Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1 | /* |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 2 | * Author: Tatu Ylonen <ylo@cs.hut.fi> |
| 3 | * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland |
| 4 | * All rights reserved |
| 5 | * Created: Fri Mar 17 17:09:28 1995 ylo |
| 6 | * This program is the ssh daemon. It listens for connections from clients, and |
| 7 | * performs authentication, executes use commands or shell, and forwards |
| 8 | * information to/from the application to the user client over an encrypted |
| 9 | * connection. This can also handle forwarding of X11, TCP/IP, and authentication |
| 10 | * agent connections. |
| 11 | */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 12 | |
| 13 | #include "includes.h" |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame^] | 14 | RCSID("$OpenBSD: sshd.c,v 1.96 2000/03/28 21:15:45 markus Exp $"); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 15 | |
| 16 | #include "xmalloc.h" |
| 17 | #include "rsa.h" |
| 18 | #include "ssh.h" |
| 19 | #include "pty.h" |
| 20 | #include "packet.h" |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 21 | #include "cipher.h" |
| 22 | #include "mpaux.h" |
| 23 | #include "servconf.h" |
| 24 | #include "uidswap.h" |
| 25 | #include "compat.h" |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame^] | 26 | #include "buffer.h" |
| 27 | |
| 28 | #ifdef HAVE_OPENSSL |
| 29 | # include <openssl/dh.h> |
| 30 | # include <openssl/bn.h> |
| 31 | # include <openssl/hmac.h> |
| 32 | # include <openssl/dsa.h> |
| 33 | # include <openssl/rsa.h> |
| 34 | #endif |
| 35 | #ifdef HAVE_SSL |
| 36 | # include <ssl/dh.h> |
| 37 | # include <ssl/bn.h> |
| 38 | # include <ssl/hmac.h> |
| 39 | # include <ssl/dsa.h> |
| 40 | # include <ssl/rsa.h> |
| 41 | #endif |
| 42 | #include "key.h" |
| 43 | |
| 44 | #include "auth.h" |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 45 | |
| 46 | #ifdef LIBWRAP |
| 47 | #include <tcpd.h> |
| 48 | #include <syslog.h> |
| 49 | int allow_severity = LOG_INFO; |
| 50 | int deny_severity = LOG_WARNING; |
| 51 | #endif /* LIBWRAP */ |
| 52 | |
| 53 | #ifndef O_NOCTTY |
| 54 | #define O_NOCTTY 0 |
| 55 | #endif |
| 56 | |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 57 | /* Server configuration options. */ |
| 58 | ServerOptions options; |
| 59 | |
| 60 | /* Name of the server configuration file. */ |
| 61 | char *config_file_name = SERVER_CONFIG_FILE; |
| 62 | |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 63 | /* |
| 64 | * Flag indicating whether IPv4 or IPv6. This can be set on the command line. |
| 65 | * Default value is AF_UNSPEC means both IPv4 and IPv6. |
| 66 | */ |
Damien Miller | 7d80e34 | 2000-01-19 14:36:49 +1100 | [diff] [blame] | 67 | #ifdef IPV4_DEFAULT |
| 68 | int IPv4or6 = AF_INET; |
| 69 | #else |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 70 | int IPv4or6 = AF_UNSPEC; |
Damien Miller | 7d80e34 | 2000-01-19 14:36:49 +1100 | [diff] [blame] | 71 | #endif |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 72 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 73 | /* |
| 74 | * Debug mode flag. This can be set on the command line. If debug |
| 75 | * mode is enabled, extra debugging output will be sent to the system |
| 76 | * log, the daemon will not go to background, and will exit after processing |
| 77 | * the first connection. |
| 78 | */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 79 | int debug_flag = 0; |
| 80 | |
| 81 | /* Flag indicating that the daemon is being started from inetd. */ |
| 82 | int inetd_flag = 0; |
| 83 | |
Damien Miller | 5ce662a | 1999-11-11 17:57:39 +1100 | [diff] [blame] | 84 | /* debug goes to stderr unless inetd_flag is set */ |
| 85 | int log_stderr = 0; |
| 86 | |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 87 | /* argv[0] without path. */ |
| 88 | char *av0; |
| 89 | |
| 90 | /* Saved arguments to main(). */ |
| 91 | char **saved_argv; |
| 92 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 93 | /* |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 94 | * The sockets that the server is listening; this is used in the SIGHUP |
| 95 | * signal handler. |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 96 | */ |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 97 | #define MAX_LISTEN_SOCKS 16 |
| 98 | int listen_socks[MAX_LISTEN_SOCKS]; |
| 99 | int num_listen_socks = 0; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 100 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 101 | /* |
| 102 | * the client's version string, passed by sshd2 in compat mode. if != NULL, |
| 103 | * sshd will skip the version-number exchange |
| 104 | */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 105 | char *client_version_string = NULL; |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame^] | 106 | char *server_version_string = NULL; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 107 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 108 | /* |
| 109 | * Any really sensitive data in the application is contained in this |
| 110 | * structure. The idea is that this structure could be locked into memory so |
| 111 | * that the pages do not get written into swap. However, there are some |
| 112 | * problems. The private key contains BIGNUMs, and we do not (in principle) |
| 113 | * have access to the internals of them, and locking just the structure is |
| 114 | * not very useful. Currently, memory locking is not implemented. |
| 115 | */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 116 | struct { |
| 117 | RSA *private_key; /* Private part of server key. */ |
| 118 | RSA *host_key; /* Private part of host key. */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 119 | } sensitive_data; |
| 120 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 121 | /* |
| 122 | * Flag indicating whether the current session key has been used. This flag |
| 123 | * is set whenever the key is used, and cleared when the key is regenerated. |
| 124 | */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 125 | int key_used = 0; |
| 126 | |
| 127 | /* This is set to true when SIGHUP is received. */ |
| 128 | int received_sighup = 0; |
| 129 | |
| 130 | /* Public side of the server key. This value is regenerated regularly with |
| 131 | the private key. */ |
| 132 | RSA *public_key; |
| 133 | |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame^] | 134 | /* session identifier, used by RSA-auth */ |
| 135 | unsigned char session_id[16]; |
