Damien Miller | ad833b3 | 2000-08-23 10:46:23 +1000 | [diff] [blame^] | 1 | /* $OpenBSD: ssh-agent.c,v 1.33 2000/08/19 21:34:43 markus Exp $ */ |
Damien Miller | 792c511 | 1999-10-29 09:47:09 +1000 | [diff] [blame] | 2 | |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 3 | /* |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 4 | * Author: Tatu Ylonen <ylo@cs.hut.fi> |
| 5 | * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland |
| 6 | * All rights reserved |
| 7 | * Created: Wed Mar 29 03:46:59 1995 ylo |
| 8 | * The authentication agent program. |
Damien Miller | ad833b3 | 2000-08-23 10:46:23 +1000 | [diff] [blame^] | 9 | * |
| 10 | * SSH2 implementation, |
| 11 | * Copyright (c) 2000 Markus Friedl. All rights reserved. |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 12 | */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 13 | |
| 14 | #include "includes.h" |
Damien Miller | ad833b3 | 2000-08-23 10:46:23 +1000 | [diff] [blame^] | 15 | RCSID("$OpenBSD: ssh-agent.c,v 1.33 2000/08/19 21:34:43 markus Exp $"); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 16 | |
| 17 | #include "ssh.h" |
| 18 | #include "rsa.h" |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 19 | #include "buffer.h" |
| 20 | #include "bufaux.h" |
| 21 | #include "xmalloc.h" |
| 22 | #include "packet.h" |
| 23 | #include "getput.h" |
| 24 | #include "mpaux.h" |
| 25 | |
Damien Miller | ad833b3 | 2000-08-23 10:46:23 +1000 | [diff] [blame^] | 26 | #include <openssl/evp.h> |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 27 | #include <openssl/md5.h> |
Damien Miller | 994cf14 | 2000-07-21 10:19:44 +1000 | [diff] [blame] | 28 | #include <openssl/dsa.h> |
| 29 | #include <openssl/rsa.h> |
| 30 | #include "key.h" |
| 31 | #include "authfd.h" |
Damien Miller | ad833b3 | 2000-08-23 10:46:23 +1000 | [diff] [blame^] | 32 | #include "dsa.h" |
| 33 | #include "kex.h" |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 34 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 35 | typedef struct { |
| 36 | int fd; |
| 37 | enum { |
| 38 | AUTH_UNUSED, AUTH_SOCKET, AUTH_CONNECTION |
| 39 | } type; |
| 40 | Buffer input; |
| 41 | Buffer output; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 42 | } SocketEntry; |
| 43 | |
| 44 | unsigned int sockets_alloc = 0; |
| 45 | SocketEntry *sockets = NULL; |
| 46 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 47 | typedef struct { |
Damien Miller | ad833b3 | 2000-08-23 10:46:23 +1000 | [diff] [blame^] | 48 | Key *key; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 49 | char *comment; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 50 | } Identity; |
| 51 | |
Damien Miller | ad833b3 | 2000-08-23 10:46:23 +1000 | [diff] [blame^] | 52 | typedef struct { |
| 53 | int nentries; |
| 54 | Identity *identities; |
| 55 | } Idtab; |
| 56 | |
| 57 | /* private key table, one per protocol version */ |
| 58 | Idtab idtable[3]; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 59 | |
| 60 | int max_fd = 0; |
| 61 | |
| 62 | /* pid of shell == parent of agent */ |
Damien Miller | 166fca8 | 2000-04-20 07:42:21 +1000 | [diff] [blame] | 63 | pid_t parent_pid = -1; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 64 | |
| 65 | /* pathname and directory for AUTH_SOCKET */ |
| 66 | char socket_name[1024]; |
| 67 | char socket_dir[1024]; |
| 68 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 69 | #ifdef HAVE___PROGNAME |
| 70 | extern char *__progname; |
| 71 | #else /* HAVE___PROGNAME */ |
Damien Miller | 70fb671 | 2000-05-01 20:59:50 +1000 | [diff] [blame] | 72 | static const char *__progname = "ssh-agent"; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 73 | #endif /* HAVE___PROGNAME */ |
| 74 | |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 75 | void |
Damien Miller | ad833b3 | 2000-08-23 10:46:23 +1000 | [diff] [blame^] | 76 | idtab_init(void) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 77 | { |
Damien Miller | ad833b3 | 2000-08-23 10:46:23 +1000 | [diff] [blame^] | 78 | int i; |
| 79 | for (i = 0; i <=2; i++){ |
| 80 | idtable[i].identities = NULL; |
| 81 | idtable[i].nentries = 0; |
| 82 | } |
| 83 | } |
| 84 | |
| 85 | /* return private key table for requested protocol version */ |
| 86 | Idtab * |
| 87 | idtab_lookup(int version) |
| 88 | { |
| 89 | if (version < 1 || version > 2) |
| 90 | fatal("internal error, bad protocol version %d", version); |
| 91 | return &idtable[version]; |
| 92 | } |
| 93 | |
| 94 | /* return matching private key for given public key */ |
| 95 | Key * |
| 96 | lookup_private_key(Key *key, int *idx, int version) |
| 97 | { |
| 98 | int i; |
| 99 | Idtab *tab = idtab_lookup(version); |
| 100 | for (i = 0; i < tab->nentries; i++) { |
