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samba-mirror/source3/auth/server_info.c
Joseph Sutton 5147f011d9 auth: Shorten long SID flags combinations
The combination MANDATORY | ENABLED_BY_DEFAULT | ENABLED is very
commonly used, and introducing a shorter alias for it makes the code
clearer.

Signed-off-by: Joseph Sutton <josephsutton@catalyst.net.nz>
Reviewed-by: Andrew Bartlett <abartlet@samba.org>
2023-02-08 00:03:39 +00:00

790 lines
21 KiB
C

/*
Unix SMB/CIFS implementation.
Authentication utility functions
Copyright (C) Volker Lendecke 2010
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.h"
#include "lib/util_unixsids.h"
#include "../librpc/gen_ndr/netlogon.h"
#include "../libcli/security/security.h"
#include "rpc_client/util_netlogon.h"
#include "nsswitch/libwbclient/wbclient.h"
#include "lib/winbind_util.h"
#include "passdb.h"
#undef DBGC_CLASS
#define DBGC_CLASS DBGC_AUTH
/***************************************************************************
Make a server_info struct. Free with TALLOC_FREE().
***************************************************************************/
struct auth_serversupplied_info *make_server_info(TALLOC_CTX *mem_ctx)
{
struct auth_serversupplied_info *result;
result = talloc_zero(mem_ctx, struct auth_serversupplied_info);
if (result == NULL) {
DEBUG(0, ("talloc failed\n"));
return NULL;
}
/* Initialise the uid and gid values to something non-zero
which may save us from giving away root access if there
is a bug in allocating these fields. */
result->utok.uid = -1;
result->utok.gid = -1;
return result;
}
/****************************************************************************
inits a netr_SamInfo2 structure from an auth_serversupplied_info. sam2 must
already be initialized and is used as the talloc parent for its members.
*****************************************************************************/
NTSTATUS serverinfo_to_SamInfo2(struct auth_serversupplied_info *server_info,
struct netr_SamInfo2 *sam2)
{
struct netr_SamInfo3 *info3 = NULL;
NTSTATUS status;
status = copy_netr_SamInfo3(sam2,
server_info->info3,
&info3);
if (!NT_STATUS_IS_OK(status)) {
return status;
}
if (server_info->session_key.length) {
memcpy(info3->base.key.key,
server_info->session_key.data,
MIN(sizeof(info3->base.key.key),
server_info->session_key.length));
}
if (server_info->lm_session_key.length) {
memcpy(info3->base.LMSessKey.key,
server_info->lm_session_key.data,
MIN(sizeof(info3->base.LMSessKey.key),
server_info->lm_session_key.length));
}
sam2->base = info3->base;
return NT_STATUS_OK;
}
/****************************************************************************
inits a netr_SamInfo3 structure from an auth_serversupplied_info. sam3 must
already be initialized and is used as the talloc parent for its members.
*****************************************************************************/
NTSTATUS serverinfo_to_SamInfo3(const struct auth_serversupplied_info *server_info,
struct netr_SamInfo3 *sam3)
{
struct netr_SamInfo3 *info3 = NULL;
NTSTATUS status;
status = copy_netr_SamInfo3(sam3,
server_info->info3,
&info3);
if (!NT_STATUS_IS_OK(status)) {
return status;
}
if (server_info->session_key.length) {
memcpy(info3->base.key.key,
server_info->session_key.data,
MIN(sizeof(info3->base.key.key),
server_info->session_key.length));
}
if (server_info->lm_session_key.length) {
memcpy(info3->base.LMSessKey.key,
server_info->lm_session_key.data,
MIN(sizeof(info3->base.LMSessKey.key),
server_info->lm_session_key.length));
}
sam3->base = info3->base;
sam3->sidcount = 0;
sam3->sids = NULL;
return NT_STATUS_OK;
}
/****************************************************************************
inits a netr_SamInfo6 structure from an auth_serversupplied_info. sam6 must
already be initialized and is used as the talloc parent for its members.
