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/* Copyright (c) 2013-2018 Dovecot authors, see the included COPYING file */
#include "lib.h"
#include "array.h"
#include "ioloop.h"
#include "smtp-parser.h"
#include "smtp-syntax.h"
#include "smtp-address.h"
#include "smtp-server-private.h"
/* MAIL command */
static bool cmd_mail_check_state(struct smtp_server_cmd_ctx *cmd)
{
struct smtp_server_connection *conn = cmd->conn;
struct smtp_server_command *command = cmd->cmd;
if (smtp_server_command_is_replied(command) &&
!smtp_server_command_replied_success(command) &&
!smtp_server_command_reply_is_forwarded(command))
return FALSE;
if (conn->state.trans != NULL) {
smtp_server_reply(cmd, 503, "5.5.0", "MAIL already given");
return FALSE;
}
return TRUE;
}
static void
cmd_mail_completed(struct smtp_server_cmd_ctx *cmd,
struct smtp_server_cmd_mail *data)
{
struct smtp_server_connection *conn = cmd->conn;
struct smtp_server_command *command = cmd->cmd;
i_assert(conn->state.pending_mail_cmds > 0);
conn->state.pending_mail_cmds--;
i_assert(smtp_server_command_is_replied(command));
i_assert(conn->state.state == SMTP_SERVER_STATE_MAIL_FROM ||
!smtp_server_command_replied_success(command));
if (!smtp_server_command_replied_success(command)) {
/* Failure */
return;
}
/* Success */
conn->state.trans = smtp_server_transaction_create(conn, data);
}
static void
cmd_mail_recheck(struct smtp_server_cmd_ctx *cmd,
struct smtp_server_cmd_mail *data)
{
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 */
if (!cmd_mail_check_state(cmd))
return;
/* Advance state */
smtp_server_connection_set_state(conn, SMTP_SERVER_STATE_MAIL_FROM,
smtp_address_encode(data->path));
}
void smtp_server_cmd_mail(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_mail *mail_data;
enum smtp_address_parse_flags path_parse_flags;
const char *const *param_extensions = NULL;
struct smtp_address *path = NULL;
enum smtp_param_parse_error pperror;
const char *error;
int ret;
/* mail = "MAIL FROM:" Reverse-path [SP Mail-parameters] CRLF
Reverse-path = Path / "<>"
*/
/* Check transaction state as far as possible */
if (!cmd_mail_check_state(cmd))
return;
/* Reverse-path */
if (params == NULL || strncasecmp(params, "FROM:", 5) != 0) {
smtp_server_reply(cmd, 501, "5.5.4", "Invalid parameters");
return;
}
if (params[5] != ' ' && params[5] != '\t') {
params += 5;
} else if ((set->workarounds &
SMTP_SERVER_WORKAROUND_WHITESPACE_BEFORE_PATH) != 0) {
params += 5;
while (*params == ' ' || *params == '\t')
params++;
} else {
smtp_server_reply(cmd, 501, "5.5.4",
"Invalid FROM: "
"Unexpected whitespace before path");
return;
}
path_parse_flags =
SMTP_ADDRESS_PARSE_FLAG_ALLOW_EMPTY |
SMTP_ADDRESS_PARSE_FLAG_PRESERVE_RAW;
if (*params != '\0' &&
(set->workarounds & SMTP_SERVER_WORKAROUND_MAILBOX_FOR_PATH) != 0)
path_parse_flags |= SMTP_ADDRESS_PARSE_FLAG_BRACKETS_OPTIONAL;
if (set->mail_path_allow_broken) {
path_parse_flags |=
SMTP_ADDRESS_PARSE_FLAG_ALLOW_BAD_LOCALPART |
SMTP_ADDRESS_PARSE_FLAG_IGNORE_BROKEN;
}
ret = smtp_address_parse_path_full(pool_datastack_create(), params,
path_parse_flags, &path, &error,
¶ms);
if (ret < 0 && !smtp_address_is_broken(path)) {
smtp_server_reply(cmd, 501, "5.5.4",
"Invalid FROM: %s", error);
return;
}
if (*params == ' ')
params++;
else if (*params != '\0') {
smtp_server_reply(
cmd, 501, "5.5.4",
"Invalid FROM: Invalid character in path");
return;
}
if (ret < 0) {
i_assert(set->mail_path_allow_broken);
e_debug(conn->event, "Invalid FROM: %s "
"(proceeding with <> as sender)", error);
}
mail_data = p_new(cmd->pool, struct smtp_server_cmd_mail, 1);
if (conn->set.protocol == SMTP_PROTOCOL_LMTP)
mail_data->flags |= SMTP_SERVER_TRANSACTION_FLAG_REPLY_PER_RCPT;
/* [SP Mail-parameters] */
if (array_is_created(&conn->mail_param_extensions))
param_extensions = array_front(&conn->mail_param_extensions);
if (smtp_params_mail_parse(cmd->pool, params, caps, param_extensions,
NULL, &mail_data->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;
}
if ((caps & SMTP_CAPABILITY_SIZE) != 0 && set->max_message_size > 0 &&
mail_data->params.size > set->max_message_size) {
smtp_server_reply(cmd, 552, "5.2.3",
"Message size exceeds administrative limit");
return;
}
mail_data->path = smtp_address_clone(cmd->pool, path);
mail_data->timestamp = ioloop_timeval;
smtp_server_command_add_hook(command, SMTP_SERVER_COMMAND_HOOK_NEXT,
cmd_mail_recheck, mail_data);
smtp_server_command_add_hook(command, SMTP_SERVER_COMMAND_HOOK_COMPLETED,
cmd_mail_completed, mail_data);
smtp_server_connection_set_state(conn, SMTP_SERVER_STATE_MAIL_FROM,
smtp_address_encode(mail_data->path));
conn->state.pending_mail_cmds++;
smtp_server_command_ref(command);
if (callbacks != NULL && callbacks->conn_cmd_mail != NULL) {
/* Specific implementation of MAIL command */
struct event_reason *reason =
smtp_server_connection_reason_begin(conn, "cmd_mail");
ret = callbacks->conn_cmd_mail(conn->context, cmd, mail_data);
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 MAIL success reply if none is provided */
smtp_server_cmd_mail_reply_success(cmd);
}
smtp_server_command_unref(&command);
}
void smtp_server_cmd_mail_reply_success(struct smtp_server_cmd_ctx *cmd)
{
i_assert(cmd->cmd->reg->func == smtp_server_cmd_mail);
smtp_server_reply(cmd, 250, "2.1.0", "OK");
}
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