From 9b90717e9102a31dd8b99b16d62cd644091fd57e Mon Sep 17 00:00:00 2001 From: Ricardo Neri Date: Mon, 5 Aug 2019 18:18:23 -0400 Subject: runqemu: Add support to handle EnrollDefaultKeys PK/KEK1 certificate The EnrollDefaultKeys.efi application (distributed in ovmf-shell-image) expects the hypervisor to provide a Platform Key and first Key Exchange Key certificate. For QEMU, this is done by adding an OEM string in the Type 11 SMBIOS table. The string contains the EnrollDefaultKeys application GUID followed by the certificate string. For now, the string is passed in the command line until QEMU understands OEM strings from regular files (please see https://bugs.launchpad.net/qemu/+bug/1826200). If runqemu detects it is given an OVMF binary with support for Secure Boot (i.e., ovmf.secboot* binaries), extract the certificate string from the OvmfPkKek1.pem certificate and modify the command-line parameters to provide the key. Such certificate is created when building OVMF with support for Secure Boot. Cc: Ross Burton Cc: Patrick Ohly (From OE-Core rev: 5e47316ae62f7632fb62bc3b8093ac42f9e3541c) Signed-off-by: Ricardo Neri Signed-off-by: Richard Purdie --- scripts/runqemu | 32 ++++++++++++++++++++++++++++++++ 1 file changed, 32 insertions(+) (limited to 'scripts') diff --git a/scripts/runqemu b/scripts/runqemu index 9d6a2e86d4..df3c8aad08 100755 --- a/scripts/runqemu +++ b/scripts/runqemu @@ -148,6 +148,10 @@ class BaseConfig(object): # Setting one also adds "-vga std" because that is all that # OVMF supports. self.ovmf_bios = [] + # When enrolling default Secure Boot keys, the hypervisor + # must provide the Platform Key and the first Key Exchange Key + # certificate in the Type 11 SMBIOS table. + self.ovmf_secboot_pkkek1 = '' self.qemuboot = '' self.qbconfload = False self.kernel = '' @@ -638,6 +642,23 @@ class BaseConfig(object): if not os.path.exists(self.rootfs): raise RunQemuError("Can't find rootfs: %s" % self.rootfs) + def setup_pkkek1(self): + """ + Extract from PEM certificate the Platform Key and first Key + Exchange Key certificate string. The hypervisor needs to provide + it in the Type 11 SMBIOS table + """ + pemcert = '%s/%s' % (self.get('DEPLOY_DIR_IMAGE'), 'OvmfPkKek1.pem') + try: + with open(pemcert, 'r') as pemfile: + key = pemfile.read().replace('\n', ''). \ + replace('-----BEGIN CERTIFICATE-----', ''). \ + replace('-----END CERTIFICATE-----', '') + self.ovmf_secboot_pkkek1 = key + + except FileNotFoundError: + raise RunQemuError("Can't open PEM certificate %s " % pemcert) + def check_ovmf(self): """Check and set full path for OVMF firmware and variable file(s).""" @@ -648,6 +669,8 @@ class BaseConfig(object): path = '%s/%s.%s' % (self.get('DEPLOY_DIR_IMAGE'), ovmf, suffix) if os.path.exists(path): self.ovmf_bios[index] = path + if ovmf.endswith('secboot'): + self.setup_pkkek1() break else: raise RunQemuError("Can't find OVMF firmware: %s" % ovmf) @@ -914,6 +937,8 @@ class BaseConfig(object): print('ROOTFS: [%s]' % self.rootfs) if self.ovmf_bios: print('OVMF: %s' % self.ovmf_bios) + if (self.ovmf_secboot_pkkek1): + print('SECBOOT PKKEK1: [%s...]' % self.ovmf_secboot_pkkek1[0:100]) print('CONFFILE: [%s]' % self.qemuboot) print('') @@ -1262,6 +1287,13 @@ class BaseConfig(object): self.qemu_opt += ' ' + self.qemu_opt_script + if self.ovmf_secboot_pkkek1: + # Provide the Platform Key and first Key Exchange Key certificate as an + # OEM string in the SMBIOS Type 11 table. Prepend the certificate string + # with "application prefix" of the EnrollDefaultKeys.efi application + self.qemu_opt += ' -smbios type=11,value=4e32566d-8e9e-4f52-81d3-5bb9715f9727:' \ + + self.ovmf_secboot_pkkek1 + # Append qemuparams to override previous settings if self.qemuparams: self.qemu_opt += ' ' + self.qemuparams -- cgit v1.2.3-54-g00ecf