Without this, any users that don't have a mapping configured may be locked out. This means the pam-u2f module will succeed if the authenticating user doesn't have an authorization mapping. If the PAM module fails, then the failure is ignored and PAM continues with the next module.Īllows finer-grained control based on the return value of the given PAM module. If the given PAM module succeeds, authentication succeeds and the other PAM modules are not executed. If the PAM module fails, other PAM modules are still executed (even though it is already certain that the service itself will be denied). The given PAM module must succeed in order for the entire service (such as authentication) to succeed. While configuring /etc/pam.d/system-auth, several options will be used: Support for raw USB HID devices is required in the kernel for the YubiKey to function.Īdditional configuration may be needed for successful authentication over SSH if both password and YubiKey are required. This can be a central file such as /etc/u2f_mappings or a per-user file such as ~/.config/Yubico/u2f_keys. In order to use a YubiKey with PAM, a file which maps users to their YubiKeys is needed. When a username and password are used for authentication, PAM typically uses a combination of the /etc/passwd and /etc/shadow files to map users to their passwords. PAM can be configured to use a YubiKey to complement, or even replace, traditional password-based authentication. It is also used by privilege escalation programs such as doas and sudo. PAM is the central authentication service that is used when logging in through a TTY, a login manager, a screensaver application, and sometimes when over ssh. 4.2 Fixing PAM through single-user mode.3.3.5 Requiring a password or a YubiKey.3.3.4 Requiring a password and a YubiKey.3.2.2 Creating user-token mapping (central file).3.2.1 Creating user-token mapping (per-user file).
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