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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" | |
29 | ||
30 | /* Calculate and return the CIFS signature based on the mac key and the smb pdu */ | |
31 | /* the 16 byte signature must be allocated by the caller */ | |
32 | /* Note we only use the 1st eight bytes */ | |
33 | /* Note that the smb header signature field on input contains the | |
34 | sequence number before this function is called */ | |
35 | ||
36 | extern void mdfour(unsigned char *out, unsigned char *in, int n); | |
37 | extern void E_md4hash(const unsigned char *passwd, unsigned char *p16); | |
38 | ||
12b3b8ff SF |
39 | static int cifs_calculate_signature(const struct smb_hdr * cifs_pdu, |
40 | const char * key, char * signature) | |
1da177e4 LT |
41 | { |
42 | struct MD5Context context; | |
43 | ||
44 | if((cifs_pdu == NULL) || (signature == NULL)) | |
45 | return -EINVAL; | |
46 | ||
47 | MD5Init(&context); | |
48 | MD5Update(&context,key,CIFS_SESSION_KEY_SIZE+16); | |
49 | MD5Update(&context,cifs_pdu->Protocol,cifs_pdu->smb_buf_length); | |
50 | MD5Final(signature,&context); | |
51 | return 0; | |
52 | } | |
53 | ||
ad009ac9 | 54 | int cifs_sign_smb(struct smb_hdr * cifs_pdu, struct TCP_Server_Info * server, |
1da177e4 LT |
55 | __u32 * pexpected_response_sequence_number) |
56 | { | |
57 | int rc = 0; | |
58 | char smb_signature[20]; | |
59 | ||
ad009ac9 | 60 | if((cifs_pdu == NULL) || (server == NULL)) |
1da177e4 LT |
61 | return -EINVAL; |
62 | ||
63 | if((cifs_pdu->Flags2 & SMBFLG2_SECURITY_SIGNATURE) == 0) | |
64 | return rc; | |
65 | ||
66 | spin_lock(&GlobalMid_Lock); | |
ad009ac9 | 67 | cifs_pdu->Signature.Sequence.SequenceNumber = cpu_to_le32(server->sequence_number); |
1da177e4 LT |
68 | cifs_pdu->Signature.Sequence.Reserved = 0; |
69 | ||
ad009ac9 SF |
70 | *pexpected_response_sequence_number = server->sequence_number++; |
71 | server->sequence_number++; | |
1da177e4 LT |
72 | spin_unlock(&GlobalMid_Lock); |
73 | ||
ad009ac9 | 74 | rc = cifs_calculate_signature(cifs_pdu, server->mac_signing_key,smb_signature); |
1da177e4 LT |
75 | if(rc) |
76 | memset(cifs_pdu->Signature.SecuritySignature, 0, 8); | |
77 | else | |
78 | memcpy(cifs_pdu->Signature.SecuritySignature, smb_signature, 8); | |
79 | ||
80 | return rc; | |
81 | } | |
82 | ||
84afc29b SF |
83 | static int cifs_calc_signature2(const struct kvec * iov, int n_vec, |
84 | const char * key, char * signature) | |
85 | { | |
e9917a00 SF |
86 | struct MD5Context context; |
87 | int i; | |
84afc29b | 88 | |
e9917a00 SF |
89 | if((iov == NULL) || (signature == NULL)) |
90 | return -EINVAL; | |
84afc29b | 91 | |
e9917a00 SF |
92 | MD5Init(&context); |
93 | MD5Update(&context,key,CIFS_SESSION_KEY_SIZE+16); | |
94 | for(i=0;i<n_vec;i++) { | |
95 | if(iov[i].iov_base == NULL) { | |
96 | cERROR(1,("null iovec entry")); | |
97 | return -EIO; | |
98 | } else if(iov[i].iov_len == 0) | |
99 | break; /* bail out if we are sent nothing to sign */ | |
100 | /* The first entry includes a length field (which does not get | |
101 | signed that occupies the first 4 bytes before the header */ | |
102 | if(i==0) { | |
103 | if (iov[0].iov_len <= 8 ) /* cmd field at offset 9 */ | |
104 | break; /* nothing to sign or corrupt header */ | |
