1  /*
       2   * Copyright (c) 2020-2022 The strace developers.
       3   * All rights reserved.
       4   *
       5   * SPDX-License-Identifier: GPL-2.0-or-later
       6   */
       7  
       8  #include "tests.h"
       9  #include "xmalloc.h"
      10  #include <unistd.h>
      11  
      12  char *secontext_full_fd(int) ATTRIBUTE_MALLOC;
      13  char *secontext_full_file(const char *, bool) ATTRIBUTE_MALLOC;
      14  char *secontext_full_pid(pid_t) ATTRIBUTE_MALLOC;
      15  
      16  char *secontext_short_fd(int) ATTRIBUTE_MALLOC;
      17  char *secontext_short_file(const char *, bool) ATTRIBUTE_MALLOC;
      18  char *secontext_short_pid(pid_t) ATTRIBUTE_MALLOC;
      19  
      20  enum secontext_field {
      21  	SECONTEXT_USER,
      22  	SECONTEXT_ROLE,
      23  	SECONTEXT_TYPE
      24  };
      25  
      26  #if defined TEST_SECONTEXT && defined HAVE_SELINUX_RUNTIME
      27  
      28  /**
      29   * Parse a SELinux context string and return a specified field, duplicated
      30   * in a separate string.  The caller is responsible for freeing the memory
      31   * pointed by the returned value.
      32   */
      33  char *get_secontext_field(const char *full_context, enum secontext_field field);
      34  
      35  char *get_secontext_field_fd(int fd, enum secontext_field field);
      36  char *get_secontext_field_file(const char *file, enum secontext_field field);
      37  
      38  void reset_secontext_file(const char *file);
      39  
      40  void update_secontext_field(const char *file, enum secontext_field field,
      41  			    const char *newvalue);
      42  
      43  # ifdef PRINT_SECONTEXT_FULL
      44  
      45  #  ifdef PRINT_SECONTEXT_MISMATCH
      46  #   define SECONTEXT_FILE(filename)	secontext_full_file(filename, true)
      47  #  else
      48  #   define SECONTEXT_FILE(filename)	secontext_full_file(filename, false)
      49  #  endif
      50  #  define SECONTEXT_FD(fd)		secontext_full_fd(fd)
      51  #  define SECONTEXT_PID(pid)		secontext_full_pid(pid)
      52  
      53  # else
      54  
      55  #  ifdef PRINT_SECONTEXT_MISMATCH
      56  #   define SECONTEXT_FILE(filename)	secontext_short_file(filename, true)
      57  #  else
      58  #   define SECONTEXT_FILE(filename)	secontext_short_file(filename, false)
      59  #  endif
      60  #  define SECONTEXT_FD(fd)		secontext_short_fd(fd)
      61  #  define SECONTEXT_PID(pid)		secontext_short_pid(pid)
      62  
      63  # endif
      64  
      65  #else
      66  
      67  static inline char *
      68  get_secontext_field(const char *ctx, enum secontext_field field)
      69  {
      70  	return NULL;
      71  }
      72  static inline char *
      73  get_secontext_field_fd(int fd, enum secontext_field field)
      74  {
      75  	return NULL;
      76  }
      77  
      78  static inline char *
      79  get_secontext_field_file(const char *file, enum secontext_field field)
      80  {
      81  	return NULL;
      82  }
      83  
      84  static inline void
      85  reset_secontext_file(const char *file)
      86  {
      87  }
      88  
      89  static inline void
      90  update_secontext_field(const char *file, enum secontext_field field,
      91  		       const char *newvalue)
      92  {
      93  }
      94  
      95  # define SECONTEXT_FD(fd)			xstrdup("")
      96  # define SECONTEXT_FILE(filename)		xstrdup("")
      97  # define SECONTEXT_PID(pid)			xstrdup("")
      98  
      99  #endif
     100  
     101  #define SECONTEXT_PID_MY()		SECONTEXT_PID(getpid())