2 Unix SMB/CIFS implementation.
4 Kerberos backend for GENSEC
6 Copyright (C) Andrew Bartlett <abartlet@samba.org> 2004
7 Copyright (C) Andrew Tridgell 2001
8 Copyright (C) Luke Howard 2002-2003
9 Copyright (C) Stefan Metzmacher 2004-2005
11 This program is free software; you can redistribute it and/or modify
12 it under the terms of the GNU General Public License as published by
13 the Free Software Foundation; either version 3 of the License, or
14 (at your option) any later version.
16 This program is distributed in the hope that it will be useful,
17 but WITHOUT ANY WARRANTY; without even the implied warranty of
18 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19 GNU General Public License for more details.
22 You should have received a copy of the GNU General Public License
23 along with this program. If not, see <http://www.gnu.org/licenses/>.
27 #include "system/kerberos.h"
28 #include "auth/kerberos/kerberos.h"
29 #include "auth/auth.h"
30 #include "lib/socket/socket.h"
31 #include "lib/tsocket/tsocket.h"
32 #include "librpc/gen_ndr/dcerpc.h"
33 #include "auth/credentials/credentials.h"
34 #include "auth/credentials/credentials_krb5.h"
35 #include "auth/kerberos/kerberos_credentials.h"
36 #include "auth/gensec/gensec.h"
37 #include "auth/gensec/gensec_internal.h"
38 #include "auth/gensec/gensec_proto.h"
39 #include "auth/gensec/gensec_toplevel_proto.h"
40 #include "param/param.h"
41 #include "auth/auth_sam_reply.h"
42 #include "lib/util/util_net.h"
43 #include "../lib/util/asn1.h"
44 #include "auth/kerberos/pac_utils.h"
45 #include "gensec_krb5_util.h"
47 _PUBLIC_ NTSTATUS gensec_krb5_init(void);
49 enum GENSEC_KRB5_STATE {
50 GENSEC_KRB5_SERVER_START,
51 GENSEC_KRB5_CLIENT_START,
52 GENSEC_KRB5_CLIENT_MUTUAL_AUTH,
56 struct gensec_krb5_state {
57 enum GENSEC_KRB5_STATE state_position;
58 struct smb_krb5_context *smb_krb5_context;
59 krb5_auth_context auth_context;
61 krb5_keyblock *keyblock;
64 krb5_flags ap_req_options;
67 static int gensec_krb5_destroy(struct gensec_krb5_state *gensec_krb5_state)
69 if (!gensec_krb5_state->smb_krb5_context) {
70 /* We can't clean anything else up unless we started up this far */
73 if (gensec_krb5_state->enc_ticket.length) {
74 kerberos_free_data_contents(gensec_krb5_state->smb_krb5_context->krb5_context,
75 &gensec_krb5_state->enc_ticket);
78 if (gensec_krb5_state->ticket) {
79 krb5_free_ticket(gensec_krb5_state->smb_krb5_context->krb5_context,
80 gensec_krb5_state->ticket);
83 /* ccache freed in a child destructor */
85 krb5_free_keyblock(gensec_krb5_state->smb_krb5_context->krb5_context,
86 gensec_krb5_state->keyblock);
88 if (gensec_krb5_state->auth_context) {
89 krb5_auth_con_free(gensec_krb5_state->smb_krb5_context->krb5_context,
90 gensec_krb5_state->auth_context);
96 static NTSTATUS gensec_krb5_start(struct gensec_security *gensec_security, bool gssapi)
99 struct gensec_krb5_state *gensec_krb5_state;
100 struct cli_credentials *creds;
101 const struct tsocket_address *tlocal_addr, *tremote_addr;
102 krb5_address my_krb5_addr, peer_krb5_addr;
104 creds = gensec_get_credentials(gensec_security);
106 return NT_STATUS_INVALID_PARAMETER;
109 gensec_krb5_state = talloc(gensec_security, struct gensec_krb5_state);
110 if (!gensec_krb5_state) {
111 return NT_STATUS_NO_MEMORY;
114 gensec_security->private_data = gensec_krb5_state;
