2 * Copyright 1999 (c) Adrian Sun (asun@u.washington.edu)
3 * All Rights Reserved. See COPYRIGHT.
5 * format of the password file:
6 * name:****************:****************:********
7 * password last login date failed usage count
9 * ***'s are illegal. they're just place holders for hex values. hex
10 * values that represent actual numbers are in network byte order.
12 * last login date is currently a 4-byte number representing seconds
13 * since 1970 (UTC). there's enough space to extend it to 8 bytes.
15 * the last two fields aren't currently used by the randnum uams.
17 * root syntax: afppasswd [-c] [-a] [-p path] [-f] [username]
18 * user syntax: afppasswd
30 #include <sys/types.h>
32 #include <sys/param.h>
36 #include <netatalk/endian.h>
45 #define OPT_ISROOT (1 << 0)
46 #define OPT_CREATE (1 << 1)
47 #define OPT_FORCE (1 << 2)
48 #define OPT_ADDUSER (1 << 3)
50 #define PASSWD_ILLEGAL '*'
52 #define FORMAT ":****************:****************:********\n"
54 #define OPTIONS "cafu:p:"
57 #define HEXPASSWDLEN 16
60 static char buf[MAXPATHLEN + 1];
62 /* if newpwd is null, convert buf from hex to binary. if newpwd isn't
63 * null, convert newpwd to hex and save it in buf. */
64 #define unhex(x) (isdigit(x) ? (x) - '0' : toupper(x) + 10 - 'A')
65 static void convert_passwd(char *buf, char *newpwd, const int keyfd)
67 u_int8_t key[HEXPASSWDLEN];
68 Key_schedule schedule;
72 /* convert to binary */
73 for (i = j = 0; i < sizeof(key); i += 2, j++)
74 buf[j] = (unhex(buf[i]) << 4) | unhex(buf[i + 1]);
76 memset(buf + j, 0, sizeof(key) - j);
80 lseek(keyfd, 0, SEEK_SET);
81 read(keyfd, key, sizeof(key));
82 /* convert to binary */
83 for (i = j = 0; i < sizeof(key); i += 2, j++)
84 key[j] = (unhex(key[i]) << 4) | unhex(key[i + 1]);
86 memset(key + j, 0, sizeof(key) - j);
87 key_sched((C_Block *) key, schedule);
88 memset(key, 0, sizeof(key));
90 ecb_encrypt((C_Block *) newpwd, (C_Block *) newpwd, schedule,
93 /* decrypt the password */
94 ecb_encrypt((C_Block *) buf, (C_Block *) buf, schedule, DES_DECRYPT);
96 memset(schedule, 0, sizeof(schedule));
100 const unsigned char hextable[] = "0123456789ABCDEF";
103 for (i = j = 0; i < DES_KEY_SZ; i++, j += 2) {
104 buf[j] = hextable[(newpwd[i] & 0xF0) >> 4];
105 buf[j + 1] = hextable[newpwd[i] & 0x0F];
110 /* this matches the code in uam_randnum.c */
111 static int update_passwd(const char *path, const char *name, int flags)
113 char password[PASSWDLEN + 1], *p, *passwd;
116 int keyfd = -1, err = 0;
118 if ((fp = fopen(path, "r+")) == NULL) {
119 fprintf(stderr, "afppasswd: can't open %s\n", path);
123 /* open the key file if it exists */
125 if (strlen(path) < sizeof(buf) - 5) {
127 keyfd = open(buf, O_RDONLY);
131 memset(buf, 0, sizeof(buf));
132 while (fgets(buf, sizeof(buf), fp)) {
133 if ((p = strchr(buf, ':'))) {
134 /* check for a match */
135 if (strncmp(buf, name, p - buf) == 0) {
137 if (!(flags & OPT_ISROOT) && (*p == PASSWD_ILLEGAL)) {
138 fprintf(stderr, "Your password is disabled. Please see your administrator.\n");
145 memset(buf, 0, sizeof(buf));
148 if (flags & OPT_ADDUSER) {
151 p = strchr(buf, ':') + 1;
152 fwrite(buf, strlen(buf), 1, fp);
154 fprintf(stderr, "afppasswd: can't find %s in %s\n", name, path);
