3283 lines
74 KiB
C
3283 lines
74 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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#if 0
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#ifndef lint
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static char copyright[] =
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"@(#) Copyright (c) 1985, 1988, 1990, 1992, 1993, 1994\n\
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The Regents of the University of California. All rights reserved.\n";
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#endif /* not lint */
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#endif
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#ifndef lint
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#if 0
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static char sccsid[] = "@(#)ftpd.c 8.4 (Berkeley) 4/16/94";
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#endif
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static const char rcsid[] =
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"$FreeBSD$";
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#endif /* not lint */
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/*
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* FTP server.
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*/
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#include <sys/param.h>
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#include <sys/ioctl.h>
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#include <sys/mman.h>
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#include <sys/socket.h>
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#include <sys/stat.h>
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#include <sys/time.h>
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#include <sys/wait.h>
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#include <netinet/in.h>
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#include <netinet/in_systm.h>
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#include <netinet/ip.h>
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#include <netinet/tcp.h>
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#define FTP_NAMES
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#include <arpa/ftp.h>
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#include <arpa/inet.h>
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#include <arpa/telnet.h>
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#include <ctype.h>
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#include <dirent.h>
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#include <err.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <glob.h>
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#include <limits.h>
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#include <netdb.h>
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#include <pwd.h>
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#include <grp.h>
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#include <opie.h>
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#include <signal.h>
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#include <stdint.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <syslog.h>
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#include <time.h>
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#include <unistd.h>
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#include <libutil.h>
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#ifdef LOGIN_CAP
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#include <login_cap.h>
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#endif
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#ifdef USE_PAM
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#include <security/pam_appl.h>
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#endif
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#include "pathnames.h"
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#include "extern.h"
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#include <stdarg.h>
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static char version[] = "Version 6.00LS";
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#undef main
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extern off_t restart_point;
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extern char cbuf[];
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union sockunion ctrl_addr;
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union sockunion data_source;
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union sockunion data_dest;
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union sockunion his_addr;
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union sockunion pasv_addr;
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int daemon_mode;
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int data;
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int dataport;
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int hostinfo = 1; /* print host-specific info in messages */
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int logged_in;
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struct passwd *pw;
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char *homedir;
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int ftpdebug;
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int 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 restricted_data_ports = 1;
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int paranoid = 1; /* be extra careful about security */
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int anon_only = 0; /* Only anonymous ftp allowed */
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int guest;
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int dochroot;
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int dowtmp = 1;
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int stats;
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int statfd = -1;
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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 readonly=0; /* Server is in readonly mode. */
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int noepsv=0; /* EPSV command is disabled. */
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int noretr=0; /* RETR command is disabled. */
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int noguestretr=0; /* RETR command is disabled for anon users. */
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int noguestmkd=0; /* MKD command is disabled for anon users. */
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int noguestmod=1; /* anon users may not modify existing files. */
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static volatile sig_atomic_t recvurg;
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sig_atomic_t 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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char tmpline[7];
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char *hostname;
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int epsvall = 0;
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#ifdef VIRTUAL_HOSTING
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char *ftpuser;
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static struct ftphost {
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struct ftphost *next;
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struct addrinfo *hostinfo;
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char *hostname;
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char *anonuser;
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char *statfile;
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char *welcome;
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char *loginmsg;
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} *thishost, *firsthost;
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#endif
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char remotehost[MAXHOSTNAMELEN];
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char *ident = NULL;
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static char ttyline[20];
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char *tty = ttyline; /* for klogin */
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#ifdef USE_PAM
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static int auth_pam(struct passwd**, const char*);
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pam_handle_t *pamh = NULL;
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#endif
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static struct opie opiedata;
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static char opieprompt[OPIE_CHALLENGE_MAX+1];
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static int pwok;
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char *pid_file = NULL;
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/*
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* Limit number of pathnames that glob can return.
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* A limit of 0 indicates the number of pathnames is unlimited.
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*/
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#define MAXGLOBARGS 16384
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#
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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 SETPROCTITLE
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#ifdef OLD_SETPROCTITLE
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char **Argv = NULL; /* pointer to argument vector */
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char *LastArgv = NULL; /* end of argv */
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#endif /* OLD_SETPROCTITLE */
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char proctitle[LINE_MAX]; /* initial part of title */
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#endif /* 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 == -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 = %jd bytes", \
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cmd, (*(file) == '/') ? "" : curdir(), file, \
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(intmax_t)cnt); \
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}
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#ifdef VIRTUAL_HOSTING
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static void inithosts(void);
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static void selecthost(union sockunion *);
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#endif
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static void ack(char *);
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static void sigurg(int);
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static void myoob(void);
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static int checkuser(char *, char *, int, char **);
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static FILE *dataconn(char *, off_t, char *);
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static void dolog(struct sockaddr *);
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static char *curdir(void);
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static void end_login(void);
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static FILE *getdatasock(char *);
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static int guniquefd(char *, char **);
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static void lostconn(int);
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static void sigquit(int);
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static int receive_data(FILE *, FILE *);
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static int send_data(FILE *, FILE *, size_t, off_t, int);
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static struct passwd *
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sgetpwnam(char *);
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static char *sgetsave(char *);
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static void reapchild(int);
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static void logxfer(char *, off_t, time_t);
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static char *doublequote(char *);
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static int *socksetup(int, char *, const char *);
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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+1]; /* path + '/' + '\0' */
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if (getcwd(path, sizeof(path)-2) == NULL)
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return ("");
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if (path[1] != '\0') /* special case for root dir. */
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strcat(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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int
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main(int argc, char *argv[], char **envp)
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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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char *bindname = NULL;
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const char *bindport = "ftp";
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int family = AF_UNSPEC;
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struct sigaction sa;
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tzset(); /* in case no timezone database in ~ftp */
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sigemptyset(&sa.sa_mask);
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sa.sa_flags = SA_RESTART;
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#ifdef OLD_SETPROCTITLE
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/*
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* Save start and extent of argv for setproctitle.
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*/
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Argv = argv;
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while (*envp)
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envp++;
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LastArgv = envp[-1] + strlen(envp[-1]);
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#endif /* OLD_SETPROCTITLE */
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while ((ch = getopt(argc, argv,
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"46a:AdDEhlmMoOp:P:rRSt:T:u:UvW")) != -1) {
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switch (ch) {
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case '4':
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family = (family == AF_INET6) ? AF_UNSPEC : AF_INET;
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break;
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case '6':
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family = (family == AF_INET) ? AF_UNSPEC : AF_INET6;
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break;
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case 'a':
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bindname = optarg;
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break;
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case 'A':
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anon_only = 1;
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break;
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case 'd':
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ftpdebug++;
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break;
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case 'D':
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daemon_mode++;
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break;
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case 'E':
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noepsv = 1;
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break;
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case 'h':
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hostinfo = 0;
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break;
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case 'l':
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logging++; /* > 1 == extra logging */
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break;
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case 'm':
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noguestmod = 0;
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break;
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case 'M':
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noguestmkd = 1;
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break;
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case 'o':
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noretr = 1;
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break;
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case 'O':
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noguestretr = 1;
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break;
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case 'p':
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pid_file = optarg;
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break;
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case 'P':
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bindport = optarg;
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break;
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case 'r':
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readonly = 1;
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break;
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case 'R':
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paranoid = 0;
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break;
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case 'S':
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stats++;
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break;
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case 't':
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timeout = atoi(optarg);
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if (maxtimeout < timeout)
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maxtimeout = timeout;
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break;
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case 'T':
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maxtimeout = atoi(optarg);
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if (timeout > maxtimeout)
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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 'U':
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restricted_data_ports = 0;
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break;
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case 'v':
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ftpdebug++;
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break;
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case 'W':
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dowtmp = 0;
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break;
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default:
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warnx("unknown flag -%c ignored", optopt);
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break;
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}
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}
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#ifdef VIRTUAL_HOSTING
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inithosts();
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#endif
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(void) freopen(_PATH_DEVNULL, "w", stderr);
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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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if (daemon_mode) {
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int *ctl_sock, fd, maxfd = -1, nfds, i;
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fd_set defreadfds, readfds;
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pid_t pid;
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/*
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* Detach from parent.
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*/
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if (daemon(1, 1) < 0) {
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syslog(LOG_ERR, "failed to become a daemon");
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exit(1);
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}
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sa.sa_handler = reapchild;
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(void)sigaction(SIGCHLD, &sa, NULL);
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/*
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* Open a socket, bind it to the FTP port, and start
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* listening.
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*/
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ctl_sock = socksetup(family, bindname, bindport);
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if (ctl_sock == NULL)
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exit(1);
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FD_ZERO(&defreadfds);
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for (i = 1; i <= *ctl_sock; i++) {
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FD_SET(ctl_sock[i], &defreadfds);
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if (listen(ctl_sock[i], 32) < 0) {
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syslog(LOG_ERR, "control listen: %m");
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exit(1);
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}
|
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if (maxfd < ctl_sock[i])
|
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maxfd = ctl_sock[i];
|
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}
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|
|
/*
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* Atomically write process ID
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*/
|
|
if (pid_file)
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{
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int fd;
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char buf[20];
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fd = open(pid_file, O_CREAT | O_WRONLY | O_TRUNC
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| O_NONBLOCK | O_EXLOCK, 0644);
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|
if (fd < 0) {
|
|
if (errno == EAGAIN)
|
|
errx(1, "%s: file locked", pid_file);
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else
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err(1, "%s", pid_file);
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}
|
|
snprintf(buf, sizeof(buf),
|
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"%lu\n", (unsigned long) getpid());
|
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if (write(fd, buf, strlen(buf)) < 0)
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err(1, "%s: write", pid_file);
|
|
/* Leave the pid file open and locked */
|
|
}
|
|
/*
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|
* Loop forever accepting connection requests and forking off
|
|
* children to handle them.
|
|
*/
|
|
while (1) {
|
|
FD_COPY(&defreadfds, &readfds);
|
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nfds = select(maxfd + 1, &readfds, NULL, NULL, 0);
|
|
if (nfds <= 0) {
|
|
if (nfds < 0 && errno != EINTR)
|
|
syslog(LOG_WARNING, "select: %m");
|
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continue;
|
|
}
|
|
|
|
pid = -1;
|
|
for (i = 1; i <= *ctl_sock; i++)
|
|
if (FD_ISSET(ctl_sock[i], &readfds)) {
|
|
addrlen = sizeof(his_addr);
|
|
fd = accept(ctl_sock[i],
|
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(struct sockaddr *)&his_addr,
|
|
&addrlen);
|
|
if (fd >= 0) {
|
|
if ((pid = fork()) == 0) {
|
|
/* child */
|
|
(void) dup2(fd, 0);
|
|
(void) dup2(fd, 1);
|
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close(ctl_sock[i]);
|
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} else
|
|
close(fd);
|
|
}
|
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}
|
|
if (pid == 0)
|
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break;
|
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}
|
|
} else {
|
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addrlen = sizeof(his_addr);
|
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if (getpeername(0, (struct sockaddr *)&his_addr, &addrlen) < 0) {
|
|
syslog(LOG_ERR, "getpeername (%s): %m",argv[0]);
|
|
exit(1);
|
|
}
|
|
}
|
|
|
|
sa.sa_handler = SIG_DFL;
|
|
(void)sigaction(SIGCHLD, &sa, NULL);
|
|
|
|
sa.sa_handler = sigurg;
|
|
sa.sa_flags = 0; /* don't restart syscalls for SIGURG */
|
|
(void)sigaction(SIGURG, &sa, NULL);
|
|
|
|
sigfillset(&sa.sa_mask); /* block all signals in handler */
|
|
sa.sa_flags = SA_RESTART;
|
|
sa.sa_handler = sigquit;
|
|
(void)sigaction(SIGHUP, &sa, NULL);
|
|
(void)sigaction(SIGINT, &sa, NULL);
|
|
(void)sigaction(SIGQUIT, &sa, NULL);
|
|
(void)sigaction(SIGTERM, &sa, NULL);
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|
|
|
sa.sa_handler = lostconn;
|
|
(void)sigaction(SIGPIPE, &sa, NULL);
|
|
|
|
addrlen = sizeof(ctrl_addr);
|
|
if (getsockname(0, (struct sockaddr *)&ctrl_addr, &addrlen) < 0) {
|
|
syslog(LOG_ERR, "getsockname (%s): %m",argv[0]);
|
|
exit(1);
|
|
}
|
|
dataport = ntohs(ctrl_addr.su_port) - 1; /* as per RFC 959 */
|
|
#ifdef VIRTUAL_HOSTING
|
|
/* select our identity from virtual host table */
|
|
selecthost(&ctrl_addr);
|
|
#endif
|
|
#ifdef IP_TOS
|
|
if (ctrl_addr.su_family == AF_INET)
|
|
{
|
|
tos = IPTOS_LOWDELAY;
|
|
if (setsockopt(0, IPPROTO_IP, IP_TOS, &tos, sizeof(int)) < 0)
|
|
syslog(LOG_WARNING, "control setsockopt (IP_TOS): %m");
|
|
}
|
|
#endif
|
|
/*
|
|
* Disable Nagle on the control channel so that we don't have to wait
|
|
* for peer's ACK before issuing our next reply.
