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evmctl - IMA/EVM control tool

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evmctl provides signing support for IMA/EVM.
Functionality includes signing of file content (IMA), file metadata (EVM),
importing public keys into kernel keyring.

Signed-off-by: Dmitry Kasatkin <dmitry.kasatkin@intel.com>
This commit is contained in:
Dmitry Kasatkin 2011-10-14 16:53:34 +03:00
parent 6ec041487e
commit 273701a5b2
21 changed files with 1699 additions and 0 deletions
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*.swp
*~
# Generated by autotools
.deps
aclocal.m4
autom4te.cache
config.guess
config.log
config.status
config.sub
configure
depcomp
install-sh
Makefile.in
Makefile
!tests/data/Makefile
missing
compile
libtool
ltmain.sh
# Compiled executables
*.o
*.a
src/evmctl
tests/openclose
config.h
config.h.in
stamp-h1
*.spec
# But don't ignore the symlinks with the same names in this directory
!tests/valgrind/*
# cscope/tags
tags
TAGS
cscope.*
ncscope.*
# Generated documentation
*.8
*.5
manpage.links
manpage.refs
# quilt's files
patches
series
# test output

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Dmitry Kasatkin <dmitry.kasatkin@intel.com>

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COPYING Normal file
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2011-08-24 Dmitry Kasatkin <dmitry.kasatkin@intel.com>
version 0.1
* Initial public version.

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Installation Instructions
*************************
Copyright (C) 1994, 1995, 1996, 1999, 2000, 2001, 2002, 2004, 2005,
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Copying and distribution of this file, with or without modification,
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==================
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====================================
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SUBDIRS = src tests
#EXTRA_DIST = LEGAL acinclude.m4 include
ACLOCAL_AMFLAGS = -I m4

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1. Generate private key
openssl genrsa -out privkey_evm.pem 1024
2. Generate public key
openssl rsa -pubout -in privkey_evm.pem -out pubkey_evm.pem
3. Copy public (+private if to sign on device) key to the device/qemu /etc/keys
scp pubkey_evm.pem mad:/etc/keys
4. Load keys and enable EVM
evm_enable.sh
This should be done at early phase, before mounting root filesystem.
5. Sign EVM and use hash value for IMA - common case
evmctl sign --imahash test.txt
6. Sign IMA and EVM - for immutable files and modules
evmctl sign --imasig test.txt
7. Sign whole filesystem
evm_sign_all.sh
or
find / \( -fstype rootfs -o -fstype ext3 -o -fstype ext4 \) ! -path "/lib/modules/*" -type f -uid 0 -exec evmctl sign --imahash '{}' \;
find /lib/modules ! -name "*.ko" -type f -uid 0 -exec evmctl sign --imahash '{}' \;
# security.ima needs to have signature for modules
find /lib/modules -name "*.ko" -type f -uid 0 -exec evmctl sign --imasig '{}' \;
8. Label filesystem in fix mode...
ima_fix_dir.sh <dir>

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AC_DEFUN([PKG_ARG_ENABLE],
[
AC_MSG_CHECKING(whether to enable $1)
AC_ARG_ENABLE([$1], AC_HELP_STRING([--enable-$1], [enable $1 (default is $2)]),
[pkg_cv_enable_$1=$enableval],
[AC_CACHE_VAL([pkg_cv_enable_$1], [pkg_cv_enable_$1=$2])])
if test $pkg_cv_enable_$1 = yes; then
AC_DEFINE([$3],, [$4])
fi
AC_MSG_RESULT([$pkg_cv_enable_$1])
AM_CONDITIONAL($3, test $pkg_cv_enable_$1 = yes)
])

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#! /bin/sh
set -e
# new way
# strange, but need this for Makefile.am, because it has -I m4
test -d m4 || mkdir m4
autoreconf -f -i
# old way
#libtoolize --automake --copy --force
#aclocal
#autoconf --force
#autoheader --force
#automake --add-missing --copy --force-missing --gnu

