+++ /dev/null
-/*
- Unix SMB/CIFS implementation.
-
- GSSAPI KRB5 backend for GENSEC
-
- Copyright (C) Andrew Bartlett <abartlet@samba.org> 2004
- Copyright (C) Stefan Metzmacher <metze@samba.org> 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 "system/kerberos.h"
-#include "system/time.h"
-#include "auth/kerberos/kerberos.h"
-#include "auth/auth.h"
-
-static const gss_OID_desc gensec_gss_krb5_mechanism_oid_desc =
- {9, (void *)discard_const_p(char, "\x2a\x86\x48\x86\xf7\x12\x01\x02\x02")};
-
-enum GENSEC_GSSKRB5_STATE {
- GENSEC_GSSKRB5_CLIENT_START,
- GENSEC_GSSKRB5_CLIENT_MUTUAL_AUTH,
- GENSEC_GSSKRB5_CLIENT_DCE_STYLE,
- GENSEC_GSSKRB5_DONE
-};
-
-struct gensec_gsskrb5_state {
- enum GENSEC_GSSKRB5_STATE state_position;
- gss_ctx_id_t gssapi_context;
- struct gss_channel_bindings_struct *input_chan_bindings;
- gss_name_t server_name;
- gss_name_t client_name;
- OM_uint32 want_flags, got_flags;
-};
-
-static int gensec_gsskrb5_destory(void *ptr)
-{
- struct gensec_gsskrb5_state *gensec_gsskrb5_state = ptr;
- OM_uint32 maj_stat, min_stat;
-
- if (gensec_gsskrb5_state->gssapi_context != GSS_C_NO_CONTEXT) {
- maj_stat = gss_delete_sec_context (&min_stat,
- &gensec_gsskrb5_state->gssapi_context,
- GSS_C_NO_BUFFER);
- }
-
- if (gensec_gsskrb5_state->server_name != GSS_C_NO_NAME) {
- maj_stat = gss_release_name(&min_stat, &gensec_gsskrb5_state->server_name);
- }
- if (gensec_gsskrb5_state->client_name != GSS_C_NO_NAME) {
- maj_stat = gss_release_name(&min_stat, &gensec_gsskrb5_state->client_name);
- }
- return 0;
-}
-
-static NTSTATUS gensec_gsskrb5_start(struct gensec_security *gensec_security)
-{
- struct gensec_gsskrb5_state *gensec_gsskrb5_state;
-
- gensec_gsskrb5_state = talloc(gensec_security, struct gensec_gsskrb5_state);
- if (!gensec_gsskrb5_state) {
- return NT_STATUS_NO_MEMORY;
- }
-
- gensec_security->private_data = gensec_gsskrb5_state;
-
- gensec_gsskrb5_state->gssapi_context = GSS_C_NO_CONTEXT;
- gensec_gsskrb5_state->server_name = GSS_C_NO_NAME;
- gensec_gsskrb5_state->client_name = GSS_C_NO_NAME;
-
- talloc_set_destructor(gensec_gsskrb5_state, gensec_gsskrb5_destory);
-
- /* TODO: Fill in channel bindings */
- gensec_gsskrb5_state->input_chan_bindings = GSS_C_NO_CHANNEL_BINDINGS;
-
- gensec_gsskrb5_state->want_flags = GSS_C_MUTUAL_FLAG;
- gensec_gsskrb5_state->got_flags = 0;
-
- if (gensec_security->want_features & GENSEC_FEATURE_SESSION_KEY) {
- /* GSSAPI won't give us the session keys */
- return NT_STATUS_INVALID_PARAMETER;
- }
- if (gensec_security->want_features & GENSEC_FEATURE_SIGN) {
- gensec_gsskrb5_state->want_flags |= GSS_C_INTEG_FLAG;
- }
- if (gensec_security->want_features & GENSEC_FEATURE_SEAL) {
- gensec_gsskrb5_state->want_flags |= GSS_C_CONF_FLAG;
- }
- if (gensec_security->want_features & GENSEC_FEATURE_DCE_STYLE) {
- gensec_gsskrb5_state->want_flags |= GSS_C_DCE_STYLE;
- }
-
- return NT_STATUS_OK;
-}
-
-static NTSTATUS gensec_gsskrb5_client_start(struct gensec_security *gensec_security)
-{
- struct gensec_gsskrb5_state *gensec_gsskrb5_state;
- NTSTATUS nt_status;
- gss_buffer_desc name_token;
- OM_uint32 maj_stat, min_stat;
-
- gss_OID_desc hostbased = {10,
- (void *)discard_const_p(char, "\x2a\x86\x48\x86\xf7\x12"
