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|
/*
Unix SMB/CIFS implementation.
Kerberos backend for GENSEC
Copyright (C) Andrew Bartlett <abartlet@samba.org> 2004-2005
Copyright (C) Stefan Metzmacher <metze@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 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 "lib/events/events.h"
#include "system/kerberos.h"
#include "heimdal/lib/gssapi/gssapi/gssapi.h"
#include "auth/kerberos/kerberos.h"
#include "librpc/gen_ndr/krb5pac.h"
#include "auth/auth.h"
#include "lib/ldb/include/ldb.h"
#include "auth/auth_sam.h"
#include "librpc/rpc/dcerpc.h"
#include "auth/credentials/credentials.h"
#include "auth/credentials/credentials_krb5.h"
#include "auth/gensec/gensec.h"
#include "param/param.h"
enum gensec_gssapi_sasl_state
{
STAGE_GSS_NEG,
STAGE_SASL_SSF_NEG,
STAGE_SASL_SSF_ACCEPT,
STAGE_DONE
};
#define NEG_SEAL 0x4
#define NEG_SIGN 0x2
#define NEG_NONE 0x1
struct gensec_gssapi_state {
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;
gss_OID gss_oid;
DATA_BLOB session_key;
DATA_BLOB pac;
struct smb_krb5_context *smb_krb5_context;
struct gssapi_creds_container *client_cred;
struct gssapi_creds_container *server_cred;
gss_cred_id_t delegated_cred_handle;
bool sasl; /* We have two different mechs in this file: One
* for SASL wrapped GSSAPI and another for normal
* GSSAPI */
enum gensec_gssapi_sasl_state sasl_state;
uint8_t sasl_protection; /* What was negotiated at the SASL
* layer, independent of the GSSAPI
* layer... */
size_t max_wrap_buf_size;
int gss_exchange_count;
};
static size_t gensec_gssapi_max_input_size(struct gensec_security *gensec_security);
static size_t gensec_gssapi_max_wrapped_size(struct gensec_security *gensec_security);
static char *gssapi_error_string(TALLOC_CTX *mem_ctx,
OM_uint32 maj_stat, OM_uint32 min_stat,
const gss_OID mech)
{
OM_uint32 disp_min_stat, disp_maj_stat;
gss_buffer_desc maj_error_message;
gss_buffer_desc min_error_message;
char *maj_error_string, *min_error_string;
OM_uint32 msg_ctx = 0;
char *ret;
maj_error_message.value = NULL;
min_error_message.value = NULL;
maj_error_message.length = 0;
min_error_message.length = 0;
disp_maj_stat = gss_display_status(&disp_min_stat, maj_stat, GSS_C_GSS_CODE,
mech, &msg_ctx, &maj_error_message);
disp_maj_stat = gss_display_status(&disp_min_stat, min_stat, GSS_C_MECH_CODE,
mech, &msg_ctx, &min_error_message);
maj_error_string = talloc_strndup(mem_ctx, (char *)maj_error_message.value, maj_error_message.length);
min_error_string = talloc_strndup(mem_ctx, (char *)min_error_message.value, min_error_message.length);
ret = talloc_asprintf(mem_ctx, "%s: %s", maj_error_string, min_error_string);
talloc_free(maj_error_string);
talloc_free(min_error_string);
gss_release_buffer(&disp_min_stat, &maj_error_message);
gss_release_buffer(&disp_min_stat, &min_error_message);
return ret;
}
static int gensec_gssapi_destructor(struct gensec_gssapi_state *gensec_gssapi_state)
{
OM_uint32 maj_stat, min_stat;
if (gensec_gssapi_state->delegated_cred_handle != GSS_C_NO_CREDENTIAL) {
maj_stat = gss_release_cred(&min_stat,
&gensec_gssapi_state->delegated_cred_handle);
}
if (gensec_gssapi_state->gssapi_context != GSS_C_NO_CONTEXT) {
maj_stat = gss_delete_sec_context (&min_stat,
&gensec_gssapi_state->gssapi_context,
GSS_C_NO_BUFFER);
}
if (gensec_gssapi_state->server_name != GSS_C_NO_NAME) {
maj_stat = gss_release_name(&min_stat, &gensec_gssapi_state->server_name);
}
if (gensec_gssapi_state->client_name != GSS_C_NO_NAME) {
maj_stat = gss_release_name(&min_stat, &gensec_gssapi_state->client_name);
}
return 0;
}
static NTSTATUS gensec_gssapi_start(struct gensec_security *gensec_security)
{
struct gensec_gssapi_state *gensec_gssapi_state;
krb5_error_code ret;
struct gsskrb5_send_to_kdc send_to_kdc;
gensec_gssapi_state = talloc(gensec_security, struct gensec_gssapi_state);
if (!gensec_gssapi_state) {
return NT_STATUS_NO_MEMORY;
}
gensec_gssapi_state->gss_exchange_count = 0;
gensec_gssapi_state->max_wrap_buf_size
= lp_parm_int(gensec_security->lp_ctx, NULL, "gensec_gssapi", "max wrap buf size", 65536);
gensec_gssapi_state->sasl = false;
gensec_gssapi_state->sasl_state = STAGE_GSS_NEG;
gensec_security->private_data = gensec_gssapi_state;
gensec_gssapi_state->gssapi_context = GSS_C_NO_CONTEXT;
gensec_gssapi_state->server_name = GSS_C_NO_NAME;
gensec_gssapi_state->client_name = GSS_C_NO_NAME;
/* TODO: Fill in channel bindings */
gensec_gssapi_state->input_chan_bindings = GSS_C_NO_CHANNEL_BINDINGS;
gensec_gssapi_state->want_flags = 0;
if (lp_parm_bool(gensec_security->lp_ctx, NULL, "gensec_gssapi", "mutual", true)) {
gensec_gssapi_state->want_flags |= GSS_C_MUTUAL_FLAG;
}
