monitor_wrap.c
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monitor_wrap.c
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	/* $OpenBSD: monitor_wrap.c,v 1.79 2014/02/02 03:44:31 djm Exp $ */
	/*
	* Copyright 2002 Niels Provos <provos@citi.umich.edu>
	* Copyright 2002 Markus Friedl <markus@openbsd.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 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 <sys/types.h>
	#include <sys/uio.h>

	#include <errno.h>
	#include <pwd.h>
	#include <signal.h>
	#include <stdarg.h>
	#include <stdio.h>
	#include <string.h>
	#include <unistd.h>

	#include <openssl/bn.h>
	#include <openssl/dh.h>
	#include <openssl/evp.h>

	#include "openbsd-compat/sys-queue.h"
	#include "xmalloc.h"
	#include "ssh.h"
	#include "dh.h"
	#include "buffer.h"
	#include "key.h"
	#include "cipher.h"
	#include "kex.h"
	#include "hostfile.h"
	#include "auth.h"
	#include "auth-options.h"
	#include "packet.h"
	#include "mac.h"
	#include "log.h"
	#ifdef TARGET_OS_MAC /* XXX Broken krb5 headers on Mac */
	#undef TARGET_OS_MAC
	#include "zlib.h"
	#define TARGET_OS_MAC 1
	#else
	#include "zlib.h"
	#endif
	#include "monitor.h"
	#ifdef GSSAPI
	#include "ssh-gss.h"
	#endif
	#include "monitor_wrap.h"
	#include "atomicio.h"
	#include "monitor_fdpass.h"
	#include "misc.h"
	#include "uuencode.h"

	#include "channels.h"
	#include "session.h"
	#include "servconf.h"
	#include "roaming.h"

	/* Imports */
	extern int compat20;
	extern z_stream incoming_stream;
	extern z_stream outgoing_stream;
	extern struct monitor *pmonitor;
	extern Buffer loginmsg;
	extern ServerOptions options;

	void
	mm_log_handler(LogLevel level, const char msg, void ctx)
	{
	Buffer log_msg;
	struct monitor mon = (struct monitor )ctx;

	if (mon->m_log_sendfd == -1)
	fatal("%s: no log channel", __func__);

	buffer_init(&log_msg);
	/*
	* Placeholder for packet length. Will be filled in with the actual
	* packet length once the packet has been constucted. This saves
	* fragile math.
	*/
	buffer_put_int(&log_msg, 0);

	buffer_put_int(&log_msg, level);
	buffer_put_cstring(&log_msg, msg);
	put_u32(buffer_ptr(&log_msg), buffer_len(&log_msg) - 4);
	if (atomicio(vwrite, mon->m_log_sendfd, buffer_ptr(&log_msg),
	buffer_len(&log_msg)) != buffer_len(&log_msg))
	fatal("%s: write: %s", __func__, strerror(errno));
	buffer_free(&log_msg);
	}

	int
	mm_is_monitor(void)
	{
	/*
	* m_pid is only set in the privileged part, and
	* points to the unprivileged child.
	*/
	return (pmonitor && pmonitor->m_pid > 0);
	}

	void
	mm_request_send(int sock, enum monitor_reqtype type, Buffer *m)
	{
	u_int mlen = buffer_len(m);
	u_char buf[5];

	debug3("%s entering: type %d", __func__, type);

	put_u32(buf, mlen + 1);
	buf[4] = (u_char) type; /* 1st byte of payload is mesg-type */
	if (atomicio(vwrite, sock, buf, sizeof(buf)) != sizeof(buf))
	fatal("%s: write: %s", __func__, strerror(errno));
	if (atomicio(vwrite, sock, buffer_ptr(m), mlen) != mlen)
	fatal("%s: write: %s", __func__, strerror(errno));
	}

	void
	mm_request_receive(int sock, Buffer *m)
	{
	u_char buf[4];
	u_int msg_len;

	debug3("%s entering", __func__);

	if (atomicio(read, sock, buf, sizeof(buf)) != sizeof(buf)) {
	if (errno == EPIPE)
	cleanup_exit(255);
	fatal("%s: read: %s", __func__, strerror(errno));
	}
	msg_len = get_u32(buf);
	if (msg_len > 256 * 1024)
	fatal("%s: read: bad msg_len %d", __func__, msg_len);
	buffer_clear(m);
	buffer_append_space(m, msg_len);
	if (atomicio(read, sock, buffer_ptr(m), msg_len) != msg_len)
	fatal("%s: read: %s", __func__, strerror(errno));
	}

	void
	mm_request_receive_expect(int sock, enum monitor_reqtype type, Buffer *m)
	{
	u_char rtype;

	debug3("%s entering: type %d", __func__, type);

	mm_request_receive(sock, m);
	rtype = buffer_get_char(m);
	if (rtype != type)
	fatal("%s: read: rtype %d != type %d", __func__,
	rtype, type);
	}

