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newlib-cygwin/winsup/cygwin/security.h

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/* security.h: security declarations
Copyright 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010,
2011, 2012, 2013, 2014 Red Hat, Inc.
This file is part of Cygwin.
This software is a copyrighted work licensed under the terms of the
Cygwin license. Please consult the file "CYGWIN_LICENSE" for
details. */
#pragma once
#include <accctrl.h>
#include <dsgetdc.h>
/* Special file attribute set, for instance, in open() and mkdir() to
flag that a file has just been created. Used in alloc_sd, see there. */
#define S_JUSTCREATED 0x80000000
/* UID/GID */
void uinfo_init ();
#define ILLEGAL_UID ((uid_t)-1)
#define ILLEGAL_GID ((gid_t)-1)
/* For UNIX accounts not mapped to Windows accounts via winbind, Samba returns
SIDs of the form S-1-22-x-y, with x == 1 for users and x == 2 for groups,
and y == UNIX uid/gid. NFS returns no SIDs at all, but the plain UNIX
uid/gid values.
UNIX uid/gid values are mapped to Cygwin uid/gid values 0xff000000 +
unix uid/gid. This *might* collide with a posix_offset of some trusted
domain, but it's *very* unlikely. Define the mapping as macro. */
#define UNIX_POSIX_OFFSET (0xff000000)
#define UNIX_POSIX_MASK (0x00ffffff)
#define MAP_UNIX_TO_CYGWIN_ID(id) (UNIX_POSIX_OFFSET \
| ((id) & UNIX_POSIX_MASK))
#ifndef __x86_64__
#define ILLEGAL_UID16 ((__uid16_t)-1)
#define ILLEGAL_GID16 ((__gid16_t)-1)
#define uid16touid32(u16) ((u16)==ILLEGAL_UID16?ILLEGAL_UID:(uid_t)(u16))
#define gid16togid32(g16) ((g16)==ILLEGAL_GID16?ILLEGAL_GID:(gid_t)(g16))
#endif
#define MAX_SID_LEN 40
#define MAX_DACL_LEN(n) (sizeof (ACL) \
+ (n) * (sizeof (ACCESS_ALLOWED_ACE) - sizeof (DWORD) + MAX_SID_LEN))
#define SD_MIN_SIZE (sizeof (SECURITY_DESCRIPTOR) + MAX_DACL_LEN (1))
#define ACL_MAXIMUM_SIZE 65532 /* Yeah, right. 64K - sizeof (DWORD). */
#define SD_MAXIMUM_SIZE 65536
#define NO_SID ((PSID)NULL)
#ifndef SE_CREATE_TOKEN_PRIVILEGE
#define SE_CREATE_TOKEN_PRIVILEGE 2U
#define SE_ASSIGNPRIMARYTOKEN_PRIVILEGE 3U
#define SE_LOCK_MEMORY_PRIVILEGE 4U
#define SE_INCREASE_QUOTA_PRIVILEGE 5U
#define SE_MACHINE_ACCOUNT_PRIVILEGE 6U
#define SE_TCB_PRIVILEGE 7U
#define SE_SECURITY_PRIVILEGE 8U
#define SE_TAKE_OWNERSHIP_PRIVILEGE 9U
#define SE_LOAD_DRIVER_PRIVILEGE 10U
#define SE_SYSTEM_PROFILE_PRIVILEGE 11U
#define SE_SYSTEMTIME_PRIVILEGE 12U
#define SE_PROF_SINGLE_PROCESS_PRIVILEGE 13U
#define SE_INC_BASE_PRIORITY_PRIVILEGE 14U
#define SE_CREATE_PAGEFILE_PRIVILEGE 15U
#define SE_CREATE_PERMANENT_PRIVILEGE 16U
#define SE_BACKUP_PRIVILEGE 17U
#define SE_RESTORE_PRIVILEGE 18U
#define SE_SHUTDOWN_PRIVILEGE 19U
#define SE_DEBUG_PRIVILEGE 20U
#define SE_AUDIT_PRIVILEGE 21U
#define SE_SYSTEM_ENVIRONMENT_PRIVILEGE 22U
#define SE_CHANGE_NOTIFY_PRIVILEGE 23U
#define SE_REMOTE_SHUTDOWN_PRIVILEGE 24U
#define SE_UNDOCK_PRIVILEGE 25U
#define SE_SYNC_AGENT_PRIVILEGE 26U
#define SE_ENABLE_DELEGATION_PRIVILEGE 27U
#define SE_MANAGE_VOLUME_PRIVILEGE 28U
#define SE_IMPERSONATE_PRIVILEGE 29U
#define SE_CREATE_GLOBAL_PRIVILEGE 30U
/* Starting with Vista */
#define SE_TRUSTED_CREDMAN_ACCESS_PRIVILEGE 31U
#define SE_RELABEL_PRIVILEGE 32U
#define SE_INCREASE_WORKING_SET_PRIVILEGE 33U
#define SE_TIME_ZONE_PRIVILEGE 34U
#define SE_CREATE_SYMBOLIC_LINK_PRIVILEGE 35U
#define SE_MAX_WELL_KNOWN_PRIVILEGE SE_CREATE_SYMBOLIC_LINK_PRIVILEGE
