dropbear: packet.c annotate

annotate packet.c @ 1324:871698dd3669

Merge pull request #26 from fperrad/kill_kr remove K&R old style code

author	Matt Johnston <matt@ucc.asn.au>
date	Fri, 18 Nov 2016 22:48:50 +0800
parents	9169e4e7cbee
children	b28624698130 06d52bcb8094

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"
1032 0da8ba489c23 Move generic network routines to netio.c Matt Johnston <matt@ucc.asn.au> parents: 1027 diff changeset	37 #include "netio.h"
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	38
1276 9169e4e7cbee fix empty C prototypes Francois Perrad <francois.perrad@gadz.org> parents: 1250 diff changeset	39 static int read_packet_init(void);
534 0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf Matt Johnston <matt@ucc.asn.au> parents: 533 diff changeset	40 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	41 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	42 unsigned char *output_mac);
1276 9169e4e7cbee fix empty C prototypes Francois Perrad <francois.perrad@gadz.org> parents: 1250 diff changeset	43 static int checkmac(void);
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	44
906 4696755c4cac A few fixes for cases where compression increases payload sizes, and Matt Johnston <matt@ucc.asn.au> parents: 858 diff changeset	45 /* For exact details see http://www.zlib.net/zlib_tech.html
4696755c4cac A few fixes for cases where compression increases payload sizes, and Matt Johnston <matt@ucc.asn.au> parents: 858 diff changeset	46 * 5 bytes per 16kB block, plus 6 bytes for the stream.
4696755c4cac A few fixes for cases where compression increases payload sizes, and Matt Johnston <matt@ucc.asn.au> parents: 858 diff changeset	47 * We might allocate 5 unnecessary bytes here if it's an
4696755c4cac A few fixes for cases where compression increases payload sizes, and Matt Johnston <matt@ucc.asn.au> parents: 858 diff changeset	48 * exact multiple. */
4696755c4cac A few fixes for cases where compression increases payload sizes, and Matt Johnston <matt@ucc.asn.au> parents: 858 diff changeset	49 #define ZLIB_COMPRESS_EXPANSION (((RECV_MAX_PAYLOAD_LEN/16384)+1)*5 + 6)
791 0bf76f54de6f Limit decompressed size Matt Johnston <matt@ucc.asn.au> parents: 753 diff changeset	50 #define ZLIB_DECOMPRESS_INCR 1024
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	51 #ifndef DISABLE_ZLIB
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	52 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	53 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	54 #endif
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	55
531 164b7c2cd5df disapproval of revision 'a101cbd046507cf723e6362a49196dbd4b924042' Matt Johnston <matt@ucc.asn.au> parents: 529 diff changeset	56 /* non-blocking function writing out a current encrypted packet */
164b7c2cd5df disapproval of revision 'a101cbd046507cf723e6362a49196dbd4b924042' Matt Johnston <matt@ucc.asn.au> parents: 529 diff changeset	57 void write_packet() {
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	58
1024 aac0095dc3b4 work in progress for async connect Matt Johnston <matt@ucc.asn.au> parents: 990 diff changeset	59 ssize_t written;
728 f27058078d61 Try using writev() for writing packets out to tcp Matt Johnston <matt@ucc.asn.au> parents: 711 diff changeset	60 #ifdef HAVE_WRITEV
1072 686cd3e8e13e avoid malloc for iovec Matt Johnston <matt@ucc.asn.au> parents: 1057 diff changeset	61 /* 50 is somewhat arbitrary */
1074 10f198d4a308 Make main socket nonblocking. Limit writequeue size. Matt Johnston <matt@ucc.asn.au> parents: 1072 diff changeset	62 unsigned int iov_count = 50;
1072 686cd3e8e13e avoid malloc for iovec Matt Johnston <matt@ucc.asn.au> parents: 1057 diff changeset	63 struct iovec iov[50];
1079 acf444bcb115 Fix no-writev fallback Matt Johnston <matt@ucc.asn.au> parents: 1074 diff changeset	64 #else
acf444bcb115 Fix no-writev fallback Matt Johnston <matt@ucc.asn.au> parents: 1074 diff changeset	65 int len;
acf444bcb115 Fix no-writev fallback Matt Johnston <matt@ucc.asn.au> parents: 1074 diff changeset	66 buffer* writebuf;
acf444bcb115 Fix no-writev fallback Matt Johnston <matt@ucc.asn.au> parents: 1074 diff changeset	67 int packet_type;
728 f27058078d61 Try using writev() for writing packets out to tcp Matt Johnston <matt@ucc.asn.au> parents: 711 diff changeset	68 #endif
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	69
731 9a5438271556 Move the more verbose TRACE() statements into TRACE2() Matt Johnston <matt@ucc.asn.au> parents: 728 diff changeset	70 TRACE2(("enter write_packet"))
531 164b7c2cd5df disapproval of revision 'a101cbd046507cf723e6362a49196dbd4b924042' Matt Johnston <matt@ucc.asn.au> parents: 529 diff changeset	71 dropbear_assert(!isempty(&ses.writequeue));
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	72
934 68723d66dec6 Be more careful in case a platform doesn't define UIO_MAXIOV nor IOV_MAX Matt Johnston <matt@ucc.asn.au> parents: 933 diff changeset	73 #if defined(HAVE_WRITEV) && (defined(IOV_MAX) \|\| defined(UIO_MAXIOV))
933 c919dbb39395 Limit size of the iovect passed to writev in packet.c Ronny Meeus <ronny.meeus@gmail.com> parents: 932 diff changeset	74
1072 686cd3e8e13e avoid malloc for iovec Matt Johnston <matt@ucc.asn.au> parents: 1057 diff changeset	75 packet_queue_to_iovec(&ses.writequeue, iov, &iov_count);
957 c4f138dae2fd Test for EAGAIN too Matt Johnston <matt@ucc.asn.au> parents: 939 diff changeset	76 /* This may return EAGAIN. The main loop sometimes
c4f138dae2fd Test for EAGAIN too Matt Johnston <matt@ucc.asn.au> parents: 939 diff changeset	77 calls write_packet() without bothering to test with select() since
c4f138dae2fd Test for EAGAIN too Matt Johnston <matt@ucc.asn.au> parents: 939 diff changeset	78 it's likely to be necessary */
1026 59a1146e8b9d generalise write iovec handling Matt Johnston <matt@ucc.asn.au> parents: 1025 diff changeset	79 written = writev(ses.sock_out, iov, iov_count);
728 f27058078d61 Try using writev() for writing packets out to tcp Matt Johnston <matt@ucc.asn.au> parents: 711 diff changeset	80 if (written < 0) {
957 c4f138dae2fd Test for EAGAIN too Matt Johnston <matt@ucc.asn.au> parents: 939 diff changeset	81 if (errno == EINTR \|\| errno == EAGAIN) {
1026 59a1146e8b9d generalise write iovec handling Matt Johnston <matt@ucc.asn.au> parents: 1025 diff changeset	82 TRACE2(("leave write_packet: EINTR"))
728 f27058078d61 Try using writev() for writing packets out to tcp Matt Johnston <matt@ucc.asn.au> parents: 711 diff changeset	83 return;
f27058078d61 Try using writev() for writing packets out to tcp Matt Johnston <matt@ucc.asn.au> parents: 711 diff changeset	84 } else {
932 3873b39c4de6 Print errno information in write_packet Ronny Meeus <ronny.meeus@gmail.com> parents: 928 diff changeset	85 dropbear_exit("Error writing: %s", strerror(errno));
728 f27058078d61 Try using writev() for writing packets out to tcp Matt Johnston <matt@ucc.asn.au> parents: 711 diff changeset	86 }
926 b8208506322e Use AUTH_TIMEOUT only before authdone != 1. Yousong Zhou <yszhou4tech@gmail.com> parents: 906 diff changeset	87 }
1026 59a1146e8b9d generalise write iovec handling Matt Johnston <matt@ucc.asn.au> parents: 1025 diff changeset	88
59a1146e8b9d generalise write iovec handling Matt Johnston <matt@ucc.asn.au> parents: 1025 diff changeset	89 packet_queue_consume(&ses.writequeue, written);
1074 10f198d4a308 Make main socket nonblocking. Limit writequeue size. Matt Johnston <matt@ucc.asn.au> parents: 1072 diff changeset	90 ses.writequeue_len -= written;
728 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 if (written == 0) {
f27058078d61 Try using writev() for writing packets out to tcp Matt Johnston <matt@ucc.asn.au> parents: 711 diff changeset	93 ses.remoteclosed();
