1 /*- 2 * Copyright (c) 1990, 1993, 1994 3 * The Regents of the University of California. All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. All advertising materials mentioning features or use of this software 14 * must display the following acknowledgement: 15 * This product includes software developed by the University of 16 * California, Berkeley and its contributors. 17 * 4. Neither the name of the University nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 */ 33 34 #ifndef lint 35 static char sccsid[] = "@(#)pw_util.c 8.3 (Berkeley) 4/2/94"; 36 #endif /* not lint */ 37 38 /* 39 * This file is used by all the "password" programs; vipw(8), chpass(1), 40 * and passwd(1). 41 */ 42 43 #include <sys/param.h> 44 #include <sys/time.h> 45 #include <sys/resource.h> 46 #include <sys/stat.h> 47 #include <sys/wait.h> 48 49 #include <err.h> 50 #include <errno.h> 51 #include <fcntl.h> 52 #include <paths.h> 53 #include <pwd.h> 54 #include <signal.h> 55 #include <stdio.h> 56 #include <stdlib.h> 57 #include <string.h> 58 #include <unistd.h> 59 60 #include "pw_util.h" 61 62 extern char *tempname; 63 64 void 65 pw_init() 66 { 67 struct rlimit rlim; 68 69 /* Unlimited resource limits. */ 70 rlim.rlim_cur = rlim.rlim_max = RLIM_INFINITY; 71 (void)setrlimit(RLIMIT_CPU, &rlim); 72 (void)setrlimit(RLIMIT_FSIZE, &rlim); 73 (void)setrlimit(RLIMIT_STACK, &rlim); 74 (void)setrlimit(RLIMIT_DATA, &rlim); 75 (void)setrlimit(RLIMIT_RSS, &rlim); 76 77 /* Don't drop core (not really necessary, but GP's). */ 78 rlim.rlim_cur = rlim.rlim_max = 0; 79 (void)setrlimit(RLIMIT_CORE, &rlim); 80 81 /* Turn off signals. */ 82 (void)signal(SIGALRM, SIG_IGN); 83 (void)signal(SIGHUP, SIG_IGN); 84 (void)signal(SIGINT, SIG_IGN); 85 (void)signal(SIGPIPE, SIG_IGN); 86 (void)signal(SIGQUIT, SIG_IGN); 87 (void)signal(SIGTERM, SIG_IGN); 88 (void)signal(SIGTSTP, SIG_IGN); 89 (void)signal(SIGTTOU, SIG_IGN); 90 91 /* Create with exact permissions. */ 92 (void)umask(0); 93 } 94 95 static int lockfd; 96 97 int 98 pw_lock() 99 { 100 /* 101 * If the master password file doesn't exist, the system is hosed. 102 * Might as well try to build one. Set the close-on-exec bit so 103 * that users can't get at the encrypted passwords while editing. 104 * Open should allow flock'ing the file; see 4.4BSD. XXX 105 */ 106 lockfd = open(_PATH_MASTERPASSWD, O_RDONLY, 0); 107 if (lockfd < 0 || fcntl(lockfd, F_SETFD, 1) == -1) 108 err(1, "%s", _PATH_MASTERPASSWD); 109 if (flock(lockfd, LOCK_EX|LOCK_NB)) 110 errx(1, "the password db file is busy"); 111 return (lockfd); 112 } 113 114 int 115 pw_tmp() 116 { 117 static char path[MAXPATHLEN] = _PATH_MASTERPASSWD; 118 int fd; 119 char *p; 120 121 if (p = strrchr(path, '/')) 122 ++p; 123 else 124 p = path; 125 strcpy(p, "pw.XXXXXX"); 126 if ((fd = mkstemp(path)) == -1) 127 err(1, "%s", path); 128 tempname = path; 129 return (fd); 130 } 131 132 int 133 pw_mkdb() 134 { 135 int pstat; 136 pid_t pid; 137 138 warnx("rebuilding the database..."); 139 (void)fflush(stderr); 140 if (!(pid = vfork())) { 141 execl(_PATH_PWD_MKDB, "pwd_mkdb", "-p", tempname, NULL); 142 pw_error(_PATH_PWD_MKDB, 1, 1); 143 } 144 pid = waitpid(pid, &pstat, 0); 145 if (pid == -1 || !WIFEXITED(pstat) || WEXITSTATUS(pstat) != 0) 146 return (0); 147 warnx("done"); 148 return (1); 149 } 150 151 void 152 pw_edit(notsetuid) 153 int notsetuid; 154 { 155 int pstat; 156 pid_t pid; 157 char *p, *editor; 158 159 if (!(editor = getenv("EDITOR"))) 160 editor = _PATH_VI; 161 if (p = strrchr(editor, '/')) 162 ++p; 163 else 164 p = editor; 165 166 if (!(pid = vfork())) { 167 if (notsetuid) { 168 (void)setgid(getgid()); 169 (void)setuid(getuid()); 170 } 171 execlp(editor, p, tempname, NULL); 172 _exit(1); 173 } 174 pid = waitpid(pid, (int *)&pstat, 0); 175 if (pid == -1 || !WIFEXITED(pstat) || WEXITSTATUS(pstat) != 0) 176 pw_error(editor, 1, 1); 177 } 178 179 void 180 pw_prompt() 181 { 182 int c; 183 184 (void)printf("re-edit the password file? [y]: "); 185 (void)fflush(stdout); 186 c = getchar(); 187 if (c != EOF && c != '\n') 188 while (getchar() != '\n'); 189 if (c == 'n') 190 pw_error(NULL, 0, 0); 191 } 192 193 void 194 pw_error(name, err, eval) 195 char *name; 196 int err, eval; 197 { 198 if (err) 199 warn(name); 200 201 warnx("%s: unchanged", _PATH_MASTERPASSWD); 202 (void)unlink(tempname); 203 exit(eval); 204 } 205