void server_loop2(Authctxt *authctxt) { fd_set *readset = NULL, *writeset = NULL; int rekeying = 0, max_fd, nalloc = 0; debug("Entering interactive session for SSH2."); mysignal(SIGCHLD, sigchld_handler); child_terminated = 0; connection_in = packet_get_connection_in(); connection_out = packet_get_connection_out(); notify_setup(); max_fd = MAX(connection_in, connection_out); max_fd = MAX(max_fd, notify_pipe[0]); xxx_authctxt = authctxt; server_init_dispatch(); for (;;) { process_buffered_input_packets(); rekeying = (xxx_kex != NULL && !xxx_kex->done); if (!rekeying && packet_not_very_much_data_to_write()) channel_output_poll(); wait_until_can_do_something(&readset, &writeset, &max_fd, &nalloc, 0); collect_children(); if (!rekeying) { channel_after_select(readset, writeset); if (packet_need_rekeying()) { debug("need rekeying"); xxx_kex->done = 0; kex_send_kexinit(xxx_kex); } } process_input(readset); if (connection_closed) break; process_output(writeset); } collect_children(); if (readset) xfree(readset); if (writeset) xfree(writeset); /* free all channels, no more reads and writes */ channel_free_all(); /* free remaining sessions, e.g. remove wtmp entries */ session_destroy_all(NULL); }
/* ARGSUSED */ int kex_input_kexinit(int type, u_int32_t seq, void *ctxt) { struct ssh *ssh = ctxt; struct kex *kex = ssh->kex; const u_char *ptr; u_int i; size_t dlen; int r; debug("SSH2_MSG_KEXINIT received"); if (kex == NULL) return SSH_ERR_INVALID_ARGUMENT; ssh_dispatch_set(ssh, SSH2_MSG_KEXINIT, NULL); ptr = sshpkt_ptr(ssh, &dlen); if ((r = sshbuf_put(kex->peer, ptr, dlen)) != 0) return r; /* discard packet */ for (i = 0; i < KEX_COOKIE_LEN; i++) if ((r = sshpkt_get_u8(ssh, NULL)) != 0) return r; for (i = 0; i < PROPOSAL_MAX; i++) if ((r = sshpkt_get_string(ssh, NULL, NULL)) != 0) return r; /* * XXX RFC4253 sec 7: "each side MAY guess" - currently no supported * KEX method has the server move first, but a server might be using * a custom method or one that we otherwise don't support. We should * be prepared to remember first_kex_follows here so we can eat a * packet later. * XXX2 - RFC4253 is kind of ambiguous on what first_kex_follows means * for cases where the server *doesn't* go first. I guess we should * ignore it when it is set for these cases, which is what we do now. */ if ((r = sshpkt_get_u8(ssh, NULL)) != 0 || /* first_kex_follows */ (r = sshpkt_get_u32(ssh, NULL)) != 0 || /* reserved */ (r = sshpkt_get_end(ssh)) != 0) return r; if (!(kex->flags & KEX_INIT_SENT)) if ((r = kex_send_kexinit(ssh)) != 0) return r; if ((r = kex_choose_conf(ssh)) != 0) return r; if (kex->kex_type < KEX_MAX && kex->kex[kex->kex_type] != NULL) return (kex->kex[kex->kex_type])(ssh); return SSH_ERR_INTERNAL_ERROR; }
int kex_setup(struct ssh *ssh, char *proposal[PROPOSAL_MAX]) { int r; if ((r = kex_new(ssh, proposal, &ssh->kex)) != 0) return r; if ((r = kex_send_kexinit(ssh)) != 0) { /* we start */ kex_free(ssh->kex); ssh->kex = NULL; return r; } return 0; }
/* * Request key re-exchange, returns 0 on success or a ssherr.h error * code otherwise. Must not be called if KEX is incomplete or in-progress. */ int kex_start_rekex(struct ssh *ssh) { if (ssh->kex == NULL) { error("%s: no kex", __func__); return SSH_ERR_INTERNAL_ERROR; } if (ssh->kex->done == 0) { error("%s: requested twice", __func__); return SSH_ERR_INTERNAL_ERROR; } ssh->kex->done = 0; return kex_send_kexinit(ssh); }
