/* $OpenBSD: monitor.c,v 1.115 2011/06/23 23:35:42 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/param.h>
#include <sys/socket.h>
#include "openbsd-compat/sys-tree.h"
#include <sys/wait.h>
#include <errno.h>
#include <fcntl.h>
#ifdef HAVE_PATHS_H
#include <paths.h>
#endif
#include <pwd.h>
#include <signal.h>
#include <stdarg.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#ifdef HAVE_POLL_H
#include <poll.h>
#else
# ifdef HAVE_SYS_POLL_H
# include <sys/poll.h>
# endif
#endif
#ifdef SKEY
#include <skey.h>
#endif
#include <openssl/dh.h>
#include "openbsd-compat/sys-queue.h"
#include "atomicio.h"
#include "xmalloc.h"
#include "ssh.h"
#include "key.h"
#include "buffer.h"
#include "hostfile.h"
#include "auth.h"
#include "cipher.h"
#include "kex.h"
#include "dh.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 "packet.h"
#include "auth-options.h"
#include "sshpty.h"
#include "channels.h"
#include "session.h"
#include "sshlogin.h"
#include "canohost.h"
#include "log.h"
#include "servconf.h"
#include "monitor.h"
#include "monitor_mm.h"
#ifdef GSSAPI
#include "ssh-gss.h"
#endif
#include "monitor_wrap.h"
#include "monitor_fdpass.h"
#include "misc.h"
#include "compat.h"
#include "ssh2.h"
#include "jpake.h"
#include "roaming.h"
#ifdef GSSAPI
static Gssctxt *gsscontext = NULL;
#endif
/* Imports */
extern ServerOptions options;
extern u_int utmp_len;
extern Newkeys *current_keys[];
extern z_stream incoming_stream;
extern z_stream outgoing_stream;
extern u_char session_id[];
extern Buffer auth_debug;
extern int auth_debug_init;
extern Buffer loginmsg;
/* State exported from the child */
struct {
z_stream incoming;
z_stream outgoing;
u_char *keyin;
u_int keyinlen;
u_char *keyout;
u_int keyoutlen;
u_char *ivin;
u_int ivinlen;
u_char *ivout;
u_int ivoutlen;
u_char *ssh1key;
u_int ssh1keylen;
int ssh1cipher;
int ssh1protoflags;
u_char *input;
u_int ilen;
u_char *output;
u_int olen;
u_int64_t sent_bytes;
u_int64_t recv_bytes;
} child_state;
/* Functions on the monitor that answer unprivileged requests */
int mm_answer_moduli(int, Buffer *);
int mm_answer_sign(int, Buffer *);
int mm_answer_pwnamallow(int, Buffer *);
int mm_answer_auth2_read_banner(int, Buffer *);
int mm_answer_authserv(int, Buffer *);
int mm_answer_authpassword(int, Buffer *);
int mm_answer_bsdauthquery(int, Buffer *);
int mm_answer_bsdauthrespond(int, Buffer *);
int mm_answer_skeyquery(int, Buffer *);
int mm_answer_skeyrespond(int, Buffer *);
int mm_answer_keyallowed(int, Buffer *);
int mm_answer_keyverify(int, Buffer *);
int mm_answer_pty(int, Buffer *);
int mm_answer_pty_cleanup(int, Buffer *);
int mm_answer_term(int, Buffer *);
int mm_answer_rsa_keyallowed(int, Buffer *);
int mm_answer_rsa_challenge(int, Buffer *);
int mm_answer_rsa_response(int, Buffer *);
int mm_answer_sesskey(int, Buffer *);
int mm_answer_sessid(int, Buffer *);
int mm_answer_jpake_get_pwdata(int, Buffer *);
int mm_answer_jpake_step1(int, Buffer *);
int mm_answer_jpake_step2(int, Buffer *);
int mm_answer_jpake_key_confirm(int, Buffer *);
int mm_answer_jpake_check_confirm(int, Buffer *);
#ifdef USE_PAM
int mm_answer_pam_start(int, Buffer *);
int mm_answer_pam_account(int, Buffer *);
int mm_answer_pam_init_ctx(int, Buffer *);
int mm_answer_pam_query(int, Buffer *);
int mm_answer_pam_respond(int, Buffer *);
int mm_answer_pam_free_ctx(int, Buffer *);
#endif
#ifdef GSSAPI
int mm_answer_gss_setup_ctx(int, Buffer *);
int mm_answer_gss_accept_ctx(int, Buffer *);
int mm_answer_gss_userok(int, Buffer *);
int mm_answer_gss_checkmic(int, Buffer *);
#endif
#ifdef SSH_AUDIT_EVENTS
int mm_answer_audit_event(int, Buffer *);
int mm_answer_audit_command(int, Buffer *);
#endif
static int monitor_read_log(struct monitor *);
static Authctxt *authctxt;
static BIGNUM *ssh1_challenge = NULL; /* used for ssh1 rsa auth */
/* local state for key verify */
static u_char *key_blob = NULL;
static u_int key_bloblen = 0;
static int key_blobtype = MM_NOKEY;
static char *hostbased_cuser = NULL;
static char *hostbased_chost = NULL;
static char *auth_method = "unknown";
static u_int session_id2_len = 0;
static u_char *session_id2 = NULL;
static pid_t monitor_child_pid;
struct mon_table {
enum monitor_reqtype type;
int flags;
int (*f)(int, Buffer *);
};
#define MON_ISAUTH 0x0004 /* Required for Authentication */
#define MON_AUTHDECIDE 0x0008 /* Decides Authentication */
#define MON_ONCE 0x0010 /* Disable after calling */
#define MON_ALOG 0x0020 /* Log auth attempt without authenticating */
#define MON_AUTH (MON_ISAUTH|MON_AUTHDECIDE)
#define MON_PERMIT 0x1000 /* Request is permitted */
struct mon_table mon_dispatch_proto20[] = {
{MONITOR_REQ_MODULI, MON_ONCE, mm_answer_moduli},
{MONITOR_REQ_SIGN, MON_ONCE, mm_answer_sign},
{MONITOR_REQ_PWNAM, MON_ONCE, mm_answer_pwnamallow},
{MONITOR_REQ_AUTHSERV, MON_ONCE, mm_answer_authserv},
{MONITOR_REQ_AUTH2_READ_BANNER, MON_ONCE, mm_answer_auth2_read_banner},
{MONITOR_REQ_AUTHPASSWORD, MON_AUTH, mm_answer_authpassword},
#ifdef USE_PAM
{MONITOR_REQ_PAM_START, MON_ONCE, mm_answer_pam_start},
{MONITOR_REQ_PAM_ACCOUNT, 0, mm_answer_pam_account},
{MONITOR_REQ_PAM_INIT_CTX, MON_ISAUTH, mm_answer_pam_init_ctx},
{MONITOR_REQ_PAM_QUERY, MON_ISAUTH, mm_answer_pam_query},
{MONITOR_REQ_PAM_RESPOND, MON_ISAUTH, mm_answer_pam_respond},
{MONITOR_REQ_PAM_FREE_CTX, MON_ONCE|MON_AUTHDECIDE, mm_answer_pam_free_ctx},
#endif
#ifdef SSH_AUDIT_EVENTS
{MONITOR_REQ_AUDIT_EVENT, MON_PERMIT, mm_answer_audit_event},
#endif
#ifdef BSD_AUTH
{MONITOR_REQ_BSDAUTHQUERY, MON_ISAUTH, mm_answer_bsdauthquery},
{MONITOR_REQ_BSDAUTHRESPOND, MON_AUTH, mm_answer_bsdauthrespond},
#endif
#ifdef SKEY
{MONITOR_REQ_SKEYQUERY, MON_ISAUTH, mm_answer_skeyquery},
{MONITOR_REQ_SKEYRESPOND, MON_AUTH, mm_answer_skeyrespond},
#endif
{MONITOR_REQ_KEYALLOWED, MON_ISAUTH, mm_answer_keyallowed},
{MONITOR_REQ_KEYVERIFY, MON_AUTH, mm_answer_keyverify},
#ifdef GSSAPI
{MONITOR_REQ_GSSSETUP, MON_ISAUTH, mm_answer_gss_setup_ctx},
{MONITOR_REQ_GSSSTEP, MON_ISAUTH, mm_answer_gss_accept_ctx},
{MONITOR_REQ_GSSUSEROK, MON_AUTH, mm_answer_gss_userok},
{MONITOR_REQ_GSSCHECKMIC, MON_ISAUTH, mm_answer_gss_checkmic},
#endif
#ifdef JPAKE
{MONITOR_REQ_JPAKE_GET_PWDATA, MON_ONCE, mm_answer_jpake_get_pwdata},
{MONITOR_REQ_JPAKE_STEP1, MON_ISAUTH, mm_answer_jpake_step1},
{MONITOR_REQ_JPAKE_STEP2, MON_ONCE, mm_answer_jpake_step2},
{MONITOR_REQ_JPAKE_KEY_CONFIRM, MON_ONCE, mm_answer_jpake_key_confirm},
{MONITOR_REQ_JPAKE_CHECK_CONFIRM, MON_AUTH, mm_answer_jpake_check_confirm},
#endif
{0, 0, NULL}
};
struct mon_table mon_dispatch_postauth20[] = {
{MONITOR_REQ_MODULI, 0, mm_answer_moduli},
{MONITOR_REQ_SIGN, 0, mm_answer_sign},
{MONITOR_REQ_PTY, 0, mm_answer_pty},
{MONITOR_REQ_PTYCLEANUP, 0, mm_answer_pty_cleanup},
{MONITOR_REQ_TERM, 0, mm_answer_term},
#ifdef SSH_AUDIT_EVENTS
{MONITOR_REQ_AUDIT_EVENT, MON_PERMIT, mm_answer_audit_event},
{MONITOR_REQ_AUDIT_COMMAND, MON_PERMIT, mm_answer_audit_command},
#endif
{0, 0, NULL}
};
struct mon_table mon_dispatch_proto15[] = {
{MONITOR_REQ_PWNAM, MON_ONCE, mm_answer_pwnamallow},
{MONITOR_REQ_SESSKEY, MON_ONCE, mm_answer_sesskey},
{MONITOR_REQ_SESSID, MON_ONCE, mm_answer_sessid},
{MONITOR_REQ_AUTHPASSWORD, MON_AUTH, mm_answer_authpassword},
