Fix bug #8882 - Broken processing of %U with vfs_full_audit when force user is set.
[samba.git] / source3 / smbd / service.c
index 5ade8270d5d64fa7c625b0cdcc281420f151a217..2de9384893568d8cec52c5fcf3da8d82c062debe 100644 (file)
@@ -56,7 +56,12 @@ bool set_conn_connectpath(connection_struct *conn, const char *connectpath)
        const char *s = connectpath;
         bool start_of_name_component = true;
 
-       destname = SMB_STRDUP(connectpath);
+       if (connectpath == NULL || connectpath[0] == '\0') {
+               return false;
+       }
+
+       /* Allocate for strlen + '\0' + possible leading '/' */
+       destname = SMB_MALLOC(strlen(connectpath) + 2);
        if (!destname) {
                return false;
        }
@@ -182,8 +187,8 @@ bool set_current_service(connection_struct *conn, uint16 flags, bool do_chdir)
        if (do_chdir &&
            vfs_ChDir(conn,conn->connectpath) != 0 &&
            vfs_ChDir(conn,conn->origpath) != 0) {
-               DEBUG(0,("chdir (%s) failed\n",
-                        conn->connectpath));
+                DEBUG(((errno!=EACCES)?0:3),("chdir (%s) failed, reason: %s\n",
+                         conn->connectpath, strerror(errno)));
                return(False);
        }
 
@@ -259,7 +264,7 @@ int add_home_service(const char *service, const char *username, const char *home
 {
        int iHomeService;
 
-       if (!service || !homedir)
+       if (!service || !homedir || homedir[0] == '\0')
                return -1;
 
        if ((iHomeService = lp_servicenumber(HOMES_NAME)) < 0) {
@@ -334,7 +339,7 @@ int find_service(fstring service)
                if ((iPrinterService = lp_servicenumber(PRINTERS_NAME)) < 0) {
                        iPrinterService = load_registry_service(PRINTERS_NAME);
                }
-               if (iPrinterService) {
+               if (iPrinterService >= 0) {
                        DEBUG(3,("checking whether %s is a valid printer name...\n", service));
                        if (pcap_printername_ok(service)) {
                                DEBUG(3,("%s is a valid printer name\n", service));
@@ -636,23 +641,20 @@ static NTSTATUS create_connection_server_info(struct smbd_server_connection *sco
   connecting user if appropriate.
 ****************************************************************************/
 
-static connection_struct *make_connection_snum(
-                                       struct smbd_server_connection *sconn,
+connection_struct *make_connection_snum(struct smbd_server_connection *sconn,
                                        int snum, user_struct *vuser,
                                        DATA_BLOB password,
                                        const char *pdev,
                                        NTSTATUS *pstatus)
 {
        connection_struct *conn;
-       SMB_STRUCT_STAT st;
+       struct smb_filename *smb_fname_cpath = NULL;
        fstring dev;
        int ret;
        char addr[INET6_ADDRSTRLEN];
-       bool on_err_call_dis_hook = false;
        NTSTATUS status;
 
        fstrcpy(dev, pdev);
-       SET_STAT_INVALID(st);
 
        if (NT_STATUS_IS_ERR(*pstatus = share_sanity_checks(snum, dev))) {
                return NULL;
@@ -675,7 +677,7 @@ static connection_struct *make_connection_snum(
                DEBUG(1, ("create_connection_server_info failed: %s\n",
                          nt_errstr(status)));
                *pstatus = status;
-               conn_free(sconn, conn);
+               conn_free(conn);
                return NULL;
        }
 
@@ -694,7 +696,6 @@ static connection_struct *make_connection_snum(
        conn->printer = (strncmp(dev,"LPT",3) == 0);
        conn->ipc = ( (strncmp(dev,"IPC",3) == 0) ||
                      ( lp_enable_asu_support() && strequal(dev,"ADMIN$")) );
-       conn->dirptr = NULL;
 
