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| 1 | /* | |||
| 2 | * fs/cifs/cifsencrypt.c | |||
| 3 | * | |||
| 4 | * Copyright (C) International Business Machines Corp., 2005 | |||
| 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 | ||||
| 36 | extern void mdfour(unsigned char *out, unsigned char *in, int n); | |||
| 37 | extern void E_md4hash(const unsigned char *passwd, unsigned char *p16); | |||
| 38 | ||||
| 0 | 0 | - | 39 | static int cifs_calculate_signature(const struct smb_hdr * cifs_pdu, const char * key, char * signature) |
| 40 | { | |||
| 41 | struct MD5Context context; | |||
| 42 | ||||
| 0 | 0 | - | 43 | if((cifs_pdu == NULL) || (signature == NULL)) |
| 0 | - | 43 | (T) || (_) | |
| 0 | - | 43 | (F) || (T) | |
| 0 | - | 43 | (F) || (F) | |
| 0 | - | 44 | return -EINVAL; | |
| 45 | ||||
| 46 | MD5Init(&context); | |||
| 47 | MD5Update(&context,key,CIFS_SESSION_KEY_SIZE+16); | |||
| 48 | MD5Update(&context,cifs_pdu->Protocol,cifs_pdu->smb_buf_length); | |||
| 49 | MD5Final(signature,&context); | |||
| 0 | - | 50 | return 0; | |
| 51 | } | |||
| 52 | ||||
| 0 | 0 | - | 53 | int cifs_sign_smb(struct smb_hdr * cifs_pdu, struct TCP_Server_Info * server, |
| 54 | __u32 * pexpected_response_sequence_number) | |||
| 55 | { | |||
| 56 | int rc = 0; | |||
| 57 | char smb_signature[20]; | |||
| 58 | ||||
| 0 | 0 | - | 59 | if((cifs_pdu == NULL) || (server == NULL)) |
| 0 | - | 59 | (T) || (_) | |
| 0 | - | 59 | (F) || (T) | |
| 0 | - | 59 | (F) || (F) | |
| 0 | - | 60 | return -EINVAL; | |
| 61 | ||||
| 0 | 0 | - | 62 | if((cifs_pdu->Flags2 & SMBFLG2_SECURITY_SIGNATURE) == 0) |
| 0 | - | 63 | return rc; | |
| 64 | ||||
| 65 | spin_lock(&GlobalMid_Lock); | |||
| 65 | do | |||
| 0 | 0 | - | 65 | do-while (0) |
| 0 | 0 | - | 65 | do-while (0) |
| 66 | cifs_pdu->Signature.Sequence.SequenceNumber = cpu_to_le32(server->sequence_number); | |||
| 67 | cifs_pdu->Signature.Sequence.Reserved = 0; | |||
| 68 | ||||
| 69 | *pexpected_response_sequence_number = server->sequence_number++; | |||
| 70 | server->sequence_number++; | |||
| 71 | spin_unlock(&GlobalMid_Lock); | |||
| 71 | do | |||
| 0 | 0 | - | 71 | do-while (0) |
| 0 | 0 | - | 71 | do-while (0) |
| 72 | ||||
| 73 | rc = cifs_calculate_signature(cifs_pdu, server->mac_signing_key,smb_signature); | |||
| 0 | 0 | - | 74 | if(rc) |
| 75 | memset(cifs_pdu->Signature.SecuritySignature, 0, 8); | |||
| 76 | else | |||
| 77 | memcpy(cifs_pdu->Signature.SecuritySignature, smb_signature, 8); | |||
| 78 | ||||
| 0 | - | 79 | return rc; | |
| 80 | } | |||
| 81 | ||||
| 0 | 0 | - | 82 | static int cifs_calc_signature2(const struct kvec * iov, int n_vec, |
| 83 | const char * key, char * signature) | |||
| 84 | { | |||
