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/tsocket/tsocket.h"
31 #include "librpc/gen_ndr/dcerpc.h"
32 #include "auth/credentials/credentials.h"
33 #include "auth/credentials/credentials_krb5.h"
34 #include "auth/kerberos/kerberos_credentials.h"
35 #include "auth/gensec/gensec.h"
36 #include "auth/gensec/gensec_internal.h"
37 #include "auth/gensec/gensec_proto.h"
38 #include "auth/gensec/gensec_toplevel_proto.h"
39 #include "param/param.h"
40 #include "auth/auth_sam_reply.h"
41 #include "lib/util/util_net.h"
42 #include "../lib/util/asn1.h"
43 #include "auth/kerberos/pac_utils.h"
44 #include "gensec_krb5.h"
46 _PUBLIC_ NTSTATUS gensec_krb5_init(void);
48 enum GENSEC_KRB5_STATE {
49 GENSEC_KRB5_SERVER_START,
50 GENSEC_KRB5_CLIENT_START,
51 GENSEC_KRB5_CLIENT_MUTUAL_AUTH,
55 struct gensec_krb5_state {
56 enum GENSEC_KRB5_STATE state_position;
57 struct smb_krb5_context *smb_krb5_context;
58 krb5_auth_context auth_context;
60 krb5_keyblock *keyblock;
63 krb5_flags ap_req_options;
66 static int gensec_krb5_destroy(struct gensec_krb5_state *gensec_krb5_state)
68 if (!gensec_krb5_state->smb_krb5_context) {
69 /* We can't clean anything else up unless we started up this far */
72 if (gensec_krb5_state->enc_ticket.length) {
73 smb_krb5_free_data_contents(gensec_krb5_state->smb_krb5_context->krb5_context,
74 &gensec_krb5_state->enc_ticket);
77 if (gensec_krb5_state->ticket) {
78 krb5_free_ticket(gensec_krb5_state->smb_krb5_context->krb5_context,
79 gensec_krb5_state->ticket);
82 /* ccache freed in a child destructor */
84 krb5_free_keyblock(gensec_krb5_state->smb_krb5_context->krb5_context,
85 gensec_krb5_state->keyblock);
87 if (gensec_krb5_state->auth_context) {
88 krb5_auth_con_free(gensec_krb5_state->smb_krb5_context->krb5_context,
89 gensec_krb5_state->auth_context);
95 static NTSTATUS gensec_krb5_start(struct gensec_security *gensec_security, bool gssapi)
98 struct gensec_krb5_state *gensec_krb5_state;
99 struct cli_credentials *creds;
100 const struct tsocket_address *tlocal_addr, *tremote_addr;
101 krb5_address my_krb5_addr, peer_krb5_addr;
103 creds = gensec_get_credentials(gensec_security);
105 return NT_STATUS_INVALID_PARAMETER;
108 gensec_krb5_state = talloc(gensec_security, struct gensec_krb5_state);
109 if (!gensec_krb5_state) {
110 return NT_STATUS_NO_MEMORY;
113 gensec_security->private_data = gensec_krb5_state;
114 gensec_krb5_state->smb_krb5_context = NULL;
115 gensec_krb5_state->auth_context = NULL;
116 gensec_krb5_state->ticket = NULL;
117 ZERO_STRUCT(gensec_krb5_state->enc_ticket);
118 gensec_krb5_state->keyblock = NULL;
119 gensec_krb5_state->gssapi = gssapi;
121 talloc_set_destructor(gensec_krb5_state, gensec_krb5_destroy);
123 if (cli_credentials_get_krb5_context(creds,
124 gensec_security->settings->lp_ctx, &gensec_krb5_state->smb_krb5_context)) {
125 talloc_free(gensec_krb5_state);
126 return NT_STATUS_INTERNAL_ERROR;
129 ret = krb5_auth_con_init(gensec_krb5_state->smb_krb5_context->krb5_context, &gensec_krb5_state->auth_context);
131 DEBUG(1,("gensec_krb5_start: krb5_auth_con_init failed (%s)\n",
132 smb_get_krb5_error_message(gensec_krb5_state->smb_krb5_context->krb5_context,
133 ret, gensec_krb5_state)));
134 talloc_free(gensec_krb5_state);
135 return NT_STATUS_INTERNAL_ERROR;
138 ret = krb5_auth_con_setflags(gensec_krb5_state->smb_krb5_context->krb5_context,
139 gensec_krb5_state->auth_context,
140 KRB5_AUTH_CONTEXT_DO_SEQUENCE);
142 DEBUG(1,("gensec_krb5_start: krb5_auth_con_setflags failed (%s)\n",
143 smb_get_krb5_error_message(gensec_krb5_state->smb_krb5_context->krb5_context,
