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258 lines
9.0 KiB
C
258 lines
9.0 KiB
C
/* $OpenBSD: readconf.h,v 1.157 2024/09/25 23:01:39 jsg Exp $ */
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/*
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* Author: Tatu Ylonen <ylo@cs.hut.fi>
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* Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, 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; /* IP ToS/DSCP/class for interactive */
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int ip_qos_bulk; /* IP ToS/DSCP/class 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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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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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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char **channel_timeouts; /* inactivity timeout by channel type */
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u_int num_channel_timeouts;
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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 *, 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 *, Options *, int, int *);
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int parse_forward(struct Forward *, const char *, int, int);
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int parse_jump(const char *, Options *, 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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