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rxrpc: Absorb the rxkad security module 

Absorb the rxkad security module into the af_rxrpc module so that there's
only one module file.  This avoids a circular dependency whereby rxkad pins
af_rxrpc and cached connections pin rxkad but can't be manually evicted
(they will expire eventually and cease pinning).

With this change, af_rxrpc can just be unloaded, despite having cached
connections.

Signed-off-by: David Howells <dhowells@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David Howells 2016-04-07 17:23:51 +01:00 committed by David S. Miller
parent 6dd050f88d
commit 648af7fca1
6 changed files with 89 additions and 138 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
net/rxrpc/Kconfig
View File

@ -30,7 +30,7 @@ config AF_RXRPC_DEBUG
config RXKAD
tristate "RxRPC Kerberos security"
bool "RxRPC Kerberos security"
depends on AF_RXRPC
select CRYPTO
select CRYPTO_MANAGER

3
net/rxrpc/Makefile
View File

@ -22,8 +22,7 @@ af-rxrpc-y := \
misc.o
af-rxrpc-$(CONFIG_PROC_FS) += ar-proc.o
af-rxrpc-$(CONFIG_RXKAD) += rxkad.o
af-rxrpc-$(CONFIG_SYSCTL) += sysctl.o
obj-$(CONFIG_AF_RXRPC) += af-rxrpc.o
obj-$(CONFIG_RXKAD) += rxkad.o

9
net/rxrpc/af_rxrpc.c
View File

@ -806,6 +806,12 @@ static int __init af_rxrpc_init(void)
goto error_work_queue;
}
ret = rxrpc_init_security();
if (ret < 0) {
printk(KERN_CRIT "RxRPC: Cannot initialise security\n");
goto error_security;
}
ret = proto_register(&rxrpc_proto, 1);
if (ret < 0) {
printk(KERN_CRIT "RxRPC: Cannot register protocol\n");
@ -853,6 +859,8 @@ error_sock:
proto_unregister(&rxrpc_proto);
error_proto:
destroy_workqueue(rxrpc_workqueue);
error_security:
rxrpc_exit_security();
error_work_queue:
kmem_cache_destroy(rxrpc_call_jar);
error_call_jar:
@ -883,6 +891,7 @@ static void __exit af_rxrpc_exit(void)
remove_proc_entry("rxrpc_conns", init_net.proc_net);
remove_proc_entry("rxrpc_calls", init_net.proc_net);
destroy_workqueue(rxrpc_workqueue);
rxrpc_exit_security();
kmem_cache_destroy(rxrpc_call_jar);
_leave("");
}

21
net/rxrpc/ar-internal.h
View File

@ -124,11 +124,15 @@ enum rxrpc_command {
* RxRPC security module interface
*/
struct rxrpc_security {
struct module *owner; /* providing module */
struct list_head link; /* link in master list */
const char *name; /* name of this service */
u8 security_index; /* security type provided */
/* Initialise a security service */
int (*init)(void);
/* Clean up a security service */
void (*exit)(void);
/* initialise a connection's security */
int (*init_connection_security)(struct rxrpc_connection *);
@ -268,7 +272,7 @@ struct rxrpc_connection {
struct rb_root calls; /* calls on this connection */
struct sk_buff_head rx_queue; /* received conn-level packets */
struct rxrpc_call *channels[RXRPC_MAXCALLS]; /* channels (active calls) */
struct rxrpc_security *security; /* applied security module */
const struct rxrpc_security *security; /* applied security module */
struct key *key; /* security for this connection (client) */
struct key *server_key; /* security for this service */
struct crypto_skcipher *cipher; /* encryption handle */
@ -604,8 +608,8 @@ int rxrpc_recvmsg(struct socket *, struct msghdr *, size_t, int);
/*
* ar-security.c
*/
int rxrpc_register_security(struct rxrpc_security *);
void rxrpc_unregister_security(struct rxrpc_security *);
int __init rxrpc_init_security(void);
void rxrpc_exit_security(void);
int rxrpc_init_client_conn_security(struct rxrpc_connection *);
int rxrpc_init_server_conn_security(struct rxrpc_connection *);
int rxrpc_secure_packet(const struct rxrpc_call *, struct sk_buff *, size_t,
@ -645,6 +649,13 @@ extern const s8 rxrpc_ack_priority[];
extern const char *rxrpc_acks(u8 reason);
/*
* rxkad.c
*/
#ifdef CONFIG_RXKAD
extern const struct rxrpc_security rxkad;
#endif
/*
* sysctl.c
*/

