blob: 310d12f69a921c8817decd5198105dbde851d015 [file] [log] [blame]
Steve Frenchf1d662a2007-11-05 14:38:08 +00001/*
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>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090023#include <linux/slab.h>
Steve Frenchf1d662a2007-11-05 14:38:08 +000024#include <linux/string.h>
25#include <keys/user-type.h>
26#include <linux/key-type.h>
Jeff Layton50b64e32009-06-02 06:55:20 -040027#include <linux/inet.h>
Steve Frenchf1d662a2007-11-05 14:38:08 +000028#include "cifsglob.h"
29#include "cifs_spnego.h"
30#include "cifs_debug.h"
31
32/* create a new cifs key */
33static int
34cifs_spnego_key_instantiate(struct key *key, const void *data, size_t datalen)
35{
36 char *payload;
37 int ret;
38
39 ret = -ENOMEM;
40 payload = kmalloc(datalen, GFP_KERNEL);
41 if (!payload)
42 goto error;
43
44 /* attach the data */
45 memcpy(payload, data, datalen);
Jeff Laytond9fb5c02009-03-23 01:47:11 -040046 key->payload.data = payload;
Steve Frenchf1d662a2007-11-05 14:38:08 +000047 ret = 0;
48
49error:
50 return ret;
51}
52
53static void
54cifs_spnego_key_destroy(struct key *key)
55{
56 kfree(key->payload.data);
57}
58
59
60/*
61 * keytype for CIFS spnego keys
62 */
63struct key_type cifs_spnego_key_type = {
64 .name = "cifs.spnego",
65 .instantiate = cifs_spnego_key_instantiate,
66 .match = user_match,
67 .destroy = cifs_spnego_key_destroy,
68 .describe = user_describe,
69};
70
Steve French7c9c3762008-09-23 17:23:09 +000071/* length of longest version string e.g. strlen("ver=0xFF") */
72#define MAX_VER_STR_LEN 8
73
74/* length of longest security mechanism name, eg in future could have
75 * strlen(";sec=ntlmsspi") */
76#define MAX_MECH_STR_LEN 13
77
Steve French7c9c3762008-09-23 17:23:09 +000078/* strlen of "host=" */
79#define HOST_KEY_LEN 5
80
81/* strlen of ";ip4=" or ";ip6=" */
82#define IP_KEY_LEN 5
83
84/* strlen of ";uid=0x" */
85#define UID_KEY_LEN 7
86
87/* strlen of ";user=" */
88#define USER_KEY_LEN 6
89
Jeff Laytonc4c1bff2009-07-09 20:02:48 -040090/* strlen of ";pid=0x" */
91#define PID_KEY_LEN 7
92
Steve Frenchf1d662a2007-11-05 14:38:08 +000093/* get a key struct with a SPNEGO security blob, suitable for session setup */
94struct key *
Jeff Laytond6c2e4d2007-11-16 22:23:17 +000095cifs_get_spnego_key(struct cifsSesInfo *sesInfo)
Steve Frenchf1d662a2007-11-05 14:38:08 +000096{
97 struct TCP_Server_Info *server = sesInfo->server;
98 char *description, *dp;
99 size_t desc_len;
100 struct key *spnego_key;
Jeff Laytond6c2e4d2007-11-16 22:23:17 +0000101 const char *hostname = server->hostname;
Steve Frenchf1d662a2007-11-05 14:38:08 +0000102
Jeff Layton66b8bd32008-08-01 17:54:32 +0000103 /* length of fields (with semicolons): ver=0xyz ip4=ipaddress
104 host=hostname sec=mechanism uid=0xFF user=username */
105 desc_len = MAX_VER_STR_LEN +
Steve French7c9c3762008-09-23 17:23:09 +0000106 HOST_KEY_LEN + strlen(hostname) +
Jeff Layton50b64e32009-06-02 06:55:20 -0400107 IP_KEY_LEN + INET6_ADDRSTRLEN +
