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 #ifdef LOG_AUTH
  37                 { LOG_AUTH,             "AUTH" },
  38 #endif
  39 #ifdef LOG_AUTHPRIV
  40                 { LOG_AUTHPRIV,         "AUTHPRIV" },
  41 #endif
  42 #ifdef LOG_AUDIT
  43                 { LOG_AUDIT,            "AUDIT" },
  44 #endif
  45 #ifdef LOG_CONSOLE
  46                 { LOG_CONSOLE,          "CONSOLE" },
  47 #endif
  48 #ifdef LOG_CRON
  49                 { LOG_CRON,             "CRON" },
  50 #endif
  51 #ifdef LOG_DAEMON
  52                 { LOG_DAEMON,           "DAEMON" },
  53 #endif
  54 #ifdef LOG_FTP
  55                 { LOG_FTP,              "FTP" },
  56 #endif
  57 #ifdef LOG_INSTALL
  58                 { LOG_INSTALL,          "INSTALL" },
  59 #endif
  60 #ifdef LOG_KERN
  61                 { LOG_KERN,             "KERN" },
  62 #endif
  63 #ifdef LOG_LAUNCHD
  64                 { LOG_LAUNCHD,          "LAUNCHD" },
  65 #endif
  66 #ifdef LOG_LFMT
  67                 { LOG_LFMT,             "LFMT" },
  68 #endif
  69 #ifdef LOG_LPR
  70                 { LOG_LPR,              "LPR" },
  71 #endif
  72 #ifdef LOG_MAIL
  73                 { LOG_MAIL,             "MAIL" },
  74 #endif
  75 #ifdef LOG_MEGASAFE
  76                 { LOG_MEGASAFE,         "MEGASAFE" },
  77 #endif
  78 #ifdef LOG_NETINFO
  79                 { LOG_NETINFO,          "NETINFO" },
  80 #endif
  81 #ifdef LOG_NEWS
  82                 { LOG_NEWS,             "NEWS" },
  83 #endif
  84 #ifdef LOG_NFACILITIES
  85                 { LOG_NFACILITIES,      "NFACILITIES" },
  86 #endif
  87 #ifdef LOG_NTP
  88                 { LOG_NTP,              "NTP" },
  89 #endif
  90 #ifdef LOG_RAS
  91                 { LOG_RAS,              "RAS" },
  92 #endif
  93 #ifdef LOG_REMOTEAUTH
  94                 { LOG_REMOTEAUTH,       "REMOTEAUTH" },
  95 #endif
  96 #ifdef LOG_SECURITY
  97                 { LOG_SECURITY,         "SECURITY" },
  98 #endif
  99 #ifdef LOG_SYSLOG
 100                 { LOG_SYSLOG,           "SYSLOG" },
 101 #endif
 102 #ifdef LOG_USER
 103                 { LOG_USER,             "USER" },
 104 #endif
 105 #ifdef LOG_UUCP
 106                 { LOG_UUCP,             "UUCP" },
 107 #endif
 108                 { LOG_LOCAL0,           "LOCAL0" },
 109                 { LOG_LOCAL1,           "LOCAL1" },
 110                 { LOG_LOCAL2,           "LOCAL2" },
 111                 { LOG_LOCAL3,           "LOCAL3" },
 112                 { LOG_LOCAL4,           "LOCAL4" },
 113                 { LOG_LOCAL5,           "LOCAL5" },
 114                 { LOG_LOCAL6,           "LOCAL6" },
 115                 { LOG_LOCAL7,           "LOCAL7" },
 116                 { -1,                   NULL }
 117         };
 118
 119         int facility;
 120
 121         facility = lp_parm_enum(SNUM(handle->conn), "audit", "facility", enum_log_facilities, LOG_USER);
 122
 123         return facility;
 124 }
 125
 126
 127 static int audit_syslog_priority(vfs_handle_struct *handle)
 128 {
 129         static const struct enum_list enum_log_priorities[] = {
 130                 { LOG_EMERG, "EMERG" },
 131                 { LOG_ALERT, "ALERT" },
 132                 { LOG_CRIT, "CRIT" },
