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📄 auth-options.h(2.75 KB)
📄 auth-pam.c(35.07 KB)
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📄 auth2-none.c(2.29 KB)
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📄 auth2-pubkey.c(28.79 KB)
📄 auth2.c(22.23 KB)
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📄 authfd.h(3.05 KB)
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📄 ge25519.c(11.04 KB)
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📄 krb5_config.h(315 B)
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📄 pkcs11.h(41.37 KB)
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📄 poly1305.h(645 B)
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📄 serverloop.c(26.03 KB)
📄 serverloop.h(1000 B)
📄 session.c(66.72 KB)
📄 session.h(2.59 KB)
📄 sftp-client.c(49.62 KB)
📄 sftp-client.h(4.29 KB)
📄 sftp-common.c(6.83 KB)
📄 sftp-common.h(2.02 KB)
📄 sftp-glob.c(3.38 KB)
📄 sftp-server-main.c(1.49 KB)
📄 sftp-server.8(4.98 KB)
📄 sftp-server.c(42.36 KB)
📄 sftp.1(14.53 KB)
📄 sftp.c(59.73 KB)
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📄 smult_curve25519_ref.c(6.71 KB)
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📄 ssh-ed25519.c(4.21 KB)
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📄 ssh-keygen.1(26.5 KB)
📄 ssh-keygen.c(78.58 KB)
📄 ssh-keyscan.1(3.82 KB)
📄 ssh-keyscan.c(17.83 KB)
📄 ssh-keysign.8(2.95 KB)
📄 ssh-keysign.c(8.26 KB)
📄 ssh-pkcs11-client.c(6.65 KB)
📄 ssh-pkcs11-helper.8(1.33 KB)
📄 ssh-pkcs11-helper.c(9.79 KB)
📄 ssh-pkcs11.c(19.56 KB)
📄 ssh-pkcs11.h(1.06 KB)
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📄 sshbuf-getput-basic.c(11.81 KB)
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📄 sshbuf-misc.c(3.53 KB)
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📄 sshd.c(64.58 KB)
📄 sshd_config(3.18 KB)
📄 sshd_config.5(50.55 KB)
📄 ssherr.c(5.04 KB)
📄 ssherr.h(3.28 KB)
📄 sshkey-xmss.c(28.17 KB)
📄 sshkey-xmss.h(2.89 KB)
📄 sshkey.c(102.94 KB)
📄 sshkey.h(10.09 KB)
📄 sshlogin.c(5.25 KB)
📄 sshlogin.h(935 B)
📄 sshpty.c(5.59 KB)
📄 sshpty.h(1.03 KB)
📄 sshtty.c(2.95 KB)
📄 survey.sh.in(1.68 KB)
📄 ttymodes.c(10.1 KB)
📄 ttymodes.h(4.85 KB)
📄 uidswap.c(7.09 KB)
📄 uidswap.h(680 B)
📄 umac.c(44.91 KB)
📄 umac.h(4.58 KB)
📄 umac128.c(414 B)
📄 utf8.c(8.09 KB)
📄 utf8.h(1.17 KB)
📄 uuencode.c(2.94 KB)
📄 uuencode.h(1.5 KB)
📄 verify.c(668 B)
📄 version.h(385 B)
📄 xmalloc.c(2.41 KB)
📄 xmalloc.h(1.08 KB)
📄 xmss_commons.c(630 B)
📄 xmss_commons.h(450 B)
📄 xmss_fast.c(32.16 KB)
📄 xmss_fast.h(3.64 KB)
📄 xmss_hash.c(3.35 KB)
📄 xmss_hash.h(841 B)
📄 xmss_hash_address.c(1.2 KB)
📄 xmss_hash_address.h(836 B)
📄 xmss_wots.c(4.74 KB)
📄 xmss_wots.h(1.86 KB)

Editing: ssh-pkcs11-helper.c

/* $OpenBSD: ssh-pkcs11-helper.c,v 1.14 2018/01/08 15:18:46 markus Exp $ */
/*
 * Copyright (c) 2010 Markus Friedl.  All rights reserved.
 *
 * Permission to use, copy, modify, and distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */

#include "includes.h"

#include <sys/types.h>
#ifdef HAVE_SYS_TIME_H
# include <sys/time.h>
#endif

#include "openbsd-compat/sys-queue.h"

