crypto/openssh/readconf.h

   1 /* $OpenBSD: readconf.h,v 1.123 2017/09/03 23:33:13 djm Exp $ */
   2
   3 /*
   4  * Author: Tatu Ylonen <ylo@cs.hut.fi>
   5  * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
   6  *                    All rights reserved
   7  * Functions for reading the configuration file.
   8  *
   9  * As far as I am concerned, the code I have written for this software
  10  * can be used freely for any purpose.  Any derived versions of this
  11  * software must be clearly marked as such, and if the derived work is
  12  * incompatible with the protocol description in the RFC file, it must be
  13  * called by a name other than "ssh" or "Secure Shell".
  14  */
  15
  16 #ifndef READCONF_H
  17 #define READCONF_H
  18
  19 /* Data structure for representing option data. */
  20
  21 #define MAX_SEND_ENV            256
  22 #define SSH_MAX_HOSTS_FILES     32
  23 #define MAX_CANON_DOMAINS       32
  24 #define PATH_MAX_SUN            (sizeof((struct sockaddr_un *)0)->sun_path)
  25
  26 struct allowed_cname {
  27         char *source_list;
  28         char *target_list;
  29 };
  30
  31 typedef struct {
  32         int     forward_agent;  /* Forward authentication agent. */
  33         int     forward_x11;    /* Forward X11 display. */
  34         int     forward_x11_timeout;    /* Expiration for Cookies */
  35         int     forward_x11_trusted;    /* Trust Forward X11 display. */
  36         int     exit_on_forward_failure;        /* Exit if bind(2) fails for -L/-R */
  37         char   *xauth_location; /* Location for xauth program */
  38         struct ForwardOptions fwd_opts; /* forwarding options */
  39         int     use_privileged_port;    /* Don't use privileged port if false. */
  40         int     pubkey_authentication;  /* Try ssh2 pubkey authentication. */
  41         int     hostbased_authentication;       /* ssh2's rhosts_rsa */
  42         int     challenge_response_authentication;
  43                                         /* Try S/Key or TIS, authentication. */
  44         int     gss_authentication;     /* Try GSS authentication */
  45         int     gss_deleg_creds;        /* Delegate GSS credentials */
  46         int     password_authentication;        /* Try password
  47                                                  * authentication. */
  48         int     kbd_interactive_authentication; /* Try keyboard-interactive auth. */
  49         char    *kbd_interactive_devices; /* Keyboard-interactive auth devices. */
  50         int     batch_mode;     /* Batch mode: do not ask for passwords. */
  51         int     check_host_ip;  /* Also keep track of keys for IP address */
  52         int     strict_host_key_checking;       /* Strict host key checking. */
  53         int     compression;    /* Compress packets in both directions. */
  54         int     tcp_keep_alive; /* Set SO_KEEPALIVE. */
  55         int     ip_qos_interactive;     /* IP ToS/DSCP/class for interactive */
  56         int     ip_qos_bulk;            /* IP ToS/DSCP/class for bulk traffic */
  57         SyslogFacility log_facility;    /* Facility for system logging. */
  58         LogLevel log_level;     /* Level for logging. */
  59
  60         int     port;           /* Port to connect. */
  61         int     address_family;
  62         int     connection_attempts;    /* Max attempts (seconds) before
  63                                          * giving up */
  64         int     connection_timeout;     /* Max time (seconds) before
  65                                          * aborting connection attempt */
  66         int     number_of_password_prompts;     /* Max number of password
  67                                                  * prompts. */
  68         char   *ciphers;        /* SSH2 ciphers in order of preference. */
  69         char   *macs;           /* SSH2 macs in order of preference. */
  70         char   *hostkeyalgorithms;      /* SSH2 server key types in order of preference. */
  71         char   *kex_algorithms; /* SSH2 kex methods in order of preference. */
  72         char   *hostname;       /* Real host to connect. */
  73         char   *host_key_alias; /* hostname alias for .ssh/known_hosts */
  74         char   *proxy_command;  /* Proxy command for connecting the host. */
  75         char   *user;           /* User to log in as. */
  76         int     escape_char;    /* Escape character; -2 = none */
  77
  78         u_int   num_system_hostfiles;   /* Paths for /etc/ssh/ssh_known_hosts */
  79         char   *system_hostfiles[SSH_MAX_HOSTS_FILES];
  80         u_int   num_user_hostfiles;     /* Path for $HOME/.ssh/known_hosts */
  81         char   *user_hostfiles[SSH_MAX_HOSTS_FILES];
  82         char   *preferred_authentications;
  83         char   *bind_address;   /* local socket address for connection to sshd */
  84         char   *pkcs11_provider; /* PKCS#11 provider */
  85         int     verify_host_key_dns;    /* Verify host key using DNS */
  86
  87         int     num_identity_files;     /* Number of files for RSA/DSA identities. */
  88         char   *identity_files[SSH_MAX_IDENTITY_FILES];
