564 lines
15 KiB
C++
564 lines
15 KiB
C++
/* sec_helper.cc: NT security helper functions
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Copyright 2000, 2001, 2002, 2003, 2004, 2006, 2007, 2008 Red Hat, Inc.
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Written by Corinna Vinschen <corinna@vinschen.de>
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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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#include "winsup.h"
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#include <stdlib.h>
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#include <sys/acl.h>
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#include <wchar.h>
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#include "cygerrno.h"
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#include "security.h"
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#include "path.h"
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#include "fhandler.h"
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#include "dtable.h"
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#include "pinfo.h"
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#include "cygheap.h"
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#include "pwdgrp.h"
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#include "ntdll.h"
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/* General purpose security attribute objects for global use. */
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SECURITY_ATTRIBUTES NO_COPY sec_none;
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SECURITY_ATTRIBUTES NO_COPY sec_none_nih;
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SECURITY_ATTRIBUTES NO_COPY sec_all;
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SECURITY_ATTRIBUTES NO_COPY sec_all_nih;
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MKSID (well_known_null_sid, "S-1-0-0",
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SECURITY_NULL_SID_AUTHORITY, 1, SECURITY_NULL_RID);
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MKSID (well_known_world_sid, "S-1-1-0",
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SECURITY_WORLD_SID_AUTHORITY, 1, SECURITY_WORLD_RID);
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MKSID (well_known_local_sid, "S-1-2-0",
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SECURITY_LOCAL_SID_AUTHORITY, 1, SECURITY_LOCAL_RID);
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MKSID (well_known_creator_owner_sid, "S-1-3-0",
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SECURITY_CREATOR_SID_AUTHORITY, 1, SECURITY_CREATOR_OWNER_RID);
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MKSID (well_known_creator_group_sid, "S-1-3-1",
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SECURITY_CREATOR_SID_AUTHORITY, 1, SECURITY_CREATOR_GROUP_RID);
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MKSID (well_known_dialup_sid, "S-1-5-1",
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SECURITY_NT_AUTHORITY, 1, SECURITY_DIALUP_RID);
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MKSID (well_known_network_sid, "S-1-5-2",
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SECURITY_NT_AUTHORITY, 1, SECURITY_NETWORK_RID);
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MKSID (well_known_batch_sid, "S-1-5-3",
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SECURITY_NT_AUTHORITY, 1, SECURITY_BATCH_RID);
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MKSID (well_known_interactive_sid, "S-1-5-4",
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SECURITY_NT_AUTHORITY, 1, SECURITY_INTERACTIVE_RID);
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MKSID (well_known_service_sid, "S-1-5-6",
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SECURITY_NT_AUTHORITY, 1, SECURITY_SERVICE_RID);
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MKSID (well_known_authenticated_users_sid, "S-1-5-11",
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SECURITY_NT_AUTHORITY, 1, SECURITY_AUTHENTICATED_USER_RID);
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MKSID (well_known_this_org_sid, "S-1-5-15",
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SECURITY_NT_AUTHORITY, 1, 15);
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MKSID (well_known_system_sid, "S-1-5-18",
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SECURITY_NT_AUTHORITY, 1, SECURITY_LOCAL_SYSTEM_RID);
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MKSID (well_known_admins_sid, "S-1-5-32-544",
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SECURITY_NT_AUTHORITY, 2, SECURITY_BUILTIN_DOMAIN_RID,
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DOMAIN_ALIAS_RID_ADMINS);
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MKSID (fake_logon_sid, "S-1-5-5-0-0",
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SECURITY_NT_AUTHORITY, 3, SECURITY_LOGON_IDS_RID, 0, 0);
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MKSID (mandatory_medium_integrity_sid, "S-1-16-8192",
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SECURITY_MANDATORY_LABEL_AUTHORITY, 1, SECURITY_MANDATORY_MEDIUM_RID);
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MKSID (mandatory_high_integrity_sid, "S-1-16-12288",
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SECURITY_MANDATORY_LABEL_AUTHORITY, 1, SECURITY_MANDATORY_HIGH_RID);
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MKSID (mandatory_system_integrity_sid, "S-1-16-16384",
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SECURITY_MANDATORY_LABEL_AUTHORITY, 1, SECURITY_MANDATORY_SYSTEM_RID);
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bool
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cygpsid::operator== (const char *nsidstr) const
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{
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cygsid nsid (nsidstr);
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return psid == nsid;
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}
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__uid32_t
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cygpsid::get_id (BOOL search_grp, int *type)
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{
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/* First try to get SID from group, then passwd */
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__uid32_t id = ILLEGAL_UID;
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if (search_grp)
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{
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struct __group32 *gr;
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if (cygheap->user.groups.pgsid == psid)
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id = myself->gid;
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else if ((gr = internal_getgrsid (*this)))
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id = gr->gr_gid;
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if (id != ILLEGAL_UID)
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{
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if (type)
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*type = GROUP;
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return id;
