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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" | |
762715ce | 26 | RCSID("$OpenBSD: sshconnect2.c,v 1.98 2002/03/19 10:49:35 markus Exp $"); |
a306f2dd | 27 | |
28 | #include "ssh.h" | |
42f11eb2 | 29 | #include "ssh2.h" |
a306f2dd | 30 | #include "xmalloc.h" |
a306f2dd | 31 | #include "buffer.h" |
32 | #include "packet.h" | |
a306f2dd | 33 | #include "compat.h" |
a306f2dd | 34 | #include "bufaux.h" |
42f11eb2 | 35 | #include "cipher.h" |
a306f2dd | 36 | #include "kex.h" |
37 | #include "myproposal.h" | |
a306f2dd | 38 | #include "sshconnect.h" |
39 | #include "authfile.h" | |
db1cd2f3 | 40 | #include "dh.h" |
2e73a022 | 41 | #include "authfd.h" |
42f11eb2 | 42 | #include "log.h" |
43 | #include "readconf.h" | |
44 | #include "readpass.h" | |
cab80f75 | 45 | #include "match.h" |
a5c9ffdb | 46 | #include "dispatch.h" |
8002af61 | 47 | #include "canohost.h" |
94ec8c6b | 48 | |
a306f2dd | 49 | /* import */ |
50 | extern char *client_version_string; | |
51 | extern char *server_version_string; | |
52 | extern Options options; | |
53 | ||
54 | /* | |
55 | * SSH2 key exchange | |
56 | */ | |
57 | ||
1e3b8b07 | 58 | u_char *session_id2 = NULL; |
a306f2dd | 59 | int session_id2_len = 0; |
60 | ||
a5c9ffdb | 61 | char *xxx_host; |
62 | struct sockaddr *xxx_hostaddr; | |
63 | ||
e092ce67 | 64 | Kex *xxx_kex = NULL; |
65 | ||
396c147e | 66 | static int |
f49bc4f7 | 67 | verify_host_key_callback(Key *hostkey) |
a5c9ffdb | 68 | { |
f49bc4f7 | 69 | if (verify_host_key(xxx_host, xxx_hostaddr, hostkey) == -1) |
01e9ef57 | 70 | fatal("Host key verification failed."); |
a5c9ffdb | 71 | return 0; |
72 | } | |
73 | ||
a306f2dd | 74 | void |
94ec8c6b | 75 | ssh_kex2(char *host, struct sockaddr *hostaddr) |
76 | { | |
94ec8c6b | 77 | Kex *kex; |
a5c9ffdb | 78 | |
79 | xxx_host = host; | |
80 | xxx_hostaddr = hostaddr; | |
94ec8c6b | 81 | |
c523303b | 82 | if (options.ciphers == (char *)-1) { |
83 | log("No valid ciphers for protocol version 2 given, using defaults."); | |
84 | options.ciphers = NULL; | |
94ec8c6b | 85 | } |
86 | if (options.ciphers != NULL) { | |
87 | myproposal[PROPOSAL_ENC_ALGS_CTOS] = | |
88 | myproposal[PROPOSAL_ENC_ALGS_STOC] = options.ciphers; | |
89 | } | |
1ad64a93 | 90 | myproposal[PROPOSAL_ENC_ALGS_CTOS] = |
91 | compat_cipher_proposal(myproposal[PROPOSAL_ENC_ALGS_CTOS]); | |
92 | myproposal[PROPOSAL_ENC_ALGS_STOC] = | |
93 | compat_cipher_proposal(myproposal[PROPOSAL_ENC_ALGS_STOC]); | |
94ec8c6b | 94 | if (options.compression) { |
b2552997 | 95 | myproposal[PROPOSAL_COMP_ALGS_CTOS] = |
94ec8c6b | 96 | myproposal[PROPOSAL_COMP_ALGS_STOC] = "zlib"; |
97 | } else { | |
b2552997 | 98 | myproposal[PROPOSAL_COMP_ALGS_CTOS] = |
94ec8c6b | 99 | myproposal[PROPOSAL_COMP_ALGS_STOC] = "none"; |
100 | } | |
b2552997 | 101 | if (options.macs != NULL) { |
102 | myproposal[PROPOSAL_MAC_ALGS_CTOS] = | |
103 | myproposal[PROPOSAL_MAC_ALGS_STOC] = options.macs; | |
104 | } | |
e961a8f9 | 105 | if (options.hostkeyalgorithms != NULL) |
184eed6a | 106 | myproposal[PROPOSAL_SERVER_HOST_KEY_ALGS] = |
e961a8f9 | 107 | options.hostkeyalgorithms; |
94ec8c6b | 108 | |
7a37c112 | 109 | /* start key exchange */ |
d8ee838b | 110 | kex = kex_setup(myproposal); |
a5c9ffdb | 111 | kex->client_version_string=client_version_string; |
112 | kex->server_version_string=server_version_string; | |
f49bc4f7 | 113 | kex->verify_host_key=&verify_host_key_callback; |
94ec8c6b | 114 | |
e092ce67 | 115 | xxx_kex = kex; |
116 | ||
c422989b | 117 | dispatch_run(DISPATCH_BLOCK, &kex->done, kex); |
94ec8c6b | 118 | |
d1ac6175 | 119 | session_id2 = kex->session_id; |
120 | session_id2_len = kex->session_id_len; | |
121 | ||
94ec8c6b | 122 | #ifdef DEBUG_KEXDH |
123 | /* send 1st encrypted/maced/compressed message */ | |
124 | packet_start(SSH2_MSG_IGNORE); | |
125 | packet_put_cstring("markus"); | |
126 | packet_send(); | |
127 | packet_write_wait(); | |
128 | #endif | |
a5c9ffdb | 129 | debug("done: ssh_kex2."); |
a306f2dd | 130 | } |
71276795 | 131 | |
a306f2dd | 132 | /* |
133 | * Authenticate user | |
134 | */ | |
188adeb2 | 135 | |
136 | typedef struct Authctxt Authctxt; | |
137 | typedef struct Authmethod Authmethod; | |
138 | ||
139 | typedef int sign_cb_fn( | |
140 | Authctxt *authctxt, Key *key, | |
c66f9d0e | 141 | u_char **sigp, u_int *lenp, u_char *data, u_int datalen); |
188adeb2 | 142 | |
143 | struct Authctxt { | |
144 | const char *server_user; | |
8002af61 | 145 | const char *local_user; |
188adeb2 | 146 | const char *host; |
147 | const char *service; | |
188adeb2 | 148 | Authmethod *method; |
94ec8c6b | 149 | int success; |
fee56204 | 150 | char *authlist; |
8002af61 | 151 | /* pubkey */ |
