942 lines
22 KiB
C
942 lines
22 KiB
C
/*
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* Copyright 2002 Niels Provos <provos@citi.umich.edu>
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* Copyright 2002 Markus Friedl <markus@openbsd.org>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "includes.h"
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RCSID("$OpenBSD: monitor_wrap.c,v 1.11 2002/06/19 18:01:00 markus Exp $");
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#include <openssl/bn.h>
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#include <openssl/dh.h>
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#include "ssh.h"
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#include "dh.h"
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#include "kex.h"
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#include "auth.h"
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#include "buffer.h"
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#include "bufaux.h"
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#include "packet.h"
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#include "mac.h"
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#include "log.h"
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#include "zlib.h"
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#include "monitor.h"
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#include "monitor_wrap.h"
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#include "xmalloc.h"
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#include "atomicio.h"
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#include "monitor_fdpass.h"
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#include "getput.h"
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#include "auth.h"
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#include "channels.h"
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#include "session.h"
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/* Imports */
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extern int compat20;
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extern Newkeys *newkeys[];
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extern z_stream incoming_stream;
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extern z_stream outgoing_stream;
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extern struct monitor *pmonitor;
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extern Buffer input, output;
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void
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mm_request_send(int socket, enum monitor_reqtype type, Buffer *m)
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{
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u_char buf[5];
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u_int mlen = buffer_len(m);
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debug3("%s entering: type %d", __func__, type);
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PUT_32BIT(buf, mlen + 1);
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buf[4] = (u_char) type; /* 1st byte of payload is mesg-type */
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if (atomicio(write, socket, buf, sizeof(buf)) != sizeof(buf))
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fatal("%s: write", __func__);
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if (atomicio(write, socket, buffer_ptr(m), mlen) != mlen)
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fatal("%s: write", __func__);
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}
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void
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mm_request_receive(int socket, Buffer *m)
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{
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u_char buf[4];
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ssize_t res;
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u_int msg_len;
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debug3("%s entering", __func__);
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res = atomicio(read, socket, buf, sizeof(buf));
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if (res != sizeof(buf)) {
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if (res == 0)
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fatal_cleanup();
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fatal("%s: read: %ld", __func__, (long)res);
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}
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msg_len = GET_32BIT(buf);
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if (msg_len > 256 * 1024)
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fatal("%s: read: bad msg_len %d", __func__, msg_len);
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buffer_clear(m);
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buffer_append_space(m, msg_len);
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res = atomicio(read, socket, buffer_ptr(m), msg_len);
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if (res != msg_len)
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fatal("%s: read: %ld != msg_len", __func__, (long)res);
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}
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void
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mm_request_receive_expect(int socket, enum monitor_reqtype type, Buffer *m)
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{
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u_char rtype;
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debug3("%s entering: type %d", __func__, type);
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mm_request_receive(socket, m);
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rtype = buffer_get_char(m);
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if (rtype != type)
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fatal("%s: read: rtype %d != type %d", __func__,
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rtype, type);
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}
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DH *
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mm_choose_dh(int min, int nbits, int max)
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{
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BIGNUM *p, *g;
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int success = 0;
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Buffer m;
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buffer_init(&m);
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buffer_put_int(&m, min);
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buffer_put_int(&m, nbits);
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buffer_put_int(&m, max);
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mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_MODULI, &m);
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debug3("%s: waiting for MONITOR_ANS_MODULI", __func__);
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mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_MODULI, &m);
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success = buffer_get_char(&m);
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if (success == 0)
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fatal("%s: MONITOR_ANS_MODULI failed", __func__);
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if ((p = BN_new()) == NULL)
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fatal("%s: BN_new failed", __func__);
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if ((g = BN_new()) == NULL)
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fatal("%s: BN_new failed", __func__);
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buffer_get_bignum2(&m, p);
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buffer_get_bignum2(&m, g);
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debug3("%s: remaining %d", __func__, buffer_len(&m));
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buffer_free(&m);
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return (dh_new_group(g, p));
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}
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int
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mm_key_sign(Key *key, u_char **sigp, u_int *lenp, u_char *data, u_int datalen)
