static int deliver_mailbox_file(LOCAL_STATE state, USER_ATTR usr_attr)
{
const char *myname = "deliver_mailbox_file";
char *spool_dir;
char *mailbox;
DSN_BUF *why = state.msg_attr.why;
MBOX *mp;
int mail_copy_status;
int deliver_status;
int copy_flags;
VSTRING *biff;
long end;
struct stat st;
uid_t spool_uid;
gid_t spool_gid;
uid_t chown_uid;
gid_t chown_gid;
/*
* Make verbose logging easier to understand.
*/
state.level++;
if (msg_verbose)
MSG_LOG_STATE(myname, state);
/*
* Don't deliver trace-only requests.
*/
if (DEL_REQ_TRACE_ONLY(state.request->flags)) {
dsb_simple(why, "2.0.0", "delivers to mailbox");
return (sent(BOUNCE_FLAGS(state.request), SENT_ATTR(state.msg_attr)));
}
/*
* Initialize. Assume the operation will fail. Set the delivered
* attribute to reflect the final recipient.
*/
if (vstream_fseek(state.msg_attr.fp, state.msg_attr.offset, SEEK_SET) < 0)
msg_fatal("seek message file %s: %m", VSTREAM_PATH(state.msg_attr.fp));
if (var_frozen_delivered == 0)
state.msg_attr.delivered = state.msg_attr.rcpt.address;
mail_copy_status = MAIL_COPY_STAT_WRITE;
if (*var_home_mailbox) {
spool_dir = 0;
mailbox = concatenate(usr_attr.home, "/", var_home_mailbox, (char *) 0);
} else {
spool_dir = var_mail_spool_dir;
mailbox = concatenate(spool_dir, "/", state.msg_attr.user, (char *) 0);
}
/*
* Mailbox delivery with least privilege. As long as we do not use root
* privileges this code may also work over NFS.
*
* If delivering to the recipient's home directory, perform all operations
* (including file locking) as that user (Mike Muuss, Army Research
* Laboratory, USA).
*
* If delivering to the mail spool directory, and the spool directory is
* world-writable, deliver as the recipient; if the spool directory is
* group-writable, use the recipient user id and the mail spool group id.
*
* Otherwise, use root privileges and chown the mailbox.
*/
if (spool_dir == 0
|| stat(spool_dir, &st) < 0
|| (st.st_mode & S_IWOTH) != 0) {
spool_uid = usr_attr.uid;
spool_gid = usr_attr.gid;
} else if ((st.st_mode & S_IWGRP) != 0) {
spool_uid = usr_attr.uid;
spool_gid = st.st_gid;
} else {
spool_uid = 0;
spool_gid = 0;
}
if (spool_uid == usr_attr.uid) {
chown_uid = -1;
chown_gid = -1;
} else {
chown_uid = usr_attr.uid;
chown_gid = usr_attr.gid;
}
if (msg_verbose)
msg_info("spool_uid/gid %ld/%ld chown_uid/gid %ld/%ld",
(long) spool_uid, (long) spool_gid,
(long) chown_uid, (long) chown_gid);
/*
* Lock the mailbox and open/create the mailbox file. Depending on the
* type of locking used, we lock first or we open first.
*
* Write the file as the recipient, so that file quota work.
*/
copy_flags = MAIL_COPY_MBOX;
if ((local_deliver_hdr_mask & DELIVER_HDR_FILE) == 0)
copy_flags &= ~MAIL_COPY_DELIVERED;
set_eugid(spool_uid, spool_gid);
mp = mbox_open(mailbox, O_APPEND | O_WRONLY | O_CREAT,
S_IRUSR | S_IWUSR, &st, chown_uid, chown_gid,
local_mbox_lock_mask, "5.2.0", why);
if (mp != 0) {
if (spool_uid != usr_attr.uid || spool_gid != usr_attr.gid)
set_eugid(usr_attr.uid, usr_attr.gid);
if (S_ISREG(st.st_mode) == 0) {
vstream_fclose(mp->fp);
dsb_simple(why, "5.2.0",
"destination %s is not a regular file", mailbox);
} else if (var_strict_mbox_owner && st.st_uid != usr_attr.uid) {
vstream_fclose(mp->fp);
dsb_simple(why, "4.2.0",
"destination %s is not owned by recipient", mailbox);
msg_warn("specify \"%s = no\" to ignore mailbox ownership mismatch",
VAR_STRICT_MBOX_OWNER);
} else {
end = vstream_fseek(mp->fp, (off_t) 0, SEEK_END);
mail_copy_status = mail_copy(COPY_ATTR(state.msg_attr), mp->fp,
copy_flags, "\n", why);
}
if (spool_uid != usr_attr.uid || spool_gid != usr_attr.gid)
set_eugid(spool_uid, spool_gid);
mbox_release(mp);
}
set_eugid(var_owner_uid, var_owner_gid);
/*
* As the mail system, bounce, defer delivery, or report success.
