crypto/openssh/readconf.h

   1 /* $OpenBSD: readconf.h,v 1.117 2016/07/15 00:24:30 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     rhosts_rsa_authentication;      /* Try rhosts with RSA
  41                                                  * authentication. */
  42         int     rsa_authentication;     /* Try RSA authentication. */
  43         int     pubkey_authentication;  /* Try ssh2 pubkey authentication. */
  44         int     hostbased_authentication;       /* ssh2's rhosts_rsa */
  45         int     challenge_response_authentication;
  46                                         /* Try S/Key or TIS, authentication. */
  47         int     gss_authentication;     /* Try GSS authentication */
  48         int     gss_deleg_creds;        /* Delegate GSS credentials */
  49         int     password_authentication;        /* Try password
  50                                                  * authentication. */
  51         int     kbd_interactive_authentication; /* Try keyboard-interactive auth. */
  52         char    *kbd_interactive_devices; /* Keyboard-interactive auth devices. */
  53         int     batch_mode;     /* Batch mode: do not ask for passwords. */
  54         int     check_host_ip;  /* Also keep track of keys for IP address */
  55         int     strict_host_key_checking;       /* Strict host key checking. */
  56         int     compression;    /* Compress packets in both directions. */
  57         int     compression_level;      /* Compression level 1 (fast) to 9
  58                                          * (best). */
  59         int     tcp_keep_alive; /* Set SO_KEEPALIVE. */
  60         int     ip_qos_interactive;     /* IP ToS/DSCP/class for interactive */
  61         int     ip_qos_bulk;            /* IP ToS/DSCP/class for bulk traffic */
  62         LogLevel log_level;     /* Level for logging. */
  63
  64         int     port;           /* Port to connect. */
  65         int     address_family;
  66         int     connection_attempts;    /* Max attempts (seconds) before
  67                                          * giving up */
  68         int     connection_timeout;     /* Max time (seconds) before
  69                                          * aborting connection attempt */
  70         int     number_of_password_prompts;     /* Max number of password
  71                                                  * prompts. */
  72         int     cipher;         /* Cipher to use. */
  73         char   *ciphers;        /* SSH2 ciphers in order of preference. */
  74         char   *macs;           /* SSH2 macs in order of preference. */
  75         char   *hostkeyalgorithms;      /* SSH2 server key types in order of preference. */
  76         char   *kex_algorithms; /* SSH2 kex methods in order of preference. */
  77         int     protocol;       /* Protocol in order of preference. */
  78         char   *hostname;       /* Real host to connect. */
  79         char   *host_key_alias; /* hostname alias for .ssh/known_hosts */
  80         char   *proxy_command;  /* Proxy command for connecting the host. */
  81         char   *user;           /* User to log in as. */
  82         int     escape_char;    /* Escape character; -2 = none */
  83
  84         u_int   num_system_hostfiles;   /* Paths for /etc/ssh/ssh_known_hosts */
  85         char   *system_hostfiles[SSH_MAX_HOSTS_FILES];
  86         u_int   num_user_hostfiles;     /* Path for $HOME/.ssh/known_hosts */
  87         char   *user_hostfiles[SSH_MAX_HOSTS_FILES];
  88         char   *preferred_authentications;
  89         char   *bind_address;   /* local socket address for connection to sshd */
  90         char   *pkcs11_provider; /* PKCS#11 provider */
  91         int     verify_host_key_dns;    /* Verify host key using DNS */
  92
  93         int     num_identity_files;     /* Number of files for RSA/DSA identities. */
  94         char   *identity_files[SSH_MAX_IDENTITY_FILES];
