dropbear: packet.c annotate

annotate packet.c @ 728:f27058078d61

Try using writev() for writing packets out to tcp

author	Matt Johnston <matt@ucc.asn.au>
date	Sun, 31 Mar 2013 23:15:35 +0800
parents	f4232b65b316
children	9a5438271556

rev	line source
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1 /*
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	2 * Dropbear - a SSH2 server
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	3 *
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	4 * Copyright (c) 2002,2003 Matt Johnston
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	5 * All rights reserved.
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	6 *
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	7 * Permission is hereby granted, free of charge, to any person obtaining a copy
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	8 * of this software and associated documentation files (the "Software"), to deal
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	9 * in the Software without restriction, including without limitation the rights
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	10 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	11 * copies of the Software, and to permit persons to whom the Software is
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	12 * furnished to do so, subject to the following conditions:
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	13 *
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	14 * The above copyright notice and this permission notice shall be included in
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	15 * all copies or substantial portions of the Software.
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	16 *
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	17 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	18 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	19 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	20 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	21 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	22 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	23 * SOFTWARE. */
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	24
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	25 #include "includes.h"
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	26 #include "packet.h"
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	27 #include "session.h"
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	28 #include "dbutil.h"
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	29 #include "ssh.h"
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	30 #include "algo.h"
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	31 #include "buffer.h"
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	32 #include "kex.h"
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	33 #include "random.h"
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	34 #include "service.h"
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	35 #include "auth.h"
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	36 #include "channel.h"
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	37
534 0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf Matt Johnston <matt@ucc.asn.au> parents: 533 diff changeset	38 static int read_packet_init();
0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf Matt Johnston <matt@ucc.asn.au> parents: 533 diff changeset	39 static void make_mac(unsigned int seqno, const struct key_context_directional * key_state,
0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf Matt Johnston <matt@ucc.asn.au> parents: 533 diff changeset	40 buffer * clear_buf, unsigned int clear_len,
0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf Matt Johnston <matt@ucc.asn.au> parents: 533 diff changeset	41 unsigned char *output_mac);
0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf Matt Johnston <matt@ucc.asn.au> parents: 533 diff changeset	42 static int checkmac();
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	43
605 53c21d4ec98a - Don't allow setting memLevel since that doesn't work properly Matt Johnston <matt@ucc.asn.au> parents: 594 diff changeset	44 #define ZLIB_COMPRESS_INCR 100
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	45 #define ZLIB_DECOMPRESS_INCR 100
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	46 #ifndef DISABLE_ZLIB
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	47 static buffer* buf_decompress(buffer* buf, unsigned int len);
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	48 static void buf_compress(buffer * dest, buffer * src, unsigned int len);
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	49 #endif
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	50
531 164b7c2cd5df disapproval of revision 'a101cbd046507cf723e6362a49196dbd4b924042' Matt Johnston <matt@ucc.asn.au> parents: 529 diff changeset	51 /* non-blocking function writing out a current encrypted packet */
164b7c2cd5df disapproval of revision 'a101cbd046507cf723e6362a49196dbd4b924042' Matt Johnston <matt@ucc.asn.au> parents: 529 diff changeset	52 void write_packet() {
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	53
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	54 int len, written;
70 b0316ce64e4b Merging in the changes from 0.41-0.43 main Dropbear tree Matt Johnston <matt@ucc.asn.au> parents: 33 diff changeset	55 buffer * writebuf = NULL;
592 afb089e70892 Don't reset last_packet_time when we're transmitting SSH_MSG_IGNORE packets Matt Johnston <matt@ucc.asn.au> parents: 568 diff changeset	56 time_t now;
afb089e70892 Don't reset last_packet_time when we're transmitting SSH_MSG_IGNORE packets Matt Johnston <matt@ucc.asn.au> parents: 568 diff changeset	57 unsigned packet_type;
728 f27058078d61 Try using writev() for writing packets out to tcp Matt Johnston <matt@ucc.asn.au> parents: 711 diff changeset	58 int all_ignore = 1;
f27058078d61 Try using writev() for writing packets out to tcp Matt Johnston <matt@ucc.asn.au> parents: 711 diff changeset	59 #ifdef HAVE_WRITEV
f27058078d61 Try using writev() for writing packets out to tcp Matt Johnston <matt@ucc.asn.au> parents: 711 diff changeset	60 struct iovec *iov = NULL;
f27058078d61 Try using writev() for writing packets out to tcp Matt Johnston <matt@ucc.asn.au> parents: 711 diff changeset	61 int i;
f27058078d61 Try using writev() for writing packets out to tcp Matt Johnston <matt@ucc.asn.au> parents: 711 diff changeset	62 struct Link *l;
f27058078d61 Try using writev() for writing packets out to tcp Matt Johnston <matt@ucc.asn.au> parents: 711 diff changeset	63 #endif
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	64
165 0cfba3034be5 Fixed DEBUG_TRACE macro so that we don't get semicolons left about the place Matt Johnston <matt@ucc.asn.au> parents: 70 diff changeset	65 TRACE(("enter write_packet"))
531 164b7c2cd5df disapproval of revision 'a101cbd046507cf723e6362a49196dbd4b924042' Matt Johnston <matt@ucc.asn.au> parents: 529 diff changeset	66 dropbear_assert(!isempty(&ses.writequeue));
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	67
728 f27058078d61 Try using writev() for writing packets out to tcp Matt Johnston <matt@ucc.asn.au> parents: 711 diff changeset	68 #ifdef HAVE_WRITEV
f27058078d61 Try using writev() for writing packets out to tcp Matt Johnston <matt@ucc.asn.au> parents: 711 diff changeset	69 iov = m_malloc(sizeof(iov) ses.writequeue.count);
f27058078d61 Try using writev() for writing packets out to tcp Matt Johnston <matt@ucc.asn.au> parents: 711 diff changeset	70 for (l = ses.writequeue.head, i = 0; l; l = l->link, i++)
f27058078d61 Try using writev() for writing packets out to tcp Matt Johnston <matt@ucc.asn.au> parents: 711 diff changeset	71 {
f27058078d61 Try using writev() for writing packets out to tcp Matt Johnston <matt@ucc.asn.au> parents: 711 diff changeset	72 writebuf = (buffer*)l->item;
f27058078d61 Try using writev() for writing packets out to tcp Matt Johnston <matt@ucc.asn.au> parents: 711 diff changeset	73 packet_type = writebuf->data[writebuf->len-1];
f27058078d61 Try using writev() for writing packets out to tcp Matt Johnston <matt@ucc.asn.au> parents: 711 diff changeset	74 len = writebuf->len - 1 - writebuf->pos;
f27058078d61 Try using writev() for writing packets out to tcp Matt Johnston <matt@ucc.asn.au> parents: 711 diff changeset	75 dropbear_assert(len > 0);
f27058078d61 Try using writev() for writing packets out to tcp Matt Johnston <matt@ucc.asn.au> parents: 711 diff changeset	76 all_ignore &= (packet_type == SSH_MSG_IGNORE);
f27058078d61 Try using writev() for writing packets out to tcp Matt Johnston <matt@ucc.asn.au> parents: 711 diff changeset	77 iov[i].iov_base = buf_getptr(writebuf, len);
f27058078d61 Try using writev() for writing packets out to tcp Matt Johnston <matt@ucc.asn.au> parents: 711 diff changeset	78 iov[i].iov_len = len;
f27058078d61 Try using writev() for writing packets out to tcp Matt Johnston <matt@ucc.asn.au> parents: 711 diff changeset	79 }
f27058078d61 Try using writev() for writing packets out to tcp Matt Johnston <matt@ucc.asn.au> parents: 711 diff changeset	80 written = writev(ses.sock_out, iov, ses.writequeue.count);
f27058078d61 Try using writev() for writing packets out to tcp Matt Johnston <matt@ucc.asn.au> parents: 711 diff changeset	81 if (written < 0) {
f27058078d61 Try using writev() for writing packets out to tcp Matt Johnston <matt@ucc.asn.au> parents: 711 diff changeset	82 if (errno == EINTR) {
f27058078d61 Try using writev() for writing packets out to tcp Matt Johnston <matt@ucc.asn.au> parents: 711 diff changeset	83 m_free(iov);
f27058078d61 Try using writev() for writing packets out to tcp Matt Johnston <matt@ucc.asn.au> parents: 711 diff changeset	84 TRACE(("leave writepacket: EINTR"))
f27058078d61 Try using writev() for writing packets out to tcp Matt Johnston <matt@ucc.asn.au> parents: 711 diff changeset	85 return;
f27058078d61 Try using writev() for writing packets out to tcp Matt Johnston <matt@ucc.asn.au> parents: 711 diff changeset	86 } else {
f27058078d61 Try using writev() for writing packets out to tcp Matt Johnston <matt@ucc.asn.au> parents: 711 diff changeset	87 dropbear_exit("Error writing");
f27058078d61 Try using writev() for writing packets out to tcp Matt Johnston <matt@ucc.asn.au> parents: 711 diff changeset	88 }
f27058078d61 Try using writev() for writing packets out to tcp Matt Johnston <matt@ucc.asn.au> parents: 711 diff changeset	89 }
