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 | * |
| 3 | * ssh.h |
| 4 | * |
| 5 | * Author: Tatu Ylonen <ylo@cs.hut.fi> |
| 6 | * |
| 7 | * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland |
| 8 | * All rights reserved |
| 9 | * |
| 10 | * Created: Fri Mar 17 17:09:37 1995 ylo |
| 11 | * |
| 12 | * Generic header file for ssh. |
| 13 | * |
| 14 | */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 15 | |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 16 | /* RCSID("$Id: ssh.h,v 1.24 2000/01/14 04:45:52 damien Exp $"); */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 17 | |
| 18 | #ifndef SSH_H |
| 19 | #define SSH_H |
| 20 | |
Damien Miller | ab18c41 | 1999-11-11 10:40:23 +1100 | [diff] [blame] | 21 | #include <netinet/in.h> /* For struct sockaddr_in */ |
| 22 | #include <pwd.h> /* For struct pw */ |
Damien Miller | 5ce662a | 1999-11-11 17:57:39 +1100 | [diff] [blame] | 23 | #include <stdarg.h> /* For va_list */ |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 24 | #include <sys/socket.h> /* For struct sockaddr_storage */ |
| 25 | #include "fake-socket.h" /* For struct sockaddr_storage */ |
Damien Miller | 365199d | 1999-12-22 00:12:38 +1100 | [diff] [blame] | 26 | #ifdef HAVE_SYS_SELECT_H |
| 27 | # include <sys/select.h> |
| 28 | #endif |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 29 | #include "rsa.h" |
| 30 | #include "cipher.h" |
| 31 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 32 | /* |
| 33 | * The default cipher used if IDEA is not supported by the remote host. It is |
| 34 | * recommended that this be one of the mandatory ciphers (DES, 3DES), though |
| 35 | * that is not required. |
| 36 | */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 37 | #define SSH_FALLBACK_CIPHER SSH_CIPHER_3DES |
| 38 | |
| 39 | /* Cipher used for encrypting authentication files. */ |
| 40 | #define SSH_AUTHFILE_CIPHER SSH_CIPHER_3DES |
| 41 | |
| 42 | /* Default port number. */ |
| 43 | #define SSH_DEFAULT_PORT 22 |
| 44 | |
| 45 | /* Maximum number of TCP/IP ports forwarded per direction. */ |
| 46 | #define SSH_MAX_FORWARDS_PER_DIRECTION 100 |
| 47 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 48 | /* |
| 49 | * Maximum number of RSA authentication identity files that can be specified |
| 50 | * in configuration files or on the command line. |
| 51 | */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 52 | #define SSH_MAX_IDENTITY_FILES 100 |
| 53 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 54 | /* |
| 55 | * Major protocol version. Different version indicates major incompatiblity |
| 56 | * that prevents communication. |
| 57 | */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 58 | #define PROTOCOL_MAJOR 1 |
| 59 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 60 | /* |
| 61 | * Minor protocol version. Different version indicates minor incompatibility |
| 62 | * that does not prevent interoperation. |
| 63 | */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 64 | #define PROTOCOL_MINOR 5 |
| 65 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 66 | /* |
| 67 | * Name for the service. The port named by this service overrides the |
| 68 | * default port if present. |
| 69 | */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 70 | #define SSH_SERVICE_NAME "ssh" |
| 71 | |
| 72 | #ifndef ETCDIR |
| 73 | #define ETCDIR "/etc" |
| 74 | #endif /* ETCDIR */ |
| 75 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 76 | #ifndef PIDDIR |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 77 | #define PIDDIR "/var/run" |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 78 | #endif /* PIDDIR */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 79 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 80 | /* |
| 81 | * System-wide file containing host keys of known hosts. This file should be |
| 82 | * world-readable. |
| 83 | */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 84 | #define SSH_SYSTEM_HOSTFILE ETCDIR "/ssh_known_hosts" |
| 85 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 86 | /* |
| 87 | * Of these, ssh_host_key must be readable only by root, whereas ssh_config |
| 88 | * should be world-readable. |
| 89 | */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 90 | #define HOST_KEY_FILE ETCDIR "/ssh_host_key" |
| 91 | #define SERVER_CONFIG_FILE ETCDIR "/sshd_config" |
| 92 | #define HOST_CONFIG_FILE ETCDIR "/ssh_config" |
| 93 | |
Damien Miller | 356a0b0 | 1999-11-08 15:30:59 +1100 | [diff] [blame] | 94 | #ifndef SSH_PROGRAM |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 95 | #define SSH_PROGRAM "/usr/bin/ssh" |
Damien Miller | 356a0b0 | 1999-11-08 15:30:59 +1100 | [diff] [blame] | 96 | #endif /* SSH_PROGRAM */ |
| 97 | |
| 98 | #ifndef LOGIN_PROGRAM |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 99 | #define LOGIN_PROGRAM "/usr/bin/login" |
Damien Miller | 356a0b0 | 1999-11-08 15:30:59 +1100 | [diff] [blame] | 100 | #endif /* LOGIN_PROGRAM */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 101 | |
Damien Miller | c7b38ce | 1999-11-09 10:28:04 +1100 | [diff] [blame] | 102 | #ifndef ASKPASS_PROGRAM |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 103 | #define ASKPASS_PROGRAM "/usr/lib/ssh/ssh-askpass" |
Damien Miller | c7b38ce | 1999-11-09 10:28:04 +1100 | [diff] [blame] | 104 | #endif /* ASKPASS_PROGRAM */ |
| 105 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 106 | /* |
| 107 | * The process id of the daemon listening for connections is saved here to |
| 108 | * make it easier to kill the correct daemon when necessary. |
| 109 | */ |
Damien Miller | a37010e | 1999-10-29 09:18:29 +1000 | [diff] [blame] | 110 | #define SSH_DAEMON_PID_FILE PIDDIR "/sshd.pid" |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 111 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 112 | /* |
| 113 | * The directory in user\'s home directory in which the files reside. The |
| 114 | * directory should be world-readable (though not all files are). |
| 115 | */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 116 | #define SSH_USER_DIR ".ssh" |