115 gensec_krb5_state->smb_krb5_context = NULL;
116 gensec_krb5_state->auth_context = NULL;
117 gensec_krb5_state->ticket = NULL;
118 ZERO_STRUCT(gensec_krb5_state->enc_ticket);
119 gensec_krb5_state->keyblock = NULL;
120 gensec_krb5_state->gssapi = gssapi;
122 talloc_set_destructor(gensec_krb5_state, gensec_krb5_destroy);
124 if (cli_credentials_get_krb5_context(creds,
125 gensec_security->settings->lp_ctx, &gensec_krb5_state->smb_krb5_context)) {
126 talloc_free(gensec_krb5_state);
127 return NT_STATUS_INTERNAL_ERROR;
130 ret = krb5_auth_con_init(gensec_krb5_state->smb_krb5_context->krb5_context, &gensec_krb5_state->auth_context);
132 DEBUG(1,("gensec_krb5_start: krb5_auth_con_init failed (%s)\n",
133 smb_get_krb5_error_message(gensec_krb5_state->smb_krb5_context->krb5_context,
134 ret, gensec_krb5_state)));
135 talloc_free(gensec_krb5_state);
136 return NT_STATUS_INTERNAL_ERROR;
139 ret = krb5_auth_con_setflags(gensec_krb5_state->smb_krb5_context->krb5_context,
140 gensec_krb5_state->auth_context,
141 KRB5_AUTH_CONTEXT_DO_SEQUENCE);
143 DEBUG(1,("gensec_krb5_start: krb5_auth_con_setflags failed (%s)\n",
144 smb_get_krb5_error_message(gensec_krb5_state->smb_krb5_context->krb5_context,
145 ret, gensec_krb5_state)));
146 talloc_free(gensec_krb5_state);
147 return NT_STATUS_INTERNAL_ERROR;
150 tlocal_addr = gensec_get_local_address(gensec_security);
153 struct sockaddr_storage ss;
155 socklen = tsocket_address_bsd_sockaddr(tlocal_addr,
156 (struct sockaddr *) &ss,
157 sizeof(struct sockaddr_storage));
159 talloc_free(gensec_krb5_state);
160 return NT_STATUS_INTERNAL_ERROR;
162 ret = krb5_sockaddr2address(gensec_krb5_state->smb_krb5_context->krb5_context,
163 (const struct sockaddr *) &ss, &my_krb5_addr);
165 DEBUG(1,("gensec_krb5_start: krb5_sockaddr2address (local) failed (%s)\n",
166 smb_get_krb5_error_message(gensec_krb5_state->smb_krb5_context->krb5_context,
167 ret, gensec_krb5_state)));
168 talloc_free(gensec_krb5_state);
169 return NT_STATUS_INTERNAL_ERROR;
173 tremote_addr = gensec_get_remote_address(gensec_security);
176 struct sockaddr_storage ss;
178 socklen = tsocket_address_bsd_sockaddr(tremote_addr,
179 (struct sockaddr *) &ss,
180 sizeof(struct sockaddr_storage));
182 talloc_free(gensec_krb5_state);
183 return NT_STATUS_INTERNAL_ERROR;
185 ret = krb5_sockaddr2address(gensec_krb5_state->smb_krb5_context->krb5_context,
186 (const struct sockaddr *) &ss, &peer_krb5_addr);
188 DEBUG(1,("gensec_krb5_start: krb5_sockaddr2address (local) failed (%s)\n",
189 smb_get_krb5_error_message(gensec_krb5_state->smb_krb5_context->krb5_context,
190 ret, gensec_krb5_state)));
191 talloc_free(gensec_krb5_state);
192 return NT_STATUS_INTERNAL_ERROR;
196 ret = krb5_auth_con_setaddrs(gensec_krb5_state->smb_krb5_context->krb5_context,
197 gensec_krb5_state->auth_context,
198 tlocal_addr ? &my_krb5_addr : NULL,
199 tremote_addr ? &peer_krb5_addr : NULL);
201 DEBUG(1,("gensec_krb5_start: krb5_auth_con_setaddrs failed (%s)\n",
202 smb_get_krb5_error_message(gensec_krb5_state->smb_krb5_context->krb5_context,
203 ret, gensec_krb5_state)));
204 talloc_free(gensec_krb5_state);
205 return NT_STATUS_INTERNAL_ERROR;
211 static NTSTATUS gensec_krb5_common_server_start(struct gensec_security *gensec_security, bool gssapi)
214 struct gensec_krb5_state *gensec_krb5_state;
216 nt_status = gensec_krb5_start(gensec_security, gssapi);
