Copyright (C) Guenther Deschner 2003, 2005
Copyright (C) Jim McDonough (jmcd@us.ibm.com) 2003
Copyright (C) Andrew Bartlett <abartlet@samba.org> 2004-2005
+ Copyright (C) Jeremy Allison 2007
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
- the Free Software Foundation; either version 2 of the License, or
+ the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
- along with this program; if not, write to the Free Software
- Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "includes.h"
+#include "smb_krb5.h"
#ifdef HAVE_KRB5
ads_keytab_add_entry function for details.
***********************************************************************************/
-static BOOL ads_keytab_verify_ticket(krb5_context context, krb5_auth_context auth_context,
- const DATA_BLOB *ticket, krb5_data *p_packet, krb5_ticket **pp_tkt,
- krb5_keyblock **keyblock)
+static bool ads_keytab_verify_ticket(krb5_context context,
+ krb5_auth_context auth_context,
+ const DATA_BLOB *ticket,
+ krb5_ticket **pp_tkt,
+ krb5_keyblock **keyblock,
+ krb5_error_code *perr)
{
krb5_error_code ret = 0;
- BOOL auth_ok = False;
+ bool auth_ok = False;
krb5_keytab keytab = NULL;
krb5_kt_cursor kt_cursor;
krb5_keytab_entry kt_entry;
fstring my_name, my_fqdn;
int i;
int number_matched_principals = 0;
+ krb5_data packet;
+
+ *pp_tkt = NULL;
+ *keyblock = NULL;
+ *perr = 0;
/* Generate the list of principal names which we expect
* clients might want to use for authenticating to the file
my_fqdn[0] = '\0';
name_to_fqdn(my_fqdn, global_myname());
- asprintf(&valid_princ_formats[0], "%s$@%s", my_name, lp_realm());
- asprintf(&valid_princ_formats[1], "host/%s@%s", my_name, lp_realm());
- asprintf(&valid_princ_formats[2], "host/%s@%s", my_fqdn, lp_realm());
- asprintf(&valid_princ_formats[3], "host/%s.%s@%s", my_name, lp_realm(), lp_realm());
- asprintf(&valid_princ_formats[4], "cifs/%s@%s", my_name, lp_realm());
- asprintf(&valid_princ_formats[5], "cifs/%s@%s", my_fqdn, lp_realm());
- asprintf(&valid_princ_formats[6], "cifs/%s.%s@%s", my_name, lp_realm(), lp_realm());
+ if (asprintf(&valid_princ_formats[0], "%s$@%s", my_name, lp_realm()) == -1) {
+ goto out;
+ }
+ if (asprintf(&valid_princ_formats[1], "host/%s@%s", my_name, lp_realm()) == -1) {
+ goto out;
+ }
+ if (asprintf(&valid_princ_formats[2], "host/%s@%s", my_fqdn, lp_realm()) == -1) {
+ goto out;
+ }
+ if (asprintf(&valid_princ_formats[3], "host/%s.%s@%s", my_name, lp_realm(), lp_realm()) == -1) {
+ goto out;
+ }
+ if (asprintf(&valid_princ_formats[4], "cifs/%s@%s", my_name, lp_realm()) == -1) {
+ goto out;
+ }
+ if (asprintf(&valid_princ_formats[5], "cifs/%s@%s", my_fqdn, lp_realm()) == -1) {
+ goto out;
+ }
+ if (asprintf(&valid_princ_formats[6], "cifs/%s.%s@%s", my_name, lp_realm(), lp_realm()) == -1) {
+ goto out;
+ }
ZERO_STRUCT(kt_entry);
ZERO_STRUCT(kt_cursor);
- ret = krb5_kt_default(context, &keytab);
+ ret = smb_krb5_open_keytab(context, NULL, False, &keytab);
if (ret) {
- DEBUG(1, ("ads_keytab_verify_ticket: krb5_kt_default failed (%s)\n", error_message(ret)));
+ DEBUG(1, ("ads_keytab_verify_ticket: smb_krb5_open_keytab failed (%s)\n", error_message(ret)));
goto out;
}
goto out;
}
- if (ret != KRB5_KT_END && ret != ENOENT ) {
- while (!auth_ok && (krb5_kt_next_entry(context, keytab, &kt_entry, &kt_cursor) == 0)) {
- ret = smb_krb5_unparse_name(context, kt_entry.principal, &entry_princ_s);
- if (ret) {
- DEBUG(1, ("ads_keytab_verify_ticket: smb_krb5_unparse_name failed (%s)\n",
