mirror of
https://git.tartarus.org/simon/putty.git
synced 2025-01-10 01:48:00 +00:00
d42f1fe96d
It was totally unused. No implementation of the 'closing' method in a
Plug vtable was checking it for any reason at all, except for
ProxySocket which captured it from its client in order to pass on to
its server (which, perhaps after further iterations of ProxySocket,
would have ended up ignoring it similarly). And every caller of
plug_closing set it to 0 (aka false), except for the one in sshproxy.c
which passed true (but it would have made no difference to anyone).
The comment in network.h refers to a FIXME comment which was in
try_send() when that code was written (see winnet.c in commit
7b0e082700). That FIXME is long gone, replaced by a use of a
toplevel callback. So I think the aim must have been to avoid
re-entrancy when sk_write called try_send which encountered a socket
error and called back to plug_closing - but that's long since fixed by
other means now.
603 lines
19 KiB
C
603 lines
19 KiB
C
/*
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* Top-level code for SSH server implementation.
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*/
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#include <assert.h>
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#include <stddef.h>
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#include "putty.h"
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#include "ssh.h"
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#include "bpp.h"
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#include "ppl.h"
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#include "channel.h"
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#include "server.h"
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#ifndef NO_GSSAPI
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#include "gssc.h"
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#include "gss.h"
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#endif
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struct Ssh { int dummy; };
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typedef struct server server;
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struct server {
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bufchain in_raw, out_raw;
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IdempotentCallback ic_out_raw;
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bool pending_close;
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bufchain dummy_user_input; /* we never put anything on this */
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PacketLogSettings pls;
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LogContext *logctx;
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struct DataTransferStats stats;
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int remote_bugs;
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Socket *socket;
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Plug plug;
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int conn_throttle_count;
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bool frozen;
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Conf *conf;
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const SshServerConfig *ssc;
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ssh_key *const *hostkeys;
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int nhostkeys;
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RSAKey *hostkey1;
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AuthPolicy *authpolicy;
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LogPolicy *logpolicy;
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const SftpServerVtable *sftpserver_vt;
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agentfwd *stunt_agentfwd;
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Seat seat;
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Ssh ssh;
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struct ssh_version_receiver version_receiver;
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BinaryPacketProtocol *bpp;
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PacketProtocolLayer *base_layer;
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ConnectionLayer *cl;
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#ifndef NO_GSSAPI
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struct ssh_connection_shared_gss_state gss_state;
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#endif
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};
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static void ssh_server_free_callback(void *vsrv);
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static void server_got_ssh_version(struct ssh_version_receiver *rcv,
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int major_version);
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static void server_connect_bpp(server *srv);
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static void server_bpp_output_raw_data_callback(void *vctx);
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void share_activate(ssh_sharing_state *sharestate,
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const char *server_verstring) {}
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void ssh_connshare_provide_connlayer(ssh_sharing_state *sharestate,
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ConnectionLayer *cl) {}
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int share_ndownstreams(ssh_sharing_state *sharestate) { return 0; }
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void share_got_pkt_from_server(ssh_sharing_connstate *cs, int type,
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const void *vpkt, int pktlen) {}
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void share_setup_x11_channel(ssh_sharing_connstate *cs, share_channel *chan,
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unsigned upstream_id, unsigned server_id,
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unsigned server_currwin, unsigned server_maxpkt,
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unsigned client_adjusted_window,
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const char *peer_addr, int peer_port, int endian,
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int protomajor, int protominor,
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const void *initial_data, int initial_len) {}
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Channel *agentf_new(SshChannel *c) { return NULL; }
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bool agent_exists(void) { return false; }
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void ssh_got_exitcode(Ssh *ssh, int exitcode) {}
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void ssh_check_frozen(Ssh *ssh) {}
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mainchan *mainchan_new(
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PacketProtocolLayer *ppl, ConnectionLayer *cl, Conf *conf,
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int term_width, int term_height, bool is_simple, SshChannel **sc_out)
