1 /* vi: set sw=4 ts=4: */
3 * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
8 static void nuke_str(char *str)
10 if (str) memset(str, 0, strlen(str));
13 static char* new_password(const struct passwd *pw, uid_t myuid, int algo)
15 char salt[sizeof("$N$XXXXXXXX")]; /* "$N$XXXXXXXX" or "XX" */
16 char *orig = (char*)"";
19 char *ret = NULL; /* failure so far */
21 if (myuid && pw->pw_passwd[0]) {
24 orig = bb_ask_stdin("Old password: "); /* returns ptr to static */
27 encrypted = pw_encrypt(orig, pw->pw_passwd, 1); /* returns malloced str */
28 if (strcmp(encrypted, pw->pw_passwd) != 0) {
29 syslog(LOG_WARNING, "incorrect password for %s",
31 bb_do_delay(FAIL_DELAY);
32 puts("Incorrect password");
35 if (ENABLE_FEATURE_CLEAN_UP) free(encrypted);
37 orig = xstrdup(orig); /* or else bb_ask_stdin() will destroy it */
38 newp = bb_ask_stdin("New password: "); /* returns ptr to static */
41 newp = xstrdup(newp); /* we are going to bb_ask_stdin() again, so save it */
42 if (ENABLE_FEATURE_PASSWD_WEAK_CHECK
43 && obscure(orig, newp, pw) && myuid)
44 goto err_ret; /* non-root is not allowed to have weak passwd */
46 cp = bb_ask_stdin("Retype password: ");
49 if (strcmp(cp, newp)) {
50 puts("Passwords don't match");
54 crypt_make_salt(salt, 1, 0); /* des */
57 crypt_make_salt(salt + 3, 4, 0);
59 /* pw_encrypt returns malloced str */
60 ret = pw_encrypt(newp, salt, 1);
65 if (ENABLE_FEATURE_CLEAN_UP) free(orig);
67 if (ENABLE_FEATURE_CLEAN_UP) free(newp);
72 int passwd_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
73 int passwd_main(int argc UNUSED_PARAM, char **argv)
76 OPT_algo = 0x1, /* -a - password algorithm */
77 OPT_lock = 0x2, /* -l - lock account */
78 OPT_unlock = 0x4, /* -u - unlock account */
79 OPT_delete = 0x8, /* -d - delete password */
81 STATE_ALGO_md5 = 0x10,
82 //STATE_ALGO_des = 0x20, not needed yet
86 const char *opt_a = "";
93 struct rlimit rlimit_fsize;
95 #if ENABLE_FEATURE_SHADOWPASSWDS
96 /* Using _r function to avoid pulling in static buffers */
101 logmode = LOGMODE_BOTH;
102 openlog(applet_name, 0, LOG_AUTH);
103 opt = getopt32(argv, "a:lud", &opt_a);
107 if (strcasecmp(opt_a, "des") != 0) /* -a */
108 opt |= STATE_ALGO_md5;
110 // opt |= STATE_ALGO_des;
112 /* -l, -u, -d require root priv and username argument */
113 if ((opt & OPT_lud) && (myuid || !argv[0]))
116 /* Will complain and die if username not found */
117 myname = xstrdup(xuid2uname(myuid));
118 name = argv[0] ? argv[0] : myname;
120 pw = xgetpwnam(name);
121 if (myuid && pw->pw_uid != myuid) {
123 bb_error_msg_and_die("%s can't change password for %s", myname, name);
126 #if ENABLE_FEATURE_SHADOWPASSWDS
128 /* getspnam_r may return 0 yet set result to NULL.
129 * At least glibc 2.4 does this. Be extra paranoid here. */
130 struct spwd *result = NULL;
131 if (getspnam_r(pw->pw_name, &spw, buffer, sizeof(buffer), &result)
132 || !result || strcmp(result->sp_namp, pw->pw_name) != 0) {
134 bb_error_msg("no record of %s in %s, using %s",
135 name, bb_path_shadow_file,
136 bb_path_passwd_file);
138 pw->pw_passwd = result->sp_pwdp;
143 /* Decide what the new password will be */
145 c = pw->pw_passwd[0] - '!';
146 if (!(opt & OPT_lud)) {
147 if (myuid && !c) { /* passwd starts with '!' */
149 bb_error_msg_and_die("can't change "
150 "locked password for %s", name);
152 printf("Changing password for %s\n", name);
153 newp = new_password(pw, myuid, opt & STATE_ALGO_md5);
155 logmode = LOGMODE_STDIO;
156 bb_error_msg_and_die("password for %s is unchanged", name);
158 } else if (opt & OPT_lock) {
159 if (!c) goto skip; /* passwd starts with '!' */
160 newp = xasprintf("!%s", pw->pw_passwd);
161 } else if (opt & OPT_unlock) {
162 if (c) goto skip; /* not '!' */
163 /* pw->pw_passwd points to static storage,
164 * strdup'ing to avoid nasty surprizes */
165 newp = xstrdup(&pw->pw_passwd[1]);
166 } else if (opt & OPT_delete) {
167 //newp = xstrdup("");
171 rlimit_fsize.rlim_cur = rlimit_fsize.rlim_max = 512L * 30000;
172 setrlimit(RLIMIT_FSIZE, &rlimit_fsize);
181 #if ENABLE_FEATURE_SHADOWPASSWDS
182 filename = bb_path_shadow_file;
183 rc = update_passwd(bb_path_shadow_file, name, newp, NULL);
184 if (rc == 0) /* no lines updated, no errors detected */
187 filename = bb_path_passwd_file;
188 rc = update_passwd(bb_path_passwd_file, name, newp, NULL);
192 bb_error_msg_and_die("can't update password file %s",
194 bb_info_msg("Password for %s changed by %s", name, myname);
196 //if (ENABLE_FEATURE_CLEAN_UP) free(newp);
199 bb_error_msg_and_die("password for %s is already %slocked",
200 name, (opt & OPT_unlock) ? "un" : "");
202 if (ENABLE_FEATURE_CLEAN_UP) free(myname);