144 ret, gensec_krb5_state)));
145 talloc_free(gensec_krb5_state);
146 return NT_STATUS_INTERNAL_ERROR;
149 tlocal_addr = gensec_get_local_address(gensec_security);
152 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 ok = smb_krb5_sockaddr_to_kaddr(&ss, &my_krb5_addr);
164 DBG_WARNING("smb_krb5_sockaddr_to_kaddr (local) failed\n");
165 talloc_free(gensec_krb5_state);
166 return NT_STATUS_INTERNAL_ERROR;
170 tremote_addr = gensec_get_remote_address(gensec_security);
173 struct sockaddr_storage ss;
176 socklen = tsocket_address_bsd_sockaddr(tremote_addr,
177 (struct sockaddr *) &ss,
178 sizeof(struct sockaddr_storage));
180 talloc_free(gensec_krb5_state);
181 return NT_STATUS_INTERNAL_ERROR;
183 ok = smb_krb5_sockaddr_to_kaddr(&ss, &peer_krb5_addr);
185 DBG_WARNING("smb_krb5_sockaddr_to_kaddr (remote) failed\n");
186 talloc_free(gensec_krb5_state);
187 return NT_STATUS_INTERNAL_ERROR;
191 ret = krb5_auth_con_setaddrs(gensec_krb5_state->smb_krb5_context->krb5_context,
192 gensec_krb5_state->auth_context,
193 tlocal_addr ? &my_krb5_addr : NULL,
194 tremote_addr ? &peer_krb5_addr : NULL);
196 DEBUG(1,("gensec_krb5_start: krb5_auth_con_setaddrs failed (%s)\n",
197 smb_get_krb5_error_message(gensec_krb5_state->smb_krb5_context->krb5_context,
198 ret, gensec_krb5_state)));
199 talloc_free(gensec_krb5_state);
200 return NT_STATUS_INTERNAL_ERROR;
206 static NTSTATUS gensec_krb5_common_server_start(struct gensec_security *gensec_security, bool gssapi)
209 struct gensec_krb5_state *gensec_krb5_state;
211 nt_status = gensec_krb5_start(gensec_security, gssapi);
212 if (!NT_STATUS_IS_OK(nt_status)) {
216 gensec_krb5_state = (struct gensec_krb5_state *)gensec_security->private_data;
217 gensec_krb5_state->state_position = GENSEC_KRB5_SERVER_START;
222 static NTSTATUS gensec_krb5_server_start(struct gensec_security *gensec_security)
224 return gensec_krb5_common_server_start(gensec_security, false);
227 static NTSTATUS gensec_fake_gssapi_krb5_server_start(struct gensec_security *gensec_security)
229 return gensec_krb5_common_server_start(gensec_security, true);
232 static NTSTATUS gensec_krb5_common_client_start(struct gensec_security *gensec_security, bool gssapi)
234 const char *hostname;
235 struct gensec_krb5_state *gensec_krb5_state;
237 hostname = gensec_get_target_hostname(gensec_security);
239 DEBUG(3, ("No hostname for target computer passed in, cannot use kerberos for this connection\n"));
240 return NT_STATUS_INVALID_PARAMETER;
242 if (is_ipaddress(hostname)) {
243 DEBUG(2, ("Cannot do krb5 to an IP address"));
244 return NT_STATUS_INVALID_PARAMETER;
246 if (strcmp(hostname, "localhost") == 0) {
247 DEBUG(2, ("krb5 to 'localhost' does not make sense"));
248 return NT_STATUS_INVALID_PARAMETER;
251 nt_status = gensec_krb5_start(gensec_security, gssapi);
252 if (!NT_STATUS_IS_OK(nt_status)) {
256 gensec_krb5_state = (struct gensec_krb5_state *)gensec_security->private_data;
257 gensec_krb5_state->state_position = GENSEC_KRB5_CLIENT_START;
258 gensec_krb5_state->ap_req_options = AP_OPTS_USE_SUBKEY;
260 if (gensec_krb5_state->gssapi) {
261 /* The Fake GSSAPI model emulates Samba3, which does not do mutual authentication */
262 if (gensec_setting_bool(gensec_security->settings, "gensec_fake_gssapi_krb5", "mutual", false)) {
263 gensec_krb5_state->ap_req_options |= AP_OPTS_MUTUAL_REQUIRED;
266 /* The wrapping for KPASSWD (a user of the raw KRB5 API) should be mutually authenticated */
267 if (gensec_setting_bool(gensec_security->settings, "gensec_krb5", "mutual", true)) {