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{ return NULL; }
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void mainchan_get_specials(
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mainchan *mc, add_special_fn_t add_special, void *ctx) {}
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void mainchan_special_cmd(mainchan *mc, SessionSpecialCode code, int arg) {}
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void mainchan_terminal_size(mainchan *mc, int width, int height) {}
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/* Seat functions to ensure we don't get choosy about crypto - as the
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* server, it's not up to us to give user warnings */
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static int server_confirm_weak_crypto_primitive(
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Seat *seat, const char *algtype, const char *algname,
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void (*callback)(void *ctx, int result), void *ctx) { return 1; }
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static int server_confirm_weak_cached_hostkey(
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Seat *seat, const char *algname, const char *betteralgs,
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void (*callback)(void *ctx, int result), void *ctx) { return 1; }
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static const SeatVtable server_seat_vt = {
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.output = nullseat_output,
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.eof = nullseat_eof,
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.sent = nullseat_sent,
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.get_userpass_input = nullseat_get_userpass_input,
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.notify_session_started = nullseat_notify_session_started,
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.notify_remote_exit = nullseat_notify_remote_exit,
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.notify_remote_disconnect = nullseat_notify_remote_disconnect,
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.connection_fatal = nullseat_connection_fatal,
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.update_specials_menu = nullseat_update_specials_menu,
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.get_ttymode = nullseat_get_ttymode,
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.set_busy_status = nullseat_set_busy_status,
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.verify_ssh_host_key = nullseat_verify_ssh_host_key,
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.confirm_weak_crypto_primitive = server_confirm_weak_crypto_primitive,
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.confirm_weak_cached_hostkey = server_confirm_weak_cached_hostkey,
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.is_utf8 = nullseat_is_never_utf8,
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.echoedit_update = nullseat_echoedit_update,
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.get_x_display = nullseat_get_x_display,
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.get_windowid = nullseat_get_windowid,
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.get_window_pixel_size = nullseat_get_window_pixel_size,
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.stripctrl_new = nullseat_stripctrl_new,
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.set_trust_status = nullseat_set_trust_status,
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.can_set_trust_status = nullseat_can_set_trust_status_no,
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.verbose = nullseat_verbose_no,
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.interactive = nullseat_interactive_no,
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.get_cursor_position = nullseat_get_cursor_position,
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};
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static void server_socket_log(Plug *plug, PlugLogType type, SockAddr *addr,
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int port, const char *error_msg, int error_code)
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{
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/* server *srv = container_of(plug, server, plug); */
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/* FIXME */
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}
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static void server_closing(Plug *plug, const char *error_msg, int error_code)
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{
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server *srv = container_of(plug, server, plug);
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if (error_msg) {
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ssh_remote_error(&srv->ssh, "%s", error_msg);
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} else if (srv->bpp) {
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srv->bpp->input_eof = true;
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queue_idempotent_callback(&srv->bpp->ic_in_raw);
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}
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}
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static void server_receive(
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Plug *plug, int urgent, const char *data, size_t len)
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{
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server *srv = container_of(plug, server, plug);
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/* Log raw data, if we're in that mode. */
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if (srv->logctx)
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log_packet(srv->logctx, PKT_INCOMING, -1, NULL, data, len,
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0, NULL, NULL, 0, NULL);
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bufchain_add(&srv->in_raw, data, len);
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if (!srv->frozen && srv->bpp)
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queue_idempotent_callback(&srv->bpp->ic_in_raw);
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}
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static void server_sent(Plug *plug, size_t bufsize)
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{
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#ifdef FIXME
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server *srv = container_of(plug, server, plug);
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/*
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* If the send backlog on the SSH socket itself clears, we should
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* unthrottle the whole world if it was throttled. Also trigger an
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* extra call to the consumer of the BPP's output, to try to send
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* some more data off its bufchain.
