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openssh/openssh-8.1p1-audit.patch
Dirk Mueller 0957114f91 Accepting request 960041 from home:hpjansson:openssh-tw 
- Version update to 8.9p1:
  = Security
  * sshd(8): fix an integer overflow in the user authentication path
    that, in conjunction with other logic errors, could have yielded
    unauthenticated access under difficult to exploit conditions.
    This situation is not exploitable because of independent checks in
    the privilege separation monitor. Privilege separation has been
    enabled by default in since openssh-3.2.2 (released in 2002) and
    has been mandatory since openssh-7.5 (released in 2017). Moreover,
    portable OpenSSH has used toolchain features available in most
    modern compilers to abort on signed integer overflow since
    openssh-6.5 (released in 2014).
    Thanks to Malcolm Stagg for finding and reporting this bug.
  = Potentially-incompatible changes
  * sshd(8), portable OpenSSH only: this release removes in-built
    support for MD5-hashed passwords. If you require these on your
    system then we recommend linking against libxcrypt or similar.
  * This release modifies the FIDO security key middleware interface
    and increments SSH_SK_VERSION_MAJOR.
  = New features
  * ssh(1), sshd(8), ssh-add(1), ssh-agent(1): add a system for
    restricting forwarding and use of keys added to ssh-agent(1)
    A detailed description of the feature is available at
    https://www.openssh.com/agent-restrict.html and the protocol
    extensions are documented in the PROTOCOL and PROTOCOL.agent
    files in the source release.
  * ssh(1), sshd(8): add the sntrup761x25519-sha512@openssh.com hybrid
    ECDH/x25519 + Streamlined NTRU Prime post-quantum KEX to the
    default KEXAlgorithms list (after the ECDH methods but before the
    prime-group DH ones). The next release of OpenSSH is likely to
    make this key exchange the default method.
  * ssh-keygen(1): when downloading resident keys from a FIDO token,
    pass back the user ID that was used when the key was created and
    append it to the filename the key is written to (if it is not the
    default). Avoids keys being clobbered if the user created multiple
    resident keys with the same application string but different user
    IDs.
  * ssh-keygen(1), ssh(1), ssh-agent(1): better handling for FIDO keys
    on tokens that provide user verification (UV) on the device itself,
    including biometric keys, avoiding unnecessary PIN prompts.
  * ssh-keygen(1): add "ssh-keygen -Y match-principals" operation to
    perform matching of principals names against an allowed signers
    file. To be used towards a TOFU model for SSH signatures in git.
  * ssh-add(1), ssh-agent(1): allow pin-required FIDO keys to be added
    to ssh-agent(1). $SSH_ASKPASS will be used to request the PIN at
    authentication time.
  * ssh-keygen(1): allow selection of hash at sshsig signing time
    (either sha512 (default) or sha256).
  * ssh(1), sshd(8): read network data directly to the packet input
    buffer instead of indirectly via a small stack buffer. Provides a
    modest performance improvement.
  * ssh(1), sshd(8): read data directly to the channel input buffer,
    providing a similar modest performance improvement.
  * ssh(1): extend the PubkeyAuthentication configuration directive to
    accept yes|no|unbound|host-bound to allow control over one of the
    protocol extensions used to implement agent-restricted keys.
  = Bugfixes
  * sshd(8): document that CASignatureAlgorithms, ExposeAuthInfo and
    PubkeyAuthOptions can be used in a Match block. PR277.
  * sshd(8): fix possible string truncation when constructing paths to
    .rhosts/.shosts files with very long user home directory names.
  * ssh-keysign(1): unbreak for KEX algorithms that use SHA384/512
    exchange hashes
  * ssh(1): don't put the TTY into raw mode when SessionType=none,
    avoids ^C being unable to kill such a session. bz3360
  * scp(1): fix some corner-case bugs in SFTP-mode handling of
    ~-prefixed paths.
  * ssh(1): unbreak hostbased auth using RSA keys. Allow ssh(1) to
    select RSA keys when only RSA/SHA2 signature algorithms are
    configured (this is the default case). Previously RSA keys were
    not being considered in the default case.
  * ssh-keysign(1): make ssh-keysign use the requested signature
    algorithm and not the default for the key type. Part of unbreaking
    hostbased auth for RSA/SHA2 keys.
  * ssh(1): stricter UpdateHostkey signature verification logic on
    the client- side. Require RSA/SHA2 signatures for RSA hostkeys
    except when RSA/SHA1 was explicitly negotiated during initial
    KEX; bz3375
  * ssh(1), sshd(8): fix signature algorithm selection logic for
    UpdateHostkeys on the server side. The previous code tried to
    prefer RSA/SHA2 for hostkey proofs of RSA keys, but missed some
    cases. This will use RSA/SHA2 signatures for RSA keys if the
    client proposed these algorithms in initial KEX. bz3375
  * All: convert all uses of select(2)/pselect(2) to poll(2)/ppoll(2).
    This includes the mainloops in ssh(1), ssh-agent(1), ssh-agent(1)
    and sftp-server(8), as well as the sshd(8) listen loop and all
    other FD read/writability checks. On platforms with missing or
    broken poll(2)/ppoll(2) syscalls a select(2)-based compat shim is
    available.
  * ssh-keygen(1): the "-Y find-principals" command was verifying key
    validity when using ca certs but not with simple key lifetimes
    within the allowed signers file.
  * ssh-keygen(1): make sshsig verify-time argument parsing optional
  * sshd(8): fix truncation in rhosts/shosts path construction.
  * ssh(1), ssh-agent(1): avoid xmalloc(0) for PKCS#11 keyid for ECDSA
    keys (we already did this for RSA keys). Avoids fatal errors for
    PKCS#11 libraries that return empty keyid, e.g. Microchip ATECC608B
    "cryptoauthlib"; bz#3364
  * ssh(1), ssh-agent(1): improve the testing of credentials against
    inserted FIDO: ask the token whether a particular key belongs to
    it in cases where the token supports on-token user-verification
    (e.g. biometrics) rather than just assuming that it will accept it.
    Will reduce spurious "Confirm user presence" notifications for key
    handles that relate to FIDO keys that are not currently inserted in at
    least some cases. bz3366
  * ssh(1), sshd(8): correct value for IPTOS_DSCP_LE. It needs to
    allow for the preceding two ECN bits. bz#3373
  * ssh-keygen(1): add missing -O option to usage() for the "-Y sign"
    option.
