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21c06f7ba4
openssh/SOURCES/openssh-8.0p1-restore-nonblock.patch
CentOS Sources 21c06f7ba4 import openssh-8.0p1-10.el8
2021-10-08 14:19:29 +00:00

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diff -up openssh-8.0p1/channels.c.restore-nonblock openssh-8.0p1/channels.c
--- openssh-8.0p1/channels.c.restore-nonblock 2021-06-21 10:44:26.380559612 +0200
+++ openssh-8.0p1/channels.c 2021-06-21 10:48:47.754579151 +0200
@@ -333,7 +333,27 @@ channel_register_fds(struct ssh *ssh, Ch
#endif
/* enable nonblocking mode */
- if (nonblock) {
+ c->restore_block = 0;
+ if (nonblock == CHANNEL_NONBLOCK_STDIO) {
+ /*
+ * Special handling for stdio file descriptors: do not set
+ * non-blocking mode if they are TTYs. Otherwise prepare to
+ * restore their blocking state on exit to avoid interfering
+ * with other programs that follow.
+ */
+ if (rfd != -1 && !isatty(rfd) && fcntl(rfd, F_GETFL) == 0) {
+ c->restore_block |= CHANNEL_RESTORE_RFD;
+ set_nonblock(rfd);
+ }
+ if (wfd != -1 && !isatty(wfd) && fcntl(wfd, F_GETFL) == 0) {
+ c->restore_block |= CHANNEL_RESTORE_WFD;
+ set_nonblock(wfd);
+ }
+ if (efd != -1 && !isatty(efd) && fcntl(efd, F_GETFL) == 0) {
+ c->restore_block |= CHANNEL_RESTORE_EFD;
+ set_nonblock(efd);
+ }
+ } else if (nonblock) {
if (rfd != -1)
set_nonblock(rfd);
if (wfd != -1)
@@ -422,17 +442,23 @@ channel_find_maxfd(struct ssh_channels *
}
int
-channel_close_fd(struct ssh *ssh, int *fdp)
+channel_close_fd(struct ssh *ssh, Channel *c, int *fdp)
{
struct ssh_channels *sc = ssh->chanctxt;
- int ret = 0, fd = *fdp;
+ int ret, fd = *fdp;
- if (fd != -1) {
- ret = close(fd);
- *fdp = -1;
- if (fd == sc->channel_max_fd)
- channel_find_maxfd(sc);
- }
+ if (fd == -1)
+ return 0;
+
+ if ((*fdp == c->rfd && (c->restore_block & CHANNEL_RESTORE_RFD) != 0) ||
+ (*fdp == c->wfd && (c->restore_block & CHANNEL_RESTORE_WFD) != 0) ||
+ (*fdp == c->efd && (c->restore_block & CHANNEL_RESTORE_EFD) != 0))
+ (void)fcntl(*fdp, F_SETFL, 0); /* restore blocking */
+
+ ret = close(fd);
+ *fdp = -1;
+ if (fd == sc->channel_max_fd)
+ channel_find_maxfd(sc);
return ret;
}
@@ -442,13 +468,13 @@ channel_close_fds(struct ssh *ssh, Chann
{
int sock = c->sock, rfd = c->rfd, wfd = c->wfd, efd = c->efd;
- channel_close_fd(ssh, &c->sock);
+ channel_close_fd(ssh, c, &c->sock);
if (rfd != sock)
- channel_close_fd(ssh, &c->rfd);
+ channel_close_fd(ssh, c, &c->rfd);
if (wfd != sock && wfd != rfd)
- channel_close_fd(ssh, &c->wfd);
+ channel_close_fd(ssh, c, &c->wfd);
if (efd != sock && efd != rfd && efd != wfd)
- channel_close_fd(ssh, &c->efd);
