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 | ||
42 | static 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) { | |
58 | cERROR(1, "%s: Could not update with response\n", __func__); | |
59 | return rc; | |
60 | } | |
61 | ||
62 | rc = crypto_shash_init(&server->secmech.sdeschmacsha256->shash); | |
63 | if (rc) { | |
64 | cERROR(1, "%s: Could not init md5\n", __func__); | |
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) { | |
72 | cERROR(1, "null iovec entry"); | |
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) { | |
93 | cERROR(1, "%s: Could not update with payload\n", | |
94 | __func__); | |
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) | |
112 | cERROR(1, "%s: Could not generate sha256 hash\n", __func__); | |
113 | ||
114 | memcpy(smb2_pdu->Signature, sigptr, SMB2_SIGNATURE_SIZE); | |
115 | ||
116 | return rc; | |
117 | } | |
118 | ||
119 | /* must be called with server->srv_mutex held */ | |
120 | static int | |
0b688cfc | 121 | smb2_sign_rqst(struct smb_rqst *rqst, struct TCP_Server_Info *server) |
3c1bf7e4 PS |
122 | { |
123 | int rc = 0; | |
0b688cfc | 124 | struct smb2_hdr *smb2_pdu = rqst->rq_iov[0].iov_base; |
3c1bf7e4 PS |
125 | |
126 | if (!(smb2_pdu->Flags & SMB2_FLAGS_SIGNED) || | |
127 | server->tcpStatus == CifsNeedNegotiate) | |
128 | return rc; | |
129 | ||
130 | if (!server->session_estab) { | |
131 | strncpy(smb2_pdu->Signature, "BSRSPYL", 8); | |
132 | return rc; | |
133 | } | |
134 | ||
0b688cfc | 135 | rc = smb2_calc_signature(rqst, server); |
3c1bf7e4 PS |
136 | |
137 | return rc; | |
138 | } | |
139 | ||
140 | int | |
0b688cfc | 141 | smb2_verify_signature(struct smb_rqst *rqst, struct TCP_Server_Info *server) |
3c1bf7e4 PS |
142 | { |
143 | unsigned int rc; | |
144 | char server_response_sig[16]; | |
0b688cfc | 145 | struct smb2_hdr *smb2_pdu = (struct smb2_hdr *)rqst->rq_iov[0].iov_base; |
3c1bf7e4 PS |
146 | |
147 | if ((smb2_pdu->Command == SMB2_NEGOTIATE) || | |
148 | (smb2_pdu->Command == SMB2_OPLOCK_BREAK) || | |
149 | (!server->session_estab)) | |
150 | return 0; | |
151 | ||
152 | /* | |
153 | * BB what if signatures are supposed to be on for session but | |
154 | * server does not send one? BB | |
155 | */ | |
156 | ||
157 | /* Do not need to verify session setups with signature "BSRSPYL " */ | |
158 | if (memcmp(smb2_pdu->Signature, "BSRSPYL ", 8) == 0) | |
159 | cFYI(1, "dummy signature received for smb command 0x%x", | |
160 | smb2_pdu->Command); | |
161 | ||
162 | /* | |
163 | * Save off the origiginal signature so we can modify the smb and check | |
164 | * our calculated signature against what the server sent. | |
165 | */ | |
166 | memcpy(server_response_sig, smb2_pdu->Signature, SMB2_SIGNATURE_SIZE); | |
167 | ||
168 | memset(smb2_pdu->Signature, 0, SMB2_SIGNATURE_SIZE); | |
169 | ||
170 | mutex_lock(&server->srv_mutex); | |
0b688cfc | 171 | rc = smb2_calc_signature(rqst, server); |
3c1bf7e4 PS |
172 | mutex_unlock(&server->srv_mutex); |
173 | ||
174 | if (rc) | |
175 | return rc; | |
176 | ||
177 | if (memcmp(server_response_sig, smb2_pdu->Signature, | |
178 | SMB2_SIGNATURE_SIZE)) | |
179 | return -EACCES; | |
180 | else | |
181 | return 0; | |
182 | } | |
183 | ||
2dc7e1c0 PS |
184 | /* |
185 | * Set message id for the request. Should be called after wait_for_free_request | |
186 | * and when srv_mutex is held. | |
187 | */ | |
188 | static inline void | |
189 | smb2_seq_num_into_buf(struct TCP_Server_Info *server, struct smb2_hdr *hdr) | |
190 | { | |
191 | hdr->MessageId = get_next_mid(server); | |
192 | } | |
193 | ||
194 | static struct mid_q_entry * | |
195 | smb2_mid_entry_alloc(const struct smb2_hdr *smb_buffer, | |
196 | struct TCP_Server_Info *server) | |
197 | { | |
198 | struct mid_q_entry *temp; | |
199 | ||
200 | if (server == NULL) { | |
201 | cERROR(1, "Null TCP session in smb2_mid_entry_alloc"); | |
202 | return NULL; | |
203 | } | |
204 | ||
205 | temp = mempool_alloc(cifs_mid_poolp, GFP_NOFS); | |
206 | if (temp == NULL) | |
207 | return temp; | |
208 | else { | |
209 | memset(temp, 0, sizeof(struct mid_q_entry)); | |
