704 lines
21 KiB
C++
704 lines
21 KiB
C++
/* sec_helper.cc: NT security helper functions
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Copyright 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010,
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2011, 2012, 2013, 2014 Red Hat, Inc.
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Written by Corinna Vinschen <corinna@vinschen.de>
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This file is part of Cygwin.
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This software is a copyrighted work licensed under the terms of the
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Cygwin license. Please consult the file "CYGWIN_LICENSE" for
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details. */
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#include "winsup.h"
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#include <stdlib.h>
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#include <sys/acl.h>
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#include <wchar.h>
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#include "cygerrno.h"
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#include "security.h"
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#include "path.h"
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#include "fhandler.h"
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#include "dtable.h"
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#include "pinfo.h"
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#include "cygheap.h"
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#include "ntdll.h"
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#include "ldap.h"
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/* General purpose security attribute objects for global use. */
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static NO_COPY_RO SECURITY_DESCRIPTOR null_sdp =
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{ SECURITY_DESCRIPTOR_REVISION, 0, SE_DACL_PRESENT,
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NULL, NULL, NULL, NULL };
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SECURITY_ATTRIBUTES NO_COPY_RO sec_none =
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{ sizeof (SECURITY_ATTRIBUTES), NULL, TRUE };
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SECURITY_ATTRIBUTES NO_COPY_RO sec_none_nih =
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{ sizeof (SECURITY_ATTRIBUTES), NULL, FALSE };
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SECURITY_ATTRIBUTES NO_COPY_RO sec_all =
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{ sizeof (SECURITY_ATTRIBUTES), &null_sdp, TRUE };
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SECURITY_ATTRIBUTES NO_COPY_RO sec_all_nih =
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{ sizeof (SECURITY_ATTRIBUTES), &null_sdp, FALSE };
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MKSID (well_known_null_sid, "S-1-0-0",
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SECURITY_NULL_SID_AUTHORITY, 1, SECURITY_NULL_RID);
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MKSID (well_known_world_sid, "S-1-1-0",
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SECURITY_WORLD_SID_AUTHORITY, 1, SECURITY_WORLD_RID);
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MKSID (well_known_local_sid, "S-1-2-0",
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SECURITY_LOCAL_SID_AUTHORITY, 1, SECURITY_LOCAL_RID);
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MKSID (well_known_console_logon_sid, "S-1-2-1",
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SECURITY_LOCAL_SID_AUTHORITY, 1, 1);
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MKSID (well_known_creator_owner_sid, "S-1-3-0",
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SECURITY_CREATOR_SID_AUTHORITY, 1, SECURITY_CREATOR_OWNER_RID);
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MKSID (well_known_creator_group_sid, "S-1-3-1",
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SECURITY_CREATOR_SID_AUTHORITY, 1, SECURITY_CREATOR_GROUP_RID);
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MKSID (well_known_dialup_sid, "S-1-5-1",
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SECURITY_NT_AUTHORITY, 1, SECURITY_DIALUP_RID);
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MKSID (well_known_network_sid, "S-1-5-2",
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SECURITY_NT_AUTHORITY, 1, SECURITY_NETWORK_RID);
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MKSID (well_known_batch_sid, "S-1-5-3",
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SECURITY_NT_AUTHORITY, 1, SECURITY_BATCH_RID);
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MKSID (well_known_interactive_sid, "S-1-5-4",
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SECURITY_NT_AUTHORITY, 1, SECURITY_INTERACTIVE_RID);
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MKSID (well_known_service_sid, "S-1-5-6",
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SECURITY_NT_AUTHORITY, 1, SECURITY_SERVICE_RID);
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MKSID (well_known_authenticated_users_sid, "S-1-5-11",
