KEYS: Add a new function request_valid_key_with_auxdata()
which does as request_key_with_auxdata() except that invalidated, revoked and
expired keys are ignored during the search for the requested key.
Signed-off-by: Carl Hetherington <cth@xxxxxxxxx>
---
include/linux/key.h | 6 +++++
security/keys/internal.h | 3 ++-
security/keys/keyctl.c | 2 +-
security/keys/request_key.c | 59 ++++++++++++++++++++++++++++++++++++++-------
4 files changed, 59 insertions(+), 11 deletions(-)
diff --git a/include/linux/key.h b/include/linux/key.h
index 80d6774..6a4ef03 100644
--- a/include/linux/key.h
+++ b/include/linux/key.h
@@ -252,6 +252,12 @@ extern struct key *request_key_with_auxdata(struct key_type *type,
size_t callout_len,
void *aux);
+extern struct key *request_valid_key_with_auxdata(struct key_type *type,
+ const char *description,
+ const void *callout_info,
+ size_t callout_len,
+ void *aux);
+
extern struct key *request_key_async(struct key_type *type,
const char *description,
const void *callout_info,
diff --git a/security/keys/internal.h b/security/keys/internal.h
index 80b2aac..5c9bc62 100644
--- a/security/keys/internal.h
+++ b/security/keys/internal.h
@@ -150,7 +150,8 @@ extern struct key *request_key_and_link(struct key_type *type,
size_t callout_len,
void *aux,
struct key *dest_keyring,
- unsigned long flags);
+ unsigned long key_alloc_flags,
+ unsigned long keyring_search_flags);
extern int lookup_user_key_possessed(const struct key *key, const void *target);
extern key_ref_t lookup_user_key(key_serial_t id, unsigned long flags,
diff --git a/security/keys/keyctl.c b/security/keys/keyctl.c
index cee72ce..25a12bc 100644
--- a/security/keys/keyctl.c
+++ b/security/keys/keyctl.c
@@ -212,7 +212,7 @@ SYSCALL_DEFINE4(request_key, const char __user *, _type,
/* do the search */
key = request_key_and_link(ktype, description, callout_info,
callout_len, NULL, key_ref_to_ptr(dest_ref),
- KEY_ALLOC_IN_QUOTA);
+ KEY_ALLOC_IN_QUOTA, 0);
if (IS_ERR(key)) {
ret = PTR_ERR(key);
goto error5;
diff --git a/security/keys/request_key.c b/security/keys/request_key.c
index 3814119..9f78aed 100644
--- a/security/keys/request_key.c
+++ b/security/keys/request_key.c
@@ -500,7 +500,11 @@ couldnt_alloc_key:
* @callout_len: The length of callout_info.
* @aux: Auxiliary data for the upcall.
* @dest_keyring: Where to cache the key.
- * @flags: Flags to key_alloc().
+ * @key_alloc_flags: Flags to key_alloc().
+ * @keyring_search_flags: Flags to pass in the keyring search context
+ * (in addition to KEYRING_SEARCH_LOOKUP_DIRECT). For example, passing
+ * KEYRING_SEARCH_DO_STATE_CHECK here will stop the function returning
+ * invalidated, revoked or expired keys.
