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openssh/monitor_wrap.c

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/*
* 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"
RCSID("$OpenBSD: monitor_wrap.c,v 1.7 2002/05/15 15:47:49 mouring Exp $");
#include <openssl/bn.h>
#include <openssl/dh.h>
#include "ssh.h"
#include "dh.h"
#include "kex.h"
#include "auth.h"
#include "buffer.h"
#include "bufaux.h"
#include "packet.h"
#include "mac.h"
#include "log.h"
#include "zlib.h"
#include "monitor.h"
#include "monitor_wrap.h"
#include "xmalloc.h"
#include "atomicio.h"
#include "monitor_fdpass.h"
#include "getput.h"
#include "auth.h"
#include "channels.h"
#include "session.h"
/* Imports */
extern int compat20;
extern Newkeys *newkeys[];
extern z_stream incoming_stream;
extern z_stream outgoing_stream;
extern struct monitor *pmonitor;
extern Buffer input, output;
void
mm_request_send(int socket, enum monitor_reqtype type, Buffer *m)
{
u_char buf[5];
u_int mlen = buffer_len(m);
debug3("%s entering: type %d", __FUNCTION__, type);
PUT_32BIT(buf, mlen + 1);
buf[4] = (u_char) type; /* 1st byte of payload is mesg-type */
if (atomicio(write, socket, buf, sizeof(buf)) != sizeof(buf))
fatal("%s: write", __FUNCTION__);
if (atomicio(write, socket, buffer_ptr(m), mlen) != mlen)
fatal("%s: write", __FUNCTION__);
}
void
mm_request_receive(int socket, Buffer *m)
{
u_char buf[4];
ssize_t res;
u_int msg_len;
debug3("%s entering", __FUNCTION__);
res = atomicio(read, socket, buf, sizeof(buf));
if (res != sizeof(buf)) {
if (res == 0)
fatal_cleanup();
fatal("%s: read: %ld", __FUNCTION__, (long)res);
}
msg_len = GET_32BIT(buf);
if (msg_len > 256 * 1024)
fatal("%s: read: bad msg_len %d", __FUNCTION__, msg_len);
buffer_clear(m);
buffer_append_space(m, msg_len);
res = atomicio(read, socket, buffer_ptr(m), msg_len);
if (res != msg_len)
fatal("%s: read: %ld != msg_len", __FUNCTION__, (long)res);
}
void
mm_request_receive_expect(int socket, enum monitor_reqtype type, Buffer *m)
{
u_char rtype;
debug3("%s entering: type %d", __FUNCTION__, type);
mm_request_receive(socket, m);
rtype = buffer_get_char(m);
if (rtype != type)
fatal("%s: read: rtype %d != type %d", __FUNCTION__,
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", __FUNCTION__);
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", __FUNCTION__);
if ((p = BN_new()) == NULL)
fatal("%s: BN_new failed", __FUNCTION__);
if ((g = BN_new()) == NULL)
fatal("%s: BN_new failed", __FUNCTION__);
buffer_get_bignum2(&m, p);
buffer_get_bignum2(&m, g);
debug3("%s: remaining %d", __FUNCTION__, 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", __FUNCTION__);
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", __FUNCTION__);
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 *login)
{
Buffer m;
struct passwd *pw;
u_int pwlen;
debug3("%s entering", __FUNCTION__);
buffer_init(&m);
buffer_put_cstring(&m, login);
mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PWNAM, &m);
debug3("%s: waiting for MONITOR_ANS_PWNAM", __FUNCTION__);
mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_PWNAM, &m);
if (buffer_get_char(&m) == 0) {
buffer_free(&m);
return (NULL);
}
pw = buffer_get_string(&m, &pwlen);
if (pwlen != sizeof(struct passwd))
fatal("%s: struct passwd size mismatch", __FUNCTION__);
pw->pw_name = buffer_get_string(&m, NULL);
pw->pw_passwd = buffer_get_string(&m, NULL);
pw->pw_gecos = buffer_get_string(&m, NULL);
#ifdef HAVE_PW_CLASS_IN_PASSWD
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);
buffer_free(&m);
return (pw);
}
char* mm_auth2_read_banner(void)
{
Buffer m;
char *banner;
debug3("%s entering", __FUNCTION__);
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);
return (banner);
}
/* Inform the privileged process about service and style */
void
mm_inform_authserv(char *service, char *style)
{
Buffer m;
debug3("%s entering", __FUNCTION__);
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", __FUNCTION__);
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", __FUNCTION__);
mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_AUTHPASSWORD, &m);
authenticated = buffer_get_int(&m);
buffer_free(&m);
debug3("%s: user %sauthenticated",
__FUNCTION__, 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);
}