{MONITOR_REQ_RSAKEYALLOWED, MON_ISAUTH|MON_ALOG, mm_answer_rsa_keyallowed},
{MONITOR_REQ_KEYALLOWED, MON_ISAUTH|MON_ALOG, mm_answer_keyallowed},
{MONITOR_REQ_RSACHALLENGE, MON_ONCE, mm_answer_rsa_challenge},
{MONITOR_REQ_RSARESPONSE, MON_ONCE|MON_AUTHDECIDE, mm_answer_rsa_response},
#ifdef BSD_AUTH
{MONITOR_REQ_BSDAUTHQUERY, MON_ISAUTH, mm_answer_bsdauthquery},
{MONITOR_REQ_BSDAUTHRESPOND, MON_AUTH, mm_answer_bsdauthrespond},
#endif
#ifdef SKEY
{MONITOR_REQ_SKEYQUERY, MON_ISAUTH, mm_answer_skeyquery},
{MONITOR_REQ_SKEYRESPOND, MON_AUTH, mm_answer_skeyrespond},
#endif
#ifdef USE_PAM
{MONITOR_REQ_PAM_START, MON_ONCE, mm_answer_pam_start},
{MONITOR_REQ_PAM_ACCOUNT, 0, mm_answer_pam_account},
{MONITOR_REQ_PAM_INIT_CTX, MON_ISAUTH, mm_answer_pam_init_ctx},
{MONITOR_REQ_PAM_QUERY, MON_ISAUTH, mm_answer_pam_query},
{MONITOR_REQ_PAM_RESPOND, MON_ISAUTH, mm_answer_pam_respond},
{MONITOR_REQ_PAM_FREE_CTX, MON_ONCE|MON_AUTHDECIDE, mm_answer_pam_free_ctx},
#endif
#ifdef SSH_AUDIT_EVENTS
{MONITOR_REQ_AUDIT_EVENT, MON_PERMIT, mm_answer_audit_event},
#endif
{0, 0, NULL}
};
struct mon_table mon_dispatch_postauth15[] = {
{MONITOR_REQ_PTY, MON_ONCE, mm_answer_pty},
{MONITOR_REQ_PTYCLEANUP, MON_ONCE, mm_answer_pty_cleanup},
{MONITOR_REQ_TERM, 0, mm_answer_term},
#ifdef SSH_AUDIT_EVENTS
{MONITOR_REQ_AUDIT_EVENT, MON_PERMIT, mm_answer_audit_event},
{MONITOR_REQ_AUDIT_COMMAND, MON_PERMIT|MON_ONCE, mm_answer_audit_command},
#endif
{0, 0, NULL}
};
struct mon_table *mon_dispatch;
/* Specifies if a certain message is allowed at the moment */
static void
monitor_permit(struct mon_table *ent, enum monitor_reqtype type, int permit)
{
while (ent->f != NULL) {
if (ent->type == type) {
ent->flags &= ~MON_PERMIT;
ent->flags |= permit ? MON_PERMIT : 0;
return;
}
ent++;
}
}
static void
monitor_permit_authentications(int permit)
{
struct mon_table *ent = mon_dispatch;
while (ent->f != NULL) {
if (ent->flags & MON_AUTH) {
ent->flags &= ~MON_PERMIT;
ent->flags |= permit ? MON_PERMIT : 0;
}
ent++;
}
}
void
monitor_child_preauth(Authctxt *_authctxt, struct monitor *pmonitor)
{
struct mon_table *ent;
int authenticated = 0;
debug3("preauth child monitor started");
close(pmonitor->m_recvfd);
close(pmonitor->m_log_sendfd);
pmonitor->m_log_sendfd = pmonitor->m_recvfd = -1;
authctxt = _authctxt;
memset(authctxt, 0, sizeof(*authctxt));
authctxt->loginmsg = &loginmsg;
if (compat20) {
mon_dispatch = mon_dispatch_proto20;
/* Permit requests for moduli and signatures */
monitor_permit(mon_dispatch, MONITOR_REQ_MODULI, 1);
monitor_permit(mon_dispatch, MONITOR_REQ_SIGN, 1);
} else {
mon_dispatch = mon_dispatch_proto15;
monitor_permit(mon_dispatch, MONITOR_REQ_SESSKEY, 1);
}
/* The first few requests do not require asynchronous access */
while (!authenticated) {
auth_method = "unknown";
authenticated = (monitor_read(pmonitor, mon_dispatch, &ent) == 1);
if (authenticated) {
if (!(ent->flags & MON_AUTHDECIDE))
fatal("%s: unexpected authentication from %d",
__func__, ent->type);
if (authctxt->pw->pw_uid == 0 &&
!auth_root_allowed(auth_method))
authenticated = 0;
#ifdef USE_PAM
/* PAM needs to perform account checks after auth */
if (options.use_pam && authenticated) {
Buffer m;
buffer_init(&m);
mm_request_receive_expect(pmonitor->m_sendfd,
MONITOR_REQ_PAM_ACCOUNT, &m);
authenticated = mm_answer_pam_account(pmonitor->m_sendfd, &m);
buffer_free(&m);
}
#endif
}
if (ent->flags & (MON_AUTHDECIDE|MON_ALOG)) {
auth_log(authctxt, authenticated, auth_method,
compat20 ? " ssh2" : "");
if (!authenticated)
authctxt->failures++;
}
#ifdef JPAKE
/* Cleanup JPAKE context after authentication */
if (ent->flags & MON_AUTHDECIDE) {
if (authctxt->jpake_ctx != NULL) {
jpake_free(authctxt->jpake_ctx);
authctxt->jpake_ctx = NULL;
}
}
#endif
}
/* Drain any buffered messages from the child */
while (pmonitor->m_log_recvfd != -1 && monitor_read_log(pmonitor) == 0)
;
if (!authctxt->valid)
fatal("%s: authenticated invalid user", __func__);
if (strcmp(auth_method, "unknown") == 0)
fatal("%s: authentication method name unknown", __func__);
debug("%s: %s has been authenticated by privileged process",
__func__, authctxt->user);
mm_get_keystate(pmonitor);
close(pmonitor->m_sendfd);
close(pmonitor->m_log_recvfd);
pmonitor->m_sendfd = pmonitor->m_log_recvfd = -1;
}
static void
monitor_set_child_handler(pid_t pid)
{
monitor_child_pid = pid;
}
static void
monitor_child_handler(int sig)
{
kill(monitor_child_pid, sig);
}
void
monitor_child_postauth(struct monitor *pmonitor)
{
close(pmonitor->m_recvfd);
pmonitor->m_recvfd = -1;
monitor_set_child_handler(pmonitor->m_pid);
signal(SIGHUP, &monitor_child_handler);
signal(SIGTERM, &monitor_child_handler);
signal(SIGINT, &monitor_child_handler);
if (compat20) {
mon_dispatch = mon_dispatch_postauth20;
/* Permit requests for moduli and signatures */
monitor_permit(mon_dispatch, MONITOR_REQ_MODULI, 1);
monitor_permit(mon_dispatch, MONITOR_REQ_SIGN, 1);
monitor_permit(mon_dispatch, MONITOR_REQ_TERM, 1);
} else {
mon_dispatch = mon_dispatch_postauth15;
monitor_permit(mon_dispatch, MONITOR_REQ_TERM, 1);
}
if (!no_pty_flag) {
monitor_permit(mon_dispatch, MONITOR_REQ_PTY, 1);
monitor_permit(mon_dispatch, MONITOR_REQ_PTYCLEANUP, 1);
}
for (;;)
monitor_read(pmonitor, mon_dispatch, NULL);
close(pmonitor->m_sendfd);
pmonitor->m_sendfd = -1;
}
void
monitor_sync(struct monitor *pmonitor)
{
if (options.compression) {
/* The member allocation is not visible, so sync it */
mm_share_sync(&pmonitor->m_zlib, &pmonitor->m_zback);
}
}
static int
monitor_read_log(struct monitor *pmonitor)
{
Buffer logmsg;
u_int len, level;
char *msg;
buffer_init(&logmsg);
/* Read length */
buffer_append_space(&logmsg, 4);
if (atomicio(read, pmonitor->m_log_recvfd,
buffer_ptr(&logmsg), buffer_len(&logmsg)) != buffer_len(&logmsg)) {
if (errno == EPIPE) {
debug("%s: child log fd closed", __func__);
close(pmonitor->m_log_recvfd);
pmonitor->m_log_recvfd = -1;
return -1;
}
fatal("%s: log fd read: %s", __func__, strerror(errno));
}
len = buffer_get_int(&logmsg);
if (len <= 4 || len > 8192)
fatal("%s: invalid log message length %u", __func__, len);
/* Read severity, message */
buffer_clear(&logmsg);
buffer_append_space(&logmsg, len);
if (atomicio(read, pmonitor->m_log_recvfd,
buffer_ptr(&logmsg), buffer_len(&logmsg)) != buffer_len(&logmsg))
fatal("%s: log fd read: %s", __func__, strerror(errno));
/* Log it */
level = buffer_get_int(&logmsg);
msg = buffer_get_string(&logmsg, NULL);
if (log_level_name(level) == NULL)
fatal("%s: invalid log level %u (corrupted message?)",
__func__, level);
do_log2(level, "%s [preauth]", msg);
buffer_free(&logmsg);
xfree(msg);
return 0;
}
int
monitor_read(struct monitor *pmonitor, struct mon_table *ent,
struct mon_table **pent)
{
Buffer m;
int ret;
u_char type;
struct pollfd pfd[2];
for (;;) {
bzero(&pfd, sizeof(pfd));
pfd[0].fd = pmonitor->m_sendfd;
pfd[0].events = POLLIN;
pfd[1].fd = pmonitor->m_log_recvfd;
pfd[1].events = pfd[1].fd == -1 ? 0 : POLLIN;
if (poll(pfd, pfd[1].fd == -1 ? 1 : 2, -1) == -1) {
if (errno == EINTR || errno == EAGAIN)
continue;
fatal("%s: poll: %s", __func__, strerror(errno));
}
if (pfd[1].revents) {
/*
* Drain all log messages before processing next
* monitor request.