| 117 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 118 | /* |
| 119 | * Per-user file containing host keys of known hosts. This file need not be |
| 120 | * readable by anyone except the user him/herself, though this does not |
| 121 | * contain anything particularly secret. |
| 122 | */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 123 | #define SSH_USER_HOSTFILE "~/.ssh/known_hosts" |
| 124 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 125 | /* |
| 126 | * Name of the default file containing client-side authentication key. This |
| 127 | * file should only be readable by the user him/herself. |
| 128 | */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 129 | #define SSH_CLIENT_IDENTITY ".ssh/identity" |
| 130 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 131 | /* |
| 132 | * Configuration file in user\'s home directory. This file need not be |
| 133 | * readable by anyone but the user him/herself, but does not contain anything |
| 134 | * particularly secret. If the user\'s home directory resides on an NFS |
| 135 | * volume where root is mapped to nobody, this may need to be world-readable. |
| 136 | */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 137 | #define SSH_USER_CONFFILE ".ssh/config" |
| 138 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 139 | /* |
| 140 | * File containing a list of those rsa keys that permit logging in as this |
| 141 | * user. This file need not be readable by anyone but the user him/herself, |
| 142 | * but does not contain anything particularly secret. If the user\'s home |
| 143 | * directory resides on an NFS volume where root is mapped to nobody, this |
| 144 | * may need to be world-readable. (This file is read by the daemon which is |
| 145 | * running as root.) |
| 146 | */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 147 | #define SSH_USER_PERMITTED_KEYS ".ssh/authorized_keys" |
| 148 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 149 | /* |
| 150 | * Per-user and system-wide ssh "rc" files. These files are executed with |
| 151 | * /bin/sh before starting the shell or command if they exist. They will be |
| 152 | * passed "proto cookie" as arguments if X11 forwarding with spoofing is in |
| 153 | * use. xauth will be run if neither of these exists. |
| 154 | */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 155 | #define SSH_USER_RC ".ssh/rc" |
| 156 | #define SSH_SYSTEM_RC ETCDIR "/sshrc" |
| 157 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 158 | /* |
| 159 | * Ssh-only version of /etc/hosts.equiv. Additionally, the daemon may use |
| 160 | * ~/.rhosts and /etc/hosts.equiv if rhosts authentication is enabled. |
| 161 | */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 162 | #define SSH_HOSTS_EQUIV ETCDIR "/shosts.equiv" |
| 163 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 164 | /* |
| 165 | * Name of the environment variable containing the pathname of the |
| 166 | * authentication socket. |
| 167 | */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 168 | #define SSH_AUTHSOCKET_ENV_NAME "SSH_AUTH_SOCK" |
| 169 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 170 | /* |
| 171 | * Name of the environment variable containing the pathname of the |
| 172 | * authentication socket. |
| 173 | */ |
Damien Miller | 3226509 | 1999-11-12 11:33:04 +1100 | [diff] [blame] | 174 | #define SSH_AGENTPID_ENV_NAME "SSH_AGENT_PID" |
Damien Miller | 5eeedae | 1999-10-29 10:21:15 +1000 | [diff] [blame] | 175 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 176 | /* |
Damien Miller | aae6c61 | 1999-12-06 11:47:28 +1100 | [diff] [blame] | 177 | * Default path to ssh-askpass used by ssh-add, |
| 178 | * environment variable for overwriting the default location |
| 179 | */ |
Damien Miller | 3bc14dd | 1999-12-07 14:54:53 +1100 | [diff] [blame] | 180 | #ifndef SSH_ASKPASS_DEFAULT |
| 181 | # define SSH_ASKPASS_DEFAULT "/usr/X11R6/bin/ssh-askpass" |
| 182 | #endif |
Damien Miller | aae6c61 | 1999-12-06 11:47:28 +1100 | [diff] [blame] | 183 | #define SSH_ASKPASS_ENV "SSH_ASKPASS" |
| 184 | |
| 185 | /* |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 186 | * Force host key length and server key length to differ by at least this |
| 187 | * many bits. This is to make double encryption with rsaref work. |
| 188 | */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 189 | #define SSH_KEY_BITS_RESERVED 128 |
| 190 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 191 | /* |
| 192 | * Length of the session key in bytes. (Specified as 256 bits in the |
| 193 | * protocol.) |
| 194 | */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 195 | #define SSH_SESSION_KEY_LENGTH 32 |
| 196 | |
| 197 | /* Name of Kerberos service for SSH to use. */ |
| 198 | #define KRB4_SERVICE_NAME "rcmd" |
| 199 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 200 | /* |
| 201 | * Authentication methods. New types can be added, but old types should not |
| 202 | * be removed for compatibility. The maximum allowed value is 31. |
| 203 | */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 204 | #define SSH_AUTH_RHOSTS 1 |
| 205 | #define SSH_AUTH_RSA 2 |
| 206 | #define SSH_AUTH_PASSWORD 3 |
| 207 | #define SSH_AUTH_RHOSTS_RSA 4 |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 208 | #define SSH_AUTH_TIS 5 |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 209 | #define SSH_AUTH_KERBEROS 6 |
| 210 | #define SSH_PASS_KERBEROS_TGT 7 |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 211 | /* 8 to 15 are reserved */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 212 | #define SSH_PASS_AFS_TOKEN 21 |
| 213 | |
| 214 | /* Protocol flags. These are bit masks. */ |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 215 | #define SSH_PROTOFLAG_SCREEN_NUMBER 1 /* X11 forwarding includes screen */ |
| 216 | #define SSH_PROTOFLAG_HOST_IN_FWD_OPEN 2 /* forwarding opens contain host */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 217 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 218 | /* |
| 219 | * Definition of message types. New values can be added, but old values |
