Annotation of src/usr.bin/ssh/sshconnect2.c, Revision 1.115
1.1 markus 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.
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"
1.115 ! markus 26: RCSID("$OpenBSD: sshconnect2.c,v 1.114 2003/04/01 10:22:21 markus Exp $");
1.1 markus 27:
28: #include "ssh.h"
1.37 markus 29: #include "ssh2.h"
1.1 markus 30: #include "xmalloc.h"
31: #include "buffer.h"
32: #include "packet.h"
33: #include "compat.h"
34: #include "bufaux.h"
1.37 markus 35: #include "cipher.h"
1.1 markus 36: #include "kex.h"
37: #include "myproposal.h"
38: #include "sshconnect.h"
39: #include "authfile.h"
1.57 provos 40: #include "dh.h"
1.17 markus 41: #include "authfd.h"
1.37 markus 42: #include "log.h"
43: #include "readconf.h"
44: #include "readpass.h"
1.53 markus 45: #include "match.h"
1.61 markus 46: #include "dispatch.h"
1.68 markus 47: #include "canohost.h"
1.100 markus 48: #include "msg.h"
49: #include "pathnames.h"
1.22 provos 50:
1.1 markus 51: /* import */
52: extern char *client_version_string;
53: extern char *server_version_string;
54: extern Options options;
55:
56: /*
57: * SSH2 key exchange
58: */
59:
1.32 markus 60: u_char *session_id2 = NULL;
1.1 markus 61: int session_id2_len = 0;
62:
1.61 markus 63: char *xxx_host;
64: struct sockaddr *xxx_hostaddr;
65:
1.63 markus 66: Kex *xxx_kex = NULL;
67:
1.76 itojun 68: static int
1.75 markus 69: verify_host_key_callback(Key *hostkey)
1.61 markus 70: {
1.75 markus 71: if (verify_host_key(xxx_host, xxx_hostaddr, hostkey) == -1)
1.83 markus 72: fatal("Host key verification failed.");
1.61 markus 73: return 0;
74: }
75:
1.1 markus 76: void
1.22 provos 77: ssh_kex2(char *host, struct sockaddr *hostaddr)
78: {
79: Kex *kex;
1.61 markus 80:
81: xxx_host = host;
82: xxx_hostaddr = hostaddr;
1.22 provos 83:
1.29 markus 84: if (options.ciphers == (char *)-1) {
85: log("No valid ciphers for protocol version 2 given, using defaults.");
86: options.ciphers = NULL;
1.24 markus 87: }
1.22 provos 88: if (options.ciphers != NULL) {
89: myproposal[PROPOSAL_ENC_ALGS_CTOS] =
90: myproposal[PROPOSAL_ENC_ALGS_STOC] = options.ciphers;
91: }
1.60 stevesk 92: myproposal[PROPOSAL_ENC_ALGS_CTOS] =
93: compat_cipher_proposal(myproposal[PROPOSAL_ENC_ALGS_CTOS]);
94: myproposal[PROPOSAL_ENC_ALGS_STOC] =
95: compat_cipher_proposal(myproposal[PROPOSAL_ENC_ALGS_STOC]);
1.22 provos 96: if (options.compression) {
1.47 markus 97: myproposal[PROPOSAL_COMP_ALGS_CTOS] =
1.107 markus 98: myproposal[PROPOSAL_COMP_ALGS_STOC] = "zlib,none";
1.22 provos 99: } else {
1.47 markus 100: myproposal[PROPOSAL_COMP_ALGS_CTOS] =
1.107 markus 101: myproposal[PROPOSAL_COMP_ALGS_STOC] = "none,zlib";
1.47 markus 102: }
103: if (options.macs != NULL) {
104: myproposal[PROPOSAL_MAC_ALGS_CTOS] =
105: myproposal[PROPOSAL_MAC_ALGS_STOC] = options.macs;
1.22 provos 106: }
1.70 markus 107: if (options.hostkeyalgorithms != NULL)
1.88 deraadt 108: myproposal[PROPOSAL_SERVER_HOST_KEY_ALGS] =
1.70 markus 109: options.hostkeyalgorithms;
1.115 ! markus 110:
! 111: if (options.rekey_limit)
! 112: packet_set_rekey_limit(options.rekey_limit);
1.22 provos 113:
1.65 markus 114: /* start key exchange */
1.64 markus 115: kex = kex_setup(myproposal);
1.111 markus 116: kex->kex[KEX_DH_GRP1_SHA1] = kexdh_client;
117: kex->kex[KEX_DH_GEX_SHA1] = kexgex_client;
1.61 markus 118: kex->client_version_string=client_version_string;
119: kex->server_version_string=server_version_string;
1.75 markus 120: kex->verify_host_key=&verify_host_key_callback;
1.63 markus 121:
122: xxx_kex = kex;
1.22 provos 123:
1.66 markus 124: dispatch_run(DISPATCH_BLOCK, &kex->done, kex);
1.62 markus 125:
126: session_id2 = kex->session_id;
127: session_id2_len = kex->session_id_len;
1.22 provos 128:
129: #ifdef DEBUG_KEXDH
130: /* send 1st encrypted/maced/compressed message */
131: packet_start(SSH2_MSG_IGNORE);
132: packet_put_cstring("markus");
133: packet_send();
134: packet_write_wait();
135: #endif
1.1 markus 136: }
1.11 markus 137:
1.1 markus 138: /*
139: * Authenticate user
140: */
1.20 markus 141:
142: typedef struct Authctxt Authctxt;
143: typedef struct Authmethod Authmethod;
144:
145: typedef int sign_cb_fn(
146: Authctxt *authctxt, Key *key,
1.96 markus 147: u_char **sigp, u_int *lenp, u_char *data, u_int datalen);
1.20 markus 148:
149: struct Authctxt {
150: const char *server_user;
1.68 markus 151: const char *local_user;
1.20 markus 152: const char *host;
153: const char *service;
1.23 markus 154: Authmethod *method;
1.20 markus 155: int success;
1.51 markus 156: char *authlist;
1.68 markus 157: /* pubkey */
1.51 markus 158: Key *last_key;
159: sign_cb_fn *last_key_sign;
160: int last_key_hint;
1.68 markus 161: AuthenticationConnection *agent;
162: /* hostbased */
1.100 markus 163: Sensitive *sensitive;
1.82 markus 164: /* kbd-interactive */
165: int info_req_seen;
1.20 markus 166: };
167: struct Authmethod {
168: char *name; /* string to compare against server's list */
169: int (*userauth)(Authctxt *authctxt);