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}
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}
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if (!search_grp || type)
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{
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struct passwd *pw;
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if (*this == cygheap->user.sid ())
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id = myself->uid;
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else if ((pw = internal_getpwsid (*this)))
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id = pw->pw_uid;
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if (id != ILLEGAL_UID && type)
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*type = USER;
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}
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return id;
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}
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PWCHAR
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cygpsid::string (PWCHAR nsidstr) const
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{
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UNICODE_STRING sid;
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if (!psid || !nsidstr)
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return NULL;
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RtlInitEmptyUnicodeString (&sid, nsidstr, 256);
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RtlConvertSidToUnicodeString (&sid, psid, FALSE);
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return nsidstr;
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}
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char *
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cygpsid::string (char *nsidstr) const
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{
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char *t;
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DWORD i;
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if (!psid || !nsidstr)
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return NULL;
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strcpy (nsidstr, "S-1-");
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t = nsidstr + sizeof ("S-1-") - 1;
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t += __small_sprintf (t, "%u", GetSidIdentifierAuthority (psid)->Value[5]);
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for (i = 0; i < *GetSidSubAuthorityCount (psid); ++i)
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t += __small_sprintf (t, "-%lu", *GetSidSubAuthority (psid, i));
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return nsidstr;
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}
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PSID
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cygsid::get_sid (DWORD s, DWORD cnt, DWORD *r, bool well_known)
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{
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DWORD i;
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SID_IDENTIFIER_AUTHORITY sid_auth = {0,0,0,0,0,0};
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if (s > 255 || cnt < 1 || cnt > 8)
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{
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psid = NO_SID;
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return NULL;
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}
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sid_auth.Value[5] = s;
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set ();
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InitializeSid (psid, &sid_auth, cnt);
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for (i = 0; i < cnt; ++i)
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memcpy ((char *) psid + 8 + sizeof (DWORD) * i, &r[i], sizeof (DWORD));
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well_known_sid = well_known;
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return psid;
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}
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const PSID
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cygsid::getfromstr (const char *nsidstr, bool well_known)
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{
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char *lasts;
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DWORD s, cnt = 0;
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DWORD r[8];
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if (nsidstr && !strncmp (nsidstr, "S-1-", 4))
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{
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s = strtoul (nsidstr + 4, &lasts, 10);
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while (cnt < 8 && *lasts == '-')
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r[cnt++] = strtoul (lasts + 1, &lasts, 10);
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if (!*lasts)
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return get_sid (s, cnt, r, well_known);
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}
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return psid = NO_SID;
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}
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BOOL
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cygsid::getfrompw (const struct passwd *pw)
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{
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char *sp = (pw && pw->pw_gecos) ? strrchr (pw->pw_gecos, ',') : NULL;
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return (*this = sp ? sp + 1 : sp) != NULL;
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}
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BOOL
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cygsid::getfromgr (const struct __group32 *gr)
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{
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char *sp = (gr && gr->gr_passwd) ? gr->gr_passwd : NULL;
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return (*this = sp) != NULL;
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}
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cygsid *
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cygsidlist::alloc_sids (int n)
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{
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if (n > 0)
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return (cygsid *) cmalloc (HEAP_STR, n * sizeof (cygsid));
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else
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return NULL;
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}
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void
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cygsidlist::free_sids ()
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{
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if (sids)
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cfree (sids);
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sids = NULL;
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cnt = maxcnt = 0;
