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newlib/winsup/cygwin/sec_helper.cc

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/* sec_helper.cc: NT security helper functions
Copyright 2000, 2001 Cygnus Solutions.
Written by Corinna Vinschen <corinna@vinschen.de>
This file is part of Cygwin.
This software is a copyrighted work licensed under the terms of the
Cygwin license. Please consult the file "CYGWIN_LICENSE" for
details. */
#include "winsup.h"
#include <grp.h>
#include <pwd.h>
#include <unistd.h>
#include <stdlib.h>
#include <errno.h>
#include <limits.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/acl.h>
#include <ctype.h>
#include <wingdi.h>
#include <winuser.h>
#include "cygerrno.h"
#include "perprocess.h"
#include "fhandler.h"
#include "path.h"
#include "dtable.h"
#include "sync.h"
#include "sigproc.h"
#include "pinfo.h"
#include "cygheap.h"
#include "security.h"
SID_IDENTIFIER_AUTHORITY sid_auth[] = {
{SECURITY_NULL_SID_AUTHORITY},
{SECURITY_WORLD_SID_AUTHORITY},
{SECURITY_LOCAL_SID_AUTHORITY},
{SECURITY_CREATOR_SID_AUTHORITY},
{SECURITY_NON_UNIQUE_AUTHORITY},
{SECURITY_NT_AUTHORITY}
};
char *
convert_sid_to_string_sid (PSID psid, char *sid_str)
{
char t[32];
DWORD i;
if (!psid || !sid_str)
return NULL;
strcpy (sid_str, "S-1-");
__small_sprintf(t, "%u", GetSidIdentifierAuthority (psid)->Value[5]);
strcat (sid_str, t);
for (i = 0; i < *GetSidSubAuthorityCount (psid); ++i)
{
__small_sprintf(t, "-%lu", *GetSidSubAuthority (psid, i));
strcat (sid_str, t);
}
return sid_str;
}
PSID
get_sid (PSID psid, DWORD s, DWORD cnt, DWORD *r)
{
DWORD i;
if (!psid || s > 5 || cnt < 1 || cnt > 8)
return NULL;
InitializeSid(psid, &sid_auth[s], cnt);
for (i = 0; i < cnt; ++i)
memcpy ((char *) psid + 8 + sizeof (DWORD) * i, &r[i], sizeof (DWORD));
return psid;
}
PSID
convert_string_sid_to_sid (PSID psid, const char *sid_str)
{
char sid_buf[256];
char *t, *lasts;
DWORD cnt = 0;
DWORD s = 0;
DWORD i, r[8];
if (!sid_str || strncmp (sid_str, "S-1-", 4))
return NULL;
strcpy (sid_buf, sid_str);
for (t = sid_buf + 4, i = 0;
cnt < 8 && (t = strtok_r (t, "-", &lasts));
t = NULL, ++i)
if (i == 0)
s = strtoul (t, NULL, 10);
else
r[cnt++] = strtoul (t, NULL, 10);
return get_sid (psid, s, cnt, r);
}
BOOL
get_pw_sid (PSID sid, struct passwd *pw)
{
char *sp = pw->pw_gecos ? strrchr (pw->pw_gecos, ',') : NULL;
if (!sp)
return FALSE;
return convert_string_sid_to_sid (sid, ++sp) != NULL;
}
BOOL
get_gr_sid (PSID sid, struct group *gr)
{
return convert_string_sid_to_sid (sid, gr->gr_passwd) != NULL;
}
PSID
get_admin_sid ()
{
static NO_COPY char admin_sid_buf[MAX_SID_LEN];
static NO_COPY PSID admin_sid = NULL;
if (!admin_sid)
{
admin_sid = (PSID) admin_sid_buf;
convert_string_sid_to_sid (admin_sid, "S-1-5-32-544");
}
return admin_sid;
}
PSID
get_system_sid ()
{
static NO_COPY char system_sid_buf[MAX_SID_LEN];
static NO_COPY PSID system_sid = NULL;
if (!system_sid)
{
system_sid = (PSID) system_sid_buf;
convert_string_sid_to_sid (system_sid, "S-1-5-18");
}
return system_sid;
}
PSID
get_creator_owner_sid ()
{
static NO_COPY char owner_sid_buf[MAX_SID_LEN];
static NO_COPY PSID owner_sid = NULL;
if (!owner_sid)
{
owner_sid = (PSID) owner_sid_buf;
convert_string_sid_to_sid (owner_sid, "S-1-3-0");
}
return owner_sid;
}
PSID
get_world_sid ()
{
static NO_COPY char world_sid_buf[MAX_SID_LEN];
static NO_COPY PSID world_sid = NULL;
if (!world_sid)
{
world_sid = (PSID) world_sid_buf;
convert_string_sid_to_sid (world_sid, "S-1-1-0");
}
return world_sid;
}
int
get_id_from_sid (PSID psid, BOOL search_grp, int *type)
{
if (!IsValidSid (psid))
{
__seterrno ();
small_printf ("IsValidSid failed with %E");
return -1;
}
/* First try to get SID from passwd or group entry */
if (allow_ntsec)
{
char sidbuf[MAX_SID_LEN];
PSID sid = (PSID) sidbuf;
int id = -1;
if (!search_grp)
{
struct passwd *pw;
while ((pw = getpwent ()) != NULL)
{
if (get_pw_sid (sid, pw) && EqualSid (psid, sid))
{
id = pw->pw_uid;
break;
}
}
endpwent ();
if (id >= 0)
{
if (type)
*type = USER;
return id;
}
}
if (search_grp || type)
{
struct group *gr;
while ((gr = getgrent ()) != NULL)
{
if (get_gr_sid (sid, gr) && EqualSid (psid, sid))
{
id = gr->gr_gid;
break;
}
}
endgrent ();
if (id >= 0)
{
if (type)
*type = GROUP;
return id;
}
}
}
/* We use the RID as default UID/GID */
int id = *GetSidSubAuthority(psid, *GetSidSubAuthorityCount(psid) - 1);
/*
* The RID maybe -1 if accountname == computername.
