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ima: enable signing of modules with build time generated key

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The kernel build process currently only signs kernel modules when
MODULE_SIG is enabled. Also, sign the kernel modules at build time when
IMA_APPRAISE_MODSIG is enabled.

Signed-off-by: Nayna Jain <nayna@linux.ibm.com>
Acked-by: Stefan Berger <stefanb@linux.ibm.com>
Signed-off-by: Mimi Zohar <zohar@linux.ibm.com>
This commit is contained in:
Nayna Jain 2021-04-09 10:35:06 -04:00 committed by Mimi Zohar
parent b31f2a495d
commit 0165f4ca22
3 changed files with 12 additions and 4 deletions
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2
certs/Kconfig
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@ -4,7 +4,7 @@ menu "Certificates for signature checking"
config MODULE_SIG_KEY
string "File name or PKCS#11 URI of module signing key"
default "certs/signing_key.pem"
depends on MODULE_SIG
depends on MODULE_SIG || IMA_APPRAISE_MODSIG
help
Provide the file name of a private key/certificate in PEM format,
or a PKCS#11 URI according to RFC7512. The file should contain, or

8
certs/Makefile
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@ -32,6 +32,14 @@ endif # CONFIG_SYSTEM_TRUSTED_KEYRING
clean-files := x509_certificate_list .x509.list
ifeq ($(CONFIG_MODULE_SIG),y)
SIGN_KEY = y
endif
ifeq ($(CONFIG_IMA_APPRAISE_MODSIG),y)
SIGN_KEY = y
endif
ifdef SIGN_KEY
###############################################################################
#
# If module signing is requested, say by allyesconfig, but a key has not been

6
init/Kconfig
View File

@ -2164,7 +2164,7 @@ config MODULE_SIG_FORCE
config MODULE_SIG_ALL
bool "Automatically sign all modules"
default y
depends on MODULE_SIG
depends on MODULE_SIG || IMA_APPRAISE_MODSIG
help
Sign all modules during make modules_install. Without this option,
modules must be signed manually, using the scripts/sign-file tool.
@ -2174,7 +2174,7 @@ comment "Do not forget to sign required modules with scripts/sign-file"
choice
prompt "Which hash algorithm should modules be signed with?"
depends on MODULE_SIG
depends on MODULE_SIG || IMA_APPRAISE_MODSIG
help
This determines which sort of hashing algorithm will be used during
signature generation. This algorithm _must_ be built into the kernel
@ -2206,7 +2206,7 @@ endchoice
config MODULE_SIG_HASH
string
depends on MODULE_SIG
depends on MODULE_SIG || IMA_APPRAISE_MODSIG
default "sha1" if MODULE_SIG_SHA1
default "sha224" if MODULE_SIG_SHA224
default "sha256" if MODULE_SIG_SHA256