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a306f2dd | 1 | /* |
2 | * Copyright (c) 2000 Markus Friedl. All rights reserved. | |
3 | * | |
4 | * Redistribution and use in source and binary forms, with or without | |
5 | * modification, are permitted provided that the following conditions | |
6 | * are met: | |
7 | * 1. Redistributions of source code must retain the above copyright | |
8 | * notice, this list of conditions and the following disclaimer. | |
9 | * 2. Redistributions in binary form must reproduce the above copyright | |
10 | * notice, this list of conditions and the following disclaimer in the | |
11 | * documentation and/or other materials provided with the distribution. | |
a306f2dd | 12 | * |
13 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR | |
14 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES | |
15 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. | |
16 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, | |
17 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT | |
18 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, | |
19 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY | |
20 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | |
21 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF | |
22 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
23 | */ | |
24 | ||
25 | #include "includes.h" | |
1e3b8b07 | 26 | RCSID("$OpenBSD: sshconnect2.c,v 1.33 2000/12/20 19:37:22 markus Exp $"); |
a306f2dd | 27 | |
28 | #include <openssl/bn.h> | |
29 | #include <openssl/rsa.h> | |
30 | #include <openssl/dsa.h> | |
31 | #include <openssl/md5.h> | |
32 | #include <openssl/dh.h> | |
33 | #include <openssl/hmac.h> | |
34 | ||
35 | #include "ssh.h" | |
36 | #include "xmalloc.h" | |
37 | #include "rsa.h" | |
38 | #include "buffer.h" | |
39 | #include "packet.h" | |
a306f2dd | 40 | #include "uidswap.h" |
41 | #include "compat.h" | |
42 | #include "readconf.h" | |
43 | #include "bufaux.h" | |
44 | #include "ssh2.h" | |
45 | #include "kex.h" | |
46 | #include "myproposal.h" | |
47 | #include "key.h" | |
a306f2dd | 48 | #include "sshconnect.h" |
49 | #include "authfile.h" | |
94ec8c6b | 50 | #include "cli.h" |
188adeb2 | 51 | #include "dispatch.h" |
2e73a022 | 52 | #include "authfd.h" |
a306f2dd | 53 | |
94ec8c6b | 54 | void ssh_dh1_client(Kex *, char *, struct sockaddr *, Buffer *, Buffer *); |
55 | void ssh_dhgex_client(Kex *, char *, struct sockaddr *, Buffer *, Buffer *); | |
56 | ||
a306f2dd | 57 | /* import */ |
58 | extern char *client_version_string; | |
59 | extern char *server_version_string; | |
60 | extern Options options; | |
61 | ||
62 | /* | |
63 | * SSH2 key exchange | |
64 | */ | |
65 | ||
1e3b8b07 | 66 | u_char *session_id2 = NULL; |
a306f2dd | 67 | int session_id2_len = 0; |
68 | ||
69 | void | |
94ec8c6b | 70 | ssh_kex2(char *host, struct sockaddr *hostaddr) |
71 | { | |
72 | int i, plen; | |
73 | Kex *kex; | |
74 | Buffer *client_kexinit, *server_kexinit; | |
75 | char *sprop[PROPOSAL_MAX]; | |
76 | ||
c523303b | 77 | if (options.ciphers == (char *)-1) { |
78 | log("No valid ciphers for protocol version 2 given, using defaults."); | |
79 | options.ciphers = NULL; | |
94ec8c6b | 80 | } |
81 | if (options.ciphers != NULL) { | |
82 | myproposal[PROPOSAL_ENC_ALGS_CTOS] = | |
83 | myproposal[PROPOSAL_ENC_ALGS_STOC] = options.ciphers; | |
84 | } | |
85 | if (options.compression) { | |
86 | myproposal[PROPOSAL_COMP_ALGS_CTOS] = "zlib"; | |
87 | myproposal[PROPOSAL_COMP_ALGS_STOC] = "zlib"; | |
88 | } else { | |
89 | myproposal[PROPOSAL_COMP_ALGS_CTOS] = "none"; | |
90 | myproposal[PROPOSAL_COMP_ALGS_STOC] = "none"; | |
91 | } | |
92 | ||
93 | /* buffers with raw kexinit messages */ | |
94 | server_kexinit = xmalloc(sizeof(*server_kexinit)); | |
95 | buffer_init(server_kexinit); | |
96 | client_kexinit = kex_init(myproposal); | |
97 | ||
98 | /* algorithm negotiation */ | |
99 | kex_exchange_kexinit(client_kexinit, server_kexinit, sprop); | |
100 | kex = kex_choose_conf(myproposal, sprop, 0); | |
101 | for (i = 0; i < PROPOSAL_MAX; i++) | |
102 | xfree(sprop[i]); | |
103 | ||
104 | /* server authentication and session key agreement */ | |
105 | switch(kex->kex_type) { | |
106 | case DH_GRP1_SHA1: | |
107 | ssh_dh1_client(kex, host, hostaddr, | |
108 | client_kexinit, server_kexinit); | |
109 | break; | |
110 | case DH_GEX_SHA1: | |
111 | ssh_dhgex_client(kex, host, hostaddr, client_kexinit, | |
112 | server_kexinit); | |
113 | break; | |
114 | default: | |
115 | fatal("Unsupported key exchange %d", kex->kex_type); | |
116 | } | |
117 | ||
118 | buffer_free(client_kexinit); | |
119 | buffer_free(server_kexinit); | |
120 | xfree(client_kexinit); | |
121 | xfree(server_kexinit); | |
122 | ||
123 | debug("Wait SSH2_MSG_NEWKEYS."); | |
124 | packet_read_expect(&plen, SSH2_MSG_NEWKEYS); | |
