170 строки
3.7 KiB
C
170 строки
3.7 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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static const struct rxrpc_security *rxrpc_security_types[] = {
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[RXRPC_SECURITY_NONE] = &rxrpc_no_security,
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#ifdef CONFIG_RXKAD
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[RXRPC_SECURITY_RXKAD] = &rxkad,
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#endif
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};
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int __init rxrpc_init_security(void)
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{
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int i, ret;
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for (i = 0; i < ARRAY_SIZE(rxrpc_security_types); i++) {
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if (rxrpc_security_types[i]) {
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ret = rxrpc_security_types[i]->init();
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if (ret < 0)
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goto failed;
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}
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}
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return 0;
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failed:
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for (i--; i >= 0; i--)
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if (rxrpc_security_types[i])
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rxrpc_security_types[i]->exit();
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return ret;
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}
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void rxrpc_exit_security(void)
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{
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int i;
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for (i = 0; i < ARRAY_SIZE(rxrpc_security_types); i++)
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if (rxrpc_security_types[i])
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rxrpc_security_types[i]->exit();
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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 const struct rxrpc_security *rxrpc_security_lookup(u8 security_index)
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{
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if (security_index >= ARRAY_SIZE(rxrpc_security_types))
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return NULL;
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return rxrpc_security_types[security_index];
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}
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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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const struct rxrpc_security *sec;
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struct rxrpc_key_token *token;
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struct key *key = conn->params.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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conn->security = &rxrpc_no_security;
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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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const struct rxrpc_security *sec;
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struct rxrpc_local *local = conn->params.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", 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(&local->services_lock);
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rx = rcu_dereference_protected(local->service,
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lockdep_is_held(&local->services_lock));
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if (rx && (rx->srx.srx_service == conn->service_id ||
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rx->second_service == conn->service_id))
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goto found_service;
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/* the service appears to have died */
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read_unlock(&local->services_lock);
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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(&local->services_lock);
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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(&local->services_lock);
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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(&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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