Annotation of src/usr.bin/ssh/sshconnect2.c, Revision 1.213
1.213 ! djm 1: /* $OpenBSD: sshconnect2.c,v 1.212 2014/12/21 22:27:56 djm Exp $ */
1.1 markus 2: /*
3: * Copyright (c) 2000 Markus Friedl. All rights reserved.
1.170 djm 4: * Copyright (c) 2008 Damien Miller. All rights reserved.
1.1 markus 5: *
6: * Redistribution and use in source and binary forms, with or without
7: * modification, are permitted provided that the following conditions
8: * are met:
9: * 1. Redistributions of source code must retain the above copyright
10: * notice, this list of conditions and the following disclaimer.
11: * 2. Redistributions in binary form must reproduce the above copyright
12: * notice, this list of conditions and the following disclaimer in the
13: * documentation and/or other materials provided with the distribution.
14: *
15: * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
16: * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
17: * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
18: * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
19: * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
20: * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
21: * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
22: * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
23: * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
24: * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
25: */
26:
1.145 stevesk 27: #include <sys/types.h>
1.160 deraadt 28: #include <sys/socket.h>
1.145 stevesk 29: #include <sys/wait.h>
1.144 stevesk 30: #include <sys/queue.h>
1.146 stevesk 31: #include <sys/stat.h>
1.156 stevesk 32:
33: #include <errno.h>
1.174 dtucker 34: #include <fcntl.h>
1.164 jolan 35: #include <netdb.h>
1.159 stevesk 36: #include <stdio.h>
1.158 stevesk 37: #include <string.h>
1.160 deraadt 38: #include <signal.h>
39: #include <pwd.h>
1.157 stevesk 40: #include <unistd.h>
1.166 djm 41: #include <vis.h>
1.1 markus 42:
1.160 deraadt 43: #include "xmalloc.h"
1.1 markus 44: #include "ssh.h"
1.37 markus 45: #include "ssh2.h"
1.1 markus 46: #include "buffer.h"
47: #include "packet.h"
48: #include "compat.h"
1.37 markus 49: #include "cipher.h"
1.160 deraadt 50: #include "key.h"
1.1 markus 51: #include "kex.h"
52: #include "myproposal.h"
53: #include "sshconnect.h"
54: #include "authfile.h"
1.57 provos 55: #include "dh.h"
1.17 markus 56: #include "authfd.h"
1.37 markus 57: #include "log.h"
1.210 millert 58: #include "misc.h"
1.37 markus 59: #include "readconf.h"
1.53 markus 60: #include "match.h"
1.61 markus 61: #include "dispatch.h"
1.68 markus 62: #include "canohost.h"
1.100 markus 63: #include "msg.h"
64: #include "pathnames.h"
1.154 markus 65: #include "uidswap.h"
1.186 djm 66: #include "hostfile.h"
1.22 provos 67:
1.121 markus 68: #ifdef GSSAPI
69: #include "ssh-gss.h"
70: #endif
71:
1.1 markus 72: /* import */
73: extern char *client_version_string;
74: extern char *server_version_string;
75: extern Options options;
76:
77: /*
78: * SSH2 key exchange
79: */
80:
1.32 markus 81: u_char *session_id2 = NULL;
1.120 markus 82: u_int session_id2_len = 0;
1.1 markus 83:
1.61 markus 84: char *xxx_host;
85: struct sockaddr *xxx_hostaddr;
86:
1.63 markus 87: Kex *xxx_kex = NULL;
88:
1.76 itojun 89: static int
1.75 markus 90: verify_host_key_callback(Key *hostkey)
1.61 markus 91: {
1.75 markus 92: if (verify_host_key(xxx_host, xxx_hostaddr, hostkey) == -1)
1.83 markus 93: fatal("Host key verification failed.");
1.61 markus 94: return 0;
95: }
96:
1.186 djm 97: static char *
98: order_hostkeyalgs(char *host, struct sockaddr *hostaddr, u_short port)
99: {
100: char *oavail, *avail, *first, *last, *alg, *hostname, *ret;
101: size_t maxlen;
102: struct hostkeys *hostkeys;
103: int ktype;
1.188 djm 104: u_int i;
1.186 djm 105:
106: /* Find all hostkeys for this hostname */
107: get_hostfile_hostname_ipaddr(host, hostaddr, port, &hostname, NULL);
108: hostkeys = init_hostkeys();
1.188 djm 109: for (i = 0; i < options.num_user_hostfiles; i++)
110: load_hostkeys(hostkeys, hostname, options.user_hostfiles[i]);
111: for (i = 0; i < options.num_system_hostfiles; i++)
112: load_hostkeys(hostkeys, hostname, options.system_hostfiles[i]);
1.186 djm 113:
114: oavail = avail = xstrdup(KEX_DEFAULT_PK_ALG);
115: maxlen = strlen(avail) + 1;
116: first = xmalloc(maxlen);
117: last = xmalloc(maxlen);
118: *first = *last = '\0';
119:
120: #define ALG_APPEND(to, from) \
121: do { \
122: if (*to != '\0') \
123: strlcat(to, ",", maxlen); \
124: strlcat(to, from, maxlen); \
125: } while (0)
126:
127: while ((alg = strsep(&avail, ",")) && *alg != '\0') {
128: if ((ktype = key_type_from_name(alg)) == KEY_UNSPEC)
129: fatal("%s: unknown alg %s", __func__, alg);
130: if (lookup_key_in_hostkeys_by_type(hostkeys,
131: key_type_plain(ktype), NULL))
132: ALG_APPEND(first, alg);
133: else
134: ALG_APPEND(last, alg);
135: }
136: #undef ALG_APPEND
137: xasprintf(&ret, "%s%s%s", first, *first == '\0' ? "" : ",", last);
138: if (*first != '\0')
139: debug3("%s: prefer hostkeyalgs: %s", __func__, first);
140:
1.197 djm 141: free(first);
142: free(last);
143: free(hostname);
144: free(oavail);
1.186 djm 145: free_hostkeys(hostkeys);
146:
147: return ret;
148: }
149:
1.1 markus 150: void
1.186 djm 151: ssh_kex2(char *host, struct sockaddr *hostaddr, u_short port)
1.22 provos 152: {
1.205 markus 153: char *myproposal[PROPOSAL_MAX] = { KEX_CLIENT };
1.22 provos 154: Kex *kex;
1.61 markus 155:
156: xxx_host = host;
157: xxx_hostaddr = hostaddr;
1.22 provos 158:
1.29 markus 159: if (options.ciphers == (char *)-1) {
1.116 itojun 160: logit("No valid ciphers for protocol version 2 given, using defaults.");
1.29 markus 161: options.ciphers = NULL;
1.24 markus 162: }
1.22 provos 163: if (options.ciphers != NULL) {
164: myproposal[PROPOSAL_ENC_ALGS_CTOS] =
165: myproposal[PROPOSAL_ENC_ALGS_STOC] = options.ciphers;
166: }
1.60 stevesk 167: myproposal[PROPOSAL_ENC_ALGS_CTOS] =
168: compat_cipher_proposal(myproposal[PROPOSAL_ENC_ALGS_CTOS]);
169: myproposal[PROPOSAL_ENC_ALGS_STOC] =
170: compat_cipher_proposal(myproposal[PROPOSAL_ENC_ALGS_STOC]);
1.22 provos 171: if (options.compression) {
1.47 markus 172: myproposal[PROPOSAL_COMP_ALGS_CTOS] =
1.141 markus 173: myproposal[PROPOSAL_COMP_ALGS_STOC] = "zlib@openssh.com,zlib,none";
1.22 provos 174: } else {
1.47 markus 175: myproposal[PROPOSAL_COMP_ALGS_CTOS] =
1.141 markus 176: myproposal[PROPOSAL_COMP_ALGS_STOC] = "none,zlib@openssh.com,zlib";
1.47 markus 177: }
178: if (options.macs != NULL) {
179: myproposal[PROPOSAL_MAC_ALGS_CTOS] =
180: myproposal[PROPOSAL_MAC_ALGS_STOC] = options.macs;
1.22 provos 181: }
1.70 markus 182: if (options.hostkeyalgorithms != NULL)
1.88 deraadt 183: myproposal[PROPOSAL_SERVER_HOST_KEY_ALGS] =
1.200 djm 184: compat_pkalg_proposal(options.hostkeyalgorithms);
1.186 djm 185: else {
186: /* Prefer algorithms that we already have keys for */
187: myproposal[PROPOSAL_SERVER_HOST_KEY_ALGS] =
1.200 djm 188: compat_pkalg_proposal(
189: order_hostkeyalgs(host, hostaddr, port));
1.186 djm 190: }
1.185 djm 191: if (options.kex_algorithms != NULL)
192: myproposal[PROPOSAL_KEX_ALGS] = options.kex_algorithms;
1.206 djm 193: myproposal[PROPOSAL_KEX_ALGS] = compat_kex_proposal(