|
|
*/
|
|
if (setsockopt(0, IPPROTO_TCP, TCP_NODELAY, &on, sizeof(on)) < 0)
|
|
syslog(LOG_WARNING, "control setsockopt (TCP_NODELAY): %m");
|
|
|
|
data_source.su_port = htons(ntohs(ctrl_addr.su_port) - 1);
|
|
|
|
/* set this here so klogin can use it... */
|
|
(void)snprintf(ttyline, sizeof(ttyline), "ftp%d", getpid());
|
|
|
|
/* Try to handle urgent data inline */
|
|
#ifdef SO_OOBINLINE
|
|
if (setsockopt(0, SOL_SOCKET, SO_OOBINLINE, &on, sizeof(on)) < 0)
|
|
syslog(LOG_WARNING, "control setsockopt (SO_OOBINLINE): %m");
|
|
#endif
|
|
|
|
#ifdef F_SETOWN
|
|
if (fcntl(fileno(stdin), F_SETOWN, getpid()) == -1)
|
|
syslog(LOG_ERR, "fcntl F_SETOWN: %m");
|
|
#endif
|
|
dolog((struct sockaddr *)&his_addr);
|
|
/*
|
|
* Set up default state
|
|
*/
|
|
data = -1;
|
|
type = TYPE_A;
|
|
form = FORM_N;
|
|
stru = STRU_F;
|
|
mode = MODE_S;
|
|
tmpline[0] = '\0';
|
|
|
|
/* If logins are disabled, print out the message. */
|
|
if ((fd = fopen(_PATH_NOLOGIN,"r")) != NULL) {
|
|
while (fgets(line, sizeof(line), fd) != NULL) {
|
|
if ((cp = strchr(line, '\n')) != NULL)
|
|
*cp = '\0';
|
|
lreply(530, "%s", line);
|
|
}
|
|
(void) fflush(stdout);
|
|
(void) fclose(fd);
|
|
reply(530, "System not available.");
|
|
exit(0);
|
|
}
|
|
#ifdef VIRTUAL_HOSTING
|
|
fd = fopen(thishost->welcome, "r");
|
|
#else
|
|
fd = fopen(_PATH_FTPWELCOME, "r");
|
|
#endif
|
|
if (fd != NULL) {
|
|
while (fgets(line, sizeof(line), fd) != NULL) {
|
|
if ((cp = strchr(line, '\n')) != NULL)
|
|
*cp = '\0';
|
|
lreply(220, "%s", line);
|
|
}
|
|
(void) fflush(stdout);
|
|
(void) fclose(fd);
|
|
/* reply(220,) must follow */
|
|
}
|
|
#ifndef VIRTUAL_HOSTING
|
|
if ((hostname = malloc(MAXHOSTNAMELEN)) == NULL)
|
|
fatalerror("Ran out of memory.");
|
|
(void) gethostname(hostname, MAXHOSTNAMELEN - 1);
|
|
hostname[MAXHOSTNAMELEN - 1] = '\0';
|
|
#endif
|
|
if (hostinfo)
|
|
reply(220, "%s FTP server (%s) ready.", hostname, version);
|
|
else
|
|
reply(220, "FTP server ready.");
|
|
for (;;)
|
|
(void) yyparse();
|
|
/* NOTREACHED */
|
|
}
|
|
|
|
static void
|
|
lostconn(int signo)
|
|
{
|
|
|
|
if (ftpdebug)
|
|
syslog(LOG_DEBUG, "lost connection");
|
|
dologout(1);
|
|
}
|
|
|
|
static void
|
|
sigquit(int signo)
|
|
{
|
|
|
|
syslog(LOG_ERR, "got signal %d", signo);
|
|
dologout(1);
|
|
}
|
|
|
|
#ifdef VIRTUAL_HOSTING
|
|
/*
|
|
* read in virtual host tables (if they exist)
|
|
*/
|
|
|
|
static void
|
|
inithosts(void)
|
|
{
|
|
int insert;
|
|
size_t len;
|
|
FILE *fp;
|
|
char *cp, *mp, *line;
|
|
char *hostname;
|
|
char *vhost, *anonuser, *statfile, *welcome, *loginmsg;
|
|
struct ftphost *hrp, *lhrp;
|
|
struct addrinfo hints, *res, *ai;
|
|
|
|
/*
|
|
* Fill in the default host information
|
|
*/
|
|
if ((hostname = malloc(MAXHOSTNAMELEN)) == NULL)
|
|
fatalerror("Ran out of memory.");
|
|
if (gethostname(hostname, MAXHOSTNAMELEN) < 0)
|
|
hostname[0] = '\0';
|
|
hostname[MAXHOSTNAMELEN - 1] = '\0';
|
|
if ((hrp = malloc(sizeof(struct ftphost))) == NULL)
|
|
fatalerror("Ran out of memory.");
|
|
hrp->hostname = hostname;
|
|
hrp->hostinfo = NULL;
|
|
|
|
memset(&hints, 0, sizeof(hints));
|
|
hints.ai_flags = AI_CANONNAME;
|
|
hints.ai_family = AF_UNSPEC;
|
|
if (getaddrinfo(hrp->hostname, NULL, &hints, &res) == 0)
|
|
hrp->hostinfo = res;
|
|
hrp->statfile = _PATH_FTPDSTATFILE;
|
|
hrp->welcome = _PATH_FTPWELCOME;
|
|
hrp->loginmsg = _PATH_FTPLOGINMESG;
|
|
hrp->anonuser = "ftp";
|
|
hrp->next = NULL;
|
|
thishost = firsthost = lhrp = hrp;
|
|
if ((fp = fopen(_PATH_FTPHOSTS, "r")) != NULL) {
|
|
int addrsize, gothost;
|
|
void *addr;
|
|
struct hostent *hp;
|
|
|
|
while ((line = fgetln(fp, &len)) != NULL) {
|
|
int i, hp_error;
|
|
|
|
/* skip comments */
|
|
if (line[0] == '#')
|
|
continue;
|
|
if (line[len - 1] == '\n') {
|
|
line[len - 1] = '\0';
|
|
mp = NULL;
|
|
} else {
|
|
if ((mp = malloc(len + 1)) == NULL)
|
|
fatalerror("Ran out of memory.");
|
|
memcpy(mp, line, len);
|
|
mp[len] = '\0';
|
|
line = mp;
|
|
}
|
|
cp = strtok(line, " \t");
|
|
/* skip empty lines */
|
|
if (cp == NULL)
|
|
goto nextline;
|
|
vhost = cp;
|
|
|
|
/* set defaults */
|
|
anonuser = "ftp";
|
|
statfile = _PATH_FTPDSTATFILE;
|
|
welcome = _PATH_FTPWELCOME;
|
|
loginmsg = _PATH_FTPLOGINMESG;
|
|
|
|
/*
|
|
* Preparse the line so we can use its info
|
|
* for all the addresses associated with
|
|
* the virtual host name.
|
|
* Field 0, the virtual host name, is special:
|
|
* it's already parsed off and will be strdup'ed
|
|
* later, after we know its canonical form.
|
|
*/
|
|
for (i = 1; i < 5 && (cp = strtok(NULL, " \t")); i++)
|
|
if (*cp != '-' && (cp = strdup(cp)))
|
|
switch (i) {
|
|
case 1: /* anon user permissions */
|
|
anonuser = cp;
|
|
break;
|
|
case 2: /* statistics file */
|
|
statfile = cp;
|
|
break;
|
|
case 3: /* welcome message */
|
|
welcome = cp;
|
|
break;
|
|
case 4: /* login message */
|
|
loginmsg = cp;
|
|
break;
|
|
default: /* programming error */
|
|
abort();
|
|
/* NOTREACHED */
|
|
}
|
|
|
|
hints.ai_flags = 0;
|
|
hints.ai_family = AF_UNSPEC;
|
|
hints.ai_flags = AI_PASSIVE;
|
|
if (getaddrinfo(vhost, NULL, &hints, &res) != 0)
|
|
goto nextline;
|
|
for (ai = res; ai != NULL && ai->ai_addr != NULL;
|
|
ai = ai->ai_next) {
|
|
|
|
gothost = 0;
|
|
for (hrp = firsthost; hrp != NULL; hrp = hrp->next) {
|
|
struct addrinfo *hi;
|
|
|
|
for (hi = hrp->hostinfo; hi != NULL;
|
|
hi = hi->ai_next)
|
|
if (hi->ai_addrlen == ai->ai_addrlen &&
|
|
memcmp(hi->ai_addr,
|
|
ai->ai_addr,
|
|
ai->ai_addr->sa_len) == 0) {
|
|
gothost++;
|
|
break;
|
|
}
|
|
if (gothost)
|
|
break;
|
|
}
|
|
if (hrp == NULL) {
|
|
if ((hrp = malloc(sizeof(struct ftphost))) == NULL)
|
|
goto nextline;
|
|
hrp->hostname = NULL;
|
|
insert = 1;
|
|
} else {
|
|
if (hrp->hostinfo && hrp->hostinfo != res)
|
|
freeaddrinfo(hrp->hostinfo);
|
|
insert = 0; /* host already in the chain */
|
|
}
|
|
hrp->hostinfo = res;
|
|
|
|
/*
|
|
* determine hostname to use.
|
|
* force defined name if there is a valid alias
|
|
* otherwise fallback to primary hostname
|
|
*/
|
|
/* XXX: getaddrinfo() can't do alias check */
|
|
switch(hrp->hostinfo->ai_family) {
|
|
case AF_INET:
|
|
addr = &((struct sockaddr_in *)hrp->hostinfo->ai_addr)->sin_addr;
|
|
addrsize = sizeof(struct in_addr);
|
|
break;
|
|
case AF_INET6:
|
|
addr = &((struct sockaddr_in6 *)hrp->hostinfo->ai_addr)->sin6_addr;
|
|
addrsize = sizeof(struct in6_addr);
|
|
break;
|
|
default:
|
|
/* should not reach here */
|
|
freeaddrinfo(hrp->hostinfo);
|
|
if (insert)
|
|
free(hrp); /*not in chain, can free*/
|
|
else
|
|
hrp->hostinfo = NULL; /*mark as blank*/
|
|
goto nextline;
|
|
/* NOTREACHED */
|
|
}
|
|
if ((hp = getipnodebyaddr(addr, addrsize,
|
|
hrp->hostinfo->ai_family,
|
|
&hp_error)) != NULL) {
|
|
if (strcmp(vhost, hp->h_name) != 0) {
|
|
if (hp->h_aliases == NULL)
|
|
vhost = hp->h_name;
|
|
else {
|
|
i = 0;
|
|
while (hp->h_aliases[i] &&
|
|
strcmp(vhost, hp->h_aliases[i]) != 0)
|
|
++i;
|
|
if (hp->h_aliases[i] == NULL)
|
|
vhost = hp->h_name;
|
|
}
|
|
}
|
|
}
|
|
if (hrp->hostname &&
|
|
strcmp(hrp->hostname, vhost) != 0) {
|
|
free(hrp->hostname);
|
|
hrp->hostname = NULL;
|
|
}
|
|
if (hrp->hostname == NULL &&
|
|
(hrp->hostname = strdup(vhost)) == NULL) {
|
|
freeaddrinfo(hrp->hostinfo);
|
|
hrp->hostinfo = NULL; /* mark as blank */
|
|
if (hp)
|
|
freehostent(hp);
|
|
goto nextline;
|
|
}
|
|
hrp->anonuser = anonuser;
|
|
hrp->statfile = statfile;
|
|
hrp->welcome = welcome;
|
|
hrp->loginmsg = loginmsg;
|
|
if (insert) {
|
|
hrp->next = NULL;
|
|
lhrp->next = hrp;
|
|
lhrp = hrp;
|
|
}
|
|
if (hp)
|
|
freehostent(hp);
|
|
}
|
|
nextline:
|
|
if (mp)
|
|
free(mp);
|
|
}
|
|
(void) fclose(fp);
|
|
}
|
|
}
|
|
|
|
static void
|
|
selecthost(union sockunion *su)
|
|
{
|
|
struct ftphost *hrp;
|
|
u_int16_t port;
|
|
#ifdef INET6
|
|
struct in6_addr *mapped_in6 = NULL;
|
|
#endif
|
|
struct addrinfo *hi;
|
|
|
|
#ifdef INET6
|
|
/*
|
|
* XXX IPv4 mapped IPv6 addr consideraton,
|
|
* specified in rfc2373.
|
|
*/
|
|
if (su->su_family == AF_INET6 &&
|
|
IN6_IS_ADDR_V4MAPPED(&su->su_sin6.sin6_addr))
|
|
mapped_in6 = &su->su_sin6.sin6_addr;
|
|
#endif
|
|
|
|
hrp = thishost = firsthost; /* default */
|
|
port = su->su_port;
|
|
su->su_port = 0;
|
|
while (hrp != NULL) {
|
|
for (hi = hrp->hostinfo; hi != NULL; hi = hi->ai_next) {
|
|
if (memcmp(su, hi->ai_addr, hi->ai_addrlen) == 0) {
|
|
thishost = hrp;
|
|
break;
|
|
}
|
|
#ifdef INET6
|
|
/* XXX IPv4 mapped IPv6 addr consideraton */
|
|
if (hi->ai_addr->sa_family == AF_INET && mapped_in6 != NULL &&
|
|
(memcmp(&mapped_in6->s6_addr[12],
|
|
&((struct sockaddr_in *)hi->ai_addr)->sin_addr,
|
|
sizeof(struct in_addr)) == 0)) {
|
|
thishost = hrp;
|
|
break;
|
|
}
|
|
#endif
|
|
}
|
|
hrp = hrp->next;
|
|
}
|
|
su->su_port = port;
|
|
/* setup static variables as appropriate */
|
|
hostname = thishost->hostname;
|
|
ftpuser = thishost->anonuser;
|
|
}
|
|
#endif
|
|
|
|
/*
|
|
* Helper function for sgetpwnam().
|
|
*/
|
|
static char *
|
|
sgetsave(char *s)
|
|
{
|
|
char *new = malloc(strlen(s) + 1);
|
|
|
|
if (new == NULL) {
|
|
perror_reply(421, "Local resource failure: malloc");
|
|
dologout(1);
|
|
/* NOTREACHED */
|
|
}
|
|
(void) strcpy(new, s);
|
|
return (new);
|
|
}
|
|
|
|
/*
|
|
* Save the result of a getpwnam. Used for USER command, since
|
|
* the data returned must not be clobbered by any other command
|
|
* (e.g., globbing).
|
|
* NB: The data returned by sgetpwnam() will remain valid until
|
|
* the next call to this function. Its difference from getpwnam()
|
|
* is that sgetpwnam() is known to be called from ftpd code only.