| 136 | |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 137 | /* Prototypes for various functions defined later in this file. */ |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame^] | 138 | void do_ssh1_kex(); |
Damien Miller | 98c7ad6 | 2000-03-09 21:27:49 +1100 | [diff] [blame] | 139 | |
| 140 | /* |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 141 | * Close all listening sockets |
| 142 | */ |
| 143 | void |
| 144 | close_listen_socks(void) |
| 145 | { |
| 146 | int i; |
| 147 | for (i = 0; i < num_listen_socks; i++) |
| 148 | close(listen_socks[i]); |
| 149 | num_listen_socks = -1; |
| 150 | } |
| 151 | |
| 152 | /* |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 153 | * Signal handler for SIGHUP. Sshd execs itself when it receives SIGHUP; |
| 154 | * the effect is to reread the configuration file (and to regenerate |
| 155 | * the server key). |
| 156 | */ |
| 157 | void |
| 158 | sighup_handler(int sig) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 159 | { |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 160 | received_sighup = 1; |
| 161 | signal(SIGHUP, sighup_handler); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 162 | } |
| 163 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 164 | /* |
| 165 | * Called from the main program after receiving SIGHUP. |
| 166 | * Restarts the server. |
| 167 | */ |
| 168 | void |
| 169 | sighup_restart() |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 170 | { |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 171 | log("Received SIGHUP; restarting."); |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 172 | close_listen_socks(); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 173 | execv(saved_argv[0], saved_argv); |
| 174 | log("RESTART FAILED: av0='%s', error: %s.", av0, strerror(errno)); |
| 175 | exit(1); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 176 | } |
| 177 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 178 | /* |
| 179 | * Generic signal handler for terminating signals in the master daemon. |
| 180 | * These close the listen socket; not closing it seems to cause "Address |
| 181 | * already in use" problems on some machines, which is inconvenient. |
| 182 | */ |
| 183 | void |
| 184 | sigterm_handler(int sig) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 185 | { |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 186 | log("Received signal %d; terminating.", sig); |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 187 | close_listen_socks(); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 188 | exit(255); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 189 | } |
| 190 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 191 | /* |
| 192 | * SIGCHLD handler. This is called whenever a child dies. This will then |
| 193 | * reap any zombies left by exited c. |
| 194 | */ |
| 195 | void |
| 196 | main_sigchld_handler(int sig) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 197 | { |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 198 | int save_errno = errno; |
| 199 | int status; |
Damien Miller | 431f66b | 1999-11-21 18:31:57 +1100 | [diff] [blame] | 200 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 201 | while (waitpid(-1, &status, WNOHANG) > 0) |
| 202 | ; |
Damien Miller | 431f66b | 1999-11-21 18:31:57 +1100 | [diff] [blame] | 203 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 204 | signal(SIGCHLD, main_sigchld_handler); |
| 205 | errno = save_errno; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 206 | } |
| 207 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 208 | /* |
| 209 | * Signal handler for the alarm after the login grace period has expired. |
| 210 | */ |
| 211 | void |
| 212 | grace_alarm_handler(int sig) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 213 | { |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 214 | /* Close the connection. */ |
| 215 | packet_close(); |
| 216 | |
| 217 | /* Log error and exit. */ |
| 218 | fatal("Timeout before authentication for %s.", get_remote_ipaddr()); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 219 | } |
| 220 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 221 | /* |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 222 | * Signal handler for the key regeneration alarm. Note that this |
| 223 | * alarm only occurs in the daemon waiting for connections, and it does not |
| 224 | * do anything with the private key or random state before forking. |
| 225 | * Thus there should be no concurrency control/asynchronous execution |
| 226 | * problems. |
| 227 | */ |
| 228 | void |
| 229 | key_regeneration_alarm(int sig) |
| 230 | { |
| 231 | int save_errno = errno; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 232 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 233 | /* Check if we should generate a new key. */ |
| 234 | if (key_used) { |
| 235 | /* This should really be done in the background. */ |
| 236 | log("Generating new %d bit RSA key.", options.server_key_bits); |
| 237 | |
| 238 | if (sensitive_data.private_key != NULL) |
| 239 | RSA_free(sensitive_data.private_key); |
| 240 | sensitive_data.private_key = RSA_new(); |
| 241 | |
| 242 | if (public_key != NULL) |
| 243 | RSA_free(public_key); |
| 244 | public_key = RSA_new(); |
| 245 | |
| 246 | rsa_generate_key(sensitive_data.private_key, public_key, |
| 247 | options.server_key_bits); |
| 248 | arc4random_stir(); |
| 249 | key_used = 0; |
| 250 | log("RSA key generation complete."); |
| 251 | } |
| 252 | /* Reschedule the alarm. */ |
| 253 | signal(SIGALRM, key_regeneration_alarm); |
| 254 | alarm(options.key_regeneration_time); |
| 255 | errno = save_errno; |
| 256 | } |
| 257 | |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame^] | 258 | void |
| 259 | sshd_exchange_identification(int sock_in, int sock_out) |
| 260 | { |
| 261 | int i; |
| 262 | int remote_major, remote_minor; |
| 263 | char *s; |
| 264 | char buf[256]; /* Must not be larger than remote_version. */ |
| 265 | char remote_version[256]; /* Must be at least as big as buf. */ |
| 266 | |
| 267 | snprintf(buf, sizeof buf, "SSH-%d.%d-%.100s\n", |
| 268 | PROTOCOL_MAJOR, PROTOCOL_MINOR, SSH_VERSION); |
| 269 | server_version_string = xstrdup(buf); |
| 270 | |
| 271 | if (client_version_string == NULL) { |
| 272 | /* Send our protocol version identification. */ |
| 273 | if (atomicio(write, sock_out, server_version_string, strlen(server_version_string)) |
| 274 | != strlen(server_version_string)) { |
| 275 | log("Could not write ident string to %s.", get_remote_ipaddr()); |
| 276 | fatal_cleanup(); |
| 277 | } |
| 278 | |
| 279 | /* Read other side\'s version identification. */ |
