passwd.c revision 1.6
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 1.6 1997/05/22 03:08:42 lukem 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 <ctype.h> 45 #include <err.h> 46 #include <fcntl.h> 47 #include <unistd.h> 48 #include <stdlib.h> 49 #include <stdio.h> 50 #include <string.h> 51 #include <pwd.h> 52 #include <errno.h> 53 #include <paths.h> 54 #include <signal.h> 55 #include <limits.h> 56 #include <util.h> 57 58 static void pw_cont __P((int sig)); 59 60 int 61 pw_lock(retries) 62 int retries; 63 { 64 int i, fd; 65 mode_t old_mode; 66 67 /* Acquire the lock file. */ 68 old_mode = umask(0); 69 fd = open(_PATH_MASTERPASSWD_LOCK, O_WRONLY|O_CREAT|O_EXCL, 0600); 70 for (i = 0; i < retries && fd < 0 && errno == EEXIST; i++) { 71 sleep(1); 72 fd = open(_PATH_MASTERPASSWD_LOCK, O_WRONLY|O_CREAT|O_EXCL, 73 0600); 74 } 75 umask(old_mode); 76 return(fd); 77 } 78 79 int 80 pw_mkdb() 81 { 82 int pstat; 83 pid_t pid; 84 85 pid = vfork(); 86 if (pid == 0) { 87 execl(_PATH_PWD_MKDB, "pwd_mkdb", "-p", 88 _PATH_MASTERPASSWD_LOCK, NULL); 89 exit(1); 90 } 91 pid = waitpid(pid, &pstat, 0); 92 if (pid == -1 || !WIFEXITED(pstat) || WEXITSTATUS(pstat) != 0) 93 return(-1); 94 return(0); 95 } 96 97 int 98 pw_abort() 99 { 100 return(unlink(_PATH_MASTERPASSWD_LOCK)); 101 } 102 103 /* Everything below this point is intended for the convenience of programs 104 * which allow a user to interactively edit the passwd file. Errors in the 105 * routines below will cause the process to abort. */ 106 107 static pid_t editpid = -1; 108 109 static void 110 pw_cont(sig) 111 int sig; 112 { 113 114 if (editpid != -1) 115 kill(editpid, sig); 116 } 117 118 void 119 pw_init() 120 { 121 struct rlimit rlim; 122 123 /* Unlimited resource limits. */ 124 rlim.rlim_cur = rlim.rlim_max = RLIM_INFINITY; 125 (void)setrlimit(RLIMIT_CPU, &rlim); 126 (void)setrlimit(RLIMIT_FSIZE, &rlim); 127 (void)setrlimit(RLIMIT_STACK, &rlim); 128 (void)setrlimit(RLIMIT_DATA, &rlim); 129 (void)setrlimit(RLIMIT_RSS, &rlim); 130 131 /* Don't drop core (not really necessary, but GP's). */ 132 rlim.rlim_cur = rlim.rlim_max = 0; 133 (void)setrlimit(RLIMIT_CORE, &rlim); 134 135 /* Turn off signals. */ 136 (void)signal(SIGALRM, SIG_IGN); 137 (void)signal(SIGHUP, SIG_IGN); 138 (void)signal(SIGINT, SIG_IGN); 139 (void)signal(SIGPIPE, SIG_IGN); 140 (void)signal(SIGQUIT, SIG_IGN); 141 (void)signal(SIGTERM, SIG_IGN); 142 (void)signal(SIGCONT, pw_cont); 143 } 144 145 void 146 pw_edit(notsetuid, filename) 147 int notsetuid; 148 const char *filename; 149 { 150 int i, j, xargc, pstat; 151 char *p, *editor; 152 char **xargv; 153 154 if (filename == NULL) 155 filename = _PATH_MASTERPASSWD_LOCK; 