crypto/openssh/packet.h

   1 /* $OpenBSD: packet.h,v 1.82 2017/09/12 06:32:07 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  * Interface for the packet protocol functions.
   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 PACKET_H
  17 #define PACKET_H
  18
  19 #include <termios.h>
  20
  21 #ifdef WITH_OPENSSL
  22 # include <openssl/bn.h>
  23 # ifdef OPENSSL_HAS_ECC
  24 #  include <openssl/ec.h>
  25 # else /* OPENSSL_HAS_ECC */
  26 #  define EC_KEY        void
  27 #  define EC_GROUP      void
  28 #  define EC_POINT      void
  29 # endif /* OPENSSL_HAS_ECC */
  30 #else /* WITH_OPENSSL */
  31 # define BIGNUM         void
  32 # define EC_KEY         void
  33 # define EC_GROUP       void
  34 # define EC_POINT       void
  35 #endif /* WITH_OPENSSL */
  36
  37 #include <signal.h>
  38 #include "openbsd-compat/sys-queue.h"
  39
  40 struct kex;
  41 struct sshkey;
  42 struct sshbuf;
  43 struct session_state;   /* private session data */
  44
  45 #include "dispatch.h"   /* typedef, DISPATCH_MAX */
  46
  47 struct key_entry {
  48         TAILQ_ENTRY(key_entry) next;
  49         struct sshkey *key;
  50 };
  51
  52 struct ssh {
  53         /* Session state */
  54         struct session_state *state;
  55
  56         /* Key exchange */
  57         struct kex *kex;
  58
  59         /* cached local and remote ip addresses and ports */
  60         char *remote_ipaddr;
  61         int remote_port;
  62         char *local_ipaddr;
  63         int local_port;
  64
  65         /* Optional preamble for log messages (e.g. username) */
  66         char *log_preamble;
  67
  68         /* Dispatcher table */
  69         dispatch_fn *dispatch[DISPATCH_MAX];
  70         /* number of packets to ignore in the dispatcher */
  71         int dispatch_skip_packets;
  72
  73         /* datafellows */
  74         int compat;
  75
  76         /* Lists for private and public keys */
  77         TAILQ_HEAD(, key_entry) private_keys;
  78         TAILQ_HEAD(, key_entry) public_keys;
  79
  80         /* Client/Server authentication context */
  81         void *authctxt;
  82
  83         /* Channels context */
  84         struct ssh_channels *chanctxt;
  85
  86         /* APP data */
  87         void *app_data;
  88 };
  89
  90 typedef int (ssh_packet_hook_fn)(struct ssh *, struct sshbuf *,
  91     u_char *, void *);
  92
  93 struct ssh *ssh_alloc_session_state(void);
  94 struct ssh *ssh_packet_set_connection(struct ssh *, int, int);
  95 void     ssh_packet_set_timeout(struct ssh *, int, int);
  96 int      ssh_packet_stop_discard(struct ssh *);
  97 int      ssh_packet_connection_af(struct ssh *);
  98 void     ssh_packet_set_nonblocking(struct ssh *);
  99 int      ssh_packet_get_connection_in(struct ssh *);
 100 int      ssh_packet_get_connection_out(struct ssh *);
 101 void     ssh_packet_close(struct ssh *);
 102 void     ssh_packet_set_input_hook(struct ssh *, ssh_packet_hook_fn *, void *);
 103 void     ssh_packet_clear_keys(struct ssh *);
 104 void     ssh_clear_newkeys(struct ssh *, int);
 105
 106 int      ssh_packet_is_rekeying(struct ssh *);
 107 void     ssh_packet_set_protocol_flags(struct ssh *, u_int);
 108 u_int    ssh_packet_get_protocol_flags(struct ssh *);
 109 int      ssh_packet_start_compression(struct ssh *, int);
 110 void     ssh_packet_set_tos(struct ssh *, int);
 111 void     ssh_packet_set_interactive(struct ssh *, int, int, int);
 112 int      ssh_packet_is_interactive(struct ssh *);
 113 void     ssh_packet_set_server(struct ssh *);
 114 void     ssh_packet_set_authenticated(struct ssh *);
 115 void     ssh_packet_set_mux(struct ssh *);
 116 int      ssh_packet_get_mux(struct ssh *);
 117 int      ssh_packet_set_log_preamble(struct ssh *, const char *, ...)
 118     __attribute__((format(printf, 2, 3)));
 119
 120 int      ssh_packet_log_type(u_char);
 121
 122 int      ssh_packet_send2_wrapped(struct ssh *);
 123 int      ssh_packet_send2(struct ssh *);
 124
 125 int      ssh_packet_read(struct ssh *);
 126 int      ssh_packet_read_expect(struct ssh *, u_int type);
 127 int      ssh_packet_read_poll(struct ssh *);
 128 int ssh_packet_read_poll2(struct ssh *, u_char *, u_int32_t *seqnr_p);
 129 int      ssh_packet_process_incoming(struct ssh *, const char *buf, u_int len);
 130 int      ssh_packet_read_seqnr(struct ssh *, u_char *, u_int32_t *seqnr_p);
 131 int      ssh_packet_read_poll_seqnr(struct ssh *, u_char *, u_int32_t *seqnr_p);
 132
 133 const void *ssh_packet_get_string_ptr(struct ssh *, u_int *length_ptr);
 134 void     ssh_packet_disconnect(struct ssh *, const char *fmt, ...)
