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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 14:40:04 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 14:40:04 +0000
commit25505898530a333011f4fd5cbc841ad6b26c089c (patch)
tree333a33fdd60930bcccc3f177ed9467d535e9bac6 /ssh.c
parentInitial commit. (diff)
downloadopenssh-25505898530a333011f4fd5cbc841ad6b26c089c.tar.xz
openssh-25505898530a333011f4fd5cbc841ad6b26c089c.zip
Adding upstream version 1:9.2p1.upstream/1%9.2p1upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'ssh.c')
-rw-r--r--ssh.c2388
1 files changed, 2388 insertions, 0 deletions
diff --git a/ssh.c b/ssh.c
new file mode 100644
index 0000000..87454b8
--- /dev/null
+++ b/ssh.c
@@ -0,0 +1,2388 @@
+/* $OpenBSD: ssh.c,v 1.584 2023/01/17 18:52:44 millert Exp $ */
+/*
+ * Author: Tatu Ylonen <ylo@cs.hut.fi>
+ * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
+ * All rights reserved
+ * Ssh client program. This program can be used to log into a remote machine.
+ * The software supports strong authentication, encryption, and forwarding
+ * of X11, TCP/IP, and authentication connections.
+ *
+ * As far as I am concerned, the code I have written for this software
+ * can be used freely for any purpose. Any derived versions of this
+ * software must be clearly marked as such, and if the derived work is
+ * incompatible with the protocol description in the RFC file, it must be
+ * called by a name other than "ssh" or "Secure Shell".
+ *
+ * Copyright (c) 1999 Niels Provos. All rights reserved.
+ * Copyright (c) 2000, 2001, 2002, 2003 Markus Friedl. All rights reserved.
+ *
+ * Modified to work with SSLeay by Niels Provos <provos@citi.umich.edu>
+ * in Canada (German citizen).
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "includes.h"
+
+#include <sys/types.h>
+#ifdef HAVE_SYS_STAT_H
+# include <sys/stat.h>
+#endif
+#include <sys/resource.h>
+#include <sys/ioctl.h>
+#include <sys/socket.h>
+#include <sys/wait.h>
+
+#include <ctype.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <netdb.h>
+#ifdef HAVE_PATHS_H
+#include <paths.h>
+#endif
+#include <pwd.h>
+#include <signal.h>
+#include <stdarg.h>
+#include <stddef.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <stdarg.h>
+#include <unistd.h>
+#include <limits.h>
+#include <locale.h>
+
+#include <netinet/in.h>
+#include <arpa/inet.h>
+
+#ifdef WITH_OPENSSL
+#include <openssl/evp.h>
+#include <openssl/err.h>
+#endif
+#include "openbsd-compat/openssl-compat.h"
+#include "openbsd-compat/sys-queue.h"
+
+#include "xmalloc.h"
+#include "ssh.h"
+#include "ssh2.h"
+#include "canohost.h"
+#include "compat.h"
+#include "cipher.h"
+#include "packet.h"
+#include "sshbuf.h"
+#include "channels.h"
+#include "sshkey.h"
+#include "authfd.h"
+#include "authfile.h"
+#include "pathnames.h"
+#include "dispatch.h"
+#include "clientloop.h"
+#include "log.h"
+#include "misc.h"
+#include "readconf.h"
+#include "sshconnect.h"
+#include "kex.h"
+#include "mac.h"
+#include "sshpty.h"
+#include "match.h"
+#include "msg.h"
+#include "version.h"
+#include "ssherr.h"
+#include "myproposal.h"
+#include "utf8.h"
+
+#ifdef ENABLE_PKCS11
+#include "ssh-pkcs11.h"
+#endif
+
+extern char *__progname;
+
+/* Saves a copy of argv for setproctitle emulation */
+#ifndef HAVE_SETPROCTITLE
+static char **saved_av;
+#endif
+
+/* Flag indicating whether debug mode is on. May be set on the command line. */
+int debug_flag = 0;
+
+/* Flag indicating whether a tty should be requested */
+int tty_flag = 0;
+
+/*
+ * Flag indicating that the current process should be backgrounded and
+ * a new mux-client launched in the foreground for ControlPersist.
+ */
+int need_controlpersist_detach = 0;
+
+/* Copies of flags for ControlPersist foreground mux-client */
+int ostdin_null_flag, osession_type, otty_flag, orequest_tty;
+
+/*
+ * General data structure for command line options and options configurable
+ * in configuration files. See readconf.h.
+ */
+Options options;
+
+/* optional user configfile */
+char *config = NULL;
+
+/*
+ * Name of the host we are connecting to. This is the name given on the
+ * command line, or the Hostname specified for the user-supplied name in a
+ * configuration file.
+ */
+char *host;
+
+/*
+ * A config can specify a path to forward, overriding SSH_AUTH_SOCK. If this is
+ * not NULL, forward the socket at this path instead.
+ */
+char *forward_agent_sock_path = NULL;
+
+/* socket address the host resolves to */
+struct sockaddr_storage hostaddr;
+
+/* Private host keys. */
+Sensitive sensitive_data;
+
+/* command to be executed */
+struct sshbuf *command;
+
+/* # of replies received for global requests */
+static int forward_confirms_pending = -1;
+
+/* mux.c */
+extern int muxserver_sock;
+extern u_int muxclient_command;
+
+/* Prints a help message to the user. This function never returns. */
+
+static void
+usage(void)
+{
+ fprintf(stderr,
+"usage: ssh [-46AaCfGgKkMNnqsTtVvXxYy] [-B bind_interface]\n"
+" [-b bind_address] [-c cipher_spec] [-D [bind_address:]port]\n"
+" [-E log_file] [-e escape_char] [-F configfile] [-I pkcs11]\n"
+" [-i identity_file] [-J [user@]host[:port]] [-L address]\n"
+" [-l login_name] [-m mac_spec] [-O ctl_cmd] [-o option] [-p port]\n"
+" [-Q query_option] [-R address] [-S ctl_path] [-W host:port]\n"
+" [-w local_tun[:remote_tun]] destination [command [argument ...]]\n"
+ );
+ exit(255);
+}
+
+static int ssh_session2(struct ssh *, const struct ssh_conn_info *);
+static void load_public_identity_files(const struct ssh_conn_info *);
+static void main_sigchld_handler(int);
+
+/* ~/ expand a list of paths. NB. assumes path[n] is heap-allocated. */
+static void
+tilde_expand_paths(char **paths, u_int num_paths)
+{
+ u_int i;
+ char *cp;
+
+ for (i = 0; i < num_paths; i++) {
+ cp = tilde_expand_filename(paths[i], getuid());
+ free(paths[i]);
+ paths[i] = cp;
+ }
+}
+
+/*
+ * Expands the set of percent_expand options used by the majority of keywords
+ * in the client that support percent expansion.
+ * Caller must free returned string.
+ */
+static char *
+default_client_percent_expand(const char *str,
+ const struct ssh_conn_info *cinfo)
+{
+ return percent_expand(str,
+ DEFAULT_CLIENT_PERCENT_EXPAND_ARGS(cinfo),
+ (char *)NULL);
+}
+
+/*
+ * Expands the set of percent_expand options used by the majority of keywords
+ * AND perform environment variable substitution.
+ * Caller must free returned string.
+ */
+static char *
+default_client_percent_dollar_expand(const char *str,
+ const struct ssh_conn_info *cinfo)
+{
+ char *ret;
+
+ ret = percent_dollar_expand(str,
+ DEFAULT_CLIENT_PERCENT_EXPAND_ARGS(cinfo),
+ (char *)NULL);
+ if (ret == NULL)
+ fatal("invalid environment variable expansion");
+ return ret;
+}
+
+/*
+ * Attempt to resolve a host name / port to a set of addresses and
+ * optionally return any CNAMEs encountered along the way.
+ * Returns NULL on failure.
+ * NB. this function must operate with a options having undefined members.
+ */
+static struct addrinfo *
+resolve_host(const char *name, int port, int logerr, char *cname, size_t clen)
+{
+ char strport[NI_MAXSERV];
+ const char *errstr = NULL;
+ struct addrinfo hints, *res;
+ int gaierr;
+ LogLevel loglevel = SYSLOG_LEVEL_DEBUG1;
+
+ if (port <= 0)
+ port = default_ssh_port();
+ if (cname != NULL)
+ *cname = '\0';
+ debug3_f("lookup %s:%d", name, port);
+
+ snprintf(strport, sizeof strport, "%d", port);
+ memset(&hints, 0, sizeof(hints));
+ hints.ai_family = options.address_family == -1 ?
+ AF_UNSPEC : options.address_family;
+ hints.ai_socktype = SOCK_STREAM;
+ if (cname != NULL)
+ hints.ai_flags = AI_CANONNAME;
+ if ((gaierr = getaddrinfo(name, strport, &hints, &res)) != 0) {
+ if (logerr || (gaierr != EAI_NONAME && gaierr != EAI_NODATA))
+ loglevel = SYSLOG_LEVEL_ERROR;
+ do_log2(loglevel, "%s: Could not resolve hostname %.100s: %s",
+ __progname, name, ssh_gai_strerror(gaierr));
+ return NULL;
+ }
+ if (cname != NULL && res->ai_canonname != NULL) {
+ if (!valid_domain(res->ai_canonname, 0, &errstr)) {
+ error("ignoring bad CNAME \"%s\" for host \"%s\": %s",
+ res->ai_canonname, name, errstr);
+ } else if (strlcpy(cname, res->ai_canonname, clen) >= clen) {
+ error_f("host \"%s\" cname \"%s\" too long (max %lu)",
+ name, res->ai_canonname, (u_long)clen);
+ if (clen > 0)
+ *cname = '\0';
+ }
+ }
+ return res;
+}
+
+/* Returns non-zero if name can only be an address and not a hostname */
+static int
+is_addr_fast(const char *name)
+{
+ return (strchr(name, '%') != NULL || strchr(name, ':') != NULL ||
+ strspn(name, "0123456789.") == strlen(name));
+}
+
+/* Returns non-zero if name represents a valid, single address */
+static int
+is_addr(const char *name)
+{
+ char strport[NI_MAXSERV];
+ struct addrinfo hints, *res;
+
+ if (is_addr_fast(name))
+ return 1;
+
+ snprintf(strport, sizeof strport, "%u", default_ssh_port());
+ memset(&hints, 0, sizeof(hints));
+ hints.ai_family = options.address_family == -1 ?
