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* Unix SMB/Netbios implementation.
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* Utility for managing share permissions
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* Copyright (C) Tim Potter 2000
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* Copyright (C) Jeremy Allison 2000
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* Copyright (C) Jelmer Vernooij 2003
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* Copyright (C) Gerald (Jerry) Carter 2005.
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 3 of the License, or
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* (at your option) any later version.
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, see <http://www.gnu.org/licenses/>.
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static TALLOC_CTX *ctx;
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enum acl_mode { SMB_ACL_DELETE,
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/* These values discovered by inspection */
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static const struct perm_value special_values[] = {
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{ "R", SEC_RIGHTS_FILE_READ },
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{ "W", SEC_RIGHTS_FILE_WRITE },
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{ "X", SEC_RIGHTS_FILE_EXECUTE },
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{ "D", SEC_STD_DELETE },
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{ "P", SEC_STD_WRITE_DAC },
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{ "O", SEC_STD_WRITE_OWNER },
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#define SEC_RIGHTS_DIR_CHANGE ( SEC_RIGHTS_DIR_READ|SEC_STD_DELETE|\
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SEC_RIGHTS_DIR_WRITE|SEC_DIR_TRAVERSE )
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static const struct perm_value standard_values[] = {
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{ "READ", SEC_RIGHTS_DIR_READ|SEC_DIR_TRAVERSE },
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{ "CHANGE", SEC_RIGHTS_DIR_CHANGE },
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{ "FULL", SEC_RIGHTS_DIR_ALL },
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/********************************************************************
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print an ACE on a FILE
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********************************************************************/
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static void print_ace(FILE *f, SEC_ACE *ace)
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const struct perm_value *v;
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fprintf(f, "%s:", sid_string_tos(&ace->trustee));
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if (ace->type == SEC_ACE_TYPE_ACCESS_ALLOWED) {
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fprintf(f, "ALLOWED");
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} else if (ace->type == SEC_ACE_TYPE_ACCESS_DENIED) {
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fprintf(f, "%d", ace->type);
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/* Not sure what flags can be set in a file ACL */
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fprintf(f, "/%d/", ace->flags);
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/* Standard permissions */
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for (v = standard_values; v->perm; v++) {
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if (ace->access_mask == v->mask) {
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fprintf(f, "%s", v->perm);
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/* Special permissions. Print out a hex value if we have
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leftover bits in the mask. */
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got_mask = ace->access_mask;
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for (v = special_values; v->perm; v++) {
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if ((ace->access_mask & v->mask) == v->mask) {
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fprintf(f, "%s", v->perm);
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got_mask &= ~v->mask;
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fprintf(f, "0x%08x", ace->access_mask);
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/********************************************************************
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print an ascii version of a security descriptor on a FILE handle
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********************************************************************/
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static void sec_desc_print(FILE *f, SEC_DESC *sd)
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fprintf(f, "REVISION:%d\n", sd->revision);
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/* Print owner and group sid */
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fprintf(f, "OWNER:%s\n", sid_string_tos(sd->owner_sid));
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fprintf(f, "GROUP:%s\n", sid_string_tos(sd->group_sid));
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for (i = 0; sd->dacl && i < sd->dacl->num_aces; i++) {
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SEC_ACE *ace = &sd->dacl->aces[i];
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/********************************************************************
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parse an ACE in the same format as print_ace()
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********************************************************************/
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static bool parse_ace(SEC_ACE *ace, const char *orig_str)
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unsigned int atype = 0;
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unsigned int aflags = 0;
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unsigned int amask = 0;
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const struct perm_value *v;
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char *str = SMB_STRDUP(orig_str);
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TALLOC_CTX *frame = talloc_stackframe();
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p = strchr_m(str,':');
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fprintf(stderr, "ACE '%s': missing ':'.\n", orig_str);
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/* Try to parse numeric form */
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if (sscanf(p, "%i/%i/%i", &atype, &aflags, &amask) == 3 &&
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string_to_sid(&sid, str)) {
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/* Try to parse text form */
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if (!string_to_sid(&sid, str)) {
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fprintf(stderr, "ACE '%s': failed to convert '%s' to SID\n",
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if (!next_token_talloc(frame, &cp, &tok, "/")) {
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fprintf(stderr, "ACE '%s': failed to find '/' character.\n",
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if (strncmp(tok, "ALLOWED", strlen("ALLOWED")) == 0) {