*/
if (mail_copy_status & MAIL_COPY_STAT_CORRUPT) {
deliver_status = DEL_STAT_DEFER;
} else if (mail_copy_status != 0) {
vstring_sprintf_prepend(why->reason,
"cannot update mailbox %s for user %s. ",
mailbox, state.msg_attr.user);
deliver_status =
(STR(why->status)[0] == '4' ?
defer_append : bounce_append)
(BOUNCE_FLAGS(state.request), BOUNCE_ATTR(state.msg_attr));
} else {
dsb_simple(why, "2.0.0", "delivered to mailbox");
deliver_status = sent(BOUNCE_FLAGS(state.request),
SENT_ATTR(state.msg_attr));
if (var_biff) {
biff = vstring_alloc(100);
vstring_sprintf(biff, "%s@%ld", usr_attr.logname, (long) end);
biff_notify(STR(biff), VSTRING_LEN(biff) + 1);
vstring_free(biff);
}
}
/*
* Clean up.
*/
myfree(mailbox);
return (deliver_status);
}
static int deliver_mailbox_file(LOCAL_STATE state, USER_ATTR usr_attr)
{
const char *myname = "deliver_mailbox_file";
DSN_BUF *why = state.msg_attr.why;
MBOX *mp;
int mail_copy_status;
int deliver_status;
int copy_flags;
long end;
struct stat st;
/*
* Make verbose logging easier to understand.
*/
state.level++;
if (msg_verbose)
MSG_LOG_STATE(myname, state);
/*
* Don't deliver trace-only requests.
*/
if (DEL_REQ_TRACE_ONLY(state.request->flags)) {
dsb_simple(why, "2.0.0", "delivers to mailbox");
return (sent(BOUNCE_FLAGS(state.request),
SENT_ATTR(state.msg_attr)));
}
/*
* Initialize. Assume the operation will fail. Set the delivered
* attribute to reflect the final recipient.
*/
if (vstream_fseek(state.msg_attr.fp, state.msg_attr.offset, SEEK_SET) < 0)
msg_fatal("seek message file %s: %m", VSTREAM_PATH(state.msg_attr.fp));
state.msg_attr.delivered = state.msg_attr.rcpt.address;
mail_copy_status = MAIL_COPY_STAT_WRITE;
/*
* Lock the mailbox and open/create the mailbox file.
*
* Write the file as the recipient, so that file quota work.
*/
copy_flags = MAIL_COPY_MBOX;
set_eugid(usr_attr.uid, usr_attr.gid);
mp = mbox_open(usr_attr.mailbox, O_APPEND | O_WRONLY | O_CREAT,
S_IRUSR | S_IWUSR, &st, -1, -1,
virtual_mbox_lock_mask, "4.2.0", why);
if (mp != 0) {
if (S_ISREG(st.st_mode) == 0) {
vstream_fclose(mp->fp);
msg_warn("recipient %s: destination %s is not a regular file",
state.msg_attr.rcpt.address, usr_attr.mailbox);
dsb_simple(why, "5.3.5", "mail system configuration error");
} else if (var_strict_mbox_owner && st.st_uid != usr_attr.uid) {
vstream_fclose(mp->fp);
dsb_simple(why, "4.2.0",
"destination %s is not owned by recipient", usr_attr.mailbox);
msg_warn("specify \"%s = no\" to ignore mailbox ownership mismatch",
VAR_STRICT_MBOX_OWNER);
} else {
end = vstream_fseek(mp->fp, (off_t) 0, SEEK_END);
mail_copy_status = mail_copy(COPY_ATTR(state.msg_attr), mp->fp,
copy_flags, "\n", why);
}
mbox_release(mp);
}
set_eugid(var_owner_uid, var_owner_gid);
/*
* As the mail system, bounce, defer delivery, or report success.
