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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 "cifsglob.h" | |
27 | #include "cifs_spnego.h" | |
28 | #include "cifs_debug.h" | |
29 | ||
30 | /* create a new cifs key */ | |
31 | static int | |
32 | cifs_spnego_key_instantiate(struct key *key, const void *data, size_t datalen) | |
33 | { | |
34 | char *payload; | |
35 | int ret; | |
36 | ||
37 | ret = -ENOMEM; | |
38 | payload = kmalloc(datalen, GFP_KERNEL); | |
39 | if (!payload) | |
40 | goto error; | |
41 | ||
42 | /* attach the data */ | |
43 | memcpy(payload, data, datalen); | |
44 | key->payload.data = payload; | |
45 | ret = 0; | |
46 | ||
47 | error: | |
48 | return ret; | |
49 | } | |
50 | ||
51 | static void | |
52 | cifs_spnego_key_destroy(struct key *key) | |
53 | { | |
54 | kfree(key->payload.data); | |
55 | } | |
56 | ||
57 | ||
58 | /* | |
59 | * keytype for CIFS spnego keys | |
60 | */ | |
61 | struct key_type cifs_spnego_key_type = { | |
62 | .name = "cifs.spnego", | |
63 | .instantiate = cifs_spnego_key_instantiate, | |
64 | .match = user_match, | |
65 | .destroy = cifs_spnego_key_destroy, | |
66 | .describe = user_describe, | |
67 | }; | |
68 | ||
69 | /* 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 | ||
76 | /* max possible addr len eg FEDC:BA98:7654:3210:FEDC:BA98:7654:3210/128 */ | |
77 | #define MAX_IPV6_ADDR_LEN 43 | |
78 | ||
79 | /* strlen of "host=" */ | |
80 | #define HOST_KEY_LEN 5 | |
81 | ||
82 | /* strlen of ";ip4=" or ";ip6=" */ | |
83 | #define IP_KEY_LEN 5 | |
84 | ||
85 | /* strlen of ";uid=0x" */ | |
86 | #define UID_KEY_LEN 7 | |
87 | ||
88 | /* strlen of ";user=" */ | |
89 | #define USER_KEY_LEN 6 | |
90 | ||
91 | /* get a key struct with a SPNEGO security blob, suitable for session setup */ | |
92 | struct key * | |
93 | cifs_get_spnego_key(struct cifsSesInfo *sesInfo) | |
94 | { | |
95 | struct TCP_Server_Info *server = sesInfo->server; | |
96 | char *description, *dp; | |
97 | size_t desc_len; | |
98 | struct key *spnego_key; | |
99 | const char *hostname = server->hostname; | |
100 | ||
101 | /* length of fields (with semicolons): ver=0xyz ip4=ipaddress | |
102 | host=hostname sec=mechanism uid=0xFF user=username */ | |
103 | desc_len = MAX_VER_STR_LEN + | |
104 | HOST_KEY_LEN + strlen(hostname) + | |
105 | IP_KEY_LEN + MAX_IPV6_ADDR_LEN + | |
106 | MAX_MECH_STR_LEN + | |
107 | UID_KEY_LEN + (sizeof(uid_t) * 2) + | |
108 | USER_KEY_LEN + strlen(sesInfo->userName) + 1; | |
109 | ||
110 | spnego_key = ERR_PTR(-ENOMEM); | |
111 | description = kzalloc(desc_len, GFP_KERNEL); | |
112 | if (description == NULL) | |
113 | goto out; | |
114 | ||
115 | dp = description; | |
116 | /* start with version and hostname portion of UNC string */ | |
117 | spnego_key = ERR_PTR(-EINVAL); | |
118 | sprintf(dp, "ver=0x%x;host=%s;", CIFS_SPNEGO_UPCALL_VERSION, | |
119 | hostname); | |
120 | dp = description + strlen(description); | |
121 | ||
122 | /* add the server address */ | |
123 | if (server->addr.sockAddr.sin_family == AF_INET) | |
124 | sprintf(dp, "ip4=%pI4", &server->addr.sockAddr.sin_addr); | |
125 | else if (server->addr.sockAddr.sin_family == AF_INET6) | |
126 | sprintf(dp, "ip6=%pi6", &server->addr.sockAddr6.sin6_addr); | |
127 | else | |
128 | goto out; | |
129 | ||
130 | dp = description + strlen(description); | |
131 | ||
132 | /* for now, only sec=krb5 and sec=mskrb5 are valid */ | |
133 | if (server->secType == Kerberos) | |
134 | sprintf(dp, ";sec=krb5"); | |
135 | else if (server->secType == MSKerberos) | |
136 | sprintf(dp, ";sec=mskrb5"); | |
137 | else | |
138 | goto out; | |
139 | ||
140 | dp = description + strlen(description); | |
141 | sprintf(dp, ";uid=0x%x", sesInfo->linux_uid); | |
142 | ||
143 | dp = description + strlen(description); | |
144 | sprintf(dp, ";user=%s", sesInfo->userName); | |
145 | ||
146 | cFYI(1, ("key description = %s", description)); | |
147 | spnego_key = request_key(&cifs_spnego_key_type, description, ""); | |
148 | ||
149 | #ifdef CONFIG_CIFS_DEBUG2 | |
150 | if (cifsFYI && !IS_ERR(spnego_key)) { | |
151 | struct cifs_spnego_msg *msg = spnego_key->payload.data; | |
152 | cifs_dump_mem("SPNEGO reply blob:", msg->data, min(1024U, | |
153 | msg->secblob_len + msg->sesskey_len)); | |
154 | } | |
155 | #endif /* CONFIG_CIFS_DEBUG2 */ | |
156 | ||
157 | out: | |
158 | kfree(description); | |
159 | return spnego_key; | |
160 | } |