r6028: A MAJOR update to intergrate the new credentails system fully with

GENSEC, and to pull SCHANNEL into GENSEC, by making it less 'special'.

GENSEC now no longer has it's own handling of 'set username' etc,
instead it uses cli_credentials calls.

In order to link the credentails code right though Samba, a lot of
interfaces have changed to remove 'username, domain, password'
arguments, and these have been replaced with a single 'struct
cli_credentials'.

In the session setup code, a new parameter 'workgroup' contains the
client/server current workgroup, which seems unrelated to the
authentication exchange (it was being filled in from the auth info).

This allows in particular kerberos to only call back for passwords
when it actually needs to perform the kinit.

The kerberos code has been modified not to use the SPNEGO provided
'principal name' (in the mechListMIC), but to instead use the name the
host was connected to as.  This better matches Microsoft behaviour,
is more secure and allows better use of standard kerberos functions.

To achieve this, I made changes to our socket code so that the
hostname (before name resolution) is now recorded on the socket.

In schannel, most of the code from librpc/rpc/dcerpc_schannel.c is now
in libcli/auth/schannel.c, and it looks much more like a standard
GENSEC module.  The actual sign/seal code moved to
libcli/auth/schannel_sign.c in a previous commit.

The schannel credentails structure is now merged with the rest of the
credentails, as many of the values (username, workstation, domain)
where already present there.  This makes handling this in a generic
manner much easier, as there is no longer a custom entry-point.

The auth_domain module continues to be developed, but is now just as
functional as auth_winbind.  The changes here are consequential to the
schannel changes.

The only removed function at this point is the RPC-LOGIN test
(simulating the load of a WinXP login), which needs much more work to
clean it up (it contains copies of too much code from all over the
torture suite, and I havn't been able to penetrate its 'structure').

Andrew Bartlett
(This used to be commit 2301a4b38a21aa60917973451687063d83d18d66)

