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samba-mirror/source4/auth/gensec/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> 2004-2005
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 "auth/auth.h"
enum spnego_state_position {
SPNEGO_SERVER_START,
SPNEGO_CLIENT_START,
SPNEGO_SERVER_TARG,
SPNEGO_CLIENT_TARG,
SPNEGO_FALLBACK,
SPNEGO_DONE
};
struct spnego_state {
enum spnego_message_type expected_packet;
enum spnego_state_position state_position;
struct gensec_security *sub_sec_security;
BOOL no_response_expected;
const char *neg_oid;
};
static NTSTATUS gensec_spnego_client_start(struct gensec_security *gensec_security)
{
struct spnego_state *spnego_state;
spnego_state = talloc(gensec_security, 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->sub_sec_security = NULL;
spnego_state->no_response_expected = False;
gensec_security->private_data = spnego_state;
return NT_STATUS_OK;
}
static NTSTATUS gensec_spnego_server_start(struct gensec_security *gensec_security)
{
struct spnego_state *spnego_state;
spnego_state = talloc(gensec_security, struct spnego_state);
if (!spnego_state) {
return NT_STATUS_NO_MEMORY;
}
spnego_state->expected_packet = SPNEGO_NEG_TOKEN_INIT;
spnego_state->state_position = SPNEGO_SERVER_START;
spnego_state->sub_sec_security = NULL;
spnego_state->no_response_expected = False;
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,
const uint8_t *whole_pdu, size_t pdu_length,
const 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,
whole_pdu, pdu_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 uint8_t *whole_pdu, size_t pdu_length,
const 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_check_packet(spnego_state->sub_sec_security,
mem_ctx,
data, length,
whole_pdu, pdu_length,
sig);
}
static NTSTATUS gensec_spnego_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 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_seal_packet(spnego_state->sub_sec_security,
mem_ctx,
data, length,
whole_pdu, pdu_length,
sig);
}
static NTSTATUS gensec_spnego_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 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,
whole_pdu, pdu_length,
sig);
}
static NTSTATUS gensec_spnego_wrap(struct gensec_security *gensec_security,
TALLOC_CTX *mem_ctx,
const DATA_BLOB *in,
DATA_BLOB *out)
{
struct spnego_state *spnego_state = gensec_security->private_data;
if (spnego_state->state_position != SPNEGO_DONE
&& spnego_state->state_position != SPNEGO_FALLBACK) {
DEBUG(1, ("gensec_spnego_wrap: wrong state for wrap\n"));
return NT_STATUS_INVALID_PARAMETER;
}
return gensec_wrap(spnego_state->sub_sec_security,
mem_ctx, in, out);
}
static NTSTATUS gensec_spnego_unwrap(struct gensec_security *gensec_security,
TALLOC_CTX *mem_ctx,
const DATA_BLOB *in,
DATA_BLOB *out)
{
struct spnego_state *spnego_state = gensec_security->private_data;
if (spnego_state->state_position != SPNEGO_DONE
&& spnego_state->state_position != SPNEGO_FALLBACK) {
DEBUG(1, ("gensec_spnego_unwrap: wrong state for unwrap\n"));
return NT_STATUS_INVALID_PARAMETER;
}
return gensec_unwrap(spnego_state->sub_sec_security,
mem_ctx, in, out);
}
static size_t gensec_spnego_sig_size(struct gensec_security *gensec_security, size_t data_size)
{
struct spnego_state *spnego_state = gensec_security->private_data;
if (spnego_state->state_position != SPNEGO_DONE
&& spnego_state->state_position != SPNEGO_FALLBACK) {
return 0;
}
return gensec_sig_size(spnego_state->sub_sec_security, data_size);
}
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->sub_sec_security) {
return NT_STATUS_INVALID_PARAMETER;
}
return gensec_session_key(spnego_state->sub_sec_security,
session_key);
}
static NTSTATUS gensec_spnego_session_info(struct gensec_security *gensec_security,
struct auth_session_info **session_info)
