411 lines
8.6 KiB
C++
411 lines
8.6 KiB
C++
/* sec_helper.cc: NT security helper functions
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Copyright 2000, 2001 Cygnus Solutions.
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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 <grp.h>
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#include <pwd.h>
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#include <unistd.h>
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#include <stdlib.h>
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#include <errno.h>
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#include <limits.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <sys/acl.h>
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#include <ctype.h>
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#include <wingdi.h>
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#include <winuser.h>
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#include <wininet.h>
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#include "cygerrno.h"
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#include "perprocess.h"
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#include "fhandler.h"
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#include "path.h"
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#include "dtable.h"
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#include "sync.h"
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#include "sigproc.h"
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#include "pinfo.h"
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#include "cygheap.h"
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#include "security.h"
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SID_IDENTIFIER_AUTHORITY sid_auth[] = {
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{SECURITY_NULL_SID_AUTHORITY},
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{SECURITY_WORLD_SID_AUTHORITY},
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{SECURITY_LOCAL_SID_AUTHORITY},
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{SECURITY_CREATOR_SID_AUTHORITY},
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{SECURITY_NON_UNIQUE_AUTHORITY},
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{SECURITY_NT_AUTHORITY}
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};
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char *
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convert_sid_to_string_sid (PSID psid, char *sid_str)
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{
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char t[32];
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DWORD i;
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if (!psid || !sid_str)
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return NULL;
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strcpy (sid_str, "S-1-");
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__small_sprintf(t, "%u", GetSidIdentifierAuthority (psid)->Value[5]);
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strcat (sid_str, t);
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for (i = 0; i < *GetSidSubAuthorityCount (psid); ++i)
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{
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__small_sprintf(t, "-%lu", *GetSidSubAuthority (psid, i));
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strcat (sid_str, t);
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}
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return sid_str;
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}
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PSID
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get_sid (PSID psid, DWORD s, DWORD cnt, DWORD *r)
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{
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DWORD i;
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if (!psid || s > 5 || cnt < 1 || cnt > 8)
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return NULL;
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InitializeSid(psid, &sid_auth[s], 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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return psid;
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}
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PSID
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convert_string_sid_to_sid (PSID psid, const char *sid_str)
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{
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char sid_buf[256];
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char *t, *lasts;
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DWORD cnt = 0;
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DWORD s = 0;
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DWORD i, r[8];
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if (!sid_str || strncmp (sid_str, "S-1-", 4))
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return NULL;
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strcpy (sid_buf, sid_str);
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for (t = sid_buf + 4, i = 0;
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cnt < 8 && (t = strtok_r (t, "-", &lasts));
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t = NULL, ++i)
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if (i == 0)
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s = strtoul (t, NULL, 10);
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else
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r[cnt++] = strtoul (t, NULL, 10);
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return get_sid (psid, s, cnt, r);
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}
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BOOL
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get_pw_sid (PSID sid, struct passwd *pw)
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{
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char *sp = pw->pw_gecos ? strrchr (pw->pw_gecos, ',') : NULL;
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if (!sp)
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return FALSE;
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return convert_string_sid_to_sid (sid, ++sp) != NULL;
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}
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BOOL
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get_gr_sid (PSID sid, struct group *gr)
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{
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return convert_string_sid_to_sid (sid, gr->gr_passwd) != NULL;
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}
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PSID
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get_admin_sid ()
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{
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static NO_COPY cygsid admin_sid (NULL);
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if (!admin_sid)
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convert_string_sid_to_sid (admin_sid.set (), "S-1-5-32-544");
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return admin_sid;
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}
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PSID
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get_system_sid ()
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{
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static NO_COPY cygsid system_sid (NULL);
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if (!system_sid)
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convert_string_sid_to_sid (system_sid.set (), "S-1-5-18");
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return system_sid;
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}
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PSID
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get_creator_owner_sid ()
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{
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static NO_COPY cygsid owner_sid (NULL);
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if (!owner_sid)
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convert_string_sid_to_sid (owner_sid.set (), "S-1-3-0");
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return owner_sid;
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}
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PSID
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get_world_sid ()
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{
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static NO_COPY cygsid world_sid (NULL);
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if (!world_sid)
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convert_string_sid_to_sid (world_sid.set (), "S-1-1-0");
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return world_sid;
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}
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int
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get_id_from_sid (PSID psid, BOOL search_grp, int *type)
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{
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if (!IsValidSid (psid))
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{
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__seterrno ();
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small_printf ("IsValidSid failed with %E");
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return -1;
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}
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/* First try to get SID from passwd or group entry */
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if (allow_ntsec)
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{
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cygsid sid;
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int id = -1;
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if (!search_grp)
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{
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struct passwd *pw;
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for (int pidx = 0; (pw = internal_getpwent (pidx)); ++pidx)
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{
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if (get_pw_sid (sid, pw) && sid == psid)
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{
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id = pw->pw_uid;
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break;
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}
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}
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if (id >= 0)
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{
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if (type)
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*type = USER;
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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 group *gr;
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for (int gidx = 0; (gr = internal_getgrent (gidx)); ++gidx)
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{
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if (get_gr_sid (sid, gr) && sid == psid)
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{
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id = gr->gr_gid;
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break;
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}
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}
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if (id >= 0)
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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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}
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/* We use the RID as default UID/GID */
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int id = *GetSidSubAuthority(psid, *GetSidSubAuthorityCount(psid) - 1);
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/*
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* The RID maybe -1 if accountname == computername.
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* In this case we search for the accountname in the passwd and group files.
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* If type is needed, we search in each case.