| 220 | * should not be removed or without careful consideration of the consequences |
| 221 | * for compatibility. The maximum value is 254; value 255 is reserved for |
| 222 | * future extension. |
| 223 | */ |
| 224 | /* Message name */ /* msg code */ /* arguments */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 225 | #define SSH_MSG_NONE 0 /* no message */ |
| 226 | #define SSH_MSG_DISCONNECT 1 /* cause (string) */ |
| 227 | #define SSH_SMSG_PUBLIC_KEY 2 /* ck,msk,srvk,hostk */ |
| 228 | #define SSH_CMSG_SESSION_KEY 3 /* key (BIGNUM) */ |
| 229 | #define SSH_CMSG_USER 4 /* user (string) */ |
| 230 | #define SSH_CMSG_AUTH_RHOSTS 5 /* user (string) */ |
| 231 | #define SSH_CMSG_AUTH_RSA 6 /* modulus (BIGNUM) */ |
| 232 | #define SSH_SMSG_AUTH_RSA_CHALLENGE 7 /* int (BIGNUM) */ |
| 233 | #define SSH_CMSG_AUTH_RSA_RESPONSE 8 /* int (BIGNUM) */ |
| 234 | #define SSH_CMSG_AUTH_PASSWORD 9 /* pass (string) */ |
| 235 | #define SSH_CMSG_REQUEST_PTY 10 /* TERM, tty modes */ |
| 236 | #define SSH_CMSG_WINDOW_SIZE 11 /* row,col,xpix,ypix */ |
| 237 | #define SSH_CMSG_EXEC_SHELL 12 /* */ |
| 238 | #define SSH_CMSG_EXEC_CMD 13 /* cmd (string) */ |
| 239 | #define SSH_SMSG_SUCCESS 14 /* */ |
| 240 | #define SSH_SMSG_FAILURE 15 /* */ |
| 241 | #define SSH_CMSG_STDIN_DATA 16 /* data (string) */ |
| 242 | #define SSH_SMSG_STDOUT_DATA 17 /* data (string) */ |
| 243 | #define SSH_SMSG_STDERR_DATA 18 /* data (string) */ |
| 244 | #define SSH_CMSG_EOF 19 /* */ |
| 245 | #define SSH_SMSG_EXITSTATUS 20 /* status (int) */ |
| 246 | #define SSH_MSG_CHANNEL_OPEN_CONFIRMATION 21 /* channel (int) */ |
| 247 | #define SSH_MSG_CHANNEL_OPEN_FAILURE 22 /* channel (int) */ |
| 248 | #define SSH_MSG_CHANNEL_DATA 23 /* ch,data (int,str) */ |
| 249 | #define SSH_MSG_CHANNEL_CLOSE 24 /* channel (int) */ |
| 250 | #define SSH_MSG_CHANNEL_CLOSE_CONFIRMATION 25 /* channel (int) */ |
| 251 | /* SSH_CMSG_X11_REQUEST_FORWARDING 26 OBSOLETE */ |
| 252 | #define SSH_SMSG_X11_OPEN 27 /* channel (int) */ |
| 253 | #define SSH_CMSG_PORT_FORWARD_REQUEST 28 /* p,host,hp (i,s,i) */ |
| 254 | #define SSH_MSG_PORT_OPEN 29 /* ch,h,p (i,s,i) */ |
| 255 | #define SSH_CMSG_AGENT_REQUEST_FORWARDING 30 /* */ |
| 256 | #define SSH_SMSG_AGENT_OPEN 31 /* port (int) */ |
| 257 | #define SSH_MSG_IGNORE 32 /* string */ |
| 258 | #define SSH_CMSG_EXIT_CONFIRMATION 33 /* */ |
| 259 | #define SSH_CMSG_X11_REQUEST_FORWARDING 34 /* proto,data (s,s) */ |
| 260 | #define SSH_CMSG_AUTH_RHOSTS_RSA 35 /* user,mod (s,mpi) */ |
| 261 | #define SSH_MSG_DEBUG 36 /* string */ |
| 262 | #define SSH_CMSG_REQUEST_COMPRESSION 37 /* level 1-9 (int) */ |
| 263 | #define SSH_CMSG_MAX_PACKET_SIZE 38 /* size 4k-1024k (int) */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 264 | #define SSH_CMSG_AUTH_TIS 39 /* we use this for s/key */ |
| 265 | #define SSH_SMSG_AUTH_TIS_CHALLENGE 40 /* challenge (string) */ |
| 266 | #define SSH_CMSG_AUTH_TIS_RESPONSE 41 /* response (string) */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 267 | #define SSH_CMSG_AUTH_KERBEROS 42 /* (KTEXT) */ |
| 268 | #define SSH_SMSG_AUTH_KERBEROS_RESPONSE 43 /* (KTEXT) */ |
| 269 | #define SSH_CMSG_HAVE_KERBEROS_TGT 44 /* credentials (s) */ |
| 270 | #define SSH_CMSG_HAVE_AFS_TOKEN 65 /* token (s) */ |
| 271 | |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 272 | /*------------ definitions for login.c -------------*/ |
| 273 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 274 | /* |
| 275 | * Returns the time when the user last logged in. Returns 0 if the |
| 276 | * information is not available. This must be called before record_login. |
| 277 | * The host from which the user logged in is stored in buf. |
| 278 | */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 279 | unsigned long |
| 280 | get_last_login_time(uid_t uid, const char *logname, |
| 281 | char *buf, unsigned int bufsize); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 282 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 283 | /* |
| 284 | * Records that the user has logged in. This does many things normally done |
| 285 | * by login(1). |
| 286 | */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 287 | void |
| 288 | record_login(int pid, const char *ttyname, const char *user, uid_t uid, |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 289 | const char *host, struct sockaddr *addr); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 290 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 291 | /* |
| 292 | * Records that the user has logged out. This does many thigs normally done |
| 293 | * by login(1) or init. |
| 294 | */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 295 | void record_logout(int pid, const char *ttyname); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 296 | |
| 297 | /*------------ definitions for sshconnect.c ----------*/ |
| 298 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 299 | /* |
| 300 | * Opens a TCP/IP connection to the remote server on the given host. If port |
| 301 | * is 0, the default port will be used. If anonymous is zero, a privileged |
| 302 | * port will be allocated to make the connection. This requires super-user |
| 303 | * privileges if anonymous is false. Connection_attempts specifies the |
| 304 | * maximum number of tries, one per second. This returns true on success, |
| 305 | * and zero on failure. If the connection is successful, this calls |
| 306 | * packet_set_connection for the connection. |
| 307 | */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 308 | int |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 309 | ssh_connect(const char *host, struct sockaddr_storage * hostaddr, |
Damien Miller | aae6c61 | 1999-12-06 11:47:28 +1100 | [diff] [blame] | 310 | u_short port, int connection_attempts, |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 311 | int anonymous, uid_t original_real_uid, |
| 312 | const char *proxy_command); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 313 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 314 | /* |
| 315 | * Starts a dialog with the server, and authenticates the current user on the |
