Adding upstream version 1:9.6p1.upstream/1%9.6p1

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 450 insertions, 0 deletions

diff --git a/ttymodes.c b/ttymodes.c
new file mode 100644
index 0000000..1d20ce8
--- /dev/null
+++ b/ttymodes.c
@@ -0,0 +1,450 @@
+/* $OpenBSD: ttymodes.c,v 1.36 2021/01/27 09:26:54 djm Exp $ */
+/*
+ * Author: Tatu Ylonen <ylo@cs.hut.fi>
+ * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
+ *                    All rights reserved
+ *
+ * As far as I am concerned, the code I have written for this software
+ * can be used freely for any purpose.  Any derived versions of this
+ * software must be clearly marked as such, and if the derived work is
+ * incompatible with the protocol description in the RFC file, it must be
+ * called by a name other than "ssh" or "Secure Shell".
+ */
+
+/*
+ * SSH2 tty modes support by Kevin Steves.
+ * Copyright (c) 2001 Kevin Steves.  All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+/*
+ * Encoding and decoding of terminal modes in a portable way.
+ * Much of the format is defined in ttymodes.h; it is included multiple times
+ * into this file with the appropriate macro definitions to generate the
+ * suitable code.
+ */
+
+#include "includes.h"
+
+#include <sys/types.h>
+
+#include <errno.h>
+#include <string.h>
+#include <termios.h>
+#include <stdarg.h>
+
+#include "packet.h"
+#include "log.h"
+#include "compat.h"
+#include "sshbuf.h"
+#include "ssherr.h"
+
+#define TTY_OP_END		0
+/*
+ * uint32 (u_int) follows speed.
+ */
+#define TTY_OP_ISPEED	128
+#define TTY_OP_OSPEED	129
+
+/*
+ * Converts POSIX speed_t to a baud rate.  The values of the
+ * constants for speed_t are not themselves portable.
+ */
+static int
+speed_to_baud(speed_t speed)
+{
+	switch (speed) {
+	case B0:
+		return 0;
+	case B50:
+		return 50;
+	case B75:
+		return 75;
+	case B110:
+		return 110;
+	case B134:
+		return 134;
+	case B150:
+		return 150;
+	case B200:
+		return 200;
+	case B300:
+		return 300;
+	case B600:
+		return 600;
+	case B1200:
+		return 1200;
+	case B1800:
+		return 1800;
+	case B2400:
+		return 2400;
+	case B4800:
+		return 4800;
+	case B9600:
+		return 9600;
+
+#ifdef B19200
+	case B19200:
+		return 19200;
+#else /* B19200 */
+#ifdef EXTA
+	case EXTA:
+		return 19200;
+#endif /* EXTA */
+#endif /* B19200 */
+
+#ifdef B38400
+	case B38400:
+		return 38400;
+#else /* B38400 */
+#ifdef EXTB
+	case EXTB:
+		return 38400;
+#endif /* EXTB */
+#endif /* B38400 */
+
+#ifdef B7200
+	case B7200:
+		return 7200;
+#endif /* B7200 */
+#ifdef B14400
+	case B14400:
+		return 14400;
+#endif /* B14400 */
+#ifdef B28800
+	case B28800:
+		return 28800;
+#endif /* B28800 */
+#ifdef B57600
+	case B57600:
+		return 57600;
+#endif /* B57600 */
+#ifdef B76800
+	case B76800:
+		return 76800;
+#endif /* B76800 */
+#ifdef B115200
+	case B115200:
+		return 115200;
+#endif /* B115200 */
+#ifdef B230400
+	case B230400:
+		return 230400;
+#endif /* B230400 */
+	default:
+		return 9600;
+	}
+}
+
+/*
+ * Converts a numeric baud rate to a POSIX speed_t.