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*/
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if (id == -1 || type)
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{
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char account[UNLEN + 1];
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char domain[INTERNET_MAX_HOST_NAME_LENGTH + 1];
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DWORD acc_len = UNLEN + 1;
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DWORD dom_len = INTERNET_MAX_HOST_NAME_LENGTH + 1;
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SID_NAME_USE acc_type;
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if (!LookupAccountSid (NULL, psid, account, &acc_len,
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domain, &dom_len, &acc_type))
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{
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__seterrno ();
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return -1;
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}
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switch (acc_type)
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{
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case SidTypeGroup:
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case SidTypeAlias:
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case SidTypeWellKnownGroup:
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if (type)
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*type = GROUP;
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if (id == -1)
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{
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struct group *gr = getgrnam (account);
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if (gr)
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id = gr->gr_gid;
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}
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break;
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case SidTypeUser:
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if (type)
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*type = USER;
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if (id == -1)
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{
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struct passwd *pw = getpwnam (account);
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if (pw)
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id = pw->pw_uid;
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}
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break;
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default:
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break;
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}
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}
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if (id == -1)
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id = getuid ();
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return id;
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}
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int
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get_id_from_sid (PSID psid, BOOL search_grp)
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{
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return get_id_from_sid (psid, search_grp, NULL);
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}
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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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|| SidTypeAlias || SidTypeWellKnownGroup;
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}
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BOOL
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is_grp_member (uid_t uid, gid_t gid)
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{
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extern int getgroups (int, gid_t *, gid_t, const char *);
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BOOL grp_member = TRUE;
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struct passwd *pw = getpwuid (uid);
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gid_t grps[NGROUPS_MAX];
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int cnt = getgroups (NGROUPS_MAX, grps,
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pw ? pw->pw_gid : myself->gid,
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pw ? pw->pw_name : cygheap->user.name ());
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int i;
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for (i = 0; i < cnt; ++i)
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if (grps[i] == gid)
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break;
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grp_member = (i < cnt);
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return grp_member;
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}
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#define SIDLEN (sidlen = MAX_SID_LEN, &sidlen)
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#define DOMLEN (domlen = INTERNET_MAX_HOST_NAME_LENGTH, &domlen)
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BOOL
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lookup_name (const char *name, const char *logsrv, PSID ret_sid)
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{
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cygsid sid;
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DWORD sidlen;
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char domuser[INTERNET_MAX_HOST_NAME_LENGTH + UNLEN + 2];
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char dom[INTERNET_MAX_HOST_NAME_LENGTH + 1];
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DWORD domlen;
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SID_NAME_USE acc_type;
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debug_printf ("name : %s", name ? name : "NULL");
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if (!name)
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return FALSE;
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if (cygheap->user.domain ())
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{
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strcat (strcat (strcpy (domuser, cygheap->user.domain ()), "\\"), name);
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if (LookupAccountName (NULL, domuser, sid, SIDLEN, dom, DOMLEN, &acc_type)
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&& legal_sid_type (acc_type))
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goto got_it;
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if (logsrv && *logsrv
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&& LookupAccountName (logsrv, domuser, sid, SIDLEN,
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dom, DOMLEN, &acc_type)
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&& legal_sid_type (acc_type))
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goto got_it;
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}
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if (logsrv && *logsrv)
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{
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if (LookupAccountName (logsrv, name, sid, SIDLEN, dom, DOMLEN, &acc_type)
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&& legal_sid_type (acc_type))
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goto got_it;
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if (acc_type == SidTypeDomain)
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{
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strcat (strcat (strcpy (domuser, dom), "\\"), name);
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if (LookupAccountName (logsrv, domuser, sid, SIDLEN,
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dom, DOMLEN, &acc_type))
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goto got_it;
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}
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}
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if (LookupAccountName (NULL, name, sid, SIDLEN, dom, DOMLEN, &acc_type)
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&& legal_sid_type (acc_type))
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goto got_it;
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if (acc_type == SidTypeDomain)
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{
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strcat (strcat (strcpy (domuser, dom), "\\"), name);
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if (LookupAccountName (NULL, domuser, sid, SIDLEN, dom, DOMLEN,&acc_type))
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goto got_it;
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}
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debug_printf ("LookupAccountName(%s) %E", name);
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__seterrno ();
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return FALSE;
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got_it:
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debug_printf ("sid : [%d]", *GetSidSubAuthority((PSID) sid,
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*GetSidSubAuthorityCount((PSID) sid) - 1));
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if (ret_sid)
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memcpy (ret_sid, sid, sidlen);
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return TRUE;
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}
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#undef SIDLEN
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#undef DOMLEN
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int
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set_process_privilege (const char *privilege, BOOL enable)
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{
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HANDLE hToken = NULL;
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LUID restore_priv;
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TOKEN_PRIVILEGES new_priv;
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int ret = -1;
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if (!OpenProcessToken (hMainProc, TOKEN_ADJUST_PRIVILEGES, &hToken))
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{
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__seterrno ();
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goto out;
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}
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if (!LookupPrivilegeValue (NULL, privilege, &restore_priv))
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{
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__seterrno ();
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goto out;
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}
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new_priv.PrivilegeCount = 1;
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new_priv.Privileges[0].Luid = restore_priv;
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new_priv.Privileges[0].Attributes = enable ? SE_PRIVILEGE_ENABLED : 0;
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if (!AdjustTokenPrivileges (hToken, FALSE, &new_priv, 0, NULL, NULL))
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{
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__seterrno ();
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goto out;
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}
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ret = 0;
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out:
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if (hToken)
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CloseHandle (hToken);
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syscall_printf ("%d = set_process_privilege (%s, %d)",ret, privilege, enable);
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return ret;
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}
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