| 101 | if (key_equal(key, tab->identities[i].key)) { |
| 102 | if (idx != NULL) |
| 103 | *idx = i; |
| 104 | return tab->identities[i].key; |
| 105 | } |
| 106 | } |
| 107 | return NULL; |
| 108 | } |
| 109 | |
| 110 | /* send list of supported public keys to 'client' */ |
| 111 | void |
| 112 | process_request_identities(SocketEntry *e, int version) |
| 113 | { |
| 114 | Idtab *tab = idtab_lookup(version); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 115 | Buffer msg; |
| 116 | int i; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 117 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 118 | buffer_init(&msg); |
Damien Miller | ad833b3 | 2000-08-23 10:46:23 +1000 | [diff] [blame^] | 119 | buffer_put_char(&msg, (version == 1) ? |
| 120 | SSH_AGENT_RSA_IDENTITIES_ANSWER : SSH2_AGENT_IDENTITIES_ANSWER); |
| 121 | buffer_put_int(&msg, tab->nentries); |
| 122 | for (i = 0; i < tab->nentries; i++) { |
| 123 | Identity *id = &tab->identities[i]; |
| 124 | if (id->key->type == KEY_RSA) { |
| 125 | buffer_put_int(&msg, BN_num_bits(id->key->rsa->n)); |
| 126 | buffer_put_bignum(&msg, id->key->rsa->e); |
| 127 | buffer_put_bignum(&msg, id->key->rsa->n); |
| 128 | } else { |
| 129 | unsigned char *blob; |
| 130 | unsigned int blen; |
| 131 | dsa_make_key_blob(id->key, &blob, &blen); |
| 132 | buffer_put_string(&msg, blob, blen); |
| 133 | xfree(blob); |
| 134 | } |
| 135 | buffer_put_cstring(&msg, id->comment); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 136 | } |
| 137 | buffer_put_int(&e->output, buffer_len(&msg)); |
| 138 | buffer_append(&e->output, buffer_ptr(&msg), buffer_len(&msg)); |
| 139 | buffer_free(&msg); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 140 | } |
| 141 | |
Damien Miller | ad833b3 | 2000-08-23 10:46:23 +1000 | [diff] [blame^] | 142 | /* ssh1 only */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 143 | void |
Damien Miller | ad833b3 | 2000-08-23 10:46:23 +1000 | [diff] [blame^] | 144 | process_authentication_challenge1(SocketEntry *e) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 145 | { |
Damien Miller | ad833b3 | 2000-08-23 10:46:23 +1000 | [diff] [blame^] | 146 | Key *key, *private; |
| 147 | BIGNUM *challenge; |
| 148 | int i, len; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 149 | Buffer msg; |
| 150 | MD5_CTX md; |
| 151 | unsigned char buf[32], mdbuf[16], session_id[16]; |
| 152 | unsigned int response_type; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 153 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 154 | buffer_init(&msg); |
Damien Miller | ad833b3 | 2000-08-23 10:46:23 +1000 | [diff] [blame^] | 155 | key = key_new(KEY_RSA); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 156 | challenge = BN_new(); |
Damien Miller | ad833b3 | 2000-08-23 10:46:23 +1000 | [diff] [blame^] | 157 | |
| 158 | buffer_get_int(&e->input); /* ignored */ |
| 159 | buffer_get_bignum(&e->input, key->rsa->e); |
| 160 | buffer_get_bignum(&e->input, key->rsa->n); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 161 | buffer_get_bignum(&e->input, challenge); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 162 | |
Damien Miller | ad833b3 | 2000-08-23 10:46:23 +1000 | [diff] [blame^] | 163 | /* Only protocol 1.1 is supported */ |
| 164 | if (buffer_len(&e->input) == 0) |
| 165 | goto failure; |
| 166 | buffer_get(&e->input, (char *) session_id, 16); |
| 167 | response_type = buffer_get_int(&e->input); |
| 168 | if (response_type != 1) |
| 169 | goto failure; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 170 | |
Damien Miller | ad833b3 | 2000-08-23 10:46:23 +1000 | [diff] [blame^] | 171 | private = lookup_private_key(key, NULL, 1); |
| 172 | if (private != NULL) { |
| 173 | /* Decrypt the challenge using the private key. */ |
| 174 | rsa_private_decrypt(challenge, challenge, private->rsa); |
Damien Miller | fd7c911 | 1999-11-08 16:15:55 +1100 | [diff] [blame] | 175 | |
Damien Miller | ad833b3 | 2000-08-23 10:46:23 +1000 | [diff] [blame^] | 176 | /* The response is MD5 of decrypted challenge plus session id. */ |
| 177 | len = BN_num_bytes(challenge); |
| 178 | if (len <= 0 || len > 32) { |
| 179 | log("process_authentication_challenge: bad challenge length %d", len); |
| 180 | goto failure; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 181 | } |
Damien Miller | ad833b3 | 2000-08-23 10:46:23 +1000 | [diff] [blame^] | 182 | memset(buf, 0, 32); |
| 183 | BN_bn2bin(challenge, buf + 32 - len); |
| 184 | MD5_Init(&md); |
| 185 | MD5_Update(&md, buf, 32); |
| 186 | MD5_Update(&md, session_id, 16); |
| 187 | MD5_Final(mdbuf, &md); |
| 188 | |
| 189 | /* Send the response. */ |
| 190 | buffer_put_char(&msg, SSH_AGENT_RSA_RESPONSE); |
| 191 | for (i = 0; i < 16; i++) |