| 316 | * server. This does not need any extra privileges. The basic connection to |
| 317 | * the server must already have been established before this is called. If |
| 318 | * login fails, this function prints an error and never returns. This |
| 319 | * initializes the random state, and leaves it initialized (it will also have |
| 320 | * references from the packet module). |
| 321 | */ |
Damien Miller | 5ce662a | 1999-11-11 17:57:39 +1100 | [diff] [blame] | 322 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 323 | void |
| 324 | ssh_login(int host_key_valid, RSA * host_key, const char *host, |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 325 | struct sockaddr * hostaddr, uid_t original_real_uid); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 326 | |
| 327 | /*------------ Definitions for various authentication methods. -------*/ |
| 328 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 329 | /* |
| 330 | * Tries to authenticate the user using the .rhosts file. Returns true if |
| 331 | * authentication succeeds. If ignore_rhosts is non-zero, this will not |
| 332 | * consider .rhosts and .shosts (/etc/hosts.equiv will still be used). |
| 333 | */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 334 | int auth_rhosts(struct passwd * pw, const char *client_user); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 335 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 336 | /* |
| 337 | * Tries to authenticate the user using the .rhosts file and the host using |
| 338 | * its host key. Returns true if authentication succeeds. |
| 339 | */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 340 | int |
| 341 | auth_rhosts_rsa(struct passwd * pw, const char *client_user, |
| 342 | BIGNUM * client_host_key_e, BIGNUM * client_host_key_n); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 343 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 344 | /* |
| 345 | * Tries to authenticate the user using password. Returns true if |
| 346 | * authentication succeeds. |
| 347 | */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 348 | int auth_password(struct passwd * pw, const char *password); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 349 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 350 | /* |
| 351 | * Performs the RSA authentication dialog with the client. This returns 0 if |
| 352 | * the client could not be authenticated, and 1 if authentication was |
| 353 | * successful. This may exit if there is a serious protocol violation. |
| 354 | */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 355 | int auth_rsa(struct passwd * pw, BIGNUM * client_n); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 356 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 357 | /* |
| 358 | * Parses an RSA key (number of bits, e, n) from a string. Moves the pointer |
| 359 | * over the key. Skips any whitespace at the beginning and at end. |
| 360 | */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 361 | int auth_rsa_read_key(char **cpp, unsigned int *bitsp, BIGNUM * e, BIGNUM * n); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 362 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 363 | /* |
| 364 | * Returns the name of the machine at the other end of the socket. The |
| 365 | * returned string should be freed by the caller. |
| 366 | */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 367 | char *get_remote_hostname(int socket); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 368 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 369 | /* |
| 370 | * Return the canonical name of the host in the other side of the current |
| 371 | * connection (as returned by packet_get_connection). The host name is |
| 372 | * cached, so it is efficient to call this several times. |
| 373 | */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 374 | const char *get_canonical_hostname(void); |
| 375 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 376 | /* |
| 377 | * Returns the remote IP address as an ascii string. The value need not be |
| 378 | * freed by the caller. |
| 379 | */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 380 | const char *get_remote_ipaddr(void); |
| 381 | |
| 382 | /* Returns the port number of the peer of the socket. */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 383 | int get_peer_port(int sock); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 384 | |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 385 | /* Returns the port number of the remote/local host. */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 386 | int get_remote_port(void); |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 387 | int get_local_port(void); |
| 388 | |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 389 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 390 | /* |
| 391 | * Tries to match the host name (which must be in all lowercase) against the |
| 392 | * comma-separated sequence of subpatterns (each possibly preceded by ! to |
| 393 | * indicate negation). Returns true if there is a positive match; zero |
| 394 | * otherwise. |
| 395 | */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 396 | int match_hostname(const char *host, const char *pattern, unsigned int len); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 397 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 398 | /* |
| 399 | * Checks whether the given host is already in the list of our known hosts. |
| 400 | * Returns HOST_OK if the host is known and has the specified key, HOST_NEW |
| 401 | * if the host is not known, and HOST_CHANGED if the host is known but used |
| 402 | * to have a different host key. The host must be in all lowercase. |
| 403 | */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 404 | typedef enum { |
| 405 | HOST_OK, HOST_NEW, HOST_CHANGED |
| 406 | } HostStatus; |
| 407 | HostStatus |
| 408 | check_host_in_hostfile(const char *filename, const char *host, |
| 409 | BIGNUM * e, BIGNUM * n, BIGNUM * ke, BIGNUM * kn); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 410 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 411 | /* |
