dropbear: packet.c annotate

annotate packet.c @ 654:818108bf7749

- Fix use-after-free if multiple command requests were sent. Move the original_command into chansess struct since that makes more sense

author	Matt Johnston <matt@ucc.asn.au>
date	Sun, 04 Dec 2011 05:31:25 +0800
parents	895fbe068f2c
children	f4232b65b316

rev	line source
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	1 /*
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	2 * Dropbear - a SSH2 server
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	3 *
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	4 * Copyright (c) 2002,2003 Matt Johnston
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	5 * All rights reserved.
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	6 *
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	7 * Permission is hereby granted, free of charge, to any person obtaining a copy
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	8 * of this software and associated documentation files (the "Software"), to deal
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	9 * in the Software without restriction, including without limitation the rights
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	10 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	11 * copies of the Software, and to permit persons to whom the Software is
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	12 * furnished to do so, subject to the following conditions:
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	13 *
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	14 * The above copyright notice and this permission notice shall be included in
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	15 * all copies or substantial portions of the Software.
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	16 *
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	17 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	18 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	19 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	20 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	21 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	22 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	23 * SOFTWARE. */
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	24
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	25 #include "includes.h"
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	26 #include "packet.h"
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	27 #include "session.h"
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	28 #include "dbutil.h"
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	29 #include "ssh.h"
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	30 #include "algo.h"
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	31 #include "buffer.h"
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	32 #include "kex.h"
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	33 #include "random.h"
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	34 #include "service.h"
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	35 #include "auth.h"
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	36 #include "channel.h"
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	37
534 0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf Matt Johnston <matt@ucc.asn.au> parents: 533 diff changeset	38 static int read_packet_init();
0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf Matt Johnston <matt@ucc.asn.au> parents: 533 diff changeset	39 static void make_mac(unsigned int seqno, const struct key_context_directional * key_state,
0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf Matt Johnston <matt@ucc.asn.au> parents: 533 diff changeset	40 buffer * clear_buf, unsigned int clear_len,
0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf Matt Johnston <matt@ucc.asn.au> parents: 533 diff changeset	41 unsigned char *output_mac);
0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf Matt Johnston <matt@ucc.asn.au> parents: 533 diff changeset	42 static int checkmac();
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	43
605 53c21d4ec98a - Don't allow setting memLevel since that doesn't work properly Matt Johnston <matt@ucc.asn.au> parents: 594 diff changeset	44 #define ZLIB_COMPRESS_INCR 100
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	45 #define ZLIB_DECOMPRESS_INCR 100
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	46 #ifndef DISABLE_ZLIB
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	47 static buffer* buf_decompress(buffer* buf, unsigned int len);
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	48 static void buf_compress(buffer * dest, buffer * src, unsigned int len);
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	49 #endif
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	50
531 164b7c2cd5df disapproval of revision 'a101cbd046507cf723e6362a49196dbd4b924042' Matt Johnston <matt@ucc.asn.au> parents: 529 diff changeset	51 /* non-blocking function writing out a current encrypted packet */
164b7c2cd5df disapproval of revision 'a101cbd046507cf723e6362a49196dbd4b924042' Matt Johnston <matt@ucc.asn.au> parents: 529 diff changeset	52 void write_packet() {
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	53
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	54 int len, written;
70 b0316ce64e4b Merging in the changes from 0.41-0.43 main Dropbear tree Matt Johnston <matt@ucc.asn.au> parents: 33 diff changeset	55 buffer * writebuf = NULL;
592 afb089e70892 Don't reset last_packet_time when we're transmitting SSH_MSG_IGNORE packets Matt Johnston <matt@ucc.asn.au> parents: 568 diff changeset	56 time_t now;
afb089e70892 Don't reset last_packet_time when we're transmitting SSH_MSG_IGNORE packets Matt Johnston <matt@ucc.asn.au> parents: 568 diff changeset	57 unsigned packet_type;
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	58
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	59 TRACE(("enter write_packet"))
531 164b7c2cd5df disapproval of revision 'a101cbd046507cf723e6362a49196dbd4b924042' Matt Johnston <matt@ucc.asn.au> parents: 529 diff changeset	60 dropbear_assert(!isempty(&ses.writequeue));
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	61
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	62 /* 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	63 writebuf = (buffer*)examine(&ses.writequeue);
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	64
592 afb089e70892 Don't reset last_packet_time when we're transmitting SSH_MSG_IGNORE packets Matt Johnston <matt@ucc.asn.au> parents: 568 diff changeset	65 /* The last byte of the buffer is not to be transmitted, but is
afb089e70892 Don't reset last_packet_time when we're transmitting SSH_MSG_IGNORE packets Matt Johnston <matt@ucc.asn.au> parents: 568 diff changeset	66 * a cleartext packet_type indicator */
afb089e70892 Don't reset last_packet_time when we're transmitting SSH_MSG_IGNORE packets Matt Johnston <matt@ucc.asn.au> parents: 568 diff changeset	67 packet_type = writebuf->data[writebuf->len-1];
afb089e70892 Don't reset last_packet_time when we're transmitting SSH_MSG_IGNORE packets Matt Johnston <matt@ucc.asn.au> parents: 568 diff changeset	68 len = writebuf->len - 1 - writebuf->pos;
241 c5d3ef11155f * use own assertions which should get logged properly Matt Johnston <matt@ucc.asn.au> parents: 232 diff changeset	69 dropbear_assert(len > 0);
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	70 /* 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	71 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	72
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	73 if (written < 0) {
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	74 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	75 TRACE(("leave writepacket: EINTR"))
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	76 return;
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	77 } else {
594 a98a2138364a Improve capitalisation for all logged strings Matt Johnston <matt@ucc.asn.au> parents: 592 diff changeset	78 dropbear_exit("Error writing");
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 }
454 7e43f5e473b9 - Add -K keepalive flag for dropbear and dbclient Matt Johnston <matt@ucc.asn.au> parents: 452 diff changeset	81
592 afb089e70892 Don't reset last_packet_time when we're transmitting SSH_MSG_IGNORE packets Matt Johnston <matt@ucc.asn.au> parents: 568 diff changeset	82 now = time(NULL);
afb089e70892 Don't reset last_packet_time when we're transmitting SSH_MSG_IGNORE packets Matt Johnston <matt@ucc.asn.au> parents: 568 diff changeset	83 ses.last_trx_packet_time = now;
afb089e70892 Don't reset last_packet_time when we're transmitting SSH_MSG_IGNORE packets Matt Johnston <matt@ucc.asn.au> parents: 568 diff changeset	84
afb089e70892 Don't reset last_packet_time when we're transmitting SSH_MSG_IGNORE packets Matt Johnston <matt@ucc.asn.au> parents: 568 diff changeset	85 if (packet_type != SSH_MSG_IGNORE) {
afb089e70892 Don't reset last_packet_time when we're transmitting SSH_MSG_IGNORE packets Matt Johnston <matt@ucc.asn.au> parents: 568 diff changeset	86 ses.last_packet_time = now;
afb089e70892 Don't reset last_packet_time when we're transmitting SSH_MSG_IGNORE packets Matt Johnston <matt@ucc.asn.au> parents: 568 diff changeset	87 }
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	88
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	89 if (written == 0) {
33 f789045062e6 Progressing client support Matt Johnston <matt@ucc.asn.au> parents: 27 diff changeset	90 ses.remoteclosed();
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	91 }
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	92
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	93 if (written == len) {
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	94 /* 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	95 dequeue(&ses.writequeue);
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	96 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	97 writebuf = NULL;