f27058078d61 Try using writev() for writing packets out to tcp Matt Johnston <matt@ucc.asn.au> parents: 711 diff changeset	94 }
f27058078d61 Try using writev() for writing packets out to tcp Matt Johnston <matt@ucc.asn.au> parents: 711 diff changeset	95
934 68723d66dec6 Be more careful in case a platform doesn't define UIO_MAXIOV nor IOV_MAX Matt Johnston <matt@ucc.asn.au> parents: 933 diff changeset	96 #else /* No writev () */
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	97 /* 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	98 writebuf = (buffer*)examine(&ses.writequeue);
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	99
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	100 /* 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	101 * 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	102 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	103 len = writebuf->len - 1 - writebuf->pos;
1079 acf444bcb115 Fix no-writev fallback Matt Johnston <matt@ucc.asn.au> parents: 1074 diff changeset	104 TRACE2(("write_packet type %d len %d/%d", packet_type,
acf444bcb115 Fix no-writev fallback Matt Johnston <matt@ucc.asn.au> parents: 1074 diff changeset	105 len, writebuf->len-1))
241 c5d3ef11155f * use own assertions which should get logged properly Matt Johnston <matt@ucc.asn.au> parents: 232 diff changeset	106 dropbear_assert(len > 0);
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	107 /* 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	108 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	109
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	110 if (written < 0) {
957 c4f138dae2fd Test for EAGAIN too Matt Johnston <matt@ucc.asn.au> parents: 939 diff changeset	111 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	112 TRACE2(("leave writepacket: EINTR"))
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	113 return;
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	114 } else {
932 3873b39c4de6 Print errno information in write_packet Ronny Meeus <ronny.meeus@gmail.com> parents: 928 diff changeset	115 dropbear_exit("Error writing: %s", strerror(errno));
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	116 }
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	117 }
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	118
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	119 if (written == 0) {
33 f789045062e6 Progressing client support Matt Johnston <matt@ucc.asn.au> parents: 27 diff changeset	120 ses.remoteclosed();
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	121 }
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	122
1074 10f198d4a308 Make main socket nonblocking. Limit writequeue size. Matt Johnston <matt@ucc.asn.au> parents: 1072 diff changeset	123 ses.writequeue_len -= written;
10f198d4a308 Make main socket nonblocking. Limit writequeue size. Matt Johnston <matt@ucc.asn.au> parents: 1072 diff changeset	124
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	125 if (written == len) {
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	126 /* 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	127 dequeue(&ses.writequeue);
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	128 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	129 writebuf = NULL;
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	130 } else {
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	131 /* 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	132 buf_incrpos(writebuf, written);
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	133 }
934 68723d66dec6 Be more careful in case a platform doesn't define UIO_MAXIOV nor IOV_MAX Matt Johnston <matt@ucc.asn.au> parents: 933 diff changeset	134 #endif /* writev */
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	135
731 9a5438271556 Move the more verbose TRACE() statements into TRACE2() Matt Johnston <matt@ucc.asn.au> parents: 728 diff changeset	136 TRACE2(("leave write_packet"))
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 /* 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	140 * 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	141 * full portion if possible */
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	142 void read_packet() {
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	143
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	144 int len;
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	145 unsigned int maxlen;
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	146 unsigned char blocksize;
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	147
731 9a5438271556 Move the more verbose TRACE() statements into TRACE2() Matt Johnston <matt@ucc.asn.au> parents: 728 diff changeset	148 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	149 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	150
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	151 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	152 int ret;
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	153 /* In the first blocksize of a packet */
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	154
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	155 /* 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	156 * 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	157 ret = read_packet_init();
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	158
534 0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf Matt Johnston <matt@ucc.asn.au> parents: 533 diff changeset	159 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	160 /* 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	161 TRACE2(("leave read_packet: packetinit done"))
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	162 return;
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	163 }
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
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	166 /* 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	167 * mightn't be any available (EAGAIN) */
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	168 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	169 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	170 /* 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	171 * 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	172 */
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	173 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	174 } 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	175 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	176
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	177 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	178 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	179 }
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	180
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	181 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	182 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	183 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	184 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	185 } 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	186 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	187 }
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	188 }
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	189
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 buf_incrpos(ses.readbuf, len);
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	191 }
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	192
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	193 if ((unsigned int)len == maxlen) {
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	194 /* The whole packet has been read */
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	195 decrypt_packet();
