s3-librpc Call SPENGO/GSSAPI via the auth_generic layer and gensec

This simplifies a lot of code, as we know we are always dealing
with a struct gensec_security, and allows the gensec module being
used to implement GSSAPI to be swapped for AD-server operation.

Andrew Bartlett

Signed-off-by: Stefan Metzmacher <metze@samba.org>

6 files changed, 53 insertions, 231 deletions

diff --git a/source3/librpc/crypto/cli_spnego.c b/source3/librpc/crypto/cli_spnego.c
index 97e6a8152b..0a4bd18b22 100644
--- a/source3/librpc/crypto/cli_spnego.c
+++ b/source3/librpc/crypto/cli_spnego.c
@@ -46,44 +46,6 @@ static NTSTATUS spnego_context_init(TALLOC_CTX *mem_ctx,
 	return NT_STATUS_OK;
 }
 
-NTSTATUS spnego_gssapi_init_client(TALLOC_CTX *mem_ctx,
-				   bool do_sign, bool do_seal,
-				   bool is_dcerpc,
-				   const char *ccache_name,
-				   const char *server,
-				   const char *service,
-				   const char *username,
-				   const char *password,
-				   struct spnego_context **spnego_ctx)
-{
-	struct spnego_context *sp_ctx = NULL;
-	uint32_t add_gss_c_flags = 0;
-	NTSTATUS status;
-
-	status = spnego_context_init(mem_ctx, do_sign, do_seal, &sp_ctx);
-	if (!NT_STATUS_IS_OK(status)) {
-		return status;
-	}
-	sp_ctx->mech = SPNEGO_KRB5;
-
-	if (is_dcerpc) {
-		add_gss_c_flags = GSS_C_DCE_STYLE;
-	}
-
-	status = gse_init_client(sp_ctx,
-				 do_sign, do_seal,
-				 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_generic_init_client(TALLOC_CTX *mem_ctx,
 				    const char *oid,
 				    bool do_sign, bool do_seal,
@@ -181,7 +143,6 @@ NTSTATUS spnego_get_client_auth_token(TALLOC_CTX *mem_ctx,
 				      DATA_BLOB *spnego_in,
 				      DATA_BLOB *spnego_out)
 {
-	struct gse_context *gse_ctx;
 	struct gensec_security *gensec_security;
 	struct spnego_data sp_in, sp_out;
 	DATA_BLOB token_in = data_blob_null;
@@ -190,7 +151,6 @@ NTSTATUS spnego_get_client_auth_token(TALLOC_CTX *mem_ctx,
 	char *principal = NULL;
 	ssize_t len_in = 0;
 	ssize_t len_out = 0;
-	bool mech_wants_more = false;
 	NTSTATUS status;
 
 	if (!spnego_in->length) {
@@ -228,33 +188,11 @@ NTSTATUS spnego_get_client_auth_token(TALLOC_CTX *mem_ctx,
 
 	switch (sp_ctx->mech) {
 	case SPNEGO_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 SPNEGO_NTLMSSP:
-
-		gensec_security = sp_ctx->mech_ctx.gensec_security;
-		status = gensec_update(gensec_security, mem_ctx, NULL,
-				       token_in, &token_out);
-		if (NT_STATUS_EQUAL(status,
-				    NT_STATUS_MORE_PROCESSING_REQUIRED)) {
-			mech_wants_more = true;
-		} else if (!NT_STATUS_IS_OK(status)) {
-			goto done;
-		}
-
 		mech_oids[0] = OID_NTLMSSP;
-
 		break;
 
 	default:
@@ -262,6 +200,17 @@ NTSTATUS spnego_get_client_auth_token(TALLOC_CTX *mem_ctx,
 		goto done;
 	}
 
+	gensec_security = sp_ctx->mech_ctx.gensec_security;
+	status = gensec_update(gensec_security, mem_ctx, NULL,
+			       token_in, &token_out);
+	sp_ctx->more_processing = false;
+	if (NT_STATUS_EQUAL(status,
+			    NT_STATUS_MORE_PROCESSING_REQUIRED)) {
+		sp_ctx->more_processing = true;
+	} else if (!NT_STATUS_IS_OK(status)) {
+		goto done;
+	}
+
 	switch (sp_ctx->state) {
 	case SPNEGO_CONV_INIT:
 		*spnego_out = spnego_gen_negTokenInit(mem_ctx, mech_oids,
@@ -293,7 +242,7 @@ NTSTATUS spnego_get_client_auth_token(TALLOC_CTX *mem_ctx,
 			goto done;
 		}
 
