[src/netbsd-9]: src/usr.bin/ftp Pull up following revision(s) (requested by l...

[martin <martin%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/d97a52cb90ea
branches:  netbsd-9
changeset: 1002407:d97a52cb90ea
user:      martin <martin%NetBSD.org@localhost>
date:      Sun Oct 24 10:16:05 2021 +0000

description:
Pull up following revision(s) (requested by lukem in ticket #1366):

        usr.bin/ftp/ftp.c: revision 1.173

ftp: validate address from PASV and LPSV response

Fail if the server's response to PASV or LPSV contains an IP address
that doesn't match that of the control connection.
(EPSV already only uses the port portion of the server's response,
per RFC 2428).

Previously a hostile server could cause ftp to open a data connection elsewhere.
Many other ftp implementations have had a similar change for many years,
including those in popular browsers (before they deprecated FTP ...)

Thanks to Simon Josefsson notifying me about
  https://lists.gnu.org/archive/html/bug-inetutils/2021-06/msg00002.html

diffstat:

 usr.bin/ftp/ftp.c |  24 ++++++++++++++++++++++--
 1 files changed, 22 insertions(+), 2 deletions(-)

diffs (59 lines):

diff -r a3517aacc3f2 -r d97a52cb90ea usr.bin/ftp/ftp.c
--- a/usr.bin/ftp/ftp.c Sun Oct 24 10:13:40 2021 +0000
+++ b/usr.bin/ftp/ftp.c Sun Oct 24 10:16:05 2021 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: ftp.c,v 1.168.2.4 2021/06/14 11:45:48 martin Exp $     */
+/*     $NetBSD: ftp.c,v 1.168.2.5 2021/10/24 10:16:05 martin Exp $     */
 
 /*-
  * Copyright (c) 1996-2021 The NetBSD Foundation, Inc.
@@ -92,7 +92,7 @@
 #if 0
 static char sccsid[] = "@(#)ftp.c      8.6 (Berkeley) 10/27/94";
 #else
-__RCSID("$NetBSD: ftp.c,v 1.168.2.4 2021/06/14 11:45:48 martin Exp $");
+__RCSID("$NetBSD: ftp.c,v 1.168.2.5 2021/10/24 10:16:05 martin Exp $");
 #endif
 #endif /* not lint */
 
@@ -1406,6 +1406,12 @@
                        data_addr.si_su.su_sin.sin_addr.s_addr =
                            htonl(pack4(addr, 0));
                        data_addr.su_port = htons(pack2(port, 0));
+                       if (data_addr.si_su.su_sin.sin_addr.s_addr !=
+                           hisctladdr.si_su.su_sin.sin_addr.s_addr) {
+                               fputs("Passive mode address mismatch.\n",
+                                   ttyout);
+                               goto bad;
+                       }
                } else if (strcmp(pasvcmd, "LPSV") == 0) {
                        if (code / 10 == 22 && code != 228) {
                                fputs("wrong server: return code must be 228\n",
@@ -1440,6 +1446,12 @@
                                data_addr.si_su.su_sin.sin_addr.s_addr =
                                    htonl(pack4(addr, 0));
                                data_addr.su_port = htons(pack2(port, 0));
+                               if (data_addr.si_su.su_sin.sin_addr.s_addr !=
+                                   hisctladdr.si_su.su_sin.sin_addr.s_addr) {
+                                       fputs("Passive mode address mismatch.\n",
+                                           ttyout);
+                                       goto bad;
+                               }
                                break;
 #ifdef INET6
                        case AF_INET6:
@@ -1477,6 +1489,14 @@
                                }
                            }
                                data_addr.su_port = htons(pack2(port, 0));
+                               if (memcmp(
+                                   &data_addr.si_su.su_sin6.sin6_addr,
+                                   &hisctladdr.si_su.su_sin6.sin6_addr,
+                                   sizeof(data_addr.si_su.su_sin6.sin6_addr))) {
+                                       fputs("Passive mode address mismatch.\n",
+                                           ttyout);
+                                       goto bad;
+                               }
                                break;
 #endif
                        default: