142 lines
3.5 KiB
C
142 lines
3.5 KiB
C
/*
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* Copyright (c) 2013-2017 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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* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
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* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <config.h>
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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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#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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#if defined(HAVE_STDINT_H)
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# include <stdint.h>
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#elif defined(HAVE_INTTYPES_H)
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# include <inttypes.h>
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#endif
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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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#ifdef HAVE_SHA224UPDATE
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# include <sha2.h>
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#else
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# include "compat/sha2.h"
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#endif
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static struct digest_function {
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const unsigned int digest_len;
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void (*init)(SHA2_CTX *);
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#ifdef SHA2_VOID_PTR
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void (*update)(SHA2_CTX *, const void *, size_t);
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void (*final)(void *, SHA2_CTX *);
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#else
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void (*update)(SHA2_CTX *, const unsigned char *, size_t);
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void (*final)(unsigned char *, SHA2_CTX *);
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#endif
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} digest_functions[] = {
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{
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SHA224_DIGEST_LENGTH,
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SHA224Init,
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SHA224Update,
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SHA224Final
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}, {
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SHA256_DIGEST_LENGTH,
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SHA256Init,
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SHA256Update,
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SHA256Final
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}, {
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SHA384_DIGEST_LENGTH,
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SHA384Init,
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SHA384Update,
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SHA384Final
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}, {
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SHA512_DIGEST_LENGTH,
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SHA512Init,
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SHA512Update,
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SHA512Final
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}, {
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0
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}
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};
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unsigned char *
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sudo_filedigest(int fd, const char *file, int digest_type, size_t *digest_len)
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{
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struct digest_function *func = NULL;
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unsigned char *file_digest = NULL;
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unsigned char buf[32 * 1024];
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size_t nread;
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SHA2_CTX ctx;
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int i, fd2;
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FILE *fp = NULL;
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debug_decl(sudo_filedigest, SUDOERS_DEBUG_UTIL)
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for (i = 0; digest_functions[i].digest_len != 0; i++) {
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if (digest_type == i) {
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func = &digest_functions[i];
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break;
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}
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}
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if (func == NULL) {
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sudo_warnx(U_("unsupported digest type %d for %s"), digest_type, file);
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goto bad;
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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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goto bad;
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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(func->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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func->init(&ctx);
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while ((nread = fread(buf, 1, sizeof(buf), fp)) != 0) {
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func->update(&ctx, 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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func->final(file_digest, &ctx);
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fclose(fp);
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*digest_len = func->digest_len;
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debug_return_ptr(file_digest);
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bad:
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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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