#include "portable.h"
#include <stdio.h>
#include <ac/stdlib.h>
#include <ac/string.h>
#include "slap.h"
#include <limits.h>
#include <ldap_pvt.h>
#define SASLREGEX_REPLACE 10
typedef struct sasl_regexp {
char *sr_match;
char *sr_replace;
regex_t sr_workspace;
int sr_offset[SASLREGEX_REPLACE+2];
} SaslRegexp_t;
static int nSaslRegexp = 0;
static SaslRegexp_t *SaslRegexp = NULL;
#define SASL_AUTHZ_NONE 0
#define SASL_AUTHZ_FROM 1
#define SASL_AUTHZ_TO 2
static int authz_policy = SASL_AUTHZ_NONE;
int slap_sasl_setpolicy( const char *arg )
{
int rc = LDAP_SUCCESS;
if ( strcasecmp( arg, "none" ) == 0 ) {
authz_policy = SASL_AUTHZ_NONE;
} else if ( strcasecmp( arg, "from" ) == 0 ) {
authz_policy = SASL_AUTHZ_FROM;
} else if ( strcasecmp( arg, "to" ) == 0 ) {
authz_policy = SASL_AUTHZ_TO;
} else if ( strcasecmp( arg, "both" ) == 0 ) {
authz_policy = SASL_AUTHZ_FROM | SASL_AUTHZ_TO;
} else {
rc = LDAP_OTHER;
}
return rc;
}
static int slap_parseURI( struct berval *uri,
struct berval *searchbase, int *scope, Filter **filter )
{
struct berval bv;
int rc;
LDAPURLDesc *ludp;
assert( uri != NULL && uri->bv_val != NULL );
searchbase->bv_val = NULL;
searchbase->bv_len = 0;
*scope = -1;
*filter = NULL;
#ifdef NEW_LOGGING
LDAP_LOG( TRANSPORT, ENTRY,
"slap_parseURI: parsing %s\n", uri->bv_val, 0, 0 );
#else
Debug( LDAP_DEBUG_TRACE, "slap_parseURI: parsing %s\n", uri->bv_val, 0, 0 );
#endif
if( !strncasecmp( uri->bv_val, "dn:", sizeof("dn:")-1 ) ) {
bv.bv_val = uri->bv_val + sizeof("dn:")-1;
bv.bv_val += strspn( bv.bv_val, " " );
is_dn: bv.bv_len = uri->bv_len - (bv.bv_val - uri->bv_val);
rc = dnNormalize2( NULL, &bv, searchbase );
if( rc == LDAP_SUCCESS ) {
*scope = LDAP_SCOPE_BASE;
}
return( rc );
}
rc = ldap_url_parse( uri->bv_val, &ludp );
if ( rc == LDAP_URL_ERR_BADSCHEME ) {
bv.bv_val = uri->bv_val;
goto is_dn;
}
if ( rc != LDAP_URL_SUCCESS ) {
return LDAP_PROTOCOL_ERROR;
}
if (( ludp->lud_host && *ludp->lud_host )
|| ludp->lud_attrs || ludp->lud_exts )
{
return LDAP_PROTOCOL_ERROR;
}
*scope = ludp->lud_scope;
if ( ludp->lud_filter ) {
*filter = str2filter( ludp->lud_filter );
if ( *filter == NULL ) {
rc = LDAP_PROTOCOL_ERROR;
goto done;
}
}
bv.bv_val = ludp->lud_dn;
bv.bv_len = strlen( bv.bv_val );
rc = dnNormalize2( NULL, &bv, searchbase );
done:
if( rc != LDAP_SUCCESS ) {
if( *filter ) filter_free( *filter );
}
ldap_free_urldesc( ludp );
return( rc );
}
static int slap_sasl_rx_off(char *rep, int *off)
{
const char *c;
int n;
off[0] = -2;
n = 1;
for ( c = rep; *c; c++ ) {
if ( *c == '\\' && c[1] ) {
c++;
continue;
}
if ( *c == '$' ) {
if ( n == SASLREGEX_REPLACE ) {
#ifdef NEW_LOGGING
LDAP_LOG( TRANSPORT, ERR,
"slap_sasl_rx_off: \"%s\" has too many $n "
