Greg Hartman | bd77cf7 | 2015-02-25 13:21:06 -0800 | [diff] [blame^] | 1 | /* $OpenBSD: authfd.c,v 1.86 2011/07/06 18:09:21 tedu Exp $ */ |
| 2 | /* |
| 3 | * Author: Tatu Ylonen <ylo@cs.hut.fi> |
| 4 | * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland |
| 5 | * All rights reserved |
| 6 | * Functions for connecting the local authentication agent. |
| 7 | * |
| 8 | * As far as I am concerned, the code I have written for this software |
| 9 | * can be used freely for any purpose. Any derived versions of this |
| 10 | * software must be clearly marked as such, and if the derived work is |
| 11 | * incompatible with the protocol description in the RFC file, it must be |
| 12 | * called by a name other than "ssh" or "Secure Shell". |
| 13 | * |
| 14 | * SSH2 implementation, |
| 15 | * Copyright (c) 2000 Markus Friedl. All rights reserved. |
| 16 | * |
| 17 | * Redistribution and use in source and binary forms, with or without |
| 18 | * modification, are permitted provided that the following conditions |
| 19 | * are met: |
| 20 | * 1. Redistributions of source code must retain the above copyright |
| 21 | * notice, this list of conditions and the following disclaimer. |
| 22 | * 2. Redistributions in binary form must reproduce the above copyright |
| 23 | * notice, this list of conditions and the following disclaimer in the |
| 24 | * documentation and/or other materials provided with the distribution. |
| 25 | * |
| 26 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
| 27 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
| 28 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
| 29 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
| 30 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
| 31 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| 32 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| 33 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| 34 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
| 35 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| 36 | */ |
| 37 | |
| 38 | #include "includes.h" |
| 39 | |
| 40 | #include <sys/types.h> |
| 41 | #include <sys/un.h> |
| 42 | #include <sys/socket.h> |
| 43 | |
| 44 | #include <openssl/evp.h> |
| 45 | |
| 46 | #include <openssl/crypto.h> |
| 47 | #include <fcntl.h> |
| 48 | #include <stdlib.h> |
| 49 | #include <signal.h> |
| 50 | #include <stdarg.h> |
| 51 | #include <string.h> |
| 52 | #include <unistd.h> |
| 53 | |
| 54 | #include "xmalloc.h" |
| 55 | #include "ssh.h" |
| 56 | #include "rsa.h" |
| 57 | #include "buffer.h" |
| 58 | #include "key.h" |
| 59 | #include "authfd.h" |
| 60 | #include "cipher.h" |
| 61 | #include "kex.h" |
| 62 | #include "compat.h" |
| 63 | #include "log.h" |
| 64 | #include "atomicio.h" |
| 65 | #include "misc.h" |
| 66 | |
| 67 | static int agent_present = 0; |
| 68 | |
| 69 | /* helper */ |
| 70 | int decode_reply(int type); |
| 71 | |
| 72 | /* macro to check for "agent failure" message */ |
| 73 | #define agent_failed(x) \ |