125 | packet_done(); | |
126 | debug("GOT SSH2_MSG_NEWKEYS."); | |
127 | ||
128 | debug("send SSH2_MSG_NEWKEYS."); | |
129 | packet_start(SSH2_MSG_NEWKEYS); | |
130 | packet_send(); | |
131 | packet_write_wait(); | |
132 | debug("done: send SSH2_MSG_NEWKEYS."); | |
133 | ||
134 | #ifdef DEBUG_KEXDH | |
135 | /* send 1st encrypted/maced/compressed message */ | |
136 | packet_start(SSH2_MSG_IGNORE); | |
137 | packet_put_cstring("markus"); | |
138 | packet_send(); | |
139 | packet_write_wait(); | |
140 | #endif | |
141 | debug("done: KEX2."); | |
142 | } | |
143 | ||
144 | /* diffie-hellman-group1-sha1 */ | |
145 | ||
146 | void | |
147 | ssh_dh1_client(Kex *kex, char *host, struct sockaddr *hostaddr, | |
148 | Buffer *client_kexinit, Buffer *server_kexinit) | |
a306f2dd | 149 | { |
188adeb2 | 150 | #ifdef DEBUG_KEXDH |
151 | int i; | |
152 | #endif | |
71276795 | 153 | int plen, dlen; |
1e3b8b07 | 154 | u_int klen, kout; |
a306f2dd | 155 | char *signature = NULL; |
1e3b8b07 | 156 | u_int slen; |
a306f2dd | 157 | char *server_host_key_blob = NULL; |
158 | Key *server_host_key; | |
1e3b8b07 | 159 | u_int sbloblen; |
a306f2dd | 160 | DH *dh; |
161 | BIGNUM *dh_server_pub = 0; | |
162 | BIGNUM *shared_secret = 0; | |
1e3b8b07 | 163 | u_char *kbuf; |
164 | u_char *hash; | |
a306f2dd | 165 | |
a306f2dd | 166 | debug("Sending SSH2_MSG_KEXDH_INIT."); |
a306f2dd | 167 | /* generate and send 'e', client DH public key */ |
168 | dh = dh_new_group1(); | |
3e1caa83 | 169 | dh_gen_key(dh); |
a306f2dd | 170 | packet_start(SSH2_MSG_KEXDH_INIT); |
171 | packet_put_bignum2(dh->pub_key); | |
172 | packet_send(); | |
173 | packet_write_wait(); | |
174 | ||
175 | #ifdef DEBUG_KEXDH | |
176 | fprintf(stderr, "\np= "); | |
188adeb2 | 177 | BN_print_fp(stderr, dh->p); |
a306f2dd | 178 | fprintf(stderr, "\ng= "); |
188adeb2 | 179 | BN_print_fp(stderr, dh->g); |
a306f2dd | 180 | fprintf(stderr, "\npub= "); |
188adeb2 | 181 | BN_print_fp(stderr, dh->pub_key); |
a306f2dd | 182 | fprintf(stderr, "\n"); |
183 | DHparams_print_fp(stderr, dh); | |
184 | #endif | |
185 | ||
186 | debug("Wait SSH2_MSG_KEXDH_REPLY."); | |
187 | ||
71276795 | 188 | packet_read_expect(&plen, SSH2_MSG_KEXDH_REPLY); |
a306f2dd | 189 | |
190 | debug("Got SSH2_MSG_KEXDH_REPLY."); | |
191 | ||
192 | /* key, cert */ | |
193 | server_host_key_blob = packet_get_string(&sbloblen); | |
fa08c86b | 194 | server_host_key = key_from_blob(server_host_key_blob, sbloblen); |
a306f2dd | 195 | if (server_host_key == NULL) |
196 | fatal("cannot decode server_host_key_blob"); | |
197 | ||
198 | check_host_key(host, hostaddr, server_host_key, | |
94ec8c6b | 199 | options.user_hostfile2, options.system_hostfile2); |
a306f2dd | 200 | |
201 | /* DH paramter f, server public DH key */ | |
202 | dh_server_pub = BN_new(); | |
203 | if (dh_server_pub == NULL) | |
204 | fatal("dh_server_pub == NULL"); | |
205 | packet_get_bignum2(dh_server_pub, &dlen); | |
206 | ||
207 | #ifdef DEBUG_KEXDH | |
208 | fprintf(stderr, "\ndh_server_pub= "); | |
188adeb2 | 209 | BN_print_fp(stderr, dh_server_pub); |
a306f2dd | 210 | fprintf(stderr, "\n"); |
211 | debug("bits %d", BN_num_bits(dh_server_pub)); | |
212 | #endif | |
213 | ||
214 | /* signed H */ | |
215 | signature = packet_get_string(&slen); | |
216 | packet_done(); | |
217 | ||
218 | if (!dh_pub_is_valid(dh, dh_server_pub)) | |
219 | packet_disconnect("bad server public DH value"); | |
220 | ||
221 | klen = DH_size(dh); | |
222 | kbuf = xmalloc(klen); | |
223 | kout = DH_compute_key(kbuf, dh_server_pub, dh); | |
224 | #ifdef DEBUG_KEXDH | |
225 | debug("shared secret: len %d/%d", klen, kout); | |
226 | fprintf(stderr, "shared secret == "); | |
227 | for (i = 0; i< kout; i++) | |
228 | fprintf(stderr, "%02x", (kbuf[i])&0xff); | |
229 | fprintf(stderr, "\n"); | |
230 | #endif | |
231 | shared_secret = BN_new(); | |
232 | ||
233 | BN_bin2bn(kbuf, kout, shared_secret); | |
234 | memset(kbuf, 0, klen); | |
235 | xfree(kbuf); | |
236 | ||
237 | /* calc and verify H */ | |
238 | hash = kex_hash( | |
239 | client_version_string, | |
240 | server_version_string, | |
241 | buffer_ptr(client_kexinit), buffer_len(client_kexinit), | |
242 | buffer_ptr(server_kexinit), buffer_len(server_kexinit), | |
243 | server_host_key_blob, sbloblen, | |
244 | dh->pub_key, | |
245 | dh_server_pub, | |
246 | shared_secret | |
247 | ); | |
248 | xfree(server_host_key_blob); | |
71276795 | 249 | DH_free(dh); |
a306f2dd | 250 | #ifdef DEBUG_KEXDH |
251 | fprintf(stderr, "hash == "); | |
252 | for (i = 0; i< 20; i++) | |
253 | fprintf(stderr, "%02x", (hash[i])&0xff); | |
254 | fprintf(stderr, "\n"); | |
255 | #endif | |
1e3b8b07 | 256 | if (key_verify(server_host_key, (u_char *)signature, slen, hash, 20) != 1) |
fa08c86b | 257 | fatal("key_verify failed for server_host_key"); |