fee56204 | 152 | Key *last_key; |
153 | sign_cb_fn *last_key_sign; | |
154 | int last_key_hint; | |
8002af61 | 155 | AuthenticationConnection *agent; |
156 | /* hostbased */ | |
157 | Key **keys; | |
158 | int nkeys; | |
6b759005 | 159 | /* kbd-interactive */ |
160 | int info_req_seen; | |
188adeb2 | 161 | }; |
162 | struct Authmethod { | |
163 | char *name; /* string to compare against server's list */ | |
164 | int (*userauth)(Authctxt *authctxt); | |
165 | int *enabled; /* flag in option struct that enables method */ | |
166 | int *batch_flag; /* flag in option struct that disables method */ | |
167 | }; | |
168 | ||
7819b5c3 | 169 | void input_userauth_success(int, u_int32_t, void *); |
170 | void input_userauth_failure(int, u_int32_t, void *); | |
171 | void input_userauth_banner(int, u_int32_t, void *); | |
172 | void input_userauth_error(int, u_int32_t, void *); | |
173 | void input_userauth_info_req(int, u_int32_t, void *); | |
174 | void input_userauth_pk_ok(int, u_int32_t, void *); | |
94ec8c6b | 175 | |
d5bb9418 | 176 | int userauth_none(Authctxt *); |
177 | int userauth_pubkey(Authctxt *); | |
178 | int userauth_passwd(Authctxt *); | |
179 | int userauth_kbdint(Authctxt *); | |
180 | int userauth_hostbased(Authctxt *); | |
188adeb2 | 181 | |
d5bb9418 | 182 | void userauth(Authctxt *, char *); |
fee56204 | 183 | |
396c147e | 184 | static int sign_and_send_pubkey(Authctxt *, Key *, sign_cb_fn *); |
185 | static void clear_auth_state(Authctxt *); | |
fee56204 | 186 | |
396c147e | 187 | static Authmethod *authmethod_get(char *authlist); |
188 | static Authmethod *authmethod_lookup(const char *name); | |
189 | static char *authmethods_get(void); | |
188adeb2 | 190 | |
191 | Authmethod authmethods[] = { | |
3398dda9 | 192 | {"hostbased", |
193 | userauth_hostbased, | |
194 | &options.hostbased_authentication, | |
195 | NULL}, | |
9f37c0af | 196 | {"publickey", |
197 | userauth_pubkey, | |
198 | &options.pubkey_authentication, | |
199 | NULL}, | |
94ec8c6b | 200 | {"keyboard-interactive", |
201 | userauth_kbdint, | |
202 | &options.kbd_interactive_authentication, | |
203 | &options.batch_mode}, | |
9f37c0af | 204 | {"password", |
205 | userauth_passwd, | |
206 | &options.password_authentication, | |
207 | &options.batch_mode}, | |
94ec8c6b | 208 | {"none", |
209 | userauth_none, | |
210 | NULL, | |
211 | NULL}, | |
188adeb2 | 212 | {NULL, NULL, NULL, NULL} |
213 | }; | |
214 | ||
215 | void | |
8002af61 | 216 | ssh_userauth2(const char *local_user, const char *server_user, char *host, |
217 | Key **keys, int nkeys) | |
188adeb2 | 218 | { |
219 | Authctxt authctxt; | |
220 | int type; | |
188adeb2 | 221 | |
5ba55ada | 222 | if (options.challenge_response_authentication) |
d464095c | 223 | options.kbd_interactive_authentication = 1; |
224 | ||
188adeb2 | 225 | debug("send SSH2_MSG_SERVICE_REQUEST"); |
226 | packet_start(SSH2_MSG_SERVICE_REQUEST); | |
227 | packet_put_cstring("ssh-userauth"); | |
228 | packet_send(); | |
229 | packet_write_wait(); | |
54a5250f | 230 | type = packet_read(); |
188adeb2 | 231 | if (type != SSH2_MSG_SERVICE_ACCEPT) { |
232 | fatal("denied SSH2_MSG_SERVICE_ACCEPT: %d", type); | |
233 | } | |
234 | if (packet_remaining() > 0) { | |
54a5250f | 235 | char *reply = packet_get_string(NULL); |
188adeb2 | 236 | debug("service_accept: %s", reply); |
237 | xfree(reply); | |
188adeb2 | 238 | } else { |
239 | debug("buggy server: service_accept w/o service"); | |
240 | } | |
95500969 | 241 | packet_check_eom(); |
188adeb2 | 242 | debug("got SSH2_MSG_SERVICE_ACCEPT"); |
243 | ||
cab80f75 | 244 | if (options.preferred_authentications == NULL) |
245 | options.preferred_authentications = authmethods_get(); | |
246 | ||
188adeb2 | 247 | /* setup authentication context */ |
6b759005 | 248 | memset(&authctxt, 0, sizeof(authctxt)); |
188adeb2 | 249 | authctxt.agent = ssh_get_authentication_connection(); |
250 | authctxt.server_user = server_user; | |
8002af61 | 251 | authctxt.local_user = local_user; |
188adeb2 | 252 | authctxt.host = host; |
253 | authctxt.service = "ssh-connection"; /* service name */ | |
254 | authctxt.success = 0; | |
94ec8c6b | 255 | authctxt.method = authmethod_lookup("none"); |
fee56204 | 256 | authctxt.authlist = NULL; |
8002af61 | 257 | authctxt.keys = keys; |
258 | authctxt.nkeys = nkeys; | |
6b759005 | 259 | authctxt.info_req_seen = 0; |
94ec8c6b | 260 | if (authctxt.method == NULL) |
261 | fatal("ssh_userauth2: internal error: cannot send userauth none request"); | |
188adeb2 | 262 | |
263 | /* initial userauth request */ | |
94ec8c6b | 264 | userauth_none(&authctxt); |
188adeb2 | 265 | |
7a37c112 | 266 | dispatch_init(&input_userauth_error); |
188adeb2 | 267 | dispatch_set(SSH2_MSG_USERAUTH_SUCCESS, &input_userauth_success); |
