samba-mirror/source3/rpc_parse/parse_sec.c

/* 
 *  Unix SMB/Netbios implementation.
 *  Version 1.9.
 *  RPC Pipe client / server routines
 *  Copyright (C) Andrew Tridgell              1992-1998,
 *  Copyright (C) Jeremy R. Allison            1995-2005.
 *  Copyright (C) Luke Kenneth Casson Leighton 1996-1998,
 *  Copyright (C) Paul Ashton                  1997-1998.
 *  
 *  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

/*******************************************************************
 Reads or writes a SEC_ACE structure.
********************************************************************/

static bool sec_io_ace(const char *desc, SEC_ACE *psa, prs_struct *ps,
		       int depth)
{
	uint32 old_offset;
	uint32 offset_ace_size;
	uint8 type;

	if (psa == NULL)
		return False;

	prs_debug(ps, depth, desc, "sec_io_ace");
	depth++;
	
	old_offset = prs_offset(ps);

	if (MARSHALLING(ps)) {
		type = (uint8)psa->type;
	}

	if(!prs_uint8("type ", ps, depth, &type))
		return False;

	if (UNMARSHALLING(ps)) {
		psa->type = (enum security_ace_type)type;
	}

	if(!prs_uint8("flags", ps, depth, &psa->flags))
		return False;

	if(!prs_uint16_pre("size ", ps, depth, &psa->size, &offset_ace_size))
		return False;

	if(!prs_uint32("access_mask", ps, depth, &psa->access_mask))
		return False;

	/* check whether object access is present */
	if (!sec_ace_object(psa->type)) {
		if (!smb_io_dom_sid("trustee  ", &psa->trustee , ps, depth))
			return False;
	} else {
		if (!prs_uint32("obj_flags", ps, depth, &psa->object.object.flags))
			return False;

		if (psa->object.object.flags & SEC_ACE_OBJECT_PRESENT)
			if (!smb_io_uuid("obj_guid", &psa->object.object.type.type, ps,depth))
				return False;

		if (psa->object.object.flags & SEC_ACE_OBJECT_INHERITED_PRESENT)
			if (!smb_io_uuid("inh_guid", &psa->object.object.inherited_type.inherited_type, ps,depth))
				return False;

		if(!smb_io_dom_sid("trustee  ", &psa->trustee , ps, depth))
			return False;
	}

	/* Theorectically an ACE can have a size greater than the
	   sum of its components. When marshalling, pad with extra null bytes up to the
	   correct size. */

	if (MARSHALLING(ps) && (psa->size > prs_offset(ps) - old_offset)) {
		uint32 extra_len = psa->size - (prs_offset(ps) - old_offset);
		uint32 i;
		uint8 c = 0;

		for (i = 0; i < extra_len; i++) {
			if (!prs_uint8("ace extra space", ps, depth, &c))
				return False;
		}
	}

	if(!prs_uint16_post("size ", ps, depth, &psa->size, offset_ace_size, old_offset))
		return False;

	return True;
}

/*******************************************************************
 Reads or writes a SEC_ACL structure.  

 First of the xx_io_xx functions that allocates its data structures
 for you as it reads them.
********************************************************************/

static bool sec_io_acl(const char *desc, SEC_ACL **ppsa, prs_struct *ps,
		       int depth)
{
	unsigned int i;
	uint32 old_offset;
	uint32 offset_acl_size;
	SEC_ACL *psa;
	uint16 revision;

	/*
	 * Note that the size is always a multiple of 4 bytes due to the
	 * nature of the data structure.  Therefore the prs_align() calls
	 * have been removed as they through us off when doing two-layer
	 * marshalling such as in the printing code (RPC_BUFFER).  --jerry
	 */

	if (ppsa == NULL)
		return False;

	psa = *ppsa;

	if(UNMARSHALLING(ps) && psa == NULL) {
		/*
		 * This is a read and we must allocate the stuct to read into.
		 */
		if((psa = PRS_ALLOC_MEM(ps, SEC_ACL, 1)) == NULL)
			return False;
		*ppsa = psa;
	}

	prs_debug(ps, depth, desc, "sec_io_acl");
	depth++;
	
	old_offset = prs_offset(ps);

	if (MARSHALLING(ps)) {
		revision = (uint16)psa->revision;
	}

	if(!prs_uint16("revision", ps, depth, &revision))
		return False;