*****************************************************************************/
NTSTATUS serverinfo_to_SamInfo6(struct auth_serversupplied_info *server_info,
struct netr_SamInfo6 *sam6)
{
struct pdb_domain_info *dominfo;
struct netr_SamInfo3 *info3 = NULL;
NTSTATUS status;
if ((pdb_capabilities() & PDB_CAP_ADS) == 0) {
DEBUG(10,("Not adding validation info level 6 "
"without ADS passdb backend\n"));
return NT_STATUS_INVALID_INFO_CLASS;
}
dominfo = pdb_get_domain_info(sam6);
if (dominfo == NULL) {
return NT_STATUS_NO_MEMORY;
}
status = copy_netr_SamInfo3(sam6,
server_info->info3,
&info3);
if (!NT_STATUS_IS_OK(status)) {
return status;
}
if (server_info->session_key.length) {
memcpy(info3->base.key.key,
server_info->session_key.data,
MIN(sizeof(info3->base.key.key),
server_info->session_key.length));
}
if (server_info->lm_session_key.length) {
memcpy(info3->base.LMSessKey.key,
server_info->lm_session_key.data,
MIN(sizeof(info3->base.LMSessKey.key),
server_info->lm_session_key.length));
}
sam6->base = info3->base;
sam6->sidcount = 0;
sam6->sids = NULL;
sam6->dns_domainname.string = talloc_strdup(sam6, dominfo->dns_domain);
if (sam6->dns_domainname.string == NULL) {
return NT_STATUS_NO_MEMORY;
}
sam6->principal_name.string = talloc_asprintf(
sam6, "%s@%s", sam6->base.account_name.string,
sam6->dns_domainname.string);
if (sam6->principal_name.string == NULL) {
return NT_STATUS_NO_MEMORY;
}
return NT_STATUS_OK;
}
static NTSTATUS append_netr_SidAttr(TALLOC_CTX *mem_ctx,
struct netr_SidAttr **sids,
uint32_t *count,
const struct dom_sid2 *asid,
uint32_t attributes)
{
uint32_t t = *count;
*sids = talloc_realloc(mem_ctx, *sids, struct netr_SidAttr, t + 1);
if (*sids == NULL) {
return NT_STATUS_NO_MEMORY;
}
(*sids)[t].sid = dom_sid_dup(*sids, asid);
if ((*sids)[t].sid == NULL) {
return NT_STATUS_NO_MEMORY;
}
(*sids)[t].attributes = attributes;
*count = t + 1;
return NT_STATUS_OK;
}
/* Fills the samr_RidWithAttributeArray with the provided sids.
* If it happens that we have additional groups that do not belong
* to the domain, add their sids as extra sids */
static NTSTATUS group_sids_to_info3(struct netr_SamInfo3 *info3,
const struct dom_sid *sids,
size_t num_sids)
{
uint32_t attributes = SE_GROUP_DEFAULT_FLAGS;
struct samr_RidWithAttributeArray *groups;
struct dom_sid *domain_sid;
unsigned int i;
NTSTATUS status;
uint32_t rid;
bool ok;
domain_sid = info3->base.domain_sid;
groups = &info3->base.groups;
groups->rids = talloc_array(info3,
struct samr_RidWithAttribute, num_sids);
if (!groups->rids) {
return NT_STATUS_NO_MEMORY;
}
for (i = 0; i < num_sids; i++) {
ok = sid_peek_check_rid(domain_sid, &sids[i], &rid);
if (ok) {
/* store domain group rid */
groups->rids[groups->count].rid = rid;
groups->rids[groups->count].attributes = attributes;
groups->count++;
continue;
}
/* if this wasn't a domain sid, add it as extra sid */
status = append_netr_SidAttr(info3, &info3->sids,
&info3->sidcount,
&sids[i], attributes);
if (!NT_STATUS_IS_OK(status)) {
return status;
}
}
return NT_STATUS_OK;
}
/*
* Merge resource SIDs, if any, into the passed in info3 structure.