| 280 | for (i = 0; i < sizeof(buf) - 1; i++) { |
| 281 | if (read(sock_in, &buf[i], 1) != 1) { |
| 282 | log("Did not receive ident string from %s.", get_remote_ipaddr()); |
| 283 | fatal_cleanup(); |
| 284 | } |
| 285 | if (buf[i] == '\r') { |
| 286 | buf[i] = '\n'; |
| 287 | buf[i + 1] = 0; |
| 288 | continue; |
| 289 | /*break; XXX eat \r */ |
| 290 | } |
| 291 | if (buf[i] == '\n') { |
| 292 | /* buf[i] == '\n' */ |
| 293 | buf[i + 1] = 0; |
| 294 | break; |
| 295 | } |
| 296 | } |
| 297 | buf[sizeof(buf) - 1] = 0; |
| 298 | client_version_string = xstrdup(buf); |
| 299 | } |
| 300 | |
| 301 | /* |
| 302 | * Check that the versions match. In future this might accept |
| 303 | * several versions and set appropriate flags to handle them. |
| 304 | */ |
| 305 | if (sscanf(client_version_string, "SSH-%d.%d-%[^\n]\n", |
| 306 | &remote_major, &remote_minor, remote_version) != 3) { |
| 307 | s = "Protocol mismatch.\n"; |
| 308 | (void) atomicio(write, sock_out, s, strlen(s)); |
| 309 | close(sock_in); |
| 310 | close(sock_out); |
| 311 | log("Bad protocol version identification '%.100s' from %s", |
| 312 | client_version_string, get_remote_ipaddr()); |
| 313 | fatal_cleanup(); |
| 314 | } |
| 315 | debug("Client protocol version %d.%d; client software version %.100s", |
| 316 | remote_major, remote_minor, remote_version); |
| 317 | |
| 318 | switch(remote_major) { |
| 319 | case 1: |
| 320 | if (remote_minor < 3) { |
| 321 | packet_disconnect("Your ssh version is too old and" |
| 322 | "is no longer supported. Please install a newer version."); |
| 323 | } else if (remote_minor == 3) { |
| 324 | /* note that this disables agent-forwarding */ |
| 325 | enable_compat13(); |
| 326 | } |
| 327 | break; |
| 328 | default: |
| 329 | s = "Protocol major versions differ.\n"; |
| 330 | (void) atomicio(write, sock_out, s, strlen(s)); |
| 331 | close(sock_in); |
| 332 | close(sock_out); |
| 333 | log("Protocol major versions differ for %s: %d vs. %d", |
| 334 | get_remote_ipaddr(), PROTOCOL_MAJOR, remote_major); |
| 335 | fatal_cleanup(); |
| 336 | break; |
| 337 | } |
| 338 | } |
| 339 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 340 | /* |
| 341 | * Main program for the daemon. |
| 342 | */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 343 | int |
| 344 | main(int ac, char **av) |
| 345 | { |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 346 | extern char *optarg; |
| 347 | extern int optind; |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 348 | int opt, sock_in = 0, sock_out = 0, newsock, i, fdsetsz, pid, on = 1; |
| 349 | socklen_t fromlen; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 350 | int silentrsa = 0; |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 351 | fd_set *fdset; |
| 352 | struct sockaddr_storage from; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 353 | const char *remote_ip; |
| 354 | int remote_port; |
| 355 | char *comment; |
| 356 | FILE *f; |
| 357 | struct linger linger; |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 358 | struct addrinfo *ai; |
| 359 | char ntop[NI_MAXHOST], strport[NI_MAXSERV]; |
| 360 | int listen_sock, maxfd; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 361 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 362 | /* Save argv[0]. */ |
| 363 | saved_argv = av; |
| 364 | if (strchr(av[0], '/')) |
| 365 | av0 = strrchr(av[0], '/') + 1; |
| 366 | else |
| 367 | av0 = av[0]; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 368 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 369 | /* Initialize configuration options to their default values. */ |
| 370 | initialize_server_options(&options); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 371 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 372 | /* Parse command-line arguments. */ |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 373 | while ((opt = getopt(ac, av, "f:p:b:k:h:g:V:diqQ46")) != EOF) { |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 374 | switch (opt) { |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 375 | case '4': |
| 376 | IPv4or6 = AF_INET; |
| 377 | break; |
| 378 | case '6': |
| 379 | IPv4or6 = AF_INET6; |
| 380 | break; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 381 | case 'f': |
| 382 | config_file_name = optarg; |
| 383 | break; |
| 384 | case 'd': |
| 385 | debug_flag = 1; |
| 386 | options.log_level = SYSLOG_LEVEL_DEBUG; |
| 387 | break; |
| 388 | case 'i': |
| 389 | inetd_flag = 1; |
| 390 | break; |
| 391 | case 'Q': |
| 392 | silentrsa = 1; |
| 393 | break; |
| 394 | case 'q': |
| 395 | options.log_level = SYSLOG_LEVEL_QUIET; |
| 396 | break; |
| 397 | case 'b': |
| 398 | options.server_key_bits = atoi(optarg); |
| 399 | break; |
| 400 | case 'p': |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 401 | options.ports_from_cmdline = 1; |
| 402 | if (options.num_ports >= MAX_PORTS) |
| 403 | fatal("too many ports.\n"); |
| 404 | options.ports[options.num_ports++] = atoi(optarg); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 405 | break; |
| 406 | case 'g': |
| 407 | options.login_grace_time = atoi(optarg); |
| 408 | break; |
| 409 | case 'k': |
| 410 | options.key_regeneration_time = atoi(optarg); |
| 411 | break; |
| 412 | case 'h': |
| 413 | options.host_key_file = optarg; |
| 414 | break; |
| 415 | case 'V': |
| 416 | client_version_string = optarg; |
| 417 | /* only makes sense with inetd_flag, i.e. no listen() */ |
| 418 | inetd_flag = 1; |
| 419 | break; |
| 420 | case '?': |
| 421 | default: |
| 422 | fprintf(stderr, "sshd version %s\n", SSH_VERSION); |
| 423 | fprintf(stderr, "Usage: %s [options]\n", av0); |
| 424 | fprintf(stderr, "Options:\n"); |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 425 | fprintf(stderr, " -f file Configuration file (default %s)\n", SERVER_CONFIG_FILE); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 426 | fprintf(stderr, " -d Debugging mode\n"); |
| 427 | fprintf(stderr, " -i Started from inetd\n"); |
| 428 | fprintf(stderr, " -q Quiet (no logging)\n"); |
| 429 | fprintf(stderr, " -p port Listen on the specified port (default: 22)\n"); |
| 430 | fprintf(stderr, " -k seconds Regenerate server key every this many seconds (default: 3600)\n"); |
| 431 | fprintf(stderr, " -g seconds Grace period for authentication (default: 300)\n"); |
| 432 | fprintf(stderr, " -b bits Size of server RSA key (default: 768 bits)\n"); |
| 433 | fprintf(stderr, " -h file File from which to read host key (default: %s)\n", |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 434 | HOST_KEY_FILE); |
| 435 | fprintf(stderr, " -4 Use IPv4 only\n"); |