"placeholders (max %d)\n", rep, SASLREGEX_REPLACE, 0 );
#else
Debug( LDAP_DEBUG_ANY,
"SASL replace pattern %s has too many $n "
"placeholders (max %d)\n",
rep, SASLREGEX_REPLACE, 0 );
#endif
return( LDAP_OTHER );
}
off[n] = c - rep;
n++;
}
}
off[n] = c - rep;
n++;
off[n] = -1;
return( LDAP_SUCCESS );
}
int slap_sasl_regexp_config( const char *match, const char *replace )
{
int rc;
SaslRegexp_t *reg;
SaslRegexp = (SaslRegexp_t *) ch_realloc( (char *) SaslRegexp,
(nSaslRegexp + 1) * sizeof(SaslRegexp_t) );
reg = &SaslRegexp[nSaslRegexp];
reg->sr_match = ch_strdup( match );
reg->sr_replace = ch_strdup( replace );
rc = regcomp( ®->sr_workspace, reg->sr_match, REG_EXTENDED|REG_ICASE );
if ( rc ) {
#ifdef NEW_LOGGING
LDAP_LOG( TRANSPORT, ERR,
"slap_sasl_regexp_config: \"%s\" could not be compiled.\n",
reg->sr_match, 0, 0 );
#else
Debug( LDAP_DEBUG_ANY,
"SASL match pattern %s could not be compiled by regexp engine\n",
reg->sr_match, 0, 0 );
#endif
return( LDAP_OTHER );
}
rc = slap_sasl_rx_off( reg->sr_replace, reg->sr_offset );
if ( rc != LDAP_SUCCESS ) return rc;
nSaslRegexp++;
return( LDAP_SUCCESS );
}
static void slap_sasl_rx_exp(
const char *rep,
const int *off,
regmatch_t *str,
const char *saslname,
struct berval *out )
{
int i, n, len, insert;
n=1;
len = 0;
while( off[n] >= 0 ) {
len += off[n] - off[n-1] - 2;
if( off[n+1] < 0)
break;
i = rep[ off[n] + 1 ] - '0';
len += str[i].rm_eo - str[i].rm_so;
n++;
}
out->bv_val = ch_malloc( len + 1 );
out->bv_len = len;
n=1;
insert = 0;
while( off[n] >= 0) {
len = off[n] - off[n-1] - 2;
strncpy( out->bv_val+insert, rep + off[n-1] + 2, len);
insert += len;
if( off[n+1] < 0)
break;
i = rep[ off[n] + 1 ] - '0';
len = str[i].rm_eo - str[i].rm_so;
strncpy( out->bv_val+insert, saslname + str[i].rm_so, len );
insert += len;
n++;
}
out->bv_val[insert] = '\0';
}
static int slap_sasl_regexp( struct berval *in, struct berval *out )
{
char *saslname = in->bv_val;
SaslRegexp_t *reg;
regmatch_t sr_strings[SASLREGEX_REPLACE];
int i;
memset( out, 0, sizeof( *out ) );
#ifdef NEW_LOGGING
LDAP_LOG( TRANSPORT, ENTRY,
"slap_sasl_regexp: converting SASL name %s\n", saslname, 0, 0 );
#else
Debug( LDAP_DEBUG_TRACE, "slap_sasl_regexp: converting SASL name %s\n",
saslname, 0, 0 );
#endif
if (( saslname == NULL ) || ( nSaslRegexp == 0 )) {
return( 0 );
}
for( reg = SaslRegexp,i=0; i<nSaslRegexp; i++,reg++ ) {
if ( regexec( ®->sr_workspace, saslname, SASLREGEX_REPLACE,
sr_strings, 0) == 0 )
break;
}
if( i >= nSaslRegexp ) return( 0 );
slap_sasl_rx_exp( reg->sr_replace, reg->sr_offset,
sr_strings, saslname, out );
#ifdef NEW_LOGGING
LDAP_LOG( TRANSPORT, ENTRY,
"slap_sasl_regexp: converted SASL name to %s\n",
out->bv_len ? out->bv_val : "", 0, 0 );
#else
Debug( LDAP_DEBUG_TRACE,