| 74 | ((x == SSH_AGENT_FAILURE) || (x == SSH_COM_AGENT2_FAILURE) || \ |
| 75 | (x == SSH2_AGENT_FAILURE)) |
| 76 | |
| 77 | int |
| 78 | ssh_agent_present(void) |
| 79 | { |
| 80 | int authfd; |
| 81 | |
| 82 | if (agent_present) |
| 83 | return 1; |
| 84 | if ((authfd = ssh_get_authentication_socket()) == -1) |
| 85 | return 0; |
| 86 | else { |
| 87 | ssh_close_authentication_socket(authfd); |
| 88 | return 1; |
| 89 | } |
| 90 | } |
| 91 | |
| 92 | /* Returns the number of the authentication fd, or -1 if there is none. */ |
| 93 | |
| 94 | int |
| 95 | ssh_get_authentication_socket(void) |
| 96 | { |
| 97 | const char *authsocket; |
| 98 | int sock; |
| 99 | struct sockaddr_un sunaddr; |
| 100 | |
| 101 | authsocket = getenv(SSH_AUTHSOCKET_ENV_NAME); |
| 102 | if (!authsocket) |
| 103 | return -1; |
| 104 | |
| 105 | bzero(&sunaddr, sizeof(sunaddr)); |
| 106 | sunaddr.sun_family = AF_UNIX; |
| 107 | strlcpy(sunaddr.sun_path, authsocket, sizeof(sunaddr.sun_path)); |
| 108 | |
| 109 | sock = socket(AF_UNIX, SOCK_STREAM, 0); |
| 110 | if (sock < 0) |
| 111 | return -1; |
| 112 | |
| 113 | /* close on exec */ |
| 114 | if (fcntl(sock, F_SETFD, FD_CLOEXEC) == -1) { |
| 115 | close(sock); |
| 116 | return -1; |
| 117 | } |
| 118 | if (connect(sock, (struct sockaddr *)&sunaddr, sizeof sunaddr) < 0) { |
| 119 | close(sock); |
| 120 | return -1; |
| 121 | } |
| 122 | agent_present = 1; |
| 123 | return sock; |
| 124 | } |
| 125 | |
| 126 | static int |
| 127 | ssh_request_reply(AuthenticationConnection *auth, Buffer *request, Buffer *reply) |
| 128 | { |
| 129 | u_int l, len; |
| 130 | char buf[1024]; |
| 131 | |
| 132 | /* Get the length of the message, and format it in the buffer. */ |
| 133 | len = buffer_len(request); |
| 134 | put_u32(buf, len); |
| 135 | |
| 136 | /* Send the length and then the packet to the agent. */ |
| 137 | if (atomicio(vwrite, auth->fd, buf, 4) != 4 || |
| 138 | atomicio(vwrite, auth->fd, buffer_ptr(request), |
| 139 | buffer_len(request)) != buffer_len(request)) { |
| 140 | error("Error writing to authentication socket."); |
| 141 | return 0; |
| 142 | } |
| 143 | /* |
| 144 | * Wait for response from the agent. First read the length of the |
| 145 | * response packet. |
| 146 | */ |
| 147 | if (atomicio(read, auth->fd, buf, 4) != 4) { |
| 148 | error("Error reading response length from authentication socket."); |
| 149 | return 0; |
| 150 | } |
| 151 | |
| 152 | /* Extract the length, and check it for sanity. */ |
| 153 | len = get_u32(buf); |
| 154 | if (len > 256 * 1024) |
| 155 | fatal("Authentication response too long: %u", len); |
| 156 | |
| 157 | /* Read the rest of the response in to the buffer. */ |
| 158 | buffer_clear(reply); |
| 159 | while (len > 0) { |
| 160 | l = len; |
| 161 | if (l > sizeof(buf)) |
| 162 | l = sizeof(buf); |
| 163 | if (atomicio(read, auth->fd, buf, l) != l) { |
| 164 | error("Error reading response from authentication socket."); |
| 165 | return 0; |
| 166 | } |
| 167 | buffer_append(reply, buf, l); |
| 168 | len -= l; |
| 169 | } |
| 170 | return 1; |
