diff options
Diffstat (limited to 'source3/lib/sharesec.c')
-rw-r--r-- | source3/lib/sharesec.c | 308 |
1 files changed, 308 insertions, 0 deletions
diff --git a/source3/lib/sharesec.c b/source3/lib/sharesec.c new file mode 100644 index 0000000000..b98e304582 --- /dev/null +++ b/source3/lib/sharesec.c @@ -0,0 +1,308 @@ +/* + * Unix SMB/Netbios implementation. + * SEC_DESC handling functions + * Copyright (C) Jeremy R. Allison 1995-2003. + * + * 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 2 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, write to the Free Software + * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. + */ + +#include "includes.h" + +/******************************************************************* + Create the share security tdb. + ********************************************************************/ + +static TDB_CONTEXT *share_tdb; /* used for share security descriptors */ +#define SHARE_DATABASE_VERSION_V1 1 +#define SHARE_DATABASE_VERSION_V2 2 /* version id in little endian. */ + +/* Map generic permissions to file object specific permissions */ + +static struct generic_mapping file_generic_mapping = { + FILE_GENERIC_READ, + FILE_GENERIC_WRITE, + FILE_GENERIC_EXECUTE, + FILE_GENERIC_ALL +}; + + +BOOL share_info_db_init(void) +{ + const char *vstring = "INFO/version"; + int32 vers_id; + + if (share_tdb) { + return True; + } + + share_tdb = tdb_open_log(lock_path("share_info.tdb"), 0, TDB_DEFAULT, O_RDWR|O_CREAT, 0600); + if (!share_tdb) { + DEBUG(0,("Failed to open share info database %s (%s)\n", + lock_path("share_info.tdb"), strerror(errno) )); + return False; + } + + /* handle a Samba upgrade */ + tdb_lock_bystring(share_tdb, vstring, 0); + + /* Cope with byte-reversed older versions of the db. */ + vers_id = tdb_fetch_int32(share_tdb, vstring); + if ((vers_id == SHARE_DATABASE_VERSION_V1) || (IREV(vers_id) == SHARE_DATABASE_VERSION_V1)) { + /* Written on a bigendian machine with old fetch_int code. Save as le. */ + tdb_store_int32(share_tdb, vstring, SHARE_DATABASE_VERSION_V2); + vers_id = SHARE_DATABASE_VERSION_V2; + } + + if (vers_id != SHARE_DATABASE_VERSION_V2) { + tdb_traverse(share_tdb, tdb_traverse_delete_fn, NULL); + tdb_store_int32(share_tdb, vstring, SHARE_DATABASE_VERSION_V2); + } + tdb_unlock_bystring(share_tdb, vstring); + + return True; +} + +/******************************************************************* + Fake up a Everyone, default access as a default. + def_access is a GENERIC_XXX access mode. + ********************************************************************/ + +SEC_DESC *get_share_security_default( TALLOC_CTX *ctx, size_t *psize, uint32 def_access) +{ + SEC_ACCESS sa; + SEC_ACE ace; + SEC_ACL *psa = NULL; + SEC_DESC *psd = NULL; + uint32 spec_access = def_access; + + se_map_generic(&spec_access, &file_generic_mapping); + + init_sec_access(&sa, def_access | spec_access ); + init_sec_ace(&ace, &global_sid_World, SEC_ACE_TYPE_ACCESS_ALLOWED, sa, 0); + + if ((psa = make_sec_acl(ctx, NT4_ACL_REVISION, 1, &ace)) != NULL) { + psd = make_sec_desc(ctx, SEC_DESC_REVISION, SEC_DESC_SELF_RELATIVE, NULL, NULL, NULL, psa, psize); + } + + if (!psd) { + DEBUG(0,("get_share_security: Failed to make SEC_DESC.\n")); + return NULL; + } + + return psd; +} + +/******************************************************************* + Pull a security descriptor from the share tdb. + ********************************************************************/ + +SEC_DESC *get_share_security( TALLOC_CTX *ctx, int snum, size_t *psize) +{ + prs_struct ps; + fstring key; + SEC_DESC *psd = NULL; + + if (!share_info_db_init()) { + return NULL; + } + + *psize = 0; + + /* Fetch security descriptor from tdb */ + + slprintf(key, sizeof(key)-1, "SECDESC/%s", lp_servicename(snum)); + + if (tdb_prs_fetch(share_tdb, key, &ps, ctx)!