blob: 086f381d648954c4001542be40b3ba6beffbceb0 [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
David Howellscf7f6012012-09-13 13:06:29 +010034cifs_spnego_key_instantiate(struct key *key, struct key_preparsed_payload *prep)
Steve Frenchf1d662a2007-11-05 14:38:08 +000035{
36 char *payload;
37 int ret;
38
39 ret = -ENOMEM;
David Howellscf7f6012012-09-13 13:06:29 +010040 payload = kmalloc(prep->datalen, GFP_KERNEL);
Steve Frenchf1d662a2007-11-05 14:38:08 +000041 if (!payload)
42 goto error;
43
44 /* attach the data */
David Howellscf7f6012012-09-13 13:06:29 +010045 memcpy(payload, prep->data, prep->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
Jeff Laytonba5dadb2010-08-03 10:19:50 -040087/* strlen of ";creduid=0x" */
88#define CREDUID_KEY_LEN 11
89
Steve French7c9c3762008-09-23 17:23:09 +000090/* strlen of ";user=" */
91#define USER_KEY_LEN 6
92
Jeff Laytonc4c1bff2009-07-09 20:02:48 -040093/* strlen of ";pid=0x" */
94#define PID_KEY_LEN 7
95
Steve Frenchf1d662a2007-11-05 14:38:08 +000096/* get a key struct with a SPNEGO security blob, suitable for session setup */
97struct key *
Steve French96daf2b2011-05-27 04:34:02 +000098cifs_get_spnego_key(struct cifs_ses *sesInfo)
Steve Frenchf1d662a2007-11-05 14:38:08 +000099{
100 struct TCP_Server_Info *server = sesInfo->server;
Pavel Shilovskya9f1b852010-12-13 19:08:35 +0300101 struct sockaddr_in *sa = (struct sockaddr_in *) &server->dstaddr;
102 struct sockaddr_in6 *sa6 = (struct sockaddr_in6 *) &server->dstaddr;
Steve Frenchf1d662a2007-11-05 14:38:08 +0000103 char *description, *dp;
104 size_t desc_len;
105 struct key *spnego_key;
Jeff Laytond6c2e4d2007-11-16 22:23:17 +0000106 const char *hostname = server->hostname;
Steve Frenchf1d662a2007-11-05 14:38:08 +0000107
Jeff Layton66b8bd32008-08-01 17:54:32 +0000108 /* length of fields (with semicolons): ver=0xyz ip4=ipaddress
109 host=hostname sec=mechanism uid=0xFF user=username */
110 desc_len = MAX_VER_STR_LEN +
Steve French7c9c3762008-09-23 17:23:09 +0000111 HOST_KEY_LEN + strlen(hostname) +
Jeff Layton50b64e32009-06-02 06:55:20 -0400112 IP_KEY_LEN + INET6_ADDRSTRLEN +
Jeff Layton66b8bd32008-08-01 17:54:32 +0000113 MAX_MECH_STR_LEN +
Steve French7c9c3762008-09-23 17:23:09 +0000114 UID_KEY_LEN + (sizeof(uid_t) * 2) +
Jeff Laytonba5dadb2010-08-03 10:19:50 -0400115 CREDUID_KEY_LEN + (sizeof(uid_t) * 2) +
Jeff Laytonc4c1bff2009-07-09 20:02:48 -0400116 PID_KEY_LEN + (sizeof(pid_t) * 2) + 1;
Jeff Layton66b8bd32008-08-01 17:54:32 +0000117
Jeff Layton04febab2012-01-17 16:09:15 -0500118 if (sesInfo->user_name)
119 desc_len += USER_KEY_LEN + strlen(sesInfo->user_name);
120
Steve Frenchf1d662a2007-11-05 14:38:08 +0000121 spnego_key = ERR_PTR(-ENOMEM);
122 description = kzalloc(desc_len, GFP_KERNEL);
123 if (description == NULL)