268 | dispatch_set(SSH2_MSG_USERAUTH_FAILURE, &input_userauth_failure); | |
9616313f | 269 | dispatch_set(SSH2_MSG_USERAUTH_BANNER, &input_userauth_banner); |
188adeb2 | 270 | dispatch_run(DISPATCH_BLOCK, &authctxt.success, &authctxt); /* loop until success */ |
271 | ||
272 | if (authctxt.agent != NULL) | |
273 | ssh_close_authentication_connection(authctxt.agent); | |
274 | ||
8abcdba4 | 275 | debug("ssh-userauth2 successful: method %s", authctxt.method->name); |
188adeb2 | 276 | } |
277 | void | |
fee56204 | 278 | userauth(Authctxt *authctxt, char *authlist) |
279 | { | |
280 | if (authlist == NULL) { | |
281 | authlist = authctxt->authlist; | |
282 | } else { | |
283 | if (authctxt->authlist) | |
284 | xfree(authctxt->authlist); | |
285 | authctxt->authlist = authlist; | |
286 | } | |
287 | for (;;) { | |
288 | Authmethod *method = authmethod_get(authlist); | |
289 | if (method == NULL) | |
290 | fatal("Permission denied (%s).", authlist); | |
291 | authctxt->method = method; | |
292 | if (method->userauth(authctxt) != 0) { | |
293 | debug2("we sent a %s packet, wait for reply", method->name); | |
294 | break; | |
295 | } else { | |
296 | debug2("we did not send a packet, disable method"); | |
297 | method->enabled = NULL; | |
298 | } | |
299 | } | |
300 | } | |
301 | void | |
7819b5c3 | 302 | input_userauth_error(int type, u_int32_t seq, void *ctxt) |
188adeb2 | 303 | { |
9616313f | 304 | fatal("input_userauth_error: bad message during authentication: " |
305 | "type %d", type); | |
306 | } | |
307 | void | |
7819b5c3 | 308 | input_userauth_banner(int type, u_int32_t seq, void *ctxt) |
9616313f | 309 | { |
310 | char *msg, *lang; | |
311 | debug3("input_userauth_banner"); | |
312 | msg = packet_get_string(NULL); | |
313 | lang = packet_get_string(NULL); | |
314 | fprintf(stderr, "%s", msg); | |
315 | xfree(msg); | |
316 | xfree(lang); | |
188adeb2 | 317 | } |
318 | void | |
7819b5c3 | 319 | input_userauth_success(int type, u_int32_t seq, void *ctxt) |
188adeb2 | 320 | { |
321 | Authctxt *authctxt = ctxt; | |
322 | if (authctxt == NULL) | |
323 | fatal("input_userauth_success: no authentication context"); | |
fee56204 | 324 | if (authctxt->authlist) |
325 | xfree(authctxt->authlist); | |
326 | clear_auth_state(authctxt); | |
188adeb2 | 327 | authctxt->success = 1; /* break out */ |
328 | } | |
329 | void | |
7819b5c3 | 330 | input_userauth_failure(int type, u_int32_t seq, void *ctxt) |
188adeb2 | 331 | { |
188adeb2 | 332 | Authctxt *authctxt = ctxt; |
333 | char *authlist = NULL; | |
334 | int partial; | |
188adeb2 | 335 | |
336 | if (authctxt == NULL) | |
337 | fatal("input_userauth_failure: no authentication context"); | |
338 | ||
94ec8c6b | 339 | authlist = packet_get_string(NULL); |
188adeb2 | 340 | partial = packet_get_char(); |
95500969 | 341 | packet_check_eom(); |
188adeb2 | 342 | |
343 | if (partial != 0) | |
f72e01a5 | 344 | log("Authenticated with partial success."); |
188adeb2 | 345 | debug("authentications that can continue: %s", authlist); |
346 | ||
fee56204 | 347 | clear_auth_state(authctxt); |
348 | userauth(authctxt, authlist); | |
349 | } | |
350 | void | |
7819b5c3 | 351 | input_userauth_pk_ok(int type, u_int32_t seq, void *ctxt) |
fee56204 | 352 | { |
353 | Authctxt *authctxt = ctxt; | |
354 | Key *key = NULL; | |
355 | Buffer b; | |
c66f9d0e | 356 | int pktype, sent = 0; |
357 | u_int alen, blen; | |
358 | char *pkalg, *fp; | |
359 | u_char *pkblob; | |
fee56204 | 360 | |
361 | if (authctxt == NULL) | |
362 | fatal("input_userauth_pk_ok: no authentication context"); | |
363 | if (datafellows & SSH_BUG_PKOK) { | |
364 | /* this is similar to SSH_BUG_PKAUTH */ | |
365 | debug2("input_userauth_pk_ok: SSH_BUG_PKOK"); | |
366 | pkblob = packet_get_string(&blen); | |
367 | buffer_init(&b); | |
368 | buffer_append(&b, pkblob, blen); | |
369 | pkalg = buffer_get_string(&b, &alen); | |
370 | buffer_free(&b); | |
371 | } else { | |
372 | pkalg = packet_get_string(&alen); | |
373 | pkblob = packet_get_string(&blen); | |
374 | } | |
95500969 | 375 | packet_check_eom(); |
fee56204 | 376 | |
377 | debug("input_userauth_pk_ok: pkalg %s blen %d lastkey %p hint %d", | |
378 | pkalg, blen, authctxt->last_key, authctxt->last_key_hint); | |
379 | ||
380 | do { | |
381 | if (authctxt->last_key == NULL || | |
382 | authctxt->last_key_sign == NULL) { | |
383 | debug("no last key or no sign cb"); | |
188adeb2 | 384 | break; |
188adeb2 | 385 | } |
0dbdc37c | 386 | if ((pktype = key_type_from_name(pkalg)) == KEY_UNSPEC) { |
fee56204 | 387 | debug("unknown pkalg %s", pkalg); |
388 | break; | |
389 | } | |
390 | if ((key = key_from_blob(pkblob, blen)) == NULL) { | |
391 | debug("no key from blob. pkalg %s", pkalg); | |
