dropbear: packet.c annotate

annotate packet.c @ 891:e78f5ce6e7bb

cleanup before clearing keys

author	Matt Johnston <matt@ucc.asn.au>
date	Wed, 12 Feb 2014 22:15:02 +0800
parents	220f55d540ae
children	4696755c4cac

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"
858 220f55d540ae rename random.h to dbrandom.h since some OSes have a system random.h Matt Johnston <matt@ucc.asn.au> parents: 857 diff changeset	33 #include "dbrandom.h"
27 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
791 0bf76f54de6f Limit decompressed size Matt Johnston <matt@ucc.asn.au> parents: 753 diff changeset	45 #define ZLIB_DECOMPRESS_INCR 1024
27 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
731 9a5438271556 Move the more verbose TRACE() statements into TRACE2() Matt Johnston <matt@ucc.asn.au> parents: 728 diff changeset	65 TRACE2(("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);
752 24172f555f9c Fix MAC bug which would prevent asymmetric hashes Matt Johnston <matt@ucc.asn.au> parents: 731 diff changeset	77 TRACE2(("write_packet writev #%d type %d len %d/%d", i, packet_type,
24172f555f9c Fix MAC bug which would prevent asymmetric hashes Matt Johnston <matt@ucc.asn.au> parents: 731 diff changeset	78 len, writebuf->len-1))
728 f27058078d61 Try using writev() for writing packets out to tcp Matt Johnston <matt@ucc.asn.au> parents: 711 diff changeset	79 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	80 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	81 }
f27058078d61 Try using writev() for writing packets out to tcp Matt Johnston <matt@ucc.asn.au> parents: 711 diff changeset	82 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	83 if (written < 0) {
f27058078d61 Try using writev() for writing packets out to tcp Matt Johnston <matt@ucc.asn.au> parents: 711 diff changeset	84 if (errno == EINTR) {
f27058078d61 Try using writev() for writing packets out to tcp Matt Johnston <matt@ucc.asn.au> parents: 711 diff changeset	85 m_free(iov);
731 9a5438271556 Move the more verbose TRACE() statements into TRACE2() Matt Johnston <matt@ucc.asn.au> parents: 728 diff changeset	86 TRACE2(("leave writepacket: EINTR"))
728 f27058078d61 Try using writev() for writing packets out to tcp Matt Johnston <matt@ucc.asn.au> parents: 711 diff changeset	87 return;
f27058078d61 Try using writev() for writing packets out to tcp Matt Johnston <matt@ucc.asn.au> parents: 711 diff changeset	88 } else {
f27058078d61 Try using writev() for writing packets out to tcp Matt Johnston <matt@ucc.asn.au> parents: 711 diff changeset	89 dropbear_exit("Error writing");
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 }
f27058078d61 Try using writev() for writing packets out to tcp Matt Johnston <matt@ucc.asn.au> parents: 711 diff changeset	92
f27058078d61 Try using writev() for writing packets out to tcp Matt Johnston <matt@ucc.asn.au> parents: 711 diff changeset	93 if (written == 0) {
f27058078d61 Try using writev() for writing packets out to tcp Matt Johnston <matt@ucc.asn.au> parents: 711 diff changeset	94 ses.remoteclosed();
f27058078d61 Try using writev() for writing packets out to tcp Matt Johnston <matt@ucc.asn.au> parents: 711 diff changeset	95 }
f27058078d61 Try using writev() for writing packets out to tcp Matt Johnston <matt@ucc.asn.au> parents: 711 diff changeset	96
f27058078d61 Try using writev() for writing packets out to tcp Matt Johnston <matt@ucc.asn.au> parents: 711 diff changeset	97 while (written > 0) {
f27058078d61 Try using writev() for writing packets out to tcp Matt Johnston <matt@ucc.asn.au> parents: 711 diff changeset	98 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	99 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	100 if (len > written) {
857 c19acba28590 use oldstyle comments Matt Johnston <matt@ucc.asn.au> parents: 817 diff changeset	101 /* partial buffer write */
728 f27058078d61 Try using writev() for writing packets out to tcp Matt Johnston <matt@ucc.asn.au> parents: 711 diff changeset	102 buf_incrpos(writebuf, written);
f27058078d61 Try using writev() for writing packets out to tcp Matt Johnston <matt@ucc.asn.au> parents: 711 diff changeset	103 written = 0;
f27058078d61 Try using writev() for writing packets out to tcp Matt Johnston <matt@ucc.asn.au> parents: 711 diff changeset	104 } else {
f27058078d61 Try using writev() for writing packets out to tcp Matt Johnston <matt@ucc.asn.au> parents: 711 diff changeset	105 written -= len;
f27058078d61 Try using writev() for writing packets out to tcp Matt Johnston <matt@ucc.asn.au> parents: 711 diff changeset	106 dequeue(&ses.writequeue);
f27058078d61 Try using writev() for writing packets out to tcp Matt Johnston <matt@ucc.asn.au> parents: 711 diff changeset	107 buf_free(writebuf);
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 }
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 m_free(iov);
f27058078d61 Try using writev() for writing packets out to tcp Matt Johnston <matt@ucc.asn.au> parents: 711 diff changeset	112
f27058078d61 Try using writev() for writing packets out to tcp Matt Johnston <matt@ucc.asn.au> parents: 711 diff changeset	113 #else
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	114 /* 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	115 writebuf = (buffer*)examine(&ses.writequeue);
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	116
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	117 /* 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	118 * 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	119 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	120 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	121 dropbear_assert(len > 0);
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	122 /* 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	123 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	124
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	125 if (written < 0) {
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	126 if (errno == EINTR) {
731 9a5438271556 Move the more verbose TRACE() statements into TRACE2() Matt Johnston <matt@ucc.asn.au> parents: 728 diff changeset	127 TRACE2(("leave writepacket: EINTR"))
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	128 return;
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	129 } else {