  * ssh-keygen(1): fix a NULL deref when using the find-principals
    function, when matching an allowed_signers line that contains a
    namespace restriction, but no restriction specified on the
    command-line
  * ssh-agent(1): fix memleak in process_extension(); oss-fuzz
    issue #42719
  * ssh(1): suppress "Connection to xxx closed" messages when LogLevel
    is set to "error" or above. bz3378
  * ssh(1), sshd(8): use correct zlib flags when inflate(3)-ing
    compressed packet data. bz3372
  * scp(1): when recursively transferring files in SFTP mode, create the
    destination directory if it doesn't already exist to match scp(1) in
    legacy RCP mode behaviour.
  * scp(1): many improvements in error message consistency between scp(1)
    in SFTP mode vs legacy RCP mode.
  * sshd(8): fix potential race in SIGTERM handling PR289
  * ssh(1), ssh(8): since DSA keys are deprecated, move them to the
    end of the default list of public keys so that they will be tried
    last. PR295
  * ssh-keygen(1): allow 'ssh-keygen -Y find-principals' to match
    wildcard principals in allowed_signers files
  = Portability
  * ssh(1), sshd(8): don't trust closefrom(2) on Linux. glibc's
    implementation does not work in a chroot when the kernel does not
    have close_range(2). It tries to read from /proc/self/fd and when
    that fails dies with an assertion of sorts. Instead, call
    close_range(2) directly from our compat code and fall back if
    that fails.  bz#3349,
  * OS X poll(2) is broken; use compat replacement. For character-
    special devices like /dev/null, Darwin's poll(2) returns POLLNVAL
    when polled with POLLIN. Apparently this is Apple bug 3710161 -
    not public but a websearch will find other OSS projects
    rediscovering it periodically since it was first identified in
    2005.
  * Correct handling of exceptfds/POLLPRI in our select(2)-based
    poll(2)/ppoll(2) compat implementation.
  * Cygwin: correct checking of mbstowcs() return value.
  * Add a basic SECURITY.md that refers people to the openssh.com
    website.
  * Enable additional compiler warnings and toolchain hardening flags,
    including -Wbitwise-instead-of-logical, -Wmisleading-indentation,
    -fzero-call-used-regs and -ftrivial-auto-var-init.
  * HP/UX. Use compat getline(3) on HP-UX 10.x, where the libc version
    is not reliable.
- Rebased patches:
  * openssh-7.7p1-ldap.patch
  * openssh-8.0p1-gssapi-keyex.patch
  * openssh-8.1p1-audit.patch
  * openssh-8.4p1-vendordir.patch
  * openssh-reenable-dh-group14-sha1-default.patch

OBS-URL: https://build.opensuse.org/request/show/960041
OBS-URL: https://build.opensuse.org/package/show/network/openssh?expand=0&rev=237
2022-03-08 07:49:22 +00:00

2339 lines
69 KiB
Diff
Raw Blame History

Index: openssh-8.9p1/Makefile.in
===================================================================
--- openssh-8.9p1.orig/Makefile.in
+++ openssh-8.9p1/Makefile.in
@@ -116,7 +116,7 @@ LIBSSH_OBJS=${LIBOPENSSH_OBJS} \
kexsntrup761x25519.o sntrup761.o kexgen.o \
kexgssc.o \
sftp-realpath.o platform-pledge.o platform-tracing.o platform-misc.o \
- sshbuf-io.o
+ sshbuf-io.o auditstub.o
SKOBJS= ssh-sk-client.o
Index: openssh-8.9p1/audit-bsm.c
===================================================================
--- openssh-8.9p1.orig/audit-bsm.c
+++ openssh-8.9p1/audit-bsm.c
@@ -373,13 +373,26 @@ audit_connection_from(const char *host,
#endif
}
+int
+audit_run_command(struct ssh *ssh, const char *command)
+{
+ /* not implemented */
+ return 0;
+}
+
void
-audit_run_command(const char *command)
+audit_end_command(struct ssh *ssh, int handle, const char *command)
{
/* not implemented */
}
void
+audit_count_session_open(void)
+{
+ /* not necessary */
+}
+
+void
audit_session_open(struct logininfo *li)
{
/* not implemented */
@@ -391,6 +404,12 @@ audit_session_close(struct logininfo *li
/* not implemented */
}
+int
+audit_keyusage(struct ssh *ssh, int host_user, char *fp, int rv)
+{
+ /* not implemented */
+}
+
void
audit_event(struct ssh *ssh, ssh_audit_event_t event)
{
@@ -452,4 +471,28 @@ audit_event(struct ssh *ssh, ssh_audit_e
debug("%s: unhandled event %d", __func__, event);
}
}
+
+void
+audit_unsupported_body(struct ssh *ssh, int what)
+{
+ /* not implemented */
+}
+
+void
+audit_kex_body(struct ssh *ssh, int ctos, char *enc, char *mac, char *compress, char *pfs, pid_t pid, uid_t uid)
+{
+ /* not implemented */
+}
+
+void
+audit_session_key_free_body(struct ssh * ssh, int ctos, pid_t pid, uid_t uid)
+{
+ /* not implemented */
+}
+
+void
+audit_destroy_sensitive_data(struct ssh *ssh, const char *fp, pid_t pid, uid_t uid)
+{
+ /* not implemented */
+}
#endif /* BSM */
Index: openssh-8.9p1/audit-linux.c
===================================================================
--- openssh-8.9p1.orig/audit-linux.c
+++ openssh-8.9p1/audit-linux.c
@@ -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(struct ssh *ssh, 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(ssh), 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(ssh), 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
@@ -76,49 +176,210 @@ audit_connection_from(const char *host,
/* not implemented */
}
+int
+audit_run_command(struct ssh *ssh, const char *command)
+{
+ if (!user_login_count++)
+ linux_audit_user_logxxx(the_authctxt->pw->pw_uid, NULL,
+ ssh_remote_ipaddr(ssh),
+ "ssh", 1, AUDIT_USER_LOGIN);
+ linux_audit_user_logxxx(the_authctxt->pw->pw_uid, NULL,
+ ssh_remote_ipaddr(ssh),
+ "ssh", 1, AUDIT_USER_START);
+ return 0;
+}
+
void
-audit_run_command(const char *command)
+audit_end_command(struct ssh *ssh, int handle, const char *command)
{
- /* not implemented */
+ linux_audit_user_logxxx(the_authctxt->pw->pw_uid, NULL,
+ ssh_remote_ipaddr(ssh),
+ "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(ssh),
+ "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
audit_event(struct ssh *ssh, ssh_audit_event_t event)
{
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(struct ssh *ssh, 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(ssh), (s = get_local_ipaddr(ssh_packet_get_connection_in(ssh))),
+ ssh_local_port(ssh));
+ 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(ssh), NULL, 0);
+ audit_close(audit_fd);
+#endif
+}
+
+const static char *direction[] = { "from-server", "from-client", "both" };
+
+void
+audit_kex_body(struct ssh *ssh, 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(ssh), (s = get_local_ipaddr(ssh_packet_get_connection_in(ssh))), ssh_local_port(ssh));
+ 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(ssh), 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(struct ssh *ssh, 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(ssh),
+ (s = get_local_ipaddr(ssh_packet_get_connection_in(ssh))),
+ ssh_local_port(ssh));
+ 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(ssh), 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(struct ssh *ssh, 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(ssh),
+ 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 */
Index: openssh-8.9p1/audit.c
===================================================================
--- openssh-8.9p1.orig/audit.c
+++ openssh-8.9p1/audit.c
@@ -34,6 +34,12 @@
#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(struct ssh *ssh, int host_user, int *rv, const struct sshkey *key)
+{
+ char *fp;
+
+ fp = sshkey_fingerprint(key, options.fingerprint_hash, SSH_FP_HEX);
+ if (audit_keyusage(ssh, host_user, fp, (*rv == 0)) == 0)
+ *rv = -SSH_ERR_INTERNAL_ERROR;
+ free(fp);
+}
+
+void
+audit_unsupported(struct ssh *ssh, int what)
+{
+ PRIVSEP(audit_unsupported_body(ssh, what));
+}
+
+void
+audit_kex(struct ssh *ssh, int ctos, char *enc, char *mac, char *comp, char *pfs)
+{
+ PRIVSEP(audit_kex_body(ssh, ctos, enc, mac, comp, pfs, getpid(), getuid()));
+}
+
+void
+audit_session_key_free(struct ssh *ssh, int ctos)
+{
+ PRIVSEP(audit_session_key_free_body(ssh, ctos, getpid(), getuid()));
+}
+
# ifndef CUSTOM_SSH_AUDIT_EVENTS
/*
* Null implementations of audit functions.
