/* $NetBSD: readconf.h,v 1.22.2.1 2023/12/25 12:31:05 martin Exp $ */ /* $OpenBSD: readconf.h,v 1.154 2023/10/12 02:18:18 djm Exp $ */ /* * Author: Tatu Ylonen * Copyright (c) 1995 Tatu Ylonen , 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 MAX_CANON_DOMAINS 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 */ #if defined(KRB4) || defined(KRB5) int kerberos_authentication; /* Try Kerberos authentication. */ #endif #if defined(AFS) || defined(KRB5) int kerberos_tgt_passing; /* Try Kerberos TGT passing. */ #endif #ifdef AFS int afs_token_passing; /* Try AFS token passing. */ #endif /* Try S/Key or TIS, authentication. */ 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 */ int tcp_rcv_buf; /* user switch to set tcp recv buffer */ int tcp_rcv_buf_poll; /* Option to poll recv buf every window transfer */ int hpn_disabled; /* Switch to disable HPN buffer management */ int hpn_buffer_size; /* User definable size for HPN buffer window */ 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 */ int ipv6_prefer_temporary; /* Prefer temporary IPv6 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 RSA/DSA 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 none_switch; /* Use none cipher */ int none_enabled; /* Allow none to be used */ 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 send_version_first; int session_type; int stdin_null; int fork_after_authentication; int proxy_use_fdpass; int num_canonical_domains; char *canonical_domains[MAX_CANON_DOMAINS]; int canonicalize_hostname; int canonicalize_max_dots; int canonicalize_fallback_local; int num_permitted_cnames; struct allowed_cname permitted_cnames[MAX_CANON_DOMAINS]; 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 */