392 | break; | |
393 | } | |
762715ce | 394 | if (key->type != pktype) { |
0dbdc37c | 395 | error("input_userauth_pk_ok: type mismatch " |
396 | "for decoded key (received %d, expected %d)", | |
397 | key->type, pktype); | |
398 | break; | |
399 | } | |
22138a36 | 400 | fp = key_fingerprint(key, SSH_FP_MD5, SSH_FP_HEX); |
401 | debug2("input_userauth_pk_ok: fp %s", fp); | |
402 | xfree(fp); | |
fee56204 | 403 | if (!key_equal(key, authctxt->last_key)) { |
404 | debug("key != last_key"); | |
405 | break; | |
406 | } | |
407 | sent = sign_and_send_pubkey(authctxt, key, | |
408 | authctxt->last_key_sign); | |
6aacefa7 | 409 | } while (0); |
fee56204 | 410 | |
411 | if (key != NULL) | |
412 | key_free(key); | |
413 | xfree(pkalg); | |
414 | xfree(pkblob); | |
415 | ||
416 | /* unregister */ | |
417 | clear_auth_state(authctxt); | |
418 | dispatch_set(SSH2_MSG_USERAUTH_PK_OK, NULL); | |
419 | ||
420 | /* try another method if we did not send a packet*/ | |
421 | if (sent == 0) | |
422 | userauth(authctxt, NULL); | |
423 | ||
188adeb2 | 424 | } |
425 | ||
94ec8c6b | 426 | int |
427 | userauth_none(Authctxt *authctxt) | |
428 | { | |
429 | /* initial userauth request */ | |
430 | packet_start(SSH2_MSG_USERAUTH_REQUEST); | |
431 | packet_put_cstring(authctxt->server_user); | |
432 | packet_put_cstring(authctxt->service); | |
433 | packet_put_cstring(authctxt->method->name); | |
434 | packet_send(); | |
94ec8c6b | 435 | return 1; |
436 | } | |
437 | ||
a306f2dd | 438 | int |
188adeb2 | 439 | userauth_passwd(Authctxt *authctxt) |
a306f2dd | 440 | { |
1d1ffb87 | 441 | static int attempt = 0; |
a306f2dd | 442 | char prompt[80]; |
443 | char *password; | |
444 | ||
fa649821 | 445 | if (attempt++ >= options.number_of_password_prompts) |
1d1ffb87 | 446 | return 0; |
447 | ||
6aacefa7 | 448 | if (attempt != 1) |
fa649821 | 449 | error("Permission denied, please try again."); |
450 | ||
f72e01a5 | 451 | snprintf(prompt, sizeof(prompt), "%.30s@%.128s's password: ", |
188adeb2 | 452 | authctxt->server_user, authctxt->host); |
a306f2dd | 453 | password = read_passphrase(prompt, 0); |
454 | packet_start(SSH2_MSG_USERAUTH_REQUEST); | |
188adeb2 | 455 | packet_put_cstring(authctxt->server_user); |
456 | packet_put_cstring(authctxt->service); | |
94ec8c6b | 457 | packet_put_cstring(authctxt->method->name); |
a306f2dd | 458 | packet_put_char(0); |
a6215e53 | 459 | packet_put_cstring(password); |
a306f2dd | 460 | memset(password, 0, strlen(password)); |
461 | xfree(password); | |
b4b701be | 462 | packet_add_padding(64); |
a306f2dd | 463 | packet_send(); |
a306f2dd | 464 | return 1; |
465 | } | |
466 | ||
ffb215be | 467 | static void |
fee56204 | 468 | clear_auth_state(Authctxt *authctxt) |
469 | { | |
470 | /* XXX clear authentication state */ | |
471 | if (authctxt->last_key != NULL && authctxt->last_key_hint == -1) { | |
472 | debug3("clear_auth_state: key_free %p", authctxt->last_key); | |
473 | key_free(authctxt->last_key); | |
474 | } | |
475 | authctxt->last_key = NULL; | |
476 | authctxt->last_key_hint = -2; | |
477 | authctxt->last_key_sign = NULL; | |
478 | } | |
479 | ||
396c147e | 480 | static int |
188adeb2 | 481 | sign_and_send_pubkey(Authctxt *authctxt, Key *k, sign_cb_fn *sign_callback) |
a306f2dd | 482 | { |
483 | Buffer b; | |
1e3b8b07 | 484 | u_char *blob, *signature; |
c66f9d0e | 485 | u_int bloblen, slen; |
74fc9186 | 486 | int skip = 0; |
2e73a022 | 487 | int ret = -1; |
94ec8c6b | 488 | int have_sig = 1; |
a306f2dd | 489 | |
cbc5abf9 | 490 | debug3("sign_and_send_pubkey"); |
fee56204 | 491 | |
fa08c86b | 492 | if (key_to_blob(k, &blob, &bloblen) == 0) { |
493 | /* we cannot handle this key */ | |
cbc5abf9 | 494 | debug3("sign_and_send_pubkey: cannot handle key"); |
fa08c86b | 495 | return 0; |
496 | } | |
a306f2dd | 497 | /* data to be signed */ |
498 | buffer_init(&b); | |
33de75a3 | 499 | if (datafellows & SSH_OLD_SESSIONID) { |
74fc9186 | 500 | buffer_append(&b, session_id2, session_id2_len); |
2b87da3b | 501 | skip = session_id2_len; |
33de75a3 | 502 | } else { |
503 | buffer_put_string(&b, session_id2, session_id2_len); | |
504 | skip = buffer_len(&b); | |
74fc9186 | 505 | } |
a306f2dd | 506 | buffer_put_char(&b, SSH2_MSG_USERAUTH_REQUEST); |
188adeb2 | 507 | buffer_put_cstring(&b, authctxt->server_user); |
d0c832f3 | 508 | buffer_put_cstring(&b, |
cbc5abf9 | 509 | datafellows & SSH_BUG_PKSERVICE ? |
d0c832f3 | 510 | "ssh-userauth" : |
188adeb2 | 511 | authctxt->service); |
cbc5abf9 | 512 | if (datafellows & SSH_BUG_PKAUTH) { |
513 | buffer_put_char(&b, have_sig); | |
514 | } else { | |
515 | buffer_put_cstring(&b, authctxt->method->name); | |
516 | buffer_put_char(&b, have_sig); | |
2b87da3b | 517 | buffer_put_cstring(&b, key_ssh_name(k)); |
