161 lines
4.4 KiB
C
161 lines
4.4 KiB
C
/*
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* fs/cifs/cifs_spnego.c -- SPNEGO upcall management for CIFS
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*
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* Copyright (c) 2007 Red Hat, Inc.
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* Author(s): Jeff Layton (jlayton@redhat.com)
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*
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* This library is free software; you can redistribute it and/or modify
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* it under the terms of the GNU Lesser General Public License as published
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* by the Free Software Foundation; either version 2.1 of the License, or
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* (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
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* the GNU Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with this library; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include <linux/list.h>
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#include <linux/string.h>
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#include <keys/user-type.h>
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#include <linux/key-type.h>
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#include "cifsglob.h"
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#include "cifs_spnego.h"
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#include "cifs_debug.h"
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/* create a new cifs key */
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static int
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cifs_spnego_key_instantiate(struct key *key, const void *data, size_t datalen)
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{
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char *payload;
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int ret;
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ret = -ENOMEM;
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payload = kmalloc(datalen, GFP_KERNEL);
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if (!payload)
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goto error;
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/* attach the data */
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memcpy(payload, data, datalen);
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rcu_assign_pointer(key->payload.data, payload);
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ret = 0;
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error:
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return ret;
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}
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static void
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cifs_spnego_key_destroy(struct key *key)
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{
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kfree(key->payload.data);
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}
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/*
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* keytype for CIFS spnego keys
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*/
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struct key_type cifs_spnego_key_type = {
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.name = "cifs.spnego",
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.instantiate = cifs_spnego_key_instantiate,
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.match = user_match,
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.destroy = cifs_spnego_key_destroy,
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.describe = user_describe,
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};
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/* length of longest version string e.g. strlen("ver=0xFF") */
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#define MAX_VER_STR_LEN 8
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/* length of longest security mechanism name, eg in future could have
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* strlen(";sec=ntlmsspi") */
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#define MAX_MECH_STR_LEN 13
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/* max possible addr len eg FEDC:BA98:7654:3210:FEDC:BA98:7654:3210/128 */
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#define MAX_IPV6_ADDR_LEN 43
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/* strlen of "host=" */
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#define HOST_KEY_LEN 5
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/* strlen of ";ip4=" or ";ip6=" */
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#define IP_KEY_LEN 5
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/* strlen of ";uid=0x" */
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#define UID_KEY_LEN 7
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/* strlen of ";user=" */
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#define USER_KEY_LEN 6
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/* get a key struct with a SPNEGO security blob, suitable for session setup */
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struct key *
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cifs_get_spnego_key(struct cifsSesInfo *sesInfo)
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{
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struct TCP_Server_Info *server = sesInfo->server;
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char *description, *dp;
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size_t desc_len;
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struct key *spnego_key;
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const char *hostname = server->hostname;
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/* length of fields (with semicolons): ver=0xyz ip4=ipaddress
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host=hostname sec=mechanism uid=0xFF user=username */
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desc_len = MAX_VER_STR_LEN +
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HOST_KEY_LEN + strlen(hostname) +
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IP_KEY_LEN + MAX_IPV6_ADDR_LEN +
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MAX_MECH_STR_LEN +
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UID_KEY_LEN + (sizeof(uid_t) * 2) +
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USER_KEY_LEN + strlen(sesInfo->userName) + 1;
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spnego_key = ERR_PTR(-ENOMEM);
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description = kzalloc(desc_len, GFP_KERNEL);
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if (description == NULL)
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goto out;
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dp = description;
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/* start with version and hostname portion of UNC string */
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spnego_key = ERR_PTR(-EINVAL);
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sprintf(dp, "ver=0x%x;host=%s;", CIFS_SPNEGO_UPCALL_VERSION,
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hostname);
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dp = description + strlen(description);
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/* add the server address */
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if (server->addr.sockAddr.sin_family == AF_INET)
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sprintf(dp, "ip4=%pI4", &server->addr.sockAddr.sin_addr);
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else if (server->addr.sockAddr.sin_family == AF_INET6)
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sprintf(dp, "ip6=%pi6", &server->addr.sockAddr6.sin6_addr);
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else
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goto out;
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dp = description + strlen(description);
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/* for now, only sec=krb5 and sec=mskrb5 are valid */
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if (server->secType == Kerberos)
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sprintf(dp, ";sec=krb5");
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else if (server->secType == MSKerberos)
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sprintf(dp, ";sec=mskrb5");
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else
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goto out;
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dp = description + strlen(description);
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sprintf(dp, ";uid=0x%x", sesInfo->linux_uid);
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dp = description + strlen(description);
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sprintf(dp, ";user=%s", sesInfo->userName);
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cFYI(1, ("key description = %s", description));
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spnego_key = request_key(&cifs_spnego_key_type, description, "");
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#ifdef CONFIG_CIFS_DEBUG2
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if (cifsFYI && !IS_ERR(spnego_key)) {
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struct cifs_spnego_msg *msg = spnego_key->payload.data;
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cifs_dump_mem("SPNEGO reply blob:", msg->data, min(1024U,
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msg->secblob_len + msg->sesskey_len));
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}
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#endif /* CONFIG_CIFS_DEBUG2 */
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out:
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kfree(description);
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return spnego_key;
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}
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