1 /*- 2 * Copyright (c) 1996 by 3 * Sean Eric Fagan <sef@kithrup.com> 4 * David Nugent <davidn@blaze.net.au> 5 * All rights reserved. 6 * 7 * Portions copyright (c) 1995,1997 by 8 * Berkeley Software Design, Inc. 9 * All rights reserved. 10 * 11 * Redistribution and use in source and binary forms, with or without 12 * modification, is permitted provided that the following conditions 13 * are met: 14 * 1. Redistributions of source code must retain the above copyright 15 * notice immediately at the beginning of the file, without modification, 16 * this list of conditions, and the following disclaimer. 17 * 2. Redistributions in binary form must reproduce the above copyright 18 * notice, this list of conditions and the following disclaimer in the 19 * documentation and/or other materials provided with the distribution. 20 * 3. This work was done expressly for inclusion into FreeBSD. Other use 21 * is permitted provided this notation is included. 22 * 4. Absolutely no warranty of function or purpose is made by the authors. 23 * 5. Modifications may be freely made to this file providing the above 24 * conditions are met. 25 * 26 * Low-level routines relating to the user capabilities database 27 * 28 * $FreeBSD: src/lib/libutil/login_auth.c,v 1.11 1999/08/28 00:05:45 peter Exp $ 29 * $DragonFly: src/lib/libutil/login_auth.c,v 1.3 2005/03/04 04:31:11 cpressey Exp $ 30 */ 31 32 #include <sys/types.h> 33 34 #include <fcntl.h> 35 #include <paths.h> 36 #include <stdio.h> 37 #include <stdlib.h> 38 #include <unistd.h> 39 40 #include "login_cap.h" 41 42 43 /* 44 * auth_checknologin() 45 * Checks for the existance of a nologin file in the login_cap 46 * capability <lc>. If there isn't one specified, then it checks 47 * to see if this class should just ignore nologin files. Lastly, 48 * it tries to print out the default nologin file, and, if such 49 * exists, it exits. 50 */ 51 52 void 53 auth_checknologin(login_cap_t *lc) 54 { 55 char *file; 56 57 /* Do we ignore a nologin file? */ 58 if (login_getcapbool(lc, "ignorenologin", 0)) 59 return; 60 61 /* Note that <file> will be "" if there is no nologin capability */ 62 if ((file = login_getcapstr(lc, "nologin", "", NULL)) == NULL) 63 exit(1); 64 65 /* 66 * *file is true IFF there was a "nologin" capability 67 * Note that auth_cat() returns 1 only if the specified 68 * file exists, and is readable. E.g., /.nologin exists. 69 */ 70 if ((*file && auth_cat(file)) || auth_cat(_PATH_NOLOGIN)) 71 exit(1); 72 } 73 74 75 /* 76 * auth_cat() 77 * Checks for the readability of <file>; if it can be opened for 78 * reading, it prints it out to stdout, and then exits. Otherwise, 79 * it returns 0 (meaning no nologin file). 80 */ 81 82 int 83 auth_cat(const char *file) 84 { 85 int fd, count; 86 char buf[BUFSIZ]; 87 88 if ((fd = open(file, O_RDONLY)) < 0) 89 return 0; 90 while ((count = read(fd, buf, sizeof(buf))) > 0) 91 (void)write(fileno(stdout), buf, count); 92 close(fd); 93 sleep(5); /* wait an arbitrary time to drain */ 94 return 1; 95 } 96