+/* $OpenBSD: sshd.c,v 1.335 2006/07/09 15:15:11 stevesk Exp $ */
/*
* Author: Tatu Ylonen <ylo@cs.hut.fi>
* Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
*/
#include "includes.h"
-RCSID("$OpenBSD: sshd.c,v 1.303 2004/09/15 18:42:27 mickey Exp $");
+
+#include <sys/types.h>
+#ifdef HAVE_SYS_STAT_H
+# include <sys/stat.h>
+#endif
+#include <sys/ioctl.h>
+#include <sys/socket.h>
+#include <sys/wait.h>
+
+#include <fcntl.h>
+#ifdef HAVE_PATHS_H
+#include <paths.h>
+#endif
+#include <grp.h>
+#include <pwd.h>
+#include <signal.h>
#include <openssl/dh.h>
#include <openssl/bn.h>
#include "monitor.h"
#include "monitor_wrap.h"
#include "monitor_fdpass.h"
+#include "version.h"
#ifdef LIBWRAP
#include <tcpd.h>
/* Name of the server configuration file. */
char *config_file_name = _PATH_SERVER_CONFIG_FILE;
-/*
- * Flag indicating whether IPv4 or IPv6. This can be set on the command line.
- * Default value is AF_UNSPEC means both IPv4 and IPv6.
- */
-int IPv4or6 = AF_UNSPEC;
-
/*
* Debug mode flag. This can be set on the command line. If debug
* mode is enabled, extra debugging output will be sent to the system
* the effect is to reread the configuration file (and to regenerate
* the server key).
*/
+
+/*ARGSUSED*/
static void
sighup_handler(int sig)
{
/*
* Generic signal handler for terminating signals in the master daemon.
*/
+/*ARGSUSED*/
static void
sigterm_handler(int sig)
{
* SIGCHLD handler. This is called whenever a child dies. This will then
* reap any zombies left by exited children.
*/
+/*ARGSUSED*/
static void
main_sigchld_handler(int sig)
{
/*
* Signal handler for the alarm after the login grace period has expired.
*/
+/*ARGSUSED*/
static void
grace_alarm_handler(int sig)
{
arc4random_stir();
}
+/*ARGSUSED*/
static void
key_regeneration_alarm(int sig)
{
static void
sshd_exchange_identification(int sock_in, int sock_out)
{
- int i, mismatch;
+ u_int i;
+ int mismatch;
int remote_major, remote_minor;
int major, minor;
char *s;
if (authctxt->pw->pw_uid == 0 || options.use_login) {
#endif
/* File descriptor passing is broken or root login */
- monitor_apply_keystate(pmonitor);
use_privsep = 0;
- return;
- }
-
- /* Authentication complete */
- alarm(0);
- if (startup_pipe != -1) {
- close(startup_pipe);
- startup_pipe = -1;
+ goto skip;
}
/* New socket pair */
/* Drop privileges */
do_setusercontext(authctxt->pw);
+ skip:
/* It is safe now to apply the key state */
monitor_apply_keystate(pmonitor);
+
+ /*
+ * Tell the packet layer that authentication was successful, since
+ * this information is not part of the key state.
