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From aa8b6b2275fd14ba2cca3d2339ae61c7e7ddfa70 Mon Sep 17 00:00:00 2001
From: Simo Sorce <simo@redhat.com>
Date: Tue, 5 May 2020 14:08:48 -0400
Subject: [PATCH] Add Channel Binding support for GSSAPI/GSS-SPNEGO
Backport of commit ids:
829a6ed086432e26dafa9d1dcf892aef4c42cfbd
944bd8a6205f840b105206ef83e8f6b9dff0138e
Signed-off-by: Simo Sorce <simo@redhat.com>
---
plugins/gssapi.c | 30 +++++++++++---
tests/runtests.py | 93 ++++++++++++++++++++++++++++++++++++++++----
tests/t_common.c | 24 ++++++++----
tests/t_common.h | 5 ++-
tests/t_gssapi_cli.c | 24 ++++++++++--
tests/t_gssapi_srv.c | 24 ++++++++++--
6 files changed, 172 insertions(+), 28 deletions(-)
diff --git a/plugins/gssapi.c b/plugins/gssapi.c
index ff663da..5d900c5 100644
--- a/plugins/gssapi.c
+++ b/plugins/gssapi.c
@@ -830,7 +830,9 @@ gssapi_server_mech_authneg(context_t *text,
gss_buffer_desc name_without_realm;
gss_name_t client_name_MN = NULL, without = NULL;
gss_OID mech_type;
-
+ gss_channel_bindings_t bindings = GSS_C_NO_CHANNEL_BINDINGS;
+ struct gss_channel_bindings_struct cb = {0};
+
input_token = &real_input_token;
output_token = &real_output_token;
output_token->value = NULL; output_token->length = 0;
@@ -902,6 +904,12 @@ gssapi_server_mech_authneg(context_t *text,
real_input_token.length = clientinlen;
}
+ if (params->cbinding != NULL) {
+ cb.application_data.length = params->cbinding->len;
+ cb.application_data.value = params->cbinding->data;
+ bindings = &cb;
+ }
+
GSS_LOCK_MUTEX_CTX(params->utils, text);
maj_stat =
@@ -909,7 +917,7 @@ gssapi_server_mech_authneg(context_t *text,
&(text->gss_ctx),
server_creds,
input_token,
- GSS_C_NO_CHANNEL_BINDINGS,
+ bindings,
&text->client_name,
&mech_type,
output_token,
@@ -1505,7 +1513,8 @@ static sasl_server_plug_t gssapi_server_plugins[] =
| SASL_SEC_PASS_CREDENTIALS,
SASL_FEAT_WANT_CLIENT_FIRST
| SASL_FEAT_ALLOWS_PROXY
- | SASL_FEAT_DONTUSE_USERPASSWD, /* features */
+ | SASL_FEAT_DONTUSE_USERPASSWD
+ | SASL_FEAT_CHANNEL_BINDING, /* features */
NULL, /* glob_context */
&gssapi_server_mech_new, /* mech_new */
&gssapi_server_mech_step, /* mech_step */
@@ -1529,6 +1538,7 @@ static sasl_server_plug_t gssapi_server_plugins[] =
SASL_FEAT_WANT_CLIENT_FIRST
| SASL_FEAT_ALLOWS_PROXY
| SASL_FEAT_DONTUSE_USERPASSWD
+ | SASL_FEAT_CHANNEL_BINDING
| SASL_FEAT_SUPPORTS_HTTP, /* features */
&gss_spnego_oid, /* glob_context */
&gssapi_server_mech_new, /* mech_new */
@@ -1662,6 +1672,8 @@ static int gssapi_client_mech_step(void *conn_context,
input_token->value = NULL;
input_token->length = 0;
gss_cred_id_t client_creds = (gss_cred_id_t)params->gss_creds;
+ gss_channel_bindings_t bindings = GSS_C_NO_CHANNEL_BINDINGS;
+ struct gss_channel_bindings_struct cb = {0};
if (clientout)
*clientout = NULL;
@@ -1777,6 +1789,12 @@ static int gssapi_client_mech_step(void *conn_context,
req_flags = req_flags | GSS_C_DELEG_FLAG;
}
+ if (params->cbinding != NULL) {
+ cb.application_data.length = params->cbinding->len;
+ cb.application_data.value = params->cbinding->data;
+ bindings = &cb;
+ }
+
GSS_LOCK_MUTEX_CTX(params->utils, text);
