kernel-modsign.bbclass: add support for kernel modules signing

Add bbclass responsible for handling signing of kernel modules.

Signed-off-by: Dmitry Eremin-Solenikov <dmitry_eremin-solenikov@mentor.com>

fixup class to avoid including in every configure task

Signed-off-by: Armin Kuster <akuster808@gmail.com>

3 files changed, 79 insertions, 0 deletions

diff --git a/meta-integrity/classes/kernel-modsign.bbclass b/meta-integrity/classes/kernel-modsign.bbclass
new file mode 100644
index 0000000..09025ba
--- /dev/null
+++ b/meta-integrity/classes/kernel-modsign.bbclass
@@ -0,0 +1,29 @@
+# No default! Either this or MODSIGN_PRIVKEY/MODSIGN_X509 have to be
+# set explicitly in a local.conf before activating kernel-modsign.
+# To use the insecure (because public) example keys, use
+# MODSIGN_KEY_DIR = "${INTEGRITY_BASE}/data/debug-keys"
+MODSIGN_KEY_DIR ?= "MODSIGN_KEY_DIR_NOT_SET"
+
+# Private key for modules signing. The default is okay when
+# using the example key directory.
+MODSIGN_PRIVKEY ?= "${MODSIGN_KEY_DIR}/privkey_modsign.pem"
+
+# Public part of certificates used for modules signing.
+# The default is okay when using the example key directory.
+MODSIGN_X509 ?= "${MODSIGN_KEY_DIR}/x509_modsign.crt"
+
+# If this class is enabled, disable stripping signatures from modules
+INHIBIT_PACKAGE_STRIP = "1"
+
+kernel_do_configure_prepend() {
+    if [ -f "${MODSIGN_PRIVKEY}" -a -f "${MODSIGN_X509}" ]; then
+        cat "${MODSIGN_PRIVKEY}" "${MODSIGN_X509}" \
+            > "${B}/modsign_key.pem"
+    else
+        bberror "Either modsign key or certificate are invalid"
+    fi
+}
+
+do_shared_workdir_append() {
+    cp modsign_key.pem $kerneldir/
+}
diff --git a/meta-integrity/data/debug-keys/privkey_modsign.pem b/meta-integrity/data/debug-keys/privkey_modsign.pem
new file mode 100644
index 0000000..4cac00a
--- /dev/null
+++ b/meta-integrity/data/debug-keys/privkey_modsign.pem
@@ -0,0 +1,28 @@
+-----BEGIN PRIVATE KEY-----
+MIIEvQIBADANBgkqhkiG9w0BAQEFAASCBKcwggSjAgEAAoIBAQDEWsJjB2pA5Ih6
+EelXvVjwWY1ix1azMciNRNPPQN1AMXF0K/VUkfOYbaPajg1cQYEf9gk3q7OZ5Axk
+UY/e5piZORaPcsmj0lV0L+NSlRYydR5M/QxtEz26585FgqRGdAe6umStPmVKdqa2
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+EI1IAq5RbWXq0f70W/U49U3HB74GPwg6d/uFreDRAoGAN+v9gMQA6A1vM7LvbYR8
+5CwwyqS/CfI9zKPLn53QstguXC/ObafIYQzVRqGb9lCQgtlmmKw4jMY0B/lDzpcH
+zS8rqoyvDj/m7i17NYkqXErJKLRQ0ptXKdLXHlG0u185e7Y5p4O3Z5dk8bACkpHi
+hp764y+BtU4qIcVaPsPK4uU=
+-----END PRIVATE KEY-----
diff --git a/meta-integrity/data/debug-keys/x509_modsign.crt b/meta-integrity/data/debug-keys/x509_modsign.crt
new file mode 100644
index 0000000..5fa2a90
--- /dev/null
+++ b/meta-integrity/data/debug-keys/x509_modsign.crt
@@ -0,0 +1,22 @@
+-----BEGIN CERTIFICATE-----
+MIIDnjCCAoagAwIBAgIUUqmBj5Q8edHMMTXsoGVGEEKdwV4wDQYJKoZIhvcNAQEL
+BQAwZzEqMCgGA1UEAxMhbWV0YS1zZWN1cml0eSBtb2R1bGVzIHNpZ25pbmcga2V5
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+EztTO8Q+yhZujZbmEyJmxqZv
+-----END CERTIFICATE-----