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📄 poly1305.h(645 B)
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📄 sshkey.h(10.09 KB)
📄 sshlogin.c(5.25 KB)
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📄 xmss_wots.c(4.74 KB)
📄 xmss_wots.h(1.86 KB)

Editing: ssh-keysign.c

/* $OpenBSD: ssh-keysign.c,v 1.55 2018/07/27 05:34:42 dtucker Exp $ */
/*
 * Copyright (c) 2002 Markus Friedl.  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 AUTHOR ``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 AUTHOR 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 "includes.h"

#include <fcntl.h>
#ifdef HAVE_PATHS_H
#include <paths.h>
#endif
#include <pwd.h>
#include <stdarg.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <errno.h>

#ifdef WITH_OPENSSL
#include <openssl/evp.h>
#include <openssl/rand.h>
#include <openssl/rsa.h>
#endif

#include "xmalloc.h"
#include "log.h"
#include "sshkey.h"
#include "ssh.h"
#include "ssh2.h"
#include "misc.h"
#include "sshbuf.h"
#include "authfile.h"
#include "msg.h"
#include "canohost.h"
#include "pathnames.h"
#include "readconf.h"
#include "uidswap.h"
#include "sshkey.h"
#include "ssherr.h"

struct ssh *active_state = NULL; /* XXX needed for linking */

extern char *__progname;

static int
valid_request(struct passwd *pw, char *host, struct sshkey **ret,
    u_char *data, size_t datalen)
{
	struct sshbuf *b;
	struct sshkey *key = NULL;
	u_char type, *pkblob;
	char *p;
	size_t blen, len;
	char *pkalg, *luser;
	int r, pktype, fail;

if (ret != NULL)
		*ret = NULL;
	fail = 0;

if ((b = sshbuf_from(data, datalen)) == NULL)
		fatal("%s: sshbuf_from failed", __func__);

/* session id, currently limited to SHA1 (20 bytes) or SHA256 (32) */
	if ((r = sshbuf_get_string(b, NULL, &len)) != 0)
		fatal("%s: buffer error: %s", __func__, ssh_err(r));
	if (len != 20 && len != 32)
		fail++;

if ((r = sshbuf_get_u8(b, &type)) != 0)
		fatal("%s: buffer error: %s", __func__, ssh_err(r));
	if (type != SSH2_MSG_USERAUTH_REQUEST)
		fail++;

/* server user */
	if ((r = sshbuf_skip_string(b)) != 0)
		fatal("%s: buffer error: %s", __func__, ssh_err(r));

/* service */
	if ((r = sshbuf_get_cstring(b, &p, NULL)) != 0)
		fatal("%s: buffer error: %s", __func__, ssh_err(r));
	if (strcmp("ssh-connection", p) != 0)
		fail++;
	free(p);

/* method */
	if ((r = sshbuf_get_cstring(b, &p, NULL)) != 0)
		fatal("%s: buffer error: %s", __func__, ssh_err(r));
	if (strcmp("hostbased", p) != 0)
		fail++;
	free(p);

/* pubkey */
	if ((r = sshbuf_get_cstring(b, &pkalg, NULL)) != 0 ||
	    (r = sshbuf_get_string(b, &pkblob, &blen)) != 0)
		fatal("%s: buffer error: %s", __func__, ssh_err(r));

pktype = sshkey_type_from_name(pkalg);
	if (pktype == KEY_UNSPEC)
		fail++;
	else if ((r = sshkey_from_blob(pkblob, blen, &key)) != 0) {
		error("%s: bad key blob: %s", __func__, ssh_err(r));
		fail++;
	} else if (key->type != pktype)
		fail++;
	free(pkalg);
	free(pkblob);

/* client host name, handle trailing dot */
	if ((r = sshbuf_get_cstring(b, &p, &len)) != 0)
		fatal("%s: buffer error: %s", __func__, ssh_err(r));
	debug2("%s: check expect chost %s got %s", __func__, host, p);
	if (strlen(host) != len - 1)
		fail++;
	else if (p[len - 1] != '.')
		fail++;
	else if (strncasecmp(host, p, len - 1) != 0)
		fail++;
	free(p);

/* local user */
	if ((r = sshbuf_get_cstring(b, &luser, NULL)) != 0)
		fatal("%s: buffer error: %s", __func__, ssh_err(r));

if (strcmp(pw->pw_name, luser) != 0)
		fail++;
	free(luser);

/* end of message */
	if (sshbuf_len(b) != 0)
		fail++;
	sshbuf_free(b);

debug3("%s: fail %d", __func__, fail);

if (fail)
		sshkey_free(key);
	else if (ret != NULL)
		*ret = key;

return (fail ? -1 : 0);
}

int
main(int argc, char **argv)
{
	struct sshbuf *b;
	Options options;
#define NUM_KEYTYPES 5
	struct sshkey *keys[NUM_KEYTYPES], *key = NULL;
	struct passwd *pw;
	int r, key_fd[NUM_KEYTYPES], i, found, version = 2, fd;
	u_char *signature, *data, rver;
	char *host, *fp;
	size_t slen, dlen;
#ifdef WITH_OPENSSL
	u_int32_t rnd[256];
#endif

ssh_malloc_init();	/* must be called before any mallocs */
	if (pledge("stdio rpath getpw dns id", NULL) != 0)
		fatal("%s: pledge: %s", __progname, strerror(errno));

