Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * fs/cifs/cifsencrypt.c | |
3 | * | |
12b3b8ff | 4 | * Copyright (C) International Business Machines Corp., 2005,2006 |
1da177e4 LT |
5 | * Author(s): Steve French (sfrench@us.ibm.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/fs.h> | |
23 | #include "cifspdu.h" | |
24 | #include "cifsglob.h" | |
25 | #include "cifs_debug.h" | |
26 | #include "md5.h" | |
27 | #include "cifs_unicode.h" | |
28 | #include "cifsproto.h" | |
7c7b25bc | 29 | #include <linux/ctype.h> |
6d027cfd | 30 | #include <linux/random.h> |
1da177e4 LT |
31 | |
32 | /* Calculate and return the CIFS signature based on the mac key and the smb pdu */ | |
33 | /* the 16 byte signature must be allocated by the caller */ | |
34 | /* Note we only use the 1st eight bytes */ | |
35 | /* Note that the smb header signature field on input contains the | |
36 | sequence number before this function is called */ | |
37 | ||
38 | extern void mdfour(unsigned char *out, unsigned char *in, int n); | |
39 | extern void E_md4hash(const unsigned char *passwd, unsigned char *p16); | |
7c7b25bc SF |
40 | extern void SMBencrypt(unsigned char *passwd, unsigned char *c8, |
41 | unsigned char *p24); | |
1da177e4 | 42 | |
12b3b8ff SF |
43 | static int cifs_calculate_signature(const struct smb_hdr * cifs_pdu, |
44 | const char * key, char * signature) | |
1da177e4 LT |
45 | { |
46 | struct MD5Context context; | |
47 | ||
48 | if((cifs_pdu == NULL) || (signature == NULL)) | |
49 | return -EINVAL; | |
50 | ||
51 | MD5Init(&context); | |
7c7b25bc | 52 | MD5Update(&context,key,CIFS_SESS_KEY_SIZE+16); |
1da177e4 LT |
53 | MD5Update(&context,cifs_pdu->Protocol,cifs_pdu->smb_buf_length); |
54 | MD5Final(signature,&context); | |
55 | return 0; | |
56 | } | |
57 | ||
ad009ac9 | 58 | int cifs_sign_smb(struct smb_hdr * cifs_pdu, struct TCP_Server_Info * server, |
1da177e4 LT |
59 | __u32 * pexpected_response_sequence_number) |
60 | { | |
61 | int rc = 0; | |
62 | char smb_signature[20]; | |
63 | ||
ad009ac9 | 64 | if((cifs_pdu == NULL) || (server == NULL)) |
1da177e4 LT |
65 | return -EINVAL; |
66 | ||
67 | if((cifs_pdu->Flags2 & SMBFLG2_SECURITY_SIGNATURE) == 0) | |
68 | return rc; | |
69 | ||
70 | spin_lock(&GlobalMid_Lock); | |
ad009ac9 | 71 | cifs_pdu->Signature.Sequence.SequenceNumber = cpu_to_le32(server->sequence_number); |
1da177e4 LT |
72 | cifs_pdu->Signature.Sequence.Reserved = 0; |
73 | ||
ad009ac9 SF |
74 | *pexpected_response_sequence_number = server->sequence_number++; |
75 | server->sequence_number++; | |
1da177e4 LT |
76 | spin_unlock(&GlobalMid_Lock); |
77 | ||
ad009ac9 | 78 | rc = cifs_calculate_signature(cifs_pdu, server->mac_signing_key,smb_signature); |
1da177e4 LT |
79 | if(rc) |
80 | memset(cifs_pdu->Signature.SecuritySignature, 0, 8); | |
81 | else | |
82 | memcpy(cifs_pdu->Signature.SecuritySignature, smb_signature, 8); | |
83 | ||
84 | return rc; | |
85 | } | |
86 | ||
84afc29b SF |
87 | static int cifs_calc_signature2(const struct kvec * iov, int n_vec, |
88 | const char * key, char * signature) | |
89 | { | |