268 gensec_krb5_state->ap_req_options |= AP_OPTS_MUTUAL_REQUIRED;
274 static NTSTATUS gensec_krb5_common_client_creds(struct gensec_security *gensec_security,
275 struct tevent_context *ev,
278 struct gensec_krb5_state *gensec_krb5_state;
280 struct ccache_container *ccache_container;
281 const char *error_string;
282 const char *principal;
283 const char *hostname;
284 krb5_data in_data = { .length = 0 };
285 krb5_data *in_data_p = NULL;
286 #ifdef SAMBA4_USES_HEIMDAL
287 struct tevent_context *previous_ev;
290 if (lpcfg_parm_bool(gensec_security->settings->lp_ctx,
291 NULL, "gensec_krb5", "send_authenticator_checksum", true)) {
292 in_data_p = &in_data;
295 gensec_krb5_state = (struct gensec_krb5_state *)gensec_security->private_data;
297 principal = gensec_get_target_principal(gensec_security);
298 hostname = gensec_get_target_hostname(gensec_security);
300 ret = cli_credentials_get_ccache(gensec_get_credentials(gensec_security),
302 gensec_security->settings->lp_ctx, &ccache_container, &error_string);
306 case KRB5KDC_ERR_PREAUTH_FAILED:
307 case KRB5KDC_ERR_C_PRINCIPAL_UNKNOWN:
308 return NT_STATUS_LOGON_FAILURE;
309 case KRB5_KDC_UNREACH:
310 DEBUG(3, ("Cannot reach a KDC we require to contact %s: %s\n", principal, error_string));
311 return NT_STATUS_INVALID_PARAMETER; /* Make SPNEGO ignore us, we can't go any further here */
312 case KRB5_CC_NOTFOUND:
314 DEBUG(3, ("Error preparing credentials we require to contact %s : %s\n", principal, error_string));
315 return NT_STATUS_INVALID_PARAMETER; /* Make SPNEGO ignore us, we can't go any further here */
317 DEBUG(1, ("gensec_krb5_start: Aquiring initiator credentials failed: %s\n", error_string));
318 return NT_STATUS_UNSUCCESSFUL;
321 #ifdef SAMBA4_USES_HEIMDAL
322 /* Do this every time, in case we have weird recursive issues here */
323 ret = smb_krb5_context_set_event_ctx(gensec_krb5_state->smb_krb5_context, ev, &previous_ev);
325 DEBUG(1, ("gensec_krb5_start: Setting event context failed\n"));
326 return NT_STATUS_NO_MEMORY;
330 krb5_principal target_principal;
331 ret = krb5_parse_name(gensec_krb5_state->smb_krb5_context->krb5_context, principal,
334 krb5_creds this_cred;
337 ZERO_STRUCT(this_cred);
338 ret = krb5_cc_get_principal(gensec_krb5_state->smb_krb5_context->krb5_context,
339 ccache_container->ccache,
342 krb5_free_principal(gensec_krb5_state->smb_krb5_context->krb5_context,
344 return NT_STATUS_UNSUCCESSFUL;
347 ret = krb5_copy_principal(gensec_krb5_state->smb_krb5_context->krb5_context,
350 krb5_free_principal(gensec_krb5_state->smb_krb5_context->krb5_context,
353 krb5_free_cred_contents(gensec_krb5_state->smb_krb5_context->krb5_context,
355 return NT_STATUS_UNSUCCESSFUL;
357 this_cred.times.endtime = 0;
359 ret = krb5_get_credentials(gensec_krb5_state->smb_krb5_context->krb5_context,
361 ccache_container->ccache,
364 krb5_free_cred_contents(gensec_krb5_state->smb_krb5_context->krb5_context,
367 return NT_STATUS_UNSUCCESSFUL;
370 ret = krb5_mk_req_extended(gensec_krb5_state->smb_krb5_context->krb5_context,
371 &gensec_krb5_state->auth_context,
372 gensec_krb5_state->ap_req_options,
375 &gensec_krb5_state->enc_ticket);
378 ret = krb5_mk_req(gensec_krb5_state->smb_krb5_context->krb5_context,
379 &gensec_krb5_state->auth_context,
380 gensec_krb5_state->ap_req_options,
381 discard_const_p(char, gensec_get_target_service(gensec_security)),
382 discard_const_p(char, hostname),
383 in_data_p, ccache_container->ccache,
384 &gensec_krb5_state->enc_ticket);
387 #ifdef SAMBA4_USES_HEIMDAL
388 smb_krb5_context_remove_event_ctx(gensec_krb5_state->smb_krb5_context, previous_ev, ev);