#endif /* ! SE_CREATE_TOKEN_PRIVILEGE */
/* Added for debugging purposes. */
typedef struct {
BYTE Revision;
BYTE SubAuthorityCount;
SID_IDENTIFIER_AUTHORITY IdentifierAuthority;
DWORD SubAuthority[8];
} DBGSID, *PDBGSID;
/* Macro to define variable length SID structures */
#define MKSID(name, comment, authority, count, rid...) \
static NO_COPY struct { \
BYTE Revision; \
BYTE SubAuthorityCount; \
SID_IDENTIFIER_AUTHORITY IdentifierAuthority; \
DWORD SubAuthority[count]; \
} name##_struct = { SID_REVISION, count, {authority}, {rid}}; \
cygpsid NO_COPY name = (PSID) &name##_struct;
#define FILE_READ_BITS (FILE_READ_DATA | GENERIC_READ | GENERIC_ALL)
#define FILE_WRITE_BITS (FILE_WRITE_DATA | GENERIC_WRITE | GENERIC_ALL)
#define FILE_EXEC_BITS (FILE_EXECUTE | GENERIC_EXECUTE | GENERIC_ALL)
/* Convenience macros. The Windows SID access functions are crude. */
#define sid_id_auth(s) \
(RtlIdentifierAuthoritySid (s)->Value[5])
#define sid_sub_auth_count(s) \
(*RtlSubAuthorityCountSid ((s)))
#define sid_sub_auth(s,i) \
(*RtlSubAuthoritySid ((s),(i)))
#define sid_sub_auth_rid(s) \
(*RtlSubAuthoritySid ((s), (*RtlSubAuthorityCountSid ((s)) - 1)))
#ifdef __cplusplus
extern "C"
{
#endif
/* We need these declarations, otherwise g++ complains that the below
inline methods use an undefined function, if ntdll.h isn't included. */
BOOLEAN NTAPI RtlEqualSid (PSID, PSID);
NTSTATUS NTAPI RtlCopySid (ULONG, PSID, PSID);
#ifdef __cplusplus
}
#endif
class cygpsid {
protected:
PSID psid;
public:
cygpsid () {}
cygpsid (PSID nsid) { psid = nsid; }
operator PSID () const { return psid; }
const PSID operator= (PSID nsid) { return psid = nsid;}
uid_t get_id (BOOL search_grp, int *type = NULL);
int get_uid () { return get_id (FALSE); }
int get_gid () { return get_id (TRUE); }
PWCHAR pstring (PWCHAR nsidstr) const;
PWCHAR string (PWCHAR nsidstr) const;
char *pstring (char *nsidstr) const;
char *string (char *nsidstr) const;
bool operator== (const PSID nsid) const
{
if (!psid || !nsid)
return nsid == psid;
return RtlEqualSid (psid, nsid);
}
bool operator!= (const PSID nsid) const
{ return !(*this == nsid); }
bool operator== (const char *nsidstr) const;
bool operator!= (const char *nsidstr) const
{ return !(*this == nsidstr); }
void debug_print (const char *prefix = NULL) const
{
char buf[256] __attribute__ ((unused));
debug_printf ("%s %s", prefix ?: "", string (buf) ?: "NULL");
}
};
class cygsid : public cygpsid {
char sbuf[MAX_SID_LEN];
bool well_known_sid;
const PSID getfromstr (PCWSTR nsidstr, bool well_known);
const PSID getfromstr (const char *nsidstr, bool well_known);
PSID get_sid (DWORD s, DWORD cnt, DWORD *r, bool well_known);
inline const PSID assign (const PSID nsid, bool well_known)
{
if (!nsid)
psid = NO_SID;
else
{
psid = (PSID) sbuf;
RtlCopySid (MAX_SID_LEN, psid, nsid);
well_known_sid = well_known;
}
return psid;
}
public:
inline operator const PSID () { return psid; }
inline bool is_well_known_sid () { return well_known_sid; }
/* Both, = and *= are assignment operators. = creates a "normal" SID,
*= marks the SID as being a well-known SID. This difference is
important when creating a SID list for LSA authentication. */
inline const PSID operator= (cygsid &nsid)
{ return assign (nsid, nsid.well_known_sid); }
inline const PSID operator= (const PSID nsid)
{ return assign (nsid, false); }
inline const PSID operator= (PCWSTR nsidstr)
{ return getfromstr (nsidstr, false); }