if (lp_parm_bool(gensec_security->lp_ctx, NULL, "gensec_gssapi", "delegation", true)) {
gensec_gssapi_state->want_flags |= GSS_C_DELEG_FLAG;
}
if (lp_parm_bool(gensec_security->lp_ctx, NULL, "gensec_gssapi", "replay", true)) {
gensec_gssapi_state->want_flags |= GSS_C_REPLAY_FLAG;
}
if (lp_parm_bool(gensec_security->lp_ctx, NULL, "gensec_gssapi", "sequence", true)) {
gensec_gssapi_state->want_flags |= GSS_C_SEQUENCE_FLAG;
}
gensec_gssapi_state->got_flags = 0;
gensec_gssapi_state->session_key = data_blob(NULL, 0);
gensec_gssapi_state->pac = data_blob(NULL, 0);
gensec_gssapi_state->delegated_cred_handle = GSS_C_NO_CREDENTIAL;
talloc_set_destructor(gensec_gssapi_state, gensec_gssapi_destructor);
if (gensec_security->want_features & GENSEC_FEATURE_SIGN) {
gensec_gssapi_state->want_flags |= GSS_C_INTEG_FLAG;
}
if (gensec_security->want_features & GENSEC_FEATURE_SEAL) {
gensec_gssapi_state->want_flags |= GSS_C_CONF_FLAG;
}
if (gensec_security->want_features & GENSEC_FEATURE_DCE_STYLE) {
gensec_gssapi_state->want_flags |= GSS_C_DCE_STYLE;
}
gensec_gssapi_state->gss_oid = GSS_C_NULL_OID;
send_to_kdc.func = smb_krb5_send_and_recv_func;
send_to_kdc.ptr = gensec_security->event_ctx;
ret = gsskrb5_set_send_to_kdc(&send_to_kdc);
if (ret) {
DEBUG(1,("gensec_krb5_start: gsskrb5_set_send_to_kdc failed\n"));
talloc_free(gensec_gssapi_state);
return NT_STATUS_INTERNAL_ERROR;
}
if (lp_realm(gensec_security->lp_ctx) && *lp_realm(gensec_security->lp_ctx)) {
char *upper_realm = strupper_talloc(gensec_gssapi_state, lp_realm(gensec_security->lp_ctx));
if (!upper_realm) {
DEBUG(1,("gensec_krb5_start: could not uppercase realm: %s\n", lp_realm(gensec_security->lp_ctx)));
talloc_free(gensec_gssapi_state);
return NT_STATUS_NO_MEMORY;
}
ret = gsskrb5_set_default_realm(upper_realm);
talloc_free(upper_realm);
if (ret) {
DEBUG(1,("gensec_krb5_start: gsskrb5_set_default_realm failed\n"));
talloc_free(gensec_gssapi_state);
return NT_STATUS_INTERNAL_ERROR;
}
}
/* don't do DNS lookups of any kind, it might/will fail for a netbios name */
ret = gsskrb5_set_dns_canonicalize(lp_parm_bool(gensec_security->lp_ctx, NULL, "krb5", "set_dns_canonicalize", false));
if (ret) {
DEBUG(1,("gensec_krb5_start: gsskrb5_set_dns_canonicalize failed\n"));
talloc_free(gensec_gssapi_state);
return NT_STATUS_INTERNAL_ERROR;
}
ret = smb_krb5_init_context(gensec_gssapi_state,
gensec_security->event_ctx,
gensec_security->lp_ctx,
&gensec_gssapi_state->smb_krb5_context);
if (ret) {
DEBUG(1,("gensec_krb5_start: krb5_init_context failed (%s)\n",
error_message(ret)));
talloc_free(gensec_gssapi_state);
return NT_STATUS_INTERNAL_ERROR;
}
return NT_STATUS_OK;
}
static NTSTATUS gensec_gssapi_server_start(struct gensec_security *gensec_security)
{
NTSTATUS nt_status;
int ret;
struct gensec_gssapi_state *gensec_gssapi_state;
struct cli_credentials *machine_account;
struct gssapi_creds_container *gcc;
nt_status = gensec_gssapi_start(gensec_security);
if (!NT_STATUS_IS_OK(nt_status)) {
return nt_status;
}
gensec_gssapi_state = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
machine_account = gensec_get_credentials(gensec_security);
if (!machine_account) {
DEBUG(3, ("No machine account credentials specified\n"));
return NT_STATUS_CANT_ACCESS_DOMAIN_INFO;
} else {
ret = cli_credentials_get_server_gss_creds(machine_account, &gcc);
if (ret) {
DEBUG(1, ("Aquiring acceptor credentials failed: %s\n",
error_message(ret)));
return NT_STATUS_CANT_ACCESS_DOMAIN_INFO;
}
}
gensec_gssapi_state->server_cred = gcc;
return NT_STATUS_OK;
}
static NTSTATUS gensec_gssapi_sasl_server_start(struct gensec_security *gensec_security)
{
NTSTATUS nt_status;
struct gensec_gssapi_state *gensec_gssapi_state;
nt_status = gensec_gssapi_server_start(gensec_security);
if (NT_STATUS_IS_OK(nt_status)) {
gensec_gssapi_state = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
gensec_gssapi_state->sasl = true;
}
return nt_status;
}
static NTSTATUS gensec_gssapi_client_start(struct gensec_security *gensec_security)
{
struct gensec_gssapi_state *gensec_gssapi_state;
struct cli_credentials *creds = gensec_get_credentials(gensec_security);
krb5_error_code ret;
NTSTATUS nt_status;
gss_buffer_desc name_token;
gss_OID name_type;
OM_uint32 maj_stat, min_stat;
const char *hostname = gensec_get_target_hostname(gensec_security);
const char *principal;
struct gssapi_creds_container *gcc;
if (!hostname) {
DEBUG(1, ("Could not determine hostname for target computer, cannot use kerberos\n"));
return NT_STATUS_INVALID_PARAMETER;
}
if (is_ipaddress(hostname)) {
DEBUG(2, ("Cannot do GSSAPI to an IP address\n"));
return NT_STATUS_INVALID_PARAMETER;
}
if (strcmp(hostname, "localhost") == 0) {
DEBUG(2, ("GSSAPI to 'localhost' does not make sense\n"));