	DH *
	mm_choose_dh(int min, int nbits, int max)
	{
	BIGNUM p, g;
	int success = 0;
	Buffer m;

	buffer_init(&m);
	buffer_put_int(&m, min);
	buffer_put_int(&m, nbits);
	buffer_put_int(&m, max);

	mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_MODULI, &m);

	debug3("%s: waiting for MONITOR_ANS_MODULI", __func__);
	mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_MODULI, &m);

	success = buffer_get_char(&m);
	if (success == 0)
	fatal("%s: MONITOR_ANS_MODULI failed", __func__);

	if ((p = BN_new()) == NULL)
	fatal("%s: BN_new failed", __func__);
	if ((g = BN_new()) == NULL)
	fatal("%s: BN_new failed", __func__);
	buffer_get_bignum2(&m, p);
	buffer_get_bignum2(&m, g);

	debug3("%s: remaining %d", __func__, buffer_len(&m));
	buffer_free(&m);

	return (dh_new_group(g, p));
	}

	int
	mm_key_sign(Key key, u_char sigp, u_int lenp, u_char *data, u_int datalen)
	{
	Kex kex = pmonitor->m_pkex;
	Buffer m;

	debug3("%s entering", __func__);

	buffer_init(&m);
	buffer_put_int(&m, kex->host_key_index(key));
	buffer_put_string(&m, data, datalen);

	mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_SIGN, &m);

	debug3("%s: waiting for MONITOR_ANS_SIGN", __func__);
	mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_SIGN, &m);
	*sigp = buffer_get_string(&m, lenp);
	buffer_free(&m);

	return (0);
	}

	struct passwd *
	mm_getpwnamallow(const char *username)
	{
	Buffer m;
	struct passwd *pw;
	u_int len, i;
	ServerOptions *newopts;

	debug3("%s entering", __func__);

	buffer_init(&m);
	buffer_put_cstring(&m, username);

	mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PWNAM, &m);

	debug3("%s: waiting for MONITOR_ANS_PWNAM", __func__);
	mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_PWNAM, &m);

	if (buffer_get_char(&m) == 0) {
	pw = NULL;
	goto out;
	}
	pw = buffer_get_string(&m, &len);
	if (len != sizeof(struct passwd))
	fatal("%s: struct passwd size mismatch", __func__);
	pw->pw_name = buffer_get_string(&m, NULL);
	pw->pw_passwd = buffer_get_string(&m, NULL);
	#ifdef HAVE_STRUCT_PASSWD_PW_GECOS
	pw->pw_gecos = buffer_get_string(&m, NULL);
	#endif
	#ifdef HAVE_STRUCT_PASSWD_PW_CLASS
	pw->pw_class = buffer_get_string(&m, NULL);
	#endif
	pw->pw_dir = buffer_get_string(&m, NULL);
	pw->pw_shell = buffer_get_string(&m, NULL);

	out:
	/* copy options block as a Match directive may have changed some */
	newopts = buffer_get_string(&m, &len);
	if (len != sizeof(*newopts))
	fatal("%s: option block size mismatch", __func__);

	#define M_CP_STROPT(x) do { \
	if (newopts->x != NULL) \
	newopts->x = buffer_get_string(&m, NULL); \
	} while (0)
	#define M_CP_STRARRAYOPT(x, nx) do { \
	for (i = 0; i < newopts->nx; i++) \
	newopts->x[i] = buffer_get_string(&m, NULL); \
	} while (0)
	/* See comment in servconf.h */
	COPY_MATCH_STRING_OPTS();
	#undef M_CP_STROPT
	#undef M_CP_STRARRAYOPT

	copy_set_server_options(&options, newopts, 1);
	free(newopts);

	buffer_free(&m);

	return (pw);
	}

	char *
	mm_auth2_read_banner(void)
	{
	Buffer m;
	char *banner;

	debug3("%s entering", __func__);

	buffer_init(&m);
	mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_AUTH2_READ_BANNER, &m);
	buffer_clear(&m);

	mm_request_receive_expect(pmonitor->m_recvfd,
	MONITOR_ANS_AUTH2_READ_BANNER, &m);
	banner = buffer_get_string(&m, NULL);
	buffer_free(&m);

	/* treat empty banner as missing banner */
	if (strlen(banner) == 0) {
	free(banner);
	banner = NULL;
	}
	return (banner);
	}