{
struct spnego_state *spnego_state = gensec_security->private_data;
if (!spnego_state->sub_sec_security) {
return NT_STATUS_INVALID_PARAMETER;
}
return gensec_session_info(spnego_state->sub_sec_security,
session_info);
}
/** Fallback to another GENSEC mechanism, based on magic strings
*
* This is the 'fallback' case, where we don't get SPNEGO, and have to
* try all the other options (and hope they all have a magic string
* they check)
*/
static NTSTATUS gensec_spnego_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,j;
struct gensec_security_ops **all_ops
= gensec_security_mechs(gensec_security, out_mem_ctx);
for (i=0; all_ops[i]; i++) {
BOOL is_spnego;
NTSTATUS nt_status;
if (!all_ops[i]->oid) {
continue;
}
is_spnego = False;
for (j=0; all_ops[i]->oid[j]; j++) {
if (strcasecmp(GENSEC_OID_SPNEGO,all_ops[i]->oid[j]) == 0) {
is_spnego = True;
}
}
if (is_spnego) {
continue;
}
if (!all_ops[i]->magic) {
continue;
}
nt_status = all_ops[i]->magic(gensec_security, &in);
if (!NT_STATUS_IS_OK(nt_status)) {
continue;
}
spnego_state->state_position = SPNEGO_FALLBACK;
nt_status = gensec_subcontext_start(spnego_state,
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_ops(spnego_state->sub_sec_security,
all_ops[i]);
if (!NT_STATUS_IS_OK(nt_status)) {
return nt_status;
}
nt_status = gensec_update(spnego_state->sub_sec_security,
out_mem_ctx, in, out);
return nt_status;
}
DEBUG(1, ("Failed to parse SPNEGO request\n"));
return NT_STATUS_INVALID_PARAMETER;
}
/*
Parse the netTokenInit, either from the client, to the server, or
from the server to the client.
*/
static NTSTATUS gensec_spnego_parse_negTokenInit(struct gensec_security *gensec_security,
struct spnego_state *spnego_state,
TALLOC_CTX *out_mem_ctx,
const char **mechType,
const DATA_BLOB unwrapped_in, DATA_BLOB *unwrapped_out)
{
int i;
NTSTATUS nt_status = NT_STATUS_INVALID_PARAMETER;
DATA_BLOB null_data_blob = data_blob(NULL,0);
const struct gensec_security_ops_wrapper *all_sec
= gensec_security_by_oid_list(gensec_security,
out_mem_ctx,
mechType,
GENSEC_OID_SPNEGO);
if (spnego_state->state_position == SPNEGO_SERVER_START) {
for (i=0; all_sec && all_sec[i].op; i++) {
/* optomisitic token */
if (strcmp(all_sec[i].oid, mechType[0]) == 0) {
nt_status = gensec_subcontext_start(spnego_state,
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_ops(spnego_state->sub_sec_security,
all_sec[i].op);
if (!NT_STATUS_IS_OK(nt_status)) {
talloc_free(spnego_state->sub_sec_security);
spnego_state->sub_sec_security = NULL;
break;
}
nt_status = gensec_update(spnego_state->sub_sec_security,
out_mem_ctx,
unwrapped_in,
unwrapped_out);
if (NT_STATUS_EQUAL(nt_status, NT_STATUS_INVALID_PARAMETER) ||
NT_STATUS_EQUAL(nt_status, NT_STATUS_CANT_ACCESS_DOMAIN_INFO)) {
/* Pretend we never started it (lets the first run find some incompatible demand) */
DEBUG(1, ("SPNEGO(%s) NEG_TOKEN_INIT failed to parse: %s\n",
spnego_state->sub_sec_security->ops->name, nt_errstr(nt_status)));
talloc_free(spnego_state->sub_sec_security);
spnego_state->sub_sec_security = NULL;
break;
}
spnego_state->neg_oid = all_sec[i].oid;
break;
}
}
}
if (!spnego_state->sub_sec_security) {
for (i=0; all_sec && all_sec[i].op; i++) {
nt_status = gensec_subcontext_start(spnego_state,
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_ops(spnego_state->sub_sec_security,
all_sec[i].op);
if (!NT_STATUS_IS_OK(nt_status)) {
talloc_free(spnego_state->sub_sec_security);
spnego_state->sub_sec_security = NULL;
continue;
}
spnego_state->neg_oid = all_sec[i].oid;
/* 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);
break;
}
}
if (spnego_state->sub_sec_security) {
/* it is likely that a NULL input token will
* not be liked by most server mechs, but this
* does the right thing in the CIFS client.
