/samba-3.5.6/source3/auth/token_util.c
C | 561 lines | 363 code | 104 blank | 94 comment | 72 complexity | e3a87e1cdc70b82f6e9ac16d5eeaf877 MD5 | raw file
- /*
- * Unix SMB/CIFS implementation.
- * Authentication utility functions
- * Copyright (C) Andrew Tridgell 1992-1998
- * Copyright (C) Andrew Bartlett 2001
- * Copyright (C) Jeremy Allison 2000-2001
- * Copyright (C) Rafal Szczesniak 2002
- * Copyright (C) Volker Lendecke 2006
- * Copyright (C) Michael Adam 2007
- *
- * 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/>.
- */
- /* functions moved from auth/auth_util.c to minimize linker deps */
- #include "includes.h"
- /****************************************************************************
- Check for a SID in an NT_USER_TOKEN
- ****************************************************************************/
- bool nt_token_check_sid ( const DOM_SID *sid, const NT_USER_TOKEN *token )
- {
- int i;
- if ( !sid || !token )
- return False;
- for ( i=0; i<token->num_sids; i++ ) {
- if ( sid_equal( sid, &token->user_sids[i] ) )
- return True;
- }
- return False;
- }
- bool nt_token_check_domain_rid( NT_USER_TOKEN *token, uint32 rid )
- {
- DOM_SID domain_sid;
- /* if we are a domain member, the get the domain SID, else for
- a DC or standalone server, use our own SID */
- if ( lp_server_role() == ROLE_DOMAIN_MEMBER ) {
- if ( !secrets_fetch_domain_sid( lp_workgroup(),
- &domain_sid ) ) {
- DEBUG(1,("nt_token_check_domain_rid: Cannot lookup "
- "SID for domain [%s]\n", lp_workgroup()));
- return False;
- }
- }
- else
- sid_copy( &domain_sid, get_global_sam_sid() );
- sid_append_rid( &domain_sid, rid );
- return nt_token_check_sid( &domain_sid, token );\
- }
- /******************************************************************************
- Create a token for the root user to be used internally by smbd.
- This is similar to running under the context of the LOCAL_SYSTEM account
- in Windows. This is a read-only token. Do not modify it or free() it.
- Create a copy if your need to change it.
- ******************************************************************************/
- NT_USER_TOKEN *get_root_nt_token( void )
- {
- struct nt_user_token *token, *for_cache;
- DOM_SID u_sid, g_sid;
- struct passwd *pw;
- void *cache_data;
- cache_data = memcache_lookup_talloc(
- NULL, SINGLETON_CACHE_TALLOC,
- data_blob_string_const_null("root_nt_token"));
- if (cache_data != NULL) {
- return talloc_get_type_abort(
- cache_data, struct nt_user_token);
- }
- if ( !(pw = sys_getpwuid(0)) ) {
- if ( !(pw = sys_getpwnam("root")) ) {
- DEBUG(0,("get_root_nt_token: both sys_getpwuid(0) "
- "and sys_getpwnam(\"root\") failed!\n"));
- return NULL;
- }
- }
- /* get the user and primary group SIDs; although the
- BUILTIN\Administrators SId is really the one that matters here */
- uid_to_sid(&u_sid, pw->pw_uid);
- gid_to_sid(&g_sid, pw->pw_gid);
- token = create_local_nt_token(talloc_autofree_context(), &u_sid, False,
- 1, &global_sid_Builtin_Administrators);
- token->privileges = se_disk_operators;
- for_cache = token;
- memcache_add_talloc(
- NULL, SINGLETON_CACHE_TALLOC,
- data_blob_string_const_null("root_nt_token"), &for_cache);
- return token;
- }
- /*
- * Add alias SIDs from memberships within the partially created token SID list
- */
- NTSTATUS add_aliases(const DOM_SID *domain_sid,
- struct nt_user_token *token)
- {
- uint32 *aliases;
- size_t i, num_aliases;
- NTSTATUS status;
- TALLOC_CTX *tmp_ctx;
- if (!(tmp_ctx = talloc_init("add_aliases"))) {
