| /* $OpenBSD: ssh.c,v 1.521 2020/03/06 18:20:02 markus 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 SSL 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 "digest.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; |
| |
| /* don't exec a shell */ |
| int no_shell_flag = 0; |
| |
| /* |
| * Flag indicating that nothing should be read from stdin. This can be set |
| * on the command line. |
| */ |
| int stdin_null_flag = 0; |
| |
| /* |
| * Flag indicating that the current process should be backgrounded and |
| * a new slave launched in the foreground for ControlPersist. |
| */ |
| int need_controlpersist_detach = 0; |
| |
| /* Copies of flags for ControlPersist foreground slave */ |
| int ostdin_null_flag, ono_shell_flag, otty_flag, orequest_tty; |
| |
| /* |
| * Flag indicating that ssh should fork after authentication. This is useful |
| * so that the passphrase can be entered manually, and then ssh goes to the |
| * background. |
| */ |
| int fork_after_authentication_flag = 0; |
| |
| /* |
| * 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; |
| |
| /* Various strings used to to percent_expand() arguments */ |
| static char thishost[NI_MAXHOST], shorthost[NI_MAXHOST], portstr[NI_MAXSERV]; |
| static char uidstr[32], *host_arg, *conn_hash_hex; |
| |
| /* socket address the host resolves to */ |
| struct sockaddr_storage hostaddr; |
| |
| /* Private host keys. */ |
| Sensitive sensitive_data; |
| |
| /* command to be executed */ |
| struct sshbuf *command; |
| |
| /* Should we execute a command or invoke a subsystem? */ |
| int subsystem_flag = 0; |
| |
| /* # of replies received for global requests */ |
| static int remote_forward_confirms_received = 0; |
| |
| /* 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]\n" |
| ); |
| exit(255); |
| } |
| |
| static int ssh_session2(struct ssh *, struct passwd *); |
| static void load_public_identity_files(struct passwd *); |
| 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; |
| } |
| } |
| |
| /* |
| * 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]; |
| struct addrinfo hints, *res; |
| int gaierr; |
| LogLevel loglevel = SYSLOG_LEVEL_DEBUG1; |
| |
| if (port <= 0) |
| port = default_ssh_port(); |
| if (cname != NULL) |
| *cname = '\0'; |
| |
| 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 (strlcpy(cname, res->ai_canonname, clen) >= clen) { |
| error("%s: host \"%s\" cname \"%s\" too long (max %lu)", |
| __func__, 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("%s: could not resolve name %.100s as address: %s", |
| __func__, name, ssh_gai_strerror(gaierr)); |
| return NULL; |
| } |
| if (res == NULL) { |
| debug("%s: getaddrinfo %.100s returned no addresses", |
| __func__, name); |
| return NULL; |
| } |
| if (res->ai_next != NULL) { |
| debug("%s: getaddrinfo %.100s returned multiple addresses", |
| __func__, name); |
| goto fail; |
| } |
| if ((gaierr = getnameinfo(res->ai_addr, res->ai_addrlen, |
| addr, sizeof(addr), NULL, 0, NI_NUMERICHOST)) != 0) { |
| debug("%s: Could not format address for name %.100s: %s", |
| __func__, name, ssh_gai_strerror(gaierr)); |
| goto fail; |
| } |
| if (strlcpy(caddr, addr, clen) >= clen) { |
| error("%s: host \"%s\" addr \"%s\" too long (max %lu)", |
| __func__, 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' || options.num_permitted_cnames == 0 || |
| 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("%s: check \"%s\" CNAME \"%s\"", __func__, *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("%s: hostname %.100s is address", __func__, *hostp); |
| if (strcasecmp(*hostp, newname) != 0) { |
| debug2("%s: canonicalised address \"%s\" => \"%s\"", |
| __func__, *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("%s: hostname %.100s is an unrecognised address", |
| __func__, *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("%s: name is fully qualified", __func__); |
| 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("%s: not canonicalizing hostname \"%s\" (max dots %d)", |
| __func__, *hostp, options.canonicalize_max_dots); |
| return NULL; |
| } |
| /* Attempt each supplied suffix */ |