131
net/rxrpc/ar-security.c
View File

@ -22,109 +22,59 @@
static LIST_HEAD(rxrpc_security_methods);
static DECLARE_RWSEM(rxrpc_security_sem);
/*
* get an RxRPC security module
*/
static struct rxrpc_security *rxrpc_security_get(struct rxrpc_security *sec)
static const struct rxrpc_security *rxrpc_security_types[] = {
#ifdef CONFIG_RXKAD
[RXRPC_SECURITY_RXKAD] = &rxkad,
#endif
};
int __init rxrpc_init_security(void)
{
return try_module_get(sec->owner) ? sec : NULL;
int i, ret;
for (i = 0; i < ARRAY_SIZE(rxrpc_security_types); i++) {
if (rxrpc_security_types[i]) {
ret = rxrpc_security_types[i]->init();
if (ret < 0)
goto failed;
}
}
return 0;
failed:
for (i--; i >= 0; i--)
if (rxrpc_security_types[i])
rxrpc_security_types[i]->exit();
return ret;
}
/*
* release an RxRPC security module
*/
static void rxrpc_security_put(struct rxrpc_security *sec)
void rxrpc_exit_security(void)
{
module_put(sec->owner);
int i;
for (i = 0; i < ARRAY_SIZE(rxrpc_security_types); i++)
if (rxrpc_security_types[i])
rxrpc_security_types[i]->exit();
}
/*
* look up an rxrpc security module
*/
static struct rxrpc_security *rxrpc_security_lookup(u8 security_index)
static const struct rxrpc_security *rxrpc_security_lookup(u8 security_index)
{
struct rxrpc_security *sec = NULL;
_enter("");
down_read(&rxrpc_security_sem);
list_for_each_entry(sec, &rxrpc_security_methods, link) {
if (sec->security_index == security_index) {
if (unlikely(!rxrpc_security_get(sec)))
break;
goto out;
}
}
sec = NULL;
out:
up_read(&rxrpc_security_sem);
_leave(" = %p [%s]", sec, sec ? sec->name : "");
return sec;
if (security_index >= ARRAY_SIZE(rxrpc_security_types))
return NULL;
return rxrpc_security_types[security_index];
}
/**
* rxrpc_register_security - register an RxRPC security handler
* @sec: security module
*
* register an RxRPC security handler for use by RxRPC
*/
int rxrpc_register_security(struct rxrpc_security *sec)
{
struct rxrpc_security *psec;
int ret;
_enter("");
down_write(&rxrpc_security_sem);
ret = -EEXIST;
list_for_each_entry(psec, &rxrpc_security_methods, link) {
if (psec->security_index == sec->security_index)
goto out;
}
list_add(&sec->link, &rxrpc_security_methods);
printk(KERN_NOTICE "RxRPC: Registered security type %d '%s'\n",
sec->security_index, sec->name);
ret = 0;
out:
up_write(&rxrpc_security_sem);
_leave(" = %d", ret);
return ret;
}
EXPORT_SYMBOL_GPL(rxrpc_register_security);
/**
* rxrpc_unregister_security - unregister an RxRPC security handler
* @sec: security module
*
* unregister an RxRPC security handler
*/
void rxrpc_unregister_security(struct rxrpc_security *sec)
{
_enter("");
down_write(&rxrpc_security_sem);
list_del_init(&sec->link);
up_write(&rxrpc_security_sem);
printk(KERN_NOTICE "RxRPC: Unregistered security type %d '%s'\n",
sec->security_index, sec->name);
}
EXPORT_SYMBOL_GPL(rxrpc_unregister_security);
/*
* initialise the security on a client connection
*/
int rxrpc_init_client_conn_security(struct rxrpc_connection *conn)
{
const struct rxrpc_security *sec;
struct rxrpc_key_token *token;
struct rxrpc_security *sec;
struct key *key = conn->key;
int ret;
@ -148,7 +98,6 @@ int rxrpc_init_client_conn_security(struct rxrpc_connection *conn)
ret = conn->security->init_connection_security(conn);
if (ret < 0) {
rxrpc_security_put(conn->security);
conn->security = NULL;
return ret;
}
@ -162,7 +111,7 @@ int rxrpc_init_client_conn_security(struct rxrpc_connection *conn)
*/
int rxrpc_init_server_conn_security(struct rxrpc_connection *conn)
{
struct rxrpc_security *sec;
const struct rxrpc_security *sec;
struct rxrpc_local *local = conn->trans->local;
struct rxrpc_sock *rx;
struct key *key;
@ -188,14 +137,12 @@ int rxrpc_init_server_conn_security(struct rxrpc_connection *conn)
/* the service appears to have died */
read_unlock_bh(&local->services_lock);
rxrpc_security_put(sec);
_leave(" = -ENOENT");
return -ENOENT;
found_service:
if (!rx->securities) {
read_unlock_bh(&local->services_lock);
rxrpc_security_put(sec);
_leave(" = -ENOKEY");
return -ENOKEY;
}
@ -205,7 +152,6 @@ found_service:
&key_type_rxrpc_s, kdesc);
if (IS_ERR(kref)) {
read_unlock_bh(&local->services_lock);
rxrpc_security_put(sec);
_leave(" = %ld [search]", PTR_ERR(kref));
return PTR_ERR(kref);
}
@ -253,11 +199,8 @@ void rxrpc_clear_conn_security(struct rxrpc_connection *conn)
{
_enter("{%d}", conn->debug_id);
if (conn->security) {
if (conn->security)
conn->security->clear(conn);
rxrpc_security_put(conn->security);
conn->security = NULL;
}
key_put(conn->key);
key_put(conn->server_key);

