diff -up openssh-7.6p1/audit-bsm.c.audit openssh-7.6p1/audit-bsm.c
--- openssh-7.6p1/audit-bsm.c.audit 2017-10-02 21:34:26.000000000 +0200
+++ openssh-7.6p1/audit-bsm.c 2017-10-04 17:18:32.834505048 +0200
@@ -373,10 +373,23 @@ audit_connection_from(const char *host,
#endif
}
-void
+int
audit_run_command(const char *command)
{
/* not implemented */
+ return 0;
+}
+
+void
+audit_end_command(int handle, const char *command)
+{
+ /* not implemented */
+}
+
+void
+audit_count_session_open(void)
+{
+ /* not necessary */
}
void
@@ -391,6 +404,12 @@ audit_session_close(struct logininfo *li
/* not implemented */
}
+int
+audit_keyusage(int host_user, char *fp, int rv)
+{
+ /* not implemented */
+}
+
void
audit_event(ssh_audit_event_t event)
{
@@ -452,4 +471,34 @@ audit_event(ssh_audit_event_t event)
debug("%s: unhandled event %d", __func__, event);
}
}
+
+void
+audit_unsupported_body(int what)
+{
+ /* not implemented */
+}
+
+void
+audit_kex_body(int ctos, char *enc, char *mac, char *compress, char *pfs, pid_t pid, uid_t uid)
+{
+ /* not implemented */
+}
+
+void
+audit_session_key_free_body(int ctos, pid_t pid, uid_t uid)
+{
+ /* not implemented */
+}
+
+void
+audit_destroy_sensitive_data(const char *fp)
+{
+ /* not implemented */
+}
+
+void
+audit_destroy_sensitive_data(const char *fp, pid_t pid, uid_t uid)
+{
+ /* not implemented */
+}
#endif /* BSM */
diff -up openssh-7.6p1/audit.c.audit openssh-7.6p1/audit.c
--- openssh-7.6p1/audit.c.audit 2017-10-02 21:34:26.000000000 +0200
+++ openssh-7.6p1/audit.c 2017-10-04 17:18:32.834505048 +0200
@@ -34,6 +35,12 @@
#include "log.h"
#include "hostfile.h"
#include "auth.h"
+#include "ssh-gss.h"
+#include "monitor_wrap.h"
+#include "xmalloc.h"
+#include "misc.h"
+#include "servconf.h"
+#include "ssherr.h"
/*
* Care must be taken when using this since it WILL NOT be initialized when
@@ -41,6 +47,7 @@
* audit_event(CONNECTION_ABANDON) is called. Test for NULL before using.
*/
extern Authctxt *the_authctxt;
+extern ServerOptions options;
/* Maybe add the audit class to struct Authmethod? */
ssh_audit_event_t
@@ -69,13 +76,10 @@ audit_classify_auth(const char *method)
const char *
audit_username(void)
{
- static const char unknownuser[] = "(unknown user)";
- static const char invaliduser[] = "(invalid user)";
+ static const char unknownuser[] = "(unknown)";
- if (the_authctxt == NULL || the_authctxt->user == NULL)
+ if (the_authctxt == NULL || the_authctxt->user == NULL || !the_authctxt->valid)
return (unknownuser);
- if (!the_authctxt->valid)
- return (invaliduser);
return (the_authctxt->user);
}
@@ -109,6 +113,35 @@ audit_event_lookup(ssh_audit_event_t ev)
return(event_lookup[i].name);
}
+void
+audit_key(int host_user, int *rv, const struct sshkey *key)
+{
+ char *fp;
+
+ fp = sshkey_fingerprint(key, options.fingerprint_hash, SSH_FP_HEX);
+ if (audit_keyusage(host_user, fp, (*rv == 0)) == 0)
+ *rv = -SSH_ERR_INTERNAL_ERROR;
+ free(fp);
+}
+
+void
+audit_unsupported(int what)
+{
+ PRIVSEP(audit_unsupported_body(what));
+}
+
+void
+audit_kex(int ctos, char *enc, char *mac, char *comp, char *pfs)
+{
+ PRIVSEP(audit_kex_body(ctos, enc, mac, comp, pfs, getpid(), getuid()));
+}
+
+void
+audit_session_key_free(int ctos)
+{
+ PRIVSEP(audit_session_key_free_body(ctos, getpid(), getuid()));
+}
+
# ifndef CUSTOM_SSH_AUDIT_EVENTS
/*
* Null implementations of audit functions.
@@ -138,6 +173,17 @@ audit_event(ssh_audit_event_t event)
}
/*
+ * Called when a child process has called, or will soon call,
+ * audit_session_open.
+ */
+void
+audit_count_session_open(void)
+{
+ debug("audit count session open euid %d user %s", geteuid(),
+ audit_username());
+}
+
+/*
* Called when a user session is started. Argument is the tty allocated to
* the session, or NULL if no tty was allocated.
*
@@ -172,13 +218,82 @@ audit_session_close(struct logininfo *li
/*
* This will be called when a user runs a non-interactive command. Note that
* it may be called multiple times for a single connection since SSH2 allows
- * multiple sessions within a single connection.
+ * multiple sessions within a single connection. Returns a "handle" for
+ * audit_end_command.
*/
-void
+int
audit_run_command(const char *command)
{
debug("audit run command euid %d user %s command '%.200s'", geteuid(),
audit_username(), command);
+ return 0;
+}
+
+/*
+ * This will be called when the non-interactive command finishes. Note that
+ * it may be called multiple times for a single connection since SSH2 allows
+ * multiple sessions within a single connection. "handle" should come from
+ * the corresponding audit_run_command.
+ */
+void
+audit_end_command(int handle, const char *command)
+{
+ debug("audit end nopty exec euid %d user %s command '%.200s'", geteuid(),
+ audit_username(), command);
+}
+
+/*
+ * This will be called when user is successfully autherized by the RSA1/RSA/DSA key.
+ *
+ * Type is the key type, len is the key length(byte) and fp is the fingerprint of the key.
+ */
+int
+audit_keyusage(int host_user, char *fp, int rv)
+{
+ debug("audit %s key usage euid %d user %s fingerprint %s, result %d",
+ host_user ? "pubkey" : "hostbased", geteuid(), audit_username(),
+ fp, rv);
+}
+
+/*
+ * This will be called when the protocol negotiation fails.
+ */
+void
+audit_unsupported_body(int what)
+{
+ debug("audit unsupported protocol euid %d type %d", geteuid(), what);
+}
+
+/*
+ * This will be called on succesfull protocol negotiation.
+ */
+void
+audit_kex_body(int ctos, char *enc, char *mac, char *compress, char *pfs, pid_t pid,
+ uid_t uid)
+{
+ debug("audit protocol negotiation euid %d direction %d cipher %s mac %s compresion %s pfs %s from pid %ld uid %u",
+ (unsigned)geteuid(), ctos, enc, mac, compress, pfs, (long)pid,
+ (unsigned)uid);
+}
+
+/*
+ * This will be called on succesfull session key discard
+ */
+void
+audit_session_key_free_body(int ctos, pid_t pid, uid_t uid)
+{
+ debug("audit session key discard euid %u direction %d from pid %ld uid %u",
+ (unsigned)geteuid(), ctos, (long)pid, (unsigned)uid);
+}
+
+/*
+ * This will be called on destroy private part of the server key
+ */
+void
+audit_destroy_sensitive_data(const char *fp, pid_t pid, uid_t uid)
+{
+ debug("audit destroy sensitive data euid %d fingerprint %s from pid %ld uid %u",
+ geteuid(), fp, (long)pid, (unsigned)uid);
}
# endif /* !defined CUSTOM_SSH_AUDIT_EVENTS */
#endif /* SSH_AUDIT_EVENTS */
diff -up openssh-7.6p1/audit.h.audit openssh-7.6p1/audit.h
--- openssh-7.6p1/audit.h.audit 2017-10-02 21:34:26.000000000 +0200
+++ openssh-7.6p1/audit.h 2017-10-04 17:18:32.834505048 +0200
@@ -26,6 +26,7 @@
# define _SSH_AUDIT_H
#include "loginrec.h"
+#include "sshkey.h"
enum ssh_audit_event_type {
SSH_LOGIN_EXCEED_MAXTRIES,
@@ -43,13 +44,32 @@ enum ssh_audit_event_type {
SSH_CONNECTION_ABANDON, /* closed without completing auth */
SSH_AUDIT_UNKNOWN
};
+
+enum ssh_audit_kex {
+ SSH_AUDIT_UNSUPPORTED_CIPHER,
+ SSH_AUDIT_UNSUPPORTED_MAC,
+ SSH_AUDIT_UNSUPPORTED_COMPRESSION
+};
typedef enum ssh_audit_event_type ssh_audit_event_t;
+int listening_for_clients(void);
+
void audit_connection_from(const char *, int);
void audit_event(ssh_audit_event_t);
+void audit_count_session_open(void);
void audit_session_open(struct logininfo *);
void audit_session_close(struct logininfo *);
-void audit_run_command(const char *);
+int audit_run_command(const char *);
+void audit_end_command(int, const char *);
ssh_audit_event_t audit_classify_auth(const char *);
+int audit_keyusage(int, char *, int);
+void audit_key(int, int *, const struct sshkey *);
+void audit_unsupported(int);
+void audit_kex(int, char *, char *, char *, char *);
+void audit_unsupported_body(int);
+void audit_kex_body(int, char *, char *, char *, char *, pid_t, uid_t);
+void audit_session_key_free(int ctos);
+void audit_session_key_free_body(int ctos, pid_t, uid_t);
+void audit_destroy_sensitive_data(const char *, pid_t, uid_t);
#endif /* _SSH_AUDIT_H */
diff -up openssh-7.6p1/audit-linux.c.audit openssh-7.6p1/audit-linux.c
--- openssh-7.6p1/audit-linux.c.audit 2017-10-02 21:34:26.000000000 +0200
+++ openssh-7.6p1/audit-linux.c 2017-10-04 17:18:32.835505053 +0200
@@ -33,27 +33,40 @@
#include "log.h"
#include "audit.h"
+#include "sshkey.h"
+#include "hostfile.h"
+#include "auth.h"
+#include "misc.h" /* servconf.h needs misc.h for struct ForwardOptions */
+#include "servconf.h"
#include "canohost.h"
#include "packet.h"
-
+#include "cipher.h"
+#include "channels.h"
+#include "session.h"
+
+#define AUDIT_LOG_SIZE 256
+
+extern ServerOptions options;
+extern Authctxt *the_authctxt;
+extern u_int utmp_len;
const char *audit_username(void);
-int
-linux_audit_record_event(int uid, const char *username, const char *hostname,
- const char *ip, const char *ttyn, int success)
+static void
+linux_audit_user_logxxx(int uid, const char *username,
+ const char *ip, const char *ttyn, int success, int event)
{
int audit_fd, rc, saved_errno;
if ((audit_fd = audit_open()) < 0) {
if (errno == EINVAL || errno == EPROTONOSUPPORT ||
errno == EAFNOSUPPORT)
- return 1; /* No audit support in kernel */
+ return; /* No audit support in kernel */
else
- return 0; /* Must prevent login */
+ goto fatal_report; /* Must prevent login */
}
- rc = audit_log_acct_message(audit_fd, AUDIT_USER_LOGIN,
+ rc = audit_log_acct_message(audit_fd, event,
NULL, "login", username ? username : "(unknown)",
- username == NULL ? uid : -1, hostname, ip, ttyn, success);
+ username == NULL ? uid : -1, NULL, ip, ttyn, success);
saved_errno = errno;
close(audit_fd);
@@ -65,9 +78,96 @@ linux_audit_record_event(int uid, const
rc = 0;
errno = saved_errno;
- return rc >= 0;
+ if (rc < 0) {
+fatal_report:
+ fatal("linux_audit_write_entry failed: %s", strerror(errno));
+ }
+}
+
+static void
+linux_audit_user_auth(int uid, const char *username,
+ const char *ip, const char *ttyn, int success, int event)
+{
+ int audit_fd, rc, saved_errno;
+ static const char *event_name[] = {
+ "maxtries exceeded",
+ "root denied",
+ "success",
+ "none",
+ "password",
+ "challenge-response",
+ "pubkey",
+ "hostbased",
+ "gssapi",
+ "invalid user",
+ "nologin",
+ "connection closed",
+ "connection abandoned",
+ "unknown"
+ };
+
+ audit_fd = audit_open();
+ if (audit_fd < 0) {
+ if (errno == EINVAL || errno == EPROTONOSUPPORT ||
+ errno == EAFNOSUPPORT)
+ return; /* No audit support in kernel */
+ else
+ goto fatal_report; /* Must prevent login */
+ }
+
+ if ((event < 0) || (event > SSH_AUDIT_UNKNOWN))
+ event = SSH_AUDIT_UNKNOWN;
+
+ rc = audit_log_acct_message(audit_fd, AUDIT_USER_AUTH,
+ NULL, event_name[event], username ? username : "(unknown)",
+ username == NULL ? uid : -1, NULL, ip, ttyn, success);
+ saved_errno = errno;
+ close(audit_fd);
+ /*
+ * Do not report error if the error is EPERM and sshd is run as non
+ * root user.