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type = cygsidlist_empty;
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}
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BOOL
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cygsidlist::add (const PSID nsi, bool well_known)
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{
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if (contains (nsi))
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return TRUE;
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if (cnt >= maxcnt)
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{
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cygsid *tmp = new cygsid [2 * maxcnt];
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if (!tmp)
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return FALSE;
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maxcnt *= 2;
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for (int i = 0; i < cnt; ++i)
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tmp[i] = sids[i];
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delete [] sids;
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sids = tmp;
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}
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if (well_known)
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sids[cnt++] *= nsi;
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else
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sids[cnt++] = nsi;
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return TRUE;
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}
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bool
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get_sids_info (cygpsid owner_sid, cygpsid group_sid, __uid32_t * uidret, __gid32_t * gidret)
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{
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struct passwd *pw;
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struct __group32 *gr = NULL;
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bool ret = false;
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owner_sid.debug_print ("get_sids_info: owner SID =");
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group_sid.debug_print ("get_sids_info: group SID =");
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if (group_sid == cygheap->user.groups.pgsid)
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*gidret = myself->gid;
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else if ((gr = internal_getgrsid (group_sid)))
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*gidret = gr->gr_gid;
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else
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*gidret = ILLEGAL_GID;
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if (owner_sid == cygheap->user.sid ())
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{
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*uidret = myself->uid;
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if (*gidret == myself->gid)
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ret = true;
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else
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ret = (internal_getgroups (0, NULL, &group_sid) > 0);
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}
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else if ((pw = internal_getpwsid (owner_sid)))
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{
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*uidret = pw->pw_uid;
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if (gr || (*gidret != ILLEGAL_GID
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&& (gr = internal_getgrgid (*gidret))))
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for (int idx = 0; gr->gr_mem[idx]; ++idx)
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if ((ret = strcasematch (pw->pw_name, gr->gr_mem[idx])))
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break;
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}
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else
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*uidret = ILLEGAL_UID;
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return ret;
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}
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PSECURITY_DESCRIPTOR
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security_descriptor::malloc (size_t nsize)
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{
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free ();
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if ((psd = (PSECURITY_DESCRIPTOR) ::malloc (nsize)))
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sd_size = nsize;
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return psd;
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}
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PSECURITY_DESCRIPTOR
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security_descriptor::realloc (size_t nsize)
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{
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PSECURITY_DESCRIPTOR tmp;
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if (!(tmp = (PSECURITY_DESCRIPTOR) ::realloc (psd, nsize)))
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return NULL;
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sd_size = nsize;
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return psd = tmp;
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}
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void
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security_descriptor::free ()
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{
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if (psd)
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::free (psd);
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psd = NULL;
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sd_size = 0;
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}
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#undef TEXT
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#define TEXT(q) L##q
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/* Index must match the correspoding foo_PRIVILEGE value, see security.h. */
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static const wchar_t *cygpriv[] =
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{
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L"",
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L"",
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SE_CREATE_TOKEN_NAME,
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SE_ASSIGNPRIMARYTOKEN_NAME,
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SE_LOCK_MEMORY_NAME,
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SE_INCREASE_QUOTA_NAME,
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SE_MACHINE_ACCOUNT_NAME,
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SE_TCB_NAME,
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SE_SECURITY_NAME,
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SE_TAKE_OWNERSHIP_NAME,
