2 * fs/cifs/cifs_spnego.c -- SPNEGO upcall management for CIFS
4 * Copyright (c) 2007 Red Hat, Inc.
5 * Author(s): Jeff Layton (jlayton@redhat.com)
7 * This library is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU Lesser General Public License as published
9 * by the Free Software Foundation; either version 2.1 of the License, or
10 * (at your option) any later version.
12 * This library is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
15 * the GNU Lesser General Public License for more details.
17 * You should have received a copy of the GNU Lesser General Public License
18 * along with this library; if not, write to the Free Software
19 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
22 #include <linux/list.h>
23 #include <linux/string.h>
24 #include <keys/user-type.h>
25 #include <linux/key-type.h>
27 #include "cifs_spnego.h"
28 #include "cifs_debug.h"
30 /* create a new cifs key */
32 cifs_spnego_key_instantiate(struct key *key, const void *data, size_t datalen)
38 payload = kmalloc(datalen, GFP_KERNEL);
43 memcpy(payload, data, datalen);
44 rcu_assign_pointer(key->payload.data, payload);
52 cifs_spnego_key_destroy(struct key *key)
54 kfree(key->payload.data);
59 * keytype for CIFS spnego keys
61 struct key_type cifs_spnego_key_type = {
62 .name = "cifs.spnego",
63 .instantiate = cifs_spnego_key_instantiate,
65 .destroy = cifs_spnego_key_destroy,
66 .describe = user_describe,
69 /* get a key struct with a SPNEGO security blob, suitable for session setup */
71 cifs_get_spnego_key(struct cifsSesInfo *sesInfo, const char *hostname)
73 struct TCP_Server_Info *server = sesInfo->server;
74 char *description, *dp;
76 struct key *spnego_key;
79 /* version + ;ip{4|6}= + address + ;host=hostname +
80 ;sec= + ;uid= + NULL */
81 desc_len = 4 + 5 + 32 + 1 + 5 + strlen(hostname) +
82 strlen(";sec=krb5") + 7 + sizeof(uid_t)*2 + 1;
83 spnego_key = ERR_PTR(-ENOMEM);
84 description = kzalloc(desc_len, GFP_KERNEL);
85 if (description == NULL)
89 /* start with version and hostname portion of UNC string */
90 spnego_key = ERR_PTR(-EINVAL);
91 sprintf(dp, "0x%2.2x;host=%s;", CIFS_SPNEGO_UPCALL_VERSION,
93 dp = description + strlen(description);
95 /* add the server address */
96 if (server->addr.sockAddr.sin_family == AF_INET)
97 sprintf(dp, "ip4=" NIPQUAD_FMT,
98 NIPQUAD(server->addr.sockAddr.sin_addr));
99 else if (server->addr.sockAddr.sin_family == AF_INET6)
100 sprintf(dp, "ip6=" NIP6_SEQFMT,
101 NIP6(server->addr.sockAddr6.sin6_addr));
105 dp = description + strlen(description);
107 /* for now, only sec=krb5 is valid */
108 if (server->secType == Kerberos)
109 sprintf(dp, ";sec=krb5");
113 dp = description + strlen(description);
114 sprintf(dp, ";uid=0x%x", sesInfo->linux_uid);
116 cFYI(1, ("key description = %s", description));
117 spnego_key = request_key(&cifs_spnego_key_type, description, "");
119 if (cifsFYI && !IS_ERR(spnego_key)) {
120 struct cifs_spnego_msg *msg = spnego_key->payload.data;
121 cifs_dump_mem("SPNEGO reply blob:", msg->data,
122 msg->secblob_len + msg->sesskey_len);