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openldap/servers/slapd/limits.c
Pierangelo Masarati 960b5f8656 add sanity checks
2004-03-09 14:45:10 +00:00

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/* limits.c - routines to handle regex-based size and time limits */
/* $OpenLDAP$ */
/* This work is part of OpenLDAP Software <http://www.openldap.org/>.
*
* Copyright 1998-2004 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/regex.h>
#include <ac/string.h>
#include "slap.h"
int
limits_get(
Operation *op,
struct berval *ndn,
struct slap_limits_set **limit
)
{
struct slap_limits **lm;
assert( op );
assert( limit );
/*
* 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;
switch ( style ) {
case SLAP_LIMITS_EXACT:
if ( ndn->bv_len == 0 ) {
break;
}
if ( type == SLAP_LIMITS_TYPE_GROUP ) {
int rc;
rc = backend_group( op, NULL,
&lm[0]->lm_pat, ndn,
lm[0]->lm_group_oc,
lm[0]->lm_group_ad );
if ( rc == 0 ) {
*limit = &lm[0]->lm_limits;
return( 0 );
}
}
if ( dn_match( &lm[0]->lm_pat, ndn ) ) {
*limit = &lm[0]->lm_limits;
return( 0 );
}
break;
case SLAP_LIMITS_ONE:
case SLAP_LIMITS_SUBTREE:
case SLAP_LIMITS_CHILDREN: {
size_t d;
if ( ndn->bv_len == 0 ) {
break;
}
/* ndn shorter than dn_pat */
if ( ndn->bv_len < lm[0]->lm_pat.bv_len ) {
break;
}
d = ndn->bv_len - lm[0]->lm_pat.bv_len;
/* allow exact match for SUBTREE only */
if ( d == 0 ) {
if ( style != SLAP_LIMITS_SUBTREE ) {
break;
}
} else {
/* check for unescaped rdn separator */
if ( !DN_SEPARATOR( ndn->bv_val[d-1] ) ) {
break;
}
}
/* in case of (sub)match ... */
if ( lm[0]->lm_pat.bv_len == ( ndn->bv_len - d )
&& strcmp( lm[0]->lm_pat.bv_val,
&ndn->bv_val[d] ) == 0 )
{
/* check for exactly one rdn in case of ONE */
if ( style == SLAP_LIMITS_ONE ) {
/*
* if ndn is more that one rdn
* below dn_pat, continue
*/
if ( (size_t) dn_rdnlen( NULL, ndn )
!= d - 1 )
{
break;
}
}
*limit = &lm[0]->lm_limits;
return( 0 );
}
break;
}
case SLAP_LIMITS_REGEX:
if ( ndn->bv_len == 0 ) {
break;
}
if ( regexec( &lm[0]->lm_regex, ndn->bv_val,
0, NULL, 0 ) == 0 )
{
*limit = &lm[0]->lm_limits;
return( 0 );
}
break;
case SLAP_LIMITS_ANONYMOUS:
if ( ndn->bv_len == 0 ) {
*limit = &lm[0]->lm_limits;
return( 0 );
}
break;
case SLAP_LIMITS_USERS:
if ( ndn->bv_len != 0 ) {
*limit = &lm[0]->lm_limits;
return( 0 );
}
break;
case SLAP_LIMITS_ANY:
*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 );
assert( limit );
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 ( 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:
lm->lm_flags = style | type;
{
int rc;
struct berval bv;
bv.bv_val = (char *) pattern;
bv.bv_len = strlen( pattern );
rc = dnNormalize( 0, NULL, NULL, &bv, &lm->lm_pat, NULL );
if ( rc != LDAP_SUCCESS ) {
ch_free( lm );
return( -1 );
}
}
break;
case SLAP_LIMITS_REGEX:
lm->lm_flags = style | type;
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:
lm->lm_flags = style | type;
lm->lm_pat.bv_val = NULL;
lm->lm_pat.bv_len = 0;
break;
}
switch ( type ) {
case SLAP_LIMITS_TYPE_GROUP:
assert( group_oc );
assert( group_ad );
lm->lm_group_oc = group_oc;
lm->lm_group_ad = group_ad;
break;
}
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 );
}
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 );
if ( argc < 3 ) {
#ifdef NEW_LOGGING
LDAP_LOG( CONFIG, CRIT,
"%s : line %d: missing arg(s) in "
"\"limits <pattern> <limits>\" line.\n", fname, lineno, 0 );
#else
Debug( LDAP_DEBUG_ANY,
"%s : line %d: missing arg(s) in "
"\"limits <pattern> <limits>\" line.\n%s",
fname, lineno, "" );
#endif
return( -1 );
}
limit = be->be_def_limit;
/*
* syntax:
*
* "limits" <pattern> <limit> [ ... ]
*
*
* <pattern>:
*
* "anonymous"
* "users"
* [ "dn" [ "." { "exact" | "base" | "onelevel" | "subtree" | children"
* | "regex" | "anonymous" } ] "=" ] <dn pattern>
*
* Note:
* "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 ( strncasecmp( pattern, "dn", sizeof( "dn" ) - 1 ) == 0 ) {
pattern += sizeof( "dn" ) - 1;
if ( pattern[0] == '.' ) {
pattern++;
if ( strncasecmp( pattern, "exact", sizeof( "exact" ) - 1 ) == 0 ) {
flags = SLAP_LIMITS_EXACT;
pattern += sizeof( "exact" ) - 1;
} else if ( strncasecmp( pattern, "base", sizeof( "base" ) - 1 ) == 0 ) {
flags = SLAP_LIMITS_BASE;
pattern += sizeof( "base" ) - 1;
} else if ( strncasecmp( pattern, "one", sizeof( "one" ) - 1 ) == 0 ) {
flags = SLAP_LIMITS_ONE;
pattern += sizeof( "one" ) - 1;
if ( strncasecmp( pattern, "level", sizeof( "level" ) - 1 ) == 0 ) {
pattern += sizeof( "level" ) - 1;
} else {
#ifdef NEW_LOGGING
LDAP_LOG( CONFIG, WARNING ,
"%s : line %d: deprecated \"one\" style "
"\"limits <pattern> <limits>\" line; "
"use \"onelevel\" instead.\n", fname, lineno, 0 );
#else
Debug( LDAP_DEBUG_ANY,
"%s : line %d: deprecated \"one\" style "
"\"limits <pattern> <limits>\" line; "
"use \"onelevel\" instead.\n", fname, lineno, 0 );
#endif
}
} else if ( strncasecmp( pattern, "sub", sizeof( "sub" ) - 1 ) == 0 ) {
flags = SLAP_LIMITS_SUBTREE;
pattern += sizeof( "sub" ) - 1;
if ( strncasecmp( pattern, "tree", sizeof( "tree" ) - 1 ) == 0 ) {
pattern += sizeof( "tree" ) - 1;
} else {
#ifdef NEW_LOGGING
LDAP_LOG( CONFIG, WARNING ,
"%s : line %d: deprecated \"sub\" style "
"\"limits <pattern> <limits>\" line; "
"use \"subtree\" instead.\n", fname, lineno, 0 );
#else
Debug( LDAP_DEBUG_ANY,
"%s : line %d: deprecated \"sub\" style "
"\"limits <pattern> <limits>\" line; "
"use \"subtree\" instead.\n", fname, lineno, 0 );
#endif
}
} else if ( strncasecmp( pattern, "children", sizeof( "children" ) - 1 ) == 0 ) {
flags = SLAP_LIMITS_CHILDREN;
pattern += sizeof( "children" ) - 1;