- return NT_STATUS_NO_MEMORY;
- }
- aliases = NULL;
- num_aliases = 0;
- status = pdb_enum_alias_memberships(tmp_ctx, domain_sid,
- token->user_sids,
- token->num_sids,
- &aliases, &num_aliases);
- if (!NT_STATUS_IS_OK(status)) {
- DEBUG(10, ("pdb_enum_alias_memberships failed: %s\n",
- nt_errstr(status)));
- goto done;
- }
- for (i=0; i<num_aliases; i++) {
- DOM_SID alias_sid;
- sid_compose(&alias_sid, domain_sid, aliases[i]);
- status = add_sid_to_array_unique(token, &alias_sid,
- &token->user_sids,
- &token->num_sids);
- if (!NT_STATUS_IS_OK(status)) {
- DEBUG(0, ("add_sid_to_array failed\n"));
- goto done;
- }
- }
- done:
- TALLOC_FREE(tmp_ctx);
- return NT_STATUS_OK;
- }
- /*******************************************************************
- *******************************************************************/
- static NTSTATUS add_builtin_administrators(struct nt_user_token *token,
- const DOM_SID *dom_sid)
- {
- DOM_SID domadm;
- NTSTATUS status;
- /* nothing to do if we aren't in a domain */
- if ( !(IS_DC || lp_server_role()==ROLE_DOMAIN_MEMBER) ) {
- return NT_STATUS_OK;
- }
- /* Find the Domain Admins SID */
- if ( IS_DC ) {
- sid_copy( &domadm, get_global_sam_sid() );
- } else {
- sid_copy(&domadm, dom_sid);
- }
- sid_append_rid( &domadm, DOMAIN_GROUP_RID_ADMINS );
- /* Add Administrators if the user beloongs to Domain Admins */
- if ( nt_token_check_sid( &domadm, token ) ) {
- status = add_sid_to_array(token,
- &global_sid_Builtin_Administrators,
- &token->user_sids, &token->num_sids);
- if (!NT_STATUS_IS_OK(status)) {
- return status;
- }
- }
- return NT_STATUS_OK;
- }
- /**
- * Create the requested BUILTIN if it doesn't already exist. This requires
- * winbindd to be running.
- *
- * @param[in] rid BUILTIN rid to create
- * @return Normal NTSTATUS return.
- */
- static NTSTATUS create_builtin(uint32 rid)
- {
- NTSTATUS status = NT_STATUS_OK;
- DOM_SID sid;
- gid_t gid;
- if (!sid_compose(&sid, &global_sid_Builtin, rid)) {
- return NT_STATUS_NO_SUCH_ALIAS;
- }
- if (!sid_to_gid(&sid, &gid)) {
- if (!lp_winbind_nested_groups() || !winbind_ping()) {
- return NT_STATUS_PROTOCOL_UNREACHABLE;
- }
- status = pdb_create_builtin_alias(rid);
- }
- return status;
- }
- /**
- * Add sid as a member of builtin_sid.
- *
- * @param[in] builtin_sid An existing builtin group.
- * @param[in] dom_sid sid to add as a member of builtin_sid.
- * @return Normal NTSTATUS return
- */
- static NTSTATUS add_sid_to_builtin(const DOM_SID *builtin_sid,
- const DOM_SID *dom_sid)
- {
- NTSTATUS status = NT_STATUS_OK;
- if (!dom_sid || !builtin_sid) {
- return NT_STATUS_INVALID_PARAMETER;
- }
- status = pdb_add_aliasmem(builtin_sid, dom_sid);
- if (NT_STATUS_EQUAL(status, NT_STATUS_MEMBER_IN_ALIAS)) {
- DEBUG(5, ("add_sid_to_builtin %s is already a member of %s\n",
- sid_string_dbg(dom_sid),
- sid_string_dbg(builtin_sid)));
- return NT_STATUS_OK;
- }
- if (!NT_STATUS_IS_OK(status)) {
- DEBUG(4, ("add_sid_to_builtin %s could not be added to %s: "
- "%s\n", sid_string_dbg(dom_sid),
- sid_string_dbg(builtin_sid), nt_errstr(status)));
- }
- return status;
- }
- /*******************************************************************
- *******************************************************************/
- NTSTATUS create_builtin_users(const DOM_SID *dom_sid)
- {
- NTSTATUS status;
- DOM_SID dom_users;
- status = create_builtin(BUILTIN_ALIAS_RID_USERS);
- if ( !NT_STATUS_IS_OK(status) ) {
