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, const char *svc, const char *user);
  33 static void audit_disconnect(vfs_handle_struct *handle);
  34 static SMB_STRUCT_DIR *audit_opendir(vfs_handle_struct *handle, const char *fname, const char *mask, uint32 attr);
  35 static int audit_mkdir(vfs_handle_struct *handle, const char *path, mode_t mode);
  36 static int audit_rmdir(vfs_handle_struct *handle, const char *path);
  37 static int audit_open(vfs_handle_struct *handle, const char *fname, files_struct *fsp, 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, const char *oldname, const char *newname);
  40 static int audit_unlink(vfs_handle_struct *handle, const char *path);
  41 static int audit_chmod(vfs_handle_struct *handle, const char *path, mode_t mode);
  42 static int audit_chmod_acl(vfs_handle_struct *handle, 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         static const struct enum_list enum_log_facilities[] = {
  81                 { LOG_USER, "USER" },
  82                 { LOG_LOCAL0, "LOCAL0" },
  83                 { LOG_LOCAL1, "LOCAL1" },
  84                 { LOG_LOCAL2, "LOCAL2" },
  85                 { LOG_LOCAL3, "LOCAL3" },
  86                 { LOG_LOCAL4, "LOCAL4" },
  87                 { LOG_LOCAL5, "LOCAL5" },
  88                 { LOG_LOCAL6, "LOCAL6" },
  89                 { LOG_LOCAL7, "LOCAL7" }
  90         };
  91
  92         int facility;
  93
  94         facility = lp_parm_enum(SNUM(handle->conn), "audit", "facility", enum_log_facilities, LOG_USER);
  95
  96         return facility;
  97 }
  98
  99
 100 static int audit_syslog_priority(vfs_handle_struct *handle)
 101 {
 102         static const struct enum_list enum_log_priorities[] = {
 103                 { LOG_EMERG, "EMERG" },
 104                 { LOG_ALERT, "ALERT" },
 105                 { LOG_CRIT, "CRIT" },
 106                 { LOG_ERR, "ERR" },
 107                 { LOG_WARNING, "WARNING" },
 108                 { LOG_NOTICE, "NOTICE" },
 109                 { LOG_INFO, "INFO" },
 110                 { LOG_DEBUG, "DEBUG" }
 111         };
 112
 113         int priority;
 114
 115         priority = lp_parm_enum(SNUM(handle->conn), "audit", "priority", enum_log_priorities, LOG_NOTICE);
 116
 117         return priority;
 118 }
 119
 120 /* Implementation of vfs_ops.  Pass everything on to the default
 121    operation but log event first. */
 122
 123 static int audit_connect(vfs_handle_struct *handle, const char *svc, const char *user)
 124 {
 125         int result;
 126
 127         openlog("smbd_audit", LOG_PID, audit_syslog_facility(handle));
 128
 129         syslog(audit_syslog_priority(handle), "connect to service %s by user %s\n",
 130                svc, user);
 131
 132         result = SMB_VFS_NEXT_CONNECT(handle, svc, user);
 133
 134         return result;
 135 }
 136
 137 static void audit_disconnect(vfs_handle_struct *handle)
 138 {
 139         syslog(audit_syslog_priority(handle), "disconnected\n");
 140         SMB_VFS_NEXT_DISCONNECT(handle);
 141
 142         return;
 143 }
 144
 145 static SMB_STRUCT_DIR *audit_opendir(vfs_handle_struct *handle, const char *fname, const char *mask, uint32 attr)
 146 {
 147         SMB_STRUCT_DIR *result;
 148
 149         result = SMB_VFS_NEXT_OPENDIR(handle, fname, mask, attr);
 150
 151         syslog(audit_syslog_priority(handle), "opendir %s %s%s\n",
 152                fname,
 153                (result == NULL) ? "failed: " : "",
 154                (result == NULL) ? strerror(errno) : "");
 155
 156         return result;
 157 }
 158
 159 static int audit_mkdir(vfs_handle_struct *handle, const char *path, mode_t mode)
 160 {
 161         int result;
 162
 163         result = SMB_VFS_NEXT_MKDIR(handle, path, mode);
 164
 165         syslog(audit_syslog_priority(handle), "mkdir %s %s%s\n",
 166                path,
 167                (result < 0) ? "failed: " : "",
 168                (result < 0) ? strerror(errno) : "");
 169
 170         return result;
 171 }
 172
 173 static int audit_rmdir(vfs_handle_struct *handle, const char *path)
 174 {
 175         int result;
 176
 177         result = SMB_VFS_NEXT_RMDIR(handle, path);
 178
