diff options
Diffstat (limited to 'source4/smbd/process.c')
| -rw-r--r-- | source4/smbd/process.c | 833 |
1 files changed, 833 insertions, 0 deletions
diff --git a/source4/smbd/process.c b/source4/smbd/process.c new file mode 100644 index 0000000000..a4e67c7ff1 --- /dev/null +++ b/source4/smbd/process.c @@ -0,0 +1,833 @@ +/* + Unix SMB/CIFS implementation. + process incoming packets - main loop + Copyright (C) Andrew Tridgell 1992-2003 + Copyright (C) James J Myers 2003 <myersjj@samba.org> + + This program is free software; you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation; either version 2 of the License, or + (at your option) any later version. + + This program is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program; if not, write to the Free Software + Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. +*/ + +#include "includes.h" + +SIG_ATOMIC_T reload_after_sighup = 0; +SIG_ATOMIC_T got_sig_term = 0; + +/* + send an oplock break request to a client +*/ +BOOL req_send_oplock_break(struct tcon_context *conn, uint16 fnum, uint8 level) +{ + struct request_context *req; + + req = init_smb_request(conn->smb); + + req_setup_reply(req, 8, 0); + + SCVAL(req->out.hdr,HDR_COM,SMBlockingX); + SSVAL(req->out.hdr,HDR_TID,conn->cnum); + SSVAL(req->out.hdr,HDR_PID,0xFFFF); + SSVAL(req->out.hdr,HDR_UID,0); + SSVAL(req->out.hdr,HDR_MID,0xFFFF); + SCVAL(req->out.hdr,HDR_FLG,0); + SSVAL(req->out.hdr,HDR_FLG2,0); + + SSVAL(req->out.vwv, VWV(0), SMB_CHAIN_NONE); + SSVAL(req->out.vwv, VWV(1), 0); + SSVAL(req->out.vwv, VWV(2), fnum); + SSVAL(req->out.vwv, VWV(3), level); + SIVAL(req->out.vwv, VWV(4), 0); + SSVAL(req->out.vwv, VWV(6), 0); + SSVAL(req->out.vwv, VWV(7), 0); + + req_send_reply(req); + return True; +} + +/**************************************************************************** +receive a SMB request from the wire, forming a request_context from the result +****************************************************************************/ +static struct request_context *receive_smb_request(struct server_context *smb) +{ + ssize_t len, len2; + char header[4]; + struct request_context *req; + + len = read_data(smb->socket.fd, header, 4); + if (len != 4) { + return NULL; + } + + len = smb_len(header); + + req = init_smb_request(smb); + + GetTimeOfDay(&req->request_time); + req->chained_fnum = -1; + + /* allocate the incoming buffer at the right size */ + req->in.buffer = talloc(req->mem_ctx, len + NBT_HDR_SIZE); + + /* fill in the already received header */ + memcpy(req->in.buffer, header, 4); + + len2 = read_data(smb->socket.fd, req->in.buffer + NBT_HDR_SIZE, len); + if (len2 != len) { + return NULL; + } + + /* fill in the rest of the req->in structure */ + req->in.size = len + NBT_HDR_SIZE; + req->in.allocated = req->in.size; + req->in.hdr = req->in.buffer + NBT_HDR_SIZE; + req->in.vwv = req->in.hdr + HDR_VWV; + req->in.wct = CVAL(req->in.hdr, HDR_WCT); + if (req->in.vwv + VWV(req->in.wct) <= req->in.buffer + req->in.size) { + req->in.data = req->in.vwv + VWV(req->in.wct) + 2; + req->in.data_size = SVAL(req->in.vwv, VWV(req->in.wct)); + + /* the