| 85 | struct MD5Context context; | |||
| 86 | int i; | |||
| 87 | ||||
| 0 | 0 | - | 88 | if((iov == NULL) || (signature == NULL)) |
| 0 | - | 88 | (T) || (_) | |
| 0 | - | 88 | (F) || (T) | |
| 0 | - | 88 | (F) || (F) | |
| 0 | - | 89 | return -EINVAL; | |
| 90 | ||||
| 91 | MD5Init(&context); | |||
| 92 | MD5Update(&context,key,CIFS_SESSION_KEY_SIZE+16); | |||
| 0 | 0 | - | 93 | for(i=0;i<n_vec;i++) { |
| 0 | 0 | - | 94 | if(iov[i].iov_base == NULL) { |
| 0 | 0 | - | 95 | cERROR(1,("null iovec entry")); |
| 0 | 0 | - | 95 | if (cifsERROR) |
| 0 | - | 96 | return -EIO; | |
| 0 | 0 | - | 97 | } else if(iov[i].iov_len == 0) |
| 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 */ | |||
| 0 | 0 | - | 101 | if(i==0) { |
| 0 | 0 | - | 102 | if (iov[0].iov_len <= 8 ) /* cmd field at offset 9 */ |
| 0 | - | 103 | break; /* nothing to sign or corrupt header */ | |
| 104 | MD5Update(&context,iov[0].iov_base+4, iov[0].iov_len-4); | |||
| 105 | } else | |||
| 106 | MD5Update(&context,iov[i].iov_base, iov[i].iov_len); | |||
| 107 | } | |||
| 108 | ||||
| 109 | MD5Final(signature,&context); | |||
| 110 | ||||
| 0 | - | 111 | return 0; | |
| 112 | } | |||
| 113 | ||||
| 114 | ||||
| 0 | 0 | - | 115 | int cifs_sign_smb2(struct kvec * iov, int n_vec, struct TCP_Server_Info *server, |
| 116 | __u32 * pexpected_response_sequence_number) | |||
| 117 | { | |||
| 118 | int rc = 0; | |||
| 119 | char smb_signature[20]; | |||
| 120 | struct smb_hdr * cifs_pdu = iov[0].iov_base; | |||
| 121 | ||||
| 0 | 0 | - | 122 | if((cifs_pdu == NULL) || (server == NULL)) |
| 0 | - | 122 | (T) || (_) | |
| 0 | - | 122 | (F) || (T) | |
| 0 | - | 122 | (F) || (F) | |
| 0 | - | 123 | return -EINVAL; | |
| 124 | ||||
| 0 | 0 | - | 125 | if((cifs_pdu->Flags2 & SMBFLG2_SECURITY_SIGNATURE) == 0) |
| 0 | - | 126 | return rc; | |
| 127 | ||||
| 128 | spin_lock(&GlobalMid_Lock); | |||
| 128 | do | |||
| 0 | 0 | - | 128 | do-while (0) |
| 0 | 0 | - | 128 | do-while (0) |
| 129 | cifs_pdu->Signature.Sequence.SequenceNumber = | |||
| 130 | cpu_to_le32(server->sequence_number); | |||
| 131 | cifs_pdu->Signature.Sequence.Reserved = 0; | |||
| 132 | ||||
| 133 | *pexpected_response_sequence_number = server->sequence_number++; | |||
| 134 | server->sequence_number++; | |||
| 135 | spin_unlock(&GlobalMid_Lock); | |||
| 135 | do | |||
| 0 | 0 | - | 135 | do-while (0) |
| 0 | 0 | - | 135 | do-while (0) |
| 136 | ||||
| 137 | rc = cifs_calc_signature2(iov, n_vec, server->mac_signing_key, | |||
| 138 | smb_signature); | |||
| 0 | 0 | - | 139 | if(rc) |
| 140 | memset(cifs_pdu->Signature.SecuritySignature, 0, 8); | |||
| 141 | else | |||
| 142 | memcpy(cifs_pdu->Signature.SecuritySignature, smb_signature, 8); | |||
| 143 | ||||
| 0 | - | 144 | return rc; | |
