159 lines
3.5 KiB
C
159 lines
3.5 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/* 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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#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 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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* Find the security key for a server connection.
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*/
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bool rxrpc_look_up_server_security(struct rxrpc_local *local, struct rxrpc_sock *rx,
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const struct rxrpc_security **_sec,
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struct key **_key,
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struct sk_buff *skb)
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{
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const struct rxrpc_security *sec;
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struct rxrpc_skb_priv *sp = rxrpc_skb(skb);
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key_ref_t kref = NULL;
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char kdesc[5 + 1 + 3 + 1];
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_enter("");
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sprintf(kdesc, "%u:%u", sp->hdr.serviceId, sp->hdr.securityIndex);
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sec = rxrpc_security_lookup(sp->hdr.securityIndex);
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if (!sec) {
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trace_rxrpc_abort(0, "SVS",
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sp->hdr.cid, sp->hdr.callNumber, sp->hdr.seq,
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RX_INVALID_OPERATION, EKEYREJECTED);
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skb->mark = RXRPC_SKB_MARK_REJECT_ABORT;
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skb->priority = RX_INVALID_OPERATION;
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return false;
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}
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if (sp->hdr.securityIndex == RXRPC_SECURITY_NONE)
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goto out;
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if (!rx->securities) {
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trace_rxrpc_abort(0, "SVR",
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sp->hdr.cid, sp->hdr.callNumber, sp->hdr.seq,
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RX_INVALID_OPERATION, EKEYREJECTED);
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skb->mark = RXRPC_SKB_MARK_REJECT_ABORT;
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skb->priority = RX_INVALID_OPERATION;
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return false;
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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, true);
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if (IS_ERR(kref)) {
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trace_rxrpc_abort(0, "SVK",
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sp->hdr.cid, sp->hdr.callNumber, sp->hdr.seq,
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sec->no_key_abort, EKEYREJECTED);
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skb->mark = RXRPC_SKB_MARK_REJECT_ABORT;
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skb->priority = sec->no_key_abort;
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return false;
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}
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out:
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*_sec = sec;
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*_key = key_ref_to_ptr(kref);
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return true;
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}
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