diff mbox series

[v9,18/25] security: Introduce key_post_create_or_update hook

Message ID 20240115181809.885385-19-roberto.sassu@huaweicloud.com (mailing list archive)
State Accepted
Commit b8d997032a46fcf47d5bda011c0d1e87b20c08ba
Headers show
Series security: Move IMA and EVM to the LSM infrastructure | expand

Commit Message

Roberto Sassu Jan. 15, 2024, 6:18 p.m. UTC 
From: Roberto Sassu <roberto.sassu@huawei.com>

In preparation for moving IMA and EVM to the LSM infrastructure, introduce
the key_post_create_or_update hook.

Depending on policy, IMA measures the key content after creation or update,
so that remote verifiers are aware of the operation.

Other LSMs could similarly take some action after successful key creation
or update.

The new hook cannot return an error and cannot cause the operation to be
reverted.

Signed-off-by: Roberto Sassu <roberto.sassu@huawei.com>
Reviewed-by: Stefan Berger <stefanb@linux.ibm.com>
Acked-by: Casey Schaufler <casey@schaufler-ca.com>
Reviewed-by: Mimi Zohar <zohar@linux.ibm.com>
---
 include/linux/lsm_hook_defs.h |  3 +++
 include/linux/security.h      | 11 +++++++++++
 security/keys/key.c           |  7 ++++++-
 security/security.c           | 19 +++++++++++++++++++
 4 files changed, 39 insertions(+), 1 deletion(-)

Comments

Paul Moore Feb. 8, 2024, 3:18 a.m. UTC | #1 
On Jan 15, 2024 Roberto Sassu <roberto.sassu@huaweicloud.com> wrote:
> 
> In preparation for moving IMA and EVM to the LSM infrastructure, introduce
> the key_post_create_or_update hook.
> 
> Depending on policy, IMA measures the key content after creation or update,
> so that remote verifiers are aware of the operation.
> 
> Other LSMs could similarly take some action after successful key creation
> or update.
> 
> The new hook cannot return an error and cannot cause the operation to be
> reverted.
> 
> Signed-off-by: Roberto Sassu <roberto.sassu@huawei.com>
> Reviewed-by: Stefan Berger <stefanb@linux.ibm.com>
> Acked-by: Casey Schaufler <casey@schaufler-ca.com>
> Reviewed-by: Mimi Zohar <zohar@linux.ibm.com>
> ---
>  include/linux/lsm_hook_defs.h |  3 +++
>  include/linux/security.h      | 11 +++++++++++
>  security/keys/key.c           |  7 ++++++-
>  security/security.c           | 19 +++++++++++++++++++
>  4 files changed, 39 insertions(+), 1 deletion(-)

Acked-by: Paul Moore <paul@paul-moore.com>

--
paul-moore.com
diff mbox series

Patch

diff --git a/include/linux/lsm_hook_defs.h b/include/linux/lsm_hook_defs.h
index 47dc633090a4..f8c4ec008263 100644
--- a/include/linux/lsm_hook_defs.h
+++ b/include/linux/lsm_hook_defs.h
@@ -405,6 +405,9 @@  LSM_HOOK(void, LSM_RET_VOID, key_free, struct key *key)
 LSM_HOOK(int, 0, key_permission, key_ref_t key_ref, const struct cred *cred,
 	 enum key_need_perm need_perm)
 LSM_HOOK(int, 0, key_getsecurity, struct key *key, char **buffer)
+LSM_HOOK(void, LSM_RET_VOID, key_post_create_or_update, struct key *keyring,
+	 struct key *key, const void *payload, size_t payload_len,
+	 unsigned long flags, bool create)
 #endif /* CONFIG_KEYS */
 
 #ifdef CONFIG_AUDIT
diff --git a/include/linux/security.h b/include/linux/security.h
index 4b03c76b91f1..8436f9abf43d 100644
--- a/include/linux/security.h
+++ b/include/linux/security.h
@@ -2004,6 +2004,9 @@  void security_key_free(struct key *key);
 int security_key_permission(key_ref_t key_ref, const struct cred *cred,
 			    enum key_need_perm need_perm);
 int security_key_getsecurity(struct key *key, char **_buffer);
+void security_key_post_create_or_update(struct key *keyring, struct key *key,
+					const void *payload, size_t payload_len,
+					unsigned long flags, bool create);
 
 #else
 
@@ -2031,6 +2034,14 @@  static inline int security_key_getsecurity(struct key *key, char **_buffer)
 	return 0;
 }
 
+static inline void security_key_post_create_or_update(struct key *keyring,
+						      struct key *key,
+						      const void *payload,
+						      size_t payload_len,
+						      unsigned long flags,
+						      bool create)
+{ }
+
 #endif
 #endif /* CONFIG_KEYS */
 
diff --git a/security/keys/key.c b/security/keys/key.c
index 0260a1902922..f75fe66c2f03 100644
--- a/security/keys/key.c
+++ b/security/keys/key.c
@@ -935,6 +935,8 @@  static key_ref_t __key_create_or_update(key_ref_t keyring_ref,
 		goto error_link_end;
 	}
 
+	security_key_post_create_or_update(keyring, key, payload, plen, flags,
+					   true);
 	ima_post_key_create_or_update(keyring, key, payload, plen,
 				      flags, true);
 
@@ -968,10 +970,13 @@  static key_ref_t __key_create_or_update(key_ref_t keyring_ref,
 
 	key_ref = __key_update(key_ref, &prep);
 
-	if (!IS_ERR(key_ref))
+	if (!IS_ERR(key_ref)) {
+		security_key_post_create_or_update(keyring, key, payload, plen,
+						   flags, false);
 		ima_post_key_create_or_update(keyring, key,
 					      payload, plen,
 					      flags, false);
+	}
 
 	goto error_free_prep;
 }
diff --git a/security/security.c b/security/security.c
index 617acfaa44d1..d2a1226e6e69 100644
--- a/security/security.c
+++ b/security/security.c
@@ -5424,6 +5424,25 @@  int security_key_getsecurity(struct key *key, char **buffer)
 	*buffer = NULL;
 	return call_int_hook(key_getsecurity, 0, key, buffer);
 }
+
+/**
+ * security_key_post_create_or_update() - Notification of key create or update
+ * @keyring: keyring to which the key is linked to
+ * @key: created or updated key
+ * @payload: data used to instantiate or update the key
+ * @payload_len: length of payload
+ * @flags: key flags
+ * @create: flag indicating whether the key was created or updated
+ *
+ * Notify the caller of a key creation or update.
+ */
+void security_key_post_create_or_update(struct key *keyring, struct key *key,
+					const void *payload, size_t payload_len,
+					unsigned long flags, bool create)
+{
+	call_void_hook(key_post_create_or_update, keyring, key, payload,
+		       payload_len, flags, create);
+}
 #endif	/* CONFIG_KEYS */
 
 #ifdef CONFIG_AUDIT