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newlib-cygwin/winsup/cygwin/ldap.cc

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/* ldap.cc: Helper functions for ldap access to Active Directory.
Copyright 2014 Red Hat, Inc.
This file is part of Cygwin.
This software is a copyrighted work licensed under the terms of the
Cygwin license. Please consult the file "CYGWIN_LICENSE" for
details. */
#include "winsup.h"
#include "ldap.h"
#include "cygerrno.h"
#include "security.h"
#include "path.h"
#include "fhandler.h"
#include "dtable.h"
#include "cygheap.h"
#include "registry.h"
#include "pinfo.h"
#include "lm.h"
#include "dsgetdc.h"
static LDAP_TIMEVAL tv = { 3, 0 };
static PWCHAR rootdse_attr[] =
{
(PWCHAR) L"defaultNamingContext",
(PWCHAR) L"supportedCapabilities",
NULL
};
static PWCHAR user_attr[] =
{
(PWCHAR) L"uid",
(PWCHAR) L"primaryGroupID",
(PWCHAR) L"gecos",
(PWCHAR) L"unixHomeDirectory",
(PWCHAR) L"loginShell",
(PWCHAR) L"uidNumber",
NULL
};
static PWCHAR group_attr[] =
{
(PWCHAR) L"cn",
(PWCHAR) L"gidNumber",
NULL
};
PWCHAR tdom_attr[] =
{
(PWCHAR) L"trustPosixOffset",
NULL
};
PWCHAR nfs_attr[] =
{
(PWCHAR) L"objectSid",
NULL
};
PWCHAR rfc2307_uid_attr[] =
{
(PWCHAR) L"uid",
NULL
};
PWCHAR rfc2307_gid_attr[] =
{
(PWCHAR) L"cn",
NULL
};
DWORD WINAPI
rediscover_thread (LPVOID domain)
{
PDOMAIN_CONTROLLER_INFOW pdci;
DWORD ret = DsGetDcNameW (NULL, (PWCHAR) domain, NULL, NULL,
DS_FORCE_REDISCOVERY | DS_ONLY_LDAP_NEEDED, &pdci);
if (ret == ERROR_SUCCESS)
NetApiBufferFree (pdci);
else
debug_printf ("DsGetDcNameW(%W) failed with error %u", domain, ret);
return 0;
}
bool
cyg_ldap::connect_ssl (PCWSTR domain)
{
ULONG ret, timelimit = 3; /* secs */
if (!(lh = ldap_sslinitW ((PWCHAR) domain, LDAP_SSL_PORT, 1)))
{
debug_printf ("ldap_init(%W) error 0x%02x", domain, LdapGetLastError ());
return false;
}
if ((ret = ldap_set_option (lh, LDAP_OPT_TIMELIMIT, &timelimit))
!= LDAP_SUCCESS)
debug_printf ("ldap_set_option(LDAP_OPT_TIMELIMIT) error 0x%02x", ret);
if ((ret = ldap_bind_s (lh, NULL, NULL, LDAP_AUTH_NEGOTIATE)) != LDAP_SUCCESS)
{
debug_printf ("ldap_bind(%W) 0x%02x", domain, ret);
ldap_unbind (lh);
lh = NULL;
return false;
}
return true;
}
bool
cyg_ldap::connect_non_ssl (PCWSTR domain)
{
ULONG ret, timelimit = 3; /* secs */
if (!(lh = ldap_initW ((PWCHAR) domain, LDAP_PORT)))
{
debug_printf ("ldap_init(%W) error 0x%02x", domain, LdapGetLastError ());
return false;
}
if ((ret = ldap_set_option (lh, LDAP_OPT_SIGN, LDAP_OPT_ON))
!= LDAP_SUCCESS)
debug_printf ("ldap_set_option(LDAP_OPT_SIGN) error 0x%02x", ret);
if ((ret = ldap_set_option (lh, LDAP_OPT_ENCRYPT, LDAP_OPT_ON))
!= LDAP_SUCCESS)
debug_printf ("ldap_set_option(LDAP_OPT_ENCRYPT) error 0x%02x", ret);
if ((ret = ldap_set_option (lh, LDAP_OPT_TIMELIMIT, &timelimit))
!= LDAP_SUCCESS)
debug_printf ("ldap_set_option(LDAP_OPT_TIMELIMIT) error 0x%02x", ret);
if ((ret = ldap_bind_s (lh, NULL, NULL, LDAP_AUTH_NEGOTIATE)) != LDAP_SUCCESS)
{
debug_printf ("ldap_bind(%W) 0x%02x", domain, ret);
ldap_unbind (lh);
lh = NULL;
return false;
}
return true;
}
bool
cyg_ldap::open (PCWSTR domain)
{
LARGE_INTEGER start, stop;
static LARGE_INTEGER last_rediscover;
ULONG ret;
close ();
GetSystemTimeAsFileTime ((LPFILETIME) &start);
/* FIXME? connect_ssl can take ages even when failing, so we're trying to
do everything the non-SSL (but still encrypted) way. */
if (/*!connect_ssl (NULL) && */ !connect_non_ssl (domain))
return false;
/* For some obscure reason, there's a chance that the ldap_bind_s call takes
a long time, if the current primary DC is... well, burping or something.
