r1418: Merge Samba 3.0's recent kerberos changes into Samba4. None of this

is used yet.

Andrew Bartlett
(This used to be commit 7596f311c9a18314716f64476030ce3dfcdd98bb)

1 files changed, 213 insertions, 101 deletions

diff --git a/source4/libcli/auth/kerberos_verify.c b/source4/libcli/auth/kerberos_verify.c
index 805a3f570f..e93d3aa6e8 100644
--- a/source4/libcli/auth/kerberos_verify.c
+++ b/source4/libcli/auth/kerberos_verify.c
@@ -26,10 +26,182 @@
 
 #ifdef HAVE_KRB5
 
-/*
-  verify an incoming ticket and parse out the principal name and 
-  authorization_data if available 
-*/
+/**********************************************************************************
+ Try to verify a ticket using the system keytab... the system keytab has kvno -1 entries, so
+ it's more like what microsoft does... see comment in utils/net_ads.c in the
+ 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_error_code ret = 0;
+	BOOL auth_ok = False;
+
+	krb5_keytab keytab = NULL;
+	krb5_kt_cursor cursor;
+	krb5_keytab_entry kt_entry;
+	char *princ_name = NULL;
+
+	ZERO_STRUCT(kt_entry);
+	ZERO_STRUCT(cursor);
+
+	ret = krb5_kt_default(context, &keytab);
+	if (ret) {
+		DEBUG(1, ("ads_keytab_verify_ticket: krb5_kt_default failed (%s)\n", error_message(ret)));
+		goto out;
+	}
+
+	ret = krb5_kt_start_seq_get(context, keytab, &cursor);
+	if (ret) {
+		DEBUG(1, ("ads_keytab_verify_ticket: krb5_kt_start_seq_get failed (%s)\n", error_message(ret)));
+		goto out;
+	}
+
+	while (!krb5_kt_next_entry(context, keytab, &kt_entry, &cursor)) {
+		ret = krb5_unparse_name(context, kt_entry.principal, &princ_name);
+		if (ret) {
+			DEBUG(1, ("ads_keytab_verify_ticket: krb5_unparse_name failed (%s)\n", error_message(ret)));
+			goto out;
+		}
+		/* Look for a CIFS ticket */
+		if (!StrnCaseCmp(princ_name, "cifs/", 5)) {
+#ifdef HAVE_KRB5_KEYTAB_ENTRY_KEYBLOCK
+			krb5_auth_con_setuseruserkey(context, auth_context, &kt_entry.keyblock);
+#else
+			krb5_auth_con_setuseruserkey(context, auth_context, &kt_entry.key);
+#endif
+
+			p_packet->length = ticket->length;
+			p_packet->data = (krb5_pointer)ticket->data;
+
+			if (!(ret = krb5_rd_req(context, &auth_context, p_packet, NULL, NULL, NULL, pp_tkt))) {
+				unsigned int keytype;
+				krb5_free_unparsed_name(context, princ_name);
+				princ_name = NULL;
+#ifdef HAVE_KRB5_KEYTAB_ENTRY_KEYBLOCK
+				keytype = (unsigned int) kt_entry.keyblock.keytype;
+#else
+				keytype = (unsigned int) kt_entry.key.enctype;
+#endif
+				DEBUG(10,("ads_keytab_verify_ticket: enc type [%u] decrypted message !\n",
+					  keytype));
+				auth_ok = True;
+				break;
+			}
+		}
+		krb5_free_unparsed_name(context, princ_name);
+		princ_name = NULL;
+	}
+	if (ret && ret != KRB5_KT_END) {
+		/* This failed because something went wrong, not because the keytab file was empty. */
+		DEBUG(1, ("ads_keytab_verify_ticket: krb5_kt_next_entry failed (%s)\n", error_message(ret)));
+		goto out;
+	}
+
+  out:
+
+	if (princ_name) {
+		krb5_free_unparsed_name(context, princ_name);
+	}
+	{
+		krb5_kt_cursor zero_csr;
