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postlogin.c
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postlogin.c
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/*
* Part of Very Secure FTPd
* Licence: GPL v2
* Author: Chris Evans
* postlogin.c
*/
#include "postlogin.h"
#include "session.h"
#include "oneprocess.h"
#include "twoprocess.h"
#include "ftpcodes.h"
#include "ftpcmdio.h"
#include "ftpdataio.h"
#include "utility.h"
#include "tunables.h"
#include "defs.h"
#include "str.h"
#include "sysstr.h"
#include "banner.h"
#include "sysutil.h"
#include "logging.h"
#include "sysdeputil.h"
#include "ipaddrparse.h"
#include "access.h"
#include "features.h"
#include "ssl.h"
#include "vsftpver.h"
#include "opts.h"
#pragma CHECKED_SCOPE on
/* Private local functions */
static void handle_pwd(struct vsf_session *p_sess : itype(_Ptr<struct vsf_session>));
static void handle_cwd(struct vsf_session *p_sess : itype(_Ptr<struct vsf_session>));
static void handle_pasv(struct vsf_session *p_sess : itype(_Ptr<struct vsf_session>), int is_epsv);
static void handle_retr(struct vsf_session *p_sess : itype(_Ptr<struct vsf_session>), int is_http);
static void handle_cdup(struct vsf_session *p_sess : itype(_Ptr<struct vsf_session>));
static void handle_list(struct vsf_session *p_sess : itype(_Ptr<struct vsf_session>));
static void handle_type(struct vsf_session *p_sess : itype(_Ptr<struct vsf_session>));
static void handle_port(struct vsf_session *p_sess : itype(_Ptr<struct vsf_session>));
static void handle_stor(struct vsf_session *p_sess : itype(_Ptr<struct vsf_session>));
static void handle_mkd(struct vsf_session *p_sess : itype(_Ptr<struct vsf_session>));
static void handle_rmd(struct vsf_session *p_sess : itype(_Ptr<struct vsf_session>));
static void handle_dele(struct vsf_session *p_sess : itype(_Ptr<struct vsf_session>));
static void handle_rest(struct vsf_session *p_sess : itype(_Ptr<struct vsf_session>));
static void handle_rnfr(struct vsf_session *p_sess : itype(_Ptr<struct vsf_session>));
static void handle_rnto(struct vsf_session *p_sess : itype(_Ptr<struct vsf_session>));
static void handle_nlst(struct vsf_session *p_sess : itype(_Ptr<struct vsf_session>));
static void handle_size(struct vsf_session *p_sess : itype(_Ptr<struct vsf_session>));
static void handle_site(struct vsf_session *p_sess : itype(_Ptr<struct vsf_session>));
static void handle_appe(struct vsf_session *p_sess : itype(_Ptr<struct vsf_session>));
static void handle_mdtm(struct vsf_session *p_sess : itype(_Ptr<struct vsf_session>));
static void handle_site_chmod(struct vsf_session *p_sess : itype(_Ptr<struct vsf_session>), struct mystr *p_arg_str : itype(_Ptr<struct mystr>));
static void handle_site_umask(struct vsf_session *p_sess : itype(_Ptr<struct vsf_session>), struct mystr *p_arg_str : itype(_Ptr<struct mystr>));
static void handle_eprt(struct vsf_session *p_sess : itype(_Ptr<struct vsf_session>));
static void handle_help(struct vsf_session *p_sess : itype(_Ptr<struct vsf_session>));
static void handle_stou(struct vsf_session *p_sess : itype(_Ptr<struct vsf_session>));
static void handle_stat(struct vsf_session *p_sess : itype(_Ptr<struct vsf_session>));
static void handle_stat_file(struct vsf_session *p_sess : itype(_Ptr<struct vsf_session>));
static void handle_logged_in_user(struct vsf_session *p_sess : itype(_Ptr<struct vsf_session>));
static void handle_logged_in_pass(struct vsf_session *p_sess : itype(_Ptr<struct vsf_session>));
static void handle_http(struct vsf_session *p_sess : itype(_Ptr<struct vsf_session>));
static int pasv_active(struct vsf_session *p_sess : itype(_Ptr<struct vsf_session>));
static int port_active(struct vsf_session *p_sess : itype(_Ptr<struct vsf_session>));
static void pasv_cleanup(struct vsf_session *p_sess : itype(_Ptr<struct vsf_session>));
static void port_cleanup(struct vsf_session *p_sess : itype(_Ptr<struct vsf_session>));
static void handle_dir_common(struct vsf_session *p_sess : itype(_Ptr<struct vsf_session>), int full_details, int stat_cmd);
static void prepend_path_to_filename(struct mystr *p_str : itype(_Ptr<struct mystr>));
static int get_remote_transfer_fd(struct vsf_session *p_sess : itype(_Ptr<struct vsf_session>), const char *p_status_msg : itype(_Nt_array_ptr<const char>));
static void check_abor(struct vsf_session *p_sess : itype(_Ptr<struct vsf_session>));
static void handle_sigurg(_Ptr<void> p_private);
static void handle_upload_common(struct vsf_session *p_sess : itype(_Ptr<struct vsf_session>), int is_append, int is_unique);
static void get_unique_filename(struct mystr *p_outstr : itype(_Ptr<struct mystr>), const struct mystr *p_base : itype(_Ptr<const struct mystr>));
static int data_transfer_checks_ok(struct vsf_session *p_sess : itype(_Ptr<struct vsf_session>));
static void resolve_tilde(struct mystr *p_str : itype(_Ptr<struct mystr>), struct vsf_session *p_sess : itype(_Ptr<struct vsf_session>));
void
process_post_login(struct vsf_session* p_sess : itype(_Ptr<struct vsf_session>))
{
str_getcwd(&p_sess->home_str);
if (p_sess->is_anonymous)
{
vsf_sysutil_set_umask(tunable_anon_umask);
p_sess->bw_rate_max = tunable_anon_max_rate;
}
else
{
vsf_sysutil_set_umask(tunable_local_umask);
p_sess->bw_rate_max = tunable_local_max_rate;
}
if (p_sess->is_http)
{
handle_http(p_sess);
bug("should not be reached");
}
/* Don't support async ABOR if we have an SSL channel. The spec says SHOULD
* NOT, and I think there are synchronization issues between command and
* data reads.
