Blame src/libimaevm.c

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/*
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 * ima-evm-utils - IMA/EVM support utilities
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 *
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 * Copyright (C) 2011 Nokia Corporation
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 * Copyright (C) 2011,2012,2013 Intel Corporation
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 * Copyright (C) 2013,2014 Samsung Electronics
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 *
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 * Authors:
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 * Dmitry Kasatkin <dmitry.kasatkin@nokia.com>
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 *                 <dmitry.kasatkin@intel.com>
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 *                 <d.kasatkin@samsung.com>
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 *
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 * This program is free software; you can redistribute it and/or
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 * modify it under the terms of the GNU General Public License
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 * version 2 as published by the Free Software Foundation.
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 *
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 * This program is distributed in the hope that it will be useful,
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 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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 * GNU General Public License for more details.
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 *
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 * You should have received a copy of the GNU General Public License
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 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
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 *
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 * As a special exception, the copyright holders give permission to link the
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 * code of portions of this program with the OpenSSL library under certain
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 * conditions as described in each individual source file and distribute
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 * linked combinations including the program with the OpenSSL library. You
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 * must comply with the GNU General Public License in all respects
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 * for all of the code used other than as permitted herein. If you modify
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 * file(s) with this exception, you may extend this exception to your
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 * version of the file(s), but you are not obligated to do so. If you do not
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 * wish to do so, delete this exception statement from your version. If you
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 * delete this exception statement from all source files in the program,
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 * then also delete it in the license file.
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 *
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 * File: libimaevm.c
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 *	 IMA/EVM library
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 */
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/* should we use logger instead for library? */
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#define USE_FPRINTF
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#include <sys/types.h>
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#include <sys/param.h>
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#include <sys/stat.h>
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#include <asm/byteorder.h>
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#include <unistd.h>
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#include <dirent.h>
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#include <string.h>
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#include <stdio.h>
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#include <assert.h>
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#include <ctype.h>
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#include <openssl/crypto.h>
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#include <openssl/pem.h>
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#include <openssl/evp.h>
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#include <openssl/x509.h>
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#include <openssl/err.h>
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#include "imaevm.h"
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#include "hash_info.h"
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/* Names that are primary for OpenSSL. */
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static const char *const pkey_hash_algo[PKEY_HASH__LAST] = {
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	[PKEY_HASH_MD4]		= "md4",
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	[PKEY_HASH_MD5]		= "md5",
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	[PKEY_HASH_SHA1]	= "sha1",
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	[PKEY_HASH_RIPE_MD_160]	= "rmd160",
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	[PKEY_HASH_SHA256]	= "sha256",
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	[PKEY_HASH_SHA384]	= "sha384",
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	[PKEY_HASH_SHA512]	= "sha512",
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	[PKEY_HASH_SHA224]	= "sha224",
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	[PKEY_HASH_SM3_256]	= "sm3",
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	[PKEY_HASH_STREEBOG_256] = "md_gost12_256",
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	[PKEY_HASH_STREEBOG_512] = "md_gost12_512",
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};
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/* Names that are primary for the kernel. */
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static const char *const pkey_hash_algo_kern[PKEY_HASH__LAST] = {
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	[PKEY_HASH_STREEBOG_256] = "streebog256",
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	[PKEY_HASH_STREEBOG_512] = "streebog512",
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};
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struct libimaevm_params imaevm_params = {
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	.verbose = LOG_INFO,
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	.x509 = 1,
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	.hash_algo = "sha1",
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};
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static void __attribute__ ((constructor)) libinit(void);
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void imaevm_do_hexdump(FILE *fp, const void *ptr, int len, bool cr)
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{
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	int i;
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	uint8_t *data = (uint8_t *) ptr;
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	for (i = 0; i < len; i++)
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		fprintf(fp, "%02x", data[i]);
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	if (cr)
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		fprintf(fp, "\n");
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}
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void imaevm_hexdump(const void *ptr, int len)
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{
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	imaevm_do_hexdump(stdout, ptr, len, true);
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}
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const char *imaevm_hash_algo_by_id(int algo)
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{
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	if (algo < PKEY_HASH__LAST)
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		return pkey_hash_algo[algo];
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	if (algo < HASH_ALGO__LAST)
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		return hash_algo_name[algo];
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	log_err("digest %d not found\n", algo);
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	return NULL;
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}
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/* Output all remaining openssl error messages. */
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static void output_openssl_errors(void)
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{
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	while (ERR_peek_error()) {
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		char buf[256];
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		/* buf must be at least 256 bytes long according to man */
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		ERR_error_string(ERR_get_error(), buf);
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		log_err("openssl: %s\n", buf);
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	}
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}
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static int add_file_hash(const char *file, EVP_MD_CTX *ctx)
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{
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	uint8_t *data;
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	int err = -1, bs = DATA_SIZE;
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	off_t size, len;
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	FILE *fp;
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	struct stat stats;
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	fp = fopen(file, "r");
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	if (!fp) {
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		log_err("Failed to open: %s\n", file);
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		return -1;
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	}
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	data = malloc(bs);
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	if (!data) {
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		log_err("malloc failed\n");
