[email protected]
0a0ef45153
set for ProxyJump/-J on the commandline as we do for destination user/host names. Specifically, they are no longer allowed to contain most characters that have special meaning for common shells. Special characters are still allowed in ProxyJump commands that are specified in the config files. This _reduces_ the chance that shell characters from a hostile -J option from ending up in a shell execution context. Don't pass untrusted stuff to the ssh commandline, it's not intended to be a security boundary. We try to make it safe where we can, but we can't make guarantees, because we can't know the parsing rules and special characters for all the shells in the world, nor can we know what the user does with this data in their ssh_config wrt percent expansion, LocalCommand, match exec, etc. While I'm in there, make ProxyJump and ProxyCommand first-match-wins between each other. reported by rabbit; ok dtucker@ OpenBSD-Commit-ID: f05ad8a1eb5f6735f9a935a71a90580226759263
265 lines
9.2 KiB
C
265 lines
9.2 KiB
C
/* $OpenBSD: readconf.h,v 1.163 2026/03/30 07:18:24 djm Exp $ */
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/*
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* Author: Tatu Ylonen <[email protected]>
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* Copyright (c) 1995 Tatu Ylonen <[email protected]>, Espoo, Finland
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* All rights reserved
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* Functions for reading the configuration file.
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*
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* As far as I am concerned, the code I have written for this software
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* can be used freely for any purpose. Any derived versions of this
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* software must be clearly marked as such, and if the derived work is
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* incompatible with the protocol description in the RFC file, it must be
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* called by a name other than "ssh" or "Secure Shell".
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*/
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#ifndef READCONF_H
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#define READCONF_H
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/* Data structure for representing option data. */
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#define SSH_MAX_HOSTS_FILES 32
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#define PATH_MAX_SUN (sizeof((struct sockaddr_un *)0)->sun_path)
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struct allowed_cname {
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char *source_list;
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char *target_list;
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};
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typedef struct {
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char *host_arg; /* Host arg as specified on command line. */
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int forward_agent; /* Forward authentication agent. */
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char *forward_agent_sock_path; /* Optional path of the agent. */
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int forward_x11; /* Forward X11 display. */
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int forward_x11_timeout; /* Expiration for Cookies */
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int forward_x11_trusted; /* Trust Forward X11 display. */
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int exit_on_forward_failure; /* Exit if bind(2) fails for -L/-R */
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char *xauth_location; /* Location for xauth program */
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struct ForwardOptions fwd_opts; /* forwarding options */
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int pubkey_authentication; /* Try ssh2 pubkey authentication. */
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int hostbased_authentication; /* ssh2's rhosts_rsa */
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int gss_authentication; /* Try GSS authentication */
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int gss_deleg_creds; /* Delegate GSS credentials */
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int password_authentication; /* Try password
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* authentication. */
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int kbd_interactive_authentication; /* Try keyboard-interactive auth. */
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char *kbd_interactive_devices; /* Keyboard-interactive auth devices. */
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int batch_mode; /* Batch mode: do not ask for passwords. */
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int check_host_ip; /* Also keep track of keys for IP address */
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int strict_host_key_checking; /* Strict host key checking. */
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int compression; /* Compress packets in both directions. */
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int tcp_keep_alive; /* Set SO_KEEPALIVE. */
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int ip_qos_interactive; /* DSCP value for interactive */
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int ip_qos_bulk; /* DSCP value for bulk traffic */
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SyslogFacility log_facility; /* Facility for system logging. */
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LogLevel log_level; /* Level for logging. */
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u_int num_log_verbose; /* Verbose log overrides */
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char **log_verbose;
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int port; /* Port to connect. */
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int address_family;
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int connection_attempts; /* Max attempts (seconds) before
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* giving up */
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int connection_timeout; /* Max time (seconds) before
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* aborting connection attempt */
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int number_of_password_prompts; /* Max number of password
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* prompts. */
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char *ciphers; /* SSH2 ciphers in order of preference. */
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char *macs; /* SSH2 macs in order of preference. */
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char *hostkeyalgorithms; /* SSH2 server key types in order of preference. */
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char *kex_algorithms; /* SSH2 kex methods in order of preference. */
