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charset="utf-8" If the kernel is built with CONFIG_MODULE_SIG_KEY, get the subject key identifier and add an ACL for it within the .clavis keyring. Signed-off-by: Eric Snowberg --- certs/.gitignore | 1 + certs/Makefile | 20 ++++++++++++++++++++ certs/clavis_module_acl.c | 7 +++++++ security/clavis/clavis.h | 9 +++++++++ security/clavis/clavis_keyring.c | 27 +++++++++++++++++++++++++++ 5 files changed, 64 insertions(+) create mode 100644 certs/clavis_module_acl.c diff --git a/certs/.gitignore b/certs/.gitignore index cec5465f31c1..dc99ae5a2585 100644 --- a/certs/.gitignore +++ b/certs/.gitignore @@ -3,3 +3,4 @@ /extract-cert /x509_certificate_list /x509_revocation_list +/module_acl diff --git a/certs/Makefile b/certs/Makefile index f6fa4d8d75e0..f2555e5296f5 100644 --- a/certs/Makefile +++ b/certs/Makefile @@ -6,6 +6,7 @@ obj-$(CONFIG_SYSTEM_TRUSTED_KEYRING) +=3D system_keyring.o system_certific= ates.o obj-$(CONFIG_SYSTEM_BLACKLIST_KEYRING) +=3D blacklist.o blacklist_hashes.o obj-$(CONFIG_SYSTEM_REVOCATION_LIST) +=3D revocation_certificates.o +obj-$(CONFIG_SECURITY_CLAVIS) +=3D clavis_module_acl.o =20 $(obj)/blacklist_hashes.o: $(obj)/blacklist_hash_list CFLAGS_blacklist_hashes.o :=3D -I $(obj) @@ -75,6 +76,25 @@ $(obj)/signing_key.x509: $(filter-out $(PKCS11_URI),$(CO= NFIG_MODULE_SIG_KEY)) $( =20 targets +=3D signing_key.x509 =20 +ifeq ($(CONFIG_MODULE_SIG_KEY),) +quiet_cmd_make_module_acl =3D GEN $@ + cmd_make_module_acl =3D \ + echo > $@ +else +quiet_cmd_make_module_acl =3D GEN $@ + cmd_make_module_acl =3D \ + openssl x509 -in $< -inform der -ext subjectKeyIdentifier -nocert | \ + tail -n +2 | cut -f2 -d '=3D'| tr -d ':' | tr '[:upper:]' '[:lower:]' | \ + sed 's/^[ \t]*//; s/.*/"00:&",/' > $@ +endif + +$(obj)/module_acl: $(obj)/signing_key.x509 FORCE + $(call if_changed,make_module_acl) + +$(obj)/clavis_module_acl.o: $(obj)/module_acl + +targets +=3D module_acl + $(obj)/revocation_certificates.o: $(obj)/x509_revocation_list =20 $(obj)/x509_revocation_list: $(CONFIG_SYSTEM_REVOCATION_KEYS) $(obj)/extra= ct-cert FORCE diff --git a/certs/clavis_module_acl.c b/certs/clavis_module_acl.c new file mode 100644 index 000000000000..fc2f694c48f9 --- /dev/null +++ b/certs/clavis_module_acl.c @@ -0,0 +1,7 @@ +// SPDX-License-Identifier: GPL-2.0 +#include + +const char __initconst *const clavis_module_acl[] =3D { +#include "module_acl" + NULL +}; diff --git a/security/clavis/clavis.h b/security/clavis/clavis.h index 7b55a6050440..92f77a1939ad 100644 --- a/security/clavis/clavis.h +++ b/security/clavis/clavis.h @@ -11,4 +11,13 @@ struct asymmetric_setup_kid { struct asymmetric_key_id id; unsigned char data[CLAVIS_BIN_KID_MAX]; }; + +#ifndef CONFIG_SYSTEM_TRUSTED_KEYRING +const char __initconst *const clavis_module_acl[] =3D { + NULL +}; +#else +extern const char __initconst *const clavis_module_acl[]; +#endif + #endif /* _SECURITY_CLAVIS_H_ */ diff --git a/security/clavis/clavis_keyring.c b/security/clavis/clavis_keyr= ing.c index 00163e7f0fe9..2a18d0e77189 100644 --- a/security/clavis/clavis_keyring.c +++ b/security/clavis/clavis_keyring.c @@ -259,6 +259,31 @@ static struct key_restriction *clavis_restriction_allo= c(key_restrict_link_func_t return restriction; } =20 +static void clavis_add_acl(const char *const *skid_list, struct key *keyri= ng) +{ + const char *const *acl; + key_ref_t key; + + for (acl =3D skid_list; *acl; acl++) { + key =3D key_create(make_key_ref(keyring, true), + "clavis_key_acl", + *acl, + NULL, + 0, + KEY_POS_SEARCH | KEY_POS_VIEW | KEY_USR_SEARCH | KEY_USR_VIEW, + KEY_ALLOC_NOT_IN_QUOTA | KEY_ALLOC_BUILT_IN | + KEY_ALLOC_BYPASS_RESTRICTION); + if (IS_ERR(key)) { + if (PTR_ERR(key) =3D=3D -EEXIST) + pr_info("Duplicate clavis_key_acl %s\n", *acl); + else + pr_info("Problem with clavis_key_acl %s: %pe\n", *acl, key); + } else { + pr_info("Added clavis_key_acl %s\n", *acl); + } + } +} + static int __init clavis_keyring_init(void) { struct key_restriction *restriction; @@ -274,6 +299,8 @@ static int __init clavis_keyring_init(void) if (IS_ERR(clavis_keyring)) panic("Can't allocate clavis keyring\n"); =20 + clavis_add_acl(clavis_module_acl, clavis_keyring); + return 0; } =20 --=20 2.45.0