| 192 | buffer_put_char(&msg, mdbuf[i]); |
| 193 | goto send; |
| 194 | } |
| 195 | |
| 196 | failure: |
| 197 | /* Unknown identity or protocol error. Send failure. */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 198 | buffer_put_char(&msg, SSH_AGENT_FAILURE); |
| 199 | send: |
| 200 | buffer_put_int(&e->output, buffer_len(&msg)); |
Damien Miller | ad833b3 | 2000-08-23 10:46:23 +1000 | [diff] [blame^] | 201 | buffer_append(&e->output, buffer_ptr(&msg), buffer_len(&msg)); |
| 202 | key_free(key); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 203 | BN_clear_free(challenge); |
Damien Miller | ad833b3 | 2000-08-23 10:46:23 +1000 | [diff] [blame^] | 204 | buffer_free(&msg); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 205 | } |
| 206 | |
Damien Miller | ad833b3 | 2000-08-23 10:46:23 +1000 | [diff] [blame^] | 207 | /* ssh2 only */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 208 | void |
Damien Miller | ad833b3 | 2000-08-23 10:46:23 +1000 | [diff] [blame^] | 209 | process_sign_request2(SocketEntry *e) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 210 | { |
Damien Miller | ad833b3 | 2000-08-23 10:46:23 +1000 | [diff] [blame^] | 211 | extern int datafellows; |
| 212 | Key *key, *private; |
| 213 | unsigned char *blob, *data, *signature = NULL; |
| 214 | unsigned int blen, dlen, slen = 0; |
| 215 | Buffer msg; |
| 216 | int ok = -1; |
| 217 | |
| 218 | datafellows = 0; |
| 219 | |
| 220 | blob = buffer_get_string(&e->input, &blen); |
| 221 | data = buffer_get_string(&e->input, &dlen); |
| 222 | |
| 223 | key = dsa_key_from_blob(blob, blen); |
| 224 | if (key != NULL) { |
| 225 | private = lookup_private_key(key, NULL, 2); |
| 226 | if (private != NULL) |
| 227 | ok = dsa_sign(private, &signature, &slen, data, dlen); |
| 228 | } |
| 229 | key_free(key); |
| 230 | buffer_init(&msg); |
| 231 | if (ok == 0) { |
| 232 | buffer_put_char(&msg, SSH2_AGENT_SIGN_RESPONSE); |
| 233 | buffer_put_string(&msg, signature, slen); |
| 234 | } else { |
| 235 | buffer_put_char(&msg, SSH_AGENT_FAILURE); |
| 236 | } |
| 237 | buffer_put_int(&e->output, buffer_len(&msg)); |
| 238 | buffer_append(&e->output, buffer_ptr(&msg), |
| 239 | buffer_len(&msg)); |
| 240 | buffer_free(&msg); |
| 241 | xfree(data); |
| 242 | xfree(blob); |
| 243 | if (signature != NULL) |
| 244 | xfree(signature); |
| 245 | } |
| 246 | |
| 247 | /* shared */ |
| 248 | void |
| 249 | process_remove_identity(SocketEntry *e, int version) |
| 250 | { |
| 251 | Key *key = NULL, *private; |
| 252 | unsigned char *blob; |
| 253 | unsigned int blen; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 254 | unsigned int bits; |
Damien Miller | ad833b3 | 2000-08-23 10:46:23 +1000 | [diff] [blame^] | 255 | int success = 0; |
Damien Miller | 7e8e820 | 1999-11-16 13:37:16 +1100 | [diff] [blame] | 256 | |
Damien Miller | ad833b3 | 2000-08-23 10:46:23 +1000 | [diff] [blame^] | 257 | switch(version){ |
| 258 | case 1: |
| 259 | key = key_new(KEY_RSA); |
| 260 | bits = buffer_get_int(&e->input); |
| 261 | buffer_get_bignum(&e->input, key->rsa->e); |
| 262 | buffer_get_bignum(&e->input, key->rsa->n); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 263 | |
Damien Miller | ad833b3 | 2000-08-23 10:46:23 +1000 | [diff] [blame^] | 264 | if (bits != key_size(key)) |
| 265 | log("Warning: identity keysize mismatch: actual %d, announced %d", |
| 266 | key_size(key), bits); |
| 267 | break; |
| 268 | case 2: |
| 269 | blob = buffer_get_string(&e->input, &blen); |
| 270 | key = dsa_key_from_blob(blob, blen); |
| 271 | xfree(blob); |
| 272 | break; |
| 273 | } |
| 274 | if (key != NULL) { |
| 275 | int idx; |
| 276 | private = lookup_private_key(key, &idx, version); |
| 277 | if (private != NULL) { |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 278 | /* |
| 279 | * We have this key. Free the old key. Since we |
| 280 | * don\'t want to leave empty slots in the middle of |
| 281 | * the array, we actually free the key there and copy |
| 282 | * data from the last entry. |
| 283 | */ |
Damien Miller | ad833b3 | 2000-08-23 10:46:23 +1000 | [diff] [blame^] | 284 | Idtab *tab = idtab_lookup(version); |
| 285 | key_free(tab->identities[idx].key); |
| 286 | xfree(tab->identities[idx].comment); |
| 287 | if (idx != tab->nentries) |
| 288 | tab->identities[idx] = tab->identities[tab->nentries]; |
| 289 | tab->nentries--; |
| 290 | success = 1; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 291 | } |
Damien Miller | ad833b3 | 2000-08-23 10:46:23 +1000 | [diff] [blame^] | 292 | key_free(key); |
| 293 | } |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 294 | buffer_put_int(&e->output, 1); |
Damien Miller | ad833b3 | 2000-08-23 10:46:23 +1000 | [diff] [blame^] | 295 | buffer_put_char(&e->output, |
