dropbear: packet.c annotate

annotate packet.c @ 529:da6340a60039

- Try to write out as much as we can

author	Matt Johnston <matt@ucc.asn.au>
date	Thu, 26 Feb 2009 12:18:11 +0000
parents	a3748e54273c
children	22a0d8355c2c 164b7c2cd5df

rev	line source
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1 /*
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	2 * Dropbear - a SSH2 server
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	3 *
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	4 * Copyright (c) 2002,2003 Matt Johnston
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	5 * All rights reserved.
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	6 *
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	7 * Permission is hereby granted, free of charge, to any person obtaining a copy
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	8 * of this software and associated documentation files (the "Software"), to deal
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	9 * in the Software without restriction, including without limitation the rights
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	10 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	11 * copies of the Software, and to permit persons to whom the Software is
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	12 * furnished to do so, subject to the following conditions:
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	13 *
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	14 * The above copyright notice and this permission notice shall be included in
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	15 * all copies or substantial portions of the Software.
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	16 *
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	17 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	18 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	19 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	20 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	21 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	22 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	23 * SOFTWARE. */
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	24
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	25 #include "includes.h"
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	26 #include "packet.h"
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	27 #include "session.h"
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	28 #include "dbutil.h"
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	29 #include "ssh.h"
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	30 #include "algo.h"
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	31 #include "buffer.h"
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	32 #include "kex.h"
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	33 #include "random.h"
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	34 #include "service.h"
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	35 #include "auth.h"
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	36 #include "channel.h"
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	37
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	38 static void read_packet_init();
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	39 static void writemac(buffer * outputbuffer, buffer * clearwritebuf);
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	40 static int checkmac(buffer* hashbuf, buffer* readbuf);
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	41
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	42 #define ZLIB_COMPRESS_INCR 20 /* this is 12 bytes + 0.1% of 8000 bytes */
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	43 #define ZLIB_DECOMPRESS_INCR 100
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	44 #ifndef DISABLE_ZLIB
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	45 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	46 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	47 #endif
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	48
529 da6340a60039 - Try to write out as much as we can Matt Johnston <matt@ucc.asn.au> parents: 513 diff changeset	49 /* non-blocking function writing out a current encrypted packet. Returns
da6340a60039 - Try to write out as much as we can Matt Johnston <matt@ucc.asn.au> parents: 513 diff changeset	50 * DROPBEAR_SUCCESS if entire packet was written, DROPBEAR_FAILURE
da6340a60039 - Try to write out as much as we can Matt Johnston <matt@ucc.asn.au> parents: 513 diff changeset	51 * otherwise */
da6340a60039 - Try to write out as much as we can Matt Johnston <matt@ucc.asn.au> parents: 513 diff changeset	52 static int write_packet() {
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	53
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	54 int len, written;
529 da6340a60039 - Try to write out as much as we can Matt Johnston <matt@ucc.asn.au> parents: 513 diff changeset	55 int ret = DROPBEAR_FAILURE;
70 b0316ce64e4b Merging in the changes from 0.41-0.43 main Dropbear tree Matt Johnston <matt@ucc.asn.au> parents: 33 diff changeset	56 buffer * writebuf = NULL;
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	57
165 0cfba3034be5 Fixed DEBUG_TRACE macro so that we don't get semicolons left about the place Matt Johnston <matt@ucc.asn.au> parents: 70 diff changeset	58 TRACE(("enter write_packet"))
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	59
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	60 /* 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	61 writebuf = (buffer*)examine(&ses.writequeue);
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	62
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	63 len = writebuf->len - writebuf->pos;
241 c5d3ef11155f * use own assertions which should get logged properly Matt Johnston <matt@ucc.asn.au> parents: 232 diff changeset	64 dropbear_assert(len > 0);
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	65 /* 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	66 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	67
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	68 if (written < 0) {
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	69 if (errno == EINTR) {
165 0cfba3034be5 Fixed DEBUG_TRACE macro so that we don't get semicolons left about the place Matt Johnston <matt@ucc.asn.au> parents: 70 diff changeset	70 TRACE(("leave writepacket: EINTR"))
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	71 return;
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	72 } else {
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	73 dropbear_exit("error writing");
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	74 }
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	75 }
454 7e43f5e473b9 - Add -K keepalive flag for dropbear and dbclient Matt Johnston <matt@ucc.asn.au> parents: 452 diff changeset	76
513 a3748e54273c Idle timeout patch from Farrell Aultman. Needs testing, unsure if server Matt Johnston <matt@ucc.asn.au> parents: 502 diff changeset	77 ses.last_trx_packet_time = time(NULL);
454 7e43f5e473b9 - Add -K keepalive flag for dropbear and dbclient Matt Johnston <matt@ucc.asn.au> parents: 452 diff changeset	78 ses.last_packet_time = time(NULL);
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	79
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	80 if (written == 0) {
33 f789045062e6 Progressing client support Matt Johnston <matt@ucc.asn.au> parents: 27 diff changeset	81 ses.remoteclosed();
