blob: 6908080e9b6d889f323d21da24892046f7fd16a0 [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;
Silviu-Mihai Popescuf7f7c182013-03-11 18:22:32 +020040 payload = kmemdup(prep->data, prep->datalen, GFP_KERNEL);
Steve Frenchf1d662a2007-11-05 14:38:08 +000041 if (!payload)
42 goto error;
43
44 /* attach the data */
David Howells146aa8b2015-10-21 14:04:48 +010045 key->payload.data[0] = 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{
David Howells146aa8b2015-10-21 14:04:48 +010055 kfree(key->payload.data[0]);
Steve Frenchf1d662a2007-11-05 14:38:08 +000056}
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,
Steve Frenchf1d662a2007-11-05 14:38:08 +000065 .destroy = cifs_spnego_key_destroy,
66 .describe = user_describe,
67};
68
Steve French7c9c3762008-09-23 17:23:09 +000069/* length of longest version string e.g. strlen("ver=0xFF") */
70#define MAX_VER_STR_LEN 8
71
72/* length of longest security mechanism name, eg in future could have
73 * strlen(";sec=ntlmsspi") */
74#define MAX_MECH_STR_LEN 13
75
Steve French7c9c3762008-09-23 17:23:09 +000076/* strlen of "host=" */
77#define HOST_KEY_LEN 5
78
79/* strlen of ";ip4=" or ";ip6=" */
80#define IP_KEY_LEN 5
81
82/* strlen of ";uid=0x" */
83#define UID_KEY_LEN 7
84
Jeff Laytonba5dadb2010-08-03 10:19:50 -040085/* strlen of ";creduid=0x" */
86#define CREDUID_KEY_LEN 11
87
Steve French7c9c3762008-09-23 17:23:09 +000088/* strlen of ";user=" */
89#define USER_KEY_LEN 6
90
Jeff Laytonc4c1bff2009-07-09 20:02:48 -040091/* strlen of ";pid=0x" */
92#define PID_KEY_LEN 7
93
Steve Frenchf1d662a2007-11-05 14:38:08 +000094/* get a key struct with a SPNEGO security blob, suitable for session setup */
95struct key *
Steve French96daf2b2011-05-27 04:34:02 +000096cifs_get_spnego_key(struct cifs_ses *sesInfo)
Steve Frenchf1d662a2007-11-05 14:38:08 +000097{
98 struct TCP_Server_Info *server = sesInfo->server;
Pavel Shilovskya9f1b852010-12-13 19:08:35 +030099 struct sockaddr_in *sa = (struct sockaddr_in *) &server->dstaddr;
100 struct sockaddr_in6 *sa6 = (struct sockaddr_in6 *) &server->dstaddr;
Steve Frenchf1d662a2007-11-05 14:38:08 +0000101 char *description, *dp;
102 size_t desc_len;
103 struct key *spnego_key;
Jeff Laytond6c2e4d2007-11-16 22:23:17 +0000104 const char *hostname = server->hostname;
Steve Frenchf1d662a2007-11-05 14:38:08 +0000105
Jeff Layton66b8bd32008-08-01 17:54:32 +0000106 /* length of fields (with semicolons): ver=0xyz ip4=ipaddress
107 host=hostname sec=mechanism uid=0xFF user=username */
108 desc_len = MAX_VER_STR_LEN +
Steve French7c9c3762008-09-23 17:23:09 +0000109 HOST_KEY_LEN + strlen(hostname) +
Jeff Layton50b64e32009-06-02 06:55:20 -0400110 IP_KEY_LEN + INET6_ADDRSTRLEN +
Jeff Layton66b8bd32008-08-01 17:54:32 +0000111 MAX_MECH_STR_LEN +
Steve French7c9c3762008-09-23 17:23:09 +0000112 UID_KEY_LEN + (sizeof(uid_t) * 2) +
Jeff Laytonba5dadb2010-08-03 10:19:50 -0400113 CREDUID_KEY_LEN + (sizeof(uid_t) * 2) +
Jeff Laytonc4c1bff2009-07-09 20:02:48 -0400114 PID_KEY_LEN + (sizeof(pid_t) * 2) + 1;
Jeff Layton66b8bd32008-08-01 17:54:32 +0000115
Jeff Layton04febab2012-01-17 16:09:15 -0500116 if (sesInfo->user_name)
117 desc_len += USER_KEY_LEN + strlen(sesInfo->user_name);
118
Steve Frenchf1d662a2007-11-05 14:38:08 +0000119 spnego_key = ERR_PTR(-ENOMEM);
120 description = kzalloc(desc_len, GFP_KERNEL);
121 if (description == NULL)
122 goto out;
123
124 dp = description;
125 /* start with version and hostname portion of UNC string */
126 spnego_key = ERR_PTR(-EINVAL);
Steve French68bf7282007-11-16 18:32:52 +0000127 sprintf(dp, "ver=0x%x;host=%s;", CIFS_SPNEGO_UPCALL_VERSION,
Steve Frenchf1d662a2007-11-05 14:38:08 +0000128 hostname);
129 dp = description + strlen(description);
130
131 /* add the server address */
Pavel Shilovskya9f1b852010-12-13 19:08:35 +0300132 if (server->dstaddr.ss_family == AF_INET)
133 sprintf(dp, "ip4=%pI4", &sa->sin_addr);
134 else if (server->dstaddr.ss_family == AF_INET6)
135 sprintf(dp, "ip6=%pI6", &sa6->sin6_addr);
Steve Frenchf1d662a2007-11-05 14:38:08 +0000136 else
137 goto out;
138
139 dp = description + strlen(description);
140
Steve Frenchc16fefa2008-08-19 19:35:33 +0000141 /* for now, only sec=krb5 and sec=mskrb5 are valid */
Jeff Layton26efa0b2010-04-24 07:57:49 -0400142 if (server->sec_kerberos)
Steve Frenchf1d662a2007-11-05 14:38:08 +0000143 sprintf(dp, ";sec=krb5");
Jeff Layton26efa0b2010-04-24 07:57:49 -0400144 else if (server->sec_mskerberos)
Steve Frenchc16fefa2008-08-19 19:35:33 +0000145 sprintf(dp, ";sec=mskrb5");
Steve Frenchf1d662a2007-11-05 14:38:08 +0000146 else
147 goto out;
148
Igor Mammedov9eae8a82007-11-08 16:13:31 +0000149 dp = description + strlen(description);
Eric W. Biederman64ed39d2013-02-06 02:30:39 -0800150 sprintf(dp, ";uid=0x%x",
151 from_kuid_munged(&init_user_ns, sesInfo->linux_uid));
Igor Mammedov9eae8a82007-11-08 16:13:31 +0000152
Igor Mammedove4058242008-04-02 17:33:47 +0400153 dp = description + strlen(description);
Eric W. Biederman64ed39d2013-02-06 02:30:39 -0800154 sprintf(dp, ";creduid=0x%x",
155 from_kuid_munged(&init_user_ns, sesInfo->cred_uid));
Jeff Layton3e4b3e12010-07-19 18:00:17 -0400156
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 Perchesf96637b2013-05-04 22:12:25 -0500165 cifs_dbg(FYI, "key description = %s\n", 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)) {
David Howells146aa8b2015-10-21 14:04:48 +0100170 struct cifs_spnego_msg *msg = spnego_key->payload.data[0];
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}