453 lines
14 KiB
C++
453 lines
14 KiB
C++
/* security.h: security declarations
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Copyright 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007 Red Hat, Inc.
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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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#ifndef _SECURITY_H
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#define _SECURITY_H
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#include <accctrl.h>
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#define DEFAULT_UID DOMAIN_USER_RID_ADMIN
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#define UNKNOWN_UID 400 /* Non conflicting number */
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#define UNKNOWN_GID 401
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#define MAX_SID_LEN 40
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#define MAX_DACL_LEN(n) (sizeof (ACL) \
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+ (n) * (sizeof (ACCESS_ALLOWED_ACE) - sizeof (DWORD) + MAX_SID_LEN))
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#define ACL_DEFAULT_SIZE 3072
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#define NO_SID ((PSID)NULL)
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/* Added for debugging purposes. */
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typedef struct {
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BYTE Revision;
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BYTE SubAuthorityCount;
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SID_IDENTIFIER_AUTHORITY IdentifierAuthority;
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DWORD SubAuthority[8];
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} DBGSID, *PDBGSID;
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/* Macro to define variable length SID structures */
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#define MKSID(name, comment, authority, count, rid...) \
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static NO_COPY struct { \
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BYTE Revision; \
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BYTE SubAuthorityCount; \
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SID_IDENTIFIER_AUTHORITY IdentifierAuthority; \
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DWORD SubAuthority[count]; \
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} name##_struct = { SID_REVISION, count, {authority}, {rid}}; \
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cygpsid NO_COPY name = (PSID) &name##_struct;
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#define FILE_READ_BITS (FILE_READ_DATA | GENERIC_READ | GENERIC_ALL)
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#define FILE_WRITE_BITS (FILE_WRITE_DATA | GENERIC_WRITE | GENERIC_ALL)
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#define FILE_EXEC_BITS (FILE_EXECUTE | GENERIC_EXECUTE | GENERIC_ALL)
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class cygpsid {
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protected:
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PSID psid;
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public:
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cygpsid () {}
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cygpsid (PSID nsid) { psid = nsid; }
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operator PSID () const { return psid; }
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const PSID operator= (PSID nsid) { return psid = nsid;}
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__uid32_t get_id (BOOL search_grp, int *type = NULL);
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int get_uid () { return get_id (FALSE); }
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int get_gid () { return get_id (TRUE); }
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char *string (char *nsidstr) const;
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bool operator== (const PSID nsid) const
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{
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if (!psid || !nsid)
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return nsid == psid;
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return EqualSid (psid, nsid);
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}
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bool operator!= (const PSID nsid) const
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{ return !(*this == nsid); }
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bool operator== (const char *nsidstr) const;
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bool operator!= (const char *nsidstr) const
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{ return !(*this == nsidstr); }
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void debug_print (const char *prefix = NULL) const
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{
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char buf[256] __attribute__ ((unused));
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debug_printf ("%s %s", prefix ?: "", string (buf) ?: "NULL");
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}
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};
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class cygsid : public cygpsid {
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char sbuf[MAX_SID_LEN];
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bool well_known_sid;
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const PSID getfromstr (const char *nsidstr, bool well_known);
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PSID get_sid (DWORD s, DWORD cnt, DWORD *r, bool well_known);
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inline const PSID assign (const PSID nsid, bool well_known)
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{
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if (!nsid)
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psid = NO_SID;
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else
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{
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psid = (PSID) sbuf;
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CopySid (MAX_SID_LEN, psid, nsid);
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well_known_sid = well_known;
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}
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return psid;
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}
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public:
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inline operator const PSID () { return psid; }
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inline bool is_well_known_sid () { return well_known_sid; }
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/* Both, = and *= are assignment operators. = creates a "normal" SID,
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*= marks the SID as being a well-known SID. This difference is
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important when creating a SID list for LSA authentication. */
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inline const PSID operator= (cygsid &nsid)
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{ return assign (nsid, nsid.well_known_sid); }
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inline const PSID operator= (const PSID nsid)
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{ return assign (nsid, false); }
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inline const PSID operator= (const char *nsidstr)
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{ return getfromstr (nsidstr, false); }
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inline const PSID operator*= (cygsid &nsid)
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{ return assign (nsid, true); }
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inline const PSID operator*= (const PSID nsid)
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{ return assign (nsid, true); }
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inline const PSID operator*= (const char *nsidstr)
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{ return getfromstr (nsidstr, true); }
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inline cygsid () : cygpsid ((PSID) sbuf), well_known_sid (false) {}