f27058078d61 Try using writev() for writing packets out to tcp Matt Johnston <matt@ucc.asn.au> parents: 711 diff changeset	90
f27058078d61 Try using writev() for writing packets out to tcp Matt Johnston <matt@ucc.asn.au> parents: 711 diff changeset	91 if (written == 0) {
f27058078d61 Try using writev() for writing packets out to tcp Matt Johnston <matt@ucc.asn.au> parents: 711 diff changeset	92 ses.remoteclosed();
f27058078d61 Try using writev() for writing packets out to tcp Matt Johnston <matt@ucc.asn.au> parents: 711 diff changeset	93 }
f27058078d61 Try using writev() for writing packets out to tcp Matt Johnston <matt@ucc.asn.au> parents: 711 diff changeset	94
f27058078d61 Try using writev() for writing packets out to tcp Matt Johnston <matt@ucc.asn.au> parents: 711 diff changeset	95 while (written > 0) {
f27058078d61 Try using writev() for writing packets out to tcp Matt Johnston <matt@ucc.asn.au> parents: 711 diff changeset	96 writebuf = (buffer*)examine(&ses.writequeue);
f27058078d61 Try using writev() for writing packets out to tcp Matt Johnston <matt@ucc.asn.au> parents: 711 diff changeset	97 len = writebuf->len - 1 - writebuf->pos;
f27058078d61 Try using writev() for writing packets out to tcp Matt Johnston <matt@ucc.asn.au> parents: 711 diff changeset	98 if (len > written) {
f27058078d61 Try using writev() for writing packets out to tcp Matt Johnston <matt@ucc.asn.au> parents: 711 diff changeset	99 // partial buffer write
f27058078d61 Try using writev() for writing packets out to tcp Matt Johnston <matt@ucc.asn.au> parents: 711 diff changeset	100 buf_incrpos(writebuf, written);
f27058078d61 Try using writev() for writing packets out to tcp Matt Johnston <matt@ucc.asn.au> parents: 711 diff changeset	101 written = 0;
f27058078d61 Try using writev() for writing packets out to tcp Matt Johnston <matt@ucc.asn.au> parents: 711 diff changeset	102 } else {
f27058078d61 Try using writev() for writing packets out to tcp Matt Johnston <matt@ucc.asn.au> parents: 711 diff changeset	103 written -= len;
f27058078d61 Try using writev() for writing packets out to tcp Matt Johnston <matt@ucc.asn.au> parents: 711 diff changeset	104 dequeue(&ses.writequeue);
f27058078d61 Try using writev() for writing packets out to tcp Matt Johnston <matt@ucc.asn.au> parents: 711 diff changeset	105 buf_free(writebuf);
f27058078d61 Try using writev() for writing packets out to tcp Matt Johnston <matt@ucc.asn.au> parents: 711 diff changeset	106 }
f27058078d61 Try using writev() for writing packets out to tcp Matt Johnston <matt@ucc.asn.au> parents: 711 diff changeset	107 }
f27058078d61 Try using writev() for writing packets out to tcp Matt Johnston <matt@ucc.asn.au> parents: 711 diff changeset	108
f27058078d61 Try using writev() for writing packets out to tcp Matt Johnston <matt@ucc.asn.au> parents: 711 diff changeset	109 m_free(iov);
f27058078d61 Try using writev() for writing packets out to tcp Matt Johnston <matt@ucc.asn.au> parents: 711 diff changeset	110
f27058078d61 Try using writev() for writing packets out to tcp Matt Johnston <matt@ucc.asn.au> parents: 711 diff changeset	111 #else
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	112 /* Get the next buffer in the queue of encrypted packets to write*/
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	113 writebuf = (buffer*)examine(&ses.writequeue);
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	114
592 afb089e70892 Don't reset last_packet_time when we're transmitting SSH_MSG_IGNORE packets Matt Johnston <matt@ucc.asn.au> parents: 568 diff changeset	115 /* The last byte of the buffer is not to be transmitted, but is
afb089e70892 Don't reset last_packet_time when we're transmitting SSH_MSG_IGNORE packets Matt Johnston <matt@ucc.asn.au> parents: 568 diff changeset	116 * a cleartext packet_type indicator */
afb089e70892 Don't reset last_packet_time when we're transmitting SSH_MSG_IGNORE packets Matt Johnston <matt@ucc.asn.au> parents: 568 diff changeset	117 packet_type = writebuf->data[writebuf->len-1];
afb089e70892 Don't reset last_packet_time when we're transmitting SSH_MSG_IGNORE packets Matt Johnston <matt@ucc.asn.au> parents: 568 diff changeset	118 len = writebuf->len - 1 - writebuf->pos;
241 c5d3ef11155f * use own assertions which should get logged properly Matt Johnston <matt@ucc.asn.au> parents: 232 diff changeset	119 dropbear_assert(len > 0);
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	120 /* Try to write as much as possible */
479 e3db1f7a2e43 - Split main socket var into ses.sock_in/ses.sock_out in preparation Matt Johnston <matt@ucc.asn.au> parents: 456 diff changeset	121 written = write(ses.sock_out, buf_getptr(writebuf, len), len);
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	122
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	123 if (written < 0) {
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	124 if (errno == EINTR) {
165 0cfba3034be5 Fixed DEBUG_TRACE macro so that we don't get semicolons left about the place Matt Johnston <matt@ucc.asn.au> parents: 70 diff changeset	125 TRACE(("leave writepacket: EINTR"))
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	126 return;
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	127 } else {
594 a98a2138364a Improve capitalisation for all logged strings Matt Johnston <matt@ucc.asn.au> parents: 592 diff changeset	128 dropbear_exit("Error writing");
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	129 }
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	130 }
728 f27058078d61 Try using writev() for writing packets out to tcp Matt Johnston <matt@ucc.asn.au> parents: 711 diff changeset	131 all_ignore = (packet_type == SSH_MSG_IGNORE);
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	132
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	133 if (written == 0) {
33 f789045062e6 Progressing client support Matt Johnston <matt@ucc.asn.au> parents: 27 diff changeset	134 ses.remoteclosed();
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	135 }
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	136
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	137 if (written == len) {
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	138 /* We've finished with the packet, free it */
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	139 dequeue(&ses.writequeue);
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	140 buf_free(writebuf);
70 b0316ce64e4b Merging in the changes from 0.41-0.43 main Dropbear tree Matt Johnston <matt@ucc.asn.au> parents: 33 diff changeset	141 writebuf = NULL;
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	142 } else {
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	143 /* More packet left to write, leave it in the queue for later */
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	144 buf_incrpos(writebuf, written);
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	145 }
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	146
728 f27058078d61 Try using writev() for writing packets out to tcp Matt Johnston <matt@ucc.asn.au> parents: 711 diff changeset	147 #endif
f27058078d61 Try using writev() for writing packets out to tcp Matt Johnston <matt@ucc.asn.au> parents: 711 diff changeset	148 now = time(NULL);
f27058078d61 Try using writev() for writing packets out to tcp Matt Johnston <matt@ucc.asn.au> parents: 711 diff changeset	149 ses.last_trx_packet_time = now;
f27058078d61 Try using writev() for writing packets out to tcp Matt Johnston <matt@ucc.asn.au> parents: 711 diff changeset	150
f27058078d61 Try using writev() for writing packets out to tcp Matt Johnston <matt@ucc.asn.au> parents: 711 diff changeset	151 if (!all_ignore) {
f27058078d61 Try using writev() for writing packets out to tcp Matt Johnston <matt@ucc.asn.au> parents: 711 diff changeset	152 ses.last_packet_time = now;
f27058078d61 Try using writev() for writing packets out to tcp Matt Johnston <matt@ucc.asn.au> parents: 711 diff changeset	153 }
f27058078d61 Try using writev() for writing packets out to tcp Matt Johnston <matt@ucc.asn.au> parents: 711 diff changeset	154
165 0cfba3034be5 Fixed DEBUG_TRACE macro so that we don't get semicolons left about the place Matt Johnston <matt@ucc.asn.au> parents: 70 diff changeset	155 TRACE(("leave write_packet"))
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	156 }
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	157
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	158 /* Non-blocking function reading available portion of a packet into the
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	159 * ses's buffer, decrypting the length if encrypted, decrypting the
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	160 * full portion if possible */
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	161 void read_packet() {
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	162
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	163 int len;
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	164 unsigned int maxlen;
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	165 unsigned char blocksize;
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	166
165 0cfba3034be5 Fixed DEBUG_TRACE macro so that we don't get semicolons left about the place Matt Johnston <matt@ucc.asn.au> parents: 70 diff changeset	167 TRACE(("enter read_packet"))
534 0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf Matt Johnston <matt@ucc.asn.au> parents: 533 diff changeset	168 blocksize = ses.keys->recv.algo_crypt->blocksize;
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	169
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	170 if (ses.readbuf == NULL \|\| ses.readbuf->len < blocksize) {
534 0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf Matt Johnston <matt@ucc.asn.au> parents: 533 diff changeset	171 int ret;
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	172 /* In the first blocksize of a packet */
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	173
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	174 /* Read the first blocksize of the packet, so we can decrypt it and
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	175 * find the length of the whole packet */
534 0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf Matt Johnston <matt@ucc.asn.au> parents: 533 diff changeset	176 ret = read_packet_init();
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	177
534 0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf Matt Johnston <matt@ucc.asn.au> parents: 533 diff changeset	178 if (ret == DROPBEAR_FAILURE) {