170: int *enabled; /* flag in option struct that enables method */
171: int *batch_flag; /* flag in option struct that disables method */
172: };
173:
1.92 markus 174: void input_userauth_success(int, u_int32_t, void *);
175: void input_userauth_failure(int, u_int32_t, void *);
176: void input_userauth_banner(int, u_int32_t, void *);
177: void input_userauth_error(int, u_int32_t, void *);
178: void input_userauth_info_req(int, u_int32_t, void *);
179: void input_userauth_pk_ok(int, u_int32_t, void *);
1.99 markus 180: void input_userauth_passwd_changereq(int, u_int32_t, void *);
1.86 itojun 181:
182: int userauth_none(Authctxt *);
183: int userauth_pubkey(Authctxt *);
184: int userauth_passwd(Authctxt *);
185: int userauth_kbdint(Authctxt *);
186: int userauth_hostbased(Authctxt *);
1.20 markus 187:
1.86 itojun 188: void userauth(Authctxt *, char *);
1.51 markus 189:
1.76 itojun 190: static int sign_and_send_pubkey(Authctxt *, Key *, sign_cb_fn *);
191: static void clear_auth_state(Authctxt *);
192:
193: static Authmethod *authmethod_get(char *authlist);
194: static Authmethod *authmethod_lookup(const char *name);
195: static char *authmethods_get(void);
1.20 markus 196:
197: Authmethod authmethods[] = {
1.81 markus 198: {"hostbased",
199: userauth_hostbased,
200: &options.hostbased_authentication,
201: NULL},
1.20 markus 202: {"publickey",
203: userauth_pubkey,
1.28 markus 204: &options.pubkey_authentication,
1.20 markus 205: NULL},
1.81 markus 206: {"keyboard-interactive",
207: userauth_kbdint,
208: &options.kbd_interactive_authentication,
209: &options.batch_mode},
1.20 markus 210: {"password",
211: userauth_passwd,
212: &options.password_authentication,
1.23 markus 213: &options.batch_mode},
214: {"none",
215: userauth_none,
216: NULL,
217: NULL},
1.20 markus 218: {NULL, NULL, NULL, NULL}
219: };
220:
221: void
1.68 markus 222: ssh_userauth2(const char *local_user, const char *server_user, char *host,
1.100 markus 223: Sensitive *sensitive)
1.20 markus 224: {
225: Authctxt authctxt;
226: int type;
1.39 markus 227:
1.73 markus 228: if (options.challenge_response_authentication)
1.39 markus 229: options.kbd_interactive_authentication = 1;
1.20 markus 230:
231: packet_start(SSH2_MSG_SERVICE_REQUEST);
232: packet_put_cstring("ssh-userauth");
233: packet_send();
1.108 markus 234: debug("SSH2_MSG_SERVICE_REQUEST sent");
1.20 markus 235: packet_write_wait();
1.91 markus 236: type = packet_read();
1.108 markus 237: if (type != SSH2_MSG_SERVICE_ACCEPT)
238: fatal("Server denied authentication request: %d", type);
1.20 markus 239: if (packet_remaining() > 0) {
1.91 markus 240: char *reply = packet_get_string(NULL);
1.108 markus 241: debug2("service_accept: %s", reply);
1.20 markus 242: xfree(reply);
243: } else {
1.109 markus 244: debug2("buggy server: service_accept w/o service");
1.20 markus 245: }
1.90 markus 246: packet_check_eom();
1.108 markus 247: debug("SSH2_MSG_SERVICE_ACCEPT received");
1.20 markus 248:
1.53 markus 249: if (options.preferred_authentications == NULL)
250: options.preferred_authentications = authmethods_get();
251:
1.20 markus 252: /* setup authentication context */
1.82 markus 253: memset(&authctxt, 0, sizeof(authctxt));
1.20 markus 254: authctxt.agent = ssh_get_authentication_connection();
255: authctxt.server_user = server_user;
1.68 markus 256: authctxt.local_user = local_user;
1.20 markus 257: authctxt.host = host;
258: authctxt.service = "ssh-connection"; /* service name */
259: authctxt.success = 0;
1.23 markus 260: authctxt.method = authmethod_lookup("none");
1.51 markus 261: authctxt.authlist = NULL;
1.100 markus 262: authctxt.sensitive = sensitive;
1.82 markus 263: authctxt.info_req_seen = 0;
1.23 markus 264: if (authctxt.method == NULL)
265: fatal("ssh_userauth2: internal error: cannot send userauth none request");
1.20 markus 266:
267: /* initial userauth request */
1.23 markus 268: userauth_none(&authctxt);
1.20 markus 269:
1.65 markus 270: dispatch_init(&input_userauth_error);
1.20 markus 271: dispatch_set(SSH2_MSG_USERAUTH_SUCCESS, &input_userauth_success);
272: dispatch_set(SSH2_MSG_USERAUTH_FAILURE, &input_userauth_failure);
1.35 markus 273: dispatch_set(SSH2_MSG_USERAUTH_BANNER, &input_userauth_banner);
1.20 markus 274: dispatch_run(DISPATCH_BLOCK, &authctxt.success, &authctxt); /* loop until success */
275:
276: if (authctxt.agent != NULL)
277: ssh_close_authentication_connection(authctxt.agent);
278:
1.109 markus 279: debug("Authentication succeeded (%s).", authctxt.method->name);
1.20 markus 280: }
281: void
1.51 markus 282: userauth(Authctxt *authctxt, char *authlist)
283: {
284: if (authlist == NULL) {
285: authlist = authctxt->authlist;
286: } else {
287: if (authctxt->authlist)
288: xfree(authctxt->authlist);
289: authctxt->authlist = authlist;
290: }
291: for (;;) {
292: Authmethod *method = authmethod_get(authlist);
293: if (method == NULL)
294: fatal("Permission denied (%s).", authlist);
295: authctxt->method = method;
