+/*
+ Unix SMB/CIFS implementation.
+ Samba memory buffer functions
+ Copyright (C) Andrew Tridgell 1992-1997
+ Copyright (C) Luke Kenneth Casson Leighton 1996-1997
+ Copyright (C) Jeremy Allison 1999
+ Copyright (C) Andrew Bartlett 2003.
+
+ 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"
+
+#undef DBGC_CLASS
+#define DBGC_CLASS DBGC_RPC_PARSE
+
+/**
+ * Dump a prs to a file: from the current location through to the end.
+ **/
+void prs_dump(char *name, int v, prs_struct *ps)
+{
+ prs_dump_region(name, v, ps, ps->data_offset, ps->buffer_size);
+}
+
+/**
+ * Dump from the start of the prs to the current location.
+ **/
+void prs_dump_before(char *name, int v, prs_struct *ps)
+{
+ prs_dump_region(name, v, ps, 0, ps->data_offset);
+}
+
+/**
+ * Dump everything from the start of the prs up to the current location.
+ **/
+void prs_dump_region(char *name, int v, prs_struct *ps,
+ int from_off, int to_off)
+{
+ int fd, i;
+ pstring fname;
+ ssize_t sz;
+ if (DEBUGLEVEL < 50) return;
+ for (i=1;i<100;i++) {
+ if (v != -1) {
+ slprintf(fname,sizeof(fname)-1, "/tmp/%s_%d.%d.prs", name, v, i);
+ } else {
+ slprintf(fname,sizeof(fname)-1, "/tmp/%s.%d.prs", name, i);
+ }
+ fd = open(fname, O_WRONLY|O_CREAT|O_EXCL, 0644);
+ if (fd != -1 || errno != EEXIST) break;
+ }
+ if (fd != -1) {
+ sz = write(fd, ps->data_p + from_off, to_off - from_off);
+ i = close(fd);
+ if ( (sz != to_off-from_off) || (i != 0) ) {
+ DEBUG(0,("Error writing/closing %s: %ld!=%ld %d\n", fname, (unsigned long)sz, (unsigned long)to_off-from_off, i ));
+ } else {
+ DEBUG(0,("created %s\n", fname));
+ }
+ }
+}
+
+/*******************************************************************
+ Debug output for parsing info
+
+ XXXX side-effect of this function is to increase the debug depth XXXX.
+
+********************************************************************/
+
+void prs_debug(prs_struct *ps, int depth, const char *desc, const char *fn_name)
+{
+ DEBUG(5+depth, ("%s%06x %s %s\n", tab_depth(depth), ps->data_offset, fn_name, desc));
+}
+
+/**
+ * Initialise an expandable parse structure.
+ *
+ * @param size Initial buffer size. If >0, a new buffer will be
+ * created with malloc().
+ *
+ * @return False if allocation fails, otherwise True.
+ **/
+
+BOOL prs_init(prs_struct *ps, uint32 size, TALLOC_CTX *ctx, BOOL io)
+{
+ ZERO_STRUCTP(ps);
+ ps->io = io;
+ ps->bigendian_data = RPC_LITTLE_ENDIAN;
+ ps->align = RPC_PARSE_ALIGN;
+ ps->is_dynamic = False;
+ ps->data_offset = 0;
+ ps->buffer_size = 0;
+ ps->data_p = NULL;
+ ps->mem_ctx = ctx;
+
+ if (size != 0) {
+ ps->buffer_size = size;
+ if((ps->data_p = (char *)SMB_MALLOC((size_t)size)) == NULL) {
+ DEBUG(0,("prs_init: malloc fail for %u bytes.\n", (unsigned int)size));
+ return False;
+ }
+ memset(ps->data_p, '\0', (size_t)size);
+ ps->is_dynamic = True; /* We own this memory. */
+ } else if (MARSHALLING(ps)) {
+ /* If size is zero and we're marshalling we should allocate memory on demand. */
+ ps->is_dynamic = True;
+ }
+
+ return True;
+}
+
+/*******************************************************************
+ Delete the memory in a parse structure - if we own it.
+ ********************************************************************/
+
+void prs_mem_free(prs_struct *ps)
+{
+ if(ps->is_dynamic)
+ SAFE_FREE(ps->data_p);
+ ps->is_dynamic = False;
+ ps->buffer_size = 0;
+ ps->data_offset = 0;
+}
+
+/*******************************************************************
+ Clear the memory in a parse structure.
+ ********************************************************************/
+
+void prs_mem_clear(prs_struct *ps)
+{
+ if (ps->buffer_size)
+ memset(ps->data_p, '\0', (size_t)ps->buffer_size);
+}
+
+/*******************************************************************
+ Allocate memory when unmarshalling... Always zero clears.
+ ********************************************************************/
+
+#if defined(PARANOID_MALLOC_CHECKER)
+char *prs_alloc_mem_(prs_struct *ps, size_t size, unsigned int count)
+#else
+char *prs_alloc_mem(prs_struct *ps, size_t size, unsigned int count)
+#endif
+{
+ char *ret = NULL;
+
+ if (size) {
+ /* We can't call the type-safe version here. */
+ ret = _talloc_zero_array(ps->mem_ctx, size, count, "parse_prs");
+ }
+ return ret;
+}
+
+/*******************************************************************
+ Return the current talloc context we're using.
+ ********************************************************************/
+
+TALLOC_CTX *prs_get_mem_context(prs_struct *ps)
+{
+ return ps->mem_ctx;
+}
+
+/*******************************************************************
+ Hand some already allocated memory to a prs_struct.
+ ********************************************************************/
+
+void prs_give_memory(prs_struct *ps, char *buf, uint32 size, BOOL is_dynamic)
+{
+ ps->is_dynamic = is_dynamic;
+ ps->data_p = buf;
+ ps->buffer_size = size;
+}
+
+/*******************************************************************
+ Take some memory back from a prs_struct.
+ ********************************************************************/
+
+char *prs_take_memory(prs_struct *ps, uint32 *psize)
+{
+ char *ret = ps->data_p;
+ if(psize)
+ *psize = ps->buffer_size;
+ ps->is_dynamic = False;
+ prs_mem_free(ps);
+ return ret;
+}
+
+/*******************************************************************
+ Set a prs_struct to exactly a given size. Will grow or tuncate if neccessary.
+ ********************************************************************/
+
+BOOL prs_set_buffer_size(prs_struct *ps, uint32 newsize)
+{
+ if (newsize > ps->buffer_size)
+ return prs_force_grow(ps, newsize - ps->buffer_size);
+
+ if (newsize < ps->buffer_size) {
+ char *new_data_p = SMB_REALLOC(ps->data_p, newsize);
+ /* if newsize is zero, Realloc acts like free() & returns NULL*/
+ if (new_data_p == NULL && newsize != 0) {
+ DEBUG(0,("prs_set_buffer_size: Realloc failure for size %u.\n",
+ (unsigned int)newsize));
+ DEBUG(0,("prs_set_buffer_size: Reason %s\n",strerror(errno)));
+ return False;
+ }
+ ps->data_p = new_data_p;
+ ps->buffer_size = newsize;
+ }
+
+ return True;
+}
+
+/*******************************************************************
+ Attempt, if needed, to grow a data buffer.
