/* * CDDL HEADER START * * The contents of this file are subject to the terms of the * Common Development and Distribution License (the "License"). * You may not use this file except in compliance with the License. * * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE * or http://www.opensolaris.org/os/licensing. * See the License for the specific language governing permissions * and limitations under the License. * * When distributing Covered Code, include this CDDL HEADER in each * file and include the License file at usr/src/OPENSOLARIS.LICENSE. * If applicable, add the following below this CDDL HEADER, with the * fields enclosed by brackets "[]" replaced with your own identifying * information: Portions Copyright [yyyy] [name of copyright owner] * * CDDL HEADER END */ /* * Copyright 2008 Sun Microsystems, Inc. All rights reserved. * Use is subject to license terms. */ #pragma ident "@(#)smb_negotiate.c 1.6 08/07/21 SMI" /* * Notes on the virtual circuit (VC) values in the SMB Negotiate * response and SessionSetupAndx request. * * A virtual circuit (VC) represents a connection between a client and a * server using a reliable, session oriented transport protocol, such as * NetBIOS or TCP/IP. Originally, each SMB session was restricted to a * single underlying transport connection, i.e. a single NetBIOS session, * which limited performance for raw data transfers. * * The intention behind multiple VCs was to improve performance by * allowing parallelism over each NetBIOS session. For example, raw data * could be transmitted using a different VC from other types of SMB * requests to remove the interleaving restriction while a raw transfer * is in progress. So the MaxNumberVcs field was added to the negotiate * response to make the number of VCs configurable and to allow servers * to specify how many they were prepared to support per session * connection. This turned out to be difficult to manage and, with * technology improvements, it has become obsolete. * * Servers should set the MaxNumberVcs value in the Negotiate response * to 1. Clients should probably ignore it. If a server receives a * SessionSetupAndx with a VC value of 0, it should close all other * VCs to that client. If it receives a non-zero VC, it should leave * other VCs in tact. * */ /* * SMB: negotiate * * Client Request Description * ============================ ======================================= * * UCHAR WordCount; Count of parameter words = 0 * USHORT ByteCount; Count of data bytes; min = 2 * struct { * UCHAR BufferFormat; 0x02 -- Dialect * UCHAR DialectName[]; ASCII null-terminated string * } Dialects[]; * * The Client sends a list of dialects that it can communicate with. The * response is a selection of one of those dialects (numbered 0 through n) * or -1 (hex FFFF) indicating that none of the dialects were acceptable. * The negotiate message is binding on the virtual circuit and must be * sent. One and only one negotiate message may be sent, subsequent * negotiate requests will be rejected with an error response and no action * will be taken. * * The protocol does not impose any particular structure to the dialect * strings. Implementors of particular protocols may choose to include, * for example, version numbers in the string. * * If the server does not understand any of the dialect strings, or if PC * NETWORK PROGRAM 1.0 is the chosen dialect, the response format is * * Server Response Description * ============================ ======================================= * * UCHAR WordCount; Count of parameter words = 1 * USHORT DialectIndex; Index of selected dialect * USHORT ByteCount; Count of data