1 | /* vi: set sw=4 ts=4: */
|
---|
2 | /*
|
---|
3 | * Licensed under GPLv2 or later, see file LICENSE in this source tree.
|
---|
4 | */
|
---|
5 |
|
---|
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)"
|
---|
10 | //usage: "\n"
|
---|
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"
|
---|
15 |
|
---|
16 | #include "libbb.h"
|
---|
17 | #include <syslog.h>
|
---|
18 | #include <sys/resource.h> /* setrlimit */
|
---|
19 |
|
---|
20 | static void nuke_str(char *str)
|
---|
21 | {
|
---|
22 | if (str) memset(str, 0, strlen(str));
|
---|
23 | }
|
---|
24 |
|
---|
25 | static char* new_password(const struct passwd *pw, uid_t myuid, const char *algo)
|
---|
26 | {
|
---|
27 | char salt[MAX_PW_SALT_LEN];
|
---|
28 | char *orig = (char*)"";
|
---|
29 | char *newp = NULL;
|
---|
30 | char *cp = NULL;
|
---|
31 | char *ret = NULL; /* failure so far */
|
---|
32 |
|
---|
33 | if (myuid != 0 && pw->pw_passwd[0]) {
|
---|
34 | char *encrypted;
|
---|
35 |
|
---|
36 | orig = bb_ask_stdin("Old password: "); /* returns ptr to static */
|
---|
37 | if (!orig)
|
---|
38 | goto err_ret;
|
---|
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");
|
---|
44 | goto err_ret;
|
---|
45 | }
|
---|
46 | if (ENABLE_FEATURE_CLEAN_UP)
|
---|
47 | free(encrypted);
|
---|
48 | }
|
---|
49 | orig = xstrdup(orig); /* or else bb_ask_stdin() will destroy it */
|
---|
50 | newp = bb_ask_stdin("New password: "); /* returns ptr to static */
|
---|
51 | if (!newp)
|
---|
52 | goto err_ret;
|
---|
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)
|
---|
56 | && myuid != 0
|
---|
57 | ) {
|
---|
58 | goto err_ret; /* non-root is not allowed to have weak passwd */
|
---|
59 | }
|
---|
60 |
|
---|
61 | cp = bb_ask_stdin("Retype password: ");
|
---|
62 | if (!cp)
|
---|
63 | goto err_ret;
|
---|
64 | if (strcmp(cp, newp) != 0) {
|
---|
65 | puts("Passwords don't match");
|
---|
66 | goto err_ret;
|
---|
67 | }
|
---|
68 |
|
---|
69 | crypt_make_pw_salt(salt, algo);
|
---|
70 |
|
---|
71 | /* pw_encrypt returns malloced str */
|
---|
72 | ret = pw_encrypt(newp, salt, 1);
|
---|
73 | /* whee, success! */
|
---|
74 |
|
---|
75 | err_ret:
|
---|
76 | nuke_str(orig);
|
---|
77 | if (ENABLE_FEATURE_CLEAN_UP) free(orig);
|
---|
78 |
|
---|
79 | nuke_str(newp);
|
---|
80 | if (ENABLE_FEATURE_CLEAN_UP) free(newp);
|
---|
81 |
|
---|
82 | nuke_str(cp);
|
---|
83 | return ret;
|
---|
84 | }
|
---|
85 |
|
---|
86 | int passwd_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
|
---|
87 | int passwd_main(int argc UNUSED_PARAM, char **argv)
|
---|
88 | {
|
---|
89 | enum {
|
---|
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,
|
---|
95 | };
|
---|
96 | unsigned opt;
|
---|
97 | int rc;
|
---|
98 | const char *opt_a = CONFIG_FEATURE_DEFAULT_PASSWD_ALGO;
|
---|
99 | const char *filename;
|
---|
100 | char *myname;
|
---|
101 | char *name;
|
---|
102 | char *newp;
|
---|
103 | struct passwd *pw;
|
---|
104 | uid_t myuid;
|
---|
105 | struct rlimit rlimit_fsize;
|
---|
106 | char c;
|
---|
107 | #if ENABLE_FEATURE_SHADOWPASSWDS
|
---|
108 | /* Using _r function to avoid pulling in static buffers */
|
---|
109 | struct spwd spw;
|
---|
110 | char buffer[256];
|
---|
111 | #endif
|
---|
112 |
|
---|
113 | logmode = LOGMODE_BOTH;
|
---|
114 | openlog(applet_name, 0, LOG_AUTH);
|
---|
115 | opt = getopt32(argv, "a:lud", &opt_a);
|
---|
116 | //argc -= optind;
|
---|
117 | argv += optind;
|
---|
118 |
|
---|
119 | myuid = getuid();
|
---|
120 | /* -l, -u, -d require root priv and username argument */
|
---|
121 | if ((opt & OPT_lud) && (myuid != 0 || !argv[0]))