105 | MD5Update(&context,iov[0].iov_base+4, iov[0].iov_len-4); | |
106 | } else | |
107 | MD5Update(&context,iov[i].iov_base, iov[i].iov_len); | |
108 | } | |
84afc29b | 109 | |
e9917a00 | 110 | MD5Final(signature,&context); |
84afc29b | 111 | |
e9917a00 | 112 | return 0; |
84afc29b SF |
113 | } |
114 | ||
115 | ||
116 | int cifs_sign_smb2(struct kvec * iov, int n_vec, struct TCP_Server_Info *server, | |
117 | __u32 * pexpected_response_sequence_number) | |
118 | { | |
119 | int rc = 0; | |
120 | char smb_signature[20]; | |
121 | struct smb_hdr * cifs_pdu = iov[0].iov_base; | |
122 | ||
123 | if((cifs_pdu == NULL) || (server == NULL)) | |
124 | return -EINVAL; | |
125 | ||
126 | if((cifs_pdu->Flags2 & SMBFLG2_SECURITY_SIGNATURE) == 0) | |
127 | return rc; | |
128 | ||
129 | spin_lock(&GlobalMid_Lock); | |
130 | cifs_pdu->Signature.Sequence.SequenceNumber = | |
131 | cpu_to_le32(server->sequence_number); | |
132 | cifs_pdu->Signature.Sequence.Reserved = 0; | |
133 | ||
134 | *pexpected_response_sequence_number = server->sequence_number++; | |
135 | server->sequence_number++; | |
136 | spin_unlock(&GlobalMid_Lock); | |
137 | ||
138 | rc = cifs_calc_signature2(iov, n_vec, server->mac_signing_key, | |
139 | smb_signature); | |
140 | if(rc) | |
141 | memset(cifs_pdu->Signature.SecuritySignature, 0, 8); | |
142 | else | |
143 | memcpy(cifs_pdu->Signature.SecuritySignature, smb_signature, 8); | |
144 | ||
145 | return rc; | |
146 | ||
147 | } | |
148 | ||
1da177e4 LT |
149 | int cifs_verify_signature(struct smb_hdr * cifs_pdu, const char * mac_key, |
150 | __u32 expected_sequence_number) | |
151 | { | |
152 | unsigned int rc; | |
153 | char server_response_sig[8]; | |
154 | char what_we_think_sig_should_be[20]; | |
155 | ||
156 | if((cifs_pdu == NULL) || (mac_key == NULL)) | |
157 | return -EINVAL; | |
158 | ||
159 | if (cifs_pdu->Command == SMB_COM_NEGOTIATE) | |
160 | return 0; | |
161 | ||
162 | if (cifs_pdu->Command == SMB_COM_LOCKING_ANDX) { | |
163 | struct smb_com_lock_req * pSMB = (struct smb_com_lock_req *)cifs_pdu; | |
164 | if(pSMB->LockType & LOCKING_ANDX_OPLOCK_RELEASE) | |
165 | return 0; | |
166 | } | |
167 | ||
168 | /* BB what if signatures are supposed to be on for session but server does not | |
169 | send one? BB */ | |
170 | ||
171 | /* Do not need to verify session setups with signature "BSRSPYL " */ | |
172 | if(memcmp(cifs_pdu->Signature.SecuritySignature,"BSRSPYL ",8)==0) | |
173 | cFYI(1,("dummy signature received for smb command 0x%x",cifs_pdu->Command)); | |
174 | ||
175 | /* save off the origiginal signature so we can modify the smb and check | |
176 | its signature against what the server sent */ | |
177 | memcpy(server_response_sig,cifs_pdu->Signature.SecuritySignature,8); | |
178 | ||
179 | cifs_pdu->Signature.Sequence.SequenceNumber = cpu_to_le32(expected_sequence_number); | |
180 | cifs_pdu->Signature.Sequence.Reserved = 0; | |
181 | ||
182 | rc = cifs_calculate_signature(cifs_pdu, mac_key, | |
183 | what_we_think_sig_should_be); | |
184 | ||
185 | if(rc) | |
186 | return rc; | |
187 | ||
188 | ||
189 | /* cifs_dump_mem("what we think it should be: ",what_we_think_sig_should_be,16); */ | |
190 | ||
191 | if(memcmp(server_response_sig, what_we_think_sig_should_be, 8)) | |