|
|
*/
|
|
static struct passwd *
|
|
sgetpwnam(char *name)
|
|
{
|
|
static struct passwd save;
|
|
struct passwd *p;
|
|
|
|
if ((p = getpwnam(name)) == NULL)
|
|
return (p);
|
|
if (save.pw_name) {
|
|
free(save.pw_name);
|
|
free(save.pw_passwd);
|
|
free(save.pw_gecos);
|
|
free(save.pw_dir);
|
|
free(save.pw_shell);
|
|
}
|
|
save = *p;
|
|
save.pw_name = sgetsave(p->pw_name);
|
|
save.pw_passwd = sgetsave(p->pw_passwd);
|
|
save.pw_gecos = sgetsave(p->pw_gecos);
|
|
save.pw_dir = sgetsave(p->pw_dir);
|
|
save.pw_shell = sgetsave(p->pw_shell);
|
|
return (&save);
|
|
}
|
|
|
|
static int login_attempts; /* number of failed login attempts */
|
|
static int askpasswd; /* had user command, ask for passwd */
|
|
static char curname[MAXLOGNAME]; /* current USER name */
|
|
|
|
/*
|
|
* USER command.
|
|
* Sets global passwd pointer pw if named account exists and is acceptable;
|
|
* sets askpasswd if a PASS command is expected. If logged in previously,
|
|
* need to reset state. If name is "ftp" or "anonymous", the name is not in
|
|
* _PATH_FTPUSERS, and ftp account exists, set guest and pw, then just return.
|
|
* If account doesn't exist, ask for passwd anyway. Otherwise, check user
|
|
* requesting login privileges. Disallow anyone who does not have a standard
|
|
* shell as returned by getusershell(). Disallow anyone mentioned in the file
|
|
* _PATH_FTPUSERS to allow people such as root and uucp to be avoided.
|
|
*/
|
|
void
|
|
user(char *name)
|
|
{
|
|
char *cp, *shell;
|
|
|
|
if (logged_in) {
|
|
if (guest) {
|
|
reply(530, "Can't change user from guest login.");
|
|
return;
|
|
} else if (dochroot) {
|
|
reply(530, "Can't change user from chroot user.");
|
|
return;
|
|
}
|
|
end_login();
|
|
}
|
|
|
|
guest = 0;
|
|
#ifdef VIRTUAL_HOSTING
|
|
pw = sgetpwnam(thishost->anonuser);
|
|
#else
|
|
pw = sgetpwnam("ftp");
|
|
#endif
|
|
if (strcmp(name, "ftp") == 0 || strcmp(name, "anonymous") == 0) {
|
|
if (checkuser(_PATH_FTPUSERS, "ftp", 0, NULL) ||
|
|
checkuser(_PATH_FTPUSERS, "anonymous", 0, NULL))
|
|
reply(530, "User %s access denied.", name);
|
|
else if (pw != NULL) {
|
|
guest = 1;
|
|
askpasswd = 1;
|
|
reply(331,
|
|
"Guest login ok, send your email address as password.");
|
|
} else
|
|
reply(530, "User %s unknown.", name);
|
|
if (!askpasswd && logging)
|
|
syslog(LOG_NOTICE,
|
|
"ANONYMOUS FTP LOGIN REFUSED FROM %s", remotehost);
|
|
return;
|
|
}
|
|
if (anon_only != 0) {
|
|
reply(530, "Sorry, only anonymous ftp allowed.");
|
|
return;
|
|
}
|
|
|
|
if ((pw = sgetpwnam(name))) {
|
|
if ((shell = pw->pw_shell) == NULL || *shell == 0)
|
|
shell = _PATH_BSHELL;
|
|
setusershell();
|
|
while ((cp = getusershell()) != NULL)
|
|
if (strcmp(cp, shell) == 0)
|
|
break;
|
|
endusershell();
|
|
|
|
if (cp == NULL || checkuser(_PATH_FTPUSERS, name, 1, NULL)) {
|
|
reply(530, "User %s access denied.", name);
|
|
if (logging)
|
|
syslog(LOG_NOTICE,
|
|
"FTP LOGIN REFUSED FROM %s, %s",
|
|
remotehost, name);
|
|
pw = (struct passwd *) NULL;
|
|
return;
|
|
}
|
|
}
|
|
if (logging)
|
|
strncpy(curname, name, sizeof(curname)-1);
|
|
|
|
pwok = 0;
|
|
#ifdef USE_PAM
|
|
/* XXX Kluge! The conversation mechanism needs to be fixed. */
|
|
#endif
|
|
if (opiechallenge(&opiedata, name, opieprompt) == 0) {
|
|
pwok = (pw != NULL) &&
|
|
opieaccessfile(remotehost) &&
|
|
opiealways(pw->pw_dir);
|
|
reply(331, "Response to %s %s for %s.",
|
|
opieprompt, pwok ? "requested" : "required", name);
|
|
} else {
|
|
pwok = 1;
|
|
reply(331, "Password required for %s.", name);
|
|
}
|
|
askpasswd = 1;
|
|
/*
|
|
* Delay before reading passwd after first failed
|
|
* attempt to slow down passwd-guessing programs.
|
|
*/
|
|
if (login_attempts)
|
|
sleep(login_attempts);
|
|
}
|
|
|
|
/*
|
|
* Check if a user is in the file "fname",
|
|
* return a pointer to a malloc'd string with the rest
|
|
* of the matching line in "residue" if not NULL.
|
|
*/
|
|
static int
|
|
checkuser(char *fname, char *name, int pwset, char **residue)
|
|
{
|
|
FILE *fd;
|
|
int found = 0;
|
|
size_t len;
|
|
char *line, *mp, *p;
|
|
|
|
if ((fd = fopen(fname, "r")) != NULL) {
|
|
while (!found && (line = fgetln(fd, &len)) != NULL) {
|
|
/* skip comments */
|
|
if (line[0] == '#')
|
|
continue;
|
|
if (line[len - 1] == '\n') {
|
|
line[len - 1] = '\0';
|
|
mp = NULL;
|
|
} else {
|
|
if ((mp = malloc(len + 1)) == NULL)
|
|
fatalerror("Ran out of memory.");
|
|
memcpy(mp, line, len);
|
|
mp[len] = '\0';
|
|
line = mp;
|
|
}
|
|
/* avoid possible leading and trailing whitespace */
|
|
p = strtok(line, " \t");
|
|
/* skip empty lines */
|
|
if (p == NULL)
|
|
goto nextline;
|
|
/*
|
|
* if first chr is '@', check group membership
|
|
*/
|
|
if (p[0] == '@') {
|
|
int i = 0;
|
|
struct group *grp;
|
|
|
|
if (p[1] == '\0') /* single @ matches anyone */
|
|
found = 1;
|
|
else {
|
|
if ((grp = getgrnam(p+1)) == NULL)
|
|
goto nextline;
|
|
/*
|
|
* Check user's default group
|
|
*/
|
|
if (pwset && grp->gr_gid == pw->pw_gid)
|
|
found = 1;
|
|
/*
|
|
* Check supplementary groups
|
|
*/
|
|
while (!found && grp->gr_mem[i])
|
|
found = strcmp(name,
|
|
grp->gr_mem[i++])
|
|
== 0;
|
|
}
|
|
}
|
|
/*
|
|
* Otherwise, just check for username match
|
|
*/
|
|
else
|
|
found = strcmp(p, name) == 0;
|
|
/*
|
|
* Save the rest of line to "residue" if matched
|
|
*/
|
|
if (found && residue) {
|
|
if ((p = strtok(NULL, "")) != NULL)
|
|
p += strspn(p, " \t");
|
|
if (p && *p) {
|
|
if ((*residue = strdup(p)) == NULL)
|
|
fatalerror("Ran out of memory.");
|
|
} else
|
|
*residue = NULL;
|
|
}
|
|
nextline:
|
|
if (mp)
|
|
free(mp);
|
|
}
|
|
(void) fclose(fd);
|
|
}
|
|
return (found);
|
|
}
|
|
|
|
/*
|
|
* Terminate login as previous user, if any, resetting state;
|
|
* used when USER command is given or login fails.
|
|
*/
|
|
static void
|
|
end_login(void)
|
|
{
|
|
#ifdef USE_PAM
|
|
int e;
|
|
#endif
|
|
|
|
(void) seteuid(0);
|
|
if (logged_in && dowtmp)
|
|
ftpd_logwtmp(ttyline, "", NULL);
|
|
pw = NULL;
|
|
#ifdef LOGIN_CAP
|
|
setusercontext(NULL, getpwuid(0), 0,
|
|
LOGIN_SETPRIORITY|LOGIN_SETRESOURCES|LOGIN_SETUMASK|
|
|
LOGIN_SETMAC);
|
|
#endif
|
|
#ifdef USE_PAM
|
|
if (pamh) {
|
|
if ((e = pam_setcred(pamh, PAM_DELETE_CRED)) != PAM_SUCCESS)
|
|
syslog(LOG_ERR, "pam_setcred: %s", pam_strerror(pamh, e));
|
|
if ((e = pam_close_session(pamh,0)) != PAM_SUCCESS)
|
|
syslog(LOG_ERR, "pam_close_session: %s", pam_strerror(pamh, e));
|
|
if ((e = pam_end(pamh, e)) != PAM_SUCCESS)
|
|
syslog(LOG_ERR, "pam_end: %s", pam_strerror(pamh, e));
|
|
pamh = NULL;
|
|
}
|
|
#endif
|
|
logged_in = 0;
|
|
guest = 0;
|
|
dochroot = 0;
|
|
}
|
|
|
|
#ifdef USE_PAM
|
|
|
|
/*
|
|
* the following code is stolen from imap-uw PAM authentication module and
|
|
* login.c
|
|
*/
|
|
#define COPY_STRING(s) (s ? strdup(s) : NULL)
|
|
|
|
struct cred_t {
|
|
const char *uname; /* user name */
|
|
const char *pass; /* password */
|
|
};
|
|
typedef struct cred_t cred_t;
|
|
|
|
static int
|
|
auth_conv(int num_msg, const struct pam_message **msg,
|
|
struct pam_response **resp, void *appdata)
|
|
{
|
|
int i;
|
|
cred_t *cred = (cred_t *) appdata;
|
|
struct pam_response *reply;
|
|
|
|
reply = calloc(num_msg, sizeof *reply);
|
|
if (reply == NULL)
|
|
return PAM_BUF_ERR;
|
|
|
|
for (i = 0; i < num_msg; i++) {
|
|
switch (msg[i]->msg_style) {
|
|
case PAM_PROMPT_ECHO_ON: /* assume want user name */
|
|
reply[i].resp_retcode = PAM_SUCCESS;
|
|
reply[i].resp = COPY_STRING(cred->uname);
|
|
/* PAM frees resp. */
|
|
break;
|
|
case PAM_PROMPT_ECHO_OFF: /* assume want password */
|
|
reply[i].resp_retcode = PAM_SUCCESS;
|
|
reply[i].resp = COPY_STRING(cred->pass);
|
|
/* PAM frees resp. */
|
|
break;
|
|
case PAM_TEXT_INFO:
|
|
case PAM_ERROR_MSG:
|
|
reply[i].resp_retcode = PAM_SUCCESS;
|
|
reply[i].resp = NULL;
|
|
break;
|
|
default: /* unknown message style */
|
|
free(reply);
|
|
return PAM_CONV_ERR;
|
|
}
|
|
}
|
|
|
|
*resp = reply;
|
|
return PAM_SUCCESS;
|
|
}
|
|
|
|
/*
|
|
* Attempt to authenticate the user using PAM. Returns 0 if the user is
|
|
* authenticated, or 1 if not authenticated. If some sort of PAM system
|
|
* error occurs (e.g., the "/etc/pam.conf" file is missing) then this
|
|
* function returns -1. This can be used as an indication that we should
|
|
* fall back to a different authentication mechanism.
|
|
*/
|
|
static int
|
|
auth_pam(struct passwd **ppw, const char *pass)
|
|
{
|
|
const char *tmpl_user;
|
|
const void *item;
|
|
int rval;
|
|
int e;
|
|
cred_t auth_cred = { (*ppw)->pw_name, pass };
|
|
struct pam_conv conv = { &auth_conv, &auth_cred };
|
|
|
|
e = pam_start("ftpd", (*ppw)->pw_name, &conv, &pamh);
|
|
if (e != PAM_SUCCESS) {
|
|
/*
|
|
* In OpenPAM, it's OK to pass NULL to pam_strerror()
|
|
* if context creation has failed in the first place.
|
|
*/
|
|
syslog(LOG_ERR, "pam_start: %s", pam_strerror(NULL, e));
|
|
return -1;
|
|
}
|
|
|
|
e = pam_set_item(pamh, PAM_RHOST, remotehost);
|
|
if (e != PAM_SUCCESS) {
|
|
syslog(LOG_ERR, "pam_set_item(PAM_RHOST): %s",
|
|
pam_strerror(pamh, e));
|
|
if ((e = pam_end(pamh, e)) != PAM_SUCCESS) {
|
|
syslog(LOG_ERR, "pam_end: %s", pam_strerror(pamh, e));
|
|
}
|
|
pamh = NULL;
|
|
return -1;
|
|
}
|
|
|
|
e = pam_authenticate(pamh, 0);
|
|
switch (e) {
|
|
case PAM_SUCCESS:
|
|
/*
|
|
* With PAM we support the concept of a "template"
|
|
* user. The user enters a login name which is
|
|
* authenticated by PAM, usually via a remote service
|
|
* such as RADIUS or TACACS+. If authentication
|
|
* succeeds, a different but related "template" name
|
|
* is used for setting the credentials, shell, and
|
|
* home directory. The name the user enters need only
|
|
* exist on the remote authentication server, but the
|
|
* template name must be present in the local password
|
|
* database.
|
|
*
|
|
* This is supported by two various mechanisms in the
|
|
* individual modules. However, from the application's
|
|
* point of view, the template user is always passed
|
|
* back as a changed value of the PAM_USER item.
