source3/modules/vfs_extd_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) John H Terpstra, 2003
   8  * Copyright (C) Stefan (metze) Metzmacher, 2003
   9  *
  10  * This program is free software; you can redistribute it and/or modify
  11  * it under the terms of the GNU General Public License as published by
  12  * the Free Software Foundation; either version 3 of the License, or
  13  * (at your option) any later version.
  14  *
  15  * This program is distributed in the hope that it will be useful,
  16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18  * GNU General Public License for more details.
  19  *
  20  * You should have received a copy of the GNU General Public License
  21  * along with this program; if not, see <http://www.gnu.org/licenses/>.
  22  */
  23
  24
  25 #include "includes.h"
  26 #include "system/filesys.h"
  27 #include "system/syslog.h"
  28 #include "smbd/smbd.h"
  29 #include "lib/param/loadparm.h"
  30
  31 static int vfs_extd_audit_debug_level = DBGC_VFS;
  32
  33 #undef DBGC_CLASS
  34 #define DBGC_CLASS vfs_extd_audit_debug_level
  35
  36 static int audit_syslog_facility(vfs_handle_struct *handle)
  37 {
  38         static const struct enum_list enum_log_facilities[] = {
  39 #ifdef LOG_AUTH
  40                 { LOG_AUTH,             "AUTH" },
  41 #endif
  42 #ifdef LOG_AUTHPRIV
  43                 { LOG_AUTHPRIV,         "AUTHPRIV" },
  44 #endif
  45 #ifdef LOG_AUDIT
  46                 { LOG_AUDIT,            "AUDIT" },
  47 #endif
  48 #ifdef LOG_CONSOLE
  49                 { LOG_CONSOLE,          "CONSOLE" },
  50 #endif
  51 #ifdef LOG_CRON
  52                 { LOG_CRON,             "CRON" },
  53 #endif
  54 #ifdef LOG_DAEMON
  55                 { LOG_DAEMON,           "DAEMON" },
  56 #endif
  57 #ifdef LOG_FTP
  58                 { LOG_FTP,              "FTP" },
  59 #endif
  60 #ifdef LOG_INSTALL
  61                 { LOG_INSTALL,          "INSTALL" },
  62 #endif
  63 #ifdef LOG_KERN
  64                 { LOG_KERN,             "KERN" },
  65 #endif
  66 #ifdef LOG_LAUNCHD
  67                 { LOG_LAUNCHD,          "LAUNCHD" },
  68 #endif
  69 #ifdef LOG_LFMT
  70                 { LOG_LFMT,             "LFMT" },
  71 #endif
  72 #ifdef LOG_LPR
  73                 { LOG_LPR,              "LPR" },
  74 #endif
  75 #ifdef LOG_MAIL
  76                 { LOG_MAIL,             "MAIL" },
  77 #endif
  78 #ifdef LOG_MEGASAFE
  79                 { LOG_MEGASAFE,         "MEGASAFE" },
  80 #endif
  81 #ifdef LOG_NETINFO
  82                 { LOG_NETINFO,          "NETINFO" },
  83 #endif
  84 #ifdef LOG_NEWS
  85                 { LOG_NEWS,             "NEWS" },
  86 #endif
  87 #ifdef LOG_NFACILITIES
  88                 { LOG_NFACILITIES,      "NFACILITIES" },
  89 #endif
  90 #ifdef LOG_NTP
  91                 { LOG_NTP,              "NTP" },
  92 #endif
  93 #ifdef LOG_RAS
  94                 { LOG_RAS,              "RAS" },
  95 #endif
  96 #ifdef LOG_REMOTEAUTH
  97                 { LOG_REMOTEAUTH,       "REMOTEAUTH" },
  98 #endif
  99 #ifdef LOG_SECURITY
 100                 { LOG_SECURITY,         "SECURITY" },
 101 #endif
 102 #ifdef LOG_SYSLOG
 103                 { LOG_SYSLOG,           "SYSLOG" },
 104 #endif
 105 #ifdef LOG_USER
 106                 { LOG_USER,             "USER" },
 107 #endif
 108 #ifdef LOG_UUCP
 109                 { LOG_UUCP,             "UUCP" },
 110 #endif
 111                 { LOG_LOCAL0,           "LOCAL0" },
 112                 { LOG_LOCAL1,           "LOCAL1" },
 113                 { LOG_LOCAL2,           "LOCAL2" },
 114                 { LOG_LOCAL3,           "LOCAL3" },
 115                 { LOG_LOCAL4,           "LOCAL4" },
 116                 { LOG_LOCAL5,           "LOCAL5" },
 117                 { LOG_LOCAL6,           "LOCAL6" },
 118                 { LOG_LOCAL7,           "LOCAL7" },
 119                 { -1,                   NULL }
 120         };
 121
 122         int facility;
 123
 124         facility = lp_parm_enum(SNUM(handle->conn), "extd_audit", "facility", enum_log_facilities, LOG_USER);
 125
 126         return facility;
 127 }
 128
 129
 130 static int audit_syslog_priority(vfs_handle_struct *handle)
