| 1 | /* vi: set sw=4 ts=4: */
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| 2 | /*
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| 3 | * Licensed under GPLv2 or later, see file LICENSE in this source tree.
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| 4 | */
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| 5 | #include "libbb.h"
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| 6 | #include <syslog.h>
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| 7 |
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| 8 | static void nuke_str(char *str)
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| 9 | {
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| 10 | if (str) memset(str, 0, strlen(str));
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| 11 | }
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| 12 |
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| 13 | static char* new_password(const struct passwd *pw, uid_t myuid, int algo)
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| 14 | {
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| 15 | char salt[sizeof("$N$XXXXXXXX")]; /* "$N$XXXXXXXX" or "XX" */
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| 16 | char *orig = (char*)"";
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| 17 | char *newp = NULL;
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| 18 | char *cp = NULL;
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| 19 | char *ret = NULL; /* failure so far */
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| 20 |
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| 21 | if (myuid && pw->pw_passwd[0]) {
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| 22 | char *encrypted;
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| 23 |
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| 24 | orig = bb_ask_stdin("Old password: "); /* returns ptr to static */
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| 25 | if (!orig)
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| 26 | goto err_ret;
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| 27 | encrypted = pw_encrypt(orig, pw->pw_passwd, 1); /* returns malloced str */
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| 28 | if (strcmp(encrypted, pw->pw_passwd) != 0) {
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| 29 | syslog(LOG_WARNING, "incorrect password for %s",
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| 30 | pw->pw_name);
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| 31 | bb_do_delay(FAIL_DELAY);
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| 32 | puts("Incorrect password");
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| 33 | goto err_ret;
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| 34 | }
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| 35 | if (ENABLE_FEATURE_CLEAN_UP) free(encrypted);
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| 36 | }
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| 37 | orig = xstrdup(orig); /* or else bb_ask_stdin() will destroy it */
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| 38 | newp = bb_ask_stdin("New password: "); /* returns ptr to static */
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| 39 | if (!newp)
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| 40 | goto err_ret;
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| 41 | newp = xstrdup(newp); /* we are going to bb_ask_stdin() again, so save it */
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| 42 | if (ENABLE_FEATURE_PASSWD_WEAK_CHECK
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| 43 | && obscure(orig, newp, pw) && myuid)
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| 44 | goto err_ret; /* non-root is not allowed to have weak passwd */
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| 45 |
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| 46 | cp = bb_ask_stdin("Retype password: ");
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| 47 | if (!cp)
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| 48 | goto err_ret;
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| 49 | if (strcmp(cp, newp)) {
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| 50 | puts("Passwords don't match");
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| 51 | goto err_ret;
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| 52 | }
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| 53 |
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| 54 | crypt_make_salt(salt, 1, 0); /* des */
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| 55 | if (algo) { /* MD5 */
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| 56 | strcpy(salt, "$1$");
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| 57 | crypt_make_salt(salt + 3, 4, 0);
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| 58 | }
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| 59 | /* pw_encrypt returns malloced str */
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| 60 | ret = pw_encrypt(newp, salt, 1);
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| 61 | /* whee, success! */
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| 62 |
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| 63 | err_ret:
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| 64 | nuke_str(orig);
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| 65 | if (ENABLE_FEATURE_CLEAN_UP) free(orig);
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| 66 | nuke_str(newp);
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| 67 | if (ENABLE_FEATURE_CLEAN_UP) free(newp);
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| 68 | nuke_str(cp);
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| 69 | return ret;
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| 70 | }
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| 71 |
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| 72 | int passwd_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
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| 73 | int passwd_main(int argc UNUSED_PARAM, char **argv)
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| 74 | {
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| 75 | enum {
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| 76 | OPT_algo = 0x1, /* -a - password algorithm */
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| 77 | OPT_lock = 0x2, /* -l - lock account */
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| 78 | OPT_unlock = 0x4, /* -u - unlock account */
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| 79 | OPT_delete = 0x8, /* -d - delete password */
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| 80 | OPT_lud = 0xe,
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| 81 | STATE_ALGO_md5 = 0x10,
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| 82 | //STATE_ALGO_des = 0x20, not needed yet
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| 83 | };
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| 84 | unsigned opt;
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| 85 | int rc;
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| 86 | const char *opt_a = "";
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| 87 | const char *filename;
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| 88 | char *myname;
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| 89 | char *name;
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| 90 | char *newp;
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| 91 | struct passwd *pw;
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| 92 | uid_t myuid;
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| 93 | struct rlimit rlimit_fsize;
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| 94 | char c;
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| 95 | #if ENABLE_FEATURE_SHADOWPASSWDS
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| 96 | /* Using _r function to avoid pulling in static buffers */
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| 97 | struct spwd spw;
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| 98 | char buffer[256];
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| 99 | #endif
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| 100 |
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| 101 | logmode = LOGMODE_BOTH;
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| 102 | openlog(applet_name, 0, LOG_AUTH);
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| 103 | opt = getopt32(argv, "a:lud", &opt_a);
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| 104 | //argc -= optind;
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| 105 | argv += optind;
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| 106 |
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| 107 | if (strcasecmp(opt_a, "des") != 0) /* -a */
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| 108 | opt |= STATE_ALGO_md5;
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| 109 | //else
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| 110 | // opt |= STATE_ALGO_des;
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| 111 | myuid = getuid();
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| 112 | /* -l, -u, -d require root priv and username argument */
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| 113 | if ((opt & OPT_lud) && (myuid || !argv[0]))
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| 114 | bb_show_usage();
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| 115 |
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| 116 | /* Will complain and die if username not found */
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| 117 | myname = xstrdup(xuid2uname(myuid));
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| 118 | name = argv[0] ? argv[0] : myname;
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| 119 |
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| 120 | pw = xgetpwnam(name);
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| 121 | if (myuid && pw->pw_uid != myuid) {
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| 122 | /* LOGMODE_BOTH */
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| 123 | bb_error_msg_and_die("%s can't change password for %s", myname, name);
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| 124 | }
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| 125 |
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| 126 | #if ENABLE_FEATURE_SHADOWPASSWDS
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| 127 | {
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| 128 | /* getspnam_r may return 0 yet set result to NULL.