cbc5abf9 | 518 | } |
a306f2dd | 519 | buffer_put_string(&b, blob, bloblen); |
a306f2dd | 520 | |
521 | /* generate signature */ | |
fee56204 | 522 | ret = (*sign_callback)(authctxt, k, &signature, &slen, |
523 | buffer_ptr(&b), buffer_len(&b)); | |
2e73a022 | 524 | if (ret == -1) { |
525 | xfree(blob); | |
526 | buffer_free(&b); | |
527 | return 0; | |
528 | } | |
fa08c86b | 529 | #ifdef DEBUG_PK |
a306f2dd | 530 | buffer_dump(&b); |
531 | #endif | |
cbc5abf9 | 532 | if (datafellows & SSH_BUG_PKSERVICE) { |
d0c832f3 | 533 | buffer_clear(&b); |
534 | buffer_append(&b, session_id2, session_id2_len); | |
fee56204 | 535 | skip = session_id2_len; |
d0c832f3 | 536 | buffer_put_char(&b, SSH2_MSG_USERAUTH_REQUEST); |
188adeb2 | 537 | buffer_put_cstring(&b, authctxt->server_user); |
538 | buffer_put_cstring(&b, authctxt->service); | |
94ec8c6b | 539 | buffer_put_cstring(&b, authctxt->method->name); |
540 | buffer_put_char(&b, have_sig); | |
cbc5abf9 | 541 | if (!(datafellows & SSH_BUG_PKAUTH)) |
2b87da3b | 542 | buffer_put_cstring(&b, key_ssh_name(k)); |
d0c832f3 | 543 | buffer_put_string(&b, blob, bloblen); |
544 | } | |
545 | xfree(blob); | |
fee56204 | 546 | |
a306f2dd | 547 | /* append signature */ |
548 | buffer_put_string(&b, signature, slen); | |
549 | xfree(signature); | |
550 | ||
551 | /* skip session id and packet type */ | |
74fc9186 | 552 | if (buffer_len(&b) < skip + 1) |
188adeb2 | 553 | fatal("userauth_pubkey: internal error"); |
74fc9186 | 554 | buffer_consume(&b, skip + 1); |
a306f2dd | 555 | |
556 | /* put remaining data from buffer into packet */ | |
557 | packet_start(SSH2_MSG_USERAUTH_REQUEST); | |
558 | packet_put_raw(buffer_ptr(&b), buffer_len(&b)); | |
559 | buffer_free(&b); | |
a306f2dd | 560 | packet_send(); |
2e73a022 | 561 | |
562 | return 1; | |
4c8722d9 | 563 | } |
564 | ||
396c147e | 565 | static int |
fee56204 | 566 | send_pubkey_test(Authctxt *authctxt, Key *k, sign_cb_fn *sign_callback, |
567 | int hint) | |
4c8722d9 | 568 | { |
fee56204 | 569 | u_char *blob; |
21b30f38 | 570 | u_int bloblen, have_sig = 0; |
4c8722d9 | 571 | |
fee56204 | 572 | debug3("send_pubkey_test"); |
573 | ||
574 | if (key_to_blob(k, &blob, &bloblen) == 0) { | |
575 | /* we cannot handle this key */ | |
576 | debug3("send_pubkey_test: cannot handle key"); | |
4c8722d9 | 577 | return 0; |
578 | } | |
fee56204 | 579 | /* register callback for USERAUTH_PK_OK message */ |
580 | authctxt->last_key_sign = sign_callback; | |
581 | authctxt->last_key_hint = hint; | |
582 | authctxt->last_key = k; | |
583 | dispatch_set(SSH2_MSG_USERAUTH_PK_OK, &input_userauth_pk_ok); | |
4c8722d9 | 584 | |
fee56204 | 585 | packet_start(SSH2_MSG_USERAUTH_REQUEST); |
586 | packet_put_cstring(authctxt->server_user); | |
587 | packet_put_cstring(authctxt->service); | |
588 | packet_put_cstring(authctxt->method->name); | |
589 | packet_put_char(have_sig); | |
590 | if (!(datafellows & SSH_BUG_PKAUTH)) | |
591 | packet_put_cstring(key_ssh_name(k)); | |
592 | packet_put_string(blob, bloblen); | |
593 | xfree(blob); | |
594 | packet_send(); | |
595 | return 1; | |
596 | } | |
597 | ||
396c147e | 598 | static Key * |
fee56204 | 599 | load_identity_file(char *filename) |
600 | { | |
601 | Key *private; | |
602 | char prompt[300], *passphrase; | |
aeaa3d9e | 603 | int quit, i; |
d156519a | 604 | struct stat st; |
fee56204 | 605 | |
d156519a | 606 | if (stat(filename, &st) < 0) { |
607 | debug3("no such identity: %s", filename); | |
608 | return NULL; | |
609 | } | |
aeaa3d9e | 610 | private = key_load_private_type(KEY_UNSPEC, filename, "", NULL); |
611 | if (private == NULL) { | |
612 | if (options.batch_mode) | |
fee56204 | 613 | return NULL; |
4c8722d9 | 614 | snprintf(prompt, sizeof prompt, |
184eed6a | 615 | "Enter passphrase for key '%.100s': ", filename); |
188adeb2 | 616 | for (i = 0; i < options.number_of_password_prompts; i++) { |
617 | passphrase = read_passphrase(prompt, 0); | |
618 | if (strcmp(passphrase, "") != 0) { | |
aeaa3d9e | 619 | private = key_load_private_type(KEY_UNSPEC, filename, |
620 | passphrase, NULL); | |
fee56204 | 621 | quit = 0; |
188adeb2 | 622 | } else { |
623 | debug2("no passphrase given, try next key"); | |
fee56204 | 624 | quit = 1; |
188adeb2 | 625 | } |
626 | memset(passphrase, 0, strlen(passphrase)); | |
627 | xfree(passphrase); | |
aeaa3d9e | 628 | if (private != NULL || quit) |
188adeb2 | 629 | break; |
630 | debug2("bad passphrase given, try again..."); | |
631 | } | |
4c8722d9 | 632 | } |
fee56204 | 633 | return private; |
634 | } | |
635 | ||
396c147e | 636 | static int |
c66f9d0e | 637 | identity_sign_cb(Authctxt *authctxt, Key *key, u_char **sigp, u_int *lenp, |
638 | u_char *data, u_int datalen) | |