*
* A key matching the specified criteria is searched for in the process's
* keyrings and returned with its usage count incremented if found. Otherwise,
@@ -525,7 +529,8 @@ struct key *request_key_and_link(struct key_type *type,
size_t callout_len,
void *aux,
struct key *dest_keyring,
- unsigned long flags)
+ unsigned long key_alloc_flags,
+ unsigned long keyring_search_flags)
{
struct keyring_search_context ctx = {
.index_key.type = type,
@@ -533,7 +538,7 @@ struct key *request_key_and_link(struct key_type *type,
.cred = current_cred(),
.match = type->match,
.match_data = description,
- .flags = KEYRING_SEARCH_LOOKUP_DIRECT,
+ .flags = KEYRING_SEARCH_LOOKUP_DIRECT | keyring_search_flags,
};
struct key *key;
key_ref_t key_ref;
@@ -541,7 +546,7 @@ struct key *request_key_and_link(struct key_type *type,
kenter("%s,%s,%p,%zu,%p,%p,%lx",
ctx.index_key.type->name, ctx.index_key.description,
- callout_info, callout_len, aux, dest_keyring, flags);
+ callout_info, callout_len, aux, dest_keyring, key_alloc_flags);
/* search all the process keyrings for a key */
key_ref = search_process_keyrings(&ctx);
@@ -568,7 +573,7 @@ struct key *request_key_and_link(struct key_type *type,
goto error;
key = construct_key_and_link(&ctx, callout_info, callout_len,
- aux, dest_keyring, flags);
+ aux, dest_keyring, key_alloc_flags);
}
error:
@@ -629,7 +634,7 @@ struct key *request_key(struct key_type *type,
if (callout_info)
callout_len = strlen(callout_info);
key = request_key_and_link(type, description, callout_info, callout_len,
- NULL, NULL, KEY_ALLOC_IN_QUOTA);
+ NULL, NULL, KEY_ALLOC_IN_QUOTA, 0);
if (!IS_ERR(key)) {
ret = wait_for_key_construction(key, false);
if (ret < 0) {
@@ -665,7 +670,7 @@ struct key *request_key_with_auxdata(struct key_type *type,
int ret;
key = request_key_and_link(type, description, callout_info, callout_len,
- aux, NULL, KEY_ALLOC_IN_QUOTA);
+ aux, NULL, KEY_ALLOC_IN_QUOTA, 0);
if (!IS_ERR(key)) {
ret = wait_for_key_construction(key, false);
if (ret < 0) {
@@ -677,6 +682,42 @@ struct key *request_key_with_auxdata(struct key_type *type,
}
EXPORT_SYMBOL(request_key_with_auxdata);
+/**
+ * request_valid_key_with_auxdata - Request a key with auxiliary data for the upcaller
+ * @type: The type of key we want.
+ * @description: The searchable description of the key.
+ * @callout_info: The data to pass to the instantiation upcall (or NULL).
+ * @callout_len: The length of callout_info.
+ * @aux: Auxiliary data for the upcall.
+ *
+ * As for request_key_with_auxdata() except that existing invalidated, revoked and expired
+ * keys are ignored during the search for the requested key.
+ *
+ * Furthermore, it then works as wait_for_key_construction() to wait for the
+ * completion of keys undergoing construction with a non-interruptible wait.
+ */
+struct key *request_valid_key_with_auxdata(struct key_type *type,
+ const char *description,
+ const void *callout_info,
+ size_t callout_len,
+ void *aux)
+{
+ struct key *key;
+ int ret;
+
+ key = request_key_and_link(type, description, callout_info, callout_len,
+ aux, NULL, KEY_ALLOC_IN_QUOTA, KEYRING_SEARCH_DO_STATE_CHECK);
+ if (!IS_ERR(key)) {
+ ret = wait_for_key_construction(key, false);
+ if (ret < 0) {
+ key_put(key);
+ return ERR_PTR(ret);
+ }
+ }
+ return key;
+}
+EXPORT_SYMBOL(request_valid_key_with_auxdata);
+
/*
* request_key_async - Request a key (allow async construction)
* @type: Type of key.
@@ -698,7 +739,7 @@ struct key *request_key_async(struct key_type *type,
{
return request_key_and_link(type, description, callout_info,
callout_len, NULL, NULL,
- KEY_ALLOC_IN_QUOTA);
+ KEY_ALLOC_IN_QUOTA, 0);
}
EXPORT_SYMBOL(request_key_async);
@@ -723,6 +764,6 @@ struct key *request_key_async_with_auxdata(struct key_type *type,
void *aux)
{
return request_key_and_link(type, description, callout_info,
- callout_len, aux, NULL, KEY_ALLOC_IN_QUOTA);
+ callout_len, aux, NULL, KEY_ALLOC_IN_QUOTA, 0);
}
EXPORT_SYMBOL(request_key_async_with_auxdata);
--
1.9.1
--
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