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samba-mirror/source3/utils/sharesec.c
Matthew DeVore c2ac923c6a s3: safe_string: do not include string_wrappers.h
Rather than have safe_string.h #include string_wrappers.h, make users of
string_wrappers.h include it explicitly.

includes.h now no longer includes string_wrappers.h transitively. Still
allow includes.h to #include safe_string.h for now so that as many
modules as possible get the safety checks in it.

Signed-off-by: Matthew DeVore <matvore@google.com>
Reviewed-by: David Mulder <dmulder@samba.org>
Reviewed-by: Jeremy Allison <jra@samba.org>
2020-08-28 00:56:34 +00:00

588 lines
14 KiB
C

/*
* Unix SMB/Netbios implementation.
* Utility for managing share permissions
*
* Copyright (C) Tim Potter 2000
* Copyright (C) Jeremy Allison 2000
* Copyright (C) Jelmer Vernooij 2003
* Copyright (C) Gerald (Jerry) Carter 2005.
*
* 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/>.
*/
struct cli_state;
#include "includes.h"
#include "popt_common.h"
#include "../libcli/security/security.h"
#include "passdb/machine_sid.h"
#include "util_sd.h"
#include "cmdline_contexts.h"
#include "lib/util/string_wrappers.h"
static TALLOC_CTX *ctx;
enum acl_mode { SMB_ACL_DELETE,
SMB_ACL_MODIFY,
SMB_ACL_ADD,
SMB_ACL_SET,
SMB_SD_DELETE,
SMB_SD_SETSDDL,
SMB_SD_VIEWSDDL,
SMB_ACL_VIEW,
SMB_ACL_VIEW_ALL };
/********************************************************************
********************************************************************/
static struct security_descriptor* parse_acl_string(TALLOC_CTX *mem_ctx, const char *szACL, size_t *sd_size )
{
struct security_descriptor *sd = NULL;
struct security_ace *ace;
struct security_acl *theacl;
int num_ace;
const char *pacl;
int i;
if ( !szACL )
return NULL;
pacl = szACL;
num_ace = count_chars( pacl, ',' ) + 1;
if ( !(ace = talloc_zero_array( mem_ctx, struct security_ace, num_ace )) )
return NULL;
for ( i=0; i<num_ace; i++ ) {
char *end_acl = strchr_m( pacl, ',' );
fstring acl_string;
strncpy( acl_string, pacl, MIN( PTR_DIFF( end_acl, pacl ), sizeof(fstring)-1) );
acl_string[MIN( PTR_DIFF( end_acl, pacl ), sizeof(fstring)-1)] = '\0';
if ( !parse_ace(NULL, &ace[i], acl_string ) )
return NULL;
pacl = end_acl;
pacl++;
}
if ( !(theacl = make_sec_acl( mem_ctx, NT4_ACL_REVISION, num_ace, ace )) )
return NULL;
sd = make_sec_desc( mem_ctx, SD_REVISION, SEC_DESC_SELF_RELATIVE,
NULL, NULL, NULL, theacl, sd_size);
return sd;
}
/* add an ACE to a list of ACEs in a struct security_acl */
static bool add_ace(TALLOC_CTX *mem_ctx, struct security_acl **the_acl, struct security_ace *ace)
{
struct security_acl *new_ace;
struct security_ace *aces;
if (! *the_acl) {
return (((*the_acl) = make_sec_acl(mem_ctx, 3, 1, ace)) != NULL);
}
if (!(aces = SMB_CALLOC_ARRAY(struct security_ace, 1+(*the_acl)->num_aces))) {
return False;
}
memcpy(aces, (*the_acl)->aces, (*the_acl)->num_aces * sizeof(struct
security_ace));
memcpy(aces+(*the_acl)->num_aces, ace, sizeof(struct security_ace));
new_ace = make_sec_acl(mem_ctx,(*the_acl)->revision,1+(*the_acl)->num_aces, aces);
SAFE_FREE(aces);
(*the_acl) = new_ace;
return True;
}
/* The MSDN is contradictory over the ordering of ACE entries in an ACL.
