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 <linux/inet.h>
27 #include "cifsglob.h"
28 #include "cifs_spnego.h"
29 #include "cifs_debug.h"
30
31 /* create a new cifs key */
32 static int
33 cifs_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);
45 key->payload.data = payload;
46 ret = 0;
47
48 error:
49 return ret;
50 }
51
52 static void
53 cifs_spnego_key_destroy(struct key *key)
54 {
55 kfree(key->payload.data);
56 }
57
58
59 /*
60 * keytype for CIFS spnego keys
61 */
62 struct 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
70 /* 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
77 /* 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
89 /* strlen of ";pid=0x" */
90 #define PID_KEY_LEN 7
91
92 /* get a key struct with a SPNEGO security blob, suitable for session setup */
93 struct key *
94 cifs_get_spnego_key(struct cifsSesInfo *sesInfo)
95 {
96 struct TCP_Server_Info *server = sesInfo->server;
97 char *description, *dp;
98 size_t desc_len;
99 struct key *spnego_key;
100 const char *hostname = server->hostname;
101
102 /* 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 +
105 HOST_KEY_LEN + strlen(hostname) +
106 IP_KEY_LEN + INET6_ADDRSTRLEN +
107 MAX_MECH_STR_LEN +
108 UID_KEY_LEN + (sizeof(uid_t) * 2) +
109 USER_KEY_LEN + strlen(sesInfo->userName) +
110 PID_KEY_LEN + (sizeof(pid_t) * 2) + 1;
111
112 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);
120 sprintf(dp, "ver=0x%x;host=%s;", CIFS_SPNEGO_UPCALL_VERSION,
121 hostname);
122 dp = description + strlen(description);
123
124 /* add the server address */
125 if (server->addr.sockAddr.sin_family == AF_INET)
126 sprintf(dp, "ip4=%pI4", &server->addr.sockAddr.sin_addr);
127 else if (server->addr.sockAddr.sin_family == AF_INET6)
128 sprintf(dp, "ip6=%pi6", &server->addr.sockAddr6.sin6_addr);
129 else
130 goto out;
131
132 dp = description + strlen(description);
133
134 /* for now, only sec=krb5 and sec=mskrb5 are valid */
135 if (server->secType == Kerberos)
136 sprintf(dp, ";sec=krb5");
137 else if (server->secType == MSKerberos)
138 sprintf(dp, ";sec=mskrb5");
139 else
140 goto out;
141
142 dp = description + strlen(description);
143 sprintf(dp, ";uid=0x%x", sesInfo->linux_uid);
144
145 dp = description + strlen(description);
146 sprintf(dp, ";user=%s", sesInfo->userName);
147
148 dp = description + strlen(description);
149 sprintf(dp, ";pid=0x%x", current->pid);
150
151 cFYI(1, ("key description = %s", description));
152 spnego_key = request_key(&cifs_spnego_key_type, description, "");
153
154 #ifdef CONFIG_CIFS_DEBUG2
155 if (cifsFYI && !IS_ERR(spnego_key)) {
156 struct cifs_spnego_msg *msg = spnego_key->payload.data;
157 cifs_dump_mem("SPNEGO reply blob:", msg->data, min(1024U,
158 msg->secblob_len + msg->sesskey_len));
159 }
160 #endif /* CONFIG_CIFS_DEBUG2 */
161
162 out:
163 kfree(description);
164 return spnego_key;
165 }
166
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