+ AF_UNSPEC : options.address_family;
+ hints.ai_socktype = SOCK_STREAM;
+ hints.ai_flags = AI_NUMERICHOST|AI_NUMERICSERV;
+ if (getaddrinfo(name, strport, &hints, &res) != 0)
+ return 0;
+ if (res == NULL || res->ai_next != NULL) {
+ freeaddrinfo(res);
+ return 0;
+ }
+ freeaddrinfo(res);
+ return 1;
+}
+
+/*
+ * Attempt to resolve a numeric host address / port to a single address.
+ * Returns a canonical address string.
+ * Returns NULL on failure.
+ * NB. this function must operate with a options having undefined members.
+ */
+static struct addrinfo *
+resolve_addr(const char *name, int port, char *caddr, size_t clen)
+{
+ char addr[NI_MAXHOST], strport[NI_MAXSERV];
+ struct addrinfo hints, *res;
+ int gaierr;
+
+ if (port <= 0)
+ port = default_ssh_port();
+ snprintf(strport, sizeof strport, "%u", port);
+ memset(&hints, 0, sizeof(hints));
+ hints.ai_family = options.address_family == -1 ?
+ AF_UNSPEC : options.address_family;
+ hints.ai_socktype = SOCK_STREAM;
+ hints.ai_flags = AI_NUMERICHOST|AI_NUMERICSERV;
+ if ((gaierr = getaddrinfo(name, strport, &hints, &res)) != 0) {
+ debug2_f("could not resolve name %.100s as address: %s",
+ name, ssh_gai_strerror(gaierr));
+ return NULL;
+ }
+ if (res == NULL) {
+ debug_f("getaddrinfo %.100s returned no addresses", name);
+ return NULL;
+ }
+ if (res->ai_next != NULL) {
+ debug_f("getaddrinfo %.100s returned multiple addresses", name);
+ goto fail;
+ }
+ if ((gaierr = getnameinfo(res->ai_addr, res->ai_addrlen,
+ addr, sizeof(addr), NULL, 0, NI_NUMERICHOST)) != 0) {
+ debug_f("Could not format address for name %.100s: %s",
+ name, ssh_gai_strerror(gaierr));
+ goto fail;
+ }
+ if (strlcpy(caddr, addr, clen) >= clen) {
+ error_f("host \"%s\" addr \"%s\" too long (max %lu)",
+ name, addr, (u_long)clen);
+ if (clen > 0)
+ *caddr = '\0';
+ fail:
+ freeaddrinfo(res);
+ return NULL;
+ }
+ return res;
+}
+
+/*
+ * Check whether the cname is a permitted replacement for the hostname
+ * and perform the replacement if it is.
+ * NB. this function must operate with a options having undefined members.
+ */
+static int
+check_follow_cname(int direct, char **namep, const char *cname)
+{
+ int i;
+ struct allowed_cname *rule;
+
+ if (*cname == '\0' || !config_has_permitted_cnames(&options) ||
+ strcmp(*namep, cname) == 0)
+ return 0;
+ if (options.canonicalize_hostname == SSH_CANONICALISE_NO)
+ return 0;
+ /*
+ * Don't attempt to canonicalize names that will be interpreted by
+ * a proxy or jump host unless the user specifically requests so.
+ */
+ if (!direct &&
+ options.canonicalize_hostname != SSH_CANONICALISE_ALWAYS)
+ return 0;
+ debug3_f("check \"%s\" CNAME \"%s\"", *namep, cname);
+ for (i = 0; i < options.num_permitted_cnames; i++) {
+ rule = options.permitted_cnames + i;
+ if (match_pattern_list(*namep, rule->source_list, 1) != 1 ||
+ match_pattern_list(cname, rule->target_list, 1) != 1)
+ continue;
+ verbose("Canonicalized DNS aliased hostname "
+ "\"%s\" => \"%s\"", *namep, cname);
+ free(*namep);
+ *namep = xstrdup(cname);
+ return 1;
+ }
+ return 0;
+}
+
+/*
+ * Attempt to resolve the supplied hostname after applying the user's
+ * canonicalization rules. Returns the address list for the host or NULL
+ * if no name was found after canonicalization.
+ * NB. this function must operate with a options having undefined members.
+ */
+static struct addrinfo *
+resolve_canonicalize(char **hostp, int port)
+{
+ int i, direct, ndots;
+ char *cp, *fullhost, newname[NI_MAXHOST];
+ struct addrinfo *addrs;
+
+ /*
+ * Attempt to canonicalise addresses, regardless of
+ * whether hostname canonicalisation was requested
+ */
+ if ((addrs = resolve_addr(*hostp, port,
+ newname, sizeof(newname))) != NULL) {
+ debug2_f("hostname %.100s is address", *hostp);
+ if (strcasecmp(*hostp, newname) != 0) {
+ debug2_f("canonicalised address \"%s\" => \"%s\"",
+ *hostp, newname);
+ free(*hostp);
+ *hostp = xstrdup(newname);
+ }
+ return addrs;
+ }
+
+ /*
+ * If this looks like an address but didn't parse as one, it might
+ * be an address with an invalid interface scope. Skip further
+ * attempts at canonicalisation.
+ */
+ if (is_addr_fast(*hostp)) {
+ debug_f("hostname %.100s is an unrecognised address", *hostp);
+ return NULL;
+ }
+
+ if (options.canonicalize_hostname == SSH_CANONICALISE_NO)
+ return NULL;
+
+ /*
+ * Don't attempt to canonicalize names that will be interpreted by
+ * a proxy unless the user specifically requests so.
+ */
+ direct = option_clear_or_none(options.proxy_command) &&
+ options.jump_host == NULL;
+ if (!direct &&
+ options.canonicalize_hostname != SSH_CANONICALISE_ALWAYS)
+ return NULL;
+
+ /* If domain name is anchored, then resolve it now */
+ if ((*hostp)[strlen(*hostp) - 1] == '.') {
+ debug3_f("name is fully qualified");
+ fullhost = xstrdup(*hostp);
+ if ((addrs = resolve_host(fullhost, port, 0,
+ newname, sizeof(newname))) != NULL)
+ goto found;
+ free(fullhost);
+ goto notfound;
+ }
+
+ /* Don't apply canonicalization to sufficiently-qualified hostnames */
+ ndots = 0;
+ for (cp = *hostp; *cp != '\0'; cp++) {
+ if (*cp == '.')
+ ndots++;
+ }
+ if (ndots > options.canonicalize_max_dots) {
+ debug3_f("not canonicalizing hostname \"%s\" (max dots %d)",
+ *hostp, options.canonicalize_max_dots);
+ return NULL;
+ }
+ /* Attempt each supplied suffix */
+ for (i = 0; i < options.num_canonical_domains; i++) {
+ if (strcasecmp(options.canonical_domains[i], "none") == 0)
+ break;
+ xasprintf(&fullhost, "%s.%s.", *hostp,
+ options.canonical_domains[i]);
+ debug3_f("attempting \"%s\" => \"%s\"", *hostp, fullhost);
+ if ((addrs = resolve_host(fullhost, port, 0,
+ newname, sizeof(newname))) == NULL) {
+ free(fullhost);
+ continue;
+ }
+ found:
+ /* Remove trailing '.' */
+ fullhost[strlen(fullhost) - 1] = '\0';
+ /* Follow CNAME if requested */
+ if (!check_follow_cname(direct, &fullhost, newname)) {
+ debug("Canonicalized hostname \"%s\" => \"%s\"",
+ *hostp, fullhost);
+ }
+ free(*hostp);
+ *hostp = fullhost;
+ return addrs;
+ }
+ notfound:
+ if (!options.canonicalize_fallback_local)
+ fatal("%s: Could not resolve host \"%s\"", __progname, *hostp);
+ debug2_f("host %s not found in any suffix", *hostp);
+ return NULL;
+}
+
+/*
+ * Check the result of hostkey loading, ignoring some errors and either
+ * discarding the key or fatal()ing for others.
+ */
+static void
+check_load(int r, struct sshkey **k, const char *path, const char *message)
+{
+ switch (r) {
+ case 0:
+ /* Check RSA keys size and discard if undersized */
+ if (k != NULL && *k != NULL &&
+ (r = sshkey_check_rsa_length(*k,
+ options.required_rsa_size)) != 0) {
+ error_r(r, "load %s \"%s\"", message, path);
+ free(*k);
+ *k = NULL;
+ }
+ break;
+ case SSH_ERR_INTERNAL_ERROR:
+ case SSH_ERR_ALLOC_FAIL:
+ fatal_r(r, "load %s \"%s\"", message, path);
+ case SSH_ERR_SYSTEM_ERROR:
+ /* Ignore missing files */
+ if (errno == ENOENT)
+ break;
+ /* FALLTHROUGH */
+ default:
+ error_r(r, "load %s \"%s\"", message, path);
+ break;
+ }
+}
+
+/*
+ * Read per-user configuration file. Ignore the system wide config
+ * file if the user specifies a config file on the command line.
