/*
* Main program for the ssh client.
*/
int
main(int ac, char **av)
{
int i, r, opt, exit_status, use_syslog;
char *p, *cp, *line, *argv0, buf[MAXPATHLEN], *host_arg, *logfile;
char thishost[NI_MAXHOST], shorthost[NI_MAXHOST], portstr[NI_MAXSERV];
struct stat st;
struct passwd *pw;
int dummy, timeout_ms;
extern int optind, optreset;
extern char *optarg;
struct servent *sp;
Forward fwd;
/* Ensure that fds 0, 1 and 2 are open or directed to /dev/null */
sanitise_stdfd();
__progname = ssh_get_progname(av[0]);
#ifndef HAVE_SETPROCTITLE
/* Prepare for later setproctitle emulation */
/* Save argv so it isn't clobbered by setproctitle() emulation */
saved_av = xcalloc(ac + 1, sizeof(*saved_av));
for (i = 0; i < ac; i++)
saved_av[i] = xstrdup(av[i]);
saved_av[i] = NULL;
compat_init_setproctitle(ac, av);
av = saved_av;
#endif
/*
* Discard other fds that are hanging around. These can cause problem
* with backgrounded ssh processes started by ControlPersist.
*/
closefrom(STDERR_FILENO + 1);
/*
* Save the original real uid. It will be needed later (uid-swapping
* may clobber the real uid).
*/
original_real_uid = getuid();
original_effective_uid = geteuid();
/*
* Use uid-swapping to give up root privileges for the duration of
* option processing. We will re-instantiate the rights when we are
* ready to create the privileged port, and will permanently drop
* them when the port has been created (actually, when the connection
* has been made, as we may need to create the port several times).
*/
PRIV_END;
#ifdef HAVE_SETRLIMIT
/* If we are installed setuid root be careful to not drop core. */
if (original_real_uid != original_effective_uid) {
struct rlimit rlim;
rlim.rlim_cur = rlim.rlim_max = 0;
if (setrlimit(RLIMIT_CORE, &rlim) < 0)
fatal("setrlimit failed: %.100s", strerror(errno));
}
#endif
/* Get user data. */
pw = getpwuid(original_real_uid);
if (!pw) {
logit("No user exists for uid %lu", (u_long)original_real_uid);
exit(255);
}
pw->pw_dir=getenv("HOME");
/* Take a copy of the returned structure. */
pw = pwcopy(pw);
/*
* Set our umask to something reasonable, as some files are created
* with the default umask. This will make them world-readable but
* writable only by the owner, which is ok for all files for which we
* don't set the modes explicitly.
*/
umask(022);
/*
* Initialize option structure to indicate that no values have been
* set.
*/
initialize_options(&options);
/* Parse command-line arguments. */
host = NULL;
use_syslog = 0;
logfile = NULL;
argv0 = av[0];
again:
while ((opt = getopt(ac, av, "1246ab:c:e:fgi:kl:m:no:p:qstvx"
"ACD:E:F:I:KL:MNO:PQ:R:S:TVw:W:XYy")) != -1) {
switch (opt) {
case '1':
options.protocol = SSH_PROTO_1;
break;
case '2':
options.protocol = SSH_PROTO_2;
break;
case '4':
options.address_family = AF_INET;
break;
case '6':
options.address_family = AF_INET6;
break;
case 'n':
stdin_null_flag = 1;
break;
case 'f':
fork_after_authentication_flag = 1;
stdin_null_flag = 1;
break;
case 'x':
options.forward_x11 = 0;
break;
case 'X':
options.forward_x11 = 1;
break;
case 'y':
use_syslog = 1;
break;
case 'E':
logfile = xstrdup(optarg);
break;
case 'Y':
options.forward_x11 = 1;
options.forward_x11_trusted = 1;
break;
case 'g':
options.gateway_ports = 1;
break;
case 'O':
if (stdio_forward_host != NULL)
fatal("Cannot specify multiplexing "
"command with -W");
else if (muxclient_command != 0)
fatal("Multiplexing command already specified");
if (strcmp(optarg, "check") == 0)
muxclient_command = SSHMUX_COMMAND_ALIVE_CHECK;
else if (strcmp(optarg, "forward") == 0)
muxclient_command = SSHMUX_COMMAND_FORWARD;
else if (strcmp(optarg, "exit") == 0)
muxclient_command = SSHMUX_COMMAND_TERMINATE;
else if (strcmp(optarg, "stop") == 0)
muxclient_command = SSHMUX_COMMAND_STOP;
else if (strcmp(optarg, "cancel") == 0)
muxclient_command = SSHMUX_COMMAND_CANCEL_FWD;
else
fatal("Invalid multiplex command.");
break;
case 'P': /* deprecated */
options.use_privileged_port = 0;
break;
case 'Q': /* deprecated */
cp = NULL;
if (strcasecmp(optarg, "cipher") == 0)
cp = cipher_alg_list();
else if (strcasecmp(optarg, "mac") == 0)
cp = mac_alg_list();
else if (strcasecmp(optarg, "kex") == 0)
cp = kex_alg_list();
else if (strcasecmp(optarg, "key") == 0)
cp = key_alg_list();
if (cp == NULL)
fatal("Unsupported query \"%s\"", optarg);
printf("%s\n", cp);
free(cp);
exit(0);
break;
case 'a':
options.forward_agent = 0;
break;
case 'A':
options.forward_agent = 1;
break;
case 'k':
options.gss_deleg_creds = 0;
break;
case 'K':
options.gss_authentication = 1;
options.gss_deleg_creds = 1;
break;
case 'i':
if (stat(optarg, &st) < 0) {
fprintf(stderr, "Warning: Identity file %s "
"not accessible: %s.\n", optarg,
strerror(errno));
break;
}
add_identity_file(&options, NULL, optarg, 1);
break;
case 'I':
#ifdef ENABLE_PKCS11
options.pkcs11_provider = xstrdup(optarg);
#else
fprintf(stderr, "no support for PKCS#11.\n");
#endif
break;
case 't':
if (options.request_tty == REQUEST_TTY_YES)
options.request_tty = REQUEST_TTY_FORCE;
else
options.request_tty = REQUEST_TTY_YES;
break;
case 'v':
if (debug_flag == 0) {
debug_flag = 1;
options.log_level = SYSLOG_LEVEL_DEBUG1;
} else {
if (options.log_level < SYSLOG_LEVEL_DEBUG3)
options.log_level++;
}
break;
case 'V':
fprintf(stderr, "%s, %s\n",