| for (i = 0; i < options.num_canonical_domains; i++) { |
| xasprintf(&fullhost, "%s.%s.", *hostp, |
| options.canonical_domains[i]); |
| debug3("%s: attempting \"%s\" => \"%s\"", __func__, |
| *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("%s: host %s not found in any suffix", __func__, *hostp); |
| return NULL; |
| } |
| |
| /* |
| * Check the result of hostkey loading, ignoring some errors and |
| * fatal()ing for others. |
| */ |
| static void |
| check_load(int r, const char *path, const char *message) |
| { |
| switch (r) { |
| case 0: |
| break; |
| case SSH_ERR_INTERNAL_ERROR: |
| case SSH_ERR_ALLOC_FAIL: |
| fatal("load %s \"%s\": %s", message, path, ssh_err(r)); |
| case SSH_ERR_SYSTEM_ERROR: |
| /* Ignore missing files */ |
| if (errno == ENOENT) |
| break; |
| /* FALLTHROUGH */ |
| default: |
| error("load %s \"%s\": %s", message, path, ssh_err(r)); |
| 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; |
| } |
| } |
| } |
| |
| /* |
| * 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, buf[PATH_MAX], *logfile; |
| char cname[NI_MAXHOST]; |
| struct stat st; |
| struct passwd *pw; |
| extern int optind, optreset; |
| extern char *optarg; |
| struct Forward fwd; |
| struct addrinfo *addrs = NULL; |
| struct ssh_digest_ctx *md; |
| u_char conn_hash[SSH_DIGEST_MAX_LENGTH]; |
| size_t n, len; |
| |
| /* 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 |
| |
| seed_rng(); |
| |
| /* |
| * Discard other fds that are hanging around. These can cause problem |
| * with backgrounded ssh processes started by ControlPersist. |
| */ |
| closefrom(STDERR_FILENO + 1); |
| |
| /* 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); |
| |
| 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) { |
| 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': |
| 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 = 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 || |
| strcasecmp(optarg, "HostKeyAlgorithms") == 0 || |
| strcasecmp(optarg, "HostbasedKeyTypes") == 0 || |
| strcasecmp(optarg, "HostbasedAcceptedKeyTypes") == 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, |
| #ifdef WITH_OPENSSL |
| OpenSSL_version(OPENSSL_VERSION) |
| #else |
| "without OpenSSL" |
| #endif |
| ); |
| 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 (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; |
| no_shell_flag = 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 == '+' || *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': |
| no_shell_flag = 1; |
| 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': |
| subsystem_flag = 1; |
| 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(); |
| |
| 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 (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 ((r = sshbuf_putf(command, "%s%s", |
| i ? " " : "", av[i])) != 0) |
| fatal("%s: buffer error: %s", |
| __func__, ssh_err(r)); |
| } |
| } |
| |
| /* |
| * 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, |
| #ifdef WITH_OPENSSL |
| OpenSSL_version(OPENSSL_VERSION) |
| #else |
| "without OpenSSL" |
| #endif |
| ); |
| |
| /* Parse the configuration files */ |
| process_config_files(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 && options.num_permitted_cnames != 0 && (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(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. */ |
| fill_default_options(&options); |
| |
| /* |
| * If ProxyJump option specified, then construct a ProxyCommand now. |
| */ |
| if (options.jump_host != NULL) { |
| char port_s[8]; |
| const char *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 (strcmp(options.jump_host, host) == 0 && port == jumpport) |
| 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" argumment 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 (fork_after_authentication_flag && sshbuf_len(command) == 0 && |
| options.remote_command == NULL && !no_shell_flag) |
| fatal("Cannot fork into background without a command " |
| "to execute."); |
| |
| /* reinit */ |
| log_init(argv0, options.log_level, options.log_facility, !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 (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)) |