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	196 /* The main select() loop process_packet() to
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	197 * handle the packet contents... */
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	198 }
731 9a5438271556 Move the more verbose TRACE() statements into TRACE2() Matt Johnston <matt@ucc.asn.au> parents: 728 diff changeset	199 TRACE2(("leave read_packet"))
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	200 }
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	201
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	202 /* 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	203 * 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	204 /* 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	205 * DROPBEAR_FAILURE otherwise */
0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf Matt Johnston <matt@ucc.asn.au> parents: 533 diff changeset	206 static int read_packet_init() {
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	207
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	208 unsigned int maxlen;
568 005530560594 Rearrange getaddrstring() etc Matt Johnston <matt@ucc.asn.au> parents: 556 diff changeset	209 int slen;
005530560594 Rearrange getaddrstring() etc Matt Johnston <matt@ucc.asn.au> parents: 556 diff changeset	210 unsigned int len;
005530560594 Rearrange getaddrstring() etc Matt Johnston <matt@ucc.asn.au> parents: 556 diff changeset	211 unsigned int blocksize;
005530560594 Rearrange getaddrstring() etc Matt Johnston <matt@ucc.asn.au> parents: 556 diff changeset	212 unsigned int macsize;
27 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
534 0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf Matt Johnston <matt@ucc.asn.au> parents: 533 diff changeset	215 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	216 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	217
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	218 if (ses.readbuf == NULL) {
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	219 /* start of a new packet */
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	220 ses.readbuf = buf_new(INIT_READBUF);
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 maxlen = blocksize - ses.readbuf->pos;
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	224
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	225 /* read the rest of the packet if possible */
568 005530560594 Rearrange getaddrstring() etc Matt Johnston <matt@ucc.asn.au> parents: 556 diff changeset	226 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	227 maxlen);
568 005530560594 Rearrange getaddrstring() etc Matt Johnston <matt@ucc.asn.au> parents: 556 diff changeset	228 if (slen == 0) {
33 f789045062e6 Progressing client support Matt Johnston <matt@ucc.asn.au> parents: 27 diff changeset	229 ses.remoteclosed();
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	230 }
568 005530560594 Rearrange getaddrstring() etc Matt Johnston <matt@ucc.asn.au> parents: 556 diff changeset	231 if (slen < 0) {
957 c4f138dae2fd Test for EAGAIN too Matt Johnston <matt@ucc.asn.au> parents: 939 diff changeset	232 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	233 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	234 return DROPBEAR_FAILURE;
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	235 }
594 a98a2138364a Improve capitalisation for all logged strings Matt Johnston <matt@ucc.asn.au> parents: 592 diff changeset	236 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	237 }
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	238
568 005530560594 Rearrange getaddrstring() etc Matt Johnston <matt@ucc.asn.au> parents: 556 diff changeset	239 buf_incrwritepos(ses.readbuf, slen);
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	240
568 005530560594 Rearrange getaddrstring() etc Matt Johnston <matt@ucc.asn.au> parents: 556 diff changeset	241 if ((unsigned int)slen != maxlen) {
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	242 /* 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	243 return DROPBEAR_FAILURE;
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	244 }
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 /* 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	247 * 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	248 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	249 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	250 buf_getwriteptr(ses.readbuf, blocksize),
502 43bbe17d6ba0 - Add Counter Mode support Matt Johnston <matt@ucc.asn.au> parents: 501 diff changeset	251 blocksize,
534 0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf Matt Johnston <matt@ucc.asn.au> parents: 533 diff changeset	252 &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	253 dropbear_exit("Error decrypting");
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	254 }
534 0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf Matt Johnston <matt@ucc.asn.au> parents: 533 diff changeset	255 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	256
990 e3614649b1f5 Integrity error (bad packet size %u) negative length Fedor Brunner <fedor.brunner@azet.sk> parents: 957 diff changeset	257 TRACE2(("packet size is %u, block %u mac %u", 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	258
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	259
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	260 /* 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	261 if ((len > RECV_MAX_PACKET_LEN) \|\|
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	262 (len < MIN_PACKET_LEN + macsize) \|\|
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	263 ((len - macsize) % blocksize != 0)) {
990 e3614649b1f5 Integrity error (bad packet size %u) negative length Fedor Brunner <fedor.brunner@azet.sk> parents: 957 diff changeset	264 dropbear_exit("Integrity error (bad packet size %u)", len);
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
534 0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf Matt Johnston <matt@ucc.asn.au> parents: 533 diff changeset	267 if (len > ses.readbuf->size) {
1057 16584026a1f0 allocate buffer and data in a single allocation Matt Johnston <matt@ucc.asn.au> parents: 1055 diff changeset	268 ses.readbuf = buf_resize(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	269 }
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	270 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	271 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	272 return DROPBEAR_SUCCESS;
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	273 }
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	274
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	275 /* handle the received packet */
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	276 void decrypt_packet() {
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	277
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	278 unsigned char blocksize;
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	279 unsigned char macsize;
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	280 unsigned int padlen;
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	281 unsigned int len;
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	282
731 9a5438271556 Move the more verbose TRACE() statements into TRACE2() Matt Johnston <matt@ucc.asn.au> parents: 728 diff changeset	283 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	284 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	285 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	286
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	287 ses.kexstate.datarecv += ses.readbuf->len;
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	288
