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-rw-r--r--crypto/heimdal/appl/ftp/ftpd/ftpd.c2249
1 files changed, 2249 insertions, 0 deletions
diff --git a/crypto/heimdal/appl/ftp/ftpd/ftpd.c b/crypto/heimdal/appl/ftp/ftpd/ftpd.c
new file mode 100644
index 0000000..8c5ddf3
--- /dev/null
+++ b/crypto/heimdal/appl/ftp/ftpd/ftpd.c
@@ -0,0 +1,2249 @@
+/*
+ * 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.
+ */
+
+#define FTP_NAMES
+#include "ftpd_locl.h"
+#ifdef KRB5
+#include <krb5.h>
+#endif
+#include "getarg.h"
+
+RCSID("$Id: ftpd.c,v 1.137 2000/01/05 13:46:04 joda Exp $");
+
+static char version[] = "Version 6.00";
+
+extern off_t restart_point;
+extern char cbuf[];
+
+struct sockaddr_storage ctrl_addr_ss;
+struct sockaddr *ctrl_addr = (struct sockaddr *)&ctrl_addr_ss;
+
+struct sockaddr_storage data_source_ss;
+struct sockaddr *data_source = (struct sockaddr *)&data_source_ss;
+
+struct sockaddr_storage data_dest_ss;
+struct sockaddr *data_dest = (struct sockaddr *)&data_dest_ss;
+
+struct sockaddr_storage his_addr_ss;
+struct sockaddr *his_addr = (struct sockaddr *)&his_addr_ss;
+
+struct sockaddr_storage pasv_addr_ss;
+struct sockaddr *pasv_addr = (struct sockaddr *)&pasv_addr_ss;
+
+int data;
+jmp_buf errcatch, urgcatch;
+int oobflag;
+int logged_in;
+struct passwd *pw;
+int debug = 0;
+int ftpd_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 guest;
+int dochroot;
+int type;
+int form;
+int stru; /* avoid C keyword */
+int mode;
+int usedefault = 1; /* for data transfers */
+int pdata = -1; /* for passive mode */
+int 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 */
+int guest_umask = 0777; /* Paranoia for anonymous users */
+char tmpline[10240];
+char hostname[MaxHostNameLen];
+char remotehost[MaxHostNameLen];
+static char ttyline[20];
+
+#define AUTH_PLAIN (1 << 0) /* allow sending passwords */
+#define AUTH_OTP (1 << 1) /* passwords are one-time */
+#define AUTH_FTP (1 << 2) /* allow anonymous login */
+
+static int auth_level = 0; /* Only allow kerberos login by default */
+
+/*
+ * 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 HAVE_SETPROCTITLE
+char proctitle[BUFSIZ]; /* initial part of title */
+#endif /* HAVE_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 = %ld bytes", \
+ cmd, (*(file) == '/') ? "" : curdir(), file, (long)cnt); \
+ }
+
+static void ack (char *);
+static void myoob (int);
+static int checkuser (char *, char *);
+static int checkaccess (char *);
+static FILE *dataconn (const char *, off_t, const char *);
+static void dolog (struct sockaddr *sa, int len);
+static void end_login (void);
+static FILE *getdatasock (const char *);
+static char *gunique (char *);
+static RETSIGTYPE lostconn (int);
+static int receive_data (FILE *, FILE *);
+static void send_data (FILE *, FILE *);
+static struct passwd * sgetpwnam (char *);
+
+static char *
+curdir(void)
+{
+ static char path[MaxPathLen+1]; /* path + '/' + '\0' */
+
+ if (getcwd(path, sizeof(path)-1) == NULL)
+ return ("");
+ if (path[1] != '\0') /* special case for root dir. */
+ strlcat(path, "/", sizeof(path));
+ /* For guest account, skip / since it's chrooted */
+ return (guest ? path+1 : path);
+}
+
+#ifndef LINE_MAX
+#define LINE_MAX 1024
+#endif
+
+static int
+parse_auth_level(char *str)
+{
+ char *p;
+ int ret = 0;
+ char *foo = NULL;
+
+ for(p = strtok_r(str, ",", &foo);
+ p;
+ p = strtok_r(NULL, ",", &foo)) {
+ if(strcmp(p, "user") == 0)
+ ;
+#ifdef OTP
+ else if(strcmp(p, "otp") == 0)
+ ret |= AUTH_PLAIN|AUTH_OTP;
+#endif
+ else if(strcmp(p, "ftp") == 0 ||
+ strcmp(p, "safe") == 0)
+ ret |= AUTH_FTP;
+ else if(strcmp(p, "plain") == 0)
+ ret |= AUTH_PLAIN;
+ else if(strcmp(p, "none") == 0)
+ ret |= AUTH_PLAIN|AUTH_FTP;
+ else
+ warnx("bad value for -a: `%s'", p);
+ }
+ return ret;
+}
+
+/*
+ * Print usage and die.