return NT_STATUS_INVALID_PARAMETER;
}
nt_status = gensec_gssapi_start(gensec_security);
if (!NT_STATUS_IS_OK(nt_status)) {
return nt_status;
}
gensec_gssapi_state = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
gensec_gssapi_state->gss_oid = gss_mech_krb5;
principal = gensec_get_target_principal(gensec_security);
if (principal && lp_client_use_spnego_principal(gensec_security->lp_ctx)) {
name_type = GSS_C_NULL_OID;
} else {
principal = talloc_asprintf(gensec_gssapi_state, "%s@%s",
gensec_get_target_service(gensec_security),
hostname);
name_type = GSS_C_NT_HOSTBASED_SERVICE;
}
name_token.value = discard_const_p(uint8_t, principal);
name_token.length = strlen(principal);
maj_stat = gss_import_name (&min_stat,
&name_token,
name_type,
&gensec_gssapi_state->server_name);
if (maj_stat) {
DEBUG(2, ("GSS Import name of %s failed: %s\n",
(char *)name_token.value,
gssapi_error_string(gensec_gssapi_state, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
return NT_STATUS_INVALID_PARAMETER;
}
ret = cli_credentials_get_client_gss_creds(creds, &gcc);
switch (ret) {
case 0:
break;
case KRB5KDC_ERR_PREAUTH_FAILED:
return NT_STATUS_LOGON_FAILURE;
case KRB5_KDC_UNREACH:
DEBUG(3, ("Cannot reach a KDC we require to contact %s\n", principal));
return NT_STATUS_INVALID_PARAMETER; /* Make SPNEGO ignore us, we can't go any further here */
default:
DEBUG(1, ("Aquiring initiator credentials failed\n"));
return NT_STATUS_UNSUCCESSFUL;
}
gensec_gssapi_state->client_cred = gcc;
if (!talloc_reference(gensec_gssapi_state, gcc)) {
return NT_STATUS_NO_MEMORY;
}
return NT_STATUS_OK;
}
static NTSTATUS gensec_gssapi_sasl_client_start(struct gensec_security *gensec_security)
{
NTSTATUS nt_status;
struct gensec_gssapi_state *gensec_gssapi_state;
nt_status = gensec_gssapi_client_start(gensec_security);
if (NT_STATUS_IS_OK(nt_status)) {
gensec_gssapi_state = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
gensec_gssapi_state->sasl = true;
}
return nt_status;
}
/**
* Check if the packet is one for this mechansim
*
* @param gensec_security GENSEC state
* @param in The request, as a DATA_BLOB
* @return Error, INVALID_PARAMETER if it's not a packet for us
* or NT_STATUS_OK if the packet is ok.
*/
static NTSTATUS gensec_gssapi_magic(struct gensec_security *gensec_security,
const DATA_BLOB *in)
{
if (gensec_gssapi_check_oid(in, GENSEC_OID_KERBEROS5)) {
return NT_STATUS_OK;
} else {
return NT_STATUS_INVALID_PARAMETER;
}
}
/**
* Next state function for the GSSAPI GENSEC mechanism
*
* @param gensec_gssapi_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_gssapi_update(struct gensec_security *gensec_security,
TALLOC_CTX *out_mem_ctx,
const DATA_BLOB in, DATA_BLOB *out)
{
struct gensec_gssapi_state *gensec_gssapi_state
= talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
NTSTATUS nt_status = NT_STATUS_LOGON_FAILURE;
OM_uint32 maj_stat, min_stat;
OM_uint32 min_stat2;
gss_buffer_desc input_token, output_token;
gss_OID gss_oid_p = NULL;
input_token.length = in.length;
input_token.value = in.data;
switch (gensec_gssapi_state->sasl_state) {
case STAGE_GSS_NEG:
{
switch (gensec_security->gensec_role) {
case GENSEC_CLIENT:
{
maj_stat = gss_init_sec_context(&min_stat,
gensec_gssapi_state->client_cred->creds,
&gensec_gssapi_state->gssapi_context,
gensec_gssapi_state->server_name,
gensec_gssapi_state->gss_oid,
gensec_gssapi_state->want_flags,
0,
gensec_gssapi_state->input_chan_bindings,
&input_token,
&gss_oid_p,
&output_token,
&gensec_gssapi_state->got_flags, /* ret flags */
NULL);
if (gss_oid_p) {
gensec_gssapi_state->gss_oid = gss_oid_p;
}
break;
}
case GENSEC_SERVER:
{
maj_stat = gss_accept_sec_context(&min_stat,
&gensec_gssapi_state->gssapi_context,
gensec_gssapi_state->server_cred->creds,
&input_token,
gensec_gssapi_state->input_chan_bindings,
&gensec_gssapi_state->client_name,
&gss_oid_p,
&output_token,
&gensec_gssapi_state->got_flags,
NULL,
&gensec_gssapi_state->delegated_cred_handle);
if (gss_oid_p) {
gensec_gssapi_state->gss_oid = gss_oid_p;
}
break;
}
default:
return NT_STATUS_INVALID_PARAMETER;
}
gensec_gssapi_state->gss_exchange_count++;
if (maj_stat == GSS_S_COMPLETE) {
*out = data_blob_talloc(out_mem_ctx, output_token.value, output_token.length);
gss_release_buffer(&min_stat2, &output_token);
if (gensec_gssapi_state->got_flags & GSS_C_DELEG_FLAG) {
DEBUG(5, ("gensec_gssapi: credentials were delegated\n"));
} else {
DEBUG(5, ("gensec_gssapi: NO credentials were delegated\n"));
}
/* We may have been invoked as SASL, so there
* is more work to do */
if (gensec_gssapi_state->sasl) {
/* Due to a very subtle interaction
* with SASL and the LDAP libs, we
* must ensure the data pointer is
* != NULL, but the length is 0.
