1 /* 2 * CDDL HEADER START 3 * 4 * The contents of this file are subject to the terms of the 5 * Common Development and Distribution License (the "License"). 6 * You may not use this file except in compliance with the License. 7 * 8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 9 * or http://www.opensolaris.org/os/licensing. 10 * See the License for the specific language governing permissions 11 * and limitations under the License. 12 * 13 * When distributing Covered Code, include this CDDL HEADER in each 14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 15 * If applicable, add the following below this CDDL HEADER, with the 16 * fields enclosed by brackets "[]" replaced with your own identifying 17 * information: Portions Copyright [yyyy] [name of copyright owner] 18 * 19 * CDDL HEADER END 20 */ 21 /* 22 * Copyright 2009 Sun Microsystems, Inc. All rights reserved. 23 * Use is subject to license terms. 24 */ 25 26 /* 27 * Notes on the virtual circuit (VC) values in the SMB Negotiate 28 * response and SessionSetupAndx request. 29 * 30 * A virtual circuit (VC) represents a connection between a client and a 31 * server using a reliable, session oriented transport protocol, such as 32 * NetBIOS or TCP/IP. Originally, each SMB session was restricted to a 33 * single underlying transport connection, i.e. a single NetBIOS session, 34 * which limited performance for raw data transfers. 35 * 36 * The intention behind multiple VCs was to improve performance by 37 * allowing parallelism over each NetBIOS session. For example, raw data 38 * could be transmitted using a different VC from other types of SMB 39 * requests to remove the interleaving restriction while a raw transfer 40 * is in progress. So the MaxNumberVcs field was added to the negotiate 41 * response to make the number of VCs configurable and to allow servers 42 * to specify how many they were prepared to support per session 43 * connection. This turned out to be difficult to manage and, with 44 * technology improvements, it has become obsolete. 45 * 46 * Servers should set the MaxNumberVcs value in the Negotiate response 47 * to 1. Clients should probably ignore it. If a server receives a 48 * SessionSetupAndx with a VC value of 0, it should close all other 49 * VCs to that client. If it receives a non-zero VC, it should leave 50 * other VCs in tact. 51 * 52 */ 53 54 /* 55 * SMB: negotiate 56 * 57 * Client Request Description 58 * ============================ ======================================= 59 * 60 * UCHAR WordCount; Count of parameter words = 0 61 * USHORT ByteCount; Count of data bytes; min = 2 62 * struct { 63 * UCHAR BufferFormat; 0x02 -- Dialect 64 * UCHAR DialectName[]; ASCII null-terminated string 65 * } Dialects[]; 66 * 67 * The Client sends a list of dialects that it can communicate with. The 68 * response is a selection of one of those dialects (numbered 0 through n) 69 * or -1 (hex FFFF) indicating that none of the dialects were acceptable. 70 * The negotiate message is binding on the virtual circuit and must be 71 * sent. One and only one negotiate message may be sent, subsequent 72 * negotiate requests will be rejected with an error response and no action 73 * will be taken. 74 * 75 * The protocol does not impose any particular structure to the dialect 76 * strings. Implementors of particular protocols may choose to include, 77 * for example, version numbers in the string. 