maj_stat = gss_init_sec_context(&min_stat,
client_creds, /* GSS_C_NO_CREDENTIAL */
@@ -1785,7 +1803,7 @@ static int gssapi_client_mech_step(void *conn_context,
text->mech_type,
req_flags,
0,
- GSS_C_NO_CHANNEL_BINDINGS,
+ bindings,
input_token,
NULL,
output_token,
@@ -2190,7 +2208,8 @@ static sasl_client_plug_t gssapi_client_plugins[] =
| SASL_SEC_PASS_CREDENTIALS, /* security_flags */
SASL_FEAT_NEEDSERVERFQDN
| SASL_FEAT_WANT_CLIENT_FIRST
- | SASL_FEAT_ALLOWS_PROXY, /* features */
+ | SASL_FEAT_ALLOWS_PROXY
+ | SASL_FEAT_CHANNEL_BINDING, /* features */
gssapi_required_prompts, /* required_prompts */
GSS_C_NO_OID, /* glob_context */
&gssapi_client_mech_new, /* mech_new */
@@ -2213,6 +2232,7 @@ static sasl_client_plug_t gssapi_client_plugins[] =
SASL_FEAT_NEEDSERVERFQDN
| SASL_FEAT_WANT_CLIENT_FIRST
| SASL_FEAT_ALLOWS_PROXY
+ | SASL_FEAT_CHANNEL_BINDING
| SASL_FEAT_SUPPORTS_HTTP, /* features */
gssapi_required_prompts, /* required_prompts */
&gss_spnego_oid, /* glob_context */
diff --git a/tests/runtests.py b/tests/runtests.py
index f645adf..fc9cf24 100755
--- a/tests/runtests.py
+++ b/tests/runtests.py
@@ -1,6 +1,7 @@
#!/usr/bin/python3
import argparse
+import base64
import os
import shutil
import signal
@@ -126,14 +127,7 @@ def setup_kdc(testdir, env):
return kdc, env
-
-def gssapi_tests(testdir):
- """ SASL/GSSAPI Tests """
- env = setup_socket_wrappers(testdir)
- kdc, kenv = setup_kdc(testdir, env)
- #print("KDC: {}, ENV: {}".format(kdc, kenv))
- kenv['KRB5_TRACE'] = os.path.join(testdir, 'trace.log')
-
+def gssapi_basic_test(kenv):
try:
srv = subprocess.Popen(["../tests/t_gssapi_srv"],
stdout=subprocess.PIPE,
@@ -155,11 +149,94 @@ def gssapi_tests(testdir):
srv.returncode, srv.stderr.read().decode('utf-8')))
except Exception as e:
print("FAIL: {}".format(e))
+ return
+
+ print("PASS: CLI({}) SRV({})".format(
+ cli.stdout.read().decode('utf-8').strip(),
+ srv.stdout.read().decode('utf-8').strip()))
+
+def gssapi_channel_binding_test(kenv):
+ try:
+ bindings = base64.b64encode("MATCHING CBS".encode('utf-8'))
+ srv = subprocess.Popen(["../tests/t_gssapi_srv", "-c", bindings],
+ stdout=subprocess.PIPE,
+ stderr=subprocess.PIPE, env=kenv)
+ srv.stdout.readline() # Wait for srv to say it is ready
+ cli = subprocess.Popen(["../tests/t_gssapi_cli", "-c", bindings],
+ stdout=subprocess.PIPE,
+ stderr=subprocess.PIPE, env=kenv)
+ try:
+ cli.wait(timeout=5)
+ srv.wait(timeout=5)
+ except Exception as e:
+ print("Failed on {}".format(e));
+ cli.kill()
+ srv.kill()
+ if cli.returncode != 0 or srv.returncode != 0:
+ raise Exception("CLI ({}): {} --> SRV ({}): {}".format(
+ cli.returncode, cli.stderr.read().decode('utf-8'),
+ srv.returncode, srv.stderr.read().decode('utf-8')))
+ except Exception as e:
+ print("FAIL: {}".format(e))
+ return
print("PASS: CLI({}) SRV({})".format(
cli.stdout.read().decode('utf-8').strip(),
srv.stdout.read().decode('utf-8').strip()))
+def gssapi_channel_binding_mismatch_test(kenv):
+ result = "FAIL"
+ try:
+ bindings = base64.b64encode("SRV CBS".encode('utf-8'))
+ srv = subprocess.Popen(["../tests/t_gssapi_srv", "-c", bindings],
