2 Unix SMB/CIFS implementation.
4 GSSAPI KRB5 backend for GENSEC
6 Copyright (C) Andrew Bartlett <abartlet@samba.org> 2004
7 Copyright (C) Stefan Metzmacher <metze@samba.org> 2005
9 This program is free software; you can redistribute it and/or modify
10 it under the terms of the GNU General Public License as published by
11 the Free Software Foundation; either version 2 of the License, or
12 (at your option) any later version.
14 This program is distributed in the hope that it will be useful,
15 but WITHOUT ANY WARRANTY; without even the implied warranty of
16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 GNU General Public License for more details.
19 You should have received a copy of the GNU General Public License
20 along with this program; if not, write to the Free Software
21 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
25 #include "system/kerberos.h"
26 #include "system/time.h"
27 #include "libcli/auth/kerberos.h"
28 #include "auth/auth.h"
30 static const gss_OID_desc gensec_gss_krb5_mechanism_oid_desc =
31 {9, (void *)discard_const_p(char, "\x2a\x86\x48\x86\xf7\x12\x01\x02\x02")};
33 enum GENSEC_GSSKRB5_STATE {
34 GENSEC_GSSKRB5_CLIENT_START,
35 GENSEC_GSSKRB5_CLIENT_MUTUAL_AUTH,
36 GENSEC_GSSKRB5_CLIENT_DCE_STYLE,
40 struct gensec_gsskrb5_state {
41 enum GENSEC_GSSKRB5_STATE state_position;
42 gss_ctx_id_t gssapi_context;
43 struct gss_channel_bindings_struct *input_chan_bindings;
44 gss_name_t server_name;
45 gss_name_t client_name;
46 OM_uint32 want_flags, got_flags;
49 static int gensec_gsskrb5_destory(void *ptr)
51 struct gensec_gsskrb5_state *gensec_gsskrb5_state = ptr;
52 OM_uint32 maj_stat, min_stat;
54 if (gensec_gsskrb5_state->gssapi_context != GSS_C_NO_CONTEXT) {
55 maj_stat = gss_delete_sec_context (&min_stat,
56 &gensec_gsskrb5_state->gssapi_context,
60 if (gensec_gsskrb5_state->server_name != GSS_C_NO_NAME) {
61 maj_stat = gss_release_name(&min_stat, &gensec_gsskrb5_state->server_name);
63 if (gensec_gsskrb5_state->client_name != GSS_C_NO_NAME) {
64 maj_stat = gss_release_name(&min_stat, &gensec_gsskrb5_state->client_name);
69 static NTSTATUS gensec_gsskrb5_start(struct gensec_security *gensec_security)
71 struct gensec_gsskrb5_state *gensec_gsskrb5_state;
73 gensec_gsskrb5_state = talloc(gensec_security, struct gensec_gsskrb5_state);
74 if (!gensec_gsskrb5_state) {
75 return NT_STATUS_NO_MEMORY;
78 gensec_security->private_data = gensec_gsskrb5_state;
80 gensec_gsskrb5_state->gssapi_context = GSS_C_NO_CONTEXT;
81 gensec_gsskrb5_state->server_name = GSS_C_NO_NAME;
82 gensec_gsskrb5_state->client_name = GSS_C_NO_NAME;
84 talloc_set_destructor(gensec_gsskrb5_state, gensec_gsskrb5_destory);
86 /* TODO: Fill in channel bindings */
87 gensec_gsskrb5_state->input_chan_bindings = GSS_C_NO_CHANNEL_BINDINGS;
89 gensec_gsskrb5_state->want_flags = GSS_C_MUTUAL_FLAG;
90 gensec_gsskrb5_state->got_flags = 0;
92 if (gensec_security->want_features & GENSEC_FEATURE_SESSION_KEY) {
93 /* GSSAPI won't give us the session keys */
94 return NT_STATUS_INVALID_PARAMETER;
96 if (gensec_security->want_features & GENSEC_FEATURE_SIGN) {