a306f2dd | 258 | key_free(server_host_key); |
259 | ||
260 | kex_derive_keys(kex, hash, shared_secret); | |
261 | packet_set_kex(kex); | |
262 | ||
a306f2dd | 263 | /* save session id */ |
264 | session_id2_len = 20; | |
265 | session_id2 = xmalloc(session_id2_len); | |
266 | memcpy(session_id2, hash, session_id2_len); | |
71276795 | 267 | } |
268 | ||
94ec8c6b | 269 | /* diffie-hellman-group-exchange-sha1 */ |
270 | ||
271 | /* | |
272 | * Estimates the group order for a Diffie-Hellman group that has an | |
273 | * attack complexity approximately the same as O(2**bits). Estimate | |
274 | * with: O(exp(1.9223 * (ln q)^(1/3) (ln ln q)^(2/3))) | |
275 | */ | |
276 | ||
277 | int | |
278 | dh_estimate(int bits) | |
279 | { | |
280 | ||
281 | if (bits < 64) | |
282 | return (512); /* O(2**63) */ | |
283 | if (bits < 128) | |
284 | return (1024); /* O(2**86) */ | |
285 | if (bits < 192) | |
286 | return (2048); /* O(2**116) */ | |
287 | return (4096); /* O(2**156) */ | |
288 | } | |
289 | ||
71276795 | 290 | void |
94ec8c6b | 291 | ssh_dhgex_client(Kex *kex, char *host, struct sockaddr *hostaddr, |
292 | Buffer *client_kexinit, Buffer *server_kexinit) | |
71276795 | 293 | { |
94ec8c6b | 294 | #ifdef DEBUG_KEXDH |
295 | int i; | |
296 | #endif | |
297 | int plen, dlen; | |
1e3b8b07 | 298 | u_int klen, kout; |
94ec8c6b | 299 | char *signature = NULL; |
1e3b8b07 | 300 | u_int slen, nbits; |
94ec8c6b | 301 | char *server_host_key_blob = NULL; |
302 | Key *server_host_key; | |
1e3b8b07 | 303 | u_int sbloblen; |
94ec8c6b | 304 | DH *dh; |
305 | BIGNUM *dh_server_pub = 0; | |
306 | BIGNUM *shared_secret = 0; | |
307 | BIGNUM *p = 0, *g = 0; | |
1e3b8b07 | 308 | u_char *kbuf; |
309 | u_char *hash; | |
71276795 | 310 | |
94ec8c6b | 311 | nbits = dh_estimate(kex->enc[MODE_OUT].cipher->key_len * 8); |
71276795 | 312 | |
94ec8c6b | 313 | debug("Sending SSH2_MSG_KEX_DH_GEX_REQUEST."); |
314 | packet_start(SSH2_MSG_KEX_DH_GEX_REQUEST); | |
315 | packet_put_int(nbits); | |
316 | packet_send(); | |
317 | packet_write_wait(); | |
71276795 | 318 | |
94ec8c6b | 319 | #ifdef DEBUG_KEXDH |
320 | fprintf(stderr, "\nnbits = %d", nbits); | |
321 | #endif | |
71276795 | 322 | |
94ec8c6b | 323 | debug("Wait SSH2_MSG_KEX_DH_GEX_GROUP."); |
71276795 | 324 | |
94ec8c6b | 325 | packet_read_expect(&plen, SSH2_MSG_KEX_DH_GEX_GROUP); |
a306f2dd | 326 | |
94ec8c6b | 327 | debug("Got SSH2_MSG_KEX_DH_GEX_GROUP."); |
a306f2dd | 328 | |
94ec8c6b | 329 | if ((p = BN_new()) == NULL) |
330 | fatal("BN_new"); | |
331 | packet_get_bignum2(p, &dlen); | |
332 | if ((g = BN_new()) == NULL) | |
333 | fatal("BN_new"); | |
334 | packet_get_bignum2(g, &dlen); | |
335 | if ((dh = dh_new_group(g, p)) == NULL) | |
336 | fatal("dh_new_group"); | |
a306f2dd | 337 | |
3e1caa83 | 338 | dh_gen_key(dh); |
339 | ||
a306f2dd | 340 | #ifdef DEBUG_KEXDH |
94ec8c6b | 341 | fprintf(stderr, "\np= "); |
342 | BN_print_fp(stderr, dh->p); | |
343 | fprintf(stderr, "\ng= "); | |
344 | BN_print_fp(stderr, dh->g); | |
345 | fprintf(stderr, "\npub= "); | |
346 | BN_print_fp(stderr, dh->pub_key); | |
347 | fprintf(stderr, "\n"); | |
348 | DHparams_print_fp(stderr, dh); | |
349 | #endif | |
350 | ||
351 | debug("Sending SSH2_MSG_KEX_DH_GEX_INIT."); | |
352 | /* generate and send 'e', client DH public key */ | |
353 | packet_start(SSH2_MSG_KEX_DH_GEX_INIT); | |
354 | packet_put_bignum2(dh->pub_key); | |
a306f2dd | 355 | packet_send(); |
356 | packet_write_wait(); | |
94ec8c6b | 357 | |
358 | debug("Wait SSH2_MSG_KEX_DH_GEX_REPLY."); | |
359 | ||
360 | packet_read_expect(&plen, SSH2_MSG_KEX_DH_GEX_REPLY); | |
361 | ||
362 | debug("Got SSH2_MSG_KEXDH_REPLY."); | |
363 | ||
364 | /* key, cert */ | |
365 | server_host_key_blob = packet_get_string(&sbloblen); | |
fa08c86b | 366 | server_host_key = key_from_blob(server_host_key_blob, sbloblen); |
94ec8c6b | 367 | if (server_host_key == NULL) |
368 | fatal("cannot decode server_host_key_blob"); | |
369 | ||
370 | check_host_key(host, hostaddr, server_host_key, | |
371 | options.user_hostfile2, options.system_hostfile2); | |
372 | ||
373 | /* DH paramter f, server public DH key */ | |
374 | dh_server_pub = BN_new(); | |
375 | if (dh_server_pub == NULL) | |
376 | fatal("dh_server_pub == NULL"); | |
377 | packet_get_bignum2(dh_server_pub, &dlen); | |
378 | ||
379 | #ifdef DEBUG_KEXDH | |
380 | fprintf(stderr, "\ndh_server_pub= "); | |
381 | BN_print_fp(stderr, dh_server_pub); | |
382 | fprintf(stderr, "\n"); | |
383 | debug("bits %d", BN_num_bits(dh_server_pub)); | |
a306f2dd | 384 | #endif |
94ec8c6b | 385 | |
386 | /* signed H */ | |
387 | signature = packet_get_string(&slen); | |
388 | packet_done(); | |
389 | ||
390 | if (!dh_pub_is_valid(dh, dh_server_pub)) | |
391 | packet_disconnect("bad server public DH value"); | |
392 | ||
393 | klen = DH_size(dh); | |