|
|
*/
|
|
if ((e = pam_get_item(pamh, PAM_USER, &item)) ==
|
|
PAM_SUCCESS) {
|
|
tmpl_user = (const char *) item;
|
|
if (strcmp((*ppw)->pw_name, tmpl_user) != 0)
|
|
*ppw = getpwnam(tmpl_user);
|
|
} else
|
|
syslog(LOG_ERR, "Couldn't get PAM_USER: %s",
|
|
pam_strerror(pamh, e));
|
|
rval = 0;
|
|
break;
|
|
|
|
case PAM_AUTH_ERR:
|
|
case PAM_USER_UNKNOWN:
|
|
case PAM_MAXTRIES:
|
|
rval = 1;
|
|
break;
|
|
|
|
default:
|
|
syslog(LOG_ERR, "pam_authenticate: %s", pam_strerror(pamh, e));
|
|
rval = -1;
|
|
break;
|
|
}
|
|
|
|
if (rval == 0) {
|
|
e = pam_acct_mgmt(pamh, 0);
|
|
if (e == PAM_NEW_AUTHTOK_REQD) {
|
|
e = pam_chauthtok(pamh, PAM_CHANGE_EXPIRED_AUTHTOK);
|
|
if (e != PAM_SUCCESS) {
|
|
syslog(LOG_ERR, "pam_chauthtok: %s", pam_strerror(pamh, e));
|
|
rval = 1;
|
|
}
|
|
} else if (e != PAM_SUCCESS) {
|
|
rval = 1;
|
|
}
|
|
}
|
|
|
|
if (rval != 0) {
|
|
if ((e = pam_end(pamh, e)) != PAM_SUCCESS) {
|
|
syslog(LOG_ERR, "pam_end: %s", pam_strerror(pamh, e));
|
|
}
|
|
pamh = NULL;
|
|
}
|
|
return rval;
|
|
}
|
|
|
|
#endif /* USE_PAM */
|
|
|
|
void
|
|
pass(char *passwd)
|
|
{
|
|
int rval;
|
|
FILE *fd;
|
|
#ifdef LOGIN_CAP
|
|
login_cap_t *lc = NULL;
|
|
#endif
|
|
#ifdef USE_PAM
|
|
int e;
|
|
#endif
|
|
char *chrootdir;
|
|
char *residue = NULL;
|
|
char *xpasswd;
|
|
|
|
if (logged_in || askpasswd == 0) {
|
|
reply(503, "Login with USER first.");
|
|
return;
|
|
}
|
|
askpasswd = 0;
|
|
if (!guest) { /* "ftp" is only account allowed no password */
|
|
if (pw == NULL) {
|
|
rval = 1; /* failure below */
|
|
goto skip;
|
|
}
|
|
#ifdef USE_PAM
|
|
rval = auth_pam(&pw, passwd);
|
|
if (rval >= 0) {
|
|
opieunlock();
|
|
goto skip;
|
|
}
|
|
#endif
|
|
if (opieverify(&opiedata, passwd) == 0)
|
|
xpasswd = pw->pw_passwd;
|
|
else if (pwok) {
|
|
xpasswd = crypt(passwd, pw->pw_passwd);
|
|
if (passwd[0] == '\0' && pw->pw_passwd[0] != '\0')
|
|
xpasswd = ":";
|
|
} else {
|
|
rval = 1;
|
|
goto skip;
|
|
}
|
|
rval = strcmp(pw->pw_passwd, xpasswd);
|
|
if (pw->pw_expire && time(NULL) >= pw->pw_expire)
|
|
rval = 1; /* failure */
|
|
skip:
|
|
/*
|
|
* If rval == 1, the user failed the authentication check
|
|
* above. If rval == 0, either PAM or local authentication
|
|
* succeeded.
|
|
*/
|
|
if (rval) {
|
|
reply(530, "Login incorrect.");
|
|
if (logging) {
|
|
syslog(LOG_NOTICE,
|
|
"FTP LOGIN FAILED FROM %s",
|
|
remotehost);
|
|
syslog(LOG_AUTHPRIV | LOG_NOTICE,
|
|
"FTP LOGIN FAILED FROM %s, %s",
|
|
remotehost, curname);
|
|
}
|
|
pw = NULL;
|
|
if (login_attempts++ >= 5) {
|
|
syslog(LOG_NOTICE,
|
|
"repeated login failures from %s",
|
|
remotehost);
|
|
exit(0);
|
|
}
|
|
return;
|
|
}
|
|
}
|
|
login_attempts = 0; /* this time successful */
|
|
if (setegid(pw->pw_gid) < 0) {
|
|
reply(550, "Can't set gid.");
|
|
return;
|
|
}
|
|
/* May be overridden by login.conf */
|
|
(void) umask(defumask);
|
|
#ifdef LOGIN_CAP
|
|
if ((lc = login_getpwclass(pw)) != NULL) {
|
|
char remote_ip[MAXHOSTNAMELEN];
|
|
|
|
getnameinfo((struct sockaddr *)&his_addr, his_addr.su_len,
|
|
remote_ip, sizeof(remote_ip) - 1, NULL, 0,
|
|
NI_NUMERICHOST);
|
|
remote_ip[sizeof(remote_ip) - 1] = 0;
|
|
if (!auth_hostok(lc, remotehost, remote_ip)) {
|
|
syslog(LOG_INFO|LOG_AUTH,
|
|
"FTP LOGIN FAILED (HOST) as %s: permission denied.",
|
|
pw->pw_name);
|
|
reply(530, "Permission denied.\n");
|
|
pw = NULL;
|
|
return;
|
|
}
|
|
if (!auth_timeok(lc, time(NULL))) {
|
|
reply(530, "Login not available right now.\n");
|
|
pw = NULL;
|
|
return;
|
|
}
|
|
}
|
|
setusercontext(lc, pw, 0,
|
|
LOGIN_SETLOGIN|LOGIN_SETGROUP|LOGIN_SETPRIORITY|
|
|
LOGIN_SETRESOURCES|LOGIN_SETUMASK|LOGIN_SETMAC);
|
|
#else
|
|
setlogin(pw->pw_name);
|
|
(void) initgroups(pw->pw_name, pw->pw_gid);
|
|
#endif
|
|
|
|
#ifdef USE_PAM
|
|
if (pamh) {
|
|
if ((e = pam_open_session(pamh, 0)) != PAM_SUCCESS) {
|
|
syslog(LOG_ERR, "pam_open_session: %s", pam_strerror(pamh, e));
|
|
} else if ((e = pam_setcred(pamh, PAM_ESTABLISH_CRED)) != PAM_SUCCESS) {
|
|
syslog(LOG_ERR, "pam_setcred: %s", pam_strerror(pamh, e));
|
|
}
|
|
}
|
|
#endif
|
|
|
|
/* open wtmp before chroot */
|
|
if (dowtmp)
|
|
ftpd_logwtmp(ttyline, pw->pw_name,
|
|
(struct sockaddr *)&his_addr);
|
|
logged_in = 1;
|
|
|
|
if (guest && stats && statfd < 0)
|
|
#ifdef VIRTUAL_HOSTING
|
|
statfd = open(thishost->statfile, O_WRONLY|O_APPEND);
|
|
#else
|
|
statfd = open(_PATH_FTPDSTATFILE, O_WRONLY|O_APPEND);
|
|
#endif
|
|
if (statfd < 0)
|
|
stats = 0;
|
|
|
|
dochroot =
|
|
checkuser(_PATH_FTPCHROOT, pw->pw_name, 1, &residue)
|
|
#ifdef LOGIN_CAP /* Allow login.conf configuration as well */
|
|
|| login_getcapbool(lc, "ftp-chroot", 0)
|
|
#endif
|
|
;
|
|
chrootdir = NULL;
|
|
/*
|
|
* For a chrooted local user,
|
|
* a) see whether ftpchroot(5) specifies a chroot directory,
|
|
* b) extract the directory pathname from the line,
|
|
* c) expand it to the absolute pathname if necessary.
|
|
*/
|
|
if (dochroot && residue &&
|
|
(chrootdir = strtok(residue, " \t")) != NULL) {
|
|
if (chrootdir[0] != '/')
|
|
asprintf(&chrootdir, "%s/%s", pw->pw_dir, chrootdir);
|
|
else
|
|
chrootdir = strdup(chrootdir); /* so it can be freed */
|
|
if (chrootdir == NULL)
|
|
fatalerror("Ran out of memory.");
|
|
}
|
|
if (guest || dochroot) {
|
|
/*
|
|
* If no chroot directory set yet, use the login directory.
|
|
* Copy it so it can be modified while pw->pw_dir stays intact.
|
|
*/
|
|
if (chrootdir == NULL &&
|
|
(chrootdir = strdup(pw->pw_dir)) == NULL)
|
|
fatalerror("Ran out of memory.");
|
|
/*
|
|
* Check for the "/chroot/./home" syntax,
|
|
* separate the chroot and home directory pathnames.
|
|
*/
|
|
if ((homedir = strstr(chrootdir, "/./")) != NULL) {
|
|
*(homedir++) = '\0'; /* wipe '/' */
|
|
homedir++; /* skip '.' */
|
|
/* so chrootdir can be freed later */
|
|
if ((homedir = strdup(homedir)) == NULL)
|
|
fatalerror("Ran out of memory.");
|
|
} else {
|
|
/*
|
|
* We MUST do a chdir() after the chroot. Otherwise
|
|
* the old current directory will be accessible as "."
|
|
* outside the new root!
|
|
*/
|
|
homedir = "/";
|
|
}
|
|
/*
|
|
* Finally, do chroot()
|
|
*/
|
|
if (chroot(chrootdir) < 0) {
|
|
reply(550, "Can't change root.");
|
|
goto bad;
|
|
}
|
|
} else /* real user w/o chroot */
|
|
homedir = pw->pw_dir;
|
|
/*
|
|
* Set euid *before* doing chdir() so
|
|
* a) the user won't be carried to a directory that he couldn't reach
|
|
* on his own due to no permission to upper path components,
|
|
* b) NFS mounted homedirs w/restrictive permissions will be accessible
|
|
* (uid 0 has no root power over NFS if not mapped explicitly.)
|
|
*/
|
|
if (seteuid(pw->pw_uid) < 0) {
|
|
reply(550, "Can't set uid.");
|
|
goto bad;
|
|
}
|
|
if (chdir(homedir) < 0) {
|
|
if (guest || dochroot) {
|
|
reply(550, "Can't change to base directory.");
|
|
goto bad;
|
|
} else {
|
|
if (chdir("/") < 0) {
|
|
reply(550, "Root is inaccessible.");
|
|
goto bad;
|
|
}
|
|
lreply(230, "No directory! Logging in with home=/");
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Display a login message, if it exists.
|
|
* N.B. reply(230,) must follow the message.
|
|
*/
|
|
#ifdef VIRTUAL_HOSTING
|
|
fd = fopen(thishost->loginmsg, "r");
|
|
#else
|
|
fd = fopen(_PATH_FTPLOGINMESG, "r");
|
|
#endif
|
|
if (fd != NULL) {
|
|
char *cp, line[LINE_MAX];
|
|
|
|
while (fgets(line, sizeof(line), fd) != NULL) {
|
|
if ((cp = strchr(line, '\n')) != NULL)
|
|
*cp = '\0';
|
|
lreply(230, "%s", line);
|
|
}
|
|
(void) fflush(stdout);
|
|
(void) fclose(fd);
|
|
}
|
|
if (guest) {
|
|
if (ident != NULL)
|
|
free(ident);
|
|
ident = strdup(passwd);
|
|
if (ident == NULL)
|
|
fatalerror("Ran out of memory.");
|
|
|
|
reply(230, "Guest login ok, access restrictions apply.");
|
|
#ifdef SETPROCTITLE
|
|
#ifdef VIRTUAL_HOSTING
|
|
if (thishost != firsthost)
|
|
snprintf(proctitle, sizeof(proctitle),
|
|
"%s: anonymous(%s)/%s", remotehost, hostname,
|
|
passwd);
|
|
else
|
|
#endif
|
|
snprintf(proctitle, sizeof(proctitle),
|
|
"%s: anonymous/%s", remotehost, passwd);
|
|
setproctitle("%s", proctitle);
|
|
#endif /* SETPROCTITLE */
|
|
if (logging)
|
|
syslog(LOG_INFO, "ANONYMOUS FTP LOGIN FROM %s, %s",
|
|
remotehost, passwd);
|
|
} else {
|
|
if (dochroot)
|
|
reply(230, "User %s logged in, "
|
|
"access restrictions apply.", pw->pw_name);
|
|
else
|
|
reply(230, "User %s logged in.", pw->pw_name);
|
|
|
|
#ifdef SETPROCTITLE
|
|
snprintf(proctitle, sizeof(proctitle),
|
|
"%s: user/%s", remotehost, pw->pw_name);
|
|
setproctitle("%s", proctitle);
|
|
#endif /* SETPROCTITLE */
|
|
if (logging)
|
|
syslog(LOG_INFO, "FTP LOGIN FROM %s as %s",
|
|
remotehost, pw->pw_name);
|
|
}
|
|
#ifdef LOGIN_CAP
|
|
login_close(lc);
|
|
#endif
|
|
if (chrootdir)
|
|
free(chrootdir);
|
|
if (residue)
|
|
free(residue);
|
|
return;
|
|
bad:
|
|
/* Forget all about it... */
|
|
#ifdef LOGIN_CAP
|
|
login_close(lc);
|
|
#endif
|
|
if (chrootdir)
|
|
free(chrootdir);
|
|
if (residue)
|
|
free(residue);
|
|
end_login();
|
|
}
|
|
|
|
void
|
|
retrieve(char *cmd, char *name)
|
|
{
|
|
FILE *fin, *dout;
|
|
struct stat st;
|
|
int (*closefunc)(FILE *);
|
|
time_t start;
|
|
|
|
if (cmd == 0) {
|
|
fin = fopen(name, "r"), closefunc = fclose;
|
|
st.st_size = 0;
|
|
} else {
|
|
char line[BUFSIZ];
|
|
|
|
(void) snprintf(line, sizeof(line), cmd, name), name = line;
|
|
fin = ftpd_popen(line, "r"), closefunc = ftpd_pclose;
|
|
st.st_size = -1;
|
|
st.st_blksize = BUFSIZ;
|
|
}
|
|
if (fin == NULL) {
|
|
if (errno != 0) {
|
|
perror_reply(550, name);
|
|
if (cmd == 0) {
|
|
LOGCMD("get", name);
|
|
}
|
|
}
|
|
return;
|
|
}
|
|
byte_count = -1;
|
|
if (cmd == 0) {
|
|
if (fstat(fileno(fin), &st) < 0) {
|
|
perror_reply(550, name);
|
|
goto done;
|
|
}
|
|
if (!S_ISREG(st.st_mode)) {
|
|
/*
|
|
* Never sending a raw directory is a workaround
|
|
* for buggy clients that will attempt to RETR
|
|
* a directory before listing it, e.g., Mozilla.
