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Diffstat (limited to 'servers/slapd/limits.c')
| -rw-r--r-- | servers/slapd/limits.c | 1355 |
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..5812517 --- /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 1998-2021 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 ), 0 ); + 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%s", + 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, 0 ); + } + + } 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, 0 ); + } + + } 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, 0 ); + 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, 0 ); + } + + 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 ); +} |