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SECURITY_NT_AUTHORITY, 1, SECURITY_AUTHENTICATED_USER_RID);
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MKSID (well_known_this_org_sid, "S-1-5-15",
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SECURITY_NT_AUTHORITY, 1, 15);
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MKSID (well_known_system_sid, "S-1-5-18",
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SECURITY_NT_AUTHORITY, 1, SECURITY_LOCAL_SYSTEM_RID);
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MKSID (well_known_local_service_sid, "S-1-5-19",
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SECURITY_NT_AUTHORITY, 1, SECURITY_LOCAL_SERVICE_RID);
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MKSID (well_known_network_service_sid, "S-1-5-20",
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SECURITY_NT_AUTHORITY, 1, SECURITY_NETWORK_SERVICE_RID);
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MKSID (well_known_builtin_sid, "S-1-5-32",
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SECURITY_NT_AUTHORITY, 1, SECURITY_BUILTIN_DOMAIN_RID);
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MKSID (well_known_admins_sid, "S-1-5-32-544",
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SECURITY_NT_AUTHORITY, 2, SECURITY_BUILTIN_DOMAIN_RID,
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DOMAIN_ALIAS_RID_ADMINS);
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MKSID (well_known_users_sid, "S-1-5-32-545",
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SECURITY_NT_AUTHORITY, 2, SECURITY_BUILTIN_DOMAIN_RID,
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DOMAIN_ALIAS_RID_USERS);
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MKSID (trusted_installer_sid,
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"S-1-5-80-956008885-3418522649-1831038044-1853292631-2271478464",
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SECURITY_NT_AUTHORITY, SECURITY_SERVICE_ID_RID_COUNT,
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SECURITY_SERVICE_ID_BASE_RID, 956008885U, 3418522649U, 1831038044U,
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1853292631U, 2271478464U);
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MKSID (mandatory_medium_integrity_sid, "S-1-16-8192",
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SECURITY_MANDATORY_LABEL_AUTHORITY, 1, SECURITY_MANDATORY_MEDIUM_RID);
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MKSID (mandatory_high_integrity_sid, "S-1-16-12288",
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SECURITY_MANDATORY_LABEL_AUTHORITY, 1, SECURITY_MANDATORY_HIGH_RID);
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MKSID (mandatory_system_integrity_sid, "S-1-16-16384",
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SECURITY_MANDATORY_LABEL_AUTHORITY, 1, SECURITY_MANDATORY_SYSTEM_RID);
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/* UNIX accounts on a Samba server have the SID prefix "S-1-22-1" */
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#define SECURITY_SAMBA_UNIX_AUTHORITY {0,0,0,0,0,22}
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MKSID (well_known_samba_unix_user_fake_sid, "S-1-22-1-0",
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SECURITY_SAMBA_UNIX_AUTHORITY, 2, 1, 0);
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bool
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cygpsid::operator== (const char *nsidstr) const
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{
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cygsid nsid (nsidstr);
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return psid == nsid;
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}
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uid_t
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cygpsid::get_id (BOOL search_grp, int *type, cyg_ldap *pldap)
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{
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/* First try to get SID from group, then passwd */
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uid_t id = ILLEGAL_UID;
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if (search_grp)
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{
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struct group *gr;
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if (cygheap->user.groups.pgsid == psid)
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id = myself->gid;
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else if (sid_id_auth (psid) == 22)
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{
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/* Samba UNIX group. Try to map to Cygwin gid. If there's no
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mapping in the cache, try to fetch it from the configured
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RFC 2307 domain (see last comment in cygheap_domain_info::init()
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for more information) and add it to the mapping cache. */
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gid_t gid = sid_sub_auth_rid (psid);
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gid_t map_gid = cygheap->ugid_cache.get_gid (gid);
