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/*

 *   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, "");

        if (cifsFYI && !IS_ERR(spnego_key)) {

                struct cifs_spnego_msg *msg = spnego_key->payload.data;

                cifs_dump_mem("SPNEGO reply blob:", msg->data,

                                msg->secblob_len + msg->sesskey_len);

        }

out:

        kfree(description);

        return spnego_key;

}