490 lines
11 KiB
C++
490 lines
11 KiB
C++
/* ldap.cc: Helper functions for ldap access to Active Directory.
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Copyright 2014 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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#include "winsup.h"
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#include "ldap.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 "cygheap.h"
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#include "registry.h"
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#include "pinfo.h"
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#include "lm.h"
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#include "dsgetdc.h"
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#include "tls_pbuf.h"
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static LDAP_TIMEVAL tv = { 3, 0 };
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static PWCHAR rootdse_attr[] =
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{
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(PWCHAR) L"defaultNamingContext",
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(PWCHAR) L"supportedCapabilities",
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NULL
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};
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static PWCHAR user_attr[] =
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{
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(PWCHAR) L"uid",
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(PWCHAR) L"primaryGroupID",
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(PWCHAR) L"gecos",
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(PWCHAR) L"unixHomeDirectory",
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(PWCHAR) L"loginShell",
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(PWCHAR) L"uidNumber",
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NULL
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};
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static PWCHAR group_attr[] =
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{
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(PWCHAR) L"cn",
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(PWCHAR) L"gidNumber",
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NULL
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};
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PWCHAR tdom_attr[] =
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{
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(PWCHAR) L"trustPosixOffset",
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NULL
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};
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PWCHAR sid_attr[] =
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{
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(PWCHAR) L"objectSid",
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NULL
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};
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PWCHAR rfc2307_uid_attr[] =
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{
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(PWCHAR) L"uid",
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NULL
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};
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PWCHAR rfc2307_gid_attr[] =
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{
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(PWCHAR) L"cn",
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NULL
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};
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bool
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cyg_ldap::connect_ssl (PCWSTR domain)
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{
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ULONG ret, timelimit = 3; /* secs */
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if (!(lh = ldap_sslinitW ((PWCHAR) domain, LDAP_SSL_PORT, 1)))
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{
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debug_printf ("ldap_init(%W) error 0x%02x", domain, LdapGetLastError ());
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return false;
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}
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if ((ret = ldap_set_option (lh, LDAP_OPT_TIMELIMIT, &timelimit))
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!= LDAP_SUCCESS)
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debug_printf ("ldap_set_option(LDAP_OPT_TIMELIMIT) error 0x%02x", ret);
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if ((ret = ldap_bind_s (lh, NULL, NULL, LDAP_AUTH_NEGOTIATE)) != LDAP_SUCCESS)
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{
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debug_printf ("ldap_bind(%W) 0x%02x", domain, ret);
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ldap_unbind (lh);
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lh = NULL;
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return false;
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}
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return true;
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}
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bool
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cyg_ldap::connect_non_ssl (PCWSTR domain)
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{
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ULONG ret, timelimit = 3; /* secs */
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if (!(lh = ldap_initW ((PWCHAR) domain, LDAP_PORT)))
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{
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debug_printf ("ldap_init(%W) error 0x%02x", domain, LdapGetLastError ());
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return false;
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}
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if ((ret = ldap_set_option (lh, LDAP_OPT_SIGN, LDAP_OPT_ON))
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!= LDAP_SUCCESS)
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debug_printf ("ldap_set_option(LDAP_OPT_SIGN) error 0x%02x", ret);
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if ((ret = ldap_set_option (lh, LDAP_OPT_ENCRYPT, LDAP_OPT_ON))
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!= LDAP_SUCCESS)
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debug_printf ("ldap_set_option(LDAP_OPT_ENCRYPT) error 0x%02x", ret);
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if ((ret = ldap_set_option (lh, LDAP_OPT_TIMELIMIT, &timelimit))
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!= LDAP_SUCCESS)
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debug_printf ("ldap_set_option(LDAP_OPT_TIMELIMIT) error 0x%02x", ret);
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if ((ret = ldap_bind_s (lh, NULL, NULL, LDAP_AUTH_NEGOTIATE)) != LDAP_SUCCESS)
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{
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debug_printf ("ldap_bind(%W) 0x%02x", domain, ret);
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ldap_unbind (lh);
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lh = NULL;
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return false;
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}
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return true;
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}
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bool
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cyg_ldap::open (PCWSTR domain)
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{
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ULONG ret;
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/* Already open? */
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if (lh)
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return true;
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/* FIXME? connect_ssl can take ages even when failing, so we're trying to
