[821] | 1 | /* vi: set sw=4 ts=4: */
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[1765] | 2 | /*
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[2725] | 3 | * Licensed under GPLv2 or later, see file LICENSE in this source tree.
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[1765] | 4 | */
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[3232] | 5 |
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| 6 | //usage:#define passwd_trivial_usage
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| 7 | //usage: "[OPTIONS] [USER]"
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| 8 | //usage:#define passwd_full_usage "\n\n"
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| 9 | //usage: "Change USER's password (default: current user)"
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| 10 | //usage: "\n"
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| 11 | //usage: "\n -a ALG Encryption method"
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| 12 | //usage: "\n -d Set password to ''"
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| 13 | //usage: "\n -l Lock (disable) account"
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| 14 | //usage: "\n -u Unlock (enable) account"
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| 15 |
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[1765] | 16 | #include "libbb.h"
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[821] | 17 | #include <syslog.h>
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[3232] | 18 | #include <sys/resource.h> /* setrlimit */
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[821] | 19 |
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[1765] | 20 | static void nuke_str(char *str)
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[821] | 21 | {
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[1765] | 22 | if (str) memset(str, 0, strlen(str));
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[821] | 23 | }
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| 24 |
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[3232] | 25 | static char* new_password(const struct passwd *pw, uid_t myuid, const char *algo)
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[821] | 26 | {
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[3232] | 27 | char salt[MAX_PW_SALT_LEN];
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[1765] | 28 | char *orig = (char*)"";
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| 29 | char *newp = NULL;
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| 30 | char *cp = NULL;
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| 31 | char *ret = NULL; /* failure so far */
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[821] | 32 |
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[3232] | 33 | if (myuid != 0 && pw->pw_passwd[0]) {
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[2725] | 34 | char *encrypted;
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| 35 |
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| 36 | orig = bb_ask_stdin("Old password: "); /* returns ptr to static */
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[1765] | 37 | if (!orig)
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| 38 | goto err_ret;
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[2725] | 39 | encrypted = pw_encrypt(orig, pw->pw_passwd, 1); /* returns malloced str */
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| 40 | if (strcmp(encrypted, pw->pw_passwd) != 0) {
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[3232] | 41 | syslog(LOG_WARNING, "incorrect password for %s", pw->pw_name);
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| 42 | bb_do_delay(LOGIN_FAIL_DELAY);
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[1765] | 43 | puts("Incorrect password");
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| 44 | goto err_ret;
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| 45 | }
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[3232] | 46 | if (ENABLE_FEATURE_CLEAN_UP)
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| 47 | free(encrypted);
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[821] | 48 | }
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[2725] | 49 | orig = xstrdup(orig); /* or else bb_ask_stdin() will destroy it */
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| 50 | newp = bb_ask_stdin("New password: "); /* returns ptr to static */
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[1765] | 51 | if (!newp)
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| 52 | goto err_ret;
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[2725] | 53 | newp = xstrdup(newp); /* we are going to bb_ask_stdin() again, so save it */
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[1765] | 54 | if (ENABLE_FEATURE_PASSWD_WEAK_CHECK
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[3232] | 55 | && obscure(orig, newp, pw)
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| 56 | && myuid != 0
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| 57 | ) {
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[1765] | 58 | goto err_ret; /* non-root is not allowed to have weak passwd */
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[3232] | 59 | }
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[821] | 60 |
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[2725] | 61 | cp = bb_ask_stdin("Retype password: ");
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[1765] | 62 | if (!cp)
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| 63 | goto err_ret;
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[3232] | 64 | if (strcmp(cp, newp) != 0) {
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[1765] | 65 | puts("Passwords don't match");
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| 66 | goto err_ret;
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[821] | 67 | }
