group_vars/all was enabling just the sshd jail so move this into the
fail2ban role defaults. patchwork, security and wiki were redefining
fail2ban_jails without deviating from the group_vars/all default and
can therefore be dropped.

Fixes: 26f289b7 ("Capitalize the first letter of all task names")

ansible-lint 6.5.0 complains about:

  name: All names should start with an
        uppercase letter. (name[casing])

Add a default rate limit for 20 req/s for the uwsgi endpoint and
automatically ban users who reach this limit. The nginx-limit-req rule
does not ban users who reach the rss limit as these are not likely DoS
attempts.

Leonidas Spyropoulos authored 3 years ago and Jelle van der Waa committed 3 years ago

Signed-off-by: Leonidas Spyropoulos <artafinde@gmail.com>

yaml: truthy value should be one of [false, true] (truthy)
yaml: wrong indentation: expected 4 but found 2 (indentation)
yaml: too few spaces before comment (comments)
yaml: missing starting space in comment (comments)
yaml: too many blank lines (1 > 0) (empty-lines)
yaml: too many spaces after colon (colons)
yaml: comment not indented like content (comments-indentation)
yaml: no new line character at the end of file (new-line-at-end-of-file)
load-failure: Failed to load or parse file
parser-error: couldn't resolve module/action 'hosts'. This often indicates a misspelling, missing collection, or incorrect module path.

fail2ban role now protects postfix, dovecot and sshd. other roles can drop
configuration files into /etc/fail2ban/jail.d/*.local to enable fail2ban to
monitor it's service.

This bans all requests exceeding 1/min in a time period of 30 minutes.
This might be too harse and can be adjusted later.