| 145 | ||||
| 146 | } | |||
| 147 | ||||
| 0 | 0 | - | 148 | int cifs_verify_signature(struct smb_hdr * cifs_pdu, const char * mac_key, |
| 149 | __u32 expected_sequence_number) | |||
| 150 | { | |||
| 151 | unsigned int rc; | |||
| 152 | char server_response_sig[8]; | |||
| 153 | char what_we_think_sig_should_be[20]; | |||
| 154 | ||||
| 0 | 0 | - | 155 | if((cifs_pdu == NULL) || (mac_key == NULL)) |
| 0 | - | 155 | (T) || (_) | |
| 0 | - | 155 | (F) || (T) | |
| 0 | - | 155 | (F) || (F) | |
| 0 | - | 156 | return -EINVAL; | |
| 157 | ||||
| 0 | 0 | - | 158 | if (cifs_pdu->Command == SMB_COM_NEGOTIATE) |
| 0 | - | 159 | return 0; | |
| 160 | ||||
| 0 | 0 | - | 161 | if (cifs_pdu->Command == SMB_COM_LOCKING_ANDX) { |
| 162 | struct smb_com_lock_req * pSMB = (struct smb_com_lock_req *)cifs_pdu; | |||
| 0 | 0 | - | 163 | if(pSMB->LockType & LOCKING_ANDX_OPLOCK_RELEASE) |
| 0 | - | 164 | return 0; | |
| 165 | } | |||
| 166 | ||||
| 167 | /* BB what if signatures are supposed to be on for session but server does not | |||
| 168 | send one? BB */ | |||
| 169 | ||||
| 170 | /* Do not need to verify session setups with signature "BSRSPYL " */ | |||
| 0 | 0 | - | 171 | if(memcmp(cifs_pdu->Signature.SecuritySignature,"BSRSPYL ",8)==0) |
| 0 | 0 | - | 172 | cFYI(1,("dummy signature received for smb command 0x%x",cifs_pdu->Command)); |
| 0 | 0 | - | 172 | if (cifsFYI & 0x01) |
| 173 | ||||
| 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); | |||
| 177 | ||||
| 178 | cifs_pdu->Signature.Sequence.SequenceNumber = cpu_to_le32(expected_sequence_number); | |||
| 179 | cifs_pdu->Signature.Sequence.Reserved = 0; | |||
| 180 | ||||
| 181 | rc = cifs_calculate_signature(cifs_pdu, mac_key, | |||
| 182 | what_we_think_sig_should_be); | |||
| 183 | ||||
| 0 | 0 | - | 184 | if(rc) |
| 0 | - | 185 | return rc; | |
| 186 | ||||
| 187 | ||||
| 188 | /* cifs_dump_mem("what we think it should be: ",what_we_think_sig_should_be,16); */ | |||
| 189 | ||||
| 0 | 0 | - | 190 | if(memcmp(server_response_sig, what_we_think_sig_should_be, 8)) |
| 0 | - | 191 | return -EACCES; | |
| 192 | else | |||
| 0 | - | 193 | return 0; | |
| 194 | ||||
| 195 | } | |||
| 196 | ||||
| 197 | /* We fill in key by putting in 40 byte array which was allocated by caller */ | |||
| 0 | 0 | - | 198 | int cifs_calculate_mac_key(char * key, const char * rn, const char * password) |
| 199 | { | |||
| 200 | char temp_key[16]; | |||
| 0 | 0 | - | 201 | if ((key == NULL) || (rn == NULL)) |
| 0 | - | 201 | (T) || (_) | |
| 0 | - | 201 | (F) || (T) | |
| 0 | - | 201 | (F) || (F) | |
| 0 | - | 202 | return -EINVAL; | |
| 203 | ||||
| 204 | E_md4hash(password, temp_key); | |||
| 205 | mdfour(key,temp_key,16); | |||
