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https://git.openldap.org/openldap/openldap.git
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603 lines
13 KiB
C
603 lines
13 KiB
C
/* acl.c - routines to parse and check acl's */
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/*
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* Copyright 1998-1999 The OpenLDAP Foundation, All Rights Reserved.
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* COPYING RESTRICTIONS APPLY, see COPYRIGHT file
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*/
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#include "portable.h"
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#include <stdio.h>
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#include <ac/ctype.h>
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#include <ac/regex.h>
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#include <ac/socket.h>
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#include <ac/string.h>
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#include <ac/unistd.h>
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#include "slap.h"
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static void split(char *line, int splitchar, char **left, char **right);
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static void acl_append(AccessControl **l, AccessControl *a);
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static void access_append(Access **l, Access *a);
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static void acl_usage(void) LDAP_GCCATTR((noreturn));
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#ifdef LDAP_DEBUG
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static void print_acl(AccessControl *a);
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static void print_access(Access *b);
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#endif
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static int
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regtest(const char *fname, int lineno, char *pat) {
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int e;
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regex_t re;
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char buf[512];
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unsigned size;
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char *sp;
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char *dp;
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int flag;
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sp = pat;
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dp = buf;
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size = 0;
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buf[0] = '\0';
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for (size = 0, flag = 0; (size < sizeof(buf)) && *sp; sp++) {
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if (flag) {
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if (*sp == '$'|| (*sp >= '0' && *sp <= '9')) {
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*dp++ = *sp;
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size++;
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}
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flag = 0;
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} else {
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if (*sp == '$') {
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flag = 1;
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} else {
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*dp++ = *sp;
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size++;
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}
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}
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}
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*dp = '\0';
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if ( size >= (sizeof(buf)-1) ) {
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fprintf( stderr,
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"%s: line %d: regular expression \"%s\" too large\n",
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fname, lineno, pat );
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acl_usage();
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}
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if ((e = regcomp(&re, buf, REG_EXTENDED|REG_ICASE))) {
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char error[512];
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regerror(e, &re, error, sizeof(error));
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fprintf( stderr,
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"%s: line %d: regular expression \"%s\" bad because of %s\n",
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fname, lineno, pat, error );
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acl_usage();
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return(0);
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}
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regfree(&re);
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return(1);
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}
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void
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parse_acl(
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Backend *be,
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const char *fname,
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int lineno,
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int argc,
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char **argv
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)
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{
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int i;
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char *left, *right;
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AccessControl *a;
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Access *b;
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a = NULL;
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for ( i = 1; i < argc; i++ ) {
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/* to clause - select which entries are protected */
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if ( strcasecmp( argv[i], "to" ) == 0 ) {
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if ( a != NULL ) {
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fprintf( stderr,
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"%s: line %d: only one to clause allowed in access line\n",
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fname, lineno );
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acl_usage();
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}
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a = (AccessControl *) ch_calloc( 1, sizeof(AccessControl) );
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a->acl_filter = NULL;
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a->acl_dn_pat = NULL;
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a->acl_attrs = NULL;
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a->acl_access = NULL;
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a->acl_next = NULL;
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for ( ++i; i < argc; i++ ) {
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if ( strcasecmp( argv[i], "by" ) == 0 ) {
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i--;
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break;
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}
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if ( strcasecmp( argv[i], "*" ) == 0 ) {
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a->acl_dn_pat = ch_strdup( ".*" );
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continue;
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}
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split( argv[i], '=', &left, &right );
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if ( right == NULL || *right == '\0' ) {
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fprintf( stderr,
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"%s: line %d: missing \"=\" in (or value after) \"%s\" in to clause\n",
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fname, lineno, left );
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acl_usage();
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}
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if ( strcasecmp( left, "filter" ) == 0 ) {
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if ( (a->acl_filter = str2filter(
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right )) == NULL ) {
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fprintf( stderr,
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"%s: line %d: bad filter \"%s\" in to clause\n",
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fname, lineno, right );
