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openldap/servers/slapd/sasl.c
Gary Williams ffcdc6d11d More new logging (Behind NEW_LOGGING)
2001-01-15 19:17:29 +00:00

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/* $OpenLDAP$ */
/*
* Copyright 1998-2000 The OpenLDAP Foundation, All Rights Reserved.
* COPYING RESTRICTIONS APPLY, see COPYRIGHT file
*/
#include "portable.h"
#include <ac/stdlib.h>
#include <stdio.h>
#include "slap.h"
#include "proto-slap.h"
#include <lber.h>
#include <ldap_log.h>
#ifdef HAVE_CYRUS_SASL
#include <limits.h>
#include <sasl.h>
#include <ldap_pvt.h>
#ifdef SLAPD_SPASSWD
#include <lutil.h>
#endif
static sasl_security_properties_t sasl_secprops;
static int
slap_sasl_log(
void *context,
int priority,
const char *message)
{
Connection *conn = context;
int level;
const char * label;
if ( message == NULL ) {
return SASL_BADPARAM;
}
switch (priority) {
case SASL_LOG_ERR:
level = LDAP_DEBUG_ANY;
label = "Error";
break;
case SASL_LOG_WARNING:
level = LDAP_DEBUG_TRACE;
label = "Warning";
break;
case SASL_LOG_INFO:
level = LDAP_DEBUG_TRACE;
label = "Info";
break;
default:
return SASL_BADPARAM;
}
#ifdef NEW_LOGGING
LDAP_LOG(( "sasl", LDAP_LEVEL_ENTRY,
"SASL [conn=%d] %s: %s\n",
conn ? conn->c_connid : -1,
label, message ));
#else
Debug( level, "SASL [conn=%d] %s: %s\n",
conn ? conn->c_connid: -1,
label, message );
#endif
return SASL_OK;
}
/* Take any sort of identity string and return a DN with the "dn:" prefix. The
string returned in *dnptr is in its own allocated memory, and must be free'd
by the calling process.
-Mark Adamson, Carnegie Mellon
*/
int slap_sasl_getdn( Connection *conn, char *id, char **dnptr, int flags )
{
char *c, *c1, *dn=NULL;
int rc, len, len1;
sasl_conn_t *ctx;
#ifdef NEW_LOGGING
LDAP_LOG(( "sasl", LDAP_LEVEL_ENTRY,
"slap_sasl_getdn: conn %d id=%s\n",
conn ? conn->c_connid : -1,
id ? (*id ? id : "<empty>") : "NULL" ));
#else
Debug( LDAP_DEBUG_ARGS, "slap_sasl_getdn: id=%s\n",
id?(*id?id:"<empty>"):"NULL",0,0 );
#endif
/* Blatantly anonymous ID */
len = strlen( "anonymous" );
if( id && !strncasecmp( id, "anonymous", len) &&
( id[len] == '\0' || id[len] == '@' ) ) {
*dnptr = NULL;
return( LDAP_SUCCESS );
}
ctx = conn->c_sasl_context;
dn = ch_strdup( id );
len = strlen( id );
/* An authcID will need to be prefixed with u: */
if( flags & FLAG_GETDN_AUTHCID ) {
dn = ch_realloc( dn, len+3 );
memmove( dn+2, dn, len+1 );
dn[0] = 'u';
dn[1] = ':';
len += 2;
}
/* An authzID must be properly prefixed */
if( flags & FLAG_GETDN_AUTHZID && strncasecmp( dn, "u:", 2 ) &&
strncasecmp( dn, "dn:", 3 ) ) {
ch_free( dn );
*dnptr = NULL;
return( LDAP_INAPPROPRIATE_AUTH );
}
/* Username strings */
len1 = strlen( ",cn=authzid" );
if( !strncasecmp( dn, "u:", 2 ) ) {
len += strlen( "dn:uid=" ) + len1;
/* Figure out how much data we have for the dn */
rc = sasl_getprop( ctx, SASL_REALM, (void **)&c );
if( rc != SASL_OK ) {
#ifdef NEW_LOGGING