0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf Matt Johnston <matt@ucc.asn.au> parents: 533 diff changeset	179 /* didn't read enough to determine the length */
165 0cfba3034be5 Fixed DEBUG_TRACE macro so that we don't get semicolons left about the place Matt Johnston <matt@ucc.asn.au> parents: 70 diff changeset	180 TRACE(("leave read_packet: packetinit done"))
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	181 return;
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	182 }
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	183 }
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	184
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	185 /* Attempt to read the remainder of the packet, note that there
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	186 * mightn't be any available (EAGAIN) */
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	187 maxlen = ses.readbuf->len - ses.readbuf->pos;
711 f4232b65b316 Fix "-m none" case where an entire packet fits in a block and can be Matt Johnston <matt@ucc.asn.au> parents: 623 diff changeset	188 if (maxlen == 0) {
f4232b65b316 Fix "-m none" case where an entire packet fits in a block and can be Matt Johnston <matt@ucc.asn.au> parents: 623 diff changeset	189 /* Occurs when the packet is only a single block long and has all
f4232b65b316 Fix "-m none" case where an entire packet fits in a block and can be Matt Johnston <matt@ucc.asn.au> parents: 623 diff changeset	190 * been read in read_packet_init(). Usually means that MAC is disabled
f4232b65b316 Fix "-m none" case where an entire packet fits in a block and can be Matt Johnston <matt@ucc.asn.au> parents: 623 diff changeset	191 */
f4232b65b316 Fix "-m none" case where an entire packet fits in a block and can be Matt Johnston <matt@ucc.asn.au> parents: 623 diff changeset	192 len = 0;
f4232b65b316 Fix "-m none" case where an entire packet fits in a block and can be Matt Johnston <matt@ucc.asn.au> parents: 623 diff changeset	193 } else {
f4232b65b316 Fix "-m none" case where an entire packet fits in a block and can be Matt Johnston <matt@ucc.asn.au> parents: 623 diff changeset	194 len = read(ses.sock_in, buf_getptr(ses.readbuf, maxlen), maxlen);
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	195
711 f4232b65b316 Fix "-m none" case where an entire packet fits in a block and can be Matt Johnston <matt@ucc.asn.au> parents: 623 diff changeset	196 if (len == 0) {
f4232b65b316 Fix "-m none" case where an entire packet fits in a block and can be Matt Johnston <matt@ucc.asn.au> parents: 623 diff changeset	197 ses.remoteclosed();
f4232b65b316 Fix "-m none" case where an entire packet fits in a block and can be Matt Johnston <matt@ucc.asn.au> parents: 623 diff changeset	198 }
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	199
711 f4232b65b316 Fix "-m none" case where an entire packet fits in a block and can be Matt Johnston <matt@ucc.asn.au> parents: 623 diff changeset	200 if (len < 0) {
f4232b65b316 Fix "-m none" case where an entire packet fits in a block and can be Matt Johnston <matt@ucc.asn.au> parents: 623 diff changeset	201 if (errno == EINTR \|\| errno == EAGAIN) {
f4232b65b316 Fix "-m none" case where an entire packet fits in a block and can be Matt Johnston <matt@ucc.asn.au> parents: 623 diff changeset	202 TRACE(("leave read_packet: EINTR or EAGAIN"))
f4232b65b316 Fix "-m none" case where an entire packet fits in a block and can be Matt Johnston <matt@ucc.asn.au> parents: 623 diff changeset	203 return;
f4232b65b316 Fix "-m none" case where an entire packet fits in a block and can be Matt Johnston <matt@ucc.asn.au> parents: 623 diff changeset	204 } else {
f4232b65b316 Fix "-m none" case where an entire packet fits in a block and can be Matt Johnston <matt@ucc.asn.au> parents: 623 diff changeset	205 dropbear_exit("Error reading: %s", strerror(errno));
f4232b65b316 Fix "-m none" case where an entire packet fits in a block and can be Matt Johnston <matt@ucc.asn.au> parents: 623 diff changeset	206 }
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	207 }
711 f4232b65b316 Fix "-m none" case where an entire packet fits in a block and can be Matt Johnston <matt@ucc.asn.au> parents: 623 diff changeset	208
f4232b65b316 Fix "-m none" case where an entire packet fits in a block and can be Matt Johnston <matt@ucc.asn.au> parents: 623 diff changeset	209 buf_incrpos(ses.readbuf, len);
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	210 }
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	211
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	212 if ((unsigned int)len == maxlen) {
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	213 /* The whole packet has been read */
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	214 decrypt_packet();
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	215 /* The main select() loop process_packet() to
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	216 * handle the packet contents... */
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	217 }
165 0cfba3034be5 Fixed DEBUG_TRACE macro so that we don't get semicolons left about the place Matt Johnston <matt@ucc.asn.au> parents: 70 diff changeset	218 TRACE(("leave read_packet"))
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	219 }
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	220
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	221 /* Function used to read the initial portion of a packet, and determine the
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	222 * length. Only called during the first BLOCKSIZE of a packet. */
534 0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf Matt Johnston <matt@ucc.asn.au> parents: 533 diff changeset	223 /* Returns DROPBEAR_SUCCESS if the length is determined,
0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf Matt Johnston <matt@ucc.asn.au> parents: 533 diff changeset	224 * DROPBEAR_FAILURE otherwise */
0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf Matt Johnston <matt@ucc.asn.au> parents: 533 diff changeset	225 static int read_packet_init() {
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	226
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	227 unsigned int maxlen;
568 005530560594 Rearrange getaddrstring() etc Matt Johnston <matt@ucc.asn.au> parents: 556 diff changeset	228 int slen;
005530560594 Rearrange getaddrstring() etc Matt Johnston <matt@ucc.asn.au> parents: 556 diff changeset	229 unsigned int len;
005530560594 Rearrange getaddrstring() etc Matt Johnston <matt@ucc.asn.au> parents: 556 diff changeset	230 unsigned int blocksize;
005530560594 Rearrange getaddrstring() etc Matt Johnston <matt@ucc.asn.au> parents: 556 diff changeset	231 unsigned int macsize;
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	232
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	233
534 0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf Matt Johnston <matt@ucc.asn.au> parents: 533 diff changeset	234 blocksize = ses.keys->recv.algo_crypt->blocksize;
0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf Matt Johnston <matt@ucc.asn.au> parents: 533 diff changeset	235 macsize = ses.keys->recv.algo_mac->hashsize;
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	236
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	237 if (ses.readbuf == NULL) {
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	238 /* start of a new packet */
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	239 ses.readbuf = buf_new(INIT_READBUF);
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	240 }
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	241
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	242 maxlen = blocksize - ses.readbuf->pos;
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	243
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	244 /* read the rest of the packet if possible */
568 005530560594 Rearrange getaddrstring() etc Matt Johnston <matt@ucc.asn.au> parents: 556 diff changeset	245 slen = read(ses.sock_in, buf_getwriteptr(ses.readbuf, maxlen),
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	246 maxlen);
568 005530560594 Rearrange getaddrstring() etc Matt Johnston <matt@ucc.asn.au> parents: 556 diff changeset	247 if (slen == 0) {
33 f789045062e6 Progressing client support Matt Johnston <matt@ucc.asn.au> parents: 27 diff changeset	248 ses.remoteclosed();
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	249 }
568 005530560594 Rearrange getaddrstring() etc Matt Johnston <matt@ucc.asn.au> parents: 556 diff changeset	250 if (slen < 0) {
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	251 if (errno == EINTR) {
165 0cfba3034be5 Fixed DEBUG_TRACE macro so that we don't get semicolons left about the place Matt Johnston <matt@ucc.asn.au> parents: 70 diff changeset	252 TRACE(("leave read_packet_init: EINTR"))
534 0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf Matt Johnston <matt@ucc.asn.au> parents: 533 diff changeset	253 return DROPBEAR_FAILURE;
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	254 }
594 a98a2138364a Improve capitalisation for all logged strings Matt Johnston <matt@ucc.asn.au> parents: 592 diff changeset	255 dropbear_exit("Error reading: %s", strerror(errno));
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	256 }
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	257
568 005530560594 Rearrange getaddrstring() etc Matt Johnston <matt@ucc.asn.au> parents: 556 diff changeset	258 buf_incrwritepos(ses.readbuf, slen);
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	259
568 005530560594 Rearrange getaddrstring() etc Matt Johnston <matt@ucc.asn.au> parents: 556 diff changeset	260 if ((unsigned int)slen != maxlen) {
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	261 /* don't have enough bytes to determine length, get next time */
534 0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf Matt Johnston <matt@ucc.asn.au> parents: 533 diff changeset	262 return DROPBEAR_FAILURE;
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	263 }
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	264
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	265 /* now we have the first block, need to get packet length, so we decrypt
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	266 * the first block (only need first 4 bytes) */
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	267 buf_setpos(ses.readbuf, 0);
534 0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf Matt Johnston <matt@ucc.asn.au> parents: 533 diff changeset	268 if (ses.keys->recv.crypt_mode->decrypt(buf_getptr(ses.readbuf, blocksize),
