294 lines
7.4 KiB
C
294 lines
7.4 KiB
C
/*
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* Copyright (c) 2000 - 2002, 2004 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 22119 2007-12-03 22:02:48Z lha $");
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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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free_retv(struct acl_field *acl)
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{
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while(acl != NULL) {
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if (acl->type == acl_retval) {
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if (*acl->u.retv)
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free(*acl->u.retv);
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*acl->u.retv = NULL;
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}
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acl = acl->next;
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}
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}
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static void
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acl_free_list(struct acl_field *acl, int retv)
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{
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struct acl_field *next;
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if (retv)
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free_retv(acl);
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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, 0);
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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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*tmp->u.retv = NULL;
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} else {
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krb5_set_error_string(context, "acl_parse_format: "
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"unknown format specifier %c", *p);
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acl_free_list(acl, 0);
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free(tmp);
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return EINVAL;
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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(field->u.cstr, string);
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} else if(field->type == acl_fnmatch) {
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return !fnmatch(field->u.cstr, string, 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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while(strsep_copy(&string, " \t", buf, sizeof(buf)) != -1) {
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if(buf[0] == '\0')
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continue; /* skip ws */
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if (acl == NULL)
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return FALSE;
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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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acl = acl->next;
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}
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if (acl)
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return FALSE;
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return TRUE;
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}
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/**
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* krb5_acl_match_string matches ACL format against a string.
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*
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* The ACL format has three format specifiers: s, f, and r. Each
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* specifier will retrieve one argument from the variable arguments
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* for either matching or storing data. The input string is split up
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* using " " (space) and "\t" (tab) as a delimiter; multiple and "\t"
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* in a row are considered to be the same.
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*
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* List of format specifiers:
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* - s Matches a string using strcmp(3) (case sensitive).
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* - f Matches the string with fnmatch(3). Theflags
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* argument (the last argument) passed to the fnmatch function is 0.
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* - r Returns a copy of the string in the char ** passed in; the copy
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* must be freed with free(3). There is no need to free(3) the
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* string on error: the function will clean up and set the pointer
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* to NULL.
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*
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* @param context Kerberos 5 context
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* @param string string to match with
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* @param format format to match
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* @param ... parameter to format string
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*
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* @return Return an error code or 0.
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*
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*
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* @code
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* char *s;
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*
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* ret = krb5_acl_match_string(context, "foo", "s", "foo");
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* if (ret)
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* krb5_errx(context, 1, "acl didn't match");
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* ret = krb5_acl_match_string(context, "foo foo baz/kaka",
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* "ss", "foo", &s, "foo/\\*");
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* if (ret) {
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* // no need to free(s) on error
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* assert(s == NULL);
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* krb5_errx(context, 1, "acl didn't match");
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* }
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* free(s);
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* @endcode
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*
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* @sa krb5_acl_match_file
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* @ingroup krb5_support
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*/
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krb5_error_code KRB5_LIB_FUNCTION
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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, !found);
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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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/**
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* krb5_acl_match_file matches ACL format against each line in a file
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* using krb5_acl_match_string(). Lines starting with # are treated
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* like comments and ignored.
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*
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* @param context Kerberos 5 context.
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* @param file file with acl listed in the file.
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* @param format format to match.
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* @param ... parameter to format string.
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*
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* @return Return an error code or 0.
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*
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* @sa krb5_acl_match_string
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* @ingroup krb5_support
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*/
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krb5_error_code KRB5_LIB_FUNCTION
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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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free_retv(acl);
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}
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fclose(f);
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acl_free_list(acl, !found);
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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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