- error_message(ret)));
- goto out;
+ while (!auth_ok && (krb5_kt_next_entry(context, keytab, &kt_entry, &kt_cursor) == 0)) {
+ ret = smb_krb5_unparse_name(context, kt_entry.principal, &entry_princ_s);
+ if (ret) {
+ DEBUG(1, ("ads_keytab_verify_ticket: smb_krb5_unparse_name failed (%s)\n",
+ error_message(ret)));
+ goto out;
+ }
+
+ for (i = 0; i < ARRAY_SIZE(valid_princ_formats); i++) {
+
+ if (!strequal(entry_princ_s, valid_princ_formats[i])) {
+ continue;
}
- for (i = 0; i < sizeof(valid_princ_formats) / sizeof(valid_princ_formats[0]); i++) {
- if (strequal(entry_princ_s, valid_princ_formats[i])) {
- number_matched_principals++;
- p_packet->length = ticket->length;
- p_packet->data = (krb5_pointer)ticket->data;
- *pp_tkt = NULL;
-
- ret = krb5_rd_req_return_keyblock_from_keytab(context, &auth_context, p_packet,
- kt_entry.principal, keytab,
- NULL, pp_tkt, keyblock);
-
- if (ret) {
- DEBUG(10,("ads_keytab_verify_ticket: "
- "krb5_rd_req_return_keyblock_from_keytab(%s) failed: %s\n",
- entry_princ_s, error_message(ret)));
-
- /* workaround for MIT:
- * as krb5_ktfile_get_entry will
- * explicitly close the
- * krb5_keytab as soon as
- * krb5_rd_req has sucessfully
- * decrypted the ticket but the
- * ticket is not valid yet (due
- * to clockskew) there is no
- * point in querying more
- * keytab entries - Guenther */
-
- if (ret == KRB5KRB_AP_ERR_TKT_NYV ||
- ret == KRB5KRB_AP_ERR_TKT_EXPIRED) {
- break;
- }
- } else {
- DEBUG(3,("ads_keytab_verify_ticket: "
- "krb5_rd_req_return_keyblock_from_keytab succeeded for principal %s\n",
- entry_princ_s));
- auth_ok = True;
- break;
- }
+ number_matched_principals++;
+ packet.length = ticket->length;
+ packet.data = (char *)ticket->data;
+ *pp_tkt = NULL;
+
+ ret = krb5_rd_req_return_keyblock_from_keytab(context, &auth_context, &packet,
+ kt_entry.principal, keytab,
+ NULL, pp_tkt, keyblock);
+
+ if (ret) {
+ DEBUG(10,("ads_keytab_verify_ticket: "
+ "krb5_rd_req_return_keyblock_from_keytab(%s) failed: %s\n",
+ entry_princ_s, error_message(ret)));
+
+ /* workaround for MIT:
+ * as krb5_ktfile_get_entry will explicitly
+ * close the krb5_keytab as soon as krb5_rd_req
+ * has successfully decrypted the ticket but the
+ * ticket is not valid yet (due to clockskew)
+ * there is no point in querying more keytab
+ * entries - Guenther */
+
+ if (ret == KRB5KRB_AP_ERR_TKT_NYV ||
+ ret == KRB5KRB_AP_ERR_TKT_EXPIRED ||
+ ret == KRB5KRB_AP_ERR_SKEW) {
+ break;
}
+ } else {
+ DEBUG(3,("ads_keytab_verify_ticket: "
+ "krb5_rd_req_return_keyblock_from_keytab succeeded for principal %s\n",
+ entry_princ_s));
+ auth_ok = True;
+ break;
}
+ }
- /* Free the name we parsed. */
- SAFE_FREE(entry_princ_s);
+ /* Free the name we parsed. */
+ SAFE_FREE(entry_princ_s);
- /* Free the entry we just read. */
- smb_krb5_kt_free_entry(context, &kt_entry);
- ZERO_STRUCT(kt_entry);
- }
- krb5_kt_end_seq_get(context, keytab, &kt_cursor);
+ /* Free the entry we just read. */
+ smb_krb5_kt_free_entry(context, &kt_entry);
+ ZERO_STRUCT(kt_entry);
}
+ krb5_kt_end_seq_get(context, keytab, &kt_cursor);
ZERO_STRUCT(kt_cursor);
out:
- for (i = 0; i < sizeof(valid_princ_formats) / sizeof(valid_princ_formats[0]); i++) {
+ for (i = 0; i < ARRAY_SIZE(valid_princ_formats); i++) {
SAFE_FREE(valid_princ_formats[i]);
}
if (keytab) {
krb5_kt_close(context, keytab);
}
+ *perr = ret;
return auth_ok;
}
Try to verify a ticket using the secrets.tdb.