 133                 { LOG_ERR, "ERR" },
 134                 { LOG_WARNING, "WARNING" },
 135                 { LOG_NOTICE, "NOTICE" },
 136                 { LOG_INFO, "INFO" },
 137                 { LOG_DEBUG, "DEBUG" },
 138                 { -1, NULL }
 139         };
 140
 141         int priority;
 142
 143         priority = lp_parm_enum(SNUM(handle->conn), "audit", "priority",
 144                                 enum_log_priorities, LOG_NOTICE);
 145         if (priority == -1) {
 146                 priority = LOG_WARNING;
 147         }
 148
 149         return priority;
 150 }
 151
 152 /* Implementation of vfs_ops.  Pass everything on to the default
 153    operation but log event first. */
 154
 155 static int audit_connect(vfs_handle_struct *handle, const char *svc, const char *user)
 156 {
 157         int result;
 158
 159         result = SMB_VFS_NEXT_CONNECT(handle, svc, user);
 160         if (result < 0) {
 161                 return result;
 162         }
 163
 164         openlog("smbd_audit", LOG_PID, audit_syslog_facility(handle));
 165
 166         syslog(audit_syslog_priority(handle), "connect to service %s by user %s\n",
 167                svc, user);
 168
 169         return 0;
 170 }
 171
 172 static void audit_disconnect(vfs_handle_struct *handle)
 173 {
 174         syslog(audit_syslog_priority(handle), "disconnected\n");
 175         SMB_VFS_NEXT_DISCONNECT(handle);
 176
 177         return;
 178 }
 179
 180 static int audit_mkdirat(vfs_handle_struct *handle,
 181                 struct files_struct *dirfsp,
 182                 const struct smb_filename *smb_fname,
 183                 mode_t mode)
 184 {
 185         struct smb_filename *full_fname = NULL;
 186         int result;
 187
 188         full_fname = full_path_from_dirfsp_atname(talloc_tos(),
 189                                                   dirfsp,
 190                                                   smb_fname);
 191         if (full_fname == NULL) {
 192                 errno = ENOMEM;
 193                 return -1;
 194         }
 195
 196         result = SMB_VFS_NEXT_MKDIRAT(handle,
 197                         dirfsp,
 198                         smb_fname,
 199                         mode);
 200
 201         syslog(audit_syslog_priority(handle), "mkdirat %s %s%s\n",
 202                full_fname->base_name,
 203                (result < 0) ? "failed: " : "",
 204                (result < 0) ? strerror(errno) : "");
 205
 206         TALLOC_FREE(full_fname);
 207         return result;
 208 }
 209
 210 static int audit_openat(vfs_handle_struct *handle,
 211                         const struct files_struct *dirfsp,
 212                         const struct smb_filename *smb_fname,
 213                         struct files_struct *fsp,
 214                         const struct vfs_open_how *how)
 215 {
 216         int result;
 217
 218         result = SMB_VFS_NEXT_OPENAT(handle, dirfsp, smb_fname, fsp, how);
 219
 220         syslog(audit_syslog_priority(handle),
 221                "openat %s (fd %d) %s%s%s\n",
 222                fsp_str_dbg(fsp), result,
 223                ((how->flags & O_WRONLY) || (how->flags & O_RDWR)) ?
