1 /* $OpenBSD: packet.h,v 1.99 2024/08/15 00:51:51 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 # include <openssl/evp.h> 24 # ifdef OPENSSL_HAS_ECC 25 # include <openssl/ec.h> 26 # else /* OPENSSL_HAS_ECC */ 27 # define EC_KEY void 28 # define EC_GROUP void 29 # define EC_POINT void 30 # endif /* OPENSSL_HAS_ECC */ 31 #else /* WITH_OPENSSL */ 32 # define BIGNUM void 33 # define EC_KEY void 34 # define EC_GROUP void 35 # define EC_POINT void 36 # define EVP_PKEY void 37 #endif /* WITH_OPENSSL */ 38 39 #include <signal.h> 40 #include "openbsd-compat/sys-queue.h" 41 42 struct kex; 43 struct sshkey; 44 struct sshbuf; 45 struct session_state; /* private session data */ 46 47 #include "dispatch.h" /* typedef, DISPATCH_MAX */ 48 49 struct key_entry { 50 TAILQ_ENTRY(key_entry) next; 51 struct sshkey *key; 52 }; 53 54 struct ssh { 55 /* Session state */ 56 struct session_state *state; 57 58 /* Key exchange */ 59 struct kex *kex; 60 61 /* cached local and remote ip addresses and ports */ 62 char *remote_ipaddr; 63 int remote_port; 64 char *local_ipaddr; 65 int local_port; 66 char *rdomain_in; 67 68 /* Optional preamble for log messages (e.g. username) */ 69 char *log_preamble; 70 71 /* Dispatcher table */ 72 dispatch_fn *dispatch[DISPATCH_MAX]; 73 /* number of packets to ignore in the dispatcher */ 74 int dispatch_skip_packets; 75 76 /* datafellows */ 77 int compat; 78 79 /* Lists for private and public keys */ 80 TAILQ_HEAD(, key_entry) private_keys; 81 TAILQ_HEAD(, key_entry) public_keys; 82 83 /* Client/Server authentication context */ 84 void *authctxt; 85 86 /* Channels context */ 87 struct ssh_channels *chanctxt; 88 89 /* APP data */ 90 void *app_data; 91 }; 92 93 typedef int (ssh_packet_hook_fn)(struct ssh *, struct sshbuf *, 94 u_char *, void *); 95 96 struct ssh *ssh_alloc_session_state(void); 97 struct ssh *ssh_packet_set_connection(struct ssh *, int, int); 98 void ssh_packet_set_timeout(struct ssh *, int, int); 99 int ssh_packet_stop_discard(struct ssh *); 100 int ssh_packet_connection_af(struct ssh *); 101 void ssh_packet_set_nonblocking(struct ssh *); 102 int ssh_packet_get_connection_in(struct ssh *); 103 int ssh_packet_get_connection_out(struct ssh *); 104 void ssh_packet_close(struct ssh *); 105 void ssh_packet_set_input_hook(struct ssh *, ssh_packet_hook_fn *, void *); 106 void ssh_packet_clear_keys(struct ssh *); 107 void ssh_clear_newkeys(struct ssh *, int); 108 109 int ssh_packet_is_rekeying(struct ssh *); 110 int ssh_packet_check_rekey(struct ssh *); 111 void ssh_packet_set_protocol_flags(struct ssh *, u_int); 112 u_int ssh_packet_get_protocol_flags(struct ssh *); 113 void ssh_packet_set_tos(struct ssh *, int); 114 void ssh_packet_set_interactive(struct ssh *, int, int, int); 115 int ssh_packet_is_interactive(struct ssh *); 116 void ssh_packet_set_server(struct ssh *); 117 void ssh_packet_set_authenticated(struct ssh *); 118 void ssh_packet_set_mux(struct ssh *); 119 int ssh_packet_get_mux(struct ssh *); 120 int ssh_packet_set_log_preamble(struct ssh *, const char *, ...) 121 __attribute__((format(printf, 2, 3))); 122 123 int ssh_packet_log_type(u_char); 124 125 int ssh_packet_send2_wrapped(struct ssh *); 126 int ssh_packet_send2(struct ssh *); 127 128 int ssh_packet_read(struct ssh *); 129 int ssh_packet_read_poll2(struct ssh *, u_char *, u_int32_t *seqnr_p); 130 int ssh_packet_process_incoming(struct ssh *, const char *buf, u_int len); 131 int ssh_packet_process_read(struct ssh *, int); 132 int ssh_packet_read_seqnr(struct ssh *, u_char *, u_int32_t *seqnr_p); 133 int ssh_packet_read_poll_seqnr(struct ssh *, u_char *, u_int32_t *seqnr_p); 134 135 void ssh_packet_disconnect(struct ssh *, const char *fmt, ...) 