mirror of https://github.com/sudo-project/sudo.git
92 lines
2.7 KiB
C
92 lines
2.7 KiB
C
/*
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* SPDX-License-Identifier: ISC
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*
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* Copyright (c) 2013-2018 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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/*
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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 <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 <fcntl.h>
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#include <errno.h>
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#include <sudoers.h>
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#include <sudo_digest.h>
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unsigned char *
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sudo_filedigest(int fd, const char *file, unsigned int digest_type,
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size_t *digest_len)
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{
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unsigned char *file_digest = NULL;
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unsigned char buf[32 * 1024];
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struct sudo_digest *dig = NULL;
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FILE *fp = NULL;
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size_t nread;
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int fd2;
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debug_decl(sudo_filedigest, SUDOERS_DEBUG_UTIL);
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*digest_len = sudo_digest_getlen(digest_type);
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if (*digest_len == 0) {
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sudo_warnx(U_("unsupported digest type %u for %s"), digest_type, file);
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debug_return_ptr(NULL);
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}
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if ((fd2 = dup(fd)) == -1) {
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sudo_debug_printf(SUDO_DEBUG_INFO, "unable to dup %s: %s",
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file, strerror(errno));
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debug_return_ptr(NULL);
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}
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if ((fp = fdopen(fd2, "r")) == NULL) {
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sudo_debug_printf(SUDO_DEBUG_INFO, "unable to fdopen %s: %s",
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file, strerror(errno));
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close(fd2);
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goto bad;
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}
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if ((file_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 bad;
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}
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if ((dig = sudo_digest_alloc(digest_type)) == NULL) {
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sudo_warnx(U_("%s: %s"), __func__, U_("unable to allocate memory"));
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goto bad;
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}
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while ((nread = fread(buf, 1, sizeof(buf), fp)) != 0) {
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sudo_digest_update(dig, buf, nread);
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}
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if (ferror(fp)) {
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sudo_warnx(U_("%s: read error"), file);
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goto bad;
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}
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sudo_digest_final(dig, file_digest);
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sudo_digest_free(dig);
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fclose(fp);
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debug_return_ptr(file_digest);
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bad:
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sudo_digest_free(dig);
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free(file_digest);
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if (fp != NULL)
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fclose(fp);
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debug_return_ptr(NULL);
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}
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