- "\x01\x02\x01\x04")};
-
- nt_status = gensec_gsskrb5_start(gensec_security);
- if (!NT_STATUS_IS_OK(nt_status)) {
- return nt_status;
- }
-
- gensec_gsskrb5_state = gensec_security->private_data;
-
- gensec_gsskrb5_state->state_position = GENSEC_GSSKRB5_CLIENT_START;
-
- name_token.value = talloc_asprintf(gensec_gsskrb5_state, "%s@%s", gensec_get_target_service(gensec_security),
- gensec_get_target_hostname(gensec_security));
- DEBUG(0, ("name: %s\n", (char *)name_token.value));
- name_token.length = strlen(name_token.value);
-
- maj_stat = gss_import_name (&min_stat,
- &name_token,
- &hostbased,
- &gensec_gsskrb5_state->server_name);
- if (maj_stat) {
- return NT_STATUS_UNSUCCESSFUL;
- }
-
- return NT_STATUS_OK;
-}
-
-/**
- * Next state function for the GSSKRB5 GENSEC mechanism
- *
- * @param gensec_gsskrb5_state GSSAPI State
- * @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_gsskrb5_update(struct gensec_security *gensec_security,
- TALLOC_CTX *out_mem_ctx,
- const DATA_BLOB in, DATA_BLOB *out)
-{
- struct gensec_gsskrb5_state *gensec_gsskrb5_state = gensec_security->private_data;
- NTSTATUS nt_status = NT_STATUS_UNSUCCESSFUL;
- OM_uint32 maj_stat, min_stat;
- OM_uint32 min_stat2;
- gss_buffer_desc input_token, output_token;
-
- *out = data_blob(NULL, 0);
-
- input_token.length = in.length;
- input_token.value = in.data;
-
- switch (gensec_gsskrb5_state->state_position) {
- case GENSEC_GSSKRB5_CLIENT_START:
- {
- maj_stat = gss_init_sec_context(&min_stat,
- GSS_C_NO_CREDENTIAL,
- &gensec_gsskrb5_state->gssapi_context,
- gensec_gsskrb5_state->server_name,
- discard_const_p(gss_OID_desc, &gensec_gss_krb5_mechanism_oid_desc),
- gensec_gsskrb5_state->want_flags,
- 0,
- gensec_gsskrb5_state->input_chan_bindings,
- &input_token,
- NULL,
- &output_token,
- &gensec_gsskrb5_state->got_flags, /* ret flags */
- NULL);
- *out = data_blob_talloc(out_mem_ctx, output_token.value, output_token.length);
- if (out->length != output_token.length) {
- gss_release_buffer(&min_stat2, &output_token);
- return NT_STATUS_NO_MEMORY;
- }
- gss_release_buffer(&min_stat2, &output_token);
-
- if (maj_stat == GSS_S_COMPLETE) {
- gensec_gsskrb5_state->state_position = GENSEC_GSSKRB5_DONE;
- return NT_STATUS_OK;
- } else if (maj_stat == GSS_S_CONTINUE_NEEDED) {
- gensec_gsskrb5_state->state_position = GENSEC_GSSKRB5_CLIENT_MUTUAL_AUTH;
- return NT_STATUS_MORE_PROCESSING_REQUIRED;
- } else {
- gss_buffer_desc msg1, msg2;
- OM_uint32 msg_ctx = 0;
-
- msg1.value = NULL;
- msg2.value = NULL;
- gss_display_status(&min_stat2, maj_stat, GSS_C_GSS_CODE,
- GSS_C_NULL_OID, &msg_ctx, &msg1);
- gss_display_status(&min_stat2, min_stat, GSS_C_MECH_CODE,
- GSS_C_NULL_OID, &msg_ctx, &msg2);
- DEBUG(1, ("gensec_gsskrb5_update: %s : %s\n", (char *)msg1.value, (char *)msg2.value));
- gss_release_buffer(&min_stat2, &msg1);
- gss_release_buffer(&min_stat2, &msg2);
-
- return nt_status;
- }
- break;
- }
- case GENSEC_GSSKRB5_CLIENT_MUTUAL_AUTH:
- {
- maj_stat = gss_init_sec_context(&min_stat,
- GSS_C_NO_CREDENTIAL,
- &gensec_gsskrb5_state->gssapi_context,
- gensec_gsskrb5_state->server_name,
- discard_const_p(gss_OID_desc, &gensec_gss_krb5_mechanism_oid_desc),
- gensec_gsskrb5_state->want_flags,
