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 static pid_t editpid = -1; 64 static int lockfd; 65 66 void 67 pw_cont(sig) 68 int sig; 69 { 70 71 if (editpid != -1) 72 kill(editpid, sig); 73 } 74 75 void 76 pw_init() 77 { 78 struct rlimit rlim; 79 80 /* Unlimited resource limits. */ 81 rlim.rlim_cur = rlim.rlim_max = RLIM_INFINITY; 82 (void)setrlimit(RLIMIT_CPU, &rlim); 83 (void)setrlimit(RLIMIT_FSIZE, &rlim); 84 (void)setrlimit(RLIMIT_STACK, &rlim); 85 (void)setrlimit(RLIMIT_DATA, &rlim); 86 (void)setrlimit(RLIMIT_RSS, &rlim); 87 88 /* Don't drop core (not really necessary, but GP's). */ 89 rlim.rlim_cur = rlim.rlim_max = 0; 90 (void)setrlimit(RLIMIT_CORE, &rlim); 91 92 /* Turn off signals. */ 93 (void)signal(SIGALRM, SIG_IGN); 94 (void)signal(SIGHUP, SIG_IGN); 95 (void)signal(SIGINT, SIG_IGN); 96 (void)signal(SIGPIPE, SIG_IGN); 97 (void)signal(SIGQUIT, SIG_IGN); 98 (void)signal(SIGTERM, SIG_IGN); 99 (void)signal(SIGCONT, pw_cont); 100 101 /* Create with exact permissions. */ 102 (void)umask(0); 103 } 104 105 int 106 pw_lock() 107 { 108 /* 109 * If the master password file doesn't exist, the system is hosed. 110 * Might as well try to build one. Set the close-on-exec bit so 111 * that users can't get at the encrypted passwords while editing. 112 * Open should allow flock'ing the file; see 4.4BSD. XXX 113 */ 114 lockfd = open(_PATH_MASTERPASSWD, O_RDONLY, 0); 115 if (lockfd < 0 || fcntl(lockfd, F_SETFD, 1) == -1) 116 err(1, "%s", _PATH_MASTERPASSWD); 117 if (flock(lockfd, LOCK_EX|LOCK_NB)) 118 errx(1, "the password db file is busy"); 119 return (lockfd); 120 } 121 122 int 123 pw_tmp() 124 { 125 static char path[MAXPATHLEN] = _PATH_MASTERPASSWD; 126 int fd; 127 char *p; 128 129 if (p = strrchr(path, '/')) 130 ++p; 131 else 132 p = path; 133 strcpy(p, "pw.XXXXXX"); 134 if ((fd = mkstemp(path)) == -1) 135 err(1, "%s", path); 136 tempname = path; 137 return (fd); 138 } 139 140 int 141 pw_mkdb() 142 { 143 int pstat; 144 pid_t pid; 145 146 warnx("rebuilding the database..."); 147 (void)fflush(stderr); 148 if (!(pid = vfork())) { 149 execl(_PATH_PWD_MKDB, "pwd_mkdb", "-p", tempname, NULL); 150 pw_error(_PATH_PWD_MKDB, 1, 1); 151 } 152 pid = waitpid(pid, &pstat, 0); 153 if (pid == -1 || !WIFEXITED(pstat) || WEXITSTATUS(pstat) != 0) 154 return (0); 155 warnx("done"); 156 return (1); 157 } 158 159 void 160 pw_edit(notsetuid) 161 int notsetuid; 162 { 163 int pstat; 164 char *p, *editor; 165 166 if (!(editor = getenv("EDITOR"))) 167 editor = _PATH_VI; 168 if (p = strrchr(editor, '/')) 169 ++p; 170 else 171 p = editor; 172 173 if (!(editpid = vfork())) { 174 if (notsetuid) { 175 (void)setgid(getgid()); 176 (void)setuid(getuid()); 177 } 178 execlp(editor, p, tempname, NULL); 179 _exit(1); 180 } 181 for (;;) { 182 editpid = waitpid(editpid, (int *)&pstat, WUNTRACED); 183 if (editpid == -1) 184 pw_error(editor, 1, 1); 185 else if (WIFSTOPPED(pstat)) 186 raise(WSTOPSIG(pstat)); 187 else if (WIFEXITED(pstat) && WEXITSTATUS(pstat) == 0) 188 break; 189 else 190 pw_error(editor, 1, 1); 191 } 192 editpid = -1; 193 } 194 195 void 196 pw_prompt() 197 { 198 int c; 199 200 (void)printf("re-edit the password file? [y]: "); 201 (void)fflush(stdout); 202 c = getchar(); 203 if (c != EOF && c != '\n') 204 while (getchar() != '\n'); 205 if (c == 'n') 206 pw_error(NULL, 0, 0); 207 } 208 209 void 210 pw_error(name, err, eval) 211 char *name; 212 int err, eval; 213 { 214 #ifdef YP 215 extern int _use_yp; 216 #endif /* YP */ 217 if (err) 218 warn(name); 219 #ifdef YP 220 if (_use_yp) 221 warnx("NIS information unchanged"); 222 else 223 #endif /* YP */ 224 warnx("%s: unchanged", _PATH_MASTERPASSWD); 225 (void)unlink(tempname); 226 exit(eval); 227 } 228