	if (UNMARSHALLING(ps)) {
		psa->revision = (enum security_acl_revision)revision;
	}

	if(!prs_uint16_pre("size     ", ps, depth, &psa->size, &offset_acl_size))
		return False;

	if(!prs_uint32("num_aces ", ps, depth, &psa->num_aces))
		return False;

	if (UNMARSHALLING(ps)) {
		if (psa->num_aces) {
			if((psa->aces = PRS_ALLOC_MEM(ps, SEC_ACE, psa->num_aces)) == NULL)
				return False;
		} else {
			psa->aces = NULL;
		}
	}

	for (i = 0; i < psa->num_aces; i++) {
		fstring tmp;
		slprintf(tmp, sizeof(tmp)-1, "ace_list[%02d]: ", i);
		if(!sec_io_ace(tmp, &psa->aces[i], ps, depth))
			return False;
	}

	/* Theorectically an ACL can have a size greater than the
	   sum of its components. When marshalling, pad with extra null bytes up to the
	   correct size. */

	if (MARSHALLING(ps) && (psa->size > prs_offset(ps) - old_offset)) {
		uint32 extra_len = psa->size - (prs_offset(ps) - old_offset);
		uint8 c = 0;

		for (i = 0; i < extra_len; i++) {
			if (!prs_uint8("acl extra space", ps, depth, &c))
				return False;
		}
	}

	if(!prs_uint16_post("size     ", ps, depth, &psa->size, offset_acl_size, old_offset))
		return False;

	return True;
}

/*******************************************************************
 Reads or writes a SEC_DESC structure.
 If reading and the *ppsd = NULL, allocates the structure.
********************************************************************/

bool sec_io_desc(const char *desc, SEC_DESC **ppsd, prs_struct *ps, int depth)
{
	uint32 old_offset;
	uint32 max_offset = 0; /* after we're done, move offset to end */
	uint32 tmp_offset = 0;
	uint32 off_sacl, off_dacl, off_owner_sid, off_grp_sid;
	uint16 revision;

	SEC_DESC *psd;

	if (ppsd == NULL)
		return False;

	psd = *ppsd;

	if (psd == NULL) {
		if(UNMARSHALLING(ps)) {
			if((psd = PRS_ALLOC_MEM(ps,SEC_DESC,1)) == NULL)
				return False;
			*ppsd = psd;
		} else {
			/* Marshalling - just ignore. */
			return True;
		}
	}

	prs_debug(ps, depth, desc, "sec_io_desc");
	depth++;

	/* start of security descriptor stored for back-calc offset purposes */
	old_offset = prs_offset(ps);

	if (MARSHALLING(ps)) {
		revision = (uint16)psd->revision;
	}

	if(!prs_uint16("revision", ps, depth, &revision))
		return False;

	if (UNMARSHALLING(ps)) {
		psd->revision = (enum security_descriptor_revision)revision;
	}

	if(!prs_uint16("type     ", ps, depth, &psd->type))
		return False;

	if (MARSHALLING(ps)) {
		uint32 offset = SEC_DESC_HEADER_SIZE;

		/*
		 * Work out the offsets here, as we write it out.
		 */

		if (psd->sacl != NULL) {
			off_sacl = offset;
			offset += psd->sacl->size;
		} else {
			off_sacl = 0;
		}

		if (psd->dacl != NULL) {
			off_dacl = offset;
			offset += psd->dacl->size;
		} else {
			off_dacl = 0;
		}

		if (psd->owner_sid != NULL) {
			off_owner_sid = offset;
			offset += ndr_size_dom_sid(psd->owner_sid, 0);
		} else {
			off_owner_sid = 0;
		}

		if (psd->group_sid != NULL) {
			off_grp_sid = offset;
			offset += ndr_size_dom_sid(psd->group_sid, 0);
		} else {
			off_grp_sid = 0;
		}
	}

	if(!prs_uint32("off_owner_sid", ps, depth, &off_owner_sid))
		return False;

	if(!prs_uint32("off_grp_sid  ", ps, depth, &off_grp_sid))
		return False;

	if(!prs_uint32("off_sacl     ", ps, depth, &off_sacl))
		return False;

	if(!prs_uint32("off_dacl     ", ps, depth, &off_dacl))
		return False;