| 296 | success ? SSH_AGENT_SUCCESS : SSH_AGENT_FAILURE); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 297 | } |
| 298 | |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 299 | void |
Damien Miller | ad833b3 | 2000-08-23 10:46:23 +1000 | [diff] [blame^] | 300 | process_remove_all_identities(SocketEntry *e, int version) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 301 | { |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 302 | unsigned int i; |
Damien Miller | ad833b3 | 2000-08-23 10:46:23 +1000 | [diff] [blame^] | 303 | Idtab *tab = idtab_lookup(version); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 304 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 305 | /* Loop over all identities and clear the keys. */ |
Damien Miller | ad833b3 | 2000-08-23 10:46:23 +1000 | [diff] [blame^] | 306 | for (i = 0; i < tab->nentries; i++) { |
| 307 | key_free(tab->identities[i].key); |
| 308 | xfree(tab->identities[i].comment); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 309 | } |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 310 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 311 | /* Mark that there are no identities. */ |
Damien Miller | ad833b3 | 2000-08-23 10:46:23 +1000 | [diff] [blame^] | 312 | tab->nentries = 0; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 313 | |
| 314 | /* Send success. */ |
| 315 | buffer_put_int(&e->output, 1); |
| 316 | buffer_put_char(&e->output, SSH_AGENT_SUCCESS); |
| 317 | return; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 318 | } |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 319 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 320 | void |
Damien Miller | ad833b3 | 2000-08-23 10:46:23 +1000 | [diff] [blame^] | 321 | process_add_identity(SocketEntry *e, int version) |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 322 | { |
Damien Miller | ad833b3 | 2000-08-23 10:46:23 +1000 | [diff] [blame^] | 323 | Key *k = NULL; |
| 324 | RSA *rsa; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 325 | BIGNUM *aux; |
| 326 | BN_CTX *ctx; |
Damien Miller | ad833b3 | 2000-08-23 10:46:23 +1000 | [diff] [blame^] | 327 | char *type; |
| 328 | char *comment; |
| 329 | int success = 0; |
| 330 | Idtab *tab = idtab_lookup(version); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 331 | |
Damien Miller | ad833b3 | 2000-08-23 10:46:23 +1000 | [diff] [blame^] | 332 | switch (version) { |
| 333 | case 1: |
| 334 | k = key_new(KEY_RSA); |
| 335 | rsa = k->rsa; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 336 | |
Damien Miller | ad833b3 | 2000-08-23 10:46:23 +1000 | [diff] [blame^] | 337 | /* allocate mem for private key */ |
| 338 | /* XXX rsa->n and rsa->e are already allocated */ |
| 339 | rsa->d = BN_new(); |
| 340 | rsa->iqmp = BN_new(); |
| 341 | rsa->q = BN_new(); |
| 342 | rsa->p = BN_new(); |
| 343 | rsa->dmq1 = BN_new(); |
| 344 | rsa->dmp1 = BN_new(); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 345 | |
Damien Miller | ad833b3 | 2000-08-23 10:46:23 +1000 | [diff] [blame^] | 346 | buffer_get_int(&e->input); /* ignored */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 347 | |
Damien Miller | ad833b3 | 2000-08-23 10:46:23 +1000 | [diff] [blame^] | 348 | buffer_get_bignum(&e->input, rsa->n); |
| 349 | buffer_get_bignum(&e->input, rsa->e); |
| 350 | buffer_get_bignum(&e->input, rsa->d); |
| 351 | buffer_get_bignum(&e->input, rsa->iqmp); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 352 | |
Damien Miller | ad833b3 | 2000-08-23 10:46:23 +1000 | [diff] [blame^] | 353 | /* SSH and SSL have p and q swapped */ |
| 354 | buffer_get_bignum(&e->input, rsa->q); /* p */ |
| 355 | buffer_get_bignum(&e->input, rsa->p); /* q */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 356 | |
Damien Miller | ad833b3 | 2000-08-23 10:46:23 +1000 | [diff] [blame^] | 357 | /* Generate additional parameters */ |
| 358 | aux = BN_new(); |
| 359 | ctx = BN_CTX_new(); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 360 | |
Damien Miller | ad833b3 | 2000-08-23 10:46:23 +1000 | [diff] [blame^] | 361 | BN_sub(aux, rsa->q, BN_value_one()); |
| 362 | BN_mod(rsa->dmq1, rsa->d, aux, ctx); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 363 | |
Damien Miller | ad833b3 | 2000-08-23 10:46:23 +1000 | [diff] [blame^] | 364 | BN_sub(aux, rsa->p, BN_value_one()); |
| 365 | BN_mod(rsa->dmp1, rsa->d, aux, ctx); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 366 | |
Damien Miller | ad833b3 | 2000-08-23 10:46:23 +1000 | [diff] [blame^] | 367 | BN_clear_free(aux); |
| 368 | BN_CTX_free(ctx); |
| 369 | |
| 370 | break; |
| 371 | case 2: |
| 372 | type = buffer_get_string(&e->input, NULL); |
| 373 | if (strcmp(type, KEX_DSS)) { |