| 412 | * Appends an entry to the host file. Returns false if the entry could not |
| 413 | * be appended. |
| 414 | */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 415 | int |
| 416 | add_host_to_hostfile(const char *filename, const char *host, |
| 417 | BIGNUM * e, BIGNUM * n); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 418 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 419 | /* |
| 420 | * Performs the RSA authentication challenge-response dialog with the client, |
| 421 | * and returns true (non-zero) if the client gave the correct answer to our |
| 422 | * challenge; returns zero if the client gives a wrong answer. |
| 423 | */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 424 | int auth_rsa_challenge_dialog(BIGNUM * e, BIGNUM * n); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 425 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 426 | /* |
| 427 | * Reads a passphrase from /dev/tty with echo turned off. Returns the |
| 428 | * passphrase (allocated with xmalloc). Exits if EOF is encountered. If |
| 429 | * from_stdin is true, the passphrase will be read from stdin instead. |
| 430 | */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 431 | char *read_passphrase(const char *prompt, int from_stdin); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 432 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 433 | /* |
| 434 | * Saves the authentication (private) key in a file, encrypting it with |
| 435 | * passphrase. The identification of the file (lowest 64 bits of n) will |
| 436 | * precede the key to provide identification of the key without needing a |
| 437 | * passphrase. |
| 438 | */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 439 | int |
| 440 | save_private_key(const char *filename, const char *passphrase, |
| 441 | RSA * private_key, const char *comment); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 442 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 443 | /* |
| 444 | * Loads the public part of the key file (public key and comment). Returns 0 |
| 445 | * if an error occurred; zero if the public key was successfully read. The |
| 446 | * comment of the key is returned in comment_return if it is non-NULL; the |
| 447 | * caller must free the value with xfree. |
| 448 | */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 449 | int |
| 450 | load_public_key(const char *filename, RSA * pub, |
| 451 | char **comment_return); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 452 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 453 | /* |
| 454 | * Loads the private key from the file. Returns 0 if an error is encountered |
| 455 | * (file does not exist or is not readable, or passphrase is bad). This |
| 456 | * initializes the private key. The comment of the key is returned in |
| 457 | * comment_return if it is non-NULL; the caller must free the value with |
| 458 | * xfree. |
| 459 | */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 460 | int |
| 461 | load_private_key(const char *filename, const char *passphrase, |
| 462 | RSA * private_key, char **comment_return); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 463 | |
Damien Miller | 6d7b2cd | 1999-11-12 15:19:27 +1100 | [diff] [blame] | 464 | /*------------ Definitions for logging. -----------------------*/ |
| 465 | |
| 466 | /* Supported syslog facilities and levels. */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 467 | typedef enum { |
| 468 | SYSLOG_FACILITY_DAEMON, |
| 469 | SYSLOG_FACILITY_USER, |
| 470 | SYSLOG_FACILITY_AUTH, |
| 471 | SYSLOG_FACILITY_LOCAL0, |
| 472 | SYSLOG_FACILITY_LOCAL1, |
| 473 | SYSLOG_FACILITY_LOCAL2, |
| 474 | SYSLOG_FACILITY_LOCAL3, |
| 475 | SYSLOG_FACILITY_LOCAL4, |
| 476 | SYSLOG_FACILITY_LOCAL5, |
| 477 | SYSLOG_FACILITY_LOCAL6, |
| 478 | SYSLOG_FACILITY_LOCAL7 |
| 479 | } SyslogFacility; |
Damien Miller | 6d7b2cd | 1999-11-12 15:19:27 +1100 | [diff] [blame] | 480 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 481 | typedef enum { |
| 482 | SYSLOG_LEVEL_QUIET, |
| 483 | SYSLOG_LEVEL_FATAL, |
| 484 | SYSLOG_LEVEL_ERROR, |
| 485 | SYSLOG_LEVEL_INFO, |
| 486 | SYSLOG_LEVEL_VERBOSE, |
| 487 | SYSLOG_LEVEL_DEBUG |
| 488 | } LogLevel; |
Damien Miller | 6d7b2cd | 1999-11-12 15:19:27 +1100 | [diff] [blame] | 489 | /* Initializes logging. */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 490 | void log_init(char *av0, LogLevel level, SyslogFacility facility, int on_stderr); |
Damien Miller | 6d7b2cd | 1999-11-12 15:19:27 +1100 | [diff] [blame] | 491 | |
| 492 | /* Logging implementation, depending on server or client */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 493 | void do_log(LogLevel level, const char *fmt, va_list args); |
Damien Miller | 6d7b2cd | 1999-11-12 15:19:27 +1100 | [diff] [blame] | 494 | |
Damien Miller | 6162d12 | 1999-11-21 13:23:52 +1100 | [diff] [blame] | 495 | /* name to facility/level */ |
| 496 | SyslogFacility log_facility_number(char *name); |
| 497 | LogLevel log_level_number(char *name); |
| 498 | |
Damien Miller | 6d7b2cd | 1999-11-12 15:19:27 +1100 | [diff] [blame] | 499 | /* Output a message to syslog or stderr */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 500 | void fatal(const char *fmt,...) __attribute__((format(printf, 1, 2))); |
| 501 | void error(const char *fmt,...) __attribute__((format(printf, 1, 2))); |
| 502 | void log(const char *fmt,...) __attribute__((format(printf, 1, 2))); |
| 503 | void verbose(const char *fmt,...) __attribute__((format(printf, 1, 2))); |
| 504 | void debug(const char *fmt,...) __attribute__((format(printf, 1, 2))); |
Damien Miller | 6d7b2cd | 1999-11-12 15:19:27 +1100 | [diff] [blame] | 505 | |
| 506 | /* same as fatal() but w/o logging */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 507 | void fatal_cleanup(void); |
Damien Miller | 6d7b2cd | 1999-11-12 15:19:27 +1100 | [diff] [blame] | 508 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 509 | /* |
| 510 | * Registers a cleanup function to be called by fatal()/fatal_cleanup() |
