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/* Copyright (c) 2002-2018 Dovecot authors, see the included COPYING file */
#include "login-common.h"
#include "str.h"
#include "imap-parser.h"
#include "imap-quote.h"
#include "imap-login-settings.h"
#include "imap-login-client.h"
struct imap_id_param_handler {
const char *key;
bool key_is_prefix;
void (*callback)(struct imap_client *client,
const char *key, const char *value);
};
static void
cmd_id_x_originating_ip(struct imap_client *client,
const char *key ATTR_UNUSED, const char *value)
{
(void)net_addr2ip(value, &client->common.ip);
}
static void
cmd_id_x_originating_port(struct imap_client *client,
const char *key ATTR_UNUSED, const char *value)
{
(void)net_str2port(value, &client->common.remote_port);
}
static void
cmd_id_x_connected_ip(struct imap_client *client,
const char *key ATTR_UNUSED, const char *value)
{
(void)net_addr2ip(value, &client->common.local_ip);
}
static void
cmd_id_x_connected_port(struct imap_client *client,
const char *key ATTR_UNUSED, const char *value)
{
(void)net_str2port(value, &client->common.local_port);
}
static void
cmd_id_x_proxy_ttl(struct imap_client *client,
const char *key ATTR_UNUSED, const char *value)
{
if (str_to_uint(value, &client->common.proxy_ttl) < 0) {
/* nothing */
}
}
static void
cmd_id_x_session_id(struct imap_client *client,
const char *key ATTR_UNUSED, const char *value)
{
if (strlen(value) <= LOGIN_MAX_SESSION_ID_LEN) {
client->common.session_id =
p_strdup(client->common.pool, value);
}
}
static void
cmd_id_x_forward_(struct imap_client *client,
const char *key, const char *value)
{
i_assert(strncasecmp(key, "x-forward-", 10) == 0);
client_add_forward_field(&client->common, key+10, value);
}
static const struct imap_id_param_handler imap_login_id_params[] = {
{ "x-originating-ip", FALSE, cmd_id_x_originating_ip },
{ "x-originating-port", FALSE, cmd_id_x_originating_port },
{ "x-connected-ip", FALSE, cmd_id_x_connected_ip },
{ "x-connected-port", FALSE, cmd_id_x_connected_port },
{ "x-proxy-ttl", FALSE, cmd_id_x_proxy_ttl },
{ "x-session-id", FALSE, cmd_id_x_session_id },
{ "x-session-ext-id", FALSE, cmd_id_x_session_id },
{ "x-forward-", TRUE, cmd_id_x_forward_ },
{ NULL, FALSE, NULL }
};
static const struct imap_id_param_handler *
imap_id_param_handler_find(const char *key)
{
for (unsigned int i = 0; imap_login_id_params[i].key != NULL; i++) {
unsigned int prefix_len = strlen(imap_login_id_params[i].key);
if (strncasecmp(imap_login_id_params[i].key, key, prefix_len) == 0 &&
(key[prefix_len] == '\0' ||
imap_login_id_params[i].key_is_prefix))
return &imap_login_id_params[i];
}
return NULL;
}
static bool
client_try_update_info(struct imap_client *client,
const char *key, const char *value)
{
const struct imap_id_param_handler *handler;
handler = imap_id_param_handler_find(key);
if (handler == NULL)
return FALSE;
/* do not try to process NIL values as client-info,
but store them for non-reserved keys */
if (client->common.trusted && !client->id_logged && value != NULL)
handler->callback(client, key, value);
return TRUE;
}
static void cmd_id_handle_keyvalue(struct imap_client *client,
const char *key, const char *value)
{
bool client_id_str;
/* length of key + length of value (NIL for NULL) and two set of
quotes and space */
size_t kvlen = strlen(key) + 2 + 1 +
(value == NULL ? 3 : strlen(value)) + 2;
client_id_str = !client_try_update_info(client, key, value);
if (client->set->imap_id_retain && client_id_str &&
(client->common.client_id == NULL ||
str_len(client->common.client_id) + kvlen < LOGIN_MAX_CLIENT_ID_LEN)) {
if (client->common.client_id == NULL) {
client->common.client_id = str_new(client->common.preproxy_pool, 64);