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int kex_algorithms_set; /* KexAlgorithms was set by the user */
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char *ca_sign_algorithms; /* Allowed CA signature algorithms */
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char *hostname; /* Real host to connect. */
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char *tag; /* Configuration tag name. */
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char *host_key_alias; /* hostname alias for .ssh/known_hosts */
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char *proxy_command; /* Proxy command for connecting the host. */
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char *user; /* User to log in as. */
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int escape_char; /* Escape character; -2 = none */
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u_int num_system_hostfiles; /* Paths for /etc/ssh/ssh_known_hosts */
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char *system_hostfiles[SSH_MAX_HOSTS_FILES];
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u_int num_user_hostfiles; /* Path for $HOME/.ssh/known_hosts */
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char *user_hostfiles[SSH_MAX_HOSTS_FILES];
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char *preferred_authentications;
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char *bind_address; /* local socket address for connection to sshd */
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char *bind_interface; /* local interface for bind address */
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char *pkcs11_provider; /* PKCS#11 provider */
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char *sk_provider; /* Security key provider */
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int verify_host_key_dns; /* Verify host key using DNS */
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int num_identity_files; /* Number of files for identities. */
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char *identity_files[SSH_MAX_IDENTITY_FILES];
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int identity_file_userprovided[SSH_MAX_IDENTITY_FILES];
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struct sshkey *identity_keys[SSH_MAX_IDENTITY_FILES];
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int num_certificate_files; /* Number of extra certificates for ssh. */
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char *certificate_files[SSH_MAX_CERTIFICATE_FILES];
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int certificate_file_userprovided[SSH_MAX_CERTIFICATE_FILES];
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struct sshkey *certificates[SSH_MAX_CERTIFICATE_FILES];
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int add_keys_to_agent;
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int add_keys_to_agent_lifespan;
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char *identity_agent; /* Optional path to ssh-agent socket */
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/* Local TCP/IP forward requests. */
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int num_local_forwards;
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struct Forward *local_forwards;
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/* Remote TCP/IP forward requests. */
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int num_remote_forwards;
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struct Forward *remote_forwards;
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int clear_forwardings;
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/* Restrict remote dynamic forwarding */
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char **permitted_remote_opens;
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u_int num_permitted_remote_opens;
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/* stdio forwarding (-W) host and port */
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char *stdio_forward_host;
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int stdio_forward_port;
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int enable_ssh_keysign;
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int64_t rekey_limit;
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int rekey_interval;
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int no_host_authentication_for_localhost;
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int identities_only;
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int server_alive_interval;
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int server_alive_count_max;
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u_int num_send_env;
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char **send_env;
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u_int num_setenv;
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char **setenv;
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char *control_path;
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int control_master;
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int control_persist; /* ControlPersist flag */
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int control_persist_timeout; /* ControlPersist timeout (seconds) */
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int hash_known_hosts;
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int tun_open; /* tun(4) */
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int tun_local; /* force tun device (optional) */
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int tun_remote; /* force tun device (optional) */
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char *local_command;
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int permit_local_command;
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char *remote_command;
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int visual_host_key;
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int request_tty;
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int session_type;
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int stdin_null;
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int fork_after_authentication;
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int proxy_use_fdpass;
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int num_canonical_domains;
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char **canonical_domains;
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int canonicalize_hostname;
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int canonicalize_max_dots;
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int canonicalize_fallback_local;
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int num_permitted_cnames;
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struct allowed_cname *permitted_cnames;
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u_int num_revoked_host_keys;
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char **revoked_host_keys;
