8b77149a4d
git-svn-id: svn://svn.h5l.se/heimdal/trunk/heimdal@5482 ec53bebd-3082-4978-b11e-865c3cabbd6b
2005 lines
43 KiB
C
2005 lines
43 KiB
C
/*
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* Copyright (c) 1985, 1988, 1990, 1992, 1993, 1994
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#define FTP_NAMES
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#include "ftpd_locl.h"
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RCSID("$Id$");
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static char version[] = "Version 6.00";
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extern off_t restart_point;
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extern char cbuf[];
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struct sockaddr_in ctrl_addr;
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struct sockaddr_in data_source;
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struct sockaddr_in data_dest;
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struct sockaddr_in his_addr;
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struct sockaddr_in pasv_addr;
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int data;
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jmp_buf errcatch, urgcatch;
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int oobflag;
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int logged_in;
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struct passwd *pw;
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int debug = 0;
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int ftpd_timeout = 900; /* timeout after 15 minutes of inactivity */
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int maxtimeout = 7200;/* don't allow idle time to be set beyond 2 hours */
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int logging;
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int guest;
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int dochroot;
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int type;
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int form;
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int stru; /* avoid C keyword */
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int mode;
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int usedefault = 1; /* for data transfers */
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int pdata = -1; /* for passive mode */
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int transflag;
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off_t file_size;
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off_t byte_count;
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#if !defined(CMASK) || CMASK == 0
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#undef CMASK
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#define CMASK 027
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#endif
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int defumask = CMASK; /* default umask value */
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int guest_umask = 0777; /* Paranoia for anonymous users */
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char tmpline[10240];
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char hostname[MaxHostNameLen];
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char remotehost[MaxHostNameLen];
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static char ttyline[20];
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#define AUTH_PLAIN (1 << 0) /* allow sending passwords */
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#define AUTH_OTP (1 << 1) /* passwords are one-time */
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#define AUTH_FTP (1 << 2) /* allow anonymous login */
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static int auth_level = 0; /* Only allow kerberos login by default */
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/*
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* Timeout intervals for retrying connections
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* to hosts that don't accept PORT cmds. This
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* is a kludge, but given the problems with TCP...
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*/
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#define SWAITMAX 90 /* wait at most 90 seconds */
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#define SWAITINT 5 /* interval between retries */
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int swaitmax = SWAITMAX;
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int swaitint = SWAITINT;
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#ifdef HAVE_SETPROCTITLE
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char proctitle[BUFSIZ]; /* initial part of title */
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#endif /* HAVE_SETPROCTITLE */
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#define LOGCMD(cmd, file) \
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if (logging > 1) \
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syslog(LOG_INFO,"%s %s%s", cmd, \
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*(file) == '/' ? "" : curdir(), file);
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#define LOGCMD2(cmd, file1, file2) \
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if (logging > 1) \
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syslog(LOG_INFO,"%s %s%s %s%s", cmd, \
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*(file1) == '/' ? "" : curdir(), file1, \
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*(file2) == '/' ? "" : curdir(), file2);
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#define LOGBYTES(cmd, file, cnt) \
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if (logging > 1) { \
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if (cnt == (off_t)-1) \
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syslog(LOG_INFO,"%s %s%s", cmd, \
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*(file) == '/' ? "" : curdir(), file); \
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else \
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syslog(LOG_INFO, "%s %s%s = %ld bytes", \
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cmd, (*(file) == '/') ? "" : curdir(), file, (long)cnt); \
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}
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static void ack (char *);
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static void myoob (int);
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static int checkuser (char *, char *);
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static int checkaccess (char *);
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static FILE *dataconn (char *, off_t, char *);
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static void dolog (struct sockaddr_in *);
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static void end_login (void);
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static FILE *getdatasock (char *);
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static char *gunique (char *);
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static RETSIGTYPE lostconn (int);
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static int receive_data (FILE *, FILE *);
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static void send_data (FILE *, FILE *);
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static struct passwd * sgetpwnam (char *);
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static void usage(void);
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static char *
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curdir(void)
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{
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static char path[MaxPathLen+1]; /* path + '/' + '\0' */
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if (getcwd(path, sizeof(path)-1) == NULL)
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return ("");
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if (path[1] != '\0') /* special case for root dir. */
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strcat_truncate(path, "/", sizeof(path));
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/* For guest account, skip / since it's chrooted */
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return (guest ? path+1 : path);
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}
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#ifndef LINE_MAX
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#define LINE_MAX 1024
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#endif
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static int
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parse_auth_level(char *str)
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{
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char *p;
