mirror of https://gitee.com/openkylin/linux.git
137 lines
4.0 KiB
C
137 lines
4.0 KiB
C
/*
|
|
* fs/cifs/cifs_spnego.c -- SPNEGO upcall management for CIFS
|
|
*
|
|
* Copyright (c) 2007 Red Hat, Inc.
|
|
* Author(s): Jeff Layton (jlayton@redhat.com)
|
|
*
|
|
* This library is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU Lesser General Public License as published
|
|
* by the Free Software Foundation; either version 2.1 of the License, or
|
|
* (at your option) any later version.
|
|
*
|
|
* This library is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
|
|
* the GNU Lesser General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU Lesser General Public License
|
|
* along with this library; if not, write to the Free Software
|
|
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
|
|
*/
|
|
|
|
#include <linux/list.h>
|
|
#include <linux/string.h>
|
|
#include <keys/user-type.h>
|
|
#include <linux/key-type.h>
|
|
#include "cifsglob.h"
|
|
#include "cifs_spnego.h"
|
|
#include "cifs_debug.h"
|
|
|
|
/* create a new cifs key */
|
|
static int
|
|
cifs_spnego_key_instantiate(struct key *key, const void *data, size_t datalen)
|
|
{
|
|
char *payload;
|
|
int ret;
|
|
|
|
ret = -ENOMEM;
|
|
payload = kmalloc(datalen, GFP_KERNEL);
|
|
if (!payload)
|
|
goto error;
|
|
|
|
/* attach the data */
|
|
memcpy(payload, data, datalen);
|
|
rcu_assign_pointer(key->payload.data, payload);
|
|
ret = 0;
|
|
|
|
error:
|
|
return ret;
|
|
}
|
|
|
|
static void
|
|
cifs_spnego_key_destroy(struct key *key)
|
|
{
|
|
kfree(key->payload.data);
|
|
}
|
|
|
|
|
|
/*
|
|
* keytype for CIFS spnego keys
|
|
*/
|
|
struct key_type cifs_spnego_key_type = {
|
|
.name = "cifs.spnego",
|
|
.instantiate = cifs_spnego_key_instantiate,
|
|
.match = user_match,
|
|
.destroy = cifs_spnego_key_destroy,
|
|
.describe = user_describe,
|
|
};
|
|
|
|
#define MAX_VER_STR_LEN 9 /* length of longest version string e.g.
|
|
strlen(";ver=0xFF") */
|
|
#define MAX_MECH_STR_LEN 13 /* length of longest security mechanism name, eg
|
|
in future could have strlen(";sec=ntlmsspi") */
|
|
#define MAX_IPV6_ADDR_LEN 42 /* eg FEDC:BA98:7654:3210:FEDC:BA98:7654:3210/60 */
|
|
/* get a key struct with a SPNEGO security blob, suitable for session setup */
|
|
struct key *
|
|
cifs_get_spnego_key(struct cifsSesInfo *sesInfo)
|
|
{
|
|
struct TCP_Server_Info *server = sesInfo->server;
|
|
char *description, *dp;
|
|
size_t desc_len;
|
|
struct key *spnego_key;
|
|
const char *hostname = server->hostname;
|
|
|
|
/* BB: come up with better scheme for determining length */
|
|
/* length of fields (with semicolons): ver=0xyz ipv4= ipaddress host=
|
|
hostname sec=mechanism uid=0x uid */
|
|
desc_len = MAX_VER_STR_LEN + 5 + MAX_IPV6_ADDR_LEN + 1 + 6 +
|
|
strlen(hostname) + MAX_MECH_STR_LEN + 8 + (sizeof(uid_t) * 2);
|
|
spnego_key = ERR_PTR(-ENOMEM);
|
|
description = kzalloc(desc_len, GFP_KERNEL);
|
|
if (description == NULL)
|
|
goto out;
|
|
|
|
dp = description;
|
|
/* start with version and hostname portion of UNC string */
|
|
spnego_key = ERR_PTR(-EINVAL);
|
|
sprintf(dp, "ver=0x%x;host=%s;", CIFS_SPNEGO_UPCALL_VERSION,
|
|
hostname);
|
|
dp = description + strlen(description);
|
|
|
|
/* add the server address */
|
|
if (server->addr.sockAddr.sin_family == AF_INET)
|
|
sprintf(dp, "ip4=" NIPQUAD_FMT,
|
|
NIPQUAD(server->addr.sockAddr.sin_addr));
|
|
else if (server->addr.sockAddr.sin_family == AF_INET6)
|
|
sprintf(dp, "ip6=" NIP6_SEQFMT,
|
|
NIP6(server->addr.sockAddr6.sin6_addr));
|
|
else
|
|
goto out;
|
|
|
|
dp = description + strlen(description);
|
|
|
|
/* for now, only sec=krb5 is valid */
|
|
if (server->secType == Kerberos)
|
|
sprintf(dp, ";sec=krb5");
|
|
else
|
|
goto out;
|
|
|
|
dp = description + strlen(description);
|
|
sprintf(dp, ";uid=0x%x", sesInfo->linux_uid);
|
|
|
|
cFYI(1, ("key description = %s", description));
|
|
spnego_key = request_key(&cifs_spnego_key_type, description, "");
|
|
|
|
#ifdef CONFIG_CIFS_DEBUG2
|
|
if (cifsFYI && !IS_ERR(spnego_key)) {
|
|
struct cifs_spnego_msg *msg = spnego_key->payload.data;
|
|
cifs_dump_mem("SPNEGO reply blob:", msg->data, min(1024U,
|
|
msg->secblob_len + msg->sesskey_len));
|
|
}
|
|
#endif /* CONFIG_CIFS_DEBUG2 */
|
|
|
|
out:
|
|
kfree(description);
|
|
return spnego_key;
|
|
}
|