Commit | Line | Data |
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2dc7e1c0 PS |
1 | /* |
2 | * fs/cifs/smb2transport.c | |
3 | * | |
4 | * Copyright (C) International Business Machines Corp., 2002, 2011 | |
5 | * Etersoft, 2012 | |
6 | * Author(s): Steve French (sfrench@us.ibm.com) | |
7 | * Jeremy Allison (jra@samba.org) 2006 | |
8 | * Pavel Shilovsky (pshilovsky@samba.org) 2012 | |
9 | * | |
10 | * This library is free software; you can redistribute it and/or modify | |
11 | * it under the terms of the GNU Lesser General Public License as published | |
12 | * by the Free Software Foundation; either version 2.1 of the License, or | |
13 | * (at your option) any later version. | |
14 | * | |
15 | * This library is distributed in the hope that it will be useful, | |
16 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
17 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See | |
18 | * the GNU Lesser General Public License for more details. | |
19 | * | |
20 | * You should have received a copy of the GNU Lesser General Public License | |
21 | * along with this library; if not, write to the Free Software | |
22 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
23 | */ | |
24 | ||
25 | #include <linux/fs.h> | |
26 | #include <linux/list.h> | |
27 | #include <linux/wait.h> | |
28 | #include <linux/net.h> | |
29 | #include <linux/delay.h> | |
30 | #include <linux/uaccess.h> | |
31 | #include <asm/processor.h> | |
32 | #include <linux/mempool.h> | |
fb308a6f | 33 | #include <linux/highmem.h> |
2dc7e1c0 PS |
34 | #include "smb2pdu.h" |
35 | #include "cifsglob.h" | |
36 | #include "cifsproto.h" | |
37 | #include "smb2proto.h" | |
38 | #include "cifs_debug.h" | |
39 | #include "smb2status.h" | |
3c1bf7e4 PS |
40 | #include "smb2glob.h" |
41 | ||
38107d45 | 42 | int |
0b688cfc | 43 | smb2_calc_signature(struct smb_rqst *rqst, struct TCP_Server_Info *server) |
3c1bf7e4 PS |
44 | { |
45 | int i, rc; | |
46 | unsigned char smb2_signature[SMB2_HMACSHA256_SIZE]; | |
47 | unsigned char *sigptr = smb2_signature; | |
0b688cfc JL |
48 | struct kvec *iov = rqst->rq_iov; |
49 | int n_vec = rqst->rq_nvec; | |
3c1bf7e4 PS |
50 | struct smb2_hdr *smb2_pdu = (struct smb2_hdr *)iov[0].iov_base; |
51 | ||
52 | memset(smb2_signature, 0x0, SMB2_HMACSHA256_SIZE); | |
53 | memset(smb2_pdu->Signature, 0x0, SMB2_SIGNATURE_SIZE); | |
54 | ||
55 | rc = crypto_shash_setkey(server->secmech.hmacsha256, | |
56 | server->session_key.response, SMB2_NTLMV2_SESSKEY_SIZE); | |
57 | if (rc) { | |
f96637be | 58 | cifs_dbg(VFS, "%s: Could not update with response\n", __func__); |
3c1bf7e4 PS |
59 | return rc; |
60 | } | |
61 | ||
62 | rc = crypto_shash_init(&server->secmech.sdeschmacsha256->shash); | |
63 | if (rc) { | |
f96637be | 64 | cifs_dbg(VFS, "%s: Could not init md5\n", __func__); |
3c1bf7e4 PS |
65 | return rc; |
66 | } | |
67 | ||
68 | for (i = 0; i < n_vec; i++) { | |
69 | if (iov[i].iov_len == 0) | |
70 | continue; | |
71 | if (iov[i].iov_base == NULL) { | |
f96637be | 72 | cifs_dbg(VFS, "null iovec entry\n"); |
3c1bf7e4 PS |
73 | return -EIO; |
