mirror of
https://git.openldap.org/openldap/openldap.git
synced 2024-12-21 03:10:25 +08:00
650 lines
16 KiB
C
650 lines
16 KiB
C
/*
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* Copyright (c) 2000, Mark Adamson, Carnegie Mellon. All rights reserved.
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* This software is not subject to any license of Carnegie Mellon University.
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*
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* Redistribution and use in source and binary forms are permitted without
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* restriction or fee of any kind as long as this notice is preserved.
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*
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* The name "Carnegie Mellon" must not be used to endorse or promote
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* products derived from this software without prior written permission.
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*
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*/
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#include "portable.h"
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#include <ac/stdlib.h>
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#include <stdio.h>
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#include "slap.h"
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#include "proto-slap.h"
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#include <ac/string.h>
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#ifdef HAVE_CYRUS_SASL
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#include <limits.h>
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#include <sasl.h>
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#include <ldap_pvt.h>
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#endif
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/* URI format: ldap://<host>/<base>[?[<attrs>][?[<scope>][?[<filter>]]]] */
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int slap_parseURI( char *uri, char **searchbase, int *scope, Filter **filter )
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{
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char *start, *end;
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assert( uri != NULL );
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*searchbase = NULL;
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*scope = -1;
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*filter = NULL;
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#ifdef NEW_LOGGING
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LDAP_LOG(( "sasl", LDAP_LEVEL_ENTRY,
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"slap_parseURI: parsing %s\n", uri ));
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#else
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Debug( LDAP_DEBUG_TRACE, "slap_parseURI: parsing %s\n", uri, 0, 0 );
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#endif
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/* If it does not look like a URI, assume it is a DN */
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if( !strncasecmp( uri, "dn:", 3 ) ) {
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uri += 3;
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uri += strspn( uri, " " );
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*searchbase = ch_strdup( uri );
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dn_normalize( *searchbase );
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*scope = LDAP_SCOPE_BASE;
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return( LDAP_SUCCESS );
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}
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if( strncasecmp( uri, "ldap://", 7 ) ) {
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*searchbase = ch_strdup( uri );
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dn_normalize( *searchbase );
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*scope = LDAP_SCOPE_BASE;
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return( LDAP_SUCCESS );
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}
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end = strchr( uri + 7, '/' );
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if ( end == NULL )
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return( LDAP_PROTOCOL_ERROR );
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/* could check the hostname here */
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/* Grab the searchbase */
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start = end+1;
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end = strchr( start, '?' );
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if( end == NULL ) {
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*searchbase = ch_strdup( start );
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dn_normalize( *searchbase );
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return( LDAP_SUCCESS );
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}
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*end = '\0';
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*searchbase = ch_strdup( start );
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*end = '?';
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dn_normalize( *searchbase );
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/* Skip the attrs */
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start = end+1;
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end = strchr( start, '?' );
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if( end == NULL ) {
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return( LDAP_SUCCESS );
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}
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/* Grab the scope */
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start = end+1;
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if( !strncasecmp( start, "base?", 5 )) {
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*scope = LDAP_SCOPE_BASE;
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start += 5;
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}
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else if( !strncasecmp( start, "one?", 4 )) {
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*scope = LDAP_SCOPE_ONELEVEL;
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start += 4;
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}
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else if( !strncasecmp( start, "sub?", 3 )) {
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*scope = LDAP_SCOPE_SUBTREE;
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start += 4;
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}
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else {
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ch_free( *searchbase );
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*searchbase = NULL;
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return( LDAP_PROTOCOL_ERROR );
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}
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/* Grab the filter */
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*filter = str2filter( start );
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return( LDAP_SUCCESS );
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}
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int slap_sasl_regexp_config( const char *match, const char *replace )
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{
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#ifdef HAVE_CYRUS_SASL
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const char *c;
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int rc, n;
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SaslRegexp_t *reg;
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SaslRegexp = (SaslRegexp_t *) ch_realloc( (char *) SaslRegexp,
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(nSaslRegexp + 1) * sizeof(SaslRegexp_t) );
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reg = &( SaslRegexp[nSaslRegexp] );
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reg->match = ch_strdup( match );
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reg->replace = ch_strdup( replace );
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dn_normalize( reg->match );
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dn_normalize( reg->replace );
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/* Precompile matching pattern */
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rc = regcomp( ®->workspace, reg->match, REG_EXTENDED|REG_ICASE );
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if ( rc ) {
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#ifdef NEW_LOGGING
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LDAP_LOG(( "sasl", LDAP_LEVEL_ERR,
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"slap_sasl_regexp_config: \"%s\" could not be compiled.\n"
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reg->match ));
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#else
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Debug( LDAP_DEBUG_ANY,
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"SASL match pattern %s could not be compiled by regexp engine\n",
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reg->match, 0, 0 );
