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/*
Unix SMB/CIFS implementation.
security descriptor description language functions
Copyright (C) Andrew Tridgell 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/>.
*/
#include "includes.h"
#include "libcli/security/security.h"
#include "librpc/gen_ndr/ndr_misc.h"
#include "system/locale.h"
struct flag_map {
const char *name;
uint32_t flag;
};
/*
map a series of letter codes into a uint32_t
*/
static BOOL sddl_map_flags(const struct flag_map *map, const char *str,
uint32_t *flags, size_t *len)
{
const char *str0 = str;
if (len) *len = 0;
*flags = 0;
while (str[0] && isupper(str[0])) {
int i;
for (i=0;map[i].name;i++) {
size_t l = strlen(map[i].name);
if (strncmp(map[i].name, str, l) == 0) {
*flags |= map[i].flag;
str += l;
if (len) *len += l;
break;
}
}
if (map[i].name == NULL) {
DEBUG(1, ("Unknown flag - %s in %s\n", str, str0));
return False;
}
}
return True;
}
/*
a mapping between the 2 letter SID codes and sid strings
*/
static const struct {
const char *code;
const char *sid;
uint32_t rid;
} sid_codes[] = {
{ "AO", SID_BUILTIN_ACCOUNT_OPERATORS },
{ "BA", SID_BUILTIN_ADMINISTRATORS },
{ "RU", SID_BUILTIN_PREW2K },
{ "PO", SID_BUILTIN_PRINT_OPERATORS },
{ "RS", SID_BUILTIN_RAS_SERVERS },
{ "AU", SID_NT_AUTHENTICATED_USERS },
{ "SY", SID_NT_SYSTEM },
{ "PS", SID_NT_SELF },
{ "WD", SID_WORLD },
{ "ED", SID_NT_ENTERPRISE_DCS },
{ "CO", SID_CREATOR_OWNER },
{ "CG", SID_CREATOR_GROUP },
{ "DA", NULL, DOMAIN_RID_ADMINS },
{ "EA", NULL, DOMAIN_RID_ENTERPRISE_ADMINS },
{ "DD", NULL, DOMAIN_RID_DCS },
{ "DU", NULL, DOMAIN_RID_USERS },
{ "CA", NULL, DOMAIN_RID_CERT_ADMINS },
};
/*
decode a SID
It can either be a special 2 letter code, or in S-* format
*/
static struct dom_sid *sddl_decode_sid(TALLOC_CTX *mem_ctx, const char **sddlp,
const struct dom_sid *domain_sid)
{
const char *sddl = (*sddlp);
int i;
/* see if its in the numeric format */
if (strncmp(sddl, "S-", 2) == 0) {
struct dom_sid *sid;
char *sid_str;
size_t len = strspn(sddl+2, "-0123456789");
sid_str = talloc_strndup(mem_ctx, sddl, len+2);
if (!sid_str) {
return NULL;
}
(*sddlp) += len+2;
sid = dom_sid_parse_talloc(mem_ctx, sid_str);
talloc_free(sid_str);
return sid;
}
/* now check for one of the special codes */
for (i=0;i<ARRAY_SIZE(sid_codes);i++) {
if (strncmp(sid_codes[i].code, sddl, 2) == 0) break;
}
if (i == ARRAY_SIZE(sid_codes)) {
DEBUG(1,("Unknown sddl sid code '%2.2s'\n", sddl));
return NULL;
}
(*sddlp) += 2;
if (sid_codes[i].sid == NULL) {
return dom_sid_add_rid(mem_ctx, domain_sid, sid_codes[i].rid);
}
return dom_sid_parse_talloc(mem_ctx, sid_codes[i].sid);
}
static const struct flag_map ace_types[] = {