#include <stdarg.h>
#include <string.h>
#include <unistd.h>
#include <errno.h>

#include "xmalloc.h"
#include "sshbuf.h"
#include "log.h"
#include "misc.h"
#include "sshkey.h"
#include "authfd.h"
#include "ssh-pkcs11.h"
#include "ssherr.h"

#ifdef ENABLE_PKCS11

/* borrows code from sftp-server and ssh-agent */

struct pkcs11_keyinfo {
	struct sshkey	*key;
	char		*providername;
	TAILQ_ENTRY(pkcs11_keyinfo) next;
};

TAILQ_HEAD(, pkcs11_keyinfo) pkcs11_keylist;

#define MAX_MSG_LENGTH		10240 /*XXX*/

/* input and output queue */
struct sshbuf *iqueue;
struct sshbuf *oqueue;

static void
add_key(struct sshkey *k, char *name)
{
	struct pkcs11_keyinfo *ki;

ki = xcalloc(1, sizeof(*ki));
	ki->providername = xstrdup(name);
	ki->key = k;
	TAILQ_INSERT_TAIL(&pkcs11_keylist, ki, next);
}

static void
del_keys_by_name(char *name)
{
	struct pkcs11_keyinfo *ki, *nxt;

for (ki = TAILQ_FIRST(&pkcs11_keylist); ki; ki = nxt) {
		nxt = TAILQ_NEXT(ki, next);
		if (!strcmp(ki->providername, name)) {
			TAILQ_REMOVE(&pkcs11_keylist, ki, next);
			free(ki->providername);
			sshkey_free(ki->key);
			free(ki);
		}
	}
}

/* lookup matching 'private' key */
static struct sshkey *
lookup_key(struct sshkey *k)
{
	struct pkcs11_keyinfo *ki;

TAILQ_FOREACH(ki, &pkcs11_keylist, next) {
		debug("check %p %s", ki, ki->providername);
		if (sshkey_equal(k, ki->key))
			return (ki->key);
	}
	return (NULL);
}

static void
send_msg(struct sshbuf *m)
{
	int r;

if ((r = sshbuf_put_stringb(oqueue, m)) != 0)
		fatal("%s: buffer error: %s", __func__, ssh_err(r));
}

static void
process_add(void)
{
	char *name, *pin;
	struct sshkey **keys;
	int r, i, nkeys;
	u_char *blob;
	size_t blen;
	struct sshbuf *msg;

if ((msg = sshbuf_new()) == NULL)
		fatal("%s: sshbuf_new failed", __func__);
	if ((r = sshbuf_get_cstring(iqueue, &name, NULL)) != 0 ||
	    (r = sshbuf_get_cstring(iqueue, &pin, NULL)) != 0)
		fatal("%s: buffer error: %s", __func__, ssh_err(r));
	if ((nkeys = pkcs11_add_provider(name, pin, &keys)) > 0) {
		if ((r = sshbuf_put_u8(msg,
		    SSH2_AGENT_IDENTITIES_ANSWER)) != 0 ||
		    (r = sshbuf_put_u32(msg, nkeys)) != 0)
			fatal("%s: buffer error: %s", __func__, ssh_err(r));
		for (i = 0; i < nkeys; i++) {
			if ((r = sshkey_to_blob(keys[i], &blob, &blen)) != 0) {
				debug("%s: sshkey_to_blob: %s",
				    __func__, ssh_err(r));
				continue;
			}
			if ((r = sshbuf_put_string(msg, blob, blen)) != 0 ||
			    (r = sshbuf_put_cstring(msg, name)) != 0)
				fatal("%s: buffer error: %s",
				    __func__, ssh_err(r));
			free(blob);
			add_key(keys[i], name);
		}
		free(keys);
	} else {
		if ((r = sshbuf_put_u8(msg, SSH_AGENT_FAILURE)) != 0)
			fatal("%s: buffer error: %s", __func__, ssh_err(r));
	}
	free(pin);
	free(name);
	send_msg(msg);
	sshbuf_free(msg);
}

static void
process_del(void)
{
	char *name, *pin;
	struct sshbuf *msg;
	int r;