However NT4 gives a "The information may have been modified by a
computer running Windows NT 5.0" if denied ACEs do not appear before
allowed ACEs. */
static int ace_compare(struct security_ace *ace1, struct security_ace *ace2)
{
if (security_ace_equal(ace1, ace2))
return 0;
if (ace1->type != ace2->type)
return ace2->type - ace1->type;
if (dom_sid_compare(&ace1->trustee, &ace2->trustee))
return dom_sid_compare(&ace1->trustee, &ace2->trustee);
if (ace1->flags != ace2->flags)
return ace1->flags - ace2->flags;
if (ace1->access_mask != ace2->access_mask)
return ace1->access_mask - ace2->access_mask;
if (ace1->size != ace2->size)
return ace1->size - ace2->size;
return memcmp(ace1, ace2, sizeof(struct security_ace));
}
static void sort_acl(struct security_acl *the_acl)
{
uint32_t i;
if (!the_acl) return;
TYPESAFE_QSORT(the_acl->aces, the_acl->num_aces, ace_compare);
for (i=1;i<the_acl->num_aces;) {
if (security_ace_equal(&the_acl->aces[i-1],
&the_acl->aces[i])) {
ARRAY_DEL_ELEMENT(
the_acl->aces, i, the_acl->num_aces);
the_acl->num_aces--;
} else {
i++;
}
}
}
static int change_share_sec(TALLOC_CTX *mem_ctx, const char *sharename, char *the_acl, enum acl_mode mode)
{
struct security_descriptor *sd = NULL;
struct security_descriptor *old = NULL;
size_t sd_size = 0;
uint32_t i, j;
NTSTATUS status;
if (mode != SMB_ACL_SET && mode != SMB_SD_DELETE) {
if (!(old = get_share_security( mem_ctx, sharename, &sd_size )) ) {
fprintf(stderr, "Unable to retrieve permissions for share "
"[%s]\n", sharename);
return -1;
}
}
if ( (mode != SMB_ACL_VIEW && mode != SMB_SD_DELETE) &&
!(sd = parse_acl_string(mem_ctx, the_acl, &sd_size )) ) {
fprintf( stderr, "Failed to parse acl\n");
return -1;
}
switch (mode) {
case SMB_ACL_VIEW_ALL:
/* should not happen */
return 0;
case SMB_ACL_VIEW:
sec_desc_print(NULL, stdout, old, false);
return 0;
case SMB_ACL_DELETE:
for (i=0;sd->dacl && i<sd->dacl->num_aces;i++) {
bool found = False;
for (j=0;old->dacl && j<old->dacl->num_aces;j++) {
if (security_ace_equal(&sd->dacl->aces[i],
&old->dacl->aces[j])) {
uint32_t k;
for (k=j; k<old->dacl->num_aces-1;k++) {
old->dacl->aces[k] = old->dacl->aces[k+1];
}
old->dacl->num_aces--;
found = True;
break;
}
}
if (!found) {
printf("ACL for ACE:");
print_ace(NULL, stdout, &sd->dacl->aces[i], false);
printf(" not found\n");
}
}
break;
case SMB_ACL_MODIFY:
for (i=0;sd->dacl && i<sd->dacl->num_aces;i++) {
bool found = False;
for (j=0;old->dacl && j<old->dacl->num_aces;j++) {
if (dom_sid_equal(&sd->dacl->aces[i].trustee,
&old->dacl->aces[j].trustee)) {
old->dacl->aces[j] = sd->dacl->aces[i];
found = True;
}
}
if (!found) {
struct dom_sid_buf buf;
printf("ACL for SID %s not found\n",
dom_sid_str_buf(&sd->dacl->aces[i].trustee, &buf));
}
}
if (sd->owner_sid) {
old->owner_sid = sd->owner_sid;
}
if (sd->group_sid) {
old->group_sid = sd->group_sid;
}
break;
case SMB_ACL_ADD:
for (i=0;sd->dacl && i<sd->dacl->num_aces;i++) {
add_ace(mem_ctx, &old->dacl, &sd->dacl->aces[i]);
}
break;
case SMB_ACL_SET:
old = sd;
break;
case SMB_SD_DELETE:
status = delete_share_security(sharename);