*
* This ensures we send a 'zero
* length' (rather than NULL) response
*/
if (!out->data) {
out->data = (uint8_t *)talloc_strdup(out_mem_ctx, "\0");
}
gensec_gssapi_state->sasl_state = STAGE_SASL_SSF_NEG;
return NT_STATUS_MORE_PROCESSING_REQUIRED;
} else {
gensec_gssapi_state->sasl_state = STAGE_DONE;
if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)) {
DEBUG(5, ("GSSAPI Connection will be cryptographicly sealed\n"));
} else if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SIGN)) {
DEBUG(5, ("GSSAPI Connection will be cryptographicly signed\n"));
} else {
DEBUG(5, ("GSSAPI Connection will have no cryptographic protection\n"));
}
return NT_STATUS_OK;
}
} else if (maj_stat == GSS_S_CONTINUE_NEEDED) {
*out = data_blob_talloc(out_mem_ctx, output_token.value, output_token.length);
gss_release_buffer(&min_stat2, &output_token);
return NT_STATUS_MORE_PROCESSING_REQUIRED;
} else if (gss_oid_equal(gensec_gssapi_state->gss_oid, gss_mech_krb5)) {
switch (min_stat) {
case KRB5_KDC_UNREACH:
DEBUG(3, ("Cannot reach a KDC we require: %s\n",
gssapi_error_string(gensec_gssapi_state, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
return NT_STATUS_INVALID_PARAMETER; /* Make SPNEGO ignore us, we can't go any further here */
case KRB5KDC_ERR_S_PRINCIPAL_UNKNOWN:
DEBUG(3, ("Server is not registered with our KDC: %s\n",
gssapi_error_string(gensec_gssapi_state, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
return NT_STATUS_INVALID_PARAMETER; /* Make SPNEGO ignore us, we can't go any further here */
case KRB5KRB_AP_ERR_MSG_TYPE:
/* garbage input, possibly from the auto-mech detection */
return NT_STATUS_INVALID_PARAMETER;
default:
DEBUG(1, ("GSS Update(krb5)(%d) Update failed: %s\n",
gensec_gssapi_state->gss_exchange_count,
gssapi_error_string(out_mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
return nt_status;
}
} else {
DEBUG(1, ("GSS Update(%d) failed: %s\n",
gensec_gssapi_state->gss_exchange_count,
gssapi_error_string(out_mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
return nt_status;
}
break;
}
/* These last two stages are only done if we were invoked as SASL */
case STAGE_SASL_SSF_NEG:
{
switch (gensec_security->gensec_role) {
case GENSEC_CLIENT:
{
uint8_t maxlength_proposed[4];
uint8_t maxlength_accepted[4];
uint8_t security_supported;
int conf_state;
gss_qop_t qop_state;
input_token.length = in.length;
input_token.value = in.data;
/* As a client, we have just send a
* zero-length blob to the server (after the
* normal GSSAPI exchange), and it has replied
* with it's SASL negotiation */
maj_stat = gss_unwrap(&min_stat,
gensec_gssapi_state->gssapi_context,
&input_token,
&output_token,
&conf_state,
&qop_state);
if (GSS_ERROR(maj_stat)) {
DEBUG(1, ("gensec_gssapi_update: GSS UnWrap of SASL protection negotiation failed: %s\n",
gssapi_error_string(out_mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
return NT_STATUS_ACCESS_DENIED;
}
if (output_token.length < 4) {
return NT_STATUS_INVALID_PARAMETER;
}
memcpy(maxlength_proposed, output_token.value, 4);
gss_release_buffer(&min_stat, &output_token);
/* first byte is the proposed security */
security_supported = maxlength_proposed[0];
maxlength_proposed[0] = '\0';
/* Rest is the proposed max wrap length */
gensec_gssapi_state->max_wrap_buf_size = MIN(RIVAL(maxlength_proposed, 0),
gensec_gssapi_state->max_wrap_buf_size);
gensec_gssapi_state->sasl_protection = 0;
if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)) {
if (security_supported & NEG_SEAL) {
gensec_gssapi_state->sasl_protection |= NEG_SEAL;
}
} else if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SIGN)) {
if (security_supported & NEG_SIGN) {
gensec_gssapi_state->sasl_protection |= NEG_SIGN;
}
} else if (security_supported & NEG_NONE) {
gensec_gssapi_state->sasl_protection |= NEG_NONE;
} else {
DEBUG(1, ("Remote server does not support unprotected connections"));
return NT_STATUS_ACCESS_DENIED;
}
/* Send back the negotiated max length */
RSIVAL(maxlength_accepted, 0, gensec_gssapi_state->max_wrap_buf_size);
maxlength_accepted[0] = gensec_gssapi_state->sasl_protection;
input_token.value = maxlength_accepted;
input_token.length = sizeof(maxlength_accepted);
maj_stat = gss_wrap(&min_stat,
gensec_gssapi_state->gssapi_context,
false,
GSS_C_QOP_DEFAULT,
&input_token,
&conf_state,
&output_token);
if (GSS_ERROR(maj_stat)) {
DEBUG(1, ("GSS Update(SSF_NEG): GSS Wrap failed: %s\n",
gssapi_error_string(out_mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
return NT_STATUS_ACCESS_DENIED;
}
*out = data_blob_talloc(out_mem_ctx, output_token.value, output_token.length);
gss_release_buffer(&min_stat, &output_token);
/* quirk: This changes the value that gensec_have_feature returns, to be that after SASL negotiation */
gensec_gssapi_state->sasl_state = STAGE_DONE;
if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)) {
DEBUG(3, ("SASL/GSSAPI Connection to server will be cryptographicly sealed\n"));
} else if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SIGN)) {
DEBUG(3, ("SASL/GSSAPI Connection to server will be cryptographicly signed\n"));
} else {
DEBUG(3, ("SASL/GSSAPI Connection to server will have no cryptographicly protection\n"));
}
return NT_STATUS_OK;
}
case GENSEC_SERVER:
{
uint8_t maxlength_proposed[4];
uint8_t security_supported = 0x0;
int conf_state;
/* As a server, we have just been sent a zero-length blob (note this, but it isn't fatal) */
if (in.length != 0) {
DEBUG(1, ("SASL/GSSAPI: client sent non-zero length starting SASL negotiation!\n"));
}
/* Give the client some idea what we will support */
RSIVAL(maxlength_proposed, 0, gensec_gssapi_state->max_wrap_buf_size);
/* first byte is the proposed security */
maxlength_proposed[0] = '\0';
gensec_gssapi_state->sasl_protection = 0;
if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)) {
security_supported |= NEG_SEAL;
}