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int ret = 0;
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char *foo = NULL;
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for(p = strtok_r(str, ",", &foo);
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p;
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p = strtok_r(NULL, ",", &foo)) {
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if(strcmp(p, "user") == 0)
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;
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#ifdef OTP
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else if(strcmp(p, "otp") == 0)
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ret |= AUTH_PLAIN|AUTH_OTP;
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#endif
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else if(strcmp(p, "ftp") == 0 ||
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strcmp(p, "safe") == 0)
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ret |= AUTH_FTP;
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else if(strcmp(p, "plain") == 0)
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ret |= AUTH_PLAIN;
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else if(strcmp(p, "none") == 0)
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ret |= AUTH_PLAIN|AUTH_FTP;
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else
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warnx("bad value for -a: `%s'", p);
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}
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return ret;
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}
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/*
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* Print usage and die.
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*/
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static void
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usage (void)
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{
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fprintf (stderr,
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"Usage: %s [-d] [-i] [-g guest_umask] [-l] [-p port]"
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" [-t timeout] [-T max_timeout] [-u umask] [-v]"
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" [-a auth_level] \n",
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__progname);
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exit (1);
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}
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int
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main(int argc, char **argv)
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{
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int addrlen, ch, on = 1, tos;
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char *cp, line[LINE_MAX];
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FILE *fd;
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int not_inetd = 0;
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int port;
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struct servent *sp;
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set_progname (argv[0]);
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#ifdef KRB4
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/* detach from any tickets and tokens */
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{
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char tkfile[1024];
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snprintf(tkfile, sizeof(tkfile),
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"/tmp/ftp_%u", (unsigned)getpid());
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krb_set_tkt_string(tkfile);
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if(k_hasafs())
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k_setpag();
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}
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#endif
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sp = getservbyname("ftp", "tcp");
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if(sp)
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port = sp->s_port;
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else
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port = htons(21);
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while ((ch = getopt(argc, argv, "a:dg:ilp:t:T:u:v")) != EOF) {
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switch (ch) {
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case 'a':
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auth_level = parse_auth_level(optarg);
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break;
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case 'd':
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debug = 1;
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break;
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case 'i':
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not_inetd = 1;
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break;
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case 'g':
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{
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long val = 0;
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val = strtol(optarg, &optarg, 8);
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if (*optarg != '\0' || val < 0)
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warnx("bad value for -g");
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else
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guest_umask = val;
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break;
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}
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case 'l':
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logging++; /* > 1 == extra logging */
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break;
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case 'p':
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sp = getservbyname(optarg, "tcp");
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if(sp)
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port = sp->s_port;
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else
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if(isdigit(optarg[0]))
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port = htons(atoi(optarg));
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else
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warnx("bad value for -p");
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break;
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case 't':
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ftpd_timeout = atoi(optarg);
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if (maxtimeout < ftpd_timeout)
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maxtimeout = ftpd_timeout;
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break;
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case 'T':
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maxtimeout = atoi(optarg);
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if (ftpd_timeout > maxtimeout)
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ftpd_timeout = maxtimeout;
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break;
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case 'u':
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{
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long val = 0;
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val = strtol(optarg, &optarg, 8);
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if (*optarg != '\0' || val < 0)
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warnx("bad value for -u");
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else
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defumask = val;
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break;
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}
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case 'v':
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debug = 1;
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break;
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default:
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usage ();
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}
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}
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if(not_inetd)
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mini_inetd (port);
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/*
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* LOG_NDELAY sets up the logging connection immediately,
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* necessary for anonymous ftp's that chroot and can't do it later.