	max_offset = MAX(max_offset, prs_offset(ps));

	if (off_owner_sid != 0) {

		tmp_offset = prs_offset(ps);
		if(!prs_set_offset(ps, old_offset + off_owner_sid))
			return False;

		if (UNMARSHALLING(ps)) {
			/* reading */
			if((psd->owner_sid = PRS_ALLOC_MEM(ps,DOM_SID,1)) == NULL)
				return False;
		}

		if(!smb_io_dom_sid("owner_sid ", psd->owner_sid , ps, depth))
			return False;

		max_offset = MAX(max_offset, prs_offset(ps));

		if (!prs_set_offset(ps,tmp_offset))
			return False;
	}

	if (psd->group_sid != 0) {

		tmp_offset = prs_offset(ps);
		if(!prs_set_offset(ps, old_offset + off_grp_sid))
			return False;

		if (UNMARSHALLING(ps)) {
			/* reading */
			if((psd->group_sid = PRS_ALLOC_MEM(ps,DOM_SID,1)) == NULL)
				return False;
		}

		if(!smb_io_dom_sid("grp_sid", psd->group_sid, ps, depth))
			return False;
			
		max_offset = MAX(max_offset, prs_offset(ps));

		if (!prs_set_offset(ps,tmp_offset))
			return False;
	}

	if ((psd->type & SEC_DESC_SACL_PRESENT) && off_sacl) {
		tmp_offset = prs_offset(ps);
		if(!prs_set_offset(ps, old_offset + off_sacl))
			return False;
		if(!sec_io_acl("sacl", &psd->sacl, ps, depth))
			return False;
		max_offset = MAX(max_offset, prs_offset(ps));
		if (!prs_set_offset(ps,tmp_offset))
			return False;
	}

	if ((psd->type & SEC_DESC_DACL_PRESENT) && off_dacl != 0) {
		tmp_offset = prs_offset(ps);
		if(!prs_set_offset(ps, old_offset + off_dacl))
			return False;
		if(!sec_io_acl("dacl", &psd->dacl, ps, depth))
			return False;
		max_offset = MAX(max_offset, prs_offset(ps));
		if (!prs_set_offset(ps,tmp_offset))
			return False;
	}

	if(!prs_set_offset(ps, max_offset))
		return False;

	return True;
}

/*******************************************************************
 Reads or writes a SEC_DESC_BUF structure.
********************************************************************/

bool sec_io_desc_buf(const char *desc, SEC_DESC_BUF **ppsdb, prs_struct *ps, int depth)
{
	uint32 off_len;
	uint32 off_max_len;
	uint32 old_offset;
	uint32 size;
	uint32 len;
	SEC_DESC_BUF *psdb;
	uint32 ptr;

	if (ppsdb == NULL)
		return False;

	psdb = *ppsdb;

	if (UNMARSHALLING(ps) && psdb == NULL) {
		if((psdb = PRS_ALLOC_MEM(ps,SEC_DESC_BUF,1)) == NULL)
			return False;
		*ppsdb = psdb;
	}

	prs_debug(ps, depth, desc, "sec_io_desc_buf");
	depth++;

	if(!prs_align(ps))
		return False;
	
	if(!prs_uint32_pre("max_len", ps, depth, &psdb->sd_size, &off_max_len))
		return False;

	ptr = 1;
	if(!prs_uint32    ("ptr  ", ps, depth, &ptr))
		return False;

	len = ndr_size_security_descriptor(psdb->sd, 0);
	if(!prs_uint32_pre("len    ", ps, depth, &len, &off_len))
		return False;

	old_offset = prs_offset(ps);

	/* reading, length is non-zero; writing, descriptor is non-NULL */
	if ((UNMARSHALLING(ps) && psdb->sd_size != 0) || (MARSHALLING(ps) && psdb->sd != NULL)) {
		if(!sec_io_desc("sec   ", &psdb->sd, ps, depth))
			return False;
	}

	if(!prs_align(ps))
		return False;
	
	size = prs_offset(ps) - old_offset;
	if(!prs_uint32_post("max_len", ps, depth, &psdb->sd_size, off_max_len, size == 0 ? psdb->sd_size : size))
		return False;

	if(!prs_uint32_post("len    ", ps, depth, &len, off_len, size))
		return False;

	return True;
}