| 171 | } |
| 172 | |
| 173 | /* |
| 174 | * Closes the agent socket if it should be closed (depends on how it was |
| 175 | * obtained). The argument must have been returned by |
| 176 | * ssh_get_authentication_socket(). |
| 177 | */ |
| 178 | |
| 179 | void |
| 180 | ssh_close_authentication_socket(int sock) |
| 181 | { |
| 182 | if (getenv(SSH_AUTHSOCKET_ENV_NAME)) |
| 183 | close(sock); |
| 184 | } |
| 185 | |
| 186 | /* |
| 187 | * Opens and connects a private socket for communication with the |
| 188 | * authentication agent. Returns the file descriptor (which must be |
| 189 | * shut down and closed by the caller when no longer needed). |
| 190 | * Returns NULL if an error occurred and the connection could not be |
| 191 | * opened. |
| 192 | */ |
| 193 | |
| 194 | AuthenticationConnection * |
| 195 | ssh_get_authentication_connection(void) |
| 196 | { |
| 197 | AuthenticationConnection *auth; |
| 198 | int sock; |
| 199 | |
| 200 | sock = ssh_get_authentication_socket(); |
| 201 | |
| 202 | /* |
| 203 | * Fail if we couldn't obtain a connection. This happens if we |
| 204 | * exited due to a timeout. |
| 205 | */ |
| 206 | if (sock < 0) |
| 207 | return NULL; |
| 208 | |
| 209 | auth = xmalloc(sizeof(*auth)); |
| 210 | auth->fd = sock; |
| 211 | buffer_init(&auth->identities); |
| 212 | auth->howmany = 0; |
| 213 | |
| 214 | return auth; |
| 215 | } |
| 216 | |
| 217 | /* |
| 218 | * Closes the connection to the authentication agent and frees any associated |
| 219 | * memory. |
| 220 | */ |
| 221 | |
| 222 | void |
| 223 | ssh_close_authentication_connection(AuthenticationConnection *auth) |
| 224 | { |
| 225 | buffer_free(&auth->identities); |
| 226 | close(auth->fd); |
| 227 | xfree(auth); |
| 228 | } |
| 229 | |
| 230 | /* Lock/unlock agent */ |
| 231 | int |
| 232 | ssh_lock_agent(AuthenticationConnection *auth, int lock, const char *password) |
| 233 | { |
| 234 | int type; |
| 235 | Buffer msg; |
| 236 | |
| 237 | buffer_init(&msg); |
| 238 | buffer_put_char(&msg, lock ? SSH_AGENTC_LOCK : SSH_AGENTC_UNLOCK); |
| 239 | buffer_put_cstring(&msg, password); |
| 240 | |
| 241 | if (ssh_request_reply(auth, &msg, &msg) == 0) { |
| 242 | buffer_free(&msg); |
| 243 | return 0; |
| 244 | } |
| 245 | type = buffer_get_char(&msg); |
| 246 | buffer_free(&msg); |
| 247 | return decode_reply(type); |
| 248 | } |
| 249 | |
| 250 | /* |
| 251 | * Returns the first authentication identity held by the agent. |
| 252 | */ |
| 253 | |
| 254 | int |
| 255 | ssh_get_num_identities(AuthenticationConnection *auth, int version) |
| 256 | { |
| 257 | int type, code1 = 0, code2 = 0; |
| 258 | Buffer request; |
| 259 | |
| 260 | switch (version) { |
| 261 | case 1: |
| 262 | code1 = SSH_AGENTC_REQUEST_RSA_IDENTITIES; |
| 263 | code2 = SSH_AGENT_RSA_IDENTITIES_ANSWER; |
| 264 | break; |
| 265 | case 2: |
| 266 | code1 = SSH2_AGENTC_REQUEST_IDENTITIES; |
| 267 | code2 = SSH2_AGENT_IDENTITIES_ANSWER; |
| 268 | break; |
| 269 | default: |
| 270 | return 0; |
| 271 | } |
| 272 | |
| 273 | /* |