| 206 | memcpy(key+16,rn, CIFS_SESSION_KEY_SIZE); | |||
| 0 | - | 207 | return 0; | |
| 208 | } | |||
| 209 | ||||
| 0 | 0 | - | 210 | int CalcNTLMv2_partial_mac_key(struct cifsSesInfo * ses, struct nls_table * nls_info) |
| 211 | { | |||
| 212 | char temp_hash[16]; | |||
| 213 | struct HMACMD5Context ctx; | |||
| 214 | char * ucase_buf; | |||
| 215 | __le16 * unicode_buf; | |||
| 216 | unsigned int i,user_name_len,dom_name_len; | |||
| 217 | ||||
| 0 | 0 | - | 218 | if(ses == NULL) |
| 0 | - | 219 | return -EINVAL; | |
| 220 | ||||
| 221 | E_md4hash(ses->password, temp_hash); | |||
| 222 | ||||
| 223 | hmac_md5_init_limK_to_64(temp_hash, 16, &ctx); | |||
| 224 | user_name_len = strlen(ses->userName); | |||
| 0 | 0 | - | 225 | if(user_name_len > MAX_USERNAME_SIZE) |
| 0 | - | 226 | return -EINVAL; | |
| 227 | dom_name_len = strlen(ses->domainName); | |||
| 0 | 0 | - | 228 | if(dom_name_len > MAX_USERNAME_SIZE) |
| 0 | - | 229 | return -EINVAL; | |
| 230 | ||||
| 231 | ucase_buf = kmalloc((MAX_USERNAME_SIZE+1), GFP_KERNEL); | |||
| 0 | 0 | - | 232 | if(ucase_buf == NULL) |
| 0 | - | 233 | return -ENOMEM; | |
| 234 | unicode_buf = kmalloc((MAX_USERNAME_SIZE+1)*4, GFP_KERNEL); | |||
| 0 | 0 | - | 235 | if(unicode_buf == NULL) { |
| 236 | kfree(ucase_buf); | |||
| 0 | - | 237 | return -ENOMEM; | |
| 238 | } | |||
| 239 | ||||
| 0 | 0 | - | 240 | for(i=0;i<user_name_len;i++) |
| 241 | ucase_buf[i] = nls_info->charset2upper[(int)ses->userName[i]]; | |||
| 242 | ucase_buf[i] = 0; | |||
| 243 | user_name_len = cifs_strtoUCS(unicode_buf, ucase_buf, MAX_USERNAME_SIZE*2, nls_info); | |||
| 244 | unicode_buf[user_name_len] = 0; | |||
| 245 | user_name_len++; | |||
| 246 | ||||
| 0 | 0 | - | 247 | for(i=0;i<dom_name_len;i++) |
| 248 | ucase_buf[i] = nls_info->charset2upper[(int)ses->domainName[i]]; | |||
| 249 | ucase_buf[i] = 0; | |||
| 250 | dom_name_len = cifs_strtoUCS(unicode_buf+user_name_len, ucase_buf, MAX_USERNAME_SIZE*2, nls_info); | |||
| 251 | ||||
| 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); | |||
| 255 | ||||
| 256 | hmac_md5_final(ses->server->mac_signing_key,&ctx); | |||
| 257 | kfree(ucase_buf); | |||
| 258 | kfree(unicode_buf); | |||
| 0 | - | 259 | return 0; | |
| 260 | } | |||
| 0 | 0 | - | 261 | void CalcNTLMv2_response(const struct cifsSesInfo * ses,char * v2_session_response) |
| 262 | { | |||
| 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); | |||
| 267 | ||||
| 268 | hmac_md5_update(ses->server->cryptKey,8,&context); | |||
| 269 | /* hmac_md5_update(v2_session_response+16)client thing,8,&context); */ /* BB fix */ | |||
| 270 | ||||
| 271 | hmac_md5_final(v2_session_response,&context); | |||
| 272 | } | |||
| ***TER 0% (0/133) of SOURCE FILE cifsencrypt.c | ||||