=0 || + !sec_io_desc("get_share_security", &psd, &ps, 1)) { + + DEBUG(4,("get_share_security: using default secdesc for %s\n", lp_servicename(snum) )); + + return get_share_security_default(ctx, psize, GENERIC_ALL_ACCESS); + } + + if (psd) + *psize = sec_desc_size(psd); + + prs_mem_free(&ps); + return psd; +} + +/******************************************************************* + Store a security descriptor in the share db. + ********************************************************************/ + +BOOL set_share_security(TALLOC_CTX *ctx, const char *share_name, SEC_DESC *psd) +{ + prs_struct ps; + TALLOC_CTX *mem_ctx = NULL; + fstring key; + BOOL ret = False; + + if (!share_info_db_init()) { + return False; + } + + mem_ctx = talloc_init("set_share_security"); + if (mem_ctx == NULL) + return False; + + prs_init(&ps, (uint32)sec_desc_size(psd), mem_ctx, MARSHALL); + + if (!sec_io_desc("share_security", &psd, &ps, 1)) + goto out; + + slprintf(key, sizeof(key)-1, "SECDESC/%s", share_name); + + if (tdb_prs_store(share_tdb, key, &ps)==0) { + ret = True; + DEBUG(5,("set_share_security: stored secdesc for %s\n", share_name )); + } else { + DEBUG(1,("set_share_security: Failed to store secdesc for %s\n", share_name )); + } + + /* Free malloc'ed memory */ + +out: + + prs_mem_free(&ps); + if (mem_ctx) + talloc_destroy(mem_ctx); + return ret; +} + +/******************************************************************* + Delete a security descriptor. +********************************************************************/ + +BOOL delete_share_security(int snum) +{ + TDB_DATA kbuf; + fstring key; + + slprintf(key, sizeof(key)-1, "SECDESC/%s", lp_servicename(snum)); + kbuf.dptr = key; + kbuf.dsize = strlen(key)+1; + + if (tdb_delete(share_tdb, kbuf) != 0) { + DEBUG(0,("delete_share_security: Failed to delete entry for share %s\n", + lp_servicename(snum) )); + return False; + } + + return True; +} + +/*************************************************************************** + Parse the contents of an acl string from a usershare file. +***************************************************************************/ + +BOOL parse_usershare_acl(TALLOC_CTX *ctx, const char *acl_str, SEC_DESC **ppsd) +{ + size_t s_size = 0; + const char *pacl = acl_str; + int num_aces = 0; + SEC_ACE *ace_list = NULL; + SEC_ACL *psa = NULL; + SEC_DESC *psd = NULL; + size_t sd_size = 0; + int i; + + *ppsd = NULL; + + /* If the acl string is blank return "Everyone:R" */ + if (!*acl_str) { + SEC_DESC *default_psd = get_share_security_default(ctx, &s_size, GENERIC_READ_ACCESS); + if (!default_psd) { + return False; + } + *ppsd = default_psd; + return True; + } + + num_aces = 1; + + /* Add the number of ',' characters to get the number of aces. */ + num_aces += count_chars(pacl,','); + + ace_list = TALLOC_ARRAY(ctx, SEC_ACE, num_aces); + if (!ace_list) { + return False; + } + + for (i = 0; i < num_aces; i++) { + SEC_ACCESS sa; + uint32 g_access; + uint32 s_access; + DOM_SID sid; + fstring sidstr; + uint8 type = SEC_ACE_TYPE_ACCESS_ALLOWED; + + if (!next_token(&pacl, sidstr, ":", sizeof(sidstr))) { + DEBUG(0,("parse_usershare_acl: malformed usershare acl looking " + "for ':' in string '%s'\n", pacl)); + return False; + } + + if (!string_to_sid(&sid, sidstr)) { + DEBUG(0,("parse_usershare_acl: failed to convert %s to sid.\n", + sidstr )); + return False; + } + + switch (*pacl) { + case 'F': /* Full Control, ie. R+W */ + case 'f': /* Full Control, ie. R+W */ + s_access = g_access = GENERIC_ALL_ACCESS; + break; + case 'R': /* Read only. */ + case 'r': /* Read only. */ + s_access = g_access = GENERIC_READ_ACCESS; + break; + case 'D': /* Deny all to this SID. */ + case 'd': /* Deny all to this SID. */ + type = SEC_ACE_TYPE_ACCESS_DENIED; + s_access = g_access = GENERIC_ALL_ACCESS; + break; + default: + DEBUG(0,("parse_usershare_acl: unknown acl type at %s.\n", + pacl )); + return False; + } + + pacl++; + if (*pacl && *pacl != ',') { + DEBUG(0,("parse_usershare_acl: bad acl string at %s.\n", + pacl )); + return False; + } + pacl++; /* Go past any ',' */ + + se_map_generic(&s_access, &file_generic_mapping); + init_sec_access(&sa, g_access | s_access ); + init_sec_ace(&ace_list[i], &sid, type, sa, 0); + } + + if ((psa = make_sec_acl(ctx, NT4_ACL_REVISION, num_aces, ace_list)) != NULL) { + psd = make_sec_desc(ctx, SEC_DESC_REVISION, SEC_DESC_SELF_RELATIVE, NULL, NULL, NULL, psa, &sd_size); + } + + if (!psd) { + DEBUG(0,("parse_usershare_acl: Failed to make SEC_DESC.\n")); + return False; + } + + *ppsd = psd; + return True; +} |