+ channel_close_fd(ssh, c, &c->efd);
}
static void
@@ -681,7 +707,7 @@ channel_stop_listening(struct ssh *ssh)
case SSH_CHANNEL_X11_LISTENER:
case SSH_CHANNEL_UNIX_LISTENER:
case SSH_CHANNEL_RUNIX_LISTENER:
- channel_close_fd(ssh, &c->sock);
+ channel_close_fd(ssh, c, &c->sock);
channel_free(ssh, c);
break;
}
@@ -1487,7 +1513,8 @@ channel_decode_socks5(Channel *c, struct
Channel *
channel_connect_stdio_fwd(struct ssh *ssh,
- const char *host_to_connect, u_short port_to_connect, int in, int out)
+ const char *host_to_connect, u_short port_to_connect,
+ int in, int out, int nonblock)
{
Channel *c;
@@ -1495,7 +1522,7 @@ channel_connect_stdio_fwd(struct ssh *ss
c = channel_new(ssh, "stdio-forward", SSH_CHANNEL_OPENING, in, out,
-1, CHAN_TCP_WINDOW_DEFAULT, CHAN_TCP_PACKET_DEFAULT,
- 0, "stdio-forward", /*nonblock*/0);
+ 0, "stdio-forward", nonblock);
c->path = xstrdup(host_to_connect);
c->host_port = port_to_connect;
@@ -1650,7 +1677,7 @@ channel_post_x11_listener(struct ssh *ss
if (c->single_connection) {
oerrno = errno;
debug2("single_connection: closing X11 listener.");
- channel_close_fd(ssh, &c->sock);
+ channel_close_fd(ssh, c, &c->sock);
chan_mark_dead(ssh, c);
errno = oerrno;
}
@@ -2087,7 +2114,7 @@ channel_handle_efd_write(struct ssh *ssh
return 1;
if (len <= 0) {
debug2("channel %d: closing write-efd %d", c->self, c->efd);
- channel_close_fd(ssh, &c->efd);
+ channel_close_fd(ssh, c, &c->efd);
} else {
if ((r = sshbuf_consume(c->extended, len)) != 0) {
fatal("%s: channel %d: consume: %s",
@@ -2119,7 +2146,7 @@ channel_handle_efd_read(struct ssh *ssh,
if (len <= 0) {
debug2("channel %d: closing read-efd %d",
c->self, c->efd);
- channel_close_fd(ssh, &c->efd);
+ channel_close_fd(ssh, c, &c->efd);
} else {
if (c->extended_usage == CHAN_EXTENDED_IGNORE) {
debug3("channel %d: discard efd",
diff -up openssh-8.0p1/channels.h.restore-nonblock openssh-8.0p1/channels.h
--- openssh-8.0p1/channels.h.restore-nonblock 2021-06-21 10:44:26.380559612 +0200
+++ openssh-8.0p1/channels.h 2021-06-21 10:44:26.387559665 +0200
@@ -63,6 +63,16 @@
#define CHANNEL_CANCEL_PORT_STATIC -1
+/* nonblocking flags for channel_new */
+#define CHANNEL_NONBLOCK_LEAVE 0 /* don't modify non-blocking state */
+#define CHANNEL_NONBLOCK_SET 1 /* set non-blocking state */
+#define CHANNEL_NONBLOCK_STDIO 2 /* set non-blocking and restore on close */
+
+/* c->restore_block mask flags */
+#define CHANNEL_RESTORE_RFD 0x01
+#define CHANNEL_RESTORE_WFD 0x02
+#define CHANNEL_RESTORE_EFD 0x04
+
/* TCP forwarding */
#define FORWARD_DENY 0
#define FORWARD_REMOTE (1)
@@ -131,6 +141,7 @@ struct Channel {
* to a matching pre-select handler.
