- markus@cvs.openbsd.org 2001/10/07 17:49:40
[channels.c channels.h]
avoid possible FD_ISSET overflow for channels established
during channnel_after_select() (used for dynamic channels).
This commit is contained in:
Damien Miller
parent
058655cced
commit
4623a75462
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@ -21,6 +21,10 @@
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- markus@cvs.openbsd.org 2001/10/07 10:29:52
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[authfile.c]
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grammer; Matthew_Clarke@mindlink.bc.ca
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- markus@cvs.openbsd.org 2001/10/07 17:49:40
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[channels.c channels.h]
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avoid possible FD_ISSET overflow for channels established
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during channnel_after_select() (used for dynamic channels).
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20011007
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- (bal) ssh-copy-id corrected permissions for .ssh/ and authorized_keys.
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@ -6666,4 +6670,4 @@
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- Wrote replacements for strlcpy and mkdtemp
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- Released 1.0pre1
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$Id: ChangeLog,v 1.1591 2001/10/10 05:03:36 djm Exp $
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$Id: ChangeLog,v 1.1592 2001/10/10 05:03:58 djm Exp $
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36
channels.c
36
channels.c
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@ -39,7 +39,7 @@
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*/
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#include "includes.h"
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RCSID("$OpenBSD: channels.c,v 1.136 2001/10/04 15:05:40 markus Exp $");
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RCSID("$OpenBSD: channels.c,v 1.137 2001/10/07 17:49:40 markus Exp $");
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#include "ssh.h"
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#include "ssh1.h"
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@ -241,6 +241,7 @@ channel_new(char *ctype, int type, int rfd, int wfd, int efd,
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}
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/* Initialize and return new channel. */
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c = channels[found] = xmalloc(sizeof(Channel));
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memset(c, 0, sizeof(Channel));
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buffer_init(&c->input);
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buffer_init(&c->output);
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buffer_init(&c->extended);
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@ -974,7 +975,7 @@ channel_pre_dynamic(Channel *c, fd_set * readset, fd_set * writeset)
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int have, ret;
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have = buffer_len(&c->input);
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c->delayed = 0;
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debug2("channel %d: pre_dynamic: have %d", c->self, have);
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/* buffer_dump(&c->input); */
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/* check if the fixed size part of the packet is in buffer. */
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@ -1133,11 +1134,18 @@ channel_post_port_listener(Channel *c, fd_set * readset, fd_set * writeset)
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"to %.100s port %d requested.",
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c->listening_port, c->path, c->host_port);
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rtype = (c->type == SSH_CHANNEL_RPORT_LISTENER) ?
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"forwarded-tcpip" : "direct-tcpip";
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nextstate = (c->host_port == 0 &&
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c->type != SSH_CHANNEL_RPORT_LISTENER) ?
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SSH_CHANNEL_DYNAMIC : SSH_CHANNEL_OPENING;
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if (c->type == SSH_CHANNEL_RPORT_LISTENER) {
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nextstate = SSH_CHANNEL_OPENING;
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rtype = "forwarded-tcpip";
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} else {
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if (c->host_port == 0) {
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nextstate = SSH_CHANNEL_DYNAMIC;
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rtype = "direct-tcpip";
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} else {
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nextstate = SSH_CHANNEL_OPENING;
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rtype = "direct-tcpip";
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}
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}
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addrlen = sizeof(addr);
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newsock = accept(c->sock, &addr, &addrlen);
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@ -1158,8 +1166,16 @@ channel_post_port_listener(Channel *c, fd_set * readset, fd_set * writeset)
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nc->host_port = c->host_port;
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strlcpy(nc->path, c->path, sizeof(nc->path));
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if (nextstate != SSH_CHANNEL_DYNAMIC)
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if (nextstate == SSH_CHANNEL_DYNAMIC) {
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/*
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* do not call the channel_post handler until
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* this flag has been reset by a pre-handler.
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* otherwise the FD_ISSET calls might overflow
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*/
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nc->delayed = 1;
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} else {
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port_open_helper(nc, rtype);
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}
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}
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}
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@ -1409,6 +1425,8 @@ channel_check_window(Channel *c)
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static void
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channel_post_open_1(Channel *c, fd_set * readset, fd_set * writeset)
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{
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if (c->delayed)
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return;
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channel_handle_rfd(c, readset, writeset);
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channel_handle_wfd(c, readset, writeset);
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}
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@ -1416,6 +1434,8 @@ channel_post_open_1(Channel *c, fd_set * readset, fd_set * writeset)
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static void
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channel_post_open_2(Channel *c, fd_set * readset, fd_set * writeset)
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{
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if (c->delayed)
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return;
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channel_handle_rfd(c, readset, writeset);
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channel_handle_wfd(c, readset, writeset);
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channel_handle_efd(c, readset, writeset);
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@ -32,7 +32,7 @@
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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/* RCSID("$OpenBSD: channels.h,v 1.47 2001/10/01 21:38:53 markus Exp $"); */
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/* RCSID("$OpenBSD: channels.h,v 1.48 2001/10/07 17:49:40 markus Exp $"); */
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#ifndef CHANNEL_H
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#define CHANNEL_H
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@ -68,7 +68,6 @@ struct Channel {
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int type; /* channel type/state */
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int self; /* my own channel identifier */
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int remote_id; /* channel identifier for remote peer */
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/* peer can be reached over encrypted connection, via packet-sent */
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int istate; /* input from channel (state of receive half) */
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int ostate; /* output to channel (state of transmit half) */
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int flags; /* close sent/rcvd */
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@ -77,7 +76,8 @@ struct Channel {
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int efd; /* extended fd */
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int sock; /* sock fd */
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int isatty; /* rfd is a tty */
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int force_drain; /* force close on iEOF */
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int force_drain; /* force close on iEOF */
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int delayed; /* fdset hack */
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Buffer input; /* data read from socket, to be sent over
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* encrypted connection */
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Buffer output; /* data received over encrypted connection for
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