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openssh/openssh-7.7p1-gssapi_key_exchange.patch
Tomáš Chvátal 5fcc01190a Accepting request 679869 from home:vitezslav_cizek:branches:network 
- Remove the "KexDHMin" config keyword (bsc#1127180)
  It used to allow lowering of the minimal allowed DH group size,
  which was increased to 2048 by upstream in the light of the Logjam
  attack.
  The code was broken since the upgrade to 7.6p1, but nobody noticed.
  As apparently no one needs the functionality any more, let's drop
  the patch.
  It's still possible to use the fixed 1024-bit diffie-hellman-group1-sha1
  key exchange method when working with legacy systems.
- drop openssh-7.7p1-disable_short_DH_parameters.patch
- updated patches:
  openssh-7.7p1-fips.patch
  openssh-7.7p1-fips_checks.patch
  openssh-7.7p1-gssapi_key_exchange.patch

OBS-URL: https://build.opensuse.org/request/show/679869
OBS-URL: https://build.opensuse.org/package/show/network/openssh?expand=0&rev=181
2019-02-27 15:39:11 +00:00

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# HG changeset patch
# Parent 6a2300496d25e85647e718287d4d9f37170f492a
Index: openssh-7.9p1/Makefile.in
===================================================================
--- openssh-7.9p1.orig/Makefile.in 2019-02-27 15:43:51.360515721 +0100
+++ openssh-7.9p1/Makefile.in 2019-02-27 15:43:55.360539487 +0100
@@ -104,10 +104,13 @@ 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 \
+ kexgssc.o \
platform-pledge.o platform-tracing.o platform-misc.o
LIBSSH_OBJS += fips.o
+LIBSSH_OBJS += kexgssc.o kexgsss.o
+
SSHOBJS= ssh.o readconf.o clientloop.o sshtty.o \
sshconnect.o sshconnect2.o mux.o
@@ -119,7 +122,7 @@ SSHDOBJS=sshd.o auth-rhosts.o auth-passw
auth-bsdauth.o auth2-hostbased.o auth2-kbdint.o \
auth2-none.o auth2-passwd.o auth2-pubkey.o \
monitor.o monitor_wrap.o auth-krb5.o \
- auth2-gss.o gss-serv.o gss-serv-krb5.o \
+ auth2-gss.o gss-serv.o gss-serv-krb5.o kexgsss.o \
loginrec.o auth-pam.o auth-shadow.o auth-sia.o md5crypt.o \
sftp-server.o sftp-common.o \
sandbox-null.o sandbox-rlimit.o sandbox-systrace.o sandbox-darwin.o \
Index: openssh-7.9p1/auth-krb5.c
===================================================================
--- openssh-7.9p1.orig/auth-krb5.c 2018-10-17 02:01:20.000000000 +0200
+++ openssh-7.9p1/auth-krb5.c 2019-02-27 15:43:51.428516125 +0100
@@ -182,8 +182,13 @@ auth_krb5_password(Authctxt *authctxt, c
len = strlen(authctxt->krb5_ticket_file) + 6;
authctxt->krb5_ccname = xmalloc(len);
+#ifdef USE_CCAPI
+ snprintf(authctxt->krb5_ccname, len, "API:%s",
+ authctxt->krb5_ticket_file);
+#else
snprintf(authctxt->krb5_ccname, len, "FILE:%s",
authctxt->krb5_ticket_file);
+#endif
#ifdef USE_PAM
if (options.use_pam)
@@ -243,12 +248,18 @@ ssh_krb5_cc_gen(krb5_context ctx, krb5_c
int tmpfd, ret, oerrno;
char ccname[40];
mode_t old_umask;
+#ifdef USE_CCAPI
+ char cctemplate[] = "API:krb5cc_%d";
+#else
+ char cctemplate[] = "FILE:/tmp/krb5cc_%d_XXXXXXXXXX";
+#endif
ret = snprintf(ccname, sizeof(ccname),
- "FILE:/tmp/krb5cc_%d_XXXXXXXXXX", geteuid());
+ cctemplate, geteuid());
if (ret < 0 || (size_t)ret >= sizeof(ccname))
return ENOMEM;
+#ifndef USE_CCAPI
old_umask = umask(0177);
tmpfd = mkstemp(ccname + strlen("FILE:"));
oerrno = errno;
@@ -265,6 +276,7 @@ ssh_krb5_cc_gen(krb5_context ctx, krb5_c
return oerrno;
}
close(tmpfd);
+#endif
return (krb5_cc_resolve(ctx, ccname, ccache));
}
Index: openssh-7.9p1/auth.c
===================================================================
--- openssh-7.9p1.orig/auth.c 2019-02-27 15:43:51.228514936 +0100
+++ openssh-7.9p1/auth.c 2019-02-27 15:43:55.360539487 +0100
@@ -399,6 +399,7 @@ auth_root_allowed(struct ssh *ssh, const
case PERMIT_NO_PASSWD:
if (strcmp(method, "publickey") == 0 ||
strcmp(method, "hostbased") == 0 ||
+ strcmp(method, "gssapi-keyex") == 0 ||
strcmp(method, "gssapi-with-mic") == 0)
return 1;
break;
Index: openssh-7.9p1/auth2-gss.c
===================================================================
--- openssh-7.9p1.orig/auth2-gss.c 2018-10-17 02:01:20.000000000 +0200
+++ openssh-7.9p1/auth2-gss.c 2019-02-27 15:43:51.428516125 +0100
@@ -31,6 +31,7 @@
#include <sys/types.h>
#include <stdarg.h>
+#include <string.h>
#include "xmalloc.h"
#include "sshkey.h"
@@ -55,6 +56,44 @@ static int input_gssapi_exchange_complet
static int input_gssapi_errtok(int, u_int32_t, struct ssh *);
/*
+ * The 'gssapi_keyex' userauth mechanism.
+ */
+static int
+userauth_gsskeyex(struct ssh *ssh)
+{
+ Authctxt *authctxt = ssh->authctxt;
+ int authenticated = 0;
+ struct sshbuf *b = NULL;
+ gss_buffer_desc mic, gssbuf;
+ u_int len;
+
+ mic.value = packet_get_string(&len);
+ mic.length = len;
+
+ packet_check_eom();
+
+ if ((b = sshbuf_new()) == NULL)
+ fatal("%s: sshbuf_new failed", __func__);
+
+ ssh_gssapi_buildmic(b, authctxt->user, authctxt->service,
+ "gssapi-keyex");
+
+ gssbuf.value = sshbuf_mutable_ptr(b);
+ gssbuf.length = sshbuf_len(b);
+
+ /* gss_kex_context is NULL with privsep, so we can't check it here */
+ if (!GSS_ERROR(PRIVSEP(ssh_gssapi_checkmic(gss_kex_context,
+ &gssbuf, &mic))))
+ authenticated = PRIVSEP(ssh_gssapi_userok(authctxt->user,
+ authctxt->pw));
+
+ sshbuf_free(b);
+ free(mic.value);
+
+ return (authenticated);
+}
+
+/*
* We only support those mechanisms that we know about (ie ones that we know
* how to check local user kuserok and the like)
*/
@@ -260,7 +299,8 @@ input_gssapi_exchange_complete(int type,
if ((r = sshpkt_get_end(ssh)) != 0)
fatal("%s: %s", __func__, ssh_err(r));
- authenticated = PRIVSEP(ssh_gssapi_userok(authctxt->user));
+ authenticated = PRIVSEP(ssh_gssapi_userok(authctxt->user,
+ authctxt->pw));
if ((!use_privsep || mm_is_monitor()) &&
(displayname = ssh_gssapi_displayname()) != NULL)
@@ -306,7 +346,8 @@ input_gssapi_mic(int type, u_int32_t ple
gssbuf.length = sshbuf_len(b);
if (!GSS_ERROR(PRIVSEP(ssh_gssapi_checkmic(gssctxt, &gssbuf, &mic))))
- authenticated = PRIVSEP(ssh_gssapi_userok(authctxt->user));
+ authenticated =
+ PRIVSEP(ssh_gssapi_userok(authctxt->user, authctxt->pw));
else
logit("GSSAPI MIC check failed");
@@ -326,6 +367,12 @@ input_gssapi_mic(int type, u_int32_t ple
return 0;
}
+Authmethod method_gsskeyex = {
+ "gssapi-keyex",
+ userauth_gsskeyex,
+ &options.gss_authentication
+};
+
Authmethod method_gssapi = {
"gssapi-with-mic",
userauth_gssapi,
Index: openssh-7.9p1/auth2.c
===================================================================
--- openssh-7.9p1.orig/auth2.c 2018-10-17 02:01:20.000000000 +0200
+++ openssh-7.9p1/auth2.c 2019-02-27 15:43:55.360539487 +0100
@@ -74,6 +74,7 @@ extern Authmethod method_passwd;
extern Authmethod method_kbdint;
extern Authmethod method_hostbased;
#ifdef GSSAPI
+extern Authmethod method_gsskeyex;
extern Authmethod method_gssapi;
#endif
@@ -81,6 +82,7 @@ Authmethod *authmethods[] = {
&method_none,
&method_pubkey,
#ifdef GSSAPI
+ &method_gsskeyex,
&method_gssapi,
#endif
&method_passwd,
Index: openssh-7.9p1/clientloop.c
===================================================================
--- openssh-7.9p1.orig/clientloop.c 2018-10-17 02:01:20.000000000 +0200
+++ openssh-7.9p1/clientloop.c 2019-02-27 15:43:51.428516125 +0100
@@ -112,6 +112,10 @@
#include "ssherr.h"
#include "hostfile.h"
+#ifdef GSSAPI
+#include "ssh-gss.h"
+#endif
+
/* import options */
extern Options options;
@@ -1370,9 +1374,18 @@ client_loop(struct ssh *ssh, int have_pt
break;
/* Do channel operations unless rekeying in progress. */
- if (!ssh_packet_is_rekeying(ssh))
+ if (!ssh_packet_is_rekeying(ssh)) {
channel_after_select(ssh, readset, writeset);
+#ifdef GSSAPI
+ if (options.gss_renewal_rekey &&
+ ssh_gssapi_credentials_updated((Gssctxt *)NULL)) {
+ debug("credentials updated - forcing rekey");
+ need_rekeying = 1;
+ }
+#endif
+ }
+
/* Buffer input from the connection. */
client_process_net_input(readset);
Index: openssh-7.9p1/configure.ac
===================================================================
--- openssh-7.9p1.orig/configure.ac 2019-02-27 15:43:51.412516029 +0100
+++ openssh-7.9p1/configure.ac 2019-02-27 15:43:55.192538489 +0100
@@ -664,6 +664,30 @@ main() { if (NSVersionOfRunTimeLibrary("
[Use tunnel device compatibility to OpenBSD])
AC_DEFINE([SSH_TUN_PREPEND_AF], [1],
[Prepend the address family to IP tunnel traffic])
+ AC_MSG_CHECKING(if we have the Security Authorization Session API)
+ AC_TRY_COMPILE([#include <Security/AuthSession.h>],
+ [SessionCreate(0, 0);],
+ [ac_cv_use_security_session_api="yes"
+ AC_DEFINE(USE_SECURITY_SESSION_API, 1,
+ [platform has the Security Authorization Session API])
+ LIBS="$LIBS -framework Security"
+ AC_MSG_RESULT(yes)],
+ [ac_cv_use_security_session_api="no"
+ AC_MSG_RESULT(no)])
+ AC_MSG_CHECKING(if we have an in-memory credentials cache)
+ AC_TRY_COMPILE(
+ [#include <Kerberos/Kerberos.h>],
+ [cc_context_t c;
+ (void) cc_initialize (&c, 0, NULL, NULL);],
+ [AC_DEFINE(USE_CCAPI, 1,
+ [platform uses an in-memory credentials cache])
+ LIBS="$LIBS -framework Security"
+ AC_MSG_RESULT(yes)
+ if test "x$ac_cv_use_security_session_api" = "xno"; then
+ AC_MSG_ERROR(*** Need a security framework to use the credentials cache API ***)
+ fi],
+ [AC_MSG_RESULT(no)]
+ )
m4_pattern_allow([AU_IPv])
AC_CHECK_DECL([AU_IPv4], [],
AC_DEFINE([AU_IPv4], [0], [System only supports IPv4 audit records])
@@ -1844,9 +1868,9 @@ AC_RUN_IFELSE(
)
AC_LINK_IFELSE(
- [AC_LANG_PROGRAM(
- [[ #include <ctype.h> ]],
- [[ return (isblank('a')); ]])],
+ [AC_LANG_PROGRAM(
+ [[ #include <ctype.h> ]],
+ [[ return (isblank('a')); ]])],
[AC_DEFINE([HAVE_ISBLANK], [1], [Define if you have isblank(3C).])
