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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 | ||
60 | /* BB remember to initialize sequence number elsewhere and initialize mac_signing key elsewhere BB */ | |
61 | /* BB remember to add code to save expected sequence number in midQ entry BB */ | |
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 | { | |
89 | struct MD5Context context; | |
90 | ||
91 | if((iov == NULL) || (signature == NULL)) | |
92 | return -EINVAL; | |
93 | ||
94 | MD5Init(&context); | |
95 | MD5Update(&context,key,CIFS_SESSION_KEY_SIZE+16); | |
96 | ||
97 | /* MD5Update(&context,cifs_pdu->Protocol,cifs_pdu->smb_buf_length); */ /* BB FIXME BB */ | |
98 | ||
99 | MD5Final(signature,&context); | |
100 | ||
101 | return -EOPNOTSUPP; | |
102 | /* return 0; */ | |
103 | } | |
104 | ||
105 | ||
106 | int cifs_sign_smb2(struct kvec * iov, int n_vec, struct TCP_Server_Info *server, | |
107 | __u32 * pexpected_response_sequence_number) | |
108 | { | |
109 | int rc = 0; | |
110 | char smb_signature[20]; | |
111 | struct smb_hdr * cifs_pdu = iov[0].iov_base; | |
112 | ||
113 | if((cifs_pdu == NULL) || (server == NULL)) | |
114 | return -EINVAL; | |
115 | ||
116 | if((cifs_pdu->Flags2 & SMBFLG2_SECURITY_SIGNATURE) == 0) | |
117 | return rc; | |
118 | ||
119 | spin_lock(&GlobalMid_Lock); | |
120 | cifs_pdu->Signature.Sequence.SequenceNumber = | |
121 | cpu_to_le32(server->sequence_number); | |
122 | cifs_pdu->Signature.Sequence.Reserved = 0; | |
123 | ||
124 | *pexpected_response_sequence_number = server->sequence_number++; | |
125 | server->sequence_number++; | |
126 | spin_unlock(&GlobalMid_Lock); | |
127 | ||
128 | rc = cifs_calc_signature2(iov, n_vec, server->mac_signing_key, | |
129 | smb_signature); | |
130 | if(rc) | |
131 | memset(cifs_pdu->Signature.SecuritySignature, 0, 8); | |
132 | else | |
133 | memcpy(cifs_pdu->Signature.SecuritySignature, smb_signature, 8); | |
134 | ||
135 | return rc; | |
136 | ||
137 | } | |
138 | ||
1da177e4 LT |
139 | int cifs_verify_signature(struct smb_hdr * cifs_pdu, const char * mac_key, |
140 | __u32 expected_sequence_number) | |
141 | { | |
142 | unsigned int rc; | |
143 | char server_response_sig[8]; | |
144 | char what_we_think_sig_should_be[20]; | |
145 | ||
146 | if((cifs_pdu == NULL) || (mac_key == NULL)) | |
147 | return -EINVAL; | |
148 | ||
149 | if (cifs_pdu->Command == SMB_COM_NEGOTIATE) | |
150 | return 0; | |
151 | ||
152 | if (cifs_pdu->Command == SMB_COM_LOCKING_ANDX) { | |
153 | struct smb_com_lock_req * pSMB = (struct smb_com_lock_req *)cifs_pdu; | |
154 | if(pSMB->LockType & LOCKING_ANDX_OPLOCK_RELEASE) | |
155 | return 0; | |
156 | } | |
157 | ||
158 | /* BB what if signatures are supposed to be on for session but server does not | |
159 | send one? BB */ | |
160 | ||
161 | /* Do not need to verify session setups with signature "BSRSPYL " */ | |
162 | if(memcmp(cifs_pdu->Signature.SecuritySignature,"BSRSPYL ",8)==0) | |
163 | cFYI(1,("dummy signature received for smb command 0x%x",cifs_pdu->Command)); | |
164 | ||
165 | /* save off the origiginal signature so we can modify the smb and check | |
166 | its signature against what the server sent */ | |
167 | memcpy(server_response_sig,cifs_pdu->Signature.SecuritySignature,8); | |
168 | ||
169 | cifs_pdu->Signature.Sequence.SequenceNumber = cpu_to_le32(expected_sequence_number); | |
170 | cifs_pdu->Signature.Sequence.Reserved = 0; | |
171 | ||