| 274 | * Send a message to the agent requesting for a list of the |
| 275 | * identities it can represent. |
| 276 | */ |
| 277 | buffer_init(&request); |
| 278 | buffer_put_char(&request, code1); |
| 279 | |
| 280 | buffer_clear(&auth->identities); |
| 281 | if (ssh_request_reply(auth, &request, &auth->identities) == 0) { |
| 282 | buffer_free(&request); |
| 283 | return 0; |
| 284 | } |
| 285 | buffer_free(&request); |
| 286 | |
| 287 | /* Get message type, and verify that we got a proper answer. */ |
| 288 | type = buffer_get_char(&auth->identities); |
| 289 | if (agent_failed(type)) { |
| 290 | return 0; |
| 291 | } else if (type != code2) { |
| 292 | fatal("Bad authentication reply message type: %d", type); |
| 293 | } |
| 294 | |
| 295 | /* Get the number of entries in the response and check it for sanity. */ |
| 296 | auth->howmany = buffer_get_int(&auth->identities); |
| 297 | if ((u_int)auth->howmany > 1024) |
| 298 | fatal("Too many identities in authentication reply: %d", |
| 299 | auth->howmany); |
| 300 | |
| 301 | return auth->howmany; |
| 302 | } |
| 303 | |
| 304 | Key * |
| 305 | ssh_get_first_identity(AuthenticationConnection *auth, char **comment, int version) |
| 306 | { |
| 307 | /* get number of identities and return the first entry (if any). */ |
| 308 | if (ssh_get_num_identities(auth, version) > 0) |
| 309 | return ssh_get_next_identity(auth, comment, version); |
| 310 | return NULL; |
| 311 | } |
| 312 | |
| 313 | Key * |
| 314 | ssh_get_next_identity(AuthenticationConnection *auth, char **comment, int version) |
| 315 | { |
| 316 | int keybits; |
| 317 | u_int bits; |
| 318 | u_char *blob; |
| 319 | u_int blen; |
| 320 | Key *key = NULL; |
| 321 | |
| 322 | /* Return failure if no more entries. */ |
| 323 | if (auth->howmany <= 0) |
| 324 | return NULL; |
| 325 | |
| 326 | /* |
| 327 | * Get the next entry from the packet. These will abort with a fatal |
| 328 | * error if the packet is too short or contains corrupt data. |
| 329 | */ |
| 330 | switch (version) { |
| 331 | case 1: |
| 332 | key = key_new(KEY_RSA1); |
| 333 | bits = buffer_get_int(&auth->identities); |
| 334 | buffer_get_bignum(&auth->identities, key->rsa->e); |
| 335 | buffer_get_bignum(&auth->identities, key->rsa->n); |
| 336 | *comment = buffer_get_string(&auth->identities, NULL); |
| 337 | keybits = BN_num_bits(key->rsa->n); |
| 338 | if (keybits < 0 || bits != (u_int)keybits) |
| 339 | logit("Warning: identity keysize mismatch: actual %d, announced %u", |
| 340 | BN_num_bits(key->rsa->n), bits); |
| 341 | break; |
| 342 | case 2: |
| 343 | blob = buffer_get_string(&auth->identities, &blen); |
| 344 | *comment = buffer_get_string(&auth->identities, NULL); |
| 345 | key = key_from_blob(blob, blen); |
| 346 | xfree(blob); |
| 347 | break; |
| 348 | default: |
| 349 | return NULL; |
| 350 | } |
| 351 | /* Decrement the number of remaining entries. */ |
| 352 | auth->howmany--; |
| 353 | return key; |
| 354 | } |
| 355 | |
| 356 | /* |
| 357 | * Generates a random challenge, sends it to the agent, and waits for |