+ */
+ if ((rc == -EPERM) && (geteuid() != 0))
+ rc = 0;
+ errno = saved_errno;
+ if (rc < 0) {
+fatal_report:
+ fatal("linux_audit_write_entry failed: %s", strerror(errno));
+ }
+}
+
+int
+audit_keyusage(int host_user, char *fp, int rv)
+{
+ char buf[AUDIT_LOG_SIZE];
+ int audit_fd, rc, saved_errno;
+
+ audit_fd = audit_open();
+ if (audit_fd < 0) {
+ if (errno == EINVAL || errno == EPROTONOSUPPORT ||
+ errno == EAFNOSUPPORT)
+ return 1; /* No audit support in kernel */
+ else
+ return 0; /* Must prevent login */
+ }
+ snprintf(buf, sizeof(buf), "%s_auth grantors=auth-key", host_user ? "pubkey" : "hostbased");
+ rc = audit_log_acct_message(audit_fd, AUDIT_USER_AUTH, NULL,
+ buf, audit_username(), -1, NULL, ssh_remote_ipaddr(active_state), NULL, rv);
+ if ((rc < 0) && ((rc != -1) || (getuid() == 0)))
+ goto out;
+ snprintf(buf, sizeof(buf), "op=negotiate kind=auth-key fp=%s", fp);
+ rc = audit_log_user_message(audit_fd, AUDIT_CRYPTO_KEY_USER, buf, NULL,
+ ssh_remote_ipaddr(active_state), NULL, rv);
+out:
+ saved_errno = errno;
+ audit_close(audit_fd);
+ errno = saved_errno;
+ /* do not report error if the error is EPERM and sshd is run as non root user */
+ return (rc >= 0) || ((rc == -EPERM) && (getuid() != 0));
}
+static int user_login_count = 0;
+
/* Below is the sshd audit API code */
void
@@ -76,24 +177,55 @@ audit_connection_from(const char *host,
/* not implemented */
}
-void
+int
audit_run_command(const char *command)
{
- /* not implemented */
+ if (!user_login_count++)
+ linux_audit_user_logxxx(the_authctxt->pw->pw_uid, NULL,
+ ssh_remote_ipaddr(active_state),
+ "ssh", 1, AUDIT_USER_LOGIN);
+ linux_audit_user_logxxx(the_authctxt->pw->pw_uid, NULL,
+ ssh_remote_ipaddr(active_state),
+ "ssh", 1, AUDIT_USER_START);
+ return 0;
+}
+
+void
+audit_end_command(int handle, const char *command)
+{
+ linux_audit_user_logxxx(the_authctxt->pw->pw_uid, NULL,
+ ssh_remote_ipaddr(active_state),
+ "ssh", 1, AUDIT_USER_END);
+ if (user_login_count && !--user_login_count)
+ linux_audit_user_logxxx(the_authctxt->pw->pw_uid, NULL,
+ ssh_remote_ipaddr(active_state),
+ "ssh", 1, AUDIT_USER_LOGOUT);
+}
+
+void
+audit_count_session_open(void)
+{
+ user_login_count++;
}
void
audit_session_open(struct logininfo *li)
{
- if (linux_audit_record_event(li->uid, NULL, li->hostname, NULL,
- li->line, 1) == 0)
- fatal("linux_audit_write_entry failed: %s", strerror(errno));
+ if (!user_login_count++)
+ linux_audit_user_logxxx(li->uid, NULL, li->hostname,
+ li->line, 1, AUDIT_USER_LOGIN);
+ linux_audit_user_logxxx(li->uid, NULL, li->hostname,
+ li->line, 1, AUDIT_USER_START);
}
void
audit_session_close(struct logininfo *li)
{
- /* not implemented */
+ linux_audit_user_logxxx(li->uid, NULL, li->hostname,
+ li->line, 1, AUDIT_USER_END);
+ if (user_login_count && !--user_login_count)
+ linux_audit_user_logxxx(li->uid, NULL, li->hostname,
+ li->line, 1, AUDIT_USER_LOGOUT);
}
void
@@ -102,25 +231,155 @@ audit_event(ssh_audit_event_t event)
struct ssh *ssh = active_state; /* XXX */
switch(event) {
- case SSH_AUTH_SUCCESS:
- case SSH_CONNECTION_CLOSE:
case SSH_NOLOGIN:
- case SSH_LOGIN_EXCEED_MAXTRIES:
case SSH_LOGIN_ROOT_DENIED:
+ linux_audit_user_auth(-1, audit_username(),
+ ssh_remote_ipaddr(ssh), "ssh", 0, event);
+ linux_audit_user_logxxx(-1, audit_username(),
+ ssh_remote_ipaddr(ssh), "ssh", 0, AUDIT_USER_LOGIN);
break;
- case SSH_AUTH_FAIL_NONE:
case SSH_AUTH_FAIL_PASSWD:
+ if (options.use_pam)
+ break;
+ case SSH_LOGIN_EXCEED_MAXTRIES:
case SSH_AUTH_FAIL_KBDINT:
case SSH_AUTH_FAIL_PUBKEY:
case SSH_AUTH_FAIL_HOSTBASED:
case SSH_AUTH_FAIL_GSSAPI:
+ linux_audit_user_auth(-1, audit_username(),
+ ssh_remote_ipaddr(ssh), "ssh", 0, event);
+ break;
+
+ case SSH_CONNECTION_CLOSE:
+ if (user_login_count) {
+ while (user_login_count--)
+ linux_audit_user_logxxx(the_authctxt->pw->pw_uid, NULL,
+ ssh_remote_ipaddr(ssh),
+ "ssh", 1, AUDIT_USER_END);
+ linux_audit_user_logxxx(the_authctxt->pw->pw_uid, NULL,
+ ssh_remote_ipaddr(ssh),
+ "ssh", 1, AUDIT_USER_LOGOUT);
+ }
+ break;
+
+ case SSH_CONNECTION_ABANDON:
case SSH_INVALID_USER:
- linux_audit_record_event(-1, audit_username(), NULL,
- ssh_remote_ipaddr(ssh), "sshd", 0);
+ linux_audit_user_logxxx(-1, audit_username(),
+ ssh_remote_ipaddr(ssh), "ssh", 0, AUDIT_USER_LOGIN);
break;
default:
debug("%s: unhandled event %d", __func__, event);
break;
}
}
+
+void
+audit_unsupported_body(int what)
+{
+#ifdef AUDIT_CRYPTO_SESSION
+ char buf[AUDIT_LOG_SIZE];
+ const static char *name[] = { "cipher", "mac", "comp" };
+ char *s;
+ int audit_fd;
+
+ snprintf(buf, sizeof(buf), "op=unsupported-%s direction=? cipher=? ksize=? rport=%d laddr=%s lport=%d ",
+ name[what], ssh_remote_port(active_state), (s = get_local_ipaddr(packet_get_connection_in())),
+ ssh_local_port(active_state));
+ free(s);
+ audit_fd = audit_open();
+ if (audit_fd < 0)
+ /* no problem, the next instruction will be fatal() */
+ return;
+ audit_log_user_message(audit_fd, AUDIT_CRYPTO_SESSION,
+ buf, NULL, ssh_remote_ipaddr(active_state), NULL, 0);
+ audit_close(audit_fd);
+#endif
+}
+
+const static char *direction[] = { "from-server", "from-client", "both" };
+
+void
+audit_kex_body(int ctos, char *enc, char *mac, char *compress,
+ char *pfs, pid_t pid, uid_t uid)
+{
+#ifdef AUDIT_CRYPTO_SESSION
+ char buf[AUDIT_LOG_SIZE];
+ int audit_fd, audit_ok;
+ const struct sshcipher *cipher = cipher_by_name(enc);
+ char *s;
+
+ snprintf(buf, sizeof(buf), "op=start direction=%s cipher=%s ksize=%d mac=%s pfs=%s spid=%jd suid=%jd rport=%d laddr=%s lport=%d ",
+ direction[ctos], enc, cipher ? 8 * cipher->key_len : 0, mac, pfs,
+ (intmax_t)pid, (intmax_t)uid,
+ ssh_remote_port(active_state), (s = get_local_ipaddr(packet_get_connection_in())), ssh_local_port(active_state));
+ free(s);
+ audit_fd = audit_open();
+ if (audit_fd < 0) {
+ if (errno == EINVAL || errno == EPROTONOSUPPORT ||
+ errno == EAFNOSUPPORT)
+ return; /* No audit support in kernel */
+ else
+ fatal("cannot open audit"); /* Must prevent login */
+ }
+ audit_ok = audit_log_user_message(audit_fd, AUDIT_CRYPTO_SESSION,
+ buf, NULL, ssh_remote_ipaddr(active_state), NULL, 1);
+ audit_close(audit_fd);
+ /* do not abort if the error is EPERM and sshd is run as non root user */
+ if ((audit_ok < 0) && ((audit_ok != -1) || (getuid() == 0)))
+ fatal("cannot write into audit"); /* Must prevent login */
+#endif
+}
+
+void
+audit_session_key_free_body(int ctos, pid_t pid, uid_t uid)
+{
+ char buf[AUDIT_LOG_SIZE];
+ int audit_fd, audit_ok;
+ char *s;
+
+ snprintf(buf, sizeof(buf), "op=destroy kind=session fp=? direction=%s spid=%jd suid=%jd rport=%d laddr=%s lport=%d ",
+ direction[ctos], (intmax_t)pid, (intmax_t)uid,
+ ssh_remote_port(active_state),
+ (s = get_local_ipaddr(packet_get_connection_in())),
+ ssh_local_port(active_state));
+ free(s);
+ audit_fd = audit_open();
+ if (audit_fd < 0) {
+ if (errno != EINVAL && errno != EPROTONOSUPPORT &&
+ errno != EAFNOSUPPORT)
+ error("cannot open audit");
+ return;
+ }
+ audit_ok = audit_log_user_message(audit_fd, AUDIT_CRYPTO_KEY_USER,
+ buf, NULL, ssh_remote_ipaddr(active_state), NULL, 1);
+ audit_close(audit_fd);
+ /* do not abort if the error is EPERM and sshd is run as non root user */
+ if ((audit_ok < 0) && ((audit_ok != -1) || (getuid() == 0)))
+ error("cannot write into audit");
+}
+