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acl_usage();
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}
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} else if ( strcasecmp( left, "dn" ) == 0 ) {
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a->acl_dn_pat = ch_strdup( right );
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} else if ( strncasecmp( left, "attr", 4 ) == 0 ) {
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char **alist;
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alist = str2charray( right, "," );
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charray_merge( &a->acl_attrs, alist );
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charray_free( alist );
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} else {
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fprintf( stderr,
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"%s: line %d: expecting <what> got \"%s\"\n",
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fname, lineno, left );
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acl_usage();
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}
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}
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if ( a->acl_dn_pat != NULL ) {
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int e = regcomp( &a->acl_dn_re, a->acl_dn_pat,
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REG_EXTENDED | REG_ICASE );
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if ( e ) {
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char buf[512];
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regerror( e, &a->acl_dn_re, buf, sizeof(buf) );
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fprintf( stderr,
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"%s: line %d: regular expression \"%s\" bad because of %s\n",
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fname, lineno, right, buf );
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acl_usage();
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}
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}
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/* by clause - select who has what access to entries */
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} else if ( strcasecmp( argv[i], "by" ) == 0 ) {
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if ( a == NULL ) {
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fprintf( stderr,
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"%s: line %d: to clause required before by clause in access line\n",
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fname, lineno );
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acl_usage();
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}
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/*
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* by clause consists of <who> and <access>
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*/
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b = (Access *) ch_calloc( 1, sizeof(Access) );
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if ( ++i == argc ) {
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fprintf( stderr,
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"%s: line %d: premature eol: expecting <who>\n",
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fname, lineno );
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acl_usage();
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}
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/* get <who> */
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for ( ; i < argc; i++ ) {
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char *pat;
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split( argv[i], '=', &left, &right );
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if ( strcasecmp( argv[i], "*" ) == 0 ) {
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pat = ch_strdup( ".*" );
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} else if ( strcasecmp( argv[i], "anonymous" ) == 0 ) {
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pat = ch_strdup( "anonymous" );
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} else if ( strcasecmp( argv[i], "self" ) == 0 ) {
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pat = ch_strdup( "self" );
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} else if ( strcasecmp( left, "dn" ) == 0 ) {
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regtest(fname, lineno, right);
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pat = ch_strdup( right );
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} else {
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pat = NULL;
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}
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if( pat != NULL ) {
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if( b->a_dn_pat != NULL ) {
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fprintf( stderr,
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"%s: line %d: dn pattern already specified.\n",
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fname, lineno );
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acl_usage();
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}
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b->a_dn_pat = pat;
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continue;
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}
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if ( strcasecmp( left, "dnattr" ) == 0 ) {
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if( b->a_dn_pat != NULL ) {
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fprintf( stderr,
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"%s: line %d: dnaddr already specified.\n",
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fname, lineno );
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acl_usage();
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}
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b->a_dn_at = ch_strdup( right );
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continue;
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}
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if ( strncasecmp( left, "group", sizeof("group")-1 ) == 0 ) {
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char *name = NULL;
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char *value = NULL;
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if( b->a_group_pat != NULL ) {
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fprintf( stderr,
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"%s: line %d: group pattern already specified.\n",
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fname, lineno );
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acl_usage();
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}
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/* format of string is "group/objectClassValue/groupAttrName" */
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if ((value = strchr(left, '/')) != NULL) {
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*value++ = '\0';
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if (value && *value
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&& (name = strchr(value, '/')) != NULL)
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{
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*name++ = '\0';
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}
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}
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regtest(fname, lineno, right);
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b->a_group_pat = ch_strdup( right );
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if (value && *value) {
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b->a_group_oc = ch_strdup(value);
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*--value = '/';
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} else {
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b->a_group_oc = ch_strdup("groupOfNames");
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if (name && *name) {
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b->a_group_at = ch_strdup(name);
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*--name = '/';
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} else {
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b->a_group_at = ch_strdup("member");
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}
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}
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continue;
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}
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if ( strcasecmp( left, "peername" ) == 0 ) {
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if( b->a_peername_pat != NULL ) {
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fprintf( stderr,