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inline cygsid (const PSID nsid) { *this = nsid; }
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inline cygsid (const char *nstrsid) { *this = nstrsid; }
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inline PSID set () { return psid = (PSID) sbuf; }
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BOOL getfrompw (const struct passwd *pw);
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BOOL getfromgr (const struct __group32 *gr);
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void debug_print (const char *prefix = NULL) const
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{
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char buf[256] __attribute__ ((unused));
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debug_printf ("%s %s%s", prefix ?: "", string (buf) ?: "NULL", well_known_sid ? " (*)" : " (+)");
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}
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};
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typedef enum { cygsidlist_empty, cygsidlist_alloc, cygsidlist_auto } cygsidlist_type;
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class cygsidlist {
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int maxcnt;
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int cnt;
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BOOL add (const PSID nsi, bool well_known); /* Only with auto for now */
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public:
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cygsid *sids;
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cygsidlist_type type;
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cygsidlist (cygsidlist_type t, int m)
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: maxcnt (m), cnt (0), type (t)
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{
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if (t == cygsidlist_alloc)
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sids = alloc_sids (m);
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else
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sids = new cygsid [m];
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}
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~cygsidlist () { if (type == cygsidlist_auto) delete [] sids; }
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BOOL addfromgr (struct __group32 *gr) /* Only with alloc */
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{ return sids[cnt].getfromgr (gr) && ++cnt; }
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/* += adds a "normal" SID, *= adds a well-known SID. See comment in class
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cygsid above. */
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BOOL operator+= (cygsid &si) { return add ((PSID) si, false); }
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BOOL operator+= (const char *sidstr) { cygsid nsi (sidstr);
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return add ((PSID) nsi, false); }
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BOOL operator+= (const PSID psid) { return add (psid, false); }
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BOOL operator*= (cygsid &si) { return add ((PSID) si, true); }
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BOOL operator*= (const char *sidstr) { cygsid nsi (sidstr);
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return add ((PSID) nsi, true); }
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BOOL operator*= (const PSID psid) { return add (psid, true); }
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void count (int ncnt)
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{ cnt = ncnt; }
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int count () const { return cnt; }
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int non_well_known_count () const
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{
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int wcnt = 0;
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for (int i = 0; i < cnt; ++i)
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if (!sids[i].is_well_known_sid ())
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++wcnt;
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return wcnt;
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}
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int position (const PSID sid) const
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{
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for (int i = 0; i < cnt; ++i)
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if (sids[i] == sid)
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return i;
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return -1;
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}
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int next_non_well_known_sid (int idx)
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{
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while (++idx < cnt)
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if (!sids[idx].is_well_known_sid ())
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return idx;
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return -1;
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}
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BOOL contains (const PSID sid) const { return position (sid) >= 0; }
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cygsid *alloc_sids (int n);
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void free_sids ();
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void debug_print (const char *prefix = NULL) const
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{
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debug_printf ("-- begin sidlist ---");
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if (!cnt)
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debug_printf ("No elements");
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for (int i = 0; i < cnt; ++i)
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sids[i].debug_print (prefix);
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debug_printf ("-- ende sidlist ---");
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}
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};
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/* Wrapper class to allow simple deleting of buffer space allocated
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by read_sd() */
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class security_descriptor {
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protected:
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PSECURITY_DESCRIPTOR psd;
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DWORD sd_size;
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public:
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security_descriptor () : psd (NULL), sd_size (0) {}
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~security_descriptor () { free (); }
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PSECURITY_DESCRIPTOR malloc (size_t nsize);
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PSECURITY_DESCRIPTOR realloc (size_t nsize);
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void free ();
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inline DWORD size () const { return sd_size; }
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inline DWORD copy (void *buf, DWORD buf_size) const {
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if (buf_size < size ())
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return sd_size;
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memcpy (buf, psd, sd_size);
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return 0;
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}
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inline operator const PSECURITY_DESCRIPTOR () { return psd; }
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inline operator PSECURITY_DESCRIPTOR *() { return &psd; }
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};
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class user_groups {
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public:
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cygsid pgsid;
