crypto/openssh/packet.h

   1 /* $OpenBSD: packet.h,v 1.71 2016/03/07 19:02:43 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         /* Dispatcher table */
  66         dispatch_fn *dispatch[DISPATCH_MAX];
  67         /* number of packets to ignore in the dispatcher */
  68         int dispatch_skip_packets;
  69
  70         /* datafellows */
  71         int compat;
  72
  73         /* Lists for private and public keys */
  74         TAILQ_HEAD(, key_entry) private_keys;
  75         TAILQ_HEAD(, key_entry) public_keys;
  76
  77         /* APP data */
  78         void *app_data;
  79 };
  80
  81 struct ssh *ssh_alloc_session_state(void);
  82 struct ssh *ssh_packet_set_connection(struct ssh *, int, int);
  83 void     ssh_packet_set_timeout(struct ssh *, int, int);
  84 int      ssh_packet_stop_discard(struct ssh *);
  85 int      ssh_packet_connection_af(struct ssh *);
  86 void     ssh_packet_set_nonblocking(struct ssh *);
  87 int      ssh_packet_get_connection_in(struct ssh *);
  88 int      ssh_packet_get_connection_out(struct ssh *);
  89 void     ssh_packet_close(struct ssh *);
  90 void     ssh_packet_set_encryption_key(struct ssh *, const u_char *, u_int, int);
  91 int      ssh_packet_is_rekeying(struct ssh *);
  92 void     ssh_packet_set_protocol_flags(struct ssh *, u_int);
  93 u_int    ssh_packet_get_protocol_flags(struct ssh *);
  94 int      ssh_packet_start_compression(struct ssh *, int);
  95 void     ssh_packet_set_tos(struct ssh *, int);
  96 void     ssh_packet_set_interactive(struct ssh *, int, int, int);
  97 int      ssh_packet_is_interactive(struct ssh *);
  98 void     ssh_packet_set_server(struct ssh *);
  99 void     ssh_packet_set_authenticated(struct ssh *);
 100
 101 int      ssh_packet_send1(struct ssh *);
 102 int      ssh_packet_send2_wrapped(struct ssh *);
 103 int      ssh_packet_send2(struct ssh *);
 104
 105 int      ssh_packet_read(struct ssh *);
 106 int      ssh_packet_read_expect(struct ssh *, u_int type);
 107 int      ssh_packet_read_poll(struct ssh *);
 108 int ssh_packet_read_poll1(struct ssh *, u_char *);
 109 int ssh_packet_read_poll2(struct ssh *, u_char *, u_int32_t *seqnr_p);
 110 int      ssh_packet_process_incoming(struct ssh *, const char *buf, u_int len);
 111 int      ssh_packet_read_seqnr(struct ssh *, u_char *, u_int32_t *seqnr_p);
 112 int      ssh_packet_read_poll_seqnr(struct ssh *, u_char *, u_int32_t *seqnr_p);
 113
 114 const void *ssh_packet_get_string_ptr(struct ssh *, u_int *length_ptr);
 115 void     ssh_packet_disconnect(struct ssh *, const char *fmt, ...)
