/* $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, style, and role */

void

mm_inform_authserv(char *service, char *style, char *role)

{

Buffer m;

debug3("%s entering", __func__);

buffer_init(&m);

buffer_put_cstring(&m, service);

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

buffer_put_cstring(&m, role ? role : "");

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

buffer_free(&m);

}

/* Inform the privileged process about role */

void

mm_inform_authrole(char *role)

{

Buffer m;

debug3("%s entering", __func__);

buffer_init(&m);

buffer_put_cstring(&m, role ? role : "");

mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_AUTHROLE, &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);

buffer_put_cstring(&m, authctxt->user);

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)