2 Unix SMB/CIFS implementation.
4 security descriptor description language functions
6 Copyright (C) Andrew Tridgell 2005
8 This program is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 3 of the License, or
11 (at your option) any later version.
13 This program is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
18 You should have received a copy of the GNU General Public License
19 along with this program. If not, see <http://www.gnu.org/licenses/>.
23 #include "libcli/security/security.h"
24 #include "librpc/gen_ndr/ndr_misc.h"
25 #include "system/locale.h"
33 map a series of letter codes into a uint32_t
35 static bool sddl_map_flags(const struct flag_map *map, const char *str,
36 uint32_t *flags, size_t *len)
38 const char *str0 = str;
41 while (str[0] && isupper(str[0])) {
43 for (i=0;map[i].name;i++) {
44 size_t l = strlen(map[i].name);
45 if (strncmp(map[i].name, str, l) == 0) {
46 *flags |= map[i].flag;
52 if (map[i].name == NULL) {
53 DEBUG(1, ("Unknown flag - %s in %s\n", str, str0));
61 a mapping between the 2 letter SID codes and sid strings
68 { "AO", SID_BUILTIN_ACCOUNT_OPERATORS },
69 { "BA", SID_BUILTIN_ADMINISTRATORS },
70 { "RU", SID_BUILTIN_PREW2K },
71 { "PO", SID_BUILTIN_PRINT_OPERATORS },
72 { "RS", SID_BUILTIN_RAS_SERVERS },
74 { "AU", SID_NT_AUTHENTICATED_USERS },
75 { "SY", SID_NT_SYSTEM },
76 { "PS", SID_NT_SELF },
78 { "ED", SID_NT_ENTERPRISE_DCS },
80 { "CO", SID_CREATOR_OWNER },
81 { "CG", SID_CREATOR_GROUP },
83 { "DA", NULL, DOMAIN_RID_ADMINS },
84 { "EA", NULL, DOMAIN_RID_ENTERPRISE_ADMINS },
85 { "DD", NULL, DOMAIN_RID_DCS },
86 { "DU", NULL, DOMAIN_RID_USERS },
87 { "CA", NULL, DOMAIN_RID_CERT_ADMINS },
92 It can either be a special 2 letter code, or in S-* format
94 static struct dom_sid *sddl_decode_sid(TALLOC_CTX *mem_ctx, const char **sddlp,
95 const struct dom_sid *domain_sid)
97 const char *sddl = (*sddlp);
100 /* see if its in the numeric format */
101 if (strncmp(sddl, "S-", 2) == 0) {
104 size_t len = strspn(sddl+2, "-0123456789");
105 sid_str = talloc_strndup(mem_ctx, sddl, len+2);
110 sid = dom_sid_parse_talloc(mem_ctx, sid_str);
111 talloc_free(sid_str);
115 /* now check for one of the special codes */
116 for (i=0;i<ARRAY_SIZE(sid_codes);i++) {
117 if (strncmp(sid_codes[i].code, sddl, 2) == 0) break;
119 if (i == ARRAY_SIZE(sid_codes)) {
120 DEBUG(1,("Unknown sddl sid code '%2.2s'\n", sddl));
126 if (sid_codes[i].sid == NULL) {
127 return dom_sid_add_rid(mem_ctx, domain_sid, sid_codes[i].rid);
130 return dom_sid_parse_talloc(mem_ctx, sid_codes[i].sid);
133 static const struct flag_map ace_types[] = {
134 { "AU", SEC_ACE_TYPE_SYSTEM_AUDIT },
135 { "AL", SEC_ACE_TYPE_SYSTEM_ALARM },
136 { "OA", SEC_ACE_TYPE_ACCESS_ALLOWED_OBJECT },
137 { "OD", SEC_ACE_TYPE_ACCESS_DENIED_OBJECT },
138 { "OU", SEC_ACE_TYPE_SYSTEM_AUDIT_OBJECT },
139 { "OL", SEC_ACE_TYPE_SYSTEM_ALARM_OBJECT },
140 { "A", SEC_ACE_TYPE_ACCESS_ALLOWED },
141 { "D", SEC_ACE_TYPE_ACCESS_DENIED },
145 static const struct flag_map ace_flags[] = {
146 { "OI", SEC_ACE_FLAG_OBJECT_INHERIT },
147 { "CI", SEC_ACE_FLAG_CONTAINER_INHERIT },