296: if (method->userauth(authctxt) != 0) {
297: debug2("we sent a %s packet, wait for reply", method->name);
298: break;
299: } else {
300: debug2("we did not send a packet, disable method");
301: method->enabled = NULL;
302: }
303: }
304: }
1.105 deraadt 305:
1.51 markus 306: void
1.92 markus 307: input_userauth_error(int type, u_int32_t seq, void *ctxt)
1.20 markus 308: {
1.35 markus 309: fatal("input_userauth_error: bad message during authentication: "
310: "type %d", type);
311: }
1.105 deraadt 312:
1.35 markus 313: void
1.92 markus 314: input_userauth_banner(int type, u_int32_t seq, void *ctxt)
1.35 markus 315: {
316: char *msg, *lang;
317: debug3("input_userauth_banner");
318: msg = packet_get_string(NULL);
319: lang = packet_get_string(NULL);
320: fprintf(stderr, "%s", msg);
321: xfree(msg);
322: xfree(lang);
1.20 markus 323: }
1.105 deraadt 324:
1.20 markus 325: void
1.92 markus 326: input_userauth_success(int type, u_int32_t seq, void *ctxt)
1.20 markus 327: {
328: Authctxt *authctxt = ctxt;
329: if (authctxt == NULL)
330: fatal("input_userauth_success: no authentication context");
1.51 markus 331: if (authctxt->authlist)
332: xfree(authctxt->authlist);
333: clear_auth_state(authctxt);
1.20 markus 334: authctxt->success = 1; /* break out */
335: }
1.105 deraadt 336:
1.20 markus 337: void
1.92 markus 338: input_userauth_failure(int type, u_int32_t seq, void *ctxt)
1.20 markus 339: {
340: Authctxt *authctxt = ctxt;
341: char *authlist = NULL;
342: int partial;
343:
344: if (authctxt == NULL)
345: fatal("input_userauth_failure: no authentication context");
346:
1.23 markus 347: authlist = packet_get_string(NULL);
1.20 markus 348: partial = packet_get_char();
1.90 markus 349: packet_check_eom();
1.20 markus 350:
351: if (partial != 0)
1.45 markus 352: log("Authenticated with partial success.");
1.109 markus 353: debug("Authentications that can continue: %s", authlist);
1.20 markus 354:
1.51 markus 355: clear_auth_state(authctxt);
356: userauth(authctxt, authlist);
357: }
358: void
1.92 markus 359: input_userauth_pk_ok(int type, u_int32_t seq, void *ctxt)
1.51 markus 360: {
361: Authctxt *authctxt = ctxt;
362: Key *key = NULL;
363: Buffer b;
1.96 markus 364: int pktype, sent = 0;
365: u_int alen, blen;
366: char *pkalg, *fp;
367: u_char *pkblob;
1.51 markus 368:
369: if (authctxt == NULL)
370: fatal("input_userauth_pk_ok: no authentication context");
371: if (datafellows & SSH_BUG_PKOK) {
372: /* this is similar to SSH_BUG_PKAUTH */
373: debug2("input_userauth_pk_ok: SSH_BUG_PKOK");
374: pkblob = packet_get_string(&blen);
375: buffer_init(&b);
376: buffer_append(&b, pkblob, blen);
377: pkalg = buffer_get_string(&b, &alen);
378: buffer_free(&b);
379: } else {
380: pkalg = packet_get_string(&alen);
381: pkblob = packet_get_string(&blen);
382: }
1.90 markus 383: packet_check_eom();
1.51 markus 384:
1.109 markus 385: debug("Server accepts key: pkalg %s blen %u lastkey %p hint %d",
1.51 markus 386: pkalg, blen, authctxt->last_key, authctxt->last_key_hint);
387:
388: do {
389: if (authctxt->last_key == NULL ||
390: authctxt->last_key_sign == NULL) {
391: debug("no last key or no sign cb");
392: break;
393: }
1.95 markus 394: if ((pktype = key_type_from_name(pkalg)) == KEY_UNSPEC) {
1.51 markus 395: debug("unknown pkalg %s", pkalg);
396: break;
397: }
398: if ((key = key_from_blob(pkblob, blen)) == NULL) {
399: debug("no key from blob. pkalg %s", pkalg);
1.95 markus 400: break;
401: }
1.98 markus 402: if (key->type != pktype) {
1.95 markus 403: error("input_userauth_pk_ok: type mismatch "
404: "for decoded key (received %d, expected %d)",
1.104 deraadt 405: key->type, pktype);
1.51 markus 406: break;
407: }
1.54 markus 408: fp = key_fingerprint(key, SSH_FP_MD5, SSH_FP_HEX);
409: debug2("input_userauth_pk_ok: fp %s", fp);
410: xfree(fp);
1.51 markus 411: if (!key_equal(key, authctxt->last_key)) {
412: debug("key != last_key");
1.20 markus 413: break;
414: }
1.51 markus 415: sent = sign_and_send_pubkey(authctxt, key,
416: authctxt->last_key_sign);
1.87 deraadt 417: } while (0);
1.51 markus 418:
419: if (key != NULL)
420: key_free(key);
421: xfree(pkalg);
422: xfree(pkblob);
423:
424: /* unregister */
425: clear_auth_state(authctxt);
426: dispatch_set(SSH2_MSG_USERAUTH_PK_OK, NULL);
427:
1.106 deraadt 428: /* try another method if we did not send a packet */
1.51 markus 429: if (sent == 0)
430: userauth(authctxt, NULL);
431:
1.20 markus 432: }
433:
1.1 markus 434: int
1.23 markus 435: userauth_none(Authctxt *authctxt)
436: {
437: /* initial userauth request */
438: packet_start(SSH2_MSG_USERAUTH_REQUEST);
439: packet_put_cstring(authctxt->server_user);
440: packet_put_cstring(authctxt->service);
441: packet_put_cstring(authctxt->method->name);
442: packet_send();
443: return 1;
444: }
445:
446: int
1.20 markus 447: userauth_passwd(Authctxt *authctxt)
1.1 markus 448: {
1.6 markus 449: static int attempt = 0;
1.99 markus 450: char prompt[150];
1.1 markus 451: char *password;
1.6 markus 452:
1.13 todd 453: if (attempt++ >= options.number_of_password_prompts)
1.6 markus 454: return 0;
1.13 todd 455:
1.87 deraadt 456: if (attempt != 1)
1.13 todd 457: error("Permission denied, please try again.");
1.1 markus 458:
1.43 itojun 459: snprintf(prompt, sizeof(prompt), "%.30s@%.128s's password: ",
1.20 markus 460: authctxt->server_user, authctxt->host);
1.1 markus 461: password = read_passphrase(prompt, 0);
462: packet_start(SSH2_MSG_USERAUTH_REQUEST);
1.20 markus 463: packet_put_cstring(authctxt->server_user);
464: packet_put_cstring(authctxt->service);
1.23 markus 465: packet_put_cstring(authctxt->method->name);
1.1 markus 466: packet_put_char(0);
1.49 markus 467: packet_put_cstring(password);
1.1 markus 468: memset(password, 0, strlen(password));
469: xfree(password);
1.85 markus 470: packet_add_padding(64);
1.1 markus 471: packet_send();
1.99 markus 472:
1.104 deraadt 473: dispatch_set(SSH2_MSG_USERAUTH_PASSWD_CHANGEREQ,
1.99 markus 474: &input_userauth_passwd_changereq);
475:
1.1 markus 476: return 1;
477: }
1.99 markus 478: /*
479: * parse PASSWD_CHANGEREQ, prompt user and send SSH2_MSG_USERAUTH_REQUEST
480: */
481: void
482: input_userauth_passwd_changereq(int type, uint32_t seqnr, void *ctxt)
483: {
484: Authctxt *authctxt = ctxt;
485: char *info, *lang, *password = NULL, *retype = NULL;
486: char prompt[150];
487:
488: debug2("input_userauth_passwd_changereq");
489:
490: if (authctxt == NULL)
491: fatal("input_userauth_passwd_changereq: "
492: "no authentication context");
493:
494: info = packet_get_string(NULL);
495: lang = packet_get_string(NULL);
496: if (strlen(info) > 0)
497: log("%s", info);
498: xfree(info);
499: xfree(lang);
500: packet_start(SSH2_MSG_USERAUTH_REQUEST);
501: packet_put_cstring(authctxt->server_user);
502: packet_put_cstring(authctxt->service);
503: packet_put_cstring(authctxt->method->name);
504: packet_put_char(1); /* additional info */
1.104 deraadt 505: snprintf(prompt, sizeof(prompt),
1.99 markus 506: "Enter %.30s@%.128s's old password: ",
507: authctxt->server_user, authctxt->host);
508: password = read_passphrase(prompt, 0);
509: packet_put_cstring(password);
510: memset(password, 0, strlen(password));
511: xfree(password);
512: password = NULL;
513: while (password == NULL) {
1.104 deraadt 514: snprintf(prompt, sizeof(prompt),
1.99 markus 515: "Enter %.30s@%.128s's new password: ",
516: authctxt->server_user, authctxt->host);
517: password = read_passphrase(prompt, RP_ALLOW_EOF);
518: if (password == NULL) {
519: /* bail out */
520: return;
521: }
1.104 deraadt 522: snprintf(prompt, sizeof(prompt),
1.99 markus 523: "Retype %.30s@%.128s's new password: ",
524: authctxt->server_user, authctxt->host);
525: retype = read_passphrase(prompt, 0);
526: if (strcmp(password, retype) != 0) {
527: memset(password, 0, strlen(password));
528: xfree(password);
529: log("Mismatch; try again, EOF to quit.");
530: password = NULL;
531: }
532: memset(retype, 0, strlen(retype));
533: xfree(retype);
534: }
535: packet_put_cstring(password);
536: memset(password, 0, strlen(password));
537: xfree(password);
538: packet_add_padding(64);
539: packet_send();
1.104 deraadt 540:
541: dispatch_set(SSH2_MSG_USERAUTH_PASSWD_CHANGEREQ,
1.99 markus 542: &input_userauth_passwd_changereq);
543: }
1.1 markus 544:
1.79 stevesk 545: static void
1.51 markus 546: clear_auth_state(Authctxt *authctxt)
547: {
548: /* XXX clear authentication state */
1.99 markus 549: dispatch_set(SSH2_MSG_USERAUTH_PASSWD_CHANGEREQ, NULL);
550:
1.51 markus 551: if (authctxt->last_key != NULL && authctxt->last_key_hint == -1) {
552: debug3("clear_auth_state: key_free %p", authctxt->last_key);
553: key_free(authctxt->last_key);
554: }
555: authctxt->last_key = NULL;
556: authctxt->last_key_hint = -2;
557: authctxt->last_key_sign = NULL;
558: }
559:
1.76 itojun 560: static int
1.20 markus 561: sign_and_send_pubkey(Authctxt *authctxt, Key *k, sign_cb_fn *sign_callback)
1.1 markus 562: {
563: Buffer b;
1.32 markus 564: u_char *blob, *signature;
1.96 markus 565: u_int bloblen, slen;
1.14 markus 566: int skip = 0;
1.17 markus 567: int ret = -1;
1.23 markus 568: int have_sig = 1;
1.1 markus 569:
1.30 markus 570: debug3("sign_and_send_pubkey");
1.51 markus 571:
1.28 markus 572: if (key_to_blob(k, &blob, &bloblen) == 0) {
573: /* we cannot handle this key */
1.30 markus 574: debug3("sign_and_send_pubkey: cannot handle key");
1.28 markus 575: return 0;
576: }
1.1 markus 577: /* data to be signed */
578: buffer_init(&b);
1.26 markus 579: if (datafellows & SSH_OLD_SESSIONID) {
580: buffer_append(&b, session_id2, session_id2_len);
1.41 stevesk 581: skip = session_id2_len;
1.26 markus 582: } else {
1.14 markus 583: buffer_put_string(&b, session_id2, session_id2_len);
584: skip = buffer_len(&b);
585: }
1.1 markus 586: buffer_put_char(&b, SSH2_MSG_USERAUTH_REQUEST);
1.20 markus 587: buffer_put_cstring(&b, authctxt->server_user);
1.10 markus 588: buffer_put_cstring(&b,
1.30 markus 589: datafellows & SSH_BUG_PKSERVICE ?