        /* Case options for the share. */
        if (lp_casesensitive(snum) == Auto) {
@@ -714,7 +715,6 @@ static connection_struct *make_connection_snum(
        conn->hide_list = NULL;
        conn->veto_oplock_list = NULL;
        conn->aio_write_behind_list = NULL;
-       string_set(&conn->dirpath,"");
 
        conn->read_only = lp_readonly(SNUM(conn));
        conn->admin_user = False;
@@ -732,7 +732,7 @@ static connection_struct *make_connection_snum(
                fuser = talloc_string_sub(conn, lp_force_user(snum), "%S",
                                          lp_servicename(snum));
                if (fuser == NULL) {
-                       conn_free(sconn, conn);
+                       conn_free(conn);
                        *pstatus = NT_STATUS_NO_MEMORY;
                        return NULL;
                }
@@ -741,11 +741,19 @@ static connection_struct *make_connection_snum(
                        conn, fuser, conn->server_info->guest,
                        &forced_serverinfo);
                if (!NT_STATUS_IS_OK(status)) {
-                       conn_free(sconn, conn);
+                       conn_free(conn);
                        *pstatus = status;
                        return NULL;
                }
 
+               /* We don't want to replace the original sanitized_username
+                  as it is the original user given in the connect attempt.
+                  This is used in '%U' substitutions. */
+               TALLOC_FREE(forced_serverinfo->sanitized_username);
+               forced_serverinfo->sanitized_username =
+                       talloc_move(forced_serverinfo,
+                                       &conn->server_info->sanitized_username);
+
                TALLOC_FREE(conn->server_info);
                conn->server_info = forced_serverinfo;
 
@@ -766,7 +774,7 @@ static connection_struct *make_connection_snum(
                        &conn->server_info->utok.gid);
 
                if (!NT_STATUS_IS_OK(status)) {
-                       conn_free(sconn, conn);
+                       conn_free(conn);
                        *pstatus = status;
                        return NULL;
                }
@@ -792,14 +800,14 @@ static connection_struct *make_connection_snum(
                                        pdb_get_domain(conn->server_info->sam_account),
                                        lp_pathname(snum));
                if (!s) {
-                       conn_free(sconn, conn);
+                       conn_free(conn);
                        *pstatus = NT_STATUS_NO_MEMORY;
                        return NULL;
                }
 
                if (!set_conn_connectpath(conn,s)) {
                        TALLOC_FREE(s);
-                       conn_free(sconn, conn);
+                       conn_free(conn);
                        *pstatus = NT_STATUS_NO_MEMORY;
                        return NULL;
                }
@@ -831,7 +839,7 @@ static connection_struct *make_connection_snum(
                                         "denied due to security "
                                         "descriptor.\n",
                                          lp_servicename(snum)));
-                               conn_free(sconn, conn);
+                               conn_free(conn);
                                *pstatus = NT_STATUS_ACCESS_DENIED;
                                return NULL;
                        } else {
@@ -844,30 +852,11 @@ static connection_struct *make_connection_snum(
        if (!smbd_vfs_init(conn)) {
                DEBUG(0, ("vfs_init failed for service %s\n",
                          lp_servicename(snum)));
-               conn_free(sconn, conn);
+               conn_free(conn);
                *pstatus = NT_STATUS_BAD_NETWORK_NAME;
                return NULL;
        }
 
-       /*
-        * If widelinks are disallowed we need to canonicalise the connect
-        * path here to ensure we don't have any symlinks in the
-        * connectpath. We will be checking all paths on this connection are
-        * below this directory. We must do this after the VFS init as we
-        * depend on the realpath() pointer in the vfs table. JRA.
-        */
-       if (!lp_widelinks(snum)) {
-               if (!canonicalize_connect_path(conn)) {
-                       DEBUG(0, ("canonicalize_connect_path failed "
-                       "for service %s, path %s\n",
-                               lp_servicename(snum),
-                               conn->connectpath));
-                       conn_free(sconn, conn);
-                       *pstatus = NT_STATUS_BAD_NETWORK_NAME;
-                       return NULL;
-               }
-       }
-
        if ((!conn->printer) && (!conn->ipc)) {
                conn->notify_ctx = notify_init(conn, server_id_self(),
                                               smbd_messaging_context(),
@@ -875,7 +864,11 @@ static connection_struct *make_connection_snum(
                                               conn);
        }
 