594 a98a2138364a Improve capitalisation for all logged strings Matt Johnston <matt@ucc.asn.au> parents: 592 diff changeset	130 dropbear_exit("Error writing");
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	131 }
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	132 }
728 f27058078d61 Try using writev() for writing packets out to tcp Matt Johnston <matt@ucc.asn.au> parents: 711 diff changeset	133 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	134
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	135 if (written == 0) {
33 f789045062e6 Progressing client support Matt Johnston <matt@ucc.asn.au> parents: 27 diff changeset	136 ses.remoteclosed();
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	137 }
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	138
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	139 if (written == len) {
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	140 /* 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	141 dequeue(&ses.writequeue);
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	142 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	143 writebuf = NULL;
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	144 } else {
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	145 /* 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	146 buf_incrpos(writebuf, written);
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	147 }
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	148
728 f27058078d61 Try using writev() for writing packets out to tcp Matt Johnston <matt@ucc.asn.au> parents: 711 diff changeset	149 #endif
f27058078d61 Try using writev() for writing packets out to tcp Matt Johnston <matt@ucc.asn.au> parents: 711 diff changeset	150 now = time(NULL);
f27058078d61 Try using writev() for writing packets out to tcp Matt Johnston <matt@ucc.asn.au> parents: 711 diff changeset	151 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	152
f27058078d61 Try using writev() for writing packets out to tcp Matt Johnston <matt@ucc.asn.au> parents: 711 diff changeset	153 if (!all_ignore) {
f27058078d61 Try using writev() for writing packets out to tcp Matt Johnston <matt@ucc.asn.au> parents: 711 diff changeset	154 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	155 }
f27058078d61 Try using writev() for writing packets out to tcp Matt Johnston <matt@ucc.asn.au> parents: 711 diff changeset	156
731 9a5438271556 Move the more verbose TRACE() statements into TRACE2() Matt Johnston <matt@ucc.asn.au> parents: 728 diff changeset	157 TRACE2(("leave write_packet"))
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	158 }
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	159
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	160 /* 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	161 * 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	162 * full portion if possible */
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	163 void read_packet() {
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	164
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	165 int len;
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	166 unsigned int maxlen;
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	167 unsigned char blocksize;
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	168
731 9a5438271556 Move the more verbose TRACE() statements into TRACE2() Matt Johnston <matt@ucc.asn.au> parents: 728 diff changeset	169 TRACE2(("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	170 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	171
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	172 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	173 int ret;
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	174 /* In the first blocksize of a packet */
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	175
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	176 /* 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	177 * 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	178 ret = read_packet_init();
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	179
534 0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf Matt Johnston <matt@ucc.asn.au> parents: 533 diff changeset	180 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	181 /* didn't read enough to determine the length */
731 9a5438271556 Move the more verbose TRACE() statements into TRACE2() Matt Johnston <matt@ucc.asn.au> parents: 728 diff changeset	182 TRACE2(("leave read_packet: packetinit done"))
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	183 return;
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 }
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	186
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	187 /* 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	188 * mightn't be any available (EAGAIN) */
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	189 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	190 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	191 /* 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	192 * 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	193 */
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 = 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	195 } 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	196 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	197
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	198 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	199 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	200 }
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	201
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	202 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	203 if (errno == EINTR \|\| errno == EAGAIN) {
731 9a5438271556 Move the more verbose TRACE() statements into TRACE2() Matt Johnston <matt@ucc.asn.au> parents: 728 diff changeset	204 TRACE2(("leave read_packet: EINTR or EAGAIN"))
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	205 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	206 } 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	207 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	208 }
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	209 }