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	82 }
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	83
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	84 if (written == len) {
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	85 /* 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	86 dequeue(&ses.writequeue);
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	87 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	88 writebuf = NULL;
529 da6340a60039 - Try to write out as much as we can Matt Johnston <matt@ucc.asn.au> parents: 513 diff changeset	89 ret = DROPBEAR_SUCCESS;
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	90 } else {
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	91 /* 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	92 buf_incrpos(writebuf, written);
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	93 }
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	94
165 0cfba3034be5 Fixed DEBUG_TRACE macro so that we don't get semicolons left about the place Matt Johnston <matt@ucc.asn.au> parents: 70 diff changeset	95 TRACE(("leave write_packet"))
529 da6340a60039 - Try to write out as much as we can Matt Johnston <matt@ucc.asn.au> parents: 513 diff changeset	96 return ret;
da6340a60039 - Try to write out as much as we can Matt Johnston <matt@ucc.asn.au> parents: 513 diff changeset	97 }
da6340a60039 - Try to write out as much as we can Matt Johnston <matt@ucc.asn.au> parents: 513 diff changeset	98
da6340a60039 - Try to write out as much as we can Matt Johnston <matt@ucc.asn.au> parents: 513 diff changeset	99 void write_packets() {
da6340a60039 - Try to write out as much as we can Matt Johnston <matt@ucc.asn.au> parents: 513 diff changeset	100 /* keep writing packets while we can. */
da6340a60039 - Try to write out as much as we can Matt Johnston <matt@ucc.asn.au> parents: 513 diff changeset	101 while (!isempty(&ses.writequeue) && write_packet() == DROPBEAR_SUCCESS) {}
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	102 }
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	103
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	104 /* 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	105 * 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	106 * full portion if possible */
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	107 void read_packet() {
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	108
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	109 int len;
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	110 unsigned int maxlen;
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	111 unsigned char blocksize;
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	112
165 0cfba3034be5 Fixed DEBUG_TRACE macro so that we don't get semicolons left about the place Matt Johnston <matt@ucc.asn.au> parents: 70 diff changeset	113 TRACE(("enter read_packet"))
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	114 blocksize = ses.keys->recv_algo_crypt->blocksize;
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	115
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	116 if (ses.readbuf == NULL \|\| ses.readbuf->len < blocksize) {
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	117 /* In the first blocksize of a packet */
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 /* 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	120 * find the length of the whole packet */
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	121 read_packet_init();
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	122
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	123 /* If we don't have the length of decryptreadbuf, we didn't read
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	124 * a whole blocksize and should exit */
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	125 if (ses.decryptreadbuf->len == 0) {
165 0cfba3034be5 Fixed DEBUG_TRACE macro so that we don't get semicolons left about the place Matt Johnston <matt@ucc.asn.au> parents: 70 diff changeset	126 TRACE(("leave read_packet: packetinit done"))
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	127 return;
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	128 }
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	129 }
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	130
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	131 /* 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	132 * mightn't be any available (EAGAIN) */
241 c5d3ef11155f * use own assertions which should get logged properly Matt Johnston <matt@ucc.asn.au> parents: 232 diff changeset	133 dropbear_assert(ses.readbuf != NULL);
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	134 maxlen = ses.readbuf->len - ses.readbuf->pos;
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	135 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	136
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	137 if (len == 0) {
33 f789045062e6 Progressing client support Matt Johnston <matt@ucc.asn.au> parents: 27 diff changeset	138 ses.remoteclosed();
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	139 }
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	140
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	141 if (len < 0) {
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	142 if (errno == EINTR \|\| errno == EAGAIN) {
165 0cfba3034be5 Fixed DEBUG_TRACE macro so that we don't get semicolons left about the place Matt Johnston <matt@ucc.asn.au> parents: 70 diff changeset	143 TRACE(("leave read_packet: EINTR or EAGAIN"))
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	144 return;
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	145 } else {
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	146 dropbear_exit("error reading: %s", strerror(errno));
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	147 }
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	148 }
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	149
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	150 buf_incrpos(ses.readbuf, len);
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	151
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	152 if ((unsigned int)len == maxlen) {
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	153 /* The whole packet has been read */
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	154 decrypt_packet();
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	155 /* The main select() loop process_packet() to
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	156 * handle the packet contents... */
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	157 }
165 0cfba3034be5 Fixed DEBUG_TRACE macro so that we don't get semicolons left about the place Matt Johnston <matt@ucc.asn.au> parents: 70 diff changeset	158 TRACE(("leave read_packet"))
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	159 }
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	160
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	161 /* 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	162 * length. Only called during the first BLOCKSIZE of a packet. */
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	163 static void read_packet_init() {
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 unsigned int maxlen;
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	166 int len;
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	167 unsigned char blocksize;
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	168 unsigned char macsize;
