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Description: Change default of MaxStartups to 10:30:100
This causes sshd to start doing random early drop at 10 connections up to
100 connections. This will make it harder to DoS as CPUs have come a long
way since the original value was set back in 2000.
Author: Darren Tucker
Origin: http://www.openbsd.org/cgi-bin/cvsweb/src/usr.bin/ssh/servconf.c?r1=1.234#rev1.234
Origin: http://www.openbsd.org/cgi-bin/cvsweb/src/usr.bin/ssh/sshd_config.5?r1=1.156#rev1.156
Origin: http://www.openbsd.org/cgi-bin/cvsweb/src/usr.bin/ssh/sshd_config?r1=1.89#rev1.89
Bug-Debian: http://bugs.debian.org/700102
Forwarded: not-needed
Last-Update: 2013-02-08
Index: b/servconf.c
===================================================================
--- a/servconf.c
+++ b/servconf.c
@@ -264,11 +264,11 @@
if (options->gateway_ports == -1)
options->gateway_ports = 0;
if (options->max_startups == -1)
- options->max_startups = 10;
+ options->max_startups = 100;
if (options->max_startups_rate == -1)
- options->max_startups_rate = 100; /* 100% */
+ options->max_startups_rate = 30; /* 30% */
if (options->max_startups_begin == -1)
- options->max_startups_begin = options->max_startups;
+ options->max_startups_begin = 10;
if (options->max_authtries == -1)
options->max_authtries = DEFAULT_AUTH_FAIL_MAX;
if (options->max_sessions == -1)
Index: b/sshd_config
===================================================================
--- a/sshd_config
+++ b/sshd_config
@@ -108,7 +108,7 @@
#ClientAliveCountMax 3
#UseDNS yes
#PidFile /var/run/sshd.pid
-#MaxStartups 10
+#MaxStartups 10:30:100
#PermitTunnel no
#ChrootDirectory none
#VersionAddendum none
Index: b/sshd_config.5
===================================================================
--- a/sshd_config.5
+++ b/sshd_config.5
@@ -781,7 +781,7 @@
Additional connections will be dropped until authentication succeeds or the
.Cm LoginGraceTime
expires for a connection.
-The default is 10.
+The default is 10:30:100.
.Pp
Alternatively, random early drop can be enabled by specifying
the three colon separated values
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