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/* Copyright (c) 2013-2018 Dovecot authors, see the included COPYING file */
#include "lib.h"
#include "str.h"
#include "array.h"
#include "smtp-parser.h"
#include "smtp-address.h"
#include "smtp-reply.h"
#include "smtp-syntax.h"
#include "smtp-server-private.h"
/* RCPT command */
struct smtp_server_cmd_rcpt {
struct smtp_server_recipient *rcpt;
};
static void
cmd_rcpt_destroy(struct smtp_server_cmd_ctx *cmd ATTR_UNUSED,
struct smtp_server_cmd_rcpt *data)
{
smtp_server_recipient_destroy(&data->rcpt);
}
static bool
cmd_rcpt_check_state(struct smtp_server_cmd_ctx *cmd, bool next_to_reply)
{
struct smtp_server_connection *conn = cmd->conn;
struct smtp_server_command *command = cmd->cmd;
struct smtp_server_transaction *trans = conn->state.trans;
if (smtp_server_command_is_replied(command) &&
!smtp_server_command_replied_success(command) &&
!smtp_server_command_reply_is_forwarded(command))
return FALSE;
if (trans == NULL &&
(conn->state.pending_mail_cmds == 0 || next_to_reply)) {
smtp_server_reply(cmd,
503, "5.5.0", "MAIL needed first");
return FALSE;
}
if (conn->set.max_recipients > 0 && trans != NULL &&
smtp_server_transaction_rcpt_count(trans) >=
conn->set.max_recipients) {
smtp_server_reply(cmd,
451, "4.5.3", "Too many recipients");
return FALSE;
}
return TRUE;
}
static void
cmd_rcpt_completed(struct smtp_server_cmd_ctx *cmd,
struct smtp_server_cmd_rcpt *data)
{
struct smtp_server_connection *conn = cmd->conn;
struct smtp_server_command *command = cmd->cmd;
struct smtp_server_recipient *rcpt = data->rcpt;
i_assert(conn->state.pending_rcpt_cmds > 0);
conn->state.pending_rcpt_cmds--;
i_assert(smtp_server_command_is_replied(command));
i_assert(conn->state.state == SMTP_SERVER_STATE_RCPT_TO ||
!smtp_server_command_replied_success(command));
if (!smtp_server_command_replied_success(command)) {
/* Failure */
conn->state.denied_rcpt_cmds++;
smtp_server_recipient_denied(
rcpt, smtp_server_command_get_reply(cmd->cmd, 0));
return;
}
/* Success */
data->rcpt = NULL; /* clear to prevent destruction */
(void)smtp_server_recipient_approved(&rcpt);
}
static void
cmd_rcpt_recheck(struct smtp_server_cmd_ctx *cmd,
struct smtp_server_cmd_rcpt *data ATTR_UNUSED)
{
struct smtp_server_connection *conn = cmd->conn;
/* All preceeding commands have finished and now the transaction state
is clear. This provides the opportunity to re-check the transaction
state and abort the pending proxied mail command if it is bound to
fail */
if (!cmd_rcpt_check_state(cmd, TRUE))
return;
/* Advance state */
smtp_server_connection_set_state(conn, SMTP_SERVER_STATE_RCPT_TO,
smtp_address_encode(data->rcpt->path));
}
void smtp_server_cmd_rcpt(struct smtp_server_cmd_ctx *cmd,
const char *params)
{
struct smtp_server_connection *conn = cmd->conn;
const struct smtp_server_settings *set = &conn->set;
enum smtp_capability caps = set->capabilities;
const struct smtp_server_callbacks *callbacks = conn->callbacks;
struct smtp_server_command *command = cmd->cmd;
struct smtp_server_cmd_rcpt *rcpt_data;
struct smtp_server_recipient *rcpt;
enum smtp_address_parse_flags path_parse_flags;
enum smtp_param_rcpt_parse_flags param_parse_flags;
const char *const *param_extensions = NULL;
struct smtp_address *path;
struct smtp_params_rcpt rcpt_params;
enum smtp_param_parse_error pperror;
const char *error;
int ret;
/* rcpt = "RCPT TO:" ( "<Postmaster@" Domain ">" /
"<Postmaster>" / Forward-path ) [SP Rcpt-parameters] CRLF
Forward-path = Path
*/
/* Check transaction state as far as possible */
