* Exim - an Internet mail transport agent *
*************************************************/
-/* Copyright (c) University of Cambridge 1995 - 2018 */
+/* Copyright (c) University of Cambridge 1995 - 2020 */
/* Copyright (c) The Exim maintainers 2020 */
/* See the file NOTICE for conditions of use and distribution. */
/* Default private options block for the appendfile transport. */
appendfile_transport_options_block appendfile_transport_option_defaults = {
- NULL, /* filename */
- NULL, /* dirname */
- US"q${base62:$tod_epoch}-$inode", /* dirfilename */
- NULL, /* message_prefix (default reset in init if not bsmtp) */
- NULL, /* message_suffix (ditto) */
- US"anywhere", /* create_file_string (string value for create_file) */
- NULL, /* quota */
- NULL, /* quota_directory */
- NULL, /* quota_filecount */
- NULL, /* quota_size_regex */
- NULL, /* quota_warn_threshold */
- NULL, /* mailbox_size_string */
- NULL, /* mailbox_filecount_string */
- NULL, /* expand_maildir_use_size_file */
- US"^(?:cur|new|\\..*)$", /* maildir_dir_regex */
- NULL, /* maildir_tag */
- NULL, /* maildirfolder_create_regex */
- NULL, /* mailstore_prefix */
- NULL, /* mailstore_suffix */
- NULL, /* check_string (default changed for non-bsmtp file)*/
- NULL, /* escape_string (ditto) */
- NULL, /* file_format */
- 0, /* quota_value */
- 0, /* quota_warn_threshold_value */
- -1, /* mailbox_size_value */
- -1, /* mailbox_filecount_value */
- 0, /* quota_filecount_value */
- APPENDFILE_MODE, /* mode */
- APPENDFILE_DIRECTORY_MODE, /* dirmode */
- APPENDFILE_LOCKFILE_MODE, /* lockfile_mode */
- 30*60, /* lockfile_timeout */
- 0, /* lock_fcntl_timeout */
- 0, /* lock_flock_timeout */
- 10, /* lock_retries */
- 3, /* lock_interval */
- 10, /* maildir_retries */
- create_anywhere,/* create_file */
- 0, /* options */
- FALSE, /* allow_fifo */
- FALSE, /* allow_symlink */
- FALSE, /* check_group */
- TRUE, /* check_owner */
- TRUE, /* create_directory */
- FALSE, /* notify_comsat */
- TRUE, /* use_lockfile */
- FALSE, /* set_use_lockfile */
- TRUE, /* use_fcntl */
- FALSE, /* set_use_fcntl */
- FALSE, /* use_flock */
- FALSE, /* set_use_flock */
- FALSE, /* use_mbx_lock */
- FALSE, /* set_use_mbx_lock */
- FALSE, /* use_bsmtp */
- FALSE, /* use_crlf */
- FALSE, /* file_must_exist */
- TRUE, /* mode_fail_narrower */
- FALSE, /* maildir_format */
- FALSE, /* maildir_use_size_file */
- FALSE, /* mailstore_format */
- FALSE, /* mbx_format */
- FALSE, /* quota_warn_threshold_is_percent */
- TRUE, /* quota_is_inclusive */
- FALSE, /* quota_no_check */
- FALSE /* quota_filecount_no_check */
+ /* all non-mentioned members zero/null/false */
+ .dirfilename = US"q${base62:$tod_epoch}-$inode",
+ .create_file_string = US"anywhere",
+ .maildir_dir_regex = US"^(?:cur|new|\\..*)$",
+ .mailbox_size_value = -1,
+ .mailbox_filecount_value = -1,
+ .mode = APPENDFILE_MODE,
+ .dirmode = APPENDFILE_DIRECTORY_MODE,
+ .lockfile_mode = APPENDFILE_LOCKFILE_MODE,
+ .lockfile_timeout = 30*60,
+ .lock_retries = 10,
+ .lock_interval = 3,
+ .maildir_retries = 10,
+ .create_file = create_anywhere,
+ .check_owner = TRUE,
+ .create_directory = TRUE,
+ .notify_comsat = FALSE,
+ .use_lockfile = TRUE,
+ .use_fcntl = TRUE,
+ .mode_fail_narrower = TRUE,
+ .quota_is_inclusive = TRUE,
};
for (int i = 0; i < 5; i++)
{
- double d;
