r6113: Move GENSEC and the kerberos code out of libcli/auth, and into

auth/gensec and auth/kerberos.

This also pulls the kerberos configure code out of libads (which is
otherwise dead), and into auth/kerberos/kerberos.m4

Andrew Bartlett
(This used to be commit e074d63f3dcf4f84239a10879112ebaf1cfa6c4f)

1 files changed, 514 insertions, 0 deletions

diff --git a/source4/auth/gensec/gensec_ntlmssp.c b/source4/auth/gensec/gensec_ntlmssp.c
new file mode 100644
index 0000000000..5955904886
--- /dev/null
+++ b/source4/auth/gensec/gensec_ntlmssp.c
@@ -0,0 +1,514 @@
+/* 
+   Unix SMB/CIFS implementation.
+
+   dcerpc authentication operations
+
+   Copyright (C) Andrew Tridgell 2003
+   Copyright (C) Andrew Bartlett <abartlet@samba.org> 2004
+   Copyright (C) Stefan Metzmacher 2005
+   
+   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
+   (at your option) any later version.
+   
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   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.
+*/
+
+#include "includes.h"
+#include "auth/auth.h"
+
+struct gensec_ntlmssp_state {
+	struct auth_context *auth_context;
+	struct auth_serversupplied_info *server_info;
+	struct ntlmssp_state *ntlmssp_state;
+	uint32_t have_features;
+};
+
+
+/**
+ * Return the challenge as determined by the authentication subsystem 
+ * @return an 8 byte random challenge
+ */
+
+static const uint8_t *auth_ntlmssp_get_challenge(const struct ntlmssp_state *ntlmssp_state)
+{
+	struct gensec_ntlmssp_state *gensec_ntlmssp_state = ntlmssp_state->auth_context;
+	NTSTATUS status;
+	const uint8_t *chal;
+
+	status = auth_get_challenge(gensec_ntlmssp_state->auth_context, &chal);
+	if (!NT_STATUS_IS_OK(status)) {
+		return NULL;
+	}
+
+	return chal;
+}
+
+/**
+ * Some authentication methods 'fix' the challenge, so we may not be able to set it
+ *
+ * @return If the effective challenge used by the auth subsystem may be modified
+ */
+static BOOL auth_ntlmssp_may_set_challenge(const struct ntlmssp_state *ntlmssp_state)
+{
+	struct gensec_ntlmssp_state *gensec_ntlmssp_state = ntlmssp_state->auth_context;
+
+	return auth_challenge_may_be_modified(gensec_ntlmssp_state->auth_context);
+}
+
+/**
+ * NTLM2 authentication modifies the effective challenge, 
+ * @param challenge The new challenge value
+ */
+static NTSTATUS auth_ntlmssp_set_challenge(struct ntlmssp_state *ntlmssp_state, DATA_BLOB *challenge)
+{
+	NTSTATUS nt_status;
+	struct gensec_ntlmssp_state *gensec_ntlmssp_state = ntlmssp_state->auth_context;
+	struct auth_context *auth_context = gensec_ntlmssp_state->auth_context;
+	const uint8_t *chal;
+
+	if (challenge->length != 8) {
+		return NT_STATUS_INVALID_PARAMETER;
+	}
+
+	chal = challenge->data;
+
+	nt_status = auth_context_set_challenge(auth_context, chal, "NTLMSSP callback (NTLM2)");
+
+	return nt_status;
+}
+
+/**
+ * Check the password on an NTLMSSP login.  
+ *
+ * Return the session keys used on the connection.
