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https://github.com/sheumann/hush.git
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(add/remove: 0/0 grow/shrink: 12/131 up/down: 91/-727) Total: -636 bytes text data bss dec hex filename 773469 1058 11092 785619 bfcd3 busybox_old 772644 1058 11092 784794 bf99a busybox_unstripped
204 lines
5.4 KiB
C
204 lines
5.4 KiB
C
/* vi: set sw=4 ts=4: */
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/*
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* Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
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*/
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#include "libbb.h"
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#include <syslog.h>
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static void nuke_str(char *str)
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{
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if (str) memset(str, 0, strlen(str));
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}
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static char* new_password(const struct passwd *pw, uid_t myuid, int algo)
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{
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char salt[sizeof("$N$XXXXXXXX")]; /* "$N$XXXXXXXX" or "XX" */
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char *orig = (char*)"";
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char *newp = NULL;
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char *cipher = NULL;
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char *cp = NULL;
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char *ret = NULL; /* failure so far */
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if (myuid && pw->pw_passwd[0]) {
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orig = bb_askpass(0, "Old password:"); /* returns ptr to static */
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if (!orig)
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goto err_ret;
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cipher = pw_encrypt(orig, pw->pw_passwd); /* returns ptr to static */
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if (strcmp(cipher, pw->pw_passwd) != 0) {
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syslog(LOG_WARNING, "incorrect password for '%s'",
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pw->pw_name);
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bb_do_delay(FAIL_DELAY);
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puts("Incorrect password");
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goto err_ret;
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}
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}
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orig = xstrdup(orig); /* or else bb_askpass() will destroy it */
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newp = bb_askpass(0, "New password:"); /* returns ptr to static */
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if (!newp)
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goto err_ret;
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newp = xstrdup(newp); /* we are going to bb_askpass() again, so save it */
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if (ENABLE_FEATURE_PASSWD_WEAK_CHECK
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&& obscure(orig, newp, pw) && myuid)
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goto err_ret; /* non-root is not allowed to have weak passwd */
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cp = bb_askpass(0, "Retype password:");
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if (!cp)
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goto err_ret;
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if (strcmp(cp, newp)) {
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puts("Passwords don't match");
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goto err_ret;
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}
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crypt_make_salt(salt, 1, 0); /* des */
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if (algo) { /* MD5 */
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strcpy(salt, "$1$");
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crypt_make_salt(salt + 3, 4, 0);
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}
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/* pw_encrypt returns ptr to static */
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ret = xstrdup(pw_encrypt(newp, salt));
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/* whee, success! */
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err_ret:
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nuke_str(orig);
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if (ENABLE_FEATURE_CLEAN_UP) free(orig);
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nuke_str(newp);
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if (ENABLE_FEATURE_CLEAN_UP) free(newp);
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nuke_str(cipher);
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nuke_str(cp);
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return ret;
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}
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int passwd_main(int argc, char **argv);
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int passwd_main(int argc, char **argv)
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{
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enum {
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OPT_algo = 0x1, /* -a - password algorithm */
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OPT_lock = 0x2, /* -l - lock account */
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OPT_unlock = 0x4, /* -u - unlock account */
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OPT_delete = 0x8, /* -d - delete password */
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OPT_lud = 0xe,
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STATE_ALGO_md5 = 0x10,
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//STATE_ALGO_des = 0x20, not needed yet
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};
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unsigned opt;
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int rc;
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const char *opt_a = "";
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const char *filename;
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char *myname;
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char *name;
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char *newp;
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struct passwd *pw;
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uid_t myuid;
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struct rlimit rlimit_fsize;
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char c;
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#if ENABLE_FEATURE_SHADOWPASSWDS
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/* Using _r function to avoid pulling in static buffers */
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struct spwd spw;
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struct spwd *result;
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char buffer[256];
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#endif
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logmode = LOGMODE_BOTH;