| 511 | * before exiting. It is permissible to call fatal_remove_cleanup for the |
| 512 | * function itself from the function. |
| 513 | */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 514 | void fatal_add_cleanup(void (*proc) (void *context), void *context); |
Damien Miller | 6d7b2cd | 1999-11-12 15:19:27 +1100 | [diff] [blame] | 515 | |
| 516 | /* Removes a cleanup function to be called at fatal(). */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 517 | void fatal_remove_cleanup(void (*proc) (void *context), void *context); |
Damien Miller | 6d7b2cd | 1999-11-12 15:19:27 +1100 | [diff] [blame] | 518 | |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 519 | /*---------------- definitions for channels ------------------*/ |
| 520 | |
| 521 | /* Sets specific protocol options. */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 522 | void channel_set_options(int hostname_in_open); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 523 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 524 | /* |
| 525 | * Allocate a new channel object and set its type and socket. Remote_name |
| 526 | * must have been allocated with xmalloc; this will free it when the channel |
| 527 | * is freed. |
| 528 | */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 529 | int channel_allocate(int type, int sock, char *remote_name); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 530 | |
| 531 | /* Free the channel and close its socket. */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 532 | void channel_free(int channel); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 533 | |
| 534 | /* Add any bits relevant to channels in select bitmasks. */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 535 | void channel_prepare_select(fd_set * readset, fd_set * writeset); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 536 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 537 | /* |
| 538 | * After select, perform any appropriate operations for channels which have |
| 539 | * events pending. |
| 540 | */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 541 | void channel_after_select(fd_set * readset, fd_set * writeset); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 542 | |
| 543 | /* If there is data to send to the connection, send some of it now. */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 544 | void channel_output_poll(void); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 545 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 546 | /* |
| 547 | * This is called when a packet of type CHANNEL_DATA has just been received. |
| 548 | * The message type has already been consumed, but channel number and data is |
| 549 | * still there. |
| 550 | */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 551 | void channel_input_data(int payload_len); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 552 | |
| 553 | /* Returns true if no channel has too much buffered data. */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 554 | int channel_not_very_much_buffered_data(void); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 555 | |
| 556 | /* This is called after receiving CHANNEL_CLOSE. */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 557 | void channel_input_close(void); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 558 | |
| 559 | /* This is called after receiving CHANNEL_CLOSE_CONFIRMATION. */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 560 | void channel_input_close_confirmation(void); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 561 | |
| 562 | /* This is called after receiving CHANNEL_OPEN_CONFIRMATION. */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 563 | void channel_input_open_confirmation(void); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 564 | |
| 565 | /* This is called after receiving CHANNEL_OPEN_FAILURE from the other side. */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 566 | void channel_input_open_failure(void); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 567 | |
| 568 | /* This closes any sockets that are listening for connections; this removes |
| 569 | any unix domain sockets. */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 570 | void channel_stop_listening(void); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 571 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 572 | /* |
| 573 | * Closes the sockets of all channels. This is used to close extra file |
| 574 | * descriptors after a fork. |
| 575 | */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 576 | void channel_close_all(void); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 577 | |
| 578 | /* Returns the maximum file descriptor number used by the channels. */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 579 | int channel_max_fd(void); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 580 | |
| 581 | /* Returns true if there is still an open channel over the connection. */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 582 | int channel_still_open(void); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 583 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 584 | /* |
| 585 | * Returns a string containing a list of all open channels. The list is |
| 586 | * suitable for displaying to the user. It uses crlf instead of newlines. |
| 587 | * The caller should free the string with xfree. |
| 588 | */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 589 | char *channel_open_message(void); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 590 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 591 | /* |
| 592 | * Initiate forwarding of connections to local port "port" through the secure |
| 593 | * channel to host:port from remote side. This never returns if there was an |
| 594 | * error. |
| 595 | */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 596 | void |
Damien Miller | aae6c61 | 1999-12-06 11:47:28 +1100 | [diff] [blame] | 597 | channel_request_local_forwarding(u_short port, const char *host, |