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# autoconf script
AC_PREREQ([2.65])
AC_INIT(evm-utils, 0.1, dmitry.kasatkin@intel.com)
AM_INIT_AUTOMAKE(AC_PACKAGE_NAME, AC_PACKAGE_VERSION)
AC_CONFIG_HEADERS([config.h])
AC_CONFIG_MACRO_DIR([m4])
AC_CANONICAL_HOST
# Checks for programs.
AC_PROG_CC
AM_PROG_CC_C_O
#AC_PROG_CXX
#AC_PROG_CPP
AC_PROG_INSTALL
AC_PROG_LIBTOOL
#AC_PROG_LN_S
LT_INIT
# FIXME: Replace `main' with a function in `-lpthread':
#AC_CHECK_LIB([pthread], [main])
# Checks for header files.
AC_HEADER_STDC
PKG_CHECK_MODULES(OPENSSL, [ openssl >= 0.9.8 ])
AC_SUBST(OPENSSL_CFLAGS)
AC_SUBST(OPENSSL_LIBS)
AC_CHECK_HEADER(unistd.h)
AC_CHECK_HEADERS(openssl/conf.h)
#debug support - yes for a while
PKG_ARG_ENABLE(debug, "yes", DEBUG, [Enable Debug support])
if test $pkg_cv_enable_debug = yes; then
CFLAGS="-g -O1 -Wall -Wstrict-prototypes -pipe"
else
CFLAGS="$CFLAGS -Wall -Wstrict-prototypes -pipe -fomit-frame-pointer"
fi
# for gcov
#CFLAGS="$CFLAGS -Wall -fprofile-arcs -ftest-coverage"
#CXXFLAGS="$CXXFLAGS -Wall -fprofile-arcs -ftest-coverage"
#LDFLAGS="$LDFLAGS -fprofile-arcs"
#DISTCLEANFILES="*.gcno *.gcda"
AC_CONFIG_FILES([Makefile
src/Makefile
tests/Makefile
evm-utils.spec
])
AC_OUTPUT
# Give some feedback
echo
echo
echo "Configuration:"
echo " debug: $pkg_cv_enable_debug"
echo

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Name: @PACKAGE_NAME@
Version: @PACKAGE_VERSION@
Release: 1%{?dist}
Summary: evm-utils - IMA/EVM support utilities
Group: System/Libraries
License: LGPLv2
#URL:
Source0: %{name}-%{version}.tar.gz
BuildRoot: %{_tmppath}/%{name}-%{version}-%{release}-root
BuildRequires: autoconf
BuildRequires: automake
BuildRequires: openssl-devel
BuildRequires: libattr-devel
BuildRequires: readline-devel
BuildRequires: keyutils-libs-devel
%description
This library provides EVM support utilities.
%prep
%setup -q
%build
./autogen.sh
%configure --prefix=/usr
make
%install
rm -rf %{buildroot}
make DESTDIR=%{buildroot} install
%clean
rm -rf %{buildroot}
%post
/sbin/ldconfig
exit 0
%preun -p /sbin/ldconfig
%postun
/sbin/ldconfig
%files
%defattr(-,root,root,-)
%{_bindir}/*
%{_libdir}/*
%changelog
* Wed Jul 20 2011 Dmitry Kasatkin <dmitry.kasatkin@intel.com>
- Initial package for MeeGo

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bin_PROGRAMS = evmctl
evmctl_SOURCES = evmctl.c
evmctl_CPPFLAGS = $(OPENSSL_CFLAGS)
evmctl_LDFLAGS = $(LDFLAGS_READLINE)
evmctl_LDADD = $(OPENSSL_LIBS) -lkeyutils
INCLUDES = -I$(top_srcdir) -include config.h
DISTCLEANFILES = @DISTCLEANFILES@