| 436 | fprintf(stderr, " -6 Use IPv6 only\n"); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 437 | exit(1); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 438 | } |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 439 | } |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 440 | |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 441 | /* |
| 442 | * Force logging to stderr until we have loaded the private host |
| 443 | * key (unless started from inetd) |
| 444 | */ |
| 445 | log_init(av0, |
| 446 | options.log_level == -1 ? SYSLOG_LEVEL_INFO : options.log_level, |
| 447 | options.log_facility == -1 ? SYSLOG_FACILITY_AUTH : options.log_facility, |
| 448 | !inetd_flag); |
| 449 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 450 | /* check if RSA support exists */ |
| 451 | if (rsa_alive() == 0) { |
| 452 | if (silentrsa == 0) |
| 453 | printf("sshd: no RSA support in libssl and libcrypto -- exiting. See ssl(8)\n"); |
| 454 | log("no RSA support in libssl and libcrypto -- exiting. See ssl(8)"); |
| 455 | exit(1); |
| 456 | } |
| 457 | /* Read server configuration options from the configuration file. */ |
| 458 | read_server_config(&options, config_file_name); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 459 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 460 | /* Fill in default values for those options not explicitly set. */ |
| 461 | fill_default_server_options(&options); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 462 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 463 | /* Check certain values for sanity. */ |
| 464 | if (options.server_key_bits < 512 || |
| 465 | options.server_key_bits > 32768) { |
| 466 | fprintf(stderr, "Bad server key size.\n"); |
| 467 | exit(1); |
| 468 | } |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 469 | /* Check that there are no remaining arguments. */ |
| 470 | if (optind < ac) { |
| 471 | fprintf(stderr, "Extra argument %s.\n", av[optind]); |
| 472 | exit(1); |
| 473 | } |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 474 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 475 | debug("sshd version %.100s", SSH_VERSION); |
Damien Miller | 2ccf661 | 1999-11-15 15:25:10 +1100 | [diff] [blame] | 476 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 477 | sensitive_data.host_key = RSA_new(); |
| 478 | errno = 0; |
| 479 | /* Load the host key. It must have empty passphrase. */ |
| 480 | if (!load_private_key(options.host_key_file, "", |
| 481 | sensitive_data.host_key, &comment)) { |
| 482 | error("Could not load host key: %.200s: %.100s", |
| 483 | options.host_key_file, strerror(errno)); |
| 484 | exit(1); |
| 485 | } |
| 486 | xfree(comment); |
| 487 | |
| 488 | /* Initialize the log (it is reinitialized below in case we |
| 489 | forked). */ |
| 490 | if (debug_flag && !inetd_flag) |
| 491 | log_stderr = 1; |
| 492 | log_init(av0, options.log_level, options.log_facility, log_stderr); |
| 493 | |
| 494 | /* If not in debugging mode, and not started from inetd, |
| 495 | disconnect from the controlling terminal, and fork. The |
| 496 | original process exits. */ |
| 497 | if (!debug_flag && !inetd_flag) { |
| 498 | #ifdef TIOCNOTTY |
| 499 | int fd; |
| 500 | #endif /* TIOCNOTTY */ |
| 501 | if (daemon(0, 0) < 0) |
| 502 | fatal("daemon() failed: %.200s", strerror(errno)); |
| 503 | |
| 504 | /* Disconnect from the controlling tty. */ |
| 505 | #ifdef TIOCNOTTY |
| 506 | fd = open("/dev/tty", O_RDWR | O_NOCTTY); |
| 507 | if (fd >= 0) { |
| 508 | (void) ioctl(fd, TIOCNOTTY, NULL); |
| 509 | close(fd); |
| 510 | } |
| 511 | #endif /* TIOCNOTTY */ |
| 512 | } |
| 513 | /* Reinitialize the log (because of the fork above). */ |
| 514 | log_init(av0, options.log_level, options.log_facility, log_stderr); |
| 515 | |
| 516 | /* Check that server and host key lengths differ sufficiently. |
| 517 | This is necessary to make double encryption work with rsaref. |
| 518 | Oh, I hate software patents. I dont know if this can go? Niels */ |
| 519 | if (options.server_key_bits > |
| 520 | BN_num_bits(sensitive_data.host_key->n) - SSH_KEY_BITS_RESERVED && |
| 521 | options.server_key_bits < |
| 522 | BN_num_bits(sensitive_data.host_key->n) + SSH_KEY_BITS_RESERVED) { |
| 523 | options.server_key_bits = |
| 524 | BN_num_bits(sensitive_data.host_key->n) + SSH_KEY_BITS_RESERVED; |
| 525 | debug("Forcing server key to %d bits to make it differ from host key.", |
| 526 | options.server_key_bits); |
| 527 | } |
| 528 | /* Do not display messages to stdout in RSA code. */ |
| 529 | rsa_set_verbose(0); |
| 530 | |
| 531 | /* Initialize the random number generator. */ |
| 532 | arc4random_stir(); |
| 533 | |
| 534 | /* Chdir to the root directory so that the current disk can be |
| 535 | unmounted if desired. */ |
| 536 | chdir("/"); |
| 537 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 538 | /* Start listening for a socket, unless started from inetd. */ |
| 539 | if (inetd_flag) { |
| 540 | int s1, s2; |
| 541 | s1 = dup(0); /* Make sure descriptors 0, 1, and 2 are in use. */ |
| 542 | s2 = dup(s1); |
| 543 | sock_in = dup(0); |
| 544 | sock_out = dup(1); |
| 545 | /* We intentionally do not close the descriptors 0, 1, and 2 |
| 546 | as our code for setting the descriptors won\'t work |
| 547 | if ttyfd happens to be one of those. */ |
| 548 | debug("inetd sockets after dupping: %d, %d", sock_in, sock_out); |
| 549 | |
| 550 | public_key = RSA_new(); |
| 551 | sensitive_data.private_key = RSA_new(); |
| 552 | |
| 553 | log("Generating %d bit RSA key.", options.server_key_bits); |
| 554 | rsa_generate_key(sensitive_data.private_key, public_key, |
| 555 | options.server_key_bits); |
| 556 | arc4random_stir(); |
| 557 | log("RSA key generation complete."); |
| 558 | } else { |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 559 | for (ai = options.listen_addrs; ai; ai = ai->ai_next) { |
| 560 | if (ai->ai_family != AF_INET && ai->ai_family != AF_INET6) |
| 561 | continue; |
| 562 | if (num_listen_socks >= MAX_LISTEN_SOCKS) |
| 563 | fatal("Too many listen sockets. " |
| 564 | "Enlarge MAX_LISTEN_SOCKS"); |
| 565 | if (getnameinfo(ai->ai_addr, ai->ai_addrlen, |
| 566 | ntop, sizeof(ntop), strport, sizeof(strport), |
| 567 | NI_NUMERICHOST|NI_NUMERICSERV) != 0) { |
| 568 | error("getnameinfo failed"); |
| 569 | continue; |
| 570 | } |
| 571 | /* Create socket for listening. */ |
| 572 | listen_sock = socket(ai->ai_family, SOCK_STREAM, 0); |
| 573 | if (listen_sock < 0) { |
| 574 | /* kernel may not support ipv6 */ |
| 575 | verbose("socket: %.100s", strerror(errno)); |
| 576 | continue; |