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*/
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openlog("ftpd", LOG_PID | LOG_NDELAY, LOG_FTP);
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addrlen = sizeof(his_addr);
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if (getpeername(0, (struct sockaddr *)&his_addr, &addrlen) < 0) {
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syslog(LOG_ERR, "getpeername (%s): %m",argv[0]);
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exit(1);
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}
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addrlen = sizeof(ctrl_addr);
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if (getsockname(0, (struct sockaddr *)&ctrl_addr, &addrlen) < 0) {
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syslog(LOG_ERR, "getsockname (%s): %m",argv[0]);
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exit(1);
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}
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#if defined(IP_TOS) && defined(HAVE_SETSOCKOPT)
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tos = IPTOS_LOWDELAY;
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if (setsockopt(0, IPPROTO_IP, IP_TOS, (void *)&tos, sizeof(int)) < 0)
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syslog(LOG_WARNING, "setsockopt (IP_TOS): %m");
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#endif
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data_source.sin_port = htons(ntohs(ctrl_addr.sin_port) - 1);
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/* set this here so it can be put in wtmp */
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snprintf(ttyline, sizeof(ttyline), "ftp%u", (unsigned)getpid());
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/* freopen(_PATH_DEVNULL, "w", stderr); */
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signal(SIGPIPE, lostconn);
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signal(SIGCHLD, SIG_IGN);
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#ifdef SIGURG
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if (signal(SIGURG, myoob) == SIG_ERR)
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syslog(LOG_ERR, "signal: %m");
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#endif
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/* Try to handle urgent data inline */
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#if defined(SO_OOBINLINE) && defined(HAVE_SETSOCKOPT)
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if (setsockopt(0, SOL_SOCKET, SO_OOBINLINE, (void *)&on,
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sizeof(on)) < 0)
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syslog(LOG_ERR, "setsockopt: %m");
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#endif
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#ifdef F_SETOWN
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if (fcntl(fileno(stdin), F_SETOWN, getpid()) == -1)
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syslog(LOG_ERR, "fcntl F_SETOWN: %m");
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#endif
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dolog(&his_addr);
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/*
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* Set up default state
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*/
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data = -1;
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type = TYPE_A;
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form = FORM_N;
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stru = STRU_F;
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mode = MODE_S;
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tmpline[0] = '\0';
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/* If logins are disabled, print out the message. */
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if ((fd = fopen(_PATH_NOLOGIN,"r")) != NULL) {
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while (fgets(line, sizeof(line), fd) != NULL) {
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if ((cp = strchr(line, '\n')) != NULL)
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*cp = '\0';
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lreply(530, "%s", line);
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}
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fflush(stdout);
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fclose(fd);
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reply(530, "System not available.");
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exit(0);
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}
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if ((fd = fopen(_PATH_FTPWELCOME, "r")) != NULL) {
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while (fgets(line, sizeof(line), fd) != NULL) {
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if ((cp = strchr(line, '\n')) != NULL)
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*cp = '\0';
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lreply(220, "%s", line);
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}
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fflush(stdout);
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fclose(fd);
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/* reply(220,) must follow */
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}
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gethostname(hostname, sizeof(hostname));
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reply(220, "%s FTP server (%s"
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#ifdef KRB5
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"+%s"
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#endif
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#ifdef KRB4
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"+%s"
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#endif
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") ready.", hostname, version
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#ifdef KRB5
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,heimdal_version
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#endif
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#ifdef KRB4
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,krb4_version
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#endif
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);
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setjmp(errcatch);
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for (;;)
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yyparse();
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/* NOTREACHED */
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}
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static RETSIGTYPE
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lostconn(int signo)
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{
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if (debug)
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syslog(LOG_DEBUG, "lost connection");
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dologout(-1);
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}
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/*
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* Helper function for sgetpwnam().
