Robert Shearman : rpcrt4: Add the correct amount of auth padding to messages.

[Alexandre Julliard]

Module: wine
Branch: refs/heads/master
Commit: 5f266c54a160ec6f8363c23cc6d14843c5adee56
URL:    http://source.winehq.org/git/?p=wine.git;a=commit;h=5f266c54a160ec6f8363c23c...

Author: Robert Shearman 
Date:   Fri May 19 11:03:39 2006 +0100

rpcrt4: Add the correct amount of auth padding to messages.

---

dlls/rpcrt4/rpc_message.c |   29 ++++++++++++++++++++++-------
 1 files changed, 22 insertions(+), 7 deletions(-)

diff --git a/dlls/rpcrt4/rpc_message.c b/dlls/rpcrt4/rpc_message.c
index 3cf993a..6646ce7 100644
--- a/dlls/rpcrt4/rpc_message.c
+++ b/dlls/rpcrt4/rpc_message.c
@@ -42,6 +42,14 @@ #include "rpc_message.h"

WINE_DEFAULT_DEBUG_CHANNEL(rpc);

+/* note: the DCE/RPC spec says the alignment amount should be 4, but
+ * MS/RPC servers seem to always use 16 */
+#define AUTH_ALIGNMENT 16
+
+/* gets the amount needed to round a value up to the specified alignment */
+#define ROUND_UP_AMOUNT(value, alignment) \
+    (((alignment) - (((value) % (alignment)))) % (alignment))
+
 static DWORD RPCRT4_GetHeaderSize(RpcPktHdr *Header)
 {
   static const DWORD header_sizes[] = {
@@ -273,12 +281,19 @@ static RPC_STATUS RPCRT4_SendAuth(RpcCon
   Header->common.flags |= RPC_FLG_FIRST;
   Header->common.flags &= ~RPC_FLG_LAST;
   while (!(Header->common.flags & RPC_FLG_LAST)) {
+    unsigned char auth_pad_len = ROUND_UP_AMOUNT(BufferLength, AUTH_ALIGNMENT);
+    unsigned short pkt_size = BufferLength + hdr_size + alen + auth_pad_len;
+
     /* decide if we need to split the packet into fragments */
-    if ((BufferLength + hdr_size + alen) <= Connection->MaxTransmissionSize) {
-      Header->common.flags |= RPC_FLG_LAST;
-      Header->common.frag_len = BufferLength + hdr_size + alen;
+   if (pkt_size <= Connection->MaxTransmissionSize) {
+     Header->common.flags |= RPC_FLG_LAST;
+     Header->common.frag_len = pkt_size;
     } else {
-      Header->common.frag_len = Connection->MaxTransmissionSize;
+      auth_pad_len = 0;
+      /* make sure packet payload will be a multiple of 16 */
+      Header->common.frag_len =
+        ((Connection->MaxTransmissionSize - hdr_size - alen) & ~(AUTH_ALIGNMENT-1)) +
+        hdr_size + alen;
     }

pkt = HeapAlloc(GetProcessHeap(), HEAP_ZERO_MEMORY, Header->common.frag_len);
@@ -298,7 +313,7 @@ static RPC_STATUS RPCRT4_SendAuth(RpcCon

auth_hdr[0] = Connection->AuthInfo->AuthnSvc;
       auth_hdr[1] = Connection->AuthInfo->AuthnLevel;
-      auth_hdr[2] = 0x00; /* FIXME: add padding */
+      auth_hdr[2] = auth_pad_len;
       auth_hdr[3] = 0x00;

/* a unique number... */
@@ -314,8 +329,8 @@ write:
       return RPC_S_PROTOCOL_ERROR;
     }

-    buffer_pos += Header->common.frag_len - hdr_size - alen;
-    BufferLength -= Header->common.frag_len - hdr_size - alen;
+    buffer_pos += Header->common.frag_len - hdr_size - alen - auth_pad_len;
+    BufferLength -= Header->common.frag_len - hdr_size - alen - auth_pad_len;
     Header->common.flags &= ~RPC_FLG_FIRST;
   }