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setcifsacl.c
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/*
* setcifsacl utility
*
* Copyright (C) Shirish Pargaonkar ([email protected]) 2011
*
* Used to alter entries of an ACL or replace an entire ACL in a
* security descriptor of a file system object that belongs to a
* share mounted using option cifsacl.
*
* 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
/*
* This utility modifies various components of the security descriptor. These
* actions require different permissions and different SMB protocol-level flags.
* The user needs to make sure the share is mounted using the user credentials
* for the user who has appropriate permissions and privileges. The kernel
* CIFS client knows which flags to use based on the extended attribute name:
* - system.cifs_acl - set dacl only
* - system.cifs_ndst - set dacl and owner info
* - system.cifs_ntsd_full - set dacl, owner, and sacl
*
* For simplicity, the utility modifies one component of the descriptor:
* owner sid, group sid, DACL, or SACL. The rest of the descriptor is unchanged.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif /* HAVE_CONFIG_H */
#include <endian.h>
#include <string.h>
#include <getopt.h>
#include <stdint.h>
#include <stdbool.h>
#include <unistd.h>
#include <stdio.h>
#include <stdlib.h>
#include <errno.h>
#include <limits.h>
#include <ctype.h>
#include <linux/limits.h>
#include <sys/xattr.h>
#include "cifsacl.h"
#include "idmap_plugin.h"
#include <assert.h>
enum setcifsacl_actions {
ActUnknown = -1,
ActDelete,
ActModify,
ActAdd,
ActSetAcl,
ActSetOwner,
ActSetGroup,
ActSetSacl,
ActAddReorder
};
static void *plugin_handle;
static bool plugin_loaded;
static int
copy_cifs_sid(struct cifs_sid *dst, const struct cifs_sid *src)
{
int i, size = 0;
dst->revision = src->revision;
size += sizeof(uint8_t);
dst->num_subauth = src->num_subauth;
size += sizeof(uint8_t);
for (i = 0; i < NUM_AUTHS; i++)
dst->authority[i] = src->authority[i];
size += (sizeof(uint8_t) * NUM_AUTHS);
for (i = 0; i < src->num_subauth; i++)
dst->sub_auth[i] = src->sub_auth[i];
size += (sizeof(uint32_t) * src->num_subauth);
return size;
}
static int
get_cifs_sid_size(const struct cifs_sid *sid)
{
return (2 * sizeof(uint8_t) +
sizeof(uint8_t) * NUM_AUTHS +
sizeof(uint32_t) * sid->num_subauth);
}
/*
* This function takes a pointer of the fetched (original) descriptor, and
* it returns the offset of the ACL in the new descriptor.
*
* If the original descriptor does not have an ACL, the corresponding offset
* is 0, and we need to determine where to place the ACL in the new descriptor.
* If SACL offset is zero, and there is DACL (dacloffset is not 0), then we will
* put SACL after DACL. If the DACL is not present either, we do not know if the
* ACLs should go before or after the owner and group SIDs (see below), and so
* we will use the offset right past the group SID.
* Similarly, if DACL offset is zero, we will use the offset the past the end
* of group SID.