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	210
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	211 buf_incrpos(ses.readbuf, len);
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	212 }
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	213
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	214 if ((unsigned int)len == maxlen) {
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	215 /* The whole packet has been read */
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	216 decrypt_packet();
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	217 /* The main select() loop process_packet() to
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	218 * handle the packet contents... */
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	219 }
731 9a5438271556 Move the more verbose TRACE() statements into TRACE2() Matt Johnston <matt@ucc.asn.au> parents: 728 diff changeset	220 TRACE2(("leave read_packet"))
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	221 }
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	222
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	223 /* 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	224 * 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	225 /* 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	226 * DROPBEAR_FAILURE otherwise */
0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf Matt Johnston <matt@ucc.asn.au> parents: 533 diff changeset	227 static int read_packet_init() {
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	228
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	229 unsigned int maxlen;
568 005530560594 Rearrange getaddrstring() etc Matt Johnston <matt@ucc.asn.au> parents: 556 diff changeset	230 int slen;
005530560594 Rearrange getaddrstring() etc Matt Johnston <matt@ucc.asn.au> parents: 556 diff changeset	231 unsigned int len;
005530560594 Rearrange getaddrstring() etc Matt Johnston <matt@ucc.asn.au> parents: 556 diff changeset	232 unsigned int blocksize;
005530560594 Rearrange getaddrstring() etc Matt Johnston <matt@ucc.asn.au> parents: 556 diff changeset	233 unsigned int macsize;
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	234
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	235
534 0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf Matt Johnston <matt@ucc.asn.au> parents: 533 diff changeset	236 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	237 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	238
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	239 if (ses.readbuf == NULL) {
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	240 /* start of a new packet */
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	241 ses.readbuf = buf_new(INIT_READBUF);
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	242 }
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 maxlen = blocksize - ses.readbuf->pos;
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	245
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	246 /* read the rest of the packet if possible */
568 005530560594 Rearrange getaddrstring() etc Matt Johnston <matt@ucc.asn.au> parents: 556 diff changeset	247 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	248 maxlen);
568 005530560594 Rearrange getaddrstring() etc Matt Johnston <matt@ucc.asn.au> parents: 556 diff changeset	249 if (slen == 0) {
33 f789045062e6 Progressing client support Matt Johnston <matt@ucc.asn.au> parents: 27 diff changeset	250 ses.remoteclosed();
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	251 }
568 005530560594 Rearrange getaddrstring() etc Matt Johnston <matt@ucc.asn.au> parents: 556 diff changeset	252 if (slen < 0) {
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	253 if (errno == EINTR) {
731 9a5438271556 Move the more verbose TRACE() statements into TRACE2() Matt Johnston <matt@ucc.asn.au> parents: 728 diff changeset	254 TRACE2(("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	255 return DROPBEAR_FAILURE;
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	256 }
594 a98a2138364a Improve capitalisation for all logged strings Matt Johnston <matt@ucc.asn.au> parents: 592 diff changeset	257 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	258 }
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 buf_incrwritepos(ses.readbuf, slen);
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	261
568 005530560594 Rearrange getaddrstring() etc Matt Johnston <matt@ucc.asn.au> parents: 556 diff changeset	262 if ((unsigned int)slen != maxlen) {
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	263 /* 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	264 return DROPBEAR_FAILURE;
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	265 }
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	266
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	267 /* 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	268 * 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	269 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	270 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	271 buf_getwriteptr(ses.readbuf, blocksize),
502 43bbe17d6ba0 - Add Counter Mode support Matt Johnston <matt@ucc.asn.au> parents: 501 diff changeset	272 blocksize,
534 0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf Matt Johnston <matt@ucc.asn.au> parents: 533 diff changeset	273 &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	274 dropbear_exit("Error decrypting");
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 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	277
731 9a5438271556 Move the more verbose TRACE() statements into TRACE2() Matt Johnston <matt@ucc.asn.au> parents: 728 diff changeset	278 TRACE2(("packet size is %d, block %d mac %d", len, blocksize, macsize))
534 0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf Matt Johnston <matt@ucc.asn.au> parents: 533 diff changeset	279
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	280
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	281 /* 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	282 if ((len > RECV_MAX_PACKET_LEN) \|\|
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	283 (len < MIN_PACKET_LEN + macsize) \|\|
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	284 ((len - macsize) % blocksize != 0)) {
