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More fixes for bug #7146 - Samba miss-parses authenticated RPC packets.

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Alignment space calculations are tricky :-).

Jeremy.
This commit is contained in:
Jeremy Allison 2010-02-18 16:12:04 -08:00
parent 13533e12fd
commit 91a4db6358
1 changed files with 31 additions and 16 deletions
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47
source3/rpc_server/srv_pipe.c
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@ -1,7 +1,7 @@
/*
* Unix SMB/CIFS implementation.
* RPC Pipe client / server routines
* Almost completely rewritten by (C) Jeremy Allison 2005.
* Almost completely rewritten by (C) Jeremy Allison 2005 - 2010
*
* 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
@ -108,15 +108,9 @@ static bool create_next_pdu_ntlmssp(pipes_struct *p)
return False;
}
if (data_len_left % SERVER_NDR_PADDING_SIZE) {
ss_padding_len = SERVER_NDR_PADDING_SIZE - (data_len_left % SERVER_NDR_PADDING_SIZE);
DEBUG(10,("create_next_pdu_ntlmssp: adding sign/seal padding of %u\n",
ss_padding_len ));
}
/* Space available - not including padding. */
data_space_available = RPC_MAX_PDU_FRAG_LEN - RPC_HEADER_LEN -
RPC_HDR_RESP_LEN - ss_padding_len - RPC_HDR_AUTH_LEN -
NTLMSSP_SIG_SIZE;
RPC_HDR_RESP_LEN - RPC_HDR_AUTH_LEN - NTLMSSP_SIG_SIZE;
/*
* The amount we send is the minimum of the available
@ -125,6 +119,19 @@ static bool create_next_pdu_ntlmssp(pipes_struct *p)
data_len = MIN(data_len_left, data_space_available);
/* Work out any padding alignment requirements. */
if ((RPC_HEADER_LEN + RPC_HDR_RESP_LEN + data_len) % SERVER_NDR_PADDING_SIZE) {
ss_padding_len = SERVER_NDR_PADDING_SIZE -
((RPC_HEADER_LEN + RPC_HDR_RESP_LEN + data_len) % SERVER_NDR_PADDING_SIZE);
DEBUG(10,("create_next_pdu_ntlmssp: adding sign/seal padding of %u\n",
ss_padding_len ));
/* If we're over filling the packet, we need to make space
* for the padding at the end of the data. */
if (data_len + ss_padding_len > data_space_available) {
data_len -= SERVER_NDR_PADDING_SIZE;
}
}
/*
* Set up the alloc hint. This should be the data left to
* send.
@ -329,14 +336,9 @@ static bool create_next_pdu_schannel(pipes_struct *p)
return False;
}
if (data_len_left % SERVER_NDR_PADDING_SIZE) {
ss_padding_len = SERVER_NDR_PADDING_SIZE - (data_len_left % SERVER_NDR_PADDING_SIZE);
DEBUG(10,("create_next_pdu_schannel: adding sign/seal padding of %u\n",
ss_padding_len ));
}
/* Space available - not including padding. */
data_space_available = RPC_MAX_PDU_FRAG_LEN - RPC_HEADER_LEN
- RPC_HDR_RESP_LEN - ss_padding_len - RPC_HDR_AUTH_LEN
- RPC_HDR_RESP_LEN - RPC_HDR_AUTH_LEN
- RPC_AUTH_SCHANNEL_SIGN_OR_SEAL_CHK_LEN;
/*
@ -346,6 +348,19 @@ static bool create_next_pdu_schannel(pipes_struct *p)
data_len = MIN(data_len_left, data_space_available);
/* Work out any padding alignment requirements. */
if ((RPC_HEADER_LEN + RPC_HDR_RESP_LEN + data_len) % SERVER_NDR_PADDING_SIZE) {
ss_padding_len = SERVER_NDR_PADDING_SIZE -
((RPC_HEADER_LEN + RPC_HDR_RESP_LEN + data_len) % SERVER_NDR_PADDING_SIZE);
DEBUG(10,("create_next_pdu_schannel: adding sign/seal padding of %u\n",
ss_padding_len ));
/* If we're over filling the packet, we need to make space
* for the padding at the end of the data. */
if (data_len + ss_padding_len > data_space_available) {
data_len -= SERVER_NDR_PADDING_SIZE;
}
}
/*
* Set up the alloc hint. This should be the data left to
* send.