156 if ((editor = getenv("EDITOR")) == NULL) 157 editor = strdup(_PATH_VI); 158 else 159 editor = strdup(editor); 160 if (p = strrchr(editor, '/')) 161 ++p; 162 else 163 p = editor; 164 165 /* Scan editor string, count spaces, allocate arg vector. */ 166 for (i = 0, xargc = 0; p[i] != '\0'; i++) { 167 if (isspace(p[i])) { 168 while (isspace(p[i++])) 169 /* skip white space */ ; 170 if (p[i] == '\0') 171 break; 172 xargc++; 173 } 174 } 175 176 /* argv[0] + <xargc args> + filename + NULL */ 177 xargv = (char **)malloc(sizeof(char *) * (xargc + 3)); 178 if (xargv == NULL) 179 pw_error("malloc failed", 1, 1); 180 181 i = 0; 182 xargv[i++] = p; 183 for (; *p != '\0'; p++) { 184 if (isspace(*p)) { 185 while(isspace(*p)) 186 *p++ = '\0'; /* blast whitespace */ 187 if (*p == '\0') 188 break; 189 xargv[i++] = p; 190 } 191 } 192 193 xargv[i++] = (char *)filename; 194 xargv[i] = NULL; 195 196 if (!(editpid = vfork())) { 197 if (notsetuid) { 198 setgid(getgid()); 199 setuid(getuid()); 200 } 201 execvp(editor, xargv); 202 _exit(1); 203 } 204 for (;;) { 205 editpid = waitpid(editpid, (int *)&pstat, WUNTRACED); 206 if (editpid == -1) 207 pw_error(editor, 1, 1); 208 else if (WIFSTOPPED(pstat)) 209 raise(WSTOPSIG(pstat)); 210 else if (WIFEXITED(pstat) && WEXITSTATUS(pstat) == 0) 211 break; 212 else 213 pw_error(editor, 1, 1); 214 } 215 editpid = -1; 216 free(editor); 217 free(xargv); 218 } 219 220 void 221 pw_prompt() 222 { 223 int c; 224 225 (void)printf("re-edit the password file? [y]: "); 226 (void)fflush(stdout); 227 c = getchar(); 228 if (c != EOF && c != '\n') 229 while (getchar() != '\n'); 230 if (c == 'n') 231 pw_error(NULL, 0, 0); 232 } 233 234 void 235 pw_copy(ffd, tfd, pw) 236 int ffd, tfd; 237 struct passwd *pw; 238 { 239 FILE *from, *to; 240 int done; 241 char *p, buf[8192]; 242 243 if (!(from = fdopen(ffd, "r"))) 244 pw_error(_PATH_MASTERPASSWD, 1, 1); 245 if (!(to = fdopen(tfd, "w"))) 246 pw_error(_PATH_MASTERPASSWD_LOCK, 1, 1); 247 248 for (done = 0; fgets(buf, sizeof(buf), from);) { 249 if (!strchr(buf, '\n')) { 250 warnx("%s: line too long", _PATH_MASTERPASSWD); 251 pw_error(NULL, 0, 1); 252 } 253 if (done) { 254 (void)fprintf(to, "%s", buf); 255 if (ferror(to)) 256 goto err; 257 continue; 258 } 259 if (!(p = strchr(buf, ':'))) { 260 warnx("%s: corrupted entry", _PATH_MASTERPASSWD); 261 pw_error(NULL, 0, 1); 262 } 263 *p = '\0'; 264 if (strcmp(buf, pw->pw_name)) { 265 *p = ':'; 266 (void)fprintf(to, "%s", buf); 267 if (ferror(to)) 268 goto err; 269 continue; 270 } 271 (void)fprintf(to, "%s:%s:%d:%d:%s:%ld:%ld:%s:%s:%s\n", 272 pw->pw_name, pw->pw_passwd, pw->pw_uid, pw->pw_gid, 273 pw->pw_class, pw->pw_change, pw->pw_expire, pw->pw_gecos, 