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do everything the non-SSL (but still encrypted) way. */
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if (/*!connect_ssl (NULL) && */ !connect_non_ssl (domain))
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return false;
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if ((ret = ldap_search_stW (lh, NULL, LDAP_SCOPE_BASE,
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(PWCHAR) L"(objectclass=*)", rootdse_attr,
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0, &tv, &msg))
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!= LDAP_SUCCESS)
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{
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debug_printf ("ldap_search(%W, ROOTDSE) error 0x%02x", domain, ret);
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goto err;
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}
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if (!(entry = ldap_first_entry (lh, msg)))
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{
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debug_printf ("No ROOTDSE entry for %W", domain);
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goto err;
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}
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if (!(val = ldap_get_valuesW (lh, entry, rootdse_attr[0])))
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{
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debug_printf ("No ROOTDSE value for %W", domain);
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goto err;
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}
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if (!(rootdse = wcsdup (val[0])))
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{
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debug_printf ("wcsdup(%W, ROOTDSE) %d", domain, get_errno ());
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goto err;
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}
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ldap_value_freeW (val);
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if ((val = ldap_get_valuesW (lh, entry, rootdse_attr[1])))
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{
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for (ULONG idx = 0; idx < ldap_count_valuesW (val); ++idx)
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if (!wcscmp (val[idx], LDAP_CAP_ACTIVE_DIRECTORY_OID_W))
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{
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isAD = true;
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break;
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}
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}
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ldap_value_freeW (val);
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val = NULL;
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ldap_memfreeW ((PWCHAR) msg);
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msg = entry = NULL; return true;
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err:
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close ();
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return false;
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}
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void
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cyg_ldap::close ()
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{
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if (msg_id != (ULONG) -1)
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ldap_abandon (lh, msg_id);
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if (lh)
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ldap_unbind (lh);
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if (msg)
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ldap_memfreeW ((PWCHAR) msg);
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if (val)
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ldap_value_freeW (val);
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if (rootdse)
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free (rootdse);
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lh = NULL;
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msg = entry = NULL;
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val = NULL;
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rootdse = NULL;
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msg_id = (ULONG) -1;
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}
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bool
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cyg_ldap::fetch_ad_account (PSID sid, bool group)
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{
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WCHAR filter[140], *f;
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LONG len = (LONG) RtlLengthSid (sid);
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PBYTE s = (PBYTE) sid;
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static WCHAR hex_wchars[] = L"0123456789abcdef";
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ULONG ret;
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if (msg)
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{
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ldap_memfreeW ((PWCHAR) msg);
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msg = entry = NULL;
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}
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if (val)
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{
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ldap_value_freeW (val);
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val = NULL;
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}
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f = wcpcpy (filter, L"(objectSid=");
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while (len-- > 0)
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{
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*f++ = L'\\';
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*f++ = hex_wchars[*s >> 4];
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*f++ = hex_wchars[*s++ & 0xf];
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}
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wcpcpy (f, L")");
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attr = group ? group_attr : user_attr;
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if ((ret = ldap_search_stW (lh, rootdse, LDAP_SCOPE_SUBTREE, filter,
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attr, 0, &tv, &msg)) != LDAP_SUCCESS)
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{
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debug_printf ("ldap_search_stW(%W,%W) error 0x%02x",
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rootdse, filter, ret);
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return false;
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}
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if (!(entry = ldap_first_entry (lh, msg)))
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{
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debug_printf ("No entry for %W in rootdse %W", filter, rootdse);
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return false;
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}
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return true;
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}
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bool
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cyg_ldap::enumerate_ad_accounts (PCWSTR domain, bool group)
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{
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tmp_pathbuf tp;
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PCWSTR filter;
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close ();
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if (!open (domain))
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return false;