LDAP_LOG(( "sasl", LDAP_LEVEL_ERR,
"slap_sasl_getdn: getprop(REALM) failed.\n" ));
#else
Debug(LDAP_DEBUG_TRACE,
"getdn: getprop(REALM) failed!\n", 0,0,0);
#endif
ch_free( dn );
*dnptr = NULL;
return( LDAP_OPERATIONS_ERROR );
}
if( c ) {
len += strlen( c ) + strlen(",cn=" );
}
if( conn->c_sasl_bind_mech ) {
len += strlen( conn->c_sasl_bind_mech ) + strlen( ",cn=mech" );
}
/* Build the new dn */
c1 = dn;
dn = ch_malloc( len );
len = sprintf( dn, "dn:uid=%s", c1+2 );
ch_free( c1 );
if( c ) {
len += sprintf( dn+len, ",cn=%s", c );
}
if( conn->c_sasl_bind_mech ) {
len += sprintf( dn+len, ",cn=%s", conn->c_sasl_bind_mech );
}
strcpy( dn+len, ",cn=authzid" );
len += len1;
#ifdef NEW_LOGGING
LDAP_LOG(( "sasl", LDAP_LEVEL_ENTRY,
"getdn: u:id converted to %s.\n", dn ));
#else
Debug( LDAP_DEBUG_TRACE, "getdn: u:id converted to %s\n", dn,0,0 );
#endif
}
/* DN strings that are a cn=authzid identity to run through regexp */
if( !strncasecmp( dn, "dn:", 3) && ( ( flags & FLAG_GETDN_FINAL ) == 0 ) ) {
c1 = slap_sasl2dn( dn + 3 );
if( c1 ) {
ch_free( dn );
dn = c1;
/* Reaffix the dn: prefix if it was removed */
if( strncasecmp( dn, "dn:", 3) ) {
c1 = dn;
dn = ch_malloc( strlen( c1 ) + 4 );
sprintf( dn, "dn:%s", c1 );
ch_free( c1 );
}
#ifdef NEW_LOGGING
LDAP_LOG(( "sasl", LDAP_LEVEL_ENTRY,
"slap_sasl_getdn: dn:id converted to %s.\n", dn ));
#else
Debug( LDAP_DEBUG_TRACE, "getdn: dn:id converted to %s\n", dn,0,0 );
#endif
}
}
if( ( flags & FLAG_GETDN_FINAL ) == 0 ) {
dn_normalize( dn );
}
*dnptr = dn;
return( LDAP_SUCCESS );
}
static int
slap_sasl_authorize(
void *context,
const char *authcid,
const char *authzid,
const char **user,
const char **errstr)
{
char *authcDN, *authzDN;
int rc;
Connection *conn = context;
*user = NULL;
#ifdef NEW_LOGGING
LDAP_LOG(( "sasl", LDAP_LEVEL_ENTRY,
"slap_sas_authorize: conn %d authcid=\"%s\" authzid=\"%s\"\n",
conn ? conn->c_connid : -1,
authcid ? authcid : "<empty>",
authzid ? authzid : "<empty>" ));
#else
Debug( LDAP_DEBUG_ARGS, "SASL Authorize [conn=%ld]: "
"authcid=\"%s\" authzid=\"%s\"\n",
(long) (conn ? conn->c_connid : -1),
authcid ? authcid : "<empty>",
authzid ? authzid : "<empty>" );
#endif
/* Convert the identities to DN's. If no authzid was given, client will
be bound as the DN matching their username */
rc = slap_sasl_getdn( conn, (char *)authcid, &authcDN, FLAG_GETDN_AUTHCID );
if( rc != LDAP_SUCCESS ) {
*errstr = ldap_err2string( rc );
return SASL_NOAUTHZ;
}
if( ( authzid == NULL ) || !strcmp( authcid,authzid ) ) {
#ifdef NEW_LOGGING
LDAP_LOG(( "sasl", LDAP_LEVEL_ENTRY,
"slap_sasl_authorize: conn %d Using authcDN=%s\n",
conn ? conn->c_connid : -1, authcDN ));
#else
Debug( LDAP_DEBUG_TRACE, "SASL Authorize [conn=%ld]: "
"Using authcDN=%s\n", (long) (conn ? conn->c_connid : -1), authcDN,0 );
#endif
*user = authcDN;
*errstr = NULL;
return SASL_OK;
}
rc = slap_sasl_getdn( conn, (char *)authzid, &authzDN, FLAG_GETDN_AUTHZID );