1.10 markus 590: "ssh-userauth" :
1.20 markus 591: authctxt->service);
1.30 markus 592: if (datafellows & SSH_BUG_PKAUTH) {
593: buffer_put_char(&b, have_sig);
594: } else {
595: buffer_put_cstring(&b, authctxt->method->name);
596: buffer_put_char(&b, have_sig);
1.41 stevesk 597: buffer_put_cstring(&b, key_ssh_name(k));
1.30 markus 598: }
1.1 markus 599: buffer_put_string(&b, blob, bloblen);
600:
601: /* generate signature */
1.51 markus 602: ret = (*sign_callback)(authctxt, k, &signature, &slen,
603: buffer_ptr(&b), buffer_len(&b));
1.17 markus 604: if (ret == -1) {
605: xfree(blob);
606: buffer_free(&b);
607: return 0;
608: }
1.28 markus 609: #ifdef DEBUG_PK
1.1 markus 610: buffer_dump(&b);
611: #endif
1.30 markus 612: if (datafellows & SSH_BUG_PKSERVICE) {
1.10 markus 613: buffer_clear(&b);
614: buffer_append(&b, session_id2, session_id2_len);
1.51 markus 615: skip = session_id2_len;
1.10 markus 616: buffer_put_char(&b, SSH2_MSG_USERAUTH_REQUEST);
1.20 markus 617: buffer_put_cstring(&b, authctxt->server_user);
618: buffer_put_cstring(&b, authctxt->service);
1.23 markus 619: buffer_put_cstring(&b, authctxt->method->name);
620: buffer_put_char(&b, have_sig);
1.30 markus 621: if (!(datafellows & SSH_BUG_PKAUTH))
1.41 stevesk 622: buffer_put_cstring(&b, key_ssh_name(k));
1.10 markus 623: buffer_put_string(&b, blob, bloblen);
624: }
625: xfree(blob);
1.51 markus 626:
1.1 markus 627: /* append signature */
628: buffer_put_string(&b, signature, slen);
629: xfree(signature);
630:
631: /* skip session id and packet type */
1.14 markus 632: if (buffer_len(&b) < skip + 1)
1.20 markus 633: fatal("userauth_pubkey: internal error");
1.14 markus 634: buffer_consume(&b, skip + 1);
1.1 markus 635:
636: /* put remaining data from buffer into packet */
637: packet_start(SSH2_MSG_USERAUTH_REQUEST);
638: packet_put_raw(buffer_ptr(&b), buffer_len(&b));
639: buffer_free(&b);
640: packet_send();
1.17 markus 641:
642: return 1;
1.16 markus 643: }
644:
1.76 itojun 645: static int
1.51 markus 646: send_pubkey_test(Authctxt *authctxt, Key *k, sign_cb_fn *sign_callback,
647: int hint)
1.20 markus 648: {
1.51 markus 649: u_char *blob;
1.97 markus 650: u_int bloblen, have_sig = 0;
1.20 markus 651:
1.51 markus 652: debug3("send_pubkey_test");
1.16 markus 653:
1.51 markus 654: if (key_to_blob(k, &blob, &bloblen) == 0) {
655: /* we cannot handle this key */
656: debug3("send_pubkey_test: cannot handle key");
1.16 markus 657: return 0;
658: }
1.51 markus 659: /* register callback for USERAUTH_PK_OK message */
660: authctxt->last_key_sign = sign_callback;
661: authctxt->last_key_hint = hint;
662: authctxt->last_key = k;
663: dispatch_set(SSH2_MSG_USERAUTH_PK_OK, &input_userauth_pk_ok);
664:
665: packet_start(SSH2_MSG_USERAUTH_REQUEST);
666: packet_put_cstring(authctxt->server_user);
667: packet_put_cstring(authctxt->service);
668: packet_put_cstring(authctxt->method->name);
669: packet_put_char(have_sig);
670: if (!(datafellows & SSH_BUG_PKAUTH))
671: packet_put_cstring(key_ssh_name(k));
672: packet_put_string(blob, bloblen);
673: xfree(blob);
674: packet_send();
675: return 1;
676: }
677:
1.76 itojun 678: static Key *
1.51 markus 679: load_identity_file(char *filename)
680: {
681: Key *private;
682: char prompt[300], *passphrase;
1.56 markus 683: int quit, i;
1.52 markus 684: struct stat st;
1.16 markus 685:
1.52 markus 686: if (stat(filename, &st) < 0) {
687: debug3("no such identity: %s", filename);
688: return NULL;
689: }
1.56 markus 690: private = key_load_private_type(KEY_UNSPEC, filename, "", NULL);
691: if (private == NULL) {
692: if (options.batch_mode)
1.51 markus 693: return NULL;
1.16 markus 694: snprintf(prompt, sizeof prompt,
1.88 deraadt 695: "Enter passphrase for key '%.100s': ", filename);
1.20 markus 696: for (i = 0; i < options.number_of_password_prompts; i++) {
697: passphrase = read_passphrase(prompt, 0);
698: if (strcmp(passphrase, "") != 0) {
1.56 markus 699: private = key_load_private_type(KEY_UNSPEC, filename,
700: passphrase, NULL);
1.51 markus 701: quit = 0;
1.20 markus 702: } else {
703: debug2("no passphrase given, try next key");
1.51 markus 704: quit = 1;
1.20 markus 705: }
706: memset(passphrase, 0, strlen(passphrase));
707: xfree(passphrase);
1.56 markus 708: if (private != NULL || quit)
1.20 markus 709: break;
710: debug2("bad passphrase given, try again...");
1.16 markus 711: }
712: }
1.51 markus 713: return private;
714: }
715:
1.76 itojun 716: static int
1.96 markus 717: identity_sign_cb(Authctxt *authctxt, Key *key, u_char **sigp, u_int *lenp,
718: u_char *data, u_int datalen)
1.51 markus 719: {
720: Key *private;
721: int idx, ret;
722:
723: idx = authctxt->last_key_hint;
724: if (idx < 0)
725: return -1;
1.80 markus 726:
727: /* private key is stored in external hardware */
1.88 deraadt 728: if (options.identity_keys[idx]->flags & KEY_FLAG_EXT)
1.80 markus 729: return key_sign(options.identity_keys[idx], sigp, lenp, data, datalen);
