Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * fs/cifs/cifsencrypt.c |
| 3 | * |
Steve French | 12b3b8f | 2006-02-09 21:12:47 +0000 | [diff] [blame] | 4 | * Copyright (C) International Business Machines Corp., 2005,2006 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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" |
Steve French | 7c7b25b | 2006-06-01 19:20:10 +0000 | [diff] [blame^] | 29 | #include <linux/ctype.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 30 | |
| 31 | /* Calculate and return the CIFS signature based on the mac key and the smb pdu */ |
| 32 | /* the 16 byte signature must be allocated by the caller */ |
| 33 | /* Note we only use the 1st eight bytes */ |
| 34 | /* Note that the smb header signature field on input contains the |
| 35 | sequence number before this function is called */ |
| 36 | |
| 37 | extern void mdfour(unsigned char *out, unsigned char *in, int n); |
| 38 | extern void E_md4hash(const unsigned char *passwd, unsigned char *p16); |
Steve French | 7c7b25b | 2006-06-01 19:20:10 +0000 | [diff] [blame^] | 39 | extern void SMBencrypt(unsigned char *passwd, unsigned char *c8, |
| 40 | unsigned char *p24); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 41 | |
Steve French | 12b3b8f | 2006-02-09 21:12:47 +0000 | [diff] [blame] | 42 | static int cifs_calculate_signature(const struct smb_hdr * cifs_pdu, |
| 43 | const char * key, char * signature) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 44 | { |
| 45 | struct MD5Context context; |
| 46 | |
| 47 | if((cifs_pdu == NULL) || (signature == NULL)) |
| 48 | return -EINVAL; |
| 49 | |
| 50 | MD5Init(&context); |
Steve French | 7c7b25b | 2006-06-01 19:20:10 +0000 | [diff] [blame^] | 51 | MD5Update(&context,key,CIFS_SESS_KEY_SIZE+16); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 52 | MD5Update(&context,cifs_pdu->Protocol,cifs_pdu->smb_buf_length); |
| 53 | MD5Final(signature,&context); |
| 54 | return 0; |
| 55 | } |
| 56 | |
Steve French | ad009ac | 2005-04-28 22:41:05 -0700 | [diff] [blame] | 57 | int cifs_sign_smb(struct smb_hdr * cifs_pdu, struct TCP_Server_Info * server, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 58 | __u32 * pexpected_response_sequence_number) |
| 59 | { |
| 60 | int rc = 0; |
| 61 | char smb_signature[20]; |
| 62 | |
Steve French | ad009ac | 2005-04-28 22:41:05 -0700 | [diff] [blame] | 63 | if((cifs_pdu == NULL) || (server == NULL)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 64 | return -EINVAL; |
| 65 | |
| 66 | if((cifs_pdu->Flags2 & SMBFLG2_SECURITY_SIGNATURE) == 0) |
| 67 | return rc; |
| 68 | |
| 69 | spin_lock(&GlobalMid_Lock); |
Steve French | ad009ac | 2005-04-28 22:41:05 -0700 | [diff] [blame] | 70 | cifs_pdu->Signature.Sequence.SequenceNumber = cpu_to_le32(server->sequence_number); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 71 | cifs_pdu->Signature.Sequence.Reserved = 0; |
| 72 | |
Steve French | ad009ac | 2005-04-28 22:41:05 -0700 | [diff] [blame] | 73 | *pexpected_response_sequence_number = server->sequence_number++; |
| 74 | server->sequence_number++; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 75 | spin_unlock(&GlobalMid_Lock); |
| 76 | |
Steve French | ad009ac | 2005-04-28 22:41:05 -0700 | [diff] [blame] | 77 | rc = cifs_calculate_signature(cifs_pdu, server->mac_signing_key,smb_signature); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 78 | if(rc) |
| 79 | memset(cifs_pdu->Signature.SecuritySignature, 0, 8); |
| 80 | else |
| 81 | memcpy(cifs_pdu->Signature.SecuritySignature, smb_signature, 8); |