+ */
+
+static int debug_flag;
+static int interactive_flag;
+static char *guest_umask_string;
+static char *port_string;
+static char *umask_string;
+static char *auth_string;
+
+int use_builtin_ls = -1;
+
+static int help_flag;
+static int version_flag;
+
+struct getargs args[] = {
+ { NULL, 'a', arg_string, &auth_string, "required authentication" },
+ { NULL, 'i', arg_flag, &interactive_flag, "don't assume stdin is a socket" },
+ { NULL, 'p', arg_string, &port_string, "what port to listen to" },
+ { NULL, 'g', arg_string, &guest_umask_string, "umask for guest logins" },
+ { NULL, 'l', arg_counter, &logging, "log more stuff", "" },
+ { NULL, 't', arg_integer, &ftpd_timeout, "initial timeout" },
+ { NULL, 'T', arg_integer, &maxtimeout, "max timeout" },
+ { NULL, 'u', arg_string, &umask_string, "umask for user logins" },
+ { NULL, 'd', arg_flag, &debug_flag, "enable debugging" },
+ { NULL, 'v', arg_flag, &debug_flag, "enable debugging" },
+ { "builtin-ls", 'B', arg_flag, &use_builtin_ls, "use built-in ls to list files" },
+ { "version", 0, arg_flag, &version_flag },
+ { "help", 'h', arg_flag, &help_flag }
+};
+
+static int num_args = sizeof(args) / sizeof(args[0]);
+
+static void
+usage (int code)
+{
+ arg_printusage(args, num_args, NULL, "");
+ exit (code);
+}
+
+/* output contents of a file */
+static int
+show_file(const char *file, int code)
+{
+ FILE *f;
+ char buf[128];
+
+ f = fopen(file, "r");
+ if(f == NULL)
+ return -1;
+ while(fgets(buf, sizeof(buf), f)){
+ buf[strcspn(buf, "\r\n")] = '\0';
+ lreply(code, "%s", buf);
+ }
+ fclose(f);
+ return 0;
+}
+
+int
+main(int argc, char **argv)
+{
+ int his_addr_len, ctrl_addr_len, on = 1, tos;
+ char *cp, line[LINE_MAX];
+ FILE *fd;
+ int port;
+ struct servent *sp;
+
+ int optind = 0;
+
+ set_progname (argv[0]);
+
+#ifdef KRB4
+ /* detach from any tickets and tokens */
+ {
+ char tkfile[1024];
+ snprintf(tkfile, sizeof(tkfile),
+ "/tmp/ftp_%u", (unsigned)getpid());
+ krb_set_tkt_string(tkfile);
+ if(k_hasafs())
+ k_setpag();
+ }
+#endif
+ if(getarg(args, num_args, argc, argv, &optind))
+ usage(1);
+
+ if(help_flag)
+ usage(0);
+
+ if(version_flag) {
+ print_version(NULL);
+ exit(0);
+ }
+
+ if(auth_string)
+ auth_level = parse_auth_level(auth_string);
+ {
+ char *p;
+ long val = 0;
+
+ if(guest_umask_string) {
+ val = strtol(guest_umask_string, &p, 8);
+ if (*p != '\0' || val < 0)
+ warnx("bad value for -g");
+ else
+ guest_umask = val;
+ }
+ if(umask_string) {
+ val = strtol(umask_string, &p, 8);
+ if (*p != '\0' || val < 0)
+ warnx("bad value for -u");
+ else
+ defumask = val;
+ }
+ }
+ if(port_string) {
+ sp = getservbyname(port_string, "tcp");
+ if(sp)
+ port = sp->s_port;
+ else
+ if(isdigit(port_string[0]))
+ port = htons(atoi(port_string));
+ else
+ warnx("bad value for -p");
+ } else {
+ sp = getservbyname("ftp", "tcp");
+ if(sp)
+ port = sp->s_port;
+ else
+ port = htons(21);
+ }
+
+ if (maxtimeout < ftpd_timeout)
+ maxtimeout = ftpd_timeout;
+
+#if 0
+ if (ftpd_timeout > maxtimeout)
+ ftpd_timeout = maxtimeout;
+#endif
+
+ if(interactive_flag)
+ mini_inetd (port);
+
+ /*
+ * 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);
+ his_addr_len = sizeof(his_addr_ss);
+ if (getpeername(STDIN_FILENO, his_addr, &his_addr_len) < 0) {
+ syslog(LOG_ERR, "getpeername (%s): %m",argv[0]);
+ exit(1);
+ }
+ ctrl_addr_len = sizeof(ctrl_addr_ss);
+ if (getsockname(STDIN_FILENO, ctrl_addr, &ctrl_addr_len) < 0) {
+ syslog(LOG_ERR, "getsockname (%s): %m",argv[0]);
+ exit(1);
+ }
+#if defined(IP_TOS) && defined(HAVE_SETSOCKOPT)
+ tos = IPTOS_LOWDELAY;
+ if (setsockopt(STDIN_FILENO, IPPROTO_IP, IP_TOS,
+ (void *)&tos, sizeof(int)) < 0)
+ syslog(LOG_WARNING, "setsockopt (IP_TOS): %m");
+#endif
+ data_source->sa_family = ctrl_addr->sa_family;
+ socket_set_port (data_source,
+ htons(ntohs(socket_get_port(ctrl_addr)) - 1));
+
+ /* set this here so it can be put in wtmp */
+ snprintf(ttyline, sizeof(ttyline), "ftp%u", (unsigned)getpid());
+
+
+ /* freopen(_PATH_DEVNULL, "w", stderr); */
+ signal(SIGPIPE, lostconn);
+ signal(SIGCHLD, SIG_IGN);
+#ifdef SIGURG
+ if (signal(SIGURG, myoob) == SIG_ERR)
+ syslog(LOG_ERR, "signal: %m");
+#endif
+
+ /* Try to handle urgent data inline */
+#if defined(SO_OOBINLINE) && defined(HAVE_SETSOCKOPT)
+ if (setsockopt(0, SOL_SOCKET, SO_OOBINLINE, (void *)&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, his_addr_len);
+ /*
+ * 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(show_file(_PATH_NOLOGIN, 530) == 0) {
+ reply(530, "System not available.");
+ exit(0);
+ }
+ show_file(_PATH_FTPWELCOME, 220);
+ /* reply(220,) must follow */
+ gethostname(hostname, sizeof(hostname));
+
+ reply(220, "%s FTP server (%s"
+#ifdef KRB5
+ "+%s"
+#endif
+#ifdef KRB4
+ "+%s"
+#endif
+ ") ready.", hostname, version
+#ifdef KRB5
+ ,heimdal_version
+#endif
+#ifdef KRB4
+ ,krb4_version
+#endif
+ );
+
+ setjmp(errcatch);
+ for (;;)
+ yyparse();
+ /* NOTREACHED */
+}
+
+static RETSIGTYPE
+lostconn(int signo)
+{
+
+ if (debug)
+ syslog(LOG_DEBUG, "lost connection");
+ dologout(-1);
+}
+
+/*
+ * Helper function for sgetpwnam().
