/* Unix SMB/CIFS implementation. Password and authentication handling Copyright (C) Jeremy Allison 1996-2002 Copyright (C) Andrew Tridgell 2002 Copyright (C) Gerald (Jerry) Carter 2000 Copyright (C) Stefan (metze) Metzmacher 2002 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" /* NOTE! the global_sam_sid is the SID of our local SAM. This is only equal to the domain SID when we are a DC, otherwise its our workstation SID */ static DOM_SID *global_sam_sid=NULL; #undef DBGC_CLASS #define DBGC_CLASS DBGC_PASSDB /**************************************************************************** Read a SID from a file. This is for compatibility with the old MACHINE.SID style of SID storage ****************************************************************************/ static bool read_sid_from_file(const char *fname, DOM_SID *sid) { char **lines; int numlines; bool ret; lines = file_lines_load(fname, &numlines,0, NULL); if (!lines || numlines < 1) { if (lines) TALLOC_FREE(lines); return False; } ret = string_to_sid(sid, lines[0]); TALLOC_FREE(lines); return ret; } /* generate a random sid - used to build our own sid if we don't have one */ static void generate_random_sid(DOM_SID *sid) { int i; uchar raw_sid_data[12]; memset((char *)sid, '\0', sizeof(*sid)); sid->sid_rev_num = 1; sid->id_auth[5] = 5; sid->num_auths = 0; sid->sub_auths[sid->num_auths++] = 21; generate_random_buffer(raw_sid_data, 12); for (i = 0; i < 3; i++) sid->sub_auths[sid->num_auths++] = IVAL(raw_sid_data, i*4); } /**************************************************************************** Generate the global machine sid. ****************************************************************************/ static DOM_SID *pdb_generate_sam_sid(void) { DOM_SID domain_sid; char *fname = NULL; DOM_SID *sam_sid; if(!(sam_sid=SMB_MALLOC_P(DOM_SID))) return NULL; if ( IS_DC ) { if (secrets_fetch_domain_sid(lp_workgroup(), &domain_sid)) { sid_copy(sam_sid, &domain_sid); return sam_sid; } } if (secrets_fetch_domain_sid(global_myname(), sam_sid)) { /* We got our sid. If not a pdc/bdc, we're done. */ if ( !IS_DC ) return sam_sid; if (!secrets_fetch_domain_sid(lp_workgroup(), &domain_sid)) { /* No domain sid and we're a pdc/bdc. Store it */ if (!secrets_store_domain_sid(lp_workgroup(), sam_sid)) { DEBUG(0,("pdb_generate_sam_sid: Can't store domain SID as a pdc/bdc.\n")); SAFE_FREE(sam_sid); return NULL; } return sam_sid; } if (!sid_equal(&domain_sid, sam_sid)) { /* Domain name sid doesn't match global sam sid. Re-store domain sid as 'local' sid. */ DEBUG(0,("pdb_generate_sam_sid: Mismatched SIDs as a pdc/bdc.\n")); if (!secrets_store_domain_sid(global_myname(), &domain_sid)) { DEBUG(0,("pdb_generate_sam_sid: Can't re-store domain SID for local sid as PDC/BDC.\n")); SAFE_FREE(sam_sid); return NULL; } return sam_sid; } return sam_sid; } /* check for an old MACHINE.SID file for backwards compatibility */ if (asprintf(&fname, "%s/MACHINE.SID", lp_private_dir()) == -1) { SAFE_FREE(sam_sid); return NULL; } if (read_sid_from_file(fname, sam_sid)) { /* remember it for future reference and unlink the old MACHINE.SID */ if (!secrets_store_domain_sid(global_myname(), sam_sid)) { DEBUG(0,("pdb_generate_sam_sid: Failed to store SID from file.\n")); SAFE_FREE(fname); SAFE_FREE(sam_sid); return NULL; } unlink(fname); if ( !IS_DC ) { if (!secrets_store_domain_sid(lp_workgroup(), sam_sid)) { DEBUG(0,("pdb_generate_sam_sid: Failed to store domain SID from file.\n")); SAFE_FREE(fname); SAFE_FREE(sam_sid); return NULL; } } /* Stored the old sid from MACHINE.SID successfully.*/ SAFE_FREE(fname); return sam_sid; } SAFE_FREE(fname); /* we don't have the SID in secrets.tdb, we will need to generate one and save it */ generate_random_sid(sam_sid); if (!secrets_store_domain_sid(global_myname(), sam_sid)) { DEBUG(0,("pdb_generate_sam_sid: Failed to store generated machine SID.\n")); SAFE_FREE(sam_sid); return NULL; } if ( IS_DC ) { if (!secrets_store_domain_sid(lp_workgroup(), sam_sid)) { DEBUG(0,("pdb_generate_sam_sid: Failed to store generated domain SID.\n")); SAFE_FREE(sam_sid); return NULL; } } return sam_sid; } /* return our global_sam_sid */ DOM_SID *get_global_sam_sid(void) { struct db_context *db; if (global_sam_sid != NULL) return global_sam_sid; /* * memory for global_sam_sid is allocated in * pdb_generate_sam_sid() as needed * * Note: this is garded by a transaction * to prevent races on startup which * can happen with some dbwrap backends */ db = secrets_db_ctx(); if (!db) { smb_panic("could not open secrets db"); } if (db->transaction_start(db) != 0) { smb_panic("could not start transaction on secrets db"); } if (!(global_sam_sid = pdb_generate_sam_sid())) { db->transaction_cancel(db); smb_panic("could not generate a machine SID"); } if (db->transaction_commit(db) != 0) { smb_panic("could not start commit secrets db"); } return global_sam_sid; } /** * Force get_global_sam_sid to requery the backends */ void reset_global_sam_sid(void) { SAFE_FREE(global_sam_sid); } /***************************************************************** Check if the SID is our domain SID (S-1-5-21-x-y-z). *****************************************************************/ bool sid_check_is_domain(const DOM_SID *sid) { return sid_equal(sid, get_global_sam_sid()); } /***************************************************************** Check if the SID is our domain SID (S-1-5-21-x-y-z). *****************************************************************/ bool sid_check_is_in_our_domain(const DOM_SID *sid) { DOM_SID dom_sid; uint32 rid; sid_copy(&dom_sid, sid); sid_split_rid(&dom_sid, &rid); return sid_check_is_domain(&dom_sid); }