	/* Inform the privileged process about service and style */

	void
	mm_inform_authserv(char service, char style)
	{
	Buffer m;

	debug3("%s entering", __func__);

	buffer_init(&m);
	buffer_put_cstring(&m, service);
	buffer_put_cstring(&m, style ? style : "");

	mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_AUTHSERV, &m);

	buffer_free(&m);
	}

	/* Do the password authentication */
	int
	mm_auth_password(Authctxt authctxt, char password)
	{
	Buffer m;
	int authenticated = 0;

	debug3("%s entering", __func__);

	buffer_init(&m);
	buffer_put_cstring(&m, password);
	mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_AUTHPASSWORD, &m);

	debug3("%s: waiting for MONITOR_ANS_AUTHPASSWORD", __func__);
	mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_AUTHPASSWORD, &m);

	authenticated = buffer_get_int(&m);

	buffer_free(&m);

	debug3("%s: user %sauthenticated",
	__func__, authenticated ? "" : "not ");
	return (authenticated);
	}

	int
	mm_user_key_allowed(struct passwd pw, Key key)
	{
	return (mm_key_allowed(MM_USERKEY, NULL, NULL, key));
	}

	int
	mm_hostbased_key_allowed(struct passwd pw, char user, char *host,
	Key *key)
	{
	return (mm_key_allowed(MM_HOSTKEY, user, host, key));
	}

	int
	mm_auth_rhosts_rsa_key_allowed(struct passwd pw, char user,
	char host, Key key)
	{
	int ret;

	key->type = KEY_RSA; /* XXX hack for key_to_blob */
	ret = mm_key_allowed(MM_RSAHOSTKEY, user, host, key);
	key->type = KEY_RSA1;
	return (ret);
	}

	int
	mm_key_allowed(enum mm_keytype type, char user, char host, Key *key)
	{
	Buffer m;
	u_char *blob;
	u_int len;
	int allowed = 0, have_forced = 0;

	debug3("%s entering", __func__);

	/* Convert the key to a blob and the pass it over */
	if (!key_to_blob(key, &blob, &len))
	return (0);

	buffer_init(&m);
	buffer_put_int(&m, type);
	buffer_put_cstring(&m, user ? user : "");
	buffer_put_cstring(&m, host ? host : "");
	buffer_put_string(&m, blob, len);
	free(blob);

	mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_KEYALLOWED, &m);

	debug3("%s: waiting for MONITOR_ANS_KEYALLOWED", __func__);
	mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_KEYALLOWED, &m);

	allowed = buffer_get_int(&m);

	/* fake forced command */
	auth_clear_options();
	have_forced = buffer_get_int(&m);
	forced_command = have_forced ? xstrdup("true") : NULL;

	buffer_free(&m);

	return (allowed);
	}

	/*
	* This key verify needs to send the key type along, because the
	* privileged parent makes the decision if the key is allowed
	* for authentication.
	*/

	int
	mm_key_verify(Key key, u_char sig, u_int siglen, u_char *data, u_int datalen)
	{
	Buffer m;
	u_char *blob;
	u_int len;
	int verified = 0;

	debug3("%s entering", __func__);

	/* Convert the key to a blob and the pass it over */
	if (!key_to_blob(key, &blob, &len))
	return (0);

	buffer_init(&m);
	buffer_put_string(&m, blob, len);
	buffer_put_string(&m, sig, siglen);
	buffer_put_string(&m, data, datalen);
	free(blob);

	mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_KEYVERIFY, &m);

	debug3("%s: waiting for MONITOR_ANS_KEYVERIFY", __func__);
	mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_KEYVERIFY, &m);

	verified = buffer_get_int(&m);

	buffer_free(&m);

	return (verified);
	}

	/* Export key state after authentication */
	Newkeys *
	mm_newkeys_from_blob(u_char *blob, int blen)
	{
	Buffer b;
	u_int len;
	Newkeys *newkey = NULL;
	Enc *enc;
	Mac *mac;
	Comp *comp;

	debug3("%s: %p(%d)", __func__, blob, blen);
	#ifdef DEBUG_PK
	dump_base64(stderr, blob, blen);
	#endif
	buffer_init(&b);
	buffer_append(&b, blob, blen);

	newkey = xcalloc(1, sizeof(*newkey));
	enc = &newkey->enc;
	mac = &newkey->mac;
	comp = &newkey->comp;

	/* Enc structure */
	enc->name = buffer_get_string(&b, NULL);
	buffer_get(&b, &enc->cipher, sizeof(enc->cipher));
	enc->enabled = buffer_get_int(&b);
	enc->block_size = buffer_get_int(&b);
	enc->key = buffer_get_string(&b, &enc->key_len);
	enc->iv = buffer_get_string(&b, &enc->iv_len);

	if (enc->name == NULL \|\| cipher_by_name(enc->name) != enc->cipher)
	fatal("%s: bad cipher name %s or pointer %p", __func__,
	enc->name, enc->cipher);