394 | kbuf = xmalloc(klen); | |
395 | kout = DH_compute_key(kbuf, dh_server_pub, dh); | |
396 | #ifdef DEBUG_KEXDH | |
397 | debug("shared secret: len %d/%d", klen, kout); | |
398 | fprintf(stderr, "shared secret == "); | |
399 | for (i = 0; i< kout; i++) | |
400 | fprintf(stderr, "%02x", (kbuf[i])&0xff); | |
401 | fprintf(stderr, "\n"); | |
402 | #endif | |
403 | shared_secret = BN_new(); | |
404 | ||
405 | BN_bin2bn(kbuf, kout, shared_secret); | |
406 | memset(kbuf, 0, klen); | |
407 | xfree(kbuf); | |
408 | ||
409 | /* calc and verify H */ | |
410 | hash = kex_hash_gex( | |
411 | client_version_string, | |
412 | server_version_string, | |
413 | buffer_ptr(client_kexinit), buffer_len(client_kexinit), | |
414 | buffer_ptr(server_kexinit), buffer_len(server_kexinit), | |
415 | server_host_key_blob, sbloblen, | |
416 | nbits, dh->p, dh->g, | |
417 | dh->pub_key, | |
418 | dh_server_pub, | |
419 | shared_secret | |
420 | ); | |
421 | xfree(server_host_key_blob); | |
422 | DH_free(dh); | |
423 | #ifdef DEBUG_KEXDH | |
424 | fprintf(stderr, "hash == "); | |
425 | for (i = 0; i< 20; i++) | |
426 | fprintf(stderr, "%02x", (hash[i])&0xff); | |
427 | fprintf(stderr, "\n"); | |
428 | #endif | |
1e3b8b07 | 429 | if (key_verify(server_host_key, (u_char *)signature, slen, hash, 20) != 1) |
fa08c86b | 430 | fatal("key_verify failed for server_host_key"); |
94ec8c6b | 431 | key_free(server_host_key); |
432 | ||
433 | kex_derive_keys(kex, hash, shared_secret); | |
434 | packet_set_kex(kex); | |
435 | ||
436 | /* save session id */ | |
437 | session_id2_len = 20; | |
438 | session_id2 = xmalloc(session_id2_len); | |
439 | memcpy(session_id2, hash, session_id2_len); | |
a306f2dd | 440 | } |
71276795 | 441 | |
a306f2dd | 442 | /* |
443 | * Authenticate user | |
444 | */ | |
188adeb2 | 445 | |
446 | typedef struct Authctxt Authctxt; | |
447 | typedef struct Authmethod Authmethod; | |
448 | ||
449 | typedef int sign_cb_fn( | |
450 | Authctxt *authctxt, Key *key, | |
1e3b8b07 | 451 | u_char **sigp, int *lenp, u_char *data, int datalen); |
188adeb2 | 452 | |
453 | struct Authctxt { | |
454 | const char *server_user; | |
455 | const char *host; | |
456 | const char *service; | |
457 | AuthenticationConnection *agent; | |
188adeb2 | 458 | Authmethod *method; |
94ec8c6b | 459 | int success; |
188adeb2 | 460 | }; |
461 | struct Authmethod { | |
462 | char *name; /* string to compare against server's list */ | |
463 | int (*userauth)(Authctxt *authctxt); | |
464 | int *enabled; /* flag in option struct that enables method */ | |
465 | int *batch_flag; /* flag in option struct that disables method */ | |
466 | }; | |
467 | ||
468 | void input_userauth_success(int type, int plen, void *ctxt); | |
469 | void input_userauth_failure(int type, int plen, void *ctxt); | |
470 | void input_userauth_error(int type, int plen, void *ctxt); | |
94ec8c6b | 471 | void input_userauth_info_req(int type, int plen, void *ctxt); |
472 | ||
473 | int userauth_none(Authctxt *authctxt); | |
188adeb2 | 474 | int userauth_pubkey(Authctxt *authctxt); |
475 | int userauth_passwd(Authctxt *authctxt); | |
94ec8c6b | 476 | int userauth_kbdint(Authctxt *authctxt); |
188adeb2 | 477 | |
1e3b8b07 | 478 | void authmethod_clear(void); |
94ec8c6b | 479 | Authmethod *authmethod_get(char *authlist); |
480 | Authmethod *authmethod_lookup(const char *name); | |
188adeb2 | 481 | |
482 | Authmethod authmethods[] = { | |
483 | {"publickey", | |
484 | userauth_pubkey, | |
fa08c86b | 485 | &options.pubkey_authentication, |
188adeb2 | 486 | NULL}, |
487 | {"password", | |
488 | userauth_passwd, | |
489 | &options.password_authentication, | |
490 | &options.batch_mode}, | |
94ec8c6b | 491 | {"keyboard-interactive", |
492 | userauth_kbdint, | |
493 | &options.kbd_interactive_authentication, | |
494 | &options.batch_mode}, | |
495 | {"none", | |
496 | userauth_none, | |
497 | NULL, | |
498 | NULL}, | |
188adeb2 | 499 | {NULL, NULL, NULL, NULL} |
500 | }; | |
501 | ||
502 | void | |
503 | ssh_userauth2(const char *server_user, char *host) | |
504 | { | |
505 | Authctxt authctxt; | |
506 | int type; | |
507 | int plen; | |
508 | ||
509 | debug("send SSH2_MSG_SERVICE_REQUEST"); | |
510 | packet_start(SSH2_MSG_SERVICE_REQUEST); | |
511 | packet_put_cstring("ssh-userauth"); | |
512 | packet_send(); | |
513 | packet_write_wait(); | |
514 | type = packet_read(&plen); | |
515 | if (type != SSH2_MSG_SERVICE_ACCEPT) { | |
516 | fatal("denied SSH2_MSG_SERVICE_ACCEPT: %d", type); | |
517 | } | |
518 | if (packet_remaining() > 0) { | |
519 | char *reply = packet_get_string(&plen); | |
520 | debug("service_accept: %s", reply); | |
521 | xfree(reply); | |
522 | packet_done(); | |
523 | } else { | |
524 | debug("buggy server: service_accept w/o service"); | |
525 | } | |
526 | packet_done(); | |
527 | debug("got SSH2_MSG_SERVICE_ACCEPT"); | |