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*/
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if (bufsize < SSH_MAX_BACKLOG) {
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srv_throttle_all(srv, 0, bufsize);
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queue_idempotent_callback(&srv->ic_out_raw);
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}
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#endif
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}
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LogContext *ssh_get_logctx(Ssh *ssh)
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{
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server *srv = container_of(ssh, server, ssh);
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return srv->logctx;
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}
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void ssh_sendbuffer_changed(Ssh *ssh)
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{
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}
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void ssh_throttle_conn(Ssh *ssh, int adjust)
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{
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server *srv = container_of(ssh, server, ssh);
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int old_count = srv->conn_throttle_count;
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bool frozen;
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srv->conn_throttle_count += adjust;
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assert(srv->conn_throttle_count >= 0);
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if (srv->conn_throttle_count && !old_count) {
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frozen = true;
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} else if (!srv->conn_throttle_count && old_count) {
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frozen = false;
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} else {
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return; /* don't change current frozen state */
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}
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srv->frozen = frozen;
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if (srv->socket) {
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sk_set_frozen(srv->socket, frozen);
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/*
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* Now process any SSH connection data that was stashed in our
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* queue while we were frozen.
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*/
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queue_idempotent_callback(&srv->bpp->ic_in_raw);
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}
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}
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void ssh_conn_processed_data(Ssh *ssh)
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{
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/* FIXME: we could add the same check_frozen_state system as we
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* have in ssh.c, but because that was originally added to work
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* around a peculiarity of the GUI event loop, I haven't yet. */
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}
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Conf *make_ssh_server_conf(void)
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{
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Conf *conf = conf_new();
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load_open_settings(NULL, conf);
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/* In Uppity, we support even the legacy des-cbc cipher by
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* default, so that it will be available if the user forces it by
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* overriding the KEXINIT strings. If the user wants it _not_
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* supported, of course, they can override KEXINIT in the other
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* direction. */
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conf_set_bool(conf, CONF_ssh2_des_cbc, true);
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return conf;
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}
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void ssh_check_sendok(Ssh *ssh) {}
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static const PlugVtable ssh_server_plugvt = {
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.log = server_socket_log,
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.closing = server_closing,
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.receive = server_receive,
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.sent = server_sent,
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};
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Plug *ssh_server_plug(
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Conf *conf, const SshServerConfig *ssc,
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ssh_key *const *hostkeys, int nhostkeys,
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RSAKey *hostkey1, AuthPolicy *authpolicy, LogPolicy *logpolicy,
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const SftpServerVtable *sftpserver_vt)
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{
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server *srv = snew(server);
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memset(srv, 0, sizeof(server));
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srv->plug.vt = &ssh_server_plugvt;
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srv->conf = conf_copy(conf);
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srv->ssc = ssc;
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srv->logctx = log_init(logpolicy, conf);
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conf_set_bool(srv->conf, CONF_ssh_no_shell, true);
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srv->nhostkeys = nhostkeys;
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srv->hostkeys = hostkeys;
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srv->hostkey1 = hostkey1;
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srv->authpolicy = authpolicy;
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srv->logpolicy = logpolicy;
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srv->sftpserver_vt = sftpserver_vt;
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srv->seat.vt = &server_seat_vt;
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bufchain_init(&srv->in_raw);
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bufchain_init(&srv->out_raw);
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bufchain_init(&srv->dummy_user_input);
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#ifndef NO_GSSAPI
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/* FIXME: replace with sensible */
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srv->gss_state.libs = snew(struct ssh_gss_liblist);
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srv->gss_state.libs->nlibraries = 0;
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#endif
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return &srv->plug;
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}
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void ssh_server_start(Plug *plug, Socket *socket)
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{
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server *srv = container_of(plug, server, plug);
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const char *our_protoversion;
