Adding upstream version 2.5.13+dfsg.upstream/2.5.13+dfsgupstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 1355 insertions, 0 deletions

diff --git a/servers/slapd/limits.c b/servers/slapd/limits.c
new file mode 100644
index 0000000..2e4d051
--- /dev/null
+++ b/servers/slapd/limits.c
@@ -0,0 +1,1355 @@
+/* limits.c - routines to handle regex-based size and time limits */
+/* $OpenLDAP$ */
+/* This work is part of OpenLDAP Software <http://www.openldap.org/>.
+ *
+ * Copyright 1998-2022 The OpenLDAP Foundation.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted only as authorized by the OpenLDAP
+ * Public License.
+ *
+ * A copy of this license is available in the file LICENSE in the
+ * top-level directory of the distribution or, alternatively, at
+ * <http://www.OpenLDAP.org/license.html>.
+ */
+
+#include "portable.h"
+
+#include <stdio.h>
+
+#include <ac/ctype.h>
+#include <ac/regex.h>
+#include <ac/string.h>
+
+#include "slap.h"
+#include "lutil.h"
+
+/* define to get an error if requesting limit higher than hard */
+#undef ABOVE_HARD_LIMIT_IS_ERROR
+
+static const struct berval lmpats[] = {
+	BER_BVC( "base" ),
+	BER_BVC( "base" ),
+	BER_BVC( "onelevel" ),
+	BER_BVC( "subtree" ),
+	BER_BVC( "children" ),
+	BER_BVC( "regex" ),
+	BER_BVC( "anonymous" ),
+	BER_BVC( "users" ),
+	BER_BVC( "*" )
+};
+
+#ifdef LDAP_DEBUG
+static const char *const dn_source[2] = { "DN", "DN.THIS" };
+static const char *const lmpats_out[] = {
+	"UNDEFINED",
+	"EXACT",
+	"ONELEVEL",
+	"SUBTREE",
+	"CHILDREN",
+	"REGEX",
+	"ANONYMOUS",
+	"USERS",
+	"ANY"
+};
+
+static const char *
+limits2str( unsigned i )
+{
+	return i < (sizeof( lmpats_out ) / sizeof( lmpats_out[0] ))
+		? lmpats_out[i] : "UNKNOWN";
+}
+#endif /* LDAP_DEBUG */
+
+static int
+limits_get( 
+	Operation		*op,
+	struct slap_limits_set 	**limit
+)
+{
+	static struct berval empty_dn = BER_BVC( "" );
+	struct slap_limits **lm;
+	struct berval		*ndns[2];
+
+	assert( op != NULL );
+	assert( limit != NULL );
+
+	ndns[0] = &op->o_ndn;
+	ndns[1] = &op->o_req_ndn;
+
+	Debug( LDAP_DEBUG_TRACE, "==> limits_get: %s self=\"%s\" this=\"%s\"\n",
+			op->o_log_prefix,
+			BER_BVISNULL( ndns[0] ) ? "[anonymous]" : ndns[0]->bv_val,
+			BER_BVISNULL( ndns[1] ) ? "" : ndns[1]->bv_val );
+	/*
+	 * default values
+	 */
+	*limit = &op->o_bd->be_def_limit;
+
+	if ( op->o_bd->be_limits == NULL ) {
+		return( 0 );
+	}
+
+	for ( lm = op->o_bd->be_limits; lm[0] != NULL; lm++ ) {
+		unsigned	style = lm[0]->lm_flags & SLAP_LIMITS_MASK;
+		unsigned	type = lm[0]->lm_flags & SLAP_LIMITS_TYPE_MASK;
+		unsigned	isthis = type == SLAP_LIMITS_TYPE_THIS;
+		struct berval *ndn = ndns[isthis];
+
+		if ( style == SLAP_LIMITS_ANY )
+			goto found_any;
+
+		if ( BER_BVISEMPTY( ndn ) ) {
+			if ( style == SLAP_LIMITS_ANONYMOUS )
+				goto found_nodn;
+			if ( !isthis )
+				continue;
+			ndn = &empty_dn;
+		}
+
+		switch ( style ) {
+		case SLAP_LIMITS_EXACT:
+			if ( type == SLAP_LIMITS_TYPE_GROUP ) {
+				int	rc = backend_group( op, NULL,
+						&lm[0]->lm_pat, ndn,
+						lm[0]->lm_group_oc,
+						lm[0]->lm_group_ad );
+				if ( rc == 0 ) {
+					goto found_group;
+				}
+			} else {
+				if ( dn_match( &lm[0]->lm_pat, ndn ) ) {
+					goto found_dn;
+				}
+			}
+			break;
+
+		case SLAP_LIMITS_ONE:
+		case SLAP_LIMITS_SUBTREE:
+		case SLAP_LIMITS_CHILDREN: {
+			ber_len_t d;
+			
+			/* ndn shorter than lm_pat */
+			if ( ndn->bv_len < lm[0]->lm_pat.bv_len ) {
+				break;
+			}
+			d = ndn->bv_len - lm[0]->lm_pat.bv_len;
+
+			if ( d == 0 ) {
+				/* allow exact match for SUBTREE only */
+				if ( style != SLAP_LIMITS_SUBTREE ) {
+					break;
+				}
+			} else {
+				/* check for unescaped rdn separator */
+				if ( !DN_SEPARATOR( ndn->bv_val[d - 1] ) ) {
+					break;
+				}
+			}
+
+			/* check that ndn ends with lm_pat */
+			if ( strcmp( lm[0]->lm_pat.bv_val, &ndn->bv_val[d] ) != 0 ) {
+				break;
+			}
+
+			/* in case of ONE, require exactly one rdn below lm_pat */
+			if ( style == SLAP_LIMITS_ONE ) {
+				if ( dn_rdnlen( NULL, ndn ) != d - 1 ) {
+					break;
+				}
+			}
+
+			goto found_dn;
+		}
+
+		case SLAP_LIMITS_REGEX:
+			if ( regexec( &lm[0]->lm_regex, ndn->bv_val, 0, NULL, 0 ) == 0 ) {
+				goto found_dn;
+			}
+			break;
+
+		case SLAP_LIMITS_ANONYMOUS:
+			break;
+
+		case SLAP_LIMITS_USERS:
+		found_nodn:
+			Debug( LDAP_DEBUG_TRACE, "<== limits_get: type=%s match=%s\n",
+				dn_source[isthis], limits2str( style ) );
+		found_any:
+			*limit = &lm[0]->lm_limits;
+			return( 0 );
+
+		found_dn:
+			Debug( LDAP_DEBUG_TRACE,