- DEBUG(5,("create_builtin_users: Failed to create Users\n"));
- return status;
- }
- /* add domain users */
- if ((IS_DC || (lp_server_role() == ROLE_DOMAIN_MEMBER))
- && sid_compose(&dom_users, dom_sid, DOMAIN_GROUP_RID_USERS))
- {
- status = add_sid_to_builtin(&global_sid_Builtin_Users,
- &dom_users);
- }
- return status;
- }
- /*******************************************************************
- *******************************************************************/
- NTSTATUS create_builtin_administrators(const DOM_SID *dom_sid)
- {
- NTSTATUS status;
- DOM_SID dom_admins, root_sid;
- fstring root_name;
- enum lsa_SidType type;
- TALLOC_CTX *ctx;
- bool ret;
- status = create_builtin(BUILTIN_ALIAS_RID_ADMINS);
- if ( !NT_STATUS_IS_OK(status) ) {
- DEBUG(5,("create_builtin_administrators: Failed to create Administrators\n"));
- return status;
- }
- /* add domain admins */
- if ((IS_DC || (lp_server_role() == ROLE_DOMAIN_MEMBER))
- && sid_compose(&dom_admins, dom_sid, DOMAIN_GROUP_RID_ADMINS))
- {
- status = add_sid_to_builtin(&global_sid_Builtin_Administrators,
- &dom_admins);
- if (!NT_STATUS_IS_OK(status)) {
- return status;
- }
- }
- /* add root */
- if ( (ctx = talloc_init("create_builtin_administrators")) == NULL ) {
- return NT_STATUS_NO_MEMORY;
- }
- fstr_sprintf( root_name, "%s\\root", get_global_sam_name() );
- ret = lookup_name(ctx, root_name, LOOKUP_NAME_DOMAIN, NULL, NULL,
- &root_sid, &type);
- TALLOC_FREE( ctx );
- if ( ret ) {
- status = add_sid_to_builtin(&global_sid_Builtin_Administrators,
- &root_sid);
- }
- return status;
- }
- /*******************************************************************
- Create a NT token for the user, expanding local aliases
- *******************************************************************/
- struct nt_user_token *create_local_nt_token(TALLOC_CTX *mem_ctx,
- const DOM_SID *user_sid,
- bool is_guest,
- int num_groupsids,
- const DOM_SID *groupsids)
- {
- struct nt_user_token *result = NULL;
- int i;
- NTSTATUS status;
- gid_t gid;
- DOM_SID dom_sid;
- DEBUG(10, ("Create local NT token for %s\n",
- sid_string_dbg(user_sid)));
- if (!(result = TALLOC_ZERO_P(mem_ctx, struct nt_user_token))) {
- DEBUG(0, ("talloc failed\n"));
- return NULL;
- }
- /* Add the user and primary group sid */
- status = add_sid_to_array(result, user_sid,
- &result->user_sids, &result->num_sids);
- if (!NT_STATUS_IS_OK(status)) {
- return NULL;
- }
- /* For guest, num_groupsids may be zero. */
- if (num_groupsids) {
- status = add_sid_to_array(result, &groupsids[0],
- &result->user_sids,
- &result->num_sids);
- if (!NT_STATUS_IS_OK(status)) {
- return NULL;
- }
- }
- /* Add in BUILTIN sids */
- status = add_sid_to_array(result, &global_sid_World,
- &result->user_sids, &result->num_sids);
- if (!NT_STATUS_IS_OK(status)) {
- return NULL;
- }
- status = add_sid_to_array(result, &global_sid_Network,
- &result->user_sids, &result->num_sids);
- if (!NT_STATUS_IS_OK(status)) {
- return NULL;
- }
- if (is_guest) {
- status = add_sid_to_array(result, &global_sid_Builtin_Guests,
- &result->user_sids,
- &result->num_sids);
- if (!NT_STATUS_IS_OK(status)) {
- return NULL;
- }
- } else {
- status = add_sid_to_array(result,
- &global_sid_Authenticated_Users,
- &result->user_sids,
- &result->num_sids);
- if (!NT_STATUS_IS_OK(status)) {
- return NULL;
- }
- }
- /* Now the SIDs we got from authentication. These are the ones from
- * the info3 struct or from the pdb_enum_group_memberships, depending
- * on who authenticated the user.
