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keys: Pass the network namespace into request_key mechanism

Browse source 
Create a request_key_net() function and use it to pass the network
namespace domain tag into DNS revolver keys and rxrpc/AFS keys so that keys
for different domains can coexist in the same keyring.

Signed-off-by: David Howells <[email protected]>
cc: [email protected]
cc: [email protected]
cc: [email protected]
cc: [email protected]
This commit is contained in:
David Howells 2019-06-26 21:02:33 +01:00
commit a58946c158
16 changed files with 145 additions and 49 deletions
Download patch file Download diff file Expand all files Collapse all files

1
security/keys/internal.h
View file

@ -156,6 +156,7 @@ extern int install_session_keyring_to_cred(struct cred *, struct key *);
extern struct key *request_key_and_link(struct key_type *type,
const char *description,
struct key_tag *domain_tag,
const void *callout_info,
size_t callout_len,
void *aux,

2
security/keys/keyctl.c
View file

@ -224,7 +224,7 @@ SYSCALL_DEFINE4(request_key, const char __user *, _type,
}
/* do the search */
key = request_key_and_link(ktype, description, callout_info,
key = request_key_and_link(ktype, description, NULL, callout_info,
callout_len, NULL, key_ref_to_ptr(dest_ref),
KEY_ALLOC_IN_QUOTA);
if (IS_ERR(key)) {

11
security/keys/keyring.c
View file

@ -222,10 +222,13 @@ void key_set_index_key(struct keyring_index_key *index_key)
memcpy(index_key->desc, index_key->description, n);
if (index_key->type->flags & KEY_TYPE_NET_DOMAIN)
index_key->domain_tag = current->nsproxy->net_ns->key_domain;
else
index_key->domain_tag = &default_domain_tag;
if (!index_key->domain_tag) {
if (index_key->type->flags & KEY_TYPE_NET_DOMAIN)
index_key->domain_tag = current->nsproxy->net_ns->key_domain;
else
index_key->domain_tag = &default_domain_tag;
}
hash_key_type_and_desc(index_key);
}

39
security/keys/request_key.c
View file

@ -17,6 +17,7 @@
#include <linux/err.h>
#include <linux/keyctl.h>
#include <linux/slab.h>
#include <net/net_namespace.h>
#include "internal.h"
#include <keys/request_key_auth-type.h>
@ -533,16 +534,18 @@ error:
* request_key_and_link - Request a key and cache it in a keyring.
* @type: The type of key we want.
* @description: The searchable description of the key.
* @domain_tag: The domain in which the key operates.
* @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.
* @dest_keyring: Where to cache the key.
* @flags: Flags to key_alloc().
*
* A key matching the specified criteria is searched for in the process's
* keyrings and returned with its usage count incremented if found. Otherwise,
* if callout_info is not NULL, a key will be allocated and some service
* (probably in userspace) will be asked to instantiate it.
* A key matching the specified criteria (type, description, domain_tag) is
* searched for in the process's keyrings and returned with its usage count
* incremented if found. Otherwise, if callout_info is not NULL, a key will be
* allocated and some service (probably in userspace) will be asked to
* instantiate it.
*
* If successfully found or created, the key will be linked to the destination
* keyring if one is provided.
@ -558,6 +561,7 @@ error:
*/
struct key *request_key_and_link(struct key_type *type,
const char *description,
struct key_tag *domain_tag,
const void *callout_info,
size_t callout_len,
void *aux,
@ -566,6 +570,7 @@ struct key *request_key_and_link(struct key_type *type,
{
struct keyring_search_context ctx = {
.index_key.type = type,
.index_key.domain_tag = domain_tag,
.index_key.description = description,
.index_key.desc_len = strlen(description),
.cred = current_cred(),
@ -672,9 +677,10 @@ int wait_for_key_construction(struct key *key, bool intr)
EXPORT_SYMBOL(wait_for_key_construction);
/**
* request_key - Request a key and wait for construction
* request_key_tag - Request a key and wait for construction
* @type: Type of key.
* @description: The searchable description of the key.
* @domain_tag: The domain in which the key operates.
* @callout_info: The data to pass to the instantiation upcall (or NULL).
*
* As for request_key_and_link() except that it does not add the returned key
@ -685,9 +691,10 @@ EXPORT_SYMBOL(wait_for_key_construction);
* 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_key(struct key_type *type,
const char *description,
const char *callout_info)
struct key *request_key_tag(struct key_type *type,
const char *description,
struct key_tag *domain_tag,
const char *callout_info)
{
struct key *key;
size_t callout_len = 0;
@ -695,7 +702,8 @@ 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,
key = request_key_and_link(type, description, domain_tag,
callout_info, callout_len,
NULL, NULL, KEY_ALLOC_IN_QUOTA);
if (!IS_ERR(key)) {
ret = wait_for_key_construction(key, false);
@ -706,12 +714,13 @@ struct key *request_key(struct key_type *type,
}
return key;
}
EXPORT_SYMBOL(request_key);
EXPORT_SYMBOL(request_key_tag);
/**
* request_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.
* @domain_tag: The domain in which the key operates.
* @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.
@ -724,6 +733,7 @@ EXPORT_SYMBOL(request_key);
*/
struct key *request_key_with_auxdata(struct key_type *type,
const char *description,
struct key_tag *domain_tag,
const void *callout_info,
size_t callout_len,
void *aux)
@ -731,7 +741,8 @@ struct key *request_key_with_auxdata(struct key_type *type,
struct key *key;
int ret;
key = request_key_and_link(type, description, callout_info, callout_len,
key = request_key_and_link(type, description, domain_tag,
callout_info, callout_len,
aux, NULL, KEY_ALLOC_IN_QUOTA);
if (!IS_ERR(key)) {
ret = wait_for_key_construction(key, false);
@ -748,6 +759,7 @@ EXPORT_SYMBOL(request_key_with_auxdata);
* request_key_rcu - Request key from RCU-read-locked context
* @type: The type of key we want.
* @description: The name of the key we want.
* @domain_tag: The domain in which the key operates.
*
* Request a key from a context that we may not sleep in (such as RCU-mode
* pathwalk). Keys under construction are ignored.
@ -755,10 +767,13 @@ EXPORT_SYMBOL(request_key_with_auxdata);
* Return a pointer to the found key if successful, -ENOKEY if we couldn't find
* a key or some other error if the key found was unsuitable or inaccessible.
*/
struct key *request_key_rcu(struct key_type *type, const char *description)
struct key *request_key_rcu(struct key_type *type,
const char *description,
struct key_tag *domain_tag)
{
struct keyring_search_context ctx = {
.index_key.type = type,
.index_key.domain_tag = domain_tag,
.index_key.description = description,
.index_key.desc_len = strlen(description),
.cred = current_cred(),