*/
if (tunable_async_abor_enable && !p_sess->control_use_ssl)
{
vsf_sysutil_install_sighandler(kVSFSysUtilSigURG, handle_sigurg, (_Ptr<void>) p_sess, 0);
vsf_sysutil_activate_sigurg(VSFTP_COMMAND_FD);
}
/* Handle any login message */
vsf_banner_dir_changed(p_sess, FTP_LOGINOK);
vsf_cmdio_write(p_sess, FTP_LOGINOK, "Login successful.");
while(1)
{
int cmd_ok = 1;
if (tunable_setproctitle_enable)
{
vsf_sysutil_setproctitle("IDLE");
}
/* Blocks */
vsf_cmdio_get_cmd_and_arg(p_sess, &p_sess->ftp_cmd_str,
&p_sess->ftp_arg_str, 1);
if (tunable_setproctitle_enable)
{
struct mystr proctitle_str = INIT_MYSTR;
str_copy(&proctitle_str, &p_sess->ftp_cmd_str);
if (!str_isempty(&p_sess->ftp_arg_str))
{
str_append_char(&proctitle_str, ' ');
str_append_str(&proctitle_str, &p_sess->ftp_arg_str);
}
/* Suggestion from Solar */
str_replace_unprintable(&proctitle_str, '?');
vsf_sysutil_setproctitle_str(&proctitle_str);
str_free(&proctitle_str);
}
/* Test command against the allowed lists.. */
if (tunable_cmds_allowed)
{
static struct mystr s_src_str = {};
static struct mystr s_rhs_str = {};
str_alloc_text(&s_src_str, tunable_cmds_allowed);
while (1)
{
str_split_char(&s_src_str, &s_rhs_str, ',');
if (str_isempty(&s_src_str))
{
cmd_ok = 0;
break;
}
else if (str_equal(&s_src_str, &p_sess->ftp_cmd_str))
{
break;
}
str_copy(&s_src_str, &s_rhs_str);
}
}
if (tunable_cmds_denied)
{
static struct mystr s_src_str = {};
static struct mystr s_rhs_str = {};
str_alloc_text(&s_src_str, tunable_cmds_denied);
while (1)
{
str_split_char(&s_src_str, &s_rhs_str, ',');
if (str_isempty(&s_src_str))
{
break;
}
else if (str_equal(&s_src_str, &p_sess->ftp_cmd_str))
{
cmd_ok = 0;
break;
}
str_copy(&s_src_str, &s_rhs_str);
}
}
if (!cmd_ok)
{
vsf_cmdio_write(p_sess, FTP_NOPERM, "Permission denied.");
}
else if (str_equal_text(&p_sess->ftp_cmd_str, "QUIT"))
{
vsf_cmdio_write_exit(p_sess, FTP_GOODBYE, "Goodbye.", 0);
}
else if (str_equal_text(&p_sess->ftp_cmd_str, "PWD") ||
str_equal_text(&p_sess->ftp_cmd_str, "XPWD"))
{
handle_pwd(p_sess);
}
else if (str_equal_text(&p_sess->ftp_cmd_str, "CWD") ||
str_equal_text(&p_sess->ftp_cmd_str, "XCWD"))
{
handle_cwd(p_sess);
}
else if (str_equal_text(&p_sess->ftp_cmd_str, "CDUP") ||
str_equal_text(&p_sess->ftp_cmd_str, "XCUP"))
{
handle_cdup(p_sess);
}
else if (tunable_pasv_enable &&
!p_sess->epsv_all &&
(str_equal_text(&p_sess->ftp_cmd_str, "PASV") ||
str_equal_text(&p_sess->ftp_cmd_str, "P@SW")))