e9917a00 SF |
90 | struct MD5Context context; |
91 | int i; | |
84afc29b | 92 | |
e9917a00 SF |
93 | if((iov == NULL) || (signature == NULL)) |
94 | return -EINVAL; | |
84afc29b | 95 | |
e9917a00 | 96 | MD5Init(&context); |
7c7b25bc | 97 | MD5Update(&context,key,CIFS_SESS_KEY_SIZE+16); |
e9917a00 SF |
98 | for(i=0;i<n_vec;i++) { |
99 | if(iov[i].iov_base == NULL) { | |
100 | cERROR(1,("null iovec entry")); | |
101 | return -EIO; | |
102 | } else if(iov[i].iov_len == 0) | |
103 | break; /* bail out if we are sent nothing to sign */ | |
104 | /* The first entry includes a length field (which does not get | |
105 | signed that occupies the first 4 bytes before the header */ | |
106 | if(i==0) { | |
107 | if (iov[0].iov_len <= 8 ) /* cmd field at offset 9 */ | |
108 | break; /* nothing to sign or corrupt header */ | |
109 | MD5Update(&context,iov[0].iov_base+4, iov[0].iov_len-4); | |
110 | } else | |
111 | MD5Update(&context,iov[i].iov_base, iov[i].iov_len); | |
112 | } | |
84afc29b | 113 | |
e9917a00 | 114 | MD5Final(signature,&context); |
84afc29b | 115 | |
e9917a00 | 116 | return 0; |
84afc29b SF |
117 | } |
118 | ||
119 | ||
120 | int cifs_sign_smb2(struct kvec * iov, int n_vec, struct TCP_Server_Info *server, | |
121 | __u32 * pexpected_response_sequence_number) | |
122 | { | |
123 | int rc = 0; | |
124 | char smb_signature[20]; | |
125 | struct smb_hdr * cifs_pdu = iov[0].iov_base; | |
126 | ||
127 | if((cifs_pdu == NULL) || (server == NULL)) | |
128 | return -EINVAL; | |
129 | ||
130 | if((cifs_pdu->Flags2 & SMBFLG2_SECURITY_SIGNATURE) == 0) | |
131 | return rc; | |
132 | ||
133 | spin_lock(&GlobalMid_Lock); | |
134 | cifs_pdu->Signature.Sequence.SequenceNumber = | |
135 | cpu_to_le32(server->sequence_number); | |
136 | cifs_pdu->Signature.Sequence.Reserved = 0; | |
137 | ||
138 | *pexpected_response_sequence_number = server->sequence_number++; | |
139 | server->sequence_number++; | |
140 | spin_unlock(&GlobalMid_Lock); | |
141 | ||
142 | rc = cifs_calc_signature2(iov, n_vec, server->mac_signing_key, | |
143 | smb_signature); | |
144 | if(rc) | |
145 | memset(cifs_pdu->Signature.SecuritySignature, 0, 8); | |
146 | else | |
147 | memcpy(cifs_pdu->Signature.SecuritySignature, smb_signature, 8); | |
148 | ||
149 | return rc; | |
150 | ||
151 | } | |
152 | ||
1da177e4 LT |
153 | int cifs_verify_signature(struct smb_hdr * cifs_pdu, const char * mac_key, |
154 | __u32 expected_sequence_number) | |
155 | { | |
156 | unsigned int rc; | |
157 | char server_response_sig[8]; | |
158 | char what_we_think_sig_should_be[20]; | |
159 | ||
160 | if((cifs_pdu == NULL) || (mac_key == NULL)) | |
161 | return -EINVAL; | |
162 | ||
163 | if (cifs_pdu->Command == SMB_COM_NEGOTIATE) | |
164 | return 0; | |
165 | ||
166 | if (cifs_pdu->Command == SMB_COM_LOCKING_ANDX) { | |
167 | struct smb_com_lock_req * pSMB = (struct smb_com_lock_req *)cifs_pdu; | |
168 | if(pSMB->LockType & LOCKING_ANDX_OPLOCK_RELEASE) | |
169 | return 0; | |
170 | } | |
171 | ||
172 | /* BB what if signatures are supposed to be on for session but server does not | |
