147 строки
3.5 KiB
C
147 строки
3.5 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/* RxRPC key management
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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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* RxRPC keys should have a description of describing their purpose:
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* "afs@CAMBRIDGE.REDHAT.COM>
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*/
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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#include <crypto/skcipher.h>
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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/key-type.h>
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#include <linux/ctype.h>
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#include <linux/slab.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 <keys/user-type.h>
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#include "ar-internal.h"
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static int rxrpc_vet_description_s(const char *);
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static int rxrpc_preparse_s(struct key_preparsed_payload *);
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static void rxrpc_free_preparse_s(struct key_preparsed_payload *);
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static void rxrpc_destroy_s(struct key *);
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static void rxrpc_describe_s(const struct key *, struct seq_file *);
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/*
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* rxrpc server keys take "<serviceId>:<securityIndex>[:<sec-specific>]" as the
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* description and the key material as the payload.
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*/
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struct key_type key_type_rxrpc_s = {
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.name = "rxrpc_s",
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.flags = KEY_TYPE_NET_DOMAIN,
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.vet_description = rxrpc_vet_description_s,
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.preparse = rxrpc_preparse_s,
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.free_preparse = rxrpc_free_preparse_s,
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.instantiate = generic_key_instantiate,
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.destroy = rxrpc_destroy_s,
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.describe = rxrpc_describe_s,
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};
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/*
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* Vet the description for an RxRPC server key.
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*/
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static int rxrpc_vet_description_s(const char *desc)
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{
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unsigned long service, sec_class;
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char *p;
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service = simple_strtoul(desc, &p, 10);
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if (*p != ':' || service > 65535)
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return -EINVAL;
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sec_class = simple_strtoul(p + 1, &p, 10);
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if ((*p && *p != ':') || sec_class < 1 || sec_class > 255)
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return -EINVAL;
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return 0;
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}
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/*
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* Preparse a server secret key.
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*/
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static int rxrpc_preparse_s(struct key_preparsed_payload *prep)
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{
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const struct rxrpc_security *sec;
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unsigned int service, sec_class;
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int n;
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_enter("%zu", prep->datalen);
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if (!prep->orig_description)
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return -EINVAL;
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if (sscanf(prep->orig_description, "%u:%u%n", &service, &sec_class, &n) != 2)
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return -EINVAL;
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sec = rxrpc_security_lookup(sec_class);
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if (!sec)
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return -ENOPKG;
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prep->payload.data[1] = (struct rxrpc_security *)sec;
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if (!sec->preparse_server_key)
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return -EINVAL;
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return sec->preparse_server_key(prep);
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}
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static void rxrpc_free_preparse_s(struct key_preparsed_payload *prep)
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{
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const struct rxrpc_security *sec = prep->payload.data[1];
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if (sec && sec->free_preparse_server_key)
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sec->free_preparse_server_key(prep);
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}
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static void rxrpc_destroy_s(struct key *key)
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{
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const struct rxrpc_security *sec = key->payload.data[1];
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if (sec && sec->destroy_server_key)
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sec->destroy_server_key(key);
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}
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static void rxrpc_describe_s(const struct key *key, struct seq_file *m)
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{
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const struct rxrpc_security *sec = key->payload.data[1];
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seq_puts(m, key->description);
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if (sec && sec->describe_server_key)
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sec->describe_server_key(key, m);
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}
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/*
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* grab the security keyring for a server socket
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*/
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int rxrpc_server_keyring(struct rxrpc_sock *rx, sockptr_t optval, int optlen)
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{
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struct key *key;
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char *description;
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_enter("");
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if (optlen <= 0 || optlen > PAGE_SIZE - 1)
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return -EINVAL;
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description = memdup_sockptr_nul(optval, optlen);
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if (IS_ERR(description))
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return PTR_ERR(description);
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key = request_key(&key_type_keyring, description, NULL);
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if (IS_ERR(key)) {
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kfree(description);
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_leave(" = %ld", PTR_ERR(key));
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return PTR_ERR(key);
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}
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rx->securities = key;
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kfree(description);
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_leave(" = 0 [key %x]", key->serial);
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return 0;
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}
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