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	98 } else {
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	99 /* 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	100 buf_incrpos(writebuf, written);
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	101 }
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	102
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	103 TRACE(("leave write_packet"))
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	104 }
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	105
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	106 /* 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	107 * 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	108 * full portion if possible */
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	109 void read_packet() {
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	110
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	111 int len;
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	112 unsigned int maxlen;
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	113 unsigned char blocksize;
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	114
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	115 TRACE(("enter read_packet"))
534 0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf Matt Johnston <matt@ucc.asn.au> parents: 533 diff changeset	116 blocksize = ses.keys->recv.algo_crypt->blocksize;
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	117
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	118 if (ses.readbuf == NULL \|\| ses.readbuf->len < blocksize) {
534 0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf Matt Johnston <matt@ucc.asn.au> parents: 533 diff changeset	119 int ret;
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	120 /* In the first blocksize of a packet */
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	121
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	122 /* 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	123 * find the length of the whole packet */
534 0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf Matt Johnston <matt@ucc.asn.au> parents: 533 diff changeset	124 ret = read_packet_init();
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	125
534 0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf Matt Johnston <matt@ucc.asn.au> parents: 533 diff changeset	126 if (ret == DROPBEAR_FAILURE) {
0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf Matt Johnston <matt@ucc.asn.au> parents: 533 diff changeset	127 /* didn't read enough to determine the length */
165 0cfba3034be5 Fixed DEBUG_TRACE macro so that we don't get semicolons left about the place Matt Johnston <matt@ucc.asn.au> parents: 70 diff changeset	128 TRACE(("leave read_packet: packetinit done"))
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	129 return;
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 }
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	132
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	133 /* 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	134 * mightn't be any available (EAGAIN) */
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	135 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	136 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	137
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	138 if (len == 0) {
33 f789045062e6 Progressing client support Matt Johnston <matt@ucc.asn.au> parents: 27 diff changeset	139 ses.remoteclosed();
27 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
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	142 if (len < 0) {
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	143 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	144 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	145 return;
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	146 } else {
594 a98a2138364a Improve capitalisation for all logged strings Matt Johnston <matt@ucc.asn.au> parents: 592 diff changeset	147 dropbear_exit("Error reading: %s", strerror(errno));
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	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
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	151 buf_incrpos(ses.readbuf, len);
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	152
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	153 if ((unsigned int)len == maxlen) {
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	154 /* The whole packet has been read */
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	155 decrypt_packet();
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	156 /* The main select() loop process_packet() to
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	157 * handle the packet contents... */
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	158 }
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	159 TRACE(("leave read_packet"))
27 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
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	162 /* 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	163 * length. Only called during the first BLOCKSIZE of a packet. */
534 0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf Matt Johnston <matt@ucc.asn.au> parents: 533 diff changeset	164 /* Returns DROPBEAR_SUCCESS if the length is determined,
0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf Matt Johnston <matt@ucc.asn.au> parents: 533 diff changeset	165 * DROPBEAR_FAILURE otherwise */
0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf Matt Johnston <matt@ucc.asn.au> parents: 533 diff changeset	166 static int read_packet_init() {
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	167
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	168 unsigned int maxlen;
568 005530560594 Rearrange getaddrstring() etc Matt Johnston <matt@ucc.asn.au> parents: 556 diff changeset	169 int slen;
005530560594 Rearrange getaddrstring() etc Matt Johnston <matt@ucc.asn.au> parents: 556 diff changeset	170 unsigned int len;
005530560594 Rearrange getaddrstring() etc Matt Johnston <matt@ucc.asn.au> parents: 556 diff changeset	171 unsigned int blocksize;
005530560594 Rearrange getaddrstring() etc Matt Johnston <matt@ucc.asn.au> parents: 556 diff changeset	172 unsigned int macsize;
27 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
534 0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf Matt Johnston <matt@ucc.asn.au> parents: 533 diff changeset	175 blocksize = ses.keys->recv.algo_crypt->blocksize;
0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf Matt Johnston <matt@ucc.asn.au> parents: 533 diff changeset	176 macsize = ses.keys->recv.algo_mac->hashsize;
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	177
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	178 if (ses.readbuf == NULL) {
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	179 /* start of a new packet */
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	180 ses.readbuf = buf_new(INIT_READBUF);
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	181 }
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 maxlen = blocksize - ses.readbuf->pos;
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	184
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	185 /* read the rest of the packet if possible */
568 005530560594 Rearrange getaddrstring() etc Matt Johnston <matt@ucc.asn.au> parents: 556 diff changeset	186 slen = read(ses.sock_in, buf_getwriteptr(ses.readbuf, maxlen),
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	187 maxlen);
568 005530560594 Rearrange getaddrstring() etc Matt Johnston <matt@ucc.asn.au> parents: 556 diff changeset	188 if (slen == 0) {
33 f789045062e6 Progressing client support Matt Johnston <matt@ucc.asn.au> parents: 27 diff changeset	189 ses.remoteclosed();
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	190 }
568 005530560594 Rearrange getaddrstring() etc Matt Johnston <matt@ucc.asn.au> parents: 556 diff changeset	191 if (slen < 0) {
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	192 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	193 TRACE(("leave read_packet_init: EINTR"))
534 0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf Matt Johnston <matt@ucc.asn.au> parents: 533 diff changeset	194 return DROPBEAR_FAILURE;
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	195 }
594 a98a2138364a Improve capitalisation for all logged strings Matt Johnston <matt@ucc.asn.au> parents: 592 diff changeset	196 dropbear_exit("Error reading: %s", strerror(errno));
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	197 }
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	198
568 005530560594 Rearrange getaddrstring() etc Matt Johnston <matt@ucc.asn.au> parents: 556 diff changeset	199 buf_incrwritepos(ses.readbuf, slen);
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	200
568 005530560594 Rearrange getaddrstring() etc Matt Johnston <matt@ucc.asn.au> parents: 556 diff changeset	201 if ((unsigned int)slen != maxlen) {
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	202 /* don't have enough bytes to determine length, get next time */
534 0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf Matt Johnston <matt@ucc.asn.au> parents: 533 diff changeset	203 return DROPBEAR_FAILURE;
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	204 }
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	205
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	206 /* 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	207 * 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	208 buf_setpos(ses.readbuf, 0);
534 0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf Matt Johnston <matt@ucc.asn.au> parents: 533 diff changeset	209 if (ses.keys->recv.crypt_mode->decrypt(buf_getptr(ses.readbuf, blocksize),
0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf Matt Johnston <matt@ucc.asn.au> parents: 533 diff changeset	210 buf_getwriteptr(ses.readbuf, blocksize),
