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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" | |
9616313f | 26 | RCSID("$OpenBSD: sshconnect2.c,v 1.35 2001/01/04 22:21:26 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); | |
9616313f | 470 | void input_userauth_banner(int type, int plen, void *ctxt); |
188adeb2 | 471 | void input_userauth_error(int type, int plen, void *ctxt); |
94ec8c6b | 472 | void input_userauth_info_req(int type, int plen, void *ctxt); |
473 | ||
474 | int userauth_none(Authctxt *authctxt); | |
188adeb2 | 475 | int userauth_pubkey(Authctxt *authctxt); |
476 | int userauth_passwd(Authctxt *authctxt); | |
94ec8c6b | 477 | int userauth_kbdint(Authctxt *authctxt); |
188adeb2 | 478 | |
1e3b8b07 | 479 | void authmethod_clear(void); |
94ec8c6b | 480 | Authmethod *authmethod_get(char *authlist); |
481 | Authmethod *authmethod_lookup(const char *name); | |
188adeb2 | 482 | |
483 | Authmethod authmethods[] = { | |
484 | {"publickey", | |
485 | userauth_pubkey, | |
fa08c86b | 486 | &options.pubkey_authentication, |
188adeb2 | 487 | NULL}, |
488 | {"password", | |
489 | userauth_passwd, | |
490 | &options.password_authentication, | |
491 | &options.batch_mode}, | |
94ec8c6b | 492 | {"keyboard-interactive", |
493 | userauth_kbdint, | |
494 | &options.kbd_interactive_authentication, | |
495 | &options.batch_mode}, | |
496 | {"none", | |
497 | userauth_none, | |
498 | NULL, | |
499 | NULL}, | |
188adeb2 | 500 | {NULL, NULL, NULL, NULL} |
501 | }; | |
502 | ||
503 | void | |
504 | ssh_userauth2(const char *server_user, char *host) | |
505 | { | |
506 | Authctxt authctxt; | |
507 | int type; | |
508 | int plen; | |
509 | ||
510 | debug("send SSH2_MSG_SERVICE_REQUEST"); | |
511 | packet_start(SSH2_MSG_SERVICE_REQUEST); | |
512 | packet_put_cstring("ssh-userauth"); | |
513 | packet_send(); | |
514 | packet_write_wait(); | |
515 | type = packet_read(&plen); | |
516 | if (type != SSH2_MSG_SERVICE_ACCEPT) { | |
517 | fatal("denied SSH2_MSG_SERVICE_ACCEPT: %d", type); | |
518 | } | |
519 | if (packet_remaining() > 0) { | |
520 | char *reply = packet_get_string(&plen); | |
521 | debug("service_accept: %s", reply); | |
522 | xfree(reply); | |
523 | packet_done(); | |
524 | } else { | |
525 | debug("buggy server: service_accept w/o service"); | |
526 | } | |
527 | packet_done(); | |
528 | debug("got SSH2_MSG_SERVICE_ACCEPT"); | |
529 | ||
530 | /* setup authentication context */ | |
531 | authctxt.agent = ssh_get_authentication_connection(); | |
532 | authctxt.server_user = server_user; | |
533 | authctxt.host = host; | |
534 | authctxt.service = "ssh-connection"; /* service name */ | |
535 | authctxt.success = 0; | |
94ec8c6b | 536 | authctxt.method = authmethod_lookup("none"); |
537 | if (authctxt.method == NULL) | |
538 | fatal("ssh_userauth2: internal error: cannot send userauth none request"); | |
539 | authmethod_clear(); | |
188adeb2 | 540 | |
541 | /* initial userauth request */ | |
94ec8c6b | 542 | userauth_none(&authctxt); |
188adeb2 | 543 | |
544 | dispatch_init(&input_userauth_error); | |
545 | dispatch_set(SSH2_MSG_USERAUTH_SUCCESS, &input_userauth_success); | |
