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https://git.openldap.org/openldap/openldap.git
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475 lines
11 KiB
C
475 lines
11 KiB
C
/* acl.c - routines to parse and check acl's */
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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(struct acl **l, struct acl *a);
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static void access_append(struct access **l, struct access *a);
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static void acl_usage(void);
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#ifdef LDAP_DEBUG
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static void print_acl(struct acl *a);
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static void print_access(struct access *b);
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#endif
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static int
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regtest(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, 0 );
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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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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 *e, *left, *right;
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struct acl *a;
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struct 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 = (struct acl *) ch_calloc( 1, sizeof(struct acl) );
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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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int e;
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if ((e = regcomp( &a->acl_dnre, ".*",
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REG_EXTENDED|REG_ICASE)))
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{
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char buf[512];
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regerror(e, &a->acl_dnre, 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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a->acl_dnpat = 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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int e;
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if ((e = regcomp(&a->acl_dnre, right,
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REG_EXTENDED|REG_ICASE))) {
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char buf[512];
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regerror(e, &a->acl_dnre, 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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} else {
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a->acl_dnpat = dn_upcase(ch_strdup( right ));
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}
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} else if ( strncasecmp( left, "attr", 4 )
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== 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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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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/* 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 = (struct access *) ch_calloc( 1,
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sizeof(struct 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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split( argv[i], '=', &left, &right );
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if ( strcasecmp( argv[i], "*" ) == 0 ) {
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b->a_dnpat = ch_strdup( ".*" );
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} else if ( strcasecmp( argv[i], "self" ) == 0 ) {
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b->a_dnpat = 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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b->a_dnpat = dn_upcase( ch_strdup( right ) );
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} else if ( strcasecmp( left, "dnattr" ) == 0 ) {
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b->a_dnattr = ch_strdup( right );
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#ifdef SLAPD_ACLGROUPS
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} else if ( strcasecmp( left, "group" ) == 0 ) {
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char *name = NULL;
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char *value = NULL;
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regtest(fname, lineno, right);
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/* format of string is "group/objectClassValue/groupAttrName"
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*/
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if ((value = strchr(right, '/')) != NULL) {
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*value++ = '\0';
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if (value && *value && (name = strchr(value, '/')) != NULL)
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*name++ = '\0';
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}
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b->a_group = dn_upcase(ch_strdup( right ));
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if (value && *value) {
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b->a_objectclassvalue = ch_strdup(value);
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*--value = '/';
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}
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else
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b->a_objectclassvalue = ch_strdup("groupOfNames");
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if (name && *name) {
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b->a_groupattrname = ch_strdup(name);
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*--name = '/';
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}
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else
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b->a_groupattrname = ch_strdup("member");
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#endif /* SLAPD_ACLGROUPS */
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} else if ( strcasecmp( left, "domain" ) == 0 ) {
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char *s;
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regtest(fname, lineno, right);
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b->a_domainpat = ch_strdup( right );
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/* normalize the domain */
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for ( s = b->a_domainpat; *s; s++ ) {
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*s = TOLOWER( *s );
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}
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} else if ( strcasecmp( left, "addr" ) == 0 ) {
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regtest(fname, lineno, right);
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b->a_addrpat = ch_strdup( right );
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} else {
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fprintf( stderr,
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"%s: line %d: expecting <who> got \"%s\"\n",
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fname, lineno, left );
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acl_usage();
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}
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if ( ++i == argc ) {
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fprintf( stderr,
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"%s: line %d: premature eol: expecting <access>\n",
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fname, lineno );
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acl_usage();
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}
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/* get <access> */
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split( argv[i], '=', &left, &right );
