle); #endif /* SETPROCTITLE */ if (logging) syslog(LOG_INFO, "FTP LOGIN FROM %s as %s", remotehost, pw->pw_name); } #ifdef LOGIN_CAP login_close(lc); #endif return; bad: /* Forget all about it... */ #ifdef LOGIN_CAP login_close(lc); #endif 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 && guest && 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 || guest) && 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 (fseeko(fout, (off_t)0, SEEK_CUR) < 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(data_dest.su_family, 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 = ctrl_addr; data_source.su_port = htons(20); /* ftp-data port */ for (tries = 1; ; tries++) { if (bind(s, (struct sockaddr *)&data_source, data_source.su_len) >= 0) break; if (errno != EADDRINUSE || tries > 10) goto bad; sleep(tries); } (void) seteuid((uid_t)pw->pw_uid); #ifdef IP_TOS if (data_source.su_family == AF_INET) { 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'; if (pdata >= 0) { union sockunion from; int flags; int s, fromlen = ctrl_addr.su_len; struct timeval timeout; fd_set set; FD_ZERO(&set); FD_SET(pdata, &set); timeout.tv_usec = 0; timeout.tv_sec = 120; /* * Granted a socket is in the blocking I/O mode, * accept() will block after a successful select() * if the selected connection dies in between. * Therefore set the non-blocking I/O flag here. */ if ((flags = fcntl(pdata, F_GETFL, 0)) == -1 || fcntl(pdata, F_SETFL, flags | O_NONBLOCK) == -1) goto pdata_err; if (select(pdata+1, &set, (fd_set *) 0, (fd_set *) 0, &timeout) <= 0 || (s = accept(pdata, (struct sockaddr *) &from, &fromlen)) < 0) goto pdata_err; (void) close(pdata); pdata = s; /* * Unset the blocking I/O flag on the child socket * again so stdio can work on it. */ if ((flags = fcntl(pdata, F_GETFL, 0)) == -1 || fcntl(pdata, F_SETFL, flags & ~O_NONBLOCK) == -1) goto pdata_err; #ifdef IP_TOS if (from.su_family == AF_INET) { 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)); pdata_err: reply(425, "Can't open data connection."); (void) close(pdata); pdata = -1; return (NULL); } 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) { char hostbuf[BUFSIZ], portbuf[BUFSIZ]; getnameinfo((struct sockaddr *)&data_source, data_source.su_len, hostbuf, sizeof(hostbuf) - 1, portbuf, sizeof(portbuf), NI_NUMERICHOST|NI_NUMERICSERV|NI_WITHSCOPEID); reply(425, "Can't create data socket (%s,%s): %s.", hostbuf, portbuf, strerror(errno)); return (NULL); } data = fileno(file); while (connect(data, (struct sockaddr *)&data_dest, data_dest.su_len) < 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 int send_data(instr, outstr, blksize, filesize, isreg) FILE *instr, *outstr; off_t blksize; off_t filesize; int isreg; { int c, filefd, netfd; char *buf; size_t len; off_t cnt; transflag++; switch (type) { case TYPE_A: while ((c = getc(instr)) != EOF) { if (recvurg) goto got_oob; byte_count++; if (c == '\n') { if (ferror(outstr)) goto data_err; (void) putc('\r', outstr); } (void) putc(c, outstr); } if (recvurg) goto got_oob; fflush(outstr); transflag = 0; if (ferror(instr)) goto file_err; if (ferror(outstr)) goto data_err; reply(226, "Transfer complete."); return (0); 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) { off_t offset; int err; len = filesize; err = cnt = offset = 0; while (err != -1 && cnt < filesize) { err = sendfile(filefd, netfd, offset, len, (struct sf_hdtr *) NULL, &cnt, 0); if (recvurg) goto got_oob; byte_count += cnt; offset += cnt; len -= cnt; if (err == -1) { if (!cnt) goto oldway; goto data_err; } } reply(226, "Transfer complete."); return (0); } oldway: if ((buf = malloc((u_int)blksize)) == NULL) { transflag = 0; perror_reply(451, "Local resource failure: malloc"); return (-1); } 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 (0); default: transflag = 0; reply(550, "Unimplemented TYPE %d in send_data", type); return (-1); } data_err: transflag = 0; perror_reply(426, "Data connection"); return (-1); file_err: transflag = 0; perror_reply(551, "Error on input file"); return (-1); got_oob: myoob(); recvurg = 0; transflag = 0; return (-1); } /* * 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; char buf[BUFSIZ]; transflag++; bare_lfs = 0; switch (type) { case TYPE_I: case TYPE_L: while ((cnt = read(fileno(instr), buf, sizeof(buf))) > 0) { if (recvurg) goto got_oob; if (write(fileno(outstr), buf, cnt) != cnt) goto file_err; byte_count += cnt; } if (recvurg) goto got_oob; 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) { if (recvurg) goto got_oob; 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: ; } if (recvurg) goto got_oob; 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); got_oob: myoob(); recvurg = 0; transflag = 0; return (-1); } void statfilecmd(filename) char *filename; { FILE *fin; int c; char line[LINE_MAX]; (void)snprintf(line, sizeof(line), _PATH_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() { union sockunion *su; u_char *a, *p; char hname[INET6_ADDRSTRLEN]; int ispassive; lreply(211, "%s FTP server status:", hostname, version); printf(" %s\r\n", version); printf(" Connected to %s", remotehost); if (!getnameinfo((struct sockaddr *)&his_addr, his_addr.su_len, hname, sizeof(hname) - 1, NULL, 0, NI_NUMERICHOST|NI_WITHSCOPEID)) { if (strcmp(hname, remotehost) != 0) printf(" (%s)", hname); } 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) { ispassive = 1; su = &pasv_addr; goto printaddr; } else if (usedefault == 0) { ispassive = 0; su = &data_dest; printaddr: #define UC(b) (((int) b) & 0xff) if (epsvall) { printf(" EPSV only mode (EPSV ALL)\r\n"); goto epsvonly; } /* PORT/PASV */ if (su->su_family == AF_INET) { a = (u_char *) &su->su_sin.sin_addr; p = (u_char *) &su->su_sin.sin_port; printf(" %s (%d,%d,%d,%d,%d,%d)\r\n", ispassive ? "PASV" : "PORT", UC(a[0]), UC(a[1]), UC(a[2]), UC(a[3]), UC(p[0]), UC(p[1])); } /* LPRT/LPSV */ { int alen, af, i; switch (su->su_family) { case AF_INET: a = (u_char *) &su->su_sin.sin_addr; p = (u_char *) &su->su_sin.sin_port; alen = sizeof(su->su_sin.sin_addr); af = 4; break; case AF_INET6: a = (u_char *) &su->su_sin6.sin6_addr; p = (u_char *) &su->su_sin6.sin6_port; alen = sizeof(su->su_sin6.sin6_addr); af = 6; break; default: af = 0; break; } if (af) { printf(" %s (%d,%d,", ispassive ? "LPSV" : "LPRT", af, alen); for (i = 0; i < alen; i++) printf("%d,", UC(a[i])); printf("%d,%d,%d)\r\n", 2, UC(p[0]), UC(p[1])); } } epsvonly:; /* EPRT/EPSV */ { int af; switch (su->su_family) { case AF_INET: af = 1; break; case AF_INET6: af = 2; break; default: af = 0; break; } if (af) { if (!getnameinfo((struct sockaddr *)su, su->su_len, hname, sizeof(hname) - 1, NULL, 0, NI_NUMERICHOST)) { printf(" %s |%d|%s|%d|\r\n", ispassive ? "EPSV" : "EPRT", af, hname, htons(su->su_port)); } } } #undef UC } else printf(" No data connection\r\n"); reply(211, "End of status"); } void fatalerror(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 (ftpdebug) { 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 (ftpdebug) { 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; { struct stat st; LOGCMD2("rename", from, to); if (guest && (stat(to, &st) == 0)) { reply(550, "%s: permission denied", to); return; } if (rename(from, to) < 0) perror_reply(550, "rename"); else ack("RNTO"); } static void dolog(who) struct sockaddr *who; { int error; realhostname_sa(remotehost, sizeof(remotehost) - 1, who, who->sa_len); #ifdef