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#endif
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return( LDAP_OPERATIONS_ERROR );
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}
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/* Precompile replace pattern. Find the $<n> placeholders */
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reg->offset[0] = -2;
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n = 1;
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for ( c = reg->replace; *c; c++ ) {
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if ( *c == '\\' ) {
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c++;
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continue;
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}
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if ( *c == '$' ) {
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if ( n == SASLREGEX_REPLACE ) {
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#ifdef NEW_LOGGING
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LDAP_LOG(( "sasl", LDAP_LEVEL_ERR,
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"slap_sasl_regexp_config: \"%s\" has too many $n placeholders (max %d)\n",
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reg->replace, SASLREGEX_REPLACE ));
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#else
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Debug( LDAP_DEBUG_ANY,
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"SASL replace pattern %s has too many $n placeholders (max %d)\n",
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reg->replace, SASLREGEX_REPLACE, 0 );
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#endif
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return( LDAP_OPERATIONS_ERROR );
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}
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reg->offset[n] = c - reg->replace;
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n++;
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}
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}
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/* Final placeholder, after the last $n */
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reg->offset[n] = c - reg->replace;
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n++;
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reg->offset[n] = -1;
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nSaslRegexp++;
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#endif
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return( LDAP_SUCCESS );
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}
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#ifdef HAVE_CYRUS_SASL
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/* Take the passed in SASL name and attempt to convert it into an
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LDAP URI to find the matching LDAP entry, using the pattern matching
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strings given in the saslregexp config file directive(s) */
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static
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char *slap_sasl_regexp( char *saslname )
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{
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char *uri=NULL;
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int i, n, len, insert;
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SaslRegexp_t *reg;
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#ifdef NEW_LOGGING
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LDAP_LOG(( "sasl", LDAP_LEVEL_ENTRY,
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"slap_sasl_regexp: converting SASL name %s\n", saslname ));
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#else
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Debug( LDAP_DEBUG_TRACE, "slap_sasl_regexp: converting SASL name %s\n",
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saslname, 0, 0 );
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#endif
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if (( saslname == NULL ) || ( nSaslRegexp == 0 ))
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return( NULL );
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/* Match the normalized SASL name to the saslregexp patterns */
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for( reg = SaslRegexp,i=0; i<nSaslRegexp; i++,reg++ ) {
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if ( regexec( ®->workspace, saslname, SASLREGEX_REPLACE,
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reg->strings, 0) == 0 )
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break;
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}
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if( i >= nSaslRegexp )
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return( NULL );
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/*
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* The match pattern may have been of the form "a(b.*)c(d.*)e" and the
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* replace pattern of the form "x$1y$2z". The returned string needs
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* to replace the $1,$2 with the strings that matched (b.*) and (d.*)
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*/
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/* Get the total length of the final URI */
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n=1;
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len = 0;
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while( reg->offset[n] >= 0 ) {
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/* Len of next section from replacement string (x,y,z above) */
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len += reg->offset[n] - reg->offset[n-1] - 2;
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if( reg->offset[n+1] < 0)
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break;
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/* Len of string from saslname that matched next $i (b,d above) */
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i = reg->replace[ reg->offset[n] + 1 ] - '0';
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len += reg->strings[i].rm_eo - reg->strings[i].rm_so;
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n++;
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}
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uri = ch_malloc( len + 1 );
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/* Fill in URI with replace string, replacing $i as we go */
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n=1;
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insert = 0;
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while( reg->offset[n] >= 0) {
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/* Paste in next section from replacement string (x,y,z above) */
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len = reg->offset[n] - reg->offset[n-1] - 2;
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strncpy( uri+insert, reg->replace + reg->offset[n-1] + 2, len);
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insert += len;
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if( reg->offset[n+1] < 0)
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break;
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/* Paste in string from saslname that matched next $i (b,d above) */
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i = reg->replace[ reg->offset[n] + 1 ] - '0';
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len = reg->strings[i].rm_eo - reg->strings[i].rm_so;
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strncpy( uri+insert, saslname + reg->strings[i].rm_so, len );
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insert += len;
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n++;
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}
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uri[insert] = '\0';
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#ifdef NEW_LOGGING
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LDAP_LOG(( "sasl", LDAP_LEVEL_ENTRY,
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"slap_sasl_regexp: converted SASL name to %s\n", uri ));
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#else
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Debug( LDAP_DEBUG_TRACE,
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"slap_sasl_regexp: converted SASL name to %s\n", uri, 0, 0 );
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#endif
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return( uri );
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}
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/*
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* Given a SASL name (e.g. "UID=name,cn=REALM,cn=MECH,cn=AUTHZID")
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* return the LDAP DN to which it matches. The SASL regexp rules in the config
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* file turn the SASL name into an LDAP URI. If the URI is just a DN (or a
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* search with scope=base), just return the URI (or its searchbase). Otherwise
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* an internal search must be done, and if that search returns exactly one
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* entry, return the DN of that one entry.