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		goto out;
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	}
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	if (fstat(fileno(fp), &stats) == -1) {
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		log_err("Failed to fstat: %s (%s)\n", file, strerror(errno));
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		goto out;
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	}
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	for (size = stats.st_size; size; size -= len) {
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		len = MIN(size, bs);
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		if (!fread(data, len, 1, fp)) {
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			if (ferror(fp)) {
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				log_err("fread() failed\n\n");
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				goto out;
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			}
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			break;
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		}
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		if (!EVP_DigestUpdate(ctx, data, len)) {
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			log_err("EVP_DigestUpdate() failed\n");
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			err = 1;
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			goto out;
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		}
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	}
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	err = 0;
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out:
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	fclose(fp);
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	free(data);
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	return err;
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}
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static int add_dir_hash(const char *file, EVP_MD_CTX *ctx)
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{
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	int err;
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	struct dirent *de;
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	DIR *dir;
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	unsigned long long ino, off;
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	unsigned int type;
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	int result = 0;
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	dir = opendir(file);
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	if (!dir) {
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		log_err("Failed to open: %s\n", file);
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		return -1;
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	}
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	while ((de = readdir(dir))) {
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		ino = de->d_ino;
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		off = de->d_off;
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		type = de->d_type;
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		log_debug("entry: %s, ino: %llu, type: %u, off: %llu, reclen: %hu\n",
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			  de->d_name, ino, type, off, de->d_reclen);
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		err = EVP_DigestUpdate(ctx, de->d_name, strlen(de->d_name));
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		/*err |= EVP_DigestUpdate(ctx, &off, sizeof(off));*/
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		err |= EVP_DigestUpdate(ctx, &ino, sizeof(ino));
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		err |= EVP_DigestUpdate(ctx, &type, sizeof(type));
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		if (!err) {
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			log_err("EVP_DigestUpdate() failed\n");
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			output_openssl_errors();
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			result = 1;
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			break;
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		}
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	}
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	closedir(dir);
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	return result;
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}
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static int add_link_hash(const char *path, EVP_MD_CTX *ctx)
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{
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	int err;
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	char buf[1024];
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	err = readlink(path, buf, sizeof(buf));
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	if (err <= 0)
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		return -1;
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	log_info("link: %s -> %.*s\n", path, err, buf);
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	return !EVP_DigestUpdate(ctx, buf, err);
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}
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static int add_dev_hash(struct stat *st, EVP_MD_CTX *ctx)
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{
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	uint32_t dev = st->st_rdev;
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	unsigned major = (dev & 0xfff00) >> 8;
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	unsigned minor = (dev & 0xff) | ((dev >> 12) & 0xfff00);
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	log_info("device: %u:%u\n", major, minor);
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	return !EVP_DigestUpdate(ctx, &dev, sizeof(dev));
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}
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int ima_calc_hash(const char *file, uint8_t *hash)
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{
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	const EVP_MD *md;
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	struct stat st;
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	EVP_MD_CTX *pctx;
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	unsigned int mdlen;
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	int err;
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#if OPENSSL_VERSION_NUMBER < 0x10100000
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	EVP_MD_CTX ctx;
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	pctx = &ctx;
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#else
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	pctx = EVP_MD_CTX_new();
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#endif
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	/*  Need to know the file length */
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	err = lstat(file, &st);
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	if (err < 0) {
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		log_err("Failed to stat: %s\n", file);
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		goto err;
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	}
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	md = EVP_get_digestbyname(imaevm_params.hash_algo);
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	if (!md) {
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		log_err("EVP_get_digestbyname(%s) failed\n",
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			imaevm_params.hash_algo);
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		err = 1;
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		goto err;
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	}
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	err = EVP_DigestInit(pctx, md);
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	if (!err) {
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		log_err("EVP_DigestInit() failed\n");
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		err = 1;
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		goto err;
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	}
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	switch (st.st_mode & S_IFMT) {
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	case S_IFREG:
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		err = add_file_hash(file, pctx);
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		break;
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	case S_IFDIR:
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		err = add_dir_hash(file, pctx);
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		break;
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	case S_IFLNK:
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		err = add_link_hash(file, pctx);
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		break;
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	case S_IFIFO: case S_IFSOCK:
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	case S_IFCHR: case S_IFBLK:
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		err = add_dev_hash(&st, pctx);
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		break;
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	default:
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		log_errno("Unsupported file type");
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		err = -1;
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		goto err;
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	}
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	if (err)
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		goto err;
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	err = EVP_DigestFinal(pctx, hash, &mdlen);
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	if (!err) {
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		log_err("EVP_DigestFinal() failed\n");
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		err = 1;
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		goto err;
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	}
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	err = mdlen;
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err:
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	if (err == 1)
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		output_openssl_errors();
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#if OPENSSL_VERSION_NUMBER >= 0x10100000
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	EVP_MD_CTX_free(pctx);
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#endif
