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SubjectRe: [PATCH 2/5] keys: generate self-signed module signing key using CSR
On Thu, Feb 11, 2021 at 02:54:32PM -0500, 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.
>
> This patch generates a self-signed module signing key using CSR.

"Generate ..."

/Jarkko

>
> 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
>
>

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