1 /* vi: set sw=4 ts=4: */
3 * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
9 static void nuke_str(char *str)
11 if (str) memset(str, 0, strlen(str));
14 static char* new_password(const struct passwd *pw, uid_t myuid, int algo)
16 char salt[sizeof("$N$XXXXXXXX")]; /* "$N$XXXXXXXX" or "XX" */
17 char *orig = (char*)"";
20 char *ret = NULL; /* failure so far */
22 if (myuid && pw->pw_passwd[0]) {
25 orig = bb_ask_stdin("Old password:"); /* returns ptr to static */
28 encrypted = pw_encrypt(orig, pw->pw_passwd, 1); /* returns malloced str */
29 if (strcmp(encrypted, pw->pw_passwd) != 0) {
30 syslog(LOG_WARNING, "incorrect password for %s",
32 bb_do_delay(FAIL_DELAY);
33 puts("Incorrect password");
36 if (ENABLE_FEATURE_CLEAN_UP) free(encrypted);
38 orig = xstrdup(orig); /* or else bb_ask_stdin() will destroy it */
39 newp = bb_ask_stdin("New password:"); /* returns ptr to static */
42 newp = xstrdup(newp); /* we are going to bb_ask_stdin() again, so save it */
43 if (ENABLE_FEATURE_PASSWD_WEAK_CHECK
44 && obscure(orig, newp, pw) && myuid)
45 goto err_ret; /* non-root is not allowed to have weak passwd */
47 cp = bb_ask_stdin("Retype password:");
50 if (strcmp(cp, newp)) {
51 puts("Passwords don't match");
55 crypt_make_salt(salt, 1, 0); /* des */
58 crypt_make_salt(salt + 3, 4, 0);
60 /* pw_encrypt returns malloced str */
61 ret = pw_encrypt(newp, salt, 1);
66 if (ENABLE_FEATURE_CLEAN_UP) free(orig);
68 if (ENABLE_FEATURE_CLEAN_UP) free(newp);
73 int passwd_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
74 int passwd_main(int argc UNUSED_PARAM, char **argv)
77 OPT_algo = 0x1, /* -a - password algorithm */
78 OPT_lock = 0x2, /* -l - lock account */
79 OPT_unlock = 0x4, /* -u - unlock account */
80 OPT_delete = 0x8, /* -d - delete password */
82 STATE_ALGO_md5 = 0x10,
83 //STATE_ALGO_des = 0x20, not needed yet
87 const char *opt_a = "";
94 struct rlimit rlimit_fsize;
96 #if ENABLE_FEATURE_SHADOWPASSWDS
97 /* Using _r function to avoid pulling in static buffers */
102 logmode = LOGMODE_BOTH;
103 openlog(applet_name, LOG_NOWAIT, LOG_AUTH);
104 opt = getopt32(argv, "a:lud", &opt_a);
108 if (strcasecmp(opt_a, "des") != 0) /* -a */
109 opt |= STATE_ALGO_md5;
111 // opt |= STATE_ALGO_des;
113 /* -l, -u, -d require root priv and username argument */
114 if ((opt & OPT_lud) && (myuid || !argv[0]))
117 /* Will complain and die if username not found */
118 myname = xstrdup(xuid2uname(myuid));
119 name = argv[0] ? argv[0] : myname;
121 pw = xgetpwnam(name);
122 if (myuid && pw->pw_uid != myuid) {
124 bb_error_msg_and_die("%s can't change password for %s", myname, name);
127 #if ENABLE_FEATURE_SHADOWPASSWDS
129 /* getspnam_r may return 0 yet set result to NULL.
130 * At least glibc 2.4 does this. Be extra paranoid here. */
131 struct spwd *result = NULL;
132 if (getspnam_r(pw->pw_name, &spw, buffer, sizeof(buffer), &result)
133 || !result || strcmp(result->sp_namp, pw->pw_name) != 0) {
135 bb_error_msg("no record of %s in %s, using %s",
136 name, bb_path_shadow_file,
137 bb_path_passwd_file);
139 pw->pw_passwd = result->sp_pwdp;
144 /* Decide what the new password will be */
146 c = pw->pw_passwd[0] - '!';
147 if (!(opt & OPT_lud)) {
148 if (myuid && !c) { /* passwd starts with '!' */
150 bb_error_msg_and_die("cannot change "
151 "locked password for %s", name);
153 printf("Changing password for %s\n", name);
154 newp = new_password(pw, myuid, opt & STATE_ALGO_md5);
156 logmode = LOGMODE_STDIO;
157 bb_error_msg_and_die("password for %s is unchanged", name);
159 } else if (opt & OPT_lock) {
160 if (!c) goto skip; /* passwd starts with '!' */
161 newp = xasprintf("!%s", pw->pw_passwd);
162 } else if (opt & OPT_unlock) {
163 if (c) goto skip; /* not '!' */
164 /* pw->pw_passwd points to static storage,
165 * strdup'ing to avoid nasty surprizes */
166 newp = xstrdup(&pw->pw_passwd[1]);
167 } else if (opt & OPT_delete) {
168 //newp = xstrdup("");
172 rlimit_fsize.rlim_cur = rlimit_fsize.rlim_max = 512L * 30000;
173 setrlimit(RLIMIT_FSIZE, &rlimit_fsize);
182 #if ENABLE_FEATURE_SHADOWPASSWDS
183 filename = bb_path_shadow_file;
184 rc = update_passwd(bb_path_shadow_file, name, newp);
185 if (rc == 0) /* no lines updated, no errors detected */
188 filename = bb_path_passwd_file;
189 rc = update_passwd(bb_path_passwd_file, name, newp);
193 bb_error_msg_and_die("cannot update password file %s",
195 bb_info_msg("Password for %s changed by %s", name, myname);
197 //if (ENABLE_FEATURE_CLEAN_UP) free(newp);
200 bb_error_msg_and_die("password for %s is already %slocked",
201 name, (opt & OPT_unlock) ? "un" : "");
203 if (ENABLE_FEATURE_CLEAN_UP) free(myname);