528 | ||
529 | /* setup authentication context */ | |
530 | authctxt.agent = ssh_get_authentication_connection(); | |
531 | authctxt.server_user = server_user; | |
532 | authctxt.host = host; | |
533 | authctxt.service = "ssh-connection"; /* service name */ | |
534 | authctxt.success = 0; | |
94ec8c6b | 535 | authctxt.method = authmethod_lookup("none"); |
536 | if (authctxt.method == NULL) | |
537 | fatal("ssh_userauth2: internal error: cannot send userauth none request"); | |
538 | authmethod_clear(); | |
188adeb2 | 539 | |
540 | /* initial userauth request */ | |
94ec8c6b | 541 | userauth_none(&authctxt); |
188adeb2 | 542 | |
543 | dispatch_init(&input_userauth_error); | |
544 | dispatch_set(SSH2_MSG_USERAUTH_SUCCESS, &input_userauth_success); | |
545 | dispatch_set(SSH2_MSG_USERAUTH_FAILURE, &input_userauth_failure); | |
546 | dispatch_run(DISPATCH_BLOCK, &authctxt.success, &authctxt); /* loop until success */ | |
547 | ||
548 | if (authctxt.agent != NULL) | |
549 | ssh_close_authentication_connection(authctxt.agent); | |
550 | ||
94ec8c6b | 551 | debug("ssh-userauth2 successfull: method %s", authctxt.method->name); |
188adeb2 | 552 | } |
553 | void | |
554 | input_userauth_error(int type, int plen, void *ctxt) | |
555 | { | |
556 | fatal("input_userauth_error: bad message during authentication"); | |
557 | } | |
558 | void | |
559 | input_userauth_success(int type, int plen, void *ctxt) | |
560 | { | |
561 | Authctxt *authctxt = ctxt; | |
562 | if (authctxt == NULL) | |
563 | fatal("input_userauth_success: no authentication context"); | |
564 | authctxt->success = 1; /* break out */ | |
565 | } | |
566 | void | |
567 | input_userauth_failure(int type, int plen, void *ctxt) | |
568 | { | |
569 | Authmethod *method = NULL; | |
570 | Authctxt *authctxt = ctxt; | |
571 | char *authlist = NULL; | |
572 | int partial; | |
188adeb2 | 573 | |
574 | if (authctxt == NULL) | |
575 | fatal("input_userauth_failure: no authentication context"); | |
576 | ||
94ec8c6b | 577 | authlist = packet_get_string(NULL); |
188adeb2 | 578 | partial = packet_get_char(); |
579 | packet_done(); | |
580 | ||
581 | if (partial != 0) | |
582 | debug("partial success"); | |
583 | debug("authentications that can continue: %s", authlist); | |
584 | ||
585 | for (;;) { | |
188adeb2 | 586 | method = authmethod_get(authlist); |
587 | if (method == NULL) | |
588 | fatal("Unable to find an authentication method"); | |
94ec8c6b | 589 | authctxt->method = method; |
188adeb2 | 590 | if (method->userauth(authctxt) != 0) { |
94ec8c6b | 591 | debug2("we sent a %s packet, wait for reply", method->name); |
188adeb2 | 592 | break; |
593 | } else { | |
594 | debug2("we did not send a packet, disable method"); | |
595 | method->enabled = NULL; | |
596 | } | |
597 | } | |
598 | xfree(authlist); | |
599 | } | |
600 | ||
94ec8c6b | 601 | int |
602 | userauth_none(Authctxt *authctxt) | |
603 | { | |
604 | /* initial userauth request */ | |
605 | packet_start(SSH2_MSG_USERAUTH_REQUEST); | |
606 | packet_put_cstring(authctxt->server_user); | |
607 | packet_put_cstring(authctxt->service); | |
608 | packet_put_cstring(authctxt->method->name); | |
609 | packet_send(); | |
610 | packet_write_wait(); | |
611 | return 1; | |
612 | } | |
613 | ||
a306f2dd | 614 | int |
188adeb2 | 615 | userauth_passwd(Authctxt *authctxt) |
a306f2dd | 616 | { |
1d1ffb87 | 617 | static int attempt = 0; |
a306f2dd | 618 | char prompt[80]; |
619 | char *password; | |
620 | ||
fa649821 | 621 | if (attempt++ >= options.number_of_password_prompts) |
1d1ffb87 | 622 | return 0; |
623 | ||
fa649821 | 624 | if(attempt != 1) |
625 | error("Permission denied, please try again."); | |
626 | ||
a306f2dd | 627 | snprintf(prompt, sizeof(prompt), "%.30s@%.40s's password: ", |
188adeb2 | 628 | authctxt->server_user, authctxt->host); |
a306f2dd | 629 | password = read_passphrase(prompt, 0); |
630 | packet_start(SSH2_MSG_USERAUTH_REQUEST); | |
188adeb2 | 631 | packet_put_cstring(authctxt->server_user); |
632 | packet_put_cstring(authctxt->service); | |
94ec8c6b | 633 | packet_put_cstring(authctxt->method->name); |
a306f2dd | 634 | packet_put_char(0); |
635 | packet_put_cstring(password); | |
636 | memset(password, 0, strlen(password)); | |
637 | xfree(password); | |
638 | packet_send(); | |
639 | packet_write_wait(); | |
640 | return 1; | |
641 | } | |
642 | ||
2e73a022 | 643 | int |
188adeb2 | 644 | sign_and_send_pubkey(Authctxt *authctxt, Key *k, sign_cb_fn *sign_callback) |
a306f2dd | 645 | { |
646 | Buffer b; | |
1e3b8b07 | 647 | u_char *blob, *signature; |
a306f2dd | 648 | int bloblen, slen; |
74fc9186 | 649 | int skip = 0; |
2e73a022 | 650 | int ret = -1; |
94ec8c6b | 651 | int have_sig = 1; |
a306f2dd | 652 | |
cbc5abf9 | 653 | debug3("sign_and_send_pubkey"); |
fa08c86b | 654 | if (key_to_blob(k, &blob, &bloblen) == 0) { |
