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![Steve French](/assets/img/avatar_default.png)
The cifs session setup code has three cases, and a fourth for backlevel LANMAN2 style session setup needed to be added. This new session setup implmentation will eventually replace the other three and should be easier to read while fixing a few minor problems (not setting the LARGE READ/WRITEX flags when NTLMSSP was negotiated for example) and adding support for NTLMv2 (which will be added with the next patch. In the meantime, this code is marked in an CONFIG_CIFS_EXPERIMENTAL block and will not be turned on by default until it is tested against more server types. Signed-off-by: Steve French <sfrench@us.ibm.com>
264 lines
8.1 KiB
C
264 lines
8.1 KiB
C
/*
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* fs/cifs/cifsencrypt.c
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*
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* Copyright (C) International Business Machines Corp., 2005,2006
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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,
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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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static int cifs_calc_signature2(const struct kvec * iov, int n_vec,
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const char * key, char * signature)
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{
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struct MD5Context context;
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if((iov == 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); */ /* BB FIXME BB */
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MD5Final(signature,&context);
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return -EOPNOTSUPP;
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/* return 0; */
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}
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int cifs_sign_smb2(struct kvec * iov, int n_vec, 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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struct smb_hdr * cifs_pdu = iov[0].iov_base;
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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 =
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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_calc_signature2(iov, n_vec, server->mac_signing_key,
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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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__le16 * 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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cifs_dump_mem("v2_sess_rsp: ", v2_session_response, 32); /* BB removeme BB */
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}
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