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