	/* Mac structure */
	if (cipher_authlen(enc->cipher) == 0) {
	mac->name = buffer_get_string(&b, NULL);
	if (mac->name == NULL \|\| mac_setup(mac, mac->name) == -1)
	fatal("%s: can not setup mac %s", __func__, mac->name);
	mac->enabled = buffer_get_int(&b);
	mac->key = buffer_get_string(&b, &len);
	if (len > mac->key_len)
	fatal("%s: bad mac key length: %u > %d", __func__, len,
	mac->key_len);
	mac->key_len = len;
	}

	/* Comp structure */
	comp->type = buffer_get_int(&b);
	comp->enabled = buffer_get_int(&b);
	comp->name = buffer_get_string(&b, NULL);

	len = buffer_len(&b);
	if (len != 0)
	error("newkeys_from_blob: remaining bytes in blob %u", len);
	buffer_free(&b);
	return (newkey);
	}

	int
	mm_newkeys_to_blob(int mode, u_char *blobp, u_int lenp)
	{
	Buffer b;
	int len;
	Enc *enc;
	Mac *mac;
	Comp *comp;
	Newkeys newkey = (Newkeys )packet_get_newkeys(mode);

	debug3("%s: converting %p", __func__, newkey);

	if (newkey == NULL) {
	error("%s: newkey == NULL", __func__);
	return 0;
	}
	enc = &newkey->enc;
	mac = &newkey->mac;
	comp = &newkey->comp;

	buffer_init(&b);
	/* Enc structure */
	buffer_put_cstring(&b, enc->name);
	/* The cipher struct is constant and shared, you export pointer */
	buffer_append(&b, &enc->cipher, sizeof(enc->cipher));
	buffer_put_int(&b, enc->enabled);
	buffer_put_int(&b, enc->block_size);
	buffer_put_string(&b, enc->key, enc->key_len);
	packet_get_keyiv(mode, enc->iv, enc->iv_len);
	buffer_put_string(&b, enc->iv, enc->iv_len);

	/* Mac structure */
	if (cipher_authlen(enc->cipher) == 0) {
	buffer_put_cstring(&b, mac->name);
	buffer_put_int(&b, mac->enabled);
	buffer_put_string(&b, mac->key, mac->key_len);
	}

	/* Comp structure */
	buffer_put_int(&b, comp->type);
	buffer_put_int(&b, comp->enabled);
	buffer_put_cstring(&b, comp->name);

	len = buffer_len(&b);
	if (lenp != NULL)
	*lenp = len;
	if (blobp != NULL) {
	*blobp = xmalloc(len);
	memcpy(*blobp, buffer_ptr(&b), len);
	}
	explicit_bzero(buffer_ptr(&b), len);
	buffer_free(&b);
	return len;
	}

	static void
	mm_send_kex(Buffer m, Kex kex)
	{
	buffer_put_string(m, kex->session_id, kex->session_id_len);
	buffer_put_int(m, kex->we_need);
	buffer_put_int(m, kex->hostkey_type);
	buffer_put_int(m, kex->kex_type);
	buffer_put_string(m, buffer_ptr(&kex->my), buffer_len(&kex->my));
	buffer_put_string(m, buffer_ptr(&kex->peer), buffer_len(&kex->peer));
	buffer_put_int(m, kex->flags);
	buffer_put_cstring(m, kex->client_version_string);
	buffer_put_cstring(m, kex->server_version_string);
	}

	void
	mm_send_keystate(struct monitor *monitor)
	{
	Buffer m, input, output;
	u_char blob, p;
	u_int bloblen, plen;
	u_int32_t seqnr, packets;
	u_int64_t blocks, bytes;

	buffer_init(&m);

	if (!compat20) {
	u_char iv[24];
	u_char *key;
	u_int ivlen, keylen;

	buffer_put_int(&m, packet_get_protocol_flags());

	buffer_put_int(&m, packet_get_ssh1_cipher());

	debug3("%s: Sending ssh1 KEY+IV", __func__);
	keylen = packet_get_encryption_key(NULL);
	key = xmalloc(keylen+1); /* add 1 if keylen == 0 */
	keylen = packet_get_encryption_key(key);
	buffer_put_string(&m, key, keylen);
	explicit_bzero(key, keylen);
	free(key);

	ivlen = packet_get_keyiv_len(MODE_OUT);
	packet_get_keyiv(MODE_OUT, iv, ivlen);
	buffer_put_string(&m, iv, ivlen);
	ivlen = packet_get_keyiv_len(MODE_IN);
	packet_get_keyiv(MODE_IN, iv, ivlen);
	buffer_put_string(&m, iv, ivlen);
	goto skip;
	} else {
	/* Kex for rekeying */
	mm_send_kex(&m, *monitor->m_pkex);
	}

	debug3("%s: Sending new keys: %p %p",
	__func__, packet_get_newkeys(MODE_OUT),
	packet_get_newkeys(MODE_IN));