502 43bbe17d6ba0 - Add Counter Mode support Matt Johnston <matt@ucc.asn.au> parents: 501 diff changeset	211 blocksize,
534 0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf Matt Johnston <matt@ucc.asn.au> parents: 533 diff changeset	212 &ses.keys->recv.cipher_state) != CRYPT_OK) {
594 a98a2138364a Improve capitalisation for all logged strings Matt Johnston <matt@ucc.asn.au> parents: 592 diff changeset	213 dropbear_exit("Error decrypting");
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	214 }
534 0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf Matt Johnston <matt@ucc.asn.au> parents: 533 diff changeset	215 len = buf_getint(ses.readbuf) + 4 + macsize;
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	216
534 0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf Matt Johnston <matt@ucc.asn.au> parents: 533 diff changeset	217 TRACE(("packet size is %d, block %d mac %d", len, blocksize, macsize))
0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf Matt Johnston <matt@ucc.asn.au> parents: 533 diff changeset	218
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	219
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	220 /* 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	221 if ((len > RECV_MAX_PACKET_LEN) \|\|
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	222 (len < MIN_PACKET_LEN + macsize) \|\|
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	223 ((len - macsize) % blocksize != 0)) {
594 a98a2138364a Improve capitalisation for all logged strings Matt Johnston <matt@ucc.asn.au> parents: 592 diff changeset	224 dropbear_exit("Integrity error (bad packet size %d)", len);
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	225 }
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	226
534 0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf Matt Johnston <matt@ucc.asn.au> parents: 533 diff changeset	227 if (len > ses.readbuf->size) {
0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf Matt Johnston <matt@ucc.asn.au> parents: 533 diff changeset	228 buf_resize(ses.readbuf, len);
0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf Matt Johnston <matt@ucc.asn.au> parents: 533 diff changeset	229 }
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	230 buf_setlen(ses.readbuf, len);
534 0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf Matt Johnston <matt@ucc.asn.au> parents: 533 diff changeset	231 buf_setpos(ses.readbuf, blocksize);
0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf Matt Johnston <matt@ucc.asn.au> parents: 533 diff changeset	232 return DROPBEAR_SUCCESS;
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	233 }
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	234
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	235 /* handle the received packet */
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	236 void decrypt_packet() {
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	237
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	238 unsigned char blocksize;
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	239 unsigned char macsize;
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	240 unsigned int padlen;
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	241 unsigned int len;
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	242
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	243 TRACE(("enter decrypt_packet"))
534 0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf Matt Johnston <matt@ucc.asn.au> parents: 533 diff changeset	244 blocksize = ses.keys->recv.algo_crypt->blocksize;
0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf Matt Johnston <matt@ucc.asn.au> parents: 533 diff changeset	245 macsize = ses.keys->recv.algo_mac->hashsize;
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	246
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	247 ses.kexstate.datarecv += ses.readbuf->len;
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	248
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	249 /* 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	250 buf_setpos(ses.readbuf, blocksize);
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	251
534 0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf Matt Johnston <matt@ucc.asn.au> parents: 533 diff changeset	252 /* decrypt it in-place */
528 378a6389f88e - Don't be dumb and encrypt/decrypt in a while() loop - why did I do this?? Matt Johnston <matt@ucc.asn.au> parents: 513 diff changeset	253 len = ses.readbuf->len - macsize - ses.readbuf->pos;
534 0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf Matt Johnston <matt@ucc.asn.au> parents: 533 diff changeset	254 if (ses.keys->recv.crypt_mode->decrypt(
528 378a6389f88e - Don't be dumb and encrypt/decrypt in a while() loop - why did I do this?? Matt Johnston <matt@ucc.asn.au> parents: 513 diff changeset	255 buf_getptr(ses.readbuf, len),
534 0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf Matt Johnston <matt@ucc.asn.au> parents: 533 diff changeset	256 buf_getwriteptr(ses.readbuf, len),
528 378a6389f88e - Don't be dumb and encrypt/decrypt in a while() loop - why did I do this?? Matt Johnston <matt@ucc.asn.au> parents: 513 diff changeset	257 len,
534 0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf Matt Johnston <matt@ucc.asn.au> parents: 533 diff changeset	258 &ses.keys->recv.cipher_state) != CRYPT_OK) {
594 a98a2138364a Improve capitalisation for all logged strings Matt Johnston <matt@ucc.asn.au> parents: 592 diff changeset	259 dropbear_exit("Error decrypting");
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	260 }
528 378a6389f88e - Don't be dumb and encrypt/decrypt in a while() loop - why did I do this?? Matt Johnston <matt@ucc.asn.au> parents: 513 diff changeset	261 buf_incrpos(ses.readbuf, len);
534 0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf Matt Johnston <matt@ucc.asn.au> parents: 533 diff changeset	262
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	263 /* check the hmac */
534 0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf Matt Johnston <matt@ucc.asn.au> parents: 533 diff changeset	264 if (checkmac() != DROPBEAR_SUCCESS) {
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	265 dropbear_exit("Integrity error");
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	266 }
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	267
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	268 /* get padding length */
534 0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf Matt Johnston <matt@ucc.asn.au> parents: 533 diff changeset	269 buf_setpos(ses.readbuf, PACKET_PADDING_OFF);
0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf Matt Johnston <matt@ucc.asn.au> parents: 533 diff changeset	270 padlen = buf_getbyte(ses.readbuf);
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	271
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	272 /* payload length */
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	273 /* - 4 - 1 is for LEN and PADLEN values */
556 ccdc4c6183c0 - Payload length doesn't include macsize. Matt Johnston <matt@ucc.asn.au> parents: 535 diff changeset	274 len = ses.readbuf->len - padlen - 4 - 1 - macsize;
448 9c61e7af0156 Rearrange the channel buffer sizes into three neat use-editable values in Matt Johnston <matt@ucc.asn.au> parents: 426 diff changeset	275 if ((len > RECV_MAX_PAYLOAD_LEN) \|\| (len < 1)) {
594 a98a2138364a Improve capitalisation for all logged strings Matt Johnston <matt@ucc.asn.au> parents: 592 diff changeset	276 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	277 }
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	278
534 0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf Matt Johnston <matt@ucc.asn.au> parents: 533 diff changeset	279 buf_setpos(ses.readbuf, PACKET_PAYLOAD_OFF);
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	280
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	281 #ifndef DISABLE_ZLIB
501 d58c478bd399 Add support for [email protected] delayed compression. Matt Johnston <matt@ucc.asn.au> parents: 479 diff changeset	282 if (is_compress_recv()) {
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	283 /* decompress */
534 0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf Matt Johnston <matt@ucc.asn.au> parents: 533 diff changeset	284 ses.payload = buf_decompress(ses.readbuf, len);
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	285 } else
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	286 #endif
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	287 {
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	288 /* copy payload */
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	289 ses.payload = buf_new(len);
534 0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf Matt Johnston <matt@ucc.asn.au> parents: 533 diff changeset	290 memcpy(ses.payload->data, buf_getptr(ses.readbuf, len), len);
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	291 buf_incrlen(ses.payload, len);
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	292 }
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	293
534 0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf Matt Johnston <matt@ucc.asn.au> parents: 533 diff changeset	294 buf_free(ses.readbuf);
0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf Matt Johnston <matt@ucc.asn.au> parents: 533 diff changeset	295 ses.readbuf = NULL;
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	296 buf_setpos(ses.payload, 0);
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	297
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	298 ses.recvseq++;
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	299
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	300 TRACE(("leave decrypt_packet"))
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	301 }
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	302
534 0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf Matt Johnston <matt@ucc.asn.au> parents: 533 diff changeset	303 /* Checks the mac at the end of a decrypted readbuf.
