898e26c82f
* ldap.cc (cyg_ldap::fetch_posix_offset_for_domain): Return UINT32_MAX in case of error. * security.h (PRIMARY_POSIX_OFFSET): Define. (NOACCESS_POSIX_OFFSET): Define. (UNUSABLE_POSIX_OFFSET): Define. * uinfo.cc (cygheap_domain_info::init): Drop initializing lowest_tdo_posix_offset. (pwdgrp::fetch_account_from_file): Set PosixOffset to either UNUSABLE_POSIX_OFFSET or NOACCESS_POSIX_OFFSET in case we don't get a sensible offset from AD. Explain why. Drop setting ch lowest_tdo_posix_offset. (pwdgrp::fetch_account_from_windows): Replace constant 0x100000 with PRIMARY_POSIX_OFFSET throughout.
630 lines
15 KiB
C++
630 lines
15 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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#define CYG_LDAP_ENUM_PAGESIZE 100 /* entries per page */
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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"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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/* ================================================================= */
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/* Helper methods. */
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/* ================================================================= */
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inline int
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cyg_ldap::map_ldaperr_to_errno (ULONG lerr)
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{
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switch (lerr)
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{
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case LDAP_SUCCESS:
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return NO_ERROR;
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case LDAP_NO_RESULTS_RETURNED:
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/* LdapMapErrorToWin32 maps LDAP_NO_RESULTS_RETURNED to ERROR_MORE_DATA,
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which in turn is mapped to EMSGSIZE by geterrno_from_win_error. This
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is SO wrong, especially considering that LDAP_MORE_RESULTS_TO_RETURN
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is mapped to ERROR_MORE_DATA as well :-P */
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return ENMFILE;
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default:
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break;
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}
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return geterrno_from_win_error (LdapMapErrorToWin32 (lerr));
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}
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inline int
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cyg_ldap::wait (cygthread *thr)
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{
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if (!thr)
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return EIO;
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if (cygwait (*thr, INFINITE, cw_sig | cw_sig_eintr) != WAIT_OBJECT_0)
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{
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thr->terminate_thread ();
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_my_tls.call_signal_handler ();
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return EINTR;
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}
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thr->detach ();
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return 0;
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}
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/* ================================================================= */
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/* Helper struct and functions for interruptible LDAP initalization. */
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/* ================================================================= */
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struct cyg_ldap_init {
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cyg_ldap *that;
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PCWSTR domain;
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bool ssl;
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ULONG ret;
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};
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ULONG
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cyg_ldap::connect_ssl (PCWSTR domain)
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{
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ULONG ret;
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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 LdapGetLastError ();
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}
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if ((ret = ldap_bind_s (lh, NULL, NULL, LDAP_AUTH_NEGOTIATE)) != LDAP_SUCCESS)
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debug_printf ("ldap_bind(%W) 0x%02x", domain, ret);
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else if ((ret = ldap_search_sW (lh, NULL, LDAP_SCOPE_BASE,
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(PWCHAR) L"(objectclass=*)", rootdse_attr,
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0, &msg))
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!= LDAP_SUCCESS)
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debug_printf ("ldap_search(%W, ROOTDSE) error 0x%02x", domain, ret);
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return ret;
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}
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ULONG
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cyg_ldap::connect_non_ssl (PCWSTR domain)
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{
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ULONG ret;
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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 LdapGetLastError ();
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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_bind_s (lh, NULL, NULL, LDAP_AUTH_NEGOTIATE)) != LDAP_SUCCESS)
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debug_printf ("ldap_bind(%W) 0x%02x", domain, ret);
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else if ((ret = ldap_search_sW (lh, NULL, LDAP_SCOPE_BASE,
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(PWCHAR) L"(objectclass=*)", rootdse_attr,
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0, &msg))
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!= LDAP_SUCCESS)
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debug_printf ("ldap_search(%W, ROOTDSE) error 0x%02x", domain, ret);
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return ret;
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}
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static DWORD WINAPI
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ldap_init_thr (LPVOID param)
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{
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cyg_ldap_init *cl = (cyg_ldap_init *) param;
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cl->ret = cl->ssl ? cl->that->connect_ssl (cl->domain)
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: cl->that->connect_non_ssl (cl->domain);
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return 0;
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}
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inline int
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cyg_ldap::connect (PCWSTR domain)
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{
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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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cyg_ldap_init cl = { this, domain, false, NO_ERROR };
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cygthread *thr = new cygthread (ldap_init_thr, &cl, "ldap_init");