} else if ( strncasecmp( pattern, "regex", sizeof( "regex" ) - 1 ) == 0 ) {
flags = SLAP_LIMITS_REGEX;
pattern += sizeof( "regex" ) - 1;
/*
* this could be deprecated in favour
* of the pattern = "anonymous" form
*/
} else if ( strncasecmp( pattern, "anonymous", sizeof( "anonymous" ) - 1 ) == 0 ) {
flags = SLAP_LIMITS_ANONYMOUS;
pattern = NULL;
}
}
/* pre-check the data */
switch ( flags ) {
case SLAP_LIMITS_ANONYMOUS:
case SLAP_LIMITS_USERS:
/* no need for pattern */
pattern = NULL;
break;
default:
if ( pattern[0] != '=' ) {
#ifdef NEW_LOGGING
LDAP_LOG( CONFIG, CRIT,
"%s : line %d: missing '=' in "
"\"dn[.{exact|base|onelevel|subtree"
"|children|regex|anonymous}]" "=<pattern>\" in "
"\"limits <pattern> <limits>\" line.\n", fname, lineno, 0 );
#else
Debug( LDAP_DEBUG_ANY,
"%s : line %d: missing '=' in "
"\"dn[.{exact|base|onelevel|subtree"
"|children|regex|anonymous}]"
"=<pattern>\" in "
"\"limits <pattern> <limits>\" "
"line.\n%s",
fname, lineno, "" );
#endif
return( -1 );
}
/* skip '=' (required) */
pattern++;
/* trim obvious cases */
if ( strcmp( pattern, "*" ) == 0 ) {
flags = SLAP_LIMITS_ANY;
pattern = NULL;
} else if ( flags == SLAP_LIMITS_REGEX
&& strcmp( pattern, ".*" ) == 0 ) {
flags = SLAP_LIMITS_ANY;
pattern = NULL;
}
}
} else if (strncasecmp( pattern, "group", sizeof( "group" ) - 1 ) == 0 ) {
pattern += sizeof( "group" ) - 1;
if ( pattern[0] == '/' ) {
struct berval oc, ad;
oc.bv_val = pattern + 1;
ad.bv_val = strchr(pattern, '/');
if ( ad.bv_val != NULL ) {
const char *text = NULL;
int rc;
oc.bv_len = ad.bv_val - oc.bv_val;
ad.bv_val++;
ad.bv_len = strlen( ad.bv_val );
rc = slap_bv2ad( &ad, &group_ad, &text );
if ( rc != LDAP_SUCCESS ) {
goto no_ad;
}
pattern = ad.bv_val + ad.bv_len;
} else {
oc.bv_len = strlen( oc.bv_val );
pattern = oc.bv_val + oc.bv_len;
}
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;
int rc;
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] != '=' ) {
#ifdef NEW_LOGGING
LDAP_LOG( CONFIG, CRIT,
"%s : line %d: missing '=' in "
"\"group[/objectClass[/attributeType]]"
"=<pattern>\" in "
"\"limits <pattern> <limits>\" line.\n",
fname, lineno, 0 );
#else
Debug( LDAP_DEBUG_ANY,
"%s : line %d: missing '=' in "
"\"group[/objectClass[/attributeType]]"
"=<pattern>\" in "
"\"limits <pattern> <limits>\" line.\n",
fname, lineno, 0 );
#endif
return( -1 );
}
/* skip '=' (required) */
pattern++;
}
/* get the limits */
for ( i = 2; i < argc; i++ ) {
if ( limits_parse_one( argv[i], &limit ) ) {
#ifdef NEW_LOGGING
LDAP_LOG( CONFIG, CRIT,
"%s : line %d: unknown limit values \"%s\" in "
"\"limits <pattern> <limits>\" line.\n",
fname, lineno, argv[i] );
#else
Debug( LDAP_DEBUG_ANY,
"%s : line %d: unknown limit values \"%s\" in "
"\"limits <pattern> <limits>\" line.\n",
fname, lineno, argv[i] );
#endif
return( 1 );
}
}
/*
* sanity checks ...