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*/
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char *slap_sasl2dn( char *saslname )
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{
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char *uri=NULL, *searchbase=NULL, *DN=NULL;
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int rc, scope;
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Backend *be;
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Filter *filter=NULL;
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Connection *conn=NULL;
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LDAP *client=NULL;
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LDAPMessage *res=NULL, *msg;
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#ifdef NEW_LOGGING
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LDAP_LOG(( "sasl", LDAP_LEVEL_ENTRY,
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"slap_sasl2dn: converting SASL name %s to DN.\n", saslname ));
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#else
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Debug( LDAP_DEBUG_TRACE,
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"==>slap_sasl2dn: Converting SASL name %s to a DN\n", saslname, 0,0 );
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#endif
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/* Convert the SASL name into an LDAP URI */
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uri = slap_sasl_regexp( saslname );
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if( uri == NULL )
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goto FINISHED;
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rc = slap_parseURI( uri, &searchbase, &scope, &filter );
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if( rc )
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goto FINISHED;
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/* Massive shortcut: search scope == base */
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if( scope == LDAP_SCOPE_BASE ) {
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DN = ch_strdup( searchbase );
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goto FINISHED;
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}
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/* Must do an internal search */
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#ifdef NEW_LOGGING
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LDAP_LOG(( "sasl", LDAP_LEVEL_DETAIL1,
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"slap_sasl2dn: performing internal search (base=%s, scope=%s)\n",
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searchbase, scope ));
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#else
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Debug( LDAP_DEBUG_TRACE,
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"slap_sasl2dn: performing internal search (base=%s, scope=%d)\n",
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searchbase, scope, 0 );
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#endif
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be = select_backend( searchbase, 0 );
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if(( be == NULL ) || ( be->be_search == NULL))
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goto FINISHED;
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searchbase = suffix_alias( be, searchbase );
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rc = connection_internal_open( &conn, &client, saslname );
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if( rc != LDAP_SUCCESS )
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goto FINISHED;
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(*be->be_search)( be, conn, conn->c_ops, /*base=*/NULL, searchbase,
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scope, /*deref=*/1, /*sizelimit=*/1, /*time=*/0, filter, /*fstr=*/NULL,
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/*attrs=*/NULL, /*attrsonly=*/0 );
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/* Read the client side of the internal search */
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rc = ldap_result( client, LDAP_RES_ANY, LDAP_MSG_ALL, NULL, &res );
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if( rc == -1 )
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goto FINISHED;
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/* Make sure exactly one entry was returned */
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rc = ldap_count_entries( client, res );
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#ifdef NEW_LOGGING
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LDAP_LOG(( "sasl", LDAP_LEVEL_DETAIL1,
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"slap_sasl2dn: search DN returned %d entries\n", rc ));
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#else
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Debug( LDAP_DEBUG_TRACE,
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"slap_sasl2dn: search DN returned %d entries\n", rc,0,0 );
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#endif
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if( rc != 1 )
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goto FINISHED;
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msg = ldap_first_entry( client, res );
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DN = ldap_get_dn( client, msg );
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FINISHED:
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if( searchbase ) ch_free( searchbase );
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if( filter ) filter_free( filter );
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if( uri ) ch_free( uri );
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if( conn ) connection_internal_close( conn );
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if( res ) ldap_msgfree( res );
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if( client ) ldap_unbind( client );
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if( DN ) dn_normalize( DN );
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#ifdef NEW_LOGGING
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LDAP_LOG(( "sasl", LDAP_LEVEL_ENTRY,
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"slap_sasl2dn: Converted SASL name to %s\n", DN ? DN : "<nothing>" ));
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#else
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Debug( LDAP_DEBUG_TRACE, "<==slap_sasl2dn: Converted SASL name to %s\n",
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DN ? DN : "<nothing>", 0, 0 );
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#endif
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return( DN );
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}
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/*
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* Map a SASL regexp rule to a DN. If the rule is just a DN or a scope=base
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* URI, just strcmp the rule (or its searchbase) to the *assertDN. Otherwise,
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* the rule must be used as an internal search for entries. If that search
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* returns the *assertDN entry, the match is successful.
