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[backport] Add rate limiting of SSH in the firewall (#1770) 

See #1767. Backport of cfc8fb484c.
This commit is contained in:
Marcus Bointon 2020-06-07 15:47:51 +02:00 committed by Joshua Tauberer
parent 2c34a6df2b
commit f253c40012
3 changed files with 16 additions and 5 deletions
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9
setup/functions.sh
View File

@ -136,7 +136,14 @@ function get_default_privateip {
function ufw_allow {
if [ -z "${DISABLE_FIREWALL:-}" ]; then
# ufw has completely unhelpful output
ufw allow $1 > /dev/null;
ufw allow "$1" > /dev/null;
fi
}
function ufw_limit {
if [ -z "${DISABLE_FIREWALL:-}" ]; then
# ufw has completely unhelpful output
ufw limit "$1" > /dev/null;
fi
}

4
setup/system.sh
View File

@ -256,7 +256,7 @@ if [ -z "${DISABLE_FIREWALL:-}" ]; then
apt_install ufw
# Allow incoming connections to SSH.
ufw_allow ssh;
ufw_limit ssh;
# ssh might be running on an alternate port. Use sshd -T to dump sshd's #NODOC
# settings, find the port it is supposedly running on, and open that port #NODOC
@ -266,7 +266,7 @@ if [ -z "${DISABLE_FIREWALL:-}" ]; then
if [ "$SSH_PORT" != "22" ]; then
echo Opening alternate SSH port $SSH_PORT. #NODOC
ufw_allow $SSH_PORT #NODOC
ufw_limit $SSH_PORT #NODOC
fi
fi

8
tools/readable_bash.py
View File

@ -58,7 +58,7 @@ def generate_documentation():
}
.prose {
padding-top: 1em;
padding-top: 1em;
padding-bottom: 1em;
}
.terminal {
@ -261,6 +261,10 @@ class UfwAllow(Grammar):
grammar = (ZERO_OR_MORE(SPACE), L("ufw_allow "), REST_OF_LINE, EOL)
def value(self):
return shell_line("ufw allow " + self[2].string)
class UfwLimit(Grammar):
grammar = (ZERO_OR_MORE(SPACE), L("ufw_limit "), REST_OF_LINE, EOL)
def value(self):
return shell_line("ufw limit " + self[2].string)
class RestartService(Grammar):
grammar = (ZERO_OR_MORE(SPACE), L("restart_service "), REST_OF_LINE, EOL)
def value(self):
@ -275,7 +279,7 @@ class OtherLine(Grammar):
return "<pre class='shell'><div>" + recode_bash(self.string.strip()) + "</div></pre>\n"
class BashElement(Grammar):
grammar = Comment | CatEOF | EchoPipe | EchoLine | HideOutput | EditConf | SedReplace | AptGet | UfwAllow | RestartService | OtherLine
grammar = Comment | CatEOF | EchoPipe | EchoLine | HideOutput | EditConf | SedReplace | AptGet | UfwAllow | UfwLimit | RestartService | OtherLine
def value(self):
return self[0].value()