SSH_RELEASE, SSLeay_version(SSLEAY_VERSION));
if (opt == 'V')
exit(0);
break;
case 'w':
if (options.tun_open == -1)
options.tun_open = SSH_TUNMODE_DEFAULT;
options.tun_local = a2tun(optarg, &options.tun_remote);
if (options.tun_local == SSH_TUNID_ERR) {
fprintf(stderr,
"Bad tun device '%s'\n", optarg);
exit(255);
}
break;
case 'W':
if (stdio_forward_host != NULL)
fatal("stdio forward already specified");
if (muxclient_command != 0)
fatal("Cannot specify stdio forward with -O");
if (parse_forward(&fwd, optarg, 1, 0)) {
stdio_forward_host = fwd.listen_host;
stdio_forward_port = fwd.listen_port;
free(fwd.connect_host);
} else {
fprintf(stderr,
"Bad stdio forwarding specification '%s'\n",
optarg);
exit(255);
}
options.request_tty = REQUEST_TTY_NO;
no_shell_flag = 1;
options.clear_forwardings = 1;
options.exit_on_forward_failure = 1;
break;
case 'q':
options.log_level = SYSLOG_LEVEL_QUIET;
break;
case 'e':
if (optarg[0] == '^' && optarg[2] == 0 &&
(u_char) optarg[1] >= 64 &&
(u_char) optarg[1] < 128)
options.escape_char = (u_char) optarg[1] & 31;
else if (strlen(optarg) == 1)
options.escape_char = (u_char) optarg[0];
else if (strcmp(optarg, "none") == 0)
options.escape_char = SSH_ESCAPECHAR_NONE;
else {
fprintf(stderr, "Bad escape character '%s'.\n",
optarg);
exit(255);
}
break;
case 'c':
if (ciphers_valid(optarg)) {
/* SSH2 only */
options.ciphers = xstrdup(optarg);
options.cipher = SSH_CIPHER_INVALID;
} else {
/* SSH1 only */
options.cipher = cipher_number(optarg);
if (options.cipher == -1) {
fprintf(stderr,
"Unknown cipher type '%s'\n",
optarg);
exit(255);
}
if (options.cipher == SSH_CIPHER_3DES)
options.ciphers = "3des-cbc";
else if (options.cipher == SSH_CIPHER_BLOWFISH)
options.ciphers = "blowfish-cbc";
else
options.ciphers = (char *)-1;
}
break;
case 'm':
if (mac_valid(optarg))
options.macs = xstrdup(optarg);
else {
fprintf(stderr, "Unknown mac type '%s'\n",
optarg);
exit(255);
}
break;
case 'M':
if (options.control_master == SSHCTL_MASTER_YES)
options.control_master = SSHCTL_MASTER_ASK;
else
options.control_master = SSHCTL_MASTER_YES;
break;
case 'p':
options.port = a2port(optarg);
if (options.port <= 0) {
fprintf(stderr, "Bad port '%s'\n", optarg);
exit(255);
}
break;
case 'l':
options.user = optarg;
break;
case 'L':
if (parse_forward(&fwd, optarg, 0, 0))
add_local_forward(&options, &fwd);
else {
fprintf(stderr,
"Bad local forwarding specification '%s'\n",
optarg);
exit(255);
}
break;
case 'R':
if (parse_forward(&fwd, optarg, 0, 1)) {
add_remote_forward(&options, &fwd);
} else {
fprintf(stderr,
"Bad remote forwarding specification "
"'%s'\n", optarg);
exit(255);
}
break;
case 'D':
if (parse_forward(&fwd, optarg, 1, 0)) {
add_local_forward(&options, &fwd);
} else {
fprintf(stderr,
"Bad dynamic forwarding specification "
"'%s'\n", optarg);
exit(255);
}
break;
case 'C':
options.compression = 1;
break;
case 'N':
no_shell_flag = 1;
options.request_tty = REQUEST_TTY_NO;
break;
case 'T':
options.request_tty = REQUEST_TTY_NO;
break;
case 'o':
dummy = 1;
line = xstrdup(optarg);
if (process_config_line(&options, host ? host : "",
line, "command-line", 0, &dummy, SSHCONF_USERCONF)
!= 0)
exit(255);
free(line);
break;
case 's':
subsystem_flag = 1;
break;
case 'S':
if (options.control_path != NULL)
free(options.control_path);
options.control_path = xstrdup(optarg);
break;
case 'b':
options.bind_address = optarg;
break;
case 'F':
config = optarg;
break;
default:
usage();
}
}
ac -= optind;
av += optind;
if (ac > 0 && !host) {
if (strrchr(*av, '@')) {
p = xstrdup(*av);
cp = strrchr(p, '@');
if (cp == NULL || cp == p)
usage();
options.user = p;
*cp = '\0';
host = ++cp;
} else
host = *av;
if (ac > 1) {
optind = optreset = 1;
goto again;
}
ac--, av++;
}
/* Check that we got a host name. */
if (!host)
usage();
OpenSSL_add_all_algorithms();
ERR_load_crypto_strings();
/* Initialize the command to execute on remote host. */
buffer_init(&command);
/*
* Save the command to execute on the remote host in a buffer. There
* is no limit on the length of the command, except by the maximum
* packet size. Also sets the tty flag if there is no command.
*/
if (!ac) {
/* No command specified - execute shell on a tty. */
if (subsystem_flag) {
fprintf(stderr,
"You must specify a subsystem to invoke.\n");
usage();
}
} else {
/* A command has been specified. Store it into the buffer. */
for (i = 0; i < ac; i++) {
if (i)
buffer_append(&command, " ", 1);
buffer_append(&command, av[i], strlen(av[i]));
}
}
/* Cannot fork to background if no command. */
if (fork_after_authentication_flag && buffer_len(&command) == 0 &&
!no_shell_flag)
fatal("Cannot fork into background without a command "
"to execute.");
/*
* Initialize "log" output. Since we are the client all output
* goes to stderr unless otherwise specified by -y or -E.
*/
if (use_syslog && logfile != NULL)
fatal("Can't specify both -y and -E");
if (logfile != NULL) {
log_redirect_stderr_to(logfile);
free(logfile);
}
log_init(argv0,
options.log_level == -1 ? SYSLOG_LEVEL_INFO : options.log_level,
SYSLOG_FACILITY_USER, !use_syslog);
if (debug_flag)
logit("%s, %s", SSH_VERSION, SSLeay_version(SSLEAY_VERSION));
/*
* Read per-user configuration file. Ignore the system wide config
* file if the user specifies a config file on the command line.