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atype = SEC_ACE_TYPE_ACCESS_ALLOWED;
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} else if (strncmp(tok, "DENIED", strlen("DENIED")) == 0) {
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atype = SEC_ACE_TYPE_ACCESS_DENIED;
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fprintf(stderr, "ACE '%s': missing 'ALLOWED' or 'DENIED' "
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"entry at '%s'\n", orig_str, tok);
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/* Only numeric form accepted for flags at present */
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/* no flags on share permissions */
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if (!(next_token_talloc(frame, &cp, &tok, "/") &&
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sscanf(tok, "%i", &aflags) && aflags == 0)) {
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fprintf(stderr, "ACE '%s': bad integer flags entry at '%s'\n",
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if (!next_token_talloc(frame, &cp, &tok, "/")) {
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fprintf(stderr, "ACE '%s': missing / at '%s'\n",
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if (strncmp(tok, "0x", 2) == 0) {
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if (sscanf(tok, "%i", &amask) != 1) {
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fprintf(stderr, "ACE '%s': bad hex number at '%s'\n",
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for (v = standard_values; v->perm; v++) {
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if (strcmp(tok, v->perm) == 0) {
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for (v = special_values; v->perm; v++) {
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if (v->perm[0] == *p) {
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fprintf(stderr, "ACE '%s': bad permission value at "
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"'%s'\n", orig_str, p);
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init_sec_ace(ace, &sid, atype, mask, aflags);
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/********************************************************************
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********************************************************************/
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static SEC_DESC* parse_acl_string(TALLOC_CTX *mem_ctx, const char *szACL, size_t *sd_size )
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num_ace = count_chars( pacl, ',' ) + 1;
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if ( !(ace = TALLOC_ZERO_ARRAY( mem_ctx, SEC_ACE, num_ace )) )
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for ( i=0; i<num_ace; i++ ) {
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char *end_acl = strchr_m( pacl, ',' );
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strncpy( acl_string, pacl, MIN( PTR_DIFF( end_acl, pacl ), sizeof(fstring)-1) );
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acl_string[MIN( PTR_DIFF( end_acl, pacl ), sizeof(fstring)-1)] = '\0';
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if ( !parse_ace( &ace[i], acl_string ) )
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if ( !(theacl = make_sec_acl( mem_ctx, NT4_ACL_REVISION, num_ace, ace )) )
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sd = make_sec_desc( mem_ctx, SEC_DESC_REVISION, SEC_DESC_SELF_RELATIVE,
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NULL, NULL, NULL, theacl, sd_size);
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/* add an ACE to a list of ACEs in a SEC_ACL */
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static bool add_ace(TALLOC_CTX *mem_ctx, SEC_ACL **the_acl, SEC_ACE *ace)
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return (((*the_acl) = make_sec_acl(mem_ctx, 3, 1, ace)) != NULL);
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if (!(aces = SMB_CALLOC_ARRAY(SEC_ACE, 1+(*the_acl)->num_aces))) {
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memcpy(aces, (*the_acl)->aces, (*the_acl)->num_aces * sizeof(SEC_ACE));
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memcpy(aces+(*the_acl)->num_aces, ace, sizeof(SEC_ACE));
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new_ace = make_sec_acl(mem_ctx,(*the_acl)->revision,1+(*the_acl)->num_aces, aces);
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(*the_acl) = new_ace;
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/* The MSDN is contradictory over the ordering of ACE entries in an ACL.
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However NT4 gives a "The information may have been modified by a
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computer running Windows NT 5.0" if denied ACEs do not appear before
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static int ace_compare(SEC_ACE *ace1, SEC_ACE *ace2)
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if (sec_ace_equal(ace1, ace2))
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if (ace1->type != ace2->type)
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return ace2->type - ace1->type;
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if (sid_compare(&ace1->trustee, &ace2->trustee))
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return sid_compare(&ace1->trustee, &ace2->trustee);
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if (ace1->flags != ace2->flags)
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return ace1->flags - ace2->flags;
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if (ace1->access_mask != ace2->access_mask)
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return ace1->access_mask - ace2->access_mask;
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if (ace1->size != ace2->size)
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return ace1->size - ace2->size;
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return memcmp(ace1, ace2, sizeof(SEC_ACE));
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static void sort_acl(SEC_ACL *the_acl)
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if (!the_acl) return;
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qsort(the_acl->aces, the_acl->num_aces, sizeof(the_acl->aces[0]), QSORT_CAST ace_compare);
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for (i=1;i<the_acl->num_aces;) {
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if (sec_ace_equal(&the_acl->aces[i-1], &the_acl->aces[i])) {
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for (j=i; j<the_acl->num_aces-1; j++) {
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the_acl->aces[j] = the_acl->aces[j+1];
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static int change_share_sec(TALLOC_CTX *mem_ctx, const char *sharename, char *the_acl, enum acl_mode mode)
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SEC_DESC *old = NULL;
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if (mode != SMB_ACL_SET && mode != SMB_SD_DELETE) {
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if (!(old = get_share_security( mem_ctx, sharename, &sd_size )) ) {
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fprintf(stderr, "Unable to retrieve permissions for share "
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"[%s]\n", sharename);
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if ( (mode != SMB_ACL_VIEW && mode != SMB_SD_DELETE) &&
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!(sd = parse_acl_string(mem_ctx, the_acl, &sd_size )) ) {