{
handle_pasv(p_sess, 0);
}
else if (tunable_pasv_enable &&
str_equal_text(&p_sess->ftp_cmd_str, "EPSV"))
{
handle_pasv(p_sess, 1);
}
else if (tunable_download_enable &&
str_equal_text(&p_sess->ftp_cmd_str, "RETR"))
{
handle_retr(p_sess, 0);
}
else if (str_equal_text(&p_sess->ftp_cmd_str, "NOOP"))
{
vsf_cmdio_write(p_sess, FTP_NOOPOK, "NOOP ok.");
}
else if (str_equal_text(&p_sess->ftp_cmd_str, "SYST"))
{
vsf_cmdio_write(p_sess, FTP_SYSTOK, "UNIX Type: L8");
}
else if (str_equal_text(&p_sess->ftp_cmd_str, "HELP"))
{
handle_help(p_sess);
}
else if (tunable_dirlist_enable &&
str_equal_text(&p_sess->ftp_cmd_str, "LIST"))
{
handle_list(p_sess);
}
else if (str_equal_text(&p_sess->ftp_cmd_str, "TYPE"))
{
handle_type(p_sess);
}
else if (tunable_port_enable &&
!p_sess->epsv_all &&
str_equal_text(&p_sess->ftp_cmd_str, "PORT"))
{
handle_port(p_sess);
}
else if (tunable_write_enable &&
(tunable_anon_upload_enable || !p_sess->is_anonymous) &&
str_equal_text(&p_sess->ftp_cmd_str, "STOR"))
{
handle_stor(p_sess);
}
else if (tunable_write_enable &&
(tunable_anon_mkdir_write_enable || !p_sess->is_anonymous) &&
(str_equal_text(&p_sess->ftp_cmd_str, "MKD") ||
str_equal_text(&p_sess->ftp_cmd_str, "XMKD")))
{
handle_mkd(p_sess);
}
else if (tunable_write_enable &&
(tunable_anon_other_write_enable || !p_sess->is_anonymous) &&
(str_equal_text(&p_sess->ftp_cmd_str, "RMD") ||
str_equal_text(&p_sess->ftp_cmd_str, "XRMD")))
{
handle_rmd(p_sess);
}
else if (tunable_write_enable &&
(tunable_anon_other_write_enable || !p_sess->is_anonymous) &&
str_equal_text(&p_sess->ftp_cmd_str, "DELE"))
{
handle_dele(p_sess);
}
else if (str_equal_text(&p_sess->ftp_cmd_str, "REST"))
{
handle_rest(p_sess);
}
else if (tunable_write_enable &&
(tunable_anon_other_write_enable || !p_sess->is_anonymous) &&
str_equal_text(&p_sess->ftp_cmd_str, "RNFR"))
{
handle_rnfr(p_sess);
}
else if (tunable_write_enable &&
(tunable_anon_other_write_enable || !p_sess->is_anonymous) &&
str_equal_text(&p_sess->ftp_cmd_str, "RNTO"))
{
handle_rnto(p_sess);
}
else if (tunable_dirlist_enable &&
str_equal_text(&p_sess->ftp_cmd_str, "NLST"))
{
handle_nlst(p_sess);
}
else if (str_equal_text(&p_sess->ftp_cmd_str, "SIZE"))
{
handle_size(p_sess);
}
else if (!p_sess->is_anonymous &&
str_equal_text(&p_sess->ftp_cmd_str, "SITE"))
{
handle_site(p_sess);
}
/* Note - the weird ABOR string is checking for an async ABOR arriving
* without a SIGURG condition.
