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Implement this year's consensus on CHANNEL_FAILURE vs CHANNEL_CLOSE.

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We now expect that after the server has sent us CHANNEL_CLOSE, we
should not expect to see any replies to our outstanding channel
requests, and conversely after we have sent CHANNEL_CLOSE we avoid
sending any reply to channel requests from the server. This was the
consensus among implementors discussing the problem on ietf-ssh in
April 2014.

To cope with current OpenSSH's (and perhaps other servers we don't
know about yet) willingness to send request replies after
CHANNEL_CLOSE, I introduce a bug-compatibility flag which is detected
for every OpenSSH version up to and including the current 6.6 - but
not beyond, since https://bugzilla.mindrot.org/show_bug.cgi?id=1818
promises that 6.7 will also implement the new consensus behaviour.

[originally from svn r10200]
This commit is contained in:
Simon Tatham
2014-07-06 14:05:39 +00:00
parent 3d337b49ef
commit aaaf70a0fc
6 changed files with 78 additions and 5 deletions
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2
settings.c
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@ -626,6 +626,7 @@ void save_open_settings(void *sesskey, Conf *conf)
write_setting_i(sesskey, "BugRekey2", 2-conf_get_int(conf, CONF_sshbug_rekey2));
write_setting_i(sesskey, "BugMaxPkt2", 2-conf_get_int(conf, CONF_sshbug_maxpkt2));
write_setting_i(sesskey, "BugWinadj", 2-conf_get_int(conf, CONF_sshbug_winadj));
write_setting_i(sesskey, "BugChanReq", 2-conf_get_int(conf, CONF_sshbug_chanreq));
write_setting_i(sesskey, "StampUtmp", conf_get_int(conf, CONF_stamp_utmp));
write_setting_i(sesskey, "LoginShell", conf_get_int(conf, CONF_login_shell));
write_setting_i(sesskey, "ScrollbarOnLeft", conf_get_int(conf, CONF_scrollbar_on_left));
@ -970,6 +971,7 @@ void load_open_settings(void *sesskey, Conf *conf)
i = gppi_raw(sesskey, "BugRekey2", 0); conf_set_int(conf, CONF_sshbug_rekey2, 2-i);
i = gppi_raw(sesskey, "BugMaxPkt2", 0); conf_set_int(conf, CONF_sshbug_maxpkt2, 2-i);
i = gppi_raw(sesskey, "BugWinadj", 0); conf_set_int(conf, CONF_sshbug_winadj, 2-i);
i = gppi_raw(sesskey, "BugChanReq", 0); conf_set_int(conf, CONF_sshbug_chanreq, 2-i);
conf_set_int(conf, CONF_ssh_simple, FALSE);
gppi(sesskey, "StampUtmp", 1, conf, CONF_stamp_utmp);
gppi(sesskey, "LoginShell", 1, conf, CONF_login_shell);