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if (map_gid == ILLEGAL_GID)
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{
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if (pldap->open (cygheap->dom.get_rfc2307_domain ()))
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map_gid = pldap->remap_gid (gid);
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if (map_gid == ILLEGAL_GID)
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map_gid = MAP_UNIX_TO_CYGWIN_ID (gid);
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cygheap->ugid_cache.add_gid (gid, map_gid);
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}
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id = (uid_t) map_gid;
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}
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else if ((gr = internal_getgrsid (*this, pldap)))
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id = gr->gr_gid;
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if ((gid_t) id != ILLEGAL_GID)
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{
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if (type)
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*type = GROUP;
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return id;
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}
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}
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if (!search_grp || type)
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{
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struct passwd *pw;
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if (*this == cygheap->user.sid ())
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id = myself->uid;
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else if (sid_id_auth (psid) == 22)
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{
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/* Samba UNIX user. See comment above. */
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uid_t uid = sid_sub_auth_rid (psid);
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uid_t map_uid = cygheap->ugid_cache.get_uid (uid);
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if (map_uid == ILLEGAL_UID)
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{
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if (pldap->open (cygheap->dom.get_rfc2307_domain ()))
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map_uid = pldap->remap_uid (uid);
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if (map_uid == ILLEGAL_UID)
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map_uid = MAP_UNIX_TO_CYGWIN_ID (uid);
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cygheap->ugid_cache.add_uid (uid, map_uid);
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}
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id = map_uid;
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}
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else if ((pw = internal_getpwsid (*this, pldap)))
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id = pw->pw_uid;
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if (id != ILLEGAL_UID && type)
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*type = USER;
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}
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return id;
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}
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PWCHAR
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cygpsid::pstring (PWCHAR nsidstr) const
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{
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UNICODE_STRING sid;
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if (!psid || !nsidstr)
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return NULL;
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RtlInitEmptyUnicodeString (&sid, nsidstr, 256);
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RtlConvertSidToUnicodeString (&sid, psid, FALSE);
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return nsidstr + sid.Length / sizeof (WCHAR);
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}
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PWCHAR
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cygpsid::string (PWCHAR nsidstr) const
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{
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if (pstring (nsidstr))
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return nsidstr;
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return NULL;
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}
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char *
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cygpsid::pstring (char *nsidstr) const
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{
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char *t;
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DWORD i;
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if (!psid || !nsidstr)
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return NULL;
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strcpy (nsidstr, "S-1-");