* @todo: need to add a command-line argument to know if this is
* Azure-style descriptor or a regular-style descriptor
*/
static int get_aces_offset(const struct cifs_ntsd *pntsd, ace_kinds ace_kind) {
int dacloffset, sacloffset, acesoffset;
switch(ace_kind) {
case ACE_KIND_SACL:
sacloffset = le32toh(pntsd->sacloffset);
if (sacloffset) {
acesoffset = sacloffset + sizeof(struct cifs_ctrl_acl);
} else {
dacloffset = le32toh(pntsd->dacloffset);
if (dacloffset) {
struct cifs_ctrl_acl *dacl_ptr =
(struct cifs_ctrl_acl *)((char *)pntsd +
dacloffset);
acesoffset = dacloffset +
le16toh(dacl_ptr->size) +
sizeof(struct cifs_ctrl_acl);
} else {
int gsidoffset = le32toh(pntsd->gsidoffset);
struct cifs_sid *group_sid_ptr =
(struct cifs_sid *)((char *)pntsd +
gsidoffset);
int gsidsize = get_cifs_sid_size(group_sid_ptr);
acesoffset = gsidoffset + gsidsize +
sizeof(struct cifs_ctrl_acl);
}
}
break;
case ACE_KIND_DACL:
default:
dacloffset = le32toh(pntsd->dacloffset);
if (dacloffset) {
acesoffset = dacloffset + sizeof(struct cifs_ctrl_acl);
} else {
int gsidoffset = le32toh(pntsd->gsidoffset);
struct cifs_sid *group_sid_ptr =
(struct cifs_sid *)((char *)pntsd +
gsidoffset);
int gsidsize = get_cifs_sid_size(group_sid_ptr);
acesoffset = gsidoffset + gsidsize +
sizeof(struct cifs_ctrl_acl);
}
break;
}
return acesoffset;
}
int get_aces_size(const struct cifs_ntsd *pntsd, ace_kinds ace_kind) {
int acloffset, size;
struct cifs_ctrl_acl *acl_ptr;
switch(ace_kind) {
case ACE_KIND_SACL:
acloffset = le32toh(pntsd->sacloffset);
break;
case ACE_KIND_DACL:
default:
acloffset = le32toh(pntsd->dacloffset);
}
if (acloffset) {
acl_ptr = (struct cifs_ctrl_acl *)((char *)pntsd + acloffset);
size = le16toh(acl_ptr->size);
} else {
size = 0;
}
return size;
}
uint16_t get_acl_revision(const struct cifs_ntsd *pntsd, ace_kinds ace_kind) {
struct cifs_ctrl_acl *acl_ptr;
int acloffset;
switch(ace_kind) {
case ACE_KIND_SACL:
acloffset = le32toh(pntsd->sacloffset);
if (acloffset) {
acl_ptr = (struct cifs_ctrl_acl *)((char *)pntsd +
acloffset);
return acl_ptr->revision;
}
/* intentional fall through */
case ACE_KIND_DACL:
default:
acloffset = le32toh(pntsd->dacloffset);
if (acloffset) {
acl_ptr = (struct cifs_ctrl_acl *)((char *)pntsd +
acloffset);
return acl_ptr->revision;
} else {
return DEFAULT_ACL_REVISION;
}
break;
}
}
/*
* The actual changes to the ACL specified in ace_kind are performed by the
* caller of this function; this function copies/backfills the remaining
* relevant compoenents of the security descriptor that remain unchanged.
*/
static ssize_t
copy_sec_desc(const struct cifs_ntsd *pntsd, struct cifs_ntsd *pnntsd,
int numaces, int acessize, ace_kinds ace_kind)
{
int size, osidsoffset, gsidsoffset, acloffset, dacloffset;
ssize_t bufsize;
struct cifs_sid *owner_sid_ptr, *group_sid_ptr;
struct cifs_sid *nowner_sid_ptr, *ngroup_sid_ptr;
struct cifs_ctrl_acl *nacl_ptr, *dacl_ptr;
char *ndacl_ptr;
/* copy security descriptor control portion */
osidsoffset = le32toh(pntsd->osidoffset);
gsidsoffset = le32toh(pntsd->gsidoffset);
size = sizeof(struct cifs_ntsd);
pnntsd->revision = pntsd->revision;
pnntsd->type = pntsd->type;
pnntsd->osidoffset = pntsd->osidoffset;
pnntsd->gsidoffset = pntsd->gsidoffset;