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/*
* evm-utils - IMA/EVM support utilities
*
* Copyright (C) 2011 Nokia Corporation
* Copyright (C) 2011 Intel Corporation
*
* Authors:
* Dmitry Kasatkin <dmitry.kasatkin@nokia.com>
* <dmitry.kasatkin@intel.com>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public License
* version 2.1 as published by the Free Software Foundation.
*
* This library is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
* 02110-1301 USA
*
* File: evmctl.c
* IMA/EVM control program
*/
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/ioctl.h>
#include <sys/param.h>
#include <fcntl.h>
#include <unistd.h>
#include <stdlib.h>
#include <stdio.h>
#include <stdint.h>
#include <string.h>
#include <attr/xattr.h>
#include <getopt.h>
#include <signal.h>
#include <keyutils.h>
#include <asm/byteorder.h>
#include <syslog.h>
#include <attr/xattr.h>
#include <openssl/sha.h>
#include <openssl/sha.h>
#include <openssl/rsa.h>
#include <openssl/pem.h>
#define USE_FPRINTF
#ifdef USE_FPRINTF
#define do_log(level, fmt, args...) if (level <= verbose) fprintf(stderr, fmt, ##args)
#define do_log_dump(level, p, len) if (level <= verbose) do_dump(stderr, p, len)
#else
#define do_log(level, fmt, args...) syslog(level, fmt, ##args)
#define do_log_dump(p, len)
#endif
#ifdef DEBUG
#define log_debug(fmt, args...) do_log(LOG_DEBUG, "%s:%d " fmt, __func__ , __LINE__ , ##args)
#define log_debug_dump(p, len) do_log_dump(LOG_DEBUG, p, len)
#else
#define log_debug(fmt, args...)
#define log_debug_dump(p, len)
#endif
#define log_dump(p, len) do_log_dump(LOG_INFO, p, len)
#define log_info(fmt, args...) do_log(LOG_INFO, fmt, ##args)
#define log_err(fmt, args...) do_log(LOG_ERR, fmt, ##args)
#define log_errno(fmt, args...) do_log(LOG_ERR, fmt ": %s (%d)\n", ##args, strerror(errno), errno)
#define DATA_SIZE 4096
#define SHA1_HASH_LEN 20
#define EXT2_IOC_GETVERSION _IOR('v', 1, long)
#define EXT34_IOC_GETVERSION _IOR('f', 3, long)
#define FS_IOC_GETFLAGS _IOR('f', 1, long)
#define FS_IOC_SETFLAGS _IOW('f', 2, long)
#define FS_IOC32_GETFLAGS _IOR('f', 1, int)
#define FS_IOC32_SETFLAGS _IOW('f', 2, int)
struct h_misc {
unsigned long ino;
uint32_t generation;
uid_t uid;
gid_t gid;
unsigned short mode;
} hmac_misc;
enum pubkey_algo {
PUBKEY_ALGO_RSA,
PUBKEY_ALGO_MAX,
};
enum digest_algo {
DIGEST_ALGO_SHA1,
DIGEST_ALGO_SHA256,
DIGEST_ALGO_MAX
};
struct pubkey_hdr {
uint8_t version; /* key format version */
time_t timestamp; /* key made, always 0 for now */
uint8_t algo;
uint8_t nmpi;
char mpi[0];
} __attribute__ ((packed));
struct signature_hdr {
uint8_t version; /* signature format version */
time_t timestamp; /* signature made */
uint8_t algo;
uint8_t hash;
uint8_t keyid[8];
uint8_t nmpi;
char mpi[0];
} __attribute__ ((packed));
static char *evm_config_xattrnames[] = {
"security.selinux",
"security.SMACK64",
"security.ima",
"security.capability",
NULL
};
struct command {
char *name;
int (*func)(struct command *cmd);
int cmd;
char *arg;
char *msg; /* extra info message */
};
static int verbose = LOG_INFO - 1;
static int g_argc;
static char **g_argv;
static int set_xattr = 1;
static int digest = 0;
static int digsig = 0;
static char *hash_algo = "sha1";
static int binkey = 0;
extern struct command cmds[];
static void print_usage(struct command *cmd);
static void do_dump(FILE *fp, const void *ptr, int len)
{
int i;
uint8_t *data = (uint8_t *)ptr;
for (i = 0; i < len; i++) {
fprintf(fp, "%02x", data[i]);
}
fprintf(fp, "\n");
}
static void dump(const void *ptr, int len)
{
do_dump(stdout, ptr, len);
}
static inline int get_filesize(const char *filename)
{
struct stat stats;