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*/
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static char *
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sgetsave(char *s)
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{
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char *new = strdup(s);
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if (new == NULL) {
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perror_reply(421, "Local resource failure: malloc");
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dologout(1);
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/* NOTREACHED */
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}
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return new;
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}
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/*
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* Save the result of a getpwnam. Used for USER command, since
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* the data returned must not be clobbered by any other command
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* (e.g., globbing).
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*/
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static struct passwd *
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sgetpwnam(char *name)
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{
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static struct passwd save;
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struct passwd *p;
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if ((p = k_getpwnam(name)) == NULL)
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return (p);
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if (save.pw_name) {
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free(save.pw_name);
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free(save.pw_passwd);
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free(save.pw_gecos);
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free(save.pw_dir);
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free(save.pw_shell);
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}
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save = *p;
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save.pw_name = sgetsave(p->pw_name);
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save.pw_passwd = sgetsave(p->pw_passwd);
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save.pw_gecos = sgetsave(p->pw_gecos);
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save.pw_dir = sgetsave(p->pw_dir);
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save.pw_shell = sgetsave(p->pw_shell);
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return (&save);
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}
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static int login_attempts; /* number of failed login attempts */
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static int askpasswd; /* had user command, ask for passwd */
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static char curname[10]; /* current USER name */
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#ifdef OTP
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OtpContext otp_ctx;
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#endif
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/*
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* USER command.
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* Sets global passwd pointer pw if named account exists and is acceptable;
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* sets askpasswd if a PASS command is expected. If logged in previously,
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* need to reset state. If name is "ftp" or "anonymous", the name is not in
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* _PATH_FTPUSERS, and ftp account exists, set guest and pw, then just return.
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* If account doesn't exist, ask for passwd anyway. Otherwise, check user
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* requesting login privileges. Disallow anyone who does not have a standard
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* shell as returned by getusershell(). Disallow anyone mentioned in the file
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* _PATH_FTPUSERS to allow people such as root and uucp to be avoided.
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*/
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void
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user(char *name)
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{
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char *cp, *shell;
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if(auth_level == 0 && !sec_complete){
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reply(530, "No login allowed without authorization.");
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return;
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}
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if (logged_in) {
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if (guest) {
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reply(530, "Can't change user from guest login.");
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return;
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} else if (dochroot) {
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reply(530, "Can't change user from chroot user.");
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return;
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}
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end_login();
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}
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guest = 0;
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if (strcmp(name, "ftp") == 0 || strcmp(name, "anonymous") == 0) {
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if ((auth_level & AUTH_FTP) == 0 ||
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checkaccess("ftp") ||
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checkaccess("anonymous"))
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reply(530, "User %s access denied.", name);
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else if ((pw = sgetpwnam("ftp")) != NULL) {
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guest = 1;
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defumask = guest_umask; /* paranoia for incoming */
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askpasswd = 1;
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reply(331, "Guest login ok, type your name as password.");
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} else
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reply(530, "User %s unknown.", name);
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if (!askpasswd && logging)
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syslog(LOG_NOTICE,
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"ANONYMOUS FTP LOGIN REFUSED FROM %s(%s)",
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remotehost, inet_ntoa(his_addr.sin_addr));
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return;
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}
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if((auth_level & AUTH_PLAIN) == 0 && !sec_complete){
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reply(530, "Only authorized and anonymous login allowed.");
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return;
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}
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if ((pw = sgetpwnam(name))) {
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if ((shell = pw->pw_shell) == NULL || *shell == 0)
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shell = _PATH_BSHELL;
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while ((cp = getusershell()) != NULL)
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if (strcmp(cp, shell) == 0)
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break;
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|
endusershell();
|
|
|
|
if (cp == NULL || checkaccess(name)) {
|
|
reply(530, "User %s access denied.", name);
|
|
if (logging)
|
|
syslog(LOG_NOTICE,
|
|
"FTP LOGIN REFUSED FROM %s(%s), %s",
|
|
remotehost,
|
|
inet_ntoa(his_addr.sin_addr),
|
|
name);
|
|
pw = (struct passwd *) NULL;
|
|
return;
|
|
}
|
|
}
|
|
if (logging)
|
|
strcpy_truncate(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;
|
|
}
|
|
/*
|
|
* Display a login message, if it exists.