217 if (!NT_STATUS_IS_OK(nt_status)) {
221 gensec_krb5_state = (struct gensec_krb5_state *)gensec_security->private_data;
222 gensec_krb5_state->state_position = GENSEC_KRB5_SERVER_START;
227 static NTSTATUS gensec_krb5_server_start(struct gensec_security *gensec_security)
229 return gensec_krb5_common_server_start(gensec_security, false);
232 static NTSTATUS gensec_fake_gssapi_krb5_server_start(struct gensec_security *gensec_security)
234 return gensec_krb5_common_server_start(gensec_security, true);
237 static NTSTATUS gensec_krb5_common_client_start(struct gensec_security *gensec_security, bool gssapi)
239 const char *hostname;
240 struct gensec_krb5_state *gensec_krb5_state;
242 hostname = gensec_get_target_hostname(gensec_security);
244 DEBUG(3, ("No hostname for target computer passed in, cannot use kerberos for this connection\n"));
245 return NT_STATUS_INVALID_PARAMETER;
247 if (is_ipaddress(hostname)) {
248 DEBUG(2, ("Cannot do krb5 to an IP address"));
249 return NT_STATUS_INVALID_PARAMETER;
251 if (strcmp(hostname, "localhost") == 0) {
252 DEBUG(2, ("krb5 to 'localhost' does not make sense"));
253 return NT_STATUS_INVALID_PARAMETER;
256 nt_status = gensec_krb5_start(gensec_security, gssapi);
257 if (!NT_STATUS_IS_OK(nt_status)) {
261 gensec_krb5_state = (struct gensec_krb5_state *)gensec_security->private_data;
262 gensec_krb5_state->state_position = GENSEC_KRB5_CLIENT_START;
263 gensec_krb5_state->ap_req_options = AP_OPTS_USE_SUBKEY;
265 if (gensec_krb5_state->gssapi) {
266 /* The Fake GSSAPI model emulates Samba3, which does not do mutual authentication */
267 if (gensec_setting_bool(gensec_security->settings, "gensec_fake_gssapi_krb5", "mutual", false)) {
268 gensec_krb5_state->ap_req_options |= AP_OPTS_MUTUAL_REQUIRED;
271 /* The wrapping for KPASSWD (a user of the raw KRB5 API) should be mutually authenticated */
272 if (gensec_setting_bool(gensec_security->settings, "gensec_krb5", "mutual", true)) {
273 gensec_krb5_state->ap_req_options |= AP_OPTS_MUTUAL_REQUIRED;
279 static NTSTATUS gensec_krb5_common_client_creds(struct gensec_security *gensec_security,
280 struct tevent_context *ev,
283 struct gensec_krb5_state *gensec_krb5_state;
285 struct ccache_container *ccache_container;
286 const char *error_string;
287 const char *principal;
288 const char *hostname;
290 struct tevent_context *previous_ev;
292 gensec_krb5_state = (struct gensec_krb5_state *)gensec_security->private_data;
294 principal = gensec_get_target_principal(gensec_security);
295 hostname = gensec_get_target_hostname(gensec_security);
297 ret = cli_credentials_get_ccache(gensec_get_credentials(gensec_security),
299 gensec_security->settings->lp_ctx, &ccache_container, &error_string);
303 case KRB5KDC_ERR_PREAUTH_FAILED:
304 case KRB5KDC_ERR_C_PRINCIPAL_UNKNOWN:
305 return NT_STATUS_LOGON_FAILURE;
306 case KRB5_KDC_UNREACH:
307 DEBUG(3, ("Cannot reach a KDC we require to contact %s: %s\n", principal, error_string));
308 return NT_STATUS_INVALID_PARAMETER; /* Make SPNEGO ignore us, we can't go any further here */
309 case KRB5_CC_NOTFOUND:
311 DEBUG(3, ("Error preparing credentials we require to contact %s : %s\n", principal, error_string));
312 return NT_STATUS_INVALID_PARAMETER; /* Make SPNEGO ignore us, we can't go any further here */