bcc length is only 16 bits, but some packets + (such as SMBwriteX) can be much larger than 64k. We + detect this by looking for a large non-chained NBT + packet (at least 64k bigger than what is + specified). If it is detected then the NBT size is + used instead of the bcc size */ + if (req->in.data_size + 0x10000 <= + req->in.size - PTR_DIFF(req->in.data, req->in.buffer) && + (req->in.wct < 1 || SVAL(req->in.vwv, VWV(0)) == SMB_CHAIN_NONE)) { + /* its an oversized packet! fun for all the family */ + req->in.data_size = req->in.size - PTR_DIFF(req->in.data,req->in.buffer); + } + } + + return req; +} + +/* + setup the user_ctx element of a request +*/ +static void setup_user_context(struct request_context *req) +{ + struct user_context *ctx; + + ctx = talloc(req->mem_ctx, sizeof(*ctx)); + ctx->vuid = SVAL(req->in.hdr, HDR_UID); + ctx->vuser = get_valid_user_struct(req->smb, ctx->vuid); + + req->user_ctx = ctx; +} + + +/* +These flags determine some of the permissions required to do an operation + +Note that I don't set NEED_WRITE on some write operations because they +are used by some brain-dead clients when printing, and I don't want to +force write permissions on print services. +*/ +#define AS_USER (1<<0) +#define NEED_WRITE (1<<1) +#define TIME_INIT (1<<2) +#define CAN_IPC (1<<3) +#define AS_GUEST (1<<5) +#define USE_MUTEX (1<<7) + +/* + define a list of possible SMB messages and their corresponding + functions. Any message that has a NULL function is unimplemented - + please feel free to contribute implementations! +*/ +static const struct smb_message_struct +{ + const char *name; + void (*fn)(struct request_context *); + int flags; +} + smb_messages[256] = { +/* 0x00 */ { "SMBmkdir",reply_mkdir,AS_USER | NEED_WRITE}, +/* 0x01 */ { "SMBrmdir",reply_rmdir,AS_USER | NEED_WRITE}, +/* 0x02 */ { "SMBopen",reply_open,AS_USER }, +/* 0x03 */ { "SMBcreate",reply_mknew,AS_USER}, +/* 0x04 */ { "SMBclose",reply_close,AS_USER | CAN_IPC }, +/* 0x05 */ { "SMBflush",reply_flush,AS_USER}, +/* 0x06 */ { "SMBunlink",reply_unlink,AS_USER | NEED_WRITE }, +/* 0x07 */ { "SMBmv",reply_mv,AS_USER | NEED_WRITE }, +/* 0x08 */ { "SMBgetatr",reply_getatr,AS_USER}, +/* 0x09 */ { "SMBsetatr",reply_setatr,AS_USER | NEED_WRITE}, +/* 0x0a */ { "SMBread",reply_read,AS_USER}, +/* 0x0b */ { "SMBwrite",reply_write,AS_USER | CAN_IPC }, +/* 0x0c */ { "SMBlock",reply_lock,AS_USER}, +/* 0x0d */ { "SMBunlock",reply_unlock,AS_USER}, +/* 0x0e */ { "SMBctemp",reply_ctemp,AS_USER }, +/* 0x0f */ { "SMBmknew",reply_mknew,AS_USER}, +/* 0x10 */ { "SMBchkpth",reply_chkpth,AS_USER}, +/* 0x11 */ { "SMBexit",reply_exit,0}, +/* 0x12 */ { "SMBlseek",reply_lseek,AS_USER}, +/* 0x13 */ { "SMBlockread",reply_lockread,AS_USER}, +/* 0x14 */ { "SMBwriteunlock",reply_writeunlock,AS_USER}, +/* 0x15 */ { NULL, NULL, 0 }, +/* 0x16 */ { NULL, NULL, 0 }, +/* 0x17 */ { NULL, NULL, 0 }, +/* 0x18 */ { NULL, NULL, 0 }, +/* 0x19 */ { NULL, NULL, 0 }, +/* 0x1a */ { "SMBreadbraw",reply_readbraw,AS_USER}, +/* 0x1b */ { "SMBreadBmpx",reply_readbmpx,AS_USER}, +/* 0x1c */ { "SMBreadBs",NULL,0 }, +/* 0x1d */ { "SMBwritebraw",reply_writebraw,AS_USER}, +/* 0x1e */ { "SMBwriteBmpx",reply_writebmpx,AS_USER}, +/* 0x1f */ { "SMBwriteBs",reply_writebs,AS_USER}, +/* 0x20 */ { "SMBwritec",NULL,0}, +/* 0x21 */ { NULL, NULL, 0 }, +/* 0x22 */ { "SMBsetattrE",reply_setattrE,AS_USER | NEED_WRITE }, +/* 0x23 */ { "SMBgetattrE",reply_getattrE,AS_USER }, +/* 0x24 */ { "SMBlockingX",reply_lockingX,AS_USER }, +/* 0x25 */ { "SMBtrans",reply_trans,AS_USER | CAN_IPC }, +/* 0x26 */ { "SMBtranss",NULL,AS_USER | CAN_IPC}, +/* 0x27 */ { "SMBioctl",reply_ioctl,0}, +/* 0x28 */ { "SMBioctls",NULL,AS_USER}, +/* 0x29 */ { "SMBcopy",reply_copy,AS_USER | NEED_WRITE }, +/* 0x2a */ { "SMBmove",NULL,AS_USER | NEED_WRITE }, +/* 0x2b */ { "SMBecho",reply_echo,0}, +/* 0x2c */ { "SMBwriteclose",reply_writeclose,AS_USER}, +/* 0x2d */ { "SMBopenX",reply_open_and_X,AS_USER | CAN_IPC }, +/* 0x2e */ { "SMBreadX",reply_read_and_X,AS_USER | CAN_IPC }, +/* 0x2f */ { "SMBwriteX",reply_write_and_X,AS_USER | CAN_IPC }, +/* 0x30 */ { NULL, NULL, 0 }, +/* 0x31 */ { NULL, NULL, 0 }, +/* 0x32 */ { "SMBtrans2", reply_trans2, AS_USER | CAN_IPC }, +/* 0x33 */ { "SMBtranss2", reply_transs2, AS_USER}, +/* 0x34 */ { "SMBfindclose", reply_findclose,AS_USER}, +/* 0x35 */ { "SMBfindnclose", reply_findnclose, AS_USER}, +/* 0x36 */ { NULL, NULL, 0 }, +/* 0x37 */ { NULL, NULL, 0 }, +/* 0x38 */ { NULL, NULL, 0 }, +/* 0x39 */ { NULL, NULL, 0 }, +/* 0x3a */ { NULL, NULL, 0 }, +/* 0x3b */ { NULL, NULL, 0 }, +/* 0x3c */ { NULL, NULL, 0 }, +/* 0x3d */ { NULL, NULL, 0 }, +/* 0x3e */ { NULL, NULL, 0 }, +/* 0x3f */ { NULL, NULL, 0 }, +/* 0x40 */ { NULL, NULL, 0 }, +/* 0x41 */ { NULL, NULL, 0 }, +/* 0x42 */ { NULL, NULL, 0 }, +/* 0x43 */ { NULL, NULL, 0 }, +/* 0x44 */ { NULL, NULL, 0 }, +/* 0x45 */ { NULL, NULL, 0 }, +/* 0x46 */ { NULL, NULL, 0 }, +/* 0x47 */ { NULL, NULL, 0 }, +/* 0x48 */ { NULL, NULL, 0 }, +/* 0x49 */ { NULL, NULL, 0 }, +/* 0x4a */ { NULL, NULL, 0 }, +/* 0x4b */ { NULL, NULL, 0 }, +/* 0x4c */ { NULL, NULL, 0 }, +/* 0x4d */ { NULL, NULL, 0 }, +/* 0x4e */ { NULL, NULL, 0 }, +/* 0x4f */ { NULL, NULL, 0 }, +/* 0x50 */ { NULL, NULL, 0 }, +/* 0x51 */ { NULL, NULL, 0 }, +/* 0x52 */ { NULL, NULL, 0 }, +/* 0x53 */ { NULL, NULL, 0 }, +/* 0x54 */ { NULL, NULL, 0 }, +/* 0x55 */ { NULL, NULL, 0 }, +/* 0x56 */ { NULL, NULL, 0 }, +/* 0x57 */ { NULL, NULL, 0 }, +/* 0x58 */ { NULL, NULL, 0 }, +/* 0x59 */ { NULL, NULL, 0 }, +/* 0x5a */ { NULL, NULL, 0 }, +/* 0x5b */ { NULL, NULL, 0 }, +/* 0x5c */ { NULL, NULL, 0 }, +/* 0x5d */ { NULL, NULL, 0 }, +/* 0x5e */ { NULL, NULL, 0 }, +/* 0x5f */ { NULL, NULL, 0 }, +/* 0x60 */ { NULL, NULL, 0 }, +/* 0x61 */ { NULL, NULL, 0 }, +/* 0x62 */ { NULL, NULL, 0 }, +/* 0x63 */ { NULL, NULL, 0 }, +/* 0x64 */ { NULL, NULL, 0 }, +/* 0x65 */ { NULL, NULL, 0 }, +/* 0x66 */ { NULL, NULL, 0 }, +/* 0x67 */ { NULL, NULL, 0 }, +/* 0x68 */ { NULL, NULL, 0 }, +/* 0x69 */ { NULL, NULL, 0 }, +/* 0x6a */ { NULL, NULL, 0 }, +/* 0x6b */ { NULL, NULL, 0 }, +/* 0x6c */ { NULL, NULL, 0 }, +/* 0x6d */ { NULL, NULL, 0 }, +/* 0x6e */ { NULL, NULL, 0 }, +/* 0x6f */ { NULL, NULL, 0 }, +/* 0x70 */ { "SMBtcon",reply_tcon,USE_MUTEX}, +/* 