| 577 | } |
| 578 | if (fcntl(listen_sock, F_SETFL, O_NONBLOCK) < 0) { |
| 579 | error("listen_sock O_NONBLOCK: %s", strerror(errno)); |
| 580 | close(listen_sock); |
| 581 | continue; |
| 582 | } |
| 583 | /* |
| 584 | * Set socket options. We try to make the port |
| 585 | * reusable and have it close as fast as possible |
| 586 | * without waiting in unnecessary wait states on |
| 587 | * close. |
| 588 | */ |
| 589 | setsockopt(listen_sock, SOL_SOCKET, SO_REUSEADDR, |
| 590 | (void *) &on, sizeof(on)); |
| 591 | linger.l_onoff = 1; |
| 592 | linger.l_linger = 5; |
| 593 | setsockopt(listen_sock, SOL_SOCKET, SO_LINGER, |
| 594 | (void *) &linger, sizeof(linger)); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 595 | |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 596 | debug("Bind to port %s on %s.", strport, ntop); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 597 | |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 598 | /* Bind the socket to the desired port. */ |
Damien Miller | 3c7eeb2 | 2000-03-03 22:35:33 +1100 | [diff] [blame] | 599 | if ((bind(listen_sock, ai->ai_addr, ai->ai_addrlen) < 0) && |
| 600 | (!ai->ai_next)) { |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 601 | error("Bind to port %s on %s failed: %.200s.", |
| 602 | strport, ntop, strerror(errno)); |
| 603 | close(listen_sock); |
| 604 | continue; |
| 605 | } |
| 606 | listen_socks[num_listen_socks] = listen_sock; |
| 607 | num_listen_socks++; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 608 | |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 609 | /* Start listening on the port. */ |
| 610 | log("Server listening on %s port %s.", ntop, strport); |
| 611 | if (listen(listen_sock, 5) < 0) |
| 612 | fatal("listen: %.100s", strerror(errno)); |
| 613 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 614 | } |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 615 | freeaddrinfo(options.listen_addrs); |
| 616 | |
| 617 | if (!num_listen_socks) |
| 618 | fatal("Cannot bind any address."); |
| 619 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 620 | if (!debug_flag) { |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 621 | /* |
| 622 | * Record our pid in /etc/sshd_pid to make it easier |
| 623 | * to kill the correct sshd. We don\'t want to do |
| 624 | * this before the bind above because the bind will |
| 625 | * fail if there already is a daemon, and this will |
| 626 | * overwrite any old pid in the file. |
| 627 | */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 628 | f = fopen(SSH_DAEMON_PID_FILE, "w"); |
| 629 | if (f) { |
| 630 | fprintf(f, "%u\n", (unsigned int) getpid()); |
| 631 | fclose(f); |
| 632 | } |
| 633 | } |
| 634 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 635 | public_key = RSA_new(); |
| 636 | sensitive_data.private_key = RSA_new(); |
| 637 | |
| 638 | log("Generating %d bit RSA key.", options.server_key_bits); |
| 639 | rsa_generate_key(sensitive_data.private_key, public_key, |
| 640 | options.server_key_bits); |
| 641 | arc4random_stir(); |
| 642 | log("RSA key generation complete."); |
| 643 | |
| 644 | /* Schedule server key regeneration alarm. */ |
| 645 | signal(SIGALRM, key_regeneration_alarm); |
| 646 | alarm(options.key_regeneration_time); |
| 647 | |
| 648 | /* Arrange to restart on SIGHUP. The handler needs listen_sock. */ |
| 649 | signal(SIGHUP, sighup_handler); |
| 650 | signal(SIGTERM, sigterm_handler); |
| 651 | signal(SIGQUIT, sigterm_handler); |
| 652 | |
| 653 | /* Arrange SIGCHLD to be caught. */ |
| 654 | signal(SIGCHLD, main_sigchld_handler); |
| 655 | |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 656 | /* setup fd set for listen */ |
| 657 | maxfd = 0; |
| 658 | for (i = 0; i < num_listen_socks; i++) |
| 659 | if (listen_socks[i] > maxfd) |
| 660 | maxfd = listen_socks[i]; |
| 661 | fdsetsz = howmany(maxfd, NFDBITS) * sizeof(fd_mask); |
| 662 | fdset = (fd_set *)xmalloc(fdsetsz); |
| 663 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 664 | /* |
| 665 | * Stay listening for connections until the system crashes or |
| 666 | * the daemon is killed with a signal. |
| 667 | */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 668 | for (;;) { |
| 669 | if (received_sighup) |
| 670 | sighup_restart(); |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 671 | /* Wait in select until there is a connection. */ |
| 672 | memset(fdset, 0, fdsetsz); |
| 673 | for (i = 0; i < num_listen_socks; i++) |
| 674 | FD_SET(listen_socks[i], fdset); |
| 675 | if (select(maxfd + 1, fdset, NULL, NULL, NULL) < 0) { |
| 676 | if (errno != EINTR) |
| 677 | error("select: %.100s", strerror(errno)); |
Damien Miller | 50945fa | 1999-12-09 10:31:37 +1100 | [diff] [blame] | 678 | continue; |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 679 | } |
| 680 | for (i = 0; i < num_listen_socks; i++) { |
| 681 | if (!FD_ISSET(listen_socks[i], fdset)) |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 682 | continue; |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 683 | fromlen = sizeof(from); |
| 684 | newsock = accept(listen_socks[i], (struct sockaddr *)&from, |
| 685 | &fromlen); |
| 686 | if (newsock < 0) { |
| 687 | if (errno != EINTR && errno != EWOULDBLOCK) |
| 688 | error("accept: %.100s", strerror(errno)); |
| 689 | continue; |
| 690 | } |
| 691 | if (fcntl(newsock, F_SETFL, 0) < 0) { |
| 692 | error("newsock del O_NONBLOCK: %s", strerror(errno)); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 693 | continue; |
| 694 | } |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 695 | /* |
| 696 | * Got connection. Fork a child to handle it, unless |
| 697 | * we are in debugging mode. |
| 698 | */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 699 | if (debug_flag) { |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 700 | /* |
| 701 | * In debugging mode. Close the listening |
| 702 | * socket, and start processing the |
| 703 | * connection without forking. |
| 704 | */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 705 | debug("Server will not fork when running in debugging mode."); |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 706 | close_listen_socks(); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 707 | sock_in = newsock; |
| 708 | sock_out = newsock; |
| 709 | pid = getpid(); |
| 710 | break; |
| 711 | } else { |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 712 | /* |
| 713 | * Normal production daemon. Fork, and have |
| 714 | * the child process the connection. The |
| 715 | * parent continues listening. |