78 * 79 * If the server does not understand any of the dialect strings, or if PC 80 * NETWORK PROGRAM 1.0 is the chosen dialect, the response format is 81 * 82 * Server Response Description 83 * ============================ ======================================= 84 * 85 * UCHAR WordCount; Count of parameter words = 1 86 * USHORT DialectIndex; Index of selected dialect 87 * USHORT ByteCount; Count of data bytes = 0 88 * 89 * If the chosen dialect is greater than core up to and including 90 * LANMAN2.1, the protocol response format is 91 * 92 * Server Response Description 93 * ============================ ======================================= 94 * 95 * UCHAR WordCount; Count of parameter words = 13 96 * USHORT DialectIndex; Index of selected dialect 97 * USHORT SecurityMode; Security mode: 98 * bit 0: 0 = share, 1 = user 99 * bit 1: 1 = use challenge/response 100 * authentication 101 * USHORT MaxBufferSize; Max transmit buffer size (>= 1024) 102 * USHORT MaxMpxCount; Max pending multiplexed requests 103 * USHORT MaxNumberVcs; Max VCs between client and server 104 * USHORT RawMode; Raw modes supported: 105 * bit 0: 1 = Read Raw supported 106 * bit 1: 1 = Write Raw supported 107 * ULONG SessionKey; Unique token identifying this session 108 * SMB_TIME ServerTime; Current time at server 109 * SMB_DATE ServerDate; Current date at server 110 * USHORT ServerTimeZone; Current time zone at server 111 * USHORT EncryptionKeyLength; MBZ if this is not LM2.1 112 * USHORT Reserved; MBZ 113 * USHORT ByteCount Count of data bytes 114 * UCHAR EncryptionKey[]; The challenge encryption key 115 * STRING PrimaryDomain[]; The server's primary domain 116 * 117 * MaxBufferSize is the size of the largest message which the client can 118 * legitimately send to the server 119 * 120 * If bit0 of the Flags field is set in the negotiate response, this 121 * indicates the server supports the SMB_COM_LOCK_AND_READ and 122 * SMB_COM_WRITE_AND_UNLOCK client requests. 123 * 124 * If the SecurityMode field indicates the server is running in user mode, 125 * the client must send appropriate SMB_COM_SESSION_SETUP_ANDX requests 126 * before the server will allow the client to access resources. If the 127 * SecurityMode fields indicates the client should use challenge/response 128 * authentication, the client should use the authentication mechanism 129 * specified in section 2.10. 130 * 131 * Clients should submit no more than MaxMpxCount distinct unanswered SMBs 132 * to the server when using multiplexed reads or writes (see sections 5.13 133 * and 5.25) 134 * 135 * Clients using the "MICROSOFT NETWORKS 1.03" dialect use a different 136 * form of raw reads than documented here, and servers are better off 137 * setting RawMode in this response to 0 for such sessions. 138 * 139 * If the negotiated dialect is "DOS LANMAN2.1" or "LANMAN2.1", then 140 * PrimaryDomain string should be included in this response. 141 * 142 * If the negotiated dialect is NT LM 0.12, the response format is 143 * 144 * Server Response Description 145 * ========================== ========================================= 146 * 147 * UCHAR WordCount; Count of parameter words = 17 148 * USHORT DialectIndex; Index of selected dialect 149 * UCHAR SecurityMode; Security mode: 150 * bit 0: 0 = share, 1 = user 151 * bit 1: 1 = encrypt passwords 152 * USHORT MaxMpxCount; Max pending multiplexed requests 153 * USHORT MaxNumberVcs; Max VCs between client and server 154 * ULONG MaxBufferSize; Max transmit buffer size 155 * ULONG MaxRawSize; Maximum raw buffer size 156 * ULONG SessionKey; Unique token identifying this session 157 * ULONG Capabilities; Server capabilities 158 * ULONG SystemTimeLow; System (UTC) time of the server (low). 