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Add Secure Boot support for arbitrary Client OS
Affects "Grub2 UEFI" PXE loaders * PR in foreman: theforeman/foreman#9864 * PR in smart-proxy: theforeman/smart-proxy#877 * RFC: https://community.theforeman.org/t/add-secureboot-support-for-arbitrary-distributions/32601/1
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...odules/proc_configuring-smart-proxy-to-provision-secure-boot-enabled-hosts.adoc
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| [id="configuring-{smart-proxy-context}-to-provision-{client-os-context}-on-Secure-Boot-enabled-hosts"] | ||
| = Configuring {SmartProxy} to provision {client-os} on Secure Boot enabled hosts | ||
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| Secure Boot follows a chain of trust from the start of the host to the loading of Linux kernel modules. | ||
| The first shim that is loaded determines which distribution can be booted or loaded by using a `kexec` system call until the next reboot. | ||
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| To provision {client-os} on Secure Boot enabled hosts with the *Grub2 UEFI SecureBoot* and *Grub2 UEFI HTTPS SecureBoot* PXE loaders, you have to provide signed shim and GRUB2 binaries provided by the vendor of your operating system. | ||
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| [IMPORTANT] | ||
| ==== | ||
| You have to perform the following configuration steps on each TFTP {SmartProxy} for a subnet to provision Secure Boot enabled hosts on that subnet. | ||
| ==== | ||
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| The following example works for {client-os} on x86_64 architecture. | ||
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| .Prerequisites | ||
| ifeval::["{client-os}" == "Debian"] | ||
| * Ensure that the `binutils` and `xz-utils` packages are installed on your {SmartProxy}. | ||
| endif::[] | ||
| ifeval::["{client-os}" == "Ubuntu"] | ||
| * Ensure that the `binutils`, `xz-utils`, and `zstd` packages are installed on your {SmartProxy}. | ||
| endif::[] | ||
| ifeval::["{client-pkg-ext}" == "rpm"] | ||
| * Ensure that the `cpio` package is installed on your {SmartProxy}. | ||
| endif::[] | ||
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| .Procedure | ||
| . Set the path for the shim and GRUB2 binaries for the operating system of your host: | ||
| + | ||
| [options="nowrap" subs="+quotes,verbatim,attributes"] | ||
| ---- | ||
| # BOOTLOADER_PATH="/var/lib/tftpboot/bootloader-universe/pxegrub2/_{secureboot-os-name}_/default/x86_64" | ||
| ---- | ||
| + | ||
| If you require specific versions of the shim and GRUB2 binaries for the version of the operating system of your host, replace `default` with the *Major* and *Minor* version of the operating system separated by a dot. | ||
| If no *Minor* version is set, replace `default` with the *Major* version. | ||
| + | ||
| {Team} recommends to not use version-specific shim and GRUB2 binaries unless it is really necessary. | ||
| . Create the directory to store the shim and GRUB2 binaries for the operating system of your host: | ||
| + | ||
| [options="nowrap" subs="+quotes,verbatim,attributes"] | ||
| ---- | ||
| # install -o foreman-proxy -g foreman-proxy -d $BOOTLOADER_PATH | ||
| ---- | ||
| . Download the shim and GRUB2 packages for the operating system of your host: | ||
| + | ||
| [options="nowrap" subs="+quotes,verbatim,attributes"] | ||
| ---- | ||
| # wget -O /tmp/{grub_efi_downloaded_package_name} _https://{server-example-com}/{grub_efi_downloaded_package_name}_ | ||
| # wget -O /tmp/{shim_efi_downloaded_package_name} _https://{server-example-com}/{shim_efi_downloaded_package_name}_ | ||
| ---- | ||
| + | ||
| You can download the `{grub_efi_package_name}` package from {grub_efi_download_url}. | ||
| You can download the `{shim_efi_package_name}` package from {shim_efi_download_url}. | ||
| . Extract the shim and GRUB2 binaries: | ||
| + | ||
| [options="nowrap" subs="+quotes,verbatim,attributes"] | ||
| ---- | ||
| # {extract_grub} | ||
| # {extract_shim} | ||
| ---- | ||
| . Make the shim and GRUB2 binaries available for host provisioning: | ||
| + | ||
| [options="nowrap" subs="+quotes,verbatim,attributes"] | ||
| ---- | ||
| # cp {grub_efi_tmp_binary_path} $BOOTLOADER_PATH/grubx64.efi | ||
| # cp {shim_efi_tmp_binary_path} $BOOTLOADER_PATH/shimx64.efi | ||
| # ln -sr $BOOTLOADER_PATH/grubx64.efi $BOOTLOADER_PATH/boot.efi | ||
| # ln -sr $BOOTLOADER_PATH/shimx64.efi $BOOTLOADER_PATH/boot-sb.efi | ||
| # chmod 644 $BOOTLOADER_PATH/grubx64.efi | ||
| # chmod 644 $BOOTLOADER_PATH/shimx64.efi | ||
| ---- | ||
| ifeval::["{client-pkg-ext}" == "deb"] | ||
| . Link the `grub.cfg` file from the TFTP servers `grub2` folder to the legacy `grub` folder: | ||
| + | ||
| [options="nowrap" subs="+quotes,verbatim,attributes"] | ||
| ---- | ||
| # ln --relative --symbolic /var/lib/tftpboot/grub2/grub.cfg /var/lib/tftpboot/grub/grub.cfg | ||
| ---- | ||
| endif::[] | ||
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| .Verification | ||
| * Verify the contents of your boot loader directory: | ||
| + | ||
| [source, none, options="nowrap" subs="+quotes,verbatim,attributes"] | ||
| ---- | ||
| # tree /var/lib/tftpboot/bootloader-universe | ||
| /var/lib/tftpboot/bootloader-universe | ||
| └── pxegrub2 | ||
| └── _{secureboot-os-name}_ | ||
| └── default | ||
| └── x86_64 | ||
| ├── boot.efi -> grubx64.efi | ||
| ├── boot-sb.efi -> shimx64.efi | ||
| ├── grubx64.efi | ||
| └── shimx64.efi | ||
| ---- | ||
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| .Next steps | ||
| * You can now provision Secure Boot enabled {client-os} hosts by using the *Grub2 UEFI SecureBoot* and *Grub2 UEFI HTTPS SecureBoot* PXE loaders. |