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t = nsidstr + sizeof ("S-1-") - 1;
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t += __small_sprintf (t, "%u", sid_id_auth (psid));
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for (i = 0; i < *RtlSubAuthorityCountSid (psid); ++i)
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t += __small_sprintf (t, "-%lu", sid_sub_auth (psid, i));
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return t;
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}
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char *
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cygpsid::string (char *nsidstr) const
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{
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if (pstring (nsidstr))
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return nsidstr;
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return NULL;
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}
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PSID
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cygsid::get_sid (DWORD s, DWORD cnt, DWORD *r, bool well_known)
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{
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DWORD i;
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SID_IDENTIFIER_AUTHORITY sid_auth = { SECURITY_NULL_SID_AUTHORITY };
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# define SECURITY_NT_AUTH 5
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if (s > 255 || cnt < 1 || cnt > 8)
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{
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psid = NO_SID;
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return NULL;
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}
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sid_auth.Value[5] = s;
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set ();
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RtlInitializeSid (psid, &sid_auth, cnt);
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for (i = 0; i < cnt; ++i)
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memcpy ((char *) psid + 8 + sizeof (DWORD) * i, &r[i], sizeof (DWORD));
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/* If the well_known flag isn't set explicitely, we check the SID
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for being a well-known SID ourselves. That's necessary because this
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cygsid is created from a SID string, usually from /etc/passwd or
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/etc/group. The calling code just doesn't know if the SID is well-known
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or not. All SIDs are well-known SIDs, except those in the non-unique NT
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authority range. */
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if (well_known)
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well_known_sid = well_known;
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else
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well_known_sid = (s != SECURITY_NT_AUTH
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|| r[0] != SECURITY_NT_NON_UNIQUE);
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return psid;
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}
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const PSID
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cygsid::getfromstr (PCWSTR nsidstr, bool well_known)
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{
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PWCHAR lasts;
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DWORD s, cnt = 0;
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DWORD r[8];
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if (nsidstr && !wcsncmp (nsidstr, L"S-1-", 4))
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{
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s = wcstoul (nsidstr + 4, &lasts, 10);
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while (cnt < 8 && *lasts == '-')
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r[cnt++] = wcstoul (lasts + 1, &lasts, 10);
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if (!*lasts)
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return get_sid (s, cnt, r, well_known);
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}
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return psid = NO_SID;
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}
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const PSID
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cygsid::getfromstr (const char *nsidstr, bool well_known)
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{
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char *lasts;
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DWORD s, cnt = 0;
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DWORD r[8];
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if (nsidstr && !strncmp (nsidstr, "S-1-", 4))
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{
