blob: 8ec7736ce954cd63cbe7a1cea7c368d248ad20ba [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>
23#include <linux/string.h>
24#include <keys/user-type.h>
25#include <linux/key-type.h>
Jeff Layton50b64e32009-06-02 06:55:20 -040026#include <linux/inet.h>
Steve Frenchf1d662a2007-11-05 14:38:08 +000027#include "cifsglob.h"
28#include "cifs_spnego.h"
29#include "cifs_debug.h"
30
31/* create a new cifs key */
32static int
33cifs_spnego_key_instantiate(struct key *key, const void *data, size_t datalen)
34{
35 char *payload;
36 int ret;
37
38 ret = -ENOMEM;
39 payload = kmalloc(datalen, GFP_KERNEL);
40 if (!payload)
41 goto error;
42
43 /* attach the data */
44 memcpy(payload, data, datalen);
Jeff Laytond9fb5c02009-03-23 01:47:11 -040045 key->payload.data = payload;
Steve Frenchf1d662a2007-11-05 14:38:08 +000046 ret = 0;
47
48error:
49 return ret;
50}
51
52static void
53cifs_spnego_key_destroy(struct key *key)
54{
55 kfree(key->payload.data);
56}
57
58
59/*
60 * keytype for CIFS spnego keys
61 */
62struct key_type cifs_spnego_key_type = {
63 .name = "cifs.spnego",
64 .instantiate = cifs_spnego_key_instantiate,
65 .match = user_match,
66 .destroy = cifs_spnego_key_destroy,
67 .describe = user_describe,
68};
69
Steve French7c9c3762008-09-23 17:23:09 +000070/* length of longest version string e.g. strlen("ver=0xFF") */
71#define MAX_VER_STR_LEN 8
72
73/* length of longest security mechanism name, eg in future could have
74 * strlen(";sec=ntlmsspi") */
75#define MAX_MECH_STR_LEN 13
76
Steve French7c9c3762008-09-23 17:23:09 +000077/* strlen of "host=" */
78#define HOST_KEY_LEN 5
79
80/* strlen of ";ip4=" or ";ip6=" */
81#define IP_KEY_LEN 5
82
83/* strlen of ";uid=0x" */
84#define UID_KEY_LEN 7
85
86/* strlen of ";user=" */
87#define USER_KEY_LEN 6
88
Jeff Laytonc4c1bff2009-07-09 20:02:48 -040089/* strlen of ";pid=0x" */
90#define PID_KEY_LEN 7
91
Steve Frenchf1d662a2007-11-05 14:38:08 +000092/* get a key struct with a SPNEGO security blob, suitable for session setup */
93struct key *
Jeff Laytond6c2e4d2007-11-16 22:23:17 +000094cifs_get_spnego_key(struct cifsSesInfo *sesInfo)
Steve Frenchf1d662a2007-11-05 14:38:08 +000095{
96 struct TCP_Server_Info *server = sesInfo->server;
97 char *description, *dp;
98 size_t desc_len;
99 struct key *spnego_key;
Jeff Laytond6c2e4d2007-11-16 22:23:17 +0000100 const char *hostname = server->hostname;
Steve Frenchf1d662a2007-11-05 14:38:08 +0000101
Jeff Layton66b8bd32008-08-01 17:54:32 +0000102 /* length of fields (with semicolons): ver=0xyz ip4=ipaddress
103 host=hostname sec=mechanism uid=0xFF user=username */
104 desc_len = MAX_VER_STR_LEN +
Steve French7c9c3762008-09-23 17:23:09 +0000105 HOST_KEY_LEN + strlen(hostname) +
Jeff Layton50b64e32009-06-02 06:55:20 -0400106 IP_KEY_LEN + INET6_ADDRSTRLEN +
Jeff Layton66b8bd32008-08-01 17:54:32 +0000107 MAX_MECH_STR_LEN +
Steve French7c9c3762008-09-23 17:23:09 +0000108 UID_KEY_LEN + (sizeof(uid_t) * 2) +
