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Diffstat (limited to 'source3/rpc_parse/parse_prs.c')
| -rw-r--r-- | source3/rpc_parse/parse_prs.c | 1868 |
1 files changed, 1868 insertions, 0 deletions
diff --git a/source3/rpc_parse/parse_prs.c b/source3/rpc_parse/parse_prs.c new file mode 100644 index 0000000000..5eb6c31ee6 --- /dev/null +++ b/source3/rpc_parse/parse_prs.c @@ -0,0 +1,1868 @@ +/* + 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 3 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, see <http://www.gnu.org/licenses/>. +*/ + +#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(const 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(const 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(const char *name, int v, prs_struct *ps, + int from_off, int to_off) +{ + int fd, i; + char *fname = NULL; + ssize_t sz; + if (DEBUGLEVEL < 50) return; + for (i=1;i<100;i++) { + if (v != -1) { + if (asprintf(&fname,"/tmp/%s_%d.%d.prs", name, v, i) < 0) { + return; + } + } else { + if (asprintf(&fname,"/tmp/%s.%d.prs", name, i) < 0) { + return; + } + } + 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)); + } + } + SAFE_FREE(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(5+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. + + NOTE: Contrary to the somewhat confusing naming, this function is not + intended for freeing memory allocated by prs_alloc_mem(). That memory + is attached to the talloc context given by ps->mem_ctx. + ********************************************************************/ + +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 && count) { + /* We can't call the type-safe version here. */ + ret = (char *)_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) { + ps->buffer_size = newsize; + + /* newsize == 0 acts as a free and set pointer to NULL */ + if (newsize == 0) { + SAFE_FREE(ps->data_p); + } else { + ps->data_p = (char *)SMB_REALLOC(ps->data_p, newsize); + + if (ps->data_p == NULL) { + 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; + } + } + } + + 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; + + 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((ps->data_p = (char *)SMB_MALLOC(new_size)) == NULL) { + DEBUG(0,("prs_grow: Malloc failure for size %u.\n", (unsigned int)new_size)); + return False; + } + memset(ps->data_p, '\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 ((ps->data_p = (char *)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(&ps->data_p[ps->buffer_size], '\0', (size_t)(new_size - ps->buffer_size)); + } + ps->buffer_size = new_size; + + 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; + + 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((ps->data_p = (char *)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(&ps->data_p[ps->buffer_size], '\0', (size_t)(new_size - ps->buffer_size)); + + ps->buffer_size = new_size; + + 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_data(prs_struct *dst, void *src_base, uint32_t start, + uint32_t len) +{ + if (len == 0) { + return true; + } + + if(!prs_grow(dst, len)) { + return false; + } + + memcpy(&dst->data_p[dst->data_offset], ((char *)src_base) + start, (size_t)len); + dst->data_offset += len; + return true; +} + +bool prs_append_some_prs_data(prs_struct *dst, prs_struct *src, int32 start, + uint32 len) +{ + return prs_append_some_data(dst, src->data_p, start, len); +} + +/******************************************************************* + 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(5,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 *dta, size_t data_size, + bool (*prs_fn)(const char*, prs_struct*, int, void*) ) +{ + void ** data = (void **)dta; + 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_size) { + if ( !(*data = PRS_ALLOC_MEM(ps, char, data_size)) ) + return False; + } else { + *data = NULL; + } + } + + 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(5,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(5,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(5,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(5,depth), ps->data_offset, name, + nt_errstr(*status))); + + ps->data_offset += sizeof(uint32); + + return True; +} + +/******************************************************************* + Stream a DCE error code + ********************************************************************/ + +bool prs_dcerpc_status(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(5,depth), ps->data_offset, name, + dcerpc_errstr(NT_STATUS_V(*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(5,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(5,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(5,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(5,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(5,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 