*/
monitor_read_log(pmonitor);
continue;
}
if (pfd[0].revents)
break; /* Continues below */
}
buffer_init(&m);
mm_request_receive(pmonitor->m_sendfd, &m);
type = buffer_get_char(&m);
debug3("%s: checking request %d", __func__, type);
while (ent->f != NULL) {
if (ent->type == type)
break;
ent++;
}
if (ent->f != NULL) {
if (!(ent->flags & MON_PERMIT))
fatal("%s: unpermitted request %d", __func__,
type);
ret = (*ent->f)(pmonitor->m_sendfd, &m);
buffer_free(&m);
/* The child may use this request only once, disable it */
if (ent->flags & MON_ONCE) {
debug2("%s: %d used once, disabling now", __func__,
type);
ent->flags &= ~MON_PERMIT;
}
if (pent != NULL)
*pent = ent;
return ret;
}
fatal("%s: unsupported request: %d", __func__, type);
/* NOTREACHED */
return (-1);
}
/* allowed key state */
static int
monitor_allowed_key(u_char *blob, u_int bloblen)
{
/* make sure key is allowed */
if (key_blob == NULL || key_bloblen != bloblen ||
timingsafe_bcmp(key_blob, blob, key_bloblen))
return (0);
return (1);
}
static void
monitor_reset_key_state(void)
{
/* reset state */
if (key_blob != NULL)
xfree(key_blob);
if (hostbased_cuser != NULL)
xfree(hostbased_cuser);
if (hostbased_chost != NULL)
xfree(hostbased_chost);
key_blob = NULL;
key_bloblen = 0;
key_blobtype = MM_NOKEY;
hostbased_cuser = NULL;
hostbased_chost = NULL;
}
int
mm_answer_moduli(int sock, Buffer *m)
{
DH *dh;
int min, want, max;
min = buffer_get_int(m);
want = buffer_get_int(m);
max = buffer_get_int(m);
debug3("%s: got parameters: %d %d %d",
__func__, min, want, max);
/* We need to check here, too, in case the child got corrupted */
if (max < min || want < min || max < want)
fatal("%s: bad parameters: %d %d %d",
__func__, min, want, max);
buffer_clear(m);
dh = choose_dh(min, want, max);
if (dh == NULL) {
buffer_put_char(m, 0);
return (0);
} else {
/* Send first bignum */
buffer_put_char(m, 1);
buffer_put_bignum2(m, dh->p);
buffer_put_bignum2(m, dh->g);
DH_free(dh);
}
mm_request_send(sock, MONITOR_ANS_MODULI, m);
return (0);
}
int
mm_answer_sign(int sock, Buffer *m)
{
Key *key;
u_char *p;
u_char *signature;
u_int siglen, datlen;
int keyid;
debug3("%s", __func__);
keyid = buffer_get_int(m);
p = buffer_get_string(m, &datlen);
/*
* Supported KEX types use SHA1 (20 bytes), SHA256 (32 bytes),
* SHA384 (48 bytes) and SHA512 (64 bytes).
*/
if (datlen != 20 && datlen != 32 && datlen != 48 && datlen != 64)
fatal("%s: data length incorrect: %u", __func__, datlen);
/* save session id, it will be passed on the first call */
if (session_id2_len == 0) {
session_id2_len = datlen;
session_id2 = xmalloc(session_id2_len);
memcpy(session_id2, p, session_id2_len);
}
if ((key = get_hostkey_by_index(keyid)) == NULL)
fatal("%s: no hostkey from index %d", __func__, keyid);
if (key_sign(key, &signature, &siglen, p, datlen) < 0)
fatal("%s: key_sign failed", __func__);
debug3("%s: signature %p(%u)", __func__, signature, siglen);
buffer_clear(m);
buffer_put_string(m, signature, siglen);
xfree(p);
xfree(signature);
mm_request_send(sock, MONITOR_ANS_SIGN, m);
/* Turn on permissions for getpwnam */
monitor_permit(mon_dispatch, MONITOR_REQ_PWNAM, 1);
return (0);
}
/* Retrieves the password entry and also checks if the user is permitted */
int
mm_answer_pwnamallow(int sock, Buffer *m)
{
char *username;
struct passwd *pwent;
int allowed = 0;
u_int i;
debug3("%s", __func__);
if (authctxt->attempt++ != 0)
fatal("%s: multiple attempts for getpwnam", __func__);
username = buffer_get_string(m, NULL);
pwent = getpwnamallow(username);
authctxt->user = xstrdup(username);
setproctitle("%s [priv]", pwent ? username : "unknown");
xfree(username);
buffer_clear(m);
if (pwent == NULL) {
buffer_put_char(m, 0);
authctxt->pw = fakepw();
goto out;
}
allowed = 1;
authctxt->pw = pwent;
authctxt->valid = 1;
buffer_put_char(m, 1);
buffer_put_string(m, pwent, sizeof(struct passwd));
buffer_put_cstring(m, pwent->pw_name);
buffer_put_cstring(m, "*");
#ifdef HAVE_PW_GECOS_IN_PASSWD
buffer_put_cstring(m, pwent->pw_gecos);
#endif
#ifdef HAVE_PW_CLASS_IN_PASSWD
buffer_put_cstring(m, pwent->pw_class);
#endif
buffer_put_cstring(m, pwent->pw_dir);
buffer_put_cstring(m, pwent->pw_shell);
out:
buffer_put_string(m, &options, sizeof(options));
#define M_CP_STROPT(x) do { \
if (options.x != NULL) \
buffer_put_cstring(m, options.x); \
} while (0)
#define M_CP_STRARRAYOPT(x, nx) do { \
for (i = 0; i < options.nx; i++) \
buffer_put_cstring(m, options.x[i]); \
} while (0)
/* See comment in servconf.h */
COPY_MATCH_STRING_OPTS();
#undef M_CP_STROPT
#undef M_CP_STRARRAYOPT
debug3("%s: sending MONITOR_ANS_PWNAM: %d", __func__, allowed);
mm_request_send(sock, MONITOR_ANS_PWNAM, m);
/* For SSHv1 allow authentication now */
if (!compat20)
monitor_permit_authentications(1);
else {
/* Allow service/style information on the auth context */
monitor_permit(mon_dispatch, MONITOR_REQ_AUTHSERV, 1);
monitor_permit(mon_dispatch, MONITOR_REQ_AUTH2_READ_BANNER, 1);
}
#ifdef USE_PAM
if (options.use_pam)
monitor_permit(mon_dispatch, MONITOR_REQ_PAM_START, 1);
#endif
return (0);
}
int mm_answer_auth2_read_banner(int sock, Buffer *m)
{
char *banner;
buffer_clear(m);
banner = auth2_read_banner();
buffer_put_cstring(m, banner != NULL ? banner : "");
mm_request_send(sock, MONITOR_ANS_AUTH2_READ_BANNER, m);
if (banner != NULL)
xfree(banner);
return (0);
}
int
mm_answer_authserv(int sock, Buffer *m)
{
monitor_permit_authentications(1);
authctxt->service = buffer_get_string(m, NULL);
authctxt->style = buffer_get_string(m, NULL);
debug3("%s: service=%s, style=%s",
__func__, authctxt->service, authctxt->style);
if (strlen(authctxt->style) == 0) {
xfree(authctxt->style);
authctxt->style = NULL;
}
return (0);
}
int
mm_answer_authpassword(int sock, Buffer *m)
{
static int call_count;