fee56204 | 639 | { |
640 | Key *private; | |
641 | int idx, ret; | |
642 | ||
643 | idx = authctxt->last_key_hint; | |
644 | if (idx < 0) | |
645 | return -1; | |
383546c4 | 646 | |
647 | /* private key is stored in external hardware */ | |
184eed6a | 648 | if (options.identity_keys[idx]->flags & KEY_FLAG_EXT) |
383546c4 | 649 | return key_sign(options.identity_keys[idx], sigp, lenp, data, datalen); |
650 | ||
fee56204 | 651 | private = load_identity_file(options.identity_files[idx]); |
652 | if (private == NULL) | |
653 | return -1; | |
654 | ret = key_sign(private, sigp, lenp, data, datalen); | |
655 | key_free(private); | |
2e73a022 | 656 | return ret; |
657 | } | |
658 | ||
396c147e | 659 | static int |
c66f9d0e | 660 | agent_sign_cb(Authctxt *authctxt, Key *key, u_char **sigp, u_int *lenp, |
661 | u_char *data, u_int datalen) | |
2e73a022 | 662 | { |
188adeb2 | 663 | return ssh_agent_sign(authctxt->agent, key, sigp, lenp, data, datalen); |
2e73a022 | 664 | } |
665 | ||
396c147e | 666 | static int |
c66f9d0e | 667 | key_sign_cb(Authctxt *authctxt, Key *key, u_char **sigp, u_int *lenp, |
668 | u_char *data, u_int datalen) | |
fee56204 | 669 | { |
cd332296 | 670 | return key_sign(key, sigp, lenp, data, datalen); |
fee56204 | 671 | } |
672 | ||
396c147e | 673 | static int |
188adeb2 | 674 | userauth_pubkey_agent(Authctxt *authctxt) |
2e73a022 | 675 | { |
676 | static int called = 0; | |
fa08c86b | 677 | int ret = 0; |
2e73a022 | 678 | char *comment; |
679 | Key *k; | |
2e73a022 | 680 | |
681 | if (called == 0) { | |
fa08c86b | 682 | if (ssh_get_num_identities(authctxt->agent, 2) == 0) |
683 | debug2("userauth_pubkey_agent: no keys at all"); | |
188adeb2 | 684 | called = 1; |
2e73a022 | 685 | } |
fa08c86b | 686 | k = ssh_get_next_identity(authctxt->agent, &comment, 2); |
188adeb2 | 687 | if (k == NULL) { |
fa08c86b | 688 | debug2("userauth_pubkey_agent: no more keys"); |
689 | } else { | |
fee56204 | 690 | debug("userauth_pubkey_agent: testing agent key %s", comment); |
fa08c86b | 691 | xfree(comment); |
fee56204 | 692 | ret = send_pubkey_test(authctxt, k, agent_sign_cb, -1); |
693 | if (ret == 0) | |
694 | key_free(k); | |
188adeb2 | 695 | } |
fa08c86b | 696 | if (ret == 0) |
697 | debug2("userauth_pubkey_agent: no message sent"); | |
2e73a022 | 698 | return ret; |
a306f2dd | 699 | } |
700 | ||
188adeb2 | 701 | int |
702 | userauth_pubkey(Authctxt *authctxt) | |
a306f2dd | 703 | { |
188adeb2 | 704 | static int idx = 0; |
705 | int sent = 0; | |
fee56204 | 706 | Key *key; |
707 | char *filename; | |
188adeb2 | 708 | |
fa08c86b | 709 | if (authctxt->agent != NULL) { |
710 | do { | |
711 | sent = userauth_pubkey_agent(authctxt); | |
6aacefa7 | 712 | } while (!sent && authctxt->agent->howmany > 0); |
fa08c86b | 713 | } |
714 | while (!sent && idx < options.num_identity_files) { | |
fee56204 | 715 | key = options.identity_keys[idx]; |
716 | filename = options.identity_files[idx]; | |
717 | if (key == NULL) { | |
718 | debug("try privkey: %s", filename); | |
719 | key = load_identity_file(filename); | |
720 | if (key != NULL) { | |
721 | sent = sign_and_send_pubkey(authctxt, key, | |
722 | key_sign_cb); | |
723 | key_free(key); | |
724 | } | |
725 | } else if (key->type != KEY_RSA1) { | |
726 | debug("try pubkey: %s", filename); | |
727 | sent = send_pubkey_test(authctxt, key, | |
728 | identity_sign_cb, idx); | |
729 | } | |
fa08c86b | 730 | idx++; |
731 | } | |
188adeb2 | 732 | return sent; |
733 | } | |
a306f2dd | 734 | |
94ec8c6b | 735 | /* |
736 | * Send userauth request message specifying keyboard-interactive method. | |
737 | */ | |
738 | int | |
739 | userauth_kbdint(Authctxt *authctxt) | |
740 | { | |
741 | static int attempt = 0; | |
742 | ||
743 | if (attempt++ >= options.number_of_password_prompts) | |
744 | return 0; | |
6b759005 | 745 | /* disable if no SSH2_MSG_USERAUTH_INFO_REQUEST has been seen */ |
746 | if (attempt > 1 && !authctxt->info_req_seen) { | |
747 | debug3("userauth_kbdint: disable: no info_req_seen"); | |
748 | dispatch_set(SSH2_MSG_USERAUTH_INFO_REQUEST, NULL); | |
749 | return 0; | |
750 | } | |
94ec8c6b | 751 | |
752 | debug2("userauth_kbdint"); | |
753 | packet_start(SSH2_MSG_USERAUTH_REQUEST); | |
754 | packet_put_cstring(authctxt->server_user); | |
755 | packet_put_cstring(authctxt->service); | |
756 | packet_put_cstring(authctxt->method->name); | |
757 | packet_put_cstring(""); /* lang */ | |
758 | packet_put_cstring(options.kbd_interactive_devices ? | |
759 | options.kbd_interactive_devices : ""); | |
760 | packet_send(); | |
94ec8c6b | 761 | |
762 | dispatch_set(SSH2_MSG_USERAUTH_INFO_REQUEST, &input_userauth_info_req); | |
763 | return 1; | |
764 | } | |
765 | ||
766 | /* | |