inline const PSID operator= (const char *nsidstr)
{ return getfromstr (nsidstr, false); }
inline const PSID operator*= (cygsid &nsid)
{ return assign (nsid, true); }
inline const PSID operator*= (const PSID nsid)
{ return assign (nsid, true); }
inline const PSID operator*= (PCWSTR nsidstr)
{ return getfromstr (nsidstr, true); }
inline const PSID operator*= (const char *nsidstr)
{ return getfromstr (nsidstr, true); }
inline cygsid () : cygpsid ((PSID) sbuf), well_known_sid (false) {}
inline cygsid (const PSID nsid) { *this = nsid; }
inline cygsid (const char *nstrsid) { *this = nstrsid; }
inline PSID set () { return psid = (PSID) sbuf; }
BOOL getfrompw (const struct passwd *pw);
BOOL getfromgr (const struct group *gr);
void debug_print (const char *prefix = NULL) const
{
char buf[256] __attribute__ ((unused));
debug_printf ("%s %s%s", prefix ?: "", string (buf) ?: "NULL", well_known_sid ? " (*)" : " (+)");
}
};
typedef enum { cygsidlist_empty, cygsidlist_alloc, cygsidlist_auto } cygsidlist_type;
class cygsidlist {
int maxcnt;
int cnt;
BOOL add (const PSID nsi, bool well_known); /* Only with auto for now */
public:
cygsid *sids;
cygsidlist_type type;
cygsidlist (cygsidlist_type t, int m)
: maxcnt (m), cnt (0), type (t)
{
if (t == cygsidlist_alloc)
sids = alloc_sids (m);
else
sids = new cygsid [m];
}
~cygsidlist () { if (type == cygsidlist_auto) delete [] sids; }
BOOL addfromgr (struct group *gr) /* Only with alloc */
{ return sids[cnt].getfromgr (gr) && ++cnt; }
/* += adds a "normal" SID, *= adds a well-known SID. See comment in class
cygsid above. */
BOOL operator+= (cygsid &si) { return add ((PSID) si,
si.is_well_known_sid ()); }
BOOL operator+= (const char *sidstr) { cygsid nsi (sidstr);
return add ((PSID) nsi,
nsi.is_well_known_sid ());
}
BOOL operator+= (const PSID psid) { return add (psid, false); }
BOOL operator*= (cygsid &si) { return add ((PSID) si, true); }
BOOL operator*= (const char *sidstr) { cygsid nsi (sidstr);
return add ((PSID) nsi, true); }
BOOL operator*= (const PSID psid) { return add (psid, true); }
void count (int ncnt)
{ cnt = ncnt; }
int count () const { return cnt; }
int non_well_known_count () const
{
int wcnt = 0;
for (int i = 0; i < cnt; ++i)
if (!sids[i].is_well_known_sid ())
++wcnt;
return wcnt;
}
int position (const PSID sid) const
{
for (int i = 0; i < cnt; ++i)
if (sids[i] == sid)
return i;
return -1;
}
int next_non_well_known_sid (int idx)
{
while (++idx < cnt)
if (!sids[idx].is_well_known_sid ())
return idx;
return -1;
}
BOOL contains (const PSID sid) const { return position (sid) >= 0; }
cygsid *alloc_sids (int n);
void free_sids ();
void debug_print (const char *prefix = NULL) const
{
debug_printf ("-- begin sidlist ---");
if (!cnt)
debug_printf ("No elements");
for (int i = 0; i < cnt; ++i)
sids[i].debug_print (prefix);
debug_printf ("-- ende sidlist ---");
}
};
/* Wrapper class to allow simple deleting of buffer space allocated
by read_sd() */
class security_descriptor {
protected:
PSECURITY_DESCRIPTOR psd;
DWORD sd_size;
public:
security_descriptor () : psd (NULL), sd_size (0) {}
~security_descriptor () { free (); }
PSECURITY_DESCRIPTOR malloc (size_t nsize);
PSECURITY_DESCRIPTOR realloc (size_t nsize);
void free ();
inline DWORD size () const { return sd_size; }
inline DWORD copy (void *buf, DWORD buf_size) const {
if (buf_size < size ())
return sd_size;
memcpy (buf, psd, sd_size);
return 0;
}
inline operator const PSECURITY_DESCRIPTOR () { return psd; }