*/
if (config != NULL) {
if (strcasecmp(config, "none") != 0 &&
!read_config_file(config, host, &options, SSHCONF_USERCONF))
fatal("Can't open user config file %.100s: "
"%.100s", config, strerror(errno));
} else {
r = snprintf(buf, sizeof buf, "%s/%s", pw->pw_dir,
_PATH_SSH_USER_CONFFILE);
if (r > 0 && (size_t)r < sizeof(buf))
(void)read_config_file(buf, host, &options,
SSHCONF_CHECKPERM|SSHCONF_USERCONF);
/* Read systemwide configuration file after user config. */
(void)read_config_file(_PATH_HOST_CONFIG_FILE, host,
&options, 0);
}
/* Fill configuration defaults. */
fill_default_options(&options);
channel_set_af(options.address_family);
/* reinit */
log_init(argv0, options.log_level, SYSLOG_FACILITY_USER, !use_syslog);
if (options.request_tty == REQUEST_TTY_YES ||
options.request_tty == REQUEST_TTY_FORCE)
tty_flag = 1;
/* Allocate a tty by default if no command specified. */
if (buffer_len(&command) == 0)
tty_flag = options.request_tty != REQUEST_TTY_NO;
/* Force no tty */
if (options.request_tty == REQUEST_TTY_NO || muxclient_command != 0)
tty_flag = 0;
/* Do not allocate a tty if stdin is not a tty. */
if ((!isatty(fileno(stdin)) || stdin_null_flag) &&
options.request_tty != REQUEST_TTY_FORCE) {
if (tty_flag)
logit("Pseudo-terminal will not be allocated because "
"stdin is not a terminal.");
tty_flag = 0;
}
seed_rng();
if (options.user == NULL)
options.user = xstrdup(pw->pw_name);
/* Get default port if port has not been set. */
if (options.port == 0) {
sp = getservbyname(SSH_SERVICE_NAME, "tcp");
options.port = sp ? ntohs(sp->s_port) : SSH_DEFAULT_PORT;
}
/* preserve host name given on command line for %n expansion */
host_arg = host;
if (options.hostname != NULL) {
host = percent_expand(options.hostname,
"h", host, (char *)NULL);
}
if (gethostname(thishost, sizeof(thishost)) == -1)
fatal("gethostname: %s", strerror(errno));
strlcpy(shorthost, thishost, sizeof(shorthost));
shorthost[strcspn(thishost, ".")] = '\0';
snprintf(portstr, sizeof(portstr), "%d", options.port);
if (options.local_command != NULL) {
debug3("expanding LocalCommand: %s", options.local_command);
cp = options.local_command;
options.local_command = percent_expand(cp, "d", pw->pw_dir,
"h", host, "l", thishost, "n", host_arg, "r", options.user,
"p", portstr, "u", pw->pw_name, "L", shorthost,
(char *)NULL);
debug3("expanded LocalCommand: %s", options.local_command);
free(cp);
}
/* force lowercase for hostkey matching */
if (options.host_key_alias != NULL) {
for (p = options.host_key_alias; *p; p++)
if (isupper(*p))
*p = (char)tolower(*p);
}
if (options.proxy_command != NULL &&
strcmp(options.proxy_command, "none") == 0) {
free(options.proxy_command);
options.proxy_command = NULL;
}
if (options.control_path != NULL &&
strcmp(options.control_path, "none") == 0) {
free(options.control_path);
options.control_path = NULL;
}
if (options.control_path != NULL) {
cp = tilde_expand_filename(options.control_path,
original_real_uid);
free(options.control_path);
options.control_path = percent_expand(cp, "h", host,
"l", thishost, "n", host_arg, "r", options.user,
"p", portstr, "u", pw->pw_name, "L", shorthost,
(char *)NULL);
free(cp);
}
if (muxclient_command != 0 && options.control_path == NULL)
fatal("No ControlPath specified for \"-O\" command");
if (options.control_path != NULL)
muxclient(options.control_path);
timeout_ms = options.connection_timeout * 1000;
/* Open a connection to the remote host. */
if (ssh_connect(host, &hostaddr, options.port,
options.address_family, options.connection_attempts, &timeout_ms,
options.tcp_keep_alive,
#ifdef HAVE_CYGWIN
options.use_privileged_port,
#else
original_effective_uid == 0 && options.use_privileged_port,
#endif
options.proxy_command) != 0)
exit(255);
if (timeout_ms > 0)
debug3("timeout: %d ms remain after connect", timeout_ms);
/*
* If we successfully made the connection, load the host private key
* in case we will need it later for combined rsa-rhosts
* authentication. This must be done before releasing extra
* privileges, because the file is only readable by root.
* If we cannot access the private keys, load the public keys
* instead and try to execute the ssh-keysign helper instead.
*/
sensitive_data.nkeys = 0;
sensitive_data.keys = NULL;
sensitive_data.external_keysign = 0;
if (options.rhosts_rsa_authentication ||
options.hostbased_authentication) {
sensitive_data.nkeys = 7;
sensitive_data.keys = xcalloc(sensitive_data.nkeys,
sizeof(Key));
for (i = 0; i < sensitive_data.nkeys; i++)
sensitive_data.keys[i] = NULL;
PRIV_START;
sensitive_data.keys[0] = key_load_private_type(KEY_RSA1,
_PATH_HOST_KEY_FILE, "", NULL, NULL);
sensitive_data.keys[1] = key_load_private_cert(KEY_DSA,
_PATH_HOST_DSA_KEY_FILE, "", NULL);
#ifdef OPENSSL_HAS_ECC
sensitive_data.keys[2] = key_load_private_cert(KEY_ECDSA,
_PATH_HOST_ECDSA_KEY_FILE, "", NULL);
#endif
sensitive_data.keys[3] = key_load_private_cert(KEY_RSA,
_PATH_HOST_RSA_KEY_FILE, "", NULL);
sensitive_data.keys[4] = key_load_private_type(KEY_DSA,
_PATH_HOST_DSA_KEY_FILE, "", NULL, NULL);
#ifdef OPENSSL_HAS_ECC
sensitive_data.keys[5] = key_load_private_type(KEY_ECDSA,
_PATH_HOST_ECDSA_KEY_FILE, "", NULL, NULL);
#endif
sensitive_data.keys[6] = key_load_private_type(KEY_RSA,
_PATH_HOST_RSA_KEY_FILE, "", NULL, NULL);
PRIV_END;
if (options.hostbased_authentication == 1 &&
sensitive_data.keys[0] == NULL &&
sensitive_data.keys[4] == NULL &&
sensitive_data.keys[5] == NULL &&
sensitive_data.keys[6] == NULL) {
sensitive_data.keys[1] = key_load_cert(
_PATH_HOST_DSA_KEY_FILE);
#ifdef OPENSSL_HAS_ECC
sensitive_data.keys[2] = key_load_cert(
_PATH_HOST_ECDSA_KEY_FILE);
#endif
sensitive_data.keys[3] = key_load_cert(
_PATH_HOST_RSA_KEY_FILE);
sensitive_data.keys[4] = key_load_public(
_PATH_HOST_DSA_KEY_FILE, NULL);
#ifdef OPENSSL_HAS_ECC
sensitive_data.keys[5] = key_load_public(
_PATH_HOST_ECDSA_KEY_FILE, NULL);
#endif
sensitive_data.keys[6] = key_load_public(
_PATH_HOST_RSA_KEY_FILE, NULL);
sensitive_data.external_keysign = 1;
}
}
/*
* Get rid of any extra privileges that we may have. We will no
* longer need them. Also, extra privileges could make it very hard
* to read identity files and other non-world-readable files from the
* user's home directory if it happens to be on a NFS volume where
* root is mapped to nobody.
*/
if (original_effective_uid == 0) {
PRIV_START;
permanently_set_uid(pw);
}
/*
* Now that we are back to our own permissions, create ~/.ssh
* directory if it doesn't already exist.