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SE_LOAD_DRIVER_NAME,
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SE_SYSTEM_PROFILE_NAME,
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SE_SYSTEMTIME_NAME,
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SE_PROF_SINGLE_PROCESS_NAME,
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SE_INC_BASE_PRIORITY_NAME,
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SE_CREATE_PAGEFILE_NAME,
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SE_CREATE_PERMANENT_NAME,
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SE_BACKUP_NAME,
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SE_RESTORE_NAME,
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SE_SHUTDOWN_NAME,
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SE_DEBUG_NAME,
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SE_AUDIT_NAME,
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SE_SYSTEM_ENVIRONMENT_NAME,
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SE_CHANGE_NOTIFY_NAME,
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SE_REMOTE_SHUTDOWN_NAME,
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SE_UNDOCK_NAME,
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SE_SYNC_AGENT_NAME,
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SE_ENABLE_DELEGATION_NAME,
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SE_MANAGE_VOLUME_NAME,
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SE_IMPERSONATE_NAME,
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SE_CREATE_GLOBAL_NAME,
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SE_TRUSTED_CREDMAN_ACCESS_NAME,
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SE_RELABEL_NAME,
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SE_INCREASE_WORKING_SET_NAME,
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SE_TIME_ZONE_NAME,
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SE_CREATE_SYMBOLIC_LINK_NAME
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};
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bool
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privilege_luid (const PWCHAR pname, LUID *luid)
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{
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ULONG idx;
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for (idx = SE_CREATE_TOKEN_PRIVILEGE;
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idx <= SE_MAX_WELL_KNOWN_PRIVILEGE;
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++idx)
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if (!wcscmp (cygpriv[idx], pname))
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{
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luid->HighPart = 0;
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luid->LowPart = idx;
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return true;
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}
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return false;
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}
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static const wchar_t *
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privilege_name (const LUID &priv_luid)
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{
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if (priv_luid.HighPart || priv_luid.LowPart < SE_CREATE_TOKEN_PRIVILEGE
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|| priv_luid.LowPart > SE_MAX_WELL_KNOWN_PRIVILEGE)
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return L"<unknown privilege>";
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return cygpriv[priv_luid.LowPart];
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}
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int
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set_privilege (HANDLE token, DWORD privilege, bool enable)
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{
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int ret = -1;
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TOKEN_PRIVILEGES new_priv, orig_priv;
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ULONG size;
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NTSTATUS status;
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new_priv.PrivilegeCount = 1;
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new_priv.Privileges[0].Luid.HighPart = 0L;
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new_priv.Privileges[0].Luid.LowPart = privilege;
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new_priv.Privileges[0].Attributes = enable ? SE_PRIVILEGE_ENABLED : 0;
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status = NtAdjustPrivilegesToken (token, FALSE, &new_priv, sizeof orig_priv,
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&orig_priv, &size);
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if (!NT_SUCCESS (status))
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{
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__seterrno_from_nt_status (status);
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goto out;
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}
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/* If orig_priv.PrivilegeCount is 0, the privilege hasn't been changed. */
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if (!orig_priv.PrivilegeCount)
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ret = enable ? 1 : 0;
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else
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ret = (orig_priv.Privileges[0].Attributes & SE_PRIVILEGE_ENABLED) ? 1 : 0;
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out:
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if (ret < 0)
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debug_printf ("%d = set_privilege ((token %x) %W, %d)\n", ret, token,
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privilege_name (new_priv.Privileges[0].Luid), enable);
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return ret;
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}
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/* This is called very early in process initialization. The code must
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not depend on anything. */
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void
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set_cygwin_privileges (HANDLE token)
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{
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set_privilege (token, SE_RESTORE_PRIVILEGE, true);
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set_privilege (token, SE_BACKUP_PRIVILEGE, true);
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if (wincap.has_create_global_privilege ())
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set_privilege (token, SE_CREATE_GLOBAL_PRIVILEGE, true);
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}
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/* Function to return a common SECURITY_DESCRIPTOR that
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allows all access. */
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SECURITY_DESCRIPTOR *__stdcall