97 gensec_gsskrb5_state->want_flags |= GSS_C_INTEG_FLAG;
99 if (gensec_security->want_features & GENSEC_FEATURE_SEAL) {
100 gensec_gsskrb5_state->want_flags |= GSS_C_CONF_FLAG;
102 if (gensec_security->want_features & GENSEC_FEATURE_DCE_STYLE) {
103 gensec_gsskrb5_state->want_flags |= GSS_C_DCE_STYLE;
109 static NTSTATUS gensec_gsskrb5_client_start(struct gensec_security *gensec_security)
111 struct gensec_gsskrb5_state *gensec_gsskrb5_state;
113 gss_buffer_desc name_token;
114 OM_uint32 maj_stat, min_stat;
116 gss_OID_desc hostbased = {10,
117 (void *)discard_const_p(char, "\x2a\x86\x48\x86\xf7\x12"
118 "\x01\x02\x01\x04")};
120 nt_status = gensec_gsskrb5_start(gensec_security);
121 if (!NT_STATUS_IS_OK(nt_status)) {
125 gensec_gsskrb5_state = gensec_security->private_data;
127 gensec_gsskrb5_state->state_position = GENSEC_GSSKRB5_CLIENT_START;
129 name_token.value = talloc_asprintf(gensec_gsskrb5_state, "%s@%s", gensec_get_target_service(gensec_security),
130 gensec_get_target_hostname(gensec_security));
131 DEBUG(0, ("name: %s\n", (char *)name_token.value));
132 name_token.length = strlen(name_token.value);
134 maj_stat = gss_import_name (&min_stat,
137 &gensec_gsskrb5_state->server_name);
139 return NT_STATUS_UNSUCCESSFUL;
146 * Next state function for the GSSKRB5 GENSEC mechanism
148 * @param gensec_gsskrb5_state GSSAPI State
149 * @param out_mem_ctx The TALLOC_CTX for *out to be allocated on
150 * @param in The request, as a DATA_BLOB
151 * @param out The reply, as an talloc()ed DATA_BLOB, on *out_mem_ctx
152 * @return Error, MORE_PROCESSING_REQUIRED if a reply is sent,
153 * or NT_STATUS_OK if the user is authenticated.
156 static NTSTATUS gensec_gsskrb5_update(struct gensec_security *gensec_security,
157 TALLOC_CTX *out_mem_ctx,
158 const DATA_BLOB in, DATA_BLOB *out)
160 struct gensec_gsskrb5_state *gensec_gsskrb5_state = gensec_security->private_data;
161 NTSTATUS nt_status = NT_STATUS_UNSUCCESSFUL;
162 OM_uint32 maj_stat, min_stat;
164 gss_buffer_desc input_token, output_token;
166 *out = data_blob(NULL, 0);
168 input_token.length = in.length;
169 input_token.value = in.data;
171 switch (gensec_gsskrb5_state->state_position) {
172 case GENSEC_GSSKRB5_CLIENT_START:
174 maj_stat = gss_init_sec_context(&min_stat,
176 &gensec_gsskrb5_state->gssapi_context,
177 gensec_gsskrb5_state->server_name,
178 discard_const_p(gss_OID_desc, &gensec_gss_krb5_mechanism_oid_desc),
179 gensec_gsskrb5_state->want_flags,
181 gensec_gsskrb5_state->input_chan_bindings,
185 &gensec_gsskrb5_state->got_flags, /* ret flags */
187 *out = data_blob_talloc(out_mem_ctx, output_token.value, output_token.length);
188 if (out->length != output_token.length) {
189 gss_release_buffer(&min_stat2, &output_token);
190 return NT_STATUS_NO_MEMORY;
192 gss_release_buffer(&min_stat2, &output_token);
194 if (maj_stat == GSS_S_COMPLETE) {
195 gensec_gsskrb5_state->state_position = GENSEC_GSSKRB5_DONE;
197 } else if (maj_stat == GSS_S_CONTINUE_NEEDED) {
198 gensec_gsskrb5_state->state_position = GENSEC_GSSKRB5_CLIENT_MUTUAL_AUTH;
199 return NT_STATUS_MORE_PROCESSING_REQUIRED;
201 gss_buffer_desc msg1, msg2;
202 OM_uint32 msg_ctx = 0;