+void
+audit_destroy_sensitive_data(const char *fp, pid_t pid, uid_t uid)
+{
+ char buf[AUDIT_LOG_SIZE];
+ int audit_fd, audit_ok;
+
+ snprintf(buf, sizeof(buf), "op=destroy kind=server fp=%s direction=? spid=%jd suid=%jd ",
+ fp, (intmax_t)pid, (intmax_t)uid);
+ audit_fd = audit_open();
+ if (audit_fd < 0) {
+ if (errno != EINVAL && errno != EPROTONOSUPPORT &&
+ errno != EAFNOSUPPORT)
+ error("cannot open audit");
+ return;
+ }
+ audit_ok = audit_log_user_message(audit_fd, AUDIT_CRYPTO_KEY_USER,
+ buf, NULL,
+ listening_for_clients() ? NULL : ssh_remote_ipaddr(active_state),
+ NULL, 1);
+ audit_close(audit_fd);
+ /* do not abort if the error is EPERM and sshd is run as non root user */
+ if ((audit_ok < 0) && ((audit_ok != -1) || (getuid() == 0)))
+ error("cannot write into audit");
+}
#endif /* USE_LINUX_AUDIT */
diff -up openssh-7.6p1/auditstub.c.audit openssh-7.6p1/auditstub.c
--- openssh-7.6p1/auditstub.c.audit 2017-10-04 17:18:32.835505053 +0200
+++ openssh-7.6p1/auditstub.c 2017-10-04 17:18:32.835505053 +0200
@@ -0,0 +1,50 @@
+/* $Id: auditstub.c,v 1.1 jfch Exp $ */
+
+/*
+ * Copyright 2010 Red Hat, Inc. All rights reserved.
+ * Use is subject to license terms.
+ *
+ * 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.
+ *
+ * Red Hat author: Jan F. Chadima <jchadima@redhat.com>
+ */
+
+#include <sys/types.h>
+
+void
+audit_unsupported(int n)
+{
+}
+
+void
+audit_kex(int ctos, char *enc, char *mac, char *comp, char *pfs)
+{
+}
+
+void
+audit_session_key_free(int ctos)
+{
+}
+
+void
+audit_session_key_free_body(int ctos, pid_t pid, uid_t uid)
+{
+}
diff -up openssh-7.6p1/auth2.c.audit openssh-7.6p1/auth2.c
--- openssh-7.6p1/auth2.c.audit 2017-10-04 17:18:32.746504598 +0200
+++ openssh-7.6p1/auth2.c 2017-10-04 17:18:32.835505053 +0200
@@ -255,9 +255,6 @@ input_userauth_request(int type, u_int32
} else {
/* Invalid user, fake password information */
authctxt->pw = fakepw();
-#ifdef SSH_AUDIT_EVENTS
- PRIVSEP(audit_event(SSH_INVALID_USER));
-#endif
}
#ifdef USE_PAM
if (options.use_pam)
diff -up openssh-7.6p1/auth2-hostbased.c.audit openssh-7.6p1/auth2-hostbased.c
--- openssh-7.6p1/auth2-hostbased.c.audit 2017-10-04 17:18:32.683504276 +0200
+++ openssh-7.6p1/auth2-hostbased.c 2017-10-04 17:18:32.835505053 +0200
@@ -152,7 +152,7 @@ userauth_hostbased(struct ssh *ssh)
/* test for allowed key and correct signature */
authenticated = 0;
if (PRIVSEP(hostbased_key_allowed(authctxt->pw, cuser, chost, key)) &&
- PRIVSEP(sshkey_verify(key, sig, slen,
+ PRIVSEP(hostbased_key_verify(key, sig, slen,
sshbuf_ptr(b), sshbuf_len(b), pkalg, ssh->compat)) == 0)
authenticated = 1;
@@ -169,6 +169,19 @@ done:
return authenticated;
}
+int
+hostbased_key_verify(const struct sshkey *key, const u_char *sig, size_t slen,
+ const u_char *data, size_t datalen, const char *pkalg, u_int compat)
+{
+ int rv;
+
+ rv = sshkey_verify(key, sig, slen, data, datalen, pkalg, compat);
+#ifdef SSH_AUDIT_EVENTS
+ audit_key(0, &rv, key);
+#endif
+ return rv;
+}
+
/* return 1 if given hostkey is allowed */
int
hostbased_key_allowed(struct passwd *pw, const char *cuser, char *chost,
diff -up openssh-7.6p1/auth2-pubkey.c.audit openssh-7.6p1/auth2-pubkey.c
--- openssh-7.6p1/auth2-pubkey.c.audit 2017-10-04 17:18:32.828505018 +0200
+++ openssh-7.6p1/auth2-pubkey.c 2017-10-04 17:18:32.835505053 +0200
@@ -206,7 +206,7 @@ userauth_pubkey(struct ssh *ssh)
/* test for correct signature */
authenticated = 0;
if (PRIVSEP(user_key_allowed(ssh, pw, key, 1, &authopts)) &&
- PRIVSEP(sshkey_verify(key, sig, slen,
+ PRIVSEP(user_key_verify(key, sig, slen,
sshbuf_ptr(b), sshbuf_len(b),
(ssh->compat & SSH_BUG_SIGTYPE) == 0 ? pkalg : NULL,
ssh->compat)) == 0) {
@@ -250,6 +250,19 @@ done:
return authenticated;
}
+int
+user_key_verify(const struct sshkey *key, const u_char *sig, size_t slen,
+ const u_char *data, size_t datalen, const char *pkalg, u_int compat)
+{
+ int rv;
+
+ rv = sshkey_verify(key, sig, slen, data, datalen, pkalg, compat);
+#ifdef SSH_AUDIT_EVENTS
+ audit_key(1, &rv, key);
+#endif
+ return rv;
+}
+
static int
match_principals_option(const char *principal_list, struct sshkey_cert *cert)
{
diff -up openssh-7.6p1/auth.c.audit openssh-7.6p1/auth.c
--- openssh-7.6p1/auth.c.audit 2017-10-04 17:18:32.746504598 +0200
+++ openssh-7.6p1/auth.c 2017-10-04 17:18:32.835505053 +0200
@@ -360,7 +360,7 @@ auth_log(Authctxt *authctxt, int authent
# endif
#endif
#ifdef SSH_AUDIT_EVENTS
- if (authenticated == 0 && !authctxt->postponed)
+ if (authenticated == 0 && !authctxt->postponed && !partial)
audit_event(audit_classify_auth(method));
#endif
}
@@ -599,9 +599,6 @@ getpwnamallow(const char *user)
record_failed_login(user,
auth_get_canonical_hostname(ssh, options.use_dns), "ssh");
#endif
-#ifdef SSH_AUDIT_EVENTS
- audit_event(SSH_INVALID_USER);
-#endif /* SSH_AUDIT_EVENTS */
return (NULL);
}
if (!allowed_user(pw))
diff -up openssh-7.6p1/auth.h.audit openssh-7.6p1/auth.h
--- openssh-7.6p1/auth.h.audit 2017-10-04 17:18:32.768504711 +0200
+++ openssh-7.6p1/auth.h 2017-10-04 17:18:32.836505059 +0200
@@ -198,6 +198,8 @@ struct passwd * getpwnamallow(const char
char *expand_authorized_keys(const char *, struct passwd *pw);
char *authorized_principals_file(struct passwd *);
+int user_key_verify(const struct sshkey *, const u_char *, size_t,
+ const u_char *, size_t, const char *, u_int);
FILE *auth_openkeyfile(const char *, struct passwd *, int);
FILE *auth_openprincipals(const char *, struct passwd *, int);
@@ -217,6 +218,8 @@ struct sshkey *get_hostkey_private_by_ty
int get_hostkey_index(struct sshkey *, int, struct ssh *);
int sshd_hostkey_sign(struct sshkey *, struct sshkey *, u_char **,
size_t *, const u_char *, size_t, const char *, u_int);
+int hostbased_key_verify(const struct sshkey *, const u_char *, size_t,
+ const u_char *, size_t, const char *, u_int);
/* Key / cert options linkage to auth layer */
const struct sshauthopt *auth_options(struct ssh *);
diff -up openssh-7.6p1/cipher.c.audit openssh-7.6p1/cipher.c
--- openssh-7.6p1/cipher.c.audit 2017-10-02 21:34:26.000000000 +0200
+++ openssh-7.6p1/cipher.c 2017-10-04 17:18:32.836505059 +0200
@@ -61,25 +61,6 @@ struct sshcipher_ctx {
const struct sshcipher *cipher;
};
-struct sshcipher {
- char *name;
- u_int block_size;
- u_int key_len;
- u_int iv_len; /* defaults to block_size */
- u_int auth_len;
- u_int flags;
-#define CFLAG_CBC (1<<0)
-#define CFLAG_CHACHAPOLY (1<<1)
-#define CFLAG_AESCTR (1<<2)
-#define CFLAG_NONE (1<<3)
-#define CFLAG_INTERNAL CFLAG_NONE /* Don't use "none" for packets */
-#ifdef WITH_OPENSSL
- const EVP_CIPHER *(*evptype)(void);
-#else
- void *ignored;
-#endif
-};
-
static const struct sshcipher ciphers[] = {
#ifdef WITH_OPENSSL
#ifndef OPENSSL_NO_DES
@@ -409,7 +409,7 @@ cipher_get_length(struct sshcipher_ctx *
void
cipher_free(struct sshcipher_ctx *cc)
{
- if (cc == NULL)
+ if (cc == NULL || cc->cipher == NULL)
return;
if ((cc->cipher->flags & CFLAG_CHACHAPOLY) != 0)
explicit_bzero(&cc->cp_ctx, sizeof(cc->cp_ctx));
diff -up openssh-7.6p1/cipher.h.audit openssh-7.6p1/cipher.h
--- openssh-7.6p1/cipher.h.audit 2017-10-02 21:34:26.000000000 +0200
+++ openssh-7.6p1/cipher.h 2017-10-04 17:18:32.836505059 +0200
@@ -45,7 +45,25 @@
#define CIPHER_ENCRYPT 1
#define CIPHER_DECRYPT 0
-struct sshcipher;
+struct sshcipher {
+ char *name;
