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a2f6327f9f
So far this is only on the AD DC Signed-off-by: Andrew Bartlett <abartlet@samba.org> Reviewed-by: Garming Sam <garming@catalyst.net.nz> Pair-Programmed-by: Gary Lockyer <gary@catalyst.net.nz> Signed-off-by: Gary Lockyer <gary@catalyst.net.nz>
418 lines
12 KiB
C
418 lines
12 KiB
C
/*
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Unix SMB/CIFS implementation.
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Authentication utility functions
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Copyright (C) Andrew Tridgell 1992-1998
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Copyright (C) Andrew Bartlett 2001-2010
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Copyright (C) Jeremy Allison 2000-2001
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Copyright (C) Rafal Szczesniak 2002
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Copyright (C) Stefan Metzmacher 2005
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "includes.h"
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#include "auth/auth.h"
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#include "auth/auth_sam.h"
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#include "auth/credentials/credentials.h"
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#include "auth/credentials/credentials_krb5.h"
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#include "libcli/security/security.h"
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#include "libcli/auth/libcli_auth.h"
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#include "dsdb/samdb/samdb.h"
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#include "auth/session_proto.h"
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#include "system/kerberos.h"
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#include <gssapi/gssapi.h>
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#include "libcli/wbclient/wbclient.h"
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_PUBLIC_ struct auth_session_info *anonymous_session(TALLOC_CTX *mem_ctx,
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struct loadparm_context *lp_ctx)
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{
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NTSTATUS nt_status;
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struct auth_session_info *session_info = NULL;
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nt_status = auth_anonymous_session_info(mem_ctx, lp_ctx, &session_info);
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if (!NT_STATUS_IS_OK(nt_status)) {
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return NULL;
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}
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return session_info;
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}
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_PUBLIC_ NTSTATUS auth_generate_session_info(TALLOC_CTX *mem_ctx,
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struct loadparm_context *lp_ctx, /* Optional, if you don't want privilages */
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struct ldb_context *sam_ctx, /* Optional, if you don't want local groups */
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struct auth_user_info_dc *user_info_dc,
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uint32_t session_info_flags,
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struct auth_session_info **_session_info)
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{
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struct auth_session_info *session_info;
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NTSTATUS nt_status;
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unsigned int i, num_sids = 0;
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const char *filter;
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struct dom_sid *sids = NULL;
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const struct dom_sid *anonymous_sid, *system_sid;
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TALLOC_CTX *tmp_ctx = talloc_new(mem_ctx);
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NT_STATUS_HAVE_NO_MEMORY(tmp_ctx);
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session_info = talloc_zero(tmp_ctx, struct auth_session_info);
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if (session_info == NULL) {
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TALLOC_FREE(tmp_ctx);
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return NT_STATUS_NO_MEMORY;
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}
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session_info->info = talloc_reference(session_info, user_info_dc->info);
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session_info->torture = talloc_zero(session_info, struct auth_user_info_torture);
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if (session_info->torture == NULL) {
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TALLOC_FREE(tmp_ctx);
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return NT_STATUS_NO_MEMORY;
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}
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session_info->torture->num_dc_sids = user_info_dc->num_sids;
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session_info->torture->dc_sids = talloc_reference(session_info, user_info_dc->sids);
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if (session_info->torture->dc_sids == NULL) {
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TALLOC_FREE(tmp_ctx);
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return NT_STATUS_NO_MEMORY;
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}
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/* unless set otherwise, the session key is the user session
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* key from the auth subsystem */
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session_info->session_key = data_blob_talloc(session_info, user_info_dc->user_session_key.data, user_info_dc->user_session_key.length);
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if (!session_info->session_key.data && session_info->session_key.length) {
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if (session_info->session_key.data == NULL) {
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TALLOC_FREE(tmp_ctx);
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return NT_STATUS_NO_MEMORY;
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}
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}
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anonymous_sid = dom_sid_parse_talloc(tmp_ctx, SID_NT_ANONYMOUS);
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if (anonymous_sid == NULL) {
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TALLOC_FREE(tmp_ctx);
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return NT_STATUS_NO_MEMORY;
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}
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system_sid = dom_sid_parse_talloc(tmp_ctx, SID_NT_SYSTEM);
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if (system_sid == NULL) {
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TALLOC_FREE(tmp_ctx);
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return NT_STATUS_NO_MEMORY;
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}
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sids = talloc_array(tmp_ctx, struct dom_sid, user_info_dc->num_sids);
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if (sids == NULL) {
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TALLOC_FREE(tmp_ctx);
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return NT_STATUS_NO_MEMORY;
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}
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if (!sids) {
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talloc_free(tmp_ctx);
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return NT_STATUS_NO_MEMORY;
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}
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num_sids = user_info_dc->num_sids;
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for (i=0; i < user_info_dc->num_sids; i++) {
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sids[i] = user_info_dc->sids[i];
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}
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/*
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* Finally add the "standard" sids.
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* The only difference between guest and "anonymous"
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* is the addition of Authenticated_Users.