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	289 /* 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	290 buf_setpos(ses.readbuf, blocksize);
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	291
534 0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf Matt Johnston <matt@ucc.asn.au> parents: 533 diff changeset	292 /* 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	293 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	294 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	295 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	296 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	297 len,
534 0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf Matt Johnston <matt@ucc.asn.au> parents: 533 diff changeset	298 &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	299 dropbear_exit("Error decrypting");
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	300 }
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	301 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	302
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	303 /* 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	304 if (checkmac() != DROPBEAR_SUCCESS) {
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	305 dropbear_exit("Integrity error");
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	306 }
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 /* 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	309 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	310 padlen = buf_getbyte(ses.readbuf);
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	311
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	312 /* payload length */
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	313 /* - 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	314 len = ses.readbuf->len - padlen - 4 - 1 - macsize;
906 4696755c4cac A few fixes for cases where compression increases payload sizes, and Matt Johnston <matt@ucc.asn.au> parents: 858 diff changeset	315 if ((len > RECV_MAX_PAYLOAD_LEN+ZLIB_COMPRESS_EXPANSION) \|\| (len < 1)) {
990 e3614649b1f5 Integrity error (bad packet size %u) negative length Fedor Brunner <fedor.brunner@azet.sk> parents: 957 diff changeset	316 dropbear_exit("Bad packet size %u", len);
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	317 }
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	318
534 0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf Matt Johnston <matt@ucc.asn.au> parents: 533 diff changeset	319 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	320
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	321 #ifndef DISABLE_ZLIB
501 d58c478bd399 Add support for [email protected] delayed compression. Matt Johnston <matt@ucc.asn.au> parents: 479 diff changeset	322 if (is_compress_recv()) {
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	323 /* decompress */
534 0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf Matt Johnston <matt@ucc.asn.au> parents: 533 diff changeset	324 ses.payload = buf_decompress(ses.readbuf, len);
1055 4d7b4c5526c5 A bit of a bodge to avoid memcpy if zlib is disabled Matt Johnston <matt@ucc.asn.au> parents: 1032 diff changeset	325 buf_setpos(ses.payload, 0);
4d7b4c5526c5 A bit of a bodge to avoid memcpy if zlib is disabled Matt Johnston <matt@ucc.asn.au> parents: 1032 diff changeset	326 ses.payload_beginning = 0;
4d7b4c5526c5 A bit of a bodge to avoid memcpy if zlib is disabled Matt Johnston <matt@ucc.asn.au> parents: 1032 diff changeset	327 buf_free(ses.readbuf);
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	328 } else
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	329 #endif
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	330 {
1055 4d7b4c5526c5 A bit of a bodge to avoid memcpy if zlib is disabled Matt Johnston <matt@ucc.asn.au> parents: 1032 diff changeset	331 ses.payload = ses.readbuf;
4d7b4c5526c5 A bit of a bodge to avoid memcpy if zlib is disabled Matt Johnston <matt@ucc.asn.au> parents: 1032 diff changeset	332 ses.payload_beginning = ses.payload->pos;
4d7b4c5526c5 A bit of a bodge to avoid memcpy if zlib is disabled Matt Johnston <matt@ucc.asn.au> parents: 1032 diff changeset	333 buf_setlen(ses.payload, ses.payload->pos + len);
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	334 /* copy payload */
1055 4d7b4c5526c5 A bit of a bodge to avoid memcpy if zlib is disabled Matt Johnston <matt@ucc.asn.au> parents: 1032 diff changeset	335 //ses.payload = buf_new(len);
4d7b4c5526c5 A bit of a bodge to avoid memcpy if zlib is disabled Matt Johnston <matt@ucc.asn.au> parents: 1032 diff changeset	336 //memcpy(ses.payload->data, buf_getptr(ses.readbuf, len), len);
4d7b4c5526c5 A bit of a bodge to avoid memcpy if zlib is disabled Matt Johnston <matt@ucc.asn.au> parents: 1032 diff changeset	337 //buf_incrlen(ses.payload, len);
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	338 }
534 0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf Matt Johnston <matt@ucc.asn.au> parents: 533 diff changeset	339 ses.readbuf = NULL;
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	340
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	341 ses.recvseq++;
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	342
731 9a5438271556 Move the more verbose TRACE() statements into TRACE2() Matt Johnston <matt@ucc.asn.au> parents: 728 diff changeset	343 TRACE2(("leave decrypt_packet"))
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	344 }
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	345
534 0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf Matt Johnston <matt@ucc.asn.au> parents: 533 diff changeset	346 /* 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	347 * 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	348 static int checkmac() {
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	349
534 0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf Matt Johnston <matt@ucc.asn.au> parents: 533 diff changeset	350 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	351 unsigned int mac_size, contents_len;
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	352
752 24172f555f9c Fix MAC bug which would prevent asymmetric hashes Matt Johnston <matt@ucc.asn.au> parents: 731 diff changeset	353 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	354 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	355
534 0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf Matt Johnston <matt@ucc.asn.au> parents: 533 diff changeset	356 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	357 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	358
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	359 /* 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	360 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	361 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	362 return DROPBEAR_FAILURE;
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	363 } else {
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	364 return DROPBEAR_SUCCESS;
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	365 }
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	366 }
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	367
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	368 #ifndef DISABLE_ZLIB
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	369 /* 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	370 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	371
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	372 int result;
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	373 buffer * ret;
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	374 z_streamp zstream;
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	375