| 358 | * response from the agent. Returns true (non-zero) if the agent gave the |
| 359 | * correct answer, zero otherwise. Response type selects the style of |
| 360 | * response desired, with 0 corresponding to protocol version 1.0 (no longer |
| 361 | * supported) and 1 corresponding to protocol version 1.1. |
| 362 | */ |
| 363 | |
| 364 | int |
| 365 | ssh_decrypt_challenge(AuthenticationConnection *auth, |
| 366 | Key* key, BIGNUM *challenge, |
| 367 | u_char session_id[16], |
| 368 | u_int response_type, |
| 369 | u_char response[16]) |
| 370 | { |
| 371 | Buffer buffer; |
| 372 | int success = 0; |
| 373 | int i; |
| 374 | int type; |
| 375 | |
| 376 | if (key->type != KEY_RSA1) |
| 377 | return 0; |
| 378 | if (response_type == 0) { |
| 379 | logit("Compatibility with ssh protocol version 1.0 no longer supported."); |
| 380 | return 0; |
| 381 | } |
| 382 | buffer_init(&buffer); |
| 383 | buffer_put_char(&buffer, SSH_AGENTC_RSA_CHALLENGE); |
| 384 | buffer_put_int(&buffer, BN_num_bits(key->rsa->n)); |
| 385 | buffer_put_bignum(&buffer, key->rsa->e); |
| 386 | buffer_put_bignum(&buffer, key->rsa->n); |
| 387 | buffer_put_bignum(&buffer, challenge); |
| 388 | buffer_append(&buffer, session_id, 16); |
| 389 | buffer_put_int(&buffer, response_type); |
| 390 | |
| 391 | if (ssh_request_reply(auth, &buffer, &buffer) == 0) { |
| 392 | buffer_free(&buffer); |
| 393 | return 0; |
| 394 | } |
| 395 | type = buffer_get_char(&buffer); |
| 396 | |
| 397 | if (agent_failed(type)) { |
| 398 | logit("Agent admitted failure to authenticate using the key."); |
| 399 | } else if (type != SSH_AGENT_RSA_RESPONSE) { |
| 400 | fatal("Bad authentication response: %d", type); |
| 401 | } else { |
| 402 | success = 1; |
| 403 | /* |
| 404 | * Get the response from the packet. This will abort with a |
| 405 | * fatal error if the packet is corrupt. |
| 406 | */ |
| 407 | for (i = 0; i < 16; i++) |
| 408 | response[i] = (u_char)buffer_get_char(&buffer); |
| 409 | } |
| 410 | buffer_free(&buffer); |
| 411 | return success; |
| 412 | } |
| 413 | |
| 414 | /* ask agent to sign data, returns -1 on error, 0 on success */ |
| 415 | int |
| 416 | ssh_agent_sign(AuthenticationConnection *auth, |
| 417 | Key *key, |
| 418 | u_char **sigp, u_int *lenp, |
| 419 | u_char *data, u_int datalen) |
| 420 | { |
| 421 | extern int datafellows; |
| 422 | Buffer msg; |
| 423 | u_char *blob; |
| 424 | u_int blen; |
| 425 | int type, flags = 0; |
| 426 | int ret = -1; |
| 427 | |
| 428 | if (key_to_blob(key, &blob, &blen) == 0) |
| 429 | return -1; |
| 430 | |
| 431 | if (datafellows & SSH_BUG_SIGBLOB) |
| 432 | flags = SSH_AGENT_OLD_SIGNATURE; |
| 433 | |
| 434 | buffer_init(&msg); |
| 435 | buffer_put_char(&msg, SSH2_AGENTC_SIGN_REQUEST); |
| 436 | buffer_put_string(&msg, blob, blen); |
| 437 | buffer_put_string(&msg, data, datalen); |
| 438 | buffer_put_int(&msg, flags); |
| 439 | xfree(blob); |
| 440 | |
| 441 | if (ssh_request_reply(auth, &msg, &msg) == 0) { |
| 442 | buffer_free(&msg); |