194: myproposal[PROPOSAL_KEX_ALGS]);
1.115 markus 195:
1.196 dtucker 196: if (options.rekey_limit || options.rekey_interval)
197: packet_set_rekey_limits((u_int32_t)options.rekey_limit,
198: (time_t)options.rekey_interval);
1.22 provos 199:
1.65 markus 200: /* start key exchange */
1.64 markus 201: kex = kex_setup(myproposal);
1.207 markus 202: #ifdef WITH_OPENSSL
1.111 markus 203: kex->kex[KEX_DH_GRP1_SHA1] = kexdh_client;
1.138 djm 204: kex->kex[KEX_DH_GRP14_SHA1] = kexdh_client;
1.111 markus 205: kex->kex[KEX_DH_GEX_SHA1] = kexgex_client;
1.147 djm 206: kex->kex[KEX_DH_GEX_SHA256] = kexgex_client;
1.184 djm 207: kex->kex[KEX_ECDH_SHA2] = kexecdh_client;
1.207 markus 208: #endif
1.199 markus 209: kex->kex[KEX_C25519_SHA256] = kexc25519_client;
1.61 markus 210: kex->client_version_string=client_version_string;
211: kex->server_version_string=server_version_string;
1.75 markus 212: kex->verify_host_key=&verify_host_key_callback;
1.63 markus 213:
214: xxx_kex = kex;
1.22 provos 215:
1.66 markus 216: dispatch_run(DISPATCH_BLOCK, &kex->done, kex);
1.173 andreas 217:
218: if (options.use_roaming && !kex->roaming) {
219: debug("Roaming not allowed by server");
220: options.use_roaming = 0;
221: }
1.62 markus 222:
223: session_id2 = kex->session_id;
224: session_id2_len = kex->session_id_len;
1.22 provos 225:
226: #ifdef DEBUG_KEXDH
227: /* send 1st encrypted/maced/compressed message */
228: packet_start(SSH2_MSG_IGNORE);
229: packet_put_cstring("markus");
230: packet_send();
231: packet_write_wait();
232: #endif
1.1 markus 233: }
1.11 markus 234:
1.1 markus 235: /*
236: * Authenticate user
237: */
1.20 markus 238:
239: typedef struct Authctxt Authctxt;
240: typedef struct Authmethod Authmethod;
1.117 markus 241: typedef struct identity Identity;
242: typedef struct idlist Idlist;
1.20 markus 243:
1.117 markus 244: struct identity {
245: TAILQ_ENTRY(identity) next;
246: AuthenticationConnection *ac; /* set if agent supports key */
247: Key *key; /* public/private key */
248: char *filename; /* comment for agent-only keys */
249: int tried;
250: int isprivate; /* key points to the private key */
1.191 dtucker 251: int userprovided;
1.117 markus 252: };
253: TAILQ_HEAD(idlist, identity);
1.20 markus 254:
255: struct Authctxt {
256: const char *server_user;
1.68 markus 257: const char *local_user;
1.20 markus 258: const char *host;
259: const char *service;
1.23 markus 260: Authmethod *method;
1.183 djm 261: sig_atomic_t success;
1.51 markus 262: char *authlist;
1.68 markus 263: /* pubkey */
1.117 markus 264: Idlist keys;
1.68 markus 265: AuthenticationConnection *agent;
266: /* hostbased */
1.100 markus 267: Sensitive *sensitive;
1.82 markus 268: /* kbd-interactive */
269: int info_req_seen;
1.121 markus 270: /* generic */
271: void *methoddata;
1.20 markus 272: };
273: struct Authmethod {
274: char *name; /* string to compare against server's list */
275: int (*userauth)(Authctxt *authctxt);
1.170 djm 276: void (*cleanup)(Authctxt *authctxt);
1.20 markus 277: int *enabled; /* flag in option struct that enables method */
278: int *batch_flag; /* flag in option struct that disables method */
279: };
280:
1.92 markus 281: void input_userauth_success(int, u_int32_t, void *);
1.172 djm 282: void input_userauth_success_unexpected(int, u_int32_t, void *);
1.92 markus 283: void input_userauth_failure(int, u_int32_t, void *);
284: void input_userauth_banner(int, u_int32_t, void *);
285: void input_userauth_error(int, u_int32_t, void *);
286: void input_userauth_info_req(int, u_int32_t, void *);
287: void input_userauth_pk_ok(int, u_int32_t, void *);
1.99 markus 288: void input_userauth_passwd_changereq(int, u_int32_t, void *);
1.86 itojun 289:
290: int userauth_none(Authctxt *);
291: int userauth_pubkey(Authctxt *);
292: int userauth_passwd(Authctxt *);
293: int userauth_kbdint(Authctxt *);
294: int userauth_hostbased(Authctxt *);
1.20 markus 295:
1.121 markus 296: #ifdef GSSAPI
297: int userauth_gssapi(Authctxt *authctxt);
298: void input_gssapi_response(int type, u_int32_t, void *);
299: void input_gssapi_token(int type, u_int32_t, void *);
300: void input_gssapi_hash(int type, u_int32_t, void *);
301: void input_gssapi_error(int, u_int32_t, void *);
302: void input_gssapi_errtok(int, u_int32_t, void *);
303: #endif
304:
1.86 itojun 305: void userauth(Authctxt *, char *);
1.51 markus 306:
1.117 markus 307: static int sign_and_send_pubkey(Authctxt *, Identity *);
308: static void pubkey_prepare(Authctxt *);
309: static void pubkey_cleanup(Authctxt *);
1.191 dtucker 310: static Key *load_identity_file(char *, int);
1.76 itojun 311:
312: static Authmethod *authmethod_get(char *authlist);
313: static Authmethod *authmethod_lookup(const char *name);
314: static char *authmethods_get(void);
1.20 markus 315:
316: Authmethod authmethods[] = {
1.121 markus 317: #ifdef GSSAPI
1.132 markus 318: {"gssapi-with-mic",
1.121 markus 319: userauth_gssapi,
1.170 djm 320: NULL,
1.121 markus 321: &options.gss_authentication,
322: NULL},
323: #endif
1.81 markus 324: {"hostbased",
325: userauth_hostbased,
1.170 djm 326: NULL,
1.81 markus 327: &options.hostbased_authentication,
328: NULL},
1.20 markus 329: {"publickey",
330: userauth_pubkey,
1.170 djm 331: NULL,
1.28 markus 332: &options.pubkey_authentication,
1.20 markus 333: NULL},
1.81 markus 334: {"keyboard-interactive",
335: userauth_kbdint,
1.170 djm 336: NULL,
1.81 markus 337: &options.kbd_interactive_authentication,
338: &options.batch_mode},
1.20 markus 339: {"password",
340: userauth_passwd,
1.170 djm 341: NULL,
1.20 markus 342: &options.password_authentication,
1.23 markus 343: &options.batch_mode},
344: {"none",
345: userauth_none,
346: NULL,
1.170 djm 347: NULL,
1.23 markus 348: NULL},
1.170 djm 349: {NULL, NULL, NULL, NULL, NULL}
1.20 markus 350: };
351:
352: void
1.68 markus 353: ssh_userauth2(const char *local_user, const char *server_user, char *host,
1.100 markus 354: Sensitive *sensitive)
1.20 markus 355: {
356: Authctxt authctxt;
357: int type;
1.39 markus 358:
1.73 markus 359: if (options.challenge_response_authentication)
1.39 markus 360: options.kbd_interactive_authentication = 1;
1.20 markus 361:
362: packet_start(SSH2_MSG_SERVICE_REQUEST);
363: packet_put_cstring("ssh-userauth");
364: packet_send();
1.108 markus 365: debug("SSH2_MSG_SERVICE_REQUEST sent");
1.20 markus 366: packet_write_wait();
1.91 markus 367: type = packet_read();
1.108 markus 368: if (type != SSH2_MSG_SERVICE_ACCEPT)
369: fatal("Server denied authentication request: %d", type);
1.20 markus 370: if (packet_remaining() > 0) {
1.91 markus 371: char *reply = packet_get_string(NULL);
1.108 markus 372: debug2("service_accept: %s", reply);
1.197 djm 373: free(reply);
1.20 markus 374: } else {
1.109 markus 375: debug2("buggy server: service_accept w/o service");
1.20 markus 376: }
1.90 markus 377: packet_check_eom();
1.108 markus 378: debug("SSH2_MSG_SERVICE_ACCEPT received");
1.20 markus 379:
1.53 markus 380: if (options.preferred_authentications == NULL)
381: options.preferred_authentications = authmethods_get();
382:
1.20 markus 383: /* setup authentication context */
1.82 markus 384: memset(&authctxt, 0, sizeof(authctxt));
1.117 markus 385: pubkey_prepare(&authctxt);