546 | dispatch_set(SSH2_MSG_USERAUTH_FAILURE, &input_userauth_failure); | |
9616313f | 547 | dispatch_set(SSH2_MSG_USERAUTH_BANNER, &input_userauth_banner); |
188adeb2 | 548 | dispatch_run(DISPATCH_BLOCK, &authctxt.success, &authctxt); /* loop until success */ |
549 | ||
550 | if (authctxt.agent != NULL) | |
551 | ssh_close_authentication_connection(authctxt.agent); | |
552 | ||
8abcdba4 | 553 | debug("ssh-userauth2 successful: method %s", authctxt.method->name); |
188adeb2 | 554 | } |
555 | void | |
556 | input_userauth_error(int type, int plen, void *ctxt) | |
557 | { | |
9616313f | 558 | fatal("input_userauth_error: bad message during authentication: " |
559 | "type %d", type); | |
560 | } | |
561 | void | |
562 | input_userauth_banner(int type, int plen, void *ctxt) | |
563 | { | |
564 | char *msg, *lang; | |
565 | debug3("input_userauth_banner"); | |
566 | msg = packet_get_string(NULL); | |
567 | lang = packet_get_string(NULL); | |
568 | fprintf(stderr, "%s", msg); | |
569 | xfree(msg); | |
570 | xfree(lang); | |
188adeb2 | 571 | } |
572 | void | |
573 | input_userauth_success(int type, int plen, void *ctxt) | |
574 | { | |
575 | Authctxt *authctxt = ctxt; | |
576 | if (authctxt == NULL) | |
577 | fatal("input_userauth_success: no authentication context"); | |
578 | authctxt->success = 1; /* break out */ | |
579 | } | |
580 | void | |
581 | input_userauth_failure(int type, int plen, void *ctxt) | |
582 | { | |
583 | Authmethod *method = NULL; | |
584 | Authctxt *authctxt = ctxt; | |
585 | char *authlist = NULL; | |
586 | int partial; | |
188adeb2 | 587 | |
588 | if (authctxt == NULL) | |
589 | fatal("input_userauth_failure: no authentication context"); | |
590 | ||
94ec8c6b | 591 | authlist = packet_get_string(NULL); |
188adeb2 | 592 | partial = packet_get_char(); |
593 | packet_done(); | |
594 | ||
595 | if (partial != 0) | |
596 | debug("partial success"); | |
597 | debug("authentications that can continue: %s", authlist); | |
598 | ||
599 | for (;;) { | |
188adeb2 | 600 | method = authmethod_get(authlist); |
601 | if (method == NULL) | |
602 | fatal("Unable to find an authentication method"); | |
94ec8c6b | 603 | authctxt->method = method; |
188adeb2 | 604 | if (method->userauth(authctxt) != 0) { |
94ec8c6b | 605 | debug2("we sent a %s packet, wait for reply", method->name); |
188adeb2 | 606 | break; |
607 | } else { | |
608 | debug2("we did not send a packet, disable method"); | |
609 | method->enabled = NULL; | |
610 | } | |
611 | } | |
612 | xfree(authlist); | |
613 | } | |
614 | ||
94ec8c6b | 615 | int |
616 | userauth_none(Authctxt *authctxt) | |
617 | { | |
618 | /* initial userauth request */ | |
619 | packet_start(SSH2_MSG_USERAUTH_REQUEST); | |
620 | packet_put_cstring(authctxt->server_user); | |
621 | packet_put_cstring(authctxt->service); | |
622 | packet_put_cstring(authctxt->method->name); | |
623 | packet_send(); | |
624 | packet_write_wait(); | |
625 | return 1; | |
626 | } | |
627 | ||
a306f2dd | 628 | int |
188adeb2 | 629 | userauth_passwd(Authctxt *authctxt) |
a306f2dd | 630 | { |
1d1ffb87 | 631 | static int attempt = 0; |
a306f2dd | 632 | char prompt[80]; |
633 | char *password; | |
634 | ||