+ */
+static char *
+sgetsave(char *s)
+{
+ char *new = strdup(s);
+
+ if (new == NULL) {
+ perror_reply(421, "Local resource failure: malloc");
+ dologout(1);
+ /* NOTREACHED */
+ }
+ 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(char *name)
+{
+ static struct passwd save;
+ struct passwd *p;
+
+ if ((p = k_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[10]; /* current USER name */
+#ifdef OTP
+OtpContext otp_ctx;
+#endif
+
+/*
+ * 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(char *name)
+{
+ char *cp, *shell;
+
+ if(auth_level == 0 && !sec_complete){
+ reply(530, "No login allowed without authorization.");
+ return;
+ }
+
+ 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 ((auth_level & AUTH_FTP) == 0 ||
+ checkaccess("ftp") ||
+ checkaccess("anonymous"))
+ reply(530, "User %s access denied.", name);
+ else if ((pw = sgetpwnam("ftp")) != NULL) {
+ guest = 1;
+ defumask = guest_umask; /* paranoia for incoming */
+ askpasswd = 1;
+ reply(331, "Guest login ok, type your name as password.");
+ } else
+ reply(530, "User %s unknown.", name);
+ if (!askpasswd && logging) {
+ char data_addr[256];
+
+ if (inet_ntop (his_addr->sa_family,
+ socket_get_address(his_addr),
+ data_addr, sizeof(data_addr)) == NULL)
+ strlcpy (data_addr, "unknown address",
+ sizeof(data_addr));
+
+ syslog(LOG_NOTICE,
+ "ANONYMOUS FTP LOGIN REFUSED FROM %s(%s)",
+ remotehost, data_addr);
+ }
+ return;
+ }
+ if((auth_level & AUTH_PLAIN) == 0 && !sec_complete){
+ reply(530, "Only authorized and anonymous login 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 || checkaccess(name)) {
+ reply(530, "User %s access denied.", name);
+ if (logging) {
+ char data_addr[256];
+
+ if (inet_ntop (his_addr->sa_family,
+ socket_get_address(his_addr),
+ data_addr,
+ sizeof(data_addr)) == NULL)
+ strlcpy (data_addr,
+ "unknown address",
+ sizeof(data_addr));
+
+ syslog(LOG_NOTICE,
+ "FTP LOGIN REFUSED FROM %s(%s), %s",
+ remotehost,
+ data_addr,
+ name);
+ }
+ pw = (struct passwd *) NULL;
+ return;
+ }
+ }
+ if (logging)
+ strlcpy(curname, name, sizeof(curname));
+ if(sec_complete) {
+ if(sec_userok(name) == 0)
+ do_login(232, name);
+ else
+ reply(530, "User %s access denied.", name);
+ } else {
+ char ss[256];
+
+#ifdef OTP
+ if (otp_challenge(&otp_ctx, name, ss, sizeof(ss)) == 0) {
+ reply(331, "Password %s for %s required.",
+ ss, name);
+ askpasswd = 1;
+ } else
+#endif
+ if ((auth_level & AUTH_OTP) == 0) {
+ reply(331, "Password required for %s.", name);
+ askpasswd = 1;
+ } else {
+ char *s;
+
+#ifdef OTP
+ if ((s = otp_error (&otp_ctx)) != NULL)
+ lreply(530, "OTP: %s", s);
+#endif
+ reply(530,
+ "Only authorized, anonymous"
+#ifdef OTP
+ " and OTP "
+#endif
+ "login allowed.");
+ }
+
+ }
+ /*
+ * Delay before reading passwd after first failed
+ * attempt to slow down passwd-guessing programs.
+ */
+ if (login_attempts)
+ sleep(login_attempts);
+}
+
+/*
+ * Check if a user is in the file "fname"
+ */
+static int
+checkuser(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;
+ }
+ }
+ fclose(fd);
+ }
+ return (found);
+}
+
+
+/*
+ * Determine whether a user has access, based on information in
+ * _PATH_FTPUSERS. The users are listed one per line, with `allow'
+ * or `deny' after the username. If anything other than `allow', or
+ * just nothing, is given after the username, `deny' is assumed.
+ *
+ * If the user is not found in the file, but the pseudo-user `*' is,
+ * the permission is taken from that line.
+ *
+ * This preserves the old semantics where if a user was listed in the
+ * file he was denied, otherwise he was allowed.
+ *
+ * Return 1 if the user is denied, or 0 if he is allowed. */
+
+static int
+match(const char *pattern, const char *string)
+{
+ return fnmatch(pattern, string, FNM_NOESCAPE);
+}
+
+static int
+checkaccess(char *name)
+{
+#define ALLOWED 0
+#define NOT_ALLOWED 1
+ FILE *fd;
+ int allowed = ALLOWED;
+ char *user, *perm, line[BUFSIZ];
+ char *foo;
+
+ fd = fopen(_PATH_FTPUSERS, "r");
+
+ if(fd == NULL)
+ return allowed;
+
+ while (fgets(line, sizeof(line), fd) != NULL) {
+ foo = NULL;
+ user = strtok_r(line, " \t\n", &foo);
+ if (user == NULL || user[0] == '#')
+ continue;
+ perm = strtok_r(NULL, " \t\n", &foo);
+ if (match(user, name) == 0){
+ if(perm && strcmp(perm, "allow") == 0)
+ allowed = ALLOWED;
+ else
+ allowed = NOT_ALLOWED;
+ break;
+ }
+ }
+ fclose(fd);
+ return allowed;
+}
+#undef ALLOWED
+#undef NOT_ALLOWED
+
+
+int do_login(int code, char *passwd)
+{
+ FILE *fd;
+ login_attempts = 0; /* this time successful */
+ if (setegid((gid_t)pw->pw_gid) < 0) {
+ reply(550, "Can't set gid.");
+ return -1;
+ }
+ initgroups(pw->pw_name, pw->pw_gid);
+
+ /* open wtmp before chroot */
+ ftpd_logwtmp(ttyline, pw->pw_name, remotehost);
+ logged_in = 1;
+
+ dochroot = checkuser(_PATH_FTPCHROOT, pw->pw_name);
+ 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.");
+ return -1;
+ }
+ } else if (dochroot) {
+ if (chroot(pw->pw_dir) < 0 || chdir("/") < 0) {
+ reply(550, "Can't change root.");
+ return -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);
+ return -1;
+ } else
+ lreply(code, "No directory! Logging in with home=/");
+ }
+ if (seteuid((uid_t)pw->pw_uid) < 0) {
+ reply(550, "Can't set uid.");
+ return -1;
+ }
+
+ if(use_builtin_ls == -1) {
+ struct stat st;
+ /* if /bin/ls exist and is a regular file, use it, otherwise
+ use built-in ls */
+ if(stat("/bin/ls", &st) == 0 &&
+ S_ISREG(st.st_mode))
+ use_builtin_ls = 0;
+ else
+ use_builtin_ls = 1;
+ }
+
+ /*
+ * Display a login message, if it exists.
