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samba-mirror/source4/libcli/auth/spnego.c

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/*
Unix SMB/CIFS implementation.
RFC2478 Compliant SPNEGO implementation
Copyright (C) Jim McDonough <jmcd@us.ibm.com> 2003
Copyright (C) Andrew Bartlett <abartlet@samba.org> 2004
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"
#undef DBGC_CLASS
#define DBGC_CLASS DBGC_AUTH
enum spnego_state_position {
SPNEGO_SERVER_START,
SPNEGO_CLIENT_START,
SPNEGO_SERVER_TARG,
SPNEGO_CLIENT_TARG,
SPNEGO_FALLBACK,
SPNEGO_DONE
};
struct spnego_state {
TALLOC_CTX *mem_ctx;
uint_t ref_count;
enum spnego_message_type expected_packet;
enum spnego_message_type state_position;
enum spnego_negResult result;
struct gensec_security *sub_sec_security;
};
static NTSTATUS gensec_spnego_client_start(struct gensec_security *gensec_security)
{
struct spnego_state *spnego_state;
TALLOC_CTX *mem_ctx = talloc_init("gensec_spengo_client_start");
if (!mem_ctx) {
return NT_STATUS_NO_MEMORY;
}
spnego_state = talloc_p(mem_ctx, struct spnego_state);
if (!spnego_state) {
return NT_STATUS_NO_MEMORY;
}
spnego_state->expected_packet = SPNEGO_NEG_TOKEN_INIT;
spnego_state->state_position = SPNEGO_CLIENT_START;
spnego_state->result = SPNEGO_ACCEPT_INCOMPLETE;
spnego_state->mem_ctx = mem_ctx;
spnego_state->sub_sec_security = NULL;
gensec_security->private_data = spnego_state;
return NT_STATUS_OK;
}
/*
wrappers for the spnego_*() functions
*/
static NTSTATUS gensec_spnego_unseal_packet(struct gensec_security *gensec_security,
TALLOC_CTX *mem_ctx,
uint8_t *data, size_t length, DATA_BLOB *sig)
{
struct spnego_state *spnego_state = gensec_security->private_data;
if (spnego_state->state_position != SPNEGO_DONE
&& spnego_state->state_position != SPNEGO_FALLBACK) {
return NT_STATUS_INVALID_PARAMETER;
}
return gensec_unseal_packet(spnego_state->sub_sec_security,
mem_ctx, data, length, sig);
}
static NTSTATUS gensec_spnego_check_packet(struct gensec_security *gensec_security,
TALLOC_CTX *mem_ctx,
const uint8_t *data, size_t length,
const DATA_BLOB *sig)
{
struct spnego_state *spnego_state = gensec_security->private_data;
return NT_STATUS_NOT_IMPLEMENTED;
if (spnego_state->state_position != SPNEGO_DONE
&& spnego_state->state_position != SPNEGO_FALLBACK) {
return NT_STATUS_INVALID_PARAMETER;
}
return gensec_check_packet(spnego_state->sub_sec_security,
mem_ctx, data, length, sig);
}
static NTSTATUS gensec_spnego_seal_packet(struct gensec_security *gensec_security,
TALLOC_CTX *mem_ctx,
uint8_t *data, size_t length,
DATA_BLOB *sig)
{
struct spnego_state *spnego_state = gensec_security->private_data;
return NT_STATUS_NOT_IMPLEMENTED;
if (spnego_state->state_position != SPNEGO_DONE
&& spnego_state->state_position != SPNEGO_FALLBACK) {
return NT_STATUS_INVALID_PARAMETER;
}
return gensec_seal_packet(spnego_state->sub_sec_security,
mem_ctx, data, length, sig);
}
static NTSTATUS gensec_spnego_sign_packet(struct gensec_security *gensec_security,
TALLOC_CTX *mem_ctx,
const uint8_t *data, size_t length,
DATA_BLOB *sig)
{
struct spnego_state *spnego_state = gensec_security->private_data;
