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/*
* SPDX-License-Identifier: ISC
*
* Copyright (c) 2000-2005, 2007-2008, 2010-2015
* Todd C. Miller <Todd.Miller@sudo.ws>
*
* 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 <config.h>
#ifdef HAVE_BSD_AUTH_H
#include <sys/types.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <ctype.h>
#include <pwd.h>
#include <signal.h>
#include <login_cap.h>
#include <bsd_auth.h>
#include <sudoers.h>
#include "sudo_auth.h"
# ifndef LOGIN_DEFROOTCLASS
# define LOGIN_DEFROOTCLASS "daemon"
# endif
struct bsdauth_state {
auth_session_t *as;
login_cap_t *lc;
};
static char *login_style; /* user may set style via -a option */
int
bsdauth_init(const struct sudoers_context *ctx, struct passwd *pw,
sudo_auth *auth)
{
static struct bsdauth_state state;
debug_decl(bsdauth_init, SUDOERS_DEBUG_AUTH);
/* Only initialize once. */
if (auth->data != NULL)
debug_return_int(AUTH_SUCCESS);
/* Get login class based on auth user, which may not be invoking user. */
if (pw->pw_class && *pw->pw_class) {
state.lc = login_getclass(pw->pw_class);
} else {
state.lc = login_getclass(
pw->pw_uid ? (char *)LOGIN_DEFCLASS : (char *)LOGIN_DEFROOTCLASS);
}
if (state.lc == NULL) {
log_warning(ctx, 0, N_("unable to get login class for user %s"),
pw->pw_name);
goto bad;
}
login_style = login_getstyle(state.lc, login_style, (char *)"auth-sudo");
if (login_style == NULL) {
log_warningx(ctx, 0, N_("invalid authentication type"));
goto bad;
}
if ((state.as = auth_open()) == NULL) {
log_warning(ctx, 0, N_("unable to begin BSD authentication"));
goto bad;
}
if (auth_setitem(state.as, AUTHV_STYLE, login_style) < 0 ||
auth_setitem(state.as, AUTHV_NAME, pw->pw_name) < 0 ||
auth_setitem(state.as, AUTHV_CLASS, ctx->runas.class) < 0) {
log_warningx(ctx, 0, N_("unable to initialize BSD authentication"));
goto bad;
}
auth->data = (void *) &state;
debug_return_int(AUTH_SUCCESS);
bad:
auth_close(state.as);
login_close(state.lc);
debug_return_int(AUTH_ERROR);
}
int
bsdauth_verify(const struct sudoers_context *ctx, struct passwd *pw,
const char *prompt, sudo_auth *auth, struct sudo_conv_callback *callback)
{
char *pass;
char *s;
size_t len;
int authok = 0;
struct sigaction sa, osa;
auth_session_t *as = ((struct bsdauth_state *) auth->data)->as;
debug_decl(bsdauth_verify, SUDOERS_DEBUG_AUTH);
if (IS_NONINTERACTIVE(auth))
debug_return_int(AUTH_NONINTERACTIVE);
/* save old signal handler */
sigemptyset(&sa.sa_mask);
sa.sa_flags = SA_RESTART;
sa.sa_handler = SIG_DFL;
(void) sigaction(SIGCHLD, &sa, &osa);
/*
* If there is a challenge then print that instead of the normal
* prompt. If the user just hits return we prompt again with echo
* turned on, which is useful for challenge/response things like
* S/Key.
*/
if ((s = auth_challenge(as)) == NULL) {
pass = auth_getpass(prompt, SUDO_CONV_PROMPT_ECHO_OFF, callback);
} else {
pass = auth_getpass(s, SUDO_CONV_PROMPT_ECHO_OFF, callback);
if (pass != NULL && *pass == '\0') {
if ((prompt = strrchr(s, '\n')))
prompt++;
else
prompt = s;
/*
* Append '[echo on]' to the last line of the challenge and
* re-prompt with echo turned on.
*/
len = strlen(prompt);
while (len > 0 && (isspace((unsigned char)prompt[len - 1]) || prompt[len - 1] == ':'))
len--;
if (asprintf(&s, "%.*s [echo on]: ", (int)len, prompt) == -1) {
log_warningx(ctx, 0, N_("unable to allocate memory"));
debug_return_int(AUTH_ERROR);
}
free(pass);
pass = auth_getpass(s, SUDO_CONV_PROMPT_ECHO_ON, callback);
free(s);
}
}
if (pass != NULL) {
authok = auth_userresponse(as, pass, 1);
freezero(pass, strlen(pass));
}
/* restore old signal handler */
(void) sigaction(SIGCHLD, &osa, NULL);
if (authok)
debug_return_int(AUTH_SUCCESS);
if (pass == NULL)
debug_return_int(AUTH_INTR);
if ((s = auth_getvalue(as, (char *)"errormsg")) != NULL)
log_warningx(ctx, 0, "%s", s);
debug_return_int(AUTH_FAILURE);
}
int
bsdauth_approval(const struct sudoers_context *ctx, struct passwd *pw,
sudo_auth *auth, bool exempt)
{
struct bsdauth_state *state = auth->data;
debug_decl(bsdauth_approval, SUDOERS_DEBUG_AUTH);
if (auth_approval(state->as, state->lc, pw->pw_name, (char *)"auth-sudo") == 0) {
if (auth_getstate(state->as) & AUTH_EXPIRED)
log_warningx(ctx, 0, "%s", N_("your account has expired"));
else
log_warningx(ctx, 0, "%s", N_("approval failed"));
debug_return_int(AUTH_FAILURE);
}
debug_return_int(AUTH_SUCCESS);
}
int
bsdauth_cleanup(const struct sudoers_context *ctx, struct passwd *pw,
sudo_auth *auth, bool force)
{
struct bsdauth_state *state = auth->data;
debug_decl(bsdauth_cleanup, SUDOERS_DEBUG_AUTH);
if (state != NULL) {
auth_close(state->as);
state->as = NULL;
login_close(state->lc);
state->lc = NULL;
auth->data = NULL;
}
login_style = NULL;
debug_return_int(AUTH_SUCCESS);
}
void
bsdauth_set_style(const char *style)
{
login_style = (char *)style;
}
#endif /* HAVE_BSD_AUTH_H */
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