if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SIGN)) {
security_supported |= NEG_SIGN;
}
if (security_supported == 0) {
/* If we don't support anything, this must be 0 */
RSIVAL(maxlength_proposed, 0, 0x0);
}
/* TODO: We may not wish to support this */
security_supported |= NEG_NONE;
maxlength_proposed[0] = security_supported;
input_token.value = maxlength_proposed;
input_token.length = sizeof(maxlength_proposed);
maj_stat = gss_wrap(&min_stat,
gensec_gssapi_state->gssapi_context,
false,
GSS_C_QOP_DEFAULT,
&input_token,
&conf_state,
&output_token);
if (GSS_ERROR(maj_stat)) {
DEBUG(1, ("GSS Update(SSF_NEG): GSS Wrap failed: %s\n",
gssapi_error_string(out_mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
return NT_STATUS_ACCESS_DENIED;
}
*out = data_blob_talloc(out_mem_ctx, output_token.value, output_token.length);
gss_release_buffer(&min_stat, &output_token);
gensec_gssapi_state->sasl_state = STAGE_SASL_SSF_ACCEPT;
return NT_STATUS_MORE_PROCESSING_REQUIRED;
}
default:
return NT_STATUS_INVALID_PARAMETER;
}
}
/* This is s server-only stage */
case STAGE_SASL_SSF_ACCEPT:
{
uint8_t maxlength_accepted[4];
uint8_t security_accepted;
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_gssapi_state->gssapi_context,
&input_token,
&output_token,
&conf_state,
&qop_state);
if (GSS_ERROR(maj_stat)) {
DEBUG(1, ("gensec_gssapi_update: GSS UnWrap of SASL protection negotiation failed: %s\n",
gssapi_error_string(out_mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
return NT_STATUS_ACCESS_DENIED;
}
if (output_token.length < 4) {
return NT_STATUS_INVALID_PARAMETER;
}
memcpy(maxlength_accepted, output_token.value, 4);
gss_release_buffer(&min_stat, &output_token);
/* first byte is the proposed security */
security_accepted = maxlength_accepted[0];
maxlength_accepted[0] = '\0';
/* Rest is the proposed max wrap length */
gensec_gssapi_state->max_wrap_buf_size = MIN(RIVAL(maxlength_accepted, 0),
gensec_gssapi_state->max_wrap_buf_size);
gensec_gssapi_state->sasl_protection = 0;
if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)) {
if (security_accepted & NEG_SEAL) {
gensec_gssapi_state->sasl_protection |= NEG_SEAL;
}
} else if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SIGN)) {
if (security_accepted & NEG_SIGN) {
gensec_gssapi_state->sasl_protection |= NEG_SIGN;
}
} else if (security_accepted & NEG_NONE) {
gensec_gssapi_state->sasl_protection |= NEG_NONE;
} else {
DEBUG(1, ("Remote client does not support unprotected connections, but we failed to negotiate anything better"));
return NT_STATUS_ACCESS_DENIED;
}
/* quirk: This changes the value that gensec_have_feature returns, to be that after SASL negotiation */
gensec_gssapi_state->sasl_state = STAGE_DONE;
if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)) {
DEBUG(5, ("SASL/GSSAPI Connection from client will be cryptographicly sealed\n"));
} else if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SIGN)) {
DEBUG(5, ("SASL/GSSAPI Connection from client will be cryptographicly signed\n"));
} else {
DEBUG(5, ("SASL/GSSAPI Connection from client will have no cryptographic protection\n"));
}
*out = data_blob(NULL, 0);
return NT_STATUS_OK;
}
default:
return NT_STATUS_INVALID_PARAMETER;
}
}
static NTSTATUS gensec_gssapi_wrap(struct gensec_security *gensec_security,
TALLOC_CTX *mem_ctx,
const DATA_BLOB *in,
DATA_BLOB *out)
{
struct gensec_gssapi_state *gensec_gssapi_state
= talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
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_gssapi_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)) {
DEBUG(1, ("gensec_gssapi_wrap: GSS Wrap failed: %s\n",
gssapi_error_string(mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
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_gssapi_state->sasl) {
size_t max_wrapped_size = gensec_gssapi_max_wrapped_size(gensec_security);
if (max_wrapped_size < out->length) {
DEBUG(1, ("gensec_gssapi_wrap: when wrapped, INPUT data (%u) is grew to be larger than SASL negotiated maximum output size (%u > %u)\n",
(unsigned)in->length,
(unsigned)out->length,
(unsigned int)max_wrapped_size));
return NT_STATUS_INVALID_PARAMETER;
}
}
if (gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL)
&& !conf_state) {
return NT_STATUS_ACCESS_DENIED;
}
return NT_STATUS_OK;
}
static NTSTATUS gensec_gssapi_unwrap(struct gensec_security *gensec_security,
TALLOC_CTX *mem_ctx,
const DATA_BLOB *in,
DATA_BLOB *out)
{
struct gensec_gssapi_state *gensec_gssapi_state
= talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
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;
if (gensec_gssapi_state->sasl) {
size_t max_wrapped_size = gensec_gssapi_max_wrapped_size(gensec_security);
if (max_wrapped_size < in->length) {
DEBUG(1, ("gensec_gssapi_unwrap: WRAPPED data is larger than SASL negotiated maximum size\n"));
return NT_STATUS_INVALID_PARAMETER;
}
}
maj_stat = gss_unwrap(&min_stat,
gensec_gssapi_state->gssapi_context,
&input_token,
&output_token,
&conf_state,
&qop_state);
if (GSS_ERROR(maj_stat)) {
DEBUG(1, ("gensec_gssapi_unwrap: GSS UnWrap failed: %s\n",
gssapi_error_string(mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
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;
}
/* Find out the maximum input size negotiated on this connection */
static size_t gensec_gssapi_max_input_size(struct gensec_security *gensec_security)
{
struct gensec_gssapi_state *gensec_gssapi_state
= talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
OM_uint32 maj_stat, min_stat;
OM_uint32 max_input_size;
maj_stat = gss_wrap_size_limit(&min_stat,
gensec_gssapi_state->gssapi_context,
gensec_have_feature(gensec_security, GENSEC_FEATURE_SEAL),
GSS_C_QOP_DEFAULT,
gensec_gssapi_state->max_wrap_buf_size,
&max_input_size);
if (GSS_ERROR(maj_stat)) {
TALLOC_CTX *mem_ctx = talloc_new(NULL);
DEBUG(1, ("gensec_gssapi_max_input_size: determinaing signature size with gss_wrap_size_limit failed: %s\n",