1.20 markus 386: authctxt.server_user = server_user;
1.68 markus 387: authctxt.local_user = local_user;
1.20 markus 388: authctxt.host = host;
389: authctxt.service = "ssh-connection"; /* service name */
390: authctxt.success = 0;
1.23 markus 391: authctxt.method = authmethod_lookup("none");
1.51 markus 392: authctxt.authlist = NULL;
1.121 markus 393: authctxt.methoddata = NULL;
1.100 markus 394: authctxt.sensitive = sensitive;
1.82 markus 395: authctxt.info_req_seen = 0;
1.23 markus 396: if (authctxt.method == NULL)
397: fatal("ssh_userauth2: internal error: cannot send userauth none request");
1.20 markus 398:
399: /* initial userauth request */
1.23 markus 400: userauth_none(&authctxt);
1.20 markus 401:
1.65 markus 402: dispatch_init(&input_userauth_error);
1.20 markus 403: dispatch_set(SSH2_MSG_USERAUTH_SUCCESS, &input_userauth_success);
404: dispatch_set(SSH2_MSG_USERAUTH_FAILURE, &input_userauth_failure);
1.35 markus 405: dispatch_set(SSH2_MSG_USERAUTH_BANNER, &input_userauth_banner);
1.20 markus 406: dispatch_run(DISPATCH_BLOCK, &authctxt.success, &authctxt); /* loop until success */
407:
1.117 markus 408: pubkey_cleanup(&authctxt);
1.119 markus 409: dispatch_range(SSH2_MSG_USERAUTH_MIN, SSH2_MSG_USERAUTH_MAX, NULL);
410:
1.109 markus 411: debug("Authentication succeeded (%s).", authctxt.method->name);
1.20 markus 412: }
1.119 markus 413:
1.20 markus 414: void
1.51 markus 415: userauth(Authctxt *authctxt, char *authlist)
416: {
1.170 djm 417: if (authctxt->method != NULL && authctxt->method->cleanup != NULL)
418: authctxt->method->cleanup(authctxt);
419:
1.197 djm 420: free(authctxt->methoddata);
421: authctxt->methoddata = NULL;
1.51 markus 422: if (authlist == NULL) {
423: authlist = authctxt->authlist;
424: } else {
1.197 djm 425: free(authctxt->authlist);
1.51 markus 426: authctxt->authlist = authlist;
427: }
428: for (;;) {
429: Authmethod *method = authmethod_get(authlist);
430: if (method == NULL)
431: fatal("Permission denied (%s).", authlist);
432: authctxt->method = method;
1.119 markus 433:
434: /* reset the per method handler */
435: dispatch_range(SSH2_MSG_USERAUTH_PER_METHOD_MIN,
436: SSH2_MSG_USERAUTH_PER_METHOD_MAX, NULL);
437:
438: /* and try new method */
1.51 markus 439: if (method->userauth(authctxt) != 0) {
440: debug2("we sent a %s packet, wait for reply", method->name);
441: break;
442: } else {
443: debug2("we did not send a packet, disable method");
444: method->enabled = NULL;
445: }
446: }
447: }
1.105 deraadt 448:
1.169 djm 449: /* ARGSUSED */
1.51 markus 450: void
1.92 markus 451: input_userauth_error(int type, u_int32_t seq, void *ctxt)
1.20 markus 452: {
1.35 markus 453: fatal("input_userauth_error: bad message during authentication: "
1.140 djm 454: "type %d", type);
1.35 markus 455: }
1.105 deraadt 456:
1.169 djm 457: /* ARGSUSED */
1.35 markus 458: void
1.92 markus 459: input_userauth_banner(int type, u_int32_t seq, void *ctxt)
1.35 markus 460: {
1.166 djm 461: char *msg, *raw, *lang;
462: u_int len;
1.126 deraadt 463:
1.35 markus 464: debug3("input_userauth_banner");
1.166 djm 465: raw = packet_get_string(&len);
1.35 markus 466: lang = packet_get_string(NULL);
1.167 markus 467: if (len > 0 && options.log_level >= SYSLOG_LEVEL_INFO) {
1.166 djm 468: if (len > 65536)
469: len = 65536;
1.168 deraadt 470: msg = xmalloc(len * 4 + 1); /* max expansion from strnvis() */
1.177 dtucker 471: strnvis(msg, raw, len * 4 + 1, VIS_SAFE|VIS_OCTAL|VIS_NOSLASH);
1.125 dtucker 472: fprintf(stderr, "%s", msg);
1.197 djm 473: free(msg);
1.166 djm 474: }
1.197 djm 475: free(raw);
476: free(lang);
1.20 markus 477: }
1.105 deraadt 478:
1.169 djm 479: /* ARGSUSED */
1.20 markus 480: void
1.92 markus 481: input_userauth_success(int type, u_int32_t seq, void *ctxt)
1.20 markus 482: {
483: Authctxt *authctxt = ctxt;
1.172 djm 484:
1.20 markus 485: if (authctxt == NULL)
486: fatal("input_userauth_success: no authentication context");
1.197 djm 487: free(authctxt->authlist);
488: authctxt->authlist = NULL;
1.172 djm 489: if (authctxt->method != NULL && authctxt->method->cleanup != NULL)
490: authctxt->method->cleanup(authctxt);
1.197 djm 491: free(authctxt->methoddata);
492: authctxt->methoddata = NULL;
1.20 markus 493: authctxt->success = 1; /* break out */
494: }
1.105 deraadt 495:
1.172 djm 496: void
497: input_userauth_success_unexpected(int type, u_int32_t seq, void *ctxt)
498: {
499: Authctxt *authctxt = ctxt;
500:
501: if (authctxt == NULL)
502: fatal("%s: no authentication context", __func__);
503:
504: fatal("Unexpected authentication success during %s.",
505: authctxt->method->name);
506: }
507:
1.169 djm 508: /* ARGSUSED */
1.20 markus 509: void
1.92 markus 510: input_userauth_failure(int type, u_int32_t seq, void *ctxt)
1.20 markus 511: {
512: Authctxt *authctxt = ctxt;
513: char *authlist = NULL;
514: int partial;
515:
516: if (authctxt == NULL)
517: fatal("input_userauth_failure: no authentication context");
518:
1.23 markus 519: authlist = packet_get_string(NULL);
1.20 markus 520: partial = packet_get_char();
1.90 markus 521: packet_check_eom();
1.20 markus 522:
1.193 markus 523: if (partial != 0) {
1.116 itojun 524: logit("Authenticated with partial success.");
1.193 markus 525: /* reset state */
526: pubkey_cleanup(authctxt);
527: pubkey_prepare(authctxt);
528: }
1.109 markus 529: debug("Authentications that can continue: %s", authlist);
1.20 markus 530:
1.51 markus 531: userauth(authctxt, authlist);
532: }
1.169 djm 533:
534: /* ARGSUSED */
1.51 markus 535: void
1.92 markus 536: input_userauth_pk_ok(int type, u_int32_t seq, void *ctxt)
1.51 markus 537: {
538: Authctxt *authctxt = ctxt;
539: Key *key = NULL;
1.117 markus 540: Identity *id = NULL;
1.51 markus 541: Buffer b;
1.96 markus 542: int pktype, sent = 0;
543: u_int alen, blen;
544: char *pkalg, *fp;
545: u_char *pkblob;
1.51 markus 546:
547: if (authctxt == NULL)
548: fatal("input_userauth_pk_ok: no authentication context");
549: if (datafellows & SSH_BUG_PKOK) {
550: /* this is similar to SSH_BUG_PKAUTH */
551: debug2("input_userauth_pk_ok: SSH_BUG_PKOK");
552: pkblob = packet_get_string(&blen);
553: buffer_init(&b);
554: buffer_append(&b, pkblob, blen);
555: pkalg = buffer_get_string(&b, &alen);
556: buffer_free(&b);
557: } else {
558: pkalg = packet_get_string(&alen);
559: pkblob = packet_get_string(&blen);
560: }
1.90 markus 561: packet_check_eom();
1.51 markus 562:
1.117 markus 563: debug("Server accepts key: pkalg %s blen %u", pkalg, blen);
1.51 markus 564:
1.117 markus 565: if ((pktype = key_type_from_name(pkalg)) == KEY_UNSPEC) {
566: debug("unknown pkalg %s", pkalg);
567: goto done;
568: }
569: if ((key = key_from_blob(pkblob, blen)) == NULL) {
570: debug("no key from blob. pkalg %s", pkalg);
571: goto done;
572: }
573: if (key->type != pktype) {
574: error("input_userauth_pk_ok: type mismatch "
575: "for decoded key (received %d, expected %d)",
576: key->type, pktype);
577: goto done;
578: }
1.212 djm 579: fp = key_fingerprint(key, options.fingerprint_hash, SSH_FP_DEFAULT);
1.117 markus 580: debug2("input_userauth_pk_ok: fp %s", fp);
1.197 djm 581: free(fp);
1.117 markus 582:
1.127 markus 583: /*
584: * search keys in the reverse order, because last candidate has been