+ */
+ packet_set_authenticated();
}
static char *
p += options.max_startups_rate;
r = arc4random() % 100;
- debug("drop_connection: p %g, r %g", p, r);
+ debug("drop_connection: p %d, r %d", p, r);
return (r < p) ? 1 : 0;
}
* bignum iqmp "
* bignum p "
* bignum q "
+ * string rngseed (only if OpenSSL is not self-seeded)
*/
buffer_init(&m);
buffer_put_cstring(&m, buffer_ptr(conf));
} else
buffer_put_int(&m, 0);
+#ifndef OPENSSL_PRNG_ONLY
+ rexec_send_rng_seed(&m);
+#endif
+
if (ssh_msg_send(fd, 0, &m) == -1)
fatal("%s: ssh_msg_send failed", __func__);
rsa_generate_additional_parameters(
sensitive_data.server_key->rsa);
}
+
+#ifndef OPENSSL_PRNG_ONLY
+ rexec_recv_rng_seed(&m);
+#endif
+
buffer_free(&m);
debug3("%s: done", __func__);
{
extern char *optarg;
extern int optind;
- int opt, j, i, fdsetsz, on = 1;
+ int opt, j, i, on = 1;
int sock_in = -1, sock_out = -1, newsock = -1;
pid_t pid;
socklen_t fromlen;
/* Save argv. Duplicate so setproctitle emulation doesn't clobber it */
saved_argc = ac;
rexec_argc = ac;
- saved_argv = xmalloc(sizeof(*saved_argv) * (ac + 1));
+ saved_argv = xcalloc(ac + 1, sizeof(*saved_argv));
for (i = 0; i < ac; i++)
saved_argv[i] = xstrdup(av[i]);
saved_argv[i] = NULL;
if (geteuid() == 0 && setgroups(0, NULL) == -1)
debug("setgroups(): %.200s", strerror(errno));
+ /* Ensure that fds 0, 1 and 2 are open or directed to /dev/null */
+ sanitise_stdfd();
+
/* Initialize configuration options to their default values. */
initialize_server_options(&options);
while ((opt = getopt(ac, av, "f:p:b:k:h:g:u:o:dDeiqrtQR46")) != -1) {
switch (opt) {
case '4':
- IPv4or6 = AF_INET;
+ options.address_family = AF_INET;
break;
case '6':
- IPv4or6 = AF_INET6;
+ options.address_family = AF_INET6;
break;
case 'f':
config_file_name = optarg;
options.log_level = SYSLOG_LEVEL_QUIET;
break;
case 'b':
- options.server_key_bits = atoi(optarg);
+ options.server_key_bits = (int)strtonum(optarg, 256,
+ 32768, NULL);
break;
case 'p':
options.ports_from_cmdline = 1;
test_flag = 1;
break;
case 'u':
- utmp_len = atoi(optarg);
+ utmp_len = (u_int)strtonum(optarg, 0, MAXHOSTNAMELEN+1, NULL);
if (utmp_len > MAXHOSTNAMELEN) {
fprintf(stderr, "Invalid utmp length.\n");
exit(1);
closefrom(REEXEC_DEVCRYPTO_RESERVED_FD);
SSLeay_add_all_algorithms();
- channel_set_af(IPv4or6);
/*
* Force logging to stderr until we have loaded the private host
SYSLOG_FACILITY_AUTH : options.log_facility,
log_stderr || !inetd_flag);
-#ifdef _AIX
/*
* Unset KRB5CCNAME, otherwise the user's session may inherit it from
* root's environment
- */
- unsetenv("KRB5CCNAME");
-#endif /* _AIX */
+ */
+ if (getenv("KRB5CCNAME") != NULL)
+ unsetenv("KRB5CCNAME");
+
#ifdef _UNICOS
/* Cray can define user privs drop all privs now!
* Not needed on PRIV_SU systems!