if (spnego_state->state_position != SPNEGO_DONE
&& spnego_state->state_position != SPNEGO_FALLBACK) {
return NT_STATUS_INVALID_PARAMETER;
}
return gensec_sign_packet(spnego_state->sub_sec_security,
mem_ctx, data, length, sig);
}
static NTSTATUS gensec_spnego_session_key(struct gensec_security *gensec_security,
DATA_BLOB *session_key)
{
struct spnego_state *spnego_state = gensec_security->private_data;
if (spnego_state->state_position != SPNEGO_DONE
&& spnego_state->state_position != SPNEGO_FALLBACK) {
return NT_STATUS_INVALID_PARAMETER;
}
return gensec_session_key(spnego_state->sub_sec_security,
session_key);
}
/** Fallback to another GENSEC mechanism, based on magic strings
*
* This is the 'fallback' case, where we don't get SPENGO, and have to
* try all the other options (and hope they all have a magic string
* they check)
*/
static NTSTATUS gensec_spengo_server_try_fallback(struct gensec_security *gensec_security,
struct spnego_state *spnego_state,
TALLOC_CTX *out_mem_ctx,
const DATA_BLOB in, DATA_BLOB *out)
{
int i;
int num_ops;
const struct gensec_security_ops **all_ops = gensec_security_all(&num_ops);
for (i=0; i < num_ops; i++) {
NTSTATUS nt_status;
if (!all_ops[i]->oid) {
continue;
}
nt_status = gensec_subcontext_start(gensec_security,
&spnego_state->sub_sec_security);
if (!NT_STATUS_IS_OK(nt_status)) {
return nt_status;
}
/* select the sub context */
nt_status = gensec_start_mech_by_oid(spnego_state->sub_sec_security,
all_ops[i]->oid);
if (!NT_STATUS_IS_OK(nt_status)) {
gensec_end(&spnego_state->sub_sec_security);
continue;
}
nt_status = gensec_update(spnego_state->sub_sec_security,
out_mem_ctx, in, out);
if (NT_STATUS_EQUAL(nt_status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
spnego_state->state_position = SPNEGO_FALLBACK;
return nt_status;
}
gensec_end(&spnego_state->sub_sec_security);
}
DEBUG(1, ("Failed to parse SPENGO request\n"));
return NT_STATUS_INVALID_PARAMETER;
}
/** create a client netTokenInit
*
* This is the case, where the client is the first one who sends data
*/
static NTSTATUS gensec_spengo_client_netTokenInit(struct gensec_security *gensec_security,
struct spnego_state *spnego_state,
TALLOC_CTX *out_mem_ctx,
const DATA_BLOB in, DATA_BLOB *out)
{
NTSTATUS nt_status;
int i;
int num_ops;
char **mechTypes = NULL;
const struct gensec_security_ops **all_ops = gensec_security_all(&num_ops);
DATA_BLOB null_data_blob = data_blob(NULL,0);
DATA_BLOB unwrapped_out = data_blob(NULL,0);
if (num_ops < 1) {
DEBUG(1, ("no GENSEC backends available\n"));
return NT_STATUS_INVALID_PARAMETER;
}
/* build a mechTypes list we want to offer */
for (i=0; i < num_ops; i++) {
if (!all_ops[i]->oid) {
continue;
}
/* skip SPNEGO itself */
if (strcmp(OID_SPNEGO,all_ops[i]->oid)==0) {
continue;
}
mechTypes = talloc_realloc_p(out_mem_ctx, mechTypes, char *, i+2);
if (!mechTypes) {
DEBUG(1, ("talloc_realloc_p(out_mem_ctx, mechTypes, char *, i+1) failed\n"));
return NT_STATUS_NO_MEMORY;
}
mechTypes[i] = all_ops[i]->oid;
mechTypes[i+1] = NULL;
}
if (!mechTypes) {
DEBUG(1, ("no GENSEC OID backends available\n"));
return NT_STATUS_INVALID_PARAMETER;
}
