2 * $Id: afppasswd.c,v 1.6 2001-06-29 14:14:46 rufustfirefly Exp $
4 * Copyright 1999 (c) Adrian Sun (asun@u.washington.edu)
5 * All Rights Reserved. See COPYRIGHT.
7 * format of the password file:
8 * name:****************:****************:********
9 * password last login date failed usage count
11 * ***'s are illegal. they're just place holders for hex values. hex
12 * values that represent actual numbers are in network byte order.
14 * last login date is currently a 4-byte number representing seconds
15 * since 1970 (UTC). there's enough space to extend it to 8 bytes.
17 * the last two fields aren't currently used by the randnum uams.
19 * root syntax: afppasswd [-c] [-a] [-p path] [-f] [username]
20 * user syntax: afppasswd
25 #endif /* HAVE_CONFIG_H */
31 #endif /* HAVE_UNISTD_H */
34 #include <sys/types.h>
36 #include <sys/param.h>
39 #endif /* HAVE_FCNTL_H */
42 #include <netatalk/endian.h>
49 #endif /* USE_CRACKLIB */
51 #define OPT_ISROOT (1 << 0)
52 #define OPT_CREATE (1 << 1)
53 #define OPT_FORCE (1 << 2)
54 #define OPT_ADDUSER (1 << 3)
55 #define OPT_NOCRACK (1 << 4)
57 #define PASSWD_ILLEGAL '*'
59 #define FORMAT ":****************:****************:********\n"
61 #define OPTIONS "cafnu:p:"
64 #define HEXPASSWDLEN 16
67 static char buf[MAXPATHLEN + 1];
69 /* if newpwd is null, convert buf from hex to binary. if newpwd isn't
70 * null, convert newpwd to hex and save it in buf. */
71 #define unhex(x) (isdigit(x) ? (x) - '0' : toupper(x) + 10 - 'A')
72 static void convert_passwd(char *buf, char *newpwd, const int keyfd)
74 u_int8_t key[HEXPASSWDLEN];
75 Key_schedule schedule;
79 /* convert to binary */
80 for (i = j = 0; i < sizeof(key); i += 2, j++)
81 buf[j] = (unhex(buf[i]) << 4) | unhex(buf[i + 1]);
83 memset(buf + j, 0, sizeof(key) - j);
87 lseek(keyfd, 0, SEEK_SET);
88 read(keyfd, key, sizeof(key));
89 /* convert to binary */
90 for (i = j = 0; i < sizeof(key); i += 2, j++)
91 key[j] = (unhex(key[i]) << 4) | unhex(key[i + 1]);
93 memset(key + j, 0, sizeof(key) - j);
94 key_sched((C_Block *) key, schedule);
95 memset(key, 0, sizeof(key));
97 ecb_encrypt((C_Block *) newpwd, (C_Block *) newpwd, schedule,
100 /* decrypt the password */
101 ecb_encrypt((C_Block *) buf, (C_Block *) buf, schedule, DES_DECRYPT);
103 memset(schedule, 0, sizeof(schedule));
107 const unsigned char hextable[] = "0123456789ABCDEF";
110 for (i = j = 0; i < DES_KEY_SZ; i++, j += 2) {
111 buf[j] = hextable[(newpwd[i] & 0xF0) >> 4];
112 buf[j + 1] = hextable[newpwd[i] & 0x0F];
117 /* this matches the code in uam_randnum.c */
118 static int update_passwd(const char *path, const char *name, int flags)
120 char password[PASSWDLEN + 1], *p, *passwd;
123 int keyfd = -1, err = 0;
125 if ((fp = fopen(path, "r+")) == NULL) {
126 fprintf(stderr, "afppasswd: can't open %s\n", path);
130 /* open the key file if it exists */
132 if (strlen(path) < sizeof(buf) - 5) {
134 keyfd = open(buf, O_RDONLY);
138 memset(buf, 0, sizeof(buf));
139 while (fgets(buf, sizeof(buf), fp)) {
140 if ((p = strchr(buf, ':'))) {
141 /* check for a match */
142 if (strncmp(buf, name, p - buf) == 0) {
144 if (!(flags & OPT_ISROOT) && (*p == PASSWD_ILLEGAL)) {
145 fprintf(stderr, "Your password is disabled. Please see your administrator.\n");
152 memset(buf, 0, sizeof(buf));
155 if (flags & OPT_ADDUSER) {
158 p = strchr(buf, ':') + 1;
159 fwrite(buf, strlen(buf), 1, fp);
161 fprintf(stderr, "afppasswd: can't find %s in %s\n", name, path);
167 /* need to verify against old password */
168 if ((flags & OPT_ISROOT) == 0) {
169 passwd = getpass("Enter OLD AFP password: ");
170 convert_passwd(p, NULL, keyfd);
171 if (strncmp(passwd, p, PASSWDLEN)) {
172 fprintf(stderr, "afppasswd: invalid password.\n");
179 passwd = getpass("Enter NEW AFP password: ");
180 memcpy(password, passwd, sizeof(password));
181 password[PASSWDLEN] = '\0';
183 if (!(flags & OPT_NOCRACK)) {
184 if (passwd = FascistCheck(password, _PATH_CRACKLIB)) {
