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Don't advertise ext-info-[cs] during rekeys.

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Apart from being pointless, it also triggers a bug in OpenSSH pre-8.1
that causes it to send a repeat EXT_INFO after the rekey concludes,
which trips our quite draconian check for whether EXT_INFO has been
sent at the right time.

The OpenSSH bug: https://bugzilla.mindrot.org/show_bug.cgi?id=2929
This commit is contained in:
Simon Tatham 2020-11-24 20:54:07 +00:00
parent 8dfc39bfb4
commit 12d483a148
1 changed files with 1 additions and 1 deletions
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2
ssh2transport.c
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@ -837,7 +837,7 @@ static void ssh2_write_kexinit_lists(
add_to_commasep(list, kexlists[i][j].name);
}
}
if (i == KEXLIST_KEX) {
if (i == KEXLIST_KEX && first_time) {
if (our_hostkeys) /* we're the server */
add_to_commasep(list, "ext-info-s");
else /* we're the client */