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 #if 0 36 static const char sccsid[] = "@(#)pw_util.c 8.3 (Berkeley) 4/2/94"; 37 #endif 38 static const char rcsid[] = 39 "$FreeBSD$"; 40 #endif /* not lint */ 41 42 /* 43 * This file is used by all the "password" programs; vipw(8), chpass(1), 44 * and passwd(1). 45 */ 46 47 #include <sys/param.h> 48 #include <sys/errno.h> 49 #include <sys/time.h> 50 #include <sys/resource.h> 51 #include <sys/stat.h> 52 #include <sys/wait.h> 53 54 #include <err.h> 55 #include <fcntl.h> 56 #include <paths.h> 57 #include <pwd.h> 58 #include <signal.h> 59 #include <stdio.h> 60 #include <stdlib.h> 61 #include <string.h> 62 #include <unistd.h> 63 64 #include "pw_util.h" 65 66 extern char *tempname; 67 static pid_t editpid = -1; 68 static int lockfd; 69 static char _default_editor[] = _PATH_VI; 70 char mppath[] = _PATH_PWD; 71 char masterpasswd[] = _PATH_MASTERPASSWD; 72 73 void pw_cont(int); 74 75 void 76 pw_cont(int sig) 77 { 78 79 if (editpid != -1) 80 kill(editpid, sig); 81 } 82 83 void 84 pw_init(void) 85 { 86 struct rlimit rlim; 87 88 /* Unlimited resource limits. */ 89 rlim.rlim_cur = rlim.rlim_max = RLIM_INFINITY; 90 (void)setrlimit(RLIMIT_CPU, &rlim); 91 (void)setrlimit(RLIMIT_FSIZE, &rlim); 92 (void)setrlimit(RLIMIT_STACK, &rlim); 93 (void)setrlimit(RLIMIT_DATA, &rlim); 94 (void)setrlimit(RLIMIT_RSS, &rlim); 95 96 /* Don't drop core (not really necessary, but GP's). */ 97 rlim.rlim_cur = rlim.rlim_max = 0; 98 (void)setrlimit(RLIMIT_CORE, &rlim); 99 100 /* Turn off signals. */ 101 (void)signal(SIGALRM, SIG_IGN); 102 (void)signal(SIGHUP, SIG_IGN); 103 (void)signal(SIGINT, SIG_IGN); 104 (void)signal(SIGPIPE, SIG_IGN); 105 (void)signal(SIGQUIT, SIG_IGN); 106 (void)signal(SIGTERM, SIG_IGN); 107 (void)signal(SIGCONT, pw_cont); 108 109 /* Create with exact permissions. */ 110 (void)umask(0); 111 } 112 113 int 114 pw_lock(void) 115 { 116 /* 117 * If the master password file doesn't exist, the system is hosed. 118 * Might as well try to build one. Set the close-on-exec bit so 119 * that users can't get at the encrypted passwords while editing. 120 * Open should allow flock'ing the file; see 4.4BSD. XXX 121 */ 122 for (;;) { 123 struct stat st; 124 125 lockfd = open(masterpasswd, O_RDONLY, 0); 126 if (lockfd < 0 || fcntl(lockfd, F_SETFD, 1) == -1) 127 err(1, "%s", masterpasswd); 128 if (flock(lockfd, LOCK_EX|LOCK_NB)) 129 errx(1, "the password db file is busy"); 130 131 /* 132 * If the password file was replaced while we were trying to 133 * get the lock, our hardlink count will be 0 and we have to 134 * close and retry. 135 */ 136 if (fstat(lockfd, &st) < 0) 137 errx(1, "fstat() failed"); 138 if (st.st_nlink != 0) 139 break; 140 close(lockfd); 141 lockfd = -1; 142 } 143 return (lockfd); 144 } 145 146 int 147 pw_tmp(void) 148 { 149 static char path[MAXPATHLEN]; 150 int fd; 151 char *p; 152 153 strncpy(path, masterpasswd, MAXPATHLEN - 1); 154 path[MAXPATHLEN] = '\0'; 155 156 if ((p = strrchr(path, '/'))) 157 ++p; 158 else 159 p = path; 160 strcpy(p, "pw.XXXXXX"); 161 if ((fd = mkstemp(path)) == -1) 162 err(1, "%s", path); 163 tempname = path; 164 return (fd); 165 } 166 167 int 168 pw_mkdb(const char *username) 169 { 170 int pstat; 171 pid_t pid; 172 173 (void)fflush(stderr); 174 if (!(pid = fork())) { 175 if(!username) { 176 warnx("rebuilding the database..."); 177 execl(_PATH_PWD_MKDB, "pwd_mkdb", "-p", "-d", mppath, 178 tempname, (char *)NULL); 179 } else { 180 warnx("updating the database..."); 181 execl(_PATH_PWD_MKDB, "pwd_mkdb", "-p", "-d", mppath, 182 "-u", username, tempname, (char *)NULL); 183 } 184 pw_error(_PATH_PWD_MKDB, 1, 1); 185 } 186 pid = waitpid(pid, &pstat, 0); 187 if (pid == -1 || !WIFEXITED(pstat) || WEXITSTATUS(pstat) != 0) 188 return (0); 189 warnx("done"); 190 return (1); 191 } 192 193 void 194 pw_edit(int notsetuid) 195 { 196 int pstat; 197 char *p, *editor; 198 199 if (!(editor = getenv("EDITOR"))) 200 editor = _default_editor; 201 if ((p = strrchr(editor, '/'))) 202 ++p; 203 else 204 p = editor; 205 206 if (!(editpid = fork())) { 207 if (notsetuid) { 208 (void)setgid(getgid()); 209 (void)setuid(getuid()); 210 } 211 errno = 0; 212 execlp(editor, p, tempname, (char *)NULL); 213 _exit(errno); 214 } 215 for (;;) { 216 editpid = waitpid(editpid, (int *)&pstat, WUNTRACED); 217 errno = WEXITSTATUS(pstat); 218 if (editpid == -1) 219 pw_error(editor, 1, 1); 220 else if (WIFSTOPPED(pstat)) 221 raise(WSTOPSIG(pstat)); 222 else if (WIFEXITED(pstat) && errno == 0) 223 break; 224 else 225 pw_error(editor, 1, 1); 226 } 227 editpid = -1; 228 } 229 230 void 231 pw_prompt(void) 232 { 233 int c, first; 234 235 (void)printf("re-edit the password file? [y]: "); 236 (void)fflush(stdout); 237 first = c = getchar(); 238 while (c != '\n' && c != EOF) 239 c = getchar(); 240 if (first == 'n') 241 pw_error(NULL, 0, 0); 242 } 243 244 void 245 pw_error(const char *name, int error, int eval) 246 { 247 #ifdef YP 248 extern int _use_yp; 249 #endif /* YP */ 250 if (error) { 251 if (name != NULL) 252 warn("%s", name); 253 else 254 warn(NULL); 255 } 256 #ifdef YP 257 if (_use_yp) 258 warnx("NIS information unchanged"); 259 else 260 #endif /* YP */ 261 warnx("%s: unchanged", masterpasswd); 262 (void)unlink(tempname); 263 exit(eval); 264 } 265