+ Also depends on the data stream mode (io).
+ ********************************************************************/
+
+BOOL prs_grow(prs_struct *ps, uint32 extra_space)
+{
+ uint32 new_size;
+ char *new_data;
+
+ ps->grow_size = MAX(ps->grow_size, ps->data_offset + extra_space);
+
+ if(ps->data_offset + extra_space <= ps->buffer_size)
+ return True;
+
+ /*
+ * We cannot grow the buffer if we're not reading
+ * into the prs_struct, or if we don't own the memory.
+ */
+
+ if(UNMARSHALLING(ps) || !ps->is_dynamic) {
+ DEBUG(0,("prs_grow: Buffer overflow - unable to expand buffer by %u bytes.\n",
+ (unsigned int)extra_space));
+ return False;
+ }
+
+ /*
+ * Decide how much extra space we really need.
+ */
+
+ extra_space -= (ps->buffer_size - ps->data_offset);
+ if(ps->buffer_size == 0) {
+ /*
+ * Ensure we have at least a PDU's length, or extra_space, whichever
+ * is greater.
+ */
+
+ new_size = MAX(RPC_MAX_PDU_FRAG_LEN,extra_space);
+
+ if((new_data = SMB_MALLOC(new_size)) == NULL) {
+ DEBUG(0,("prs_grow: Malloc failure for size %u.\n", (unsigned int)new_size));
+ return False;
+ }
+ memset(new_data, '\0', (size_t)new_size );
+ } else {
+ /*
+ * If the current buffer size is bigger than the space needed, just
+ * double it, else add extra_space.
+ */
+ new_size = MAX(ps->buffer_size*2, ps->buffer_size + extra_space);
+
+ if ((new_data = SMB_REALLOC(ps->data_p, new_size)) == NULL) {
+ DEBUG(0,("prs_grow: Realloc failure for size %u.\n",
+ (unsigned int)new_size));
+ return False;
+ }
+
+ memset(&new_data[ps->buffer_size], '\0', (size_t)(new_size - ps->buffer_size));
+ }
+ ps->buffer_size = new_size;
+ ps->data_p = new_data;
+
+ return True;
+}
+
+/*******************************************************************
+ Attempt to force a data buffer to grow by len bytes.
+ This is only used when appending more data onto a prs_struct
+ when reading an rpc reply, before unmarshalling it.
+ ********************************************************************/
+
+BOOL prs_force_grow(prs_struct *ps, uint32 extra_space)
+{
+ uint32 new_size = ps->buffer_size + extra_space;
+ char *new_data;
+
+ if(!UNMARSHALLING(ps) || !ps->is_dynamic) {
+ DEBUG(0,("prs_force_grow: Buffer overflow - unable to expand buffer by %u bytes.\n",
+ (unsigned int)extra_space));
+ return False;
+ }
+
+ if((new_data = SMB_REALLOC(ps->data_p, new_size)) == NULL) {
+ DEBUG(0,("prs_force_grow: Realloc failure for size %u.\n",
+ (unsigned int)new_size));
+ return False;
+ }
+
+ memset(&new_data[ps->buffer_size], '\0', (size_t)(new_size - ps->buffer_size));
+
+ ps->buffer_size = new_size;
+ ps->data_p = new_data;
+
+ return True;
+}
+
+/*******************************************************************
+ Get the data pointer (external interface).
+********************************************************************/
+
+char *prs_data_p(prs_struct *ps)
+{
+ return ps->data_p;
+}
+
+/*******************************************************************
+ Get the current data size (external interface).
+ ********************************************************************/
+
+uint32 prs_data_size(prs_struct *ps)
+{
+ return ps->buffer_size;
+}
+
+/*******************************************************************
+ Fetch the current offset (external interface).
+ ********************************************************************/
+
+uint32 prs_offset(prs_struct *ps)
+{
+ return ps->data_offset;
+}
+
+/*******************************************************************
+ Set the current offset (external interface).
+ ********************************************************************/
+
+BOOL prs_set_offset(prs_struct *ps, uint32 offset)
+{
+ if(offset <= ps->data_offset) {
+ ps->data_offset = offset;
+ return True;
+ }
+
+ if(!prs_grow(ps, offset - ps->data_offset))
+ return False;
+
+ ps->data_offset = offset;
+ return True;
+}
+
+/*******************************************************************
+ Append the data from one parse_struct into another.
+ ********************************************************************/
+
+BOOL prs_append_prs_data(prs_struct *dst, prs_struct *src)
+{
+ if (prs_offset(src) == 0)
+ return True;
+
+ if(!prs_grow(dst, prs_offset(src)))
+ return False;
+
+ memcpy(&dst->data_p[dst->data_offset], src->data_p, (size_t)prs_offset(src));
+ dst->data_offset += prs_offset(src);
+
+ return True;
+}
+
+/*******************************************************************
+ Append some data from one parse_struct into another.
+ ********************************************************************/
+
+BOOL prs_append_some_prs_data(prs_struct *dst, prs_struct *src, int32 start, uint32 len)
+{
+ if (len == 0)
+ return True;
+
+ if(!prs_grow(dst, len))
+ return False;
+
+ memcpy(&dst->data_p[dst->data_offset], src->data_p + start, (size_t)len);
+ dst->data_offset += len;
+
+ return True;
+}
+
+/*******************************************************************
+ Append the data from a buffer into a parse_struct.
+ ********************************************************************/
+
+BOOL prs_copy_data_in(prs_struct *dst, const char *src, uint32 len)
+{
+ if (len == 0)
+ return True;
+
+ if(!prs_grow(dst, len))
+ return False;
+
+ memcpy(&dst->data_p[dst->data_offset], src, (size_t)len);
+ dst->data_offset += len;
+
+ return True;
+}
+
+/*******************************************************************
+ Copy some data from a parse_struct into a buffer.
+ ********************************************************************/
+
+BOOL prs_copy_data_out(char *dst, prs_struct *src, uint32 len)
+{
+ if (len == 0)
+ return True;
+
+ if(!prs_mem_get(src, len))
+ return False;
+
+ memcpy(dst, &src->data_p[src->data_offset], (size_t)len);
+ src->data_offset += len;
+
+ return True;
+}
+
+/*******************************************************************
+ Copy all the data from a parse_struct into a buffer.
+ ********************************************************************/
+
+BOOL prs_copy_all_data_out(char *dst, prs_struct *src)
+{
+ uint32 len = prs_offset(src);
+
+ if (!len)
+ return True;
+
+ prs_set_offset(src, 0);
+ return prs_copy_data_out(dst, src, len);
+}
+
+/*******************************************************************
+ Set the data as X-endian (external interface).
+ ********************************************************************/
+
+void prs_set_endian_data(prs_struct *ps, BOOL endian)
+{
+ ps->bigendian_data = endian;
+}
+
+/*******************************************************************
+ Align a the data_len to a multiple of align bytes - filling with
+ zeros.