148 { "NP", SEC_ACE_FLAG_NO_PROPAGATE_INHERIT },
149 { "IO", SEC_ACE_FLAG_INHERIT_ONLY },
150 { "ID", SEC_ACE_FLAG_INHERITED_ACE },
151 { "SA", SEC_ACE_FLAG_SUCCESSFUL_ACCESS },
152 { "FA", SEC_ACE_FLAG_FAILED_ACCESS },
156 static const struct flag_map ace_access_mask[] = {
157 { "RP", SEC_ADS_READ_PROP },
158 { "WP", SEC_ADS_WRITE_PROP },
159 { "CR", SEC_ADS_CONTROL_ACCESS },
160 { "CC", SEC_ADS_CREATE_CHILD },
161 { "DC", SEC_ADS_DELETE_CHILD },
162 { "LC", SEC_ADS_LIST },
163 { "LO", SEC_ADS_LIST_OBJECT },
164 { "RC", SEC_STD_READ_CONTROL },
165 { "WO", SEC_STD_WRITE_OWNER },
166 { "WD", SEC_STD_WRITE_DAC },
167 { "SD", SEC_STD_DELETE },
168 { "DT", SEC_ADS_DELETE_TREE },
169 { "SW", SEC_ADS_SELF_WRITE },
170 { "GA", SEC_GENERIC_ALL },
171 { "GR", SEC_GENERIC_READ },
172 { "GW", SEC_GENERIC_WRITE },
173 { "GX", SEC_GENERIC_EXECUTE },
179 return true on success, false on failure
180 note that this routine modifies the string
182 static bool sddl_decode_ace(TALLOC_CTX *mem_ctx, struct security_ace *ace, char *str,
183 const struct dom_sid *domain_sid)
193 /* parse out the 6 tokens */
196 char *ptr = strchr(str, ';');
197 if (ptr == NULL) return false;
204 if (!sddl_map_flags(ace_types, tok[0], &v, NULL)) {
210 if (!sddl_map_flags(ace_flags, tok[1], &v, NULL)) {
216 if (strncmp(tok[2], "0x", 2) == 0) {
217 ace->access_mask = strtol(tok[2], NULL, 16);
219 if (!sddl_map_flags(ace_access_mask, tok[2], &v, NULL)) {
222 ace->access_mask = v;
226 if (tok[3][0] != 0) {
227 NTSTATUS status = GUID_from_string(tok[3],
228 &ace->object.object.type.type);
229 if (!NT_STATUS_IS_OK(status)) {
232 ace->object.object.flags |= SEC_ACE_OBJECT_TYPE_PRESENT;
236 if (tok[4][0] != 0) {
237 NTSTATUS status = GUID_from_string(tok[4],
238 &ace->object.object.inherited_type.inherited_type);
239 if (!NT_STATUS_IS_OK(status)) {
242 ace->object.object.flags |= SEC_ACE_INHERITED_OBJECT_TYPE_PRESENT;
247 sid = sddl_decode_sid(mem_ctx, &s, domain_sid);
257 static const struct flag_map acl_flags[] = {
258 { "P", SEC_DESC_DACL_PROTECTED },
259 { "AR", SEC_DESC_DACL_AUTO_INHERIT_REQ },
260 { "AI", SEC_DESC_DACL_AUTO_INHERITED },
267 static struct security_acl *sddl_decode_acl(struct security_descriptor *sd,
268 const char **sddlp, uint32_t *flags,
269 const struct dom_sid *domain_sid)
271 const char *sddl = *sddlp;
272 struct security_acl *acl;
277 acl = talloc_zero(sd, struct security_acl);
278 if (acl == NULL) return NULL;
279 acl->revision = SECURITY_ACL_REVISION_NT4;
281 if (isupper(sddl[0]) && sddl[1] == ':') {
282 /* its an empty ACL */
286 /* work out the ACL flags */
287 if (!sddl_map_flags(acl_flags, sddl, flags, &len)) {
294 while (*sddl == '(') {
296 len = strcspn(sddl+1, ")");
297 astr = talloc_strndup(acl, sddl+1, len);
298 if (astr == NULL || sddl[len+1] != ')') {
302 acl->aces = talloc_realloc(acl, acl->aces, struct security_ace,
304 if (acl->aces == NULL) {
308 if (!sddl_decode_ace(acl->aces, &acl->aces[acl->num_aces],
313 switch (acl->aces[acl->num_aces].type) {
314 case SEC_ACE_TYPE_ACCESS_ALLOWED_OBJECT:
315 case SEC_ACE_TYPE_ACCESS_DENIED_OBJECT:
316 case SEC_ACE_TYPE_SYSTEM_AUDIT_OBJECT:
317 case SEC_ACE_TYPE_SYSTEM_ALARM_OBJECT:
318 acl->revision = SECURITY_ACL_REVISION_ADS;
333 decode a security descriptor in SDDL format
335 struct security_descriptor *sddl_decode(TALLOC_CTX *mem_ctx, const char *sddl,
336 const struct dom_sid *domain_sid)
338 struct security_descriptor *sd;
339 sd = talloc_zero(mem_ctx, struct security_descriptor);
341 sd->revision = SECURITY_DESCRIPTOR_REVISION_1;
342 sd->type = SEC_DESC_SELF_RELATIVE;
347 if (sddl[1] != ':') goto failed;
352 if (sd->dacl != NULL) goto failed;
353 sd->dacl = sddl_decode_acl(sd, &sddl, &flags, domain_sid);
354 if (sd->dacl == NULL) goto failed;
355 sd->type |= flags | SEC_DESC_DACL_PRESENT;
358 if (sd->sacl != NULL) goto failed;
359 sd->sacl = sddl_decode_acl(sd, &sddl, &flags, domain_sid);
360 if (sd->sacl == NULL) goto failed;
361 /* this relies on the SEC_DESC_SACL_* flags being
362 1 bit shifted from the SEC_DESC_DACL_* flags */
363 sd->type |= (flags<<1) | SEC_DESC_SACL_PRESENT;
366 if (sd->owner_sid != NULL) goto failed;
367 sd->owner_sid = sddl_decode_sid(sd, &sddl, domain_sid);
368 if (sd->owner_sid == NULL) goto failed;
371 if (sd->group_sid != NULL) goto failed;
372 sd->group_sid = sddl_decode_sid(sd, &sddl, domain_sid);
373 if (sd->group_sid == NULL) goto failed;
381 DEBUG(2,("Badly formatted SDDL '%s'\n", sddl));
387 turn a set of flags into a string
389 static char *sddl_flags_to_string(TALLOC_CTX *mem_ctx, const struct flag_map *map,
390 uint32_t flags, bool check_all)
395 /* try to find an exact match */
396 for (i=0;map[i].name;i++) {
397 if (map[i].flag == flags) {
398 return talloc_strdup(mem_ctx, map[i].name);
402 s = talloc_strdup(mem_ctx, "");
405 for (i=0;map[i].name;i++) {
406 if ((flags & map[i].flag) != 0) {
407 s = talloc_asprintf_append_buffer(s, "%s", map[i].name);
408 if (s == NULL) goto failed;
409 flags &= ~map[i].flag;
413 if (check_all && flags != 0) {
425 encode a sid in SDDL format
427 static char *sddl_encode_sid(TALLOC_CTX *mem_ctx, const struct dom_sid *sid,
428 const struct dom_sid *domain_sid)
433 sidstr = dom_sid_string(mem_ctx, sid);
434 if (sidstr == NULL) return NULL;
436 /* seen if its a well known sid */
437 for (i=0;sid_codes[i].sid;i++) {
438 if (strcmp(sidstr, sid_codes[i].sid) == 0) {
440 return talloc_strdup(mem_ctx, sid_codes[i].code);
444 /* or a well known rid in our domain */
445 if (dom_sid_in_domain(domain_sid, sid)) {
446 uint32_t rid = sid->sub_auths[sid->num_auths-1];
447 for (;i<ARRAY_SIZE(sid_codes);i++) {
448 if (rid == sid_codes[i].rid) {
450 return talloc_strdup(mem_ctx, sid_codes[i].code);
457 /* TODO: encode well known sids as two letter codes */
458 return dom_sid_string(mem_ctx, sid);
463 encode an ACE in SDDL format
465 static char *sddl_encode_ace(TALLOC_CTX *mem_ctx, const struct security_ace *ace,
466 const struct dom_sid *domain_sid)
470 const char *s_type="", *s_flags="", *s_mask="",
471 *s_object="", *s_iobject="", *s_trustee="";
473 tmp_ctx = talloc_new(mem_ctx);
474 if (tmp_ctx == NULL) {
475 DEBUG(0, ("talloc_new failed\n"));
479 s_type = sddl_flags_to_string(tmp_ctx, ace_types, ace->type, true);
480 if (s_type == NULL) goto failed;