173 | send one? BB */ | |
174 | ||
175 | /* Do not need to verify session setups with signature "BSRSPYL " */ | |
176 | if(memcmp(cifs_pdu->Signature.SecuritySignature,"BSRSPYL ",8)==0) | |
177 | cFYI(1,("dummy signature received for smb command 0x%x",cifs_pdu->Command)); | |
178 | ||
179 | /* save off the origiginal signature so we can modify the smb and check | |
180 | its signature against what the server sent */ | |
181 | memcpy(server_response_sig,cifs_pdu->Signature.SecuritySignature,8); | |
182 | ||
183 | cifs_pdu->Signature.Sequence.SequenceNumber = cpu_to_le32(expected_sequence_number); | |
184 | cifs_pdu->Signature.Sequence.Reserved = 0; | |
185 | ||
186 | rc = cifs_calculate_signature(cifs_pdu, mac_key, | |
187 | what_we_think_sig_should_be); | |
188 | ||
189 | if(rc) | |
190 | return rc; | |
191 | ||
192 | ||
193 | /* cifs_dump_mem("what we think it should be: ",what_we_think_sig_should_be,16); */ | |
194 | ||
195 | if(memcmp(server_response_sig, what_we_think_sig_should_be, 8)) | |
196 | return -EACCES; | |
197 | else | |
198 | return 0; | |
199 | ||
200 | } | |
201 | ||
202 | /* We fill in key by putting in 40 byte array which was allocated by caller */ | |
203 | int cifs_calculate_mac_key(char * key, const char * rn, const char * password) | |
204 | { | |
205 | char temp_key[16]; | |
206 | if ((key == NULL) || (rn == NULL)) | |
207 | return -EINVAL; | |
208 | ||
209 | E_md4hash(password, temp_key); | |
210 | mdfour(key,temp_key,16); | |
7c7b25bc | 211 | memcpy(key+16,rn, CIFS_SESS_KEY_SIZE); |
1da177e4 LT |
212 | return 0; |
213 | } | |
214 | ||
1717ffc5 SF |
215 | int CalcNTLMv2_partial_mac_key(struct cifsSesInfo * ses, |
216 | const struct nls_table * nls_info) | |
1da177e4 LT |
217 | { |
218 | char temp_hash[16]; | |
219 | struct HMACMD5Context ctx; | |
220 | char * ucase_buf; | |
e89dc920 | 221 | __le16 * unicode_buf; |
1da177e4 LT |
222 | unsigned int i,user_name_len,dom_name_len; |
223 | ||
224 | if(ses == NULL) | |
225 | return -EINVAL; | |
226 | ||
227 | E_md4hash(ses->password, temp_hash); | |
228 | ||
229 | hmac_md5_init_limK_to_64(temp_hash, 16, &ctx); | |
230 | user_name_len = strlen(ses->userName); | |
231 | if(user_name_len > MAX_USERNAME_SIZE) | |
232 | return -EINVAL; | |
3979877e SF |
233 | if(ses->domainName == NULL) |
234 | return -EINVAL; /* BB should we use CIFS_LINUX_DOM */ | |
1da177e4 LT |
235 | dom_name_len = strlen(ses->domainName); |
236 | if(dom_name_len > MAX_USERNAME_SIZE) | |
237 | return -EINVAL; | |
238 | ||
239 | ucase_buf = kmalloc((MAX_USERNAME_SIZE+1), GFP_KERNEL); | |
240 | if(ucase_buf == NULL) | |
241 | return -ENOMEM; | |
242 | unicode_buf = kmalloc((MAX_USERNAME_SIZE+1)*4, GFP_KERNEL); | |
243 | if(unicode_buf == NULL) { | |
244 | kfree(ucase_buf); | |
245 | return -ENOMEM; | |
246 | } | |
247 | ||
248 | for(i=0;i<user_name_len;i++) | |
249 | ucase_buf[i] = nls_info->charset2upper[(int)ses->userName[i]]; | |
250 | ucase_buf[i] = 0; | |
251 | user_name_len = cifs_strtoUCS(unicode_buf, ucase_buf, MAX_USERNAME_SIZE*2, nls_info); | |
252 | unicode_buf[user_name_len] = 0; | |