bytes = 0 * * If the chosen dialect is greater than core up to and including * LANMAN2.1, the protocol response format is * * Server Response Description * ============================ ======================================= * * UCHAR WordCount; Count of parameter words = 13 * USHORT DialectIndex; Index of selected dialect * USHORT SecurityMode; Security mode: * bit 0: 0 = share, 1 = user * bit 1: 1 = use challenge/response * authentication * USHORT MaxBufferSize; Max transmit buffer size (>= 1024) * USHORT MaxMpxCount; Max pending multiplexed requests * USHORT MaxNumberVcs; Max VCs between client and server * USHORT RawMode; Raw modes supported: * bit 0: 1 = Read Raw supported * bit 1: 1 = Write Raw supported * ULONG SessionKey; Unique token identifying this session * SMB_TIME ServerTime; Current time at server * SMB_DATE ServerDate; Current date at server * USHORT ServerTimeZone; Current time zone at server * USHORT EncryptionKeyLength; MBZ if this is not LM2.1 * USHORT Reserved; MBZ * USHORT ByteCount Count of data bytes * UCHAR EncryptionKey[]; The challenge encryption key * STRING PrimaryDomain[]; The server's primary domain * * MaxBufferSize is the size of the largest message which the client can * legitimately send to the server * * If bit0 of the Flags field is set in the negotiate response, this * indicates the server supports the SMB_COM_LOCK_AND_READ and * SMB_COM_WRITE_AND_UNLOCK client requests. * * If the SecurityMode field indicates the server is running in user mode, * the client must send appropriate SMB_COM_SESSION_SETUP_ANDX requests * before the server will allow the client to access resources. If the * SecurityMode fields indicates the client should use challenge/response * authentication, the client should use the authentication mechanism * specified in section 2.10. * * Clients should submit no more than MaxMpxCount distinct unanswered SMBs * to the server when using multiplexed reads or writes (see sections 5.13 * and 5.25) * * Clients using the "MICROSOFT NETWORKS 1.03" dialect use a different * form of raw reads than documented here, and servers are better off * setting RawMode in this response to 0 for such sessions. * * If the negotiated dialect is "DOS LANMAN2.1" or "LANMAN2.1", then * PrimaryDomain string should be included in this response. * * If the negotiated dialect is NT LM 0.12, the response format is * * Server Response Description * ========================== ========================================= * * UCHAR WordCount; Count of parameter words = 17 * USHORT DialectIndex; Index of selected dialect * UCHAR SecurityMode; Security mode: * bit 0: 0 = share, 1 = user * bit 1: 1 = encrypt passwords * USHORT MaxMpxCount; Max pending multiplexed requests * USHORT MaxNumberVcs; Max VCs between client and server * ULONG MaxBufferSize; Max transmit buffer size * ULONG MaxRawSize; Maximum raw buffer size * ULONG SessionKey; Unique token identifying this session * ULONG Capabilities; Server capabilities * ULONG SystemTimeLow; System (UTC) time of the server (low). * ULONG SystemTimeHigh; System (UTC) time of the server (high). * USHORT ServerTimeZone; Time zone of server (min from UTC) * UCHAR EncryptionKeyLength; Length of encryption key. * USHORT ByteCount; Count of data bytes * UCHAR EncryptionKey[]; The challenge encryption key * UCHAR OemDomainName[]; The name of the domain (in OEM chars) * * In addition to the definitions above, MaxBufferSize is the size of the * largest message which the client can legitimately send to the server. * If the client is using a connectionless protocol, MaxBufferSize must be * set to the smaller of the server's internal buffer