examples/VFS/audit.c

   1 /*
   2  * Auditing VFS module for samba.  Log selected file operations to syslog
   3  * facility.
   4  *
   5  * Copyright (C) Tim Potter, 1999-2000
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License as published by
   9  * the Free Software Foundation; either version 2 of the License, or
  10  * (at your option) any later version.
  11  *
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License
  18  * along with this program; if not, write to the Free Software
  19  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  20  */
  21
  22 #include "config.h"
  23 #include <stdio.h>
  24 #include <sys/stat.h>
  25 #ifdef HAVE_UTIME_H
  26 #include <utime.h>
  27 #endif
  28 #ifdef HAVE_DIRENT_H
  29 #include <dirent.h>
  30 #endif
  31 #include <syslog.h>
  32 #ifdef HAVE_FCNTL_H
  33 #include <fcntl.h>
  34 #endif
  35 #include <errno.h>
  36 #include <string.h>
  37 #include <vfs.h>
  38
  39 #ifndef SYSLOG_FACILITY
  40 #define SYSLOG_FACILITY   LOG_USER
  41 #endif
  42
  43 #ifndef SYSLOG_PRIORITY
  44 #define SYSLOG_PRIORITY   LOG_NOTICE
  45 #endif
  46
  47 /* Function prototypes */
  48
  49 int audit_connect(struct vfs_connection_struct *conn, char *svc, char *user);
  50 void audit_disconnect(void);
  51 DIR *audit_opendir(char *fname);
  52 int audit_mkdir(char *path, mode_t mode);
  53 int audit_rmdir(char *path);
  54 int audit_open(char *fname, int flags, mode_t mode);
  55 int audit_close(int fd);
  56 int audit_rename(char *old, char *new);
  57 int audit_unlink(char *path);
  58 int audit_chmod(char *path, mode_t mode);
  59
  60 /* VFS operations */
  61
  62 extern struct vfs_ops default_vfs_ops;   /* For passthrough operation */
  63
  64 struct vfs_ops audit_ops = {
  65
  66         /* Disk operations */
  67
  68         audit_connect,
  69         audit_disconnect,
  70         NULL,                     /* disk free */
  71
  72         /* Directory operations */
  73
  74         audit_opendir,
  75         NULL,                     /* readdir */
  76         audit_mkdir,
  77         audit_rmdir,
  78         NULL,                     /* closedir */
  79
  80         /* File operations */
  81
  82         audit_open,
  83         audit_close,
  84         NULL,                     /* read  */
  85         NULL,                     /* write */
  86         NULL,                     /* lseek */
  87         audit_rename,
  88         NULL,                     /* fsync */
  89         NULL,                     /* stat  */
  90         NULL,                     /* fstat */
  91         NULL,                     /* lstat */
  92         audit_unlink,
  93         NULL,                     /* chmod */
  94         NULL,                     /* utime */
  95         NULL,                     /* ftruncate */
  96         NULL                      /* lock */
  97 };
  98
  99 /* VFS initialisation function.  Return initialised vfs_ops structure
 100    back to SAMBA. */
 101
 102 struct vfs_ops *vfs_init(void)
 103 {
 104         openlog("smbd_audit", LOG_PID, SYSLOG_FACILITY);
 105         return(&audit_ops);
 106 }
 107
 108 /* Implementation of vfs_ops.  Pass everything on to the default
 109    operation but log event first. */
 110
 111 int audit_connect(struct vfs_connection_struct *conn, char *svc, char *user)
 112 {
 113         syslog(SYSLOG_PRIORITY, "connect to service %s by user %s\n",
 114                svc, user);
 115
 116         return default_vfs_ops.connect(conn, svc, user);
 117 }
 118
 119 void audit_disconnect(void)
 120 {
 121         syslog(SYSLOG_PRIORITY, "disconnected\n");
 122         default_vfs_ops.disconnect();
 123 }
 124
 125 DIR *audit_opendir(char *fname)
 126 {
 127         DIR *result = default_vfs_ops.opendir(fname);
 128
 129         syslog(SYSLOG_PRIORITY, "opendir %s %s%s\n",
 130                fname,
 131                (result == NULL) ? "failed: " : "",
 132                (result == NULL) ? strerror(errno) : "");
 133
 134         return result;
 135 }
 136
 137 int audit_mkdir(char *path, mode_t mode)
 138 {
 139         int result = default_vfs_ops.mkdir(path, mode);
 140
 141         syslog(SYSLOG_PRIORITY, "mkdir %s %s%s\n",
 142                path,
 143                (result < 0) ? "failed: " : "",
 144                (result < 0) ? strerror(errno) : "");
 145
 146         return result;
 147 }
 148
 149 int audit_rmdir(char *path)
 150 {
 151         int result = default_vfs_ops.rmdir(path);
 152
 153         syslog(SYSLOG_PRIORITY, "rmdir %s %s%s\n",
 154                path,
 155                (result < 0) ? "failed: " : "",
 156                (result < 0) ? strerror(errno) : "");
 157
 158         return result;
 159 }
 160
 161 int audit_open(char *fname, int flags, mode_t mode)
 162 {
 163         int result = default_vfs_ops.open(fname, flags, mode);
 164
 165         syslog(SYSLOG_PRIORITY, "open %s (fd %d) %s%s%s\n",
 166                fname, result,
 167                ((flags & O_WRONLY) || (flags & O_RDWR)) ? "for writing " : "",
 168                (result < 0) ? "failed: " : "",
 169                (result < 0) ? strerror(errno) : "");
 170
 171         return result;
 172 }
 173
 174 int audit_close(int fd)
 175 {
 176         int result = default_vfs_ops.close(fd);
 177
 178         syslog(SYSLOG_PRIORITY, "close fd %d %s%s\n",
 179                fd,
 180                (result < 0) ? "failed: " : "",
 181                (result < 0) ? strerror(errno) : "");
 182
 183         return result;
 184 }
 185
 186 int audit_rename(char *old, char *new)
 187 {
 188         int result = default_vfs_ops.rename(old, new);
 189
 190         syslog(SYSLOG_PRIORITY, "rename %s -> %s %s%s\n",
 191                old, new,
 192                (result < 0) ? "failed: " : "",
 193                (result < 0) ? strerror(errno) : "");
 194
 195         return result;
 196 }
 197
 198 int audit_unlink(char *path)
 199 {
 200         int result = default_vfs_ops.unlink(path);
 201
 202         syslog(SYSLOG_PRIORITY, "unlink %s %s%s\n",
 203                path,
 204                (result < 0) ? "failed: " : "",
 205                (result < 0) ? strerror(errno) : "");
 206
 207         return result;
 208 }