+				"<== limits_get: type=%s match=%s dn=\"%s\"\n",
+				dn_source[isthis], limits2str( style ), lm[0]->lm_pat.bv_val );
+			*limit = &lm[0]->lm_limits;
+			return( 0 );
+
+		found_group:
+			Debug( LDAP_DEBUG_TRACE, "<== limits_get: type=GROUP match=EXACT "
+				"dn=\"%s\" oc=\"%s\" ad=\"%s\"\n",
+				lm[0]->lm_pat.bv_val,
+				lm[0]->lm_group_oc->soc_cname.bv_val,
+				lm[0]->lm_group_ad->ad_cname.bv_val );
+			*limit = &lm[0]->lm_limits;
+			return( 0 );
+
+		default:
+			assert( 0 );	/* unreachable */
+			return( -1 );
+		}
+	}
+
+	return( 0 );
+}
+
+static int
+limits_add(
+	Backend 	        *be,
+	unsigned		flags,
+	const char		*pattern,
+	ObjectClass		*group_oc,
+	AttributeDescription	*group_ad,
+	struct slap_limits_set	*limit
+)
+{
+	int 			i;
+	struct slap_limits	*lm;
+	unsigned		type, style;
+	
+	assert( be != NULL );
+	assert( limit != NULL );
+
+	type = flags & SLAP_LIMITS_TYPE_MASK;
+	style = flags & SLAP_LIMITS_MASK;
+
+	switch ( style ) {
+	case SLAP_LIMITS_ANONYMOUS:
+	case SLAP_LIMITS_USERS:
+	case SLAP_LIMITS_ANY:
+		/* For these styles, type == 0 (SLAP_LIMITS_TYPE_SELF). */
+		for ( i = 0; be->be_limits && be->be_limits[ i ]; i++ ) {
+			if ( be->be_limits[ i ]->lm_flags == style ) {
+				return( -1 );
+			}
+		}
+		break;
+	}
+
+
+	lm = ( struct slap_limits * )ch_calloc( sizeof( struct slap_limits ), 1 );
+
+	switch ( style ) {
+	case SLAP_LIMITS_UNDEFINED:
+		style = SLAP_LIMITS_EXACT;
+		/* continue to next cases */
+	case SLAP_LIMITS_EXACT:
+	case SLAP_LIMITS_ONE:
+	case SLAP_LIMITS_SUBTREE:
+	case SLAP_LIMITS_CHILDREN:
+		{
+			int rc;
+			struct berval bv;
+
+			ber_str2bv( pattern, 0, 0, &bv );
+
+			rc = dnNormalize( 0, NULL, NULL, &bv, &lm->lm_pat, NULL );
+			if ( rc != LDAP_SUCCESS ) {
+				ch_free( lm );
+				return( -1 );
+			}
+		}
+		break;
+		
+	case SLAP_LIMITS_REGEX:
+		ber_str2bv( pattern, 0, 1, &lm->lm_pat );
+		if ( regcomp( &lm->lm_regex, lm->lm_pat.bv_val, 
+					REG_EXTENDED | REG_ICASE ) ) {
+			free( lm->lm_pat.bv_val );
+			ch_free( lm );
+			return( -1 );
+		}
+		break;
+
+	case SLAP_LIMITS_ANONYMOUS:
+	case SLAP_LIMITS_USERS:
+	case SLAP_LIMITS_ANY:
+		BER_BVZERO( &lm->lm_pat );
+		break;
+	}
+
+	switch ( type ) {
+	case SLAP_LIMITS_TYPE_GROUP:
+		assert( group_oc != NULL );
+		assert( group_ad != NULL );
+		lm->lm_group_oc = group_oc;
+		lm->lm_group_ad = group_ad;
+		break;
+	}
+
+	lm->lm_flags = style | type;
+	lm->lm_limits = *limit;
+
+	i = 0;
+	if ( be->be_limits != NULL ) {
+		for ( ; be->be_limits[i]; i++ );
+	}
+
+	be->be_limits = ( struct slap_limits ** )ch_realloc( be->be_limits,
+			sizeof( struct slap_limits * ) * ( i + 2 ) );
+	be->be_limits[i] = lm;
+	be->be_limits[i+1] = NULL;
+	
+	return( 0 );
+}
+
+#define STRSTART( s, m ) (strncasecmp( s, m, STRLENOF( "" m "" )) == 0)
+
+int
+limits_parse(
+	Backend     *be,
+	const char  *fname,
+	int         lineno,
+	int         argc,
+	char        **argv
+)
+{
+	int			flags = SLAP_LIMITS_UNDEFINED;
+	char			*pattern;
+	struct slap_limits_set 	limit;
+	int 			i, rc = 0;
+	ObjectClass		*group_oc = NULL;
+	AttributeDescription	*group_ad = NULL;
+
+	assert( be != NULL );
+
+	if ( argc < 3 ) {
+		Debug( LDAP_DEBUG_ANY,
+			"%s : line %d: missing arg(s) in "
+			"\"limits <pattern> <limits>\" line.\n",
+			fname, lineno );
+		return( -1 );
+	}
+
+	limit = be->be_def_limit;
+
+	/*
+	 * syntax:
+	 *
+	 * "limits" <pattern> <limit> [ ... ]
+	 * 
+	 * 
+	 * <pattern>:
+	 * 
+	 * "anonymous"
+	 * "users"
+	 * [ "dn" [ "." { "this" | "self" } ] [ "." { "exact" | "base" |
+	 *	"onelevel" | "subtree" | "children" | "regex" | "anonymous" } ]
+	 *	"=" ] <dn pattern>
+	 *
+	 * Note:
+	 *	"this" is the baseobject, "self" (the default) is the bound DN
+	 *	"exact" and "base" are the same (exact match);
+	 *	"onelevel" means exactly one rdn below, NOT including pattern
+	 *	"subtree" means any rdn below, including pattern
+	 *	"children" means any rdn below, NOT including pattern
+	 *	
+	 *	"anonymous" may be deprecated in favour 
+	 *	of the pattern = "anonymous" form
+	 *
+	 * "group[/objectClass[/attributeType]]" "=" "<dn pattern>"
+	 *
+	 * <limit>:
+	 *
+	 * "time" [ "." { "soft" | "hard" } ] "=" <integer>
+	 *
+	 * "size" [ "." { "soft" | "hard" | "unchecked" } ] "=" <integer>
+	 */
+	
+	pattern = argv[1];
+	if ( strcmp( pattern, "*" ) == 0) {
+		flags = SLAP_LIMITS_ANY;
+
+	} else if ( strcasecmp( pattern, "anonymous" ) == 0 ) {
+		flags = SLAP_LIMITS_ANONYMOUS;
+
+	} else if ( strcasecmp( pattern, "users" ) == 0 ) {
+		flags = SLAP_LIMITS_USERS;
+		
+	} else if ( STRSTART( pattern, "dn" ) ) {
+		pattern += STRLENOF( "dn" );