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	return err;
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}
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EVP_PKEY *read_pub_pkey(const char *keyfile, int x509)
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{
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	FILE *fp;
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	EVP_PKEY *pkey = NULL;
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	if (!keyfile)
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		return NULL;
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	fp = fopen(keyfile, "r");
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	if (!fp) {
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		if (imaevm_params.verbose > LOG_INFO)
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			log_info("Failed to open keyfile: %s\n", keyfile);
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		return NULL;
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	}
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	if (x509) {
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		X509 *crt = d2i_X509_fp(fp, NULL);
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		if (!crt) {
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			log_err("Failed to d2i_X509_fp key file: %s\n",
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				keyfile);
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			goto out;
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		}
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		pkey = X509_extract_key(crt);
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		X509_free(crt);
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		if (!pkey) {
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			log_err("Failed to X509_extract_key key file: %s\n",
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				keyfile);
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			goto out;
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		}
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	} else {
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		pkey = PEM_read_PUBKEY(fp, NULL, NULL, NULL);
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		if (!pkey)
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			log_err("Failed to PEM_read_PUBKEY key file: %s\n",
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				keyfile);
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	}
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out:
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	if (!pkey)
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		output_openssl_errors();
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	fclose(fp);
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	return pkey;
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}
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RSA *read_pub_key(const char *keyfile, int x509)
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{
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	EVP_PKEY *pkey;
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	RSA *key;
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	pkey = read_pub_pkey(keyfile, x509);
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	if (!pkey)
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		return NULL;
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	key = EVP_PKEY_get1_RSA(pkey);
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	EVP_PKEY_free(pkey);
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	if (!key) {
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		log_err("read_pub_key: unsupported key type\n");
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		output_openssl_errors();
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		return NULL;
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	}
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	return key;
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}
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static int verify_hash_v1(const char *file, const unsigned char *hash, int size,
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			  unsigned char *sig, int siglen, const char *keyfile)
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{
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	int err, len;
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	SHA_CTX ctx;
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	unsigned char out[1024];
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	RSA *key;
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	unsigned char sighash[20];
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	struct signature_hdr *hdr = (struct signature_hdr *)sig;
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	log_info("hash-v1: ");
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	log_dump(hash, size);
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	key = read_pub_key(keyfile, 0);
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	if (!key)
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		return 1;
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	SHA1_Init(&ctx;;
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	SHA1_Update(&ctx, hash, size);
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	SHA1_Update(&ctx, hdr, sizeof(*hdr));
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	SHA1_Final(sighash, &ctx;;
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	log_info("sighash: ");
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	log_dump(sighash, sizeof(sighash));
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	err = RSA_public_decrypt(siglen - sizeof(*hdr) - 2, sig + sizeof(*hdr) + 2, out, key, RSA_PKCS1_PADDING);
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	RSA_free(key);
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	if (err < 0) {
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		log_err("%s: RSA_public_decrypt() failed: %d\n", file, err);
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		output_openssl_errors();
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		return 1;
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	}
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	len = err;
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	if (len != sizeof(sighash) || memcmp(out, sighash, len) != 0) {
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		log_err("%s: verification failed: %d\n", file, err);
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		return -1;
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	}
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	return 0;
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}
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struct public_key_entry {
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	struct public_key_entry *next;
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	uint32_t keyid;
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	char name[9];
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	EVP_PKEY *key;
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};
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static struct public_key_entry *public_keys = NULL;
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static EVP_PKEY *find_keyid(uint32_t keyid)
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{
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	struct public_key_entry *entry, *tail = public_keys;
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	int i = 1;
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	for (entry = public_keys; entry != NULL; entry = entry->next) {
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		if (entry->keyid == keyid)
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			return entry->key;
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		i++;
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		tail = entry;
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	}
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	/* add unknown keys to list */
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	entry = calloc(1, sizeof(struct public_key_entry));
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	if (!entry) {
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		perror("calloc");
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		return 0;
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	}
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	entry->keyid = keyid;
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	if (tail)
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		tail->next = entry;
Packit Service 087331
	else
Packit Service 087331
		public_keys = entry;
Packit Service 087331
	log_err("key %d: %x (unknown keyid)\n", i, __be32_to_cpup(&keyid));
Packit Service 087331
	return 0;
Packit Service 087331
}
Packit Service 087331
Packit Service 087331
void init_public_keys(const char *keyfiles)
Packit Service 087331
{
Packit Service 087331
	struct public_key_entry *entry;
Packit Service 087331
	char *tmp_keyfiles, *keyfiles_free;
Packit Service 087331
	char *keyfile;
Packit Service 087331
	int i = 1;
Packit Service 087331
Packit Service 087331
	tmp_keyfiles = strdup(keyfiles);
Packit Service 087331
	keyfiles_free = tmp_keyfiles;
Packit Service 087331
Packit Service 087331
	while ((keyfile = strsep(&tmp_keyfiles, ", \t")) != NULL) {
Packit Service 087331
		if (!keyfile)
Packit Service 087331
			break;
Packit Service 087331
		if ((*keyfile == '\0') || (*keyfile == ' ') ||
Packit Service 087331
		    (*keyfile == '\t'))
Packit Service 087331
			continue;
Packit Service 087331
Packit Service 087331
		entry = malloc(sizeof(struct public_key_entry));
Packit Service 087331
		if (!entry) {
Packit Service 087331
			perror("malloc");
Packit Service 087331
			break;
Packit Service 087331
		}
Packit Service 087331
Packit Service 087331
		entry->key = read_pub_pkey(keyfile, 1);
Packit Service 087331
		if (!entry->key) {
Packit Service 087331
			free(entry);
Packit Service 087331
			continue;
Packit Service 087331
		}
Packit Service 087331
Packit Service 087331
		calc_keyid_v2(&entry->keyid, entry->name, entry->key);
Packit Service 087331
		sprintf(entry->name, "%x", __be32_to_cpup(&entry->keyid));
Packit Service 087331
		log_info("key %d: %s %s\n", i++, entry->name, keyfile);
Packit Service 087331
		entry->next = public_keys;
Packit Service 087331
		public_keys = entry;
Packit Service 087331
	}
Packit Service 087331
	free(keyfiles_free);
Packit Service 087331
}
Packit Service 087331
Packit Service 087331
/*
Packit Service 087331
 * Return: 0 verification good, 1 verification bad, -1 error.
