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Linux/fs/cifs/cifs_spnego.c

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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/slab.h>
 24 #include <linux/string.h>
 25 #include <keys/user-type.h>
 26 #include <linux/key-type.h>
 27 #include <linux/keyctl.h>
 28 #include <linux/inet.h>
 29 #include "cifsglob.h"
 30 #include "cifs_spnego.h"
 31 #include "cifs_debug.h"
 32 #include "cifsproto.h"
 33 static const struct cred *spnego_cred;
 34 
 35 /* create a new cifs key */
 36 static int
 37 cifs_spnego_key_instantiate(struct key *key, struct key_preparsed_payload *prep)
 38 {
 39         char *payload;
 40         int ret;
 41 
 42         ret = -ENOMEM;
 43         payload = kmemdup(prep->data, prep->datalen, GFP_KERNEL);
 44         if (!payload)
 45                 goto error;
 46 
 47         /* attach the data */
 48         key->payload.data[0] = payload;
 49         ret = 0;
 50 
 51 error:
 52         return ret;
 53 }
 54 
 55 static void
 56 cifs_spnego_key_destroy(struct key *key)
 57 {
 58         kfree(key->payload.data[0]);
 59 }
 60 
 61 
 62 /*
 63  * keytype for CIFS spnego keys
 64  */
 65 struct key_type cifs_spnego_key_type = {
 66         .name           = "cifs.spnego",
 67         .instantiate    = cifs_spnego_key_instantiate,
 68         .destroy        = cifs_spnego_key_destroy,
 69         .describe       = user_describe,
 70 };
 71 
 72 /* length of longest version string e.g.  strlen("ver=0xFF") */
 73 #define MAX_VER_STR_LEN         8
 74 
 75 /* length of longest security mechanism name, eg in future could have
 76  * strlen(";sec=ntlmsspi") */
 77 #define MAX_MECH_STR_LEN        13
 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 ";creduid=0x" */
 89 #define CREDUID_KEY_LEN         11
 90 
 91 /* strlen of ";user=" */
 92 #define USER_KEY_LEN            6
 93 
 94 /* strlen of ";pid=0x" */
 95 #define PID_KEY_LEN             7
 96 
 97 /* get a key struct with a SPNEGO security blob, suitable for session setup */
 98 struct key *
 99 cifs_get_spnego_key(struct cifs_ses *sesInfo)
100 {
101         struct TCP_Server_Info *server = sesInfo->server;
102         struct sockaddr_in *sa = (struct sockaddr_in *) &server->dstaddr;
103         struct sockaddr_in6 *sa6 = (struct sockaddr_in6 *) &server->dstaddr;
104         char *description, *dp;
105         size_t desc_len;
106         struct key *spnego_key;
107         const char *hostname = server->hostname;
108         const struct cred *saved_cred;
109 
110         /* length of fields (with semicolons): ver=0xyz ip4=ipaddress
111            host=hostname sec=mechanism uid=0xFF user=username */
112         desc_len = MAX_VER_STR_LEN +
113                    HOST_KEY_LEN + strlen(hostname) +
114                    IP_KEY_LEN + INET6_ADDRSTRLEN +
115                    MAX_MECH_STR_LEN +
116                    UID_KEY_LEN + (sizeof(uid_t) * 2) +
117                    CREDUID_KEY_LEN + (sizeof(uid_t) * 2) +
118                    PID_KEY_LEN + (sizeof(pid_t) * 2) + 1;
119 
120         if (sesInfo->user_name)
121                 desc_len += USER_KEY_LEN + strlen(sesInfo->user_name);
122 
123         spnego_key = ERR_PTR(-ENOMEM);
124         description = kzalloc(desc_len, GFP_KERNEL);
125         if (description == NULL)
126                 goto out;
127 
128         dp = description;
129         /* start with version and hostname portion of UNC string */
130         spnego_key = ERR_PTR(-EINVAL);
131         sprintf(dp, "ver=0x%x;host=%s;", CIFS_SPNEGO_UPCALL_VERSION,
132                 hostname);
133         dp = description + strlen(description);
134 
135         /* add the server address */
136         if (server->dstaddr.ss_family == AF_INET)
137                 sprintf(dp, "ip4=%pI4", &sa->sin_addr);
138         else if (server->dstaddr.ss_family == AF_INET6)