pnntsd->dacloffset = pntsd->dacloffset;
bufsize = size;
/* owner and group SIDs in the original defscriptor */
owner_sid_ptr = (struct cifs_sid *)((char *)pntsd + osidsoffset);
group_sid_ptr = (struct cifs_sid *)((char *)pntsd + gsidsoffset);
/* get the offset of the acl control structure to initialize */
acloffset = get_aces_offset(pntsd, ace_kind) - sizeof(struct cifs_ctrl_acl);
if (ace_kind == ACE_KIND_SACL) {
/* copy (unchanged) DACL if present, increment bufsize */
dacloffset = le32toh(pntsd->dacloffset);
if (dacloffset) {
dacl_ptr = (struct cifs_ctrl_acl *)((char *)pntsd + dacloffset);
ndacl_ptr = (char *)pnntsd + dacloffset;
size = sizeof(struct cifs_ctrl_acl) + le16toh(dacl_ptr->size);
memcpy(ndacl_ptr, (char *)dacl_ptr, size);
bufsize += size;
}
/* initialize SACL offset */
pnntsd->sacloffset = acloffset;
}
nacl_ptr = (struct cifs_ctrl_acl *)((char *)pnntsd + acloffset);
nacl_ptr->revision = get_acl_revision(pntsd, ace_kind);
size = acessize + sizeof(struct cifs_ctrl_acl);
nacl_ptr->size = htole16(size);
nacl_ptr->num_aces = htole32(numaces);
bufsize += size;
/* copy owner sid */
/*
* some servers like Azure return the owner and group SIDs at end rather
* than at the beginning of the ACL so don't want to overwrite the last ACEs
*/
if (acloffset <= osidsoffset) {
/* owners placed at end of ACL */
nowner_sid_ptr = (struct cifs_sid *)((char *)pnntsd + acloffset + size);
osidsoffset = acloffset + size;
pnntsd->osidoffset = htole32(osidsoffset);
size = copy_cifs_sid(nowner_sid_ptr, owner_sid_ptr);
bufsize += size;
/* put group SID after owner SID */
ngroup_sid_ptr = (struct cifs_sid *)((char *)nowner_sid_ptr + size);
gsidsoffset = osidsoffset + size;
pnntsd->gsidoffset = htole32(gsidsoffset);
} else {
/*
* Most servers put the owner information at the beginning,
* before the ACL
*/
nowner_sid_ptr = (struct cifs_sid *)((char *)pnntsd + osidsoffset);
size = copy_cifs_sid(nowner_sid_ptr, owner_sid_ptr);
bufsize += size;
ngroup_sid_ptr = (struct cifs_sid *)((char *)pnntsd + gsidsoffset);
}
/* copy group sid */
size = copy_cifs_sid(ngroup_sid_ptr, group_sid_ptr);
bufsize += size;
return bufsize;
}
/*
* This function does not need to set the SACL-related fields, and this works
* fine because the code path calling this function picks the 'system.cifs_ntsd'
* attribute name. This name tells Linux CIFS client that SACL is not modified.
*/
static ssize_t
copy_sec_desc_with_sid(const struct cifs_ntsd *pntsd, struct cifs_ntsd *pnntsd,
struct cifs_sid *sid, int maction)
{
int size, daclsize;
int osidoffset, gsidoffset, dacloffset;
int nosidoffset, ngsidoffset, ndacloffset, nsidssize;
ssize_t bufsize;
struct cifs_sid *owner_sid_ptr, *group_sid_ptr;
struct cifs_sid *nowner_sid_ptr, *ngroup_sid_ptr;
struct cifs_ctrl_acl *dacl_ptr, *ndacl_ptr;
/* copy security descriptor control portion */
osidoffset = le32toh(pntsd->osidoffset);
gsidoffset = le32toh(pntsd->gsidoffset);
dacloffset = le32toh(pntsd->dacloffset);
/*
* the size of the owner or group sid might be different from the old
* one, so the group sid offest might change, and if the owner is
* positioned before the DACL, the dacl offset might change as well;
* note however, that the owner sid offset does not change