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	304 * Returns DROPBEAR_SUCCESS or DROPBEAR_FAILURE */
534 0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf Matt Johnston <matt@ucc.asn.au> parents: 533 diff changeset	305 static int checkmac() {
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	306
534 0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf Matt Johnston <matt@ucc.asn.au> parents: 533 diff changeset	307 unsigned char mac_bytes[MAX_MAC_LEN];
0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf Matt Johnston <matt@ucc.asn.au> parents: 533 diff changeset	308 unsigned int mac_size, contents_len;
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	309
534 0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf Matt Johnston <matt@ucc.asn.au> parents: 533 diff changeset	310 mac_size = ses.keys->trans.algo_mac->hashsize;
0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf Matt Johnston <matt@ucc.asn.au> parents: 533 diff changeset	311 contents_len = ses.readbuf->len - mac_size;
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	312
534 0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf Matt Johnston <matt@ucc.asn.au> parents: 533 diff changeset	313 buf_setpos(ses.readbuf, 0);
0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf Matt Johnston <matt@ucc.asn.au> parents: 533 diff changeset	314 make_mac(ses.recvseq, &ses.keys->recv, ses.readbuf, contents_len, mac_bytes);
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	315
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	316 /* compare the hash */
534 0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf Matt Johnston <matt@ucc.asn.au> parents: 533 diff changeset	317 buf_setpos(ses.readbuf, contents_len);
0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf Matt Johnston <matt@ucc.asn.au> parents: 533 diff changeset	318 if (memcmp(mac_bytes, buf_getptr(ses.readbuf, mac_size), mac_size) != 0) {
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	319 return DROPBEAR_FAILURE;
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	320 } else {
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
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	325 #ifndef DISABLE_ZLIB
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	326 /* 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	327 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	328
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	329 int result;
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	330 buffer * ret;
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	331 z_streamp zstream;
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	332
534 0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf Matt Johnston <matt@ucc.asn.au> parents: 533 diff changeset	333 zstream = ses.keys->recv.zstream;
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	334 ret = buf_new(len);
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	335
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	336 zstream->avail_in = len;
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	337 zstream->next_in = buf_getptr(buf, len);
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 /* 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	340 while (1) {
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	341
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	342 zstream->avail_out = ret->size - ret->pos;
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	343 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	344
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	345 result = inflate(zstream, Z_SYNC_FLUSH);
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	346
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	347 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	348 buf_setpos(ret, ret->len);
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 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	351 dropbear_exit("zlib error");
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	352 }
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	353
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	354 if (zstream->avail_in == 0 &&
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	355 (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	356 /* 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	357 * and there's no remaining input */
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	358 return ret;
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	359 }
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	360
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	361 if (zstream->avail_out == 0) {
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	362 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	363 }
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	364 }
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 #endif
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	367
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	368
452 4cab61369879 Prevent invalid packets being sent during key-exchange, instead queue Matt Johnston <matt@ucc.asn.au> parents: 448 diff changeset	369 /* 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	370 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	371 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	372 return 0;
4cab61369879 Prevent invalid packets being sent during key-exchange, instead queue Matt Johnston <matt@ucc.asn.au> parents: 448 diff changeset	373 }
4cab61369879 Prevent invalid packets being sent during key-exchange, instead queue Matt Johnston <matt@ucc.asn.au> parents: 448 diff changeset	374 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	375 return 0;
4cab61369879 Prevent invalid packets being sent during key-exchange, instead queue Matt Johnston <matt@ucc.asn.au> parents: 448 diff changeset	376 }
4cab61369879 Prevent invalid packets being sent during key-exchange, instead queue Matt Johnston <matt@ucc.asn.au> parents: 448 diff changeset	377 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	378 /* 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	379 return 0;
4cab61369879 Prevent invalid packets being sent during key-exchange, instead queue Matt Johnston <matt@ucc.asn.au> parents: 448 diff changeset	380 }
4cab61369879 Prevent invalid packets being sent during key-exchange, instead queue Matt Johnston <matt@ucc.asn.au> parents: 448 diff changeset	381 return 1;
4cab61369879 Prevent invalid packets being sent during key-exchange, instead queue Matt Johnston <matt@ucc.asn.au> parents: 448 diff changeset	382 }
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	383
