source3/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, int fd);
  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, int fd, mode_t mode);
  43 static int audit_fchmod_acl(vfs_handle_struct *handle, files_struct *fsp, int fd, 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", enum_log_priorities, LOG_NOTICE);
 115
 116         return priority;
 117 }
 118
 119 /* Implementation of vfs_ops.  Pass everything on to the default
 120    operation but log event first. */
 121
 122 static int audit_connect(vfs_handle_struct *handle, const char *svc, const char *user)
 123 {
 124         int result;
 125
 126         openlog("smbd_audit", LOG_PID, audit_syslog_facility(handle));
 127
 128         syslog(audit_syslog_priority(handle), "connect to service %s by user %s\n",
 129                svc, user);
 130
 131         result = SMB_VFS_NEXT_CONNECT(handle, svc, user);
 132
 133         return result;
 134 }
 135
 136 static void audit_disconnect(vfs_handle_struct *handle)
 137 {
 138         syslog(audit_syslog_priority(handle), "disconnected\n");
 139         SMB_VFS_NEXT_DISCONNECT(handle);
 140
 141         return;
 142 }
 143
 144 static SMB_STRUCT_DIR *audit_opendir(vfs_handle_struct *handle, const char *fname, const char *mask, uint32 attr)
 145 {
 146         SMB_STRUCT_DIR *result;
 147
 148         result = SMB_VFS_NEXT_OPENDIR(handle, fname, mask, attr);
 149
 150         syslog(audit_syslog_priority(handle), "opendir %s %s%s\n",
 151                fname,
 152                (result == NULL) ? "failed: " : "",
 153                (result == NULL) ? strerror(errno) : "");
 154
 155         return result;
 156 }
 157
 158 static int audit_mkdir(vfs_handle_struct *handle, const char *path, mode_t mode)
 159 {
 160         int result;
 161
 162         result = SMB_VFS_NEXT_MKDIR(handle, path, mode);
 163
 164         syslog(audit_syslog_priority(handle), "mkdir %s %s%s\n",
 165                path,
 166                (result < 0) ? "failed: " : "",
 167                (result < 0) ? strerror(errno) : "");
 168
 169         return result;
 170 }
 171
 172 static int audit_rmdir(vfs_handle_struct *handle, const char *path)
 173 {
 174         int result;
 175
 176         result = SMB_VFS_NEXT_RMDIR(handle, path);
 177
 178         syslog(audit_syslog_priority(handle), "rmdir %s %s%s\n",
 179                path,
 180                (result < 0) ? "failed: " : "",
 181                (result < 0) ? strerror(errno) : "");
 182
 183         return result;
 184 }
 185
 186 static int audit_open(vfs_handle_struct *handle, const char *fname, files_struct *fsp, int flags, mode_t mode)
 187 {
 188         int result;
 189
 190         result = SMB_VFS_NEXT_OPEN(handle, fname, fsp, flags, mode);
 191
 192         syslog(audit_syslog_priority(handle), "open %s (fd %d) %s%s%s\n",
 193                fname, result,
 194                ((flags & O_WRONLY) || (flags & O_RDWR)) ? "for writing " : "",
 195                (result < 0) ? "failed: " : "",
 196                (result < 0) ? strerror(errno) : "");
 197
 198         return result;
 199 }
 200
 201 static int audit_close(vfs_handle_struct *handle, files_struct *fsp, int fd)
 202 {
 203         int result;
 204
 205         result = SMB_VFS_NEXT_CLOSE(handle, fsp, fd);
 206
 207         syslog(audit_syslog_priority(handle), "close fd %d %s%s\n",
 208                fd,
 209                (result < 0) ? "failed: " : "",
 210                (result < 0) ? strerror(errno) : "");
 211
 212         return result;
 213 }
 214
 215 static int audit_rename(vfs_handle_struct *handle, const char *oldname, const char *newname)
 216 {
 217         int result;
 218
 219         result = SMB_VFS_NEXT_RENAME(handle, oldname, newname);
 220
 221         syslog(audit_syslog_priority(handle), "rename %s -> %s %s%s\n",
 222                oldname, newname,
 223                (result < 0) ? "failed: " : "",
 224                (result < 0) ? strerror(errno) : "");
 225
 226         return result;
 227 }
 228
 229 static int audit_unlink(vfs_handle_struct *handle, const char *path)
 230 {
 231         int result;
 232
 233         result = SMB_VFS_NEXT_UNLINK(handle, path);
 234
 235         syslog(audit_syslog_priority(handle), "unlink %s %s%s\n",
 236                path,
 237                (result < 0) ? "failed: " : "",
 238                (result < 0) ? strerror(errno) : "");
 239
 240         return result;
 241 }
 242
 243 static int audit_chmod(vfs_handle_struct *handle, const char *path, mode_t mode)
 244 {
 245         int result;
 246
 247         result = SMB_VFS_NEXT_CHMOD(handle, path, mode);
 248
 249         syslog(audit_syslog_priority(handle), "chmod %s mode 0x%x %s%s\n",
 250                path, mode,
 251                (result < 0) ? "failed: " : "",
 252                (result < 0) ? strerror(errno) : "");
 253
 254         return result;
 255 }
 256
 257 static int audit_chmod_acl(vfs_handle_struct *handle, const char *path, mode_t mode)
 258 {
 259         int result;
 260
 261         result = SMB_VFS_NEXT_CHMOD_ACL(handle, path, mode);
 262
 263         syslog(audit_syslog_priority(handle), "chmod_acl %s mode 0x%x %s%s\n",
 264                path, mode,
 265                (result < 0) ? "failed: " : "",
 266                (result < 0) ? strerror(errno) : "");
 267
 268         return result;
 269 }
 270
 271 static int audit_fchmod(vfs_handle_struct *handle, files_struct *fsp, int fd, mode_t mode)
 272 {
 273         int result;
 274
 275         result = SMB_VFS_NEXT_FCHMOD(handle, fsp, fd, mode);
 276
 277         syslog(audit_syslog_priority(handle), "fchmod %s mode 0x%x %s%s\n",
 278                fsp->fsp_name, mode,
 279                (result < 0) ? "failed: " : "",
 280                (result < 0) ? strerror(errno) : "");
 281
 282         return result;
 283 }
 284
 285 static int audit_fchmod_acl(vfs_handle_struct *handle, files_struct *fsp, int fd, mode_t mode)
 286 {
 287         int result;
 288
 289         result = SMB_VFS_NEXT_FCHMOD_ACL(handle, fsp, fd, mode);
 290
 291         syslog(audit_syslog_priority(handle), "fchmod_acl %s mode 0x%x %s%s\n",
 292                fsp->fsp_name, mode,
 293                (result < 0) ? "failed: " : "",
 294                (result < 0) ? strerror(errno) : "");
 295
 296         return result;
 297 }
 298
 299 NTSTATUS vfs_audit_init(void);
 300 NTSTATUS vfs_audit_init(void)
 301 {
 302         return smb_register_vfs(SMB_VFS_INTERFACE_VERSION, "audit", audit_op_tuples);
 303 }