*/
nosidoffset = osidoffset;
size = sizeof(struct cifs_ntsd);
pnntsd->revision = pntsd->revision;
pnntsd->type = pntsd->type;
pnntsd->osidoffset = pntsd->osidoffset;
bufsize = size;
/* set the pointers for source sids */
assert(maction == ActSetOwner || maction == ActSetGroup);
if (maction == ActSetOwner) {
owner_sid_ptr = sid;
group_sid_ptr = (struct cifs_sid *)((char *)pntsd + gsidoffset);
}
if (maction == ActSetGroup) {
owner_sid_ptr = (struct cifs_sid *)((char *)pntsd + osidoffset);
group_sid_ptr = sid;
}
if (dacloffset) {
dacl_ptr = (struct cifs_ctrl_acl *)((char *)pntsd + dacloffset);
daclsize = le16toh(dacl_ptr->size) + sizeof(struct cifs_ctrl_acl);
} else {
dacl_ptr = NULL;
daclsize = 0;
}
/* copy owner sid */
nowner_sid_ptr = (struct cifs_sid *)((char *)pnntsd + nosidoffset);
size = copy_cifs_sid(nowner_sid_ptr, owner_sid_ptr);
bufsize += size;
nsidssize = size;
/* copy group sid */
ngsidoffset = nosidoffset + size;
ngroup_sid_ptr = (struct cifs_sid *)((char *)pnntsd + ngsidoffset);
pnntsd->gsidoffset = htole32(ngsidoffset);
size = copy_cifs_sid(ngroup_sid_ptr, group_sid_ptr);
bufsize += size;
nsidssize += size;
/* position the dacl control info as in the fetched descriptor */
if (dacloffset) {
if (dacloffset <= osidoffset)
ndacloffset = dacloffset;
else
ndacloffset = nosidoffset + nsidssize;
ndacl_ptr = (struct cifs_ctrl_acl *)((char *)pnntsd + ndacloffset);
pnntsd->dacloffset = htole32(ndacloffset);
/* the DACL control fields do not change */
ndacl_ptr->revision = dacl_ptr->revision;
ndacl_ptr->size = dacl_ptr->size;
ndacl_ptr->num_aces = dacl_ptr->num_aces;
} else {
pnntsd->dacloffset = 0;
}
/*
* add DACL size (control portion and the array of aces) to the
* buffer size
*/
bufsize += daclsize;
return bufsize;
}
static int
copy_ace(struct cifs_ace *dace, struct cifs_ace *sace)
{
dace->type = sace->type;
dace->flags = sace->flags;
dace->access_req = sace->access_req;
copy_cifs_sid(&dace->sid, &sace->sid);
dace->size = sace->size;
return le16toh(dace->size);
}
static int
compare_aces(struct cifs_ace *sace, struct cifs_ace *dace, int compflags)
{
int i;
if (compflags & COMPSID) {
if (dace->sid.revision != sace->sid.revision)
return 0;
if (dace->sid.num_subauth != sace->sid.num_subauth)
return 0;
for (i = 0; i < NUM_AUTHS; i++) {
if (dace->sid.authority[i] != sace->sid.authority[i])
return 0;
}
for (i = 0; i < sace->sid.num_subauth; i++) {
if (dace->sid.sub_auth[i] != sace->sid.sub_auth[i])
return 0;
}
}
if (compflags & COMPTYPE) {
if (dace->type != sace->type)
return 0;
}
if (compflags & COMPFLAG) {
if (dace->flags != sace->flags)
return 0;
}
if (compflags & COMPMASK) {
if (dace->access_req != sace->access_req)
return 0;
}
return 1;
}
/*
* This is somewhat suboptimal, but to keep the code simple, we will still
* allocate the ACL control headers for DACL and SACL even thought there is
* no corresponding ACL (dacloffset = 0 or sacloffset = 0).
* When seetting DACL, we allocate sufficient space for the descriptor control
* structure, owner and group sids, and the DACL (ACL control structure and
* the aces).
* When setting SACL, we allocate sufficient space to copy the above components
* plus the SACL to be set (ACL controla and aces).
*/
static int