/* Need to know the file length */
stat(filename, &stats);
return (int) stats.st_size;
}
static inline int get_fdsize(int fd)
{
struct stat stats;
/* Need to know the file length */
fstat(fd, &stats);
return (int) stats.st_size;
}
static int bin2file(const char *file, const char *ext, const unsigned char *data, int len)
{
FILE *fp;
char name[strlen(file) + (ext ? strlen(ext) : 0) + 2];
int err;
if (ext)
sprintf(name, "%s.%s", file, ext);
else
sprintf(name, "%s", file);
log_info("Writing to %s\n", name);
fp = fopen(name, "w");
if (!fp) {
log_errno("Unable to open %s for writing", name);
return -1;
}
err = fwrite(data, len, 1, fp);
fclose(fp);
return err;
}
static char *file2bin(const char *file, int *size)
{
FILE *fp;
int len;
char *data;
len = get_filesize(file);
fp = fopen(file, "r");
if (!fp) {
log_errno("Unable to open %s", file);
return NULL;
}
data = malloc(len);
if (!fread(data, len, 1, fp))
len = 0;
fclose(fp);
*size = len;
return data;
}
/*
* Create binary key representation suitable for kernel
*/
static int key2bin(RSA *key, unsigned char *pub)
{
int len, b, offset = 0;
struct pubkey_hdr *pkh = (struct pubkey_hdr *)pub;
/* add key header */
pkh->version = 1;
pkh->timestamp = 0; /* PEM has no timestamp?? */
pkh->algo = PUBKEY_ALGO_RSA;
pkh->nmpi = 2;
offset += sizeof(*pkh);
// MPIs
len = BN_num_bytes(key->n);
b = BN_num_bits(key->n);
pub[offset++] = b >> 8;
pub[offset++] = b & 0xff;
BN_bn2bin(key->n, &pub[offset]);
offset += len;
len = BN_num_bytes(key->e);
b = BN_num_bits(key->e);
pub[offset++] = b >> 8;
pub[offset++] = b & 0xff;
BN_bn2bin(key->e, &pub[offset]);
offset += len;
return offset;
}
static int read_key(const char *inkey, unsigned char *pub)
{
FILE *fp;
RSA *key = NULL, *key1;
int len;
fp = fopen(inkey, "r");
if (!fp) {
log_errno("read key failed from file %s", inkey);
return -1;
}
key1 = PEM_read_RSA_PUBKEY(fp, &key, NULL, NULL);
fclose(fp);
if (!key1) {
log_errno("PEM_read_RSA_PUBKEY() failed");
return -1;
}
len = key2bin(key, pub);
RSA_free(key);
return len;
}
static void calc_keyid(uint8_t *keyid, char *str, const unsigned char *pkey, int len)
{
uint8_t sha1[SHA_DIGEST_LENGTH];
uint64_t id;
log_debug("pkey:\n");
log_debug_dump(pkey, len);
SHA1(pkey, len, sha1);
//sha1[12 - 19] is exactly keyid from gpg file
memcpy(keyid, sha1 + 12, 8);
log_debug("keyid:\n");
log_debug_dump(keyid, 8);
id = __be64_to_cpup((__be64 *)keyid);
sprintf(str, "%llX", (unsigned long long)id);
log_info("keyid: %s\n", str);
}
static int sign_hash(const unsigned char *hash, int size, const char *keyfile, unsigned char *sig)
{
int err, len;
SHA_CTX ctx;
unsigned char pub[1024];
RSA *key = NULL, *key1;
FILE *fp;
char name[20];
unsigned char sighash[20];
struct signature_hdr *hdr = (struct signature_hdr *)sig;
uint16_t *blen;
log_info("hash: ");
log_dump(hash, size);
fp = fopen(keyfile, "r");
if (!fp) {
log_errno("Unable to open keyfile %s", keyfile);
return -1;
}
key1 = PEM_read_RSAPrivateKey(fp, &key, NULL, NULL);
fclose(fp);
if (!key1) {
log_errno("RSAPrivateKey() failed");
return -1;
}
/* now create a new hash */
hdr->version = 1;
time(&hdr->timestamp);
hdr->algo = PUBKEY_ALGO_RSA;
hdr->hash = DIGEST_ALGO_SHA1;
len = key2bin(key, pub);
calc_keyid(hdr->keyid, name, pub, len);
hdr->nmpi = 1;
SHA1_Init(&ctx);
SHA1_Update(&ctx, hash, size);
SHA1_Update(&ctx, hdr, sizeof(*hdr));
SHA1_Final(sighash, &ctx);
log_info("sighash: ");
log_dump(sighash, sizeof(sighash));
err = RSA_private_encrypt(sizeof(sighash), sighash, sig + sizeof(*hdr) + 2, key, RSA_PKCS1_PADDING);
RSA_free(key);
if (err < 0) {
log_errno("RSA_private_encrypt() failed: %d", err);
return -1;
}
