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samba-mirror/source4/auth/session.c

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/*
Unix SMB/CIFS implementation.
Authentication utility functions
Copyright (C) Andrew Tridgell 1992-1998
Copyright (C) Andrew Bartlett 2001-2010
Copyright (C) Jeremy Allison 2000-2001
Copyright (C) Rafal Szczesniak 2002
Copyright (C) Stefan Metzmacher 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 "auth/auth.h"
#include "auth/auth_sam.h"
#include "auth/credentials/credentials.h"
#include "auth/credentials/credentials_krb5.h"
#include "libcli/security/security.h"
#include "libcli/auth/libcli_auth.h"
#include "dsdb/samdb/samdb.h"
#include "auth/session_proto.h"
#include "system/kerberos.h"
#include <gssapi/gssapi.h>
#include "libcli/wbclient/wbclient.h"
#undef DBGC_CLASS
#define DBGC_CLASS DBGC_AUTH
_PUBLIC_ struct auth_session_info *anonymous_session(TALLOC_CTX *mem_ctx,
struct loadparm_context *lp_ctx)
{
NTSTATUS nt_status;
struct auth_session_info *session_info = NULL;
nt_status = auth_anonymous_session_info(mem_ctx, lp_ctx, &session_info);
if (!NT_STATUS_IS_OK(nt_status)) {
return NULL;
}
return session_info;
}
_PUBLIC_ NTSTATUS auth_generate_session_info(TALLOC_CTX *mem_ctx,
struct loadparm_context *lp_ctx, /* Optional, if you don't want privilages */
struct ldb_context *sam_ctx, /* Optional, if you don't want local groups */
struct auth_user_info_dc *user_info_dc,
uint32_t session_info_flags,
struct auth_session_info **_session_info)
{
struct auth_session_info *session_info;
NTSTATUS nt_status;
unsigned int i, num_sids = 0;
const char *filter;
struct dom_sid *sids = NULL;
const struct dom_sid *anonymous_sid, *system_sid;
TALLOC_CTX *tmp_ctx = talloc_new(mem_ctx);
NT_STATUS_HAVE_NO_MEMORY(tmp_ctx);
session_info = talloc_zero(tmp_ctx, struct auth_session_info);
if (session_info == NULL) {
TALLOC_FREE(tmp_ctx);
return NT_STATUS_NO_MEMORY;
}
session_info->info = talloc_reference(session_info, user_info_dc->info);
session_info->torture = talloc_zero(session_info, struct auth_user_info_torture);
if (session_info->torture == NULL) {
TALLOC_FREE(tmp_ctx);
return NT_STATUS_NO_MEMORY;
}
session_info->torture->num_dc_sids = user_info_dc->num_sids;
session_info->torture->dc_sids = talloc_reference(session_info, user_info_dc->sids);
if (session_info->torture->dc_sids == NULL) {
TALLOC_FREE(tmp_ctx);
return NT_STATUS_NO_MEMORY;
}
/* unless set otherwise, the session key is the user session
* key from the auth subsystem */
session_info->session_key = data_blob_talloc(session_info, user_info_dc->user_session_key.data, user_info_dc->user_session_key.length);
if (!session_info->session_key.data && session_info->session_key.length) {
if (session_info->session_key.data == NULL) {
TALLOC_FREE(tmp_ctx);
return NT_STATUS_NO_MEMORY;
}
}
anonymous_sid = dom_sid_parse_talloc(tmp_ctx, SID_NT_ANONYMOUS);
if (anonymous_sid == NULL) {
TALLOC_FREE(tmp_ctx);
return NT_STATUS_NO_MEMORY;
}
system_sid = dom_sid_parse_talloc(tmp_ctx, SID_NT_SYSTEM);
if (system_sid == NULL) {
TALLOC_FREE(tmp_ctx);
return NT_STATUS_NO_MEMORY;
}
sids = talloc_array(tmp_ctx, struct dom_sid, user_info_dc->num_sids);
if (sids == NULL) {
TALLOC_FREE(tmp_ctx);
return NT_STATUS_NO_MEMORY;
}
num_sids = user_info_dc->num_sids;
for (i=0; i < user_info_dc->num_sids; i++) {
sids[i] = user_info_dc->sids[i];
}
/*
* Finally add the "standard" sids.
* The only difference between guest and "anonymous"
* is the addition of Authenticated_Users.