585: * moved to the end of the queue. this also avoids confusion by
586: * duplicate keys
587: */
1.136 henning 588: TAILQ_FOREACH_REVERSE(id, &authctxt->keys, idlist, next) {
1.117 markus 589: if (key_equal(key, id->key)) {
590: sent = sign_and_send_pubkey(authctxt, id);
1.51 markus 591: break;
592: }
1.117 markus 593: }
594: done:
1.51 markus 595: if (key != NULL)
596: key_free(key);
1.197 djm 597: free(pkalg);
598: free(pkblob);
1.51 markus 599:
1.106 deraadt 600: /* try another method if we did not send a packet */
1.51 markus 601: if (sent == 0)
602: userauth(authctxt, NULL);
1.20 markus 603: }
1.121 markus 604:
605: #ifdef GSSAPI
1.133 djm 606: int
1.121 markus 607: userauth_gssapi(Authctxt *authctxt)
608: {
609: Gssctxt *gssctxt = NULL;
1.128 avsm 610: static gss_OID_set gss_supported = NULL;
1.139 djm 611: static u_int mech = 0;
1.121 markus 612: OM_uint32 min;
613: int ok = 0;
614:
615: /* Try one GSSAPI method at a time, rather than sending them all at
616: * once. */
617:
1.128 avsm 618: if (gss_supported == NULL)
619: gss_indicate_mechs(&min, &gss_supported);
1.121 markus 620:
621: /* Check to see if the mechanism is usable before we offer it */
1.128 avsm 622: while (mech < gss_supported->count && !ok) {
1.121 markus 623: /* My DER encoding requires length<128 */
1.128 avsm 624: if (gss_supported->elements[mech].length < 128 &&
1.161 djm 625: ssh_gssapi_check_mechanism(&gssctxt,
626: &gss_supported->elements[mech], authctxt->host)) {
1.121 markus 627: ok = 1; /* Mechanism works */
628: } else {
629: mech++;
630: }
631: }
632:
1.161 djm 633: if (!ok)
1.139 djm 634: return 0;
1.121 markus 635:
636: authctxt->methoddata=(void *)gssctxt;
637:
638: packet_start(SSH2_MSG_USERAUTH_REQUEST);
639: packet_put_cstring(authctxt->server_user);
640: packet_put_cstring(authctxt->service);
641: packet_put_cstring(authctxt->method->name);
642:
643: packet_put_int(1);
644:
1.129 markus 645: packet_put_int((gss_supported->elements[mech].length) + 2);
646: packet_put_char(SSH_GSS_OIDTYPE);
647: packet_put_char(gss_supported->elements[mech].length);
648: packet_put_raw(gss_supported->elements[mech].elements,
649: gss_supported->elements[mech].length);
1.121 markus 650:
651: packet_send();
652:
653: dispatch_set(SSH2_MSG_USERAUTH_GSSAPI_RESPONSE, &input_gssapi_response);
654: dispatch_set(SSH2_MSG_USERAUTH_GSSAPI_TOKEN, &input_gssapi_token);
655: dispatch_set(SSH2_MSG_USERAUTH_GSSAPI_ERROR, &input_gssapi_error);
656: dispatch_set(SSH2_MSG_USERAUTH_GSSAPI_ERRTOK, &input_gssapi_errtok);
657:
658: mech++; /* Move along to next candidate */
659:
660: return 1;
661: }
662:
1.130 markus 663: static OM_uint32
664: process_gssapi_token(void *ctxt, gss_buffer_t recv_tok)
665: {
666: Authctxt *authctxt = ctxt;
667: Gssctxt *gssctxt = authctxt->methoddata;
668: gss_buffer_desc send_tok = GSS_C_EMPTY_BUFFER;
1.142 djm 669: gss_buffer_desc mic = GSS_C_EMPTY_BUFFER;
670: gss_buffer_desc gssbuf;
1.132 markus 671: OM_uint32 status, ms, flags;
672: Buffer b;
1.133 djm 673:
1.130 markus 674: status = ssh_gssapi_init_ctx(gssctxt, options.gss_deleg_creds,
1.132 markus 675: recv_tok, &send_tok, &flags);
1.130 markus 676:
677: if (send_tok.length > 0) {
678: if (GSS_ERROR(status))
679: packet_start(SSH2_MSG_USERAUTH_GSSAPI_ERRTOK);
680: else
681: packet_start(SSH2_MSG_USERAUTH_GSSAPI_TOKEN);
1.133 djm 682:
1.130 markus 683: packet_put_string(send_tok.value, send_tok.length);
684: packet_send();
685: gss_release_buffer(&ms, &send_tok);
686: }
1.133 djm 687:
1.130 markus 688: if (status == GSS_S_COMPLETE) {
1.132 markus 689: /* send either complete or MIC, depending on mechanism */
690: if (!(flags & GSS_C_INTEG_FLAG)) {
691: packet_start(SSH2_MSG_USERAUTH_GSSAPI_EXCHANGE_COMPLETE);
692: packet_send();
693: } else {
694: ssh_gssapi_buildmic(&b, authctxt->server_user,
695: authctxt->service, "gssapi-with-mic");
696:
697: gssbuf.value = buffer_ptr(&b);
698: gssbuf.length = buffer_len(&b);
1.133 djm 699:
1.132 markus 700: status = ssh_gssapi_sign(gssctxt, &gssbuf, &mic);
1.133 djm 701:
1.132 markus 702: if (!GSS_ERROR(status)) {
703: packet_start(SSH2_MSG_USERAUTH_GSSAPI_MIC);
704: packet_put_string(mic.value, mic.length);
1.133 djm 705:
1.132 markus 706: packet_send();
707: }
1.133 djm 708:
1.132 markus 709: buffer_free(&b);
710: gss_release_buffer(&ms, &mic);
1.133 djm 711: }
1.130 markus 712: }
1.133 djm 713:
1.130 markus 714: return status;
715: }
716:
1.169 djm 717: /* ARGSUSED */
1.121 markus 718: void
719: input_gssapi_response(int type, u_int32_t plen, void *ctxt)
720: {
721: Authctxt *authctxt = ctxt;
722: Gssctxt *gssctxt;
723: int oidlen;
724: char *oidv;
725:
726: if (authctxt == NULL)
727: fatal("input_gssapi_response: no authentication context");
728: gssctxt = authctxt->methoddata;
729:
730: /* Setup our OID */
731: oidv = packet_get_string(&oidlen);
732:
1.129 markus 733: if (oidlen <= 2 ||
734: oidv[0] != SSH_GSS_OIDTYPE ||
735: oidv[1] != oidlen - 2) {
1.197 djm 736: free(oidv);
1.129 markus 737: debug("Badly encoded mechanism OID received");
738: userauth(authctxt, NULL);
739: return;
1.121 markus 740: }
1.129 markus 741:
742: if (!ssh_gssapi_check_oid(gssctxt, oidv + 2, oidlen - 2))
743: fatal("Server returned different OID than expected");
1.121 markus 744:
745: packet_check_eom();
746:
1.197 djm 747: free(oidv);
1.121 markus 748:
1.130 markus 749: if (GSS_ERROR(process_gssapi_token(ctxt, GSS_C_NO_BUFFER))) {
1.121 markus 750: /* Start again with next method on list */
751: debug("Trying to start again");
752: userauth(authctxt, NULL);
753: return;
754: }
755: }
756:
1.169 djm 757: /* ARGSUSED */
1.121 markus 758: void
759: input_gssapi_token(int type, u_int32_t plen, void *ctxt)
760: {
761: Authctxt *authctxt = ctxt;
762: gss_buffer_desc recv_tok;
1.130 markus 763: OM_uint32 status;
1.121 markus 764: u_int slen;
765:
766: if (authctxt == NULL)
767: fatal("input_gssapi_response: no authentication context");
768:
769: recv_tok.value = packet_get_string(&slen);
770: recv_tok.length = slen; /* safe typecast */
771:
772: packet_check_eom();
773:
1.130 markus 774: status = process_gssapi_token(ctxt, &recv_tok);
1.121 markus 775:
1.197 djm 776: free(recv_tok.value);
1.121 markus 777:
778: if (GSS_ERROR(status)) {
779: /* Start again with the next method in the list */
780: userauth(authctxt, NULL);
781: return;
782: }
783: }
784:
1.169 djm 785: /* ARGSUSED */
1.121 markus 786: void
787: input_gssapi_errtok(int type, u_int32_t plen, void *ctxt)
788: {
789: Authctxt *authctxt = ctxt;
790: Gssctxt *gssctxt;
791: gss_buffer_desc send_tok = GSS_C_EMPTY_BUFFER;
792: gss_buffer_desc recv_tok;
1.194 djm 793: OM_uint32 ms;
1.123 deraadt 794: u_int len;
1.121 markus 795:
796: if (authctxt == NULL)
797: fatal("input_gssapi_response: no authentication context");
798: gssctxt = authctxt->methoddata;
799:
1.123 deraadt 800: recv_tok.value = packet_get_string(&len);
801: recv_tok.length = len;
1.121 markus 802:
803: packet_check_eom();
804:
805: /* Stick it into GSSAPI and see what it says */
1.194 djm 806: (void)ssh_gssapi_init_ctx(gssctxt, options.gss_deleg_creds,
1.140 djm 807: &recv_tok, &send_tok, NULL);
1.121 markus 808:
1.197 djm 809: free(recv_tok.value);
1.121 markus 810: gss_release_buffer(&ms, &send_tok);
811:
812: /* Server will be returning a failed packet after this one */
813: }
814:
1.169 djm 815: /* ARGSUSED */
1.121 markus 816: void
817: input_gssapi_error(int type, u_int32_t plen, void *ctxt)
818: {
819: char *msg;
820: char *lang;
821:
1.194 djm 822: /* maj */(void)packet_get_int();
823: /* min */(void)packet_get_int();
1.121 markus 824: msg=packet_get_string(NULL);
825: lang=packet_get_string(NULL);
826:
827: packet_check_eom();
828:
1.143 stevesk 829: debug("Server GSSAPI Error:\n%s", msg);
1.197 djm 830: free(msg);
831: free(lang);
1.121 markus 832: }
833: #endif /* GSSAPI */
1.20 markus 834:
1.1 markus 835: int
1.23 markus 836: userauth_none(Authctxt *authctxt)
837: {
838: /* initial userauth request */
839: packet_start(SSH2_MSG_USERAUTH_REQUEST);
840: packet_put_cstring(authctxt->server_user);
841: packet_put_cstring(authctxt->service);
842: packet_put_cstring(authctxt->method->name);
843: packet_send();
844: return 1;
845: }
846:
847: int
1.20 markus 848: userauth_passwd(Authctxt *authctxt)
1.1 markus 849: {
1.6 markus 850: static int attempt = 0;
1.99 markus 851: char prompt[150];
1.1 markus 852: char *password;
1.175 dtucker 853: const char *host = options.host_key_alias ? options.host_key_alias :
854: authctxt->host;
1.6 markus 855:
1.13 todd 856: if (attempt++ >= options.number_of_password_prompts)
1.6 markus 857: return 0;
1.13 todd 858:
1.87 deraadt 859: if (attempt != 1)
1.13 todd 860: error("Permission denied, please try again.");
1.1 markus 861:
1.43 itojun 862: snprintf(prompt, sizeof(prompt), "%.30s@%.128s's password: ",
1.175 dtucker 863: authctxt->server_user, host);
1.1 markus 864: password = read_passphrase(prompt, 0);
865: packet_start(SSH2_MSG_USERAUTH_REQUEST);
1.20 markus 866: packet_put_cstring(authctxt->server_user);
867: packet_put_cstring(authctxt->service);
1.23 markus 868: packet_put_cstring(authctxt->method->name);
1.1 markus 869: packet_put_char(0);
1.49 markus 870: packet_put_cstring(password);
1.204 djm 871: explicit_bzero(password, strlen(password));
1.197 djm 872: free(password);
1.85 markus 873: packet_add_padding(64);
1.1 markus 874: packet_send();
1.99 markus 875:
1.104 deraadt 876: dispatch_set(SSH2_MSG_USERAUTH_PASSWD_CHANGEREQ,
1.99 markus 877: &input_userauth_passwd_changereq);
878:
1.1 markus 879: return 1;
880: }
1.169 djm 881:
1.99 markus 882: /*
883: * parse PASSWD_CHANGEREQ, prompt user and send SSH2_MSG_USERAUTH_REQUEST
884: */
1.169 djm 885: /* ARGSUSED */
1.99 markus 886: void
1.153 djm 887: input_userauth_passwd_changereq(int type, u_int32_t seqnr, void *ctxt)
1.99 markus 888: {
889: Authctxt *authctxt = ctxt;
890: char *info, *lang, *password = NULL, *retype = NULL;
891: char prompt[150];
1.175 dtucker 892: const char *host = options.host_key_alias ? options.host_key_alias :
893: authctxt->host;
1.99 markus 894:
895: debug2("input_userauth_passwd_changereq");
896:
897: if (authctxt == NULL)
898: fatal("input_userauth_passwd_changereq: "
899: "no authentication context");
900:
901: info = packet_get_string(NULL);
902: lang = packet_get_string(NULL);
903: if (strlen(info) > 0)
1.116 itojun 904: logit("%s", info);
1.197 djm 905: free(info);
906: free(lang);
1.99 markus 907: packet_start(SSH2_MSG_USERAUTH_REQUEST);
908: packet_put_cstring(authctxt->server_user);
909: packet_put_cstring(authctxt->service);
910: packet_put_cstring(authctxt->method->name);
911: packet_put_char(1); /* additional info */
1.104 deraadt 912: snprintf(prompt, sizeof(prompt),
1.99 markus 913: "Enter %.30s@%.128s's old password: ",
1.175 dtucker 914: authctxt->server_user, host);
1.99 markus 915: password = read_passphrase(prompt, 0);
916: packet_put_cstring(password);
1.204 djm 917: explicit_bzero(password, strlen(password));
1.197 djm 918: free(password);
1.99 markus 919: password = NULL;
920: while (password == NULL) {
1.104 deraadt 921: snprintf(prompt, sizeof(prompt),
1.99 markus 922: "Enter %.30s@%.128s's new password: ",
1.175 dtucker 923: authctxt->server_user, host);
1.99 markus 924: password = read_passphrase(prompt, RP_ALLOW_EOF);
925: if (password == NULL) {
926: /* bail out */
927: return;
928: }
1.104 deraadt 929: snprintf(prompt, sizeof(prompt),
1.99 markus 930: "Retype %.30s@%.128s's new password: ",
1.175 dtucker 931: authctxt->server_user, host);
1.99 markus 932: retype = read_passphrase(prompt, 0);
933: if (strcmp(password, retype) != 0) {
1.204 djm 934: explicit_bzero(password, strlen(password));
1.197 djm 935: free(password);
1.116 itojun 936: logit("Mismatch; try again, EOF to quit.");
1.99 markus 937: password = NULL;
938: }
1.204 djm 939: explicit_bzero(retype, strlen(retype));
1.197 djm 940: free(retype);
1.99 markus 941: }
942: packet_put_cstring(password);
1.204 djm 943: explicit_bzero(password, strlen(password));
1.197 djm 944: free(password);
1.99 markus 945: packet_add_padding(64);
946: packet_send();
1.104 deraadt 947:
948: dispatch_set(SSH2_MSG_USERAUTH_PASSWD_CHANGEREQ,
1.99 markus 949: &input_userauth_passwd_changereq);
1.117 markus 950: }
951:
952: static int
953: identity_sign(Identity *id, u_char **sigp, u_int *lenp,
954: u_char *data, u_int datalen)
955: {
956: Key *prv;
957: int ret;
1.99 markus 958:
1.117 markus 959: /* the agent supports this key */
960: if (id->ac)
961: return (ssh_agent_sign(id->ac, id->key, sigp, lenp,
962: data, datalen));
963: /*
964: * we have already loaded the private key or
965: * the private key is stored in external hardware
966: */
1.209 djm 967: if (id->isprivate || (id->key->flags & SSHKEY_FLAG_EXT))
1.117 markus 968: return (key_sign(id->key, sigp, lenp, data, datalen));
969: /* load the private key from the file */
1.191 dtucker 970: if ((prv = load_identity_file(id->filename, id->userprovided)) == NULL)
1.117 markus 971: return (-1);
972: ret = key_sign(prv, sigp, lenp, data, datalen);
973: key_free(prv);
974: return (ret);
1.51 markus 975: }
976:
1.76 itojun 977: static int
1.117 markus 978: sign_and_send_pubkey(Authctxt *authctxt, Identity *id)
1.1 markus 979: {
980: Buffer b;
1.32 markus 981: u_char *blob, *signature;
1.96 markus 982: u_int bloblen, slen;
1.120 markus 983: u_int skip = 0;
1.17 markus 984: int ret = -1;
1.23 markus 985: int have_sig = 1;
1.182 djm 986: char *fp;
1.1 markus 987:
1.212 djm 988: fp = key_fingerprint(id->key, options.fingerprint_hash, SSH_FP_DEFAULT);
1.182 djm 989: debug3("sign_and_send_pubkey: %s %s", key_type(id->key), fp);
1.197 djm 990: free(fp);
1.51 markus 991:
1.117 markus 992: if (key_to_blob(id->key, &blob, &bloblen) == 0) {
1.28 markus 993: /* we cannot handle this key */
1.30 markus 994: debug3("sign_and_send_pubkey: cannot handle key");
1.28 markus 995: return 0;
996: }
1.1 markus 997: /* data to be signed */
998: buffer_init(&b);
1.26 markus 999: if (datafellows & SSH_OLD_SESSIONID) {
1000: buffer_append(&b, session_id2, session_id2_len);
1.41 stevesk 1001: skip = session_id2_len;
1.26 markus 1002: } else {
1.14 markus 1003: buffer_put_string(&b, session_id2, session_id2_len);
1004: skip = buffer_len(&b);
1005: }
1.1 markus 1006: buffer_put_char(&b, SSH2_MSG_USERAUTH_REQUEST);
1.20 markus 1007: buffer_put_cstring(&b, authctxt->server_user);
1.10 markus 1008: buffer_put_cstring(&b,
1.30 markus 1009: datafellows & SSH_BUG_PKSERVICE ?