+		flags = SLAP_LIMITS_TYPE_SELF;
+		if ( pattern[0] == '.' ) {
+			pattern++;
+			if ( STRSTART( pattern, "this" ) ) {
+				flags = SLAP_LIMITS_TYPE_THIS;
+				pattern += STRLENOF( "this" );
+			} else if ( STRSTART( pattern, "self" ) ) {
+				pattern += STRLENOF( "self" );
+			} else {
+				goto got_dn_dot;
+			}
+		}
+		if ( pattern[0] == '.' ) {
+			pattern++;
+		got_dn_dot:
+			if ( STRSTART( pattern, "exact" ) ) {
+				flags |= SLAP_LIMITS_EXACT;
+				pattern += STRLENOF( "exact" );
+
+			} else if ( STRSTART( pattern, "base" ) ) {
+				flags |= SLAP_LIMITS_BASE;
+				pattern += STRLENOF( "base" );
+
+			} else if ( STRSTART( pattern, "one" ) ) {
+				flags |= SLAP_LIMITS_ONE;
+				pattern += STRLENOF( "one" );
+				if ( STRSTART( pattern, "level" ) ) {
+					pattern += STRLENOF( "level" );
+
+				} else {
+					Debug( LDAP_DEBUG_ANY,
+						"%s : line %d: deprecated \"one\" style "
+						"\"limits <pattern> <limits>\" line; "
+						"use \"onelevel\" instead.\n", fname, lineno );
+				}
+
+			} else if ( STRSTART( pattern, "sub" ) ) {
+				flags |= SLAP_LIMITS_SUBTREE;
+				pattern += STRLENOF( "sub" );
+				if ( STRSTART( pattern, "tree" ) ) {
+					pattern += STRLENOF( "tree" );
+
+				} else {
+					Debug( LDAP_DEBUG_ANY,
+						"%s : line %d: deprecated \"sub\" style "
+						"\"limits <pattern> <limits>\" line; "
+						"use \"subtree\" instead.\n", fname, lineno );
+				}
+
+			} else if ( STRSTART( pattern, "children" ) ) {
+				flags |= SLAP_LIMITS_CHILDREN;
+				pattern += STRLENOF( "children" );
+
+			} else if ( STRSTART( pattern, "regex" ) ) {
+				flags |= SLAP_LIMITS_REGEX;
+				pattern += STRLENOF( "regex" );
+
+			/* 
+			 * this could be deprecated in favour
+			 * of the pattern = "anonymous" form
+			 */
+			} else if ( STRSTART( pattern, "anonymous" )
+					&& flags == SLAP_LIMITS_TYPE_SELF )
+			{
+				flags = SLAP_LIMITS_ANONYMOUS;
+				pattern = NULL;
+
+			} else {
+				/* force error below */
+				if ( *pattern == '=' )
+					--pattern;
+			}
+		}
+
+		/* pre-check the data */
+		if ( pattern != NULL ) {
+			if ( pattern[0] != '=' ) {
+				Debug( LDAP_DEBUG_ANY,
+					"%s : line %d: %s in "
+					"\"dn[.{this|self}][.{exact|base"
+					"|onelevel|subtree|children|regex"
+					"|anonymous}]=<pattern>\" in "
+					"\"limits <pattern> <limits>\" line.\n",
+					fname, lineno,
+					isalnum( (unsigned char)pattern[0] )
+					? "unknown DN modifier" : "missing '='" );
+				return( -1 );
+			}
+
+			/* skip '=' (required) */
+			pattern++;
+
+			/* trim obvious cases */
+			if ( strcmp( pattern, "*" ) == 0 ) {
+				flags = SLAP_LIMITS_ANY;
+				pattern = NULL;
+
+			} else if ( (flags & SLAP_LIMITS_MASK) == SLAP_LIMITS_REGEX
+					&& strcmp( pattern, ".*" ) == 0 ) {
+				flags = SLAP_LIMITS_ANY;
+				pattern = NULL;
+			}
+		}
+
+	} else if (STRSTART( pattern, "group" ) ) {
+		pattern += STRLENOF( "group" );
+
+		if ( pattern[0] == '/' ) {
+			struct berval	oc, ad;
+
+			oc.bv_val = pattern + 1;
+			pattern = strchr( pattern, '=' );
+			if ( pattern == NULL ) {
+				return -1;
+			}
+
+			ad.bv_val = strchr( oc.bv_val, '/' );
+			if ( ad.bv_val != NULL ) {
+				const char	*text = NULL;
+
+				oc.bv_len = ad.bv_val - oc.bv_val;
+
+				ad.bv_val++;
+				ad.bv_len = pattern - ad.bv_val;
+				rc = slap_bv2ad( &ad, &group_ad, &text );
+				if ( rc != LDAP_SUCCESS ) {
+					goto no_ad;
+				}
+
+			} else {
+				oc.bv_len = pattern - oc.bv_val;
+			}
+
+			group_oc = oc_bvfind( &oc );
+			if ( group_oc == NULL ) {
+				goto no_oc;
+			}
+		}
+
+		if ( group_oc == NULL ) {
+			group_oc = oc_find( SLAPD_GROUP_CLASS );
+			if ( group_oc == NULL ) {
+no_oc:;
+				return( -1 );
+			}
+		}
+
+		if ( group_ad == NULL ) {
+			const char	*text = NULL;
+			
+			rc = slap_str2ad( SLAPD_GROUP_ATTR, &group_ad, &text );
+
+			if ( rc != LDAP_SUCCESS ) {
+no_ad:;
+				return( -1 );
+			}
+		}
+
+		flags = SLAP_LIMITS_TYPE_GROUP | SLAP_LIMITS_EXACT;
+
+		if ( pattern[0] != '=' ) {
+			Debug( LDAP_DEBUG_ANY,
+				"%s : line %d: missing '=' in "
+				"\"group[/objectClass[/attributeType]]"
+				"=<pattern>\" in "
+				"\"limits <pattern> <limits>\" line.\n",
+				fname, lineno );
+			return( -1 );
+		}
+
+		/* skip '=' (required) */
+		pattern++;
+	}
+
+	/* get the limits */
+	for ( i = 2; i < argc; i++ ) {
+		if ( limits_parse_one( argv[i], &limit ) ) {
+
+			Debug( LDAP_DEBUG_ANY,
+				"%s : line %d: unknown limit values \"%s\" in "
+				"\"limits <pattern> <limits>\" line.\n",
+			fname, lineno, argv[i] );
+
+			return( 1 );
+		}
+	}
+
+	/*
+	 * sanity checks ...