* just push us along the merry-go-round
* again, and hope for better luck next
* time */
if (NT_STATUS_EQUAL(nt_status, NT_STATUS_INVALID_PARAMETER)) {
*unwrapped_out = data_blob(NULL, 0);
nt_status = NT_STATUS_MORE_PROCESSING_REQUIRED;
}
if (!NT_STATUS_EQUAL(nt_status, NT_STATUS_INVALID_PARAMETER)
&& !NT_STATUS_EQUAL(nt_status, NT_STATUS_MORE_PROCESSING_REQUIRED)
&& !NT_STATUS_IS_OK(nt_status)) {
DEBUG(1, ("SPNEGO(%s) NEG_TOKEN_INIT failed: %s\n",
spnego_state->sub_sec_security->ops->name, nt_errstr(nt_status)));
talloc_free(spnego_state->sub_sec_security);
spnego_state->sub_sec_security = NULL;
/* We started the mech correctly, and the
* input from the other side was valid.
* Return the error (say bad password, invalid
* ticket) */
return nt_status;
}
return nt_status; /* OK, INVALID_PARAMETER ore MORE PROCESSING */
}
DEBUG(1, ("SPNEGO: Could not find a suitable mechtype in NEG_TOKEN_INIT\n"));
/* we could re-negotiate here, but it would only work
* if the client or server lied about what it could
* support the first time. Lets keep this code to
* reality */
return NT_STATUS_INVALID_PARAMETER;
}
/** create a negTokenInit
*
* This is the same packet, no matter if the client or server sends it first, but it is always the first packet
*/
static NTSTATUS gensec_spnego_create_negTokenInit(struct gensec_security *gensec_security,
struct spnego_state *spnego_state,
TALLOC_CTX *out_mem_ctx,
const DATA_BLOB in, DATA_BLOB *out)
{
int i;
NTSTATUS nt_status = NT_STATUS_INVALID_PARAMETER;
DATA_BLOB null_data_blob = data_blob(NULL,0);
const char **mechTypes = NULL;
DATA_BLOB unwrapped_out = data_blob(NULL, 0);
const struct gensec_security_ops_wrapper *all_sec;
const char *principal = NULL;
mechTypes = gensec_security_oids(gensec_security,
out_mem_ctx, GENSEC_OID_SPNEGO);
all_sec = gensec_security_by_oid_list(gensec_security,
out_mem_ctx,
mechTypes,
GENSEC_OID_SPNEGO);
for (i=0; all_sec && all_sec[i].op; i++) {
struct spnego_data spnego_out;
nt_status = gensec_subcontext_start(spnego_state,
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_ops(spnego_state->sub_sec_security,
all_sec[i].op);
if (!NT_STATUS_IS_OK(nt_status)) {
talloc_free(spnego_state->sub_sec_security);
spnego_state->sub_sec_security = NULL;
continue;
}
/* In the client, try and produce the first (optimistic) packet */
if (spnego_state->state_position == SPNEGO_CLIENT_START) {
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)
&& !NT_STATUS_IS_OK(nt_status)) {
DEBUG(1, ("SPNEGO(%s) creating NEG_TOKEN_INIT failed: %s\n",
spnego_state->sub_sec_security->ops->name, nt_errstr(nt_status)));
talloc_free(spnego_state->sub_sec_security);
spnego_state->sub_sec_security = NULL;
/* Pretend we never started it (lets the first run find some incompatible demand) */
continue;
}
}
spnego_out.type = SPNEGO_NEG_TOKEN_INIT;
/* List the remaining mechs as options */
spnego_out.negTokenInit.mechTypes = gensec_security_oids_from_ops_wrapped(out_mem_ctx,
&all_sec[i]);
spnego_out.negTokenInit.reqFlags = 0;
if (spnego_state->state_position == SPNEGO_SERVER_START) {
/* server credentails */
struct cli_credentials *creds = gensec_get_credentials(gensec_security);
if (creds) {
principal = cli_credentials_get_principal(creds, out_mem_ctx);
}
}
if (principal) {
spnego_out.negTokenInit.mechListMIC
= data_blob_string_const(principal);
} else {
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 NEG_TOKEN_INIT\n"));
return NT_STATUS_INVALID_PARAMETER;
}
/* set next state */
