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/*
* SPDX-License-Identifier: ISC
*
* Copyright (c) 1999-2005, 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_FWTK
#include <sys/types.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <pwd.h>
#include <auth.h>
#include <firewall.h>
#include <sudoers.h>
#include "sudo_auth.h"
int
sudo_fwtk_init(const struct sudoers_context *ctx, struct passwd *pw,
sudo_auth *auth)
{
static Cfg *confp; /* Configuration entry struct */
char resp[128]; /* Response from the server */
debug_decl(sudo_fwtk_init, SUDOERS_DEBUG_AUTH);
/* Only initialize once. */
if (auth->data != NULL)
debug_return_int(AUTH_SUCCESS);
if (IS_NONINTERACTIVE(auth))
debug_return_int(AUTH_NONINTERACTIVE);
if ((confp = cfg_read("sudo")) == (Cfg *)-1) {
sudo_warnx("%s", U_("unable to read fwtk config"));
debug_return_int(AUTH_ERROR);
}
if (auth_open(confp)) {
sudo_warnx("%s", U_("unable to connect to authentication server"));
debug_return_int(AUTH_ERROR);
}
/* Get welcome message from auth server */
if (auth_recv(resp, sizeof(resp))) {
sudo_warnx("%s", U_("lost connection to authentication server"));
debug_return_int(AUTH_ERROR);
}
if (strncmp(resp, "Authsrv ready", 13) != 0) {
sudo_warnx(U_("authentication server error:\n%s"), resp);
debug_return_int(AUTH_ERROR);
}
auth->data = (void *) confp;
debug_return_int(AUTH_SUCCESS);
}
int
sudo_fwtk_verify(const struct sudoers_context *ctx, struct passwd *pw,
const char *prompt, sudo_auth *auth, struct sudo_conv_callback *callback)
{
char *pass; /* Password from the user */
char buf[SUDO_CONV_REPL_MAX + 12]; /* General purpose buffer */
char resp[128]; /* Response from the server */
int error;
debug_decl(sudo_fwtk_verify, SUDOERS_DEBUG_AUTH);
/* Send username to authentication server. */
(void) snprintf(buf, sizeof(buf), "authorize %s 'sudo'", pw->pw_name);
restart:
if (auth_send(buf) || auth_recv(resp, sizeof(resp))) {
sudo_warnx("%s", U_("lost connection to authentication server"));
debug_return_int(AUTH_ERROR);
}
/* Get the password/response from the user. */
if (strncmp(resp, "challenge ", 10) == 0) {
(void) snprintf(buf, sizeof(buf), "%s\nResponse: ", &resp[10]);
pass = auth_getpass(buf, SUDO_CONV_PROMPT_ECHO_OFF, callback);
if (pass && *pass == '\0') {
free(pass);
pass = auth_getpass("Response [echo on]: ",
SUDO_CONV_PROMPT_ECHO_ON, callback);
}
} else if (strncmp(resp, "chalnecho ", 10) == 0) {
pass = auth_getpass(&resp[10], SUDO_CONV_PROMPT_ECHO_OFF, callback);
} else if (strncmp(resp, "password", 8) == 0) {
pass = auth_getpass(prompt, SUDO_CONV_PROMPT_ECHO_OFF, callback);
} else if (strncmp(resp, "display ", 8) == 0) {
sudo_printf(SUDO_CONV_INFO_MSG|SUDO_CONV_PREFER_TTY, "%s\n", &resp[8]);
strlcpy(buf, "response noop", sizeof(buf));
goto restart;
} else {
sudo_warnx("%s", resp);
debug_return_int(AUTH_ERROR);
}
if (pass == NULL) { /* ^C or error */
debug_return_int(AUTH_INTR);
}
/* Send the user's response to the server */
(void) snprintf(buf, sizeof(buf), "response '%s'", pass);
if (auth_send(buf) || auth_recv(resp, sizeof(resp))) {
sudo_warnx("%s", U_("lost connection to authentication server"));
error = AUTH_ERROR;
goto done;
}
if (strncmp(resp, "ok", 2) == 0) {
error = AUTH_SUCCESS;
goto done;
}
/* Main loop prints "Permission Denied" or insult. */
if (strcmp(resp, "Permission Denied.") != 0)
sudo_warnx("%s", resp);
error = AUTH_FAILURE;
done:
explicit_bzero(buf, sizeof(buf));
freezero(pass, strlen(pass));
debug_return_int(error);
}
int
sudo_fwtk_cleanup(const struct sudoers_context *ctx, struct passwd *pw,
sudo_auth *auth, bool force)
{
debug_decl(sudo_fwtk_cleanup, SUDOERS_DEBUG_AUTH);
auth_close();
debug_return_int(AUTH_SUCCESS);
}
#endif /* HAVE_FWTK */
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