+	 *
+	 * FIXME: add warnings?
+	 */
+	if ( limit.lms_t_hard > 0 && 
+			( limit.lms_t_hard < limit.lms_t_soft 
+			  || limit.lms_t_soft == -1 ) ) {
+		limit.lms_t_hard = limit.lms_t_soft;
+	}
+	
+	if ( limit.lms_s_hard > 0 && 
+			( limit.lms_s_hard < limit.lms_s_soft 
+			  || limit.lms_s_soft == -1 ) ) {
+		limit.lms_s_hard = limit.lms_s_soft;
+	}
+
+	/*
+	 * defaults ...
+	 * 
+	 * lms_t_hard:
+	 * 	-1	=> no limits
+	 * 	0	=> same as soft
+	 * 	> 0	=> limit (in seconds)
+	 *
+	 * lms_s_hard:
+	 * 	-1	=> no limits
+	 * 	0	0> same as soft
+	 * 	> 0	=> limit (in entries)
+	 *
+	 * lms_s_pr_total:
+	 * 	-2	=> disable the control
+	 * 	-1	=> no limits
+	 * 	0	=> same as soft
+	 * 	> 0	=> limit (in entries)
+	 *
+	 * lms_s_pr:
+	 * 	-1	=> no limits
+	 * 	0	=> no limits?
+	 * 	> 0	=> limit size (in entries)
+	 */
+	if ( limit.lms_s_pr_total > 0 &&
+			limit.lms_s_pr > limit.lms_s_pr_total ) {
+		limit.lms_s_pr = limit.lms_s_pr_total;
+	}
+
+	rc = limits_add( be, flags, pattern, group_oc, group_ad, &limit );
+	if ( rc ) {
+
+		Debug( LDAP_DEBUG_ANY,
+			"%s : line %d: unable to add limit in "
+			"\"limits <pattern> <limits>\" line.\n",
+		fname, lineno );
+	}
+
+	return( rc );
+}
+
+int
+limits_parse_one(
+	const char 		*arg,
+	struct slap_limits_set 	*limit
+)
+{
+	assert( arg != NULL );
+	assert( limit != NULL );
+
+	if ( STRSTART( arg, "time" ) ) {
+		arg += STRLENOF( "time" );
+
+		if ( arg[0] == '.' ) {
+			arg++;
+			if ( STRSTART( arg, "soft=" ) ) {
+				arg += STRLENOF( "soft=" );
+				if ( strcasecmp( arg, "unlimited" ) == 0
+					|| strcasecmp( arg, "none" ) == 0 )
+				{
+					limit->lms_t_soft = -1;
+
+				} else {
+					int	soft;
+
+					if ( lutil_atoi( &soft, arg ) != 0 || soft < -1 ) {
+						return( 1 );
+					}
+
+					if ( soft == -1 ) {
+						/* FIXME: use "unlimited" instead; issue warning? */
+					}
+
+					limit->lms_t_soft = soft;
+				}
+				
+			} else if ( STRSTART( arg, "hard=" ) ) {
+				arg += STRLENOF( "hard=" );
+				if ( strcasecmp( arg, "soft" ) == 0 ) {
+					limit->lms_t_hard = 0;
+
+				} else if ( strcasecmp( arg, "unlimited" ) == 0
+						|| strcasecmp( arg, "none" ) == 0 )
+				{
+					limit->lms_t_hard = -1;
+
+				} else {
+					int	hard;
+
+					if ( lutil_atoi( &hard, arg ) != 0 || hard < -1 ) {
+						return( 1 );
+					}
+
+					if ( hard == -1 ) {
+						/* FIXME: use "unlimited" instead */
+					}
+
+					if ( hard == 0 ) {
+						/* FIXME: use "soft" instead */
+					}
+
+					limit->lms_t_hard = hard;
+				}
+				
+			} else {
+				return( 1 );
+			}
+			
+		} else if ( arg[0] == '=' ) {
+			arg++;
+			if ( strcasecmp( arg, "unlimited" ) == 0
+				|| strcasecmp( arg, "none" ) == 0 )
+			{
+				limit->lms_t_soft = -1;
+
+			} else {
+				if ( lutil_atoi( &limit->lms_t_soft, arg ) != 0 
+					|| limit->lms_t_soft < -1 )
+				{
+					return( 1 );
+				}
+			}
+			limit->lms_t_hard = 0;
+			
+		} else {
+			return( 1 );
+		}
+
+	} else if ( STRSTART( arg, "size" ) ) {
+		arg += STRLENOF( "size" );
+		
+		if ( arg[0] == '.' ) {
+			arg++;
+			if ( STRSTART( arg, "soft=" ) ) {
+				arg += STRLENOF( "soft=" );
+				if ( strcasecmp( arg, "unlimited" ) == 0
+					|| strcasecmp( arg, "none" ) == 0 )
+				{
+					limit->lms_s_soft = -1;
+
+				} else {
+					int	soft;
+
