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,
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;
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
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 = (char *)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 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 ||
+ 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;
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 = (char *)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;
}
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) {
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,
+ 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_replay_mutex = False;
BOOL got_auth_data = False;
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;
}
+ 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 );
+ }
+
asprintf(&host_princ_s, "%s$", global_myname());
+ if (!host_princ_s) {
+ 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;
+ if (!grab_server_mutex("replay cache mutex")) {
+ 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.
- */
+ got_replay_mutex = True;
+
+ /* 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);
- 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 ) {
+ release_server_mutex();
+ got_replay_mutex = False;
#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
+ }
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);
git.samba.org / samba.git / blobdiff