*/
if (mail_copy_status & MAIL_COPY_STAT_CORRUPT) {
deliver_status = DEL_STAT_DEFER;
} else if (mail_copy_status != 0) {
vstring_sprintf_prepend(why->reason, "delivery failed to mailbox %s: ",
usr_attr.mailbox);
deliver_status =
(STR(why->status)[0] == '4' ?
defer_append : bounce_append)
(BOUNCE_FLAGS(state.request),
BOUNCE_ATTR(state.msg_attr));
} else {
dsb_simple(why, "2.0.0", "delivered to mailbox");
deliver_status = sent(BOUNCE_FLAGS(state.request),
SENT_ATTR(state.msg_attr));
}
return (deliver_status);
}
int deliver_file(LOCAL_STATE state, USER_ATTR usr_attr, char *path)
{
const char *myname = "deliver_file";
struct stat st;
MBOX *mp;
DSN_BUF *why = state.msg_attr.why;
int mail_copy_status = MAIL_COPY_STAT_WRITE;
int deliver_status;
int copy_flags;
/*
* Make verbose logging easier to understand.
*/
state.level++;
if (msg_verbose)
MSG_LOG_STATE(myname, state);
/*
* DUPLICATE ELIMINATION
*
* Skip this file if it was already delivered to as this user.
*/
if (been_here(state.dup_filter, "file %ld %s", (long) usr_attr.uid, path))
return (0);
/*
* DELIVERY POLICY
*
* Do we allow delivery to files?
*/
if ((local_file_deliver_mask & state.msg_attr.exp_type) == 0) {
dsb_simple(why, "5.7.1", "mail to file is restricted");
/* Account for possible owner- sender address override. */
return (bounce_workaround(state));
}
/*
* Don't deliver trace-only requests.
*/
if (DEL_REQ_TRACE_ONLY(state.request->flags)) {
dsb_simple(why, "2.0.0", "delivers to file: %s", path);
return (sent(BOUNCE_FLAGS(state.request),
SENT_ATTR(state.msg_attr)));
}
/*
* DELIVERY RIGHTS
*
* Use a default uid/gid when none are given.
*/
if (usr_attr.uid == 0 && (usr_attr.uid = var_default_uid) == 0)
msg_panic("privileged default user id");
if (usr_attr.gid == 0 && (usr_attr.gid = var_default_gid) == 0)
msg_panic("privileged default group id");
/*
* If the name ends in /, use maildir-style delivery instead.
*/
if (path[strlen(path) - 1] == '/')
return (deliver_maildir(state, usr_attr, path));
/*
* Deliver. From here on, no early returns or we have a memory leak.
*/
if (msg_verbose)
msg_info("deliver_file (%ld,%ld): %s",
(long) usr_attr.uid, (long) usr_attr.gid, path);
if (vstream_fseek(state.msg_attr.fp, state.msg_attr.offset, SEEK_SET) < 0)
msg_fatal("seek queue file %s: %m", state.msg_attr.queue_id);
/*
* As the specified user, open or create the file, lock it, and append
* the message.
*/
copy_flags = MAIL_COPY_MBOX;
if ((local_deliver_hdr_mask & DELIVER_HDR_FILE) == 0)
copy_flags &= ~MAIL_COPY_DELIVERED;
set_eugid(usr_attr.uid, usr_attr.gid);
mp = mbox_open(path, O_APPEND | O_CREAT | O_WRONLY,
S_IRUSR | S_IWUSR, &st, -1, -1,
local_mbox_lock_mask | MBOX_DOT_LOCK_MAY_FAIL,
"5.2.0", why);
if (mp != 0) {
if (S_ISREG(st.st_mode) && st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH)) {
vstream_fclose(mp->fp);
dsb_simple(why, "5.7.1", "file is executable");
} else {
mail_copy_status = mail_copy(COPY_ATTR(state.msg_attr), mp->fp,
S_ISREG(st.st_mode) ? copy_flags :
(copy_flags & ~MAIL_COPY_TOFILE),
"\n", why);
}
mbox_release(mp);
}
set_eugid(var_owner_uid, var_owner_gid);
/*
* As the mail system, bounce, defer delivery, or report success.
*/
if (mail_copy_status & MAIL_COPY_STAT_CORRUPT) {
deliver_status = DEL_STAT_DEFER;
} else if (mail_copy_status != 0) {
vstring_sprintf_prepend(why->reason,
"cannot append message to file %s: ", path);
if (STR(why->status)[0] == '4')
deliver_status =
defer_append(BOUNCE_FLAGS(state.request),
BOUNCE_ATTR(state.msg_attr));
else
/* Account for possible owner- sender address override. */
deliver_status = bounce_workaround(state);
} else {
dsb_simple(why, "2.0.0", "delivered to file: %s", path);
deliver_status = sent(BOUNCE_FLAGS(state.request),
SENT_ATTR(state.msg_attr));
}
return (deliver_status);
}