*/
static NTSTATUS merge_resource_sids(const struct PAC_LOGON_INFO *logon_info,
struct netr_SamInfo3 *info3)
{
uint32_t i = 0;
const struct PAC_DOMAIN_GROUP_MEMBERSHIP *rg = NULL;
if (logon_info->info3.base.user_flags & NETLOGON_RESOURCE_GROUPS) {
rg = &logon_info->resource_groups;
}
if (rg == NULL) {
return NT_STATUS_OK;
}
if (rg->domain_sid == NULL) {
DEBUG(10, ("Missing Resource Group Domain SID\n"));
return NT_STATUS_INVALID_PARAMETER;
}
/* The IDL layer would be a better place to check this, but to
* guard the integer addition below, we double-check */
if (rg->groups.count > 65535) {
DEBUG(10, ("Too much Resource Group RIDs %u\n",
(unsigned)rg->groups.count));
return NT_STATUS_INVALID_PARAMETER;
}
/*
* If there are any resource groups (SID Compression) add
* them to the extra sids portion of the info3 in the PAC.
*
* This makes the info3 look like it would if we got the info
* from the DC rather than the PAC.
*/
/*
* Construct a SID for each RID in the list and then append it
* to the info3.
*/
for (i = 0; i < rg->groups.count; i++) {
NTSTATUS status;
struct dom_sid new_sid;
uint32_t attributes = rg->groups.rids[i].attributes;
struct dom_sid_buf buf;
sid_compose(&new_sid,
rg->domain_sid,
rg->groups.rids[i].rid);
DEBUG(10, ("Adding SID %s to extra SIDS\n",
dom_sid_str_buf(&new_sid, &buf)));
status = append_netr_SidAttr(info3, &info3->sids,
&info3->sidcount,
&new_sid,
attributes);
if (!NT_STATUS_IS_OK(status)) {
DEBUG(1, ("failed to append SID %s to extra SIDS: %s\n",
dom_sid_str_buf(&new_sid, &buf),
nt_errstr(status)));
return status;
}
}
return NT_STATUS_OK;
}
/*
* Create a copy of an info3 struct from the struct PAC_LOGON_INFO,
* then merge resource SIDs, if any, into it. If successful return
* the created info3 struct.
*/
NTSTATUS create_info3_from_pac_logon_info(TALLOC_CTX *mem_ctx,
const struct PAC_LOGON_INFO *logon_info,
struct netr_SamInfo3 **pp_info3)
{
NTSTATUS status;
struct netr_SamInfo3 *info3 = NULL;
status = copy_netr_SamInfo3(mem_ctx,
&logon_info->info3,
&info3);
if (!NT_STATUS_IS_OK(status)) {
return status;
}
status = merge_resource_sids(logon_info, info3);
if (!NT_STATUS_IS_OK(status)) {
TALLOC_FREE(info3);
return status;
}
*pp_info3 = info3;
return NT_STATUS_OK;
}
/*
* Create a copy of an info6 struct from the PAC_UPN_DNS_INFO and PAC_LOGON_INFO
* then merge resource SIDs, if any, into it. If successful return the created
* info6 struct.
*/
NTSTATUS create_info6_from_pac(TALLOC_CTX *mem_ctx,
const struct PAC_LOGON_INFO *logon_info,
const struct PAC_UPN_DNS_INFO *upn_dns_info,
struct netr_SamInfo6 **pp_info6)
{
NTSTATUS status;
struct netr_SamInfo6 *info6 = NULL;
struct netr_SamInfo3 *info3 = NULL;
info6 = talloc_zero(mem_ctx, struct netr_SamInfo6);
if (info6 == NULL) {
return NT_STATUS_NO_MEMORY;
}
status = copy_netr_SamInfo3(info6,
&logon_info->info3,
&info3);
if (!NT_STATUS_IS_OK(status)) {
TALLOC_FREE(info6);
return status;
}
status = merge_resource_sids(logon_info, info3);
if (!NT_STATUS_IS_OK(status)) {
TALLOC_FREE(info6);
return status;
}
info6->base = info3->base;
info6->sids = info3->sids;
info6->sidcount = info3->sidcount;
if (upn_dns_info != NULL) {
info6->dns_domainname.string = talloc_strdup(info6,
upn_dns_info->dns_domain_name);
if (info6->dns_domainname.string == NULL) {
TALLOC_FREE(info6);
return NT_STATUS_NO_MEMORY;
}
info6->principal_name.string = talloc_strdup(info6,
upn_dns_info->upn_name);
if (info6->principal_name.string == NULL) {
TALLOC_FREE(info6);
return NT_STATUS_NO_MEMORY;
}
}
*pp_info6 = info6;
return NT_STATUS_OK;
}
/*
* Check if this is a "Unix Users" domain user, or a
* "Unix Groups" domain group, we need to handle it
* in a special way if that's the case.