+ * N.B. reply(code,) must follow the message.
+ */
+ show_file(_PATH_FTPLOGINMESG, code);
+ if(show_file(_PATH_ISSUE_NET, code) != 0)
+ show_file(_PATH_ISSUE, code);
+ if (guest) {
+ reply(code, "Guest login ok, access restrictions apply.");
+#ifdef HAVE_SETPROCTITLE
+ snprintf (proctitle, sizeof(proctitle),
+ "%s: anonymous/%s",
+ remotehost,
+ passwd);
+ setproctitle(proctitle);
+#endif /* HAVE_SETPROCTITLE */
+ if (logging) {
+ char data_addr[256];
+
+ if (inet_ntop (his_addr->sa_family,
+ socket_get_address(his_addr),
+ data_addr, sizeof(data_addr)) == NULL)
+ strlcpy (data_addr, "unknown address",
+ sizeof(data_addr));
+
+ syslog(LOG_INFO, "ANONYMOUS FTP LOGIN FROM %s(%s), %s",
+ remotehost,
+ data_addr,
+ passwd);
+ }
+ } else {
+ reply(code, "User %s logged in.", pw->pw_name);
+#ifdef HAVE_SETPROCTITLE
+ snprintf(proctitle, sizeof(proctitle), "%s: %s", remotehost, pw->pw_name);
+ setproctitle(proctitle);
+#endif /* HAVE_SETPROCTITLE */
+ if (logging) {
+ char data_addr[256];
+
+ if (inet_ntop (his_addr->sa_family,
+ socket_get_address(his_addr),
+ data_addr, sizeof(data_addr)) == NULL)
+ strlcpy (data_addr, "unknown address",
+ sizeof(data_addr));
+
+ syslog(LOG_INFO, "FTP LOGIN FROM %s(%s) as %s",
+ remotehost,
+ data_addr,
+ pw->pw_name);
+ }
+ }
+ umask(defumask);
+ return 0;
+}
+
+/*
+ * 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)
+ ftpd_logwtmp(ttyline, "", "");
+ pw = NULL;
+ logged_in = 0;
+ guest = 0;
+ dochroot = 0;
+}
+
+void
+pass(char *passwd)
+{
+ int rval;
+
+ /* some clients insists on sending a password */
+ if (logged_in && askpasswd == 0){
+ reply(230, "Dumpucko!");
+ return;
+ }
+
+ if (logged_in || askpasswd == 0) {
+ reply(503, "Login with USER first.");
+ return;
+ }
+ askpasswd = 0;
+ rval = 1;
+ if (!guest) { /* "ftp" is only account allowed no password */
+ if (pw == NULL)
+ rval = 1; /* failure below */
+#ifdef OTP
+ else if (otp_verify_user (&otp_ctx, passwd) == 0) {
+ rval = 0;
+ }
+#endif
+ else if((auth_level & AUTH_OTP) == 0) {
+#ifdef KRB4
+ char realm[REALM_SZ];
+ if((rval = krb_get_lrealm(realm, 1)) == KSUCCESS)
+ rval = krb_verify_user(pw->pw_name,
+ "", realm,
+ passwd,
+ KRB_VERIFY_SECURE, NULL);
+ if (rval == KSUCCESS ) {
+ chown (tkt_string(), pw->pw_uid, pw->pw_gid);
+ if(k_hasafs())
+ krb_afslog(0, 0);
+ } else
+#endif
+ rval = unix_verify_user(pw->pw_name, passwd);
+ } else {
+ char *s;
+
+#ifdef OTP
+ if ((s = otp_error(&otp_ctx)) != NULL)
+ lreply(530, "OTP: %s", s);
+#endif
+ }
+ memset (passwd, 0, strlen(passwd));
+
+ /*
+ * If rval == 1, the user failed the authentication
+ * check above. If rval == 0, either Kerberos or
+ * local authentication succeeded.
+ */
+ if (rval) {
+ char data_addr[256];
+
+ if (inet_ntop (his_addr->sa_family,
+ socket_get_address(his_addr),
+ data_addr, sizeof(data_addr)) == NULL)
+ strlcpy (data_addr, "unknown address",
+ sizeof(data_addr));
+
+ reply(530, "Login incorrect.");
+ if (logging)
+ syslog(LOG_NOTICE,
+ "FTP LOGIN FAILED FROM %s(%s), %s",
+ remotehost,
+ data_addr,
+ curname);
+ pw = NULL;
+ if (login_attempts++ >= 5) {
+ syslog(LOG_NOTICE,
+ "repeated login failures from %s(%s)",
+ remotehost,
+ data_addr);
+ exit(0);
+ }
+ return;
+ }
+ }
+ if(!do_login(230, passwd))
+ return;
+
+ /* Forget all about it... */
+ end_login();
+}
+
+void
+retrieve(const char *cmd, char *name)
+{
+ FILE *fin = NULL, *dout;
+ struct stat st;
+ int (*closefunc) (FILE *);
+ char line[BUFSIZ];
+
+
+ if (cmd == 0) {
+ fin = fopen(name, "r");
+ closefunc = fclose;
+ st.st_size = 0;
+ if(fin == NULL){
+ int save_errno = errno;
+ struct cmds {
+ const char *ext;
+ const char *cmd;
+ const char *rev_cmd;
+ } cmds[] = {
+ {".tar", "/bin/gtar cPf - %s", NULL},
+ {".tar.gz", "/bin/gtar zcPf - %s", NULL},
+ {".tar.Z", "/bin/gtar ZcPf - %s", NULL},
+ {".gz", "/bin/gzip -c -- %s", "/bin/gzip -c -d -- %s"},
+ {".Z", "/bin/compress -c -- %s", "/bin/uncompress -c -- %s"},
+ {NULL, NULL}
+ };
+ struct cmds *p;
+ for(p = cmds; p->ext; p++){
+ char *tail = name + strlen(name) - strlen(p->ext);
+ char c = *tail;
+
+ if(strcmp(tail, p->ext) == 0 &&
+ (*tail = 0) == 0 &&
+ access(name, R_OK) == 0){
+ snprintf (line, sizeof(line), p->cmd, name);
+ *tail = c;
+ break;
+ }
+ *tail = c;
+ if (p->rev_cmd != NULL) {
+ char *ext;
+
+ asprintf(&ext, "%s%s", name, p->ext);
+ if (ext != NULL) {
+ if (access(ext, R_OK) == 0) {
+ snprintf (line, sizeof(line),
+ p->rev_cmd, ext);
+ free(ext);
+ break;
+ }
+ free(ext);
+ }
+ }
+
+ }
+ if(p->ext){
+ fin = ftpd_popen(line, "r", 0, 0);
+ closefunc = ftpd_pclose;
+ st.st_size = -1;
+ cmd = line;
+ } else
+ errno = save_errno;
+ }
+ } else {
+ snprintf(line, sizeof(line), cmd, name);
+ name = line;
+ fin = ftpd_popen(line, "r", 1, 0);
+ closefunc = ftpd_pclose;
+ st.st_size = -1;
+ }
+ if (fin == NULL) {
+ if (errno != 0) {
+ perror_reply(550, name);
+ if (cmd == 0) {
+ LOGCMD("get", name);
+ }
+ }
