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Yes—but “without a password” usually means you do not type the Linux account password, not that the system skips authentication. For remote access, SSH public-key authentication is the best-documented general-purpose option: the server accepts your public key, while you prove possession of its private half. Empty-password access and local desktop sign-in are separate, distribution-dependent matters.
Can I log into Linux without a password?
Yes. For a remote Linux server, you can use SSH public-key authentication so you do not enter the remote account password at each connection. The OpenSSH ssh(1) manual says, “After this, the user can log in without giving the password.” That describes a different authentication method—not an account with no password and not an authentication-free login.
In a typical setup, your client keeps the private key and the server authorizes the matching public key in ~/.ssh/authorized_keys. The private key should remain under your control; the server uses the public key to verify that the connection is backed by the corresponding private key. OpenSSH documents ECDSA, Ed25519, and RSA key algorithms, as well as FIDO authenticator-hosted ECDSA and Ed25519 variants. See the OpenSSH ssh(1) manual.
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| Approach | Where it applies | What authenticates you | Important dependency |
|---|---|---|---|
| SSH public-key authentication | Remote SSH connections | Possession of the private key corresponding to a server-authorized public key | Server policy and account accessibility |
| Empty account password | Potentially password-based access paths, depending on configuration | No password string | OpenSSH and PAM controls; not a substitute for public-key authentication |
| Automatic local or graphical sign-in | Local console or desktop session | Depends on the distribution, PAM stack, and display-manager configuration | Local platform-specific support and policy |
| systemd-homed account management | Systems configured to use systemd-homed | Login credentials and signed user records, according to the configured design | systemd-homed integration; it is not a universal desktop default |
How to use SSH keys instead of the remote account password
SSH key login still authenticates you. The main convenience is that the server can verify a key rather than asking for the account password. Depending on your key and setup, you may still need to unlock the private key locally, and server policy may require another authentication step.
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- Create a key pair. Use an OpenSSH-supported key type on the client. The exact command and key options depend on your operating system and security requirements; the OpenSSH client manual documents key generation and supported authentication methods.
- Install the public key on the server. Place the public half in the target account’s
~/.ssh/authorized_keys. Keep the private half on the client or in a supported authenticator; do not copy it to the server. - Check server policy and account state. The server must permit public-key authentication, any additional required methods must be satisfied, and the account must remain accessible to
sshd. - Test a new SSH session before changing access policy. Keep a working administrative session or another recovery route until you have confirmed the new login works. Configuration changes can otherwise leave you without a way back in.
Why a key may not be enough
OpenSSH server policy determines which methods are accepted. The sshd_config(5) manual documents controls including PubkeyAuthentication, PasswordAuthentication, KbdInteractiveAuthentication, PermitEmptyPasswords, PermitRootLogin, and AuthenticationMethods. In particular, AuthenticationMethods can require a sequence of methods, so an accepted public key may not by itself complete login. Disabling one password-related option does not necessarily disable keyboard-interactive or PAM-backed authentication.
Do not assume a configuration file’s visible line tells you the effective policy. OpenSSH settings and included configuration files vary by installed build and host. Check the configuration that applies to the target server, user, and connection, and consult the OpenSSH sshd_config(5) manual for the relevant directives.
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Account locking can block key access
Authentication method and account accessibility are distinct checks. The OpenSSH sshd(8) manual notes that Linux systems commonly mark a locked account with a leading ! in the password field, but account-lock semantics depend on the system. Because sshd checks whether the account is accessible regardless of the authentication method, do not assume that locking a password with a generic account-management command preserves public-key login. Check your distribution’s behavior and test with a safe recovery path.
Why an empty password is not passwordless SSH
An empty account password means the password field is blank; public-key authentication instead proves possession of a key. OpenSSH’s PermitEmptyPasswords setting concerns password authentication and is documented with a default of no. The traditional PAM pam_unix module also denies access when the official password is blank by default. These controls are separate, and allowing an empty password is not the recommended route to convenient SSH access. See the Linux-PAM pam_unix(8) manual.
Can you skip the password on a Linux desktop?
Local console and graphical logins use PAM and distribution-specific components. There is no universal procedure that applies to every Linux distribution, desktop environment, and display manager. Whether automatic sign-in, biometrics, or another local method is available depends on those components and their configuration. Follow the documentation for your distribution and desktop rather than applying an SSH server setting to a local login.
Where systemd-homed fits
systemd-homed is a distinct way to manage home areas and user records, not a general switch that removes conventional password prompts from Linux desktops. Its documented design can associate locally permitted logins with signed user records whose corresponding public key is installed. Home areas may be encrypted; with per-user encryption, the encryption key can be derived from the authentication credential supplied at login. The pam_systemd_home(8) manual describes authenticating users and activating managed home directories at login, then deactivating them after the last session ends. Further details are in the systemd-homed.service(8) manual.
Should you use a hardware-backed SSH key?
Ordinary software-generated SSH keys do not require special hardware. If you specifically want a hardware-backed SSH key, OpenSSH supports FIDO authenticator-hosted ECDSA and Ed25519 key types. A compatible FIDO security key is optional; support depends on the client, server, authenticator, and configuration.
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For FIDO key types, the server can use touch-required to require presence confirmation, usually a touch, and verify-required to require user verification such as a PIN. Those options apply to the FIDO types, not ordinary non-FIDO keys. The OpenSSH server configuration manual documents these controls. No single security-key model is established as compatible with every setup, so verify compatibility across your client and server before relying on one.
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Choose based on convenience, policy, and recovery
- For remote server access: start with SSH public-key authentication if the server permits it and the account remains accessible.
- If the server requires multiple methods: follow its configured sequence; a key alone may not be sufficient.
- For local desktop access: check your distribution and display-manager documentation because local sign-in is not governed by a universal SSH recipe.
- If considering a FIDO key: treat it as an optional hardware-backed form of SSH authentication and confirm support throughout your setup.
- Before changing account or SSH policy: keep a tested route to administrative access and consider what happens if your private key or authenticator is unavailable.
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