modules/vfs_extd_audit.c

説明を見る。

/* 
 * Auditing VFS module for samba.  Log selected file operations to syslog
 * facility.
 *
 * Copyright (C) Tim Potter, 1999-2000
 * Copyright (C) Alexander Bokovoy, 2002
 * Copyright (C) John H Terpstra, 2003
 * Copyright (C) Stefan (metze) Metzmacher, 2003
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *  
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *  
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 */


#include "includes.h"

static int vfs_extd_audit_debug_level = DBGC_VFS;

#undef DBGC_CLASS
#define DBGC_CLASS vfs_extd_audit_debug_level

/* Function prototypes */

static int audit_connect(vfs_handle_struct *handle, const char *svc, const char *user);
static void audit_disconnect(vfs_handle_struct *handle);
static SMB_STRUCT_DIR *audit_opendir(vfs_handle_struct *handle, const char *fname, const char *mask, uint32 attr);
static int audit_mkdir(vfs_handle_struct *handle, const char *path, mode_t mode);
static int audit_rmdir(vfs_handle_struct *handle, const char *path);
static int audit_open(vfs_handle_struct *handle, const char *fname, files_struct *fsp, int flags, mode_t mode);
static int audit_close(vfs_handle_struct *handle, files_struct *fsp, int fd);
static int audit_rename(vfs_handle_struct *handle, const char *oldname, const char *newname);
static int audit_unlink(vfs_handle_struct *handle, const char *path);
static int audit_chmod(vfs_handle_struct *handle, const char *path, mode_t mode);
static int audit_chmod_acl(vfs_handle_struct *handle, const char *name, mode_t mode);
static int audit_fchmod(vfs_handle_struct *handle, files_struct *fsp, int fd, mode_t mode);
static int audit_fchmod_acl(vfs_handle_struct *handle, files_struct *fsp, int fd, mode_t mode);

/* VFS operations */

static vfs_op_tuple audit_op_tuples[] = {
    
        /* Disk operations */

        {SMB_VFS_OP(audit_connect),     SMB_VFS_OP_CONNECT,     SMB_VFS_LAYER_LOGGER},
        {SMB_VFS_OP(audit_disconnect),  SMB_VFS_OP_DISCONNECT,  SMB_VFS_LAYER_LOGGER},

        /* Directory operations */

        {SMB_VFS_OP(audit_opendir),     SMB_VFS_OP_OPENDIR,     SMB_VFS_LAYER_LOGGER},
        {SMB_VFS_OP(audit_mkdir),               SMB_VFS_OP_MKDIR,       SMB_VFS_LAYER_LOGGER},
        {SMB_VFS_OP(audit_rmdir),               SMB_VFS_OP_RMDIR,       SMB_VFS_LAYER_LOGGER},

        /* File operations */

        {SMB_VFS_OP(audit_open),                SMB_VFS_OP_OPEN,        SMB_VFS_LAYER_LOGGER},
        {SMB_VFS_OP(audit_close),               SMB_VFS_OP_CLOSE,       SMB_VFS_LAYER_LOGGER},
        {SMB_VFS_OP(audit_rename),              SMB_VFS_OP_RENAME,      SMB_VFS_LAYER_LOGGER},
        {SMB_VFS_OP(audit_unlink),              SMB_VFS_OP_UNLINK,      SMB_VFS_LAYER_LOGGER},
        {SMB_VFS_OP(audit_chmod),               SMB_VFS_OP_CHMOD,       SMB_VFS_LAYER_LOGGER},
        {SMB_VFS_OP(audit_fchmod),              SMB_VFS_OP_FCHMOD,      SMB_VFS_LAYER_LOGGER},
        {SMB_VFS_OP(audit_chmod_acl),   SMB_VFS_OP_CHMOD_ACL,   SMB_VFS_LAYER_LOGGER},
        {SMB_VFS_OP(audit_fchmod_acl),  SMB_VFS_OP_FCHMOD_ACL,  SMB_VFS_LAYER_LOGGER},
        
        /* Finish VFS operations definition */
        
        {SMB_VFS_OP(NULL),                      SMB_VFS_OP_NOOP,        SMB_VFS_LAYER_NOOP}
};


static int audit_syslog_facility(vfs_handle_struct *handle)
{
        static const struct enum_list enum_log_facilities[] = {
                { LOG_USER, "USER" },
                { LOG_LOCAL0, "LOCAL0" },
                { LOG_LOCAL1, "LOCAL1" },
                { LOG_LOCAL2, "LOCAL2" },
                { LOG_LOCAL3, "LOCAL3" },
                { LOG_LOCAL4, "LOCAL4" },
                { LOG_LOCAL5, "LOCAL5" },
                { LOG_LOCAL6, "LOCAL6" },
                { LOG_LOCAL7, "LOCAL7" }
        };

        int facility;