61
net/rxrpc/rxkad.c
View File

@ -20,7 +20,6 @@
#include <net/sock.h>
#include <net/af_rxrpc.h>
#include <keys/rxrpc-type.h>
#define rxrpc_debug rxkad_debug
#include "ar-internal.h"
#define RXKAD_VERSION 2
@ -31,10 +30,6 @@
#define REALM_SZ 40 /* size of principal's auth domain */
#define SNAME_SZ 40 /* size of service name */
unsigned int rxrpc_debug;
module_param_named(debug, rxrpc_debug, uint, S_IWUSR | S_IRUGO);
MODULE_PARM_DESC(debug, "rxkad debugging mask");
struct rxkad_level1_hdr {
__be32 data_size; /* true data size (excluding padding) */
};
@ -44,10 +39,6 @@ struct rxkad_level2_hdr {
__be32 checksum; /* decrypted data checksum */
};
MODULE_DESCRIPTION("RxRPC network protocol type-2 security (Kerberos 4)");
MODULE_AUTHOR("Red Hat, Inc.");
MODULE_LICENSE("GPL");
/*
* this holds a pinned cipher so that keventd doesn't get called by the cipher
* alloc routine, but since we have it to hand, we use it to decrypt RESPONSE
@ -1163,13 +1154,36 @@ static void rxkad_clear(struct rxrpc_connection *conn)
crypto_free_skcipher(conn->cipher);
}
/*
* Initialise the rxkad security service.
*/
static int rxkad_init(void)
{
/* pin the cipher we need so that the crypto layer doesn't invoke
* keventd to go get it */
rxkad_ci = crypto_alloc_skcipher("pcbc(fcrypt)", 0, CRYPTO_ALG_ASYNC);
if (IS_ERR(rxkad_ci))
return PTR_ERR(rxkad_ci);
return 0;
}
/*
* Clean up the rxkad security service.
*/
static void rxkad_exit(void)
{
if (rxkad_ci)
crypto_free_skcipher(rxkad_ci);
}
/*
* RxRPC Kerberos-based security
*/
static struct rxrpc_security rxkad = {
.owner = THIS_MODULE,
const struct rxrpc_security rxkad = {
.name = "rxkad",
.security_index = RXRPC_SECURITY_RXKAD,
.init = rxkad_init,
.exit = rxkad_exit,
.init_connection_security = rxkad_init_connection_security,
.prime_packet_security = rxkad_prime_packet_security,
.secure_packet = rxkad_secure_packet,
@ -1179,28 +1193,3 @@ static struct rxrpc_security rxkad = {
.verify_response = rxkad_verify_response,
.clear = rxkad_clear,
};
static __init int rxkad_init(void)
{
_enter("");
/* pin the cipher we need so that the crypto layer doesn't invoke
* keventd to go get it */
rxkad_ci = crypto_alloc_skcipher("pcbc(fcrypt)", 0, CRYPTO_ALG_ASYNC);
if (IS_ERR(rxkad_ci))
return PTR_ERR(rxkad_ci);
return rxrpc_register_security(&rxkad);
}
module_init(rxkad_init);
static __exit void rxkad_exit(void)
{
_enter("");
rxrpc_unregister_security(&rxkad);
crypto_free_skcipher(rxkad_ci);
}
module_exit(rxkad_exit);