char *passwd;
int authenticated;
u_int plen;
passwd = buffer_get_string(m, &plen);
/* Only authenticate if the context is valid */
#ifndef ANDROID
/* no password authentication in android */
authenticated = options.password_authentication &&
auth_password(authctxt, passwd);
#else
authenticated = 0;
#endif
memset(passwd, 0, strlen(passwd));
xfree(passwd);
buffer_clear(m);
buffer_put_int(m, authenticated);
debug3("%s: sending result %d", __func__, authenticated);
mm_request_send(sock, MONITOR_ANS_AUTHPASSWORD, m);
call_count++;
if (plen == 0 && call_count == 1)
auth_method = "none";
else
auth_method = "password";
/* Causes monitor loop to terminate if authenticated */
return (authenticated);
}
#ifdef BSD_AUTH
int
mm_answer_bsdauthquery(int sock, Buffer *m)
{
char *name, *infotxt;
u_int numprompts;
u_int *echo_on;
char **prompts;
u_int success;
success = bsdauth_query(authctxt, &name, &infotxt, &numprompts,
&prompts, &echo_on) < 0 ? 0 : 1;
buffer_clear(m);
buffer_put_int(m, success);
if (success)
buffer_put_cstring(m, prompts[0]);
debug3("%s: sending challenge success: %u", __func__, success);
mm_request_send(sock, MONITOR_ANS_BSDAUTHQUERY, m);
if (success) {
xfree(name);
xfree(infotxt);
xfree(prompts);
xfree(echo_on);
}
return (0);
}
int
mm_answer_bsdauthrespond(int sock, Buffer *m)
{
char *response;
int authok;
if (authctxt->as == 0)
fatal("%s: no bsd auth session", __func__);
response = buffer_get_string(m, NULL);
authok = options.challenge_response_authentication &&
auth_userresponse(authctxt->as, response, 0);
authctxt->as = NULL;
debug3("%s: <%s> = <%d>", __func__, response, authok);
xfree(response);
buffer_clear(m);
buffer_put_int(m, authok);
debug3("%s: sending authenticated: %d", __func__, authok);
mm_request_send(sock, MONITOR_ANS_BSDAUTHRESPOND, m);
auth_method = "bsdauth";
return (authok != 0);
}
#endif
#ifdef SKEY
int
mm_answer_skeyquery(int sock, Buffer *m)
{
struct skey skey;
char challenge[1024];
u_int success;
success = _compat_skeychallenge(&skey, authctxt->user, challenge,
sizeof(challenge)) < 0 ? 0 : 1;
buffer_clear(m);
buffer_put_int(m, success);
if (success)
buffer_put_cstring(m, challenge);
debug3("%s: sending challenge success: %u", __func__, success);
mm_request_send(sock, MONITOR_ANS_SKEYQUERY, m);
return (0);
}
int
mm_answer_skeyrespond(int sock, Buffer *m)
{
char *response;
int authok;
response = buffer_get_string(m, NULL);
authok = (options.challenge_response_authentication &&
authctxt->valid &&
skey_haskey(authctxt->pw->pw_name) == 0 &&
skey_passcheck(authctxt->pw->pw_name, response) != -1);
xfree(response);
buffer_clear(m);
buffer_put_int(m, authok);
debug3("%s: sending authenticated: %d", __func__, authok);
mm_request_send(sock, MONITOR_ANS_SKEYRESPOND, m);
auth_method = "skey";
return (authok != 0);
}
#endif
#ifdef USE_PAM
int
mm_answer_pam_start(int sock, Buffer *m)
{
if (!options.use_pam)
fatal("UsePAM not set, but ended up in %s anyway", __func__);
start_pam(authctxt);
monitor_permit(mon_dispatch, MONITOR_REQ_PAM_ACCOUNT, 1);
return (0);
}
int
mm_answer_pam_account(int sock, Buffer *m)
{
u_int ret;
if (!options.use_pam)
fatal("UsePAM not set, but ended up in %s anyway", __func__);
ret = do_pam_account();
buffer_put_int(m, ret);
buffer_put_string(m, buffer_ptr(&loginmsg), buffer_len(&loginmsg));
mm_request_send(sock, MONITOR_ANS_PAM_ACCOUNT, m);
return (ret);
}
static void *sshpam_ctxt, *sshpam_authok;
extern KbdintDevice sshpam_device;
int
mm_answer_pam_init_ctx(int sock, Buffer *m)
{
debug3("%s", __func__);
authctxt->user = buffer_get_string(m, NULL);
sshpam_ctxt = (sshpam_device.init_ctx)(authctxt);
sshpam_authok = NULL;
buffer_clear(m);
if (sshpam_ctxt != NULL) {
monitor_permit(mon_dispatch, MONITOR_REQ_PAM_FREE_CTX, 1);
buffer_put_int(m, 1);
} else {
buffer_put_int(m, 0);
}
mm_request_send(sock, MONITOR_ANS_PAM_INIT_CTX, m);
return (0);
}
int
mm_answer_pam_query(int sock, Buffer *m)
{
char *name = NULL, *info = NULL, **prompts = NULL;
u_int i, num = 0, *echo_on = 0;
int ret;
debug3("%s", __func__);
sshpam_authok = NULL;
ret = (sshpam_device.query)(sshpam_ctxt, &name, &info, &num, &prompts, &echo_on);
if (ret == 0 && num == 0)
sshpam_authok = sshpam_ctxt;
if (num > 1 || name == NULL || info == NULL)
ret = -1;
buffer_clear(m);
buffer_put_int(m, ret);
buffer_put_cstring(m, name);
xfree(name);
buffer_put_cstring(m, info);
xfree(info);
buffer_put_int(m, num);
for (i = 0; i < num; ++i) {
buffer_put_cstring(m, prompts[i]);
xfree(prompts[i]);
buffer_put_int(m, echo_on[i]);
}
if (prompts != NULL)
xfree(prompts);
if (echo_on != NULL)
xfree(echo_on);
auth_method = "keyboard-interactive/pam";
mm_request_send(sock, MONITOR_ANS_PAM_QUERY, m);
return (0);
}
int
mm_answer_pam_respond(int sock, Buffer *m)
{
char **resp;
u_int i, num;
int ret;
debug3("%s", __func__);
sshpam_authok = NULL;
num = buffer_get_int(m);
if (num > 0) {
resp = xcalloc(num, sizeof(char *));
for (i = 0; i < num; ++i)
resp[i] = buffer_get_string(m, NULL);
ret = (sshpam_device.respond)(sshpam_ctxt, num, resp);
for (i = 0; i < num; ++i)
xfree(resp[i]);
xfree(resp);
} else {
ret = (sshpam_device.respond)(sshpam_ctxt, num, NULL);
}
buffer_clear(m);
buffer_put_int(m, ret);
mm_request_send(sock, MONITOR_ANS_PAM_RESPOND, m);
auth_method = "keyboard-interactive/pam";
if (ret == 0)
sshpam_authok = sshpam_ctxt;
return (0);
}
int
mm_answer_pam_free_ctx(int sock, Buffer *m)
{
debug3("%s", __func__);
(sshpam_device.free_ctx)(sshpam_ctxt);
buffer_clear(m);
mm_request_send(sock, MONITOR_ANS_PAM_FREE_CTX, m);
auth_method = "keyboard-interactive/pam";
return (sshpam_authok == sshpam_ctxt);
}
#endif
int
mm_answer_keyallowed(int sock, Buffer *m)
{
Key *key;
char *cuser, *chost;
u_char *blob;
u_int bloblen;
enum mm_keytype type = 0;