alloc_sec_desc(struct cifs_ntsd *pntsd, struct cifs_ntsd **npntsd,
int aces, size_t *acesoffset, ace_kinds ace_kind)
{
unsigned int size, acessize, bufsize;
switch(ace_kind) {
case ACE_KIND_SACL:
size = sizeof(struct cifs_ntsd) +
2 * sizeof(struct cifs_sid) +
sizeof(struct cifs_ctrl_acl) +
get_aces_size(pntsd, ACE_KIND_DACL) +
sizeof(struct cifs_ctrl_acl);
break;
case ACE_KIND_DACL:
default:
size = sizeof(struct cifs_ntsd) +
2 * sizeof(struct cifs_sid) +
sizeof(struct cifs_ctrl_acl);
break;
}
*acesoffset = get_aces_offset(pntsd, ace_kind);
acessize = aces * sizeof(struct cifs_ace);
bufsize = size + acessize;
*npntsd = calloc(1, bufsize);
if (!*npntsd) {
fprintf(stderr, "%s: Memory allocation failure", __func__);
return errno;
}
return 0;
}
static struct cifs_ace **
build_reorder_aces(struct cifs_ace **facesptr, int numfaces)
{
struct cifs_ace *pace, **allowedacesptr, **deniedacesptr,
**allowedinhacesptr, **deniedinhacesptr, **reorderacesptr;
int i, numallowedaces, numdeniedaces,
numallowedinhaces, numdeniedinhaces, numreorderaces;
allowedacesptr = calloc(numfaces, sizeof(struct cifs_ace *));
deniedacesptr = calloc(numfaces, sizeof(struct cifs_ace *));
allowedinhacesptr = calloc(numfaces, sizeof(struct cifs_ace *));
deniedinhacesptr = calloc(numfaces, sizeof(struct cifs_ace *));
reorderacesptr = calloc(numfaces, sizeof(struct cifs_ace *));
numallowedaces = 0;
numdeniedaces = 0;
numallowedinhaces = 0;
numdeniedinhaces = 0;
numreorderaces = 0;
for (i = 0; i < numfaces; i++) {
pace = facesptr[i];
if ((pace->type == ACCESS_DENIED) || (pace->type == ACCESS_DENIED_OBJECT)) {
if (!(pace->flags & INHERITED_ACE_FLAG)) {
deniedacesptr[numdeniedaces] = malloc(sizeof(struct cifs_ace));
memcpy(deniedacesptr[numdeniedaces], pace, sizeof(struct cifs_ace));
numdeniedaces++;
} else {
deniedinhacesptr[numdeniedinhaces] = malloc(sizeof(struct cifs_ace));
memcpy(deniedinhacesptr[numdeniedinhaces], pace, sizeof(struct cifs_ace));
numdeniedinhaces++;
}
} else if ((pace->type == ACCESS_ALLOWED) || (pace->type == ACCESS_ALLOWED_OBJECT)) {
if (!(pace->flags & INHERITED_ACE_FLAG)) {
allowedacesptr[numallowedaces] = malloc(sizeof(struct cifs_ace));
memcpy(allowedacesptr[numallowedaces], pace, sizeof(struct cifs_ace));
numallowedaces++;
} else {
allowedinhacesptr[numallowedinhaces] = malloc(sizeof(struct cifs_ace));
memcpy(allowedinhacesptr[numallowedinhaces], pace, sizeof(struct cifs_ace));
numallowedinhaces++;
}
}
}
for (i = 0; i < numdeniedaces; i++) {
reorderacesptr[numreorderaces] = malloc(sizeof(struct cifs_ace));
memcpy(reorderacesptr[numreorderaces], deniedacesptr[i], sizeof(struct cifs_ace));
numreorderaces++;
free(deniedacesptr[i]);
}
for (i = 0; i < numallowedaces; i++) {
reorderacesptr[numreorderaces] = malloc(sizeof(struct cifs_ace));
memcpy(reorderacesptr[numreorderaces], allowedacesptr[i], sizeof(struct cifs_ace));
numreorderaces++;
free(allowedacesptr[i]);
}
for (i = 0; i < numdeniedinhaces; i++) {
reorderacesptr[numreorderaces] = malloc(sizeof(struct cifs_ace));
memcpy(reorderacesptr[numreorderaces], deniedinhacesptr[i], sizeof(struct cifs_ace));
numreorderaces++;
free(deniedinhacesptr[i]);
}
for (i = 0; i < numallowedinhaces; i++) {
reorderacesptr[numreorderaces] = malloc(sizeof(struct cifs_ace));