"slap_sasl_regexp: converted SASL name to %s\n",
out->bv_len ? out->bv_val : "", 0, 0 );
#endif
return( 1 );
}
void slap_cb_null_response( Connection *conn, Operation *o, ber_tag_t tag,
ber_int_t msgid, ber_int_t err, const char *matched,
const char *text, BerVarray ref, const char *resoid,
struct berval *resdata, struct berval *sasldata, LDAPControl **c)
{
}
void slap_cb_null_sresult( Connection *conn, Operation *o, ber_int_t err,
const char *matched, const char *text, BerVarray refs, LDAPControl **c,
int nentries)
{
}
int slap_cb_null_sreference( BackendDB *db, Connection *conn, Operation *o,
Entry *e, BerVarray r, LDAPControl **c, BerVarray *v2)
{
return 0;
}
static int sasl_sc_sasl2dn( BackendDB *be, Connection *conn, Operation *o,
Entry *e, AttributeName *an, int ao, LDAPControl **c)
{
struct berval *ndn = o->o_callback->sc_private;
if( ndn->bv_val ) {
free(ndn->bv_val);
ndn->bv_val = NULL;
#ifdef NEW_LOGGING
LDAP_LOG( TRANSPORT, DETAIL1,
"slap_sasl2dn: search DN returned more than 1 entry\n", 0, 0, 0 );
#else
Debug( LDAP_DEBUG_TRACE,
"slap_sasl2dn: search DN returned more than 1 entry\n", 0,0,0 );
#endif
return -1;
}
ber_dupbv(ndn, &e->e_nname);
return 0;
}
typedef struct smatch_info {
struct berval *dn;
int match;
} smatch_info;
static int sasl_sc_smatch( BackendDB *be, Connection *conn, Operation *o,
Entry *e, AttributeName *an, int ao, LDAPControl **c)
{
smatch_info *sm = o->o_callback->sc_private;
if (dn_match(sm->dn, &e->e_nname)) {
sm->match = 1;
return -1;
}
return 1;
}
static
int slap_sasl_match(Connection *conn, struct berval *rule, struct berval *assertDN, struct berval *authc )
{
struct berval searchbase = {0, NULL};
int rc, scope;
Backend *be;
Filter *filter=NULL;
regex_t reg;
smatch_info sm;
slap_callback cb = {
slap_cb_null_response,
slap_cb_null_sresult,
sasl_sc_smatch,
NULL
};
Operation op = {0};
#ifdef NEW_LOGGING
LDAP_LOG( TRANSPORT, ENTRY,
"slap_sasl_match: comparing DN %s to rule %s\n",
assertDN->bv_val, rule->bv_val,0 );
#else
Debug( LDAP_DEBUG_TRACE,
"===>slap_sasl_match: comparing DN %s to rule %s\n",
assertDN->bv_val, rule->bv_val, 0 );
#endif
rc = slap_parseURI( rule, &searchbase, &scope, &filter );
if( rc != LDAP_SUCCESS ) goto CONCLUDED;
if( scope == LDAP_SCOPE_BASE ) {
rc = regcomp(®, searchbase.bv_val,
REG_EXTENDED|REG_ICASE|REG_NOSUB);
if ( rc == 0 ) {
rc = regexec(®, assertDN->bv_val, 0, NULL, 0);
regfree( ® );
}
if ( rc == 0 ) {
rc = LDAP_SUCCESS;
} else {
rc = LDAP_INAPPROPRIATE_AUTH;
}
goto CONCLUDED;
}
#ifdef NEW_LOGGING
LDAP_LOG( TRANSPORT, DETAIL1,
"slap_sasl_match: performing internal search (base=%s, scope=%d)\n",
searchbase.bv_val, scope,0 );
#else
Debug( LDAP_DEBUG_TRACE,