|
|
* Preventing a guest from getting irregular files
|
|
* is a simple security measure.
|
|
*/
|
|
if (S_ISDIR(st.st_mode) || guest) {
|
|
reply(550, "%s: not a plain file.", name);
|
|
goto done;
|
|
}
|
|
st.st_size = -1;
|
|
/* st.st_blksize is set for all descriptor types */
|
|
}
|
|
}
|
|
if (restart_point) {
|
|
if (type == TYPE_A) {
|
|
off_t i, n;
|
|
int c;
|
|
|
|
n = restart_point;
|
|
i = 0;
|
|
while (i++ < n) {
|
|
if ((c=getc(fin)) == EOF) {
|
|
perror_reply(550, name);
|
|
goto done;
|
|
}
|
|
if (c == '\n')
|
|
i++;
|
|
}
|
|
} else if (lseek(fileno(fin), restart_point, L_SET) < 0) {
|
|
perror_reply(550, name);
|
|
goto done;
|
|
}
|
|
}
|
|
dout = dataconn(name, st.st_size, "w");
|
|
if (dout == NULL)
|
|
goto done;
|
|
time(&start);
|
|
send_data(fin, dout, st.st_blksize, st.st_size,
|
|
restart_point == 0 && cmd == 0 && S_ISREG(st.st_mode));
|
|
if (cmd == 0 && guest && stats && byte_count > 0)
|
|
logxfer(name, byte_count, start);
|
|
(void) fclose(dout);
|
|
data = -1;
|
|
pdata = -1;
|
|
done:
|
|
if (cmd == 0)
|
|
LOGBYTES("get", name, byte_count);
|
|
(*closefunc)(fin);
|
|
}
|
|
|
|
void
|
|
store(char *name, char *mode, int unique)
|
|
{
|
|
int fd;
|
|
FILE *fout, *din;
|
|
int (*closefunc)(FILE *);
|
|
|
|
if (*mode == 'a') { /* APPE */
|
|
if (unique) {
|
|
/* Programming error */
|
|
syslog(LOG_ERR, "Internal: unique flag to APPE");
|
|
unique = 0;
|
|
}
|
|
if (guest && noguestmod) {
|
|
reply(550, "Appending to existing file denied");
|
|
goto err;
|
|
}
|
|
restart_point = 0; /* not affected by preceding REST */
|
|
}
|
|
if (unique) /* STOU overrides REST */
|
|
restart_point = 0;
|
|
if (guest && noguestmod) {
|
|
if (restart_point) { /* guest STOR w/REST */
|
|
reply(550, "Modifying existing file denied");
|
|
goto err;
|
|
} else /* treat guest STOR as STOU */
|
|
unique = 1;
|
|
}
|
|
|
|
if (restart_point)
|
|
mode = "r+"; /* so ASCII manual seek can work */
|
|
if (unique) {
|
|
if ((fd = guniquefd(name, &name)) < 0)
|
|
goto err;
|
|
fout = fdopen(fd, mode);
|
|
} else
|
|
fout = fopen(name, mode);
|
|
closefunc = fclose;
|
|
if (fout == NULL) {
|
|
perror_reply(553, name);
|
|
goto err;
|
|
}
|
|
byte_count = -1;
|
|
if (restart_point) {
|
|
if (type == TYPE_A) {
|
|
off_t i, n;
|
|
int c;
|
|
|
|
n = restart_point;
|
|
i = 0;
|
|
while (i++ < n) {
|
|
if ((c=getc(fout)) == EOF) {
|
|
perror_reply(550, name);
|
|
goto done;
|
|
}
|
|
if (c == '\n')
|
|
i++;
|
|
}
|
|
/*
|
|
* We must do this seek to "current" position
|
|
* because we are changing from reading to
|
|
* writing.
|
|
*/
|
|
if (fseeko(fout, 0, SEEK_CUR) < 0) {
|
|
perror_reply(550, name);
|
|
goto done;
|
|
}
|
|
} else if (lseek(fileno(fout), restart_point, L_SET) < 0) {
|
|
perror_reply(550, name);
|
|
goto done;
|
|
}
|
|
}
|
|
din = dataconn(name, -1, "r");
|
|
if (din == NULL)
|
|
goto done;
|
|
if (receive_data(din, fout) == 0) {
|
|
if (unique)
|
|
reply(226, "Transfer complete (unique file name:%s).",
|
|
name);
|
|
else
|
|
reply(226, "Transfer complete.");
|
|
}
|
|
(void) fclose(din);
|
|
data = -1;
|
|
pdata = -1;
|
|
done:
|
|
LOGBYTES(*mode == 'a' ? "append" : "put", name, byte_count);
|
|
(*closefunc)(fout);
|
|
return;
|
|
err:
|
|
LOGCMD(*mode == 'a' ? "append" : "put" , name);
|
|
return;
|
|
}
|
|
|
|
static FILE *
|
|
getdatasock(char *mode)
|
|
{
|
|
int on = 1, s, t, tries;
|
|
|
|
if (data >= 0)
|
|
return (fdopen(data, mode));
|
|
|
|
s = socket(data_dest.su_family, SOCK_STREAM, 0);
|
|
if (s < 0)
|
|
goto bad;
|
|
if (setsockopt(s, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on)) < 0)
|
|
syslog(LOG_WARNING, "data setsockopt (SO_REUSEADDR): %m");
|
|
/* anchor socket to avoid multi-homing problems */
|
|
data_source = ctrl_addr;
|
|
data_source.su_port = htons(dataport);
|
|
(void) seteuid(0);
|
|
for (tries = 1; ; tries++) {
|
|
/*
|
|
* We should loop here since it's possible that
|
|
* another ftpd instance has passed this point and is
|
|
* trying to open a data connection in active mode now.
|
|
* Until the other connection is opened, we'll be getting
|
|
* EADDRINUSE because no SOCK_STREAM sockets in the system
|
|
* can share both local and remote addresses, localIP:20
|
|
* and *:* in this case.
|
|
*/
|
|
if (bind(s, (struct sockaddr *)&data_source,
|
|
data_source.su_len) >= 0)
|
|
break;
|
|
if (errno != EADDRINUSE || tries > 10)
|
|
goto bad;
|
|
sleep(tries);
|
|
}
|
|
(void) seteuid(pw->pw_uid);
|
|
#ifdef IP_TOS
|
|
if (data_source.su_family == AF_INET)
|
|
{
|
|
on = IPTOS_THROUGHPUT;
|
|
if (setsockopt(s, IPPROTO_IP, IP_TOS, &on, sizeof(int)) < 0)
|
|
syslog(LOG_WARNING, "data setsockopt (IP_TOS): %m");
|
|
}
|
|
#endif
|
|
#ifdef TCP_NOPUSH
|
|
/*
|
|
* Turn off push flag to keep sender TCP from sending short packets
|
|
* at the boundaries of each write(). Should probably do a SO_SNDBUF
|
|
* to set the send buffer size as well, but that may not be desirable
|
|
* in heavy-load situations.
|
|
*/
|
|
on = 1;
|
|
if (setsockopt(s, IPPROTO_TCP, TCP_NOPUSH, &on, sizeof on) < 0)
|
|
syslog(LOG_WARNING, "data setsockopt (TCP_NOPUSH): %m");
|
|
#endif
|
|
#ifdef SO_SNDBUF
|
|
on = 65536;
|
|
if (setsockopt(s, SOL_SOCKET, SO_SNDBUF, &on, sizeof on) < 0)
|
|
syslog(LOG_WARNING, "data setsockopt (SO_SNDBUF): %m");
|
|
#endif
|
|
|
|
return (fdopen(s, mode));
|
|
bad:
|
|
/* Return the real value of errno (close may change it) */
|
|
t = errno;
|
|
(void) seteuid(pw->pw_uid);
|
|
(void) close(s);
|
|
errno = t;
|
|
return (NULL);
|
|
}
|
|
|
|
static FILE *
|
|
dataconn(char *name, off_t size, char *mode)
|
|
{
|
|
char sizebuf[32];
|
|
FILE *file;
|
|
int retry = 0, tos, conerrno;
|
|
|
|
file_size = size;
|
|
byte_count = 0;
|
|
if (size != -1)
|
|
(void) snprintf(sizebuf, sizeof(sizebuf),
|
|
" (%jd bytes)", (intmax_t)size);
|
|
else
|
|
*sizebuf = '\0';
|
|
if (pdata >= 0) {
|
|
union sockunion from;
|
|
int flags;
|
|
int s, fromlen = ctrl_addr.su_len;
|
|
struct timeval timeout;
|
|
fd_set set;
|
|
|
|
FD_ZERO(&set);
|
|
FD_SET(pdata, &set);
|
|
|
|
timeout.tv_usec = 0;
|
|
timeout.tv_sec = 120;
|
|
|
|
/*
|
|
* Granted a socket is in the blocking I/O mode,
|
|
* accept() will block after a successful select()
|
|
* if the selected connection dies in between.
|
|
* Therefore set the non-blocking I/O flag here.
|
|
*/
|
|
if ((flags = fcntl(pdata, F_GETFL, 0)) == -1 ||
|
|
fcntl(pdata, F_SETFL, flags | O_NONBLOCK) == -1)
|
|
goto pdata_err;
|
|
if (select(pdata+1, &set, NULL, NULL, &timeout) <= 0 ||
|
|
(s = accept(pdata, (struct sockaddr *) &from, &fromlen)) < 0)
|
|
goto pdata_err;
|
|
(void) close(pdata);
|
|
pdata = s;
|
|
/*
|
|
* Unset the inherited non-blocking I/O flag
|
|
* on the child socket so stdio can work on it.
|
|
*/
|
|
if ((flags = fcntl(pdata, F_GETFL, 0)) == -1 ||
|
|
fcntl(pdata, F_SETFL, flags & ~O_NONBLOCK) == -1)
|
|
goto pdata_err;
|
|
#ifdef IP_TOS
|
|
if (from.su_family == AF_INET)
|
|
{
|
|
tos = IPTOS_THROUGHPUT;
|
|
if (setsockopt(s, IPPROTO_IP, IP_TOS, &tos, sizeof(int)) < 0)
|
|
syslog(LOG_WARNING, "pdata setsockopt (IP_TOS): %m");
|
|
}
|
|
#endif
|
|
reply(150, "Opening %s mode data connection for '%s'%s.",
|
|
type == TYPE_A ? "ASCII" : "BINARY", name, sizebuf);
|
|
return (fdopen(pdata, mode));
|
|
pdata_err:
|
|
reply(425, "Can't open data connection.");
|
|
(void) close(pdata);
|
|
pdata = -1;
|
|
return (NULL);
|
|
}
|
|
if (data >= 0) {
|
|
reply(125, "Using existing data connection for '%s'%s.",
|
|
name, sizebuf);
|
|
usedefault = 1;
|
|
return (fdopen(data, mode));
|
|
}
|
|
if (usedefault)
|
|
data_dest = his_addr;
|
|
usedefault = 1;
|
|
do {
|
|
file = getdatasock(mode);
|
|
if (file == NULL) {
|
|
char hostbuf[BUFSIZ], portbuf[BUFSIZ];
|
|
getnameinfo((struct sockaddr *)&data_source,
|
|
data_source.su_len, hostbuf, sizeof(hostbuf) - 1,
|
|
portbuf, sizeof(portbuf),
|
|
NI_NUMERICHOST|NI_NUMERICSERV);
|
|
reply(425, "Can't create data socket (%s,%s): %s.",
|
|
hostbuf, portbuf, strerror(errno));
|
|
return (NULL);
|
|
}
|
|
data = fileno(file);
|
|
conerrno = 0;
|
|
if (connect(data, (struct sockaddr *)&data_dest,
|
|
data_dest.su_len) == 0)
|
|
break;
|
|
conerrno = errno;
|
|
(void) fclose(file);
|
|
data = -1;
|
|
if (conerrno == EADDRINUSE) {
|
|
sleep(swaitint);
|
|
retry += swaitint;
|
|
} else {
|
|
break;
|
|
}
|
|
} while (retry <= swaitmax);
|
|
if (conerrno != 0) {
|
|
perror_reply(425, "Can't build data connection");
|
|
return (NULL);
|
|
}
|
|
reply(150, "Opening %s mode data connection for '%s'%s.",
|
|
type == TYPE_A ? "ASCII" : "BINARY", name, sizebuf);
|
|
return (file);
|
|
}
|
|
|
|
/*
|
|
* Tranfer the contents of "instr" to "outstr" peer using the appropriate
|
|
* encapsulation of the data subject to Mode, Structure, and Type.
|
|
*
|
|
* NB: Form isn't handled.
