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9d09b66f41
These additional measures should help ensure we do not accidentily upgrade a guest to an authenticated user in the future. Andrew Bartlett Signed-off-by: Andrew Tridgell <tridge@samba.org>
443 lines
14 KiB
C
443 lines
14 KiB
C
/*
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Unix SMB/CIFS implementation.
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Convert a server info struct into the form for PAC and NETLOGON replies
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Copyright (C) Andrew Bartlett <abartlet@samba.org> 2004-2011
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Copyright (C) Stefan Metzmacher <metze@samba.org> 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 "librpc/gen_ndr/auth.h"
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#include "libcli/security/security.h"
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#include "auth/auth_sam_reply.h"
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NTSTATUS auth_convert_user_info_dc_sambaseinfo(TALLOC_CTX *mem_ctx,
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struct auth_user_info_dc *user_info_dc,
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struct netr_SamBaseInfo **_sam)
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{
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NTSTATUS status;
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struct auth_user_info *info;
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struct netr_SamBaseInfo *sam = talloc_zero(mem_ctx, struct netr_SamBaseInfo);
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NT_STATUS_HAVE_NO_MEMORY(sam);
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if (user_info_dc->num_sids > PRIMARY_USER_SID_INDEX) {
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status = dom_sid_split_rid(sam, &user_info_dc->sids[PRIMARY_USER_SID_INDEX],
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&sam->domain_sid, &sam->rid);
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if (!NT_STATUS_IS_OK(status)) {
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return status;
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}
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} else {
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return NT_STATUS_INVALID_PARAMETER;
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}
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if (user_info_dc->num_sids > PRIMARY_GROUP_SID_INDEX) {
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status = dom_sid_split_rid(NULL, &user_info_dc->sids[PRIMARY_GROUP_SID_INDEX],
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NULL, &sam->primary_gid);
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if (!NT_STATUS_IS_OK(status)) {
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return status;
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}
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} else {
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/* if we have to encode something like SYSTEM (with no
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* second SID in the token) then this is the only
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* choice */
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sam->primary_gid = sam->rid;
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}
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info = user_info_dc->info;
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sam->last_logon = info->last_logon;
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sam->last_logoff = info->last_logoff;
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sam->acct_expiry = info->acct_expiry;
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sam->last_password_change = info->last_password_change;
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sam->allow_password_change = info->allow_password_change;
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sam->force_password_change = info->force_password_change;
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sam->account_name.string = info->account_name;
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sam->full_name.string = info->full_name;
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sam->logon_script.string = info->logon_script;
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sam->profile_path.string = info->profile_path;
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sam->home_directory.string = info->home_directory;
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sam->home_drive.string = info->home_drive;
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sam->logon_count = info->logon_count;
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sam->bad_password_count = info->bad_password_count;
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sam->groups.count = 0;
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sam->groups.rids = NULL;
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if (user_info_dc->num_sids > 2) {
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size_t i;
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sam->groups.rids = talloc_array(sam, struct samr_RidWithAttribute,
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user_info_dc->num_sids);
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if (sam->groups.rids == NULL)
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return NT_STATUS_NO_MEMORY;
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for (i=2; i<user_info_dc->num_sids; i++) {
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struct dom_sid *group_sid = &user_info_dc->sids[i];
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if (!dom_sid_in_domain(sam->domain_sid, group_sid)) {
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/* We handle this elsewhere */
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continue;
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}
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sam->groups.rids[sam->groups.count].rid =
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group_sid->sub_auths[group_sid->num_auths-1];
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sam->groups.rids[sam->groups.count].attributes =
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SE_GROUP_MANDATORY | SE_GROUP_ENABLED_BY_DEFAULT | SE_GROUP_ENABLED;
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sam->groups.count += 1;
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}
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}
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sam->user_flags = 0; /* w2k3 uses NETLOGON_EXTRA_SIDS | NETLOGON_NTLMV2_ENABLED */
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if (!user_info_dc->info->authenticated) {
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sam->user_flags |= NETLOGON_GUEST;
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}
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sam->acct_flags = user_info_dc->info->acct_flags;
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sam->logon_server.string = user_info_dc->info->logon_server;
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sam->domain.string = user_info_dc->info->domain_name;
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ZERO_STRUCT(sam->unknown);
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ZERO_STRUCT(sam->key);
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if (user_info_dc->user_session_key.length == sizeof(sam->key.key)) {
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memcpy(sam->key.key, user_info_dc->user_session_key.data, sizeof(sam->key.key));
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}
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ZERO_STRUCT(sam->LMSessKey);
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if (user_info_dc->lm_session_key.length == sizeof(sam->LMSessKey.key)) {