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| 129 | * At least glibc 2.4 does this. Be extra paranoid here. */
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| 130 | struct spwd *result = NULL;
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| 131 | errno = 0;
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| 132 | if (getspnam_r(pw->pw_name, &spw, buffer, sizeof(buffer), &result) != 0
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| 133 | || !result /* no error, but no record found either */
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| 134 | || strcmp(result->sp_namp, pw->pw_name) != 0 /* paranoia */
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| 135 | ) {
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| 136 | if (errno != ENOENT) {
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| 137 | /* LOGMODE_BOTH */
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| 138 | bb_perror_msg("no record of %s in %s, using %s",
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| 139 | name, bb_path_shadow_file,
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| 140 | bb_path_passwd_file);
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| 141 | }
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| 142 | /* else: /etc/shadow does not exist,
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| 143 | * apparently we are on a shadow-less system,
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| 144 | * no surprise there */
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| 145 | } else {
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| 146 | pw->pw_passwd = result->sp_pwdp;
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| 147 | }
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| 148 | }
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| 149 | #endif
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| 150 |
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| 151 | /* Decide what the new password will be */
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| 152 | newp = NULL;
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| 153 | c = pw->pw_passwd[0] - '!';
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| 154 | if (!(opt & OPT_lud)) {
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| 155 | if (myuid && !c) { /* passwd starts with '!' */
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| 156 | /* LOGMODE_BOTH */
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| 157 | bb_error_msg_and_die("can't change "
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| 158 | "locked password for %s", name);
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| 159 | }
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| 160 | printf("Changing password for %s\n", name);
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| 161 | newp = new_password(pw, myuid, opt & STATE_ALGO_md5);
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| 162 | if (!newp) {
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| 163 | logmode = LOGMODE_STDIO;
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| 164 | bb_error_msg_and_die("password for %s is unchanged", name);
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| 165 | }
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| 166 | } else if (opt & OPT_lock) {
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| 167 | if (!c) goto skip; /* passwd starts with '!' */
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| 168 | newp = xasprintf("!%s", pw->pw_passwd);
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| 169 | } else if (opt & OPT_unlock) {
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| 170 | if (c) goto skip; /* not '!' */
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| 171 | /* pw->pw_passwd points to static storage,
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| 172 | * strdup'ing to avoid nasty surprizes */
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| 173 | newp = xstrdup(&pw->pw_passwd[1]);
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| 174 | } else if (opt & OPT_delete) {
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| 175 | //newp = xstrdup("");
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| 176 | newp = (char*)"";
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| 177 | }
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| 178 |
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| 179 | rlimit_fsize.rlim_cur = rlimit_fsize.rlim_max = 512L * 30000;
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| 180 | setrlimit(RLIMIT_FSIZE, &rlimit_fsize);
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| 181 | bb_signals(0
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| 182 | + (1 << SIGHUP)
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| 183 | + (1 << SIGINT)
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| 184 | + (1 << SIGQUIT)
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| 185 | , SIG_IGN);
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| 186 | umask(077);
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| 187 | xsetuid(0);
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| 188 |
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| 189 | #if ENABLE_FEATURE_SHADOWPASSWDS
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| 190 | filename = bb_path_shadow_file;
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| 191 | rc = update_passwd(bb_path_shadow_file, name, newp, NULL);
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| 192 | if (rc == 0) /* no lines updated, no errors detected */
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| 193 | #endif
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| 194 | {
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| 195 | filename = bb_path_passwd_file;
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| 196 | rc = update_passwd(bb_path_passwd_file, name, newp, NULL);
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| 197 | }
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| 198 | /* LOGMODE_BOTH */
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| 199 | if (rc < 0)
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| 200 | bb_error_msg_and_die("can't update password file %s",
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| 201 | filename);
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| 202 | bb_info_msg("Password for %s changed by %s", name, myname);
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| 203 |
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| 204 | //if (ENABLE_FEATURE_CLEAN_UP) free(newp);
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| 205 | skip:
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| 206 | if (!newp) {
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| 207 | bb_error_msg_and_die("password for %s is already %slocked",
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| 208 | name, (opt & OPT_unlock) ? "un" : "");
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| 209 | }
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| 210 | if (ENABLE_FEATURE_CLEAN_UP) free(myname);
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| 211 | return 0;
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| 212 | }
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