-		if (!mech_wants_more) {
+		if (!sp_ctx->more_processing) {
 			/* we still need to get an ack from the server */
 			sp_ctx->state = SPNEGO_CONV_AUTH_CONFIRM;
 		}
@@ -317,7 +266,6 @@ done:
 
 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 ||
@@ -328,10 +276,8 @@ bool spnego_require_more_processing(struct spnego_context *sp_ctx)
 	/* otherwise see if underlying mechnism does */
 	switch (sp_ctx->mech) {
 	case SPNEGO_KRB5:
-		gse_ctx = sp_ctx->mech_ctx.gssapi_state;
-		return gse_require_more_processing(gse_ctx);
 	case SPNEGO_NTLMSSP:
-		return false;
+		return sp_ctx->more_processing;
 	default:
 		DEBUG(0, ("Unsupported type in request!\n"));
 		return false;
@@ -340,12 +286,10 @@ bool spnego_require_more_processing(struct spnego_context *sp_ctx)
 
 NTSTATUS spnego_get_negotiated_mech(struct spnego_context *sp_ctx,
 				    enum spnego_mech *type,
-				    void **auth_context)
+				    struct gensec_security **auth_context)
 {
 	switch (sp_ctx->mech) {
 	case SPNEGO_KRB5:
-		*auth_context = sp_ctx->mech_ctx.gssapi_state;
-		break;
 	case SPNEGO_NTLMSSP:
 		*auth_context = sp_ctx->mech_ctx.gensec_security;
 		break;
@@ -364,8 +308,6 @@ DATA_BLOB spnego_get_session_key(TALLOC_CTX *mem_ctx,
 	NTSTATUS status;
 	switch (sp_ctx->mech) {
 	case SPNEGO_KRB5:
-		return gse_get_session_key(mem_ctx,
-					   sp_ctx->mech_ctx.gssapi_state);
 	case SPNEGO_NTLMSSP:
 		status = gensec_session_key(sp_ctx->mech_ctx.gensec_security, mem_ctx, &sk);
 		if (!NT_STATUS_IS_OK(status)) {
@@ -385,9 +327,6 @@ NTSTATUS spnego_sign(TALLOC_CTX *mem_ctx,
 {
 	switch(sp_ctx->mech) {
 	case SPNEGO_KRB5:
-		return gse_sign(mem_ctx,
-				sp_ctx->mech_ctx.gssapi_state,
-				data, signature);
 	case SPNEGO_NTLMSSP:
 		return gensec_sign_packet(
 			sp_ctx->mech_ctx.gensec_security,
@@ -407,9 +346,6 @@ NTSTATUS spnego_sigcheck(TALLOC_CTX *mem_ctx,
 {
 	switch(sp_ctx->mech) {
 	case SPNEGO_KRB5:
-		return gse_sigcheck(mem_ctx,
-				    sp_ctx->mech_ctx.gssapi_state,
-				    data, signature);
 	case SPNEGO_NTLMSSP:
 		return gensec_check_packet(
 			sp_ctx->mech_ctx.gensec_security,
@@ -428,9 +364,6 @@ NTSTATUS spnego_seal(TALLOC_CTX *mem_ctx,
 {
 	switch(sp_ctx->mech) {
 	case SPNEGO_KRB5:
-		return gse_seal(mem_ctx,
-				sp_ctx->mech_ctx.gssapi_state,
-				data, signature);
 	case SPNEGO_NTLMSSP:
 		return gensec_seal_packet(
 			sp_ctx->mech_ctx.gensec_security,
@@ -450,9 +383,6 @@ NTSTATUS spnego_unseal(TALLOC_CTX *mem_ctx,
 {
 	switch(sp_ctx->mech) {
 	case SPNEGO_KRB5:
-		return gse_unseal(mem_ctx,
-				    sp_ctx->mech_ctx.gssapi_state,
-				    data, signature);
 	case SPNEGO_NTLMSSP:
 		return gensec_unseal_packet(
 			sp_ctx->mech_ctx.gensec_security,
diff --git a/source3/librpc/crypto/spnego.h b/source3/librpc/crypto/spnego.h
index a31f997ab6..57396a63c5 100644
--- a/source3/librpc/crypto/spnego.h
+++ b/source3/librpc/crypto/spnego.h
@@ -31,7 +31,6 @@ struct spnego_context {
 
 	union {
 		struct gensec_security *gensec_security;
-		struct gse_context *gssapi_state;
 	} mech_ctx;
 
 	char *oid_list[ASN1_MAX_OIDS];
@@ -50,17 +49,10 @@ struct spnego_context {
 	bool is_dcerpc;
 
 	struct tsocket_address *remote_address;
+
+	bool more_processing; /* Current mech state requires more processing */
 };
 