"slap_sasl_match: performing internal search (base=%s, scope=%d)\n",
searchbase.bv_val, scope, 0 );
#endif
be = select_backend( &searchbase, 0, 1 );
if(( be == NULL ) || ( be->be_search == NULL)) {
rc = LDAP_INAPPROPRIATE_AUTH;
goto CONCLUDED;
}
sm.dn = assertDN;
sm.match = 0;
cb.sc_private = &sm;
op.o_tag = LDAP_REQ_SEARCH;
op.o_protocol = LDAP_VERSION3;
op.o_ndn = *authc;
op.o_callback = &cb;
op.o_time = slap_get_time();
op.o_do_not_cache = 1;
op.o_is_auth_check = 1;
op.o_threadctx = conn->c_sasl_bindop->o_threadctx;
(*be->be_search)( be, conn, &op, NULL, &searchbase,
scope, 1, 0, 0, filter, NULL,
NULL, 0 );
if (sm.match) {
rc = LDAP_SUCCESS;
} else {
rc = LDAP_INAPPROPRIATE_AUTH;
}
CONCLUDED:
if( searchbase.bv_len ) ch_free( searchbase.bv_val );
if( filter ) filter_free( filter );
#ifdef NEW_LOGGING
LDAP_LOG( TRANSPORT, ENTRY,
"slap_sasl_match: comparison returned %d\n", rc, 0, 0 );
#else
Debug( LDAP_DEBUG_TRACE,
"<===slap_sasl_match: comparison returned %d\n", rc, 0, 0);
#endif
return( rc );
}
static int
slap_sasl_check_authz( Connection *conn,
struct berval *searchDN,
struct berval *assertDN,
AttributeDescription *ad,
struct berval *authc )
{
int i, rc;
BerVarray vals=NULL;
#ifdef NEW_LOGGING
LDAP_LOG( TRANSPORT, ENTRY,
"slap_sasl_check_authz: does %s match %s rule in %s?\n",
assertDN->bv_val, ad->ad_cname.bv_val, searchDN->bv_val);
#else
Debug( LDAP_DEBUG_TRACE,
"==>slap_sasl_check_authz: does %s match %s rule in %s?\n",
assertDN->bv_val, ad->ad_cname.bv_val, searchDN->bv_val);
#endif
rc = backend_attribute( NULL, NULL, conn->c_sasl_bindop, NULL,
searchDN, ad, &vals );
if( rc != LDAP_SUCCESS ) goto COMPLETE;
for( i=0; vals[i].bv_val != NULL; i++ ) {
rc = slap_sasl_match( conn, &vals[i], assertDN, authc );
if ( rc == LDAP_SUCCESS ) goto COMPLETE;
}
rc = LDAP_INAPPROPRIATE_AUTH;
COMPLETE:
if( vals ) ber_bvarray_free( vals );
#ifdef NEW_LOGGING
LDAP_LOG( TRANSPORT, RESULTS,
"slap_sasl_check_authz: %s check returning %s\n",
ad->ad_cname.bv_val, rc, 0 );
#else
Debug( LDAP_DEBUG_TRACE,
"<==slap_sasl_check_authz: %s check returning %d\n",
ad->ad_cname.bv_val, rc, 0);
#endif
return( rc );
}
void slap_sasl2dn( Connection *conn,
struct berval *saslname, struct berval *sasldn )
{
int rc;
Backend *be = NULL;
struct berval dn = { 0, NULL };
int scope = LDAP_SCOPE_BASE;
Filter *filter = NULL;
slap_callback cb = { slap_cb_null_response,
slap_cb_null_sresult, sasl_sc_sasl2dn, slap_cb_null_sreference, NULL};
Operation op = {0};
struct berval regout = { 0, NULL };
#ifdef NEW_LOGGING
LDAP_LOG( TRANSPORT, ENTRY,
"slap_sasl2dn: converting SASL name %s to DN.\n",
saslname->bv_val, 0, 0 );
#else
Debug( LDAP_DEBUG_TRACE, "==>slap_sasl2dn: "
"converting SASL name %s to a DN\n",
saslname->bv_val, 0,0 );
#endif