 131 {
 132         static const struct enum_list enum_log_priorities[] = {
 133                 { LOG_EMERG, "EMERG" },
 134                 { LOG_ALERT, "ALERT" },
 135                 { LOG_CRIT, "CRIT" },
 136                 { LOG_ERR, "ERR" },
 137                 { LOG_WARNING, "WARNING" },
 138                 { LOG_NOTICE, "NOTICE" },
 139                 { LOG_INFO, "INFO" },
 140                 { LOG_DEBUG, "DEBUG" },
 141                 { -1, NULL }
 142         };
 143
 144         int priority;
 145
 146         priority = lp_parm_enum(SNUM(handle->conn), "extd_audit", "priority",
 147                                 enum_log_priorities, LOG_NOTICE);
 148         if (priority == -1) {
 149                 priority = LOG_WARNING;
 150         }
 151
 152         return priority;
 153 }
 154
 155 /* Implementation of vfs_ops.  Pass everything on to the default
 156    operation but log event first. */
 157
 158 static int audit_connect(vfs_handle_struct *handle, const char *svc, const char *user)
 159 {
 160         int result = SMB_VFS_NEXT_CONNECT(handle, svc, user);
 161
 162         if (result < 0) {
 163                 return result;
 164         }
 165
 166         openlog("smbd_audit", LOG_PID, audit_syslog_facility(handle));
 167
 168         if (lp_syslog() > 0) {
 169                 syslog(audit_syslog_priority(handle),
 170                        "connect to service %s by user %s\n",
 171                        svc, user);
 172         }
 173         DEBUG(10, ("Connected to service %s as user %s\n",
 174                svc, user));
 175
 176         return 0;
 177 }
 178
 179 static void audit_disconnect(vfs_handle_struct *handle)
 180 {
 181         if (lp_syslog() > 0) {
 182                 syslog(audit_syslog_priority(handle), "disconnected\n");
 183         }
 184         DEBUG(10, ("Disconnected from VFS module extd_audit\n"));
 185         SMB_VFS_NEXT_DISCONNECT(handle);
 186
 187         return;
 188 }
 189
 190 static int audit_mkdirat(vfs_handle_struct *handle,
 191                         struct files_struct *dirfsp,
 192                         const struct smb_filename *smb_fname,
 193                         mode_t mode)
 194 {
 195         struct smb_filename *full_fname = NULL;
 196         int result;
 197
 198         full_fname = full_path_from_dirfsp_atname(talloc_tos(),
 199                                                   dirfsp,
 200                                                   smb_fname);
 201         if (full_fname == NULL) {
 202                 errno = ENOMEM;
 203                 return -1;
 204         }
 205
 206         result = SMB_VFS_NEXT_MKDIRAT(handle,
 207                         dirfsp,
 208                         smb_fname,
 209                         mode);
 210
 211         if (lp_syslog() > 0) {
 212                 syslog(audit_syslog_priority(handle), "mkdirat %s %s%s\n",
 213                        full_fname->base_name,
 214                        (result < 0) ? "failed: " : "",
 215                        (result < 0) ? strerror(errno) : "");
 216         }
 217         DEBUG(0, ("vfs_extd_audit: mkdirat %s %s %s\n",
 218                full_fname->base_name,
 219                (result < 0) ? "failed: " : "",
 220                (result < 0) ? strerror(errno) : ""));
 221
 222         TALLOC_FREE(full_fname);
 223         return result;
 224 }
 225
 226 static int audit_openat(vfs_handle_struct *handle,
 227                         const struct files_struct *dirfsp,
 228                         const struct smb_filename *smb_fname,
 229                         files_struct *fsp,
 230                         const struct vfs_open_how *how)
 231 {
 232         int ret;
 233
 234         ret = SMB_VFS_NEXT_OPENAT(handle, dirfsp, smb_fname, fsp, how);
 235
 236         if (lp_syslog() > 0) {
 237                 syslog(audit_syslog_priority(handle),
 238                        "openat %s/%s (fd %d) %s%s%s\n",
 239                        smb_fname_str_dbg(fsp->fsp_name),
 240                        smb_fname->base_name,
 241                        ret,
 242                        ((how->flags & O_WRONLY) || (how->flags & O_RDWR)) ?