74 | } | |
75 | /* | |
76 | * The first entry includes a length field (which does not get | |
77 | * signed that occupies the first 4 bytes before the header). | |
78 | */ | |
79 | if (i == 0) { | |
80 | if (iov[0].iov_len <= 8) /* cmd field at offset 9 */ | |
81 | break; /* nothing to sign or corrupt header */ | |
82 | rc = | |
83 | crypto_shash_update( | |
84 | &server->secmech.sdeschmacsha256->shash, | |
85 | iov[i].iov_base + 4, iov[i].iov_len - 4); | |
86 | } else { | |
87 | rc = | |
88 | crypto_shash_update( | |
89 | &server->secmech.sdeschmacsha256->shash, | |
90 | iov[i].iov_base, iov[i].iov_len); | |
91 | } | |
92 | if (rc) { | |
f96637be JP |
93 | cifs_dbg(VFS, "%s: Could not update with payload\n", |
94 | __func__); | |
3c1bf7e4 PS |
95 | return rc; |
96 | } | |
97 | } | |
98 | ||
fb308a6f JL |
99 | /* now hash over the rq_pages array */ |
100 | for (i = 0; i < rqst->rq_npages; i++) { | |
101 | struct kvec p_iov; | |
102 | ||
103 | cifs_rqst_page_to_kvec(rqst, i, &p_iov); | |
104 | crypto_shash_update(&server->secmech.sdeschmacsha256->shash, | |
105 | p_iov.iov_base, p_iov.iov_len); | |
106 | kunmap(rqst->rq_pages[i]); | |
107 | } | |
108 | ||
3c1bf7e4 PS |
109 | rc = crypto_shash_final(&server->secmech.sdeschmacsha256->shash, |
110 | sigptr); | |
111 | if (rc) | |
f96637be | 112 | cifs_dbg(VFS, "%s: Could not generate sha256 hash\n", __func__); |
3c1bf7e4 PS |
113 | |
114 | memcpy(smb2_pdu->Signature, sigptr, SMB2_SIGNATURE_SIZE); | |
115 | ||
116 | return rc; | |
117 | } | |
118 | ||
38107d45 SF |
119 | int |
120 | smb3_calc_signature(struct smb_rqst *rqst, struct TCP_Server_Info *server) | |
121 | { | |
f96637be | 122 | cifs_dbg(FYI, "smb3 signatures not supported yet\n"); |
38107d45 SF |
123 | return -EOPNOTSUPP; |
124 | } | |
125 | ||
3c1bf7e4 PS |
126 | /* must be called with server->srv_mutex held */ |
127 | static int | |
0b688cfc | 128 | smb2_sign_rqst(struct smb_rqst *rqst, struct TCP_Server_Info *server) |
3c1bf7e4 PS |
129 | { |
130 | int rc = 0; | |
0b688cfc | 131 | struct smb2_hdr *smb2_pdu = rqst->rq_iov[0].iov_base; |
3c1bf7e4 PS |
132 | |
133 | if (!(smb2_pdu->Flags & SMB2_FLAGS_SIGNED) || | |
134 | server->tcpStatus == CifsNeedNegotiate) | |
135 | return rc; | |
136 | ||
137 | if (!server->session_estab) { | |
138 | strncpy(smb2_pdu->Signature, "BSRSPYL", 8); | |
139 | return rc; | |
140 | } | |
141 | ||
38107d45 | 142 | rc = server->ops->calc_signature(rqst, server); |
3c1bf7e4 PS |
143 | |
144 | return rc; | |
145 | } | |
146 | ||
147 | int | |
0b688cfc | 148 | smb2_verify_signature(struct smb_rqst *rqst, struct TCP_Server_Info *server) |
3c1bf7e4 PS |
149 | { |
150 | unsigned int rc; | |
151 | char server_response_sig[16]; | |
0b688cfc | 152 | struct smb2_hdr *smb2_pdu = (struct smb2_hdr *)rqst->rq_iov[0].iov_base; |
3c1bf7e4 PS |
153 | |
154 | if ((smb2_pdu->Command == SMB2_NEGOTIATE) || | |
155 | (smb2_pdu->Command == SMB2_OPLOCK_BREAK) || | |
156 | (!server->session_estab)) | |
157 | return 0; | |
158 | ||
159 | /* | |
160 | * BB what if signatures are supposed to be on for session but | |