206 gss_display_status(&min_stat2, maj_stat, GSS_C_GSS_CODE,
207 GSS_C_NULL_OID, &msg_ctx, &msg1);
208 gss_display_status(&min_stat2, min_stat, GSS_C_MECH_CODE,
209 GSS_C_NULL_OID, &msg_ctx, &msg2);
210 DEBUG(1, ("gensec_gsskrb5_update: %s : %s\n", (char *)msg1.value, (char *)msg2.value));
211 gss_release_buffer(&min_stat2, &msg1);
212 gss_release_buffer(&min_stat2, &msg2);
218 case GENSEC_GSSKRB5_CLIENT_MUTUAL_AUTH:
220 maj_stat = gss_init_sec_context(&min_stat,
222 &gensec_gsskrb5_state->gssapi_context,
223 gensec_gsskrb5_state->server_name,
224 discard_const_p(gss_OID_desc, &gensec_gss_krb5_mechanism_oid_desc),
225 gensec_gsskrb5_state->want_flags,
227 gensec_gsskrb5_state->input_chan_bindings,
231 &gensec_gsskrb5_state->got_flags, /* ret flags */
233 *out = data_blob_talloc(out_mem_ctx, output_token.value, output_token.length);
234 if (out->length != output_token.length) {
235 gss_release_buffer(&min_stat2, &output_token);
236 return NT_STATUS_NO_MEMORY;
238 gss_release_buffer(&min_stat2, &output_token);
240 if (maj_stat == GSS_S_COMPLETE) {
241 if (gensec_gsskrb5_state->got_flags & GSS_C_DCE_STYLE) {
242 gensec_gsskrb5_state->state_position = GENSEC_GSSKRB5_CLIENT_DCE_STYLE;
243 return NT_STATUS_MORE_PROCESSING_REQUIRED;
245 gensec_gsskrb5_state->state_position = GENSEC_GSSKRB5_DONE;
247 } else if (maj_stat == GSS_S_CONTINUE_NEEDED) {
248 gensec_gsskrb5_state->state_position = GENSEC_GSSKRB5_CLIENT_DCE_STYLE;
249 return NT_STATUS_MORE_PROCESSING_REQUIRED;
251 gss_buffer_desc msg1, msg2;
252 OM_uint32 msg_ctx = 0;
256 gss_display_status(&min_stat2, maj_stat, GSS_C_GSS_CODE,
257 GSS_C_NULL_OID, &msg_ctx, &msg1);
258 gss_display_status(&min_stat2, min_stat, GSS_C_MECH_CODE,
259 GSS_C_NULL_OID, &msg_ctx, &msg2);
260 DEBUG(1, ("gensec_gsskrb5_update: %s : %s\n", (char *)msg1.value, (char *)msg2.value));
261 gss_release_buffer(&min_stat2, &msg1);
262 gss_release_buffer(&min_stat2, &msg2);
268 case GENSEC_GSSKRB5_CLIENT_DCE_STYLE:
270 gensec_gsskrb5_state->state_position = GENSEC_GSSKRB5_DONE;
273 case GENSEC_GSSKRB5_DONE:
278 return NT_STATUS_INVALID_PARAMETER;
281 return NT_STATUS_INVALID_PARAMETER;
284 static NTSTATUS gensec_gsskrb5_wrap(struct gensec_security *gensec_security,
289 struct gensec_gsskrb5_state *gensec_gsskrb5_state = gensec_security->private_data;
290 OM_uint32 maj_stat, min_stat;
291 gss_buffer_desc input_token, output_token;
293 input_token.length = in->length;
294 input_token.value = in->data;
296 maj_stat = gss_wrap(&min_stat,
297 gensec_gsskrb5_state->gssapi_context,
298 gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL),
303 if (GSS_ERROR(maj_stat)) {
304 return NT_STATUS_ACCESS_DENIED;
306 *out = data_blob_talloc(mem_ctx, output_token.value, output_token.length);
308 gss_release_buffer(&min_stat, &output_token);
310 if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)
312 return NT_STATUS_ACCESS_DENIED;
317 static NTSTATUS gensec_gsskrb5_unwrap(struct gensec_security *gensec_security,
322 struct gensec_gsskrb5_state *gensec_gsskrb5_state = gensec_security->private_data;
323 OM_uint32 maj_stat, min_stat;
