| 1 | /*
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| 2 | * Unix SMB/Netbios implementation.
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| 3 | * SEC_ACE handling functions
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| 4 | * Copyright (C) Andrew Tridgell 1992-1998,
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| 5 | * Copyright (C) Jeremy R. Allison 1995-2003.
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| 6 | * Copyright (C) Luke Kenneth Casson Leighton 1996-1998,
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| 7 | * Copyright (C) Paul Ashton 1997-1998.
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| 8 | *
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| 9 | * This program is free software; you can redistribute it and/or modify
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| 10 | * it under the terms of the GNU General Public License as published by
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| 11 | * the Free Software Foundation; either version 2 of the License, or
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| 12 | * (at your option) any later version.
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| 13 | *
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| 14 | * This program is distributed in the hope that it will be useful,
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| 15 | * but WITHOUT ANY WARRANTY; without even the implied warranty of
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| 16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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| 17 | * GNU General Public License for more details.
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| 18 | *
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| 19 | * You should have received a copy of the GNU General Public License
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| 20 | * along with this program; if not, write to the Free Software
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| 21 | * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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| 22 | */
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| 23 |
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| 24 | #include "includes.h"
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| 25 |
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| 26 | /*******************************************************************
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| 27 | Check if ACE has OBJECT type.
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| 28 | ********************************************************************/
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| 29 |
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| 30 | BOOL sec_ace_object(uint8 type)
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| 31 | {
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| 32 | if (type == SEC_ACE_TYPE_ACCESS_ALLOWED_OBJECT ||
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| 33 | type == SEC_ACE_TYPE_ACCESS_DENIED_OBJECT ||
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| 34 | type == SEC_ACE_TYPE_SYSTEM_AUDIT_OBJECT ||
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| 35 | type == SEC_ACE_TYPE_SYSTEM_ALARM_OBJECT) {
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| 36 | return True;
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| 37 | }
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| 38 | return False;
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| 39 | }
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| 40 |
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| 41 | /*******************************************************************
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| 42 | copy a SEC_ACE structure.
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| 43 | ********************************************************************/
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| 44 | void sec_ace_copy(SEC_ACE *ace_dest, SEC_ACE *ace_src)
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| 45 | {
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| 46 | ace_dest->type = ace_src->type;
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| 47 | ace_dest->flags = ace_src->flags;
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| 48 | ace_dest->size = ace_src->size;
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| 49 | ace_dest->access_mask = ace_src->access_mask;
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| 50 | ace_dest->obj_flags = ace_src->obj_flags;
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| 51 | memcpy(&ace_dest->obj_guid, &ace_src->obj_guid, sizeof(struct GUID));
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| 52 | memcpy(&ace_dest->inh_guid, &ace_src->inh_guid, sizeof(struct GUID));
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| 53 | sid_copy(&ace_dest->trustee, &ace_src->trustee);
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| 54 | }
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| 55 |
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| 56 | /*******************************************************************
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| 57 | Sets up a SEC_ACE structure.
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| 58 | ********************************************************************/
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| 59 |
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| 60 | void init_sec_ace(SEC_ACE *t, const DOM_SID *sid, uint8 type, SEC_ACCESS mask, uint8 flag)
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| 61 | {
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| 62 | t->type = type;
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| 63 | t->flags = flag;
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| 64 | t->size = sid_size(sid) + 8;
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| 65 | t->access_mask = mask;
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| 66 |
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| 67 | ZERO_STRUCTP(&t->trustee);
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| 68 | sid_copy(&t->trustee, sid);
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| 69 | }
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| 70 |
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| 71 | /*******************************************************************
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| 72 | adds new SID with its permissions to ACE list
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| 73 | ********************************************************************/
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| 74 |
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| 75 | NTSTATUS sec_ace_add_sid(TALLOC_CTX *ctx, SEC_ACE **pp_new, SEC_ACE *old, unsigned *num, DOM_SID *sid, uint32 mask)
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| 76 | {
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| 77 | unsigned int i = 0;
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| 78 |
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| 79 | if (!ctx || !pp_new || !old || !sid || !num) return NT_STATUS_INVALID_PARAMETER;
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| 80 |
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| 81 | *num += 1;
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| 82 |
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| 83 | if((pp_new[0] = TALLOC_ZERO_ARRAY(ctx, SEC_ACE, *num )) == 0)
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| 84 | return NT_STATUS_NO_MEMORY;
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| 85 |
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| 86 | for (i = 0; i < *num - 1; i ++)
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| 87 | sec_ace_copy(&(*pp_new)[i], &old[i]);
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| 88 |
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| 89 | (*pp_new)[i].type = 0;
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| 90 | (*pp_new)[i].flags = 0;