|
|
*/
|
|
static int
|
|
send_data(FILE *instr, FILE *outstr, size_t blksize, off_t filesize, int isreg)
|
|
{
|
|
int c, cp, filefd, netfd;
|
|
char *buf;
|
|
off_t cnt;
|
|
|
|
transflag++;
|
|
switch (type) {
|
|
|
|
case TYPE_A:
|
|
cp = '\0';
|
|
while ((c = getc(instr)) != EOF) {
|
|
if (recvurg)
|
|
goto got_oob;
|
|
byte_count++;
|
|
if (c == '\n' && cp != '\r') {
|
|
if (ferror(outstr))
|
|
goto data_err;
|
|
(void) putc('\r', outstr);
|
|
}
|
|
(void) putc(c, outstr);
|
|
cp = c;
|
|
}
|
|
if (recvurg)
|
|
goto got_oob;
|
|
fflush(outstr);
|
|
transflag = 0;
|
|
if (ferror(instr))
|
|
goto file_err;
|
|
if (ferror(outstr))
|
|
goto data_err;
|
|
reply(226, "Transfer complete.");
|
|
return (0);
|
|
|
|
case TYPE_I:
|
|
case TYPE_L:
|
|
/*
|
|
* isreg is only set if we are not doing restart and we
|
|
* are sending a regular file
|
|
*/
|
|
netfd = fileno(outstr);
|
|
filefd = fileno(instr);
|
|
|
|
if (isreg) {
|
|
|
|
char *msg = "Transfer complete.";
|
|
off_t offset;
|
|
int err;
|
|
|
|
cnt = offset = 0;
|
|
|
|
while (filesize > 0) {
|
|
err = sendfile(filefd, netfd, offset, 0,
|
|
(struct sf_hdtr *) NULL, &cnt, 0);
|
|
/*
|
|
* Calculate byte_count before OOB processing.
|
|
* It can be used in myoob() later.
|
|
*/
|
|
byte_count += cnt;
|
|
if (recvurg)
|
|
goto got_oob;
|
|
offset += cnt;
|
|
filesize -= cnt;
|
|
|
|
if (err == -1) {
|
|
if (cnt == 0 && offset == 0)
|
|
goto oldway;
|
|
|
|
goto data_err;
|
|
}
|
|
|
|
/*
|
|
* We hit the EOF prematurely.
|
|
* Perhaps the file was externally truncated.
|
|
*/
|
|
if (cnt == 0) {
|
|
msg = "Transfer finished due to "
|
|
"premature end of file.";
|
|
break;
|
|
}
|
|
}
|
|
|
|
transflag = 0;
|
|
reply(226, msg);
|
|
return (0);
|
|
}
|
|
|
|
oldway:
|
|
if ((buf = malloc(blksize)) == NULL) {
|
|
transflag = 0;
|
|
perror_reply(451, "Local resource failure: malloc");
|
|
return (-1);
|
|
}
|
|
|
|
while ((cnt = read(filefd, buf, blksize)) > 0 &&
|
|
write(netfd, buf, cnt) == cnt)
|
|
byte_count += cnt;
|
|
transflag = 0;
|
|
(void)free(buf);
|
|
if (cnt != 0) {
|
|
if (cnt < 0)
|
|
goto file_err;
|
|
goto data_err;
|
|
}
|
|
reply(226, "Transfer complete.");
|
|
return (0);
|
|
default:
|
|
transflag = 0;
|
|
reply(550, "Unimplemented TYPE %d in send_data", type);
|
|
return (-1);
|
|
}
|
|
|
|
data_err:
|
|
transflag = 0;
|
|
perror_reply(426, "Data connection");
|
|
return (-1);
|
|
|
|
file_err:
|
|
transflag = 0;
|
|
perror_reply(551, "Error on input file");
|
|
return (-1);
|
|
|
|
got_oob:
|
|
myoob();
|
|
recvurg = 0;
|
|
transflag = 0;
|
|
return (-1);
|
|
}
|
|
|
|
/*
|
|
* Transfer data from peer to "outstr" using the appropriate encapulation of
|
|
* the data subject to Mode, Structure, and Type.
|
|
*
|
|
* N.B.: Form isn't handled.
|
|
*/
|
|
static int
|
|
receive_data(FILE *instr, FILE *outstr)
|
|
{
|
|
int c;
|
|
int cnt, bare_lfs;
|
|
char buf[BUFSIZ];
|
|
|
|
transflag++;
|
|
bare_lfs = 0;
|
|
|
|
switch (type) {
|
|
|
|
case TYPE_I:
|
|
case TYPE_L:
|
|
while ((cnt = read(fileno(instr), buf, sizeof(buf))) > 0) {
|
|
if (recvurg)
|
|
goto got_oob;
|
|
if (write(fileno(outstr), buf, cnt) != cnt)
|
|
goto file_err;
|
|
byte_count += cnt;
|
|
}
|
|
if (recvurg)
|
|
goto got_oob;
|
|
if (cnt < 0)
|
|
goto data_err;
|
|
transflag = 0;
|
|
return (0);
|
|
|
|
case TYPE_E:
|
|
reply(553, "TYPE E not implemented.");
|
|
transflag = 0;
|
|
return (-1);
|
|
|
|
case TYPE_A:
|
|
while ((c = getc(instr)) != EOF) {
|
|
if (recvurg)
|
|
goto got_oob;
|
|
byte_count++;
|
|
if (c == '\n')
|
|
bare_lfs++;
|
|
while (c == '\r') {
|
|
if (ferror(outstr))
|
|
goto data_err;
|
|
if ((c = getc(instr)) != '\n') {
|
|
(void) putc ('\r', outstr);
|
|
if (c == '\0' || c == EOF)
|
|
goto contin2;
|
|
}
|
|
}
|
|
(void) putc(c, outstr);
|
|
contin2: ;
|
|
}
|
|
if (recvurg)
|
|
goto got_oob;
|
|
fflush(outstr);
|
|
if (ferror(instr))
|
|
goto data_err;
|
|
if (ferror(outstr))
|
|
goto file_err;
|
|
transflag = 0;
|
|
if (bare_lfs) {
|
|
lreply(226,
|
|
"WARNING! %d bare linefeeds received in ASCII mode",
|
|
bare_lfs);
|
|
(void)printf(" File may not have transferred correctly.\r\n");
|
|
}
|
|
return (0);
|
|
default:
|
|
reply(550, "Unimplemented TYPE %d in receive_data", type);
|
|
transflag = 0;
|
|
return (-1);
|
|
}
|
|
|
|
data_err:
|
|
transflag = 0;
|
|
perror_reply(426, "Data Connection");
|
|
return (-1);
|
|
|
|
file_err:
|
|
transflag = 0;
|
|
perror_reply(452, "Error writing file");
|
|
return (-1);
|
|
|
|
got_oob:
|
|
myoob();
|
|
recvurg = 0;
|
|
transflag = 0;
|
|
return (-1);
|
|
}
|
|
|
|
void
|
|
statfilecmd(char *filename)
|
|
{
|
|
FILE *fin;
|
|
int atstart;
|
|
int c, code;
|
|
char line[LINE_MAX];
|
|
struct stat st;
|
|
|
|
code = lstat(filename, &st) == 0 && S_ISDIR(st.st_mode) ? 212 : 213;
|
|
(void)snprintf(line, sizeof(line), _PATH_LS " -lgA %s", filename);
|
|
fin = ftpd_popen(line, "r");
|
|
lreply(code, "Status of %s:", filename);
|
|
atstart = 1;
|
|
while ((c = getc(fin)) != EOF) {
|
|
if (c == '\n') {
|
|
if (ferror(stdout)){
|
|
perror_reply(421, "control connection");
|
|
(void) ftpd_pclose(fin);
|
|
dologout(1);
|
|
/* NOTREACHED */
|
|
}
|
|
if (ferror(fin)) {
|
|
perror_reply(551, filename);
|
|
(void) ftpd_pclose(fin);
|
|
return;
|
|
}
|
|
(void) putc('\r', stdout);
|
|
}
|
|
/*
|
|
* RFC 959 says neutral text should be prepended before
|
|
* a leading 3-digit number followed by whitespace, but
|
|
* many ftp clients can be confused by any leading digits,
|
|
* as a matter of fact.
|
|
*/
|
|
if (atstart && isdigit(c))
|
|
(void) putc(' ', stdout);
|
|
(void) putc(c, stdout);
|
|
atstart = (c == '\n');
|
|
}
|
|
(void) ftpd_pclose(fin);
|
|
reply(code, "End of status");
|
|
}
|
|
|
|
void
|
|
statcmd(void)
|
|
{
|
|
union sockunion *su;
|
|
u_char *a, *p;
|
|
char hname[NI_MAXHOST];
|
|
int ispassive;
|
|
|
|
if (hostinfo) {
|
|
lreply(211, "%s FTP server status:", hostname);
|
|
printf(" %s\r\n", version);
|
|
} else
|
|
lreply(211, "FTP server status:");
|
|
printf(" Connected to %s", remotehost);
|
|
if (!getnameinfo((struct sockaddr *)&his_addr, his_addr.su_len,
|
|
hname, sizeof(hname) - 1, NULL, 0, NI_NUMERICHOST)) {
|
|
if (strcmp(hname, remotehost) != 0)
|
|
printf(" (%s)", hname);
|
|
}
|
|
printf("\r\n");
|
|
if (logged_in) {
|
|
if (guest)
|
|
printf(" Logged in anonymously\r\n");
|
|
else
|
|
printf(" Logged in as %s\r\n", pw->pw_name);
|
|
} else if (askpasswd)
|
|
printf(" Waiting for password\r\n");
|
|
else
|
|
printf(" Waiting for user name\r\n");
|
|
printf(" TYPE: %s", typenames[type]);
|
|
if (type == TYPE_A || type == TYPE_E)
|
|
printf(", FORM: %s", formnames[form]);
|
|
if (type == TYPE_L)
|
|
#if CHAR_BIT == 8
|
|
printf(" %d", CHAR_BIT);
|
|
#else
|
|
printf(" %d", bytesize); /* need definition! */
|
|
#endif
|
|
printf("; STRUcture: %s; transfer MODE: %s\r\n",
|
|
strunames[stru], modenames[mode]);
|
|
if (data != -1)
|
|
printf(" Data connection open\r\n");
|
|
else if (pdata != -1) {
|
|
ispassive = 1;
|
|
su = &pasv_addr;
|
|
goto printaddr;
|
|
} else if (usedefault == 0) {
|
|
ispassive = 0;
|
|
su = &data_dest;
|
|
printaddr:
|
|
#define UC(b) (((int) b) & 0xff)
|
|
if (epsvall) {
|
|
printf(" EPSV only mode (EPSV ALL)\r\n");
|
|
goto epsvonly;
|
|
}
|
|
|
|
/* PORT/PASV */
|
|
if (su->su_family == AF_INET) {
|
|
a = (u_char *) &su->su_sin.sin_addr;
|
|
p = (u_char *) &su->su_sin.sin_port;
|
|
printf(" %s (%d,%d,%d,%d,%d,%d)\r\n",
|
|
ispassive ? "PASV" : "PORT",
|
|
UC(a[0]), UC(a[1]), UC(a[2]), UC(a[3]),
|
|
UC(p[0]), UC(p[1]));
|
|
}
|
|
|
|
/* LPRT/LPSV */
|
|
{
|
|
int alen, af, i;
|
|
|
|
switch (su->su_family) {
|
|
case AF_INET:
|
|
a = (u_char *) &su->su_sin.sin_addr;
|
|
p = (u_char *) &su->su_sin.sin_port;
|
|
alen = sizeof(su->su_sin.sin_addr);
|
|
af = 4;
|
|
break;
|
|
case AF_INET6:
|
|
a = (u_char *) &su->su_sin6.sin6_addr;
|
|
p = (u_char *) &su->su_sin6.sin6_port;
|
|
alen = sizeof(su->su_sin6.sin6_addr);
|
|
af = 6;
|
|
break;
|
|
default:
|
|
af = 0;
|
|
break;
|
|
}
|
|
if (af) {
|
|
printf(" %s (%d,%d,", ispassive ? "LPSV" : "LPRT",
|
|
af, alen);
|
|
for (i = 0; i < alen; i++)
|
|
printf("%d,", UC(a[i]));
|
|
printf("%d,%d,%d)\r\n", 2, UC(p[0]), UC(p[1]));
|
|
}
|
|
}
|
|
|
|
epsvonly:;
|
|
/* EPRT/EPSV */
|
|
{
|
|
int af;
|
|
|
|
switch (su->su_family) {
|
|
case AF_INET:
|
|
af = 1;
|
|
break;
|
|
case AF_INET6:
|
|
af = 2;
|
|
break;
|
|
default:
|
|
af = 0;
|
|
break;
|
|
}
|
|
if (af) {
|
|
union sockunion tmp;
|
|
|
|
tmp = *su;
|
|
if (tmp.su_family == AF_INET6)
|
|
tmp.su_sin6.sin6_scope_id = 0;
|
|
if (!getnameinfo((struct sockaddr *)&tmp, tmp.su_len,
|
|
hname, sizeof(hname) - 1, NULL, 0,
|
|
NI_NUMERICHOST)) {
|
|
printf(" %s |%d|%s|%d|\r\n",
|
|
ispassive ? "EPSV" : "EPRT",
|
|
af, hname, htons(tmp.su_port));
|
|
}
|
|
}
|
|
}
|
|
#undef UC
|
|
} else
|
|
printf(" No data connection\r\n");
|
|
reply(211, "End of status");
|
|
}
|
|
|
|
void
|
|
fatalerror(char *s)
|
|
{
|
|
|
|
reply(451, "Error in server: %s\n", s);
|
|
reply(221, "Closing connection due to server error.");
|
|
dologout(0);
|
|
/* NOTREACHED */
|
|
}
|
|
|
|
void
|
|
reply(int n, const char *fmt, ...)