+ stdout=subprocess.PIPE,
+ stderr=subprocess.PIPE, env=kenv)
+ srv.stdout.readline() # Wait for srv to say it is ready
+ bindings = base64.b64encode("CLI CBS".encode('utf-8'))
+ cli = subprocess.Popen(["../tests/t_gssapi_cli", "-c", bindings],
+ stdout=subprocess.PIPE,
+ stderr=subprocess.PIPE, env=kenv)
+ try:
+ cli.wait(timeout=5)
+ srv.wait(timeout=5)
+ except Exception as e:
+ print("Failed on {}".format(e));
+ cli.kill()
+ srv.kill()
+ if cli.returncode != 0 or srv.returncode != 0:
+ cli_err = cli.stderr.read().decode('utf-8').strip()
+ srv_err = srv.stderr.read().decode('utf-8').strip()
+ if "authentication failure" in srv_err:
+ result = "PASS"
+ raise Exception("CLI ({}): {} --> SRV ({}): {}".format(
+ cli.returncode, cli_err, srv.returncode, srv_err))
+ except Exception as e:
+ print("{}: {}".format(result, e))
+ return
+
+ print("FAIL: This test should fail [CLI({}) SRV({})]".format(
+ cli.stdout.read().decode('utf-8').strip(),
+ srv.stdout.read().decode('utf-8').strip()))
+
+def gssapi_tests(testdir):
+ """ SASL/GSSAPI Tests """
+ env = setup_socket_wrappers(testdir)
+ kdc, kenv = setup_kdc(testdir, env)
+ #print("KDC: {}, ENV: {}".format(kdc, kenv))
+ kenv['KRB5_TRACE'] = os.path.join(testdir, 'trace.log')
+
+ print('GSSAPI BASIC:')
+ print(' ', end='')
+ gssapi_basic_test(kenv)
+
+ print('GSSAPI CHANNEL BINDING:')
+ print(' ', end='')
+ gssapi_channel_binding_test(kenv)
+
+ print('GSSAPI CHANNEL BINDING MISMTACH:')
+ print(' ', end='')
+ gssapi_channel_binding_mismatch_test(kenv)
+
os.killpg(kdc.pid, signal.SIGTERM)
diff --git a/tests/t_common.c b/tests/t_common.c
index 7168b2f..478e6a1 100644
--- a/tests/t_common.c
+++ b/tests/t_common.c
@@ -1,4 +1,5 @@
-/* TBD, add (C) */
+/* Copyright (C) Simo Sorce <simo@redhat.com>
+ * See COPYING file for License */
#include <t_common.h>
@@ -13,9 +14,6 @@ void send_string(int sd, const char *s, unsigned int l)
{
ssize_t ret;
-fprintf(stderr, "s:%u ", l);
-fflush(stderr);
-
ret = send(sd, &l, sizeof(l), 0);
if (ret != sizeof(l)) s_error("send size", ret, sizeof(l), errno);
@@ -34,8 +32,6 @@ void recv_string(int sd, char *buf, unsigned int *buflen)
if (ret != sizeof(l)) s_error("recv size", ret, sizeof(l), errno);
if (l == 0) {
-fprintf(stderr, "r:0 ");
-fflush(stderr);
*buflen = 0;
return;
}
@@ -45,8 +41,6 @@ fflush(stderr);
ret = recv(sd, buf, l, 0);
if (ret != l) s_error("recv data", ret, l, errno);
-fprintf(stderr, "r:%ld ", ret);
-fflush(stderr);
*buflen = ret;
}
@@ -65,4 +59,18 @@ int getpath(void *context __attribute__((unused)), const char **path)
return SASL_OK;
}
+void parse_cb(sasl_channel_binding_t *cb, char *buf, unsigned max, char *in)
+{
+ unsigned len;
+ int r;
+ r = sasl_decode64(in, strlen(in), buf, max, &len);
+ if (r != SASL_OK) {
+ saslerr(r, "failed to parse channel bindings");
+ exit(-1);
+ }
+ cb->name = "TEST BINDINGS";
+ cb->critical = 0;
+ cb->data = (unsigned char *)buf;
+ cb->len = len;
+}
diff --git a/tests/t_common.h b/tests/t_common.h
index 4ee1976..a10def1 100644
--- a/tests/t_common.h
+++ b/tests/t_common.h
@@ -1,4 +1,5 @@
-/* TBD, add (C) */
+/* Copyright (C) Simo Sorce <simo@redhat.com>