Damien Miller | a34a28b | 1999-12-14 10:47:15 +1100 | [diff] [blame] | 598 | u_short remote_port, int gateway_ports); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 599 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 600 | /* |
| 601 | * Initiate forwarding of connections to port "port" on remote host through |
| 602 | * the secure channel to host:port from local side. This never returns if |
| 603 | * there was an error. This registers that open requests for that port are |
| 604 | * permitted. |
| 605 | */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 606 | void |
Damien Miller | aae6c61 | 1999-12-06 11:47:28 +1100 | [diff] [blame] | 607 | channel_request_remote_forwarding(u_short port, const char *host, |
| 608 | u_short remote_port); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 609 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 610 | /* |
| 611 | * Permits opening to any host/port in SSH_MSG_PORT_OPEN. This is usually |
| 612 | * called by the server, because the user could connect to any port anyway, |
| 613 | * and the server has no way to know but to trust the client anyway. |
| 614 | */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 615 | void channel_permit_all_opens(void); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 616 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 617 | /* |
| 618 | * This is called after receiving CHANNEL_FORWARDING_REQUEST. This initates |
| 619 | * listening for the port, and sends back a success reply (or disconnect |
| 620 | * message if there was an error). This never returns if there was an error. |
| 621 | */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 622 | void channel_input_port_forward_request(int is_root); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 623 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 624 | /* |
| 625 | * This is called after receiving PORT_OPEN message. This attempts to |
| 626 | * connect to the given host:port, and sends back CHANNEL_OPEN_CONFIRMATION |
| 627 | * or CHANNEL_OPEN_FAILURE. |
| 628 | */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 629 | void channel_input_port_open(int payload_len); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 630 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 631 | /* |
| 632 | * Creates a port for X11 connections, and starts listening for it. Returns |
| 633 | * the display name, or NULL if an error was encountered. |
| 634 | */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 635 | char *x11_create_display(int screen); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 636 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 637 | /* |
| 638 | * Creates an internet domain socket for listening for X11 connections. |
| 639 | * Returns a suitable value for the DISPLAY variable, or NULL if an error |
| 640 | * occurs. |
| 641 | */ |
Damien Miller | a34a28b | 1999-12-14 10:47:15 +1100 | [diff] [blame] | 642 | char *x11_create_display_inet(int screen, int x11_display_offset); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 643 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 644 | /* |
| 645 | * This is called when SSH_SMSG_X11_OPEN is received. The packet contains |
| 646 | * the remote channel number. We should do whatever we want, and respond |
| 647 | * with either SSH_MSG_OPEN_CONFIRMATION or SSH_MSG_OPEN_FAILURE. |
| 648 | */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 649 | void x11_input_open(int payload_len); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 650 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 651 | /* |
| 652 | * Requests forwarding of X11 connections. This should be called on the |
| 653 | * client only. |
| 654 | */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 655 | void x11_request_forwarding(void); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 656 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 657 | /* |
| 658 | * Requests forwarding for X11 connections, with authentication spoofing. |
| 659 | * This should be called in the client only. |
| 660 | */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 661 | void x11_request_forwarding_with_spoofing(const char *proto, const char *data); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 662 | |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 663 | /* Sends a message to the server to request authentication fd forwarding. */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 664 | void auth_request_forwarding(void); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 665 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 666 | /* |
| 667 | * Returns the name of the forwarded authentication socket. Returns NULL if |
| 668 | * there is no forwarded authentication socket. The returned value points to |
| 669 | * a static buffer. |
| 670 | */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 671 | char *auth_get_socket_name(void); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 672 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 673 | /* |
| 674 | * This if called to process SSH_CMSG_AGENT_REQUEST_FORWARDING on the server. |
| 675 | * This starts forwarding authentication requests. |
| 676 | */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 677 | void auth_input_request_forwarding(struct passwd * pw); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 678 | |
| 679 | /* This is called to process an SSH_SMSG_AGENT_OPEN message. */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 680 | void auth_input_open_request(void); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 681 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 682 | /* |
| 683 | * Returns true if the given string matches the pattern (which may contain ? |
| 684 | * and * as wildcards), and zero if it does not match. |
| 685 | */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 686 | int match_pattern(const char *s, const char *pattern); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 687 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 688 | /* |
| 689 | * Expands tildes in the file name. Returns data allocated by xmalloc. |
| 690 | * Warning: this calls getpw*. |