Jeff Laytonc4c1bff2009-07-09 20:02:48 -0400109 USER_KEY_LEN + strlen(sesInfo->userName) +
110 PID_KEY_LEN + (sizeof(pid_t) * 2) + 1;
Jeff Layton66b8bd32008-08-01 17:54:32 +0000111
Steve Frenchf1d662a2007-11-05 14:38:08 +0000112 spnego_key = ERR_PTR(-ENOMEM);
113 description = kzalloc(desc_len, GFP_KERNEL);
114 if (description == NULL)
115 goto out;
116
117 dp = description;
118 /* start with version and hostname portion of UNC string */
119 spnego_key = ERR_PTR(-EINVAL);
Steve French68bf7282007-11-16 18:32:52 +0000120 sprintf(dp, "ver=0x%x;host=%s;", CIFS_SPNEGO_UPCALL_VERSION,
Steve Frenchf1d662a2007-11-05 14:38:08 +0000121 hostname);
122 dp = description + strlen(description);
123
124 /* add the server address */
125 if (server->addr.sockAddr.sin_family == AF_INET)
Harvey Harrisonbe859402008-10-31 00:56:28 -0700126 sprintf(dp, "ip4=%pI4", &server->addr.sockAddr.sin_addr);
Steve Frenchf1d662a2007-11-05 14:38:08 +0000127 else if (server->addr.sockAddr.sin_family == AF_INET6)
Jeff Layton8c58b542009-08-17 16:26:49 -0400128 sprintf(dp, "ip6=%pI6", &server->addr.sockAddr6.sin6_addr);
Steve Frenchf1d662a2007-11-05 14:38:08 +0000129 else
130 goto out;
131
132 dp = description + strlen(description);
133
Steve Frenchc16fefa2008-08-19 19:35:33 +0000134 /* for now, only sec=krb5 and sec=mskrb5 are valid */
Steve Frenchf1d662a2007-11-05 14:38:08 +0000135 if (server->secType == Kerberos)
136 sprintf(dp, ";sec=krb5");
Steve Frenchc16fefa2008-08-19 19:35:33 +0000137 else if (server->secType == MSKerberos)
138 sprintf(dp, ";sec=mskrb5");
Steve Frenchf1d662a2007-11-05 14:38:08 +0000139 else
140 goto out;
141
Igor Mammedov9eae8a82007-11-08 16:13:31 +0000142 dp = description + strlen(description);
143 sprintf(dp, ";uid=0x%x", sesInfo->linux_uid);
144
Igor Mammedove4058242008-04-02 17:33:47 +0400145 dp = description + strlen(description);
146 sprintf(dp, ";user=%s", sesInfo->userName);
147
Jeff Laytonc4c1bff2009-07-09 20:02:48 -0400148 dp = description + strlen(description);
149 sprintf(dp, ";pid=0x%x", current->pid);
150
Steve Frenchf1d662a2007-11-05 14:38:08 +0000151 cFYI(1, ("key description = %s", description));
152 spnego_key = request_key(&cifs_spnego_key_type, description, "");
153
Jeff Layton05b3de62007-12-31 00:51:45 +0000154#ifdef CONFIG_CIFS_DEBUG2
Steve Frenchf1d662a2007-11-05 14:38:08 +0000155 if (cifsFYI && !IS_ERR(spnego_key)) {
156 struct cifs_spnego_msg *msg = spnego_key->payload.data;
Andrew Mortonead03e32008-02-05 15:51:24 +0000157 cifs_dump_mem("SPNEGO reply blob:", msg->data, min(1024U,
Jeff Layton05b3de62007-12-31 00:51:45 +0000158 msg->secblob_len + msg->sesskey_len));
Steve Frenchf1d662a2007-11-05 14:38:08 +0000159 }
Jeff Layton05b3de62007-12-31 00:51:45 +0000160#endif /* CONFIG_CIFS_DEBUG2 */
Steve Frenchf1d662a2007-11-05 14:38:08 +0000161
162out:
163 kfree(description);
164 return spnego_key;
165}