diff options
Diffstat (limited to 'source4/smb_server/smb/receive.c')
| -rw-r--r-- | source4/smb_server/smb/receive.c | 227 |
1 files changed, 119 insertions, 108 deletions
diff --git a/source4/smb_server/smb/receive.c b/source4/smb_server/smb/receive.c index e3d247cbc0..6cf33cf7c3 100644 --- a/source4/smb_server/smb/receive.c +++ b/source4/smb_server/smb/receive.c @@ -65,111 +65,16 @@ NTSTATUS smbsrv_send_oplock_break(void *p, struct ntvfs_handle *ntvfs, uint8_t l static void switch_message(int type, struct smbsrv_request *req); -/**************************************************************************** -receive a SMB request header from the wire, forming a request_context -from the result -****************************************************************************/ -NTSTATUS smbsrv_recv_smb_request(void *private, DATA_BLOB blob) -{ - struct smbsrv_connection *smb_conn = talloc_get_type(private, struct smbsrv_connection); - struct smbsrv_request *req; - struct timeval cur_time = timeval_current(); - uint8_t command; - - smb_conn->statistics.last_request_time = cur_time; - - /* see if its a special NBT packet */ - if (CVAL(blob.data, 0) != 0) { - req = smbsrv_init_request(smb_conn); - NT_STATUS_HAVE_NO_MEMORY(req); - - ZERO_STRUCT(req->in); - - req->in.buffer = talloc_steal(req, blob.data); - req->in.size = blob.length; - req->request_time = cur_time; - - smbsrv_reply_special(req); - return NT_STATUS_OK; - } - - if ((NBT_HDR_SIZE + MIN_SMB_SIZE) > blob.length) { - DEBUG(2,("Invalid SMB packet: length %ld\n", (long)blob.length)); - smbsrv_terminate_connection(smb_conn, "Invalid SMB packet"); - return NT_STATUS_OK; - } - - /* Make sure this is an SMB packet */ - if (IVAL(blob.data, NBT_HDR_SIZE) != SMB_MAGIC) { - DEBUG(2,("Non-SMB packet of length %ld. Terminating connection\n", - (long)blob.length)); - smbsrv_terminate_connection(smb_conn, "Non-SMB packet"); - return NT_STATUS_OK; - } - - req = smbsrv_init_request(smb_conn); - NT_STATUS_HAVE_NO_MEMORY(req); - - req->in.buffer = talloc_steal(req, blob.data); - req->in.size = blob.length; - req->request_time = cur_time; - req->chained_fnum = -1; - 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); - } - } - - 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)); - smbsrv_terminate_connection(req->smb_conn, "Invalid SMB packet"); - return NT_STATUS_OK; - } - - 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", - (int)req->in.data_size)); - smbsrv_terminate_connection(req->smb_conn, "Invalid SMB packet"); - return NT_STATUS_OK; - } - - req->flags2 = SVAL(req->in.hdr, HDR_FLG2); - - /* fix the bufinfo */ - smbsrv_setup_bufinfo(req); - - if (!smbsrv_signing_check_incoming(req)) { - smbsrv_send_error(req, NT_STATUS_ACCESS_DENIED); - return NT_STATUS_OK; - } - - command = CVAL(req->in.hdr, HDR_COM); - switch_message(command, req); - return NT_STATUS_OK; -} - /* These flags determine some of the permissions required to do an operation */ #define NEED_SESS (1<<0) #define NEED_TCON (1<<1) #define SIGNING_NO_REPLY (1<<2) +/* does VWV(0) of the request hold chaining information */ +#define AND_X (1<<3) +/* The 