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get_null_sd ()
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{
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static NO_COPY SECURITY_DESCRIPTOR sd;
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static NO_COPY SECURITY_DESCRIPTOR *null_sdp;
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if (!null_sdp)
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{
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InitializeSecurityDescriptor (&sd, SECURITY_DESCRIPTOR_REVISION);
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SetSecurityDescriptorDacl (&sd, TRUE, 0, FALSE);
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null_sdp = &sd;
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}
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return null_sdp;
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}
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/* Initialize global security attributes.
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Called from dcrt0.cc (_dll_crt0). */
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void
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init_global_security ()
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{
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sec_none.nLength = sec_none_nih.nLength =
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sec_all.nLength = sec_all_nih.nLength = sizeof (SECURITY_ATTRIBUTES);
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sec_none.bInheritHandle = sec_all.bInheritHandle = TRUE;
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sec_none_nih.bInheritHandle = sec_all_nih.bInheritHandle = FALSE;
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sec_none.lpSecurityDescriptor = sec_none_nih.lpSecurityDescriptor = NULL;
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sec_all.lpSecurityDescriptor = sec_all_nih.lpSecurityDescriptor =
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get_null_sd ();
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}
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bool
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sec_acl (PACL acl, bool original, bool admins, PSID sid1, PSID sid2, DWORD access2)
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{
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size_t acl_len = MAX_DACL_LEN(5);
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LPVOID pAce;
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cygpsid psid;
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#ifdef DEBUGGING
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if ((unsigned long) acl % 4)
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api_fatal ("Incorrectly aligned incoming ACL buffer!");
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#endif
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if (!InitializeAcl (acl, acl_len, ACL_REVISION))
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{
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debug_printf ("InitializeAcl %E");
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return false;
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}
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if (sid1)
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if (!AddAccessAllowedAce (acl, ACL_REVISION,
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GENERIC_ALL, sid1))
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debug_printf ("AddAccessAllowedAce(sid1) %E");
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if (original && (psid = cygheap->user.saved_sid ())
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&& psid != sid1 && psid != well_known_system_sid)
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if (!AddAccessAllowedAce (acl, ACL_REVISION,
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GENERIC_ALL, psid))
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debug_printf ("AddAccessAllowedAce(original) %E");
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if (sid2)
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if (!AddAccessAllowedAce (acl, ACL_REVISION,
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access2, sid2))
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debug_printf ("AddAccessAllowedAce(sid2) %E");
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if (admins)
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if (!AddAccessAllowedAce (acl, ACL_REVISION,
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GENERIC_ALL, well_known_admins_sid))
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|
debug_printf ("AddAccessAllowedAce(admin) %E");
|
|
if (!AddAccessAllowedAce (acl, ACL_REVISION,
|
|
GENERIC_ALL, well_known_system_sid))
|
|
debug_printf ("AddAccessAllowedAce(system) %E");
|
|
FindFirstFreeAce (acl, &pAce);
|
|
if (pAce)
|
|
acl->AclSize = (char *) pAce - (char *) acl;
|
|
else
|
|
debug_printf ("FindFirstFreeAce %E");
|
|
|
|
return true;
|
|
}
|
|
|
|
PSECURITY_ATTRIBUTES __stdcall
|
|
__sec_user (PVOID sa_buf, PSID sid1, PSID sid2, DWORD access2, BOOL inherit)
|
|
{
|
|
PSECURITY_ATTRIBUTES psa = (PSECURITY_ATTRIBUTES) sa_buf;
|
|
PSECURITY_DESCRIPTOR psd = (PSECURITY_DESCRIPTOR)
|
|
((char *) sa_buf + sizeof (*psa));
|
|
PACL acl = (PACL) ((char *) sa_buf + sizeof (*psa) + sizeof (*psd));
|
|
|
|
#ifdef DEBUGGING
|
|
if ((unsigned long) sa_buf % 4)
|
|
api_fatal ("Incorrectly aligned incoming SA buffer!");
|
|
#endif
|
|
if (!sec_acl (acl, true, true, sid1, sid2, access2))
|
|
return inherit ? &sec_none : &sec_none_nih;
|
|
|
|
if (!InitializeSecurityDescriptor (psd, SECURITY_DESCRIPTOR_REVISION))
|
|
debug_printf ("InitializeSecurityDescriptor %E");
|
|
|
|
/*
|
|
* Setting the owner lets the created security attribute not work
|
|
* on NT4 SP3 Server. Don't know why, but the function still does
|
|
* what it should do also if the owner isn't set.
|
|
*/
|
|
#if 0
|
|
if (!SetSecurityDescriptorOwner (psd, sid, FALSE))
|
|
debug_printf ("SetSecurityDescriptorOwner %E");
|
|
#endif
|
|
|
|
if (!SetSecurityDescriptorDacl (psd, TRUE, acl, FALSE))
|
|
debug_printf ("SetSecurityDescriptorDacl %E");
|
|
|
|
psa->nLength = sizeof (SECURITY_ATTRIBUTES);
|
|
psa->lpSecurityDescriptor = psd;
|
|
psa->bInheritHandle = inherit;
|
|
return psa;
|
|
}
|
|
|
|
/* Helper function to create an event security descriptor which only allows
|
|
specific access to everyone. Only the creating process has all access
|
|
rights. */
|
|
|
|
PSECURITY_DESCRIPTOR
|
|
_everyone_sd (void *buf, ACCESS_MASK access)
|
|
{
|
|
PSECURITY_DESCRIPTOR psd = (PSECURITY_DESCRIPTOR) buf;
|
|
|
|
if (psd)
|
|
{
|
|
InitializeSecurityDescriptor (psd, SECURITY_DESCRIPTOR_REVISION);
|
|
PACL dacl = (PACL) (psd + 1);
|
|
InitializeAcl (dacl, MAX_DACL_LEN (1), ACL_REVISION);
|
|
if (!AddAccessAllowedAce (dacl, ACL_REVISION, access,
|
|
well_known_world_sid))
|
|
{
|
|
debug_printf ("AddAccessAllowedAce: %lu", GetLastError ());
|
|
return NULL;
|
|
}
|
|
LPVOID ace;
|
|
if (!FindFirstFreeAce (dacl, &ace))
|
|
{
|
|
debug_printf ("FindFirstFreeAce: %lu", GetLastError ());
|
|
return NULL;
|
|
}
|
|
dacl->AclSize = (char *) ace - (char *) dacl;
|
|
SetSecurityDescriptorDacl (psd, TRUE, dacl, FALSE);
|
|
}
|
|
return psd;
|
|
}
|
|
|