struct mypasswd *mypwnam(const char *name)
{
struct mypasswd *mypwd;
while ((errno = mypwnam_err(name, &mypwd)) != 0) {
msg_warn("getpwnam_r: %m");
sleep(MYPWD_ERROR_DELAY);
}
return (mypwd);
}
static int deliver_switch(LOCAL_STATE state, USER_ATTR usr_attr)
{
const char *myname = "deliver_switch";
int status = 0;
struct stat st;
struct mypasswd *mypwd;
/*
* Make verbose logging easier to understand.
*/
state.level++;
if (msg_verbose)
MSG_LOG_STATE(myname, state);
/*
* \user is special: it means don't do any alias or forward expansion.
*
* XXX This code currently does not work due to revision of the RFC822
* address parser. \user should be permitted only in locally specified
* aliases, includes or forward files.
*
* XXX Should test for presence of user home directory.
*/
if (state.msg_attr.rcpt.address[0] == '\\') {
state.msg_attr.rcpt.address++, state.msg_attr.local++, state.msg_attr.user++;
if (deliver_mailbox(state, usr_attr, &status) == 0)
status = deliver_unknown(state, usr_attr);
return (status);
}
/*
* Otherwise, alias expansion has highest precedence. First look up the
* full localpart, then the bare user. Obey the address extension
* propagation policy.
*/
state.msg_attr.unmatched = 0;
if (deliver_alias(state, usr_attr, state.msg_attr.local, &status))
return (status);
if (state.msg_attr.extension != 0) {
if (local_ext_prop_mask & EXT_PROP_ALIAS)
state.msg_attr.unmatched = state.msg_attr.extension;
if (deliver_alias(state, usr_attr, state.msg_attr.user, &status))
return (status);
state.msg_attr.unmatched = state.msg_attr.extension;
}
/*
* Special case for mail locally forwarded or aliased to a different
* local address. Resubmit the message via the cleanup service, so that
* each recipient gets a separate delivery queue file status record in
* the new queue file. The downside of this approach is that mutually
* recursive .forward files cause a mail forwarding loop. Fortunately,
* the loop can be broken by the use of the Delivered-To: message header.
*
* The code below must not trigger on mail sent to an alias that has no
* owner- companion, so that mail for an alias first.last->username is
* delivered directly, instead of going through username->first.last
* canonical mappings in the cleanup service. The downside of this
* approach is that recipients in the expansion of an alias without
* owner- won't have separate delivery queue file status records, because
* for them, the message won't be resubmitted as a new queue file.
*
* Do something sensible on systems that receive mail for multiple domains,
* such as primary.name and secondary.name. Don't resubmit the message
* when mail for `[email protected]' is delivered to a .forward file
* that lists `user' or `[email protected]'. We already know that the
* recipient domain is local, so we only have to compare local parts.
*/
if (state.msg_attr.owner != 0
&& strcasecmp(state.msg_attr.owner, state.msg_attr.user) != 0)
return (deliver_indirect(state));
/*
* Always forward recipients in :include: files.
*/
if (state.msg_attr.exp_type == EXPAND_TYPE_INCL)
return (deliver_indirect(state));
/*
* Delivery to local user. First try expansion of the recipient's
* $HOME/.forward file, then mailbox delivery. Back off when the user's
* home directory does not exist.