memcpy(reorderacesptr[numreorderaces], allowedinhacesptr[i], sizeof(struct cifs_ace));
numreorderaces++;
free(allowedinhacesptr[i]);
}
free(deniedacesptr);
free(allowedacesptr);
free(deniedinhacesptr);
free(allowedinhacesptr);
return reorderacesptr;
}
static int
ace_set(struct cifs_ntsd *pntsd, struct cifs_ntsd **npntsd, ssize_t *bufsize,
struct cifs_ace **cacesptr, int numcaces, ace_kinds ace_kind)
{
int i, rc, size = 0, acessize = 0;
size_t acesoffset;
char *acesptr;
rc = alloc_sec_desc(pntsd, npntsd, numcaces, &acesoffset, ace_kind);
if (rc)
return rc;
acesptr = (char *)*npntsd + acesoffset;
for (i = 0; i < numcaces; ++i) {
size = copy_ace((struct cifs_ace *)acesptr, cacesptr[i]);
acessize += size;
acesptr += size;
}
*bufsize = copy_sec_desc(pntsd, *npntsd, numcaces, acessize, ace_kind);
return 0;
}
static int
ace_add(struct cifs_ntsd *pntsd, struct cifs_ntsd **npntsd, ssize_t *bufsize,
struct cifs_ace **facesptr, int numfaces,
struct cifs_ace **cacesptr, int numcaces,
ace_kinds ace_kind)
{
int i, rc, numaces, size, acessize = 0;
size_t acesoffset;
char *acesptr;
numaces = numfaces + numcaces;
rc = alloc_sec_desc(pntsd, npntsd, numaces, &acesoffset, ace_kind);
if (rc)
return rc;
acesptr = (char *)*npntsd + acesoffset;
for (i = 0; i < numfaces; ++i) {
size = copy_ace((struct cifs_ace *)acesptr, facesptr[i]);
acesptr += size;
acessize += size;
}
for (i = 0; i < numcaces; ++i) {
size = copy_ace((struct cifs_ace *)acesptr, cacesptr[i]);
acesptr += size;
acessize += size;
}
*bufsize = copy_sec_desc(pntsd, *npntsd, numaces, acessize, ace_kind);
return 0;
}
static int
ace_add_reorder(struct cifs_ntsd *pntsd, struct cifs_ntsd **npntsd, ssize_t *bufsize,
struct cifs_ace **facesptr, int numfaces,
struct cifs_ace **cacesptr, int numcaces,
ace_kinds ace_kind)
{
struct cifs_ace **reorderacesptr, **totalacesptr;
int i, rc, numaces;
numaces = numfaces + numcaces;
totalacesptr = calloc(numaces, sizeof(struct cifs_ace *));
for (i = 0; i < numfaces; i++) {
totalacesptr[i] = facesptr[i];
}
for (i = numfaces; i < numaces; i++) {
totalacesptr[i] = cacesptr[i - numfaces];
}
reorderacesptr = build_reorder_aces(totalacesptr, numaces);
rc = ace_add(pntsd, npntsd, bufsize, reorderacesptr,
numaces, cacesptr, 0, ace_kind);
free(totalacesptr);
free(reorderacesptr);
return rc;
}
static int
ace_modify(struct cifs_ntsd *pntsd, struct cifs_ntsd **npntsd, ssize_t *bufsize,
struct cifs_ace **facesptr, int numfaces,
struct cifs_ace **cacesptr, int numcaces,
ace_kinds ace_kind)
{
int i, j, rc, size, acessize = 0;
size_t acesoffset;
char *acesptr;
if (numfaces == 0) {
fprintf(stderr, "%s: No entries to modify", __func__);
return -1;
}
rc = alloc_sec_desc(pntsd, npntsd, numfaces, &acesoffset, ace_kind);
if (rc)
return rc;
for (j = 0; j < numcaces; ++j) {
for (i = 0; i < numfaces; ++i) {
if (compare_aces(facesptr[i], cacesptr[j],
COMPSID | COMPTYPE)) {
copy_ace(facesptr[i], cacesptr[j]);
break;
}
}
}
acesptr = (char *)*npntsd + acesoffset;
for (i = 0; i < numfaces; ++i) {
size = copy_ace((struct cifs_ace *)acesptr, facesptr[i]);
acesptr += size;
acessize += size;
}
*bufsize = copy_sec_desc(pntsd, *npntsd, numfaces, acessize, ace_kind);
return 0;
}
static int
