passwd.c revision 1.1.4.1
1 /* 2 * Copyright (c) 1987, 1993, 1994, 1995 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 #if defined(LIBC_SCCS) && !defined(lint) 35 static char rcsid[] = "$NetBSD: passwd.c,v 1.1.4.1 1996/06/02 19:48:31 ghudson Exp $"; 36 #endif /* LIBC_SCCS and not lint */ 37 38 #include <sys/types.h> 39 #include <sys/stat.h> 40 #include <sys/time.h> 41 #include <sys/resource.h> 42 #include <sys/wait.h> 43 44 #include <fcntl.h> 45 #include <unistd.h> 46 #include <stdlib.h> 47 #include <stdio.h> 48 #include <string.h> 49 #include <pwd.h> 50 #include <errno.h> 51 #include <paths.h> 52 #include <signal.h> 53 #include <limits.h> 54 #include <util.h> 55 56 static void pw_cont __P((int sig)); 57 58 int 59 pw_lock(retries) 60 int retries; 61 { 62 int i, fd; 63 mode_t old_mode; 64 65 /* Acquire the lock file. */ 66 old_mode = umask(0); 67 fd = open(_PATH_MASTERPASSWD_LOCK, O_WRONLY|O_CREAT|O_EXCL, 0600); 68 for (i = 0; i < retries && fd < 0 && errno == EEXIST; i++) { 69 sleep(1); 70 fd = open(_PATH_MASTERPASSWD_LOCK, O_WRONLY|O_CREAT|O_EXCL, 71 0600); 72 } 73 umask(old_mode); 74 return(fd); 75 } 76 77 int 78 pw_mkdb() 79 { 80 int pstat; 81 pid_t pid; 82 83 pid = vfork(); 84 if (pid == 0) { 85 execl(_PATH_PWD_MKDB, "pwd_mkdb", "-p", 86 _PATH_MASTERPASSWD_LOCK, NULL); 87 exit(1); 88 } 89 pid = waitpid(pid, &pstat, 0); 90 if (pid == -1 || !WIFEXITED(pstat) || WEXITSTATUS(pstat) != 0) 91 return(-1); 92 return(0); 93 } 94 95 int 96 pw_abort() 97 { 98 return(unlink(_PATH_MASTERPASSWD_LOCK)); 99 } 100 101 /* Everything below this point is intended for the convenience of programs 102 * which allow a user to interactively edit the passwd file. Errors in the 103 * routines below will cause the process to abort. */ 104 105 static pid_t editpid = -1; 106 107 static void 108 pw_cont(sig) 109 int sig; 110 { 111 112 if (editpid != -1) 113 kill(editpid, sig); 114 } 115 116 void 117 pw_init() 118 { 119 struct rlimit rlim; 120 121 /* Unlimited resource limits. */ 122 rlim.rlim_cur = rlim.rlim_max = RLIM_INFINITY; 123 (void)setrlimit(RLIMIT_CPU, &rlim); 124 (void)setrlimit(RLIMIT_FSIZE, &rlim); 125 (void)setrlimit(RLIMIT_STACK, &rlim); 126 (void)setrlimit(RLIMIT_DATA, &rlim); 127 (void)setrlimit(RLIMIT_RSS, &rlim); 128 129 /* Don't drop core (not really necessary, but GP's). */ 130 rlim.rlim_cur = rlim.rlim_max = 0; 131 (void)setrlimit(RLIMIT_CORE, &rlim); 132 133 /* Turn off signals. */ 134 (void)signal(SIGALRM, SIG_IGN); 135 (void)signal(SIGHUP, SIG_IGN); 136 (void)signal(SIGINT, SIG_IGN); 137 (void)signal(SIGPIPE, SIG_IGN); 138 (void)signal(SIGQUIT, SIG_IGN); 139 (void)signal(SIGTERM, SIG_IGN); 140 (void)signal(SIGCONT, pw_cont); 141 } 142 143 void 144 pw_edit(notsetuid, filename) 145 int notsetuid; 146 const char *filename; 147 { 148 int pstat; 149 char *p, *editor; 150 151 if (!filename) 152 filename = _PATH_MASTERPASSWD_LOCK; 153 if (!(editor = getenv("EDITOR"))) 154 editor = _PATH_VI; 155 if (p = strrchr(editor, '/')) 156 ++p; 157 else 158 p = editor; 159 160 if (!(editpid = vfork())) { 161 if (notsetuid) { 162 setgid(getgid()); 163 setuid(getuid()); 164 } 165 execlp(editor, p, filename, NULL); 166 _exit(1); 167 } 168 for (;;) { 169 editpid = waitpid(editpid, (int *)&pstat, WUNTRACED); 170 if (editpid == -1) 171 pw_error(editor, 1, 1); 172 else if (WIFSTOPPED(pstat)) 173 raise(WSTOPSIG(pstat)); 174 else if (WIFEXITED(pstat) && WEXITSTATUS(pstat) == 0) 175 break; 176 else 177 pw_error(editor, 1, 1); 178 } 179 editpid = -1; 180 } 181 182 void 183 pw_prompt() 184 { 185 int c; 186 187 (void)printf("re-edit the password file? [y]: "); 188 (void)fflush(stdout); 189 c = getchar(); 190 if (c != EOF && c != '\n') 191 while (getchar() != '\n'); 192 if (c == 'n') 193 pw_error(NULL, 0, 0); 194 } 195 196 void 197 pw_copy(ffd, tfd, pw) 198 int ffd, tfd; 199 struct passwd *pw; 200 { 201 FILE *from, *to; 202 int done; 203 char *p, buf[8192]; 204 205 if (!