+ */
+static speed_t
+baud_to_speed(int baud)
+{
+	switch (baud) {
+	case 0:
+		return B0;
+	case 50:
+		return B50;
+	case 75:
+		return B75;
+	case 110:
+		return B110;
+	case 134:
+		return B134;
+	case 150:
+		return B150;
+	case 200:
+		return B200;
+	case 300:
+		return B300;
+	case 600:
+		return B600;
+	case 1200:
+		return B1200;
+	case 1800:
+		return B1800;
+	case 2400:
+		return B2400;
+	case 4800:
+		return B4800;
+	case 9600:
+		return B9600;
+
+#ifdef B19200
+	case 19200:
+		return B19200;
+#else /* B19200 */
+#ifdef EXTA
+	case 19200:
+		return EXTA;
+#endif /* EXTA */
+#endif /* B19200 */
+
+#ifdef B38400
+	case 38400:
+		return B38400;
+#else /* B38400 */
+#ifdef EXTB
+	case 38400:
+		return EXTB;
+#endif /* EXTB */
+#endif /* B38400 */
+
+#ifdef B7200
+	case 7200:
+		return B7200;
+#endif /* B7200 */
+#ifdef B14400
+	case 14400:
+		return B14400;
+#endif /* B14400 */
+#ifdef B28800
+	case 28800:
+		return B28800;
+#endif /* B28800 */
+#ifdef B57600
+	case 57600:
+		return B57600;
+#endif /* B57600 */
+#ifdef B76800
+	case 76800:
+		return B76800;
+#endif /* B76800 */
+#ifdef B115200
+	case 115200:
+		return B115200;
+#endif /* B115200 */
+#ifdef B230400
+	case 230400:
+		return B230400;
+#endif /* B230400 */
+	default:
+		return B9600;
+	}
+}
+
+/*
+ * Encode a special character into SSH line format.
+ */
+static u_int
+special_char_encode(cc_t c)
+{
+#ifdef _POSIX_VDISABLE
+	if (c == _POSIX_VDISABLE)
+		return 255;
+#endif /* _POSIX_VDISABLE */
+	return c;
+}
+
+/*
+ * Decode a special character from SSH line format.
+ */
+static cc_t
+special_char_decode(u_int c)
+{
+#ifdef _POSIX_VDISABLE
+	if (c == 255)
+		return _POSIX_VDISABLE;
+#endif /* _POSIX_VDISABLE */
+	return c;
+}
+
+/*
+ * Encodes terminal modes for the terminal referenced by fd
+ * or tiop in a portable manner, and appends the modes to a packet
+ * being constructed.
+ */
+void
+ssh_tty_make_modes(struct ssh *ssh, int fd, struct termios *tiop)
+{
+	struct termios tio;
+	struct sshbuf *buf;
+	int r, ibaud, obaud;
+
+	if ((buf = sshbuf_new()) == NULL)
+		fatal_f("sshbuf_new failed");
+
+	if (tiop == NULL) {
+		if (fd == -1) {
+			debug_f("no fd or tio");
+			goto end;
+		}
+		if (tcgetattr(fd, &tio) == -1) {
+			logit("tcgetattr: %.100s", strerror(errno));
+			goto end;
+		}
+	} else
+		tio = *tiop;
+
+	/* Store input and output baud rates. */
+	obaud = speed_to_baud(cfgetospeed(&tio));
+	ibaud = speed_to_baud(cfgetispeed(&tio));
+	if ((r = sshbuf_put_u8(buf, TTY_OP_OSPEED)) != 0 ||
+	    (r = sshbuf_put_u32(buf, obaud)) != 0 ||
+	    (r = sshbuf_put_u8(buf, TTY_OP_ISPEED)) != 0 ||
+	    (r = sshbuf_put_u32(buf, ibaud)) != 0)
+		fatal_fr(r, "compose");
+
+	/* Store values of mode flags. */
+#define TTYCHAR(NAME, OP) \
+	if ((r = sshbuf_put_u8(buf, OP)) != 0 || \
+	    (r = sshbuf_put_u32(buf, \
+	    special_char_encode(tio.c_cc[NAME]))) != 0) \
+		fatal_fr(r, "compose %s", #NAME);
+
+#define SSH_TTYMODE_IUTF8 42  /* for SSH_BUG_UTF8TTYMODE */
+
+#define TTYMODE(NAME, FIELD, OP) \
+	if (OP == SSH_TTYMODE_IUTF8 && (ssh->compat & SSH_BUG_UTF8TTYMODE)) { \
+		debug3_f("SSH_BUG_UTF8TTYMODE"); \
+	} else if ((r = sshbuf_put_u8(buf, OP)) != 0 || \
+	    (r = sshbuf_put_u32(buf, ((tio.FIELD & NAME) != 0))) != 0) \
+		fatal_fr(r, "compose %s", #NAME);
+
+#include "ttymodes.h"
+
+#undef TTYCHAR
+#undef TTYMODE
+
+end:
+	/* Mark end of mode data. */
+	if ((r = sshbuf_put_u8(buf, TTY_OP_END)) != 0 ||
+	    (r = sshpkt_put_stringb(ssh, buf)) != 0)
+		fatal_fr(r, "compose end");
+	sshbuf_free(buf);
+}
+
+/*
+ * Decodes terminal modes for the terminal referenced by fd in a portable
+ * manner from a packet being read.