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memcpy(sam->LMSessKey.key, user_info_dc->lm_session_key.data,
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sizeof(sam->LMSessKey.key));
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}
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*_sam = sam;
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return NT_STATUS_OK;
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}
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/* Note that the validity of the _sam3 structure is only as long as
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* the user_info_dc it was generated from */
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NTSTATUS auth_convert_user_info_dc_saminfo3(TALLOC_CTX *mem_ctx,
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struct auth_user_info_dc *user_info_dc,
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struct netr_SamInfo3 **_sam3)
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{
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struct netr_SamBaseInfo *sam;
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struct netr_SamInfo3 *sam3 = talloc_zero(mem_ctx, struct netr_SamInfo3);
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NTSTATUS status;
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size_t i;
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NT_STATUS_HAVE_NO_MEMORY(sam3);
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status = auth_convert_user_info_dc_sambaseinfo(sam3, user_info_dc, &sam);
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if (!NT_STATUS_IS_OK(status)) {
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talloc_free(sam3);
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return status;
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}
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sam3->base = *sam;
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sam3->sidcount = 0;
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sam3->sids = NULL;
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sam3->sids = talloc_array(sam, struct netr_SidAttr,
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user_info_dc->num_sids);
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NT_STATUS_HAVE_NO_MEMORY_AND_FREE(sam3->sids, sam3);
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/* We don't put the user and group SIDs in there */
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for (i=2; i<user_info_dc->num_sids; i++) {
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if (dom_sid_in_domain(sam->domain_sid, &user_info_dc->sids[i])) {
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continue;
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}
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sam3->sids[sam3->sidcount].sid = dom_sid_dup(sam3->sids, &user_info_dc->sids[i]);
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NT_STATUS_HAVE_NO_MEMORY_AND_FREE(sam3->sids[sam3->sidcount].sid, sam3);
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sam3->sids[sam3->sidcount].attributes =
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SE_GROUP_MANDATORY | SE_GROUP_ENABLED_BY_DEFAULT | SE_GROUP_ENABLED;
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sam3->sidcount += 1;
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}
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if (sam3->sidcount) {
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sam3->base.user_flags |= NETLOGON_EXTRA_SIDS;
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} else {
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sam3->sids = NULL;
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}
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*_sam3 = sam3;
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return NT_STATUS_OK;
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}
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/**
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* Make a user_info struct from the info3 or similar returned by a domain logon.
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*
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* The netr_SamInfo3 is also a key structure in the source3 auth subsystem
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*/
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NTSTATUS make_user_info_SamBaseInfo(TALLOC_CTX *mem_ctx,
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const char *account_name,
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struct netr_SamBaseInfo *base,
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bool authenticated,
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struct auth_user_info **_user_info)
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{
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struct auth_user_info *info;
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info = talloc_zero(mem_ctx, struct auth_user_info);
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NT_STATUS_HAVE_NO_MEMORY(info);
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if (base->account_name.string) {
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info->account_name = talloc_strdup(info, base->account_name.string);
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} else {
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info->account_name = talloc_strdup(info, account_name);
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}
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NT_STATUS_HAVE_NO_MEMORY(info->account_name);
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if (base->domain.string) {
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info->domain_name = talloc_strdup(info, base->domain.string);
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NT_STATUS_HAVE_NO_MEMORY(info->domain_name);
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}
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if (base->full_name.string) {
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info->full_name = talloc_strdup(info, base->full_name.string);
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NT_STATUS_HAVE_NO_MEMORY(info->full_name);
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}
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if (base->logon_script.string) {
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info->logon_script = talloc_strdup(info, base->logon_script.string);
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NT_STATUS_HAVE_NO_MEMORY(info->logon_script);
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}
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if (base->profile_path.string) {
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info->profile_path = talloc_strdup(info, base->profile_path.string);
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NT_STATUS_HAVE_NO_MEMORY(info->profile_path);
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}
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if (base->home_directory.string) {
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info->home_directory = talloc_strdup(info, base->home_directory.string);
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NT_STATUS_HAVE_NO_MEMORY(info->home_directory);
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}
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if (base->home_drive.string) {
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info->home_drive = talloc_strdup(info, base->home_drive.string);
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NT_STATUS_HAVE_NO_MEMORY(info->home_drive);
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}
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if (base->logon_server.string) {
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info->logon_server = talloc_strdup(info, base->logon_server.string);