1.10 markus 1010: "ssh-userauth" :
1.20 markus 1011: authctxt->service);
1.30 markus 1012: if (datafellows & SSH_BUG_PKAUTH) {
1013: buffer_put_char(&b, have_sig);
1014: } else {
1015: buffer_put_cstring(&b, authctxt->method->name);
1016: buffer_put_char(&b, have_sig);
1.117 markus 1017: buffer_put_cstring(&b, key_ssh_name(id->key));
1.30 markus 1018: }
1.1 markus 1019: buffer_put_string(&b, blob, bloblen);
1020:
1021: /* generate signature */
1.117 markus 1022: ret = identity_sign(id, &signature, &slen,
1.51 markus 1023: buffer_ptr(&b), buffer_len(&b));
1.17 markus 1024: if (ret == -1) {
1.197 djm 1025: free(blob);
1.17 markus 1026: buffer_free(&b);
1027: return 0;
1028: }
1.28 markus 1029: #ifdef DEBUG_PK
1.1 markus 1030: buffer_dump(&b);
1031: #endif
1.30 markus 1032: if (datafellows & SSH_BUG_PKSERVICE) {
1.10 markus 1033: buffer_clear(&b);
1034: buffer_append(&b, session_id2, session_id2_len);
1.51 markus 1035: skip = session_id2_len;
1.10 markus 1036: buffer_put_char(&b, SSH2_MSG_USERAUTH_REQUEST);
1.20 markus 1037: buffer_put_cstring(&b, authctxt->server_user);
1038: buffer_put_cstring(&b, authctxt->service);
1.23 markus 1039: buffer_put_cstring(&b, authctxt->method->name);
1040: buffer_put_char(&b, have_sig);
1.30 markus 1041: if (!(datafellows & SSH_BUG_PKAUTH))
1.117 markus 1042: buffer_put_cstring(&b, key_ssh_name(id->key));
1.10 markus 1043: buffer_put_string(&b, blob, bloblen);
1044: }
1.197 djm 1045: free(blob);
1.51 markus 1046:
1.1 markus 1047: /* append signature */
1048: buffer_put_string(&b, signature, slen);
1.197 djm 1049: free(signature);
1.1 markus 1050:
1051: /* skip session id and packet type */
1.14 markus 1052: if (buffer_len(&b) < skip + 1)
1.20 markus 1053: fatal("userauth_pubkey: internal error");
1.14 markus 1054: buffer_consume(&b, skip + 1);
1.1 markus 1055:
1056: /* put remaining data from buffer into packet */
1057: packet_start(SSH2_MSG_USERAUTH_REQUEST);
1058: packet_put_raw(buffer_ptr(&b), buffer_len(&b));
1059: buffer_free(&b);
1060: packet_send();
1.17 markus 1061:
1062: return 1;
1.16 markus 1063: }
1064:
1.76 itojun 1065: static int
1.117 markus 1066: send_pubkey_test(Authctxt *authctxt, Identity *id)
1.20 markus 1067: {
1.51 markus 1068: u_char *blob;
1.97 markus 1069: u_int bloblen, have_sig = 0;
1.20 markus 1070:
1.51 markus 1071: debug3("send_pubkey_test");
1.16 markus 1072:
1.117 markus 1073: if (key_to_blob(id->key, &blob, &bloblen) == 0) {
1.51 markus 1074: /* we cannot handle this key */
1075: debug3("send_pubkey_test: cannot handle key");
1.16 markus 1076: return 0;
1077: }
1.51 markus 1078: /* register callback for USERAUTH_PK_OK message */
1079: dispatch_set(SSH2_MSG_USERAUTH_PK_OK, &input_userauth_pk_ok);
1080:
1081: packet_start(SSH2_MSG_USERAUTH_REQUEST);
1082: packet_put_cstring(authctxt->server_user);
1083: packet_put_cstring(authctxt->service);
1084: packet_put_cstring(authctxt->method->name);
1085: packet_put_char(have_sig);
1086: if (!(datafellows & SSH_BUG_PKAUTH))
1.117 markus 1087: packet_put_cstring(key_ssh_name(id->key));
1.51 markus 1088: packet_put_string(blob, bloblen);
1.197 djm 1089: free(blob);
1.51 markus 1090: packet_send();
1091: return 1;
1092: }
1093:
1.76 itojun 1094: static Key *
1.191 dtucker 1095: load_identity_file(char *filename, int userprovided)
1.51 markus 1096: {
1097: Key *private;
1098: char prompt[300], *passphrase;
1.178 dtucker 1099: int perm_ok = 0, quit, i;
1.52 markus 1100: struct stat st;
1.16 markus 1101:
1.52 markus 1102: if (stat(filename, &st) < 0) {
1.191 dtucker 1103: (userprovided ? logit : debug3)("no such identity: %s: %s",
1104: filename, strerror(errno));
1.52 markus 1105: return NULL;
1106: }
1.152 dtucker 1107: private = key_load_private_type(KEY_UNSPEC, filename, "", NULL, &perm_ok);
1.198 dtucker 1108: if (!perm_ok) {
1109: if (private != NULL)
1110: key_free(private);
1.152 dtucker 1111: return NULL;
1.198 dtucker 1112: }
1.56 markus 1113: if (private == NULL) {
1114: if (options.batch_mode)
1.51 markus 1115: return NULL;
1.16 markus 1116: snprintf(prompt, sizeof prompt,
1.88 deraadt 1117: "Enter passphrase for key '%.100s': ", filename);
1.20 markus 1118: for (i = 0; i < options.number_of_password_prompts; i++) {
1119: passphrase = read_passphrase(prompt, 0);
1120: if (strcmp(passphrase, "") != 0) {
1.152 dtucker 1121: private = key_load_private_type(KEY_UNSPEC,
1122: filename, passphrase, NULL, NULL);
1.51 markus 1123: quit = 0;
1.20 markus 1124: } else {
1125: debug2("no passphrase given, try next key");
1.51 markus 1126: quit = 1;
1.20 markus 1127: }
1.204 djm 1128: explicit_bzero(passphrase, strlen(passphrase));
1.197 djm 1129: free(passphrase);
1.56 markus 1130: if (private != NULL || quit)
1.20 markus 1131: break;
1132: debug2("bad passphrase given, try again...");
1.16 markus 1133: }
1134: }
1.51 markus 1135: return private;
1136: }
1137:
1.117 markus 1138: /*
1139: * try keys in the following order:
1140: * 1. agent keys that are found in the config file
1141: * 2. other agent keys
1142: * 3. keys that are only listed in the config file
1143: */
1144: static void
1145: pubkey_prepare(Authctxt *authctxt)
1.51 markus 1146: {
1.190 djm 1147: Identity *id, *id2, *tmp;
1.117 markus 1148: Idlist agent, files, *preferred;
1149: Key *key;
1150: AuthenticationConnection *ac;
1151: char *comment;
1152: int i, found;
1.51 markus 1153:
1.117 markus 1154: TAILQ_INIT(&agent); /* keys from the agent */
1155: TAILQ_INIT(&files); /* keys from the config file */
1156: preferred = &authctxt->keys;
1157: TAILQ_INIT(preferred); /* preferred order of keys */
1158:
1.190 djm 1159: /* list of keys stored in the filesystem and PKCS#11 */
1.117 markus 1160: for (i = 0; i < options.num_identity_files; i++) {
1161: key = options.identity_keys[i];
1162: if (key && key->type == KEY_RSA1)
1.180 djm 1163: continue;
1164: if (key && key->cert && key->cert->type != SSH2_CERT_TYPE_USER)
1.117 markus 1165: continue;
1166: options.identity_keys[i] = NULL;
1.150 djm 1167: id = xcalloc(1, sizeof(*id));
1.117 markus 1168: id->key = key;
1169: id->filename = xstrdup(options.identity_files[i]);
1.192 dtucker 1170: id->userprovided = options.identity_file_userprovided[i];
1.117 markus 1171: TAILQ_INSERT_TAIL(&files, id, next);
1.190 djm 1172: }
1173: /* Prefer PKCS11 keys that are explicitly listed */
1174: TAILQ_FOREACH_SAFE(id, &files, next, tmp) {
1.209 djm 1175: if (id->key == NULL || (id->key->flags & SSHKEY_FLAG_EXT) == 0)
1.190 djm 1176: continue;
1177: found = 0;
1178: TAILQ_FOREACH(id2, &files, next) {