+ */
+
+static NTSTATUS auth_ntlmssp_check_password(struct ntlmssp_state *ntlmssp_state, DATA_BLOB *user_session_key, DATA_BLOB *lm_session_key) 
+{
+	struct gensec_ntlmssp_state *gensec_ntlmssp_state = ntlmssp_state->auth_context;
+	struct auth_usersupplied_info *user_info = NULL;
+	NTSTATUS nt_status;
+
+	nt_status = make_user_info_map(ntlmssp_state, 
+				       gensec_ntlmssp_state->ntlmssp_state->user, 
+				       gensec_ntlmssp_state->ntlmssp_state->domain, 
+				       gensec_ntlmssp_state->ntlmssp_state->workstation, 
+	                               gensec_ntlmssp_state->ntlmssp_state->lm_resp.data ? &gensec_ntlmssp_state->ntlmssp_state->lm_resp : NULL, 
+	                               gensec_ntlmssp_state->ntlmssp_state->nt_resp.data ? &gensec_ntlmssp_state->ntlmssp_state->nt_resp : NULL, 
+				       NULL, NULL, NULL, True,
+				       &user_info);
+	NT_STATUS_NOT_OK_RETURN(nt_status);
+
+	nt_status = auth_check_password(gensec_ntlmssp_state->auth_context, gensec_ntlmssp_state,
+					user_info, &gensec_ntlmssp_state->server_info);
+	talloc_free(user_info);
+	NT_STATUS_NOT_OK_RETURN(nt_status);
+
+	if (gensec_ntlmssp_state->server_info->user_session_key.length) {
+		DEBUG(10, ("Got NT session key of length %u\n", gensec_ntlmssp_state->server_info->user_session_key.length));
+		*user_session_key = data_blob_talloc(ntlmssp_state, 
+						   gensec_ntlmssp_state->server_info->user_session_key.data,
+						   gensec_ntlmssp_state->server_info->user_session_key.length);
+	}
+	if (gensec_ntlmssp_state->server_info->lm_session_key.length) {
+		DEBUG(10, ("Got LM session key of length %u\n", gensec_ntlmssp_state->server_info->lm_session_key.length));
+		*lm_session_key = data_blob_talloc(ntlmssp_state, 
+						   gensec_ntlmssp_state->server_info->lm_session_key.data,
+						   gensec_ntlmssp_state->server_info->lm_session_key.length);
+	}
+	return nt_status;
+}
+
+static int gensec_ntlmssp_destroy(void *ptr)
+{
+	struct gensec_ntlmssp_state *gensec_ntlmssp_state = ptr;
+
+	if (gensec_ntlmssp_state->ntlmssp_state) {
+		ntlmssp_end(&gensec_ntlmssp_state->ntlmssp_state);
+	}
+
+	return 0;
+}
+
+static NTSTATUS gensec_ntlmssp_start(struct gensec_security *gensec_security)
+{
+	struct gensec_ntlmssp_state *gensec_ntlmssp_state;
+	
+	gensec_ntlmssp_state = talloc(gensec_security, struct gensec_ntlmssp_state);
+	if (!gensec_ntlmssp_state) {
+		return NT_STATUS_NO_MEMORY;
+	}
+
+	gensec_ntlmssp_state->ntlmssp_state = NULL;
+	gensec_ntlmssp_state->auth_context = NULL;
+	gensec_ntlmssp_state->server_info = NULL;
+	gensec_ntlmssp_state->have_features = 0;
+
+	talloc_set_destructor(gensec_ntlmssp_state, gensec_ntlmssp_destroy); 
+
+	gensec_security->private_data = gensec_ntlmssp_state;
+	return NT_STATUS_OK;
+}
+
+static NTSTATUS gensec_ntlmssp_server_start(struct gensec_security *gensec_security)
+{
+	NTSTATUS nt_status;
+	struct ntlmssp_state *ntlmssp_state;
+	struct gensec_ntlmssp_state *gensec_ntlmssp_state;
+
+	nt_status = gensec_ntlmssp_start(gensec_security);
+	NT_STATUS_NOT_OK_RETURN(nt_status);