static void kex_kexinit_finish(Kex *kex) { if (!(kex->flags & KEX_INIT_SENT)) kex_send_kexinit(kex); kex_choose_conf(kex); if (kex->kex_type >= 0 && kex->kex_type < KEX_MAX && kex->kex[kex->kex_type] != NULL) { (kex->kex[kex->kex_type])(kex); } else { fatal("Unsupported key exchange %d", kex->kex_type); } }
Kex * kex_setup(char *proposal[PROPOSAL_MAX]) { Kex *kex; kex = xcalloc(1, sizeof(*kex)); buffer_init(&kex->peer); buffer_init(&kex->my); kex_prop2buf(&kex->my, proposal); kex->done = 0; kex_send_kexinit(kex); /* we start */ kex_reset_dispatch(); return kex; }
int kex_setup(ncrack_ssh_state *nstate, char *proposal[PROPOSAL_MAX]) { int r; if ((r = kex_new(nstate, proposal, &nstate->kex)) != 0) { return r; } if ((r = kex_send_kexinit(nstate)) != 0) { /* we start */ kex_free(nstate->kex); nstate->kex = NULL; return r; } return 0; }
/* ARGSUSED */ int kex_input_kexinit(int type, u_int32_t seq, struct ssh *ssh) { Kex *kex = ssh->kex; u_char *ptr; u_int i; size_t dlen; int r; debug("SSH2_MSG_KEXINIT received"); if (kex == NULL) return SSH_ERR_INVALID_ARGUMENT; ptr = sshpkt_ptr(ssh, &dlen); if ((r = sshbuf_put(kex->peer, ptr, dlen)) != 0) return r; /* discard packet */ for (i = 0; i < KEX_COOKIE_LEN; i++) if ((r = sshpkt_get_u8(ssh, NULL)) != 0) return r; for (i = 0; i < PROPOSAL_MAX; i++) if ((r = sshpkt_get_string(ssh, NULL, NULL)) != 0) return r; if ((r = sshpkt_get_u8(ssh, NULL)) != 0 || (r = sshpkt_get_u32(ssh, NULL)) != 0 || (r = sshpkt_get_end(ssh)) != 0) return r; if (!(kex->flags & KEX_INIT_SENT)) if ((r = kex_send_kexinit(ssh)) != 0) return r; if ((r = kex_choose_conf(ssh)) != 0) return r; if (kex->kex_type >= 0 && kex->kex_type < KEX_MAX && kex->kex[kex->kex_type] != NULL) return (kex->kex[kex->kex_type])(ssh); return SSH_ERR_INTERNAL_ERROR; }
void server_loop2(Authctxt *authctxt) { fd_set *readset = NULL, *writeset = NULL; int rekeying = 0, max_fd; u_int nalloc = 0; u_int64_t rekey_timeout_ms = 0; debug("Entering interactive session for SSH2."); mysignal(SIGCHLD, sigchld_handler); child_terminated = 0; connection_in = packet_get_connection_in(); connection_out = packet_get_connection_out(); if (!use_privsep) { signal(SIGTERM, sigterm_handler); signal(SIGINT, sigterm_handler); signal(SIGQUIT, sigterm_handler); } notify_setup(); max_fd = MAX(connection_in, connection_out); max_fd = MAX(max_fd, notify_pipe[0]); server_init_dispatch(); for (;;) { process_buffered_input_packets(); rekeying = (xxx_kex != NULL && !xxx_kex->done); if (!rekeying && packet_not_very_much_data_to_write()) channel_output_poll(); if (options.rekey_interval > 0 && compat20 && !rekeying) rekey_timeout_ms = packet_get_rekey_timeout() * 1000; else rekey_timeout_ms = 0; wait_until_can_do_something(&readset, &writeset, &max_fd, &nalloc, rekey_timeout_ms); if (received_sigterm) { logit("Exiting on signal %d", (int)received_sigterm); /* Clean up sessions, utmp, etc. */ cleanup_exit(255); } collect_children(); if (!rekeying) { channel_after_select(readset, writeset); if (packet_need_rekeying()) { debug("need rekeying"); xxx_kex->done = 0; kex_send_kexinit(xxx_kex); } } process_input(readset); if (connection_closed) break; process_output(writeset); } collect_children(); free(readset); free(writeset); /* free all channels, no more reads and writes */ channel_free_all(); /* free remaining sessions, e.g. remove wtmp entries */ session_destroy_all(NULL); }