|
|
* N.B. reply(code,) must follow the message.
|
|
*/
|
|
if ((fd = fopen(_PATH_FTPLOGINMESG, "r")) != NULL) {
|
|
char *cp, line[LINE_MAX];
|
|
|
|
while (fgets(line, sizeof(line), fd) != NULL) {
|
|
if ((cp = strchr(line, '\n')) != NULL)
|
|
*cp = '\0';
|
|
lreply(code, "%s", line);
|
|
}
|
|
}
|
|
if (guest) {
|
|
reply(code, "Guest login ok, access restrictions apply.");
|
|
#ifdef HAVE_SETPROCTITLE
|
|
snprintf (proctitle, sizeof(proctitle),
|
|
"%s: anonymous/%s",
|
|
remotehost,
|
|
passwd);
|
|
#endif /* HAVE_SETPROCTITLE */
|
|
if (logging)
|
|
syslog(LOG_INFO, "ANONYMOUS FTP LOGIN FROM %s(%s), %s",
|
|
remotehost,
|
|
inet_ntoa(his_addr.sin_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)
|
|
syslog(LOG_INFO, "FTP LOGIN FROM %s(%s) as %s",
|
|
remotehost,
|
|
inet_ntoa(his_addr.sin_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, 1, 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) {
|
|
reply(530, "Login incorrect.");
|
|
if (logging)
|
|
syslog(LOG_NOTICE,
|
|
"FTP LOGIN FAILED FROM %s(%s), %s",
|
|
remotehost,
|
|
inet_ntoa(his_addr.sin_addr),
|
|
curname);
|
|
pw = NULL;
|
|
if (login_attempts++ >= 5) {
|
|
syslog(LOG_NOTICE,
|
|
"repeated login failures from %s(%s)",
|
|
remotehost,
|
|
inet_ntoa(his_addr.sin_addr));
|
|
exit(0);
|
|
}
|
|
return;
|
|
}
|
|
}
|
|
if(!do_login(230, passwd))
|
|
return;
|
|
|
|
/* Forget all about it... */
|
|
end_login();
|
|
}
|
|
|
|
void
|
|
retrieve(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){
|
|
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 -d %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 {
|
|
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(char *mode)
|
|
{
|
|
int on = 1, s, t, tries;
|
|
|
|
if (data >= 0)
|
|
return (fdopen(data, mode));
|
|
seteuid((uid_t)0);
|
|
s = socket(AF_INET, SOCK_STREAM, 0);
|
|
if (s < 0)
|
|
goto bad;
|
|
#if defined(SO_REUSEADDR) && defined(HAVE_SETSOCKOPT)
|
|
if (setsockopt(s, SOL_SOCKET, SO_REUSEADDR,
|
|
(void *) &on, sizeof(on)) < 0)
|
|
goto bad;
|
|
#endif
|
|
/* anchor socket to avoid multi-homing problems */
|
|
data_source.sin_family = AF_INET;
|
|
data_source.sin_addr = ctrl_addr.sin_addr;
|
|
for (tries = 1; ; tries++) {
|
|
if (bind(s, (struct sockaddr *)&data_source,
|
|
sizeof(data_source)) >= 0)
|
|
break;
|
|
if (errno != EADDRINUSE || tries > 10)
|
|
goto bad;
|
|
sleep(tries);
|
|
}
|
|
seteuid((uid_t)pw->pw_uid);
|
|
#if defined(IP_TOS) && defined(HAVE_SETSOCKOPT)
|
|
on = IPTOS_THROUGHPUT;
|
|
if (setsockopt(s, IPPROTO_IP, IP_TOS, (void *)&on, sizeof(int)) < 0)
|
|
syslog(LOG_WARNING, "setsockopt (IP_TOS): %m");
|
|