if( rc != LDAP_SUCCESS ) {
ch_free( authcDN );
*errstr = ldap_err2string( rc );
return SASL_NOAUTHZ;
}
rc = slap_sasl_authorized( authcDN, authzDN );
if( rc ) {
#ifdef NEW_LOGGING
LDAP_LOG(( "sasl", LDAP_LEVEL_INFO,
"slap_sasl_authorize: conn %ld authorization disallowed (%d)\n",
(long)(conn ? conn->c_connid : -1), rc ));
#else
Debug( LDAP_DEBUG_TRACE, "SASL Authorize [conn=%ld]: "
" authorization disallowed (%d)\n",
(long) (conn ? conn->c_connid : -1), rc, 0 );
#endif
*errstr = "not authorized";
ch_free( authcDN );
ch_free( authzDN );
return SASL_NOAUTHZ;
}
#ifdef NEW_LOGGING
LDAP_LOG(( "sasl", LDAP_LEVEL_ENTRY,
"slap_sasl_authorize: conn %d authorization allowed\n",
(long)(conn ? conn->c_connid : -1 ) );
#else
Debug( LDAP_DEBUG_TRACE, "SASL Authorize [conn=%ld]: "
" authorization allowed\n",
(long) (conn ? conn->c_connid : -1), 0, 0 );
#endif
ch_free( authcDN );
*user = authzDN;
*errstr = NULL;
return SASL_OK;
}
static int
slap_sasl_err2ldap( int saslerr )
{
int rc;
switch (saslerr) {
case SASL_CONTINUE:
rc = LDAP_SASL_BIND_IN_PROGRESS;
break;
case SASL_FAIL:
rc = LDAP_OTHER;
break;
case SASL_NOMEM:
rc = LDAP_OTHER;
break;
case SASL_NOMECH:
rc = LDAP_AUTH_METHOD_NOT_SUPPORTED;
break;
case SASL_BADAUTH:
rc = LDAP_INVALID_CREDENTIALS;
break;
case SASL_NOAUTHZ:
rc = LDAP_INSUFFICIENT_ACCESS;
break;
case SASL_TOOWEAK:
case SASL_ENCRYPT:
rc = LDAP_INAPPROPRIATE_AUTH;
break;
default:
rc = LDAP_OTHER;
break;
}
return rc;
}
#endif
int slap_sasl_init( void )
{
#ifdef HAVE_CYRUS_SASL
int rc;
static sasl_callback_t server_callbacks[] = {
{ SASL_CB_LOG, &slap_sasl_log, NULL },
{ SASL_CB_LIST_END, NULL, NULL }
};
sasl_set_alloc(
ch_malloc,
ch_calloc,
ch_realloc,
ch_free );
sasl_set_mutex(
ldap_pvt_sasl_mutex_new,
ldap_pvt_sasl_mutex_lock,
ldap_pvt_sasl_mutex_unlock,
ldap_pvt_sasl_mutex_dispose );
/* should provide callbacks for logging */
/* server name should be configurable */
rc = sasl_server_init( server_callbacks, "slapd" );
if( rc != SASL_OK ) {
#ifdef NEW_LOGGING
LDAP_LOG(( "sasl", LDAP_LEVEL_INFO,
"slap_sasl_init: init failed.\n" ));
#else
Debug( LDAP_DEBUG_ANY, "sasl_server_init failed\n",
0, 0, 0 );
#endif
return -1;
}
#ifdef NEW_LOGGING
LDAP_LOG(( "sasl", LDAP_LEVEL_INFO,
"slap_sasl_init: initialized!\n"));
#else
Debug( LDAP_DEBUG_TRACE, "slap_sasl_init: initialized!\n",
0, 0, 0 );
#endif
/* default security properties */
memset( &sasl_secprops, '\0', sizeof(sasl_secprops) );
sasl_secprops.max_ssf = INT_MAX;
sasl_secprops.maxbufsize = 65536;
sasl_secprops.security_flags = SASL_SEC_NOPLAINTEXT|SASL_SEC_NOANONYMOUS;
#endif
return 0;
}
int slap_sasl_destroy( void )
{
#ifdef HAVE_CYRUS_SASL
sasl_done();
#endif
return 0;
}
int slap_sasl_open( Connection *conn )
{
int sc = LDAP_SUCCESS;
#ifdef HAVE_CYRUS_SASL
sasl_conn_t *ctx = NULL;
sasl_callback_t *session_callbacks;
assert( conn->c_sasl_context == NULL );
assert( conn->c_sasl_extra == NULL );
conn->c_sasl_layers = 0;