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| 68 |
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[3232] | 69 | crypt_make_pw_salt(salt, algo);
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| 70 |
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[2725] | 71 | /* pw_encrypt returns malloced str */
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| 72 | ret = pw_encrypt(newp, salt, 1);
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[1765] | 73 | /* whee, success! */
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[821] | 74 |
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[1765] | 75 | err_ret:
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| 76 | nuke_str(orig);
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| 77 | if (ENABLE_FEATURE_CLEAN_UP) free(orig);
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[3232] | 78 |
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[1765] | 79 | nuke_str(newp);
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| 80 | if (ENABLE_FEATURE_CLEAN_UP) free(newp);
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[3232] | 81 |
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[1765] | 82 | nuke_str(cp);
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| 83 | return ret;
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[821] | 84 | }
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| 85 |
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[2725] | 86 | int passwd_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
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| 87 | int passwd_main(int argc UNUSED_PARAM, char **argv)
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[821] | 88 | {
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[1765] | 89 | enum {
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[3232] | 90 | OPT_algo = (1 << 0), /* -a - password algorithm */
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| 91 | OPT_lock = (1 << 1), /* -l - lock account */
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| 92 | OPT_unlock = (1 << 2), /* -u - unlock account */
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| 93 | OPT_delete = (1 << 3), /* -d - delete password */
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| 94 | OPT_lud = OPT_lock | OPT_unlock | OPT_delete,
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[1765] | 95 | };
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| 96 | unsigned opt;
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| 97 | int rc;
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[3232] | 98 | const char *opt_a = CONFIG_FEATURE_DEFAULT_PASSWD_ALGO;
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[1765] | 99 | const char *filename;
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| 100 | char *myname;
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[821] | 101 | char *name;
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[1765] | 102 | char *newp;
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| 103 | struct passwd *pw;
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| 104 | uid_t myuid;
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| 105 | struct rlimit rlimit_fsize;
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| 106 | char c;
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[821] | 107 | #if ENABLE_FEATURE_SHADOWPASSWDS
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[1765] | 108 | /* Using _r function to avoid pulling in static buffers */
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| 109 | struct spwd spw;
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| 110 | char buffer[256];
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[821] | 111 | #endif
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[1765] | 112 |
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| 113 | logmode = LOGMODE_BOTH;
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[2725] | 114 | openlog(applet_name, 0, LOG_AUTH);
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[1765] | 115 | opt = getopt32(argv, "a:lud", &opt_a);
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| 116 | //argc -= optind;
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| 117 | argv += optind;
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| 118 |
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| 119 | myuid = getuid();
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| 120 | /* -l, -u, -d require root priv and username argument */
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[3232] | 121 | if ((opt & OPT_lud) && (myuid != 0 || !argv[0]))
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[821] | 122 | bb_show_usage();
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[1765] | 123 |
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| 124 | /* Will complain and die if username not found */
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[2725] | 125 | myname = xstrdup(xuid2uname(myuid));
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[1765] | 126 | name = argv[0] ? argv[0] : myname;
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| 127 |
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[2725] | 128 | pw = xgetpwnam(name);
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[3232] | 129 | if (myuid != 0 && pw->pw_uid != myuid) {
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[1765] | 130 | /* LOGMODE_BOTH */
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| 131 | bb_error_msg_and_die("%s can't change password for %s", myname, name);
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[821] | 132 | }
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[1765] | 133 |
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[821] | 134 | #if ENABLE_FEATURE_SHADOWPASSWDS
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[2725] | 135 | {
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| 136 | /* getspnam_r may return 0 yet set result to NULL.