*/
if (session_info_flags & AUTH_SESSION_INFO_DEFAULT_GROUPS) {
sids = talloc_realloc(tmp_ctx, sids, struct dom_sid, num_sids + 2);
if (sids == NULL) {
TALLOC_FREE(tmp_ctx);
return NT_STATUS_NO_MEMORY;
}
sid_copy(&sids[num_sids], &global_sid_World);
num_sids++;
sid_copy(&sids[num_sids], &global_sid_Network);
num_sids++;
}
if (session_info_flags & AUTH_SESSION_INFO_AUTHENTICATED) {
sids = talloc_realloc(tmp_ctx, sids, struct dom_sid, num_sids + 1);
if (sids == NULL) {
TALLOC_FREE(tmp_ctx);
return NT_STATUS_NO_MEMORY;
}
sid_copy(&sids[num_sids], &global_sid_Authenticated_Users);
num_sids++;
}
if (session_info_flags & AUTH_SESSION_INFO_NTLM) {
sids = talloc_realloc(tmp_ctx, sids, struct dom_sid, num_sids + 1);
if (sids == NULL) {
TALLOC_FREE(tmp_ctx);
return NT_STATUS_NO_MEMORY;
}
if (!dom_sid_parse(SID_NT_NTLM_AUTHENTICATION, &sids[num_sids])) {
TALLOC_FREE(tmp_ctx);
return NT_STATUS_INTERNAL_ERROR;
}
num_sids++;
}
if (num_sids > PRIMARY_USER_SID_INDEX && dom_sid_equal(anonymous_sid, &sids[PRIMARY_USER_SID_INDEX])) {
/* Don't expand nested groups of system, anonymous etc*/
} else if (num_sids > PRIMARY_USER_SID_INDEX && dom_sid_equal(system_sid, &sids[PRIMARY_USER_SID_INDEX])) {
/* Don't expand nested groups of system, anonymous etc*/
} else if (sam_ctx) {
filter = talloc_asprintf(tmp_ctx, "(&(objectClass=group)(groupType:1.2.840.113556.1.4.803:=%u))",
GROUP_TYPE_BUILTIN_LOCAL_GROUP);
/* Search for each group in the token */
for (i = 0; i < num_sids; i++) {
struct dom_sid_buf buf;
const char *sid_dn;
DATA_BLOB sid_blob;
sid_dn = talloc_asprintf(
tmp_ctx,
"<SID=%s>",
dom_sid_str_buf(&sids[i], &buf));
if (sid_dn == NULL) {
TALLOC_FREE(tmp_ctx);
return NT_STATUS_NO_MEMORY;
}
sid_blob = data_blob_string_const(sid_dn);
/* This function takes in memberOf values and expands
* them, as long as they meet the filter - so only
* builtin groups
*
* We already have the SID in the token, so set
* 'only childs' flag to true */
nt_status = dsdb_expand_nested_groups(sam_ctx, &sid_blob, true, filter,
tmp_ctx, &sids, &num_sids);
if (!NT_STATUS_IS_OK(nt_status)) {
talloc_free(tmp_ctx);
return nt_status;
}
}
}
nt_status = security_token_create(session_info,
lp_ctx,
num_sids,
sids,
session_info_flags,
&session_info->security_token);
if (!NT_STATUS_IS_OK(nt_status)) {
TALLOC_FREE(tmp_ctx);
return nt_status;
}
session_info->unique_session_token = GUID_random();
session_info->credentials = NULL;
talloc_steal(mem_ctx, session_info);
*_session_info = session_info;
talloc_free(tmp_ctx);
return NT_STATUS_OK;
}
/* Fill out the auth_session_info with a cli_credentials based on the
* auth_session_info we were forwarded over named pipe forwarding.
*
* NOTE: The stucture members of session_info_transport are stolen
* with talloc_move() into auth_session_info for long term use
*/
struct auth_session_info *auth_session_info_from_transport(TALLOC_CTX *mem_ctx,
struct auth_session_info_transport *session_info_transport,
struct loadparm_context *lp_ctx,
const char **reason)
{
struct auth_session_info *session_info;
session_info = talloc_steal(mem_ctx, session_info_transport->session_info);
/*
* This is to allow us to check the type of this pointer using
* talloc_get_type()
*/
talloc_set_name(session_info, "struct auth_session_info");
#ifdef HAVE_GSS_IMPORT_CRED
if (session_info_transport->exported_gssapi_credentials.length) {
struct cli_credentials *creds;
OM_uint32 minor_status;
gss_buffer_desc cred_token;
gss_cred_id_t cred_handle;
const char *error_string;
int ret;
DEBUG(10, ("Delegated credentials supplied by client\n"));
cred_token.value = session_info_transport->exported_gssapi_credentials.data;
cred_token.length = session_info_transport->exported_gssapi_credentials.length;
ret = gss_import_cred(&minor_status,
&cred_token,
&cred_handle);
if (ret != GSS_S_COMPLETE) {
*reason = "Internal error in gss_import_cred()";
return NULL;
}
creds = cli_credentials_init(session_info);
if (!creds) {
*reason = "Out of memory in cli_credentials_init()";
return NULL;
}
session_info->credentials = creds;
cli_credentials_set_conf(creds, lp_ctx);
/* Just so we don't segfault trying to get at a username */
cli_credentials_set_anonymous(creds);
ret = cli_credentials_set_client_gss_creds(creds,
lp_ctx,
cred_handle,
CRED_SPECIFIED,
&error_string);
if (ret) {
*reason = talloc_asprintf(mem_ctx,
"Failed to set pipe forwarded"
"creds: %s\n", error_string);
return NULL;
}
/* This credential handle isn't useful for password
* authentication, so ensure nobody tries to do that */
cli_credentials_set_kerberos_state(creds,
CRED_USE_KERBEROS_REQUIRED);
}
#endif
return session_info;
}
/* Create a auth_session_info_transport from an auth_session_info.
