/
client-connection-tcp.c
715 lines (623 loc) · 19 KB
/
client-connection-tcp.c
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/* Copyright (c) 2010-2017 Dovecot authors, see the included COPYING file */
#include "lib.h"
#include "lib-signals.h"
#include "str.h"
#include "base64.h"
#include "ioloop.h"
#include "istream.h"
#include "ostream.h"
#include "strescape.h"
#include "process-title.h"
#include "settings-parser.h"
#include "iostream-ssl.h"
#include "ostream-multiplex.h"
#include "master-service.h"
#include "master-service-ssl.h"
#include "master-service-settings.h"
#include "mail-storage-service.h"
#include "doveadm-util.h"
#include "doveadm-server.h"
#include "doveadm-mail.h"
#include "doveadm-print.h"
#include "doveadm-settings.h"
#include "client-connection-private.h"
#include <unistd.h>
#define MAX_INBUF_SIZE (1024*1024)
static void client_connection_input(struct client_connection *conn);
static failure_callback_t *orig_error_callback, *orig_fatal_callback;
static failure_callback_t *orig_info_callback, *orig_debug_callback = NULL;
static bool log_recursing = FALSE;
static void ATTR_FORMAT(2, 0)
doveadm_server_log_handler(const struct failure_context *ctx,
const char *format, va_list args)
{
if (!log_recursing && doveadm_client != NULL &&
doveadm_client->log_out != NULL) T_BEGIN {
/* prevent re-entering this code if
any of the following code causes logging */
log_recursing = TRUE;
char c = doveadm_log_type_to_char(ctx->type);
const char *ptr,*start;
bool corked = o_stream_is_corked(doveadm_client->log_out);
va_list va;
va_copy(va, args);
string_t *str = t_str_new(128);
str_vprintfa(str, format, va);
va_end(va);
start = str_c(str);
if (!corked)
o_stream_cork(doveadm_client->log_out);
while((ptr = strchr(start, '\n'))!=NULL) {
o_stream_nsend(doveadm_client->log_out, &c, 1);
o_stream_nsend(doveadm_client->log_out, start, ptr-start+1);
str_delete(str, 0, ptr-start+1);
}
if (str->used > 0) {
o_stream_nsend(doveadm_client->log_out, &c, 1);
o_stream_nsend(doveadm_client->log_out, str->data, str->used);
o_stream_nsend(doveadm_client->log_out, "\n", 1);
}
o_stream_uncork(doveadm_client->log_out);
if (corked)
o_stream_cork(doveadm_client->log_out);
log_recursing = FALSE;
} T_END;
switch(ctx->type) {
case LOG_TYPE_DEBUG:
orig_debug_callback(ctx, format, args);
break;
case LOG_TYPE_INFO:
orig_info_callback(ctx, format, args);
break;
case LOG_TYPE_WARNING:
case LOG_TYPE_ERROR:
orig_error_callback(ctx, format, args);
break;
default:
i_unreached();
}
}
static void doveadm_server_capture_logs(void)
{
i_assert(orig_debug_callback == NULL);
i_get_failure_handlers(&orig_fatal_callback, &orig_error_callback,
&orig_info_callback, &orig_debug_callback);
i_set_error_handler(doveadm_server_log_handler);
i_set_info_handler(doveadm_server_log_handler);
i_set_debug_handler(doveadm_server_log_handler);
}
static void doveadm_server_restore_logs(void)
{
i_assert(orig_debug_callback != NULL);
i_set_error_handler(orig_error_callback);
i_set_info_handler(orig_info_callback);
i_set_debug_handler(orig_debug_callback);
orig_fatal_callback = NULL;
orig_error_callback = NULL;
orig_info_callback = NULL;
orig_debug_callback = NULL;
}
static void
doveadm_cmd_server_post(struct client_connection *conn, const char *cmd_name)
{
const char *str = NULL;
if (doveadm_exit_code == 0) {
o_stream_nsend(conn->output, "\n+\n", 3);
return;
}
str = doveadm_exit_code_to_str(doveadm_exit_code);
if (str != NULL) {
o_stream_nsend_str(conn->output,
t_strdup_printf("\n-%s\n", str));
} else {
o_stream_nsend_str(conn->output, "\n-\n");
i_error("BUG: Command '%s' returned unknown error code %d",