- 0,
- gensec_gsskrb5_state->input_chan_bindings,
- &input_token,
- NULL,
- &output_token,
- &gensec_gsskrb5_state->got_flags, /* ret flags */
- NULL);
- *out = data_blob_talloc(out_mem_ctx, output_token.value, output_token.length);
- if (out->length != output_token.length) {
- gss_release_buffer(&min_stat2, &output_token);
- return NT_STATUS_NO_MEMORY;
- }
- gss_release_buffer(&min_stat2, &output_token);
-
- if (maj_stat == GSS_S_COMPLETE) {
- if (gensec_gsskrb5_state->got_flags & GSS_C_DCE_STYLE) {
- gensec_gsskrb5_state->state_position = GENSEC_GSSKRB5_CLIENT_DCE_STYLE;
- return NT_STATUS_MORE_PROCESSING_REQUIRED;
- }
- gensec_gsskrb5_state->state_position = GENSEC_GSSKRB5_DONE;
- return NT_STATUS_OK;
- } else if (maj_stat == GSS_S_CONTINUE_NEEDED) {
- gensec_gsskrb5_state->state_position = GENSEC_GSSKRB5_CLIENT_DCE_STYLE;
- return NT_STATUS_MORE_PROCESSING_REQUIRED;
- } else {
- gss_buffer_desc msg1, msg2;
- OM_uint32 msg_ctx = 0;
-
- msg1.value = NULL;
- msg2.value = NULL;
- gss_display_status(&min_stat2, maj_stat, GSS_C_GSS_CODE,
- GSS_C_NULL_OID, &msg_ctx, &msg1);
- gss_display_status(&min_stat2, min_stat, GSS_C_MECH_CODE,
- GSS_C_NULL_OID, &msg_ctx, &msg2);
- DEBUG(1, ("gensec_gsskrb5_update: %s : %s\n", (char *)msg1.value, (char *)msg2.value));
- gss_release_buffer(&min_stat2, &msg1);
- gss_release_buffer(&min_stat2, &msg2);
-
- return nt_status;
- }
- break;
- }
- case GENSEC_GSSKRB5_CLIENT_DCE_STYLE:
- {
- gensec_gsskrb5_state->state_position = GENSEC_GSSKRB5_DONE;
- return NT_STATUS_OK;
- }
- case GENSEC_GSSKRB5_DONE:
- {
- return NT_STATUS_OK;
- }
- default:
- return NT_STATUS_INVALID_PARAMETER;
- }
-
- return NT_STATUS_INVALID_PARAMETER;
-}
-
-static NTSTATUS gensec_gsskrb5_wrap(struct gensec_security *gensec_security,
- TALLOC_CTX *mem_ctx,
- const DATA_BLOB *in,
- DATA_BLOB *out)
-{
- struct gensec_gsskrb5_state *gensec_gsskrb5_state = gensec_security->private_data;
- OM_uint32 maj_stat, min_stat;
- gss_buffer_desc input_token, output_token;
- int conf_state;
- input_token.length = in->length;
- input_token.value = in->data;
-
- maj_stat = gss_wrap(&min_stat,
- gensec_gsskrb5_state->gssapi_context,
- gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL),
- GSS_C_QOP_DEFAULT,
- &input_token,
- &conf_state,
- &output_token);
- if (GSS_ERROR(maj_stat)) {
- return NT_STATUS_ACCESS_DENIED;
- }
- *out = data_blob_talloc(mem_ctx, output_token.value, output_token.length);
-
- gss_release_buffer(&min_stat, &output_token);
-
- if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)
- && !conf_state) {
- return NT_STATUS_ACCESS_DENIED;
- }
- return NT_STATUS_OK;
-}
-
-static NTSTATUS gensec_gsskrb5_unwrap(struct gensec_security *gensec_security,
- TALLOC_CTX *mem_ctx,
- const DATA_BLOB *in,
- DATA_BLOB *out)
-{
- struct gensec_gsskrb5_state *gensec_gsskrb5_state = gensec_security->private_data;
- OM_uint32 maj_stat, min_stat;
- gss_buffer_desc input_token, output_token;
- int conf_state;
- gss_qop_t qop_state;
- input_token.length = in->length;
- input_token.value = in->data;
-
- maj_stat = gss_unwrap(&min_stat,
- gensec_gsskrb5_state->gssapi_context,
- &input_token,
- &output_token,
- &conf_state,
- &qop_state);
- if (GSS_ERROR(maj_stat)) {