#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(char *name, off_t size, 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_in from;
|
|
int s, fromlen = sizeof(from);
|
|
|
|
s = accept(pdata, (struct sockaddr *)&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) {
|
|
reply(425, "Can't create data socket (%s,%d): %s.",
|
|
inet_ntoa(data_source.sin_addr),
|
|
ntohs(data_source.sin_port), strerror(errno));
|
|
return (NULL);
|
|
}
|
|
data = fileno(file);
|
|
while (connect(data, (struct sockaddr *)&data_dest,
|
|
sizeof(data_dest)) < 0) {
|
|
if (errno == EADDRINUSE && retry < swaitmax) {
|
|
sleep((unsigned) swaitint);
|
|
retry += swaitint;
|
|
continue;
|
|
}
|
|
perror_reply(425, "Can't build data connection");
|
|
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)) {
|
|
chunk = mmap(0, st.st_size, PROT_READ, MAP_SHARED, in, 0);
|
|
if(chunk != (void *)MAP_FAILED) {
|
|
cnt = st.st_size - restart_point;
|
|
sec_write(fileno(outstr),
|
|
chunk + restart_point,
|
|
cnt);
|
|
munmap(chunk, st.st_size);
|
|
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 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_in *sin)
|
|
{
|
|
inaddr2str (sin->sin_addr, remotehost, sizeof(remotehost));
|
|
#ifdef HAVE_SETPROCTITLE
|
|
snprintf(proctitle, sizeof(proctitle), "%s: connected", remotehost);
|
|
setproctitle(proctitle);
|
|
#endif /* HAVE_SETPROCTITLE */
|
|
|
|
if (logging)
|
|
syslog(LOG_INFO, "connection from %s(%s)",
|
|
remotehost,
|
|
inet_ntoa(his_addr.sin_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 (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
|
|
passive(void)
|
|
{
|
|
int len;
|
|
char *p, *a;
|
|
|
|
pdata = socket(AF_INET, SOCK_STREAM, 0);
|
|
if (pdata < 0) {
|
|
perror_reply(425, "Can't open passive connection");
|
|
return;
|
|
}
|
|
pasv_addr = ctrl_addr;
|
|
pasv_addr.sin_port = 0;
|
|
seteuid((uid_t)0);
|
|
if (bind(pdata, (struct sockaddr *)&pasv_addr, sizeof(pasv_addr)) < 0) {
|
|
seteuid((uid_t)pw->pw_uid);
|
|
goto pasv_error;
|
|
}
|
|
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;
|
|
a = (char *) &pasv_addr.sin_addr;
|
|
p = (char *) &pasv_addr.sin_port;
|
|
|
|
#define UC(b) (((int) b) & 0xff)
|
|
|
|
reply(227, "Entering Passive Mode (%d,%d,%d,%d,%d,%d)", UC(a[0]),
|
|
UC(a[1]), UC(a[2]), UC(a[3]), UC(p[0]), UC(p[1]));
|
|
return;
|
|
|
|
pasv_error:
|
|
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(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, char *string)
|
|
{
|
|
reply(code, "%s: %s.", string, strerror(errno));
|
|
}
|
|
|
|
static char *onefile[] = {
|
|
"",
|
|
0
|
|
};
|
|
|
|
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;
|
|
}
|
|
|