| 716 | */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 717 | if ((pid = fork()) == 0) { |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 718 | /* |
| 719 | * Child. Close the listening socket, and start using the |
| 720 | * accepted socket. Reinitialize logging (since our pid has |
| 721 | * changed). We break out of the loop to handle the connection. |
| 722 | */ |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 723 | close_listen_socks(); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 724 | sock_in = newsock; |
| 725 | sock_out = newsock; |
| 726 | log_init(av0, options.log_level, options.log_facility, log_stderr); |
| 727 | break; |
| 728 | } |
| 729 | } |
| 730 | |
| 731 | /* Parent. Stay in the loop. */ |
| 732 | if (pid < 0) |
| 733 | error("fork: %.100s", strerror(errno)); |
| 734 | else |
| 735 | debug("Forked child %d.", pid); |
| 736 | |
| 737 | /* Mark that the key has been used (it was "given" to the child). */ |
| 738 | key_used = 1; |
| 739 | |
| 740 | arc4random_stir(); |
| 741 | |
| 742 | /* Close the new socket (the child is now taking care of it). */ |
| 743 | close(newsock); |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 744 | } /* for (i = 0; i < num_listen_socks; i++) */ |
| 745 | /* child process check (or debug mode) */ |
| 746 | if (num_listen_socks < 0) |
| 747 | break; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 748 | } |
| 749 | } |
| 750 | |
| 751 | /* This is the child processing a new connection. */ |
| 752 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 753 | /* |
| 754 | * Disable the key regeneration alarm. We will not regenerate the |
| 755 | * key since we are no longer in a position to give it to anyone. We |
| 756 | * will not restart on SIGHUP since it no longer makes sense. |
| 757 | */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 758 | alarm(0); |
| 759 | signal(SIGALRM, SIG_DFL); |
| 760 | signal(SIGHUP, SIG_DFL); |
| 761 | signal(SIGTERM, SIG_DFL); |
| 762 | signal(SIGQUIT, SIG_DFL); |
| 763 | signal(SIGCHLD, SIG_DFL); |
| 764 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 765 | /* |
| 766 | * Set socket options for the connection. We want the socket to |
| 767 | * close as fast as possible without waiting for anything. If the |
| 768 | * connection is not a socket, these will do nothing. |
| 769 | */ |
| 770 | /* setsockopt(sock_in, SOL_SOCKET, SO_REUSEADDR, (void *)&on, sizeof(on)); */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 771 | linger.l_onoff = 1; |
| 772 | linger.l_linger = 5; |
| 773 | setsockopt(sock_in, SOL_SOCKET, SO_LINGER, (void *) &linger, sizeof(linger)); |
| 774 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 775 | /* |
| 776 | * Register our connection. This turns encryption off because we do |
| 777 | * not have a key. |
| 778 | */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 779 | packet_set_connection(sock_in, sock_out); |
| 780 | |
| 781 | remote_port = get_remote_port(); |
| 782 | remote_ip = get_remote_ipaddr(); |
| 783 | |
| 784 | /* Check whether logins are denied from this host. */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 785 | #ifdef LIBWRAP |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 786 | /* XXX LIBWRAP noes not know about IPv6 */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 787 | { |
| 788 | struct request_info req; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 789 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 790 | request_init(&req, RQ_DAEMON, av0, RQ_FILE, sock_in, NULL); |
| 791 | fromhost(&req); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 792 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 793 | if (!hosts_access(&req)) { |
| 794 | close(sock_in); |
| 795 | close(sock_out); |
| 796 | refuse(&req); |
| 797 | } |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 798 | /*XXX IPv6 verbose("Connection from %.500s port %d", eval_client(&req), remote_port); */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 799 | } |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 800 | #endif /* LIBWRAP */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 801 | /* Log the connection. */ |
| 802 | verbose("Connection from %.500s port %d", remote_ip, remote_port); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 803 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 804 | /* |
| 805 | * We don\'t want to listen forever unless the other side |
| 806 | * successfully authenticates itself. So we set up an alarm which is |
| 807 | * cleared after successful authentication. A limit of zero |
| 808 | * indicates no limit. Note that we don\'t set the alarm in debugging |
| 809 | * mode; it is just annoying to have the server exit just when you |
| 810 | * are about to discover the bug. |
| 811 | */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 812 | signal(SIGALRM, grace_alarm_handler); |
| 813 | if (!debug_flag) |
| 814 | alarm(options.login_grace_time); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 815 | |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame^] | 816 | sshd_exchange_identification(sock_in, sock_out); |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 817 | /* |
| 818 | * Check that the connection comes from a privileged port. Rhosts- |
| 819 | * and Rhosts-RSA-Authentication only make sense from priviledged |
| 820 | * programs. Of course, if the intruder has root access on his local |
| 821 | * machine, he can connect from any port. So do not use these |
| 822 | * authentication methods from machines that you do not trust. |
| 823 | */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 824 | if (remote_port >= IPPORT_RESERVED || |
| 825 | remote_port < IPPORT_RESERVED / 2) { |
| 826 | options.rhosts_authentication = 0; |
| 827 | options.rhosts_rsa_authentication = 0; |
| 828 | } |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 829 | #ifdef KRB4 |
| 830 | if (!packet_connection_is_ipv4() && |
| 831 | options.kerberos_authentication) { |
| 832 | debug("Kerberos Authentication disabled, only available for IPv4."); |
| 833 | options.kerberos_authentication = 0; |
| 834 | } |
| 835 | #endif /* KRB4 */ |
| 836 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 837 | packet_set_nonblocking(); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 838 | |
Damien Miller | 396691a | 2000-01-20 22:44:08 +1100 | [diff] [blame] | 839 | /* perform the key exchange */ |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame^] | 840 | do_ssh1_kex(); |
Damien Miller | 396691a | 2000-01-20 22:44:08 +1100 | [diff] [blame] | 841 | /* authenticate user and start session */ |