drop_cray_privs();
#endif
- seed_rng();
-
sensitive_data.server_key = NULL;
sensitive_data.ssh1_host_key = NULL;
sensitive_data.have_ssh1_key = 0;
if (!rexec_flag)
buffer_free(&cfg);
+ seed_rng();
+
/* Fill in default values for those options not explicitly set. */
fill_default_server_options(&options);
+ /* set default channel AF */
+ channel_set_af(options.address_family);
+
/* Check that there are no remaining arguments. */
if (optind < ac) {
fprintf(stderr, "Extra argument %s.\n", av[optind]);
debug("sshd version %.100s", SSH_RELEASE);
/* load private host keys */
- sensitive_data.host_keys = xmalloc(options.num_host_key_files *
+ sensitive_data.host_keys = xcalloc(options.num_host_key_files,
sizeof(Key *));
for (i = 0; i < options.num_host_key_files; i++)
sensitive_data.host_keys[i] = NULL;
}
if (use_privsep) {
- struct passwd *pw;
struct stat st;
- if ((pw = getpwnam(SSH_PRIVSEP_USER)) == NULL)
+ if (getpwnam(SSH_PRIVSEP_USER) == NULL)
fatal("Privilege separation user %s does not exist",
SSH_PRIVSEP_USER);
if ((stat(_PATH_PRIVSEP_CHROOT_DIR, &st) == -1) ||
debug("setgroups() failed: %.200s", strerror(errno));
if (rexec_flag) {
- rexec_argv = xmalloc(sizeof(char *) * (rexec_argc + 2));
+ rexec_argv = xcalloc(rexec_argc + 2, sizeof(char *));
for (i = 0; i < rexec_argc; i++) {
debug("rexec_argv[%d]='%s'", i, saved_argv[i]);
rexec_argv[i] = saved_argv[i];
}
/* Initialize the log (it is reinitialized below in case we forked). */
- if (debug_flag && !inetd_flag)
+ if (debug_flag && (!inetd_flag || rexeced_flag))
log_stderr = 1;
log_init(__progname, options.log_level, options.log_facility, log_stderr);
if (num_listen_socks >= MAX_LISTEN_SOCKS)
fatal("Too many listen sockets. "
"Enlarge MAX_LISTEN_SOCKS");
- if (getnameinfo(ai->ai_addr, ai->ai_addrlen,
+ if ((ret = getnameinfo(ai->ai_addr, ai->ai_addrlen,
ntop, sizeof(ntop), strport, sizeof(strport),
- NI_NUMERICHOST|NI_NUMERICSERV) != 0) {
- error("getnameinfo failed");
+ NI_NUMERICHOST|NI_NUMERICSERV)) != 0) {
+ error("getnameinfo failed: %.100s",
+ (ret != EAI_SYSTEM) ? gai_strerror(ret) :
+ strerror(errno));
continue;
}
/* Create socket for listening. */
num_listen_socks++;
/* Start listening on the port. */
- logit("Server listening on %s port %s.", ntop, strport);
if (listen(listen_sock, SSH_LISTEN_BACKLOG) < 0)
- fatal("listen: %.100s", strerror(errno));
-
+ fatal("listen on [%s]:%s: %.100s",
+ ntop, strport, strerror(errno));
+ logit("Server listening on %s port %s.", ntop, strport);
}
freeaddrinfo(options.listen_addrs);
if (listen_socks[i] > maxfd)
maxfd = listen_socks[i];
/* pipes connected to unauthenticated childs */
- startup_pipes = xmalloc(options.max_startups * sizeof(int));
+ startup_pipes = xcalloc(options.max_startups, sizeof(int));
for (i = 0; i < options.max_startups; i++)
startup_pipes[i] = -1;
sighup_restart();
if (fdset != NULL)
xfree(fdset);
- fdsetsz = howmany(maxfd+1, NFDBITS) * sizeof(fd_mask);
- fdset = (fd_set *)xmalloc(fdsetsz);
- memset(fdset, 0, fdsetsz);
+ fdset = (fd_set *)xcalloc(howmany(maxfd + 1, NFDBITS),
+ sizeof(fd_mask));
for (i = 0; i < num_listen_socks; i++)
FD_SET(listen_socks[i], fdset);
if (!FD_ISSET(listen_socks[i], fdset))
continue;
fromlen = sizeof(from);
- newsock = accept(listen_socks[i], (struct sockaddr *)&from,
- &fromlen);
+ newsock = accept(listen_socks[i],
+ (struct sockaddr *)&from, &fromlen);
if (newsock < 0) {
if (errno != EINTR && errno != EWOULDBLOCK)
error("accept: %.100s", strerror(errno));
*/
if ((pid = fork()) == 0) {
/*
- * Child. Close the listening and max_startup
- * sockets. Start using the accepted socket.
- * Reinitialize logging (since our pid has
- * changed). We break out of the loop to handle
+ * Child. Close the listening and
+ * max_startup sockets. Start using
+ * the accepted socket. Reinitialize
+ * logging (since our pid has changed).
+ * We break out of the loop to handle
* the connection.