 116         __attribute__((format(printf, 2, 3)))
 117         __attribute__((noreturn));
 118 void     ssh_packet_send_debug(struct ssh *, const char *fmt, ...) __attribute__((format(printf, 2, 3)));
 119
 120 int      ssh_set_newkeys(struct ssh *, int mode);
 121 void     ssh_packet_get_bytes(struct ssh *, u_int64_t *, u_int64_t *);
 122
 123 typedef void *(ssh_packet_comp_alloc_func)(void *, u_int, u_int);
 124 typedef void (ssh_packet_comp_free_func)(void *, void *);
 125 void     ssh_packet_set_compress_hooks(struct ssh *, void *,
 126     ssh_packet_comp_alloc_func *, ssh_packet_comp_free_func *);
 127
 128 int      ssh_packet_write_poll(struct ssh *);
 129 int      ssh_packet_write_wait(struct ssh *);
 130 int      ssh_packet_have_data_to_write(struct ssh *);
 131 int      ssh_packet_not_very_much_data_to_write(struct ssh *);
 132
 133 int      ssh_packet_connection_is_on_socket(struct ssh *);
 134 int      ssh_packet_remaining(struct ssh *);
 135 void     ssh_packet_send_ignore(struct ssh *, int);
 136
 137 void     tty_make_modes(int, struct termios *);
 138 void     tty_parse_modes(int, int *);
 139
 140 void     ssh_packet_set_alive_timeouts(struct ssh *, int);
 141 int      ssh_packet_inc_alive_timeouts(struct ssh *);
 142 int      ssh_packet_set_maxsize(struct ssh *, u_int);
 143 u_int    ssh_packet_get_maxsize(struct ssh *);
 144
 145 int      ssh_packet_get_state(struct ssh *, struct sshbuf *);
 146 int      ssh_packet_set_state(struct ssh *, struct sshbuf *);
 147
 148 const char *ssh_remote_ipaddr(struct ssh *);
 149 int      ssh_remote_port(struct ssh *);
 150 const char *ssh_local_ipaddr(struct ssh *);
 151 int      ssh_local_port(struct ssh *);
 152
 153 void     ssh_packet_set_rekey_limits(struct ssh *, u_int64_t, time_t);
 154 time_t   ssh_packet_get_rekey_timeout(struct ssh *);
 155
 156 void    *ssh_packet_get_input(struct ssh *);
 157 void    *ssh_packet_get_output(struct ssh *);
 158
 159 /* new API */
 160 int     sshpkt_start(struct ssh *ssh, u_char type);
 161 int     sshpkt_send(struct ssh *ssh);
 162 int     sshpkt_disconnect(struct ssh *, const char *fmt, ...)
 163             __attribute__((format(printf, 2, 3)));
 164 int     sshpkt_add_padding(struct ssh *, u_char);
 165 void    sshpkt_fatal(struct ssh *ssh, const char *tag, int r);
 166
 167 int     sshpkt_put(struct ssh *ssh, const void *v, size_t len);
 168 int     sshpkt_putb(struct ssh *ssh, const struct sshbuf *b);
 169 int     sshpkt_put_u8(struct ssh *ssh, u_char val);
 170 int     sshpkt_put_u32(struct ssh *ssh, u_int32_t val);
 171 int     sshpkt_put_u64(struct ssh *ssh, u_int64_t val);
 172 int     sshpkt_put_string(struct ssh *ssh, const void *v, size_t len);
 173 int     sshpkt_put_cstring(struct ssh *ssh, const void *v);
 174 int     sshpkt_put_stringb(struct ssh *ssh, const struct sshbuf *v);
 175 int     sshpkt_put_ec(struct ssh *ssh, const EC_POINT *v, const EC_GROUP *g);
 176 int     sshpkt_put_bignum1(struct ssh *ssh, const BIGNUM *v);
 177 int     sshpkt_put_bignum2(struct ssh *ssh, const BIGNUM *v);
 178
 179 int     sshpkt_get(struct ssh *ssh, void *valp, size_t len);
 180 int     sshpkt_get_u8(struct ssh *ssh, u_char *valp);
 181 int     sshpkt_get_u32(struct ssh *ssh, u_int32_t *valp);
 182 int     sshpkt_get_u64(struct ssh *ssh, u_int64_t *valp);
 183 int     sshpkt_get_string(struct ssh *ssh, u_char **valp, size_t *lenp);
 184 int     sshpkt_get_string_direct(struct ssh *ssh, const u_char **valp, size_t *lenp);
 185 int     sshpkt_get_cstring(struct ssh *ssh, char **valp, size_t *lenp);
 186 int     sshpkt_get_ec(struct ssh *ssh, EC_POINT *v, const EC_GROUP *g);
 187 int     sshpkt_get_bignum1(struct ssh *ssh, BIGNUM *v);
 188 int     sshpkt_get_bignum2(struct ssh *ssh, BIGNUM *v);
 189 int     sshpkt_get_end(struct ssh *ssh);
 190 const u_char    *sshpkt_ptr(struct ssh *, size_t *lenp);
 191
 192 /* OLD API */
 193 extern struct ssh *active_state;
 194 #include "opacket.h"
 195
 196 #if !defined(WITH_OPENSSL)
 197 # undef BIGNUM
 198 # undef EC_KEY
 199 # undef EC_GROUP
 200 # undef EC_POINT
 201 #elif !defined(OPENSSL_HAS_ECC)
 202 # undef EC_KEY
 203 # undef EC_GROUP
 204 # undef EC_POINT
 205 #endif
 206
 207 #endif                          /* PACKET_H */