gssapi_error_string(mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
talloc_free(mem_ctx);
return 0;
}
return max_input_size;
}
/* Find out the maximum output size negotiated on this connection */
static size_t gensec_gssapi_max_wrapped_size(struct gensec_security *gensec_security)
{
struct gensec_gssapi_state *gensec_gssapi_state = talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);;
return gensec_gssapi_state->max_wrap_buf_size;
}
static NTSTATUS gensec_gssapi_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_gssapi_state *gensec_gssapi_state
= talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
OM_uint32 maj_stat, min_stat;
gss_buffer_desc input_token, output_token;
int conf_state;
ssize_t sig_length;
input_token.length = length;
input_token.value = data;
maj_stat = gss_wrap(&min_stat,
gensec_gssapi_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)) {
DEBUG(1, ("gensec_gssapi_seal_packet: GSS Wrap failed: %s\n",
gssapi_error_string(mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
return NT_STATUS_ACCESS_DENIED;
}
if (output_token.length < input_token.length) {
DEBUG(1, ("gensec_gssapi_seal_packet: GSS Wrap length [%ld] *less* than caller length [%ld]\n",
(long)output_token.length, (long)length));
return NT_STATUS_INTERNAL_ERROR;
}
sig_length = output_token.length - input_token.length;
memcpy(data, ((uint8_t *)output_token.value) + sig_length, length);
*sig = data_blob_talloc(mem_ctx, (uint8_t *)output_token.value, sig_length);
dump_data_pw("gensec_gssapi_seal_packet: sig\n", sig->data, sig->length);
dump_data_pw("gensec_gssapi_seal_packet: clear\n", data, length);
dump_data_pw("gensec_gssapi_seal_packet: sealed\n", ((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_gssapi_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_gssapi_state *gensec_gssapi_state
= talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
OM_uint32 maj_stat, min_stat;
gss_buffer_desc input_token, output_token;
int conf_state;
gss_qop_t qop_state;
DATA_BLOB in;
dump_data_pw("gensec_gssapi_unseal_packet: sig\n", 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_gssapi_state->gssapi_context,
&input_token,
&output_token,
&conf_state,
&qop_state);
if (GSS_ERROR(maj_stat)) {
DEBUG(1, ("gensec_gssapi_unseal_packet: GSS UnWrap failed: %s\n",
gssapi_error_string(mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
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_gssapi_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_gssapi_state *gensec_gssapi_state
= talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
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_gssapi_state->gssapi_context,
0,
GSS_C_QOP_DEFAULT,
&input_token,
&conf_state,
&output_token);
if (GSS_ERROR(maj_stat)) {
DEBUG(1, ("GSS Wrap failed: %s\n",
gssapi_error_string(mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
return NT_STATUS_ACCESS_DENIED;
}
if (output_token.length < input_token.length) {
DEBUG(1, ("gensec_gssapi_sign_packet: GSS Wrap length [%ld] *less* than caller length [%ld]\n",
(long)output_token.length, (long)length));
return NT_STATUS_INTERNAL_ERROR;
}
/* Caller must pad to right boundary */
sig_length = output_token.length - input_token.length;
*sig = data_blob_talloc(mem_ctx, (uint8_t *)output_token.value, sig_length);
dump_data_pw("gensec_gssapi_seal_packet: sig\n", sig->data, sig->length);
gss_release_buffer(&min_stat, &output_token);
return NT_STATUS_OK;
}
static NTSTATUS gensec_gssapi_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_gssapi_state *gensec_gssapi_state
= talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
OM_uint32 maj_stat, min_stat;
gss_buffer_desc input_token, output_token;
int conf_state;
gss_qop_t qop_state;
DATA_BLOB in;
dump_data_pw("gensec_gssapi_seal_packet: sig\n", 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_gssapi_state->gssapi_context,
&input_token,
&output_token,
&conf_state,
&qop_state);
if (GSS_ERROR(maj_stat)) {
DEBUG(1, ("GSS UnWrap failed: %s\n",
gssapi_error_string(mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
return NT_STATUS_ACCESS_DENIED;
}
if (output_token.length != length) {
return NT_STATUS_INTERNAL_ERROR;
}
gss_release_buffer(&min_stat, &output_token);
return NT_STATUS_OK;
}
/* Try to figure out what features we actually got on the connection */
static bool gensec_gssapi_have_feature(struct gensec_security *gensec_security,
uint32_t feature)
{
struct gensec_gssapi_state *gensec_gssapi_state
= talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
if (feature & GENSEC_FEATURE_SIGN) {
/* If we are going GSSAPI SASL, then we honour the second negotiation */
if (gensec_gssapi_state->sasl
&& gensec_gssapi_state->sasl_state == STAGE_DONE) {
return ((gensec_gssapi_state->sasl_protection & NEG_SIGN)
&& (gensec_gssapi_state->got_flags & GSS_C_INTEG_FLAG));
}
return gensec_gssapi_state->got_flags & GSS_C_INTEG_FLAG;
}
if (feature & GENSEC_FEATURE_SEAL) {
/* If we are going GSSAPI SASL, then we honour the second negotiation */
if (gensec_gssapi_state->sasl
&& gensec_gssapi_state->sasl_state == STAGE_DONE) {
return ((gensec_gssapi_state->sasl_protection & NEG_SEAL)
&& (gensec_gssapi_state->got_flags & GSS_C_CONF_FLAG));
}
return gensec_gssapi_state->got_flags & GSS_C_CONF_FLAG;
}
if (feature & GENSEC_FEATURE_SESSION_KEY) {
/* Only for GSSAPI/Krb5 */
if (gss_oid_equal(gensec_gssapi_state->gss_oid, gss_mech_krb5)) {
return true;
}
}
if (feature & GENSEC_FEATURE_DCE_STYLE) {
return gensec_gssapi_state->got_flags & GSS_C_DCE_STYLE;
}
/* We can always do async (rather than strict request/reply) packets. */
if (feature & GENSEC_FEATURE_ASYNC_REPLIES) {
return true;
}
return false;
}
/*
* Extract the 'sesssion key' needed by SMB signing and ncacn_np
* (for encrypting some passwords).
*
* This breaks all the abstractions, but what do you expect...