***********************************************************************************/
-static BOOL ads_secrets_verify_ticket(krb5_context context, krb5_auth_context auth_context,
- krb5_principal host_princ,
- const DATA_BLOB *ticket, krb5_data *p_packet, krb5_ticket **pp_tkt,
- krb5_keyblock **keyblock)
+static krb5_error_code ads_secrets_verify_ticket(krb5_context context,
+ krb5_auth_context auth_context,
+ krb5_principal host_princ,
+ const DATA_BLOB *ticket,
+ krb5_ticket **pp_tkt,
+ krb5_keyblock **keyblock,
+ krb5_error_code *perr)
{
krb5_error_code ret = 0;
- BOOL auth_ok = False;
+ bool auth_ok = False;
char *password_s = NULL;
krb5_data password;
- krb5_enctype enctypes[4] = { ENCTYPE_DES_CBC_CRC, ENCTYPE_DES_CBC_MD5, 0, 0 };
- int i;
-
+ krb5_enctype enctypes[] = {
#if defined(ENCTYPE_ARCFOUR_HMAC)
- enctypes[2] = ENCTYPE_ARCFOUR_HMAC;
+ ENCTYPE_ARCFOUR_HMAC,
#endif
+ ENCTYPE_DES_CBC_CRC,
+ ENCTYPE_DES_CBC_MD5,
+ ENCTYPE_NULL
+ };
+ krb5_data packet;
+ int i;
+
+ *pp_tkt = NULL;
+ *keyblock = NULL;
+ *perr = 0;
- ZERO_STRUCTP(keyblock);
if (!secrets_init()) {
DEBUG(1,("ads_secrets_verify_ticket: secrets_init failed\n"));
+ *perr = KRB5_CONFIG_CANTOPEN;
return False;
}
password_s = secrets_fetch_machine_password(lp_workgroup(), NULL, NULL);
if (!password_s) {
DEBUG(1,("ads_secrets_verify_ticket: failed to fetch machine password\n"));
+ *perr = KRB5_LIBOS_CANTREADPWD;
return False;
}
/* CIFS doesn't use addresses in tickets. This would break NAT. JRA */
- p_packet->length = ticket->length;
- p_packet->data = (krb5_pointer)ticket->data;
+ packet.length = ticket->length;
+ packet.data = (char *)ticket->data;
/* We need to setup a auth context with each possible encoding type in turn. */
for (i=0;enctypes[i];i++) {
krb5_keyblock *key = NULL;
if (!(key = SMB_MALLOC_P(krb5_keyblock))) {
+ ret = ENOMEM;
goto out;
}
- if (create_kerberos_key_from_string(context, host_princ, &password, key, enctypes[i])) {
+ if (create_kerberos_key_from_string(context, host_princ, &password, key, enctypes[i], false)) {
SAFE_FREE(key);
continue;
}
krb5_auth_con_setuseruserkey(context, auth_context, key);
- if (!(ret = krb5_rd_req(context, &auth_context, p_packet,
+ if (!(ret = krb5_rd_req(context, &auth_context, &packet,
NULL,
NULL, NULL, pp_tkt))) {
DEBUG(10,("ads_secrets_verify_ticket: enc type [%u] decrypted message !\n",
/* successfully decrypted but ticket is just not valid at the moment */
if (ret == KRB5KRB_AP_ERR_TKT_NYV ||
- ret == KRB5KRB_AP_ERR_TKT_EXPIRED) {
+ ret == KRB5KRB_AP_ERR_TKT_EXPIRED ||
+ ret == KRB5KRB_AP_ERR_SKEW) {