} else {
str_append_c(client->common.client_id, ' ');
}
imap_append_quoted(client->common.client_id, key);
str_append_c(client->common.client_id, ' ');
if (value == NULL)
str_append(client->common.client_id, "NIL");
else
imap_append_quoted(client->common.client_id, value);
}
if (client->cmd_id->log_reply != NULL &&
(client->cmd_id->log_keys == NULL ||
str_array_icase_find((void *)client->cmd_id->log_keys, key)))
imap_id_log_reply_append(client->cmd_id->log_reply, key, value);
}
static int cmd_id_handle_args(struct imap_client *client,
const struct imap_arg *arg)
{
struct imap_client_cmd_id *id = client->cmd_id;
const char *key, *value;
switch (id->state) {
case IMAP_CLIENT_ID_STATE_LIST:
if (arg->type == IMAP_ARG_NIL)
return 1;
if (arg->type != IMAP_ARG_LIST)
return -1;
if (client->set->imap_id_log[0] == '\0') {
/* no ID logging */
} else if (client->id_logged) {
/* already logged the ID reply */
} else {
id->log_reply = str_new(default_pool, 64);
if (strcmp(client->set->imap_id_log, "*") == 0) {
/* log all keys */
} else {
/* log only specified keys */
id->log_keys = p_strsplit_spaces(default_pool,
client->set->imap_id_log, " ");
}
}
id->state = IMAP_CLIENT_ID_STATE_KEY;
break;
case IMAP_CLIENT_ID_STATE_KEY:
if (!imap_arg_get_string(arg, &key))
return -1;
if (i_strocpy(id->key, key, sizeof(id->key)) < 0)
return -1;
id->state = IMAP_CLIENT_ID_STATE_VALUE;
break;
case IMAP_CLIENT_ID_STATE_VALUE:
if (!imap_arg_get_nstring(arg, &value))
return -1;
cmd_id_handle_keyvalue(client, id->key, value);
id->state = IMAP_CLIENT_ID_STATE_KEY;
break;
}
return 0;
}
static void cmd_id_finish(struct imap_client *client)
{
/* finished handling the parameters */
if (!client->id_logged) {
client->id_logged = TRUE;
if (client->cmd_id->log_reply != NULL) {
e_info(client->common.event, "ID sent: %s",
str_c(client->cmd_id->log_reply));
}
}
client_send_raw(&client->common,
t_strdup_printf("* ID %s\r\n",
imap_id_reply_generate(client->set->imap_id_send)));
client_send_reply(&client->common, IMAP_CMD_REPLY_OK, "ID completed.");
}
static void cmd_id_free(struct imap_client *client)
{
struct imap_client_cmd_id *id = client->cmd_id;
str_free(&id->log_reply);
if (id->log_keys != NULL)
p_strsplit_free(default_pool, id->log_keys);
imap_parser_unref(&id->parser);
i_free_and_null(client->cmd_id);
client->skip_line = TRUE;
}
int cmd_id(struct imap_client *client)
{
struct imap_client_cmd_id *id;
enum imap_parser_flags parser_flags;
const struct imap_arg *args;
int ret;
if (client->common.client_id != NULL)
str_truncate(client->common.client_id, 0);
if (client->cmd_id == NULL) {
client->cmd_id = id = i_new(struct imap_client_cmd_id, 1);
id->parser = imap_parser_create(client->common.input,
client->common.output,
IMAP_LOGIN_MAX_LINE_LENGTH);
if (client->set->imap_literal_minus)
imap_parser_enable_literal_minus(id->parser);
parser_flags = IMAP_PARSE_FLAG_STOP_AT_LIST;
} else {
id = client->cmd_id;
parser_flags = IMAP_PARSE_FLAG_INSIDE_LIST;
}
while ((ret = imap_parser_read_args(id->parser, 1, parser_flags, &args)) > 0) {
i_assert(ret == 1);
if ((ret = cmd_id_handle_args(client, args)) < 0) {
client_send_reply(&client->common,
IMAP_CMD_REPLY_BAD,
"Invalid ID parameters");
cmd_id_free(client);
return -1;
}
if (ret > 0) {
/* NIL parameter */
ret = 0;
break;
}
imap_parser_reset(id->parser);
parser_flags = IMAP_PARSE_FLAG_INSIDE_LIST;
}
if (ret == 0) {
/* finished the line */
cmd_id_finish(client);
cmd_id_free(client);
return 1;
} else if (ret == -1) {
if (!client_handle_parser_error(client, id->parser))
return 0;
cmd_id_free(client);
return -1;
} else {
i_assert(ret == -2);
return 0;
}
}
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