*/
if (config == NULL) {
r = snprintf(buf, sizeof buf, "%s/%s",
strcmp(pw->pw_dir, "/") ? pw->pw_dir : _PATH_ROOT_HOME_PREFIX,
_PATH_SSH_USER_DIR);
if (r > 0 && (size_t)r < sizeof(buf) && stat(buf, &st) < 0) {
#ifdef WITH_SELINUX
ssh_selinux_setfscreatecon(buf);
#endif
if (mkdir(buf, 0700) < 0)
error("Could not create directory '%.200s'.",
buf);
#ifdef WITH_SELINUX
ssh_selinux_setfscreatecon(NULL);
#endif
}
}
/* load options.identity_files */
load_public_identity_files();
/* Expand ~ in known host file names. */
tilde_expand_paths(options.system_hostfiles,
options.num_system_hostfiles);
tilde_expand_paths(options.user_hostfiles, options.num_user_hostfiles);
signal(SIGPIPE, SIG_IGN); /* ignore SIGPIPE early */
signal(SIGCHLD, main_sigchld_handler);
/* Log into the remote system. Never returns if the login fails. */
ssh_login(&sensitive_data, host, (struct sockaddr *)&hostaddr,
options.port, pw, timeout_ms);
if (packet_connection_is_on_socket()) {
verbose("Authenticated to %s ([%s]:%d).", host,
get_remote_ipaddr(), get_remote_port());
} else {
verbose("Authenticated to %s (via proxy).", host);
}
/* We no longer need the private host keys. Clear them now. */
if (sensitive_data.nkeys != 0) {
for (i = 0; i < sensitive_data.nkeys; i++) {
if (sensitive_data.keys[i] != NULL) {
/* Destroys contents safely */
debug3("clear hostkey %d", i);
key_free(sensitive_data.keys[i]);
sensitive_data.keys[i] = NULL;
}
}
free(sensitive_data.keys);
}
for (i = 0; i < options.num_identity_files; i++) {
free(options.identity_files[i]);
options.identity_files[i] = NULL;
if (options.identity_keys[i]) {
key_free(options.identity_keys[i]);
options.identity_keys[i] = NULL;
}
}
exit_status = compat20 ? ssh_session2() : ssh_session();
packet_close();
if (options.control_path != NULL && muxserver_sock != -1)
unlink(options.control_path);
/* Kill ProxyCommand if it is running. */
ssh_kill_proxy_command();
return exit_status;
}
void
fill_default_options(Options * options)
{
int len;
if (options->forward_agent == -1)
options->forward_agent = 0;
if (options->forward_x11 == -1)
options->forward_x11 = 0;
if (options->forward_x11_trusted == -1)
options->forward_x11_trusted = 0;
if (options->forward_x11_timeout == -1)
options->forward_x11_timeout = 1200;
if (options->exit_on_forward_failure == -1)
options->exit_on_forward_failure = 0;
if (options->xauth_location == NULL)
options->xauth_location = _PATH_XAUTH;
if (options->gateway_ports == -1)
options->gateway_ports = 0;
if (options->use_privileged_port == -1)
options->use_privileged_port = 0;
if (options->rsa_authentication == -1)
options->rsa_authentication = 1;
if (options->pubkey_authentication == -1)
options->pubkey_authentication = 1;
if (options->challenge_response_authentication == -1)
options->challenge_response_authentication = 1;
if (options->gss_authentication == -1)
options->gss_authentication = 0;
if (options->gss_deleg_creds == -1)
options->gss_deleg_creds = 0;
if (options->password_authentication == -1)
options->password_authentication = 1;
if (options->kbd_interactive_authentication == -1)
options->kbd_interactive_authentication = 1;
if (options->rhosts_rsa_authentication == -1)
options->rhosts_rsa_authentication = 0;
if (options->hostbased_authentication == -1)
options->hostbased_authentication = 0;
if (options->batch_mode == -1)
options->batch_mode = 0;
if (options->check_host_ip == -1)
options->check_host_ip = 0;
if (options->strict_host_key_checking == -1)
options->strict_host_key_checking = 2; /* 2 is default */
if (options->compression == -1)
options->compression = 0;
if (options->tcp_keep_alive == -1)
options->tcp_keep_alive = 1;
if (options->compression_level == -1)
options->compression_level = 6;
if (options->port == -1)
options->port = 0; /* Filled in ssh_connect. */
if (options->address_family == -1)
options->address_family = AF_UNSPEC;
if (options->connection_attempts == -1)
options->connection_attempts = 1;
if (options->number_of_password_prompts == -1)
options->number_of_password_prompts = 3;
/* Selected in ssh_login(). */
if (options->cipher == -1)
options->cipher = SSH_CIPHER_NOT_SET;
/* options->ciphers, default set in myproposals.h */
/* options->macs, default set in myproposals.h */
/* options->kex_algorithms, default set in myproposals.h */
/* options->hostkeyalgorithms, default set in myproposals.h */
if (options->protocol == SSH_PROTO_UNKNOWN)
options->protocol = SSH_PROTO_2;
if (options->num_identity_files == 0) {
if (options->protocol & SSH_PROTO_1) {
add_identity_file(options, "~/",
_PATH_SSH_CLIENT_IDENTITY, 0);
}
if (options->protocol & SSH_PROTO_2) {
add_identity_file(options, "~/",
_PATH_SSH_CLIENT_ID_RSA, 0);
add_identity_file(options, "~/",
_PATH_SSH_CLIENT_ID_DSA, 0);
#ifdef OPENSSL_HAS_ECC
add_identity_file(options, "~/",
_PATH_SSH_CLIENT_ID_ECDSA, 0);
#endif
}
}
if (options->escape_char == -1)
options->escape_char = '~';
if (options->num_system_hostfiles == 0) {
options->system_hostfiles[options->num_system_hostfiles++] =
xstrdup(_PATH_SSH_SYSTEM_HOSTFILE);
options->system_hostfiles[options->num_system_hostfiles++] =
xstrdup(_PATH_SSH_SYSTEM_HOSTFILE2);
}
if (options->num_user_hostfiles == 0) {
options->user_hostfiles[options->num_user_hostfiles++] =
xstrdup(_PATH_SSH_USER_HOSTFILE);
options->user_hostfiles[options->num_user_hostfiles++] =
xstrdup(_PATH_SSH_USER_HOSTFILE2);
}
if (options->log_level == SYSLOG_LEVEL_NOT_SET)
options->log_level = SYSLOG_LEVEL_INFO;
if (options->clear_forwardings == 1)
clear_forwardings(options);
if (options->no_host_authentication_for_localhost == - 1)
options->no_host_authentication_for_localhost = 0;
if (options->identities_only == -1)
options->identities_only = 0;
if (options->enable_ssh_keysign == -1)
options->enable_ssh_keysign = 0;
if (options->rekey_limit == -1)
options->rekey_limit = 0;
if (options->verify_host_key_dns == -1)
options->verify_host_key_dns = 0;
if (options->server_alive_interval == -1)
options->server_alive_interval = 0;
if (options->server_alive_count_max == -1)
options->server_alive_count_max = 3;
if (options->control_master == -1)
options->control_master = 0;
if (options->control_persist == -1) {
options->control_persist = 0;
options->control_persist_timeout = 0;
}
if (options->hash_known_hosts == -1)
options->hash_known_hosts = 0;
if (options->tun_open == -1)
options->tun_open = SSH_TUNMODE_NO;
if (options->tun_local == -1)
options->tun_local = SSH_TUNID_ANY;
if (options->tun_remote == -1)
options->tun_remote = SSH_TUNID_ANY;
if (options->permit_local_command == -1)
options->permit_local_command = 0;