if (!NT_STATUS_IS_OK(status)) {
fprintf( stderr, "Failed to delete security descriptor for "
"share [%s]\n", sharename );
return -1;
}
return 0;
default:
fprintf(stderr, "invalid command\n");
return -1;
}
/* Denied ACE entries must come before allowed ones */
sort_acl(old->dacl);
status = set_share_security(sharename, old);
if (!NT_STATUS_IS_OK(status)) {
fprintf( stderr, "Failed to store acl for share [%s]\n", sharename );
return 2;
}
return 0;
}
static int set_sharesec_sddl(const char *sharename, const char *sddl)
{
struct security_descriptor *sd;
NTSTATUS status;
sd = sddl_decode(talloc_tos(), sddl, get_global_sam_sid());
if (sd == NULL) {
fprintf(stderr, "Failed to parse acl\n");
return -1;
}
status = set_share_security(sharename, sd);
TALLOC_FREE(sd);
if (!NT_STATUS_IS_OK(status)) {
fprintf(stderr, "Failed to store acl for share [%s]\n",
sharename);
return -1;
}
return 0;
}
static int view_sharesec_sddl(const char *sharename)
{
struct security_descriptor *sd;
size_t sd_size;
char *acl;
sd = get_share_security(talloc_tos(), sharename, &sd_size);
if (sd == NULL) {
fprintf(stderr, "Unable to retrieve permissions for share "
"[%s]\n", sharename);
return -1;
}
acl = sddl_encode(talloc_tos(), sd, get_global_sam_sid());
TALLOC_FREE(sd);
if (acl == NULL) {
fprintf(stderr, "Unable to sddl-encode permissions for share "
"[%s]\n", sharename);
return -1;
}
printf("%s\n", acl);
TALLOC_FREE(acl);
return 0;
}
/********************************************************************
main program
********************************************************************/
enum {
OPT_VIEW_ALL = 1000,
};
int main(int argc, const char *argv[])
{
int opt;
int retval = 0;
enum acl_mode mode = SMB_ACL_SET;
static char *the_acl = NULL;
fstring sharename;
bool force_acl = False;
int snum;
poptContext pc;
bool initialize_sid = False;
struct poptOption long_options[] = {
POPT_AUTOHELP
{
.longName = "remove",
.shortName = 'r',
.argInfo = POPT_ARG_STRING,
.arg = &the_acl,
.val = 'r',
.descrip = "Remove ACEs",
.argDescrip = "ACL",
},
{
.longName = "modify",
.shortName = 'm',
.argInfo = POPT_ARG_STRING,
.arg = &the_acl,
.val = 'm',
.descrip = "Modify existing ACEs",
.argDescrip = "ACL",
},
{
.longName = "add",
.shortName = 'a',
.argInfo = POPT_ARG_STRING,
.arg = &the_acl,
.val = 'a',
.descrip = "Add ACEs",
.argDescrip = "ACL",
},
{
.longName = "replace",
.shortName = 'R',
.argInfo = POPT_ARG_STRING,
.arg = &the_acl,
.val = 'R',
.descrip = "Overwrite share permission ACL",
.argDescrip = "ACLS",
},
{
.longName = "delete",
.shortName = 'D',
.argInfo = POPT_ARG_NONE,
.arg = NULL,
.val = 'D',
.descrip = "Delete the entire security descriptor",
},
{
.longName = "setsddl",
.shortName = 'S',
.argInfo = POPT_ARG_STRING,
.arg = the_acl,
.val = 'S',
.descrip = "Set the SD in sddl format",
},
{
.longName = "viewsddl",
.shortName = 'V',
.argInfo = POPT_ARG_NONE,
.arg = the_acl,
.val = 'V',
.descrip = "View the SD in sddl format",
},
{
.longName = "view",
.shortName = 'v',
.argInfo = POPT_ARG_NONE,
.arg = NULL,
.val = 'v',
.descrip = "View current share permissions",
},
{
