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 #include "system/filesys.h"
  26 #include "system/syslog.h"
  27 #include "smbd/smbd.h"
  28 #include "lib/param/loadparm.h"
  29
  30 #undef DBGC_CLASS
  31 #define DBGC_CLASS DBGC_VFS
  32
  33 static int audit_syslog_facility(vfs_handle_struct *handle)
  34 {
  35         static const struct enum_list enum_log_facilities[] = {
  36                 { LOG_USER, "USER" },
  37                 { LOG_LOCAL0, "LOCAL0" },
  38                 { LOG_LOCAL1, "LOCAL1" },
  39                 { LOG_LOCAL2, "LOCAL2" },
  40                 { LOG_LOCAL3, "LOCAL3" },
  41                 { LOG_LOCAL4, "LOCAL4" },
  42                 { LOG_LOCAL5, "LOCAL5" },
  43                 { LOG_LOCAL6, "LOCAL6" },
  44                 { LOG_LOCAL7, "LOCAL7" },
  45                 { -1, NULL}
  46         };
  47
  48         int facility;
  49
  50         facility = lp_parm_enum(SNUM(handle->conn), "audit", "facility", enum_log_facilities, LOG_USER);
  51
  52         return facility;
  53 }
  54
  55
  56 static int audit_syslog_priority(vfs_handle_struct *handle)
  57 {
  58         static const struct enum_list enum_log_priorities[] = {
  59                 { LOG_EMERG, "EMERG" },
  60                 { LOG_ALERT, "ALERT" },
  61                 { LOG_CRIT, "CRIT" },
  62                 { LOG_ERR, "ERR" },
  63                 { LOG_WARNING, "WARNING" },
  64                 { LOG_NOTICE, "NOTICE" },
  65                 { LOG_INFO, "INFO" },
  66                 { LOG_DEBUG, "DEBUG" },
  67                 { -1, NULL}
  68         };
  69
  70         int priority;
  71
  72         priority = lp_parm_enum(SNUM(handle->conn), "audit", "priority",
  73                                 enum_log_priorities, LOG_NOTICE);
  74         if (priority == -1) {
  75                 priority = LOG_WARNING;
  76         }
  77
  78         return priority;
  79 }
  80
  81 /* Implementation of vfs_ops.  Pass everything on to the default
  82    operation but log event first. */
  83
  84 static int audit_connect(vfs_handle_struct *handle, const char *svc, const char *user)
  85 {
  86         int result;
  87
  88         result = SMB_VFS_NEXT_CONNECT(handle, svc, user);
  89         if (result < 0) {
  90                 return result;
  91         }
  92
  93         openlog("smbd_audit", LOG_PID, audit_syslog_facility(handle));
  94
  95         syslog(audit_syslog_priority(handle), "connect to service %s by user %s\n",
  96                svc, user);
  97
  98         return 0;
  99 }
 100
 101 static void audit_disconnect(vfs_handle_struct *handle)
 102 {
 103         syslog(audit_syslog_priority(handle), "disconnected\n");
 104         SMB_VFS_NEXT_DISCONNECT(handle);
 105
 106         return;
 107 }
 108
 109 static DIR *audit_opendir(vfs_handle_struct *handle,
 110                         const struct smb_filename *smb_fname,
 111                         const char *mask,
 112                         uint32_t attr)
 113 {
 114         DIR *result;
 115
 116         result = SMB_VFS_NEXT_OPENDIR(handle, smb_fname, mask, attr);
 117
 118         syslog(audit_syslog_priority(handle), "opendir %s %s%s\n",
 119                smb_fname->base_name,
 120                (result == NULL) ? "failed: " : "",
 121                (result == NULL) ? strerror(errno) : "");
 122
 123         return result;
 124 }
 125
 126 static int audit_mkdir(vfs_handle_struct *handle,
 127                 const struct smb_filename *smb_fname,
 128                 mode_t mode)
 129 {
 130         int result;
 131
 132         result = SMB_VFS_NEXT_MKDIR(handle, smb_fname, mode);
 133
 134         syslog(audit_syslog_priority(handle), "mkdir %s %s%s\n",
 135                smb_fname->base_name,
 136                (result < 0) ? "failed: " : "",
 137                (result < 0) ? strerror(errno) : "");
 138
 139         return result;
 140 }
 141
 142 static int audit_rmdir(vfs_handle_struct *handle,
 143                 const struct smb_filename *smb_fname)
 144 {
 145         int result;
 146
 147         result = SMB_VFS_NEXT_RMDIR(handle, smb_fname);
 148
 149         syslog(audit_syslog_priority(handle), "rmdir %s %s%s\n",
 150                smb_fname->base_name,
 151                (result < 0) ? "failed: " : "",
 152                (result < 0) ? strerror(errno) : "");
 153
 154         return result;
 155 }
 156
 157 static int audit_open(vfs_handle_struct *handle,
 158                       struct smb_filename *smb_fname, files_struct *fsp,
 159                       int flags, mode_t mode)
 160 {
 161         int result;
 162
 163         result = SMB_VFS_NEXT_OPEN(handle, smb_fname, fsp, flags, mode);
