ldap.c
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/*
* "Software pw3270, desenvolvido com base nos códigos fontes do WC3270 e X3270
* (Paul Mattes Paul.Mattes@usa.net), de emulação de terminal 3270 para acesso a
* aplicativos mainframe. Registro no INPI sob o nome G3270.
*
* Copyright (C) <2008> <Banco do Brasil S.A.>
*
* Este programa é software livre. Você pode redistribuí-lo e/ou modificá-lo sob
* os termos da GPL v.2 - Licença Pública Geral GNU, conforme publicado pela
* Free Software Foundation.
*
* Este programa é distribuído na expectativa de ser útil, mas SEM QUALQUER
* GARANTIA; sem mesmo a garantia implícita de COMERCIALIZAÇÃO ou de ADEQUAÇÃO
* A QUALQUER PROPÓSITO EM PARTICULAR. Consulte a Licença Pública Geral GNU para
* obter mais detalhes.
*
* Você deve ter recebido uma cópia da Licença Pública Geral GNU junto com este
* programa; se não, escreva para a Free Software Foundation, Inc., 51 Franklin
* St, Fifth Floor, Boston, MA 02110-1301 USA
*
* Este programa está nomeado como - e possui - linhas de código.
*
* Contatos:
*
* perry.werneck@gmail.com (Alexandre Perry de Souza Werneck)
* erico.mendonca@gmail.com (Erico Mascarenhas Mendonça)
*
* References:
*
* https://docs.microsoft.com/en-us/windows/win32/api/winldap/
* https://github.com/curl/curl/blob/curl-7_62_0/lib/ldap.c
* http://forums.codeguru.com/showthread.php?313123-Elementary-problems-using-winldap
* https://stackoverflow.com/questions/21501002/how-to-use-ldap-sasl-bind-in-winldap
*
*/
#include <config.h>
#if defined(HAVE_LIBSSL) && defined(SSL_ENABLE_CRL_CHECK) && defined(HAVE_LDAP)
#include "private.h"
#include <winldap.h>
#include <utilc.h>
#include <lib3270/toggle.h>
# ifndef LDAP_VENDOR_NAME
# error Your Platform SDK is NOT sufficient for LDAP support! \
Update your Platform SDK, or disable LDAP support!
# else
# include <winber.h>
# endif
/*--[ Implement ]------------------------------------------------------------------------------------*/
static inline void lib3270_autoptr_cleanup_LDAP(LDAP **ptr)
{
debug("%s(%p)",__FUNCTION__,*ptr);
if(*ptr)
{
ldap_unbind(*ptr);
*ptr = NULL;
}
}
static inline void lib3270_autoptr_cleanup_LDAPMessage(LDAPMessage **message)
{
debug("%s(%p)",__FUNCTION__,*message);
if(message)
ldap_msgfree(*message);
*message = NULL;
}
static inline void lib3270_autoptr_cleanup_LDAPPTR(char **ptr)
{
debug("%s(%p)",__FUNCTION__,*ptr);
if(*ptr)
ldap_memfree(*ptr);
*ptr = NULL;
}
static inline void lib3270_autoptr_cleanup_BerElement(BerElement **ber)
{
debug("%s(%p)",__FUNCTION__,*ber);
if(*ber)
ber_free(*ber, 0);
*ber = NULL;
}
X509_CRL * get_crl_using_ldap(H3270 *hSession, SSL_ERROR_MESSAGE * message, const char *consturl)
{
X509_CRL * x509_crl = NULL;
int rc = 0;
// Strip query.