594 a98a2138364a Improve capitalisation for all logged strings Matt Johnston <matt@ucc.asn.au> parents: 592 diff changeset	285 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	286 }
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	287
534 0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf Matt Johnston <matt@ucc.asn.au> parents: 533 diff changeset	288 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	289 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	290 }
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	291 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	292 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	293 return DROPBEAR_SUCCESS;
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	294 }
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	295
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	296 /* handle the received packet */
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	297 void decrypt_packet() {
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	298
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	299 unsigned char blocksize;
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	300 unsigned char macsize;
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	301 unsigned int padlen;
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	302 unsigned int len;
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	303
731 9a5438271556 Move the more verbose TRACE() statements into TRACE2() Matt Johnston <matt@ucc.asn.au> parents: 728 diff changeset	304 TRACE2(("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	305 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	306 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	307
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	308 ses.kexstate.datarecv += ses.readbuf->len;
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	309
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	310 /* 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	311 buf_setpos(ses.readbuf, blocksize);
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	312
534 0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf Matt Johnston <matt@ucc.asn.au> parents: 533 diff changeset	313 /* 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	314 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	315 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	316 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	317 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	318 len,
534 0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf Matt Johnston <matt@ucc.asn.au> parents: 533 diff changeset	319 &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	320 dropbear_exit("Error decrypting");
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	321 }
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	322 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	323
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	324 /* 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	325 if (checkmac() != DROPBEAR_SUCCESS) {
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	326 dropbear_exit("Integrity error");
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	327 }
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	328
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	329 /* 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	330 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	331 padlen = buf_getbyte(ses.readbuf);
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	332
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	333 /* payload length */
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	334 /* - 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	335 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	336 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	337 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	338 }
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	339
534 0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf Matt Johnston <matt@ucc.asn.au> parents: 533 diff changeset	340 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	341
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	342 #ifndef DISABLE_ZLIB
501 d58c478bd399 Add support for [email protected] delayed compression. Matt Johnston <matt@ucc.asn.au> parents: 479 diff changeset	343 if (is_compress_recv()) {
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	344 /* decompress */
534 0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf Matt Johnston <matt@ucc.asn.au> parents: 533 diff changeset	345 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	346 } else
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	347 #endif
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	348 {
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	349 /* copy payload */
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	350 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	351 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	352 buf_incrlen(ses.payload, len);
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	353 }
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	354
534 0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf Matt Johnston <matt@ucc.asn.au> parents: 533 diff changeset	355 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	356 ses.readbuf = NULL;
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	357 buf_setpos(ses.payload, 0);
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	358
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	359 ses.recvseq++;
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	360
731 9a5438271556 Move the more verbose TRACE() statements into TRACE2() Matt Johnston <matt@ucc.asn.au> parents: 728 diff changeset	361 TRACE2(("leave decrypt_packet"))
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	362 }
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	363
534 0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf Matt Johnston <matt@ucc.asn.au> parents: 533 diff changeset	364 /* 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	365 * 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	366 static int checkmac() {
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	367