| 443 | return -1; |
| 444 | } |
| 445 | type = buffer_get_char(&msg); |
| 446 | if (agent_failed(type)) { |
| 447 | logit("Agent admitted failure to sign using the key."); |
| 448 | } else if (type != SSH2_AGENT_SIGN_RESPONSE) { |
| 449 | fatal("Bad authentication response: %d", type); |
| 450 | } else { |
| 451 | ret = 0; |
| 452 | *sigp = buffer_get_string(&msg, lenp); |
| 453 | } |
| 454 | buffer_free(&msg); |
| 455 | return ret; |
| 456 | } |
| 457 | |
| 458 | /* Encode key for a message to the agent. */ |
| 459 | |
| 460 | static void |
| 461 | ssh_encode_identity_rsa1(Buffer *b, RSA *key, const char *comment) |
| 462 | { |
| 463 | buffer_put_int(b, BN_num_bits(key->n)); |
| 464 | buffer_put_bignum(b, key->n); |
| 465 | buffer_put_bignum(b, key->e); |
| 466 | buffer_put_bignum(b, key->d); |
| 467 | /* To keep within the protocol: p < q for ssh. in SSL p > q */ |
| 468 | buffer_put_bignum(b, key->iqmp); /* ssh key->u */ |
| 469 | buffer_put_bignum(b, key->q); /* ssh key->p, SSL key->q */ |
| 470 | buffer_put_bignum(b, key->p); /* ssh key->q, SSL key->p */ |
| 471 | buffer_put_cstring(b, comment); |
| 472 | } |
| 473 | |
| 474 | static void |
| 475 | ssh_encode_identity_ssh2(Buffer *b, Key *key, const char *comment) |
| 476 | { |
| 477 | buffer_put_cstring(b, key_ssh_name(key)); |
| 478 | switch (key->type) { |
| 479 | case KEY_RSA: |
| 480 | buffer_put_bignum2(b, key->rsa->n); |
| 481 | buffer_put_bignum2(b, key->rsa->e); |
| 482 | buffer_put_bignum2(b, key->rsa->d); |
| 483 | buffer_put_bignum2(b, key->rsa->iqmp); |
| 484 | buffer_put_bignum2(b, key->rsa->p); |
| 485 | buffer_put_bignum2(b, key->rsa->q); |
| 486 | break; |
| 487 | case KEY_RSA_CERT_V00: |
| 488 | case KEY_RSA_CERT: |
| 489 | if (key->cert == NULL || buffer_len(&key->cert->certblob) == 0) |
| 490 | fatal("%s: no cert/certblob", __func__); |
| 491 | buffer_put_string(b, buffer_ptr(&key->cert->certblob), |
| 492 | buffer_len(&key->cert->certblob)); |
| 493 | buffer_put_bignum2(b, key->rsa->d); |
| 494 | buffer_put_bignum2(b, key->rsa->iqmp); |
| 495 | buffer_put_bignum2(b, key->rsa->p); |
| 496 | buffer_put_bignum2(b, key->rsa->q); |
| 497 | break; |
| 498 | case KEY_DSA: |
| 499 | buffer_put_bignum2(b, key->dsa->p); |
| 500 | buffer_put_bignum2(b, key->dsa->q); |
| 501 | buffer_put_bignum2(b, key->dsa->g); |
| 502 | buffer_put_bignum2(b, key->dsa->pub_key); |
| 503 | buffer_put_bignum2(b, key->dsa->priv_key); |
| 504 | break; |
| 505 | case KEY_DSA_CERT_V00: |
| 506 | case KEY_DSA_CERT: |
| 507 | if (key->cert == NULL || buffer_len(&key->cert->certblob) == 0) |
| 508 | fatal("%s: no cert/certblob", __func__); |
| 509 | buffer_put_string(b, buffer_ptr(&key->cert->certblob), |
| 510 | buffer_len(&key->cert->certblob)); |
| 511 | buffer_put_bignum2(b, key->dsa->priv_key); |
| 512 | break; |
| 513 | #ifdef OPENSSL_HAS_ECC |
| 514 | case KEY_ECDSA: |
| 515 | buffer_put_cstring(b, key_curve_nid_to_name(key->ecdsa_nid)); |
| 516 | buffer_put_ecpoint(b, EC_KEY_get0_group(key->ecdsa), |
| 517 | EC_KEY_get0_public_key(key->ecdsa)); |