if ((msg = sshbuf_new()) == NULL)
		fatal("%s: sshbuf_new failed", __func__);
	if ((r = sshbuf_get_cstring(iqueue, &name, NULL)) != 0 ||
	    (r = sshbuf_get_cstring(iqueue, &pin, NULL)) != 0)
		fatal("%s: buffer error: %s", __func__, ssh_err(r));
	del_keys_by_name(name);
	if ((r = sshbuf_put_u8(msg, pkcs11_del_provider(name) == 0 ?
	    SSH_AGENT_SUCCESS : SSH_AGENT_FAILURE)) != 0)
		fatal("%s: buffer error: %s", __func__, ssh_err(r));
	free(pin);
	free(name);
	send_msg(msg);
	sshbuf_free(msg);
}

static void
process_sign(void)
{
	u_char *blob, *data, *signature = NULL;
	size_t blen, dlen, slen = 0;
	int r, ok = -1;
	struct sshkey *key, *found;
	struct sshbuf *msg;

/* XXX support SHA2 signature flags */
	if ((r = sshbuf_get_string(iqueue, &blob, &blen)) != 0 ||
	    (r = sshbuf_get_string(iqueue, &data, &dlen)) != 0 ||
	    (r = sshbuf_get_u32(iqueue, NULL)) != 0)
		fatal("%s: buffer error: %s", __func__, ssh_err(r));

if ((r = sshkey_from_blob(blob, blen, &key)) != 0)
		error("%s: sshkey_from_blob: %s", __func__, ssh_err(r));
	else {
		if ((found = lookup_key(key)) != NULL) {
#ifdef WITH_OPENSSL
			int ret;

slen = RSA_size(key->rsa);
			signature = xmalloc(slen);
			if ((ret = RSA_private_encrypt(dlen, data, signature,
			    found->rsa, RSA_PKCS1_PADDING)) != -1) {
				slen = ret;
				ok = 0;
			}
#endif /* WITH_OPENSSL */
		}
		sshkey_free(key);
	}
	if ((msg = sshbuf_new()) == NULL)
		fatal("%s: sshbuf_new failed", __func__);
	if (ok == 0) {
		if ((r = sshbuf_put_u8(msg, SSH2_AGENT_SIGN_RESPONSE)) != 0 ||
		    (r = sshbuf_put_string(msg, signature, slen)) != 0)
			fatal("%s: buffer error: %s", __func__, ssh_err(r));
	} else {
		if ((r = sshbuf_put_u8(msg, SSH2_AGENT_FAILURE)) != 0)
			fatal("%s: buffer error: %s", __func__, ssh_err(r));
	}
	free(data);
	free(blob);
	free(signature);
	send_msg(msg);
	sshbuf_free(msg);
}

static void
process(void)
{
	u_int msg_len;
	u_int buf_len;
	u_int consumed;
	u_char type;
	const u_char *cp;
	int r;

buf_len = sshbuf_len(iqueue);
	if (buf_len < 5)
		return;		/* Incomplete message. */
	cp = sshbuf_ptr(iqueue);
	msg_len = get_u32(cp);
	if (msg_len > MAX_MSG_LENGTH) {
		error("bad message len %d", msg_len);
		cleanup_exit(11);
	}
	if (buf_len < msg_len + 4)
		return;
	if ((r = sshbuf_consume(iqueue, 4)) != 0 ||
	    (r = sshbuf_get_u8(iqueue, &type)) != 0)
		fatal("%s: buffer error: %s", __func__, ssh_err(r));
	buf_len -= 4;
	switch (type) {
	case SSH_AGENTC_ADD_SMARTCARD_KEY:
		debug("process_add");
		process_add();
		break;
	case SSH_AGENTC_REMOVE_SMARTCARD_KEY:
		debug("process_del");
		process_del();
		break;
	case SSH2_AGENTC_SIGN_REQUEST:
		debug("process_sign");
		process_sign();
		break;
	default:
		error("Unknown message %d", type);
		break;
	}
	/* discard the remaining bytes from the current packet */
	if (buf_len < sshbuf_len(iqueue)) {
		error("iqueue grew unexpectedly");
		cleanup_exit(255);
	}
	consumed = buf_len - sshbuf_len(iqueue);
	if (msg_len < consumed) {
		error("msg_len %d < consumed %d", msg_len, consumed);
		cleanup_exit(255);
	}
	if (msg_len > consumed) {
		if ((r = sshbuf_consume(iqueue, msg_len - consumed)) != 0)
			fatal("%s: buffer error: %s", __func__, ssh_err(r));
	}
}

