+/* $OpenBSD: monitor.c,v 1.99 2008/07/10 18:08:11 markus Exp $ */
/*
* Copyright 2002 Niels Provos <provos@citi.umich.edu>
* Copyright 2002 Markus Friedl <markus@openbsd.org>
*/
#include "includes.h"
-RCSID("$OpenBSD: monitor.c,v 1.61 2004/07/17 05:31:41 dtucker Exp $");
-#include <openssl/dh.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 SKEY
#include <skey.h>
#endif
+#include <openssl/dh.h>
+
+#include "openbsd-compat/sys-queue.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 */
#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 "xmalloc.h"
#include "misc.h"
-#include "buffer.h"
-#include "bufaux.h"
#include "compat.h"
#include "ssh2.h"
#ifdef GSSAPI
-#include "ssh-gss.h"
static Gssctxt *gsscontext = NULL;
#endif
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 Authctxt *authctxt;
static BIGNUM *ssh1_challenge = NULL; /* used for ssh1 rsa auth */
#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)
{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},
+ {MONITOR_REQ_BSDAUTHRESPOND, MON_AUTH, mm_answer_bsdauthrespond},
#endif
#ifdef SKEY
{MONITOR_REQ_SKEYQUERY, MON_ISAUTH, mm_answer_skeyquery},
{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}
};
{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, mm_answer_rsa_keyallowed},
- {MONITOR_REQ_KEYALLOWED, MON_ISAUTH, mm_answer_keyallowed},
+ {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},
+ {MONITOR_REQ_BSDAUTHRESPOND, MON_AUTH, mm_answer_bsdauthrespond},
#endif
#ifdef SKEY
{MONITOR_REQ_SKEYQUERY, MON_ISAUTH, mm_answer_skeyquery},
{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}
};
{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}
};
authctxt = _authctxt;
memset(authctxt, 0, sizeof(*authctxt));
+ authctxt->loginmsg = &loginmsg;
+
if (compat20) {
mon_dispatch = mon_dispatch_proto20;
/* The first few requests do not require asynchronous access */
while (!authenticated) {
- authenticated = monitor_read(pmonitor, mon_dispatch, &ent);
+ auth_method = "unknown";
+ authenticated = (monitor_read(pmonitor, mon_dispatch, &ent) == 1);
if (authenticated) {
if (!(ent->flags & MON_AUTHDECIDE))
fatal("%s: unexpected authentication from %d",
#endif
}
- if (ent->flags & MON_AUTHDECIDE) {
+ if (ent->flags & (MON_AUTHDECIDE|MON_ALOG)) {
auth_log(authctxt, authenticated, auth_method,
compat20 ? " ssh2" : "");
if (!authenticated)
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);
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;
keyid = buffer_get_int(m);
p = buffer_get_string(m, &datlen);
- if (datlen != 20)
+ /*
+ * Supported KEX types will only return SHA1 (20 byte) or
+ * SHA256 (32 byte) hashes
+ */
+ if (datlen != 20 && datlen != 32)
fatal("%s: data length incorrect: %u", __func__, datlen);
/* save session id, it will be passed on the first call */
buffer_put_cstring(m, pwent->pw_shell);
out:
+ buffer_put_string(m, &options, sizeof(options));
+ if (options.banner != NULL)
+ buffer_put_cstring(m, options.banner);
debug3("%s: sending MONITOR_ANS_PWNAM: %d", __func__, allowed);
mm_request_send(sock, MONITOR_ANS_PWNAM, m);
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);
mm_answer_pam_query(int sock, Buffer *m)
{
char *name, *info, **prompts;
- u_int num, *echo_on;
- int i, ret;
+ u_int i, num, *echo_on;
+ int ret;
debug3("%s", __func__);
sshpam_authok = 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);
}
mm_answer_pam_respond(int sock, Buffer *m)
{
char **resp;
- u_int num;
- int i, ret;
+ u_int i, num;
+ int ret;
debug3("%s", __func__);
sshpam_authok = NULL;
num = buffer_get_int(m);
if (num > 0) {
- resp = xmalloc(num * sizeof(char *));
+ 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);
(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
debug3("%s: key_from_blob: %p", __func__, key);