fa649821 | 635 | if (attempt++ >= options.number_of_password_prompts) |
1d1ffb87 | 636 | return 0; |
637 | ||
fa649821 | 638 | if(attempt != 1) |
639 | error("Permission denied, please try again."); | |
640 | ||
a306f2dd | 641 | snprintf(prompt, sizeof(prompt), "%.30s@%.40s's password: ", |
188adeb2 | 642 | authctxt->server_user, authctxt->host); |
a306f2dd | 643 | password = read_passphrase(prompt, 0); |
644 | packet_start(SSH2_MSG_USERAUTH_REQUEST); | |
188adeb2 | 645 | packet_put_cstring(authctxt->server_user); |
646 | packet_put_cstring(authctxt->service); | |
94ec8c6b | 647 | packet_put_cstring(authctxt->method->name); |
a306f2dd | 648 | packet_put_char(0); |
649 | packet_put_cstring(password); | |
650 | memset(password, 0, strlen(password)); | |
651 | xfree(password); | |
652 | packet_send(); | |
653 | packet_write_wait(); | |
654 | return 1; | |
655 | } | |
656 | ||
2e73a022 | 657 | int |
188adeb2 | 658 | sign_and_send_pubkey(Authctxt *authctxt, Key *k, sign_cb_fn *sign_callback) |
a306f2dd | 659 | { |
660 | Buffer b; | |
1e3b8b07 | 661 | u_char *blob, *signature; |
a306f2dd | 662 | int bloblen, slen; |
74fc9186 | 663 | int skip = 0; |
2e73a022 | 664 | int ret = -1; |
94ec8c6b | 665 | int have_sig = 1; |
a306f2dd | 666 | |
cbc5abf9 | 667 | debug3("sign_and_send_pubkey"); |
fa08c86b | 668 | if (key_to_blob(k, &blob, &bloblen) == 0) { |
669 | /* we cannot handle this key */ | |
cbc5abf9 | 670 | debug3("sign_and_send_pubkey: cannot handle key"); |
fa08c86b | 671 | return 0; |
672 | } | |
a306f2dd | 673 | /* data to be signed */ |
674 | buffer_init(&b); | |
33de75a3 | 675 | if (datafellows & SSH_OLD_SESSIONID) { |
74fc9186 | 676 | buffer_append(&b, session_id2, session_id2_len); |
677 | skip = session_id2_len; | |
33de75a3 | 678 | } else { |
679 | buffer_put_string(&b, session_id2, session_id2_len); | |
680 | skip = buffer_len(&b); | |
74fc9186 | 681 | } |
a306f2dd | 682 | buffer_put_char(&b, SSH2_MSG_USERAUTH_REQUEST); |
188adeb2 | 683 | buffer_put_cstring(&b, authctxt->server_user); |
d0c832f3 | 684 | buffer_put_cstring(&b, |
cbc5abf9 | 685 | datafellows & SSH_BUG_PKSERVICE ? |
d0c832f3 | 686 | "ssh-userauth" : |
188adeb2 | 687 | authctxt->service); |
cbc5abf9 | 688 | if (datafellows & SSH_BUG_PKAUTH) { |
689 | buffer_put_char(&b, have_sig); | |
690 | } else { | |
691 | buffer_put_cstring(&b, authctxt->method->name); | |
692 | buffer_put_char(&b, have_sig); | |
693 | buffer_put_cstring(&b, key_ssh_name(k)); | |
694 | } | |
a306f2dd | 695 | buffer_put_string(&b, blob, bloblen); |
a306f2dd | 696 | |
697 | /* generate signature */ | |
188adeb2 | 698 | ret = (*sign_callback)(authctxt, k, &signature, &slen, buffer_ptr(&b), buffer_len(&b)); |
2e73a022 | 699 | if (ret == -1) { |
700 | xfree(blob); | |
701 | buffer_free(&b); | |
702 | return 0; | |
703 | } | |
fa08c86b | 704 | #ifdef DEBUG_PK |
a306f2dd | 705 | buffer_dump(&b); |
706 | #endif | |
cbc5abf9 | 707 | if (datafellows & SSH_BUG_PKSERVICE) { |
d0c832f3 | 708 | buffer_clear(&b); |
709 | buffer_append(&b, session_id2, session_id2_len); | |
710 | buffer_put_char(&b, SSH2_MSG_USERAUTH_REQUEST); | |
188adeb2 | 711 | buffer_put_cstring(&b, authctxt->server_user); |