ace_delete(struct cifs_ntsd *pntsd, struct cifs_ntsd **npntsd, ssize_t *bufsize,
struct cifs_ace **facesptr, int numfaces,
struct cifs_ace **cacesptr, int numcaces,
ace_kinds ace_kind)
{
int i, j, numaces = 0, rc, size, acessize = 0;
size_t acesoffset;
char *acesptr;
if (numfaces == 0) {
fprintf(stderr, "%s: No entries to delete\n", __func__);
return -1;
}
if (numfaces < numcaces) {
fprintf(stderr, "%s: Invalid entries to delete\n", __func__);
return -1;
}
rc = alloc_sec_desc(pntsd, npntsd, numfaces, &acesoffset, ace_kind);
if (rc)
return rc;
acesptr = (char *)*npntsd + acesoffset;
for (i = 0; i < numfaces; ++i) {
for (j = 0; j < numcaces; ++j) {
if (compare_aces(facesptr[i], cacesptr[j], COMPALL))
break;
}
if (j == numcaces) {
size = copy_ace((struct cifs_ace *)acesptr,
facesptr[i]);
acessize += size;
acesptr += size;
++numaces;
}
}
if (numaces == numfaces) {
fprintf(stderr, "%s: Nothing to delete\n", __func__);
return 1;
}
*bufsize = copy_sec_desc(pntsd, *npntsd, numaces, acessize, ace_kind);
return 0;
}
static int
get_numfaces(struct cifs_ntsd *pntsd, ssize_t acl_len,
struct cifs_ctrl_acl **aclptr, ace_kinds ace_kind)
{
int numfaces = 0;
uint32_t acloffset;
struct cifs_ctrl_acl *laclptr;
char *end_of_acl = ((char *)pntsd) + acl_len;
switch(ace_kind) {
case ACE_KIND_SACL:
acloffset = le32toh(pntsd->sacloffset);
break;
case ACE_KIND_DACL:
default:
acloffset = le32toh(pntsd->dacloffset);
break;
}
if (!acloffset)
return 0;
laclptr = (struct cifs_ctrl_acl *)((char *)pntsd + acloffset);
/* validate that we do not go past end of acl */
if (end_of_acl >= (char *)laclptr + le16toh(laclptr->size)) {
numfaces = le32toh(laclptr->num_aces);
*aclptr = laclptr;
}
return numfaces;
}
static struct cifs_ace **
build_fetched_aces(char *aclptr, int numfaces)
{
int i, acl_size;
char *acl_base;
struct cifs_ace *pace, **facesptr;
facesptr = calloc(numfaces, sizeof(struct cifs_ace *));
if (!facesptr) {
fprintf(stderr, "%s: Error %d allocating ACE array",
__func__, errno);
return facesptr;
}
acl_base = aclptr;
acl_size = sizeof(struct cifs_ctrl_acl);
for (i = 0; i < numfaces; ++i) {
facesptr[i] = malloc(sizeof(struct cifs_ace));
if (!facesptr[i])
goto build_fetched_aces_err;
pace = (struct cifs_ace *) (acl_base + acl_size);
memcpy(facesptr[i], pace, sizeof(struct cifs_ace));
acl_base = (char *)pace;
acl_size = le16toh(pace->size);
}
return facesptr;
build_fetched_aces_err:
fprintf(stderr, "%s: Invalid fetched ace\n", __func__);
for (i = 0; i < numfaces; ++i)
free(facesptr[i]);
free(facesptr);
return NULL;
}
static int
verify_ace_type(char *typestr, uint8_t *typeval, ace_kinds ace_kind)
{
int i, len;
char *invaltype;
uint8_t ace_type_mask;
switch(ace_kind) {
case ACE_KIND_SACL:
ace_type_mask = SACL_VTYPES;
break;
case ACE_KIND_DACL:
default:
ace_type_mask = DACL_VTYPES;
break;
}
if (strstr(typestr, "0x")) { /* hex type value */
*typeval = strtol(typestr, &invaltype, 16);
if (!strlen(invaltype)) {
/* the type must be a single bit from the bit mask */
if (*typeval != (*typeval & ace_type_mask)) {
fprintf(stderr, "%s: Invalid type: %s\n",
__func__, typestr);
return 1;
}
return 0;
}
}
len = strlen(typestr);
switch(ace_kind) {
case ACE_KIND_SACL:
for (i = 0; i < len; ++i)
*(typestr + i) = toupper(*(typestr + i));