Jeff Layton66b8bd32008-08-01 17:54:32 +0000108 MAX_MECH_STR_LEN +
Steve French7c9c3762008-09-23 17:23:09 +0000109 UID_KEY_LEN + (sizeof(uid_t) * 2) +
Jeff Laytonc4c1bff2009-07-09 20:02:48 -0400110 USER_KEY_LEN + strlen(sesInfo->userName) +
111 PID_KEY_LEN + (sizeof(pid_t) * 2) + 1;
Jeff Layton66b8bd32008-08-01 17:54:32 +0000112
Steve Frenchf1d662a2007-11-05 14:38:08 +0000113 spnego_key = ERR_PTR(-ENOMEM);
114 description = kzalloc(desc_len, GFP_KERNEL);
115 if (description == NULL)
116 goto out;
117
118 dp = description;
119 /* start with version and hostname portion of UNC string */
120 spnego_key = ERR_PTR(-EINVAL);
Steve French68bf7282007-11-16 18:32:52 +0000121 sprintf(dp, "ver=0x%x;host=%s;", CIFS_SPNEGO_UPCALL_VERSION,
Steve Frenchf1d662a2007-11-05 14:38:08 +0000122 hostname);
123 dp = description + strlen(description);
124
125 /* add the server address */
126 if (server->addr.sockAddr.sin_family == AF_INET)
Harvey Harrisonbe859402008-10-31 00:56:28 -0700127 sprintf(dp, "ip4=%pI4", &server->addr.sockAddr.sin_addr);
Steve Frenchf1d662a2007-11-05 14:38:08 +0000128 else if (server->addr.sockAddr.sin_family == AF_INET6)
Jeff Layton8c58b542009-08-17 16:26:49 -0400129 sprintf(dp, "ip6=%pI6", &server->addr.sockAddr6.sin6_addr);
Steve Frenchf1d662a2007-11-05 14:38:08 +0000130 else
131 goto out;
132
133 dp = description + strlen(description);
134
Steve Frenchc16fefa2008-08-19 19:35:33 +0000135 /* for now, only sec=krb5 and sec=mskrb5 are valid */
Steve Frenchf1d662a2007-11-05 14:38:08 +0000136 if (server->secType == Kerberos)
137 sprintf(dp, ";sec=krb5");
Steve Frenchc16fefa2008-08-19 19:35:33 +0000138 else if (server->secType == MSKerberos)
139 sprintf(dp, ";sec=mskrb5");
Steve Frenchf1d662a2007-11-05 14:38:08 +0000140 else
141 goto out;
142
Igor Mammedov9eae8a82007-11-08 16:13:31 +0000143 dp = description + strlen(description);
144 sprintf(dp, ";uid=0x%x", sesInfo->linux_uid);
145
Igor Mammedove4058242008-04-02 17:33:47 +0400146 dp = description + strlen(description);
147 sprintf(dp, ";user=%s", sesInfo->userName);
148
Jeff Laytonc4c1bff2009-07-09 20:02:48 -0400149 dp = description + strlen(description);
150 sprintf(dp, ";pid=0x%x", current->pid);
151
Steve Frenchf1d662a2007-11-05 14:38:08 +0000152 cFYI(1, ("key description = %s", description));
153 spnego_key = request_key(&cifs_spnego_key_type, description, "");
154
Jeff Layton05b3de62007-12-31 00:51:45 +0000155#ifdef CONFIG_CIFS_DEBUG2
Steve Frenchf1d662a2007-11-05 14:38:08 +0000156 if (cifsFYI && !IS_ERR(spnego_key)) {
157 struct cifs_spnego_msg *msg = spnego_key->payload.data;
Andrew Mortonead03e32008-02-05 15:51:24 +0000158 cifs_dump_mem("SPNEGO reply blob:", msg->data, min(1024U,
Jeff Layton05b3de62007-12-31 00:51:45 +0000159 msg->secblob_len + msg->sesskey_len));
Steve Frenchf1d662a2007-11-05 14:38:08 +0000160 }
Jeff Layton05b3de62007-12-31 00:51:45 +0000161#endif /* CONFIG_CIFS_DEBUG2 */
Steve Frenchf1d662a2007-11-05 14:38:08 +0000162
163out:
164 kfree(description);
165 return spnego_key;
166}