+
+	gensec_ntlmssp_state = gensec_security->private_data;
+
+	nt_status = ntlmssp_server_start(gensec_ntlmssp_state, &gensec_ntlmssp_state->ntlmssp_state);
+	NT_STATUS_NOT_OK_RETURN(nt_status);
+
+	if (gensec_security->want_features & GENSEC_FEATURE_SIGN) {
+		gensec_ntlmssp_state->ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_SIGN;
+	}
+	if (gensec_security->want_features & GENSEC_FEATURE_SEAL) {
+		gensec_ntlmssp_state->ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_SEAL;
+	}
+
+	nt_status = auth_context_create(gensec_ntlmssp_state, lp_auth_methods(), &gensec_ntlmssp_state->auth_context);
+	NT_STATUS_NOT_OK_RETURN(nt_status);
+
+	ntlmssp_state = gensec_ntlmssp_state->ntlmssp_state;
+	ntlmssp_state->auth_context = gensec_ntlmssp_state;
+	ntlmssp_state->get_challenge = auth_ntlmssp_get_challenge;
+	ntlmssp_state->may_set_challenge = auth_ntlmssp_may_set_challenge;
+	ntlmssp_state->set_challenge = auth_ntlmssp_set_challenge;
+	ntlmssp_state->check_password = auth_ntlmssp_check_password;
+	ntlmssp_state->server_role = lp_server_role();
+
+	return NT_STATUS_OK;
+}
+
+static NTSTATUS gensec_ntlmssp_client_start(struct gensec_security *gensec_security)
+{
+	struct gensec_ntlmssp_state *gensec_ntlmssp_state;
+	const char *password = NULL;
+	NTSTATUS nt_status;
+
+	nt_status = gensec_ntlmssp_start(gensec_security);
+	NT_STATUS_NOT_OK_RETURN(nt_status);
+
+	gensec_ntlmssp_state = gensec_security->private_data;
+	nt_status = ntlmssp_client_start(gensec_ntlmssp_state,
+					 &gensec_ntlmssp_state->ntlmssp_state);
+	NT_STATUS_NOT_OK_RETURN(nt_status);
+
+	if (gensec_security->want_features & GENSEC_FEATURE_SESSION_KEY) {
+		/*
+		 * We need to set this to allow a later SetPassword
+		 * via the SAMR pipe to succeed. Strange.... We could
+		 * also add  NTLMSSP_NEGOTIATE_SEAL here. JRA.
+		 * 
+		 * Without this, Windows will not create the master key
+		 * that it thinks is only used for NTLMSSP signing and 
+		 * sealing.  (It is actually pulled out and used directly) 
+		 */
+		gensec_ntlmssp_state->ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_SIGN;
+	}
+	if (gensec_security->want_features & GENSEC_FEATURE_SIGN) {
+		gensec_ntlmssp_state->ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_SIGN;
+	}
+	if (gensec_security->want_features & GENSEC_FEATURE_SEAL) {
+		gensec_ntlmssp_state->ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_SEAL;
+	}
+
+	nt_status = ntlmssp_set_domain(gensec_ntlmssp_state->ntlmssp_state, 
+				       cli_credentials_get_domain(gensec_security->credentials));
+	NT_STATUS_NOT_OK_RETURN(nt_status);
+	
+	nt_status = ntlmssp_set_username(gensec_ntlmssp_state->ntlmssp_state, 
+					 cli_credentials_get_username(gensec_security->credentials));
+	NT_STATUS_NOT_OK_RETURN(nt_status);
+
+	password = cli_credentials_get_password(gensec_security->credentials);
+
+	nt_status = ntlmssp_set_password(gensec_ntlmssp_state->ntlmssp_state, password);
+	NT_STATUS_NOT_OK_RETURN(nt_status);
+
+	nt_status = ntlmssp_set_workstation(gensec_ntlmssp_state->ntlmssp_state,
