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>
26 #include <linux/inet.h>
28 #include "cifs_spnego.h"
29 #include "cifs_debug.h"
31 /* create a new cifs key */
33 cifs_spnego_key_instantiate(struct key
*key
, const void *data
, size_t datalen
)
39 payload
= kmalloc(datalen
, GFP_KERNEL
);
44 memcpy(payload
, data
, datalen
);
45 key
->payload
.data
= payload
;
53 cifs_spnego_key_destroy(struct key
*key
)
55 kfree(key
->payload
.data
);
60 * keytype for CIFS spnego keys
62 struct key_type cifs_spnego_key_type
= {
63 .name
= "cifs.spnego",
64 .instantiate
= cifs_spnego_key_instantiate
,
66 .destroy
= cifs_spnego_key_destroy
,
67 .describe
= user_describe
,
70 /* length of longest version string e.g. strlen("ver=0xFF") */
71 #define MAX_VER_STR_LEN 8
73 /* length of longest security mechanism name, eg in future could have
74 * strlen(";sec=ntlmsspi") */
75 #define MAX_MECH_STR_LEN 13
77 /* strlen of "host=" */
78 #define HOST_KEY_LEN 5
80 /* strlen of ";ip4=" or ";ip6=" */
83 /* strlen of ";uid=0x" */
86 /* strlen of ";user=" */
87 #define USER_KEY_LEN 6
89 /* get a key struct with a SPNEGO security blob, suitable for session setup */
91 cifs_get_spnego_key(struct cifsSesInfo
*sesInfo
)
93 struct TCP_Server_Info
*server
= sesInfo
->server
;
94 char *description
, *dp
;
96 struct key
*spnego_key
;
97 const char *hostname
= server
->hostname
;
99 /* length of fields (with semicolons): ver=0xyz ip4=ipaddress
100 host=hostname sec=mechanism uid=0xFF user=username */
101 desc_len
= MAX_VER_STR_LEN
+
102 HOST_KEY_LEN
+ strlen(hostname
) +
103 IP_KEY_LEN
+ INET6_ADDRSTRLEN
+
105 UID_KEY_LEN
+ (sizeof(uid_t
) * 2) +
106 USER_KEY_LEN
+ strlen(sesInfo
->userName
) + 1;
108 spnego_key
= ERR_PTR(-ENOMEM
);
109 description
= kzalloc(desc_len
, GFP_KERNEL
);
110 if (description
== NULL
)
114 /* start with version and hostname portion of UNC string */
115 spnego_key
= ERR_PTR(-EINVAL
);
116 sprintf(dp
, "ver=0x%x;host=%s;", CIFS_SPNEGO_UPCALL_VERSION
,
118 dp
= description
+ strlen(description
);
120 /* add the server address */
121 if (server
->addr
.sockAddr
.sin_family
== AF_INET
)
122 sprintf(dp
, "ip4=%pI4", &server
->addr
.sockAddr
.sin_addr
);
123 else if (server
->addr
.sockAddr
.sin_family
== AF_INET6
)
124 sprintf(dp
, "ip6=%pi6", &server
->addr
.sockAddr6
.sin6_addr
);
128 dp
= description
+ strlen(description
);
130 /* for now, only sec=krb5 and sec=mskrb5 are valid */
131 if (server
->secType
== Kerberos
)
132 sprintf(dp
, ";sec=krb5");
133 else if (server
->secType
== MSKerberos
)
134 sprintf(dp
, ";sec=mskrb5");
138 dp
= description
+ strlen(description
);
139 sprintf(dp
, ";uid=0x%x", sesInfo
->linux_uid
);
141 dp
= description
+ strlen(description
);
142 sprintf(dp
, ";user=%s", sesInfo
->userName
);
144 cFYI(1, ("key description = %s", description
));
145 spnego_key
= request_key(&cifs_spnego_key_type
, description
, "");
147 #ifdef CONFIG_CIFS_DEBUG2
148 if (cifsFYI
&& !IS_ERR(spnego_key
)) {
149 struct cifs_spnego_msg
*msg
= spnego_key
->payload
.data
;
150 cifs_dump_mem("SPNEGO reply blob:", msg
->data
, min(1024U,
151 msg
->secblob_len
+ msg
->sesskey_len
));
153 #endif /* CONFIG_CIFS_DEBUG2 */