2 * fs/cifs/cifsencrypt.c
4 * Copyright (C) International Business Machines Corp., 2005
5 * Author(s): Steve French (sfrench@us.ibm.com)
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.
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.
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
25 #include "cifs_debug.h"
27 #include "cifs_unicode.h"
28 #include "cifsproto.h"
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 */
36 extern void mdfour(unsigned char *out, unsigned char *in, int n);
37 extern void E_md4hash(const unsigned char *passwd, unsigned char *p16);
39 static int cifs_calculate_signature(const struct smb_hdr * cifs_pdu, const char * key, char * signature)
41 struct MD5Context context;
43 if((cifs_pdu == NULL) || (signature == NULL))
47 MD5Update(&context,key,CIFS_SESSION_KEY_SIZE+16);
48 MD5Update(&context,cifs_pdu->Protocol,cifs_pdu->smb_buf_length);
49 MD5Final(signature,&context);
53 int cifs_sign_smb(struct smb_hdr * cifs_pdu, struct TCP_Server_Info * server,
54 __u32 * pexpected_response_sequence_number)
57 char smb_signature[20];
59 if((cifs_pdu == NULL) || (server == NULL))
62 if((cifs_pdu->Flags2 & SMBFLG2_SECURITY_SIGNATURE) == 0)
65 spin_lock(&GlobalMid_Lock);
66 cifs_pdu->Signature.Sequence.SequenceNumber = cpu_to_le32(server->sequence_number);
67 cifs_pdu->Signature.Sequence.Reserved = 0;
69 *pexpected_response_sequence_number = server->sequence_number++;
70 server->sequence_number++;
71 spin_unlock(&GlobalMid_Lock);
73 rc = cifs_calculate_signature(cifs_pdu, server->mac_signing_key,smb_signature);
75 memset(cifs_pdu->Signature.SecuritySignature, 0, 8);
77 memcpy(cifs_pdu->Signature.SecuritySignature, smb_signature, 8);
82 static int cifs_calc_signature2(const struct kvec * iov, int n_vec,
83 const char * key, char * signature)
85 struct MD5Context context;
88 if((iov == NULL) || (signature == NULL))
92 MD5Update(&context,key,CIFS_SESSION_KEY_SIZE+16);
93 for(i=0;i<n_vec;i++) {
94 if(iov[i].iov_base == NULL) {
95 cERROR(1,("null iovec entry"));
97 } else if(iov[i].iov_len == 0)
98 break; /* bail out if we are sent nothing to sign */
99 /* The first entry includes a length field (which does not get
100 signed that occupies the first 4 bytes before the header */
102 if (iov[0].iov_len <= 8 ) /* cmd field at offset 9 */
103 break; /* nothing to sign or corrupt header */
104 MD5Update(&context,iov[0].iov_base+4, iov[0].iov_len-4);
106 MD5Update(&context,iov[i].iov_base, iov[i].iov_len);
109 MD5Final(signature,&context);
115 int cifs_sign_smb2(struct kvec * iov, int n_vec, struct TCP_Server_Info *server,
116 __u32 * pexpected_response_sequence_number)
119 char smb_signature[20];
120 struct smb_hdr * cifs_pdu = iov[0].iov_base;
122 if((cifs_pdu == NULL) || (server == NULL))
125 if((cifs_pdu->Flags2 & SMBFLG2_SECURITY_SIGNATURE) == 0)
128 spin_lock(&GlobalMid_Lock);
129 cifs_pdu->Signature.Sequence.SequenceNumber =
130 cpu_to_le32(server->sequence_number);
131 cifs_pdu->Signature.Sequence.Reserved = 0;
133 *pexpected_response_sequence_number = server->sequence_number++;
134 server->sequence_number++;
135 spin_unlock(&GlobalMid_Lock);
137 rc = cifs_calc_signature2(iov, n_vec, server->mac_signing_key,
140 memset(cifs_pdu->Signature.SecuritySignature, 0, 8);
142 memcpy(cifs_pdu->Signature.SecuritySignature, smb_signature, 8);
148 int cifs_verify_signature(struct smb_hdr * cifs_pdu, const char * mac_key,