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cygsidlist sgsids;
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BOOL ischanged;
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BOOL issetgroups () const { return (sgsids.type == cygsidlist_alloc); }
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void update_supp (const cygsidlist &newsids)
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{
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sgsids.free_sids ();
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sgsids = newsids;
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ischanged = TRUE;
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}
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void clear_supp ()
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{
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if (issetgroups ())
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{
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sgsids.free_sids ();
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ischanged = TRUE;
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}
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}
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void update_pgrp (const PSID sid)
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{
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pgsid = sid;
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ischanged = TRUE;
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}
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};
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extern cygpsid well_known_null_sid;
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extern cygpsid well_known_world_sid;
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extern cygpsid well_known_local_sid;
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extern cygpsid well_known_creator_owner_sid;
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extern cygpsid well_known_creator_group_sid;
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extern cygpsid well_known_dialup_sid;
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extern cygpsid well_known_network_sid;
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extern cygpsid well_known_batch_sid;
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extern cygpsid well_known_interactive_sid;
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extern cygpsid well_known_service_sid;
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extern cygpsid well_known_authenticated_users_sid;
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extern cygpsid well_known_this_org_sid;
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extern cygpsid well_known_system_sid;
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extern cygpsid well_known_admins_sid;
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extern cygpsid fake_logon_sid;
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/* Order must be same as cygpriv in sec_helper.cc. */
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enum cygpriv_idx {
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SE_CREATE_TOKEN_PRIV = 0,
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SE_ASSIGNPRIMARYTOKEN_PRIV,
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SE_LOCK_MEMORY_PRIV,
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SE_INCREASE_QUOTA_PRIV,
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SE_UNSOLICITED_INPUT_PRIV,
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SE_MACHINE_ACCOUNT_PRIV,
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SE_TCB_PRIV,
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SE_SECURITY_PRIV,
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SE_TAKE_OWNERSHIP_PRIV,
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SE_LOAD_DRIVER_PRIV,
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SE_SYSTEM_PROFILE_PRIV,
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SE_SYSTEMTIME_PRIV,
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SE_PROF_SINGLE_PROCESS_PRIV,
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SE_INC_BASE_PRIORITY_PRIV,
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SE_CREATE_PAGEFILE_PRIV,
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SE_CREATE_PERMANENT_PRIV,
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SE_BACKUP_PRIV,
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SE_RESTORE_PRIV,
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SE_SHUTDOWN_PRIV,
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SE_DEBUG_PRIV,
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SE_AUDIT_PRIV,
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SE_SYSTEM_ENVIRONMENT_PRIV,
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SE_CHANGE_NOTIFY_PRIV,
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SE_REMOTE_SHUTDOWN_PRIV,
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SE_CREATE_GLOBAL_PRIV,
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SE_UNDOCK_PRIV,
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SE_MANAGE_VOLUME_PRIV,
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SE_IMPERSONATE_PRIV,
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SE_ENABLE_DELEGATION_PRIV,
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SE_SYNC_AGENT_PRIV,
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SE_RELABEL_PRIV,
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SE_INCREASE_WORKING_SET_PRIV,
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SE_TIME_ZONE_PRIV,
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SE_CREATE_SYMBOLIC_LINK_PRIV,
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SE_NUM_PRIVS
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};
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const LUID *privilege_luid (enum cygpriv_idx idx);
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const LUID *privilege_luid_by_name (const char *pname);
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const char *privilege_name (enum cygpriv_idx idx);
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inline BOOL
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legal_sid_type (SID_NAME_USE type)
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{
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return type == SidTypeUser || type == SidTypeGroup
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|| type == SidTypeAlias || type == SidTypeWellKnownGroup;
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}
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extern bool allow_ntea;
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extern bool allow_ntsec;
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extern bool allow_smbntsec;
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/* File manipulation */
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int __stdcall get_file_attribute (int, HANDLE, const char *, mode_t *,
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__uid32_t * = NULL, __gid32_t * = NULL);
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int __stdcall set_file_attribute (bool, HANDLE, const char *, int);
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int __stdcall set_file_attribute (bool, HANDLE, const char *, __uid32_t, __gid32_t, int);
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int __stdcall get_nt_object_security (HANDLE, SE_OBJECT_TYPE,
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security_descriptor &);
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int __stdcall get_object_attribute (HANDLE handle, SE_OBJECT_TYPE object_type, mode_t *,
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__uid32_t * = NULL, __gid32_t * = NULL);
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LONG __stdcall read_sd (const char *file, security_descriptor &sd);
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LONG __stdcall write_sd (HANDLE fh, const char *file, security_descriptor &sd);
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bool __stdcall add_access_allowed_ace (PACL acl, int offset, DWORD attributes, PSID sid, size_t &len_add, DWORD inherit);
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bool __stdcall add_access_denied_ace (PACL acl, int offset, DWORD attributes, PSID sid, size_t &len_add, DWORD inherit);
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int __stdcall check_file_access (const char *, int);