136 __attribute__((format(printf, 2, 3))) 137 __attribute__((noreturn)); 138 void ssh_packet_send_debug(struct ssh *, const char *fmt, ...) __attribute__((format(printf, 2, 3))); 139 140 int ssh_set_newkeys(struct ssh *, int mode); 141 void ssh_packet_get_bytes(struct ssh *, u_int64_t *, u_int64_t *); 142 143 int ssh_packet_write_poll(struct ssh *); 144 int ssh_packet_write_wait(struct ssh *); 145 int ssh_packet_have_data_to_write(struct ssh *); 146 int ssh_packet_not_very_much_data_to_write(struct ssh *); 147 int ssh_packet_interactive_data_to_write(struct ssh *); 148 149 int ssh_packet_connection_is_on_socket(struct ssh *); 150 int ssh_packet_remaining(struct ssh *); 151 152 void ssh_tty_make_modes(struct ssh *, int, struct termios *); 153 void ssh_tty_parse_modes(struct ssh *, int); 154 155 void ssh_packet_set_alive_timeouts(struct ssh *, int); 156 int ssh_packet_inc_alive_timeouts(struct ssh *); 157 int ssh_packet_set_maxsize(struct ssh *, u_int); 158 u_int ssh_packet_get_maxsize(struct ssh *); 159 160 int ssh_packet_get_state(struct ssh *, struct sshbuf *); 161 int ssh_packet_set_state(struct ssh *, struct sshbuf *); 162 163 const char *ssh_remote_ipaddr(struct ssh *); 164 int ssh_remote_port(struct ssh *); 165 const char *ssh_local_ipaddr(struct ssh *); 166 int ssh_local_port(struct ssh *); 167 const char *ssh_packet_rdomain_in(struct ssh *); 168 char *ssh_remote_hostname(struct ssh *); 169 170 void ssh_packet_set_rekey_limits(struct ssh *, u_int64_t, u_int32_t); 171 time_t ssh_packet_get_rekey_timeout(struct ssh *); 172 173 void *ssh_packet_get_input(struct ssh *); 174 void *ssh_packet_get_output(struct ssh *); 175 176 /* new API */ 177 int sshpkt_start(struct ssh *ssh, u_char type); 178 int sshpkt_send(struct ssh *ssh); 179 int sshpkt_disconnect(struct ssh *, const char *fmt, ...) 180 __attribute__((format(printf, 2, 3))); 181 int sshpkt_add_padding(struct ssh *, u_char); 182 void sshpkt_fatal(struct ssh *ssh, int r, const char *fmt, ...) 183 __attribute__((format(printf, 3, 4))) 184 __attribute__((noreturn)); 185 int sshpkt_msg_ignore(struct ssh *, u_int); 186 187 int sshpkt_put(struct ssh *ssh, const void *v, size_t len); 188 int sshpkt_putb(struct ssh *ssh, const struct sshbuf *b); 189 int sshpkt_put_u8(struct ssh *ssh, u_char val); 190 int sshpkt_put_u32(struct ssh *ssh, u_int32_t val); 191 int sshpkt_put_u64(struct ssh *ssh, u_int64_t val); 192 int sshpkt_put_string(struct ssh *ssh, const void *v, size_t len); 193 int sshpkt_put_cstring(struct ssh *ssh, const void *v); 194 int sshpkt_put_stringb(struct ssh *ssh, const struct sshbuf *v); 195 int sshpkt_put_ec(struct ssh *ssh, const EC_POINT *v, const EC_GROUP *g); 196 int sshpkt_put_ec_pkey(struct ssh *ssh, EVP_PKEY *pkey); 197 int sshpkt_put_bignum2(struct ssh *ssh, const BIGNUM *v); 198 199 int sshpkt_get(struct ssh *ssh, void *valp, size_t len); 200 int sshpkt_get_u8(struct ssh *ssh, u_char *valp); 201 int sshpkt_get_u32(struct ssh *ssh, u_int32_t *valp); 202 int sshpkt_get_u64(struct ssh *ssh, u_int64_t *valp); 203 int sshpkt_get_string(struct ssh *ssh, u_char **valp, size_t *lenp); 204 int sshpkt_get_string_direct(struct ssh *ssh, const u_char **valp, size_t *lenp); 205 int sshpkt_peek_string_direct(struct ssh *ssh, const u_char **valp, size_t *lenp); 206 int sshpkt_get_cstring(struct ssh *ssh, char **valp, size_t *lenp); 207 int sshpkt_getb_froms(struct ssh *ssh, struct sshbuf **valp); 208 int sshpkt_get_ec(struct ssh *ssh, EC_POINT *v, const EC_GROUP *g); 209 int sshpkt_get_bignum2(struct ssh *ssh, BIGNUM **valp); 210 int sshpkt_get_end(struct ssh *ssh); 211 void sshpkt_fmt_connection_id(struct ssh *ssh, char *s, size_t l); 212 const u_char *sshpkt_ptr(struct ssh *, size_t *lenp); 213 214 #if !defined(WITH_OPENSSL) 215 # undef BIGNUM 216 # undef EC_KEY 217 # undef EC_GROUP 218 # undef EC_POINT 219 # undef EVP_PKEY 220 #elif !defined(OPENSSL_HAS_ECC) 221 # undef EC_KEY 222 # undef EC_GROUP 223 # undef EC_POINT 224 #endif 225 226 #endif /* PACKET_H */ 227