@@ -138,6 +171,17 @@ audit_event(struct ssh *ssh, ssh_audit_e
}
/*
+ * 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 +216,82 @@ 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
-audit_run_command(const char *command)
+int
+audit_run_command(struct ssh *ssh, 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(struct ssh *ssh, 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(struct ssh *ssh, 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(struct ssh *ssh, int what)
+{
+ debug("audit unsupported protocol euid %d type %d", geteuid(), what);
+}
+
+/*
+ * This will be called on succesfull protocol negotiation.
+ */
+void
+audit_kex_body(struct ssh *ssh, 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(struct ssh *, 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(struct ssh *ssh, 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 */
Index: openssh-8.9p1/audit.h
===================================================================
--- openssh-8.9p1.orig/audit.h
+++ openssh-8.9p1/audit.h
@@ -26,6 +26,7 @@
# define _SSH_AUDIT_H
#include "loginrec.h"
+#include "sshkey.h"
struct ssh;
@@ -45,13 +46,32 @@ 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(struct ssh *, 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(struct ssh *, const char *);
+void audit_end_command(struct ssh *, int, const char *);
ssh_audit_event_t audit_classify_auth(const char *);
+int audit_keyusage(struct ssh *, int, char *, int);
+void audit_key(struct ssh *, int, int *, const struct sshkey *);
+void audit_unsupported(struct ssh *, int);
+void audit_kex(struct ssh *, int, char *, char *, char *, char *);
+void audit_unsupported_body(struct ssh *, int);
+void audit_kex_body(struct ssh *, int, char *, char *, char *, char *, pid_t, uid_t);
+void audit_session_key_free(struct ssh *, int ctos);
+void audit_session_key_free_body(struct ssh *, int ctos, pid_t, uid_t);
+void audit_destroy_sensitive_data(struct ssh *, const char *, pid_t, uid_t);
#endif /* _SSH_AUDIT_H */
Index: openssh-8.9p1/auditstub.c
===================================================================
--- /dev/null
+++ openssh-8.9p1/auditstub.c
@@ -0,0 +1,52 @@
+/* $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>
+
+struct ssh;
+
+void
+audit_unsupported(struct ssh *ssh, int n)
+{
+}
+
+void
+audit_kex(struct ssh *ssh, int ctos, char *enc, char *mac, char *comp, char *pfs)
+{
+}
+
+void
+audit_session_key_free(struct ssh *ssh, int ctos)
+{
+}
+
+void
+audit_session_key_free_body(struct ssh *ssh, int ctos, pid_t pid, uid_t uid)
+{
+}
Index: openssh-8.9p1/auth.c
===================================================================
--- openssh-8.9p1.orig/auth.c
+++ openssh-8.9p1/auth.c
@@ -599,9 +599,6 @@ getpwnamallow(struct ssh *ssh, const cha
record_failed_login(ssh, user,
auth_get_canonical_hostname(ssh, options.use_dns), "ssh");
#endif
-#ifdef SSH_AUDIT_EVENTS
- audit_event(ssh, SSH_INVALID_USER);
-#endif /* SSH_AUDIT_EVENTS */
return (NULL);
}
if (!allowed_user(ssh, pw))
Index: openssh-8.9p1/auth.h
===================================================================
--- openssh-8.9p1.orig/auth.h
+++ openssh-8.9p1/auth.h
@@ -190,6 +190,8 @@ struct passwd * getpwnamallow(struct ssh
char *expand_authorized_keys(const char *, struct passwd *pw);
char *authorized_principals_file(struct passwd *);
+int user_key_verify(struct ssh *, const struct sshkey *, const u_char *, size_t,
+ const u_char *, size_t, const char *, u_int, struct sshkey_sig_details **);
FILE *auth_openkeyfile(const char *, struct passwd *, int);
FILE *auth_openprincipals(const char *, struct passwd *, int);
@@ -209,6 +211,8 @@ struct sshkey *get_hostkey_private_by_ty
int get_hostkey_index(struct sshkey *, int, struct ssh *);
int sshd_hostkey_sign(struct ssh *, struct sshkey *, struct sshkey *,
u_char **, size_t *, const u_char *, size_t, const char *);
+int hostbased_key_verify(struct ssh *, const struct sshkey *, const u_char *, size_t,
+ const u_char *, size_t, const char *, u_int, struct sshkey_sig_details **);
/* Key / cert options linkage to auth layer */
const struct sshauthopt *auth_options(struct ssh *);
Index: openssh-8.9p1/auth2-hostbased.c
===================================================================
--- openssh-8.9p1.orig/auth2-hostbased.c
+++ openssh-8.9p1/auth2-hostbased.c
@@ -149,7 +149,7 @@ userauth_hostbased(struct ssh *ssh, cons
authenticated = 0;
if (PRIVSEP(hostbased_key_allowed(ssh, authctxt->pw, cuser,
chost, key)) &&
- PRIVSEP(sshkey_verify(key, sig, slen,
+ PRIVSEP(hostbased_key_verify(ssh, key, sig, slen,
sshbuf_ptr(b), sshbuf_len(b), pkalg, ssh->compat, NULL)) == 0)
authenticated = 1;
@@ -166,6 +166,19 @@ done:
return authenticated;
}
+int
+hostbased_key_verify(struct ssh *ssh, const struct sshkey *key, const u_char *sig,
+ size_t slen, const u_char *data, size_t datalen, const char *pkalg, u_int compat, struct sshkey_sig_details **sigdet)
+{
+ int rv;
+
+ rv = sshkey_verify(key, sig, slen, data, datalen, pkalg, compat, sigdet);