+ */
+static void
+process_config_files(const char *host_name, struct passwd *pw, int final_pass,
+ int *want_final_pass)
+{
+ char buf[PATH_MAX];
+ int r;
+
+ if (config != NULL) {
+ if (strcasecmp(config, "none") != 0 &&
+ !read_config_file(config, pw, host, host_name, &options,
+ SSHCONF_USERCONF | (final_pass ? SSHCONF_FINAL : 0),
+ want_final_pass))
+ 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, pw, host, host_name,
+ &options, SSHCONF_CHECKPERM | SSHCONF_USERCONF |
+ (final_pass ? SSHCONF_FINAL : 0), want_final_pass);
+
+ /* Read systemwide configuration file after user config. */
+ (void)read_config_file(_PATH_HOST_CONFIG_FILE, pw,
+ host, host_name, &options,
+ final_pass ? SSHCONF_FINAL : 0, want_final_pass);
+ }
+}
+
+/* Rewrite the port number in an addrinfo list of addresses */
+static void
+set_addrinfo_port(struct addrinfo *addrs, int port)
+{
+ struct addrinfo *addr;
+
+ for (addr = addrs; addr != NULL; addr = addr->ai_next) {
+ switch (addr->ai_family) {
+ case AF_INET:
+ ((struct sockaddr_in *)addr->ai_addr)->
+ sin_port = htons(port);
+ break;
+ case AF_INET6:
+ ((struct sockaddr_in6 *)addr->ai_addr)->
+ sin6_port = htons(port);
+ break;
+ }
+ }
+}
+
+static void
+ssh_conn_info_free(struct ssh_conn_info *cinfo)
+{
+ if (cinfo == NULL)
+ return;
+ free(cinfo->conn_hash_hex);
+ free(cinfo->shorthost);
+ free(cinfo->uidstr);
+ free(cinfo->keyalias);
+ free(cinfo->thishost);
+ free(cinfo->host_arg);
+ free(cinfo->portstr);
+ free(cinfo->remhost);
+ free(cinfo->remuser);
+ free(cinfo->homedir);
+ free(cinfo->locuser);
+ free(cinfo);
+}
+
+/*
+ * Main program for the ssh client.
+ */
+int
+main(int ac, char **av)
+{
+ struct ssh *ssh = NULL;
+ int i, r, opt, exit_status, use_syslog, direct, timeout_ms;
+ int was_addr, config_test = 0, opt_terminated = 0, want_final_pass = 0;
+ char *p, *cp, *line, *argv0, *logfile;
+ char cname[NI_MAXHOST], thishost[NI_MAXHOST];
+ struct stat st;
+ struct passwd *pw;
+ extern int optind, optreset;
+ extern char *optarg;
+ struct Forward fwd;
+ struct addrinfo *addrs = NULL;
+ size_t n, len;
+ u_int j;
+ struct ssh_conn_info *cinfo = NULL;
+
+ /* Ensure that fds 0, 1 and 2 are open or directed to /dev/null */
+ sanitise_stdfd();
+
+ /*
+ * Discard other fds that are hanging around. These can cause problem
+ * with backgrounded ssh processes started by ControlPersist.
+ */
+ closefrom(STDERR_FILENO + 1);
+
+ __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
+
+ seed_rng();
+
+ /* Get user data. */
+ pw = getpwuid(getuid());
+ if (!pw) {
+ logit("No user exists for uid %lu", (u_long)getuid());
+ exit(255);
+ }
+ /* 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 | umask(077));
+
+ msetlocale();
+
+ /*
+ * Initialize option structure to indicate that no values have been
+ * set.
+ */
+ initialize_options(&options);
+
+ /*
+ * Prepare main ssh transport/connection structures
+ */
+ if ((ssh = ssh_alloc_session_state()) == NULL)
+ fatal("Couldn't allocate session state");
+ channel_init_channels(ssh);
+
+ /* 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"
+ "AB:CD:E:F:GI:J:KL:MNO:PQ:R:S:TVw:W:XYy")) != -1) { /* HUZdhjruz */
+ switch (opt) {
+ case '1':
+ fatal("SSH protocol v.1 is no longer supported");
+ break;
+ case '2':
+ /* Ignored */
+ break;
+ case '4':
+ options.address_family = AF_INET;
+ break;
+ case '6':
+ options.address_family = AF_INET6;
+ break;
+ case 'n':
+ options.stdin_null = 1;
+ break;
+ case 'f':
+ options.fork_after_authentication = 1;
+ options.stdin_null = 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 = optarg;
+ break;
+ case 'G':
+ config_test = 1;
+ break;
+ case 'Y':
+ options.forward_x11 = 1;
+ options.forward_x11_trusted = 1;
+ break;
+ case 'g':
+ options.fwd_opts.gateway_ports = 1;
+ break;
+ case 'O':
+ if (options.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 if (strcmp(optarg, "proxy") == 0)
+ muxclient_command = SSHMUX_COMMAND_PROXY;
+ else
+ fatal("Invalid multiplex command.");
+ break;
+ case 'P': /* deprecated */
+ break;
+ case 'Q':
+ cp = NULL;
+ if (strcmp(optarg, "cipher") == 0 ||
+ strcasecmp(optarg, "Ciphers") == 0)
+ cp = cipher_alg_list('\n', 0);
+ else if (strcmp(optarg, "cipher-auth") == 0)
+ cp = cipher_alg_list('\n', 1);
+ else if (strcmp(optarg, "mac") == 0 ||
+ strcasecmp(optarg, "MACs") == 0)
+ cp = mac_alg_list('\n');
+ else if (strcmp(optarg, "kex") == 0 ||
+ strcasecmp(optarg, "KexAlgorithms") == 0)
+ cp = kex_alg_list('\n');
+ else if (strcmp(optarg, "key") == 0)
+ cp = sshkey_alg_list(0, 0, 0, '\n');
+ else if (strcmp(optarg, "key-cert") == 0)
+ cp = sshkey_alg_list(1, 0, 0, '\n');
+ else if (strcmp(optarg, "key-plain") == 0)
+ cp = sshkey_alg_list(0, 1, 0, '\n');
+ else if (strcmp(optarg, "key-sig") == 0 ||
+ strcasecmp(optarg, "PubkeyAcceptedKeyTypes") == 0 || /* deprecated name */
+ strcasecmp(optarg, "PubkeyAcceptedAlgorithms") == 0 ||
+ strcasecmp(optarg, "HostKeyAlgorithms") == 0 ||
+ strcasecmp(optarg, "HostbasedKeyTypes") == 0 || /* deprecated name */
+ strcasecmp(optarg, "HostbasedAcceptedKeyTypes") == 0 || /* deprecated name */
+ strcasecmp(optarg, "HostbasedAcceptedAlgorithms") == 0)
+ cp = sshkey_alg_list(0, 0, 1, '\n');
+ else if (strcmp(optarg, "sig") == 0)
+ cp = sshkey_alg_list(0, 1, 1, '\n');
+ else if (strcmp(optarg, "protocol-version") == 0)
+ cp = xstrdup("2");
+ else if (strcmp(optarg, "compression") == 0) {
+ cp = xstrdup(compression_alg_list(0));
+ len = strlen(cp);
+ for (n = 0; n < len; n++)
+ if (cp[n] == ',')
+ cp[n] = '\n';
+ } else if (strcmp(optarg, "help") == 0) {
+ cp = xstrdup(
+ "cipher\ncipher-auth\ncompression\nkex\n"
+ "key\nkey-cert\nkey-plain\nkey-sig\nmac\n"
+ "protocol-version\nsig");
+ }
+ 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':
+ p = tilde_expand_filename(optarg, getuid());
+ if (stat(p, &st) == -1)
+ fprintf(stderr, "Warning: Identity file %s "
+ "not accessible: %s.\n", p,
+ strerror(errno));
+ else
+ add_identity_file(&options, NULL, p, 1);
+ free(p);
+ break;
+ case 'I':
+#ifdef ENABLE_PKCS11
+ free(options.pkcs11_provider);
+ options.pkcs11_provider = xstrdup(optarg);
+#else
+ fprintf(stderr, "no support for PKCS#11.\n");
+#endif
+ break;
+ case 'J':
+ if (options.jump_host != NULL) {
+ fatal("Only a single -J option is permitted "
+ "(use commas to separate multiple "
+ "jump hops)");
+ }
+ if (options.proxy_command != NULL)
+ fatal("Cannot specify -J with ProxyCommand");
+ if (parse_jump(optarg, &options, 1) == -1)
+ fatal("Invalid -J argument");
+ options.proxy_command = xstrdup("none");
+ 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) {
+ debug_flag++;
+ options.log_level++;
+ }
+ }
+ break;
+ case 'V':
+ fprintf(stderr, "%s, %s\n",
+ SSH_RELEASE, SSH_OPENSSL_VERSION);
+ 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 (options.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)) {
+ options.stdio_forward_host = fwd.listen_host;
+ options.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;
+ options.session_type = SESSION_TYPE_NONE;
+ 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 == '+' || *optarg == '^' ?