Packit Service 087331
 */
Packit Service 087331
static int verify_hash_v2(const char *file, const unsigned char *hash, int size,
Packit Service 087331
			  unsigned char *sig, int siglen)
Packit Service 087331
{
Packit Service 087331
	int ret = -1;
Packit Service 087331
	EVP_PKEY *pkey, *pkey_free = NULL;
Packit Service 087331
	struct signature_v2_hdr *hdr = (struct signature_v2_hdr *)sig;
Packit Service 087331
	EVP_PKEY_CTX *ctx;
Packit Service 087331
	const EVP_MD *md;
Packit Service 087331
	const char *st;
Packit Service 087331
Packit Service 087331
	if (imaevm_params.verbose > LOG_INFO) {
Packit Service 087331
		log_info("hash(%s): ", imaevm_params.hash_algo);
Packit Service 087331
		log_dump(hash, size);
Packit Service 087331
	}
Packit Service 087331
Packit Service 087331
	pkey = find_keyid(hdr->keyid);
Packit Service 087331
	if (!pkey) {
Packit Service 087331
		uint32_t keyid = hdr->keyid;
Packit Service 087331
Packit Service 087331
		if (imaevm_params.verbose > LOG_INFO)
Packit Service 087331
			log_info("%s: verification failed: unknown keyid %x\n",
Packit Service 087331
				 file, __be32_to_cpup(&keyid));
Packit Service 087331
		return -1;
Packit Service 087331
	}
Packit Service 087331
Packit Service 087331
	st = "EVP_PKEY_CTX_new";
Packit Service 087331
	if (!(ctx = EVP_PKEY_CTX_new(pkey, NULL)))
Packit Service 087331
		goto err;
Packit Service 087331
	st = "EVP_PKEY_verify_init";
Packit Service 087331
	if (!EVP_PKEY_verify_init(ctx))
Packit Service 087331
		goto err;
Packit Service 087331
	st = "EVP_get_digestbyname";
Packit Service 087331
	if (!(md = EVP_get_digestbyname(imaevm_params.hash_algo)))
Packit Service 087331
		goto err;
Packit Service 087331
	st = "EVP_PKEY_CTX_set_signature_md";
Packit Service 087331
	if (!EVP_PKEY_CTX_set_signature_md(ctx, md))
Packit Service 087331
		goto err;
Packit Service 087331
	st = "EVP_PKEY_verify";
Packit Service 087331
	ret = EVP_PKEY_verify(ctx, sig + sizeof(*hdr),
Packit Service 087331
			      siglen - sizeof(*hdr), hash, size);
Packit Service 087331
	if (ret == 1)
Packit Service 087331
		ret = 0;
Packit Service 087331
	else if (ret == 0) {
Packit Service 087331
		log_err("%s: verification failed: %d (%s)\n",
Packit Service 087331
			file, ret, ERR_reason_error_string(ERR_get_error()));
Packit Service 087331
		output_openssl_errors();
Packit Service 087331
		ret = 1;
Packit Service 087331
	}
Packit Service 087331
err:
Packit Service 087331
	if (ret < 0 || ret > 1) {
Packit Service 087331
		log_err("%s: verification failed: %d (%s) in %s\n",
Packit Service 087331
			file, ret, ERR_reason_error_string(ERR_peek_error()),
Packit Service 087331
			st);
Packit Service 087331
		output_openssl_errors();
Packit Service 087331
		ret = -1;
Packit Service 087331
	}
Packit Service 087331
	EVP_PKEY_CTX_free(ctx);
Packit Service 087331
	EVP_PKEY_free(pkey_free);
Packit Service 087331
	return ret;
Packit Service 087331
}
Packit Service 087331
Packit Service 087331
int imaevm_get_hash_algo(const char *algo)
Packit Service 087331
{
Packit Service 087331
	int i;
Packit Service 087331
Packit Service 087331
	/* first iterate over builtin algorithms */
Packit Service 087331
	for (i = 0; i < PKEY_HASH__LAST; i++)
Packit Service 087331
		if (pkey_hash_algo[i] &&
Packit Service 087331
		    !strcmp(algo, pkey_hash_algo[i]))
Packit Service 087331
			return i;
Packit Service 087331
Packit Service 087331
	for (i = 0; i < PKEY_HASH__LAST; i++)
Packit Service 087331
		if (pkey_hash_algo_kern[i] &&
Packit Service 087331
		    !strcmp(algo, pkey_hash_algo_kern[i]))
Packit Service 087331
			return i;
Packit Service 087331
Packit Service 087331