+#ifdef SSH_AUDIT_EVENTS
+ audit_key(ssh, 0, &rv, key);
+#endif
+ return rv;
+}
+
/* return 1 if given hostkey is allowed */
int
hostbased_key_allowed(struct ssh *ssh, struct passwd *pw,
Index: openssh-8.9p1/auth2-pubkey.c
===================================================================
--- openssh-8.9p1.orig/auth2-pubkey.c
+++ openssh-8.9p1/auth2-pubkey.c
@@ -223,7 +223,7 @@ userauth_pubkey(struct ssh *ssh, const c
/* 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(ssh, key, sig, slen,
sshbuf_ptr(b), sshbuf_len(b),
(ssh->compat & SSH_BUG_SIGTYPE) == 0 ? pkalg : NULL,
ssh->compat, &sig_details)) == 0) {
@@ -316,6 +316,19 @@ done:
return authenticated;
}
+int
+user_key_verify(struct ssh *ssh, const struct sshkey *key, const u_char *sig,
+ size_t slen, const u_char *data, size_t datalen, const char *pkalg, u_int compat, struct sshkey_sig_details **sigdet)
+{
+ int rv;
+
+ rv = sshkey_verify(key, sig, slen, data, datalen, pkalg, compat, sigdet);
+#ifdef SSH_AUDIT_EVENTS
+ audit_key(ssh, 1, &rv, key);
+#endif
+ return rv;
+}
+
static int
match_principals_option(const char *principal_list, struct sshkey_cert *cert)
{
Index: openssh-8.9p1/auth2.c
===================================================================
--- openssh-8.9p1.orig/auth2.c
+++ openssh-8.9p1/auth2.c
@@ -294,9 +294,6 @@ input_userauth_request(int type, u_int32
authctxt->valid = 0;
/* Invalid user, fake password information */
authctxt->pw = fakepw();
-#ifdef SSH_AUDIT_EVENTS
- PRIVSEP(audit_event(ssh, SSH_INVALID_USER));
-#endif
}
#ifdef USE_PAM
if (options.use_pam)
Index: openssh-8.9p1/cipher.c
===================================================================
--- openssh-8.9p1.orig/cipher.c
+++ openssh-8.9p1/cipher.c
@@ -58,25 +58,6 @@
#define EVP_CIPHER_CTX void
#endif
-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_all[] = {
#ifdef WITH_OPENSSL
#ifndef OPENSSL_NO_DES
@@ -460,7 +441,7 @@ 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) {
chachapoly_free(cc->cp_ctx);
Index: openssh-8.9p1/cipher.h
===================================================================
--- openssh-8.9p1.orig/cipher.h
+++ openssh-8.9p1/cipher.h
@@ -47,7 +47,25 @@
#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 {
int plaintext;
int encrypt;
Index: openssh-8.9p1/kex.c
===================================================================
--- openssh-8.9p1.orig/kex.c
+++ openssh-8.9p1/kex.c
@@ -62,6 +62,7 @@
#include "ssherr.h"
#include "sshbuf.h"
#include "digest.h"
+#include "audit.h"
#ifdef GSSAPI
#include "ssh-gss.h"
@@ -879,12 +880,16 @@ kex_start_rekex(struct ssh *ssh)
}
static int
-choose_enc(struct sshenc *enc, char *client, char *server)
+choose_enc(struct ssh *ssh, struct sshenc *enc, char *client, char *server)
{
char *name = match_list(client, server, NULL);
- if (name == NULL)
+ if (name == NULL) {
+#ifdef SSH_AUDIT_EVENTS
+ audit_unsupported(ssh, SSH_AUDIT_UNSUPPORTED_CIPHER);
+#endif
return SSH_ERR_NO_CIPHER_ALG_MATCH;
+ }
if ((enc->cipher = cipher_by_name(name)) == NULL) {
error_f("unsupported cipher %s", name);
free(name);
@@ -905,8 +910,12 @@ 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, SSH_AUDIT_UNSUPPORTED_MAC);
+#endif
return SSH_ERR_NO_MAC_ALG_MATCH;
+ }
if (mac_setup(mac, name) < 0) {
error_f("unsupported MAC %s", name);
free(name);
@@ -919,12 +928,16 @@ choose_mac(struct ssh *ssh, struct sshma
}
static int
-choose_comp(struct sshcomp *comp, char *client, char *server)
+choose_comp(struct ssh *ssh, struct sshcomp *comp, char *client, char *server)
{
char *name = match_list(client, server, NULL);
- if (name == NULL)
+ if (name == NULL) {
+#ifdef SSH_AUDIT_EVENTS
+ audit_unsupported(ssh, SSH_AUDIT_UNSUPPORTED_COMPRESSION);
+#endif
return SSH_ERR_NO_COMPRESS_ALG_MATCH;
+ }
#ifdef WITH_ZLIB
if (strcmp(name, "zlib@openssh.com") == 0) {
comp->type = COMP_DELAYED;
@@ -1087,7 +1100,7 @@ kex_choose_conf(struct ssh *ssh)
nenc = ctos ? PROPOSAL_ENC_ALGS_CTOS : PROPOSAL_ENC_ALGS_STOC;
nmac = ctos ? PROPOSAL_MAC_ALGS_CTOS : PROPOSAL_MAC_ALGS_STOC;
ncomp = ctos ? PROPOSAL_COMP_ALGS_CTOS : PROPOSAL_COMP_ALGS_STOC;
- if ((r = choose_enc(&newkeys->enc, cprop[nenc],
+ if ((r = choose_enc(ssh, &newkeys->enc, cprop[nenc],
sprop[nenc])) != 0) {
kex->failed_choice = peer[nenc];
peer[nenc] = NULL;
@@ -1102,7 +1115,7 @@ kex_choose_conf(struct ssh *ssh)
peer[nmac] = NULL;
goto out;
}
- if ((r = choose_comp(&newkeys->comp, cprop[ncomp],
+ if ((r = choose_comp(ssh, &newkeys->comp, cprop[ncomp],
sprop[ncomp])) != 0) {
kex->failed_choice = peer[ncomp];
peer[ncomp] = NULL;
@@ -1125,6 +1138,10 @@ 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(ssh, mode, newkeys->enc.name, newkeys->mac.name, newkeys->comp.name, kex->name);
+#endif
}
/* XXX need runden? */
kex->we_need = need;
@@ -1292,6 +1309,36 @@ dump_digest(const char *msg, const u_cha
}
#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));
+}
+
/*
* Send a plaintext error message to the peer, suffixed by \r\n.