274 pw->pw_dir, pw->pw_shell); 275 done = 1; 276 if (ferror(to)) 277 goto err; 278 } 279 if (!done) 280 (void)fprintf(to, "%s:%s:%d:%d:%s:%ld:%ld:%s:%s:%s\n", 281 pw->pw_name, pw->pw_passwd, pw->pw_uid, pw->pw_gid, 282 pw->pw_class, pw->pw_change, pw->pw_expire, pw->pw_gecos, 283 pw->pw_dir, pw->pw_shell); 284 285 if (ferror(to)) 286 err: pw_error(NULL, 1, 1); 287 (void)fclose(to); 288 } 289 290 int 291 pw_scan(bp, pw, flags) 292 char *bp; 293 struct passwd *pw; 294 int *flags; 295 { 296 unsigned long id; 297 int root; 298 char *p, *sh, *ep; 299 300 if (flags != (int *)NULL) 301 *flags = 0; 302 303 if (!(pw->pw_name = strsep(&bp, ":"))) /* login */ 304 goto fmt; 305 root = !strcmp(pw->pw_name, "root"); 306 307 if (!(pw->pw_passwd = strsep(&bp, ":"))) /* passwd */ 308 goto fmt; 309 310 if (!(p = strsep(&bp, ":"))) /* uid */ 311 goto fmt; 312 id = strtoul(p, &ep, 10); 313 if (root && id) { 314 warnx("root uid should be 0"); 315 return (0); 316 } 317 if (id > UID_MAX || *ep != '\0') { 318 warnx("invalid uid '%s'", p); 319 return (0); 320 } 321 pw->pw_uid = (uid_t)id; 322 if ((*p == '\0') && (flags != (int *)NULL)) 323 *flags |= _PASSWORD_NOUID; 324 325 if (!(p = strsep(&bp, ":"))) /* gid */ 326 goto fmt; 327 id = strtoul(p, &ep, 10); 328 if (id > GID_MAX || *ep != '\0') { 329 warnx("invalid gid '%s'", p); 330 return (0); 331 } 332 pw->pw_gid = (gid_t)id; 333 if ((*p == '\0') && (flags != (int *)NULL)) 334 *flags |= _PASSWORD_NOGID; 335 336 pw->pw_class = strsep(&bp, ":"); /* class */ 337 if (!(p = strsep(&bp, ":"))) /* change */ 338 goto fmt; 339 pw->pw_change = atol(p); 340 if ((*p == '\0') && (flags != (int *)NULL)) 341 *flags |= _PASSWORD_NOCHG; 342 if (!(p = strsep(&bp, ":"))) /* expire */ 343 goto fmt; 344 pw->pw_expire = atol(p); 345 if ((*p == '\0') && (flags != (int *)NULL)) 346 *flags |= _PASSWORD_NOEXP; 347 pw->pw_gecos = strsep(&bp, ":"); /* gecos */ 348 pw->pw_dir = strsep(&bp, ":"); /* directory */ 349 if (!(pw->pw_shell = strsep(&bp, ":"))) /* shell */ 350 goto fmt; 351 352 p = pw->pw_shell; 353 if (root && *p) /* empty == /bin/sh */ 354 for (setusershell();;) { 355 if (!(sh = getusershell())) { 356 warnx("warning, unknown root shell"); 357 break; 358 } 359 if (!strcmp(p, sh)) 360 break; 361 } 362 363 if (p = strsep(&bp, ":")) { /* too many */ 364 fmt: warnx("corrupted entry"); 365 return (0); 366 } 367 368 return (1); 369 } 370 371 void 372 pw_error(name, err, eval) 373 const char *name; 374 int err, eval; 375 { 376 if (err) 377 warn(name); 378 379 warnx("%s: unchanged", _PATH_MASTERPASSWD); 380 pw_abort(); 381 exit(eval); 382 } 383 384
Indexes created Tue Sep 23 07:09:52 GMT 2025