+ ********************************************************************/
+
+BOOL prs_align(prs_struct *ps)
+{
+ uint32 mod = ps->data_offset & (ps->align-1);
+
+ if (ps->align != 0 && mod != 0) {
+ uint32 extra_space = (ps->align - mod);
+ if(!prs_grow(ps, extra_space))
+ return False;
+ memset(&ps->data_p[ps->data_offset], '\0', (size_t)extra_space);
+ ps->data_offset += extra_space;
+ }
+
+ return True;
+}
+
+/******************************************************************
+ Align on a 2 byte boundary
+ *****************************************************************/
+
+BOOL prs_align_uint16(prs_struct *ps)
+{
+ BOOL ret;
+ uint8 old_align = ps->align;
+
+ ps->align = 2;
+ ret = prs_align(ps);
+ ps->align = old_align;
+
+ return ret;
+}
+
+/******************************************************************
+ Align on a 8 byte boundary
+ *****************************************************************/
+
+BOOL prs_align_uint64(prs_struct *ps)
+{
+ BOOL ret;
+ uint8 old_align = ps->align;
+
+ ps->align = 8;
+ ret = prs_align(ps);
+ ps->align = old_align;
+
+ return ret;
+}
+
+/******************************************************************
+ Align on a specific byte boundary
+ *****************************************************************/
+
+BOOL prs_align_custom(prs_struct *ps, uint8 boundary)
+{
+ BOOL ret;
+ uint8 old_align = ps->align;
+
+ ps->align = boundary;
+ ret = prs_align(ps);
+ ps->align = old_align;
+
+ return ret;
+}
+
+
+
+/*******************************************************************
+ Align only if required (for the unistr2 string mainly)
+ ********************************************************************/
+
+BOOL prs_align_needed(prs_struct *ps, uint32 needed)
+{
+ if (needed==0)
+ return True;
+ else
+ return prs_align(ps);
+}
+
+/*******************************************************************
+ Ensure we can read/write to a given offset.
+ ********************************************************************/
+
+char *prs_mem_get(prs_struct *ps, uint32 extra_size)
+{
+ if(UNMARSHALLING(ps)) {
+ /*
+ * If reading, ensure that we can read the requested size item.
+ */
+ if (ps->data_offset + extra_size > ps->buffer_size) {
+ DEBUG(0,("prs_mem_get: reading data of size %u would overrun "
+ "buffer by %u bytes.\n",
+ (unsigned int)extra_size,
+ (unsigned int)(ps->data_offset + extra_size - ps->buffer_size) ));
+ return NULL;
+ }
+ } else {
+ /*
+ * Writing - grow the buffer if needed.
+ */
+ if(!prs_grow(ps, extra_size))
+ return NULL;
+ }
+ return &ps->data_p[ps->data_offset];
+}
+
+/*******************************************************************
+ Change the struct type.
+ ********************************************************************/
+
+void prs_switch_type(prs_struct *ps, BOOL io)
+{
+ if ((ps->io ^ io) == True)
+ ps->io=io;
+}
+
+/*******************************************************************
+ Force a prs_struct to be dynamic even when it's size is 0.
+ ********************************************************************/
+
+void prs_force_dynamic(prs_struct *ps)
+{
+ ps->is_dynamic=True;
+}
+
+/*******************************************************************
+ Associate a session key with a parse struct.
+ ********************************************************************/
+
+void prs_set_session_key(prs_struct *ps, const char sess_key[16])
+{
+ ps->sess_key = sess_key;
+}
+
+/*******************************************************************
+ Stream a uint8.
+ ********************************************************************/
+
+BOOL prs_uint8(const char *name, prs_struct *ps, int depth, uint8 *data8)
+{
+ char *q = prs_mem_get(ps, 1);
+ if (q == NULL)
+ return False;
+
+ if (UNMARSHALLING(ps))
+ *data8 = CVAL(q,0);
+ else
+ SCVAL(q,0,*data8);
+
+ DEBUG(5,("%s%04x %s: %02x\n", tab_depth(depth), ps->data_offset, name, *data8));
+
+ ps->data_offset += 1;
+
+ return True;
+}
+
+/*******************************************************************
+ Stream a uint16* (allocate memory if unmarshalling)
+ ********************************************************************/
+
+BOOL prs_pointer( const char *name, prs_struct *ps, int depth,
+ void **data, size_t data_size,
+ BOOL(*prs_fn)(const char*, prs_struct*, int, void*) )
+{
+ uint32 data_p;
+
+ /* output f000baaa to stream if the pointer is non-zero. */
+
+ data_p = *data ? 0xf000baaa : 0;
+
+ if ( !prs_uint32("ptr", ps, depth, &data_p ))
+ return False;
+
+ /* we're done if there is no data */
+
+ if ( !data_p )
+ return True;
+
+ if (UNMARSHALLING(ps)) {
+ if ( !(*data = PRS_ALLOC_MEM_VOID(ps, data_size)) )
+ return False;
+ }
+
+ return prs_fn(name, ps, depth, *data);
+}
+
+
+/*******************************************************************
+ Stream a uint16.
+ ********************************************************************/
+
+BOOL prs_uint16(const char *name, prs_struct *ps, int depth, uint16 *data16)
+{
+ char *q = prs_mem_get(ps, sizeof(uint16));
+ if (q == NULL)
+ return False;
+
+ if (UNMARSHALLING(ps)) {
+ if (ps->bigendian_data)
+ *data16 = RSVAL(q,0);
+ else
+ *data16 = SVAL(q,0);
+ } else {
+ if (ps->bigendian_data)
+ RSSVAL(q,0,*data16);
+ else
+ SSVAL(q,0,*data16);
+ }
+
+ DEBUG(5,("%s%04x %s: %04x\n", tab_depth(depth), ps->data_offset, name, *data16));
+
+ ps->data_offset += sizeof(uint16);
+
+ return True;
+}
+
+/*******************************************************************
+ Stream a uint32.
+ ********************************************************************/
+
+BOOL prs_uint32(const char *name, prs_struct *ps, int depth, uint32 *data32)
+{
+ char *q = prs_mem_get(ps, sizeof(uint32));
+ if (q == NULL)
+ return False;
+
+ if (UNMARSHALLING(ps)) {
+ if (ps->bigendian_data)
+ *data32 = RIVAL(q,0);
+ else
+ *data32 = IVAL(q,0);
+ } else {
+ if (ps->bigendian_data)
+ RSIVAL(q,0,*data32);
+ else
+ SIVAL(q,0,*data32);
+ }
+
+ DEBUG(5,("%s%04x %s: %08x\n", tab_depth(depth), ps->data_offset, name, *data32));
+
+ ps->data_offset += sizeof(uint32);
+
+ return True;
+}
+
+/*******************************************************************
+ Stream an int32.