534 0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf Matt Johnston <matt@ucc.asn.au> parents: 533 diff changeset	368 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	369 unsigned int mac_size, contents_len;
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	370
752 24172f555f9c Fix MAC bug which would prevent asymmetric hashes Matt Johnston <matt@ucc.asn.au> parents: 731 diff changeset	371 mac_size = ses.keys->recv.algo_mac->hashsize;
534 0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf Matt Johnston <matt@ucc.asn.au> parents: 533 diff changeset	372 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	373
534 0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf Matt Johnston <matt@ucc.asn.au> parents: 533 diff changeset	374 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	375 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	376
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	377 /* 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	378 buf_setpos(ses.readbuf, contents_len);
817 a625f9e135a4 Constant time memcmp for the hmac and password crypt Matt Johnston <matt@ucc.asn.au> parents: 791 diff changeset	379 if (constant_time_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	380 return DROPBEAR_FAILURE;
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	381 } else {
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	382 return DROPBEAR_SUCCESS;
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 }
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	385
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	386 #ifndef DISABLE_ZLIB
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	387 /* 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	388 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	389
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	390 int result;
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	391 buffer * ret;
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	392 z_streamp zstream;
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	393
534 0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf Matt Johnston <matt@ucc.asn.au> parents: 533 diff changeset	394 zstream = ses.keys->recv.zstream;
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	395 ret = buf_new(len);
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	396
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	397 zstream->avail_in = len;
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	398 zstream->next_in = buf_getptr(buf, len);
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	399
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	400 /* 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	401 while (1) {
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	402
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	403 zstream->avail_out = ret->size - ret->pos;
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	404 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	405
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	406 result = inflate(zstream, Z_SYNC_FLUSH);
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	407
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	408 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	409 buf_setpos(ret, ret->len);
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	410
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	411 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	412 dropbear_exit("zlib error");
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	413 }
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	414
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	415 if (zstream->avail_in == 0 &&
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	416 (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	417 /* 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	418 * and there's no remaining input */
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	419 return ret;
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	420 }
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	421
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	422 if (zstream->avail_out == 0) {
791 0bf76f54de6f Limit decompressed size Matt Johnston <matt@ucc.asn.au> parents: 753 diff changeset	423 int new_size = 0;
0bf76f54de6f Limit decompressed size Matt Johnston <matt@ucc.asn.au> parents: 753 diff changeset	424 if (ret->size >= RECV_MAX_PAYLOAD_LEN) {
0bf76f54de6f Limit decompressed size Matt Johnston <matt@ucc.asn.au> parents: 753 diff changeset	425 dropbear_exit("bad packet, oversized decompressed");
0bf76f54de6f Limit decompressed size Matt Johnston <matt@ucc.asn.au> parents: 753 diff changeset	426 }
0bf76f54de6f Limit decompressed size Matt Johnston <matt@ucc.asn.au> parents: 753 diff changeset	427 new_size = MIN(RECV_MAX_PAYLOAD_LEN, ret->size + ZLIB_DECOMPRESS_INCR);
0bf76f54de6f Limit decompressed size Matt Johnston <matt@ucc.asn.au> parents: 753 diff changeset	428 buf_resize(ret, new_size);
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	429 }
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	430 }
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	431 }
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	432 #endif
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	433
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	434
452 4cab61369879 Prevent invalid packets being sent during key-exchange, instead queue Matt Johnston <matt@ucc.asn.au> parents: 448 diff changeset	435 /* 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	436 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	437 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	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 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	441 return 0;
4cab61369879 Prevent invalid packets being sent during key-exchange, instead queue Matt Johnston <matt@ucc.asn.au> parents: 448 diff changeset	442 }
4cab61369879 Prevent invalid packets being sent during key-exchange, instead queue Matt Johnston <matt@ucc.asn.au> parents: 448 diff changeset	443 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	444 /* 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	445 return 0;