+ optarg + 1 : optarg)) {
+ fprintf(stderr, "Unknown cipher type '%s'\n",
+ optarg);
+ exit(255);
+ }
+ free(options.ciphers);
+ options.ciphers = xstrdup(optarg);
+ break;
+ case 'm':
+ if (mac_valid(optarg)) {
+ free(options.macs);
+ 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':
+ if (options.port == -1) {
+ options.port = a2port(optarg);
+ if (options.port <= 0) {
+ fprintf(stderr, "Bad port '%s'\n",
+ optarg);
+ exit(255);
+ }
+ }
+ break;
+ case 'l':
+ if (options.user == NULL)
+ 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) ||
+ parse_forward(&fwd, optarg, 1, 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':
+#ifdef WITH_ZLIB
+ options.compression = 1;
+#else
+ error("Compression not supported, disabling.");
+#endif
+ break;
+ case 'N':
+ if (options.session_type != -1 &&
+ options.session_type != SESSION_TYPE_NONE)
+ fatal("Cannot specify -N with -s/SessionType");
+ options.session_type = SESSION_TYPE_NONE;
+ options.request_tty = REQUEST_TTY_NO;
+ break;
+ case 'T':
+ options.request_tty = REQUEST_TTY_NO;
+ break;
+ case 'o':
+ line = xstrdup(optarg);
+ if (process_config_line(&options, pw,
+ host ? host : "", host ? host : "", line,
+ "command-line", 0, NULL, SSHCONF_USERCONF) != 0)
+ exit(255);
+ free(line);
+ break;
+ case 's':
+ if (options.session_type != -1 &&
+ options.session_type != SESSION_TYPE_SUBSYSTEM)
+ fatal("Cannot specify -s with -N/SessionType");
+ options.session_type = SESSION_TYPE_SUBSYSTEM;
+ break;
+ case 'S':
+ free(options.control_path);
+ options.control_path = xstrdup(optarg);
+ break;
+ case 'b':
+ options.bind_address = optarg;
+ break;
+ case 'B':
+ options.bind_interface = optarg;
+ break;
+ case 'F':
+ config = optarg;
+ break;
+ default:
+ usage();
+ }
+ }
+
+ if (optind > 1 && strcmp(av[optind - 1], "--") == 0)
+ opt_terminated = 1;
+
+ ac -= optind;
+ av += optind;
+
+ if (ac > 0 && !host) {
+ int tport;
+ char *tuser;
+ switch (parse_ssh_uri(*av, &tuser, &host, &tport)) {
+ case -1:
+ usage();
+ break;
+ case 0:
+ if (options.user == NULL) {
+ options.user = tuser;
+ tuser = NULL;
+ }
+ free(tuser);
+ if (options.port == -1 && tport != -1)
+ options.port = tport;
+ break;
+ default:
+ p = xstrdup(*av);
+ cp = strrchr(p, '@');
+ if (cp != NULL) {
+ if (cp == p)
+ usage();
+ if (options.user == NULL) {
+ options.user = p;
+ p = NULL;
+ }
+ *cp++ = '\0';
+ host = xstrdup(cp);
+ free(p);
+ } else
+ host = p;
+ break;
+ }
+ if (ac > 1 && !opt_terminated) {
+ optind = optreset = 1;
+ goto again;
+ }
+ ac--, av++;
+ }
+
+ /* Check that we got a host name. */
+ if (!host)
+ usage();
+
+ options.host_arg = xstrdup(host);
+
+ /* Initialize the command to execute on remote host. */
+ if ((command = sshbuf_new()) == NULL)
+ fatal("sshbuf_new failed");
+
+ /*
+ * 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 (options.session_type == SESSION_TYPE_SUBSYSTEM) {
+ 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 ((r = sshbuf_putf(command, "%s%s",
+ i ? " " : "", av[i])) != 0)
+ fatal_fr(r, "buffer error");
+ }
+ }
+
+ ssh_signal(SIGPIPE, SIG_IGN); /* ignore SIGPIPE early */
+
+ /*
+ * 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);
+ log_init(argv0,
+ options.log_level == SYSLOG_LEVEL_NOT_SET ?
+ SYSLOG_LEVEL_INFO : options.log_level,
+ options.log_facility == SYSLOG_FACILITY_NOT_SET ?
+ SYSLOG_FACILITY_USER : options.log_facility,
+ !use_syslog);
+
+ if (debug_flag)
+ logit("%s, %s", SSH_RELEASE, SSH_OPENSSL_VERSION);
+
+ /* Parse the configuration files */
+ process_config_files(options.host_arg, pw, 0, &want_final_pass);
+ if (want_final_pass)
+ debug("configuration requests final Match pass");
+
+ /* Hostname canonicalisation needs a few options filled. */
+ fill_default_options_for_canonicalization(&options);
+
+ /* If the user has replaced the hostname then take it into use now */
+ if (options.hostname != NULL) {
+ /* NB. Please keep in sync with readconf.c:match_cfg_line() */
+ cp = percent_expand(options.hostname,
+ "h", host, (char *)NULL);
+ free(host);
+ host = cp;
+ free(options.hostname);
+ options.hostname = xstrdup(host);
+ }
+
+ /* Don't lowercase addresses, they will be explicitly canonicalised */
+ if ((was_addr = is_addr(host)) == 0)
+ lowercase(host);
+
+ /*
+ * Try to canonicalize if requested by configuration or the
+ * hostname is an address.
+ */
+ if (options.canonicalize_hostname != SSH_CANONICALISE_NO || was_addr)
+ addrs = resolve_canonicalize(&host, options.port);
+
+ /*
+ * If CanonicalizePermittedCNAMEs have been specified but
+ * other canonicalization did not happen (by not being requested
+ * or by failing with fallback) then the hostname may still be changed
+ * as a result of CNAME following.
+ *
+ * Try to resolve the bare hostname name using the system resolver's
+ * usual search rules and then apply the CNAME follow rules.
+ *
+ * Skip the lookup if a ProxyCommand is being used unless the user
+ * has specifically requested canonicalisation for this case via
+ * CanonicalizeHostname=always
+ */
+ direct = option_clear_or_none(options.proxy_command) &&
+ options.jump_host == NULL;
+ if (addrs == NULL && config_has_permitted_cnames(&options) && (direct ||
+ options.canonicalize_hostname == SSH_CANONICALISE_ALWAYS)) {
+ if ((addrs = resolve_host(host, options.port,
+ direct, cname, sizeof(cname))) == NULL) {
+ /* Don't fatal proxied host names not in the DNS */
+ if (direct)
+ cleanup_exit(255); /* logged in resolve_host */
+ } else
+ check_follow_cname(direct, &host, cname);
+ }
+
+ /*
+ * If canonicalisation is enabled then re-parse the configuration
+ * files as new stanzas may match.
+ */
+ if (options.canonicalize_hostname != 0 && !want_final_pass) {
+ debug("hostname canonicalisation enabled, "
+ "will re-parse configuration");
+ want_final_pass = 1;
+ }
+
+ if (want_final_pass) {
+ debug("re-parsing configuration");
+ free(options.hostname);
+ options.hostname = xstrdup(host);
+ process_config_files(options.host_arg, pw, 1, NULL);
+ /*
+ * Address resolution happens early with canonicalisation
+ * enabled and the port number may have changed since, so
+ * reset it in address list
+ */
+ if (addrs != NULL && options.port > 0)
+ set_addrinfo_port(addrs, options.port);
+ }
+
+ /* Fill configuration defaults. */
+ if (fill_default_options(&options) != 0)
+ cleanup_exit(255);
+
+ if (options.user == NULL)
+ options.user = xstrdup(pw->pw_name);
+
+ /*
+ * If ProxyJump option specified, then construct a ProxyCommand now.
+ */
+ if (options.jump_host != NULL) {
+ char port_s[8];
+ const char *jumpuser = options.jump_user, *sshbin = argv0;
+ int port = options.port, jumpport = options.jump_port;
+
+ if (port <= 0)
+ port = default_ssh_port();
+ if (jumpport <= 0)
+ jumpport = default_ssh_port();
+ if (jumpuser == NULL)
+ jumpuser = options.user;
+ if (strcmp(options.jump_host, host) == 0 && port == jumpport &&
+ strcmp(options.user, jumpuser) == 0)
+ fatal("jumphost loop via %s", options.jump_host);
+
+ /*
+ * Try to use SSH indicated by argv[0], but fall back to
+ * "ssh" if it appears unavailable.
+ */
+ if (strchr(argv0, '/') != NULL && access(argv0, X_OK) != 0)
+ sshbin = "ssh";
+
+ /* Consistency check */
+ if (options.proxy_command != NULL)
+ fatal("inconsistent options: ProxyCommand+ProxyJump");
+ /* Never use FD passing for ProxyJump */
+ options.proxy_use_fdpass = 0;
+ snprintf(port_s, sizeof(port_s), "%d", options.jump_port);
+ xasprintf(&options.proxy_command,
+ "%s%s%s%s%s%s%s%s%s%s%.*s -W '[%%h]:%%p' %s",
+ sshbin,
+ /* Optional "-l user" argument if jump_user set */
+ options.jump_user == NULL ? "" : " -l ",
+ options.jump_user == NULL ? "" : options.jump_user,
+ /* Optional "-p port" argument if jump_port set */
+ options.jump_port <= 0 ? "" : " -p ",
+ options.jump_port <= 0 ? "" : port_s,
+ /* Optional additional jump hosts ",..." */
+ options.jump_extra == NULL ? "" : " -J ",
+ options.jump_extra == NULL ? "" : options.jump_extra,
+ /* Optional "-F" argument if -F specified */
+ config == NULL ? "" : " -F ",
+ config == NULL ? "" : config,
+ /* Optional "-v" arguments if -v set */
+ debug_flag ? " -" : "",
+ debug_flag, "vvv",
+ /* Mandatory hostname */
+ options.jump_host);
+ debug("Setting implicit ProxyCommand from ProxyJump: %s",
+ options.proxy_command);
+ }
+
+ if (options.port == 0)
+ options.port = default_ssh_port();
+ channel_set_af(ssh, options.address_family);
+
+ /* Tidy and check options */
+ if (options.host_key_alias != NULL)
+ lowercase(options.host_key_alias);
+ if (options.proxy_command != NULL &&
+ strcmp(options.proxy_command, "-") == 0 &&
+ options.proxy_use_fdpass)
+ fatal("ProxyCommand=- and ProxyUseFDPass are incompatible");
+ if (options.update_hostkeys == SSH_UPDATE_HOSTKEYS_ASK) {
+ if (options.control_persist && options.control_path != NULL) {
+ debug("UpdateHostKeys=ask is incompatible with "
+ "ControlPersist; disabling");
+ options.update_hostkeys = 0;
+ } else if (sshbuf_len(command) != 0 ||
+ options.remote_command != NULL ||
+ options.request_tty == REQUEST_TTY_NO) {
+ debug("UpdateHostKeys=ask is incompatible with "
+ "remote command execution; disabling");
+ options.update_hostkeys = 0;
+ } else if (options.log_level < SYSLOG_LEVEL_INFO) {
+ /* no point logging anything; user won't see it */
+ options.update_hostkeys = 0;
+ }
+ }
+ if (options.connection_attempts <= 0)
+ fatal("Invalid number of ConnectionAttempts");
+
+ if (sshbuf_len(command) != 0 && options.remote_command != NULL)
+ fatal("Cannot execute command-line and remote command.");
+
+ /* Cannot fork to background if no command. */
+ if (options.fork_after_authentication && sshbuf_len(command) == 0 &&
+ options.remote_command == NULL &&
+ options.session_type != SESSION_TYPE_NONE)
+ fatal("Cannot fork into background without a command "
+ "to execute.");
+
+ /* reinit */
+ log_init(argv0, options.log_level, options.log_facility, !use_syslog);
+ for (j = 0; j < options.num_log_verbose; j++) {
+ if (strcasecmp(options.log_verbose[j], "none") == 0)
+ break;
+ log_verbose_add(options.log_verbose[j]);
+ }
+
+ 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 (sshbuf_len(command) == 0 && options.remote_command == NULL)
+ tty_flag = options.request_tty != REQUEST_TTY_NO;
+
+ /* Force no tty */
+ if (options.request_tty == REQUEST_TTY_NO ||
+ (muxclient_command && muxclient_command != SSHMUX_COMMAND_PROXY) ||
+ options.session_type == SESSION_TYPE_NONE)
+ tty_flag = 0;
+ /* Do not allocate a tty if stdin is not a tty. */
+ if ((!isatty(fileno(stdin)) || options.stdin_null) &&
+ 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;
+ }
+
+ /* Set up strings used to percent_expand() arguments */
+ cinfo = xcalloc(1, sizeof(*cinfo));
+ if (gethostname(thishost, sizeof(thishost)) == -1)
+ fatal("gethostname: %s", strerror(errno));
+ cinfo->thishost = xstrdup(thishost);
+ thishost[strcspn(thishost, ".")] = '\0';
+ cinfo->shorthost = xstrdup(thishost);
+ xasprintf(&cinfo->portstr, "%d", options.port);
+ xasprintf(&cinfo->uidstr, "%llu",
+ (unsigned long long)pw->pw_uid);
+ cinfo->keyalias = xstrdup(options.host_key_alias ?