inline operator PSECURITY_DESCRIPTOR *() { return &psd; }
inline void operator =(PSECURITY_DESCRIPTOR nsd) { psd = nsd; }
};
class user_groups {
public:
cygsid pgsid;
cygsidlist sgsids;
BOOL ischanged;
BOOL issetgroups () const { return (sgsids.type == cygsidlist_alloc); }
void update_supp (const cygsidlist &newsids)
{
sgsids.free_sids ();
sgsids = newsids;
ischanged = TRUE;
}
void clear_supp ()
{
if (issetgroups ())
{
sgsids.free_sids ();
ischanged = TRUE;
}
}
void update_pgrp (const PSID sid)
{
pgsid = sid;
ischanged = TRUE;
}
};
extern cygpsid well_known_null_sid;
extern cygpsid well_known_world_sid;
extern cygpsid well_known_local_sid;
extern cygpsid well_known_console_logon_sid;
extern cygpsid well_known_creator_owner_sid;
extern cygpsid well_known_creator_group_sid;
extern cygpsid well_known_dialup_sid;
extern cygpsid well_known_network_sid;
extern cygpsid well_known_batch_sid;
extern cygpsid well_known_interactive_sid;
extern cygpsid well_known_service_sid;
extern cygpsid well_known_authenticated_users_sid;
extern cygpsid well_known_this_org_sid;
extern cygpsid well_known_system_sid;
extern cygpsid well_known_builtin_sid;
extern cygpsid well_known_admins_sid;
extern cygpsid well_known_users_sid;
extern cygpsid mandatory_medium_integrity_sid;
extern cygpsid mandatory_high_integrity_sid;
extern cygpsid mandatory_system_integrity_sid;
extern cygpsid well_known_samba_unix_user_fake_sid;
bool privilege_luid (const PWCHAR pname, LUID &luid, bool &high_integrity);
extern inline BOOL
well_known_sid_type (SID_NAME_USE type)
{
return type == SidTypeAlias || type == SidTypeWellKnownGroup;
}
extern inline BOOL
legal_sid_type (SID_NAME_USE type)
{
return type == SidTypeUser || type == SidTypeGroup
|| type == SidTypeAlias || type == SidTypeWellKnownGroup;
}
class path_conv;
/* File manipulation */
int __reg3 get_file_attribute (HANDLE, path_conv &, mode_t *,
uid_t *, gid_t *);
int __reg3 set_file_attribute (HANDLE, path_conv &,
uid_t, gid_t, mode_t);
int __reg2 get_object_sd (HANDLE, security_descriptor &);
int __reg3 get_object_attribute (HANDLE, uid_t *, gid_t *, mode_t *);
int __reg3 set_object_attribute (HANDLE, uid_t, gid_t, mode_t);
int __reg3 create_object_sd_from_attribute (HANDLE, uid_t, gid_t,
mode_t, security_descriptor &);
int __reg3 set_object_sd (HANDLE, security_descriptor &, bool);
int __reg3 get_reg_attribute (HKEY hkey, mode_t *, uid_t *, gid_t *);
LONG __reg3 get_file_sd (HANDLE fh, path_conv &, security_descriptor &, bool);
LONG __reg3 set_file_sd (HANDLE fh, path_conv &, security_descriptor &, bool);
bool __reg3 add_access_allowed_ace (PACL, int, DWORD, PSID, size_t &, DWORD);
bool __reg3 add_access_denied_ace (PACL, int, DWORD, PSID, size_t &, DWORD);
int __reg3 check_file_access (path_conv &, int, bool);
int __reg3 check_registry_access (HANDLE, int, bool);
void set_security_attribute (path_conv &pc, int attribute,
PSECURITY_ATTRIBUTES psa,
security_descriptor &sd_buf);
bool get_sids_info (cygpsid, cygpsid, uid_t * , gid_t *);
/* sec_acl.cc */
struct acl;
extern "C" int aclsort32 (int, int, struct acl *);
extern "C" int acl32 (const char *, int, int, struct acl *);
int getacl (HANDLE, path_conv &, int, struct acl *);
int setacl (HANDLE, path_conv &, int, struct acl *, bool &);
/* Set impersonation or restricted token. */
void set_imp_token (HANDLE token, int type);
/* Function creating a token by calling NtCreateToken. */