4cab61369879 Prevent invalid packets being sent during key-exchange, instead queue Matt Johnston <matt@ucc.asn.au> parents: 448 diff changeset	446 }
4cab61369879 Prevent invalid packets being sent during key-exchange, instead queue Matt Johnston <matt@ucc.asn.au> parents: 448 diff changeset	447 return 1;
4cab61369879 Prevent invalid packets being sent during key-exchange, instead queue Matt Johnston <matt@ucc.asn.au> parents: 448 diff changeset	448 }
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	449
452 4cab61369879 Prevent invalid packets being sent during key-exchange, instead queue Matt Johnston <matt@ucc.asn.au> parents: 448 diff changeset	450 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	451 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	452 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	453 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	454
4cab61369879 Prevent invalid packets being sent during key-exchange, instead queue Matt Johnston <matt@ucc.asn.au> parents: 448 diff changeset	455 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	456 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	457 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	458
4cab61369879 Prevent invalid packets being sent during key-exchange, instead queue Matt Johnston <matt@ucc.asn.au> parents: 448 diff changeset	459 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	460 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	461 } else {
4cab61369879 Prevent invalid packets being sent during key-exchange, instead queue Matt Johnston <matt@ucc.asn.au> parents: 448 diff changeset	462 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	463 }
456 f6c999ba31da Fix delayed packet queue handling Matt Johnston <matt@ucc.asn.au> parents: 454 diff changeset	464 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	465 }
4cab61369879 Prevent invalid packets being sent during key-exchange, instead queue Matt Johnston <matt@ucc.asn.au> parents: 448 diff changeset	466
4cab61369879 Prevent invalid packets being sent during key-exchange, instead queue Matt Johnston <matt@ucc.asn.au> parents: 448 diff changeset	467 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	468 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	469 if (!ses.dataallowed)
4cab61369879 Prevent invalid packets being sent during key-exchange, instead queue Matt Johnston <matt@ucc.asn.au> parents: 448 diff changeset	470 {
4cab61369879 Prevent invalid packets being sent during key-exchange, instead queue Matt Johnston <matt@ucc.asn.au> parents: 448 diff changeset	471 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	472 return;
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
4cab61369879 Prevent invalid packets being sent during key-exchange, instead queue Matt Johnston <matt@ucc.asn.au> parents: 448 diff changeset	475 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	476 CHECKCLEARTOWRITE();
4cab61369879 Prevent invalid packets being sent during key-exchange, instead queue Matt Johnston <matt@ucc.asn.au> parents: 448 diff changeset	477 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	478 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	479
4cab61369879 Prevent invalid packets being sent during key-exchange, instead queue Matt Johnston <matt@ucc.asn.au> parents: 448 diff changeset	480 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	481 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	482 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	483 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	484 encrypt_packet();
4cab61369879 Prevent invalid packets being sent during key-exchange, instead queue Matt Johnston <matt@ucc.asn.au> parents: 448 diff changeset	485 }
4cab61369879 Prevent invalid packets being sent during key-exchange, instead queue Matt Johnston <matt@ucc.asn.au> parents: 448 diff changeset	486 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	487 }
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	488
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	489 /* 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	490 * to put on the wire */
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	491 void encrypt_packet() {
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	492
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	493 unsigned char padlen;
533 805ae74ec024 Encrypt in-place, avoid an extra malloc Matt Johnston <matt@ucc.asn.au> parents: 532 diff changeset	494 unsigned char blocksize, mac_size;
805ae74ec024 Encrypt in-place, avoid an extra malloc Matt Johnston <matt@ucc.asn.au> parents: 532 diff changeset	495 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	496 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	497 unsigned char packet_type;
533 805ae74ec024 Encrypt in-place, avoid an extra malloc Matt Johnston <matt@ucc.asn.au> parents: 532 diff changeset	498 unsigned int len, encrypt_buf_size;
805ae74ec024 Encrypt in-place, avoid an extra malloc Matt Johnston <matt@ucc.asn.au> parents: 532 diff changeset	499 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	500
731 9a5438271556 Move the more verbose TRACE() statements into TRACE2() Matt Johnston <matt@ucc.asn.au> parents: 728 diff changeset	501 TRACE2(("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	502
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	503 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	504 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	505 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	506
731 9a5438271556 Move the more verbose TRACE() statements into TRACE2() Matt Johnston <matt@ucc.asn.au> parents: 728 diff changeset	507 TRACE2(("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	508
752 24172f555f9c Fix MAC bug which would prevent asymmetric hashes Matt Johnston <matt@ucc.asn.au> parents: 731 diff changeset	509 if ((!ses.dataallowed && !packet_is_okay_kex(packet_type))) {
452 4cab61369879 Prevent invalid packets being sent during key-exchange, instead queue Matt Johnston <matt@ucc.asn.au> parents: 448 diff changeset	510 /* 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	511 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	512 after the KEX, see 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	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