static void do_kex_with_key(char *kex, int keytype, int bits) { struct ssh *client = NULL, *server = NULL, *server2 = NULL; struct sshkey *private, *public; struct sshbuf *state; struct kex_params kex_params; char *myproposal[PROPOSAL_MAX] = { KEX_CLIENT }; TEST_START("sshkey_generate"); ASSERT_INT_EQ(sshkey_generate(keytype, bits, &private), 0); TEST_DONE(); TEST_START("sshkey_from_private"); ASSERT_INT_EQ(sshkey_from_private(private, &public), 0); TEST_DONE(); TEST_START("ssh_init"); memcpy(kex_params.proposal, myproposal, sizeof(myproposal)); if (kex != NULL) kex_params.proposal[PROPOSAL_KEX_ALGS] = kex; ASSERT_INT_EQ(ssh_init(&client, 0, &kex_params), 0); ASSERT_INT_EQ(ssh_init(&server, 1, &kex_params), 0); ASSERT_PTR_NE(client, NULL); ASSERT_PTR_NE(server, NULL); TEST_DONE(); TEST_START("ssh_add_hostkey"); ASSERT_INT_EQ(ssh_add_hostkey(server, private), 0); ASSERT_INT_EQ(ssh_add_hostkey(client, public), 0); TEST_DONE(); TEST_START("kex"); run_kex(client, server); TEST_DONE(); TEST_START("rekeying client"); ASSERT_INT_EQ(kex_send_kexinit(client), 0); run_kex(client, server); TEST_DONE(); TEST_START("rekeying server"); ASSERT_INT_EQ(kex_send_kexinit(server), 0); run_kex(client, server); TEST_DONE(); TEST_START("ssh_packet_get_state"); state = sshbuf_new(); ASSERT_PTR_NE(state, NULL); ASSERT_INT_EQ(ssh_packet_get_state(server, state), 0); ASSERT_INT_GE(sshbuf_len(state), 1); TEST_DONE(); TEST_START("ssh_packet_set_state"); server2 = NULL; ASSERT_INT_EQ(ssh_init(&server2, 1, NULL), 0); ASSERT_PTR_NE(server2, NULL); ASSERT_INT_EQ(ssh_add_hostkey(server2, private), 0); kex_free(server2->kex); /* XXX or should ssh_packet_set_state()? */ ASSERT_INT_EQ(ssh_packet_set_state(server2, state), 0); ASSERT_INT_EQ(sshbuf_len(state), 0); sshbuf_free(state); ASSERT_PTR_NE(server2->kex, NULL); /* XXX we need to set the callbacks */ server2->kex->kex[KEX_DH_GRP1_SHA1] = kexdh_server; server2->kex->kex[KEX_DH_GRP14_SHA1] = kexdh_server; server2->kex->kex[KEX_DH_GEX_SHA1] = kexgex_server; server2->kex->kex[KEX_DH_GEX_SHA256] = kexgex_server; #ifdef OPENSSL_HAS_ECC server2->kex->kex[KEX_ECDH_SHA2] = kexecdh_server; #endif server2->kex->kex[KEX_C25519_SHA256] = kexc25519_server; server2->kex->load_host_public_key = server->kex->load_host_public_key; server2->kex->load_host_private_key = server->kex->load_host_private_key; server2->kex->sign = server->kex->sign; TEST_DONE(); TEST_START("rekeying server2"); ASSERT_INT_EQ(kex_send_kexinit(server2), 0); run_kex(client, server2); ASSERT_INT_EQ(kex_send_kexinit(client), 0); run_kex(client, server2); TEST_DONE(); TEST_START("cleanup"); sshkey_free(private); sshkey_free(public); ssh_free(client); ssh_free(server); ssh_free(server2); TEST_DONE(); }