*/
mypwd = 0;
if (var_stat_home_dir
&& (errno = mypwnam_err(state.msg_attr.user, &mypwd)) != 0) {
msg_warn("error looking up passwd info for %s: %m",
state.msg_attr.user);
dsb_simple(state.msg_attr.why, "4.0.0", "user lookup error");
return (defer_append(BOUNCE_FLAGS(state.request),
BOUNCE_ATTR(state.msg_attr)));
}
if (mypwd != 0) {
if (stat_as(mypwd->pw_dir, &st, mypwd->pw_uid, mypwd->pw_gid) < 0) {
dsb_simple(state.msg_attr.why, "4.3.0",
"cannot access home directory %s: %m", mypwd->pw_dir);
mypwfree(mypwd);
return (defer_append(BOUNCE_FLAGS(state.request),
BOUNCE_ATTR(state.msg_attr)));
}
mypwfree(mypwd);
}
if (deliver_dotforward(state, usr_attr, &status) == 0
&& deliver_mailbox(state, usr_attr, &status) == 0)
status = deliver_unknown(state, usr_attr);
return (status);
}
int deliver_mailbox(LOCAL_STATE state, USER_ATTR usr_attr, int *statusp)
{
const char *myname = "deliver_mailbox";
int status;
struct mypasswd *mbox_pwd;
char *path;
static MAPS *transp_maps;
const char *map_transport;
static MAPS *cmd_maps;
const char *map_command;
/*
* Make verbose logging easier to understand.
*/
state.level++;
if (msg_verbose)
MSG_LOG_STATE(myname, state);
/*
* DUPLICATE ELIMINATION
*
* Don't come here more than once, whether or not the recipient exists.
*/
if (been_here(state.dup_filter, "mailbox %s", state.msg_attr.local))
return (YES);
/*
* Delegate mailbox delivery to another message transport.
*/
if (*var_mbox_transp_maps && transp_maps == 0)
transp_maps = maps_create(VAR_MBOX_TRANSP_MAPS, var_mbox_transp_maps,
DICT_FLAG_LOCK | DICT_FLAG_NO_REGSUB);
/* The -1 is a hint for the down-stream deliver_completed() function. */
if (transp_maps
&& (map_transport = maps_find(transp_maps, state.msg_attr.user,
DICT_FLAG_NONE)) != 0) {
state.msg_attr.rcpt.offset = -1L;
*statusp = deliver_pass(MAIL_CLASS_PRIVATE, map_transport,
state.request, &state.msg_attr.rcpt);
return (YES);
} else if (transp_maps && transp_maps->error != 0) {
/* Details in the logfile. */
dsb_simple(state.msg_attr.why, "4.3.0", "table lookup failure");
*statusp = defer_append(BOUNCE_FLAGS(state.request),
BOUNCE_ATTR(state.msg_attr));
return (YES);
}
if (*var_mailbox_transport) {
state.msg_attr.rcpt.offset = -1L;
*statusp = deliver_pass(MAIL_CLASS_PRIVATE, var_mailbox_transport,
state.request, &state.msg_attr.rcpt);
return (YES);
}
/*
* Skip delivery when this recipient does not exist.
*/
if ((errno = mypwnam_err(state.msg_attr.user, &mbox_pwd)) != 0) {
msg_warn("error looking up passwd info for %s: %m",
state.msg_attr.user);
dsb_simple(state.msg_attr.why, "4.0.0", "user lookup error");
*statusp = defer_append(BOUNCE_FLAGS(state.request),
BOUNCE_ATTR(state.msg_attr));
return (YES);
}
if (mbox_pwd == 0)
return (NO);
/*
* No early returns or we have a memory leak.
*/
/*
* DELIVERY RIGHTS
*
* Use the rights of the recipient user.
*/
SET_USER_ATTR(usr_attr, mbox_pwd, state.level);
/*
* Deliver to mailbox, maildir or to external command.
*/
#define LAST_CHAR(s) (s[strlen(s) - 1])
if (*var_mailbox_cmd_maps && cmd_maps == 0)
cmd_maps = maps_create(VAR_MAILBOX_CMD_MAPS, var_mailbox_cmd_maps,
DICT_FLAG_LOCK | DICT_FLAG_PARANOID);
if (cmd_maps && (map_command = maps_find(cmd_maps, state.msg_attr.user,
DICT_FLAG_NONE)) != 0) {
status = deliver_command(state, usr_attr, map_command);
} else if (cmd_maps && cmd_maps->error != 0) {
/* Details in the logfile. */
dsb_simple(state.msg_attr.why, "4.3.0", "table lookup failure");
status = defer_append(BOUNCE_FLAGS(state.request),
BOUNCE_ATTR(state.msg_attr));
} else if (*var_mailbox_command) {
status = deliver_command(state, usr_attr, var_mailbox_command);
} else if (*var_home_mailbox && LAST_CHAR(var_home_mailbox) == '/') {
path = concatenate(usr_attr.home, "/", var_home_mailbox, (char *) 0);
status = deliver_maildir(state, usr_attr, path);
myfree(path);
} else if (*var_mail_spool_dir && LAST_CHAR(var_mail_spool_dir) == '/') {
path = concatenate(var_mail_spool_dir, state.msg_attr.user,
"/", (char *) 0);
status = deliver_maildir(state, usr_attr, path);
myfree(path);
} else
status = deliver_mailbox_file(state, usr_attr);
/*
* Cleanup.