])
@@ -2175,7 +2199,7 @@ int snprintf(char *a, size_t b, const ch
]])],
[AC_MSG_RESULT([yes])
AC_DEFINE([SNPRINTF_CONST], [const],
- [Define as const if snprintf() can declare const char *fmt])],
+ [Define as const if snprintf() can declare const char *fmt])],
[AC_MSG_RESULT([no])
AC_DEFINE([SNPRINTF_CONST], [/* not const */])])
@@ -2190,7 +2214,7 @@ if test "x$ac_cv_func_getpeereid" != "xy
AC_DEFINE([HAVE_SO_PEERCRED], [1], [Have PEERCRED socket option])
], [AC_MSG_RESULT([no])
NO_PEERCHECK=1
- ])
+ ])
fi
dnl see whether mkstemp() requires XXXXXX
@@ -4601,7 +4625,7 @@ AC_ARG_WITH([maildir],
if test "X$withval" != X && test "x$withval" != xno && \
test "x${withval}" != xyes; then
AC_DEFINE_UNQUOTED([MAIL_DIRECTORY], ["$withval"],
- [Set this to your mail directory if you do not have _PATH_MAILDIR])
+ [Set this to your mail directory if you do not have _PATH_MAILDIR])
fi
],[
if test "X$maildir" != "X"; then
Index: openssh-7.9p1/gss-genr.c
===================================================================
--- openssh-7.9p1.orig/gss-genr.c 2018-10-17 02:01:20.000000000 +0200
+++ openssh-7.9p1/gss-genr.c 2019-02-27 15:43:54.528534543 +0100
@@ -41,12 +41,174 @@
#include "sshbuf.h"
#include "log.h"
#include "ssh2.h"
+#include "cipher.h"
+#include "sshkey.h"
+#include "kex.h"
+#include <openssl/evp.h>
#include "ssh-gss.h"
extern u_char *session_id2;
extern u_int session_id2_len;
+typedef struct {
+ char *encoded;
+ gss_OID oid;
+} ssh_gss_kex_mapping;
+
+/*
+ * XXX - It would be nice to find a more elegant way of handling the
+ * XXX passing of the key exchange context to the userauth routines
+ */
+
+Gssctxt *gss_kex_context = NULL;
+
+static ssh_gss_kex_mapping *gss_enc2oid = NULL;
+
+int
+ssh_gssapi_oid_table_ok() {
+ return (gss_enc2oid != NULL);
+}
+
+/*
+ * Return a list of the gss-group1-sha1 mechanisms supported by this program
+ *
+ * We test mechanisms to ensure that we can use them, to avoid starting
+ * a key exchange with a bad mechanism
+ */
+
+char *
+ssh_gssapi_client_mechanisms(const char *host, const char *client,
+ const char *kex) {
+ gss_OID_set gss_supported;
+ OM_uint32 min_status;
+
+ if (GSS_ERROR(gss_indicate_mechs(&min_status, &gss_supported)))
+ return NULL;
+
+ return(ssh_gssapi_kex_mechs(gss_supported, ssh_gssapi_check_mechanism,
+ host, client));
+}
+
+char *
+ssh_gssapi_kex_mechs(gss_OID_set gss_supported, ssh_gssapi_check_fn *check,
+ const char *host, const char *client) {
+ struct sshbuf *buf;
+ size_t i;
+ int oidpos, enclen, r;
+ char *mechs, *encoded;
+ u_char digest[EVP_MAX_MD_SIZE];
+ char deroid[2];
+ const EVP_MD *evp_md = EVP_md5();
+ EVP_MD_CTX *md;
+
+ if (gss_enc2oid != NULL) {
+ for (i = 0; gss_enc2oid[i].encoded != NULL; i++)
+ free(gss_enc2oid[i].encoded);
+ free(gss_enc2oid);
+ }
+
+ gss_enc2oid = xmalloc(sizeof(ssh_gss_kex_mapping) *
+ (gss_supported->count + 1));
+
+ if ((buf = sshbuf_new()) == NULL)
+ fatal("%s: sshbuf_new failed", __func__);
+
+ md = EVP_MD_CTX_new();
+ oidpos = 0;
+ for (i = 0; i < gss_supported->count; i++) {
+ if (gss_supported->elements[i].length < 128 &&
+ (*check)(NULL, &(gss_supported->elements[i]), host, client)) {
+
+ deroid[0] = SSH_GSS_OIDTYPE;
+ deroid[1] = gss_supported->elements[i].length;
+
+ EVP_DigestInit(md, evp_md);
+ EVP_DigestUpdate(md, deroid, 2);
+ EVP_DigestUpdate(md,
+ gss_supported->elements[i].elements,
+ gss_supported->elements[i].length);
+ EVP_DigestFinal(md, digest, NULL);
+
+ encoded = xmalloc(EVP_MD_size(evp_md) * 2);
+ enclen = __b64_ntop(digest, EVP_MD_size(evp_md),
+ encoded, EVP_MD_size(evp_md) * 2);
+
+ if (oidpos != 0)
+ if ((r = sshbuf_put_u8(buf, ',')) != 0)
+ fatal("%s: buffer error: %s", __func__, ssh_err(r));
+
+ if ((r = sshbuf_put(buf, KEX_GSS_GEX_SHA1_ID,
+ sizeof(KEX_GSS_GEX_SHA1_ID) - 1)) != 0 ||
+ (r = sshbuf_put(buf, encoded, enclen)) != 0 ||
+ (r = sshbuf_put_u8(buf, ',')) != 0 ||
+ (r = sshbuf_put(buf, KEX_GSS_GRP1_SHA1_ID,
+ sizeof(KEX_GSS_GRP1_SHA1_ID) - 1)) != 0 ||
+ (r = sshbuf_put(buf, encoded, enclen)) != 0 ||
+ (r = sshbuf_put_u8(buf, ',')) != 0 ||
+ (r = sshbuf_put(buf, KEX_GSS_GRP14_SHA1_ID,
+ sizeof(KEX_GSS_GRP14_SHA1_ID) - 1)) != 0 ||
+ (r = sshbuf_put(buf, encoded, enclen)) != 0)
+ fatal("%s: buffer error: %s", __func__, ssh_err(r));
+
+ gss_enc2oid[oidpos].oid = &(gss_supported->elements[i]);
+ gss_enc2oid[oidpos].encoded = encoded;
+ oidpos++;
+ }
+ }
+ EVP_MD_CTX_free(md);
+ gss_enc2oid[oidpos].oid = NULL;
+ gss_enc2oid[oidpos].encoded = NULL;
+
+ if ((r = sshbuf_put_u8(buf, '\0')) != 0)
+ fatal("%s: buffer error: %s", __func__, ssh_err(r));
+
+ mechs = xmalloc(sshbuf_len(buf));
+ sshbuf_get(buf, mechs, sshbuf_len(buf));
+ sshbuf_free(buf);
+
+ if (strlen(mechs) == 0) {
+ free(mechs);
+ mechs = NULL;
+ }
+
+ return (mechs);
+}
+
+gss_OID
+ssh_gssapi_id_kex(Gssctxt *ctx, char *name, int kex_type) {
+ int i = 0;
+
+ switch (kex_type) {
+ case KEX_GSS_GRP1_SHA1:
+ if (strlen(name) < sizeof(KEX_GSS_GRP1_SHA1_ID))
+ return GSS_C_NO_OID;
+ name += sizeof(KEX_GSS_GRP1_SHA1_ID) - 1;
+ break;
+ case KEX_GSS_GRP14_SHA1:
+ if (strlen(name) < sizeof(KEX_GSS_GRP14_SHA1_ID))
+ return GSS_C_NO_OID;
+ name += sizeof(KEX_GSS_GRP14_SHA1_ID) - 1;
+ break;
+ case KEX_GSS_GEX_SHA1:
+ if (strlen(name) < sizeof(KEX_GSS_GEX_SHA1_ID))
+ return GSS_C_NO_OID;
+ name += sizeof(KEX_GSS_GEX_SHA1_ID) - 1;
+ break;
+ default:
+ return GSS_C_NO_OID;
+ }
+
+ while (gss_enc2oid[i].encoded != NULL &&
+ strcmp(name, gss_enc2oid[i].encoded) != 0)
+ i++;
+
+ if (gss_enc2oid[i].oid != NULL && ctx != NULL)
+ ssh_gssapi_set_oid(ctx, gss_enc2oid[i].oid);
+
+ return gss_enc2oid[i].oid;
+}
+
/* sshbuf_get for gss_buffer_desc */
int
ssh_gssapi_get_buffer_desc(struct sshbuf *b, gss_buffer_desc *g)
@@ -218,7 +380,7 @@ ssh_gssapi_init_ctx(Gssctxt *ctx, int de
}
ctx->major = gss_init_sec_context(&ctx->minor,
- GSS_C_NO_CREDENTIAL, &ctx->context, ctx->name, ctx->oid,
+ ctx->client_creds, &ctx->context, ctx->name, ctx->oid,
GSS_C_MUTUAL_FLAG | GSS_C_INTEG_FLAG | deleg_flag,
0, NULL, recv_tok, NULL, send_tok, flags, NULL);
@@ -248,8 +410,42 @@ ssh_gssapi_import_name(Gssctxt *ctx, con
}
OM_uint32
+ssh_gssapi_client_identity(Gssctxt *ctx, const char *name)
+{
+ gss_buffer_desc gssbuf;
+ gss_name_t gssname;
+ OM_uint32 status;
+ gss_OID_set oidset;
+
+ gssbuf.value = (void *) name;
+ gssbuf.length = strlen(gssbuf.value);
+
+ gss_create_empty_oid_set(&status, &oidset);
+ gss_add_oid_set_member(&status, ctx->oid, &oidset);
+
+ ctx->major = gss_import_name(&ctx->minor, &gssbuf,
+ GSS_C_NT_USER_NAME, &gssname);
+
+ if (!ctx->major)
+ ctx->major = gss_acquire_cred(&ctx->minor,
+ gssname, 0, oidset, GSS_C_INITIATE,
+ &ctx->client_creds, NULL, NULL);
+
+ gss_release_name(&status, &gssname);
+ gss_release_oid_set(&status, &oidset);
+
+ if (ctx->major)
+ ssh_gssapi_error(ctx);
+
+ return(ctx->major);
+}
+
+OM_uint32
ssh_gssapi_sign(Gssctxt *ctx, gss_buffer_t buffer, gss_buffer_t hash)
{
+ if (ctx == NULL)
+ return -1;
+
if ((ctx->major = gss_get_mic(&ctx->minor, ctx->context,
GSS_C_QOP_DEFAULT, buffer, hash)))
ssh_gssapi_error(ctx);
@@ -257,6 +453,19 @@ ssh_gssapi_sign(Gssctxt *ctx, gss_buffer
return (ctx->major);
}
+/* Priviledged when used by server */
+OM_uint32
+ssh_gssapi_checkmic(Gssctxt *ctx, gss_buffer_t gssbuf, gss_buffer_t gssmic)
+{
+ if (ctx == NULL)
+ return -1;
+
+ ctx->major = gss_verify_mic(&ctx->minor, ctx->context,
+ gssbuf, gssmic, NULL);
+
+ return (ctx->major);
+}
+
void
ssh_gssapi_buildmic(struct sshbuf *b, const char *user, const char *service,
const char *context)
@@ -273,22 +482,31 @@ ssh_gssapi_buildmic(struct sshbuf *b, co
}
int
-ssh_gssapi_check_mechanism(Gssctxt **ctx, gss_OID oid, const char *host)
+ssh_gssapi_check_mechanism(Gssctxt **ctx, gss_OID oid, const char *host,
+ const char *client)
{
gss_buffer_desc token = GSS_C_EMPTY_BUFFER;
OM_uint32 major, minor;
gss_OID_desc spnego_oid = {6, (void *)"\x2B\x06\x01\x05\x05\x02"};
+ Gssctxt *intctx = NULL;
+
+ if (ctx == NULL)
+ ctx = &intctx;
/* RFC 4462 says we MUST NOT do SPNEGO */
- if (oid->length == spnego_oid.length &&
+ if (oid->length == spnego_oid.length &&
(memcmp(oid->elements, spnego_oid.elements, oid->length) == 0))
return 0; /* false */
ssh_gssapi_build_ctx(ctx);
ssh_gssapi_set_oid(*ctx, oid);
major = ssh_gssapi_import_name(*ctx, host);
+
+ if (!GSS_ERROR(major) && client)
+ major = ssh_gssapi_client_identity(*ctx, client);
+
if (!GSS_ERROR(major)) {
- major = ssh_gssapi_init_ctx(*ctx, 0, GSS_C_NO_BUFFER, &token,
+ major = ssh_gssapi_init_ctx(*ctx, 0, GSS_C_NO_BUFFER, &token,
NULL);
gss_release_buffer(&minor, &token);
if ((*ctx)->context != GSS_C_NO_CONTEXT)
@@ -296,10 +514,66 @@ ssh_gssapi_check_mechanism(Gssctxt **ctx
GSS_C_NO_BUFFER);
}
- if (GSS_ERROR(major))
+ if (GSS_ERROR(major) || intctx != NULL)
ssh_gssapi_delete_ctx(ctx);
return (!GSS_ERROR(major));
}
+int
+ssh_gssapi_credentials_updated(Gssctxt *ctxt) {
+ static gss_name_t saved_name = GSS_C_NO_NAME;
+ static OM_uint32 saved_lifetime = 0;
+ static gss_OID saved_mech = GSS_C_NO_OID;
+ static gss_name_t name;
+ static OM_uint32 last_call = 0;
+ OM_uint32 lifetime, now, major, minor;
+ int equal;
+
+ now = time(NULL);
+
+ if (ctxt) {
+ debug("Rekey has happened - updating saved versions");
+
+ if (saved_name != GSS_C_NO_NAME)
+ gss_release_name(&minor, &saved_name);
+
+ major = gss_inquire_cred(&minor, GSS_C_NO_CREDENTIAL,
+ &saved_name, &saved_lifetime, NULL, NULL);
+
+ if (!GSS_ERROR(major)) {
+ saved_mech = ctxt->oid;
+ saved_lifetime+= now;
+ } else {
+ /* Handle the error */
+ }
+ return 0;
+ }
+
+ if (now - last_call < 10)
+ return 0;
+
+ last_call = now;
+
+ if (saved_mech == GSS_C_NO_OID)
+ return 0;
+
+ major = gss_inquire_cred(&minor, GSS_C_NO_CREDENTIAL,
+ &name, &lifetime, NULL, NULL);
+ if (major == GSS_S_CREDENTIALS_EXPIRED)
+ return 0;
+ else if (GSS_ERROR(major))
+ return 0;
+
+ major = gss_compare_name(&minor, saved_name, name, &equal);
+ gss_release_name(&minor, &name);
+ if (GSS_ERROR(major))
+ return 0;
+
+ if (equal && (saved_lifetime < lifetime + now - 10))
+ return 1;
+
+ return 0;
+}
+
#endif /* GSSAPI */
Index: openssh-7.9p1/gss-serv-krb5.c
===================================================================
--- openssh-7.9p1.orig/gss-serv-krb5.c 2018-10-17 02:01:20.000000000 +0200
+++ openssh-7.9p1/gss-serv-krb5.c 2019-02-27 15:43:51.432516148 +0100
@@ -120,7 +120,7 @@ ssh_gssapi_krb5_storecreds(ssh_gssapi_cl
krb5_error_code problem;
krb5_principal princ;
OM_uint32 maj_status, min_status;
- int len;
+ const char *new_ccname, *new_cctype;
const char *errmsg;
if (client->creds == NULL) {
@@ -180,11 +180,23 @@ ssh_gssapi_krb5_storecreds(ssh_gssapi_cl
return;
}
- client->store.filename = xstrdup(krb5_cc_get_name(krb_context, ccache));
+ new_cctype = krb5_cc_get_type(krb_context, ccache);
+ new_ccname = krb5_cc_get_name(krb_context, ccache);
+
client->store.envvar = "KRB5CCNAME";
- len = strlen(client->store.filename) + 6;
- client->store.envval = xmalloc(len);
- snprintf(client->store.envval, len, "FILE:%s", client->store.filename);
+#ifdef USE_CCAPI
+ xasprintf(&client->store.envval, "API:%s", new_ccname);
+#else
+ if (new_ccname[0] == ':')
+ new_ccname++;
+ xasprintf(&client->store.envval, "%s:%s", new_cctype, new_ccname);
+ if (strcmp(new_cctype, "DIR") == 0) {
+ char *p;
+ p = strrchr(client->store.envval, '/');
+ if (p)
+ *p = '\0';
+ }
+#endif
#ifdef USE_PAM
if (options.use_pam)
@@ -193,9 +205,76 @@ ssh_gssapi_krb5_storecreds(ssh_gssapi_cl
krb5_cc_close(krb_context, ccache);
+ client->store.data = krb_context;
+
return;
}
+int
+ssh_gssapi_krb5_updatecreds(ssh_gssapi_ccache *store,
+ ssh_gssapi_client *client)
+{
+ krb5_ccache ccache = NULL;
+ krb5_principal principal = NULL;
+ char *name = NULL;
+ krb5_error_code problem;
+ OM_uint32 maj_status, min_status;
+
+ if ((problem = krb5_cc_resolve(krb_context, store->envval, &ccache))) {
+ logit("krb5_cc_resolve(): %.100s",
+ krb5_get_err_text(krb_context, problem));
+ return 0;
+ }
+
+ /* Find out who the principal in this cache is */
+ if ((problem = krb5_cc_get_principal(krb_context, ccache,
+ &principal))) {
+ logit("krb5_cc_get_principal(): %.100s",
+ krb5_get_err_text(krb_context, problem));
+ krb5_cc_close(krb_context, ccache);
+ return 0;
+ }
+
+ if ((problem = krb5_unparse_name(krb_context, principal, &name))) {
+ logit("krb5_unparse_name(): %.100s",
+ krb5_get_err_text(krb_context, problem));
+ krb5_free_principal(krb_context, principal);
+ krb5_cc_close(krb_context, ccache);
+ return 0;
+ }
+
+
+ if (strcmp(name,client->exportedname.value)!=0) {
+ debug("Name in local credentials cache differs. Not storing");
+ krb5_free_principal(krb_context, principal);
+ krb5_cc_close(krb_context, ccache);
+ krb5_free_unparsed_name(krb_context, name);
+ return 0;
+ }
+ krb5_free_unparsed_name(krb_context, name);
+
+ /* Name matches, so lets get on with it! */
+
+ if ((problem = krb5_cc_initialize(krb_context, ccache, principal))) {
+ logit("krb5_cc_initialize(): %.100s",
+ krb5_get_err_text(krb_context, problem));
+ krb5_free_principal(krb_context, principal);
+ krb5_cc_close(krb_context, ccache);
+ return 0;
+ }
+
+ krb5_free_principal(krb_context, principal);
+
+ if ((maj_status = gss_krb5_copy_ccache(&min_status, client->creds,
+ ccache))) {
+ logit("gss_krb5_copy_ccache() failed. Sorry!");
+ krb5_cc_close(krb_context, ccache);
+ return 0;
+ }
+
+ return 1;
+}
+
ssh_gssapi_mech gssapi_kerberos_mech = {
"toWM5Slw5Ew8Mqkay+al2g==",
"Kerberos",
@@ -203,7 +282,8 @@ ssh_gssapi_mech gssapi_kerberos_mech = {
NULL,
&ssh_gssapi_krb5_userok,
NULL,
- &ssh_gssapi_krb5_storecreds
+ &ssh_gssapi_krb5_storecreds,
+ &ssh_gssapi_krb5_updatecreds
};
#endif /* KRB5 */
Index: openssh-7.9p1/gss-serv.c
===================================================================
--- openssh-7.9p1.orig/gss-serv.c 2018-10-17 02:01:20.000000000 +0200
+++ openssh-7.9p1/gss-serv.c 2019-02-27 15:43:51.432516148 +0100
@@ -44,17 +44,19 @@
#include "session.h"
#include "misc.h"
#include "servconf.h"