| 374 | buffer_clear(&e->input); |
| 375 | xfree(type); |
| 376 | goto send; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 377 | } |
Damien Miller | ad833b3 | 2000-08-23 10:46:23 +1000 | [diff] [blame^] | 378 | xfree(type); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 379 | |
Damien Miller | ad833b3 | 2000-08-23 10:46:23 +1000 | [diff] [blame^] | 380 | k = key_new(KEY_DSA); |
| 381 | |
| 382 | /* allocate mem for private key */ |
| 383 | k->dsa->priv_key = BN_new(); |
| 384 | |
| 385 | buffer_get_bignum2(&e->input, k->dsa->p); |
| 386 | buffer_get_bignum2(&e->input, k->dsa->q); |
| 387 | buffer_get_bignum2(&e->input, k->dsa->g); |
| 388 | buffer_get_bignum2(&e->input, k->dsa->pub_key); |
| 389 | buffer_get_bignum2(&e->input, k->dsa->priv_key); |
| 390 | |
| 391 | break; |
| 392 | } |
| 393 | |
| 394 | comment = buffer_get_string(&e->input, NULL); |
| 395 | if (k == NULL) { |
| 396 | xfree(comment); |
| 397 | goto send; |
| 398 | } |
| 399 | success = 1; |
| 400 | if (lookup_private_key(k, NULL, version) == NULL) { |
| 401 | if (tab->nentries == 0) |
| 402 | tab->identities = xmalloc(sizeof(Identity)); |
| 403 | else |
| 404 | tab->identities = xrealloc(tab->identities, |
| 405 | (tab->nentries + 1) * sizeof(Identity)); |
| 406 | tab->identities[tab->nentries].key = k; |
| 407 | tab->identities[tab->nentries].comment = comment; |
| 408 | /* Increment the number of identities. */ |
| 409 | tab->nentries++; |
| 410 | } else { |
| 411 | key_free(k); |
| 412 | xfree(comment); |
| 413 | } |
| 414 | send: |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 415 | buffer_put_int(&e->output, 1); |
Damien Miller | ad833b3 | 2000-08-23 10:46:23 +1000 | [diff] [blame^] | 416 | buffer_put_char(&e->output, |
| 417 | success ? SSH_AGENT_SUCCESS : SSH_AGENT_FAILURE); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 418 | } |
| 419 | |
Damien Miller | ad833b3 | 2000-08-23 10:46:23 +1000 | [diff] [blame^] | 420 | /* dispatch incoming messages */ |
| 421 | |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 422 | void |
| 423 | process_message(SocketEntry *e) |
| 424 | { |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 425 | unsigned int msg_len; |
| 426 | unsigned int type; |
| 427 | unsigned char *cp; |
| 428 | if (buffer_len(&e->input) < 5) |
| 429 | return; /* Incomplete message. */ |
| 430 | cp = (unsigned char *) buffer_ptr(&e->input); |
| 431 | msg_len = GET_32BIT(cp); |
| 432 | if (msg_len > 256 * 1024) { |
| 433 | shutdown(e->fd, SHUT_RDWR); |
| 434 | close(e->fd); |
| 435 | e->type = AUTH_UNUSED; |
| 436 | return; |
| 437 | } |
| 438 | if (buffer_len(&e->input) < msg_len + 4) |
| 439 | return; |
| 440 | buffer_consume(&e->input, 4); |
| 441 | type = buffer_get_char(&e->input); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 442 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 443 | switch (type) { |
Damien Miller | ad833b3 | 2000-08-23 10:46:23 +1000 | [diff] [blame^] | 444 | /* ssh1 */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 445 | case SSH_AGENTC_RSA_CHALLENGE: |
Damien Miller | ad833b3 | 2000-08-23 10:46:23 +1000 | [diff] [blame^] | 446 | process_authentication_challenge1(e); |
| 447 | break; |
| 448 | case SSH_AGENTC_REQUEST_RSA_IDENTITIES: |
| 449 | process_request_identities(e, 1); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 450 | break; |
| 451 | case SSH_AGENTC_ADD_RSA_IDENTITY: |
Damien Miller | ad833b3 | 2000-08-23 10:46:23 +1000 | [diff] [blame^] | 452 | process_add_identity(e, 1); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 453 | break; |
| 454 | case SSH_AGENTC_REMOVE_RSA_IDENTITY: |
Damien Miller | ad833b3 | 2000-08-23 10:46:23 +1000 | [diff] [blame^] | 455 | process_remove_identity(e, 1); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 456 | break; |
| 457 | case SSH_AGENTC_REMOVE_ALL_RSA_IDENTITIES: |
Damien Miller | ad833b3 | 2000-08-23 10:46:23 +1000 | [diff] [blame^] | 458 | process_remove_all_identities(e, 1); |
| 459 | break; |
| 460 | /* ssh2 */ |
| 461 | case SSH2_AGENTC_SIGN_REQUEST: |
| 462 | process_sign_request2(e); |
| 463 | break; |
| 464 | case SSH2_AGENTC_REQUEST_IDENTITIES: |
| 465 | process_request_identities(e, 2); |
| 466 | break; |
| 467 | case SSH2_AGENTC_ADD_IDENTITY: |
| 468 | process_add_identity(e, 2); |
| 469 | break; |
| 470 | case SSH2_AGENTC_REMOVE_IDENTITY: |
| 471 | process_remove_identity(e, 2); |
| 472 | break; |
| 473 | case SSH2_AGENTC_REMOVE_ALL_IDENTITIES: |
| 474 | process_remove_all_identities(e, 2); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 475 | break; |
| 476 | default: |
| 477 | /* Unknown message. Respond with failure. */ |
| 478 | error("Unknown message %d", type); |
| 479 | buffer_clear(&e->input); |