len = err;
/* we add bit length of the signature to make it gnupg compatible */
blen = (uint16_t *)(sig + sizeof(*hdr));
*blen = __cpu_to_be16(len << 3);
len += sizeof(*hdr) + 2;
log_info("evm/ima signature: %d bytes\n", len);
if (!set_xattr || verbose >= LOG_INFO)
dump(sig, len);
return len;
}
static int calc_evm_hash(const char *file, const char *keyfile, unsigned char *hash)
{
struct stat st;
int fd, err;
uint32_t generation;
SHA_CTX ctx;
char **xattrname;
char xattr_value[1024];
fd = open(file, 0);
if (fd < 0) {
log_errno("Unable to open %s", file);
return -1;
}
if (fstat(fd, &st)) {
log_errno("fstat() failed");
return -1;
}
if (ioctl(fd, EXT34_IOC_GETVERSION, &generation)) {
log_errno("ioctl() failed");
return -1;
}
close(fd);
log_info("generation: %u\n", generation);
SHA1_Init(&ctx);
for (xattrname = evm_config_xattrnames; *xattrname != NULL; xattrname++) {
err = getxattr(file, *xattrname, xattr_value, sizeof(xattr_value));
if (err < 0) {
log_info("no attr: %s\n", *xattrname);
continue;
}
//log_debug("name: %s, value: %s, size: %d\n", *xattrname, xattr_value, err);
log_info("name: %s, size: %d\n", *xattrname, err);
log_debug_dump(xattr_value, err);
SHA1_Update(&ctx, xattr_value, err);
}
memset(&hmac_misc, 0, sizeof(hmac_misc));
hmac_misc.ino = st.st_ino;
hmac_misc.generation = generation;
hmac_misc.uid = st.st_uid;
hmac_misc.gid = st.st_gid;
hmac_misc.mode = st.st_mode;
SHA1_Update(&ctx, (const unsigned char*)&hmac_misc, sizeof(hmac_misc));
SHA1_Final(hash, &ctx);
return 0;
}
static int sign_evm(const char *file, const char *key)
{
unsigned char hash[20];
unsigned char sig[1024] = "\x03";
int err;
calc_evm_hash(file, key, hash);
err = sign_hash(hash, sizeof(hash), key, sig + 1);
if (err < 0)
return err;
if (set_xattr) {
err = setxattr(file, "security.evm", sig, err + 1, 0);
if (err < 0) {
log_errno("setxattr failed: %s", file);
return err;
}
}
return 0;
}
static int calc_file_hash(const char *file, uint8_t *hash)
{
EVP_MD_CTX ctx;
const EVP_MD *md;
uint8_t *data;
int err, size, bs = DATA_SIZE;
size_t len;
unsigned int mdlen;
FILE *fp;
data = malloc(bs);
if (!data) {
log_errno("malloc failed");
return -1;
}
fp = fopen(file, "r");
if (!fp) {
log_errno("Unable to open %s", file);
return -1;
}
OpenSSL_add_all_digests();
md = EVP_get_digestbyname(hash_algo);
if (!md) {
log_errno("EVP_get_digestbyname() failed");
return -1;
}
err = EVP_DigestInit(&ctx, md);
if (!err) {
log_errno("EVP_DigestInit() failed");
return -1;
}
for (size = get_fdsize(fileno(fp)); size; size -= len) {
len = MIN(size, bs);
err = fread(data, len, 1, fp);
if (!err) {
if (ferror(fp)) {
log_errno("fread() error\n");
return -1;
}
break;
}
err = EVP_DigestUpdate(&ctx, data, len);
if (!err) {
log_errno("EVP_DigestUpdate() failed");
return -1;
}
}
err = EVP_DigestFinal(&ctx, hash, &mdlen);
if (!err) {
log_errno("EVP_DigestFinal() failed");
return -1;
}
fclose(fp);
free(data);
return mdlen;
}
static int hash_ima(const char *file)
{
unsigned char hash[65] = "\x01";// MAX hash size + 1
int err;
err = calc_file_hash(file, hash + 1);
if (err < 0)
return err;
if (!set_xattr || verbose >= LOG_INFO)
dump(hash, err + 1);
if (set_xattr) {
err = setxattr(file, "security.ima", hash, err + 1, 0);
if (err < 0) {
log_errno("setxattr failed: %s", file);
return err;
}
}
return 0;
}
static int cmd_hash_ima(struct command *cmd)
{
char *file = g_argv[optind++];
if (!file) {
log_err("Parameters missing\n");
print_usage(cmd);
return 1;
}
return hash_ima(file);
}
static int sign_ima(const char *file, const char *key)
{
unsigned char hash[64];
unsigned char sig[1024] = "\x03";
int err;
err = calc_file_hash(file, hash);