* Only used during banner exchange, and there only for the server.
Index: openssh-8.9p1/kex.h
===================================================================
--- openssh-8.9p1.orig/kex.h
+++ openssh-8.9p1/kex.h
@@ -233,6 +233,8 @@ int kexgss_client(struct ssh *);
int kexgss_server(struct ssh *);
#endif
+void newkeys_destroy(struct newkeys *newkeys);
+
int kex_dh_keypair(struct kex *);
int kex_dh_enc(struct kex *, const struct sshbuf *, struct sshbuf **,
struct sshbuf **);
Index: openssh-8.9p1/mac.c
===================================================================
--- openssh-8.9p1.orig/mac.c
+++ openssh-8.9p1/mac.c
@@ -277,6 +277,20 @@ 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
Index: openssh-8.9p1/mac.h
===================================================================
--- openssh-8.9p1.orig/mac.h
+++ openssh-8.9p1/mac.h
@@ -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 */
Index: openssh-8.9p1/monitor.c
===================================================================
--- openssh-8.9p1.orig/monitor.c
+++ openssh-8.9p1/monitor.c
@@ -93,6 +93,7 @@
#include "compat.h"
#include "ssh2.h"
#include "authfd.h"
+#include "audit.h"
#include "match.h"
#include "ssherr.h"
#include "sk-api.h"
@@ -107,6 +108,8 @@ extern u_int utmp_len;
extern struct sshbuf *loginmsg;
extern struct sshauthopt *auth_opts; /* XXX move to permanent ssh->authctxt? */
+extern void destroy_sensitive_data(struct ssh *, int);
+
/* State exported from the child */
static struct sshbuf *child_state;
@@ -152,6 +155,11 @@ int mm_answer_gss_updatecreds(struct ssh
#ifdef SSH_AUDIT_EVENTS
int mm_answer_audit_event(struct ssh *, int, struct sshbuf *);
int mm_answer_audit_command(struct ssh *, int, struct sshbuf *);
+int mm_answer_audit_end_command(struct ssh *, int, struct sshbuf *);
+int mm_answer_audit_unsupported_body(struct ssh *, int, struct sshbuf *);
+int mm_answer_audit_kex_body(struct ssh *, int, struct sshbuf *);
+int mm_answer_audit_session_key_free_body(struct ssh *, int, struct sshbuf *);
+int mm_answer_audit_server_key_free(struct ssh *, int, struct sshbuf *);
#endif
static Authctxt *authctxt;
@@ -207,6 +215,10 @@ 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},
@@ -241,6 +253,11 @@ 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}
};
@@ -1419,8 +1436,10 @@ mm_answer_keyverify(struct ssh *ssh, int
int r, ret, req_presence = 0, req_verify = 0, valid_data = 0;
int encoded_ret;
struct sshkey_sig_details *sig_details = NULL;
+ int type = 0;
- if ((r = sshbuf_get_string_direct(m, &blob, &bloblen)) != 0 ||
+ if ((r = sshbuf_get_u32(m, &type)) != 0 ||
+ (r = sshbuf_get_string_direct(m, &blob, &bloblen)) != 0 ||
(r = sshbuf_get_string_direct(m, &signature, &signaturelen)) != 0 ||
(r = sshbuf_get_string_direct(m, &data, &datalen)) != 0 ||
(r = sshbuf_get_cstring(m, &sigalg, NULL)) != 0)
@@ -1429,6 +1448,8 @@ mm_answer_keyverify(struct ssh *ssh, int
if (hostbased_cuser == NULL || hostbased_chost == NULL ||
!monitor_allowed_key(blob, bloblen))
fatal_f("bad key, not previously allowed");
+ if (type != key_blobtype)
+ fatal_f("bad key type");
/* Empty signature algorithm means NULL. */
if (*sigalg == '\0') {
@@ -1444,14 +1465,19 @@ mm_answer_keyverify(struct ssh *ssh, int
case MM_USERKEY:
valid_data = monitor_valid_userblob(ssh, data, datalen);
auth_method = "publickey";
+ ret = user_key_verify(ssh, key, signature, signaturelen, data,
+ datalen, sigalg, ssh->compat, &sig_details);
break;
case MM_HOSTKEY:
valid_data = monitor_valid_hostbasedblob(data, datalen,
hostbased_cuser, hostbased_chost);
auth_method = "hostbased";
+ ret = hostbased_key_verify(ssh, key, signature, signaturelen, data,
+ datalen, sigalg, ssh->compat, &sig_details);
break;
default:
valid_data = 0;
+ ret = 0;
break;
}
if (!valid_data)
@@ -1463,8 +1489,6 @@ mm_answer_keyverify(struct ssh *ssh, int
SSH_FP_DEFAULT)) == NULL)
fatal_f("sshkey_fingerprint failed");
- ret = sshkey_verify(key, signature, signaturelen, data, datalen,
- sigalg, ssh->compat, &sig_details);
debug3_f("%s %s signature using %s %s%s%s", auth_method,
sshkey_type(key), sigalg == NULL ? "default" : sigalg,
(ret == 0) ? "verified" : "unverified",
@@ -1552,13 +1576,19 @@ mm_record_login(struct ssh *ssh, Session
}
static void
-mm_session_close(Session *s)
+mm_session_close(struct ssh *ssh, Session *s)
{
debug3_f("session %d pid %ld", s->self, (long)s->pid);
if (s->ttyfd != -1) {
debug3_f("tty %s ptyfd %d", s->tty, s->ptyfd);
session_pty_cleanup2(s);
}
+#ifdef SSH_AUDIT_EVENTS
+ if (s->command != NULL) {
+ debug3_f("command %d", s->command_handle);
+ session_end_command2(ssh, s);
+ }
+#endif
session_unused(s->self);
}
@@ -1625,7 +1655,7 @@ mm_answer_pty(struct ssh *ssh, int sock,
error:
if (s != NULL)
- mm_session_close(s);
+ mm_session_close(ssh, s);
if ((r = sshbuf_put_u32(m, 0)) != 0)
fatal_fr(r, "assemble 0");
mm_request_send(sock, MONITOR_ANS_PTY, m);
@@ -1644,7 +1674,7 @@ mm_answer_pty_cleanup(struct ssh *ssh, i
if ((r = sshbuf_get_cstring(m, &tty, NULL)) != 0)
fatal_fr(r, "parse tty");
if ((s = session_by_tty(tty)) != NULL)
- mm_session_close(s);
+ mm_session_close(ssh, s);
sshbuf_reset(m);
free(tty);
return (0);
@@ -1666,6 +1696,8 @@ mm_answer_term(struct ssh *ssh, int sock
sshpam_cleanup();
#endif
+ destroy_sensitive_data(ssh, 0);
+
while (waitpid(pmonitor->m_pid, &status, 0) == -1)
if (errno != EINTR)
exit(1);
@@ -1712,12 +1744,47 @@ mm_answer_audit_command(struct ssh *ssh,
{
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(ssh, 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(struct ssh *ssh, 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(ssh, s);