324 gss_buffer_desc input_token, output_token;
327 input_token.length = in->length;
328 input_token.value = in->data;
330 maj_stat = gss_unwrap(&min_stat,
331 gensec_gsskrb5_state->gssapi_context,
336 if (GSS_ERROR(maj_stat)) {
337 return NT_STATUS_ACCESS_DENIED;
339 *out = data_blob_talloc(mem_ctx, output_token.value, output_token.length);
341 gss_release_buffer(&min_stat, &output_token);
343 if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)
345 return NT_STATUS_ACCESS_DENIED;
350 static size_t gensec_gsskrb5_sig_size(struct gensec_security *gensec_security)
352 /* not const but work for DCERPC packets and arcfour */
356 static NTSTATUS gensec_gsskrb5_seal_packet(struct gensec_security *gensec_security,
358 uint8_t *data, size_t length,
359 const uint8_t *whole_pdu, size_t pdu_length,
362 struct gensec_gsskrb5_state *gensec_gsskrb5_state = gensec_security->private_data;
363 OM_uint32 maj_stat, min_stat;
364 gss_buffer_desc input_token, output_token;
366 ssize_t sig_length = 0;
368 input_token.length = length;
369 input_token.value = data;
371 maj_stat = gss_wrap(&min_stat,
372 gensec_gsskrb5_state->gssapi_context,
373 gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL),
378 if (GSS_ERROR(maj_stat)) {
379 return NT_STATUS_ACCESS_DENIED;
382 if (output_token.length < length) {
383 return NT_STATUS_INTERNAL_ERROR;
388 memcpy(data, ((uint8_t *)output_token.value) + sig_length, length);
389 *sig = data_blob_talloc(mem_ctx, (uint8_t *)output_token.value, sig_length);
391 DEBUG(0,("gensec_gsskrb5_seal_packet: siglen: %d inlen: %d, wrap_len: %d\n", sig->length, length, output_token.length - sig_length));
392 dump_data(0,sig->data, sig->length);
393 dump_data(0,data, length);
394 dump_data(0,((uint8_t *)output_token.value) + sig_length, output_token.length - sig_length);
396 gss_release_buffer(&min_stat, &output_token);
398 if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)
400 return NT_STATUS_ACCESS_DENIED;
405 static NTSTATUS gensec_gsskrb5_unseal_packet(struct gensec_security *gensec_security,
407 uint8_t *data, size_t length,
408 const uint8_t *whole_pdu, size_t pdu_length,
411 struct gensec_gsskrb5_state *gensec_gsskrb5_state = gensec_security->private_data;
412 OM_uint32 maj_stat, min_stat;
413 gss_buffer_desc input_token, output_token;
418 DEBUG(0,("gensec_gsskrb5_unseal_packet: siglen: %d\n", sig->length));
419 dump_data(0,sig->data, sig->length);
421 in = data_blob_talloc(mem_ctx, NULL, sig->length + length);
423 memcpy(in.data, sig->data, sig->length);
424 memcpy(in.data + sig->length, data, length);
426 input_token.length = in.length;
427 input_token.value = in.data;
429 maj_stat = gss_unwrap(&min_stat,
430 gensec_gsskrb5_state->gssapi_context,
435 if (GSS_ERROR(maj_stat)) {
436 return NT_STATUS_ACCESS_DENIED;
439 if (output_token.length != length) {
440 return NT_STATUS_INTERNAL_ERROR;
443 memcpy(data, output_token.value, length);
445 gss_release_buffer(&min_stat, &output_token);
447 if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)
449 return NT_STATUS_ACCESS_DENIED;
454 static NTSTATUS gensec_gsskrb5_sign_packet(struct gensec_security *gensec_security,