0x71 */ { "SMBtdis",reply_tdis,0}, +/* 0x72 */ { "SMBnegprot",reply_negprot,USE_MUTEX}, +/* 0x73 */ { "SMBsesssetupX",reply_sesssetup,USE_MUTEX}, +/* 0x74 */ { "SMBulogoffX", reply_ulogoffX, 0}, /* ulogoff doesn't give a valid TID */ +/* 0x75 */ { "SMBtconX",reply_tcon_and_X,USE_MUTEX}, +/* 0x76 */ { NULL, NULL, 0 }, +/* 0x77 */ { NULL, NULL, 0 }, +/* 0x78 */ { NULL, NULL, 0 }, +/* 0x79 */ { NULL, NULL, 0 }, +/* 0x7a */ { NULL, NULL, 0 }, +/* 0x7b */ { NULL, NULL, 0 }, +/* 0x7c */ { NULL, NULL, 0 }, +/* 0x7d */ { NULL, NULL, 0 }, +/* 0x7e */ { NULL, NULL, 0 }, +/* 0x7f */ { NULL, NULL, 0 }, +/* 0x80 */ { "SMBdskattr",reply_dskattr,AS_USER}, +/* 0x81 */ { "SMBsearch",reply_search,AS_USER}, +/* 0x82 */ { "SMBffirst",reply_search,AS_USER}, +/* 0x83 */ { "SMBfunique",reply_search,AS_USER}, +/* 0x84 */ { "SMBfclose",reply_fclose,AS_USER}, +/* 0x85 */ { NULL, NULL, 0 }, +/* 0x86 */ { NULL, NULL, 0 }, +/* 0x87 */ { NULL, NULL, 0 }, +/* 0x88 */ { NULL, NULL, 0 }, +/* 0x89 */ { NULL, NULL, 0 }, +/* 0x8a */ { NULL, NULL, 0 }, +/* 0x8b */ { NULL, NULL, 0 }, +/* 0x8c */ { NULL, NULL, 0 }, +/* 0x8d */ { NULL, NULL, 0 }, +/* 0x8e */ { NULL, NULL, 0 }, +/* 0x8f */ { NULL, NULL, 0 }, +/* 0x90 */ { NULL, NULL, 0 }, +/* 0x91 */ { NULL, NULL, 0 }, +/* 0x92 */ { NULL, NULL, 0 }, +/* 0x93 */ { NULL, NULL, 0 }, +/* 0x94 */ { NULL, NULL, 0 }, +/* 0x95 */ { NULL, NULL, 0 }, +/* 0x96 */ { NULL, NULL, 0 }, +/* 0x97 */ { NULL, NULL, 0 }, +/* 0x98 */ { NULL, NULL, 0 }, +/* 0x99 */ { NULL, NULL, 0 }, +/* 0x9a */ { NULL, NULL, 0 }, +/* 0x9b */ { NULL, NULL, 0 }, +/* 0x9c */ { NULL, NULL, 0 }, +/* 0x9d */ { NULL, NULL, 0 }, +/* 0x9e */ { NULL, NULL, 0 }, +/* 0x9f */ { NULL, NULL, 0 }, +/* 0xa0 */ { "SMBnttrans", reply_nttrans, AS_USER | CAN_IPC }, +/* 0xa1 */ { "SMBnttranss", reply_nttranss, AS_USER | CAN_IPC }, +/* 0xa2 */ { "SMBntcreateX", reply_ntcreate_and_X, AS_USER | CAN_IPC }, +/* 0xa3 */ { NULL, NULL, 0 }, +/* 0xa4 */ { "SMBntcancel", reply_ntcancel, 0 }, +/* 0xa5 */ { NULL, NULL, 0 }, +/* 0xa6 */ { NULL, NULL, 0 }, +/* 0xa7 */ { NULL, NULL, 0 }, +/* 0xa8 */ { NULL, NULL, 0 }, +/* 0xa9 */ { NULL, NULL, 0 }, +/* 0xaa */ { NULL, NULL, 0 }, +/* 0xab */ { NULL, NULL, 0 }, +/* 0xac */ { NULL, NULL, 0 }, +/* 0xad */ { NULL, NULL, 0 }, +/* 0xae */ { NULL, NULL, 0 }, +/* 0xaf */ { NULL, NULL, 0 }, +/* 0xb0 */ { NULL, NULL, 0 }, +/* 0xb1 */ { NULL, NULL, 0 }, +/* 0xb2 */ { NULL, NULL, 0 }, +/* 0xb3 */ { NULL, NULL, 0 }, +/* 0xb4 */ { NULL, NULL, 0 }, +/* 0xb5 */ { NULL, NULL, 0 }, +/* 0xb6 */ { NULL, NULL, 0 }, +/* 0xb7 */ { NULL, NULL, 0 }, +/* 0xb8 */ { NULL, NULL, 0 }, +/* 0xb9 */ { NULL, NULL, 0 }, +/* 0xba */ { NULL, NULL, 0 }, +/* 0xbb */ { NULL, NULL, 0 }, +/* 0xbc */ { NULL, NULL, 0 }, +/* 0xbd */ { NULL, NULL, 0 }, +/* 0xbe */ { NULL, NULL, 0 }, +/* 0xbf */ { NULL, NULL, 0 }, +/* 0xc0 */ { "SMBsplopen",reply_printopen,AS_USER }, +/* 0xc1 */ { "SMBsplwr",reply_printwrite,AS_USER}, +/* 0xc2 */ { "SMBsplclose",reply_printclose,AS_USER}, +/* 0xc3 */ { "SMBsplretq",reply_printqueue,AS_USER}, +/* 0xc4 */ { NULL, NULL, 0 }, +/* 0xc5 */ { NULL, NULL, 0 }, +/* 