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 3 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, see <http://www.gnu.org/licenses/>.
  21  */
  22
  23
  24 #include "includes.h"
  25
  26 #undef DBGC_CLASS
  27 #define DBGC_CLASS DBGC_VFS
  28
  29 /* Function prototypes */
  30
  31 static int audit_connect(vfs_handle_struct *handle, const char *svc, const char *user);
  32 static void audit_disconnect(vfs_handle_struct *handle);
  33 static SMB_STRUCT_DIR *audit_opendir(vfs_handle_struct *handle, const char *fname, const char *mask, uint32 attr);
  34 static int audit_mkdir(vfs_handle_struct *handle, const char *path, mode_t mode);
  35 static int audit_rmdir(vfs_handle_struct *handle, const char *path);
  36 static int audit_open(vfs_handle_struct *handle, const char *fname, files_struct *fsp, int flags, mode_t mode);
  37 static int audit_close(vfs_handle_struct *handle, files_struct *fsp);
  38 static int audit_rename(vfs_handle_struct *handle, const char *oldname, const char *newname);
  39 static int audit_unlink(vfs_handle_struct *handle, const char *path);
  40 static int audit_chmod(vfs_handle_struct *handle, const char *path, mode_t mode);
  41 static int audit_chmod_acl(vfs_handle_struct *handle, const char *name, mode_t mode);
  42 static int audit_fchmod(vfs_handle_struct *handle, files_struct *fsp, mode_t mode);
  43 static int audit_fchmod_acl(vfs_handle_struct *handle, files_struct *fsp, mode_t mode);
  44
  45 /* VFS operations */
  46
  47 static vfs_op_tuple audit_op_tuples[] = {
  48
  49         /* Disk operations */
  50
  51         {SMB_VFS_OP(audit_connect),     SMB_VFS_OP_CONNECT,     SMB_VFS_LAYER_LOGGER},
  52         {SMB_VFS_OP(audit_disconnect),  SMB_VFS_OP_DISCONNECT,  SMB_VFS_LAYER_LOGGER},
  53
  54         /* Directory operations */
  55
  56         {SMB_VFS_OP(audit_opendir),     SMB_VFS_OP_OPENDIR,     SMB_VFS_LAYER_LOGGER},
  57         {SMB_VFS_OP(audit_mkdir),               SMB_VFS_OP_MKDIR,       SMB_VFS_LAYER_LOGGER},
  58         {SMB_VFS_OP(audit_rmdir),               SMB_VFS_OP_RMDIR,       SMB_VFS_LAYER_LOGGER},
  59
  60         /* File operations */
  61
  62         {SMB_VFS_OP(audit_open),                SMB_VFS_OP_OPEN,        SMB_VFS_LAYER_LOGGER},
  63         {SMB_VFS_OP(audit_close),               SMB_VFS_OP_CLOSE,       SMB_VFS_LAYER_LOGGER},
  64         {SMB_VFS_OP(audit_rename),              SMB_VFS_OP_RENAME,      SMB_VFS_LAYER_LOGGER},
  65         {SMB_VFS_OP(audit_unlink),              SMB_VFS_OP_UNLINK,      SMB_VFS_LAYER_LOGGER},
  66         {SMB_VFS_OP(audit_chmod),               SMB_VFS_OP_CHMOD,       SMB_VFS_LAYER_LOGGER},
  67         {SMB_VFS_OP(audit_fchmod),              SMB_VFS_OP_FCHMOD,      SMB_VFS_LAYER_LOGGER},
  68         {SMB_VFS_OP(audit_chmod_acl),   SMB_VFS_OP_CHMOD_ACL,   SMB_VFS_LAYER_LOGGER},
  69         {SMB_VFS_OP(audit_fchmod_acl),  SMB_VFS_OP_FCHMOD_ACL,  SMB_VFS_LAYER_LOGGER},
  70
  71         /* Finish VFS operations definition */
  72
  73         {SMB_VFS_OP(NULL),                      SMB_VFS_OP_NOOP,        SMB_VFS_LAYER_NOOP}
  74 };
  75
  76
  77 static int audit_syslog_facility(vfs_handle_struct *handle)
  78 {
  79         static const struct enum_list enum_log_facilities[] = {
  80                 { LOG_USER, "USER" },
  81                 { LOG_LOCAL0, "LOCAL0" },
  82                 { LOG_LOCAL1, "LOCAL1" },
  83                 { LOG_LOCAL2, "LOCAL2" },
  84                 { LOG_LOCAL3, "LOCAL3" },
  85                 { LOG_LOCAL4, "LOCAL4" },
  86                 { LOG_LOCAL5, "LOCAL5" },
  87                 { LOG_LOCAL6, "LOCAL6" },
