Annotation of src/usr.bin/ssh/sshconnect1.c, Revision 1.37
1.1 markus 1: /*
2: * Author: Tatu Ylonen <ylo@cs.hut.fi>
3: * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
4: * All rights reserved
5: * Code to connect to a remote host, and to perform the client side of the
6: * login (authentication) dialog.
7: *
1.6 deraadt 8: * As far as I am concerned, the code I have written for this software
9: * can be used freely for any purpose. Any derived versions of this
10: * software must be clearly marked as such, and if the derived work is
11: * incompatible with the protocol description in the RFC file, it must be
12: * called by a name other than "ssh" or "Secure Shell".
1.1 markus 13: */
14:
15: #include "includes.h"
1.37 ! dugsong 16: RCSID("$OpenBSD: sshconnect1.c,v 1.36 2001/06/23 22:37:46 markus Exp $");
1.1 markus 17:
18: #include <openssl/bn.h>
19: #include <openssl/evp.h>
20:
1.18 markus 21: #ifdef KRB4
22: #include <krb.h>
23: #endif
1.37 ! dugsong 24: #ifdef KRB5
! 25: #include <krb5.h>
! 26: #endif
1.18 markus 27: #ifdef AFS
28: #include <kafs.h>
1.19 markus 29: #include "radix.h"
1.18 markus 30: #endif
31:
32: #include "ssh.h"
33: #include "ssh1.h"
1.1 markus 34: #include "xmalloc.h"
35: #include "rsa.h"
36: #include "buffer.h"
37: #include "packet.h"
38: #include "mpaux.h"
39: #include "uidswap.h"
1.18 markus 40: #include "log.h"
1.1 markus 41: #include "readconf.h"
42: #include "key.h"
1.4 markus 43: #include "authfd.h"
1.1 markus 44: #include "sshconnect.h"
45: #include "authfile.h"
1.18 markus 46: #include "readpass.h"
47: #include "cipher.h"
48: #include "canohost.h"
1.37 ! dugsong 49: #include "auth.h"
1.1 markus 50:
51: /* Session id for the current session. */
1.13 markus 52: u_char session_id[16];
53: u_int supported_authentications = 0;
1.1 markus 54:
55: extern Options options;
56: extern char *__progname;
57:
58: /*
59: * Checks if the user has an authentication agent, and if so, tries to
60: * authenticate using the agent.
61: */
1.35 itojun 62: static int
1.24 itojun 63: try_agent_authentication(void)
1.1 markus 64: {
1.5 markus 65: int type;
1.1 markus 66: char *comment;
67: AuthenticationConnection *auth;
1.13 markus 68: u_char response[16];
69: u_int i;
1.5 markus 70: int plen, clen;
71: Key *key;
72: BIGNUM *challenge;
1.1 markus 73:
74: /* Get connection to the agent. */
75: auth = ssh_get_authentication_connection();
76: if (!auth)
77: return 0;
78:
79: challenge = BN_new();
80:
81: /* Loop through identities served by the agent. */
1.5 markus 82: for (key = ssh_get_first_identity(auth, &comment, 1);
83: key != NULL;
84: key = ssh_get_next_identity(auth, &comment, 1)) {
1.1 markus 85:
86: /* Try this identity. */
87: debug("Trying RSA authentication via agent with '%.100s'", comment);
88: xfree(comment);
89:
90: /* Tell the server that we are willing to authenticate using this key. */
91: packet_start(SSH_CMSG_AUTH_RSA);
1.5 markus 92: packet_put_bignum(key->rsa->n);
1.1 markus 93: packet_send();
94: packet_write_wait();
95:
96: /* Wait for server's response. */
97: type = packet_read(&plen);
98:
99: /* The server sends failure if it doesn\'t like our key or
100: does not support RSA authentication. */
101: if (type == SSH_SMSG_FAILURE) {
102: debug("Server refused our key.");
1.5 markus 103: key_free(key);
1.1 markus 104: continue;
105: }
106: /* Otherwise it should have sent a challenge. */
107: if (type != SSH_SMSG_AUTH_RSA_CHALLENGE)
108: packet_disconnect("Protocol error during RSA authentication: %d",
109: type);
110:
111: packet_get_bignum(challenge, &clen);
112:
113: packet_integrity_check(plen, clen, type);
114:
115: debug("Received RSA challenge from server.");
116:
117: /* Ask the agent to decrypt the challenge. */
1.5 markus 118: if (!ssh_decrypt_challenge(auth, key, challenge, session_id, 1, response)) {
119: /*
120: * The agent failed to authenticate this identifier
121: * although it advertised it supports this. Just
122: * return a wrong value.
123: */
1.1 markus 124: log("Authentication agent failed to decrypt challenge.");
125: memset(response, 0, sizeof(response));
126: }
1.5 markus 127: key_free(key);
1.1 markus 128: debug("Sending response to RSA challenge.");
129:
130: /* Send the decrypted challenge back to the server. */
131: packet_start(SSH_CMSG_AUTH_RSA_RESPONSE);
132: for (i = 0; i < 16; i++)
133: packet_put_char(response[i]);
134: packet_send();
135: packet_write_wait();
136:
137: /* Wait for response from the server. */
138: type = packet_read(&plen);
139:
140: /* The server returns success if it accepted the authentication. */
141: if (type == SSH_SMSG_SUCCESS) {
1.14 markus 142: ssh_close_authentication_connection(auth);
1.5 markus 143: BN_clear_free(challenge);
1.1 markus 144: debug("RSA authentication accepted by server.");
145: return 1;
146: }
147: /* Otherwise it should return failure. */
148: if (type != SSH_SMSG_FAILURE)
149: packet_disconnect("Protocol error waiting RSA auth response: %d",
150: type);
151: }
1.14 markus 152: ssh_close_authentication_connection(auth);
1.1 markus 153: BN_clear_free(challenge);
154: debug("RSA authentication using agent refused.");
155: return 0;
156: }
157:
158: /*
159: * Computes the proper response to a RSA challenge, and sends the response to
160: * the server.