| 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; |
| } |
| |
| if (options.user == NULL) |
| options.user = xstrdup(pw->pw_name); |
| |
| /* Set up strings used to percent_expand() arguments */ |
| 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); |
| snprintf(uidstr, sizeof(uidstr), "%llu", |
| (unsigned long long)pw->pw_uid); |
| |
| if ((md = ssh_digest_start(SSH_DIGEST_SHA1)) == NULL || |
| ssh_digest_update(md, thishost, strlen(thishost)) < 0 || |
| ssh_digest_update(md, host, strlen(host)) < 0 || |
| ssh_digest_update(md, portstr, strlen(portstr)) < 0 || |
| ssh_digest_update(md, options.user, strlen(options.user)) < 0 || |
| ssh_digest_final(md, conn_hash, sizeof(conn_hash)) < 0) |
| fatal("%s: mux digest failed", __func__); |
| ssh_digest_free(md); |
| conn_hash_hex = tohex(conn_hash, ssh_digest_bytes(SSH_DIGEST_SHA1)); |
| |
| /* |
| * 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 = percent_expand(cp, |
| "C", conn_hash_hex, |
| "L", shorthost, |
| "d", pw->pw_dir, |
| "h", host, |
| "i", uidstr, |
| "l", thishost, |
| "n", host_arg, |
| "p", portstr, |
| "r", options.user, |
| "u", pw->pw_name, |
| (char *)NULL); |
| debug3("expanded RemoteCommand: %s", options.remote_command); |
| free(cp); |
| if ((r = sshbuf_put(command, options.remote_command, |
| strlen(options.remote_command))) != 0) |
| fatal("%s: buffer error: %s", __func__, ssh_err(r)); |
| } |
| |
| if (options.control_path != NULL) { |
| cp = tilde_expand_filename(options.control_path, getuid()); |
| free(options.control_path); |
| options.control_path = percent_expand(cp, |
| "C", conn_hash_hex, |
| "L", shorthost, |
| "h", host, |
| "i", uidstr, |
| "l", thishost, |
| "n", host_arg, |
| "p", portstr, |
| "r", options.user, |
| "u", pw->pw_name, |
| "i", uidstr, |
| (char *)NULL); |
| 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 */ |
| } |
| |
| timeout_ms = options.connection_timeout * 1000; |
| |
| /* Open a connection to the remote host. */ |
| if (ssh_connect(ssh, host, host_arg, addrs, &hostaddr, options.port, |
| options.address_family, 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) { |
| sensitive_data.nkeys = 10; |
| sensitive_data.keys = xcalloc(sensitive_data.nkeys, |
| sizeof(struct sshkey)); |
| |
| /* XXX check errors? */ |
| #define L_PUBKEY(p,o) do { \ |
| if ((o) >= sensitive_data.nkeys) \ |
| fatal("%s pubkey out of array bounds", __func__); \ |
| check_load(sshkey_load_public(p, &(sensitive_data.keys[o]), NULL), \ |
| p, "pubkey"); \ |
| } while (0) |
| #define L_CERT(p,o) do { \ |
| if ((o) >= sensitive_data.nkeys) \ |
| fatal("%s cert out of array bounds", __func__); \ |
| check_load(sshkey_load_cert(p, &(sensitive_data.keys[o])), p, "cert"); \ |
| } 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); |
| } |
| } |
| |
| /* Create ~/.ssh * directory if it doesn't already exist. */ |
| if (config == NULL) { |
| r = snprintf(buf, sizeof buf, "%s%s%s", pw->pw_dir, |
| strcmp(pw->pw_dir, "/") ? "/" : "", _PATH_SSH_USER_DIR); |
| if (r > 0 && (size_t)r < sizeof(buf) && stat(buf, &st) == -1) { |
| #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(pw); |
| |
| /* 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 { |
| p = tilde_expand_filename(options.identity_agent, |
| getuid()); |
| cp = percent_expand(p, |
| "d", pw->pw_dir, |
| "h", host, |
| "i", uidstr, |
| "l", thishost, |
| "r", options.user, |
| "u", pw->pw_name, |
| (char *)NULL); |
| free(p); |
| /* |
| * If identity_agent represents an environment variable |
| * then recheck that it is valid (since processing with |
| * percent_expand() may have changed it) and substitute |
| * its value. |
| */ |
| if (cp[0] == '$') { |
| 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); |
| } |
| free(cp); |
| } |
| } |
| |
| if (options.forward_agent && (options.forward_agent_sock_path != NULL)) { |
| p = tilde_expand_filename(options.forward_agent_sock_path, getuid()); |
| cp = percent_expand(p, |
| "d", pw->pw_dir, |
| "h", host, |
| "i", uidstr, |
| "l", thishost, |
| "r", options.user, |
| "u", pw->pw_name, |
| (char *)NULL); |