452 4cab61369879 Prevent invalid packets being sent during key-exchange, instead queue Matt Johnston <matt@ucc.asn.au> parents: 448 diff changeset	384 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	385 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	386 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	387 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	388
4cab61369879 Prevent invalid packets being sent during key-exchange, instead queue Matt Johnston <matt@ucc.asn.au> parents: 448 diff changeset	389 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	390 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	391 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	392
4cab61369879 Prevent invalid packets being sent during key-exchange, instead queue Matt Johnston <matt@ucc.asn.au> parents: 448 diff changeset	393 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	394 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	395 } else {
4cab61369879 Prevent invalid packets being sent during key-exchange, instead queue Matt Johnston <matt@ucc.asn.au> parents: 448 diff changeset	396 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	397 }
456 f6c999ba31da Fix delayed packet queue handling Matt Johnston <matt@ucc.asn.au> parents: 454 diff changeset	398 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	399 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	400 }
4cab61369879 Prevent invalid packets being sent during key-exchange, instead queue Matt Johnston <matt@ucc.asn.au> parents: 448 diff changeset	401
4cab61369879 Prevent invalid packets being sent during key-exchange, instead queue Matt Johnston <matt@ucc.asn.au> parents: 448 diff changeset	402 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	403 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	404 if (!ses.dataallowed)
4cab61369879 Prevent invalid packets being sent during key-exchange, instead queue Matt Johnston <matt@ucc.asn.au> parents: 448 diff changeset	405 {
4cab61369879 Prevent invalid packets being sent during key-exchange, instead queue Matt Johnston <matt@ucc.asn.au> parents: 448 diff changeset	406 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	407 return;
4cab61369879 Prevent invalid packets being sent during key-exchange, instead queue Matt Johnston <matt@ucc.asn.au> parents: 448 diff changeset	408 }
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 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	411 CHECKCLEARTOWRITE();
4cab61369879 Prevent invalid packets being sent during key-exchange, instead queue Matt Johnston <matt@ucc.asn.au> parents: 448 diff changeset	412 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	413 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	414
4cab61369879 Prevent invalid packets being sent during key-exchange, instead queue Matt Johnston <matt@ucc.asn.au> parents: 448 diff changeset	415 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	416 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	417 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	418 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	419 encrypt_packet();
4cab61369879 Prevent invalid packets being sent during key-exchange, instead queue Matt Johnston <matt@ucc.asn.au> parents: 448 diff changeset	420 }
4cab61369879 Prevent invalid packets being sent during key-exchange, instead queue Matt Johnston <matt@ucc.asn.au> parents: 448 diff changeset	421 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	422 }
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	423
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	424 /* 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	425 * to put on the wire */
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	426 void encrypt_packet() {
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	427
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	428 unsigned char padlen;
533 805ae74ec024 Encrypt in-place, avoid an extra malloc Matt Johnston <matt@ucc.asn.au> parents: 532 diff changeset	429 unsigned char blocksize, mac_size;
805ae74ec024 Encrypt in-place, avoid an extra malloc Matt Johnston <matt@ucc.asn.au> parents: 532 diff changeset	430 buffer * writebuf; /* the packet which will go on the wire. This is
805ae74ec024 Encrypt in-place, avoid an extra malloc Matt Johnston <matt@ucc.asn.au> parents: 532 diff changeset	431 encrypted in-place. */
592 afb089e70892 Don't reset last_packet_time when we're transmitting SSH_MSG_IGNORE packets Matt Johnston <matt@ucc.asn.au> parents: 568 diff changeset	432 unsigned char packet_type;
533 805ae74ec024 Encrypt in-place, avoid an extra malloc Matt Johnston <matt@ucc.asn.au> parents: 532 diff changeset	433 unsigned int len, encrypt_buf_size;
805ae74ec024 Encrypt in-place, avoid an extra malloc Matt Johnston <matt@ucc.asn.au> parents: 532 diff changeset	434 unsigned char mac_bytes[MAX_MAC_LEN];
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	435
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	436 TRACE(("enter encrypt_packet()"))
592 afb089e70892 Don't reset last_packet_time when we're transmitting SSH_MSG_IGNORE packets Matt Johnston <matt@ucc.asn.au> parents: 568 diff changeset	437
afb089e70892 Don't reset last_packet_time when we're transmitting SSH_MSG_IGNORE packets Matt Johnston <matt@ucc.asn.au> parents: 568 diff changeset	438 buf_setpos(ses.writepayload, 0);
afb089e70892 Don't reset last_packet_time when we're transmitting SSH_MSG_IGNORE packets Matt Johnston <matt@ucc.asn.au> parents: 568 diff changeset	439 packet_type = buf_getbyte(ses.writepayload);
afb089e70892 Don't reset last_packet_time when we're transmitting SSH_MSG_IGNORE packets Matt Johnston <matt@ucc.asn.au> parents: 568 diff changeset	440 buf_setpos(ses.writepayload, 0);
afb089e70892 Don't reset last_packet_time when we're transmitting SSH_MSG_IGNORE packets Matt Johnston <matt@ucc.asn.au> parents: 568 diff changeset	441
afb089e70892 Don't reset last_packet_time when we're transmitting SSH_MSG_IGNORE packets Matt Johnston <matt@ucc.asn.au> parents: 568 diff changeset	442 TRACE(("encrypt_packet type is %d", packet_type))
452 4cab61369879 Prevent invalid packets being sent during key-exchange, instead queue Matt Johnston <matt@ucc.asn.au> parents: 448 diff changeset	443
623 895fbe068f2c Fix case where "-K 1" would cause a SSH_MSG_IGNORE packet to be sent Matt Johnston <matt@ucc.asn.au> parents: 605 diff changeset	444 if ((!ses.dataallowed && !packet_is_okay_kex(packet_type))
895fbe068f2c Fix case where "-K 1" would cause a SSH_MSG_IGNORE packet to be sent Matt Johnston <matt@ucc.asn.au> parents: 605 diff changeset	445 \|\| ses.kexstate.sentnewkeys) {
452 4cab61369879 Prevent invalid packets being sent during key-exchange, instead queue Matt Johnston <matt@ucc.asn.au> parents: 448 diff changeset	446 /* During key exchange only particular packets are allowed.