session_callbacks =
ch_calloc( 3, sizeof(sasl_callback_t));
conn->c_sasl_extra = session_callbacks;
session_callbacks[0].id = SASL_CB_LOG;
session_callbacks[0].proc = &slap_sasl_log;
session_callbacks[0].context = conn;
session_callbacks[1].id = SASL_CB_PROXY_POLICY;
session_callbacks[1].proc = &slap_sasl_authorize;
session_callbacks[1].context = conn;
session_callbacks[2].id = SASL_CB_LIST_END;
session_callbacks[2].proc = NULL;
session_callbacks[2].context = NULL;
if( global_host == NULL ) {
global_host = ldap_pvt_get_fqdn( NULL );
}
/* create new SASL context */
sc = sasl_server_new( "ldap", global_host, global_realm,
session_callbacks, SASL_SECURITY_LAYER, &ctx );
if( sc != SASL_OK ) {
#ifdef NEW_LOGGING
LDAP_LOG(( "sasl", LDAP_LEVEL_ERR,
"slap_sasl_open: sasl_server_new failed: %d\n", sc ));
#else
Debug( LDAP_DEBUG_ANY, "sasl_server_new failed: %d\n",
sc, 0, 0 );
#endif
return -1;
}
conn->c_sasl_context = ctx;
if( sc == SASL_OK ) {
sc = sasl_setprop( ctx,
SASL_SEC_PROPS, &sasl_secprops );
if( sc != SASL_OK ) {
#ifdef NEW_LOGGING
LDAP_LOG(( "sasl", LDAP_LEVEL_ERR,
"slap_sasl_open: sasl_setprop failed: %d \n", sc ));
#else
Debug( LDAP_DEBUG_ANY, "sasl_setprop failed: %d\n",
sc, 0, 0 );
#endif
slap_sasl_close( conn );
return -1;
}
}
sc = slap_sasl_err2ldap( sc );
#endif
return sc;
}
int slap_sasl_external(
Connection *conn,
slap_ssf_t ssf,
const char *auth_id )
{
#ifdef HAVE_CYRUS_SASL
int sc;
sasl_conn_t *ctx = conn->c_sasl_context;
sasl_external_properties_t extprops;
if ( ctx == NULL ) {
return LDAP_UNAVAILABLE;
}
memset( &extprops, '\0', sizeof(extprops) );
extprops.ssf = ssf;
extprops.auth_id = (char *) auth_id;
sc = sasl_setprop( ctx, SASL_SSF_EXTERNAL,
(void *) &extprops );
if ( sc != SASL_OK ) {
return LDAP_OTHER;
}
#endif
return LDAP_SUCCESS;
}
int slap_sasl_reset( Connection *conn )
{
#ifdef HAVE_CYRUS_SASL
sasl_conn_t *ctx = conn->c_sasl_context;
if( ctx != NULL ) {
}
#endif
/* must return "anonymous" */
return LDAP_SUCCESS;
}
char ** slap_sasl_mechs( Connection *conn )
{
char **mechs = NULL;
#ifdef HAVE_CYRUS_SASL
sasl_conn_t *ctx = conn->c_sasl_context;
if( ctx != NULL ) {
int sc;
char *mechstr;
sc = sasl_listmech( ctx,
NULL, NULL, ",", NULL,
&mechstr, NULL, NULL );
if( sc != SASL_OK ) {
#ifdef NEW_LOGGING
LDAP_LOG(( "sasl", LDAP_LEVEL_ERR,
"slap_sasl_mechs: sasl_listmech failed: %d\n", sc ));
#else
Debug( LDAP_DEBUG_ANY, "slap_sasl_listmech failed: %d\n",
sc, 0, 0 );
#endif
return NULL;
}
mechs = str2charray( mechstr, "," );
ch_free( mechstr );
}
#endif
return mechs;
}
int slap_sasl_close( Connection *conn )
{
#ifdef HAVE_CYRUS_SASL
sasl_conn_t *ctx = conn->c_sasl_context;
if( ctx != NULL ) {
sasl_dispose( &ctx );
}
conn->c_sasl_context = NULL;
free( conn->c_sasl_extra );
conn->c_sasl_extra = NULL;
#endif
return LDAP_SUCCESS;
}
int slap_sasl_bind(
Connection *conn,
Operation *op,
const char *dn,
const char *ndn,
struct berval *cred,
