/*
* Copyright (c) 1999-2005, 2008, 2010-2012
* Todd C. Miller <Todd.Miller@courtesan.com>
*
* 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.
*/
#include <config.h>
#include <sys/types.h>
#include <stdio.h>
#ifdef STDC_HEADERS
# include <stdlib.h>
# include <stddef.h>
#else
# ifdef HAVE_STDLIB_H
# include <stdlib.h>
# endif
#endif /* STDC_HEADERS */
#ifdef HAVE_STRING_H
# include <string.h>
#endif /* HAVE_STRING_H */
#ifdef HAVE_STRINGS_H
# include <strings.h>
#endif /* HAVE_STRING_H */
#ifdef HAVE_UNISTD_H
# include <unistd.h>
#endif /* HAVE_UNISTD_H */
#include <pwd.h>
#include <auth.h>
#include <firewall.h>
#include "sudoers.h"
#include "sudo_auth.h"
int
sudo_fwtk_init(struct passwd *pw, sudo_auth *auth)
{
static Cfg *confp; /* Configuration entry struct */
char resp[128]; /* Response from the server */
debug_decl(sudo_fwtk_init, SUDO_DEBUG_AUTH)
if ((confp = cfg_read("sudo")) == (Cfg *)-1) {
warningx(_("unable to read fwtk config"));
debug_return_int(AUTH_FATAL);
}
if (auth_open(confp)) {
warningx(_("unable to connect to authentication server"));
debug_return_int(AUTH_FATAL);
}
/* Get welcome message from auth server */
if (auth_recv(resp, sizeof(resp))) {
warningx(_("lost connection to authentication server"));
debug_return_int(AUTH_FATAL);
}
if (strncmp(resp, "Authsrv ready", 13) != 0) {
warningx(_("authentication server error:\n%s"), resp);
debug_return_int(AUTH_FATAL);
}
debug_return_int(AUTH_SUCCESS);
}
int
sudo_fwtk_verify(struct passwd *pw, char *prompt, sudo_auth *auth)
{
char *pass; /* Password from the user */
char buf[SUDO_PASS_MAX + 12]; /* General prupose buffer */
char resp[128]; /* Response from the server */
int error;
debug_decl(sudo_fwtk_verify, SUDO_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))) {
warningx(_("lost connection to authentication server"));
debug_return_int(AUTH_FATAL);
}
/* 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, def_passwd_timeout * 60, SUDO_CONV_PROMPT_ECHO_OFF);
if (pass && *pass == '\0') {
pass = auth_getpass("Response [echo on]: ",
def_passwd_timeout * 60, SUDO_CONV_PROMPT_ECHO_ON);
}
} else if (strncmp(resp, "chalnecho ", 10) == 0) {
pass = auth_getpass(&resp[10], def_passwd_timeout * 60,
SUDO_CONV_PROMPT_ECHO_OFF);
} else if (strncmp(resp, "password", 8) == 0) {
pass = auth_getpass(prompt, def_passwd_timeout * 60,
SUDO_CONV_PROMPT_ECHO_OFF);
} else if (strncmp(resp, "display ", 8) == 0) {
fprintf(stderr, "%s\n", &resp[8]);
strlcpy(buf, "response dummy", sizeof(buf));
goto restart;
} else {
warningx("%s", resp);
debug_return_int(AUTH_FATAL);
}
if (!pass) { /* ^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))) {
warningx(_("lost connection to authentication server"));
error = AUTH_FATAL;
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)
warningx("%s", resp);
error = AUTH_FAILURE;
done:
zero_bytes(pass, strlen(pass));
zero_bytes(buf, strlen(buf));
debug_return_int(error);
}
int
sudo_fwtk_cleanup(struct passwd *pw, sudo_auth *auth)
{
debug_decl(sudo_fwtk_cleanup, SUDO_DEBUG_AUTH)
auth_close();
debug_return_int(AUTH_SUCCESS);
}
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