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 #define MAX_VER_STR_LEN 8 /* length of longest version string e.g.
71 #define MAX_MECH_STR_LEN 13 /* length of longest security mechanism name, eg
72 in future could have strlen(";sec=ntlmsspi") */
73 /* max possible addr len eg FEDC:BA98:7654:3210:FEDC:BA98:7654:3210/128 */
74 #define MAX_IPV6_ADDR_LEN 43
75 /* get a key struct with a SPNEGO security blob, suitable for session setup */
77 cifs_get_spnego_key(struct cifsSesInfo
*sesInfo
)
79 struct TCP_Server_Info
*server
= sesInfo
->server
;
80 char *description
, *dp
;
82 struct key
*spnego_key
;
83 const char *hostname
= server
->hostname
;
85 /* length of fields (with semicolons): ver=0xyz ip4=ipaddress
86 host=hostname sec=mechanism uid=0xFF user=username */
87 desc_len
= MAX_VER_STR_LEN
+
88 6 /* len of "host=" */ + strlen(hostname
) +
89 5 /* len of ";ipv4=" */ + MAX_IPV6_ADDR_LEN
+
91 7 /* len of ";uid=0x" */ + (sizeof(uid_t
) * 2) +
92 6 /* len of ";user=" */ + strlen(sesInfo
->userName
) + 1;
94 spnego_key
= ERR_PTR(-ENOMEM
);
95 description
= kzalloc(desc_len
, GFP_KERNEL
);
96 if (description
== NULL
)
100 /* start with version and hostname portion of UNC string */
101 spnego_key
= ERR_PTR(-EINVAL
);
102 sprintf(dp
, "ver=0x%x;host=%s;", CIFS_SPNEGO_UPCALL_VERSION
,
104 dp
= description
+ strlen(description
);
106 /* add the server address */
107 if (server
->addr
.sockAddr
.sin_family
== AF_INET
)
108 sprintf(dp
, "ip4=" NIPQUAD_FMT
,
109 NIPQUAD(server
->addr
.sockAddr
.sin_addr
));
110 else if (server
->addr
.sockAddr
.sin_family
== AF_INET6
)
111 sprintf(dp
, "ip6=" NIP6_SEQFMT
,
112 NIP6(server
->addr
.sockAddr6
.sin6_addr
));
116 dp
= description
+ strlen(description
);
118 /* for now, only sec=krb5 and sec=mskrb5 are valid */
119 if (server
->secType
== Kerberos
)
120 sprintf(dp
, ";sec=krb5");
121 else if (server
->secType
== MSKerberos
)
122 sprintf(dp
, ";sec=mskrb5");
126 dp
= description
+ strlen(description
);
127 sprintf(dp
, ";uid=0x%x", sesInfo
->linux_uid
);
129 dp
= description
+ strlen(description
);
130 sprintf(dp
, ";user=%s", sesInfo
->userName
);
132 cFYI(1, ("key description = %s", description
));
133 spnego_key
= request_key(&cifs_spnego_key_type
, description
, "");
135 #ifdef CONFIG_CIFS_DEBUG2
136 if (cifsFYI
&& !IS_ERR(spnego_key
)) {
137 struct cifs_spnego_msg
*msg
= spnego_key
->payload
.data
;
138 cifs_dump_mem("SPNEGO reply blob:", msg
->data
, min(1024U,
139 msg
->secblob_len
+ msg
->sesskey_len
));
141 #endif /* CONFIG_CIFS_DEBUG2 */