	/* iterate over algorithms provided by kernel-headers */
Packit Service 087331
	for (i = 0; i < HASH_ALGO__LAST; i++)
Packit Service 087331
		if (hash_algo_name[i] &&
Packit Service 087331
		    !strcmp(algo, hash_algo_name[i]))
Packit Service 087331
			return i;
Packit Service 087331
Packit Service 087331
	return -1;
Packit Service 087331
}
Packit Service 087331
Packit Service 087331
int imaevm_hash_algo_from_sig(unsigned char *sig)
Packit Service 087331
{
Packit Service 087331
	uint8_t hashalgo;
Packit Service 087331
Packit Service 087331
	if (sig[0] == DIGSIG_VERSION_1) {
Packit Service 087331
		hashalgo = ((struct signature_hdr *)sig)->hash;
Packit Service 087331
Packit Service 087331
		if (hashalgo >= DIGEST_ALGO_MAX)
Packit Service 087331
			return -1;
Packit Service 087331
Packit Service 087331
		switch (hashalgo) {
Packit Service 087331
		case DIGEST_ALGO_SHA1:
Packit Service 087331
			return PKEY_HASH_SHA1;
Packit Service 087331
		case DIGEST_ALGO_SHA256:
Packit Service 087331
			return PKEY_HASH_SHA256;
Packit Service 087331
		default:
Packit Service 087331
			return -1;
Packit Service 087331
		}
Packit Service 087331
	} else if (sig[0] == DIGSIG_VERSION_2) {
Packit Service 087331
		hashalgo = ((struct signature_v2_hdr *)sig)->hash_algo;
Packit Service 087331
		if (hashalgo >= PKEY_HASH__LAST)
Packit Service 087331
			return -1;
Packit Service 087331
		return hashalgo;
Packit Service 087331
	} else
Packit Service 087331
		return -1;
Packit Service 087331
}
Packit Service 087331
Packit Service 087331
int verify_hash(const char *file, const unsigned char *hash, int size, unsigned char *sig,
Packit Service 087331
		int siglen)
Packit Service 087331
{
Packit Service 087331
	/* Get signature type from sig header */
Packit Service 087331
	if (sig[0] == DIGSIG_VERSION_1) {
Packit Service 087331
		const char *key = NULL;
Packit Service 087331
Packit Service 087331
		/* Read pubkey from RSA key */
Packit Service 087331
		if (!imaevm_params.keyfile)
Packit Service 087331
			key = "/etc/keys/pubkey_evm.pem";
Packit Service 087331
		else
Packit Service 087331
			key = imaevm_params.keyfile;
Packit Service 087331
		return verify_hash_v1(file, hash, size, sig, siglen, key);
Packit Service 087331
	} else if (sig[0] == DIGSIG_VERSION_2) {
Packit Service 087331
		return verify_hash_v2(file, hash, size, sig, siglen);
Packit Service 087331
	} else
Packit Service 087331
		return -1;
Packit Service 087331
}
Packit Service 087331
Packit Service 087331
int ima_verify_signature(const char *file, unsigned char *sig, int siglen,
Packit Service 087331
			 unsigned char *digest, int digestlen)
Packit Service 087331
{
Packit Service 087331
	unsigned char hash[MAX_DIGEST_SIZE];
Packit Service 087331
	int hashlen, sig_hash_algo;
Packit Service 087331
Packit Service 087331
	if (sig[0] != EVM_IMA_XATTR_DIGSIG) {
Packit Service 087331
		log_err("%s: xattr ima has no signature\n", file);
Packit Service 087331
		return -1;
Packit Service 087331
	}
Packit Service 087331
Packit Service 087331
	sig_hash_algo = imaevm_hash_algo_from_sig(sig + 1);
Packit Service 087331
	if (sig_hash_algo < 0) {
Packit Service 087331
		log_err("%s: Invalid signature\n", file);
Packit Service 087331
		return -1;
Packit Service 087331
	}
Packit Service 087331
	/* Use hash algorithm as retrieved from signature */
Packit Service 087331
	imaevm_params.hash_algo = imaevm_hash_algo_by_id(sig_hash_algo);
Packit Service 087331
Packit Service 087331
	/*
Packit Service 087331
	 * Validate the signature based on the digest included in the
Packit Service 087331
	 * measurement list, not by calculating the local file digest.