+#include "uidswap.h"
#include "ssh-gss.h"
+#include "monitor_wrap.h"
extern ServerOptions options;
static ssh_gssapi_client gssapi_client =
{ GSS_C_EMPTY_BUFFER, GSS_C_EMPTY_BUFFER,
- GSS_C_NO_CREDENTIAL, NULL, {NULL, NULL, NULL, NULL}};
+ GSS_C_NO_CREDENTIAL, GSS_C_NO_NAME, NULL, {NULL, NULL, NULL, NULL}, 0, 0};
ssh_gssapi_mech gssapi_null_mech =
- { NULL, NULL, {0, NULL}, NULL, NULL, NULL, NULL};
+ { NULL, NULL, {0, NULL}, NULL, NULL, NULL, NULL, NULL};
#ifdef KRB5
extern ssh_gssapi_mech gssapi_kerberos_mech;
@@ -141,6 +143,28 @@ ssh_gssapi_server_ctx(Gssctxt **ctx, gss
}
/* Unprivileged */
+char *
+ssh_gssapi_server_mechanisms() {
+ if (supported_oids == NULL)
+ ssh_gssapi_prepare_supported_oids();
+ return (ssh_gssapi_kex_mechs(supported_oids,
+ &ssh_gssapi_server_check_mech, NULL, NULL));
+}
+
+/* Unprivileged */
+int
+ssh_gssapi_server_check_mech(Gssctxt **dum, gss_OID oid, const char *data,
+ const char *dummy) {
+ Gssctxt *ctx = NULL;
+ int res;
+
+ res = !GSS_ERROR(PRIVSEP(ssh_gssapi_server_ctx(&ctx, oid)));
+ ssh_gssapi_delete_ctx(&ctx);
+
+ return (res);
+}
+
+/* Unprivileged */
void
ssh_gssapi_supported_oids(gss_OID_set *oidset)
{
@@ -150,7 +174,9 @@ ssh_gssapi_supported_oids(gss_OID_set *o
gss_OID_set supported;
gss_create_empty_oid_set(&min_status, oidset);
- gss_indicate_mechs(&min_status, &supported);
+
+ if (GSS_ERROR(gss_indicate_mechs(&min_status, &supported)))
+ return;
while (supported_mechs[i]->name != NULL) {
if (GSS_ERROR(gss_test_oid_set_member(&min_status,
@@ -276,8 +302,48 @@ OM_uint32
ssh_gssapi_getclient(Gssctxt *ctx, ssh_gssapi_client *client)
{
int i = 0;
+ int equal = 0;
+ gss_name_t new_name = GSS_C_NO_NAME;
+ gss_buffer_desc ename = GSS_C_EMPTY_BUFFER;
+
+ if (options.gss_store_rekey && client->used && ctx->client_creds) {
+ if (client->mech->oid.length != ctx->oid->length ||
+ (memcmp(client->mech->oid.elements,
+ ctx->oid->elements, ctx->oid->length) !=0)) {
+ debug("Rekeyed credentials have different mechanism");
+ return GSS_S_COMPLETE;
+ }
- gss_buffer_desc ename;
+ if ((ctx->major = gss_inquire_cred_by_mech(&ctx->minor,
+ ctx->client_creds, ctx->oid, &new_name,
+ NULL, NULL, NULL))) {
+ ssh_gssapi_error(ctx);
+ return (ctx->major);
+ }
+
+ ctx->major = gss_compare_name(&ctx->minor, client->name,
+ new_name, &equal);
+
+ if (GSS_ERROR(ctx->major)) {
+ ssh_gssapi_error(ctx);
+ return (ctx->major);
+ }
+
+ if (!equal) {
+ debug("Rekeyed credentials have different name");
+ return GSS_S_COMPLETE;
+ }
+
+ debug("Marking rekeyed credentials for export");
+
+ gss_release_name(&ctx->minor, &client->name);
+ gss_release_cred(&ctx->minor, &client->creds);
+ client->name = new_name;
+ client->creds = ctx->client_creds;
+ ctx->client_creds = GSS_C_NO_CREDENTIAL;
+ client->updated = 1;
+ return GSS_S_COMPLETE;
+ }
client->mech = NULL;
@@ -292,6 +358,13 @@ ssh_gssapi_getclient(Gssctxt *ctx, ssh_g
if (client->mech == NULL)
return GSS_S_FAILURE;
+ if (ctx->client_creds &&
+ (ctx->major = gss_inquire_cred_by_mech(&ctx->minor,
+ ctx->client_creds, ctx->oid, &client->name, NULL, NULL, NULL))) {
+ ssh_gssapi_error(ctx);
+ return (ctx->major);
+ }
+
if ((ctx->major = gss_display_name(&ctx->minor, ctx->client,
&client->displayname, NULL))) {
ssh_gssapi_error(ctx);
@@ -309,6 +382,8 @@ ssh_gssapi_getclient(Gssctxt *ctx, ssh_g
return (ctx->major);
}
+ gss_release_buffer(&ctx->minor, &ename);
+
/* We can't copy this structure, so we just move the pointer to it */
client->creds = ctx->client_creds;
ctx->client_creds = GSS_C_NO_CREDENTIAL;
@@ -319,11 +394,20 @@ ssh_gssapi_getclient(Gssctxt *ctx, ssh_g
void
ssh_gssapi_cleanup_creds(void)
{
- if (gssapi_client.store.filename != NULL) {
- /* Unlink probably isn't sufficient */
- debug("removing gssapi cred file\"%s\"",
- gssapi_client.store.filename);
- unlink(gssapi_client.store.filename);
+ krb5_ccache ccache = NULL;
+ krb5_error_code problem;
+
+ if (gssapi_client.store.data != NULL) {
+ if ((problem = krb5_cc_resolve(gssapi_client.store.data, gssapi_client.store.envval, &ccache))) {
+ debug("%s: krb5_cc_resolve(): %.100s", __func__,
+ krb5_get_err_text(gssapi_client.store.data, problem));
+ } else if ((problem = krb5_cc_destroy(gssapi_client.store.data, ccache))) {
+ debug("%s: krb5_cc_resolve(): %.100s", __func__,
+ krb5_get_err_text(gssapi_client.store.data, problem));
+ } else {
+ krb5_free_context(gssapi_client.store.data);
+ gssapi_client.store.data = NULL;
+ }
}
}
@@ -356,7 +440,7 @@ ssh_gssapi_do_child(char ***envp, u_int
/* Privileged */
int
-ssh_gssapi_userok(char *user)
+ssh_gssapi_userok(char *user, struct passwd *pw)
{
OM_uint32 lmin;
@@ -366,9 +450,11 @@ ssh_gssapi_userok(char *user)
return 0;
}
if (gssapi_client.mech && gssapi_client.mech->userok)
- if ((*gssapi_client.mech->userok)(&gssapi_client, user))
+ if ((*gssapi_client.mech->userok)(&gssapi_client, user)) {
+ gssapi_client.used = 1;
+ gssapi_client.store.owner = pw;
return 1;
- else {
+ } else {
/* Destroy delegated credentials if userok fails */
gss_release_buffer(&lmin, &gssapi_client.displayname);
gss_release_buffer(&lmin, &gssapi_client.exportedname);
@@ -382,14 +468,90 @@ ssh_gssapi_userok(char *user)
return (0);
}
-/* Privileged */
-OM_uint32
-ssh_gssapi_checkmic(Gssctxt *ctx, gss_buffer_t gssbuf, gss_buffer_t gssmic)
+/* These bits are only used for rekeying. The unpriviledged child is running
+ * as the user, the monitor is root.
+ *
+ * In the child, we want to :
+ * *) Ask the monitor to store our credentials into the store we specify
+ * *) If it succeeds, maybe do a PAM update
+ */
+
+/* Stuff for PAM */
+
+#ifdef USE_PAM
+static int ssh_gssapi_simple_conv(int n, const struct pam_message **msg,
+ struct pam_response **resp, void *data)
{
- ctx->major = gss_verify_mic(&ctx->minor, ctx->context,
- gssbuf, gssmic, NULL);
+ return (PAM_CONV_ERR);
+}
+#endif
- return (ctx->major);
+void
+ssh_gssapi_rekey_creds() {
+ int ok;
+ int ret;
+#ifdef USE_PAM
+ pam_handle_t *pamh = NULL;
+ struct pam_conv pamconv = {ssh_gssapi_simple_conv, NULL};
+ char *envstr;
+#endif
+
+ if (gssapi_client.store.filename == NULL &&
+ gssapi_client.store.envval == NULL &&
+ gssapi_client.store.envvar == NULL)
+ return;
+
+ ok = PRIVSEP(ssh_gssapi_update_creds(&gssapi_client.store));
+
+ if (!ok)
+ return;
+
+ debug("Rekeyed credentials stored successfully");
+
+ /* Actually managing to play with the ssh pam stack from here will
+ * be next to impossible. In any case, we may want different options
+ * for rekeying. So, use our own :)
+ */
+#ifdef USE_PAM
+ if (!use_privsep) {
+ debug("Not even going to try and do PAM with privsep disabled");
+ return;
+ }
+
+ ret = pam_start("sshd-rekey", gssapi_client.store.owner->pw_name,
+ &pamconv, &pamh);
+ if (ret)
+ return;
+
+ xasprintf(&envstr, "%s=%s", gssapi_client.store.envvar,
+ gssapi_client.store.envval);
+
+ ret = pam_putenv(pamh, envstr);
+ if (!ret)
+ pam_setcred(pamh, PAM_REINITIALIZE_CRED);
+ pam_end(pamh, PAM_SUCCESS);
+#endif
+}
+
+int
+ssh_gssapi_update_creds(ssh_gssapi_ccache *store) {
+ int ok = 0;
+
+ /* Check we've got credentials to store */
+ if (!gssapi_client.updated)
+ return 0;
+
+ gssapi_client.updated = 0;
+
+ temporarily_use_uid(gssapi_client.store.owner);
+ if (gssapi_client.mech && gssapi_client.mech->updatecreds)
+ ok = (*gssapi_client.mech->updatecreds)(store, &gssapi_client);
+ else
+ debug("No update function for this mechanism");
+
+ restore_uid();
+
+ return ok;
}
/* Privileged */
Index: openssh-7.9p1/kex.c
===================================================================
--- openssh-7.9p1.orig/kex.c 2019-02-27 15:43:51.296515340 +0100
+++ openssh-7.9p1/kex.c 2019-02-27 15:43:55.360539487 +0100
@@ -56,6 +56,10 @@
#include "fips.h"
+#ifdef GSSAPI
+#include "ssh-gss.h"
+#endif
+
/* prototype */
static int kex_choose_conf(struct ssh *);
static int kex_input_newkeys(int, u_int32_t, struct ssh *);
@@ -105,6 +109,11 @@ static const struct kexalg kexalgs_all[]
{ KEX_CURVE25519_SHA256, KEX_C25519_SHA256, 0, SSH_DIGEST_SHA256 },
{ KEX_CURVE25519_SHA256_OLD, KEX_C25519_SHA256, 0, SSH_DIGEST_SHA256 },
#endif /* HAVE_EVP_SHA256 || !WITH_OPENSSL */
+#ifdef GSSAPI
+ { KEX_GSS_GEX_SHA1_ID, KEX_GSS_GEX_SHA1, 0, SSH_DIGEST_SHA1 },
+ { KEX_GSS_GRP1_SHA1_ID, KEX_GSS_GRP1_SHA1, 0, SSH_DIGEST_SHA1 },
+ { KEX_GSS_GRP14_SHA1_ID, KEX_GSS_GRP14_SHA1, 0, SSH_DIGEST_SHA1 },
+#endif
{ NULL, -1, -1, -1},
};
@@ -129,6 +138,10 @@ static const struct kexalg kexalgs_fips1
# endif /* OPENSSL_HAS_NISTP521 */
#endif /* OPENSSL_HAS_ECC */
#endif /* WITH_OPENSSL */
+#ifdef GSSAPI
+ { KEX_GSS_GEX_SHA1_ID, KEX_GSS_GEX_SHA1, 0, SSH_DIGEST_SHA1 },
+ { KEX_GSS_GRP14_SHA1_ID, KEX_GSS_GRP14_SHA1, 0, SSH_DIGEST_SHA1 },
+#endif
{ NULL, -1, -1, -1},
};
@@ -179,6 +192,12 @@ kex_alg_by_name(const char *name)
for (k = fips_select_kexalgs(); k->name != NULL; k++) {
if (strcmp(k->name, name) == 0)
return k;
+#ifdef GSSAPI
+ if (strncmp(name, "gss-", 4) == 0) {
+ if (strncmp(k->name, name, strlen(k->name)) == 0)
+ return k;
+ }
+#endif
}
return NULL;
}
Index: openssh-7.9p1/kex.h
===================================================================
--- openssh-7.9p1.orig/kex.h 2018-10-17 02:01:20.000000000 +0200
+++ openssh-7.9p1/kex.h 2019-02-27 15:43:55.360539487 +0100
@@ -100,6 +100,11 @@ enum kex_exchange {
KEX_DH_GEX_SHA256,
KEX_ECDH_SHA2,
KEX_C25519_SHA256,
+#ifdef GSSAPI
+ KEX_GSS_GRP1_SHA1,
+ KEX_GSS_GRP14_SHA1,
+ KEX_GSS_GEX_SHA1,
+#endif
KEX_MAX
};
@@ -148,6 +153,12 @@ struct kex {
u_int flags;
int hash_alg;
int ec_nid;
+#ifdef GSSAPI
+ int gss_deleg_creds;
+ int gss_trust_dns;
+ char *gss_host;
+ char *gss_client;
+#endif
char *client_version_string;
char *server_version_string;
char *failed_choice;
@@ -197,6 +208,10 @@ int kexecdh_client(struct ssh *);
int kexecdh_server(struct ssh *);
int kexc25519_client(struct ssh *);
int kexc25519_server(struct ssh *);
+#ifdef GSSAPI
+int kexgss_client(struct ssh *);
+int kexgss_server(struct ssh *);
+#endif
int kex_dh_hash(int, const char *, const char *,
const u_char *, size_t, const u_char *, size_t, const u_char *, size_t,
Index: openssh-7.9p1/kexgssc.c
===================================================================
--- /dev/null 1970-01-01 00:00:00.000000000 +0000
+++ openssh-7.9p1/kexgssc.c 2019-02-27 15:44:14.792654941 +0100
@@ -0,0 +1,346 @@
+/*
+ * Copyright (c) 2001-2009 Simon Wilkinson. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR `AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "includes.h"
+
+#ifdef GSSAPI
+
+#include "includes.h"
+
+#include <openssl/crypto.h>
+#include <openssl/bn.h>
+
+#include <string.h>
+
+#include "xmalloc.h"
+#include "sshbuf.h"
+#include "ssh2.h"
+#include "sshkey.h"
+#include "cipher.h"
+#include "kex.h"
+#include "log.h"
+#include "packet.h"
+#include "dh.h"
+#include "digest.h"
+
+#include "ssh-gss.h"
+
+#include "fips.h"
+
+int
+kexgss_client(struct ssh *ssh)
+{
+ gss_buffer_desc send_tok = GSS_C_EMPTY_BUFFER;
+ gss_buffer_desc recv_tok, gssbuf, msg_tok, *token_ptr;
+ Gssctxt *ctxt;
+ OM_uint32 maj_status, min_status, ret_flags;
+ u_int klen, kout, slen = 0, strlen;
+ DH *dh;
+ BIGNUM *dh_server_pub = NULL;
+ BIGNUM *shared_secret = NULL;
+ BIGNUM *p = NULL;
+ BIGNUM *g = NULL;
+ const BIGNUM *pub_key, *p1, *g1;
+ u_char *kbuf;
+ u_char *serverhostkey = NULL;
+ u_char *empty = "";
+ char *msg;
+ char *lang;
+ int type = 0;
+ int first = 1;
+ int nbits = 0, min = DH_GRP_MIN, max = DH_GRP_MAX;
+ u_char hash[SSH_DIGEST_MAX_LENGTH];
+ size_t hashlen;
+
+ /* Initialise our GSSAPI world */
+ ssh_gssapi_build_ctx(&ctxt);
+ if (ssh_gssapi_id_kex(ctxt, ssh->kex->name, ssh->kex->kex_type)
+ == GSS_C_NO_OID)
+ fatal("Couldn't identify host exchange");
+
+ if (ssh_gssapi_import_name(ctxt, ssh->kex->gss_host))
+ fatal("Couldn't import hostname");
+
+ if (ssh->kex->gss_client &&
+ ssh_gssapi_client_identity(ctxt, ssh->kex->gss_client))
+ fatal("Couldn't acquire client credentials");
+
+ switch (ssh->kex->kex_type) {
+ case KEX_GSS_GRP1_SHA1:
+ dh = dh_new_group1();
+ break;
+ case KEX_GSS_GRP14_SHA1:
+ dh = dh_new_group14();
+ break;
+ case KEX_GSS_GEX_SHA1:
+ debug("Doing group exchange\n");
+ nbits = dh_estimate(ssh->kex->we_need * 8);
+ packet_start(SSH2_MSG_KEXGSS_GROUPREQ);
+ packet_put_int(min);
+ packet_put_int(nbits);
+ packet_put_int(max);
+
+ packet_send();
+
+ packet_read_expect(SSH2_MSG_KEXGSS_GROUP);
+
+ if ((p = BN_new()) == NULL)
+ fatal("BN_new() failed");
+ packet_get_bignum2(p);
+ if ((g = BN_new()) == NULL)
+ fatal("BN_new() failed");
+ packet_get_bignum2(g);
+ packet_check_eom();
+
+ if (BN_num_bits(p) < min || BN_num_bits(p) > max)
+ fatal("GSSGRP_GEX group out of range: %d !< %d !< %d",
+ min, BN_num_bits(p), max);
+
+ dh = dh_new_group(g, p);
+ break;
+ default:
+ fatal("%s: Unexpected KEX type %d", __func__, ssh->kex->kex_type);
+ }
+
+ /* Step 1 - e is pub_key */
+ dh_gen_key(dh, ssh->kex->we_need * 8);
+ DH_get0_key(dh, &pub_key, NULL);
+
+ /* This is f, we initialise it now to make life easier */
+ dh_server_pub = BN_new();
+ if (dh_server_pub == NULL)
+ fatal("dh_server_pub == NULL");
+
+ token_ptr = GSS_C_NO_BUFFER;
+
+ do {
+ debug("Calling gss_init_sec_context");
+
+ maj_status = ssh_gssapi_init_ctx(ctxt,
+ ssh->kex->gss_deleg_creds, token_ptr, &send_tok,
+ &ret_flags);
+
+ if (GSS_ERROR(maj_status)) {
+ if (send_tok.length != 0) {
+ packet_start(SSH2_MSG_KEXGSS_CONTINUE);
+ packet_put_string(send_tok.value,
+ send_tok.length);
+ }
+ fatal("gss_init_context failed");
+ }
+
+ /* If we've got an old receive buffer get rid of it */
+ if (token_ptr != GSS_C_NO_BUFFER)
+ free(recv_tok.value);
+
+ if (maj_status == GSS_S_COMPLETE) {
+ /* If mutual state flag is not true, kex fails */
+ if (!(ret_flags & GSS_C_MUTUAL_FLAG))
+ fatal("Mutual authentication failed");
+
+ /* If integ avail flag is not true kex fails */
+ if (!(ret_flags & GSS_C_INTEG_FLAG))
+ fatal("Integrity check failed");
+ }
+
+ /*
+ * If we have data to send, then the last message that we
+ * received cannot have been a 'complete'.