*/
static NTSTATUS gensec_gssapi_session_key(struct gensec_security *gensec_security,
DATA_BLOB *session_key)
{
struct gensec_gssapi_state *gensec_gssapi_state
= talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
OM_uint32 maj_stat, min_stat;
krb5_keyblock *subkey;
if (gensec_gssapi_state->session_key.data) {
*session_key = gensec_gssapi_state->session_key;
return NT_STATUS_OK;
}
maj_stat = gsskrb5_get_initiator_subkey(&min_stat,
gensec_gssapi_state->gssapi_context,
&subkey);
if (maj_stat != 0) {
DEBUG(1, ("NO session key for this mech\n"));
return NT_STATUS_NO_USER_SESSION_KEY;
}
DEBUG(10, ("Got KRB5 session key of length %d\n",
(int)KRB5_KEY_LENGTH(subkey)));
gensec_gssapi_state->session_key = data_blob_talloc(gensec_gssapi_state,
KRB5_KEY_DATA(subkey), KRB5_KEY_LENGTH(subkey));
krb5_free_keyblock(gensec_gssapi_state->smb_krb5_context->krb5_context, subkey);
*session_key = gensec_gssapi_state->session_key;
dump_data_pw("KRB5 Session Key:\n", session_key->data, session_key->length);
return NT_STATUS_OK;
}
/* Get some basic (and authorization) information about the user on
* this session. This uses either the PAC (if present) or a local
* database lookup */
static NTSTATUS gensec_gssapi_session_info(struct gensec_security *gensec_security,
struct auth_session_info **_session_info)
{
NTSTATUS nt_status;
TALLOC_CTX *mem_ctx;
struct gensec_gssapi_state *gensec_gssapi_state
= talloc_get_type(gensec_security->private_data, struct gensec_gssapi_state);
struct auth_serversupplied_info *server_info = NULL;
struct auth_session_info *session_info = NULL;
struct PAC_LOGON_INFO *logon_info;
OM_uint32 maj_stat, min_stat;
gss_buffer_desc name_token;
gss_buffer_desc pac;
krb5_keyblock *keyblock;
time_t authtime;
krb5_principal principal;
char *principal_string;
DATA_BLOB pac_blob;
if ((gensec_gssapi_state->gss_oid->length != gss_mech_krb5->length)
|| (memcmp(gensec_gssapi_state->gss_oid->elements, gss_mech_krb5->elements,
gensec_gssapi_state->gss_oid->length) != 0)) {
DEBUG(1, ("NO session info available for this mech\n"));
return NT_STATUS_INVALID_PARAMETER;
}
mem_ctx = talloc_named(gensec_gssapi_state, 0, "gensec_gssapi_session_info context");
NT_STATUS_HAVE_NO_MEMORY(mem_ctx);
maj_stat = gss_display_name (&min_stat,
gensec_gssapi_state->client_name,
&name_token,
NULL);
if (GSS_ERROR(maj_stat)) {
DEBUG(1, ("GSS display_name failed: %s\n",
gssapi_error_string(mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
talloc_free(mem_ctx);
return NT_STATUS_FOOBAR;
}
principal_string = talloc_strndup(mem_ctx,
(const char *)name_token.value,
name_token.length);
gss_release_buffer(&min_stat, &name_token);
if (!principal_string) {
talloc_free(mem_ctx);
return NT_STATUS_NO_MEMORY;
}
maj_stat = gsskrb5_extract_authz_data_from_sec_context(&min_stat,
gensec_gssapi_state->gssapi_context,
KRB5_AUTHDATA_WIN2K_PAC,
&pac);
if (maj_stat == 0) {
pac_blob = data_blob_talloc(mem_ctx, pac.value, pac.length);
gss_release_buffer(&min_stat, &pac);
} else {
pac_blob = data_blob(NULL, 0);
}
/* IF we have the PAC - otherwise we need to get this
* data from elsewere - local ldb, or (TODO) lookup of some
* kind...
*/
if (pac_blob.length) {
krb5_error_code ret;
union netr_Validation validation;
maj_stat = gsskrb5_extract_authtime_from_sec_context(&min_stat,
gensec_gssapi_state->gssapi_context,
&authtime);
if (GSS_ERROR(maj_stat)) {
DEBUG(1, ("gsskrb5_extract_authtime_from_sec_context: %s\n",
gssapi_error_string(mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
talloc_free(mem_ctx);
return NT_STATUS_FOOBAR;
}
maj_stat = gsskrb5_extract_service_keyblock(&min_stat,
gensec_gssapi_state->gssapi_context,
&keyblock);
if (GSS_ERROR(maj_stat)) {
DEBUG(1, ("gsskrb5_copy_service_keyblock failed: %s\n",
gssapi_error_string(mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
talloc_free(mem_ctx);
return NT_STATUS_FOOBAR;
}
ret = krb5_parse_name_flags(gensec_gssapi_state->smb_krb5_context->krb5_context,
principal_string,
KRB5_PRINCIPAL_PARSE_MUST_REALM,
&principal);
if (ret) {
krb5_free_keyblock(gensec_gssapi_state->smb_krb5_context->krb5_context,
keyblock);
talloc_free(mem_ctx);
return NT_STATUS_INVALID_PARAMETER;
}
/* decode and verify the pac */
nt_status = kerberos_pac_logon_info(mem_ctx, &logon_info, pac_blob,
gensec_gssapi_state->smb_krb5_context->krb5_context,
NULL, keyblock, principal, authtime, NULL);
krb5_free_principal(gensec_gssapi_state->smb_krb5_context->krb5_context, principal);
krb5_free_keyblock(gensec_gssapi_state->smb_krb5_context->krb5_context,
keyblock);
if (!NT_STATUS_IS_OK(nt_status)) {
talloc_free(mem_ctx);
return nt_status;
}
validation.sam3 = &logon_info->info3;
nt_status = make_server_info_netlogon_validation(gensec_gssapi_state,
NULL,
3, &validation,
&server_info);
if (!NT_STATUS_IS_OK(nt_status)) {
talloc_free(mem_ctx);
return nt_status;
}
} else if (!lp_parm_bool(gensec_security->lp_ctx, NULL, "gensec", "require_pac", false)) {
DEBUG(1, ("Unable to find PAC, resorting to local user lookup: %s\n",
gssapi_error_string(mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
nt_status = sam_get_server_info_principal(mem_ctx, gensec_security->lp_ctx, principal_string,
&server_info);
if (!NT_STATUS_IS_OK(nt_status)) {