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return wait (thr) ?: map_ldaperr_to_errno (cl.ret);
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}
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/* ================================================================= */
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/* Helper struct and functions for interruptible LDAP search. */
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/* ================================================================= */
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struct cyg_ldap_search {
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cyg_ldap *that;
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PWCHAR base;
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PWCHAR filter;
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PWCHAR *attrs;
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ULONG ret;
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};
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ULONG
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cyg_ldap::search_s (PWCHAR base, PWCHAR filter, PWCHAR *attrs)
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{
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ULONG ret;
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if ((ret = ldap_search_sW (lh, base, LDAP_SCOPE_SUBTREE, filter,
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attrs, 0, &msg)) != LDAP_SUCCESS)
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debug_printf ("ldap_search_sW(%W,%W) error 0x%02x", base, filter, ret);
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return ret;
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}
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static DWORD WINAPI
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ldap_search_thr (LPVOID param)
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{
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cyg_ldap_search *cl = (cyg_ldap_search *) param;
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cl->ret = cl->that->search_s (cl->base, cl->filter, cl->attrs);
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return 0;
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}
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inline int
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cyg_ldap::search (PWCHAR base, PWCHAR filter, PWCHAR *attrs)
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{
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cyg_ldap_search cl = { this, base, filter, attrs, NO_ERROR };
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cygthread *thr = new cygthread (ldap_search_thr, &cl, "ldap_search");
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return wait (thr) ?: map_ldaperr_to_errno (cl.ret);
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}
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/* ================================================================= */
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/* Helper struct and functions for interruptible LDAP page search. */
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/* ================================================================= */
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struct cyg_ldap_next_page {
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cyg_ldap *that;
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ULONG ret;
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};
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ULONG
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cyg_ldap::next_page_s ()
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{
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ULONG total;
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ULONG ret;
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do
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{
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ret = ldap_get_next_page_s (lh, srch_id, NULL, CYG_LDAP_ENUM_PAGESIZE,
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&total, &srch_msg);
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}
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while (ret == LDAP_SUCCESS && ldap_count_entries (lh, srch_msg) == 0);
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if (ret && ret != LDAP_NO_RESULTS_RETURNED)
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debug_printf ("ldap_result() error 0x%02x", ret);
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return ret;
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}
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static DWORD WINAPI
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ldap_next_page_thr (LPVOID param)
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{
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cyg_ldap_next_page *cl = (cyg_ldap_next_page *) param;
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cl->ret = cl->that->next_page_s ();
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return 0;
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}
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inline int
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cyg_ldap::next_page ()
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{
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cyg_ldap_next_page cl = { this, NO_ERROR };
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cygthread *thr = new cygthread (ldap_next_page_thr, &cl, "ldap_next_page");
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return wait (thr) ?: map_ldaperr_to_errno (cl.ret);
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}
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/* ================================================================= */
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/* Public methods. */
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/* ================================================================= */
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int
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cyg_ldap::open (PCWSTR domain)
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{
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int ret = 0;
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/* Already open? */
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if (lh)
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return 0;
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if ((ret = connect (domain)) != NO_ERROR)
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goto err;
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/* Prime `ret' and fetch ROOTDSE search result. */
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ret = EIO;
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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_msgfree (msg);
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msg = entry = NULL;
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return 0;
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err:
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close ();
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return ret;
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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 (srch_id != NULL)
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ldap_search_abandon_page (lh, srch_id);
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if (lh)
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ldap_unbind (lh);
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if (srch_msg)
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ldap_msgfree (srch_msg);
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if (msg)
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ldap_msgfree (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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srch_id = NULL;
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srch_msg = srch_entry = NULL;