  88                 { LOG_LOCAL7, "LOCAL7" }
  89         };
  90
  91         int facility;
  92
  93         facility = lp_parm_enum(SNUM(handle->conn), "audit", "facility", enum_log_facilities, LOG_USER);
  94
  95         return facility;
  96 }
  97
  98
  99 static int audit_syslog_priority(vfs_handle_struct *handle)
 100 {
 101         static const struct enum_list enum_log_priorities[] = {
 102                 { LOG_EMERG, "EMERG" },
 103                 { LOG_ALERT, "ALERT" },
 104                 { LOG_CRIT, "CRIT" },
 105                 { LOG_ERR, "ERR" },
 106                 { LOG_WARNING, "WARNING" },
 107                 { LOG_NOTICE, "NOTICE" },
 108                 { LOG_INFO, "INFO" },
 109                 { LOG_DEBUG, "DEBUG" }
 110         };
 111
 112         int priority;
 113
 114         priority = lp_parm_enum(SNUM(handle->conn), "audit", "priority",
 115                                 enum_log_priorities, LOG_NOTICE);
 116         if (priority == -1) {
 117                 priority = LOG_WARNING;
 118         }
 119
 120         return priority;
 121 }
 122
 123 /* Implementation of vfs_ops.  Pass everything on to the default
 124    operation but log event first. */
 125
 126 static int audit_connect(vfs_handle_struct *handle, const char *svc, const char *user)
 127 {
 128         int result;
 129
 130         openlog("smbd_audit", LOG_PID, audit_syslog_facility(handle));
 131
 132         syslog(audit_syslog_priority(handle), "connect to service %s by user %s\n",
 133                svc, user);
 134
 135         result = SMB_VFS_NEXT_CONNECT(handle, svc, user);
 136
 137         return result;
 138 }
 139
 140 static void audit_disconnect(vfs_handle_struct *handle)
 141 {
 142         syslog(audit_syslog_priority(handle), "disconnected\n");
 143         SMB_VFS_NEXT_DISCONNECT(handle);
 144
 145         return;
 146 }
 147
 148 static SMB_STRUCT_DIR *audit_opendir(vfs_handle_struct *handle, const char *fname, const char *mask, uint32 attr)
 149 {
 150         SMB_STRUCT_DIR *result;
 151
 152         result = SMB_VFS_NEXT_OPENDIR(handle, fname, mask, attr);
 153
 154         syslog(audit_syslog_priority(handle), "opendir %s %s%s\n",
 155                fname,
 156                (result == NULL) ? "failed: " : "",
 157                (result == NULL) ? strerror(errno) : "");
 158
 159         return result;
 160 }
 161
 162 static int audit_mkdir(vfs_handle_struct *handle, const char *path, mode_t mode)
 163 {
 164         int result;
 165
 166         result = SMB_VFS_NEXT_MKDIR(handle, path, mode);
 167
 168         syslog(audit_syslog_priority(handle), "mkdir %s %s%s\n",
 169                path,
 170                (result < 0) ? "failed: " : "",
 171                (result < 0) ? strerror(errno) : "");
 172
 173         return result;
 174 }
 175
 176 static int audit_rmdir(vfs_handle_struct *handle, const char *path)
 177 {
 178         int result;
 179
 180         result = SMB_VFS_NEXT_RMDIR(handle, path);
 181
 182         syslog(audit_syslog_priority(handle), "rmdir %s %s%s\n",
 183                path,
 184                (result < 0) ? "failed: " : "",
 185                (result < 0) ? strerror(errno) : "");
 186
 187         return result;
 188 }
 189
 190 static int audit_open(vfs_handle_struct *handle, const char *fname, files_struct *fsp, int flags, mode_t mode)
 191 {
 192         int result;
 193
 194         result = SMB_VFS_NEXT_OPEN(handle, fname, fsp, flags, mode);
 195
 196         syslog(audit_syslog_priority(handle), "open %s (fd %d) %s%s%s\n",
 197                fname, result,