394 case KRB5KDC_ERR_S_PRINCIPAL_UNKNOWN:
395 DEBUG(3, ("Server [%s] is not registered with our KDC: %s\n",
396 hostname, smb_get_krb5_error_message(gensec_krb5_state->smb_krb5_context->krb5_context, ret, gensec_krb5_state)));
397 return NT_STATUS_INVALID_PARAMETER; /* Make SPNEGO ignore us, we can't go any further here */
398 case KRB5_KDC_UNREACH:
399 DEBUG(3, ("Cannot reach a KDC we require to contact host [%s]: %s\n",
400 hostname, smb_get_krb5_error_message(gensec_krb5_state->smb_krb5_context->krb5_context, ret, gensec_krb5_state)));
401 return NT_STATUS_INVALID_PARAMETER; /* Make SPNEGO ignore us, we can't go any further here */
402 case KRB5KDC_ERR_PREAUTH_FAILED:
403 case KRB5KRB_AP_ERR_TKT_EXPIRED:
405 /* Too much clock skew - we will need to kinit to re-skew the clock */
406 case KRB5KRB_AP_ERR_SKEW:
407 case KRB5_KDCREP_SKEW:
409 DEBUG(3, ("kerberos (mk_req) failed: %s\n",
410 smb_get_krb5_error_message(gensec_krb5_state->smb_krb5_context->krb5_context, ret, gensec_krb5_state)));
414 /* just don't print a message for these really ordinary messages */
415 case KRB5_FCC_NOFILE:
416 case KRB5_CC_NOTFOUND:
419 return NT_STATUS_UNSUCCESSFUL;
423 DEBUG(0, ("kerberos: %s\n",
424 smb_get_krb5_error_message(gensec_krb5_state->smb_krb5_context->krb5_context, ret, gensec_krb5_state)));
425 return NT_STATUS_UNSUCCESSFUL;
429 static NTSTATUS gensec_krb5_client_start(struct gensec_security *gensec_security)
431 return gensec_krb5_common_client_start(gensec_security, false);
434 static NTSTATUS gensec_fake_gssapi_krb5_client_start(struct gensec_security *gensec_security)
436 return gensec_krb5_common_client_start(gensec_security, true);
441 generate a krb5 GSS-API wrapper packet given a ticket
443 static DATA_BLOB gensec_gssapi_gen_krb5_wrap(TALLOC_CTX *mem_ctx, const DATA_BLOB *ticket, const uint8_t tok_id[2])
445 struct asn1_data *data;
446 DATA_BLOB ret = data_blob_null;
448 data = asn1_init(mem_ctx);
449 if (!data || !ticket->data) {
453 if (!asn1_push_tag(data, ASN1_APPLICATION(0))) goto err;
454 if (!asn1_write_OID(data, GENSEC_OID_KERBEROS5)) goto err;
456 if (!asn1_write(data, tok_id, 2)) goto err;
457 if (!asn1_write(data, ticket->data, ticket->length)) goto err;
458 if (!asn1_pop_tag(data)) goto err;
461 if (!asn1_extract_blob(data, mem_ctx, &ret)) {
470 DEBUG(1, ("Failed to build krb5 wrapper at offset %d\n",
471 (int)asn1_current_ofs(data)));
477 parse a krb5 GSS-API wrapper packet giving a ticket
479 static bool gensec_gssapi_parse_krb5_wrap(TALLOC_CTX *mem_ctx, const DATA_BLOB *blob, DATA_BLOB *ticket, uint8_t tok_id[2])
482 struct asn1_data *data = asn1_init(mem_ctx);
489 if (!asn1_load(data, *blob)) goto err;
490 if (!asn1_start_tag(data, ASN1_APPLICATION(0))) goto err;
491 if (!asn1_check_OID(data, GENSEC_OID_KERBEROS5)) goto err;
493 data_remaining = asn1_tag_remaining(data);
495 if (data_remaining < 3) {
496 asn1_set_error(data);
498 if (!asn1_read(data, tok_id, 2)) goto err;
500 *ticket = data_blob_talloc(mem_ctx, NULL, data_remaining);
501 if (!asn1_read(data, ticket->data, ticket->length)) goto err;
504 if (!asn1_end_tag(data)) goto err;
506 ret = !asn1_has_error(data);
516 * Next state function for the Krb5 GENSEC mechanism
518 * @param gensec_krb5_state KRB5 State
519 * @param out_mem_ctx The TALLOC_CTX for *out to be allocated on
520 * @param in The request, as a DATA_BLOB
521 * @param out The reply, as an talloc()ed DATA_BLOB, on *out_mem_ctx
522 * @return Error, MORE_PROCESSING_REQUIRED if a reply is sent,
523 * or NT_STATUS_OK if the user is authenticated.
