source/modules/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  * Copyright (C) Alexander Bokovoy              2002
   7  * Copyright (C) Stefan (metze) Metzmacher      2002
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License as published by
  11  * the Free Software Foundation; either version 2 of the License, or
  12  * (at your option) any later version.
  13  *
  14  * This program is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17  * GNU General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU General Public License
  20  * along with this program; if not, write to the Free Software
  21  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  22  */
  23
  24
  25 #include "includes.h"
  26
  27 #undef DBGC_CLASS
  28 #define DBGC_CLASS DBGC_VFS
  29
  30 /* Function prototypes */
  31
  32 static int audit_connect(vfs_handle_struct *handle, connection_struct *conn, const char *svc, const char *user);
  33 static void audit_disconnect(vfs_handle_struct *handle, connection_struct *conn);
  34 static DIR *audit_opendir(vfs_handle_struct *handle, connection_struct *conn, const char *fname);
  35 static int audit_mkdir(vfs_handle_struct *handle, connection_struct *conn, const char *path, mode_t mode);
  36 static int audit_rmdir(vfs_handle_struct *handle, connection_struct *conn, const char *path);
  37 static int audit_open(vfs_handle_struct *handle, connection_struct *conn, const char *fname, int flags, mode_t mode);
  38 static int audit_close(vfs_handle_struct *handle, files_struct *fsp, int fd);
  39 static int audit_rename(vfs_handle_struct *handle, connection_struct *conn, const char *old, const char *new);
  40 static int audit_unlink(vfs_handle_struct *handle, connection_struct *conn, const char *path);
  41 static int audit_chmod(vfs_handle_struct *handle, connection_struct *conn, const char *path, mode_t mode);
  42 static int audit_chmod_acl(vfs_handle_struct *handle, connection_struct *conn, const char *name, mode_t mode);
  43 static int audit_fchmod(vfs_handle_struct *handle, files_struct *fsp, int fd, mode_t mode);
  44 static int audit_fchmod_acl(vfs_handle_struct *handle, files_struct *fsp, int fd, mode_t mode);
  45
  46 /* VFS operations */
  47
  48 static vfs_op_tuple audit_op_tuples[] = {
  49
  50         /* Disk operations */
  51
  52         {SMB_VFS_OP(audit_connect),     SMB_VFS_OP_CONNECT,     SMB_VFS_LAYER_LOGGER},
  53         {SMB_VFS_OP(audit_disconnect),  SMB_VFS_OP_DISCONNECT,  SMB_VFS_LAYER_LOGGER},
  54
  55         /* Directory operations */
  56
  57         {SMB_VFS_OP(audit_opendir),     SMB_VFS_OP_OPENDIR,     SMB_VFS_LAYER_LOGGER},
  58         {SMB_VFS_OP(audit_mkdir),               SMB_VFS_OP_MKDIR,       SMB_VFS_LAYER_LOGGER},
  59         {SMB_VFS_OP(audit_rmdir),               SMB_VFS_OP_RMDIR,       SMB_VFS_LAYER_LOGGER},
  60
  61         /* File operations */
  62
  63         {SMB_VFS_OP(audit_open),                SMB_VFS_OP_OPEN,        SMB_VFS_LAYER_LOGGER},
  64         {SMB_VFS_OP(audit_close),               SMB_VFS_OP_CLOSE,       SMB_VFS_LAYER_LOGGER},
  65         {SMB_VFS_OP(audit_rename),              SMB_VFS_OP_RENAME,      SMB_VFS_LAYER_LOGGER},
  66         {SMB_VFS_OP(audit_unlink),              SMB_VFS_OP_UNLINK,      SMB_VFS_LAYER_LOGGER},
  67         {SMB_VFS_OP(audit_chmod),               SMB_VFS_OP_CHMOD,       SMB_VFS_LAYER_LOGGER},
  68         {SMB_VFS_OP(audit_fchmod),              SMB_VFS_OP_FCHMOD,      SMB_VFS_LAYER_LOGGER},
  69         {SMB_VFS_OP(audit_chmod_acl),   SMB_VFS_OP_CHMOD_ACL,   SMB_VFS_LAYER_LOGGER},