730:
1.51 markus 731: private = load_identity_file(options.identity_files[idx]);
732: if (private == NULL)
733: return -1;
734: ret = key_sign(private, sigp, lenp, data, datalen);
735: key_free(private);
1.17 markus 736: return ret;
737: }
738:
1.76 itojun 739: static int
1.96 markus 740: agent_sign_cb(Authctxt *authctxt, Key *key, u_char **sigp, u_int *lenp,
741: u_char *data, u_int datalen)
1.17 markus 742: {
1.20 markus 743: return ssh_agent_sign(authctxt->agent, key, sigp, lenp, data, datalen);
1.17 markus 744: }
745:
1.76 itojun 746: static int
1.96 markus 747: key_sign_cb(Authctxt *authctxt, Key *key, u_char **sigp, u_int *lenp,
748: u_char *data, u_int datalen)
1.51 markus 749: {
1.67 markus 750: return key_sign(key, sigp, lenp, data, datalen);
1.51 markus 751: }
752:
1.76 itojun 753: static int
1.20 markus 754: userauth_pubkey_agent(Authctxt *authctxt)
1.17 markus 755: {
756: static int called = 0;
1.28 markus 757: int ret = 0;
1.17 markus 758: char *comment;
759: Key *k;
760:
761: if (called == 0) {
1.28 markus 762: if (ssh_get_num_identities(authctxt->agent, 2) == 0)
763: debug2("userauth_pubkey_agent: no keys at all");
1.20 markus 764: called = 1;
1.17 markus 765: }
1.28 markus 766: k = ssh_get_next_identity(authctxt->agent, &comment, 2);
1.20 markus 767: if (k == NULL) {
1.28 markus 768: debug2("userauth_pubkey_agent: no more keys");
769: } else {
1.109 markus 770: debug("Offering agent key: %s", comment);
1.28 markus 771: xfree(comment);
1.51 markus 772: ret = send_pubkey_test(authctxt, k, agent_sign_cb, -1);
773: if (ret == 0)
774: key_free(k);
1.20 markus 775: }
1.28 markus 776: if (ret == 0)
777: debug2("userauth_pubkey_agent: no message sent");
1.17 markus 778: return ret;
1.1 markus 779: }
780:
1.20 markus 781: int
782: userauth_pubkey(Authctxt *authctxt)
783: {
784: static int idx = 0;
785: int sent = 0;
1.51 markus 786: Key *key;
787: char *filename;
1.20 markus 788:
1.28 markus 789: if (authctxt->agent != NULL) {
790: do {
791: sent = userauth_pubkey_agent(authctxt);
1.87 deraadt 792: } while (!sent && authctxt->agent->howmany > 0);
1.28 markus 793: }
794: while (!sent && idx < options.num_identity_files) {
1.51 markus 795: key = options.identity_keys[idx];
796: filename = options.identity_files[idx];
797: if (key == NULL) {
1.109 markus 798: debug("Trying private key: %s", filename);
1.51 markus 799: key = load_identity_file(filename);
800: if (key != NULL) {
801: sent = sign_and_send_pubkey(authctxt, key,
802: key_sign_cb);
803: key_free(key);
804: }
805: } else if (key->type != KEY_RSA1) {
1.109 markus 806: debug("Offering public key: %s", filename);
1.51 markus 807: sent = send_pubkey_test(authctxt, key,
808: identity_sign_cb, idx);
809: }
1.28 markus 810: idx++;
811: }
1.20 markus 812: return sent;
813: }
814:
1.23 markus 815: /*
816: * Send userauth request message specifying keyboard-interactive method.
817: */
818: int
819: userauth_kbdint(Authctxt *authctxt)
820: {
821: static int attempt = 0;
822:
823: if (attempt++ >= options.number_of_password_prompts)
824: return 0;
1.82 markus 825: /* disable if no SSH2_MSG_USERAUTH_INFO_REQUEST has been seen */
826: if (attempt > 1 && !authctxt->info_req_seen) {
827: debug3("userauth_kbdint: disable: no info_req_seen");
828: dispatch_set(SSH2_MSG_USERAUTH_INFO_REQUEST, NULL);
829: return 0;
830: }
1.23 markus 831:
832: debug2("userauth_kbdint");
833: packet_start(SSH2_MSG_USERAUTH_REQUEST);
834: packet_put_cstring(authctxt->server_user);
835: packet_put_cstring(authctxt->service);
836: packet_put_cstring(authctxt->method->name);
837: packet_put_cstring(""); /* lang */
838: packet_put_cstring(options.kbd_interactive_devices ?
839: options.kbd_interactive_devices : "");
840: packet_send();
841:
842: dispatch_set(SSH2_MSG_USERAUTH_INFO_REQUEST, &input_userauth_info_req);
843: return 1;
844: }
845:
846: /*
1.46 markus 847: * parse INFO_REQUEST, prompt user and send INFO_RESPONSE
1.23 markus 848: */
849: void
1.92 markus 850: input_userauth_info_req(int type, u_int32_t seq, void *ctxt)
1.23 markus 851: {
852: Authctxt *authctxt = ctxt;
1.46 markus 853: char *name, *inst, *lang, *prompt, *response;
1.32 markus 854: u_int num_prompts, i;
1.23 markus 855: int echo = 0;
856:
857: debug2("input_userauth_info_req");
858:
859: if (authctxt == NULL)
860: fatal("input_userauth_info_req: no authentication context");
1.82 markus 861:
862: authctxt->info_req_seen = 1;
1.23 markus 863:
864: name = packet_get_string(NULL);
865: inst = packet_get_string(NULL);
866: lang = packet_get_string(NULL);
867: if (strlen(name) > 0)
1.78 markus 868: log("%s", name);
1.23 markus 869: if (strlen(inst) > 0)
1.78 markus 870: log("%s", inst);
1.46 markus 871: xfree(name);
1.23 markus 872: xfree(inst);
1.46 markus 873: xfree(lang);
1.23 markus 874:
875: num_prompts = packet_get_int();
876: /*
877: * Begin to build info response packet based on prompts requested.
