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/* $NetBSD: gpgsig.c,v 1.5 2016/07/06 21:00:04 agc Exp $ */
#if HAVE_CONFIG_H
#include "config.h"
#endif
#include <nbcompat.h>
#if HAVE_SYS_CDEFS_H
#include <sys/cdefs.h>
#endif
__RCSID("$NetBSD: gpgsig.c,v 1.5 2016/07/06 21:00:04 agc Exp $");
/*-
* Copyright (c) 2008 Joerg Sonnenberger <joerg@NetBSD.org>.
* All rights reserved.
*
* 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 HOLDERS 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 <sys/wait.h>
#ifndef NETBSD
#include <nbcompat/err.h>
#else
#include <err.h>
#endif
#ifndef NETBSD
#include <nbcompat/stdlib.h>
#else
#include <stdlib.h>
#endif
#include "lib.h"
#include "netpgpverify/verify.h"
int
gpg_verify(const char *content, size_t len, const char *keyring,
const char *sig, size_t sig_len)
{
pgpv_t *pgp;
pgpv_cursor_t *cursor;
static const char hdr1[] = "-----BEGIN PGP SIGNED MESSAGE-----\n";
static const char hdr2[] = "Hash: SHA512\n\n";
ssize_t buflen;
char *buf;
/*
* If there is a detached signature we need to construct a format that
* netpgp can parse, otherwise use as-is.
*/
if (sig_len) {
buf = xasprintf("%s%s%s%s", hdr1, hdr2, content, sig);
buflen = strlen(buf);
} else {
buf = content;
buflen = len;
}
pgp = pgpv_new();
cursor = pgpv_new_cursor();
if (!pgpv_read_pubring(pgp, keyring, -1))
err(EXIT_FAILURE, "cannot read keyring");
if (!pgpv_verify(cursor, pgp, buf, buflen))
errx(EXIT_FAILURE, "unable to verify signature: %s",
pgpv_get_cursor_str(cursor, "why"));
pgpv_close(pgp);
if (sig_len)
free(buf);
return 0;
}
int
detached_gpg_sign(const char *content, size_t len, char **sig, size_t *sig_len,
const char *keyring, const char *user)
{
const char *argv[12], **argvp;
pid_t child;
int fd_in[2], fd_out[2], status;
size_t allocated;
ssize_t ret;
if (gpg_cmd == NULL)
errx(EXIT_FAILURE, "GPG variable not set");
if (pipe(fd_in) == -1)
err(EXIT_FAILURE, "cannot create input pipes");
if (pipe(fd_out) == -1)
err(EXIT_FAILURE, "cannot create output pipes");
child = fork();
if (child == -1)
err(EXIT_FAILURE, "cannot fork GPG process");
if (child == 0) {
close(fd_in[1]);
close(STDIN_FILENO);
if (dup2(fd_in[0], STDIN_FILENO) == -1) {
static const char err_msg[] =
"cannot redirect stdin of GPG process\n";
write(STDERR_FILENO, err_msg, sizeof(err_msg) - 1);
_exit(255);
}
close(fd_in[0]);
close(fd_out[0]);
close(STDOUT_FILENO);
if (dup2(fd_out[1], STDOUT_FILENO) == -1) {
static const char err_msg[] =
"cannot redirect stdout of GPG process\n";
write(STDERR_FILENO, err_msg, sizeof(err_msg) - 1);
_exit(255);
}
close(fd_out[1]);
argvp = argv;
*argvp++ = gpg_cmd;
*argvp++ = "--detach-sign";
*argvp++ = "--armor";
*argvp++ = "--output";
*argvp++ = "-";
if (user != NULL) {
*argvp++ = "--local-user";
*argvp++ = user;
}
if (keyring != NULL) {
*argvp++ = "--no-default-keyring";
*argvp++ = "--secret-keyring";
*argvp++ = keyring;
}
*argvp++ = "-";
*argvp = NULL;
execvp(gpg_cmd, __UNCONST(argv));
_exit(255);
}
close(fd_in[0]);
if (write(fd_in[1], content, len) != (ssize_t)len)
errx(EXIT_FAILURE, "Short read from GPG");
close(fd_in[1]);
allocated = 1024;
*sig = xmalloc(allocated);
*sig_len = 0;
close(fd_out[1]);
while ((ret = read(fd_out[0], *sig + *sig_len,
allocated - *sig_len)) > 0) {
*sig_len += ret;
if (*sig_len == allocated) {
allocated *= 2;
*sig = xrealloc(*sig, allocated);
}
}
close(fd_out[0]);
waitpid(child, &status, 0);
if (status)
errx(EXIT_FAILURE, "GPG could not create signature");
return 0;
}
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