2 * $Id: afppasswd.c,v 1.19 2005-04-28 20:49:19 bfernhomberg 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 */
33 #include <sys/types.h>
35 #include <sys/param.h>
38 #include <arpa/inet.h>
44 #endif /* USE_CRACKLIB */
46 #define OPT_ISROOT (1 << 0)
47 #define OPT_CREATE (1 << 1)
48 #define OPT_FORCE (1 << 2)
49 #define OPT_ADDUSER (1 << 3)
50 #define OPT_NOCRACK (1 << 4)
52 #define PASSWD_ILLEGAL '*'
54 #define FORMAT ":****************:****************:********\n"
56 #define OPTIONS "cafnu:p:"
59 #define HEXPASSWDLEN 16
62 static char buf[MAXPATHLEN + 1];
64 /* if newpwd is null, convert buf from hex to binary. if newpwd isn't
65 * null, convert newpwd to hex and save it in buf. */
66 #define unhex(x) (isdigit(x) ? (x) - '0' : toupper(x) + 10 - 'A')
67 static void convert_passwd(char *buf, char *newpwd, const int keyfd)
69 u_int8_t key[HEXPASSWDLEN];
70 Key_schedule schedule;
74 /* convert to binary */
75 for (i = j = 0; i < sizeof(key); i += 2, j++)
76 buf[j] = (unhex(buf[i]) << 4) | unhex(buf[i + 1]);
78 memset(buf + j, 0, sizeof(key) - j);
82 lseek(keyfd, 0, SEEK_SET);
83 read(keyfd, key, sizeof(key));
84 /* convert to binary */
85 for (i = j = 0; i < sizeof(key); i += 2, j++)
86 key[j] = (unhex(key[i]) << 4) | unhex(key[i + 1]);
88 memset(key + j, 0, sizeof(key) - j);
89 key_sched((C_Block *) key, schedule);
90 memset(key, 0, sizeof(key));
92 ecb_encrypt((C_Block *) newpwd, (C_Block *) newpwd, schedule,
95 /* decrypt the password */
96 ecb_encrypt((C_Block *) buf, (C_Block *) buf, schedule, DES_DECRYPT);
98 memset(&schedule, 0, sizeof(schedule));
102 const unsigned char hextable[] = "0123456789ABCDEF";
105 for (i = j = 0; i < DES_KEY_SZ; i++, j += 2) {
106 buf[j] = hextable[(newpwd[i] & 0xF0) >> 4];
107 buf[j + 1] = hextable[newpwd[i] & 0x0F];
112 /* this matches the code in uam_randnum.c */
113 static int update_passwd(const char *path, const char *name, int flags)
115 char password[PASSWDLEN + 1], *p, *passwd;
118 int keyfd = -1, err = 0;
120 if ((fp = fopen(path, "r+")) == NULL) {
121 fprintf(stderr, "afppasswd: can't open %s\n", path);
125 /* open the key file if it exists */
127 if (strlen(path) < sizeof(buf) - 5) {
129 keyfd = open(buf, O_RDONLY);
133 memset(buf, 0, sizeof(buf));
134 while (fgets(buf, sizeof(buf), fp)) {
135 if ((p = strchr(buf, ':'))) {
136 /* check for a match */
137 if (strlen(name) == (p - buf) &&
138 strncmp(buf, name, p - buf) == 0) {
140 if (!(flags & OPT_ISROOT) && (*p == PASSWD_ILLEGAL)) {
141 fprintf(stderr, "Your password is disabled. Please see your administrator.\n");
148 memset(buf, 0, sizeof(buf));
151 if (flags & OPT_ADDUSER) {
154 p = strchr(buf, ':') + 1;
155 fwrite(buf, strlen(buf), 1, fp);
157 fprintf(stderr, "afppasswd: can't find %s in %s\n", name, path);
163 /* need to verify against old password */
164 if ((flags & OPT_ISROOT) == 0) {
165 passwd = getpass("Enter OLD AFP password: ");
166 convert_passwd(p, NULL, keyfd);
167 if (strncmp(passwd, p, PASSWDLEN)) {
168 fprintf(stderr, "afppasswd: invalid password.\n");
175 passwd = getpass("Enter NEW AFP password: ");
176 memcpy(password, passwd, sizeof(password));
177 password[PASSWDLEN] = '\0';
179 if (!(flags & OPT_NOCRACK)) {
180 if (passwd = FascistCheck(password, _PATH_CRACKLIB)) {
181 fprintf(stderr, "Error: %s\n", passwd);
186 #endif /* USE_CRACKLIB */
188 passwd = getpass("Enter NEW AFP password again: ");
189 if (strcmp(passwd, password) == 0) {