cmd_name, doveadm_exit_code);
}
}
static void
doveadm_cmd_server_run_ver2(struct client_connection *conn,
int argc, const char *const argv[],
struct doveadm_cmd_context *cctx)
{
i_getopt_reset();
if (doveadm_cmd_run_ver2(argc, argv, cctx) < 0)
doveadm_exit_code = EX_USAGE;
doveadm_cmd_server_post(conn, cctx->cmd->name);
}
static void
doveadm_cmd_server_run(struct client_connection *conn,
int argc, const char *const argv[],
const struct doveadm_cmd *cmd)
{
i_getopt_reset();
cmd->cmd(argc, (char **)argv);
doveadm_cmd_server_post(conn, cmd->name);
}
static int
doveadm_mail_cmd_server_parse(const struct doveadm_mail_cmd *cmd,
const struct doveadm_settings *set,
int argc, const char *const argv[],
struct doveadm_cmd_context *cctx,
struct doveadm_mail_cmd_context **mctx_r)
{
struct doveadm_mail_cmd_context *mctx;
const char *getopt_args;
bool add_username_header = FALSE;
int c;
mctx = doveadm_mail_cmd_init(cmd, set);
mctx->cctx = cctx;
mctx->full_args = argv+1;
mctx->proxying = TRUE;
mctx->service_flags |=
MAIL_STORAGE_SERVICE_FLAG_NO_LOG_INIT |
MAIL_STORAGE_SERVICE_FLAG_USERDB_LOOKUP;
if (doveadm_debug)
mctx->service_flags |= MAIL_STORAGE_SERVICE_FLAG_DEBUG;
i_getopt_reset();
getopt_args = t_strconcat("AF:S:u:", mctx->getopt_args, NULL);
while ((c = getopt(argc, (char **)argv, getopt_args)) > 0) {
switch (c) {
case 'A':
case 'F':
add_username_header = TRUE;
break;
case 'S':
/* ignore */
break;
case 'u':
if (strchr(optarg, '*') != NULL ||
strchr(optarg, '?') != NULL)
add_username_header = TRUE;
break;
default:
if ((mctx->v.parse_arg == NULL ||
!mctx->v.parse_arg(mctx, c))) {
i_error("doveadm %s: "
"Client sent unknown parameter: %c",
cmd->name, c);
mctx->v.deinit(mctx);
pool_unref(&mctx->pool);
return -1;
}
}
}
if (argv[optind] != NULL && cmd->usage_args == NULL) {
i_error("doveadm %s: Client sent unknown parameter: %s",
cmd->name, argv[optind]);
mctx->v.deinit(mctx);
pool_unref(&mctx->pool);
return -1;
}
mctx->args = argv+optind;
if (cctx->username != NULL) {
if (strchr(cctx->username, '*') != NULL ||
strchr(cctx->username, '?') != NULL) {
add_username_header = TRUE;
}
}
if (doveadm_print_is_initialized() && add_username_header) {
doveadm_print_header("username", "Username",
DOVEADM_PRINT_HEADER_FLAG_STICKY |
DOVEADM_PRINT_HEADER_FLAG_HIDE_TITLE);
doveadm_print_sticky("username", cctx->username);
}
*mctx_r = mctx;
return 0;
}
static void
doveadm_mail_cmd_server_run(struct client_connection *conn,
struct doveadm_mail_cmd_context *mctx)
{
const char *error;
int ret;
o_stream_cork(conn->output);
if (mctx->v.preinit != NULL)
mctx->v.preinit(mctx);
ret = doveadm_mail_single_user(mctx, &error);
doveadm_mail_server_flush();
mctx->v.deinit(mctx);
doveadm_print_flush();
mail_storage_service_deinit(&mctx->storage_service);
if (ret < 0) {
i_error("%s: %s", mctx->cmd->name, error);
o_stream_nsend(conn->output, "\n-\n", 3);
} else if (ret == 0) {
o_stream_nsend_str(conn->output, "\n-NOUSER\n");
} else if (mctx->exit_code != 0) {
/* maybe not an error, but not a full success either */
o_stream_nsend_str(conn->output,
t_strdup_printf("\n-%u\n", mctx->exit_code));
} else {
o_stream_nsend(conn->output, "\n+\n", 3);
}
o_stream_uncork(conn->output);
pool_unref(&mctx->pool);
}
bool doveadm_client_is_allowed_command(const struct doveadm_settings *set,
const char *cmd_name)
{
bool ret = FALSE;
if (*set->doveadm_allowed_commands == '\0')
return TRUE;
T_BEGIN {
const char *const *cmds =
t_strsplit(set->doveadm_allowed_commands, ",");
for (; *cmds != NULL; cmds++) {
if (strcmp(*cmds, cmd_name) == 0) {
ret = TRUE;
break;
}
}
} T_END;
return ret;
