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/* Copyright (c) 2013-2018 Dovecot authors, see the included COPYING file */
#include "lib.h"
#include "str.h"
#include "str-sanitize.h"
#include "ostream.h"
#include "connection.h"
#include "restrict-access.h"
#include "settings-parser.h"
#include "master-service.h"
#include "master-service-settings.h"
#include "mail-namespace.h"
#include "mail-storage.h"
#include "mail-storage-settings.h"
#include "mail-storage-service.h"
#include "smtp-address.h"
#include "quota-private.h"
#include "quota-plugin.h"
#include "quota-status-settings.h"
enum quota_protocol {
QUOTA_PROTOCOL_UNKNOWN = 0,
QUOTA_PROTOCOL_POSTFIX
};
struct quota_client {
struct connection conn;
struct event *event;
char *state;
char *recipient;
uoff_t size;
bool warned_bad_state:1;
};
static struct event_category event_category_quota_status = {
.name = "quota-status"
};
static struct quota_status_settings *quota_status_settings;
static pool_t quota_status_pool;
static enum quota_protocol protocol;
static struct mail_storage_service_ctx *storage_service;
static struct connection_list *clients;
static char *nouser_reply;
static void client_connected(struct master_service_connection *conn)
{
struct quota_client *client;
client = i_new(struct quota_client, 1);
client->event = event_create(NULL);
client->conn.event_parent = client->event;
event_add_category(client->event, &event_category_quota_status);
connection_init_server(clients, &client->conn,
"quota-client", conn->fd, conn->fd);
master_service_client_connection_accept(conn);
e_debug(client->event, "Client connected");
}
static void client_reset(struct quota_client *client)
{
i_free(client->state);
i_free(client->recipient);
}
static enum quota_alloc_result
quota_check(struct mail_user *user, uoff_t mail_size, const char **error_r)
{
struct quota_user *quser = QUOTA_USER_CONTEXT(user);
struct mail_namespace *ns;
struct mailbox *box;
struct quota_transaction_context *ctx;
enum quota_alloc_result ret;
if (quser == NULL) {
/* no quota for user */
e_debug(user->event, "User has no quota");
return QUOTA_ALLOC_RESULT_OK;
}
ns = mail_namespace_find_inbox(user->namespaces);
box = mailbox_alloc(ns->list, "INBOX", MAILBOX_FLAG_POST_SESSION);
ctx = quota_transaction_begin(box);
const char *internal_error;
ret = quota_test_alloc(ctx, I_MAX(1, mail_size), &internal_error);
if (ret == QUOTA_ALLOC_RESULT_TEMPFAIL)
e_error(user->event, "quota check failed: %s", internal_error);
*error_r = quota_alloc_result_errstr(ret, ctx);
quota_transaction_rollback(&ctx);
mailbox_free(&box);
return ret;
}
static int client_check_mta_state(struct quota_client *client)
{
if (client->state == NULL || strcasecmp(client->state, "RCPT") == 0)
return 0;
if (!client->warned_bad_state) {
e_warning(client->event,
"Received policy query from MTA in unexpected state %s "
"(service can only be used for recipient restrictions)",
client->state);
}
client->warned_bad_state = TRUE;
return -1;
}
static void client_handle_request(struct quota_client *client)
{
struct mail_storage_service_input input;
struct mail_storage_service_user *service_user;
struct mail_user *user;
struct smtp_address *rcpt;
const char *value = NULL, *error;
const char *detail ATTR_UNUSED;
char delim ATTR_UNUSED;
string_t *resp;
int ret;
if (client_check_mta_state(client) < 0 || client->recipient == NULL) {
e_debug(client->event, "Response: action=DUNNO");
o_stream_nsend_str(client->conn.output, "action=DUNNO\n\n");
return;
}
if (smtp_address_parse_path(pool_datastack_create(), client->recipient,
SMTP_ADDRESS_PARSE_FLAG_ALLOW_LOCALPART |
SMTP_ADDRESS_PARSE_FLAG_BRACKETS_OPTIONAL |
SMTP_ADDRESS_PARSE_FLAG_ALLOW_BAD_LOCALPART,
&rcpt, &error) < 0) {
e_error(client->event,
"Client sent invalid recipient address `%s': "
"%s", str_sanitize(client->recipient, 256), error);
e_debug(client->event, "Response: action=DUNNO");
o_stream_nsend_str(client->conn.output, "action=DUNNO\n\n");
return;
}
i_zero(&input);
input.event_parent = client->event;
smtp_address_detail_parse_temp(quota_status_settings->recipient_delimiter,
rcpt, &input.username, &delim,
&detail);
ret = mail_storage_service_lookup_next(storage_service, &input,
&service_user, &user, &error);
restrict_access_allow_coredumps(TRUE);
if (ret == 0) {
e_debug(client->event, "User `%s' not found", input.username);
value = nouser_reply;
} else if (ret > 0) {
enum quota_alloc_result qret = quota_check(user, client->size,
&error);
if (qret == QUOTA_ALLOC_RESULT_OK) {
e_debug(client->event,
"Message is acceptable");
} else {
e_debug(client->event,
"Quota check failed: %s", error);
}
switch (qret) {
case QUOTA_ALLOC_RESULT_OK: /* under quota */
value = mail_user_plugin_getenv(user,
"quota_status_success");
if (value == NULL)
value = "OK";
break;
case QUOTA_ALLOC_RESULT_OVER_MAXSIZE:
/* even over maximum quota */
case QUOTA_ALLOC_RESULT_OVER_QUOTA_LIMIT:
value = mail_user_plugin_getenv(user,
"quota_status_toolarge");
/* fall through */
case QUOTA_ALLOC_RESULT_OVER_QUOTA:
if (value == NULL)
value = mail_user_plugin_getenv(user,
"quota_status_overquota");
if (value == NULL)
value = t_strdup_printf("554 5.2.2 %s", error);
break;
case QUOTA_ALLOC_RESULT_TEMPFAIL:
case QUOTA_ALLOC_RESULT_BACKGROUND_CALC:
ret = -1;
break;
}
value = t_strdup(value); /* user's pool is being freed */
mail_user_deinit(&user);
mail_storage_service_user_unref(&service_user);
} else {
e_error(client->event,
"Failed to lookup user %s: %s", input.username, error);
error = "Temporary internal error";
}
resp = t_str_new(256);
if (ret < 0) {
/* temporary failure */
str_append(resp, "action=DEFER_IF_PERMIT ");
str_append(resp, error);
} else {
str_append(resp, "action=");
str_append(resp, value);
}
e_debug(client->event, "Response: %s", str_c(resp));
str_append(resp, "\n\n");
o_stream_nsend_str(client->conn.output, str_c(resp));
}
static int client_input_line(struct connection *conn, const char *line)
{
struct quota_client *client = (struct quota_client *)conn;
e_debug(client->event, "Request: %s", str_sanitize(line, 1024));
if (*line == '\0') {
o_stream_cork(conn->output);
client_handle_request(client);
o_stream_uncork(conn->output);
client_reset(client);
return 1;
}
if (str_begins(line, "recipient=")) {
if (client->recipient == NULL)
client->recipient = i_strdup(line + 10);
} else if (str_begins(line, "size=")) {
if (str_to_uoff(line+5, &client->size) < 0)
client->size = 0;
} else if (str_begins(line, "protocol_state=")) {
if (client->state == NULL)
client->state = i_strdup(line + 15);
}
return 1;
}
static void client_destroy(struct connection *conn)
{
struct quota_client *client = (struct quota_client *)conn;
e_debug(client->event, "Client disconnected");
connection_deinit(&client->conn);
client_reset(client);
event_unref(&client->event);
i_free(client);
master_service_client_connection_destroyed(master_service);
}
static struct connection_settings client_set = {
.input_max_size = SIZE_MAX,
.output_max_size = SIZE_MAX,
.client = FALSE
};
static const struct connection_vfuncs client_vfuncs = {
.destroy = client_destroy,
.input_line = client_input_line
};
static void main_preinit(void)
{
restrict_access_by_env(RESTRICT_ACCESS_FLAG_ALLOW_ROOT, NULL);
restrict_access_allow_coredumps(TRUE);
}
static void main_init(void)
{
static const struct setting_parser_info *set_roots[] = {
"a_status_setting_parser_info,
NULL
};
struct mail_storage_service_input input;
const struct setting_parser_info *user_info;
const struct setting_parser_context *set_parser;
const struct mail_user_settings *user_set;
const struct quota_status_settings *set;
const char *value, *error;
pool_t pool;
clients = connection_list_init(&client_set, &client_vfuncs);
storage_service = mail_storage_service_init(master_service, set_roots,
MAIL_STORAGE_SERVICE_FLAG_ALLOW_ROOT |
MAIL_STORAGE_SERVICE_FLAG_USERDB_LOOKUP |
MAIL_STORAGE_SERVICE_FLAG_TEMP_PRIV_DROP |
MAIL_STORAGE_SERVICE_FLAG_ENABLE_CORE_DUMPS |
MAIL_STORAGE_SERVICE_FLAG_NO_CHDIR);
i_zero(&input);
input.service = "quota-status";
input.module = "mail";
input.username = "";
quota_status_pool = pool_alloconly_create("quota status settings", 512);
pool = pool_alloconly_create("service all settings", 4096);
if (mail_storage_service_read_settings(storage_service, &input, pool,
&user_info, &set_parser,
&error) < 0)
i_fatal("%s", error);
user_set = master_service_settings_parser_get_others(master_service,
set_parser)[0];
set = master_service_settings_get_others(master_service)[1];
quota_status_settings = settings_dup("a_status_setting_parser_info, set,
quota_status_pool);
value = mail_user_set_plugin_getenv(user_set, "quota_status_nouser");
nouser_reply = p_strdup(quota_status_pool,
value != NULL ? value : "REJECT Unknown user");
pool_unref(&pool);
}
static void main_deinit(void)
{
pool_unref("a_status_pool);
connection_list_deinit(&clients);
mail_storage_service_deinit(&storage_service);
}
int main(int argc, char *argv[])
{
enum master_service_flags service_flags =
MASTER_SERVICE_FLAG_KEEP_CONFIG_OPEN;
int c;
protocol = QUOTA_PROTOCOL_UNKNOWN;
master_service = master_service_init("quota-status", service_flags,
&argc, &argv, "p:");
while ((c = master_getopt(master_service)) > 0) {
switch (c) {
case 'p':
if (strcmp(optarg, "postfix") == 0)
protocol = QUOTA_PROTOCOL_POSTFIX;
else
i_fatal("Unknown -p parameter: '%s'", optarg);
break;
default:
return FATAL_DEFAULT;
}
}
if (protocol == QUOTA_PROTOCOL_UNKNOWN)
i_fatal("Missing -p parameter");
master_service_init_log(master_service);
main_preinit();
main_init();
master_service_init_finish(master_service);
master_service_run(master_service, client_connected);
main_deinit();
master_service_deinit(&master_service);
return 0;
}
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