*/
else if (str_equal_text(&p_sess->ftp_cmd_str, "ABOR") ||
str_equal_text(&p_sess->ftp_cmd_str, "\377\364\377\362ABOR"))
{
vsf_cmdio_write(p_sess, FTP_ABOR_NOCONN, "No transfer to ABOR.");
}
else if (tunable_write_enable &&
(tunable_anon_other_write_enable || !p_sess->is_anonymous) &&
str_equal_text(&p_sess->ftp_cmd_str, "APPE"))
{
handle_appe(p_sess);
}
else if (str_equal_text(&p_sess->ftp_cmd_str, "MDTM"))
{
handle_mdtm(p_sess);
}
else if (tunable_port_enable &&
str_equal_text(&p_sess->ftp_cmd_str, "EPRT"))
{
handle_eprt(p_sess);
}
else if (str_equal_text(&p_sess->ftp_cmd_str, "STRU"))
{
str_upper(&p_sess->ftp_arg_str);
if (str_equal_text(&p_sess->ftp_arg_str, "F"))
{
vsf_cmdio_write(p_sess, FTP_STRUOK, "Structure set to F.");
}
else
{
vsf_cmdio_write(p_sess, FTP_BADSTRU, "Bad STRU command.");
}
}
else if (str_equal_text(&p_sess->ftp_cmd_str, "MODE"))
{
str_upper(&p_sess->ftp_arg_str);
if (str_equal_text(&p_sess->ftp_arg_str, "S"))
{
vsf_cmdio_write(p_sess, FTP_MODEOK, "Mode set to S.");
}
else
{
vsf_cmdio_write(p_sess, FTP_BADMODE, "Bad MODE command.");
}
}
else if (tunable_write_enable &&
(tunable_anon_upload_enable || !p_sess->is_anonymous) &&
str_equal_text(&p_sess->ftp_cmd_str, "STOU"))
{
handle_stou(p_sess);
}
else if (str_equal_text(&p_sess->ftp_cmd_str, "ALLO"))
{
vsf_cmdio_write(p_sess, FTP_ALLOOK, "ALLO command ignored.");
}
else if (str_equal_text(&p_sess->ftp_cmd_str, "REIN"))
{
vsf_cmdio_write(p_sess, FTP_COMMANDNOTIMPL, "REIN not implemented.");
}
else if (str_equal_text(&p_sess->ftp_cmd_str, "ACCT"))
{
vsf_cmdio_write(p_sess, FTP_COMMANDNOTIMPL, "ACCT not implemented.");
}
else if (str_equal_text(&p_sess->ftp_cmd_str, "SMNT"))
{
vsf_cmdio_write(p_sess, FTP_COMMANDNOTIMPL, "SMNT not implemented.");
}
else if (str_equal_text(&p_sess->ftp_cmd_str, "FEAT"))
{
handle_feat(p_sess);
}
else if (str_equal_text(&p_sess->ftp_cmd_str, "OPTS"))
{
handle_opts(p_sess);
}
else if (str_equal_text(&p_sess->ftp_cmd_str, "STAT") &&
str_isempty(&p_sess->ftp_arg_str))
{
handle_stat(p_sess);
}
else if (tunable_dirlist_enable &&
str_equal_text(&p_sess->ftp_cmd_str, "STAT"))
{
handle_stat_file(p_sess);
}
else if (tunable_ssl_enable && str_equal_text(&p_sess->ftp_cmd_str, "PBSZ"))
{
handle_pbsz(p_sess);
}
else if (tunable_ssl_enable && str_equal_text(&p_sess->ftp_cmd_str, "PROT"))
{
handle_prot(p_sess);
}
else if (str_equal_text(&p_sess->ftp_cmd_str, "USER"))
{
handle_logged_in_user(p_sess);
}
else if (str_equal_text(&p_sess->ftp_cmd_str, "PASS"))
{
handle_logged_in_pass(p_sess);
}
else if (str_equal_text(&p_sess->ftp_cmd_str, "PASV") ||
str_equal_text(&p_sess->ftp_cmd_str, "PORT") ||
str_equal_text(&p_sess->ftp_cmd_str, "STOR") ||
str_equal_text(&p_sess->ftp_cmd_str, "MKD") ||
str_equal_text(&p_sess->ftp_cmd_str, "XMKD") ||
str_equal_text(&p_sess->ftp_cmd_str, "RMD") ||
str_equal_text(&p_sess->ftp_cmd_str, "XRMD") ||
str_equal_text(&p_sess->ftp_cmd_str, "DELE") ||
str_equal_text(&p_sess->ftp_cmd_str, "RNFR") ||
str_equal_text(&p_sess->ftp_cmd_str, "RNTO") ||
str_equal_text(&p_sess->ftp_cmd_str, "SITE") ||
str_equal_text(&p_sess->ftp_cmd_str, "APPE") ||
str_equal_text(&p_sess->ftp_cmd_str, "EPSV") ||
str_equal_text(&p_sess->ftp_cmd_str, "EPRT") ||
str_equal_text(&p_sess->ftp_cmd_str, "RETR") ||
str_equal_text(&p_sess->ftp_cmd_str, "LIST") ||
str_equal_text(&p_sess->ftp_cmd_str, "NLST") ||
str_equal_text(&p_sess->ftp_cmd_str, "STOU") ||
str_equal_text(&p_sess->ftp_cmd_str, "ALLO") ||
str_equal_text(&p_sess->ftp_cmd_str, "REIN") ||
str_equal_text(&p_sess->ftp_cmd_str, "ACCT") ||
str_equal_text(&p_sess->ftp_cmd_str, "SMNT") ||
