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CommitLineData
1da177e4
LT
1/*
2 * fs/cifs/cifsencrypt.c
3 *
12b3b8ff 4 * Copyright (C) International Business Machines Corp., 2005,2006
1da177e4
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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
36extern void mdfour(unsigned char *out, unsigned char *in, int n);
37extern void E_md4hash(const unsigned char *passwd, unsigned char *p16);
38
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SF
39static int cifs_calculate_signature(const struct smb_hdr * cifs_pdu,
40 const char * key, char * signature)
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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 54int cifs_sign_smb(struct smb_hdr * cifs_pdu, struct TCP_Server_Info * server,
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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
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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);
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68 cifs_pdu->Signature.Sequence.Reserved = 0;
69
ad009ac9
SF
70 *pexpected_response_sequence_number = server->sequence_number++;
71 server->sequence_number++;
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72 spin_unlock(&GlobalMid_Lock);
73
ad009ac9 74 rc = cifs_calculate_signature(cifs_pdu, server->mac_signing_key,smb_signature);
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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
83static 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
116int 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
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149int 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 */
199int 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
211int 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;
3979877e
SF
228 if(ses->domainName == NULL)
229 return -EINVAL; /* BB should we use CIFS_LINUX_DOM */
1da177e4
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230 dom_name_len = strlen(ses->domainName);
231 if(dom_name_len > MAX_USERNAME_SIZE)
232 return -EINVAL;
233
234 ucase_buf = kmalloc((MAX_USERNAME_SIZE+1), GFP_KERNEL);
235 if(ucase_buf == NULL)
236 return -ENOMEM;
237 unicode_buf = kmalloc((MAX_USERNAME_SIZE+1)*4, GFP_KERNEL);
238 if(unicode_buf == NULL) {
239 kfree(ucase_buf);
240 return -ENOMEM;
241 }
242
243 for(i=0;i<user_name_len;i++)
244 ucase_buf[i] = nls_info->charset2upper[(int)ses->userName[i]];
245 ucase_buf[i] = 0;
246 user_name_len = cifs_strtoUCS(unicode_buf, ucase_buf, MAX_USERNAME_SIZE*2, nls_info);
247 unicode_buf[user_name_len] = 0;
248 user_name_len++;
249
250 for(i=0;i<dom_name_len;i++)
251 ucase_buf[i] = nls_info->charset2upper[(int)ses->domainName[i]];
252 ucase_buf[i] = 0;
253 dom_name_len = cifs_strtoUCS(unicode_buf+user_name_len, ucase_buf, MAX_USERNAME_SIZE*2, nls_info);
254
255 unicode_buf[user_name_len + dom_name_len] = 0;
256 hmac_md5_update((const unsigned char *) unicode_buf,
257 (user_name_len+dom_name_len)*2,&ctx);
258
ad009ac9 259 hmac_md5_final(ses->server->mac_signing_key,&ctx);
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260 kfree(ucase_buf);
261 kfree(unicode_buf);
262 return 0;
263}
264void CalcNTLMv2_response(const struct cifsSesInfo * ses,char * v2_session_response)
265{
266 struct HMACMD5Context context;
267 memcpy(v2_session_response + 8, ses->server->cryptKey,8);
268 /* gen_blob(v2_session_response + 16); */
ad009ac9 269 hmac_md5_init_limK_to_64(ses->server->mac_signing_key, 16, &context);
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270
271 hmac_md5_update(ses->server->cryptKey,8,&context);
272/* hmac_md5_update(v2_session_response+16)client thing,8,&context); */ /* BB fix */
273
274 hmac_md5_final(v2_session_response,&context);
5815449d 275 cifs_dump_mem("v2_sess_rsp: ", v2_session_response, 32); /* BB removeme BB */
1da177e4 276}