124 goto out;
125
126 dp = description;
127 /* start with version and hostname portion of UNC string */
128 spnego_key = ERR_PTR(-EINVAL);
Steve French68bf7282007-11-16 18:32:52 +0000129 sprintf(dp, "ver=0x%x;host=%s;", CIFS_SPNEGO_UPCALL_VERSION,
Steve Frenchf1d662a2007-11-05 14:38:08 +0000130 hostname);
131 dp = description + strlen(description);
132
133 /* add the server address */
Pavel Shilovskya9f1b852010-12-13 19:08:35 +0300134 if (server->dstaddr.ss_family == AF_INET)
135 sprintf(dp, "ip4=%pI4", &sa->sin_addr);
136 else if (server->dstaddr.ss_family == AF_INET6)
137 sprintf(dp, "ip6=%pI6", &sa6->sin6_addr);
Steve Frenchf1d662a2007-11-05 14:38:08 +0000138 else
139 goto out;
140
141 dp = description + strlen(description);
142
Steve Frenchc16fefa2008-08-19 19:35:33 +0000143 /* for now, only sec=krb5 and sec=mskrb5 are valid */
Jeff Layton26efa0b2010-04-24 07:57:49 -0400144 if (server->sec_kerberos)
Steve Frenchf1d662a2007-11-05 14:38:08 +0000145 sprintf(dp, ";sec=krb5");
Jeff Layton26efa0b2010-04-24 07:57:49 -0400146 else if (server->sec_mskerberos)
Steve Frenchc16fefa2008-08-19 19:35:33 +0000147 sprintf(dp, ";sec=mskrb5");
Steve Frenchf1d662a2007-11-05 14:38:08 +0000148 else
149 goto out;
150
Igor Mammedov9eae8a82007-11-08 16:13:31 +0000151 dp = description + strlen(description);
152 sprintf(dp, ";uid=0x%x", sesInfo->linux_uid);
153
Igor Mammedove4058242008-04-02 17:33:47 +0400154 dp = description + strlen(description);
Jeff Layton3e4b3e12010-07-19 18:00:17 -0400155 sprintf(dp, ";creduid=0x%x", sesInfo->cred_uid);
156
Jeff Layton04febab2012-01-17 16:09:15 -0500157 if (sesInfo->user_name) {
158 dp = description + strlen(description);
159 sprintf(dp, ";user=%s", sesInfo->user_name);
160 }
Igor Mammedove4058242008-04-02 17:33:47 +0400161
Jeff Laytonc4c1bff2009-07-09 20:02:48 -0400162 dp = description + strlen(description);
163 sprintf(dp, ";pid=0x%x", current->pid);
164
Joe Perchesb6b38f72010-04-21 03:50:45 +0000165 cFYI(1, "key description = %s", description);
Steve Frenchf1d662a2007-11-05 14:38:08 +0000166 spnego_key = request_key(&cifs_spnego_key_type, description, "");
167
Jeff Layton05b3de62007-12-31 00:51:45 +0000168#ifdef CONFIG_CIFS_DEBUG2
Steve Frenchf1d662a2007-11-05 14:38:08 +0000169 if (cifsFYI && !IS_ERR(spnego_key)) {
170 struct cifs_spnego_msg *msg = spnego_key->payload.data;
Andrew Mortonead03e32008-02-05 15:51:24 +0000171 cifs_dump_mem("SPNEGO reply blob:", msg->data, min(1024U,
Jeff Layton05b3de62007-12-31 00:51:45 +0000172 msg->secblob_len + msg->sesskey_len));
Steve Frenchf1d662a2007-11-05 14:38:08 +0000173 }
Jeff Layton05b3de62007-12-31 00:51:45 +0000174#endif /* CONFIG_CIFS_DEBUG2 */
Steve Frenchf1d662a2007-11-05 14:38:08 +0000175
176out:
177 kfree(description);
178 return spnego_key;
179}