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ansible-personal/roles/common/defaults/main.yml

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roles/common: Add support for fail2ban This is active banning of IPs that are brute forcing login attempts to SSH, versus the passive banning of 10,000 abusive IPs from the abuseipdb.com blacklist. For now I am banning IPs that fail to log in successfully more than twelve times in a one-hour period, but these settings might change, and I can override them at the group and host level if needed. Currently this works for CentOS 7, Ubuntu 16.04, and Ubuntu 18.04, with minor differences in the systemd configuration due to older versions on some distributions. You can see the status of the jail like this: # fail2ban-client status sshd Status for the jail: sshd |- Filter | |- Currently failed: 0 | |- Total failed: 0 | `- Journal matches: _SYSTEMD_UNIT=sshd.service + _COMM=sshd `- Actions |- Currently banned: 1 |- Total banned: 1 `- Banned IP list: 106.13.112.20 You can unban IPs like this: # fail2ban-client set sshd unbanip 106.13.112.20
2019-10-26 16:36:07 +02:00
---
#file - roles/common/defaults/main.yml
roles/common: Fix fail2ban ignoreip According to jail.conf we actually need to separate multiple values with spaces instead of commas. On some versions of fail2ban this is a fatal error: > CRITICAL Unhandled exception in Fail2Ban: > Traceback (most recent call last): > File "/usr/lib/python3/dist-packages/fail2ban/server/jailthread.py", line 66, in run_with_except_hook > run(*args, **kwargs) > File "/usr/lib/python3/dist-packages/fail2ban/server/filtersystemd.py", line 246, in run > *self.formatJournalEntry(logentry)) > File "/usr/lib/python3/dist-packages/fail2ban/server/filter.py", line 432, in processLineAndAdd > if self.inIgnoreIPList(ip, log_ignore=True): > File "/usr/lib/python3/dist-packages/fail2ban/server/filter.py", line 371, in inIgnoreIPList > "(?<=b)1+", bin(DNSUtils.addr2bin(s[1]))).group()) > File "/usr/lib/python3/dist-packages/fail2ban/server/filter.py", line 928, in addr2bin > return struct.unpack("!L", socket.inet_aton(ipstring))[0] > OSError: illegal IP address string passed to inet_aton This affects (at least) fail2ban 0.9.3 on Ubuntu 16.04, but I never noticed.
2021-08-12 14:24:50 +02:00
# add a dummy API key for AbuseIPDB.com (override with real one in host_vars)
abuseipdb_api_key: dummy
roles/common: Add support for fail2ban This is active banning of IPs that are brute forcing login attempts to SSH, versus the passive banning of 10,000 abusive IPs from the abuseipdb.com blacklist. For now I am banning IPs that fail to log in successfully more than twelve times in a one-hour period, but these settings might change, and I can override them at the group and host level if needed. Currently this works for CentOS 7, Ubuntu 16.04, and Ubuntu 18.04, with minor differences in the systemd configuration due to older versions on some distributions. You can see the status of the jail like this: # fail2ban-client status sshd Status for the jail: sshd |- Filter | |- Currently failed: 0 | |- Total failed: 0 | `- Journal matches: _SYSTEMD_UNIT=sshd.service + _COMM=sshd `- Actions |- Currently banned: 1 |- Total banned: 1 `- Banned IP list: 106.13.112.20 You can unban IPs like this: # fail2ban-client set sshd unbanip 106.13.112.20
2019-10-26 16:36:07 +02:00
fail2ban_maxretry: 6
# 1 hour in seconds
fail2ban_findtime: 3600
# 2 weeks in seconds
fail2ban_bantime: 1209600
roles/common: Fix fail2ban ignoreip According to jail.conf we actually need to separate multiple values with spaces instead of commas. On some versions of fail2ban this is a fatal error: > CRITICAL Unhandled exception in Fail2Ban: > Traceback (most recent call last): > File "/usr/lib/python3/dist-packages/fail2ban/server/jailthread.py", line 66, in run_with_except_hook > run(*args, **kwargs) > File "/usr/lib/python3/dist-packages/fail2ban/server/filtersystemd.py", line 246, in run > *self.formatJournalEntry(logentry)) > File "/usr/lib/python3/dist-packages/fail2ban/server/filter.py", line 432, in processLineAndAdd > if self.inIgnoreIPList(ip, log_ignore=True): > File "/usr/lib/python3/dist-packages/fail2ban/server/filter.py", line 371, in inIgnoreIPList > "(?<=b)1+", bin(DNSUtils.addr2bin(s[1]))).group()) > File "/usr/lib/python3/dist-packages/fail2ban/server/filter.py", line 928, in addr2bin > return struct.unpack("!L", socket.inet_aton(ipstring))[0] > OSError: illegal IP address string passed to inet_aton This affects (at least) fail2ban 0.9.3 on Ubuntu 16.04, but I never noticed.
2021-08-12 14:24:50 +02:00
fail2ban_ignoreip: 127.0.0.1/8 172.26.0.0/16 192.168.5.0/24
roles/common: Add support for fail2ban This is active banning of IPs that are brute forcing login attempts to SSH, versus the passive banning of 10,000 abusive IPs from the abuseipdb.com blacklist. For now I am banning IPs that fail to log in successfully more than twelve times in a one-hour period, but these settings might change, and I can override them at the group and host level if needed. Currently this works for CentOS 7, Ubuntu 16.04, and Ubuntu 18.04, with minor differences in the systemd configuration due to older versions on some distributions. You can see the status of the jail like this: # fail2ban-client status sshd Status for the jail: sshd |- Filter | |- Currently failed: 0 | |- Total failed: 0 | `- Journal matches: _SYSTEMD_UNIT=sshd.service + _COMM=sshd `- Actions |- Currently banned: 1 |- Total banned: 1 `- Banned IP list: 106.13.112.20 You can unban IPs like this: # fail2ban-client set sshd unbanip 106.13.112.20
2019-10-26 16:36:07 +02:00
roles/common: default to disabling SSH passwords
2023-08-10 22:09:03 +02:00
# Disable SSH passwords. Must use SSH keys. This is OK because we add the keys
# before re-configuring the SSH daemon to disable passwords.
ssh_password_authentication: disabled
roles/common: Add support for fail2ban This is active banning of IPs that are brute forcing login attempts to SSH, versus the passive banning of 10,000 abusive IPs from the abuseipdb.com blacklist. For now I am banning IPs that fail to log in successfully more than twelve times in a one-hour period, but these settings might change, and I can override them at the group and host level if needed. Currently this works for CentOS 7, Ubuntu 16.04, and Ubuntu 18.04, with minor differences in the systemd configuration due to older versions on some distributions. You can see the status of the jail like this: # fail2ban-client status sshd Status for the jail: sshd |- Filter | |- Currently failed: 0 | |- Total failed: 0 | `- Journal matches: _SYSTEMD_UNIT=sshd.service + _COMM=sshd `- Actions |- Currently banned: 1 |- Total banned: 1 `- Banned IP list: 106.13.112.20 You can unban IPs like this: # fail2ban-client set sshd unbanip 106.13.112.20
2019-10-26 16:36:07 +02:00
# vim: set ts=2 sw=2:
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