{ "AU", SEC_ACE_TYPE_SYSTEM_AUDIT },
{ "AL", SEC_ACE_TYPE_SYSTEM_ALARM },
{ "OA", SEC_ACE_TYPE_ACCESS_ALLOWED_OBJECT },
{ "OD", SEC_ACE_TYPE_ACCESS_DENIED_OBJECT },
{ "OU", SEC_ACE_TYPE_SYSTEM_AUDIT_OBJECT },
{ "OL", SEC_ACE_TYPE_SYSTEM_ALARM_OBJECT },
{ "A", SEC_ACE_TYPE_ACCESS_ALLOWED },
{ "D", SEC_ACE_TYPE_ACCESS_DENIED },
{ NULL, 0 }
};
static const struct flag_map ace_flags[] = {
{ "OI", SEC_ACE_FLAG_OBJECT_INHERIT },
{ "CI", SEC_ACE_FLAG_CONTAINER_INHERIT },
{ "NP", SEC_ACE_FLAG_NO_PROPAGATE_INHERIT },
{ "IO", SEC_ACE_FLAG_INHERIT_ONLY },
{ "ID", SEC_ACE_FLAG_INHERITED_ACE },
{ "SA", SEC_ACE_FLAG_SUCCESSFUL_ACCESS },
{ "FA", SEC_ACE_FLAG_FAILED_ACCESS },
{ NULL, 0 },
};
static const struct flag_map ace_access_mask[] = {
{ "RP", SEC_ADS_READ_PROP },
{ "WP", SEC_ADS_WRITE_PROP },
{ "CR", SEC_ADS_CONTROL_ACCESS },
{ "CC", SEC_ADS_CREATE_CHILD },
{ "DC", SEC_ADS_DELETE_CHILD },
{ "LC", SEC_ADS_LIST },
{ "LO", SEC_ADS_LIST_OBJECT },
{ "RC", SEC_STD_READ_CONTROL },
{ "WO", SEC_STD_WRITE_OWNER },
{ "WD", SEC_STD_WRITE_DAC },
{ "SD", SEC_STD_DELETE },
{ "DT", SEC_ADS_DELETE_TREE },
{ "SW", SEC_ADS_SELF_WRITE },
{ "GA", SEC_GENERIC_ALL },
{ "GR", SEC_GENERIC_READ },
{ "GW", SEC_GENERIC_WRITE },
{ "GX", SEC_GENERIC_EXECUTE },
{ NULL, 0 }
};
/*
decode an ACE
return True on success, False on failure
note that this routine modifies the string
*/
static BOOL sddl_decode_ace(TALLOC_CTX *mem_ctx, struct security_ace *ace, char *str,
const struct dom_sid *domain_sid)
{
const char *tok[6];
const char *s;
int i;
uint32_t v;
struct dom_sid *sid;
ZERO_STRUCTP(ace);
/* parse out the 6 tokens */
tok[0] = str;
for (i=0;i<5;i++) {
char *ptr = strchr(str, ';');
if (ptr == NULL) return False;
*ptr = 0;
str = ptr+1;
tok[i+1] = str;
}
/* parse ace type */
if (!sddl_map_flags(ace_types, tok[0], &v, NULL)) {
return False;
}
ace->type = v;
/* ace flags */
if (!sddl_map_flags(ace_flags, tok[1], &v, NULL)) {
return False;
}
ace->flags = v;
/* access mask */
if (strncmp(tok[2], "0x", 2) == 0) {
ace->access_mask = strtol(tok[2], NULL, 16);
} else {
if (!sddl_map_flags(ace_access_mask, tok[2], &v, NULL)) {
return False;
}
ace->access_mask = v;
}
/* object */
if (tok[3][0] != 0) {
NTSTATUS status = GUID_from_string(tok[3],
&ace->object.object.type.type);
if (!NT_STATUS_IS_OK(status)) {
return False;
}
ace->object.object.flags |= SEC_ACE_OBJECT_TYPE_PRESENT;
}
/* inherit object */
if (tok[4][0] != 0) {
NTSTATUS status = GUID_from_string(tok[4],
&ace->object.object.inherited_type.inherited_type);
if (!NT_STATUS_IS_OK(status)) {
return False;
}
ace->object.object.flags |= SEC_ACE_INHERITED_OBJECT_TYPE_PRESENT;
}
/* trustee */
s = tok[5];
