1 /* vi: set sw=4 ts=4: */
3 * Licensed under GPLv2 or later, see file LICENSE in this source tree.
6 //usage:#define passwd_trivial_usage
7 //usage: "[OPTIONS] [USER]"
8 //usage:#define passwd_full_usage "\n\n"
9 //usage: "Change USER's password (default: current user)"
11 //usage: "\n -a ALG Encryption method"
12 //usage: "\n -d Set password to ''"
13 //usage: "\n -l Lock (disable) account"
14 //usage: "\n -u Unlock (enable) account"
18 #include <sys/resource.h> /* setrlimit */
20 static void nuke_str(char *str
)
22 if (str
) memset(str
, 0, strlen(str
));
25 static char* new_password(const struct passwd
*pw
, uid_t myuid
, const char *algo
)
27 char salt
[MAX_PW_SALT_LEN
];
28 char *orig
= (char*)"";
31 char *ret
= NULL
; /* failure so far */
33 if (myuid
!= 0 && pw
->pw_passwd
[0]) {
36 orig
= bb_ask_stdin("Old password: "); /* returns ptr to static */
39 encrypted
= pw_encrypt(orig
, pw
->pw_passwd
, 1); /* returns malloced str */
40 if (strcmp(encrypted
, pw
->pw_passwd
) != 0) {
41 syslog(LOG_WARNING
, "incorrect password for %s", pw
->pw_name
);
42 bb_do_delay(LOGIN_FAIL_DELAY
);
43 puts("Incorrect password");
46 if (ENABLE_FEATURE_CLEAN_UP
)
49 orig
= xstrdup(orig
); /* or else bb_ask_stdin() will destroy it */
50 newp
= bb_ask_stdin("New password: "); /* returns ptr to static */
53 newp
= xstrdup(newp
); /* we are going to bb_ask_stdin() again, so save it */
54 if (ENABLE_FEATURE_PASSWD_WEAK_CHECK
55 && obscure(orig
, newp
, pw
)
58 goto err_ret
; /* non-root is not allowed to have weak passwd */
61 cp
= bb_ask_stdin("Retype password: ");
64 if (strcmp(cp
, newp
) != 0) {
65 puts("Passwords don't match");
69 crypt_make_pw_salt(salt
, algo
);
71 /* pw_encrypt returns malloced str */
72 ret
= pw_encrypt(newp
, salt
, 1);
77 if (ENABLE_FEATURE_CLEAN_UP
) free(orig
);
80 if (ENABLE_FEATURE_CLEAN_UP
) free(newp
);
86 int passwd_main(int argc
, char **argv
) MAIN_EXTERNALLY_VISIBLE
;
87 int passwd_main(int argc UNUSED_PARAM
, char **argv
)
90 OPT_algo
= (1 << 0), /* -a - password algorithm */
91 OPT_lock
= (1 << 1), /* -l - lock account */
92 OPT_unlock
= (1 << 2), /* -u - unlock account */
93 OPT_delete
= (1 << 3), /* -d - delete password */
94 OPT_lud
= OPT_lock
| OPT_unlock
| OPT_delete
,
98 const char *opt_a
= CONFIG_FEATURE_DEFAULT_PASSWD_ALGO
;
105 struct rlimit rlimit_fsize
;
107 #if ENABLE_FEATURE_SHADOWPASSWDS
108 /* Using _r function to avoid pulling in static buffers */
113 logmode
= LOGMODE_BOTH
;
114 openlog(applet_name
, 0, LOG_AUTH
);
115 opt
= getopt32(argv
, "a:lud", &opt_a
);
120 /* -l, -u, -d require root priv and username argument */
121 if ((opt
& OPT_lud
) && (myuid
!= 0 || !argv
[0]))
124 /* Will complain and die if username not found */
125 myname
= xstrdup(xuid2uname(myuid
));
126 name
= argv
[0] ? argv
[0] : myname
;
128 pw
= xgetpwnam(name
);
129 if (myuid
!= 0 && pw
->pw_uid
!= myuid
) {
131 bb_error_msg_and_die("%s can't change password for %s", myname
, name
);
134 #if ENABLE_FEATURE_SHADOWPASSWDS
136 /* getspnam_r may return 0 yet set result to NULL.
137 * At least glibc 2.4 does this. Be extra paranoid here. */
138 struct spwd
*result
= NULL
;
140 if (getspnam_r(pw
->pw_name
, &spw
, buffer
, sizeof(buffer
), &result
) != 0
141 || !result
/* no error, but no record found either */
142 || strcmp(result
->sp_namp
, pw
->pw_name
) != 0 /* paranoia */
144 if (errno
!= ENOENT
) {
146 bb_perror_msg("no record of %s in %s, using %s",
147 name
, bb_path_shadow_file
,
148 bb_path_passwd_file
);
150 /* else: /etc/shadow does not exist,
151 * apparently we are on a shadow-less system,
152 * no surprise there */
154 pw
->pw_passwd
= result
->sp_pwdp
;
159 /* Decide what the new password will be */
161 c
= pw
->pw_passwd
[0] - '!';
162 if (!(opt
& OPT_lud
)) {
163 if (myuid
!= 0 && !c
) { /* passwd starts with '!' */
165 bb_error_msg_and_die("can't change "
166 "locked password for %s", name
);
168 printf("Changing password for %s\n", name
);
169 newp
= new_password(pw
, myuid
, opt_a
);
171 logmode
= LOGMODE_STDIO
;
172 bb_error_msg_and_die("password for %s is unchanged", name
);
174 } else if (opt
& OPT_lock
) {
176 goto skip
; /* passwd starts with '!' */
177 newp
= xasprintf("!%s", pw
->pw_passwd
);
178 } else if (opt
& OPT_unlock
) {
180 goto skip
; /* not '!' */
181 /* pw->pw_passwd points to static storage,
182 * strdup'ing to avoid nasty surprizes */
183 newp
= xstrdup(&pw
->pw_passwd
[1]);
184 } else if (opt
& OPT_delete
) {
188 rlimit_fsize
.rlim_cur
= rlimit_fsize
.rlim_max
= 512L * 30000;
189 setrlimit(RLIMIT_FSIZE
, &rlimit_fsize
);
198 #if ENABLE_FEATURE_SHADOWPASSWDS
199 filename
= bb_path_shadow_file
;
200 rc
= update_passwd(bb_path_shadow_file
, name
, newp
, NULL
);
202 /* password in /etc/shadow was updated */
205 /* 0 = /etc/shadow missing (not an error), >0 = passwd changed in /etc/shadow */
208 filename
= bb_path_passwd_file
;
209 rc
= update_passwd(bb_path_passwd_file
, name
, newp
, NULL
);
213 bb_error_msg_and_die("can't update password file %s", filename
);
214 bb_info_msg("Password for %s changed by %s", name
, myname
);
216 /*if (ENABLE_FEATURE_CLEAN_UP) free(newp); - can't, it may be non-malloced */
219 bb_error_msg_and_die("password for %s is already %slocked",
220 name
, (opt
& OPT_unlock
) ? "un" : "");
223 if (ENABLE_FEATURE_CLEAN_UP
)