+ ********************************************************************/
+
+BOOL prs_int32(const char *name, prs_struct *ps, int depth, int32 *data32)
+{
+ char *q = prs_mem_get(ps, sizeof(int32));
+ if (q == NULL)
+ return False;
+
+ if (UNMARSHALLING(ps)) {
+ if (ps->bigendian_data)
+ *data32 = RIVALS(q,0);
+ else
+ *data32 = IVALS(q,0);
+ } else {
+ if (ps->bigendian_data)
+ RSIVALS(q,0,*data32);
+ else
+ SIVALS(q,0,*data32);
+ }
+
+ DEBUG(5,("%s%04x %s: %08x\n", tab_depth(depth), ps->data_offset, name, *data32));
+
+ ps->data_offset += sizeof(int32);
+
+ return True;
+}
+
+/*******************************************************************
+ Stream a NTSTATUS
+ ********************************************************************/
+
+BOOL prs_ntstatus(const char *name, prs_struct *ps, int depth, NTSTATUS *status)
+{
+ char *q = prs_mem_get(ps, sizeof(uint32));
+ if (q == NULL)
+ return False;
+
+ if (UNMARSHALLING(ps)) {
+ if (ps->bigendian_data)
+ *status = NT_STATUS(RIVAL(q,0));
+ else
+ *status = NT_STATUS(IVAL(q,0));
+ } else {
+ if (ps->bigendian_data)
+ RSIVAL(q,0,NT_STATUS_V(*status));
+ else
+ SIVAL(q,0,NT_STATUS_V(*status));
+ }
+
+ DEBUG(5,("%s%04x %s: %s\n", tab_depth(depth), ps->data_offset, name,
+ nt_errstr(*status)));
+
+ ps->data_offset += sizeof(uint32);
+
+ return True;
+}
+
+/*******************************************************************
+ Stream a WERROR
+ ********************************************************************/
+
+BOOL prs_werror(const char *name, prs_struct *ps, int depth, WERROR *status)
+{
+ char *q = prs_mem_get(ps, sizeof(uint32));
+ if (q == NULL)
+ return False;
+
+ if (UNMARSHALLING(ps)) {
+ if (ps->bigendian_data)
+ *status = W_ERROR(RIVAL(q,0));
+ else
+ *status = W_ERROR(IVAL(q,0));
+ } else {
+ if (ps->bigendian_data)
+ RSIVAL(q,0,W_ERROR_V(*status));
+ else
+ SIVAL(q,0,W_ERROR_V(*status));
+ }
+
+ DEBUG(5,("%s%04x %s: %s\n", tab_depth(depth), ps->data_offset, name,
+ dos_errstr(*status)));
+
+ ps->data_offset += sizeof(uint32);
+
+ return True;
+}
+
+
+/******************************************************************
+ Stream an array of uint8s. Length is number of uint8s.
+ ********************************************************************/
+
+BOOL prs_uint8s(BOOL charmode, const char *name, prs_struct *ps, int depth, uint8 *data8s, int len)
+{
+ int i;
+ char *q = prs_mem_get(ps, len);
+ if (q == NULL)
+ return False;
+
+ if (UNMARSHALLING(ps)) {
+ for (i = 0; i < len; i++)
+ data8s[i] = CVAL(q,i);
+ } else {
+ for (i = 0; i < len; i++)
+ SCVAL(q, i, data8s[i]);
+ }
+
+ DEBUG(5,("%s%04x %s: ", tab_depth(depth), ps->data_offset ,name));
+ if (charmode)
+ print_asc(5, (unsigned char*)data8s, len);
+ else {
+ for (i = 0; i < len; i++)
+ DEBUG(5,("%02x ", data8s[i]));
+ }
+ DEBUG(5,("\n"));
+
+ ps->data_offset += len;
+
+ return True;
+}
+
+/******************************************************************
+ Stream an array of uint16s. Length is number of uint16s.
+ ********************************************************************/
+
+BOOL prs_uint16s(BOOL charmode, const char *name, prs_struct *ps, int depth, uint16 *data16s, int len)
+{
+ int i;
+ char *q = prs_mem_get(ps, len * sizeof(uint16));
+ if (q == NULL)
+ return False;
+
+ if (UNMARSHALLING(ps)) {
+ if (ps->bigendian_data) {
+ for (i = 0; i < len; i++)
+ data16s[i] = RSVAL(q, 2*i);
+ } else {
+ for (i = 0; i < len; i++)
+ data16s[i] = SVAL(q, 2*i);
+ }
+ } else {
+ if (ps->bigendian_data) {
+ for (i = 0; i < len; i++)
+ RSSVAL(q, 2*i, data16s[i]);
+ } else {
+ for (i = 0; i < len; i++)
+ SSVAL(q, 2*i, data16s[i]);
+ }
+ }
+
+ DEBUG(5,("%s%04x %s: ", tab_depth(depth), ps->data_offset, name));
+ if (charmode)
+ print_asc(5, (unsigned char*)data16s, 2*len);
+ else {
+ for (i = 0; i < len; i++)
+ DEBUG(5,("%04x ", data16s[i]));
+ }
+ DEBUG(5,("\n"));
+
+ ps->data_offset += (len * sizeof(uint16));
+
+ return True;
+}
+
+/******************************************************************
+ Start using a function for streaming unicode chars. If unmarshalling,
+ output must be little-endian, if marshalling, input must be little-endian.
+ ********************************************************************/
+
+static void dbg_rw_punival(BOOL charmode, const char *name, int depth, prs_struct *ps,
+ char *in_buf, char *out_buf, int len)
+{
+ int i;
+
+ if (UNMARSHALLING(ps)) {
+ if (ps->bigendian_data) {
+ for (i = 0; i < len; i++)
+ SSVAL(out_buf,2*i,RSVAL(in_buf, 2*i));
+ } else {
+ for (i = 0; i < len; i++)
+ SSVAL(out_buf, 2*i, SVAL(in_buf, 2*i));
+ }
+ } else {
+ if (ps->bigendian_data) {
+ for (i = 0; i < len; i++)
+ RSSVAL(in_buf, 2*i, SVAL(out_buf,2*i));
+ } else {
+ for (i = 0; i < len; i++)
+ SSVAL(in_buf, 2*i, SVAL(out_buf,2*i));
+ }
+ }
+
+ DEBUG(5,("%s%04x %s: ", tab_depth(depth), ps->data_offset, name));
+ if (charmode)
+ print_asc(5, (unsigned char*)out_buf, 2*len);
+ else {
+ for (i = 0; i < len; i++)
+ DEBUG(5,("%04x ", out_buf[i]));
+ }
+ DEBUG(5,("\n"));
+}
+
+/******************************************************************
+ Stream a unistr. Always little endian.
+ ********************************************************************/
+
+BOOL prs_uint16uni(BOOL charmode, const char *name, prs_struct *ps, int depth, uint16 *data16s, int len)
+{
+ char *q = prs_mem_get(ps, len * sizeof(uint16));
+ if (q == NULL)
+ return False;
+
+ dbg_rw_punival(charmode, name, depth, ps, q, (char *)data16s, len);
+ ps->data_offset += (len * sizeof(uint16));
+
+ return True;
+}
+
+/******************************************************************
+ Stream an array of uint32s. Length is number of uint32s.
