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Fix MAC bug which would prevent asymmetric hashes

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This commit is contained in:
Matt Johnston 2013-04-03 23:54:58 +08:00
parent a2f70a3751
commit e2c813df4d
1 changed files with 6 additions and 9 deletions
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15
packet.c
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@ -74,6 +74,8 @@ void write_packet() {
len = writebuf->len - 1 - writebuf->pos;
dropbear_assert(len > 0);
all_ignore &= (packet_type == SSH_MSG_IGNORE);
TRACE2(("write_packet writev #%d type %d len %d/%d", i, packet_type,
len, writebuf->len-1))
iov[i].iov_base = buf_getptr(writebuf, len);
iov[i].iov_len = len;
}
@ -366,7 +368,7 @@ static int checkmac() {
unsigned char mac_bytes[MAX_MAC_LEN];
unsigned int mac_size, contents_len;
mac_size = ses.keys->trans.algo_mac->hashsize;
mac_size = ses.keys->recv.algo_mac->hashsize;
contents_len = ses.readbuf->len - mac_size;
buf_setpos(ses.readbuf, 0);
@ -455,7 +457,6 @@ static void enqueue_reply_packet() {
ses.reply_queue_head = new_item;
}
ses.reply_queue_tail = new_item;
TRACE2(("leave enqueue_reply_packet"))
}
void maybe_flush_reply_queue() {
@ -500,16 +501,12 @@ void encrypt_packet() {
TRACE2(("encrypt_packet type is %d", packet_type))
if ((!ses.dataallowed && !packet_is_okay_kex(packet_type))
|| ses.kexstate.sentnewkeys) {
if ((!ses.dataallowed && !packet_is_okay_kex(packet_type))) {
/* During key exchange only particular packets are allowed.
Since this packet_type isn't OK we just enqueue it to send
after the KEX, see maybe_flush_reply_queue */
/* We also enqueue packets here when we have sent a MSG_NEWKEYS
* packet but are yet to received one. For simplicity we just switch
* over all the keys at once. This is the 'ses.kexstate.sentnewkeys'
* case. */
TRACE2(("Delay sending reply packet. dataallowed %d, type %d, sentnewkeys %d",
ses.dataallowed, packet_type, ses.kexstate.sentnewkeys))
enqueue_reply_packet();
return;
}