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NT_STATUS_HAVE_NO_MEMORY(info->logon_server);
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}
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info->last_logon = base->last_logon;
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info->last_logoff = base->last_logoff;
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info->acct_expiry = base->acct_expiry;
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info->last_password_change = base->last_password_change;
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info->allow_password_change = base->allow_password_change;
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info->force_password_change = base->force_password_change;
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info->logon_count = base->logon_count;
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info->bad_password_count = base->bad_password_count;
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info->acct_flags = base->acct_flags;
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/* Only set authenticated if both NETLOGON_GUEST is not set, and authenticated is set */
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info->authenticated = (authenticated && (!(base->user_flags & NETLOGON_GUEST)));
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*_user_info = info;
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return NT_STATUS_OK;
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}
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/**
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* Make a user_info_dc struct from the info3 returned by a domain logon
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*/
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NTSTATUS make_user_info_dc_netlogon_validation(TALLOC_CTX *mem_ctx,
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const char *account_name,
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uint16_t validation_level,
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union netr_Validation *validation,
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bool authenticated,
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struct auth_user_info_dc **_user_info_dc)
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{
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NTSTATUS status;
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struct auth_user_info_dc *user_info_dc;
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struct netr_SamBaseInfo *base = NULL;
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uint32_t i;
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switch (validation_level) {
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case 2:
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if (!validation || !validation->sam2) {
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return NT_STATUS_INVALID_PARAMETER;
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}
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base = &validation->sam2->base;
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break;
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case 3:
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if (!validation || !validation->sam3) {
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return NT_STATUS_INVALID_PARAMETER;
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}
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base = &validation->sam3->base;
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break;
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case 6:
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if (!validation || !validation->sam6) {
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return NT_STATUS_INVALID_PARAMETER;
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}
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base = &validation->sam6->base;
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break;
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default:
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return NT_STATUS_INVALID_LEVEL;
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}
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user_info_dc = talloc(mem_ctx, struct auth_user_info_dc);
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NT_STATUS_HAVE_NO_MEMORY(user_info_dc);
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/*
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Here is where we should check the list of
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trusted domains, and verify that the SID
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matches.
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*/
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if (!base->domain_sid) {
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DEBUG(0, ("Cannot operate on a Netlogon Validation without a domain SID"));
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return NT_STATUS_INVALID_PARAMETER;
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}
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/* The IDL layer would be a better place to check this, but to
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* guard the integer addition below, we double-check */
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if (base->groups.count > 65535) {
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return NT_STATUS_INVALID_PARAMETER;
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}
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user_info_dc->num_sids = 2;
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user_info_dc->sids = talloc_array(user_info_dc, struct dom_sid, user_info_dc->num_sids + base->groups.count);
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NT_STATUS_HAVE_NO_MEMORY(user_info_dc->sids);
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user_info_dc->sids[PRIMARY_USER_SID_INDEX] = *base->domain_sid;
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if (!sid_append_rid(&user_info_dc->sids[PRIMARY_USER_SID_INDEX], base->rid)) {
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return NT_STATUS_INVALID_PARAMETER;
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}
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user_info_dc->sids[PRIMARY_GROUP_SID_INDEX] = *base->domain_sid;
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if (!sid_append_rid(&user_info_dc->sids[PRIMARY_GROUP_SID_INDEX], base->primary_gid)) {
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return NT_STATUS_INVALID_PARAMETER;
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}
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for (i = 0; i < base->groups.count; i++) {
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user_info_dc->sids[user_info_dc->num_sids] = *base->domain_sid;
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if (!sid_append_rid(&user_info_dc->sids[user_info_dc->num_sids], base->groups.rids[i].rid)) {
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return NT_STATUS_INVALID_PARAMETER;
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}
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user_info_dc->num_sids++;
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}
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/* Copy 'other' sids. We need to do sid filtering here to
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prevent possible elevation of privileges. See:
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http://www.microsoft.com/windows2000/techinfo/administration/security/sidfilter.asp
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*/
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if (validation_level == 3) {
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struct dom_sid *dgrps = user_info_dc->sids;
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size_t sidcount;