878: * We commit to providing the correct number of responses, so if
879: * further on we run into a problem that prevents this, we have to
880: * be sure and clean this up and send a correct error response.
881: */
882: packet_start(SSH2_MSG_USERAUTH_INFO_RESPONSE);
883: packet_put_int(num_prompts);
884:
1.73 markus 885: debug2("input_userauth_info_req: num_prompts %d", num_prompts);
1.23 markus 886: for (i = 0; i < num_prompts; i++) {
887: prompt = packet_get_string(NULL);
888: echo = packet_get_char();
889:
1.77 markus 890: response = read_passphrase(prompt, echo ? RP_ECHO : 0);
1.23 markus 891:
1.49 markus 892: packet_put_cstring(response);
1.23 markus 893: memset(response, 0, strlen(response));
894: xfree(response);
895: xfree(prompt);
896: }
1.90 markus 897: packet_check_eom(); /* done with parsing incoming message. */
1.23 markus 898:
1.85 markus 899: packet_add_padding(64);
1.23 markus 900: packet_send();
1.68 markus 901: }
902:
1.100 markus 903: static int
1.105 deraadt 904: ssh_keysign(Key *key, u_char **sigp, u_int *lenp,
1.100 markus 905: u_char *data, u_int datalen)
906: {
907: Buffer b;
1.101 markus 908: struct stat st;
1.100 markus 909: pid_t pid;
1.103 markus 910: int to[2], from[2], status, version = 2;
1.100 markus 911:
1.109 markus 912: debug2("ssh_keysign called");
1.100 markus 913:
1.101 markus 914: if (stat(_PATH_SSH_KEY_SIGN, &st) < 0) {
915: error("ssh_keysign: no installed: %s", strerror(errno));
916: return -1;
917: }
1.100 markus 918: if (fflush(stdout) != 0)
919: error("ssh_keysign: fflush: %s", strerror(errno));
920: if (pipe(to) < 0) {
921: error("ssh_keysign: pipe: %s", strerror(errno));
922: return -1;
923: }
924: if (pipe(from) < 0) {
925: error("ssh_keysign: pipe: %s", strerror(errno));
926: return -1;
927: }
928: if ((pid = fork()) < 0) {
929: error("ssh_keysign: fork: %s", strerror(errno));
930: return -1;
931: }
932: if (pid == 0) {
933: seteuid(getuid());
934: setuid(getuid());
935: close(from[0]);
936: if (dup2(from[1], STDOUT_FILENO) < 0)
937: fatal("ssh_keysign: dup2: %s", strerror(errno));
938: close(to[1]);
939: if (dup2(to[0], STDIN_FILENO) < 0)
940: fatal("ssh_keysign: dup2: %s", strerror(errno));
1.103 markus 941: close(from[1]);
942: close(to[0]);
1.102 markus 943: execl(_PATH_SSH_KEY_SIGN, _PATH_SSH_KEY_SIGN, (char *) 0);
1.100 markus 944: fatal("ssh_keysign: exec(%s): %s", _PATH_SSH_KEY_SIGN,
945: strerror(errno));
946: }
947: close(from[1]);
948: close(to[0]);
949:
950: buffer_init(&b);
1.103 markus 951: buffer_put_int(&b, packet_get_connection_in()); /* send # of socket */
1.100 markus 952: buffer_put_string(&b, data, datalen);
1.110 djm 953: ssh_msg_send(to[1], version, &b);
1.100 markus 954:
1.110 djm 955: if (ssh_msg_recv(from[0], &b) < 0) {
1.101 markus 956: error("ssh_keysign: no reply");
1.100 markus 957: buffer_clear(&b);
958: return -1;
959: }
1.101 markus 960: close(from[0]);
961: close(to[1]);
962:
1.103 markus 963: while (waitpid(pid, &status, 0) < 0)
964: if (errno != EINTR)
965: break;
1.101 markus 966:
1.100 markus 967: if (buffer_get_char(&b) != version) {
1.101 markus 968: error("ssh_keysign: bad version");
1.100 markus 969: buffer_clear(&b);
970: return -1;
971: }
972: *sigp = buffer_get_string(&b, lenp);
973: buffer_clear(&b);
974:
975: return 0;
976: }
977:
1.68 markus 978: int
979: userauth_hostbased(Authctxt *authctxt)
980: {
981: Key *private = NULL;
1.100 markus 982: Sensitive *sensitive = authctxt->sensitive;
1.68 markus 983: Buffer b;
984: u_char *signature, *blob;
985: char *chost, *pkalg, *p;
1.72 markus 986: const char *service;
1.68 markus 987: u_int blen, slen;
1.71 markus 988: int ok, i, len, found = 0;
1.68 markus 989:
990: /* check for a useful key */
1.100 markus 991: for (i = 0; i < sensitive->nkeys; i++) {
992: private = sensitive->keys[i];
1.68 markus 993: if (private && private->type != KEY_RSA1) {
994: found = 1;
995: /* we take and free the key */
1.100 markus 996: sensitive->keys[i] = NULL;
1.68 markus 997: break;
998: }
999: }
1000: if (!found) {
1.109 markus 1001: debug("No more client hostkeys for hostbased authentication.");
1.68 markus 1002: return 0;
1003: }
1004: if (key_to_blob(private, &blob, &blen) == 0) {
1005: key_free(private);
1006: return 0;
1007: }
1.84 markus 1008: /* figure out a name for the client host */
1009: p = get_local_name(packet_get_connection_in());
1010: if (p == NULL) {
1011: error("userauth_hostbased: cannot get local ipaddr/name");
1012: key_free(private);
1013: return 0;
1014: }
1015: len = strlen(p) + 2;
1016: chost = xmalloc(len);
1017: strlcpy(chost, p, len);
1018: strlcat(chost, ".", len);
1019: debug2("userauth_hostbased: chost %s", chost);
1.112 markus 1020: xfree(p);
1.84 markus 1021:
1.72 markus 1022: service = datafellows & SSH_BUG_HBSERVICE ? "ssh-userauth" :
1023: authctxt->service;
1.68 markus 1024: pkalg = xstrdup(key_ssh_name(private));
1025: buffer_init(&b);
1026: /* construct data */
1.72 markus 1027: buffer_put_string(&b, session_id2, session_id2_len);
1.68 markus 1028: buffer_put_char(&b, SSH2_MSG_USERAUTH_REQUEST);
1029: buffer_put_cstring(&b, authctxt->server_user);