+ */
+ if (send_tok.length != 0) {
+ if (first) {
+ packet_start(SSH2_MSG_KEXGSS_INIT);
+ packet_put_string(send_tok.value,
+ send_tok.length);
+ packet_put_bignum2((BIGNUM *)pub_key);
+ first = 0;
+ } else {
+ packet_start(SSH2_MSG_KEXGSS_CONTINUE);
+ packet_put_string(send_tok.value,
+ send_tok.length);
+ }
+ packet_send();
+ gss_release_buffer(&min_status, &send_tok);
+
+ /* If we've sent them data, they should reply */
+ do {
+ type = packet_read();
+ if (type == SSH2_MSG_KEXGSS_HOSTKEY) {
+ debug("Received KEXGSS_HOSTKEY");
+ if (serverhostkey)
+ fatal("Server host key received more than once");
+ serverhostkey =
+ packet_get_string(&slen);
+ }
+ } while (type == SSH2_MSG_KEXGSS_HOSTKEY);
+
+ switch (type) {
+ case SSH2_MSG_KEXGSS_CONTINUE:
+ debug("Received GSSAPI_CONTINUE");
+ if (maj_status == GSS_S_COMPLETE)
+ fatal("GSSAPI Continue received from server when complete");
+ recv_tok.value = packet_get_string(&strlen);
+ recv_tok.length = strlen;
+ break;
+ case SSH2_MSG_KEXGSS_COMPLETE:
+ debug("Received GSSAPI_COMPLETE");
+ packet_get_bignum2(dh_server_pub);
+ msg_tok.value = packet_get_string(&strlen);
+ msg_tok.length = strlen;
+
+ /* Is there a token included? */
+ if (packet_get_char()) {
+ recv_tok.value=
+ packet_get_string(&strlen);
+ recv_tok.length = strlen;
+ /* If we're already complete - protocol error */
+ if (maj_status == GSS_S_COMPLETE)
+ packet_disconnect("Protocol error: received token when complete");
+ } else {
+ /* No token included */
+ if (maj_status != GSS_S_COMPLETE)
+ packet_disconnect("Protocol error: did not receive final token");
+ }
+ break;
+ case SSH2_MSG_KEXGSS_ERROR:
+ debug("Received Error");
+ maj_status = packet_get_int();
+ min_status = packet_get_int();
+ msg = packet_get_string(NULL);
+ lang = packet_get_string(NULL);
+ fatal("GSSAPI Error: \n%.400s",msg);
+ default:
+ packet_disconnect("Protocol error: didn't expect packet type %d",
+ type);
+ }
+ token_ptr = &recv_tok;
+ } else {
+ /* No data, and not complete */
+ if (maj_status != GSS_S_COMPLETE)
+ fatal("Not complete, and no token output");
+ }
+ } while (maj_status & GSS_S_CONTINUE_NEEDED);
+
+ /*
+ * We _must_ have received a COMPLETE message in reply from the
+ * server, which will have set dh_server_pub and msg_tok
+ */
+
+ if (type != SSH2_MSG_KEXGSS_COMPLETE)
+ fatal("Didn't receive a SSH2_MSG_KEXGSS_COMPLETE when I expected it");
+
+ /* Check f in range [1, p-1] */
+ if (!dh_pub_is_valid(dh, dh_server_pub))
+ packet_disconnect("bad server public DH value");
+
+ /* compute K=f^x mod p */
+ klen = DH_size(dh);
+ kbuf = xmalloc(klen);
+ kout = DH_compute_key(kbuf, dh_server_pub, dh);
+ if (kout < 0)
+ fatal("DH_compute_key: failed");
+
+ shared_secret = BN_new();
+ if (shared_secret == NULL)
+ fatal("kexgss_client: BN_new failed");
+
+ if (BN_bin2bn(kbuf, kout, shared_secret) == NULL)
+ fatal("kexdh_client: BN_bin2bn failed");
+
+ memset(kbuf, 0, klen);
+ free(kbuf);
+
+ hashlen = sizeof(hash);
+ switch (ssh->kex->kex_type) {
+ case KEX_GSS_GRP1_SHA1:
+ case KEX_GSS_GRP14_SHA1:
+ kex_dh_hash(
+ ssh->kex->hash_alg,
+ ssh->kex->client_version_string,
+ ssh->kex->server_version_string,
+ sshbuf_ptr(ssh->kex->my), sshbuf_len(ssh->kex->my),
+ sshbuf_ptr(ssh->kex->peer), sshbuf_len(ssh->kex->peer),
+ (serverhostkey ? serverhostkey : empty), slen,
+ pub_key, /* e */
+ dh_server_pub, /* f */
+ shared_secret, /* K */
+ hash, &hashlen
+ );
+ break;
+ case KEX_GSS_GEX_SHA1:
+ DH_get0_pqg(dh, &p1, NULL, &g1);
+ kexgex_hash(
+ ssh->kex->hash_alg,
+ ssh->kex->client_version_string,
+ ssh->kex->server_version_string,
+ sshbuf_ptr(ssh->kex->my), sshbuf_len(ssh->kex->my),
+ sshbuf_ptr(ssh->kex->peer), sshbuf_len(ssh->kex->peer),
+ (serverhostkey ? serverhostkey : empty), slen,
+ min, nbits, max,
+ p, g,
+ pub_key,
+ dh_server_pub,
+ shared_secret,
+ hash, &hashlen
+ );
+ break;
+ default:
+ fatal("%s: Unexpected KEX type %d", __func__, ssh->kex->kex_type);
+ }
+
+ gssbuf.value = hash;
+ gssbuf.length = hashlen;
+
+ /* Verify that the hash matches the MIC we just got. */
+ if (GSS_ERROR(ssh_gssapi_checkmic(ctxt, &gssbuf, &msg_tok)))
+ packet_disconnect("Hash's MIC didn't verify");
+
+ free(msg_tok.value);
+
+ DH_free(dh);
+ if (serverhostkey)
+ free(serverhostkey);
+ BN_clear_free(dh_server_pub);
+
+ /* save session id */
+ if (ssh->kex->session_id == NULL) {
+ ssh->kex->session_id_len = hashlen;
+ ssh->kex->session_id = xmalloc(ssh->kex->session_id_len);
+ memcpy(ssh->kex->session_id, hash, ssh->kex->session_id_len);
+ }
+
+ if (ssh->kex->gss_deleg_creds)
+ ssh_gssapi_credentials_updated(ctxt);
+
+ if (gss_kex_context == NULL)
+ gss_kex_context = ctxt;
+ else
+ ssh_gssapi_delete_ctx(&ctxt);
+
+ kex_derive_keys_bn(ssh, hash, hashlen, shared_secret);
+ BN_clear_free(shared_secret);
+ return kex_send_newkeys(ssh);
+}
+
+#endif /* GSSAPI */
Index: openssh-7.9p1/kexgsss.c
===================================================================
--- /dev/null 1970-01-01 00:00:00.000000000 +0000
+++ openssh-7.9p1/kexgsss.c 2019-02-27 15:43:51.432516148 +0100
@@ -0,0 +1,302 @@
+/*
+ * Copyright (c) 2001-2009 Simon Wilkinson. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR `AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "includes.h"
+
+#ifdef GSSAPI
+
+#include <string.h>
+
+#include <openssl/crypto.h>
+#include <openssl/bn.h>
+
+#include "xmalloc.h"
+#include "sshbuf.h"
+#include "ssh2.h"
+#include "sshkey.h"
+#include "cipher.h"
+#include "kex.h"
+#include "log.h"
+#include "packet.h"
+#include "dh.h"
+#include "ssh-gss.h"
+#include "monitor_wrap.h"
+#include "misc.h" /* servconf.h needs misc.h for struct ForwardOptions */
+#include "servconf.h"
+#include "digest.h"
+
+#include "fips.h"
+
+extern ServerOptions options;
+
+int
+kexgss_server(struct ssh *ssh)
+{
+ OM_uint32 maj_status, min_status;
+
+ /*
+ * Some GSSAPI implementations use the input value of ret_flags (an
+ * output variable) as a means of triggering mechanism specific
+ * features. Initializing it to zero avoids inadvertently
+ * activating this non-standard behaviour.
+ */
+
+ OM_uint32 ret_flags = 0;
+ gss_buffer_desc gssbuf, recv_tok, msg_tok;
+ gss_buffer_desc send_tok = GSS_C_EMPTY_BUFFER;
+ Gssctxt *ctxt = NULL;
+ u_int slen, klen, kout;
+ u_char *kbuf;
+ DH *dh;
+ int min = -1, max = -1, nbits = -1;
+ int cmin = -1, cmax = -1; /* client proposal */
+ BIGNUM *shared_secret = NULL;
+ BIGNUM *dh_client_pub = NULL;
+ int type = 0;
+ gss_OID oid;
+ char *mechs;
+ u_char hash[SSH_DIGEST_MAX_LENGTH];
+ size_t hashlen;
+ const BIGNUM *p, *g, *pub_key;
+
+ /* Initialise GSSAPI */
+
+ /* If we're rekeying, privsep means that some of the private structures
+ * in the GSSAPI code are no longer available. This kludges them back
+ * into life
+ */
+ if (!ssh_gssapi_oid_table_ok())
+ if ((mechs = ssh_gssapi_server_mechanisms()))
+ free(mechs);
+
+ debug2("%s: Identifying %s", __func__, ssh->kex->name);
+ oid = ssh_gssapi_id_kex(NULL, ssh->kex->name, ssh->kex->kex_type);
+ if (oid == GSS_C_NO_OID)
+ fatal("Unknown gssapi mechanism");
+
+ debug2("%s: Acquiring credentials", __func__);
+
+ if (GSS_ERROR(PRIVSEP(ssh_gssapi_server_ctx(&ctxt, oid))))
+ fatal("Unable to acquire credentials for the server");
+
+ switch (ssh->kex->kex_type) {
+ case KEX_GSS_GRP1_SHA1:
+ dh = dh_new_group1();
+ break;
+ case KEX_GSS_GRP14_SHA1:
+ dh = dh_new_group14();
+ break;
+ case KEX_GSS_GEX_SHA1:
+ debug("Doing group exchange");
+ packet_read_expect(SSH2_MSG_KEXGSS_GROUPREQ);
+ /* store client proposal to provide valid signature */
+ cmin = packet_get_int();
+ nbits = packet_get_int();
+ cmax = packet_get_int();
+ min = MAX(DH_GRP_MIN, cmin);
+ max = MIN(DH_GRP_MAX, cmax);
+ packet_check_eom();
+ if (max < min || nbits < min || max < nbits) {
+ fatal("GSS_GEX, bad parameters: %d !< %d !< %d",
+ min, nbits, max);
+ }
+ dh = PRIVSEP(choose_dh(min, nbits, max));
+ if (dh == NULL)
+ packet_disconnect("Protocol error: no matching group found");
+
+ DH_set0_pqg(dh, &p, NULL, &g);
+ packet_start(SSH2_MSG_KEXGSS_GROUP);
+ packet_put_bignum2((BIGNUM *)p);
+ packet_put_bignum2((BIGNUM *)g);
+ packet_send();
+
+ packet_write_wait();
+ break;
+ default:
+ fatal("%s: Unexpected KEX type %d", __func__, ssh->kex->kex_type);
+ }
+
+ dh_gen_key(dh, ssh->kex->we_need * 8);
+
+ do {
+ debug("Wait SSH2_MSG_GSSAPI_INIT");
+ type = packet_read();
+ switch(type) {
+ case SSH2_MSG_KEXGSS_INIT:
+ if (dh_client_pub != NULL)
+ fatal("Received KEXGSS_INIT after initialising");
+ recv_tok.value = packet_get_string(&slen);
+ recv_tok.length = slen;
+
+ if ((dh_client_pub = BN_new()) == NULL)
+ fatal("dh_client_pub == NULL");
+
+ packet_get_bignum2(dh_client_pub);
+
+ /* Send SSH_MSG_KEXGSS_HOSTKEY here, if we want */
+ break;
+ case SSH2_MSG_KEXGSS_CONTINUE:
+ recv_tok.value = packet_get_string(&slen);
+ recv_tok.length = slen;
+ break;
+ default:
+ packet_disconnect(
+ "Protocol error: didn't expect packet type %d",
+ type);
+ }
+
+ maj_status = PRIVSEP(ssh_gssapi_accept_ctx(ctxt, &recv_tok,
+ &send_tok, &ret_flags));
+
+ free(recv_tok.value);
+
+ if (maj_status != GSS_S_COMPLETE && send_tok.length == 0)
+ fatal("Zero length token output when incomplete");
+
+ if (dh_client_pub == NULL)
+ fatal("No client public key");
+
+ if (maj_status & GSS_S_CONTINUE_NEEDED) {
+ debug("Sending GSSAPI_CONTINUE");
+ packet_start(SSH2_MSG_KEXGSS_CONTINUE);
+ packet_put_string(send_tok.value, send_tok.length);
+ packet_send();
+ gss_release_buffer(&min_status, &send_tok);
+ }
+ } while (maj_status & GSS_S_CONTINUE_NEEDED);
+
+ if (GSS_ERROR(maj_status)) {
+ if (send_tok.length > 0) {
+ packet_start(SSH2_MSG_KEXGSS_CONTINUE);
+ packet_put_string((char *)send_tok.value, send_tok.length);
+ packet_send();
+ }
+ fatal("accept_ctx died");
+ }
+
+ if (!(ret_flags & GSS_C_MUTUAL_FLAG))
+ fatal("Mutual Authentication flag wasn't set");
+
+ if (!(ret_flags & GSS_C_INTEG_FLAG))
+ fatal("Integrity flag wasn't set");
+
+ if (!dh_pub_is_valid(dh, dh_client_pub))
+ packet_disconnect("bad client public DH value");
+
+ klen = DH_size(dh);
+ kbuf = xmalloc(klen);
+ kout = DH_compute_key(kbuf, dh_client_pub, dh);
+ if ((int)kout < 0)
+ fatal("DH_compute_key: failed");
+
+ shared_secret = BN_new();
+ if (shared_secret == NULL)
+ fatal("kexgss_server: BN_new failed");
+
+ if (BN_bin2bn(kbuf, kout, shared_secret) == NULL)
+ fatal("kexgss_server: BN_bin2bn failed");
+
+ memset(kbuf, 0, klen);
+ free(kbuf);
+
+ DH_get0_key(dh, &pub_key, NULL);
+ hashlen = sizeof(hash);
+ switch (ssh->kex->kex_type) {
+ case KEX_GSS_GRP1_SHA1:
+ case KEX_GSS_GRP14_SHA1:
+ kex_dh_hash(ssh->kex->hash_alg,
+ ssh->kex->client_version_string, ssh->kex->server_version_string,
+ sshbuf_ptr(ssh->kex->peer), sshbuf_len(ssh->kex->peer),
+ sshbuf_ptr(ssh->kex->my), sshbuf_len(ssh->kex->my),
+ NULL, 0, /* Change this if we start sending host keys */
+ dh_client_pub, pub_key, shared_secret,
+ hash, &hashlen
+ );
+ break;
+ case KEX_GSS_GEX_SHA1:
+ kexgex_hash(
+ ssh->kex->hash_alg,
+ ssh->kex->client_version_string, ssh->kex->server_version_string,
+ sshbuf_ptr(ssh->kex->peer), sshbuf_len(ssh->kex->peer),
+ sshbuf_ptr(ssh->kex->my), sshbuf_len(ssh->kex->my),
+ NULL, 0,
+ cmin, nbits, cmax,
+ p, g,
+ dh_client_pub,
+ pub_key,
+ shared_secret,
+ hash, &hashlen
+ );
+ break;
+ default:
+ fatal("%s: Unexpected KEX type %d", __func__, ssh->kex->kex_type);
+ }
+
+ BN_clear_free(dh_client_pub);
+
+ if (ssh->kex->session_id == NULL) {
+ ssh->kex->session_id_len = hashlen;
+ ssh->kex->session_id = xmalloc(ssh->kex->session_id_len);
+ memcpy(ssh->kex->session_id, hash, ssh->kex->session_id_len);
+ }
+
+ gssbuf.value = hash;
+ gssbuf.length = hashlen;
+
+ if (GSS_ERROR(PRIVSEP(ssh_gssapi_sign(ctxt,&gssbuf,&msg_tok))))
+ fatal("Couldn't get MIC");
+
+ packet_start(SSH2_MSG_KEXGSS_COMPLETE);
+ packet_put_bignum2(pub_key);
+ packet_put_string(msg_tok.value,msg_tok.length);
+
+ if (send_tok.length != 0) {
+ packet_put_char(1); /* true */
+ packet_put_string((char *)send_tok.value, send_tok.length);
+ } else {
+ packet_put_char(0); /* false */
+ }
+ packet_send();
+
+ gss_release_buffer(&min_status, &send_tok);
+ gss_release_buffer(&min_status, &msg_tok);
+
+ if (gss_kex_context == NULL)
+ gss_kex_context = ctxt;
+ else
+ ssh_gssapi_delete_ctx(&ctxt);
+
+ DH_free(dh);
+
+ kex_derive_keys_bn(ssh, hash, hashlen, shared_secret);
+ BN_clear_free(shared_secret);
+ kex_send_newkeys(ssh);
+
+ /* If this was a rekey, then save out any delegated credentials we
+ * just exchanged. */
+ if (options.gss_store_rekey)
+ ssh_gssapi_rekey_creds();
+ return 0;
+}
+#endif /* GSSAPI */
Index: openssh-7.9p1/monitor.c
===================================================================
--- openssh-7.9p1.orig/monitor.c 2018-10-17 02:01:20.000000000 +0200
+++ openssh-7.9p1/monitor.c 2019-02-27 15:43:55.360539487 +0100
@@ -145,6 +145,8 @@ int mm_answer_gss_setup_ctx(int, struct
int mm_answer_gss_accept_ctx(int, struct sshbuf *);
int mm_answer_gss_userok(int, struct sshbuf *);
int mm_answer_gss_checkmic(int, struct sshbuf *);