712 | buffer_put_cstring(&b, authctxt->service); | |
94ec8c6b | 713 | buffer_put_cstring(&b, authctxt->method->name); |
714 | buffer_put_char(&b, have_sig); | |
cbc5abf9 | 715 | if (!(datafellows & SSH_BUG_PKAUTH)) |
716 | buffer_put_cstring(&b, key_ssh_name(k)); | |
d0c832f3 | 717 | buffer_put_string(&b, blob, bloblen); |
718 | } | |
719 | xfree(blob); | |
a306f2dd | 720 | /* append signature */ |
721 | buffer_put_string(&b, signature, slen); | |
722 | xfree(signature); | |
723 | ||
724 | /* skip session id and packet type */ | |
74fc9186 | 725 | if (buffer_len(&b) < skip + 1) |
188adeb2 | 726 | fatal("userauth_pubkey: internal error"); |
74fc9186 | 727 | buffer_consume(&b, skip + 1); |
a306f2dd | 728 | |
729 | /* put remaining data from buffer into packet */ | |
730 | packet_start(SSH2_MSG_USERAUTH_REQUEST); | |
731 | packet_put_raw(buffer_ptr(&b), buffer_len(&b)); | |
732 | buffer_free(&b); | |
733 | ||
734 | /* send */ | |
735 | packet_send(); | |
736 | packet_write_wait(); | |
2e73a022 | 737 | |
738 | return 1; | |
4c8722d9 | 739 | } |
740 | ||
188adeb2 | 741 | /* sign callback */ |
1e3b8b07 | 742 | int key_sign_cb(Authctxt *authctxt, Key *key, u_char **sigp, int *lenp, |
743 | u_char *data, int datalen) | |
188adeb2 | 744 | { |
fa08c86b | 745 | return key_sign(key, sigp, lenp, data, datalen); |
188adeb2 | 746 | } |
747 | ||
4c8722d9 | 748 | int |
188adeb2 | 749 | userauth_pubkey_identity(Authctxt *authctxt, char *filename) |
4c8722d9 | 750 | { |
751 | Key *k; | |
188adeb2 | 752 | int i, ret, try_next; |
4c8722d9 | 753 | struct stat st; |
754 | ||
755 | if (stat(filename, &st) != 0) { | |
756 | debug("key does not exist: %s", filename); | |
757 | return 0; | |
758 | } | |
759 | debug("try pubkey: %s", filename); | |
760 | ||
fa08c86b | 761 | k = key_new(KEY_UNSPEC); |
4c8722d9 | 762 | if (!load_private_key(filename, "", k, NULL)) { |
763 | int success = 0; | |
764 | char *passphrase; | |
765 | char prompt[300]; | |
766 | snprintf(prompt, sizeof prompt, | |
fa08c86b | 767 | "Enter passphrase for key '%.100s': ", filename); |
188adeb2 | 768 | for (i = 0; i < options.number_of_password_prompts; i++) { |
769 | passphrase = read_passphrase(prompt, 0); | |
770 | if (strcmp(passphrase, "") != 0) { | |
771 | success = load_private_key(filename, passphrase, k, NULL); | |
772 | try_next = 0; | |
773 | } else { | |
774 | debug2("no passphrase given, try next key"); | |
775 | try_next = 1; | |
776 | } | |
777 | memset(passphrase, 0, strlen(passphrase)); | |
778 | xfree(passphrase); | |
779 | if (success || try_next) | |
780 | break; | |
781 | debug2("bad passphrase given, try again..."); | |
782 | } | |
4c8722d9 | 783 | if (!success) { |
784 | key_free(k); | |
785 | return 0; | |
786 | } | |
787 | } | |
fa08c86b | 788 | ret = sign_and_send_pubkey(authctxt, k, key_sign_cb); |
2e73a022 | 789 | key_free(k); |
790 | return ret; | |
791 | } | |
792 | ||
188adeb2 | 793 | /* sign callback */ |
1e3b8b07 | 794 | int agent_sign_cb(Authctxt *authctxt, Key *key, u_char **sigp, int *lenp, |
795 | u_char *data, int datalen) | |
2e73a022 | 796 | { |
188adeb2 | 797 | return ssh_agent_sign(authctxt->agent, key, sigp, lenp, data, datalen); |
