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/* $OpenBSD: readconf.h,v 1.157 2024/09/25 23:01:39 jsg Exp $ */
/*
* Author: Tatu Ylonen <ylo@cs.hut.fi>
* Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
* All rights reserved
* Functions for reading the configuration file.
*
* 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".
*/
#ifndef READCONF_H
#define READCONF_H
/* Data structure for representing option data. */
#define SSH_MAX_HOSTS_FILES 32
#define PATH_MAX_SUN (sizeof((struct sockaddr_un *)0)->sun_path)
struct allowed_cname {
char *source_list;
char *target_list;
};
typedef struct {
char *host_arg; /* Host arg as specified on command line. */
int forward_agent; /* Forward authentication agent. */
char *forward_agent_sock_path; /* Optional path of the agent. */
int forward_x11; /* Forward X11 display. */
int forward_x11_timeout; /* Expiration for Cookies */
int forward_x11_trusted; /* Trust Forward X11 display. */
int exit_on_forward_failure; /* Exit if bind(2) fails for -L/-R */
char *xauth_location; /* Location for xauth program */
struct ForwardOptions fwd_opts; /* forwarding options */
int pubkey_authentication; /* Try ssh2 pubkey authentication. */
int hostbased_authentication; /* ssh2's rhosts_rsa */
int gss_authentication; /* Try GSS authentication */
int gss_deleg_creds; /* Delegate GSS credentials */
int password_authentication; /* Try password
* authentication. */
int kbd_interactive_authentication; /* Try keyboard-interactive auth. */
char *kbd_interactive_devices; /* Keyboard-interactive auth devices. */
int batch_mode; /* Batch mode: do not ask for passwords. */
int check_host_ip; /* Also keep track of keys for IP address */
int strict_host_key_checking; /* Strict host key checking. */
int compression; /* Compress packets in both directions. */
int tcp_keep_alive; /* Set SO_KEEPALIVE. */
int ip_qos_interactive; /* IP ToS/DSCP/class for interactive */
int ip_qos_bulk; /* IP ToS/DSCP/class for bulk traffic */
SyslogFacility log_facility; /* Facility for system logging. */
LogLevel log_level; /* Level for logging. */
u_int num_log_verbose; /* Verbose log overrides */
char **log_verbose;
int port; /* Port to connect. */
int address_family;
int connection_attempts; /* Max attempts (seconds) before
* giving up */
int connection_timeout; /* Max time (seconds) before
* aborting connection attempt */
int number_of_password_prompts; /* Max number of password
* prompts. */
char *ciphers; /* SSH2 ciphers in order of preference. */
char *macs; /* SSH2 macs in order of preference. */
char *hostkeyalgorithms; /* SSH2 server key types in order of preference. */
char *kex_algorithms; /* SSH2 kex methods in order of preference. */
char *ca_sign_algorithms; /* Allowed CA signature algorithms */
char *hostname; /* Real host to connect. */
char *tag; /* Configuration tag name. */
char *host_key_alias; /* hostname alias for .ssh/known_hosts */
char *proxy_command; /* Proxy command for connecting the host. */
char *user; /* User to log in as. */
int escape_char; /* Escape character; -2 = none */
u_int num_system_hostfiles; /* Paths for /etc/ssh/ssh_known_hosts */
char *system_hostfiles[SSH_MAX_HOSTS_FILES];
u_int num_user_hostfiles; /* Path for $HOME/.ssh/known_hosts */
char *user_hostfiles[SSH_MAX_HOSTS_FILES];
char *preferred_authentications;
char *bind_address; /* local socket address for connection to sshd */
char *bind_interface; /* local interface for bind address */
char *pkcs11_provider; /* PKCS#11 provider */
char *sk_provider; /* Security key provider */
int verify_host_key_dns; /* Verify host key using DNS */
int num_identity_files; /* Number of files for identities. */
char *identity_files[SSH_MAX_IDENTITY_FILES];
int identity_file_userprovided[SSH_MAX_IDENTITY_FILES];
struct sshkey *identity_keys[SSH_MAX_IDENTITY_FILES];
int num_certificate_files; /* Number of extra certificates for ssh. */
char *certificate_files[SSH_MAX_CERTIFICATE_FILES];
int certificate_file_userprovided[SSH_MAX_CERTIFICATE_FILES];
struct sshkey *certificates[SSH_MAX_CERTIFICATE_FILES];
int add_keys_to_agent;
int add_keys_to_agent_lifespan;
char *identity_agent; /* Optional path to ssh-agent socket */
/* Local TCP/IP forward requests. */
int num_local_forwards;
struct Forward *local_forwards;
/* Remote TCP/IP forward requests. */