spnego_state->neg_oid = all_sec[i].oid;
if (NT_STATUS_IS_OK(nt_status)) {
spnego_state->no_response_expected = True;
}
return NT_STATUS_MORE_PROCESSING_REQUIRED;
}
talloc_free(spnego_state->sub_sec_security);
spnego_state->sub_sec_security = NULL;
DEBUG(1, ("Failed to setup SPNEGO negTokenInit request: %s\n", nt_errstr(nt_status)));
return NT_STATUS_INVALID_PARAMETER;
}
/** create a server negTokenTarg
*
* This is the case, where the client is the first one who sends data
*/
static NTSTATUS gensec_spnego_server_negTokenTarg(struct gensec_security *gensec_security,
struct spnego_state *spnego_state,
TALLOC_CTX *out_mem_ctx,
NTSTATUS nt_status,
const DATA_BLOB unwrapped_out, DATA_BLOB *out)
{
struct spnego_data spnego_out;
DATA_BLOB null_data_blob = data_blob(NULL, 0);
/* compose reply */
spnego_out.type = SPNEGO_NEG_TOKEN_TARG;
spnego_out.negTokenTarg.responseToken = unwrapped_out;
spnego_out.negTokenTarg.mechListMIC = null_data_blob;
spnego_out.negTokenTarg.supportedMech = NULL;
if (NT_STATUS_EQUAL(nt_status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
spnego_out.negTokenTarg.supportedMech = spnego_state->neg_oid;
spnego_out.negTokenTarg.negResult = SPNEGO_ACCEPT_INCOMPLETE;
spnego_state->state_position = SPNEGO_SERVER_TARG;
} else if (NT_STATUS_IS_OK(nt_status)) {
if (unwrapped_out.data) {
spnego_out.negTokenTarg.supportedMech = spnego_state->neg_oid;
}
spnego_out.negTokenTarg.negResult = SPNEGO_ACCEPT_COMPLETED;
spnego_state->state_position = SPNEGO_DONE;
} else {
spnego_out.negTokenTarg.negResult = SPNEGO_REJECT;
DEBUG(2, ("SPNEGO login failed: %s\n", nt_errstr(nt_status)));
spnego_state->state_position = SPNEGO_DONE;
}
if (spnego_write_data(out_mem_ctx, out, &spnego_out) == -1) {
DEBUG(1, ("Failed to write SPNEGO reply to NEG_TOKEN_TARG\n"));
return NT_STATUS_INVALID_PARAMETER;
}
spnego_state->expected_packet = SPNEGO_NEG_TOKEN_TARG;
return nt_status;
}
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 = data_blob(NULL, 0);
struct spnego_data spnego_out;
struct spnego_data spnego;
ssize_t len;
*out = data_blob(NULL, 0);
if (!out_mem_ctx) {
out_mem_ctx = spnego_state;
}
/* 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:
{
NTSTATUS nt_status;
if (in.length) {
len = spnego_read_data(in, &spnego);
if (len == -1) {
return gensec_spnego_server_try_fallback(gensec_security, spnego_state,
out_mem_ctx, in, out);
}
/* client sent NegTargetInit, we send NegTokenTarg */
/* OK, so it's real SPNEGO, check the packet's the one we expect */
if (spnego.type != spnego_state->expected_packet) {
DEBUG(1, ("Invalid SPNEGO request: %d, expected %d\n", spnego.type,
spnego_state->expected_packet));
dump_data(1, in.data, in.length);
spnego_free_data(&spnego);
return NT_STATUS_INVALID_PARAMETER;
}
nt_status = gensec_spnego_parse_negTokenInit(gensec_security,
spnego_state,
out_mem_ctx,
spnego.negTokenInit.mechTypes,
spnego.negTokenInit.mechToken,
&unwrapped_out);
nt_status = gensec_spnego_server_negTokenTarg(gensec_security,
spnego_state,
out_mem_ctx,
nt_status,
unwrapped_out,
out);
spnego_free_data(&spnego);
return nt_status;
} else {
nt_status = gensec_spnego_create_negTokenInit(gensec_security, spnego_state,
out_mem_ctx, in, out);
spnego_state->state_position = SPNEGO_SERVER_START;
spnego_state->expected_packet = SPNEGO_NEG_TOKEN_INIT;
return nt_status;
}
}
case SPNEGO_CLIENT_START:
{
/* The server offers a list of mechanisms */
const char *my_mechs[] = {NULL, NULL};
NTSTATUS nt_status = NT_STATUS_INVALID_PARAMETER;