159 * ULONG SystemTimeHigh; System (UTC) time of the server (high). 160 * USHORT ServerTimeZone; Time zone of server (min from UTC) 161 * UCHAR EncryptionKeyLength; Length of encryption key. 162 * USHORT ByteCount; Count of data bytes 163 * UCHAR EncryptionKey[]; The challenge encryption key 164 * UCHAR OemDomainName[]; The name of the domain (in OEM chars) 165 * 166 * In addition to the definitions above, MaxBufferSize is the size of the 167 * largest message which the client can legitimately send to the server. 168 * If the client is using a connectionless protocol, MaxBufferSize must be 169 * set to the smaller of the server's internal buffer size and the amount 170 * of data which can be placed in a response packet. 171 * 172 * MaxRawSize specifies the maximum message size the server can send or 173 * receive for SMB_COM_WRITE_RAW or SMB_COM_READ_RAW. 174 * 175 * Connectionless clients must set Sid to 0 in the SMB request header. 176 * 177 * Capabilities allows the server to tell the client what it supports. 178 * The bit definitions defined in cifs.h. Bit 0x2000 used to be set in 179 * the negotiate response capabilities but it caused problems with 180 * Windows 2000. It is probably not valid, it doesn't appear in the 181 * CIFS spec. 182 * 183 * 4.1.1.1 Errors 184 * 185 * SUCCESS/SUCCESS 186 * ERRSRV/ERRerror 187 */ 188 #include <sys/types.h> 189 #include <sys/strsubr.h> 190 #include <sys/socketvar.h> 191 #include <sys/socket.h> 192 #include <sys/random.h> 193 #include <netinet/in.h> 194 #include <smbsrv/smb_incl.h> 195 #include <smbsrv/smbinfo.h> 196 #include <smbsrv/smb_i18n.h> 197 198 /* 199 * Maximum buffer size for DOS: chosen to be the same as NT. 200 * Do not change this value, DOS is very sensitive to it. 201 */ 202 #define SMB_DOS_MAXBUF 0x1104 203 204 /* 205 * The DOS TCP rcvbuf is set to 8700 because DOS 6.1 seems to have problems 206 * with other values. DOS 6.1 seems to depend on a window value of 8700 to 207 * send the next set of data. If we return a window value of 40KB, after 208 * sending 8700 bytes of data, it will start the next set of data from 40KB 209 * instead of 8.7k. Why 8.7k? We have no idea; it is the value that NT uses. 210 * September 2000. 211 * 212 * IR104720 Increased smb_nt_tcp_rcvbuf from 40KB to just under 1MB to allow 213 * for a larger TCP window sizei based on observations of Windows 2000 and 214 * performance testing. March 2003. 215 */ 216 static uint32_t smb_dos_tcp_rcvbuf = 8700; 217 static uint32_t smb_nt_tcp_rcvbuf = 1048560; /* scale factor of 4 */ 218 219 static void smb_get_security_info(smb_request_t *, unsigned short *, 220 unsigned char *, unsigned char *, uint32_t *); 221 222 /* 223 * Function: int smb_com_negotiate(struct smb_request *) 224 */ 225 smb_sdrc_t 226 smb_pre_negotiate(smb_request_t *sr) 227 { 228 DTRACE_SMB_1(op__Negotiate__start, smb_request_t *, sr); 229 smb_rwx_rwenter(&sr->session->s_lock, RW_WRITER); 230 return (SDRC_SUCCESS); 231 } 232 233 void 234 smb_post_negotiate(smb_request_t *sr) 235 { 236 DTRACE_SMB_1(op__Negotiate__done, smb_request_t *, sr); 237 smb_rwx_rwexit(&sr->session->s_lock); 238 } 239 240 smb_sdrc_t 