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s = strtoul (nsidstr + 4, &lasts, 10);
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while (cnt < 8 && *lasts == '-')
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r[cnt++] = strtoul (lasts + 1, &lasts, 10);
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if (!*lasts)
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return get_sid (s, cnt, r, well_known);
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}
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return psid = NO_SID;
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}
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BOOL
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cygsid::getfrompw (const struct passwd *pw)
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{
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char *sp = (pw && pw->pw_gecos) ? strrchr (pw->pw_gecos, ',') : NULL;
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return (*this = sp ? sp + 1 : sp) != NULL;
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}
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BOOL
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cygsid::getfromgr (const struct group *gr)
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{
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char *sp = (gr && gr->gr_passwd) ? gr->gr_passwd : NULL;
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return (*this = sp) != NULL;
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}
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cygsid *
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cygsidlist::alloc_sids (int n)
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{
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if (n > 0)
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return (cygsid *) cmalloc (HEAP_STR, n * sizeof (cygsid));
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else
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return NULL;
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}
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void
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cygsidlist::free_sids ()
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{
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if (sids)
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cfree (sids);
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sids = NULL;
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cnt = maxcnt = 0;
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type = cygsidlist_empty;
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}
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BOOL
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cygsidlist::add (const PSID nsi, bool well_known)
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{
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if (contains (nsi))
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return TRUE;
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if (cnt >= maxcnt)
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{
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cygsid *tmp = new cygsid [2 * maxcnt];
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if (!tmp)
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return FALSE;
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maxcnt *= 2;
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for (int i = 0; i < cnt; ++i)
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tmp[i] = sids[i];
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delete [] sids;
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sids = tmp;
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}
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if (well_known)
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sids[cnt++] *= nsi;
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else
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sids[cnt++] = nsi;
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return TRUE;
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}
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bool
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get_sids_info (cygpsid owner_sid, cygpsid group_sid, uid_t * uidret, gid_t * gidret)
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{
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BOOL ret = false;
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cyg_ldap cldap;
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owner_sid.debug_print ("get_sids_info: owner SID =");
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group_sid.debug_print ("get_sids_info: group SID =");
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*uidret = owner_sid.get_uid (&cldap);
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*gidret = group_sid.get_gid (&cldap);
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if (*uidret == myself->uid)
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{
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if (*gidret == myself->gid)
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ret = TRUE;
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else