+ u_int block_size;
+ u_int key_len;
+ u_int iv_len; /* defaults to block_size */
+ u_int auth_len;
+ u_int flags;
+#define CFLAG_CBC (1<<0)
+#define CFLAG_CHACHAPOLY (1<<1)
+#define CFLAG_AESCTR (1<<2)
+#define CFLAG_NONE (1<<3)
+#define CFLAG_INTERNAL CFLAG_NONE /* Don't use "none" for packets */
+#ifdef WITH_OPENSSL
+ const EVP_CIPHER *(*evptype)(void);
+#else
+ void *ignored;
+#endif
+};
+
struct sshcipher_ctx;
const struct sshcipher *cipher_by_name(const char *);
diff -up openssh-7.6p1/kex.c.audit openssh-7.6p1/kex.c
--- openssh-7.6p1/kex.c.audit 2017-10-04 17:18:32.822504987 +0200
+++ openssh-7.6p1/kex.c 2017-10-04 17:18:32.836505059 +0200
@@ -54,6 +54,7 @@
#include "ssherr.h"
#include "sshbuf.h"
#include "digest.h"
+#include "audit.h"
#ifdef GSSAPI
#include "ssh-gss.h"
@@ -692,8 +693,12 @@ choose_enc(struct sshenc *enc, char *cli
{
char *name = match_list(client, server, NULL);
- if (name == NULL)
+ if (name == NULL) {
+#ifdef SSH_AUDIT_EVENTS
+ audit_unsupported(SSH_AUDIT_UNSUPPORTED_CIPHER);
+#endif
return SSH_ERR_NO_CIPHER_ALG_MATCH;
+ }
if ((enc->cipher = cipher_by_name(name)) == NULL) {
free(name);
return SSH_ERR_INTERNAL_ERROR;
@@ -713,8 +718,12 @@ choose_mac(struct ssh *ssh, struct sshma
{
char *name = match_list(client, server, NULL);
- if (name == NULL)
+ if (name == NULL) {
+#ifdef SSH_AUDIT_EVENTS
+ audit_unsupported(SSH_AUDIT_UNSUPPORTED_MAC);
+#endif
return SSH_ERR_NO_MAC_ALG_MATCH;
+ }
if (mac_setup(mac, name) < 0) {
free(name);
return SSH_ERR_INTERNAL_ERROR;
@@ -733,8 +742,12 @@ choose_comp(struct sshcomp *comp, char *
{
char *name = match_list(client, server, NULL);
- if (name == NULL)
+ if (name == NULL) {
+#ifdef SSH_AUDIT_EVENTS
+ audit_unsupported(SSH_AUDIT_UNSUPPORTED_COMPRESSION);
+#endif
return SSH_ERR_NO_COMPRESS_ALG_MATCH;
+ }
if (strcmp(name, "zlib@openssh.com") == 0) {
comp->type = COMP_DELAYED;
} else if (strcmp(name, "zlib") == 0) {
@@ -904,6 +917,10 @@ kex_choose_conf(struct ssh *ssh)
dh_need = MAXIMUM(dh_need, newkeys->enc.block_size);
dh_need = MAXIMUM(dh_need, newkeys->enc.iv_len);
dh_need = MAXIMUM(dh_need, newkeys->mac.key_len);
+ debug("kex: %s need=%d dh_need=%d", kex->name, need, dh_need);
+#ifdef SSH_AUDIT_EVENTS
+ audit_kex(mode, newkeys->enc.name, newkeys->mac.name, newkeys->comp.name, kex->name);
+#endif
}
/* XXX need runden? */
kex->we_need = need;
@@ -1037,3 +1054,33 @@ dump_digest(char *msg, u_char *digest, i
sshbuf_dump_data(digest, len, stderr);
}
#endif
+
+static void
+enc_destroy(struct sshenc *enc)
+{
+ if (enc == NULL)
+ return;
+
+ if (enc->key) {
+ memset(enc->key, 0, enc->key_len);
+ free(enc->key);
+ }
+
+ if (enc->iv) {
+ memset(enc->iv, 0, enc->iv_len);
+ free(enc->iv);
+ }
+
+ memset(enc, 0, sizeof(*enc));
+}
+
+void
+newkeys_destroy(struct newkeys *newkeys)
+{
+ if (newkeys == NULL)
+ return;
+
+ enc_destroy(&newkeys->enc);
+ mac_destroy(&newkeys->mac);
+ memset(&newkeys->comp, 0, sizeof(newkeys->comp));
+}
diff -up openssh-7.6p1/kex.h.audit openssh-7.6p1/kex.h
--- openssh-7.6p1/kex.h.audit 2017-10-04 17:18:32.822504987 +0200
+++ openssh-7.6p1/kex.h 2017-10-04 17:18:32.836505059 +0200
@@ -219,6 +219,8 @@ int kexgss_client(struct ssh *);
int kexgss_server(struct ssh *);
#endif
+void newkeys_destroy(struct newkeys *newkeys);
+
int kex_dh_hash(int, const char *, const char *,
const u_char *, size_t, const u_char *, size_t, const u_char *, size_t,
const BIGNUM *, const BIGNUM *, const BIGNUM *, u_char *, size_t *);
diff -up openssh-7.6p1/mac.c.audit openssh-7.6p1/mac.c
--- openssh-7.6p1/mac.c.audit 2017-10-02 21:34:26.000000000 +0200
+++ openssh-7.6p1/mac.c 2017-10-04 17:18:32.836505059 +0200
@@ -242,6 +242,20 @@ mac_clear(struct sshmac *mac)
mac->umac_ctx = NULL;
}
+void
+mac_destroy(struct sshmac *mac)
+{
+ if (mac == NULL)
+ return;
+
+ if (mac->key) {
+ memset(mac->key, 0, mac->key_len);
+ free(mac->key);
+ }
+
+ memset(mac, 0, sizeof(*mac));
+}
+
/* XXX copied from ciphers_valid */
#define MAC_SEP ","
int
diff -up openssh-7.6p1/mac.h.audit openssh-7.6p1/mac.h
--- openssh-7.6p1/mac.h.audit 2017-10-02 21:34:26.000000000 +0200
+++ openssh-7.6p1/mac.h 2017-10-04 17:18:32.837505064 +0200
@@ -49,5 +49,6 @@ int mac_compute(struct sshmac *, u_int3
int mac_check(struct sshmac *, u_int32_t, const u_char *, size_t,
const u_char *, size_t);
void mac_clear(struct sshmac *);
+void mac_destroy(struct sshmac *);
#endif /* SSHMAC_H */
diff -up openssh-7.6p1/Makefile.in.audit openssh-7.6p1/Makefile.in
--- openssh-7.6p1/Makefile.in.audit 2017-10-04 17:18:32.749504614 +0200
+++ openssh-7.6p1/Makefile.in 2017-10-04 17:18:32.837505064 +0200
@@ -100,7 +100,8 @@ LIBSSH_OBJS=${LIBOPENSSH_OBJS} \
kex.o kexdh.o kexgex.o kexecdh.o kexc25519.o \
kexdhc.o kexgexc.o kexecdhc.o kexc25519c.o \
kexdhs.o kexgexs.o kexecdhs.o kexc25519s.o \
- platform-pledge.o platform-tracing.o platform-misc.o
+ platform-pledge.o platform-tracing.o platform-misc.o \
+ auditstub.o
SSHOBJS= ssh.o readconf.o clientloop.o sshtty.o \
sshconnect.o sshconnect2.o mux.o
diff -up openssh-7.6p1/monitor.c.audit openssh-7.6p1/monitor.c
--- openssh-7.6p1/monitor.c.audit 2017-10-04 17:18:32.824504997 +0200
+++ openssh-7.6p1/monitor.c 2017-10-04 17:18:32.837505064 +0200
@@ -102,6 +102,7 @@
#include "compat.h"
#include "ssh2.h"
#include "authfd.h"
+#include "audit.h"
#include "match.h"
#include "ssherr.h"
@@ -117,6 +118,8 @@ extern Buffer auth_debug;
extern struct sshbuf *loginmsg;
extern struct sshauthopt *auth_opts; /* XXX move to permanent ssh->authctxt? */
+extern void destroy_sensitive_data(int);
+
/* State exported from the child */
static struct sshbuf *child_state;
@@ -167,6 +170,11 @@ int mm_answer_gss_updatecreds(int, Buffe
#ifdef SSH_AUDIT_EVENTS
int mm_answer_audit_event(int, struct sshbuf *);
int mm_answer_audit_command(int, struct sshbuf *);
+int mm_answer_audit_end_command(int, struct sshbuf *);
+int mm_answer_audit_unsupported_body(int, struct sshbuf *);
+int mm_answer_audit_kex_body(int, struct sshbuf *);
+int mm_answer_audit_session_key_free_body(int, struct sshbuf *);
+int mm_answer_audit_server_key_free(int, struct sshbuf *);
#endif
static int monitor_read_log(struct monitor *);
@@ -222,6 +230,10 @@ struct mon_table mon_dispatch_proto20[]
#endif
#ifdef SSH_AUDIT_EVENTS
{MONITOR_REQ_AUDIT_EVENT, MON_PERMIT, mm_answer_audit_event},
+ {MONITOR_REQ_AUDIT_UNSUPPORTED, MON_PERMIT, mm_answer_audit_unsupported_body},
+ {MONITOR_REQ_AUDIT_KEX, MON_PERMIT, mm_answer_audit_kex_body},
+ {MONITOR_REQ_AUDIT_SESSION_KEY_FREE, MON_PERMIT, mm_answer_audit_session_key_free_body},
+ {MONITOR_REQ_AUDIT_SERVER_KEY_FREE, MON_PERMIT, mm_answer_audit_server_key_free},
#endif
#ifdef BSD_AUTH
{MONITOR_REQ_BSDAUTHQUERY, MON_ISAUTH, mm_answer_bsdauthquery},
@@ -260,6 +272,11 @@ struct mon_table mon_dispatch_postauth20
#ifdef SSH_AUDIT_EVENTS
{MONITOR_REQ_AUDIT_EVENT, MON_PERMIT, mm_answer_audit_event},
{MONITOR_REQ_AUDIT_COMMAND, MON_PERMIT, mm_answer_audit_command},
+ {MONITOR_REQ_AUDIT_END_COMMAND, MON_PERMIT, mm_answer_audit_end_command},
+ {MONITOR_REQ_AUDIT_UNSUPPORTED, MON_PERMIT, mm_answer_audit_unsupported_body},
+ {MONITOR_REQ_AUDIT_KEX, MON_PERMIT, mm_answer_audit_kex_body},
+ {MONITOR_REQ_AUDIT_SESSION_KEY_FREE, MON_PERMIT, mm_answer_audit_session_key_free_body},
+ {MONITOR_REQ_AUDIT_SERVER_KEY_FREE, MON_PERMIT, mm_answer_audit_server_key_free},