str_equal_text(&p_sess->ftp_cmd_str, "FEAT") ||
str_equal_text(&p_sess->ftp_cmd_str, "OPTS") ||
str_equal_text(&p_sess->ftp_cmd_str, "STAT") ||
str_equal_text(&p_sess->ftp_cmd_str, "PBSZ") ||
str_equal_text(&p_sess->ftp_cmd_str, "PROT"))
{
vsf_cmdio_write(p_sess, FTP_NOPERM, "Permission denied.");
}
else if (str_isempty(&p_sess->ftp_cmd_str) &&
str_isempty(&p_sess->ftp_arg_str))
{
/* Deliberately ignore to avoid NAT device bugs. ProFTPd does the same. */
}
else if (str_equal_text(&p_sess->ftp_cmd_str, "GET") ||
str_equal_text(&p_sess->ftp_cmd_str, "POST") ||
str_equal_text(&p_sess->ftp_cmd_str, "HEAD") ||
str_equal_text(&p_sess->ftp_cmd_str, "OPTIONS") ||
str_equal_text(&p_sess->ftp_cmd_str, "CONNECT"))
{
vsf_cmdio_write_exit(p_sess, FTP_BADCMD,
"HTTP protocol commands not allowed.", 1);
}
else
{
vsf_cmdio_write(p_sess, FTP_BADCMD, "Unknown command.");
}
if (vsf_log_entry_pending(p_sess))
{
vsf_log_do_log(p_sess, 0);
}
if (p_sess->data_timeout)
{
vsf_cmdio_write_exit(p_sess, FTP_DATA_TIMEOUT,
"Data timeout. Reconnect. Sorry.", 1);
}
}
}
static void
handle_pwd(struct vsf_session *p_sess : itype(_Ptr<struct vsf_session>))
{
static struct mystr s_cwd_buf_mangle_str = {};
static struct mystr s_pwd_res_str = {};
str_getcwd(&s_cwd_buf_mangle_str);
/* Double up any double-quotes in the pathname! */
str_replace_text(&s_cwd_buf_mangle_str, "\"", "\"\"");
/* Enclose pathname in quotes */
str_alloc_text(&s_pwd_res_str, "\"");
str_append_str(&s_pwd_res_str, &s_cwd_buf_mangle_str);
str_append_text(&s_pwd_res_str, "\" is the current directory");
vsf_cmdio_write_str(p_sess, FTP_PWDOK, &s_pwd_res_str);
}
static void
handle_cwd(struct vsf_session *p_sess : itype(_Ptr<struct vsf_session>))
{
int retval;
resolve_tilde(&p_sess->ftp_arg_str, p_sess);
if (!vsf_access_check_file(&p_sess->ftp_arg_str))
{
vsf_cmdio_write(p_sess, FTP_NOPERM, "Permission denied.");
return;
}
retval = str_chdir(&p_sess->ftp_arg_str);
if (retval == 0)
{
/* Handle any messages */
vsf_banner_dir_changed(p_sess, FTP_CWDOK);
vsf_cmdio_write(p_sess, FTP_CWDOK, "Directory successfully changed.");
}
else
{
vsf_cmdio_write(p_sess, FTP_FILEFAIL, "Failed to change directory.");
}
}
static void
handle_cdup(struct vsf_session *p_sess : itype(_Ptr<struct vsf_session>))
{
str_alloc_text(&p_sess->ftp_arg_str, "..");
handle_cwd(p_sess);
}
static int
port_active(struct vsf_session *p_sess : itype(_Ptr<struct vsf_session>))
{
int ret = 0;
if (p_sess->p_port_sockaddr != 0)
{
ret = 1;
if (pasv_active(p_sess))
{
bug("port and pasv both active");
}
}
return ret;
}
static int
pasv_active(struct vsf_session *p_sess : itype(_Ptr<struct vsf_session>))
{
int ret = 0;
if (tunable_one_process_model)
{
ret = vsf_one_process_pasv_active(p_sess);
}
else
{
ret = vsf_two_process_pasv_active(p_sess);
}
if (ret)
{
if (port_active(p_sess))
{
bug("pasv and port both active");
}
}
return ret;
}
static void
port_cleanup(struct vsf_session *p_sess : itype(_Ptr<struct vsf_session>))
{
vsf_sysutil_sockaddr_clear(&p_sess->p_port_sockaddr);
}
static void
pasv_cleanup(struct vsf_session *p_sess : itype(_Ptr<struct vsf_session>))
{
if (tunable_one_process_model)
{
vsf_one_process_pasv_cleanup(p_sess);
}
else
{
vsf_two_process_pasv_cleanup(p_sess);
}
}
static void
handle_pasv(struct vsf_session *p_sess : itype(_Ptr<struct vsf_session>), int is_epsv)
{
unsigned short the_port;
static struct mystr s_pasv_res_str = {};
static _Ptr<struct vsf_sysutil_sockaddr> s_p_sockaddr = 0;
int is_ipv6 = vsf_sysutil_sockaddr_is_ipv6(p_sess->p_local_addr);
if (is_epsv && !str_isempty(&p_sess->ftp_arg_str))
{