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if (!group)
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filter = L"(&(objectClass=User)"
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"(objectCategory=Person)"
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/* 512 == ADS_UF_NORMAL_ACCOUNT */
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"(userAccountControl:" LDAP_MATCHING_RULE_BIT_AND ":=512)"
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"(objectSid=*))";
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else if (!domain)
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filter = L"(&(objectClass=Group)"
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"(objectSid=*))";
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else
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filter = L"(&(objectClass=Group)"
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/* 1 == ACCOUNT_GROUP */
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"(!(groupType:" LDAP_MATCHING_RULE_BIT_AND ":=1))"
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"(objectSid=*))";
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msg_id = ldap_searchW (lh, rootdse, LDAP_SCOPE_SUBTREE, (PWCHAR) filter,
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sid_attr, 0);
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if (msg_id == (ULONG) -1)
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{
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debug_printf ("ldap_searchW(%W,%W) error 0x%02x", rootdse, filter,
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LdapGetLastError ());
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return false;
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}
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return true;
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}
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bool
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cyg_ldap::next_account (cygsid &sid)
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{
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ULONG ret;
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PLDAP_BERVAL *bval;
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if (msg)
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{
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ldap_memfreeW ((PWCHAR) msg);
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msg = entry = NULL;
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}
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if (val)
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{
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ldap_value_freeW (val);
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val = NULL;
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}
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ret = ldap_result (lh, msg_id, LDAP_MSG_ONE, &tv, &msg);
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if (ret == 0)
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{
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debug_printf ("ldap_result() timeout!");
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return false;
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}
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if (ret == (ULONG) -1)
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{
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debug_printf ("ldap_result() error 0x%02x", LdapGetLastError ());
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return false;
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}
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if ((entry = ldap_first_entry (lh, msg))
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&& (bval = ldap_get_values_lenW (lh, entry, sid_attr[0])))
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{
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sid = (PSID) bval[0]->bv_val;
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ldap_value_free_len (bval);
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return true;
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}
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return false;
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}
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uint32_t
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cyg_ldap::fetch_posix_offset_for_domain (PCWSTR domain)
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{
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WCHAR filter[300];
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ULONG ret;
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if (msg)
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{
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ldap_memfreeW ((PWCHAR) msg);
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msg = entry = NULL;
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}
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if (val)
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{
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ldap_value_freeW (val);
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val = NULL;
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}
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/* If domain name has no dot, it's a Netbios name. In that case, filter
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by flatName rather than by name. */
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__small_swprintf (filter, L"(&(objectClass=trustedDomain)(%W=%W))",
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wcschr (domain, L'.') ? L"name" : L"flatName", domain);
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if ((ret = ldap_search_stW (lh, rootdse, LDAP_SCOPE_SUBTREE, filter,
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attr = tdom_attr, 0, &tv, &msg)) != LDAP_SUCCESS)
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{
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debug_printf ("ldap_search_stW(%W,%W) error 0x%02x",
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rootdse, filter, ret);
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return 0;
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}
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if (!(entry = ldap_first_entry (lh, msg)))
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{
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debug_printf ("No entry for %W in rootdse %W", filter, rootdse);
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return 0;
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}
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return get_num_attribute (0);
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}
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PWCHAR
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cyg_ldap::get_string_attribute (int idx)
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{
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if (val)
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ldap_value_freeW (val);
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val = ldap_get_valuesW (lh, entry, attr[idx]);
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if (val)
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return val[0];
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return NULL;
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}
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uint32_t
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cyg_ldap::get_num_attribute (int idx)
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{
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PWCHAR ret = get_string_attribute (idx);
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if (ret)
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return (uint32_t) wcstoul (ret, NULL, 10);
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return (uint32_t) -1;
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}
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bool