+ ********************************************************************/
+
+BOOL prs_uint32s(BOOL charmode, const char *name, prs_struct *ps, int depth, uint32 *data32s, int len)
+{
+ int i;
+ char *q = prs_mem_get(ps, len * sizeof(uint32));
+ if (q == NULL)
+ return False;
+
+ if (UNMARSHALLING(ps)) {
+ if (ps->bigendian_data) {
+ for (i = 0; i < len; i++)
+ data32s[i] = RIVAL(q, 4*i);
+ } else {
+ for (i = 0; i < len; i++)
+ data32s[i] = IVAL(q, 4*i);
+ }
+ } else {
+ if (ps->bigendian_data) {
+ for (i = 0; i < len; i++)
+ RSIVAL(q, 4*i, data32s[i]);
+ } else {
+ for (i = 0; i < len; i++)
+ SIVAL(q, 4*i, data32s[i]);
+ }
+ }
+
+ DEBUG(5,("%s%04x %s: ", tab_depth(depth), ps->data_offset, name));
+ if (charmode)
+ print_asc(5, (unsigned char*)data32s, 4*len);
+ else {
+ for (i = 0; i < len; i++)
+ DEBUG(5,("%08x ", data32s[i]));
+ }
+ DEBUG(5,("\n"));
+
+ ps->data_offset += (len * sizeof(uint32));
+
+ return True;
+}
+
+/******************************************************************
+ Stream an array of unicode string, length/buffer specified separately,
+ in uint16 chars. The unicode string is already in little-endian format.
+ ********************************************************************/
+
+BOOL prs_buffer5(BOOL charmode, const char *name, prs_struct *ps, int depth, BUFFER5 *str)
+{
+ char *p;
+ char *q = prs_mem_get(ps, str->buf_len * sizeof(uint16));
+ if (q == NULL)
+ return False;
+
+ if (UNMARSHALLING(ps)) {
+ str->buffer = PRS_ALLOC_MEM(ps,uint16,str->buf_len);
+ if (str->buffer == NULL)
+ return False;
+ }
+
+ /* If the string is empty, we don't have anything to stream */
+ if (str->buf_len==0)
+ return True;
+
+ p = (char *)str->buffer;
+
+ dbg_rw_punival(charmode, name, depth, ps, q, p, str->buf_len);
+
+ ps->data_offset += (str->buf_len * sizeof(uint16));
+
+ return True;
+}
+
+/******************************************************************
+ Stream a "not" unicode string, length/buffer specified separately,
+ in byte chars. String is in little-endian format.
+ ********************************************************************/
+
+BOOL prs_regval_buffer(BOOL charmode, const char *name, prs_struct *ps, int depth, REGVAL_BUFFER *buf)
+{
+ char *p;
+ char *q = prs_mem_get(ps, buf->buf_len);
+ if (q == NULL)
+ return False;
+
+ if (UNMARSHALLING(ps)) {
+ if (buf->buf_len > buf->buf_max_len) {
+ return False;
+ }
+ if ( buf->buf_max_len ) {
+ buf->buffer = PRS_ALLOC_MEM(ps, uint16, buf->buf_max_len);
+ if ( buf->buffer == NULL )
+ return False;
+ }
+ }
+
+ p = (char *)buf->buffer;
+
+ dbg_rw_punival(charmode, name, depth, ps, q, p, buf->buf_len/2);
+ ps->data_offset += buf->buf_len;
+
+ return True;
+}
+
+/******************************************************************
+ Stream a string, length/buffer specified separately,
+ in uint8 chars.
+ ********************************************************************/
+
+BOOL prs_string2(BOOL charmode, const char *name, prs_struct *ps, int depth, STRING2 *str)
+{
+ unsigned int i;
+ char *q = prs_mem_get(ps, str->str_str_len);
+ if (q == NULL)
+ return False;
+
+ if (UNMARSHALLING(ps)) {
+ if (str->str_str_len > str->str_max_len) {
+ return False;
+ }
+ str->buffer = PRS_ALLOC_MEM(ps,unsigned char, str->str_max_len);
+ if (str->buffer == NULL)
+ return False;
+ }
+
+ if (UNMARSHALLING(ps)) {
+ for (i = 0; i < str->str_str_len; i++)
+ str->buffer[i] = CVAL(q,i);
+ } else {
+ for (i = 0; i < str->str_str_len; i++)
+ SCVAL(q, i, str->buffer[i]);
+ }
+
+ DEBUG(5,("%s%04x %s: ", tab_depth(depth), ps->data_offset, name));
+ if (charmode)
+ print_asc(5, (unsigned char*)str->buffer, str->str_str_len);
+ else {
+ for (i = 0; i < str->str_str_len; i++)
+ DEBUG(5,("%02x ", str->buffer[i]));
+ }
+ DEBUG(5,("\n"));
+
+ ps->data_offset += str->str_str_len;
+
+ return True;
+}
+
+/******************************************************************
+ Stream a unicode string, length/buffer specified separately,
+ in uint16 chars. The unicode string is already in little-endian format.
+ ********************************************************************/
+
+BOOL prs_unistr2(BOOL charmode, const char *name, prs_struct *ps, int depth, UNISTR2 *str)
+{
+ char *p;
+ char *q = prs_mem_get(ps, str->uni_str_len * sizeof(uint16));
+ if (q == NULL)
+ return False;
+
+ /* If the string is empty, we don't have anything to stream */
+ if (str->uni_str_len==0)
+ return True;
+
+ if (UNMARSHALLING(ps)) {
+ if (str->uni_str_len > str->uni_max_len) {
+ return False;
+ }
+ str->buffer = PRS_ALLOC_MEM(ps,uint16,str->uni_max_len);
+ if (str->buffer == NULL)
+ return False;
+ }
+
+ p = (char *)str->buffer;
+
+ dbg_rw_punival(charmode, name, depth, ps, q, p, str->uni_str_len);
+
+ ps->data_offset += (str->uni_str_len * sizeof(uint16));
+
+ return True;
+}
+
+/******************************************************************
+ Stream a unicode string, length/buffer specified separately,
+ in uint16 chars. The unicode string is already in little-endian format.
+ ********************************************************************/
+
+BOOL prs_unistr3(BOOL charmode, const char *name, UNISTR3 *str, prs_struct *ps, int depth)
+{
+ char *p;
+ char *q = prs_mem_get(ps, str->uni_str_len * sizeof(uint16));
+ if (q == NULL)
+ return False;
+
+ if (UNMARSHALLING(ps)) {
+ str->str.buffer = PRS_ALLOC_MEM(ps,uint16,str->uni_str_len);
+ if (str->str.buffer == NULL)
+ return False;
+ }
+
+ p = (char *)str->str.buffer;
+
+ dbg_rw_punival(charmode, name, depth, ps, q, p, str->uni_str_len);
+ ps->data_offset += (str->uni_str_len * sizeof(uint16));
+
+ return True;
+}
+
+/*******************************************************************
+ Stream a unicode null-terminated string. As the string is already
+ in little-endian format then do it as a stream of bytes.
+ ********************************************************************/
+
+BOOL prs_unistr(const char *name, prs_struct *ps, int depth, UNISTR *str)
+{
+ unsigned int len = 0;
+ unsigned char *p = (unsigned char *)str->buffer;
+ uint8 *start;
+ char *q;
+ uint32 max_len;
+ uint16* ptr;
+
+ if (MARSHALLING(ps)) {
+
+ for(len = 0; str->buffer[len] != 0; len++)
+ ;
+
+ q = prs_mem_get(ps, (len+1)*2);
+ if (q == NULL)
+ return False;
+
+ start = (uint8*)q;
+
+ for(len = 0; str->buffer[len] != 0; len++) {
+ if(ps->bigendian_data) {
+ /* swap bytes - p is little endian, q is big endian. */
+ q[0] = (char)p[1];
+ q[1] = (char)p[0];
+ p += 2;
+ q += 2;
+ }
+ else
+ {
+ q[0] = (char)p[0];
+ q[1] = (char)p[1];
+ p += 2;
+ q += 2;
+ }
+ }
+
+ /*
+ * even if the string is 'empty' (only an \0 char)
+ * at this point the leading \0 hasn't been parsed.