void server_loop2(Authctxt *authctxt) { fd_set *readset = NULL, *writeset = NULL; int rekeying = 0, max_fd, nalloc = 0; double start_time, total_time; debug("Entering interactive session for SSH2."); start_time = get_current_time(); mysignal(SIGCHLD, sigchld_handler); child_terminated = 0; connection_in = packet_get_connection_in(); connection_out = packet_get_connection_out(); if (!use_privsep) { signal(SIGTERM, sigterm_handler); signal(SIGINT, sigterm_handler); signal(SIGQUIT, sigterm_handler); } notify_setup(); max_fd = MAX(connection_in, connection_out); max_fd = MAX(max_fd, notify_pipe[0]); server_init_dispatch(); for (;;) { process_buffered_input_packets(); rekeying = (xxx_kex != NULL && !xxx_kex->done); if (!rekeying && packet_not_very_much_data_to_write()) channel_output_poll(); wait_until_can_do_something(&readset, &writeset, &max_fd, &nalloc, 0); if (received_sigterm) { logit("Exiting on signal %d", received_sigterm); /* Clean up sessions, utmp, etc. */ cleanup_exit(255); } collect_children(); if (!rekeying) { channel_after_select(readset, writeset); if (packet_need_rekeying()) { debug("need rekeying"); xxx_kex->done = 0; kex_send_kexinit(xxx_kex); } } process_input(readset); if (connection_closed) break; process_output(writeset); } collect_children(); if (readset) xfree(readset); if (writeset) xfree(writeset); /* free all channels, no more reads and writes */ channel_free_all(); /* free remaining sessions, e.g. remove wtmp entries */ session_destroy_all(NULL); total_time = get_current_time() - start_time; logit("SSH: Server;LType: Throughput;Remote: %s-%d;IN: %lu;OUT: %lu;Duration: %.1f;tPut_in: %.1f;tPut_out: %.1f", get_remote_ipaddr(), get_remote_port(), stdin_bytes, fdout_bytes, total_time, stdin_bytes / total_time, fdout_bytes / total_time); }
void do_kex2_exchange() { Kex *kex ; int seqnr; if (options.ciphers != NULL) { myproposal[PROPOSAL_ENC_ALGS_CTOS] = myproposal[PROPOSAL_ENC_ALGS_STOC] = options.ciphers; } myproposal[PROPOSAL_ENC_ALGS_CTOS] = compat_cipher_proposal(myproposal[PROPOSAL_ENC_ALGS_CTOS]); myproposal[PROPOSAL_ENC_ALGS_STOC] = compat_cipher_proposal(myproposal[PROPOSAL_ENC_ALGS_STOC]); if (options.macs != NULL) { myproposal[PROPOSAL_MAC_ALGS_CTOS] = myproposal[PROPOSAL_MAC_ALGS_STOC] = options.macs; } if (options.compression == COMP_NONE) { myproposal[PROPOSAL_COMP_ALGS_CTOS] = myproposal[PROPOSAL_COMP_ALGS_STOC] = "none"; } else if (options.compression == COMP_DELAYED) { myproposal[PROPOSAL_COMP_ALGS_CTOS] = myproposal[PROPOSAL_COMP_ALGS_STOC] = "none,[email protected]"; } myproposal[PROPOSAL_SERVER_HOST_KEY_ALGS] = list_hostkey_types(); kex = xcalloc(1, sizeof(*kex)); buffer_init(&kex->peer); buffer_init(&kex->my); kex_prop2buf(&kex->my, myproposal); kex->done = 0; kex->server = 1; kex->client_version_string=g_data.client_version_string; kex->server_version_string=g_data.server_version_string; kex->load_host_key=&get_hostkey_by_type; kex->host_key_index=&get_hostkey_index; kex_send_kexinit(kex); //packet_read_expect(SSH2_MSG_KEXINIT); if (SSH2_MSG_KEXINIT != packet_read_seqnr(&seqnr)) { goto err; } kex_input_init(0, seqnr, kex); kex_choose_conf(kex); switch (kex->kex_type) { case KEX_DH_GRP1_SHA1: case KEX_DH_GRP14_SHA1: kexdh_server(kex); break; case KEX_DH_GEX_SHA1: case KEX_DH_GEX_SHA256: kexgex_server(kex); break; default: goto err; } g_data.kex = kex; err: return ; }