int allowed = 0;
debug3("%s entering", __func__);
type = buffer_get_int(m);
cuser = buffer_get_string(m, NULL);
chost = buffer_get_string(m, NULL);
blob = buffer_get_string(m, &bloblen);
key = key_from_blob(blob, bloblen);
if ((compat20 && type == MM_RSAHOSTKEY) ||
(!compat20 && type != MM_RSAHOSTKEY))
fatal("%s: key type and protocol mismatch", __func__);
debug3("%s: key_from_blob: %p", __func__, key);
if (key != NULL && authctxt->valid) {
switch (type) {
case MM_USERKEY:
allowed = options.pubkey_authentication &&
user_key_allowed(authctxt->pw, key);
auth_method = "publickey";
if (options.pubkey_authentication && allowed != 1)
auth_clear_options();
break;
case MM_HOSTKEY:
allowed = options.hostbased_authentication &&
hostbased_key_allowed(authctxt->pw,
cuser, chost, key);
auth_method = "hostbased";
break;
case MM_RSAHOSTKEY:
key->type = KEY_RSA1; /* XXX */
allowed = options.rhosts_rsa_authentication &&
auth_rhosts_rsa_key_allowed(authctxt->pw,
cuser, chost, key);
if (options.rhosts_rsa_authentication && allowed != 1)
auth_clear_options();
auth_method = "rsa";
break;
default:
fatal("%s: unknown key type %d", __func__, type);
break;
}
}
if (key != NULL)
key_free(key);
/* clear temporarily storage (used by verify) */
monitor_reset_key_state();
if (allowed) {
/* Save temporarily for comparison in verify */
key_blob = blob;
key_bloblen = bloblen;
key_blobtype = type;
hostbased_cuser = cuser;
hostbased_chost = chost;
} else {
/* Log failed attempt */
auth_log(authctxt, 0, auth_method, compat20 ? " ssh2" : "");
xfree(blob);
xfree(cuser);
xfree(chost);
}
debug3("%s: key %p is %s",
__func__, key, allowed ? "allowed" : "not allowed");
buffer_clear(m);
buffer_put_int(m, allowed);
buffer_put_int(m, forced_command != NULL);
mm_request_send(sock, MONITOR_ANS_KEYALLOWED, m);
if (type == MM_RSAHOSTKEY)
monitor_permit(mon_dispatch, MONITOR_REQ_RSACHALLENGE, allowed);
return (0);
}
static int
monitor_valid_userblob(u_char *data, u_int datalen)
{
Buffer b;
char *p;
u_int len;
int fail = 0;
buffer_init(&b);
buffer_append(&b, data, datalen);
if (datafellows & SSH_OLD_SESSIONID) {
p = buffer_ptr(&b);
len = buffer_len(&b);
if ((session_id2 == NULL) ||
(len < session_id2_len) ||
(timingsafe_bcmp(p, session_id2, session_id2_len) != 0))
fail++;
buffer_consume(&b, session_id2_len);
} else {
p = buffer_get_string(&b, &len);
if ((session_id2 == NULL) ||
(len != session_id2_len) ||
(timingsafe_bcmp(p, session_id2, session_id2_len) != 0))
fail++;
xfree(p);
}
if (buffer_get_char(&b) != SSH2_MSG_USERAUTH_REQUEST)
fail++;
p = buffer_get_string(&b, NULL);
if (strcmp(authctxt->user, p) != 0) {
logit("wrong user name passed to monitor: expected %s != %.100s",
authctxt->user, p);
fail++;
}
xfree(p);
buffer_skip_string(&b);
if (datafellows & SSH_BUG_PKAUTH) {
if (!buffer_get_char(&b))
fail++;
} else {
p = buffer_get_string(&b, NULL);
if (strcmp("publickey", p) != 0)
fail++;
xfree(p);
if (!buffer_get_char(&b))
fail++;
buffer_skip_string(&b);
}
buffer_skip_string(&b);
if (buffer_len(&b) != 0)
fail++;
buffer_free(&b);
return (fail == 0);
}
static int
monitor_valid_hostbasedblob(u_char *data, u_int datalen, char *cuser,
char *chost)
{
Buffer b;
char *p;
u_int len;
int fail = 0;
buffer_init(&b);
buffer_append(&b, data, datalen);
p = buffer_get_string(&b, &len);
if ((session_id2 == NULL) ||
(len != session_id2_len) ||
(timingsafe_bcmp(p, session_id2, session_id2_len) != 0))
fail++;
xfree(p);
if (buffer_get_char(&b) != SSH2_MSG_USERAUTH_REQUEST)
fail++;
p = buffer_get_string(&b, NULL);
if (strcmp(authctxt->user, p) != 0) {
logit("wrong user name passed to monitor: expected %s != %.100s",
authctxt->user, p);
fail++;
}
xfree(p);
buffer_skip_string(&b); /* service */
p = buffer_get_string(&b, NULL);
if (strcmp(p, "hostbased") != 0)
fail++;
xfree(p);
buffer_skip_string(&b); /* pkalg */
buffer_skip_string(&b); /* pkblob */
/* verify client host, strip trailing dot if necessary */
p = buffer_get_string(&b, NULL);
if (((len = strlen(p)) > 0) && p[len - 1] == '.')
p[len - 1] = '\0';
if (strcmp(p, chost) != 0)
fail++;
xfree(p);
/* verify client user */
p = buffer_get_string(&b, NULL);
if (strcmp(p, cuser) != 0)
fail++;
xfree(p);
if (buffer_len(&b) != 0)
fail++;
buffer_free(&b);
return (fail == 0);
}
int
mm_answer_keyverify(int sock, Buffer *m)
{
Key *key;
u_char *signature, *data, *blob;
u_int signaturelen, datalen, bloblen;
int verified = 0;
int valid_data = 0;
blob = buffer_get_string(m, &bloblen);
signature = buffer_get_string(m, &signaturelen);
data = buffer_get_string(m, &datalen);
if (hostbased_cuser == NULL || hostbased_chost == NULL ||
!monitor_allowed_key(blob, bloblen))
fatal("%s: bad key, not previously allowed", __func__);
key = key_from_blob(blob, bloblen);
if (key == NULL)
fatal("%s: bad public key blob", __func__);
switch (key_blobtype) {
case MM_USERKEY:
valid_data = monitor_valid_userblob(data, datalen);
break;
case MM_HOSTKEY:
valid_data = monitor_valid_hostbasedblob(data, datalen,
hostbased_cuser, hostbased_chost);
break;
default:
valid_data = 0;
break;
}
if (!valid_data)
fatal("%s: bad signature data blob", __func__);
verified = key_verify(key, signature, signaturelen, data, datalen);
debug3("%s: key %p signature %s",
__func__, key, (verified == 1) ? "verified" : "unverified");
key_free(key);
xfree(blob);
xfree(signature);
xfree(data);
auth_method = key_blobtype == MM_USERKEY ? "publickey" : "hostbased";
monitor_reset_key_state();
buffer_clear(m);
buffer_put_int(m, verified);
mm_request_send(sock, MONITOR_ANS_KEYVERIFY, m);
return (verified == 1);
}
static void
mm_record_login(Session *s, struct passwd *pw)
{
socklen_t fromlen;
struct sockaddr_storage from;
/*
* Get IP address of client. If the connection is not a socket, let
* the address be 0.0.0.0.