*/
static NTSTATUS SamInfo3_handle_sids(const char *username,
const struct dom_sid *user_sid,
const struct dom_sid *group_sid,
struct netr_SamInfo3 *info3,
struct dom_sid *domain_sid,
struct extra_auth_info *extra)
{
struct dom_sid_buf buf;
if (sid_check_is_in_unix_users(user_sid)) {
/* in info3 you can only set rids for the user and the
* primary group, and the domain sid must be that of
* the sam domain.
*
* Store a completely bogus value here.
* The real SID is stored in the extra sids.
* Other code will know to look there if (-1) is found
*/
info3->base.rid = (uint32_t)(-1);
sid_copy(&extra->user_sid, user_sid);
DEBUG(10, ("Unix User found. Rid marked as "
"special and sid (%s) saved as extra sid\n",
dom_sid_str_buf(user_sid, &buf)));
} else {
sid_copy(domain_sid, user_sid);
sid_split_rid(domain_sid, &info3->base.rid);
}
if (is_null_sid(domain_sid)) {
sid_copy(domain_sid, get_global_sam_sid());
}
/* check if this is a "Unix Groups" domain group,
* if so we need special handling */
if (sid_check_is_in_unix_groups(group_sid)) {
/* in info3 you can only set rids for the user and the
* primary group, and the domain sid must be that of
* the sam domain.
*
* Store a completely bogus value here.
* The real SID is stored in the extra sids.
* Other code will know to look there if (-1) is found
*/
info3->base.primary_gid = (uint32_t)(-1);
sid_copy(&extra->pgid_sid, group_sid);
DEBUG(10, ("Unix Group found. Rid marked as "
"special and sid (%s) saved as extra sid\n",
dom_sid_str_buf(group_sid, &buf)));
} else {
bool ok = sid_peek_check_rid(domain_sid, group_sid,
&info3->base.primary_gid);
if (!ok) {
struct dom_sid_buf buf2, buf3;
DEBUG(1, ("The primary group domain sid(%s) does not "
"match the domain sid(%s) for %s(%s)\n",
dom_sid_str_buf(group_sid, &buf),
dom_sid_str_buf(domain_sid, &buf2),
username,
dom_sid_str_buf(user_sid, &buf3)));
return NT_STATUS_INVALID_SID;
}
}
return NT_STATUS_OK;
}
#define RET_NOMEM(ptr) do { \
if (!ptr) { \
TALLOC_FREE(info3); \
return NT_STATUS_NO_MEMORY; \
} } while(0)
NTSTATUS samu_to_SamInfo3(TALLOC_CTX *mem_ctx,
struct samu *samu,
const char *login_server,
struct netr_SamInfo3 **_info3,
struct extra_auth_info *extra)
{
struct netr_SamInfo3 *info3;
const struct dom_sid *user_sid;
const struct dom_sid *group_sid;
struct dom_sid domain_sid = {0};
struct dom_sid *group_sids;
uint32_t num_group_sids = 0;
const char *tmp;
gid_t *gids;
NTSTATUS status;
user_sid = pdb_get_user_sid(samu);
group_sid = pdb_get_group_sid(samu);
if (!user_sid || !group_sid) {
DEBUG(1, ("Sam account is missing sids!\n"));
return NT_STATUS_UNSUCCESSFUL;
}
info3 = talloc_zero(mem_ctx, struct netr_SamInfo3);
if (!info3) {
return NT_STATUS_NO_MEMORY;
}
status = SamInfo3_handle_sids(pdb_get_username(samu),
user_sid,
group_sid,
info3,
&domain_sid,
extra);
if (!NT_STATUS_IS_OK(status)) {
TALLOC_FREE(info3);
return status;
}
unix_to_nt_time(&info3->base.logon_time, pdb_get_logon_time(samu));
unix_to_nt_time(&info3->base.logoff_time, get_time_t_max());
unix_to_nt_time(&info3->base.kickoff_time, get_time_t_max());
unix_to_nt_time(&info3->base.last_password_change,
pdb_get_pass_last_set_time(samu));