*/
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;
}
rc = limits_add( be, flags, pattern, group_oc, group_ad, &limit );
if ( rc ) {
#ifdef NEW_LOGGING
LDAP_LOG( CONFIG, CRIT,
"%s : line %d: unable to add limit in "
"\"limits <pattern> <limits>\" line.\n",
fname, lineno, 0 );
#else
Debug( LDAP_DEBUG_ANY,
"%s : line %d: unable to add limit in "
"\"limits <pattern> <limits>\" line.\n",
fname, lineno, 0 );
#endif
}
return( rc );
}
int
limits_parse_one(
const char *arg,
struct slap_limits_set *limit
)
{
assert( arg );
assert( limit );
if ( strncasecmp( arg, "time", sizeof( "time" ) - 1 ) == 0 ) {
arg += 4;
if ( arg[0] == '.' ) {
arg++;
if ( strncasecmp( arg, "soft", sizeof( "soft" ) - 1 ) == 0 ) {
arg += 4;
if ( arg[0] != '=' ) {
return( 1 );
}
arg++;
if ( strcasecmp( arg, "none" ) == 0 ) {
limit->lms_t_soft = -1;
} else {
char *next = NULL;
limit->lms_t_soft =
strtol( arg, &next, 10 );
if ( next == arg || limit->lms_t_soft < -1 ) {
return( 1 );
}
}
} else if ( strncasecmp( arg, "hard", sizeof( "hard" ) - 1 ) == 0 ) {
arg += 4;
if ( arg[0] != '=' ) {
return( 1 );
}
arg++;
if ( strcasecmp( arg, "soft" ) == 0 ) {
limit->lms_t_hard = 0;
} else if ( strcasecmp( arg, "none" ) == 0 ) {
limit->lms_t_hard = -1;
} else {
char *next = NULL;
limit->lms_t_hard =
strtol( arg, &next, 10 );
if ( next == arg || limit->lms_t_hard < -1 ) {
return( 1 );
}
}
} else {
return( 1 );
}
} else if ( arg[0] == '=' ) {
arg++;
if ( strcasecmp( arg, "none" ) == 0 ) {
limit->lms_t_soft = -1;
} else {
char *next = NULL;
limit->lms_t_soft = strtol( arg, &next, 10 );
if ( next == arg || limit->lms_t_soft < -1 ) {
return( 1 );
}
}
limit->lms_t_hard = 0;
} else {
return( 1 );
}
} else if ( strncasecmp( arg, "size", sizeof( "size" ) - 1 ) == 0 ) {
arg += 4;
if ( arg[0] == '.' ) {
arg++;
if ( strncasecmp( arg, "soft", sizeof( "soft" ) - 1 ) == 0 ) {
arg += 4;
if ( arg[0] != '=' ) {
return( 1 );
}
arg++;
if ( strcasecmp( arg, "none" ) == 0 ) {
limit->lms_s_soft = -1;
} else {
char *next = NULL;
limit->lms_s_soft =
strtol( arg, &next, 10 );
if ( next == arg || limit->lms_s_soft < -1 ) {
return( 1 );
}
}
} else if ( strncasecmp( arg, "hard", sizeof( "hard" ) - 1 ) == 0 ) {
arg += 4;
if ( arg[0] != '=' ) {
return( 1 );
}
arg++;
if ( strcasecmp( arg, "soft" ) == 0 ) {
limit->lms_s_hard = 0;
} else if ( strcasecmp( arg, "none" ) == 0 ) {
limit->lms_s_hard = -1;
} else {
char *next = NULL;
limit->lms_s_hard =
strtol( arg, &next, 10 );
if ( next == arg || limit->lms_s_hard < -1 ) {
return( 1 );
}
}
} else if ( strncasecmp( arg, "unchecked", sizeof( "unchecked" ) - 1 ) == 0 ) {
arg += 9;
if ( arg[0] != '=' ) {
return( 1 );
}
arg++;
if ( strcasecmp( arg, "none" ) == 0 ) {
limit->lms_s_unchecked = -1;
} else {