+		ZERO_STRUCT(zero_csr);
+		if ((memcmp(&cursor, &zero_csr, sizeof(krb5_kt_cursor)) != 0) && keytab) {
+			krb5_kt_end_seq_get(context, keytab, &cursor);
+		}
+	}
+	if (keytab) {
+		krb5_kt_close(context, keytab);
+	}
+
+	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_error_code ret = 0;
+	BOOL auth_ok = False;
+	char *password_s = NULL;
+	krb5_data password;
+	krb5_enctype *enctypes = NULL;
+	int i;
+
+	if (!secrets_init()) {
+		DEBUG(1,("ads_secrets_verify_ticket: secrets_init failed\n"));
+		return False;
+	}
+
+	password_s = secrets_fetch_machine_password(lp_workgroup());
+	if (!password_s) {
+		DEBUG(1,("ads_secrets_verify_ticket: failed to fetch machine password\n"));
+		return False;
+	}
+
+	password.data = password_s;
+	password.length = strlen(password_s);
+
+	/* CIFS doesn't use addresses in tickets. This would break NAT. JRA */
+
+	if ((ret = get_kerberos_allowed_etypes(context, &enctypes))) {
+		DEBUG(1,("ads_secrets_verify_ticket: krb5_get_permitted_enctypes failed (%s)\n", 
+			 error_message(ret)));
+		goto out;
+	}
+
+	p_packet->length = ticket->length;
+	p_packet->data = (krb5_pointer)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 = (krb5_keyblock *)malloc(sizeof(*key)))) {
+			goto out;
+		}
+	
+		if (create_kerberos_key_from_string(context, host_princ, &password, key, enctypes[i])) {
+			SAFE_FREE(key);
+			continue;
+		}
+
+		krb5_auth_con_setuseruserkey(context, auth_context, key);
+
+		krb5_free_keyblock(context, key);
+
+		if (!(ret = krb5_rd_req(context, &auth_context, p_packet, 
+					NULL,
+					NULL, NULL, pp_tkt))) {
+			DEBUG(10,("ads_secrets_verify_ticket: enc type [%u] decrypted message !\n",
+				(unsigned int)enctypes[i] ));
+			auth_ok = True;
+			break;
+		}
+	
+		DEBUG((ret != KRB5_BAD_ENCTYPE) ? 3 : 10,
+				("ads_secrets_verify_ticket: enc type [%u] failed to decrypt with error %s\n",
+				(unsigned int)enctypes[i], error_message(ret)));
+	}
+
+ out:
+
+	free_kerberos_etypes(context, enctypes);
+	SAFE_FREE(password_s);
+
+	return auth_ok;
+}
+
+/**********************************************************************************
+ Verify an incoming ticket and parse out the principal name and 
+ authorization_data if available.
+***********************************************************************************/
+
 NTSTATUS ads_verify_ticket(const char *realm, const DATA_BLOB *ticket, 
 			   char **principal, DATA_BLOB *auth_data,
 			   DATA_BLOB *ap_rep,
@@ -41,43 +213,21 @@ NTSTATUS ads_verify_ticket(const char *realm, const DATA_BLOB *ticket,
 	krb5_data packet;
 	krb5_ticket *tkt = NULL;
 	krb5_rcache rcache = NULL;
-	int ret, i;
-	krb5_keyblock *key = NULL;
+	int ret;
 
-	krb5_principal host_princ;
+	krb5_principal host_princ = NULL;
 	char *host_princ_s = NULL;
-	BOOL free_host_princ = False;
 	BOOL got_replay_mutex = False;
 
 	fstring myname;
-	char *password_s = NULL;
-	krb5_data password;
-	krb5_enctype *enctypes = NULL;
-#if 0
-	krb5_address local_addr;
-	krb5_address remote_addr;
-#endif
 	BOOL auth_ok = False;
 
