Messages in this thread | | | Subject | Re: [PATCH 2/5] keys: generate self-signed module signing key using CSR | From | Nayna <> | Date | Thu, 18 Feb 2021 17:02:53 -0500 |
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On 2/11/21 5:01 PM, Stefan Berger wrote: > On 2/11/21 2:54 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. >> >> 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 > > > Could you not just rename signing_key.key to signing_key.pem (as it > was before) and that would be it? Why do you need the .crt in that pem > bundle?
I had also thought so, but the PEM file contains both the private key and the certificate. I found the reasoning in the commit "fb1179499134 modsign: Use single PEM file for autogenerated key". I addressed your other feedback in v2, posted just now.
Thanks & Regards,
- Nayna
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