Packit Service 087331
	 */
Packit Service 087331
	if (digestlen > 0)
Packit Service 087331
	    return verify_hash(file, digest, digestlen, sig + 1, siglen - 1);
Packit Service 087331
Packit Service 087331
	hashlen = ima_calc_hash(file, hash);
Packit Service 087331
	if (hashlen <= 1)
Packit Service 087331
		return hashlen;
Packit Service 087331
	assert(hashlen <= sizeof(hash));
Packit Service 087331
Packit Service 087331
	return verify_hash(file, hash, hashlen, sig + 1, siglen - 1);
Packit Service 087331
}
Packit Service 087331
Packit Service 087331
/*
Packit Service 087331
 * Create binary key representation suitable for kernel
Packit Service 087331
 */
Packit Service 087331
int key2bin(RSA *key, unsigned char *pub)
Packit Service 087331
{
Packit Service 087331
	int len, b, offset = 0;
Packit Service 087331
	struct pubkey_hdr *pkh = (struct pubkey_hdr *)pub;
Packit Service 087331
	const BIGNUM *n, *e;
Packit Service 087331
Packit Service 087331
#if OPENSSL_VERSION_NUMBER < 0x10100000
Packit Service 087331
	n = key->n;
Packit Service 087331
	e = key->e;
Packit Service 087331
#else
Packit Service 087331
	RSA_get0_key(key, &n, &e, NULL);
Packit Service 087331
#endif
Packit Service 087331
Packit Service 087331
	/* add key header */
Packit Service 087331
	pkh->version = 1;
Packit Service 087331
	pkh->timestamp = 0;	/* PEM has no timestamp?? */
Packit Service 087331
	pkh->algo = PUBKEY_ALGO_RSA;
Packit Service 087331
	pkh->nmpi = 2;
Packit Service 087331
Packit Service 087331
	offset += sizeof(*pkh);
Packit Service 087331
Packit Service 087331
	len = BN_num_bytes(n);
Packit Service 087331
	b = BN_num_bits(n);
Packit Service 087331
	pub[offset++] = b >> 8;
Packit Service 087331
	pub[offset++] = b & 0xff;
Packit Service 087331
	BN_bn2bin(n, &pub[offset]);
Packit Service 087331
	offset += len;
Packit Service 087331
Packit Service 087331
	len = BN_num_bytes(e);
Packit Service 087331
	b = BN_num_bits(e);
Packit Service 087331
	pub[offset++] = b >> 8;
Packit Service 087331
	pub[offset++] = b & 0xff;
Packit Service 087331
	BN_bn2bin(e, &pub[offset]);
Packit Service 087331
	offset += len;
Packit Service 087331
Packit Service 087331
	return offset;
Packit Service 087331
}
Packit Service 087331
Packit Service 087331
void calc_keyid_v1(uint8_t *keyid, char *str, const unsigned char *pkey, int len)
Packit Service 087331
{
Packit Service 087331
	uint8_t sha1[SHA_DIGEST_LENGTH];
Packit Service 087331
	uint64_t id;
Packit Service 087331
Packit Service 087331
	SHA1(pkey, len, sha1);
Packit Service 087331
Packit Service 087331
	/* sha1[12 - 19] is exactly keyid from gpg file */
Packit Service 087331
	memcpy(keyid, sha1 + 12, 8);
Packit Service 087331
	log_debug("keyid: ");
Packit Service 087331
	log_debug_dump(keyid, 8);
Packit Service 087331
	id = __be64_to_cpup((__be64 *) keyid);
Packit Service 087331
	sprintf(str, "%llX", (unsigned long long)id);
Packit Service 087331
Packit Service 087331
	if (imaevm_params.verbose > LOG_INFO)
Packit Service 087331
		log_info("keyid-v1: %s\n", str);
Packit Service 087331
}
Packit Service 087331
Packit Service 087331
/*
Packit Service 087331
 * Calculate keyid of the public_key part of EVP_PKEY
Packit Service 087331
 */
Packit Service 087331
void calc_keyid_v2(uint32_t *keyid, char *str, EVP_PKEY *pkey)
Packit Service 087331
{
Packit Service 087331
	X509_PUBKEY *pk = NULL;
Packit Service 087331
	const unsigned char *public_key = NULL;
Packit Service 087331
	int len;
Packit Service 087331
Packit Service 087331
	/* This is more generic than i2d_PublicKey() */
Packit Service 087331
	if (X509_PUBKEY_set(&pk, pkey) &&
Packit Service 087331
	    X509_PUBKEY_get0_param(NULL, &public_key, &len, NULL, pk)) {
Packit Service 087331
		uint8_t sha1[SHA_DIGEST_LENGTH];
Packit Service 087331
Packit Service 087331
		SHA1(public_key, len, sha1);
Packit Service 087331
		/* sha1[12 - 19] is exactly keyid from gpg file */
Packit Service 087331
		memcpy(keyid, sha1 + 16, 4);
Packit Service 087331
	} else
Packit Service 087331
		*keyid = 0;
Packit Service 087331
Packit Service 087331
	log_debug("keyid: ");
Packit Service 087331
	log_debug_dump(keyid, 4);
Packit Service 087331
	sprintf(str, "%x", __be32_to_cpup(keyid));
Packit Service 087331
Packit Service 087331
	if (imaevm_params.verbose > LOG_INFO)
Packit Service 087331
		log_info("keyid: %s\n", str);
Packit Service 087331
Packit Service 087331
	X509_PUBKEY_free(pk);
Packit Service 087331
}
Packit Service 087331
Packit Service 087331
static EVP_PKEY *read_priv_pkey(const char *keyfile, const char *keypass)
Packit Service 087331
{
Packit Service 087331
	FILE *fp;
Packit Service 087331
	EVP_PKEY *pkey;
Packit Service 087331
Packit Service 087331
	fp = fopen(keyfile, "r");
Packit Service 087331
	if (!fp) {
Packit Service 087331
		log_err("Failed to open keyfile: %s\n", keyfile);
Packit Service 087331
		return NULL;
Packit Service 087331
	}
Packit Service 087331
	pkey = PEM_read_PrivateKey(fp, NULL, NULL, (void *)keypass);
Packit Service 087331
	if (!pkey) {
Packit Service 087331
		log_err("Failed to PEM_read_PrivateKey key file: %s\n",
Packit Service 087331
			keyfile);
Packit Service 087331
		output_openssl_errors();
Packit Service 087331
	}
Packit Service 087331
Packit Service 087331
	fclose(fp);
Packit Service 087331
	return pkey;
Packit Service 087331
}
Packit Service 087331
Packit Service 087331
static RSA *read_priv_key(const char *keyfile, const char *keypass)
Packit Service 087331
{
Packit Service 087331
	EVP_PKEY *pkey;
Packit Service 087331
	RSA *key;
Packit Service 087331
Packit Service 087331
	pkey = read_priv_pkey(keyfile, keypass);
Packit Service 087331
	if (!pkey)
Packit Service 087331
		return NULL;
Packit Service 087331
	key = EVP_PKEY_get1_RSA(pkey);
Packit Service 087331
	EVP_PKEY_free(pkey);
Packit Service 087331
	if (!key) {
Packit Service 087331
		log_err("read_priv_key: unsupported key type\n");
Packit Service 087331
		output_openssl_errors();
Packit Service 087331
		return NULL;