int argval;
str_upper(&p_sess->ftp_arg_str);
if (str_equal_text(&p_sess->ftp_arg_str, "ALL"))
{
p_sess->epsv_all = 1;
vsf_cmdio_write(p_sess, FTP_EPSVALLOK, "EPSV ALL ok.");
return;
}
argval = vsf_sysutil_atoi(str_getbuf(&p_sess->ftp_arg_str));
if (argval < 1 || argval > 2 || (!is_ipv6 && argval == 2))
{
vsf_cmdio_write(p_sess, FTP_EPSVBAD, "Bad network protocol.");
return;
}
}
pasv_cleanup(p_sess);
port_cleanup(p_sess);
if (tunable_one_process_model)
{
the_port = vsf_one_process_listen(p_sess);
}
else
{
the_port = vsf_two_process_listen(p_sess);
}
if (is_epsv)
{
str_alloc_text(&s_pasv_res_str, "Entering Extended Passive Mode (|||");
str_append_ulong(&s_pasv_res_str, (unsigned long) the_port);
str_append_text(&s_pasv_res_str, "|)");
vsf_cmdio_write_str(p_sess, FTP_EPSVOK, &s_pasv_res_str);
return;
}
if (tunable_pasv_address != 0)
{
vsf_sysutil_sockaddr_alloc_ipv4(&s_p_sockaddr);
/* Report passive address as specified in configuration */
if (vsf_sysutil_inet_aton(tunable_pasv_address, s_p_sockaddr) == 0)
{
die("invalid pasv_address");
}
}
else
{
vsf_sysutil_sockaddr_clone(&s_p_sockaddr, p_sess->p_local_addr);
}
str_alloc_text(&s_pasv_res_str, "Entering Passive Mode (");
if (!is_ipv6)
{
str_append_text(&s_pasv_res_str, vsf_sysutil_inet_ntop(s_p_sockaddr));
}
else
{
_Array_ptr<const void> p_v4addr : byte_count(4) = vsf_sysutil_sockaddr_ipv6_v4(s_p_sockaddr);
if (p_v4addr)
{
str_append_text(&s_pasv_res_str, vsf_sysutil_inet_ntoa(p_v4addr));
}
else
{
str_append_text(&s_pasv_res_str, "0,0,0,0");
}
}
str_replace_char(&s_pasv_res_str, '.', ',');
str_append_text(&s_pasv_res_str, ",");
str_append_ulong(&s_pasv_res_str, the_port >> 8);
str_append_text(&s_pasv_res_str, ",");
str_append_ulong(&s_pasv_res_str, the_port & 255);
str_append_text(&s_pasv_res_str, ").");
vsf_cmdio_write_str(p_sess, FTP_PASVOK, &s_pasv_res_str);
}
static void
handle_retr(struct vsf_session *p_sess : itype(_Ptr<struct vsf_session>), int is_http)
{
static struct mystr s_mark_str = {};
static _Ptr<struct vsf_sysutil_statbuf> s_p_statbuf = ((void *)0);
struct vsf_transfer_ret trans_ret;
int remote_fd;
int opened_file;
int is_ascii = 0;
filesize_t offset = p_sess->restart_pos;
p_sess->restart_pos = 0;
if (!is_http && !data_transfer_checks_ok(p_sess))
{
return;
}
if (p_sess->is_ascii && offset != 0)
{
vsf_cmdio_write(p_sess, FTP_FILEFAIL,
"No support for resume of ASCII transfer.");
return;
}
resolve_tilde(&p_sess->ftp_arg_str, p_sess);
vsf_log_start_entry(p_sess, kVSFLogEntryDownload);
str_copy(&p_sess->log_str, &p_sess->ftp_arg_str);
prepend_path_to_filename(&p_sess->log_str);
if (!vsf_access_check_file(&p_sess->ftp_arg_str) ||
!vsf_access_check_file_download(&p_sess->ftp_arg_str))
{
vsf_cmdio_write(p_sess, FTP_NOPERM, "Permission denied.");
return;
}
opened_file = str_open(&p_sess->ftp_arg_str, kVSFSysStrOpenReadOnly);
if (vsf_sysutil_retval_is_error(opened_file))
{
vsf_cmdio_write(p_sess, FTP_FILEFAIL, "Failed to open file.");
return;
}
/* Lock file if required */
if (tunable_lock_upload_files)
{
vsf_sysutil_lock_file_read(opened_file);
}
vsf_sysutil_fstat(opened_file, &s_p_statbuf);
/* No games please */
if (!vsf_sysutil_statbuf_is_regfile(s_p_statbuf))
{
/* Note - pretend open failed */
vsf_cmdio_write(p_sess, FTP_FILEFAIL, "Failed to open file.");
/* Irritating FireFox does RETR on directories, so avoid logging this
* very common and noisy case.
*/
if (vsf_sysutil_statbuf_is_dir(s_p_statbuf))
{
vsf_log_clear_entry(p_sess);
}
goto file_close_out;
}
/* Now deactive O_NONBLOCK, otherwise we have a problem on DMAPI filesystems
* such as XFS DMAPI.
