2 * perm.c - check user permission for at(1)
4 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
6 * Copyright (C) 1994 Thomas Koenig
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. The name of the author(s) may not be used to endorse or promote
14 * products derived from this software without specific prior written
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR(S) ``AS IS'' AND ANY EXPRESS OR
18 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
19 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
20 * IN NO EVENT SHALL THE AUTHOR(S) BE LIABLE FOR ANY DIRECT, INDIRECT,
21 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
22 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24 * THEORY OF LIABILITY, WETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
29 #include <sys/cdefs.h>
30 __FBSDID("$FreeBSD$");
34 #include <sys/types.h>
54 /* Structures and unions */
56 /* Function declarations */
58 static int check_for_user(FILE *fp,const char *name);
62 static int check_for_user(FILE *fp,const char *name)
69 if ((buffer = malloc(len+2)) == NULL)
70 errx(EXIT_FAILURE, "virtual memory exhausted");
72 while(fgets(buffer, len+2, fp) != NULL)
74 if ((strncmp(name, buffer, len) == 0) &&
75 (buffer[len] == '\n'))
85 /* Global functions */
86 int check_permission(void)
89 uid_t uid = geteuid();
90 struct passwd *pentry;
95 if ((pentry = getpwuid(uid)) == NULL)
96 err(EXIT_FAILURE, "cannot access user database");
100 fp=fopen(PERM_PATH "at.allow","r");
106 return check_for_user(fp, pentry->pw_name);
108 else if (errno == ENOENT)
113 fp=fopen(PERM_PATH "at.deny", "r");
119 return !check_for_user(fp, pentry->pw_name);
121 else if (errno != ENOENT)