size and the amount * of data which can be placed in a response packet. * * MaxRawSize specifies the maximum message size the server can send or * receive for SMB_COM_WRITE_RAW or SMB_COM_READ_RAW. * * Connectionless clients must set Sid to 0 in the SMB request header. * * Capabilities allows the server to tell the client what it supports. * The bit definitions defined in cifs.h. Bit 0x2000 used to be set in * the negotiate response capabilities but it caused problems with * Windows 2000. It is probably not valid, it doesn't appear in the * CIFS spec. * * 4.1.1.1 Errors * * SUCCESS/SUCCESS * ERRSRV/ERRerror */ #include #include #include #include #include #include #include #include #include /* * Maximum buffer size for DOS: chosen to be the same as NT. * Do not change this value, DOS is very sensitive to it. */ #define SMB_DOS_MAXBUF 0x1104 /* * The DOS TCP rcvbuf is set to 8700 because DOS 6.1 seems to have problems * with other values. DOS 6.1 seems to depend on a window value of 8700 to * send the next set of data. If we return a window value of 40KB, after * sending 8700 bytes of data, it will start the next set of data from 40KB * instead of 8.7k. Why 8.7k? We have no idea; it is the value that NT uses. * September 2000. * * IR104720 Increased smb_nt_tcp_rcvbuf from 40KB to just under 1MB to allow * for a larger TCP window sizei based on observations of Windows 2000 and * performance testing. March 2003. */ static uint32_t smb_dos_tcp_rcvbuf = 8700; static uint32_t smb_nt_tcp_rcvbuf = 1048560; /* scale factor of 4 */ static void smb_get_security_info(smb_request_t *, unsigned short *, unsigned char *, unsigned char *, uint32_t *); /* * Function: int smb_com_negotiate(struct smb_request *) */ smb_sdrc_t smb_pre_negotiate(smb_request_t *sr) { DTRACE_SMB_1(op__Negotiate__start, smb_request_t *, sr); return (SDRC_SUCCESS); } void smb_post_negotiate(smb_request_t *sr) { DTRACE_SMB_1(op__Negotiate__done, smb_request_t *, sr); } smb_sdrc_t smb_com_negotiate(smb_request_t *sr) { int dialect = 0; int this_dialect; unsigned char keylen; int sel_pos = -1; int pos; char key[32]; char *p; timestruc_t time_val; unsigned short secmode; uint32_t sesskey; uint32_t capabilities = 0; int rc; unsigned short max_mpx_count; int16_t tz_correction; char ipaddr_buf[INET_ADDRSTRLEN]; if (sr->session->s_state != SMB_SESSION_STATE_ESTABLISHED) { /* The protocol has already been negotiated. */ smbsr_error(sr, 0, ERRSRV, ERRerror); return (SDRC_ERROR); } for (pos = 0; sr->smb_data.chain_offset < sr->smb_data.max_bytes; pos++) { if (smb_mbc_decodef(&sr->smb_data, "%L", sr, &p) != 0) { smbsr_error(sr, 0, ERRSRV, ERRerror); return (SDRC_ERROR); } this_dialect = smb_xlate_dialect_str_to_cd(p); if (this_dialect < 0) continue; if (dialect < this_dialect) { dialect = this_dialect; sel_pos = pos; } } if (sel_pos < 0) { smbsr_error(sr, 0, ERRSRV, ERRerror); return (SDRC_ERROR); } smb_get_security_info(sr, &secmode, (unsigned char *)key, &keylen, &sesskey); (void) microtime(&time_val); tz_correction = sr->sr_gmtoff / 60; switch (dialect) { case DIALECT_UNKNOWN: case PC_NETWORK_PROGRAM_1_0: /* core */ (void) sosetsockopt(sr->session->sock, SOL_SOCKET, SO_RCVBUF, (const void *)&smb_dos_tcp_rcvbuf, sizeof (smb_dos_tcp_rcvbuf)); rc = smbsr_encode_result(sr, 1, 0, "bww", 1, sel_pos, 0); break; case Windows_for_Workgroups_3_1a: case PCLAN1_0: case MICROSOFT_NETWORKS_1_03: case MICROSOFT_NETWORKS_3_0: case LANMAN1_0: case LM1_2X002: case DOS_LM1_2X002: (void) sosetsockopt(sr->session->sock, SOL_SOCKET, SO_RCVBUF, (const void *)&smb_dos_tcp_rcvbuf, sizeof (smb_dos_tcp_rcvbuf)); sr->smb_flg |= SMB_FLAGS_LOCK_AND_READ_OK; rc = smbsr_encode_result(sr, 13, VAR_BCC, "bwwwwwwlYww2.w#c", 13, /* wct */ sel_pos, /* dialect index */ secmode, /* security mode */ SMB_DOS_MAXBUF, /* max buffer size */ 1, /* max MPX (temporary) */ 1, /* max VCs (temporary, ambiguous) */ 3, /* raw mode (s/b 3) */ sesskey, /* session key */ time_val.tv_sec, /* server time/date */ tz_correction, (short)keylen, /* Encryption Key Length */ /* reserved field handled 2. */ VAR_BCC, (int)keylen, key); /* encryption key */ break; case DOS_LANMAN2_1: case LANMAN2_1: (void) sosetsockopt(sr->session->sock, SOL_SOCKET, SO_RCVBUF, (const void *)&smb_dos_tcp_rcvbuf, sizeof (smb_dos_tcp_rcvbuf)); sr->smb_flg |= SMB_FLAGS_LOCK_AND_READ_OK; rc = smbsr_encode_result(sr, 13, VAR_BCC, "bwwwwwwlYww2.w#cs", 13, /* wct */ sel_pos, /* dialect index */ secmode, /* security mode */ SMB_DOS_MAXBUF, /* max buffer size */ 1, /* max MPX (temporary) */ 1, /* max VCs (temporary, ambiguous) */ 3, /* raw mode (s/b 3) */ sesskey, /* session key */ time_val.tv_sec, /* server time/date */ tz_correction, (short)keylen, /* Encryption Key Length */ /* reserved field handled 2. */ VAR_BCC, (int)keylen, key, /* encryption key */ sr->sr_cfg->skc_resource_domain); break; case NT_LM_0_12: (void) sosetsockopt(sr->session->sock, SOL_SOCKET, SO_RCVBUF, (const void *)&smb_nt_tcp_rcvbuf, sizeof (smb_nt_tcp_rcvbuf)); capabilities = CAP_LARGE_FILES | CAP_NT_SMBS | CAP_STATUS32 | CAP_NT_FIND | CAP_RAW_MODE | CAP_LEVEL_II_OPLOCKS | CAP_LOCK_AND_READ | CAP_RPC_REMOTE_APIS | CAP_LARGE_READX; /* * UNICODE support is required to enable support for long * share names and long file names and streams. */ capabilities |= CAP_UNICODE; /* * Turn off Extended Security Negotiation */ sr->smb_flg2 &= ~SMB_FLAGS2_EXT_SEC; /* * Allow SMB signatures if security challenge response enabled */ if ((secmode & NEGOTIATE_SECURITY_CHALLENGE_RESPONSE) && sr->sr_cfg->skc_signing_enable) { secmode |= NEGOTIATE_SECURITY_SIGNATURES_ENABLED; if (sr->sr_cfg->skc_signing_required) secmode |= NEGOTIATE_SECURITY_SIGNATURES_REQUIRED; sr->session->secmode = secmode; } (void) inet_ntop(AF_INET, (char *)&sr->session->ipaddr, ipaddr_buf, sizeof (ipaddr_buf)); max_mpx_count = sr->sr_cfg->skc_maxworkers; rc = smbsr_encode_result(sr, 17, VAR_BCC, "bwbwwllllTwbw#cZ", 17, /* wct */ sel_pos, /* dialect index */ secmode, /* security mode */ max_mpx_count, /* max MPX (temporary) */ 1, /* max VCs (temporary, ambiguous) */ (DWORD)smb_maxbufsize, /* max buffer size */ 0xFFFF, /* max raw size */ sesskey, /* session key */ capabilities, &time_val, /* system time */ tz_correction, keylen, /* Encryption Key Length */ VAR_BCC, (int)keylen, key, /* encryption key */ sr->sr_cfg->skc_resource_domain); break; default: smbsr_error(sr, 0, ERRSRV, ERRerror); return (SDRC_ERROR); } if (rc != 0) return (SDRC_ERROR); /* * Save the agreed dialect. Note that this value is also * used to detect and reject attempts to re-negotiate. */ sr->session->dialect = dialect; sr->session->s_state = SMB_SESSION_STATE_NEGOTIATED; return (SDRC_SUCCESS); } static void smb_get_security_info( struct smb_request *sr, unsigned short *secmode, unsigned char *key, unsigned char *keylen, uint32_t *sesskey) { uchar_t tmp_key[8]; (void) random_get_pseudo_bytes(tmp_key, 8); bcopy(tmp_key, &sr->session->challenge_key, 8); sr->session->challenge_len = 8; *keylen = 8; bcopy(tmp_key, key, 8); sr->session->secmode = NEGOTIATE_SECURITY_CHALLENGE_RESPONSE| NEGOTIATE_SECURITY_USER_LEVEL; (void) random_get_pseudo_bytes(tmp_key, 4); sr->session->sesskey = tmp_key[0] | tmp_key[1] << 8 | tmp_key[2] << 16 | tmp_key[3] << 24; *secmode = sr->session->secmode; *sesskey = sr->session->sesskey; }