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-rw-r--r--fs/cifs/cifs_spnego.c124
-rw-r--r--fs/cifs/cifs_spnego.h46
2 files changed, 170 insertions, 0 deletions
diff --git a/fs/cifs/cifs_spnego.c b/fs/cifs/cifs_spnego.c
new file mode 100644
index 000000000000..e142faf2d0ae
--- /dev/null
+++ b/fs/cifs/cifs_spnego.c
@@ -0,0 +1,124 @@
1/*
2 * fs/cifs/cifs_spnego.c -- SPNEGO upcall management for CIFS
3 *
4 * Copyright (c) 2007 Red Hat, Inc.
5 * Author(s): Jeff Layton (jlayton@redhat.com)
6 *
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.
11 *
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.
16 *
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
20 */
21
22#include <linux/list.h>
23#include <linux/string.h>
24#include <keys/user-type.h>
25#include <linux/key-type.h>
26#include "cifsglob.h"
27#include "cifs_spnego.h"
28#include "cifs_debug.h"
29
30/* create a new cifs key */
31static int
32cifs_spnego_key_instantiate(struct key *key, const void *data, size_t datalen)
33{
34 char *payload;
35 int ret;
36
37 ret = -ENOMEM;
38 payload = kmalloc(datalen, GFP_KERNEL);
39 if (!payload)
40 goto error;
41
42 /* attach the data */
43 memcpy(payload, data, datalen);
44 rcu_assign_pointer(key->payload.data, payload);
45 ret = 0;
46
47error:
48 return ret;
49}
50
51static void
52cifs_spnego_key_destroy(struct key *key)
53{
54 kfree(key->payload.data);
55}
56
57
58/*
59 * keytype for CIFS spnego keys
60 */
61struct key_type cifs_spnego_key_type = {
62 .name = "cifs.spnego",
63 .instantiate = cifs_spnego_key_instantiate,
64 .match = user_match,
65 .destroy = cifs_spnego_key_destroy,
66 .describe = user_describe,
67};
68
69/* get a key struct with a SPNEGO security blob, suitable for session setup */
70struct key *
71cifs_get_spnego_key(struct cifsSesInfo *sesInfo, const char *hostname)
72{
73 struct TCP_Server_Info *server = sesInfo->server;
74 char *description, *dp;
75 size_t desc_len;
76 struct key *spnego_key;
77
78
79 /* version + ;ip{4|6}= + address + ;host=hostname + ;sec= + NULL */
80 desc_len = 2 + 5 + 32 + 1 + 5 + strlen(hostname) +
81 strlen(";sec=krb5") + 1;
82 spnego_key = ERR_PTR(-ENOMEM);
83 description = kzalloc(desc_len, GFP_KERNEL);
84 if (description == NULL)
85 goto out;
86
87 dp = description;
88 /* start with version and hostname portion of UNC string */
89 spnego_key = ERR_PTR(-EINVAL);
90 sprintf(dp, "%2.2x;host=%s;", CIFS_SPNEGO_UPCALL_VERSION,
91 hostname);
92 dp = description + strlen(description);
93
94 /* add the server address */
95 if (server->addr.sockAddr.sin_family == AF_INET)
96 sprintf(dp, "ip4=" NIPQUAD_FMT,
97 NIPQUAD(server->addr.sockAddr.sin_addr));
98 else if (server->addr.sockAddr.sin_family == AF_INET6)
99 sprintf(dp, "ip6=" NIP6_SEQFMT,
100 NIP6(server->addr.sockAddr6.sin6_addr));
101 else
102 goto out;
103
104 dp = description + strlen(description);
105
106 /* for now, only sec=krb5 is valid */
107 if (server->secType == Kerberos)
108 sprintf(dp, ";sec=krb5");
109 else
110 goto out;
111
112 cFYI(1, ("key description = %s", description));
113 spnego_key = request_key(&cifs_spnego_key_type, description, "");
114
115 if (cifsFYI && !IS_ERR(spnego_key)) {
116 struct cifs_spnego_msg *msg = spnego_key->payload.data;
117 cifs_dump_mem("SPNEGO reply blob:", msg->data,
118 msg->secblob_len + msg->sesskey_len);
119 }
120
121out:
122 kfree(description);
123 return spnego_key;
124}
diff --git a/fs/cifs/cifs_spnego.h b/fs/cifs/cifs_spnego.h
new file mode 100644
index 000000000000..f443f3b35134
--- /dev/null
+++ b/fs/cifs/cifs_spnego.h
@@ -0,0 +1,46 @@
1/*
2 * fs/cifs/cifs_spnego.h -- SPNEGO upcall management for CIFS
3 *
4 * Copyright (c) 2007 Red Hat, Inc.
5 * Author(s): Jeff Layton (jlayton@redhat.com)
6 * Steve French (sfrench@us.ibm.com)
7 *
8 * This library is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU Lesser General Public License as published
10 * by the Free Software Foundation; either version 2.1 of the License, or
11 * (at your option) any later version.
12 *
13 * This library is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
16 * the GNU Lesser General Public License for more details.
17 *
18 * You should have received a copy of the GNU Lesser General Public License
19 * along with this library; if not, write to the Free Software
20 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
21 */
22
23#ifndef _CIFS_SPNEGO_H
24#define _CIFS_SPNEGO_H
25
26#define CIFS_SPNEGO_UPCALL_VERSION 1
27
28/*
29 * The version field should always be set to CIFS_SPNEGO_UPCALL_VERSION.
30 * The flags field is for future use. The request-key callout should set
31 * sesskey_len and secblob_len, and then concatenate the SessKey+SecBlob
32 * and stuff it in the data field.
33 */
34struct cifs_spnego_msg {
35 uint32_t version;
36 uint32_t flags;
37 uint32_t sesskey_len;
38 uint32_t secblob_len;
39 uint8_t data[1];
40};
41
42#ifdef __KERNEL__
43extern struct key_type cifs_spnego_key_type;
44#endif /* KERNEL */
45
46#endif /* _CIFS_SPNEGO_H */
generated by cgit v1.2.2 (git 2.25.0) at 2024-12-21 20:01:17 -0500