sid = sddl_decode_sid(mem_ctx, &s, domain_sid);
if (sid == NULL) {
return False;
}
ace->trustee = *sid;
talloc_steal(mem_ctx, sid->sub_auths);
talloc_free(sid);
return True;
}
static const struct flag_map acl_flags[] = {
{ "P", SEC_DESC_DACL_PROTECTED },
{ "AR", SEC_DESC_DACL_AUTO_INHERIT_REQ },
{ "AI", SEC_DESC_DACL_AUTO_INHERITED },
{ NULL, 0 }
};
/*
decode an ACL
*/
static struct security_acl *sddl_decode_acl(struct security_descriptor *sd,
const char **sddlp, uint32_t *flags,
const struct dom_sid *domain_sid)
{
const char *sddl = *sddlp;
struct security_acl *acl;
size_t len;
*flags = 0;
acl = talloc_zero(sd, struct security_acl);
if (acl == NULL) return NULL;
acl->revision = SECURITY_ACL_REVISION_NT4;
if (isupper(sddl[0]) && sddl[1] == ':') {
/* its an empty ACL */
return acl;
}
/* work out the ACL flags */
if (!sddl_map_flags(acl_flags, sddl, flags, &len)) {
talloc_free(acl);
return NULL;
}
sddl += len;
/* now the ACEs */
while (*sddl == '(') {
char *astr;
len = strcspn(sddl+1, ")");
astr = talloc_strndup(acl, sddl+1, len);
if (astr == NULL || sddl[len+1] != ')') {
talloc_free(acl);
return NULL;
}
acl->aces = talloc_realloc(acl, acl->aces, struct security_ace,
acl->num_aces+1);
if (acl->aces == NULL) {
talloc_free(acl);
return NULL;
}
if (!sddl_decode_ace(acl->aces, &acl->aces[acl->num_aces],
astr, domain_sid)) {
talloc_free(acl);
return NULL;
}
switch (acl->aces[acl->num_aces].type) {
case SEC_ACE_TYPE_ACCESS_ALLOWED_OBJECT:
case SEC_ACE_TYPE_ACCESS_DENIED_OBJECT:
case SEC_ACE_TYPE_SYSTEM_AUDIT_OBJECT:
case SEC_ACE_TYPE_SYSTEM_ALARM_OBJECT:
acl->revision = SECURITY_ACL_REVISION_ADS;
break;
default:
break;
}
talloc_free(astr);
sddl += len+2;
acl->num_aces++;
}
(*sddlp) = sddl;
return acl;
}
/*
decode a security descriptor in SDDL format
*/
struct security_descriptor *sddl_decode(TALLOC_CTX *mem_ctx, const char *sddl,
const struct dom_sid *domain_sid)
{
struct security_descriptor *sd;
sd = talloc_zero(mem_ctx, struct security_descriptor);
sd->revision = SECURITY_DESCRIPTOR_REVISION_1;
sd->type = SEC_DESC_SELF_RELATIVE;
while (*sddl) {
uint32_t flags;
char c = sddl[0];
if (sddl[1] != ':') goto failed;
sddl += 2;
switch (c) {
case 'D':
if (sd->dacl != NULL) goto failed;
sd->dacl = sddl_decode_acl(sd, &sddl, &flags, domain_sid);
if (sd->dacl == NULL) goto failed;
sd->type |= flags | SEC_DESC_DACL_PRESENT;
break;
case 'S':
if (sd->sacl != NULL) goto failed;
sd->sacl = sddl_decode_acl(sd, &sddl, &flags, domain_sid);
if (sd->sacl == NULL) goto failed;
/* this relies on the SEC_DESC_SACL_* flags being
1 bit shifted from the SEC_DESC_DACL_* flags */
sd->type |= (flags<<1) | SEC_DESC_SACL_PRESENT;
break;
case 'O':
if (sd->owner_sid != NULL) goto failed;