 198                ((flags & O_WRONLY) || (flags & O_RDWR)) ? "for writing " : "",
 199                (result < 0) ? "failed: " : "",
 200                (result < 0) ? strerror(errno) : "");
 201
 202         return result;
 203 }
 204
 205 static int audit_close(vfs_handle_struct *handle, files_struct *fsp)
 206 {
 207         int result;
 208
 209         result = SMB_VFS_NEXT_CLOSE(handle, fsp);
 210
 211         syslog(audit_syslog_priority(handle), "close fd %d %s%s\n",
 212                fsp->fh->fd,
 213                (result < 0) ? "failed: " : "",
 214                (result < 0) ? strerror(errno) : "");
 215
 216         return result;
 217 }
 218
 219 static int audit_rename(vfs_handle_struct *handle, const char *oldname, const char *newname)
 220 {
 221         int result;
 222
 223         result = SMB_VFS_NEXT_RENAME(handle, oldname, newname);
 224
 225         syslog(audit_syslog_priority(handle), "rename %s -> %s %s%s\n",
 226                oldname, newname,
 227                (result < 0) ? "failed: " : "",
 228                (result < 0) ? strerror(errno) : "");
 229
 230         return result;
 231 }
 232
 233 static int audit_unlink(vfs_handle_struct *handle, const char *path)
 234 {
 235         int result;
 236
 237         result = SMB_VFS_NEXT_UNLINK(handle, path);
 238
 239         syslog(audit_syslog_priority(handle), "unlink %s %s%s\n",
 240                path,
 241                (result < 0) ? "failed: " : "",
 242                (result < 0) ? strerror(errno) : "");
 243
 244         return result;
 245 }
 246
 247 static int audit_chmod(vfs_handle_struct *handle, const char *path, mode_t mode)
 248 {
 249         int result;
 250
 251         result = SMB_VFS_NEXT_CHMOD(handle, path, mode);
 252
 253         syslog(audit_syslog_priority(handle), "chmod %s mode 0x%x %s%s\n",
 254                path, mode,
 255                (result < 0) ? "failed: " : "",
 256                (result < 0) ? strerror(errno) : "");
 257
 258         return result;
 259 }
 260
 261 static int audit_chmod_acl(vfs_handle_struct *handle, const char *path, mode_t mode)
 262 {
 263         int result;
 264
 265         result = SMB_VFS_NEXT_CHMOD_ACL(handle, path, mode);
 266
 267         syslog(audit_syslog_priority(handle), "chmod_acl %s mode 0x%x %s%s\n",
 268                path, mode,
 269                (result < 0) ? "failed: " : "",
 270                (result < 0) ? strerror(errno) : "");
 271
 272         return result;
 273 }
 274
 275 static int audit_fchmod(vfs_handle_struct *handle, files_struct *fsp, mode_t mode)
 276 {
 277         int result;
 278
 279         result = SMB_VFS_NEXT_FCHMOD(handle, fsp, mode);
 280
 281         syslog(audit_syslog_priority(handle), "fchmod %s mode 0x%x %s%s\n",
 282                fsp->fsp_name, mode,
 283                (result < 0) ? "failed: " : "",
 284                (result < 0) ? strerror(errno) : "");
 285
 286         return result;
 287 }
 288
 289 static int audit_fchmod_acl(vfs_handle_struct *handle, files_struct *fsp, mode_t mode)
 290 {
 291         int result;
 292
 293         result = SMB_VFS_NEXT_FCHMOD_ACL(handle, fsp, mode);
 294
 295         syslog(audit_syslog_priority(handle), "fchmod_acl %s mode 0x%x %s%s\n",
 296                fsp->fsp_name, mode,
 297                (result < 0) ? "failed: " : "",
 298                (result < 0) ? strerror(errno) : "");
 299
 300         return result;
 301 }
 302
 303 NTSTATUS vfs_audit_init(void);
 304 NTSTATUS vfs_audit_init(void)
 305 {
 306         return smb_register_vfs(SMB_VFS_INTERFACE_VERSION, "audit", audit_op_tuples);
 307 }