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| 137 | * At least glibc 2.4 does this. Be extra paranoid here. */
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| 138 | struct spwd *result = NULL;
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| 139 | errno = 0;
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| 140 | if (getspnam_r(pw->pw_name, &spw, buffer, sizeof(buffer), &result) != 0
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| 141 | || !result /* no error, but no record found either */
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| 142 | || strcmp(result->sp_namp, pw->pw_name) != 0 /* paranoia */
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| 143 | ) {
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| 144 | if (errno != ENOENT) {
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| 145 | /* LOGMODE_BOTH */
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| 146 | bb_perror_msg("no record of %s in %s, using %s",
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| 147 | name, bb_path_shadow_file,
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| 148 | bb_path_passwd_file);
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| 149 | }
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| 150 | /* else: /etc/shadow does not exist,
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| 151 | * apparently we are on a shadow-less system,
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| 152 | * no surprise there */
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| 153 | } else {
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| 154 | pw->pw_passwd = result->sp_pwdp;
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| 155 | }
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[821] | 156 | }
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| 157 | #endif
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| 158 |
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[1765] | 159 | /* Decide what the new password will be */
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| 160 | newp = NULL;
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| 161 | c = pw->pw_passwd[0] - '!';
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| 162 | if (!(opt & OPT_lud)) {
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[3232] | 163 | if (myuid != 0 && !c) { /* passwd starts with '!' */
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[1765] | 164 | /* LOGMODE_BOTH */
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[2725] | 165 | bb_error_msg_and_die("can't change "
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[1765] | 166 | "locked password for %s", name);
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[821] | 167 | }
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| 168 | printf("Changing password for %s\n", name);
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[3232] | 169 | newp = new_password(pw, myuid, opt_a);
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[1765] | 170 | if (!newp) {
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| 171 | logmode = LOGMODE_STDIO;
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| 172 | bb_error_msg_and_die("password for %s is unchanged", name);
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[821] | 173 | }
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[1765] | 174 | } else if (opt & OPT_lock) {
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[3232] | 175 | if (!c)
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| 176 | goto skip; /* passwd starts with '!' */
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[1765] | 177 | newp = xasprintf("!%s", pw->pw_passwd);
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| 178 | } else if (opt & OPT_unlock) {
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[3232] | 179 | if (c)
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| 180 | goto skip; /* not '!' */
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[2725] | 181 | /* pw->pw_passwd points to static storage,
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[1765] | 182 | * strdup'ing to avoid nasty surprizes */
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| 183 | newp = xstrdup(&pw->pw_passwd[1]);
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| 184 | } else if (opt & OPT_delete) {
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| 185 | newp = (char*)"";
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[821] | 186 | }
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[1765] | 187 |
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| 188 | rlimit_fsize.rlim_cur = rlimit_fsize.rlim_max = 512L * 30000;
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| 189 | setrlimit(RLIMIT_FSIZE, &rlimit_fsize);
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[2725] | 190 | bb_signals(0
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| 191 | + (1 << SIGHUP)
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| 192 | + (1 << SIGINT)
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| 193 | + (1 << SIGQUIT)
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| 194 | , SIG_IGN);
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[821] | 195 | umask(077);
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| 196 | xsetuid(0);
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| 197 |
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[1765] | 198 | #if ENABLE_FEATURE_SHADOWPASSWDS
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| 199 | filename = bb_path_shadow_file;
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[2725] | 200 | rc = update_passwd(bb_path_shadow_file, name, newp, NULL);
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[3232] | 201 | if (rc > 0)
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| 202 | /* password in /etc/shadow was updated */
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| 203 | newp = (char*) "x";
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| 204 | if (rc >= 0)
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| 205 | /* 0 = /etc/shadow missing (not an error), >0 = passwd changed in /etc/shadow */
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[1765] | 206 | #endif
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[821] | 207 | {
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[1765] | 208 | filename = bb_path_passwd_file;
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[2725] | 209 | rc = update_passwd(bb_path_passwd_file, name, newp, NULL);
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[821] | 210 | }
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[1765] | 211 | /* LOGMODE_BOTH */
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| 212 | if (rc < 0)
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[3232] | 213 | bb_error_msg_and_die("can't update password file %s", filename);
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[1765] | 214 | bb_info_msg("Password for %s changed by %s", name, myname);
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[821] | 215 |
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[3232] | 216 | /*if (ENABLE_FEATURE_CLEAN_UP) free(newp); - can't, it may be non-malloced */
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[1765] | 217 | skip:
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| 218 | if (!newp) {
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| 219 | bb_error_msg_and_die("password for %s is already %slocked",
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| 220 | name, (opt & OPT_unlock) ? "un" : "");
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[821] | 221 | }
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[3232] | 222 |
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| 223 | if (ENABLE_FEATURE_CLEAN_UP)
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| 224 | free(myname);
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[821] | 225 | return 0;
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| 226 | }
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