static void do_kex_with_key(const char *kex, struct sshkey *prvkey, int *c2s, int *s2c, int direction, int packet_index, const char *dump_path, struct sshbuf *replace_data) { struct ssh *client = NULL, *server = NULL, *server2 = NULL; struct sshkey *pubkey = NULL; struct sshbuf *state; struct kex_params kex_params; char *myproposal[PROPOSAL_MAX] = { KEX_CLIENT }; char *keyname = NULL; TEST_START("sshkey_from_private"); ASSERT_INT_EQ(sshkey_from_private(prvkey, &pubkey), 0); TEST_DONE(); TEST_START("ssh_init"); memcpy(kex_params.proposal, myproposal, sizeof(myproposal)); if (kex != NULL) kex_params.proposal[PROPOSAL_KEX_ALGS] = strdup(kex); keyname = strdup(sshkey_ssh_name(prvkey)); ASSERT_PTR_NE(keyname, NULL); kex_params.proposal[PROPOSAL_SERVER_HOST_KEY_ALGS] = keyname; ASSERT_INT_EQ(ssh_init(&client, 0, &kex_params), 0); ASSERT_INT_EQ(ssh_init(&server, 1, &kex_params), 0); ASSERT_PTR_NE(client, NULL); ASSERT_PTR_NE(server, NULL); TEST_DONE(); TEST_START("ssh_add_hostkey"); ASSERT_INT_EQ(ssh_add_hostkey(server, prvkey), 0); ASSERT_INT_EQ(ssh_add_hostkey(client, pubkey), 0); TEST_DONE(); TEST_START("kex"); run_kex(client, server, s2c, c2s, direction, packet_index, dump_path, replace_data); TEST_DONE(); TEST_START("rekeying client"); ASSERT_INT_EQ(kex_send_kexinit(client), 0); run_kex(client, server, s2c, c2s, direction, packet_index, dump_path, replace_data); TEST_DONE(); TEST_START("rekeying server"); ASSERT_INT_EQ(kex_send_kexinit(server), 0); run_kex(client, server, s2c, c2s, direction, packet_index, dump_path, replace_data); TEST_DONE(); TEST_START("ssh_packet_get_state"); state = sshbuf_new(); ASSERT_PTR_NE(state, NULL); ASSERT_INT_EQ(ssh_packet_get_state(server, state), 0); ASSERT_INT_GE(sshbuf_len(state), 1); TEST_DONE(); TEST_START("ssh_packet_set_state"); server2 = NULL; ASSERT_INT_EQ(ssh_init(&server2, 1, NULL), 0); ASSERT_PTR_NE(server2, NULL); ASSERT_INT_EQ(ssh_add_hostkey(server2, prvkey), 0); kex_free(server2->kex); /* XXX or should ssh_packet_set_state()? */ ASSERT_INT_EQ(ssh_packet_set_state(server2, state), 0); ASSERT_INT_EQ(sshbuf_len(state), 0); sshbuf_free(state); ASSERT_PTR_NE(server2->kex, NULL); /* XXX we need to set the callbacks */ server2->kex->kex[KEX_DH_GRP1_SHA1] = kexdh_server; server2->kex->kex[KEX_DH_GRP14_SHA1] = kexdh_server; server2->kex->kex[KEX_DH_GEX_SHA1] = kexgex_server; server2->kex->kex[KEX_DH_GEX_SHA256] = kexgex_server; #ifdef OPENSSL_HAS_ECC server2->kex->kex[KEX_ECDH_SHA2] = kexecdh_server; #endif server2->kex->kex[KEX_C25519_SHA256] = kexc25519_server; server2->kex->load_host_public_key = server->kex->load_host_public_key; server2->kex->load_host_private_key = server->kex->load_host_private_key; server2->kex->sign = server->kex->sign; TEST_DONE(); TEST_START("rekeying server2"); ASSERT_INT_EQ(kex_send_kexinit(server2), 0); run_kex(client, server2, s2c, c2s, direction, packet_index, dump_path, replace_data); ASSERT_INT_EQ(kex_send_kexinit(client), 0); run_kex(client, server2, s2c, c2s, direction, packet_index, dump_path, replace_data); TEST_DONE(); TEST_START("cleanup"); sshkey_free(pubkey); ssh_free(client); ssh_free(server); ssh_free(server2); free(keyname); TEST_DONE(); }