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fprintf( stderr, "Failed to parse acl\n");
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sec_desc_print( stdout, old);
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for (i=0;sd->dacl && i<sd->dacl->num_aces;i++) {
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for (j=0;old->dacl && j<old->dacl->num_aces;j++) {
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if (sec_ace_equal(&sd->dacl->aces[i], &old->dacl->aces[j])) {
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for (k=j; k<old->dacl->num_aces-1;k++) {
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old->dacl->aces[k] = old->dacl->aces[k+1];
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old->dacl->num_aces--;
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printf("ACL for ACE:");
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print_ace(stdout, &sd->dacl->aces[i]);
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printf(" not found\n");
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for (i=0;sd->dacl && i<sd->dacl->num_aces;i++) {
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for (j=0;old->dacl && j<old->dacl->num_aces;j++) {
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if (sid_equal(&sd->dacl->aces[i].trustee,
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&old->dacl->aces[j].trustee)) {
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old->dacl->aces[j] = sd->dacl->aces[i];
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printf("ACL for SID %s not found\n",
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sid_string_tos(&sd->dacl->aces[i].trustee));
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old->owner_sid = sd->owner_sid;
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old->group_sid = sd->group_sid;
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for (i=0;sd->dacl && i<sd->dacl->num_aces;i++) {
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add_ace(mem_ctx, &old->dacl, &sd->dacl->aces[i]);
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if (!delete_share_security(sharename)) {
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fprintf( stderr, "Failed to delete security descriptor for "
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"share [%s]\n", sharename );
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/* Denied ACE entries must come before allowed ones */
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if ( !set_share_security( sharename, old ) ) {
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fprintf( stderr, "Failed to store acl for share [%s]\n", sharename );
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/********************************************************************
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********************************************************************/
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int main(int argc, const char *argv[])
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enum acl_mode mode = SMB_ACL_SET;
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static char *the_acl = NULL;
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bool force_acl = False;
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bool initialize_sid = False;
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struct poptOption long_options[] = {
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{ "remove", 'r', POPT_ARG_STRING, &the_acl, 'r', "Remove ACEs", "ACL" },
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{ "modify", 'm', POPT_ARG_STRING, &the_acl, 'm', "Modify existing ACEs", "ACL" },
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{ "add", 'a', POPT_ARG_STRING, &the_acl, 'a', "Add ACEs", "ACL" },
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{ "replace", 'R', POPT_ARG_STRING, &the_acl, 'R', "Overwrite share permission ACL", "ACLS" },
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{ "delete", 'D', POPT_ARG_NONE, NULL, 'D', "Delete the entire security descriptor" },
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{ "view", 'v', POPT_ARG_NONE, NULL, 'v', "View current share permissions" },
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{ "machine-sid", 'M', POPT_ARG_NONE, NULL, 'M', "Initialize the machine SID" },
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{ "force", 'F', POPT_ARG_NONE, NULL, 'F', "Force storing the ACL", "ACLS" },
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if ( !(ctx = talloc_stackframe()) ) {
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fprintf( stderr, "Failed to initialize talloc context!\n");
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/* set default debug level to 1 regardless of what smb.conf sets */
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setup_logging( "sharesec", True );
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DEBUGLEVEL_CLASS[DBGC_ALL] = 1;
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x_setbuf( x_stderr, NULL );
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pc = poptGetContext("sharesec", argc, argv, long_options, 0);
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poptSetOtherOptionHelp(pc, "sharename\n");
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while ((opt = poptGetNextOpt(pc)) != -1) {
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the_acl = smb_xstrdup(poptGetOptArg(pc));
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mode = SMB_ACL_DELETE;
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the_acl = smb_xstrdup(poptGetOptArg(pc));
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mode = SMB_ACL_MODIFY;
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the_acl = smb_xstrdup(poptGetOptArg(pc));
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the_acl = smb_xstrdup(poptGetOptArg(pc));
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mode = SMB_SD_DELETE;
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initialize_sid = True;
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lp_load( get_dyn_CONFIGFILE(), False, False, False, True );
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/* check for initializing secrets.tdb first */
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if ( initialize_sid ) {
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DOM_SID *sid = get_global_sam_sid();
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fprintf( stderr, "Failed to retrieve Machine SID!\n");
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printf ("%s\n", sid_string_tos( sid ) );
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if ( mode == SMB_ACL_VIEW && force_acl ) {
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fprintf( stderr, "Invalid combination of -F and -v\n");
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/* get the sharename */
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if(!poptPeekArg(pc)) {
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poptPrintUsage(pc, stderr, 0);
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fstrcpy(sharename, poptGetArg(pc));
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snum = lp_servicenumber( sharename );
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if ( snum == -1 && !force_acl ) {
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fprintf( stderr, "Invalid sharename: %s\n", sharename);
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retval = change_share_sec(ctx, sharename, the_acl, mode);