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}
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bool
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cyg_ldap::fetch_ad_account (PSID sid, bool group, PCWSTR domain)
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{
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WCHAR filter[140], *f, *rdse = rootdse;
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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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tmp_pathbuf tp;
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if (msg)
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{
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ldap_msgfree (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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if (domain)
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{
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/* FIXME: This is a hack. The most correct solution is probably to
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open a connection to the DC of the trusted domain. But this always
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takes extra time, so we're trying to avoid it. If this results in
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problems, we know what to do. */
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rdse = tp.w_get ();
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PWCHAR r = rdse;
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for (PWCHAR dotp = (PWCHAR) domain; dotp && *dotp; domain = dotp)
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{
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dotp = wcschr (domain, L'.');
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if (dotp)
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*dotp++ = L'\0';
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if (r > rdse)
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*r++ = L',';
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r = wcpcpy (r, L"DC=");
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r = wcpcpy (r, domain);
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}
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}
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attr = group ? group_attr : user_attr;
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if (search (rdse, filter, attr) != 0)
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return false;
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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, rdse);
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return false;
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}
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return true;
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}
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int
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cyg_ldap::enumerate_ad_accounts (PCWSTR domain, bool group)
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{
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int ret;
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tmp_pathbuf tp;
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PCWSTR filter;
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close ();
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if ((ret = open (domain)) != NO_ERROR)
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return ret;
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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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srch_id = ldap_search_init_pageW (lh, rootdse, LDAP_SCOPE_SUBTREE,
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(PWCHAR) filter, sid_attr, 0, NULL, NULL,
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INFINITE, CYG_LDAP_ENUM_PAGESIZE, NULL);
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if (srch_id == NULL)
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{
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debug_printf ("ldap_search_init_pageW(%W,%W) error 0x%02x",
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rootdse, filter, LdapGetLastError ());
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return map_ldaperr_to_errno (LdapGetLastError ());
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}
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return NO_ERROR;
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}
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int
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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 (srch_entry)
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{
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if ((srch_entry = ldap_next_entry (lh, srch_entry))
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&& (bval = ldap_get_values_lenW (lh, srch_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 NO_ERROR;
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}
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ldap_msgfree (srch_msg);
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srch_msg = srch_entry = NULL;
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}
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ret = next_page ();
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if (ret == NO_ERROR)
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{
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if ((srch_entry = ldap_first_entry (lh, srch_msg))
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&& (bval = ldap_get_values_lenW (lh, srch_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 NO_ERROR;
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}
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ret = EIO;
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}
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ldap_search_abandon_page (lh, srch_id);
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srch_id = NULL;
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return ret;
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}
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/* Return UINT32_MAX on error to allow differing between not being able
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to fetch a value and a real 0 offset. */
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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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if (msg)
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{
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ldap_msgfree (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 (search (rootdse, filter, attr = tdom_attr) != 0)
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return UINT32_MAX;
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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 UINT32_MAX;
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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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|
{
|
|
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[48];
|
|
PLDAP_BERVAL *bval;
|
|
|
|
if (msg)
|
|
{
|
|
ldap_msgfree (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 (search (rootdse, filter, sid_attr) != 0)
|
|
return false;
|
|
if ((entry = ldap_first_entry (lh, msg))
|
|
&& (bval = ldap_get_values_lenW (lh, entry, sid_attr[0])))
|
|
{
|
|
sid = (PSID) bval[0]->bv_val;
|
|
ldap_value_free_len (bval);
|
|
return true;
|
|
}
|
|
return false;
|
|
}
|
|
|
|
PWCHAR
|
|
cyg_ldap::fetch_unix_name_from_rfc2307 (uint32_t id, bool group)
|
|
{
|
|
WCHAR filter[52];
|
|
|
|
if (msg)
|
|
{
|
|
ldap_msgfree (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 (search (rootdse, filter, attr) != 0)
|
|
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, this)))
|
|
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, this)))
|
|
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;
|
|
}
|