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RHEL-10-700600 RHEL 10 must be configured so that SSHD accepts public key authentication.

DISA STIG library V1R3
All changes in this version
first version loaded CAT II

Maps to IA-2(1), IA-2(2) via CCI-000765, CCI-000766

Title

RHEL 10 must be configured so that SSHD accepts public key authentication.

Control

Note: If the system administrator demonstrates the use of an approved alternate multifactor authentication method, this requirement is not applicable. Verify RHEL 10 SSH daemons accept public key encryption with the following command: $ sudo /usr/sbin/sshd -dd 2>&1 | awk '/filename/ {print $4}' | tr -d '\r' | tr '\n' ' ' | xargs sudo grep -iH '^\s*pubkeyauthentication' /etc/ssh/sshd_config.d/10-stig.conf:PubkeyAuthentication yes Verify the runtime setting with the following command: $ sudo sshd -T | grep -i pubkeyauthentication pubkeyauthentication yes If the "PubkeyAuthentication" keyword is not set to "yes" in a drop-in that lexicographically precedes 50-redhat.conf, or if no output is returned, this is a finding.

Discussion

Without the use of multifactor authentication, the ease of access to privileged functions is greatly increased. Multifactor authentication requires using two or more factors to achieve authentication. A privileged account is defined as an information system account with authorizations of a privileged user. A DoW common access card (CAC) with DoW-approved PKI is an example of multifactor authentication. OpenSSH uses the first occurrence of a keyword it sees, and drop-in files are read in lexicographical order at the start of the configuration. Red Hat recommends using drop-in files rather than changing base configuration files. Satisfies: SRG-OS-000105-GPOS-00052, SRG-OS-000106-GPOS-00053, SRG-OS-000107-GPOS-00054, SRG-OS-000108-GPOS-00055

Related controls

CCI-000765, CCI-000766

Fix

Configure RHEL 10 to accept public key authentication. In "/etc/ssh/sshd_config.d", create a drop file that will lexicographically precede 50-redhat.conf and add the following line: PubkeyAuthentication yes Restart the SSH daemon with the following command for the settings to take effect: $ sudo systemctl restart sshd.service