1179: if (id2->key == NULL ||
1.209 djm 1180: (id2->key->flags & SSHKEY_FLAG_EXT) == 0)
1.190 djm 1181: continue;
1182: if (key_equal(id->key, id2->key)) {
1183: TAILQ_REMOVE(&files, id, next);
1184: TAILQ_INSERT_TAIL(preferred, id, next);
1185: found = 1;
1186: break;
1187: }
1188: }
1189: /* If IdentitiesOnly set and key not found then don't use it */
1190: if (!found && options.identities_only) {
1191: TAILQ_REMOVE(&files, id, next);
1.203 tedu 1192: explicit_bzero(id, sizeof(*id));
1.190 djm 1193: free(id);
1194: }
1.117 markus 1195: }
1196: /* list of keys supported by the agent */
1197: if ((ac = ssh_get_authentication_connection())) {
1198: for (key = ssh_get_first_identity(ac, &comment, 2);
1199: key != NULL;
1200: key = ssh_get_next_identity(ac, &comment, 2)) {
1201: found = 0;
1202: TAILQ_FOREACH(id, &files, next) {
1.133 djm 1203: /* agent keys from the config file are preferred */
1.117 markus 1204: if (key_equal(key, id->key)) {
1205: key_free(key);
1.197 djm 1206: free(comment);
1.117 markus 1207: TAILQ_REMOVE(&files, id, next);
1208: TAILQ_INSERT_TAIL(preferred, id, next);
1209: id->ac = ac;
1210: found = 1;
1211: break;
1212: }
1213: }
1.135 markus 1214: if (!found && !options.identities_only) {
1.150 djm 1215: id = xcalloc(1, sizeof(*id));
1.117 markus 1216: id->key = key;
1217: id->filename = comment;
1218: id->ac = ac;
1219: TAILQ_INSERT_TAIL(&agent, id, next);
1220: }
1221: }
1222: /* append remaining agent keys */
1223: for (id = TAILQ_FIRST(&agent); id; id = TAILQ_FIRST(&agent)) {
1224: TAILQ_REMOVE(&agent, id, next);
1225: TAILQ_INSERT_TAIL(preferred, id, next);
1226: }
1227: authctxt->agent = ac;
1228: }
1229: /* append remaining keys from the config file */
1230: for (id = TAILQ_FIRST(&files); id; id = TAILQ_FIRST(&files)) {
1231: TAILQ_REMOVE(&files, id, next);
1232: TAILQ_INSERT_TAIL(preferred, id, next);
1233: }
1234: TAILQ_FOREACH(id, preferred, next) {
1.191 dtucker 1235: debug2("key: %s (%p),%s", id->filename, id->key,
1236: id->userprovided ? " explicit" : "");
1.117 markus 1237: }
1.17 markus 1238: }
1239:
1.117 markus 1240: static void
1241: pubkey_cleanup(Authctxt *authctxt)
1.51 markus 1242: {
1.117 markus 1243: Identity *id;
1.51 markus 1244:
1.117 markus 1245: if (authctxt->agent != NULL)
1246: ssh_close_authentication_connection(authctxt->agent);
1247: for (id = TAILQ_FIRST(&authctxt->keys); id;
1248: id = TAILQ_FIRST(&authctxt->keys)) {
1249: TAILQ_REMOVE(&authctxt->keys, id, next);
1250: if (id->key)
1251: key_free(id->key);
1.197 djm 1252: free(id->filename);
1253: free(id);
1.117 markus 1254: }
1.1 markus 1255: }
1256:
1.20 markus 1257: int
1258: userauth_pubkey(Authctxt *authctxt)
1259: {
1.117 markus 1260: Identity *id;
1.20 markus 1261: int sent = 0;
1262:
1.117 markus 1263: while ((id = TAILQ_FIRST(&authctxt->keys))) {
1264: if (id->tried++)
1265: return (0);
1.127 markus 1266: /* move key to the end of the queue */
1.117 markus 1267: TAILQ_REMOVE(&authctxt->keys, id, next);
1268: TAILQ_INSERT_TAIL(&authctxt->keys, id, next);
1269: /*
1270: * send a test message if we have the public key. for
1271: * encrypted keys we cannot do this and have to load the
1272: * private key instead
1273: */
1.200 djm 1274: if (id->key != NULL) {
1275: if (key_type_plain(id->key->type) == KEY_RSA &&
1276: (datafellows & SSH_BUG_RSASIGMD5) != 0) {
1277: debug("Skipped %s key %s for RSA/MD5 server",
1278: key_type(id->key), id->filename);
1279: } else if (id->key->type != KEY_RSA1) {
1280: debug("Offering %s public key: %s",
1281: key_type(id->key), id->filename);
1282: sent = send_pubkey_test(authctxt, id);
1283: }
1284: } else {
1.117 markus 1285: debug("Trying private key: %s", id->filename);
1.191 dtucker 1286: id->key = load_identity_file(id->filename,
1287: id->userprovided);
1.117 markus 1288: if (id->key != NULL) {
1289: id->isprivate = 1;
1.200 djm 1290: if (key_type_plain(id->key->type) == KEY_RSA &&
1291: (datafellows & SSH_BUG_RSASIGMD5) != 0) {
1292: debug("Skipped %s key %s for RSA/MD5 "
1293: "server", key_type(id->key),
1294: id->filename);
1295: } else {
1296: sent = sign_and_send_pubkey(
1297: authctxt, id);
1298: }
1.117 markus 1299: key_free(id->key);
1300: id->key = NULL;
1.51 markus 1301: }
1302: }
1.117 markus 1303: if (sent)
1304: return (sent);
1.28 markus 1305: }
1.117 markus 1306: return (0);
1.20 markus 1307: }
1308:
1.23 markus 1309: /*
1310: * Send userauth request message specifying keyboard-interactive method.
1311: */
1312: int
1313: userauth_kbdint(Authctxt *authctxt)
1314: {
1315: static int attempt = 0;
1316:
1317: if (attempt++ >= options.number_of_password_prompts)
1318: return 0;
1.82 markus 1319: /* disable if no SSH2_MSG_USERAUTH_INFO_REQUEST has been seen */
1320: if (attempt > 1 && !authctxt->info_req_seen) {
1321: debug3("userauth_kbdint: disable: no info_req_seen");
1322: dispatch_set(SSH2_MSG_USERAUTH_INFO_REQUEST, NULL);
1323: return 0;
1324: }
1.23 markus 1325:
1326: debug2("userauth_kbdint");
1327: packet_start(SSH2_MSG_USERAUTH_REQUEST);
1328: packet_put_cstring(authctxt->server_user);
1329: packet_put_cstring(authctxt->service);
1330: packet_put_cstring(authctxt->method->name);
1331: packet_put_cstring(""); /* lang */
1332: packet_put_cstring(options.kbd_interactive_devices ?
1333: options.kbd_interactive_devices : "");
1334: packet_send();
1335:
1336: dispatch_set(SSH2_MSG_USERAUTH_INFO_REQUEST, &input_userauth_info_req);
1337: return 1;
1338: }
1339:
1340: /*
1.46 markus 1341: * parse INFO_REQUEST, prompt user and send INFO_RESPONSE
1.23 markus 1342: */
1343: void
1.92 markus 1344: input_userauth_info_req(int type, u_int32_t seq, void *ctxt)
1.23 markus 1345: {
1346: Authctxt *authctxt = ctxt;
1.46 markus 1347: char *name, *inst, *lang, *prompt, *response;
1.32 markus 1348: u_int num_prompts, i;
1.23 markus 1349: int echo = 0;
1350:
1351: debug2("input_userauth_info_req");
1352:
1353: if (authctxt == NULL)
1354: fatal("input_userauth_info_req: no authentication context");
1.82 markus 1355:
1356: authctxt->info_req_seen = 1;
1.23 markus 1357:
1358: name = packet_get_string(NULL);
1359: inst = packet_get_string(NULL);
1360: lang = packet_get_string(NULL);
1361: if (strlen(name) > 0)
1.116 itojun 1362: logit("%s", name);
1.23 markus 1363: if (strlen(inst) > 0)
1.116 itojun 1364: logit("%s", inst);
1.197 djm 1365: free(name);
1366: free(inst);
1367: free(lang);
1.23 markus 1368:
1369: num_prompts = packet_get_int();
1370: /*
1371: * Begin to build info response packet based on prompts requested.
