[SCM] Samba Shared Repository - branch v4-0-test updated -
release-4-0-0alpha3-251-g8e4f16e
Stefan Metzmacher
metze at samba.org
Fri Apr 18 20:10:14 GMT 2008
The branch, v4-0-test has been updated
via 8e4f16e975e192709f398c98650cbe9fe2a76261 (commit)
via d06eafea1a3e7fa61c94492cf504e6fd81da861d (commit)
from 3c217518ba9a7b64fe6c842187499f1ee5189567 (commit)
http://gitweb.samba.org/?p=samba.git;a=shortlog;h=v4-0-test
- Log -----------------------------------------------------------------
commit 8e4f16e975e192709f398c98650cbe9fe2a76261
Author: Amin Azez <azez at ufomechanic.net>
Date: Mon Mar 10 10:06:12 2008 +0000
Flag smb messages array with AND_X and LARGE_REQUEST
If smb_messages flags show for which opcodes VWV(0)
signifies chaining modes, and also which opcodes can
have requests >64K then the bcc / req->in.data_size
fixup in smbsrv_recv_smb_request can be more safely
applied.
This fix permits nttrans requests >64K to be handled.
It is not yet clear if THAT is a good thing, but this
fix does the current thing more nicely.
commit d06eafea1a3e7fa61c94492cf504e6fd81da861d
Author: Amin Azez <azez at ufomechanic.net>
Date: Mon Mar 10 10:03:38 2008 +0000
Re-order smbsrv_recv_smb_request and smb_messages
No functional change, just re-ordering so that
smbsrv_recv_smb_request can refer to smb_messages
in a future patch
-----------------------------------------------------------------------
Summary of changes:
source/smb_server/smb/receive.c | 227 ++++++++++++++++++++------------------
1 files changed, 119 insertions(+), 108 deletions(-)
Changeset truncated at 500 lines:
diff --git a/source/smb_server/smb/receive.c b/source/smb_server/smb/receive.c
index e3d247c..6cf33cf 100644
--- a/source/smb_server/smb/receive.c
+++ b/source/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)
--
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