static void
mm_send_debug(Buffer *m)
{
char *msg;
while (buffer_len(m)) {
msg = buffer_get_string(m, NULL);
debug3("%s: Sending debug: %s", __FUNCTION__, msg);
packet_send_debug("%s", msg);
xfree(msg);
}
}
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;
debug3("%s entering", __FUNCTION__);
/* 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);
xfree(blob);
mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_KEYALLOWED, &m);
debug3("%s: waiting for MONITOR_ANS_KEYALLOWED", __FUNCTION__);
mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_KEYALLOWED, &m);
allowed = buffer_get_int(&m);
/* Send potential debug messages */
mm_send_debug(&m);
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", __FUNCTION__);
/* 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);
xfree(blob);
mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_KEYVERIFY, &m);
debug3("%s: waiting for MONITOR_ANS_KEYVERIFY", __FUNCTION__);
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)", __FUNCTION__, blob, blen);
#ifdef DEBUG_PK
dump_base64(stderr, blob, blen);
#endif
buffer_init(&b);
buffer_append(&b, blob, blen);
newkey = xmalloc(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, &len);
if (len != enc->block_size)
fatal("%s: bad ivlen: expected %d != %d", __FUNCTION__,
enc->block_size, len);
if (enc->name == NULL || cipher_by_name(enc->name) != enc->cipher)
fatal("%s: bad cipher name %s or pointer %p", __FUNCTION__,
enc->name, enc->cipher);
/* Mac structure */
mac->name = buffer_get_string(&b, NULL);
if (mac->name == NULL || mac_init(mac, mac->name) == -1)
fatal("%s: can not init mac %s", __FUNCTION__, 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 lenght: %d > %d", __FUNCTION__, 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 %d", len);
buffer_free(&b);
return (newkey);
}
int
mm_newkeys_to_blob(int mode, u_char **blobp, u_int *lenp)
{
Buffer b;
int len;
u_char *buf;
Enc *enc;
Mac *mac;
Comp *comp;
Newkeys *newkey = newkeys[mode];
debug3("%s: converting %p", __FUNCTION__, newkey);
if (newkey == NULL) {
error("%s: newkey == NULL", __FUNCTION__);
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->block_size);
buffer_put_string(&b, enc->iv, enc->block_size);
/* Mac structure */
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);
buf = xmalloc(len);
memcpy(buf, buffer_ptr(&b), len);
memset(buffer_ptr(&b), 0, len);
buffer_free(&b);
if (lenp != NULL)
*lenp = len;
if (blobp != NULL)
*blobp = buf;
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 *pmonitor)
{
Buffer m;
u_char *blob, *p;
u_int bloblen, plen;
buffer_init(&m);
if (!compat20) {
u_char iv[24];
int ivlen;
buffer_put_int(&m, packet_get_protocol_flags());
buffer_put_int(&m, packet_get_ssh1_cipher());
debug3("%s: Sending ssh1 IV", __FUNCTION__);
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_OUT);
packet_get_keyiv(MODE_IN, iv, ivlen);
buffer_put_string(&m, iv, ivlen);
goto skip;
} else {
/* Kex for rekeying */
mm_send_kex(&m, *pmonitor->m_pkex);
}
debug3("%s: Sending new keys: %p %p",
__FUNCTION__, newkeys[MODE_OUT], newkeys[MODE_IN]);
/* Keys from Kex */
if (!mm_newkeys_to_blob(MODE_OUT, &blob, &bloblen))
fatal("%s: conversion of newkeys failed", __FUNCTION__);
buffer_put_string(&m, blob, bloblen);
xfree(blob);
if (!mm_newkeys_to_blob(MODE_IN, &blob, &bloblen))
fatal("%s: conversion of newkeys failed", __FUNCTION__);
buffer_put_string(&m, blob, bloblen);
xfree(blob);
buffer_put_int(&m, packet_get_seqnr(MODE_OUT));
buffer_put_int(&m, packet_get_seqnr(MODE_IN));
debug3("%s: New keys have been sent", __FUNCTION__);
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);
xfree(p);
plen = packet_get_keycontext(MODE_IN, NULL);
p = xmalloc(plen+1);
packet_get_keycontext(MODE_IN, p);
buffer_put_string(&m, p, plen);
xfree(p);
/* Compression state */
debug3("%s: Sending compression state", __FUNCTION__);
buffer_put_string(&m, &outgoing_stream, sizeof(outgoing_stream));
buffer_put_string(&m, &incoming_stream, sizeof(incoming_stream));
/* Network I/O buffers */
buffer_put_string(&m, buffer_ptr(&input), buffer_len(&input));
buffer_put_string(&m, buffer_ptr(&output), buffer_len(&output));
mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_KEYEXPORT, &m);