241 smb_com_negotiate(smb_request_t *sr) 242 { 243 int dialect = 0; 244 int this_dialect; 245 unsigned char keylen; 246 int sel_pos = -1; 247 int pos; 248 char key[32]; 249 char *p; 250 timestruc_t time_val; 251 unsigned short secmode; 252 uint32_t sesskey; 253 uint32_t capabilities = 0; 254 int rc; 255 unsigned short max_mpx_count; 256 int16_t tz_correction; 257 char ipaddr_buf[INET6_ADDRSTRLEN]; 258 char *tmpbuf; 259 int buflen; 260 smb_msgbuf_t mb; 261 262 if (sr->session->s_state != SMB_SESSION_STATE_ESTABLISHED) { 263 /* The protocol has already been negotiated. */ 264 smbsr_error(sr, 0, ERRSRV, ERRerror); 265 return (SDRC_ERROR); 266 } 267 268 for (pos = 0; 269 sr->smb_data.chain_offset < sr->smb_data.max_bytes; 270 pos++) { 271 if (smb_mbc_decodef(&sr->smb_data, "%L", sr, &p) != 0) { 272 smbsr_error(sr, 0, ERRSRV, ERRerror); 273 return (SDRC_ERROR); 274 } 275 276 this_dialect = smb_xlate_dialect_str_to_cd(p); 277 278 if (this_dialect < 0) 279 continue; 280 281 if (dialect < this_dialect) { 282 dialect = this_dialect; 283 sel_pos = pos; 284 } 285 } 286 287 smb_get_security_info(sr, &secmode, (unsigned char *)key, 288 &keylen, &sesskey); 289 290 (void) microtime(&time_val); 291 tz_correction = sr->sr_gmtoff / 60; 292 293 switch (dialect) { 294 case PC_NETWORK_PROGRAM_1_0: /* core */ 295 (void) ksocket_setsockopt(sr->session->sock, SOL_SOCKET, 296 SO_RCVBUF, (const void *)&smb_dos_tcp_rcvbuf, 297 sizeof (smb_dos_tcp_rcvbuf), CRED()); 298 rc = smbsr_encode_result(sr, 1, 0, "bww", 1, sel_pos, 0); 299 break; 300 301 case Windows_for_Workgroups_3_1a: 302 case PCLAN1_0: 303 case MICROSOFT_NETWORKS_1_03: 304 case MICROSOFT_NETWORKS_3_0: 305 case LANMAN1_0: 306 case LM1_2X002: 307 case DOS_LM1_2X002: 308 (void) ksocket_setsockopt(sr->session->sock, SOL_SOCKET, 309 SO_RCVBUF, (const void *)&smb_dos_tcp_rcvbuf, 310 sizeof (smb_dos_tcp_rcvbuf), CRED()); 311 sr->smb_flg |= SMB_FLAGS_LOCK_AND_READ_OK; 312 rc = smbsr_encode_result(sr, 13, VAR_BCC, 313 "bwwwwwwlYww2.w#c", 314 13, /* wct */ 315 sel_pos, /* dialect index */ 316 secmode, /* security mode */ 317 SMB_DOS_MAXBUF, /* max buffer size */ 318 1, /* max MPX (temporary) */ 319 1, /* max VCs (temporary, ambiguous) */ 320 3, /* raw mode (s/b 3) */ 321 sesskey, /* session key */ 322 time_val.tv_sec, /* server time/date */ 323 tz_correction, 324 (short)keylen, /* Encryption Key Length */ 325 /* reserved field handled 2. */ 326 VAR_BCC, 327 (int)keylen, 328 key); /* encryption key */ 329 break; 330 331 case DOS_LANMAN2_1: 332 case LANMAN2_1: 333 (void) ksocket_setsockopt(sr->session->sock, SOL_SOCKET, 334 SO_RCVBUF, (const void *)&smb_dos_tcp_rcvbuf, 335 sizeof (smb_dos_tcp_rcvbuf), CRED()); 336 sr->smb_flg |= SMB_FLAGS_LOCK_AND_READ_OK; 337 rc = smbsr_encode_result(sr, 13, VAR_BCC, 338 "bwwwwwwlYww2.w#cs", 339 13, /* wct */ 340 sel_pos, /* dialect index */ 341 secmode, /* security mode */ 342 SMB_DOS_MAXBUF, /* max buffer size */ 343 1, /* max MPX (temporary) */ 344 1, /* max VCs (temporary, ambiguous) */ 345 3, /* raw mode (s/b 3) */ 346 sesskey, /* session key */ 347 time_val.tv_sec, /* server time/date */ 348 tz_correction, 349 (short)keylen, /* Encryption Key Length */ 350 /* reserved field handled 2. */ 351 VAR_BCC, 352 (int)keylen, 353 key, /* encryption key */ 354 sr->sr_cfg->skc_nbdomain); 355 break; 356 357 case NT_LM_0_12: 358 (void) ksocket_setsockopt(sr->session->sock, SOL_SOCKET, 359 SO_RCVBUF, (const void *)&smb_nt_tcp_rcvbuf, 360 sizeof (smb_nt_tcp_rcvbuf), CRED()); 361 /* 362 * UNICODE support is required for long share names, 363 * long file names and streams. 