]>
Commit | Line | Data |
---|---|---|
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> |
1da177e4 LT |
30 | |
31 | /* Calculate and return the CIFS signature based on the mac key and the smb pdu */ | |
32 | /* the 16 byte signature must be allocated by the caller */ | |
33 | /* Note we only use the 1st eight bytes */ | |
34 | /* Note that the smb header signature field on input contains the | |
35 | sequence number before this function is called */ | |
36 | ||
37 | extern void mdfour(unsigned char *out, unsigned char *in, int n); | |
38 | extern void E_md4hash(const unsigned char *passwd, unsigned char *p16); | |
7c7b25bc SF |
39 | extern void SMBencrypt(unsigned char *passwd, unsigned char *c8, |
40 | unsigned char *p24); | |
1da177e4 | 41 | |
12b3b8ff SF |
42 | static int cifs_calculate_signature(const struct smb_hdr * cifs_pdu, |
43 | const char * key, char * signature) | |
1da177e4 LT |
44 | { |
45 | struct MD5Context context; | |
46 | ||
47 | if((cifs_pdu == NULL) || (signature == NULL)) | |
48 | return -EINVAL; | |
49 | ||
50 | MD5Init(&context); | |
7c7b25bc | 51 | MD5Update(&context,key,CIFS_SESS_KEY_SIZE+16); |
1da177e4 LT |
52 | MD5Update(&context,cifs_pdu->Protocol,cifs_pdu->smb_buf_length); |
53 | MD5Final(signature,&context); | |
54 | return 0; | |
55 | } | |
56 | ||
ad009ac9 | 57 | int cifs_sign_smb(struct smb_hdr * cifs_pdu, struct TCP_Server_Info * server, |
1da177e4 LT |
58 | __u32 * pexpected_response_sequence_number) |
59 | { | |
60 | int rc = 0; | |
61 | char smb_signature[20]; | |
62 | ||
ad009ac9 | 63 | if((cifs_pdu == NULL) || (server == NULL)) |
1da177e4 LT |
64 | return -EINVAL; |
65 | ||
66 | if((cifs_pdu->Flags2 & SMBFLG2_SECURITY_SIGNATURE) == 0) | |
67 | return rc; | |
68 | ||
69 | spin_lock(&GlobalMid_Lock); | |
ad009ac9 | 70 | cifs_pdu->Signature.Sequence.SequenceNumber = cpu_to_le32(server->sequence_number); |
1da177e4 LT |
71 | cifs_pdu->Signature.Sequence.Reserved = 0; |
72 | ||
ad009ac9 SF |
73 | *pexpected_response_sequence_number = server->sequence_number++; |
74 | server->sequence_number++; | |
1da177e4 LT |
75 | spin_unlock(&GlobalMid_Lock); |
76 | ||
ad009ac9 | 77 | rc = cifs_calculate_signature(cifs_pdu, server->mac_signing_key,smb_signature); |
1da177e4 LT |
78 | if(rc) |
79 | memset(cifs_pdu->Signature.SecuritySignature, 0, 8); | |
80 | else | |
81 | memcpy(cifs_pdu->Signature.SecuritySignature, smb_signature, 8); | |
82 | ||
83 | return rc; | |
84 | } | |
85 | ||
84afc29b SF |
86 | static int cifs_calc_signature2(const struct kvec * iov, int n_vec, |
87 | const char * key, char * signature) | |
88 | { | |
e9917a00 SF |
89 | struct MD5Context context; |
90 | int i; | |
84afc29b | 91 | |
e9917a00 SF |
92 | if((iov == NULL) || (signature == NULL)) |
93 | return -EINVAL; | |
84afc29b | 94 | |
e9917a00 | 95 | MD5Init(&context); |
7c7b25bc | 96 | MD5Update(&context,key,CIFS_SESS_KEY_SIZE+16); |
e9917a00 SF |
97 | for(i=0;i<n_vec;i++) { |
98 | if(iov[i].iov_base == NULL) { | |
99 | cERROR(1,("null iovec entry")); | |
100 | return -EIO; | |
101 | } else if(iov[i].iov_len == 0) | |
102 | break; /* bail out if we are sent nothing to sign */ | |
103 | /* The first entry includes a length field (which does not get | |
104 | signed that occupies the first 4 bytes before the header */ | |
105 | if(i==0) { | |
106 | if (iov[0].iov_len <= 8 ) /* cmd field at offset 9 */ | |
107 | break; /* nothing to sign or corrupt header */ | |
108 | MD5Update(&context,iov[0].iov_base+4, iov[0].iov_len-4); | |
109 | } else | |
110 | MD5Update(&context,iov[i].iov_base, iov[i].iov_len); | |
111 | } | |
84afc29b | 112 | |
e9917a00 | 113 | MD5Final(signature,&context); |
84afc29b | 114 | |
e9917a00 | 115 | return 0; |
84afc29b SF |
116 | } |
117 | ||
118 | ||
119 | int cifs_sign_smb2(struct kvec * iov, int n_vec, struct TCP_Server_Info *server, | |