/* Ensure that stdin and stdout are connected */
	if ((fd = open(_PATH_DEVNULL, O_RDWR)) < 2)
		exit(1);
	/* Leave /dev/null fd iff it is attached to stderr */
	if (fd > 2)
		close(fd);

i = 0;
	/* XXX This really needs to read sshd_config for the paths */
	key_fd[i++] = open(_PATH_HOST_DSA_KEY_FILE, O_RDONLY);
	key_fd[i++] = open(_PATH_HOST_ECDSA_KEY_FILE, O_RDONLY);
	key_fd[i++] = open(_PATH_HOST_ED25519_KEY_FILE, O_RDONLY);
	key_fd[i++] = open(_PATH_HOST_XMSS_KEY_FILE, O_RDONLY);
	key_fd[i++] = open(_PATH_HOST_RSA_KEY_FILE, O_RDONLY);

if ((pw = getpwuid(getuid())) == NULL)
		fatal("getpwuid failed");
	pw = pwcopy(pw);

permanently_set_uid(pw);

seed_rng();

#ifdef DEBUG_SSH_KEYSIGN
	log_init("ssh-keysign", SYSLOG_LEVEL_DEBUG3, SYSLOG_FACILITY_AUTH, 0);
#endif

/* verify that ssh-keysign is enabled by the admin */
	initialize_options(&options);
	(void)read_config_file(_PATH_HOST_CONFIG_FILE, pw, "", "", &options, 0);
	fill_default_options(&options);
	if (options.enable_ssh_keysign != 1)
		fatal("ssh-keysign not enabled in %s",
		    _PATH_HOST_CONFIG_FILE);

for (i = found = 0; i < NUM_KEYTYPES; i++) {
		if (key_fd[i] != -1)
			found = 1;
	}
	if (found == 0)
		fatal("could not open any host key");

#ifdef WITH_OPENSSL
	OpenSSL_add_all_algorithms();
	arc4random_buf(rnd, sizeof(rnd));
	RAND_seed(rnd, sizeof(rnd));
#endif

found = 0;
	for (i = 0; i < NUM_KEYTYPES; i++) {
		keys[i] = NULL;
		if (key_fd[i] == -1)
			continue;
		r = sshkey_load_private_type_fd(key_fd[i], KEY_UNSPEC,
		    NULL, &key, NULL);
		close(key_fd[i]);
		if (r != 0)
			debug("parse key %d: %s", i, ssh_err(r));
		else if (key != NULL) {
			keys[i] = key;
			found = 1;
		}
	}
	if (!found)
		fatal("no hostkey found");

if (pledge("stdio dns", NULL) != 0)
		fatal("%s: pledge: %s", __progname, strerror(errno));

if ((b = sshbuf_new()) == NULL)
		fatal("%s: sshbuf_new failed", __progname);
	if (ssh_msg_recv(STDIN_FILENO, b) < 0)
		fatal("ssh_msg_recv failed");
	if ((r = sshbuf_get_u8(b, &rver)) != 0)
		fatal("%s: buffer error: %s", __progname, ssh_err(r));
	if (rver != version)
		fatal("bad version: received %d, expected %d", rver, version);
	if ((r = sshbuf_get_u32(b, (u_int *)&fd)) != 0)
		fatal("%s: buffer error: %s", __progname, ssh_err(r));
	if (fd < 0 || fd == STDIN_FILENO || fd == STDOUT_FILENO)
		fatal("bad fd");
	if ((host = get_local_name(fd)) == NULL)
		fatal("cannot get local name for fd");

if ((r = sshbuf_get_string(b, &data, &dlen)) != 0)
		fatal("%s: buffer error: %s", __progname, ssh_err(r));
	if (valid_request(pw, host, &key, data, dlen) < 0)
		fatal("not a valid request");
	free(host);

found = 0;
	for (i = 0; i < NUM_KEYTYPES; i++) {
		if (keys[i] != NULL &&
		    sshkey_equal_public(key, keys[i])) {
			found = 1;
			break;
		}
	}
	if (!found) {
		if ((fp = sshkey_fingerprint(key, options.fingerprint_hash,
		    SSH_FP_DEFAULT)) == NULL)
			fatal("%s: sshkey_fingerprint failed", __progname);
		fatal("no matching hostkey found for key %s %s",
		    sshkey_type(key), fp ? fp : "");
	}

if ((r = sshkey_sign(keys[i], &signature, &slen, data, dlen, NULL, 0))
	    != 0)
		fatal("sshkey_sign failed: %s", ssh_err(r));
	free(data);

/* send reply */
	sshbuf_reset(b);
	if ((r = sshbuf_put_string(b, signature, slen)) != 0)
		fatal("%s: buffer error: %s", __progname, ssh_err(r));
	if (ssh_msg_send(STDOUT_FILENO, version, b) == -1)
		fatal("ssh_msg_send failed");

return (0);
}

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