| 480 | buffer_put_int(&e->output, 1); |
| 481 | buffer_put_char(&e->output, SSH_AGENT_FAILURE); |
| 482 | break; |
| 483 | } |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 484 | } |
| 485 | |
| 486 | void |
| 487 | new_socket(int type, int fd) |
| 488 | { |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 489 | unsigned int i, old_alloc; |
| 490 | if (fcntl(fd, F_SETFL, O_NONBLOCK) < 0) |
| 491 | error("fcntl O_NONBLOCK: %s", strerror(errno)); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 492 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 493 | if (fd > max_fd) |
| 494 | max_fd = fd; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 495 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 496 | for (i = 0; i < sockets_alloc; i++) |
| 497 | if (sockets[i].type == AUTH_UNUSED) { |
| 498 | sockets[i].fd = fd; |
| 499 | sockets[i].type = type; |
| 500 | buffer_init(&sockets[i].input); |
| 501 | buffer_init(&sockets[i].output); |
| 502 | return; |
| 503 | } |
| 504 | old_alloc = sockets_alloc; |
| 505 | sockets_alloc += 10; |
| 506 | if (sockets) |
| 507 | sockets = xrealloc(sockets, sockets_alloc * sizeof(sockets[0])); |
| 508 | else |
| 509 | sockets = xmalloc(sockets_alloc * sizeof(sockets[0])); |
| 510 | for (i = old_alloc; i < sockets_alloc; i++) |
| 511 | sockets[i].type = AUTH_UNUSED; |
| 512 | sockets[old_alloc].type = type; |
| 513 | sockets[old_alloc].fd = fd; |
| 514 | buffer_init(&sockets[old_alloc].input); |
| 515 | buffer_init(&sockets[old_alloc].output); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 516 | } |
| 517 | |
| 518 | void |
| 519 | prepare_select(fd_set *readset, fd_set *writeset) |
| 520 | { |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 521 | unsigned int i; |
| 522 | for (i = 0; i < sockets_alloc; i++) |
| 523 | switch (sockets[i].type) { |
| 524 | case AUTH_SOCKET: |
| 525 | case AUTH_CONNECTION: |
| 526 | FD_SET(sockets[i].fd, readset); |
| 527 | if (buffer_len(&sockets[i].output) > 0) |
| 528 | FD_SET(sockets[i].fd, writeset); |
| 529 | break; |
| 530 | case AUTH_UNUSED: |
| 531 | break; |
| 532 | default: |
| 533 | fatal("Unknown socket type %d", sockets[i].type); |
| 534 | break; |
| 535 | } |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 536 | } |
| 537 | |
Damien Miller | 4af5130 | 2000-04-16 11:18:38 +1000 | [diff] [blame] | 538 | void |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 539 | after_select(fd_set *readset, fd_set *writeset) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 540 | { |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 541 | unsigned int i; |
| 542 | int len, sock; |
Damien Miller | 7684ee1 | 2000-03-17 23:40:15 +1100 | [diff] [blame] | 543 | socklen_t slen; |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 544 | char buf[1024]; |
| 545 | struct sockaddr_un sunaddr; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 546 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 547 | for (i = 0; i < sockets_alloc; i++) |
| 548 | switch (sockets[i].type) { |
| 549 | case AUTH_UNUSED: |
| 550 | break; |
| 551 | case AUTH_SOCKET: |
| 552 | if (FD_ISSET(sockets[i].fd, readset)) { |
Damien Miller | 7684ee1 | 2000-03-17 23:40:15 +1100 | [diff] [blame] | 553 | slen = sizeof(sunaddr); |
| 554 | sock = accept(sockets[i].fd, (struct sockaddr *) & sunaddr, &slen); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 555 | if (sock < 0) { |
| 556 | perror("accept from AUTH_SOCKET"); |
| 557 | break; |
| 558 | } |
| 559 | new_socket(AUTH_CONNECTION, sock); |
| 560 | } |
| 561 | break; |
| 562 | case AUTH_CONNECTION: |
| 563 | if (buffer_len(&sockets[i].output) > 0 && |
| 564 | FD_ISSET(sockets[i].fd, writeset)) { |
| 565 | len = write(sockets[i].fd, buffer_ptr(&sockets[i].output), |
| 566 | buffer_len(&sockets[i].output)); |
| 567 | if (len <= 0) { |
| 568 | shutdown(sockets[i].fd, SHUT_RDWR); |
| 569 | close(sockets[i].fd); |
| 570 | sockets[i].type = AUTH_UNUSED; |
Damien Miller | a552faf | 2000-04-21 15:55:20 +1000 | [diff] [blame] | 571 | buffer_free(&sockets[i].input); |
| 572 | buffer_free(&sockets[i].output); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 573 | break; |
| 574 | } |
| 575 | buffer_consume(&sockets[i].output, len); |
| 576 | } |
| 577 | if (FD_ISSET(sockets[i].fd, readset)) { |
| 578 | len = read(sockets[i].fd, buf, sizeof(buf)); |
| 579 | if (len <= 0) { |
| 580 | shutdown(sockets[i].fd, SHUT_RDWR); |
| 581 | close(sockets[i].fd); |
| 582 | sockets[i].type = AUTH_UNUSED; |
Damien Miller | a552faf | 2000-04-21 15:55:20 +1000 | [diff] [blame] | 583 | buffer_free(&sockets[i].input); |
| 584 | buffer_free(&sockets[i].output); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 585 | break; |