655 | /* we cannot handle this key */ | |
cbc5abf9 | 656 | debug3("sign_and_send_pubkey: cannot handle key"); |
fa08c86b | 657 | return 0; |
658 | } | |
a306f2dd | 659 | /* data to be signed */ |
660 | buffer_init(&b); | |
33de75a3 | 661 | if (datafellows & SSH_OLD_SESSIONID) { |
74fc9186 | 662 | buffer_append(&b, session_id2, session_id2_len); |
663 | skip = session_id2_len; | |
33de75a3 | 664 | } else { |
665 | buffer_put_string(&b, session_id2, session_id2_len); | |
666 | skip = buffer_len(&b); | |
74fc9186 | 667 | } |
a306f2dd | 668 | buffer_put_char(&b, SSH2_MSG_USERAUTH_REQUEST); |
188adeb2 | 669 | buffer_put_cstring(&b, authctxt->server_user); |
d0c832f3 | 670 | buffer_put_cstring(&b, |
cbc5abf9 | 671 | datafellows & SSH_BUG_PKSERVICE ? |
d0c832f3 | 672 | "ssh-userauth" : |
188adeb2 | 673 | authctxt->service); |
cbc5abf9 | 674 | if (datafellows & SSH_BUG_PKAUTH) { |
675 | buffer_put_char(&b, have_sig); | |
676 | } else { | |
677 | buffer_put_cstring(&b, authctxt->method->name); | |
678 | buffer_put_char(&b, have_sig); | |
679 | buffer_put_cstring(&b, key_ssh_name(k)); | |
680 | } | |
a306f2dd | 681 | buffer_put_string(&b, blob, bloblen); |
a306f2dd | 682 | |
683 | /* generate signature */ | |
188adeb2 | 684 | ret = (*sign_callback)(authctxt, k, &signature, &slen, buffer_ptr(&b), buffer_len(&b)); |
2e73a022 | 685 | if (ret == -1) { |
686 | xfree(blob); | |
687 | buffer_free(&b); | |
688 | return 0; | |
689 | } | |
fa08c86b | 690 | #ifdef DEBUG_PK |
a306f2dd | 691 | buffer_dump(&b); |
692 | #endif | |
cbc5abf9 | 693 | if (datafellows & SSH_BUG_PKSERVICE) { |
d0c832f3 | 694 | buffer_clear(&b); |
695 | buffer_append(&b, session_id2, session_id2_len); | |
696 | buffer_put_char(&b, SSH2_MSG_USERAUTH_REQUEST); | |
188adeb2 | 697 | buffer_put_cstring(&b, authctxt->server_user); |
698 | buffer_put_cstring(&b, authctxt->service); | |
94ec8c6b | 699 | buffer_put_cstring(&b, authctxt->method->name); |
700 | buffer_put_char(&b, have_sig); | |
cbc5abf9 | 701 | if (!(datafellows & SSH_BUG_PKAUTH)) |
702 | buffer_put_cstring(&b, key_ssh_name(k)); | |
d0c832f3 | 703 | buffer_put_string(&b, blob, bloblen); |
704 | } | |
705 | xfree(blob); | |
a306f2dd | 706 | /* append signature */ |
707 | buffer_put_string(&b, signature, slen); | |
708 | xfree(signature); | |
709 | ||
710 | /* skip session id and packet type */ | |
74fc9186 | 711 | if (buffer_len(&b) < skip + 1) |
188adeb2 | 712 | fatal("userauth_pubkey: internal error"); |
74fc9186 | 713 | buffer_consume(&b, skip + 1); |
a306f2dd | 714 | |
715 | /* put remaining data from buffer into packet */ | |
716 | packet_start(SSH2_MSG_USERAUTH_REQUEST); | |
717 | packet_put_raw(buffer_ptr(&b), buffer_len(&b)); | |
718 | buffer_free(&b); | |
719 | ||
720 | /* send */ | |
721 | packet_send(); | |
722 | packet_write_wait(); | |
2e73a022 | 723 | |
724 | return 1; | |
4c8722d9 | 725 | } |
726 | ||
188adeb2 | 727 | /* sign callback */ |
1e3b8b07 | 728 | int key_sign_cb(Authctxt *authctxt, Key *key, u_char **sigp, int *lenp, |
729 | u_char *data, int datalen) | |
188adeb2 | 730 | { |
fa08c86b | 731 | return key_sign(key, sigp, lenp, data, datalen); |
188adeb2 | 732 | } |
733 | ||
4c8722d9 | 734 | int |
188adeb2 | 735 | userauth_pubkey_identity(Authctxt *authctxt, char *filename) |
4c8722d9 | 736 | { |
737 | Key *k; | |
188adeb2 | 738 | int i, ret, try_next; |
4c8722d9 | 739 | struct stat st; |
740 | ||
741 | if (stat(filename, &st) != 0) { | |
742 | debug("key does not exist: %s", filename); | |
743 | return 0; | |
744 | } | |
745 | debug("try pubkey: %s", filename); | |
746 | ||
fa08c86b | 747 | k = key_new(KEY_UNSPEC); |
4c8722d9 | 748 | if (!load_private_key(filename, "", k, NULL)) { |
749 | int success = 0; | |
750 | char *passphrase; | |
751 | char prompt[300]; | |
752 | snprintf(prompt, sizeof prompt, | |
fa08c86b | 753 | "Enter passphrase for key '%.100s': ", filename); |
188adeb2 | 754 | for (i = 0; i < options.number_of_password_prompts; i++) { |
755 | passphrase = read_passphrase(prompt, 0); | |
756 | if (strcmp(passphrase, "") != 0) { | |
757 | success = load_private_key(filename, passphrase, k, NULL); | |
758 | try_next = 0; | |
759 | } else { | |
760 | debug2("no passphrase given, try next key"); | |
761 | try_next = 1; | |
762 | } | |
763 | memset(passphrase, 0, strlen(passphrase)); | |
764 | xfree(passphrase); | |
765 | if (success || try_next) | |
766 | break; | |
767 | debug2("bad passphrase given, try again..."); | |
768 | } | |
4c8722d9 | 769 | if (!success) { |
770 | key_free(k); | |
771 | return 0; | |
772 | } | |
773 | } | |
fa08c86b | 774 | ret = sign_and_send_pubkey(authctxt, k, key_sign_cb); |
2e73a022 | 775 | key_free(k); |
776 | return ret; | |
777 | } | |
778 | ||
188adeb2 | 779 | /* sign callback */ |
1e3b8b07 | 780 | int agent_sign_cb(Authctxt *authctxt, Key *key, u_char **sigp, int *lenp, |