}
static int doveadm_cmd_handle(struct client_connection *conn,
const char *cmd_name,
int argc, const char *const argv[],
struct doveadm_cmd_context *cctx)
{
struct ioloop *ioloop, *prev_ioloop = current_ioloop;
const struct doveadm_cmd *cmd = NULL;
const struct doveadm_mail_cmd *mail_cmd;
struct doveadm_mail_cmd_context *mctx;
const struct doveadm_cmd_ver2 *cmd_ver2;
if ((cmd_ver2 = doveadm_cmd_find_with_args_ver2(cmd_name, &argc, &argv)) == NULL) {
mail_cmd = doveadm_mail_cmd_find(cmd_name);
if (mail_cmd == NULL) {
cmd = doveadm_cmd_find_with_args(cmd_name, &argc, &argv);
if (cmd == NULL) {
i_error("doveadm: Client sent unknown command: %s", cmd_name);
return -1;
}
} else {
if (doveadm_mail_cmd_server_parse(mail_cmd, conn->set,
argc, argv,
cctx, &mctx) < 0)
return -1;
}
} else {
cctx->cmd = cmd_ver2;
}
/* some commands will want to call io_loop_run(), but we're already
running one and we can't call the original one recursively, so
create a new ioloop. */
ioloop = io_loop_create();
if (cmd_ver2 != NULL)
doveadm_cmd_server_run_ver2(conn, argc, argv, cctx);
else if (cmd != NULL)
doveadm_cmd_server_run(conn, argc, argv, cmd);
else
doveadm_mail_cmd_server_run(conn, mctx);
io_loop_set_current(prev_ioloop);
o_stream_switch_ioloop(conn->output);
if (conn->log_out != NULL)
o_stream_switch_ioloop(conn->log_out);
io_loop_set_current(ioloop);
io_loop_destroy(&ioloop);
/* clear all headers */
doveadm_print_deinit();
doveadm_print_init(DOVEADM_PRINT_TYPE_SERVER);
return doveadm_exit_code == 0 ? 0 : -1;
}
static bool client_handle_command(struct client_connection *conn,
const char *const *args)
{
struct doveadm_cmd_context cctx;
const char *flags, *cmd_name;
unsigned int argc = str_array_length(args);
if (argc < 3) {
i_error("doveadm client: No command given");
return FALSE;
}
i_zero(&cctx);
cctx.conn_type = conn->type;
cctx.input = conn->input;
cctx.output = conn->output;
cctx.local_ip = conn->local_ip;
cctx.remote_ip = conn->remote_ip;
cctx.local_port = conn->local_port;
cctx.remote_port = conn->remote_port;
doveadm_exit_code = 0;
flags = args[0];
cctx.username = args[1];
cmd_name = args[2];
doveadm_debug = FALSE;
doveadm_verbose = FALSE;
for (; *flags != '\0'; flags++) {
switch (*flags) {
case 'D':
doveadm_debug = TRUE;
doveadm_verbose = TRUE;
break;
case 'v':
doveadm_verbose = TRUE;
break;
default:
i_error("doveadm client: Unknown flag: %c", *flags);
return FALSE;
}
}
if (!doveadm_client_is_allowed_command(conn->set, cmd_name)) {
i_error("doveadm client isn't allowed to use command: %s",
cmd_name);
return FALSE;
}
client_connection_set_proctitle(conn, cmd_name);
o_stream_cork(conn->output);
if (doveadm_cmd_handle(conn, cmd_name, argc-2, args+2, &cctx) < 0)
o_stream_nsend(conn->output, "\n-\n", 3);
o_stream_uncork(conn->output);
client_connection_set_proctitle(conn, "");
/* flush the output and possibly run next command */
net_set_nonblock(conn->fd, FALSE);
(void)o_stream_flush(conn->output);
net_set_nonblock(conn->fd, TRUE);
return TRUE;
}
static int
client_connection_authenticate(struct client_connection *conn)
{
const char *line, *pass;
buffer_t *plain;
const unsigned char *data;
size_t size;
if ((line = i_stream_read_next_line(conn->input)) == NULL) {
if (conn->input->eof)
return -1;
return 0;
}
if (*conn->set->doveadm_password == '\0') {
i_error("doveadm_password not set, "
"remote authentication disabled");
return -1;
}
/* FIXME: some day we should probably let auth process do this and
support all kinds of authentication */
if (strncmp(line, "PLAIN\t", 6) != 0) {
i_error("doveadm client attempted non-PLAIN authentication: %s", line);
