perm.c revision 80294
110154Sache/* 27767Sache * perm.c - check user permission for at(1) 37767Sache * Copyright (C) 1994 Thomas Koenig 47767Sache * 57767Sache * Redistribution and use in source and binary forms, with or without 67767Sache * modification, are permitted provided that the following conditions 77767Sache * are met: 87767Sache * 1. Redistributions of source code must retain the above copyright 97767Sache * notice, this list of conditions and the following disclaimer. 107767Sache * 2. The name of the author(s) may not be used to endorse or promote 117767Sache * products derived from this software without specific prior written 127767Sache * permission. 137767Sache * 147767Sache * THIS SOFTWARE IS PROVIDED BY THE AUTHOR(S) ``AS IS'' AND ANY EXPRESS OR 157767Sache * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 167767Sache * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 1710154Sache * IN NO EVENT SHALL THE AUTHOR(S) BE LIABLE FOR ANY DIRECT, INDIRECT, 187767Sache * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 197767Sache * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 207767Sache * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 217767Sache * THEORY OF LIABILITY, WETHER IN CONTRACT, STRICT LIABILITY, OR TORT 227767Sache * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 237767Sache * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 247767Sache */ 257767Sache 2654158Scharnier#ifndef lint 2754158Scharnierstatic const char rcsid[] = 2854158Scharnier "$FreeBSD: head/usr.bin/at/perm.c 80294 2001-07-24 14:15:51Z obrien $"; 2954158Scharnier#endif /* not lint */ 3054158Scharnier 317767Sache/* System Headers */ 327767Sache 337767Sache#include <sys/types.h> 3454158Scharnier#include <err.h> 357767Sache#include <errno.h> 367767Sache#include <pwd.h> 377767Sache#include <stddef.h> 387767Sache#include <stdio.h> 397767Sache#include <stdlib.h> 407767Sache#include <string.h> 417767Sache#include <unistd.h> 427767Sache 437767Sache/* Local headers */ 447767Sache 457767Sache#include "privs.h" 467767Sache#include "at.h" 477767Sache 487767Sache/* Macros */ 497767Sache 507767Sache#define MAXUSERID 10 517767Sache 527767Sache/* Structures and unions */ 537767Sache 547767Sache/* Function declarations */ 557767Sache 567767Sachestatic int check_for_user(FILE *fp,const char *name); 577767Sache 587767Sache/* Local functions */ 597767Sache 607767Sachestatic int check_for_user(FILE *fp,const char *name) 617767Sache{ 627767Sache char *buffer; 637767Sache size_t len; 647767Sache int found = 0; 657767Sache 667767Sache len = strlen(name); 6780294Sobrien if ((buffer = malloc(len+2)) == NULL) 6880294Sobrien errx(EXIT_FAILURE, "virtual memory exhausted"); 697767Sache 707767Sache while(fgets(buffer, len+2, fp) != NULL) 717767Sache { 727767Sache if ((strncmp(name, buffer, len) == 0) && 737767Sache (buffer[len] == '\n')) 747767Sache { 757767Sache found = 1; 767767Sache break; 777767Sache } 787767Sache } 797767Sache fclose(fp); 807767Sache free(buffer); 817767Sache return found; 827767Sache} 837767Sache/* Global functions */ 847767Sacheint check_permission() 857767Sache{ 867767Sache FILE *fp; 877767Sache uid_t uid = geteuid(); 887767Sache struct passwd *pentry; 897767Sache 907767Sache if (uid==0) 917767Sache return 1; 927767Sache 937767Sache if ((pentry = getpwuid(uid)) == NULL) 9454158Scharnier err(EXIT_FAILURE, "cannot access user database"); 957767Sache 967767Sache PRIV_START 977767Sache 987767Sache fp=fopen(PERM_PATH "at.allow","r"); 997767Sache 1007767Sache PRIV_END 1017767Sache 1027767Sache if (fp != NULL) 1037767Sache { 1047767Sache return check_for_user(fp, pentry->pw_name); 1057767Sache } 10648386Sbillf else if (errno == ENOENT) 1077767Sache { 1087767Sache 1097767Sache PRIV_START 1107767Sache 1117767Sache fp=fopen(PERM_PATH "at.deny", "r"); 1127767Sache 1137767Sache PRIV_END 1147767Sache 1157767Sache if (fp != NULL) 1167767Sache { 1177767Sache return !check_for_user(fp, pentry->pw_name); 1187767Sache } 11948386Sbillf else if (errno != ENOENT) 12054158Scharnier warn("at.deny"); 1217767Sache } 12248386Sbillf else 12354158Scharnier warn("at.allow"); 1247767Sache return 0; 1257767Sache} 126