456 const uint8_t *data, size_t length,
457 const uint8_t *whole_pdu, size_t pdu_length,
460 struct gensec_gsskrb5_state *gensec_gsskrb5_state = gensec_security->private_data;
461 OM_uint32 maj_stat, min_stat;
462 gss_buffer_desc input_token, output_token;
464 ssize_t sig_length = 0;
466 input_token.length = length;
467 input_token.value = data;
469 maj_stat = gss_wrap(&min_stat,
470 gensec_gsskrb5_state->gssapi_context,
476 if (GSS_ERROR(maj_stat)) {
477 return NT_STATUS_ACCESS_DENIED;
480 if (output_token.length < length) {
481 return NT_STATUS_INTERNAL_ERROR;
486 /*memcpy(data, ((uint8_t *)output_token.value) + sig_length, length);*/
487 *sig = data_blob_talloc(mem_ctx, (uint8_t *)output_token.value, sig_length);
489 DEBUG(0,("gensec_gsskrb5_sign_packet: siglen: %d\n", sig->length));
490 dump_data(0,sig->data, sig->length);
492 gss_release_buffer(&min_stat, &output_token);
497 static NTSTATUS gensec_gsskrb5_check_packet(struct gensec_security *gensec_security,
499 const uint8_t *data, size_t length,
500 const uint8_t *whole_pdu, size_t pdu_length,
501 const DATA_BLOB *sig)
503 struct gensec_gsskrb5_state *gensec_gsskrb5_state = gensec_security->private_data;
504 OM_uint32 maj_stat, min_stat;
505 gss_buffer_desc input_token, output_token;
510 DEBUG(0,("gensec_gsskrb5_check_packet: siglen: %d\n", sig->length));
511 dump_data(0,sig->data, sig->length);
513 in = data_blob_talloc(mem_ctx, NULL, sig->length + length);
515 memcpy(in.data, sig->data, sig->length);
516 memcpy(in.data + sig->length, data, length);
518 input_token.length = in.length;
519 input_token.value = in.data;
521 maj_stat = gss_unwrap(&min_stat,
522 gensec_gsskrb5_state->gssapi_context,
527 if (GSS_ERROR(maj_stat)) {
528 return NT_STATUS_ACCESS_DENIED;
531 if (output_token.length != length) {
532 return NT_STATUS_INTERNAL_ERROR;
535 /*memcpy(data, output_token.value, length);*/
537 gss_release_buffer(&min_stat, &output_token);
542 static BOOL gensec_gsskrb5_have_feature(struct gensec_security *gensec_security,
545 struct gensec_gsskrb5_state *gensec_gsskrb5_state = gensec_security->private_data;
546 if (feature & GENSEC_FEATURE_SIGN) {
547 return gensec_gsskrb5_state->got_flags & GSS_C_INTEG_FLAG;
549 if (feature & GENSEC_FEATURE_SEAL) {
550 return gensec_gsskrb5_state->got_flags & GSS_C_CONF_FLAG;
555 static const struct gensec_security_ops gensec_gsskrb5_security_ops = {
557 .auth_type = DCERPC_AUTH_TYPE_KRB5,
558 .oid = GENSEC_OID_KERBEROS5,
559 .client_start = gensec_gsskrb5_client_start,
560 .update = gensec_gsskrb5_update,
561 .sig_size = gensec_gsskrb5_sig_size,
562 .sign_packet = gensec_gsskrb5_sign_packet,
563 .check_packet = gensec_gsskrb5_check_packet,
564 .seal_packet = gensec_gsskrb5_seal_packet,
565 .unseal_packet = gensec_gsskrb5_unseal_packet,
566 .wrap = gensec_gsskrb5_wrap,
567 .unwrap = gensec_gsskrb5_unwrap,
568 .have_feature = gensec_gsskrb5_have_feature,
572 NTSTATUS gensec_gsskrb5_init(void)
576 ret = gensec_register(&gensec_gsskrb5_security_ops);
577 if (!NT_STATUS_IS_OK(ret)) {
578 DEBUG(0,("Failed to register '%s' gensec backend!\n",
579 gensec_gsskrb5_security_ops.name));