unix_to_nt_time(&info3->base.allow_password_change,
pdb_get_pass_can_change_time(samu));
unix_to_nt_time(&info3->base.force_password_change,
pdb_get_pass_must_change_time(samu));
tmp = pdb_get_username(samu);
if (tmp) {
info3->base.account_name.string = talloc_strdup(info3, tmp);
RET_NOMEM(info3->base.account_name.string);
}
tmp = pdb_get_fullname(samu);
if (tmp) {
info3->base.full_name.string = talloc_strdup(info3, tmp);
RET_NOMEM(info3->base.full_name.string);
}
tmp = pdb_get_logon_script(samu);
if (tmp) {
info3->base.logon_script.string = talloc_strdup(info3, tmp);
RET_NOMEM(info3->base.logon_script.string);
}
tmp = pdb_get_profile_path(samu);
if (tmp) {
info3->base.profile_path.string = talloc_strdup(info3, tmp);
RET_NOMEM(info3->base.profile_path.string);
}
tmp = pdb_get_homedir(samu);
if (tmp) {
info3->base.home_directory.string = talloc_strdup(info3, tmp);
RET_NOMEM(info3->base.home_directory.string);
}
tmp = pdb_get_dir_drive(samu);
if (tmp) {
info3->base.home_drive.string = talloc_strdup(info3, tmp);
RET_NOMEM(info3->base.home_drive.string);
}
info3->base.logon_count = pdb_get_logon_count(samu);
info3->base.bad_password_count = pdb_get_bad_password_count(samu);
info3->base.logon_domain.string = talloc_strdup(info3,
pdb_get_domain(samu));
RET_NOMEM(info3->base.logon_domain.string);
info3->base.domain_sid = dom_sid_dup(info3, &domain_sid);
RET_NOMEM(info3->base.domain_sid);
status = pdb_enum_group_memberships(mem_ctx, samu,
&group_sids, &gids,
&num_group_sids);
if (!NT_STATUS_IS_OK(status)) {
DEBUG(1, ("Failed to get groups from sam account.\n"));
TALLOC_FREE(info3);
return status;
}
if (num_group_sids) {
status = group_sids_to_info3(info3, group_sids, num_group_sids);
if (!NT_STATUS_IS_OK(status)) {
TALLOC_FREE(info3);
return status;
}
}
/* We don't need sids and gids after the conversion */
TALLOC_FREE(group_sids);
TALLOC_FREE(gids);
num_group_sids = 0;
/* FIXME: should we add other flags ? */
info3->base.user_flags = NETLOGON_EXTRA_SIDS;
if (login_server) {
info3->base.logon_server.string = talloc_strdup(info3, login_server);
RET_NOMEM(info3->base.logon_server.string);
}
info3->base.acct_flags = pdb_get_acct_ctrl(samu);
*_info3 = info3;
return NT_STATUS_OK;
}
NTSTATUS passwd_to_SamInfo3(TALLOC_CTX *mem_ctx,
const char *unix_username,
const struct passwd *pwd,
struct netr_SamInfo3 **pinfo3,
struct extra_auth_info *extra)
{
struct netr_SamInfo3 *info3;
NTSTATUS status;
TALLOC_CTX *tmp_ctx;
const char *domain_name = NULL;
const char *user_name = NULL;
struct dom_sid domain_sid;
struct dom_sid user_sid;
struct dom_sid group_sid;
enum lsa_SidType type;
uint32_t num_sids = 0;
struct dom_sid *user_sids = NULL;
bool is_null;
bool ok;
tmp_ctx = talloc_stackframe();
ok = lookup_name_smbconf(tmp_ctx,
unix_username,
LOOKUP_NAME_ALL,
&domain_name,
&user_name,
&user_sid,
&type);
if (!ok) {
status = NT_STATUS_NO_SUCH_USER;
goto done;
}
if (type != SID_NAME_USER) {
status = NT_STATUS_NO_SUCH_USER;
goto done;
}
ok = winbind_lookup_usersids(tmp_ctx,
&user_sid,
&num_sids,
&user_sids);
/* Check if winbind is running */
if (ok) {
/*
* Winbind is running and the first element of the user_sids
* is the primary group.