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*/
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if (session_info_flags & AUTH_SESSION_INFO_DEFAULT_GROUPS) {
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sids = talloc_realloc(tmp_ctx, sids, struct dom_sid, num_sids + 2);
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NT_STATUS_HAVE_NO_MEMORY(sids);
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if (!dom_sid_parse(SID_WORLD, &sids[num_sids])) {
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return NT_STATUS_INTERNAL_ERROR;
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}
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num_sids++;
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if (!dom_sid_parse(SID_NT_NETWORK, &sids[num_sids])) {
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return NT_STATUS_INTERNAL_ERROR;
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}
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num_sids++;
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}
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if (session_info_flags & AUTH_SESSION_INFO_AUTHENTICATED) {
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sids = talloc_realloc(tmp_ctx, sids, struct dom_sid, num_sids + 1);
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NT_STATUS_HAVE_NO_MEMORY(sids);
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if (!dom_sid_parse(SID_NT_AUTHENTICATED_USERS, &sids[num_sids])) {
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return NT_STATUS_INTERNAL_ERROR;
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}
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num_sids++;
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}
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if (session_info_flags & AUTH_SESSION_INFO_NTLM) {
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sids = talloc_realloc(tmp_ctx, sids, struct dom_sid, num_sids + 1);
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NT_STATUS_HAVE_NO_MEMORY(sids);
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if (!dom_sid_parse(SID_NT_NTLM_AUTHENTICATION, &sids[num_sids])) {
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return NT_STATUS_INTERNAL_ERROR;
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}
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num_sids++;
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}
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if (num_sids > PRIMARY_USER_SID_INDEX && dom_sid_equal(anonymous_sid, &sids[PRIMARY_USER_SID_INDEX])) {
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/* Don't expand nested groups of system, anonymous etc*/
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} else if (num_sids > PRIMARY_USER_SID_INDEX && dom_sid_equal(system_sid, &sids[PRIMARY_USER_SID_INDEX])) {
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/* Don't expand nested groups of system, anonymous etc*/
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} else if (sam_ctx) {
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filter = talloc_asprintf(tmp_ctx, "(&(objectClass=group)(groupType:1.2.840.113556.1.4.803:=%u))",
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GROUP_TYPE_BUILTIN_LOCAL_GROUP);
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/* Search for each group in the token */
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for (i = 0; i < num_sids; i++) {
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char *sid_string;
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const char *sid_dn;
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DATA_BLOB sid_blob;
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sid_string = dom_sid_string(tmp_ctx,
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&sids[i]);
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if (sid_string == NULL) {
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TALLOC_FREE(user_info_dc);
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return NT_STATUS_NO_MEMORY;
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}
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sid_dn = talloc_asprintf(tmp_ctx, "<SID=%s>", sid_string);
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talloc_free(sid_string);
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if (sid_dn == NULL) {
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TALLOC_FREE(user_info_dc);
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return NT_STATUS_NO_MEMORY;
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}
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sid_blob = data_blob_string_const(sid_dn);
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/* This function takes in memberOf values and expands
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* them, as long as they meet the filter - so only
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* builtin groups
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*
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* We already have the SID in the token, so set
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* 'only childs' flag to true */
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nt_status = dsdb_expand_nested_groups(sam_ctx, &sid_blob, true, filter,
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tmp_ctx, &sids, &num_sids);
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if (!NT_STATUS_IS_OK(nt_status)) {
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talloc_free(tmp_ctx);
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return nt_status;
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}
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}
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}
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nt_status = security_token_create(session_info,
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lp_ctx,
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num_sids,
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sids,
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session_info_flags,
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&session_info->security_token);
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if (!NT_STATUS_IS_OK(nt_status)) {
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TALLOC_FREE(tmp_ctx);
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return nt_status;
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}
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session_info->credentials = NULL;
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talloc_steal(mem_ctx, session_info);
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*_session_info = session_info;
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talloc_free(tmp_ctx);
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return NT_STATUS_OK;
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}
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/* Fill out the auth_session_info with a cli_credentials based on the
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* auth_session_info we were forwarded over named pipe forwarding.