*/
startup_pipe = startup_p[1];
close_listen_socks();
sock_in = newsock;
sock_out = newsock;
- log_init(__progname, options.log_level, options.log_facility, log_stderr);
+ log_init(__progname,
+ options.log_level,
+ options.log_facility,
+ log_stderr);
if (rexec_flag)
close(config_s[0]);
break;
close(config_s[1]);
}
- /* Mark that the key has been used (it was "given" to the child). */
+ /*
+ * Mark that the key has been used (it
+ * was "given" to the child).
+ */
if ((options.protocol & SSH_PROTO_1) &&
key_used == 0) {
/* Schedule server key regeneration alarm. */
}
arc4random_stir();
-
- /* Close the new socket (the child is now taking care of it). */
close(newsock);
}
/* child process check (or debug mode) */
signal(SIGCHLD, SIG_DFL);
signal(SIGINT, SIG_DFL);
- /* Set SO_KEEPALIVE if requested. */
- if (options.tcp_keep_alive &&
- setsockopt(sock_in, SOL_SOCKET, SO_KEEPALIVE, &on,
- sizeof(on)) < 0)
- error("setsockopt SO_KEEPALIVE: %.100s", strerror(errno));
-
/*
* Register our connection. This turns encryption off because we do
* not have a key.
*/
packet_set_connection(sock_in, sock_out);
+ packet_set_server();
- remote_port = get_remote_port();
+ /* Set SO_KEEPALIVE if requested. */
+ if (options.tcp_keep_alive && packet_connection_is_on_socket() &&
+ setsockopt(sock_in, SOL_SOCKET, SO_KEEPALIVE, &on, sizeof(on)) < 0)
+ error("setsockopt SO_KEEPALIVE: %.100s", strerror(errno));
+
+ if ((remote_port = get_remote_port()) < 0) {
+ debug("get_remote_port failed");
+ cleanup_exit(255);
+ }
+
+ /*
+ * We use get_canonical_hostname with usedns = 0 instead of
+ * get_remote_ipaddr here so IP options will be checked.
+ */
+ (void) get_canonical_hostname(0);
+ /*
+ * The rest of the code depends on the fact that
+ * get_remote_ipaddr() caches the remote ip, even if
+ * the socket goes away.
+ */
remote_ip = get_remote_ipaddr();
+#ifdef SSH_AUDIT_EVENTS
+ audit_connection_from(remote_ip, remote_port);
+#endif
#ifdef LIBWRAP
/* Check whether logins are denied from this host. */
if (packet_connection_is_on_socket()) {
verbose("Connection from %.500s port %d", remote_ip, remote_port);
/*
- * We don\'t want to listen forever unless the other side
+ * We don't want to listen forever unless the other side
* successfully authenticates itself. So we set up an alarm which is
* cleared after successful authentication. A limit of zero
- * indicates no limit. Note that we don\'t set the alarm in debugging
+ * indicates no limit. Note that we don't set the alarm in debugging
* mode; it is just annoying to have the server exit just when you
* are about to discover the bug.
*/
packet_set_nonblocking();
- /* prepare buffers to collect authentication messages */
- buffer_init(&loginmsg);
-
/* allocate authentication context */
- authctxt = xmalloc(sizeof(*authctxt));
- memset(authctxt, 0, sizeof(*authctxt));
+ authctxt = xcalloc(1, sizeof(*authctxt));
+
+ authctxt->loginmsg = &loginmsg;
/* XXX global for cleanup, access from other modules */
the_authctxt = authctxt;
+ /* prepare buffer to collect messages to display to user after login */
+ buffer_init(&loginmsg);
+
if (use_privsep)
if (privsep_preauth(authctxt) == 1)
goto authenticated;
- /* prepare buffer to collect messages to display to user after login */
- buffer_init(&loginmsg);
-
/* perform the key exchange */
/* authenticate user and start session */
if (compat20) {
}
authenticated:
+ /*
+ * Cancel the alarm we set to limit the time taken for
+ * authentication.