f72e01a5 | 767 | * parse INFO_REQUEST, prompt user and send INFO_RESPONSE |
94ec8c6b | 768 | */ |
769 | void | |
7819b5c3 | 770 | input_userauth_info_req(int type, u_int32_t seq, void *ctxt) |
94ec8c6b | 771 | { |
772 | Authctxt *authctxt = ctxt; | |
f72e01a5 | 773 | char *name, *inst, *lang, *prompt, *response; |
1e3b8b07 | 774 | u_int num_prompts, i; |
94ec8c6b | 775 | int echo = 0; |
776 | ||
777 | debug2("input_userauth_info_req"); | |
778 | ||
779 | if (authctxt == NULL) | |
780 | fatal("input_userauth_info_req: no authentication context"); | |
781 | ||
6b759005 | 782 | authctxt->info_req_seen = 1; |
783 | ||
94ec8c6b | 784 | name = packet_get_string(NULL); |
785 | inst = packet_get_string(NULL); | |
786 | lang = packet_get_string(NULL); | |
94ec8c6b | 787 | if (strlen(name) > 0) |
80097c54 | 788 | log("%s", name); |
94ec8c6b | 789 | if (strlen(inst) > 0) |
80097c54 | 790 | log("%s", inst); |
f72e01a5 | 791 | xfree(name); |
94ec8c6b | 792 | xfree(inst); |
f72e01a5 | 793 | xfree(lang); |
94ec8c6b | 794 | |
795 | num_prompts = packet_get_int(); | |
796 | /* | |
797 | * Begin to build info response packet based on prompts requested. | |
798 | * We commit to providing the correct number of responses, so if | |
799 | * further on we run into a problem that prevents this, we have to | |
800 | * be sure and clean this up and send a correct error response. | |
801 | */ | |
802 | packet_start(SSH2_MSG_USERAUTH_INFO_RESPONSE); | |
803 | packet_put_int(num_prompts); | |
804 | ||
5ba55ada | 805 | debug2("input_userauth_info_req: num_prompts %d", num_prompts); |
94ec8c6b | 806 | for (i = 0; i < num_prompts; i++) { |
807 | prompt = packet_get_string(NULL); | |
808 | echo = packet_get_char(); | |
809 | ||
1843a425 | 810 | response = read_passphrase(prompt, echo ? RP_ECHO : 0); |
94ec8c6b | 811 | |
a6215e53 | 812 | packet_put_cstring(response); |
94ec8c6b | 813 | memset(response, 0, strlen(response)); |
814 | xfree(response); | |
815 | xfree(prompt); | |
816 | } | |
95500969 | 817 | packet_check_eom(); /* done with parsing incoming message. */ |
94ec8c6b | 818 | |
b4b701be | 819 | packet_add_padding(64); |
94ec8c6b | 820 | packet_send(); |
94ec8c6b | 821 | } |
a306f2dd | 822 | |
8002af61 | 823 | /* |
824 | * this will be move to an external program (ssh-keysign) ASAP. ssh-keysign | |
825 | * will be setuid-root and the sbit can be removed from /usr/bin/ssh. | |
826 | */ | |
827 | int | |
828 | userauth_hostbased(Authctxt *authctxt) | |
829 | { | |
830 | Key *private = NULL; | |
831 | Buffer b; | |
832 | u_char *signature, *blob; | |
833 | char *chost, *pkalg, *p; | |
8dddf799 | 834 | const char *service; |
8002af61 | 835 | u_int blen, slen; |
f98c3421 | 836 | int ok, i, len, found = 0; |
8002af61 | 837 | |
8002af61 | 838 | /* check for a useful key */ |
839 | for (i = 0; i < authctxt->nkeys; i++) { | |
840 | private = authctxt->keys[i]; | |
841 | if (private && private->type != KEY_RSA1) { | |
842 | found = 1; | |
843 | /* we take and free the key */ | |
844 | authctxt->keys[i] = NULL; | |
845 | break; | |
846 | } | |
847 | } | |
848 | if (!found) { | |
e8d59b4d | 849 | debug("userauth_hostbased: no more client hostkeys"); |
8002af61 | 850 | return 0; |
851 | } | |
852 | if (key_to_blob(private, &blob, &blen) == 0) { | |
853 | key_free(private); | |
8002af61 | 854 | return 0; |
855 | } | |
e8d59b4d | 856 | /* figure out a name for the client host */ |
857 | p = get_local_name(packet_get_connection_in()); | |
858 | if (p == NULL) { | |
859 | error("userauth_hostbased: cannot get local ipaddr/name"); | |
860 | key_free(private); | |
861 | return 0; | |
862 | } | |
863 | len = strlen(p) + 2; | |
864 | chost = xmalloc(len); | |
865 | strlcpy(chost, p, len); | |
866 | strlcat(chost, ".", len); | |
867 | debug2("userauth_hostbased: chost %s", chost); | |
868 | ||
8dddf799 | 869 | service = datafellows & SSH_BUG_HBSERVICE ? "ssh-userauth" : |
870 | authctxt->service; | |
8002af61 | 871 | pkalg = xstrdup(key_ssh_name(private)); |
872 | buffer_init(&b); | |
8002af61 | 873 | /* construct data */ |
8dddf799 | 874 | buffer_put_string(&b, session_id2, session_id2_len); |
8002af61 | 875 | buffer_put_char(&b, SSH2_MSG_USERAUTH_REQUEST); |
876 | buffer_put_cstring(&b, authctxt->server_user); | |
8dddf799 | 877 | buffer_put_cstring(&b, service); |
8002af61 | 878 | buffer_put_cstring(&b, authctxt->method->name); |
879 | buffer_put_cstring(&b, pkalg); | |
880 | buffer_put_string(&b, blob, blen); | |
881 | buffer_put_cstring(&b, chost); | |
882 | buffer_put_cstring(&b, authctxt->local_user); | |
883 | #ifdef DEBUG_PK | |
884 | buffer_dump(&b); | |
885 | #endif | |
8002af61 | 886 | ok = key_sign(private, &signature, &slen, buffer_ptr(&b), buffer_len(&b)); |
887 | key_free(private); | |