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"%s: line %d: peername pattern already specified.\n",
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fname, lineno );
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acl_usage();
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}
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regtest(fname, lineno, right);
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b->a_peername_pat = ch_strdup( right );
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continue;
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}
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if ( strcasecmp( left, "sockname" ) == 0 ) {
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if( b->a_sockname_pat != NULL ) {
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fprintf( stderr,
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"%s: line %d: sockname pattern already specified.\n",
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fname, lineno );
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acl_usage();
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}
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regtest(fname, lineno, right);
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b->a_sockname_pat = ch_strdup( right );
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continue;
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}
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if ( strcasecmp( left, "domain" ) == 0 ) {
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if( b->a_domain_pat != NULL ) {
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fprintf( stderr,
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"%s: line %d: domain pattern already specified.\n",
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fname, lineno );
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acl_usage();
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}
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regtest(fname, lineno, right);
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b->a_domain_pat = ch_strdup( right );
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continue;
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}
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if ( strcasecmp( left, "sockurl" ) == 0 ) {
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if( b->a_sockurl_pat != NULL ) {
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fprintf( stderr,
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"%s: line %d: sockurl pattern already specified.\n",
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fname, lineno );
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acl_usage();
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}
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regtest(fname, lineno, right);
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b->a_sockurl_pat = ch_strdup( right );
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continue;
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}
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#ifdef SLAPD_ACI_ENABLED
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if ( strcasecmp( left, "aci" ) == 0 ) {
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if( b->a_aci_at != NULL ) {
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fprintf( stderr,
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"%s: line %d: aci attribute already specified.\n",
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fname, lineno );
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acl_usage();
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}
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if ( right != NULL && *right != '\0' )
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b->a_aci_at = ch_strdup( right );
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else
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b->a_aci_at = ch_strdup( SLAPD_ACI_DEFAULT_ATTR );
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continue;
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}
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#endif
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/* get <access> */
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if ( ACL_IS_INVALID(ACL_SET(b->a_access, str2access( left ))) ) {
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fprintf( stderr,
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"%s: line %d: expecting <access> got \"%s\"\n",
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fname, lineno, left );
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acl_usage();
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}
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access_append( &a->acl_access, b );
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break;
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}
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} else {
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fprintf( stderr,
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"%s: line %d: expecting \"to\" or \"by\" got \"%s\"\n",
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fname, lineno, argv[i] );
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acl_usage();
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}
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}
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/* if we have no real access clause, complain and do nothing */
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if ( a == NULL ) {
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fprintf( stderr,
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"%s: line %d: warning: no access clause(s) specified in access line\n",
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fname, lineno );
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} else {
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#ifdef LDAP_DEBUG
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if (ldap_debug & LDAP_DEBUG_ACL)
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print_acl(a);
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#endif
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if ( a->acl_access == NULL ) {
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fprintf( stderr,
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"%s: line %d: warning: no by clause(s) specified in access line\n",
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fname, lineno );
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}
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if ( be != NULL ) {
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acl_append( &be->be_acl, a );
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} else {
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acl_append( &global_acl, a );
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}
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}
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}
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char *
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access2str( int access )
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{
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static char buf[12];
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if ( ACL_IS_SELF( access ) ) {
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strcpy( buf, "self" );
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} else {
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buf[0] = '\0';
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}
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if ( ACL_IS_NONE(access) ) {
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strcat( buf, "none" );
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} else if ( ACL_IS_AUTH(access) ) {
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strcat( buf, "auth" );
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} else if ( ACL_IS_COMPARE(access) ) {
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strcat( buf, "compare" );
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} else if ( ACL_IS_SEARCH(access) ) {
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strcat( buf, "search" );
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} else if ( ACL_IS_READ(access) ) {
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strcat( buf, "read" );
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} else if ( ACL_IS_WRITE(access) ) {
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strcat( buf, "write" );
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} else {
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strcat( buf, "unknown" );
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}
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return( buf );
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}
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int