120 | __u32 * pexpected_response_sequence_number) | |
121 | { | |
122 | int rc = 0; | |
123 | char smb_signature[20]; | |
124 | struct smb_hdr * cifs_pdu = iov[0].iov_base; | |
125 | ||
126 | if((cifs_pdu == NULL) || (server == NULL)) | |
127 | return -EINVAL; | |
128 | ||
129 | if((cifs_pdu->Flags2 & SMBFLG2_SECURITY_SIGNATURE) == 0) | |
130 | return rc; | |
131 | ||
132 | spin_lock(&GlobalMid_Lock); | |
133 | cifs_pdu->Signature.Sequence.SequenceNumber = | |
134 | cpu_to_le32(server->sequence_number); | |
135 | cifs_pdu->Signature.Sequence.Reserved = 0; | |
136 | ||
137 | *pexpected_response_sequence_number = server->sequence_number++; | |
138 | server->sequence_number++; | |
139 | spin_unlock(&GlobalMid_Lock); | |
140 | ||
141 | rc = cifs_calc_signature2(iov, n_vec, server->mac_signing_key, | |
142 | smb_signature); | |
143 | if(rc) | |
144 | memset(cifs_pdu->Signature.SecuritySignature, 0, 8); | |
145 | else | |
146 | memcpy(cifs_pdu->Signature.SecuritySignature, smb_signature, 8); | |
147 | ||
148 | return rc; | |
149 | ||
150 | } | |
151 | ||
1da177e4 LT |
152 | int cifs_verify_signature(struct smb_hdr * cifs_pdu, const char * mac_key, |
153 | __u32 expected_sequence_number) | |
154 | { | |
155 | unsigned int rc; | |
156 | char server_response_sig[8]; | |
157 | char what_we_think_sig_should_be[20]; | |
158 | ||
159 | if((cifs_pdu == NULL) || (mac_key == NULL)) | |
160 | return -EINVAL; | |
161 | ||
162 | if (cifs_pdu->Command == SMB_COM_NEGOTIATE) | |
163 | return 0; | |
164 | ||
165 | if (cifs_pdu->Command == SMB_COM_LOCKING_ANDX) { | |
166 | struct smb_com_lock_req * pSMB = (struct smb_com_lock_req *)cifs_pdu; | |
167 | if(pSMB->LockType & LOCKING_ANDX_OPLOCK_RELEASE) | |
168 | return 0; | |
169 | } | |
170 | ||
171 | /* BB what if signatures are supposed to be on for session but server does not | |
172 | send one? BB */ | |
173 | ||
174 | /* Do not need to verify session setups with signature "BSRSPYL " */ | |
175 | if(memcmp(cifs_pdu->Signature.SecuritySignature,"BSRSPYL ",8)==0) | |
176 | cFYI(1,("dummy signature received for smb command 0x%x",cifs_pdu->Command)); | |
177 | ||
178 | /* save off the origiginal signature so we can modify the smb and check | |
179 | its signature against what the server sent */ | |
180 | memcpy(server_response_sig,cifs_pdu->Signature.SecuritySignature,8); | |
181 | ||
182 | cifs_pdu->Signature.Sequence.SequenceNumber = cpu_to_le32(expected_sequence_number); | |
183 | cifs_pdu->Signature.Sequence.Reserved = 0; | |
184 | ||
185 | rc = cifs_calculate_signature(cifs_pdu, mac_key, | |
186 | what_we_think_sig_should_be); | |
187 | ||
188 | if(rc) | |
189 | return rc; | |
190 | ||
191 | ||
192 | /* cifs_dump_mem("what we think it should be: ",what_we_think_sig_should_be,16); */ | |
193 | ||
194 | if(memcmp(server_response_sig, what_we_think_sig_should_be, 8)) | |
195 | return -EACCES; | |
196 | else | |
197 | return 0; | |
198 | ||
199 | } | |
200 | ||
201 | /* We fill in key by putting in 40 byte array which was allocated by caller */ | |
202 | int cifs_calculate_mac_key(char * key, const char * rn, const char * password) | |
203 | { | |
204 | char temp_key[16]; | |
205 | if ((key == NULL) || (rn == NULL)) | |
206 | return -EINVAL; | |
207 | ||
208 | E_md4hash(password, temp_key); | |
209 | mdfour(key,temp_key,16); | |
7c7b25bc | 210 | memcpy(key+16,rn, CIFS_SESS_KEY_SIZE); |
1da177e4 LT |
211 | return 0; |
212 | } | |
213 | ||
214 | int CalcNTLMv2_partial_mac_key(struct cifsSesInfo * ses, struct nls_table * nls_info) | |
215 | { | |
216 | char temp_hash[16]; | |
217 | struct HMACMD5Context ctx; | |
218 | char * ucase_buf; | |
e89dc920 | 219 | __le16 * unicode_buf; |
1da177e4 LT |
220 | unsigned int i,user_name_len,dom_name_len; |
221 | ||
222 | if(ses == NULL) | |
223 | return -EINVAL; | |
224 | ||
225 | E_md4hash(ses->password, temp_hash); | |