-NTSTATUS spnego_gssapi_init_client(TALLOC_CTX *mem_ctx,
-				   bool do_sign, bool do_seal,
-				   bool is_dcerpc,
-				   const char *ccache_name,
-				   const char *server,
-				   const char *service,
-				   const char *username,
-				   const char *password,
-				   struct spnego_context **spengo_ctx);
 NTSTATUS spnego_generic_init_client(TALLOC_CTX *mem_ctx,
 				    const char *oid,
 				    bool do_sign, bool do_seal,
@@ -81,7 +73,7 @@ bool spnego_require_more_processing(struct spnego_context *sp_ctx);
 
 NTSTATUS spnego_get_negotiated_mech(struct spnego_context *sp_ctx,
 				    enum spnego_mech *type,
-				    void **auth_context);
+				    struct gensec_security **auth_context);
 
 DATA_BLOB spnego_get_session_key(TALLOC_CTX *mem_ctx,
 				 struct spnego_context *sp_ctx);
diff --git a/source3/librpc/rpc/dcerpc_helpers.c b/source3/librpc/rpc/dcerpc_helpers.c
index 4cfe7933fe..ed0e0fe932 100644
--- a/source3/librpc/rpc/dcerpc_helpers.c
+++ b/source3/librpc/rpc/dcerpc_helpers.c
@@ -268,10 +268,7 @@ NTSTATUS dcerpc_guess_sizes(struct pipe_auth_data *auth,
 	struct gensec_security *gensec_security;
 	struct schannel_state *schannel_auth;
 	struct spnego_context *spnego_ctx;
-	struct gse_context *gse_ctx;
 	enum spnego_mech auth_type;
-	void *auth_ctx;
-	bool seal = false;
 	NTSTATUS status;
 
 	/* no auth token cases first */
@@ -287,7 +284,6 @@ NTSTATUS dcerpc_guess_sizes(struct pipe_auth_data *auth,
 		return NT_STATUS_OK;
 
 	case DCERPC_AUTH_LEVEL_PRIVACY:
-		seal = true;
 		break;
 
 	case DCERPC_AUTH_LEVEL_INTEGRITY:
@@ -308,30 +304,11 @@ NTSTATUS dcerpc_guess_sizes(struct pipe_auth_data *auth,
 		spnego_ctx = talloc_get_type_abort(auth->auth_ctx,
 						   struct spnego_context);
 		status = spnego_get_negotiated_mech(spnego_ctx,
-						    &auth_type, &auth_ctx);
+						    &auth_type, &gensec_security);
 		if (!NT_STATUS_IS_OK(status)) {
 			return status;
 		}
-		switch (auth_type) {
-		case SPNEGO_NTLMSSP:
-			gensec_security = talloc_get_type_abort(auth_ctx,
-								struct gensec_security);
-			*auth_len = gensec_sig_size(gensec_security, max_len);
-			break;
-
-		case SPNEGO_KRB5:
-			gse_ctx = talloc_get_type_abort(auth_ctx,
-							struct gse_context);
-			if (!gse_ctx) {
-				return NT_STATUS_INVALID_PARAMETER;
-			}
-			*auth_len = gse_get_signature_length(gse_ctx,
-							     seal, max_len);
-			break;
-
-		default:
-			return NT_STATUS_INVALID_PARAMETER;
-		}
+		*auth_len = gensec_sig_size(gensec_security, max_len);
 		break;
 
 	case DCERPC_AUTH_TYPE_NTLMSSP:
diff --git a/source3/rpc_client/cli_pipe.c b/source3/rpc_client/cli_pipe.c
index ce8ab819c5..f3a334a052 100644
--- a/source3/rpc_client/cli_pipe.c
+++ b/source3/rpc_client/cli_pipe.c
@@ -2939,6 +2939,7 @@ NTSTATUS cli_rpc_pipe_open_spnego_krb5(struct cli_state *cli,
 	struct pipe_auth_data *auth;
 	struct spnego_context *spnego_ctx;
 	NTSTATUS status;
+	const char *target_service = "cifs"; /* TODO: Determine target service from the bindings or interface table */
 
 	status = cli_rpc_pipe_open(cli, transport, interface, &result);
 	if (!NT_STATUS_IS_OK(status)) {
@@ -2969,15 +2970,16 @@ NTSTATUS cli_rpc_pipe_open_spnego_krb5(struct cli_state *cli,
 		goto err_out;
 	}
 