nt_status = gensec_subcontext_start(gensec_security,
&spnego_state->sub_sec_security);
if (!NT_STATUS_IS_OK(nt_status)) {
return nt_status;
}
/* select our preferred mech */
nt_status = gensec_start_mech_by_oid(spnego_state->sub_sec_security,
mechTypes[0]);
if (!NT_STATUS_IS_OK(nt_status)) {
gensec_end(&spnego_state->sub_sec_security);
return nt_status;
}
nt_status = gensec_update(spnego_state->sub_sec_security,
out_mem_ctx, in, &unwrapped_out);
if (NT_STATUS_EQUAL(nt_status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
struct spnego_data spnego_out;
spnego_out.type = SPNEGO_NEG_TOKEN_INIT;
spnego_out.negTokenInit.mechTypes = mechTypes;
spnego_out.negTokenInit.reqFlags = 0;
spnego_out.negTokenInit.mechListMIC = null_data_blob;
spnego_out.negTokenInit.mechToken = unwrapped_out;
if (spnego_write_data(out_mem_ctx, out, &spnego_out) == -1) {
DEBUG(1, ("Failed to write SPENGO reply to NEG_TOKEN_INIT\n"));
return NT_STATUS_INVALID_PARAMETER;
}
/* set next state */
spnego_state->expected_packet = SPNEGO_NEG_TOKEN_TARG;
spnego_state->state_position = SPNEGO_CLIENT_TARG;
return nt_status;
}
gensec_end(&spnego_state->sub_sec_security);
DEBUG(1, ("Failed to setup SPENGO netTokenInit request\n"));
return NT_STATUS_INVALID_PARAMETER;
}
static NTSTATUS gensec_spnego_update(struct gensec_security *gensec_security, TALLOC_CTX *out_mem_ctx,
const DATA_BLOB in, DATA_BLOB *out)
{
struct spnego_state *spnego_state = gensec_security->private_data;
DATA_BLOB null_data_blob = data_blob(NULL, 0);
DATA_BLOB unwrapped_out;
struct spnego_data spnego_out;
struct spnego_data spnego;
ssize_t len;
if (!out_mem_ctx) {
out_mem_ctx = spnego_state->mem_ctx;
}
/* and switch into the state machine */
switch (spnego_state->state_position) {
case SPNEGO_FALLBACK:
return gensec_update(spnego_state->sub_sec_security,
out_mem_ctx, in, out);
case SPNEGO_SERVER_START:
{
if (in.length) {
len = spnego_read_data(in, &spnego);
if (len == -1) {
return gensec_spengo_server_try_fallback(gensec_security, spnego_state, out_mem_ctx, in, out);
} else {
/* client sent NegTargetInit */
}
} else {
/* server needs to send NegTargetInit */
}
}
case SPNEGO_CLIENT_START:
{
/* The server offers a list of mechanisms */
char **mechType;
char *my_mechs[] = {NULL, NULL};
int i;
NTSTATUS nt_status;
if (!in.length) {
/* client to produce negTokenInit */
return gensec_spengo_client_netTokenInit(gensec_security, spnego_state, out_mem_ctx, in, out);
}
len = spnego_read_data(in, &spnego);
if (len == -1) {
return NT_STATUS_INVALID_PARAMETER;
}
/* OK, so it's real SPNEGO, check the packet's the one we expect */
if (spnego.type != spnego_state->expected_packet) {
spnego_free_data(&spnego);
DEBUG(1, ("Invalid SPENGO request: %d, expected %d\n", spnego.type,
spnego_state->expected_packet));
return NT_STATUS_INVALID_PARAMETER;
}
mechType = spnego.negTokenInit.mechTypes;
for (i=0; mechType && mechType[i]; i++) {
nt_status = gensec_subcontext_start(gensec_security,
&spnego_state->sub_sec_security);
if (!NT_STATUS_IS_OK(nt_status)) {
break;
}
/* select the sub context */
nt_status = gensec_start_mech_by_oid(spnego_state->sub_sec_security,