+int mm_answer_gss_sign(int, struct sshbuf *);
+int mm_answer_gss_updatecreds(int, struct sshbuf *);
#endif
#ifdef SSH_AUDIT_EVENTS
@@ -215,6 +217,7 @@ struct mon_table mon_dispatch_proto20[]
{MONITOR_REQ_GSSSTEP, 0, mm_answer_gss_accept_ctx},
{MONITOR_REQ_GSSUSEROK, MON_ONCE|MON_AUTHDECIDE, mm_answer_gss_userok},
{MONITOR_REQ_GSSCHECKMIC, MON_ONCE, mm_answer_gss_checkmic},
+ {MONITOR_REQ_GSSSIGN, MON_ONCE, mm_answer_gss_sign},
#endif
{0, 0, NULL}
};
@@ -231,6 +234,12 @@ struct mon_table mon_dispatch_postauth20
{MONITOR_REQ_AUDIT_EVENT, MON_PERMIT, mm_answer_audit_event},
{MONITOR_REQ_AUDIT_COMMAND, MON_PERMIT, mm_answer_audit_command},
#endif
+#ifdef GSSAPI
+ {MONITOR_REQ_GSSSETUP, 0, mm_answer_gss_setup_ctx},
+ {MONITOR_REQ_GSSSTEP, 0, mm_answer_gss_accept_ctx},
+ {MONITOR_REQ_GSSSIGN, 0, mm_answer_gss_sign},
+ {MONITOR_REQ_GSSUPCREDS, 0, mm_answer_gss_updatecreds},
+#endif
{0, 0, NULL}
};
@@ -289,7 +298,10 @@ monitor_child_preauth(Authctxt *_authctx
/* Permit requests for moduli and signatures */
monitor_permit(mon_dispatch, MONITOR_REQ_MODULI, 1);
monitor_permit(mon_dispatch, MONITOR_REQ_SIGN, 1);
-
+#ifdef GSSAPI
+ /* and for the GSSAPI key exchange */
+ monitor_permit(mon_dispatch, MONITOR_REQ_GSSSETUP, 1);
+#endif
/* The first few requests do not require asynchronous access */
while (!authenticated) {
partial = 0;
@@ -401,6 +413,10 @@ monitor_child_postauth(struct monitor *p
monitor_permit(mon_dispatch, MONITOR_REQ_MODULI, 1);
monitor_permit(mon_dispatch, MONITOR_REQ_SIGN, 1);
monitor_permit(mon_dispatch, MONITOR_REQ_TERM, 1);
+#ifdef GSSAPI
+ /* and for the GSSAPI key exchange */
+ monitor_permit(mon_dispatch, MONITOR_REQ_GSSSETUP, 1);
+#endif
if (auth_opts->permit_pty_flag) {
monitor_permit(mon_dispatch, MONITOR_REQ_PTY, 1);
@@ -609,7 +625,7 @@ mm_answer_moduli(int sock, struct sshbuf
int
mm_answer_sign(int sock, struct sshbuf *m)
{
- struct ssh *ssh = active_state; /* XXX */
+ struct ssh *ssh = active_state; /* XXX */
extern int auth_sock; /* XXX move to state struct? */
struct sshkey *key;
struct sshbuf *sigbuf = NULL;
@@ -1647,7 +1663,7 @@ monitor_apply_keystate(struct monitor *p
debug3("%s: packet_set_state", __func__);
if ((r = ssh_packet_set_state(ssh, child_state)) != 0)
- fatal("%s: packet_set_state: %s", __func__, ssh_err(r));
+ fatal("%s: packet_set_state: %s", __func__, ssh_err(r));
sshbuf_free(child_state);
child_state = NULL;
@@ -1666,6 +1682,13 @@ monitor_apply_keystate(struct monitor *p
# endif
#endif /* WITH_OPENSSL */
kex->kex[KEX_C25519_SHA256] = kexc25519_server;
+#ifdef GSSAPI
+ if (options.gss_keyex) {
+ kex->kex[KEX_GSS_GRP1_SHA1] = kexgss_server;
+ kex->kex[KEX_GSS_GRP14_SHA1] = kexgss_server;
+ kex->kex[KEX_GSS_GEX_SHA1] = kexgss_server;
+ }
+#endif
kex->load_host_public_key=&get_hostkey_public_by_type;
kex->load_host_private_key=&get_hostkey_private_by_type;
kex->host_key_index=&get_hostkey_index;
@@ -1756,8 +1779,8 @@ mm_answer_gss_setup_ctx(int sock, struct
u_char *p;
int r;
- if (!options.gss_authentication)
- fatal("%s: GSSAPI authentication not enabled", __func__);
+ if (!options.gss_authentication && !options.gss_keyex)
+ fatal("%s: GSSAPI authentication not enabled", __func__);
if ((r = sshbuf_get_string(m, &p, &len)) != 0)
fatal("%s: buffer error: %s", __func__, ssh_err(r));
@@ -1789,7 +1812,7 @@ mm_answer_gss_accept_ctx(int sock, struc
OM_uint32 flags = 0; /* GSI needs this */
int r;
- if (!options.gss_authentication)
+ if (!options.gss_authentication && !options.gss_keyex)
fatal("%s: GSSAPI authentication not enabled", __func__);
if ((r = ssh_gssapi_get_buffer_desc(m, &in)) != 0)
@@ -1810,6 +1833,7 @@ mm_answer_gss_accept_ctx(int sock, struc
monitor_permit(mon_dispatch, MONITOR_REQ_GSSSTEP, 0);
monitor_permit(mon_dispatch, MONITOR_REQ_GSSUSEROK, 1);
monitor_permit(mon_dispatch, MONITOR_REQ_GSSCHECKMIC, 1);
+ monitor_permit(mon_dispatch, MONITOR_REQ_GSSSIGN, 1);
}
return (0);
}
@@ -1821,7 +1845,7 @@ mm_answer_gss_checkmic(int sock, struct
OM_uint32 ret;
int r;
- if (!options.gss_authentication)
+ if (!options.gss_authentication && !options.gss_keyex)
fatal("%s: GSSAPI authentication not enabled", __func__);
if ((r = ssh_gssapi_get_buffer_desc(m, &gssbuf)) != 0 ||
@@ -1851,10 +1875,11 @@ mm_answer_gss_userok(int sock, struct ss
int r, authenticated;
const char *displayname;
- if (!options.gss_authentication)
+ if (!options.gss_authentication && !options.gss_keyex)
fatal("%s: GSSAPI authentication not enabled", __func__);
- authenticated = authctxt->valid && ssh_gssapi_userok(authctxt->user);
+ authenticated = authctxt->valid &&
+ ssh_gssapi_userok(authctxt->user, authctxt->pw);
sshbuf_reset(m);
if ((r = sshbuf_put_u32(m, authenticated)) != 0)
@@ -1871,5 +1896,73 @@ mm_answer_gss_userok(int sock, struct ss
/* Monitor loop will terminate if authenticated */
return (authenticated);
}
-#endif /* GSSAPI */
+int
+mm_answer_gss_sign(int socket, struct sshbuf *m)
+{
+ gss_buffer_desc data;
+ gss_buffer_desc hash = GSS_C_EMPTY_BUFFER;
+ OM_uint32 major, minor;
+ int r;
+
+ if (!options.gss_authentication && !options.gss_keyex)
+ fatal("In GSSAPI monitor when GSSAPI is disabled");
+
+ if ((r = sshbuf_get_string(m, (u_char **)&data.value, &data.length)) != 0)
+ fatal("%s: buffer error: %s", __func__, ssh_err(r));
+ if (data.length != 20)
+ fatal("%s: data length incorrect: %d", __func__,
+ (int) data.length);
+
+ /* Save the session ID on the first time around */
+ if (session_id2_len == 0) {
+ session_id2_len = data.length;
+ session_id2 = xmalloc(session_id2_len);
+ memcpy(session_id2, data.value, session_id2_len);
+ }
+ major = ssh_gssapi_sign(gsscontext, &data, &hash);
+
+ free(data.value);
+
+ sshbuf_reset(m);
+ if ((r = sshbuf_put_u32(m, major)) != 0 ||
+ (r = sshbuf_put_string(m, hash.value, hash.length)) != 0)
+ fatal("%s: buffer error: %s", __func__, ssh_err(r));
+
+ mm_request_send(socket, MONITOR_ANS_GSSSIGN, m);
+
+ gss_release_buffer(&minor, &hash);
+
+ /* Turn on getpwnam permissions */
+ monitor_permit(mon_dispatch, MONITOR_REQ_PWNAM, 1);
+
+ /* And credential updating, for when rekeying */
+ monitor_permit(mon_dispatch, MONITOR_REQ_GSSUPCREDS, 1);
+
+ return (0);
+}
+
+int
+mm_answer_gss_updatecreds(int socket, struct sshbuf *m) {
+ ssh_gssapi_ccache store;
+ int ok, r;
+
+ if ((r = sshbuf_get_cstring(m, &store.envvar, NULL)) != 0 ||
+ (r = sshbuf_get_cstring(m, &store.envval, NULL)) != 0)
+ fatal("%s: buffer error: %s", __func__, ssh_err(r));
+
+ ok = ssh_gssapi_update_creds(&store);
+
+ free(store.envvar);
+ free(store.envval);
+
+ sshbuf_reset(m);
+ if ((r = sshbuf_put_u32(m, ok)) != 0)
+ fatal("%s: buffer error: %s", __func__, ssh_err(r));
+
+ mm_request_send(socket, MONITOR_ANS_GSSUPCREDS, m);
+
+ return(0);
+}
+
+#endif /* GSSAPI */
Index: openssh-7.9p1/monitor.h
===================================================================
--- openssh-7.9p1.orig/monitor.h 2018-10-17 02:01:20.000000000 +0200
+++ openssh-7.9p1/monitor.h 2019-02-27 15:43:55.360539487 +0100
@@ -63,6 +63,9 @@ enum monitor_reqtype {
MONITOR_REQ_PAM_FREE_CTX = 110, MONITOR_ANS_PAM_FREE_CTX = 111,
MONITOR_REQ_AUDIT_EVENT = 112, MONITOR_REQ_AUDIT_COMMAND = 113,
+ MONITOR_REQ_GSSSIGN = 201, MONITOR_ANS_GSSSIGN = 202,
+ MONITOR_REQ_GSSUPCREDS = 203, MONITOR_ANS_GSSUPCREDS = 204,
+
};
struct monitor {
Index: openssh-7.9p1/monitor_wrap.c
===================================================================
--- openssh-7.9p1.orig/monitor_wrap.c 2018-10-17 02:01:20.000000000 +0200
+++ openssh-7.9p1/monitor_wrap.c 2019-02-27 15:43:55.360539487 +0100
@@ -984,7 +984,7 @@ mm_ssh_gssapi_checkmic(Gssctxt *ctx, gss
}
int
-mm_ssh_gssapi_userok(char *user)
+mm_ssh_gssapi_userok(char *user, struct passwd *pw)
{
struct sshbuf *m;
int r, authenticated = 0;
@@ -1003,4 +1003,52 @@ mm_ssh_gssapi_userok(char *user)
debug3("%s: user %sauthenticated",__func__, authenticated ? "" : "not ");
return (authenticated);
}
+
+OM_uint32
+mm_ssh_gssapi_sign(Gssctxt *ctx, gss_buffer_desc *data, gss_buffer_desc *hash)
+{
+ struct sshbuf *m;
+ OM_uint32 major;
+ int r;
+
+ if ((m = sshbuf_new()) == NULL)
+ fatal("%s: sshbuf_new failed", __func__);
+ if ((r = sshbuf_put_string(m, data->value, data->length)) != 0)
+ fatal("%s: buffer error: %s", __func__, ssh_err(r));
+
+ mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_GSSSIGN, m);
+ mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_GSSSIGN, m);
+
+ if ((r = sshbuf_get_u32(m, &major)) != 0 ||
+ (r = sshbuf_get_string(m, (u_char **)&hash->value, &hash->length)) != 0)
+ fatal("%s: buffer error: %s", __func__, ssh_err(r));
+
+ sshbuf_free(m);
+
+ return(major);
+}
+
+int
+mm_ssh_gssapi_update_creds(ssh_gssapi_ccache *store)
+{
+ struct sshbuf *m;
+ int ok, r;
+
+ if ((m = sshbuf_new()) == NULL)
+ fatal("%s: sshbuf_new failed", __func__);
+
+ if ((r = sshbuf_put_cstring(m, store->envvar ? store->envvar : "")) != 0 ||
+ (r = sshbuf_put_cstring(m, store->envval ? store->envval : "")) != 0)
+ fatal("%s: buffer error: %s", __func__, ssh_err(r));
+
+ mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_GSSUPCREDS, m);
+ mm_request_receive_expect(pmonitor->m_recvfd, MONITOR_ANS_GSSUPCREDS, m);
+
+ if ((r = sshbuf_get_u32(m, &ok)) != 0)
+ fatal("%s: buffer error: %s", __func__, ssh_err(r));
+
+ sshbuf_free(m);
+
+ return (ok);
+}
#endif /* GSSAPI */
Index: openssh-7.9p1/monitor_wrap.h
===================================================================
--- openssh-7.9p1.orig/monitor_wrap.h 2018-10-17 02:01:20.000000000 +0200
+++ openssh-7.9p1/monitor_wrap.h 2019-02-27 15:43:55.360539487 +0100
@@ -60,8 +60,10 @@ int mm_sshkey_verify(const struct sshkey
OM_uint32 mm_ssh_gssapi_server_ctx(Gssctxt **, gss_OID);
OM_uint32 mm_ssh_gssapi_accept_ctx(Gssctxt *,
gss_buffer_desc *, gss_buffer_desc *, OM_uint32 *);
-int mm_ssh_gssapi_userok(char *user);
+int mm_ssh_gssapi_userok(char *user, struct passwd *);
OM_uint32 mm_ssh_gssapi_checkmic(Gssctxt *, gss_buffer_t, gss_buffer_t);
+OM_uint32 mm_ssh_gssapi_sign(Gssctxt *, gss_buffer_t, gss_buffer_t);
+int mm_ssh_gssapi_update_creds(ssh_gssapi_ccache *);
#endif
#ifdef USE_PAM
Index: openssh-7.9p1/readconf.c
===================================================================
--- openssh-7.9p1.orig/readconf.c 2019-02-27 15:43:51.296515340 +0100
+++ openssh-7.9p1/readconf.c 2019-02-27 15:43:51.432516148 +0100
@@ -163,6 +163,8 @@ typedef enum {
oClearAllForwardings, oNoHostAuthenticationForLocalhost,
oEnableSSHKeysign, oRekeyLimit, oVerifyHostKeyDNS, oConnectTimeout,
oAddressFamily, oGssAuthentication, oGssDelegateCreds,
+ oGssTrustDns, oGssKeyEx, oGssClientIdentity, oGssRenewalRekey,
+ oGssServerIdentity,
oServerAliveInterval, oServerAliveCountMax, oIdentitiesOnly,
oSendEnv, oSetEnv, oControlPath, oControlMaster, oControlPersist,
oHashKnownHosts,
@@ -203,10 +205,20 @@ static struct {
/* Sometimes-unsupported options */
#if defined(GSSAPI)
{ "gssapiauthentication", oGssAuthentication },
+ { "gssapikeyexchange", oGssKeyEx },
{ "gssapidelegatecredentials", oGssDelegateCreds },
+ { "gssapitrustdns", oGssTrustDns },
+ { "gssapiclientidentity", oGssClientIdentity },
+ { "gssapiserveridentity", oGssServerIdentity },
+ { "gssapirenewalforcesrekey", oGssRenewalRekey },
# else
{ "gssapiauthentication", oUnsupported },
+ { "gssapikeyexchange", oUnsupported },
{ "gssapidelegatecredentials", oUnsupported },
+ { "gssapitrustdns", oUnsupported },
+ { "gssapiclientidentity", oUnsupported },
+ { "gssapiserveridentity", oUnsupported },
+ { "gssapirenewalforcesrekey", oUnsupported },
#endif
#ifdef ENABLE_PKCS11
{ "smartcarddevice", oPKCS11Provider },
@@ -976,10 +988,30 @@ parse_time:
intptr = &options->gss_authentication;
goto parse_flag;
+ case oGssKeyEx:
+ intptr = &options->gss_keyex;
+ goto parse_flag;
+
case oGssDelegateCreds:
intptr = &options->gss_deleg_creds;
goto parse_flag;
+ case oGssTrustDns:
+ intptr = &options->gss_trust_dns;
+ goto parse_flag;
+
+ case oGssClientIdentity:
+ charptr = &options->gss_client_identity;
+ goto parse_string;
+
+ case oGssServerIdentity:
+ charptr = &options->gss_server_identity;
+ goto parse_string;
+
+ case oGssRenewalRekey:
+ intptr = &options->gss_renewal_rekey;
+ goto parse_flag;
+
case oBatchMode:
intptr = &options->batch_mode;
goto parse_flag;
@@ -1861,7 +1893,12 @@ initialize_options(Options * options)
options->pubkey_authentication = -1;
options->challenge_response_authentication = -1;
options->gss_authentication = -1;
+ options->gss_keyex = -1;
options->gss_deleg_creds = -1;
+ options->gss_trust_dns = -1;
+ options->gss_renewal_rekey = -1;
+ options->gss_client_identity = NULL;
+ options->gss_server_identity = NULL;
options->password_authentication = -1;
options->kbd_interactive_authentication = -1;
options->kbd_interactive_devices = NULL;
@@ -2007,8 +2044,14 @@ fill_default_options(Options * options)
options->challenge_response_authentication = 1;
if (options->gss_authentication == -1)
options->gss_authentication = 0;
+ if (options->gss_keyex == -1)
+ options->gss_keyex = 0;
if (options->gss_deleg_creds == -1)
options->gss_deleg_creds = 0;