+ return;
+ }
+ byte_count = -1;
+ if (cmd == 0){
+ if(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, SEEK_SET) < 0) {
+ perror_reply(550, name);
+ goto done;
+ }
+ }
+ dout = dataconn(name, st.st_size, "w");
+ if (dout == NULL)
+ goto done;
+ set_buffer_size(fileno(dout), 0);
+ send_data(fin, dout);
+ fclose(dout);
+ data = -1;
+ pdata = -1;
+done:
+ if (cmd == 0)
+ LOGBYTES("get", name, byte_count);
+ (*closefunc)(fin);
+}
+
+/* filename sanity check */
+
+int
+filename_check(char *filename)
+{
+ static const char good_chars[] = "+-=_,.";
+ char *p;
+
+ p = strrchr(filename, '/');
+ if(p)
+ filename = p + 1;
+
+ p = filename;
+
+ if(isalnum(*p)){
+ p++;
+ while(*p && (isalnum(*p) || strchr(good_chars, *p)))
+ p++;
+ if(*p == '\0')
+ return 0;
+ }
+ lreply(553, "\"%s\" is an illegal filename.", filename);
+ lreply(553, "The filename must start with an alphanumeric "
+ "character and must only");
+ reply(553, "consist of alphanumeric characters or any of the following: %s",
+ good_chars);
+ return 1;
+}
+
+void
+do_store(char *name, char *mode, int unique)
+{
+ FILE *fout, *din;
+ struct stat st;
+ int (*closefunc) (FILE *);
+
+ if(guest && filename_check(name))
+ return;
+ 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, SEEK_CUR) < 0) {
+ perror_reply(550, name);
+ goto done;
+ }
+ } else if (lseek(fileno(fout), restart_point, SEEK_SET) < 0) {
+ perror_reply(550, name);
+ goto done;
+ }
+ }
+ din = dataconn(name, (off_t)-1, "r");
+ if (din == NULL)
+ goto done;
+ set_buffer_size(fileno(din), 1);
+ if (receive_data(din, fout) == 0) {
+ if (unique)
+ reply(226, "Transfer complete (unique file name:%s).",
+ name);
+ else
+ reply(226, "Transfer complete.");
+ }
+ fclose(din);
+ data = -1;
+ pdata = -1;
+done:
+ LOGBYTES(*mode == 'w' ? "put" : "append", name, byte_count);
+ (*closefunc)(fout);
+}
+
+static FILE *
+getdatasock(const char *mode)
+{
+ int s, t, tries;
+
+ if (data >= 0)
+ return (fdopen(data, mode));
+ seteuid(0);
+ s = socket(ctrl_addr->sa_family, SOCK_STREAM, 0);
+ if (s < 0)
+ goto bad;
+ socket_set_reuseaddr (s, 1);
+ /* anchor socket to avoid multi-homing problems */
+ socket_set_address_and_port (data_source,
+ socket_get_address (ctrl_addr),
+ socket_get_port (data_source));
+
+ for (tries = 1; ; tries++) {
+ if (bind(s, data_source,
+ socket_sockaddr_size (data_source)) >= 0)
+ break;
+ if (errno != EADDRINUSE || tries > 10)
+ goto bad;
+ sleep(tries);
+ }
+ seteuid(pw->pw_uid);
+#ifdef IPTOS_THROUGHPUT
+ socket_set_tos (s, IPTOS_THROUGHPUT);
+#endif
+ return (fdopen(s, mode));
+bad:
+ /* Return the real value of errno (close may change it) */
+ t = errno;
+ seteuid((uid_t)pw->pw_uid);
+ close(s);
+ errno = t;
+ return (NULL);
+}
+
+static FILE *
+dataconn(const char *name, off_t size, const char *mode)
+{
+ char sizebuf[32];
+ FILE *file;
+ int retry = 0;
+
+ file_size = size;
+ byte_count = 0;
+ if (size >= 0)
+ snprintf(sizebuf, sizeof(sizebuf), " (%ld bytes)", (long)size);
+ else
+ *sizebuf = '\0';
+ if (pdata >= 0) {
+ struct sockaddr_storage from_ss;
+ struct sockaddr *from = (struct sockaddr *)&from_ss;
+ int s;
+ int fromlen = sizeof(from_ss);
+
+ s = accept(pdata, from, &fromlen);
+ if (s < 0) {
+ reply(425, "Can't open data connection.");
+ close(pdata);
+ pdata = -1;
+ return (NULL);
+ }
+ close(pdata);
+ pdata = s;
+#if defined(IP_TOS) && defined(HAVE_SETSOCKOPT)
+ {
+ int tos = IPTOS_THROUGHPUT;
+
+ setsockopt(s, IPPROTO_IP, IP_TOS, (void *)&tos,
+ sizeof(tos));
+ }
+#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) {
+ char data_addr[256];
+
+ if (inet_ntop (data_source->sa_family,
+ socket_get_address(data_source),
+ data_addr, sizeof(data_addr)) == NULL)
+ strlcpy (data_addr, "unknown address",
+ sizeof(data_addr));
+
+ reply(425, "Can't create data socket (%s,%d): %s.",
+ data_addr,
+ socket_get_port (data_source),
+ strerror(errno));
+ return (NULL);
+ }
+ data = fileno(file);
+ while (connect(data, data_dest,
+ socket_sockaddr_size(data_dest)) < 0) {
+ if (errno == EADDRINUSE && retry < swaitmax) {
+ sleep(swaitint);
+ retry += swaitint;
+ continue;
+ }
+ perror_reply(425, "Can't build data connection");
+ 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(FILE *instr, FILE *outstr)
+{
+ int c, cnt, filefd, netfd;
+ static char *buf;
+ static size_t bufsize;
+
+ transflag++;
+ if (setjmp(urgcatch)) {
+ transflag = 0;
+ return;
+ }
+ switch (type) {
+
+ case TYPE_A:
+ while ((c = getc(instr)) != EOF) {
+ byte_count++;
+ if(c == '\n')
+ sec_putc('\r', outstr);
+ sec_putc(c, outstr);
+ }
+ sec_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:
+#if defined(HAVE_MMAP) && !defined(NO_MMAP)
+#ifndef MAP_FAILED
+#define MAP_FAILED (-1)
+#endif
+ {
+ struct stat st;
+ char *chunk;
+ int in = fileno(instr);
+ if(fstat(in, &st) == 0 && S_ISREG(st.st_mode)
+ && st.st_size > 0) {
+ /*
+ * mmap zero bytes has potential of loosing, don't do it.