 	ZERO_STRUCT(packet);
-	ZERO_STRUCT(password);
 	ZERO_STRUCTP(auth_data);
 	ZERO_STRUCTP(ap_rep);
+	ZERO_STRUCTP(session_key);
 
-	if (!secrets_init()) {
-		DEBUG(1,("ads_verify_ticket: secrets_init failed\n"));
-		return NT_STATUS_LOGON_FAILURE;
-	}
-
-	password_s = secrets_fetch_machine_password(lp_workgroup());
-	if (!password_s) {
-		DEBUG(1,("ads_verify_ticket: failed to fetch machine password\n"));
-		return NT_STATUS_LOGON_FAILURE;
-	}
-
-	password.data = password_s;
-	password.length = strlen(password_s);
-
+	initialize_krb5_error_table();
 	ret = krb5_init_context(&context);
 	if (ret) {
 		DEBUG(1,("ads_verify_ticket: krb5_init_context failed (%s)\n", error_message(ret)));
@@ -87,7 +237,6 @@ NTSTATUS ads_verify_ticket(const char *realm, const DATA_BLOB *ticket,
 	ret = krb5_set_default_realm(context, realm);
 	if (ret) {
 		DEBUG(1,("ads_verify_ticket: krb5_set_default_realm failed (%s)\n", error_message(ret)));
-		sret = NT_STATUS_LOGON_FAILURE;
 		goto out;
 	}
 
@@ -98,22 +247,29 @@ NTSTATUS ads_verify_ticket(const char *realm, const DATA_BLOB *ticket,
 	ret = krb5_auth_con_init(context, &auth_context);
 	if (ret) {
 		DEBUG(1,("ads_verify_ticket: krb5_auth_con_init failed (%s)\n", error_message(ret)));
-		sret = NT_STATUS_LOGON_FAILURE;
 		goto out;
 	}
 
-	fstrcpy(myname, global_myname());
+	name_to_fqdn(myname, global_myname());
 	strlower_m(myname);
-	asprintf(&host_princ_s, "HOST/%s@%s", myname, lp_realm());
+	asprintf(&host_princ_s, "host/%s@%s", myname, lp_realm());
 	ret = krb5_parse_name(context, host_princ_s, &host_princ);
 	if (ret) {
 		DEBUG(1,("ads_verify_ticket: krb5_parse_name(%s) failed (%s)\n",
 					host_princ_s, error_message(ret)));
-		sret = NT_STATUS_LOGON_FAILURE;
 		goto out;
 	}
 
-	free_host_princ = True;
+
+	/* 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;
 
 	/*
 	 * JRA. We must set the rcache here. This will prevent replay attacks.
@@ -122,67 +278,19 @@ NTSTATUS ads_verify_ticket(const char *realm, const DATA_BLOB *ticket,
 	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)));
-		sret = NT_STATUS_LOGON_FAILURE;
 		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)));
-		sret = NT_STATUS_LOGON_FAILURE;
 		goto out;
 	}
 