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CheckTokenMembership (cygheap->user.issetuid ()
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? cygheap->user.imp_token () : NULL,
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group_sid, &ret);
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}
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return (bool) ret;
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}
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PSECURITY_DESCRIPTOR
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security_descriptor::malloc (size_t nsize)
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{
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free ();
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if ((psd = (PSECURITY_DESCRIPTOR) ::malloc (nsize)))
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sd_size = nsize;
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return psd;
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}
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PSECURITY_DESCRIPTOR
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security_descriptor::realloc (size_t nsize)
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{
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PSECURITY_DESCRIPTOR tmp;
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/* Can't re-use buffer allocated by GetSecurityInfo. */
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if (psd && !sd_size)
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free ();
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if (!(tmp = (PSECURITY_DESCRIPTOR) ::realloc (psd, nsize)))
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return NULL;
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sd_size = nsize;
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return psd = tmp;
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}
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void
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security_descriptor::free ()
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{
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if (psd)
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{
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if (!sd_size)
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LocalFree (psd);
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else
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::free (psd);
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}
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psd = NULL;
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sd_size = 0;
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}
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#undef TEXT
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#define TEXT(q) L##q
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/* Index must match the corresponding foo_PRIVILEGE value, see security.h. */
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static const struct {
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const wchar_t *name;
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bool high_integrity; /* UAC: High Mandatory Label required to
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be allowed to enable this privilege in
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the user token. */
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} cygpriv[] =
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{
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{ L"", false },
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{ L"", false },
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{ SE_CREATE_TOKEN_NAME, true },
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{ SE_ASSIGNPRIMARYTOKEN_NAME, true },
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{ SE_LOCK_MEMORY_NAME, false },
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{ SE_INCREASE_QUOTA_NAME, true },
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{ SE_MACHINE_ACCOUNT_NAME, false },
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{ SE_TCB_NAME, true },
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{ SE_SECURITY_NAME, true },
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{ SE_TAKE_OWNERSHIP_NAME, true },
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{ SE_LOAD_DRIVER_NAME, true },
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{ SE_SYSTEM_PROFILE_NAME, true },
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{ SE_SYSTEMTIME_NAME, true },
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{ SE_PROF_SINGLE_PROCESS_NAME, true },
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{ SE_INC_BASE_PRIORITY_NAME, true },
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{ SE_CREATE_PAGEFILE_NAME, true },
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{ SE_CREATE_PERMANENT_NAME, false },
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{ SE_BACKUP_NAME, true },
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{ SE_RESTORE_NAME, true },
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{ SE_SHUTDOWN_NAME, false },
