![David Howells](/assets/img/avatar_default.png)
Merge the type-specific data with the payload data into one four-word chunk as it seems pointless to keep them separate. Use user_key_payload() for accessing the payloads of overloaded user-defined keys. Signed-off-by: David Howells <dhowells@redhat.com> cc: linux-cifs@vger.kernel.org cc: ecryptfs@vger.kernel.org cc: linux-ext4@vger.kernel.org cc: linux-f2fs-devel@lists.sourceforge.net cc: linux-nfs@vger.kernel.org cc: ceph-devel@vger.kernel.org cc: linux-ima-devel@lists.sourceforge.net
265 lines
5.6 KiB
C
265 lines
5.6 KiB
C
/* RxRPC security handling
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*
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* Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
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* Written by David Howells (dhowells@redhat.com)
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*/
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#include <linux/module.h>
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#include <linux/net.h>
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#include <linux/skbuff.h>
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#include <linux/udp.h>
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#include <linux/crypto.h>
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#include <net/sock.h>
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#include <net/af_rxrpc.h>
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#include <keys/rxrpc-type.h>
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#include "ar-internal.h"
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static LIST_HEAD(rxrpc_security_methods);
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static DECLARE_RWSEM(rxrpc_security_sem);
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/*
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* get an RxRPC security module
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*/
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static struct rxrpc_security *rxrpc_security_get(struct rxrpc_security *sec)
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{
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return try_module_get(sec->owner) ? sec : NULL;
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}
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/*
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* release an RxRPC security module
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*/
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static void rxrpc_security_put(struct rxrpc_security *sec)
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{
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module_put(sec->owner);
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}
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/*
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* look up an rxrpc security module
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*/
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static struct rxrpc_security *rxrpc_security_lookup(u8 security_index)
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{
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struct rxrpc_security *sec = NULL;
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_enter("");
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down_read(&rxrpc_security_sem);
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list_for_each_entry(sec, &rxrpc_security_methods, link) {
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if (sec->security_index == security_index) {
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if (unlikely(!rxrpc_security_get(sec)))
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break;
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goto out;
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}
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}
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sec = NULL;
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out:
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up_read(&rxrpc_security_sem);
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_leave(" = %p [%s]", sec, sec ? sec->name : "");
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return sec;
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}
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/**
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* rxrpc_register_security - register an RxRPC security handler
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* @sec: security module
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*
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* register an RxRPC security handler for use by RxRPC
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*/
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int rxrpc_register_security(struct rxrpc_security *sec)
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{
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struct rxrpc_security *psec;
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int ret;
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_enter("");
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down_write(&rxrpc_security_sem);
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ret = -EEXIST;
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list_for_each_entry(psec, &rxrpc_security_methods, link) {
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if (psec->security_index == sec->security_index)
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goto out;
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}
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list_add(&sec->link, &rxrpc_security_methods);
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printk(KERN_NOTICE "RxRPC: Registered security type %d '%s'\n",
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sec->security_index, sec->name);
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ret = 0;
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out:
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up_write(&rxrpc_security_sem);
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_leave(" = %d", ret);
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return ret;
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}
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EXPORT_SYMBOL_GPL(rxrpc_register_security);
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/**
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* rxrpc_unregister_security - unregister an RxRPC security handler
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* @sec: security module
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*
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* unregister an RxRPC security handler
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*/
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void rxrpc_unregister_security(struct rxrpc_security *sec)
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{
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_enter("");
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down_write(&rxrpc_security_sem);
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list_del_init(&sec->link);
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up_write(&rxrpc_security_sem);
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printk(KERN_NOTICE "RxRPC: Unregistered security type %d '%s'\n",
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sec->security_index, sec->name);
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}
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EXPORT_SYMBOL_GPL(rxrpc_unregister_security);
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/*
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* initialise the security on a client connection
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*/
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int rxrpc_init_client_conn_security(struct rxrpc_connection *conn)
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{
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struct rxrpc_key_token *token;
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struct rxrpc_security *sec;
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struct key *key = conn->key;
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int ret;
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_enter("{%d},{%x}", conn->debug_id, key_serial(key));
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if (!key)
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return 0;
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ret = key_validate(key);
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if (ret < 0)
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return ret;
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token = key->payload.data[0];
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if (!token)
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return -EKEYREJECTED;
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sec = rxrpc_security_lookup(token->security_index);
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if (!sec)
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return -EKEYREJECTED;
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conn->security = sec;
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ret = conn->security->init_connection_security(conn);
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if (ret < 0) {
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rxrpc_security_put(conn->security);
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conn->security = NULL;
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return ret;
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}
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_leave(" = 0");
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return 0;
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}
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/*
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* initialise the security on a server connection
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*/
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int rxrpc_init_server_conn_security(struct rxrpc_connection *conn)
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{
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struct rxrpc_security *sec;
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struct rxrpc_local *local = conn->trans->local;
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struct rxrpc_sock *rx;
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struct key *key;
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key_ref_t kref;
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char kdesc[5+1+3+1];
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_enter("");
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sprintf(kdesc, "%u:%u", ntohs(conn->service_id), conn->security_ix);
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sec = rxrpc_security_lookup(conn->security_ix);
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if (!sec) {
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_leave(" = -ENOKEY [lookup]");
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return -ENOKEY;
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}
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/* find the service */
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read_lock_bh(&local->services_lock);
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list_for_each_entry(rx, &local->services, listen_link) {
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if (rx->service_id == conn->service_id)
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goto found_service;
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}
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/* the service appears to have died */
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read_unlock_bh(&local->services_lock);
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rxrpc_security_put(sec);
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_leave(" = -ENOENT");
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return -ENOENT;
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found_service:
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if (!rx->securities) {
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read_unlock_bh(&local->services_lock);
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rxrpc_security_put(sec);
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_leave(" = -ENOKEY");
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return -ENOKEY;
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}
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/* look through the service's keyring */
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kref = keyring_search(make_key_ref(rx->securities, 1UL),
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&key_type_rxrpc_s, kdesc);
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if (IS_ERR(kref)) {
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read_unlock_bh(&local->services_lock);
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rxrpc_security_put(sec);
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_leave(" = %ld [search]", PTR_ERR(kref));
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return PTR_ERR(kref);
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}
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key = key_ref_to_ptr(kref);
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read_unlock_bh(&local->services_lock);
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conn->server_key = key;
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conn->security = sec;
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_leave(" = 0");
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return 0;
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}
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/*
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* secure a packet prior to transmission
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*/
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int rxrpc_secure_packet(const struct rxrpc_call *call,
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struct sk_buff *skb,
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size_t data_size,
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void *sechdr)
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{
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if (call->conn->security)
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return call->conn->security->secure_packet(
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call, skb, data_size, sechdr);
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return 0;
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}
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/*
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* secure a packet prior to transmission
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*/
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int rxrpc_verify_packet(const struct rxrpc_call *call, struct sk_buff *skb,
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u32 *_abort_code)
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{
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if (call->conn->security)
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return call->conn->security->verify_packet(
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call, skb, _abort_code);
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return 0;
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}
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/*
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* clear connection security
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*/
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void rxrpc_clear_conn_security(struct rxrpc_connection *conn)
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{
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_enter("{%d}", conn->debug_id);
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if (conn->security) {
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conn->security->clear(conn);
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rxrpc_security_put(conn->security);
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conn->security = NULL;
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}
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key_put(conn->key);
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key_put(conn->server_key);
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}
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