if (!in.length) {
/* client to produce negTokenInit */
nt_status = gensec_spnego_create_negTokenInit(gensec_security, spnego_state,
out_mem_ctx, in, out);
spnego_state->state_position = SPNEGO_CLIENT_TARG;
spnego_state->expected_packet = SPNEGO_NEG_TOKEN_TARG;
return nt_status;
}
len = spnego_read_data(in, &spnego);
if (len == -1) {
DEBUG(1, ("Invalid SPNEGO request:\n"));
dump_data(1, in.data, in.length);
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) {
DEBUG(1, ("Invalid SPNEGO request: %d, expected %d\n", spnego.type,
spnego_state->expected_packet));
dump_data(1, in.data, in.length);
spnego_free_data(&spnego);
return NT_STATUS_INVALID_PARAMETER;
}
if (spnego.negTokenInit.targetPrincipal) {
DEBUG(5, ("Server claims it's principal name is %s\n", spnego.negTokenInit.targetPrincipal));
gensec_set_target_principal(gensec_security, spnego.negTokenInit.targetPrincipal);
}
nt_status = gensec_spnego_parse_negTokenInit(gensec_security,
spnego_state,
out_mem_ctx,
spnego.negTokenInit.mechTypes,
spnego.negTokenInit.mechToken,
&unwrapped_out);
if (!NT_STATUS_EQUAL(nt_status, NT_STATUS_MORE_PROCESSING_REQUIRED) && !NT_STATUS_IS_OK(nt_status)) {
spnego_free_data(&spnego);
return nt_status;
}
my_mechs[0] = spnego_state->neg_oid;
/* compose reply */
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 SPNEGO 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;
if (NT_STATUS_IS_OK(nt_status)) {
spnego_state->no_response_expected = True;
}
spnego_free_data(&spnego);
return NT_STATUS_MORE_PROCESSING_REQUIRED;
}
case SPNEGO_SERVER_TARG:
{
NTSTATUS nt_status;
if (!in.length) {
return NT_STATUS_INVALID_PARAMETER;
}
len = spnego_read_data(in, &spnego);
if (len == -1) {
DEBUG(1, ("Invalid SPNEGO request:\n"));
dump_data(1, in.data, in.length);
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) {
DEBUG(1, ("Invalid SPNEGO request: %d, expected %d\n", spnego.type,
spnego_state->expected_packet));
dump_data(1, in.data, in.length);
spnego_free_data(&spnego);
return NT_STATUS_INVALID_PARAMETER;
}
if (!spnego_state->sub_sec_security) {
DEBUG(1, ("SPNEGO: Did not setup a mech in NEG_TOKEN_INIT\n"));
spnego_free_data(&spnego);
return NT_STATUS_INVALID_PARAMETER;
}
nt_status = gensec_update(spnego_state->sub_sec_security,
out_mem_ctx,
spnego.negTokenTarg.responseToken,
&unwrapped_out);
nt_status = gensec_spnego_server_negTokenTarg(gensec_security,
spnego_state,
out_mem_ctx,
nt_status,
unwrapped_out,
out);
spnego_free_data(&spnego);
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) {
DEBUG(1, ("Invalid SPNEGO request:\n"));
dump_data(1, in.data, in.length);
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) {
DEBUG(1, ("Invalid SPNEGO request: %d, expected %d\n", spnego.type,
spnego_state->expected_packet));
dump_data(1, in.data, in.length);
spnego_free_data(&spnego);
return NT_STATUS_INVALID_PARAMETER;
}
if (spnego.negTokenTarg.negResult == SPNEGO_REJECT) {
spnego_free_data(&spnego);
return NT_STATUS_ACCESS_DENIED;
}
/* Server didn't like our choice of mech, and chose something else */
if ((spnego.negTokenTarg.negResult == SPNEGO_ACCEPT_INCOMPLETE) &&
strcmp(spnego.negTokenTarg.supportedMech, spnego_state->neg_oid) != 0) {
DEBUG(3,("GENSEC SPNEGO: client preferred mech (%s) not accepted, server wants: %s\n",
gensec_get_name_by_oid(spnego.negTokenTarg.supportedMech),
gensec_get_name_by_oid(spnego_state->neg_oid)));
talloc_free(spnego_state->sub_sec_security);
nt_status = gensec_subcontext_start(spnego_state,