	/* Keys from Kex */
	if (!mm_newkeys_to_blob(MODE_OUT, &blob, &bloblen))
	fatal("%s: conversion of newkeys failed", __func__);

	buffer_put_string(&m, blob, bloblen);
	free(blob);

	if (!mm_newkeys_to_blob(MODE_IN, &blob, &bloblen))
	fatal("%s: conversion of newkeys failed", __func__);

	buffer_put_string(&m, blob, bloblen);
	free(blob);

	packet_get_state(MODE_OUT, &seqnr, &blocks, &packets, &bytes);
	buffer_put_int(&m, seqnr);
	buffer_put_int64(&m, blocks);
	buffer_put_int(&m, packets);
	buffer_put_int64(&m, bytes);
	packet_get_state(MODE_IN, &seqnr, &blocks, &packets, &bytes);
	buffer_put_int(&m, seqnr);
	buffer_put_int64(&m, blocks);
	buffer_put_int(&m, packets);
	buffer_put_int64(&m, bytes);

	debug3("%s: New keys have been sent", __func__);
	skip:
	/* More key context */
	plen = packet_get_keycontext(MODE_OUT, NULL);
	p = xmalloc(plen+1);
	packet_get_keycontext(MODE_OUT, p);
	buffer_put_string(&m, p, plen);
	free(p);

	plen = packet_get_keycontext(MODE_IN, NULL);
	p = xmalloc(plen+1);
	packet_get_keycontext(MODE_IN, p);
	buffer_put_string(&m, p, plen);
	free(p);

	/* Compression state */
	debug3("%s: Sending compression state", __func__);
	buffer_put_string(&m, &outgoing_stream, sizeof(outgoing_stream));
	buffer_put_string(&m, &incoming_stream, sizeof(incoming_stream));

	/* Network I/O buffers */
	input = (Buffer *)packet_get_input();
	output = (Buffer *)packet_get_output();
	buffer_put_string(&m, buffer_ptr(input), buffer_len(input));
	buffer_put_string(&m, buffer_ptr(output), buffer_len(output));

	/* Roaming */
	if (compat20) {
	buffer_put_int64(&m, get_sent_bytes());
	buffer_put_int64(&m, get_recv_bytes());
	}

	mm_request_send(monitor->m_recvfd, MONITOR_REQ_KEYEXPORT, &m);
	debug3("%s: Finished sending state", __func__);

	buffer_free(&m);
	}

	int
	mm_pty_allocate(int ptyfd, int ttyfd, char *namebuf, size_t namebuflen)
	{
	Buffer m;
	char p, msg;
	int success = 0, tmp1 = -1, tmp2 = -1;

	/* Kludge: ensure there are fds free to receive the pty/tty */
	if ((tmp1 = dup(pmonitor->m_recvfd)) == -1 \|\|
	(tmp2 = dup(pmonitor->m_recvfd)) == -1) {
	error("%s: cannot allocate fds for pty", __func__);
	if (tmp1 > 0)
	close(tmp1);
	if (tmp2 > 0)
	close(tmp2);
	return 0;
	}
	close(tmp1);
	close(tmp2);

	buffer_init(&m);
	mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PTY, &m);

	debug3("%s: waiting for MONITOR_ANS_PTY", __func__);
	mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_PTY, &m);

	success = buffer_get_int(&m);
	if (success == 0) {
	debug3("%s: pty alloc failed", __func__);
	buffer_free(&m);
	return (0);
	}
	p = buffer_get_string(&m, NULL);
	msg = buffer_get_string(&m, NULL);
	buffer_free(&m);

	strlcpy(namebuf, p, namebuflen); /* Possible truncation */
	free(p);

	buffer_append(&loginmsg, msg, strlen(msg));
	free(msg);

	if ((*ptyfd = mm_receive_fd(pmonitor->m_recvfd)) == -1 \|\|
	(*ttyfd = mm_receive_fd(pmonitor->m_recvfd)) == -1)
	fatal("%s: receive fds failed", __func__);

	/* Success */
	return (1);
	}

	void
	mm_session_pty_cleanup2(Session *s)
	{
	Buffer m;

	if (s->ttyfd == -1)
	return;
	buffer_init(&m);
	buffer_put_cstring(&m, s->tty);
	mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PTYCLEANUP, &m);
	buffer_free(&m);