0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf Matt Johnston <matt@ucc.asn.au> parents: 533 diff changeset	269 buf_getwriteptr(ses.readbuf, blocksize),
502 43bbe17d6ba0 - Add Counter Mode support Matt Johnston <matt@ucc.asn.au> parents: 501 diff changeset	270 blocksize,
534 0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf Matt Johnston <matt@ucc.asn.au> parents: 533 diff changeset	271 &ses.keys->recv.cipher_state) != CRYPT_OK) {
594 a98a2138364a Improve capitalisation for all logged strings Matt Johnston <matt@ucc.asn.au> parents: 592 diff changeset	272 dropbear_exit("Error decrypting");
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	273 }
534 0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf Matt Johnston <matt@ucc.asn.au> parents: 533 diff changeset	274 len = buf_getint(ses.readbuf) + 4 + macsize;
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	275
534 0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf Matt Johnston <matt@ucc.asn.au> parents: 533 diff changeset	276 TRACE(("packet size is %d, block %d mac %d", len, blocksize, macsize))
0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf Matt Johnston <matt@ucc.asn.au> parents: 533 diff changeset	277
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	278
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	279 /* check packet length */
448 9c61e7af0156 Rearrange the channel buffer sizes into three neat use-editable values in Matt Johnston <matt@ucc.asn.au> parents: 426 diff changeset	280 if ((len > RECV_MAX_PACKET_LEN) \|\|
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	281 (len < MIN_PACKET_LEN + macsize) \|\|
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	282 ((len - macsize) % blocksize != 0)) {
594 a98a2138364a Improve capitalisation for all logged strings Matt Johnston <matt@ucc.asn.au> parents: 592 diff changeset	283 dropbear_exit("Integrity error (bad packet size %d)", len);
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	284 }
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	285
534 0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf Matt Johnston <matt@ucc.asn.au> parents: 533 diff changeset	286 if (len > ses.readbuf->size) {
0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf Matt Johnston <matt@ucc.asn.au> parents: 533 diff changeset	287 buf_resize(ses.readbuf, len);
0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf Matt Johnston <matt@ucc.asn.au> parents: 533 diff changeset	288 }
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	289 buf_setlen(ses.readbuf, len);
534 0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf Matt Johnston <matt@ucc.asn.au> parents: 533 diff changeset	290 buf_setpos(ses.readbuf, blocksize);
0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf Matt Johnston <matt@ucc.asn.au> parents: 533 diff changeset	291 return DROPBEAR_SUCCESS;
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	292 }
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	293
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	294 /* handle the received packet */
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	295 void decrypt_packet() {
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	296
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	297 unsigned char blocksize;
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	298 unsigned char macsize;
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	299 unsigned int padlen;
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	300 unsigned int len;
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	301
165 0cfba3034be5 Fixed DEBUG_TRACE macro so that we don't get semicolons left about the place Matt Johnston <matt@ucc.asn.au> parents: 70 diff changeset	302 TRACE(("enter decrypt_packet"))
534 0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf Matt Johnston <matt@ucc.asn.au> parents: 533 diff changeset	303 blocksize = ses.keys->recv.algo_crypt->blocksize;
0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf Matt Johnston <matt@ucc.asn.au> parents: 533 diff changeset	304 macsize = ses.keys->recv.algo_mac->hashsize;
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	305
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	306 ses.kexstate.datarecv += ses.readbuf->len;
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	307
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	308 /* we've already decrypted the first blocksize in read_packet_init */
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	309 buf_setpos(ses.readbuf, blocksize);
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	310
534 0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf Matt Johnston <matt@ucc.asn.au> parents: 533 diff changeset	311 /* decrypt it in-place */
528 378a6389f88e - Don't be dumb and encrypt/decrypt in a while() loop - why did I do this?? Matt Johnston <matt@ucc.asn.au> parents: 513 diff changeset	312 len = ses.readbuf->len - macsize - ses.readbuf->pos;
534 0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf Matt Johnston <matt@ucc.asn.au> parents: 533 diff changeset	313 if (ses.keys->recv.crypt_mode->decrypt(
528 378a6389f88e - Don't be dumb and encrypt/decrypt in a while() loop - why did I do this?? Matt Johnston <matt@ucc.asn.au> parents: 513 diff changeset	314 buf_getptr(ses.readbuf, len),
534 0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf Matt Johnston <matt@ucc.asn.au> parents: 533 diff changeset	315 buf_getwriteptr(ses.readbuf, len),
528 378a6389f88e - Don't be dumb and encrypt/decrypt in a while() loop - why did I do this?? Matt Johnston <matt@ucc.asn.au> parents: 513 diff changeset	316 len,
534 0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf Matt Johnston <matt@ucc.asn.au> parents: 533 diff changeset	317 &ses.keys->recv.cipher_state) != CRYPT_OK) {
594 a98a2138364a Improve capitalisation for all logged strings Matt Johnston <matt@ucc.asn.au> parents: 592 diff changeset	318 dropbear_exit("Error decrypting");
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	319 }
528 378a6389f88e - Don't be dumb and encrypt/decrypt in a while() loop - why did I do this?? Matt Johnston <matt@ucc.asn.au> parents: 513 diff changeset	320 buf_incrpos(ses.readbuf, len);
534 0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf Matt Johnston <matt@ucc.asn.au> parents: 533 diff changeset	321
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	322 /* check the hmac */
534 0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf Matt Johnston <matt@ucc.asn.au> parents: 533 diff changeset	323 if (checkmac() != DROPBEAR_SUCCESS) {
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	324 dropbear_exit("Integrity error");
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	325 }
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	326
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	327 /* get padding length */
534 0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf Matt Johnston <matt@ucc.asn.au> parents: 533 diff changeset	328 buf_setpos(ses.readbuf, PACKET_PADDING_OFF);
0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf Matt Johnston <matt@ucc.asn.au> parents: 533 diff changeset	329 padlen = buf_getbyte(ses.readbuf);
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	330
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	331 /* payload length */
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	332 /* - 4 - 1 is for LEN and PADLEN values */
556 ccdc4c6183c0 - Payload length doesn't include macsize. Matt Johnston <matt@ucc.asn.au> parents: 535 diff changeset	333 len = ses.readbuf->len - padlen - 4 - 1 - macsize;
448 9c61e7af0156 Rearrange the channel buffer sizes into three neat use-editable values in Matt Johnston <matt@ucc.asn.au> parents: 426 diff changeset	334 if ((len > RECV_MAX_PAYLOAD_LEN) \|\| (len < 1)) {
594 a98a2138364a Improve capitalisation for all logged strings Matt Johnston <matt@ucc.asn.au> parents: 592 diff changeset	335 dropbear_exit("Bad packet size %d", len);
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	336 }
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	337
534 0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf Matt Johnston <matt@ucc.asn.au> parents: 533 diff changeset	338 buf_setpos(ses.readbuf, PACKET_PAYLOAD_OFF);
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	339
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	340 #ifndef DISABLE_ZLIB
501 d58c478bd399 Add support for [email protected] delayed compression. Matt Johnston <matt@ucc.asn.au> parents: 479 diff changeset	341 if (is_compress_recv()) {
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	342 /* decompress */
534 0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf Matt Johnston <matt@ucc.asn.au> parents: 533 diff changeset	343 ses.payload = buf_decompress(ses.readbuf, len);
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	344 } else
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	345 #endif
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	346 {
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	347 /* copy payload */
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	348 ses.payload = buf_new(len);
534 0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf Matt Johnston <matt@ucc.asn.au> parents: 533 diff changeset	349 memcpy(ses.payload->data, buf_getptr(ses.readbuf, len), len);
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	350 buf_incrlen(ses.payload, len);
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	351 }
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	352
534 0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf Matt Johnston <matt@ucc.asn.au> parents: 533 diff changeset	353 buf_free(ses.readbuf);
0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf Matt Johnston <matt@ucc.asn.au> parents: 533 diff changeset	354 ses.readbuf = NULL;
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	355 buf_setpos(ses.payload, 0);
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	356
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	357 ses.recvseq++;
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	358
165 0cfba3034be5 Fixed DEBUG_TRACE macro so that we don't get semicolons left about the place Matt Johnston <matt@ucc.asn.au> parents: 70 diff changeset	359 TRACE(("leave decrypt_packet"))
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	360 }
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	361
534 0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf Matt Johnston <matt@ucc.asn.au> parents: 533 diff changeset	362 /* Checks the mac at the end of a decrypted readbuf.