0xc6 */ { NULL, NULL, 0 }, +/* 0xc7 */ { NULL, NULL, 0 }, +/* 0xc8 */ { NULL, NULL, 0 }, +/* 0xc9 */ { NULL, NULL, 0 }, +/* 0xca */ { NULL, NULL, 0 }, +/* 0xcb */ { NULL, NULL, 0 }, +/* 0xcc */ { NULL, NULL, 0 }, +/* 0xcd */ { NULL, NULL, 0 }, +/* 0xce */ { NULL, NULL, 0 }, +/* 0xcf */ { NULL, NULL, 0 }, +/* 0xd0 */ { "SMBsends",reply_sends,AS_GUEST}, +/* 0xd1 */ { "SMBsendb",NULL,AS_GUEST}, +/* 0xd2 */ { "SMBfwdname",NULL,AS_GUEST}, +/* 0xd3 */ { "SMBcancelf",NULL,AS_GUEST}, +/* 0xd4 */ { "SMBgetmac",NULL,AS_GUEST}, +/* 0xd5 */ { "SMBsendstrt",reply_sendstrt,AS_GUEST}, +/* 0xd6 */ { "SMBsendend",reply_sendend,AS_GUEST}, +/* 0xd7 */ { "SMBsendtxt",reply_sendtxt,AS_GUEST}, +/* 0xd8 */ { NULL, NULL, 0 }, +/* 0xd9 */ { NULL, NULL, 0 }, +/* 0xda */ { NULL, NULL, 0 }, +/* 0xdb */ { NULL, NULL, 0 }, +/* 0xdc */ { NULL, NULL, 0 }, +/* 0xdd */ { NULL, NULL, 0 }, +/* 0xde */ { NULL, NULL, 0 }, +/* 0xdf */ { NULL, NULL, 0 }, +/* 0xe0 */ { NULL, NULL, 0 }, +/* 0xe1 */ { NULL, NULL, 0 }, +/* 0xe2 */ { NULL, NULL, 0 }, +/* 0xe3 */ { NULL, NULL, 0 }, +/* 0xe4 */ { NULL, NULL, 0 }, +/* 0xe5 */ { NULL, NULL, 0 }, +/* 0xe6 */ { NULL, NULL, 0 }, +/* 0xe7 */ { NULL, NULL, 0 }, +/* 0xe8 */ { NULL, NULL, 0 }, +/* 0xe9 */ { NULL, NULL, 0 }, +/* 0xea */ { NULL, NULL, 0 }, +/* 0xeb */ { NULL, NULL, 0 }, +/* 0xec */ { NULL, NULL, 0 }, +/* 0xed */ { NULL, NULL, 0 }, +/* 0xee */ { NULL, NULL, 0 }, +/* 0xef */ { NULL, NULL, 0 }, +/* 0xf0 */ { NULL, NULL, 0 }, +/* 0xf1 */ { NULL, NULL, 0 }, +/* 0xf2 */ { NULL, NULL, 0 }, +/* 0xf3 */ { NULL, NULL, 0 }, +/* 0xf4 */ { NULL, NULL, 0 }, +/* 0xf5 */ { NULL, NULL, 0 }, +/* 0xf6 */ { NULL, NULL, 0 }, +/* 0xf7 */ { NULL, NULL, 0 }, +/* 0xf8 */ { NULL, NULL, 0 }, +/* 0xf9 */ { NULL, NULL, 0 }, +/* 0xfa */ { NULL, NULL, 0 }, +/* 0xfb */ { NULL, NULL, 0 }, +/* 0xfc */ { NULL, NULL, 0 }, +/* 0xfd */ { NULL, NULL, 0 }, +/* 0xfe */ { NULL, NULL, 0 }, +/* 0xff */ { NULL, NULL, 0 } +}; + +/**************************************************************************** +return a string containing the function name of a SMB command +****************************************************************************/ +static const char *smb_fn_name(uint8 type) +{ + const char *unknown_name = "SMBunknown"; + + if (smb_messages[type].name == NULL) + return unknown_name; + + return smb_messages[type].name; +} + + +/**************************************************************************** + Do a switch on the message type and call the specific reply function for this +message. Unlike earlier versions of Samba the reply functions are responsible +for sending the reply themselves, rather than returning a size to this function +The reply functions may also choose to delay the processing by pushing the message +onto the message queue +****************************************************************************/ +static void switch_message(int type, struct request_context *req) +{ + int flags; + uint16 session_tag; + struct server_context *smb = req->smb; + + type &= 0xff; + + errno = 0; + + if (smb_messages[type].fn == NULL) { + DEBUG(0,("Unknown message type %d!