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	169
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	170
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	171 blocksize = ses.keys->recv_algo_crypt->blocksize;
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	172 macsize = ses.keys->recv_algo_mac->hashsize;
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	173
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	174 if (ses.readbuf == NULL) {
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	175 /* start of a new packet */
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	176 ses.readbuf = buf_new(INIT_READBUF);
241 c5d3ef11155f * use own assertions which should get logged properly Matt Johnston <matt@ucc.asn.au> parents: 232 diff changeset	177 dropbear_assert(ses.decryptreadbuf == NULL);
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	178 ses.decryptreadbuf = buf_new(blocksize);
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	179 }
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	180
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	181 maxlen = blocksize - ses.readbuf->pos;
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	182
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	183 /* read the rest of the packet if 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	184 len = 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	185 maxlen);
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	186 if (len == 0) {
33 f789045062e6 Progressing client support Matt Johnston <matt@ucc.asn.au> parents: 27 diff changeset	187 ses.remoteclosed();
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	188 }
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	189 if (len < 0) {
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	190 if (errno == EINTR) {
165 0cfba3034be5 Fixed DEBUG_TRACE macro so that we don't get semicolons left about the place Matt Johnston <matt@ucc.asn.au> parents: 70 diff changeset	191 TRACE(("leave read_packet_init: EINTR"))
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	192 return;
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	193 }
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	194 dropbear_exit("error reading: %s", strerror(errno));
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	195 }
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	196
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	197 buf_incrwritepos(ses.readbuf, len);
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	198
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	199 if ((unsigned int)len != maxlen) {
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	200 /* don't have enough bytes to determine length, get next time */
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	201 return;
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	202 }
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	203
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	204 /* 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	205 * 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	206 buf_setpos(ses.readbuf, 0);
502 43bbe17d6ba0 - Add Counter Mode support Matt Johnston <matt@ucc.asn.au> parents: 501 diff changeset	207 if (ses.keys->recv_crypt_mode->decrypt(buf_getptr(ses.readbuf, blocksize),
43bbe17d6ba0 - Add Counter Mode support Matt Johnston <matt@ucc.asn.au> parents: 501 diff changeset	208 buf_getwriteptr(ses.decryptreadbuf,blocksize),
43bbe17d6ba0 - Add Counter Mode support Matt Johnston <matt@ucc.asn.au> parents: 501 diff changeset	209 blocksize,
43bbe17d6ba0 - Add Counter Mode support Matt Johnston <matt@ucc.asn.au> parents: 501 diff changeset	210 &ses.keys->recv_cipher_state) != CRYPT_OK) {
43bbe17d6ba0 - Add Counter Mode support Matt Johnston <matt@ucc.asn.au> parents: 501 diff changeset	211 dropbear_exit("error decrypting");
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	212 }
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	213 buf_setlen(ses.decryptreadbuf, blocksize);
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	214 len = buf_getint(ses.decryptreadbuf) + 4 + macsize;
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	215
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	216 buf_setpos(ses.readbuf, blocksize);
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 /* 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	219 if ((len > RECV_MAX_PACKET_LEN) \|\|
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	220 (len < MIN_PACKET_LEN + macsize) \|\|
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	221 ((len - macsize) % blocksize != 0)) {
228 5e4110bb753a - Fixed twofish algorithm naming so it actually works. Matt Johnston <matt@ucc.asn.au> parents: 194 diff changeset	222 dropbear_exit("bad packet size %d", len);
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	223 }
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 buf_resize(ses.readbuf, len);
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	226 buf_setlen(ses.readbuf, len);
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	227
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	228 }
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	229
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	230 /* handle the received packet */
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	231 void decrypt_packet() {
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	232
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	233 unsigned char blocksize;
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	234 unsigned char macsize;
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	235 unsigned int padlen;
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	236 unsigned int len;
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	237
165 0cfba3034be5 Fixed DEBUG_TRACE macro so that we don't get semicolons left about the place Matt Johnston <matt@ucc.asn.au> parents: 70 diff changeset	238 TRACE(("enter decrypt_packet"))
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	239 blocksize = ses.keys->recv_algo_crypt->blocksize;
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	240 macsize = ses.keys->recv_algo_mac->hashsize;
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	241
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	242 ses.kexstate.datarecv += ses.readbuf->len;
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	243
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	244 /* 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	245 buf_setpos(ses.readbuf, blocksize);
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	246
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	247 buf_resize(ses.decryptreadbuf, ses.readbuf->len - macsize);
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	248 buf_setlen(ses.decryptreadbuf, ses.decryptreadbuf->size);
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	249 buf_setpos(ses.decryptreadbuf, blocksize);
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	250
502 43bbe17d6ba0 - Add Counter Mode support Matt Johnston <matt@ucc.asn.au> parents: 501 diff changeset	251 /* decrypt it */
43bbe17d6ba0 - Add Counter Mode support Matt Johnston <matt@ucc.asn.au> parents: 501 diff changeset	252 while (ses.readbuf->pos < ses.readbuf->len - macsize) {
43bbe17d6ba0 - Add Counter Mode support Matt Johnston <matt@ucc.asn.au> parents: 501 diff changeset	253 if (ses.keys->recv_crypt_mode->decrypt(