| 518 | buffer_put_bignum2(b, EC_KEY_get0_private_key(key->ecdsa)); |
| 519 | break; |
| 520 | case KEY_ECDSA_CERT: |
| 521 | if (key->cert == NULL || buffer_len(&key->cert->certblob) == 0) |
| 522 | fatal("%s: no cert/certblob", __func__); |
| 523 | buffer_put_string(b, buffer_ptr(&key->cert->certblob), |
| 524 | buffer_len(&key->cert->certblob)); |
| 525 | buffer_put_bignum2(b, EC_KEY_get0_private_key(key->ecdsa)); |
| 526 | break; |
| 527 | #endif |
| 528 | } |
| 529 | buffer_put_cstring(b, comment); |
| 530 | } |
| 531 | |
| 532 | /* |
| 533 | * Adds an identity to the authentication server. This call is not meant to |
| 534 | * be used by normal applications. |
| 535 | */ |
| 536 | |
| 537 | int |
| 538 | ssh_add_identity_constrained(AuthenticationConnection *auth, Key *key, |
| 539 | const char *comment, u_int life, u_int confirm) |
| 540 | { |
| 541 | Buffer msg; |
| 542 | int type, constrained = (life || confirm); |
| 543 | |
| 544 | buffer_init(&msg); |
| 545 | |
| 546 | switch (key->type) { |
| 547 | case KEY_RSA1: |
| 548 | type = constrained ? |
| 549 | SSH_AGENTC_ADD_RSA_ID_CONSTRAINED : |
| 550 | SSH_AGENTC_ADD_RSA_IDENTITY; |
| 551 | buffer_put_char(&msg, type); |
| 552 | ssh_encode_identity_rsa1(&msg, key->rsa, comment); |
| 553 | break; |
| 554 | case KEY_RSA: |
| 555 | case KEY_RSA_CERT: |
| 556 | case KEY_RSA_CERT_V00: |
| 557 | case KEY_DSA: |
| 558 | case KEY_DSA_CERT: |
| 559 | case KEY_DSA_CERT_V00: |
| 560 | case KEY_ECDSA: |
| 561 | case KEY_ECDSA_CERT: |
| 562 | type = constrained ? |
| 563 | SSH2_AGENTC_ADD_ID_CONSTRAINED : |
| 564 | SSH2_AGENTC_ADD_IDENTITY; |
| 565 | buffer_put_char(&msg, type); |
| 566 | ssh_encode_identity_ssh2(&msg, key, comment); |
| 567 | break; |
| 568 | default: |
| 569 | buffer_free(&msg); |
| 570 | return 0; |
| 571 | } |
| 572 | if (constrained) { |
| 573 | if (life != 0) { |
| 574 | buffer_put_char(&msg, SSH_AGENT_CONSTRAIN_LIFETIME); |
| 575 | buffer_put_int(&msg, life); |
| 576 | } |
| 577 | if (confirm != 0) |
| 578 | buffer_put_char(&msg, SSH_AGENT_CONSTRAIN_CONFIRM); |
| 579 | } |
| 580 | if (ssh_request_reply(auth, &msg, &msg) == 0) { |
| 581 | buffer_free(&msg); |
| 582 | return 0; |
| 583 | } |
| 584 | type = buffer_get_char(&msg); |
| 585 | buffer_free(&msg); |
| 586 | return decode_reply(type); |
| 587 | } |
| 588 | |
| 589 | /* |
| 590 | * Removes an identity from the authentication server. This call is not |
| 591 | * meant to be used by normal applications. |
| 592 | */ |
| 593 | |
| 594 | int |
| 595 | ssh_remove_identity(AuthenticationConnection *auth, Key *key) |
| 596 | { |
| 597 | Buffer msg; |
| 598 | int type; |
| 599 | u_char *blob; |
| 600 | u_int blen; |
| 601 | |
| 602 | buffer_init(&msg); |
| 603 | |
| 604 | if (key->type == KEY_RSA1) { |
| 605 | buffer_put_char(&msg, SSH_AGENTC_REMOVE_RSA_IDENTITY); |
| 606 | buffer_put_int(&msg, BN_num_bits(key->rsa->n)); |
| 607 | buffer_put_bignum(&msg, key->rsa->e); |
| 608 | buffer_put_bignum(&msg, key->rsa->n); |
| 609 | } else if (key_type_plain(key->type) == KEY_DSA || |