+					if ( lutil_atoi( &soft, arg ) != 0 || soft < -1 ) {
+						return( 1 );
+					}
+
+					if ( soft == -1 ) {
+						/* FIXME: use "unlimited" instead */
+					}
+
+					limit->lms_s_soft = soft;
+				}
+				
+			} else if ( STRSTART( arg, "hard=" ) ) {
+				arg += STRLENOF( "hard=" );
+				if ( strcasecmp( arg, "soft" ) == 0 ) {
+					limit->lms_s_hard = 0;
+
+				} else if ( strcasecmp( arg, "unlimited" ) == 0
+						|| strcasecmp( arg, "none" ) == 0 )
+				{
+					limit->lms_s_hard = -1;
+
+				} else {
+					int	hard;
+
+					if ( lutil_atoi( &hard, arg ) != 0 || hard < -1 ) {
+						return( 1 );
+					}
+
+					if ( hard == -1 ) {
+						/* FIXME: use "unlimited" instead */
+					}
+
+					if ( hard == 0 ) {
+						/* FIXME: use "soft" instead */
+					}
+
+					limit->lms_s_hard = hard;
+				}
+				
+			} else if ( STRSTART( arg, "unchecked=" ) ) {
+				arg += STRLENOF( "unchecked=" );
+				if ( strcasecmp( arg, "unlimited" ) == 0
+					|| strcasecmp( arg, "none" ) == 0 )
+				{
+					limit->lms_s_unchecked = -1;
+
+				} else if ( strcasecmp( arg, "disabled" ) == 0 ) {
+					limit->lms_s_unchecked = 0;
+
+				} else {
+					int	unchecked;
+
+					if ( lutil_atoi( &unchecked, arg ) != 0 || unchecked < -1 ) {
+						return( 1 );
+					}
+
+					if ( unchecked == -1 ) {
+						/*  FIXME: use "unlimited" instead */
+					}
+
+					limit->lms_s_unchecked = unchecked;
+				}
+
+			} else if ( STRSTART( arg, "pr=" ) ) {
+				arg += STRLENOF( "pr=" );
+				if ( strcasecmp( arg, "noEstimate" ) == 0 ) {
+					limit->lms_s_pr_hide = 1;
+
+				} else if ( strcasecmp( arg, "unlimited" ) == 0
+						|| strcasecmp( arg, "none" ) == 0 )
+				{
+					limit->lms_s_pr = -1;
+
+				} else {
+					int	pr;
+
+					if ( lutil_atoi( &pr, arg ) != 0 || pr < -1 ) {
+						return( 1 );
+					}
+
+					if ( pr == -1 ) {
+						/* FIXME: use "unlimited" instead */
+					}
+
+					limit->lms_s_pr = pr;
+				}
+
+			} else if ( STRSTART( arg, "prtotal=" ) ) {
+				arg += STRLENOF( "prtotal=" );
+
+				if ( strcasecmp( arg, "unlimited" ) == 0
+					|| strcasecmp( arg, "none" ) == 0 )
+				{
+					limit->lms_s_pr_total = -1;
+
+				} else if ( strcasecmp( arg, "disabled" ) == 0 ) {
+					limit->lms_s_pr_total = -2;
+
+				} else if ( strcasecmp( arg, "hard" ) == 0 ) {
+					limit->lms_s_pr_total = 0;
+
+				} else {
+					int	total;
+
+					if ( lutil_atoi( &total, arg ) != 0 || total < -1 ) {
+						return( 1 );
+					}
+
+					if ( total == -1 ) {
+						/* FIXME: use "unlimited" instead */
+					}
+
+					if ( total == 0 ) {
+						/* FIXME: use "pr=disable" instead */
+					}
+
+					limit->lms_s_pr_total = total;
+				}
+
+			} else {
+				return( 1 );
+			}
+			
+		} else if ( arg[0] == '=' ) {
+			arg++;
+			if ( strcasecmp( arg, "unlimited" ) == 0
+				|| strcasecmp( arg, "none" ) == 0 )
+			{
+				limit->lms_s_soft = -1;
+
+			} else {
+				if ( lutil_atoi( &limit->lms_s_soft, arg ) != 0
+					|| limit->lms_s_soft < -1 )
+				{
+					return( 1 );
+				}
+			}
+			limit->lms_s_hard = 0;
+			
+		} else {
+			return( 1 );
+		}
+	}
+
+	return 0;
+}
+
+/* Helper macros for limits_unparse() and limits_unparse_one():
+ * Write to ptr, but not past bufEnd.  Move ptr past the new text.
+ * Return (success && enough room ? 0 : -1).