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*
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* NOTE: The stucture members of session_info_transport are stolen
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* with talloc_move() into auth_session_info for long term use
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*/
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struct auth_session_info *auth_session_info_from_transport(TALLOC_CTX *mem_ctx,
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struct auth_session_info_transport *session_info_transport,
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struct loadparm_context *lp_ctx,
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const char **reason)
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{
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struct auth_session_info *session_info;
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session_info = talloc_steal(mem_ctx, session_info_transport->session_info);
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/*
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* This is to allow us to check the type of this pointer using
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* talloc_get_type()
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*/
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talloc_set_name(session_info, "struct auth_session_info");
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#ifdef HAVE_GSS_IMPORT_CRED
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if (session_info_transport->exported_gssapi_credentials.length) {
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struct cli_credentials *creds;
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OM_uint32 minor_status;
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gss_buffer_desc cred_token;
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gss_cred_id_t cred_handle;
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const char *error_string;
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int ret;
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DEBUG(10, ("Delegated credentials supplied by client\n"));
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cred_token.value = session_info_transport->exported_gssapi_credentials.data;
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cred_token.length = session_info_transport->exported_gssapi_credentials.length;
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ret = gss_import_cred(&minor_status,
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&cred_token,
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&cred_handle);
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if (ret != GSS_S_COMPLETE) {
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*reason = "Internal error in gss_import_cred()";
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return NULL;
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}
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creds = cli_credentials_init(session_info);
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if (!creds) {
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*reason = "Out of memory in cli_credentials_init()";
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return NULL;
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}
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session_info->credentials = creds;
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cli_credentials_set_conf(creds, lp_ctx);
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/* Just so we don't segfault trying to get at a username */
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cli_credentials_set_anonymous(creds);
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ret = cli_credentials_set_client_gss_creds(creds,
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lp_ctx,
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cred_handle,
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CRED_SPECIFIED,
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&error_string);
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if (ret) {
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*reason = talloc_asprintf(mem_ctx,
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"Failed to set pipe forwarded"
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"creds: %s\n", error_string);
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return NULL;
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}
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/* This credential handle isn't useful for password
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* authentication, so ensure nobody tries to do that */
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cli_credentials_set_kerberos_state(creds,
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CRED_MUST_USE_KERBEROS);
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}
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#endif
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return session_info;
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}
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/* Create a auth_session_info_transport from an auth_session_info.
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*
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* NOTE: Members of the auth_session_info_transport structure are
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* talloc_referenced() into this structure, and should not be changed.
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*/
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NTSTATUS auth_session_info_transport_from_session(TALLOC_CTX *mem_ctx,
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struct auth_session_info *session_info,
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struct tevent_context *event_ctx,
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struct loadparm_context *lp_ctx,
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struct auth_session_info_transport **transport_out)
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{
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struct auth_session_info_transport *session_info_transport
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= talloc_zero(mem_ctx, struct auth_session_info_transport);
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if (!session_info_transport) {
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return NT_STATUS_NO_MEMORY;
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};
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session_info_transport->session_info = talloc_reference(session_info_transport, session_info);
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if (!session_info_transport->session_info) {
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return NT_STATUS_NO_MEMORY;
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};
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#ifdef HAVE_GSS_EXPORT_CRED
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if (session_info->credentials) {
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struct gssapi_creds_container *gcc;
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OM_uint32 gret;
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OM_uint32 minor_status;
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gss_buffer_desc cred_token;
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const char *error_string;
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int ret;
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ret = cli_credentials_get_client_gss_creds(session_info->credentials,
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event_ctx,
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lp_ctx,
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&gcc, &error_string);
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if (ret != 0) {
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*transport_out = session_info_transport;
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return NT_STATUS_OK;
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}
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gret = gss_export_cred(&minor_status,
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gcc->creds,
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&cred_token);
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if (gret != GSS_S_COMPLETE) {
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return NT_STATUS_INTERNAL_ERROR;
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}
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if (cred_token.length) {
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session_info_transport->exported_gssapi_credentials
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= data_blob_talloc(session_info_transport,
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cred_token.value,
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cred_token.length);
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gss_release_buffer(&minor_status, &cred_token);
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NT_STATUS_HAVE_NO_MEMORY(session_info_transport->exported_gssapi_credentials.data);
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}
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}
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#endif
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*transport_out = session_info_transport;
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return NT_STATUS_OK;
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}
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/* Produce a session_info for an arbitary DN or principal in the local
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* DB, assuming the local DB holds all the groups
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*
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* Supply either a principal or a DN
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*/
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NTSTATUS authsam_get_session_info_principal(TALLOC_CTX *mem_ctx,
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struct loadparm_context *lp_ctx,
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struct ldb_context *sam_ctx,
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const char *principal,
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struct ldb_dn *user_dn,
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uint32_t session_info_flags,
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struct auth_session_info **session_info)
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{
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NTSTATUS nt_status;
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struct auth_user_info_dc *user_info_dc;
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TALLOC_CTX *tmp_ctx = talloc_new(mem_ctx);
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if (!tmp_ctx) {
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return NT_STATUS_NO_MEMORY;
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}
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nt_status = authsam_get_user_info_dc_principal(tmp_ctx, lp_ctx, sam_ctx,
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principal, user_dn,
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&user_info_dc);
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if (!NT_STATUS_IS_OK(nt_status)) {
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talloc_free(tmp_ctx);
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return nt_status;
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}
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nt_status = auth_generate_session_info(tmp_ctx, lp_ctx, sam_ctx,
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user_info_dc, session_info_flags,
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session_info);
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if (NT_STATUS_IS_OK(nt_status)) {
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talloc_steal(mem_ctx, *session_info);
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}
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talloc_free(tmp_ctx);
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return nt_status;
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}
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/**
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* prints a struct auth_session_info security token to debug output.
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*/
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void auth_session_info_debug(int dbg_lev,
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const struct auth_session_info *session_info)
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{
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if (!session_info) {
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DEBUG(dbg_lev, ("Session Info: (NULL)\n"));
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return;
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}
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security_token_debug(0, dbg_lev, session_info->security_token);
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}
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