- return NT_STATUS_ACCESS_DENIED;
- }
- *out = data_blob_talloc(mem_ctx, output_token.value, output_token.length);
-
- gss_release_buffer(&min_stat, &output_token);
-
- if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)
- && !conf_state) {
- return NT_STATUS_ACCESS_DENIED;
- }
- return NT_STATUS_OK;
-}
-
-static size_t gensec_gsskrb5_sig_size(struct gensec_security *gensec_security)
-{
- /* not const but work for DCERPC packets and arcfour */
- return 45;
-}
-
-static NTSTATUS gensec_gsskrb5_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_gsskrb5_state *gensec_gsskrb5_state = gensec_security->private_data;
- OM_uint32 maj_stat, min_stat;
- gss_buffer_desc input_token, output_token;
- int conf_state;
- ssize_t sig_length = 0;
-
- input_token.length = length;
- input_token.value = data;
-
- maj_stat = gss_wrap(&min_stat,
- gensec_gsskrb5_state->gssapi_context,
- gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL),
- GSS_C_QOP_DEFAULT,
- &input_token,
- &conf_state,
- &output_token);
- if (GSS_ERROR(maj_stat)) {
- return NT_STATUS_ACCESS_DENIED;
- }
-
- if (output_token.length < length) {
- return NT_STATUS_INTERNAL_ERROR;
- }
-
- sig_length = 45;
-
- memcpy(data, ((uint8_t *)output_token.value) + sig_length, length);
- *sig = data_blob_talloc(mem_ctx, (uint8_t *)output_token.value, sig_length);
-
-DEBUG(0,("gensec_gsskrb5_seal_packet: siglen: %d inlen: %d, wrap_len: %d\n", sig->length, length, output_token.length - sig_length));
-dump_data(0,sig->data, sig->length);
-dump_data(0,data, length);
-dump_data(0,((uint8_t *)output_token.value) + sig_length, output_token.length - sig_length);
-
- gss_release_buffer(&min_stat, &output_token);
-
- if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)
- && !conf_state) {
- return NT_STATUS_ACCESS_DENIED;
- }
- return NT_STATUS_OK;
-}
-
-static NTSTATUS gensec_gsskrb5_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,
- const DATA_BLOB *sig)
-{
- struct gensec_gsskrb5_state *gensec_gsskrb5_state = gensec_security->private_data;
- OM_uint32 maj_stat, min_stat;
- gss_buffer_desc input_token, output_token;
- int conf_state;
- gss_qop_t qop_state;
- DATA_BLOB in;
-
-DEBUG(0,("gensec_gsskrb5_unseal_packet: siglen: %d\n", sig->length));
-dump_data(0,sig->data, sig->length);
-
- in = data_blob_talloc(mem_ctx, NULL, sig->length + length);
-
- memcpy(in.data, sig->data, sig->length);
- memcpy(in.data + sig->length, data, length);
-
- input_token.length = in.length;
- input_token.value = in.data;
-
- maj_stat = gss_unwrap(&min_stat,
- gensec_gsskrb5_state->gssapi_context,
- &input_token,
- &output_token,
- &conf_state,
- &qop_state);
- if (GSS_ERROR(maj_stat)) {
- return NT_STATUS_ACCESS_DENIED;
- }
-
- if (output_token.length != length) {
- return NT_STATUS_INTERNAL_ERROR;
- }
-
- memcpy(data, output_token.value, length);
-
- gss_release_buffer(&min_stat, &output_token);
-
- if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)
- && !conf_state) {
- return NT_STATUS_ACCESS_DENIED;
- }
- return NT_STATUS_OK;
-}
-
-static NTSTATUS gensec_gsskrb5_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_gsskrb5_state *gensec_gsskrb5_state = gensec_security->private_data;
- OM_uint32 maj_stat, min_stat;