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if ( (b->a_access = str2access( left )) == -1 ) {
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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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} 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 ( access & ACL_SELF ) {
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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 ( access & ACL_NONE ) {
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strcat( buf, "none" );
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} else if ( access & ACL_COMPARE ) {
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strcat( buf, "compare" );
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} else if ( access & ACL_SEARCH ) {
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strcat( buf, "search" );
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} else if ( access & ACL_READ ) {
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strcat( buf, "read" );
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} else if ( access & ACL_WRITE ) {
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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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access = 0;
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if ( strncasecmp( str, "self", 4 ) == 0 ) {
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access |= ACL_SELF;
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str += 4;
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}
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if ( strcasecmp( str, "none" ) == 0 ) {
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access |= ACL_NONE;
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} else if ( strcasecmp( str, "compare" ) == 0 ) {
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access |= ACL_COMPARE;
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} else if ( strcasecmp( str, "search" ) == 0 ) {
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access |= ACL_SEARCH;
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} else if ( strcasecmp( str, "read" ) == 0 ) {
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access |= ACL_READ;
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} else if ( strcasecmp( str, "write" ) == 0 ) {
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access |= ACL_WRITE;
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} else {
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access = -1;
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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<access clause> ::= access to <what> [ by <who> <access> ]+ \n" );
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fprintf( stderr, "<what> ::= * | [dn=<regex>] [filter=<ldapfilter>] [attrs=<attrlist>]\n" );
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fprintf( stderr, "<attrlist> ::= <attr> | <attr> , <attrlist>\n" );
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fprintf( stderr, "<attr> ::= <attrname> | entry | children\n" );
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fprintf( stderr, "<who> ::= * | self | dn=<regex> | addr=<regex> |\n\tdomain=<regex> | dnattr=<dnattrname>\n" );
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fprintf( stderr, "<access> ::= [self]{none | compare | search | read | write }\n" );
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exit( 1 );
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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( struct access **l, struct 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( struct acl **l, struct acl *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( struct access *b )
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{
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printf( "\tby" );
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if ( b->a_dnpat != NULL ) {
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fprintf( stderr, " dn=%s", b->a_dnpat );
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} else if ( b->a_addrpat != NULL ) {
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fprintf( stderr, " addr=%s", b->a_addrpat );
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} else if ( b->a_domainpat != NULL ) {
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fprintf( stderr, " domain=%s", b->a_domainpat );
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} else if ( b->a_dnattr != NULL ) {
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fprintf( stderr, " dnattr=%s", b->a_dnattr );
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}
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#ifdef SLAPD_ACLGROUPS
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else if ( b->a_group != NULL ) {
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fprintf( stderr, " group: %s", b->a_group );
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if ( b->a_objectclassvalue )
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fprintf( stderr, " objectClassValue: %s", b->a_objectclassvalue );
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if ( b->a_groupattrname )
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fprintf( stderr, " groupAttrName: %s", b->a_groupattrname );
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}
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#endif
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fprintf( stderr, "\n" );
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}
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static void
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print_acl( struct acl *a )
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{
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int i;
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struct access *b;
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if ( a == NULL ) {
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fprintf( stderr, "NULL\n" );
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}
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fprintf( stderr, "ACL: access to" );
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if ( a->acl_filter != NULL ) {
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fprintf( stderr," filter=" );
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filter_print( a->acl_filter );
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}
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if ( a->acl_dnpat != NULL ) {
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fprintf( stderr, " dn=" );
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fprintf( stderr, a->acl_dnpat );
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}
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if ( a->acl_attrs != NULL ) {
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int first = 1;
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fprintf( stderr, "\n attrs=" );
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for ( i = 0; a->acl_attrs[i] != NULL; i++ ) {
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if ( ! first ) {
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fprintf( stderr, "," );
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}
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fprintf( stderr, a->acl_attrs[i] );
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first = 0;
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}
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}
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fprintf( stderr, "\n" );
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for ( b = a->acl_access; b != NULL; b = b->a_next ) {
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print_access( b );
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}
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fprintf( stderr, "\n" );
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}
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#endif /* LDAP_DEBUG */
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