        facility = lp_parm_enum(SNUM(handle->conn), "extd_audit", "facility", enum_log_facilities, LOG_USER);

        return facility;
}


static int audit_syslog_priority(vfs_handle_struct *handle)
{
        static const struct enum_list enum_log_priorities[] = {
                { LOG_EMERG, "EMERG" },
                { LOG_ALERT, "ALERT" },
                { LOG_CRIT, "CRIT" },
                { LOG_ERR, "ERR" },
                { LOG_WARNING, "WARNING" },
                { LOG_NOTICE, "NOTICE" },
                { LOG_INFO, "INFO" },
                { LOG_DEBUG, "DEBUG" }
        };

        int priority;

        priority = lp_parm_enum(SNUM(handle->conn), "extd_audit", "priority", enum_log_priorities, LOG_NOTICE);

        return priority;
}

/* Implementation of vfs_ops.  Pass everything on to the default
   operation but log event first. */

static int audit_connect(vfs_handle_struct *handle, const char *svc, const char *user)
{
        int result;

        openlog("smbd_audit", LOG_PID, audit_syslog_facility(handle));

        syslog(audit_syslog_priority(handle), "connect to service %s by user %s\n", 
               svc, user);
        DEBUG(10, ("Connected to service %s as user %s\n",
               svc, user));

        result = SMB_VFS_NEXT_CONNECT(handle, svc, user);

        return result;
}

static void audit_disconnect(vfs_handle_struct *handle)
{
        syslog(audit_syslog_priority(handle), "disconnected\n");
        DEBUG(10, ("Disconnected from VFS module extd_audit\n"));
        SMB_VFS_NEXT_DISCONNECT(handle);

        return;
}

static SMB_STRUCT_DIR *audit_opendir(vfs_handle_struct *handle, const char *fname, const char *mask, uint32 attr)
{
        SMB_STRUCT_DIR *result;

        result = SMB_VFS_NEXT_OPENDIR(handle, fname, mask, attr);

        syslog(audit_syslog_priority(handle), "opendir %s %s%s\n",
               fname,
               (result == NULL) ? "failed: " : "",
               (result == NULL) ? strerror(errno) : "");
        DEBUG(1, ("vfs_extd_audit: opendir %s %s %s\n",
               fname,
               (result == NULL) ? "failed: " : "",
               (result == NULL) ? strerror(errno) : ""));

        return result;
}

static int audit_mkdir(vfs_handle_struct *handle, const char *path, mode_t mode)
{
        int result;
        
        result = SMB_VFS_NEXT_MKDIR(handle, path, mode);
        
        syslog(audit_syslog_priority(handle), "mkdir %s %s%s\n", 
               path,
               (result < 0) ? "failed: " : "",
               (result < 0) ? strerror(errno) : "");
        DEBUG(0, ("vfs_extd_audit: mkdir %s %s %s\n",
               path,
               (result < 0) ? "failed: " : "",
               (result < 0) ? strerror(errno) : ""));

        return result;
}

static int audit_rmdir(vfs_handle_struct *handle, const char *path)
{
        int result;
        
        result = SMB_VFS_NEXT_RMDIR(handle, path);

        syslog(audit_syslog_priority(handle), "rmdir %s %s%s\n", 
               path, 
               (result < 0) ? "failed: " : "",
               (result < 0) ? strerror(errno) : "");
        DEBUG(0, ("vfs_extd_audit: rmdir %s %s %s\n",
               path,
               (result < 0) ? "failed: " : "",
               (result < 0) ? strerror(errno) : ""));

        return result;
}

static int audit_open(vfs_handle_struct *handle, const char *fname, files_struct *fsp, int flags, mode_t mode)
{
        int result;
        
        result = SMB_VFS_NEXT_OPEN(handle, fname, fsp, flags, mode);

        syslog(audit_syslog_priority(handle), "open %s (fd %d) %s%s%s\n", 
               fname, result,
               ((flags & O_WRONLY) || (flags & O_RDWR)) ? "for writing " : "", 
               (result < 0) ? "failed: " : "",
               (result < 0) ? strerror(errno) : "");
        DEBUG(2, ("vfs_extd_audit: open %s %s %s\n",
               fname,
               (result < 0) ? "failed: " : "",
               (result < 0) ? strerror(errno) : ""));

        return result;
}

static int audit_close(vfs_handle_struct *handle, files_struct *fsp, int fd)
{
        int result;
        
        result = SMB_VFS_NEXT_CLOSE(handle, fsp, fd);

        syslog(audit_syslog_priority(handle), "close fd %d %s%s\n",
               fd,
               (result < 0) ? "failed: " : "",
               (result < 0) ? strerror(errno) : "");
        DEBUG(2, ("vfs_extd_audit: close fd %d %s %s\n",
               fd,
               (result < 0) ? "failed: " : "",
               (result < 0) ? strerror(errno) : ""));