debug3("%s: Finished sending state", __FUNCTION__);
buffer_free(&m);
}
int
mm_pty_allocate(int *ptyfd, int *ttyfd, char *namebuf, int namebuflen)
{
Buffer m;
u_char *p;
int success = 0;
buffer_init(&m);
mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PTY, &m);
debug3("%s: waiting for MONITOR_ANS_PTY", __FUNCTION__);
mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_PTY, &m);
success = buffer_get_int(&m);
if (success == 0) {
debug3("%s: pty alloc failed", __FUNCTION__);
buffer_free(&m);
return (0);
}
p = buffer_get_string(&m, NULL);
buffer_free(&m);
strlcpy(namebuf, p, namebuflen); /* Possible truncation */
xfree(p);
*ptyfd = mm_receive_fd(pmonitor->m_recvfd);
*ttyfd = mm_receive_fd(pmonitor->m_recvfd);
/* Success */
return (1);
}
void
mm_session_pty_cleanup2(void *session)
{
Session *s = session;
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 (close(s->ptymaster) < 0)
error("close(s->ptymaster): %s", strerror(errno));
/* unlink pty from session */
s->ttyfd = -1;
}
#ifdef USE_PAM
void
mm_start_pam(char *user)
{
Buffer m;
debug3("%s entering", __FUNCTION__);
buffer_init(&m);
buffer_put_cstring(&m, user);
mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PAM_START, &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 = xmalloc(*numprompts * sizeof(char*));
*echo_on = xmalloc(*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;
int res;
char *challenge;
debug3("%s: entering", __FUNCTION__);
buffer_init(&m);
mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_BSDAUTHQUERY, &m);
mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_BSDAUTHQUERY,
&m);
res = buffer_get_int(&m);
if (res == -1) {
debug3("%s: no challenge", __FUNCTION__);
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", __FUNCTION__, challenge);
return (0);
}
int
mm_bsdauth_respond(void *ctx, u_int numresponses, char **responses)
{
Buffer m;
int authok;
debug3("%s: entering", __FUNCTION__);
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);
}
int
mm_skey_query(void *ctx, char **name, char **infotxt,
u_int *numprompts, char ***prompts, u_int **echo_on)
{
Buffer m;
int len, res;
char *p, *challenge;
debug3("%s: entering", __FUNCTION__);
buffer_init(&m);
mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_SKEYQUERY, &m);
mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_SKEYQUERY,
&m);
res = buffer_get_int(&m);
if (res == -1) {
debug3("%s: no challenge", __FUNCTION__);
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", __FUNCTION__, challenge);
mm_chall_setup(name, infotxt, numprompts, prompts, echo_on);
len = strlen(challenge) + strlen(SKEY_PROMPT) + 1;
p = xmalloc(len);
strlcpy(p, challenge, len);
strlcat(p, SKEY_PROMPT, len);
(*prompts)[0] = p;
xfree(challenge);
return (0);
}
int
mm_skey_respond(void *ctx, u_int numresponses, char **responses)
{
Buffer m;
int authok;
debug3("%s: entering", __FUNCTION__);
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);
}
void
mm_ssh1_session_id(u_char session_id[16])
{
Buffer m;
int i;
debug3("%s entering", __FUNCTION__);
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;
debug3("%s entering", __FUNCTION__);
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);
if (allowed && rkey != NULL) {
blob = buffer_get_string(&m, &blen);
if ((key = key_from_blob(blob, blen)) == NULL)
fatal("%s: key_from_blob failed", __FUNCTION__);
*rkey = key;
xfree(blob);
}
mm_send_debug(&m);
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", __FUNCTION__);
if ((challenge = BN_new()) == NULL)
fatal("%s: BN_new failed", __FUNCTION__);
key->type = KEY_RSA; /* XXX cheat for key_to_blob */
if (key_to_blob(key, &blob, &blen) == 0)
fatal("%s: key_to_blob failed", __FUNCTION__);
key->type = KEY_RSA1;
buffer_init(&m);
buffer_put_string(&m, blob, blen);
xfree(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", __FUNCTION__);
key->type = KEY_RSA; /* XXX cheat for key_to_blob */
if (key_to_blob(key, &blob, &blen) == 0)
fatal("%s: key_to_blob failed", __FUNCTION__);
key->type = KEY_RSA1;
buffer_init(&m);
buffer_put_string(&m, blob, blen);
buffer_put_string(&m, response, 16);
xfree(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);
}
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