253 | user_name_len++; | |
254 | ||
255 | for(i=0;i<dom_name_len;i++) | |
256 | ucase_buf[i] = nls_info->charset2upper[(int)ses->domainName[i]]; | |
257 | ucase_buf[i] = 0; | |
258 | dom_name_len = cifs_strtoUCS(unicode_buf+user_name_len, ucase_buf, MAX_USERNAME_SIZE*2, nls_info); | |
259 | ||
260 | unicode_buf[user_name_len + dom_name_len] = 0; | |
261 | hmac_md5_update((const unsigned char *) unicode_buf, | |
262 | (user_name_len+dom_name_len)*2,&ctx); | |
263 | ||
ad009ac9 | 264 | hmac_md5_final(ses->server->mac_signing_key,&ctx); |
1da177e4 LT |
265 | kfree(ucase_buf); |
266 | kfree(unicode_buf); | |
267 | return 0; | |
268 | } | |
7c7b25bc SF |
269 | |
270 | #ifdef CONFIG_CIFS_WEAK_PW_HASH | |
271 | void calc_lanman_hash(struct cifsSesInfo * ses, char * lnm_session_key) | |
272 | { | |
273 | int i; | |
274 | char password_with_pad[CIFS_ENCPWD_SIZE]; | |
275 | ||
bdc4bf6e SF |
276 | if(ses->server == NULL) |
277 | return; | |
278 | ||
7c7b25bc | 279 | memset(password_with_pad, 0, CIFS_ENCPWD_SIZE); |
66abda5e SF |
280 | if(ses->password) |
281 | strncpy(password_with_pad, ses->password, CIFS_ENCPWD_SIZE); | |
7c7b25bc | 282 | |
bdc4bf6e SF |
283 | if((ses->server->secMode & SECMODE_PW_ENCRYPT) == 0) |
284 | if(extended_security & CIFSSEC_MAY_PLNTXT) { | |
285 | memcpy(lnm_session_key, password_with_pad, CIFS_ENCPWD_SIZE); | |
286 | return; | |
287 | } | |
288 | ||
7c7b25bc SF |
289 | /* calculate old style session key */ |
290 | /* calling toupper is less broken than repeatedly | |
291 | calling nls_toupper would be since that will never | |
292 | work for UTF8, but neither handles multibyte code pages | |
293 | but the only alternative would be converting to UCS-16 (Unicode) | |
294 | (using a routine something like UniStrupr) then | |
295 | uppercasing and then converting back from Unicode - which | |
296 | would only worth doing it if we knew it were utf8. Basically | |
297 | utf8 and other multibyte codepages each need their own strupper | |
298 | function since a byte at a time will ont work. */ | |
299 | ||
300 | for(i = 0; i < CIFS_ENCPWD_SIZE; i++) { | |
301 | password_with_pad[i] = toupper(password_with_pad[i]); | |
302 | } | |
303 | ||
304 | SMBencrypt(password_with_pad, ses->server->cryptKey, lnm_session_key); | |
305 | /* clear password before we return/free memory */ | |
306 | memset(password_with_pad, 0, CIFS_ENCPWD_SIZE); | |
307 | } | |
308 | #endif /* CIFS_WEAK_PW_HASH */ | |
309 | ||
1717ffc5 SF |
310 | static int calc_ntlmv2_hash(struct cifsSesInfo *ses, |
311 | const struct nls_table * nls_cp) | |
a8ee0344 SF |
312 | { |
313 | int rc = 0; | |
314 | int len; | |
315 | char nt_hash[16]; | |
316 | struct HMACMD5Context * pctxt; | |
1717ffc5 SF |
317 | wchar_t * user; |
318 | wchar_t * domain; | |
a8ee0344 SF |
319 | |
320 | pctxt = kmalloc(sizeof(struct HMACMD5Context), GFP_KERNEL); | |
321 | ||
322 | if(pctxt == NULL) | |
323 | return -ENOMEM; | |
324 | ||
325 | /* calculate md4 hash of password */ | |
326 | E_md4hash(ses->password, nt_hash); | |
327 | ||
1717ffc5 | 328 | /* convert Domainname to unicode and uppercase */ |