\n",type)); + reply_unknown(req); + return; + } + + flags = smb_messages[type].flags; + + /* In share mode security we must ignore the vuid. */ + session_tag = (lp_security() == SEC_SHARE) ? + UID_FIELD_INVALID : + SVAL(req->in.hdr,HDR_UID); + + req->conn = conn_find(req->smb, SVAL(req->in.hdr,HDR_TID)); + + /* setup the user context for this request */ + setup_user_context(req); + + /* Ensure this value is replaced in the incoming packet. */ + SSVAL(req->in.hdr,HDR_UID,session_tag); + + if (req->user_ctx) { + req->user_ctx->vuid = session_tag; + } + DEBUG(3,("switch message %s (task_id %d)\n",smb_fn_name(type), smb->model_ops->get_id(req))); + + /* does this protocol need to be run as root? */ + if (!(flags & AS_USER)) { + change_to_root_user(); + } + + /* does this protocol need a valid tree connection? */ + if ((flags & AS_USER) && !req->conn) { + req_reply_error(req, NT_STATUS_NETWORK_NAME_DELETED); + return; + } + + /* does this protocol need to be run as the connected user? */ +#if HACK_REWRITE + if ((flags & AS_USER) && !change_to_user(req->conn,session_tag)) { + if (!(flags & AS_GUEST)) { + req_reply_error(req, NT_STATUS_ACCESS_DENIED); + return; + } + + /* we'll run it as guest */ + flags &= ~AS_USER; + } +#endif + + /* this code is to work around a bug is MS client 3 without + introducing a security hole - it needs to be able to do + print queue checks as guest if it isn't logged in properly */ + if (flags & AS_USER) { + flags &= ~AS_GUEST; + } + + /* does it need write permission? */ + if ((flags & NEED_WRITE) && !CAN_WRITE(req->conn)) { + req_reply_error(req, NT_STATUS_ACCESS_DENIED); + return; + } + + /* ipc services are limited */ + if (req->conn && req->conn->type == NTVFS_IPC && (flags & AS_USER) && !(flags & CAN_IPC)) { + req_reply_error(req, NT_STATUS_ACCESS_DENIED); + return; + } + + /* load service specific parameters */ + if (req->conn && !set_current_service(req->conn,(flags & AS_USER)?True:False)) { + req_reply_error(req, NT_STATUS_ACCESS_DENIED); + return; + } + + /* does this protocol need to be run as guest? */ +#if HACK_REWRITE + if ((flags & AS_GUEST) && + !change_to_guest()) { + req_reply_error(req, NT_STATUS_ACCESS_DENIED); + return; + } +#endif + /* THREAD TESTING: use mutex to serialize calls to critical functions with global state */ + if (flags & USE_MUTEX) { + MUTEX_LOCK_BY_ID(MUTEX_SMBD); + } + smb_messages[type].fn(req); + if (flags & USE_MUTEX) { + MUTEX_UNLOCK_BY_ID(MUTEX_SMBD); + } +} + + +/**************************************************************************** + Construct a reply to the incoming packet. +****************************************************************************/ +static void construct_reply(struct request_context *req) +{ + uint8 type = CVAL(req->in.hdr,HDR_COM); + + /* see if its a special NBT packet */ + if (CVAL(req->in.buffer,0) != 0) { + reply_special(req); + return; + } + + + /* Make sure this is an SMB packet */ + if (memcmp(req->in.hdr,"\377SMB",4) != 0) { + DEBUG(2,("Non-SMB packet of length %d. Terminating connection\n", + req->in.size)); + exit_server(req->smb, "Non-SMB