return -1;
}
plain = buffer_create_dynamic(pool_datastack_create(), 128);
if (base64_decode(line + 6, strlen(line + 6), NULL, plain) < 0) {
i_error("doveadm client sent invalid base64 auth PLAIN data");
return -1;
}
data = plain->data;
size = plain->used;
if (size < 10 || data[0] != '\0' ||
memcmp(data+1, "doveadm", 7) != 0 || data[8] != '\0') {
i_error("doveadm client didn't authenticate as 'doveadm'");
return -1;
}
pass = t_strndup(data + 9, size - 9);
if (strlen(pass) != strlen(conn->set->doveadm_password) ||
!mem_equals_timing_safe(pass, conn->set->doveadm_password,
strlen(pass))) {
i_error("doveadm client authenticated with wrong password");
return -1;
}
return 1;
}
static void client_log_disconnect_error(struct client_connection *conn)
{
const char *error;
error = conn->ssl_iostream == NULL ? NULL :
ssl_iostream_get_last_error(conn->ssl_iostream);
if (error == NULL) {
error = conn->input->stream_errno == 0 ? "EOF" :
strerror(conn->input->stream_errno);
}
i_error("doveadm client disconnected before handshake: %s", error);
}
static void client_connection_input(struct client_connection *conn)
{
const char *line;
bool ok = TRUE;
int ret;
unsigned int minor;
if (!conn->handshaked) {
if ((line = i_stream_read_next_line(conn->input)) == NULL) {
if (conn->input->eof || conn->input->stream_errno != 0) {
client_log_disconnect_error(conn);
client_connection_destroy(&conn);
}
return;
}
if (!version_string_verify_full(line, "doveadm-server",
DOVEADM_SERVER_PROTOCOL_VERSION_MAJOR, &minor)) {
i_error("doveadm client not compatible with this server "
"(mixed old and new binaries?)");
client_connection_destroy(&conn);
return;
}
if (minor > 0) {
/* send version reply */
o_stream_nsend_str(conn->output,
DOVEADM_CLIENT_PROTOCOL_VERSION_LINE"\n");
conn->use_multiplex = TRUE;
}
conn->handshaked = TRUE;
}
if (!conn->authenticated) {
if ((ret = client_connection_authenticate(conn)) <= 0) {
if (ret < 0) {
o_stream_nsend(conn->output, "-\n", 2);
client_connection_destroy(&conn);
}
return;
}
o_stream_nsend(conn->output, "+\n", 2);
conn->authenticated = TRUE;
}
if (!conn->io_setup) {
conn->io_setup = TRUE;
if (conn->use_multiplex) {
struct ostream *os = conn->output;
conn->output = o_stream_create_multiplex(os, (size_t)-1);
o_stream_set_name(conn->output, o_stream_get_name(os));
o_stream_set_no_error_handling(conn->output, TRUE);
o_stream_unref(&os);
conn->log_out =
o_stream_multiplex_add_channel(conn->output,
DOVEADM_LOG_CHANNEL_ID);
o_stream_set_no_error_handling(conn->log_out, TRUE);
o_stream_set_name(conn->log_out, t_strdup_printf("%s (log)",
o_stream_get_name(conn->output)));
doveadm_server_capture_logs();
}
doveadm_print_ostream = conn->output;
}
while (ok && !conn->input->closed &&
(line = i_stream_read_next_line(conn->input)) != NULL) {
T_BEGIN {
const char *const *args;
args = t_strsplit_tabescaped(line);
ok = client_handle_command(conn, args);
} T_END;
}
if (conn->input->eof || conn->input->stream_errno != 0 || !ok)
client_connection_destroy(&conn);
}
static int client_connection_read_settings(struct client_connection *conn)
{
const struct setting_parser_info *set_roots[] = {
&doveadm_setting_parser_info,
NULL
};
struct master_service_settings_input input;
struct master_service_settings_output output;
const char *error;
void *set;
i_zero(&input);
input.roots = set_roots;
input.service = "doveadm";
input.local_ip = conn->local_ip;
input.remote_ip = conn->remote_ip;
if (master_service_settings_read(master_service, &input,
&output, &error) < 0) {
i_error("Error reading configuration: %s", error);
return -1;
}
set = master_service_settings_get_others(master_service)[0];