  95         int    identity_file_userprovided[SSH_MAX_IDENTITY_FILES];
  96         struct sshkey *identity_keys[SSH_MAX_IDENTITY_FILES];
  97
  98         int     num_certificate_files; /* Number of extra certificates for ssh. */
  99         char    *certificate_files[SSH_MAX_CERTIFICATE_FILES];
 100         int     certificate_file_userprovided[SSH_MAX_CERTIFICATE_FILES];
 101         struct sshkey *certificates[SSH_MAX_CERTIFICATE_FILES];
 102
 103         int     add_keys_to_agent;
 104         char   *identity_agent;         /* Optional path to ssh-agent socket */
 105
 106         /* Local TCP/IP forward requests. */
 107         int     num_local_forwards;
 108         struct Forward *local_forwards;
 109
 110         /* Remote TCP/IP forward requests. */
 111         int     num_remote_forwards;
 112         struct Forward *remote_forwards;
 113         int     clear_forwardings;
 114
 115         /* stdio forwarding (-W) host and port */
 116         char   *stdio_forward_host;
 117         int     stdio_forward_port;
 118
 119         int     enable_ssh_keysign;
 120         int64_t rekey_limit;
 121         int     rekey_interval;
 122         int     no_host_authentication_for_localhost;
 123         int     identities_only;
 124         int     server_alive_interval;
 125         int     server_alive_count_max;
 126
 127         int     num_send_env;
 128         char   *send_env[MAX_SEND_ENV];
 129
 130         char    *control_path;
 131         int     control_master;
 132         int     control_persist; /* ControlPersist flag */
 133         int     control_persist_timeout; /* ControlPersist timeout (seconds) */
 134
 135         int     hash_known_hosts;
 136
 137         int     tun_open;       /* tun(4) */
 138         int     tun_local;      /* force tun device (optional) */
 139         int     tun_remote;     /* force tun device (optional) */
 140
 141         char    *local_command;
 142         int     permit_local_command;
 143         int     visual_host_key;
 144
 145         int     request_tty;
 146
 147         int     proxy_use_fdpass;
 148
 149         int     num_canonical_domains;
 150         char    *canonical_domains[MAX_CANON_DOMAINS];
 151         int     canonicalize_hostname;
 152         int     canonicalize_max_dots;
 153         int     canonicalize_fallback_local;
 154         int     num_permitted_cnames;
 155         struct allowed_cname permitted_cnames[MAX_CANON_DOMAINS];
 156
 157         char    *revoked_host_keys;
 158
 159         int      fingerprint_hash;
 160
 161         int      update_hostkeys; /* one of SSH_UPDATE_HOSTKEYS_* */
 162
 163         char   *hostbased_key_types;
 164         char   *pubkey_key_types;
 165
 166         char   *jump_user;
 167         char   *jump_host;
 168         int     jump_port;
 169         char   *jump_extra;
 170
 171         char    *ignored_unknown; /* Pattern list of unknown tokens to ignore */
 172 }       Options;
 173
 174 #define SSH_CANONICALISE_NO     0
 175 #define SSH_CANONICALISE_YES    1
 176 #define SSH_CANONICALISE_ALWAYS 2
 177
 178 #define SSHCTL_MASTER_NO        0
 179 #define SSHCTL_MASTER_YES       1
 180 #define SSHCTL_MASTER_AUTO      2
 181 #define SSHCTL_MASTER_ASK       3
 182 #define SSHCTL_MASTER_AUTO_ASK  4
 183
 184 #define REQUEST_TTY_AUTO        0
 185 #define REQUEST_TTY_NO          1
 186 #define REQUEST_TTY_YES         2
 187 #define REQUEST_TTY_FORCE       3
 188
 189 #define SSHCONF_CHECKPERM       1  /* check permissions on config file */
 190 #define SSHCONF_USERCONF        2  /* user provided config file not system */
 191 #define SSHCONF_POSTCANON       4  /* After hostname canonicalisation */
 192 #define SSHCONF_NEVERMATCH      8  /* Match/Host never matches; internal only */
 193
 194 #define SSH_UPDATE_HOSTKEYS_NO  0
 195 #define SSH_UPDATE_HOSTKEYS_YES 1
 196 #define SSH_UPDATE_HOSTKEYS_ASK 2
 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 */