if (!cmd_rcpt_check_state(cmd, FALSE))
return;
/* ( "<Postmaster@" Domain ">" / "<Postmaster>" / Forward-path ) */
if (params == NULL || strncasecmp(params, "TO:", 3) != 0) {
smtp_server_reply(cmd,
501, "5.5.4", "Invalid parameters");
return;
}
if (params[3] != ' ' && params[3] != '\t') {
params += 3;
} else if ((set->workarounds &
SMTP_SERVER_WORKAROUND_WHITESPACE_BEFORE_PATH) != 0) {
params += 3;
while (*params == ' ' || *params == '\t')
params++;
} else {
smtp_server_reply(cmd, 501, "5.5.4",
"Invalid TO: "
"Unexpected whitespace before path");
return;
}
path_parse_flags = SMTP_ADDRESS_PARSE_FLAG_ALLOW_LOCALPART;
if ((set->workarounds & SMTP_SERVER_WORKAROUND_MAILBOX_FOR_PATH) != 0)
path_parse_flags |= SMTP_ADDRESS_PARSE_FLAG_BRACKETS_OPTIONAL;
if (smtp_address_parse_path_full(pool_datastack_create(), params,
path_parse_flags, &path, &error,
¶ms) < 0) {
smtp_server_reply(cmd,
501, "5.5.4", "Invalid TO: %s", error);
return;
}
if (*params == ' ')
params++;
else if (*params != '\0') {
smtp_server_reply(cmd, 501, "5.5.4",
"Invalid TO: Invalid character in path");
return;
}
if (path->domain == NULL && !conn->set.rcpt_domain_optional &&
strcasecmp(path->localpart, "postmaster") != 0) {
smtp_server_reply(cmd,
501, "5.5.4", "Invalid TO: Missing domain");
return;
}
/* [SP Rcpt-parameters] */
param_parse_flags = 0;
if (conn->set.rcpt_domain_optional)
param_parse_flags |= SMTP_PARAM_RCPT_FLAG_ORCPT_ALLOW_LOCALPART;
if (array_is_created(&conn->rcpt_param_extensions))
param_extensions = array_front(&conn->rcpt_param_extensions);
if (smtp_params_rcpt_parse(pool_datastack_create(), params,
param_parse_flags, caps, param_extensions,
&rcpt_params, &pperror, &error) < 0) {
switch (pperror) {
case SMTP_PARAM_PARSE_ERROR_BAD_SYNTAX:
smtp_server_reply(cmd,
501, "5.5.4", "%s", error);
break;
case SMTP_PARAM_PARSE_ERROR_NOT_SUPPORTED:
smtp_server_reply(cmd,
555, "5.5.4", "%s", error);
break;
default:
i_unreached();
}
return;
}
rcpt = smtp_server_recipient_create(cmd, path, &rcpt_params);
rcpt_data = p_new(cmd->pool, struct smtp_server_cmd_rcpt, 1);
rcpt_data->rcpt = rcpt;
command->data = rcpt_data;
smtp_server_command_add_hook(command, SMTP_SERVER_COMMAND_HOOK_NEXT,
cmd_rcpt_recheck, rcpt_data);
smtp_server_command_add_hook(command, SMTP_SERVER_COMMAND_HOOK_COMPLETED,
cmd_rcpt_completed, rcpt_data);
smtp_server_command_add_hook(command, SMTP_SERVER_COMMAND_HOOK_DESTROY,
cmd_rcpt_destroy, rcpt_data);
conn->state.pending_rcpt_cmds++;
smtp_server_command_ref(command);
i_assert(callbacks != NULL && callbacks->conn_cmd_rcpt != NULL);
struct event_reason *reason =
smtp_server_connection_reason_begin(conn, "cmd_rcpt");
ret = callbacks->conn_cmd_rcpt(conn->context, cmd, rcpt);
event_reason_end(&reason);
if (ret <= 0) {
i_assert(ret == 0 || smtp_server_command_is_replied(command));
/* Command is waiting for external event or it failed */
smtp_server_command_unref(&command);
return;
}
if (!smtp_server_command_is_replied(command)) {
/* Set generic RCPT success reply if none is provided */
smtp_server_cmd_rcpt_reply_success(cmd);
}
smtp_server_command_unref(&command);
}
bool smtp_server_command_is_rcpt(struct smtp_server_cmd_ctx *cmd)
{
return (cmd->cmd->reg->func == smtp_server_cmd_rcpt);
}
void smtp_server_cmd_rcpt_reply_success(struct smtp_server_cmd_ctx *cmd)
{
struct smtp_server_cmd_rcpt *rcpt_data = cmd->cmd->data;
i_assert(smtp_server_command_is_rcpt(cmd));
smtp_server_recipient_reply(rcpt_data->rcpt, 250, "2.1.5", "OK");
}
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