192 | return -EACCES; | |
193 | else | |
194 | return 0; | |
195 | ||
196 | } | |
197 | ||
198 | /* We fill in key by putting in 40 byte array which was allocated by caller */ | |
199 | int cifs_calculate_mac_key(char * key, const char * rn, const char * password) | |
200 | { | |
201 | char temp_key[16]; | |
202 | if ((key == NULL) || (rn == NULL)) | |
203 | return -EINVAL; | |
204 | ||
205 | E_md4hash(password, temp_key); | |
206 | mdfour(key,temp_key,16); | |
207 | memcpy(key+16,rn, CIFS_SESSION_KEY_SIZE); | |
208 | return 0; | |
209 | } | |
210 | ||
211 | int CalcNTLMv2_partial_mac_key(struct cifsSesInfo * ses, struct nls_table * nls_info) | |
212 | { | |
213 | char temp_hash[16]; | |
214 | struct HMACMD5Context ctx; | |
215 | char * ucase_buf; | |
e89dc920 | 216 | __le16 * unicode_buf; |
1da177e4 LT |
217 | unsigned int i,user_name_len,dom_name_len; |
218 | ||
219 | if(ses == NULL) | |
220 | return -EINVAL; | |
221 | ||
222 | E_md4hash(ses->password, temp_hash); | |
223 | ||
224 | hmac_md5_init_limK_to_64(temp_hash, 16, &ctx); | |
225 | user_name_len = strlen(ses->userName); | |
226 | if(user_name_len > MAX_USERNAME_SIZE) | |
227 | return -EINVAL; | |
228 | dom_name_len = strlen(ses->domainName); | |
229 | if(dom_name_len > MAX_USERNAME_SIZE) | |
230 | return -EINVAL; | |
231 | ||
232 | ucase_buf = kmalloc((MAX_USERNAME_SIZE+1), GFP_KERNEL); | |
233 | if(ucase_buf == NULL) | |
234 | return -ENOMEM; | |
235 | unicode_buf = kmalloc((MAX_USERNAME_SIZE+1)*4, GFP_KERNEL); | |
236 | if(unicode_buf == NULL) { | |
237 | kfree(ucase_buf); | |
238 | return -ENOMEM; | |
239 | } | |
240 | ||
241 | for(i=0;i<user_name_len;i++) | |
242 | ucase_buf[i] = nls_info->charset2upper[(int)ses->userName[i]]; | |
243 | ucase_buf[i] = 0; | |
244 | user_name_len = cifs_strtoUCS(unicode_buf, ucase_buf, MAX_USERNAME_SIZE*2, nls_info); | |
245 | unicode_buf[user_name_len] = 0; | |
246 | user_name_len++; | |
247 | ||
248 | for(i=0;i<dom_name_len;i++) | |
249 | ucase_buf[i] = nls_info->charset2upper[(int)ses->domainName[i]]; | |
250 | ucase_buf[i] = 0; | |
251 | dom_name_len = cifs_strtoUCS(unicode_buf+user_name_len, ucase_buf, MAX_USERNAME_SIZE*2, nls_info); | |
252 | ||
253 | unicode_buf[user_name_len + dom_name_len] = 0; | |
254 | hmac_md5_update((const unsigned char *) unicode_buf, | |
255 | (user_name_len+dom_name_len)*2,&ctx); | |
256 | ||
ad009ac9 | 257 | hmac_md5_final(ses->server->mac_signing_key,&ctx); |
1da177e4 LT |
258 | kfree(ucase_buf); |
259 | kfree(unicode_buf); | |
260 | return 0; | |
261 | } | |
262 | void CalcNTLMv2_response(const struct cifsSesInfo * ses,char * v2_session_response) | |
263 | { | |
264 | struct HMACMD5Context context; | |
265 | memcpy(v2_session_response + 8, ses->server->cryptKey,8); | |
266 | /* gen_blob(v2_session_response + 16); */ | |
ad009ac9 | 267 | hmac_md5_init_limK_to_64(ses->server->mac_signing_key, 16, &context); |
1da177e4 LT |
268 | |
269 | hmac_md5_update(ses->server->cryptKey,8,&context); | |
270 | /* hmac_md5_update(v2_session_response+16)client thing,8,&context); */ /* BB fix */ | |
271 | ||
272 | hmac_md5_final(v2_session_response,&context); | |
5815449d | 273 | cifs_dump_mem("v2_sess_rsp: ", v2_session_response, 32); /* BB removeme BB */ |
1da177e4 | 274 | } |