*/
mypwfree(mbox_pwd);
*statusp = status;
return (YES);
}
int deliver_dotforward(LOCAL_STATE state, USER_ATTR usr_attr, int *statusp)
{
const char *myname = "deliver_dotforward";
struct stat st;
VSTRING *path;
struct mypasswd *mypwd;
int fd;
VSTREAM *fp;
int status;
int forward_found = NO;
int lookup_status;
int addr_count;
char *saved_forward_path;
char *lhs;
char *next;
int expand_status;
int saved_notify;
/*
* Make verbose logging easier to understand.
*/
state.level++;
if (msg_verbose)
MSG_LOG_STATE(myname, state);
/*
* Skip this module if per-user forwarding is disabled.
*/
if (*var_forward_path == 0)
return (NO);
/*
* Skip non-existing users. The mailbox delivery routine will catch the
* error.
*/
if ((errno = mypwnam_err(state.msg_attr.user, &mypwd)) != 0) {
msg_warn("error looking up passwd info for %s: %m",
state.msg_attr.user);
dsb_simple(state.msg_attr.why, "4.0.0", "user lookup error");
*statusp = defer_append(BOUNCE_FLAGS(state.request),
BOUNCE_ATTR(state.msg_attr));
return (YES);
}
if (mypwd == 0)
return (NO);
/*
* From here on no early returns or we have a memory leak.
*/
/*
* EXTERNAL LOOP CONTROL
*
* Set the delivered message attribute to the recipient, so that this
* message will list the correct forwarding address.
*/
if (var_frozen_delivered == 0)
state.msg_attr.delivered = state.msg_attr.rcpt.address;
/*
* DELIVERY RIGHTS
*
* Do not inherit rights from the .forward file owner. Instead, use the
* recipient's rights, and insist that the .forward file is owned by the
* recipient. This is a small but significant difference. Use the
* recipient's rights for all /file and |command deliveries, and pass on
* these rights to command/file destinations in included files. When
* these are the rights of root, the /file and |command delivery routines
* will use unprivileged default rights instead. Better safe than sorry.
*/
SET_USER_ATTR(usr_attr, mypwd, state.level);
/*
* DELIVERY POLICY
*
* Update the expansion type attribute so that we can decide if deliveries
* to |command and /file/name are allowed at all.
*/
state.msg_attr.exp_type = EXPAND_TYPE_FWD;
/*
* WHERE TO REPORT DELIVERY PROBLEMS
*
* Set the owner attribute so that 1) include files won't set the sender to
* be this user and 2) mail forwarded to other local users will be
* resubmitted as a new queue file.
*/
state.msg_attr.owner = state.msg_attr.user;
/*
* Search the forward_path for an existing forward file.
*
* If unmatched extensions should never be propagated, or if a forward file
* name includes the address extension, don't propagate the extension to
* the recipient addresses.