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	363 * Returns DROPBEAR_SUCCESS or DROPBEAR_FAILURE */
534 0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf Matt Johnston <matt@ucc.asn.au> parents: 533 diff changeset	364 static int checkmac() {
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	365
534 0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf Matt Johnston <matt@ucc.asn.au> parents: 533 diff changeset	366 unsigned char mac_bytes[MAX_MAC_LEN];
0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf Matt Johnston <matt@ucc.asn.au> parents: 533 diff changeset	367 unsigned int mac_size, contents_len;
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	368
534 0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf Matt Johnston <matt@ucc.asn.au> parents: 533 diff changeset	369 mac_size = ses.keys->trans.algo_mac->hashsize;
0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf Matt Johnston <matt@ucc.asn.au> parents: 533 diff changeset	370 contents_len = ses.readbuf->len - mac_size;
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	371
534 0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf Matt Johnston <matt@ucc.asn.au> parents: 533 diff changeset	372 buf_setpos(ses.readbuf, 0);
0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf Matt Johnston <matt@ucc.asn.au> parents: 533 diff changeset	373 make_mac(ses.recvseq, &ses.keys->recv, ses.readbuf, contents_len, mac_bytes);
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	374
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	375 /* compare the hash */
534 0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf Matt Johnston <matt@ucc.asn.au> parents: 533 diff changeset	376 buf_setpos(ses.readbuf, contents_len);
0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf Matt Johnston <matt@ucc.asn.au> parents: 533 diff changeset	377 if (memcmp(mac_bytes, buf_getptr(ses.readbuf, mac_size), mac_size) != 0) {
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	378 return DROPBEAR_FAILURE;
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	379 } else {
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	380 return DROPBEAR_SUCCESS;
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	381 }
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	382 }
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	383
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	384 #ifndef DISABLE_ZLIB
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	385 /* returns a pointer to a newly created buffer */
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	386 static buffer* buf_decompress(buffer* buf, unsigned int len) {
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	387
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	388 int result;
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	389 buffer * ret;
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	390 z_streamp zstream;
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	391
534 0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf Matt Johnston <matt@ucc.asn.au> parents: 533 diff changeset	392 zstream = ses.keys->recv.zstream;
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	393 ret = buf_new(len);
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	394
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	395 zstream->avail_in = len;
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	396 zstream->next_in = buf_getptr(buf, len);
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	397
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	398 /* decompress the payload, incrementally resizing the output buffer */
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	399 while (1) {
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	400
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	401 zstream->avail_out = ret->size - ret->pos;
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	402 zstream->next_out = buf_getwriteptr(ret, zstream->avail_out);
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	403
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	404 result = inflate(zstream, Z_SYNC_FLUSH);
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	405
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	406 buf_setlen(ret, ret->size - zstream->avail_out);
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	407 buf_setpos(ret, ret->len);
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	408
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	409 if (result != Z_BUF_ERROR && result != Z_OK) {
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	410 dropbear_exit("zlib error");
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	411 }
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	412
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	413 if (zstream->avail_in == 0 &&
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	414 (zstream->avail_out != 0 \|\| result == Z_BUF_ERROR)) {
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	415 /* we can only exit if avail_out hasn't all been used,
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	416 * and there's no remaining input */
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	417 return ret;
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	418 }
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	419
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	420 if (zstream->avail_out == 0) {
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	421 buf_resize(ret, ret->size + ZLIB_DECOMPRESS_INCR);
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	422 }
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	423 }
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	424 }
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	425 #endif
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	426
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	427
452 4cab61369879 Prevent invalid packets being sent during key-exchange, instead queue Matt Johnston <matt@ucc.asn.au> parents: 448 diff changeset	428 /* returns 1 if the packet is a valid type during kex (see 7.1 of rfc4253) */
4cab61369879 Prevent invalid packets being sent during key-exchange, instead queue Matt Johnston <matt@ucc.asn.au> parents: 448 diff changeset	429 static int packet_is_okay_kex(unsigned char type) {
4cab61369879 Prevent invalid packets being sent during key-exchange, instead queue Matt Johnston <matt@ucc.asn.au> parents: 448 diff changeset	430 if (type >= SSH_MSG_USERAUTH_REQUEST) {
4cab61369879 Prevent invalid packets being sent during key-exchange, instead queue Matt Johnston <matt@ucc.asn.au> parents: 448 diff changeset	431 return 0;
4cab61369879 Prevent invalid packets being sent during key-exchange, instead queue Matt Johnston <matt@ucc.asn.au> parents: 448 diff changeset	432 }
4cab61369879 Prevent invalid packets being sent during key-exchange, instead queue Matt Johnston <matt@ucc.asn.au> parents: 448 diff changeset	433 if (type == SSH_MSG_SERVICE_REQUEST \|\| type == SSH_MSG_SERVICE_ACCEPT) {
4cab61369879 Prevent invalid packets being sent during key-exchange, instead queue Matt Johnston <matt@ucc.asn.au> parents: 448 diff changeset	434 return 0;
4cab61369879 Prevent invalid packets being sent during key-exchange, instead queue Matt Johnston <matt@ucc.asn.au> parents: 448 diff changeset	435 }
4cab61369879 Prevent invalid packets being sent during key-exchange, instead queue Matt Johnston <matt@ucc.asn.au> parents: 448 diff changeset	436 if (type == SSH_MSG_KEXINIT) {
4cab61369879 Prevent invalid packets being sent during key-exchange, instead queue Matt Johnston <matt@ucc.asn.au> parents: 448 diff changeset	437 /* XXX should this die horribly if !dataallowed ?? */
4cab61369879 Prevent invalid packets being sent during key-exchange, instead queue Matt Johnston <matt@ucc.asn.au> parents: 448 diff changeset	438 return 0;
4cab61369879 Prevent invalid packets being sent during key-exchange, instead queue Matt Johnston <matt@ucc.asn.au> parents: 448 diff changeset	439 }
4cab61369879 Prevent invalid packets being sent during key-exchange, instead queue Matt Johnston <matt@ucc.asn.au> parents: 448 diff changeset	440 return 1;
4cab61369879 Prevent invalid packets being sent during key-exchange, instead queue Matt Johnston <matt@ucc.asn.au> parents: 448 diff changeset	441 }
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	442
452 4cab61369879 Prevent invalid packets being sent during key-exchange, instead queue Matt Johnston <matt@ucc.asn.au> parents: 448 diff changeset	443 static void enqueue_reply_packet() {
4cab61369879 Prevent invalid packets being sent during key-exchange, instead queue Matt Johnston <matt@ucc.asn.au> parents: 448 diff changeset	444 struct packetlist * new_item = NULL;
4cab61369879 Prevent invalid packets being sent during key-exchange, instead queue Matt Johnston <matt@ucc.asn.au> parents: 448 diff changeset	445 new_item = m_malloc(sizeof(struct packetlist));
4cab61369879 Prevent invalid packets being sent during key-exchange, instead queue Matt Johnston <matt@ucc.asn.au> parents: 448 diff changeset	446 new_item->next = NULL;
4cab61369879 Prevent invalid packets being sent during key-exchange, instead queue Matt Johnston <matt@ucc.asn.au> parents: 448 diff changeset	447
4cab61369879 Prevent invalid packets being sent during key-exchange, instead queue Matt Johnston <matt@ucc.asn.au> parents: 448 diff changeset	448 new_item->payload = buf_newcopy(ses.writepayload);
4cab61369879 Prevent invalid packets being sent during key-exchange, instead queue Matt Johnston <matt@ucc.asn.au> parents: 448 diff changeset	449 buf_setpos(ses.writepayload, 0);
4cab61369879 Prevent invalid packets being sent during key-exchange, instead queue Matt Johnston <matt@ucc.asn.au> parents: 448 diff changeset	450 buf_setlen(ses.writepayload, 0);
4cab61369879 Prevent invalid packets being sent during key-exchange, instead queue Matt Johnston <matt@ucc.asn.au> parents: 448 diff changeset	451
4cab61369879 Prevent invalid packets being sent during key-exchange, instead queue Matt Johnston <matt@ucc.asn.au> parents: 448 diff changeset	452 if (ses.reply_queue_tail) {
4cab61369879 Prevent invalid packets being sent during key-exchange, instead queue Matt Johnston <matt@ucc.asn.au> parents: 448 diff changeset	453 ses.reply_queue_tail->next = new_item;
4cab61369879 Prevent invalid packets being sent during key-exchange, instead queue Matt Johnston <matt@ucc.asn.au> parents: 448 diff changeset	454 } else {
4cab61369879 Prevent invalid packets being sent during key-exchange, instead queue Matt Johnston <matt@ucc.asn.au> parents: 448 diff changeset	455 ses.reply_queue_head = new_item;