+ * so parse it now
+ */
+
+ q[0] = 0;
+ q[1] = 0;
+ q += 2;
+
+ len++;
+
+ DEBUG(5,("%s%04x %s: ", tab_depth(depth), ps->data_offset, name));
+ print_asc(5, (unsigned char*)start, 2*len);
+ DEBUG(5, ("\n"));
+ }
+ else { /* unmarshalling */
+
+ uint32 alloc_len = 0;
+ q = ps->data_p + prs_offset(ps);
+
+ /*
+ * Work out how much space we need and talloc it.
+ */
+ max_len = (ps->buffer_size - ps->data_offset)/sizeof(uint16);
+
+ /* the test of the value of *ptr helps to catch the circumstance
+ where we have an emtpty (non-existent) string in the buffer */
+ for ( ptr = (uint16 *)q; *ptr++ && (alloc_len <= max_len); alloc_len++)
+ /* do nothing */
+ ;
+
+ if (alloc_len < max_len)
+ alloc_len += 1;
+
+ /* should we allocate anything at all? */
+ str->buffer = PRS_ALLOC_MEM(ps,uint16,alloc_len);
+ if ((str->buffer == NULL) && (alloc_len > 0))
+ return False;
+
+ p = (unsigned char *)str->buffer;
+
+ len = 0;
+ /* the (len < alloc_len) test is to prevent us from overwriting
+ memory that is not ours...if we get that far, we have a non-null
+ terminated string in the buffer and have messed up somewhere */
+ while ((len < alloc_len) && (*(uint16 *)q != 0)) {
+ if(ps->bigendian_data)
+ {
+ /* swap bytes - q is big endian, p is little endian. */
+ p[0] = (unsigned char)q[1];
+ p[1] = (unsigned char)q[0];
+ p += 2;
+ q += 2;
+ } else {
+
+ p[0] = (unsigned char)q[0];
+ p[1] = (unsigned char)q[1];
+ p += 2;
+ q += 2;
+ }
+
+ len++;
+ }
+ if (len < alloc_len) {
+ /* NULL terminate the UNISTR */
+ str->buffer[len++] = '\0';
+ }
+
+ DEBUG(5,("%s%04x %s: ", tab_depth(depth), ps->data_offset, name));
+ print_asc(5, (unsigned char*)str->buffer, 2*len);
+ DEBUG(5, ("\n"));
+ }
+
+ /* set the offset in the prs_struct; 'len' points to the
+ terminiating NULL in the UNISTR so we need to go one more
+ uint16 */
+ ps->data_offset += (len)*2;
+
+ return True;
+}
+
+
+/*******************************************************************
+ Stream a null-terminated string. len is strlen, and therefore does
+ not include the null-termination character.
+ ********************************************************************/
+
+BOOL prs_string(const char *name, prs_struct *ps, int depth, char *str, int max_buf_size)
+{
+ char *q;
+ int i;
+ int len;
+
+ if (UNMARSHALLING(ps))
+ len = strlen(&ps->data_p[ps->data_offset]);
+ else
+ len = strlen(str);
+
+ len = MIN(len, (max_buf_size-1));
+
+ q = prs_mem_get(ps, len+1);
+ if (q == NULL)
+ return False;
+
+ for(i = 0; i < len; i++) {
+ if (UNMARSHALLING(ps))
+ str[i] = q[i];
+ else
+ q[i] = str[i];
+ }
+
+ /* The terminating null. */
+ str[i] = '\0';
+
+ if (MARSHALLING(ps)) {
+ q[i] = '\0';
+ }
+
+ ps->data_offset += len+1;
+
+ dump_data(5+depth, q, len);
+
+ return True;
+}
+
+/*******************************************************************
+ prs_uint16 wrapper. Call this and it sets up a pointer to where the
+ uint16 should be stored, or gets the size if reading.
+ ********************************************************************/
+
+BOOL prs_uint16_pre(const char *name, prs_struct *ps, int depth, uint16 *data16, uint32 *offset)
+{
+ *offset = ps->data_offset;
+ if (UNMARSHALLING(ps)) {
+ /* reading. */
+ return prs_uint16(name, ps, depth, data16);
+ } else {
+ char *q = prs_mem_get(ps, sizeof(uint16));
+ if(q ==NULL)
+ return False;
+ ps->data_offset += sizeof(uint16);
+ }
+ return True;
+}
+
+/*******************************************************************
+ prs_uint16 wrapper. call this and it retrospectively stores the size.
+ does nothing on reading, as that is already handled by ...._pre()
+ ********************************************************************/
+
+BOOL prs_uint16_post(const char *name, prs_struct *ps, int depth, uint16 *data16,
+ uint32 ptr_uint16, uint32 start_offset)
+{
+ if (MARSHALLING(ps)) {
+ /*
+ * Writing - temporarily move the offset pointer.
+ */
+ uint16 data_size = ps->data_offset - start_offset;
+ uint32 old_offset = ps->data_offset;
+
+ ps->data_offset = ptr_uint16;
+ if(!prs_uint16(name, ps, depth, &data_size)) {
+ ps->data_offset = old_offset;
+ return False;
+ }
+ ps->data_offset = old_offset;
+ } else {
+ ps->data_offset = start_offset + (uint32)(*data16);
+ }
+ return True;
+}
+
+/*******************************************************************
+ prs_uint32 wrapper. Call this and it sets up a pointer to where the
+ uint32 should be stored, or gets the size if reading.
+ ********************************************************************/
+
+BOOL prs_uint32_pre(const char *name, prs_struct *ps, int depth, uint32 *data32, uint32 *offset)
+{
+ *offset = ps->data_offset;
+ if (UNMARSHALLING(ps) && (data32 != NULL)) {
+ /* reading. */
+ return prs_uint32(name, ps, depth, data32);
+ } else {
+ ps->data_offset += sizeof(uint32);
+ }
+ return True;
+}
+
+/*******************************************************************
+ prs_uint32 wrapper. call this and it retrospectively stores the size.
+ does nothing on reading, as that is already handled by ...._pre()
+ ********************************************************************/
+
+BOOL prs_uint32_post(const char *name, prs_struct *ps, int depth, uint32 *data32,
+ uint32 ptr_uint32, uint32 data_size)
+{
+ if (MARSHALLING(ps)) {
+ /*
+ * Writing - temporarily move the offset pointer.