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{
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Kex *kex = *pmonitor->m_pkex;
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Buffer m;
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debug3("%s entering", __func__);
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buffer_init(&m);
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buffer_put_int(&m, kex->host_key_index(key));
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buffer_put_string(&m, data, datalen);
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mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_SIGN, &m);
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debug3("%s: waiting for MONITOR_ANS_SIGN", __func__);
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mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_SIGN, &m);
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*sigp = buffer_get_string(&m, lenp);
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buffer_free(&m);
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return (0);
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}
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struct passwd *
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mm_getpwnamallow(const char *login)
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{
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Buffer m;
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struct passwd *pw;
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u_int pwlen;
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debug3("%s entering", __func__);
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buffer_init(&m);
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buffer_put_cstring(&m, login);
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mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_PWNAM, &m);
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debug3("%s: waiting for MONITOR_ANS_PWNAM", __func__);
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mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_PWNAM, &m);
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if (buffer_get_char(&m) == 0) {
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buffer_free(&m);
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return (NULL);
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}
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pw = buffer_get_string(&m, &pwlen);
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if (pwlen != sizeof(struct passwd))
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fatal("%s: struct passwd size mismatch", __func__);
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pw->pw_name = buffer_get_string(&m, NULL);
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pw->pw_passwd = buffer_get_string(&m, NULL);
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pw->pw_gecos = buffer_get_string(&m, NULL);
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#ifdef HAVE_PW_CLASS_IN_PASSWD
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pw->pw_class = buffer_get_string(&m, NULL);
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#endif
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pw->pw_dir = buffer_get_string(&m, NULL);
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pw->pw_shell = buffer_get_string(&m, NULL);
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buffer_free(&m);
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return (pw);
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}
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char* mm_auth2_read_banner(void)
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{
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Buffer m;
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char *banner;
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debug3("%s entering", __func__);
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buffer_init(&m);
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mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_AUTH2_READ_BANNER, &m);
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buffer_clear(&m);
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mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_AUTH2_READ_BANNER, &m);
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banner = buffer_get_string(&m, NULL);
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buffer_free(&m);
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return (banner);
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}
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/* Inform the privileged process about service and style */
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void
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mm_inform_authserv(char *service, char *style)
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{
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Buffer m;
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debug3("%s entering", __func__);
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buffer_init(&m);
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buffer_put_cstring(&m, service);
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buffer_put_cstring(&m, style ? style : "");
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mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_AUTHSERV, &m);
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buffer_free(&m);
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}
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/* Do the password authentication */
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int
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mm_auth_password(Authctxt *authctxt, char *password)
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{
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Buffer m;
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int authenticated = 0;
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debug3("%s entering", __func__);
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buffer_init(&m);
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buffer_put_cstring(&m, password);
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mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_AUTHPASSWORD, &m);
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debug3("%s: waiting for MONITOR_ANS_AUTHPASSWORD", __func__);
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mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_AUTHPASSWORD, &m);
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authenticated = buffer_get_int(&m);
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buffer_free(&m);
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debug3("%s: user %sauthenticated",
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__func__, authenticated ? "" : "not ");
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return (authenticated);
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}
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int
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mm_user_key_allowed(struct passwd *pw, Key *key)
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{
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return (mm_key_allowed(MM_USERKEY, NULL, NULL, key));
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}
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int
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mm_hostbased_key_allowed(struct passwd *pw, char *user, char *host,
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Key *key)
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{
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return (mm_key_allowed(MM_HOSTKEY, user, host, key));
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}
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int
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mm_auth_rhosts_rsa_key_allowed(struct passwd *pw, char *user,
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char *host, Key *key)
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{
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int ret;
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key->type = KEY_RSA; /* XXX hack for key_to_blob */