*/
if (num_sids > 0) {
group_sid = user_sids[0];
}
} else {
/*
* Winbind is not running, try to create the group_sid from the
* passwd group id.
*/
/*
* This can lead to a primary group of S-1-22-2-XX which
* will be rejected by other Samba code.
*/
gid_to_sid(&group_sid, pwd->pw_gid);
}
/*
* If we are a unix group, or a wellknown/builtin alias,
* set the group_sid to the
* 'Domain Users' RID of 513 which will always resolve to a
* name.
*/
if (sid_check_is_in_unix_groups(&group_sid) ||
sid_check_is_in_builtin(&group_sid) ||
sid_check_is_in_wellknown_domain(&group_sid)) {
if (sid_check_is_in_unix_users(&user_sid)) {
sid_compose(&group_sid,
get_global_sam_sid(),
DOMAIN_RID_USERS);
} else {
sid_copy(&domain_sid, &user_sid);
sid_split_rid(&domain_sid, NULL);
sid_compose(&group_sid,
&domain_sid,
DOMAIN_RID_USERS);
}
}
/* Make sure we have a valid group sid */
is_null = is_null_sid(&group_sid);
if (is_null) {
status = NT_STATUS_NO_SUCH_USER;
goto done;
}
/* Construct a netr_SamInfo3 from the information we have */
info3 = talloc_zero(tmp_ctx, struct netr_SamInfo3);
if (!info3) {
status = NT_STATUS_NO_MEMORY;
goto done;
}
info3->base.account_name.string = talloc_strdup(info3, unix_username);
if (info3->base.account_name.string == NULL) {
status = NT_STATUS_NO_MEMORY;
goto done;
}
info3->base.logon_domain.string = talloc_strdup(info3, domain_name);
if (info3->base.logon_domain.string == NULL) {
status = NT_STATUS_NO_MEMORY;
goto done;
}
ZERO_STRUCT(domain_sid);
status = SamInfo3_handle_sids(unix_username,
&user_sid,
&group_sid,
info3,
&domain_sid,
extra);
if (!NT_STATUS_IS_OK(status)) {
goto done;
}
info3->base.domain_sid = dom_sid_dup(info3, &domain_sid);
if (info3->base.domain_sid == NULL) {
status = NT_STATUS_NO_MEMORY;
goto done;
}
ok = sid_peek_check_rid(&domain_sid, &group_sid,
&info3->base.primary_gid);
if (!ok) {
struct dom_sid_buf buf1, buf2, buf3;
DEBUG(1, ("The primary group domain sid(%s) does not "
"match the domain sid(%s) for %s(%s)\n",
dom_sid_str_buf(&group_sid, &buf1),
dom_sid_str_buf(&domain_sid, &buf2),
unix_username,
dom_sid_str_buf(&user_sid, &buf3)));
status = NT_STATUS_INVALID_SID;
goto done;
}
info3->base.acct_flags = ACB_NORMAL;
if (num_sids) {
status = group_sids_to_info3(info3, user_sids, num_sids);
if (!NT_STATUS_IS_OK(status)) {
goto done;
}
}
*pinfo3 = talloc_move(mem_ctx, &info3);
status = NT_STATUS_OK;
done:
talloc_free(tmp_ctx);
return status;
}