43bbe17d6ba0 - Add Counter Mode support Matt Johnston <matt@ucc.asn.au> parents: 501 diff changeset	254 buf_getptr(ses.readbuf, blocksize),
43bbe17d6ba0 - Add Counter Mode support Matt Johnston <matt@ucc.asn.au> parents: 501 diff changeset	255 buf_getwriteptr(ses.decryptreadbuf, blocksize),
43bbe17d6ba0 - Add Counter Mode support Matt Johnston <matt@ucc.asn.au> parents: 501 diff changeset	256 blocksize,
43bbe17d6ba0 - Add Counter Mode support Matt Johnston <matt@ucc.asn.au> parents: 501 diff changeset	257 &ses.keys->recv_cipher_state) != CRYPT_OK) {
43bbe17d6ba0 - Add Counter Mode support Matt Johnston <matt@ucc.asn.au> parents: 501 diff changeset	258 dropbear_exit("error decrypting");
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	259 }
502 43bbe17d6ba0 - Add Counter Mode support Matt Johnston <matt@ucc.asn.au> parents: 501 diff changeset	260 buf_incrpos(ses.readbuf, blocksize);
43bbe17d6ba0 - Add Counter Mode support Matt Johnston <matt@ucc.asn.au> parents: 501 diff changeset	261 buf_incrwritepos(ses.decryptreadbuf, blocksize);
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	262 }
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	263
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	264 /* check the hmac */
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	265 buf_setpos(ses.readbuf, ses.readbuf->len - macsize);
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	266 if (checkmac(ses.readbuf, ses.decryptreadbuf) != DROPBEAR_SUCCESS) {
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	267 dropbear_exit("Integrity error");
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	268 }
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	269
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	270 /* readbuf no longer required */
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	271 buf_free(ses.readbuf);
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	272 ses.readbuf = NULL;
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 /* get padding length */
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	275 buf_setpos(ses.decryptreadbuf, PACKET_PADDING_OFF);
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	276 padlen = buf_getbyte(ses.decryptreadbuf);
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 /* payload length */
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	279 /* - 4 - 1 is for LEN and PADLEN values */
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	280 len = ses.decryptreadbuf->len - padlen - 4 - 1;
448 9c61e7af0156 Rearrange the channel buffer sizes into three neat use-editable values in Matt Johnston <matt@ucc.asn.au> parents: 426 diff changeset	281 if ((len > RECV_MAX_PAYLOAD_LEN) \|\| (len < 1)) {
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	282 dropbear_exit("bad packet size");
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	283 }
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	284
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	285 buf_setpos(ses.decryptreadbuf, PACKET_PAYLOAD_OFF);
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 #ifndef DISABLE_ZLIB
501 d58c478bd399 Add support for [email protected] delayed compression. Matt Johnston <matt@ucc.asn.au> parents: 479 diff changeset	288 if (is_compress_recv()) {
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	289 /* decompress */
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	290 ses.payload = buf_decompress(ses.decryptreadbuf, len);
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	291 } else
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	292 #endif
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	293 {
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	294 /* copy payload */
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	295 ses.payload = buf_new(len);
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	296 memcpy(ses.payload->data, buf_getptr(ses.decryptreadbuf, len), len);
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	297 buf_incrlen(ses.payload, len);
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	298 }
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	299
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	300 buf_free(ses.decryptreadbuf);
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	301 ses.decryptreadbuf = NULL;
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	302 buf_setpos(ses.payload, 0);
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	303
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	304 ses.recvseq++;
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	305
165 0cfba3034be5 Fixed DEBUG_TRACE macro so that we don't get semicolons left about the place Matt Johnston <matt@ucc.asn.au> parents: 70 diff changeset	306 TRACE(("leave decrypt_packet"))
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	307 }
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	308
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	309 /* Checks the mac in hashbuf, for the data in readbuf.
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	310 * Returns DROPBEAR_SUCCESS or DROPBEAR_FAILURE */
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	311 static int checkmac(buffer* macbuf, buffer* sourcebuf) {
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	312
228 5e4110bb753a - Fixed twofish algorithm naming so it actually works. Matt Johnston <matt@ucc.asn.au> parents: 194 diff changeset	313 unsigned int macsize;
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	314 hmac_state hmac;
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	315 unsigned char tempbuf[MAX_MAC_LEN];
228 5e4110bb753a - Fixed twofish algorithm naming so it actually works. Matt Johnston <matt@ucc.asn.au> parents: 194 diff changeset	316 unsigned long bufsize;
5e4110bb753a - Fixed twofish algorithm naming so it actually works. Matt Johnston <matt@ucc.asn.au> parents: 194 diff changeset	317 unsigned int len;
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	318
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	319 macsize = ses.keys->recv_algo_mac->hashsize;
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	320 if (macsize == 0) {
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	321 return DROPBEAR_SUCCESS;
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	322 }
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	323
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	324 /* calculate the mac */
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	325 if (hmac_init(&hmac,
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	326 find_hash(ses.keys->recv_algo_mac->hashdesc->name),
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	327 ses.keys->recvmackey,
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	328 ses.keys->recv_algo_mac->keysize)
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	329 != CRYPT_OK) {
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	330 dropbear_exit("HMAC error");
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	331 }
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	332
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	333 /* sequence number */
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	334 STORE32H(ses.recvseq, tempbuf);
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	335 if (hmac_process(&hmac, tempbuf, 4) != CRYPT_OK) {
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	336 dropbear_exit("HMAC error");
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	337 }
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	338