+ double d = default_value;
int no_check = 0;
uschar *which = NULL;
- if (q == NULL) d = default_value;
- else
+ if (q)
{
- uschar *rest;
- uschar *s = expand_string(q);
+ uschar * rest, * s;
- if (!s)
+ if (!(s = expand_string(q)))
{
*errmsg = string_sprintf("Expansion of \"%s\" in %s transport failed: "
"%s", q, tblock->name, expand_string_message);
break;
case 2:
- if (d >= 2.0*1024.0*1024.0*1024.0 && sizeof(off_t) <= 4)
- which = US"quota_warn_threshold";
+ if (d >= 2.0*1024.0*1024.0*1024.0 && sizeof(off_t) <= 4)
+ which = US"quota_warn_threshold";
ob->quota_warn_threshold_value = (off_t)d;
q = ob->mailbox_size_string;
default_value = -1.0;
{
appendfile_transport_options_block *ob =
(appendfile_transport_options_block *)(tblock->options_block);
+uschar * s;
/* Set up the setup entry point, to be called in the privileged state */
/* If "create_file" is set, check that a valid option is given, and set the
integer variable. */
-if (ob->create_file_string)
+if ((s = ob->create_file_string ) && *s)
{
- int value = 0;
- if (Ustrcmp(ob->create_file_string, "anywhere") == 0)
- value = create_anywhere;
- else if (Ustrcmp(ob->create_file_string, "belowhome") == 0)
- value = create_belowhome;
- else if (Ustrcmp(ob->create_file_string, "inhome") == 0)
- value = create_inhome;
+ int val = 0;
+ if (Ustrcmp(s, "anywhere") == 0) val = create_anywhere;
+ else if (*s == '/' || Ustrcmp(s, "belowhome") == 0) val = create_belowhome;
+ else if (Ustrcmp(s, "inhome") == 0) val = create_inhome;
else
log_write(0, LOG_PANIC_DIE|LOG_CONFIG,
- "invalid value given for \"file_create\" for the %s transport: %s",
- tblock->name, ob->create_file_string);
- ob->create_file = value;
+ "invalid value given for \"file_create\" for the %s transport: '%s'",
+ tblock->name, s);
+ ob->create_file = val;
}
/* If quota_warn_threshold is set, set up default for warn_message. It may
Arguments:
filename the file name
create_file the ob->create_file option
+ deliver_dir the delivery directory
Returns: TRUE if creation is permitted
*/
static BOOL
-check_creation(uschar *filename, int create_file)
+check_creation(uschar *filename, int create_file, const uschar * deliver_dir)
{
BOOL yield = TRUE;
-if (deliver_home && create_file != create_anywhere)
+if (deliver_dir && create_file != create_anywhere)
{
- int len = Ustrlen(deliver_home);
+ int len = Ustrlen(deliver_dir);
uschar *file = filename;
while (file[0] == '/' && file[1] == '/') file++;
- if (Ustrncmp(file, deliver_home, len) != 0 || file[len] != '/' ||
- ( Ustrchr(file+len+2, '/') != NULL &&
- (
- create_file != create_belowhome ||
- Ustrstr(file+len, "/../") != NULL
- )
- )
+ if ( Ustrncmp(file, deliver_dir, len) != 0
+ || file[len] != '/'
+ || Ustrchr(file+len+2, '/') != NULL
+ && ( create_file != create_belowhome
+ || Ustrstr(file+len, "/../") != NULL
+ )
) yield = FALSE;
/* If yield is TRUE, the file name starts with the home directory, and does
if (rp)
{
uschar hdbuffer[PATH_MAX+1];
- uschar *rph = deliver_home;
+ const uschar * rph = deliver_dir;
int rlen = Ustrlen(big_buffer);
- if ((rp = US realpath(CS deliver_home, CS hdbuffer)))
+ if ((rp = US realpath(CS deliver_dir, CS hdbuffer)))
{
rph = hdbuffer;
len = Ustrlen(rph);
{
yield = FALSE;
DEBUG(D_transport) debug_printf("Real path \"%s\" does not match \"%s\"\n",