781 | u_char *data, int datalen) | |
2e73a022 | 782 | { |
188adeb2 | 783 | return ssh_agent_sign(authctxt->agent, key, sigp, lenp, data, datalen); |
2e73a022 | 784 | } |
785 | ||
786 | int | |
188adeb2 | 787 | userauth_pubkey_agent(Authctxt *authctxt) |
2e73a022 | 788 | { |
789 | static int called = 0; | |
fa08c86b | 790 | int ret = 0; |
2e73a022 | 791 | char *comment; |
792 | Key *k; | |
2e73a022 | 793 | |
794 | if (called == 0) { | |
fa08c86b | 795 | if (ssh_get_num_identities(authctxt->agent, 2) == 0) |
796 | debug2("userauth_pubkey_agent: no keys at all"); | |
188adeb2 | 797 | called = 1; |
2e73a022 | 798 | } |
fa08c86b | 799 | k = ssh_get_next_identity(authctxt->agent, &comment, 2); |
188adeb2 | 800 | if (k == NULL) { |
fa08c86b | 801 | debug2("userauth_pubkey_agent: no more keys"); |
802 | } else { | |
803 | debug("userauth_pubkey_agent: trying agent key %s", comment); | |
804 | xfree(comment); | |
805 | ret = sign_and_send_pubkey(authctxt, k, agent_sign_cb); | |
806 | key_free(k); | |
188adeb2 | 807 | } |
fa08c86b | 808 | if (ret == 0) |
809 | debug2("userauth_pubkey_agent: no message sent"); | |
2e73a022 | 810 | return ret; |
a306f2dd | 811 | } |
812 | ||
188adeb2 | 813 | int |
814 | userauth_pubkey(Authctxt *authctxt) | |
a306f2dd | 815 | { |
188adeb2 | 816 | static int idx = 0; |
817 | int sent = 0; | |
818 | ||
fa08c86b | 819 | if (authctxt->agent != NULL) { |
820 | do { | |
821 | sent = userauth_pubkey_agent(authctxt); | |
822 | } while(!sent && authctxt->agent->howmany > 0); | |
823 | } | |
824 | while (!sent && idx < options.num_identity_files) { | |
825 | if (options.identity_files_type[idx] != KEY_RSA1) | |
826 | sent = userauth_pubkey_identity(authctxt, | |
827 | options.identity_files[idx]); | |
828 | idx++; | |
829 | } | |
188adeb2 | 830 | return sent; |
831 | } | |
a306f2dd | 832 | |
94ec8c6b | 833 | /* |
834 | * Send userauth request message specifying keyboard-interactive method. | |
835 | */ | |
836 | int | |
837 | userauth_kbdint(Authctxt *authctxt) | |
838 | { | |
839 | static int attempt = 0; | |
840 | ||
841 | if (attempt++ >= options.number_of_password_prompts) | |
842 | return 0; | |
843 | ||
844 | debug2("userauth_kbdint"); | |
845 | packet_start(SSH2_MSG_USERAUTH_REQUEST); | |
846 | packet_put_cstring(authctxt->server_user); | |
847 | packet_put_cstring(authctxt->service); | |
848 | packet_put_cstring(authctxt->method->name); | |
849 | packet_put_cstring(""); /* lang */ | |
850 | packet_put_cstring(options.kbd_interactive_devices ? | |
851 | options.kbd_interactive_devices : ""); | |
852 | packet_send(); | |
853 | packet_write_wait(); | |
854 | ||
855 | dispatch_set(SSH2_MSG_USERAUTH_INFO_REQUEST, &input_userauth_info_req); | |
856 | return 1; | |
857 | } | |
858 | ||
859 | /* | |
860 | * parse SSH2_MSG_USERAUTH_INFO_REQUEST, prompt user and send | |
861 | * SSH2_MSG_USERAUTH_INFO_RESPONSE | |
862 | */ | |
863 | void | |
864 | input_userauth_info_req(int type, int plen, void *ctxt) | |
865 | { | |
866 | Authctxt *authctxt = ctxt; | |
867 | char *name = NULL; | |
868 | char *inst = NULL; | |
869 | char *lang = NULL; | |
870 | char *prompt = NULL; | |
871 | char *response = NULL; | |
1e3b8b07 | 872 | u_int num_prompts, i; |
94ec8c6b | 873 | int echo = 0; |
874 | ||
875 | debug2("input_userauth_info_req"); | |
876 | ||
877 | if (authctxt == NULL) | |
878 | fatal("input_userauth_info_req: no authentication context"); | |
879 | ||
880 | name = packet_get_string(NULL); | |
881 | inst = packet_get_string(NULL); | |
882 | lang = packet_get_string(NULL); | |
883 | ||
884 | if (strlen(name) > 0) | |
885 | cli_mesg(name); | |
886 | xfree(name); | |
887 | ||
888 | if (strlen(inst) > 0) | |
889 | cli_mesg(inst); | |
890 | xfree(inst); | |
891 | xfree(lang); /* unused */ | |
892 | ||
893 | num_prompts = packet_get_int(); | |
894 | /* | |
895 | * Begin to build info response packet based on prompts requested. | |
896 | * We commit to providing the correct number of responses, so if | |
897 | * further on we run into a problem that prevents this, we have to | |
898 | * be sure and clean this up and send a correct error response. | |
899 | */ | |
900 | packet_start(SSH2_MSG_USERAUTH_INFO_RESPONSE); | |
901 | packet_put_int(num_prompts); | |
902 | ||
903 | for (i = 0; i < num_prompts; i++) { | |
904 | prompt = packet_get_string(NULL); | |
905 | echo = packet_get_char(); | |
906 | ||
907 | response = cli_prompt(prompt, echo); | |
908 | ||
909 | packet_put_cstring(response); | |
910 | memset(response, 0, strlen(response)); | |
911 | xfree(response); | |
912 | xfree(prompt); | |
913 | } | |
914 | packet_done(); /* done with parsing incoming message. */ | |
915 | ||
916 | packet_send(); | |
917 | packet_write_wait(); | |
918 | } | |
a306f2dd | 919 | |
188adeb2 | 920 | /* find auth method */ |
921 | ||