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	339 buf_setpos(sourcebuf, 0);
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	340 len = sourcebuf->len;
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	341 if (hmac_process(&hmac, buf_getptr(sourcebuf, len), len) != CRYPT_OK) {
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	342 dropbear_exit("HMAC error");
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	343 }
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	344
228 5e4110bb753a - Fixed twofish algorithm naming so it actually works. Matt Johnston <matt@ucc.asn.au> parents: 194 diff changeset	345 bufsize = sizeof(tempbuf);
5e4110bb753a - Fixed twofish algorithm naming so it actually works. Matt Johnston <matt@ucc.asn.au> parents: 194 diff changeset	346 if (hmac_done(&hmac, tempbuf, &bufsize) != CRYPT_OK) {
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	347 dropbear_exit("HMAC error");
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	348 }
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	349
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	350 /* compare the hash */
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	351 if (memcmp(tempbuf, buf_getptr(macbuf, macsize), macsize) != 0) {
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	352 return DROPBEAR_FAILURE;
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	353 } else {
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	354 return DROPBEAR_SUCCESS;
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	355 }
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	356 }
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	357
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	358 #ifndef DISABLE_ZLIB
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	359 /* 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	360 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	361
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	362 int result;
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	363 buffer * ret;
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	364 z_streamp zstream;
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 zstream = ses.keys->recv_zstream;
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	367 ret = buf_new(len);
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	368
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	369 zstream->avail_in = len;
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	370 zstream->next_in = buf_getptr(buf, 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 /* 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	373 while (1) {
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	374
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	375 zstream->avail_out = ret->size - ret->pos;
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	376 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	377
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	378 result = inflate(zstream, Z_SYNC_FLUSH);
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	379
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	380 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	381 buf_setpos(ret, ret->len);
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	382
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	383 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	384 dropbear_exit("zlib error");
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	385 }
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	386
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	387 if (zstream->avail_in == 0 &&
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	388 (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	389 /* 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	390 * and there's no remaining input */
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	391 return ret;
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
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	394 if (zstream->avail_out == 0) {
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	395 buf_resize(ret, ret->size + ZLIB_DECOMPRESS_INCR);
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	396 }
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	397 }
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	398 }
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	399 #endif
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	400
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	401
452 4cab61369879 Prevent invalid packets being sent during key-exchange, instead queue Matt Johnston <matt@ucc.asn.au> parents: 448 diff changeset	402 /* 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	403 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	404 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	405 return 0;
4cab61369879 Prevent invalid packets being sent during key-exchange, instead queue Matt Johnston <matt@ucc.asn.au> parents: 448 diff changeset	406 }
4cab61369879 Prevent invalid packets being sent during key-exchange, instead queue Matt Johnston <matt@ucc.asn.au> parents: 448 diff changeset	407 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	408 return 0;
4cab61369879 Prevent invalid packets being sent during key-exchange, instead queue Matt Johnston <matt@ucc.asn.au> parents: 448 diff changeset	409 }
4cab61369879 Prevent invalid packets being sent during key-exchange, instead queue Matt Johnston <matt@ucc.asn.au> parents: 448 diff changeset	410 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	411 /* 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	412 return 0;
4cab61369879 Prevent invalid packets being sent during key-exchange, instead queue Matt Johnston <matt@ucc.asn.au> parents: 448 diff changeset	413 }
4cab61369879 Prevent invalid packets being sent during key-exchange, instead queue Matt Johnston <matt@ucc.asn.au> parents: 448 diff changeset	414 return 1;
4cab61369879 Prevent invalid packets being sent during key-exchange, instead queue Matt Johnston <matt@ucc.asn.au> parents: 448 diff changeset	415 }
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	416
452 4cab61369879 Prevent invalid packets being sent during key-exchange, instead queue Matt Johnston <matt@ucc.asn.au> parents: 448 diff changeset	417 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	418 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	419 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	420 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	421
4cab61369879 Prevent invalid packets being sent during key-exchange, instead queue Matt Johnston <matt@ucc.asn.au> parents: 448 diff changeset	422 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	423 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	424 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	425
4cab61369879 Prevent invalid packets being sent during key-exchange, instead queue Matt Johnston <matt@ucc.asn.au> parents: 448 diff changeset	426 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	427 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	428 } else {
4cab61369879 Prevent invalid packets being sent during key-exchange, instead queue Matt Johnston <matt@ucc.asn.au> parents: 448 diff changeset	429 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	430 }
456 f6c999ba31da Fix delayed packet queue handling Matt Johnston <matt@ucc.asn.au> parents: 454 diff changeset	431 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	432 TRACE(("leave enqueue_reply_packet"))