|
|
{
|
|
va_list ap;
|
|
|
|
(void)printf("%d ", n);
|
|
va_start(ap, fmt);
|
|
(void)vprintf(fmt, ap);
|
|
va_end(ap);
|
|
(void)printf("\r\n");
|
|
(void)fflush(stdout);
|
|
if (ftpdebug) {
|
|
syslog(LOG_DEBUG, "<--- %d ", n);
|
|
va_start(ap, fmt);
|
|
vsyslog(LOG_DEBUG, fmt, ap);
|
|
va_end(ap);
|
|
}
|
|
}
|
|
|
|
void
|
|
lreply(int n, const char *fmt, ...)
|
|
{
|
|
va_list ap;
|
|
|
|
(void)printf("%d- ", n);
|
|
va_start(ap, fmt);
|
|
(void)vprintf(fmt, ap);
|
|
va_end(ap);
|
|
(void)printf("\r\n");
|
|
(void)fflush(stdout);
|
|
if (ftpdebug) {
|
|
syslog(LOG_DEBUG, "<--- %d- ", n);
|
|
va_start(ap, fmt);
|
|
vsyslog(LOG_DEBUG, 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
|
|
delete(char *name)
|
|
{
|
|
struct stat st;
|
|
|
|
LOGCMD("delete", name);
|
|
if (lstat(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 (guest && noguestmod) {
|
|
reply(550, "Operation not permitted");
|
|
return;
|
|
}
|
|
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)
|
|
{
|
|
char *s;
|
|
|
|
LOGCMD("mkdir", name);
|
|
if (guest && noguestmkd)
|
|
reply(550, "%s: permission denied", name);
|
|
else if (mkdir(name, 0777) < 0)
|
|
perror_reply(550, name);
|
|
else {
|
|
if ((s = doublequote(name)) == NULL)
|
|
fatalerror("Ran out of memory.");
|
|
reply(257, "\"%s\" directory created.", s);
|
|
free(s);
|
|
}
|
|
}
|
|
|
|
void
|
|
removedir(char *name)
|
|
{
|
|
|
|
LOGCMD("rmdir", name);
|
|
if (rmdir(name) < 0)
|
|
perror_reply(550, name);
|
|
else
|
|
ack("RMD");
|
|
}
|
|
|
|
void
|
|
pwd(void)
|
|
{
|
|
char *s, path[MAXPATHLEN + 1];
|
|
|
|
if (getwd(path) == (char *)NULL)
|
|
reply(550, "%s.", path);
|
|
else {
|
|
if ((s = doublequote(path)) == NULL)
|
|
fatalerror("Ran out of memory.");
|
|
reply(257, "\"%s\" is current directory.", s);
|
|
free(s);
|
|
}
|
|
}
|
|
|
|
char *
|
|
renamefrom(char *name)
|
|
{
|
|
struct stat st;
|
|
|
|
if (guest && noguestmod) {
|
|
reply(550, "Operation not permitted");
|
|
return (NULL);
|
|
}
|
|
if (lstat(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)
|
|
{
|
|
struct stat st;
|
|
|
|
LOGCMD2("rename", from, to);
|
|
|
|
if (guest && (stat(to, &st) == 0)) {
|
|
reply(550, "%s: permission denied", to);
|
|
return;
|
|
}
|
|
|
|
if (rename(from, to) < 0)
|
|
perror_reply(550, "rename");
|
|
else
|
|
ack("RNTO");
|
|
}
|
|
|
|
static void
|
|
dolog(struct sockaddr *who)
|
|
{
|
|
int error;
|
|
|
|
realhostname_sa(remotehost, sizeof(remotehost) - 1, who, who->sa_len);
|
|
|
|
#ifdef SETPROCTITLE
|
|
#ifdef VIRTUAL_HOSTING
|
|
if (thishost != firsthost)
|
|
snprintf(proctitle, sizeof(proctitle), "%s: connected (to %s)",
|
|
remotehost, hostname);
|
|
else
|
|
#endif
|
|
snprintf(proctitle, sizeof(proctitle), "%s: connected",
|
|
remotehost);
|
|
setproctitle("%s", proctitle);
|
|
#endif /* SETPROCTITLE */
|
|
|
|
if (logging) {
|
|
#ifdef VIRTUAL_HOSTING
|
|
if (thishost != firsthost)
|
|
syslog(LOG_INFO, "connection from %s (to %s)",
|
|
remotehost, hostname);
|
|
else
|
|
#endif
|
|
{
|
|
char who_name[MAXHOSTNAMELEN];
|
|
|
|
error = getnameinfo(who, who->sa_len,
|
|
who_name, sizeof(who_name) - 1,
|
|
NULL, 0, NI_NUMERICHOST);
|
|
syslog(LOG_INFO, "connection from %s (%s)", remotehost,
|
|
error == 0 ? who_name : "");
|
|
}
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Record logout in wtmp file
|
|
* and exit with supplied status.
|
|
*/
|
|
void
|
|
dologout(int status)
|
|
{
|
|
/*
|
|
* Prevent reception of SIGURG from resulting in a resumption
|
|
* back to the main program loop.
|
|
*/
|
|
transflag = 0;
|
|
|
|
if (logged_in && dowtmp) {
|
|
(void) seteuid(0);
|
|
ftpd_logwtmp(ttyline, "", NULL);
|
|
}
|
|
/* beware of flushing buffers after a SIGPIPE */
|
|
_exit(status);
|
|
}
|
|
|
|
static void
|
|
sigurg(int signo)
|
|
{
|
|
|
|
recvurg = 1;
|
|
}
|
|
|
|
static void
|
|
myoob(void)
|
|
{
|
|
char *cp;
|
|
|
|
/* only process if transfer occurring */
|
|
if (!transflag)
|
|
return;
|
|
cp = tmpline;
|
|
if (getline(cp, 7, stdin) == NULL) {
|
|
reply(221, "You could at least say goodbye.");
|
|
dologout(0);
|
|
}
|
|
upper(cp);
|
|
if (strcmp(cp, "ABOR\r\n") == 0) {
|
|
tmpline[0] = '\0';
|
|
reply(426, "Transfer aborted. Data connection closed.");
|
|
reply(226, "Abort successful");
|
|
}
|
|
if (strcmp(cp, "STAT\r\n") == 0) {
|
|
tmpline[0] = '\0';
|
|
if (file_size != -1)
|
|
reply(213, "Status: %jd of %jd bytes transferred",
|
|
(intmax_t)byte_count, (intmax_t)file_size);
|
|
else
|
|
reply(213, "Status: %jd bytes transferred",
|
|
(intmax_t)byte_count);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Note: a response of 425 is not mentioned as a possible response to
|
|
* the PASV command in RFC959. However, it has been blessed as
|
|
* a legitimate response by Jon Postel in a telephone conversation
|
|
* with Rick Adams on 25 Jan 89.
|
|
*/
|
|
void
|
|
passive(void)
|
|
{
|
|
int len, on;
|
|
char *p, *a;
|
|
|
|
if (pdata >= 0) /* close old port if one set */
|
|
close(pdata);
|
|
|
|
pdata = socket(ctrl_addr.su_family, SOCK_STREAM, 0);
|
|
if (pdata < 0) {
|
|
perror_reply(425, "Can't open passive connection");
|
|
return;
|
|
}
|
|
on = 1;
|
|
if (setsockopt(pdata, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on)) < 0)
|
|
syslog(LOG_WARNING, "pdata setsockopt (SO_REUSEADDR): %m");
|
|
|
|
(void) seteuid(0);
|
|
|
|
#ifdef IP_PORTRANGE
|
|
if (ctrl_addr.su_family == AF_INET) {
|
|
on = restricted_data_ports ? IP_PORTRANGE_HIGH
|
|
: IP_PORTRANGE_DEFAULT;
|
|
|
|
if (setsockopt(pdata, IPPROTO_IP, IP_PORTRANGE,
|
|
&on, sizeof(on)) < 0)
|
|
goto pasv_error;
|
|
}
|
|
#endif
|
|
#ifdef IPV6_PORTRANGE
|
|
if (ctrl_addr.su_family == AF_INET6) {
|
|
on = restricted_data_ports ? IPV6_PORTRANGE_HIGH
|
|
: IPV6_PORTRANGE_DEFAULT;
|
|
|
|
if (setsockopt(pdata, IPPROTO_IPV6, IPV6_PORTRANGE,
|
|
&on, sizeof(on)) < 0)
|
|
goto pasv_error;
|
|
}
|
|
#endif
|
|
|
|
pasv_addr = ctrl_addr;
|
|
pasv_addr.su_port = 0;
|
|
if (bind(pdata, (struct sockaddr *)&pasv_addr, pasv_addr.su_len) < 0)
|
|
goto pasv_error;
|
|
|
|
(void) seteuid(pw->pw_uid);
|
|
|
|
len = sizeof(pasv_addr);
|
|
if (getsockname(pdata, (struct sockaddr *) &pasv_addr, &len) < 0)
|
|
goto pasv_error;
|
|
if (listen(pdata, 1) < 0)
|
|
goto pasv_error;
|
|
if (pasv_addr.su_family == AF_INET)
|
|
a = (char *) &pasv_addr.su_sin.sin_addr;
|
|
else if (pasv_addr.su_family == AF_INET6 &&
|
|
IN6_IS_ADDR_V4MAPPED(&pasv_addr.su_sin6.sin6_addr))
|
|
a = (char *) &pasv_addr.su_sin6.sin6_addr.s6_addr[12];
|
|
else
|
|
goto pasv_error;
|
|
|
|
p = (char *) &pasv_addr.su_port;
|
|
|
|
#define UC(b) (((int) b) & 0xff)
|
|
|
|
reply(227, "Entering Passive Mode (%d,%d,%d,%d,%d,%d)", UC(a[0]),
|
|
UC(a[1]), UC(a[2]), UC(a[3]), UC(p[0]), UC(p[1]));
|
|
return;
|
|
|
|
pasv_error:
|
|
(void) seteuid(pw->pw_uid);
|
|
(void) close(pdata);
|
|
pdata = -1;
|
|
perror_reply(425, "Can't open passive connection");
|
|
return;
|
|
}
|
|
|
|
/*
|
|
* Long Passive defined in RFC 1639.
|
|
* 228 Entering Long Passive Mode
|
|
* (af, hal, h1, h2, h3,..., pal, p1, p2...)
|
|
*/
|
|
|
|
void
|
|
long_passive(char *cmd, int pf)
|
|
{
|
|
int len, on;
|
|
char *p, *a;
|
|
|
|
if (pdata >= 0) /* close old port if one set */
|
|
close(pdata);
|
|
|
|
if (pf != PF_UNSPEC) {
|
|
if (ctrl_addr.su_family != pf) {
|
|
switch (ctrl_addr.su_family) {
|
|
case AF_INET:
|
|
pf = 1;
|
|
break;
|
|
case AF_INET6:
|
|
pf = 2;
|
|
break;
|
|
default:
|
|
pf = 0;
|
|
break;
|
|
}
|
|
/*
|
|
* XXX
|
|
* only EPRT/EPSV ready clients will understand this
|
|
*/
|
|
if (strcmp(cmd, "EPSV") == 0 && pf) {
|
|
reply(522, "Network protocol mismatch, "
|
|
"use (%d)", pf);
|
|
} else
|
|
reply(501, "Network protocol mismatch"); /*XXX*/
|
|
|
|
return;
|
|
}
|
|
}
|
|
|
|
pdata = socket(ctrl_addr.su_family, SOCK_STREAM, 0);
|
|
if (pdata < 0) {
|
|
perror_reply(425, "Can't open passive connection");
|
|
return;
|
|
}
|
|
on = 1;
|
|
if (setsockopt(pdata, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on)) < 0)
|
|
syslog(LOG_WARNING, "pdata setsockopt (SO_REUSEADDR): %m");
|
|
|
|
(void) seteuid(0);
|
|
|
|
pasv_addr = ctrl_addr;
|
|
pasv_addr.su_port = 0;
|
|
len = pasv_addr.su_len;
|
|
|
|
#ifdef IP_PORTRANGE
|
|
if (ctrl_addr.su_family == AF_INET) {
|
|
on = restricted_data_ports ? IP_PORTRANGE_HIGH
|
|
: IP_PORTRANGE_DEFAULT;
|
|
|
|
if (setsockopt(pdata, IPPROTO_IP, IP_PORTRANGE,
|
|
&on, sizeof(on)) < 0)
|
|
goto pasv_error;
|
|
}
|
|
#endif
|
|
#ifdef IPV6_PORTRANGE
|
|
if (ctrl_addr.su_family == AF_INET6) {
|
|
on = restricted_data_ports ? IPV6_PORTRANGE_HIGH
|
|
: IPV6_PORTRANGE_DEFAULT;
|
|
|
|
if (setsockopt(pdata, IPPROTO_IPV6, IPV6_PORTRANGE,
|
|
&on, sizeof(on)) < 0)
|
|
goto pasv_error;
|
|
}
|
|
#endif
|
|
|
|
if (bind(pdata, (struct sockaddr *)&pasv_addr, len) < 0)
|
|
goto pasv_error;
|
|
|
|
(void) seteuid(pw->pw_uid);
|
|
|
|
if (getsockname(pdata, (struct sockaddr *) &pasv_addr, &len) < 0)
|
|
goto pasv_error;
|
|
if (listen(pdata, 1) < 0)
|
|
goto pasv_error;
|
|
|
|
#define UC(b) (((int) b) & 0xff)
|
|
|
|
if (strcmp(cmd, "LPSV") == 0) {
|
|
p = (char *)&pasv_addr.su_port;
|
|
switch (pasv_addr.su_family) {
|
|
case AF_INET:
|
|
a = (char *) &pasv_addr.su_sin.sin_addr;
|
|
v4_reply:
|
|
reply(228,
|
|
"Entering Long Passive Mode (%d,%d,%d,%d,%d,%d,%d,%d,%d)",
|
|
4, 4, UC(a[0]), UC(a[1]), UC(a[2]), UC(a[3]),
|
|
2, UC(p[0]), UC(p[1]));
|
|
return;
|
|
case AF_INET6:
|
|
if (IN6_IS_ADDR_V4MAPPED(&pasv_addr.su_sin6.sin6_addr)) {
|
|
a = (char *) &pasv_addr.su_sin6.sin6_addr.s6_addr[12];
|
|
goto v4_reply;
|
|
}
|
|
a = (char *) &pasv_addr.su_sin6.sin6_addr;
|
|
reply(228,
|
|
"Entering Long Passive Mode "
|
|
"(%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d)",
|
|
6, 16, UC(a[0]), UC(a[1]), UC(a[2]), UC(a[3]),
|
|
UC(a[4]), UC(a[5]), UC(a[6]), UC(a[7]),
|
|
UC(a[8]), UC(a[9]), UC(a[10]), UC(a[11]),
|
|
UC(a[12]), UC(a[13]), UC(a[14]), UC(a[15]),
|
|
2, UC(p[0]), UC(p[1]));
|
|
return;
|
|
}
|
|
} else if (strcmp(cmd, "EPSV") == 0) {
|
|
switch (pasv_addr.su_family) {
|
|
case AF_INET:
|
|
case AF_INET6:
|
|
reply(229, "Entering Extended Passive Mode (|||%d|)",
|
|
ntohs(pasv_addr.su_port));
|
|
return;
|
|
}
|
|
} else {
|
|
/* more proper error code? */
|
|
}
|
|
|
|
pasv_error:
|
|
(void) seteuid(pw->pw_uid);
|
|
(void) close(pdata);
|
|
pdata = -1;
|
|
perror_reply(425, "Can't open passive connection");
|
|
return;
|
|
}
|
|
|
|
/*
|
|
* Generate unique name for file with basename "local"
|
|
* and open the file in order to avoid possible races.