if (options->use_roaming == -1)
options->use_roaming = 1;
if (options->visual_host_key == -1)
options->visual_host_key = 0;
if (options->zero_knowledge_password_authentication == -1)
options->zero_knowledge_password_authentication = 0;
if (options->ip_qos_interactive == -1)
options->ip_qos_interactive = IPTOS_LOWDELAY;
if (options->ip_qos_bulk == -1)
options->ip_qos_bulk = IPTOS_THROUGHPUT;
if (options->request_tty == -1)
options->request_tty = REQUEST_TTY_AUTO;
/* options->local_command should not be set by default */
/* options->proxy_command should not be set by default */
/* options->user will be set in the main program if appropriate */
/* options->hostname will be set in the main program if appropriate */
/* options->host_key_alias should not be set by default */
/* options->preferred_authentications will be set in ssh */
if (options->version_addendum == NULL)
options->version_addendum = xstrdup(SSH_VERSION_FREEBSD);
if (options->hpn_disabled == -1)
options->hpn_disabled = 0;
if (options->hpn_buffer_size > -1)
{
u_int maxlen;
/* If a user tries to set the size to 0 set it to 1KB. */
if (options->hpn_buffer_size == 0)
options->hpn_buffer_size = 1024;
/* Limit the buffer to BUFFER_MAX_LEN. */
maxlen = buffer_get_max_len();
if (options->hpn_buffer_size > (maxlen / 1024)) {
debug("User requested buffer larger than %ub: %ub. "
"Request reverted to %ub", maxlen,
options->hpn_buffer_size * 1024, maxlen);
options->hpn_buffer_size = maxlen;
}
debug("hpn_buffer_size set to %d", options->hpn_buffer_size);
}
if (options->tcp_rcv_buf == 0)
options->tcp_rcv_buf = 1;
if (options->tcp_rcv_buf > -1)
options->tcp_rcv_buf *= 1024;
if (options->tcp_rcv_buf_poll == -1)
options->tcp_rcv_buf_poll = 1;
#ifdef NONE_CIPHER_ENABLED
/* options->none_enabled must not be set by default */
if (options->none_switch == -1)
options->none_switch = 0;
#endif
}
int
process_config_line(Options *options, const char *host,
char *line, const char *filename, int linenum,
int *activep, int userconfig)
{
char *s, **charptr, *endofnumber, *keyword, *arg, *arg2;
char **cpptr, fwdarg[256];
u_int *uintptr, max_entries = 0;
int negated, opcode, *intptr, value, value2, scale;
LogLevel *log_level_ptr;
long long orig, val64;
size_t len;
Forward fwd;
/* Strip trailing whitespace */
for (len = strlen(line) - 1; len > 0; len--) {
if (strchr(WHITESPACE, line[len]) == NULL)
break;
line[len] = '\0';
}
s = line;
/* Get the keyword. (Each line is supposed to begin with a keyword). */
if ((keyword = strdelim(&s)) == NULL)
return 0;
/* Ignore leading whitespace. */
if (*keyword == '\0')
keyword = strdelim(&s);
if (keyword == NULL || !*keyword || *keyword == '\n' || *keyword == '#')
return 0;
opcode = parse_token(keyword, filename, linenum);
switch (opcode) {
case oBadOption:
/* don't panic, but count bad options */
return -1;
/* NOTREACHED */
case oConnectTimeout:
intptr = &options->connection_timeout;
parse_time:
arg = strdelim(&s);
if (!arg || *arg == '\0')
fatal("%s line %d: missing time value.",
filename, linenum);
if ((value = convtime(arg)) == -1)
fatal("%s line %d: invalid time value.",
filename, linenum);
if (*activep && *intptr == -1)
*intptr = value;
break;
case oForwardAgent:
intptr = &options->forward_agent;
parse_flag:
arg = strdelim(&s);
if (!arg || *arg == '\0')
fatal("%.200s line %d: Missing yes/no argument.", filename, linenum);
value = 0; /* To avoid compiler warning... */
if (strcmp(arg, "yes") == 0 || strcmp(arg, "true") == 0)
value = 1;
else if (strcmp(arg, "no") == 0 || strcmp(arg, "false") == 0)
value = 0;
else
fatal("%.200s line %d: Bad yes/no argument.", filename, linenum);
if (*activep && *intptr == -1)
*intptr = value;
break;
case oForwardX11:
intptr = &options->forward_x11;
goto parse_flag;
case oForwardX11Trusted:
intptr = &options->forward_x11_trusted;
goto parse_flag;
case oForwardX11Timeout:
intptr = &options->forward_x11_timeout;
goto parse_time;
case oGatewayPorts:
intptr = &options->gateway_ports;
goto parse_flag;
case oExitOnForwardFailure:
intptr = &options->exit_on_forward_failure;
goto parse_flag;
case oUsePrivilegedPort:
intptr = &options->use_privileged_port;
goto parse_flag;
case oPasswordAuthentication:
intptr = &options->password_authentication;
goto parse_flag;
case oZeroKnowledgePasswordAuthentication:
intptr = &options->zero_knowledge_password_authentication;
goto parse_flag;
case oKbdInteractiveAuthentication:
intptr = &options->kbd_interactive_authentication;
goto parse_flag;
case oKbdInteractiveDevices:
charptr = &options->kbd_interactive_devices;
goto parse_string;
case oPubkeyAuthentication:
intptr = &options->pubkey_authentication;
goto parse_flag;
case oRSAAuthentication:
intptr = &options->rsa_authentication;
goto parse_flag;
case oRhostsRSAAuthentication:
intptr = &options->rhosts_rsa_authentication;
goto parse_flag;
case oHostbasedAuthentication:
intptr = &options->hostbased_authentication;
goto parse_flag;
case oChallengeResponseAuthentication:
intptr = &options->challenge_response_authentication;
goto parse_flag;
case oGssAuthentication:
intptr = &options->gss_authentication;
goto parse_flag;
case oGssDelegateCreds:
intptr = &options->gss_deleg_creds;
goto parse_flag;
case oBatchMode:
intptr = &options->batch_mode;
goto parse_flag;
case oCheckHostIP:
intptr = &options->check_host_ip;
goto parse_flag;
case oVerifyHostKeyDNS:
intptr = &options->verify_host_key_dns;
goto parse_yesnoask;
case oStrictHostKeyChecking:
intptr = &options->strict_host_key_checking;
parse_yesnoask:
arg = strdelim(&s);
if (!arg || *arg == '\0')
fatal("%.200s line %d: Missing yes/no/ask argument.",
filename, linenum);
value = 0; /* To avoid compiler warning... */
if (strcmp(arg, "yes") == 0 || strcmp(arg, "true") == 0)
value = 1;
else if (strcmp(arg, "no") == 0 || strcmp(arg, "false") == 0)
value = 0;
else if (strcmp(arg, "ask") == 0)
value = 2;
else
fatal("%.200s line %d: Bad yes/no/ask argument.", filename, linenum);
if (*activep && *intptr == -1)
*intptr = value;
break;
case oCompression:
intptr = &options->compression;
goto parse_flag;
case oTCPKeepAlive:
intptr = &options->tcp_keep_alive;
goto parse_flag;
case oNoHostAuthenticationForLocalhost:
intptr = &options->no_host_authentication_for_localhost;
goto parse_flag;
case oNumberOfPasswordPrompts:
intptr = &options->number_of_password_prompts;
goto parse_int;
case oCompressionLevel:
intptr = &options->compression_level;
goto parse_int;
case oRekeyLimit:
arg = strdelim(&s);
if (!arg || *arg == '\0')
fatal("%.200s line %d: Missing argument.", filename, linenum);
if (arg[0] < '0' || arg[0] > '9')