+ */
+ uint32 old_offset = ps->data_offset;
+ ps->data_offset = ptr_uint32;
+ if(!prs_uint32(name, ps, depth, &data_size)) {
+ ps->data_offset = old_offset;
+ return False;
+ }
+ ps->data_offset = old_offset;
+ }
+ return True;
+}
+
+/* useful function to store a structure in rpc wire format */
+int tdb_prs_store(TDB_CONTEXT *tdb, char *keystr, prs_struct *ps)
+{
+ TDB_DATA kbuf, dbuf;
+ kbuf.dptr = keystr;
+ kbuf.dsize = strlen(keystr)+1;
+ dbuf.dptr = ps->data_p;
+ dbuf.dsize = prs_offset(ps);
+ return tdb_store(tdb, kbuf, dbuf, TDB_REPLACE);
+}
+
+/* useful function to fetch a structure into rpc wire format */
+int tdb_prs_fetch(TDB_CONTEXT *tdb, char *keystr, prs_struct *ps, TALLOC_CTX *mem_ctx)
+{
+ TDB_DATA kbuf, dbuf;
+ kbuf.dptr = keystr;
+ kbuf.dsize = strlen(keystr)+1;
+
+ dbuf = tdb_fetch(tdb, kbuf);
+ if (!dbuf.dptr)
+ return -1;
+
+ prs_init(ps, 0, mem_ctx, UNMARSHALL);
+ prs_give_memory(ps, dbuf.dptr, dbuf.dsize, True);
+
+ return 0;
+}
+
+/*******************************************************************
+ hash a stream.
+ ********************************************************************/
+
+BOOL prs_hash1(prs_struct *ps, uint32 offset, int len)
+{
+ char *q;
+
+ q = ps->data_p;
+ q = &q[offset];
+
+#ifdef DEBUG_PASSWORD
+ DEBUG(100, ("prs_hash1\n"));
+ dump_data(100, ps->sess_key, 16);
+ dump_data(100, q, len);
+#endif
+ SamOEMhash((uchar *) q, (const unsigned char *)ps->sess_key, len);
+
+#ifdef DEBUG_PASSWORD
+ dump_data(100, q, len);
+#endif
+
+ return True;
+}
+
+/*******************************************************************
+ Create a digest over the entire packet (including the data), and
+ MD5 it with the session key.
+ ********************************************************************/
+
+static void schannel_digest(struct schannel_auth_struct *a,
+ enum pipe_auth_level auth_level,
+ RPC_AUTH_SCHANNEL_CHK * verf,
+ char *data, size_t data_len,
+ uchar digest_final[16])
+{
+ uchar whole_packet_digest[16];
+ static uchar zeros[4];
+ struct MD5Context ctx3;
+
+ /* verfiy the signature on the packet by MD5 over various bits */
+ MD5Init(&ctx3);
+ /* use our sequence number, which ensures the packet is not
+ out of order */
+ MD5Update(&ctx3, zeros, sizeof(zeros));
+ MD5Update(&ctx3, verf->sig, sizeof(verf->sig));
+ if (auth_level == PIPE_AUTH_LEVEL_PRIVACY) {
+ MD5Update(&ctx3, verf->confounder, sizeof(verf->confounder));
+ }
+ MD5Update(&ctx3, (const unsigned char *)data, data_len);
+ MD5Final(whole_packet_digest, &ctx3);
+ dump_data_pw("whole_packet_digest:\n", whole_packet_digest, sizeof(whole_packet_digest));
+
+ /* MD5 this result and the session key, to prove that
+ only a valid client could had produced this */
+ hmac_md5(a->sess_key, whole_packet_digest, sizeof(whole_packet_digest), digest_final);
+}
+
+/*******************************************************************
+ Calculate the key with which to encode the data payload
+ ********************************************************************/
+
+static void schannel_get_sealing_key(struct schannel_auth_struct *a,
+ RPC_AUTH_SCHANNEL_CHK *verf,
+ uchar sealing_key[16])
+{
+ static uchar zeros[4];
+ uchar digest2[16];
+ uchar sess_kf0[16];
+ int i;
+
+ for (i = 0; i < sizeof(sess_kf0); i++) {
+ sess_kf0[i] = a->sess_key[i] ^ 0xf0;
+ }
+
+ dump_data_pw("sess_kf0:\n", sess_kf0, sizeof(sess_kf0));
+
+ /* MD5 of sess_kf0 and 4 zero bytes */
+ hmac_md5(sess_kf0, zeros, 0x4, digest2);
+ dump_data_pw("digest2:\n", digest2, sizeof(digest2));
+
+ /* MD5 of the above result, plus 8 bytes of sequence number */
+ hmac_md5(digest2, verf->seq_num, sizeof(verf->seq_num), sealing_key);
+ dump_data_pw("sealing_key:\n", sealing_key, 16);
+}
+
+/*******************************************************************
+ Encode or Decode the sequence number (which is symmetric)
+ ********************************************************************/
+
+static void schannel_deal_with_seq_num(struct schannel_auth_struct *a,
+ RPC_AUTH_SCHANNEL_CHK *verf)
+{
+ static uchar zeros[4];
+ uchar sequence_key[16];
+ uchar digest1[16];
+
+ hmac_md5(a->sess_key, zeros, sizeof(zeros), digest1);
+ dump_data_pw("(sequence key) digest1:\n", digest1, sizeof(digest1));
+
+ hmac_md5(digest1, verf->packet_digest, 8, sequence_key);
+
+ dump_data_pw("sequence_key:\n", sequence_key, sizeof(sequence_key));
+
+ dump_data_pw("seq_num (before):\n", verf->seq_num, sizeof(verf->seq_num));
+ SamOEMhash(verf->seq_num, sequence_key, 8);
+ dump_data_pw("seq_num (after):\n", verf->seq_num, sizeof(verf->seq_num));
+}
+
+/*******************************************************************
+creates an RPC_AUTH_SCHANNEL_CHK structure.
+********************************************************************/
+
+static BOOL init_rpc_auth_schannel_chk(RPC_AUTH_SCHANNEL_CHK * chk,
+ const uchar sig[8],
+ const uchar packet_digest[8],
+ const uchar seq_num[8], const uchar confounder[8])
+{
+ if (chk == NULL)
+ return False;
+
+ memcpy(chk->sig, sig, sizeof(chk->sig));
+ memcpy(chk->packet_digest, packet_digest, sizeof(chk->packet_digest));
+ memcpy(chk->seq_num, seq_num, sizeof(chk->seq_num));
+ memcpy(chk->confounder, confounder, sizeof(chk->confounder));
+
+ return True;
+}
+
+/*******************************************************************
+ Encode a blob of data using the schannel alogrithm, also produceing
+ a checksum over the original data. We currently only support
+ signing and sealing togeather - the signing-only code is close, but not
+ quite compatible with what MS does.