mechType[i]);
if (!NT_STATUS_IS_OK(nt_status)) {
gensec_end(&spnego_state->sub_sec_security);
continue;
}
if (i == 0) {
nt_status = gensec_update(spnego_state->sub_sec_security,
out_mem_ctx,
spnego.negTokenInit.mechToken,
&unwrapped_out);
} else {
/* only get the helping start blob for the first OID */
nt_status = gensec_update(spnego_state->sub_sec_security,
out_mem_ctx,
null_data_blob,
&unwrapped_out);
}
if (!NT_STATUS_EQUAL(nt_status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
DEBUG(1, ("SPENGO(%s) NEG_TOKEN_INIT failed: %s\n",
spnego_state->sub_sec_security->ops->name, nt_errstr(nt_status)));
gensec_end(&spnego_state->sub_sec_security);
} else {
break;
}
}
if (!mechType || !mechType[i]) {
DEBUG(1, ("SPENGO: Could not find a suitable mechtype in NEG_TOKEN_INIT\n"));
}
spnego_free_data(&spnego);
if (!NT_STATUS_EQUAL(nt_status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
return nt_status;
}
/* compose reply */
my_mechs[0] = spnego_state->sub_sec_security->ops->oid;
spnego_out.type = SPNEGO_NEG_TOKEN_INIT;
spnego_out.negTokenInit.mechTypes = my_mechs;
spnego_out.negTokenInit.reqFlags = 0;
spnego_out.negTokenInit.mechListMIC = null_data_blob;
spnego_out.negTokenInit.mechToken = unwrapped_out;
if (spnego_write_data(out_mem_ctx, out, &spnego_out) == -1) {
DEBUG(1, ("Failed to write SPENGO reply to NEG_TOKEN_INIT\n"));
return NT_STATUS_INVALID_PARAMETER;
}
/* set next state */
spnego_state->expected_packet = SPNEGO_NEG_TOKEN_TARG;
spnego_state->state_position = SPNEGO_CLIENT_TARG;
return nt_status;
}
case SPNEGO_SERVER_TARG:
{
NTSTATUS nt_status;
if (!in.length) {
return NT_STATUS_INVALID_PARAMETER;
}
len = spnego_read_data(in, &spnego);
if (len == -1) {
return NT_STATUS_INVALID_PARAMETER;
}
/* OK, so it's real SPNEGO, check the packet's the one we expect */
if (spnego.type != spnego_state->expected_packet) {
spnego_free_data(&spnego);
DEBUG(1, ("Invalid SPENGO request: %d, expected %d\n", spnego.type,
spnego_state->expected_packet));
return NT_STATUS_INVALID_PARAMETER;
}
if (spnego.negTokenTarg.responseToken.length) {
nt_status = gensec_update(spnego_state->sub_sec_security,
out_mem_ctx,
spnego.negTokenTarg.responseToken,
&unwrapped_out);
} else {
unwrapped_out = data_blob(NULL, 0);
nt_status = NT_STATUS_OK;
}
spnego_state->result = spnego.negTokenTarg.negResult;
spnego_free_data(&spnego);
if (NT_STATUS_EQUAL(nt_status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
/* compose reply */
spnego_out.type = SPNEGO_NEG_TOKEN_TARG;
spnego_out.negTokenTarg.negResult = SPNEGO_ACCEPT_INCOMPLETE;
spnego_out.negTokenTarg.supportedMech
= spnego_state->sub_sec_security->ops->oid;
spnego_out.negTokenTarg.responseToken = unwrapped_out;
spnego_out.negTokenTarg.mechListMIC = null_data_blob;
if (spnego_write_data(out_mem_ctx, out, &spnego_out) == -1) {
DEBUG(1, ("Failed to write SPENGO reply to NEG_TOKEN_TARG\n"));
return NT_STATUS_INVALID_PARAMETER;
}
spnego_state->state_position = SPNEGO_SERVER_TARG;
} else if (NT_STATUS_IS_OK(nt_status)) {
spnego_state->state_position = SPNEGO_DONE;
} else {
DEBUG(1, ("SPENGO(%s) login failed: %s\n",
spnego_state->sub_sec_security->ops->name,