- gss_buffer_desc input_token, output_token;
- int conf_state;
- ssize_t sig_length = 0;
-
- input_token.length = length;
- input_token.value = discard_const_p(uint8_t *, data);
-
- maj_stat = gss_wrap(&min_stat,
- gensec_gsskrb5_state->gssapi_context,
- 0,
- GSS_C_QOP_DEFAULT,
- &input_token,
- &conf_state,
- &output_token);
- if (GSS_ERROR(maj_stat)) {
- return NT_STATUS_ACCESS_DENIED;
- }
-
- if (output_token.length < length) {
- return NT_STATUS_INTERNAL_ERROR;
- }
-
- sig_length = 45;
-
- /*memcpy(data, ((uint8_t *)output_token.value) + sig_length, length);*/
- *sig = data_blob_talloc(mem_ctx, (uint8_t *)output_token.value, sig_length);
-
-DEBUG(0,("gensec_gsskrb5_sign_packet: siglen: %d\n", sig->length));
-dump_data(0,sig->data, sig->length);
-
- gss_release_buffer(&min_stat, &output_token);
-
- return NT_STATUS_OK;
-}
-
-static NTSTATUS gensec_gsskrb5_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_gsskrb5_state *gensec_gsskrb5_state = gensec_security->private_data;
- OM_uint32 maj_stat, min_stat;
- gss_buffer_desc input_token, output_token;
- int conf_state;
- gss_qop_t qop_state;
- DATA_BLOB in;
-
-DEBUG(0,("gensec_gsskrb5_check_packet: siglen: %d\n", sig->length));
-dump_data(0,sig->data, sig->length);
-
- in = data_blob_talloc(mem_ctx, NULL, sig->length + length);
-
- memcpy(in.data, sig->data, sig->length);
- memcpy(in.data + sig->length, data, length);
-
- input_token.length = in.length;
- input_token.value = in.data;
-
- maj_stat = gss_unwrap(&min_stat,
- gensec_gsskrb5_state->gssapi_context,
- &input_token,
- &output_token,
- &conf_state,
- &qop_state);
- if (GSS_ERROR(maj_stat)) {
- return NT_STATUS_ACCESS_DENIED;
- }
-
- if (output_token.length != length) {
- return NT_STATUS_INTERNAL_ERROR;
- }
-
- /*memcpy(data, output_token.value, length);*/
-
- gss_release_buffer(&min_stat, &output_token);
-
- return NT_STATUS_OK;
-}
-
-static BOOL gensec_gsskrb5_have_feature(struct gensec_security *gensec_security,
- uint32_t feature)
-{
- struct gensec_gsskrb5_state *gensec_gsskrb5_state = gensec_security->private_data;
- if (feature & GENSEC_FEATURE_SIGN) {
- return gensec_gsskrb5_state->got_flags & GSS_C_INTEG_FLAG;
- }
- if (feature & GENSEC_FEATURE_SEAL) {
- return gensec_gsskrb5_state->got_flags & GSS_C_CONF_FLAG;
- }
- return False;
-}
-
-static const struct gensec_security_ops gensec_gsskrb5_security_ops = {
- .name = "gsskrb5",
- .auth_type = DCERPC_AUTH_TYPE_KRB5,
- .oid = GENSEC_OID_KERBEROS5,
- .client_start = gensec_gsskrb5_client_start,
- .update = gensec_gsskrb5_update,
- .sig_size = gensec_gsskrb5_sig_size,
- .sign_packet = gensec_gsskrb5_sign_packet,
- .check_packet = gensec_gsskrb5_check_packet,
- .seal_packet = gensec_gsskrb5_seal_packet,
- .unseal_packet = gensec_gsskrb5_unseal_packet,
- .wrap = gensec_gsskrb5_wrap,
- .unwrap = gensec_gsskrb5_unwrap,
- .have_feature = gensec_gsskrb5_have_feature,
- .enabled = False
-};
-
-NTSTATUS gensec_gsskrb5_init(void)
-{
- NTSTATUS ret;
-
- ret = gensec_register(&gensec_gsskrb5_security_ops);
- if (!NT_STATUS_IS_OK(ret)) {
- DEBUG(0,("Failed to register '%s' gensec backend!\n",
- gensec_gsskrb5_security_ops.name));
- return ret;
- }
-
- return ret;
-}
git.samba.org / samba.git / commitdiff