talloc_free(mem_ctx);
return nt_status;
}
} else {
DEBUG(1, ("Unable to find PAC in ticket from %s, failing to allow access: %s\n",
principal_string,
gssapi_error_string(mem_ctx, maj_stat, min_stat, gensec_gssapi_state->gss_oid)));
return NT_STATUS_ACCESS_DENIED;
}
/* references the server_info into the session_info */
nt_status = auth_generate_session_info(mem_ctx, gensec_security->lp_ctx, server_info, &session_info);
if (!NT_STATUS_IS_OK(nt_status)) {
talloc_free(mem_ctx);
return nt_status;
}
nt_status = gensec_gssapi_session_key(gensec_security, &session_info->session_key);
if (!NT_STATUS_IS_OK(nt_status)) {
talloc_free(mem_ctx);
return nt_status;
}
if (!(gensec_gssapi_state->got_flags & GSS_C_DELEG_FLAG)) {
DEBUG(10, ("gensec_gssapi: NO delegated credentials supplied by client\n"));
} else {
krb5_error_code ret;
DEBUG(10, ("gensec_gssapi: delegated credentials supplied by client\n"));
session_info->credentials = cli_credentials_init(session_info);
if (!session_info->credentials) {
talloc_free(mem_ctx);
return NT_STATUS_NO_MEMORY;
}
cli_credentials_set_event_context(session_info->credentials, gensec_security->event_ctx);
cli_credentials_set_conf(session_info->credentials, gensec_security->lp_ctx);
/* Just so we don't segfault trying to get at a username */
cli_credentials_set_anonymous(session_info->credentials);
ret = cli_credentials_set_client_gss_creds(session_info->credentials,
gensec_gssapi_state->delegated_cred_handle,
CRED_SPECIFIED);
if (ret) {
talloc_free(mem_ctx);
return NT_STATUS_NO_MEMORY;
}
/* This credential handle isn't useful for password authentication, so ensure nobody tries to do that */
cli_credentials_set_kerberos_state(session_info->credentials, CRED_MUST_USE_KERBEROS);
/* It has been taken from this place... */
gensec_gssapi_state->delegated_cred_handle = GSS_C_NO_CREDENTIAL;
}
talloc_steal(gensec_gssapi_state, session_info);
talloc_free(mem_ctx);
*_session_info = session_info;
return NT_STATUS_OK;
}
static const char *gensec_gssapi_krb5_oids[] = {
GENSEC_OID_KERBEROS5_OLD,
GENSEC_OID_KERBEROS5,
NULL
};
static const char *gensec_gssapi_spnego_oids[] = {
GENSEC_OID_SPNEGO,
NULL
};
/* As a server, this could in theory accept any GSSAPI mech */
static const struct gensec_security_ops gensec_gssapi_spnego_security_ops = {
.name = "gssapi_spnego",
.sasl_name = "GSS-SPNEGO",
.auth_type = DCERPC_AUTH_TYPE_SPNEGO,
.oid = gensec_gssapi_spnego_oids,
.client_start = gensec_gssapi_client_start,
.server_start = gensec_gssapi_server_start,
.magic = gensec_gssapi_magic,
.update = gensec_gssapi_update,
.session_key = gensec_gssapi_session_key,
.session_info = gensec_gssapi_session_info,
.sign_packet = gensec_gssapi_sign_packet,
.check_packet = gensec_gssapi_check_packet,
.seal_packet = gensec_gssapi_seal_packet,
.unseal_packet = gensec_gssapi_unseal_packet,
.wrap = gensec_gssapi_wrap,
.unwrap = gensec_gssapi_unwrap,
.have_feature = gensec_gssapi_have_feature,
.enabled = false,
.kerberos = true,
.priority = GENSEC_GSSAPI
};
/* As a server, this could in theory accept any GSSAPI mech */
static const struct gensec_security_ops gensec_gssapi_krb5_security_ops = {
.name = "gssapi_krb5",
.auth_type = DCERPC_AUTH_TYPE_KRB5,
.oid = gensec_gssapi_krb5_oids,
.client_start = gensec_gssapi_client_start,
.server_start = gensec_gssapi_server_start,
.magic = gensec_gssapi_magic,
.update = gensec_gssapi_update,
.session_key = gensec_gssapi_session_key,
.session_info = gensec_gssapi_session_info,
.sign_packet = gensec_gssapi_sign_packet,
.check_packet = gensec_gssapi_check_packet,
.seal_packet = gensec_gssapi_seal_packet,
.unseal_packet = gensec_gssapi_unseal_packet,
.wrap = gensec_gssapi_wrap,
.unwrap = gensec_gssapi_unwrap,
.have_feature = gensec_gssapi_have_feature,
.enabled = true,
.kerberos = true,
.priority = GENSEC_GSSAPI
};
/* As a server, this could in theory accept any GSSAPI mech */
static const struct gensec_security_ops gensec_gssapi_sasl_krb5_security_ops = {
.name = "gssapi_krb5_sasl",
.sasl_name = "GSSAPI",
.client_start = gensec_gssapi_sasl_client_start,
.server_start = gensec_gssapi_sasl_server_start,
.update = gensec_gssapi_update,
.session_key = gensec_gssapi_session_key,
.session_info = gensec_gssapi_session_info,
.max_input_size = gensec_gssapi_max_input_size,
.max_wrapped_size = gensec_gssapi_max_wrapped_size,
.wrap = gensec_gssapi_wrap,
.unwrap = gensec_gssapi_unwrap,
.have_feature = gensec_gssapi_have_feature,
.enabled = true,
.kerberos = true,
.priority = GENSEC_GSSAPI
};
NTSTATUS gensec_gssapi_init(void)
{
NTSTATUS ret;
ret = gensec_register(&gensec_gssapi_spnego_security_ops);
if (!NT_STATUS_IS_OK(ret)) {
DEBUG(0,("Failed to register '%s' gensec backend!\n",
gensec_gssapi_spnego_security_ops.name));
return ret;
}
ret = gensec_register(&gensec_gssapi_krb5_security_ops);
if (!NT_STATUS_IS_OK(ret)) {
DEBUG(0,("Failed to register '%s' gensec backend!\n",
gensec_gssapi_krb5_security_ops.name));
return ret;
}
ret = gensec_register(&gensec_gssapi_sasl_krb5_security_ops);
if (!NT_STATUS_IS_OK(ret)) {
DEBUG(0,("Failed to register '%s' gensec backend!\n",
gensec_gssapi_sasl_krb5_security_ops.name));
return ret;
}
return ret;
}
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