4cab61369879 Prevent invalid packets being sent during key-exchange, instead queue Matt Johnston <matt@ucc.asn.au> parents: 448 diff changeset	456 }
456 f6c999ba31da Fix delayed packet queue handling Matt Johnston <matt@ucc.asn.au> parents: 454 diff changeset	457 ses.reply_queue_tail = new_item;
452 4cab61369879 Prevent invalid packets being sent during key-exchange, instead queue Matt Johnston <matt@ucc.asn.au> parents: 448 diff changeset	458 TRACE(("leave enqueue_reply_packet"))
4cab61369879 Prevent invalid packets being sent during key-exchange, instead queue Matt Johnston <matt@ucc.asn.au> parents: 448 diff changeset	459 }
4cab61369879 Prevent invalid packets being sent during key-exchange, instead queue Matt Johnston <matt@ucc.asn.au> parents: 448 diff changeset	460
4cab61369879 Prevent invalid packets being sent during key-exchange, instead queue Matt Johnston <matt@ucc.asn.au> parents: 448 diff changeset	461 void maybe_flush_reply_queue() {
4cab61369879 Prevent invalid packets being sent during key-exchange, instead queue Matt Johnston <matt@ucc.asn.au> parents: 448 diff changeset	462 struct packetlist tmp_item = NULL, curr_item = NULL;
4cab61369879 Prevent invalid packets being sent during key-exchange, instead queue Matt Johnston <matt@ucc.asn.au> parents: 448 diff changeset	463 if (!ses.dataallowed)
4cab61369879 Prevent invalid packets being sent during key-exchange, instead queue Matt Johnston <matt@ucc.asn.au> parents: 448 diff changeset	464 {
4cab61369879 Prevent invalid packets being sent during key-exchange, instead queue Matt Johnston <matt@ucc.asn.au> parents: 448 diff changeset	465 TRACE(("maybe_empty_reply_queue - no data allowed"))
4cab61369879 Prevent invalid packets being sent during key-exchange, instead queue Matt Johnston <matt@ucc.asn.au> parents: 448 diff changeset	466 return;
4cab61369879 Prevent invalid packets being sent during key-exchange, instead queue Matt Johnston <matt@ucc.asn.au> parents: 448 diff changeset	467 }
4cab61369879 Prevent invalid packets being sent during key-exchange, instead queue Matt Johnston <matt@ucc.asn.au> parents: 448 diff changeset	468
4cab61369879 Prevent invalid packets being sent during key-exchange, instead queue Matt Johnston <matt@ucc.asn.au> parents: 448 diff changeset	469 for (curr_item = ses.reply_queue_head; curr_item; ) {
4cab61369879 Prevent invalid packets being sent during key-exchange, instead queue Matt Johnston <matt@ucc.asn.au> parents: 448 diff changeset	470 CHECKCLEARTOWRITE();
4cab61369879 Prevent invalid packets being sent during key-exchange, instead queue Matt Johnston <matt@ucc.asn.au> parents: 448 diff changeset	471 buf_putbytes(ses.writepayload,
4cab61369879 Prevent invalid packets being sent during key-exchange, instead queue Matt Johnston <matt@ucc.asn.au> parents: 448 diff changeset	472 curr_item->payload->data, curr_item->payload->len);
4cab61369879 Prevent invalid packets being sent during key-exchange, instead queue Matt Johnston <matt@ucc.asn.au> parents: 448 diff changeset	473
4cab61369879 Prevent invalid packets being sent during key-exchange, instead queue Matt Johnston <matt@ucc.asn.au> parents: 448 diff changeset	474 buf_free(curr_item->payload);
4cab61369879 Prevent invalid packets being sent during key-exchange, instead queue Matt Johnston <matt@ucc.asn.au> parents: 448 diff changeset	475 tmp_item = curr_item;
4cab61369879 Prevent invalid packets being sent during key-exchange, instead queue Matt Johnston <matt@ucc.asn.au> parents: 448 diff changeset	476 curr_item = curr_item->next;
4cab61369879 Prevent invalid packets being sent during key-exchange, instead queue Matt Johnston <matt@ucc.asn.au> parents: 448 diff changeset	477 m_free(tmp_item);
4cab61369879 Prevent invalid packets being sent during key-exchange, instead queue Matt Johnston <matt@ucc.asn.au> parents: 448 diff changeset	478 encrypt_packet();
4cab61369879 Prevent invalid packets being sent during key-exchange, instead queue Matt Johnston <matt@ucc.asn.au> parents: 448 diff changeset	479 }
4cab61369879 Prevent invalid packets being sent during key-exchange, instead queue Matt Johnston <matt@ucc.asn.au> parents: 448 diff changeset	480 ses.reply_queue_head = ses.reply_queue_tail = NULL;
4cab61369879 Prevent invalid packets being sent during key-exchange, instead queue Matt Johnston <matt@ucc.asn.au> parents: 448 diff changeset	481 }
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	482
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	483 /* encrypt the writepayload, putting into writebuf, ready for write_packet()
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	484 * to put on the wire */
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	485 void encrypt_packet() {
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	486
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	487 unsigned char padlen;
533 805ae74ec024 Encrypt in-place, avoid an extra malloc Matt Johnston <matt@ucc.asn.au> parents: 532 diff changeset	488 unsigned char blocksize, mac_size;
805ae74ec024 Encrypt in-place, avoid an extra malloc Matt Johnston <matt@ucc.asn.au> parents: 532 diff changeset	489 buffer * writebuf; /* the packet which will go on the wire. This is
805ae74ec024 Encrypt in-place, avoid an extra malloc Matt Johnston <matt@ucc.asn.au> parents: 532 diff changeset	490 encrypted in-place. */
592 afb089e70892 Don't reset last_packet_time when we're transmitting SSH_MSG_IGNORE packets Matt Johnston <matt@ucc.asn.au> parents: 568 diff changeset	491 unsigned char packet_type;
533 805ae74ec024 Encrypt in-place, avoid an extra malloc Matt Johnston <matt@ucc.asn.au> parents: 532 diff changeset	492 unsigned int len, encrypt_buf_size;
805ae74ec024 Encrypt in-place, avoid an extra malloc Matt Johnston <matt@ucc.asn.au> parents: 532 diff changeset	493 unsigned char mac_bytes[MAX_MAC_LEN];
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	494
165 0cfba3034be5 Fixed DEBUG_TRACE macro so that we don't get semicolons left about the place Matt Johnston <matt@ucc.asn.au> parents: 70 diff changeset	495 TRACE(("enter encrypt_packet()"))
592 afb089e70892 Don't reset last_packet_time when we're transmitting SSH_MSG_IGNORE packets Matt Johnston <matt@ucc.asn.au> parents: 568 diff changeset	496
afb089e70892 Don't reset last_packet_time when we're transmitting SSH_MSG_IGNORE packets Matt Johnston <matt@ucc.asn.au> parents: 568 diff changeset	497 buf_setpos(ses.writepayload, 0);
afb089e70892 Don't reset last_packet_time when we're transmitting SSH_MSG_IGNORE packets Matt Johnston <matt@ucc.asn.au> parents: 568 diff changeset	498 packet_type = buf_getbyte(ses.writepayload);
afb089e70892 Don't reset last_packet_time when we're transmitting SSH_MSG_IGNORE packets Matt Johnston <matt@ucc.asn.au> parents: 568 diff changeset	499 buf_setpos(ses.writepayload, 0);
afb089e70892 Don't reset last_packet_time when we're transmitting SSH_MSG_IGNORE packets Matt Johnston <matt@ucc.asn.au> parents: 568 diff changeset	500
afb089e70892 Don't reset last_packet_time when we're transmitting SSH_MSG_IGNORE packets Matt Johnston <matt@ucc.asn.au> parents: 568 diff changeset	501 TRACE(("encrypt_packet type is %d", packet_type))
452 4cab61369879 Prevent invalid packets being sent during key-exchange, instead queue Matt Johnston <matt@ucc.asn.au> parents: 448 diff changeset	502
623 895fbe068f2c Fix case where "-K 1" would cause a SSH_MSG_IGNORE packet to be sent Matt Johnston <matt@ucc.asn.au> parents: 605 diff changeset	503 if ((!ses.dataallowed && !packet_is_okay_kex(packet_type))
895fbe068f2c Fix case where "-K 1" would cause a SSH_MSG_IGNORE packet to be sent Matt Johnston <matt@ucc.asn.au> parents: 605 diff changeset	504 \|\| ses.kexstate.sentnewkeys) {
452 4cab61369879 Prevent invalid packets being sent during key-exchange, instead queue Matt Johnston <matt@ucc.asn.au> parents: 448 diff changeset	505 /* During key exchange only particular packets are allowed.
592 afb089e70892 Don't reset last_packet_time when we're transmitting SSH_MSG_IGNORE packets Matt Johnston <matt@ucc.asn.au> parents: 568 diff changeset	506 Since this packet_type isn't OK we just enqueue it to send
452 4cab61369879 Prevent invalid packets being sent during key-exchange, instead queue Matt Johnston <matt@ucc.asn.au> parents: 448 diff changeset	507 after the KEX, see maybe_flush_reply_queue */
623 895fbe068f2c Fix case where "-K 1" would cause a SSH_MSG_IGNORE packet to be sent Matt Johnston <matt@ucc.asn.au> parents: 605 diff changeset	508
895fbe068f2c Fix case where "-K 1" would cause a SSH_MSG_IGNORE packet to be sent Matt Johnston <matt@ucc.asn.au> parents: 605 diff changeset	509 /* We also enqueue packets here when we have sent a MSG_NEWKEYS
895fbe068f2c Fix case where "-K 1" would cause a SSH_MSG_IGNORE packet to be sent Matt Johnston <matt@ucc.asn.au> parents: 605 diff changeset	510 * packet but are yet to received one. For simplicity we just switch
895fbe068f2c Fix case where "-K 1" would cause a SSH_MSG_IGNORE packet to be sent Matt Johnston <matt@ucc.asn.au> parents: 605 diff changeset	511 * over all the keys at once. This is the 'ses.kexstate.sentnewkeys'
895fbe068f2c Fix case where "-K 1" would cause a SSH_MSG_IGNORE packet to be sent Matt Johnston <matt@ucc.asn.au> parents: 605 diff changeset	512 * case. */
452 4cab61369879 Prevent invalid packets being sent during key-exchange, instead queue Matt Johnston <matt@ucc.asn.au> parents: 448 diff changeset	513 enqueue_reply_packet();
4cab61369879 Prevent invalid packets being sent during key-exchange, instead queue Matt Johnston <matt@ucc.asn.au> parents: 448 diff changeset	514 return;
4cab61369879 Prevent invalid packets being sent during key-exchange, instead queue Matt Johnston <matt@ucc.asn.au> parents: 448 diff changeset	515 }
4cab61369879 Prevent invalid packets being sent during key-exchange, instead queue Matt Johnston <matt@ucc.asn.au> parents: 448 diff changeset	516
534 0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf Matt Johnston <matt@ucc.asn.au> parents: 533 diff changeset	517 blocksize = ses.keys->trans.algo_crypt->blocksize;
0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf Matt Johnston <matt@ucc.asn.au> parents: 533 diff changeset	518 mac_size = ses.keys->trans.algo_mac->hashsize;
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	519
605 53c21d4ec98a - Don't allow setting memLevel since that doesn't work properly Matt Johnston <matt@ucc.asn.au> parents: 594 diff changeset	520 /* Encrypted packet len is payload+5. We need to then make sure
53c21d4ec98a - Don't allow setting memLevel since that doesn't work properly Matt Johnston <matt@ucc.asn.au> parents: 594 diff changeset	521 * there is enough space for padding or MIN_PACKET_LEN.