free(cmd);
return (0);
}
@@ -1789,6 +1856,7 @@ monitor_apply_keystate(struct ssh *ssh,
void
mm_get_keystate(struct ssh *ssh, struct monitor *pmonitor)
{
+ struct sshbuf *m;
debug3_f("Waiting for new keys");
if ((child_state = sshbuf_new()) == NULL)
@@ -1796,6 +1864,18 @@ mm_get_keystate(struct ssh *ssh, struct
mm_request_receive_expect(pmonitor->m_sendfd, MONITOR_REQ_KEYEXPORT,
child_state);
debug3_f("GOT new keys");
+
+#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(ssh, 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)
+ ;
}
@@ -2073,3 +2153,102 @@ mm_answer_gss_updatecreds(struct ssh *ss
#endif /* GSSAPI */
+#ifdef SSH_AUDIT_EVENTS
+int
+mm_answer_audit_unsupported_body(struct ssh *ssh, 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(ssh, what);
+
+ sshbuf_reset(m);
+
+ mm_request_send(sock, MONITOR_ANS_AUDIT_UNSUPPORTED, m);
+ return 0;
+}
+
+int
+mm_answer_audit_kex_body(struct ssh *ssh, 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(ssh, 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(struct ssh *ssh, 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(ssh, 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(struct ssh *ssh, 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(ssh, fp, pid, uid);
+
+ free(fp);
+ sshbuf_reset(m);
+
+ return 0;
+}
+#endif /* SSH_AUDIT_EVENTS */
Index: openssh-8.9p1/monitor.h
===================================================================
--- openssh-8.9p1.orig/monitor.h
+++ openssh-8.9p1/monitor.h
@@ -61,7 +61,13 @@ 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,
MONITOR_REQ_GSSSIGN = 150, MONITOR_ANS_GSSSIGN = 151,
MONITOR_REQ_GSSUPCREDS = 152, MONITOR_ANS_GSSUPCREDS = 153,
Index: openssh-8.9p1/monitor_wrap.c
===================================================================
--- openssh-8.9p1.orig/monitor_wrap.c
+++ openssh-8.9p1/monitor_wrap.c
@@ -499,7 +499,7 @@ 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 sshkey_sig_details **sig_detailsp)
{
@@ -515,7 +515,8 @@ mm_sshkey_verify(const struct sshkey *ke
*sig_detailsp = NULL;
if ((m = sshbuf_new()) == NULL)
fatal_f("sshbuf_new failed");
- 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)
@@ -548,6 +549,20 @@ mm_sshkey_verify(const struct sshkey *ke
return 0;
}
+int
+mm_hostbased_key_verify(struct ssh *ssh, const struct sshkey *key, const u_char *sig, size_t siglen,
+ const u_char *data, size_t datalen, const char *pkalg, u_int compat, struct sshkey_sig_details **sigdet)
+{
+ return mm_sshkey_verify(MM_HOSTKEY, key, sig, siglen, data, datalen, pkalg, compat, sigdet);
+}
+
+int
+mm_user_key_verify(struct ssh *ssh, const struct sshkey *key, const u_char *sig, size_t siglen,
+ const u_char *data, size_t datalen, const char *pkalg, u_int compat, struct sshkey_sig_details **sigdet)
+{
+ return mm_sshkey_verify(MM_USERKEY, key, sig, siglen, data, datalen, pkalg, compat, sigdet);
+}
+
void
mm_send_keystate(struct ssh *ssh, struct monitor *monitor)
{
@@ -900,11 +915,12 @@ mm_audit_event(struct ssh *ssh, ssh_audi
sshbuf_free(m);
}
-void
-mm_audit_run_command(const char *command)
+int
+mm_audit_run_command(struct ssh *ssh, const char *command)
{
struct sshbuf *m;
int r;
+ int handle;
debug3("%s entering command %s", __func__, command);
@@ -914,6 +930,30 @@ 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(struct ssh *ssh, 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 */
@@ -1074,3 +1114,83 @@ mm_ssh_gssapi_update_creds(ssh_gssapi_cc
}
#endif /* GSSAPI */
+#ifdef SSH_AUDIT_EVENTS
+void
+mm_audit_unsupported_body(struct ssh *ssh, 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(struct ssh *ssh, 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(struct ssh *ssh, 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(struct ssh *ssh, 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 */
Index: openssh-8.9p1/monitor_wrap.h
===================================================================
--- openssh-8.9p1.orig/monitor_wrap.h
+++ openssh-8.9p1/monitor_wrap.h
@@ -58,7 +58,9 @@ int mm_user_key_allowed(struct ssh *, st
struct sshauthopt **);
int mm_hostbased_key_allowed(struct ssh *, 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(struct ssh *, const struct sshkey *, const u_char *, size_t,
+ const u_char *, size_t, const char *, u_int, struct sshkey_sig_details **);
+int mm_user_key_verify(struct ssh *, const struct sshkey *, const u_char *, size_t,
const u_char *, size_t, const char *, u_int, struct sshkey_sig_details **);
#ifdef GSSAPI
@@ -83,7 +85,12 @@ void mm_sshpam_free_ctx(void *);
#ifdef SSH_AUDIT_EVENTS
#include "audit.h"
void mm_audit_event(struct ssh *, ssh_audit_event_t);
-void mm_audit_run_command(const char *);
+int mm_audit_run_command(struct ssh *ssh, const char *);
+void mm_audit_end_command(struct ssh *ssh, int, const char *);
+void mm_audit_unsupported_body(struct ssh *, int);
+void mm_audit_kex_body(struct ssh *, int, char *, char *, char *, char *, pid_t, uid_t);
+void mm_audit_session_key_free_body(struct ssh *, int, pid_t, uid_t);
+void mm_audit_destroy_sensitive_data(struct ssh *, const char *, pid_t, uid_t);
#endif
struct Session;
Index: openssh-8.9p1/packet.c
===================================================================
--- openssh-8.9p1.orig/packet.c
+++ openssh-8.9p1/packet.c
@@ -81,6 +81,7 @@
#endif
#include "xmalloc.h"
+#include "audit.h"
#include "compat.h"
#include "ssh2.h"
#include "cipher.h"
@@ -506,6 +507,13 @@ 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.