+ if (options->gss_trust_dns == -1)
+ options->gss_trust_dns = 0;
+ if (options->gss_renewal_rekey == -1)
+ options->gss_renewal_rekey = 0;
if (options->password_authentication == -1)
options->password_authentication = 1;
if (options->kbd_interactive_authentication == -1)
Index: openssh-7.9p1/readconf.h
===================================================================
--- openssh-7.9p1.orig/readconf.h 2019-02-27 15:43:51.296515340 +0100
+++ openssh-7.9p1/readconf.h 2019-02-27 15:43:51.432516148 +0100
@@ -40,7 +40,12 @@ typedef struct {
int challenge_response_authentication;
/* Try S/Key or TIS, authentication. */
int gss_authentication; /* Try GSS authentication */
+ int gss_keyex; /* Try GSS key exchange */
int gss_deleg_creds; /* Delegate GSS credentials */
+ int gss_trust_dns; /* Trust DNS for GSS canonicalization */
+ int gss_renewal_rekey; /* Credential renewal forces rekey */
+ char *gss_client_identity; /* Principal to initiate GSSAPI with */
+ char *gss_server_identity; /* GSSAPI target principal */
int password_authentication; /* Try password
* authentication. */
int kbd_interactive_authentication; /* Try keyboard-interactive auth. */
Index: openssh-7.9p1/regress/cert-hostkey.sh
===================================================================
--- openssh-7.9p1.orig/regress/cert-hostkey.sh 2018-10-17 02:01:20.000000000 +0200
+++ openssh-7.9p1/regress/cert-hostkey.sh 2019-02-27 15:43:51.432516148 +0100
@@ -66,7 +66,7 @@ touch $OBJ/host_revoked_plain
touch $OBJ/host_revoked_cert
cat $OBJ/host_ca_key.pub $OBJ/host_ca_key2.pub > $OBJ/host_revoked_ca
-PLAIN_TYPES=`$SSH -Q key-plain | sed 's/^ssh-dss/ssh-dsa/g;s/^ssh-//'`
+PLAIN_TYPES=`$SSH -Q key-plain | grep -v null | sed 's/^ssh-dss/ssh-dsa/g;s/^ssh-//'`
if echo "$PLAIN_TYPES" | grep '^rsa$' >/dev/null 2>&1 ; then
PLAIN_TYPES="$PLAIN_TYPES rsa-sha2-256 rsa-sha2-512"
Index: openssh-7.9p1/regress/cert-userkey.sh
===================================================================
--- openssh-7.9p1.orig/regress/cert-userkey.sh 2018-10-17 02:01:20.000000000 +0200
+++ openssh-7.9p1/regress/cert-userkey.sh 2019-02-27 15:43:51.432516148 +0100
@@ -7,7 +7,7 @@ rm -f $OBJ/authorized_keys_$USER $OBJ/us
cp $OBJ/sshd_proxy $OBJ/sshd_proxy_bak
cp $OBJ/ssh_proxy $OBJ/ssh_proxy_bak
-PLAIN_TYPES=`$SSH -Q key-plain | sed 's/^ssh-dss/ssh-dsa/;s/^ssh-//'`
+PLAIN_TYPES=`$SSH -Q key-plain | grep -v null | sed 's/^ssh-dss/ssh-dsa/;s/^ssh-//'`
EXTRA_TYPES=""
if echo "$PLAIN_TYPES" | grep '^rsa$' >/dev/null 2>&1 ; then
Index: openssh-7.9p1/regress/kextype.sh
===================================================================
--- openssh-7.9p1.orig/regress/kextype.sh 2018-10-17 02:01:20.000000000 +0200
+++ openssh-7.9p1/regress/kextype.sh 2019-02-27 15:43:51.432516148 +0100
@@ -14,6 +14,9 @@ echo "KexAlgorithms=$KEXOPT" >> $OBJ/ssh
tries="1 2 3 4"
for k in `${SSH} -Q kex`; do
+ if [ $k = "gss-gex-sha1-" -o $k = "gss-group1-sha1-" -o $k = "gss-group14-sha1-" ]; then
+ continue
+ fi
verbose "kex $k"
for i in $tries; do
${SSH} -F $OBJ/ssh_proxy -o KexAlgorithms=$k x true
Index: openssh-7.9p1/regress/rekey.sh
===================================================================
--- openssh-7.9p1.orig/regress/rekey.sh 2018-10-17 02:01:20.000000000 +0200
+++ openssh-7.9p1/regress/rekey.sh 2019-02-27 15:43:51.436516173 +0100
@@ -38,6 +38,9 @@ increase_datafile_size 300
opts=""
for i in `${SSH} -Q kex`; do
+ if [ $i = "gss-gex-sha1-" -o $i = "gss-group1-sha1-" -o $i = "gss-group14-sha1-" ]; then
+ continue
+ fi
opts="$opts KexAlgorithms=$i"
done
for i in `${SSH} -Q cipher`; do
@@ -56,6 +59,9 @@ done
if ${SSH} -Q cipher-auth | grep '^.*$' >/dev/null 2>&1 ; then
for c in `${SSH} -Q cipher-auth`; do
for kex in `${SSH} -Q kex`; do
+ if [ $kex = "gss-gex-sha1-" -o $kex = "gss-group1-sha1-" -o $kex = "gss-group14-sha1-" ]; then
+ continue
+ fi
verbose "client rekey $c $kex"
ssh_data_rekeying "KexAlgorithms=$kex" -oRekeyLimit=256k -oCiphers=$c
done
Index: openssh-7.9p1/servconf.c
===================================================================
--- openssh-7.9p1.orig/servconf.c 2019-02-27 15:43:51.296515340 +0100
+++ openssh-7.9p1/servconf.c 2019-02-27 15:43:51.436516173 +0100
@@ -126,8 +126,10 @@ initialize_server_options(ServerOptions
options->kerberos_ticket_cleanup = -1;
options->kerberos_get_afs_token = -1;
options->gss_authentication=-1;
+ options->gss_keyex = -1;
options->gss_cleanup_creds = -1;
options->gss_strict_acceptor = -1;
+ options->gss_store_rekey = -1;
options->password_authentication = -1;
options->kbd_interactive_authentication = -1;
options->challenge_response_authentication = -1;
@@ -360,10 +362,14 @@ fill_default_server_options(ServerOption
options->kerberos_get_afs_token = 0;
if (options->gss_authentication == -1)
options->gss_authentication = 0;
+ if (options->gss_keyex == -1)
+ options->gss_keyex = 0;
if (options->gss_cleanup_creds == -1)
options->gss_cleanup_creds = 1;
if (options->gss_strict_acceptor == -1)
options->gss_strict_acceptor = 1;
+ if (options->gss_store_rekey == -1)
+ options->gss_store_rekey = 0;
if (options->password_authentication == -1)
options->password_authentication = 1;
if (options->kbd_interactive_authentication == -1)
@@ -510,6 +516,7 @@ typedef enum {
sHostKeyAlgorithms,
sClientAliveInterval, sClientAliveCountMax, sAuthorizedKeysFile,
sGssAuthentication, sGssCleanupCreds, sGssStrictAcceptor,
+ sGssKeyEx, sGssStoreRekey,
sAcceptEnv, sSetEnv, sPermitTunnel,
sMatch, sPermitOpen, sPermitListen, sForceCommand, sChrootDirectory,
sUsePrivilegeSeparation, sAllowAgentForwarding,
@@ -587,11 +594,17 @@ static struct {
{ "gssapiauthentication", sGssAuthentication, SSHCFG_ALL },
{ "gssapicleanupcredentials", sGssCleanupCreds, SSHCFG_GLOBAL },
{ "gssapistrictacceptorcheck", sGssStrictAcceptor, SSHCFG_GLOBAL },
+ { "gssapikeyexchange", sGssKeyEx, SSHCFG_GLOBAL },
+ { "gssapistorecredentialsonrekey", sGssStoreRekey, SSHCFG_GLOBAL },
#else
{ "gssapiauthentication", sUnsupported, SSHCFG_ALL },
{ "gssapicleanupcredentials", sUnsupported, SSHCFG_GLOBAL },
{ "gssapistrictacceptorcheck", sUnsupported, SSHCFG_GLOBAL },
+ { "gssapikeyexchange", sUnsupported, SSHCFG_GLOBAL },
+ { "gssapistorecredentialsonrekey", sUnsupported, SSHCFG_GLOBAL },
#endif
+ { "gssusesessionccache", sUnsupported, SSHCFG_GLOBAL },
+ { "gssapiusesessioncredcache", sUnsupported, SSHCFG_GLOBAL },
{ "passwordauthentication", sPasswordAuthentication, SSHCFG_ALL },
{ "kbdinteractiveauthentication", sKbdInteractiveAuthentication, SSHCFG_ALL },
{ "challengeresponseauthentication", sChallengeResponseAuthentication, SSHCFG_GLOBAL },
@@ -1498,6 +1511,10 @@ process_server_config_line(ServerOptions
intptr = &options->gss_authentication;
goto parse_flag;
+ case sGssKeyEx:
+ intptr = &options->gss_keyex;
+ goto parse_flag;
+
case sGssCleanupCreds:
intptr = &options->gss_cleanup_creds;
goto parse_flag;
@@ -1506,6 +1523,10 @@ process_server_config_line(ServerOptions
intptr = &options->gss_strict_acceptor;
goto parse_flag;
+ case sGssStoreRekey:
+ intptr = &options->gss_store_rekey;
+ goto parse_flag;
+
case sPasswordAuthentication:
intptr = &options->password_authentication;
goto parse_flag;
@@ -2295,6 +2316,10 @@ copy_set_server_options(ServerOptions *d
M_CP_INTOPT(password_authentication);
M_CP_INTOPT(gss_authentication);
+ M_CP_INTOPT(gss_keyex);
+ M_CP_INTOPT(gss_cleanup_creds);
+ M_CP_INTOPT(gss_strict_acceptor);
+ M_CP_INTOPT(gss_store_rekey);
M_CP_INTOPT(pubkey_authentication);
M_CP_INTOPT(kerberos_authentication);
M_CP_INTOPT(hostbased_authentication);
@@ -2590,7 +2615,10 @@ dump_config(ServerOptions *o)
#endif
#ifdef GSSAPI
dump_cfg_fmtint(sGssAuthentication, o->gss_authentication);
+ dump_cfg_fmtint(sGssKeyEx, o->gss_keyex);
dump_cfg_fmtint(sGssCleanupCreds, o->gss_cleanup_creds);
+ dump_cfg_fmtint(sGssStrictAcceptor, o->gss_strict_acceptor);
+ dump_cfg_fmtint(sGssStoreRekey, o->gss_store_rekey);
#endif
dump_cfg_fmtint(sPasswordAuthentication, o->password_authentication);
dump_cfg_fmtint(sKbdInteractiveAuthentication,
Index: openssh-7.9p1/servconf.h
===================================================================
--- openssh-7.9p1.orig/servconf.h 2019-02-27 15:43:51.232514961 +0100
+++ openssh-7.9p1/servconf.h 2019-02-27 15:43:51.436516173 +0100
@@ -16,6 +16,8 @@
#ifndef SERVCONF_H
#define SERVCONF_H
+#include "misc.h"
+
#define MAX_PORTS 256 /* Max # ports. */
#define MAX_SUBSYSTEMS 256 /* Max # subsystems. */
@@ -125,8 +127,10 @@ typedef struct {
int kerberos_get_afs_token; /* If true, try to get AFS token if
* authenticated with Kerberos. */
int gss_authentication; /* If true, permit GSSAPI authentication */
+ int gss_keyex; /* If true, permit GSSAPI key exchange */
int gss_cleanup_creds; /* If true, destroy cred cache on logout */
int gss_strict_acceptor; /* If true, restrict the GSSAPI acceptor name */
+ int gss_store_rekey;
int password_authentication; /* If true, permit password
* authentication. */
int kbd_interactive_authentication; /* If true, permit */
Index: openssh-7.9p1/ssh-gss.h
===================================================================
--- openssh-7.9p1.orig/ssh-gss.h 2018-10-17 02:01:20.000000000 +0200
+++ openssh-7.9p1/ssh-gss.h 2019-02-27 15:43:51.436516173 +0100
@@ -61,10 +61,22 @@
#define SSH_GSS_OIDTYPE 0x06
+#define SSH2_MSG_KEXGSS_INIT 30
+#define SSH2_MSG_KEXGSS_CONTINUE 31
+#define SSH2_MSG_KEXGSS_COMPLETE 32
+#define SSH2_MSG_KEXGSS_HOSTKEY 33
+#define SSH2_MSG_KEXGSS_ERROR 34
+#define SSH2_MSG_KEXGSS_GROUPREQ 40
+#define SSH2_MSG_KEXGSS_GROUP 41
+#define KEX_GSS_GRP1_SHA1_ID "gss-group1-sha1-"
+#define KEX_GSS_GRP14_SHA1_ID "gss-group14-sha1-"
+#define KEX_GSS_GEX_SHA1_ID "gss-gex-sha1-"
+
typedef struct {
char *filename;
char *envvar;
char *envval;
+ struct passwd *owner;
void *data;
} ssh_gssapi_ccache;
@@ -72,8 +84,11 @@ typedef struct {
gss_buffer_desc displayname;
gss_buffer_desc exportedname;
gss_cred_id_t creds;
+ gss_name_t name;
struct ssh_gssapi_mech_struct *mech;
ssh_gssapi_ccache store;
+ int used;
+ int updated;
} ssh_gssapi_client;
typedef struct ssh_gssapi_mech_struct {
@@ -84,6 +99,7 @@ typedef struct ssh_gssapi_mech_struct {
int (*userok) (ssh_gssapi_client *, char *);
int (*localname) (ssh_gssapi_client *, char **);
void (*storecreds) (ssh_gssapi_client *);
+ int (*updatecreds) (ssh_gssapi_ccache *, ssh_gssapi_client *);
} ssh_gssapi_mech;
typedef struct {
@@ -94,10 +110,11 @@ typedef struct {
gss_OID oid; /* client */
gss_cred_id_t creds; /* server */
gss_name_t client; /* server */
- gss_cred_id_t client_creds; /* server */
+ gss_cred_id_t client_creds; /* both */
} Gssctxt;
extern ssh_gssapi_mech *supported_mechs[];
+extern Gssctxt *gss_kex_context;
int ssh_gssapi_check_oid(Gssctxt *, void *, size_t);
void ssh_gssapi_set_oid_data(Gssctxt *, void *, size_t);
@@ -123,17 +140,31 @@ void ssh_gssapi_delete_ctx(Gssctxt **);
OM_uint32 ssh_gssapi_sign(Gssctxt *, gss_buffer_t, gss_buffer_t);
void ssh_gssapi_buildmic(struct sshbuf *, const char *,
const char *, const char *);
-int ssh_gssapi_check_mechanism(Gssctxt **, gss_OID, const char *);
+int ssh_gssapi_check_mechanism(Gssctxt **, gss_OID, const char *, const char *);
+OM_uint32 ssh_gssapi_client_identity(Gssctxt *, const char *);
+int ssh_gssapi_credentials_updated(Gssctxt *);
/* In the server */
+typedef int ssh_gssapi_check_fn(Gssctxt **, gss_OID, const char *, const char *);
+char *ssh_gssapi_client_mechanisms(const char *, const char *, const char *);
+char *ssh_gssapi_kex_mechs(gss_OID_set, ssh_gssapi_check_fn *, const char *,
+ const char *);
+gss_OID ssh_gssapi_id_kex(Gssctxt *, char *, int);
+int ssh_gssapi_server_check_mech(Gssctxt **, gss_OID, const char *, const char *);
OM_uint32 ssh_gssapi_server_ctx(Gssctxt **, gss_OID);
-int ssh_gssapi_userok(char *name);
+int ssh_gssapi_userok(char *name, struct passwd *);
OM_uint32 ssh_gssapi_checkmic(Gssctxt *, gss_buffer_t, gss_buffer_t);
void ssh_gssapi_do_child(char ***, u_int *);
void ssh_gssapi_cleanup_creds(void);
void ssh_gssapi_storecreds(void);
const char *ssh_gssapi_displayname(void);
+char *ssh_gssapi_server_mechanisms(void);
+int ssh_gssapi_oid_table_ok();
+
+int ssh_gssapi_update_creds(ssh_gssapi_ccache *store);
+
+void ssh_gssapi_rekey_creds(void);
#endif /* GSSAPI */
#endif /* _SSH_GSS_H */
Index: openssh-7.9p1/ssh_config
===================================================================
--- openssh-7.9p1.orig/ssh_config 2019-02-27 15:43:51.172514604 +0100
+++ openssh-7.9p1/ssh_config 2019-02-27 15:43:51.436516173 +0100
@@ -40,6 +40,8 @@ Host *
# HostbasedAuthentication no
# GSSAPIAuthentication no
# GSSAPIDelegateCredentials no
+# GSSAPIKeyExchange no
+# GSSAPITrustDNS no
# BatchMode no
# CheckHostIP yes
# AddressFamily any
Index: openssh-7.9p1/ssh_config.0
===================================================================
--- openssh-7.9p1.orig/ssh_config.0 2019-02-27 15:43:51.300515365 +0100
+++ openssh-7.9p1/ssh_config.0 2019-02-27 15:43:51.436516173 +0100
@@ -422,9 +422,40 @@ DESCRIPTION
Specifies whether user authentication based on GSSAPI is allowed.