+ */
+ chunk = mmap(0, st.st_size, PROT_READ,
+ MAP_SHARED, in, 0);
+ if((void *)chunk != (void *)MAP_FAILED) {
+ cnt = st.st_size - restart_point;
+ sec_write(fileno(outstr), chunk + restart_point, cnt);
+ if (munmap(chunk, st.st_size) < 0)
+ warn ("munmap");
+ sec_fflush(outstr);
+ byte_count = cnt;
+ transflag = 0;
+ }
+ }
+ }
+#endif
+ if(transflag) {
+ struct stat st;
+
+ netfd = fileno(outstr);
+ filefd = fileno(instr);
+ buf = alloc_buffer (buf, &bufsize,
+ fstat(filefd, &st) >= 0 ? &st : NULL);
+ if (buf == NULL) {
+ transflag = 0;
+ perror_reply(451, "Local resource failure: malloc");
+ return;
+ }
+ while ((cnt = read(filefd, buf, bufsize)) > 0 &&
+ sec_write(netfd, buf, cnt) == cnt)
+ byte_count += cnt;
+ sec_fflush(outstr); /* to end an encrypted stream */
+ transflag = 0;
+ 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(FILE *instr, FILE *outstr)
+{
+ int cnt, bare_lfs = 0;
+ static char *buf;
+ static size_t bufsize;
+ struct stat st;
+
+ transflag++;
+ if (setjmp(urgcatch)) {
+ transflag = 0;
+ return (-1);
+ }
+
+ buf = alloc_buffer (buf, &bufsize,
+ fstat(fileno(outstr), &st) >= 0 ? &st : NULL);
+ if (buf == NULL) {
+ transflag = 0;
+ perror_reply(451, "Local resource failure: malloc");
+ return -1;
+ }
+
+ switch (type) {
+
+ case TYPE_I:
+ case TYPE_L:
+ while ((cnt = sec_read(fileno(instr), buf, bufsize)) > 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:
+ {
+ char *p, *q;
+ int cr_flag = 0;
+ while ((cnt = sec_read(fileno(instr),
+ buf + cr_flag,
+ bufsize - cr_flag)) > 0){
+ byte_count += cnt;
+ cnt += cr_flag;
+ cr_flag = 0;
+ for(p = buf, q = buf; p < buf + cnt;) {
+ if(*p == '\n')
+ bare_lfs++;
+ if(*p == '\r') {
+ if(p == buf + cnt - 1){
+ cr_flag = 1;
+ p++;
+ continue;
+ }else if(p[1] == '\n'){
+ *q++ = '\n';
+ p += 2;
+ continue;
+ }
+ }
+ *q++ = *p++;
+ }
+ fwrite(buf, q - buf, 1, outstr);
+ if(cr_flag)
+ buf[0] = '\r';
+ }
+ if(cr_flag)
+ putc('\r', outstr);
+ 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\r\n"
+ " File may not have transferred correctly.\r\n",
+ bare_lfs);
+ }
+ 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(char *filename)
+{
+ FILE *fin;
+ int c;
+ char line[LINE_MAX];
+
+ snprintf(line, sizeof(line), "/bin/ls -la -- %s", filename);
+ fin = ftpd_popen(line, "r", 1, 0);
+ lreply(211, "status of %s:", filename);
+ while ((c = getc(fin)) != EOF) {
+ if (c == '\n') {
+ if (ferror(stdout)){
+ perror_reply(421, "control connection");
+ ftpd_pclose(fin);
+ dologout(1);
+ /* NOTREACHED */
+ }
+ if (ferror(fin)) {
+ perror_reply(551, filename);
+ ftpd_pclose(fin);
+ return;
+ }
+ putc('\r', stdout);
+ }
+ putc(c, stdout);
+ }
+ ftpd_pclose(fin);
+ reply(211, "End of Status");
+}
+
+void
+statcmd(void)
+{
+#if 0
+ struct sockaddr_in *sin;
+ u_char *a, *p;
+
+ lreply(211, "%s FTP server (%s) 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");
+#endif
+ reply(211, "End of status");
+}
+
+void
+fatal(char *s)
+{
+
+ reply(451, "Error in server: %s\n", s);
+ reply(221, "Closing connection due to server error.");
+ dologout(0);
+ /* NOTREACHED */
+}
+
+static void
+int_reply(int, char *, const char *, va_list)
+#ifdef __GNUC__
+__attribute__ ((format (printf, 3, 0)))
+#endif
+;
+
+static void
+int_reply(int n, char *c, const char *fmt, va_list ap)
+{
+ char buf[10240];
+ char *p;
+ p=buf;
+ if(n){
+ snprintf(p, sizeof(buf), "%d%s", n, c);
+ p+=strlen(p);
+ }
+ vsnprintf(p, sizeof(buf) - strlen(p), fmt, ap);
+ p+=strlen(p);
+ snprintf(p, sizeof(buf) - strlen(p), "\r\n");
+ p+=strlen(p);
+ sec_fprintf(stdout, "%s", buf);
+ fflush(stdout);
+ if (debug)
+ syslog(LOG_DEBUG, "<--- %s- ", buf);
+}
+
+void
+reply(int n, const char *fmt, ...)