Packit Service 087331
	}
Packit Service 087331
	return key;
Packit Service 087331
}
Packit Service 087331
Packit Service 087331
static int get_hash_algo_v1(const char *algo)
Packit Service 087331
{
Packit Service 087331
Packit Service 087331
	if (!strcmp(algo, "sha1"))
Packit Service 087331
		return DIGEST_ALGO_SHA1;
Packit Service 087331
	else if (!strcmp(algo, "sha256"))
Packit Service 087331
		return DIGEST_ALGO_SHA256;
Packit Service 087331
Packit Service 087331
	return -1;
Packit Service 087331
}
Packit Service 087331
Packit Service 087331
static int sign_hash_v1(const char *hashalgo, const unsigned char *hash,
Packit Service 087331
			int size, const char *keyfile, unsigned char *sig)
Packit Service 087331
{
Packit Service 087331
	int len = -1, hashalgo_idx;
Packit Service 087331
	SHA_CTX ctx;
Packit Service 087331
	unsigned char pub[1024];
Packit Service 087331
	RSA *key;
Packit Service 087331
	char name[20];
Packit Service 087331
	unsigned char sighash[20];
Packit Service 087331
	struct signature_hdr *hdr;
Packit Service 087331
	uint16_t *blen;
Packit Service 087331
Packit Service 087331
	if (!hash) {
Packit Service 087331
		log_err("sign_hash_v1: hash is null\n");
Packit Service 087331
		return -1;
Packit Service 087331
	}
Packit Service 087331
Packit Service 087331
	if (size < 0) {
Packit Service 087331
		log_err("sign_hash_v1: size is negative: %d\n", size);
Packit Service 087331
		return -1;
Packit Service 087331
	}
Packit Service 087331
Packit Service 087331
	if (!hashalgo) {
Packit Service 087331
		log_err("sign_hash_v1: hashalgo is null\n");
Packit Service 087331
		return -1;
Packit Service 087331
	}
Packit Service 087331
Packit Service 087331
	if (!sig) {
Packit Service 087331
		log_err("sign_hash_v1: sig is null\n");
Packit Service 087331
		return -1;
Packit Service 087331
	}
Packit Service 087331
Packit Service 087331
	log_info("hash(%s): ", hashalgo);
Packit Service 087331
	log_dump(hash, size);
Packit Service 087331
Packit Service 087331
	key = read_priv_key(keyfile, imaevm_params.keypass);
Packit Service 087331
	if (!key)
Packit Service 087331
		return -1;
Packit Service 087331
Packit Service 087331
	hdr = (struct signature_hdr *)sig;
Packit Service 087331
Packit Service 087331
	/* now create a new hash */
Packit Service 087331
	hdr->version = (uint8_t) DIGSIG_VERSION_1;
Packit Service 087331
	hdr->timestamp = time(NULL);
Packit Service 087331
	hdr->algo = PUBKEY_ALGO_RSA;
Packit Service 087331
	hashalgo_idx = get_hash_algo_v1(hashalgo);
Packit Service 087331
	if (hashalgo_idx < 0) {
Packit Service 087331
		log_err("Signature version 1 does not support hash algo %s\n",
Packit Service 087331
			hashalgo);
Packit Service 087331
		goto out;
Packit Service 087331
	}
Packit Service 087331
	hdr->hash = (uint8_t) hashalgo_idx;
Packit Service 087331
Packit Service 087331
	len = key2bin(key, pub);
Packit Service 087331
	calc_keyid_v1(hdr->keyid, name, pub, len);
Packit Service 087331
Packit Service 087331
	hdr->nmpi = 1;
Packit Service 087331
Packit Service 087331
	SHA1_Init(&ctx;;
Packit Service 087331
	SHA1_Update(&ctx, hash, size);
Packit Service 087331
	SHA1_Update(&ctx, hdr, sizeof(*hdr));
Packit Service 087331
	SHA1_Final(sighash, &ctx;;
Packit Service 087331
	log_info("sighash: ");
Packit Service 087331
	log_dump(sighash, sizeof(sighash));
Packit Service 087331
Packit Service 087331
	len = RSA_private_encrypt(sizeof(sighash), sighash, sig + sizeof(*hdr) + 2, key, RSA_PKCS1_PADDING);
Packit Service 087331
	if (len < 0) {
Packit Service 087331
		log_err("RSA_private_encrypt() failed: %d\n", len);
Packit Service 087331
		output_openssl_errors();
Packit Service 087331
		goto out;
Packit Service 087331
	}
Packit Service 087331
Packit Service 087331
	/* we add bit length of the signature to make it gnupg compatible */
Packit Service 087331
	blen = (uint16_t *) (sig + sizeof(*hdr));
Packit Service 087331
	*blen = __cpu_to_be16(len << 3);
Packit Service 087331
	len += sizeof(*hdr) + 2;
Packit Service 087331
	log_info("evm/ima signature-v1: %d bytes\n", len);
Packit Service 087331
out:
Packit Service 087331
	RSA_free(key);
Packit Service 087331
	return len;
Packit Service 087331
}
Packit Service 087331
Packit Service 087331
/*
Packit Service 087331
 * @sig is assumed to be of (MAX_SIGNATURE_SIZE - 1) size
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 * Return: -1 signing error, >0 length of signature
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 */
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static int sign_hash_v2(const char *algo, const unsigned char *hash,
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			int size, const char *keyfile, unsigned char *sig)
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{
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	struct signature_v2_hdr *hdr;
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	int len = -1;
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	EVP_PKEY *pkey;
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	char name[20];
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	EVP_PKEY_CTX *ctx = NULL;
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	const EVP_MD *md;
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	size_t sigsize;
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	const char *st;
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	uint32_t keyid;
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	if (!hash) {
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		log_err("sign_hash_v2: hash is null\n");
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		return -1;
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	}
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	if (size < 0) {
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		log_err("sign_hash_v2: size is negative: %d\n", size);
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		return -1;
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	}