 164
 165         syslog(audit_syslog_priority(handle), "open %s (fd %d) %s%s%s\n",
 166                smb_fname->base_name, 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 static int audit_close(vfs_handle_struct *handle, files_struct *fsp)
 175 {
 176         int result;
 177
 178         result = SMB_VFS_NEXT_CLOSE(handle, fsp);
 179
 180         syslog(audit_syslog_priority(handle), "close fd %d %s%s\n",
 181                fsp->fh->fd,
 182                (result < 0) ? "failed: " : "",
 183                (result < 0) ? strerror(errno) : "");
 184
 185         return result;
 186 }
 187
 188 static int audit_rename(vfs_handle_struct *handle,
 189                         const struct smb_filename *smb_fname_src,
 190                         const struct smb_filename *smb_fname_dst)
 191 {
 192         int result;
 193
 194         result = SMB_VFS_NEXT_RENAME(handle, smb_fname_src, smb_fname_dst);
 195
 196         syslog(audit_syslog_priority(handle), "rename %s -> %s %s%s\n",
 197                smb_fname_src->base_name,
 198                smb_fname_dst->base_name,
 199                (result < 0) ? "failed: " : "",
 200                (result < 0) ? strerror(errno) : "");
 201
 202         return result;
 203 }
 204
 205 static int audit_unlink(vfs_handle_struct *handle,
 206                         const struct smb_filename *smb_fname)
 207 {
 208         int result;
 209
 210         result = SMB_VFS_NEXT_UNLINK(handle, smb_fname);
 211
 212         syslog(audit_syslog_priority(handle), "unlink %s %s%s\n",
 213                smb_fname->base_name,
 214                (result < 0) ? "failed: " : "",
 215                (result < 0) ? strerror(errno) : "");
 216
 217         return result;
 218 }
 219
 220 static int audit_chmod(vfs_handle_struct *handle,
 221                         const struct smb_filename *smb_fname,
 222                         mode_t mode)
 223 {
 224         int result;
 225
 226         result = SMB_VFS_NEXT_CHMOD(handle, smb_fname, mode);
 227
 228         syslog(audit_syslog_priority(handle), "chmod %s mode 0x%x %s%s\n",
 229                smb_fname->base_name, mode,
 230                (result < 0) ? "failed: " : "",
 231                (result < 0) ? strerror(errno) : "");
 232
 233         return result;
 234 }
 235
 236 static int audit_chmod_acl(vfs_handle_struct *handle,
 237                         const struct smb_filename *smb_fname,
 238                         mode_t mode)
 239 {
 240         int result;
 241
 242         result = SMB_VFS_NEXT_CHMOD_ACL(handle, smb_fname, mode);
 243
 244         syslog(audit_syslog_priority(handle), "chmod_acl %s mode 0x%x %s%s\n",
 245                smb_fname->base_name, mode,
 246                (result < 0) ? "failed: " : "",
 247                (result < 0) ? strerror(errno) : "");
 248
 249         return result;
 250 }
 251
 252 static int audit_fchmod(vfs_handle_struct *handle, files_struct *fsp, mode_t mode)
 253 {
 254         int result;
 255
 256         result = SMB_VFS_NEXT_FCHMOD(handle, fsp, mode);
 257
 258         syslog(audit_syslog_priority(handle), "fchmod %s mode 0x%x %s%s\n",
 259                fsp->fsp_name->base_name, mode,
 260                (result < 0) ? "failed: " : "",
 261                (result < 0) ? strerror(errno) : "");
 262
 263         return result;
 264 }
 265
 266 static int audit_fchmod_acl(vfs_handle_struct *handle, files_struct *fsp, mode_t mode)
 267 {
 268         int result;
 269
 270         result = SMB_VFS_NEXT_FCHMOD_ACL(handle, fsp, mode);
 271
 272         syslog(audit_syslog_priority(handle), "fchmod_acl %s mode 0x%x %s%s\n",
 273                fsp->fsp_name->base_name, mode,
 274                (result < 0) ? "failed: " : "",
 275                (result < 0) ? strerror(errno) : "");
 276
 277         return result;
 278 }
 279
 280 static struct vfs_fn_pointers vfs_audit_fns = {
 281         .connect_fn = audit_connect,
 282         .disconnect_fn = audit_disconnect,
 283         .opendir_fn = audit_opendir,
 284         .mkdir_fn = audit_mkdir,
 285         .rmdir_fn = audit_rmdir,
 286         .open_fn = audit_open,
 287         .close_fn = audit_close,
 288         .rename_fn = audit_rename,
 289         .unlink_fn = audit_unlink,
 290         .chmod_fn = audit_chmod,
 291         .fchmod_fn = audit_fchmod,
 292         .chmod_acl_fn = audit_chmod_acl,
 293         .fchmod_acl_fn = audit_fchmod_acl
 294 };
 295
 296 static_decl_vfs;
 297 NTSTATUS vfs_audit_init(TALLOC_CTX *ctx)
 298 {
 299         return smb_register_vfs(SMB_VFS_INTERFACE_VERSION, "audit",
 300                                 &vfs_audit_fns);
 301 }