161: */
1.35 itojun 162: static void
1.1 markus 163: respond_to_rsa_challenge(BIGNUM * challenge, RSA * prv)
164: {
1.13 markus 165: u_char buf[32], response[16];
1.1 markus 166: MD5_CTX md;
167: int i, len;
168:
169: /* Decrypt the challenge using the private key. */
1.21 markus 170: /* XXX think about Bleichenbacher, too */
171: if (rsa_private_decrypt(challenge, challenge, prv) <= 0)
172: packet_disconnect(
173: "respond_to_rsa_challenge: rsa_private_decrypt failed");
1.1 markus 174:
175: /* Compute the response. */
176: /* The response is MD5 of decrypted challenge plus session id. */
177: len = BN_num_bytes(challenge);
178: if (len <= 0 || len > sizeof(buf))
1.21 markus 179: packet_disconnect(
180: "respond_to_rsa_challenge: bad challenge length %d", len);
1.1 markus 181:
182: memset(buf, 0, sizeof(buf));
183: BN_bn2bin(challenge, buf + sizeof(buf) - len);
184: MD5_Init(&md);
185: MD5_Update(&md, buf, 32);
186: MD5_Update(&md, session_id, 16);
187: MD5_Final(response, &md);
188:
189: debug("Sending response to host key RSA challenge.");
190:
191: /* Send the response back to the server. */
192: packet_start(SSH_CMSG_AUTH_RSA_RESPONSE);
193: for (i = 0; i < 16; i++)
194: packet_put_char(response[i]);
195: packet_send();
196: packet_write_wait();
197:
198: memset(buf, 0, sizeof(buf));
199: memset(response, 0, sizeof(response));
200: memset(&md, 0, sizeof(md));
201: }
202:
203: /*
204: * Checks if the user has authentication file, and if so, tries to authenticate
205: * the user using it.
206: */
1.35 itojun 207: static int
1.1 markus 208: try_rsa_authentication(const char *authfile)
209: {
210: BIGNUM *challenge;
1.36 markus 211: Key *public, *private;
212: char buf[300], *passphrase, *comment;
213: int i, type, quit, plen, clen;
1.1 markus 214:
215: /* Try to load identification for the authentication key. */
1.29 markus 216: /* XXKEYLOAD */
217: public = key_load_public_type(KEY_RSA1, authfile, &comment);
218: if (public == NULL) {
1.1 markus 219: /* Could not load it. Fail. */
220: return 0;
221: }
222: debug("Trying RSA authentication with key '%.100s'", comment);
223:
224: /* Tell the server that we are willing to authenticate using this key. */
225: packet_start(SSH_CMSG_AUTH_RSA);
226: packet_put_bignum(public->rsa->n);
227: packet_send();
228: packet_write_wait();
229:
230: /* We no longer need the public key. */
231: key_free(public);
232:
233: /* Wait for server's response. */
234: type = packet_read(&plen);
235:
236: /*
237: * The server responds with failure if it doesn\'t like our key or
238: * doesn\'t support RSA authentication.
239: */
240: if (type == SSH_SMSG_FAILURE) {
241: debug("Server refused our key.");
242: xfree(comment);
243: return 0;
244: }
245: /* Otherwise, the server should respond with a challenge. */
246: if (type != SSH_SMSG_AUTH_RSA_CHALLENGE)
247: packet_disconnect("Protocol error during RSA authentication: %d", type);
248:
249: /* Get the challenge from the packet. */
250: challenge = BN_new();
251: packet_get_bignum(challenge, &clen);
252:
253: packet_integrity_check(plen, clen, type);
254:
255: debug("Received RSA challenge from server.");
256:
257: /*
258: * Load the private key. Try first with empty passphrase; if it
259: * fails, ask for a passphrase.
260: */
1.29 markus 261: private = key_load_private_type(KEY_RSA1, authfile, "", NULL);
1.36 markus 262: if (private == NULL && !options.batch_mode) {
263: snprintf(buf, sizeof(buf),
264: "Enter passphrase for RSA key '%.100s': ", comment);
265: for (i = 0; i < options.number_of_password_prompts; i++) {
1.1 markus 266: passphrase = read_passphrase(buf, 0);
1.36 markus 267: if (strcmp(passphrase, "") != 0) {
268: private = key_load_private_type(KEY_RSA1,
269: authfile, passphrase, NULL);
270: quit = 0;
271: } else {
272: debug2("no passphrase given, try next key");
273: quit = 1;
274: }
1.1 markus 275: memset(passphrase, 0, strlen(passphrase));
276: xfree(passphrase);
1.36 markus 277: if (private != NULL || quit)
278: break;
279: debug2("bad passphrase given, try again...");
1.1 markus 280: }
281: }
282: /* We no longer need the comment. */
283: xfree(comment);
1.36 markus 284:
285: if (private == NULL) {
286: if (!options.batch_mode)
287: error("Bad passphrase.");
288:
289: /* Send a dummy response packet to avoid protocol error. */
290: packet_start(SSH_CMSG_AUTH_RSA_RESPONSE);
291: for (i = 0; i < 16; i++)
292: packet_put_char(0);
293: packet_send();
294: packet_write_wait();
295:
296: /* Expect the server to reject it... */
297: packet_read_expect(&plen, SSH_SMSG_FAILURE);
298: BN_clear_free(challenge);
299: return 0;
300: }
1.1 markus 301:
302: /* Compute and send a response to the challenge. */
303: respond_to_rsa_challenge(challenge, private->rsa);
304:
305: /* Destroy the private key. */
306: key_free(private);
307:
308: /* We no longer need the challenge. */
309: BN_clear_free(challenge);
310:
311: /* Wait for response from the server. */
312: type = packet_read(&plen);
313: if (type == SSH_SMSG_SUCCESS) {
314: debug("RSA authentication accepted by server.");
315: return 1;
316: }
317: if (type != SSH_SMSG_FAILURE)
318: packet_disconnect("Protocol error waiting RSA auth response: %d", type);
319: debug("RSA authentication refused.");
320: return 0;
321: }
322:
323: /*
324: * Tries to authenticate the user using combined rhosts or /etc/hosts.equiv
325: * authentication and RSA host authentication.