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str2access( char *str )
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{
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int access;
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ACL_CLR(access);
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if ( strncasecmp( str, "self", 4 ) == 0 ) {
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ACL_SET_SELF(access);
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str += 4;
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}
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if ( strcasecmp( str, "none" ) == 0 ) {
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ACL_SET_NONE(access);
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} else if ( strcasecmp( str, "auth" ) == 0 ) {
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ACL_SET_AUTH(access);
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} else if ( strcasecmp( str, "compare" ) == 0 ) {
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ACL_SET_COMPARE(access);
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} else if ( strcasecmp( str, "search" ) == 0 ) {
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ACL_SET_SEARCH(access);
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} else if ( strcasecmp( str, "read" ) == 0 ) {
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ACL_SET_READ(access);
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} else if ( strcasecmp( str, "write" ) == 0 ) {
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ACL_SET_WRITE(access);
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} else {
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ACL_SET_INVALID(access);
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}
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return( access );
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}
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static void
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acl_usage( void )
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{
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fprintf( stderr, "\n"
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"<access clause> ::= access to <what> [ by <who> <access> ]+ \n"
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"<what> ::= * | [dn=<regex>] [filter=<ldapfilter>] [attrs=<attrlist>]\n"
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"<attrlist> ::= <attr> | <attr> , <attrlist>\n"
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"<attr> ::= <attrname> | entry | children\n"
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"<who> ::= [ * | anonymous | self | dn=<regex> ]\n"
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"\t[dnattr=<attrname>]\n"
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"\t[group[/<objectclass>[/<attrname>]]=<regex>]\n"
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"\t[peername=<regex>] [sockname=<regex>]\n"
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"\t[domain=<regex>] [sockurl=<regex>]\n"
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#ifdef SLAPD_ACI_ENABLED
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"\t[aci=<attrname>]\n"
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#endif
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"<access> ::= [self]{none|auth|compare|search|read|write}\n"
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);
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exit( EXIT_FAILURE );
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}
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static void
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split(
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char *line,
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int splitchar,
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char **left,
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char **right
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)
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{
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*left = line;
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if ( (*right = strchr( line, splitchar )) != NULL ) {
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*((*right)++) = '\0';
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}
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}
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static void
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access_append( Access **l, Access *a )
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{
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for ( ; *l != NULL; l = &(*l)->a_next )
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; /* NULL */
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*l = a;
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}
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static void
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acl_append( AccessControl **l, AccessControl *a )
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{
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for ( ; *l != NULL; l = &(*l)->acl_next )
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; /* NULL */
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*l = a;
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}
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#ifdef LDAP_DEBUG
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static void
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print_access( Access *b )
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{
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fprintf( stderr, "\tby" );
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if ( b->a_dn_pat != NULL ) {
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if( strcmp(b->a_dn_pat, "anonymous") == 0 ) {
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fprintf( stderr, " anonymous" );
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} else if( strcmp(b->a_dn_pat, "self") == 0 ) {
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fprintf( stderr, " self" );
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} else {
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fprintf( stderr, " dn=%s", b->a_dn_pat );
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}
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}
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if ( b->a_dn_at != NULL ) {
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fprintf( stderr, " dnattr=%s", b->a_dn_at );
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}
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if ( b->a_group_pat != NULL ) {
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fprintf( stderr, " group: %s", b->a_group_pat );
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if ( b->a_group_oc ) {
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fprintf( stderr, " objectClass: %s", b->a_group_oc );
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if ( b->a_group_at ) {
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fprintf( stderr, " attributeType: %s", b->a_group_at );
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}
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}
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}
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if ( b->a_peername_pat != NULL ) {
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fprintf( stderr, " peername=%s", b->a_peername_pat );
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}
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if ( b->a_sockname_pat != NULL ) {
|
|
fprintf( stderr, " sockname=%s", b->a_sockname_pat );
|
|
}
|
|
|
|
if ( b->a_domain_pat != NULL ) {
|
|
fprintf( stderr, " domain=%s", b->a_domain_pat );
|
|
}
|
|
|
|
if ( b->a_sockurl_pat != NULL ) {
|
|
fprintf( stderr, " sockurl=%s", b->a_sockurl_pat );
|
|
}
|
|
|
|
#ifdef SLAPD_ACI_ENABLED
|
|
if ( b->a_aci_at != NULL ) {
|
|
fprintf( stderr, " aci=%s", b->a_aci_at );
|
|
}
|
|
#endif
|
|
|
|
fprintf( stderr, "\n" );
|
|
}
|
|
|
|
static void
|
|
print_acl( AccessControl *a )
|
|
{
|
|
int i;
|
|
Access *b;
|
|
|
|
if ( a == NULL ) {
|
|
fprintf( stderr, "NULL\n" );
|
|
}
|
|
fprintf( stderr, "ACL: access to" );
|
|
if ( a->acl_filter != NULL ) {
|
|
fprintf( stderr," filter=" );
|
|
filter_print( a->acl_filter );
|
|
}
|
|
if ( a->acl_dn_pat != NULL ) {
|
|
fprintf( stderr, " dn=" );
|
|
fprintf( stderr, a->acl_dn_pat );
|
|
}
|
|
if ( a->acl_attrs != NULL ) {
|
|
int first = 1;
|
|
|
|
fprintf( stderr, "\n attrs=" );
|
|
for ( i = 0; a->acl_attrs[i] != NULL; i++ ) {
|
|
if ( ! first ) {
|
|
fprintf( stderr, "," );
|
|
}
|
|
fprintf( stderr, a->acl_attrs[i] );
|
|
first = 0;
|
|
}
|
|
}
|
|
fprintf( stderr, "\n" );
|
|
for ( b = a->acl_access; b != NULL; b = b->a_next ) {
|
|
print_access( b );
|
|
}
|
|
fprintf( stderr, "\n" );
|
|
}
|
|
|
|
#endif /* LDAP_DEBUG */
|