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openlog(applet_name, LOG_NOWAIT, LOG_AUTH);
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opt = getopt32(argv, "a:lud", &opt_a);
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//argc -= optind;
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argv += optind;
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if (strcasecmp(opt_a, "des") != 0) /* -a */
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opt |= STATE_ALGO_md5;
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//else
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// opt |= STATE_ALGO_des;
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myuid = getuid();
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/* -l, -u, -d require root priv and username argument */
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if ((opt & OPT_lud) && (myuid || !argv[0]))
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bb_show_usage();
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/* Will complain and die if username not found */
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myname = xstrdup(bb_getpwuid(NULL, -1, myuid));
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name = argv[0] ? argv[0] : myname;
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pw = getpwnam(name);
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if (!pw) bb_error_msg_and_die("unknown user %s", name);
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if (myuid && pw->pw_uid != myuid) {
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/* LOGMODE_BOTH */
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bb_error_msg_and_die("%s can't change password for %s", myname, name);
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}
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#if ENABLE_FEATURE_SHADOWPASSWDS
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/* getspnam_r() can lie! Even if user isn't in shadow, it can
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* return success (pwd field was seen set to "!" in this case) */
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if (getspnam_r(pw->pw_name, &spw, buffer, sizeof(buffer), &result)
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|| LONE_CHAR(spw.sp_pwdp, '!')) {
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/* LOGMODE_BOTH */
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bb_error_msg("no record of %s in %s, using %s",
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name, bb_path_shadow_file,
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bb_path_passwd_file);
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} else {
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pw->pw_passwd = spw.sp_pwdp;
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}
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#endif
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/* Decide what the new password will be */
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newp = NULL;
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c = pw->pw_passwd[0] - '!';
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if (!(opt & OPT_lud)) {
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if (myuid && !c) { /* passwd starts with '!' */
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/* LOGMODE_BOTH */
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bb_error_msg_and_die("cannot change "
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"locked password for %s", name);
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}
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printf("Changing password for %s\n", name);
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newp = new_password(pw, myuid, opt & STATE_ALGO_md5);
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if (!newp) {
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logmode = LOGMODE_STDIO;
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bb_error_msg_and_die("password for %s is unchanged", name);
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}
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} else if (opt & OPT_lock) {
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if (!c) goto skip; /* passwd starts with '!' */
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newp = xasprintf("!%s", pw->pw_passwd);
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} else if (opt & OPT_unlock) {
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if (c) goto skip; /* not '!' */
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/* pw->pw_passwd pints to static storage,
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* strdup'ing to avoid nasty surprizes */
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newp = xstrdup(&pw->pw_passwd[1]);
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} else if (opt & OPT_delete) {
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//newp = xstrdup("");
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newp = (char*)"";
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}
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rlimit_fsize.rlim_cur = rlimit_fsize.rlim_max = 512L * 30000;
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setrlimit(RLIMIT_FSIZE, &rlimit_fsize);
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signal(SIGHUP, SIG_IGN);
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signal(SIGINT, SIG_IGN);
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signal(SIGQUIT, SIG_IGN);
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umask(077);
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xsetuid(0);
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#if ENABLE_FEATURE_SHADOWPASSWDS
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filename = bb_path_shadow_file;
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rc = update_passwd(bb_path_shadow_file, name, newp);
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if (rc == 0) /* no lines updated, no errors detected */
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#endif
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{
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filename = bb_path_passwd_file;
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rc = update_passwd(bb_path_passwd_file, name, newp);
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}
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/* LOGMODE_BOTH */
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if (rc < 0)
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bb_error_msg_and_die("cannot update password file %s",
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filename);
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bb_info_msg("Password for %s changed by %s", name, myname);
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//if (ENABLE_FEATURE_CLEAN_UP) free(newp);
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skip:
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if (!newp) {
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bb_error_msg_and_die("password for %s is already %slocked",
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name, (opt & OPT_unlock) ? "un" : "");
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}
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if (ENABLE_FEATURE_CLEAN_UP) free(myname);
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return 0;
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}
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