326: */
1.35 itojun 327: static int
1.29 markus 328: try_rhosts_rsa_authentication(const char *local_user, Key * host_key)
1.1 markus 329: {
330: int type;
331: BIGNUM *challenge;
332: int plen, clen;
333:
334: debug("Trying rhosts or /etc/hosts.equiv with RSA host authentication.");
335:
336: /* Tell the server that we are willing to authenticate using this key. */
337: packet_start(SSH_CMSG_AUTH_RHOSTS_RSA);
1.33 markus 338: packet_put_cstring(local_user);
1.29 markus 339: packet_put_int(BN_num_bits(host_key->rsa->n));
340: packet_put_bignum(host_key->rsa->e);
341: packet_put_bignum(host_key->rsa->n);
1.1 markus 342: packet_send();
343: packet_write_wait();
344:
345: /* Wait for server's response. */
346: type = packet_read(&plen);
347:
348: /* The server responds with failure if it doesn't admit our
349: .rhosts authentication or doesn't know our host key. */
350: if (type == SSH_SMSG_FAILURE) {
351: debug("Server refused our rhosts authentication or host key.");
352: return 0;
353: }
354: /* Otherwise, the server should respond with a challenge. */
355: if (type != SSH_SMSG_AUTH_RSA_CHALLENGE)
356: packet_disconnect("Protocol error during RSA authentication: %d", type);
357:
358: /* Get the challenge from the packet. */
359: challenge = BN_new();
360: packet_get_bignum(challenge, &clen);
361:
362: packet_integrity_check(plen, clen, type);
363:
364: debug("Received RSA challenge for host key from server.");
365:
366: /* Compute a response to the challenge. */
1.29 markus 367: respond_to_rsa_challenge(challenge, host_key->rsa);
1.1 markus 368:
369: /* We no longer need the challenge. */
370: BN_clear_free(challenge);
371:
372: /* Wait for response from the server. */
373: type = packet_read(&plen);
374: if (type == SSH_SMSG_SUCCESS) {
375: debug("Rhosts or /etc/hosts.equiv with RSA host authentication accepted by server.");
376: return 1;
377: }
378: if (type != SSH_SMSG_FAILURE)
379: packet_disconnect("Protocol error waiting RSA auth response: %d", type);
380: debug("Rhosts or /etc/hosts.equiv with RSA host authentication refused.");
381: return 0;
382: }
383:
384: #ifdef KRB4
1.35 itojun 385: static int
1.37 ! dugsong 386: try_krb4_authentication(void)
1.1 markus 387: {
388: KTEXT_ST auth; /* Kerberos data */
389: char *reply;
390: char inst[INST_SZ];
391: char *realm;
392: CREDENTIALS cred;
393: int r, type, plen;
394: socklen_t slen;
395: Key_schedule schedule;
396: u_long checksum, cksum;
397: MSG_DAT msg_data;
398: struct sockaddr_in local, foreign;
399: struct stat st;
400:
401: /* Don't do anything if we don't have any tickets. */
402: if (stat(tkt_string(), &st) < 0)
403: return 0;
1.37 ! dugsong 404:
! 405: strlcpy(inst, (char *)krb_get_phost(get_canonical_hostname(1)),
! 406: INST_SZ);
! 407:
! 408: realm = (char *)krb_realmofhost(get_canonical_hostname(1));
1.1 markus 409: if (!realm) {
1.37 ! dugsong 410: debug("Kerberos v4: no realm for %s", get_canonical_hostname(1));
1.1 markus 411: return 0;
412: }
413: /* This can really be anything. */
1.37 ! dugsong 414: checksum = (u_long)getpid();
! 415:
1.1 markus 416: r = krb_mk_req(&auth, KRB4_SERVICE_NAME, inst, realm, checksum);
417: if (r != KSUCCESS) {
1.37 ! dugsong 418: debug("Kerberos v4 krb_mk_req failed: %s", krb_err_txt[r]);
1.1 markus 419: return 0;
420: }
421: /* Get session key to decrypt the server's reply with. */
422: r = krb_get_cred(KRB4_SERVICE_NAME, inst, realm, &cred);
423: if (r != KSUCCESS) {
424: debug("get_cred failed: %s", krb_err_txt[r]);
425: return 0;
426: }
427: des_key_sched((des_cblock *) cred.session, schedule);
1.37 ! dugsong 428:
1.1 markus 429: /* Send authentication info to server. */
430: packet_start(SSH_CMSG_AUTH_KERBEROS);
431: packet_put_string((char *) auth.dat, auth.length);
432: packet_send();
433: packet_write_wait();
1.37 ! dugsong 434:
1.1 markus 435: /* Zero the buffer. */
436: (void) memset(auth.dat, 0, MAX_KTXT_LEN);
1.37 ! dugsong 437:
1.1 markus 438: slen = sizeof(local);
439: memset(&local, 0, sizeof(local));
440: if (getsockname(packet_get_connection_in(),
1.37 ! dugsong 441: (struct sockaddr *)&local, &slen) < 0)
1.1 markus 442: debug("getsockname failed: %s", strerror(errno));
1.37 ! dugsong 443:
1.1 markus 444: slen = sizeof(foreign);
445: memset(&foreign, 0, sizeof(foreign));
446: if (getpeername(packet_get_connection_in(),
1.37 ! dugsong 447: (struct sockaddr *)&foreign, &slen) < 0) {
1.1 markus 448: debug("getpeername failed: %s", strerror(errno));
449: fatal_cleanup();
450: }
451: /* Get server reply. */
452: type = packet_read(&plen);
453: switch (type) {
454: case SSH_SMSG_FAILURE:
455: /* Should really be SSH_SMSG_AUTH_KERBEROS_FAILURE */
1.37 ! dugsong 456: debug("Kerberos v4 authentication failed.");
1.1 markus 457: return 0;
458: break;
1.37 ! dugsong 459:
1.1 markus 460: case SSH_SMSG_AUTH_KERBEROS_RESPONSE:
461: /* SSH_SMSG_AUTH_KERBEROS_SUCCESS */
1.37 ! dugsong 462: debug("Kerberos v4 authentication accepted.");
! 463:
1.1 markus 464: /* Get server's response. */
1.13 markus 465: reply = packet_get_string((u_int *) &auth.length);
1.1 markus 466: memcpy(auth.dat, reply, auth.length);
467: xfree(reply);
1.37 ! dugsong 468:
1.1 markus 469: packet_integrity_check(plen, 4 + auth.length, type);
1.37 ! dugsong 470:
1.1 markus 471: /*
472: * If his response isn't properly encrypted with the session
473: * key, and the decrypted checksum fails to match, he's
474: * bogus. Bail out.