int num_remote_forwards;
struct Forward *remote_forwards;
int clear_forwardings;
/* Restrict remote dynamic forwarding */
char **permitted_remote_opens;
u_int num_permitted_remote_opens;
/* stdio forwarding (-W) host and port */
char *stdio_forward_host;
int stdio_forward_port;
int enable_ssh_keysign;
int64_t rekey_limit;
int rekey_interval;
int no_host_authentication_for_localhost;
int identities_only;
int server_alive_interval;
int server_alive_count_max;
u_int num_send_env;
char **send_env;
u_int num_setenv;
char **setenv;
char *control_path;
int control_master;
int control_persist; /* ControlPersist flag */
int control_persist_timeout; /* ControlPersist timeout (seconds) */
int hash_known_hosts;
int tun_open; /* tun(4) */
int tun_local; /* force tun device (optional) */
int tun_remote; /* force tun device (optional) */
char *local_command;
int permit_local_command;
char *remote_command;
int visual_host_key;
int request_tty;
int session_type;
int stdin_null;
int fork_after_authentication;
int proxy_use_fdpass;
int num_canonical_domains;
char **canonical_domains;
int canonicalize_hostname;
int canonicalize_max_dots;
int canonicalize_fallback_local;
int num_permitted_cnames;
struct allowed_cname *permitted_cnames;
char *revoked_host_keys;
int fingerprint_hash;
int update_hostkeys; /* one of SSH_UPDATE_HOSTKEYS_* */
char *hostbased_accepted_algos;
char *pubkey_accepted_algos;
char *jump_user;
char *jump_host;
int jump_port;
char *jump_extra;
char *known_hosts_command;
int required_rsa_size; /* minimum size of RSA keys */
int enable_escape_commandline; /* ~C commandline */
int obscure_keystroke_timing_interval;
char **channel_timeouts; /* inactivity timeout by channel type */
u_int num_channel_timeouts;
char *ignored_unknown; /* Pattern list of unknown tokens to ignore */
} Options;
#define SSH_PUBKEY_AUTH_NO 0x00
#define SSH_PUBKEY_AUTH_UNBOUND 0x01
#define SSH_PUBKEY_AUTH_HBOUND 0x02
#define SSH_PUBKEY_AUTH_ALL 0x03
#define SSH_CANONICALISE_NO 0
#define SSH_CANONICALISE_YES 1
#define SSH_CANONICALISE_ALWAYS 2
#define SSHCTL_MASTER_NO 0
#define SSHCTL_MASTER_YES 1
#define SSHCTL_MASTER_AUTO 2
#define SSHCTL_MASTER_ASK 3
#define SSHCTL_MASTER_AUTO_ASK 4
#define REQUEST_TTY_AUTO 0
#define REQUEST_TTY_NO 1
#define REQUEST_TTY_YES 2
#define REQUEST_TTY_FORCE 3
#define SESSION_TYPE_NONE 0
#define SESSION_TYPE_SUBSYSTEM 1
#define SESSION_TYPE_DEFAULT 2
#define SSHCONF_CHECKPERM 1 /* check permissions on config file */
#define SSHCONF_USERCONF 2 /* user provided config file not system */
#define SSHCONF_FINAL 4 /* Final pass over config, after canon. */
#define SSHCONF_NEVERMATCH 8 /* Match/Host never matches; internal only */
#define SSH_UPDATE_HOSTKEYS_NO 0
#define SSH_UPDATE_HOSTKEYS_YES 1
#define SSH_UPDATE_HOSTKEYS_ASK 2
#define SSH_STRICT_HOSTKEY_OFF 0
#define SSH_STRICT_HOSTKEY_NEW 1
#define SSH_STRICT_HOSTKEY_YES 2
#define SSH_STRICT_HOSTKEY_ASK 3
/* ObscureKeystrokes parameters */
#define SSH_KEYSTROKE_DEFAULT_INTERVAL_MS 20
#define SSH_KEYSTROKE_CHAFF_MIN_MS 1024
#define SSH_KEYSTROKE_CHAFF_RNG_MS 2048
const char *kex_default_pk_alg(void);
char *ssh_connection_hash(const char *thishost, const char *host,
const char *portstr, const char *user, const char *jump_host);
void initialize_options(Options *);
int fill_default_options(Options *);
void fill_default_options_for_canonicalization(Options *);
void free_options(Options *o);
int process_config_line(Options *, struct passwd *, const char *,
const char *, char *, const char *, int, int *, int);
int read_config_file(const char *, struct passwd *, const char *,
const char *, Options *, int, int *);
int parse_forward(struct Forward *, const char *, int, int);
int parse_jump(const char *, Options *, int);
int parse_ssh_uri(const char *, char **, char **, int *);
int default_ssh_port(void);
int option_clear_or_none(const char *);
int config_has_permitted_cnames(Options *);
void dump_client_config(Options *o, const char *host);
void add_local_forward(Options *, const struct Forward *);
void add_remote_forward(Options *, const struct Forward *);
void add_identity_file(Options *, const char *, const char *, int);
void add_certificate_file(Options *, const char *, int);
#endif /* READCONF_H */
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