+ ********************************************************************/
+
+void schannel_encode(struct schannel_auth_struct *a, enum pipe_auth_level auth_level,
+ enum schannel_direction direction,
+ RPC_AUTH_SCHANNEL_CHK * verf,
+ char *data, size_t data_len)
+{
+ uchar digest_final[16];
+ uchar confounder[8];
+ uchar seq_num[8];
+ static const uchar nullbytes[8];
+
+ static const uchar schannel_seal_sig[8] = SCHANNEL_SEAL_SIGNATURE;
+ static const uchar schannel_sign_sig[8] = SCHANNEL_SIGN_SIGNATURE;
+ const uchar *schannel_sig = NULL;
+
+ DEBUG(10,("SCHANNEL: schannel_encode seq_num=%d data_len=%lu\n", a->seq_num, (unsigned long)data_len));
+
+ if (auth_level == PIPE_AUTH_LEVEL_PRIVACY) {
+ schannel_sig = schannel_seal_sig;
+ } else {
+ schannel_sig = schannel_sign_sig;
+ }
+
+ /* fill the 'confounder' with random data */
+ generate_random_buffer(confounder, sizeof(confounder));
+
+ dump_data_pw("a->sess_key:\n", a->sess_key, sizeof(a->sess_key));
+
+ RSIVAL(seq_num, 0, a->seq_num);
+
+ switch (direction) {
+ case SENDER_IS_INITIATOR:
+ SIVAL(seq_num, 4, 0x80);
+ break;
+ case SENDER_IS_ACCEPTOR:
+ SIVAL(seq_num, 4, 0x0);
+ break;
+ }
+
+ dump_data_pw("verf->seq_num:\n", seq_num, sizeof(verf->seq_num));
+
+ init_rpc_auth_schannel_chk(verf, schannel_sig, nullbytes,
+ seq_num, confounder);
+
+ /* produce a digest of the packet to prove it's legit (before we seal it) */
+ schannel_digest(a, auth_level, verf, data, data_len, digest_final);
+ memcpy(verf->packet_digest, digest_final, sizeof(verf->packet_digest));
+
+ if (auth_level == PIPE_AUTH_LEVEL_PRIVACY) {
+ uchar sealing_key[16];
+
+ /* get the key to encode the data with */
+ schannel_get_sealing_key(a, verf, sealing_key);
+
+ /* encode the verification data */
+ dump_data_pw("verf->confounder:\n", verf->confounder, sizeof(verf->confounder));
+ SamOEMhash(verf->confounder, sealing_key, 8);
+
+ dump_data_pw("verf->confounder_enc:\n", verf->confounder, sizeof(verf->confounder));
+
+ /* encode the packet payload */
+ dump_data_pw("data:\n", (const unsigned char *)data, data_len);
+ SamOEMhash((unsigned char *)data, sealing_key, data_len);
+ dump_data_pw("data_enc:\n", (const unsigned char *)data, data_len);
+ }
+
+ /* encode the sequence number (key based on packet digest) */
+ /* needs to be done after the sealing, as the original version
+ is used in the sealing stuff... */
+ schannel_deal_with_seq_num(a, verf);
+
+ return;
+}
+
+/*******************************************************************
+ Decode a blob of data using the schannel alogrithm, also verifiying
+ a checksum over the original data. We currently can verify signed messages,
+ as well as decode sealed messages
+ ********************************************************************/
+
+BOOL schannel_decode(struct schannel_auth_struct *a, enum pipe_auth_level auth_level,
+ enum schannel_direction direction,
+ RPC_AUTH_SCHANNEL_CHK * verf, char *data, size_t data_len)
+{
+ uchar digest_final[16];
+
+ static const uchar schannel_seal_sig[8] = SCHANNEL_SEAL_SIGNATURE;
+ static const uchar schannel_sign_sig[8] = SCHANNEL_SIGN_SIGNATURE;
+ const uchar *schannel_sig = NULL;
+
+ uchar seq_num[8];
+
+ DEBUG(10,("SCHANNEL: schannel_decode seq_num=%d data_len=%lu\n", a->seq_num, (unsigned long)data_len));
+
+ if (auth_level == PIPE_AUTH_LEVEL_PRIVACY) {
+ schannel_sig = schannel_seal_sig;
+ } else {
+ schannel_sig = schannel_sign_sig;
+ }
+
+ /* Create the expected sequence number for comparison */
+ RSIVAL(seq_num, 0, a->seq_num);
+
+ switch (direction) {
+ case SENDER_IS_INITIATOR:
+ SIVAL(seq_num, 4, 0x80);
+ break;
+ case SENDER_IS_ACCEPTOR:
+ SIVAL(seq_num, 4, 0x0);
+ break;
+ }
+
+ DEBUG(10,("SCHANNEL: schannel_decode seq_num=%d data_len=%lu\n", a->seq_num, (unsigned long)data_len));
+ dump_data_pw("a->sess_key:\n", a->sess_key, sizeof(a->sess_key));
+
+ dump_data_pw("seq_num:\n", seq_num, sizeof(seq_num));
+
+ /* extract the sequence number (key based on supplied packet digest) */
+ /* needs to be done before the sealing, as the original version
+ is used in the sealing stuff... */
+ schannel_deal_with_seq_num(a, verf);
+
+ if (memcmp(verf->seq_num, seq_num, sizeof(seq_num))) {
+ /* don't even bother with the below if the sequence number is out */
+ /* The sequence number is MD5'ed with a key based on the whole-packet
+ digest, as supplied by the client. We check that it's a valid
+ checksum after the decode, below
+ */
+ DEBUG(2, ("schannel_decode: FAILED: packet sequence number:\n"));
+ dump_data(2, (const char*)verf->seq_num, sizeof(verf->seq_num));
+ DEBUG(2, ("should be:\n"));
+ dump_data(2, (const char*)seq_num, sizeof(seq_num));
+
+ return False;
+ }
+
+ if (memcmp(verf->sig, schannel_sig, sizeof(verf->sig))) {
+ /* Validate that the other end sent the expected header */
+ DEBUG(2, ("schannel_decode: FAILED: packet header:\n"));
+ dump_data(2, (const char*)verf->sig, sizeof(verf->sig));
+ DEBUG(2, ("should be:\n"));
+ dump_data(2, (const char*)schannel_sig, sizeof(schannel_sig));
+ return False;
+ }
+
+ if (auth_level == PIPE_AUTH_LEVEL_PRIVACY) {
+ uchar sealing_key[16];
+
+ /* get the key to extract the data with */
+ schannel_get_sealing_key(a, verf, sealing_key);
+
+ /* extract the verification data */
+ dump_data_pw("verf->confounder:\n", verf->confounder,
+ sizeof(verf->confounder));
+ SamOEMhash(verf->confounder, sealing_key, 8);
+
+ dump_data_pw("verf->confounder_dec:\n", verf->confounder,
+ sizeof(verf->confounder));
+
+ /* extract the packet payload */
+ dump_data_pw("data :\n", (const unsigned char *)data, data_len);
+ SamOEMhash((unsigned char *)data, sealing_key, data_len);
+ dump_data_pw("datadec:\n", (const unsigned char *)data, data_len);
+ }
+
+ /* digest includes 'data' after unsealing */
+ schannel_digest(a, auth_level, verf, data, data_len, digest_final);
+
+ dump_data_pw("Calculated digest:\n", digest_final,
+ sizeof(digest_final));
+ dump_data_pw("verf->packet_digest:\n", verf->packet_digest,
+ sizeof(verf->packet_digest));
+
+ /* compare - if the client got the same result as us, then
+ it must know the session key */
+ return (memcmp(digest_final, verf->packet_digest,
+ sizeof(verf->packet_digest)) == 0);
+}
projects / samba / blobdiff