sd->owner_sid = sddl_decode_sid(sd, &sddl, domain_sid);
if (sd->owner_sid == NULL) goto failed;
break;
case 'G':
if (sd->group_sid != NULL) goto failed;
sd->group_sid = sddl_decode_sid(sd, &sddl, domain_sid);
if (sd->group_sid == NULL) goto failed;
break;
}
}
return sd;
failed:
DEBUG(2,("Badly formatted SDDL '%s'\n", sddl));
talloc_free(sd);
return NULL;
}
/*
turn a set of flags into a string
*/
static char *sddl_flags_to_string(TALLOC_CTX *mem_ctx, const struct flag_map *map,
uint32_t flags, BOOL check_all)
{
int i;
char *s;
/* try to find an exact match */
for (i=0;map[i].name;i++) {
if (map[i].flag == flags) {
return talloc_strdup(mem_ctx, map[i].name);
}
}
s = talloc_strdup(mem_ctx, "");
/* now by bits */
for (i=0;map[i].name;i++) {
if ((flags & map[i].flag) != 0) {
s = talloc_asprintf_append(s, "%s", map[i].name);
if (s == NULL) goto failed;
flags &= ~map[i].flag;
}
}
if (check_all && flags != 0) {
goto failed;
}
return s;
failed:
talloc_free(s);
return NULL;
}
/*
encode a sid in SDDL format
*/
static char *sddl_encode_sid(TALLOC_CTX *mem_ctx, const struct dom_sid *sid,
const struct dom_sid *domain_sid)
{
int i;
char *sidstr;
sidstr = dom_sid_string(mem_ctx, sid);
if (sidstr == NULL) return NULL;
/* seen if its a well known sid */
for (i=0;sid_codes[i].sid;i++) {
if (strcmp(sidstr, sid_codes[i].sid) == 0) {
talloc_free(sidstr);
return talloc_strdup(mem_ctx, sid_codes[i].code);
}
}
/* or a well known rid in our domain */
if (dom_sid_in_domain(domain_sid, sid)) {
uint32_t rid = sid->sub_auths[sid->num_auths-1];
for (;i<ARRAY_SIZE(sid_codes);i++) {
if (rid == sid_codes[i].rid) {
talloc_free(sidstr);
return talloc_strdup(mem_ctx, sid_codes[i].code);
}
}
}
talloc_free(sidstr);
/* TODO: encode well known sids as two letter codes */
return dom_sid_string(mem_ctx, sid);
}
/*
encode an ACE in SDDL format
*/
static char *sddl_encode_ace(TALLOC_CTX *mem_ctx, const struct security_ace *ace,
const struct dom_sid *domain_sid)
{
char *sddl = NULL;
TALLOC_CTX *tmp_ctx;
const char *s_type="", *s_flags="", *s_mask="",
*s_object="", *s_iobject="", *s_trustee="";
tmp_ctx = talloc_new(mem_ctx);
if (tmp_ctx == NULL) {
DEBUG(0, ("talloc_new failed\n"));
return NULL;
}
s_type = sddl_flags_to_string(tmp_ctx, ace_types, ace->type, True);
if (s_type == NULL) goto failed;
s_flags = sddl_flags_to_string(tmp_ctx, ace_flags, ace->flags, True);
if (s_flags == NULL) goto failed;
s_mask = sddl_flags_to_string(tmp_ctx, ace_access_mask, ace->access_mask, True);
if (s_mask == NULL) {
s_mask = talloc_asprintf(tmp_ctx, "0x%08x", ace->access_mask);
if (s_mask == NULL) goto failed;
}
if (ace->type == SEC_ACE_TYPE_ACCESS_ALLOWED_OBJECT ||