sasldn->bv_val = NULL;
sasldn->bv_len = 0;
cb.sc_private = sasldn;
if( !slap_sasl_regexp( saslname, ®out ) ) {
goto FINISHED;
}
rc = slap_parseURI( ®out, &dn, &scope, &filter );
if( regout.bv_val ) ch_free( regout.bv_val );
if( rc != LDAP_SUCCESS ) {
goto FINISHED;
}
be = select_backend( &dn, 0, 1 );
if( scope == LDAP_SCOPE_BASE ) {
*sasldn = dn;
dn.bv_len = 0;
dn.bv_val = NULL;
goto FINISHED;
}
#ifdef NEW_LOGGING
LDAP_LOG( TRANSPORT, DETAIL1,
"slap_sasl2dn: performing internal search (base=%s, scope=%d)\n",
dn.bv_val, scope, 0 );
#else
Debug( LDAP_DEBUG_TRACE,
"slap_sasl2dn: performing internal search (base=%s, scope=%d)\n",
dn.bv_val, scope, 0 );
#endif
if(( be == NULL ) || ( be->be_search == NULL)) {
goto FINISHED;
}
op.o_tag = LDAP_REQ_SEARCH;
op.o_protocol = LDAP_VERSION3;
op.o_ndn = conn->c_ndn;
op.o_callback = &cb;
op.o_time = slap_get_time();
op.o_do_not_cache = 1;
op.o_is_auth_check = 1;
op.o_threadctx = conn->c_sasl_bindop->o_threadctx;
(*be->be_search)( be, conn, &op, NULL, &dn,
scope, LDAP_DEREF_NEVER, 1, 0,
filter, NULL, NULL, 1 );
FINISHED:
if( sasldn->bv_len ) {
conn->c_authz_backend = be;
}
if( dn.bv_len ) ch_free( dn.bv_val );
if( filter ) filter_free( filter );
#ifdef NEW_LOGGING
LDAP_LOG( TRANSPORT, ENTRY,
"slap_sasl2dn: Converted SASL name to %s\n",
sasldn->bv_len ? sasldn->bv_val : "<nothing>", 0, 0 );
#else
Debug( LDAP_DEBUG_TRACE, "<==slap_sasl2dn: Converted SASL name to %s\n",
sasldn->bv_len ? sasldn->bv_val : "<nothing>", 0, 0 );
#endif
return;
}
int slap_sasl_authorized( Connection *conn,
struct berval *authcDN, struct berval *authzDN )
{
int rc = LDAP_INAPPROPRIATE_AUTH;
if ( authzDN == NULL ) {
rc = LDAP_SUCCESS;
goto DONE;
}
#ifdef NEW_LOGGING
LDAP_LOG( TRANSPORT, ENTRY,
"slap_sasl_authorized: can %s become %s?\n",
authcDN->bv_val, authzDN->bv_val, 0 );
#else
Debug( LDAP_DEBUG_TRACE,
"==>slap_sasl_authorized: can %s become %s?\n",
authcDN->bv_val, authzDN->bv_val, 0 );
#endif
if ( dn_match( authcDN, authzDN ) ) {
rc = LDAP_SUCCESS;
goto DONE;
}
if( conn->c_authz_backend && be_isroot( conn->c_authz_backend, authcDN )) {
rc = LDAP_SUCCESS;
goto DONE;
}
if( authz_policy & SASL_AUTHZ_TO ) {
rc = slap_sasl_check_authz( conn, authcDN, authzDN,
slap_schema.si_ad_saslAuthzTo, authcDN );
if( rc == LDAP_SUCCESS ) {
goto DONE;
}
}
if( authz_policy & SASL_AUTHZ_FROM ) {
rc = slap_sasl_check_authz( conn, authzDN, authcDN,
slap_schema.si_ad_saslAuthzFrom, authcDN );
if( rc == LDAP_SUCCESS ) {
goto DONE;
}
}
rc = LDAP_INAPPROPRIATE_AUTH;
DONE:
#ifdef NEW_LOGGING
LDAP_LOG( TRANSPORT, RESULTS, "slap_sasl_authorized: return %d\n", rc,0,0 );
#else
Debug( LDAP_DEBUG_TRACE,
"<== slap_sasl_authorized: return %d\n", rc, 0, 0 );
#endif
return( rc );
}