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int __stdcall check_registry_access (HANDLE, int);
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void set_security_attribute (int attribute, PSECURITY_ATTRIBUTES psa,
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security_descriptor &sd_buf);
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bool get_sids_info (cygpsid, cygpsid, __uid32_t * , __gid32_t *);
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/* sec_acl.cc */
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struct __acl32;
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extern "C" int aclsort32 (int, int, __acl32 *);
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extern "C" int acl32 (const char *, int, int, __acl32 *);
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int getacl (HANDLE, const char *, DWORD, int, __acl32 *);
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int setacl (HANDLE, const char *, int, __acl32 *, bool &);
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struct _UNICODE_STRING;
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void __stdcall str2buf2uni (_UNICODE_STRING &, WCHAR *, const char *) __attribute__ ((regparm (3)));
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void __stdcall str2uni_cat (_UNICODE_STRING &, const char *) __attribute__ ((regparm (2)));
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/* Function creating a token by calling NtCreateToken. */
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HANDLE create_token (cygsid &usersid, user_groups &groups, struct passwd * pw);
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/* LSA authentication function. */
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HANDLE lsaauth (cygsid &, user_groups &, struct passwd *);
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/* Verify an existing token */
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bool verify_token (HANDLE token, cygsid &usersid, user_groups &groups, bool *pintern = NULL);
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/* Get groups of a user */
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bool get_server_groups (cygsidlist &grp_list, PSID usersid, struct passwd *pw);
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/* Extract U-domain\user field from passwd entry. */
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void extract_nt_dom_user (const struct passwd *pw, char *domain, char *user);
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/* Get default logonserver for a domain. */
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bool get_logon_server (const char * domain, char * server, WCHAR *wserver,
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bool rediscovery);
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/* sec_helper.cc: Security helper functions. */
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int set_privilege (HANDLE token, enum cygpriv_idx privilege, bool enable);
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void set_cygwin_privileges (HANDLE token);
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#define set_process_privilege(p,v) set_privilege (hProcToken, (p), (v))
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#define _push_thread_privilege(_priv, _val, _check) { \
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HANDLE _token = NULL, _dup_token = NULL; \
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if (wincap.has_security ()) \
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{ \
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_token = (cygheap->user.issetuid () && (_check)) \
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? cygheap->user.token () : hProcToken; \
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if (!DuplicateTokenEx (_token, MAXIMUM_ALLOWED, NULL, \
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SecurityImpersonation, TokenImpersonation, \
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&_dup_token)) \
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debug_printf ("DuplicateTokenEx: %E"); \
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else if (!ImpersonateLoggedOnUser (_dup_token)) \
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debug_printf ("ImpersonateLoggedOnUser: %E"); \
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else \
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set_privilege (_dup_token, (_priv), (_val)); \
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}
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#define push_thread_privilege(_priv, _val) _push_thread_privilege(_priv,_val,1)
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#define push_self_privilege(_priv, _val) _push_thread_privilege(_priv,_val,0)
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#define pop_thread_privilege() \
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if (_dup_token) \
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{ \
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if (!cygheap->user.issetuid ()) \
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RevertToSelf (); \
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else \
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cygheap->user.reimpersonate (); \
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CloseHandle (_dup_token); \
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} \
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}
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#define pop_self_privilege() pop_thread_privilege()
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/* shared.cc: */
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/* Retrieve a security descriptor that allows all access */
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SECURITY_DESCRIPTOR *__stdcall get_null_sd ();
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/* Various types of security attributes for use in Create* functions. */
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extern SECURITY_ATTRIBUTES sec_none, sec_none_nih, sec_all, sec_all_nih;
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extern SECURITY_ATTRIBUTES *__stdcall __sec_user (PVOID sa_buf, PSID sid1, PSID sid2,
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DWORD access2, BOOL inherit)
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__attribute__ ((regparm (3)));
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extern bool sec_acl (PACL acl, bool original, bool admins, PSID sid1 = NO_SID,
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PSID sid2 = NO_SID, DWORD access2 = 0);
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int __stdcall read_ea (HANDLE hdl, const char *file, const char *attrname,
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char *buf, int len);
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BOOL __stdcall write_ea (HANDLE hdl, const char *file, const char *attrname,
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const char *buf, int len);
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/* Note: sid1 is usually (read: currently always) the current user's
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effective sid (cygheap->user.sid ()). */
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extern inline SECURITY_ATTRIBUTES *
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sec_user_nih (SECURITY_ATTRIBUTES *sa_buf, PSID sid1, PSID sid2 = NULL,
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DWORD access2 = 0)
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{
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return __sec_user (sa_buf, sid1, sid2, access2, FALSE);
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}
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extern inline SECURITY_ATTRIBUTES *
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sec_user (SECURITY_ATTRIBUTES *sa_buf, PSID sid1, PSID sid2 = NULL,
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DWORD access2 = 0)
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{
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return __sec_user (sa_buf, sid1, sid2, access2, TRUE);
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}
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#endif /*_SECURITY_H*/
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