4cab61369879 Prevent invalid packets being sent during key-exchange, instead queue Matt Johnston <matt@ucc.asn.au> parents: 448 diff changeset	433 }
4cab61369879 Prevent invalid packets being sent during key-exchange, instead queue Matt Johnston <matt@ucc.asn.au> parents: 448 diff changeset	434
4cab61369879 Prevent invalid packets being sent during key-exchange, instead queue Matt Johnston <matt@ucc.asn.au> parents: 448 diff changeset	435 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	436 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	437 if (!ses.dataallowed)
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 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	440 return;
4cab61369879 Prevent invalid packets being sent during key-exchange, instead queue Matt Johnston <matt@ucc.asn.au> parents: 448 diff changeset	441 }
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 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	444 CHECKCLEARTOWRITE();
4cab61369879 Prevent invalid packets being sent during key-exchange, instead queue Matt Johnston <matt@ucc.asn.au> parents: 448 diff changeset	445 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	446 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	447
4cab61369879 Prevent invalid packets being sent during key-exchange, instead queue Matt Johnston <matt@ucc.asn.au> parents: 448 diff changeset	448 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	449 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	450 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	451 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	452 encrypt_packet();
4cab61369879 Prevent invalid packets being sent during key-exchange, instead queue Matt Johnston <matt@ucc.asn.au> parents: 448 diff changeset	453 }
4cab61369879 Prevent invalid packets being sent during key-exchange, instead queue Matt Johnston <matt@ucc.asn.au> parents: 448 diff changeset	454 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	455 }
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	456
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	457 /* 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	458 * to put on the wire */
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	459 void encrypt_packet() {
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	460
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	461 unsigned char padlen;
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	462 unsigned char blocksize, macsize;
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	463 buffer * writebuf; /* the packet which will go on the wire */
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	464 buffer * clearwritebuf; /* unencrypted, possibly compressed */
452 4cab61369879 Prevent invalid packets being sent during key-exchange, instead queue Matt Johnston <matt@ucc.asn.au> parents: 448 diff changeset	465 unsigned char type;
501 d58c478bd399 Add support for [email protected] delayed compression. Matt Johnston <matt@ucc.asn.au> parents: 479 diff changeset	466 unsigned int clear_len;
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	467
452 4cab61369879 Prevent invalid packets being sent during key-exchange, instead queue Matt Johnston <matt@ucc.asn.au> parents: 448 diff changeset	468 type = ses.writepayload->data[0];
165 0cfba3034be5 Fixed DEBUG_TRACE macro so that we don't get semicolons left about the place Matt Johnston <matt@ucc.asn.au> parents: 70 diff changeset	469 TRACE(("enter encrypt_packet()"))
452 4cab61369879 Prevent invalid packets being sent during key-exchange, instead queue Matt Johnston <matt@ucc.asn.au> parents: 448 diff changeset	470 TRACE(("encrypt_packet type is %d", type))
4cab61369879 Prevent invalid packets being sent during key-exchange, instead queue Matt Johnston <matt@ucc.asn.au> parents: 448 diff changeset	471
4cab61369879 Prevent invalid packets being sent during key-exchange, instead queue Matt Johnston <matt@ucc.asn.au> parents: 448 diff changeset	472 if (!ses.dataallowed && !packet_is_okay_kex(type)) {
4cab61369879 Prevent invalid packets being sent during key-exchange, instead queue Matt Johnston <matt@ucc.asn.au> parents: 448 diff changeset	473 /* During key exchange only particular packets are allowed.
4cab61369879 Prevent invalid packets being sent during key-exchange, instead queue Matt Johnston <matt@ucc.asn.au> parents: 448 diff changeset	474 Since this type isn't OK we just enqueue it to send
4cab61369879 Prevent invalid packets being sent during key-exchange, instead queue Matt Johnston <matt@ucc.asn.au> parents: 448 diff changeset	475 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	476 enqueue_reply_packet();
4cab61369879 Prevent invalid packets being sent during key-exchange, instead queue Matt Johnston <matt@ucc.asn.au> parents: 448 diff changeset	477 return;
4cab61369879 Prevent invalid packets being sent during key-exchange, instead queue Matt Johnston <matt@ucc.asn.au> parents: 448 diff changeset	478 }
4cab61369879 Prevent invalid packets being sent during key-exchange, instead queue Matt Johnston <matt@ucc.asn.au> parents: 448 diff changeset	479
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	480 blocksize = ses.keys->trans_algo_crypt->blocksize;
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	481 macsize = ses.keys->trans_algo_mac->hashsize;
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	482
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	483 /* Encrypted packet len is payload+5, then worst case is if we are 3 away
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	484 * from a blocksize multiple. In which case we need to pad to the
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	485 * multiple, then add another blocksize (or MIN_PACKET_LEN) */
501 d58c478bd399 Add support for [email protected] delayed compression. Matt Johnston <matt@ucc.asn.au> parents: 479 diff changeset	486 clear_len = (ses.writepayload->len+4+1) + MIN_PACKET_LEN + 3;
d58c478bd399 Add support for [email protected] delayed compression. Matt Johnston <matt@ucc.asn.au> parents: 479 diff changeset	487
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	488 #ifndef DISABLE_ZLIB
501 d58c478bd399 Add support for [email protected] delayed compression. Matt Johnston <matt@ucc.asn.au> parents: 479 diff changeset	489 clear_len += ZLIB_COMPRESS_INCR; /* bit of a kludge, but we can't know len*/
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	490 #endif
501 d58c478bd399 Add support for [email protected] delayed compression. Matt Johnston <matt@ucc.asn.au> parents: 479 diff changeset	491 clearwritebuf = buf_new(clear_len);
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	492 buf_setlen(clearwritebuf, PACKET_PAYLOAD_OFF);
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	493 buf_setpos(clearwritebuf, PACKET_PAYLOAD_OFF);
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	494
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	495 buf_setpos(ses.writepayload, 0);
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	496
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	497 #ifndef DISABLE_ZLIB
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	498 /* compression */
501 d58c478bd399 Add support for [email protected] delayed compression. Matt Johnston <matt@ucc.asn.au> parents: 479 diff changeset	499 if (is_compress_trans()) {
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	500 buf_compress(clearwritebuf, ses.writepayload, ses.writepayload->len);