161 | * server does not send one? BB | |
162 | */ | |
163 | ||
164 | /* Do not need to verify session setups with signature "BSRSPYL " */ | |
165 | if (memcmp(smb2_pdu->Signature, "BSRSPYL ", 8) == 0) | |
f96637be JP |
166 | cifs_dbg(FYI, "dummy signature received for smb command 0x%x\n", |
167 | smb2_pdu->Command); | |
3c1bf7e4 PS |
168 | |
169 | /* | |
170 | * Save off the origiginal signature so we can modify the smb and check | |
171 | * our calculated signature against what the server sent. | |
172 | */ | |
173 | memcpy(server_response_sig, smb2_pdu->Signature, SMB2_SIGNATURE_SIZE); | |
174 | ||
175 | memset(smb2_pdu->Signature, 0, SMB2_SIGNATURE_SIZE); | |
176 | ||
177 | mutex_lock(&server->srv_mutex); | |
38107d45 | 178 | rc = server->ops->calc_signature(rqst, server); |
3c1bf7e4 PS |
179 | mutex_unlock(&server->srv_mutex); |
180 | ||
181 | if (rc) | |
182 | return rc; | |
183 | ||
184 | if (memcmp(server_response_sig, smb2_pdu->Signature, | |
185 | SMB2_SIGNATURE_SIZE)) | |
186 | return -EACCES; | |
187 | else | |
188 | return 0; | |
189 | } | |
190 | ||
2dc7e1c0 PS |
191 | /* |
192 | * Set message id for the request. Should be called after wait_for_free_request | |
193 | * and when srv_mutex is held. | |
194 | */ | |
195 | static inline void | |
196 | smb2_seq_num_into_buf(struct TCP_Server_Info *server, struct smb2_hdr *hdr) | |
197 | { | |
198 | hdr->MessageId = get_next_mid(server); | |
199 | } | |
200 | ||
201 | static struct mid_q_entry * | |
202 | smb2_mid_entry_alloc(const struct smb2_hdr *smb_buffer, | |
203 | struct TCP_Server_Info *server) | |
204 | { | |
205 | struct mid_q_entry *temp; | |
206 | ||
207 | if (server == NULL) { | |
f96637be | 208 | cifs_dbg(VFS, "Null TCP session in smb2_mid_entry_alloc\n"); |
2dc7e1c0 PS |
209 | return NULL; |
210 | } | |
211 | ||
212 | temp = mempool_alloc(cifs_mid_poolp, GFP_NOFS); | |
213 | if (temp == NULL) | |
214 | return temp; | |
215 | else { | |
216 | memset(temp, 0, sizeof(struct mid_q_entry)); | |
217 | temp->mid = smb_buffer->MessageId; /* always LE */ | |
218 | temp->pid = current->pid; | |
219 | temp->command = smb_buffer->Command; /* Always LE */ | |
220 | temp->when_alloc = jiffies; | |
221 | temp->server = server; | |
222 | ||
223 | /* | |
224 | * The default is for the mid to be synchronous, so the | |
225 | * default callback just wakes up the current task. | |
226 | */ | |
227 | temp->callback = cifs_wake_up_task; | |
228 | temp->callback_data = current; | |
229 | } | |
230 | ||
231 | atomic_inc(&midCount); | |
232 | temp->mid_state = MID_REQUEST_ALLOCATED; | |
233 | return temp; | |
234 | } | |
235 | ||
236 | static int | |
237 | smb2_get_mid_entry(struct cifs_ses *ses, struct smb2_hdr *buf, | |
238 | struct mid_q_entry **mid) | |
239 | { | |
240 | if (ses->server->tcpStatus == CifsExiting) | |
241 | return -ENOENT; | |
242 | ||
243 | if (ses->server->tcpStatus == CifsNeedReconnect) { | |
f96637be | 244 | cifs_dbg(FYI, "tcp session dead - return to caller to retry\n"); |
2dc7e1c0 PS |
245 | return -EAGAIN; |
246 | } | |
247 | ||
248 | if (ses->status != CifsGood) { | |