SETPROCTITLE #ifdef VIRTUAL_HOSTING if (thishost != firsthost) snprintf(proctitle, sizeof(proctitle), "%s: connected (to %s)", remotehost, hostname); else #endif snprintf(proctitle, sizeof(proctitle), "%s: connected", remotehost); setproctitle("%s", proctitle); #endif /* SETPROCTITLE */ if (logging) { #ifdef VIRTUAL_HOSTING if (thishost != firsthost) syslog(LOG_INFO, "connection from %s (to %s)", remotehost, hostname); else #endif { char who_name[MAXHOSTNAMELEN]; error = getnameinfo(who, who->sa_len, who_name, sizeof(who_name) - 1, NULL, 0, NI_NUMERICHOST|NI_WITHSCOPEID); syslog(LOG_INFO, "connection from %s (%s)", remotehost, error == 0 ? who_name : ""); } } } /* * Record logout in wtmp file * and exit with supplied status. */ void dologout(status) int status; { /* * Prevent reception of SIGURG from resulting in a resumption * back to the main program loop. */ transflag = 0; if (logged_in) { (void) seteuid((uid_t)0); ftpd_logwtmp(ttyline, "", NULL); } /* beware of flushing buffers after a SIGPIPE */ _exit(status); } static void sigurg(signo) int signo; { recvurg = 1; } static void myoob() { 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"); } if (strcmp(cp, "STAT\r\n") == 0) { tmpline[0] = '\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; char *p, *a; if (pdata >= 0) /* close old port if one set */ close(pdata); pdata = socket(ctrl_addr.su_family, SOCK_STREAM, 0); if (pdata < 0) { perror_reply(425, "Can't open passive connection"); return; } (void) seteuid((uid_t)0); #ifdef IP_PORTRANGE if (ctrl_addr.su_family == AF_INET) { int on = restricted_data_ports ? IP_PORTRANGE_HIGH : IP_PORTRANGE_DEFAULT; if (setsockopt(pdata, IPPROTO_IP, IP_PORTRANGE, (char *)&on, sizeof(on)) < 0) goto pasv_error; } #endif #ifdef IPV6_PORTRANGE if (ctrl_addr.su_family == AF_INET6) { int on = restricted_data_ports ? IPV6_PORTRANGE_HIGH : IPV6_PORTRANGE_DEFAULT; if (setsockopt(pdata, IPPROTO_IPV6, IPV6_PORTRANGE, (char *)&on, sizeof(on)) < 0) goto pasv_error; } #endif pasv_addr = ctrl_addr; pasv_addr.su_port = 0; if (bind(pdata, (struct sockaddr *)&pasv_addr, pasv_addr.su_len) < 0) goto pasv_error; (void) seteuid((uid_t)pw->pw_uid); len = sizeof(pasv_addr); if (getsockname(pdata, (struct sockaddr *) &pasv_addr, &len) < 0) goto pasv_error; if (listen(pdata, 1) < 0) goto pasv_error; if (pasv_addr.su_family == AF_INET) a = (char *) &pasv_addr.su_sin.sin_addr; else if (pasv_addr.su_family == AF_INET6 && IN6_IS_ADDR_V4MAPPED(&pasv_addr.su_sin6.sin6_addr)) a = (char *) &pasv_addr.su_sin6.sin6_addr.s6_addr[12]; else goto pasv_error; p = (char *) &pasv_addr.su_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) seteuid((uid_t)pw->pw_uid); (void) close(pdata); pdata = -1; perror_reply(425, "Can't open passive connection"); return; } /* * Long Passive defined in RFC 1639. * 228 Entering Long Passive Mode * (af, hal, h1, h2, h3,..., pal, p1, p2...) */ void long_passive(cmd, pf) char *cmd; int pf; { int len; char *p, *a; if (pdata >= 0) /* close old port if one set */ close(pdata); if (pf != PF_UNSPEC) { if (ctrl_addr.su_family != pf) { switch (ctrl_addr.su_family) { case AF_INET: pf = 1; break; case AF_INET6: pf = 2; break; default: pf = 0; break; } /* * XXX * only EPRT/EPSV ready clients will understand this */ if (strcmp(cmd, "EPSV") == 0 && pf) { reply(522, "Network protocol mismatch, " "use (%d)", pf); } else reply(501, "Network protocol mismatch"); /*XXX*/ return; } } pdata = socket(ctrl_addr.su_family, SOCK_STREAM, 0); if (pdata < 0) { perror_reply(425, "Can't open passive connection"); return; } (void) seteuid((uid_t)0); pasv_addr = ctrl_addr; pasv_addr.su_port = 0; len = pasv_addr.su_len; #ifdef IP_PORTRANGE if (ctrl_addr.su_family == AF_INET) { int