| 610 | key_type_plain(key->type) == KEY_RSA || |
| 611 | key_type_plain(key->type) == KEY_ECDSA) { |
| 612 | key_to_blob(key, &blob, &blen); |
| 613 | buffer_put_char(&msg, SSH2_AGENTC_REMOVE_IDENTITY); |
| 614 | buffer_put_string(&msg, blob, blen); |
| 615 | xfree(blob); |
| 616 | } else { |
| 617 | buffer_free(&msg); |
| 618 | return 0; |
| 619 | } |
| 620 | if (ssh_request_reply(auth, &msg, &msg) == 0) { |
| 621 | buffer_free(&msg); |
| 622 | return 0; |
| 623 | } |
| 624 | type = buffer_get_char(&msg); |
| 625 | buffer_free(&msg); |
| 626 | return decode_reply(type); |
| 627 | } |
| 628 | |
| 629 | int |
| 630 | ssh_update_card(AuthenticationConnection *auth, int add, |
| 631 | const char *reader_id, const char *pin, u_int life, u_int confirm) |
| 632 | { |
| 633 | Buffer msg; |
| 634 | int type, constrained = (life || confirm); |
| 635 | |
| 636 | if (add) { |
| 637 | type = constrained ? |
| 638 | SSH_AGENTC_ADD_SMARTCARD_KEY_CONSTRAINED : |
| 639 | SSH_AGENTC_ADD_SMARTCARD_KEY; |
| 640 | } else |
| 641 | type = SSH_AGENTC_REMOVE_SMARTCARD_KEY; |
| 642 | |
| 643 | buffer_init(&msg); |
| 644 | buffer_put_char(&msg, type); |
| 645 | buffer_put_cstring(&msg, reader_id); |
| 646 | buffer_put_cstring(&msg, pin); |
| 647 | |
| 648 | if (constrained) { |
| 649 | if (life != 0) { |
| 650 | buffer_put_char(&msg, SSH_AGENT_CONSTRAIN_LIFETIME); |
| 651 | buffer_put_int(&msg, life); |
| 652 | } |
| 653 | if (confirm != 0) |
| 654 | buffer_put_char(&msg, SSH_AGENT_CONSTRAIN_CONFIRM); |
| 655 | } |
| 656 | |
| 657 | if (ssh_request_reply(auth, &msg, &msg) == 0) { |
| 658 | buffer_free(&msg); |
| 659 | return 0; |
| 660 | } |
| 661 | type = buffer_get_char(&msg); |
| 662 | buffer_free(&msg); |
| 663 | return decode_reply(type); |
| 664 | } |
| 665 | |
| 666 | /* |
| 667 | * Removes all identities from the agent. This call is not meant to be used |
| 668 | * by normal applications. |
| 669 | */ |
| 670 | |
| 671 | int |
| 672 | ssh_remove_all_identities(AuthenticationConnection *auth, int version) |
| 673 | { |
| 674 | Buffer msg; |
| 675 | int type; |
| 676 | int code = (version==1) ? |
| 677 | SSH_AGENTC_REMOVE_ALL_RSA_IDENTITIES : |
| 678 | SSH2_AGENTC_REMOVE_ALL_IDENTITIES; |
| 679 | |
| 680 | buffer_init(&msg); |
| 681 | buffer_put_char(&msg, code); |
| 682 | |
| 683 | if (ssh_request_reply(auth, &msg, &msg) == 0) { |
| 684 | buffer_free(&msg); |
| 685 | return 0; |
| 686 | } |
| 687 | type = buffer_get_char(&msg); |
| 688 | buffer_free(&msg); |
| 689 | return decode_reply(type); |
| 690 | } |
| 691 | |
| 692 | int |
| 693 | decode_reply(int type) |
| 694 | { |
| 695 | switch (type) { |
| 696 | case SSH_AGENT_FAILURE: |
| 697 | case SSH_COM_AGENT2_FAILURE: |
| 698 | case SSH2_AGENT_FAILURE: |
| 699 | logit("SSH_AGENT_FAILURE"); |
| 700 | return 0; |
| 701 | case SSH_AGENT_SUCCESS: |
| 702 | return 1; |
| 703 | default: |
| 704 | fatal("Bad response from authentication agent: %d", type); |
| 705 | } |
| 706 | /* NOTREACHED */ |
| 707 | return 0; |
| 708 | } |