a7137a5225
We still want to match the command even if it doesn't exist so that the NOPASSWD flag on sudoers entries with non-existant paths works as expected. Bug #888.
110 lines
3.4 KiB
C
110 lines
3.4 KiB
C
/*
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* SPDX-License-Identifier: ISC
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*
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* Copyright (c) 1996, 1998-2005, 2007-2019
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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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#include <sys/types.h>
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#include <sys/stat.h>
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#include <stdio.h>
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#include <stdlib.h>
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#ifdef HAVE_STRING_H
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# include <string.h>
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#endif /* HAVE_STRING_H */
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#ifdef HAVE_STRINGS_H
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# include <strings.h>
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#endif /* HAVE_STRINGS_H */
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#include <unistd.h>
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#include "sudoers.h"
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#include <gram.h>
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bool
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digest_matches(int fd, const char *file, const struct command_digest *digest)
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{
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unsigned char *file_digest = NULL;
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unsigned char *sudoers_digest = NULL;
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bool matched = false;
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size_t digest_len;
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debug_decl(digest_matches, SUDOERS_DEBUG_MATCH)
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if (fd == -1)
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goto done;
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file_digest = sudo_filedigest(fd, file, digest->digest_type, &digest_len);
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if (lseek(fd, (off_t)0, SEEK_SET) == -1) {
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sudo_debug_printf(SUDO_DEBUG_ERROR|SUDO_DEBUG_ERRNO|SUDO_DEBUG_LINENO,
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"unable to rewind digest fd");
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}
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if (file_digest == NULL) {
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/* Warning (if any) printed by sudo_filedigest() */
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goto done;
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}
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/* Convert the command digest from ascii to binary. */
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if ((sudoers_digest = malloc(digest_len)) == NULL) {
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sudo_warnx(U_("%s: %s"), __func__, U_("unable to allocate memory"));
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goto done;
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}
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if (strlen(digest->digest_str) == digest_len * 2) {
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/* Convert ascii hex to binary. */
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unsigned int i;
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for (i = 0; i < digest_len; i++) {
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const int h = hexchar(&digest->digest_str[i + i]);
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if (h == -1)
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goto bad_format;
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sudoers_digest[i] = (unsigned char)h;
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}
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} else {
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/* Convert base64 to binary. */
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size_t len = base64_decode(digest->digest_str, sudoers_digest, digest_len);
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if (len != digest_len) {
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sudo_debug_printf(SUDO_DEBUG_ERROR|SUDO_DEBUG_LINENO,
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"incorrect length for digest, expected %zu, got %zu",
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digest_len, len);
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goto bad_format;
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}
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}
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if (memcmp(file_digest, sudoers_digest, digest_len) == 0) {
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matched = true;
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} else {
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sudo_debug_printf(SUDO_DEBUG_DIAG|SUDO_DEBUG_LINENO,
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"%s digest mismatch for %s, expecting %s",
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digest_type_to_name(digest->digest_type), file, digest->digest_str);
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}
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goto done;
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bad_format:
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sudo_warnx(U_("digest for %s (%s) is not in %s form"), file,
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digest->digest_str, digest_type_to_name(digest->digest_type));
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done:
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free(sudoers_digest);
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free(file_digest);
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debug_return_bool(matched);
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}
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