139                 sprintf(dp, "ip6=%pI6", &sa6->sin6_addr);
140         else
141                 goto out;
142 
143         dp = description + strlen(description);
144 
145         /* for now, only sec=krb5 and sec=mskrb5 are valid */
146         if (server->sec_kerberos)
147                 sprintf(dp, ";sec=krb5");
148         else if (server->sec_mskerberos)
149                 sprintf(dp, ";sec=mskrb5");
150         else
151                 goto out;
152 
153         dp = description + strlen(description);
154         sprintf(dp, ";uid=0x%x",
155                 from_kuid_munged(&init_user_ns, sesInfo->linux_uid));
156 
157         dp = description + strlen(description);
158         sprintf(dp, ";creduid=0x%x",
159                 from_kuid_munged(&init_user_ns, sesInfo->cred_uid));
160 
161         if (sesInfo->user_name) {
162                 dp = description + strlen(description);
163                 sprintf(dp, ";user=%s", sesInfo->user_name);
164         }
165 
166         dp = description + strlen(description);
167         sprintf(dp, ";pid=0x%x", current->pid);
168 
169         cifs_dbg(FYI, "key description = %s\n", description);
170         saved_cred = override_creds(spnego_cred);
171         spnego_key = request_key(&cifs_spnego_key_type, description, "");
172         revert_creds(saved_cred);
173 
174 #ifdef CONFIG_CIFS_DEBUG2
175         if (cifsFYI && !IS_ERR(spnego_key)) {
176                 struct cifs_spnego_msg *msg = spnego_key->payload.data[0];
177                 cifs_dump_mem("SPNEGO reply blob:", msg->data, min(1024U,
178                                 msg->secblob_len + msg->sesskey_len));
179         }
180 #endif /* CONFIG_CIFS_DEBUG2 */
181 
182 out:
183         kfree(description);
184         return spnego_key;
185 }
186 
187 int
188 init_cifs_spnego(void)
189 {
190         struct cred *cred;
191         struct key *keyring;
192         int ret;
193 
194         cifs_dbg(FYI, "Registering the %s key type\n",
195                  cifs_spnego_key_type.name);
196 
197         /*
198          * Create an override credential set with special thread keyring for
199          * spnego upcalls.
200          */
201 
202         cred = prepare_kernel_cred(NULL);
203         if (!cred)
204                 return -ENOMEM;
205 
206         keyring = keyring_alloc(".cifs_spnego",
207                                 GLOBAL_ROOT_UID, GLOBAL_ROOT_GID, cred,
208                                 (KEY_POS_ALL & ~KEY_POS_SETATTR) |
209                                 KEY_USR_VIEW | KEY_USR_READ,
210                                 KEY_ALLOC_NOT_IN_QUOTA, NULL, NULL);
211         if (IS_ERR(keyring)) {
212                 ret = PTR_ERR(keyring);
213                 goto failed_put_cred;
214         }
215 
216         ret = register_key_type(&cifs_spnego_key_type);
217         if (ret < 0)
218                 goto failed_put_key;
219 
220         /*
221          * instruct request_key() to use this special keyring as a cache for
222          * the results it looks up
223          */
224         set_bit(KEY_FLAG_ROOT_CAN_CLEAR, &keyring->flags);
225         cred->thread_keyring = keyring;
226         cred->jit_keyring = KEY_REQKEY_DEFL_THREAD_KEYRING;
227         spnego_cred = cred;
228 
229         cifs_dbg(FYI, "cifs spnego keyring: %d\n", key_serial(keyring));
230         return 0;
231 
232 failed_put_key:
233         key_put(keyring);
234 failed_put_cred:
235         put_cred(cred);
236         return ret;
237 }
238 
239 void
240 exit_cifs_spnego(void)
241 {
242         key_revoke(spnego_cred->thread_keyring);
243         unregister_key_type(&cifs_spnego_key_type);
244         put_cred(spnego_cred);
245         cifs_dbg(FYI, "Unregistered %s key type\n", cifs_spnego_key_type.name);
246 }
247 

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