314 DEBUG(1, ("gensec_krb5_start: Aquiring initiator credentials failed: %s\n", error_string));
315 return NT_STATUS_UNSUCCESSFUL;
319 /* Do this every time, in case we have weird recursive issues here */
320 ret = smb_krb5_context_set_event_ctx(gensec_krb5_state->smb_krb5_context, ev, &previous_ev);
322 DEBUG(1, ("gensec_krb5_start: Setting event context failed\n"));
323 return NT_STATUS_NO_MEMORY;
326 krb5_principal target_principal;
327 ret = krb5_parse_name(gensec_krb5_state->smb_krb5_context->krb5_context, principal,
330 ret = krb5_mk_req_exact(gensec_krb5_state->smb_krb5_context->krb5_context,
331 &gensec_krb5_state->auth_context,
332 gensec_krb5_state->ap_req_options,
334 &in_data, ccache_container->ccache,
335 &gensec_krb5_state->enc_ticket);
336 krb5_free_principal(gensec_krb5_state->smb_krb5_context->krb5_context,
340 ret = krb5_mk_req(gensec_krb5_state->smb_krb5_context->krb5_context,
341 &gensec_krb5_state->auth_context,
342 gensec_krb5_state->ap_req_options,
343 gensec_get_target_service(gensec_security),
345 &in_data, ccache_container->ccache,
346 &gensec_krb5_state->enc_ticket);
349 smb_krb5_context_remove_event_ctx(gensec_krb5_state->smb_krb5_context, previous_ev, ev);
354 case KRB5KDC_ERR_S_PRINCIPAL_UNKNOWN:
355 DEBUG(3, ("Server [%s] is not registered with our KDC: %s\n",
356 hostname, smb_get_krb5_error_message(gensec_krb5_state->smb_krb5_context->krb5_context, ret, gensec_krb5_state)));
357 return NT_STATUS_INVALID_PARAMETER; /* Make SPNEGO ignore us, we can't go any further here */
358 case KRB5_KDC_UNREACH:
359 DEBUG(3, ("Cannot reach a KDC we require to contact host [%s]: %s\n",
360 hostname, smb_get_krb5_error_message(gensec_krb5_state->smb_krb5_context->krb5_context, ret, gensec_krb5_state)));
361 return NT_STATUS_INVALID_PARAMETER; /* Make SPNEGO ignore us, we can't go any further here */
362 case KRB5KDC_ERR_PREAUTH_FAILED:
363 case KRB5KRB_AP_ERR_TKT_EXPIRED:
365 /* Too much clock skew - we will need to kinit to re-skew the clock */
366 case KRB5KRB_AP_ERR_SKEW:
367 case KRB5_KDCREP_SKEW:
369 DEBUG(3, ("kerberos (mk_req) failed: %s\n",
370 smb_get_krb5_error_message(gensec_krb5_state->smb_krb5_context->krb5_context, ret, gensec_krb5_state)));
374 /* just don't print a message for these really ordinary messages */
375 case KRB5_FCC_NOFILE:
376 case KRB5_CC_NOTFOUND:
379 return NT_STATUS_UNSUCCESSFUL;
383 DEBUG(0, ("kerberos: %s\n",
384 smb_get_krb5_error_message(gensec_krb5_state->smb_krb5_context->krb5_context, ret, gensec_krb5_state)));
385 return NT_STATUS_UNSUCCESSFUL;
389 static NTSTATUS gensec_krb5_client_start(struct gensec_security *gensec_security)
391 return gensec_krb5_common_client_start(gensec_security, false);
394 static NTSTATUS gensec_fake_gssapi_krb5_client_start(struct gensec_security *gensec_security)
396 return gensec_krb5_common_client_start(gensec_security, true);
401 generate a krb5 GSS-API wrapper packet given a ticket
403 static DATA_BLOB gensec_gssapi_gen_krb5_wrap(TALLOC_CTX *mem_ctx, const DATA_BLOB *ticket, const uint8_t tok_id[2])
405 struct asn1_data *data;
406 DATA_BLOB ret = data_blob_null;
408 data = asn1_init(mem_ctx);
409 if (!data || !ticket->data) {
413 if (!asn1_push_tag(data, ASN1_APPLICATION(0))) goto err;
414 if (!asn1_write_OID(data, GENSEC_OID_KERBEROS5)) goto err;
416 if (!asn1_write(data, tok_id, 2)) goto err;