64Kb question: are requests > 64K valid? */ +#define LARGE_REQUEST (1<<4) /* define a list of possible SMB messages and their corresponding @@ -180,6 +85,7 @@ static const struct smb_message_struct { const char *name; void (*fn)(struct smbsrv_request *); +#define message_flags(type) smb_messages[(type) & 0xff].flags int flags; } smb_messages[256] = { @@ -219,7 +125,7 @@ static const struct smb_message_struct /* 0x21 */ { NULL, NULL, 0 }, /* 0x22 */ { "SMBsetattrE", smbsrv_reply_setattrE, NEED_SESS|NEED_TCON }, /* 0x23 */ { "SMBgetattrE", smbsrv_reply_getattrE, NEED_SESS|NEED_TCON }, -/* 0x24 */ { "SMBlockingX", smbsrv_reply_lockingX, NEED_SESS|NEED_TCON }, +/* 0x24 */ { "SMBlockingX", smbsrv_reply_lockingX, NEED_SESS|NEED_TCON|AND_X }, /* 0x25 */ { "SMBtrans", smbsrv_reply_trans, NEED_SESS|NEED_TCON }, /* 0x26 */ { "SMBtranss", smbsrv_reply_transs, NEED_SESS|NEED_TCON }, /* 0x27 */ { "SMBioctl", smbsrv_reply_ioctl, NEED_SESS|NEED_TCON }, @@ -228,9 +134,9 @@ static const struct smb_message_struct /* 0x2a */ { "SMBmove", NULL, NEED_SESS|NEED_TCON }, /* 0x2b */ { "SMBecho", smbsrv_reply_echo, 0 }, /* 0x2c */ { "SMBwriteclose", smbsrv_reply_writeclose, NEED_SESS|NEED_TCON }, -/* 0x2d */ { "SMBopenX", smbsrv_reply_open_and_X, NEED_SESS|NEED_TCON }, -/* 0x2e */ { "SMBreadX", smbsrv_reply_read_and_X, NEED_SESS|NEED_TCON }, -/* 0x2f */ { "SMBwriteX", smbsrv_reply_write_and_X, NEED_SESS|NEED_TCON}, +/* 0x2d */ { "SMBopenX", smbsrv_reply_open_and_X, NEED_SESS|NEED_TCON|AND_X }, +/* 0x2e */ { "SMBreadX", smbsrv_reply_read_and_X, NEED_SESS|NEED_TCON|AND_X }, +/* 0x2f */ { "SMBwriteX", smbsrv_reply_write_and_X, NEED_SESS|NEED_TCON|AND_X|LARGE_REQUEST}, /* 0x30 */ { NULL, NULL, 0 }, /* 0x31 */ { NULL, NULL, 0 }, /* 0x32 */ { "SMBtrans2", smbsrv_reply_trans2, NEED_SESS|NEED_TCON }, @@ -298,9 +204,9 @@ static const struct smb_message_struct /* 0x70 */ { "SMBtcon", smbsrv_reply_tcon, NEED_SESS }, /* 0x71 */ { "SMBtdis", smbsrv_reply_tdis, NEED_TCON }, /* 0x72 */ { "SMBnegprot", smbsrv_reply_negprot, 0 }, -/* 0x73 */ { "SMBsesssetupX", smbsrv_reply_sesssetup, 0 }, -/* 0x74 */ { "SMBulogoffX", smbsrv_reply_ulogoffX, NEED_SESS }, /* ulogoff doesn't give a valid TID */ -/* 0x75 */ { "SMBtconX", smbsrv_reply_tcon_and_X, NEED_SESS }, +/* 0x73 */ { "SMBsesssetupX", smbsrv_reply_sesssetup, AND_X }, +/* 0x74 */ { "SMBulogoffX", smbsrv_reply_ulogoffX, NEED_SESS|AND_X }, /* ulogoff doesn't give a valid TID */ +/* 0x75 */ { "SMBtconX", smbsrv_reply_tcon_and_X, NEED_SESS|AND_X }, /* 0x76 */ { NULL, NULL, 0 }, /* 0x77 */ { NULL, NULL, 0 }, /* 0x78 */ { NULL, NULL, 0 }, @@ -343,9 +249,9 @@ static const struct smb_message_struct /* 0x9d */ { NULL, NULL, 0 }, /* 0x9e */ { NULL, NULL, 0 }, /* 0x9f */ { NULL, NULL, 0 }, -/* 0xa0 */ { "SMBnttrans", smbsrv_reply_nttrans, NEED_SESS|NEED_TCON }, +/* 0xa0 */ { "SMBnttrans", smbsrv_reply_nttrans, NEED_SESS|NEED_TCON|LARGE_REQUEST }, /* 0xa1 */ { "SMBnttranss", smbsrv_reply_nttranss, NEED_SESS|NEED_TCON }, -/* 0xa2 */ { "SMBntcreateX", smbsrv_reply_ntcreate_and_X, NEED_SESS|NEED_TCON }, +/* 0xa2 */ { "SMBntcreateX", smbsrv_reply_ntcreate_and_X, NEED_SESS|NEED_TCON|AND_X }, /* 0xa3 */ { NULL, NULL, 0 }, /* 0xa4 */ { "SMBntcancel", smbsrv_reply_ntcancel, NEED_SESS|NEED_TCON|SIGNING_NO_REPLY }, /* 0xa5 */ { "SMBntrename", smbsrv_reply_ntrename, NEED_SESS|NEED_TCON }, @@ -442,6 +348,111 @@ static const struct smb_message_struct }; /**************************************************************************** +receive a SMB request header from the wire, forming a request_context +from the result +****************************************************************************/ +NTSTATUS smbsrv_recv_smb_request(void *private, DATA_BLOB blob) +{ + struct smbsrv_connection *smb_conn = talloc_get_type(private, struct smbsrv_connection); + struct smbsrv_request *req; + struct timeval cur_time = timeval_current(); + uint8_t command; + + smb_conn->statistics.last_request_time = cur_time; + + /* see if its a special NBT packet */ + if (CVAL(blob.data, 0) != 0) { + req = smbsrv_init_request(smb_conn); + NT_STATUS_HAVE_NO_MEMORY(req); + + ZERO_STRUCT(req->in); + + req->in.buffer = talloc_steal(req, blob.data); + req->in.size = blob.length; + req->request_time = cur_time; + + smbsrv_reply_special(req); + return NT_STATUS_OK; + } + + if ((NBT_HDR_SIZE + MIN_SMB_SIZE) > blob.length) { + DEBUG(2,("Invalid SMB packet: length %ld\n", (long)blob.length)); + smbsrv_terminate_connection(smb_conn, "Invalid SMB packet"); + return NT_STATUS_OK; + } + + /* Make sure this is an SMB packet */ + if (IVAL(blob.data, NBT_HDR_SIZE) != SMB_MAGIC) { + DEBUG(2,("Non-SMB packet of length %ld. Terminating connection\n", + (long)blob.length)); + smbsrv_terminate_connection(smb_conn, "Non-SMB packet"); + return NT_STATUS_OK; + } + + req = smbsrv_init_request(smb_conn); + NT_STATUS_HAVE_NO_MEMORY(req); + + req->in.buffer = talloc_steal(req, blob.data); + req->in.size = blob.length; + req->request_time = cur_time; + req->chained_fnum = -1; + 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); + + command = CVAL(req->in.hdr, HDR_COM); + + 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) && + ( message_flags(command) & LARGE_REQUEST) && + ( !(message_flags(command) & AND_X) || + (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); + } + } + + 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)); + smbsrv_terminate_connection(req->smb_conn, "Invalid SMB packet"); + return NT_STATUS_OK; + } + + 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", + (int)req->in.data_size)); + smbsrv_terminate_connection(req->smb_conn, "Invalid SMB packet"); + return NT_STATUS_OK; + } + + req->flags2 = SVAL(req->in.hdr, HDR_FLG2); + + /* fix the bufinfo */ + smbsrv_setup_bufinfo(req); + + if (!smbsrv_signing_check_incoming(req)) { + smbsrv_send_error(req, NT_STATUS_ACCESS_DENIED); + return NT_STATUS_OK; + } + + command = CVAL(req->in.hdr, HDR_COM); + switch_message(command, req); + return NT_STATUS_OK; +} + +/**************************************************************************** return a string containing the function name of a SMB command ****************************************************************************/ static const char *smb_fn_name(uint8_t type) |