s3-dcerpc: Add SPNEGO incapsulation for KRB5 auth

2 files changed, 277 insertions, 0 deletions

diff --git a/source3/librpc/rpc/dcerpc_spnego.c b/source3/librpc/rpc/dcerpc_spnego.c
new file mode 100644
index 0000000000..51d294de5e
--- /dev/null
+++ b/source3/librpc/rpc/dcerpc_spnego.c
@@ -0,0 +1,235 @@
+/*
+ *  SPNEGO Encapsulation
+ *  RPC Pipe client routines
+ *  Copyright (C) Simo Sorce 2010.
+ *
+ *  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 3 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, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "includes.h"
+#include "../libcli/auth/spnego.h"
+#include "dcerpc_spnego.h"
+#include "dcerpc_gssapi.h"
+
+struct spnego_context {
+	enum dcerpc_AuthType auth_type;
+
+	union {
+		struct auth_ntlmssp_state *auth_ntlmssp_state;
+		struct gse_context *gssapi_state;
+	} mech_ctx;
+
+	enum {
+		SPNEGO_CONV_INIT = 0,
+		SPNEGO_CONV_AUTH_MORE,
+		SPNEGO_CONV_AUTH_CONFIRM,
+		SPNEGO_CONV_AUTH_DONE
+	} state;
+};
+
+static NTSTATUS spnego_context_init(TALLOC_CTX *mem_ctx,
+				    enum dcerpc_AuthType auth_type,
+				    struct spnego_context **spnego_ctx)
+{
+	struct spnego_context *sp_ctx;
+
+	sp_ctx = talloc_zero(mem_ctx, struct spnego_context);
+	if (!sp_ctx) {
+		return NT_STATUS_NO_MEMORY;
+	}
+
+	sp_ctx->auth_type = auth_type;
+	sp_ctx->state = SPNEGO_CONV_INIT;
+
+	*spnego_ctx = sp_ctx;
+	return NT_STATUS_OK;
+}
+
+NTSTATUS spnego_gssapi_init_client(TALLOC_CTX *mem_ctx,
+				   enum dcerpc_AuthLevel auth_level,
+				   const char *ccache_name,
+				   const char *server,
+				   const char *service,
+				   const char *username,
+				   const char *password,
+				   uint32_t add_gss_c_flags,
+				   struct spnego_context **spnego_ctx)
+{
+	struct spnego_context *sp_ctx;
+	NTSTATUS status;
+
+	status = spnego_context_init(mem_ctx,
+					DCERPC_AUTH_TYPE_KRB5, &sp_ctx);
+	if (!NT_STATUS_IS_OK(status)) {
+		return status;
+	}
+
+	status = gse_init_client(sp_ctx, DCERPC_AUTH_TYPE_KRB5, auth_level,
+				 ccache_name, server, service,
+				 username, password, add_gss_c_flags,
+				 &sp_ctx->mech_ctx.gssapi_state);
+	if (!NT_STATUS_IS_OK(status)) {
+		TALLOC_FREE(sp_ctx);
+		return status;
+	}
+
+	*spnego_ctx = sp_ctx;
+	return NT_STATUS_OK;
+}
+
+NTSTATUS spnego_get_client_auth_token(TALLOC_CTX *mem_ctx,
+				      struct spnego_context *sp_ctx,
+				      DATA_BLOB *spnego_in,
+				      DATA_BLOB *spnego_out)
+{
+	struct gse_context *gse_ctx;
+	struct spnego_data sp_in, sp_out;
+	DATA_BLOB token_in = data_blob_null;
+	DATA_BLOB token_out = data_blob_null;
+	const char *mech_oids[2] = { NULL, NULL };
+	char *principal = NULL;
+	ssize_t len_in = 0;
+	ssize_t len_out = 0;
+	bool mech_wants_more = false;
+	NTSTATUS status;
+
+	if (!spnego_in->length) {
+		/* server didn't send anything, is init ? */
+		if (sp_ctx->state != SPNEGO_CONV_INIT) {
+			return NT_STATUS_INVALID_PARAMETER;
+		}
+	} else {
+		len_in = spnego_read_data(mem_ctx, *spnego_in, &sp_in);
+		if (len_in == -1) {
+			status = NT_STATUS_INVALID_PARAMETER;
+			goto done;
+		}
+		if (sp_in.type != SPNEGO_NEG_TOKEN_TARG) {
+			status = NT_STATUS_INVALID_PARAMETER;
+			goto done;
+		}
+		if (sp_in.negTokenTarg.negResult == SPNEGO_REJECT) {
+			status = NT_STATUS_ACCESS_DENIED;
+			goto done;
+		}
+		token_in = sp_in.negTokenTarg.responseToken;
+	}
+
+	if (sp_ctx->state == SPNEGO_CONV_AUTH_CONFIRM) {
+		if (sp_in.negTokenTarg.negResult == SPNEGO_ACCEPT_COMPLETED) {
+			sp_ctx->state = SPNEGO_CONV_AUTH_DONE;
+			status = NT_STATUS_OK;
+		} else {
+			status = NT_STATUS_ACCESS_DENIED;