void
cleanup_exit(int i)
{
	/* XXX */
	_exit(i);
}

int
main(int argc, char **argv)
{
	fd_set *rset, *wset;
	int r, in, out, max, log_stderr = 0;
	ssize_t len, olen, set_size;
	SyslogFacility log_facility = SYSLOG_FACILITY_AUTH;
	LogLevel log_level = SYSLOG_LEVEL_ERROR;
	char buf[4*4096];

extern char *__progname;

ssh_malloc_init();	/* must be called before any mallocs */
	TAILQ_INIT(&pkcs11_keylist);
	pkcs11_init(0);

seed_rng();
	__progname = ssh_get_progname(argv[0]);

log_init(__progname, log_level, log_facility, log_stderr);

in = STDIN_FILENO;
	out = STDOUT_FILENO;

max = 0;
	if (in > max)
		max = in;
	if (out > max)
		max = out;

if ((iqueue = sshbuf_new()) == NULL)
		fatal("%s: sshbuf_new failed", __func__);
	if ((oqueue = sshbuf_new()) == NULL)
		fatal("%s: sshbuf_new failed", __func__);

set_size = howmany(max + 1, NFDBITS) * sizeof(fd_mask);
	rset = xmalloc(set_size);
	wset = xmalloc(set_size);

for (;;) {
		memset(rset, 0, set_size);
		memset(wset, 0, set_size);

/*
		 * Ensure that we can read a full buffer and handle
		 * the worst-case length packet it can generate,
		 * otherwise apply backpressure by stopping reads.
		 */
		if ((r = sshbuf_check_reserve(iqueue, sizeof(buf))) == 0 &&
		    (r = sshbuf_check_reserve(oqueue, MAX_MSG_LENGTH)) == 0)
			FD_SET(in, rset);
		else if (r != SSH_ERR_NO_BUFFER_SPACE)
			fatal("%s: buffer error: %s", __func__, ssh_err(r));

olen = sshbuf_len(oqueue);
		if (olen > 0)
			FD_SET(out, wset);

if (select(max+1, rset, wset, NULL, NULL) < 0) {
			if (errno == EINTR)
				continue;
			error("select: %s", strerror(errno));
			cleanup_exit(2);
		}

/* copy stdin to iqueue */
		if (FD_ISSET(in, rset)) {
			len = read(in, buf, sizeof buf);
			if (len == 0) {
				debug("read eof");
				cleanup_exit(0);
			} else if (len < 0) {
				error("read: %s", strerror(errno));
				cleanup_exit(1);
			} else if ((r = sshbuf_put(iqueue, buf, len)) != 0) {
				fatal("%s: buffer error: %s",
				    __func__, ssh_err(r));
			}
		}
		/* send oqueue to stdout */
		if (FD_ISSET(out, wset)) {
			len = write(out, sshbuf_ptr(oqueue), olen);
			if (len < 0) {
				error("write: %s", strerror(errno));
				cleanup_exit(1);
			} else if ((r = sshbuf_consume(oqueue, len)) != 0) {
				fatal("%s: buffer error: %s",
				    __func__, ssh_err(r));
			}
		}

/*
		 * Process requests from client if we can fit the results
		 * into the output buffer, otherwise stop processing input
		 * and let the output queue drain.
		 */
		if ((r = sshbuf_check_reserve(oqueue, MAX_MSG_LENGTH)) == 0)
			process();
		else if (r != SSH_ERR_NO_BUFFER_SPACE)
			fatal("%s: buffer error: %s", __func__, ssh_err(r));
	}
}
#else /* ENABLE_PKCS11 */
int
main(int argc, char **argv)
{
	extern char *__progname;

__progname = ssh_get_progname(argv[0]);
	log_init(__progname, SYSLOG_LEVEL_ERROR, SYSLOG_FACILITY_AUTH, 0);
	fatal("PKCS#11 support disabled at compile time");
}
#endif /* ENABLE_PKCS11 */

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