226 | ||
227 | hmac_md5_init_limK_to_64(temp_hash, 16, &ctx); | |
228 | user_name_len = strlen(ses->userName); | |
229 | if(user_name_len > MAX_USERNAME_SIZE) | |
230 | return -EINVAL; | |
3979877e SF |
231 | if(ses->domainName == NULL) |
232 | return -EINVAL; /* BB should we use CIFS_LINUX_DOM */ | |
1da177e4 LT |
233 | dom_name_len = strlen(ses->domainName); |
234 | if(dom_name_len > MAX_USERNAME_SIZE) | |
235 | return -EINVAL; | |
236 | ||
237 | ucase_buf = kmalloc((MAX_USERNAME_SIZE+1), GFP_KERNEL); | |
238 | if(ucase_buf == NULL) | |
239 | return -ENOMEM; | |
240 | unicode_buf = kmalloc((MAX_USERNAME_SIZE+1)*4, GFP_KERNEL); | |
241 | if(unicode_buf == NULL) { | |
242 | kfree(ucase_buf); | |
243 | return -ENOMEM; | |
244 | } | |
245 | ||
246 | for(i=0;i<user_name_len;i++) | |
247 | ucase_buf[i] = nls_info->charset2upper[(int)ses->userName[i]]; | |
248 | ucase_buf[i] = 0; | |
249 | user_name_len = cifs_strtoUCS(unicode_buf, ucase_buf, MAX_USERNAME_SIZE*2, nls_info); | |
250 | unicode_buf[user_name_len] = 0; | |
251 | user_name_len++; | |
252 | ||
253 | for(i=0;i<dom_name_len;i++) | |
254 | ucase_buf[i] = nls_info->charset2upper[(int)ses->domainName[i]]; | |
255 | ucase_buf[i] = 0; | |
256 | dom_name_len = cifs_strtoUCS(unicode_buf+user_name_len, ucase_buf, MAX_USERNAME_SIZE*2, nls_info); | |
257 | ||
258 | unicode_buf[user_name_len + dom_name_len] = 0; | |
259 | hmac_md5_update((const unsigned char *) unicode_buf, | |
260 | (user_name_len+dom_name_len)*2,&ctx); | |
261 | ||
ad009ac9 | 262 | hmac_md5_final(ses->server->mac_signing_key,&ctx); |
1da177e4 LT |
263 | kfree(ucase_buf); |
264 | kfree(unicode_buf); | |
265 | return 0; | |
266 | } | |
7c7b25bc SF |
267 | |
268 | #ifdef CONFIG_CIFS_WEAK_PW_HASH | |
269 | void calc_lanman_hash(struct cifsSesInfo * ses, char * lnm_session_key) | |
270 | { | |
271 | int i; | |
272 | char password_with_pad[CIFS_ENCPWD_SIZE]; | |
273 | ||
274 | memset(password_with_pad, 0, CIFS_ENCPWD_SIZE); | |
275 | strncpy(password_with_pad, ses->password, CIFS_ENCPWD_SIZE); | |
276 | ||
277 | /* calculate old style session key */ | |
278 | /* calling toupper is less broken than repeatedly | |
279 | calling nls_toupper would be since that will never | |
280 | work for UTF8, but neither handles multibyte code pages | |
281 | but the only alternative would be converting to UCS-16 (Unicode) | |
282 | (using a routine something like UniStrupr) then | |
283 | uppercasing and then converting back from Unicode - which | |
284 | would only worth doing it if we knew it were utf8. Basically | |
285 | utf8 and other multibyte codepages each need their own strupper | |
286 | function since a byte at a time will ont work. */ | |
287 | ||
288 | for(i = 0; i < CIFS_ENCPWD_SIZE; i++) { | |
289 | password_with_pad[i] = toupper(password_with_pad[i]); | |
290 | } | |
291 | ||
292 | SMBencrypt(password_with_pad, ses->server->cryptKey, lnm_session_key); | |
293 | /* clear password before we return/free memory */ | |
294 | memset(password_with_pad, 0, CIFS_ENCPWD_SIZE); | |
295 | } | |
296 | #endif /* CIFS_WEAK_PW_HASH */ | |
297 | ||
1da177e4 LT |
298 | void CalcNTLMv2_response(const struct cifsSesInfo * ses,char * v2_session_response) |
299 | { | |
300 | struct HMACMD5Context context; | |
301 | memcpy(v2_session_response + 8, ses->server->cryptKey,8); | |
302 | /* gen_blob(v2_session_response + 16); */ | |
ad009ac9 | 303 | hmac_md5_init_limK_to_64(ses->server->mac_signing_key, 16, &context); |
1da177e4 LT |
304 | |
305 | hmac_md5_update(ses->server->cryptKey,8,&context); | |
306 | /* hmac_md5_update(v2_session_response+16)client thing,8,&context); */ /* BB fix */ | |
307 | ||
308 | hmac_md5_final(v2_session_response,&context); | |
5815449d | 309 | cifs_dump_mem("v2_sess_rsp: ", v2_session_response, 32); /* BB removeme BB */ |
1da177e4 | 310 | } |