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*
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* The assertDN should not have the dn: prefix
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*/
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static
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int slap_sasl_match( char *rule, char *assertDN, char *authc )
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{
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char *searchbase=NULL, *dn=NULL;
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int rc, scope;
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Backend *be;
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Filter *filter=NULL;
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Connection *conn=NULL;
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LDAP *client=NULL;
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LDAPMessage *res=NULL, *msg;
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regex_t reg;
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#ifdef NEW_LOGGING
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LDAP_LOG(( "sasl", LDAP_LEVEL_ENTRY,
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"slap_sasl_match: comparing DN %s to rule %s\n", assertDN, rule );
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#else
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Debug( LDAP_DEBUG_TRACE,
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"===>slap_sasl_match: comparing DN %s to rule %s\n", assertDN, rule, 0 );
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#endif
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rc = slap_parseURI( rule, &searchbase, &scope, &filter );
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if( rc != LDAP_SUCCESS )
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goto CONCLUDED;
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/* Massive shortcut: search scope == base */
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if( scope == LDAP_SCOPE_BASE ) {
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dn_normalize( searchbase );
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rc = regcomp(®, searchbase, REG_EXTENDED|REG_ICASE|REG_NOSUB);
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if ( rc == 0 ) {
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rc = regexec(®, assertDN, 0, NULL, 0);
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regfree( ® );
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}
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if ( rc == 0 )
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rc = LDAP_SUCCESS;
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else
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rc = LDAP_INAPPROPRIATE_AUTH;
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goto CONCLUDED;
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}
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/* Must run an internal search. */
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#ifdef NEW_LOGGING
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LDAP_LOG(( "sasl", LDAP_LEVEL_DETAIL1,
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"slap_sasl_match: performing internal search (base=%s, scope=%d)\n",
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searchbase, scope ));
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#else
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Debug( LDAP_DEBUG_TRACE,
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"slap_sasl_match: performing internal search (base=%s, scope=%d)\n",
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searchbase, scope, 0 );
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#endif
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be = select_backend( searchbase, 0 );
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if(( be == NULL ) || ( be->be_search == NULL)) {
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rc = LDAP_INAPPROPRIATE_AUTH;
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goto CONCLUDED;
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}
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searchbase = suffix_alias( be, searchbase );
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/* Make an internal connection on which to run the search */
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rc = connection_internal_open( &conn, &client, authc );
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if( rc != LDAP_SUCCESS )
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goto CONCLUDED;
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(*be->be_search)( be, conn, conn->c_ops, /*base=*/NULL, searchbase,
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scope, /*deref=*/1, /*sizelimit=*/0, /*time=*/0, filter, /*fstr=*/NULL,
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/*attrs=*/NULL, /*attrsonly=*/0 );
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/* On the client side of the internal search, read the results. Check
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if the assertDN matches any of the DN's returned by the search */
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rc = ldap_result( client, LDAP_RES_ANY, LDAP_MSG_ALL, NULL, &res );
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if( rc == -1 )
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goto CONCLUDED;
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for( msg=ldap_first_entry( client, res );
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msg;
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msg=ldap_next_entry( client, msg ) ) {
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dn = ldap_get_dn( client, msg );
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dn_normalize( dn );
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rc = strcmp( dn, assertDN );
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ch_free( dn );
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if( rc == 0 ) {
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rc = LDAP_SUCCESS;
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goto CONCLUDED;
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}
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}
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rc = LDAP_INAPPROPRIATE_AUTH;
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CONCLUDED:
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if( searchbase ) ch_free( searchbase );
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if( filter ) filter_free( filter );
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if( conn ) connection_internal_close( conn );
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if( res ) ldap_msgfree( res );
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if( client ) ldap_unbind( client );
|
|
#ifdef NEW_LOGGING
|
|
LDAP_LOG(( "sasl", LDAP_LEVEL_ENTRY,
|
|
"slap_sasl_match: comparison returned %d\n", rc ));
|
|
#else
|
|
Debug( LDAP_DEBUG_TRACE,
|
|
"<===slap_sasl_match: comparison returned %d\n", rc, 0, 0);
|
|
#endif
|
|
|
|
return( rc );
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
/*
|
|
* This function answers the question, "Can this ID authorize to that ID?",
|
|
* based on authorization rules. The rules are stored in the *searchDN, in the
|
|
* attribute named by *attr. If any of those rules map to the *assertDN, the
|
|
* authorization is approved.