+ options.host_key_alias : options.host_arg);
+ cinfo->conn_hash_hex = ssh_connection_hash(cinfo->thishost, host,
+ cinfo->portstr, options.user);
+ cinfo->host_arg = xstrdup(options.host_arg);
+ cinfo->remhost = xstrdup(host);
+ cinfo->remuser = xstrdup(options.user);
+ cinfo->homedir = xstrdup(pw->pw_dir);
+ cinfo->locuser = xstrdup(pw->pw_name);
+
+ /*
+ * Expand tokens in arguments. NB. LocalCommand is expanded later,
+ * after port-forwarding is set up, so it may pick up any local
+ * tunnel interface name allocated.
+ */
+ if (options.remote_command != NULL) {
+ debug3("expanding RemoteCommand: %s", options.remote_command);
+ cp = options.remote_command;
+ options.remote_command = default_client_percent_expand(cp,
+ cinfo);
+ debug3("expanded RemoteCommand: %s", options.remote_command);
+ free(cp);
+ if ((r = sshbuf_put(command, options.remote_command,
+ strlen(options.remote_command))) != 0)
+ fatal_fr(r, "buffer error");
+ }
+
+ if (options.control_path != NULL) {
+ cp = tilde_expand_filename(options.control_path, getuid());
+ free(options.control_path);
+ options.control_path = default_client_percent_dollar_expand(cp,
+ cinfo);
+ free(cp);
+ }
+
+ if (options.identity_agent != NULL) {
+ p = tilde_expand_filename(options.identity_agent, getuid());
+ cp = default_client_percent_dollar_expand(p, cinfo);
+ free(p);
+ free(options.identity_agent);
+ options.identity_agent = cp;
+ }
+
+ if (options.forward_agent_sock_path != NULL) {
+ p = tilde_expand_filename(options.forward_agent_sock_path,
+ getuid());
+ cp = default_client_percent_dollar_expand(p, cinfo);
+ free(p);
+ free(options.forward_agent_sock_path);
+ options.forward_agent_sock_path = cp;
+ if (stat(options.forward_agent_sock_path, &st) != 0) {
+ error("Cannot forward agent socket path \"%s\": %s",
+ options.forward_agent_sock_path, strerror(errno));
+ if (options.exit_on_forward_failure)
+ cleanup_exit(255);
+ }
+ }
+
+ if (options.num_system_hostfiles > 0 &&
+ strcasecmp(options.system_hostfiles[0], "none") == 0) {
+ if (options.num_system_hostfiles > 1)
+ fatal("Invalid GlobalKnownHostsFiles: \"none\" "
+ "appears with other entries");
+ free(options.system_hostfiles[0]);
+ options.system_hostfiles[0] = NULL;
+ options.num_system_hostfiles = 0;
+ }
+
+ if (options.num_user_hostfiles > 0 &&
+ strcasecmp(options.user_hostfiles[0], "none") == 0) {
+ if (options.num_user_hostfiles > 1)
+ fatal("Invalid UserKnownHostsFiles: \"none\" "
+ "appears with other entries");
+ free(options.user_hostfiles[0]);
+ options.user_hostfiles[0] = NULL;
+ options.num_user_hostfiles = 0;
+ }
+ for (j = 0; j < options.num_user_hostfiles; j++) {
+ if (options.user_hostfiles[j] == NULL)
+ continue;
+ cp = tilde_expand_filename(options.user_hostfiles[j], getuid());
+ p = default_client_percent_dollar_expand(cp, cinfo);
+ if (strcmp(options.user_hostfiles[j], p) != 0)
+ debug3("expanded UserKnownHostsFile '%s' -> "
+ "'%s'", options.user_hostfiles[j], p);
+ free(options.user_hostfiles[j]);
+ free(cp);
+ options.user_hostfiles[j] = p;
+ }
+
+ for (i = 0; i < options.num_local_forwards; i++) {
+ if (options.local_forwards[i].listen_path != NULL) {
+ cp = options.local_forwards[i].listen_path;
+ p = options.local_forwards[i].listen_path =
+ default_client_percent_expand(cp, cinfo);
+ if (strcmp(cp, p) != 0)
+ debug3("expanded LocalForward listen path "
+ "'%s' -> '%s'", cp, p);
+ free(cp);
+ }
+ if (options.local_forwards[i].connect_path != NULL) {
+ cp = options.local_forwards[i].connect_path;
+ p = options.local_forwards[i].connect_path =
+ default_client_percent_expand(cp, cinfo);
+ if (strcmp(cp, p) != 0)
+ debug3("expanded LocalForward connect path "
+ "'%s' -> '%s'", cp, p);
+ free(cp);
+ }
+ }
+
+ for (i = 0; i < options.num_remote_forwards; i++) {
+ if (options.remote_forwards[i].listen_path != NULL) {
+ cp = options.remote_forwards[i].listen_path;
+ p = options.remote_forwards[i].listen_path =
+ default_client_percent_expand(cp, cinfo);
+ if (strcmp(cp, p) != 0)
+ debug3("expanded RemoteForward listen path "
+ "'%s' -> '%s'", cp, p);
+ free(cp);
+ }
+ if (options.remote_forwards[i].connect_path != NULL) {
+ cp = options.remote_forwards[i].connect_path;
+ p = options.remote_forwards[i].connect_path =
+ default_client_percent_expand(cp, cinfo);
+ if (strcmp(cp, p) != 0)
+ debug3("expanded RemoteForward connect path "
+ "'%s' -> '%s'", cp, p);
+ free(cp);
+ }
+ }
+
+ if (config_test) {
+ dump_client_config(&options, host);
+ exit(0);
+ }
+
+ /* Expand SecurityKeyProvider if it refers to an environment variable */
+ if (options.sk_provider != NULL && *options.sk_provider == '$' &&
+ strlen(options.sk_provider) > 1) {
+ if ((cp = getenv(options.sk_provider + 1)) == NULL) {
+ debug("Authenticator provider %s did not resolve; "
+ "disabling", options.sk_provider);
+ free(options.sk_provider);
+ options.sk_provider = NULL;
+ } else {
+ debug2("resolved SecurityKeyProvider %s => %s",
+ options.sk_provider, cp);
+ free(options.sk_provider);
+ options.sk_provider = xstrdup(cp);
+ }
+ }
+
+ if (muxclient_command != 0 && options.control_path == NULL)
+ fatal("No ControlPath specified for \"-O\" command");
+ if (options.control_path != NULL) {
+ int sock;
+ if ((sock = muxclient(options.control_path)) >= 0) {
+ ssh_packet_set_connection(ssh, sock, sock);
+ ssh_packet_set_mux(ssh);
+ goto skip_connect;
+ }
+ }
+
+ /*
+ * If hostname canonicalisation was not enabled, then we may not
+ * have yet resolved the hostname. Do so now.
+ */
+ if (addrs == NULL && options.proxy_command == NULL) {
+ debug2("resolving \"%s\" port %d", host, options.port);
+ if ((addrs = resolve_host(host, options.port, 1,
+ cname, sizeof(cname))) == NULL)
+ cleanup_exit(255); /* resolve_host logs the error */
+ }
+
+ if (options.connection_timeout >= INT_MAX/1000)
+ timeout_ms = INT_MAX;
+ else
+ timeout_ms = options.connection_timeout * 1000;
+
+ /* Open a connection to the remote host. */
+ if (ssh_connect(ssh, host, options.host_arg, addrs, &hostaddr,
+ options.port, options.connection_attempts,
+ &timeout_ms, options.tcp_keep_alive) != 0)
+ exit(255);
+
+ if (addrs != NULL)
+ freeaddrinfo(addrs);
+
+ ssh_packet_set_timeout(ssh, options.server_alive_interval,
+ options.server_alive_count_max);
+
+ if (timeout_ms > 0)
+ debug3("timeout: %d ms remain after connect", timeout_ms);
+
+ /*
+ * If we successfully made the connection and we have hostbased auth
+ * enabled, load the public keys so we can later use the ssh-keysign
+ * helper to sign challenges.