149 __u32 expected_sequence_number)
152 char server_response_sig[8];
153 char what_we_think_sig_should_be[20];
155 if((cifs_pdu == NULL) || (mac_key == NULL))
158 if (cifs_pdu->Command == SMB_COM_NEGOTIATE)
161 if (cifs_pdu->Command == SMB_COM_LOCKING_ANDX) {
162 struct smb_com_lock_req * pSMB = (struct smb_com_lock_req *)cifs_pdu;
163 if(pSMB->LockType & LOCKING_ANDX_OPLOCK_RELEASE)
167 /* BB what if signatures are supposed to be on for session but server does not
170 /* Do not need to verify session setups with signature "BSRSPYL " */
171 if(memcmp(cifs_pdu->Signature.SecuritySignature,"BSRSPYL ",8)==0)
172 cFYI(1,("dummy signature received for smb command 0x%x",cifs_pdu->Command));
174 /* save off the origiginal signature so we can modify the smb and check
175 its signature against what the server sent */
176 memcpy(server_response_sig,cifs_pdu->Signature.SecuritySignature,8);
178 cifs_pdu->Signature.Sequence.SequenceNumber = cpu_to_le32(expected_sequence_number);
179 cifs_pdu->Signature.Sequence.Reserved = 0;
181 rc = cifs_calculate_signature(cifs_pdu, mac_key,
182 what_we_think_sig_should_be);
188 /* cifs_dump_mem("what we think it should be: ",what_we_think_sig_should_be,16); */
190 if(memcmp(server_response_sig, what_we_think_sig_should_be, 8))
197 /* We fill in key by putting in 40 byte array which was allocated by caller */
198 int cifs_calculate_mac_key(char * key, const char * rn, const char * password)
201 if ((key == NULL) || (rn == NULL))
204 E_md4hash(password, temp_key);
205 mdfour(key,temp_key,16);
206 memcpy(key+16,rn, CIFS_SESSION_KEY_SIZE);
210 int CalcNTLMv2_partial_mac_key(struct cifsSesInfo * ses, struct nls_table * nls_info)
213 struct HMACMD5Context ctx;
215 __le16 * unicode_buf;
216 unsigned int i,user_name_len,dom_name_len;
221 E_md4hash(ses->password, temp_hash);
223 hmac_md5_init_limK_to_64(temp_hash, 16, &ctx);
224 user_name_len = strlen(ses->userName);
225 if(user_name_len > MAX_USERNAME_SIZE)
227 dom_name_len = strlen(ses->domainName);
228 if(dom_name_len > MAX_USERNAME_SIZE)
231 ucase_buf = kmalloc((MAX_USERNAME_SIZE+1), GFP_KERNEL);
232 if(ucase_buf == NULL)
234 unicode_buf = kmalloc((MAX_USERNAME_SIZE+1)*4, GFP_KERNEL);
235 if(unicode_buf == NULL) {
240 for(i=0;i<user_name_len;i++)
241 ucase_buf[i] = nls_info->charset2upper[(int)ses->userName[i]];
243 user_name_len = cifs_strtoUCS(unicode_buf, ucase_buf, MAX_USERNAME_SIZE*2, nls_info);
244 unicode_buf[user_name_len] = 0;
247 for(i=0;i<dom_name_len;i++)
248 ucase_buf[i] = nls_info->charset2upper[(int)ses->domainName[i]];
250 dom_name_len = cifs_strtoUCS(unicode_buf+user_name_len, ucase_buf, MAX_USERNAME_SIZE*2, nls_info);
252 unicode_buf[user_name_len + dom_name_len] = 0;
253 hmac_md5_update((const unsigned char *) unicode_buf,
254 (user_name_len+dom_name_len)*2,&ctx);
256 hmac_md5_final(ses->server->mac_signing_key,&ctx);
261 void CalcNTLMv2_response(const struct cifsSesInfo * ses,char * v2_session_response)
263 struct HMACMD5Context context;
264 memcpy(v2_session_response + 8, ses->server->cryptKey,8);
265 /* gen_blob(v2_session_response + 16); */
266 hmac_md5_init_limK_to_64(ses->server->mac_signing_key, 16, &context);
268 hmac_md5_update(ses->server->cryptKey,8,&context);
269 /* hmac_md5_update(v2_session_response+16)client thing,8,&context); */ /* BB fix */
271 hmac_md5_final(v2_session_response,&context);