conn->set = settings_dup(&doveadm_setting_parser_info, set, conn->pool);
return 0;
}
static int client_connection_init_ssl(struct client_connection *conn)
{
const char *error;
if (master_service_ssl_init(master_service,
&conn->input, &conn->output,
&conn->ssl_iostream, &error) < 0) {
i_error("SSL init failed: %s", error);
return -1;
}
if (ssl_iostream_handshake(conn->ssl_iostream) < 0) {
i_error("SSL handshake failed: %s",
ssl_iostream_get_last_error(conn->ssl_iostream));
return -1;
}
return 0;
}
static void
client_connection_send_auth_handshake(struct client_connection *
conn, int listen_fd)
{
const char *listen_path;
struct stat st;
/* we'll have to do this with stat(), because at least in Linux
fstat() always returns mode as 0777 */
if (net_getunixname(listen_fd, &listen_path) == 0 &&
stat(listen_path, &st) == 0 && S_ISSOCK(st.st_mode) &&
(st.st_mode & 0777) == 0600) {
/* no need for client to authenticate */
conn->authenticated = TRUE;
o_stream_nsend(conn->output, "+\n", 2);
} else {
o_stream_nsend(conn->output, "-\n", 2);
}
}
int client_connection_init(struct client_connection *conn,
enum client_connection_type type, int fd)
{
const char *ip;
i_assert(type != CLIENT_CONNECTION_TYPE_CLI);
conn->fd = fd;
conn->type = type;
(void)net_getsockname(fd, &conn->local_ip, &conn->local_port);
(void)net_getpeername(fd, &conn->remote_ip, &conn->remote_port);
ip = net_ip2addr(&conn->remote_ip);
if (ip[0] != '\0')
i_set_failure_prefix("doveadm(%s): ", ip);
if (client_connection_read_settings(conn) < 0) {
client_connection_destroy(&conn);
return -1;
}
return 0;
}
struct client_connection *
client_connection_create(int fd, int listen_fd, bool ssl)
{
struct client_connection *conn;
pool_t pool;
pool = pool_alloconly_create("doveadm client", 1024*16);
conn = p_new(pool, struct client_connection, 1);
conn->pool = pool;
if (client_connection_init(conn,
CLIENT_CONNECTION_TYPE_TCP, fd) < 0)
return NULL;
doveadm_print_init(DOVEADM_PRINT_TYPE_SERVER);
conn->name = conn->remote_ip.family == 0 ? "<local>" :
p_strdup(pool, net_ip2addr(&conn->remote_ip));
conn->io = io_add(fd, IO_READ, client_connection_input, conn);
conn->input = i_stream_create_fd(fd, MAX_INBUF_SIZE);
conn->output = o_stream_create_fd(fd, (size_t)-1);
i_stream_set_name(conn->input, conn->name);
o_stream_set_name(conn->output, conn->name);
o_stream_set_no_error_handling(conn->output, TRUE);
if (ssl) {
if (client_connection_init_ssl(conn) < 0) {
client_connection_destroy(&conn);
return NULL;
}
}
client_connection_send_auth_handshake(conn, listen_fd);
client_connection_set_proctitle(conn, "");
return conn;
}
void client_connection_destroy(struct client_connection **_conn)
{
struct client_connection *conn = *_conn;
*_conn = NULL;
doveadm_print_deinit();
if (conn->http)
client_connection_destroy_http(conn);
if (conn->ssl_iostream != NULL)
ssl_iostream_destroy(&conn->ssl_iostream);
o_stream_destroy(&conn->output);
io_remove(&conn->io);
if (conn->log_out != NULL) {
doveadm_server_restore_logs();
o_stream_unref(&conn->log_out);
}
i_stream_destroy(&conn->input);
i_close_fd(&conn->fd);
pool_unref(&conn->pool);
doveadm_print_ostream = NULL;
doveadm_client = NULL;
master_service_client_connection_destroyed(master_service);
if (doveadm_verbose_proctitle)
process_title_set("[idling]");
}
void client_connection_set_proctitle(struct client_connection *conn,
const char *text)
{
const char *str;
if (!doveadm_verbose_proctitle)
return;
if (text[0] == '\0')
str = t_strdup_printf("[%s]", conn->name);
else
str = t_strdup_printf("[%s %s]", conn->name, text);
process_title_set(str);
}