*
* NOTE: Members of the auth_session_info_transport structure are
* talloc_referenced() into this structure, and should not be changed.
*/
NTSTATUS auth_session_info_transport_from_session(TALLOC_CTX *mem_ctx,
struct auth_session_info *session_info,
struct tevent_context *event_ctx,
struct loadparm_context *lp_ctx,
struct auth_session_info_transport **transport_out)
{
struct auth_session_info_transport *session_info_transport
= talloc_zero(mem_ctx, struct auth_session_info_transport);
if (!session_info_transport) {
return NT_STATUS_NO_MEMORY;
};
session_info_transport->session_info = talloc_reference(session_info_transport, session_info);
if (!session_info_transport->session_info) {
return NT_STATUS_NO_MEMORY;
};
#ifdef HAVE_GSS_EXPORT_CRED
if (session_info->credentials) {
struct gssapi_creds_container *gcc;
OM_uint32 gret;
OM_uint32 minor_status;
gss_buffer_desc cred_token;
const char *error_string;
int ret;
ret = cli_credentials_get_client_gss_creds(session_info->credentials,
event_ctx,
lp_ctx,
&gcc, &error_string);
if (ret != 0) {
*transport_out = session_info_transport;
return NT_STATUS_OK;
}
gret = gss_export_cred(&minor_status,
gcc->creds,
&cred_token);
if (gret != GSS_S_COMPLETE) {
return NT_STATUS_INTERNAL_ERROR;
}
if (cred_token.length) {
session_info_transport->exported_gssapi_credentials
= data_blob_talloc(session_info_transport,
cred_token.value,
cred_token.length);
gss_release_buffer(&minor_status, &cred_token);
NT_STATUS_HAVE_NO_MEMORY(session_info_transport->exported_gssapi_credentials.data);
}
}
#endif
*transport_out = session_info_transport;
return NT_STATUS_OK;
}
/* Produce a session_info for an arbitary DN or principal in the local
* DB, assuming the local DB holds all the groups
*
* Supply either a principal or a DN
*/
NTSTATUS authsam_get_session_info_principal(TALLOC_CTX *mem_ctx,
struct loadparm_context *lp_ctx,
struct ldb_context *sam_ctx,
const char *principal,
struct ldb_dn *user_dn,
uint32_t session_info_flags,
struct auth_session_info **session_info)
{
NTSTATUS nt_status;
struct auth_user_info_dc *user_info_dc;
TALLOC_CTX *tmp_ctx = talloc_new(mem_ctx);
if (!tmp_ctx) {
return NT_STATUS_NO_MEMORY;
}
nt_status = authsam_get_user_info_dc_principal(tmp_ctx, lp_ctx, sam_ctx,
principal, user_dn,
&user_info_dc);
if (!NT_STATUS_IS_OK(nt_status)) {
talloc_free(tmp_ctx);
return nt_status;
}
nt_status = auth_generate_session_info(tmp_ctx, lp_ctx, sam_ctx,
user_info_dc, session_info_flags,
session_info);
if (NT_STATUS_IS_OK(nt_status)) {
talloc_steal(mem_ctx, *session_info);
}
talloc_free(tmp_ctx);
return nt_status;
}
/**
* prints a struct auth_session_info security token to debug output.
*/
void auth_session_info_debug(int dbg_lev,
const struct auth_session_info *session_info)
{
if (!session_info) {
DEBUG(dbg_lev, ("Session Info: (NULL)\n"));
return;
}
security_token_debug(DBGC_AUTH, dbg_lev,
session_info->security_token);
}