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ret = mm_key_allowed(MM_RSAHOSTKEY, user, host, key);
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key->type = KEY_RSA1;
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return (ret);
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}
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static void
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mm_send_debug(Buffer *m)
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{
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char *msg;
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while (buffer_len(m)) {
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msg = buffer_get_string(m, NULL);
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debug3("%s: Sending debug: %s", __func__, msg);
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packet_send_debug("%s", msg);
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xfree(msg);
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}
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}
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int
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mm_key_allowed(enum mm_keytype type, char *user, char *host, Key *key)
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{
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Buffer m;
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u_char *blob;
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u_int len;
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int allowed = 0;
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debug3("%s entering", __func__);
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/* Convert the key to a blob and the pass it over */
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if (!key_to_blob(key, &blob, &len))
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return (0);
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buffer_init(&m);
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buffer_put_int(&m, type);
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buffer_put_cstring(&m, user ? user : "");
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buffer_put_cstring(&m, host ? host : "");
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buffer_put_string(&m, blob, len);
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xfree(blob);
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mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_KEYALLOWED, &m);
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debug3("%s: waiting for MONITOR_ANS_KEYALLOWED", __func__);
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mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_KEYALLOWED, &m);
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allowed = buffer_get_int(&m);
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/* Send potential debug messages */
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mm_send_debug(&m);
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buffer_free(&m);
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return (allowed);
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}
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/*
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* This key verify needs to send the key type along, because the
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* privileged parent makes the decision if the key is allowed
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* for authentication.
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*/
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int
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mm_key_verify(Key *key, u_char *sig, u_int siglen, u_char *data, u_int datalen)
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{
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Buffer m;
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u_char *blob;
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u_int len;
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int verified = 0;
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debug3("%s entering", __func__);
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/* Convert the key to a blob and the pass it over */
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if (!key_to_blob(key, &blob, &len))
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return (0);
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buffer_init(&m);
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buffer_put_string(&m, blob, len);
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buffer_put_string(&m, sig, siglen);
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buffer_put_string(&m, data, datalen);
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xfree(blob);
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mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_KEYVERIFY, &m);
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debug3("%s: waiting for MONITOR_ANS_KEYVERIFY", __func__);
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mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_KEYVERIFY, &m);
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verified = buffer_get_int(&m);
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buffer_free(&m);
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return (verified);
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}
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/* Export key state after authentication */
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Newkeys *
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mm_newkeys_from_blob(u_char *blob, int blen)
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{
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Buffer b;
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u_int len;
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Newkeys *newkey = NULL;
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Enc *enc;
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Mac *mac;
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Comp *comp;
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debug3("%s: %p(%d)", __func__, blob, blen);
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#ifdef DEBUG_PK
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dump_base64(stderr, blob, blen);
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#endif
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buffer_init(&b);
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buffer_append(&b, blob, blen);
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newkey = xmalloc(sizeof(*newkey));
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enc = &newkey->enc;
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mac = &newkey->mac;
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comp = &newkey->comp;
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/* Enc structure */
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enc->name = buffer_get_string(&b, NULL);
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buffer_get(&b, &enc->cipher, sizeof(enc->cipher));
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enc->enabled = buffer_get_int(&b);
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enc->block_size = buffer_get_int(&b);
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enc->key = buffer_get_string(&b, &enc->key_len);
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enc->iv = buffer_get_string(&b, &len);
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if (len != enc->block_size)
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fatal("%s: bad ivlen: expected %d != %d", __func__,
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enc->block_size, len);
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if (enc->name == NULL || cipher_by_name(enc->name) != enc->cipher)
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fatal("%s: bad cipher name %s or pointer %p", __func__,
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enc->name, enc->cipher);
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/* Mac structure */
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mac->name = buffer_get_string(&b, NULL);
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if (mac->name == NULL || mac_init(mac, mac->name) == -1)
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fatal("%s: can not init mac %s", __func__, mac->name);