185 fprintf(stderr, "Error: %s\n", passwd);
190 #endif /* USE_CRACKLIB */
192 passwd = getpass("Enter NEW AFP password again: ");
193 if (strcmp(passwd, password) == 0) {
197 convert_passwd(p, password, keyfd);
198 lock.l_type = F_WRLCK;
201 lock.l_whence = SEEK_SET;
202 fseek(fp, pos, SEEK_SET);
203 fcntl(fd, F_SETLKW, &lock);
204 fwrite(buf, p - buf + HEXPASSWDLEN, 1, fp);
205 lock.l_type = F_UNLCK;
206 fcntl(fd, F_SETLK, &lock);
207 printf("afppasswd: updated password.\n");
210 fprintf(stderr, "afppasswd: passwords don't match!\n");
222 /* creates a file with all the password entries */
223 static int create_file(const char *path, uid_t minuid)
226 int fd, len, err = 0;
229 if ((fd = open(path, O_CREAT | O_TRUNC | O_RDWR, 0600)) < 0) {
230 fprintf(stderr, "afppasswd: can't create %s\n", path);
235 while ((pwd = getpwent())) {
236 if (pwd->pw_uid < minuid)
238 /* a little paranoia */
239 if (strlen(pwd->pw_name) + FORMAT_LEN > sizeof(buf) - 1)
241 strcpy(buf, pwd->pw_name);
244 if (write(fd, buf, len) != len) {
245 fprintf(stderr, "afppasswd: problem writing to %s: %m\n", path);
257 int main(int argc, char **argv)
261 uid_t uid_min = UID_START, uid;
262 char *path = _PATH_AFPDPWFILE;
266 extern int optind, opterr;
268 flags = ((uid = getuid()) == 0) ? OPT_ISROOT : 0;
270 if (((flags & OPT_ISROOT) == 0) && (argc > 1)) {
271 fprintf(stderr, "Usage: afppasswd [-acfn] [-u minuid] [-p path] [username]\n");
272 fprintf(stderr, " -a add a new user\n");
273 fprintf(stderr, " -c create and initialize password file or specific user\n");
274 fprintf(stderr, " -f force an action\n");
276 fprintf(stderr, " -n disable cracklib checking of passwords\n");
277 #endif /* USE_CRACKLIB */
278 fprintf(stderr, " -u uid minimum uid to use, defaults to 100\n");
279 fprintf(stderr, " -p path path to afppasswd file\n");
283 while ((i = getopt(argc, argv, OPTIONS)) != EOF) {
285 case 'c': /* create and initialize password file or specific user */
288 case 'a': /* add a new user */
289 flags |= OPT_ADDUSER;
291 case 'f': /* force an action */
294 case 'u': /* minimum uid to use. default is 100 */
295 uid_min = atoi(optarg);
298 case 'n': /* disable CRACKLIB check */
299 flags |= OPT_NOCRACK;
301 #endif /* USE_CRACKLIB */
302 case 'p': /* path to afppasswd file */
311 if (err || (optind + ((flags & OPT_CREATE) ? 0 :
312 (flags & OPT_ISROOT)) != argc)) {
314 fprintf(stderr, "Usage: afppasswd [-acfn] [-u minuid] [-p path] [username]\n");
315 #else /* USE_CRACKLIB */
316 fprintf(stderr, "Usage: afppasswd [-acf] [-u minuid] [-p path] [username]\n");
317 #endif /* USE_CRACKLIB */
318 fprintf(stderr, " -a add a new user\n");
319 fprintf(stderr, " -c create and initialize password file or specific user\n");
320 fprintf(stderr, " -f force an action\n");
322 fprintf(stderr, " -n disable cracklib checking of passwords\n");
323 #endif /* USE_CRACKLIB */
324 fprintf(stderr, " -u uid minimum uid to use, defaults to 100\n");
325 fprintf(stderr, " -p path path to afppasswd file\n");
330 if (flags & OPT_CREATE) {
331 if ((flags & OPT_ISROOT) == 0) {
332 fprintf(stderr, "afppasswd: only root can create the password file.\n");
336 if (!i && ((flags & OPT_FORCE) == 0)) {
337 fprintf(stderr, "afppasswd: password file already exists.\n");
340 return create_file(path, uid_min);
343 struct passwd *pwd = NULL;
346 fprintf(stderr, "afppasswd: %s doesn't exist.\n", path);
350 /* if we're root, we need to specify the username */
351 pwd = (flags & OPT_ISROOT) ? getpwnam(argv[optind]) : getpwuid(uid);
353 return update_passwd(path, pwd->pw_name, flags);
355 fprintf(stderr, "afppasswd: can't get password entry.\n");
359 #else /* UAM_RNDNUM */
361 main(int argc, char **argv)
363 fprintf(stderr, "afppasswd is only useful if you're using centralized passwords\n");
364 fprintf(stderr, "for the Random Number authentication methods.\n");
368 #endif /* UAM_RNDNUM */