fatal("%.200s line %d: Bad number.", filename, linenum);
orig = val64 = strtoll(arg, &endofnumber, 10);
if (arg == endofnumber)
fatal("%.200s line %d: Bad number.", filename, linenum);
switch (toupper(*endofnumber)) {
case '\0':
scale = 1;
break;
case 'K':
scale = 1<<10;
break;
case 'M':
scale = 1<<20;
break;
case 'G':
scale = 1<<30;
break;
default:
fatal("%.200s line %d: Invalid RekeyLimit suffix",
filename, linenum);
}
val64 *= scale;
/* detect integer wrap and too-large limits */
if ((val64 / scale) != orig || val64 > UINT_MAX)
fatal("%.200s line %d: RekeyLimit too large",
filename, linenum);
if (val64 < 16)
fatal("%.200s line %d: RekeyLimit too small",
filename, linenum);
if (*activep && options->rekey_limit == -1)
options->rekey_limit = (u_int32_t)val64;
break;
case oIdentityFile:
arg = strdelim(&s);
if (!arg || *arg == '\0')
fatal("%.200s line %d: Missing argument.", filename, linenum);
if (*activep) {
intptr = &options->num_identity_files;
if (*intptr >= SSH_MAX_IDENTITY_FILES)
fatal("%.200s line %d: Too many identity files specified (max %d).",
filename, linenum, SSH_MAX_IDENTITY_FILES);
add_identity_file(options, NULL, arg, userconfig);
}
break;
case oXAuthLocation:
charptr=&options->xauth_location;
goto parse_string;
case oUser:
charptr = &options->user;
parse_string:
arg = strdelim(&s);
if (!arg || *arg == '\0')
fatal("%.200s line %d: Missing argument.",
filename, linenum);
if (*activep && *charptr == NULL)
*charptr = xstrdup(arg);
break;
case oGlobalKnownHostsFile:
cpptr = (char **)&options->system_hostfiles;
uintptr = &options->num_system_hostfiles;
max_entries = SSH_MAX_HOSTS_FILES;
parse_char_array:
if (*activep && *uintptr == 0) {
while ((arg = strdelim(&s)) != NULL && *arg != '\0') {
if ((*uintptr) >= max_entries)
fatal("%s line %d: "
"too many authorized keys files.",
filename, linenum);
cpptr[(*uintptr)++] = xstrdup(arg);
}
}
return 0;
case oUserKnownHostsFile:
cpptr = (char **)&options->user_hostfiles;
uintptr = &options->num_user_hostfiles;
max_entries = SSH_MAX_HOSTS_FILES;
goto parse_char_array;
case oHostName:
charptr = &options->hostname;
goto parse_string;
case oHostKeyAlias:
charptr = &options->host_key_alias;
goto parse_string;
case oPreferredAuthentications:
charptr = &options->preferred_authentications;
goto parse_string;
case oBindAddress:
charptr = &options->bind_address;
goto parse_string;
case oPKCS11Provider:
charptr = &options->pkcs11_provider;
goto parse_string;
case oProxyCommand:
charptr = &options->proxy_command;
parse_command:
if (s == NULL)
fatal("%.200s line %d: Missing argument.", filename, linenum);
len = strspn(s, WHITESPACE "=");
if (*activep && *charptr == NULL)
*charptr = xstrdup(s + len);
return 0;
case oPort:
intptr = &options->port;
parse_int:
arg = strdelim(&s);
if (!arg || *arg == '\0')
fatal("%.200s line %d: Missing argument.", filename, linenum);
if (arg[0] < '0' || arg[0] > '9')
fatal("%.200s line %d: Bad number.", filename, linenum);
/* Octal, decimal, or hex format? */
value = strtol(arg, &endofnumber, 0);
if (arg == endofnumber)
fatal("%.200s line %d: Bad number.", filename, linenum);
if (*activep && *intptr == -1)
*intptr = value;
break;
case oConnectionAttempts:
intptr = &options->connection_attempts;
goto parse_int;
case oCipher:
intptr = &options->cipher;
arg = strdelim(&s);
if (!arg || *arg == '\0')
fatal("%.200s line %d: Missing argument.", filename, linenum);
value = cipher_number(arg);
if (value == -1)
fatal("%.200s line %d: Bad cipher '%s'.",
filename, linenum, arg ? arg : "<NONE>");
if (*activep && *intptr == -1)
*intptr = value;
break;
case oCiphers:
arg = strdelim(&s);
if (!arg || *arg == '\0')
fatal("%.200s line %d: Missing argument.", filename, linenum);
if (!ciphers_valid(arg))
fatal("%.200s line %d: Bad SSH2 cipher spec '%s'.",
filename, linenum, arg ? arg : "<NONE>");
if (*activep && options->ciphers == NULL)
options->ciphers = xstrdup(arg);
break;
case oMacs:
arg = strdelim(&s);
if (!arg || *arg == '\0')
fatal("%.200s line %d: Missing argument.", filename, linenum);
if (!mac_valid(arg))
fatal("%.200s line %d: Bad SSH2 Mac spec '%s'.",
filename, linenum, arg ? arg : "<NONE>");
if (*activep && options->macs == NULL)
options->macs = xstrdup(arg);
break;
case oKexAlgorithms:
arg = strdelim(&s);
if (!arg || *arg == '\0')
fatal("%.200s line %d: Missing argument.",
filename, linenum);
if (!kex_names_valid(arg))
fatal("%.200s line %d: Bad SSH2 KexAlgorithms '%s'.",
filename, linenum, arg ? arg : "<NONE>");
if (*activep && options->kex_algorithms == NULL)
options->kex_algorithms = xstrdup(arg);
break;
case oHostKeyAlgorithms:
arg = strdelim(&s);
if (!arg || *arg == '\0')
fatal("%.200s line %d: Missing argument.", filename, linenum);
if (!key_names_valid2(arg))
fatal("%.200s line %d: Bad protocol 2 host key algorithms '%s'.",
filename, linenum, arg ? arg : "<NONE>");
if (*activep && options->hostkeyalgorithms == NULL)
options->hostkeyalgorithms = xstrdup(arg);
break;
case oProtocol:
intptr = &options->protocol;
arg = strdelim(&s);
if (!arg || *arg == '\0')
fatal("%.200s line %d: Missing argument.", filename, linenum);
value = proto_spec(arg);
if (value == SSH_PROTO_UNKNOWN)
fatal("%.200s line %d: Bad protocol spec '%s'.",
filename, linenum, arg ? arg : "<NONE>");
if (*activep && *intptr == SSH_PROTO_UNKNOWN)
*intptr = value;
break;
case oLogLevel:
log_level_ptr = &options->log_level;
arg = strdelim(&s);
value = log_level_number(arg);
if (value == SYSLOG_LEVEL_NOT_SET)
fatal("%.200s line %d: unsupported log level '%s'",
filename, linenum, arg ? arg : "<NONE>");
if (*activep && *log_level_ptr == SYSLOG_LEVEL_NOT_SET)
*log_level_ptr = (LogLevel) value;
break;
case oLocalForward:
case oRemoteForward:
case oDynamicForward:
arg = strdelim(&s);
if (arg == NULL || *arg == '\0')
fatal("%.200s line %d: Missing port argument.",
filename, linenum);
if (opcode == oLocalForward ||
opcode == oRemoteForward) {
arg2 = strdelim(&s);
if (arg2 == NULL || *arg2 == '\0')
fatal("%.200s line %d: Missing target argument.",
filename, linenum);
/* construct a string for parse_forward */
snprintf(fwdarg, sizeof(fwdarg), "%s:%s", arg, arg2);
} else if (opcode == oDynamicForward) {
strlcpy(fwdarg, arg, sizeof(fwdarg));
}
if (parse_forward(&fwd, fwdarg,
opcode == oDynamicForward ? 1 : 0,
opcode == oRemoteForward ? 1 : 0) == 0)
fatal("%.200s line %d: Bad forwarding specification.",
filename, linenum);
if (*activep) {
if (opcode == oLocalForward ||
opcode == oDynamicForward)
add_local_forward(options, &fwd);
else if (opcode == oRemoteForward)
add_remote_forward(options, &fwd);
}
break;