| 82 | |
| 83 | return rc; |
| 84 | } |
| 85 | |
Steve French | 84afc29 | 2005-12-02 13:32:45 -0800 | [diff] [blame] | 86 | static int cifs_calc_signature2(const struct kvec * iov, int n_vec, |
| 87 | const char * key, char * signature) |
| 88 | { |
Steve French | e9917a0 | 2006-03-31 21:22:00 +0000 | [diff] [blame] | 89 | struct MD5Context context; |
| 90 | int i; |
Steve French | 84afc29 | 2005-12-02 13:32:45 -0800 | [diff] [blame] | 91 | |
Steve French | e9917a0 | 2006-03-31 21:22:00 +0000 | [diff] [blame] | 92 | if((iov == NULL) || (signature == NULL)) |
| 93 | return -EINVAL; |
Steve French | 84afc29 | 2005-12-02 13:32:45 -0800 | [diff] [blame] | 94 | |
Steve French | e9917a0 | 2006-03-31 21:22:00 +0000 | [diff] [blame] | 95 | MD5Init(&context); |
Steve French | 7c7b25b | 2006-06-01 19:20:10 +0000 | [diff] [blame^] | 96 | MD5Update(&context,key,CIFS_SESS_KEY_SIZE+16); |
Steve French | e9917a0 | 2006-03-31 21:22:00 +0000 | [diff] [blame] | 97 | for(i=0;i<n_vec;i++) { |
| 98 | if(iov[i].iov_base == NULL) { |
| 99 | cERROR(1,("null iovec entry")); |
| 100 | return -EIO; |
| 101 | } else if(iov[i].iov_len == 0) |
| 102 | break; /* bail out if we are sent nothing to sign */ |
| 103 | /* The first entry includes a length field (which does not get |
| 104 | signed that occupies the first 4 bytes before the header */ |
| 105 | if(i==0) { |
| 106 | if (iov[0].iov_len <= 8 ) /* cmd field at offset 9 */ |
| 107 | break; /* nothing to sign or corrupt header */ |
| 108 | MD5Update(&context,iov[0].iov_base+4, iov[0].iov_len-4); |
| 109 | } else |
| 110 | MD5Update(&context,iov[i].iov_base, iov[i].iov_len); |
| 111 | } |
Steve French | 84afc29 | 2005-12-02 13:32:45 -0800 | [diff] [blame] | 112 | |
Steve French | e9917a0 | 2006-03-31 21:22:00 +0000 | [diff] [blame] | 113 | MD5Final(signature,&context); |
Steve French | 84afc29 | 2005-12-02 13:32:45 -0800 | [diff] [blame] | 114 | |
Steve French | e9917a0 | 2006-03-31 21:22:00 +0000 | [diff] [blame] | 115 | return 0; |
Steve French | 84afc29 | 2005-12-02 13:32:45 -0800 | [diff] [blame] | 116 | } |
| 117 | |
| 118 | |
| 119 | int cifs_sign_smb2(struct kvec * iov, int n_vec, struct TCP_Server_Info *server, |
| 120 | __u32 * pexpected_response_sequence_number) |
| 121 | { |
| 122 | int rc = 0; |
| 123 | char smb_signature[20]; |
| 124 | struct smb_hdr * cifs_pdu = iov[0].iov_base; |
| 125 | |
| 126 | if((cifs_pdu == NULL) || (server == NULL)) |
| 127 | return -EINVAL; |
| 128 | |
| 129 | if((cifs_pdu->Flags2 & SMBFLG2_SECURITY_SIGNATURE) == 0) |
| 130 | return rc; |
| 131 | |
| 132 | spin_lock(&GlobalMid_Lock); |
| 133 | cifs_pdu->Signature.Sequence.SequenceNumber = |
| 134 | cpu_to_le32(server->sequence_number); |
| 135 | cifs_pdu->Signature.Sequence.Reserved = 0; |
| 136 | |
| 137 | *pexpected_response_sequence_number = server->sequence_number++; |
| 138 | server->sequence_number++; |
| 139 | spin_unlock(&GlobalMid_Lock); |
| 140 | |
| 141 | rc = cifs_calc_signature2(iov, n_vec, server->mac_signing_key, |
| 142 | smb_signature); |
| 143 | if(rc) |
| 144 | memset(cifs_pdu->Signature.SecuritySignature, 0, 8); |
| 145 | else |
| 146 | memcpy(cifs_pdu->Signature.SecuritySignature, smb_signature, 8); |
| 147 | |
| 148 | return rc; |
| 149 | |
| 150 | } |
| 151 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 152 | int cifs_verify_signature(struct smb_hdr * cifs_pdu, const char * mac_key, |
| 153 | __u32 expected_sequence_number) |
| 154 | { |
| 155 | unsigned int rc; |
| 156 | char server_response_sig[8]; |