-/* ROOT Activities: */ 
+/* ROOT Activities: */
+       /* explicitly check widelinks here so that we can correctly warn
+        * in the logs. */
+       widelinks_warning(snum);
+
        /*
         * Enforce the max connections parameter.
         */
@@ -886,7 +879,7 @@ static connection_struct *make_connection_snum(
 
                DEBUG(1, ("Max connections (%d) exceeded for %s\n",
                          lp_max_connections(snum), lp_servicename(snum)));
-               conn_free(sconn, conn);
+               conn_free(conn);
                *pstatus = NT_STATUS_INSUFFICIENT_RESOURCES;
                return NULL;
        }  
@@ -896,11 +889,35 @@ static connection_struct *make_connection_snum(
         */
        if (!claim_connection(conn, lp_servicename(snum), 0)) {
                DEBUG(1, ("Could not store connections entry\n"));
-               conn_free(sconn, conn);
+               conn_free(conn);
                *pstatus = NT_STATUS_INTERNAL_DB_ERROR;
                return NULL;
        }  
 
+       /* Invoke VFS make connection hook - must be the first
+          VFS operation we do. */
+
+       if (SMB_VFS_CONNECT(conn, lp_servicename(snum),
+                           conn->server_info->unix_name) < 0) {
+               DEBUG(0,("make_connection: VFS make connection failed!\n"));
+               yield_connection(conn, lp_servicename(snum));
+               conn_free(conn);
+               *pstatus = NT_STATUS_UNSUCCESSFUL;
+               return NULL;
+       }
+
+       /*
+        * Fix compatibility issue pointed out by Volker.
+        * We pass the conn->connectpath to the preexec
+        * scripts as a parameter, so attempt to canonicalize
+        * it here before calling the preexec scripts.
+        * We ignore errors here, as it is possible that
+        * the conn->connectpath doesn't exist yet and
+        * the preexec scripts will create them.
+        */
+
+       (void)canonicalize_connect_path(conn);
+
        /* Preexecs are done here as they might make the dir we are to ChDir
         * to below */
        /* execute any "root preexec = " line */
@@ -919,8 +936,9 @@ static connection_struct *make_connection_snum(
                if (ret != 0 && lp_rootpreexec_close(snum)) {
                        DEBUG(1,("root preexec gave %d - failing "
                                 "connection\n", ret));
+                       SMB_VFS_DISCONNECT(conn);
                        yield_connection(conn, lp_servicename(snum));
-                       conn_free(sconn, conn);
+                       conn_free(conn);
                        *pstatus = NT_STATUS_ACCESS_DENIED;
                        return NULL;
                }
@@ -930,8 +948,9 @@ static connection_struct *make_connection_snum(
        if (!change_to_user(conn, conn->vuid)) {
                /* No point continuing if they fail the basic checks */
                DEBUG(0,("Can't become connected user!\n"));
+               SMB_VFS_DISCONNECT(conn);
                yield_connection(conn, lp_servicename(snum));
-               conn_free(sconn, conn);
+               conn_free(conn);
                *pstatus = NT_STATUS_LOGON_FAILURE;
                return NULL;
        }
@@ -962,6 +981,24 @@ static connection_struct *make_connection_snum(
                }
        }
 
+       /*
+        * If widelinks are disallowed we need to canonicalise the connect
+        * path here to ensure we don't have any symlinks in the
+        * connectpath. We will be checking all paths on this connection are
+        * below this directory. We must do this after the VFS init as we
+        * depend on the realpath() pointer in the vfs table. JRA.
+        */
+       if (!lp_widelinks(snum)) {
+               if (!canonicalize_connect_path(conn)) {
+                       DEBUG(0, ("canonicalize_connect_path failed "
+                       "for service %s, path %s\n",
+                               lp_servicename(snum),
+                               conn->connectpath));
+                       *pstatus = NT_STATUS_BAD_NETWORK_NAME;
+                       goto err_root_exit;
+               }
+       }
+
 #ifdef WITH_FAKE_KASERVER
        if (lp_afs_share(snum)) {
                afs_login(conn);
@@ -977,28 +1014,21 @@ static connection_struct *make_connection_snum(
                                lp_aio_write_behind(snum));
        }
        