+					    cli_credentials_get_workstation(gensec_security->credentials));
+
+	gensec_security->private_data = gensec_ntlmssp_state;
+
+	return NT_STATUS_OK;
+}
+
+/*
+  wrappers for the ntlmssp_*() functions
+*/
+static NTSTATUS gensec_ntlmssp_unseal_packet(struct gensec_security *gensec_security, 
+					     TALLOC_CTX *mem_ctx, 
+					     uint8_t *data, size_t length, 
+					     const uint8_t *whole_pdu, size_t pdu_length, 
+					     DATA_BLOB *sig)
+{
+	struct gensec_ntlmssp_state *gensec_ntlmssp_state = gensec_security->private_data;
+
+	return ntlmssp_unseal_packet(gensec_ntlmssp_state->ntlmssp_state, mem_ctx, data, length, whole_pdu, pdu_length, sig);
+}
+
+static NTSTATUS gensec_ntlmssp_check_packet(struct gensec_security *gensec_security, 
+					    TALLOC_CTX *mem_ctx, 
+					    const uint8_t *data, size_t length, 
+					    const uint8_t *whole_pdu, size_t pdu_length, 
+					    const DATA_BLOB *sig)
+{
+	struct gensec_ntlmssp_state *gensec_ntlmssp_state = gensec_security->private_data;
+
+	return ntlmssp_check_packet(gensec_ntlmssp_state->ntlmssp_state, mem_ctx, data, length, whole_pdu, pdu_length, sig);
+}
+
+static NTSTATUS gensec_ntlmssp_seal_packet(struct gensec_security *gensec_security, 
+					   TALLOC_CTX *mem_ctx, 
+					   uint8_t *data, size_t length, 
+					   const uint8_t *whole_pdu, size_t pdu_length, 
+					   DATA_BLOB *sig)
+{
+	struct gensec_ntlmssp_state *gensec_ntlmssp_state = gensec_security->private_data;
+
+	return ntlmssp_seal_packet(gensec_ntlmssp_state->ntlmssp_state, mem_ctx, data, length, whole_pdu, pdu_length, sig);
+}
+
+static NTSTATUS gensec_ntlmssp_sign_packet(struct gensec_security *gensec_security, 
+					   TALLOC_CTX *mem_ctx, 
+					   const uint8_t *data, size_t length, 
+					   const uint8_t *whole_pdu, size_t pdu_length, 
+					   DATA_BLOB *sig)
+{
+	struct gensec_ntlmssp_state *gensec_ntlmssp_state = gensec_security->private_data;
+
+	return ntlmssp_sign_packet(gensec_ntlmssp_state->ntlmssp_state, mem_ctx, data, length, whole_pdu, pdu_length, sig);
+}
+
+static size_t gensec_ntlmssp_sig_size(struct gensec_security *gensec_security) 
+{
+	return NTLMSSP_SIG_SIZE;
+}
+
+static NTSTATUS gensec_ntlmssp_wrap(struct gensec_security *gensec_security, 
+				    TALLOC_CTX *mem_ctx, 
+				    const DATA_BLOB *in, 
+				    DATA_BLOB *out)
+{
+	struct gensec_ntlmssp_state *gensec_ntlmssp_state = gensec_security->private_data;
+	DATA_BLOB sig;
+	NTSTATUS nt_status;
+
+	if (gensec_ntlmssp_state->ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_SEAL) {
+
+		*out = data_blob_talloc(mem_ctx, NULL, in->length + NTLMSSP_SIG_SIZE);
+		memcpy(out->data + NTLMSSP_SIG_SIZE, in->data, in->length);
+
+	        nt_status = ntlmssp_seal_packet(gensec_ntlmssp_state->ntlmssp_state, mem_ctx, 
+						out->data + NTLMSSP_SIG_SIZE, 
+						out->length - NTLMSSP_SIG_SIZE, 
+						out->data + NTLMSSP_SIG_SIZE, 
+						out->length - NTLMSSP_SIG_SIZE, 
+						&sig);
+
+		if (NT_STATUS_IS_OK(nt_status)) {
+			memcpy(out->data, sig.data, NTLMSSP_SIG_SIZE);