592 afb089e70892 Don't reset last_packet_time when we're transmitting SSH_MSG_IGNORE packets Matt Johnston <matt@ucc.asn.au> parents: 568 diff changeset	447 Since this packet_type isn't OK we just enqueue it to send
452 4cab61369879 Prevent invalid packets being sent during key-exchange, instead queue Matt Johnston <matt@ucc.asn.au> parents: 448 diff changeset	448 after the KEX, see maybe_flush_reply_queue */
623 895fbe068f2c Fix case where "-K 1" would cause a SSH_MSG_IGNORE packet to be sent Matt Johnston <matt@ucc.asn.au> parents: 605 diff changeset	449
895fbe068f2c Fix case where "-K 1" would cause a SSH_MSG_IGNORE packet to be sent Matt Johnston <matt@ucc.asn.au> parents: 605 diff changeset	450 /* We also enqueue packets here when we have sent a MSG_NEWKEYS
895fbe068f2c Fix case where "-K 1" would cause a SSH_MSG_IGNORE packet to be sent Matt Johnston <matt@ucc.asn.au> parents: 605 diff changeset	451 * packet but are yet to received one. For simplicity we just switch
895fbe068f2c Fix case where "-K 1" would cause a SSH_MSG_IGNORE packet to be sent Matt Johnston <matt@ucc.asn.au> parents: 605 diff changeset	452 * over all the keys at once. This is the 'ses.kexstate.sentnewkeys'
895fbe068f2c Fix case where "-K 1" would cause a SSH_MSG_IGNORE packet to be sent Matt Johnston <matt@ucc.asn.au> parents: 605 diff changeset	453 * case. */
452 4cab61369879 Prevent invalid packets being sent during key-exchange, instead queue Matt Johnston <matt@ucc.asn.au> parents: 448 diff changeset	454 enqueue_reply_packet();
4cab61369879 Prevent invalid packets being sent during key-exchange, instead queue Matt Johnston <matt@ucc.asn.au> parents: 448 diff changeset	455 return;
4cab61369879 Prevent invalid packets being sent during key-exchange, instead queue Matt Johnston <matt@ucc.asn.au> parents: 448 diff changeset	456 }
4cab61369879 Prevent invalid packets being sent during key-exchange, instead queue Matt Johnston <matt@ucc.asn.au> parents: 448 diff changeset	457
534 0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf Matt Johnston <matt@ucc.asn.au> parents: 533 diff changeset	458 blocksize = ses.keys->trans.algo_crypt->blocksize;
0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf Matt Johnston <matt@ucc.asn.au> parents: 533 diff changeset	459 mac_size = ses.keys->trans.algo_mac->hashsize;
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	460
605 53c21d4ec98a - Don't allow setting memLevel since that doesn't work properly Matt Johnston <matt@ucc.asn.au> parents: 594 diff changeset	461 /* Encrypted packet len is payload+5. We need to then make sure
53c21d4ec98a - Don't allow setting memLevel since that doesn't work properly Matt Johnston <matt@ucc.asn.au> parents: 594 diff changeset	462 * there is enough space for padding or MIN_PACKET_LEN.
53c21d4ec98a - Don't allow setting memLevel since that doesn't work properly Matt Johnston <matt@ucc.asn.au> parents: 594 diff changeset	463 * Add extra 3 since we need at least 4 bytes of padding */
53c21d4ec98a - Don't allow setting memLevel since that doesn't work properly Matt Johnston <matt@ucc.asn.au> parents: 594 diff changeset	464 encrypt_buf_size = (ses.writepayload->len+4+1)
53c21d4ec98a - Don't allow setting memLevel since that doesn't work properly Matt Johnston <matt@ucc.asn.au> parents: 594 diff changeset	465 + MAX(MIN_PACKET_LEN, blocksize) + 3
533 805ae74ec024 Encrypt in-place, avoid an extra malloc Matt Johnston <matt@ucc.asn.au> parents: 532 diff changeset	466 /* add space for the MAC at the end */
592 afb089e70892 Don't reset last_packet_time when we're transmitting SSH_MSG_IGNORE packets Matt Johnston <matt@ucc.asn.au> parents: 568 diff changeset	467 + mac_size
afb089e70892 Don't reset last_packet_time when we're transmitting SSH_MSG_IGNORE packets Matt Johnston <matt@ucc.asn.au> parents: 568 diff changeset	468 #ifndef DISABLE_ZLIB
605 53c21d4ec98a - Don't allow setting memLevel since that doesn't work properly Matt Johnston <matt@ucc.asn.au> parents: 594 diff changeset	469 /* some extra in case 'compression' makes it larger */
592 afb089e70892 Don't reset last_packet_time when we're transmitting SSH_MSG_IGNORE packets Matt Johnston <matt@ucc.asn.au> parents: 568 diff changeset	470 + ZLIB_COMPRESS_INCR
afb089e70892 Don't reset last_packet_time when we're transmitting SSH_MSG_IGNORE packets Matt Johnston <matt@ucc.asn.au> parents: 568 diff changeset	471 #endif
afb089e70892 Don't reset last_packet_time when we're transmitting SSH_MSG_IGNORE packets Matt Johnston <matt@ucc.asn.au> parents: 568 diff changeset	472 /* and an extra cleartext (stripped before transmission) byte for the
afb089e70892 Don't reset last_packet_time when we're transmitting SSH_MSG_IGNORE packets Matt Johnston <matt@ucc.asn.au> parents: 568 diff changeset	473 * packet type */
afb089e70892 Don't reset last_packet_time when we're transmitting SSH_MSG_IGNORE packets Matt Johnston <matt@ucc.asn.au> parents: 568 diff changeset	474 + 1;
501 d58c478bd399 Add support for [email protected] delayed compression. Matt Johnston <matt@ucc.asn.au> parents: 479 diff changeset	475
533 805ae74ec024 Encrypt in-place, avoid an extra malloc Matt Johnston <matt@ucc.asn.au> parents: 532 diff changeset	476 writebuf = buf_new(encrypt_buf_size);
805ae74ec024 Encrypt in-place, avoid an extra malloc Matt Johnston <matt@ucc.asn.au> parents: 532 diff changeset	477 buf_setlen(writebuf, PACKET_PAYLOAD_OFF);
805ae74ec024 Encrypt in-place, avoid an extra malloc Matt Johnston <matt@ucc.asn.au> parents: 532 diff changeset	478 buf_setpos(writebuf, PACKET_PAYLOAD_OFF);
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	479
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	480 #ifndef DISABLE_ZLIB
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	481 /* compression */
501 d58c478bd399 Add support for [email protected] delayed compression. Matt Johnston <matt@ucc.asn.au> parents: 479 diff changeset	482 if (is_compress_trans()) {
605 53c21d4ec98a - Don't allow setting memLevel since that doesn't work properly Matt Johnston <matt@ucc.asn.au> parents: 594 diff changeset	483 int compress_delta;
533 805ae74ec024 Encrypt in-place, avoid an extra malloc Matt Johnston <matt@ucc.asn.au> parents: 532 diff changeset	484 buf_compress(writebuf, ses.writepayload, ses.writepayload->len);
605 53c21d4ec98a - Don't allow setting memLevel since that doesn't work properly Matt Johnston <matt@ucc.asn.au> parents: 594 diff changeset	485 compress_delta = (writebuf->len - PACKET_PAYLOAD_OFF) - ses.writepayload->len;
53c21d4ec98a - Don't allow setting memLevel since that doesn't work properly Matt Johnston <matt@ucc.asn.au> parents: 594 diff changeset	486
53c21d4ec98a - Don't allow setting memLevel since that doesn't work properly Matt Johnston <matt@ucc.asn.au> parents: 594 diff changeset	487 /* Handle the case where 'compress' increased the size. */
53c21d4ec98a - Don't allow setting memLevel since that doesn't work properly Matt Johnston <matt@ucc.asn.au> parents: 594 diff changeset	488 if (compress_delta > ZLIB_COMPRESS_INCR) {
53c21d4ec98a - Don't allow setting memLevel since that doesn't work properly Matt Johnston <matt@ucc.asn.au> parents: 594 diff changeset	489 buf_resize(writebuf, writebuf->size + compress_delta);
53c21d4ec98a - Don't allow setting memLevel since that doesn't work properly Matt Johnston <matt@ucc.asn.au> parents: 594 diff changeset	490 }
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	491 } else
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	492 #endif
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	493 {
533 805ae74ec024 Encrypt in-place, avoid an extra malloc Matt Johnston <matt@ucc.asn.au> parents: 532 diff changeset	494 memcpy(buf_getwriteptr(writebuf, ses.writepayload->len),