482 s_flags = sddl_flags_to_string(tmp_ctx, ace_flags, ace->flags, true);
483 if (s_flags == NULL) goto failed;
485 s_mask = sddl_flags_to_string(tmp_ctx, ace_access_mask, ace->access_mask, true);
486 if (s_mask == NULL) {
487 s_mask = talloc_asprintf(tmp_ctx, "0x%08x", ace->access_mask);
488 if (s_mask == NULL) goto failed;
491 if (ace->type == SEC_ACE_TYPE_ACCESS_ALLOWED_OBJECT ||
492 ace->type == SEC_ACE_TYPE_ACCESS_DENIED_OBJECT ||
493 ace->type == SEC_ACE_TYPE_SYSTEM_AUDIT_OBJECT ||
494 ace->type == SEC_ACE_TYPE_SYSTEM_AUDIT_OBJECT) {
495 if (ace->object.object.flags & SEC_ACE_OBJECT_TYPE_PRESENT) {
496 s_object = GUID_string(tmp_ctx, &ace->object.object.type.type);
497 if (s_object == NULL) goto failed;
500 if (ace->object.object.flags & SEC_ACE_INHERITED_OBJECT_TYPE_PRESENT) {
501 s_iobject = GUID_string(tmp_ctx, &ace->object.object.inherited_type.inherited_type);
502 if (s_iobject == NULL) goto failed;
506 s_trustee = sddl_encode_sid(tmp_ctx, &ace->trustee, domain_sid);
507 if (s_trustee == NULL) goto failed;
509 sddl = talloc_asprintf(mem_ctx, "%s;%s;%s;%s;%s;%s",
510 s_type, s_flags, s_mask, s_object, s_iobject, s_trustee);
513 talloc_free(tmp_ctx);
518 encode an ACL in SDDL format
520 static char *sddl_encode_acl(TALLOC_CTX *mem_ctx, const struct security_acl *acl,
521 uint32_t flags, const struct dom_sid *domain_sid)
526 /* add any ACL flags */
527 sddl = sddl_flags_to_string(mem_ctx, acl_flags, flags, false);
528 if (sddl == NULL) goto failed;
530 /* now the ACEs, encoded in braces */
531 for (i=0;i<acl->num_aces;i++) {
532 char *ace = sddl_encode_ace(sddl, &acl->aces[i], domain_sid);
533 if (ace == NULL) goto failed;
534 sddl = talloc_asprintf_append_buffer(sddl, "(%s)", ace);
535 if (sddl == NULL) goto failed;
548 encode a security descriptor to SDDL format
550 char *sddl_encode(TALLOC_CTX *mem_ctx, const struct security_descriptor *sd,
551 const struct dom_sid *domain_sid)
556 /* start with a blank string */
557 sddl = talloc_strdup(mem_ctx, "");
558 if (sddl == NULL) goto failed;
560 tmp_ctx = talloc_new(mem_ctx);
562 if (sd->owner_sid != NULL) {
563 char *sid = sddl_encode_sid(tmp_ctx, sd->owner_sid, domain_sid);
564 if (sid == NULL) goto failed;
565 sddl = talloc_asprintf_append_buffer(sddl, "O:%s", sid);
566 if (sddl == NULL) goto failed;
569 if (sd->group_sid != NULL) {
570 char *sid = sddl_encode_sid(tmp_ctx, sd->group_sid, domain_sid);
571 if (sid == NULL) goto failed;
572 sddl = talloc_asprintf_append_buffer(sddl, "G:%s", sid);
573 if (sddl == NULL) goto failed;
576 if ((sd->type & SEC_DESC_DACL_PRESENT) && sd->dacl != NULL) {
577 char *acl = sddl_encode_acl(tmp_ctx, sd->dacl, sd->type, domain_sid);
578 if (acl == NULL) goto failed;
579 sddl = talloc_asprintf_append_buffer(sddl, "D:%s", acl);
580 if (sddl == NULL) goto failed;
583 if ((sd->type & SEC_DESC_SACL_PRESENT) && sd->sacl != NULL) {
584 char *acl = sddl_encode_acl(tmp_ctx, sd->sacl, sd->type>>1, domain_sid);
585 if (acl == NULL) goto failed;
586 sddl = talloc_asprintf_append_buffer(sddl, "S:%s", acl);
587 if (sddl == NULL) goto failed;
590 talloc_free(tmp_ctx);