| 586 | } |
| 587 | buffer_append(&sockets[i].input, buf, len); |
| 588 | process_message(&sockets[i]); |
| 589 | } |
| 590 | break; |
| 591 | default: |
| 592 | fatal("Unknown type %d", sockets[i].type); |
| 593 | } |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 594 | } |
| 595 | |
| 596 | void |
| 597 | check_parent_exists(int sig) |
| 598 | { |
Damien Miller | 166fca8 | 2000-04-20 07:42:21 +1000 | [diff] [blame] | 599 | if (parent_pid != -1 && kill(parent_pid, 0) < 0) { |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 600 | /* printf("Parent has died - Authentication agent exiting.\n"); */ |
| 601 | exit(1); |
| 602 | } |
| 603 | signal(SIGALRM, check_parent_exists); |
| 604 | alarm(10); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 605 | } |
| 606 | |
Damien Miller | 792c511 | 1999-10-29 09:47:09 +1000 | [diff] [blame] | 607 | void |
| 608 | cleanup_socket(void) |
| 609 | { |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 610 | remove(socket_name); |
| 611 | rmdir(socket_dir); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 612 | } |
| 613 | |
Damien Miller | 792c511 | 1999-10-29 09:47:09 +1000 | [diff] [blame] | 614 | void |
| 615 | cleanup_exit(int i) |
| 616 | { |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 617 | cleanup_socket(); |
| 618 | exit(i); |
Damien Miller | 792c511 | 1999-10-29 09:47:09 +1000 | [diff] [blame] | 619 | } |
| 620 | |
| 621 | void |
| 622 | usage() |
| 623 | { |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 624 | fprintf(stderr, "ssh-agent version %s\n", SSH_VERSION); |
| 625 | fprintf(stderr, "Usage: %s [-c | -s] [-k] [command {args...]]\n", |
| 626 | __progname); |
| 627 | exit(1); |
Damien Miller | 792c511 | 1999-10-29 09:47:09 +1000 | [diff] [blame] | 628 | } |
| 629 | |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 630 | int |
| 631 | main(int ac, char **av) |
| 632 | { |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 633 | fd_set readset, writeset; |
| 634 | int sock, c_flag = 0, k_flag = 0, s_flag = 0, ch; |
| 635 | struct sockaddr_un sunaddr; |
| 636 | pid_t pid; |
| 637 | char *shell, *format, *pidstr, pidstrbuf[1 + 3 * sizeof pid]; |
Damien Miller | 615f939 | 2000-05-17 22:53:33 +1000 | [diff] [blame] | 638 | extern int optind; |
Damien Miller | ad833b3 | 2000-08-23 10:46:23 +1000 | [diff] [blame^] | 639 | |
Damien Miller | f9b625c | 2000-07-09 22:42:32 +1000 | [diff] [blame] | 640 | init_rng(); |
Damien Miller | ad833b3 | 2000-08-23 10:46:23 +1000 | [diff] [blame^] | 641 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 642 | /* check if RSA support exists */ |
| 643 | if (rsa_alive() == 0) { |
| 644 | fprintf(stderr, |
| 645 | "%s: no RSA support in libssl and libcrypto. See ssl(8).\n", |
| 646 | __progname); |
| 647 | exit(1); |
| 648 | } |
Damien Miller | d0cff3e | 2000-04-20 23:12:58 +1000 | [diff] [blame] | 649 | #ifdef __GNU_LIBRARY__ |
| 650 | while ((ch = getopt(ac, av, "+cks")) != -1) { |
| 651 | #else /* __GNU_LIBRARY__ */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 652 | while ((ch = getopt(ac, av, "cks")) != -1) { |
Damien Miller | d0cff3e | 2000-04-20 23:12:58 +1000 | [diff] [blame] | 653 | #endif /* __GNU_LIBRARY__ */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 654 | switch (ch) { |
| 655 | case 'c': |
| 656 | if (s_flag) |
| 657 | usage(); |
| 658 | c_flag++; |
| 659 | break; |
| 660 | case 'k': |
| 661 | k_flag++; |
| 662 | break; |
| 663 | case 's': |
| 664 | if (c_flag) |
| 665 | usage(); |
| 666 | s_flag++; |
| 667 | break; |
| 668 | default: |
| 669 | usage(); |
| 670 | } |
Damien Miller | 792c511 | 1999-10-29 09:47:09 +1000 | [diff] [blame] | 671 | } |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 672 | ac -= optind; |
| 673 | av += optind; |
Damien Miller | 792c511 | 1999-10-29 09:47:09 +1000 | [diff] [blame] | 674 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 675 | if (ac > 0 && (c_flag || k_flag || s_flag)) |
| 676 | usage(); |
Damien Miller | 792c511 | 1999-10-29 09:47:09 +1000 | [diff] [blame] | 677 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 678 | if (ac == 0 && !c_flag && !k_flag && !s_flag) { |
| 679 | shell = getenv("SHELL"); |
| 680 | if (shell != NULL && strncmp(shell + strlen(shell) - 3, "csh", 3) == 0) |
| 681 | c_flag = 1; |
Damien Miller | 792c511 | 1999-10-29 09:47:09 +1000 | [diff] [blame] | 682 | } |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 683 | if (k_flag) { |
| 684 | pidstr = getenv(SSH_AGENTPID_ENV_NAME); |
| 685 | if (pidstr == NULL) { |
| 686 | fprintf(stderr, "%s not set, cannot kill agent\n", |
| 687 | SSH_AGENTPID_ENV_NAME); |
| 688 | exit(1); |
| 689 | } |
| 690 | pid = atoi(pidstr); |
| 691 | if (pid < 1) { /* XXX PID_MAX check too */ |