2e73a022 | 798 | } |
799 | ||
800 | int | |
188adeb2 | 801 | userauth_pubkey_agent(Authctxt *authctxt) |
2e73a022 | 802 | { |
803 | static int called = 0; | |
fa08c86b | 804 | int ret = 0; |
2e73a022 | 805 | char *comment; |
806 | Key *k; | |
2e73a022 | 807 | |
808 | if (called == 0) { | |
fa08c86b | 809 | if (ssh_get_num_identities(authctxt->agent, 2) == 0) |
810 | debug2("userauth_pubkey_agent: no keys at all"); | |
188adeb2 | 811 | called = 1; |
2e73a022 | 812 | } |
fa08c86b | 813 | k = ssh_get_next_identity(authctxt->agent, &comment, 2); |
188adeb2 | 814 | if (k == NULL) { |
fa08c86b | 815 | debug2("userauth_pubkey_agent: no more keys"); |
816 | } else { | |
817 | debug("userauth_pubkey_agent: trying agent key %s", comment); | |
818 | xfree(comment); | |
819 | ret = sign_and_send_pubkey(authctxt, k, agent_sign_cb); | |
820 | key_free(k); | |
188adeb2 | 821 | } |
fa08c86b | 822 | if (ret == 0) |
823 | debug2("userauth_pubkey_agent: no message sent"); | |
2e73a022 | 824 | return ret; |
a306f2dd | 825 | } |
826 | ||
188adeb2 | 827 | int |
828 | userauth_pubkey(Authctxt *authctxt) | |
a306f2dd | 829 | { |
188adeb2 | 830 | static int idx = 0; |
831 | int sent = 0; | |
832 | ||
fa08c86b | 833 | if (authctxt->agent != NULL) { |
834 | do { | |
835 | sent = userauth_pubkey_agent(authctxt); | |
836 | } while(!sent && authctxt->agent->howmany > 0); | |
837 | } | |
838 | while (!sent && idx < options.num_identity_files) { | |
839 | if (options.identity_files_type[idx] != KEY_RSA1) | |
840 | sent = userauth_pubkey_identity(authctxt, | |
841 | options.identity_files[idx]); | |
842 | idx++; | |
843 | } | |
188adeb2 | 844 | return sent; |
845 | } | |
a306f2dd | 846 | |
94ec8c6b | 847 | /* |
848 | * Send userauth request message specifying keyboard-interactive method. | |
849 | */ | |
850 | int | |
851 | userauth_kbdint(Authctxt *authctxt) | |
852 | { | |
853 | static int attempt = 0; | |
854 | ||
855 | if (attempt++ >= options.number_of_password_prompts) | |
856 | return 0; | |
857 | ||
858 | debug2("userauth_kbdint"); | |
859 | packet_start(SSH2_MSG_USERAUTH_REQUEST); | |
860 | packet_put_cstring(authctxt->server_user); | |
861 | packet_put_cstring(authctxt->service); | |
862 | packet_put_cstring(authctxt->method->name); | |
863 | packet_put_cstring(""); /* lang */ | |
864 | packet_put_cstring(options.kbd_interactive_devices ? | |
865 | options.kbd_interactive_devices : ""); | |
866 | packet_send(); | |
867 | packet_write_wait(); | |
868 | ||
869 | dispatch_set(SSH2_MSG_USERAUTH_INFO_REQUEST, &input_userauth_info_req); | |
870 | return 1; | |
871 | } | |
872 | ||
873 | /* | |
874 | * parse SSH2_MSG_USERAUTH_INFO_REQUEST, prompt user and send | |
875 | * SSH2_MSG_USERAUTH_INFO_RESPONSE | |
876 | */ | |
877 | void | |
878 | input_userauth_info_req(int type, int plen, void *ctxt) | |
879 | { | |
880 | Authctxt *authctxt = ctxt; | |
881 | char *name = NULL; | |
882 | char *inst = NULL; | |
883 | char *lang = NULL; | |
884 | char *prompt = NULL; | |
885 | char *response = NULL; | |
1e3b8b07 | 886 | u_int num_prompts, i; |
94ec8c6b | 887 | int echo = 0; |
888 | ||
889 | debug2("input_userauth_info_req"); | |
890 | ||
