newlib/winsup/cygwin/security.h

398 lines
12 KiB
C++

/* security.h: security declarations
Copyright 2000, 2001, 2002, 2003, 2004, 2005 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. */
#ifndef _SECURITY_H
#define _SECURITY_H
#include <accctrl.h>
#define DEFAULT_UID DOMAIN_USER_RID_ADMIN
#define UNKNOWN_UID 400 /* Non conflicting number */
#define UNKNOWN_GID 401
#define MAX_SID_LEN 40
#define MAX_DACL_LEN(n) (sizeof (ACL) \
+ (n) * (sizeof (ACCESS_ALLOWED_ACE) - sizeof (DWORD) + MAX_SID_LEN))
#define ACL_DEFAULT_SIZE 3072
#define NO_SID ((PSID)NULL)
/* Macro to define variable length SID structures */
#define SID(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)
class cygpsid {
protected:
PSID psid;
public:
cygpsid () {}
cygpsid (PSID nsid) { psid = nsid; }
operator const PSID () { return psid; }
const PSID operator= (PSID nsid) { return psid = nsid;}
__uid32_t get_id (BOOL search_grp, int *type = NULL);
int get_uid () { return get_id (FALSE); }
int get_gid () { return get_id (TRUE); }
char *string (char *nsidstr) const;
bool operator== (const PSID nsid) const
{
if (!psid || !nsid)
return nsid == psid;
return EqualSid (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];
const PSID getfromstr (const char *nsidstr);
PSID get_sid (DWORD s, DWORD cnt, DWORD *r);
inline const PSID assign (const PSID nsid)
{
if (!nsid)
psid = NO_SID;
else
{
psid = (PSID) sbuf;
CopySid (MAX_SID_LEN, psid, nsid);
}
return psid;
}
public:
inline operator const PSID () { return psid; }
inline const PSID operator= (cygsid &nsid)
{ return assign (nsid); }
inline const PSID operator= (const PSID nsid)
{ return assign (nsid); }
inline const PSID operator= (const char *nsidstr)
{ return getfromstr (nsidstr); }
inline cygsid () : cygpsid ((PSID) sbuf) {}
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 __group32 *gr);
};
typedef enum { cygsidlist_empty, cygsidlist_alloc, cygsidlist_auto } cygsidlist_type;
class cygsidlist {
int maxcount;
public:
int count;
cygsid *sids;
cygsidlist_type type;
cygsidlist (cygsidlist_type t, int m)
{
type = t;
count = 0;
maxcount = m;
if (t == cygsidlist_alloc)
sids = alloc_sids (m);
else
sids = new cygsid [m];
}
~cygsidlist () { if (type == cygsidlist_auto) delete [] sids; }
BOOL add (const PSID nsi) /* Only with auto for now */
{
if (count >= maxcount)
{
cygsid *tmp = new cygsid [ 2 * maxcount];
if (!tmp)
return FALSE;
maxcount *= 2;
for (int i = 0; i < count; ++i)
tmp[i] = sids[i];
delete [] sids;
sids = tmp;
}
sids[count++] = nsi;
return TRUE;
}
BOOL add (cygsid &nsi) { return add ((PSID) nsi); }
BOOL add (const char *sidstr)
{ cygsid nsi (sidstr); return add (nsi); }
BOOL addfromgr (struct __group32 *gr) /* Only with alloc */
{ return sids[count].getfromgr (gr) && ++count; }
BOOL operator+= (cygsid &si) { return add (si); }
BOOL operator+= (const char *sidstr) { return add (sidstr); }
BOOL operator+= (const PSID psid) { return add (psid); }
int position (const PSID sid) const
{
for (int i = 0; i < count; ++i)
if (sids[i] == sid)
return i;
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 (!count)
debug_printf ("No elements");
for (int i = 0; i < count; ++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 (void);
inline DWORD size (void) const { return sd_size; }
inline operator const PSECURITY_DESCRIPTOR () { return psd; }
};
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_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_system_sid;
extern cygpsid well_known_admins_sid;
/* Order must be same as cygpriv in sec_helper.cc. */
enum cygpriv_idx {
SE_CREATE_TOKEN_PRIV = 0,
SE_ASSIGNPRIMARYTOKEN_PRIV,
SE_LOCK_MEMORY_PRIV,
SE_INCREASE_QUOTA_PRIV,
SE_UNSOLICITED_INPUT_PRIV,
SE_MACHINE_ACCOUNT_PRIV,
SE_TCB_PRIV,
SE_SECURITY_PRIV,
SE_TAKE_OWNERSHIP_PRIV,
SE_LOAD_DRIVER_PRIV,
SE_SYSTEM_PROFILE_PRIV,
SE_SYSTEMTIME_PRIV,
SE_PROF_SINGLE_PROCESS_PRIV,
SE_INC_BASE_PRIORITY_PRIV,
SE_CREATE_PAGEFILE_PRIV,
SE_CREATE_PERMANENT_PRIV,
SE_BACKUP_PRIV,
SE_RESTORE_PRIV,
SE_SHUTDOWN_PRIV,
SE_DEBUG_PRIV,
SE_AUDIT_PRIV,
SE_SYSTEM_ENVIRONMENT_PRIV,
SE_CHANGE_NOTIFY_PRIV,