	/* closed dup'ed master */
	if (s->ptymaster != -1 && close(s->ptymaster) < 0)
	error("close(s->ptymaster/%d): %s",
	s->ptymaster, strerror(errno));

	/* unlink pty from session */
	s->ttyfd = -1;
	}

	#ifdef USE_PAM
	void
	mm_start_pam(Authctxt *authctxt)
	{
	Buffer m;

	debug3("%s entering", __func__);
	if (!options.use_pam)
	fatal("UsePAM=no, but ended up in %s anyway", __func__);

	buffer_init(&m);
	mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PAM_START, &m);

	buffer_free(&m);
	}

	u_int
	mm_do_pam_account(void)
	{
	Buffer m;
	u_int ret;
	char *msg;

	debug3("%s entering", __func__);
	if (!options.use_pam)
	fatal("UsePAM=no, but ended up in %s anyway", __func__);

	buffer_init(&m);
	mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PAM_ACCOUNT, &m);

	mm_request_receive_expect(pmonitor->m_recvfd,
	MONITOR_ANS_PAM_ACCOUNT, &m);
	ret = buffer_get_int(&m);
	msg = buffer_get_string(&m, NULL);
	buffer_append(&loginmsg, msg, strlen(msg));
	free(msg);

	buffer_free(&m);

	debug3("%s returning %d", __func__, ret);

	return (ret);
	}

	void *
	mm_sshpam_init_ctx(Authctxt *authctxt)
	{
	Buffer m;
	int success;

	debug3("%s", __func__);
	buffer_init(&m);
	mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PAM_INIT_CTX, &m);
	debug3("%s: waiting for MONITOR_ANS_PAM_INIT_CTX", __func__);
	mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_PAM_INIT_CTX, &m);
	success = buffer_get_int(&m);
	if (success == 0) {
	debug3("%s: pam_init_ctx failed", __func__);
	buffer_free(&m);
	return (NULL);
	}
	buffer_free(&m);
	return (authctxt);
	}

	int
	mm_sshpam_query(void ctx, char name, char *info,
	u_int num, char prompts, u_int echo_on)
	{
	Buffer m;
	u_int i;
	int ret;

	debug3("%s", __func__);
	buffer_init(&m);
	mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PAM_QUERY, &m);
	debug3("%s: waiting for MONITOR_ANS_PAM_QUERY", __func__);
	mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_PAM_QUERY, &m);
	ret = buffer_get_int(&m);
	debug3("%s: pam_query returned %d", __func__, ret);
	*name = buffer_get_string(&m, NULL);
	*info = buffer_get_string(&m, NULL);
	*num = buffer_get_int(&m);
	if (*num > PAM_MAX_NUM_MSG)
	fatal("%s: recieved %u PAM messages, expected <= %u",
	__func__, *num, PAM_MAX_NUM_MSG);
	prompts = xcalloc((num + 1), sizeof(char *));
	echo_on = xcalloc((num + 1), sizeof(u_int));
	for (i = 0; i < *num; ++i) {
	(*prompts)[i] = buffer_get_string(&m, NULL);
	(*echo_on)[i] = buffer_get_int(&m);
	}
	buffer_free(&m);
	return (ret);
	}

	int
	mm_sshpam_respond(void ctx, u_int num, char *resp)
	{
	Buffer m;
	u_int i;
	int ret;

	debug3("%s", __func__);
	buffer_init(&m);
	buffer_put_int(&m, num);
	for (i = 0; i < num; ++i)
	buffer_put_cstring(&m, resp[i]);
	mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PAM_RESPOND, &m);
	debug3("%s: waiting for MONITOR_ANS_PAM_RESPOND", __func__);
	mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_PAM_RESPOND, &m);
	ret = buffer_get_int(&m);
	debug3("%s: pam_respond returned %d", __func__, ret);
	buffer_free(&m);
	return (ret);
	}

	void
	mm_sshpam_free_ctx(void *ctxtp)
	{
	Buffer m;

	debug3("%s", __func__);
	buffer_init(&m);
	mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PAM_FREE_CTX, &m);
	debug3("%s: waiting for MONITOR_ANS_PAM_FREE_CTX", __func__);
	mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_PAM_FREE_CTX, &m);
	buffer_free(&m);
	}
	#endif /* USE_PAM */