if (err < 0)
return err;
err = sign_hash(hash, err, key, sig + 1);
if (err < 0)
return err;
if (set_xattr) {
err = setxattr(file, "security.ima", sig, err + 1, 0);
if (err < 0) {
log_errno("setxattr failed: %s", file);
return err;
}
}
return 0;
}
static int cmd_sign_ima(struct command *cmd)
{
char *key, *file = g_argv[optind++];
if (!file) {
log_err("Parameters missing\n");
print_usage(cmd);
return 1;
}
key = g_argv[optind++];
if (!key)
key = "/etc/keys/privkey_evm.pem";
return sign_ima(file, key);
}
static int cmd_sign_evm(struct command *cmd)
{
char *key, *file = g_argv[optind++];
int err;
if (!file) {
log_err("Parameters missing\n");
print_usage(cmd);
return 1;
}
key = g_argv[optind++];
if (!key)
key = "/etc/keys/privkey_evm.pem";
if (digsig) {
err = sign_ima(file, key);
if (err)
return err;
}
if (digest) {
err = hash_ima(file);
if (err)
return err;
}
return sign_evm(file, key);
}
static int verify_hash(const unsigned char *hash, int size, unsigned char *sig, int siglen, const char *keyfile)
{
int err, len;
SHA_CTX ctx;
unsigned char out[1024];
RSA *key = NULL, *key1;
FILE *fp;
unsigned char sighash[20];
struct signature_hdr *hdr = (struct signature_hdr *)sig;
log_info("hash: ");
log_dump(hash, size);
fp = fopen(keyfile, "r");
if (!fp) {
log_errno("Unable to open keyfile %s", keyfile);
return -1;
}
key1 = PEM_read_RSA_PUBKEY(fp, &key, NULL, NULL);
fclose(fp);
if (!key1) {
log_errno("PEM_read_RSA_PUBKEY() failed");
return -1;
}
SHA1_Init(&ctx);
SHA1_Update(&ctx, hash, size);
SHA1_Update(&ctx, hdr, sizeof(*hdr));
SHA1_Final(sighash, &ctx);
log_info("sighash: ");
log_dump(sighash, sizeof(sighash));
err = RSA_public_decrypt(siglen - sizeof(*hdr) - 2, sig + sizeof(*hdr) + 2, out, key, RSA_PKCS1_PADDING);
RSA_free(key);
if (err < 0) {
log_errno("RSA_public_decrypt() failed: %d", err);
return -1;
}
len = err;
if (len != sizeof(sighash) || memcmp(out, sighash, len) != 0) {
log_errno("Verification failed: %d", err);
return -1;
} else {
//log_info("Verification is OK\n");
printf("Verification is OK\n");
}
return 0;
}
static int verify_evm(const char *file, const char *key)
{
unsigned char hash[20];
unsigned char sig[1024];
int err;
calc_evm_hash(file, key, hash);
err = getxattr(file, "security.evm", sig, sizeof(sig));
if (err < 0) {
log_errno("getxattr failed");
return err;
}
if (sig[0] != 0x03) {
log_errno("security.evm has not signature");
return err;
}
return verify_hash(hash, sizeof(hash), sig + 1, err - 1, key);
}
static int cmd_verify_evm(struct command *cmd)
{
char *key, *file = g_argv[optind++];
if (!file) {
log_err("Parameters missing\n");
print_usage(cmd);
return 1;
}
key = g_argv[optind++];
if (!key)
key = "/etc/keys/pubkey_evm.pem";
return verify_evm(file, key);
}
static int cmd_convert(struct command *cmd)
{
char *inkey, *outkey = NULL;
unsigned char pub[1024];
char name[20];
int len;
uint8_t keyid[8];
inkey = g_argv[optind++];
if (!inkey)
inkey = "/etc/keys/pubkey_evm.pem";
else
outkey = g_argv[optind++];
if (!outkey)
outkey = "pubkey_evm.bin";
log_info("Convert public key %s to %s\n", inkey, outkey);
len = read_key(inkey, pub);
if (len < 0)
return -1;
calc_keyid(keyid, name, pub, len);
bin2file(outkey, name, pub, len);
return 0;
}
static int cmd_import_bin(struct command *cmd)
{
int len;
char *inkey, *ring = NULL;
char *key, name[20];
key_serial_t id;
uint8_t keyid[8];
inkey = g_argv[optind++];
if (!inkey)
inkey = "/etc/keys/pubkey_evm.bin";
else
ring = g_argv[optind++];
if (!ring)
id = KEY_SPEC_USER_KEYRING;
else
id = atoi(ring);
key = file2bin(inkey, &len);
if (!key)
return -1;
calc_keyid(keyid, name, (unsigned char *)key, len);