+ */
+ sensitive_data.nkeys = 0;
+ sensitive_data.keys = NULL;
+ if (options.hostbased_authentication) {
+ int loaded = 0;
+
+ sensitive_data.nkeys = 10;
+ sensitive_data.keys = xcalloc(sensitive_data.nkeys,
+ sizeof(*sensitive_data.keys));
+
+ /* XXX check errors? */
+#define L_PUBKEY(p,o) do { \
+ if ((o) >= sensitive_data.nkeys) \
+ fatal_f("pubkey out of array bounds"); \
+ check_load(sshkey_load_public(p, &(sensitive_data.keys[o]), NULL), \
+ &(sensitive_data.keys[o]), p, "pubkey"); \
+ if (sensitive_data.keys[o] != NULL) { \
+ debug2("hostbased key %d: %s key from \"%s\"", o, \
+ sshkey_ssh_name(sensitive_data.keys[o]), p); \
+ loaded++; \
+ } \
+} while (0)
+#define L_CERT(p,o) do { \
+ if ((o) >= sensitive_data.nkeys) \
+ fatal_f("cert out of array bounds"); \
+ check_load(sshkey_load_cert(p, &(sensitive_data.keys[o])), \
+ &(sensitive_data.keys[o]), p, "cert"); \
+ if (sensitive_data.keys[o] != NULL) { \
+ debug2("hostbased key %d: %s cert from \"%s\"", o, \
+ sshkey_ssh_name(sensitive_data.keys[o]), p); \
+ loaded++; \
+ } \
+} while (0)
+
+ if (options.hostbased_authentication == 1) {
+ L_CERT(_PATH_HOST_ECDSA_KEY_FILE, 0);
+ L_CERT(_PATH_HOST_ED25519_KEY_FILE, 1);
+ L_CERT(_PATH_HOST_RSA_KEY_FILE, 2);
+ L_CERT(_PATH_HOST_DSA_KEY_FILE, 3);
+ L_PUBKEY(_PATH_HOST_ECDSA_KEY_FILE, 4);
+ L_PUBKEY(_PATH_HOST_ED25519_KEY_FILE, 5);
+ L_PUBKEY(_PATH_HOST_RSA_KEY_FILE, 6);
+ L_PUBKEY(_PATH_HOST_DSA_KEY_FILE, 7);
+ L_CERT(_PATH_HOST_XMSS_KEY_FILE, 8);
+ L_PUBKEY(_PATH_HOST_XMSS_KEY_FILE, 9);
+ if (loaded == 0)
+ debug("HostbasedAuthentication enabled but no "
+ "local public host keys could be loaded.");
+ }
+ }
+
+ /* load options.identity_files */
+ load_public_identity_files(cinfo);
+
+ /* optionally set the SSH_AUTHSOCKET_ENV_NAME variable */
+ if (options.identity_agent &&
+ strcmp(options.identity_agent, SSH_AUTHSOCKET_ENV_NAME) != 0) {
+ if (strcmp(options.identity_agent, "none") == 0) {
+ unsetenv(SSH_AUTHSOCKET_ENV_NAME);
+ } else {
+ cp = options.identity_agent;
+ /* legacy (limited) format */
+ if (cp[0] == '$' && cp[1] != '{') {
+ if (!valid_env_name(cp + 1)) {
+ fatal("Invalid IdentityAgent "
+ "environment variable name %s", cp);
+ }
+ if ((p = getenv(cp + 1)) == NULL)
+ unsetenv(SSH_AUTHSOCKET_ENV_NAME);
+ else
+ setenv(SSH_AUTHSOCKET_ENV_NAME, p, 1);
+ } else {
+ /* identity_agent specifies a path directly */
+ setenv(SSH_AUTHSOCKET_ENV_NAME, cp, 1);
+ }
+ }
+ }
+
+ if (options.forward_agent && options.forward_agent_sock_path != NULL) {
+ cp = options.forward_agent_sock_path;
+ if (cp[0] == '$') {
+ if (!valid_env_name(cp + 1)) {
+ fatal("Invalid ForwardAgent environment variable name %s", cp);
+ }
+ if ((p = getenv(cp + 1)) != NULL)
+ forward_agent_sock_path = xstrdup(p);
+ else
+ options.forward_agent = 0;
+ free(cp);
+ } else {
+ forward_agent_sock_path = cp;
+ }
+ }
+
+ /* 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);
+
+ ssh_signal(SIGCHLD, main_sigchld_handler);
+
+ /* Log into the remote system. Never returns if the login fails. */
+ ssh_login(ssh, &sensitive_data, host, (struct sockaddr *)&hostaddr,
+ options.port, pw, timeout_ms, cinfo);
+
+ /* 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);
+ sshkey_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]) {
+ sshkey_free(options.identity_keys[i]);
+ options.identity_keys[i] = NULL;
+ }
+ }
+ for (i = 0; i < options.num_certificate_files; i++) {
+ free(options.certificate_files[i]);
+ options.certificate_files[i] = NULL;
+ }
+
+#ifdef ENABLE_PKCS11
+ (void)pkcs11_del_provider(options.pkcs11_provider);
+#endif
+
+ skip_connect:
+ exit_status = ssh_session2(ssh, cinfo);
+ ssh_conn_info_free(cinfo);
+ ssh_packet_close(ssh);
+
+ 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;
+}
+
+static void
+control_persist_detach(void)
+{
+ pid_t pid;
+
+ debug_f("backgrounding master process");
+
+ /*
+ * master (current process) into the background, and make the
+ * foreground process a client of the backgrounded master.
+ */
+ switch ((pid = fork())) {
+ case -1:
+ fatal_f("fork: %s", strerror(errno));
+ case 0:
+ /* Child: master process continues mainloop */
+ break;
+ default:
+ /* Parent: set up mux client to connect to backgrounded master */
+ debug2_f("background process is %ld", (long)pid);
+ options.stdin_null = ostdin_null_flag;
+ options.request_tty = orequest_tty;
+ tty_flag = otty_flag;
+ options.session_type = osession_type;
+ close(muxserver_sock);
+ muxserver_sock = -1;
+ options.control_master = SSHCTL_MASTER_NO;
+ muxclient(options.control_path);
+ /* muxclient() doesn't return on success. */
+ fatal("Failed to connect to new control master");
+ }
+ if (stdfd_devnull(1, 1, !(log_is_on_stderr() && debug_flag)) == -1)
+ error_f("stdfd_devnull failed");
+ daemon(1, 1);
+ setproctitle("%s [mux]", options.control_path);
+}
+
+/* Do fork() after authentication. Used by "ssh -f" */
+static void
+fork_postauth(void)
+{
+ if (need_controlpersist_detach)
+ control_persist_detach();
+ debug("forking to background");
+ options.fork_after_authentication = 0;
+ if (daemon(1, 1) == -1)
+ fatal("daemon() failed: %.200s", strerror(errno));
+ if (stdfd_devnull(1, 1, !(log_is_on_stderr() && debug_flag)) == -1)
+ error_f("stdfd_devnull failed");
+}
+
+static void
+forwarding_success(void)
+{
+ if (forward_confirms_pending == -1)
+ return;
+ if (--forward_confirms_pending == 0) {
+ debug_f("all expected forwarding replies received");
+ if (options.fork_after_authentication)
+ fork_postauth();
+ } else {
+ debug2_f("%d expected forwarding replies remaining",
+ forward_confirms_pending);
+ }
+}
+
+/* Callback for remote forward global requests */
+static void
+ssh_confirm_remote_forward(struct ssh *ssh, int type, u_int32_t seq, void *ctxt)
+{
+ struct Forward *rfwd = (struct Forward *)ctxt;
+ u_int port;
+ int r;
+
+ /* XXX verbose() on failure? */
+ debug("remote forward %s for: listen %s%s%d, connect %s:%d",
+ type == SSH2_MSG_REQUEST_SUCCESS ? "success" : "failure",
+ rfwd->listen_path ? rfwd->listen_path :
+ rfwd->listen_host ? rfwd->listen_host : "",
+ (rfwd->listen_path || rfwd->listen_host) ? ":" : "",
+ rfwd->listen_port, rfwd->connect_path ? rfwd->connect_path :
+ rfwd->connect_host, rfwd->connect_port);
+ if (rfwd->listen_path == NULL && rfwd->listen_port == 0) {
+ if (type == SSH2_MSG_REQUEST_SUCCESS) {
+ if ((r = sshpkt_get_u32(ssh, &port)) != 0)
+ fatal_fr(r, "parse packet");
+ if (port > 65535) {
+ error("Invalid allocated port %u for remote "
+ "forward to %s:%d", port,
+ rfwd->connect_host, rfwd->connect_port);
+ /* Ensure failure processing runs below */
+ type = SSH2_MSG_REQUEST_FAILURE;
+ channel_update_permission(ssh,
+ rfwd->handle, -1);
+ } else {
+ rfwd->allocated_port = (int)port;
+ logit("Allocated port %u for remote "
+ "forward to %s:%d",
+ rfwd->allocated_port, rfwd->connect_path ?