+		}
+		return nt_status;
+
+	} else if ((gensec_ntlmssp_state->ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_SIGN) 
+		   || (gensec_ntlmssp_state->ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_ALWAYS_SIGN)) {
+
+		*out = data_blob_talloc(mem_ctx, NULL, in->length + NTLMSSP_SIG_SIZE);
+		memcpy(out->data + NTLMSSP_SIG_SIZE, in->data, in->length);
+
+	        nt_status = ntlmssp_sign_packet(gensec_ntlmssp_state->ntlmssp_state, mem_ctx, 
+						out->data + NTLMSSP_SIG_SIZE, 
+						out->length - NTLMSSP_SIG_SIZE, 
+						out->data + NTLMSSP_SIG_SIZE, 
+						out->length - NTLMSSP_SIG_SIZE, 
+						&sig);
+
+		if (NT_STATUS_IS_OK(nt_status)) {
+			memcpy(out->data, sig.data, NTLMSSP_SIG_SIZE);
+		}
+		return nt_status;
+
+	} else {
+		*out = *in;
+		return NT_STATUS_OK;
+	}
+}
+
+
+static NTSTATUS gensec_ntlmssp_unwrap(struct gensec_security *gensec_security, 
+				      TALLOC_CTX *mem_ctx, 
+				      const DATA_BLOB *in, 
+				      DATA_BLOB *out)
+{
+	struct gensec_ntlmssp_state *gensec_ntlmssp_state = gensec_security->private_data;
+	DATA_BLOB sig;
+
+	if (gensec_ntlmssp_state->ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_SEAL) {
+		if (in->length < NTLMSSP_SIG_SIZE) {
+			return NT_STATUS_INVALID_PARAMETER;
+		}
+		sig.data = in->data;
+		sig.length = NTLMSSP_SIG_SIZE;
+
+		*out = data_blob_talloc(mem_ctx, in->data + NTLMSSP_SIG_SIZE, in->length - NTLMSSP_SIG_SIZE);
+		
+	        return ntlmssp_unseal_packet(gensec_ntlmssp_state->ntlmssp_state, mem_ctx, 
+					     out->data, out->length, 
+					     out->data, out->length, 
+					     &sig);
+						  
+	} else if ((gensec_ntlmssp_state->ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_SIGN) 
+		   || (gensec_ntlmssp_state->ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_ALWAYS_SIGN)) {
+		if (in->length < NTLMSSP_SIG_SIZE) {
+			return NT_STATUS_INVALID_PARAMETER;
+		}
+		sig.data = in->data;
+		sig.length = NTLMSSP_SIG_SIZE;
+
+		*out = data_blob_talloc(mem_ctx, in->data + NTLMSSP_SIG_SIZE, in->length - NTLMSSP_SIG_SIZE);
+		
+	        return ntlmssp_check_packet(gensec_ntlmssp_state->ntlmssp_state, mem_ctx, 
+					    out->data, out->length, 
+					    out->data, out->length, 
+					    &sig);
+	} else {
+		*out = *in;
+		return NT_STATUS_OK;
+	}
+}
+
+static NTSTATUS gensec_ntlmssp_session_key(struct gensec_security *gensec_security, 
+					   DATA_BLOB *session_key)
+{
+	struct gensec_ntlmssp_state *gensec_ntlmssp_state = gensec_security->private_data;
+
+	return ntlmssp_session_key(gensec_ntlmssp_state->ntlmssp_state, session_key);
+}
+
+/**
+ * Next state function for the wrapped NTLMSSP state machine
+ * 
+ * @param gensec_security GENSEC state, initialised to NTLMSSP
+ * @param out_mem_ctx The TALLOC_CTX for *out to be allocated on
+ * @param in The request, as a DATA_BLOB
+ * @param out The reply, as an talloc()ed DATA_BLOB, on *out_mem_ctx
+ * @return Error, MORE_PROCESSING_REQUIRED if a reply is sent, 
+ *                or NT_STATUS_OK if the user is authenticated. 