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{ SE_DEBUG_NAME, true },
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{ SE_AUDIT_NAME, false },
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{ SE_SYSTEM_ENVIRONMENT_NAME, true },
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{ SE_CHANGE_NOTIFY_NAME, false },
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{ SE_REMOTE_SHUTDOWN_NAME, true },
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{ SE_UNDOCK_NAME, false },
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{ SE_SYNC_AGENT_NAME, false },
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{ SE_ENABLE_DELEGATION_NAME, false },
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{ SE_MANAGE_VOLUME_NAME, true },
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{ SE_IMPERSONATE_NAME, true },
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{ SE_CREATE_GLOBAL_NAME, false },
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{ SE_TRUSTED_CREDMAN_ACCESS_NAME, false },
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{ SE_RELABEL_NAME, true },
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{ SE_INC_WORKING_SET_NAME, false },
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{ SE_TIME_ZONE_NAME, true },
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{ SE_CREATE_SYMBOLIC_LINK_NAME, true }
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};
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bool
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privilege_luid (const PWCHAR pname, LUID &luid, bool &high_integrity)
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{
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ULONG idx;
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for (idx = SE_CREATE_TOKEN_PRIVILEGE;
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idx <= SE_MAX_WELL_KNOWN_PRIVILEGE;
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++idx)
|
|
if (!wcscmp (cygpriv[idx].name, pname))
|
|
{
|
|
luid.HighPart = 0;
|
|
luid.LowPart = idx;
|
|
high_integrity = cygpriv[idx].high_integrity;
|
|
return true;
|
|
}
|
|
return false;
|
|
}
|
|
|
|
static const wchar_t *
|
|
privilege_name (const LUID &priv_luid)
|
|
{
|
|
if (priv_luid.HighPart || priv_luid.LowPart < SE_CREATE_TOKEN_PRIVILEGE
|
|
|| priv_luid.LowPart > SE_MAX_WELL_KNOWN_PRIVILEGE)
|
|
return L"<unknown privilege>";
|
|
return cygpriv[priv_luid.LowPart].name;
|
|
}
|
|
|
|
int
|
|
set_privilege (HANDLE token, DWORD privilege, bool enable)
|
|
{
|
|
int ret = -1;
|
|
TOKEN_PRIVILEGES new_priv, orig_priv;
|
|
ULONG size;
|
|
NTSTATUS status;
|
|
|
|
new_priv.PrivilegeCount = 1;
|
|
new_priv.Privileges[0].Luid.HighPart = 0L;
|
|
new_priv.Privileges[0].Luid.LowPart = privilege;
|
|
new_priv.Privileges[0].Attributes = enable ? SE_PRIVILEGE_ENABLED : 0;
|
|
|
|
status = NtAdjustPrivilegesToken (token, FALSE, &new_priv, sizeof orig_priv,
|
|
&orig_priv, &size);
|
|
if (!NT_SUCCESS (status))
|
|
{
|
|
__seterrno_from_nt_status (status);
|
|
goto out;
|
|
}
|
|
|
|
/* If orig_priv.PrivilegeCount is 0, the privilege hasn't been changed. */
|
|
if (!orig_priv.PrivilegeCount)
|
|
ret = enable ? 1 : 0;
|
|
else
|
|
ret = (orig_priv.Privileges[0].Attributes & SE_PRIVILEGE_ENABLED) ? 1 : 0;
|
|
|
|
out:
|
|
if (ret < 0)
|
|
debug_printf ("%d = set_privilege((token %p) %W, %d)", ret, token,
|
|
privilege_name (new_priv.Privileges[0].Luid), enable);
|
|
return ret;
|
|
}
|
|
|
|
/* This is called very early in process initialization. The code must
|
|
not depend on anything. */
|
|
void
|
|
set_cygwin_privileges (HANDLE token)
|
|
{
|
|
/* Setting these rights at process startup allows processes running under
|
|
user tokens which are in the administrstors group to have root-like
|
|
permissions. */
|
|
/* Allow to access all files, independent of their ACL settings. */
|
|
set_privilege (token, SE_RESTORE_PRIVILEGE, true);
|
|
set_privilege (token, SE_BACKUP_PRIVILEGE, true);
|
|
/* Allow full access to other user's processes. */
|
|
set_privilege (token, SE_DEBUG_PRIVILEGE, true);
|
|
#if 0
|
|
/* Allow to create global shared memory. This isn't required anymore since
|
|
Cygwin 1.7. It uses its own subdirectories in the global NT namespace
|
|
which isn't affected by the SE_CREATE_GLOBAL_PRIVILEGE restriction. */
|
|
set_privilege (token, SE_CREATE_GLOBAL_PRIVILEGE, true);
|
|
#endif
|
|
}
|
|
|
|
bool
|
|
sec_acl (PACL acl, bool original, bool admins, PSID sid1, PSID sid2, DWORD access2)
|
|
{
|
|
NTSTATUS status;
|
|
size_t acl_len = MAX_DACL_LEN (5);
|
|
LPVOID pAce;
|
|
cygpsid psid;
|
|
|
|
#ifdef DEBUGGING
|
|
if ((unsigned long) acl % 4)
|
|
api_fatal ("Incorrectly aligned incoming ACL buffer!");
|
|
#endif
|
|
status = RtlCreateAcl (acl, acl_len, ACL_REVISION);
|
|
if (!NT_SUCCESS (status))
|
|
{
|
|
debug_printf ("RtlCreateAcl: %y", status);
|
|
return false;
|
|
}
|
|
if (sid1)
|
|
{
|
|
status = RtlAddAccessAllowedAce (acl, ACL_REVISION, GENERIC_ALL, sid1);
|
|
if (!NT_SUCCESS (status))
|
|
debug_printf ("RtlAddAccessAllowedAce(sid1) %y", status);
|
|
}
|
|
if (original && (psid = cygheap->user.saved_sid ())
|
|
&& psid != sid1 && psid != well_known_system_sid)
|
|
{
|
|
status = RtlAddAccessAllowedAce (acl, ACL_REVISION, GENERIC_ALL, psid);