160 /* need to verify against old password */
161 if ((flags & OPT_ISROOT) == 0) {
162 passwd = getpass("Enter OLD AFP password: ");
163 convert_passwd(p, NULL, keyfd);
164 if (strncmp(passwd, p, PASSWDLEN)) {
165 fprintf(stderr, "afppasswd: invalid password.\n");
172 passwd = getpass("Enter NEW AFP password: ");
173 memcpy(password, passwd, sizeof(password));
174 password[PASSWDLEN] = '\0';
176 if ((passwd = FascistCheck(password, _PATH_CRACKLIB))) {
177 fprintf(stderr, "Error: %s\n", passwd);
183 passwd = getpass("Enter NEW AFP password again: ");
184 if (strcmp(passwd, password) == 0) {
188 convert_passwd(p, password, keyfd);
189 lock.l_type = F_WRLCK;
192 lock.l_whence = SEEK_SET;
193 fseek(fp, pos, SEEK_SET);
194 fcntl(fd, F_SETLKW, &lock);
195 fwrite(buf, p - buf + HEXPASSWDLEN, 1, fp);
196 lock.l_type = F_UNLCK;
197 fcntl(fd, F_SETLK, &lock);
198 printf("afppasswd: updated password.\n");
201 fprintf(stderr, "afppasswd: passwords don't match!\n");
213 /* creates a file with all the password entries */
214 static int create_file(const char *path, uid_t minuid)
217 int fd, len, err = 0;
220 if ((fd = open(path, O_CREAT | O_TRUNC | O_RDWR, 0600)) < 0) {
221 fprintf(stderr, "afppasswd: can't create %s\n", path);
226 while ((pwd = getpwent())) {
227 if (pwd->pw_uid < minuid)
229 /* a little paranoia */
230 if (strlen(pwd->pw_name) + FORMAT_LEN > sizeof(buf) - 1)
232 strcpy(buf, pwd->pw_name);
235 if (write(fd, buf, len) != len) {
236 fprintf(stderr, "afppasswd: problem writing to %s: %m\n", path);
248 int main(int argc, char **argv)
252 uid_t uid_min = UID_START, uid;
253 char *path = _PATH_AFPDPWFILE;
257 extern int optind, opterr;
259 flags = ((uid = getuid()) == 0) ? OPT_ISROOT : 0;
261 if (((flags & OPT_ISROOT) == 0) && (argc > 1)) {
262 fprintf(stderr, "Usage: afppasswd\n");
266 while ((i = getopt(argc, argv, OPTIONS)) != EOF) {
268 case 'c': /* create and initialize password file or specific user */
271 case 'a': /* add a new user */
272 flags |= OPT_ADDUSER;
273 case 'f': /* force an action */
276 case 'u': /* minimum uid to use. default is 100 */
277 uid_min = atoi(optarg);
279 case 'p': /* path to afppasswd file */
288 if (err || (optind + ((flags & OPT_CREATE) ? 0 :
289 (flags & OPT_ISROOT)) != argc)) {
290 fprintf(stderr, "Usage: afppasswd [-acf] [-u minuid] [-p path] [username]\n");
295 if (flags & OPT_CREATE) {
296 if ((flags & OPT_ISROOT) == 0) {
297 fprintf(stderr, "afppasswd: only root can create the password file.\n");
301 if (!i && ((flags & OPT_FORCE) == 0)) {
302 fprintf(stderr, "afppasswd: password file already exists.\n");
305 return create_file(path, uid_min);
308 struct passwd *pwd = NULL;
311 fprintf(stderr, "afppasswd: %s doesn't exist.\n", path);
315 /* if we're root, we need to specify the username */
316 pwd = (flags & OPT_ISROOT) ? getpwnam(argv[optind]) : getpwuid(uid);
318 return update_passwd(path, pwd->pw_name, flags);
320 fprintf(stderr, "afppasswd: can't get password entry.\n");
326 main(int argc, char **argv)
328 fprintf(stderr, "afppasswd is only useful if you're using centralized passwords\n");
329 fprintf(stderr, "for the Random Number authentication methods.\n");