gitee.com/mysnapcore/mysnapd@v0.1.0/interfaces/builtin/qualcomm_ipc_router.go (about)

     1  // -*- Mode: Go; indent-tabs-mode: t -*-
     2  
     3  /*
     4   * Copyright (C) 2021 Canonical Ltd
     5   *
     6   * This program is free software: you can redistribute it and/or modify
     7   * it under the terms of the GNU General Public License version 3 as
     8   * published by the Free Software Foundation.
     9   *
    10   * This program is distributed in the hope that it will be useful,
    11   * but WITHOUT ANY WARRANTY; without even the implied warranty of
    12   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    13   * GNU General Public License for more details.
    14   *
    15   * You should have received a copy of the GNU General Public License
    16   * along with this program.  If not, see <http://www.gnu.org/licenses/>.
    17   *
    18   */
    19  
    20  package builtin
    21  
    22  import (
    23  	"fmt"
    24  
    25  	"gitee.com/mysnapcore/mysnapd/interfaces"
    26  	apparmor_sandbox "gitee.com/mysnapcore/mysnapd/sandbox/apparmor"
    27  	"gitee.com/mysnapcore/mysnapd/strutil"
    28  )
    29  
    30  /*
    31   * The AF_QIPCRTR (42) is defined in linux kernel include/linux/socket.h[1]
    32   * The implementation of this protocol is in net/qrtr[2]
    33   *
    34   * [1] https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/tree/include/linux/socket.h
    35   * [2] https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/tree/net/qrtr
    36   */
    37  const qipcrtrSummary = `allows access to the Qualcomm IPC Router sockets`
    38  
    39  const qipcrtrBaseDeclarationSlots = `
    40    qualcomm-ipc-router:
    41      allow-installation:
    42        slot-snap-type:
    43          - core
    44      deny-auto-connection: true
    45  `
    46  
    47  const qipcrtrConnectedPlugAppArmor = `
    48  # Description: allows access to the Qualcomm IPC Router sockets
    49  #              and limits to sock_dgram only
    50  network qipcrtr,
    51  
    52  # CAP_NET_ADMIN required for port number smaller QRTR_MIN_EPH_SOCKET per 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/tree/net/qrtr/qrtr.c'
    53  capability net_admin,
    54  `
    55  
    56  const qipcrtrConnectedPlugSecComp = `
    57  # Description: allows access to the Qualcomm IPC Router sockets
    58  bind
    59  
    60  # We allow AF_QIPCRTR in the default template since it is mediated via the AppArmor rule
    61  #socket AF_QIPCRTR
    62  `
    63  
    64  type qualcomIPCRouterInterface struct {
    65  	commonInterface
    66  }
    67  
    68  func (iface *qualcomIPCRouterInterface) BeforeConnectPlug(plug *interfaces.ConnectedPlug) error {
    69  	if apparmor_sandbox.ProbedLevel() == apparmor_sandbox.Unsupported {
    70  		// no apparmor means we don't have to deal with parser features
    71  		return nil
    72  	}
    73  	features, err := apparmor_sandbox.ParserFeatures()
    74  	if err != nil {
    75  		return err
    76  	}
    77  
    78  	if !strutil.ListContains(features, "qipcrtr-socket") {
    79  		// then the host system doesn't have the required feature to compile the
    80  		// policy, the qipcrtr socket is a new addition not present in i.e.
    81  		// xenial
    82  		return fmt.Errorf("cannot connect plug on system without qipcrtr socket support")
    83  	}
    84  
    85  	return nil
    86  }
    87  
    88  func init() {
    89  	registerIface(&qualcomIPCRouterInterface{
    90  		commonInterface{
    91  			name:                  "qualcomm-ipc-router",
    92  			summary:               qipcrtrSummary,
    93  			implicitOnCore:        true,
    94  			implicitOnClassic:     true,
    95  			connectedPlugAppArmor: qipcrtrConnectedPlugAppArmor,
    96  			baseDeclarationSlots:  qipcrtrBaseDeclarationSlots,
    97  			connectedPlugSecComp:  qipcrtrConnectedPlugSecComp,
    98  		},
    99  	})
   100  }