475: */
476: r = krb_rd_priv(auth.dat, auth.length, schedule, &cred.session,
1.37 ! dugsong 477: &foreign, &local, &msg_data);
1.1 markus 478: if (r != KSUCCESS) {
1.37 ! dugsong 479: debug("Kerberos v4 krb_rd_priv failed: %s",
! 480: krb_err_txt[r]);
! 481: packet_disconnect("Kerberos v4 challenge failed!");
1.1 markus 482: }
483: /* Fetch the (incremented) checksum that we supplied in the request. */
1.37 ! dugsong 484: memcpy((char *)&cksum, (char *)msg_data.app_data,
! 485: sizeof(cksum));
1.1 markus 486: cksum = ntohl(cksum);
1.37 ! dugsong 487:
1.1 markus 488: /* If it matches, we're golden. */
489: if (cksum == checksum + 1) {
1.37 ! dugsong 490: debug("Kerberos v4 challenge successful.");
1.1 markus 491: return 1;
492: } else
1.37 ! dugsong 493: packet_disconnect("Kerberos v4 challenge failed!");
1.1 markus 494: break;
1.37 ! dugsong 495:
1.1 markus 496: default:
1.37 ! dugsong 497: packet_disconnect("Protocol error on Kerberos v4 response: %d", type);
1.1 markus 498: }
499: return 0;
500: }
501:
502: #endif /* KRB4 */
503:
1.37 ! dugsong 504: #ifdef KRB5
! 505: static int
! 506: try_krb5_authentication(krb5_context *context, krb5_auth_context *auth_context)
! 507: {
! 508: krb5_error_code problem;
! 509: const char *tkfile;
! 510: struct stat buf;
! 511: krb5_ccache ccache = NULL;
! 512: const char *remotehost;
! 513: krb5_data ap;
! 514: int type, payload_len;
! 515: krb5_ap_rep_enc_part *reply = NULL;
! 516: int ret;
! 517:
! 518: memset(&ap, 0, sizeof(ap));
! 519:
! 520: problem = krb5_init_context(context);
! 521: if (problem) {
! 522: debug("Kerberos v5: krb5_init_context failed");
! 523: ret = 0;
! 524: goto out;
! 525: }
! 526:
! 527: tkfile = krb5_cc_default_name(*context);
! 528: if (strncmp(tkfile, "FILE:", 5) == 0)
! 529: tkfile += 5;
! 530:
! 531: if (stat(tkfile, &buf) == 0 && getuid() != buf.st_uid) {
! 532: debug("Kerberos v5: could not get default ccache (permission denied).");
! 533: ret = 0;
! 534: goto out;
! 535: }
! 536:
! 537: problem = krb5_cc_default(*context, &ccache);
! 538: if (problem) {
! 539: debug("Kerberos v5: krb5_cc_default failed: %s",
! 540: krb5_get_err_text(*context, problem));
! 541: ret = 0;
! 542: goto out;
! 543: }
! 544:
! 545: remotehost = get_canonical_hostname(1);
! 546:
! 547: problem = krb5_mk_req(*context, auth_context, AP_OPTS_MUTUAL_REQUIRED,
! 548: "host", remotehost, NULL, ccache, &ap);
! 549: if (problem) {
! 550: debug("Kerberos v5: krb5_mk_req failed: %s",
! 551: krb5_get_err_text(*context, problem));
! 552: ret = 0;
! 553: goto out;
! 554: }
! 555:
! 556: packet_start(SSH_CMSG_AUTH_KERBEROS);
! 557: packet_put_string((char *) ap.data, ap.length);
! 558: packet_send();
! 559: packet_write_wait();
! 560:
! 561: xfree(ap.data);
! 562: ap.length = 0;
! 563:
! 564: type = packet_read(&payload_len);
! 565: switch (type) {
! 566: case SSH_SMSG_FAILURE:
! 567: /* Should really be SSH_SMSG_AUTH_KERBEROS_FAILURE */
! 568: debug("Kerberos v5 authentication failed.");
! 569: ret = 0;
! 570: break;
! 571:
! 572: case SSH_SMSG_AUTH_KERBEROS_RESPONSE:
! 573: /* SSH_SMSG_AUTH_KERBEROS_SUCCESS */
! 574: debug("Kerberos v5 authentication accepted.");
! 575:
! 576: /* Get server's response. */
! 577: ap.data = packet_get_string((unsigned int *) &ap.length);
! 578:
! 579: packet_integrity_check(payload_len, 4 + ap.length, type);
! 580: /* XXX je to dobre? */
! 581:
! 582: problem = krb5_rd_rep(*context, *auth_context, &ap, &reply);
! 583: if (problem) {
! 584: ret = 0;
! 585: }
! 586: ret = 1;
! 587: break;
! 588:
! 589: default:
! 590: packet_disconnect("Protocol error on Kerberos v5 response: %d",
! 591: type);
! 592: ret = 0;
! 593: break;
! 594:
! 595: }
! 596:
! 597: out:
! 598: if (ccache != NULL)
! 599: krb5_cc_close(*context, ccache);
! 600: if (reply != NULL)
! 601: krb5_free_ap_rep_enc_part(*context, reply);
! 602: if (ap.length > 0)
! 603: krb5_data_free(&ap);
! 604:
! 605: return (ret);
! 606: }
! 607:
! 608: static void
! 609: send_krb5_tgt(krb5_context context, krb5_auth_context auth_context)
! 610: {
! 611: int fd, type, payload_len;
! 612: krb5_error_code problem;
! 613: krb5_data outbuf;
! 614: krb5_ccache ccache = NULL;
! 615: krb5_creds creds;
! 616: krb5_kdc_flags flags;
! 617: const char *remotehost;
! 618:
! 619: memset(&creds, 0, sizeof(creds));
! 620: memset(&outbuf, 0, sizeof(outbuf));
! 621:
! 622: fd = packet_get_connection_in();
! 623:
! 624: problem = krb5_auth_con_setaddrs_from_fd(context, auth_context, &fd);
! 625: if (problem)
! 626: goto out;
! 627:
! 628: problem = krb5_cc_default(context, &ccache);
! 629: if (problem)
! 630: goto out;
! 631:
! 632: problem = krb5_cc_get_principal(context, ccache, &creds.client);
! 633: if (problem)
! 634: goto out;
! 635:
! 636: problem = krb5_build_principal(context, &creds.server,
! 637: strlen(creds.client->realm), creds.client->realm,
! 638: "krbtgt", creds.client->realm, NULL);
! 639: if (problem)
! 640: goto out;
! 641:
! 642: creds.times.endtime = 0;
! 643:
! 644: flags.i = 0;
! 645: flags.b.forwarded = 1;
! 646: flags.b.forwardable = krb5_config_get_bool(context, NULL,
! 647: "libdefaults", "forwardable", NULL);
! 648:
! 649: remotehost = get_canonical_hostname(1);
! 650:
! 651: problem = krb5_get_forwarded_creds(context, auth_context,
! 652: ccache, flags.i, remotehost, &creds, &outbuf);
