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/*
*------------------------------------------------------------------
* sign.c - sign a binary
*
* Jan 2010, George Spelvin
*
* Copyright (c) 2010 Cisco and/or its affiliates.
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at:
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*------------------------------------------------------------------
*/
#include <stdio.h>
#include <stdlib.h>
#include <sys/types.h>
#include <sys/mman.h>
#include <sys/stat.h>
#include <netinet/in.h>
#include <signal.h>
#include <pthread.h>
#include <unistd.h>
#include <time.h>
#include <fcntl.h>
#include <string.h>
#include <vppinfra/clib.h>
#include <vppinfra/vec.h>
#include <vppinfra/hash.h>
#include <vppinfra/bitmap.h>
#include <vppinfra/fifo.h>
#include <vppinfra/time.h>
#include <vppinfra/mheap.h>
#include <vppinfra/heap.h>
#include <vppinfra/pool.h>
#include <vppinfra/format.h>
#include <vppinfra/error.h>
#include <vppinfra/unix.h>
/* Elf-file magic number */
static unsigned char elfmag[4] = {0x7F, 'E', 'L', 'F'};
int add_signature (char *file, u8 *sigfile)
{
clib_error_t *e;
u8 *sigcontents;
uword siglen;
struct stat statb;
int fd;
char magic[4];
int i;
if ((e = unix_file_contents ((char *)sigfile, &sigcontents))) {
fformat(stderr, "%v", e->what);
clib_error_free (e);
return 1;
}
siglen = vec_len (sigcontents);
vec_add1(sigcontents, (siglen>>24)&0xff);
vec_add1(sigcontents, (siglen>>16)&0xff);
vec_add1(sigcontents, (siglen>> 8)&0xff);
vec_add1(sigcontents, (siglen>> 0)&0xff);
/* remember the desired file mode */
if (stat(file, &statb) < 0) {
fformat(stderr, "Couldn't stat %s\n", file);
return 1;
}
/* Skip empty / short trout. Don't complain */
if (statb.st_size < 4) {
return 0;
}
/* make it writeable */
chmod (file, 0777);
fd = open (file, O_RDWR | O_APPEND, 0755);
if (fd < 0) {
fformat (stderr, "Couldn't append to %s\n", file);
return 1;
}
/*
* We feed this program a list of files with execute permission.
* Signing a shell script makes it taste bad, etc. etc.
*/
if (read(fd, magic, 4) != 4) {
fformat (stderr, "Couldn't read magic number from %s\n", file);
}
for (i = 0; i < 4; i++) {
if (magic[i] != elfmag[i]) {
goto skip_write;
}
}
if (write (fd, sigcontents, vec_len(sigcontents))
!= vec_len (sigcontents)) {
fformat (stderr, "Write error on %s\n", file);
return 1;
}
skip_write:
close(fd);
/* restore the file mode */
chmod (file, statb.st_mode);
return 0;
}
int mypid;
int sign_one_file (char *pemfile, char *password, char *file)
{
u8 *cmd;
u8 *t1, *t2;
t1 = format (0, "/tmp/sha256-%d%c", mypid, 0);
t2 = format (0, "/tmp/sig-%d%c", mypid, 0);
cmd = format (0, "openssl dgst -sha256 < %s > %s%c", file, t1, 0);
if (system((char *)cmd)) {
barf:
clib_warning("'%s' failed", cmd);
return 1;
}
vec_free(cmd);
cmd = format (0, "openssl rsautl -inkey %s -in %s -out %s ",
pemfile, t1, t2);
cmd = format (cmd, "-passin pass:%s -sign%c", password, 0);
if (system((char *)cmd))
goto barf;
vec_free(cmd);
if (add_signature (file, t2))
return 1;
unlink ((char *)t1);
unlink ((char *)t2);
return (0);
}
/* usage: sign <foo.pem> <password> <list-of-files> */
int main (int argc, char **argv)
{
int i;
mypid = getpid();
if (argc < 4) {
fformat(stderr, "usage: %s <xxx.pem> <password> <list-of-files>\n",
argv[0]);
exit (1);
}
for (i = 3; i < argc; i++) {
if (sign_one_file (argv[1], argv[2], argv[i])) {
fformat(stderr, "Left unsigned: %s\n", argv[i]);
}
}
exit (0);
}
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