ace->type == SEC_ACE_TYPE_ACCESS_DENIED_OBJECT ||
ace->type == SEC_ACE_TYPE_SYSTEM_AUDIT_OBJECT ||
ace->type == SEC_ACE_TYPE_SYSTEM_AUDIT_OBJECT) {
if (ace->object.object.flags & SEC_ACE_OBJECT_TYPE_PRESENT) {
s_object = GUID_string(tmp_ctx, &ace->object.object.type.type);
if (s_object == NULL) goto failed;
}
if (ace->object.object.flags & SEC_ACE_INHERITED_OBJECT_TYPE_PRESENT) {
s_iobject = GUID_string(tmp_ctx, &ace->object.object.inherited_type.inherited_type);
if (s_iobject == NULL) goto failed;
}
}
s_trustee = sddl_encode_sid(tmp_ctx, &ace->trustee, domain_sid);
if (s_trustee == NULL) goto failed;
sddl = talloc_asprintf(mem_ctx, "%s;%s;%s;%s;%s;%s",
s_type, s_flags, s_mask, s_object, s_iobject, s_trustee);
failed:
talloc_free(tmp_ctx);
return sddl;
}
/*
encode an ACL in SDDL format
*/
static char *sddl_encode_acl(TALLOC_CTX *mem_ctx, const struct security_acl *acl,
uint32_t flags, const struct dom_sid *domain_sid)
{
char *sddl;
int i;
/* add any ACL flags */
sddl = sddl_flags_to_string(mem_ctx, acl_flags, flags, False);
if (sddl == NULL) goto failed;
/* now the ACEs, encoded in braces */
for (i=0;i<acl->num_aces;i++) {
char *ace = sddl_encode_ace(sddl, &acl->aces[i], domain_sid);
if (ace == NULL) goto failed;
sddl = talloc_asprintf_append(sddl, "(%s)", ace);
if (sddl == NULL) goto failed;
talloc_free(ace);
}
return sddl;
failed:
talloc_free(sddl);
return NULL;
}
/*
encode a security descriptor to SDDL format
*/
char *sddl_encode(TALLOC_CTX *mem_ctx, const struct security_descriptor *sd,
const struct dom_sid *domain_sid)
{
char *sddl;
TALLOC_CTX *tmp_ctx;
/* start with a blank string */
sddl = talloc_strdup(mem_ctx, "");
if (sddl == NULL) goto failed;
tmp_ctx = talloc_new(mem_ctx);
if (sd->owner_sid != NULL) {
char *sid = sddl_encode_sid(tmp_ctx, sd->owner_sid, domain_sid);
if (sid == NULL) goto failed;
sddl = talloc_asprintf_append(sddl, "O:%s", sid);
if (sddl == NULL) goto failed;
}
if (sd->group_sid != NULL) {
char *sid = sddl_encode_sid(tmp_ctx, sd->group_sid, domain_sid);
if (sid == NULL) goto failed;
sddl = talloc_asprintf_append(sddl, "G:%s", sid);
if (sddl == NULL) goto failed;
}
if ((sd->type & SEC_DESC_DACL_PRESENT) && sd->dacl != NULL) {
char *acl = sddl_encode_acl(tmp_ctx, sd->dacl, sd->type, domain_sid);
if (acl == NULL) goto failed;
sddl = talloc_asprintf_append(sddl, "D:%s", acl);
if (sddl == NULL) goto failed;
}
if ((sd->type & SEC_DESC_SACL_PRESENT) && sd->sacl != NULL) {
char *acl = sddl_encode_acl(tmp_ctx, sd->sacl, sd->type>>1, domain_sid);
if (acl == NULL) goto failed;
sddl = talloc_asprintf_append(sddl, "S:%s", acl);
if (sddl == NULL) goto failed;
}
talloc_free(tmp_ctx);
return sddl;
failed:
talloc_free(sddl);
return NULL;
}
|