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90 lines
5 KiB
Plaintext
90 lines
5 KiB
Plaintext
# PAM configuration for the Secure Shell service
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# instantly fail if /etc/nologin exists and user is not root:
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auth requisite pam_nologin.so
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# --- PASSWORD CHECK SECTION
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# proceed in this section ONLY if the user is in group mfa-password-configd, skip it entirely otherwise (4 lines -> next section)
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auth [success=ignore ignore=ignore default=4] pam_succeed_if.so quiet user ingroup mfa-password-configd
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# just display a nice message to the user:
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auth optional pam_echo.so Your account has Multi-Factor Authentication enabled, an additional authentication factor is required (password).
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# also display how many days remain before expiration of their password:
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auth optional pam_exec.so quiet debug stdout /opt/bastion/bin/shell/pam_exec_pwd_info.sh
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# lock account after 6 failures, for 5 minutes
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auth required pam_tally2.so onerr=fail deny=6 unlock_time=300
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# now actually ask for the password, and skip the next line if it's correct:
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auth required pam_unix.so
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# --- TOTP CHECK SECTION
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# if root is logging in, enable TOTP check in all cases (nullok is used below, so if TOTP is not configured for root, it'll pass through):
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auth [success=ignore ignore=ignore default=1] pam_succeed_if.so quiet uid eq 0
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# [success=ok new_authtok_reqd=ok ignore=ignore default=bad module_unknown=ignore] == required + module_unknown:ignore
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# if you have a recent enough libpam-google-authenticator, you can customize the prompt with the following option: [authtok_prompt=Verification Code (OTP): ]
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# you can also add "debug" for more verbose logs (requires a not too old version of the pam module)
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# note the nullok parameter, instructing that if TOTP is not configured for root, it shouldn't be asked
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# if you know you've configured TOTP for root and prefer blocking access if there is a problem with the secret file, remove `nullok'
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auth [success=ok new_authtok_reqd=ok ignore=ignore default=bad module_unknown=ignore] pam_google_authenticator.so nullok secret=/var/otp/root
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# if root, TOTP check has already been done just above, so skip this subsection (3 lines -> next section):
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auth [success=3 ignore=ignore default=ignore] pam_succeed_if.so quiet uid eq 0
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# else (if not root), proceed in this subsection ONLY if the user is in group mfa-totp-configd, skip it entirely otherwise (2 lines -> next section):
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auth [success=ignore ignore=ignore default=2] pam_succeed_if.so quiet user ingroup mfa-totp-configd
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# just display a nice message to the user:
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auth optional pam_echo.so Multi-Factor Authentication enabled, an additional authentication factor is required (OTP).
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# now actually ask for the TOTP:
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auth [success=ok new_authtok_reqd=ok ignore=ignore default=bad module_unknown=ignore] pam_google_authenticator.so secret=~/.otp
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# Read environment variables from /etc/environment and
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# /etc/security/pam_env.conf.
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session required pam_env.so # [1]
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# In Debian 4.0 (etch), locale-related environment variables were moved to
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# /etc/default/locale, so read that as well.
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session required pam_env.so user_readenv=1 envfile=/etc/default/locale
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# Disallow non-root logins when /etc/nologin exists.
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account required pam_nologin.so
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# Reset counter if auth succeeded
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account required pam_tally2.so
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# Uncomment and edit /etc/security/access.conf if you need to set complex
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# access limits that are hard to express in sshd_config.
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# account required pam_access.so
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# Standard Un*x authorization.
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@include common-account
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# Standard Un*x session setup and teardown.
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@include common-session
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# Print the message of the day upon successful login.
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session optional pam_motd.so noupdate
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# Print the status of the user's mailbox upon successful login.
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#session optional pam_mail.so standard noenv # [1]
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# Set up user limits from /etc/security/limits.conf.
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session required pam_limits.so
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# Set the loginuid process attribute.
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session required pam_loginuid.so
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# Create a new session keyring.
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session optional pam_keyinit.so force revoke
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# SELinux needs to be the first session rule. This ensures that any
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# lingering context has been cleared. Without this it is possible that a
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# module could execute code in the wrong domain.
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session [success=ok ignore=ignore module_unknown=ignore default=bad] pam_selinux.so close
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# SELinux needs to intervene at login time to ensure that the process starts
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# in the proper default security context. Only sessions which are intended
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# to run in the user's context should be run after this.
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session [success=ok ignore=ignore module_unknown=ignore default=bad] pam_selinux.so open
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# Standard Un*x password updating.
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@include common-password
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