+ */
+#define ptr_APPEND_BV(bv) /* Append a \0-terminated berval */ \
+	(WHATSLEFT <= (bv).bv_len ? -1 : \
+	 ((void) (ptr = lutil_strcopy( ptr, (bv).bv_val )), 0))
+#define ptr_APPEND_LIT(str) /* Append a string literal */ \
+	(WHATSLEFT <= STRLENOF( "" str "" ) ? -1 : \
+	 ((void) (ptr = lutil_strcopy( ptr, str )), 0))
+#define ptr_APPEND_FMT(args) /* Append formatted text */ \
+	(WHATSLEFT <= (tmpLen = snprintf args) ? -1 : ((void) (ptr += tmpLen), 0))
+#define ptr_APPEND_FMT1(fmt, arg) ptr_APPEND_FMT(( ptr, WHATSLEFT, fmt, arg ))
+#define WHATSLEFT ((ber_len_t) (bufEnd - ptr))
+
+/* Caller must provide an adequately sized buffer in bv */
+int
+limits_unparse( struct slap_limits *lim, struct berval *bv, ber_len_t buflen )
+{
+	struct berval btmp;
+	char *ptr, *bufEnd;			/* Updated/used by ptr_APPEND_*()/WHATSLEFT */
+	ber_len_t tmpLen;			/* Used by ptr_APPEND_FMT*() */
+	unsigned type, style;
+	int rc = 0;
+
+	if ( !bv || !bv->bv_val ) return -1;
+
+	ptr = bv->bv_val;
+	bufEnd = ptr + buflen;
+	type = lim->lm_flags & SLAP_LIMITS_TYPE_MASK;
+
+	if ( type == SLAP_LIMITS_TYPE_GROUP ) {
+		rc = ptr_APPEND_FMT(( ptr, WHATSLEFT, "group/%s/%s=\"%s\"",
+			lim->lm_group_oc->soc_cname.bv_val,
+			lim->lm_group_ad->ad_cname.bv_val,
+			lim->lm_pat.bv_val ));
+	} else {
+		style = lim->lm_flags & SLAP_LIMITS_MASK;
+		switch( style ) {
+		case SLAP_LIMITS_ANONYMOUS:
+		case SLAP_LIMITS_USERS:
+		case SLAP_LIMITS_ANY:
+			rc = ptr_APPEND_BV( lmpats[style] );
+			break;
+		case SLAP_LIMITS_UNDEFINED:
+		case SLAP_LIMITS_EXACT:
+		case SLAP_LIMITS_ONE:
+		case SLAP_LIMITS_SUBTREE:
+		case SLAP_LIMITS_CHILDREN:
+		case SLAP_LIMITS_REGEX:
+			rc = ptr_APPEND_FMT(( ptr, WHATSLEFT, "dn.%s%s=\"%s\"",
+				type == SLAP_LIMITS_TYPE_SELF ? "" : "this.",
+				lmpats[style].bv_val, lim->lm_pat.bv_val ));
+			break;
+		}
+	}
+	if ( rc == 0 ) {
+		bv->bv_len = ptr - bv->bv_val;
+		btmp.bv_val = ptr;
+		btmp.bv_len = 0;
+		rc = limits_unparse_one( &lim->lm_limits,
+			SLAP_LIMIT_SIZE | SLAP_LIMIT_TIME,
+			&btmp, WHATSLEFT );
+		if ( rc == 0 )
+			bv->bv_len += btmp.bv_len;
+	}
+	return rc;
+}
+
+/* Caller must provide an adequately sized buffer in bv */
+int
+limits_unparse_one(
+	struct slap_limits_set	*lim,
+	int				which,
+	struct berval	*bv,
+	ber_len_t		buflen )
+{
+	char *ptr, *bufEnd;			/* Updated/used by ptr_APPEND_*()/WHATSLEFT */
+	ber_len_t tmpLen;			/* Used by ptr_APPEND_FMT*() */
+
+	if ( !bv || !bv->bv_val ) return -1;
+
+	ptr = bv->bv_val;
+	bufEnd = ptr + buflen;
+
+	if ( which & SLAP_LIMIT_SIZE ) {
+		if ( lim->lms_s_soft != SLAPD_DEFAULT_SIZELIMIT ) {
+
+			/* If same as global limit, drop it */
+			if ( lim != &frontendDB->be_def_limit &&
+				lim->lms_s_soft == frontendDB->be_def_limit.lms_s_soft )
+			{
+				goto s_hard;
+			/* If there's also a hard limit, fully qualify this one */
+			} else if ( lim->lms_s_hard ) {
+				if ( ptr_APPEND_LIT( " size.soft=" ) ) return -1;
+
+			/* If doing both size & time, qualify this */
+			} else if ( which & SLAP_LIMIT_TIME ) {
+				if ( ptr_APPEND_LIT( " size=" ) ) return -1;
+			}
+
+			if ( lim->lms_s_soft == -1
+					? ptr_APPEND_LIT( "unlimited " )
+					: ptr_APPEND_FMT1( "%d ", lim->lms_s_soft ) )
+				return -1;
+		}
+s_hard:
+		if ( lim->lms_s_hard ) {
+			if ( ptr_APPEND_LIT( " size.hard=" ) ) return -1;
+			if ( lim->lms_s_hard == -1
+					? ptr_APPEND_LIT( "unlimited " )
+					: ptr_APPEND_FMT1( "%d ", lim->lms_s_hard ) )
+				return -1;
+		}
+		if ( lim->lms_s_unchecked != -1 ) {
+			if ( ptr_APPEND_LIT( " size.unchecked=" ) ) return -1;
+			if ( lim->lms_s_unchecked == 0
+					? ptr_APPEND_LIT( "disabled " )
+					: ptr_APPEND_FMT1( "%d ", lim->lms_s_unchecked ) )
+				return -1;
+		}
+		if ( lim->lms_s_pr_hide ) {
+			if ( ptr_APPEND_LIT( " size.pr=noEstimate " ) ) return -1;
+		}
+		if ( lim->lms_s_pr ) {
+			if ( ptr_APPEND_LIT( " size.pr=" ) ) return -1;
+			if ( lim->lms_s_pr == -1
+					? ptr_APPEND_LIT( "unlimited " )
+					: ptr_APPEND_FMT1( "%d ", lim->lms_s_pr ) )
+				return -1;
+		}
+		if ( lim->lms_s_pr_total ) {
+			if ( ptr_APPEND_LIT( " size.prtotal=" ) ) return -1;
+			if ( lim->lms_s_pr_total  == -1 ? ptr_APPEND_LIT( "unlimited " )
+				: lim->lms_s_pr_total == -2 ? ptr_APPEND_LIT( "disabled " )
+				: ptr_APPEND_FMT1( "%d ", lim->lms_s_pr_total ) )
+				return -1;
+		}
+	}
+
+	if ( which & SLAP_LIMIT_TIME ) {
+		if ( lim->lms_t_soft != SLAPD_DEFAULT_TIMELIMIT ) {
+
+			/* If same as global limit, drop it */