1 files changed, 268 insertions, 0 deletions

diff --git a/source4/libcli/auth/schannel.c b/source4/libcli/auth/schannel.c
new file mode 100644
index 0000000000..3dbf10580b
--- /dev/null
+++ b/source4/libcli/auth/schannel.c
@@ -0,0 +1,268 @@
+/* 
+   Unix SMB/CIFS implementation.
+
+   dcerpc schannel operations
+
+   Copyright (C) Andrew Tridgell 2004
+   Copyright (C) Andrew Bartlett <abartlet@samba.org> 2004-2005
+
+   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 "librpc/gen_ndr/ndr_schannel.h"
+#include "auth/auth.h"
+#include "libcli/auth/schannel.h"
+
+static size_t schannel_sig_size(struct gensec_security *gensec_security)
+{
+	return 32;
+}
+
+static NTSTATUS schannel_session_key(struct gensec_security *gensec_security, 
+					    DATA_BLOB *session_key)
+{
+	return NT_STATUS_NOT_IMPLEMENTED;
+}
+
+static NTSTATUS schannel_update(struct gensec_security *gensec_security, TALLOC_CTX *out_mem_ctx, 
+				       const DATA_BLOB in, DATA_BLOB *out) 
+{
+	struct schannel_state *state = gensec_security->private_data;
+	NTSTATUS status;
+	struct schannel_bind bind_schannel;
+	struct schannel_bind_ack bind_schannel_ack;
+	struct creds_CredentialState *creds;
+
+	const char *workstation;
+	const char *domain;
+	*out = data_blob(NULL, 0);
+
+	switch (gensec_security->gensec_role) {
+	case GENSEC_CLIENT:
+		if (state->state != SCHANNEL_STATE_START) {
+			/* we could parse the bind ack, but we don't know what it is yet */
+			return NT_STATUS_OK;
+		}
+
+		state->creds = talloc_reference(state, cli_credentials_get_netlogon_creds(gensec_security->credentials));
+
+		bind_schannel.unknown1 = 0;
+#if 0
+		/* to support this we'd need to have access to the full domain name */
+		bind_schannel.bind_type = 23;
+		bind_schannel.u.info23.domain = cli_credentials_get_domain(gensec_security->credentials);
+		bind_schannel.u.info23.account_name = cli_credentials_get_username(gensec_security->credentials);
+		bind_schannel.u.info23.dnsdomain = str_format_nbt_domain(out_mem_ctx, fulldomainname);
+		bind_schannel.u.info23.workstation = str_format_nbt_domain(out_mem_ctx, cli_credentials_get_workstation(gensec_security->credentials));
+#else
+		bind_schannel.bind_type = 3;
+		bind_schannel.u.info3.domain = cli_credentials_get_domain(gensec_security->credentials);
+		bind_schannel.u.info3.workstation = cli_credentials_get_workstation(gensec_security->credentials);
+#endif
+		
+		status = ndr_push_struct_blob(out, out_mem_ctx, &bind_schannel,
+					      (ndr_push_flags_fn_t)ndr_push_schannel_bind);
+		if (!NT_STATUS_IS_OK(status)) {
+			DEBUG(3, ("Could not create schannel bind: %s\n",
+				  nt_errstr(status)));
+			return status;
+		}
+		
+		state->state = SCHANNEL_STATE_UPDATE_1;
+
+		return NT_STATUS_MORE_PROCESSING_REQUIRED;
+	case GENSEC_SERVER:
+		
+		if (state->state != SCHANNEL_STATE_START) {
+			/* no third leg on this protocol */
+			return NT_STATUS_INVALID_PARAMETER;
+		}
+		
+		/* parse the schannel startup blob */
+		status = ndr_pull_struct_blob(&in, out_mem_ctx, &bind_schannel, 
+					      (ndr_pull_flags_fn_t)ndr_pull_schannel_bind);
+		if (!NT_STATUS_IS_OK(status)) {
+			return status;
+		}
+		
+		if (bind_schannel.bind_type == 23) {
+			workstation = bind_schannel.u.info23.workstation;
+			domain = bind_schannel.u.info23.domain;
+		} else {
+			workstation = bind_schannel.u.info3.workstation;
+			domain = bind_schannel.u.info3.domain;
+		}
+		
+		/* pull the session key for this client */
+		status = schannel_fetch_session_key(out_mem_ctx, workstation, 
+						    domain, &creds);
+		if (!NT_STATUS_IS_OK(status)) {
+			DEBUG(3, ("Could not find session key for attempted schannel connection from %s: %s\n",
+				  workstation, nt_errstr(status)));
+			return status;
+		}
+
+		state->creds = talloc_reference(state, creds);
+
+		bind_schannel_ack.unknown1 = 1;
+		bind_schannel_ack.unknown2 = 0;
+		bind_schannel_ack.unknown3 = 0x6c0000;
+		
+		status = ndr_push_struct_blob(out, out_mem_ctx, &bind_schannel_ack, 
+					      (ndr_push_flags_fn_t)ndr_push_schannel_bind_ack);
+		if (!NT_STATUS_IS_OK(status)) {
+			DEBUG(3, ("Could not return schannel bind ack for client %s: %s\n",
+				  workstation, nt_errstr(status)));
+			return status;
+		}
+
+		state->state = SCHANNEL_STATE_UPDATE_1;
+
+		return NT_STATUS_OK;
+	}
+	return NT_STATUS_INVALID_PARAMETER;
+}
+
+/**
+ * Return the struct creds_CredentialState.
+ *
+ * Make sure not to call this unless gensec is using schannel...
+ */
+
+NTSTATUS dcerpc_schannel_creds(struct gensec_security *gensec_security,
+			       TALLOC_CTX *mem_ctx,
+			       struct creds_CredentialState **creds)
+{ 
+	struct schannel_state *state = gensec_security->private_data;
+
+	*creds = talloc_reference(mem_ctx, state->creds);
+	if (!*creds) {
+		return NT_STATUS_NO_MEMORY;
+	}
+	return NT_STATUS_OK;
+}
+		
+
+/** 
+ * 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 schannel_session_info(struct gensec_security *gensec_security,
+				      struct auth_session_info **session_info)
+{
+	(*session_info) = talloc(gensec_security, struct auth_session_info);
+	NT_STATUS_HAVE_NO_MEMORY(*session_info);
+
+	ZERO_STRUCTP(*session_info);
+
+	return NT_STATUS_OK;
+}
+
+static NTSTATUS schannel_start(struct gensec_security *gensec_security)
+{
+	struct schannel_state *state;
+
+	state = talloc(gensec_security, struct schannel_state);
+	if (!state) {
+		return NT_STATUS_NO_MEMORY;
+	}
+
+	state->state = SCHANNEL_STATE_START;
+	state->seq_num = 0;
+	gensec_security->private_data = state;
+
+	return NT_STATUS_OK;
+}
+
+static NTSTATUS schannel_server_start(struct gensec_security *gensec_security) 
+{
+	NTSTATUS status;
+	struct schannel_state *state;
+
+	status = schannel_start(gensec_security);
+	if (!NT_STATUS_IS_OK(status)) {
+		return status;
+	}
+
+	state = gensec_security->private_data;
+	state->initiator = False;
+		
+	return NT_STATUS_OK;
+}
+
+static NTSTATUS schannel_client_start(struct gensec_security *gensec_security) 
+{
+	NTSTATUS status;
+	struct schannel_state *state;
+
+	status = schannel_start(gensec_security);
+	if (!NT_STATUS_IS_OK(status)) {
+		return status;
+	}
+
+	state = gensec_security->private_data;
+	state->initiator = True;
+		
+	return NT_STATUS_OK;
+}
+
+
+static BOOL schannel_have_feature(struct gensec_security *gensec_security,
+					 uint32_t feature)
+{
+	if (feature & (GENSEC_FEATURE_SIGN | 
+		       GENSEC_FEATURE_SEAL)) {
+		return True;
+	}
+	return False;
+}
+
+
+static const struct gensec_security_ops gensec_schannel_security_ops = {
+	.name		= "schannel",
+	.auth_type	= DCERPC_AUTH_TYPE_SCHANNEL,
+	.client_start   = schannel_client_start,
+	.server_start   = schannel_server_start,
+	.update 	= schannel_update,
+	.seal_packet 	= schannel_seal_packet,
+	.sign_packet   	= schannel_sign_packet,
+	.check_packet	= schannel_check_packet,
+	.unseal_packet 	= schannel_unseal_packet,
+	.session_key	= schannel_session_key,
+	.session_info	= schannel_session_info,
+	.sig_size	= schannel_sig_size,
+	.have_feature   = schannel_have_feature,
+	.enabled        = True
+};
+
+NTSTATUS gensec_schannel_init(void)
+{
+	NTSTATUS ret;
+	ret = gensec_register(&gensec_schannel_security_ops);
+	if (!NT_STATUS_IS_OK(ret)) {
+		DEBUG(0,("Failed to register '%s' gensec backend!\n",
+			gensec_schannel_security_ops.name));
+		return ret;
+	}
+
+	return ret;
+}