+ */
+void
+ssh_tty_parse_modes(struct ssh *ssh, int fd)
+{
+	struct termios tio;
+	struct sshbuf *buf;
+	const u_char *data;
+	u_char opcode;
+	u_int baud, u;
+	int r, failure = 0;
+	size_t len;
+
+	if ((r = sshpkt_get_string_direct(ssh, &data, &len)) != 0)
+		fatal_fr(r, "parse");
+	if (len == 0)
+		return;
+	if ((buf = sshbuf_from(data, len)) == NULL) {
+		error_f("sshbuf_from failed");
+		return;
+	}
+
+	/*
+	 * Get old attributes for the terminal.  We will modify these
+	 * flags. I am hoping that if there are any machine-specific
+	 * modes, they will initially have reasonable values.
+	 */
+	if (tcgetattr(fd, &tio) == -1) {
+		logit("tcgetattr: %.100s", strerror(errno));
+		failure = -1;
+	}
+
+	while (sshbuf_len(buf) > 0) {
+		if ((r = sshbuf_get_u8(buf, &opcode)) != 0)
+			fatal_fr(r, "parse opcode");
+		switch (opcode) {
+		case TTY_OP_END:
+			goto set;
+
+		case TTY_OP_ISPEED:
+			if ((r = sshbuf_get_u32(buf, &baud)) != 0)
+				fatal_fr(r, "parse ispeed");
+			if (failure != -1 &&
+			    cfsetispeed(&tio, baud_to_speed(baud)) == -1)
+				error("cfsetispeed failed for %d", baud);
+			break;
+
+		case TTY_OP_OSPEED:
+			if ((r = sshbuf_get_u32(buf, &baud)) != 0)
+				fatal_fr(r, "parse ospeed");
+			if (failure != -1 &&
+			    cfsetospeed(&tio, baud_to_speed(baud)) == -1)
+				error("cfsetospeed failed for %d", baud);
+			break;
+
+#define TTYCHAR(NAME, OP) \
+		case OP: \
+			if ((r = sshbuf_get_u32(buf, &u)) != 0) \
+				fatal_fr(r, "parse %s", #NAME); \
+			tio.c_cc[NAME] = special_char_decode(u); \
+			break;
+#define TTYMODE(NAME, FIELD, OP) \
+		case OP: \
+			if ((r = sshbuf_get_u32(buf, &u)) != 0) \
+				fatal_fr(r, "parse %s", #NAME); \
+			if (u) \
+				tio.FIELD |= NAME; \
+			else \
+				tio.FIELD &= ~NAME; \
+			break;
+
+#include "ttymodes.h"
+
+#undef TTYCHAR
+#undef TTYMODE
+
+		default:
+			debug("Ignoring unsupported tty mode opcode %d (0x%x)",
+			    opcode, opcode);
+			/*
+			 * SSH2:
+			 * Opcodes 1 to 159 are defined to have a uint32
+			 * argument.
+			 * Opcodes 160 to 255 are undefined and cause parsing
+			 * to stop.
+			 */
+			if (opcode > 0 && opcode < 160) {
+				if ((r = sshbuf_get_u32(buf, NULL)) != 0)
+					fatal_fr(r, "parse arg");
+				break;
+			} else {
+				logit_f("unknown opcode %d", opcode);
+				goto set;
+			}
+		}
+	}
+
+set:
+	len = sshbuf_len(buf);
+	sshbuf_free(buf);
+	if (len > 0) {
+		logit_f("%zu bytes left", len);
+		return;		/* Don't process bytes passed */
+	}
+	if (failure == -1)
+		return;		/* Packet parsed ok but tcgetattr() failed */
+
+	/* Set the new modes for the terminal. */
+	if (tcsetattr(fd, TCSANOW, &tio) == -1)
+		logit("Setting tty modes failed: %.100s", strerror(errno));
+}