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275 lines
6.5 KiB
C
275 lines
6.5 KiB
C
/*-
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* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
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*
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* Copyright (c) 2014 The FreeBSD Foundation
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* All rights reserved.
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*
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* This software was developed by Edward Tomasz Napierala under sponsorship
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* from the FreeBSD Foundation.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/param.h>
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#include <sys/capsicum.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <assert.h>
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#include <capsicum_helpers.h>
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#include <err.h>
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#include <errno.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 <openssl/evp.h>
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#include <openssl/err.h>
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#include <openssl/pem.h>
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#include "uefisign.h"
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static void
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load(struct executable *x)
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{
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int error, fd;
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struct stat sb;
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char *buf;
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size_t nread, len;
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fd = fileno(x->x_fp);
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error = fstat(fd, &sb);
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if (error != 0)
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err(1, "%s: fstat", x->x_path);
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len = sb.st_size;
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if (len <= 0)
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errx(1, "%s: file is empty", x->x_path);
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buf = malloc(len);
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if (buf == NULL)
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err(1, "%s: cannot malloc %zd bytes", x->x_path, len);
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nread = fread(buf, len, 1, x->x_fp);
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if (nread != 1)
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err(1, "%s: fread", x->x_path);
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x->x_buf = buf;
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x->x_len = len;
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}
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static void
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digest_range(struct executable *x, EVP_MD_CTX *mdctx, off_t off, size_t len)
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{
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int ok;
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range_check(x, off, len, "chunk");
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ok = EVP_DigestUpdate(mdctx, x->x_buf + off, len);
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if (ok == 0) {
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ERR_print_errors_fp(stderr);
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errx(1, "EVP_DigestUpdate(3) failed");
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}
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}
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static void
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digest(struct executable *x)
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{
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EVP_MD_CTX *mdctx;
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const EVP_MD *md;
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size_t sum_of_bytes_hashed;
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int i, ok;
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/*
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* Windows Authenticode Portable Executable Signature Format
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* spec version 1.0 specifies MD5 and SHA1. However, pesign
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* and sbsign both use SHA256, so do the same.
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*/
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md = EVP_get_digestbyname(DIGEST);
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if (md == NULL) {
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ERR_print_errors_fp(stderr);
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errx(1, "EVP_get_digestbyname(\"%s\") failed", DIGEST);
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}
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mdctx = EVP_MD_CTX_create();
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if (mdctx == NULL) {
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ERR_print_errors_fp(stderr);
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errx(1, "EVP_MD_CTX_create(3) failed");
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}
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ok = EVP_DigestInit_ex(mdctx, md, NULL);
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if (ok == 0) {
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ERR_print_errors_fp(stderr);
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errx(1, "EVP_DigestInit_ex(3) failed");
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}
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/*
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* According to the Authenticode spec, we need to compute
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* the digest in a rather... specific manner; see "Calculating
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* the PE Image Hash" part of the spec for details.
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*
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* First, everything from 0 to before the PE checksum.
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*/
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digest_range(x, mdctx, 0, x->x_checksum_off);
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/*
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* Second, from after the PE checksum to before the Certificate
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* entry in Data Directory.
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*/
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digest_range(x, mdctx, x->x_checksum_off + x->x_checksum_len,
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x->x_certificate_entry_off -
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(x->x_checksum_off + x->x_checksum_len));
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/*
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* Then, from after the Certificate entry to the end of headers.
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*/
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digest_range(x, mdctx,
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x->x_certificate_entry_off + x->x_certificate_entry_len,
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x->x_headers_len -
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(x->x_certificate_entry_off + x->x_certificate_entry_len));
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/*
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* Then, each section in turn, as specified in the PE Section Table.
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*
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* XXX: Sorting.
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*/
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sum_of_bytes_hashed = x->x_headers_len;
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for (i = 0; i < x->x_nsections; i++) {
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digest_range(x, mdctx,
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x->x_section_off[i], x->x_section_len[i]);
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sum_of_bytes_hashed += x->x_section_len[i];
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}
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/*
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* I believe this can happen with overlapping sections.
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*/
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if (sum_of_bytes_hashed > x->x_len)
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errx(1, "number of bytes hashed is larger than file size");
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/*
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* I can't really explain this one; just do what the spec says.
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*/
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if (sum_of_bytes_hashed < x->x_len) {
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digest_range(x, mdctx, sum_of_bytes_hashed,
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x->x_len - (signature_size(x) + sum_of_bytes_hashed));
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}
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ok = EVP_DigestFinal_ex(mdctx, x->x_digest, &x->x_digest_len);
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if (ok == 0) {
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ERR_print_errors_fp(stderr);
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errx(1, "EVP_DigestFinal_ex(3) failed");
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}
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EVP_MD_CTX_destroy(mdctx);
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}
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static void
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show_digest(const struct executable *x)
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{
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int i;
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printf("computed %s digest ", DIGEST);
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for (i = 0; i < (int)x->x_digest_len; i++)
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printf("%02x", (unsigned char)x->x_digest[i]);
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printf("; digest len %u\n", x->x_digest_len);
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}
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static void
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send_digest(const struct executable *x, int pipefd)
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{
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send_chunk(x->x_digest, x->x_digest_len, pipefd);
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}
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static void
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receive_signature(struct executable *x, int pipefd)
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{
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receive_chunk(&x->x_signature, &x->x_signature_len, pipefd);
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}
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static void
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save(struct executable *x, FILE *fp, const char *path)
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{
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size_t nwritten;
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assert(fp != NULL);
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assert(path != NULL);
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nwritten = fwrite(x->x_buf, x->x_len, 1, fp);
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if (nwritten != 1)
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err(1, "%s: fwrite", path);
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}
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int
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child(const char *inpath, const char *outpath, int pipefd,
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bool Vflag, bool vflag)
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{
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FILE *outfp = NULL, *infp = NULL;
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struct executable *x;
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infp = checked_fopen(inpath, "r");
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if (outpath != NULL)
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outfp = checked_fopen(outpath, "w");
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if (caph_enter() < 0)
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err(1, "cap_enter");
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x = calloc(1, sizeof(*x));
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if (x == NULL)
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err(1, "calloc");
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x->x_path = inpath;
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x->x_fp = infp;
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load(x);
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parse(x);
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if (Vflag) {
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if (signature_size(x) == 0)
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errx(1, "file not signed");
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printf("file contains signature\n");
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if (vflag) {
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digest(x);
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show_digest(x);
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show_certificate(x);
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}
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} else {
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if (signature_size(x) != 0)
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errx(1, "file already signed");
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digest(x);
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if (vflag)
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show_digest(x);
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send_digest(x, pipefd);
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receive_signature(x, pipefd);
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update(x);
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save(x, outfp, outpath);
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}
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return (0);
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}
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