HANDLE create_token (cygsid &usersid, user_groups &groups, struct passwd * pw);
/* LSA authentication function. */
HANDLE lsaauth (cygsid &, user_groups &, struct passwd *);
/* LSA private key storage authentication, same as when using service logons. */
HANDLE lsaprivkeyauth (struct passwd *pw);
/* Verify an existing token */
bool verify_token (HANDLE token, cygsid &usersid, user_groups &groups, bool *pintern = NULL);
/* Get groups of a user */
bool get_server_groups (cygsidlist &grp_list, PSID usersid, struct passwd *pw);
/* Extract U-domain\user field from passwd entry. */
void extract_nt_dom_user (const struct passwd *pw, PWCHAR domain, PWCHAR user);
/* Get default logonserver for a domain. */
bool get_logon_server (PWCHAR domain, PWCHAR wserver, ULONG flags);
HANDLE lsa_open_policy (PWCHAR server, ACCESS_MASK access);
void lsa_close_policy (HANDLE lsa);
/* sec_helper.cc: Security helper functions. */
int set_privilege (HANDLE token, DWORD privilege, bool enable);
void set_cygwin_privileges (HANDLE token);
#define _push_thread_privilege(_priv, _val, _check) { \
HANDLE _dup_token = NULL; \
HANDLE _token = (cygheap->user.issetuid () && (_check)) \
? cygheap->user.primary_token () : hProcToken; \
if (!DuplicateTokenEx (_token, MAXIMUM_ALLOWED, NULL, \
SecurityImpersonation, TokenImpersonation, \
&_dup_token)) \
debug_printf ("DuplicateTokenEx: %E"); \
else if (!ImpersonateLoggedOnUser (_dup_token)) \
debug_printf ("ImpersonateLoggedOnUser: %E"); \
else \
set_privilege (_dup_token, (_priv), (_val));
#define push_thread_privilege(_priv, _val) _push_thread_privilege(_priv,_val,1)
#define push_self_privilege(_priv, _val) _push_thread_privilege(_priv,_val,0)
#define pop_thread_privilege() \
if (_dup_token) \
{ \
if (!cygheap->user.issetuid ()) \
RevertToSelf (); \
else \
cygheap->user.reimpersonate (); \
CloseHandle (_dup_token); \
} \
}
#define pop_self_privilege() pop_thread_privilege()
/* shared.cc: */
/* Various types of security attributes for use in Create* functions. */
extern SECURITY_ATTRIBUTES sec_none, sec_none_nih, sec_all, sec_all_nih;
extern SECURITY_ATTRIBUTES *__reg3 __sec_user (PVOID, PSID, PSID,
DWORD, BOOL);
extern PSECURITY_DESCRIPTOR _recycler_sd (void *buf, bool users, bool dir);
#define recycler_sd(users,dir) \
(_recycler_sd (alloca (sizeof (SECURITY_DESCRIPTOR) + MAX_DACL_LEN (3)), \
(users), \
(dir)))
extern PSECURITY_DESCRIPTOR _everyone_sd (void *buf, ACCESS_MASK access);
#define everyone_sd(access) (_everyone_sd (alloca (SD_MIN_SIZE), (access)))
#define sec_none_cloexec(f) (((f) & O_CLOEXEC ? &sec_none_nih : &sec_none))
extern bool sec_acl (PACL acl, bool original, bool admins, PSID sid1 = NO_SID,
PSID sid2 = NO_SID, DWORD access2 = 0);
ssize_t __reg3 read_ea (HANDLE, path_conv &, const char *,
char *, size_t);
int __reg3 write_ea (HANDLE, path_conv &, const char *, const char *,
size_t, int);
/* Note: sid1 is usually (read: currently always) the current user's
effective sid (cygheap->user.sid ()). */
extern inline SECURITY_ATTRIBUTES *
sec_user_nih (SECURITY_ATTRIBUTES *sa_buf, PSID sid1, PSID sid2 = NULL,
DWORD access2 = 0)
{
return __sec_user (sa_buf, sid1, sid2, access2, FALSE);
}
extern inline SECURITY_ATTRIBUTES *
sec_user (SECURITY_ATTRIBUTES *sa_buf, PSID sid1, PSID sid2 = NULL,
DWORD access2 = 0)
{
return __sec_user (sa_buf, sid1, sid2, access2, TRUE);
}
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