| 157 | char what_we_think_sig_should_be[20]; |
| 158 | |
| 159 | if((cifs_pdu == NULL) || (mac_key == NULL)) |
| 160 | return -EINVAL; |
| 161 | |
| 162 | if (cifs_pdu->Command == SMB_COM_NEGOTIATE) |
| 163 | return 0; |
| 164 | |
| 165 | if (cifs_pdu->Command == SMB_COM_LOCKING_ANDX) { |
| 166 | struct smb_com_lock_req * pSMB = (struct smb_com_lock_req *)cifs_pdu; |
| 167 | if(pSMB->LockType & LOCKING_ANDX_OPLOCK_RELEASE) |
| 168 | return 0; |
| 169 | } |
| 170 | |
| 171 | /* BB what if signatures are supposed to be on for session but server does not |
| 172 | send one? BB */ |
| 173 | |
| 174 | /* Do not need to verify session setups with signature "BSRSPYL " */ |
| 175 | if(memcmp(cifs_pdu->Signature.SecuritySignature,"BSRSPYL ",8)==0) |
| 176 | cFYI(1,("dummy signature received for smb command 0x%x",cifs_pdu->Command)); |
| 177 | |
| 178 | /* save off the origiginal signature so we can modify the smb and check |
| 179 | its signature against what the server sent */ |
| 180 | memcpy(server_response_sig,cifs_pdu->Signature.SecuritySignature,8); |
| 181 | |
| 182 | cifs_pdu->Signature.Sequence.SequenceNumber = cpu_to_le32(expected_sequence_number); |
| 183 | cifs_pdu->Signature.Sequence.Reserved = 0; |
| 184 | |
| 185 | rc = cifs_calculate_signature(cifs_pdu, mac_key, |
| 186 | what_we_think_sig_should_be); |
| 187 | |
| 188 | if(rc) |
| 189 | return rc; |
| 190 | |
| 191 | |
| 192 | /* cifs_dump_mem("what we think it should be: ",what_we_think_sig_should_be,16); */ |
| 193 | |
| 194 | if(memcmp(server_response_sig, what_we_think_sig_should_be, 8)) |
| 195 | return -EACCES; |
| 196 | else |
| 197 | return 0; |
| 198 | |
| 199 | } |
| 200 | |
| 201 | /* We fill in key by putting in 40 byte array which was allocated by caller */ |
| 202 | int cifs_calculate_mac_key(char * key, const char * rn, const char * password) |
| 203 | { |
| 204 | char temp_key[16]; |
| 205 | if ((key == NULL) || (rn == NULL)) |
| 206 | return -EINVAL; |
| 207 | |
| 208 | E_md4hash(password, temp_key); |
| 209 | mdfour(key,temp_key,16); |
Steve French | 7c7b25b | 2006-06-01 19:20:10 +0000 | [diff] [blame^] | 210 | memcpy(key+16,rn, CIFS_SESS_KEY_SIZE); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 211 | return 0; |
| 212 | } |
| 213 | |
| 214 | int CalcNTLMv2_partial_mac_key(struct cifsSesInfo * ses, struct nls_table * nls_info) |
| 215 | { |
| 216 | char temp_hash[16]; |
| 217 | struct HMACMD5Context ctx; |
| 218 | char * ucase_buf; |
Steve French | e89dc92 | 2005-11-11 15:18:19 -0800 | [diff] [blame] | 219 | __le16 * unicode_buf; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 220 | unsigned int i,user_name_len,dom_name_len; |
| 221 | |
| 222 | if(ses == NULL) |
| 223 | return -EINVAL; |
| 224 | |
| 225 | E_md4hash(ses->password, temp_hash); |
| 226 | |
| 227 | hmac_md5_init_limK_to_64(temp_hash, 16, &ctx); |
| 228 | user_name_len = strlen(ses->userName); |
| 229 | if(user_name_len > MAX_USERNAME_SIZE) |
| 230 | return -EINVAL; |
Steve French | 3979877 | 2006-05-31 22:40:51 +0000 | [diff] [blame] | 231 | if(ses->domainName == NULL) |
| 232 | return -EINVAL; /* BB should we use CIFS_LINUX_DOM */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 233 | dom_name_len = strlen(ses->domainName); |
| 234 | if(dom_name_len > MAX_USERNAME_SIZE) |
| 235 | return -EINVAL; |
| 236 | |
| 237 | ucase_buf = kmalloc((MAX_USERNAME_SIZE+1), GFP_KERNEL); |
| 238 | if(ucase_buf == NULL) |
| 239 | return -ENOMEM; |
| 240 | unicode_buf = kmalloc((MAX_USERNAME_SIZE+1)*4, GFP_KERNEL); |
| 241 | if(unicode_buf == NULL) { |