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cyg_ldap::fetch_unix_sid_from_ad (uint32_t id, cygsid &sid, bool group)
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{
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WCHAR filter[48];
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ULONG ret;
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PLDAP_BERVAL *bval;
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if (msg)
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{
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ldap_memfreeW ((PWCHAR) msg);
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msg = entry = NULL;
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}
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if (group)
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__small_swprintf (filter, L"(&(objectClass=Group)(gidNumber=%u))", id);
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else
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__small_swprintf (filter, L"(&(objectClass=User)(uidNumber=%u))", id);
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if ((ret = ldap_search_stW (lh, rootdse, LDAP_SCOPE_SUBTREE, filter,
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sid_attr, 0, &tv, &msg)) != LDAP_SUCCESS)
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{
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debug_printf ("ldap_search_stW(%W,%W) error 0x%02x",
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rootdse, filter, ret);
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return false;
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}
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if ((entry = ldap_first_entry (lh, msg))
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&& (bval = ldap_get_values_lenW (lh, entry, sid_attr[0])))
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{
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sid = (PSID) bval[0]->bv_val;
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ldap_value_free_len (bval);
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return true;
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}
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return false;
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}
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PWCHAR
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cyg_ldap::fetch_unix_name_from_rfc2307 (uint32_t id, bool group)
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{
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WCHAR filter[52];
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ULONG ret;
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if (msg)
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{
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ldap_memfreeW ((PWCHAR) msg);
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msg = entry = NULL;
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}
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if (val)
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{
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ldap_value_freeW (val);
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val = NULL;
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}
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attr = group ? rfc2307_gid_attr : rfc2307_uid_attr;
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if (group)
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__small_swprintf (filter, L"(&(objectClass=posixGroup)(gidNumber=%u))", id);
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else
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__small_swprintf (filter, L"(&(objectClass=posixAccount)(uidNumber=%u))",
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id);
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if ((ret = ldap_search_stW (lh, rootdse, LDAP_SCOPE_SUBTREE, filter, attr,
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0, &tv, &msg)) != LDAP_SUCCESS)
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{
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debug_printf ("ldap_search_stW(%W,%W) error 0x%02x",
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rootdse, filter, ret);
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return NULL;
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}
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if (!(entry = ldap_first_entry (lh, msg)))
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{
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debug_printf ("No entry for %W in rootdse %W", filter, rootdse);
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return NULL;
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}
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return get_string_attribute (0);
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}
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uid_t
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cyg_ldap::remap_uid (uid_t uid)
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{
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cygsid user (NO_SID);
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PWCHAR name;
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struct passwd *pw;
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if (isAD)
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{
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if (fetch_unix_sid_from_ad (uid, user, false)
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&& user != NO_SID
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&& (pw = internal_getpwsid (user, this)))
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return pw->pw_uid;
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}
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else if ((name = fetch_unix_name_from_rfc2307 (uid, false)))
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{
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char *mbname = NULL;
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sys_wcstombs_alloc (&mbname, HEAP_NOTHEAP, name);
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if ((pw = internal_getpwnam (mbname)))
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return pw->pw_uid;
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}
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return ILLEGAL_UID;
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}
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gid_t
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cyg_ldap::remap_gid (gid_t gid)
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{
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cygsid group (NO_SID);
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PWCHAR name;
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struct group *gr;
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if (isAD)
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{
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if (fetch_unix_sid_from_ad (gid, group, true)
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&& group != NO_SID
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&& (gr = internal_getgrsid (group, this)))
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return gr->gr_gid;
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}
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else if ((name = fetch_unix_name_from_rfc2307 (gid, true)))
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{
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char *mbname = NULL;
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sys_wcstombs_alloc (&mbname, HEAP_NOTHEAP, name);
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if ((gr = internal_getgrnam (mbname)))
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return gr->gr_gid;
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}
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return ILLEGAL_GID;
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}
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