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/*
* SPDX-License-Identifier: ISC
*
* Copyright (c) 1994-1996, 1998-2005, 2010-2012, 2014-2015
* 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>
#if defined(HAVE_SKEY) || defined(HAVE_OPIE)
#include <sys/types.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <pwd.h>
#if defined(HAVE_SKEY)
# include <skey.h>
# define RFC1938 skey
# ifdef HAVE_RFC1938_SKEYCHALLENGE
# define rfc1938challenge(a,b,c,d) skeychallenge((a),(b),(c),(d))
# else
# define rfc1938challenge(a,b,c,d) skeychallenge((a),(b),(c))
# endif
# define rfc1938verify(a,b) skeyverify((a),(b))
#elif defined(HAVE_OPIE)
# include <opie.h>
# define RFC1938 opie
# define rfc1938challenge(a,b,c,d) opiechallenge((a),(b),(c))
# define rfc1938verify(a,b) opieverify((a),(b))
#endif
#include <sudoers.h>
#include "sudo_auth.h"
int
sudo_rfc1938_setup(const struct sudoers_context *ctx, struct passwd *pw,
char **promptp, sudo_auth *auth)
{
char challenge[256];
size_t challenge_len;
static char *orig_prompt = NULL, *new_prompt = NULL;
static size_t op_len, np_size;
static struct RFC1938 rfc1938;
debug_decl(sudo_rfc1938_setup, SUDOERS_DEBUG_AUTH);
/* Stash a pointer to the rfc1938 struct if we have not initialized */
if (!auth->data)
auth->data = &rfc1938;
/* Save the original prompt */
if (orig_prompt == NULL) {
orig_prompt = *promptp;
op_len = strlen(orig_prompt);
/* Ignore trailing colon (we will add our own) */
if (orig_prompt[op_len - 1] == ':')
op_len--;
else if (op_len >= 2 && orig_prompt[op_len - 1] == ' '
&& orig_prompt[op_len - 2] == ':')
op_len -= 2;
}
#ifdef HAVE_SKEY
/* Close old stream */
if (rfc1938.keyfile)
(void) fclose(rfc1938.keyfile);
#endif
/*
* Look up the user and get the rfc1938 challenge.
* If the user is not in the OTP db, only post a fatal error if
* we are running alone (since they may just use a normal passwd).
*/
if (rfc1938challenge(&rfc1938, pw->pw_name, challenge, sizeof(challenge))) {
if (IS_ONEANDONLY(auth)) {
sudo_warnx(U_("you do not exist in the %s database"), auth->name);
debug_return_int(AUTH_ERROR);
} else {
debug_return_int(AUTH_FAILURE);
}
}
/* Get space for new prompt with embedded challenge */
challenge_len = strlen(challenge);
if (np_size < op_len + challenge_len + 7) {
char *p = realloc(new_prompt, op_len + challenge_len + 7);
if (p == NULL) {
sudo_warnx(U_("%s: %s"), __func__, U_("unable to allocate memory"));
debug_return_int(AUTH_ERROR);
}
np_size = op_len + challenge_len + 7;
new_prompt = p;
}
if (def_long_otp_prompt)
(void) snprintf(new_prompt, np_size, "%s\n%s", challenge, orig_prompt);
else
(void) snprintf(new_prompt, np_size, "%.*s [ %s ]:", (int)op_len,
orig_prompt, challenge);
*promptp = new_prompt;
debug_return_int(AUTH_SUCCESS);
}
int
sudo_rfc1938_verify(const struct sudoers_context *ctx, struct passwd *pw,
const char *pass, sudo_auth *auth, struct sudo_conv_callback *callback)
{
debug_decl(sudo_rfc1938_verify, SUDOERS_DEBUG_AUTH);
if (rfc1938verify((struct RFC1938 *) auth->data, (char *)pass) == 0)
debug_return_int(AUTH_SUCCESS);
else
debug_return_int(AUTH_FAILURE);
}
#endif /* HAVE_SKEY || HAVE_OPIE */
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