/* * SPDX-License-Identifier: ISC * * Copyright (c) 1999-2005, 2010-2015 Todd C. Miller * * Permission to use, copy, modify, and distribute this software for any * purpose with or without fee is hereby granted, provided that the above * copyright notice and this permission notice appear in all copies. * * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. * * Sponsored in part by the Defense Advanced Research Projects * Agency (DARPA) and Air Force Research Laboratory, Air Force * Materiel Command, USAF, under agreement number F39502-99-1-0512. */ /* * This is an open source non-commercial project. Dear PVS-Studio, please check it. * PVS-Studio Static Code Analyzer for C, C++ and C#: http://www.viva64.com */ #include #include #include #include #include #include #include #include "sudoers.h" #include "sudo_auth.h" #define DESLEN 13 #define HAS_AGEINFO(p, l) (l == 18 && p[DESLEN] == ',') int sudo_passwd_init(struct passwd *pw, sudo_auth *auth) { debug_decl(sudo_passwd_init, SUDOERS_DEBUG_AUTH); /* Only initialize once. */ if (auth->data != NULL) debug_return_int(AUTH_SUCCESS); #ifdef HAVE_SKEYACCESS if (skeyaccess(pw, user_tty, NULL, NULL) == 0) debug_return_int(AUTH_FAILURE); #endif sudo_setspent(); auth->data = sudo_getepw(pw); sudo_endspent(); debug_return_int(auth->data ? AUTH_SUCCESS : AUTH_FATAL); } #ifdef HAVE_CRYPT int sudo_passwd_verify(struct passwd *pw, const char *pass, sudo_auth *auth, struct sudo_conv_callback *callback) { char des_pass[9], *epass; char *pw_epasswd = auth->data; size_t pw_len; int matched = 0; debug_decl(sudo_passwd_verify, SUDOERS_DEBUG_AUTH); /* An empty plain-text password must match an empty encrypted password. */ if (pass[0] == '\0') debug_return_int(pw_epasswd[0] ? AUTH_FAILURE : AUTH_SUCCESS); /* * Truncate to 8 chars if standard DES since not all crypt()'s do this. */ pw_len = strlen(pw_epasswd); if (pw_len == DESLEN || HAS_AGEINFO(pw_epasswd, pw_len)) { strlcpy(des_pass, pass, sizeof(des_pass)); pass = des_pass; } /* * Normal UN*X password check. * HP-UX may add aging info (separated by a ',') at the end so * only compare the first DESLEN characters in that case. */ epass = (char *) crypt(pass, pw_epasswd); if (epass != NULL) { if (HAS_AGEINFO(pw_epasswd, pw_len) && strlen(epass) == DESLEN) matched = !strncmp(pw_epasswd, epass, DESLEN); else matched = !strcmp(pw_epasswd, epass); } explicit_bzero(des_pass, sizeof(des_pass)); debug_return_int(matched ? AUTH_SUCCESS : AUTH_FAILURE); } #else int sudo_passwd_verify(struct passwd *pw, const char *pass, sudo_auth *auth, struct sudo_conv_callback *callback) { char *pw_passwd = auth->data; int matched; debug_decl(sudo_passwd_verify, SUDOERS_DEBUG_AUTH); /* Simple string compare for systems without crypt(). */ matched = !strcmp(pass, pw_passwd); debug_return_int(matched ? AUTH_SUCCESS : AUTH_FAILURE); } #endif int sudo_passwd_cleanup(struct passwd *pw, sudo_auth *auth, bool force) { debug_decl(sudo_passwd_cleanup, SUDOERS_DEBUG_AUTH); if (auth->data != NULL) { /* Zero out encrypted password before freeing. */ size_t len = strlen((char *)auth->data); freezero(auth->data, len); auth->data = NULL; } debug_return_int(AUTH_SUCCESS); }