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if (srv->ssc->bare_connection) {
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our_protoversion = "2.0"; /* SSH-2 only */
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} else if (srv->hostkey1 && srv->nhostkeys) {
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our_protoversion = "1.99"; /* offer both SSH-1 and SSH-2 */
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} else if (srv->hostkey1) {
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our_protoversion = "1.5"; /* SSH-1 only */
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} else {
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assert(srv->nhostkeys);
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our_protoversion = "2.0"; /* SSH-2 only */
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}
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srv->socket = socket;
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srv->ic_out_raw.fn = server_bpp_output_raw_data_callback;
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srv->ic_out_raw.ctx = srv;
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srv->version_receiver.got_ssh_version = server_got_ssh_version;
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srv->bpp = ssh_verstring_new(
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srv->conf, srv->logctx, srv->ssc->bare_connection,
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our_protoversion, &srv->version_receiver,
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true, srv->ssc->application_name);
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server_connect_bpp(srv);
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queue_idempotent_callback(&srv->bpp->ic_in_raw);
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}
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static void ssh_server_free_callback(void *vsrv)
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{
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server *srv = (server *)vsrv;
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logeventf(srv->logctx, "freeing server instance");
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bufchain_clear(&srv->in_raw);
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bufchain_clear(&srv->out_raw);
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bufchain_clear(&srv->dummy_user_input);
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if (srv->socket)
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sk_close(srv->socket);
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if (srv->stunt_agentfwd)
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agentfwd_free(srv->stunt_agentfwd);
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if (srv->base_layer)
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ssh_ppl_free(srv->base_layer);
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if (srv->bpp)
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ssh_bpp_free(srv->bpp);
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delete_callbacks_for_context(srv);
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conf_free(srv->conf);
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log_free(srv->logctx);
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#ifndef NO_GSSAPI
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sfree(srv->gss_state.libs); /* FIXME: replace with sensible */
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#endif
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LogPolicy *lp = srv->logpolicy;
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sfree(srv);
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server_instance_terminated(lp);
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}
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static void server_connect_bpp(server *srv)
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{
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srv->bpp->ssh = &srv->ssh;
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srv->bpp->in_raw = &srv->in_raw;
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srv->bpp->out_raw = &srv->out_raw;
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bufchain_set_callback(srv->bpp->out_raw, &srv->ic_out_raw);
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srv->bpp->pls = &srv->pls;
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srv->bpp->logctx = srv->logctx;
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srv->bpp->remote_bugs = srv->remote_bugs;
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/* Servers don't really have a notion of 'unexpected' connection
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* closure. The client is free to close if it likes. */
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srv->bpp->expect_close = true;
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}
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static void server_connect_ppl(server *srv, PacketProtocolLayer *ppl)
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{
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ppl->bpp = srv->bpp;
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ppl->logctx = srv->logctx;
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ppl->ssh = &srv->ssh;
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ppl->seat = &srv->seat;
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ppl->remote_bugs = srv->remote_bugs;
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}
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static void server_bpp_output_raw_data_callback(void *vctx)
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{
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server *srv = (server *)vctx;
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if (!srv->socket)
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return;
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while (bufchain_size(&srv->out_raw) > 0) {
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size_t backlog;
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ptrlen data = bufchain_prefix(&srv->out_raw);
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if (srv->logctx)
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log_packet(srv->logctx, PKT_OUTGOING, -1, NULL, data.ptr, data.len,
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0, NULL, NULL, 0, NULL);
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backlog = sk_write(srv->socket, data.ptr, data.len);
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bufchain_consume(&srv->out_raw, data.len);
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if (backlog > SSH_MAX_BACKLOG) {
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#ifdef FIXME
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ssh_throttle_all(ssh, 1, backlog);
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#endif
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return;
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}
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}
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if (srv->pending_close) {
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sk_close(srv->socket);
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srv->socket = NULL;
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queue_toplevel_callback(ssh_server_free_callback, srv);
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}
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}
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static void server_shutdown_internal(server *srv)
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{
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/*
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* We only need to free the base PPL, which will free the others
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* (if any) transitively.
