/* security.h: security declarations Copyright 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009 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 #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 SD_MIN_SIZE (sizeof (SECURITY_DESCRIPTOR) + MAX_DACL_LEN (1)) #define ACL_DEFAULT_SIZE 3072 #define NO_SID ((PSID)NULL) #ifndef SE_CREATE_TOKEN_PRIVILEGE #define SE_CREATE_TOKEN_PRIVILEGE 2UL #define SE_ASSIGNPRIMARYTOKEN_PRIVILEGE 3UL #define SE_LOCK_MEMORY_PRIVILEGE 4UL #define SE_INCREASE_QUOTA_PRIVILEGE 5UL #define SE_MACHINE_ACCOUNT_PRIVILEGE 6UL #define SE_TCB_PRIVILEGE 7UL #define SE_SECURITY_PRIVILEGE 8UL #define SE_TAKE_OWNERSHIP_PRIVILEGE 9UL #define SE_LOAD_DRIVER_PRIVILEGE 10UL #define SE_SYSTEM_PROFILE_PRIVILEGE 11UL #define SE_SYSTEMTIME_PRIVILEGE 12UL #define SE_PROF_SINGLE_PROCESS_PRIVILEGE 13UL #define SE_INC_BASE_PRIORITY_PRIVILEGE 14UL #define SE_CREATE_PAGEFILE_PRIVILEGE 15UL #define SE_CREATE_PERMANENT_PRIVILEGE 16UL #define SE_BACKUP_PRIVILEGE 17UL #define SE_RESTORE_PRIVILEGE 18UL #define SE_SHUTDOWN_PRIVILEGE 19UL #define SE_DEBUG_PRIVILEGE 20UL #define SE_AUDIT_PRIVILEGE 21UL #define SE_SYSTEM_ENVIRONMENT_PRIVILEGE 22UL #define SE_CHANGE_NOTIFY_PRIVILEGE 23UL #define SE_REMOTE_SHUTDOWN_PRIVILEGE 24UL /* Starting with Windows 2000 */ #define SE_UNDOCK_PRIVILEGE 25UL #define SE_SYNC_AGENT_PRIVILEGE 26UL #define SE_ENABLE_DELEGATION_PRIVILEGE 27UL #define SE_MANAGE_VOLUME_PRIVILEGE 28UL /* Starting with Windows 2000 SP4, XP SP2, 2003 Server */ #define SE_IMPERSONATE_PRIVILEGE 29UL #define SE_CREATE_GLOBAL_PRIVILEGE 30UL /* Starting with Vista */ #define SE_TRUSTED_CREDMAN_ACCESS_PRIVILEGE 31UL #define SE_RELABEL_PRIVILEGE 32UL #define SE_INCREASE_WORKING_SET_PRIVILEGE 33UL #define SE_TIME_ZONE_PRIVILEGE 34UL #define SE_CREATE_SYMBOLIC_LINK_PRIVILEGE 35UL #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) 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;} __uid32_t get_id (BOOL search_grp, int *type = NULL); int get_uid () { return get_id (FALSE); } int get_gid () { return get_id (TRUE); } PWCHAR string (PWCHAR nsidstr) const; 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]; bool well_known_sid; 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; CopySid (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= (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*= (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 __group32 *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 __group32 *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, false); } BOOL operator+= (const char *sidstr) { cygsid nsi (sidstr); return add ((PSID) nsi, false); } 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; } }; 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_this_org_sid; extern cygpsid well_known_system_sid; extern cygpsid well_known_admins_sid; extern cygpsid fake_logon_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); inline BOOL legal_sid_type (SID_NAME_USE type) { return type == SidTypeUser || type == SidTypeGroup || type == SidTypeAlias || type == SidTypeWellKnownGroup; } class path_conv; /* File manipulation */ int __stdcall get_file_attribute (HANDLE, path_conv &, mode_t *, __uid32_t *, __gid32_t *); int __stdcall set_file_attribute (HANDLE, path_conv &, __uid32_t, __gid32_t, int); int __stdcall get_reg_attribute (HKEY hkey, mode_t *, __uid32_t *, __gid32_t *); LONG __stdcall get_file_sd (HANDLE fh, path_conv &, security_descriptor &sd); LONG __stdcall set_file_sd (HANDLE fh, path_conv &, security_descriptor &sd, bool is_chown); 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 (path_conv &, int); int __stdcall check_registry_access (HANDLE, int); void set_security_attribute (path_conv &pc, 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, path_conv &, int, __acl32 *); int setacl (HANDLE, path_conv &, int, __acl32 *, bool &); struct _UNICODE_STRING; void __stdcall str2uni_cat (_UNICODE_STRING &, const char *) __attribute__ ((regparm (2))); /* 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, bool rediscovery); HANDLE open_local_policy (ACCESS_MASK access); /* 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: */ /* Retrieve a security descriptor that allows all access */ SECURITY_DESCRIPTOR *__stdcall get_null_sd (); /* 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 PSECURITY_DESCRIPTOR _everyone_sd (void *buf, ACCESS_MASK access); #define everyone_sd(access) (_everyone_sd (alloca (SD_MIN_SIZE), (access))) extern bool sec_acl (PACL acl, bool original, bool admins, PSID sid1 = NO_SID, PSID sid2 = NO_SID, DWORD access2 = 0); ssize_t __stdcall read_ea (HANDLE hdl, path_conv &pc, const char *name, char *value, size_t size); int __stdcall write_ea (HANDLE hdl, path_conv &pc, const char *name, const char *value, size_t size, int flags); /* 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); } #endif /*_SECURITY_H*/