gensec_security,
&spnego_state->sub_sec_security);
if (!NT_STATUS_IS_OK(nt_status)) {
spnego_free_data(&spnego);
return nt_status;
}
/* select the sub context */
nt_status = gensec_start_mech_by_oid(spnego_state->sub_sec_security,
spnego.negTokenTarg.supportedMech);
if (!NT_STATUS_IS_OK(nt_status)) {
spnego_free_data(&spnego);
return nt_status;
}
nt_status = gensec_update(spnego_state->sub_sec_security,
out_mem_ctx,
spnego.negTokenTarg.responseToken,
&unwrapped_out);
spnego_state->neg_oid = talloc_strdup(spnego_state, spnego.negTokenTarg.supportedMech);
} else if (spnego_state->no_response_expected) {
if (spnego.negTokenTarg.negResult != SPNEGO_ACCEPT_COMPLETED) {
DEBUG(3,("GENSEC SPNEGO: client GENSEC accepted, but server rejected (bad password?)\n"));
nt_status = NT_STATUS_INVALID_PARAMETER;
} else if (spnego.negTokenTarg.responseToken.length) {
DEBUG(2,("GENSEC SPNEGO: client GENSEC accepted, but server continued negotiation!\n"));
nt_status = NT_STATUS_INVALID_PARAMETER;
} else {
nt_status = NT_STATUS_OK;
}
} else {
nt_status = gensec_update(spnego_state->sub_sec_security,
out_mem_ctx,
spnego.negTokenTarg.responseToken,
&unwrapped_out);
if (NT_STATUS_IS_OK(nt_status)) {
spnego_state->no_response_expected = True;
}
}
spnego_free_data(&spnego);
if (!NT_STATUS_EQUAL(nt_status, NT_STATUS_MORE_PROCESSING_REQUIRED)
&& !NT_STATUS_IS_OK(nt_status)) {
DEBUG(1, ("SPNEGO(%s) login failed: %s\n",
spnego_state->sub_sec_security->ops->name,
nt_errstr(nt_status)));
return nt_status;
}
if (unwrapped_out.length) {
/* 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 SPNEGO reply to NEG_TOKEN_TARG\n"));
return NT_STATUS_INVALID_PARAMETER;
}
spnego_state->state_position = SPNEGO_CLIENT_TARG;
nt_status = NT_STATUS_MORE_PROCESSING_REQUIRED;
} else {
/* all done - server has accepted, and we agree */
*out = null_data_blob;
if (spnego.negTokenTarg.negResult != SPNEGO_ACCEPT_COMPLETED) {
/* unless of course it did not accept */
DEBUG(1,("gensec_update ok but not accepted\n"));
nt_status = NT_STATUS_INVALID_PARAMETER;
}
spnego_state->state_position = SPNEGO_DONE;
}
return nt_status;
}
case SPNEGO_DONE:
/* We should not be called after we are 'done' */
return NT_STATUS_INVALID_PARAMETER;
}
return NT_STATUS_INVALID_PARAMETER;
}
static BOOL gensec_spnego_have_feature(struct gensec_security *gensec_security,
uint32_t feature)
{
struct spnego_state *spnego_state = gensec_security->private_data;
if (!spnego_state->sub_sec_security) {
return False;
}
return gensec_have_feature(spnego_state->sub_sec_security,
feature);
}
static const char *gensec_spnego_oids[] = {
GENSEC_OID_SPNEGO,
NULL
};
static const struct gensec_security_ops gensec_spnego_security_ops = {
.name = "spnego",
.sasl_name = "GSS-SPNEGO",
.auth_type = DCERPC_AUTH_TYPE_SPNEGO,
.oid = gensec_spnego_oids,
.client_start = gensec_spnego_client_start,
.server_start = gensec_spnego_server_start,
.update = gensec_spnego_update,
.seal_packet = gensec_spnego_seal_packet,
.sign_packet = gensec_spnego_sign_packet,
.sig_size = gensec_spnego_sig_size,
.check_packet = gensec_spnego_check_packet,
.unseal_packet = gensec_spnego_unseal_packet,
.wrap = gensec_spnego_wrap,
.unwrap = gensec_spnego_unwrap,
.session_key = gensec_spnego_session_key,
.session_info = gensec_spnego_session_info,
.have_feature = gensec_spnego_have_feature,
.enabled = True,
};
NTSTATUS gensec_spnego_init(void)
{
NTSTATUS ret;
ret = gensec_register(&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;
}