113 lines
3.7 KiB
Diff
113 lines
3.7 KiB
Diff
From 6aca93c96e067deab170188aea3edb0afd88e9a2 Mon Sep 17 00:00:00 2001
|
|
From: Josh Boyer <jwboyer@fedoraproject.org>
|
|
Date: Fri, 26 Oct 2012 12:36:24 -0400
|
|
Subject: [PATCH] KEYS: Add a system blacklist keyring
|
|
|
|
This adds an additional keyring that is used to store certificates that
|
|
are blacklisted. This keyring is searched first when loading signed modules
|
|
and if the module's certificate is found, it will refuse to load. This is
|
|
useful in cases where third party certificates are used for module signing.
|
|
|
|
Signed-off-by: Josh Boyer <jwboyer@fedoraproject.org>
|
|
---
|
|
include/keys/system_keyring.h | 4 ++++
|
|
init/Kconfig | 9 +++++++++
|
|
kernel/module_signing.c | 12 ++++++++++++
|
|
kernel/system_keyring.c | 17 +++++++++++++++++
|
|
4 files changed, 42 insertions(+)
|
|
|
|
diff --git a/include/keys/system_keyring.h b/include/keys/system_keyring.h
|
|
index 72665eb80692..2c7b80d31366 100644
|
|
--- a/include/keys/system_keyring.h
|
|
+++ b/include/keys/system_keyring.h
|
|
@@ -28,4 +28,8 @@ static inline struct key *get_system_trusted_keyring(void)
|
|
}
|
|
#endif
|
|
|
|
+#ifdef CONFIG_SYSTEM_BLACKLIST_KEYRING
|
|
+extern struct key *system_blacklist_keyring;
|
|
+#endif
|
|
+
|
|
#endif /* _KEYS_SYSTEM_KEYRING_H */
|
|
diff --git a/init/Kconfig b/init/Kconfig
|
|
index e84c6423a2e5..223b1a32bbcb 100644
|
|
--- a/init/Kconfig
|
|
+++ b/init/Kconfig
|
|
@@ -1720,6 +1720,15 @@ config SYSTEM_TRUSTED_KEYRING
|
|
|
|
Keys in this keyring are used by module signature checking.
|
|
|
|
+config SYSTEM_BLACKLIST_KEYRING
|
|
+ bool "Provide system-wide ring of blacklisted keys"
|
|
+ depends on KEYS
|
|
+ help
|
|
+ Provide a system keyring to which blacklisted keys can be added.
|
|
+ Keys in the keyring are considered entirely untrusted. Keys in this
|
|
+ keyring are used by the module signature checking to reject loading
|
|
+ of modules signed with a blacklisted key.
|
|
+
|
|
config PROFILING
|
|
bool "Profiling support"
|
|
help
|
|
diff --git a/kernel/module_signing.c b/kernel/module_signing.c
|
|
index be5b8fac4bd0..fed815fcdaf2 100644
|
|
--- a/kernel/module_signing.c
|
|
+++ b/kernel/module_signing.c
|
|
@@ -158,6 +158,18 @@ static struct key *request_asymmetric_key(const char *signer, size_t signer_len,
|
|
|
|
pr_debug("Look up: \"%s\"\n", id);
|
|
|
|
+#ifdef CONFIG_SYSTEM_BLACKLIST_KEYRING
|
|
+ key = keyring_search(make_key_ref(system_blacklist_keyring, 1),
|
|
+ &key_type_asymmetric, id);
|
|
+ if (!IS_ERR(key)) {
|
|
+ /* module is signed with a cert in the blacklist. reject */
|
|
+ pr_err("Module key '%s' is in blacklist\n", id);
|
|
+ key_ref_put(key);
|
|
+ kfree(id);
|
|
+ return ERR_PTR(-EKEYREJECTED);
|
|
+ }
|
|
+#endif
|
|
+
|
|
key = keyring_search(make_key_ref(system_trusted_keyring, 1),
|
|
&key_type_asymmetric, id);
|
|
if (IS_ERR(key))
|
|
diff --git a/kernel/system_keyring.c b/kernel/system_keyring.c
|
|
index 875f64e8935b..c15e93f5a418 100644
|
|
--- a/kernel/system_keyring.c
|
|
+++ b/kernel/system_keyring.c
|
|
@@ -20,6 +20,9 @@
|
|
|
|
struct key *system_trusted_keyring;
|
|
EXPORT_SYMBOL_GPL(system_trusted_keyring);
|
|
+#ifdef CONFIG_SYSTEM_BLACKLIST_KEYRING
|
|
+struct key *system_blacklist_keyring;
|
|
+#endif
|
|
|
|
extern __initconst const u8 system_certificate_list[];
|
|
extern __initconst const unsigned long system_certificate_list_size;
|
|
@@ -41,6 +44,20 @@ static __init int system_trusted_keyring_init(void)
|
|
panic("Can't allocate system trusted keyring\n");
|
|
|
|
set_bit(KEY_FLAG_TRUSTED_ONLY, &system_trusted_keyring->flags);
|
|
+
|
|
+#ifdef CONFIG_SYSTEM_BLACKLIST_KEYRING
|
|
+ system_blacklist_keyring = keyring_alloc(".system_blacklist_keyring",
|
|
+ KUIDT_INIT(0), KGIDT_INIT(0),
|
|
+ current_cred(),
|
|
+ (KEY_POS_ALL & ~KEY_POS_SETATTR) |
|
|
+ KEY_USR_VIEW | KEY_USR_READ,
|
|
+ KEY_ALLOC_NOT_IN_QUOTA, NULL);
|
|
+ if (IS_ERR(system_blacklist_keyring))
|
|
+ panic("Can't allocate system blacklist keyring\n");
|
|
+
|
|
+ set_bit(KEY_FLAG_TRUSTED_ONLY, &system_blacklist_keyring->flags);
|
|
+#endif
|
|
+
|
|
return 0;
|
|
}
|
|
|
|
--
|
|
1.9.3
|
|
|