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*/
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if (srv->base_layer) {
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ssh_ppl_free(srv->base_layer);
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srv->base_layer = NULL;
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}
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srv->cl = NULL;
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}
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static void server_initiate_connection_close(server *srv)
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{
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/* Wind up everything above the BPP. */
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server_shutdown_internal(srv);
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/* Force any remaining queued SSH packets through the BPP, and
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* schedule closing the network socket after they go out. */
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ssh_bpp_handle_output(srv->bpp);
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srv->pending_close = true;
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queue_idempotent_callback(&srv->ic_out_raw);
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/* Now we expect the other end to close the connection too in
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* response, so arrange that we'll receive notification of that
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* via ssh_remote_eof. */
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srv->bpp->expect_close = true;
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}
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#define GET_FORMATTED_MSG(fmt) \
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char *msg; \
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va_list ap; \
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va_start(ap, fmt); \
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msg = dupvprintf(fmt, ap); \
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va_end(ap);
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#define LOG_FORMATTED_MSG(logctx, fmt) do \
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{ \
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va_list ap; \
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va_start(ap, fmt); \
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logeventvf(logctx, fmt, ap); \
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va_end(ap); \
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} while (0)
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void ssh_remote_error(Ssh *ssh, const char *fmt, ...)
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{
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server *srv = container_of(ssh, server, ssh);
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LOG_FORMATTED_MSG(srv->logctx, fmt);
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queue_toplevel_callback(ssh_server_free_callback, srv);
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}
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void ssh_remote_eof(Ssh *ssh, const char *fmt, ...)
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{
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server *srv = container_of(ssh, server, ssh);
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LOG_FORMATTED_MSG(srv->logctx, fmt);
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queue_toplevel_callback(ssh_server_free_callback, srv);
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}
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void ssh_proto_error(Ssh *ssh, const char *fmt, ...)
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{
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server *srv = container_of(ssh, server, ssh);
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if (srv->base_layer) {
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GET_FORMATTED_MSG(fmt);
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ssh_bpp_queue_disconnect(srv->bpp, msg,
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SSH2_DISCONNECT_PROTOCOL_ERROR);
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server_initiate_connection_close(srv);
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logeventf(srv->logctx, "Protocol error: %s", msg);
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sfree(msg);
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}
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}
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|
|
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void ssh_sw_abort(Ssh *ssh, const char *fmt, ...)
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|
{