log_info("Importing public key %s from file %s into keyring %d\n", name, inkey, id);
id = add_key("user", name, key, len, id);
if (id < 0) {
log_errno("add_key failed");
return -1;
}
log_info("keyid: %d\n", id);
printf("%d\n", id);
free(key);
return 0;
}
static int cmd_import(struct command *cmd)
{
char *inkey, *ring = NULL;
unsigned char key[1024];
int id, len;
char name[20];
uint8_t keyid[8];
if (binkey)
return cmd_import_bin(cmd);
inkey = g_argv[optind++];
if (!inkey)
inkey = "/etc/keys/pubkey_evm.pem";
else
ring = g_argv[optind++];
if (!ring)
id = KEY_SPEC_USER_KEYRING;
else
id = atoi(ring);
len = read_key(inkey, key);
if (len < 0)
return -1;
calc_keyid(keyid, name, key, len);
log_info("Importing public key %s from file %s into keyring %d\n", name, inkey, id);
id = add_key("user", name, key, len, id);
if (id < 0) {
log_errno("add_key failed");
return -1;
}
log_info("keyid: %d\n", id);
printf("%d\n", id);
return 0;
}
static void print_usage(struct command *cmd)
{
printf("usage: %s %s\n", cmd->name, cmd->arg ? cmd->arg : "");
}
static void print_full_usage(struct command *cmd)
{
if (cmd->name)
printf("usage: %s %s\n", cmd->name, cmd->arg ? cmd->arg : "");
if (cmd->msg)
printf("description:\n%s", cmd->msg);
}
static int print_command_usage(struct command *cmds, char *command)
{
struct command *cmd;
for (cmd = cmds; cmd->name; cmd++) {
if (strcmp(cmd->name, command) == 0) {
print_full_usage(cmd);
return 0;
}
}
printf("invalid command: %s\n", command);
return 1;
}
static void print_all_usage(struct command *cmds)
{
struct command *cmd;
for (cmd = cmds; cmd->name; cmd++) {
if (cmd->arg)
printf("%s %s\n", cmd->name, cmd->arg);
else if (cmd->msg)
printf("%s", cmd->msg);
}
}
static int call_command(struct command *cmds, char *command)
{
struct command *cmd;
for (cmd = cmds; cmd->name; cmd++) {
if (strcasecmp(cmd->name, command) == 0)
return cmd->func(cmd);
}
printf("Invalid command: %s\n", command);
return -1;
}
static int cmd_help(struct command *cmd)
{
if (!g_argv[optind]) {
print_usage(cmd);
return 0;
} else
return print_command_usage(cmds, g_argv[optind]);
}
static void usage(void)
{
printf("Usage: evmctl <command> [parameters..]\n");
print_all_usage(cmds);
}
struct command cmds[] = {
{"help", cmd_help, 0, "<command>"},
{"import", cmd_import, 0, "[--bin] inkey keyring", "Import public key (PEM/bin) into the keyring.\n" },
{"convert", cmd_convert, 0, "inkey outkey", "Convert PEM public key into IMA/EVM kernel friendly format.\n" },
{"sign", cmd_sign_evm, 0, "[--imahash | --imasig ] file [key]", "Sign file metadata.\n" },
{"verify", cmd_verify_evm, 0, "file", "Verify EVM.\n" },
{"ima_sign", cmd_sign_ima, 0, "file [key]", "Sign file content.\n" },
{"ima_hash", cmd_hash_ima, 0, "file", "Hash file content.\n" },
{0, 0, 0, NULL}
};
static struct option opts[] = {
{"help", 0, 0, 'h'},
{"inkey", 1, 0, 'k'},
{"imasig", 0, 0, 's'},
{"imahash", 0, 0, 'd'},
{"hashalgo", 1, 0, 'a'},
{"bin", 0, 0, 'b'},
{}
};
int main(int argc, char *argv[])
{
int err = 0, c, lind;
g_argv = argv;
g_argc = argc;
while (1) {
c = getopt_long(argc, argv, "hk:vnsda:b", opts, &lind);
if (c == -1)
break;
switch (c) {
case 'h':
usage();
exit(0);
break;
case 'k':
printf("inkey: %s\n", optarg);
break;
case 'v':
verbose++;
break;
case 'd':
digest = 1;
break;
case 's':
digsig = 1;
break;
case 'n':
set_xattr = 0; // do not set Extended Attributes... just print signature
break;
case 'a':
hash_algo = optarg;
break;
case 'b':
binkey = 1;
break;
case '?':
exit(1);
break;
default:
log_err("getopt() returned: %d (%c)\n", c, c);
}
}
if (argv[optind] == NULL)
usage();
else
err = call_command(cmds, argv[optind++]);
return err;
}