| 842 | do_authentication(); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 843 | |
| 844 | #ifdef KRB4 |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 845 | /* Cleanup user's ticket cache file. */ |
| 846 | if (options.kerberos_ticket_cleanup) |
| 847 | (void) dest_tkt(); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 848 | #endif /* KRB4 */ |
| 849 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 850 | /* The connection has been terminated. */ |
| 851 | verbose("Closing connection to %.100s", remote_ip); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 852 | |
Damien Miller | beb4ba5 | 1999-12-28 15:09:35 +1100 | [diff] [blame] | 853 | #ifdef USE_PAM |
Damien Miller | e72b7af | 1999-12-30 15:08:44 +1100 | [diff] [blame] | 854 | finish_pam(); |
Damien Miller | beb4ba5 | 1999-12-28 15:09:35 +1100 | [diff] [blame] | 855 | #endif /* USE_PAM */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 856 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 857 | packet_close(); |
| 858 | exit(0); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 859 | } |
| 860 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 861 | /* |
Damien Miller | 396691a | 2000-01-20 22:44:08 +1100 | [diff] [blame] | 862 | * SSH1 key exchange |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 863 | */ |
Damien Miller | 2ccf661 | 1999-11-15 15:25:10 +1100 | [diff] [blame] | 864 | void |
Damien Miller | b38eff8 | 2000-04-01 11:09:21 +1000 | [diff] [blame^] | 865 | do_ssh1_kex() |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 866 | { |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 867 | int i, len; |
Damien Miller | 396691a | 2000-01-20 22:44:08 +1100 | [diff] [blame] | 868 | int plen, slen; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 869 | BIGNUM *session_key_int; |
| 870 | unsigned char session_key[SSH_SESSION_KEY_LENGTH]; |
Damien Miller | 396691a | 2000-01-20 22:44:08 +1100 | [diff] [blame] | 871 | unsigned char cookie[8]; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 872 | unsigned int cipher_type, auth_mask, protocol_flags; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 873 | u_int32_t rand = 0; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 874 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 875 | /* |
| 876 | * Generate check bytes that the client must send back in the user |
| 877 | * packet in order for it to be accepted; this is used to defy ip |
| 878 | * spoofing attacks. Note that this only works against somebody |
| 879 | * doing IP spoofing from a remote machine; any machine on the local |
| 880 | * network can still see outgoing packets and catch the random |
| 881 | * cookie. This only affects rhosts authentication, and this is one |
| 882 | * of the reasons why it is inherently insecure. |
| 883 | */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 884 | for (i = 0; i < 8; i++) { |
| 885 | if (i % 4 == 0) |
| 886 | rand = arc4random(); |
Damien Miller | 396691a | 2000-01-20 22:44:08 +1100 | [diff] [blame] | 887 | cookie[i] = rand & 0xff; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 888 | rand >>= 8; |
| 889 | } |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 890 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 891 | /* |
| 892 | * Send our public key. We include in the packet 64 bits of random |
| 893 | * data that must be matched in the reply in order to prevent IP |
| 894 | * spoofing. |
| 895 | */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 896 | packet_start(SSH_SMSG_PUBLIC_KEY); |
| 897 | for (i = 0; i < 8; i++) |
Damien Miller | 396691a | 2000-01-20 22:44:08 +1100 | [diff] [blame] | 898 | packet_put_char(cookie[i]); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 899 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 900 | /* Store our public server RSA key. */ |
| 901 | packet_put_int(BN_num_bits(public_key->n)); |
| 902 | packet_put_bignum(public_key->e); |
| 903 | packet_put_bignum(public_key->n); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 904 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 905 | /* Store our public host RSA key. */ |
| 906 | packet_put_int(BN_num_bits(sensitive_data.host_key->n)); |
| 907 | packet_put_bignum(sensitive_data.host_key->e); |
| 908 | packet_put_bignum(sensitive_data.host_key->n); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 909 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 910 | /* Put protocol flags. */ |
| 911 | packet_put_int(SSH_PROTOFLAG_HOST_IN_FWD_OPEN); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 912 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 913 | /* Declare which ciphers we support. */ |
| 914 | packet_put_int(cipher_mask()); |
| 915 | |
| 916 | /* Declare supported authentication types. */ |
| 917 | auth_mask = 0; |
| 918 | if (options.rhosts_authentication) |
| 919 | auth_mask |= 1 << SSH_AUTH_RHOSTS; |
| 920 | if (options.rhosts_rsa_authentication) |
| 921 | auth_mask |= 1 << SSH_AUTH_RHOSTS_RSA; |
| 922 | if (options.rsa_authentication) |
| 923 | auth_mask |= 1 << SSH_AUTH_RSA; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 924 | #ifdef KRB4 |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 925 | if (options.kerberos_authentication) |
| 926 | auth_mask |= 1 << SSH_AUTH_KERBEROS; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 927 | #endif |
| 928 | #ifdef AFS |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 929 | if (options.kerberos_tgt_passing) |
| 930 | auth_mask |= 1 << SSH_PASS_KERBEROS_TGT; |
| 931 | if (options.afs_token_passing) |
| 932 | auth_mask |= 1 << SSH_PASS_AFS_TOKEN; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 933 | #endif |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 934 | #ifdef SKEY |
| 935 | if (options.skey_authentication == 1) |
| 936 | auth_mask |= 1 << SSH_AUTH_TIS; |
| 937 | #endif |
| 938 | if (options.password_authentication) |
| 939 | auth_mask |= 1 << SSH_AUTH_PASSWORD; |
| 940 | packet_put_int(auth_mask); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 941 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 942 | /* Send the packet and wait for it to be sent. */ |
| 943 | packet_send(); |
| 944 | packet_write_wait(); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 945 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 946 | debug("Sent %d bit public key and %d bit host key.", |
| 947 | BN_num_bits(public_key->n), BN_num_bits(sensitive_data.host_key->n)); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 948 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 949 | /* Read clients reply (cipher type and session key). */ |