*/
vsf_sysutil_deactivate_noblock(opened_file);
/* Optionally, we'll be paranoid and only serve publicly readable stuff */
if (p_sess->is_anonymous && tunable_anon_world_readable_only &&
!vsf_sysutil_statbuf_is_readable_other(s_p_statbuf))
{
vsf_cmdio_write(p_sess, FTP_FILEFAIL, "Failed to open file.");
goto file_close_out;
}
/* Set the download offset (from REST) if any */
if (offset != 0)
{
vsf_sysutil_lseek_to(opened_file, offset);
}
str_alloc_text(&s_mark_str, "Opening ");
if (tunable_ascii_download_enable && p_sess->is_ascii)
{
str_append_text(&s_mark_str, "ASCII");
is_ascii = 1;
}
else
{
str_append_text(&s_mark_str, "BINARY");
}
str_append_text(&s_mark_str, " mode data connection for ");
str_append_str(&s_mark_str, &p_sess->ftp_arg_str);
str_append_text(&s_mark_str, " (");
str_append_filesize_t(&s_mark_str,
vsf_sysutil_statbuf_get_size(s_p_statbuf));
str_append_text(&s_mark_str, " bytes).");
if (is_http)
{
remote_fd = VSFTP_COMMAND_FD;
}
else
{
remote_fd = get_remote_transfer_fd(p_sess, str_getbuf(&s_mark_str));
if (vsf_sysutil_retval_is_error(remote_fd))
{
goto port_pasv_cleanup_out;
}
}
trans_ret = vsf_ftpdataio_transfer_file(p_sess, remote_fd,
opened_file, 0, is_ascii);
if (!is_http &&
vsf_ftpdataio_dispose_transfer_fd(p_sess) != 1 &&
trans_ret.retval == 0)
{
trans_ret.retval = -2;
}
p_sess->transfer_size = trans_ret.transferred;
/* Log _after_ the blocking dispose call, so we get transfer times right */
if (trans_ret.retval == 0)
{
vsf_log_do_log(p_sess, 1);
}
if (is_http)
{
goto file_close_out;
}
/* Emit status message _after_ blocking dispose call to avoid buggy FTP
* clients truncating the transfer.
*/
if (trans_ret.retval == -1)
{
vsf_cmdio_write(p_sess, FTP_BADSENDFILE, "Failure reading local file.");
}
else if (trans_ret.retval == -2)
{
if (!p_sess->data_timeout)
{
vsf_cmdio_write(p_sess, FTP_BADSENDNET,
"Failure writing network stream.");
}
}
else
{
vsf_cmdio_write(p_sess, FTP_TRANSFEROK, "Transfer complete.");
}
check_abor(p_sess);
port_pasv_cleanup_out:
port_cleanup(p_sess);
pasv_cleanup(p_sess);
file_close_out:
vsf_sysutil_close(opened_file);
}
static void
handle_list(struct vsf_session *p_sess : itype(_Ptr<struct vsf_session>))
{
handle_dir_common(p_sess, 1, 0);
}
static void
handle_dir_common(struct vsf_session *p_sess : itype(_Ptr<struct vsf_session>), int full_details, int stat_cmd)
{
static struct mystr s_option_str = {};
static struct mystr s_filter_str = {};
static struct mystr s_dir_name_str = {};
static _Ptr<struct vsf_sysutil_statbuf> s_p_dirstat = ((void *)0);
int dir_allow_read = 1;
_Ptr<struct vsf_sysutil_dir> p_dir = 0;
int retval = 0;
int use_control = 0;
str_empty(&s_option_str);
str_empty(&s_filter_str);
/* By default open the current directory */
str_alloc_text(&s_dir_name_str, ".");
if (!stat_cmd && !data_transfer_checks_ok(p_sess))
{
return;
}
/* Do we have an option? Going to be strict here - the option must come
* first. e.g. "ls -a .." fine, "ls .. -a" not fine
*/
if (!str_isempty(&p_sess->ftp_arg_str) &&
str_get_char_at(&p_sess->ftp_arg_str, 0) == '-')
{
/* Chop off the '-' */
str_mid_to_end(&p_sess->ftp_arg_str, &s_option_str, 1);
/* A space will separate options from filter (if any) */
str_split_char(&s_option_str, &s_filter_str, ' ');
}
else
{
/* The argument, if any, is just a filter */
str_copy(&s_filter_str, &p_sess->ftp_arg_str);
}
if (!str_isempty(&s_filter_str))
{
resolve_tilde(&s_filter_str, p_sess);
if (!vsf_access_check_file(&s_filter_str))
{
vsf_cmdio_write(p_sess, FTP_NOPERM, "Permission denied.");
return;
}
/* First check - is it an outright directory, as in "ls /pub" */
p_dir = str_opendir(&s_filter_str);
if (p_dir != 0)
{
/* Listing a directory! */
str_copy(&s_dir_name_str, &s_filter_str);
str_free(&s_filter_str);
}
else
{
struct str_locate_result locate_result =
str_locate_char(&s_filter_str, '/');
if (locate_result.found)
{
/* Includes a path! Reverse scan for / in the arg, to get the
* base directory and filter (if any)
*/
str_copy(&s_dir_name_str, &s_filter_str);
str_split_char_reverse(&s_dir_name_str, &s_filter_str, '/');
/* If we have e.g. "ls /.message", we just ripped off the leading
* slash because it is the only one!