+			if ( lim != &frontendDB->be_def_limit &&
+				lim->lms_t_soft == frontendDB->be_def_limit.lms_t_soft )
+			{
+				goto t_hard;
+
+			/* If there's also a hard limit, fully qualify this one */
+			} else if ( lim->lms_t_hard ) {
+				if ( ptr_APPEND_LIT( " time.soft=" ) ) return -1;
+
+			/* If doing both size & time, qualify this */
+			} else if ( which & SLAP_LIMIT_SIZE ) {
+				if ( ptr_APPEND_LIT( " time=" ) ) return -1;
+			}
+
+			if ( lim->lms_t_soft == -1
+					? ptr_APPEND_LIT( "unlimited " )
+					: ptr_APPEND_FMT1( "%d ", lim->lms_t_soft ) )
+				return -1;
+		}
+t_hard:
+		if ( lim->lms_t_hard ) {
+			if ( ptr_APPEND_LIT( " time.hard=" ) ) return -1;
+			if ( lim->lms_t_hard == -1
+					? ptr_APPEND_LIT( "unlimited " )
+					: ptr_APPEND_FMT1( "%d ", lim->lms_t_hard ) )
+				return -1;
+		}
+	}
+	if ( ptr != bv->bv_val ) {
+		ptr--;
+		*ptr = '\0';
+		bv->bv_len = ptr - bv->bv_val;
+	}
+
+	return 0;
+}
+
+int
+limits_check( Operation *op, SlapReply *rs )
+{
+	assert( op != NULL );
+	assert( rs != NULL );
+	/* FIXME: should this be always true? */
+	assert( op->o_tag == LDAP_REQ_SEARCH);
+
+	/* protocol only allows 0..maxInt;
+	 *
+	 * internal searches:
+	 * - may use SLAP_NO_LIMIT ( = -1 ) to indicate no limits;
+	 * - should use slimit = N and tlimit = SLAP_NO_LIMIT to
+	 *   indicate searches that should return exactly N matches,
+	 *   and handle errors thru a callback (see for instance
+	 *   slap_sasl_match() and slap_sasl2dn())
+	 */
+	if ( op->ors_tlimit == SLAP_NO_LIMIT && op->ors_slimit == SLAP_NO_LIMIT ) {
+		return 0;
+	}
+
+	/* allow root to set no limit */
+	if ( be_isroot( op ) ) {
+		op->ors_limit = NULL;
+
+		if ( op->ors_tlimit == 0 ) {
+			op->ors_tlimit = SLAP_NO_LIMIT;
+		}
+
+		if ( op->ors_slimit == 0 ) {
+			op->ors_slimit = SLAP_NO_LIMIT;
+		}
+
+		/* if paged results and slimit are requested */	
+		if ( get_pagedresults( op ) > SLAP_CONTROL_IGNORED &&
+			op->ors_slimit != SLAP_NO_LIMIT ) {
+			PagedResultsState *ps = op->o_pagedresults_state;
+			int total = op->ors_slimit - ps->ps_count;
+			if ( total > 0 ) {
+				op->ors_slimit = total;
+			} else {
+				op->ors_slimit = 0;
+			}
+		}
+
+	/* if not root, get appropriate limits */
+	} else {
+		( void ) limits_get( op, &op->ors_limit );
+
+		assert( op->ors_limit != NULL );
+
+		/* if no limit is required, use soft limit */
+		if ( op->ors_tlimit == 0 ) {
+			op->ors_tlimit = op->ors_limit->lms_t_soft;
+
+		/* limit required: check if legal */
+		} else {
+			if ( op->ors_limit->lms_t_hard == 0 ) {
+				if ( op->ors_limit->lms_t_soft > 0
+						&& ( op->ors_tlimit > op->ors_limit->lms_t_soft ) ) {
+					op->ors_tlimit = op->ors_limit->lms_t_soft;
+				}
+
+			} else if ( op->ors_limit->lms_t_hard > 0 ) {
+#ifdef ABOVE_HARD_LIMIT_IS_ERROR
+				if ( op->ors_tlimit == SLAP_MAX_LIMIT ) {
+					op->ors_tlimit = op->ors_limit->lms_t_hard;
+
+				} else if ( op->ors_tlimit > op->ors_limit->lms_t_hard ) {
+					/* error if exceeding hard limit */
+					rs->sr_err = LDAP_ADMINLIMIT_EXCEEDED;
+					send_ldap_result( op, rs );
+					rs->sr_err = LDAP_SUCCESS;
+					return -1;
+				}
+#else /* ! ABOVE_HARD_LIMIT_IS_ERROR */
+				if ( op->ors_tlimit > op->ors_limit->lms_t_hard ) {
+					op->ors_tlimit = op->ors_limit->lms_t_hard;
+				}
+#endif /* ! ABOVE_HARD_LIMIT_IS_ERROR */
+			}
+		}
+
+		/* else leave as is */
+
+		/* don't even get to backend if candidate check is disabled */
+		if ( op->ors_limit->lms_s_unchecked == 0 ) {
+			rs->sr_err = LDAP_ADMINLIMIT_EXCEEDED;
+			send_ldap_result( op, rs );
+			rs->sr_err = LDAP_SUCCESS;
+			return -1;
+		}
+
+		/* if paged results is requested */	
+		if ( get_pagedresults( op ) > SLAP_CONTROL_IGNORED ) {
+			int	slimit = -2;
+			int	pr_total;
+			PagedResultsState *ps = op->o_pagedresults_state;
+
+			/* paged results is not allowed */
+			if ( op->ors_limit->lms_s_pr_total == -2 ) {
+				rs->sr_err = LDAP_ADMINLIMIT_EXCEEDED;
+				rs->sr_text = "pagedResults control not allowed";
+				send_ldap_result( op, rs );
+				rs->sr_err = LDAP_SUCCESS;
+				rs->sr_text = NULL;
+				return -1;
+			}
+			
+			if ( op->ors_limit->lms_s_pr > 0
+				&& ps->ps_size > op->ors_limit->lms_s_pr )
+			{
+				rs->sr_err = LDAP_ADMINLIMIT_EXCEEDED;
+				rs->sr_text = "illegal pagedResults page size";
+				send_ldap_result( op, rs );
+				rs->sr_err = LDAP_SUCCESS;
+				rs->sr_text = NULL;
+				return -1;
+			}
+
+			if ( op->ors_limit->lms_s_pr_total == 0 ) {