* In this case we search for the accountname in the passwd and group files.
* If type is needed, we search in each case.
*/
if (id == -1 || type)
{
char account[MAX_USER_NAME];
char domain[MAX_COMPUTERNAME_LENGTH+1];
DWORD acc_len = MAX_USER_NAME;
DWORD dom_len = MAX_COMPUTERNAME_LENGTH+1;
SID_NAME_USE acc_type;
if (!LookupAccountSid (NULL, psid, account, &acc_len,
domain, &dom_len, &acc_type))
{
__seterrno ();
return -1;
}
switch (acc_type)
{
case SidTypeGroup:
case SidTypeAlias:
case SidTypeWellKnownGroup:
if (type)
*type = GROUP;
if (id == -1)
{
struct group *gr = getgrnam (account);
if (gr)
id = gr->gr_gid;
}
break;
case SidTypeUser:
if (type)
*type = USER;
if (id == -1)
{
struct passwd *pw = getpwnam (account);
if (pw)
id = pw->pw_uid;
}
break;
default:
break;
}
}
if (id == -1)
id = getuid ();
return id;
}
int
get_id_from_sid (PSID psid, BOOL search_grp)
{
return get_id_from_sid (psid, search_grp, NULL);
}
BOOL
legal_sid_type (SID_NAME_USE type)
{
return type == SidTypeUser || type == SidTypeGroup
|| SidTypeAlias || SidTypeWellKnownGroup;
}
BOOL
is_grp_member (uid_t uid, gid_t gid)
{
extern int getgroups (int, gid_t *, gid_t, const char *);
BOOL grp_member = TRUE;
struct passwd *pw = getpwuid (uid);
gid_t grps[NGROUPS_MAX];
int cnt = getgroups (NGROUPS_MAX, grps,
pw ? pw->pw_gid : myself->gid,
pw ? pw->pw_name : cygheap->user.name ());
int i;
for (i = 0; i < cnt; ++i)
if (grps[i] == gid)
break;
grp_member = (i < cnt);
return grp_member;
}
BOOL
lookup_name (const char *name, const char *logsrv, PSID ret_sid)
{
char sidbuf[MAX_SID_LEN];
PSID sid = (PSID) sidbuf;
DWORD sidlen;
char domuser[MAX_COMPUTERNAME_LENGTH+MAX_USER_NAME+1];
char dom[MAX_COMPUTERNAME_LENGTH+1];
DWORD domlen;
SID_NAME_USE acc_type;
debug_printf ("name : %s", name ? name : "NULL");
if (!name)
return FALSE;
if (cygheap->user.domain ())
{
strcat (strcat (strcpy (domuser, cygheap->user.domain ()), "\\"), name);
if (LookupAccountName (NULL, domuser,
sid, (sidlen = MAX_SID_LEN, &sidlen),
dom, (domlen = MAX_COMPUTERNAME_LENGTH, &domlen),
&acc_type)
&& legal_sid_type (acc_type))
goto got_it;
if (logsrv && *logsrv
&& LookupAccountName (logsrv, domuser,
sid, (sidlen = MAX_SID_LEN, &sidlen),
dom, (domlen = MAX_COMPUTERNAME_LENGTH,&domlen),
&acc_type)
&& legal_sid_type (acc_type))
goto got_it;
}
if (logsrv && *logsrv)
{
if (LookupAccountName (logsrv, name,
sid, (sidlen = MAX_SID_LEN, &sidlen),
dom, (domlen = MAX_COMPUTERNAME_LENGTH, &domlen),
&acc_type)
&& legal_sid_type (acc_type))
goto got_it;
if (acc_type == SidTypeDomain)
{
strcat (strcat (strcpy (domuser, dom), "\\"), name);
if (LookupAccountName (logsrv, domuser,
sid,(sidlen = MAX_SID_LEN, &sidlen),
dom,(domlen = MAX_COMPUTERNAME_LENGTH,&domlen),
&acc_type))
goto got_it;
}
}
if (LookupAccountName (NULL, name,
sid, (sidlen = MAX_SID_LEN, &sidlen),
dom, (domlen = 100, &domlen),
&acc_type)
&& legal_sid_type (acc_type))
goto got_it;
if (acc_type == SidTypeDomain)
{
strcat (strcat (strcpy (domuser, dom), "\\"), name);
if (LookupAccountName (NULL, domuser,
sid, (sidlen = MAX_SID_LEN, &sidlen),
dom, (domlen = MAX_COMPUTERNAME_LENGTH, &domlen),
&acc_type))
goto got_it;
}
debug_printf ("LookupAccountName(%s) %E", name);
__seterrno ();
return FALSE;
got_it:
debug_printf ("sid : [%d]", *GetSidSubAuthority((PSID) sid,
*GetSidSubAuthorityCount((PSID) sid) - 1));
if (ret_sid)
memcpy (ret_sid, sid, sidlen);
return TRUE;
}
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