|
|
if (!NT_SUCCESS (status))
|
|
debug_printf ("RtlAddAccessAllowedAce(original) %y", status);
|
|
}
|
|
if (sid2)
|
|
{
|
|
status = RtlAddAccessAllowedAce (acl, ACL_REVISION, access2, sid2);
|
|
if (!NT_SUCCESS (status))
|
|
debug_printf ("RtlAddAccessAllowedAce(sid2) %y", status);
|
|
}
|
|
if (admins)
|
|
{
|
|
status = RtlAddAccessAllowedAce (acl, ACL_REVISION, GENERIC_ALL,
|
|
well_known_admins_sid);
|
|
if (!NT_SUCCESS (status))
|
|
debug_printf ("RtlAddAccessAllowedAce(admin) %y", status);
|
|
}
|
|
status = RtlAddAccessAllowedAce (acl, ACL_REVISION, GENERIC_ALL,
|
|
well_known_system_sid);
|
|
if (!NT_SUCCESS (status))
|
|
debug_printf ("RtlAddAccessAllowedAce(system) %y", status);
|
|
status = RtlFirstFreeAce (acl, &pAce);
|
|
if (NT_SUCCESS (status) && pAce)
|
|
acl->AclSize = (char *) pAce - (char *) acl;
|
|
else
|
|
debug_printf ("RtlFirstFreeAce: %y", status);
|
|
|
|
return true;
|
|
}
|
|
|
|
PSECURITY_ATTRIBUTES __reg3
|
|
__sec_user (PVOID sa_buf, PSID sid1, PSID sid2, DWORD access2, BOOL inherit)
|
|
{
|
|
PSECURITY_ATTRIBUTES psa = (PSECURITY_ATTRIBUTES) sa_buf;
|
|
PISECURITY_DESCRIPTOR psd = (PISECURITY_DESCRIPTOR)
|
|
((char *) sa_buf + sizeof (*psa));
|
|
PACL acl = (PACL) ((char *) sa_buf + sizeof (*psa) + sizeof (*psd));
|
|
NTSTATUS status;
|
|
|
|
#ifdef DEBUGGING
|
|
if ((unsigned long) sa_buf % 4)
|
|
api_fatal ("Incorrectly aligned incoming SA buffer!");
|
|
#endif
|
|
if (!sec_acl (acl, true, true, sid1, sid2, access2))
|
|
return inherit ? &sec_none : &sec_none_nih;
|
|
|
|
RtlCreateSecurityDescriptor (psd, SECURITY_DESCRIPTOR_REVISION);
|
|
status = RtlSetDaclSecurityDescriptor (psd, TRUE, acl, FALSE);
|
|
if (!NT_SUCCESS (status))
|
|
debug_printf ("RtlSetDaclSecurityDescriptor %y", status);
|
|
|
|
psa->nLength = sizeof (SECURITY_ATTRIBUTES);
|
|
psa->lpSecurityDescriptor = psd;
|
|
psa->bInheritHandle = inherit;
|
|
return psa;
|
|
}
|
|
|
|
/* Helper function to create a file security descriptor which allows
|
|
full access to admins, system, and the sid given as parameter. See
|
|
try_to_bin for how it's used. */
|
|
|
|
PSECURITY_DESCRIPTOR
|
|
_recycler_sd (void *buf, bool users, bool dir)
|
|
{
|
|
NTSTATUS status;
|
|
PISECURITY_DESCRIPTOR psd = (PISECURITY_DESCRIPTOR) buf;
|
|
|
|
if (!psd)
|
|
return NULL;
|
|
RtlCreateSecurityDescriptor (psd, SECURITY_DESCRIPTOR_REVISION);
|
|
PACL dacl = (PACL) (psd + 1);
|
|
/* Pre-Vista, the per-user recycler dir has a rather too complicated
|
|
ACL by default, which has distinct ACEs for inheritable and non-inheritable
|
|
permissions. However, this ACL is practically equivalent to the ACL
|
|
created since Vista. Therefore we simplify our job here and create the
|
|
pre-Vista permissions the same way as on Vista and later. */
|
|
RtlCreateAcl (dacl, MAX_DACL_LEN (3), ACL_REVISION);
|
|
RtlAddAccessAllowedAceEx (dacl, ACL_REVISION,
|
|
dir ? CONTAINER_INHERIT_ACE | OBJECT_INHERIT_ACE
|
|
: NO_INHERITANCE,
|
|
FILE_ALL_ACCESS, well_known_admins_sid);
|
|
RtlAddAccessAllowedAceEx (dacl, ACL_REVISION,
|
|
dir ? CONTAINER_INHERIT_ACE | OBJECT_INHERIT_ACE
|
|
: NO_INHERITANCE,
|
|
FILE_ALL_ACCESS, well_known_system_sid);
|
|
if (users)
|
|
RtlAddAccessAllowedAceEx (dacl, ACL_REVISION, NO_PROPAGATE_INHERIT_ACE,
|
|
FILE_GENERIC_READ | FILE_GENERIC_EXECUTE
|
|
| FILE_APPEND_DATA | FILE_WRITE_ATTRIBUTES,
|
|
well_known_users_sid);
|
|
else
|
|
RtlAddAccessAllowedAceEx (dacl, ACL_REVISION,
|
|
dir ? CONTAINER_INHERIT_ACE
|
|
| OBJECT_INHERIT_ACE
|
|
: NO_INHERITANCE,
|
|
FILE_ALL_ACCESS, cygheap->user.sid ());
|
|
LPVOID ace;
|
|
status = RtlFirstFreeAce (dacl, &ace);
|
|
if (!NT_SUCCESS (status))
|
|
{
|
|
debug_printf ("RtlFirstFreeAce: %y", status);
|
|
return NULL;
|
|
}
|
|
dacl->AclSize = (char *) ace - (char *) dacl;
|
|
RtlSetDaclSecurityDescriptor (psd, TRUE, dacl, FALSE);
|
|
/* If the directory DACL is not marked as protected, shell32 thinks
|
|
the recycle dir is corrupted. As soon as Explorer accesses the
|
|
Recycler, the user will get a GUI dialog "The Recycle Bin on X:\
|
|
is corrupted. Do you want to empty the Recycle Bin for this drive?"
|
|
Of course we want to avoid that. */
|
|
if (dir)
|
|
psd->Control |= SE_DACL_PROTECTED;
|
|
return psd;
|
|
}
|
|
|
|
/* Helper function to create an event security descriptor which only allows
|
|
specific access to everyone. Only the creating process has all access
|
|
rights. */
|
|
|
|
PSECURITY_DESCRIPTOR
|
|
_everyone_sd (void *buf, ACCESS_MASK access)
|
|
{
|
|
NTSTATUS status;
|
|
PISECURITY_DESCRIPTOR psd = (PISECURITY_DESCRIPTOR) buf;
|
|
|
|
if (psd)
|
|
{
|
|
RtlCreateSecurityDescriptor (psd, SECURITY_DESCRIPTOR_REVISION);
|
|
PACL dacl = (PACL) (psd + 1);
|
|
RtlCreateAcl (dacl, MAX_DACL_LEN (1), ACL_REVISION);
|
|
status = RtlAddAccessAllowedAce (dacl, ACL_REVISION, access,
|
|
well_known_world_sid);
|
|
if (!NT_SUCCESS (status))
|
|
{
|
|
debug_printf ("RtlAddAccessAllowedAce: %y", status);
|
|
return NULL;
|
|
}
|
|
LPVOID ace;
|
|
status = RtlFirstFreeAce (dacl, &ace);
|
|
if (!NT_SUCCESS (status))
|
|
{
|
|
debug_printf ("RtlFirstFreeAce: %y", status);
|
|
return NULL;
|
|
}
|
|
dacl->AclSize = (char *) ace - (char *) dacl;
|
|
RtlSetDaclSecurityDescriptor (psd, TRUE, dacl, FALSE);
|
|
}
|
|
return psd;
|
|
}
|
|
|