1 /* $OpenBSD: servconf.h,v 1.107 2013/01/03 05:49:36 djm Exp $ */
5 * Author: Tatu Ylonen <ylo@cs.hut.fi>
6 * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
8 * Definitions for server configuration data and for the functions reading it.
10 * As far as I am concerned, the code I have written for this software
11 * can be used freely for any purpose. Any derived versions of this
12 * software must be clearly marked as such, and if the derived work is
13 * incompatible with the protocol description in the RFC file, it must be
14 * called by a name other than "ssh" or "Secure Shell".
20 #define MAX_PORTS 256 /* Max # ports. */
22 #define MAX_ALLOW_USERS 256 /* Max # users on allow list. */
23 #define MAX_DENY_USERS 256 /* Max # users on deny list. */
24 #define MAX_ALLOW_GROUPS 256 /* Max # groups on allow list. */
25 #define MAX_DENY_GROUPS 256 /* Max # groups on deny list. */
26 #define MAX_SUBSYSTEMS 256 /* Max # subsystems. */
27 #define MAX_HOSTKEYS 256 /* Max # hostkeys. */
28 #define MAX_HOSTCERTS 256 /* Max # host certificates. */
29 #define MAX_ACCEPT_ENV 256 /* Max # of env vars. */
30 #define MAX_MATCH_GROUPS 256 /* Max # of groups for Match. */
31 #define MAX_AUTHKEYS_FILES 256 /* Max # of authorized_keys files. */
32 #define MAX_AUTH_METHODS 256 /* Max # of AuthenticationMethods. */
34 /* permit_root_login */
35 #define PERMIT_NOT_SET -1
37 #define PERMIT_FORCED_ONLY 1
38 #define PERMIT_NO_PASSWD 2
44 #define PRIVSEP_NOSANDBOX 2
46 /* AllowTCPForwarding */
47 #define FORWARD_DENY 0
48 #define FORWARD_REMOTE (1)
49 #define FORWARD_LOCAL (1<<1)
50 #define FORWARD_ALLOW (FORWARD_REMOTE|FORWARD_LOCAL)
52 #define DEFAULT_AUTH_FAIL_MAX 6 /* Default for MaxAuthTries */
53 #define DEFAULT_SESSIONS_MAX 10 /* Default for MaxSessions */
55 /* Magic name for internal sftp-server */
56 #define INTERNAL_SFTP_NAME "internal-sftp"
60 u_int ports_from_cmdline;
61 int ports[MAX_PORTS]; /* Port number to listen on. */
62 char *listen_addr; /* Address on which the server listens. */
63 struct addrinfo *listen_addrs; /* Addresses on which the server listens. */
64 int address_family; /* Address family used by the server. */
65 char *host_key_files[MAX_HOSTKEYS]; /* Files containing host keys. */
66 int num_host_key_files; /* Number of files for host keys. */
67 char *host_cert_files[MAX_HOSTCERTS]; /* Files containing host certs. */
68 int num_host_cert_files; /* Number of files for host certs. */
69 char *pid_file; /* Where to put our pid */
70 int server_key_bits;/* Size of the server key. */
71 int login_grace_time; /* Disconnect if no auth in this time
73 int key_regeneration_time; /* Server key lifetime (seconds). */
74 int permit_root_login; /* PERMIT_*, see above */
75 int ignore_rhosts; /* Ignore .rhosts and .shosts. */
76 int ignore_user_known_hosts; /* Ignore ~/.ssh/known_hosts
77 * for RhostsRsaAuth */
78 int print_motd; /* If true, print /etc/motd. */
79 int print_lastlog; /* If true, print lastlog */
80 int x11_forwarding; /* If true, permit inet (spoofing) X11 fwd. */
81 int x11_display_offset; /* What DISPLAY number to start
83 int x11_use_localhost; /* If true, use localhost for fake X11 server. */
84 char *xauth_location; /* Location of xauth program */
85 int strict_modes; /* If true, require string home dir modes. */
86 int tcp_keep_alive; /* If true, set SO_KEEPALIVE. */
87 int ip_qos_interactive; /* IP ToS/DSCP/class for interactive */
88 int ip_qos_bulk; /* IP ToS/DSCP/class for bulk traffic */
89 char *ciphers; /* Supported SSH2 ciphers. */
90 char *macs; /* Supported SSH2 macs. */
91 char *kex_algorithms; /* SSH2 kex methods in order of preference. */
92 int protocol; /* Supported protocol versions. */
93 int gateway_ports; /* If true, allow remote connects to forwarded ports. */
94 SyslogFacility log_facility; /* Facility for system logging. */
95 LogLevel log_level; /* Level for system logging. */
96 int rhosts_rsa_authentication; /* If true, permit rhosts RSA
98 int hostbased_authentication; /* If true, permit ssh2 hostbased auth */
99 int hostbased_uses_name_from_packet_only; /* experimental */
100 int rsa_authentication; /* If true, permit RSA authentication. */
101 int pubkey_authentication; /* If true, permit ssh2 pubkey authentication. */
102 int kerberos_authentication; /* If true, permit Kerberos
104 int kerberos_or_local_passwd; /* If true, permit kerberos
105 * and any other password
106 * authentication mechanism,
109 int kerberos_ticket_cleanup; /* If true, destroy ticket