+		}
+		goto done;
+	}
+
+	switch (sp_ctx->auth_type) {
+	case DCERPC_AUTH_TYPE_KRB5:
+
+		gse_ctx = sp_ctx->mech_ctx.gssapi_state;
+		status = gse_get_client_auth_token(mem_ctx, gse_ctx,
+						   &token_in, &token_out);
+		if (!NT_STATUS_IS_OK(status)) {
+			goto done;
+		}
+
+		mech_oids[0] = OID_KERBEROS5;
+		mech_wants_more = gse_require_more_processing(gse_ctx);
+
+		break;
+
+	case DCERPC_AUTH_TYPE_NTLMSSP:
+		status = NT_STATUS_NOT_IMPLEMENTED;
+		goto done;
+	default:
+		status = NT_STATUS_INTERNAL_ERROR;
+		goto done;
+	}
+
+	switch (sp_ctx->state) {
+	case SPNEGO_CONV_INIT:
+		*spnego_out = spnego_gen_negTokenInit(mem_ctx, mech_oids,
+						      &token_out, principal);
+		if (!spnego_out->data) {
+			status = NT_STATUS_INTERNAL_ERROR;
+			goto done;
+		}
+		sp_ctx->state = SPNEGO_CONV_AUTH_MORE;
+		break;
+
+	case SPNEGO_CONV_AUTH_MORE:
+		/* server says it's done and we do not seem to agree */
+		if (sp_in.negTokenTarg.negResult ==
+						SPNEGO_ACCEPT_COMPLETED) {
+			status = NT_STATUS_INVALID_PARAMETER;
+			goto done;
+		}
+
+		sp_out.type = SPNEGO_NEG_TOKEN_TARG;
+		sp_out.negTokenTarg.negResult = SPNEGO_NONE_RESULT;
+		sp_out.negTokenTarg.supportedMech = NULL;
+		sp_out.negTokenTarg.responseToken = token_out;
+		sp_out.negTokenTarg.mechListMIC = data_blob_null;
+
+		len_out = spnego_write_data(mem_ctx, spnego_out, &sp_out);
+		if (len_out == -1) {
+			status = NT_STATUS_INTERNAL_ERROR;
+			goto done;
+		}
+
+		if (!mech_wants_more) {
+			/* we still need to get an ack from the server */
+			sp_ctx->state = SPNEGO_CONV_AUTH_CONFIRM;
+		}
+
+		break;
+
+	default:
+		status = NT_STATUS_INTERNAL_ERROR;
+		goto done;
+	}
+
+	status = NT_STATUS_OK;
+
+done:
+	if (len_in > 0) {
+		spnego_free_data(&sp_in);
+	}
+	data_blob_free(&token_out);
+	return status;
+}
+
+bool spnego_require_more_processing(struct spnego_context *sp_ctx)
+{
+	struct gse_context *gse_ctx;
+
+	/* see if spnego processing itself requires more */
+	if (sp_ctx->state == SPNEGO_CONV_AUTH_MORE ||
+	    sp_ctx->state == SPNEGO_CONV_AUTH_CONFIRM) {
+		return true;
+	}
+
+	/* otherwise see if underlying mechnism does */
+	switch (sp_ctx->auth_type) {
+	case DCERPC_AUTH_TYPE_KRB5:
+		gse_ctx = sp_ctx->mech_ctx.gssapi_state;
+		return gse_require_more_processing(gse_ctx);
+	default:
+		DEBUG(0, ("Unsupported type in request!\n"));
+		return false;
+	}
+}
+
diff --git a/source3/librpc/rpc/dcerpc_spnego.h b/source3/librpc/rpc/dcerpc_spnego.h
new file mode 100644
index 0000000000..7f48f39498
--- /dev/null
+++ b/source3/librpc/rpc/dcerpc_spnego.h
@@ -0,0 +1,42 @@
+/*
+ *  SPNEGO Encapsulation
+ *  RPC Pipe client routines
+ *  Copyright (C) Simo Sorce 2010.
+ *
+ *  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 3 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, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef _DCERPC_SPNEGO_H_
+#define _DCERPC_SPENGO_H_
+
+struct spnego_context;
+
+NTSTATUS spnego_gssapi_init_client(TALLOC_CTX *mem_ctx,
+				   enum dcerpc_AuthLevel auth_level,
+				   const char *ccache_name,
+				   const char *server,
+				   const char *service,
+				   const char *username,
+				   const char *password,
+				   uint32_t add_gss_c_flags,
+				   struct spnego_context **spengo_ctx);
+
+NTSTATUS spnego_get_client_auth_token(TALLOC_CTX *mem_ctx,
+				      struct spnego_context *sp_ctx,
+				      DATA_BLOB *spnego_in,
+				      DATA_BLOB *spnego_out);
+
+bool spnego_require_more_processing(struct spnego_context *sp_ctx);
+
+#endif /* _DCERPC_SPENGO_H_ */