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	495 buf_getptr(ses.writepayload, ses.writepayload->len),
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	496 ses.writepayload->len);
533 805ae74ec024 Encrypt in-place, avoid an extra malloc Matt Johnston <matt@ucc.asn.au> parents: 532 diff changeset	497 buf_incrwritepos(writebuf, ses.writepayload->len);
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	498 }
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	499
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	500 /* finished with payload */
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	501 buf_setpos(ses.writepayload, 0);
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	502 buf_setlen(ses.writepayload, 0);
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 /* 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	505 * with a minimum of 4 bytes of padding */
533 805ae74ec024 Encrypt in-place, avoid an extra malloc Matt Johnston <matt@ucc.asn.au> parents: 532 diff changeset	506 padlen = blocksize - (writebuf->len) % blocksize;
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	507 if (padlen < 4) {
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	508 padlen += blocksize;
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 /* check for min packet length */
533 805ae74ec024 Encrypt in-place, avoid an extra malloc Matt Johnston <matt@ucc.asn.au> parents: 532 diff changeset	511 if (writebuf->len + padlen < MIN_PACKET_LEN) {
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	512 padlen += blocksize;
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
533 805ae74ec024 Encrypt in-place, avoid an extra malloc Matt Johnston <matt@ucc.asn.au> parents: 532 diff changeset	515 buf_setpos(writebuf, 0);
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	516 /* packet length excluding the packetlength uint32 */
533 805ae74ec024 Encrypt in-place, avoid an extra malloc Matt Johnston <matt@ucc.asn.au> parents: 532 diff changeset	517 buf_putint(writebuf, writebuf->len + padlen - 4);
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	518
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	519 /* padding len */
533 805ae74ec024 Encrypt in-place, avoid an extra malloc Matt Johnston <matt@ucc.asn.au> parents: 532 diff changeset	520 buf_putbyte(writebuf, padlen);
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	521 /* actual padding */
533 805ae74ec024 Encrypt in-place, avoid an extra malloc Matt Johnston <matt@ucc.asn.au> parents: 532 diff changeset	522 buf_setpos(writebuf, writebuf->len);
805ae74ec024 Encrypt in-place, avoid an extra malloc Matt Johnston <matt@ucc.asn.au> parents: 532 diff changeset	523 buf_incrlen(writebuf, padlen);
805ae74ec024 Encrypt in-place, avoid an extra malloc Matt Johnston <matt@ucc.asn.au> parents: 532 diff changeset	524 genrandom(buf_getptr(writebuf, padlen), padlen);
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	525
534 0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf Matt Johnston <matt@ucc.asn.au> parents: 533 diff changeset	526 make_mac(ses.transseq, &ses.keys->trans, writebuf, writebuf->len, mac_bytes);
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	527
533 805ae74ec024 Encrypt in-place, avoid an extra malloc Matt Johnston <matt@ucc.asn.au> parents: 532 diff changeset	528 /* do the actual encryption, in-place */
805ae74ec024 Encrypt in-place, avoid an extra malloc Matt Johnston <matt@ucc.asn.au> parents: 532 diff changeset	529 buf_setpos(writebuf, 0);
805ae74ec024 Encrypt in-place, avoid an extra malloc Matt Johnston <matt@ucc.asn.au> parents: 532 diff changeset	530 /* encrypt it in-place*/
805ae74ec024 Encrypt in-place, avoid an extra malloc Matt Johnston <matt@ucc.asn.au> parents: 532 diff changeset	531 len = writebuf->len;
534 0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf Matt Johnston <matt@ucc.asn.au> parents: 533 diff changeset	532 if (ses.keys->trans.crypt_mode->encrypt(
533 805ae74ec024 Encrypt in-place, avoid an extra malloc Matt Johnston <matt@ucc.asn.au> parents: 532 diff changeset	533 buf_getptr(writebuf, len),
528 378a6389f88e - Don't be dumb and encrypt/decrypt in a while() loop - why did I do this?? Matt Johnston <matt@ucc.asn.au> parents: 513 diff changeset	534 buf_getwriteptr(writebuf, len),
378a6389f88e - Don't be dumb and encrypt/decrypt in a while() loop - why did I do this?? Matt Johnston <matt@ucc.asn.au> parents: 513 diff changeset	535 len,
534 0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf Matt Johnston <matt@ucc.asn.au> parents: 533 diff changeset	536 &ses.keys->trans.cipher_state) != CRYPT_OK) {
594 a98a2138364a Improve capitalisation for all logged strings Matt Johnston <matt@ucc.asn.au> parents: 592 diff changeset	537 dropbear_exit("Error encrypting");
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	538 }
533 805ae74ec024 Encrypt in-place, avoid an extra malloc Matt Johnston <matt@ucc.asn.au> parents: 532 diff changeset	539 buf_incrpos(writebuf, len);
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	540
533 805ae74ec024 Encrypt in-place, avoid an extra malloc Matt Johnston <matt@ucc.asn.au> parents: 532 diff changeset	541 /* stick the MAC on it */
805ae74ec024 Encrypt in-place, avoid an extra malloc Matt Johnston <matt@ucc.asn.au> parents: 532 diff changeset	542 buf_putbytes(writebuf, mac_bytes, mac_size);
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	543
592 afb089e70892 Don't reset last_packet_time when we're transmitting SSH_MSG_IGNORE packets Matt Johnston <matt@ucc.asn.au> parents: 568 diff changeset	544 /* The last byte of the buffer stores the cleartext packet_type. It is not
afb089e70892 Don't reset last_packet_time when we're transmitting SSH_MSG_IGNORE packets Matt Johnston <matt@ucc.asn.au> parents: 568 diff changeset	545 * transmitted but is used for transmit timeout purposes */
afb089e70892 Don't reset last_packet_time when we're transmitting SSH_MSG_IGNORE packets Matt Johnston <matt@ucc.asn.au> parents: 568 diff changeset	546 buf_putbyte(writebuf, packet_type);
533 805ae74ec024 Encrypt in-place, avoid an extra malloc Matt Johnston <matt@ucc.asn.au> parents: 532 diff changeset	547 /* enqueue the packet for sending. It will get freed after transmission. */
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	548 buf_setpos(writebuf, 0);
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	549 enqueue(&ses.writequeue, (void*)writebuf);
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	550
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	551 /* Update counts */
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	552 ses.kexstate.datatrans += writebuf->len;
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	553 ses.transseq++;
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	554
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	555 TRACE(("leave encrypt_packet()"))
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	556 }
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	557
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	558
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	559 /* Create the packet mac, and append H(seqno\|clearbuf) to the output */
534 0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf Matt Johnston <matt@ucc.asn.au> parents: 533 diff changeset	560 /* output_mac must have ses.keys->trans.algo_mac->hashsize bytes. */
0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf Matt Johnston <matt@ucc.asn.au> parents: 533 diff changeset	561 static void make_mac(unsigned int seqno, const struct key_context_directional * key_state,
0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf Matt Johnston <matt@ucc.asn.au> parents: 533 diff changeset	562 buffer * clear_buf, unsigned int clear_len,