*/
memset(&from, 0, sizeof(from));
fromlen = sizeof(from);
if (packet_connection_is_on_socket()) {
if (getpeername(packet_get_connection_in(),
(struct sockaddr *)&from, &fromlen) < 0) {
debug("getpeername: %.100s", strerror(errno));
cleanup_exit(255);
}
}
/* Record that there was a login on that tty from the remote host. */
record_login(s->pid, s->tty, pw->pw_name, pw->pw_uid,
get_remote_name_or_ip(utmp_len, options.use_dns),
(struct sockaddr *)&from, fromlen);
}
static void
mm_session_close(Session *s)
{
debug3("%s: session %d pid %ld", __func__, s->self, (long)s->pid);
if (s->ttyfd != -1) {
debug3("%s: tty %s ptyfd %d", __func__, s->tty, s->ptyfd);
session_pty_cleanup2(s);
}
session_unused(s->self);
}
int
mm_answer_pty(int sock, Buffer *m)
{
extern struct monitor *pmonitor;
Session *s;
int res, fd0;
debug3("%s entering", __func__);
buffer_clear(m);
s = session_new();
if (s == NULL)
goto error;
s->authctxt = authctxt;
s->pw = authctxt->pw;
s->pid = pmonitor->m_pid;
res = pty_allocate(&s->ptyfd, &s->ttyfd, s->tty, sizeof(s->tty));
if (res == 0)
goto error;
pty_setowner(authctxt->pw, s->tty);
buffer_put_int(m, 1);
buffer_put_cstring(m, s->tty);
/* We need to trick ttyslot */
if (dup2(s->ttyfd, 0) == -1)
fatal("%s: dup2", __func__);
mm_record_login(s, authctxt->pw);
/* Now we can close the file descriptor again */
close(0);
/* send messages generated by record_login */
buffer_put_string(m, buffer_ptr(&loginmsg), buffer_len(&loginmsg));
buffer_clear(&loginmsg);
mm_request_send(sock, MONITOR_ANS_PTY, m);
if (mm_send_fd(sock, s->ptyfd) == -1 ||
mm_send_fd(sock, s->ttyfd) == -1)
fatal("%s: send fds failed", __func__);
/* make sure nothing uses fd 0 */
if ((fd0 = open(_PATH_DEVNULL, O_RDONLY)) < 0)
fatal("%s: open(/dev/null): %s", __func__, strerror(errno));
if (fd0 != 0)
error("%s: fd0 %d != 0", __func__, fd0);
/* slave is not needed */
close(s->ttyfd);
s->ttyfd = s->ptyfd;
/* no need to dup() because nobody closes ptyfd */
s->ptymaster = s->ptyfd;
debug3("%s: tty %s ptyfd %d", __func__, s->tty, s->ttyfd);
return (0);
error:
if (s != NULL)
mm_session_close(s);
buffer_put_int(m, 0);
mm_request_send(sock, MONITOR_ANS_PTY, m);
return (0);
}
int
mm_answer_pty_cleanup(int sock, Buffer *m)
{
Session *s;
char *tty;
debug3("%s entering", __func__);
tty = buffer_get_string(m, NULL);
if ((s = session_by_tty(tty)) != NULL)
mm_session_close(s);
buffer_clear(m);
xfree(tty);
return (0);
}
int
mm_answer_sesskey(int sock, Buffer *m)
{
BIGNUM *p;
int rsafail;
/* Turn off permissions */
monitor_permit(mon_dispatch, MONITOR_REQ_SESSKEY, 0);
if ((p = BN_new()) == NULL)
fatal("%s: BN_new", __func__);
buffer_get_bignum2(m, p);
rsafail = ssh1_session_key(p);
buffer_clear(m);
buffer_put_int(m, rsafail);
buffer_put_bignum2(m, p);
BN_clear_free(p);
mm_request_send(sock, MONITOR_ANS_SESSKEY, m);
/* Turn on permissions for sessid passing */
monitor_permit(mon_dispatch, MONITOR_REQ_SESSID, 1);
return (0);
}
int
mm_answer_sessid(int sock, Buffer *m)
{
int i;
debug3("%s entering", __func__);
if (buffer_len(m) != 16)
fatal("%s: bad ssh1 session id", __func__);
for (i = 0; i < 16; i++)
session_id[i] = buffer_get_char(m);
/* Turn on permissions for getpwnam */
monitor_permit(mon_dispatch, MONITOR_REQ_PWNAM, 1);
return (0);
}
int
mm_answer_rsa_keyallowed(int sock, Buffer *m)
{
BIGNUM *client_n;
Key *key = NULL;
u_char *blob = NULL;
u_int blen = 0;
int allowed = 0;
debug3("%s entering", __func__);
auth_method = "rsa";
if (options.rsa_authentication && authctxt->valid) {
if ((client_n = BN_new()) == NULL)
fatal("%s: BN_new", __func__);
buffer_get_bignum2(m, client_n);
allowed = auth_rsa_key_allowed(authctxt->pw, client_n, &key);
BN_clear_free(client_n);
}
buffer_clear(m);
buffer_put_int(m, allowed);
buffer_put_int(m, forced_command != NULL);
/* clear temporarily storage (used by generate challenge) */
monitor_reset_key_state();
if (allowed && key != NULL) {
key->type = KEY_RSA; /* cheat for key_to_blob */
if (key_to_blob(key, &blob, &blen) == 0)
fatal("%s: key_to_blob failed", __func__);
buffer_put_string(m, blob, blen);
/* Save temporarily for comparison in verify */
key_blob = blob;
key_bloblen = blen;
key_blobtype = MM_RSAUSERKEY;
}
if (key != NULL)
key_free(key);
mm_request_send(sock, MONITOR_ANS_RSAKEYALLOWED, m);
monitor_permit(mon_dispatch, MONITOR_REQ_RSACHALLENGE, allowed);
monitor_permit(mon_dispatch, MONITOR_REQ_RSARESPONSE, 0);
return (0);
}
int
mm_answer_rsa_challenge(int sock, Buffer *m)
{
Key *key = NULL;
u_char *blob;
u_int blen;
debug3("%s entering", __func__);
if (!authctxt->valid)
fatal("%s: authctxt not valid", __func__);
blob = buffer_get_string(m, &blen);
if (!monitor_allowed_key(blob, blen))
fatal("%s: bad key, not previously allowed", __func__);
if (key_blobtype != MM_RSAUSERKEY && key_blobtype != MM_RSAHOSTKEY)
fatal("%s: key type mismatch", __func__);
if ((key = key_from_blob(blob, blen)) == NULL)
fatal("%s: received bad key", __func__);
if (key->type != KEY_RSA)
fatal("%s: received bad key type %d", __func__, key->type);
key->type = KEY_RSA1;
if (ssh1_challenge)
BN_clear_free(ssh1_challenge);
ssh1_challenge = auth_rsa_generate_challenge(key);
buffer_clear(m);
buffer_put_bignum2(m, ssh1_challenge);
debug3("%s sending reply", __func__);
mm_request_send(sock, MONITOR_ANS_RSACHALLENGE, m);
monitor_permit(mon_dispatch, MONITOR_REQ_RSARESPONSE, 1);
xfree(blob);
key_free(key);
return (0);
}
int
mm_answer_rsa_response(int sock, Buffer *m)
{
Key *key = NULL;
u_char *blob, *response;
u_int blen, len;
int success;
debug3("%s entering", __func__);
if (!authctxt->valid)
fatal("%s: authctxt not valid", __func__);
if (ssh1_challenge == NULL)
fatal("%s: no ssh1_challenge", __func__);
blob = buffer_get_string(m, &blen);
if (!monitor_allowed_key(blob, blen))
fatal("%s: bad key, not previously allowed", __func__);
if (key_blobtype != MM_RSAUSERKEY && key_blobtype != MM_RSAHOSTKEY)
fatal("%s: key type mismatch: %d", __func__, key_blobtype);
if ((key = key_from_blob(blob, blen)) == NULL)
fatal("%s: received bad key", __func__);
response = buffer_get_string(m, &len);
if (len != 16)
fatal("%s: received bad response to challenge", __func__);
success = auth_rsa_verify_response(key, ssh1_challenge, response);
xfree(blob);
key_free(key);
xfree(response);
auth_method = key_blobtype == MM_RSAUSERKEY ? "rsa" : "rhosts-rsa";
/* reset state */
BN_clear_free(ssh1_challenge);
ssh1_challenge = NULL;
monitor_reset_key_state();
buffer_clear(m);
buffer_put_int(m, success);
mm_request_send(sock, MONITOR_ANS_RSARESPONSE, m);
return (success);
}
int
mm_answer_term(int sock, Buffer *req)
{
extern struct monitor *pmonitor;
int res, status;
debug3("%s: tearing down sessions", __func__);
/* The child is terminating */
session_destroy_all(&mm_session_close);
#ifdef USE_PAM
if (options.use_pam)
sshpam_cleanup();
#endif
while (waitpid(pmonitor->m_pid, &status, 0) == -1)
if (errno != EINTR)
exit(1);
res = WIFEXITED(status) ? WEXITSTATUS(status) : 1;
/* Terminate process */
exit(res);
}
#ifdef SSH_AUDIT_EVENTS
/* Report that an audit event occurred */
int
mm_answer_audit_event(int socket, Buffer *m)
{
ssh_audit_event_t event;
debug3("%s entering", __func__);
event = buffer_get_int(m);
switch(event) {
case SSH_AUTH_FAIL_PUBKEY:
case SSH_AUTH_FAIL_HOSTBASED:
case SSH_AUTH_FAIL_GSSAPI:
case SSH_LOGIN_EXCEED_MAXTRIES:
case SSH_LOGIN_ROOT_DENIED:
case SSH_CONNECTION_CLOSE:
case SSH_INVALID_USER:
audit_event(event);
break;
default:
fatal("Audit event type %d not permitted", event);
}
return (0);
}
int
mm_answer_audit_command(int socket, Buffer *m)
{
u_int len;
char *cmd;
debug3("%s entering", __func__);
cmd = buffer_get_string(m, &len);
/* sanity check command, if so how? */
audit_run_command(cmd);
xfree(cmd);
return (0);
}
#endif /* SSH_AUDIT_EVENTS */
void
monitor_apply_keystate(struct monitor *pmonitor)
{
if (compat20) {
set_newkeys(MODE_IN);
set_newkeys(MODE_OUT);
} else {
packet_set_protocol_flags(child_state.ssh1protoflags);
packet_set_encryption_key(child_state.ssh1key,
child_state.ssh1keylen, child_state.ssh1cipher);
xfree(child_state.ssh1key);
}
/* for rc4 and other stateful ciphers */
packet_set_keycontext(MODE_OUT, child_state.keyout);
xfree(child_state.keyout);
packet_set_keycontext(MODE_IN, child_state.keyin);
xfree(child_state.keyin);
if (!compat20) {
packet_set_iv(MODE_OUT, child_state.ivout);
xfree(child_state.ivout);
packet_set_iv(MODE_IN, child_state.ivin);
xfree(child_state.ivin);
}
memcpy(&incoming_stream, &child_state.incoming,
sizeof(incoming_stream));
memcpy(&outgoing_stream, &child_state.outgoing,
sizeof(outgoing_stream));
/* Update with new address */
if (options.compression)
mm_init_compression(pmonitor->m_zlib);
/* Network I/O buffers */
/* XXX inefficient for large buffers, need: buffer_init_from_string */
buffer_clear(packet_get_input());
buffer_append(packet_get_input(), child_state.input, child_state.ilen);
memset(child_state.input, 0, child_state.ilen);
xfree(child_state.input);
buffer_clear(packet_get_output());
buffer_append(packet_get_output(), child_state.output,
child_state.olen);
memset(child_state.output, 0, child_state.olen);
xfree(child_state.output);
/* Roaming */
if (compat20)
roam_set_bytes(child_state.sent_bytes, child_state.recv_bytes);
}
static Kex *
mm_get_kex(Buffer *m)
{
Kex *kex;
void *blob;
u_int bloblen;
kex = xcalloc(1, sizeof(*kex));
kex->session_id = buffer_get_string(m, &kex->session_id_len);
if (session_id2 == NULL ||
kex->session_id_len != session_id2_len ||
timingsafe_bcmp(kex->session_id, session_id2, session_id2_len) != 0)
fatal("mm_get_get: internal error: bad session id");
kex->we_need = buffer_get_int(m);
kex->kex[KEX_DH_GRP1_SHA1] = kexdh_server;
kex->kex[KEX_DH_GRP14_SHA1] = kexdh_server;
kex->kex[KEX_DH_GEX_SHA1] = kexgex_server;
kex->kex[KEX_DH_GEX_SHA256] = kexgex_server;
kex->kex[KEX_ECDH_SHA2] = kexecdh_server;
kex->server = 1;
kex->hostkey_type = buffer_get_int(m);
kex->kex_type = buffer_get_int(m);
blob = buffer_get_string(m, &bloblen);
buffer_init(&kex->my);
buffer_append(&kex->my, blob, bloblen);
xfree(blob);
blob = buffer_get_string(m, &bloblen);
buffer_init(&kex->peer);
buffer_append(&kex->peer, blob, bloblen);
xfree(blob);
kex->done = 1;
kex->flags = buffer_get_int(m);
kex->client_version_string = buffer_get_string(m, NULL);
kex->server_version_string = buffer_get_string(m, NULL);
kex->load_host_public_key=&get_hostkey_public_by_type;
kex->load_host_private_key=&get_hostkey_private_by_type;
kex->host_key_index=&get_hostkey_index;
return (kex);
}
/* This function requries careful sanity checking */
void
mm_get_keystate(struct monitor *pmonitor)
{
Buffer m;
u_char *blob, *p;
u_int bloblen, plen;
u_int32_t seqnr, packets;
u_int64_t blocks, bytes;
debug3("%s: Waiting for new keys", __func__);
buffer_init(&m);
mm_request_receive_expect(pmonitor->m_sendfd, MONITOR_REQ_KEYEXPORT, &m);
if (!compat20) {
child_state.ssh1protoflags = buffer_get_int(&m);
child_state.ssh1cipher = buffer_get_int(&m);
child_state.ssh1key = buffer_get_string(&m,
&child_state.ssh1keylen);
child_state.ivout = buffer_get_string(&m,
&child_state.ivoutlen);
child_state.ivin = buffer_get_string(&m, &child_state.ivinlen);
goto skip;
} else {
/* Get the Kex for rekeying */
*pmonitor->m_pkex = mm_get_kex(&m);
}
blob = buffer_get_string(&m, &bloblen);
current_keys[MODE_OUT] = mm_newkeys_from_blob(blob, bloblen);
xfree(blob);
debug3("%s: Waiting for second key", __func__);
blob = buffer_get_string(&m, &bloblen);
current_keys[MODE_IN] = mm_newkeys_from_blob(blob, bloblen);
xfree(blob);
/* Now get sequence numbers for the packets */
seqnr = buffer_get_int(&m);
blocks = buffer_get_int64(&m);
packets = buffer_get_int(&m);
bytes = buffer_get_int64(&m);
packet_set_state(MODE_OUT, seqnr, blocks, packets, bytes);
seqnr = buffer_get_int(&m);
blocks = buffer_get_int64(&m);
packets = buffer_get_int(&m);
bytes = buffer_get_int64(&m);
packet_set_state(MODE_IN, seqnr, blocks, packets, bytes);
skip:
/* Get the key context */
child_state.keyout = buffer_get_string(&m, &child_state.keyoutlen);
child_state.keyin = buffer_get_string(&m, &child_state.keyinlen);
debug3("%s: Getting compression state", __func__);
/* Get compression state */
p = buffer_get_string(&m, &plen);
if (plen != sizeof(child_state.outgoing))
fatal("%s: bad request size", __func__);
memcpy(&child_state.outgoing, p, sizeof(child_state.outgoing));
xfree(p);
p = buffer_get_string(&m, &plen);
if (plen != sizeof(child_state.incoming))
fatal("%s: bad request size", __func__);
memcpy(&child_state.incoming, p, sizeof(child_state.incoming));
xfree(p);
/* Network I/O buffers */
debug3("%s: Getting Network I/O buffers", __func__);
child_state.input = buffer_get_string(&m, &child_state.ilen);
child_state.output = buffer_get_string(&m, &child_state.olen);
/* Roaming */
if (compat20) {
child_state.sent_bytes = buffer_get_int64(&m);
child_state.recv_bytes = buffer_get_int64(&m);
}
buffer_free(&m);
}
/* Allocation functions for zlib */
void *
mm_zalloc(struct mm_master *mm, u_int ncount, u_int size)
{
size_t len = (size_t) size * ncount;
void *address;
if (len == 0 || ncount > SIZE_T_MAX / size)
fatal("%s: mm_zalloc(%u, %u)", __func__, ncount, size);
address = mm_malloc(mm, len);
return (address);
}
void
mm_zfree(struct mm_master *mm, void *address)
{
mm_free(mm, address);
}
void
mm_init_compression(struct mm_master *mm)
{
outgoing_stream.zalloc = (alloc_func)mm_zalloc;
outgoing_stream.zfree = (free_func)mm_zfree;
outgoing_stream.opaque = mm;
incoming_stream.zalloc = (alloc_func)mm_zalloc;
incoming_stream.zfree = (free_func)mm_zfree;
incoming_stream.opaque = mm;
}
/* XXX */
#define FD_CLOSEONEXEC(x) do { \
if (fcntl(x, F_SETFD, FD_CLOEXEC) == -1) \
fatal("fcntl(%d, F_SETFD)", x); \
} while (0)
static void
monitor_openfds(struct monitor *mon, int do_logfds)
{
int pair[2];
if (socketpair(AF_UNIX, SOCK_STREAM, 0, pair) == -1)
fatal("%s: socketpair: %s", __func__, strerror(errno));
FD_CLOSEONEXEC(pair[0]);
FD_CLOSEONEXEC(pair[1]);
mon->m_recvfd = pair[0];
mon->m_sendfd = pair[1];
if (do_logfds) {
if (pipe(pair) == -1)
fatal("%s: pipe: %s", __func__, strerror(errno));
FD_CLOSEONEXEC(pair[0]);
FD_CLOSEONEXEC(pair[1]);
mon->m_log_recvfd = pair[0];
mon->m_log_sendfd = pair[1];
} else
mon->m_log_recvfd = mon->m_log_sendfd = -1;
}
#define MM_MEMSIZE 65536
struct monitor *
monitor_init(void)
{
struct monitor *mon;
mon = xcalloc(1, sizeof(*mon));
monitor_openfds(mon, 1);
/* Used to share zlib space across processes */
if (options.compression) {
mon->m_zback = mm_create(NULL, MM_MEMSIZE);
mon->m_zlib = mm_create(mon->m_zback, 20 * MM_MEMSIZE);
/* Compression needs to share state across borders */
mm_init_compression(mon->m_zlib);
}
