[PATCH 2/5] keys: generate self-signed module signing key using CSR
From: Nayna Jain <nayna@linux.ibm.com>
Date: 2021-02-11 19:58:51
Also in:
keyrings, linux-integrity, lkml
Subsystem:
certificate handling, kernel build + files below scripts/ (unless maintained elsewhere), the rest · Maintainers:
David Howells, David Woodhouse, Nathan Chancellor, Nicolas Schier, Linus Torvalds
Loading a key on the IMA trusted keyring requires the key be signed by an existing key on the builtin or secondary trusted keyring. Creating a Certificate Signing Request (CSR) allows the certificate to be self-signed or signed by a CA. This patch generates a self-signed module signing key using CSR. Signed-off-by: Nayna Jain <nayna@linux.ibm.com> --- Makefile | 3 ++- certs/Makefile | 15 +++++++++++---- 2 files changed, 13 insertions(+), 5 deletions(-)
diff --git a/Makefile b/Makefile
index af18aab6bbee..9c87fdd600d8 100644
--- a/Makefile
+++ b/Makefile@@ -1473,7 +1473,8 @@ MRPROPER_FILES += include/config include/generated \ .config .config.old .version \ Module.symvers \ certs/signing_key.pem certs/signing_key.x509 \ - certs/x509.genkey \ + certs/x509.genkey certs/signing_key.key \ + certs/signing_key.crt certs/signing_key.csr \ vmlinux-gdb.py \ *.spec
diff --git a/certs/Makefile b/certs/Makefile
index f4c25b67aad9..b2be7eb413d3 100644
--- a/certs/Makefile
+++ b/certs/Makefile@@ -60,11 +60,18 @@ $(obj)/signing_key.pem: $(obj)/x509.genkey @$(kecho) "### needs to be run as root, and uses a hardware random" @$(kecho) "### number generator if one is available." @$(kecho) "###" - $(Q)openssl req -new -nodes -utf8 -$(CONFIG_MODULE_SIG_HASH) -days 36500 \ - -batch -x509 -config $(obj)/x509.genkey \ - -outform PEM -out $(obj)/signing_key.pem \ - -keyout $(obj)/signing_key.pem \ + $(Q)openssl req -new -nodes -utf8 \ + -batch -config $(obj)/x509.genkey \ + -outform PEM -out $(obj)/signing_key.csr \ + -keyout $(obj)/signing_key.key -extensions myexts \ $($(quiet)redirect_openssl) + $(Q)openssl x509 -req -days 36500 -in $(obj)/signing_key.csr \ + -outform PEM -out $(obj)/signing_key.crt \ + -signkey $(obj)/signing_key.key \ + -$(CONFIG_MODULE_SIG_HASH) -extensions myexts \ + -extfile $(obj)/x509.genkey \ + $($(quiet)redirect_openssl) + @cat $(obj)/signing_key.key $(obj)/signing_key.crt >> $(obj)/signing_key.pem @$(kecho) "###" @$(kecho) "### Key pair generated." @$(kecho) "###"
--
2.18.1