! 653: if (problem)
! 654: goto out;
! 655:
! 656: packet_start(SSH_CMSG_HAVE_KERBEROS_TGT);
! 657: packet_put_string((char *)outbuf.data, outbuf.length);
! 658: packet_send();
! 659: packet_write_wait();
! 660:
! 661: type = packet_read(&payload_len);
! 662:
! 663: if (type == SSH_SMSG_SUCCESS) {
! 664: char *pname;
! 665:
! 666: krb5_unparse_name(context, creds.client, &pname);
! 667: debug("Kerberos v5 TGT forwarded (%s).", pname);
! 668: xfree(pname);
! 669: } else
! 670: debug("Kerberos v5 TGT forwarding failed.");
! 671:
! 672: return;
! 673:
! 674: out:
! 675: if (problem)
! 676: debug("Kerberos v5 TGT forwarding failed: %s",
! 677: krb5_get_err_text(context, problem));
! 678: if (creds.client)
! 679: krb5_free_principal(context, creds.client);
! 680: if (creds.server)
! 681: krb5_free_principal(context, creds.server);
! 682: if (ccache)
! 683: krb5_cc_close(context, ccache);
! 684: if (outbuf.data)
! 685: xfree(outbuf.data);
! 686: }
! 687: #endif /* KRB5 */
! 688:
1.1 markus 689: #ifdef AFS
1.37 ! dugsong 690: static void
! 691: send_krb4_tgt(void)
1.1 markus 692: {
693: CREDENTIALS *creds;
694: struct stat st;
1.37 ! dugsong 695: char buffer[4096], pname[ANAME_SZ], pinst[INST_SZ], prealm[REALM_SZ];
! 696: int problem, type, len;
! 697:
1.1 markus 698: /* Don't do anything if we don't have any tickets. */
699: if (stat(tkt_string(), &st) < 0)
1.37 ! dugsong 700: return;
! 701:
1.1 markus 702: creds = xmalloc(sizeof(*creds));
1.37 ! dugsong 703:
! 704: problem = krb_get_tf_fullname(TKT_FILE, pname, pinst, prealm);
! 705: if (problem)
! 706: goto out;
! 707:
! 708: problem = krb_get_cred("krbtgt", prealm, prealm, creds);
! 709: if (problem)
! 710: goto out;
! 711:
1.1 markus 712: if (time(0) > krb_life_to_time(creds->issue_date, creds->lifetime)) {
1.37 ! dugsong 713: problem = RD_AP_EXP;
! 714: goto out;
1.1 markus 715: }
1.37 ! dugsong 716: creds_to_radix(creds, (u_char *)buffer, sizeof(buffer));
! 717:
1.1 markus 718: packet_start(SSH_CMSG_HAVE_KERBEROS_TGT);
1.33 markus 719: packet_put_cstring(buffer);
1.1 markus 720: packet_send();
721: packet_write_wait();
1.37 ! dugsong 722:
! 723: type = packet_read(&len);
! 724:
! 725: if (type == SSH_SMSG_SUCCESS)
! 726: debug("Kerberos v4 TGT forwarded (%s%s%s@%s).",
! 727: creds->pname, creds->pinst[0] ? "." : "",
! 728: creds->pinst, creds->realm);
! 729: else
! 730: debug("Kerberos v4 TGT rejected.");
! 731:
! 732: xfree(creds);
! 733: return;
! 734:
! 735: out:
! 736: debug("Kerberos v4 TGT passing failed: %s", krb_err_txt[problem]);
! 737: xfree(creds);
1.1 markus 738: }
739:
1.35 itojun 740: static void
1.1 markus 741: send_afs_tokens(void)
742: {
743: CREDENTIALS creds;
744: struct ViceIoctl parms;
745: struct ClearToken ct;
1.37 ! dugsong 746: int i, type, len;
1.1 markus 747: char buf[2048], *p, *server_cell;
748: char buffer[8192];
1.37 ! dugsong 749:
1.1 markus 750: /* Move over ktc_GetToken, here's something leaner. */
751: for (i = 0; i < 100; i++) { /* just in case */
752: parms.in = (char *) &i;
753: parms.in_size = sizeof(i);
754: parms.out = buf;
755: parms.out_size = sizeof(buf);
756: if (k_pioctl(0, VIOCGETTOK, &parms, 0) != 0)
757: break;
758: p = buf;
1.37 ! dugsong 759:
1.1 markus 760: /* Get secret token. */
1.13 markus 761: memcpy(&creds.ticket_st.length, p, sizeof(u_int));
1.1 markus 762: if (creds.ticket_st.length > MAX_KTXT_LEN)
763: break;
1.13 markus 764: p += sizeof(u_int);
1.1 markus 765: memcpy(creds.ticket_st.dat, p, creds.ticket_st.length);
766: p += creds.ticket_st.length;
1.37 ! dugsong 767:
1.1 markus 768: /* Get clear token. */
769: memcpy(&len, p, sizeof(len));
770: if (len != sizeof(struct ClearToken))
771: break;
772: p += sizeof(len);
773: memcpy(&ct, p, len);
774: p += len;
775: p += sizeof(len); /* primary flag */
776: server_cell = p;
1.37 ! dugsong 777:
1.1 markus 778: /* Flesh out our credentials. */
1.37 ! dugsong 779: strlcpy(creds.service, "afs", sizeof(creds.service));
1.1 markus 780: creds.instance[0] = '\0';
781: strlcpy(creds.realm, server_cell, REALM_SZ);
782: memcpy(creds.session, ct.HandShakeKey, DES_KEY_SZ);
783: creds.issue_date = ct.BeginTimestamp;
1.37 ! dugsong 784: creds.lifetime = krb_time_to_life(creds.issue_date,
! 785: ct.EndTimestamp);
1.1 markus 786: creds.kvno = ct.AuthHandle;
787: snprintf(creds.pname, sizeof(creds.pname), "AFS ID %d", ct.ViceId);
788: creds.pinst[0] = '\0';
1.37 ! dugsong 789:
1.1 markus 790: /* Encode token, ship it off. */
1.37 ! dugsong 791: if (creds_to_radix(&creds, (u_char *)buffer,
! 792: sizeof(buffer)) <= 0)
1.1 markus 793: break;
794: packet_start(SSH_CMSG_HAVE_AFS_TOKEN);
1.33 markus 795: packet_put_cstring(buffer);
1.1 markus 796: packet_send();
797: packet_write_wait();
798:
799: /* Roger, Roger. Clearance, Clarence. What's your vector,
800: Victor? */
1.37 ! dugsong 801: type = packet_read(&len);
! 802:
1.1 markus 803: if (type == SSH_SMSG_FAILURE)
804: debug("AFS token for cell %s rejected.", server_cell);
805: else if (type != SSH_SMSG_SUCCESS)
806: packet_disconnect("Protocol error on AFS token response: %d", type);
807: }
808: }
809:
810: #endif /* AFS */
811:
812: /*
813: * Tries to authenticate with any string-based challenge/response system.
814: * Note that the client code is not tied to s/key or TIS.