249 | /* check if SMB2 session is bad because we are setting it up */ | |
250 | if ((buf->Command != SMB2_SESSION_SETUP) && | |
251 | (buf->Command != SMB2_NEGOTIATE)) | |
252 | return -EAGAIN; | |
253 | /* else ok - we are setting up session */ | |
254 | } | |
255 | *mid = smb2_mid_entry_alloc(buf, ses->server); | |
256 | if (*mid == NULL) | |
257 | return -ENOMEM; | |
258 | spin_lock(&GlobalMid_Lock); | |
259 | list_add_tail(&(*mid)->qhead, &ses->server->pending_mid_q); | |
260 | spin_unlock(&GlobalMid_Lock); | |
261 | return 0; | |
262 | } | |
263 | ||
264 | int | |
265 | smb2_check_receive(struct mid_q_entry *mid, struct TCP_Server_Info *server, | |
266 | bool log_error) | |
267 | { | |
268 | unsigned int len = get_rfc1002_length(mid->resp_buf); | |
0b688cfc JL |
269 | struct kvec iov; |
270 | struct smb_rqst rqst = { .rq_iov = &iov, | |
271 | .rq_nvec = 1 }; | |
272 | ||
273 | iov.iov_base = (char *)mid->resp_buf; | |
274 | iov.iov_len = get_rfc1002_length(mid->resp_buf) + 4; | |
2dc7e1c0 PS |
275 | |
276 | dump_smb(mid->resp_buf, min_t(u32, 80, len)); | |
277 | /* convert the length into a more usable form */ | |
3c1bf7e4 | 278 | if ((len > 24) && |
2dc7e1c0 | 279 | (server->sec_mode & (SECMODE_SIGN_REQUIRED|SECMODE_SIGN_ENABLED))) { |
3c1bf7e4 PS |
280 | int rc; |
281 | ||
0b688cfc | 282 | rc = smb2_verify_signature(&rqst, server); |
3c1bf7e4 | 283 | if (rc) |
f96637be JP |
284 | cifs_dbg(VFS, "SMB signature verification returned error = %d\n", |
285 | rc); | |
3c1bf7e4 | 286 | } |
2dc7e1c0 PS |
287 | |
288 | return map_smb2_to_linux_error(mid->resp_buf, log_error); | |
289 | } | |
290 | ||
fec344e3 JL |
291 | struct mid_q_entry * |
292 | smb2_setup_request(struct cifs_ses *ses, struct smb_rqst *rqst) | |
2dc7e1c0 PS |
293 | { |
294 | int rc; | |
fec344e3 | 295 | struct smb2_hdr *hdr = (struct smb2_hdr *)rqst->rq_iov[0].iov_base; |
2dc7e1c0 PS |
296 | struct mid_q_entry *mid; |
297 | ||
298 | smb2_seq_num_into_buf(ses->server, hdr); | |
299 | ||
300 | rc = smb2_get_mid_entry(ses, hdr, &mid); | |
301 | if (rc) | |
fec344e3 JL |
302 | return ERR_PTR(rc); |
303 | rc = smb2_sign_rqst(rqst, ses->server); | |
304 | if (rc) { | |
3c1bf7e4 | 305 | cifs_delete_mid(mid); |
fec344e3 JL |
306 | return ERR_PTR(rc); |
307 | } | |
308 | return mid; | |
2dc7e1c0 PS |
309 | } |
310 | ||
fec344e3 JL |
311 | struct mid_q_entry * |
312 | smb2_setup_async_request(struct TCP_Server_Info *server, struct smb_rqst *rqst) | |
c95b8eed | 313 | { |
fec344e3 JL |
314 | int rc; |
315 | struct smb2_hdr *hdr = (struct smb2_hdr *)rqst->rq_iov[0].iov_base; | |
c95b8eed PS |
316 | struct mid_q_entry *mid; |
317 | ||
318 | smb2_seq_num_into_buf(server, hdr); | |
319 | ||
320 | mid = smb2_mid_entry_alloc(hdr, server); | |
321 | if (mid == NULL) | |
fec344e3 | 322 | return ERR_PTR(-ENOMEM); |
c95b8eed | 323 | |
fec344e3 | 324 | rc = smb2_sign_rqst(rqst, server); |
c95b8eed PS |
325 | if (rc) { |
326 | DeleteMidQEntry(mid); | |
fec344e3 | 327 | return ERR_PTR(rc); |
3c1bf7e4 PS |
328 | } |
329 | ||
fec344e3 | 330 | return mid; |
c95b8eed | 331 | } |