+ */
+ alarm(0);
+ signal(SIGALRM, SIG_DFL);
+ if (startup_pipe != -1) {
+ close(startup_pipe);
+ startup_pipe = -1;
+ }
+
+#ifdef SSH_AUDIT_EVENTS
+ audit_event(SSH_AUTH_SUCCESS);
+#endif
+
/*
* In privilege separation, we fork another child and prepare
* file descriptor passing.
finish_pam();
#endif /* USE_PAM */
+#ifdef SSH_AUDIT_EVENTS
+ PRIVSEP(audit_event(SSH_CONNECTION_CLOSE));
+#endif
+
packet_close();
if (use_privsep)
{
int rsafail = 0;
- if (BN_cmp(sensitive_data.server_key->rsa->n, sensitive_data.ssh1_host_key->rsa->n) > 0) {
+ if (BN_cmp(sensitive_data.server_key->rsa->n,
+ sensitive_data.ssh1_host_key->rsa->n) > 0) {
/* Server key has bigger modulus. */
if (BN_num_bits(sensitive_data.server_key->rsa->n) <
- BN_num_bits(sensitive_data.ssh1_host_key->rsa->n) + SSH_KEY_BITS_RESERVED) {
- fatal("do_connection: %s: server_key %d < host_key %d + SSH_KEY_BITS_RESERVED %d",
+ BN_num_bits(sensitive_data.ssh1_host_key->rsa->n) +
+ SSH_KEY_BITS_RESERVED) {
+ fatal("do_connection: %s: "
+ "server_key %d < host_key %d + SSH_KEY_BITS_RESERVED %d",
get_remote_ipaddr(),
BN_num_bits(sensitive_data.server_key->rsa->n),
BN_num_bits(sensitive_data.ssh1_host_key->rsa->n),
} else {
/* Host key has bigger modulus (or they are equal). */
if (BN_num_bits(sensitive_data.ssh1_host_key->rsa->n) <
- BN_num_bits(sensitive_data.server_key->rsa->n) + SSH_KEY_BITS_RESERVED) {
- fatal("do_connection: %s: host_key %d < server_key %d + SSH_KEY_BITS_RESERVED %d",
+ BN_num_bits(sensitive_data.server_key->rsa->n) +
+ SSH_KEY_BITS_RESERVED) {
+ fatal("do_connection: %s: "
+ "host_key %d < server_key %d + SSH_KEY_BITS_RESERVED %d",
get_remote_ipaddr(),
BN_num_bits(sensitive_data.ssh1_host_key->rsa->n),
BN_num_bits(sensitive_data.server_key->rsa->n),
if (!rsafail) {
BN_mask_bits(session_key_int, sizeof(session_key) * 8);
len = BN_num_bytes(session_key_int);
- if (len < 0 || len > sizeof(session_key)) {
+ if (len < 0 || (u_int)len > sizeof(session_key)) {
error("do_connection: bad session key len from %s: "
"session_key_int %d > sizeof(session_key) %lu",
get_remote_ipaddr(), len, (u_long)sizeof(session_key));
myproposal[PROPOSAL_MAC_ALGS_CTOS] =
myproposal[PROPOSAL_MAC_ALGS_STOC] = options.macs;
}
- if (!options.compression) {
+ 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,zlib@openssh.com";
}
+
myproposal[PROPOSAL_SERVER_HOST_KEY_ALGS] = list_hostkey_types();
/* start key exchange */
kex->kex[KEX_DH_GRP1_SHA1] = kexdh_server;
kex->kex[KEX_DH_GRP14_SHA1] = kexdh_server;
kex->kex[KEX_DH_GEX_SHA1] = kexgex_server;
+ kex->kex[KEX_DH_GEX_SHA256] = kexgex_server;
kex->server = 1;
kex->client_version_string=client_version_string;
kex->server_version_string=server_version_string;
{
if (the_authctxt)
do_cleanup(the_authctxt);
+#ifdef SSH_AUDIT_EVENTS
+ /* done after do_cleanup so it can cancel the PAM auth 'thread' */
+ if (!use_privsep || mm_is_monitor())
+ audit_event(SSH_CONNECTION_ABANDON);
+#endif
_exit(i);
}
andersk / openssh.git / blobdiff