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| 91 | (*pp_new)[i].size = SEC_ACE_HEADER_SIZE + sid_size(sid);
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| 92 | (*pp_new)[i].access_mask = mask;
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| 93 | sid_copy(&(*pp_new)[i].trustee, sid);
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| 94 | return NT_STATUS_OK;
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| 95 | }
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| 96 |
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| 97 | /*******************************************************************
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| 98 | modify SID's permissions at ACL
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| 99 | ********************************************************************/
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| 100 |
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| 101 | NTSTATUS sec_ace_mod_sid(SEC_ACE *ace, size_t num, DOM_SID *sid, uint32 mask)
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| 102 | {
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| 103 | unsigned int i = 0;
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| 104 |
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| 105 | if (!ace || !sid) return NT_STATUS_INVALID_PARAMETER;
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| 106 |
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| 107 | for (i = 0; i < num; i ++) {
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| 108 | if (sid_compare(&ace[i].trustee, sid) == 0) {
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| 109 | ace[i].access_mask = mask;
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| 110 | return NT_STATUS_OK;
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| 111 | }
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| 112 | }
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| 113 | return NT_STATUS_NOT_FOUND;
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| 114 | }
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| 115 |
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| 116 | /*******************************************************************
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| 117 | delete SID from ACL
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| 118 | ********************************************************************/
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| 119 |
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| 120 | NTSTATUS sec_ace_del_sid(TALLOC_CTX *ctx, SEC_ACE **pp_new, SEC_ACE *old, uint32 *num, DOM_SID *sid)
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| 121 | {
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| 122 | unsigned int i = 0;
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| 123 | unsigned int n_del = 0;
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| 124 |
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| 125 | if (!ctx || !pp_new || !old || !sid || !num) return NT_STATUS_INVALID_PARAMETER;
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| 126 |
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| 127 | if((pp_new[0] = TALLOC_ZERO_ARRAY(ctx, SEC_ACE, *num )) == 0)
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| 128 | return NT_STATUS_NO_MEMORY;
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| 129 |
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| 130 | for (i = 0; i < *num; i ++) {
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| 131 | if (sid_compare(&old[i].trustee, sid) != 0)
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| 132 | sec_ace_copy(&(*pp_new)[i], &old[i]);
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| 133 | else
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| 134 | n_del ++;
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| 135 | }
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| 136 | if (n_del == 0)
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| 137 | return NT_STATUS_NOT_FOUND;
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| 138 | else {
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| 139 | *num -= n_del;
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| 140 | return NT_STATUS_OK;
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| 141 | }
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| 142 | }
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| 143 |
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| 144 | /*******************************************************************
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| 145 | Compares two SEC_ACE structures
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| 146 | ********************************************************************/
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| 147 |
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| 148 | BOOL sec_ace_equal(SEC_ACE *s1, SEC_ACE *s2)
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| 149 | {
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| 150 | /* Trivial case */
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| 151 |
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| 152 | if (!s1 && !s2) {
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| 153 | return True;
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| 154 | }
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| 155 |
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| 156 | if (!s1 || !s2) {
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| 157 | return False;
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| 158 | }
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| 159 |
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| 160 | /* Check top level stuff */
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| 161 |
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| 162 | if (s1->type != s2->type || s1->flags != s2->flags ||
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| 163 | s1->access_mask != s2->access_mask) {
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| 164 | return False;
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| 165 | }
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| 166 |
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| 167 | /* Check SID */
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| 168 |
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| 169 | if (!sid_equal(&s1->trustee, &s2->trustee)) {
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| 170 | return False;
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| 171 | }
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| 172 |
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| 173 | return True;
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| 174 | }
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| 175 |
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| 176 | int nt_ace_inherit_comp( SEC_ACE *a1, SEC_ACE *a2)
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| 177 | {
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| 178 | int a1_inh = a1->flags & SEC_ACE_FLAG_INHERITED_ACE;
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| 179 | int a2_inh = a2->flags & SEC_ACE_FLAG_INHERITED_ACE;
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| 180 |
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| 181 | if (a1_inh == a2_inh)
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| 182 | return 0;
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| 183 |
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| 184 | if (!a1_inh && a2_inh)
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| 185 | return -1;
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| 186 | return 1;
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| 187 | }
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| 188 |
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| 189 | /*******************************************************************
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| 190 | Comparison function to apply the order explained below in a group.