534 0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf Matt Johnston <matt@ucc.asn.au> parents: 533 diff changeset	376 zstream = ses.keys->recv.zstream;
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	377 ret = buf_new(len);
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	378
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	379 zstream->avail_in = len;
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	380 zstream->next_in = buf_getptr(buf, len);
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	381
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	382 /* 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	383 while (1) {
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 zstream->avail_out = ret->size - ret->pos;
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	386 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	387
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	388 result = inflate(zstream, Z_SYNC_FLUSH);
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 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	391 buf_setpos(ret, ret->len);
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	392
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	393 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	394 dropbear_exit("zlib error");
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	395 }
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 if (zstream->avail_in == 0 &&
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	398 (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	399 /* 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	400 * and there's no remaining input */
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	401 return ret;
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
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	404 if (zstream->avail_out == 0) {
791 0bf76f54de6f Limit decompressed size Matt Johnston <matt@ucc.asn.au> parents: 753 diff changeset	405 int new_size = 0;
0bf76f54de6f Limit decompressed size Matt Johnston <matt@ucc.asn.au> parents: 753 diff changeset	406 if (ret->size >= RECV_MAX_PAYLOAD_LEN) {
906 4696755c4cac A few fixes for cases where compression increases payload sizes, and Matt Johnston <matt@ucc.asn.au> parents: 858 diff changeset	407 /* Already been increased as large as it can go,
4696755c4cac A few fixes for cases where compression increases payload sizes, and Matt Johnston <matt@ucc.asn.au> parents: 858 diff changeset	408 * yet didn't finish up the decompression */
791 0bf76f54de6f Limit decompressed size Matt Johnston <matt@ucc.asn.au> parents: 753 diff changeset	409 dropbear_exit("bad packet, oversized decompressed");
0bf76f54de6f Limit decompressed size Matt Johnston <matt@ucc.asn.au> parents: 753 diff changeset	410 }
0bf76f54de6f Limit decompressed size Matt Johnston <matt@ucc.asn.au> parents: 753 diff changeset	411 new_size = MIN(RECV_MAX_PAYLOAD_LEN, ret->size + ZLIB_DECOMPRESS_INCR);
1057 16584026a1f0 allocate buffer and data in a single allocation Matt Johnston <matt@ucc.asn.au> parents: 1055 diff changeset	412 ret = buf_resize(ret, new_size);
27 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 }
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	416 #endif
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	417
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	418
452 4cab61369879 Prevent invalid packets being sent during key-exchange, instead queue Matt Johnston <matt@ucc.asn.au> parents: 448 diff changeset	419 /* 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	420 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	421 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	422 return 0;
4cab61369879 Prevent invalid packets being sent during key-exchange, instead queue Matt Johnston <matt@ucc.asn.au> parents: 448 diff changeset	423 }
4cab61369879 Prevent invalid packets being sent during key-exchange, instead queue Matt Johnston <matt@ucc.asn.au> parents: 448 diff changeset	424 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	425 return 0;
4cab61369879 Prevent invalid packets being sent during key-exchange, instead queue Matt Johnston <matt@ucc.asn.au> parents: 448 diff changeset	426 }
4cab61369879 Prevent invalid packets being sent during key-exchange, instead queue Matt Johnston <matt@ucc.asn.au> parents: 448 diff changeset	427 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	428 /* 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	429 return 0;
4cab61369879 Prevent invalid packets being sent during key-exchange, instead queue Matt Johnston <matt@ucc.asn.au> parents: 448 diff changeset	430 }
4cab61369879 Prevent invalid packets being sent during key-exchange, instead queue Matt Johnston <matt@ucc.asn.au> parents: 448 diff changeset	431 return 1;
4cab61369879 Prevent invalid packets being sent during key-exchange, instead queue Matt Johnston <matt@ucc.asn.au> parents: 448 diff changeset	432 }
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	433
452 4cab61369879 Prevent invalid packets being sent during key-exchange, instead queue Matt Johnston <matt@ucc.asn.au> parents: 448 diff changeset	434 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	435 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	436 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	437 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	438
4cab61369879 Prevent invalid packets being sent during key-exchange, instead queue Matt Johnston <matt@ucc.asn.au> parents: 448 diff changeset	439 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	440 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	441 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	442
4cab61369879 Prevent invalid packets being sent during key-exchange, instead queue Matt Johnston <matt@ucc.asn.au> parents: 448 diff changeset	443 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	444 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	445 } else {
4cab61369879 Prevent invalid packets being sent during key-exchange, instead queue Matt Johnston <matt@ucc.asn.au> parents: 448 diff changeset	446 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	447 }
456 f6c999ba31da Fix delayed packet queue handling Matt Johnston <matt@ucc.asn.au> parents: 454 diff changeset	448 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	449 }
4cab61369879 Prevent invalid packets being sent during key-exchange, instead queue Matt Johnston <matt@ucc.asn.au> parents: 448 diff changeset	450
4cab61369879 Prevent invalid packets being sent during key-exchange, instead queue Matt Johnston <matt@ucc.asn.au> parents: 448 diff changeset	451 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	452 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	453 if (!ses.dataallowed)
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 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	456 return;
4cab61369879 Prevent invalid packets being sent during key-exchange, instead queue Matt Johnston <matt@ucc.asn.au> parents: 448 diff changeset	457 }
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 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	460 CHECKCLEARTOWRITE();
4cab61369879 Prevent invalid packets being sent during key-exchange, instead queue Matt Johnston <matt@ucc.asn.au> parents: 448 diff changeset	461 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	462 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	463
4cab61369879 Prevent invalid packets being sent during key-exchange, instead queue Matt Johnston <matt@ucc.asn.au> parents: 448 diff changeset	464 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	465 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	466 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	467 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	468 encrypt_packet();