+ rfwd->connect_path : rfwd->connect_host,
+ rfwd->connect_port);
+ channel_update_permission(ssh,
+ rfwd->handle, rfwd->allocated_port);
+ }
+ } else {
+ channel_update_permission(ssh, rfwd->handle, -1);
+ }
+ }
+
+ if (type == SSH2_MSG_REQUEST_FAILURE) {
+ if (options.exit_on_forward_failure) {
+ if (rfwd->listen_path != NULL)
+ fatal("Error: remote port forwarding failed "
+ "for listen path %s", rfwd->listen_path);
+ else
+ fatal("Error: remote port forwarding failed "
+ "for listen port %d", rfwd->listen_port);
+ } else {
+ if (rfwd->listen_path != NULL)
+ logit("Warning: remote port forwarding failed "
+ "for listen path %s", rfwd->listen_path);
+ else
+ logit("Warning: remote port forwarding failed "
+ "for listen port %d", rfwd->listen_port);
+ }
+ }
+ forwarding_success();
+}
+
+static void
+client_cleanup_stdio_fwd(struct ssh *ssh, int id, int force, void *arg)
+{
+ debug("stdio forwarding: done");
+ cleanup_exit(0);
+}
+
+static void
+ssh_stdio_confirm(struct ssh *ssh, int id, int success, void *arg)
+{
+ if (!success)
+ fatal("stdio forwarding failed");
+}
+
+static void
+ssh_tun_confirm(struct ssh *ssh, int id, int success, void *arg)
+{
+ if (!success) {
+ error("Tunnel forwarding failed");
+ if (options.exit_on_forward_failure)
+ cleanup_exit(255);
+ }
+
+ debug_f("tunnel forward established, id=%d", id);
+ forwarding_success();
+}
+
+static void
+ssh_init_stdio_forwarding(struct ssh *ssh)
+{
+ Channel *c;
+ int in, out;
+
+ if (options.stdio_forward_host == NULL)
+ return;
+
+ debug3_f("%s:%d", options.stdio_forward_host,
+ options.stdio_forward_port);
+
+ if ((in = dup(STDIN_FILENO)) == -1 ||
+ (out = dup(STDOUT_FILENO)) == -1)
+ fatal_f("dup() in/out failed");
+ if ((c = channel_connect_stdio_fwd(ssh, options.stdio_forward_host,
+ options.stdio_forward_port, in, out,
+ CHANNEL_NONBLOCK_STDIO)) == NULL)
+ fatal_f("channel_connect_stdio_fwd failed");
+ channel_register_cleanup(ssh, c->self, client_cleanup_stdio_fwd, 0);
+ channel_register_open_confirm(ssh, c->self, ssh_stdio_confirm, NULL);
+}
+
+static void
+ssh_init_forward_permissions(struct ssh *ssh, const char *what, char **opens,
+ u_int num_opens)
+{
+ u_int i;
+ int port;
+ char *addr, *arg, *oarg;
+ int where = FORWARD_LOCAL;
+
+ channel_clear_permission(ssh, FORWARD_ADM, where);
+ if (num_opens == 0)
+ return; /* permit any */
+
+ /* handle keywords: "any" / "none" */
+ if (num_opens == 1 && strcmp(opens[0], "any") == 0)
+ return;
+ if (num_opens == 1 && strcmp(opens[0], "none") == 0) {
+ channel_disable_admin(ssh, where);
+ return;
+ }
+ /* Otherwise treat it as a list of permitted host:port */
+ for (i = 0; i < num_opens; i++) {
+ oarg = arg = xstrdup(opens[i]);
+ addr = hpdelim(&arg);
+ if (addr == NULL)
+ fatal_f("missing host in %s", what);
+ addr = cleanhostname(addr);
+ if (arg == NULL || ((port = permitopen_port(arg)) < 0))
+ fatal_f("bad port number in %s", what);
+ /* Send it to channels layer */
+ channel_add_permission(ssh, FORWARD_ADM,
+ where, addr, port);
+ free(oarg);
+ }
+}
+
+static void
+ssh_init_forwarding(struct ssh *ssh, char **ifname)
+{
+ int success = 0;
+ int i;
+
+ ssh_init_forward_permissions(ssh, "permitremoteopen",
+ options.permitted_remote_opens,
+ options.num_permitted_remote_opens);
+
+ if (options.exit_on_forward_failure)
+ forward_confirms_pending = 0; /* track pending requests */
+ /* Initiate local TCP/IP port forwardings. */
+ for (i = 0; i < options.num_local_forwards; i++) {
+ debug("Local connections to %.200s:%d forwarded to remote "
+ "address %.200s:%d",
+ (options.local_forwards[i].listen_path != NULL) ?
+ options.local_forwards[i].listen_path :
+ (options.local_forwards[i].listen_host == NULL) ?
+ (options.fwd_opts.gateway_ports ? "*" : "LOCALHOST") :
+ options.local_forwards[i].listen_host,
+ options.local_forwards[i].listen_port,
+ (options.local_forwards[i].connect_path != NULL) ?
+ options.local_forwards[i].connect_path :
+ options.local_forwards[i].connect_host,
+ options.local_forwards[i].connect_port);
+ success += channel_setup_local_fwd_listener(ssh,
+ &options.local_forwards[i], &options.fwd_opts);
+ }
+ if (i > 0 && success != i && options.exit_on_forward_failure)
+ fatal("Could not request local forwarding.");
+ if (i > 0 && success == 0)
+ error("Could not request local forwarding.");
+
+ /* Initiate remote TCP/IP port forwardings. */
+ for (i = 0; i < options.num_remote_forwards; i++) {
+ debug("Remote connections from %.200s:%d forwarded to "
+ "local address %.200s:%d",
+ (options.remote_forwards[i].listen_path != NULL) ?
+ options.remote_forwards[i].listen_path :
+ (options.remote_forwards[i].listen_host == NULL) ?
+ "LOCALHOST" : options.remote_forwards[i].listen_host,
+ options.remote_forwards[i].listen_port,
+ (options.remote_forwards[i].connect_path != NULL) ?
+ options.remote_forwards[i].connect_path :
+ options.remote_forwards[i].connect_host,
+ options.remote_forwards[i].connect_port);
+ if ((options.remote_forwards[i].handle =
+ channel_request_remote_forwarding(ssh,
+ &options.remote_forwards[i])) >= 0) {
+ client_register_global_confirm(
+ ssh_confirm_remote_forward,
+ &options.remote_forwards[i]);
+ forward_confirms_pending++;
+ } else if (options.exit_on_forward_failure)
+ fatal("Could not request remote forwarding.");
+ else
+ logit("Warning: Could not request remote forwarding.");
+ }
+
+ /* Initiate tunnel forwarding. */
+ if (options.tun_open != SSH_TUNMODE_NO) {
+ if ((*ifname = client_request_tun_fwd(ssh,
+ options.tun_open, options.tun_local,
+ options.tun_remote, ssh_tun_confirm, NULL)) != NULL)
+ forward_confirms_pending++;
+ else if (options.exit_on_forward_failure)
+ fatal("Could not request tunnel forwarding.");
+ else
+ error("Could not request tunnel forwarding.");
+ }
+ if (forward_confirms_pending > 0) {
+ debug_f("expecting replies for %d forwards",
+ forward_confirms_pending);
+ }
+}
+
+static void
+check_agent_present(void)
+{
+ int r;
+
+ if (options.forward_agent) {
+ /* Clear agent forwarding if we don't have an agent. */
+ if ((r = ssh_get_authentication_socket(NULL)) != 0) {
+ options.forward_agent = 0;
+ if (r != SSH_ERR_AGENT_NOT_PRESENT)
+ debug_r(r, "ssh_get_authentication_socket");
+ }
+ }
+}
+
+static void
+ssh_session2_setup(struct ssh *ssh, int id, int success, void *arg)
+{
+ extern char **environ;
+ const char *display, *term;
+ int r, interactive = tty_flag;
+ char *proto = NULL, *data = NULL;
+
+ if (!success)
+ return; /* No need for error message, channels code sends one */
+
+ display = getenv("DISPLAY");
+ if (display == NULL && options.forward_x11)
+ debug("X11 forwarding requested but DISPLAY not set");
+ if (options.forward_x11 && client_x11_get_proto(ssh, display,
+ options.xauth_location, options.forward_x11_trusted,
+ options.forward_x11_timeout, &proto, &data) == 0) {
+ /* Request forwarding with authentication spoofing. */
+ debug("Requesting X11 forwarding with authentication "
+ "spoofing.");
+ x11_request_forwarding_with_spoofing(ssh, id, display, proto,
+ data, 1);
+ client_expect_confirm(ssh, id, "X11 forwarding", CONFIRM_WARN);
+ /* XXX exit_on_forward_failure */
+ interactive = 1;
+ }
+
+ check_agent_present();
+ if (options.forward_agent) {
+ debug("Requesting authentication agent forwarding.");
+ channel_request_start(ssh, id, "auth-agent-req@openssh.com", 0);
+ if ((r = sshpkt_send(ssh)) != 0)
+ fatal_fr(r, "send packet");
+ }
+
+ /* Tell the packet module whether this is an interactive session. */
+ ssh_packet_set_interactive(ssh, interactive,
+ options.ip_qos_interactive, options.ip_qos_bulk);
+
+ if ((term = lookup_env_in_list("TERM", options.setenv,
+ options.num_setenv)) == NULL || *term == '\0')
+ term = getenv("TERM");
+ client_session2_setup(ssh, id, tty_flag,
+ options.session_type == SESSION_TYPE_SUBSYSTEM, term,
+ NULL, fileno(stdin), command, environ);
+}
+
+/* open new channel for a session */
+static int
+ssh_session2_open(struct ssh *ssh)
+{
+ Channel *c;
+ int window, packetmax, in, out, err;
+
+ if (options.stdin_null) {
+ in = open(_PATH_DEVNULL, O_RDONLY);
+ } else {
+ in = dup(STDIN_FILENO);
+ }
+ out = dup(STDOUT_FILENO);
+ err = dup(STDERR_FILENO);
+
+ if (in == -1 || out == -1 || err == -1)
+ fatal("dup() in/out/err failed");
+
+ window = CHAN_SES_WINDOW_DEFAULT;
+ packetmax = CHAN_SES_PACKET_DEFAULT;
+ if (tty_flag) {
+ window >>= 1;
+ packetmax >>= 1;
+ }
+ c = channel_new(ssh,
+ "session", SSH_CHANNEL_OPENING, in, out, err,
+ window, packetmax, CHAN_EXTENDED_WRITE,
+ "client-session", CHANNEL_NONBLOCK_STDIO);
+
+ debug3_f("channel_new: %d", c->self);
+
+ channel_send_open(ssh, c->self);
+ if (options.session_type != SESSION_TYPE_NONE)
+ channel_register_open_confirm(ssh, c->self,
+ ssh_session2_setup, NULL);
+
+ return c->self;
+}
+
+static int
+ssh_session2(struct ssh *ssh, const struct ssh_conn_info *cinfo)
+{
+ int r, id = -1;
+ char *cp, *tun_fwd_ifname = NULL;
+
+ /* XXX should be pre-session */
+ if (!options.control_persist)
+ ssh_init_stdio_forwarding(ssh);
+
+ ssh_init_forwarding(ssh, &tun_fwd_ifname);
+
+ if (options.local_command != NULL) {
+ debug3("expanding LocalCommand: %s", options.local_command);
+ cp = options.local_command;
+ options.local_command = percent_expand(cp,
+ DEFAULT_CLIENT_PERCENT_EXPAND_ARGS(cinfo),
+ "T", tun_fwd_ifname == NULL ? "NONE" : tun_fwd_ifname,
+ (char *)NULL);
+ debug3("expanded LocalCommand: %s", options.local_command);
+ free(cp);
+ }
+
+ /* Start listening for multiplex clients */
+ if (!ssh_packet_get_mux(ssh))
+ muxserver_listen(ssh);
+
+ /*
+ * If we are in control persist mode and have a working mux listen
+ * socket, then prepare to background ourselves and have a foreground
+ * client attach as a control client.