+ * See COPYING file for License */
#include "config.h"
@@ -7,9 +8,11 @@
#include <sys/socket.h>
#include <sasl.h>
+#include <saslutil.h>
void s_error(const char *hdr, ssize_t ret, ssize_t len, int err);
void send_string(int sd, const char *s, unsigned int l);
void recv_string(int sd, char *buf, unsigned int *buflen);
void saslerr(int why, const char *what);
int getpath(void *context __attribute__((unused)), const char **path);
+void parse_cb(sasl_channel_binding_t *cb, char *buf, unsigned max, char *in);
diff --git a/tests/t_gssapi_cli.c b/tests/t_gssapi_cli.c
index c833c05..a44a3f5 100644
--- a/tests/t_gssapi_cli.c
+++ b/tests/t_gssapi_cli.c
@@ -1,4 +1,5 @@
-/* TBD, add (C) */
+/* Copyright (C) Simo Sorce <simo@redhat.com>
+ * See COPYING file for License */
#include "t_common.h"
@@ -13,6 +14,7 @@
#include <arpa/inet.h>
#include <saslplug.h>
+#include <saslutil.h>
static int setup_socket(void)
{
@@ -32,7 +34,7 @@ static int setup_socket(void)
return sock;
}
-int main(int argc __attribute__((unused)), char *argv[] __attribute__((unused)))
+int main(int argc, char *argv[])
{
sasl_callback_t callbacks[2] = {};
char buf[8192];
@@ -40,8 +42,20 @@ int main(int argc __attribute__((unused)), char *argv[] __attribute__((unused)))
sasl_conn_t *conn;
const char *data;
unsigned int len;
+ sasl_channel_binding_t cb = {0};
+ char cb_buf[256];
int sd;
- int r;
+ int c, r;
+
+ while ((c = getopt(argc, argv, "c:")) != EOF) {
+ switch (c) {
+ case 'c':
+ parse_cb(&cb, cb_buf, 256, optarg);
+ break;
+ default:
+ break;
+ }
+ }
/* initialize the sasl library */
callbacks[0].id = SASL_CB_GETPATH;
@@ -60,6 +74,10 @@ int main(int argc __attribute__((unused)), char *argv[] __attribute__((unused)))
exit(-1);
}
+ if (cb.name) {
+ sasl_setprop(conn, SASL_CHANNEL_BINDING, &cb);
+ }
+
r = sasl_client_start(conn, "GSSAPI", NULL, &data, &len, &chosenmech);
if (r != SASL_OK && r != SASL_CONTINUE) {
saslerr(r, "starting SASL negotiation");
diff --git a/tests/t_gssapi_srv.c b/tests/t_gssapi_srv.c
index 29f538d..ef1217f 100644
--- a/tests/t_gssapi_srv.c
+++ b/tests/t_gssapi_srv.c
@@ -1,4 +1,5 @@
-/* TBD, add (C) */
+/* Copyright (C) Simo Sorce <simo@redhat.com>
+ * See COPYING file for License */
#include "t_common.h"
@@ -44,15 +45,28 @@ static int setup_socket(void)
return sd;
}
-int main(int argc __attribute__((unused)), char *argv[] __attribute__((unused)))
+int main(int argc, char *argv[])
{
sasl_callback_t callbacks[2] = {};
char buf[8192];
sasl_conn_t *conn;
const char *data;
unsigned int len;
+ sasl_channel_binding_t cb = {0};
+ unsigned char cb_buf[256];
int sd;
- int r;
+ int c, r;
+
+ while ((c = getopt(argc, argv, "c:")) != EOF) {
+ switch (c) {
+ case 'c':
+ parse_cb(&cb, cb_buf, 256, optarg);
+ break;
+ default:
+ break;
+ }
+ }
+
/* initialize the sasl library */
callbacks[0].id = SASL_CB_GETPATH;
@@ -72,6 +86,10 @@ int main(int argc __attribute__((unused)), char *argv[] __attribute__((unused)))
exit(-1);
}
+ if (cb.name) {
+ sasl_setprop(conn, SASL_CHANNEL_BINDING, &cb);
+ }
+
sd = setup_socket();
len = 8192;
--
2.18.2
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