815: */
1.35 itojun 816: static int
1.32 markus 817: try_challenge_response_authentication(void)
1.1 markus 818: {
819: int type, i;
820: int payload_len;
1.13 markus 821: u_int clen;
1.12 markus 822: char prompt[1024];
1.1 markus 823: char *challenge, *response;
1.37 ! dugsong 824:
1.20 markus 825: debug("Doing challenge reponse authentication.");
1.37 ! dugsong 826:
1.12 markus 827: for (i = 0; i < options.number_of_password_prompts; i++) {
828: /* request a challenge */
829: packet_start(SSH_CMSG_AUTH_TIS);
830: packet_send();
831: packet_write_wait();
1.1 markus 832:
1.12 markus 833: type = packet_read(&payload_len);
834: if (type != SSH_SMSG_FAILURE &&
835: type != SSH_SMSG_AUTH_TIS_CHALLENGE) {
836: packet_disconnect("Protocol error: got %d in response "
1.20 markus 837: "to SSH_CMSG_AUTH_TIS", type);
1.12 markus 838: }
839: if (type != SSH_SMSG_AUTH_TIS_CHALLENGE) {
1.20 markus 840: debug("No challenge.");
1.12 markus 841: return 0;
842: }
843: challenge = packet_get_string(&clen);
844: packet_integrity_check(payload_len, (4 + clen), type);
1.16 markus 845: snprintf(prompt, sizeof prompt, "%s%s", challenge,
846: strchr(challenge, '\n') ? "" : "\nResponse: ");
1.12 markus 847: xfree(challenge);
1.1 markus 848: if (i != 0)
849: error("Permission denied, please try again.");
1.12 markus 850: if (options.cipher == SSH_CIPHER_NONE)
851: log("WARNING: Encryption is disabled! "
852: "Reponse will be transmitted in clear text.");
853: response = read_passphrase(prompt, 0);
854: if (strcmp(response, "") == 0) {
855: xfree(response);
856: break;
857: }
1.1 markus 858: packet_start(SSH_CMSG_AUTH_TIS_RESPONSE);
1.27 markus 859: ssh_put_password(response);
1.1 markus 860: memset(response, 0, strlen(response));
861: xfree(response);
862: packet_send();
863: packet_write_wait();
864: type = packet_read(&payload_len);
865: if (type == SSH_SMSG_SUCCESS)
866: return 1;
867: if (type != SSH_SMSG_FAILURE)
868: packet_disconnect("Protocol error: got %d in response "
1.20 markus 869: "to SSH_CMSG_AUTH_TIS_RESPONSE", type);
1.1 markus 870: }
871: /* failure */
872: return 0;
873: }
874:
875: /*
876: * Tries to authenticate with plain passwd authentication.
877: */
1.35 itojun 878: static int
1.1 markus 879: try_password_authentication(char *prompt)
880: {
881: int type, i, payload_len;
882: char *password;
883:
884: debug("Doing password authentication.");
885: if (options.cipher == SSH_CIPHER_NONE)
886: log("WARNING: Encryption is disabled! Password will be transmitted in clear text.");
887: for (i = 0; i < options.number_of_password_prompts; i++) {
888: if (i != 0)
889: error("Permission denied, please try again.");
890: password = read_passphrase(prompt, 0);
891: packet_start(SSH_CMSG_AUTH_PASSWORD);
1.27 markus 892: ssh_put_password(password);
1.1 markus 893: memset(password, 0, strlen(password));
894: xfree(password);
895: packet_send();
896: packet_write_wait();
897:
898: type = packet_read(&payload_len);
899: if (type == SSH_SMSG_SUCCESS)
900: return 1;
901: if (type != SSH_SMSG_FAILURE)
902: packet_disconnect("Protocol error: got %d in response to passwd auth", type);
903: }
904: /* failure */
905: return 0;
906: }
907:
908: /*
909: * SSH1 key exchange
910: */
911: void
912: ssh_kex(char *host, struct sockaddr *hostaddr)
913: {
914: int i;
915: BIGNUM *key;
916: RSA *host_key;
917: RSA *public_key;
918: Key k;
919: int bits, rbits;
920: int ssh_cipher_default = SSH_CIPHER_3DES;
1.13 markus 921: u_char session_key[SSH_SESSION_KEY_LENGTH];
922: u_char cookie[8];
923: u_int supported_ciphers;
924: u_int server_flags, client_flags;
1.1 markus 925: int payload_len, clen, sum_len = 0;
926: u_int32_t rand = 0;
927:
928: debug("Waiting for server public key.");
929:
930: /* Wait for a public key packet from the server. */
931: packet_read_expect(&payload_len, SSH_SMSG_PUBLIC_KEY);
932:
933: /* Get cookie from the packet. */
934: for (i = 0; i < 8; i++)
935: cookie[i] = packet_get_char();
936:
937: /* Get the public key. */
938: public_key = RSA_new();
939: bits = packet_get_int();/* bits */
940: public_key->e = BN_new();
941: packet_get_bignum(public_key->e, &clen);
942: sum_len += clen;
943: public_key->n = BN_new();
944: packet_get_bignum(public_key->n, &clen);
945: sum_len += clen;
946:
947: rbits = BN_num_bits(public_key->n);
948: if (bits != rbits) {
949: log("Warning: Server lies about size of server public key: "
950: "actual size is %d bits vs. announced %d.", rbits, bits);
951: log("Warning: This may be due to an old implementation of ssh.");
952: }
953: /* Get the host key. */
954: host_key = RSA_new();
955: bits = packet_get_int();/* bits */
956: host_key->e = BN_new();
957: packet_get_bignum(host_key->e, &clen);
958: sum_len += clen;
959: host_key->n = BN_new();
960: packet_get_bignum(host_key->n, &clen);
961: sum_len += clen;
962:
963: rbits = BN_num_bits(host_key->n);
964: if (bits != rbits) {
965: log("Warning: Server lies about size of server host key: "
966: "actual size is %d bits vs. announced %d.", rbits, bits);
967: log("Warning: This may be due to an old implementation of ssh.");
968: }
969:
970: /* Get protocol flags. */
971: server_flags = packet_get_int();
972: packet_set_protocol_flags(server_flags);
973:
974: supported_ciphers = packet_get_int();
975: supported_authentications = packet_get_int();
976:
977: debug("Received server public key (%d bits) and host key (%d bits).",
978: BN_num_bits(public_key->n), BN_num_bits(host_key->n));
979:
980: packet_integrity_check(payload_len,
981: 8 + 4 + sum_len + 0 + 4 + 0 + 0 + 4 + 4 + 4,
982: SSH_SMSG_PUBLIC_KEY);
1.9 markus 983: k.type = KEY_RSA1;
1.1 markus 984: k.rsa = host_key;
1.34 markus 985: if (verify_host_key(host, hostaddr, &k) == -1)
986: fatal("host_key verification failed");
1.1 markus 987:
988: client_flags = SSH_PROTOFLAG_SCREEN_NUMBER | SSH_PROTOFLAG_HOST_IN_FWD_OPEN;
989:
990: compute_session_id(session_id, cookie, host_key->n, public_key->n);
991:
992: /* Generate a session key. */
993: arc4random_stir();
994:
995: /*
996: * Generate an encryption key for the session. The key is a 256 bit
997: * random number, interpreted as a 32-byte key, with the least
998: * significant 8 bits being the first byte of the key.