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| 191 | *******************************************************************/
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| 192 |
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| 193 | int nt_ace_canon_comp( SEC_ACE *a1, SEC_ACE *a2)
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| 194 | {
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| 195 | if ((a1->type == SEC_ACE_TYPE_ACCESS_DENIED) &&
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| 196 | (a2->type != SEC_ACE_TYPE_ACCESS_DENIED))
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| 197 | return -1;
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| 198 |
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| 199 | if ((a2->type == SEC_ACE_TYPE_ACCESS_DENIED) &&
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| 200 | (a1->type != SEC_ACE_TYPE_ACCESS_DENIED))
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| 201 | return 1;
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| 202 |
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| 203 | /* Both access denied or access allowed. */
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| 204 |
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| 205 | /* 1. ACEs that apply to the object itself */
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| 206 |
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| 207 | if (!(a1->flags & SEC_ACE_FLAG_INHERIT_ONLY) &&
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| 208 | (a2->flags & SEC_ACE_FLAG_INHERIT_ONLY))
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| 209 | return -1;
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| 210 | else if (!(a2->flags & SEC_ACE_FLAG_INHERIT_ONLY) &&
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| 211 | (a1->flags & SEC_ACE_FLAG_INHERIT_ONLY))
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| 212 | return 1;
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| 213 |
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| 214 | /* 2. ACEs that apply to a subobject of the object, such as
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| 215 | * a property set or property. */
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| 216 |
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| 217 | if (a1->flags & (SEC_ACE_FLAG_CONTAINER_INHERIT|SEC_ACE_FLAG_OBJECT_INHERIT) &&
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| 218 | !(a2->flags & (SEC_ACE_FLAG_CONTAINER_INHERIT|SEC_ACE_FLAG_OBJECT_INHERIT)))
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| 219 | return -1;
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| 220 | else if (a2->flags & (SEC_ACE_FLAG_CONTAINER_INHERIT|SEC_ACE_FLAG_OBJECT_INHERIT) &&
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| 221 | !(a1->flags & (SEC_ACE_FLAG_CONTAINER_INHERIT|SEC_ACE_FLAG_OBJECT_INHERIT)))
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| 222 | return 1;
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| 223 |
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| 224 | return 0;
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| 225 | }
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| 226 |
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| 227 | /*******************************************************************
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| 228 | Functions to convert a SEC_DESC ACE DACL list into canonical order.
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| 229 | JRA.
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| 230 |
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| 231 | --- from http://msdn.microsoft.com/library/default.asp?url=/library/en-us/security/security/order_of_aces_in_a_dacl.asp
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| 232 |
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| 233 | The following describes the preferred order:
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| 234 |
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| 235 | To ensure that noninherited ACEs have precedence over inherited ACEs,
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| 236 | place all noninherited ACEs in a group before any inherited ACEs.
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| 237 | This ordering ensures, for example, that a noninherited access-denied ACE
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| 238 | is enforced regardless of any inherited ACE that allows access.
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| 239 |
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| 240 | Within the groups of noninherited ACEs and inherited ACEs, order ACEs according to ACE type, as the following shows:
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| 241 | 1. Access-denied ACEs that apply to the object itself
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| 242 | 2. Access-denied ACEs that apply to a subobject of the object, such as a property set or property
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| 243 | 3. Access-allowed ACEs that apply to the object itself
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| 244 | 4. Access-allowed ACEs that apply to a subobject of the object"
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| 245 |
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| 246 | ********************************************************************/
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| 247 |
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| 248 | void dacl_sort_into_canonical_order(SEC_ACE *srclist, unsigned int num_aces)
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| 249 | {
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| 250 | unsigned int i;
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| 251 |
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| 252 | if (!srclist || num_aces == 0)
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| 253 | return;
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| 254 |
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| 255 | /* Sort so that non-inherited ACE's come first. */
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| 256 | qsort( srclist, num_aces, sizeof(srclist[0]), QSORT_CAST nt_ace_inherit_comp);
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| 257 |
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| 258 | /* Find the boundary between non-inherited ACEs. */
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| 259 | for (i = 0; i < num_aces; i++ ) {
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| 260 | SEC_ACE *curr_ace = &srclist[i];
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| 261 |
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| 262 | if (curr_ace->flags & SEC_ACE_FLAG_INHERITED_ACE)
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| 263 | break;
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| 264 | }
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| 265 |
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| 266 | /* i now points at entry number of the first inherited ACE. */
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| 267 |
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| 268 | /* Sort the non-inherited ACEs. */
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| 269 | if (i)
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| 270 | qsort( srclist, i, sizeof(srclist[0]), QSORT_CAST nt_ace_canon_comp);
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| 271 |
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| 272 | /* Now sort the inherited ACEs. */
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| 273 | if (num_aces - i)
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| 274 | qsort( &srclist[i], num_aces - i, sizeof(srclist[0]), QSORT_CAST nt_ace_canon_comp);
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| 275 | }
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| 276 |
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| 277 | /*******************************************************************
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| 278 | Check if this ACE has a SID in common with the token.
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| 279 | ********************************************************************/
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| 280 |
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| 281 | BOOL token_sid_in_ace(const NT_USER_TOKEN *token, const SEC_ACE *ace)
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| 282 | {
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| 283 | size_t i;
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| 284 |
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| 285 | for (i = 0; i < token->num_sids; i++) {
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| 286 | if (sid_equal(&ace->trustee, &token->user_sids[i]))
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| 287 | return True;
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| 288 | }
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| 289 |
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| 290 | return False;
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| 291 | }
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