891 | if (authctxt == NULL) | |
892 | fatal("input_userauth_info_req: no authentication context"); | |
893 | ||
894 | name = packet_get_string(NULL); | |
895 | inst = packet_get_string(NULL); | |
896 | lang = packet_get_string(NULL); | |
897 | ||
898 | if (strlen(name) > 0) | |
899 | cli_mesg(name); | |
900 | xfree(name); | |
901 | ||
902 | if (strlen(inst) > 0) | |
903 | cli_mesg(inst); | |
904 | xfree(inst); | |
905 | xfree(lang); /* unused */ | |
906 | ||
907 | num_prompts = packet_get_int(); | |
908 | /* | |
909 | * Begin to build info response packet based on prompts requested. | |
910 | * We commit to providing the correct number of responses, so if | |
911 | * further on we run into a problem that prevents this, we have to | |
912 | * be sure and clean this up and send a correct error response. | |
913 | */ | |
914 | packet_start(SSH2_MSG_USERAUTH_INFO_RESPONSE); | |
915 | packet_put_int(num_prompts); | |
916 | ||
917 | for (i = 0; i < num_prompts; i++) { | |
918 | prompt = packet_get_string(NULL); | |
919 | echo = packet_get_char(); | |
920 | ||
921 | response = cli_prompt(prompt, echo); | |
922 | ||
923 | packet_put_cstring(response); | |
924 | memset(response, 0, strlen(response)); | |
925 | xfree(response); | |
926 | xfree(prompt); | |
927 | } | |
928 | packet_done(); /* done with parsing incoming message. */ | |
929 | ||
930 | packet_send(); | |
931 | packet_write_wait(); | |
932 | } | |
a306f2dd | 933 | |
188adeb2 | 934 | /* find auth method */ |
935 | ||
936 | #define DELIM "," | |
937 | ||
938 | static char *def_authlist = "publickey,password"; | |
939 | static char *authlist_current = NULL; /* clean copy used for comparison */ | |
940 | static char *authname_current = NULL; /* last used auth method */ | |
941 | static char *authlist_working = NULL; /* copy that gets modified by strtok_r() */ | |
942 | static char *authlist_state = NULL; /* state variable for strtok_r() */ | |
943 | ||
944 | /* | |
945 | * Before starting to use a new authentication method list sent by the | |
946 | * server, reset internal variables. This should also be called when | |
947 | * finished processing server list to free resources. | |
948 | */ | |
949 | void | |
1e3b8b07 | 950 | authmethod_clear(void) |
188adeb2 | 951 | { |
952 | if (authlist_current != NULL) { | |
953 | xfree(authlist_current); | |
954 | authlist_current = NULL; | |
a306f2dd | 955 | } |
188adeb2 | 956 | if (authlist_working != NULL) { |
957 | xfree(authlist_working); | |
958 | authlist_working = NULL; | |
a306f2dd | 959 | } |
188adeb2 | 960 | if (authname_current != NULL) { |
961 | xfree(authname_current); | |
962 | authlist_state = NULL; | |
963 | } | |
964 | if (authlist_state != NULL) | |
965 | authlist_state = NULL; | |
966 | return; | |
967 | } | |
a306f2dd | 968 | |
188adeb2 | 969 | /* |
970 | * given auth method name, if configurable options permit this method fill | |
971 | * in auth_ident field and return true, otherwise return false. | |
972 | */ | |
973 | int | |
974 | authmethod_is_enabled(Authmethod *method) | |
975 | { | |
976 | if (method == NULL) | |
977 | return 0; | |
978 | /* return false if options indicate this method is disabled */ | |