the string is empty, we don't have anything to stream */ + if (str->buf_len==0) + return True; + + if (UNMARSHALLING(ps)) { + str->buffer = PRS_ALLOC_MEM(ps,uint16,str->buf_len); + if (str->buffer == NULL) + return False; + } + + 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; + } else { + buf->buffer = NULL; + } + } + + 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; + } + if (str->str_max_len) { + str->buffer = PRS_ALLOC_MEM(ps,unsigned char, str->str_max_len); + if (str->buffer == NULL) + return False; + } else { + str->buffer = NULL; + /* Return early to ensure Coverity isn't confused. */ + DEBUG(5,("%s%04x %s: \n", tab_depth(5,depth), ps->data_offset, name)); + return True; + } + } + + 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(5,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; + } + if (str->uni_max_len) { + str->buffer = PRS_ALLOC_MEM(ps,uint16,str->uni_max_len); + if (str->buffer == NULL) + return False; + } else { + str->buffer = NULL; + } + } + + 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)) { + if (str->uni_str_len) { + str->str.buffer = PRS_ALLOC_MEM(ps,uint16,str->uni_str_len); + if (str->str.buffer == NULL) + return False; + } else { + str->str.buffer = NULL; + } + } + + 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(5,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(5,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, (uint8 *)q, len); + + return True; +} + +bool prs_string_alloc(const char *name, prs_struct *ps, int depth, const char **str) +{ + size_t len; + char *tmp_str; + + if (UNMARSHALLING(ps)) { + len = strlen(&ps->data_p[ps->data_offset]); + } else { + len = strlen(*str); + } + + tmp_str = PRS_ALLOC_MEM(ps, char, len+1); + + if (tmp_str == NULL) { + return False; + } + + if (MARSHALLING(ps)) { + strncpy(tmp_str, *str, len); + } + + if (!prs_string(name, ps, depth, tmp_str, len+1)) { + return False; + } + + *str = tmp_str; + 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, TDB_DATA kbuf, prs_struct *ps) +{ + TDB_DATA dbuf; + dbuf.dptr = (uint8 *)ps->data_p; + dbuf.dsize = prs_offset(ps); + return tdb_trans_store(tdb, kbuf, dbuf, TDB_REPLACE); +} + +/* useful function to fetch a structure into rpc wire format */ +int tdb_prs_fetch(TDB_CONTEXT *tdb, TDB_DATA kbuf, prs_struct *ps, TALLOC_CTX *mem_ctx) +{ + TDB_DATA dbuf; + + prs_init_empty(ps, mem_ctx, UNMARSHALL); + + dbuf = tdb_fetch(tdb, kbuf); + if (!dbuf.dptr) + return -1; + + prs_give_memory(ps, (char *)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, (uint8 *)ps->sess_key, 16); + dump_data(100, (uint8 *)q, len); +#endif + SamOEMhash((uchar *) q, (const unsigned char *)ps->sess_key, len); + +#ifdef DEBUG_PASSWORD + dump_data(100, (uint8 *)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]; + uchar zeros[4]; + struct MD5Context ctx3; + + ZERO_STRUCT(zeros); + + /* 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]) +{ + uchar zeros[4]; + uchar digest2[16]; + uchar sess_kf0[16]; + int i; + + ZERO_STRUCT(zeros); + + 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) +{ + uchar zeros[4]; + uchar sequence_key[16]; + uchar digest1[16]; + + ZERO_STRUCT(zeros); + + 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] = { 0, }; + + 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, verf->seq_num, sizeof(verf->seq_num)); + DEBUG(2, ("should be:\n")); + dump_data(2, 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, verf->sig, sizeof(verf->sig)); + DEBUG(2, ("should be:\n")); + dump_data(2, 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); +} + +/******************************************************************* +creates a new prs_struct containing a DATA_BLOB +********************************************************************/ +bool prs_init_data_blob(prs_struct *prs, DATA_BLOB *blob, TALLOC_CTX *mem_ctx) +{ + if (!prs_init( prs, RPC_MAX_PDU_FRAG_LEN, mem_ctx, MARSHALL )) + return False; + + + if (!prs_copy_data_in(prs, (char *)blob->data, blob->length)) + return False; + + return True; +} + +/******************************************************************* +return the contents of a prs_struct in a DATA_BLOB +********************************************************************/ +bool prs_data_blob(prs_struct *prs, DATA_BLOB *blob, TALLOC_CTX *mem_ctx) +{ + blob->length = prs_data_size(prs); + blob->data = (uint8 *)TALLOC_ZERO_SIZE(mem_ctx, blob->length); + + /* set the pointer at the end of the buffer */ + prs_set_offset( prs, prs_data_size(prs) ); + + if (!prs_copy_all_data_out((char *)blob->data, prs)) + return False; + + return True; +} |