 243                        "for writing " : "",
 244                        (ret < 0) ? "failed: " : "",
 245                        (ret < 0) ? strerror(errno) : "");
 246         }
 247         DEBUG(2, ("vfs_extd_audit: open %s/%s %s %s\n",
 248                smb_fname_str_dbg(fsp->fsp_name),
 249                smb_fname_str_dbg(smb_fname),
 250                (ret < 0) ? "failed: " : "",
 251                (ret < 0) ? strerror(errno) : ""));
 252
 253         return ret;
 254 }
 255
 256 static int audit_close(vfs_handle_struct *handle, files_struct *fsp)
 257 {
 258         int result;
 259
 260         result = SMB_VFS_NEXT_CLOSE(handle, fsp);
 261
 262         if (lp_syslog() > 0) {
 263                 syslog(audit_syslog_priority(handle), "close fd %d %s%s\n",
 264                        fsp_get_pathref_fd(fsp),
 265                        (result < 0) ? "failed: " : "",
 266                        (result < 0) ? strerror(errno) : "");
 267         }
 268         DEBUG(2, ("vfs_extd_audit: close fd %d %s %s\n",
 269                fsp_get_pathref_fd(fsp),
 270                (result < 0) ? "failed: " : "",
 271                (result < 0) ? strerror(errno) : ""));
 272
 273         return result;
 274 }
 275
 276 static int audit_renameat(vfs_handle_struct *handle,
 277                         files_struct *srcfsp,
 278                         const struct smb_filename *smb_fname_src,
 279                         files_struct *dstfsp,
 280                         const struct smb_filename *smb_fname_dst)
 281 {
 282         struct smb_filename *full_fname_src = NULL;
 283         struct smb_filename *full_fname_dst = NULL;
 284         int result;
 285         int saved_errno = 0;
 286
 287         full_fname_src = full_path_from_dirfsp_atname(talloc_tos(),
 288                                                       srcfsp,
 289                                                       smb_fname_src);
 290         if (full_fname_src == NULL) {
 291                 errno = ENOMEM;
 292                 return -1;
 293         }
 294
 295         full_fname_dst = full_path_from_dirfsp_atname(talloc_tos(),
 296                                                       dstfsp,
 297                                                       smb_fname_dst);
 298         if (full_fname_dst == NULL) {
 299                 TALLOC_FREE(full_fname_src);
 300                 errno = ENOMEM;
 301                 return -1;
 302         }
 303
 304         result = SMB_VFS_NEXT_RENAMEAT(handle,
 305                         srcfsp,
 306                         smb_fname_src,
 307                         dstfsp,
 308                         smb_fname_dst);
 309         if (result == -1) {
 310                 saved_errno = errno;
 311         }
 312         if (lp_syslog() > 0) {
 313                 syslog(audit_syslog_priority(handle), "renameat %s -> %s %s%s\n",
 314                        full_fname_src->base_name,
 315                        full_fname_dst->base_name,
 316                        (result < 0) ? "failed: " : "",
 317                        (result < 0) ? strerror(saved_errno) : "");
 318         }
 319         DEBUG(1, ("vfs_extd_audit: renameat old: %s newname: %s  %s %s\n",
 320                 smb_fname_str_dbg(full_fname_src),
 321                 smb_fname_str_dbg(full_fname_dst),
 322                (result < 0) ? "failed: " : "",
 323                (result < 0) ? strerror(saved_errno) : ""));
 324
 325         TALLOC_FREE(full_fname_src);