999: */
1000: for (i = 0; i < 32; i++) {
1001: if (i % 4 == 0)
1002: rand = arc4random();
1003: session_key[i] = rand & 0xff;
1004: rand >>= 8;
1005: }
1006:
1007: /*
1008: * According to the protocol spec, the first byte of the session key
1009: * is the highest byte of the integer. The session key is xored with
1010: * the first 16 bytes of the session id.
1011: */
1012: key = BN_new();
1013: BN_set_word(key, 0);
1014: for (i = 0; i < SSH_SESSION_KEY_LENGTH; i++) {
1015: BN_lshift(key, key, 8);
1016: if (i < 16)
1017: BN_add_word(key, session_key[i] ^ session_id[i]);
1018: else
1019: BN_add_word(key, session_key[i]);
1020: }
1021:
1022: /*
1023: * Encrypt the integer using the public key and host key of the
1024: * server (key with smaller modulus first).
1025: */
1026: if (BN_cmp(public_key->n, host_key->n) < 0) {
1027: /* Public key has smaller modulus. */
1028: if (BN_num_bits(host_key->n) <
1029: BN_num_bits(public_key->n) + SSH_KEY_BITS_RESERVED) {
1030: fatal("respond_to_rsa_challenge: host_key %d < public_key %d + "
1031: "SSH_KEY_BITS_RESERVED %d",
1032: BN_num_bits(host_key->n),
1033: BN_num_bits(public_key->n),
1034: SSH_KEY_BITS_RESERVED);
1035: }
1036: rsa_public_encrypt(key, key, public_key);
1037: rsa_public_encrypt(key, key, host_key);
1038: } else {
1039: /* Host key has smaller modulus (or they are equal). */
1040: if (BN_num_bits(public_key->n) <
1041: BN_num_bits(host_key->n) + SSH_KEY_BITS_RESERVED) {
1042: fatal("respond_to_rsa_challenge: public_key %d < host_key %d + "
1043: "SSH_KEY_BITS_RESERVED %d",
1044: BN_num_bits(public_key->n),
1045: BN_num_bits(host_key->n),
1046: SSH_KEY_BITS_RESERVED);
1047: }
1048: rsa_public_encrypt(key, key, host_key);
1049: rsa_public_encrypt(key, key, public_key);
1050: }
1051:
1052: /* Destroy the public keys since we no longer need them. */
1053: RSA_free(public_key);
1054: RSA_free(host_key);
1055:
1.11 markus 1056: if (options.cipher == SSH_CIPHER_NOT_SET) {
1057: if (cipher_mask_ssh1(1) & supported_ciphers & (1 << ssh_cipher_default))
1058: options.cipher = ssh_cipher_default;
1059: } else if (options.cipher == SSH_CIPHER_ILLEGAL ||
1.10 markus 1060: !(cipher_mask_ssh1(1) & (1 << options.cipher))) {
1.3 markus 1061: log("No valid SSH1 cipher, using %.100s instead.",
1.7 markus 1062: cipher_name(ssh_cipher_default));
1063: options.cipher = ssh_cipher_default;
1.1 markus 1064: }
1065: /* Check that the selected cipher is supported. */
1066: if (!(supported_ciphers & (1 << options.cipher)))
1067: fatal("Selected cipher type %.100s not supported by server.",
1068: cipher_name(options.cipher));
1069:
1070: debug("Encryption type: %.100s", cipher_name(options.cipher));
1071:
1072: /* Send the encrypted session key to the server. */
1073: packet_start(SSH_CMSG_SESSION_KEY);
1074: packet_put_char(options.cipher);
1075:
1076: /* Send the cookie back to the server. */
1077: for (i = 0; i < 8; i++)
1078: packet_put_char(cookie[i]);
1079:
1080: /* Send and destroy the encrypted encryption key integer. */
1081: packet_put_bignum(key);
1082: BN_clear_free(key);
1083:
1084: /* Send protocol flags. */
1085: packet_put_int(client_flags);
1086:
1087: /* Send the packet now. */
1088: packet_send();
1089: packet_write_wait();
1090:
1091: debug("Sent encrypted session key.");
1092:
1093: /* Set the encryption key. */
1094: packet_set_encryption_key(session_key, SSH_SESSION_KEY_LENGTH, options.cipher);
1095:
1096: /* We will no longer need the session key here. Destroy any extra copies. */
1097: memset(session_key, 0, sizeof(session_key));
1098:
1099: /*
1100: * Expect a success message from the server. Note that this message
1101: * will be received in encrypted form.
1102: */
1103: packet_read_expect(&payload_len, SSH_SMSG_SUCCESS);
1104:
1105: debug("Received encrypted confirmation.");
1106: }
1107:
1108: /*
1109: * Authenticate user
1110: */
1111: void
1.30 markus 1112: ssh_userauth1(const char *local_user, const char *server_user, char *host,
1113: Key **keys, int nkeys)
1.1 markus 1114: {
1.37 ! dugsong 1115: #ifdef KRB5
! 1116: krb5_context context = NULL;
! 1117: krb5_auth_context auth_context = NULL;
! 1118: #endif
1.1 markus 1119: int i, type;
1120: int payload_len;
1.37 ! dugsong 1121:
1.1 markus 1122: if (supported_authentications == 0)
1.30 markus 1123: fatal("ssh_userauth1: server supports no auth methods");
1.1 markus 1124:
1125: /* Send the name of the user to log in as on the server. */
1126: packet_start(SSH_CMSG_USER);
1.33 markus 1127: packet_put_cstring(server_user);
1.1 markus 1128: packet_send();
1129: packet_write_wait();
1130:
1131: /*
1132: * The server should respond with success if no authentication is
1133: * needed (the user has no password). Otherwise the server responds
1134: * with failure.