172 | rc = cifs_calculate_signature(cifs_pdu, mac_key, | |
173 | what_we_think_sig_should_be); | |
174 | ||
175 | if(rc) | |
176 | return rc; | |
177 | ||
178 | ||
179 | /* cifs_dump_mem("what we think it should be: ",what_we_think_sig_should_be,16); */ | |
180 | ||
181 | if(memcmp(server_response_sig, what_we_think_sig_should_be, 8)) | |
182 | return -EACCES; | |
183 | else | |
184 | return 0; | |
185 | ||
186 | } | |
187 | ||
188 | /* We fill in key by putting in 40 byte array which was allocated by caller */ | |
189 | int cifs_calculate_mac_key(char * key, const char * rn, const char * password) | |
190 | { | |
191 | char temp_key[16]; | |
192 | if ((key == NULL) || (rn == NULL)) | |
193 | return -EINVAL; | |
194 | ||
195 | E_md4hash(password, temp_key); | |
196 | mdfour(key,temp_key,16); | |
197 | memcpy(key+16,rn, CIFS_SESSION_KEY_SIZE); | |
198 | return 0; | |
199 | } | |
200 | ||
201 | int CalcNTLMv2_partial_mac_key(struct cifsSesInfo * ses, struct nls_table * nls_info) | |
202 | { | |
203 | char temp_hash[16]; | |
204 | struct HMACMD5Context ctx; | |
205 | char * ucase_buf; | |
e89dc920 | 206 | __le16 * unicode_buf; |
1da177e4 LT |
207 | unsigned int i,user_name_len,dom_name_len; |
208 | ||
209 | if(ses == NULL) | |
210 | return -EINVAL; | |
211 | ||
212 | E_md4hash(ses->password, temp_hash); | |
213 | ||
214 | hmac_md5_init_limK_to_64(temp_hash, 16, &ctx); | |
215 | user_name_len = strlen(ses->userName); | |
216 | if(user_name_len > MAX_USERNAME_SIZE) | |
217 | return -EINVAL; | |
218 | dom_name_len = strlen(ses->domainName); | |
219 | if(dom_name_len > MAX_USERNAME_SIZE) | |
220 | return -EINVAL; | |
221 | ||
222 | ucase_buf = kmalloc((MAX_USERNAME_SIZE+1), GFP_KERNEL); | |
223 | if(ucase_buf == NULL) | |
224 | return -ENOMEM; | |
225 | unicode_buf = kmalloc((MAX_USERNAME_SIZE+1)*4, GFP_KERNEL); | |
226 | if(unicode_buf == NULL) { | |
227 | kfree(ucase_buf); | |
228 | return -ENOMEM; | |
229 | } | |
230 | ||
231 | for(i=0;i<user_name_len;i++) | |
232 | ucase_buf[i] = nls_info->charset2upper[(int)ses->userName[i]]; | |
233 | ucase_buf[i] = 0; | |
234 | user_name_len = cifs_strtoUCS(unicode_buf, ucase_buf, MAX_USERNAME_SIZE*2, nls_info); | |
235 | unicode_buf[user_name_len] = 0; | |
236 | user_name_len++; | |
237 | ||
238 | for(i=0;i<dom_name_len;i++) | |
239 | ucase_buf[i] = nls_info->charset2upper[(int)ses->domainName[i]]; | |
240 | ucase_buf[i] = 0; | |
241 | dom_name_len = cifs_strtoUCS(unicode_buf+user_name_len, ucase_buf, MAX_USERNAME_SIZE*2, nls_info); | |
242 | ||
243 | unicode_buf[user_name_len + dom_name_len] = 0; | |
244 | hmac_md5_update((const unsigned char *) unicode_buf, | |
245 | (user_name_len+dom_name_len)*2,&ctx); | |
246 | ||
ad009ac9 | 247 | hmac_md5_final(ses->server->mac_signing_key,&ctx); |
1da177e4 LT |
248 | kfree(ucase_buf); |
249 | kfree(unicode_buf); | |
250 | return 0; | |
251 | } | |
252 | void CalcNTLMv2_response(const struct cifsSesInfo * ses,char * v2_session_response) | |
253 | { | |
254 | struct HMACMD5Context context; | |
255 | memcpy(v2_session_response + 8, ses->server->cryptKey,8); | |
256 | /* gen_blob(v2_session_response + 16); */ | |
ad009ac9 | 257 | hmac_md5_init_limK_to_64(ses->server->mac_signing_key, 16, &context); |
1da177e4 LT |
258 | |
259 | hmac_md5_update(ses->server->cryptKey,8,&context); | |
260 | /* hmac_md5_update(v2_session_response+16)client thing,8,&context); */ /* BB fix */ | |
261 | ||
262 | hmac_md5_final(v2_session_response,&context); | |
263 | } |