888 | buffer_free(&b); | |
889 | if (ok != 0) { | |
890 | error("key_sign failed"); | |
891 | xfree(chost); | |
892 | xfree(pkalg); | |
893 | return 0; | |
894 | } | |
895 | packet_start(SSH2_MSG_USERAUTH_REQUEST); | |
896 | packet_put_cstring(authctxt->server_user); | |
897 | packet_put_cstring(authctxt->service); | |
898 | packet_put_cstring(authctxt->method->name); | |
899 | packet_put_cstring(pkalg); | |
900 | packet_put_string(blob, blen); | |
901 | packet_put_cstring(chost); | |
902 | packet_put_cstring(authctxt->local_user); | |
903 | packet_put_string(signature, slen); | |
904 | memset(signature, 's', slen); | |
905 | xfree(signature); | |
906 | xfree(chost); | |
907 | xfree(pkalg); | |
908 | ||
909 | packet_send(); | |
910 | return 1; | |
911 | } | |
912 | ||
188adeb2 | 913 | /* find auth method */ |
914 | ||
188adeb2 | 915 | /* |
916 | * given auth method name, if configurable options permit this method fill | |
917 | * in auth_ident field and return true, otherwise return false. | |
918 | */ | |
396c147e | 919 | static int |
188adeb2 | 920 | authmethod_is_enabled(Authmethod *method) |
921 | { | |
922 | if (method == NULL) | |
923 | return 0; | |
924 | /* return false if options indicate this method is disabled */ | |
925 | if (method->enabled == NULL || *method->enabled == 0) | |
926 | return 0; | |
927 | /* return false if batch mode is enabled but method needs interactive mode */ | |
928 | if (method->batch_flag != NULL && *method->batch_flag != 0) | |
929 | return 0; | |
930 | return 1; | |
931 | } | |
a306f2dd | 932 | |
396c147e | 933 | static Authmethod * |
188adeb2 | 934 | authmethod_lookup(const char *name) |
935 | { | |
936 | Authmethod *method = NULL; | |
937 | if (name != NULL) | |
938 | for (method = authmethods; method->name != NULL; method++) | |
939 | if (strcmp(name, method->name) == 0) | |
940 | return method; | |
941 | debug2("Unrecognized authentication method name: %s", name ? name : "NULL"); | |
942 | return NULL; | |
943 | } | |
944 | ||
cab80f75 | 945 | /* XXX internal state */ |
946 | static Authmethod *current = NULL; | |
947 | static char *supported = NULL; | |
948 | static char *preferred = NULL; | |
188adeb2 | 949 | /* |
950 | * Given the authentication method list sent by the server, return the | |
951 | * next method we should try. If the server initially sends a nil list, | |
cd332296 | 952 | * use a built-in default list. |
2b87da3b | 953 | */ |
396c147e | 954 | static Authmethod * |
188adeb2 | 955 | authmethod_get(char *authlist) |
956 | { | |
cab80f75 | 957 | |
958 | char *name = NULL; | |
21b30f38 | 959 | u_int next; |
2b87da3b | 960 | |
188adeb2 | 961 | /* Use a suitable default if we're passed a nil list. */ |
962 | if (authlist == NULL || strlen(authlist) == 0) | |
cab80f75 | 963 | authlist = options.preferred_authentications; |
964 | ||
965 | if (supported == NULL || strcmp(authlist, supported) != 0) { | |
966 | debug3("start over, passed a different list %s", authlist); | |
967 | if (supported != NULL) | |
968 | xfree(supported); | |
969 | supported = xstrdup(authlist); | |
970 | preferred = options.preferred_authentications; | |
971 | debug3("preferred %s", preferred); | |
972 | current = NULL; | |
973 | } else if (current != NULL && authmethod_is_enabled(current)) | |
974 | return current; | |
188adeb2 | 975 | |
cab80f75 | 976 | for (;;) { |
977 | if ((name = match_list(preferred, supported, &next)) == NULL) { | |
978 | debug("no more auth methods to try"); | |
979 | current = NULL; | |
980 | return NULL; | |
981 | } | |
982 | preferred += next; | |
94ec8c6b | 983 | debug3("authmethod_lookup %s", name); |
cab80f75 | 984 | debug3("remaining preferred: %s", preferred); |
985 | if ((current = authmethod_lookup(name)) != NULL && | |
986 | authmethod_is_enabled(current)) { | |
94ec8c6b | 987 | debug3("authmethod_is_enabled %s", name); |
cab80f75 | 988 | debug("next auth method to try is %s", name); |
989 | return current; | |
94ec8c6b | 990 | } |
a306f2dd | 991 | } |
cab80f75 | 992 | } |
a22aff1f | 993 | |
ffb215be | 994 | static char * |
cab80f75 | 995 | authmethods_get(void) |
996 | { | |
997 | Authmethod *method = NULL; | |
3469eac4 | 998 | Buffer b; |
999 | char *list; | |
cab80f75 | 1000 | |
3469eac4 | 1001 | buffer_init(&b); |
cab80f75 | 1002 | for (method = authmethods; method->name != NULL; method++) { |
1003 | if (authmethod_is_enabled(method)) { | |
3469eac4 | 1004 | if (buffer_len(&b) > 0) |
1005 | buffer_append(&b, ",", 1); | |
1006 | buffer_append(&b, method->name, strlen(method->name)); | |
cab80f75 | 1007 | } |
1008 | } | |
3469eac4 | 1009 | buffer_append(&b, "\0", 1); |
1010 | list = xstrdup(buffer_ptr(&b)); | |
1011 | buffer_free(&b); | |
1012 | return list; | |
a306f2dd | 1013 | } |