417 if (!asn1_write(data, ticket->data, ticket->length)) goto err;
418 if (!asn1_pop_tag(data)) goto err;
421 ret = data_blob_talloc(mem_ctx, data->data, data->length);
428 DEBUG(1,("Failed to build krb5 wrapper at offset %d\n", (int)data->ofs));
434 parse a krb5 GSS-API wrapper packet giving a ticket
436 static bool gensec_gssapi_parse_krb5_wrap(TALLOC_CTX *mem_ctx, const DATA_BLOB *blob, DATA_BLOB *ticket, uint8_t tok_id[2])
439 struct asn1_data *data = asn1_init(mem_ctx);
446 if (!asn1_load(data, *blob)) goto err;
447 if (!asn1_start_tag(data, ASN1_APPLICATION(0))) goto err;
448 if (!asn1_check_OID(data, GENSEC_OID_KERBEROS5)) goto err;
450 data_remaining = asn1_tag_remaining(data);
452 if (data_remaining < 3) {
453 data->has_error = true;
455 if (!asn1_read(data, tok_id, 2)) goto err;
457 *ticket = data_blob_talloc(mem_ctx, NULL, data_remaining);
458 if (!asn1_read(data, ticket->data, ticket->length)) goto err;
461 if (!asn1_end_tag(data)) goto err;
463 ret = !data->has_error;
473 * Next state function for the Krb5 GENSEC mechanism
475 * @param gensec_krb5_state KRB5 State
476 * @param out_mem_ctx The TALLOC_CTX for *out to be allocated on
477 * @param in The request, as a DATA_BLOB
478 * @param out The reply, as an talloc()ed DATA_BLOB, on *out_mem_ctx
479 * @return Error, MORE_PROCESSING_REQUIRED if a reply is sent,
480 * or NT_STATUS_OK if the user is authenticated.
483 static NTSTATUS gensec_krb5_update(struct gensec_security *gensec_security,
484 TALLOC_CTX *out_mem_ctx,
485 struct tevent_context *ev,
486 const DATA_BLOB in, DATA_BLOB *out)
488 struct gensec_krb5_state *gensec_krb5_state = (struct gensec_krb5_state *)gensec_security->private_data;
489 krb5_error_code ret = 0;
492 switch (gensec_krb5_state->state_position) {
493 case GENSEC_KRB5_CLIENT_START:
495 DATA_BLOB unwrapped_out;
497 nt_status = gensec_krb5_common_client_creds(gensec_security, ev, gensec_krb5_state->gssapi);
498 if (!NT_STATUS_IS_OK(nt_status)) {
502 if (gensec_krb5_state->gssapi) {
503 unwrapped_out = data_blob_talloc(out_mem_ctx, gensec_krb5_state->enc_ticket.data, gensec_krb5_state->enc_ticket.length);
505 /* wrap that up in a nice GSS-API wrapping */
506 *out = gensec_gssapi_gen_krb5_wrap(out_mem_ctx, &unwrapped_out, TOK_ID_KRB_AP_REQ);
508 *out = data_blob_talloc(out_mem_ctx, gensec_krb5_state->enc_ticket.data, gensec_krb5_state->enc_ticket.length);
510 if (gensec_krb5_state->ap_req_options & AP_OPTS_MUTUAL_REQUIRED) {
511 gensec_krb5_state->state_position = GENSEC_KRB5_CLIENT_MUTUAL_AUTH;
512 nt_status = NT_STATUS_MORE_PROCESSING_REQUIRED;
514 gensec_krb5_state->state_position = GENSEC_KRB5_DONE;
515 nt_status = NT_STATUS_OK;
520 case GENSEC_KRB5_CLIENT_MUTUAL_AUTH:
522 DATA_BLOB unwrapped_in;
524 krb5_ap_rep_enc_part *repl = NULL;
527 if (gensec_krb5_state->gssapi) {
528 if (!gensec_gssapi_parse_krb5_wrap(out_mem_ctx, &in, &unwrapped_in, tok_id)) {
529 DEBUG(1,("gensec_gssapi_parse_krb5_wrap(mutual authentication) failed to parse\n"));
530 dump_data_pw("Mutual authentication message:\n", in.data, in.length);
531 return NT_STATUS_INVALID_PARAMETER;
536 /* TODO: check the tok_id */
538 inbuf.data = unwrapped_in.data;
539 inbuf.length = unwrapped_in.length;
540 ret = krb5_rd_rep(gensec_krb5_state->smb_krb5_context->krb5_context,
541 gensec_krb5_state->auth_context,
544 DEBUG(1,("krb5_rd_rep (mutual authentication) failed (%s)\n",