| free(p); |
| |
| 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 = 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(SIGPIPE, SIG_IGN); /* ignore SIGPIPE early */ |
| 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); |
| |
| if (ssh_packet_connection_is_on_socket(ssh)) { |
| verbose("Authenticated to %s ([%s]:%d).", host, |
| ssh_remote_ipaddr(ssh), ssh_remote_port(ssh)); |
| } 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); |
| 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; |
| } |
| |
| skip_connect: |
| exit_status = ssh_session2(ssh, pw); |
| 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; |
| int devnull, keep_stderr; |
| |
| debug("%s: backgrounding master process", __func__); |
| |
| /* |
| * master (current process) into the background, and make the |
| * foreground process a client of the backgrounded master. |
| */ |
| switch ((pid = fork())) { |
| case -1: |
| fatal("%s: fork: %s", __func__, strerror(errno)); |
| case 0: |
| /* Child: master process continues mainloop */ |
| break; |
| default: |
| /* Parent: set up mux slave to connect to backgrounded master */ |
| debug2("%s: background process is %ld", __func__, (long)pid); |
| stdin_null_flag = ostdin_null_flag; |
| options.request_tty = orequest_tty; |
| tty_flag = otty_flag; |
| 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 ((devnull = open(_PATH_DEVNULL, O_RDWR)) == -1) { |
| error("%s: open(\"/dev/null\"): %s", __func__, |
| strerror(errno)); |
| } else { |
| keep_stderr = log_is_on_stderr() && debug_flag; |
| if (dup2(devnull, STDIN_FILENO) == -1 || |
| dup2(devnull, STDOUT_FILENO) == -1 || |
| (!keep_stderr && dup2(devnull, STDERR_FILENO) == -1)) |
| error("%s: dup2: %s", __func__, strerror(errno)); |
| if (devnull > STDERR_FILENO) |
| close(devnull); |
| } |
| 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"); |
| fork_after_authentication_flag = 0; |
| if (daemon(1, 1) == -1) |
| fatal("daemon() failed: %.200s", strerror(errno)); |
| } |
| |
| /* 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("%s: %s", __func__, ssh_err(r)); |
| 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_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); |
| } |
| } |
| if (++remote_forward_confirms_received == options.num_remote_forwards) { |
| debug("All remote forwarding requests processed"); |
| if (fork_after_authentication_flag) |
| fork_postauth(); |
| } |
| } |
| |
| static void |
| client_cleanup_stdio_fwd(struct ssh *ssh, int id, 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_init_stdio_forwarding(struct ssh *ssh) |
| { |
| Channel *c; |
| int in, out; |
| |
| if (options.stdio_forward_host == NULL) |
| return; |
| |
| debug3("%s: %s:%d", __func__, options.stdio_forward_host, |
| options.stdio_forward_port); |
| |
| if ((in = dup(STDIN_FILENO)) == -1 || |
| (out = dup(STDOUT_FILENO)) == -1) |
| fatal("channel_connect_stdio_fwd: dup() in/out failed"); |
| if ((c = channel_connect_stdio_fwd(ssh, options.stdio_forward_host, |
| options.stdio_forward_port, in, out)) == NULL) |
| fatal("%s: channel_connect_stdio_fwd failed", __func__); |
| 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_forwarding(struct ssh *ssh, char **ifname) |
| { |
| int success = 0; |
| int i; |
| |
| /* 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); |
| options.remote_forwards[i].handle = |
| channel_request_remote_forwarding(ssh, |
| &options.remote_forwards[i]); |
| if (options.remote_forwards[i].handle < 0) { |
| if (options.exit_on_forward_failure) |
| fatal("Could not request remote forwarding."); |
| else |
| logit("Warning: Could not request remote " |
| "forwarding."); |
| } else { |
| client_register_global_confirm( |
| ssh_confirm_remote_forward, |
| &options.remote_forwards[i]); |
| } |
| } |
| |
| /* 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)) == NULL) { |
| if (options.exit_on_forward_failure) |
| fatal("Could not request tunnel forwarding."); |
| else |
| error("Could not request tunnel forwarding."); |
| } |
| } |
| } |
| |
| 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("ssh_get_authentication_socket: %s", |
| ssh_err(r)); |