111 int kerberos_get_afs_token; /* If true, try to get AFS token if
112 * authenticated with Kerberos. */
113 int gss_authentication; /* If true, permit GSSAPI authentication */
114 int gss_cleanup_creds; /* If true, destroy cred cache on logout */
115 int password_authentication; /* If true, permit password
117 int kbd_interactive_authentication; /* If true, permit */
118 int challenge_response_authentication;
119 int zero_knowledge_password_authentication;
120 /* If true, permit jpake auth */
121 int permit_empty_passwd; /* If false, do not permit empty
123 int permit_user_env; /* If true, read ~/.ssh/environment */
124 int use_login; /* If true, login(1) is used */
125 int compression; /* If true, compression is allowed */
126 int allow_tcp_forwarding; /* One of FORWARD_* */
127 int allow_agent_forwarding;
128 u_int num_allow_users;
129 char *allow_users[MAX_ALLOW_USERS];
130 u_int num_deny_users;
131 char *deny_users[MAX_DENY_USERS];
132 u_int num_allow_groups;
133 char *allow_groups[MAX_ALLOW_GROUPS];
134 u_int num_deny_groups;
135 char *deny_groups[MAX_DENY_GROUPS];
137 u_int num_subsystems;
138 char *subsystem_name[MAX_SUBSYSTEMS];
139 char *subsystem_command[MAX_SUBSYSTEMS];
140 char *subsystem_args[MAX_SUBSYSTEMS];
142 u_int num_accept_env;
143 char *accept_env[MAX_ACCEPT_ENV];
145 int max_startups_begin;
146 int max_startups_rate;
150 char *banner; /* SSH-2 banner message */
152 int client_alive_interval; /*
153 * poke the client this often to
154 * see if it's still there
156 int client_alive_count_max; /*
157 * If the client is unresponsive
158 * for this many intervals above,
159 * disconnect the session
162 u_int num_authkeys_files; /* Files containing public keys */
163 char *authorized_keys_files[MAX_AUTHKEYS_FILES];
165 char *adm_forced_command;
167 int use_pam; /* Enable auth via PAM */
171 int num_permitted_opens;
173 char *chroot_directory;
174 char *revoked_keys_file;
175 char *trusted_user_ca_keys;
176 char *authorized_principals_file;
177 char *authorized_keys_command;
178 char *authorized_keys_command_user;
180 char *version_addendum; /* Appended to SSH banner */
182 int hpn_disabled; /* Disable HPN functionality. */
183 int hpn_buffer_size; /* Set HPN buffer size - default 2MB.*/
184 int tcp_rcv_buf_poll; /* Poll TCP rcv window in autotuning
186 u_int num_auth_methods;
187 char *auth_methods[MAX_AUTH_METHODS];
189 #ifdef NONE_CIPHER_ENABLED
190 int none_enabled; /* Enable NONE cipher switch. */
194 /* Information about the incoming connection as used by Match */
195 struct connection_info {
197 const char *host; /* possibly resolved hostname */
198 const char *address; /* remote address */
199 const char *laddress; /* local address */
200 int lport; /* local port */
205 * These are string config options that must be copied between the
206 * Match sub-config and the main config, and must be sent from the
207 * privsep slave to the privsep master. We use a macro to ensure all
208 * the options are copied and the copies are done in the correct order.
210 #define COPY_MATCH_STRING_OPTS() do { \
211 M_CP_STROPT(banner); \
212 M_CP_STROPT(trusted_user_ca_keys); \
213 M_CP_STROPT(revoked_keys_file); \
214 M_CP_STROPT(authorized_principals_file); \
215 M_CP_STROPT(authorized_keys_command); \
216 M_CP_STROPT(authorized_keys_command_user); \
217 M_CP_STRARRAYOPT(authorized_keys_files, num_authkeys_files); \
218 M_CP_STRARRAYOPT(allow_users, num_allow_users); \
219 M_CP_STRARRAYOPT(deny_users, num_deny_users); \
220 M_CP_STRARRAYOPT(allow_groups, num_allow_groups); \
221 M_CP_STRARRAYOPT(deny_groups, num_deny_groups); \
222 M_CP_STRARRAYOPT(accept_env, num_accept_env); \
223 M_CP_STRARRAYOPT(auth_methods, num_auth_methods); \
226 struct connection_info *get_connection_info(int, int);
227 void initialize_server_options(ServerOptions *);
228 void fill_default_server_options(ServerOptions *);
229 int process_server_config_line(ServerOptions *, char *, const char *, int,
230 int *, struct connection_info *);
231 void load_server_config(const char *, Buffer *);
232 void parse_server_config(ServerOptions *, const char *, Buffer *,
233 struct connection_info *);
234 void parse_server_match_config(ServerOptions *, struct connection_info *);
235 int parse_server_match_testspec(struct connection_info *, char *);
236 int server_match_spec_complete(struct connection_info *);
237 void copy_set_server_options(ServerOptions *, ServerOptions *, int);
238 void dump_config(ServerOptions *);
239 char *derelativise_path(const char *);
241 #endif /* SERVCONF_H */