 135         __attribute__((format(printf, 2, 3)))
 136         __attribute__((noreturn));
 137 void     ssh_packet_send_debug(struct ssh *, const char *fmt, ...) __attribute__((format(printf, 2, 3)));
 138
 139 int      ssh_set_newkeys(struct ssh *, int mode);
 140 void     ssh_packet_get_bytes(struct ssh *, u_int64_t *, u_int64_t *);
 141
 142 int      ssh_packet_write_poll(struct ssh *);
 143 int      ssh_packet_write_wait(struct ssh *);
 144 int      ssh_packet_have_data_to_write(struct ssh *);
 145 int      ssh_packet_not_very_much_data_to_write(struct ssh *);
 146
 147 int      ssh_packet_connection_is_on_socket(struct ssh *);
 148 int      ssh_packet_remaining(struct ssh *);
 149
 150 void     tty_make_modes(int, struct termios *);
 151 void     tty_parse_modes(int, int *);
 152
 153 void     ssh_packet_set_alive_timeouts(struct ssh *, int);
 154 int      ssh_packet_inc_alive_timeouts(struct ssh *);
 155 int      ssh_packet_set_maxsize(struct ssh *, u_int);
 156 u_int    ssh_packet_get_maxsize(struct ssh *);
 157
 158 int      ssh_packet_get_state(struct ssh *, struct sshbuf *);
 159 int      ssh_packet_set_state(struct ssh *, struct sshbuf *);
 160
 161 const char *ssh_remote_ipaddr(struct ssh *);
 162 int      ssh_remote_port(struct ssh *);
 163 const char *ssh_local_ipaddr(struct ssh *);
 164 int      ssh_local_port(struct ssh *);
 165
 166 void     ssh_packet_set_rekey_limits(struct ssh *, u_int64_t, u_int32_t);
 167 time_t   ssh_packet_get_rekey_timeout(struct ssh *);
 168
 169 void    *ssh_packet_get_input(struct ssh *);
 170 void    *ssh_packet_get_output(struct ssh *);
 171
 172 /* new API */
 173 int     sshpkt_start(struct ssh *ssh, u_char type);
 174 int     sshpkt_send(struct ssh *ssh);
 175 int     sshpkt_disconnect(struct ssh *, const char *fmt, ...)
 176             __attribute__((format(printf, 2, 3)));
 177 int     sshpkt_add_padding(struct ssh *, u_char);
 178 void    sshpkt_fatal(struct ssh *ssh, const char *tag, int r);
 179 int     sshpkt_msg_ignore(struct ssh *, u_int);
 180
 181 int     sshpkt_put(struct ssh *ssh, const void *v, size_t len);
 182 int     sshpkt_putb(struct ssh *ssh, const struct sshbuf *b);
 183 int     sshpkt_put_u8(struct ssh *ssh, u_char val);
 184 int     sshpkt_put_u32(struct ssh *ssh, u_int32_t val);
 185 int     sshpkt_put_u64(struct ssh *ssh, u_int64_t val);
 186 int     sshpkt_put_string(struct ssh *ssh, const void *v, size_t len);
 187 int     sshpkt_put_cstring(struct ssh *ssh, const void *v);
 188 int     sshpkt_put_stringb(struct ssh *ssh, const struct sshbuf *v);
 189 int     sshpkt_put_ec(struct ssh *ssh, const EC_POINT *v, const EC_GROUP *g);
 190 int     sshpkt_put_bignum2(struct ssh *ssh, const BIGNUM *v);
 191
 192 int     sshpkt_get(struct ssh *ssh, void *valp, size_t len);
 193 int     sshpkt_get_u8(struct ssh *ssh, u_char *valp);
 194 int     sshpkt_get_u32(struct ssh *ssh, u_int32_t *valp);
 195 int     sshpkt_get_u64(struct ssh *ssh, u_int64_t *valp);
 196 int     sshpkt_get_string(struct ssh *ssh, u_char **valp, size_t *lenp);
 197 int     sshpkt_get_string_direct(struct ssh *ssh, const u_char **valp, size_t *lenp);
 198 int     sshpkt_peek_string_direct(struct ssh *ssh, const u_char **valp, size_t *lenp);
 199 int     sshpkt_get_cstring(struct ssh *ssh, char **valp, size_t *lenp);
 200 int     sshpkt_get_ec(struct ssh *ssh, EC_POINT *v, const EC_GROUP *g);
 201 int     sshpkt_get_bignum2(struct ssh *ssh, BIGNUM *v);
 202 int     sshpkt_get_end(struct ssh *ssh);
 203 const u_char    *sshpkt_ptr(struct ssh *, size_t *lenp);
 204
 205 /* OLD API */
 206 extern struct ssh *active_state;
 207 #include "opacket.h"
 208
 209 #if !defined(WITH_OPENSSL)
 210 # undef BIGNUM
 211 # undef EC_KEY
 212 # undef EC_GROUP
 213 # undef EC_POINT
 214 #elif !defined(OPENSSL_HAS_ECC)
 215 # undef EC_KEY
 216 # undef EC_GROUP
 217 # undef EC_POINT
 218 #endif
 219
 220 #endif                          /* PACKET_H */