#endif
{0, 0, NULL}
};
@@ -1396,8 +1413,10 @@ mm_answer_keyverify(int sock, struct ssh
char *sigalg;
size_t signaturelen, datalen, bloblen;
int r, ret, valid_data = 0, encoded_ret;
+ int type = 0;
- if ((r = sshbuf_get_string(m, &blob, &bloblen)) != 0 ||
+ if ((r = sshbuf_get_u32(m, &type)) != 0 ||
+ (r = sshbuf_get_string(m, &blob, &bloblen)) != 0 ||
(r = sshbuf_get_string(m, &signature, &signaturelen)) != 0 ||
(r = sshbuf_get_string(m, &data, &datalen)) != 0 ||
(r = sshbuf_get_cstring(m, &sigalg, NULL)) != 0)
@@ -1405,6 +1424,8 @@ mm_answer_keyverify(int sock, struct ssh
if (hostbased_cuser == NULL || hostbased_chost == NULL ||
!monitor_allowed_key(blob, bloblen))
fatal("%s: bad key, not previously allowed", __func__);
+ if (type != key_blobtype)
+ fatal("%s: bad key type", __func__);
/* Empty signature algorithm means NULL. */
if (*sigalg == '\0') {
@@ -1414,21 +1435,24 @@ mm_answer_keyverify(int sock, struct ssh
case MM_USERKEY:
valid_data = monitor_valid_userblob(data, datalen);
auth_method = "publickey";
+ ret = user_key_verify(key, signature, signaturelen, data,
+ datalen, sigalg, active_state->compat);
break;
case MM_HOSTKEY:
valid_data = monitor_valid_hostbasedblob(data, datalen,
hostbased_cuser, hostbased_chost);
+ ret = hostbased_key_verify(key, signature, signaturelen, data,
+ datalen, sigalg, active_state->compat);
auth_method = "hostbased";
break;
default:
valid_data = 0;
+ ret = 0;
break;
}
if (!valid_data)
fatal("%s: bad signature data blob", __func__);
- ret = sshkey_verify(key, signature, signaturelen, data, datalen,
- sigalg, active_state->compat);
debug3("%s: %s %p signature %s", __func__, auth_method, key,
(ret == 0) ? "verified" : "unverified");
auth2_record_key(authctxt, ret == 0, key);
@@ -1485,6 +1509,12 @@ mm_session_close(Session *s)
debug3("%s: tty %s ptyfd %d", __func__, s->tty, s->ptyfd);
session_pty_cleanup2(s);
}
+#ifdef SSH_AUDIT_EVENTS
+ if (s->command != NULL) {
+ debug3("%s: command %d", __func__, s->command_handle);
+ session_end_command2(s);
+ }
+#endif
session_unused(s->self);
}
@@ -1588,6 +1618,8 @@ mm_answer_term(int sock, Buffer *req)
sshpam_cleanup();
#endif
+ destroy_sensitive_data(0);
+
while (waitpid(pmonitor->m_pid, &status, 0) == -1)
if (errno != EINTR)
exit(1);
@@ -1630,12 +1662,47 @@ mm_answer_audit_command(int socket, Buff
{
char *cmd;
int r;
+ Session *s;
debug3("%s entering", __func__);
if ((r = sshbuf_get_cstring(m, &cmd, NULL)) != 0)
fatal("%s: buffer error: %s", __func__, ssh_err(r));
+
/* sanity check command, if so how? */
- audit_run_command(cmd);
+ s = session_new();
+ if (s == NULL)
+ fatal("%s: error allocating a session", __func__);
+ s->command = cmd;
+#ifdef SSH_AUDIT_EVENTS
+ s->command_handle = audit_run_command(cmd);
+#endif
+
+ sshbuf_reset(m);
+ sshbuf_put_u32(m, s->self);
+
+ mm_request_send(socket, MONITOR_ANS_AUDIT_COMMAND, m);
+
+ return (0);
+}
+
+int
+mm_answer_audit_end_command(int socket, struct sshbuf *m)
+{
+ int handle, r;
+ size_t len;
+ u_char *cmd = NULL;
+ Session *s;
+
+ debug3("%s entering", __func__);
+ if ((r = sshbuf_get_u32(m, &handle)) != 0 ||
+ (r = sshbuf_get_string(m, &cmd, &len)) != 0)
+ fatal("%s: buffer error: %s", __func__, ssh_err(r));
+
+ s = session_by_id(handle);
+ if (s == NULL || s->ttyfd != -1 || s->command == NULL ||
+ strcmp(s->command, cmd) != 0)
+ fatal("%s: invalid handle", __func__);
+ mm_session_close(s);
free(cmd);
return (0);
}
@@ -1702,6 +1768,7 @@ monitor_apply_keystate(struct monitor *p
void
mm_get_keystate(struct monitor *pmonitor)
{
+ struct sshbuf *m;
debug3("%s: Waiting for new keys", __func__);
if ((child_state = sshbuf_new()) == NULL)
@@ -1709,6 +1776,19 @@ mm_get_keystate(struct monitor *pmonitor
mm_request_receive_expect(pmonitor->m_sendfd, MONITOR_REQ_KEYEXPORT,
child_state);
debug3("%s: GOT new keys", __func__);
+
+#ifdef SSH_AUDIT_EVENTS
+ m = sshbuf_new();
+ mm_request_receive_expect(pmonitor->m_sendfd,
+ MONITOR_REQ_AUDIT_SESSION_KEY_FREE, m);
+ mm_answer_audit_session_key_free_body(pmonitor->m_sendfd, m);
+ sshbuf_free(m);
+#endif
+
+ /* Drain any buffered messages from the child */
+ while (pmonitor->m_log_recvfd >= 0 && monitor_read_log(pmonitor) == 0)
+ ;
+
}
@@ -1976,3 +2056,102 @@ mm_answer_gss_updatecreds(int socket, Bu
#endif /* GSSAPI */
+#ifdef SSH_AUDIT_EVENTS
+int
+mm_answer_audit_unsupported_body(int sock, struct sshbuf *m)
+{
+ int what, r;
+
+ if ((r = sshbuf_get_u32(m, &what)) != 0)
+ fatal("%s: buffer error: %s", __func__, ssh_err(r));
+
+ audit_unsupported_body(what);
+
+ sshbuf_reset(m);
+
+ mm_request_send(sock, MONITOR_ANS_AUDIT_UNSUPPORTED, m);
+ return 0;
+}
+
+int
+mm_answer_audit_kex_body(int sock, struct sshbuf *m)
+{
+ int ctos, r;
+ char *cipher, *mac, *compress, *pfs;
+ u_int64_t tmp;
+ pid_t pid;
+ uid_t uid;
+
+ if ((r = sshbuf_get_u32(m, &ctos)) != 0 ||
+ (r = sshbuf_get_cstring(m, &cipher, NULL)) != 0 ||
+ (r = sshbuf_get_cstring(m, &mac, NULL)) != 0 ||
+ (r = sshbuf_get_cstring(m, &compress, NULL)) != 0 ||
+ (r = sshbuf_get_cstring(m, &pfs, NULL)) != 0 ||
+ (r = sshbuf_get_u64(m, &tmp)) != 0)
+ fatal("%s: buffer error: %s", __func__, ssh_err(r));
+ pid = (pid_t) tmp;
+ if ((r = sshbuf_get_u64(m, &tmp)) != 0)
+ fatal("%s: buffer error: %s", __func__, ssh_err(r));
+ uid = (pid_t) tmp;
+
+ audit_kex_body(ctos, cipher, mac, compress, pfs, pid, uid);
+
+ free(cipher);
+ free(mac);
+ free(compress);
+ free(pfs);
+ sshbuf_reset(m);
+
+ mm_request_send(sock, MONITOR_ANS_AUDIT_KEX, m);
+ return 0;
+}
+
+int
+mm_answer_audit_session_key_free_body(int sock, struct sshbuf *m)
+{
+ int ctos, r;
+ u_int64_t tmp;
+ pid_t pid;
+ uid_t uid;
+
+ if ((r = sshbuf_get_u32(m, &ctos)) != 0 ||
+ (r = sshbuf_get_u64(m, &tmp)) != 0)
+ fatal("%s: buffer error: %s", __func__, ssh_err(r));
+ pid = (pid_t) tmp;
+ if ((r = sshbuf_get_u64(m, &tmp)) != 0)
+ fatal("%s: buffer error: %s", __func__, ssh_err(r));
+ uid = (uid_t) tmp;
+
+ audit_session_key_free_body(ctos, pid, uid);
+
+ sshbuf_reset(m);
+
+ mm_request_send(sock, MONITOR_ANS_AUDIT_SESSION_KEY_FREE, m);
+ return 0;
+}
+
+int
+mm_answer_audit_server_key_free(int sock, struct sshbuf *m)
+{
+ size_t len, r;
+ char *fp;
+ u_int64_t tmp;
+ pid_t pid;
+ uid_t uid;
+
+ if ((r = sshbuf_get_cstring(m, &fp, &len)) != 0 ||
+ (r = sshbuf_get_u64(m, &tmp)) != 0)
+ fatal("%s: buffer error: %s", __func__, ssh_err(r));
+ pid = (pid_t) tmp;
+ if ((r = sshbuf_get_u64(m, &tmp)) != 0)
+ fatal("%s: buffer error: %s", __func__, ssh_err(r));
+ uid = (uid_t) tmp;
+
+ audit_destroy_sensitive_data(fp, pid, uid);
+
+ free(fp);
+ sshbuf_reset(m);
+
+ return 0;
+}
+#endif /* SSH_AUDIT_EVENTS */
diff -up openssh-7.6p1/monitor.h.audit openssh-7.6p1/monitor.h
--- openssh-7.6p1/monitor.h.audit 2017-10-04 17:18:32.781504777 +0200
+++ openssh-7.6p1/monitor.h 2017-10-04 17:18:32.837505064 +0200
@@ -69,7 +69,13 @@ enum monitor_reqtype {
MONITOR_REQ_PAM_QUERY = 106, MONITOR_ANS_PAM_QUERY = 107,
MONITOR_REQ_PAM_RESPOND = 108, MONITOR_ANS_PAM_RESPOND = 109,
MONITOR_REQ_PAM_FREE_CTX = 110, MONITOR_ANS_PAM_FREE_CTX = 111,
- MONITOR_REQ_AUDIT_EVENT = 112, MONITOR_REQ_AUDIT_COMMAND = 113,
+ MONITOR_REQ_AUDIT_EVENT = 112,
+ MONITOR_REQ_AUDIT_COMMAND = 114, MONITOR_ANS_AUDIT_COMMAND = 115,
+ MONITOR_REQ_AUDIT_END_COMMAND = 116,
+ MONITOR_REQ_AUDIT_UNSUPPORTED = 118, MONITOR_ANS_AUDIT_UNSUPPORTED = 119,
