210 lines
6.5 KiB
C
210 lines
6.5 KiB
C
/*
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* fs/cifs/cifsencrypt.c
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*
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* Copyright (C) International Business Machines Corp., 2003
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* Author(s): Steve French (sfrench@us.ibm.com)
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*
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* This library is free software; you can redistribute it and/or modify
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* it under the terms of the GNU Lesser General Public License as published
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* by the Free Software Foundation; either version 2.1 of the License, or
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* (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
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* the GNU Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with this library; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include <linux/fs.h>
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#include "cifspdu.h"
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#include "cifsglob.h"
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#include "cifs_debug.h"
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#include "md5.h"
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#include "cifs_unicode.h"
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#include "cifsproto.h"
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/* Calculate and return the CIFS signature based on the mac key and the smb pdu */
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/* the 16 byte signature must be allocated by the caller */
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/* Note we only use the 1st eight bytes */
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/* Note that the smb header signature field on input contains the
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sequence number before this function is called */
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extern void mdfour(unsigned char *out, unsigned char *in, int n);
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extern void E_md4hash(const unsigned char *passwd, unsigned char *p16);
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static int cifs_calculate_signature(const struct smb_hdr * cifs_pdu, const char * key, char * signature)
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{
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struct MD5Context context;
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if((cifs_pdu == NULL) || (signature == NULL))
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return -EINVAL;
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MD5Init(&context);
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MD5Update(&context,key,CIFS_SESSION_KEY_SIZE+16);
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MD5Update(&context,cifs_pdu->Protocol,cifs_pdu->smb_buf_length);
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MD5Final(signature,&context);
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return 0;
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}
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int cifs_sign_smb(struct smb_hdr * cifs_pdu, struct TCP_Server_Info * server,
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__u32 * pexpected_response_sequence_number)
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{
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int rc = 0;
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char smb_signature[20];
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/* BB remember to initialize sequence number elsewhere and initialize mac_signing key elsewhere BB */
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/* BB remember to add code to save expected sequence number in midQ entry BB */
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if((cifs_pdu == NULL) || (server == NULL))
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return -EINVAL;
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if((cifs_pdu->Flags2 & SMBFLG2_SECURITY_SIGNATURE) == 0)
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return rc;
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spin_lock(&GlobalMid_Lock);
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cifs_pdu->Signature.Sequence.SequenceNumber = cpu_to_le32(server->sequence_number);
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cifs_pdu->Signature.Sequence.Reserved = 0;
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*pexpected_response_sequence_number = server->sequence_number++;
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server->sequence_number++;
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spin_unlock(&GlobalMid_Lock);
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rc = cifs_calculate_signature(cifs_pdu, server->mac_signing_key,smb_signature);
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if(rc)
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memset(cifs_pdu->Signature.SecuritySignature, 0, 8);
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else
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memcpy(cifs_pdu->Signature.SecuritySignature, smb_signature, 8);
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return rc;
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}
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int cifs_verify_signature(struct smb_hdr * cifs_pdu, const char * mac_key,
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__u32 expected_sequence_number)
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{
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unsigned int rc;
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char server_response_sig[8];
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char what_we_think_sig_should_be[20];
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if((cifs_pdu == NULL) || (mac_key == NULL))
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return -EINVAL;
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if (cifs_pdu->Command == SMB_COM_NEGOTIATE)
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return 0;
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if (cifs_pdu->Command == SMB_COM_LOCKING_ANDX) {
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struct smb_com_lock_req * pSMB = (struct smb_com_lock_req *)cifs_pdu;
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if(pSMB->LockType & LOCKING_ANDX_OPLOCK_RELEASE)
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return 0;
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}
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/* BB what if signatures are supposed to be on for session but server does not
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send one? BB */
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/* Do not need to verify session setups with signature "BSRSPYL " */
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if(memcmp(cifs_pdu->Signature.SecuritySignature,"BSRSPYL ",8)==0)