        return result;
}

static int audit_rename(vfs_handle_struct *handle, const char *oldname, const char *newname)
{
        int result;
        
        result = SMB_VFS_NEXT_RENAME(handle, oldname, newname);

        syslog(audit_syslog_priority(handle), "rename %s -> %s %s%s\n",
               oldname, newname,
               (result < 0) ? "failed: " : "",
               (result < 0) ? strerror(errno) : "");
        DEBUG(1, ("vfs_extd_audit: rename old: %s newname: %s  %s %s\n",
               oldname, newname,
               (result < 0) ? "failed: " : "",
               (result < 0) ? strerror(errno) : ""));

        return result;    
}

static int audit_unlink(vfs_handle_struct *handle, const char *path)
{
        int result;
        
        result = SMB_VFS_NEXT_UNLINK(handle, path);

        syslog(audit_syslog_priority(handle), "unlink %s %s%s\n",
               path,
               (result < 0) ? "failed: " : "",
               (result < 0) ? strerror(errno) : "");
        DEBUG(0, ("vfs_extd_audit: unlink %s %s %s\n",
               path,
               (result < 0) ? "failed: " : "",
               (result < 0) ? strerror(errno) : ""));

        return result;
}

static int audit_chmod(vfs_handle_struct *handle, const char *path, mode_t mode)
{
        int result;

        result = SMB_VFS_NEXT_CHMOD(handle, path, mode);

        syslog(audit_syslog_priority(handle), "chmod %s mode 0x%x %s%s\n",
               path, mode,
               (result < 0) ? "failed: " : "",
               (result < 0) ? strerror(errno) : "");
        DEBUG(1, ("vfs_extd_audit: chmod %s mode 0x%x %s %s\n",
               path, mode,
               (result < 0) ? "failed: " : "",
               (result < 0) ? strerror(errno) : ""));

        return result;
}

static int audit_chmod_acl(vfs_handle_struct *handle, const char *path, mode_t mode)
{
        int result;
        
        result = SMB_VFS_NEXT_CHMOD_ACL(handle, path, mode);

        syslog(audit_syslog_priority(handle), "chmod_acl %s mode 0x%x %s%s\n",
               path, mode,
               (result < 0) ? "failed: " : "",
               (result < 0) ? strerror(errno) : "");
        DEBUG(1, ("vfs_extd_audit: chmod_acl %s mode 0x%x %s %s\n",
                path, mode,
               (result < 0) ? "failed: " : "",
               (result < 0) ? strerror(errno) : ""));

        return result;
}

static int audit_fchmod(vfs_handle_struct *handle, files_struct *fsp, int fd, mode_t mode)
{
        int result;
        
        result = SMB_VFS_NEXT_FCHMOD(handle, fsp, fd, mode);

        syslog(audit_syslog_priority(handle), "fchmod %s mode 0x%x %s%s\n",
               fsp->fsp_name, mode,
               (result < 0) ? "failed: " : "",
               (result < 0) ? strerror(errno) : "");
        DEBUG(1, ("vfs_extd_audit: fchmod %s mode 0x%x %s %s",
               fsp->fsp_name,  mode,
               (result < 0) ? "failed: " : "",
               (result < 0) ? strerror(errno) : ""));

        return result;
}

static int audit_fchmod_acl(vfs_handle_struct *handle, files_struct *fsp, int fd, mode_t mode)
{
        int result;
        
        result = SMB_VFS_NEXT_FCHMOD_ACL(handle, fsp, fd, mode);

        syslog(audit_syslog_priority(handle), "fchmod_acl %s mode 0x%x %s%s\n",
               fsp->fsp_name, mode,
               (result < 0) ? "failed: " : "",
               (result < 0) ? strerror(errno) : "");
        DEBUG(1, ("vfs_extd_audit: fchmod_acl %s mode 0x%x %s %s",
               fsp->fsp_name,  mode,
               (result < 0) ? "failed: " : "",
               (result < 0) ? strerror(errno) : ""));

        return result;
}

NTSTATUS vfs_extd_audit_init(void);
NTSTATUS vfs_extd_audit_init(void)
{
        NTSTATUS ret = smb_register_vfs(SMB_VFS_INTERFACE_VERSION, "extd_audit", audit_op_tuples);
        
        if (!NT_STATUS_IS_OK(ret))
                return ret;

        vfs_extd_audit_debug_level = debug_add_class("extd_audit");
        if (vfs_extd_audit_debug_level == -1) {
                vfs_extd_audit_debug_level = DBGC_VFS;
                DEBUG(0, ("vfs_extd_audit: Couldn't register custom debugging class!\n"));
        } else {
                DEBUG(10, ("vfs_extd_audit: Debug class number of 'extd_audit': %d\n", vfs_extd_audit_debug_level));
        }
        
        return ret;
}

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