  70         {SMB_VFS_OP(audit_fchmod_acl),  SMB_VFS_OP_FCHMOD_ACL,  SMB_VFS_LAYER_LOGGER},
  71
  72         /* Finish VFS operations definition */
  73
  74         {SMB_VFS_OP(NULL),                      SMB_VFS_OP_NOOP,        SMB_VFS_LAYER_NOOP}
  75 };
  76
  77
  78 static int audit_syslog_facility(vfs_handle_struct *handle)
  79 {
  80         /* fix me: let this be configurable by:
  81          *      lp_param_enum(SNUM(handle->conn),(handle->param?handle->param:"audit"),"syslog facility",
  82          *              audit_enum_facility,LOG_USER);
  83          */
  84         return LOG_USER;
  85 }
  86
  87
  88 static int audit_syslog_priority(vfs_handle_struct *handle)
  89 {
  90         /* fix me: let this be configurable by:
  91          *      lp_param_enum(SNUM(handle->conn),(handle->param?handle->param:"audit"),"syslog priority",
  92          *              audit_enum_priority,LOG_NOTICE);
  93          */
  94         return LOG_NOTICE;
  95 }
  96
  97 /* Implementation of vfs_ops.  Pass everything on to the default
  98    operation but log event first. */
  99
 100 static int audit_connect(vfs_handle_struct *handle, connection_struct *conn, const char *svc, const char *user)
 101 {
 102         int result;
 103
 104         openlog("smbd_audit", LOG_PID, audit_syslog_facility(handle));
 105
 106         syslog(audit_syslog_priority(handle), "connect to service %s by user %s\n",
 107                svc, user);
 108
 109         result = SMB_VFS_NEXT_CONNECT(handle, conn, svc, user);
 110
 111         return result;
 112 }
 113
 114 static void audit_disconnect(vfs_handle_struct *handle, connection_struct *conn)
 115 {
 116         syslog(audit_syslog_priority(handle), "disconnected\n");
 117         SMB_VFS_NEXT_DISCONNECT(handle, conn);
 118
 119         return;
 120 }
 121
 122 static DIR *audit_opendir(vfs_handle_struct *handle, connection_struct *conn, const char *fname)
 123 {
 124         DIR *result;
 125
 126         result = SMB_VFS_NEXT_OPENDIR(handle, conn, fname);
 127
 128         syslog(audit_syslog_priority(handle), "opendir %s %s%s\n",
 129                fname,
 130                (result == NULL) ? "failed: " : "",
 131                (result == NULL) ? strerror(errno) : "");
 132
 133         return result;
 134 }
 135
 136 static int audit_mkdir(vfs_handle_struct *handle, connection_struct *conn, const char *path, mode_t mode)
 137 {
 138         int result;
 139
 140         result = SMB_VFS_NEXT_MKDIR(handle, conn, path, mode);
 141
 142         syslog(audit_syslog_priority(handle), "mkdir %s %s%s\n",
 143                path,
 144                (result < 0) ? "failed: " : "",
 145                (result < 0) ? strerror(errno) : "");
 146
 147         return result;
 148 }
 149
 150 static int audit_rmdir(vfs_handle_struct *handle, connection_struct *conn, const char *path)
 151 {
 152         int result;
 153
 154         result = SMB_VFS_NEXT_RMDIR(handle, conn, path);
 155
 156         syslog(audit_syslog_priority(handle), "rmdir %s %s%s\n",
 157                path,
 158                (result < 0) ? "failed: " : "",
 159                (result < 0) ? strerror(errno) : "");
 160
 161         return result;
 162 }
 163
 164 static int audit_open(vfs_handle_struct *handle, connection_struct *conn, const char *fname, int flags, mode_t mode)
 165 {
 166         int result;
 167
 168         result = SMB_VFS_NEXT_OPEN(handle, conn, fname, flags, mode);
 169
 170         syslog(audit_syslog_priority(handle), "open %s (fd %d) %s%s%s\n",
 171                fname, result,
 172                ((flags & O_WRONLY) || (flags & O_RDWR)) ? "for writing " : "",