.longName = "view-all",
.shortName = 0,
.argInfo = POPT_ARG_NONE,
.arg = NULL,
.val = OPT_VIEW_ALL,
.descrip = "View all current share permissions",
},
{
.longName = "machine-sid",
.shortName = 'M',
.argInfo = POPT_ARG_NONE,
.arg = NULL,
.val = 'M',
.descrip = "Initialize the machine SID",
},
{
.longName = "force",
.shortName = 'F',
.argInfo = POPT_ARG_NONE,
.arg = NULL,
.val = 'F',
.descrip = "Force storing the ACL",
.argDescrip = "ACLS",
},
POPT_COMMON_SAMBA
POPT_TABLEEND
};
if ( !(ctx = talloc_stackframe()) ) {
fprintf( stderr, "Failed to initialize talloc context!\n");
return -1;
}
/* set default debug level to 1 regardless of what smb.conf sets */
setup_logging( "sharesec", DEBUG_STDERR);
smb_init_locale();
lp_set_cmdline("log level", "1");
pc = poptGetContext("sharesec", argc, argv, long_options, 0);
poptSetOtherOptionHelp(pc, "sharename\n");
while ((opt = poptGetNextOpt(pc)) != -1) {
switch (opt) {
case 'r':
the_acl = smb_xstrdup(poptGetOptArg(pc));
mode = SMB_ACL_DELETE;
break;
case 'm':
the_acl = smb_xstrdup(poptGetOptArg(pc));
mode = SMB_ACL_MODIFY;
break;
case 'a':
the_acl = smb_xstrdup(poptGetOptArg(pc));
mode = SMB_ACL_ADD;
break;
case 'R':
the_acl = smb_xstrdup(poptGetOptArg(pc));
mode = SMB_ACL_SET;
break;
case 'D':
mode = SMB_SD_DELETE;
break;
case 'S':
mode = SMB_SD_SETSDDL;
the_acl = smb_xstrdup(poptGetOptArg(pc));
break;
case 'V':
mode = SMB_SD_VIEWSDDL;
break;
case 'v':
mode = SMB_ACL_VIEW;
break;
case 'F':
force_acl = True;
break;
case 'M':
initialize_sid = True;
break;
case OPT_VIEW_ALL:
mode = SMB_ACL_VIEW_ALL;
break;
}
}
setlinebuf(stdout);
lp_load_with_registry_shares(get_dyn_CONFIGFILE());
/* check for initializing secrets.tdb first */
if ( initialize_sid ) {
struct dom_sid *sid = get_global_sam_sid();
struct dom_sid_buf buf;
if ( !sid ) {
fprintf( stderr, "Failed to retrieve Machine SID!\n");
retval = 3;
goto done;
}
printf ("%s\n", dom_sid_str_buf(sid, &buf) );
retval = 0;
goto done;
}
if ( mode == SMB_ACL_VIEW && force_acl ) {
fprintf( stderr, "Invalid combination of -F and -v\n");
retval = -1;
goto done;
}
if (mode == SMB_ACL_VIEW_ALL) {
int i;
for (i=0; i<lp_numservices(); i++) {
TALLOC_CTX *frame = talloc_stackframe();
const struct loadparm_substitution *lp_sub =
loadparm_s3_global_substitution();
const char *service = lp_servicename(frame, lp_sub, i);
if (service == NULL) {
continue;
}
printf("[%s]\n", service);
change_share_sec(frame, service, NULL, SMB_ACL_VIEW);
printf("\n");
TALLOC_FREE(frame);
}
goto done;
}
/* get the sharename */
if(!poptPeekArg(pc)) {
poptPrintUsage(pc, stderr, 0);
retval = -1;
goto done;
}
fstrcpy(sharename, poptGetArg(pc));
snum = lp_servicenumber( sharename );
if ( snum == -1 && !force_acl ) {
fprintf( stderr, "Invalid sharename: %s\n", sharename);
retval = -1;
goto done;
}
switch (mode) {
case SMB_SD_SETSDDL:
retval = set_sharesec_sddl(sharename, the_acl);
break;
case SMB_SD_VIEWSDDL:
retval = view_sharesec_sddl(sharename);
break;
default:
retval = change_share_sec(ctx, sharename, the_acl, mode);
break;
}
done:
poptFreeContext(pc);
talloc_destroy(ctx);
return retval;
}