526 static NTSTATUS gensec_krb5_update(struct gensec_security *gensec_security,
527 TALLOC_CTX *out_mem_ctx,
528 struct tevent_context *ev,
529 const DATA_BLOB in, DATA_BLOB *out)
531 struct gensec_krb5_state *gensec_krb5_state = (struct gensec_krb5_state *)gensec_security->private_data;
532 krb5_error_code ret = 0;
535 switch (gensec_krb5_state->state_position) {
536 case GENSEC_KRB5_CLIENT_START:
538 DATA_BLOB unwrapped_out;
540 nt_status = gensec_krb5_common_client_creds(gensec_security, ev, gensec_krb5_state->gssapi);
541 if (!NT_STATUS_IS_OK(nt_status)) {
545 if (gensec_krb5_state->gssapi) {
546 unwrapped_out = data_blob_talloc(out_mem_ctx, gensec_krb5_state->enc_ticket.data, gensec_krb5_state->enc_ticket.length);
548 /* wrap that up in a nice GSS-API wrapping */
549 *out = gensec_gssapi_gen_krb5_wrap(out_mem_ctx, &unwrapped_out, TOK_ID_KRB_AP_REQ);
551 *out = data_blob_talloc(out_mem_ctx, gensec_krb5_state->enc_ticket.data, gensec_krb5_state->enc_ticket.length);
553 if (gensec_krb5_state->ap_req_options & AP_OPTS_MUTUAL_REQUIRED) {
554 gensec_krb5_state->state_position = GENSEC_KRB5_CLIENT_MUTUAL_AUTH;
555 nt_status = NT_STATUS_MORE_PROCESSING_REQUIRED;
557 gensec_krb5_state->state_position = GENSEC_KRB5_DONE;
558 nt_status = NT_STATUS_OK;
563 case GENSEC_KRB5_CLIENT_MUTUAL_AUTH:
565 DATA_BLOB unwrapped_in;
567 krb5_ap_rep_enc_part *repl = NULL;
570 if (gensec_krb5_state->gssapi) {
571 if (!gensec_gssapi_parse_krb5_wrap(out_mem_ctx, &in, &unwrapped_in, tok_id)) {
572 DEBUG(1,("gensec_gssapi_parse_krb5_wrap(mutual authentication) failed to parse\n"));
573 dump_data_pw("Mutual authentication message:\n", in.data, in.length);
574 return NT_STATUS_INVALID_PARAMETER;
579 /* TODO: check the tok_id */
581 inbuf.data = (char *)unwrapped_in.data;
582 inbuf.length = unwrapped_in.length;
583 ret = krb5_rd_rep(gensec_krb5_state->smb_krb5_context->krb5_context,
584 gensec_krb5_state->auth_context,
587 DEBUG(1,("krb5_rd_rep (mutual authentication) failed (%s)\n",
588 smb_get_krb5_error_message(gensec_krb5_state->smb_krb5_context->krb5_context, ret, out_mem_ctx)));
589 dump_data_pw("Mutual authentication message:\n", (uint8_t *)inbuf.data, inbuf.length);
590 nt_status = NT_STATUS_ACCESS_DENIED;
592 *out = data_blob(NULL, 0);
593 nt_status = NT_STATUS_OK;
594 gensec_krb5_state->state_position = GENSEC_KRB5_DONE;
597 krb5_free_ap_rep_enc_part(gensec_krb5_state->smb_krb5_context->krb5_context, repl);
602 case GENSEC_KRB5_SERVER_START:
604 DATA_BLOB unwrapped_in;
605 DATA_BLOB unwrapped_out = data_blob(NULL, 0);
606 krb5_data inbuf, outbuf;
608 struct keytab_container *keytab;
609 krb5_principal server_in_keytab;
610 const char *error_string;
611 enum credentials_obtained obtained;
614 return NT_STATUS_INVALID_PARAMETER;
617 /* Grab the keytab, however generated */
618 ret = cli_credentials_get_keytab(gensec_get_credentials(gensec_security),
619 gensec_security->settings->lp_ctx, &keytab);
621 return NT_STATUS_CANT_ACCESS_DOMAIN_INFO;
624 /* This ensures we lookup the correct entry in that
625 * keytab. A NULL principal is acceptable, and means
626 * that the krb5 libs should search the keytab at
627 * accept time for any matching key */
628 ret = principal_from_credentials(out_mem_ctx, gensec_get_credentials(gensec_security),
629 gensec_krb5_state->smb_krb5_context,
630 &server_in_keytab, &obtained, &error_string);
633 DEBUG(2,("Failed to make credentials from principal: %s\n", error_string));
634 return NT_STATUS_CANT_ACCESS_DOMAIN_INFO;
637 if (keytab->password_based || obtained < CRED_SPECIFIED) {
639 * Use match-by-key in this case (matches
640 * cli_credentials_get_server_gss_creds()
641 * behaviour). No need to free the memory,
642 * this is handled with a talloc destructor.