545 smb_get_krb5_error_message(gensec_krb5_state->smb_krb5_context->krb5_context, ret, out_mem_ctx)));
546 dump_data_pw("Mutual authentication message:\n", (uint8_t *)inbuf.data, inbuf.length);
547 nt_status = NT_STATUS_ACCESS_DENIED;
549 *out = data_blob(NULL, 0);
550 nt_status = NT_STATUS_OK;
551 gensec_krb5_state->state_position = GENSEC_KRB5_DONE;
554 krb5_free_ap_rep_enc_part(gensec_krb5_state->smb_krb5_context->krb5_context, repl);
559 case GENSEC_KRB5_SERVER_START:
561 DATA_BLOB unwrapped_in;
562 DATA_BLOB unwrapped_out = data_blob(NULL, 0);
563 krb5_data inbuf, outbuf;
565 struct keytab_container *keytab;
566 krb5_principal server_in_keytab;
567 const char *error_string;
568 enum credentials_obtained obtained;
571 return NT_STATUS_INVALID_PARAMETER;
574 /* Grab the keytab, however generated */
575 ret = cli_credentials_get_keytab(gensec_get_credentials(gensec_security),
576 gensec_security->settings->lp_ctx, &keytab);
578 return NT_STATUS_CANT_ACCESS_DOMAIN_INFO;
581 /* This ensures we lookup the correct entry in that
582 * keytab. A NULL principal is acceptable, and means
583 * that the krb5 libs should search the keytab at
584 * accept time for any matching key */
585 ret = principal_from_credentials(out_mem_ctx, gensec_get_credentials(gensec_security),
586 gensec_krb5_state->smb_krb5_context,
587 &server_in_keytab, &obtained, &error_string);
590 DEBUG(2,("Failed to make credentials from principal: %s\n", error_string));
591 return NT_STATUS_CANT_ACCESS_DOMAIN_INFO;
594 /* Parse the GSSAPI wrapping, if it's there... (win2k3 allows it to be omited) */
595 if (gensec_krb5_state->gssapi
596 && gensec_gssapi_parse_krb5_wrap(out_mem_ctx, &in, &unwrapped_in, tok_id)) {
597 inbuf.data = unwrapped_in.data;
598 inbuf.length = unwrapped_in.length;
600 inbuf.data = in.data;
601 inbuf.length = in.length;
604 ret = smb_rd_req_return_stuff(gensec_krb5_state->smb_krb5_context->krb5_context,
605 &gensec_krb5_state->auth_context,
606 &inbuf, keytab->keytab, server_in_keytab,
608 &gensec_krb5_state->ticket,
609 &gensec_krb5_state->keyblock);
612 return NT_STATUS_LOGON_FAILURE;
614 unwrapped_out.data = (uint8_t *)outbuf.data;
615 unwrapped_out.length = outbuf.length;
616 gensec_krb5_state->state_position = GENSEC_KRB5_DONE;
617 /* wrap that up in a nice GSS-API wrapping */
618 if (gensec_krb5_state->gssapi) {
619 *out = gensec_gssapi_gen_krb5_wrap(out_mem_ctx, &unwrapped_out, TOK_ID_KRB_AP_REP);
621 *out = data_blob_talloc(out_mem_ctx, outbuf.data, outbuf.length);
623 krb5_data_free(&outbuf);
627 case GENSEC_KRB5_DONE:
629 /* Asking too many times... */
630 return NT_STATUS_INVALID_PARAMETER;
634 static NTSTATUS gensec_krb5_session_key(struct gensec_security *gensec_security,
636 DATA_BLOB *session_key)
638 struct gensec_krb5_state *gensec_krb5_state = (struct gensec_krb5_state *)gensec_security->private_data;
639 krb5_context context = gensec_krb5_state->smb_krb5_context->krb5_context;
640 krb5_auth_context auth_context = gensec_krb5_state->auth_context;
642 krb5_error_code err = -1;
644 if (gensec_krb5_state->state_position != GENSEC_KRB5_DONE) {
645 return NT_STATUS_NO_USER_SESSION_KEY;
648 switch (gensec_security->gensec_role) {
650 err = krb5_auth_con_getlocalsubkey(context, auth_context, &skey);
653 err = krb5_auth_con_getremotesubkey(context, auth_context, &skey);
