123 lines
2.8 KiB
C
123 lines
2.8 KiB
C
/* $NetBSD: perm.c,v 1.2 2000/10/04 19:24:59 mjl Exp $ */
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/*
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* perm.c - check user permission for at(1)
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* Copyright (C) 1994 Thomas Koenig
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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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* 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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* 2. The name of the author(s) may not be used to endorse or promote
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* products derived from this software without specific prior written
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* permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR(S) ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR(S) BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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/* System Headers */
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#include <sys/types.h>
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#include <errno.h>
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#include <pwd.h>
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#include <stddef.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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/* Local headers */
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#include "at.h"
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#include "panic.h"
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#include "pathnames.h"
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#include "privs.h"
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#include "perm.h"
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/* File scope variables */
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#ifndef lint
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#if 0
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static char rcsid[] = "$OpenBSD: perm.c,v 1.1 1997/03/01 23:40:12 millert Exp $";
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#else
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__RCSID("$NetBSD: perm.c,v 1.2 2000/10/04 19:24:59 mjl Exp $");
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#endif
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#endif
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/* Function declarations */
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static int check_for_user (FILE *, const char *);
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/* Local functions */
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static int
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check_for_user(FILE *fp, const char *name)
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{
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char *buffer;
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size_t len;
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int found = 0;
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len = strlen(name);
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if ((buffer = malloc(len + 2)) == NULL)
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panic("Insufficient virtual memory");
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while (fgets(buffer, len + 2, fp) != NULL) {
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if (strncmp(name, buffer, len) == 0 && buffer[len] == '\n') {
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found = 1;
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break;
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}
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}
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(void)fclose(fp);
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free(buffer);
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return (found);
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}
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/* Global functions */
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int
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check_permission(void)
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{
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FILE *fp;
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uid_t uid = geteuid();
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struct passwd *pentry;
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if (uid==0)
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return 1;
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if ((pentry = getpwuid(uid)) == NULL) {
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perror("Cannot access user database");
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exit(EXIT_FAILURE);
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}
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PRIV_START
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fp = fopen(_PATH_AT_ALLOW, "r");
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PRIV_END
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if (fp != NULL) {
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return (check_for_user(fp, pentry->pw_name));
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} else {
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PRIV_START
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fp = fopen(_PATH_AT_DENY, "r");
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PRIV_END
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if (fp != NULL)
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return (!check_for_user(fp, pentry->pw_name));
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}
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return (0);
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}
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