If so, we rediscover in the background which usually switches to the next
fastest DC. */
GetSystemTimeAsFileTime ((LPFILETIME) &stop);
if ((stop.QuadPart - start.QuadPart) >= 3000000LL /* 0.3s */
&& (stop.QuadPart - last_rediscover.QuadPart) >= 30000000LL) /* 3s */
{
debug_printf ("ldap_bind_s is laming. Try to rediscover.");
HANDLE thr = CreateThread (&sec_none_nih, 4 * PTHREAD_STACK_MIN,
rediscover_thread, (LPVOID) domain,
STACK_SIZE_PARAM_IS_A_RESERVATION, NULL);
if (!thr)
debug_printf ("Couldn't start rediscover thread.");
else
{
last_rediscover = stop;
CloseHandle (thr);
}
}
if ((ret = ldap_search_stW (lh, NULL, LDAP_SCOPE_BASE,
(PWCHAR) L"(objectclass=*)", rootdse_attr,
0, &tv, &msg))
!= LDAP_SUCCESS)
{
debug_printf ("ldap_search(%W, ROOTDSE) error 0x%02x", domain, ret);
goto err;
}
if (!(entry = ldap_first_entry (lh, msg)))
{
debug_printf ("No ROOTDSE entry for %W", domain);
goto err;
}
if (!(val = ldap_get_valuesW (lh, entry, rootdse_attr[0])))
{
debug_printf ("No ROOTDSE value for %W", domain);
goto err;
}
if (!(rootdse = wcsdup (val[0])))
{
debug_printf ("wcsdup(%W, ROOTDSE) %d", domain, get_errno ());
goto err;
}
ldap_value_freeW (val);
if ((val = ldap_get_valuesW (lh, entry, rootdse_attr[1])))
{
for (ULONG idx = 0; idx < ldap_count_valuesW (val); ++idx)
if (!wcscmp (val[idx], LDAP_CAP_ACTIVE_DIRECTORY_OID_W))
{
isAD = true;
break;
}
}
ldap_value_freeW (val);
val = NULL;
ldap_memfreeW ((PWCHAR) msg);
msg = entry = NULL; return true;
err:
close ();
return false;
}
void
cyg_ldap::close ()
{
if (lh)
ldap_unbind (lh);
if (msg)
ldap_memfreeW ((PWCHAR) msg);
if (val)
ldap_value_freeW (val);
if (rootdse)
free (rootdse);
lh = NULL;
msg = entry = NULL;
val = NULL;
rootdse = NULL;
}
bool
cyg_ldap::fetch_ad_account (PSID sid, bool group)
{
WCHAR filter[512], *f;
LONG len = (LONG) RtlLengthSid (sid);
PBYTE s = (PBYTE) sid;
static WCHAR hex_wchars[] = L"0123456789abcdef";
ULONG ret;
if (msg)
{
ldap_memfreeW ((PWCHAR) msg);
msg = entry = NULL;
}
if (val)
{
ldap_value_freeW (val);
val = NULL;
}
f = wcpcpy (filter, L"(objectSid=");
while (len-- > 0)
{
*f++ = L'\\';
*f++ = hex_wchars[*s >> 4];
*f++ = hex_wchars[*s++ & 0xf];
}
wcpcpy (f, L")");
attr = group ? group_attr : user_attr;
if ((ret = ldap_search_stW (lh, rootdse, LDAP_SCOPE_SUBTREE, filter,
attr, 0, &tv, &msg)) != LDAP_SUCCESS)
{
debug_printf ("ldap_search_stW(%W,%W) error 0x%02x",
rootdse, filter, ret);
return false;
}
if (!(entry = ldap_first_entry (lh, msg)))
{
debug_printf ("No entry for %W in rootdse %W", filter, rootdse);
return false;
}
return true;
}
uint32_t
cyg_ldap::fetch_posix_offset_for_domain (PCWSTR domain)
{
WCHAR filter[512];
ULONG ret;
if (msg)
{
ldap_memfreeW ((PWCHAR) msg);
msg = entry = NULL;
}
if (val)
{
ldap_value_freeW (val);
val = NULL;
}
/* If domain name has no dot, it's a Netbios name. In that case, filter
by flatName rather than by name. */
__small_swprintf (filter, L"(&(objectClass=trustedDomain)(%W=%W))",
wcschr (domain, L'.') ? L"name" : L"flatName", domain);
if ((ret = ldap_search_stW (lh, rootdse, LDAP_SCOPE_SUBTREE, filter,