+{
+ va_list ap;
+ va_start(ap, fmt);
+ int_reply(n, " ", fmt, ap);
+ delete_ftp_command();
+ va_end(ap);
+}
+
+void
+lreply(int n, const char *fmt, ...)
+{
+ va_list ap;
+ va_start(ap, fmt);
+ int_reply(n, "-", fmt, ap);
+ va_end(ap);
+}
+
+void
+nreply(const char *fmt, ...)
+{
+ va_list ap;
+ va_start(ap, fmt);
+ int_reply(0, NULL, fmt, ap);
+ va_end(ap);
+}
+
+static void
+ack(char *s)
+{
+
+ reply(250, "%s command successful.", s);
+}
+
+void
+nack(char *s)
+{
+
+ reply(502, "%s command not implemented.", s);
+}
+
+/* ARGSUSED */
+void
+yyerror(char *s)
+{
+ char *cp;
+
+ if ((cp = strchr(cbuf,'\n')))
+ *cp = '\0';
+ reply(500, "'%s': command not understood.", cbuf);
+}
+
+void
+do_delete(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(char *path)
+{
+
+ if (chdir(path) < 0)
+ perror_reply(550, path);
+ else
+ ack("CWD");
+}
+
+void
+makedir(char *name)
+{
+
+ LOGCMD("mkdir", name);
+ if(guest && filename_check(name))
+ return;
+ if (mkdir(name, 0777) < 0)
+ perror_reply(550, name);
+ else{
+ if(guest)
+ chmod(name, 0700); /* guest has umask 777 */
+ reply(257, "MKD command successful.");
+ }
+}
+
+void
+removedir(char *name)
+{
+
+ LOGCMD("rmdir", name);
+ if (rmdir(name) < 0)
+ perror_reply(550, name);
+ else
+ ack("RMD");
+}
+
+void
+pwd(void)
+{
+ char path[MaxPathLen];
+ char *ret;
+
+ /* SunOS has a broken getcwd that does popen(pwd) (!!!), this
+ * failes miserably when running chroot
+ */
+ ret = getcwd(path, sizeof(path));
+ if (ret == NULL)
+ reply(550, "%s.", strerror(errno));
+ else
+ reply(257, "\"%s\" is current directory.", path);
+}
+
+char *
+renamefrom(char *name)
+{
+ struct stat st;
+
+ if (stat(name, &st) < 0) {
+ perror_reply(550, name);
+ return NULL;
+ }
+ reply(350, "File exists, ready for destination name");
+ return (name);
+}
+
+void
+renamecmd(char *from, char *to)
+{
+
+ LOGCMD2("rename", from, to);
+ if(guest && filename_check(to))
+ return;
+ if (rename(from, to) < 0)
+ perror_reply(550, "rename");
+ else
+ ack("RNTO");
+}
+
+static void
+dolog(struct sockaddr *sa, int len)
+{
+ getnameinfo_verified (sa, len, remotehost, sizeof(remotehost),
+ NULL, 0, 0);
+#ifdef HAVE_SETPROCTITLE
+ snprintf(proctitle, sizeof(proctitle), "%s: connected", remotehost);
+ setproctitle(proctitle);
+#endif /* HAVE_SETPROCTITLE */
+
+ if (logging) {
+ char data_addr[256];
+
+ if (inet_ntop (his_addr->sa_family,
+ socket_get_address(his_addr),
+ data_addr, sizeof(data_addr)) == NULL)
+ strlcpy (data_addr, "unknown address",
+ sizeof(data_addr));
+
+
+ syslog(LOG_INFO, "connection from %s(%s)",
+ remotehost,
+ data_addr);
+ }
+}
+
+/*
+ * Record logout in wtmp file
+ * and exit with supplied status.
+ */
+void
+dologout(int status)
+{
+ transflag = 0;
+ if (logged_in) {
+ seteuid((uid_t)0);
+ ftpd_logwtmp(ttyline, "", "");
+#ifdef KRB4
+ cond_kdestroy();
+#endif
+ }
+ /* beware of flushing buffers after a SIGPIPE */
+#ifdef XXX
+ exit(status);
+#else
+ _exit(status);
+#endif
+}
+
+void abor(void)
+{
+}
+
+static void
+myoob(int signo)
+{
+#if 0
+ char *cp;
+#endif
+
+ /* only process if transfer occurring */
+ if (!transflag)
+ return;
+
+ /* This is all XXX */
+ oobflag = 1;
+ /* if the command resulted in a new command,
+ parse that as well */
+ do{
+ yyparse();
+ } while(ftp_command);
+ oobflag = 0;
+
+#if 0
+ cp = tmpline;
+ if (ftpd_getline(cp, 7) == 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: %ld of %ld bytes transferred",
+ (long)byte_count,
+ (long)file_size);
+ else
+ reply(213, "Status: %ld bytes transferred"
+ (long)byte_count);
+ }
+#endif
+}
+
+/*
+ * 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
+pasv(void)
+{
+ int len;
+ char *p, *a;
+ struct sockaddr_in *sin;
+
+ if (ctrl_addr->sa_family != AF_INET) {
+ reply(425,
+ "You cannot do PASV with something that's not IPv4");
+ return;
+ }
+
+ pdata = socket(ctrl_addr->sa_family, SOCK_STREAM, 0);
+ if (pdata < 0) {
+ perror_reply(425, "Can't open passive connection");
+ return;
+ }
+ pasv_addr->sa_family = ctrl_addr->sa_family;
+ socket_set_address_and_port (pasv_addr,
+ socket_get_address (ctrl_addr),
+ 0);
+ seteuid(0);
+ if (bind(pdata, pasv_addr, socket_sockaddr_size (pasv_addr)) < 0) {
+ seteuid(pw->pw_uid);
+ goto pasv_error;
+ }
+ seteuid(pw->pw_uid);
+ len = sizeof(pasv_addr_ss);
+ if (getsockname(pdata, pasv_addr, &len) < 0)
+ goto pasv_error;
+ if (listen(pdata, 1) < 0)
+ goto pasv_error;
+ sin = (struct sockaddr_in *)pasv_addr;
+ a = (char *) &sin->sin_addr;
+ p = (char *) &sin->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:
+ close(pdata);
+ pdata = -1;
+ perror_reply(425, "Can't open passive connection");
+ return;
+}
+
+void
+epsv(char *proto)
+{
+ int len;
+
+ pdata = socket(ctrl_addr->sa_family, SOCK_STREAM, 0);
+ if (pdata < 0) {
+ perror_reply(425, "Can't open passive connection");
+ return;
+ }
+ pasv_addr->sa_family = ctrl_addr->sa_family;
+ socket_set_address_and_port (pasv_addr,
+ socket_get_address (ctrl_addr),
+ 0);
+ seteuid(0);
+ if (bind(pdata, pasv_addr, socket_sockaddr_size (pasv_addr)) < 0) {
+ seteuid(pw->pw_uid);
+ goto pasv_error;
+ }
+ seteuid(pw->pw_uid);
+ len = sizeof(pasv_addr_ss);
+ if (getsockname(pdata, pasv_addr, &len) < 0)
+ goto pasv_error;
+ if (listen(pdata, 1) < 0)
+ goto pasv_error;
+
+ reply(229, "Entering Extended Passive Mode (|||%d|)",
+ ntohs(socket_get_port (pasv_addr)));
+ return;
+
+pasv_error:
+ close(pdata);
+ pdata = -1;
+ perror_reply(425, "Can't open passive connection");
+ return;
+}
+
+void
+eprt(char *str)
+{
+ char *end;
+ char sep;
+ int af;
+ int ret;
+ int port;
+
+ usedefault = 0;
+ if (pdata >= 0) {
+ close(pdata);
+ pdata = -1;
+ }
+
+ sep = *str++;
+ if (sep == '\0') {
+ reply(500, "Bad syntax in EPRT");
+ return;
+ }
+ af = strtol (str, &end, 0);
+ if (af == 0 || *end != sep) {
+ reply(500, "Bad syntax in EPRT");
+ return;
+ }
+ str = end + 1;
+ switch (af) {
+#ifdef HAVE_IPV6
+ case 2 :
+ data_dest->sa_family = AF_INET6;
+ break;
+#endif
+ case 1 :
+ data_dest->sa_family = AF_INET;
+ break;
+ default :
+ reply(522, "Network protocol %d not supported, use (1"
+#ifdef HAVE_IPV6
+ ",2"
+#endif
+ ")", af);
+ return;
+ }
+ end = strchr (str, sep);
+ if (end == NULL) {
+ reply(500, "Bad syntax in EPRT");
+ return;
+ }
+ *end = '\0';
+ ret = inet_pton (data_dest->sa_family, str,
+ socket_get_address (data_dest));
+
+ if (ret != 1) {
+ reply(500, "Bad address syntax in EPRT");
+ return;
+ }
+ str = end + 1;
+ port = strtol (str, &end, 0);
+ if (port == 0 || *end != sep) {
+ reply(500, "Bad port syntax in EPRT");
+ return;
+ }
+ socket_set_port (data_dest, htons(port));
+ reply(200, "EPRT command successful.");
+}
+
+/*
+ * 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(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 NULL;
+ }
+ if (cp)
+ *cp = '/';
+ for (count = 1; count < 100; count++) {
+ snprintf (new, sizeof(new), "%s.%d", local, 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(int code, const char *string)
+{
+ reply(code, "%s: %s.", string, strerror(errno));
+}
+
+static char *onefile[] = {
+ "",
+ 0
+};
+
+void
+list_file(char *file)
+{
+ if(use_builtin_ls) {
+ FILE *dout;
+ dout = dataconn(file, -1, "w");
+ if (dout == NULL)
+ return;
+ set_buffer_size(fileno(dout), 0);
+ builtin_ls(dout, file);
+ reply(226, "Transfer complete.");
+ fclose(dout);
+ data = -1;
+ pdata = -1;
+ } else {
+#ifdef HAVE_LS_A
+ const char *cmd = "/bin/ls -lA -- %s";
+#else
+ const char *cmd = "/bin/ls -la -- %s";
+#endif
+ retrieve(cmd, file);
+ }
+}
+
+void
+send_file_list(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;
+ char buf[MaxPathLen];
+
+ 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) {
+ 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++;
+ }
+ snprintf(buf, sizeof(buf), "%s%s\n", dirname,
+ type == TYPE_A ? "\r" : "");
+ sec_write(fileno(dout), buf, strlen(buf));
+ 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 (!strcmp(dir->d_name, "."))
+ continue;
+ if (!strcmp(dir->d_name, ".."))
+ 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(strncmp(nbuf, "./", 2) == 0)
+ snprintf(buf, sizeof(buf), "%s%s\n", nbuf +2,
+ type == TYPE_A ? "\r" : "");
+ else
+ snprintf(buf, sizeof(buf), "%s%s\n", nbuf,
+ type == TYPE_A ? "\r" : "");
+ sec_write(fileno(dout), buf, strlen(buf));
+ byte_count += strlen(nbuf) + 1;
+ }
+ }
+ 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){
+ sec_write(fileno(dout), buf, 0); /* XXX flush */
+
+ fclose(dout);
+ }
+ data = -1;
+ pdata = -1;
+out:
+ if (freeglob) {
+ freeglob = 0;
+ globfree(&gl);
+ }
+}
+
+
+int
+find(char *pattern)
+{
+ char line[1024];
+ FILE *f;
+
+ snprintf(line, sizeof(line),
+ "/bin/locate -d %s -- %s",
+ ftp_rooted("/etc/locatedb"),
+ pattern);
+ f = ftpd_popen(line, "r", 1, 1);
+ if(f == NULL){
+ perror_reply(550, "/bin/locate");
+ return 1;
+ }
+ lreply(200, "Output from find.");
+ while(fgets(line, sizeof(line), f)){
+ if(line[strlen(line)-1] == '\n')
+ line[strlen(line)-1] = 0;
+ nreply("%s", line);
+ }
+ reply(200, "Done");
+ ftpd_pclose(f);
+ return 0;
+}
+
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