- * Note that we start the for loop at "1" here, we already added the
- * first group sid as primary above. */
- for (i=1; i<num_groupsids; i++) {
- status = add_sid_to_array_unique(result, &groupsids[i],
- &result->user_sids,
- &result->num_sids);
- if (!NT_STATUS_IS_OK(status)) {
- return NULL;
- }
- }
- /* Deal with the BUILTIN\Administrators group. If the SID can
- be resolved then assume that the add_aliasmem( S-1-5-32 )
- handled it. */
- if (!sid_to_gid(&global_sid_Builtin_Administrators, &gid)) {
- become_root();
- if (!secrets_fetch_domain_sid(lp_workgroup(), &dom_sid)) {
- status = NT_STATUS_OK;
- DEBUG(3, ("Failed to fetch domain sid for %s\n",
- lp_workgroup()));
- } else {
- status = create_builtin_administrators(&dom_sid);
- }
- unbecome_root();
- if (NT_STATUS_EQUAL(status, NT_STATUS_PROTOCOL_UNREACHABLE)) {
- /* Add BUILTIN\Administrators directly to token. */
- status = add_builtin_administrators(result, &dom_sid);
- if ( !NT_STATUS_IS_OK(status) ) {
- DEBUG(3, ("Failed to check for local "
- "Administrators membership (%s)\n",
- nt_errstr(status)));
- }
- } else if (!NT_STATUS_IS_OK(status)) {
- DEBUG(2, ("WARNING: Failed to create "
- "BUILTIN\\Administrators group! Can "
- "Winbind allocate gids?\n"));
- }
- }
- /* Deal with the BUILTIN\Users group. If the SID can
- be resolved then assume that the add_aliasmem( S-1-5-32 )
- handled it. */
- if (!sid_to_gid(&global_sid_Builtin_Users, &gid)) {
- become_root();
- if (!secrets_fetch_domain_sid(lp_workgroup(), &dom_sid)) {
- status = NT_STATUS_OK;
- DEBUG(3, ("Failed to fetch domain sid for %s\n",
- lp_workgroup()));
- } else {
- status = create_builtin_users(&dom_sid);
- }
- unbecome_root();
- if (!NT_STATUS_EQUAL(status, NT_STATUS_PROTOCOL_UNREACHABLE) &&
- !NT_STATUS_IS_OK(status))
- {
- DEBUG(2, ("WARNING: Failed to create BUILTIN\\Users group! "
- "Can Winbind allocate gids?\n"));
- }
- }
- /* Deal with local groups */
- if (lp_winbind_nested_groups()) {
- become_root();
- /* Now add the aliases. First the one from our local SAM */
- status = add_aliases(get_global_sam_sid(), result);
- if (!NT_STATUS_IS_OK(status)) {
- unbecome_root();
- TALLOC_FREE(result);
- return NULL;
- }
- /* Finally the builtin ones */
- status = add_aliases(&global_sid_Builtin, result);
- if (!NT_STATUS_IS_OK(status)) {
- unbecome_root();
- TALLOC_FREE(result);
- return NULL;
- }
- unbecome_root();
- }
- get_privileges_for_sids(&result->privileges, result->user_sids,
- result->num_sids);
- return result;
- }
- /****************************************************************************
- prints a NT_USER_TOKEN to debug output.
- ****************************************************************************/
- void debug_nt_user_token(int dbg_class, int dbg_lev, NT_USER_TOKEN *token)
- {
- size_t i;
- if (!token) {
- DEBUGC(dbg_class, dbg_lev, ("NT user token: (NULL)\n"));
- return;
- }
- DEBUGC(dbg_class, dbg_lev,
- ("NT user token of user %s\n",
- sid_string_dbg(&token->user_sids[0]) ));
- DEBUGADDC(dbg_class, dbg_lev,
- ("contains %lu SIDs\n", (unsigned long)token->num_sids));
- for (i = 0; i < token->num_sids; i++)
- DEBUGADDC(dbg_class, dbg_lev,
- ("SID[%3lu]: %s\n", (unsigned long)i,
- sid_string_dbg(&token->user_sids[i])));
- dump_se_priv( dbg_class, dbg_lev, &token->privileges );
- }
- /****************************************************************************
- prints a UNIX 'token' to debug output.
- ****************************************************************************/
- void debug_unix_user_token(int dbg_class, int dbg_lev, uid_t uid, gid_t gid,
- int n_groups, gid_t *groups)
- {
- int i;
- DEBUGC(dbg_class, dbg_lev,
- ("UNIX token of user %ld\n", (long int)uid));
- DEBUGADDC(dbg_class, dbg_lev,
- ("Primary group is %ld and contains %i supplementary "
- "groups\n", (long int)gid, n_groups));
- for (i = 0; i < n_groups; i++)
- DEBUGADDC(dbg_class, dbg_lev, ("Group[%3i]: %ld\n", i,
- (long int)groups[i]));
- }
- /* END */