 224                "for writing " : "",
 225                (result < 0) ? "failed: " : "",
 226                (result < 0) ? strerror(errno) : "");
 227
 228         return result;
 229 }
 230
 231 static int audit_close(vfs_handle_struct *handle, files_struct *fsp)
 232 {
 233         int result;
 234
 235         result = SMB_VFS_NEXT_CLOSE(handle, fsp);
 236
 237         syslog(audit_syslog_priority(handle), "close fd %d %s%s\n",
 238                fsp_get_pathref_fd(fsp),
 239                (result < 0) ? "failed: " : "",
 240                (result < 0) ? strerror(errno) : "");
 241
 242         return result;
 243 }
 244
 245 static int audit_renameat(vfs_handle_struct *handle,
 246                         files_struct *srcfsp,
 247                         const struct smb_filename *smb_fname_src,
 248                         files_struct *dstfsp,
 249                         const struct smb_filename *smb_fname_dst)
 250 {
 251         struct smb_filename *full_fname_src = NULL;
 252         struct smb_filename *full_fname_dst = NULL;
 253         int result;
 254         int saved_errno = 0;
 255
 256         full_fname_src = full_path_from_dirfsp_atname(talloc_tos(),
 257                                                   srcfsp,
 258                                                   smb_fname_src);
 259         if (full_fname_src == NULL) {
 260                 errno = ENOMEM;
 261                 return -1;
 262         }
 263         full_fname_dst = full_path_from_dirfsp_atname(talloc_tos(),
 264                                                   dstfsp,
 265                                                   smb_fname_dst);
 266         if (full_fname_dst == NULL) {
 267                 TALLOC_FREE(full_fname_src);
 268                 errno = ENOMEM;
 269                 return -1;
 270         }
 271         result = SMB_VFS_NEXT_RENAMEAT(handle,
 272                         srcfsp,
 273                         smb_fname_src,
 274                         dstfsp,
 275                         smb_fname_dst);
 276         if (result == -1) {
 277                 saved_errno = errno;
 278         }
 279
 280         syslog(audit_syslog_priority(handle), "renameat %s -> %s %s%s\n",
 281                full_fname_src->base_name,
 282                full_fname_dst->base_name,
 283                (result < 0) ? "failed: " : "",
 284                (result < 0) ? strerror(errno) : "");
 285
 286         TALLOC_FREE(full_fname_src);
 287         TALLOC_FREE(full_fname_dst);
 288
 289         if (saved_errno != 0) {
 290                 errno = saved_errno;
 291         }
 292
 293         return result;
 294 }
 295
 296 static int audit_unlinkat(vfs_handle_struct *handle,
 297                         struct files_struct *dirfsp,
 298                         const struct smb_filename *smb_fname,
 299                         int flags)
 300 {
 301         struct smb_filename *full_fname = NULL;
 302         int result;
 303
 304         full_fname = full_path_from_dirfsp_atname(talloc_tos(),
 305                                                   dirfsp,
 306                                                   smb_fname);
 307         if (full_fname == NULL) {
 308                 return -1;
 309         }
 310
 311         result = SMB_VFS_NEXT_UNLINKAT(handle,
 312                         dirfsp,
 313                         smb_fname,
 314                         flags);
 315
 316         syslog(audit_syslog_priority(handle), "unlinkat %s %s%s\n",
 317                full_fname->base_name,
 318                (result < 0) ? "failed: " : "",
 319                (result < 0) ? strerror(errno) : "");
 320
 321         TALLOC_FREE(full_fname);
 322         return result;
 323 }
 324
 325 static int audit_fchmod(vfs_handle_struct *handle, files_struct *fsp, mode_t mode)
 326 {
 327         int result;
 328
 329         result = SMB_VFS_NEXT_FCHMOD(handle, fsp, mode);
 330
 331         syslog(audit_syslog_priority(handle), "fchmod %s mode 0x%x %s%s\n",
 332                fsp->fsp_name->base_name, mode,
 333                (result < 0) ? "failed: " : "",
 334                (result < 0) ? strerror(errno) : "");
 335
 336         return result;
 337 }
 338
 339 static struct vfs_fn_pointers vfs_audit_fns = {
 340         .connect_fn = audit_connect,
 341         .disconnect_fn = audit_disconnect,
 342         .mkdirat_fn = audit_mkdirat,
 343         .openat_fn = audit_openat,
 344         .close_fn = audit_close,
 345         .renameat_fn = audit_renameat,
 346         .unlinkat_fn = audit_unlinkat,
 347         .fchmod_fn = audit_fchmod,
 348 };
 349
 350 static_decl_vfs;
 351 NTSTATUS vfs_audit_init(TALLOC_CTX *ctx)
 352 {
 353         return smb_register_vfs(SMB_VFS_INTERFACE_VERSION, "audit",
 354                                 &vfs_audit_fns);
 355 }