#!/usr/bin/env bash

# a generic helper function unifying the specific checks executed on a running
# image instance
verify_image() {
    SSH_USER="$1"
    SSH_MACHINE="$2"
    SSH_OPTS="-o StrictHostKeyChecking=no $3"
    rlLogInfo "verify_image: SSH_OPTS:'$SSH_OPTS' SSH_USER:'$SSH_USER' SSH_MACHINE: '$SSH_MACHINE'"
    check_root_account "$@"
    check_kernel_cmdline "$@"
}

check_root_account() {
# Try to SSH to a remote machine first using root account using password-based
# auth (this is expected to fail) and then using key-based auth with the
# supplied username to check content of /etc/shadow and audit.log.
#
# use: check_root_account <user> <machine> [ssh options]

    ROOT_ACCOUNT_LOCKED=${ROOT_ACCOUNT_LOCKED:-1}
    if [[ "$SSH_USER" == "" || "$SSH_MACHINE" == "" ]]; then
        rlFail "check_root_account: Missing user or machine parameter."
        return 1
    fi

    if [ $ROOT_ACCOUNT_LOCKED == 0 ]; then
        rlRun -t -c "ssh $SSH_OPTS ${SSH_USER}@${SSH_MACHINE} \"sudo grep '^root::' /etc/shadow\"" \
            0 "Password for root account in /etc/shadow is empty"
    else
        # ssh returns 255 in case of any ssh error, so it's better to grep the specific error message
        rlRun -t -c "ssh $SSH_OPTS -o PubkeyAuthentication=no root@${SSH_MACHINE} 2>&1 | grep -i 'permission denied ('" \
            0 "Can't ssh to '$SSH_MACHINE' as root using password-based auth"
        rlRun -t -c "ssh $SSH_OPTS ${SSH_USER}@${SSH_MACHINE} \"sudo grep -E '^root:(\*LOCK\*|!)' /etc/shadow\"" \
            0 "root account is disabled in /etc/shadow"
        rlRun -t -c "ssh $SSH_OPTS ${SSH_USER}@${SSH_MACHINE} \"sudo grep 'USER_LOGIN.*acct=\\\"root\\\".*terminal=ssh.*res=failed' /var/log/audit/audit.log\"" \
            0 "audit.log contains entry about unsuccessful root login"
        # We modify the default sshd settings on live ISO, so we can only check the default empty password setting
        # outside of live ISO
        rlRun -t -c "ssh $SSH_OPTS ${SSH_USER}@${SSH_MACHINE} 'sudo grep -E \"^[[:blank:]]*PermitEmptyPasswords[[:blank:]]*yes\" /etc/ssh/sshd_config'" 1 \
            "Login with empty passwords is disabled in sshd config file"
    fi
    rlRun -t -c "ssh $SSH_OPTS ${SSH_USER}@${SSH_MACHINE} 'cat /etc/redhat-release'"
}

# verify that a kernel command line argument was passed from the blueprint (this is added to the blueprint in ../test_cli.sh)
check_kernel_cmdline() {
    rlRun -t -c "ssh $SSH_OPTS ${SSH_USER}@${SSH_MACHINE} 'grep custom_cmdline_arg /proc/cmdline'" 0 \
        "System booted from the image contains specified parameter on kernel command line"
}