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	if (!sig) {
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		log_err("sign_hash_v2: sig is null\n");
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		return -1;
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	}
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	if (!algo) {
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		log_err("sign_hash_v2: algo is null\n");
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		return -1;
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	}
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	log_info("hash(%s): ", imaevm_params.hash_algo);
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	log_dump(hash, size);
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	pkey = read_priv_pkey(keyfile, imaevm_params.keypass);
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	if (!pkey)
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		return -1;
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	hdr = (struct signature_v2_hdr *)sig;
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	hdr->version = (uint8_t) DIGSIG_VERSION_2;
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	hdr->hash_algo = imaevm_get_hash_algo(algo);
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	if (hdr->hash_algo == (uint8_t)-1) {
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		log_err("sign_hash_v2: hash algo is unknown: %s\n", algo);
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		return -1;
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	}
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	calc_keyid_v2(&keyid, name, pkey);
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	hdr->keyid = keyid;
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	st = "EVP_PKEY_CTX_new";
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	if (!(ctx = EVP_PKEY_CTX_new(pkey, NULL)))
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		goto err;
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	st = "EVP_PKEY_sign_init";
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	if (!EVP_PKEY_sign_init(ctx))
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		goto err;
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	st = "EVP_get_digestbyname";
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	if (!(md = EVP_get_digestbyname(imaevm_params.hash_algo)))
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		goto err;
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	st = "EVP_PKEY_CTX_set_signature_md";
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	if (!EVP_PKEY_CTX_set_signature_md(ctx, md))
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		goto err;
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	st = "EVP_PKEY_sign";
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	sigsize = MAX_SIGNATURE_SIZE - sizeof(struct signature_v2_hdr) - 1;
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	if (!EVP_PKEY_sign(ctx, hdr->sig, &sigsize, hash, size))
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		goto err;
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	len = (int)sigsize;
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	/* we add bit length of the signature to make it gnupg compatible */
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	hdr->sig_size = __cpu_to_be16(len);
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	len += sizeof(*hdr);
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	log_info("evm/ima signature: %d bytes\n", len);
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err:
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	if (len == -1) {
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		log_err("sign_hash_v2: signing failed: (%s) in %s\n",
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			ERR_reason_error_string(ERR_peek_error()), st);
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		output_openssl_errors();
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	}
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	EVP_PKEY_CTX_free(ctx);
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	EVP_PKEY_free(pkey);
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	return len;
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}
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int sign_hash(const char *hashalgo, const unsigned char *hash, int size, const char *keyfile, const char *keypass, unsigned char *sig)
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{
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	if (keypass)
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		imaevm_params.keypass = keypass;
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	return imaevm_params.x509 ?
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		sign_hash_v2(hashalgo, hash, size, keyfile, sig) :
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		sign_hash_v1(hashalgo, hash, size, keyfile, sig);
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}
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static void libinit()
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{
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#if OPENSSL_VERSION_NUMBER < 0x10100000
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	OpenSSL_add_all_algorithms();
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	OPENSSL_add_all_algorithms_conf();
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#else
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	OPENSSL_init_crypto(OPENSSL_INIT_ADD_ALL_CIPHERS |
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			    OPENSSL_INIT_ADD_ALL_DIGESTS, NULL);
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	ERR_load_crypto_strings();
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#endif
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}