922 | #define DELIM "," | |
923 | ||
924 | static char *def_authlist = "publickey,password"; | |
925 | static char *authlist_current = NULL; /* clean copy used for comparison */ | |
926 | static char *authname_current = NULL; /* last used auth method */ | |
927 | static char *authlist_working = NULL; /* copy that gets modified by strtok_r() */ | |
928 | static char *authlist_state = NULL; /* state variable for strtok_r() */ | |
929 | ||
930 | /* | |
931 | * Before starting to use a new authentication method list sent by the | |
932 | * server, reset internal variables. This should also be called when | |
933 | * finished processing server list to free resources. | |
934 | */ | |
935 | void | |
1e3b8b07 | 936 | authmethod_clear(void) |
188adeb2 | 937 | { |
938 | if (authlist_current != NULL) { | |
939 | xfree(authlist_current); | |
940 | authlist_current = NULL; | |
a306f2dd | 941 | } |
188adeb2 | 942 | if (authlist_working != NULL) { |
943 | xfree(authlist_working); | |
944 | authlist_working = NULL; | |
a306f2dd | 945 | } |
188adeb2 | 946 | if (authname_current != NULL) { |
947 | xfree(authname_current); | |
948 | authlist_state = NULL; | |
949 | } | |
950 | if (authlist_state != NULL) | |
951 | authlist_state = NULL; | |
952 | return; | |
953 | } | |
a306f2dd | 954 | |
188adeb2 | 955 | /* |
956 | * given auth method name, if configurable options permit this method fill | |
957 | * in auth_ident field and return true, otherwise return false. | |
958 | */ | |
959 | int | |
960 | authmethod_is_enabled(Authmethod *method) | |
961 | { | |
962 | if (method == NULL) | |
963 | return 0; | |
964 | /* return false if options indicate this method is disabled */ | |
965 | if (method->enabled == NULL || *method->enabled == 0) | |
966 | return 0; | |
967 | /* return false if batch mode is enabled but method needs interactive mode */ | |
968 | if (method->batch_flag != NULL && *method->batch_flag != 0) | |
969 | return 0; | |
970 | return 1; | |
971 | } | |
a306f2dd | 972 | |
188adeb2 | 973 | Authmethod * |
974 | authmethod_lookup(const char *name) | |
975 | { | |
976 | Authmethod *method = NULL; | |
977 | if (name != NULL) | |
978 | for (method = authmethods; method->name != NULL; method++) | |
979 | if (strcmp(name, method->name) == 0) | |
980 | return method; | |
981 | debug2("Unrecognized authentication method name: %s", name ? name : "NULL"); | |
982 | return NULL; | |
983 | } | |
984 | ||
985 | /* | |
986 | * Given the authentication method list sent by the server, return the | |
987 | * next method we should try. If the server initially sends a nil list, | |
988 | * use a built-in default list. If the server sends a nil list after | |
989 | * previously sending a valid list, continue using the list originally | |
990 | * sent. | |
991 | */ | |
992 | ||
993 | Authmethod * | |
994 | authmethod_get(char *authlist) | |
995 | { | |
a22aff1f | 996 | char *name = NULL, *authname_old; |
188adeb2 | 997 | Authmethod *method = NULL; |
998 | ||
999 | /* Use a suitable default if we're passed a nil list. */ | |
1000 | if (authlist == NULL || strlen(authlist) == 0) | |
1001 | authlist = def_authlist; | |
1002 | ||
1003 | if (authlist_current == NULL || strcmp(authlist, authlist_current) != 0) { | |
1004 | /* start over if passed a different list */ | |
94ec8c6b | 1005 | debug3("start over, passed a different list"); |
188adeb2 | 1006 | authmethod_clear(); |
1007 | authlist_current = xstrdup(authlist); | |
1008 | authlist_working = xstrdup(authlist); | |
1009 | name = strtok_r(authlist_working, DELIM, &authlist_state); | |
1010 | } else { | |
1011 | /* | |
1012 | * try to use previously used authentication method | |
1013 | * or continue to use previously passed list | |
1014 | */ | |
1015 | name = (authname_current != NULL) ? | |
1016 | authname_current : strtok_r(NULL, DELIM, &authlist_state); | |
1017 | } | |
1018 | ||
1019 | while (name != NULL) { | |
94ec8c6b | 1020 | debug3("authmethod_lookup %s", name); |
188adeb2 | 1021 | method = authmethod_lookup(name); |
94ec8c6b | 1022 | if (method != NULL && authmethod_is_enabled(method)) { |
1023 | debug3("authmethod_is_enabled %s", name); | |
a306f2dd | 1024 | break; |
94ec8c6b | 1025 | } |
188adeb2 | 1026 | name = strtok_r(NULL, DELIM, &authlist_state); |
94ec8c6b | 1027 | method = NULL; |
188adeb2 | 1028 | } |
1029 | ||
a22aff1f | 1030 | authname_old = authname_current; |
94ec8c6b | 1031 | if (method != NULL) { |
188adeb2 | 1032 | debug("next auth method to try is %s", name); |
1033 | authname_current = xstrdup(name); | |
188adeb2 | 1034 | } else { |
1035 | debug("no more auth methods to try"); | |
1036 | authname_current = NULL; | |
a306f2dd | 1037 | } |
a22aff1f | 1038 | |
1039 | if (authname_old != NULL) | |
1040 | xfree(authname_old); | |
1041 | ||
1042 | return (method); | |
a306f2dd | 1043 | } |