 326         TALLOC_FREE(full_fname_dst);
 327
 328         if (result == -1)  {
 329                 errno = saved_errno;
 330         }
 331         return result;
 332 }
 333
 334 static int audit_unlinkat(vfs_handle_struct *handle,
 335                         struct files_struct *dirfsp,
 336                         const struct smb_filename *smb_fname,
 337                         int flags)
 338 {
 339         struct smb_filename *full_fname = NULL;
 340         int result;
 341
 342         full_fname = full_path_from_dirfsp_atname(talloc_tos(),
 343                                                   dirfsp,
 344                                                   smb_fname);
 345         if (full_fname == NULL) {
 346                 return -1;
 347         }
 348
 349         result = SMB_VFS_NEXT_UNLINKAT(handle,
 350                         dirfsp,
 351                         smb_fname,
 352                         flags);
 353
 354         if (lp_syslog() > 0) {
 355                 syslog(audit_syslog_priority(handle), "unlinkat %s %s%s\n",
 356                        full_fname->base_name,
 357                        (result < 0) ? "failed: " : "",
 358                        (result < 0) ? strerror(errno) : "");
 359         }
 360         DBG_ERR("unlinkat %s %s %s\n",
 361                smb_fname_str_dbg(full_fname),
 362                (result < 0) ? "failed: " : "",
 363                (result < 0) ? strerror(errno) : "");
 364
 365         TALLOC_FREE(full_fname);
 366         return result;
 367 }
 368
 369 static int audit_fchmod(vfs_handle_struct *handle, files_struct *fsp, mode_t mode)
 370 {
 371         int result;
 372
 373         result = SMB_VFS_NEXT_FCHMOD(handle, fsp, mode);
 374
 375         if (lp_syslog() > 0) {
 376                 syslog(audit_syslog_priority(handle), "fchmod %s mode 0x%x %s%s\n",
 377                        fsp->fsp_name->base_name, mode,
 378                        (result < 0) ? "failed: " : "",
 379                        (result < 0) ? strerror(errno) : "");
 380         }
 381         DEBUG(1, ("vfs_extd_audit: fchmod %s mode 0x%x %s %s\n",
 382                fsp_str_dbg(fsp), (unsigned int)mode,
 383                (result < 0) ? "failed: " : "",
 384                (result < 0) ? strerror(errno) : ""));
 385
 386         return result;
 387 }
 388
 389 static struct vfs_fn_pointers vfs_extd_audit_fns = {
 390         .connect_fn = audit_connect,
 391         .disconnect_fn = audit_disconnect,
 392         .mkdirat_fn = audit_mkdirat,
 393         .openat_fn = audit_openat,
 394         .close_fn = audit_close,
 395         .renameat_fn = audit_renameat,
 396         .unlinkat_fn = audit_unlinkat,
 397         .fchmod_fn = audit_fchmod,
 398 };
 399
 400 static_decl_vfs;
 401 NTSTATUS vfs_extd_audit_init(TALLOC_CTX *ctx)
 402 {
 403         NTSTATUS ret = smb_register_vfs(SMB_VFS_INTERFACE_VERSION,
 404                                         "extd_audit", &vfs_extd_audit_fns);
 405
 406         if (!NT_STATUS_IS_OK(ret))
 407                 return ret;
 408
 409         vfs_extd_audit_debug_level = debug_add_class("extd_audit");
 410         if (vfs_extd_audit_debug_level == -1) {
 411                 vfs_extd_audit_debug_level = DBGC_VFS;
 412                 DEBUG(0, ("vfs_extd_audit: Couldn't register custom debugging class!\n"));
 413         } else {
 414                 DEBUG(10, ("vfs_extd_audit: Debug class number of 'extd_audit': %d\n", vfs_extd_audit_debug_level));
 415         }
 416
 417         return ret;
 418 }