6
tests/Makefile.am Normal file
View File

@ -0,0 +1,6 @@
pkglib_PROGRAMS = openclose
openclose_SOURCES = openclose.c
dist_pkglib_SCRIPTS = evm_enable.sh evm_genkey.sh evm_sign_all.sh sign_modules_dir.sh ima_fix_dir.sh

25
tests/evm_enable.sh Executable file
View File

@ -0,0 +1,25 @@
#!/bin/sh
# import EVM HMAC key
keyctl clear @u
keyctl add user kmk "testing123" @u
keyctl add encrypted evm-key "load `cat /etc/keys/evm-key`" @u
# import Moule public key
mod_id=`keyctl newring _module @u`
evmctl import /etc/keys/pubkey_evm.pem $mod_id
# import IMA public key
ima_id=`keyctl newring _ima @u`
evmctl import /etc/keys/pubkey_evm.pem $ima_id
# import EVM public key
evm_id=`keyctl newring _evm @u`
evmctl import /etc/keys/pubkey_evm.pem $evm_id
# enable EVM
echo "1" > /sys/kernel/security/evm
# enable module checking
echo "1" > /sys/kernel/security/ima/module_check

8
tests/evm_genkey.sh Executable file
View File

@ -0,0 +1,8 @@
#!/bin/sh
keyctl add user kmk "testing123" @u
key=`keyctl add encrypted evm-key "new user:kmk 32" @u`
keyctl print $key >/etc/keys/evm-key
keyctl list @u

17
tests/evm_sign_all.sh Executable file
View File

@ -0,0 +1,17 @@
#!/bin/sh
verbose=""
if [ "$1" = "-v" ] ; then
verbose="-v"
shift 1
fi
dir=${1:-/}
echo "Label: $dir"
find $dir \( -fstype rootfs -o -fstype ext3 -o -fstype ext4 \) ! -path "/lib/modules/*" -type f -uid 0 -exec evmctl sign --imahash $verbose '{}' \;
find /lib/modules ! -name "*.ko" -type f -uid 0 -exec evmctl sign --imahash $verbose '{}' \;
# security.ima needs to have signature for modules
find /lib/modules -name "*.ko" -type f -uid 0 -exec evmctl sign --imasig $verbose '{}' \;

8
tests/ima_fix_dir.sh Executable file
View File

@ -0,0 +1,8 @@
#!/bin/sh
dir=${1:-/}
echo "Fixing dir: $dir"
find $dir \( -fstype rootfs -o -fstype ext3 -o -fstype ext4 \) -type f -uid 0 -exec openclose '{}' \;

20
tests/openclose.c Normal file
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@ -0,0 +1,20 @@
#include <unistd.h>
#include <stdio.h>
#include <fcntl.h>
#include <stdlib.h>
int main(int argc, char *argv[])
{
int fd;
fd = open(argv[1], O_RDONLY);
if (fd < 0) {
perror("open()");
exit(1);
}
close(fd);
return 0;
}

15
tests/sign_modules_dir.sh Executable file
View File

@ -0,0 +1,15 @@
#!/bin/sh
verbose=""
if [ "$1" = "-v" ] ; then
verbose="-v"
shift 1
fi
dir=${1:-/lib/modules}
echo "Signing modules: $dir"
find $dir -name "*.ko" -type f -uid 0 -exec evmctl sign --imasig '{}' \;
find $dir ! -name "*.ko" -type f -uid 0 -exec evmctl sign --imahash '{}' \;