	/* Request process termination */

	void
	mm_terminate(void)
	{
	Buffer m;

	buffer_init(&m);
	mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_TERM, &m);
	buffer_free(&m);
	}

	int
	mm_ssh1_session_key(BIGNUM *num)
	{
	int rsafail;
	Buffer m;

	buffer_init(&m);
	buffer_put_bignum2(&m, num);
	mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_SESSKEY, &m);

	mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_SESSKEY, &m);

	rsafail = buffer_get_int(&m);
	buffer_get_bignum2(&m, num);

	buffer_free(&m);

	return (rsafail);
	}

	static void
	mm_chall_setup(char name, char infotxt, u_int *numprompts,
	char *prompts, u_int echo_on)
	{
	*name = xstrdup("");
	*infotxt = xstrdup("");
	*numprompts = 1;
	prompts = xcalloc(numprompts, sizeof(char *));
	echo_on = xcalloc(numprompts, sizeof(u_int));
	(*echo_on)[0] = 0;
	}

	int
	mm_bsdauth_query(void ctx, char name, char *infotxt,
	u_int numprompts, char prompts, u_int echo_on)
	{
	Buffer m;
	u_int success;
	char *challenge;

	debug3("%s: entering", __func__);

	buffer_init(&m);
	mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_BSDAUTHQUERY, &m);

	mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_BSDAUTHQUERY,
	&m);
	success = buffer_get_int(&m);
	if (success == 0) {
	debug3("%s: no challenge", __func__);
	buffer_free(&m);
	return (-1);
	}

	/* Get the challenge, and format the response */
	challenge = buffer_get_string(&m, NULL);
	buffer_free(&m);

	mm_chall_setup(name, infotxt, numprompts, prompts, echo_on);
	(*prompts)[0] = challenge;

	debug3("%s: received challenge: %s", __func__, challenge);

	return (0);
	}

	int
	mm_bsdauth_respond(void ctx, u_int numresponses, char *responses)
	{
	Buffer m;
	int authok;

	debug3("%s: entering", __func__);
	if (numresponses != 1)
	return (-1);

	buffer_init(&m);
	buffer_put_cstring(&m, responses[0]);
	mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_BSDAUTHRESPOND, &m);

	mm_request_receive_expect(pmonitor->m_recvfd,
	MONITOR_ANS_BSDAUTHRESPOND, &m);

	authok = buffer_get_int(&m);
	buffer_free(&m);

	return ((authok == 0) ? -1 : 0);
	}

	#ifdef SKEY
	int
	mm_skey_query(void ctx, char name, char *infotxt,
	u_int numprompts, char prompts, u_int echo_on)
	{
	Buffer m;
	u_int success;
	char *challenge;

	debug3("%s: entering", __func__);

	buffer_init(&m);
	mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_SKEYQUERY, &m);

	mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_SKEYQUERY,
	&m);
	success = buffer_get_int(&m);
	if (success == 0) {
	debug3("%s: no challenge", __func__);
	buffer_free(&m);
	return (-1);
	}

	/* Get the challenge, and format the response */
	challenge = buffer_get_string(&m, NULL);
	buffer_free(&m);

	debug3("%s: received challenge: %s", __func__, challenge);

	mm_chall_setup(name, infotxt, numprompts, prompts, echo_on);

	xasprintf(*prompts, "%s%s", challenge, SKEY_PROMPT);
	free(challenge);

	return (0);
	}

	int
	mm_skey_respond(void ctx, u_int numresponses, char *responses)
	{
	Buffer m;
	int authok;

	debug3("%s: entering", __func__);
	if (numresponses != 1)
	return (-1);

	buffer_init(&m);
	buffer_put_cstring(&m, responses[0]);
	mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_SKEYRESPOND, &m);

	mm_request_receive_expect(pmonitor->m_recvfd,
	MONITOR_ANS_SKEYRESPOND, &m);

	authok = buffer_get_int(&m);
	buffer_free(&m);

	return ((authok == 0) ? -1 : 0);
	}
	#endif /* SKEY */

	void
	mm_ssh1_session_id(u_char session_id[16])
	{
	Buffer m;
	int i;

	debug3("%s entering", __func__);

	buffer_init(&m);
	for (i = 0; i < 16; i++)
	buffer_put_char(&m, session_id[i]);

	mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_SESSID, &m);
	buffer_free(&m);
	}

	int
	mm_auth_rsa_key_allowed(struct passwd pw, BIGNUM client_n, Key **rkey)
	{
	Buffer m;
	Key *key;
	u_char *blob;
	u_int blen;
	int allowed = 0, have_forced = 0;

	debug3("%s entering", __func__);

	buffer_init(&m);
	buffer_put_bignum2(&m, client_n);

	mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_RSAKEYALLOWED, &m);
	mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_RSAKEYALLOWED, &m);

	allowed = buffer_get_int(&m);