 179         syslog(audit_syslog_priority(handle), "rmdir %s %s%s\n",
 180                path,
 181                (result < 0) ? "failed: " : "",
 182                (result < 0) ? strerror(errno) : "");
 183
 184         return result;
 185 }
 186
 187 static int audit_open(vfs_handle_struct *handle, const char *fname, files_struct *fsp, int flags, mode_t mode)
 188 {
 189         int result;
 190
 191         result = SMB_VFS_NEXT_OPEN(handle, fname, fsp, flags, mode);
 192
 193         syslog(audit_syslog_priority(handle), "open %s (fd %d) %s%s%s\n",
 194                fname, result,
 195                ((flags & O_WRONLY) || (flags & O_RDWR)) ? "for writing " : "",
 196                (result < 0) ? "failed: " : "",
 197                (result < 0) ? strerror(errno) : "");
 198
 199         return result;
 200 }
 201
 202 static int audit_close(vfs_handle_struct *handle, files_struct *fsp, int fd)
 203 {
 204         int result;
 205
 206         result = SMB_VFS_NEXT_CLOSE(handle, fsp, fd);
 207
 208         syslog(audit_syslog_priority(handle), "close fd %d %s%s\n",
 209                fd,
 210                (result < 0) ? "failed: " : "",
 211                (result < 0) ? strerror(errno) : "");
 212
 213         return result;
 214 }
 215
 216 static int audit_rename(vfs_handle_struct *handle, const char *oldname, const char *newname)
 217 {
 218         int result;
 219
 220         result = SMB_VFS_NEXT_RENAME(handle, oldname, newname);
 221
 222         syslog(audit_syslog_priority(handle), "rename %s -> %s %s%s\n",
 223                oldname, newname,
 224                (result < 0) ? "failed: " : "",
 225                (result < 0) ? strerror(errno) : "");
 226
 227         return result;
 228 }
 229
 230 static int audit_unlink(vfs_handle_struct *handle, const char *path)
 231 {
 232         int result;
 233
 234         result = SMB_VFS_NEXT_UNLINK(handle, path);
 235
 236         syslog(audit_syslog_priority(handle), "unlink %s %s%s\n",
 237                path,
 238                (result < 0) ? "failed: " : "",
 239                (result < 0) ? strerror(errno) : "");
 240
 241         return result;
 242 }
 243
 244 static int audit_chmod(vfs_handle_struct *handle, const char *path, mode_t mode)
 245 {
 246         int result;
 247
 248         result = SMB_VFS_NEXT_CHMOD(handle, path, mode);
 249
 250         syslog(audit_syslog_priority(handle), "chmod %s mode 0x%x %s%s\n",
 251                path, mode,
 252                (result < 0) ? "failed: " : "",
 253                (result < 0) ? strerror(errno) : "");
 254
 255         return result;
 256 }
 257
 258 static int audit_chmod_acl(vfs_handle_struct *handle, const char *path, mode_t mode)
 259 {
 260         int result;
 261
 262         result = SMB_VFS_NEXT_CHMOD_ACL(handle, path, mode);
 263
 264         syslog(audit_syslog_priority(handle), "chmod_acl %s mode 0x%x %s%s\n",
 265                path, mode,
 266                (result < 0) ? "failed: " : "",
 267                (result < 0) ? strerror(errno) : "");
 268
 269         return result;
 270 }
 271
 272 static int audit_fchmod(vfs_handle_struct *handle, files_struct *fsp, int fd, mode_t mode)
 273 {
 274         int result;
 275
 276         result = SMB_VFS_NEXT_FCHMOD(handle, fsp, fd, mode);
 277
 278         syslog(audit_syslog_priority(handle), "fchmod %s mode 0x%x %s%s\n",
 279                fsp->fsp_name, mode,
 280                (result < 0) ? "failed: " : "",
 281                (result < 0) ? strerror(errno) : "");
 282
 283         return result;
 284 }
 285
 286 static int audit_fchmod_acl(vfs_handle_struct *handle, files_struct *fsp, int fd, mode_t mode)
 287 {
 288         int result;
 289
 290         result = SMB_VFS_NEXT_FCHMOD_ACL(handle, fsp, fd, mode);
 291
 292         syslog(audit_syslog_priority(handle), "fchmod_acl %s mode 0x%x %s%s\n",
 293                fsp->fsp_name, mode,
 294                (result < 0) ? "failed: " : "",
 295                (result < 0) ? strerror(errno) : "");
 296
 297         return result;
 298 }
 299
 300 NTSTATUS vfs_audit_init(void);
 301 NTSTATUS vfs_audit_init(void)
 302 {
 303         return smb_register_vfs(SMB_VFS_INTERFACE_VERSION, "audit", audit_op_tuples);
 304 }