206 lines
5.0 KiB
C
206 lines
5.0 KiB
C
/*
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* Copyright (c) 2000 - 2002 Kungliga Tekniska Högskolan
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* (Royal Institute of Technology, Stockholm, Sweden).
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* 3. Neither the name of the Institute nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include "krb5_locl.h"
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#include <fnmatch.h>
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RCSID("$Id: acl.c,v 1.3 2002/04/18 16:16:24 joda Exp $");
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struct acl_field {
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enum { acl_string, acl_fnmatch, acl_retval } type;
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union {
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const char *cstr;
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char **retv;
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} u;
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struct acl_field *next, **last;
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};
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static void
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acl_free_list(struct acl_field *acl)
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{
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struct acl_field *next;
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while(acl != NULL) {
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next = acl->next;
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free(acl);
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acl = next;
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}
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}
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static krb5_error_code
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acl_parse_format(krb5_context context,
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struct acl_field **acl_ret,
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const char *format,
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va_list ap)
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{
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const char *p;
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struct acl_field *acl = NULL, *tmp;
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for(p = format; *p != '\0'; p++) {
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tmp = malloc(sizeof(*tmp));
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if(tmp == NULL) {
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krb5_set_error_string(context, "malloc: out of memory");
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acl_free_list(acl);
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return ENOMEM;
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}
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if(*p == 's') {
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tmp->type = acl_string;
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tmp->u.cstr = va_arg(ap, const char*);
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} else if(*p == 'f') {
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tmp->type = acl_fnmatch;
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tmp->u.cstr = va_arg(ap, const char*);
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} else if(*p == 'r') {
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tmp->type = acl_retval;
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tmp->u.retv = va_arg(ap, char **);
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}
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tmp->next = NULL;
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if(acl == NULL)
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acl = tmp;
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else
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*acl->last = tmp;
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acl->last = &tmp->next;
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}
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*acl_ret = acl;
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return 0;
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}
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static krb5_boolean
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acl_match_field(krb5_context context,
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const char *string,
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struct acl_field *field)
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{
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if(field->type == acl_string) {
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return !strcmp(string, field->u.cstr);
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} else if(field->type == acl_fnmatch) {
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return !fnmatch(string, field->u.cstr, 0);
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} else if(field->type == acl_retval) {
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*field->u.retv = strdup(string);
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return TRUE;
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}
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return FALSE;
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}
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static krb5_boolean
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acl_match_acl(krb5_context context,
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struct acl_field *acl,
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const char *string)
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{
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char buf[256];
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for(;strsep_copy(&string, " \t", buf, sizeof(buf)) != -1;
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acl = acl->next) {
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if(buf[0] == '\0')
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continue; /* skip ws */
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if(!acl_match_field(context, buf, acl)) {
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return FALSE;
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}
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}
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return TRUE;
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}
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krb5_error_code
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krb5_acl_match_string(krb5_context context,
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const char *string,
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const char *format,
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...)
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{
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krb5_error_code ret;
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krb5_boolean found;
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struct acl_field *acl;
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va_list ap;
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va_start(ap, format);
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ret = acl_parse_format(context, &acl, format, ap);
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va_end(ap);
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if(ret)
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return ret;
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found = acl_match_acl(context, acl, string);
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acl_free_list(acl);
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if (found) {
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return 0;
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} else {
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krb5_set_error_string(context, "ACL did not match");
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return EACCES;
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}
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}
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krb5_error_code
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krb5_acl_match_file(krb5_context context,
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const char *file,
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const char *format,
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...)
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{
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krb5_error_code ret;
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struct acl_field *acl;
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char buf[256];
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va_list ap;
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FILE *f;
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krb5_boolean found;
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f = fopen(file, "r");
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if(f == NULL) {
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int save_errno = errno;
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krb5_set_error_string(context, "open(%s): %s", file,
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strerror(save_errno));
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return save_errno;
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}
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va_start(ap, format);
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ret = acl_parse_format(context, &acl, format, ap);
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va_end(ap);
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if(ret) {
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fclose(f);
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return ret;
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}
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found = FALSE;
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while(fgets(buf, sizeof(buf), f)) {
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if(buf[0] == '#')
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continue;
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if(acl_match_acl(context, acl, buf)) {
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found = TRUE;
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break;
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}
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}
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fclose(f);
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acl_free_list(acl);
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if (found) {
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return 0;
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} else {
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krb5_set_error_string(context, "ACL did not match");
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return EACCES;
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}
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}
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