| 691 | */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 692 | char *tilde_expand_filename(const char *filename, uid_t my_uid); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 693 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 694 | /* |
| 695 | * Performs the interactive session. This handles data transmission between |
| 696 | * the client and the program. Note that the notion of stdin, stdout, and |
| 697 | * stderr in this function is sort of reversed: this function writes to stdin |
| 698 | * (of the child program), and reads from stdout and stderr (of the child |
| 699 | * program). |
| 700 | */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 701 | void server_loop(int pid, int fdin, int fdout, int fderr); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 702 | |
| 703 | /* Client side main loop for the interactive session. */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 704 | int client_loop(int have_pty, int escape_char); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 705 | |
| 706 | /* Linked list of custom environment strings (see auth-rsa.c). */ |
| 707 | struct envstring { |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 708 | struct envstring *next; |
| 709 | char *s; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 710 | }; |
Damien Miller | 037a0dc | 1999-12-07 15:38:31 +1100 | [diff] [blame] | 711 | |
| 712 | /* |
| 713 | * Ensure all of data on socket comes through. f==read || f==write |
| 714 | */ |
| 715 | int atomicio(int (*f)(), int fd, void *s, size_t n); |
| 716 | |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 717 | #ifdef KRB4 |
| 718 | #include <krb.h> |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 719 | /* |
| 720 | * Performs Kerberos v4 mutual authentication with the client. This returns 0 |
| 721 | * if the client could not be authenticated, and 1 if authentication was |
| 722 | * successful. This may exit if there is a serious protocol violation. |
| 723 | */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 724 | int auth_krb4(const char *server_user, KTEXT auth, char **client); |
| 725 | int krb4_init(uid_t uid); |
| 726 | void krb4_cleanup_proc(void *ignore); |
Damien Miller | aae6c61 | 1999-12-06 11:47:28 +1100 | [diff] [blame] | 727 | int auth_krb4_password(struct passwd * pw, const char *password); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 728 | |
| 729 | #ifdef AFS |
| 730 | #include <kafs.h> |
| 731 | |
| 732 | /* Accept passed Kerberos v4 ticket-granting ticket and AFS tokens. */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 733 | int auth_kerberos_tgt(struct passwd * pw, const char *string); |
| 734 | int auth_afs_token(struct passwd * pw, const char *token_string); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 735 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 736 | int creds_to_radix(CREDENTIALS * creds, unsigned char *buf); |
| 737 | int radix_to_creds(const char *buf, CREDENTIALS * creds); |
| 738 | #endif /* AFS */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 739 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 740 | #endif /* KRB4 */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 741 | |
| 742 | #ifdef SKEY |
| 743 | #include <skey.h> |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 744 | char *skey_fake_keyinfo(char *username); |
Damien Miller | aae6c61 | 1999-12-06 11:47:28 +1100 | [diff] [blame] | 745 | int auth_skey_password(struct passwd * pw, const char *password); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 746 | #endif /* SKEY */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 747 | |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 748 | /* AF_UNSPEC or AF_INET or AF_INET6 */ |
| 749 | extern int IPv4or6; |
| 750 | |
Damien Miller | e72b7af | 1999-12-30 15:08:44 +1100 | [diff] [blame] | 751 | #ifdef USE_PAM |
| 752 | #include "auth-pam.h" |
| 753 | #endif /* USE_PAM */ |
| 754 | |
Damien Miller | 8bdeee2 | 1999-12-30 15:50:54 +1100 | [diff] [blame] | 755 | #ifdef HAVE_DANTE |
| 756 | /* |
| 757 | * The following defines map the normal socket operations to SOCKSified |
| 758 | * versions coming from the Dante SOCKS package. |
| 759 | */ |
| 760 | #define accept Raccept |
| 761 | #define bind Rbind |
| 762 | #define bindresvport Rbindresvport |
| 763 | #define connect Rconnect |
| 764 | #define gethostbyname Rgethostbyname |
| 765 | #define gethostbyname2 Rgethostbyname2 |
| 766 | #define getpeername Rgetpeername |
| 767 | #define getsockname Rgetsockname |
| 768 | #define read Rread |
| 769 | #define readv Rreadv |
| 770 | #define recv Rrecv |
| 771 | #define recvmsg Rrecvmsg |
| 772 | #define recvfrom Rrecvfrom |
| 773 | #define rresvport Rrresvport |
| 774 | #define send Rsend |
| 775 | #define sendmsg Rsendmsg |
| 776 | #define sendto Rsendto |
| 777 | #define write Rwrite |
| 778 | #define writev Rwritev |
| 779 | int Raccept (int, struct sockaddr *, socklen_t *); |
| 780 | int Rbind (int, const struct sockaddr *, socklen_t); |
| 781 | int Rbindresvport(int , struct sockaddr_in *); |
| 782 | int Rconnect (int, const struct sockaddr *, socklen_t); |
| 783 | struct hostent *Rgethostbyname(const char *); |
| 784 | struct hostent *Rgethostbyname2(const char *, int); |
| 785 | int Rgetpeername (int, struct sockaddr *, socklen_t *); |
| 786 | int Rgetsockname (int, struct sockaddr *, socklen_t *); |
| 787 | ssize_t Rread(int , void *, size_t ); |
| 788 | ssize_t Rreadv(int d, const struct iovec *iov, int iovcnt); |
| 789 | ssize_t Rrecv (int, void *, size_t, int); |
| 790 | ssize_t Rrecvfrom (int, void *, size_t, int, struct sockaddr *, |
| 791 | socklen_t *); |
| 792 | ssize_t Rsend (int, const void *, size_t, int); |
| 793 | ssize_t Rsendmsg (int, const struct msghdr *, int); |
| 794 | ssize_t Rsendto (int, const void *, |
| 795 | size_t, int, const struct sockaddr *, socklen_t); |
| 796 | ssize_t Rwrite(int , const void *, size_t ); |
| 797 | ssize_t Rwritev(int , const struct iovec *, int ); |
| 798 | #endif /* HAVE_DANTE */ |
| 799 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 800 | #endif /* SSH_H */ |