1135: */
1136: type = packet_read(&payload_len);
1137:
1138: /* check whether the connection was accepted without authentication. */
1139: if (type == SSH_SMSG_SUCCESS)
1.37 ! dugsong 1140: goto success;
1.1 markus 1141: if (type != SSH_SMSG_FAILURE)
1.37 ! dugsong 1142: packet_disconnect("Protocol error: got %d in response to SSH_CMSG_USER", type);
! 1143:
! 1144: #ifdef KRB5
! 1145: if ((supported_authentications & (1 << SSH_AUTH_KERBEROS)) &&
! 1146: options.kerberos_authentication) {
! 1147: debug("Trying Kerberos v5 authentication.");
! 1148:
! 1149: if (try_krb5_authentication(&context, &auth_context)) {
! 1150: type = packet_read(&payload_len);
! 1151: if (type == SSH_SMSG_SUCCESS)
! 1152: goto success;
! 1153: if (type != SSH_SMSG_FAILURE)
! 1154: packet_disconnect("Protocol error: got %d in response to Kerberos v5 auth", type);
! 1155: }
1.1 markus 1156: }
1.37 ! dugsong 1157: #endif /* KRB5 */
! 1158:
1.1 markus 1159: #ifdef KRB4
1160: if ((supported_authentications & (1 << SSH_AUTH_KERBEROS)) &&
1161: options.kerberos_authentication) {
1.37 ! dugsong 1162: debug("Trying Kerberos v4 authentication.");
! 1163:
! 1164: if (try_krb4_authentication()) {
1.1 markus 1165: type = packet_read(&payload_len);
1166: if (type == SSH_SMSG_SUCCESS)
1.37 ! dugsong 1167: goto success;
1.1 markus 1168: if (type != SSH_SMSG_FAILURE)
1.37 ! dugsong 1169: packet_disconnect("Protocol error: got %d in response to Kerberos v4 auth", type);
1.1 markus 1170: }
1171: }
1172: #endif /* KRB4 */
1.37 ! dugsong 1173:
1.1 markus 1174: /*
1175: * Use rhosts authentication if running in privileged socket and we
1176: * do not wish to remain anonymous.
1177: */
1178: if ((supported_authentications & (1 << SSH_AUTH_RHOSTS)) &&
1179: options.rhosts_authentication) {
1180: debug("Trying rhosts authentication.");
1181: packet_start(SSH_CMSG_AUTH_RHOSTS);
1.33 markus 1182: packet_put_cstring(local_user);
1.1 markus 1183: packet_send();
1184: packet_write_wait();
1185:
1186: /* The server should respond with success or failure. */
1187: type = packet_read(&payload_len);
1188: if (type == SSH_SMSG_SUCCESS)
1.37 ! dugsong 1189: goto success;
1.1 markus 1190: if (type != SSH_SMSG_FAILURE)
1191: packet_disconnect("Protocol error: got %d in response to rhosts auth",
1192: type);
1193: }
1194: /*
1195: * Try .rhosts or /etc/hosts.equiv authentication with RSA host
1196: * authentication.
1197: */
1198: if ((supported_authentications & (1 << SSH_AUTH_RHOSTS_RSA)) &&
1.30 markus 1199: options.rhosts_rsa_authentication) {
1200: for (i = 0; i < nkeys; i++) {
1.31 markus 1201: if (keys[i] != NULL && keys[i]->type == KEY_RSA1 &&
1.30 markus 1202: try_rhosts_rsa_authentication(local_user, keys[i]))
1.37 ! dugsong 1203: goto success;
1.30 markus 1204: }
1.1 markus 1205: }
1206: /* Try RSA authentication if the server supports it. */
1207: if ((supported_authentications & (1 << SSH_AUTH_RSA)) &&
1208: options.rsa_authentication) {
1209: /*
1210: * Try RSA authentication using the authentication agent. The
1211: * agent is tried first because no passphrase is needed for
1212: * it, whereas identity files may require passphrases.
1213: */
1214: if (try_agent_authentication())
1.37 ! dugsong 1215: goto success;
1.1 markus 1216:
1217: /* Try RSA authentication for each identity. */
1218: for (i = 0; i < options.num_identity_files; i++)
1.28 markus 1219: if (options.identity_keys[i] != NULL &&
1220: options.identity_keys[i]->type == KEY_RSA1 &&
1.9 markus 1221: try_rsa_authentication(options.identity_files[i]))
1.37 ! dugsong 1222: goto success;
1.1 markus 1223: }
1.20 markus 1224: /* Try challenge response authentication if the server supports it. */
1.1 markus 1225: if ((supported_authentications & (1 << SSH_AUTH_TIS)) &&
1.32 markus 1226: options.challenge_response_authentication && !options.batch_mode) {
1227: if (try_challenge_response_authentication())
1.37 ! dugsong 1228: goto success;
1.1 markus 1229: }
1230: /* Try password authentication if the server supports it. */
1231: if ((supported_authentications & (1 << SSH_AUTH_PASSWORD)) &&
1232: options.password_authentication && !options.batch_mode) {
1233: char prompt[80];
1234:
1.23 itojun 1235: snprintf(prompt, sizeof(prompt), "%.30s@%.128s's password: ",
1.1 markus 1236: server_user, host);
1237: if (try_password_authentication(prompt))
1.37 ! dugsong 1238: goto success;
1.1 markus 1239: }
1240: /* All authentication methods have failed. Exit with an error message. */
1241: fatal("Permission denied.");
1242: /* NOTREACHED */
1.37 ! dugsong 1243:
! 1244: success:
! 1245: #ifdef KRB5
! 1246: /* Try Kerberos v5 TGT passing. */
! 1247: if ((supported_authentications & (1 << SSH_PASS_KERBEROS_TGT)) &&
! 1248: options.kerberos_tgt_passing && context && auth_context) {
! 1249: if (options.cipher == SSH_CIPHER_NONE)
! 1250: log("WARNING: Encryption is disabled! Ticket will be transmitted in the clear!");
! 1251: send_krb5_tgt(context, auth_context);
! 1252: }
! 1253: if (auth_context)
! 1254: krb5_auth_con_free(context, auth_context);
! 1255: if (context)
! 1256: krb5_free_context(context);
! 1257: #endif
! 1258:
! 1259: #ifdef AFS
! 1260: /* Try Kerberos v4 TGT passing if the server supports it. */
! 1261: if ((supported_authentications & (1 << SSH_PASS_KERBEROS_TGT)) &&
! 1262: options.kerberos_tgt_passing) {
! 1263: if (options.cipher == SSH_CIPHER_NONE)
! 1264: log("WARNING: Encryption is disabled! Ticket will be transmitted in the clear!");
! 1265: send_krb4_tgt();
! 1266: }
! 1267: /* Try AFS token passing if the server supports it. */
! 1268: if ((supported_authentications & (1 << SSH_PASS_AFS_TOKEN)) &&
! 1269: options.afs_token_passing && k_hasafs()) {
! 1270: if (options.cipher == SSH_CIPHER_NONE)
! 1271: log("WARNING: Encryption is disabled! Token will be transmitted in the clear!");
! 1272: send_afs_tokens();
! 1273: }
! 1274: #endif /* AFS */
1.1 markus 1275: }
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