| 242 | kfree(ucase_buf); |
| 243 | return -ENOMEM; |
| 244 | } |
| 245 | |
| 246 | for(i=0;i<user_name_len;i++) |
| 247 | ucase_buf[i] = nls_info->charset2upper[(int)ses->userName[i]]; |
| 248 | ucase_buf[i] = 0; |
| 249 | user_name_len = cifs_strtoUCS(unicode_buf, ucase_buf, MAX_USERNAME_SIZE*2, nls_info); |
| 250 | unicode_buf[user_name_len] = 0; |
| 251 | user_name_len++; |
| 252 | |
| 253 | for(i=0;i<dom_name_len;i++) |
| 254 | ucase_buf[i] = nls_info->charset2upper[(int)ses->domainName[i]]; |
| 255 | ucase_buf[i] = 0; |
| 256 | dom_name_len = cifs_strtoUCS(unicode_buf+user_name_len, ucase_buf, MAX_USERNAME_SIZE*2, nls_info); |
| 257 | |
| 258 | unicode_buf[user_name_len + dom_name_len] = 0; |
| 259 | hmac_md5_update((const unsigned char *) unicode_buf, |
| 260 | (user_name_len+dom_name_len)*2,&ctx); |
| 261 | |
Steve French | ad009ac | 2005-04-28 22:41:05 -0700 | [diff] [blame] | 262 | hmac_md5_final(ses->server->mac_signing_key,&ctx); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 263 | kfree(ucase_buf); |
| 264 | kfree(unicode_buf); |
| 265 | return 0; |
| 266 | } |
Steve French | 7c7b25b | 2006-06-01 19:20:10 +0000 | [diff] [blame^] | 267 | |
| 268 | #ifdef CONFIG_CIFS_WEAK_PW_HASH |
| 269 | void calc_lanman_hash(struct cifsSesInfo * ses, char * lnm_session_key) |
| 270 | { |
| 271 | int i; |
| 272 | char password_with_pad[CIFS_ENCPWD_SIZE]; |
| 273 | |
| 274 | memset(password_with_pad, 0, CIFS_ENCPWD_SIZE); |
| 275 | strncpy(password_with_pad, ses->password, CIFS_ENCPWD_SIZE); |
| 276 | |
| 277 | /* calculate old style session key */ |
| 278 | /* calling toupper is less broken than repeatedly |
| 279 | calling nls_toupper would be since that will never |
| 280 | work for UTF8, but neither handles multibyte code pages |
| 281 | but the only alternative would be converting to UCS-16 (Unicode) |
| 282 | (using a routine something like UniStrupr) then |
| 283 | uppercasing and then converting back from Unicode - which |
| 284 | would only worth doing it if we knew it were utf8. Basically |
| 285 | utf8 and other multibyte codepages each need their own strupper |
| 286 | function since a byte at a time will ont work. */ |
| 287 | |
| 288 | for(i = 0; i < CIFS_ENCPWD_SIZE; i++) { |
| 289 | password_with_pad[i] = toupper(password_with_pad[i]); |
| 290 | } |
| 291 | |
| 292 | SMBencrypt(password_with_pad, ses->server->cryptKey, lnm_session_key); |
| 293 | /* clear password before we return/free memory */ |
| 294 | memset(password_with_pad, 0, CIFS_ENCPWD_SIZE); |
| 295 | } |
| 296 | #endif /* CIFS_WEAK_PW_HASH */ |
| 297 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 298 | void CalcNTLMv2_response(const struct cifsSesInfo * ses,char * v2_session_response) |
| 299 | { |
| 300 | struct HMACMD5Context context; |
| 301 | memcpy(v2_session_response + 8, ses->server->cryptKey,8); |
| 302 | /* gen_blob(v2_session_response + 16); */ |
Steve French | ad009ac | 2005-04-28 22:41:05 -0700 | [diff] [blame] | 303 | hmac_md5_init_limK_to_64(ses->server->mac_signing_key, 16, &context); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 304 | |
| 305 | hmac_md5_update(ses->server->cryptKey,8,&context); |
| 306 | /* hmac_md5_update(v2_session_response+16)client thing,8,&context); */ /* BB fix */ |
| 307 | |
| 308 | hmac_md5_final(v2_session_response,&context); |
Steve French | 5815449d | 2006-02-14 01:36:20 +0000 | [diff] [blame] | 309 | cifs_dump_mem("v2_sess_rsp: ", v2_session_response, 32); /* BB removeme BB */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 310 | } |