|
|
*
|
|
* DN's passed in should have a dn: prefix
|
|
*/
|
|
|
|
static int
|
|
slap_sasl_check_authz(char *searchDN, char *assertDN, char *attr, char *authc)
|
|
{
|
|
const char *errmsg;
|
|
int i, rc;
|
|
struct berval **vals=NULL;
|
|
AttributeDescription *ad=NULL;
|
|
|
|
|
|
#ifdef NEW_LOGGING
|
|
LDAP_LOG(( "sasl", LDAP_LEVEL_ENTRY,
|
|
"slap_sasl_check_authz: does %s match %s rule in %s?\n",
|
|
assertDN, attr, searchDN ));
|
|
#else
|
|
Debug( LDAP_DEBUG_TRACE,
|
|
"==>slap_sasl_check_authz: does %s match %s rule in %s?\n",
|
|
assertDN, attr, searchDN);
|
|
#endif
|
|
|
|
rc = slap_str2ad( attr, &ad, &errmsg );
|
|
if( rc != LDAP_SUCCESS )
|
|
goto COMPLETE;
|
|
|
|
rc = backend_attribute( NULL, NULL, NULL, NULL, searchDN+3, ad, &vals );
|
|
if( rc != LDAP_SUCCESS )
|
|
goto COMPLETE;
|
|
|
|
/* Check if the *assertDN matches any **vals */
|
|
for( i=0; vals[i] != NULL; i++ ) {
|
|
rc = slap_sasl_match( vals[i]->bv_val, assertDN+3, authc );
|
|
if ( rc == LDAP_SUCCESS )
|
|
goto COMPLETE;
|
|
}
|
|
rc = LDAP_INAPPROPRIATE_AUTH;
|
|
|
|
COMPLETE:
|
|
if( vals ) ber_bvecfree( vals );
|
|
if( ad ) ad_free( ad, 1 );
|
|
|
|
#ifdef NEW_LOGGING
|
|
LDAP_LOG(( "sasl", LDAP_LEVEL_ENTRY,
|
|
"slap_sasl_check_authz: %s check returning %s\n", attr, rc ));
|
|
#else
|
|
Debug( LDAP_DEBUG_TRACE,
|
|
"<==slap_sasl_check_authz: %s check returning %d\n", attr, rc, 0);
|
|
#endif
|
|
|
|
return( rc );
|
|
}
|
|
|
|
|
|
|
|
#endif /* HAVE_CYRUS_SASL */
|
|
|
|
|
|
|
|
|
|
|
|
/* Check if a bind can SASL authorize to another identity.
|
|
Accepts authorization DN's with "dn:" prefix */
|
|
|
|
int slap_sasl_authorized( char *authcDN, char *authzDN )
|
|
{
|
|
int rc;
|
|
|
|
#ifdef HAVE_CYRUS_SASL
|
|
/* User binding as anonymous */
|
|
if ( authzDN == NULL ) {
|
|
rc = LDAP_SUCCESS;
|
|
goto DONE;
|
|
}
|
|
|
|
#ifdef NEW_LOGGING
|
|
LDAP_LOG(( "sasl", LDAP_LEVEL_ENTRY,
|
|
"slap_sasl_authorized: can %s become %s?\n", authcDN, authzDN ));
|
|
#else
|
|
Debug( LDAP_DEBUG_TRACE,
|
|
"==>slap_sasl_authorized: can %s become %s?\n", authcDN, authzDN, 0 );
|
|
#endif
|
|
|
|
|
|
/* If person is authorizing to self, succeed */
|
|
if ( !strcmp( authcDN, authzDN ) ) {
|
|
rc = LDAP_SUCCESS;
|
|
goto DONE;
|
|
}
|
|
|
|
/* Check source rules */
|
|
rc = slap_sasl_check_authz( authcDN, authzDN, SASL_AUTHZ_SOURCE_ATTR,
|
|
authcDN );
|
|
if( rc == LDAP_SUCCESS )
|
|
goto DONE;
|
|
|
|
/* Check destination rules */
|
|
rc = slap_sasl_check_authz( authzDN, authcDN, SASL_AUTHZ_DEST_ATTR,
|
|
authcDN );
|
|
if( rc == LDAP_SUCCESS )
|
|
goto DONE;
|
|
|
|
#endif
|
|
rc = LDAP_INAPPROPRIATE_AUTH;
|
|
|
|
DONE:
|
|
#ifdef NEW_LOGGING
|
|
LDAP_LOG(( "sasl", LDAP_LEVEL_ENTRY,
|
|
"slap_sasl_authorized: return %s\n", rc ));
|
|
#else
|
|
Debug( LDAP_DEBUG_TRACE, "<== slap_sasl_authorized: return %d\n",rc,0,0 );
|
|
#endif
|
|
|
|
return( rc );
|
|
}
|