| Message ID | 20210218220011.67625-3-nayna@linux.ibm.com (mailing list archive) |
|---|---|
| State | New |
| Headers | show |
| Series | ima: kernel build support for loading the kernel module signing key | expand |
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@linux.ibm.com> Tested this also as part of a patch I am going to post. Reviewed-by: Stefan Berger <stefanb@linux.ibm.com> > --- > 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) "###"
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) "###"
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@linux.ibm.com> --- Makefile | 3 ++- certs/Makefile | 15 +++++++++++---- 2 files changed, 13 insertions(+), 5 deletions(-)