* this way post-select handlers are not
* accidentally called if a FD gets reused */
+ int restore_block; /* fd mask to restore blocking status */
struct sshbuf *input; /* data read from socket, to be sent over
* encrypted connection */
struct sshbuf *output; /* data received over encrypted connection for
@@ -258,7 +269,7 @@ void channel_register_filter(struct ssh
void channel_register_status_confirm(struct ssh *, int,
channel_confirm_cb *, channel_confirm_abandon_cb *, void *);
void channel_cancel_cleanup(struct ssh *, int);
-int channel_close_fd(struct ssh *, int *);
+int channel_close_fd(struct ssh *, Channel *, int *);
void channel_send_window_changes(struct ssh *);
/* mux proxy support */
@@ -305,7 +316,7 @@ Channel *channel_connect_to_port(struct
char *, char *, int *, const char **);
Channel *channel_connect_to_path(struct ssh *, const char *, char *, char *);
Channel *channel_connect_stdio_fwd(struct ssh *, const char*,
- u_short, int, int);
+ u_short, int, int, int);
Channel *channel_connect_by_listen_address(struct ssh *, const char *,
u_short, char *, char *);
Channel *channel_connect_by_listen_path(struct ssh *, const char *,
diff -up openssh-8.0p1/clientloop.c.restore-nonblock openssh-8.0p1/clientloop.c
--- openssh-8.0p1/clientloop.c.restore-nonblock 2021-06-21 10:44:26.290558923 +0200
+++ openssh-8.0p1/clientloop.c 2021-06-21 10:44:26.387559665 +0200
@@ -1436,14 +1436,6 @@ client_loop(struct ssh *ssh, int have_pt
if (have_pty)
leave_raw_mode(options.request_tty == REQUEST_TTY_FORCE);
- /* restore blocking io */
- if (!isatty(fileno(stdin)))
- unset_nonblock(fileno(stdin));
- if (!isatty(fileno(stdout)))
- unset_nonblock(fileno(stdout));
- if (!isatty(fileno(stderr)))
- unset_nonblock(fileno(stderr));
-
/*
* If there was no shell or command requested, there will be no remote
* exit status to be returned. In that case, clear error code if the
diff -up openssh-8.0p1/mux.c.restore-nonblock openssh-8.0p1/mux.c
--- openssh-8.0p1/mux.c.restore-nonblock 2019-04-18 00:52:57.000000000 +0200
+++ openssh-8.0p1/mux.c 2021-06-21 10:50:51.007537336 +0200
@@ -454,14 +454,6 @@ mux_master_process_new_session(struct ss
if (cctx->want_tty && tcgetattr(new_fd[0], &cctx->tio) == -1)
error("%s: tcgetattr: %s", __func__, strerror(errno));
- /* enable nonblocking unless tty */
- if (!isatty(new_fd[0]))
- set_nonblock(new_fd[0]);
- if (!isatty(new_fd[1]))
- set_nonblock(new_fd[1]);
- if (!isatty(new_fd[2]))
- set_nonblock(new_fd[2]);
-
window = CHAN_SES_WINDOW_DEFAULT;
packetmax = CHAN_SES_PACKET_DEFAULT;
if (cctx->want_tty) {
@@ -471,7 +463,7 @@ mux_master_process_new_session(struct ss
nc = channel_new(ssh, "session", SSH_CHANNEL_OPENING,
new_fd[0], new_fd[1], new_fd[2], window, packetmax,
- CHAN_EXTENDED_WRITE, "client-session", /*nonblock*/0);
+ CHAN_EXTENDED_WRITE, "client-session", CHANNEL_NONBLOCK_STDIO);
nc->ctl_chan = c->self; /* link session -> control channel */
c->remote_id = nc->self; /* link control -> session channel */
@@ -1033,13 +1025,8 @@ mux_master_process_stdio_fwd(struct ssh
}
}
- /* enable nonblocking unless tty */