 173                (result < 0) ? "failed: " : "",
 174                (result < 0) ? strerror(errno) : "");
 175
 176         return result;
 177 }
 178
 179 static int audit_close(vfs_handle_struct *handle, files_struct *fsp, int fd)
 180 {
 181         int result;
 182
 183         result = SMB_VFS_NEXT_CLOSE(handle, fsp, fd);
 184
 185         syslog(audit_syslog_priority(handle), "close fd %d %s%s\n",
 186                fd,
 187                (result < 0) ? "failed: " : "",
 188                (result < 0) ? strerror(errno) : "");
 189
 190         return result;
 191 }
 192
 193 static int audit_rename(vfs_handle_struct *handle, connection_struct *conn, const char *old, const char *new)
 194 {
 195         int result;
 196
 197         result = SMB_VFS_NEXT_RENAME(handle, conn, old, new);
 198
 199         syslog(audit_syslog_priority(handle), "rename %s -> %s %s%s\n",
 200                old, new,
 201                (result < 0) ? "failed: " : "",
 202                (result < 0) ? strerror(errno) : "");
 203
 204         return result;
 205 }
 206
 207 static int audit_unlink(vfs_handle_struct *handle, connection_struct *conn, const char *path)
 208 {
 209         int result;
 210
 211         result = SMB_VFS_NEXT_UNLINK(handle, conn, path);
 212
 213         syslog(audit_syslog_priority(handle), "unlink %s %s%s\n",
 214                path,
 215                (result < 0) ? "failed: " : "",
 216                (result < 0) ? strerror(errno) : "");
 217
 218         return result;
 219 }
 220
 221 static int audit_chmod(vfs_handle_struct *handle, connection_struct *conn, const char *path, mode_t mode)
 222 {
 223         int result;
 224
 225         result = SMB_VFS_NEXT_CHMOD(handle, conn, path, mode);
 226
 227         syslog(audit_syslog_priority(handle), "chmod %s mode 0x%x %s%s\n",
 228                path, mode,
 229                (result < 0) ? "failed: " : "",
 230                (result < 0) ? strerror(errno) : "");
 231
 232         return result;
 233 }
 234
 235 static int audit_chmod_acl(vfs_handle_struct *handle, connection_struct *conn, const char *path, mode_t mode)
 236 {
 237         int result;
 238
 239         result = SMB_VFS_NEXT_CHMOD_ACL(handle, conn, path, mode);
 240
 241         syslog(audit_syslog_priority(handle), "chmod_acl %s mode 0x%x %s%s\n",
 242                path, mode,
 243                (result < 0) ? "failed: " : "",
 244                (result < 0) ? strerror(errno) : "");
 245
 246         return result;
 247 }
 248
 249 static int audit_fchmod(vfs_handle_struct *handle, files_struct *fsp, int fd, mode_t mode)
 250 {
 251         int result;
 252
 253         result = SMB_VFS_NEXT_FCHMOD(handle, fsp, fd, mode);
 254
 255         syslog(audit_syslog_priority(handle), "fchmod %s mode 0x%x %s%s\n",
 256                fsp->fsp_name, mode,
 257                (result < 0) ? "failed: " : "",
 258                (result < 0) ? strerror(errno) : "");
 259
 260         return result;
 261 }
 262
 263 static int audit_fchmod_acl(vfs_handle_struct *handle, files_struct *fsp, int fd, mode_t mode)
 264 {
 265         int result;
 266
 267         result = SMB_VFS_NEXT_FCHMOD_ACL(handle, fsp, fd, mode);
 268
 269         syslog(audit_syslog_priority(handle), "fchmod_acl %s mode 0x%x %s%s\n",
 270                fsp->fsp_name, mode,
 271                (result < 0) ? "failed: " : "",
 272                (result < 0) ? strerror(errno) : "");
 273
 274         return result;
 275 }
 276
 277 NTSTATUS vfs_audit_init(void)
 278 {
 279         return smb_register_vfs(SMB_VFS_INTERFACE_VERSION, "audit", audit_op_tuples);
 280 }