656 if (err == 0 && skey != NULL) {
657 DEBUG(10, ("Got KRB5 session key of length %d\n",
658 (int)KRB5_KEY_LENGTH(skey)));
659 *session_key = data_blob_talloc(mem_ctx,
660 KRB5_KEY_DATA(skey), KRB5_KEY_LENGTH(skey));
661 dump_data_pw("KRB5 Session Key:\n", session_key->data, session_key->length);
663 krb5_free_keyblock(context, skey);
666 DEBUG(10, ("KRB5 error getting session key %d\n", err));
667 return NT_STATUS_NO_USER_SESSION_KEY;
671 static NTSTATUS gensec_krb5_session_info(struct gensec_security *gensec_security,
673 struct auth_session_info **_session_info)
675 NTSTATUS nt_status = NT_STATUS_UNSUCCESSFUL;
676 struct gensec_krb5_state *gensec_krb5_state = (struct gensec_krb5_state *)gensec_security->private_data;
677 krb5_context context = gensec_krb5_state->smb_krb5_context->krb5_context;
678 struct auth_session_info *session_info = NULL;
680 krb5_principal client_principal;
681 char *principal_string;
683 DATA_BLOB pac_blob, *pac_blob_ptr = NULL;
688 TALLOC_CTX *tmp_ctx = talloc_new(mem_ctx);
690 return NT_STATUS_NO_MEMORY;
693 ret = krb5_ticket_get_client(context, gensec_krb5_state->ticket, &client_principal);
695 DEBUG(5, ("krb5_ticket_get_client failed to get cleint principal: %s\n",
696 smb_get_krb5_error_message(context,
698 talloc_free(tmp_ctx);
699 return NT_STATUS_NO_MEMORY;
702 ret = krb5_unparse_name(gensec_krb5_state->smb_krb5_context->krb5_context,
703 client_principal, &principal_string);
705 DEBUG(1, ("Unable to parse client principal: %s\n",
706 smb_get_krb5_error_message(context,
708 krb5_free_principal(context, client_principal);
709 talloc_free(tmp_ctx);
710 return NT_STATUS_NO_MEMORY;
713 ret = krb5_ticket_get_authorization_data_type(context, gensec_krb5_state->ticket,
714 KRB5_AUTHDATA_WIN2K_PAC,
719 DEBUG(5, ("krb5_ticket_get_authorization_data_type failed to find PAC: %s\n",
720 smb_get_krb5_error_message(context,
724 pac_blob = data_blob_talloc(tmp_ctx, pac_data.data, pac_data.length);
725 kerberos_free_data_contents(context, &pac_data);
726 if (!pac_blob.data) {
727 free(principal_string);
728 krb5_free_principal(context, client_principal);
729 talloc_free(tmp_ctx);
730 return NT_STATUS_NO_MEMORY;
733 /* decode and verify the pac */
734 nt_status = kerberos_decode_pac(gensec_krb5_state,
736 gensec_krb5_state->smb_krb5_context->krb5_context,
737 NULL, gensec_krb5_state->keyblock,
739 gensec_krb5_state->ticket->ticket.authtime, NULL);
741 if (!NT_STATUS_IS_OK(nt_status)) {
742 free(principal_string);
743 krb5_free_principal(context, client_principal);
744 talloc_free(tmp_ctx);
748 pac_blob_ptr = &pac_blob;
751 nt_status = gensec_generate_session_info_pac(tmp_ctx,
753 gensec_krb5_state->smb_krb5_context,
754 pac_blob_ptr, principal_string,
755 gensec_get_remote_address(gensec_security),
758 free(principal_string);
759 krb5_free_principal(context, client_principal);
761 if (!NT_STATUS_IS_OK(nt_status)) {
762 talloc_free(tmp_ctx);
766 nt_status = gensec_krb5_session_key(gensec_security, session_info, &session_info->session_key);
768 if (!NT_STATUS_IS_OK(nt_status)) {
769 talloc_free(tmp_ctx);
773 *_session_info = talloc_steal(mem_ctx, session_info);
775 talloc_free(tmp_ctx);
779 static NTSTATUS gensec_krb5_wrap(struct gensec_security *gensec_security,
784 struct gensec_krb5_state *gensec_krb5_state = (struct gensec_krb5_state *)gensec_security->private_data;