+ MONITOR_REQ_AUDIT_KEX = 120, MONITOR_ANS_AUDIT_KEX = 121,
+ MONITOR_REQ_AUDIT_SESSION_KEY_FREE = 122, MONITOR_ANS_AUDIT_SESSION_KEY_FREE = 123,
+ MONITOR_REQ_AUDIT_SERVER_KEY_FREE = 124
};
diff -up openssh-7.6p1/monitor_wrap.c.audit openssh-7.6p1/monitor_wrap.c
--- openssh-7.6p1/monitor_wrap.c.audit 2017-10-04 17:18:32.750504619 +0200
+++ openssh-7.6p1/monitor_wrap.c 2017-10-04 17:18:32.838505069 +0200
@@ -463,7 +463,7 @@ mm_key_allowed(enum mm_keytype type, con
*/
int
-mm_sshkey_verify(const struct sshkey *key, const u_char *sig, size_t siglen,
+mm_sshkey_verify(enum mm_keytype type, const struct sshkey *key, const u_char *sig, size_t siglen,
const u_char *data, size_t datalen, const char *sigalg, u_int compat)
{
struct sshbuf *m;
@@ -478,7 +478,8 @@ mm_sshkey_verify(const struct sshkey *ke
if ((m = sshbuf_new()) == NULL)
fatal("%s: sshbuf_new failed", __func__);
- if ((r = sshkey_puts(key, m)) != 0 ||
+ if ((r = sshbuf_put_u32(m, type)) != 0 ||
+ (r = sshkey_puts(key, m)) != 0 ||
(r = sshbuf_put_string(m, sig, siglen)) != 0 ||
(r = sshbuf_put_string(m, data, datalen)) != 0 ||
(r = sshbuf_put_cstring(m, sigalg == NULL ? "" : sigalg)) != 0)
@@ -497,6 +498,20 @@ mm_sshkey_verify(const struct sshkey *ke
return 0;
}
+int
+mm_hostbased_key_verify(const struct sshkey *key, const u_char *sig, size_t siglen,
+ const u_char *data, size_t datalen, const char *pkalg, u_int compat)
+{
+ return mm_sshkey_verify(MM_HOSTKEY, key, sig, siglen, data, datalen, pkalg, compat);
+}
+
+int
+mm_user_key_verify(const struct sshkey *key, const u_char *sig, size_t siglen,
+ const u_char *data, size_t datalen, const char *pkalg, u_int compat)
+{
+ return mm_sshkey_verify(MM_USERKEY, key, sig, siglen, data, datalen, pkalg, compat);
+}
+
void
mm_send_keystate(struct monitor *monitor)
{
@@ -874,11 +889,12 @@ mm_audit_event(ssh_audit_event_t event)
sshbuf_free(m);
}
-void
+int
mm_audit_run_command(const char *command)
{
struct sshbuf *m;
int r;
+ int handle;
debug3("%s entering command %s", __func__, command);
@@ -885,6 +901,30 @@ mm_audit_run_command(const char *command
fatal("%s: buffer error: %s", __func__, ssh_err(r));
mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_AUDIT_COMMAND, m);
+ mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_AUDIT_COMMAND, m);
+
+ if ((r = sshbuf_get_u32(m, &handle)) != 0)
+ fatal("%s: buffer error: %s", __func__, ssh_err(r));
+ sshbuf_free(m);
+
+ return (handle);
+}
+
+void
+mm_audit_end_command(int handle, const char *command)
+{
+ int r;
+ struct sshbuf *m;
+
+ debug3("%s entering command %s", __func__, command);
+
+ if ((m = sshbuf_new()) == NULL)
+ fatal("%s: sshbuf_new failed", __func__);
+ if ((r = sshbuf_put_u32(m, handle)) != 0 ||
+ (r = sshbuf_put_cstring(m, command)) != 0)
+ fatal("%s: buffer error: %s", __func__, ssh_err(r));
+
+ mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_AUDIT_END_COMMAND, m);
sshbuf_free(m);
}
#endif /* SSH_AUDIT_EVENTS */
@@ -1020,3 +1056,83 @@ mm_ssh_gssapi_update_creds(ssh_gssapi_cc
return (ok);
}
#endif /* GSSAPI */
+#ifdef SSH_AUDIT_EVENTS
+void
+mm_audit_unsupported_body(int what)
+{
+ int r;
+ struct sshbuf *m;
+
+ if ((m = sshbuf_new()) == NULL)
+ fatal("%s: sshbuf_new failed", __func__);
+ if ((r = sshbuf_put_u32(m, what)) != 0)
+ fatal("%s: buffer error: %s", __func__, ssh_err(r));
+
+ mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_AUDIT_UNSUPPORTED, m);
+ mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_AUDIT_UNSUPPORTED,
+ m);
+
+ sshbuf_free(m);
+}
+
+void
+mm_audit_kex_body(int ctos, char *cipher, char *mac, char *compress, char *fps, pid_t pid,
+ uid_t uid)
+{
+ int r;
+ struct sshbuf *m;
+
+ if ((m = sshbuf_new()) == NULL)
+ fatal("%s: sshbuf_new failed", __func__);
+ if ((r = sshbuf_put_u32(m, ctos)) != 0 ||
+ (r = sshbuf_put_cstring(m, cipher)) != 0 ||
+ (r = sshbuf_put_cstring(m, (mac ? mac : "<implicit>"))) != 0 ||
+ (r = sshbuf_put_cstring(m, compress)) != 0 ||
+ (r = sshbuf_put_cstring(m, fps)) != 0 ||
+ (r = sshbuf_put_u64(m, pid)) != 0 ||
+ (r = sshbuf_put_u64(m, uid)) != 0)
+ fatal("%s: buffer error: %s", __func__, ssh_err(r));
+
+ mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_AUDIT_KEX, m);
+ mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_AUDIT_KEX,
+ m);
+
+ sshbuf_free(m);
+}
+
+void
+mm_audit_session_key_free_body(int ctos, pid_t pid, uid_t uid)
+{
+ int r;
+ struct sshbuf *m;
+
+ if ((m = sshbuf_new()) == NULL)
+ fatal("%s: sshbuf_new failed", __func__);
+ if ((r = sshbuf_put_u32(m, ctos)) != 0 ||
+ (r = sshbuf_put_u64(m, pid)) != 0 ||
+ (r = sshbuf_put_u64(m, uid)) != 0)
+ fatal("%s: buffer error: %s", __func__, ssh_err(r));
+
+ mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_AUDIT_SESSION_KEY_FREE, m);
+ mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_AUDIT_SESSION_KEY_FREE,
+ m);
+ sshbuf_free(m);
+}
+
+void
+mm_audit_destroy_sensitive_data(const char *fp, pid_t pid, uid_t uid)
+{
+ int r;
+ struct sshbuf *m;
+
+ if ((m = sshbuf_new()) == NULL)
+ fatal("%s: sshbuf_new failed", __func__);
+ if ((r = sshbuf_put_cstring(m, fp)) != 0 ||
+ (r = sshbuf_put_u64(m, pid)) != 0 ||
+ (r = sshbuf_put_u64(m, uid)) != 0)
+ fatal("%s: buffer error: %s", __func__, ssh_err(r));
+
+ mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_AUDIT_SERVER_KEY_FREE, m);
+ sshbuf_free(m);
+}
+#endif /* SSH_AUDIT_EVENTS */
diff -up openssh-7.6p1/monitor_wrap.h.audit openssh-7.6p1/monitor_wrap.h
--- openssh-7.6p1/monitor_wrap.h.audit 2017-10-04 17:18:32.750504619 +0200
+++ openssh-7.6p1/monitor_wrap.h 2017-10-04 17:18:32.838505069 +0200
@@ -53,7 +53,9 @@ int mm_key_allowed(enum mm_keytype, cons
struct sshauthopt **);
int mm_hostbased_key_allowed(struct passwd *, const char *,
const char *, struct sshkey *);
-int mm_sshkey_verify(const struct sshkey *, const u_char *, size_t,
+int mm_hostbased_key_verify(const struct sshkey *, const u_char *, size_t,
+ const u_char *, size_t, const char *, u_int);
+int mm_user_key_verify(const struct sshkey *, const u_char *, size_t,
const u_char *, size_t, const char *, u_int);
#ifdef GSSAPI
@@ -78,7 +80,12 @@ void mm_sshpam_free_ctx(void *);
#ifdef SSH_AUDIT_EVENTS
#include "audit.h"
void mm_audit_event(ssh_audit_event_t);
-void mm_audit_run_command(const char *);
+int mm_audit_run_command(const char *);
+void mm_audit_end_command(int, const char *);
+void mm_audit_unsupported_body(int);
+void mm_audit_kex_body(int, char *, char *, char *, char *, pid_t, uid_t);
+void mm_audit_session_key_free_body(int, pid_t, uid_t);
+void mm_audit_destroy_sensitive_data(const char *, pid_t, uid_t);
#endif
struct Session;
diff -up openssh-7.6p1/packet.c.audit openssh-7.6p1/packet.c
--- openssh-7.6p1/packet.c.audit 2017-10-04 17:18:32.672504220 +0200
+++ openssh-7.6p1/packet.c 2017-10-04 17:25:48.141741390 +0200
@@ -67,6 +67,7 @@
#include <zlib.h>
#include "xmalloc.h"
+#include "audit.h"
#include "crc32.h"
#include "compat.h"
#include "ssh2.h"
@@ -502,6 +503,13 @@ ssh_packet_get_connection_out(struct ssh
return ssh->state->connection_out;
}
+static int
+packet_state_has_keys (const struct session_state *state)
+{
+ return state != NULL &&
+ (state->newkeys[MODE_IN] != NULL || state->newkeys[MODE_OUT] != NULL);
+}
+
/*
* Returns the IP-address of the remote host as a string. The returned
* string must not be freed.