-	status = spnego_gssapi_init_client(auth,
-					   (auth->auth_level ==
+	status = spnego_generic_init_client(auth,
+					    GENSEC_OID_KERBEROS5,
+					    (auth->auth_level ==
 						DCERPC_AUTH_LEVEL_INTEGRITY),
-					   (auth->auth_level ==
+					    (auth->auth_level ==
 						DCERPC_AUTH_LEVEL_PRIVACY),
-					   true,
-					   NULL, server, "cifs",
-					   username, password,
-					   &spnego_ctx);
+					    true,
+					    server, target_service,
+					    auth->domain, auth->user_name, password,
+					    &spnego_ctx);
 	if (!NT_STATUS_IS_OK(status)) {
 		DEBUG(0, ("spnego_init_client returned %s\n",
 			  nt_errstr(status)));
diff --git a/source3/rpc_server/dcesrv_spnego.c b/source3/rpc_server/dcesrv_spnego.c
index e89563a9fb..1bea2321ef 100644
--- a/source3/rpc_server/dcesrv_spnego.c
+++ b/source3/rpc_server/dcesrv_spnego.c
@@ -23,6 +23,7 @@
 #include "dcesrv_auth_generic.h"
 #include "dcesrv_gssapi.h"
 #include "dcesrv_spnego.h"
+#include "auth/gensec/gensec.h"
 
 static NTSTATUS spnego_init_server(TALLOC_CTX *mem_ctx,
 				   bool do_sign, bool do_seal,
@@ -55,51 +56,38 @@ static NTSTATUS spnego_server_mech_init(struct spnego_context *sp_ctx,
 					DATA_BLOB *token_out)
 {
 	struct gensec_security *gensec_security;
-	struct gse_context *gse_ctx;
 	NTSTATUS status;
+	const char *oid;
 
 	switch (sp_ctx->mech) {
 	case SPNEGO_KRB5:
-		status = gssapi_server_auth_start(sp_ctx,
-						  sp_ctx->do_sign,
-						  sp_ctx->do_seal,
-						  sp_ctx->is_dcerpc,
-						  token_in,
-						  token_out,
-						  &gse_ctx);
-		if (!NT_STATUS_IS_OK(status)) {
-			DEBUG(0, ("Failed to init gssapi server "
-				  "(%s)\n", nt_errstr(status)));
-			return status;
-		}
-
-		sp_ctx->mech_ctx.gssapi_state = gse_ctx;
+		oid = GENSEC_OID_KERBEROS5;
 		break;
-
 	case SPNEGO_NTLMSSP:
-		status = auth_generic_server_start(sp_ctx,
-						   OID_NTLMSSP,
-						   sp_ctx->do_sign,
-						   sp_ctx->do_seal,
-						   sp_ctx->is_dcerpc,
-						   token_in,
-						   token_out,
-						   sp_ctx->remote_address,
-						   &gensec_security);
-		if (!NT_STATUS_IS_OK(status)) {
-			DEBUG(0, ("Failed to init ntlmssp server "
-				  "(%s)\n", nt_errstr(status)));
-			return status;
-		}
-
-		sp_ctx->mech_ctx.gensec_security = gensec_security;
+		oid = GENSEC_OID_NTLMSSP;
 		break;
-
 	default:
 		DEBUG(3, ("No known mechanisms available\n"));
 		return NT_STATUS_INVALID_PARAMETER;
 	}
 
+	status = auth_generic_server_start(sp_ctx,
+					   oid,
+					   sp_ctx->do_sign,
+					   sp_ctx->do_seal,
+					   sp_ctx->is_dcerpc,
+					   token_in,
+					   token_out,
+					   sp_ctx->remote_address,
+					   &gensec_security);
+	if (!NT_STATUS_IS_OK(status)) {
+		DEBUG(0, ("Failed to init ntlmssp server "
+			  "(%s)\n", nt_errstr(status)));
+		return status;
+	}
+
+	sp_ctx->mech_ctx.gensec_security = gensec_security;
+
 	return NT_STATUS_OK;
 }
 