785 krb5_context context = gensec_krb5_state->smb_krb5_context->krb5_context;
786 krb5_auth_context auth_context = gensec_krb5_state->auth_context;
788 krb5_data input, output;
789 input.length = in->length;
790 input.data = in->data;
792 if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)) {
793 ret = krb5_mk_priv(context, auth_context, &input, &output, NULL);
795 DEBUG(1, ("krb5_mk_priv failed: %s\n",
796 smb_get_krb5_error_message(gensec_krb5_state->smb_krb5_context->krb5_context,
798 return NT_STATUS_ACCESS_DENIED;
800 *out = data_blob_talloc(mem_ctx, output.data, output.length);
802 krb5_data_free(&output);
804 return NT_STATUS_ACCESS_DENIED;
809 static NTSTATUS gensec_krb5_unwrap(struct gensec_security *gensec_security,
814 struct gensec_krb5_state *gensec_krb5_state = (struct gensec_krb5_state *)gensec_security->private_data;
815 krb5_context context = gensec_krb5_state->smb_krb5_context->krb5_context;
816 krb5_auth_context auth_context = gensec_krb5_state->auth_context;
818 krb5_data input, output;
819 krb5_replay_data replay;
820 input.length = in->length;
821 input.data = in->data;
823 if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)) {
824 ret = krb5_rd_priv(context, auth_context, &input, &output, &replay);
826 DEBUG(1, ("krb5_rd_priv failed: %s\n",
827 smb_get_krb5_error_message(gensec_krb5_state->smb_krb5_context->krb5_context,
829 return NT_STATUS_ACCESS_DENIED;
831 *out = data_blob_talloc(mem_ctx, output.data, output.length);
833 krb5_data_free(&output);
835 return NT_STATUS_ACCESS_DENIED;
840 static bool gensec_krb5_have_feature(struct gensec_security *gensec_security,
843 struct gensec_krb5_state *gensec_krb5_state = (struct gensec_krb5_state *)gensec_security->private_data;
844 if (feature & GENSEC_FEATURE_SESSION_KEY) {
847 if (!gensec_krb5_state->gssapi &&
848 (feature & GENSEC_FEATURE_SEAL)) {
855 static const char *gensec_krb5_oids[] = {
856 GENSEC_OID_KERBEROS5,
857 GENSEC_OID_KERBEROS5_OLD,
861 static const struct gensec_security_ops gensec_fake_gssapi_krb5_security_ops = {
862 .name = "fake_gssapi_krb5",
863 .auth_type = DCERPC_AUTH_TYPE_KRB5,
864 .oid = gensec_krb5_oids,
865 .client_start = gensec_fake_gssapi_krb5_client_start,
866 .server_start = gensec_fake_gssapi_krb5_server_start,
867 .update = gensec_krb5_update,
868 .magic = gensec_magic_check_krb5_oid,
869 .session_key = gensec_krb5_session_key,
870 .session_info = gensec_krb5_session_info,
871 .have_feature = gensec_krb5_have_feature,
874 .priority = GENSEC_KRB5
877 static const struct gensec_security_ops gensec_krb5_security_ops = {
879 .client_start = gensec_krb5_client_start,
880 .server_start = gensec_krb5_server_start,
881 .update = gensec_krb5_update,
882 .session_key = gensec_krb5_session_key,
883 .session_info = gensec_krb5_session_info,
884 .have_feature = gensec_krb5_have_feature,
885 .wrap = gensec_krb5_wrap,
886 .unwrap = gensec_krb5_unwrap,
889 .priority = GENSEC_KRB5
892 _PUBLIC_ NTSTATUS gensec_krb5_init(void)
896 ret = gensec_register(&gensec_krb5_security_ops);
897 if (!NT_STATUS_IS_OK(ret)) {
898 DEBUG(0,("Failed to register '%s' gensec backend!\n",
899 gensec_krb5_security_ops.name));
903 ret = gensec_register(&gensec_fake_gssapi_krb5_security_ops);
904 if (!NT_STATUS_IS_OK(ret)) {
905 DEBUG(0,("Failed to register '%s' gensec backend!\n",
906 gensec_krb5_security_ops.name));