attr = tdom_attr, 0, &tv, &msg)) != LDAP_SUCCESS)
{
debug_printf ("ldap_search_stW(%W,%W) error 0x%02x",
rootdse, filter, ret);
return 0;
}
if (!(entry = ldap_first_entry (lh, msg)))
{
debug_printf ("No entry for %W in rootdse %W", filter, rootdse);
return 0;
}
return get_num_attribute (0);
}
PWCHAR
cyg_ldap::get_string_attribute (int idx)
{
if (val)
ldap_value_freeW (val);
val = ldap_get_valuesW (lh, entry, attr[idx]);
if (val)
return val[0];
return NULL;
}
uint32_t
cyg_ldap::get_num_attribute (int idx)
{
PWCHAR ret = get_string_attribute (idx);
if (ret)
return (uint32_t) wcstoul (ret, NULL, 10);
return (uint32_t) -1;
}
bool
cyg_ldap::fetch_unix_sid_from_ad (uint32_t id, cygsid &sid, bool group)
{
WCHAR filter[512];
ULONG ret;
PLDAP_BERVAL *bval;
if (msg)
{
ldap_memfreeW ((PWCHAR) msg);
msg = entry = NULL;
}
if (group)
__small_swprintf (filter, L"(&(objectClass=Group)(gidNumber=%u))", id);
else
__small_swprintf (filter, L"(&(objectClass=User)(uidNumber=%u))", id);
if ((ret = ldap_search_stW (lh, rootdse, LDAP_SCOPE_SUBTREE, filter,
nfs_attr, 0, &tv, &msg)) != LDAP_SUCCESS)
{
debug_printf ("ldap_search_stW(%W,%W) error 0x%02x",
rootdse, filter, ret);
return false;
}
if ((entry = ldap_first_entry (lh, msg))
&& (bval = ldap_get_values_lenW (lh, entry, nfs_attr[0])))
{
sid = (PSID) bval[0]->bv_val;
ldap_value_free_len (bval);
}
return true;
}
PWCHAR
cyg_ldap::fetch_unix_name_from_rfc2307 (uint32_t id, bool group)
{
WCHAR filter[512];
ULONG ret;
if (msg)
{
ldap_memfreeW ((PWCHAR) msg);
msg = entry = NULL;
}
if (val)
{
ldap_value_freeW (val);
val = NULL;
}
attr = group ? rfc2307_gid_attr : rfc2307_uid_attr;
if (group)
__small_swprintf (filter, L"(&(objectClass=posixGroup)(gidNumber=%u))", id);
else
__small_swprintf (filter, L"(&(objectClass=posixAccount)(uidNumber=%u))",
id);
if ((ret = ldap_search_stW (lh, rootdse, LDAP_SCOPE_SUBTREE, filter, attr,
0, &tv, &msg)) != LDAP_SUCCESS)
{
debug_printf ("ldap_search_stW(%W,%W) error 0x%02x",
rootdse, filter, ret);
return NULL;
}
if (!(entry = ldap_first_entry (lh, msg)))
{
debug_printf ("No entry for %W in rootdse %W", filter, rootdse);
return NULL;
}
return get_string_attribute (0);
}
uid_t
cyg_ldap::remap_uid (uid_t uid)
{
cygsid user (NO_SID);
PWCHAR name;
struct passwd *pw;
if (isAD)
{
if (fetch_unix_sid_from_ad (uid, user, false)
&& user != NO_SID
&& (pw = internal_getpwsid (user)))
return pw->pw_uid;
}
else if ((name = fetch_unix_name_from_rfc2307 (uid, false)))
{
char *mbname = NULL;
sys_wcstombs_alloc (&mbname, HEAP_NOTHEAP, name);
if ((pw = internal_getpwnam (mbname)))
return pw->pw_uid;
}
return ILLEGAL_UID;
}
gid_t
cyg_ldap::remap_gid (gid_t gid)
{
cygsid group (NO_SID);
PWCHAR name;
struct group *gr;
if (isAD)
{
if (fetch_unix_sid_from_ad (gid, group, true)
&& group != NO_SID
&& (gr = internal_getgrsid (group)))
return gr->gr_gid;
}
else if ((name = fetch_unix_name_from_rfc2307 (gid, true)))
{
char *mbname = NULL;
sys_wcstombs_alloc (&mbname, HEAP_NOTHEAP, name);
if ((gr = internal_getgrnam (mbname)))
return gr->gr_gid;
}
return ILLEGAL_GID;
}
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