4cab61369879 Prevent invalid packets being sent during key-exchange, instead queue Matt Johnston <matt@ucc.asn.au> parents: 448 diff changeset	469 }
4cab61369879 Prevent invalid packets being sent during key-exchange, instead queue Matt Johnston <matt@ucc.asn.au> parents: 448 diff changeset	470 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	471 }
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	472
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	473 /* 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	474 * to put on the wire */
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	475 void encrypt_packet() {
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	476
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	477 unsigned char padlen;
533 805ae74ec024 Encrypt in-place, avoid an extra malloc Matt Johnston <matt@ucc.asn.au> parents: 532 diff changeset	478 unsigned char blocksize, mac_size;
805ae74ec024 Encrypt in-place, avoid an extra malloc Matt Johnston <matt@ucc.asn.au> parents: 532 diff changeset	479 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	480 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	481 unsigned char packet_type;
533 805ae74ec024 Encrypt in-place, avoid an extra malloc Matt Johnston <matt@ucc.asn.au> parents: 532 diff changeset	482 unsigned int len, encrypt_buf_size;
805ae74ec024 Encrypt in-place, avoid an extra malloc Matt Johnston <matt@ucc.asn.au> parents: 532 diff changeset	483 unsigned char mac_bytes[MAX_MAC_LEN];
939 a0819ecfee0b Make -K keepalive behave like OpenSSH's ServerAliveInterval Matt Johnston <matt@ucc.asn.au> parents: 934 diff changeset	484
a0819ecfee0b Make -K keepalive behave like OpenSSH's ServerAliveInterval Matt Johnston <matt@ucc.asn.au> parents: 934 diff changeset	485 time_t now;
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	486
731 9a5438271556 Move the more verbose TRACE() statements into TRACE2() Matt Johnston <matt@ucc.asn.au> parents: 728 diff changeset	487 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	488
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	489 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	490 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	491 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	492
731 9a5438271556 Move the more verbose TRACE() statements into TRACE2() Matt Johnston <matt@ucc.asn.au> parents: 728 diff changeset	493 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	494
752 24172f555f9c Fix MAC bug which would prevent asymmetric hashes Matt Johnston <matt@ucc.asn.au> parents: 731 diff changeset	495 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	496 /* 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	497 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	498 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	499 enqueue_reply_packet();
4cab61369879 Prevent invalid packets being sent during key-exchange, instead queue Matt Johnston <matt@ucc.asn.au> parents: 448 diff changeset	500 return;
4cab61369879 Prevent invalid packets being sent during key-exchange, instead queue Matt Johnston <matt@ucc.asn.au> parents: 448 diff changeset	501 }
4cab61369879 Prevent invalid packets being sent during key-exchange, instead queue Matt Johnston <matt@ucc.asn.au> parents: 448 diff changeset	502
534 0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf Matt Johnston <matt@ucc.asn.au> parents: 533 diff changeset	503 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	504 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	505
605 53c21d4ec98a - Don't allow setting memLevel since that doesn't work properly Matt Johnston <matt@ucc.asn.au> parents: 594 diff changeset	506 /* 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	507 * 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	508 * 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	509 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	510 + 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	511 /* 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	512 + 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	513 #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	514 /* some extra in case 'compression' makes it larger */
906 4696755c4cac A few fixes for cases where compression increases payload sizes, and Matt Johnston <matt@ucc.asn.au> parents: 858 diff changeset	515 + ZLIB_COMPRESS_EXPANSION
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	516 #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	517 /* 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	518 * 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	519 + 1;
501 d58c478bd399 Add support for [email protected] delayed compression. Matt Johnston <matt@ucc.asn.au> parents: 479 diff changeset	520
533 805ae74ec024 Encrypt in-place, avoid an extra malloc Matt Johnston <matt@ucc.asn.au> parents: 532 diff changeset	521 writebuf = buf_new(encrypt_buf_size);
805ae74ec024 Encrypt in-place, avoid an extra malloc Matt Johnston <matt@ucc.asn.au> parents: 532 diff changeset	522 buf_setlen(writebuf, PACKET_PAYLOAD_OFF);
805ae74ec024 Encrypt in-place, avoid an extra malloc Matt Johnston <matt@ucc.asn.au> parents: 532 diff changeset	523 buf_setpos(writebuf, PACKET_PAYLOAD_OFF);
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	524
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	525 #ifndef DISABLE_ZLIB
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	526 /* compression */
501 d58c478bd399 Add support for [email protected] delayed compression. Matt Johnston <matt@ucc.asn.au> parents: 479 diff changeset	527 if (is_compress_trans()) {
533 805ae74ec024 Encrypt in-place, avoid an extra malloc Matt Johnston <matt@ucc.asn.au> parents: 532 diff changeset	528 buf_compress(writebuf, ses.writepayload, ses.writepayload->len);
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	529 } else
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	530 #endif
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	531 {
533 805ae74ec024 Encrypt in-place, avoid an extra malloc Matt Johnston <matt@ucc.asn.au> parents: 532 diff changeset	532 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	533 buf_getptr(ses.writepayload, ses.writepayload->len),
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	534 ses.writepayload->len);
533 805ae74ec024 Encrypt in-place, avoid an extra malloc Matt Johnston <matt@ucc.asn.au> parents: 532 diff changeset	535 buf_incrwritepos(writebuf, ses.writepayload->len);
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	536 }
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	537
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	538 /* finished with payload */
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	539 buf_setpos(ses.writepayload, 0);
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	540 buf_setlen(ses.writepayload, 0);
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	541
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	542 /* 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	543 * 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	544 padlen = blocksize - (writebuf->len) % blocksize;
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	545 if (padlen < 4) {
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	546 padlen += blocksize;
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	547 }
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	548 /* check for min packet length */
533 805ae74ec024 Encrypt in-place, avoid an extra malloc Matt Johnston <matt@ucc.asn.au> parents: 532 diff changeset	549 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	550 padlen += blocksize;
