/* * 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_getpwnam( "root" )) ) { DEBUG(0,("get_root_nt_token: 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 */