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server *srv = container_of(ssh, server, ssh);
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LOG_FORMATTED_MSG(srv->logctx, fmt);
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queue_toplevel_callback(ssh_server_free_callback, srv);
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}
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|
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void ssh_user_close(Ssh *ssh, const char *fmt, ...)
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{
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server *srv = container_of(ssh, server, ssh);
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LOG_FORMATTED_MSG(srv->logctx, fmt);
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queue_toplevel_callback(ssh_server_free_callback, srv);
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}
|
|
|
|
static void server_got_ssh_version(struct ssh_version_receiver *rcv,
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|
int major_version)
|
|
{
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|
server *srv = container_of(rcv, server, version_receiver);
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BinaryPacketProtocol *old_bpp;
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PacketProtocolLayer *connection_layer;
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|
|
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old_bpp = srv->bpp;
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srv->remote_bugs = ssh_verstring_get_bugs(old_bpp);
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|
|
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if (srv->ssc->bare_connection) {
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|
srv->bpp = ssh2_bare_bpp_new(srv->logctx);
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server_connect_bpp(srv);
|
|
|
|
connection_layer = ssh2_connection_new(
|
|
&srv->ssh, NULL, false, srv->conf,
|
|
ssh_verstring_get_local(old_bpp), &srv->dummy_user_input,
|
|
&srv->cl);
|
|
ssh2connection_server_configure(connection_layer,
|
|
srv->sftpserver_vt, srv->ssc);
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|
server_connect_ppl(srv, connection_layer);
|
|
|
|
srv->base_layer = connection_layer;
|
|
} else if (major_version == 2) {
|
|
PacketProtocolLayer *userauth_layer, *transport_child_layer;
|
|
|
|
srv->bpp = ssh2_bpp_new(srv->logctx, &srv->stats, true);
|
|
server_connect_bpp(srv);
|
|
|
|
connection_layer = ssh2_connection_new(
|
|
&srv->ssh, NULL, false, srv->conf,
|
|
ssh_verstring_get_local(old_bpp), &srv->dummy_user_input,
|
|
&srv->cl);
|
|
ssh2connection_server_configure(connection_layer,
|
|
srv->sftpserver_vt, srv->ssc);
|
|
server_connect_ppl(srv, connection_layer);
|
|
|
|
if (conf_get_bool(srv->conf, CONF_ssh_no_userauth)) {
|
|
userauth_layer = NULL;
|
|
transport_child_layer = connection_layer;
|
|
} else {
|
|
userauth_layer = ssh2_userauth_server_new(
|
|
connection_layer, srv->authpolicy, srv->ssc);
|
|
server_connect_ppl(srv, userauth_layer);
|
|
transport_child_layer = userauth_layer;
|
|
}
|
|
|
|
srv->base_layer = ssh2_transport_new(
|
|
srv->conf, NULL, 0, NULL,
|
|
ssh_verstring_get_remote(old_bpp),
|
|
ssh_verstring_get_local(old_bpp),
|
|
#ifndef NO_GSSAPI
|
|
&srv->gss_state,
|
|
#else
|
|
NULL,
|
|
#endif
|
|
&srv->stats, transport_child_layer, srv->ssc);
|
|
ssh2_transport_provide_hostkeys(
|
|
srv->base_layer, srv->hostkeys, srv->nhostkeys);
|
|
if (userauth_layer)
|
|
ssh2_userauth_server_set_transport_layer(
|
|
userauth_layer, srv->base_layer);
|
|
server_connect_ppl(srv, srv->base_layer);
|
|
|
|
} else {
|
|
srv->bpp = ssh1_bpp_new(srv->logctx);
|
|
server_connect_bpp(srv);
|
|
|
|
connection_layer = ssh1_connection_new(
|
|
&srv->ssh, srv->conf, &srv->dummy_user_input, &srv->cl);
|
|
ssh1connection_server_configure(connection_layer, srv->ssc);
|
|
server_connect_ppl(srv, connection_layer);
|
|
|
|
srv->base_layer = ssh1_login_server_new(
|
|
connection_layer, srv->hostkey1, srv->authpolicy, srv->ssc);
|
|
server_connect_ppl(srv, srv->base_layer);
|
|
}
|
|
|
|
/* Connect the base layer - whichever it is - to the BPP, and set
|
|
* up its selfptr. */
|
|
srv->base_layer->selfptr = &srv->base_layer;
|
|
ssh_ppl_setup_queues(srv->base_layer, &srv->bpp->in_pq, &srv->bpp->out_pq);
|
|
|
|
#ifdef FIXME // we probably will want one of these, in the end
|
|
srv->pinger = pinger_new(srv->conf, &srv->backend);
|
|
#endif
|
|
|
|
if (srv->ssc->stunt_open_unconditional_agent_socket) {
|
|
char *socketname;
|
|
srv->stunt_agentfwd = agentfwd_new(srv->cl, &socketname);
|
|
if (srv->stunt_agentfwd) {
|
|
logeventf(srv->logctx, "opened unconditional agent socket at %s\n",
|
|
socketname);
|
|
sfree(socketname);
|
|
}
|
|
}
|
|
|
|
queue_idempotent_callback(&srv->bpp->ic_in_raw);
|
|
ssh_ppl_process_queue(srv->base_layer);
|
|
|
|
ssh_bpp_free(old_bpp);
|
|
}
|