a8ee0344 SF |
329 | hmac_md5_init_limK_to_64(nt_hash, 16, pctxt); |
330 | ||
331 | /* convert ses->userName to unicode and uppercase */ | |
1717ffc5 SF |
332 | len = strlen(ses->userName); |
333 | user = kmalloc(2 + (len * 2), GFP_KERNEL); | |
334 | if(user == NULL) | |
335 | goto calc_exit_2; | |
336 | len = cifs_strtoUCS(user, ses->userName, len, nls_cp); | |
337 | UniStrupr(user); | |
338 | hmac_md5_update((char *)user, 2*len, pctxt); | |
a8ee0344 SF |
339 | |
340 | /* convert ses->domainName to unicode and uppercase */ | |
1717ffc5 SF |
341 | if(ses->domainName) { |
342 | len = strlen(ses->domainName); | |
a8ee0344 | 343 | |
1717ffc5 SF |
344 | domain = kmalloc(2 + (len * 2), GFP_KERNEL); |
345 | if(domain == NULL) | |
346 | goto calc_exit_1; | |
347 | len = cifs_strtoUCS(domain, ses->domainName, len, nls_cp); | |
348 | UniStrupr(domain); | |
a8ee0344 | 349 | |
1717ffc5 SF |
350 | hmac_md5_update((char *)domain, 2*len, pctxt); |
351 | ||
352 | kfree(domain); | |
353 | } | |
354 | calc_exit_1: | |
355 | kfree(user); | |
356 | calc_exit_2: | |
357 | /* BB FIXME what about bytes 24 through 40 of the signing key? | |
358 | compare with the NTLM example */ | |
359 | hmac_md5_final(ses->server->mac_signing_key, pctxt); | |
a8ee0344 SF |
360 | |
361 | return rc; | |
362 | } | |
363 | ||
1717ffc5 SF |
364 | void setup_ntlmv2_rsp(struct cifsSesInfo * ses, char * resp_buf, |
365 | const struct nls_table * nls_cp) | |
6d027cfd | 366 | { |
a8ee0344 | 367 | int rc; |
6d027cfd SF |
368 | struct ntlmv2_resp * buf = (struct ntlmv2_resp *)resp_buf; |
369 | ||
370 | buf->blob_signature = cpu_to_le32(0x00000101); | |
371 | buf->reserved = 0; | |
372 | buf->time = cpu_to_le64(cifs_UnixTimeToNT(CURRENT_TIME)); | |
1717ffc5 | 373 | get_random_bytes(&buf->client_chal, sizeof(buf->client_chal)); |
6d027cfd | 374 | buf->reserved2 = 0; |
33ec32fa | 375 | buf->names[0].type = cpu_to_le16(NTLMSSP_DOMAIN_TYPE); |
6d027cfd | 376 | buf->names[0].length = 0; |
33ec32fa SF |
377 | buf->names[1].type = 0; |
378 | buf->names[1].length = 0; | |
a8ee0344 | 379 | |
6d027cfd | 380 | /* calculate buf->ntlmv2_hash */ |
1717ffc5 | 381 | rc = calc_ntlmv2_hash(ses, nls_cp); |
a8ee0344 SF |
382 | if(rc) |
383 | cERROR(1,("could not get v2 hash rc %d",rc)); | |
1717ffc5 | 384 | CalcNTLMv2_response(ses, resp_buf); |
6d027cfd SF |
385 | } |
386 | ||
1717ffc5 | 387 | void CalcNTLMv2_response(const struct cifsSesInfo * ses, char * v2_session_response) |
1da177e4 LT |
388 | { |
389 | struct HMACMD5Context context; | |
1717ffc5 | 390 | /* rest of v2 struct already generated */ |
1da177e4 | 391 | memcpy(v2_session_response + 8, ses->server->cryptKey,8); |
ad009ac9 | 392 | hmac_md5_init_limK_to_64(ses->server->mac_signing_key, 16, &context); |
1da177e4 | 393 | |
1717ffc5 SF |
394 | hmac_md5_update(v2_session_response+8, |
395 | sizeof(struct ntlmv2_resp) - 8, &context); | |
1da177e4 LT |
396 | |
397 | hmac_md5_final(v2_session_response,&context); | |
1717ffc5 | 398 | /* cifs_dump_mem("v2_sess_rsp: ", v2_session_response, 32); */ |
1da177e4 | 399 | } |