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int fingerprint_hash;
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int update_hostkeys; /* one of SSH_UPDATE_HOSTKEYS_* */
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char *hostbased_accepted_algos;
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char *pubkey_accepted_algos;
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char *jump_user;
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char *jump_host;
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int jump_port;
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char *jump_extra;
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char *known_hosts_command;
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int required_rsa_size; /* minimum size of RSA keys */
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int enable_escape_commandline; /* ~C commandline */
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int obscure_keystroke_timing_interval;
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int warn_weak_crypto;
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char **channel_timeouts; /* inactivity timeout by channel type */
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u_int num_channel_timeouts;
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char *version_addendum;
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char *ignored_unknown; /* Pattern list of unknown tokens to ignore */
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} Options;
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#define SSH_PUBKEY_AUTH_NO 0x00
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#define SSH_PUBKEY_AUTH_UNBOUND 0x01
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#define SSH_PUBKEY_AUTH_HBOUND 0x02
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#define SSH_PUBKEY_AUTH_ALL 0x03
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#define SSH_CANONICALISE_NO 0
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#define SSH_CANONICALISE_YES 1
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#define SSH_CANONICALISE_ALWAYS 2
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#define SSHCTL_MASTER_NO 0
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#define SSHCTL_MASTER_YES 1
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#define SSHCTL_MASTER_AUTO 2
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#define SSHCTL_MASTER_ASK 3
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#define SSHCTL_MASTER_AUTO_ASK 4
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#define REQUEST_TTY_AUTO 0
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#define REQUEST_TTY_NO 1
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#define REQUEST_TTY_YES 2
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#define REQUEST_TTY_FORCE 3
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#define SESSION_TYPE_NONE 0
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#define SESSION_TYPE_SUBSYSTEM 1
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#define SESSION_TYPE_DEFAULT 2
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#define SSHCONF_CHECKPERM 1 /* check permissions on config file */
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#define SSHCONF_USERCONF 2 /* user provided config file not system */
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#define SSHCONF_FINAL 4 /* Final pass over config, after canon. */
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#define SSHCONF_NEVERMATCH 8 /* Match/Host never matches; internal only */
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#define SSH_UPDATE_HOSTKEYS_NO 0
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#define SSH_UPDATE_HOSTKEYS_YES 1
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#define SSH_UPDATE_HOSTKEYS_ASK 2
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#define SSH_STRICT_HOSTKEY_OFF 0
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#define SSH_STRICT_HOSTKEY_NEW 1
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#define SSH_STRICT_HOSTKEY_YES 2
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#define SSH_STRICT_HOSTKEY_ASK 3
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/* ObscureKeystrokes parameters */
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#define SSH_KEYSTROKE_DEFAULT_INTERVAL_MS 20
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#define SSH_KEYSTROKE_CHAFF_MIN_MS 1024
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#define SSH_KEYSTROKE_CHAFF_RNG_MS 2048
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const char *kex_default_pk_alg(void);
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char *ssh_connection_hash(const char *thishost, const char *host,
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const char *portstr, const char *user, const char *jump_host);
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void initialize_options(Options *);
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int fill_default_options(Options *);
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void fill_default_options_for_canonicalization(Options *);
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void free_options(Options *o);
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int process_config_line(Options *, struct passwd *, const char *,
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const char *, const char *, char *, const char *, int, int *, int);
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int read_config_file(const char *, struct passwd *, const char *,
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const char *, const char *, Options *, int, int *);
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int parse_forward(struct Forward *, const char *, int, int);
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int ssh_valid_hostname(const char *);
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int ssh_valid_ruser(const char *);
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int parse_jump(const char *, Options *, int, int);
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int parse_ssh_uri(const char *, char **, char **, int *);
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int default_ssh_port(void);
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int option_clear_or_none(const char *);
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int config_has_permitted_cnames(Options *);
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void dump_client_config(Options *o, const char *host);
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void add_local_forward(Options *, const struct Forward *);
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void add_remote_forward(Options *, const struct Forward *);
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void add_identity_file(Options *, const char *, const char *, int);
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void add_certificate_file(Options *, const char *, int);
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#endif /* READCONF_H */
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