|
|
* Try "local" first, then "local.1", "local.2" etc, up to "local.99".
|
|
* Return descriptor to the file, set "name" to its name.
|
|
*
|
|
* Generates failure reply on error.
|
|
*/
|
|
static int
|
|
guniquefd(char *local, char **name)
|
|
{
|
|
static char new[MAXPATHLEN];
|
|
struct stat st;
|
|
char *cp;
|
|
int count;
|
|
int fd;
|
|
|
|
cp = strrchr(local, '/');
|
|
if (cp)
|
|
*cp = '\0';
|
|
if (stat(cp ? local : ".", &st) < 0) {
|
|
perror_reply(553, cp ? local : ".");
|
|
return (-1);
|
|
}
|
|
if (cp) {
|
|
/*
|
|
* Let not overwrite dirname with counter suffix.
|
|
* -4 is for /nn\0
|
|
* In this extreme case dot won't be put in front of suffix.
|
|
*/
|
|
if (strlen(local) > sizeof(new) - 4) {
|
|
reply(553, "Pathname too long");
|
|
return (-1);
|
|
}
|
|
*cp = '/';
|
|
}
|
|
/* -4 is for the .nn<null> we put on the end below */
|
|
(void) snprintf(new, sizeof(new) - 4, "%s", local);
|
|
cp = new + strlen(new);
|
|
/*
|
|
* Don't generate dotfile unless requested explicitly.
|
|
* This covers the case when basename gets truncated off
|
|
* by buffer size.
|
|
*/
|
|
if (cp > new && cp[-1] != '/')
|
|
*cp++ = '.';
|
|
for (count = 0; count < 100; count++) {
|
|
/* At count 0 try unmodified name */
|
|
if (count)
|
|
(void)sprintf(cp, "%d", count);
|
|
if ((fd = open(count ? new : local,
|
|
O_RDWR | O_CREAT | O_EXCL, 0666)) >= 0) {
|
|
*name = count ? new : local;
|
|
return (fd);
|
|
}
|
|
if (errno != EEXIST) {
|
|
perror_reply(553, count ? new : local);
|
|
return (-1);
|
|
}
|
|
}
|
|
reply(452, "Unique file name cannot be created.");
|
|
return (-1);
|
|
}
|
|
|
|
/*
|
|
* 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;
|
|
|
|
if (strpbrk(whichf, "~{[*?") != NULL) {
|
|
int flags = GLOB_BRACE|GLOB_NOCHECK|GLOB_TILDE;
|
|
|
|
memset(&gl, 0, sizeof(gl));
|
|
gl.gl_matchc = MAXGLOBARGS;
|
|
flags |= GLOB_LIMIT;
|
|
freeglob = 1;
|
|
if (glob(whichf, flags, 0, &gl)) {
|
|
reply(550, "not found");
|
|
goto out;
|
|
} else if (gl.gl_pathc == 0) {
|
|
errno = ENOENT;
|
|
perror_reply(550, whichf);
|
|
goto out;
|
|
}
|
|
dirlist = gl.gl_pathv;
|
|
} else {
|
|
onefile[0] = whichf;
|
|
dirlist = onefile;
|
|
simple = 1;
|
|
}
|
|
|
|
while ((dirname = *dirlist++)) {
|
|
if (stat(dirname, &st) < 0) {
|
|
/*
|
|
* If user typed "ls -l", etc, and the client
|
|
* used NLST, do what the user meant.
|
|
*/
|
|
if (dirname[0] == '-' && *dirlist == NULL &&
|
|
transflag == 0) {
|
|
retrieve(_PATH_LS " %s", dirname);
|
|
goto out;
|
|
}
|
|
perror_reply(550, whichf);
|
|
if (dout != NULL) {
|
|
(void) fclose(dout);
|
|
transflag = 0;
|
|
data = -1;
|
|
pdata = -1;
|
|
}
|
|
goto out;
|
|
}
|
|
|
|
if (S_ISREG(st.st_mode)) {
|
|
if (dout == NULL) {
|
|
dout = dataconn("file list", -1, "w");
|
|
if (dout == NULL)
|
|
goto out;
|
|
transflag++;
|
|
}
|
|
fprintf(dout, "%s%s\n", dirname,
|
|
type == TYPE_A ? "\r" : "");
|
|
byte_count += strlen(dirname) + 1;
|
|
continue;
|
|
} else if (!S_ISDIR(st.st_mode))
|
|
continue;
|
|
|
|
if ((dirp = opendir(dirname)) == NULL)
|
|
continue;
|
|
|
|
while ((dir = readdir(dirp)) != NULL) {
|
|
char nbuf[MAXPATHLEN];
|
|
|
|
if (recvurg) {
|
|
myoob();
|
|
recvurg = 0;
|
|
transflag = 0;
|
|
goto out;
|
|
}
|
|
|
|
if (dir->d_name[0] == '.' && dir->d_namlen == 1)
|
|
continue;
|
|
if (dir->d_name[0] == '.' && dir->d_name[1] == '.' &&
|
|
dir->d_namlen == 2)
|
|
continue;
|
|
|
|
snprintf(nbuf, sizeof(nbuf),
|
|
"%s/%s", dirname, dir->d_name);
|
|
|
|
/*
|
|
* We have to do a stat to insure it's
|
|
* not a directory or special file.
|
|
*/
|
|
if (simple || (stat(nbuf, &st) == 0 &&
|
|
S_ISREG(st.st_mode))) {
|
|
if (dout == NULL) {
|
|
dout = dataconn("file list", -1, "w");
|
|
if (dout == NULL)
|
|
goto out;
|
|
transflag++;
|
|
}
|
|
if (nbuf[0] == '.' && nbuf[1] == '/')
|
|
fprintf(dout, "%s%s\n", &nbuf[2],
|
|
type == TYPE_A ? "\r" : "");
|
|
else
|
|
fprintf(dout, "%s%s\n", nbuf,
|
|
type == TYPE_A ? "\r" : "");
|
|
byte_count += strlen(nbuf) + 1;
|
|
}
|
|
}
|
|
(void) closedir(dirp);
|
|
}
|
|
|
|
if (dout == NULL)
|
|
reply(550, "No files found.");
|
|
else if (ferror(dout) != 0)
|
|
perror_reply(550, "Data connection");
|
|
else
|
|
reply(226, "Transfer complete.");
|
|
|
|
transflag = 0;
|
|
if (dout != NULL)
|
|
(void) fclose(dout);
|
|
data = -1;
|
|
pdata = -1;
|
|
out:
|
|
if (freeglob) {
|
|
freeglob = 0;
|
|
globfree(&gl);
|
|
}
|
|
}
|
|
|
|
void
|
|
reapchild(int signo)
|
|
{
|
|
while (wait3(NULL, WNOHANG, NULL) > 0);
|
|
}
|
|
|
|
#ifdef OLD_SETPROCTITLE
|
|
/*
|
|
* Clobber argv so ps will show what we're doing. (Stolen from sendmail.)
|
|
* Warning, since this is usually started from inetd.conf, it often doesn't
|
|
* have much of an environment or arglist to overwrite.
|
|
*/
|
|
void
|
|
setproctitle(const char *fmt, ...)
|
|
{
|
|
int i;
|
|
va_list ap;
|
|
char *p, *bp, ch;
|
|
char buf[LINE_MAX];
|
|
|
|
va_start(ap, fmt);
|
|
(void)vsnprintf(buf, sizeof(buf), fmt, ap);
|
|
|
|
/* make ps print our process name */
|
|
p = Argv[0];
|
|
*p++ = '-';
|
|
|
|
i = strlen(buf);
|
|
if (i > LastArgv - p - 2) {
|
|
i = LastArgv - p - 2;
|
|
buf[i] = '\0';
|
|
}
|
|
bp = buf;
|
|
while (ch = *bp++)
|
|
if (ch != '\n' && ch != '\r')
|
|
*p++ = ch;
|
|
while (p < LastArgv)
|
|
*p++ = ' ';
|
|
}
|
|
#endif /* OLD_SETPROCTITLE */
|
|
|
|
static void
|
|
logxfer(char *name, off_t size, time_t start)
|
|
{
|
|
char buf[MAXPATHLEN + 1024];
|
|
char path[MAXPATHLEN + 1];
|
|
time_t now;
|
|
|
|
if (statfd >= 0) {
|
|
time(&now);
|
|
if (realpath(name, path) == NULL) {
|
|
syslog(LOG_NOTICE, "realpath failed on %s: %m", path);
|
|
return;
|
|
}
|
|
snprintf(buf, sizeof(buf), "%.20s!%s!%s!%s!%jd!%ld\n",
|
|
ctime(&now)+4, ident, remotehost,
|
|
path, (intmax_t)size,
|
|
(long)(now - start + (now == start)));
|
|
write(statfd, buf, strlen(buf));
|
|
}
|
|
}
|
|
|
|
static char *
|
|
doublequote(char *s)
|
|
{
|
|
int n;
|
|
char *p, *s2;
|
|
|
|
for (p = s, n = 0; *p; p++)
|
|
if (*p == '"')
|
|
n++;
|
|
|
|
if ((s2 = malloc(p - s + n + 1)) == NULL)
|
|
return (NULL);
|
|
|
|
for (p = s2; *s; s++, p++) {
|
|
if ((*p = *s) == '"')
|
|
*(++p) = '"';
|
|
}
|
|
*p = '\0';
|
|
|
|
return (s2);
|
|
}
|
|
|
|
/* setup server socket for specified address family */
|
|
/* if af is PF_UNSPEC more than one socket may be returned */
|
|
/* the returned list is dynamically allocated, so caller needs to free it */
|
|
static int *
|
|
socksetup(int af, char *bindname, const char *bindport)
|
|
{
|
|
struct addrinfo hints, *res, *r;
|
|
int error, maxs, *s, *socks;
|
|
const int on = 1;
|
|
|
|
memset(&hints, 0, sizeof(hints));
|
|
hints.ai_flags = AI_PASSIVE;
|
|
hints.ai_family = af;
|
|
hints.ai_socktype = SOCK_STREAM;
|
|
error = getaddrinfo(bindname, bindport, &hints, &res);
|
|
if (error) {
|
|
syslog(LOG_ERR, "%s", gai_strerror(error));
|
|
if (error == EAI_SYSTEM)
|
|
syslog(LOG_ERR, "%s", strerror(errno));
|
|
return NULL;
|
|
}
|
|
|
|
/* Count max number of sockets we may open */
|
|
for (maxs = 0, r = res; r; r = r->ai_next, maxs++)
|
|
;
|
|
socks = malloc((maxs + 1) * sizeof(int));
|
|
if (!socks) {
|
|
freeaddrinfo(res);
|
|
syslog(LOG_ERR, "couldn't allocate memory for sockets");
|
|
return NULL;
|
|
}
|
|
|
|
*socks = 0; /* num of sockets counter at start of array */
|
|
s = socks + 1;
|
|
for (r = res; r; r = r->ai_next) {
|
|
*s = socket(r->ai_family, r->ai_socktype, r->ai_protocol);
|
|
if (*s < 0) {
|
|
syslog(LOG_DEBUG, "control socket: %m");
|
|
continue;
|
|
}
|
|
if (setsockopt(*s, SOL_SOCKET, SO_REUSEADDR,
|
|
&on, sizeof(on)) < 0)
|
|
syslog(LOG_WARNING,
|
|
"control setsockopt (SO_REUSEADDR): %m");
|
|
if (r->ai_family == AF_INET6) {
|
|
if (setsockopt(*s, IPPROTO_IPV6, IPV6_V6ONLY,
|
|
&on, sizeof(on)) < 0)
|
|
syslog(LOG_WARNING,
|
|
"control setsockopt (IPV6_V6ONLY): %m");
|
|
}
|
|
if (bind(*s, r->ai_addr, r->ai_addrlen) < 0) {
|
|
syslog(LOG_DEBUG, "control bind: %m");
|
|
close(*s);
|
|
continue;
|
|
}
|
|
(*socks)++;
|
|
s++;
|
|
}
|
|
|
|
if (res)
|
|
freeaddrinfo(res);
|
|
|
|
if (*socks == 0) {
|
|
syslog(LOG_ERR, "control socket: Couldn't bind to any socket");
|
|
free(socks);
|
|
return NULL;
|
|
}
|
|
return(socks);
|
|
}
|