nt_errstr(nt_status)));
return nt_status;
}
return nt_status;
}
case SPNEGO_CLIENT_TARG:
{
NTSTATUS nt_status;
if (!in.length) {
return NT_STATUS_INVALID_PARAMETER;
}
len = spnego_read_data(in, &spnego);
if (len == -1) {
return NT_STATUS_INVALID_PARAMETER;
}
/* OK, so it's real SPNEGO, check the packet's the one we expect */
if (spnego.type != spnego_state->expected_packet) {
spnego_free_data(&spnego);
DEBUG(1, ("Invalid SPENGO request: %d, expected %d\n", spnego.type,
spnego_state->expected_packet));
return NT_STATUS_INVALID_PARAMETER;
}
if (spnego.negTokenTarg.negResult == SPNEGO_REJECT) {
return NT_STATUS_ACCESS_DENIED;
}
if (spnego.negTokenTarg.responseToken.length) {
nt_status = gensec_update(spnego_state->sub_sec_security,
out_mem_ctx,
spnego.negTokenTarg.responseToken,
&unwrapped_out);
} else {
unwrapped_out = data_blob(NULL, 0);
nt_status = NT_STATUS_OK;
}
if (NT_STATUS_IS_OK(nt_status)
&& (spnego.negTokenTarg.negResult != SPNEGO_ACCEPT_COMPLETED)) {
nt_status = NT_STATUS_INVALID_PARAMETER;
}
spnego_state->result = spnego.negTokenTarg.negResult;
spnego_free_data(&spnego);
if (NT_STATUS_EQUAL(nt_status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
/* compose reply */
spnego_out.type = SPNEGO_NEG_TOKEN_TARG;
spnego_out.negTokenTarg.negResult = SPNEGO_NONE_RESULT;
spnego_out.negTokenTarg.supportedMech = NULL;
spnego_out.negTokenTarg.responseToken = unwrapped_out;
spnego_out.negTokenTarg.mechListMIC = null_data_blob;
if (spnego_write_data(out_mem_ctx, out, &spnego_out) == -1) {
DEBUG(1, ("Failed to write SPENGO reply to NEG_TOKEN_TARG\n"));
return NT_STATUS_INVALID_PARAMETER;
}
spnego_state->state_position = SPNEGO_CLIENT_TARG;
} else if (NT_STATUS_IS_OK(nt_status)) {
spnego_state->state_position = SPNEGO_DONE;
} else {
DEBUG(1, ("SPENGO(%s) login failed: %s\n",
spnego_state->sub_sec_security->ops->name,
nt_errstr(nt_status)));
return nt_status;
}
return nt_status;
}
default:
spnego_free_data(&spnego);
DEBUG(1, ("Invalid SPENGO request: %d\n", spnego.type));
return NT_STATUS_INVALID_PARAMETER;
}
}
static void gensec_spnego_end(struct gensec_security *gensec_security)
{
struct spnego_state *spnego_state = gensec_security->private_data;
if (spnego_state->sub_sec_security) {
gensec_end(&spnego_state->sub_sec_security);
}
talloc_destroy(spnego_state->mem_ctx);
gensec_security->private_data = NULL;
}
static const struct gensec_security_ops gensec_spnego_security_ops = {
.name = "spnego",
.sasl_name = "GSS-SPNEGO",
.auth_type = DCERPC_AUTH_TYPE_SPNEGO,
.oid = OID_SPNEGO,
.client_start = gensec_spnego_client_start,
.update = gensec_spnego_update,
.seal_packet = gensec_spnego_seal_packet,
.sign_packet = gensec_spnego_sign_packet,
.check_packet = gensec_spnego_check_packet,
.unseal_packet = gensec_spnego_unseal_packet,
.session_key = gensec_spnego_session_key,
.end = gensec_spnego_end
};
NTSTATUS gensec_spengo_init(void)
{
NTSTATUS ret;
ret = register_backend("gensec", &gensec_spnego_security_ops);
if (!NT_STATUS_IS_OK(ret)) {
DEBUG(0,("Failed to register '%s' gensec backend!\n",
gensec_spnego_security_ops.name));
return ret;
}
return ret;
}