-       /* Invoke VFS make connection hook - do this before the VFS_STAT call
-          to allow any filesystems needing user credentials to initialize
-          themselves. */
-
-       if (SMB_VFS_CONNECT(conn, lp_servicename(snum),
-                           conn->server_info->unix_name) < 0) {
-               DEBUG(0,("make_connection: VFS make connection failed!\n"));
-               *pstatus = NT_STATUS_UNSUCCESSFUL;
+       status = create_synthetic_smb_fname(talloc_tos(), conn->connectpath,
+                                           NULL, NULL, &smb_fname_cpath);
+       if (!NT_STATUS_IS_OK(status)) {
+               *pstatus = status;
                goto err_root_exit;
        }
 
-       /* Any error exit after here needs to call the disconnect hook. */
-       on_err_call_dis_hook = true;
-
        /* win2000 does not check the permissions on the directory
           during the tree connect, instead relying on permission
           check during individual operations. To match this behaviour
           I have disabled this chdir check (tridge) */
        /* the alternative is just to check the directory exists */
-       if ((ret = SMB_VFS_STAT(conn, conn->connectpath, &st)) != 0 ||
-           !S_ISDIR(st.st_ex_mode)) {
-               if (ret == 0 && !S_ISDIR(st.st_ex_mode)) {
+       if ((ret = SMB_VFS_STAT(conn, smb_fname_cpath)) != 0 ||
+           !S_ISDIR(smb_fname_cpath->st.st_ex_mode)) {
+               if (ret == 0 && !S_ISDIR(smb_fname_cpath->st.st_ex_mode)) {
                        DEBUG(0,("'%s' is not a directory, when connecting to "
                                 "[%s]\n", conn->connectpath,
                                 lp_servicename(snum)));
@@ -1011,6 +1041,7 @@ static connection_struct *make_connection_snum(
                *pstatus = NT_STATUS_BAD_NETWORK_NAME;
                goto err_root_exit;
        }
+       conn->base_share_dev = smb_fname_cpath->st.st_ex_dev;
 
        string_set(&conn->origpath,conn->connectpath);
 
@@ -1036,7 +1067,7 @@ static connection_struct *make_connection_snum(
         * the same characteristics, which is likely but not guaranteed.
         */
 
-       conn->fs_capabilities = SMB_VFS_FS_CAPABILITIES(conn);
+       conn->fs_capabilities = SMB_VFS_FS_CAPABILITIES(conn, &conn->ts_res);
 
        /*
         * Print out the 'connected as' stuff here as we need
@@ -1060,14 +1091,12 @@ static connection_struct *make_connection_snum(
        return(conn);
 
   err_root_exit:
-
+       TALLOC_FREE(smb_fname_cpath);
        change_to_root_user();
-       if (on_err_call_dis_hook) {
-               /* Call VFS disconnect hook */
-               SMB_VFS_DISCONNECT(conn);
-       }
+       /* Call VFS disconnect hook */
+       SMB_VFS_DISCONNECT(conn);
        yield_connection(conn, lp_servicename(snum));
-       conn_free(sconn, conn);
+       conn_free(conn);
        return NULL;
 }
 
@@ -1186,7 +1215,7 @@ connection_struct *make_connection(struct smbd_server_connection *sconn,
                        return NULL;
                }
 
-               DEBUG(0,("%s (%s) couldn't find service %s\n",
+               DEBUG(3,("%s (%s) couldn't find service %s\n",
                        get_remote_machine_name(),
                        client_addr(get_client_fd(),addr,sizeof(addr)),
                        service));
@@ -1214,8 +1243,7 @@ connection_struct *make_connection(struct smbd_server_connection *sconn,
  Close a cnum.
 ****************************************************************************/
 
-void close_cnum(struct smbd_server_connection *sconn,
-               connection_struct *conn, uint16 vuid)
+void close_cnum(connection_struct *conn, uint16 vuid)
 {
        file_close_conn(conn);
 
@@ -1269,5 +1297,5 @@ void close_cnum(struct smbd_server_connection *sconn,
                TALLOC_FREE(cmd);
        }
 
-       conn_free(sconn, conn);
+       conn_free(conn);
 }