mirror of https://github.com/sudo-project/sudo.git
142 lines
4.3 KiB
C
142 lines
4.3 KiB
C
/*
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* SPDX-License-Identifier: ISC
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*
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* Copyright (c) 1994-1996, 1998-2005, 2010-2012, 2014-2015
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* 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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#if defined(HAVE_SKEY) || defined(HAVE_OPIE)
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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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#if defined(HAVE_SKEY)
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# include <skey.h>
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# define RFC1938 skey
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# ifdef HAVE_RFC1938_SKEYCHALLENGE
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# define rfc1938challenge(a,b,c,d) skeychallenge((a),(b),(c),(d))
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# else
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# define rfc1938challenge(a,b,c,d) skeychallenge((a),(b),(c))
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# endif
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# define rfc1938verify(a,b) skeyverify((a),(b))
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#elif defined(HAVE_OPIE)
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# include <opie.h>
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# define RFC1938 opie
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# define rfc1938challenge(a,b,c,d) opiechallenge((a),(b),(c))
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# define rfc1938verify(a,b) opieverify((a),(b))
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#endif
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#include <sudoers.h>
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#include "sudo_auth.h"
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int
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sudo_rfc1938_setup(const struct sudoers_context *ctx, struct passwd *pw,
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char **promptp, sudo_auth *auth)
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{
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char challenge[256];
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size_t challenge_len;
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static char *orig_prompt = NULL, *new_prompt = NULL;
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static size_t op_len, np_size;
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static struct RFC1938 rfc1938;
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debug_decl(sudo_rfc1938_setup, SUDOERS_DEBUG_AUTH);
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/* Stash a pointer to the rfc1938 struct if we have not initialized */
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if (!auth->data)
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auth->data = &rfc1938;
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/* Save the original prompt */
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if (orig_prompt == NULL) {
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orig_prompt = *promptp;
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op_len = strlen(orig_prompt);
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/* Ignore trailing colon (we will add our own) */
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if (orig_prompt[op_len - 1] == ':')
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op_len--;
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else if (op_len >= 2 && orig_prompt[op_len - 1] == ' '
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&& orig_prompt[op_len - 2] == ':')
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op_len -= 2;
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}
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#ifdef HAVE_SKEY
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/* Close old stream */
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if (rfc1938.keyfile)
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(void) fclose(rfc1938.keyfile);
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#endif
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/*
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* Look up the user and get the rfc1938 challenge.
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* If the user is not in the OTP db, only post a fatal error if
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* we are running alone (since they may just use a normal passwd).
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*/
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if (rfc1938challenge(&rfc1938, pw->pw_name, challenge, sizeof(challenge))) {
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if (IS_ONEANDONLY(auth)) {
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sudo_warnx(U_("you do not exist in the %s database"), auth->name);
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debug_return_int(AUTH_ERROR);
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} else {
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debug_return_int(AUTH_FAILURE);
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}
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}
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/* Get space for new prompt with embedded challenge */
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challenge_len = strlen(challenge);
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if (np_size < op_len + challenge_len + 7) {
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char *p = realloc(new_prompt, op_len + challenge_len + 7);
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if (p == NULL) {
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sudo_warnx(U_("%s: %s"), __func__, U_("unable to allocate memory"));
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debug_return_int(AUTH_ERROR);
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}
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np_size = op_len + challenge_len + 7;
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new_prompt = p;
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}
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if (def_long_otp_prompt)
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(void) snprintf(new_prompt, np_size, "%s\n%s", challenge, orig_prompt);
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else
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(void) snprintf(new_prompt, np_size, "%.*s [ %s ]:", (int)op_len,
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orig_prompt, challenge);
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*promptp = new_prompt;
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debug_return_int(AUTH_SUCCESS);
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}
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int
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sudo_rfc1938_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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debug_decl(sudo_rfc1938_verify, SUDOERS_DEBUG_AUTH);
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if (rfc1938verify((struct RFC1938 *) auth->data, (char *)pass) == 0)
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debug_return_int(AUTH_SUCCESS);
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else
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debug_return_int(AUTH_FAILURE);
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}
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#endif /* HAVE_SKEY || HAVE_OPIE */
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