- big_buffer, deliver_home);
+ big_buffer, deliver_dir);
}
}
}
appendfile_transport_options_block *ob =
(appendfile_transport_options_block *)(tblock->options_block);
struct stat statbuf;
+const uschar * deliver_dir;
uschar *fdname = NULL;
uschar *filename = NULL;
uschar *hitchname = NULL;
expand_string_message);
goto ret_panic;
}
-if (is_tainted(path))
- {
- addr->message = string_sprintf("Tainted '%s' (file or directory "
- "name for %s transport) not permitted", path, tblock->name);
- goto ret_panic;
- }
if (path[0] != '/')
{
return FALSE;
}
+/* If an absolute path was given for create_file the it overrides deliver_home
+(here) and de-taints the filename (below, after check_creation() */
+
+deliver_dir = *ob->create_file_string == '/'
+ ? ob->create_file_string : deliver_home;
+
/* Handle the case of a file name. If the file name is /dev/null, we can save
ourselves some effort and just give a success return right away. */
}
/* Set the name of the file to be opened, and the file to which the data
- is written, and find out if we are permitted to create a non-existent file. */
+ is written, and find out if we are permitted to create a non-existent file.
+ If the create_file option is an absolute path and the file was within it,
+ de-taint. Chaeck for a tainted path. */
+
+ if ( (allow_creation_here = check_creation(path, ob->create_file, deliver_dir))
+ && ob->create_file == create_belowhome)
+ if (is_tainted(path))
+ {
+ DEBUG(D_transport) debug_printf("de-tainting path '%s'\n", path);
+ path = string_copy_taint(path, FALSE);
+ }
+ if (is_tainted(path)) goto tainted_ret_panic;
dataname = filename = path;
- allow_creation_here = check_creation(filename, ob->create_file);
/* If ob->create_directory is set, attempt to create the directories in
which this mailbox lives, but only if we are permitted to create the file
addr->basic_errno = errno;
addr->message =
string_sprintf("failed to create directories for %s: %s", path,
- strerror(errno));
+ exim_errstr(errno));
DEBUG(D_transport) debug_printf("%s transport: %s\n", tblock->name, path);
return FALSE;
}
else
{
- uschar *check_path = path; /* Default quota check path */
+ uschar *check_path; /* Default quota check path */
const pcre *regex = NULL; /* Regex for file size from file name */
- if (!check_creation(string_sprintf("%s/any", path), ob->create_file))
+ if (!check_creation(string_sprintf("%s/any", path),
+ ob->create_file, deliver_dir))
{
addr->basic_errno = ERRNO_BADCREATE;
addr->message = string_sprintf("tried to create file in %s, but "
goto RETURN;
}
+ /* If the create_file option is an absolute path and the file was within
+ it, de-taint. Otherwise check for taint. */
+
+ if (is_tainted(path))
+ if (ob->create_file == create_belowhome)
+ {
+ DEBUG(D_transport) debug_printf("de-tainting path '%s'\n", path);
+ path = string_copy_taint(path, FALSE);
+ }
+ else
+ goto tainted_ret_panic;
+
+ check_path = path;
+
#ifdef SUPPORT_MAILDIR
/* For a maildir delivery, ensure that all the relevant directories exist,
and a maildirfolder file if necessary. */
return FALSE;
+tainted_ret_panic:
+ addr->message = string_sprintf("Tainted '%s' (file or directory "
+ "name for %s transport) not permitted", path, tblock->name);
ret_panic:
addr->transport_return = PANIC;
return FALSE;
git://git.exim.org / exim.git / blobdiff