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/* $OpenBSD: pgp_check.c,v 1.2 1999/10/07 16:30:32 espie Exp $ */
/*-
* Copyright (c) 1999 Marc Espie.
*
* 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.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by Marc Espie for the OpenBSD
* Project.
*
* THIS SOFTWARE IS PROVIDED BY THE OPENBSD PROJECT 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 OPENBSD
* PROJECT 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.
*/
#include <stdio.h>
#include <errno.h>
#include <assert.h>
#include <unistd.h>
#include <fcntl.h>
#include <paths.h>
#include <stdlib.h>
#include <sys/stat.h>
#include "stand.h"
#include "pgp.h"
#include "gzip.h"
#include "extern.h"
#ifndef _PATH_DEVNULL
#define _PATH_DEVNULL "/dev/null"
#endif
/* transform current process into pgp signature checker -u userid <fd */
static void
pgpcheck(fd, userid, envp)
int fd;
const char *userid;
char *envp[];
{
int fdnull;
pchar argv[6];
int argc = 0;
argv[argc++] = PGP;
argv[argc++] = "+batchmode";
argv[argc++] = "-f";
if (userid) {
argv[argc++] = "-u";
argv[argc++] = (char *)userid;
}
argv[argc++] = NULL;
assert(argc <= sizeof argv / sizeof(pchar));
fdnull = open(_PATH_DEVNULL, O_RDWR);
if (fdnull == -1 ||
dup2(fd, fileno(stdin)) == -1 ||
dup2(fdnull, fileno(stdout)) == -1 ||
close(fdnull) == -1 || close(fd) == -1 ||
execve(PGP, argv, envp) == -1)
perror("launching pgp");
exit(errno);
}
struct pgp_checker {
pid_t id;
int fdout;
int status;
#ifdef DEBUG_DUMP
FILE *out;
#endif
};
void *
new_pgp_checker(h, sign, userid, envp, filename)
struct mygzip_header *h;
struct signature *sign;
const char *userid;
char *envp[];
/*@observer@*/const char *filename;
{
struct pgp_checker *n;
int topgpcheck[2];
assert(sign->type == TAG_PGP);
n = malloc(sizeof *n);
{
struct stat sbuf;
if (stat(PGP, &sbuf) == -1) {
warnx("%s does not exist", PGP);
return NULL;
}
}
if (n == NULL) {
warnx("Can't allocate pgp_checker");
return NULL;
}
if (pipe(topgpcheck) == -1) {
warn("Pgp checker pipe");
free(n);
return NULL;
}
switch(n->id = fork()) {
case -1:
warn("Pgp checker process");
free(n);
return NULL;
case 0:
if (close(topgpcheck[1]) == -1)
exit(errno);
pgpcheck(topgpcheck[0], userid, envp);
/*@notreached@*/
break;
default:
(void)close(topgpcheck[0]);
break;
}
n->fdout = topgpcheck[1];
/* so that subsequent fork() won't duplicate it inadvertently */
(void)fcntl(n->fdout, F_SETFD, FD_CLOEXEC);
#ifdef DEBUG_DUMP
n->out = fopen("compare", "w");
#endif
n->status = PKG_GOODSIG;
pgp_add(n, sign->data, sign->length);
if (gzip_copy_header(h, sign->next, pgp_add, n) == 0) {
warnx("Unexpected header in %s", filename);
n->status = PKG_SIGERROR;
}
return n;
}
void
pgp_add(arg, buffer, length)
void *arg;
const char *buffer;
size_t length;
{
struct pgp_checker *n = arg;
if (n->status == PKG_GOODSIG) {
#ifdef DEBUG_DUMP
fwrite(buffer, 1, length, n->out);
#endif
while (length > 0) {
ssize_t l = write(n->fdout, buffer, length);
if (l == -1) {
n->status = PKG_SIGERROR;
break;
}
length -= l;
buffer += l;
}
}
}
int
pgp_sign_ok(arg)
void *arg;
{
struct pgp_checker *n = arg;
int status = n->status;
#ifdef DEBUG_DUMP
fclose(n->out);
#endif
if (close(n->fdout) != 0)
status = PKG_SIGERROR;
if (reap(n->id) != 0)
status = PKG_BADSIG;
free(n);
return status;
}
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