/* 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 #include /* 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 cygsid (cygsid &nsid) { *this = nsid; } 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); }