(from = fdopen(ffd, "r"))) 206 pw_error(_PATH_MASTERPASSWD, 1, 1); 207 if (!(to = fdopen(tfd, "w"))) 208 pw_error(_PATH_MASTERPASSWD_LOCK, 1, 1); 209 210 for (done = 0; fgets(buf, sizeof(buf), from);) { 211 if (!strchr(buf, '\n')) { 212 warnx("%s: line too long", _PATH_MASTERPASSWD); 213 pw_error(NULL, 0, 1); 214 } 215 if (done) { 216 (void)fprintf(to, "%s", buf); 217 if (ferror(to)) 218 goto err; 219 continue; 220 } 221 if (!(p = strchr(buf, ':'))) { 222 warnx("%s: corrupted entry", _PATH_MASTERPASSWD); 223 pw_error(NULL, 0, 1); 224 } 225 *p = '\0'; 226 if (strcmp(buf, pw->pw_name)) { 227 *p = ':'; 228 (void)fprintf(to, "%s", buf); 229 if (ferror(to)) 230 goto err; 231 continue; 232 } 233 (void)fprintf(to, "%s:%s:%d:%d:%s:%ld:%ld:%s:%s:%s\n", 234 pw->pw_name, pw->pw_passwd, pw->pw_uid, pw->pw_gid, 235 pw->pw_class, pw->pw_change, pw->pw_expire, pw->pw_gecos, 236 pw->pw_dir, pw->pw_shell); 237 done = 1; 238 if (ferror(to)) 239 goto err; 240 } 241 if (!done) 242 (void)fprintf(to, "%s:%s:%d:%d:%s:%ld:%ld:%s:%s:%s\n", 243 pw->pw_name, pw->pw_passwd, pw->pw_uid, pw->pw_gid, 244 pw->pw_class, pw->pw_change, pw->pw_expire, pw->pw_gecos, 245 pw->pw_dir, pw->pw_shell); 246 247 if (ferror(to)) 248 err: pw_error(NULL, 1, 1); 249 (void)fclose(to); 250 } 251 252 int 253 pw_scan(bp, pw, flags) 254 char *bp; 255 struct passwd *pw; 256 int *flags; 257 { 258 long id; 259 int root; 260 char *p, *sh; 261 262 if (flags != (int *)NULL) 263 *flags = 0; 264 265 if (!(pw->pw_name = strsep(&bp, ":"))) /* login */ 266 goto fmt; 267 root = !strcmp(pw->pw_name, "root"); 268 269 if (!(pw->pw_passwd = strsep(&bp, ":"))) /* passwd */ 270 goto fmt; 271 272 if (!(p = strsep(&bp, ":"))) /* uid */ 273 goto fmt; 274 id = atol(p); 275 if (root && id) { 276 warnx("root uid should be 0"); 277 return (0); 278 } 279 if (id > USHRT_MAX) { 280 warnx("%s > max uid value (%d)", p, USHRT_MAX); 281 return (0); 282 } 283 pw->pw_uid = id; 284 if ((*p == '\0') && (flags != (int *)NULL)) 285 *flags |= _PASSWORD_NOUID; 286 287 if (!(p = strsep(&bp, ":"))) /* gid */ 288 goto fmt; 289 id = atol(p); 290 if (id > USHRT_MAX) { 291 warnx("%s > max gid value (%d)", p, USHRT_MAX); 292 return (0); 293 } 294 pw->pw_gid = id; 295 if ((*p == '\0') && (flags != (int *)NULL)) 296 *flags |= _PASSWORD_NOGID; 297 298 pw->pw_class = strsep(&bp, ":"); /* class */ 299 if (!(p = strsep(&bp, ":"))) /* change */ 300 goto fmt; 301 pw->pw_change = atol(p); 302 if ((*p == '\0') && (flags != (int *)NULL)) 303 *flags |= _PASSWORD_NOCHG; 304 if (!(p = strsep(&bp, ":"))) /* expire */ 305 goto fmt; 306 pw->pw_expire = atol(p); 307 if ((*p == '\0') && (flags != (int *)NULL)) 308 *flags |= _PASSWORD_NOEXP; 309 pw->pw_gecos = strsep(&bp, ":"); /* gecos */ 310 pw->pw_dir = strsep(&bp, ":"); /* directory */ 311 if (!(pw->pw_shell = strsep(&bp, ":"))) /* shell */ 312 goto fmt; 313 314 p = pw->pw_shell; 315 if (root && *p) /* empty == /bin/sh */ 316 for (setusershell();;) { 317 if (!(sh = getusershell())) { 318 warnx("warning, unknown root shell"); 319 break; 320 } 321 if (!strcmp(p, sh)) 322 break; 323 } 324 325 if (p = strsep(&bp, ":")) { /* too many */ 326 fmt: warnx("corrupted entry"); 327 return (0); 328 } 329 330 return (1); 331 } 332 333 void 334 pw_error(name, err, eval) 335 const char *name; 336 int err, eval; 337 { 338 if (err) 339 warn(name); 340 341 warnx("%s: unchanged", _PATH_MASTERPASSWD); 342 pw_abort(); 343 exit(eval); 344 } 345 346
Indexes created Tue Sep 30 17:09:57 GMT 2025