| } |
| } |
| } |
| |
| static void |
| ssh_session2_setup(struct ssh *ssh, int id, int success, void *arg) |
| { |
| extern char **environ; |
| const char *display; |
| int r, interactive = tty_flag; |
| char *proto = NULL, *data = NULL; |
| |
| if (!success) |
| return; /* No need for error message, channels code sens 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("%s: %s", __func__, ssh_err(r)); |
| } |
| |
| /* Tell the packet module whether this is an interactive session. */ |
| ssh_packet_set_interactive(ssh, interactive, |
| options.ip_qos_interactive, options.ip_qos_bulk); |
| |
| client_session2_setup(ssh, id, tty_flag, subsystem_flag, getenv("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 (stdin_null_flag) { |
| 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"); |
| |
| /* enable nonblocking unless tty */ |
| if (!isatty(in)) |
| set_nonblock(in); |
| if (!isatty(out)) |
| set_nonblock(out); |
| if (!isatty(err)) |
| set_nonblock(err); |
| |
| 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", /*nonblock*/0); |
| |
| debug3("%s: channel_new: %d", __func__, c->self); |
| |
| channel_send_open(ssh, c->self); |
| if (!no_shell_flag) |
| channel_register_open_confirm(ssh, c->self, |
| ssh_session2_setup, NULL); |
| |
| return c->self; |
| } |
| |
| static int |
| ssh_session2(struct ssh *ssh, struct passwd *pw) |
| { |
| int r, devnull, 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, |
| "C", conn_hash_hex, |
| "L", shorthost, |
| "d", pw->pw_dir, |
| "h", host, |
| "i", uidstr, |
| "l", thishost, |
| "n", host_arg, |
| "p", portstr, |
| "r", options.user, |
| "u", pw->pw_name, |
| "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 slave. |
| * NB. we must save copies of the flags that we override for |
| * the backgrounding, since we defer attachment of the slave 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 = stdin_null_flag; |
| ono_shell_flag = no_shell_flag; |
| orequest_tty = options.request_tty; |
| otty_flag = tty_flag; |
| stdin_null_flag = 1; |
| no_shell_flag = 1; |
| tty_flag = 0; |
| if (!fork_after_authentication_flag) |
| need_controlpersist_detach = 1; |
| fork_after_authentication_flag = 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 (!no_shell_flag) |
| 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 && |
| (datafellows & 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("%s: %s", __func__, ssh_err(r)); |
| } |
| |
| /* 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) { |
| if ((devnull = open(_PATH_DEVNULL, O_WRONLY)) == -1) |
| error("%s: open %s: %s", __func__, |
| _PATH_DEVNULL, strerror(errno)); |
| if (dup2(devnull, STDOUT_FILENO) == -1) |
| fatal("%s: dup2() stdout failed", __func__); |
| if (devnull > STDERR_FILENO) |
| close(devnull); |
| } |
| |
| /* |
| * If requested and we are not interested in replies to remote |
| * forwarding requests, then let ssh continue in the background. |
| */ |
| if (fork_after_authentication_flag) { |
| 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(struct passwd *pw) |
| { |
| 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 = percent_expand(cp, "d", pw->pw_dir, |
| "u", pw->pw_name, "l", thishost, "h", host, |
| "r", options.user, (char *)NULL); |
| free(cp); |
| check_load(sshkey_load_public(filename, &public, NULL), |
| 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), |
| 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("%s: key %s type %s is not a certificate", |
| __func__, 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("%s: too many certificates", __func__); |
| for (i = 0; i < options.num_certificate_files; i++) { |
| cp = tilde_expand_filename(options.certificate_files[i], |
| getuid()); |
| filename = percent_expand(cp, |
| "d", pw->pw_dir, |
| "h", host, |
| "i", uidstr, |
| "l", thishost, |
| "r", options.user, |
| "u", pw->pw_name, |
| (char *)NULL); |
| free(cp); |
| |
| check_load(sshkey_load_public(filename, &public, NULL), |
| 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("%s: key %s type %s is not a certificate", |
| __func__, 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; |
| } |