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cFYI(1,("dummy signature received for smb command 0x%x",cifs_pdu->Command));
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/* save off the origiginal signature so we can modify the smb and check
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its signature against what the server sent */
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memcpy(server_response_sig,cifs_pdu->Signature.SecuritySignature,8);
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cifs_pdu->Signature.Sequence.SequenceNumber = cpu_to_le32(expected_sequence_number);
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cifs_pdu->Signature.Sequence.Reserved = 0;
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rc = cifs_calculate_signature(cifs_pdu, mac_key,
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what_we_think_sig_should_be);
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if(rc)
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return rc;
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/* cifs_dump_mem("what we think it should be: ",what_we_think_sig_should_be,16); */
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if(memcmp(server_response_sig, what_we_think_sig_should_be, 8))
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return -EACCES;
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else
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return 0;
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}
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/* We fill in key by putting in 40 byte array which was allocated by caller */
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int cifs_calculate_mac_key(char * key, const char * rn, const char * password)
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{
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char temp_key[16];
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if ((key == NULL) || (rn == NULL))
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return -EINVAL;
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E_md4hash(password, temp_key);
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mdfour(key,temp_key,16);
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memcpy(key+16,rn, CIFS_SESSION_KEY_SIZE);
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return 0;
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}
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int CalcNTLMv2_partial_mac_key(struct cifsSesInfo * ses, struct nls_table * nls_info)
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{
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char temp_hash[16];
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struct HMACMD5Context ctx;
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char * ucase_buf;
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wchar_t * unicode_buf;
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unsigned int i,user_name_len,dom_name_len;
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if(ses == NULL)
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return -EINVAL;
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E_md4hash(ses->password, temp_hash);
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hmac_md5_init_limK_to_64(temp_hash, 16, &ctx);
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user_name_len = strlen(ses->userName);
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if(user_name_len > MAX_USERNAME_SIZE)
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return -EINVAL;
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dom_name_len = strlen(ses->domainName);
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if(dom_name_len > MAX_USERNAME_SIZE)
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return -EINVAL;
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ucase_buf = kmalloc((MAX_USERNAME_SIZE+1), GFP_KERNEL);
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if(ucase_buf == NULL)
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return -ENOMEM;
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unicode_buf = kmalloc((MAX_USERNAME_SIZE+1)*4, GFP_KERNEL);
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if(unicode_buf == NULL) {
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kfree(ucase_buf);
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return -ENOMEM;
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}
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for(i=0;i<user_name_len;i++)
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ucase_buf[i] = nls_info->charset2upper[(int)ses->userName[i]];
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ucase_buf[i] = 0;
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user_name_len = cifs_strtoUCS(unicode_buf, ucase_buf, MAX_USERNAME_SIZE*2, nls_info);
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unicode_buf[user_name_len] = 0;
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user_name_len++;
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for(i=0;i<dom_name_len;i++)
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ucase_buf[i] = nls_info->charset2upper[(int)ses->domainName[i]];
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ucase_buf[i] = 0;
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dom_name_len = cifs_strtoUCS(unicode_buf+user_name_len, ucase_buf, MAX_USERNAME_SIZE*2, nls_info);
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unicode_buf[user_name_len + dom_name_len] = 0;
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hmac_md5_update((const unsigned char *) unicode_buf,
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(user_name_len+dom_name_len)*2,&ctx);
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hmac_md5_final(ses->server->mac_signing_key,&ctx);
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kfree(ucase_buf);
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kfree(unicode_buf);
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return 0;
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}
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void CalcNTLMv2_response(const struct cifsSesInfo * ses,char * v2_session_response)
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{
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struct HMACMD5Context context;
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memcpy(v2_session_response + 8, ses->server->cryptKey,8);
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/* gen_blob(v2_session_response + 16); */
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hmac_md5_init_limK_to_64(ses->server->mac_signing_key, 16, &context);
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hmac_md5_update(ses->server->cryptKey,8,&context);
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/* hmac_md5_update(v2_session_response+16)client thing,8,&context); */ /* BB fix */
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hmac_md5_final(v2_session_response,&context);
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}
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