packet"); + return; + } + + if (NBT_HDR_SIZE + MIN_SMB_SIZE + 2*req->in.wct > req->in.size) { + DEBUG(2,("Invalid SMB word count %d\n", req->in.wct)); + exit_server(req->smb, "Invalid SMB packet"); + return; + } + + if (NBT_HDR_SIZE + MIN_SMB_SIZE + 2*req->in.wct + req->in.data_size > req->in.size) { + DEBUG(2,("Invalid SMB buffer length count %d\n", req->in.data_size)); + exit_server(req->smb, "Invalid SMB packet"); + return; + } + + + req->smbpid = SVAL(req->in.hdr,HDR_PID); + req->flags = CVAL(req->in.hdr, HDR_FLG); + req->flags2 = SVAL(req->in.hdr, HDR_FLG2); + + switch_message(type, req); +} + + +/* + we call this when first first part of a possibly chained request has been completed + and we need to call the 2nd part, if any +*/ +void chain_reply(struct request_context *req) +{ + uint16 chain_cmd, chain_offset; + char *vwv, *data; + uint16 wct; + uint16 data_size; + + if (req->in.wct < 2 || req->out.wct < 2) { + req_reply_dos_error(req, ERRSRV, ERRerror); + return; + } + + chain_cmd = CVAL(req->in.vwv, VWV(0)); + chain_offset = SVAL(req->in.vwv, VWV(1)); + + if (chain_cmd == SMB_CHAIN_NONE) { + /* end of chain */ + SSVAL(req->out.vwv, VWV(0), SMB_CHAIN_NONE); + SSVAL(req->out.vwv, VWV(1), 0); + req_send_reply(req); + return; + } + + if (chain_offset + req->in.hdr >= req->in.buffer + req->in.size) { + goto error; + } + + wct = CVAL(req->in.hdr, chain_offset); + vwv = req->in.hdr + chain_offset + 1; + + if (vwv + VWV(wct) + 2 > req->in.buffer + req->in.size) { + goto error; + } + + data_size = SVAL(vwv, VWV(wct)); + data = vwv + VWV(wct) + 2; + + if (data + data_size > req->in.buffer + req->in.size) { + goto error; + } + + /* all seems legit */ + req->in.vwv = vwv; + req->in.wct = wct; + req->in.data = data; + req->in.data_size = data_size; + req->in.ptr = data; + + req->chain_count++; + + SSVAL(req->out.vwv, VWV(0), chain_cmd); + SSVAL(req->out.vwv, VWV(1), req->out.size - NBT_HDR_SIZE); + + /* the current request in the chain might have used an async reply, + but that doesn't mean the next element needs to */ + ZERO_STRUCT(req->async); + req->control_flags &= ~REQ_CONTROL_ASYNC; + + switch_message(chain_cmd, req); + return; + +error: + SSVAL(req->out.vwv, VWV(0), SMB_CHAIN_NONE); + SSVAL(req->out.vwv, VWV(1), 0); + req_reply_dos_error(req, ERRSRV, ERRerror); +} + + +/* + close the socket and shutdown a server_context +*/ +void server_terminate(struct server_context *smb) +{ + close(smb->socket.fd); + event_remove_fd_all(smb->events, smb->socket.fd); + + conn_close_all(smb); + + talloc_destroy(smb->mem_ctx); +} + + +/* + called when a SMB socket becomes readable +*/ +static void smbd_read_handler(struct event_context *ev, struct fd_event *fde, + time_t t, uint16 flags) +{ + struct request_context *req; + struct server_context *smb = fde->private; + + req = receive_smb_request(smb); + if (!req) { + smb->model_ops->terminate_connection(smb, "receive error"); + return; + } + + construct_reply(req); + + /* free up temporary memory */ + lp_talloc_free(); +} + + +/* + process a message from an SMB socket while still processing a + previous message