*/
if (str_isempty(&s_dir_name_str))
{
str_alloc_text(&s_dir_name_str, "/");
}
}
}
}
if (p_dir == 0)
{
/* NOTE - failure check done below, it's not forgotten */
p_dir = str_opendir(&s_dir_name_str);
}
/* Fine, do it */
if (stat_cmd)
{
use_control = 1;
str_append_char(&s_option_str, 'a');
vsf_cmdio_write_hyphen(p_sess, FTP_STATFILE_OK, "Status follows:");
}
else
{
int remote_fd = get_remote_transfer_fd(
p_sess, "Here comes the directory listing.");
if (vsf_sysutil_retval_is_error(remote_fd))
{
goto dir_close_out;
}
}
if (p_sess->is_anonymous && p_dir && tunable_anon_world_readable_only)
{
vsf_sysutil_dir_stat(p_dir, &s_p_dirstat);
if (!vsf_sysutil_statbuf_is_readable_other(s_p_dirstat))
{
dir_allow_read = 0;
}
}
if (p_dir != 0 && dir_allow_read)
{
retval = vsf_ftpdataio_transfer_dir(p_sess, use_control, p_dir,
&s_dir_name_str, &s_option_str,
&s_filter_str, full_details);
}
if (!stat_cmd)
{
if (vsf_ftpdataio_dispose_transfer_fd(p_sess) != 1 && retval == 0)
{
retval = -1;
}
}
if (stat_cmd)
{
vsf_cmdio_write(p_sess, FTP_STATFILE_OK, "End of status");
}
else if (retval != 0)
{
if (!p_sess->data_timeout)
{
vsf_cmdio_write(p_sess, FTP_BADSENDNET,
"Failure writing network stream.");
}
}
else if (p_dir == 0 || !dir_allow_read)
{
vsf_cmdio_write(p_sess, FTP_TRANSFEROK,
"Transfer done (but failed to open directory).");
}
else
{
vsf_cmdio_write(p_sess, FTP_TRANSFEROK, "Directory send OK.");
}
check_abor(p_sess);
dir_close_out:
if (p_dir)
{
vsf_sysutil_closedir(p_dir);
}
if (!stat_cmd)
{
port_cleanup(p_sess);
pasv_cleanup(p_sess);
}
}
static void
handle_type(struct vsf_session *p_sess : itype(_Ptr<struct vsf_session>))
{
str_upper(&p_sess->ftp_arg_str);
if (str_equal_text(&p_sess->ftp_arg_str, "I") ||
str_equal_text(&p_sess->ftp_arg_str, "L8") ||
str_equal_text(&p_sess->ftp_arg_str, "L 8"))
{
p_sess->is_ascii = 0;
vsf_cmdio_write(p_sess, FTP_TYPEOK, "Switching to Binary mode.");
}
else if (str_equal_text(&p_sess->ftp_arg_str, "A") ||
str_equal_text(&p_sess->ftp_arg_str, "A N"))
{
p_sess->is_ascii = 1;
vsf_cmdio_write(p_sess, FTP_TYPEOK, "Switching to ASCII mode.");
}
else
{
vsf_cmdio_write(p_sess, FTP_BADCMD, "Unrecognised TYPE command.");
}
}
static void
handle_port(struct vsf_session *p_sess : itype(_Ptr<struct vsf_session>))
{
unsigned short the_port;
unsigned char vals _Checked[6];
_Array_ptr<const unsigned char> p_raw : count(sizeof(vals)) = 0;
pasv_cleanup(p_sess);
port_cleanup(p_sess);
p_raw = vsf_sysutil_parse_uchar_string_sep(&p_sess->ftp_arg_str, ',', vals,
sizeof(vals));
if (p_raw == 0)
{
vsf_cmdio_write(p_sess, FTP_BADCMD, "Illegal PORT command.");
return;
}
the_port = (unsigned short) ((vals[4] << 8) | vals[5]);
vsf_sysutil_sockaddr_clone(&p_sess->p_port_sockaddr, p_sess->p_local_addr);
vsf_sysutil_sockaddr_set_ipv4addr(p_sess->p_port_sockaddr, vals);
vsf_sysutil_sockaddr_set_port(p_sess->p_port_sockaddr, the_port);
/* SECURITY:
* 1) Reject requests not connecting to the control socket IP
* 2) Reject connects to privileged ports
*/
if (!tunable_port_promiscuous)
{
if (!vsf_sysutil_sockaddr_addr_equal(p_sess->p_remote_addr,
p_sess->p_port_sockaddr) ||
vsf_sysutil_is_port_reserved(the_port))
{
vsf_cmdio_write(p_sess, FTP_BADCMD, "Illegal PORT command.");
port_cleanup(p_sess);
return;
}