53c21d4ec98a - Don't allow setting memLevel since that doesn't work properly Matt Johnston <matt@ucc.asn.au> parents: 594 diff changeset	522 * Add extra 3 since we need at least 4 bytes of padding */
53c21d4ec98a - Don't allow setting memLevel since that doesn't work properly Matt Johnston <matt@ucc.asn.au> parents: 594 diff changeset	523 encrypt_buf_size = (ses.writepayload->len+4+1)
53c21d4ec98a - Don't allow setting memLevel since that doesn't work properly Matt Johnston <matt@ucc.asn.au> parents: 594 diff changeset	524 + MAX(MIN_PACKET_LEN, blocksize) + 3
533 805ae74ec024 Encrypt in-place, avoid an extra malloc Matt Johnston <matt@ucc.asn.au> parents: 532 diff changeset	525 /* add space for the MAC at the end */
592 afb089e70892 Don't reset last_packet_time when we're transmitting SSH_MSG_IGNORE packets Matt Johnston <matt@ucc.asn.au> parents: 568 diff changeset	526 + mac_size
afb089e70892 Don't reset last_packet_time when we're transmitting SSH_MSG_IGNORE packets Matt Johnston <matt@ucc.asn.au> parents: 568 diff changeset	527 #ifndef DISABLE_ZLIB
605 53c21d4ec98a - Don't allow setting memLevel since that doesn't work properly Matt Johnston <matt@ucc.asn.au> parents: 594 diff changeset	528 /* some extra in case 'compression' makes it larger */
592 afb089e70892 Don't reset last_packet_time when we're transmitting SSH_MSG_IGNORE packets Matt Johnston <matt@ucc.asn.au> parents: 568 diff changeset	529 + ZLIB_COMPRESS_INCR
afb089e70892 Don't reset last_packet_time when we're transmitting SSH_MSG_IGNORE packets Matt Johnston <matt@ucc.asn.au> parents: 568 diff changeset	530 #endif
afb089e70892 Don't reset last_packet_time when we're transmitting SSH_MSG_IGNORE packets Matt Johnston <matt@ucc.asn.au> parents: 568 diff changeset	531 /* and an extra cleartext (stripped before transmission) byte for the
afb089e70892 Don't reset last_packet_time when we're transmitting SSH_MSG_IGNORE packets Matt Johnston <matt@ucc.asn.au> parents: 568 diff changeset	532 * packet type */
afb089e70892 Don't reset last_packet_time when we're transmitting SSH_MSG_IGNORE packets Matt Johnston <matt@ucc.asn.au> parents: 568 diff changeset	533 + 1;
501 d58c478bd399 Add support for [email protected] delayed compression. Matt Johnston <matt@ucc.asn.au> parents: 479 diff changeset	534
533 805ae74ec024 Encrypt in-place, avoid an extra malloc Matt Johnston <matt@ucc.asn.au> parents: 532 diff changeset	535 writebuf = buf_new(encrypt_buf_size);
805ae74ec024 Encrypt in-place, avoid an extra malloc Matt Johnston <matt@ucc.asn.au> parents: 532 diff changeset	536 buf_setlen(writebuf, PACKET_PAYLOAD_OFF);
805ae74ec024 Encrypt in-place, avoid an extra malloc Matt Johnston <matt@ucc.asn.au> parents: 532 diff changeset	537 buf_setpos(writebuf, PACKET_PAYLOAD_OFF);
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	538
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	539 #ifndef DISABLE_ZLIB
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	540 /* compression */
501 d58c478bd399 Add support for [email protected] delayed compression. Matt Johnston <matt@ucc.asn.au> parents: 479 diff changeset	541 if (is_compress_trans()) {
605 53c21d4ec98a - Don't allow setting memLevel since that doesn't work properly Matt Johnston <matt@ucc.asn.au> parents: 594 diff changeset	542 int compress_delta;
533 805ae74ec024 Encrypt in-place, avoid an extra malloc Matt Johnston <matt@ucc.asn.au> parents: 532 diff changeset	543 buf_compress(writebuf, ses.writepayload, ses.writepayload->len);
605 53c21d4ec98a - Don't allow setting memLevel since that doesn't work properly Matt Johnston <matt@ucc.asn.au> parents: 594 diff changeset	544 compress_delta = (writebuf->len - PACKET_PAYLOAD_OFF) - ses.writepayload->len;
53c21d4ec98a - Don't allow setting memLevel since that doesn't work properly Matt Johnston <matt@ucc.asn.au> parents: 594 diff changeset	545
53c21d4ec98a - Don't allow setting memLevel since that doesn't work properly Matt Johnston <matt@ucc.asn.au> parents: 594 diff changeset	546 /* Handle the case where 'compress' increased the size. */
53c21d4ec98a - Don't allow setting memLevel since that doesn't work properly Matt Johnston <matt@ucc.asn.au> parents: 594 diff changeset	547 if (compress_delta > ZLIB_COMPRESS_INCR) {
53c21d4ec98a - Don't allow setting memLevel since that doesn't work properly Matt Johnston <matt@ucc.asn.au> parents: 594 diff changeset	548 buf_resize(writebuf, writebuf->size + compress_delta);
53c21d4ec98a - Don't allow setting memLevel since that doesn't work properly Matt Johnston <matt@ucc.asn.au> parents: 594 diff changeset	549 }
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	550 } else
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	551 #endif
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	552 {
533 805ae74ec024 Encrypt in-place, avoid an extra malloc Matt Johnston <matt@ucc.asn.au> parents: 532 diff changeset	553 memcpy(buf_getwriteptr(writebuf, ses.writepayload->len),
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	554 buf_getptr(ses.writepayload, ses.writepayload->len),
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	555 ses.writepayload->len);
533 805ae74ec024 Encrypt in-place, avoid an extra malloc Matt Johnston <matt@ucc.asn.au> parents: 532 diff changeset	556 buf_incrwritepos(writebuf, ses.writepayload->len);
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	557 }
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	558
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	559 /* finished with payload */
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	560 buf_setpos(ses.writepayload, 0);
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	561 buf_setlen(ses.writepayload, 0);
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	562
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	563 /* length of padding - packet length must be a multiple of blocksize,
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	564 * with a minimum of 4 bytes of padding */
533 805ae74ec024 Encrypt in-place, avoid an extra malloc Matt Johnston <matt@ucc.asn.au> parents: 532 diff changeset	565 padlen = blocksize - (writebuf->len) % blocksize;
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	566 if (padlen < 4) {
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	567 padlen += blocksize;
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	568 }
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	569 /* check for min packet length */
533 805ae74ec024 Encrypt in-place, avoid an extra malloc Matt Johnston <matt@ucc.asn.au> parents: 532 diff changeset	570 if (writebuf->len + padlen < MIN_PACKET_LEN) {
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	571 padlen += blocksize;
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	572 }
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	573
533 805ae74ec024 Encrypt in-place, avoid an extra malloc Matt Johnston <matt@ucc.asn.au> parents: 532 diff changeset	574 buf_setpos(writebuf, 0);
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	575 /* packet length excluding the packetlength uint32 */
533 805ae74ec024 Encrypt in-place, avoid an extra malloc Matt Johnston <matt@ucc.asn.au> parents: 532 diff changeset	576 buf_putint(writebuf, writebuf->len + padlen - 4);
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	577
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	578 /* padding len */
533 805ae74ec024 Encrypt in-place, avoid an extra malloc Matt Johnston <matt@ucc.asn.au> parents: 532 diff changeset	579 buf_putbyte(writebuf, padlen);
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	580 /* actual padding */
533 805ae74ec024 Encrypt in-place, avoid an extra malloc Matt Johnston <matt@ucc.asn.au> parents: 532 diff changeset	581 buf_setpos(writebuf, writebuf->len);
805ae74ec024 Encrypt in-place, avoid an extra malloc Matt Johnston <matt@ucc.asn.au> parents: 532 diff changeset	582 buf_incrlen(writebuf, padlen);
805ae74ec024 Encrypt in-place, avoid an extra malloc Matt Johnston <matt@ucc.asn.au> parents: 532 diff changeset	583 genrandom(buf_getptr(writebuf, padlen), padlen);
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	584
534 0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf Matt Johnston <matt@ucc.asn.au> parents: 533 diff changeset	585 make_mac(ses.transseq, &ses.keys->trans, writebuf, writebuf->len, mac_bytes);
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	586
533 805ae74ec024 Encrypt in-place, avoid an extra malloc Matt Johnston <matt@ucc.asn.au> parents: 532 diff changeset	587 /* do the actual encryption, in-place */
805ae74ec024 Encrypt in-place, avoid an extra malloc Matt Johnston <matt@ucc.asn.au> parents: 532 diff changeset	588 buf_setpos(writebuf, 0);
805ae74ec024 Encrypt in-place, avoid an extra malloc Matt Johnston <matt@ucc.asn.au> parents: 532 diff changeset	589 /* encrypt it in-place*/
805ae74ec024 Encrypt in-place, avoid an extra malloc Matt Johnston <matt@ucc.asn.au> parents: 532 diff changeset	590 len = writebuf->len;
534 0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf Matt Johnston <matt@ucc.asn.au> parents: 533 diff changeset	591 if (ses.keys->trans.crypt_mode->encrypt(
533 805ae74ec024 Encrypt in-place, avoid an extra malloc Matt Johnston <matt@ucc.asn.au> parents: 532 diff changeset	592 buf_getptr(writebuf, len),
528 378a6389f88e - Don't be dumb and encrypt/decrypt in a while() loop - why did I do this?? Matt Johnston <matt@ucc.asn.au> parents: 513 diff changeset	593 buf_getwriteptr(writebuf, len),
378a6389f88e - Don't be dumb and encrypt/decrypt in a while() loop - why did I do this?? Matt Johnston <matt@ucc.asn.au> parents: 513 diff changeset	594 len,
534 0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf Matt Johnston <matt@ucc.asn.au> parents: 533 diff changeset	595 &ses.keys->trans.cipher_state) != CRYPT_OK) {
594 a98a2138364a Improve capitalisation for all logged strings Matt Johnston <matt@ucc.asn.au> parents: 592 diff changeset	596 dropbear_exit("Error encrypting");
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	597 }
533 805ae74ec024 Encrypt in-place, avoid an extra malloc Matt Johnston <matt@ucc.asn.au> parents: 532 diff changeset	598 buf_incrpos(writebuf, len);
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	599
533 805ae74ec024 Encrypt in-place, avoid an extra malloc Matt Johnston <matt@ucc.asn.au> parents: 532 diff changeset	600 /* stick the MAC on it */
805ae74ec024 Encrypt in-place, avoid an extra malloc Matt Johnston <matt@ucc.asn.au> parents: 532 diff changeset	601 buf_putbytes(writebuf, mac_bytes, mac_size);
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	602
592 afb089e70892 Don't reset last_packet_time when we're transmitting SSH_MSG_IGNORE packets Matt Johnston <matt@ucc.asn.au> parents: 568 diff changeset	603 /* The last byte of the buffer stores the cleartext packet_type. It is not
