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