@@ -583,22 +591,19 @@ 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;
@@ -634,8 +639,18 @@ ssh_packet_close_internal(struct ssh *ss
#endif /* WITH_ZLIB */
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(ssh, 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);
@@ -892,6 +907,7 @@ ssh_set_newkeys(struct ssh *ssh, int mod
(unsigned long long)state->p_send.bytes,
(unsigned long long)state->p_send.blocks);
kex_free_newkeys(state->newkeys[mode]);
+ audit_session_key_free(ssh, mode);
state->newkeys[mode] = NULL;
}
/* note that both bytes and the seqnr are not reset */
@@ -2183,6 +2199,73 @@ 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);
+ state->receive_context = NULL;
+ cipher_free(state->send_context);
+ state->send_context = NULL;
+
+ 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(struct ssh *ssh, int audit_it, int privsep)
+{
+ if (audit_it)
+ audit_it = packet_state_has_keys(ssh->state);
+ packet_destroy_state(ssh->state);
+ if (audit_it) {
+#ifdef SSH_AUDIT_EVENTS
+ if (privsep)
+ audit_session_key_free(ssh, MODE_MAX);
+ else
+ audit_session_key_free_body(ssh, MODE_MAX, getpid(), getuid());
+#endif
+ }
+}
+
/* Reset after_authentication and reset compression in post-auth privsep */
static int
ssh_packet_set_postauth(struct ssh *ssh)
Index: openssh-8.9p1/packet.h
===================================================================
--- openssh-8.9p1.orig/packet.h
+++ openssh-8.9p1/packet.h
@@ -220,4 +220,5 @@ const u_char *sshpkt_ptr(struct ssh *, s
# undef EC_POINT
#endif
+void packet_destroy_all(struct ssh *, int, int);
#endif /* PACKET_H */
Index: openssh-8.9p1/session.c
===================================================================
--- openssh-8.9p1.orig/session.c
+++ openssh-8.9p1/session.c
@@ -135,7 +135,7 @@ 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(struct ssh *, int);
extern struct sshbuf *loginmsg;
extern struct sshauthopt *auth_opts;
extern char *tun_fwd_ifnames; /* serverloop.c */
@@ -642,6 +642,14 @@ 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;
ssh_packet_set_interactive(ssh, 1,
@@ -706,15 +714,19 @@ 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(ssh, s->command));
#endif
if (s->ttyfd != -1)
ret = do_exec_pty(ssh, s, command);
@@ -1533,8 +1545,11 @@ do_child(struct ssh *ssh, Session *s, co
sshpkt_fmt_connection_id(ssh, remote_id, sizeof(remote_id));
/* remove hostkey from the child's memory */
- destroy_sensitive_data();
+ destroy_sensitive_data(ssh, 1);
ssh_packet_clear_keys(ssh);
+ /* 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(ssh, 0, 1);
/* Force a password change */
if (s->authctxt->force_pwchange) {
@@ -1743,6 +1758,9 @@ 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;
}
@@ -1822,6 +1840,19 @@ 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;
@@ -2429,6 +2460,32 @@ session_exit_message(struct ssh *ssh, Se
chan_write_failed(ssh, c);
}
+#ifdef SSH_AUDIT_EVENTS
+void
+session_end_command2(struct ssh *ssh, Session *s)
+{
+ if (s->command != NULL) {
+ if (s->command_handle != -1)
+ audit_end_command(ssh, s->command_handle, s->command);
+ free(s->command);
+ s->command = NULL;
+ s->command_handle = -1;
+ }
+}
+
+static void
+session_end_command(struct ssh *ssh, Session *s)
+{
+ if (s->command != NULL) {
+ if (s->command_handle != -1)
+ PRIVSEP(audit_end_command(ssh, s->command_handle, s->command));
+ free(s->command);
+ s->command = NULL;
+ s->command_handle = -1;
+ }
+}
+#endif
+
void
session_close(struct ssh *ssh, Session *s)
{
@@ -2470,6 +2527,10 @@ session_close(struct ssh *ssh, Session *
if (s->ttyfd != -1)
session_pty_cleanup(s);
+#ifdef SSH_AUDIT_EVENTS
+ if (s->command)
+ session_end_command(ssh, s);
+#endif
free(s->term);
free(s->display);
free(s->x11_chanids);
@@ -2544,14 +2605,14 @@ session_close_by_channel(struct ssh *ssh
}
void
-session_destroy_all(struct ssh *ssh, void (*closefunc)(Session *))
+session_destroy_all(struct ssh *ssh, void (*closefunc)(struct ssh *ssh, Session *))
{
int i;
for (i = 0; i < sessions_nalloc; i++) {
Session *s = &sessions[i];
if (s->used) {
if (closefunc != NULL)
- closefunc(s);
+ closefunc(ssh, s);
else
session_close(ssh, s);
}
@@ -2677,6 +2738,15 @@ do_authenticated2(struct ssh *ssh, Authc
server_loop2(ssh, authctxt);
}
+static void
+do_cleanup_one_session(struct ssh *ssh, Session *s)
+{
+ session_pty_cleanup2(s);
+#ifdef SSH_AUDIT_EVENTS
+ session_end_command2(ssh, s);
+#endif
+}
+
void
do_cleanup(struct ssh *ssh, Authctxt *authctxt)
{
@@ -2740,7 +2810,7 @@ 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 */
Index: openssh-8.9p1/session.h
===================================================================
--- openssh-8.9p1.orig/session.h
+++ openssh-8.9p1/session.h
@@ -61,6 +61,12 @@ struct Session {
char *name;
char *val;
} *env;
+
+ /* exec */
+#ifdef SSH_AUDIT_EVENTS
+ int command_handle;
+ char *command;
+#endif
};
void do_authenticated(struct ssh *, Authctxt *);
@@ -71,10 +77,12 @@ void session_unused(int);
int session_input_channel_req(struct ssh *, Channel *, const char *);
void session_close_by_pid(struct ssh *ssh, pid_t, int);
void session_close_by_channel(struct ssh *, int, void *);
-void session_destroy_all(struct ssh *, void (*)(Session *));
+void session_destroy_all(struct ssh *, void (*)(struct ssh*, Session *));
void session_pty_cleanup2(Session *);
+void session_end_command2(struct ssh *ssh, 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 *);
Index: openssh-8.9p1/sshd.c