*/
status = 0;
path = vstring_alloc(100);
saved_forward_path = mystrdup(var_forward_path);
next = saved_forward_path;
lookup_status = -1;
while ((lhs = mystrtok(&next, ", \t\r\n")) != 0) {
expand_status = local_expand(path, lhs, &state, &usr_attr,
var_fwd_exp_filter);
if ((expand_status & (MAC_PARSE_ERROR | MAC_PARSE_UNDEF)) == 0) {
lookup_status =
lstat_as(STR(path), &st, usr_attr.uid, usr_attr.gid);
if (msg_verbose)
msg_info("%s: path %s expand_status %d look_status %d", myname,
STR(path), expand_status, lookup_status);
if (lookup_status >= 0) {
if ((expand_status & LOCAL_EXP_EXTENSION_MATCHED) != 0
|| (local_ext_prop_mask & EXT_PROP_FORWARD) == 0)
state.msg_attr.unmatched = 0;
break;
}
}
}
/*
* Process the forward file.
*
* Assume that usernames do not have file system meta characters. Open the
* .forward file as the user. Ignore files that aren't regular files,
* files that are owned by the wrong user, or files that have world write
* permission enabled.
*
* DUPLICATE/LOOP ELIMINATION
*
* If this user includes (an alias of) herself in her own .forward file,
* deliver to the user instead.
*/
if (lookup_status >= 0) {
/*
* Don't expand a verify-only request.
*/
if (state.request->flags & DEL_REQ_FLAG_MTA_VRFY) {
dsb_simple(state.msg_attr.why, "2.0.0",
"forward via file: %s", STR(path));
*statusp = sent(BOUNCE_FLAGS(state.request),
SENT_ATTR(state.msg_attr));
forward_found = YES;
} else if (been_here(state.dup_filter, "forward %s", STR(path)) == 0) {
state.msg_attr.exp_from = state.msg_attr.local;
if (S_ISREG(st.st_mode) == 0) {
msg_warn("file %s is not a regular file", STR(path));
} else if (st.st_uid != 0 && st.st_uid != usr_attr.uid) {
msg_warn("file %s has bad owner uid %ld",
STR(path), (long) st.st_uid);
} else if (st.st_mode & 002) {
msg_warn("file %s is world writable", STR(path));
} else if ((fd = open_as(STR(path), O_RDONLY, 0, usr_attr.uid, usr_attr.gid)) < 0) {
msg_warn("cannot open file %s: %m", STR(path));
} else {
/*
* XXX DSN. When delivering to an alias (i.e. the envelope
* sender address is not replaced) any ENVID, RET, or ORCPT
* parameters are propagated to all forwarding addresses
* associated with that alias. The NOTIFY parameter is
* propagated to the forwarding addresses, except that any
* SUCCESS keyword is removed.
*/
close_on_exec(fd, CLOSE_ON_EXEC);
addr_count = 0;
fp = vstream_fdopen(fd, O_RDONLY);
saved_notify = state.msg_attr.rcpt.dsn_notify;
state.msg_attr.rcpt.dsn_notify =
(saved_notify == DSN_NOTIFY_SUCCESS ?
DSN_NOTIFY_NEVER : saved_notify & ~DSN_NOTIFY_SUCCESS);
status = deliver_token_stream(state, usr_attr, fp, &addr_count);
if (vstream_fclose(fp))
msg_warn("close file %s: %m", STR(path));
if (addr_count > 0) {
forward_found = YES;
been_here(state.dup_filter, "forward-done %s", STR(path));
/*
* XXX DSN. When delivering to an alias (i.e. the
* envelope sender address is not replaced) and the
* original NOTIFY parameter for the alias contained the
* SUCCESS keyword, an "expanded" DSN is issued for the
* alias.
*/
if (status == 0 && (saved_notify & DSN_NOTIFY_SUCCESS)) {
state.msg_attr.rcpt.dsn_notify = saved_notify;
dsb_update(state.msg_attr.why, "2.0.0", "expanded",
DSB_SKIP_RMTA, DSB_SKIP_REPLY,
"alias expanded");
(void) trace_append(BOUNCE_FLAG_NONE,
SENT_ATTR(state.msg_attr));
}
}
}
} else if (been_here_check(state.dup_filter, "forward-done %s", STR(path)) != 0)
forward_found = YES; /* else we're recursive */
}
/*
* Clean up.
*/
vstring_free(path);
myfree(saved_forward_path);
mypwfree(mypwd);
*statusp = status;
return (forward_found);
}