The default is no.
+ GSSAPIKeyExchange
+ Specifies whether key exchange based on GSSAPI may be used. When
+ using GSSAPI key exchange the server need not have a host key.
+ The default is no.
+ Note that this option applies to protocol version 2 only.
+
+ GSSAPIClientIdentity
+ If set, specifies the GSSAPI client identity that ssh should use
+ when connecting to the server. The default is unset, which means
+ that the default identity will be used.
+
+ GSSAPIServerIdentity
+ If set, specifies the GSSAPI server identity that ssh should expect
+ when connecting to the server. The default is unset, which means
+ that the expected GSSAPI server identity will be determined from
+ the target hostname.
+
GSSAPIDelegateCredentials
Forward (delegate) credentials to the server. The default is no.
+ GSSAPIRenewalForcesRekey
+ If set to yes then renewal of the client's GSSAPI credentials will
+ force the rekeying of the ssh connection. With a compatible server,
+ this can delegate the renewed credentials to a session on the
+ server. The default is no.
+
+ GSSAPITrustDns
+ Set to yes to indicate that the DNS is trusted to securely
+ canonicalize the name of the host being connected to. If no, the
+ hostname entered on the command line will be passed untouched to
+ the GSSAPI library. The default is no.
+ This option only applies to protocol version 2 connections using
+ GSSAPI.
+
HashKnownHosts
Indicates that ssh(1) should hash host names and addresses when
they are added to ~/.ssh/known_hosts. These hashed names may be
Index: openssh-7.9p1/ssh_config.5
===================================================================
--- openssh-7.9p1.orig/ssh_config.5 2019-02-27 15:43:51.300515365 +0100
+++ openssh-7.9p1/ssh_config.5 2019-02-27 15:43:51.436516173 +0100
@@ -738,10 +738,40 @@ The default is
Specifies whether user authentication based on GSSAPI is allowed.
The default is
.Cm no .
+.It Cm GSSAPIClientIdentity
+If set, specifies the GSSAPI client identity that ssh should use when
+connecting to the server. The default is unset, which means that the default
+identity will be used.
.It Cm GSSAPIDelegateCredentials
Forward (delegate) credentials to the server.
The default is
.Cm no .
+.It Cm GSSAPIKeyExchange
+Specifies whether key exchange based on GSSAPI may be used. When using
+GSSAPI key exchange the server need not have a host key.
+The default is
+.Dq no .
+.It Cm GSSAPIRenewalForcesRekey
+If set to
+.Dq yes
+then renewal of the client's GSSAPI credentials will force the rekeying of the
+ssh connection. With a compatible server, this can delegate the renewed
+credentials to a session on the server.
+The default is
+.Dq no .
+.It Cm GSSAPIServerIdentity
+If set, specifies the GSSAPI server identity that ssh should expect when
+connecting to the server. The default is unset, which means that the
+expected GSSAPI server identity will be determined from the target
+hostname.
+.It Cm GSSAPITrustDns
+Set to
+.Dq yes to indicate that the DNS is trusted to securely canonicalize
+the name of the host being connected to. If
+.Dq no, the hostname entered on the
+command line will be passed untouched to the GSSAPI library.
+The default is
+.Dq no .
.It Cm HashKnownHosts
Indicates that
.Xr ssh 1
Index: openssh-7.9p1/sshconnect2.c
===================================================================
--- openssh-7.9p1.orig/sshconnect2.c 2018-10-17 02:01:20.000000000 +0200
+++ openssh-7.9p1/sshconnect2.c 2019-02-27 15:43:51.436516173 +0100
@@ -82,6 +82,124 @@ extern char *client_version_string;
extern char *server_version_string;
extern Options options;
+/* XXX from auth.h -- refactoring move these useful functions away of client context*/
+
+/*
+ * Returns the remote DNS hostname as a string. The returned string must not
+ * be freed. NB. this will usually trigger a DNS query the first time it is
+ * called.
+ * This function does additional checks on the hostname to mitigate some
+ * attacks on legacy rhosts-style authentication.
+ * XXX is RhostsRSAAuthentication vulnerable to these?
+ * XXX Can we remove these checks? (or if not, remove RhostsRSAAuthentication?)
+ */
+
+static char *
+remote_hostname(struct ssh *ssh)
+{
+ struct sockaddr_storage from;
+ socklen_t fromlen;
+ struct addrinfo hints, *ai, *aitop;
+ char name[NI_MAXHOST], ntop2[NI_MAXHOST];
+ const char *ntop = ssh_remote_ipaddr(ssh);
+
+ /* Get IP address of client. */
+ fromlen = sizeof(from);
+ memset(&from, 0, sizeof(from));
+ if (getpeername(ssh_packet_get_connection_in(ssh),
+ (struct sockaddr *)&from, &fromlen) < 0) {
+ debug("getpeername failed: %.100s", strerror(errno));
+ return strdup(ntop);
+ }
+
+ ipv64_normalise_mapped(&from, &fromlen);
+ if (from.ss_family == AF_INET6)
+ fromlen = sizeof(struct sockaddr_in6);
+
+ debug3("Trying to reverse map address %.100s.", ntop);
+ /* Map the IP address to a host name. */
+ if (getnameinfo((struct sockaddr *)&from, fromlen, name, sizeof(name),
+ NULL, 0, NI_NAMEREQD) != 0) {
+ /* Host name not found. Use ip address. */
+ return strdup(ntop);
+ }
+
+ /*
+ * if reverse lookup result looks like a numeric hostname,
+ * someone is trying to trick us by PTR record like following:
+ * 1.1.1.10.in-addr.arpa. IN PTR 2.3.4.5
+ */
+ memset(&hints, 0, sizeof(hints));
+ hints.ai_socktype = SOCK_DGRAM; /*dummy*/
+ hints.ai_flags = AI_NUMERICHOST;
+ if (getaddrinfo(name, NULL, &hints, &ai) == 0) {
+ logit("Nasty PTR record \"%s\" is set up for %s, ignoring",
+ name, ntop);
+ freeaddrinfo(ai);
+ return strdup(ntop);
+ }
+
+ /* Names are stored in lowercase. */
+ lowercase(name);
+
+ /*
+ * Map it back to an IP address and check that the given
+ * address actually is an address of this host. This is
+ * necessary because anyone with access to a name server can
+ * define arbitrary names for an IP address. Mapping from
+ * name to IP address can be trusted better (but can still be
+ * fooled if the intruder has access to the name server of
+ * the domain).
+ */
+ memset(&hints, 0, sizeof(hints));
+ hints.ai_family = from.ss_family;
+ hints.ai_socktype = SOCK_STREAM;
+ if (getaddrinfo(name, NULL, &hints, &aitop) != 0) {
+ logit("reverse mapping checking getaddrinfo for %.700s "
+ "[%s] failed.", name, ntop);
+ return strdup(ntop);
+ }
+ /* Look for the address from the list of addresses. */
+ for (ai = aitop; ai; ai = ai->ai_next) {
+ if (getnameinfo(ai->ai_addr, ai->ai_addrlen, ntop2,
+ sizeof(ntop2), NULL, 0, NI_NUMERICHOST) == 0 &&
+ (strcmp(ntop, ntop2) == 0))
+ break;
+ }
+ freeaddrinfo(aitop);
+ /* If we reached the end of the list, the address was not there. */
+ if (ai == NULL) {
+ /* Address not found for the host name. */
+ logit("Address %.100s maps to %.600s, but this does not "
+ "map back to the address.", ntop, name);
+ return strdup(ntop);
+ }
+ return strdup(name);
+}
+
+/*
+ * Return the canonical name of the host in the other side of the current
+ * connection. The host name is cached, so it is efficient to call this
+ * several times.