SE_REMOTE_SHUTDOWN_PRIV,
SE_CREATE_GLOBAL_PRIV,
SE_UNDOCK_PRIV,
SE_MANAGE_VOLUME_PRIV,
SE_IMPERSONATE_PRIV,
SE_ENABLE_DELEGATION_PRIV,
SE_SYNC_AGENT_PRIV,
SE_NUM_PRIVS
};
const LUID *privilege_luid (enum cygpriv_idx idx);
const LUID *privilege_luid_by_name (const char *pname);
const char *privilege_name (enum cygpriv_idx idx);
inline BOOL
legal_sid_type (SID_NAME_USE type)
{
return type == SidTypeUser || type == SidTypeGroup
|| type == SidTypeAlias || type == SidTypeWellKnownGroup;
}
extern bool allow_ntea;
extern bool allow_ntsec;
extern bool allow_smbntsec;
extern bool allow_traverse;
/* File manipulation */
int __stdcall get_file_attribute (int, HANDLE, const char *, mode_t *,
__uid32_t * = NULL, __gid32_t * = NULL);
int __stdcall set_file_attribute (bool, HANDLE, const char *, int);
int __stdcall set_file_attribute (bool, HANDLE, const char *, __uid32_t, __gid32_t, int);
int __stdcall get_nt_object_security (HANDLE, SE_OBJECT_TYPE,
security_descriptor &);
int __stdcall get_object_attribute (HANDLE handle, SE_OBJECT_TYPE object_type, mode_t *,
__uid32_t * = NULL, __gid32_t * = NULL);
LONG __stdcall read_sd (const char *file, security_descriptor &sd);
LONG __stdcall write_sd (HANDLE fh, const char *file, security_descriptor &sd);
bool __stdcall add_access_allowed_ace (PACL acl, int offset, DWORD attributes, PSID sid, size_t &len_add, DWORD inherit);
bool __stdcall add_access_denied_ace (PACL acl, int offset, DWORD attributes, PSID sid, size_t &len_add, DWORD inherit);
int __stdcall check_file_access (const char *, int);
void set_security_attribute (int attribute, PSECURITY_ATTRIBUTES psa,
security_descriptor &sd_buf);
bool get_sids_info (cygpsid, cygpsid, __uid32_t * , __gid32_t *);
/* sec_acl.cc */
struct __acl32;
extern "C" int aclsort32 (int, int, __acl32 *);
extern "C" int acl32 (const char *, int, int, __acl32 *);
int getacl (HANDLE, const char *, DWORD, int, __acl32 *);
int setacl (HANDLE, const char *, int, __acl32 *);
struct _UNICODE_STRING;
void __stdcall str2buf2uni (_UNICODE_STRING &, WCHAR *, const char *) __attribute__ ((regparm (3)));
void __stdcall str2uni_cat (_UNICODE_STRING &, const char *) __attribute__ ((regparm (2)));
/* Try a subauthentication. */
HANDLE subauth (struct passwd *pw);
/* Try creating a token directly. */
HANDLE create_token (cygsid &usersid, user_groups &groups, 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, char *domain, char *user);
/* Get default logonserver for a domain. */
bool get_logon_server (const char * domain, char * server, WCHAR *wserver = NULL);
/* sec_helper.cc: Security helper functions. */
int set_privilege (HANDLE token, enum cygpriv_idx privilege, bool enable);
void set_cygwin_privileges (HANDLE token);
#define set_process_privilege(p,v) set_privilege (hProcImpToken, (p), (v))
#define _push_thread_privilege(_priv, _val, _check) { \
HANDLE _token = NULL, _dup_token = NULL; \
if (wincap.has_security ()) \
{ \
_token = (cygheap->user.issetuid () && (_check)) \
? cygheap->user.token () : hProcImpToken; \
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) \
{ \
ImpersonateLoggedOnUser (_token); \
CloseHandle (_dup_token); \
} \
}
#define pop_self_privilege() pop_thread_privilege()
/* shared.cc: */
/* Retrieve a security descriptor that allows all access */
SECURITY_DESCRIPTOR *__stdcall get_null_sd (void);
/* 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 *__stdcall __sec_user (PVOID sa_buf, PSID sid1, PSID sid2,
DWORD access2, BOOL inherit)
__attribute__ ((regparm (3)));
extern bool sec_acl (PACL acl, bool original, bool admins, PSID sid1 = NO_SID,
PSID sid2 = NO_SID, DWORD access2 = 0);
int __stdcall NTReadEA (const char *file, const char *attrname, char *buf, int len);
BOOL __stdcall NTWriteEA (const char *file, const char *attrname, const char *buf, int len);
extern inline SECURITY_ATTRIBUTES *
sec_user_nih (SECURITY_ATTRIBUTES *sa_buf, PSID sid1 = NULL, 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 = NULL, PSID sid2 = NULL,
DWORD access2 = 0)
{
return __sec_user (sa_buf, sid1, sid2, access2, TRUE);
}
#endif /*_SECURITY_H*/