On 2/18/21 5:00 PM, Nayna Jain wrote:
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.
Generate a self-signed module signing key using CSR.
Signed-off-by: Nayna Jain <nayna@xxxxxxxxxxxxx>
Tested this also as part of a patch I am going to post.
Reviewed-by: Stefan Berger <stefanb@xxxxxxxxxxxxx>
---
Makefile | 3 ++-
certs/Makefile | 15 +++++++++++----
2 files changed, 13 insertions(+), 5 deletions(-)
diff --git a/Makefile b/Makefile
index 004163a4e6b3..a971d4ae40bd 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) "###"