+ krb5_free_keyblock(context, key);
break;
}
out:
SAFE_FREE(password_s);
-
+ *perr = ret;
return auth_ok;
}
***********************************************************************************/
NTSTATUS ads_verify_ticket(TALLOC_CTX *mem_ctx,
- const char *realm, time_t time_offset,
- const DATA_BLOB *ticket,
- char **principal, PAC_DATA **pac_data,
+ const char *realm,
+ time_t time_offset,
+ const DATA_BLOB *ticket,
+ char **principal,
+ struct PAC_DATA **pac_data,
DATA_BLOB *ap_rep,
- DATA_BLOB *session_key)
+ DATA_BLOB *session_key,
+ bool use_replay_cache)
{
NTSTATUS sret = NT_STATUS_LOGON_FAILURE;
NTSTATUS pac_ret;
krb5_rcache rcache = NULL;
krb5_keyblock *keyblock = NULL;
time_t authtime;
- int ret;
-
+ krb5_error_code ret = 0;
+ int flags = 0;
krb5_principal host_princ = NULL;
krb5_const_principal client_principal = NULL;
char *host_princ_s = NULL;
- BOOL got_replay_mutex = False;
-
- BOOL auth_ok = False;
- BOOL got_auth_data = False;
+ bool auth_ok = False;
+ bool got_auth_data = False;
+ struct named_mutex *mutex = NULL;
ZERO_STRUCT(packet);
ZERO_STRUCT(auth_data);
- ZERO_STRUCTP(ap_rep);
- ZERO_STRUCTP(session_key);
+
+ *principal = NULL;
+ *pac_data = NULL;
+ *ap_rep = data_blob_null;
+ *session_key = data_blob_null;
initialize_krb5_error_table();
ret = krb5_init_context(&context);
goto out;
}
- asprintf(&host_princ_s, "%s$", global_myname());
+ krb5_auth_con_getflags( context, auth_context, &flags );
+ if ( !use_replay_cache ) {
+ /* Disable default use of a replay cache */
+ flags &= ~KRB5_AUTH_CONTEXT_DO_TIME;
+ krb5_auth_con_setflags( context, auth_context, flags );
+ }
+
+ if (asprintf(&host_princ_s, "%s$", global_myname()) == -1) {
+ goto out;
+ }
+
strlower_m(host_princ_s);
ret = smb_krb5_parse_name(context, host_princ_s, &host_princ);
if (ret) {
}
- /* Lock a mutex surrounding the replay as there is no locking in the MIT krb5
- * code surrounding the replay cache... */
+ if ( use_replay_cache ) {
+
+ /* Lock a mutex surrounding the replay as there is no
+ locking in the MIT krb5 code surrounding the replay
+ cache... */
- if (!grab_server_mutex("replay cache mutex")) {
- DEBUG(1,("ads_verify_ticket: unable to protect replay cache with mutex.\n"));
- goto out;
- }
-
- got_replay_mutex = True;
+ mutex = grab_named_mutex(talloc_tos(), "replay cache mutex",
+ 10);
+ if (mutex == NULL) {
+ DEBUG(1,("ads_verify_ticket: unable to protect "
+ "replay cache with mutex.\n"));
+ ret = KRB5_CC_IO;
+ goto out;
+ }
- /*
- * JRA. We must set the rcache here. This will prevent replay attacks.