| 950 | packet_read_expect(&plen, SSH_CMSG_SESSION_KEY); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 951 | |
Damien Miller | 50945fa | 1999-12-09 10:31:37 +1100 | [diff] [blame] | 952 | /* Get cipher type and check whether we accept this. */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 953 | cipher_type = packet_get_char(); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 954 | |
Damien Miller | 50945fa | 1999-12-09 10:31:37 +1100 | [diff] [blame] | 955 | if (!(cipher_mask() & (1 << cipher_type))) |
| 956 | packet_disconnect("Warning: client selects unsupported cipher."); |
| 957 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 958 | /* Get check bytes from the packet. These must match those we |
| 959 | sent earlier with the public key packet. */ |
| 960 | for (i = 0; i < 8; i++) |
Damien Miller | 396691a | 2000-01-20 22:44:08 +1100 | [diff] [blame] | 961 | if (cookie[i] != packet_get_char()) |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 962 | packet_disconnect("IP Spoofing check bytes do not match."); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 963 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 964 | debug("Encryption type: %.200s", cipher_name(cipher_type)); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 965 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 966 | /* Get the encrypted integer. */ |
| 967 | session_key_int = BN_new(); |
| 968 | packet_get_bignum(session_key_int, &slen); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 969 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 970 | protocol_flags = packet_get_int(); |
| 971 | packet_set_protocol_flags(protocol_flags); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 972 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 973 | packet_integrity_check(plen, 1 + 8 + slen + 4, SSH_CMSG_SESSION_KEY); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 974 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 975 | /* |
| 976 | * Decrypt it using our private server key and private host key (key |
| 977 | * with larger modulus first). |
| 978 | */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 979 | if (BN_cmp(sensitive_data.private_key->n, sensitive_data.host_key->n) > 0) { |
| 980 | /* Private key has bigger modulus. */ |
| 981 | if (BN_num_bits(sensitive_data.private_key->n) < |
| 982 | BN_num_bits(sensitive_data.host_key->n) + SSH_KEY_BITS_RESERVED) { |
| 983 | fatal("do_connection: %s: private_key %d < host_key %d + SSH_KEY_BITS_RESERVED %d", |
| 984 | get_remote_ipaddr(), |
| 985 | BN_num_bits(sensitive_data.private_key->n), |
| 986 | BN_num_bits(sensitive_data.host_key->n), |
| 987 | SSH_KEY_BITS_RESERVED); |
| 988 | } |
| 989 | rsa_private_decrypt(session_key_int, session_key_int, |
| 990 | sensitive_data.private_key); |
| 991 | rsa_private_decrypt(session_key_int, session_key_int, |
| 992 | sensitive_data.host_key); |
| 993 | } else { |
| 994 | /* Host key has bigger modulus (or they are equal). */ |
| 995 | if (BN_num_bits(sensitive_data.host_key->n) < |
| 996 | BN_num_bits(sensitive_data.private_key->n) + SSH_KEY_BITS_RESERVED) { |
| 997 | fatal("do_connection: %s: host_key %d < private_key %d + SSH_KEY_BITS_RESERVED %d", |
| 998 | get_remote_ipaddr(), |
| 999 | BN_num_bits(sensitive_data.host_key->n), |
| 1000 | BN_num_bits(sensitive_data.private_key->n), |
| 1001 | SSH_KEY_BITS_RESERVED); |
| 1002 | } |
| 1003 | rsa_private_decrypt(session_key_int, session_key_int, |
| 1004 | sensitive_data.host_key); |
| 1005 | rsa_private_decrypt(session_key_int, session_key_int, |
| 1006 | sensitive_data.private_key); |
| 1007 | } |
Damien Miller | 356a0b0 | 1999-11-08 15:30:59 +1100 | [diff] [blame] | 1008 | |
Damien Miller | 396691a | 2000-01-20 22:44:08 +1100 | [diff] [blame] | 1009 | compute_session_id(session_id, cookie, |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1010 | sensitive_data.host_key->n, |
| 1011 | sensitive_data.private_key->n); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1012 | |
Damien Miller | 396691a | 2000-01-20 22:44:08 +1100 | [diff] [blame] | 1013 | /* Destroy the private and public keys. They will no longer be needed. */ |
| 1014 | RSA_free(public_key); |
| 1015 | RSA_free(sensitive_data.private_key); |
| 1016 | RSA_free(sensitive_data.host_key); |
| 1017 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 1018 | /* |
| 1019 | * Extract session key from the decrypted integer. The key is in the |
| 1020 | * least significant 256 bits of the integer; the first byte of the |
| 1021 | * key is in the highest bits. |
| 1022 | */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1023 | BN_mask_bits(session_key_int, sizeof(session_key) * 8); |
| 1024 | len = BN_num_bytes(session_key_int); |
| 1025 | if (len < 0 || len > sizeof(session_key)) |
| 1026 | fatal("do_connection: bad len from %s: session_key_int %d > sizeof(session_key) %d", |
| 1027 | get_remote_ipaddr(), |
| 1028 | len, sizeof(session_key)); |
| 1029 | memset(session_key, 0, sizeof(session_key)); |
| 1030 | BN_bn2bin(session_key_int, session_key + sizeof(session_key) - len); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1031 | |
Damien Miller | 396691a | 2000-01-20 22:44:08 +1100 | [diff] [blame] | 1032 | /* Destroy the decrypted integer. It is no longer needed. */ |
| 1033 | BN_clear_free(session_key_int); |
| 1034 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1035 | /* Xor the first 16 bytes of the session key with the session id. */ |
| 1036 | for (i = 0; i < 16; i++) |
| 1037 | session_key[i] ^= session_id[i]; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1038 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1039 | /* Set the session key. From this on all communications will be encrypted. */ |
| 1040 | packet_set_encryption_key(session_key, SSH_SESSION_KEY_LENGTH, cipher_type); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1041 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1042 | /* Destroy our copy of the session key. It is no longer needed. */ |
| 1043 | memset(session_key, 0, sizeof(session_key)); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1044 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1045 | debug("Received session key; encryption turned on."); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1046 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 1047 | /* Send an acknowledgement packet. Note that this packet is sent encrypted. */ |
| 1048 | packet_start(SSH_SMSG_SUCCESS); |
| 1049 | packet_send(); |
| 1050 | packet_write_wait(); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 1051 | } |