364 */ 365 capabilities = CAP_LARGE_FILES 366 | CAP_UNICODE 367 | CAP_NT_SMBS 368 | CAP_STATUS32 369 | CAP_NT_FIND 370 | CAP_RAW_MODE 371 | CAP_LEVEL_II_OPLOCKS 372 | CAP_LOCK_AND_READ 373 | CAP_RPC_REMOTE_APIS 374 | CAP_LARGE_READX 375 | CAP_LARGE_WRITEX; 376 377 /* 378 * Turn off Extended Security Negotiation 379 */ 380 sr->smb_flg2 &= ~SMB_FLAGS2_EXT_SEC; 381 382 /* 383 * Allow SMB signatures if security challenge response enabled 384 */ 385 if ((secmode & NEGOTIATE_SECURITY_CHALLENGE_RESPONSE) && 386 sr->sr_cfg->skc_signing_enable) { 387 secmode |= NEGOTIATE_SECURITY_SIGNATURES_ENABLED; 388 if (sr->sr_cfg->skc_signing_required) 389 secmode |= 390 NEGOTIATE_SECURITY_SIGNATURES_REQUIRED; 391 392 sr->session->secmode = secmode; 393 } 394 (void) smb_inet_ntop(&sr->session->ipaddr, ipaddr_buf, 395 SMB_IPSTRLEN(sr->session->ipaddr.a_family)); 396 397 max_mpx_count = sr->sr_cfg->skc_maxworkers; 398 399 /* 400 * skc_nbdomain is not expected to be aligned. 401 * Use temporary buffer to avoid alignment padding 402 */ 403 buflen = mts_wcequiv_strlen(sr->sr_cfg->skc_nbdomain) + 404 sizeof (mts_wchar_t); 405 tmpbuf = kmem_zalloc(buflen, KM_SLEEP); 406 smb_msgbuf_init(&mb, (uint8_t *)tmpbuf, buflen, 407 SMB_MSGBUF_UNICODE); 408 if (smb_msgbuf_encode(&mb, "U", 409 sr->sr_cfg->skc_nbdomain) < 0) { 410 smb_msgbuf_term(&mb); 411 kmem_free(tmpbuf, buflen); 412 smbsr_error(sr, 0, ERRSRV, ERRerror); 413 return (SDRC_ERROR); 414 } 415 416 rc = smbsr_encode_result(sr, 17, VAR_BCC, 417 "bwbwwllllTwbw#c#c", 418 17, /* wct */ 419 sel_pos, /* dialect index */ 420 secmode, /* security mode */ 421 max_mpx_count, /* max MPX (temporary) */ 422 1, /* max VCs (temporary, ambiguous) */ 423 (DWORD)smb_maxbufsize, /* max buffer size */ 424 0xFFFF, /* max raw size */ 425 sesskey, /* session key */ 426 capabilities, 427 &time_val, /* system time */ 428 tz_correction, 429 keylen, /* Encryption Key Length */ 430 VAR_BCC, 431 (int)keylen, 432 key, /* encryption key */ 433 buflen, 434 tmpbuf); /* skc_nbdomain */ 435 436 smb_msgbuf_term(&mb); 437 kmem_free(tmpbuf, buflen); 438 break; 439 440 default: 441 sel_pos = -1; 442 rc = smbsr_encode_result(sr, 1, 0, "bww", 1, sel_pos, 0); 443 return ((rc == 0) ? SDRC_SUCCESS : SDRC_ERROR); 444 } 445 446 if (rc != 0) 447 return (SDRC_ERROR); 448 449 /* 450 * Save the agreed dialect. Note that this value is also 451 * used to detect and reject attempts to re-negotiate. 452 */ 453 sr->session->dialect = dialect; 454 sr->session->s_state = SMB_SESSION_STATE_NEGOTIATED; 455 return (SDRC_SUCCESS); 456 } 457 458 static void 459 smb_get_security_info( 460 struct smb_request *sr, 461 unsigned short *secmode, 462 unsigned char *key, 463 unsigned char *keylen, 464 uint32_t *sesskey) 465 { 466 uchar_t tmp_key[8]; 467 468 (void) random_get_pseudo_bytes(tmp_key, 8); 469 bcopy(tmp_key, &sr->session->challenge_key, 8); 470 sr->session->challenge_len = 8; 471 *keylen = 8; 472 bcopy(tmp_key, key, 8); 473 474 sr->session->secmode = NEGOTIATE_SECURITY_CHALLENGE_RESPONSE| 475 NEGOTIATE_SECURITY_USER_LEVEL; 476 477 (void) random_get_pseudo_bytes(tmp_key, 4); 478 sr->session->sesskey = tmp_key[0] | tmp_key[1] << 8 | 479 tmp_key[2] << 16 | tmp_key[3] << 24; 480 481 *secmode = sr->session->secmode; 482 *sesskey = sr->session->sesskey; 483 } 484