afb089e70892 Don't reset last_packet_time when we're transmitting SSH_MSG_IGNORE packets Matt Johnston <matt@ucc.asn.au> parents: 568 diff changeset	604 * transmitted but is used for transmit timeout purposes */
afb089e70892 Don't reset last_packet_time when we're transmitting SSH_MSG_IGNORE packets Matt Johnston <matt@ucc.asn.au> parents: 568 diff changeset	605 buf_putbyte(writebuf, packet_type);
533 805ae74ec024 Encrypt in-place, avoid an extra malloc Matt Johnston <matt@ucc.asn.au> parents: 532 diff changeset	606 /* enqueue the packet for sending. It will get freed after transmission. */
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	607 buf_setpos(writebuf, 0);
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	608 enqueue(&ses.writequeue, (void*)writebuf);
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	609
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	610 /* Update counts */
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	611 ses.kexstate.datatrans += writebuf->len;
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	612 ses.transseq++;
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	613
165 0cfba3034be5 Fixed DEBUG_TRACE macro so that we don't get semicolons left about the place Matt Johnston <matt@ucc.asn.au> parents: 70 diff changeset	614 TRACE(("leave encrypt_packet()"))
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	615 }
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	616
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	617
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	618 /* Create the packet mac, and append H(seqno\|clearbuf) to the output */
534 0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf Matt Johnston <matt@ucc.asn.au> parents: 533 diff changeset	619 /* output_mac must have ses.keys->trans.algo_mac->hashsize bytes. */
0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf Matt Johnston <matt@ucc.asn.au> parents: 533 diff changeset	620 static void make_mac(unsigned int seqno, const struct key_context_directional * key_state,
0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf Matt Johnston <matt@ucc.asn.au> parents: 533 diff changeset	621 buffer * clear_buf, unsigned int clear_len,
0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf Matt Johnston <matt@ucc.asn.au> parents: 533 diff changeset	622 unsigned char *output_mac) {
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	623 unsigned char seqbuf[4];
228 5e4110bb753a - Fixed twofish algorithm naming so it actually works. Matt Johnston <matt@ucc.asn.au> parents: 194 diff changeset	624 unsigned long bufsize;
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	625 hmac_state hmac;
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	626
165 0cfba3034be5 Fixed DEBUG_TRACE macro so that we don't get semicolons left about the place Matt Johnston <matt@ucc.asn.au> parents: 70 diff changeset	627 TRACE(("enter writemac"))
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	628
534 0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf Matt Johnston <matt@ucc.asn.au> parents: 533 diff changeset	629 if (key_state->algo_mac->hashsize > 0) {
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	630 /* calculate the mac */
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	631 if (hmac_init(&hmac,
534 0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf Matt Johnston <matt@ucc.asn.au> parents: 533 diff changeset	632 key_state->hash_index,
0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf Matt Johnston <matt@ucc.asn.au> parents: 533 diff changeset	633 key_state->mackey,
0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf Matt Johnston <matt@ucc.asn.au> parents: 533 diff changeset	634 key_state->algo_mac->keysize) != CRYPT_OK) {
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	635 dropbear_exit("HMAC error");
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	636 }
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	637
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	638 /* sequence number */
534 0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf Matt Johnston <matt@ucc.asn.au> parents: 533 diff changeset	639 STORE32H(seqno, seqbuf);
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	640 if (hmac_process(&hmac, seqbuf, 4) != CRYPT_OK) {
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	641 dropbear_exit("HMAC error");
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	642 }
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	643
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	644 /* the actual contents */
534 0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf Matt Johnston <matt@ucc.asn.au> parents: 533 diff changeset	645 buf_setpos(clear_buf, 0);
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	646 if (hmac_process(&hmac,
534 0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf Matt Johnston <matt@ucc.asn.au> parents: 533 diff changeset	647 buf_getptr(clear_buf, clear_len),
0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf Matt Johnston <matt@ucc.asn.au> parents: 533 diff changeset	648 clear_len) != CRYPT_OK) {
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	649 dropbear_exit("HMAC error");
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	650 }
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	651
533 805ae74ec024 Encrypt in-place, avoid an extra malloc Matt Johnston <matt@ucc.asn.au> parents: 532 diff changeset	652 bufsize = MAX_MAC_LEN;
805ae74ec024 Encrypt in-place, avoid an extra malloc Matt Johnston <matt@ucc.asn.au> parents: 532 diff changeset	653 if (hmac_done(&hmac, output_mac, &bufsize) != CRYPT_OK) {
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	654 dropbear_exit("HMAC error");
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	655 }
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	656 }
165 0cfba3034be5 Fixed DEBUG_TRACE macro so that we don't get semicolons left about the place Matt Johnston <matt@ucc.asn.au> parents: 70 diff changeset	657 TRACE(("leave writemac"))
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	658 }
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	659
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	660 #ifndef DISABLE_ZLIB
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	661 /* compresses len bytes from src, outputting to dest (starting from the
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	662 * respective current positions. */
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	663 static void buf_compress(buffer * dest, buffer * src, unsigned int len) {
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	664
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	665 unsigned int endpos = src->pos + len;
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	666 int result;
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	667
165 0cfba3034be5 Fixed DEBUG_TRACE macro so that we don't get semicolons left about the place Matt Johnston <matt@ucc.asn.au> parents: 70 diff changeset	668 TRACE(("enter buf_compress"))
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	669
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	670 while (1) {
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	671
534 0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf Matt Johnston <matt@ucc.asn.au> parents: 533 diff changeset	672 ses.keys->trans.zstream->avail_in = endpos - src->pos;
0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf Matt Johnston <matt@ucc.asn.au> parents: 533 diff changeset	673 ses.keys->trans.zstream->next_in =
0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf Matt Johnston <matt@ucc.asn.au> parents: 533 diff changeset	674 buf_getptr(src, ses.keys->trans.zstream->avail_in);
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	675
534 0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf Matt Johnston <matt@ucc.asn.au> parents: 533 diff changeset	676 ses.keys->trans.zstream->avail_out = dest->size - dest->pos;
0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf Matt Johnston <matt@ucc.asn.au> parents: 533 diff changeset	677 ses.keys->trans.zstream->next_out =
0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf Matt Johnston <matt@ucc.asn.au> parents: 533 diff changeset	678 buf_getwriteptr(dest, ses.keys->trans.zstream->avail_out);
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	679
534 0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf Matt Johnston <matt@ucc.asn.au> parents: 533 diff changeset	680 result = deflate(ses.keys->trans.zstream, Z_SYNC_FLUSH);
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	681
534 0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf Matt Johnston <matt@ucc.asn.au> parents: 533 diff changeset	682 buf_setpos(src, endpos - ses.keys->trans.zstream->avail_in);
0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf Matt Johnston <matt@ucc.asn.au> parents: 533 diff changeset	683 buf_setlen(dest, dest->size - ses.keys->trans.zstream->avail_out);
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	684 buf_setpos(dest, dest->len);
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	685
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	686 if (result != Z_OK) {
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	687 dropbear_exit("zlib error");
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	688 }
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	689
534 0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf Matt Johnston <matt@ucc.asn.au> parents: 533 diff changeset	690 if (ses.keys->trans.zstream->avail_in == 0) {
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	691 break;
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	692 }
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	693
534 0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf Matt Johnston <matt@ucc.asn.au> parents: 533 diff changeset	694 dropbear_assert(ses.keys->trans.zstream->avail_out == 0);
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	695
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	696 /* the buffer has been filled, we must extend. This only happens in
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	697 * unusual circumstances where the data grows in size after deflate(),
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	698 * but it is possible */
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	699 buf_resize(dest, dest->size + ZLIB_COMPRESS_INCR);
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	700
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	701 }
165 0cfba3034be5 Fixed DEBUG_TRACE macro so that we don't get semicolons left about the place Matt Johnston <matt@ucc.asn.au> parents: 70 diff changeset	702 TRACE(("leave buf_compress"))
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	703 }
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	704 #endif

Mercurial > dropbear

annotate packet.c @ 728:f27058078d61