|
---|
122 | bb_show_usage();
|
---|
123 |
|
---|
124 | /* Will complain and die if username not found */
|
---|
125 | myname = xstrdup(xuid2uname(myuid));
|
---|
126 | name = argv[0] ? argv[0] : myname;
|
---|
127 |
|
---|
128 | pw = xgetpwnam(name);
|
---|
129 | if (myuid != 0 && pw->pw_uid != myuid) {
|
---|
130 | /* LOGMODE_BOTH */
|
---|
131 | bb_error_msg_and_die("%s can't change password for %s", myname, name);
|
---|
132 | }
|
---|
133 |
|
---|
134 | #if ENABLE_FEATURE_SHADOWPASSWDS
|
---|
135 | {
|
---|
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;
|
---|
139 | errno = 0;
|
---|
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 */
|
---|
143 | ) {
|
---|
144 | if (errno != ENOENT) {
|
---|
145 | /* LOGMODE_BOTH */
|
---|
146 | bb_perror_msg("no record of %s in %s, using %s",
|
---|
147 | name, bb_path_shadow_file,
|
---|
148 | bb_path_passwd_file);
|
---|
149 | }
|
---|
150 | /* else: /etc/shadow does not exist,
|
---|
151 | * apparently we are on a shadow-less system,
|
---|
152 | * no surprise there */
|
---|
153 | } else {
|
---|
154 | pw->pw_passwd = result->sp_pwdp;
|
---|
155 | }
|
---|
156 | }
|
---|
157 | #endif
|
---|
158 |
|
---|
159 | /* Decide what the new password will be */
|
---|
160 | newp = NULL;
|
---|
161 | c = pw->pw_passwd[0] - '!';
|
---|
162 | if (!(opt & OPT_lud)) {
|
---|
163 | if (myuid != 0 && !c) { /* passwd starts with '!' */
|
---|
164 | /* LOGMODE_BOTH */
|
---|
165 | bb_error_msg_and_die("can't change "
|
---|
166 | "locked password for %s", name);
|
---|
167 | }
|
---|
168 | printf("Changing password for %s\n", name);
|
---|
169 | newp = new_password(pw, myuid, opt_a);
|
---|
170 | if (!newp) {
|
---|
171 | logmode = LOGMODE_STDIO;
|
---|
172 | bb_error_msg_and_die("password for %s is unchanged", name);
|
---|
173 | }
|
---|
174 | } else if (opt & OPT_lock) {
|
---|
175 | if (!c)
|
---|
176 | goto skip; /* passwd starts with '!' */
|
---|
177 | newp = xasprintf("!%s", pw->pw_passwd);
|
---|
178 | } else if (opt & OPT_unlock) {
|
---|
179 | if (c)
|
---|
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) {
|
---|
185 | newp = (char*)"";
|
---|
186 | }
|
---|
187 |
|
---|
188 | rlimit_fsize.rlim_cur = rlimit_fsize.rlim_max = 512L * 30000;
|
---|
189 | setrlimit(RLIMIT_FSIZE, &rlimit_fsize);
|
---|
190 | bb_signals(0
|
---|
191 | + (1 << SIGHUP)
|
---|
192 | + (1 << SIGINT)
|
---|
193 | + (1 << SIGQUIT)
|
---|
194 | , SIG_IGN);
|
---|
195 | umask(077);
|
---|
196 | xsetuid(0);
|
---|
197 |
|
---|
198 | #if ENABLE_FEATURE_SHADOWPASSWDS
|
---|
199 | filename = bb_path_shadow_file;
|
---|
200 | rc = update_passwd(bb_path_shadow_file, name, newp, NULL);
|
---|
201 | if (rc > 0)
|
---|
202 | /* password in /etc/shadow was updated */
|
---|
203 | newp = (char*) "x";
|
---|
204 | if (rc >= 0)
|
---|
205 | /* 0 = /etc/shadow missing (not an error), >0 = passwd changed in /etc/shadow */
|
---|
206 | #endif
|
---|
207 | {
|
---|
208 | filename = bb_path_passwd_file;
|
---|
209 | rc = update_passwd(bb_path_passwd_file, name, newp, NULL);
|
---|
210 | }
|
---|
211 | /* LOGMODE_BOTH */
|
---|
212 | if (rc < 0)
|
---|
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);
|
---|
215 |
|
---|
216 | /*if (ENABLE_FEATURE_CLEAN_UP) free(newp); - can't, it may be non-malloced */
|
---|
217 | skip:
|
---|
218 | if (!newp) {
|
---|
219 | bb_error_msg_and_die("password for %s is already %slocked",
|
---|
220 | name, (opt & OPT_unlock) ? "un" : "");
|
---|
221 | }
|
---|
222 |
|
---|
223 | if (ENABLE_FEATURE_CLEAN_UP)
|
---|
224 | free(myname);
|
---|
225 | return 0;
|
---|
226 | }
|
---|