  89         int    identity_file_userprovided[SSH_MAX_IDENTITY_FILES];
  90         struct sshkey *identity_keys[SSH_MAX_IDENTITY_FILES];
  91
  92         int     num_certificate_files; /* Number of extra certificates for ssh. */
  93         char    *certificate_files[SSH_MAX_CERTIFICATE_FILES];
  94         int     certificate_file_userprovided[SSH_MAX_CERTIFICATE_FILES];
  95         struct sshkey *certificates[SSH_MAX_CERTIFICATE_FILES];
  96
  97         int     add_keys_to_agent;
  98         char   *identity_agent;         /* Optional path to ssh-agent socket */
  99
 100         /* Local TCP/IP forward requests. */
 101         int     num_local_forwards;
 102         struct Forward *local_forwards;
 103
 104         /* Remote TCP/IP forward requests. */
 105         int     num_remote_forwards;
 106         struct Forward *remote_forwards;
 107         int     clear_forwardings;
 108
 109         /* stdio forwarding (-W) host and port */
 110         char   *stdio_forward_host;
 111         int     stdio_forward_port;
 112
 113         int     enable_ssh_keysign;
 114         int64_t rekey_limit;
 115         int     rekey_interval;
 116         int     no_host_authentication_for_localhost;
 117         int     identities_only;
 118         int     server_alive_interval;
 119         int     server_alive_count_max;
 120
 121         int     num_send_env;
 122         char   *send_env[MAX_SEND_ENV];
 123
 124         char    *control_path;
 125         int     control_master;
 126         int     control_persist; /* ControlPersist flag */
 127         int     control_persist_timeout; /* ControlPersist timeout (seconds) */
 128
 129         int     hash_known_hosts;
 130
 131         int     tun_open;       /* tun(4) */
 132         int     tun_local;      /* force tun device (optional) */
 133         int     tun_remote;     /* force tun device (optional) */
 134
 135         char    *local_command;
 136         int     permit_local_command;
 137         char    *remote_command;
 138         int     visual_host_key;
 139
 140         int     request_tty;
 141
 142         int     proxy_use_fdpass;
 143
 144         int     num_canonical_domains;
 145         char    *canonical_domains[MAX_CANON_DOMAINS];
 146         int     canonicalize_hostname;
 147         int     canonicalize_max_dots;
 148         int     canonicalize_fallback_local;
 149         int     num_permitted_cnames;
 150         struct allowed_cname permitted_cnames[MAX_CANON_DOMAINS];
 151
 152         char    *revoked_host_keys;
 153
 154         int      fingerprint_hash;
 155
 156         int      update_hostkeys; /* one of SSH_UPDATE_HOSTKEYS_* */
 157
 158         char   *hostbased_key_types;
 159         char   *pubkey_key_types;
 160
 161         char   *jump_user;
 162         char   *jump_host;
 163         int     jump_port;
 164         char   *jump_extra;
 165
 166         char    *ignored_unknown; /* Pattern list of unknown tokens to ignore */
 167 }       Options;
 168
 169 #define SSH_CANONICALISE_NO     0
 170 #define SSH_CANONICALISE_YES    1
 171 #define SSH_CANONICALISE_ALWAYS 2
 172
 173 #define SSHCTL_MASTER_NO        0
 174 #define SSHCTL_MASTER_YES       1
 175 #define SSHCTL_MASTER_AUTO      2
 176 #define SSHCTL_MASTER_ASK       3
 177 #define SSHCTL_MASTER_AUTO_ASK  4
 178
 179 #define REQUEST_TTY_AUTO        0
 180 #define REQUEST_TTY_NO          1
 181 #define REQUEST_TTY_YES         2
 182 #define REQUEST_TTY_FORCE       3
 183
 184 #define SSHCONF_CHECKPERM       1  /* check permissions on config file */
 185 #define SSHCONF_USERCONF        2  /* user provided config file not system */
 186 #define SSHCONF_POSTCANON       4  /* After hostname canonicalisation */
 187 #define SSHCONF_NEVERMATCH      8  /* Match/Host never matches; internal only */
 188
 189 #define SSH_UPDATE_HOSTKEYS_NO  0
 190 #define SSH_UPDATE_HOSTKEYS_YES 1
 191 #define SSH_UPDATE_HOSTKEYS_ASK 2
 192
 193 #define SSH_STRICT_HOSTKEY_OFF  0
 194 #define SSH_STRICT_HOSTKEY_NEW  1
 195 #define SSH_STRICT_HOSTKEY_YES  2
 196 #define SSH_STRICT_HOSTKEY_ASK  3
 197
 198 void     initialize_options(Options *);
 199 void     fill_default_options(Options *);
 200 void     fill_default_options_for_canonicalization(Options *);
 201 int      process_config_line(Options *, struct passwd *, const char *,
 202     const char *, char *, const char *, int, int *, int);
 203 int      read_config_file(const char *, struct passwd *, const char *,
 204     const char *, Options *, int);
 205 int      parse_forward(struct Forward *, const char *, int, int);
 206 int      parse_jump(const char *, Options *, int);
 207 int      default_ssh_port(void);
 208 int      option_clear_or_none(const char *);
 209 void     dump_client_config(Options *o, const char *host);
 210
 211 void     add_local_forward(Options *, const struct Forward *);
 212 void     add_remote_forward(Options *, const struct Forward *);
 213 void     add_identity_file(Options *, const char *, const char *, int);
 214 void     add_certificate_file(Options *, const char *, int);
 215
 216 #endif                          /* READCONF_H */