	/* fake forced command */
	auth_clear_options();
	have_forced = buffer_get_int(&m);
	forced_command = have_forced ? xstrdup("true") : NULL;

	if (allowed && rkey != NULL) {
	blob = buffer_get_string(&m, &blen);
	if ((key = key_from_blob(blob, blen)) == NULL)
	fatal("%s: key_from_blob failed", __func__);
	*rkey = key;
	free(blob);
	}
	buffer_free(&m);

	return (allowed);
	}

	BIGNUM *
	mm_auth_rsa_generate_challenge(Key *key)
	{
	Buffer m;
	BIGNUM *challenge;
	u_char *blob;
	u_int blen;

	debug3("%s entering", __func__);

	if ((challenge = BN_new()) == NULL)
	fatal("%s: BN_new failed", __func__);

	key->type = KEY_RSA; /* XXX cheat for key_to_blob */
	if (key_to_blob(key, &blob, &blen) == 0)
	fatal("%s: key_to_blob failed", __func__);
	key->type = KEY_RSA1;

	buffer_init(&m);
	buffer_put_string(&m, blob, blen);
	free(blob);

	mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_RSACHALLENGE, &m);
	mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_RSACHALLENGE, &m);

	buffer_get_bignum2(&m, challenge);
	buffer_free(&m);

	return (challenge);
	}

	int
	mm_auth_rsa_verify_response(Key key, BIGNUM p, u_char response[16])
	{
	Buffer m;
	u_char *blob;
	u_int blen;
	int success = 0;

	debug3("%s entering", __func__);

	key->type = KEY_RSA; /* XXX cheat for key_to_blob */
	if (key_to_blob(key, &blob, &blen) == 0)
	fatal("%s: key_to_blob failed", __func__);
	key->type = KEY_RSA1;

	buffer_init(&m);
	buffer_put_string(&m, blob, blen);
	buffer_put_string(&m, response, 16);
	free(blob);

	mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_RSARESPONSE, &m);
	mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_RSARESPONSE, &m);

	success = buffer_get_int(&m);
	buffer_free(&m);

	return (success);
	}

	#ifdef SSH_AUDIT_EVENTS
	void
	mm_audit_event(ssh_audit_event_t event)
	{
	Buffer m;

	debug3("%s entering", __func__);

	buffer_init(&m);
	buffer_put_int(&m, event);

	mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_AUDIT_EVENT, &m);
	buffer_free(&m);
	}

	void
	mm_audit_run_command(const char *command)
	{
	Buffer m;

	debug3("%s entering command %s", __func__, command);

	buffer_init(&m);
	buffer_put_cstring(&m, command);

	mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_AUDIT_COMMAND, &m);
	buffer_free(&m);
	}
	#endif /* SSH_AUDIT_EVENTS */

	#ifdef GSSAPI
	OM_uint32
	mm_ssh_gssapi_server_ctx(Gssctxt **ctx, gss_OID goid)
	{
	Buffer m;
	OM_uint32 major;

	/* Client doesn't get to see the context */
	*ctx = NULL;

	buffer_init(&m);
	buffer_put_string(&m, goid->elements, goid->length);

	mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_GSSSETUP, &m);
	mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_GSSSETUP, &m);

	major = buffer_get_int(&m);

	buffer_free(&m);
	return (major);
	}

	OM_uint32
	mm_ssh_gssapi_accept_ctx(Gssctxt ctx, gss_buffer_desc in,
	gss_buffer_desc out, OM_uint32 flags)
	{
	Buffer m;
	OM_uint32 major;
	u_int len;

	buffer_init(&m);
	buffer_put_string(&m, in->value, in->length);

	mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_GSSSTEP, &m);
	mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_GSSSTEP, &m);

	major = buffer_get_int(&m);
	out->value = buffer_get_string(&m, &len);
	out->length = len;
	if (flags)
	*flags = buffer_get_int(&m);

	buffer_free(&m);

	return (major);
	}

	OM_uint32
	mm_ssh_gssapi_checkmic(Gssctxt *ctx, gss_buffer_t gssbuf, gss_buffer_t gssmic)
	{
	Buffer m;
	OM_uint32 major;

	buffer_init(&m);
	buffer_put_string(&m, gssbuf->value, gssbuf->length);
	buffer_put_string(&m, gssmic->value, gssmic->length);

	mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_GSSCHECKMIC, &m);
	mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_GSSCHECKMIC,
	&m);

	major = buffer_get_int(&m);
	buffer_free(&m);
	return(major);
	}

	int
	mm_ssh_gssapi_userok(char *user)
	{
	Buffer m;
	int authenticated = 0;

	buffer_init(&m);

	mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_GSSUSEROK, &m);
	mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_GSSUSEROK,
	&m);

	authenticated = buffer_get_int(&m);

	buffer_free(&m);
	debug3("%s: user %sauthenticated",__func__, authenticated ? "" : "not ");
	return (authenticated);
	}
	#endif /* GSSAPI */

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