lib3270_autoptr(char) urldup = lib3270_unescape(consturl);
char * url = urldup+7;
char * base = strchr(url,'/');
char * port;
char * attrs[] = { NULL, NULL };
if(!base)
{
message->error = hSession->ssl.error = 0;
message->title = _( "Security error" );
message->text = _( "No DN of the entry at which to start the search on the URL" );
message->description = _( "The URL argument should be in the format ldap://[HOST]/[DN]?attribute" );
debug("%s",message->text);
errno = EINVAL;
return NULL;
}
*(base++) = 0;
attrs[0] = strchr(base,'?');
if(!base)
{
message->error = hSession->ssl.error = 0;
message->title = _( "Security error" );
message->text = _( "No LDAP attribute on the URL" );
message->description = _( "The URL argument should be in the format ldap://[HOST]/[DN]?attribute" );
debug("%s",message->text);
errno = EINVAL;
return NULL;
}
*(attrs[0]++) = 0;
port = strchr(url,':');
if(port)
{
*(port++) = 0;
}
debug("host: \"%s\"",url);
debug("port: %d", atoi(port));
debug("Base: \"%s\"",base);
debug("Attr: \"%s\"",attrs[0]);
// ldap_set_option(NULL, LDAP_OPT_PROTOCOL_VERSION, &ldap_proto);
// Do LDAP Query
lib3270_autoptr(LDAP) ld = ldap_init(url, (port && *port ? atoi(port) : LDAP_PORT));
if(!ld)
{
message->error = hSession->ssl.error = 0;
message->title = _( "Security error" );
message->text = _( "Can't initialize LDAP" );
debug("%s",message->text);
message->lasterror = GetLastError();
message->description = NULL;
errno = EINVAL;
return NULL;
}
static const int version = LDAP_VERSION3;
rc = ldap_set_option(ld, LDAP_OPT_PROTOCOL_VERSION, &version);
if(rc != LDAP_SUCCESS)
{
message->error = hSession->ssl.error = 0;
message->title = _( "Security error" );
message->text = _( "Can't set LDAP protocol version" );
message->lasterror = LdapMapErrorToWin32(rc);
message->description = NULL;
debug("%s (rc=%u, lasterror=%d)",ldap_err2string(rc),rc,(unsigned int) message->lasterror);
errno = EINVAL;
return NULL;
}
rc = ldap_simple_bind_s(ld, NULL, NULL);
if(rc != LDAP_SUCCESS)
{
message->error = hSession->ssl.error = 0;
message->title = _( "Security error" );
message->text = _( "Can't bind to LDAP server" );
message->lasterror = LdapMapErrorToWin32(rc);
message->description = NULL;
debug("%s (rc=%u, lasterror=%d)",ldap_err2string(rc),rc,(unsigned int) message->lasterror);
errno = EINVAL;
return NULL;
}
lib3270_autoptr(LDAPMessage) results = NULL;
rc = ldap_search_ext_s(
ld, // Specifies the LDAP pointer returned by a previous call to ldap_init(), ldap_ssl_init(), or ldap_open().
base, // Specifies the DN of the entry at which to start the search.
LDAP_SCOPE_BASE, // Specifies the scope of the search.
NULL, // Specifies a string representation of the filter to apply in the search.
(char **) &attrs, // Specifies a null-terminated array of character string attribute types to return from entries that match filter.
0, // Should be set to 1 to request attribute types only. Set to 0 to request both attributes types and attribute values.
NULL,
NULL,
NULL,
0,
&results
);
if(rc != LDAP_SUCCESS)
{
message->error = hSession->ssl.error = 0;
message->title = _( "Security error" );
message->text = _( "Can't search LDAP server" );
message->description = ldap_err2string(rc);
lib3270_write_log(hSession,"ssl","%s: %s",url, message->description);
return NULL;
}
lib3270_autoptr(BerElement) ber = NULL;
char __attribute__ ((__cleanup__(lib3270_autoptr_cleanup_LDAPPTR))) *attr = ldap_first_attribute(ld, results, &ber);
if(!attr)
{
message->error = hSession->ssl.error = 0;
message->title = _( "Security error" );
message->text = _( "Can't get LDAP attribute" );
message->description = _("Search did not produce any attributes.");
lib3270_write_log(hSession,"ssl","%s: %s",url, message->description);
errno = ENOENT;
return NULL;
}
struct berval ** value = ldap_get_values_len(ld, results, attr);
if(!value)
{
message->error = hSession->ssl.error = 0;
message->title = _( "Security error" );
message->text = _( "Can't get LDAP attribute" );
message->description = _("Search did not produce any values.");
lib3270_write_log(hSession,"ssl","%s: %s",url, message->description);
errno = ENOENT;
return NULL;
}
if(lib3270_get_toggle(hSession,LIB3270_TOGGLE_SSL_TRACE))
{
lib3270_trace_data(
hSession,
"CRL Data received from LDAP server",
(const unsigned char *) value[0]->bv_val,
value[0]->bv_len
);
}
// Precisa salvar uma cópia porque d2i_X509_CRL modifica o ponteiro.
const unsigned char *crl_data = (const unsigned char *) value[0]->bv_val;
if(!d2i_X509_CRL(&x509_crl, &crl_data, value[0]->bv_len))
{
message->error = hSession->ssl.error = ERR_get_error();
message->title = _( "Security error" );
message->text = _( "Can't decode certificate revocation list" );
lib3270_write_log(hSession,"ssl","%s: %s",url, message->text);
ldap_value_free_len(value);
return NULL;
}
ldap_value_free_len(value);
return x509_crl;
}
#endif // defined(HAVE_LIBSSL) && defined(SSL_ENABLE_CRL_CHECK) && defined(HAVE_LDAP)