- */
+ /* JRA. We must set the rcache here. This will prevent
+ replay attacks. */
+
+ ret = krb5_get_server_rcache(context,
+ krb5_princ_component(context, host_princ, 0),
+ &rcache);
+ if (ret) {
+ DEBUG(1,("ads_verify_ticket: krb5_get_server_rcache "
+ "failed (%s)\n", error_message(ret)));
+ goto out;
+ }
- ret = krb5_get_server_rcache(context, krb5_princ_component(context, host_princ, 0), &rcache);
- if (ret) {
- DEBUG(1,("ads_verify_ticket: krb5_get_server_rcache failed (%s)\n", error_message(ret)));
- goto out;
+ ret = krb5_auth_con_setrcache(context, auth_context, rcache);
+ if (ret) {
+ DEBUG(1,("ads_verify_ticket: krb5_auth_con_setrcache "
+ "failed (%s)\n", error_message(ret)));
+ goto out;
+ }
}
- ret = krb5_auth_con_setrcache(context, auth_context, rcache);
- if (ret) {
- DEBUG(1,("ads_verify_ticket: krb5_auth_con_setrcache failed (%s)\n", error_message(ret)));
- goto out;
- }
+ /* Try secrets.tdb first and fallback to the krb5.keytab if
+ necessary */
- if (lp_use_kerberos_keytab()) {
- auth_ok = ads_keytab_verify_ticket(context, auth_context, ticket, &packet, &tkt, &keyblock);
- }
- if (!auth_ok) {
- auth_ok = ads_secrets_verify_ticket(context, auth_context, host_princ,
- ticket, &packet, &tkt, &keyblock);
+ auth_ok = ads_secrets_verify_ticket(context, auth_context, host_princ,
+ ticket, &tkt, &keyblock, &ret);
+
+ if (!auth_ok &&
+ (ret == KRB5KRB_AP_ERR_TKT_NYV ||
+ ret == KRB5KRB_AP_ERR_TKT_EXPIRED ||
+ ret == KRB5KRB_AP_ERR_SKEW)) {
+ goto auth_failed;
}
- release_server_mutex();
- got_replay_mutex = False;
+ if (!auth_ok && lp_use_kerberos_keytab()) {
+ auth_ok = ads_keytab_verify_ticket(context, auth_context,
+ ticket, &tkt, &keyblock, &ret);
+ }
+ if ( use_replay_cache ) {
+ TALLOC_FREE(mutex);
#if 0
- /* Heimdal leaks here, if we fix the leak, MIT crashes */
- if (rcache) {
- krb5_rc_close(context, rcache);
- }
+ /* Heimdal leaks here, if we fix the leak, MIT crashes */
+ if (rcache) {
+ krb5_rc_close(context, rcache);
+ }
#endif
+ }
+ auth_failed:
if (!auth_ok) {
DEBUG(3,("ads_verify_ticket: krb5_rd_req with auth failed (%s)\n",
error_message(ret)));
+ /* Try map the error return in case it's something like
+ * a clock skew error.
+ */
+ sret = krb5_to_nt_status(ret);
+ if (NT_STATUS_IS_OK(sret) || NT_STATUS_EQUAL(sret,NT_STATUS_UNSUCCESSFUL)) {
+ sret = NT_STATUS_LOGON_FAILURE;
+ }
+ DEBUG(10,("ads_verify_ticket: returning error %s\n",
+ nt_errstr(sret) ));
goto out;
}
}
*ap_rep = data_blob(packet.data, packet.length);
- SAFE_FREE(packet.data);
- packet.length = 0;
+ if (packet.data) {
+ kerberos_free_data_contents(context, &packet);
+ ZERO_STRUCT(packet);
+ }
get_krb5_smb_session_key(context, auth_context, session_key, True);
dump_data_pw("SMB session key (from ticket)\n", session_key->data, session_key->length);
DEBUG(3,("ads_verify_ticket: did not retrieve auth data. continuing without PAC\n"));
}
- if (got_auth_data && pac_data != NULL) {
-
+ if (got_auth_data) {
pac_ret = decode_pac_data(mem_ctx, &auth_data, context, keyblock, client_principal, authtime, pac_data);
if (!NT_STATUS_IS_OK(pac_ret)) {
DEBUG(3,("ads_verify_ticket: failed to decode PAC_DATA: %s\n", nt_errstr(pac_ret)));
out:
- if (got_replay_mutex) {
- release_server_mutex();
- }
+ TALLOC_FREE(mutex);
if (!NT_STATUS_IS_OK(sret)) {
data_blob_free(&auth_data);
git.samba.org / samba.git / blobdiff