case oClearAllForwardings:
intptr = &options->clear_forwardings;
goto parse_flag;
case oHost:
*activep = 0;
arg2 = NULL;
while ((arg = strdelim(&s)) != NULL && *arg != '\0') {
negated = *arg == '!';
if (negated)
arg++;
if (match_pattern(host, arg)) {
if (negated) {
debug("%.200s line %d: Skipping Host "
"block because of negated match "
"for %.100s", filename, linenum,
arg);
*activep = 0;
break;
}
if (!*activep)
arg2 = arg; /* logged below */
*activep = 1;
}
}
if (*activep)
debug("%.200s line %d: Applying options for %.100s",
filename, linenum, arg2);
/* Avoid garbage check below, as strdelim is done. */
return 0;
case oEscapeChar:
intptr = &options->escape_char;
arg = strdelim(&s);
if (!arg || *arg == '\0')
fatal("%.200s line %d: Missing argument.", filename, linenum);
if (arg[0] == '^' && arg[2] == 0 &&
(u_char) arg[1] >= 64 && (u_char) arg[1] < 128)
value = (u_char) arg[1] & 31;
else if (strlen(arg) == 1)
value = (u_char) arg[0];
else if (strcmp(arg, "none") == 0)
value = SSH_ESCAPECHAR_NONE;
else {
fatal("%.200s line %d: Bad escape character.",
filename, linenum);
/* NOTREACHED */
value = 0; /* Avoid compiler warning. */
}
if (*activep && *intptr == -1)
*intptr = value;
break;
case oAddressFamily:
arg = strdelim(&s);
if (!arg || *arg == '\0')
fatal("%s line %d: missing address family.",
filename, linenum);
intptr = &options->address_family;
if (strcasecmp(arg, "inet") == 0)
value = AF_INET;
else if (strcasecmp(arg, "inet6") == 0)
value = AF_INET6;
else if (strcasecmp(arg, "any") == 0)
value = AF_UNSPEC;
else
fatal("Unsupported AddressFamily \"%s\"", arg);
if (*activep && *intptr == -1)
*intptr = value;
break;
case oEnableSSHKeysign:
intptr = &options->enable_ssh_keysign;
goto parse_flag;
case oIdentitiesOnly:
intptr = &options->identities_only;
goto parse_flag;
case oServerAliveInterval:
intptr = &options->server_alive_interval;
goto parse_time;
case oServerAliveCountMax:
intptr = &options->server_alive_count_max;
goto parse_int;
case oSendEnv:
while ((arg = strdelim(&s)) != NULL && *arg != '\0') {
if (strchr(arg, '=') != NULL)
fatal("%s line %d: Invalid environment name.",
filename, linenum);
if (!*activep)
continue;
if (options->num_send_env >= MAX_SEND_ENV)
fatal("%s line %d: too many send env.",
filename, linenum);
options->send_env[options->num_send_env++] =
xstrdup(arg);
}
break;
case oControlPath:
charptr = &options->control_path;
goto parse_string;
case oControlMaster:
intptr = &options->control_master;
arg = strdelim(&s);
if (!arg || *arg == '\0')
fatal("%.200s line %d: Missing ControlMaster argument.",
filename, linenum);
value = 0; /* To avoid compiler warning... */
if (strcmp(arg, "yes") == 0 || strcmp(arg, "true") == 0)
value = SSHCTL_MASTER_YES;
else if (strcmp(arg, "no") == 0 || strcmp(arg, "false") == 0)
value = SSHCTL_MASTER_NO;
else if (strcmp(arg, "auto") == 0)
value = SSHCTL_MASTER_AUTO;
else if (strcmp(arg, "ask") == 0)
value = SSHCTL_MASTER_ASK;
else if (strcmp(arg, "autoask") == 0)
value = SSHCTL_MASTER_AUTO_ASK;
else
fatal("%.200s line %d: Bad ControlMaster argument.",
filename, linenum);
if (*activep && *intptr == -1)
*intptr = value;
break;
case oControlPersist:
/* no/false/yes/true, or a time spec */
intptr = &options->control_persist;
arg = strdelim(&s);
if (!arg || *arg == '\0')
fatal("%.200s line %d: Missing ControlPersist"
" argument.", filename, linenum);
value = 0;
value2 = 0; /* timeout */
if (strcmp(arg, "no") == 0 || strcmp(arg, "false") == 0)
value = 0;
else if (strcmp(arg, "yes") == 0 || strcmp(arg, "true") == 0)
value = 1;
else if ((value2 = convtime(arg)) >= 0)
value = 1;
else
fatal("%.200s line %d: Bad ControlPersist argument.",
filename, linenum);
if (*activep && *intptr == -1) {
*intptr = value;
options->control_persist_timeout = value2;
}
break;
case oHashKnownHosts:
intptr = &options->hash_known_hosts;
goto parse_flag;
case oTunnel:
intptr = &options->tun_open;
arg = strdelim(&s);
if (!arg || *arg == '\0')
fatal("%s line %d: Missing yes/point-to-point/"
"ethernet/no argument.", filename, linenum);
value = 0; /* silence compiler */
if (strcasecmp(arg, "ethernet") == 0)
value = SSH_TUNMODE_ETHERNET;
else if (strcasecmp(arg, "point-to-point") == 0)
value = SSH_TUNMODE_POINTOPOINT;
else if (strcasecmp(arg, "yes") == 0)
value = SSH_TUNMODE_DEFAULT;
else if (strcasecmp(arg, "no") == 0)
value = SSH_TUNMODE_NO;
else
fatal("%s line %d: Bad yes/point-to-point/ethernet/"
"no argument: %s", filename, linenum, arg);
if (*activep)
*intptr = value;
break;
case oTunnelDevice:
arg = strdelim(&s);
if (!arg || *arg == '\0')
fatal("%.200s line %d: Missing argument.", filename, linenum);
value = a2tun(arg, &value2);
if (value == SSH_TUNID_ERR)
fatal("%.200s line %d: Bad tun device.", filename, linenum);
if (*activep) {
options->tun_local = value;
options->tun_remote = value2;
}
break;
case oLocalCommand:
charptr = &options->local_command;
goto parse_command;
case oPermitLocalCommand:
intptr = &options->permit_local_command;
goto parse_flag;
case oVisualHostKey:
intptr = &options->visual_host_key;
goto parse_flag;
case oIPQoS:
arg = strdelim(&s);
if ((value = parse_ipqos(arg)) == -1)
fatal("%s line %d: Bad IPQoS value: %s",
filename, linenum, arg);
arg = strdelim(&s);
if (arg == NULL)
value2 = value;
else if ((value2 = parse_ipqos(arg)) == -1)
fatal("%s line %d: Bad IPQoS value: %s",
filename, linenum, arg);
if (*activep) {
options->ip_qos_interactive = value;
options->ip_qos_bulk = value2;
}
break;
case oUseRoaming:
intptr = &options->use_roaming;
goto parse_flag;
case oRequestTTY:
arg = strdelim(&s);
if (!arg || *arg == '\0')
fatal("%s line %d: missing argument.",
filename, linenum);
intptr = &options->request_tty;
if (strcasecmp(arg, "yes") == 0)
value = REQUEST_TTY_YES;
else if (strcasecmp(arg, "no") == 0)
value = REQUEST_TTY_NO;
else if (strcasecmp(arg, "force") == 0)
value = REQUEST_TTY_FORCE;
else if (strcasecmp(arg, "auto") == 0)
value = REQUEST_TTY_AUTO;
else
fatal("Unsupported RequestTTY \"%s\"", arg);
if (*activep && *intptr == -1)
*intptr = value;
break;
case oHPNDisabled:
intptr = &options->hpn_disabled;
goto parse_flag;
case oHPNBufferSize:
intptr = &options->hpn_buffer_size;
goto parse_int;
case oTcpRcvBufPoll:
intptr = &options->tcp_rcv_buf_poll;
goto parse_flag;
case oTcpRcvBuf:
intptr = &options->tcp_rcv_buf;
goto parse_int;
#ifdef NONE_CIPHER_ENABLED
case oNoneEnabled:
intptr = &options->none_enabled;
goto parse_flag;
/*
* We check to see if the command comes from the command line or not.
* If it does then enable it otherwise fail. NONE must never be a
* default configuration.