char *next = NULL;
limit->lms_s_unchecked =
strtol( arg, &next, 10 );
if ( next == arg || limit->lms_s_unchecked < -1 ) {
return( 1 );
}
}
} else if ( strncasecmp( arg, "pr", sizeof( "pr" ) - 1 ) == 0 ) {
arg += sizeof( "pr" ) - 1;
if ( arg[0] != '=' ) {
return( 1 );
}
arg++;
if ( strcasecmp( arg, "noEstimate" ) == 0 ) {
limit->lms_s_pr_hide = 1;
} else {
char *next = NULL;
limit->lms_s_pr =
strtol( arg, &next, 10 );
if ( next == arg || limit->lms_s_pr < -1 ) {
return( 1 );
}
}
} else {
return( 1 );
}
} else if ( arg[0] == '=' ) {
arg++;
if ( strcasecmp( arg, "none" ) == 0 ) {
limit->lms_s_soft = -1;
} else {
char *next = NULL;
limit->lms_s_soft = strtol( arg, &next, 10 );
if ( next == arg || limit->lms_s_soft < -1 ) {
return( 1 );
}
}
limit->lms_s_hard = 0;
} else {
return( 1 );
}
}
return 0;
}
int
limits_check( Operation *op, SlapReply *rs )
{
assert( op );
assert( rs );
/* FIXME: should this be always true? */
assert( op->o_tag == LDAP_REQ_SEARCH);
/* allow root to set no limit */
if ( be_isroot( op->o_bd, &op->o_ndn ) ) {
op->ors_limit = NULL;
if ( op->ors_tlimit == 0 ) {
op->ors_tlimit = -1;
}
if ( op->ors_slimit == 0 ) {
op->ors_slimit = -1;
}
/* if not root, get appropriate limits */
} else {
( void ) limits_get( op, &op->o_ndn, &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;
/* if requested limit higher than hard limit, abort */
} else if ( op->ors_tlimit > op->ors_limit->lms_t_hard ) {
/* no hard limit means use soft instead */
if ( op->ors_limit->lms_t_hard == 0
&& op->ors_limit->lms_t_soft > -1
&& op->ors_tlimit > op->ors_limit->lms_t_soft ) {
op->ors_tlimit = op->ors_limit->lms_t_soft;
/* positive hard limit means abort */
} else if ( op->ors_limit->lms_t_hard > 0 ) {
rs->sr_err = LDAP_ADMINLIMIT_EXCEEDED;
send_ldap_result( op, rs );
rs->sr_err = LDAP_SUCCESS;
return -1;
}
/* negative hard limit means no limit */
}
/* if no limit is required, use soft limit */
if ( op->ors_slimit <= 0 ) {
if ( get_pagedresults( op ) && op->ors_limit->lms_s_pr != 0 ) {
op->ors_slimit = op->ors_limit->lms_s_pr;
} else {
op->ors_slimit = op->ors_limit->lms_s_soft;
}
/* if requested limit higher than hard limit, abort */
} else if ( op->ors_slimit > op->ors_limit->lms_s_hard ) {
/* no hard limit means use soft instead */
if ( op->ors_limit->lms_s_hard == 0
&& op->ors_limit->lms_s_soft > -1
&& op->ors_slimit > op->ors_limit->lms_s_soft ) {
op->ors_slimit = op->ors_limit->lms_s_soft;
/* positive hard limit means abort */
} else if ( op->ors_limit->lms_s_hard > 0 ) {
rs->sr_err = LDAP_ADMINLIMIT_EXCEEDED;
send_ldap_result( op, rs );
rs->sr_err = LDAP_SUCCESS;
return -1;
}
/* negative hard limit means no limit */
}
}
return 0;
}
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