this is used by backends who need to ensure that + new messages from clients are still processed while they are + performing long operations +*/ +void smbd_process_async(struct server_context *smb) +{ + struct request_context *req; + + req = receive_smb_request(smb); + if (!req) { + smb->model_ops->terminate_connection(smb, "receive error"); + return; + } + + construct_reply(req); +} + + +/* + initialise a server_context from a open socket and register a event handler + for reading from that socket +*/ +void init_smbsession(struct event_context *ev, struct model_ops *model_ops, int fd) +{ + struct server_context *smb; + TALLOC_CTX *mem_ctx; + struct fd_event fde; + + set_socket_options(fd,"SO_KEEPALIVE"); + set_socket_options(fd, lp_socket_options()); + + mem_ctx = talloc_init("server_context"); + + smb = (struct server_context *)talloc(mem_ctx, sizeof(*smb)); + if (!smb) return; + + ZERO_STRUCTP(smb); + + smb->mem_ctx = mem_ctx; + smb->socket.fd = fd; + smb->pid = getpid(); + + sub_set_context(&smb->substitute); + + /* set an initial client name based on its IP address. This will be replaced with + the netbios name later if it gives us one */ + sub_set_remote_machine(strdup(get_socket_addr(smb->mem_ctx, fd))); + smb->socket.client_addr = talloc_strdup(smb->mem_ctx, get_socket_addr(smb->mem_ctx, fd)); + + /* now initialise a few default values associated with this smb socket */ + smb->negotiate.max_send = 0xFFFF; + + /* this is the size that w2k uses, and it appears to be important for + good performance */ + smb->negotiate.max_recv = 4356; + + smb->users.next_vuid = VUID_OFFSET; + + smb->events = ev; + smb->model_ops = model_ops; + + conn_init(smb); + + /* setup a event handler for this socket. We are initially + only interested in reading from the socket */ + fde.fd = fd; + fde.handler = smbd_read_handler; + fde.private = smb; + fde.flags = EVENT_FD_READ; + + event_add_fd(ev, &fde); +} + + +/* + * initialize an smb process + */ +void smbd_process_init(void) +{ + TALLOC_CTX *mem_ctx; + + mem_ctx = talloc_init("smbd_process_init talloc"); + if (!mem_ctx) { + DEBUG(0,("smbd_process_init: ERROR: No memory\n")); + exit(1); + } + namecache_enable(); + + if (!locking_init(0)) + exit(1); + + if (!share_info_db_init()) + exit(1); + + if (!init_registry()) + exit(1); + + if(!initialize_password_db(False)) + exit(1); + + /* possibly reload the services file. */ + reload_services(NULL, True); + + if(!get_global_sam_sid()) { + DEBUG(0,("ERROR: Samba cannot create a SAM SID.\n")); + exit(1); + } + + if (!init_account_policy()) { + DEBUG(0,("Could not open account policy tdb.\n")); + exit(1); + } + + if (*lp_rootdir()) { + if (sys_chroot(lp_rootdir()) == 0) + DEBUG(2,("Changed root to %s\n", lp_rootdir())); + } + + /* Setup oplocks */ + if (!init_oplocks()) + exit(1); + + /* Setup change notify */ + if (!init_change_notify()) + exit(1); + + /* Setup privileges database */ + if (!privilege_init()) + exit(1); + + /* Setup the NTVFS subsystem */ + if (!ntvfs_init()) + exit(1); + + /* re-initialise the timezone */ + TimeInit(); + + talloc_destroy(mem_ctx); +} + |