Damien Miller | 166fca8 | 2000-04-20 07:42:21 +1000 | [diff] [blame] | 692 | /* Yes, PID_MAX check please */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 693 | fprintf(stderr, "%s=\"%s\", which is not a good PID\n", |
| 694 | SSH_AGENTPID_ENV_NAME, pidstr); |
| 695 | exit(1); |
| 696 | } |
| 697 | if (kill(pid, SIGTERM) == -1) { |
| 698 | perror("kill"); |
| 699 | exit(1); |
| 700 | } |
| 701 | format = c_flag ? "unsetenv %s;\n" : "unset %s;\n"; |
| 702 | printf(format, SSH_AUTHSOCKET_ENV_NAME); |
| 703 | printf(format, SSH_AGENTPID_ENV_NAME); |
| 704 | printf("echo Agent pid %d killed;\n", pid); |
| 705 | exit(0); |
Damien Miller | 792c511 | 1999-10-29 09:47:09 +1000 | [diff] [blame] | 706 | } |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 707 | parent_pid = getpid(); |
| 708 | |
| 709 | /* Create private directory for agent socket */ |
| 710 | strlcpy(socket_dir, "/tmp/ssh-XXXXXXXX", sizeof socket_dir); |
| 711 | if (mkdtemp(socket_dir) == NULL) { |
| 712 | perror("mkdtemp: private socket dir"); |
| 713 | exit(1); |
Damien Miller | 792c511 | 1999-10-29 09:47:09 +1000 | [diff] [blame] | 714 | } |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 715 | snprintf(socket_name, sizeof socket_name, "%s/agent.%d", socket_dir, |
| 716 | parent_pid); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 717 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 718 | /* |
| 719 | * Create socket early so it will exist before command gets run from |
| 720 | * the parent. |
| 721 | */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 722 | sock = socket(AF_UNIX, SOCK_STREAM, 0); |
| 723 | if (sock < 0) { |
| 724 | perror("socket"); |
| 725 | cleanup_exit(1); |
Damien Miller | 792c511 | 1999-10-29 09:47:09 +1000 | [diff] [blame] | 726 | } |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 727 | memset(&sunaddr, 0, sizeof(sunaddr)); |
| 728 | sunaddr.sun_family = AF_UNIX; |
| 729 | strlcpy(sunaddr.sun_path, socket_name, sizeof(sunaddr.sun_path)); |
| 730 | if (bind(sock, (struct sockaddr *) & sunaddr, sizeof(sunaddr)) < 0) { |
| 731 | perror("bind"); |
| 732 | cleanup_exit(1); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 733 | } |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 734 | if (listen(sock, 5) < 0) { |
| 735 | perror("listen"); |
| 736 | cleanup_exit(1); |
| 737 | } |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 738 | /* |
| 739 | * Fork, and have the parent execute the command, if any, or present |
| 740 | * the socket data. The child continues as the authentication agent. |
| 741 | */ |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 742 | pid = fork(); |
| 743 | if (pid == -1) { |
| 744 | perror("fork"); |
| 745 | exit(1); |
| 746 | } |
| 747 | if (pid != 0) { /* Parent - execute the given command. */ |
| 748 | close(sock); |
| 749 | snprintf(pidstrbuf, sizeof pidstrbuf, "%d", pid); |
| 750 | if (ac == 0) { |
| 751 | format = c_flag ? "setenv %s %s;\n" : "%s=%s; export %s;\n"; |
| 752 | printf(format, SSH_AUTHSOCKET_ENV_NAME, socket_name, |
| 753 | SSH_AUTHSOCKET_ENV_NAME); |
| 754 | printf(format, SSH_AGENTPID_ENV_NAME, pidstrbuf, |
| 755 | SSH_AGENTPID_ENV_NAME); |
| 756 | printf("echo Agent pid %d;\n", pid); |
| 757 | exit(0); |
| 758 | } |
| 759 | setenv(SSH_AUTHSOCKET_ENV_NAME, socket_name, 1); |
| 760 | setenv(SSH_AGENTPID_ENV_NAME, pidstrbuf, 1); |
| 761 | execvp(av[0], av); |
| 762 | perror(av[0]); |
| 763 | exit(1); |
| 764 | } |
| 765 | close(0); |
| 766 | close(1); |
| 767 | close(2); |
| 768 | |
| 769 | if (setsid() == -1) { |
| 770 | perror("setsid"); |
| 771 | cleanup_exit(1); |
| 772 | } |
| 773 | if (atexit(cleanup_socket) < 0) { |
| 774 | perror("atexit"); |
| 775 | cleanup_exit(1); |
| 776 | } |
| 777 | new_socket(AUTH_SOCKET, sock); |
| 778 | if (ac > 0) { |
| 779 | signal(SIGALRM, check_parent_exists); |
| 780 | alarm(10); |
| 781 | } |
Damien Miller | ad833b3 | 2000-08-23 10:46:23 +1000 | [diff] [blame^] | 782 | idtab_init(); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 783 | signal(SIGINT, SIG_IGN); |
| 784 | signal(SIGPIPE, SIG_IGN); |
Damien Miller | 4af5130 | 2000-04-16 11:18:38 +1000 | [diff] [blame] | 785 | signal(SIGHUP, cleanup_exit); |
| 786 | signal(SIGTERM, cleanup_exit); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 787 | while (1) { |
| 788 | FD_ZERO(&readset); |
| 789 | FD_ZERO(&writeset); |
| 790 | prepare_select(&readset, &writeset); |
| 791 | if (select(max_fd + 1, &readset, &writeset, NULL, NULL) < 0) { |
| 792 | if (errno == EINTR) |
| 793 | continue; |
| 794 | exit(1); |
| 795 | } |
| 796 | after_select(&readset, &writeset); |
| 797 | } |
| 798 | /* NOTREACHED */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 799 | } |