on = restricted_data_ports ? IP_PORTRANGE_HIGH : IP_PORTRANGE_DEFAULT; if (setsockopt(pdata, IPPROTO_IP, IP_PORTRANGE, (char *)&on, sizeof(on)) < 0) goto pasv_error; } #endif #ifdef IPV6_PORTRANGE if (ctrl_addr.su_family == AF_INET6) { int on = restricted_data_ports ? IPV6_PORTRANGE_HIGH : IPV6_PORTRANGE_DEFAULT; if (setsockopt(pdata, IPPROTO_IPV6, IPV6_PORTRANGE, (char *)&on, sizeof(on)) < 0) goto pasv_error; } #endif if (bind(pdata, (struct sockaddr *)&pasv_addr, len) < 0) goto pasv_error; (void) seteuid((uid_t)pw->pw_uid); if (getsockname(pdata, (struct sockaddr *) &pasv_addr, &len) < 0) goto pasv_error; if (listen(pdata, 1) < 0) goto pasv_error; #define UC(b) (((int) b) & 0xff) if (strcmp(cmd, "LPSV") == 0) { p = (char *)&pasv_addr.su_port; switch (pasv_addr.su_family) { case AF_INET: a = (char *) &pasv_addr.su_sin.sin_addr; v4_reply: reply(228, "Entering Long Passive Mode (%d,%d,%d,%d,%d,%d,%d,%d,%d)", 4, 4, UC(a[0]), UC(a[1]), UC(a[2]), UC(a[3]), 2, UC(p[0]), UC(p[1])); return; case AF_INET6: if (IN6_IS_ADDR_V4MAPPED(&pasv_addr.su_sin6.sin6_addr)) { a = (char *) &pasv_addr.su_sin6.sin6_addr.s6_addr[12]; goto v4_reply; } a = (char *) &pasv_addr.su_sin6.sin6_addr; 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)", 6, 16, UC(a[0]), UC(a[1]), UC(a[2]), UC(a[3]), UC(a[4]), UC(a[5]), UC(a[6]), UC(a[7]), UC(a[8]), UC(a[9]), UC(a[10]), UC(a[11]), UC(a[12]), UC(a[13]), UC(a[14]), UC(a[15]), 2, UC(p[0]), UC(p[1])); return; } } else if (strcmp(cmd, "EPSV") == 0) { switch (pasv_addr.su_family) { case AF_INET: case AF_INET6: reply(229, "Entering Extended Passive Mode (|||%d|)", ntohs(pasv_addr.su_port)); return; } } else { /* more proper error code? */ } pasv_error: (void) seteuid((uid_t)pw->pw_uid); (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; 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 = '/'; /* -4 is for the .nn we put on the end below */ (void) snprintf(new, sizeof(new) - 4, "%s", local); cp = new + strlen(new); *cp++ = '.'; for (count = 1; count < 100; count++) { (void)sprintf(cp, "%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)); gl.gl_matchc = MAXGLOBARGS; flags |= GLOB_LIMIT; 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; } 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(_PATH_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 (recvurg) { myoob(); recvurg = 0; transflag = 0; goto out; } 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); } } void reapchild(signo) int signo; { while (wait3(NULL, WNOHANG, NULL) > 0); } #ifdef OLD_SETPROCTITLE /* * Clobber argv so ps will show what we're doing. (Stolen from sendmail.) * Warning, since this is usually started from inetd.conf, it often doesn't * have much of an environment or arglist to overwrite. */ void #if __STDC__ setproctitle(const char *fmt, ...) #else setproctitle(fmt, va_alist) char *fmt; va_dcl #endif { int i; va_list ap; char *p, *bp, ch; char buf[LINE_MAX]; #if __STDC__ va_start(ap, fmt); #else va_start(ap); #endif (void)vsnprintf(buf, sizeof(buf), fmt, ap); /* make ps print our process name */ p = Argv[0]; *p++ = '-'; i = strlen(buf); if (i > LastArgv - p - 2) { i = LastArgv - p - 2; buf[i] = '\0'; } bp = buf; while (ch = *bp++) if (ch != '\n' && ch != '\r') *p++ = ch; while (p < LastArgv) *p++ = ' '; } #endif /* OLD_SETPROCTITLE */ static void logxfer(name, size, start) char *name; off_t size; time_t start; { char buf[1024]; char path[MAXPATHLEN + 1]; time_t now; if (statfd >= 0 && getwd(path) != NULL) { time(&now); snprintf(buf, sizeof(buf), "%.20s!%s!%s!%s/%s!%qd!%ld\n", ctime(&now)+4, ident, remotehost, path, name, (long long)size, (long)(now - start + (now == start))); write(statfd, buf, strlen(buf)); } }