If PARANOID is set, do not allow PORT commands to remote ports less than 1024
or addresses other than the requestor's address. This violates the FTP protocol (hmm...as I write this, I'm going to change this to a run-time var.) Require login before PASV and RNTO commands. Close unused PASV ports so they don't hang around forever. Do not allow file overwrites via rename or STOR when anonymous (suspenders). Clean up buffer utilization. My code, but heavily inspired by Hobbit's changes to wu-ftpd as pointed out by Mike Prettejohn and Kit Knox.
This commit is contained in:
Paul Traina
parent
7b2dfbf801
commit
61f891a6df
@ -4,7 +4,7 @@ PROG= ftpd
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MAN8= ftpd.8
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SRCS= ftpd.c ftpcmd.c logwtmp.c popen.c skey-stuff.c
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CFLAGS+=-DSETPROCTITLE -DSKEY -DSTATS
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CFLAGS+=-DSETPROCTITLE -DSKEY -DSTATS -DPARANOID
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LDADD= -lskey -lmd -lcrypt -lutil
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DPADD= ${LIBSKEY} ${LIBMD} ${LIBCRYPT} ${LIBUTIL}
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@ -65,3 +65,7 @@ void store __P((char *, char *, int));
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void upper __P((char *));
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void user __P((char *));
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void yyerror __P((char *));
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int yyparse __P((void));
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#if defined(SKEY) && defined(_PWD_H_) /* XXX evil */
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char *skey_challenge __P((char *, struct passwd *, int));
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#endif
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@ -67,7 +67,7 @@ static char sccsid[] = "@(#)ftpcmd.y 8.3 (Berkeley) 4/6/94";
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#include "extern.h"
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extern struct sockaddr_in data_dest;
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extern struct sockaddr_in data_dest, his_addr;
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extern int logged_in;
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extern struct passwd *pw;
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extern int guest;
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@ -149,18 +149,35 @@ cmd
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pass($3);
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free($3);
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}
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| PORT SP host_port CRLF
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| PORT check_login SP host_port CRLF
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{
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usedefault = 0;
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if (pdata >= 0) {
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(void) close(pdata);
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pdata = -1;
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if ($2) {
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#ifdef PARANOID
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if ((ntohs(data_dest.sin_port) <
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IPPORT_RESERVED) ||
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memcmp(&data_dest.sin_addr,
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&his_addr.sin_addr,
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sizeof(data_dest.sin_addr)))
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{
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usedefault = 1;
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reply(500,
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"Illegal PORT range rejected.");
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} else
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#endif
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{
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usedefault = 0;
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if (pdata >= 0) {
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(void) close(pdata);
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pdata = -1;
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}
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reply(200, "PORT command successful.");
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}
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}
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reply(200, "PORT command successful.");
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}
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| PASV CRLF
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| PASV check_login CRLF
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{
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passive();
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if ($2)
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passive();
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}
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| TYPE SP type_code CRLF
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{
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@ -292,16 +309,18 @@ cmd
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if ($4 != NULL)
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free($4);
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}
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| RNTO SP pathname CRLF
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| RNTO check_login SP pathname CRLF
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{
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if (fromname) {
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renamecmd(fromname, $3);
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free(fromname);
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fromname = (char *) 0;
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} else {
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reply(503, "Bad sequence of commands.");
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if ($2) {
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if (fromname) {
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renamecmd(fromname, $4);
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free(fromname);
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fromname = (char *) 0;
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} else {
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reply(503, "Bad sequence of commands.");
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}
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}
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free($3);
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free($4);
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}
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| ABOR CRLF
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{
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@ -30,7 +30,7 @@
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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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* $Id: ftpd.c,v 1.16 1996/04/11 10:22:16 davidg Exp $
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* $Id: ftpd.c,v 1.17 1996/05/31 03:10:25 peter Exp $
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*/
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#ifndef lint
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@ -202,6 +202,9 @@ static struct passwd *
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sgetpwnam __P((char *));
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static char *sgetsave __P((char *));
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static void reapchild __P((int));
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#ifdef STATS
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static void logxfer __P((char *, long, long));
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#endif
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static char *
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curdir()
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@ -380,7 +383,7 @@ main(argc, argv, envp)
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syslog(LOG_ERR, "signal: %m");
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#ifdef SKEY
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strcpy(addr_string, inet_ntoa(his_addr.sin_addr));
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strncpy(addr_string, inet_ntoa(his_addr.sin_addr), sizeof(addr_string));
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#endif
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addrlen = sizeof(ctrl_addr);
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if (getsockname(0, (struct sockaddr *)&ctrl_addr, &addrlen) < 0) {
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@ -739,7 +742,10 @@ pass(passwd)
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if (ident != NULL)
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free(ident);
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ident = (char *) copy(passwd);
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ident = strdup(passwd);
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if (ident == NULL)
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fatal("Ran out of memory.");
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#endif
