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%{
/*-
* Copyright (c) 2004-2018, Juniper Networks, Inc.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* $FreeBSD$
*/
#include <sys/stat.h>
#include <stdio.h>
#include <ctype.h>
#include <err.h>
#include <sysexits.h>
#include <libsecureboot.h>
#include "veriexec.h"
int yylex(void);
void yyerror(const char *);
/* function prototypes */
static int convert(char *fp, unsigned int count, unsigned char *out);
static void do_ioctl(void);
static int get_fingerprint_type(const char *fp_type);
/* ioctl parameter struct */
#ifdef MAXLABELLEN
static struct verified_exec_label_params lparams;
static struct verified_exec_params *params = &lparams.params;
#else
static struct verified_exec_params oparams;
static struct verified_exec_params *params = &oparams;
#endif
#ifndef SHA256_DIGEST_LENGTH
# define SHA_DIGEST_LENGTH br_sha1_SIZE
# define SHA256_DIGEST_LENGTH br_sha256_SIZE
# define SHA384_DIGEST_LENGTH br_sha384_SIZE
#endif
static int fmode;
extern int lineno;
extern int dev_fd;
struct fingerprint_type {
const char *fp_type;
int fp_size;
};
/* static globals */
static const struct fingerprint_type fingerprint_table[] = {
{ "sha1", SHA_DIGEST_LENGTH },
{ "sha256", SHA256_DIGEST_LENGTH },
#if MAXFINGERPRINTLEN > 32
{ "sha384", SHA384_DIGEST_LENGTH },
#endif
{ NULL, 0 }
};
/*
* Indicate to lexer our version.
* A token #>NUMBER will be consumed (and discared)
* by lexer if parser_version > NUMBER
* Otherwise the rest of the line will be discared
* as for a comment.
*/
int parser_version = 1;
%}
%union {
char *string;
int intval;
}
%token EOL
%token <string> EQ
%token <string> PATH
%token <string> STRING
%%
statement: /* empty */
| statement path attributes eol
| statement error eol {
yyclearin; /* discard lookahead */
yyerrok; /* no more error */
fprintf(stderr,
"skipping to next fingerprint\n");
}
;
attributes: /* empty */
| attributes flag
| attributes attr
;
attr: STRING EQ STRING
{
int fptype;
fptype = get_fingerprint_type($1);
/*
* There's only one attribute we care about
*/
if (fingerprint_table[fptype].fp_size) {
strlcpy(params->fp_type, $1, sizeof(params->fp_type));
if (convert($3, fingerprint_table[fptype].fp_size,
params->fingerprint) < 0) {
yyerror("bad fingerprint");
YYERROR;
}
} else if (strcmp($1, "label") == 0) {
static int warned_labels = 0;
#ifdef VERIEXEC_LABEL
strlcpy(lparams.label, $3, sizeof(lparams.label));
VERBOSE(3, ("version=%d label=%s\n", VeriexecVersion,
lparams.label));
if (VeriexecVersion > 1) {
params->flags |= VERIEXEC_LABEL;
} else
#endif
if (!warned_labels) {
warnx("ignoring labels");
warned_labels = 1;
}
} else if (strcmp($1, "mode") == 0) {
fmode = (int)strtol($3, NULL, 8);
}
};
flag: STRING
{
/*
* indirect only matters if the interpreter itself is not
* executable.
*/
if (!strcmp($1, "indirect")) {
params->flags |= VERIEXEC_INDIRECT;
} else if (!strcmp($1, "no_ptrace")) {
params->flags |= VERIEXEC_NOTRACE;
} else if (!strcmp($1, "trusted")) {
params->flags |= VERIEXEC_TRUSTED;
} else if (!strcmp($1, "no_fips")) {
#ifdef VERIEXEC_NOFIPS
params->flags |= VERIEXEC_NOFIPS;
#endif
}
}
;
path: PATH
{
if (strlen($1) >= MAXPATHLEN) {
yyerror("Path >= MAXPATHLEN");
YYERROR;
}
/*
* The majority of files in the manifest are relative
* to the package mount point, but we want absolute paths.
* Prepending '/' is actually all we need.
*/
if (snprintf(params->file, sizeof(params->file), "%s%s%s",
Cdir ? Cdir : "",
($1[0] == '/') ? "" : "/",
$1) >= (int)sizeof(params->file)) {
errx(EX_DATAERR, "cannot form pathname");
}
params->flags = 0;
fmode = -1; /* unknown */
};
eol: EOL
{
if (!YYRECOVERING()) { /* Don't do the ioctl if we saw an error */
do_ioctl();
}
params->fp_type[0] = '\0'; /* invalidate it */
};
%%
void
manifest_parser_init(void)
{
params->fp_type[0] = '\0'; /* invalidate it */
}
int
get_fingerprint_type(const char *fp_type)
{
int i;
for (i = 0; fingerprint_table[i].fp_type; i++)
if (!strcmp(fp_type, fingerprint_table[i].fp_type))
break;
return (i);
}
/*
* Convert: takes the hexadecimal string pointed to by fp and converts
* it to a "count" byte binary number which is stored in the array pointed to
* by out. Returns -1 if the conversion fails.
*/
static int
convert(char *fp, unsigned int count, unsigned char *out)
{
unsigned int i;
int value;
for (i = 0; i < count; i++) {
value = 0;
if (isdigit(fp[i * 2]))
value += fp[i * 2] - '0';
else if (isxdigit(fp[i * 2]))
value += 10 + tolower(fp[i * 2]) - 'a';
else
return (-1);
value <<= 4;
if (isdigit(fp[i * 2 + 1]))
value += fp[i * 2 + 1] - '0';
else if (isxdigit(fp[i * 2 + 1]))
value += 10 + tolower(fp[i * 2 + 1]) - 'a';
else
return (-1);
out[i] = value;
}
return (i);
}
/*
* Perform the load of the fingerprint. Assumes that the fingerprint
* pseudo-device is opened and the file handle is in fd.
*/
static void
do_ioctl(void)
{
struct stat st;
if (params->fp_type[0] == '\0') {
VERBOSE(1,("skipping %s\n", params->file));
return;
}
/*
* See if the path is executable, if not put it on the FILE list.
*/
if (fmode > 0) {
if (!(fmode & (S_IXUSR|S_IXGRP|S_IXOTH))) {
params->flags |= VERIEXEC_FILE;
}
} else if (stat(params->file, &st) == 0) {
if (!(st.st_mode & (S_IXUSR|S_IXGRP|S_IXOTH))) {
params->flags |= VERIEXEC_FILE;
}
}
/*
* We may be forcing some flags...
*/
params->flags |= ForceFlags;
VERBOSE(1, ("loading %s for %s %s flags=%#x\n",
params->fp_type,
(params->flags == VERIEXEC_FILE) ? "file" : "executable",
params->file, params->flags));
#ifdef VERIEXEC_LABEL
if (params->flags & VERIEXEC_LABEL) {
if (ioctl(dev_fd, VERIEXEC_LABEL_LOAD, &lparams) < 0)
warn("cannot update veriexec label for %s",
params->file);
} else
#endif
if (ioctl(dev_fd, VERIEXEC_SIGNED_LOAD, params) < 0)
warn("cannot update veriexec for %s", params->file);
params->fp_type[0] = '\0';
}