return mon;
}
void
monitor_reinit(struct monitor *mon)
{
monitor_openfds(mon, 0);
}
#ifdef GSSAPI
int
mm_answer_gss_setup_ctx(int sock, Buffer *m)
{
gss_OID_desc goid;
OM_uint32 major;
u_int len;
goid.elements = buffer_get_string(m, &len);
goid.length = len;
major = ssh_gssapi_server_ctx(&gsscontext, &goid);
xfree(goid.elements);
buffer_clear(m);
buffer_put_int(m, major);
mm_request_send(sock, MONITOR_ANS_GSSSETUP, m);
/* Now we have a context, enable the step */
monitor_permit(mon_dispatch, MONITOR_REQ_GSSSTEP, 1);
return (0);
}
int
mm_answer_gss_accept_ctx(int sock, Buffer *m)
{
gss_buffer_desc in;
gss_buffer_desc out = GSS_C_EMPTY_BUFFER;
OM_uint32 major, minor;
OM_uint32 flags = 0; /* GSI needs this */
u_int len;
in.value = buffer_get_string(m, &len);
in.length = len;
major = ssh_gssapi_accept_ctx(gsscontext, &in, &out, &flags);
xfree(in.value);
buffer_clear(m);
buffer_put_int(m, major);
buffer_put_string(m, out.value, out.length);
buffer_put_int(m, flags);
mm_request_send(sock, MONITOR_ANS_GSSSTEP, m);
gss_release_buffer(&minor, &out);
if (major == GSS_S_COMPLETE) {
monitor_permit(mon_dispatch, MONITOR_REQ_GSSSTEP, 0);
monitor_permit(mon_dispatch, MONITOR_REQ_GSSUSEROK, 1);
monitor_permit(mon_dispatch, MONITOR_REQ_GSSCHECKMIC, 1);
}
return (0);
}
int
mm_answer_gss_checkmic(int sock, Buffer *m)
{
gss_buffer_desc gssbuf, mic;
OM_uint32 ret;
u_int len;
gssbuf.value = buffer_get_string(m, &len);
gssbuf.length = len;
mic.value = buffer_get_string(m, &len);
mic.length = len;
ret = ssh_gssapi_checkmic(gsscontext, &gssbuf, &mic);
xfree(gssbuf.value);
xfree(mic.value);
buffer_clear(m);
buffer_put_int(m, ret);
mm_request_send(sock, MONITOR_ANS_GSSCHECKMIC, m);
if (!GSS_ERROR(ret))
monitor_permit(mon_dispatch, MONITOR_REQ_GSSUSEROK, 1);
return (0);
}
int
mm_answer_gss_userok(int sock, Buffer *m)
{
int authenticated;
authenticated = authctxt->valid && ssh_gssapi_userok(authctxt->user);
buffer_clear(m);
buffer_put_int(m, authenticated);
debug3("%s: sending result %d", __func__, authenticated);
mm_request_send(sock, MONITOR_ANS_GSSUSEROK, m);
auth_method = "gssapi-with-mic";
/* Monitor loop will terminate if authenticated */
return (authenticated);
}
#endif /* GSSAPI */
#ifdef JPAKE
int
mm_answer_jpake_step1(int sock, Buffer *m)
{
struct jpake_ctx *pctx;
u_char *x3_proof, *x4_proof;
u_int x3_proof_len, x4_proof_len;
if (!options.zero_knowledge_password_authentication)
fatal("zero_knowledge_password_authentication disabled");
if (authctxt->jpake_ctx != NULL)
fatal("%s: authctxt->jpake_ctx already set (%p)",
__func__, authctxt->jpake_ctx);
authctxt->jpake_ctx = pctx = jpake_new();
jpake_step1(pctx->grp,
&pctx->server_id, &pctx->server_id_len,
&pctx->x3, &pctx->x4, &pctx->g_x3, &pctx->g_x4,
&x3_proof, &x3_proof_len,
&x4_proof, &x4_proof_len);
JPAKE_DEBUG_CTX((pctx, "step1 done in %s", __func__));
buffer_clear(m);
buffer_put_string(m, pctx->server_id, pctx->server_id_len);
buffer_put_bignum2(m, pctx->g_x3);
buffer_put_bignum2(m, pctx->g_x4);
buffer_put_string(m, x3_proof, x3_proof_len);
buffer_put_string(m, x4_proof, x4_proof_len);
debug3("%s: sending step1", __func__);
mm_request_send(sock, MONITOR_ANS_JPAKE_STEP1, m);
bzero(x3_proof, x3_proof_len);
bzero(x4_proof, x4_proof_len);
xfree(x3_proof);
xfree(x4_proof);
monitor_permit(mon_dispatch, MONITOR_REQ_JPAKE_GET_PWDATA, 1);
monitor_permit(mon_dispatch, MONITOR_REQ_JPAKE_STEP1, 0);
return 0;
}
int
mm_answer_jpake_get_pwdata(int sock, Buffer *m)
{
struct jpake_ctx *pctx = authctxt->jpake_ctx;
char *hash_scheme, *salt;
if (pctx == NULL)
fatal("%s: pctx == NULL", __func__);
auth2_jpake_get_pwdata(authctxt, &pctx->s, &hash_scheme, &salt);
buffer_clear(m);
/* pctx->s is sensitive, not returned to slave */
buffer_put_cstring(m, hash_scheme);
buffer_put_cstring(m, salt);
debug3("%s: sending pwdata", __func__);
mm_request_send(sock, MONITOR_ANS_JPAKE_GET_PWDATA, m);
bzero(hash_scheme, strlen(hash_scheme));
bzero(salt, strlen(salt));
xfree(hash_scheme);
xfree(salt);
monitor_permit(mon_dispatch, MONITOR_REQ_JPAKE_STEP2, 1);
return 0;
}
int
mm_answer_jpake_step2(int sock, Buffer *m)
{
struct jpake_ctx *pctx = authctxt->jpake_ctx;
u_char *x1_proof, *x2_proof, *x4_s_proof;
u_int x1_proof_len, x2_proof_len, x4_s_proof_len;
if (pctx == NULL)
fatal("%s: pctx == NULL", __func__);
if ((pctx->g_x1 = BN_new()) == NULL ||
(pctx->g_x2 = BN_new()) == NULL)
fatal("%s: BN_new", __func__);
buffer_get_bignum2(m, pctx->g_x1);
buffer_get_bignum2(m, pctx->g_x2);
pctx->client_id = buffer_get_string(m, &pctx->client_id_len);
x1_proof = buffer_get_string(m, &x1_proof_len);
x2_proof = buffer_get_string(m, &x2_proof_len);
jpake_step2(pctx->grp, pctx->s, pctx->g_x3,
pctx->g_x1, pctx->g_x2, pctx->x4,
pctx->client_id, pctx->client_id_len,
pctx->server_id, pctx->server_id_len,
x1_proof, x1_proof_len,
x2_proof, x2_proof_len,
&pctx->b,
&x4_s_proof, &x4_s_proof_len);
JPAKE_DEBUG_CTX((pctx, "step2 done in %s", __func__));
bzero(x1_proof, x1_proof_len);
bzero(x2_proof, x2_proof_len);
xfree(x1_proof);
xfree(x2_proof);
buffer_clear(m);
buffer_put_bignum2(m, pctx->b);
buffer_put_string(m, x4_s_proof, x4_s_proof_len);
debug3("%s: sending step2", __func__);
mm_request_send(sock, MONITOR_ANS_JPAKE_STEP2, m);
bzero(x4_s_proof, x4_s_proof_len);
xfree(x4_s_proof);
monitor_permit(mon_dispatch, MONITOR_REQ_JPAKE_KEY_CONFIRM, 1);
return 0;
}
int
mm_answer_jpake_key_confirm(int sock, Buffer *m)
{
struct jpake_ctx *pctx = authctxt->jpake_ctx;
u_char *x2_s_proof;
u_int x2_s_proof_len;
if (pctx == NULL)
fatal("%s: pctx == NULL", __func__);
if ((pctx->a = BN_new()) == NULL)
fatal("%s: BN_new", __func__);
buffer_get_bignum2(m, pctx->a);
x2_s_proof = buffer_get_string(m, &x2_s_proof_len);
jpake_key_confirm(pctx->grp, pctx->s, pctx->a,
pctx->x4, pctx->g_x3, pctx->g_x4, pctx->g_x1, pctx->g_x2,
pctx->server_id, pctx->server_id_len,
pctx->client_id, pctx->client_id_len,
session_id2, session_id2_len,
x2_s_proof, x2_s_proof_len,
&pctx->k,
&pctx->h_k_sid_sessid, &pctx->h_k_sid_sessid_len);
JPAKE_DEBUG_CTX((pctx, "key_confirm done in %s", __func__));
bzero(x2_s_proof, x2_s_proof_len);
buffer_clear(m);
/* pctx->k is sensitive, not sent */
buffer_put_string(m, pctx->h_k_sid_sessid, pctx->h_k_sid_sessid_len);
debug3("%s: sending confirmation hash", __func__);
mm_request_send(sock, MONITOR_ANS_JPAKE_KEY_CONFIRM, m);
monitor_permit(mon_dispatch, MONITOR_REQ_JPAKE_CHECK_CONFIRM, 1);
return 0;
}
int
mm_answer_jpake_check_confirm(int sock, Buffer *m)
{
int authenticated = 0;
u_char *peer_confirm_hash;
u_int peer_confirm_hash_len;
struct jpake_ctx *pctx = authctxt->jpake_ctx;
if (pctx == NULL)
fatal("%s: pctx == NULL", __func__);
peer_confirm_hash = buffer_get_string(m, &peer_confirm_hash_len);
authenticated = jpake_check_confirm(pctx->k,
pctx->client_id, pctx->client_id_len,
session_id2, session_id2_len,
peer_confirm_hash, peer_confirm_hash_len) && authctxt->valid;
JPAKE_DEBUG_CTX((pctx, "check_confirm done in %s", __func__));
bzero(peer_confirm_hash, peer_confirm_hash_len);
xfree(peer_confirm_hash);
buffer_clear(m);
buffer_put_int(m, authenticated);
debug3("%s: sending result %d", __func__, authenticated);
mm_request_send(sock, MONITOR_ANS_JPAKE_CHECK_CONFIRM, m);
monitor_permit(mon_dispatch, MONITOR_REQ_JPAKE_STEP1, 1);
auth_method = "jpake-01@openssh.com";
return authenticated;
}
#endif /* JPAKE */