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	551 }
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 buf_setpos(writebuf, 0);
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	554 /* 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	555 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	556
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	557 /* padding len */
533 805ae74ec024 Encrypt in-place, avoid an extra malloc Matt Johnston <matt@ucc.asn.au> parents: 532 diff changeset	558 buf_putbyte(writebuf, padlen);
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	559 /* actual padding */
533 805ae74ec024 Encrypt in-place, avoid an extra malloc Matt Johnston <matt@ucc.asn.au> parents: 532 diff changeset	560 buf_setpos(writebuf, writebuf->len);
805ae74ec024 Encrypt in-place, avoid an extra malloc Matt Johnston <matt@ucc.asn.au> parents: 532 diff changeset	561 buf_incrlen(writebuf, padlen);
805ae74ec024 Encrypt in-place, avoid an extra malloc Matt Johnston <matt@ucc.asn.au> parents: 532 diff changeset	562 genrandom(buf_getptr(writebuf, padlen), padlen);
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	563
534 0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf Matt Johnston <matt@ucc.asn.au> parents: 533 diff changeset	564 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	565
533 805ae74ec024 Encrypt in-place, avoid an extra malloc Matt Johnston <matt@ucc.asn.au> parents: 532 diff changeset	566 /* do the actual encryption, in-place */
805ae74ec024 Encrypt in-place, avoid an extra malloc Matt Johnston <matt@ucc.asn.au> parents: 532 diff changeset	567 buf_setpos(writebuf, 0);
805ae74ec024 Encrypt in-place, avoid an extra malloc Matt Johnston <matt@ucc.asn.au> parents: 532 diff changeset	568 /* encrypt it in-place*/
805ae74ec024 Encrypt in-place, avoid an extra malloc Matt Johnston <matt@ucc.asn.au> parents: 532 diff changeset	569 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	570 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	571 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	572 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	573 len,
534 0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf Matt Johnston <matt@ucc.asn.au> parents: 533 diff changeset	574 &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	575 dropbear_exit("Error encrypting");
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	576 }
533 805ae74ec024 Encrypt in-place, avoid an extra malloc Matt Johnston <matt@ucc.asn.au> parents: 532 diff changeset	577 buf_incrpos(writebuf, len);
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	578
1250 2bb4c662d1c2 more hard tab Francois Perrad <francois.perrad@gadz.org> parents: 1249 diff changeset	579 /* stick the MAC on it */
2bb4c662d1c2 more hard tab Francois Perrad <francois.perrad@gadz.org> parents: 1249 diff changeset	580 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	581
1074 10f198d4a308 Make main socket nonblocking. Limit writequeue size. Matt Johnston <matt@ucc.asn.au> parents: 1072 diff changeset	582 /* Update counts */
10f198d4a308 Make main socket nonblocking. Limit writequeue size. Matt Johnston <matt@ucc.asn.au> parents: 1072 diff changeset	583 ses.kexstate.datatrans += writebuf->len;
10f198d4a308 Make main socket nonblocking. Limit writequeue size. Matt Johnston <matt@ucc.asn.au> parents: 1072 diff changeset	584
10f198d4a308 Make main socket nonblocking. Limit writequeue size. Matt Johnston <matt@ucc.asn.au> parents: 1072 diff changeset	585 writebuf_enqueue(writebuf, packet_type);
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	586
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	587 /* Update counts */
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	588 ses.transseq++;
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	589
939 a0819ecfee0b Make -K keepalive behave like OpenSSH's ServerAliveInterval Matt Johnston <matt@ucc.asn.au> parents: 934 diff changeset	590 now = monotonic_now();
a0819ecfee0b Make -K keepalive behave like OpenSSH's ServerAliveInterval Matt Johnston <matt@ucc.asn.au> parents: 934 diff changeset	591 ses.last_packet_time_any_sent = now;
a0819ecfee0b Make -K keepalive behave like OpenSSH's ServerAliveInterval Matt Johnston <matt@ucc.asn.au> parents: 934 diff changeset	592 /* idle timeout shouldn't be affected by responses to keepalives.
a0819ecfee0b Make -K keepalive behave like OpenSSH's ServerAliveInterval Matt Johnston <matt@ucc.asn.au> parents: 934 diff changeset	593 send_msg_keepalive() itself also does tricks with
a0819ecfee0b Make -K keepalive behave like OpenSSH's ServerAliveInterval Matt Johnston <matt@ucc.asn.au> parents: 934 diff changeset	594 ses.last_packet_idle_time - read that if modifying this code */
a0819ecfee0b Make -K keepalive behave like OpenSSH's ServerAliveInterval Matt Johnston <matt@ucc.asn.au> parents: 934 diff changeset	595 if (packet_type != SSH_MSG_REQUEST_FAILURE
a0819ecfee0b Make -K keepalive behave like OpenSSH's ServerAliveInterval Matt Johnston <matt@ucc.asn.au> parents: 934 diff changeset	596 && packet_type != SSH_MSG_UNIMPLEMENTED
a0819ecfee0b Make -K keepalive behave like OpenSSH's ServerAliveInterval Matt Johnston <matt@ucc.asn.au> parents: 934 diff changeset	597 && packet_type != SSH_MSG_IGNORE) {
a0819ecfee0b Make -K keepalive behave like OpenSSH's ServerAliveInterval Matt Johnston <matt@ucc.asn.au> parents: 934 diff changeset	598 ses.last_packet_time_idle = now;
a0819ecfee0b Make -K keepalive behave like OpenSSH's ServerAliveInterval Matt Johnston <matt@ucc.asn.au> parents: 934 diff changeset	599
a0819ecfee0b Make -K keepalive behave like OpenSSH's ServerAliveInterval Matt Johnston <matt@ucc.asn.au> parents: 934 diff changeset	600 }
a0819ecfee0b Make -K keepalive behave like OpenSSH's ServerAliveInterval Matt Johnston <matt@ucc.asn.au> parents: 934 diff changeset	601
731 9a5438271556 Move the more verbose TRACE() statements into TRACE2() Matt Johnston <matt@ucc.asn.au> parents: 728 diff changeset	602 TRACE2(("leave encrypt_packet()"))
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	603 }
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	604
1074 10f198d4a308 Make main socket nonblocking. Limit writequeue size. Matt Johnston <matt@ucc.asn.au> parents: 1072 diff changeset	605 void writebuf_enqueue(buffer * writebuf, unsigned char packet_type) {
10f198d4a308 Make main socket nonblocking. Limit writequeue size. Matt Johnston <matt@ucc.asn.au> parents: 1072 diff changeset	606 /* The last byte of the buffer stores the cleartext packet_type. It is not
10f198d4a308 Make main socket nonblocking. Limit writequeue size. Matt Johnston <matt@ucc.asn.au> parents: 1072 diff changeset	607 * transmitted but is used for transmit timeout purposes */
10f198d4a308 Make main socket nonblocking. Limit writequeue size. Matt Johnston <matt@ucc.asn.au> parents: 1072 diff changeset	608 buf_putbyte(writebuf, packet_type);
10f198d4a308 Make main socket nonblocking. Limit writequeue size. Matt Johnston <matt@ucc.asn.au> parents: 1072 diff changeset	609 /* enqueue the packet for sending. It will get freed after transmission. */
10f198d4a308 Make main socket nonblocking. Limit writequeue size. Matt Johnston <matt@ucc.asn.au> parents: 1072 diff changeset	610 buf_setpos(writebuf, 0);
10f198d4a308 Make main socket nonblocking. Limit writequeue size. Matt Johnston <matt@ucc.asn.au> parents: 1072 diff changeset	611 enqueue(&ses.writequeue, (void*)writebuf);
10f198d4a308 Make main socket nonblocking. Limit writequeue size. Matt Johnston <matt@ucc.asn.au> parents: 1072 diff changeset	612 ses.writequeue_len += writebuf->len-1;
10f198d4a308 Make main socket nonblocking. Limit writequeue size. Matt Johnston <matt@ucc.asn.au> parents: 1072 diff changeset	613 }
