2 * fs/cifs/cifsencrypt.c
4 * Copyright (C) International Business Machines Corp., 2003
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"
29 /* Calculate and return the CIFS signature based on the mac key and the smb pdu */
30 /* the 16 byte signature must be allocated by the caller */
31 /* Note we only use the 1st eight bytes */
32 /* Note that the smb header signature field on input contains the
33 sequence number before this function is called */
35 extern void mdfour(unsigned char *out, unsigned char *in, int n);
36 extern void E_md4hash(const unsigned char *passwd, unsigned char *p16);
38 static int cifs_calculate_signature(const struct smb_hdr * cifs_pdu, const char * key, char * signature)
40 struct MD5Context context;
42 if((cifs_pdu == NULL) || (signature == NULL))
46 MD5Update(&context,key,CIFS_SESSION_KEY_SIZE+16);
47 MD5Update(&context,cifs_pdu->Protocol,cifs_pdu->smb_buf_length);
48 MD5Final(signature,&context);
52 int cifs_sign_smb(struct smb_hdr * cifs_pdu, struct cifsSesInfo * ses,
53 __u32 * pexpected_response_sequence_number)
56 char smb_signature[20];
58 /* BB remember to initialize sequence number elsewhere and initialize mac_signing key elsewhere BB */
59 /* BB remember to add code to save expected sequence number in midQ entry BB */
61 if((cifs_pdu == NULL) || (ses == NULL))
64 if((le32_to_cpu(cifs_pdu->Flags2) & SMBFLG2_SECURITY_SIGNATURE) == 0)
67 spin_lock(&GlobalMid_Lock);
68 cifs_pdu->Signature.Sequence.SequenceNumber = cpu_to_le32(ses->sequence_number);
69 cifs_pdu->Signature.Sequence.Reserved = 0;
71 *pexpected_response_sequence_number = ses->sequence_number++;
72 ses->sequence_number++;
73 spin_unlock(&GlobalMid_Lock);
75 rc = cifs_calculate_signature(cifs_pdu, ses->mac_signing_key,smb_signature);
77 memset(cifs_pdu->Signature.SecuritySignature, 0, 8);
79 memcpy(cifs_pdu->Signature.SecuritySignature, smb_signature, 8);
84 int cifs_verify_signature(struct smb_hdr * cifs_pdu, const char * mac_key,
85 __u32 expected_sequence_number)
88 char server_response_sig[8];
89 char what_we_think_sig_should_be[20];
91 if((cifs_pdu == NULL) || (mac_key == NULL))
94 if (cifs_pdu->Command == SMB_COM_NEGOTIATE)
97 if (cifs_pdu->Command == SMB_COM_LOCKING_ANDX) {
98 struct smb_com_lock_req * pSMB = (struct smb_com_lock_req *)cifs_pdu;
99 if(pSMB->LockType & LOCKING_ANDX_OPLOCK_RELEASE)
103 /* BB what if signatures are supposed to be on for session but server does not
106 /* Do not need to verify session setups with signature "BSRSPYL " */
107 if(memcmp(cifs_pdu->Signature.SecuritySignature,"BSRSPYL ",8)==0)
108 cFYI(1,("dummy signature received for smb command 0x%x",cifs_pdu->Command));
110 expected_sequence_number = cpu_to_le32(expected_sequence_number);
112 /* save off the origiginal signature so we can modify the smb and check
113 its signature against what the server sent */
114 memcpy(server_response_sig,cifs_pdu->Signature.SecuritySignature,8);
116 cifs_pdu->Signature.Sequence.SequenceNumber = expected_sequence_number;
117 cifs_pdu->Signature.Sequence.Reserved = 0;
119 rc = cifs_calculate_signature(cifs_pdu, mac_key,
120 what_we_think_sig_should_be);
126 /* cifs_dump_mem("what we think it should be: ",what_we_think_sig_should_be,16); */
128 if(memcmp(server_response_sig, what_we_think_sig_should_be, 8))
135 /* We fill in key by putting in 40 byte array which was allocated by caller */
136 int cifs_calculate_mac_key(char * key, const char * rn, const char * password)
139 if ((key == NULL) || (rn == NULL))
142 E_md4hash(password, temp_key);
143 mdfour(key,temp_key,16);
144 memcpy(key+16,rn, CIFS_SESSION_KEY_SIZE);
148 int CalcNTLMv2_partial_mac_key(struct cifsSesInfo * ses, struct nls_table * nls_info)
151 struct HMACMD5Context ctx;
153 wchar_t * unicode_buf;
154 unsigned int i,user_name_len,dom_name_len;
159 E_md4hash(ses->password, temp_hash);
161 hmac_md5_init_limK_to_64(temp_hash, 16, &ctx);
162 user_name_len = strlen(ses->userName);
163 if(user_name_len > MAX_USERNAME_SIZE)
165 dom_name_len = strlen(ses->domainName);
166 if(dom_name_len > MAX_USERNAME_SIZE)
169 ucase_buf = kmalloc((MAX_USERNAME_SIZE+1), GFP_KERNEL);
170 unicode_buf = kmalloc((MAX_USERNAME_SIZE+1)*4, GFP_KERNEL);
172 for(i=0;i<user_name_len;i++)
173 ucase_buf[i] = nls_info->charset2upper[(int)ses->userName[i]];
175 user_name_len = cifs_strtoUCS(unicode_buf, ucase_buf, MAX_USERNAME_SIZE*2, nls_info);
176 unicode_buf[user_name_len] = 0;
179 for(i=0;i<dom_name_len;i++)
180 ucase_buf[i] = nls_info->charset2upper[(int)ses->domainName[i]];
182 dom_name_len = cifs_strtoUCS(unicode_buf+user_name_len, ucase_buf, MAX_USERNAME_SIZE*2, nls_info);
184 unicode_buf[user_name_len + dom_name_len] = 0;
185 hmac_md5_update((const unsigned char *) unicode_buf,
186 (user_name_len+dom_name_len)*2,&ctx);
188 hmac_md5_final(ses->mac_signing_key,&ctx);
193 void CalcNTLMv2_response(const struct cifsSesInfo * ses,char * v2_session_response)
195 struct HMACMD5Context context;
196 memcpy(v2_session_response + 8, ses->server->cryptKey,8);
197 /* gen_blob(v2_session_response + 16); */
198 hmac_md5_init_limK_to_64(ses->mac_signing_key, 16, &context);
200 hmac_md5_update(ses->server->cryptKey,8,&context);
201 /* hmac_md5_update(v2_session_response+16)client thing,8,&context); */ /* BB fix */
203 hmac_md5_final(v2_session_response,&context);