210 | temp->mid = smb_buffer->MessageId; /* always LE */ | |
211 | temp->pid = current->pid; | |
212 | temp->command = smb_buffer->Command; /* Always LE */ | |
213 | temp->when_alloc = jiffies; | |
214 | temp->server = server; | |
215 | ||
216 | /* | |
217 | * The default is for the mid to be synchronous, so the | |
218 | * default callback just wakes up the current task. | |
219 | */ | |
220 | temp->callback = cifs_wake_up_task; | |
221 | temp->callback_data = current; | |
222 | } | |
223 | ||
224 | atomic_inc(&midCount); | |
225 | temp->mid_state = MID_REQUEST_ALLOCATED; | |
226 | return temp; | |
227 | } | |
228 | ||
229 | static int | |
230 | smb2_get_mid_entry(struct cifs_ses *ses, struct smb2_hdr *buf, | |
231 | struct mid_q_entry **mid) | |
232 | { | |
233 | if (ses->server->tcpStatus == CifsExiting) | |
234 | return -ENOENT; | |
235 | ||
236 | if (ses->server->tcpStatus == CifsNeedReconnect) { | |
237 | cFYI(1, "tcp session dead - return to caller to retry"); | |
238 | return -EAGAIN; | |
239 | } | |
240 | ||
241 | if (ses->status != CifsGood) { | |
242 | /* check if SMB2 session is bad because we are setting it up */ | |
243 | if ((buf->Command != SMB2_SESSION_SETUP) && | |
244 | (buf->Command != SMB2_NEGOTIATE)) | |
245 | return -EAGAIN; | |
246 | /* else ok - we are setting up session */ | |
247 | } | |
248 | *mid = smb2_mid_entry_alloc(buf, ses->server); | |
249 | if (*mid == NULL) | |
250 | return -ENOMEM; | |
251 | spin_lock(&GlobalMid_Lock); | |
252 | list_add_tail(&(*mid)->qhead, &ses->server->pending_mid_q); | |
253 | spin_unlock(&GlobalMid_Lock); | |
254 | return 0; | |
255 | } | |
256 | ||
257 | int | |
258 | smb2_check_receive(struct mid_q_entry *mid, struct TCP_Server_Info *server, | |
259 | bool log_error) | |
260 | { | |
261 | unsigned int len = get_rfc1002_length(mid->resp_buf); | |
0b688cfc JL |
262 | struct kvec iov; |
263 | struct smb_rqst rqst = { .rq_iov = &iov, | |
264 | .rq_nvec = 1 }; | |
265 | ||
266 | iov.iov_base = (char *)mid->resp_buf; | |
267 | iov.iov_len = get_rfc1002_length(mid->resp_buf) + 4; | |
2dc7e1c0 PS |
268 | |
269 | dump_smb(mid->resp_buf, min_t(u32, 80, len)); | |
270 | /* convert the length into a more usable form */ | |
3c1bf7e4 | 271 | if ((len > 24) && |
2dc7e1c0 | 272 | (server->sec_mode & (SECMODE_SIGN_REQUIRED|SECMODE_SIGN_ENABLED))) { |
3c1bf7e4 PS |
273 | int rc; |
274 | ||
0b688cfc | 275 | rc = smb2_verify_signature(&rqst, server); |
3c1bf7e4 PS |
276 | if (rc) |
277 | cERROR(1, "SMB signature verification returned error = " | |
278 | "%d", rc); | |
279 | } | |
2dc7e1c0 PS |
280 | |
281 | return map_smb2_to_linux_error(mid->resp_buf, log_error); | |
282 | } | |
283 | ||
fec344e3 JL |
284 | struct mid_q_entry * |
285 | smb2_setup_request(struct cifs_ses *ses, struct smb_rqst *rqst) | |
2dc7e1c0 PS |
286 | { |
287 | int rc; | |
fec344e3 | 288 | struct smb2_hdr *hdr = (struct smb2_hdr *)rqst->rq_iov[0].iov_base; |
2dc7e1c0 PS |
289 | struct mid_q_entry *mid; |
290 | ||
291 | smb2_seq_num_into_buf(ses->server, hdr); | |
292 | ||
293 | rc = smb2_get_mid_entry(ses, hdr, &mid); | |
294 | if (rc) | |
fec344e3 JL |
295 | return ERR_PTR(rc); |
296 | rc = smb2_sign_rqst(rqst, ses->server); | |
297 | if (rc) { | |
3c1bf7e4 | 298 | cifs_delete_mid(mid); |
fec344e3 JL |
299 | return ERR_PTR(rc); |
300 | } | |
301 | return mid; | |
2dc7e1c0 PS |
302 | } |
303 | ||
fec344e3 JL |
304 | struct mid_q_entry * |
305 | smb2_setup_async_request(struct TCP_Server_Info *server, struct smb_rqst *rqst) | |
c95b8eed | 306 | { |
fec344e3 JL |
307 | int rc; |
308 | struct smb2_hdr *hdr = (struct smb2_hdr *)rqst->rq_iov[0].iov_base; | |
c95b8eed PS |
309 | struct mid_q_entry *mid; |
310 | ||
311 | smb2_seq_num_into_buf(server, hdr); | |
312 | ||
313 | mid = smb2_mid_entry_alloc(hdr, server); | |
314 | if (mid == NULL) | |
fec344e3 | 315 | return ERR_PTR(-ENOMEM); |
c95b8eed | 316 | |
fec344e3 | 317 | rc = smb2_sign_rqst(rqst, server); |
c95b8eed PS |
318 | if (rc) { |
319 | DeleteMidQEntry(mid); | |
fec344e3 | 320 | return ERR_PTR(rc); |
3c1bf7e4 PS |
321 | } |
322 | ||
fec344e3 | 323 | return mid; |
c95b8eed | 324 | } |