979 | if (method->enabled == NULL || *method->enabled == 0) | |
980 | return 0; | |
981 | /* return false if batch mode is enabled but method needs interactive mode */ | |
982 | if (method->batch_flag != NULL && *method->batch_flag != 0) | |
983 | return 0; | |
984 | return 1; | |
985 | } | |
a306f2dd | 986 | |
188adeb2 | 987 | Authmethod * |
988 | authmethod_lookup(const char *name) | |
989 | { | |
990 | Authmethod *method = NULL; | |
991 | if (name != NULL) | |
992 | for (method = authmethods; method->name != NULL; method++) | |
993 | if (strcmp(name, method->name) == 0) | |
994 | return method; | |
995 | debug2("Unrecognized authentication method name: %s", name ? name : "NULL"); | |
996 | return NULL; | |
997 | } | |
998 | ||
999 | /* | |
1000 | * Given the authentication method list sent by the server, return the | |
1001 | * next method we should try. If the server initially sends a nil list, | |
1002 | * use a built-in default list. If the server sends a nil list after | |
1003 | * previously sending a valid list, continue using the list originally | |
1004 | * sent. | |
1005 | */ | |
1006 | ||
1007 | Authmethod * | |
1008 | authmethod_get(char *authlist) | |
1009 | { | |
a22aff1f | 1010 | char *name = NULL, *authname_old; |
188adeb2 | 1011 | Authmethod *method = NULL; |
1012 | ||
1013 | /* Use a suitable default if we're passed a nil list. */ | |
1014 | if (authlist == NULL || strlen(authlist) == 0) | |
1015 | authlist = def_authlist; | |
1016 | ||
1017 | if (authlist_current == NULL || strcmp(authlist, authlist_current) != 0) { | |
1018 | /* start over if passed a different list */ | |
94ec8c6b | 1019 | debug3("start over, passed a different list"); |
188adeb2 | 1020 | authmethod_clear(); |
1021 | authlist_current = xstrdup(authlist); | |
1022 | authlist_working = xstrdup(authlist); | |
1023 | name = strtok_r(authlist_working, DELIM, &authlist_state); | |
1024 | } else { | |
1025 | /* | |
1026 | * try to use previously used authentication method | |
1027 | * or continue to use previously passed list | |
1028 | */ | |
1029 | name = (authname_current != NULL) ? | |
1030 | authname_current : strtok_r(NULL, DELIM, &authlist_state); | |
1031 | } | |
1032 | ||
1033 | while (name != NULL) { | |
94ec8c6b | 1034 | debug3("authmethod_lookup %s", name); |
188adeb2 | 1035 | method = authmethod_lookup(name); |
94ec8c6b | 1036 | if (method != NULL && authmethod_is_enabled(method)) { |
1037 | debug3("authmethod_is_enabled %s", name); | |
a306f2dd | 1038 | break; |
94ec8c6b | 1039 | } |
188adeb2 | 1040 | name = strtok_r(NULL, DELIM, &authlist_state); |
94ec8c6b | 1041 | method = NULL; |
188adeb2 | 1042 | } |
1043 | ||
a22aff1f | 1044 | authname_old = authname_current; |
94ec8c6b | 1045 | if (method != NULL) { |
188adeb2 | 1046 | debug("next auth method to try is %s", name); |
1047 | authname_current = xstrdup(name); | |
188adeb2 | 1048 | } else { |
1049 | debug("no more auth methods to try"); | |
1050 | authname_current = NULL; | |
a306f2dd | 1051 | } |
a22aff1f | 1052 | |
1053 | if (authname_old != NULL) | |
1054 | xfree(authname_old); | |
1055 | ||
1056 | return (method); | |
a306f2dd | 1057 | } |