644 server_in_keytab = NULL;
647 /* Parse the GSSAPI wrapping, if it's there... (win2k3 allows it to be omited) */
648 if (gensec_krb5_state->gssapi
649 && gensec_gssapi_parse_krb5_wrap(out_mem_ctx, &in, &unwrapped_in, tok_id)) {
650 inbuf.data = (char *)unwrapped_in.data;
651 inbuf.length = unwrapped_in.length;
653 inbuf.data = (char *)in.data;
654 inbuf.length = in.length;
657 ret = smb_krb5_rd_req_decoded(gensec_krb5_state->smb_krb5_context->krb5_context,
658 &gensec_krb5_state->auth_context,
663 &gensec_krb5_state->ticket,
664 &gensec_krb5_state->keyblock);
667 DBG_WARNING("smb_krb5_rd_req_decoded failed\n");
668 return NT_STATUS_LOGON_FAILURE;
670 unwrapped_out.data = (uint8_t *)outbuf.data;
671 unwrapped_out.length = outbuf.length;
672 gensec_krb5_state->state_position = GENSEC_KRB5_DONE;
673 /* wrap that up in a nice GSS-API wrapping */
674 if (gensec_krb5_state->gssapi) {
675 *out = gensec_gssapi_gen_krb5_wrap(out_mem_ctx, &unwrapped_out, TOK_ID_KRB_AP_REP);
677 *out = data_blob_talloc(out_mem_ctx, outbuf.data, outbuf.length);
679 smb_krb5_free_data_contents(gensec_krb5_state->smb_krb5_context->krb5_context,
684 case GENSEC_KRB5_DONE:
686 /* Asking too many times... */
687 return NT_STATUS_INVALID_PARAMETER;
691 static NTSTATUS gensec_krb5_session_key(struct gensec_security *gensec_security,
693 DATA_BLOB *session_key)
695 struct gensec_krb5_state *gensec_krb5_state = (struct gensec_krb5_state *)gensec_security->private_data;
696 krb5_context context = gensec_krb5_state->smb_krb5_context->krb5_context;
697 krb5_auth_context auth_context = gensec_krb5_state->auth_context;
698 krb5_error_code err = -1;
702 if (gensec_krb5_state->state_position != GENSEC_KRB5_DONE) {
703 return NT_STATUS_NO_USER_SESSION_KEY;
706 switch (gensec_security->gensec_role) {
715 ok = smb_krb5_get_smb_session_key(mem_ctx,
721 DEBUG(10, ("KRB5 error getting session key %d\n", err));
722 return NT_STATUS_NO_USER_SESSION_KEY;
728 #ifdef SAMBA4_USES_HEIMDAL
729 static NTSTATUS gensec_krb5_session_info(struct gensec_security *gensec_security,
731 struct auth_session_info **_session_info)
733 NTSTATUS nt_status = NT_STATUS_UNSUCCESSFUL;
734 struct gensec_krb5_state *gensec_krb5_state = (struct gensec_krb5_state *)gensec_security->private_data;
735 krb5_context context = gensec_krb5_state->smb_krb5_context->krb5_context;
736 struct auth_session_info *session_info = NULL;
738 krb5_principal client_principal;
739 char *principal_string = NULL;
741 DATA_BLOB pac_blob, *pac_blob_ptr = NULL;
746 TALLOC_CTX *tmp_ctx = talloc_new(mem_ctx);
748 return NT_STATUS_NO_MEMORY;
751 ret = krb5_ticket_get_client(context, gensec_krb5_state->ticket, &client_principal);
753 DEBUG(5, ("krb5_ticket_get_client failed to get client principal: %s\n",
754 smb_get_krb5_error_message(context,
756 talloc_free(tmp_ctx);
757 return NT_STATUS_NO_MEMORY;
760 ret = krb5_unparse_name(gensec_krb5_state->smb_krb5_context->krb5_context,
761 client_principal, &principal_string);
763 DEBUG(1, ("Unable to parse client principal: %s\n",
764 smb_get_krb5_error_message(context,
766 krb5_free_principal(context, client_principal);
767 talloc_free(tmp_ctx);
768 return NT_STATUS_NO_MEMORY;
771 ret = krb5_ticket_get_authorization_data_type(context, gensec_krb5_state->ticket,
772 KRB5_AUTHDATA_WIN2K_PAC,
777 DEBUG(5, ("krb5_ticket_get_authorization_data_type failed to find PAC: %s\n",
778 smb_get_krb5_error_message(context,
782 pac_blob = data_blob_talloc(tmp_ctx, pac_data.data, pac_data.length);
783 smb_krb5_free_data_contents(context, &pac_data);
784 if (!pac_blob.data) {
785 free(principal_string);
786 krb5_free_principal(context, client_principal);
787 talloc_free(tmp_ctx);
788 return NT_STATUS_NO_MEMORY;
791 /* decode and verify the pac */
792 nt_status = kerberos_decode_pac(gensec_krb5_state,
794 gensec_krb5_state->smb_krb5_context->krb5_context,