@@ -566,22 +574,19 @@ ssh_packet_close_internal(struct ssh *ss
{
struct session_state *state = ssh->state;
u_int mode;
+ u_int had_keys = packet_state_has_keys(state);
if (!state->initialized)
return;
state->initialized = 0;
- if (do_close) {
- if (state->connection_in == state->connection_out) {
- close(state->connection_out);
- } else {
- close(state->connection_in);
- close(state->connection_out);
- }
- }
sshbuf_free(state->input);
+ state->input = NULL;
sshbuf_free(state->output);
+ state->output = NULL;
sshbuf_free(state->outgoing_packet);
+ state->outgoing_packet = NULL;
sshbuf_free(state->incoming_packet);
+ state->incoming_packet = NULL;
for (mode = 0; mode < MODE_MAX; mode++) {
kex_free_newkeys(state->newkeys[mode]); /* current keys */
state->newkeys[mode] = NULL;
@@ -615,8 +616,18 @@ ssh_packet_close_internal(struct ssh *ss
}
cipher_free(state->send_context);
cipher_free(state->receive_context);
+ if (had_keys && state->server_side) {
+ /* Assuming this is called only from privsep child */
+ audit_session_key_free(MODE_MAX);
+ }
state->send_context = state->receive_context = NULL;
if (do_close) {
+ if (state->connection_in == state->connection_out) {
+ close(state->connection_out);
+ } else {
+ close(state->connection_in);
+ close(state->connection_out);
+ }
free(ssh->local_ipaddr);
ssh->local_ipaddr = NULL;
free(ssh->remote_ipaddr);
@@ -854,6 +863,7 @@ ssh_set_newkeys(struct ssh *ssh, int mod
(unsigned long long)state->p_read.blocks,
(unsigned long long)state->p_send.bytes,
(unsigned long long)state->p_send.blocks);
+ audit_session_key_free(mode);
cipher_free(*ccp);
*ccp = NULL;
kex_free_newkeys(state->newkeys[mode]);
@@ -2135,6 +2145,72 @@ ssh_packet_get_output(struct ssh *ssh)
return (void *)ssh->state->output;
}
+static void
+newkeys_destroy_and_free(struct newkeys *newkeys)
+{
+ if (newkeys == NULL)
+ return;
+
+ free(newkeys->enc.name);
+
+ if (newkeys->mac.enabled) {
+ mac_clear(&newkeys->mac);
+ free(newkeys->mac.name);
+ }
+
+ free(newkeys->comp.name);
+
+ newkeys_destroy(newkeys);
+ free(newkeys);
+}
+
+static void
+packet_destroy_state(struct session_state *state)
+{
+ if (state == NULL)
+ return;
+
+ cipher_free(state->receive_context);
+ cipher_free(state->send_context);
+
+ sshbuf_free(state->input);
+ state->input = NULL;
+ sshbuf_free(state->output);
+ state->output = NULL;
+ sshbuf_free(state->outgoing_packet);
+ state->outgoing_packet = NULL;
+ sshbuf_free(state->incoming_packet);
+ state->incoming_packet = NULL;
+ if (state->compression_buffer) {
+ sshbuf_free(state->compression_buffer);
+ state->compression_buffer = NULL;
+ }
+ newkeys_destroy_and_free(state->newkeys[MODE_IN]);
+ state->newkeys[MODE_IN] = NULL;
+ newkeys_destroy_and_free(state->newkeys[MODE_OUT]);
+ state->newkeys[MODE_OUT] = NULL;
+ mac_destroy(state->packet_discard_mac);
+// TAILQ_HEAD(, packet) outgoing;
+// memset(state, 0, sizeof(state));
+}
+
+void
+packet_destroy_all(int audit_it, int privsep)
+{
+ if (audit_it)
+ audit_it = (active_state != NULL && packet_state_has_keys(active_state->state));
+ if (active_state != NULL)
+ packet_destroy_state(active_state->state);
+ if (audit_it) {
+#ifdef SSH_AUDIT_EVENTS
+ if (privsep)
+ audit_session_key_free(MODE_MAX);
+ else
+ audit_session_key_free_body(MODE_MAX, getpid(), getuid());
+#endif
+ }
+}
+
/* Reset after_authentication and reset compression in post-auth privsep */
static int
ssh_packet_set_postauth(struct ssh *ssh)
diff -up openssh-7.6p1/packet.h.audit openssh-7.6p1/packet.h
--- openssh-7.6p1/packet.h.audit 2017-10-02 21:34:26.000000000 +0200
+++ openssh-7.6p1/packet.h 2017-10-04 17:18:32.838505069 +0200
@@ -217,4 +217,5 @@ extern struct ssh *active_state;
# undef EC_POINT
#endif
+void packet_destroy_all(int, int);
#endif /* PACKET_H */
diff -up openssh-7.6p1/session.c.audit openssh-7.6p1/session.c
--- openssh-7.6p1/session.c.audit 2017-10-04 17:18:32.812504936 +0200
+++ openssh-7.6p1/session.c 2017-10-04 17:18:32.839505074 +0200
@@ -138,7 +138,7 @@ extern char *__progname;
extern int debug_flag;
extern u_int utmp_len;
extern int startup_pipe;
-extern void destroy_sensitive_data(void);
+extern void destroy_sensitive_data(int);
extern struct sshbuf *loginmsg;
extern struct sshauthopt *auth_opts;
char *tun_fwd_ifnames; /* serverloop.c */
@@ -605,6 +605,14 @@ do_exec_pty(struct ssh *ssh, Session *s,
/* Parent. Close the slave side of the pseudo tty. */
close(ttyfd);
+#if !defined(HAVE_OSF_SIA) && defined(SSH_AUDIT_EVENTS)
+ /* do_login in the child did not affect state in this process,
+ compensate. From an architectural standpoint, this is extremely
+ ugly. */
+ if (command != NULL)
+ audit_count_session_open();
+#endif
+
/* Enter interactive session. */
s->ptymaster = ptymaster;
packet_set_interactive(1,
@@ -724,15 +732,19 @@ do_exec(struct ssh *ssh, Session *s, con
s->self);
#ifdef SSH_AUDIT_EVENTS
+ if (s->command != NULL || s->command_handle != -1)
+ fatal("do_exec: command already set");
if (command != NULL)
- PRIVSEP(audit_run_command(command));
+ s->command = xstrdup(command);
else if (s->ttyfd == -1) {
char *shell = s->pw->pw_shell;
if (shell[0] == '\0') /* empty shell means /bin/sh */
shell =_PATH_BSHELL;
- PRIVSEP(audit_run_command(shell));
+ s->command = xstrdup(shell);
}
+ if (s->command != NULL && s->ptyfd == -1)
+ s->command_handle = PRIVSEP(audit_run_command(s->command));
#endif
if (s->ttyfd != -1)
ret = do_exec_pty(ssh, s, command);
@@ -1499,8 +1511,11 @@ do_child(struct ssh *ssh, Session *s, co
}
/* remove hostkey from the child's memory */
- destroy_sensitive_data();
+ destroy_sensitive_data(1);
packet_clear_keys();
+ /* Don't audit this - both us and the parent would be talking to the
+ monitor over a single socket, with no synchronization. */
+ packet_destroy_all(0, 1);
/* Force a password change */
if (s->authctxt->force_pwchange) {
@@ -1714,6 +1729,9 @@ session_unused(int id)
sessions[id].ttyfd = -1;
sessions[id].ptymaster = -1;
sessions[id].x11_chanids = NULL;
+#ifdef SSH_AUDIT_EVENTS
+ sessions[id].command_handle = -1;
+#endif
sessions[id].next_unused = sessions_first_unused;
sessions_first_unused = id;
}
@@ -1796,6 +1814,19 @@ session_open(Authctxt *authctxt, int cha
}
Session *
+session_by_id(int id)
+{
+ if (id >= 0 && id < sessions_nalloc) {
+ Session *s = &sessions[id];
+ if (s->used)
+ return s;
+ }
+ debug("%s: unknown id %d", __func__, id);
+ session_dump();
+ return NULL;
+}
+
+Session *
session_by_tty(char *tty)
{
int i;
@@ -2307,6 +2338,32 @@ session_exit_message(struct ssh *ssh, Se
chan_write_failed(ssh, c);
}
+#ifdef SSH_AUDIT_EVENTS
+void
+session_end_command2(Session *s)
+{
+ if (s->command != NULL) {
+ if (s->command_handle != -1)
+ audit_end_command(s->command_handle, s->command);
+ free(s->command);
+ s->command = NULL;
+ s->command_handle = -1;
+ }
+}
+
+static void
+session_end_command(Session *s)
+{
+ if (s->command != NULL) {
+ if (s->command_handle != -1)
+ PRIVSEP(audit_end_command(s->command_handle, s->command));
+ free(s->command);
+ s->command = NULL;
+ s->command_handle = -1;
+ }
+}
+#endif
+
void
session_close(struct ssh *ssh, Session *s)
{
@@ -2320,6 +2377,10 @@ session_close(struct ssh *ssh, Session *
if (s->ttyfd != -1)
session_pty_cleanup(s);
+#ifdef SSH_AUDIT_EVENTS
+ if (s->command)
+ session_end_command(s);
+#endif
free(s->term);
free(s->display);
free(s->x11_chanids);
@@ -2528,6 +2589,15 @@ do_authenticated2(struct ssh *ssh, Authc
server_loop2(ssh, authctxt);
}
+static void
+do_cleanup_one_session(Session *s)
+{
+ session_pty_cleanup2(s);
+#ifdef SSH_AUDIT_EVENTS
+ session_end_command2(s);
+#endif
+}
+
void
do_cleanup(struct ssh *ssh, Authctxt *authctxt)
{
@@ -2585,7 +2655,7 @@ do_cleanup(struct ssh *ssh, Authctxt *au
* or if running in monitor.