- if (!isatty(new_fd[0]))
- set_nonblock(new_fd[0]);
- if (!isatty(new_fd[1]))
- set_nonblock(new_fd[1]);
-
- nc = channel_connect_stdio_fwd(ssh, chost, cport, new_fd[0], new_fd[1]);
+ nc = channel_connect_stdio_fwd(ssh, chost, cport, new_fd[0], new_fd[1],
+ CHANNEL_NONBLOCK_STDIO);
free(chost);
nc->ctl_chan = c->self; /* link session -> control channel */
diff -up openssh-8.0p1/nchan.c.restore-nonblock openssh-8.0p1/nchan.c
--- openssh-8.0p1/nchan.c.restore-nonblock 2021-06-21 10:44:26.388559673 +0200
+++ openssh-8.0p1/nchan.c 2021-06-21 10:52:42.685405537 +0200
@@ -387,7 +387,7 @@ chan_shutdown_write(struct ssh *ssh, Cha
strerror(errno));
}
} else {
- if (channel_close_fd(ssh, &c->wfd) < 0) {
+ if (channel_close_fd(ssh, c, &c->wfd) < 0) {
logit("channel %d: %s: close() failed for "
"fd %d [i%d o%d]: %.100s",
c->self, __func__, c->wfd, c->istate, c->ostate,
@@ -417,7 +417,7 @@ chan_shutdown_read(struct ssh *ssh, Chan
strerror(errno));
}
} else {
- if (channel_close_fd(ssh, &c->rfd) < 0) {
+ if (channel_close_fd(ssh, c, &c->rfd) < 0) {
logit("channel %d: %s: close() failed for "
"fd %d [i%d o%d]: %.100s",
c->self, __func__, c->rfd, c->istate, c->ostate,
@@ -437,7 +437,7 @@ chan_shutdown_extended_read(struct ssh *
debug2("channel %d: %s (i%d o%d sock %d wfd %d efd %d [%s])",
c->self, __func__, c->istate, c->ostate, c->sock, c->rfd, c->efd,
channel_format_extended_usage(c));
- if (channel_close_fd(ssh, &c->efd) < 0) {
+ if (channel_close_fd(ssh, c, &c->efd) < 0) {
logit("channel %d: %s: close() failed for "
"extended fd %d [i%d o%d]: %.100s",
c->self, __func__, c->efd, c->istate, c->ostate,
diff -up openssh-8.0p1/ssh.c.restore-nonblock openssh-8.0p1/ssh.c
--- openssh-8.0p1/ssh.c.restore-nonblock 2021-06-21 10:44:26.389559681 +0200
+++ openssh-8.0p1/ssh.c 2021-06-21 10:54:47.651377045 +0200
@@ -1709,7 +1709,8 @@ ssh_init_stdio_forwarding(struct ssh *ss
(out = dup(STDOUT_FILENO)) < 0)
fatal("channel_connect_stdio_fwd: dup() in/out failed");
if ((c = channel_connect_stdio_fwd(ssh, options.stdio_forward_host,
- options.stdio_forward_port, in, out)) == NULL)
+ options.stdio_forward_port, in, out,
+ CHANNEL_NONBLOCK_STDIO)) == NULL)
fatal("%s: channel_connect_stdio_fwd failed", __func__);
channel_register_cleanup(ssh, c->self, client_cleanup_stdio_fwd, 0);
channel_register_open_confirm(ssh, c->self, ssh_stdio_confirm, NULL);
@@ -1862,14 +1863,6 @@ ssh_session2_open(struct ssh *ssh)
if (in < 0 || out < 0 || err < 0)
fatal("dup() in/out/err failed");
- /* enable nonblocking unless tty */
- if (!isatty(in))
- set_nonblock(in);
- if (!isatty(out))
- set_nonblock(out);
- if (!isatty(err))
- set_nonblock(err);
-
window = CHAN_SES_WINDOW_DEFAULT;
packetmax = CHAN_SES_PACKET_DEFAULT;
if (tty_flag) {
@@ -1879,7 +1872,7 @@ ssh_session2_open(struct ssh *ssh)
c = channel_new(ssh,
"session", SSH_CHANNEL_OPENING, in, out, err,
window, packetmax, CHAN_EXTENDED_WRITE,
- "client-session", /*nonblock*/0);
+ "client-session", CHANNEL_NONBLOCK_STDIO);
debug3("%s: channel_new: %d", __func__, c->self);
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