if (key != NULL && authctxt->valid) {
- switch(type) {
+ 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);
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" : "disallowed");
+ __func__, key, allowed ? "allowed" : "not allowed");
buffer_clear(m);
buffer_put_int(m, allowed);
verified = key_verify(key, signature, signaturelen, data, datalen);
debug3("%s: key %p signature %s",
- __func__, key, verified ? "verified" : "unverified");
+ __func__, key, (verified == 1) ? "verified" : "unverified");
key_free(key);
xfree(blob);
buffer_put_int(m, verified);
mm_request_send(sock, MONITOR_ANS_KEYVERIFY, m);
- return (verified);
+ return (verified == 1);
}
static void
fromlen = sizeof(from);
if (packet_connection_is_on_socket()) {
if (getpeername(packet_get_connection_in(),
- (struct sockaddr *) & from, &fromlen) < 0) {
+ (struct sockaddr *)&from, &fromlen) < 0) {
debug("getpeername: %.100s", strerror(errno));
cleanup_exit(255);
}
{
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);
+ debug3("%s: tty %s ptyfd %d", __func__, s->tty, s->ptyfd);
session_pty_cleanup2(s);
}
- s->used = 0;
+ session_unused(s->self);
}
int
mm_request_send(sock, MONITOR_ANS_PTY, m);
- mm_send_fd(sock, s->ptyfd);
- mm_send_fd(sock, s->ttyfd);
+ 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)
/* no need to dup() because nobody closes ptyfd */
s->ptymaster = s->ptyfd;
- debug3("%s: tty %s ptyfd %d", __func__, s->tty, s->ttyfd);
+ debug3("%s: tty %s ptyfd %d", __func__, s->tty, s->ttyfd);
return (0);
int rsafail;
/* Turn off permissions */
- monitor_permit(mon_dispatch, MONITOR_REQ_SESSKEY, 1);
+ monitor_permit(mon_dispatch, MONITOR_REQ_SESSKEY, 0);
if ((p = BN_new()) == NULL)
fatal("%s: BN_new", __func__);
debug3("%s entering", __func__);
+ auth_method = "rsa";
if (options.rsa_authentication && authctxt->valid) {
if ((client_n = BN_new()) == NULL)
fatal("%s: BN_new", __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);
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)
{
void *blob;
u_int bloblen;
- kex = xmalloc(sizeof(*kex));
- memset(kex, 0, sizeof(*kex));
+ 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) ||
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->server = 1;
kex->hostkey_type = buffer_get_int(m);
kex->kex_type = buffer_get_int(m);
u_char *blob, *p;
u_int bloblen, plen;
u_int32_t seqnr, packets;
- u_int64_t blocks;
+ u_int64_t blocks, bytes;
debug3("%s: Waiting for new keys", __func__);
seqnr = buffer_get_int(&m);
blocks = buffer_get_int64(&m);
packets = buffer_get_int(&m);
- packet_set_state(MODE_OUT, seqnr, blocks, packets);
+ 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);
- packet_set_state(MODE_IN, seqnr, blocks, packets);
+ bytes = buffer_get_int64(&m);
+ packet_set_state(MODE_IN, seqnr, blocks, packets, bytes);
skip:
/* Get the key context */
struct monitor *mon;
int pair[2];
- mon = xmalloc(sizeof(*mon));
+ mon = xcalloc(1, sizeof(*mon));
- mon->m_pid = 0;
monitor_socketpair(pair);
mon->m_recvfd = pair[0];
buffer_clear(m);
buffer_put_int(m, major);
- mm_request_send(sock,MONITOR_ANS_GSSSETUP, m);
+ mm_request_send(sock, MONITOR_ANS_GSSSETUP, m);
/* Now we have a context, enable the step */
monitor_permit(mon_dispatch, MONITOR_REQ_GSSSTEP, 1);
{
gss_buffer_desc in;
gss_buffer_desc out = GSS_C_EMPTY_BUFFER;
- OM_uint32 major,minor;
+ OM_uint32 major, minor;
OM_uint32 flags = 0; /* GSI needs this */
u_int len;
gss_release_buffer(&minor, &out);
- if (major==GSS_S_COMPLETE) {
+ 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);
debug3("%s: sending result %d", __func__, authenticated);
mm_request_send(sock, MONITOR_ANS_GSSUSEROK, m);
- auth_method="gssapi-with-mic";
+ auth_method = "gssapi-with-mic";
/* Monitor loop will terminate if authenticated */
return (authenticated);
andersk / gssapi-openssh.git / blobdiff