795 NULL, gensec_krb5_state->keyblock,
797 gensec_krb5_state->ticket->ticket.authtime, NULL);
799 if (!NT_STATUS_IS_OK(nt_status)) {
800 free(principal_string);
801 krb5_free_principal(context, client_principal);
802 talloc_free(tmp_ctx);
806 pac_blob_ptr = &pac_blob;
809 nt_status = gensec_generate_session_info_pac(tmp_ctx,
811 gensec_krb5_state->smb_krb5_context,
812 pac_blob_ptr, principal_string,
813 gensec_get_remote_address(gensec_security),
816 free(principal_string);
817 krb5_free_principal(context, client_principal);
819 if (!NT_STATUS_IS_OK(nt_status)) {
820 talloc_free(tmp_ctx);
824 nt_status = gensec_krb5_session_key(gensec_security, session_info, &session_info->session_key);
826 if (!NT_STATUS_IS_OK(nt_status)) {
827 talloc_free(tmp_ctx);
831 *_session_info = talloc_steal(mem_ctx, session_info);
833 talloc_free(tmp_ctx);
836 #else /* MIT KERBEROS */
837 static NTSTATUS gensec_krb5_session_info(struct gensec_security *gensec_security,
839 struct auth_session_info **psession_info)
841 NTSTATUS status = NT_STATUS_UNSUCCESSFUL;
842 struct gensec_krb5_state *gensec_krb5_state =
843 (struct gensec_krb5_state *)gensec_security->private_data;
844 krb5_context context = gensec_krb5_state->smb_krb5_context->krb5_context;
845 struct auth_session_info *session_info = NULL;
847 krb5_principal client_principal;
848 char *principal_string = NULL;
850 krb5_authdata **auth_pac_data = NULL;
851 DATA_BLOB pac_blob, *pac_blob_ptr = NULL;
853 krb5_error_code code;
857 tmp_ctx = talloc_new(mem_ctx);
858 if (tmp_ctx == NULL) {
859 return NT_STATUS_NO_MEMORY;
862 code = krb5_copy_principal(context,
863 gensec_krb5_state->ticket->enc_part2->client,
866 DBG_INFO("krb5_copy_principal failed to copy client "
868 smb_get_krb5_error_message(context, code, tmp_ctx));
869 talloc_free(tmp_ctx);
870 return NT_STATUS_NO_MEMORY;
873 code = krb5_unparse_name(context, client_principal, &principal_string);
875 DBG_WARNING("Unable to parse client principal: %s\n",
876 smb_get_krb5_error_message(context, code, tmp_ctx));
877 krb5_free_principal(context, client_principal);
878 talloc_free(tmp_ctx);
879 return NT_STATUS_NO_MEMORY;
882 code = krb5_find_authdata(context,
883 gensec_krb5_state->ticket->enc_part2->authorization_data,
885 KRB5_AUTHDATA_WIN2K_PAC,
889 DBG_INFO("krb5_find_authdata failed to find PAC: %s\n",
890 smb_get_krb5_error_message(context, code, tmp_ctx));
892 krb5_timestamp ticket_authtime =
893 gensec_krb5_state->ticket->enc_part2->times.authtime;
896 pac_blob = data_blob_talloc(tmp_ctx,
897 auth_pac_data[0]->contents,
898 auth_pac_data[0]->length);
899 krb5_free_authdata(context, auth_pac_data);
900 if (pac_blob.data == NULL) {
901 free(principal_string);
902 krb5_free_principal(context, client_principal);
903 talloc_free(tmp_ctx);
904 return NT_STATUS_NO_MEMORY;
907 /* decode and verify the pac */
908 status = kerberos_decode_pac(gensec_krb5_state,
912 gensec_krb5_state->keyblock,
917 if (!NT_STATUS_IS_OK(status)) {
918 free(principal_string);
919 krb5_free_principal(context, client_principal);
920 talloc_free(tmp_ctx);
924 pac_blob_ptr = &pac_blob;
926 krb5_free_principal(context, client_principal);
928 status = gensec_generate_session_info_pac(tmp_ctx,
930 gensec_krb5_state->smb_krb5_context,
933 gensec_get_remote_address(gensec_security),
935 SAFE_FREE(principal_string);
936 if (!NT_STATUS_IS_OK(status)) {
937 talloc_free(tmp_ctx);
941 status = gensec_krb5_session_key(gensec_security,
943 &session_info->session_key);
944 if (!NT_STATUS_IS_OK(status)) {
945 talloc_free(tmp_ctx);
949 *psession_info = talloc_steal(mem_ctx, session_info);
950 talloc_free(tmp_ctx);
954 #endif /* SAMBA4_USES_HEIMDAL */
956 static NTSTATUS gensec_krb5_wrap(struct gensec_security *gensec_security,
961 struct gensec_krb5_state *gensec_krb5_state = (struct gensec_krb5_state *)gensec_security->private_data;