193 convert_passwd(p, password, keyfd);
194 lock.l_type = F_WRLCK;
197 lock.l_whence = SEEK_SET;
198 fseek(fp, pos, SEEK_SET);
199 fcntl(fd, F_SETLKW, &lock);
200 fwrite(buf, p - buf + HEXPASSWDLEN, 1, fp);
201 lock.l_type = F_UNLCK;
202 fcntl(fd, F_SETLK, &lock);
203 printf("afppasswd: updated password.\n");
206 fprintf(stderr, "afppasswd: passwords don't match!\n");
218 /* creates a file with all the password entries */
219 static int create_file(const char *path, uid_t minuid)
222 int fd, len, err = 0;
225 if ((fd = open(path, O_CREAT | O_TRUNC | O_RDWR, 0600)) < 0) {
226 fprintf(stderr, "afppasswd: can't create %s\n", path);
231 while ((pwd = getpwent())) {
232 if (pwd->pw_uid < minuid)
234 /* a little paranoia */
235 if (strlen(pwd->pw_name) + FORMAT_LEN > sizeof(buf) - 1)
237 strcpy(buf, pwd->pw_name);
240 if (write(fd, buf, len) != len) {
241 fprintf(stderr, "afppasswd: problem writing to %s: %s\n", path,
254 int main(int argc, char **argv)
258 uid_t uid_min = UID_START, uid;
259 char *path = _PATH_AFPDPWFILE;
265 flags = ((uid = getuid()) == 0) ? OPT_ISROOT : 0;
267 if (((flags & OPT_ISROOT) == 0) && (argc > 1)) {
268 fprintf(stderr, "Usage: afppasswd [-acfn] [-u minuid] [-p path] [username]\n");
269 fprintf(stderr, " -a add a new user\n");
270 fprintf(stderr, " -c create and initialize password file or specific user\n");
271 fprintf(stderr, " -f force an action\n");
273 fprintf(stderr, " -n disable cracklib checking of passwords\n");
274 #endif /* USE_CRACKLIB */
275 fprintf(stderr, " -u uid minimum uid to use, defaults to 100\n");
276 fprintf(stderr, " -p path path to afppasswd file\n");
280 while ((i = getopt(argc, argv, OPTIONS)) != EOF) {
282 case 'c': /* create and initialize password file or specific user */
285 case 'a': /* add a new user */
286 flags |= OPT_ADDUSER;
288 case 'f': /* force an action */
291 case 'u': /* minimum uid to use. default is 100 */
292 uid_min = atoi(optarg);
295 case 'n': /* disable CRACKLIB check */
296 flags |= OPT_NOCRACK;
298 #endif /* USE_CRACKLIB */
299 case 'p': /* path to afppasswd file */
308 if (err || (optind + ((flags & OPT_CREATE) ? 0 :
309 (flags & OPT_ISROOT)) != argc)) {
311 fprintf(stderr, "Usage: afppasswd [-acfn] [-u minuid] [-p path] [username]\n");
312 #else /* USE_CRACKLIB */
313 fprintf(stderr, "Usage: afppasswd [-acf] [-u minuid] [-p path] [username]\n");
314 #endif /* USE_CRACKLIB */
315 fprintf(stderr, " -a add a new user\n");
316 fprintf(stderr, " -c create and initialize password file or specific user\n");
317 fprintf(stderr, " -f force an action\n");
319 fprintf(stderr, " -n disable cracklib checking of passwords\n");
320 #endif /* USE_CRACKLIB */
321 fprintf(stderr, " -u uid minimum uid to use, defaults to 100\n");
322 fprintf(stderr, " -p path path to afppasswd file\n");
327 if (flags & OPT_CREATE) {
328 if ((flags & OPT_ISROOT) == 0) {
329 fprintf(stderr, "afppasswd: only root can create the password file.\n");
333 if (!i && ((flags & OPT_FORCE) == 0)) {
334 fprintf(stderr, "afppasswd: password file already exists.\n");
337 return create_file(path, uid_min);
340 struct passwd *pwd = NULL;
343 fprintf(stderr, "afppasswd: %s doesn't exist.\n", path);
347 /* if we're root, we need to specify the username */
348 pwd = (flags & OPT_ISROOT) ? getpwnam(argv[optind]) : getpwuid(uid);
350 return update_passwd(path, pwd->pw_name, flags);
352 fprintf(stderr, "afppasswd: can't get password entry.\n");