10f198d4a308 Make main socket nonblocking. Limit writequeue size. Matt Johnston <matt@ucc.asn.au> parents: 1072 diff changeset	614
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 /* 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	617 /* 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	618 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	619 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	620 unsigned char *output_mac) {
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	621 unsigned char seqbuf[4];
228 5e4110bb753a - Fixed twofish algorithm naming so it actually works. Matt Johnston <matt@ucc.asn.au> parents: 194 diff changeset	622 unsigned long bufsize;
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	623 hmac_state hmac;
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	624
534 0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf Matt Johnston <matt@ucc.asn.au> parents: 533 diff changeset	625 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	626 /* calculate the mac */
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	627 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	628 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	629 key_state->mackey,
0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf Matt Johnston <matt@ucc.asn.au> parents: 533 diff changeset	630 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	631 dropbear_exit("HMAC error");
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	632 }
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	633
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	634 /* sequence number */
534 0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf Matt Johnston <matt@ucc.asn.au> parents: 533 diff changeset	635 STORE32H(seqno, seqbuf);
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	636 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	637 dropbear_exit("HMAC error");
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	638 }
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	639
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	640 /* 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	641 buf_setpos(clear_buf, 0);
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	642 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	643 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	644 clear_len) != CRYPT_OK) {
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	645 dropbear_exit("HMAC error");
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	646 }
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	647
1249 c6346c63281b refactor indentation with hard tab Francois Perrad <francois.perrad@gadz.org> parents: 1079 diff changeset	648 bufsize = MAX_MAC_LEN;
533 805ae74ec024 Encrypt in-place, avoid an extra malloc Matt Johnston <matt@ucc.asn.au> parents: 532 diff changeset	649 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	650 dropbear_exit("HMAC error");
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	651 }
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	652 }
731 9a5438271556 Move the more verbose TRACE() statements into TRACE2() Matt Johnston <matt@ucc.asn.au> parents: 728 diff changeset	653 TRACE2(("leave writemac"))
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	654 }
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	655
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	656 #ifndef DISABLE_ZLIB
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	657 /* compresses len bytes from src, outputting to dest (starting from the
1057 16584026a1f0 allocate buffer and data in a single allocation Matt Johnston <matt@ucc.asn.au> parents: 1055 diff changeset	658 * respective current positions. dest must have sufficient space,
16584026a1f0 allocate buffer and data in a single allocation Matt Johnston <matt@ucc.asn.au> parents: 1055 diff changeset	659 * len+ZLIB_COMPRESS_EXPANSION */
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	660 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	661
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	662 unsigned int endpos = src->pos + len;
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	663 int result;
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	664
731 9a5438271556 Move the more verbose TRACE() statements into TRACE2() Matt Johnston <matt@ucc.asn.au> parents: 728 diff changeset	665 TRACE2(("enter buf_compress"))
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	666
1057 16584026a1f0 allocate buffer and data in a single allocation Matt Johnston <matt@ucc.asn.au> parents: 1055 diff changeset	667 dropbear_assert(dest->size - dest->pos >= len+ZLIB_COMPRESS_EXPANSION);
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	668
1057 16584026a1f0 allocate buffer and data in a single allocation Matt Johnston <matt@ucc.asn.au> parents: 1055 diff changeset	669 ses.keys->trans.zstream->avail_in = endpos - src->pos;
16584026a1f0 allocate buffer and data in a single allocation Matt Johnston <matt@ucc.asn.au> parents: 1055 diff changeset	670 ses.keys->trans.zstream->next_in =
16584026a1f0 allocate buffer and data in a single allocation Matt Johnston <matt@ucc.asn.au> parents: 1055 diff changeset	671 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	672
1057 16584026a1f0 allocate buffer and data in a single allocation Matt Johnston <matt@ucc.asn.au> parents: 1055 diff changeset	673 ses.keys->trans.zstream->avail_out = dest->size - dest->pos;
16584026a1f0 allocate buffer and data in a single allocation Matt Johnston <matt@ucc.asn.au> parents: 1055 diff changeset	674 ses.keys->trans.zstream->next_out =
16584026a1f0 allocate buffer and data in a single allocation Matt Johnston <matt@ucc.asn.au> parents: 1055 diff changeset	675 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	676
1057 16584026a1f0 allocate buffer and data in a single allocation Matt Johnston <matt@ucc.asn.au> parents: 1055 diff changeset	677 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	678
1057 16584026a1f0 allocate buffer and data in a single allocation Matt Johnston <matt@ucc.asn.au> parents: 1055 diff changeset	679 buf_setpos(src, endpos - ses.keys->trans.zstream->avail_in);
16584026a1f0 allocate buffer and data in a single allocation Matt Johnston <matt@ucc.asn.au> parents: 1055 diff changeset	680 buf_setlen(dest, dest->size - ses.keys->trans.zstream->avail_out);
16584026a1f0 allocate buffer and data in a single allocation Matt Johnston <matt@ucc.asn.au> parents: 1055 diff changeset	681 buf_setpos(dest, dest->len);
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	682
1057 16584026a1f0 allocate buffer and data in a single allocation Matt Johnston <matt@ucc.asn.au> parents: 1055 diff changeset	683 if (result != Z_OK) {
16584026a1f0 allocate buffer and data in a single allocation Matt Johnston <matt@ucc.asn.au> parents: 1055 diff changeset	684 dropbear_exit("zlib error");
16584026a1f0 allocate buffer and data in a single allocation Matt Johnston <matt@ucc.asn.au> parents: 1055 diff changeset	685 }
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	686
1057 16584026a1f0 allocate buffer and data in a single allocation Matt Johnston <matt@ucc.asn.au> parents: 1055 diff changeset	687 /* fails if destination buffer wasn't large enough */
16584026a1f0 allocate buffer and data in a single allocation Matt Johnston <matt@ucc.asn.au> parents: 1055 diff changeset	688 dropbear_assert(ses.keys->trans.zstream->avail_in == 0);
731 9a5438271556 Move the more verbose TRACE() statements into TRACE2() Matt Johnston <matt@ucc.asn.au> parents: 728 diff changeset	689 TRACE2(("leave buf_compress"))
27 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 #endif

Mercurial > dropbear

annotate packet.c @ 1324:871698dd3669