962 krb5_context context = gensec_krb5_state->smb_krb5_context->krb5_context;
963 krb5_auth_context auth_context = gensec_krb5_state->auth_context;
965 krb5_data input, output;
966 input.length = in->length;
967 input.data = (char *)in->data;
969 if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)) {
970 ret = krb5_mk_priv(context, auth_context, &input, &output, NULL);
972 DEBUG(1, ("krb5_mk_priv failed: %s\n",
973 smb_get_krb5_error_message(gensec_krb5_state->smb_krb5_context->krb5_context,
975 return NT_STATUS_ACCESS_DENIED;
977 *out = data_blob_talloc(mem_ctx, output.data, output.length);
979 smb_krb5_free_data_contents(context, &output);
981 return NT_STATUS_ACCESS_DENIED;
986 static NTSTATUS gensec_krb5_unwrap(struct gensec_security *gensec_security,
991 struct gensec_krb5_state *gensec_krb5_state = (struct gensec_krb5_state *)gensec_security->private_data;
992 krb5_context context = gensec_krb5_state->smb_krb5_context->krb5_context;
993 krb5_auth_context auth_context = gensec_krb5_state->auth_context;
995 krb5_data input, output;
996 krb5_replay_data replay;
997 input.length = in->length;
998 input.data = (char *)in->data;
1000 if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)) {
1001 ret = krb5_rd_priv(context, auth_context, &input, &output, &replay);
1003 DEBUG(1, ("krb5_rd_priv failed: %s\n",
1004 smb_get_krb5_error_message(gensec_krb5_state->smb_krb5_context->krb5_context,
1006 return NT_STATUS_ACCESS_DENIED;
1008 *out = data_blob_talloc(mem_ctx, output.data, output.length);
1010 smb_krb5_free_data_contents(context, &output);
1012 return NT_STATUS_ACCESS_DENIED;
1014 return NT_STATUS_OK;
1017 static bool gensec_krb5_have_feature(struct gensec_security *gensec_security,
1020 struct gensec_krb5_state *gensec_krb5_state = (struct gensec_krb5_state *)gensec_security->private_data;
1021 if (feature & GENSEC_FEATURE_SESSION_KEY) {
1024 if (gensec_krb5_state->gssapi) {
1029 * krb5_mk_priv provides SIGN and SEAL
1031 if (feature & GENSEC_FEATURE_SIGN) {
1034 if (feature & GENSEC_FEATURE_SEAL) {
1041 static const char *gensec_krb5_final_auth_type(struct gensec_security *gensec_security)
1043 return GENSEC_FINAL_AUTH_TYPE_KRB5;
1046 static const char *gensec_krb5_oids[] = {
1047 GENSEC_OID_KERBEROS5,
1048 GENSEC_OID_KERBEROS5_OLD,
1052 static const struct gensec_security_ops gensec_fake_gssapi_krb5_security_ops = {
1053 .name = "fake_gssapi_krb5",
1054 .auth_type = DCERPC_AUTH_TYPE_KRB5,
1055 .oid = gensec_krb5_oids,
1056 .client_start = gensec_fake_gssapi_krb5_client_start,
1057 .server_start = gensec_fake_gssapi_krb5_server_start,
1058 .update = gensec_krb5_update,
1059 .magic = gensec_magic_check_krb5_oid,
1060 .session_key = gensec_krb5_session_key,
1061 .session_info = gensec_krb5_session_info,
1062 .have_feature = gensec_krb5_have_feature,
1063 .final_auth_type = gensec_krb5_final_auth_type,
1066 .priority = GENSEC_KRB5,
1069 static const struct gensec_security_ops gensec_krb5_security_ops = {
1071 .client_start = gensec_krb5_client_start,
1072 .server_start = gensec_krb5_server_start,
1073 .update = gensec_krb5_update,
1074 .session_key = gensec_krb5_session_key,
1075 .session_info = gensec_krb5_session_info,
1076 .have_feature = gensec_krb5_have_feature,
1077 .wrap = gensec_krb5_wrap,
1078 .unwrap = gensec_krb5_unwrap,
1079 .final_auth_type = gensec_krb5_final_auth_type,
1082 .priority = GENSEC_KRB5
1085 _PUBLIC_ NTSTATUS gensec_krb5_init(void)
1089 ret = gensec_register(&gensec_krb5_security_ops);
1090 if (!NT_STATUS_IS_OK(ret)) {
1091 DEBUG(0,("Failed to register '%s' gensec backend!\n",
1092 gensec_krb5_security_ops.name));
1096 ret = gensec_register(&gensec_fake_gssapi_krb5_security_ops);
1097 if (!NT_STATUS_IS_OK(ret)) {
1098 DEBUG(0,("Failed to register '%s' gensec backend!\n",
1099 gensec_fake_gssapi_krb5_security_ops.name));