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	501 } else
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	502 #endif
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	503 {
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	504 memcpy(buf_getwriteptr(clearwritebuf, ses.writepayload->len),
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	505 buf_getptr(ses.writepayload, ses.writepayload->len),
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	506 ses.writepayload->len);
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	507 buf_incrwritepos(clearwritebuf, ses.writepayload->len);
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	508 }
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	509
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	510 /* finished with payload */
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	511 buf_setpos(ses.writepayload, 0);
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	512 buf_setlen(ses.writepayload, 0);
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	513
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	514 /* 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	515 * with a minimum of 4 bytes of padding */
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	516 padlen = blocksize - (clearwritebuf->len) % blocksize;
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	517 if (padlen < 4) {
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	518 padlen += blocksize;
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	519 }
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	520 /* check for min packet length */
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	521 if (clearwritebuf->len + padlen < MIN_PACKET_LEN) {
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	522 padlen += blocksize;
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	523 }
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 buf_setpos(clearwritebuf, 0);
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	526 /* packet length excluding the packetlength uint32 */
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	527 buf_putint(clearwritebuf, clearwritebuf->len + padlen - 4);
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	528
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	529 /* padding len */
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	530 buf_putbyte(clearwritebuf, padlen);
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	531 /* actual padding */
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	532 buf_setpos(clearwritebuf, clearwritebuf->len);
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	533 buf_incrlen(clearwritebuf, padlen);
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	534 genrandom(buf_getptr(clearwritebuf, padlen), padlen);
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	535
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	536 /* do the actual encryption */
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	537 buf_setpos(clearwritebuf, 0);
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	538 /* create a new writebuffer, this is freed when it has been put on the
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	539 * wire by writepacket() */
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	540 writebuf = buf_new(clearwritebuf->len + macsize);
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	541
502 43bbe17d6ba0 - Add Counter Mode support Matt Johnston <matt@ucc.asn.au> parents: 501 diff changeset	542 /* encrypt it */
43bbe17d6ba0 - Add Counter Mode support Matt Johnston <matt@ucc.asn.au> parents: 501 diff changeset	543 while (clearwritebuf->pos < clearwritebuf->len) {
43bbe17d6ba0 - Add Counter Mode support Matt Johnston <matt@ucc.asn.au> parents: 501 diff changeset	544 if (ses.keys->trans_crypt_mode->encrypt(
43bbe17d6ba0 - Add Counter Mode support Matt Johnston <matt@ucc.asn.au> parents: 501 diff changeset	545 buf_getptr(clearwritebuf, blocksize),
43bbe17d6ba0 - Add Counter Mode support Matt Johnston <matt@ucc.asn.au> parents: 501 diff changeset	546 buf_getwriteptr(writebuf, blocksize),
43bbe17d6ba0 - Add Counter Mode support Matt Johnston <matt@ucc.asn.au> parents: 501 diff changeset	547 blocksize,
43bbe17d6ba0 - Add Counter Mode support Matt Johnston <matt@ucc.asn.au> parents: 501 diff changeset	548 &ses.keys->trans_cipher_state) != CRYPT_OK) {
43bbe17d6ba0 - Add Counter Mode support Matt Johnston <matt@ucc.asn.au> parents: 501 diff changeset	549 dropbear_exit("error encrypting");
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	550 }
502 43bbe17d6ba0 - Add Counter Mode support Matt Johnston <matt@ucc.asn.au> parents: 501 diff changeset	551 buf_incrpos(clearwritebuf, blocksize);
43bbe17d6ba0 - Add Counter Mode support Matt Johnston <matt@ucc.asn.au> parents: 501 diff changeset	552 buf_incrwritepos(writebuf, blocksize);
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	553 }
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	554
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	555 /* now add a hmac and we're done */
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	556 writemac(writebuf, clearwritebuf);
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	557
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	558 /* clearwritebuf is finished with */
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	559 buf_free(clearwritebuf);
70 b0316ce64e4b Merging in the changes from 0.41-0.43 main Dropbear tree Matt Johnston <matt@ucc.asn.au> parents: 33 diff changeset	560 clearwritebuf = NULL;
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	561
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	562 /* enqueue the packet for sending */
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	563 buf_setpos(writebuf, 0);
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	564 enqueue(&ses.writequeue, (void*)writebuf);
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	565
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	566 /* Update counts */
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	567 ses.kexstate.datatrans += writebuf->len;
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	568 ses.transseq++;
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	569
165 0cfba3034be5 Fixed DEBUG_TRACE macro so that we don't get semicolons left about the place Matt Johnston <matt@ucc.asn.au> parents: 70 diff changeset	570 TRACE(("leave encrypt_packet()"))
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	571 }
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	572
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	573
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	574 /* Create the packet mac, and append H(seqno\|clearbuf) to the output */
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	575 static void writemac(buffer * outputbuffer, buffer * clearwritebuf) {
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	576
228 5e4110bb753a - Fixed twofish algorithm naming so it actually works. Matt Johnston <matt@ucc.asn.au> parents: 194 diff changeset	577 unsigned int macsize;
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	578 unsigned char seqbuf[4];
228 5e4110bb753a - Fixed twofish algorithm naming so it actually works. Matt Johnston <matt@ucc.asn.au> parents: 194 diff changeset	579 unsigned char tempbuf[MAX_MAC_LEN];
5e4110bb753a - Fixed twofish algorithm naming so it actually works. Matt Johnston <matt@ucc.asn.au> parents: 194 diff changeset	580 unsigned long bufsize;