1.72 markus 1030: buffer_put_cstring(&b, service);
1.68 markus 1031: buffer_put_cstring(&b, authctxt->method->name);
1032: buffer_put_cstring(&b, pkalg);
1033: buffer_put_string(&b, blob, blen);
1034: buffer_put_cstring(&b, chost);
1035: buffer_put_cstring(&b, authctxt->local_user);
1036: #ifdef DEBUG_PK
1037: buffer_dump(&b);
1038: #endif
1.100 markus 1039: if (sensitive->external_keysign)
1040: ok = ssh_keysign(private, &signature, &slen,
1041: buffer_ptr(&b), buffer_len(&b));
1042: else
1043: ok = key_sign(private, &signature, &slen,
1044: buffer_ptr(&b), buffer_len(&b));
1.68 markus 1045: key_free(private);
1046: buffer_free(&b);
1047: if (ok != 0) {
1048: error("key_sign failed");
1049: xfree(chost);
1050: xfree(pkalg);
1051: return 0;
1052: }
1053: packet_start(SSH2_MSG_USERAUTH_REQUEST);
1054: packet_put_cstring(authctxt->server_user);
1055: packet_put_cstring(authctxt->service);
1056: packet_put_cstring(authctxt->method->name);
1057: packet_put_cstring(pkalg);
1058: packet_put_string(blob, blen);
1059: packet_put_cstring(chost);
1060: packet_put_cstring(authctxt->local_user);
1061: packet_put_string(signature, slen);
1062: memset(signature, 's', slen);
1063: xfree(signature);
1064: xfree(chost);
1065: xfree(pkalg);
1066:
1067: packet_send();
1068: return 1;
1.23 markus 1069: }
1.20 markus 1070:
1071: /* find auth method */
1072:
1073: /*
1074: * given auth method name, if configurable options permit this method fill
1075: * in auth_ident field and return true, otherwise return false.
1076: */
1.76 itojun 1077: static int
1.20 markus 1078: authmethod_is_enabled(Authmethod *method)
1079: {
1080: if (method == NULL)
1081: return 0;
1082: /* return false if options indicate this method is disabled */
1083: if (method->enabled == NULL || *method->enabled == 0)
1084: return 0;
1085: /* return false if batch mode is enabled but method needs interactive mode */
1086: if (method->batch_flag != NULL && *method->batch_flag != 0)
1087: return 0;
1088: return 1;
1089: }
1090:
1.76 itojun 1091: static Authmethod *
1.20 markus 1092: authmethod_lookup(const char *name)
1.1 markus 1093: {
1.20 markus 1094: Authmethod *method = NULL;
1095: if (name != NULL)
1096: for (method = authmethods; method->name != NULL; method++)
1097: if (strcmp(name, method->name) == 0)
1098: return method;
1099: debug2("Unrecognized authentication method name: %s", name ? name : "NULL");
1100: return NULL;
1101: }
1.1 markus 1102:
1.53 markus 1103: /* XXX internal state */
1104: static Authmethod *current = NULL;
1105: static char *supported = NULL;
1106: static char *preferred = NULL;
1.105 deraadt 1107:
1.20 markus 1108: /*
1109: * Given the authentication method list sent by the server, return the
1110: * next method we should try. If the server initially sends a nil list,
1.67 markus 1111: * use a built-in default list.
1.41 stevesk 1112: */
1.76 itojun 1113: static Authmethod *
1.20 markus 1114: authmethod_get(char *authlist)
1115: {
1.53 markus 1116: char *name = NULL;
1.97 markus 1117: u_int next;
1.41 stevesk 1118:
1.20 markus 1119: /* Use a suitable default if we're passed a nil list. */
1120: if (authlist == NULL || strlen(authlist) == 0)
1.53 markus 1121: authlist = options.preferred_authentications;
1.20 markus 1122:
1.53 markus 1123: if (supported == NULL || strcmp(authlist, supported) != 0) {
1124: debug3("start over, passed a different list %s", authlist);
1125: if (supported != NULL)
1126: xfree(supported);
1127: supported = xstrdup(authlist);
1128: preferred = options.preferred_authentications;
1129: debug3("preferred %s", preferred);
1130: current = NULL;
1131: } else if (current != NULL && authmethod_is_enabled(current))
1132: return current;
1.20 markus 1133:
1.53 markus 1134: for (;;) {
1135: if ((name = match_list(preferred, supported, &next)) == NULL) {
1.109 markus 1136: debug("No more authentication methods to try.");
1.53 markus 1137: current = NULL;
1138: return NULL;
1139: }
1140: preferred += next;
1.23 markus 1141: debug3("authmethod_lookup %s", name);
1.53 markus 1142: debug3("remaining preferred: %s", preferred);
1143: if ((current = authmethod_lookup(name)) != NULL &&
1144: authmethod_is_enabled(current)) {
1.23 markus 1145: debug3("authmethod_is_enabled %s", name);
1.109 markus 1146: debug("Next authentication method: %s", name);
1.53 markus 1147: return current;
1.23 markus 1148: }
1.1 markus 1149: }
1.53 markus 1150: }
1.1 markus 1151:
1.79 stevesk 1152: static char *
1.53 markus 1153: authmethods_get(void)
1154: {
1155: Authmethod *method = NULL;
1.93 markus 1156: Buffer b;
1157: char *list;
1.27 provos 1158:
1.93 markus 1159: buffer_init(&b);
1.53 markus 1160: for (method = authmethods; method->name != NULL; method++) {
1161: if (authmethod_is_enabled(method)) {
1.93 markus 1162: if (buffer_len(&b) > 0)
1163: buffer_append(&b, ",", 1);
1164: buffer_append(&b, method->name, strlen(method->name));
1.53 markus 1165: }
1166: }
1.93 markus 1167: buffer_append(&b, "\0", 1);
1168: list = xstrdup(buffer_ptr(&b));
1169: buffer_free(&b);
1170: return list;
1.1 markus 1171: }
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