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mac->enabled = buffer_get_int(&b);
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mac->key = buffer_get_string(&b, &len);
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if (len > mac->key_len)
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fatal("%s: bad mac key length: %d > %d", __func__, len,
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mac->key_len);
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mac->key_len = len;
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/* Comp structure */
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comp->type = buffer_get_int(&b);
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comp->enabled = buffer_get_int(&b);
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comp->name = buffer_get_string(&b, NULL);
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len = buffer_len(&b);
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if (len != 0)
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error("newkeys_from_blob: remaining bytes in blob %d", len);
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buffer_free(&b);
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return (newkey);
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}
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int
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mm_newkeys_to_blob(int mode, u_char **blobp, u_int *lenp)
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{
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Buffer b;
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int len;
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u_char *buf;
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Enc *enc;
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Mac *mac;
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Comp *comp;
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Newkeys *newkey = newkeys[mode];
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debug3("%s: converting %p", __func__, newkey);
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if (newkey == NULL) {
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error("%s: newkey == NULL", __func__);
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return 0;
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}
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enc = &newkey->enc;
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mac = &newkey->mac;
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comp = &newkey->comp;
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buffer_init(&b);
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/* Enc structure */
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buffer_put_cstring(&b, enc->name);
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/* The cipher struct is constant and shared, you export pointer */
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buffer_append(&b, &enc->cipher, sizeof(enc->cipher));
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buffer_put_int(&b, enc->enabled);
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buffer_put_int(&b, enc->block_size);
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buffer_put_string(&b, enc->key, enc->key_len);
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packet_get_keyiv(mode, enc->iv, enc->block_size);
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buffer_put_string(&b, enc->iv, enc->block_size);
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/* Mac structure */
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buffer_put_cstring(&b, mac->name);
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buffer_put_int(&b, mac->enabled);
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buffer_put_string(&b, mac->key, mac->key_len);
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/* Comp structure */
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buffer_put_int(&b, comp->type);
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buffer_put_int(&b, comp->enabled);
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buffer_put_cstring(&b, comp->name);
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len = buffer_len(&b);
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buf = xmalloc(len);
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memcpy(buf, buffer_ptr(&b), len);
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memset(buffer_ptr(&b), 0, len);
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buffer_free(&b);
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if (lenp != NULL)
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*lenp = len;
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if (blobp != NULL)
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*blobp = buf;
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return len;
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}
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static void
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mm_send_kex(Buffer *m, Kex *kex)
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{
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buffer_put_string(m, kex->session_id, kex->session_id_len);
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buffer_put_int(m, kex->we_need);
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buffer_put_int(m, kex->hostkey_type);
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buffer_put_int(m, kex->kex_type);
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buffer_put_string(m, buffer_ptr(&kex->my), buffer_len(&kex->my));
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buffer_put_string(m, buffer_ptr(&kex->peer), buffer_len(&kex->peer));
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buffer_put_int(m, kex->flags);
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buffer_put_cstring(m, kex->client_version_string);
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buffer_put_cstring(m, kex->server_version_string);
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}
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|
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void
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mm_send_keystate(struct monitor *pmonitor)
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{
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Buffer m;
|
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u_char *blob, *p;
|
|
u_int bloblen, plen;
|
|
|
|
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);
|
|
memset(key, 0, keylen);
|
|
xfree(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_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",
|
|
__func__, newkeys[MODE_OUT], 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);
|
|
xfree(blob);
|
|
|
|
if (!mm_newkeys_to_blob(MODE_IN, &blob, &bloblen))
|
|
fatal("%s: conversion of newkeys failed", __func__);
|
|
|
|
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", __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);
|
|
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", __func__);
|
|
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", __func__);
|
|
|
|
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", __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);
|
|
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", __func__);
|
|
|
|
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", __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);
|
|
res = buffer_get_int(&m);
|
|
if (res == -1) {
|
|
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;
|
|
int len, res;
|
|
char *p, *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);
|
|
res = buffer_get_int(&m);
|
|
if (res == -1) {
|
|
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);
|
|
|
|
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", __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
|
|
|
|
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;
|
|
|
|
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);
|
|
|
|
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;
|
|
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", __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);
|
|
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", __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);
|
|
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);
|
|
}
|