@@ -150,10 +138,6 @@ NTSTATUS spnego_server_step(struct spnego_context *sp_ctx,
 
 		switch(sp_ctx->mech) {
 		case SPNEGO_KRB5:
-			status = gssapi_server_step(
-					sp_ctx->mech_ctx.gssapi_state,
-					mem_ctx, &token_in, &token_out);
-			break;
 		case SPNEGO_NTLMSSP:
 			status = auth_generic_server_step(
 					sp_ctx->mech_ctx.gensec_security,
diff --git a/source3/rpc_server/srv_pipe.c b/source3/rpc_server/srv_pipe.c
index 605ed5420c..18389b42e0 100644
--- a/source3/rpc_server/srv_pipe.c
+++ b/source3/rpc_server/srv_pipe.c
@@ -676,52 +676,11 @@ static bool pipe_auth_generic_verify_final(TALLOC_CTX *mem_ctx,
 	return true;
 }
 
-static NTSTATUS pipe_gssapi_verify_final(TALLOC_CTX *mem_ctx,
-					 struct gse_context *gse_ctx,
-					 const struct tsocket_address *remote_address,
-					 struct auth_session_info **session_info)
-{
-	NTSTATUS status;
-	bool bret;
-
-	/* Finally - if the pipe negotiated integrity (sign) or privacy (seal)
-	   ensure the underlying flags are also set. If not we should
-	   refuse the bind. */
-
-	status = gssapi_server_check_flags(gse_ctx);
-	if (!NT_STATUS_IS_OK(status)) {
-		DEBUG(0, ("Requested Security Layers not honored!\n"));
-		return status;
-	}
-
-	status = gssapi_server_get_user_info(gse_ctx, mem_ctx,
-					     remote_address, session_info);
-	if (!NT_STATUS_IS_OK(status)) {
-		DEBUG(0, (__location__ ": failed to obtain the server info "
-			  "for authenticated user: %s\n", nt_errstr(status)));
-		return status;
-	}
-
-	/*
-	 * We're an authenticated bind over smb, so the session key needs to
-	 * be set to "SystemLibraryDTC". Weird, but this is what Windows
-	 * does. See the RPC-SAMBA3SESSIONKEY.
-	 */
-
-	bret = session_info_set_session_key((*session_info), generic_session_key());
-	if (!bret) {
-		return NT_STATUS_ACCESS_DENIED;
-	}
-
-	return NT_STATUS_OK;
-}
-
 static NTSTATUS pipe_auth_verify_final(struct pipes_struct *p)
 {
 	enum spnego_mech auth_type;
 	struct gensec_security *gensec_security;
 	struct spnego_context *spnego_ctx;
-	struct gse_context *gse_ctx;
 	void *mech_ctx;
 	NTSTATUS status;
 
@@ -740,37 +699,15 @@ static NTSTATUS pipe_auth_verify_final(struct pipes_struct *p)
 		spnego_ctx = talloc_get_type_abort(p->auth.auth_ctx,
 						   struct spnego_context);
 		status = spnego_get_negotiated_mech(spnego_ctx,
-						    &auth_type, &mech_ctx);
+						    &auth_type, &gensec_security);
 		if (!NT_STATUS_IS_OK(status)) {
 			DEBUG(0, ("Bad SPNEGO state (%s)\n",
 				  nt_errstr(status)));
 			return status;
 		}
-		switch(auth_type) {
-		case SPNEGO_KRB5:
-			gse_ctx = talloc_get_type_abort(mech_ctx,
-							struct gse_context);
-			status = pipe_gssapi_verify_final(p, gse_ctx,
-							  p->remote_address,
-							  &p->session_info);
-			if (!NT_STATUS_IS_OK(status)) {
-				DEBUG(1, ("gssapi bind failed with: %s",
-					  nt_errstr(status)));
-				return status;
-			}
-			break;
-		case SPNEGO_NTLMSSP:
-			gensec_security = talloc_get_type_abort(mech_ctx,
-						struct gensec_security);
-			if (!pipe_auth_generic_verify_final(p, gensec_security,
-							p->auth.auth_level,
-							&p->session_info)) {
-				return NT_STATUS_ACCESS_DENIED;
-			}
-			break;
-		default:
-			DEBUG(0, (__location__ ": incorrect spnego type "
-				  "(%d).\n", auth_type));
+		if (!pipe_auth_generic_verify_final(p, gensec_security,
+						    p->auth.auth_level,
+						    &p->session_info)) {
 			return NT_STATUS_ACCESS_DENIED;
 		}
 		break;