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reply(230, "Guest login ok, access restrictions apply.");
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#ifdef SETPROCTITLE
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@ -836,7 +842,7 @@ retrieve(cmd, name)
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restart_point == 0 && cmd == 0 && S_ISREG(st.st_mode));
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#ifdef STATS
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if (cmd == 0 && guest && stats)
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logxfer( name, st.st_size, start);
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logxfer(name, st.st_size, start);
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#endif
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(void) fclose(dout);
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data = -1;
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@ -856,7 +862,7 @@ store(name, mode, unique)
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struct stat st;
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int (*closefunc) __P((FILE *));
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if (unique && stat(name, &st) == 0 &&
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if ((unique || guest) && stat(name, &st) == 0 &&
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(name = gunique(name)) == NULL) {
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LOGCMD(*mode == 'w' ? "put" : "append", name);
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return;
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@ -1181,7 +1187,7 @@ receive_data(instr, outstr)
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FILE *instr, *outstr;
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{
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int c;
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int cnt, bare_lfs = 0;
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int cnt, bare_lfs;
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char buf[BUFSIZ];
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transflag++;
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@ -1189,6 +1195,9 @@ receive_data(instr, outstr)
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transflag = 0;
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return (-1);
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}
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bare_lfs = 0;
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switch (type) {
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case TYPE_I:
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@ -1521,8 +1530,15 @@ void
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renamecmd(from, to)
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char *from, *to;
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{
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struct stat st;
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LOGCMD2("rename", from, to);
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if (guest && (stat(to, &st) == 0)) {
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reply(550, "%s: permission denied", to);
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return;
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}
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if (rename(from, to) < 0)
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perror_reply(550, "rename");
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else
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@ -1607,35 +1623,31 @@ void
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passive()
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{
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int len, on;
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u_short port;
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char *p, *a;
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if (pw == NULL) {
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reply(530, "Please login with USER and PASS");
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return;
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}
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if (pdata >= 0) /* close old port if one set */
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close(pdata);
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pdata = socket(AF_INET, SOCK_STREAM, 0);
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if (pdata < 0) {
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perror_reply(425, "Can't open passive connection");
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return;
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}
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on = restricted_data_ports ? IP_PORTRANGE_HIGH : IP_PORTRANGE_DEFAULT;
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(void) seteuid((uid_t)0);
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on = restricted_data_ports ? IP_PORTRANGE_HIGH : IP_PORTRANGE_DEFAULT;
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if (setsockopt(pdata, IPPROTO_IP, IP_PORTRANGE,
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(char *)&on, sizeof(on)) < 0) {
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(void) seteuid((uid_t)pw->pw_uid);
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goto pasv_error;
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}
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pasv_addr = ctrl_addr;
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pasv_addr.sin_port = 0;
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(void) seteuid((uid_t)0);
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if (bind(pdata, (struct sockaddr *)&pasv_addr,
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sizeof(pasv_addr)) < 0) {
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(void) seteuid((uid_t)pw->pw_uid);
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sizeof(pasv_addr)) < 0)
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goto pasv_error;
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}
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(void) seteuid((uid_t)pw->pw_uid);
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len = sizeof(pasv_addr);
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@ -1653,6 +1665,7 @@ passive()
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return;
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pasv_error:
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(void) seteuid((uid_t)pw->pw_uid);
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(void) close(pdata);
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pdata = -1;
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perror_reply(425, "Can't open passive connection");
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@ -1682,7 +1695,7 @@ gunique(local)
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}
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if (cp)
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*cp = '/';
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(void) strcpy(new, local);
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(void) snprintf(new, sizeof(new), "%s", local);
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cp = new + strlen(new);
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*cp++ = '.';
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for (count = 1; count < 100; count++) {
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@ -1894,6 +1907,7 @@ setproctitle(fmt, va_alist)
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#endif /* OLD_SETPROCTITLE */
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#ifdef STATS
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static void
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logxfer(name, size, start)
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char *name;
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long size;
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@ -1905,23 +1919,10 @@ logxfer(name, size, start)
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if (statfd >= 0 && getwd(path) != NULL) {
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time(&now);
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sprintf(buf, "%.20s!%s!%s!%s/%s!%ld!%ld\n",
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snprintf(buf, sizeof(buf), "%.20s!%s!%s!%s/%s!%ld!%ld\n",
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ctime(&now)+4, ident, remotehost,
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path, name, size, now - start + (now == start));
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write(statfd, buf, strlen(buf));
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}
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}
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char *
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copy(s)
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char *s;
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{
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char *p;
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p = malloc((unsigned) strlen(s) + 1);
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if (p == NULL)
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fatal("Ran out of memory.");
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(void) strcpy(p, s);
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return (p);
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}
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#endif
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