0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf Matt Johnston <matt@ucc.asn.au> parents: 533 diff changeset	563 unsigned char *output_mac) {
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	564 unsigned char seqbuf[4];
228 5e4110bb753a - Fixed twofish algorithm naming so it actually works. Matt Johnston <matt@ucc.asn.au> parents: 194 diff changeset	565 unsigned long bufsize;
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	566 hmac_state hmac;
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	567
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	568 TRACE(("enter writemac"))
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	569
534 0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf Matt Johnston <matt@ucc.asn.au> parents: 533 diff changeset	570 if (key_state->algo_mac->hashsize > 0) {
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	571 /* calculate the mac */
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	572 if (hmac_init(&hmac,
534 0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf Matt Johnston <matt@ucc.asn.au> parents: 533 diff changeset	573 key_state->hash_index,
0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf Matt Johnston <matt@ucc.asn.au> parents: 533 diff changeset	574 key_state->mackey,
0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf Matt Johnston <matt@ucc.asn.au> parents: 533 diff changeset	575 key_state->algo_mac->keysize) != CRYPT_OK) {
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	576 dropbear_exit("HMAC error");
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	577 }
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	578
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	579 /* sequence number */
534 0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf Matt Johnston <matt@ucc.asn.au> parents: 533 diff changeset	580 STORE32H(seqno, seqbuf);
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	581 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	582 dropbear_exit("HMAC error");
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	583 }
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	584
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	585 /* the actual contents */
534 0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf Matt Johnston <matt@ucc.asn.au> parents: 533 diff changeset	586 buf_setpos(clear_buf, 0);
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	587 if (hmac_process(&hmac,
534 0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf Matt Johnston <matt@ucc.asn.au> parents: 533 diff changeset	588 buf_getptr(clear_buf, clear_len),
0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf Matt Johnston <matt@ucc.asn.au> parents: 533 diff changeset	589 clear_len) != CRYPT_OK) {
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	590 dropbear_exit("HMAC error");
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	591 }
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	592
533 805ae74ec024 Encrypt in-place, avoid an extra malloc Matt Johnston <matt@ucc.asn.au> parents: 532 diff changeset	593 bufsize = MAX_MAC_LEN;
805ae74ec024 Encrypt in-place, avoid an extra malloc Matt Johnston <matt@ucc.asn.au> parents: 532 diff changeset	594 if (hmac_done(&hmac, output_mac, &bufsize) != CRYPT_OK) {
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	595 dropbear_exit("HMAC error");
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	596 }
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	597 }
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	598 TRACE(("leave writemac"))
27 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 #ifndef DISABLE_ZLIB
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	602 /* 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	603 * respective current positions. */
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	604 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	605
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	606 unsigned int endpos = src->pos + len;
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	607 int result;
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	608
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	609 TRACE(("enter buf_compress"))
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	610
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	611 while (1) {
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	612
534 0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf Matt Johnston <matt@ucc.asn.au> parents: 533 diff changeset	613 ses.keys->trans.zstream->avail_in = endpos - src->pos;
0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf Matt Johnston <matt@ucc.asn.au> parents: 533 diff changeset	614 ses.keys->trans.zstream->next_in =
0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf Matt Johnston <matt@ucc.asn.au> parents: 533 diff changeset	615 buf_getptr(src, ses.keys->trans.zstream->avail_in);
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	616
534 0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf Matt Johnston <matt@ucc.asn.au> parents: 533 diff changeset	617 ses.keys->trans.zstream->avail_out = dest->size - dest->pos;
0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf Matt Johnston <matt@ucc.asn.au> parents: 533 diff changeset	618 ses.keys->trans.zstream->next_out =
0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf Matt Johnston <matt@ucc.asn.au> parents: 533 diff changeset	619 buf_getwriteptr(dest, ses.keys->trans.zstream->avail_out);
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	620
534 0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf Matt Johnston <matt@ucc.asn.au> parents: 533 diff changeset	621 result = deflate(ses.keys->trans.zstream, Z_SYNC_FLUSH);
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	622
534 0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf Matt Johnston <matt@ucc.asn.au> parents: 533 diff changeset	623 buf_setpos(src, endpos - ses.keys->trans.zstream->avail_in);
0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf Matt Johnston <matt@ucc.asn.au> parents: 533 diff changeset	624 buf_setlen(dest, dest->size - ses.keys->trans.zstream->avail_out);
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	625 buf_setpos(dest, dest->len);
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	626
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	627 if (result != Z_OK) {
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	628 dropbear_exit("zlib error");
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
534 0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf Matt Johnston <matt@ucc.asn.au> parents: 533 diff changeset	631 if (ses.keys->trans.zstream->avail_in == 0) {
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	632 break;
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	633 }
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	634
534 0431915df79f - Get rid of decryptreadbuf, just decrypt in-place with readbuf Matt Johnston <matt@ucc.asn.au> parents: 533 diff changeset	635 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	636
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	637 /* 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	638 * 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	639 * but it is possible */
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	640 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	641
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	642 }
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	643 TRACE(("leave buf_compress"))
27 08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	644 }
08da099e8337 - Rename common-packet.c to packet.c Matt Johnston <matt@ucc.asn.au> parents: diff changeset	645 #endif

Mercurial > dropbear

annotate packet.c @ 654:818108bf7749