731 9a5438271556 Move the more verbose TRACE() statements into TRACE2() Matt Johnston <matt@ucc.asn.au> parents: 728 diff changeset	614 TRACE2(("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
534 0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf Matt Johnston <matt@ucc.asn.au> parents: 533 diff changeset	627 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	628 /* calculate the mac */
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	629 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	630 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	631 key_state->mackey,
0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf Matt Johnston <matt@ucc.asn.au> parents: 533 diff changeset	632 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	633 dropbear_exit("HMAC error");
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	634 }
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	635
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	636 /* sequence number */
534 0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf Matt Johnston <matt@ucc.asn.au> parents: 533 diff changeset	637 STORE32H(seqno, seqbuf);
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	638 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	639 dropbear_exit("HMAC error");
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	640 }
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	641
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	642 /* 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	643 buf_setpos(clear_buf, 0);
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	644 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	645 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	646 clear_len) != CRYPT_OK) {
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	647 dropbear_exit("HMAC error");
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	648 }
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	649
533 805ae74ec024 Encrypt in-place, avoid an extra malloc Matt Johnston <matt@ucc.asn.au> parents: 532 diff changeset	650 bufsize = MAX_MAC_LEN;
805ae74ec024 Encrypt in-place, avoid an extra malloc Matt Johnston <matt@ucc.asn.au> parents: 532 diff changeset	651 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	652 dropbear_exit("HMAC error");
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	653 }
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	654 }
731 9a5438271556 Move the more verbose TRACE() statements into TRACE2() Matt Johnston <matt@ucc.asn.au> parents: 728 diff changeset	655 TRACE2(("leave writemac"))
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	656 }
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	657
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	658 #ifndef DISABLE_ZLIB
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	659 /* 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	660 * respective current positions. */
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	661 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	662
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	663 unsigned int endpos = src->pos + len;
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	664 int result;
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	665
731 9a5438271556 Move the more verbose TRACE() statements into TRACE2() Matt Johnston <matt@ucc.asn.au> parents: 728 diff changeset	666 TRACE2(("enter buf_compress"))
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	667
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	668 while (1) {
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	669
534 0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf Matt Johnston <matt@ucc.asn.au> parents: 533 diff changeset	670 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	671 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	672 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	673
534 0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf Matt Johnston <matt@ucc.asn.au> parents: 533 diff changeset	674 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	675 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	676 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	677
534 0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf Matt Johnston <matt@ucc.asn.au> parents: 533 diff changeset	678 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	679
534 0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf Matt Johnston <matt@ucc.asn.au> parents: 533 diff changeset	680 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	681 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	682 buf_setpos(dest, dest->len);
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	683
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	684 if (result != Z_OK) {
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	685 dropbear_exit("zlib error");
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	686 }
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	687
534 0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf Matt Johnston <matt@ucc.asn.au> parents: 533 diff changeset	688 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	689 break;
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	690 }
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	691
534 0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf Matt Johnston <matt@ucc.asn.au> parents: 533 diff changeset	692 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	693
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	694 /* 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	695 * 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	696 * but it is possible */
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	697 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	698
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	699 }
731 9a5438271556 Move the more verbose TRACE() statements into TRACE2() Matt Johnston <matt@ucc.asn.au> parents: 728 diff changeset	700 TRACE2(("leave buf_compress"))
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	701 }
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	702 #endif

Mercurial > dropbear

annotate packet.c @ 891:e78f5ce6e7bb