char **edn,
slap_ssf_t *ssfp )
{
int rc = 1;
#ifdef HAVE_CYRUS_SASL
sasl_conn_t *ctx = conn->c_sasl_context;
struct berval response;
unsigned reslen;
const char *errstr;
int sc;
#ifdef NEW_LOGGING
LDAP_LOG(( "sasl", LDAP_LEVEL_ENTRY,
"sasl_bind: conn %ld dn=\"%s\" mech=%s datalen=%d\n",
conn->c_connid, dn,
conn->c_sasl_bind_in_progress ? "<continuing>" : conn->c_sasl_bind_mech,
cred ? cred->bv_len : 0 ));
#else
Debug(LDAP_DEBUG_ARGS,
"==> sasl_bind: dn=\"%s\" mech=%s datalen=%d\n", dn,
conn->c_sasl_bind_in_progress ? "<continuing>":conn->c_sasl_bind_mech,
cred ? cred->bv_len : 0 );
#endif
if( ctx == NULL ) {
send_ldap_result( conn, op, LDAP_UNAVAILABLE,
NULL, "SASL unavailable on this session", NULL, NULL );
return rc;
}
if ( !conn->c_sasl_bind_in_progress ) {
sc = sasl_server_start( ctx,
conn->c_sasl_bind_mech,
cred->bv_val, cred->bv_len,
(char **)&response.bv_val, &reslen, &errstr );
} else {
sc = sasl_server_step( ctx,
cred->bv_val, cred->bv_len,
(char **)&response.bv_val, &reslen, &errstr );
}
response.bv_len = reslen;
if ( sc == SASL_OK ) {
char *username = NULL;
sc = sasl_getprop( ctx,
SASL_USERNAME, (void **)&username );
if ( sc != SASL_OK ) {
#ifdef NEW_LOGGING
LDAP_LOG(( "sasl", LDAP_LEVEL_ERR,
"slap_sasl_bind: getprop(USERNAME) failed: %d\n", sc ));
#else
Debug(LDAP_DEBUG_TRACE,
"slap_sasl_bind: getprop(USERNAME) failed!\n",
0, 0, 0);
#endif
send_ldap_result( conn, op, rc = slap_sasl_err2ldap( sc ),
NULL, "no SASL username", NULL, NULL );
} else {
rc = slap_sasl_getdn( conn, username, edn, FLAG_GETDN_FINAL );
if( rc == LDAP_SUCCESS ) {
int i;
sasl_ssf_t *ssf = NULL;
(void) sasl_getprop( ctx, SASL_SSF, (void *)&ssf );
*ssfp = ssf ? *ssf : 0;
if( *ssfp ) {
ldap_pvt_thread_mutex_lock( &conn->c_mutex );
conn->c_sasl_layers++;
ldap_pvt_thread_mutex_unlock( &conn->c_mutex );
}
/* Store the authorization DN as a subjectDN */
if ( *edn ) {
i = 2;
do {
i++;
(*edn)[i-3] = (*edn)[i];
} while( (*edn)[i] );
}
send_ldap_sasl( conn, op, rc,
NULL, NULL, NULL, NULL,
response.bv_len ? &response : NULL );
} else {
send_ldap_result( conn, op, rc,
NULL, errstr, NULL, NULL );
}
}
} else if ( sc == SASL_CONTINUE ) {
send_ldap_sasl( conn, op, rc = LDAP_SASL_BIND_IN_PROGRESS,
NULL, NULL, NULL, NULL, &response );
} else {
send_ldap_result( conn, op, rc = slap_sasl_err2ldap( sc ),
NULL, errstr, NULL, NULL );
}
#ifdef NEW_LOGGING
LDAP_LOG(( "sasl", LDAP_LEVEL_ENTRY,
"slap_sasl_bind: rc=%d\n", rc ));
#else
Debug(LDAP_DEBUG_TRACE, "<== slap_sasl_bind: rc=%d\n", rc, 0, 0);
#endif
#else
send_ldap_result( conn, op, rc = LDAP_UNAVAILABLE,
NULL, "SASL not supported", NULL, NULL );
#endif
return rc;
}
char* slap_sasl_secprops( const char *in )
{
#ifdef HAVE_CYRUS_SASL
int rc = ldap_pvt_sasl_secprops( in, &sasl_secprops );
return rc == LDAP_SUCCESS ? NULL : "Invalid security properties";
#else
return "SASL not supported";
#endif
}
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