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	581 hmac_state hmac;
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	582
165 0cfba3034be5 Fixed DEBUG_TRACE macro so that we don't get semicolons left about the place Matt Johnston <matt@ucc.asn.au> parents: 70 diff changeset	583 TRACE(("enter writemac"))
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	584
232 cbf1165d9386 trans, not recv for macsize Matt Johnston <matt@ucc.asn.au> parents: 228 diff changeset	585 macsize = ses.keys->trans_algo_mac->hashsize;
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	586 if (macsize > 0) {
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	587 /* calculate the mac */
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	588 if (hmac_init(&hmac,
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	589 find_hash(ses.keys->trans_algo_mac->hashdesc->name),
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	590 ses.keys->transmackey,
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	591 ses.keys->trans_algo_mac->keysize) != CRYPT_OK) {
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	592 dropbear_exit("HMAC error");
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	593 }
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	594
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	595 /* sequence number */
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	596 STORE32H(ses.transseq, seqbuf);
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	597 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	598 dropbear_exit("HMAC error");
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	599 }
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	600
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	601 /* the actual contents */
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	602 buf_setpos(clearwritebuf, 0);
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	603 if (hmac_process(&hmac,
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	604 buf_getptr(clearwritebuf,
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	605 clearwritebuf->len),
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	606 clearwritebuf->len) != CRYPT_OK) {
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	607 dropbear_exit("HMAC error");
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	608 }
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	609
228 5e4110bb753a - Fixed twofish algorithm naming so it actually works. Matt Johnston <matt@ucc.asn.au> parents: 194 diff changeset	610 bufsize = sizeof(tempbuf);
5e4110bb753a - Fixed twofish algorithm naming so it actually works. Matt Johnston <matt@ucc.asn.au> parents: 194 diff changeset	611 if (hmac_done(&hmac, tempbuf, &bufsize)
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	612 != CRYPT_OK) {
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	613 dropbear_exit("HMAC error");
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	614 }
228 5e4110bb753a - Fixed twofish algorithm naming so it actually works. Matt Johnston <matt@ucc.asn.au> parents: 194 diff changeset	615 buf_putbytes(outputbuffer, tempbuf, macsize);
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	616 }
165 0cfba3034be5 Fixed DEBUG_TRACE macro so that we don't get semicolons left about the place Matt Johnston <matt@ucc.asn.au> parents: 70 diff changeset	617 TRACE(("leave writemac"))
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	618 }
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	619
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	620 #ifndef DISABLE_ZLIB
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	621 /* compresses len bytes from src, outputting to dest (starting from the
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	622 * respective current positions. */
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	623 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	624
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	625 unsigned int endpos = src->pos + len;
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	626 int result;
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	627
165 0cfba3034be5 Fixed DEBUG_TRACE macro so that we don't get semicolons left about the place Matt Johnston <matt@ucc.asn.au> parents: 70 diff changeset	628 TRACE(("enter buf_compress"))
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	629
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	630 while (1) {
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	631
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	632 ses.keys->trans_zstream->avail_in = endpos - src->pos;
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	633 ses.keys->trans_zstream->next_in =
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	634 buf_getptr(src, ses.keys->trans_zstream->avail_in);
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	635
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	636 ses.keys->trans_zstream->avail_out = dest->size - dest->pos;
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	637 ses.keys->trans_zstream->next_out =
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	638 buf_getwriteptr(dest, ses.keys->trans_zstream->avail_out);
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 result = deflate(ses.keys->trans_zstream, Z_SYNC_FLUSH);
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	641
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	642 buf_setpos(src, endpos - ses.keys->trans_zstream->avail_in);
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	643 buf_setlen(dest, dest->size - ses.keys->trans_zstream->avail_out);
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	644 buf_setpos(dest, dest->len);
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	645
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	646 if (result != Z_OK) {
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	647 dropbear_exit("zlib error");
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	648 }
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	649
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	650 if (ses.keys->trans_zstream->avail_in == 0) {
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	651 break;
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	652 }
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	653
241 c5d3ef11155f * use own assertions which should get logged properly Matt Johnston <matt@ucc.asn.au> parents: 232 diff changeset	654 dropbear_assert(ses.keys->trans_zstream->avail_out == 0);
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	655
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	656 /* the buffer has been filled, we must extend. This only happens in
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	657 * unusual circumstances where the data grows in size after deflate(),
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	658 * but it is possible */
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	659 buf_resize(dest, dest->size + ZLIB_COMPRESS_INCR);
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	660
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	661 }
165 0cfba3034be5 Fixed DEBUG_TRACE macro so that we don't get semicolons left about the place Matt Johnston <matt@ucc.asn.au> parents: 70 diff changeset	662 TRACE(("leave buf_compress"))
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	663 }
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	664 #endif

Mercurial > dropbear

annotate packet.c @ 529:da6340a60039