if (!strcmp(typestr, "AUDIT"))
*typeval = SYSTEM_AUDIT;
else if (!strcmp(typestr, "AUDIT_OBJECT"))
*typeval = SYSTEM_AUDIT_OBJECT;
else if (!strcmp(typestr, "AUDIT_CALLBACK"))
*typeval = SYSTEM_AUDIT_CALLBACK;
else if (!strcmp(typestr, "AUDIT_CALLBACK_OBJECT"))
*typeval = SYSTEM_AUDIT_CALLBACK_OBJECT;
else if (!strcmp(typestr, "MANDATODY_LABEL"))
*typeval = SYSTEM_MANDATORY_LABEL;
else if (!strcmp(typestr, "RESOURCE_ATTRIBUTE"))
*typeval = SYSTEM_RESOURCE_ATTRIBUTE;
else if (!strcmp(typestr, "SCOPED_POLICY_ID"))
*typeval = SYSTEM_SCOPED_POLICY_ID;
else {
fprintf(stderr, "%s: Invalid type: %s\n", __func__,
typestr);
return 1;
}
break;
case ACE_KIND_DACL:
default:
for (i = 0; i < len; ++i)
*(typestr + i) = toupper(*(typestr + i));
if (!strcmp(typestr, "ALLOWED"))
*typeval = ACCESS_ALLOWED;
else if (!strcmp(typestr, "DENIED"))
*typeval = ACCESS_DENIED;
else if (!strcmp(typestr, "ALLOWED_OBJECT"))
*typeval = ACCESS_ALLOWED_OBJECT;
else if (!strcmp(typestr, "DENIED_OBJECT"))
*typeval = ACCESS_DENIED_OBJECT;
else {
fprintf(stderr, "%s: Invalid type: %s\n", __func__, typestr);
return 1;
}
break;
}
return 0;
}
static uint8_t
ace_flag_value(char *flagstr, ace_kinds ace_kind)
{
uint8_t flagval = 0x0;
char *iflag;
iflag = strtok(flagstr, "|"); /* everything before | */
switch(ace_kind) {
case ACE_KIND_SACL:
while (iflag) {
if (!strcmp(iflag, "SA"))
flagval |= SUCCESSFUL_ACCESS;
else if (!strcmp(iflag, "FA"))
flagval |= FAILED_ACCESS;
else
return 0x0; /* Invalid flag */
iflag = strtok(NULL, "|"); /* everything before | */
}
break;
case ACE_KIND_DACL:
default:
while (iflag) {
if (!strcmp(iflag, "OI"))
flagval |= OBJECT_INHERIT_FLAG;
else if (!strcmp(iflag, "CI"))
flagval |= CONTAINER_INHERIT_FLAG;
else if (!strcmp(iflag, "NP"))
flagval |= NO_PROPAGATE_INHERIT_FLAG;
else if (!strcmp(iflag, "IO"))
flagval |= INHERIT_ONLY_FLAG;
else if (!strcmp(iflag, "I"))
flagval |= INHERITED_ACE_FLAG;
else
return 0x0; /* Invalid flag */
iflag = strtok(NULL, "|"); /* everything before | */
}
break;
}
return flagval;
}
static int
verify_ace_flags(char *flagstr, uint8_t *flagval, ace_kinds ace_kind)
{
char *invalflag;
uint8_t ace_flag_mask = 0;
if (!strcmp(flagstr, "0") || !strcmp(flagstr, "0x0"))
return 0;
if (strstr(flagstr, "0x")) { /* hex flag value */
*flagval = strtol(flagstr, &invalflag, 16);
if (strlen(invalflag)) {
fprintf(stderr, "%s: Invalid flags: %s\n", __func__,
flagstr);
return 1;
}
} else
*flagval = ace_flag_value(flagstr, ace_kind);
switch(ace_kind) {
case ACE_KIND_SACL:
ace_flag_mask = SACL_VFLAGS;
break;
case ACE_KIND_DACL:
default:
ace_flag_mask = DACL_VFLAGS;
break;
}
if (!*flagval || (*flagval & ~ace_flag_mask)) {
fprintf(stderr, "%s: Invalid flag %s and value: 0x%x\n",
__func__, flagstr, *flagval);
return 1;
}
return 0;
}
static uint32_t
ace_mask_value(char *mask)
{
uint32_t maskval = 0;
char cur;
if (!strcmp(mask, "FULL"))
return FULL_CONTROL;
if (!strcmp(mask, "CHANGE"))
return CHANGE;
if (!strcmp(mask, "READ"))
return EREAD;
if (!strcmp(mask, "RWXDPO"))
return ALL_ACCESS_BITS;
while((cur = *mask++)) {
switch(cur) {
case 'R':
maskval |= EREAD;
break;
case 'W':
maskval |= EWRITE;
break;
case 'X':
maskval |= EXEC;
break;
case 'D':
maskval |= DELETE;
break;
case 'P':