*/
if (!use_privsep || mm_is_monitor())
- session_destroy_all(ssh, session_pty_cleanup2);
+ session_destroy_all(ssh, do_cleanup_one_session);
}
/* Return a name for the remote host that fits inside utmp_size */
diff -up openssh-7.6p1/session.h.audit openssh-7.6p1/session.h
--- openssh-7.6p1/session.h.audit 2017-10-02 21:34:26.000000000 +0200
+++ openssh-7.6p1/session.h 2017-10-04 17:18:32.839505074 +0200
@@ -60,6 +60,12 @@ struct Session {
char *name;
char *val;
} *env;
+
+ /* exec */
+#ifdef SSH_AUDIT_EVENTS
+ int command_handle;
+ char *command;
+#endif
};
void do_authenticated(struct ssh *, Authctxt *);
@@ -72,8 +78,10 @@ void session_close_by_pid(struct ssh *s
void session_close_by_channel(struct ssh *, int, void *);
void session_destroy_all(struct ssh *, void (*)(Session *));
void session_pty_cleanup2(Session *);
+void session_end_command2(Session *);
Session *session_new(void);
+Session *session_by_id(int);
Session *session_by_tty(char *);
void session_close(struct ssh *, Session *);
void do_setusercontext(struct passwd *);
diff -up openssh-7.6p1/sshd.c.audit openssh-7.6p1/sshd.c
--- openssh-7.6p1/sshd.c.audit 2017-10-04 17:18:32.830505028 +0200
+++ openssh-7.6p1/sshd.c 2017-10-04 17:18:32.839505074 +0200
@@ -122,6 +122,7 @@
#include "ssh-gss.h"
#endif
#include "monitor_wrap.h"
+#include "audit.h"
#include "ssh-sandbox.h"
#include "auth-options.h"
#include "version.h"
@@ -248,7 +249,7 @@ Buffer loginmsg;
struct passwd *privsep_pw = NULL;
/* Prototypes for various functions defined later in this file. */
-void destroy_sensitive_data(void);
+void destroy_sensitive_data(int);
void demote_sensitive_data(void);
static void do_ssh2_kex(void);
@@ -265,6 +266,15 @@ close_listen_socks(void)
num_listen_socks = -1;
}
+/*
+ * Is this process listening for clients (i.e. not specific to any specific
+ * client connection?)
+ */
+int listening_for_clients(void)
+{
+ return num_listen_socks >= 0;
+}
+
static void
close_startup_pipes(void)
{
@@ -475,18 +485,45 @@ sshd_exchange_identification(struct ssh
}
}
-/* Destroy the host and server keys. They will no longer be needed. */
+/*
+ * Destroy the host and server keys. They will no longer be needed. Careful,
+ * this can be called from cleanup_exit() - i.e. from just about anywhere.
+ */
void
-destroy_sensitive_data(void)
+destroy_sensitive_data(int privsep)
{
u_int i;
+#ifdef SSH_AUDIT_EVENTS
+ pid_t pid;
+ uid_t uid;
+ pid = getpid();
+ uid = getuid();
+#endif
for (i = 0; i < options.num_host_key_files; i++) {
if (sensitive_data.host_keys[i]) {
+ char *fp;
+
+ if (sshkey_is_private(sensitive_data.host_keys[i]))
+ fp = sshkey_fingerprint(sensitive_data.host_keys[i], options.fingerprint_hash, SSH_FP_HEX);
+ else
+ fp = NULL;
sshkey_free(sensitive_data.host_keys[i]);
sensitive_data.host_keys[i] = NULL;
+ if (fp != NULL) {
+#ifdef SSH_AUDIT_EVENTS
+ if (privsep)
+ PRIVSEP(audit_destroy_sensitive_data(fp,
+ pid, uid));
+ else
+ audit_destroy_sensitive_data(fp,
+ pid, uid);
+#endif
+ free(fp);
+ }
}
- if (sensitive_data.host_certificates[i]) {
+ if (sensitive_data.host_certificates
+ && sensitive_data.host_certificates[i]) {
sshkey_free(sensitive_data.host_certificates[i]);
sensitive_data.host_certificates[i] = NULL;
}
@@ -499,16 +536,34 @@ demote_sensitive_data(void)
struct sshkey *tmp;
u_int i;
int r;
+#ifdef SSH_AUDIT_EVENTS
+ pid_t pid;
+ uid_t uid;
+ pid = getpid();
+ uid = getuid();
+#endif
for (i = 0; i < options.num_host_key_files; i++) {
if (sensitive_data.host_keys[i]) {
+ char *fp;
+
+ if (sshkey_is_private(sensitive_data.host_keys[i]))
+ fp = sshkey_fingerprint(sensitive_data.host_keys[i], options.fingerprint_hash, SSH_FP_HEX);
+ else
+ fp = NULL;
if ((r = sshkey_from_private(
sensitive_data.host_keys[i], &tmp)) != 0)
fatal("could not demote host %s key: %s",
sshkey_type(sensitive_data.host_keys[i]),
ssh_err(r));
sshkey_free(sensitive_data.host_keys[i]);
sensitive_data.host_keys[i] = tmp;
+ if (fp != NULL) {
+#ifdef SSH_AUDIT_EVENTS
+ audit_destroy_sensitive_data(fp, pid, uid);
+#endif
+ free(fp);
+ }
}
/* Certs do not need demotion */
}
@@ -587,7 +642,7 @@ privsep_preauth(Authctxt *authctxt)
if (use_privsep == PRIVSEP_ON)
box = ssh_sandbox_init(pmonitor);
- pid = fork();
+ pmonitor->m_pid = pid = fork();
if (pid == -1) {
fatal("fork of unprivileged child failed");
} else if (pid != 0) {
@@ -1162,6 +1217,7 @@ server_accept_loop(int *sock_in, int *so
if (received_sigterm) {
logit("Received signal %d; terminating.",
(int) received_sigterm);
+ destroy_sensitive_data(0);
close_listen_socks();
if (options.pid_file != NULL)
unlink(options.pid_file);
@@ -2165,6 +2221,9 @@ main(int ac, char **av)
do_authenticated(ssh, authctxt);
/* The connection has been terminated. */
+ packet_destroy_all(1, 1);
+ destroy_sensitive_data(1);
+
packet_get_bytes(&ibytes, &obytes);
verbose("Transferred: sent %llu, received %llu bytes",
(unsigned long long)obytes, (unsigned long long)ibytes);
@@ -2344,6 +2403,15 @@ void
cleanup_exit(int i)
{
struct ssh *ssh = active_state; /* XXX */
+ static int in_cleanup = 0;
+ int is_privsep_child;
+
+ /* cleanup_exit can be called at the very least from the privsep
+ wrappers used for auditing. Make sure we don't recurse
+ indefinitely. */
+ if (in_cleanup)
+ _exit(i);
+ in_cleanup = 1;
if (the_authctxt) {
do_cleanup(ssh, the_authctxt);
@@ -2356,9 +2424,14 @@ cleanup_exit(int i)
pmonitor->m_pid, strerror(errno));
}
}
+ is_privsep_child = use_privsep && pmonitor != NULL && pmonitor->m_pid == 0;
+ if (sensitive_data.host_keys != NULL)
+ destroy_sensitive_data(is_privsep_child);
+ packet_destroy_all(1, is_privsep_child);
#ifdef SSH_AUDIT_EVENTS
/* done after do_cleanup so it can cancel the PAM auth 'thread' */
- if (!use_privsep || mm_is_monitor())
+ if ((the_authctxt == NULL || !the_authctxt->authenticated) &&
+ (!use_privsep || mm_is_monitor()))
audit_event(SSH_CONNECTION_ABANDON);
#endif
_exit(i);
diff -up openssh-7.6p1/sshkey.c.audit openssh-7.6p1/sshkey.c
--- openssh-7.6p1/sshkey.c.audit 2017-10-04 17:18:32.758504660 +0200
+++ openssh-7.6p1/sshkey.c 2017-10-04 17:18:32.839505074 +0200
@@ -295,6 +295,38 @@ sshkey_type_is_valid_ca(int type)
}
int
+sshkey_is_private(const struct sshkey *k)
+{
+ switch (k->type) {
+#ifdef WITH_OPENSSL
+ case KEY_RSA_CERT:
+ case KEY_RSA: {
+ const BIGNUM *d;
+ RSA_get0_key(k->rsa, NULL, NULL, &d);
+ return d != NULL;
+ }
+ case KEY_DSA_CERT:
+ case KEY_DSA: {
+ const BIGNUM *priv_key;
+ DSA_get0_key(k->dsa, NULL, &priv_key);
+ return priv_key != NULL;
+ }
+#ifdef OPENSSL_HAS_ECC
+ case KEY_ECDSA_CERT:
+ case KEY_ECDSA:
+ return EC_KEY_get0_private_key(k->ecdsa) != NULL;
+#endif /* OPENSSL_HAS_ECC */
+#endif /* WITH_OPENSSL */
+ case KEY_ED25519_CERT:
+ case KEY_ED25519:
+ return (k->ed25519_pk != NULL);
+ default:
+ /* fatal("key_is_private: bad key type %d", k->type); */
+ return 0;
+ }
+}
+
+int
sshkey_is_cert(const struct sshkey *k)
{
if (k == NULL)
diff -up openssh-7.6p1/sshkey.h.audit openssh-7.6p1/sshkey.h
--- openssh-7.6p1/sshkey.h.audit 2017-10-04 17:18:32.758504660 +0200
+++ openssh-7.6p1/sshkey.h 2017-10-04 17:18:32.840505079 +0200
@@ -133,6 +133,7 @@ u_int sshkey_size(const struct sshkey
int sshkey_generate(int type, u_int bits, struct sshkey **keyp);
int sshkey_from_private(const struct sshkey *, struct sshkey **);
int sshkey_type_from_name(const char *);
+int sshkey_is_private(const struct sshkey *);
int sshkey_is_cert(const struct sshkey *);
int sshkey_type_is_cert(int);
int sshkey_type_plain(int);