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/* The IDL layer would be a better place to check this, but to
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* guard the integer addition below, we double-check */
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if (validation->sam3->sidcount > 65535) {
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return NT_STATUS_INVALID_PARAMETER;
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}
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sidcount = user_info_dc->num_sids + validation->sam3->sidcount;
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if (validation->sam3->sidcount > 0) {
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dgrps = talloc_realloc(user_info_dc, dgrps, struct dom_sid, sidcount);
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NT_STATUS_HAVE_NO_MEMORY(dgrps);
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for (i = 0; i < validation->sam3->sidcount; i++) {
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if (validation->sam3->sids[i].sid) {
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dgrps[user_info_dc->num_sids] = *validation->sam3->sids[i].sid;
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user_info_dc->num_sids++;
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}
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}
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}
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user_info_dc->sids = dgrps;
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/* Where are the 'global' sids?... */
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}
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status = make_user_info_SamBaseInfo(user_info_dc, account_name, base, authenticated, &user_info_dc->info);
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if (!NT_STATUS_IS_OK(status)) {
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return status;
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}
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/* ensure we are never given NULL session keys */
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if (all_zero(base->key.key, sizeof(base->key.key))) {
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user_info_dc->user_session_key = data_blob(NULL, 0);
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} else {
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user_info_dc->user_session_key = data_blob_talloc(user_info_dc, base->key.key, sizeof(base->key.key));
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NT_STATUS_HAVE_NO_MEMORY(user_info_dc->user_session_key.data);
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}
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if (all_zero(base->LMSessKey.key, sizeof(base->LMSessKey.key))) {
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user_info_dc->lm_session_key = data_blob(NULL, 0);
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} else {
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user_info_dc->lm_session_key = data_blob_talloc(user_info_dc, base->LMSessKey.key, sizeof(base->LMSessKey.key));
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NT_STATUS_HAVE_NO_MEMORY(user_info_dc->lm_session_key.data);
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}
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*_user_info_dc = user_info_dc;
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return NT_STATUS_OK;
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}
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/**
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* Make a user_info_dc struct from the PAC_LOGON_INFO supplied in the krb5 logon
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*/
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NTSTATUS make_user_info_dc_pac(TALLOC_CTX *mem_ctx,
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struct PAC_LOGON_INFO *pac_logon_info,
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struct auth_user_info_dc **_user_info_dc)
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{
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uint32_t i;
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NTSTATUS nt_status;
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union netr_Validation validation;
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struct auth_user_info_dc *user_info_dc;
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validation.sam3 = &pac_logon_info->info3;
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nt_status = make_user_info_dc_netlogon_validation(mem_ctx, "", 3, &validation,
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true, /* This user was authenticated */
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&user_info_dc);
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if (!NT_STATUS_IS_OK(nt_status)) {
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return nt_status;
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}
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if (pac_logon_info->res_groups.count > 0) {
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size_t sidcount;
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/* The IDL layer would be a better place to check this, but to
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* guard the integer addition below, we double-check */
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if (pac_logon_info->res_groups.count > 65535) {
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talloc_free(user_info_dc);
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return NT_STATUS_INVALID_PARAMETER;
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}
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/*
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Here is where we should check the list of
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trusted domains, and verify that the SID
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matches.
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*/
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if (!pac_logon_info->res_group_dom_sid) {
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DEBUG(0, ("Cannot operate on a PAC without a resource domain SID"));
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return NT_STATUS_INVALID_PARAMETER;
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}
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sidcount = user_info_dc->num_sids + pac_logon_info->res_groups.count;
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user_info_dc->sids
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= talloc_realloc(user_info_dc, user_info_dc->sids, struct dom_sid, sidcount);
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NT_STATUS_HAVE_NO_MEMORY_AND_FREE(user_info_dc->sids, user_info_dc);
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for (i = 0; pac_logon_info->res_group_dom_sid && i < pac_logon_info->res_groups.count; i++) {
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user_info_dc->sids[user_info_dc->num_sids] = *pac_logon_info->res_group_dom_sid;
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if (!sid_append_rid(&user_info_dc->sids[user_info_dc->num_sids],
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pac_logon_info->res_groups.rids[i].rid)) {
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return NT_STATUS_INVALID_PARAMETER;
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}
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user_info_dc->num_sids++;
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}
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}
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*_user_info_dc = user_info_dc;
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return NT_STATUS_OK;
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}
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