+ */
+
+const char *
+get_canonical_hostname(struct ssh *ssh, int use_dns)
+{
+ static char *dnsname;
+
+ if (!use_dns)
+ return ssh_remote_ipaddr(ssh);
+ else if (dnsname != NULL)
+ return dnsname;
+ else {
+ dnsname = remote_hostname(ssh);
+ return dnsname;
+ }
+}
+
+
+
/*
* SSH2 key exchange
*/
@@ -162,9 +280,37 @@ ssh_kex2(char *host, struct sockaddr *ho
struct kex *kex;
int r;
+#ifdef GSSAPI
+ char *orig = NULL, *gss = NULL;
+ char *gss_host = NULL;
+#endif
+
xxx_host = host;
xxx_hostaddr = hostaddr;
+#ifdef GSSAPI
+ /* TODO: should we use myproposal[PROPOSAL_KEX_ALGS]
+ * instead of options.kex_algorithms? */
+ if (options.gss_keyex) {
+ /* Add the GSSAPI mechanisms currently supported on this
+ * client to the key exchange algorithm proposal */
+ orig = options.kex_algorithms;
+
+ if (options.gss_trust_dns)
+ gss_host = (char *)get_canonical_hostname(active_state, 1);
+ else
+ gss_host = host;
+
+ gss = ssh_gssapi_client_mechanisms(gss_host, options.gss_client_identity,
+ options.kex_algorithms);
+ if (gss) {
+ debug("Offering GSSAPI proposal: %s", gss);
+ xasprintf(&options.kex_algorithms,
+ "%s,%s", gss, orig);
+ }
+ }
+#endif
+
if ((s = kex_names_cat(options.kex_algorithms, "ext-info-c")) == NULL)
fatal("%s: kex_names_cat", __func__);
myproposal[PROPOSAL_KEX_ALGS] = compat_kex_proposal(s);
@@ -194,6 +340,17 @@ ssh_kex2(char *host, struct sockaddr *ho
order_hostkeyalgs(host, hostaddr, port));
}
+#ifdef GSSAPI
+ /* If we've got GSSAPI algorithms, then we also support the
+ * 'null' hostkey, as a last resort */
+ if (options.gss_keyex && gss) {
+ orig = myproposal[PROPOSAL_SERVER_HOST_KEY_ALGS];
+ xasprintf(&myproposal[PROPOSAL_SERVER_HOST_KEY_ALGS],
+ "%s,null", orig);
+ free(gss);
+ }
+#endif
+
if (options.rekey_limit || options.rekey_interval)
packet_set_rekey_limits(options.rekey_limit,
options.rekey_interval);
@@ -215,10 +372,30 @@ ssh_kex2(char *host, struct sockaddr *ho
# endif
#endif
kex->kex[KEX_C25519_SHA256] = kexc25519_client;
+#ifdef GSSAPI
+ if (options.gss_keyex) {
+ kex->kex[KEX_GSS_GRP1_SHA1] = kexgss_client;
+ kex->kex[KEX_GSS_GRP14_SHA1] = kexgss_client;
+ kex->kex[KEX_GSS_GEX_SHA1] = kexgss_client;
+ }
+#endif
kex->client_version_string=client_version_string;
kex->server_version_string=server_version_string;
kex->verify_host_key=&verify_host_key_callback;
+#ifdef GSSAPI
+ if (options.gss_keyex) {
+ kex->gss_deleg_creds = options.gss_deleg_creds;
+ kex->gss_trust_dns = options.gss_trust_dns;
+ kex->gss_client = options.gss_client_identity;
+ if (options.gss_server_identity) {
+ kex->gss_host = options.gss_server_identity;
+ } else {
+ kex->gss_host = gss_host;
+ }
+ }
+#endif
+
ssh_dispatch_run_fatal(active_state, DISPATCH_BLOCK, &kex->done);
/* remove ext-info from the KEX proposals for rekeying */
@@ -314,6 +491,7 @@ int input_gssapi_token(int type, u_int32
int input_gssapi_hash(int type, u_int32_t, struct ssh *);
int input_gssapi_error(int, u_int32_t, struct ssh *);
int input_gssapi_errtok(int, u_int32_t, struct ssh *);
+int userauth_gsskeyex(Authctxt *authctxt);
#endif
void userauth(Authctxt *, char *);
@@ -330,6 +508,11 @@ static char *authmethods_get(void);
Authmethod authmethods[] = {
#ifdef GSSAPI
+ {"gssapi-keyex",
+ userauth_gsskeyex,
+ NULL,
+ &options.gss_authentication,
+ NULL},
{"gssapi-with-mic",
userauth_gssapi,
NULL,
@@ -686,19 +869,31 @@ userauth_gssapi(Authctxt *authctxt)
static u_int mech = 0;
OM_uint32 min;
int r, ok = 0;
+ const char *gss_host;
+
+if (options.gss_server_identity)
+ gss_host = options.gss_server_identity;
+ else if (options.gss_trust_dns)
+ gss_host = get_canonical_hostname(active_state, 1);
+ else
+ gss_host = authctxt->host;
/* Try one GSSAPI method at a time, rather than sending them all at
* once. */
if (gss_supported == NULL)
- gss_indicate_mechs(&min, &gss_supported);
+ if (GSS_ERROR(gss_indicate_mechs(&min, &gss_supported))) {
+ gss_supported = NULL;
+ return 0;
+ }
/* Check to see if the mechanism is usable before we offer it */
while (mech < gss_supported->count && !ok) {
/* My DER encoding requires length<128 */
if (gss_supported->elements[mech].length < 128 &&
ssh_gssapi_check_mechanism(&gssctxt,
- &gss_supported->elements[mech], authctxt->host)) {
+ &gss_supported->elements[mech], gss_host,
+ options.gss_client_identity)) {
ok = 1; /* Mechanism works */
} else {
mech++;
@@ -935,6 +1130,51 @@ input_gssapi_error(int type, u_int32_t p
free(lang);
return r;
}
+
+int
+userauth_gsskeyex(Authctxt *authctxt)
+{
+ struct sshbuf *b = NULL;
+ gss_buffer_desc gssbuf;
+ gss_buffer_desc mic = GSS_C_EMPTY_BUFFER;
+ OM_uint32 ms;
+
+ static int attempt = 0;
+ if (attempt++ >= 1)
+ return (0);
+
+ if (gss_kex_context == NULL) {
+ debug("No valid Key exchange context");
+ return (0);
+ }
+
+ if ((b = sshbuf_new()) == NULL)
+ fatal("%s: sshbuf_new failed", __func__);
+
+ ssh_gssapi_buildmic(b, authctxt->server_user, authctxt->service,
+ "gssapi-keyex");
+
+ gssbuf.value = sshbuf_mutable_ptr(b);
+ gssbuf.length = sshbuf_len(b);
+
+ if (GSS_ERROR(ssh_gssapi_sign(gss_kex_context, &gssbuf, &mic))) {
+ sshbuf_free(b);
+ return (0);
+ }
+
+ packet_start(SSH2_MSG_USERAUTH_REQUEST);
+ packet_put_cstring(authctxt->server_user);
+ packet_put_cstring(authctxt->service);
+ packet_put_cstring(authctxt->method->name);
+ packet_put_string(mic.value, mic.length);
+ packet_send();
+
+ sshbuf_free(b);
+ gss_release_buffer(&ms, &mic);
+
+ return (1);
+}
+
#endif /* GSSAPI */
int
@@ -1473,8 +1713,8 @@ key_type_allowed_by_config(struct sshkey
/*
* try keys in the following order:
- * 1. certificates listed in the config file
- * 2. other input certificates
+ * 1. certificates listed in the config file
+ * 2. other input certificates
* 3. agent keys that are found in the config file
* 4. other agent keys
* 5. keys that are only listed in the config file
Index: openssh-7.9p1/sshd.c
===================================================================
--- openssh-7.9p1.orig/sshd.c 2019-02-27 15:43:51.412516029 +0100
+++ openssh-7.9p1/sshd.c 2019-02-27 15:43:55.360539487 +0100
@@ -131,6 +131,10 @@
#include "fips.h"
+#ifdef USE_SECURITY_SESSION_API
+#include <Security/AuthSession.h>
+#endif
+
/* Re-exec fds */
#define REEXEC_DEVCRYPTO_RESERVED_FD (STDERR_FILENO + 1)
#define REEXEC_STARTUP_PIPE_FD (STDERR_FILENO + 2)
@@ -555,7 +559,8 @@ privsep_preauth_child(void)
#ifdef GSSAPI
/* Cache supported mechanism OIDs for later use */
- ssh_gssapi_prepare_supported_oids();
+ if (options.gss_authentication || options.gss_keyex)
+ ssh_gssapi_prepare_supported_oids();
#endif
reseed_prngs();
@@ -897,8 +902,9 @@ notify_hostkeys(struct ssh *ssh)
}
debug3("%s: sent %u hostkeys", __func__, nkeys);
if (nkeys == 0)
- fatal("%s: no hostkeys", __func__);
- packet_send();
+ debug3("%s: no hostkeys", __func__);
+ else
+ packet_send();
sshbuf_free(buf);
}
@@ -1837,7 +1843,12 @@ main(int ac, char **av)
free(fp);
}
accumulate_host_timing_secret(cfg, NULL);
+#ifndef GSSAPI
if (!sensitive_data.have_ssh2_key) {
+#else
+ /* The GSSAPI key exchange can run without a host key */
+ if (!sensitive_data.have_ssh2_key && !options.gss_keyex) {
+#endif
logit("sshd: no hostkeys available -- exiting.");
exit(1);
}
@@ -2015,6 +2026,60 @@ main(int ac, char **av)
/* This is the child processing a new connection. */
setproctitle("%s", "[accepted]");
+#ifdef USE_SECURITY_SESSION_API
+ /*
+ * Create a new security session for use by the new user login if
+ * the current session is the root session or we are not launched
+ * by inetd (eg: debugging mode or server mode). We do not
+ * necessarily need to create a session if we are launched from
+ * inetd because Panther xinetd will create a session for us.
+ *
+ * The only case where this logic will fail is if there is an
+ * inetd running in a non-root session which is not creating
+ * new sessions for us. Then all the users will end up in the
+ * same session (bad).
+ *
+ * When the client exits, the session will be destroyed for us
+ * automatically.
+ *
+ * We must create the session before any credentials are stored
+ * (including AFS pags, which happens a few lines below).
+ */
+ {
+ OSStatus err = 0;
+ SecuritySessionId sid = 0;
+ SessionAttributeBits sattrs = 0;
+
+ err = SessionGetInfo(callerSecuritySession, &sid, &sattrs);
+ if (err)
+ error("SessionGetInfo() failed with error %.8X",
+ (unsigned) err);
+ else
+ debug("Current Session ID is %.8X / Session Attributes are %.8X",
+ (unsigned) sid, (unsigned) sattrs);
+
+ if (inetd_flag && !(sattrs & sessionIsRoot))
+ debug("Running in inetd mode in a non-root session... "
+ "assuming inetd created the session for us.");
+ else {
+ debug("Creating new security session...");
+ err = SessionCreate(0, sessionHasTTY | sessionIsRemote);
+ if (err)
+ error("SessionCreate() failed with error %.8X",
+ (unsigned) err);
+
+ err = SessionGetInfo(callerSecuritySession, &sid,
+ &sattrs);
+ if (err)
+ error("SessionGetInfo() failed with error %.8X",
+ (unsigned) err);
+ else
+ debug("New Session ID is %.8X / Session Attributes are %.8X",
+ (unsigned) sid, (unsigned) sattrs);
+ }
+ }
+#endif
+
/*
* Create a new session and process group since the 4.4BSD
* setlogin() affects the entire process group. We don't
@@ -2136,6 +2201,60 @@ main(int ac, char **av)
rdomain == NULL ? "" : "\"");
free(laddr);
+#ifdef USE_SECURITY_SESSION_API
+ /*
+ * Create a new security session for use by the new user login if
+ * the current session is the root session or we are not launched
+ * by inetd (eg: debugging mode or server mode). We do not
+ * necessarily need to create a session if we are launched from
+ * inetd because Panther xinetd will create a session for us.
+ *
+ * The only case where this logic will fail is if there is an
+ * inetd running in a non-root session which is not creating
+ * new sessions for us. Then all the users will end up in the
+ * same session (bad).
+ *
+ * When the client exits, the session will be destroyed for us
+ * automatically.
+ *
+ * We must create the session before any credentials are stored
+ * (including AFS pags, which happens a few lines below).
+ */
+ {
+ OSStatus err = 0;
+ SecuritySessionId sid = 0;
+ SessionAttributeBits sattrs = 0;
+
+ err = SessionGetInfo(callerSecuritySession, &sid, &sattrs);
+ if (err)
+ error("SessionGetInfo() failed with error %.8X",
+ (unsigned) err);
+ else
+ debug("Current Session ID is %.8X / Session Attributes are %.8X",
+ (unsigned) sid, (unsigned) sattrs);
+
+ if (inetd_flag && !(sattrs & sessionIsRoot))
+ debug("Running in inetd mode in a non-root session... "
+ "assuming inetd created the session for us.");
+ else {
+ debug("Creating new security session...");
+ err = SessionCreate(0, sessionHasTTY | sessionIsRemote);
+ if (err)
+ error("SessionCreate() failed with error %.8X",
+ (unsigned) err);
+
+ err = SessionGetInfo(callerSecuritySession, &sid,
+ &sattrs);
+ if (err)
+ error("SessionGetInfo() failed with error %.8X",
+ (unsigned) err);
+ else
+ debug("New Session ID is %.8X / Session Attributes are %.8X",
+ (unsigned) sid, (unsigned) sattrs);
+ }
+ }
+#endif
+
/*
* We don't want to listen forever unless the other side
* successfully authenticates itself. So we set up an alarm which is
@@ -2319,6 +2438,48 @@ do_ssh2_kex(void)
myproposal[PROPOSAL_SERVER_HOST_KEY_ALGS] = compat_pkalg_proposal(
list_hostkey_types());
+#ifdef GSSAPI
+ {
+ char *orig;
+ char *gss = NULL;
+ char *newstr = NULL;
+ orig = myproposal[PROPOSAL_KEX_ALGS];
+
+ /*
+ * If we don't have a host key, then there's no point advertising
+ * the other key exchange algorithms
+ */
+
+ if (strlen(myproposal[PROPOSAL_SERVER_HOST_KEY_ALGS]) == 0)
+ orig = NULL;
+
+ if (options.gss_keyex)
+ gss = ssh_gssapi_server_mechanisms();
+ else
+ gss = NULL;
+
+ if (gss && orig)
+ xasprintf(&newstr, "%s,%s", gss, orig);
+ else if (gss)
+ newstr = gss;
+ else if (orig)
+ newstr = orig;
+
+ /*
+ * If we've got GSSAPI mechanisms, then we've got the 'null' host
+ * key alg, but we can't tell people about it unless its the only
+ * host key algorithm we support
+ */
+ if (gss && (strlen(myproposal[PROPOSAL_SERVER_HOST_KEY_ALGS])) == 0)
+ myproposal[PROPOSAL_SERVER_HOST_KEY_ALGS] = "null";
+
+ if (newstr)
+ myproposal[PROPOSAL_KEX_ALGS] = newstr;
+ else
+ fatal("No supported key exchange algorithms");
+ }
+#endif
+
/* start key exchange */
if ((r = kex_setup(active_state, myproposal)) != 0)
fatal("kex_setup: %s", ssh_err(r));
@@ -2336,6 +2497,13 @@ do_ssh2_kex(void)
# endif
#endif
kex->kex[KEX_C25519_SHA256] = kexc25519_server;
+#ifdef GSSAPI
+ if (options.gss_keyex) {
+ kex->kex[KEX_GSS_GRP1_SHA1] = kexgss_server;
+ kex->kex[KEX_GSS_GRP14_SHA1] = kexgss_server;
+ kex->kex[KEX_GSS_GEX_SHA1] = kexgss_server;
+ }
+#endif
kex->server = 1;
kex->client_version_string=client_version_string;
kex->server_version_string=server_version_string;
Index: openssh-7.9p1/sshd_config
===================================================================
--- openssh-7.9p1.orig/sshd_config 2019-02-27 15:43:51.172514604 +0100
+++ openssh-7.9p1/sshd_config 2019-02-27 15:43:51.436516173 +0100
@@ -69,6 +69,8 @@ AuthorizedKeysFile .ssh/authorized_keys
# GSSAPI options
#GSSAPIAuthentication no
#GSSAPICleanupCredentials yes
+#GSSAPIStrictAcceptorCheck yes
+#GSSAPIKeyExchange no
# Set this to 'yes' to enable PAM authentication, account processing,
# and session processing. If this is enabled, PAM authentication will
Index: openssh-7.9p1/sshd_config.5
===================================================================
--- openssh-7.9p1.orig/sshd_config.5 2019-02-27 15:43:51.300515365 +0100
+++ openssh-7.9p1/sshd_config.5 2019-02-27 15:43:51.436516173 +0100
@@ -655,6 +655,11 @@ Specifies whether to automatically destr
on logout.
The default is
.Cm yes .
+.It Cm GSSAPIKeyExchange
+Specifies whether key exchange based on GSSAPI is allowed. GSSAPI key exchange
+doesn't rely on ssh keys to verify host identity.
+The default is
+.Dq no .
.It Cm GSSAPIStrictAcceptorCheck
Determines whether to be strict about the identity of the GSSAPI acceptor
a client authenticates against.
@@ -669,6 +674,11 @@ machine's default store.
This facility is provided to assist with operation on multi homed machines.
The default is
.Cm yes .
+.It Cm GSSAPIStoreCredentialsOnRekey
+Controls whether the user's GSSAPI credentials should be updated following a
+successful connection rekeying. This option can be used to accepted renewed
+or updated credentials from a compatible client. The default is
+.Dq no .
.It Cm HostbasedAcceptedKeyTypes
Specifies the key types that will be accepted for hostbased authentication
as a list of comma-separated patterns.
@@ -1627,16 +1637,16 @@ as a non-root user.
The default is
.Cm no .
.It Cm UsePAMCheckLocks
-When set to
+When set to
.Dq yes
, the checks whether the account has been locked with
.Pa passwd -l
-are performed even when PAM authentication is enabled via
+are performed even when PAM authentication is enabled via
.Cm UsePAM .
This is to ensure that it is not possible to log in with e.g. a
public key (in such a case PAM is used only to set up the session and some PAM
modules will not check whether the account is locked in this scenario). The
-default is
+default is
.Dq no .
.It Cm VersionAddendum
Optionally specifies additional text to append to the SSH protocol banner
Index: openssh-7.9p1/sshkey.c
===================================================================
--- openssh-7.9p1.orig/sshkey.c 2018-10-17 02:01:20.000000000 +0200
+++ openssh-7.9p1/sshkey.c 2019-02-27 15:43:55.360539487 +0100
@@ -135,6 +135,7 @@ static const struct keytype keytypes[] =
# endif /* OPENSSL_HAS_NISTP521 */
# endif /* OPENSSL_HAS_ECC */
#endif /* WITH_OPENSSL */
+ { "null", "null", NULL, KEY_NULL, 0, 0, 1 },
{ NULL, NULL, NULL, -1, -1, 0, 0 }
};
Index: openssh-7.9p1/sshkey.h
===================================================================
--- openssh-7.9p1.orig/sshkey.h 2018-10-17 02:01:20.000000000 +0200
+++ openssh-7.9p1/sshkey.h 2019-02-27 15:43:55.360539487 +0100
@@ -64,6 +64,7 @@ enum sshkey_types {
KEY_ED25519_CERT,
KEY_XMSS,
KEY_XMSS_CERT,
+ KEY_NULL,
KEY_UNSPEC
};
Index: openssh-7.9p1/sshd_config.0
===================================================================
--- openssh-7.9p1.orig/sshd_config.0 2019-02-27 15:43:51.300515365 +0100
+++ openssh-7.9p1/sshd_config.0 2019-02-27 15:43:51.436516173 +0100
@@ -380,6 +380,12 @@ DESCRIPTION
Specifies whether user authentication based on GSSAPI is allowed.
The default is no.
+ GSSAPIKeyExchange
+ Specifies whether key exchange based on GSSAPI is allowed. GSSAPI
+ key exchange doesn't rely on ssh keys to verify host identity. The
+ default is no.
+ Note that this option applies to protocol version 2 only.
+
GSSAPICleanupCredentials
Specifies whether to automatically destroy the user's credentials
cache on logout. The default is yes.
@@ -393,6 +399,12 @@ DESCRIPTION
facility is provided to assist with operation on multi homed
machines. The default is yes.
+ GSSAPIStoreCredentialsOnRekey
+ Controls whether the user's GSSAPI credentials should be updated
+ following a successful connection rekeying. This option can be used
+ to accepted renewed or updated credentials from a compatible
+ client. The default is no.
+
HostbasedAcceptedKeyTypes
Specifies the key types that will be accepted for hostbased
authentication as a list of comma-separated patterns.
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