+ */
+
+static NTSTATUS gensec_ntlmssp_update(struct gensec_security *gensec_security, TALLOC_CTX *out_mem_ctx, 
+				      const DATA_BLOB in, DATA_BLOB *out) 
+{
+	struct gensec_ntlmssp_state *gensec_ntlmssp_state = gensec_security->private_data;
+	NTSTATUS status;
+
+	status = ntlmssp_update(gensec_ntlmssp_state->ntlmssp_state, out_mem_ctx, in, out);
+
+	if (!NT_STATUS_EQUAL(status, NT_STATUS_MORE_PROCESSING_REQUIRED) && !NT_STATUS_IS_OK(status)) {
+		return status;
+	}
+	
+	gensec_ntlmssp_state->have_features = 0;
+
+	if (gensec_ntlmssp_state->ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_SIGN) {
+		gensec_ntlmssp_state->have_features |= GENSEC_FEATURE_SIGN;
+	}
+
+	if (gensec_ntlmssp_state->ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_SEAL) {
+		gensec_ntlmssp_state->have_features |= GENSEC_FEATURE_SEAL;
+	}
+
+	if (gensec_ntlmssp_state->ntlmssp_state->session_key.data) {
+		gensec_ntlmssp_state->have_features |= GENSEC_FEATURE_SESSION_KEY;
+	}
+
+	return status;
+}
+
+/** 
+ * Return the credentials of a logged on user, including session keys
+ * etc.
+ *
+ * Only valid after a successful authentication
+ *
+ * May only be called once per authentication.
+ *
+ */
+
+static NTSTATUS gensec_ntlmssp_session_info(struct gensec_security *gensec_security,
+					    struct auth_session_info **session_info) 
+{
+	NTSTATUS nt_status;
+	struct gensec_ntlmssp_state *gensec_ntlmssp_state = gensec_security->private_data;
+
+	nt_status = auth_generate_session_info(gensec_ntlmssp_state, gensec_ntlmssp_state->server_info, session_info);
+	NT_STATUS_NOT_OK_RETURN(nt_status);
+
+	(*session_info)->session_key = data_blob_talloc(*session_info, 
+							gensec_ntlmssp_state->ntlmssp_state->session_key.data,
+							gensec_ntlmssp_state->ntlmssp_state->session_key.length);
+
+	return NT_STATUS_OK;
+}
+
+static BOOL gensec_ntlmssp_have_feature(struct gensec_security *gensec_security,
+					uint32_t feature)
+{
+	struct gensec_ntlmssp_state *gensec_ntlmssp_state = gensec_security->private_data;
+	if (gensec_ntlmssp_state->have_features & feature) {
+		return True;
+	}
+
+	return False;
+}
+
+static const struct gensec_security_ops gensec_ntlmssp_security_ops = {
+	.name		= "ntlmssp",
+	.sasl_name	= "NTLM",
+	.auth_type	= DCERPC_AUTH_TYPE_NTLMSSP,
+	.oid            = GENSEC_OID_NTLMSSP,
+	.client_start   = gensec_ntlmssp_client_start,
+	.server_start   = gensec_ntlmssp_server_start,
+	.update 	= gensec_ntlmssp_update,
+	.sig_size	= gensec_ntlmssp_sig_size,
+	.sign_packet	= gensec_ntlmssp_sign_packet,
+	.check_packet	= gensec_ntlmssp_check_packet,
+	.seal_packet	= gensec_ntlmssp_seal_packet,
+	.unseal_packet	= gensec_ntlmssp_unseal_packet,
+	.wrap           = gensec_ntlmssp_wrap,
+	.unwrap         = gensec_ntlmssp_unwrap,
+	.session_key	= gensec_ntlmssp_session_key,
+	.session_info   = gensec_ntlmssp_session_info,
+	.have_feature   = gensec_ntlmssp_have_feature,
+	.enabled        = True
+};
+
+
+NTSTATUS gensec_ntlmssp_init(void)
+{
+	NTSTATUS ret;
+	ret = gensec_register(&gensec_ntlmssp_security_ops);
+	if (!NT_STATUS_IS_OK(ret)) {
+		DEBUG(0,("Failed to register '%s' gensec backend!\n",
+			gensec_ntlmssp_security_ops.name));
+		return ret;
+	}
+
+	return ret;
+}