===================================================================
--- openssh-8.9p1.orig/sshd.c
+++ openssh-8.9p1/sshd.c
@@ -125,6 +125,7 @@
#include "ssh-gss.h"
#endif
#include "monitor_wrap.h"
+#include "audit.h"
#include "ssh-sandbox.h"
#include "auth-options.h"
#include "version.h"
@@ -265,8 +266,8 @@ struct sshbuf *loginmsg;
struct passwd *privsep_pw = NULL;
/* Prototypes for various functions defined later in this file. */
-void destroy_sensitive_data(void);
-void demote_sensitive_data(void);
+void destroy_sensitive_data(struct ssh *, int);
+void demote_sensitive_data(struct ssh *);
static void do_ssh2_kex(struct ssh *);
static char *listener_proctitle;
@@ -284,6 +285,15 @@ close_listen_socks(void)
num_listen_socks = 0;
}
+/*
+ * 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)
{
@@ -382,18 +392,45 @@ grace_alarm_handler(int sig)
ssh_remote_port(the_active_state));
}
-/* 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(struct ssh *ssh, 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(ssh, fp,
+ pid, uid));
+ else
+ audit_destroy_sensitive_data(ssh, 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;
}
@@ -402,20 +439,38 @@ destroy_sensitive_data(void)
/* Demote private to public keys for network child */
void
-demote_sensitive_data(void)
+demote_sensitive_data(struct ssh *ssh)
{
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_r(r, "could not demote host %s key",
sshkey_type(sensitive_data.host_keys[i]));
sshkey_free(sensitive_data.host_keys[i]);
sensitive_data.host_keys[i] = tmp;
+ if (fp != NULL) {
+#ifdef SSH_AUDIT_EVENTS
+ audit_destroy_sensitive_data(ssh, fp, pid, uid);
+#endif
+ free(fp);
+ }
}
/* Certs do not need demotion */
}
@@ -443,7 +498,7 @@ reseed_prngs(void)
}
static void
-privsep_preauth_child(void)
+privsep_preauth_child(struct ssh *ssh)
{
gid_t gidset[1];
@@ -458,7 +513,7 @@ privsep_preauth_child(void)
reseed_prngs();
/* Demote the private keys to public keys. */
- demote_sensitive_data();
+ demote_sensitive_data(ssh);
/* Demote the child */
if (privsep_chroot) {
@@ -493,7 +548,7 @@ privsep_preauth(struct ssh *ssh)
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) {
@@ -538,7 +593,7 @@ privsep_preauth(struct ssh *ssh)
/* Arrange for logging to be sent to the monitor */
set_log_handler(mm_log_handler, pmonitor);
- privsep_preauth_child();
+ privsep_preauth_child(ssh);
setproctitle("%s", "[net]");
if (box != NULL)
ssh_sandbox_child(box);
@@ -582,7 +637,7 @@ privsep_postauth(struct ssh *ssh, Authct
pmonitor->m_sendfd = -1;
/* Demote the private keys to public keys. */
- demote_sensitive_data();
+ demote_sensitive_data(ssh);
reseed_prngs();
@@ -1136,7 +1191,7 @@ server_listen(void)
* from this function are in a forked subprocess.
*/
static void
-server_accept_loop(int *sock_in, int *sock_out, int *newsock, int *config_s)
+server_accept_loop(struct ssh *ssh, int *sock_in, int *sock_out, int *newsock, int *config_s)
{
struct pollfd *pfd = NULL;
int i, j, ret;
@@ -1179,6 +1234,7 @@ server_accept_loop(int *sock_in, int *so
if (received_sigterm) {
logit("Received signal %d; terminating.",
(int) received_sigterm);
+ destroy_sensitive_data(ssh, 0);
close_listen_socks();
if (options.pid_file != NULL)
unlink(options.pid_file);
@@ -2088,7 +2144,7 @@ main(int ac, char **av)
#endif
/* Accept a connection and return in a forked child */
- server_accept_loop(&sock_in, &sock_out,
+ server_accept_loop(ssh, &sock_in, &sock_out,
&newsock, config_s);
}
@@ -2311,6 +2367,9 @@ main(int ac, char **av)
do_authenticated(ssh, authctxt);
/* The connection has been terminated. */
+ packet_destroy_all(ssh, 1, 1);
+ destroy_sensitive_data(ssh, 1);
+
ssh_packet_get_bytes(ssh, &ibytes, &obytes);
verbose("Transferred: sent %llu, received %llu bytes",
(unsigned long long)obytes, (unsigned long long)ibytes);
@@ -2491,6 +2550,15 @@ do_ssh2_kex(struct ssh *ssh)
void
cleanup_exit(int i)
{
+ 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_active_state != NULL && the_authctxt != NULL) {
do_cleanup(the_active_state, the_authctxt);
if (use_privsep && privsep_is_preauth &&
@@ -2503,9 +2571,16 @@ cleanup_exit(int i)
}
}
}
+ is_privsep_child = use_privsep && pmonitor != NULL && pmonitor->m_pid == 0;
+ if (sensitive_data.host_keys != NULL && the_active_state != NULL)
+ destroy_sensitive_data(the_active_state, is_privsep_child);
+ if (the_active_state != NULL)
+ packet_destroy_all(the_active_state, 1, is_privsep_child);
#ifdef SSH_AUDIT_EVENTS
/* done after do_cleanup so it can cancel the PAM auth 'thread' */
- if (the_active_state != NULL && (!use_privsep || mm_is_monitor()))
+ if (the_active_state != NULL &&
+ (the_authctxt == NULL || !the_authctxt->authenticated) &&
+ (!use_privsep || mm_is_monitor()))
audit_event(the_active_state, SSH_CONNECTION_ABANDON);
#endif
_exit(i);
Index: openssh-8.9p1/sshkey.c
===================================================================
--- openssh-8.9p1.orig/sshkey.c
+++ openssh-8.9p1/sshkey.c
@@ -400,6 +400,38 @@ 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)
Index: openssh-8.9p1/sshkey.h
===================================================================
--- openssh-8.9p1.orig/sshkey.h
+++ openssh-8.9p1/sshkey.h
@@ -189,6 +189,7 @@ int sshkey_shield_private(struct sshke
int sshkey_unshield_private(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_is_sk(const struct sshkey *);
int sshkey_type_is_cert(int);
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