+				if ( op->ors_limit->lms_s_hard == 0 ) {
+					pr_total = op->ors_limit->lms_s_soft;
+				} else {
+					pr_total = op->ors_limit->lms_s_hard;
+				}
+			} else {
+				pr_total = op->ors_limit->lms_s_pr_total;
+			}
+
+			if ( pr_total == -1 ) {
+				if ( op->ors_slimit == 0 || op->ors_slimit == SLAP_MAX_LIMIT ) {
+					slimit = -1;
+
+				} else {
+					slimit = op->ors_slimit - ps->ps_count;
+				}
+
+#ifdef ABOVE_HARD_LIMIT_IS_ERROR
+			} else if ( pr_total > 0 && op->ors_slimit != SLAP_MAX_LIMIT
+					&& ( op->ors_slimit == SLAP_NO_LIMIT
+						|| op->ors_slimit > pr_total ) )
+			{
+				rs->sr_err = LDAP_ADMINLIMIT_EXCEEDED;
+				send_ldap_result( op, rs );
+				rs->sr_err = LDAP_SUCCESS;
+				return -1;
+#endif /* ! ABOVE_HARD_LIMIT_IS_ERROR */
+	
+			} else {
+				/* if no limit is required, use soft limit */
+				int	total;
+				int	slimit2;
+
+				/* first round of pagedResults:
+				 * set count to any appropriate limit */
+
+				/* if the limit is set, check that it does
+				 * not violate any server-side limit */
+#ifdef ABOVE_HARD_LIMIT_IS_ERROR
+				if ( op->ors_slimit == SLAP_MAX_LIMIT )
+#else /* ! ABOVE_HARD_LIMIT_IS_ERROR */
+				if ( op->ors_slimit == SLAP_MAX_LIMIT
+					|| op->ors_slimit > pr_total )
+#endif /* ! ABOVE_HARD_LIMIT_IS_ERROR */
+				{
+					slimit2 = op->ors_slimit = pr_total;
+
+				} else if ( op->ors_slimit == 0 ) {
+					slimit2 = pr_total;
+
+				} else {
+					slimit2 = op->ors_slimit;
+				}
+
+				total = slimit2 - ps->ps_count;
+
+				if ( total >= 0 ) {
+					if ( op->ors_limit->lms_s_pr > 0 ) {
+						/* use the smallest limit set by total/per page */
+						if ( total < op->ors_limit->lms_s_pr ) {
+							slimit = total;
+	
+						} else {
+							/* use the perpage limit if any 
+							 * NOTE: + 1 because given value must be legal */
+							slimit = op->ors_limit->lms_s_pr + 1;
+						}
+
+					} else {
+						/* use the total limit if any */
+						slimit = total;
+					}
+
+				} else if ( op->ors_limit->lms_s_pr > 0 ) {
+					/* use the perpage limit if any 
+					 * NOTE: + 1 because the given value must be legal */
+					slimit = op->ors_limit->lms_s_pr + 1;
+
+				} else {
+					/* use the standard hard/soft limit if any */
+					slimit = op->ors_limit->lms_s_hard;
+				}
+			}
+		
+			/* if got any limit, use it */
+			if ( slimit != -2 ) {
+				if ( op->ors_slimit == 0 ) {
+					op->ors_slimit = slimit;
+
+				} else if ( slimit > 0 ) {
+					if ( op->ors_slimit - ps->ps_count > slimit ) {
+						rs->sr_err = LDAP_ADMINLIMIT_EXCEEDED;
+						send_ldap_result( op, rs );
+						rs->sr_err = LDAP_SUCCESS;
+						return -1;
+					}
+					op->ors_slimit = slimit;
+
+				} else if ( slimit == 0 ) {
+					op->ors_slimit = 0;
+				}
+
+			} else {
+				/* use the standard hard/soft limit if any */
+				op->ors_slimit = pr_total;
+			}
+
+		/* no limit requested: use soft, whatever it is */
+		} else if ( op->ors_slimit == 0 ) {
+			op->ors_slimit = op->ors_limit->lms_s_soft;
+
+		/* limit requested: check if legal */
+		} else {
+			/* hard limit as soft (traditional behavior) */
+			if ( op->ors_limit->lms_s_hard == 0 ) {
+				if ( op->ors_limit->lms_s_soft > 0
+						&& op->ors_slimit > op->ors_limit->lms_s_soft ) {
+					op->ors_slimit = op->ors_limit->lms_s_soft;
+				}
+
+			/* explicit hard limit: error if violated */
+			} else if ( op->ors_limit->lms_s_hard > 0 ) {
+#ifdef ABOVE_HARD_LIMIT_IS_ERROR
+				if ( op->ors_slimit == SLAP_MAX_LIMIT ) {
+					op->ors_slimit = op->ors_limit->lms_s_hard;
+
+				} else if ( op->ors_slimit > op->ors_limit->lms_s_hard ) {
+					/* if limit exceeds hard, error */
+					rs->sr_err = LDAP_ADMINLIMIT_EXCEEDED;
+					send_ldap_result( op, rs );
+					rs->sr_err = LDAP_SUCCESS;
+					return -1;
+				}
+#else /* ! ABOVE_HARD_LIMIT_IS_ERROR */
+				if ( op->ors_slimit > op->ors_limit->lms_s_hard ) {
+					op->ors_slimit = op->ors_limit->lms_s_hard;
+				}
+#endif /* ! ABOVE_HARD_LIMIT_IS_ERROR */
+			}
+		}
+
+		/* else leave as is */
+	}
+
+	return 0;
+}
+
+void
+limits_free_one( 
+	struct slap_limits	*lm )
+{
+	if ( ( lm->lm_flags & SLAP_LIMITS_MASK ) == SLAP_LIMITS_REGEX )
+		regfree( &lm->lm_regex );
+
+	if ( !BER_BVISNULL( &lm->lm_pat ) )
+		ch_free( lm->lm_pat.bv_val );
+
+	ch_free( lm );
+}
+
+void
+limits_destroy( 
+	struct slap_limits	**lm )
+{
+	int		i;
+
+	if ( lm == NULL ) {
+		return;
+	}
+
+	for ( i = 0; lm[ i ]; i++ ) {
+		limits_free_one( lm[ i ] );
+	}
+
+	ch_free( lm );
+}