+ * NB. we must save copies of the flags that we override for
+ * the backgrounding, since we defer attachment of the client until
+ * after the connection is fully established (in particular,
+ * async rfwd replies have been received for ExitOnForwardFailure).
+ */
+ if (options.control_persist && muxserver_sock != -1) {
+ ostdin_null_flag = options.stdin_null;
+ osession_type = options.session_type;
+ orequest_tty = options.request_tty;
+ otty_flag = tty_flag;
+ options.stdin_null = 1;
+ options.session_type = SESSION_TYPE_NONE;
+ tty_flag = 0;
+ if (!options.fork_after_authentication &&
+ (osession_type != SESSION_TYPE_NONE ||
+ options.stdio_forward_host != NULL))
+ need_controlpersist_detach = 1;
+ options.fork_after_authentication = 1;
+ }
+ /*
+ * ControlPersist mux listen socket setup failed, attempt the
+ * stdio forward setup that we skipped earlier.
+ */
+ if (options.control_persist && muxserver_sock == -1)
+ ssh_init_stdio_forwarding(ssh);
+
+ if (options.session_type != SESSION_TYPE_NONE)
+ id = ssh_session2_open(ssh);
+ else {
+ ssh_packet_set_interactive(ssh,
+ options.control_master == SSHCTL_MASTER_NO,
+ options.ip_qos_interactive, options.ip_qos_bulk);
+ }
+
+ /* If we don't expect to open a new session, then disallow it */
+ if (options.control_master == SSHCTL_MASTER_NO &&
+ (ssh->compat & SSH_NEW_OPENSSH)) {
+ debug("Requesting no-more-sessions@openssh.com");
+ if ((r = sshpkt_start(ssh, SSH2_MSG_GLOBAL_REQUEST)) != 0 ||
+ (r = sshpkt_put_cstring(ssh,
+ "no-more-sessions@openssh.com")) != 0 ||
+ (r = sshpkt_put_u8(ssh, 0)) != 0 ||
+ (r = sshpkt_send(ssh)) != 0)
+ fatal_fr(r, "send packet");
+ }
+
+ /* Execute a local command */
+ if (options.local_command != NULL &&
+ options.permit_local_command)
+ ssh_local_cmd(options.local_command);
+
+ /*
+ * stdout is now owned by the session channel; clobber it here
+ * so future channel closes are propagated to the local fd.
+ * NB. this can only happen after LocalCommand has completed,
+ * as it may want to write to stdout.
+ */
+ if (!need_controlpersist_detach && stdfd_devnull(0, 1, 0) == -1)
+ error_f("stdfd_devnull failed");
+
+ /*
+ * If requested and we are not interested in replies to remote
+ * forwarding requests, then let ssh continue in the background.
+ */
+ if (options.fork_after_authentication) {
+ if (options.exit_on_forward_failure &&
+ options.num_remote_forwards > 0) {
+ debug("deferring postauth fork until remote forward "
+ "confirmation received");
+ } else
+ fork_postauth();
+ }
+
+ return client_loop(ssh, tty_flag, tty_flag ?
+ options.escape_char : SSH_ESCAPECHAR_NONE, id);
+}
+
+/* Loads all IdentityFile and CertificateFile keys */
+static void
+load_public_identity_files(const struct ssh_conn_info *cinfo)
+{
+ char *filename, *cp;
+ struct sshkey *public;
+ int i;
+ u_int n_ids, n_certs;
+ char *identity_files[SSH_MAX_IDENTITY_FILES];
+ struct sshkey *identity_keys[SSH_MAX_IDENTITY_FILES];
+ int identity_file_userprovided[SSH_MAX_IDENTITY_FILES];
+ char *certificate_files[SSH_MAX_CERTIFICATE_FILES];
+ struct sshkey *certificates[SSH_MAX_CERTIFICATE_FILES];
+ int certificate_file_userprovided[SSH_MAX_CERTIFICATE_FILES];
+#ifdef ENABLE_PKCS11
+ struct sshkey **keys = NULL;
+ char **comments = NULL;
+ int nkeys;
+#endif /* PKCS11 */
+
+ n_ids = n_certs = 0;
+ memset(identity_files, 0, sizeof(identity_files));
+ memset(identity_keys, 0, sizeof(identity_keys));
+ memset(identity_file_userprovided, 0,
+ sizeof(identity_file_userprovided));
+ memset(certificate_files, 0, sizeof(certificate_files));
+ memset(certificates, 0, sizeof(certificates));
+ memset(certificate_file_userprovided, 0,
+ sizeof(certificate_file_userprovided));
+
+#ifdef ENABLE_PKCS11
+ if (options.pkcs11_provider != NULL &&
+ options.num_identity_files < SSH_MAX_IDENTITY_FILES &&
+ (pkcs11_init(!options.batch_mode) == 0) &&
+ (nkeys = pkcs11_add_provider(options.pkcs11_provider, NULL,
+ &keys, &comments)) > 0) {
+ for (i = 0; i < nkeys; i++) {
+ if (n_ids >= SSH_MAX_IDENTITY_FILES) {
+ sshkey_free(keys[i]);
+ free(comments[i]);
+ continue;
+ }
+ identity_keys[n_ids] = keys[i];
+ identity_files[n_ids] = comments[i]; /* transferred */
+ n_ids++;
+ }
+ free(keys);
+ free(comments);
+ }
+#endif /* ENABLE_PKCS11 */
+ for (i = 0; i < options.num_identity_files; i++) {
+ if (n_ids >= SSH_MAX_IDENTITY_FILES ||
+ strcasecmp(options.identity_files[i], "none") == 0) {
+ free(options.identity_files[i]);
+ options.identity_files[i] = NULL;
+ continue;
+ }
+ cp = tilde_expand_filename(options.identity_files[i], getuid());
+ filename = default_client_percent_dollar_expand(cp, cinfo);
+ free(cp);
+ check_load(sshkey_load_public(filename, &public, NULL),
+ &public, filename, "pubkey");
+ debug("identity file %s type %d", filename,
+ public ? public->type : -1);
+ free(options.identity_files[i]);
+ identity_files[n_ids] = filename;
+ identity_keys[n_ids] = public;
+ identity_file_userprovided[n_ids] =
+ options.identity_file_userprovided[i];
+ if (++n_ids >= SSH_MAX_IDENTITY_FILES)
+ continue;
+
+ /*
+ * If no certificates have been explicitly listed then try
+ * to add the default certificate variant too.
+ */
+ if (options.num_certificate_files != 0)
+ continue;
+ xasprintf(&cp, "%s-cert", filename);
+ check_load(sshkey_load_public(cp, &public, NULL),
+ &public, filename, "pubkey");
+ debug("identity file %s type %d", cp,
+ public ? public->type : -1);
+ if (public == NULL) {
+ free(cp);
+ continue;
+ }
+ if (!sshkey_is_cert(public)) {
+ debug_f("key %s type %s is not a certificate",
+ cp, sshkey_type(public));
+ sshkey_free(public);
+ free(cp);
+ continue;
+ }
+ /* NB. leave filename pointing to private key */
+ identity_files[n_ids] = xstrdup(filename);
+ identity_keys[n_ids] = public;
+ identity_file_userprovided[n_ids] =
+ options.identity_file_userprovided[i];
+ n_ids++;
+ }
+
+ if (options.num_certificate_files > SSH_MAX_CERTIFICATE_FILES)
+ fatal_f("too many certificates");
+ for (i = 0; i < options.num_certificate_files; i++) {
+ cp = tilde_expand_filename(options.certificate_files[i],
+ getuid());
+ filename = default_client_percent_dollar_expand(cp, cinfo);
+ free(cp);
+
+ check_load(sshkey_load_public(filename, &public, NULL),
+ &public, filename, "certificate");
+ debug("certificate file %s type %d", filename,
+ public ? public->type : -1);
+ free(options.certificate_files[i]);
+ options.certificate_files[i] = NULL;
+ if (public == NULL) {
+ free(filename);
+ continue;
+ }
+ if (!sshkey_is_cert(public)) {
+ debug_f("key %s type %s is not a certificate",
+ filename, sshkey_type(public));
+ sshkey_free(public);
+ free(filename);
+ continue;
+ }
+ certificate_files[n_certs] = filename;
+ certificates[n_certs] = public;
+ certificate_file_userprovided[n_certs] =
+ options.certificate_file_userprovided[i];
+ ++n_certs;
+ }
+
+ options.num_identity_files = n_ids;
+ memcpy(options.identity_files, identity_files, sizeof(identity_files));
+ memcpy(options.identity_keys, identity_keys, sizeof(identity_keys));
+ memcpy(options.identity_file_userprovided,
+ identity_file_userprovided, sizeof(identity_file_userprovided));
+
+ options.num_certificate_files = n_certs;
+ memcpy(options.certificate_files,
+ certificate_files, sizeof(certificate_files));
+ memcpy(options.certificates, certificates, sizeof(certificates));
+ memcpy(options.certificate_file_userprovided,
+ certificate_file_userprovided,
+ sizeof(certificate_file_userprovided));
+}
+
+static void
+main_sigchld_handler(int sig)
+{
+ int save_errno = errno;
+ pid_t pid;
+ int status;
+
+ while ((pid = waitpid(-1, &status, WNOHANG)) > 0 ||
+ (pid == -1 && errno == EINTR))
+ ;
+ errno = save_errno;
+}