-	/* CIFS doesn't use addresses in tickets. This would breat NAT. JRA */
-
-	if ((ret = get_kerberos_allowed_etypes(context, &enctypes))) {
-		DEBUG(1,("ads_verify_ticket: krb5_get_permitted_enctypes failed (%s)\n", 
-			 error_message(ret)));
-		sret = NT_STATUS_LOGON_FAILURE;
-		goto out;
-	}
-
-	/* 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"));
-		sret = NT_STATUS_LOGON_FAILURE;
-		goto out;
-	}
-
-	got_replay_mutex = True;
-
-	/* We need to setup a auth context with each possible encoding type in turn. */
-	for (i=0;enctypes[i];i++) {
-		if (!(key = (krb5_keyblock *)malloc(sizeof(*key)))) {
-			sret = NT_STATUS_NO_MEMORY;
-			goto out;
-		}
-	
-		if (create_kerberos_key_from_string(context, host_princ, &password, key, enctypes[i])) {
-			continue;
-		}
-
-		krb5_auth_con_setuseruserkey(context, auth_context, key);
-
-		krb5_free_keyblock(context, key);
-
-		packet.length = ticket->length;
-		packet.data = (krb5_pointer)ticket->data;
-
-		if (!(ret = krb5_rd_req(context, &auth_context, &packet, 
-					NULL,
-					NULL, NULL, &tkt))) {
-			DEBUG(10,("ads_verify_ticket: enc type [%u] decrypted message !\n",
-				(unsigned int)enctypes[i] ));
-			auth_ok = True;
-			break;
-		}
-	
-		DEBUG((ret != KRB5_BAD_ENCTYPE) ? 3 : 10,
-				("ads_verify_ticket: enc type [%u] failed to decrypt with error %s\n",
-				(unsigned int)enctypes[i], error_message(ret)));
+	auth_ok = ads_keytab_verify_ticket(context, auth_context, ticket, &packet, &tkt);
+	if (!auth_ok) {
+		auth_ok = ads_secrets_verify_ticket(context, auth_context, host_princ,
+							ticket, &packet, &tkt);
 	}
 
 	release_server_mutex();
@@ -191,7 +299,6 @@ NTSTATUS ads_verify_ticket(const char *realm, const DATA_BLOB *ticket,
 	if (!auth_ok) {
 		DEBUG(3,("ads_verify_ticket: krb5_rd_req with auth failed (%s)\n", 
 			 error_message(ret)));
-		sret = NT_STATUS_LOGON_FAILURE;
 		goto out;
 	}
 
@@ -199,12 +306,12 @@ NTSTATUS ads_verify_ticket(const char *realm, const DATA_BLOB *ticket,
 	if (ret) {
 		DEBUG(3,("ads_verify_ticket: Failed to generate mutual authentication reply (%s)\n",
 			error_message(ret)));
-		sret = NT_STATUS_LOGON_FAILURE;
 		goto out;
 	}
 
 	*ap_rep = data_blob(packet.data, packet.length);
-	free(packet.data);
+	SAFE_FREE(packet.data);
+	packet.length = 0;
 
 	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);
@@ -213,7 +320,6 @@ NTSTATUS ads_verify_ticket(const char *realm, const DATA_BLOB *ticket,
 	file_save("/tmp/ticket.dat", ticket->data, ticket->length);
 #endif
 
-	/* auth_data is the PAC */
 	get_auth_data_from_tkt(auth_data, tkt);
 
 #if 0
@@ -236,29 +342,35 @@ NTSTATUS ads_verify_ticket(const char *realm, const DATA_BLOB *ticket,
 
  out:
 
-	if (got_replay_mutex)
+	if (got_replay_mutex) {
 		release_server_mutex();
+	}
 
-	if (!NT_STATUS_IS_OK(sret))
+	if (!NT_STATUS_IS_OK(sret)) {
 		data_blob_free(auth_data);
+	}
 
-	if (!NT_STATUS_IS_OK(sret))
+	if (!NT_STATUS_IS_OK(sret)) {
 		data_blob_free(ap_rep);
+	}
 
-	if (free_host_princ)
+	if (host_princ) {
 		krb5_free_principal(context, host_princ);
+	}
 
-	if (tkt != NULL)
+	if (tkt != NULL) {
 		krb5_free_ticket(context, tkt);
-	free_kerberos_etypes(context, enctypes);
-	SAFE_FREE(password_s);
+	}
+
 	SAFE_FREE(host_princ_s);
 
-	if (auth_context)
+	if (auth_context) {
 		krb5_auth_con_free(context, auth_context);
+	}
 
-	if (context)
+	if (context) {
 		krb5_free_context(context);
+	}
 
 	return sret;
 }