*/
case oNoneSwitch:
if (strcmp(filename,"command-line") == 0) {
intptr = &options->none_switch;
goto parse_flag;
} else {
debug("NoneSwitch directive found in %.200s.",
filename);
error("NoneSwitch is found in %.200s.\n"
"You may only use this configuration option "
"from the command line", filename);
error("Continuing...");
return 0;
}
#endif
case oVersionAddendum:
if (s == NULL)
fatal("%.200s line %d: Missing argument.", filename,
linenum);
len = strspn(s, WHITESPACE);
if (*activep && options->version_addendum == NULL) {
if (strcasecmp(s + len, "none") == 0)
options->version_addendum = xstrdup("");
else if (strchr(s + len, '\r') != NULL)
fatal("%.200s line %d: Invalid argument",
filename, linenum);
else
options->version_addendum = xstrdup(s + len);
}
return 0;
case oDeprecated:
debug("%s line %d: Deprecated option \"%s\"",
filename, linenum, keyword);
return 0;
case oUnsupported:
error("%s line %d: Unsupported option \"%s\"",
filename, linenum, keyword);
return 0;
default:
fatal("process_config_line: Unimplemented opcode %d", opcode);
}
/* Check that there is no garbage at end of line. */
if ((arg = strdelim(&s)) != NULL && *arg != '\0') {
fatal("%.200s line %d: garbage at end of line; \"%.200s\".",
filename, linenum, arg);
}
return 0;
}
void
fill_default_options(Options * options)
{
if (options->forward_agent == -1)
options->forward_agent = 0;
if (options->forward_x11 == -1)
options->forward_x11 = 0;
if (options->forward_x11_trusted == -1)
options->forward_x11_trusted = 0;
if (options->forward_x11_timeout == -1)
options->forward_x11_timeout = 1200;
if (options->exit_on_forward_failure == -1)
options->exit_on_forward_failure = 0;
if (options->xauth_location == NULL)
options->xauth_location = _PATH_XAUTH;
if (options->gateway_ports == -1)
options->gateway_ports = 0;
if (options->use_privileged_port == -1)
options->use_privileged_port = 0;
if (options->rsa_authentication == -1)
options->rsa_authentication = 1;
if (options->pubkey_authentication == -1)
options->pubkey_authentication = 1;
if (options->challenge_response_authentication == -1)
options->challenge_response_authentication = 1;
if (options->gss_authentication == -1)
options->gss_authentication = 0;
if (options->gss_deleg_creds == -1)
options->gss_deleg_creds = 0;
if (options->password_authentication == -1)
options->password_authentication = 1;
if (options->kbd_interactive_authentication == -1)
options->kbd_interactive_authentication = 1;
if (options->rhosts_rsa_authentication == -1)
options->rhosts_rsa_authentication = 0;
if (options->hostbased_authentication == -1)
options->hostbased_authentication = 0;
if (options->batch_mode == -1)
options->batch_mode = 0;
if (options->check_host_ip == -1)
options->check_host_ip = 1;
if (options->strict_host_key_checking == -1)
options->strict_host_key_checking = 2; /* 2 is default */
if (options->compression == -1)
options->compression = 0;
if (options->tcp_keep_alive == -1)
options->tcp_keep_alive = 1;
if (options->compression_level == -1)
options->compression_level = 6;
if (options->port == -1)
options->port = 0; /* Filled in ssh_connect. */
if (options->address_family == -1)
options->address_family = AF_UNSPEC;
if (options->connection_attempts == -1)
options->connection_attempts = 1;
if (options->number_of_password_prompts == -1)
options->number_of_password_prompts = 3;
/* Selected in ssh_login(). */
if (options->cipher == -1)
options->cipher = SSH_CIPHER_NOT_SET;
/* options->ciphers, default set in myproposals.h */
/* options->macs, default set in myproposals.h */
/* options->kex_algorithms, default set in myproposals.h */
/* options->hostkeyalgorithms, default set in myproposals.h */
if (options->protocol == SSH_PROTO_UNKNOWN)
options->protocol = SSH_PROTO_2;
if (options->num_identity_files == 0) {
if (options->protocol & SSH_PROTO_1) {
add_identity_file(options, "~/",
_PATH_SSH_CLIENT_IDENTITY, 0);
}
if (options->protocol & SSH_PROTO_2) {
add_identity_file(options, "~/",
_PATH_SSH_CLIENT_ID_RSA, 0);
add_identity_file(options, "~/",
_PATH_SSH_CLIENT_ID_DSA, 0);
add_identity_file(options, "~/",
_PATH_SSH_CLIENT_ID_ECDSA, 0);
}
}
if (options->escape_char == -1)
options->escape_char = '~';
if (options->num_system_hostfiles == 0) {
options->system_hostfiles[options->num_system_hostfiles++] =
xstrdup(_PATH_SSH_SYSTEM_HOSTFILE);
options->system_hostfiles[options->num_system_hostfiles++] =
xstrdup(_PATH_SSH_SYSTEM_HOSTFILE2);
}
if (options->num_user_hostfiles == 0) {
options->user_hostfiles[options->num_user_hostfiles++] =
xstrdup(_PATH_SSH_USER_HOSTFILE);
options->user_hostfiles[options->num_user_hostfiles++] =
xstrdup(_PATH_SSH_USER_HOSTFILE2);
}
if (options->log_level == SYSLOG_LEVEL_NOT_SET)
options->log_level = SYSLOG_LEVEL_INFO;
if (options->clear_forwardings == 1)
clear_forwardings(options);
if (options->no_host_authentication_for_localhost == - 1)
options->no_host_authentication_for_localhost = 0;
if (options->identities_only == -1)
options->identities_only = 0;
if (options->enable_ssh_keysign == -1)
options->enable_ssh_keysign = 0;
if (options->rekey_limit == -1)
options->rekey_limit = 0;
if (options->rekey_interval == -1)
options->rekey_interval = 0;
if (options->verify_host_key_dns == -1)
options->verify_host_key_dns = 0;
if (options->server_alive_interval == -1)
options->server_alive_interval = 0;
if (options->server_alive_count_max == -1)
options->server_alive_count_max = 3;
if (options->control_master == -1)
options->control_master = 0;
if (options->control_persist == -1) {
options->control_persist = 0;
options->control_persist_timeout = 0;
}
if (options->hash_known_hosts == -1)
options->hash_known_hosts = 0;
if (options->tun_open == -1)
options->tun_open = SSH_TUNMODE_NO;
if (options->tun_local == -1)
options->tun_local = SSH_TUNID_ANY;
if (options->tun_remote == -1)
options->tun_remote = SSH_TUNID_ANY;
if (options->permit_local_command == -1)
options->permit_local_command = 0;
if (options->use_roaming == -1)
options->use_roaming = 1;
if (options->visual_host_key == -1)
options->visual_host_key = 0;
if (options->zero_knowledge_password_authentication == -1)
options->zero_knowledge_password_authentication = 0;
if (options->ip_qos_interactive == -1)
options->ip_qos_interactive = IPTOS_LOWDELAY;
if (options->ip_qos_bulk == -1)
options->ip_qos_bulk = IPTOS_THROUGHPUT;
if (options->request_tty == -1)
options->request_tty = REQUEST_TTY_AUTO;
/* options->local_command should not be set by default */
/* options->proxy_command should not be set by default */
/* options->user will be set in the main program if appropriate */
/* options->hostname will be set in the main program if appropriate */
/* options->host_key_alias should not be set by default */
/* options->preferred_authentications will be set in ssh */
}