1372: * We commit to providing the correct number of responses, so if
1373: * further on we run into a problem that prevents this, we have to
1374: * be sure and clean this up and send a correct error response.
1375: */
1376: packet_start(SSH2_MSG_USERAUTH_INFO_RESPONSE);
1377: packet_put_int(num_prompts);
1378:
1.73 markus 1379: debug2("input_userauth_info_req: num_prompts %d", num_prompts);
1.23 markus 1380: for (i = 0; i < num_prompts; i++) {
1381: prompt = packet_get_string(NULL);
1382: echo = packet_get_char();
1383:
1.77 markus 1384: response = read_passphrase(prompt, echo ? RP_ECHO : 0);
1.23 markus 1385:
1.49 markus 1386: packet_put_cstring(response);
1.204 djm 1387: explicit_bzero(response, strlen(response));
1.197 djm 1388: free(response);
1389: free(prompt);
1.23 markus 1390: }
1.90 markus 1391: packet_check_eom(); /* done with parsing incoming message. */
1.23 markus 1392:
1.85 markus 1393: packet_add_padding(64);
1.23 markus 1394: packet_send();
1.68 markus 1395: }
1396:
1.100 markus 1397: static int
1.105 deraadt 1398: ssh_keysign(Key *key, u_char **sigp, u_int *lenp,
1.100 markus 1399: u_char *data, u_int datalen)
1400: {
1401: Buffer b;
1.101 markus 1402: struct stat st;
1.100 markus 1403: pid_t pid;
1.103 markus 1404: int to[2], from[2], status, version = 2;
1.100 markus 1405:
1.109 markus 1406: debug2("ssh_keysign called");
1.100 markus 1407:
1.101 markus 1408: if (stat(_PATH_SSH_KEY_SIGN, &st) < 0) {
1.179 dtucker 1409: error("ssh_keysign: not installed: %s", strerror(errno));
1.101 markus 1410: return -1;
1411: }
1.100 markus 1412: if (fflush(stdout) != 0)
1413: error("ssh_keysign: fflush: %s", strerror(errno));
1414: if (pipe(to) < 0) {
1415: error("ssh_keysign: pipe: %s", strerror(errno));
1416: return -1;
1417: }
1418: if (pipe(from) < 0) {
1419: error("ssh_keysign: pipe: %s", strerror(errno));
1420: return -1;
1421: }
1422: if ((pid = fork()) < 0) {
1423: error("ssh_keysign: fork: %s", strerror(errno));
1424: return -1;
1425: }
1426: if (pid == 0) {
1.174 dtucker 1427: /* keep the socket on exec */
1428: fcntl(packet_get_connection_in(), F_SETFD, 0);
1.155 markus 1429: permanently_drop_suid(getuid());
1.100 markus 1430: close(from[0]);
1431: if (dup2(from[1], STDOUT_FILENO) < 0)
1432: fatal("ssh_keysign: dup2: %s", strerror(errno));
1433: close(to[1]);
1434: if (dup2(to[0], STDIN_FILENO) < 0)
1435: fatal("ssh_keysign: dup2: %s", strerror(errno));
1.103 markus 1436: close(from[1]);
1437: close(to[0]);
1.102 markus 1438: execl(_PATH_SSH_KEY_SIGN, _PATH_SSH_KEY_SIGN, (char *) 0);
1.100 markus 1439: fatal("ssh_keysign: exec(%s): %s", _PATH_SSH_KEY_SIGN,
1440: strerror(errno));
1441: }
1442: close(from[1]);
1443: close(to[0]);
1444:
1445: buffer_init(&b);
1.103 markus 1446: buffer_put_int(&b, packet_get_connection_in()); /* send # of socket */
1.100 markus 1447: buffer_put_string(&b, data, datalen);
1.131 djm 1448: if (ssh_msg_send(to[1], version, &b) == -1)
1449: fatal("ssh_keysign: couldn't send request");
1.100 markus 1450:
1.110 djm 1451: if (ssh_msg_recv(from[0], &b) < 0) {
1.101 markus 1452: error("ssh_keysign: no reply");
1.134 markus 1453: buffer_free(&b);
1.100 markus 1454: return -1;
1455: }
1.101 markus 1456: close(from[0]);
1457: close(to[1]);
1458:
1.103 markus 1459: while (waitpid(pid, &status, 0) < 0)
1460: if (errno != EINTR)
1461: break;
1.101 markus 1462:
1.100 markus 1463: if (buffer_get_char(&b) != version) {
1.101 markus 1464: error("ssh_keysign: bad version");
1.134 markus 1465: buffer_free(&b);
1.100 markus 1466: return -1;
1467: }
1468: *sigp = buffer_get_string(&b, lenp);
1.134 markus 1469: buffer_free(&b);
1.100 markus 1470:
1471: return 0;
1472: }
1473:
1.68 markus 1474: int
1475: userauth_hostbased(Authctxt *authctxt)
1476: {
1477: Key *private = NULL;
1.100 markus 1478: Sensitive *sensitive = authctxt->sensitive;
1.68 markus 1479: Buffer b;
1480: u_char *signature, *blob;
1.179 dtucker 1481: char *chost, *pkalg, *p;
1.72 markus 1482: const char *service;
1.68 markus 1483: u_int blen, slen;
1.176 dtucker 1484: int ok, i, found = 0;
1.213 ! djm 1485:
! 1486: /* XXX provide some way to allow user to specify key types attempted */
1.68 markus 1487:
1488: /* check for a useful key */
1.100 markus 1489: for (i = 0; i < sensitive->nkeys; i++) {
1490: private = sensitive->keys[i];
1.68 markus 1491: if (private && private->type != KEY_RSA1) {
1492: found = 1;
1493: /* we take and free the key */
1.100 markus 1494: sensitive->keys[i] = NULL;
1.68 markus 1495: break;
1496: }
1497: }
1498: if (!found) {
1.109 markus 1499: debug("No more client hostkeys for hostbased authentication.");
1.68 markus 1500: return 0;
1501: }
1.211 djm 1502:
1503: debug("%s: trying hostkey type %s", __func__, key_type(private));
1504:
1.68 markus 1505: if (key_to_blob(private, &blob, &blen) == 0) {
1506: key_free(private);
1507: return 0;
1508: }
1.211 djm 1509:
1.84 markus 1510: /* figure out a name for the client host */
1.179 dtucker 1511: p = get_local_name(packet_get_connection_in());
1.84 markus 1512: if (p == NULL) {
1513: error("userauth_hostbased: cannot get local ipaddr/name");
1514: key_free(private);
1.197 djm 1515: free(blob);
1.84 markus 1516: return 0;
1517: }
1.150 djm 1518: xasprintf(&chost, "%s.", p);
1.84 markus 1519: debug2("userauth_hostbased: chost %s", chost);
1.197 djm 1520: free(p);
1.84 markus 1521:
1.72 markus 1522: service = datafellows & SSH_BUG_HBSERVICE ? "ssh-userauth" :
1523: authctxt->service;
1.68 markus 1524: pkalg = xstrdup(key_ssh_name(private));
1525: buffer_init(&b);
1526: /* construct data */
1.72 markus 1527: buffer_put_string(&b, session_id2, session_id2_len);
1.68 markus 1528: buffer_put_char(&b, SSH2_MSG_USERAUTH_REQUEST);
1529: buffer_put_cstring(&b, authctxt->server_user);
1.72 markus 1530: buffer_put_cstring(&b, service);
1.68 markus 1531: buffer_put_cstring(&b, authctxt->method->name);
1532: buffer_put_cstring(&b, pkalg);
1533: buffer_put_string(&b, blob, blen);
1534: buffer_put_cstring(&b, chost);
1535: buffer_put_cstring(&b, authctxt->local_user);
1536: #ifdef DEBUG_PK
1537: buffer_dump(&b);
1538: #endif
1.100 markus 1539: if (sensitive->external_keysign)
1540: ok = ssh_keysign(private, &signature, &slen,
1541: buffer_ptr(&b), buffer_len(&b));
1542: else
1543: ok = key_sign(private, &signature, &slen,
1544: buffer_ptr(&b), buffer_len(&b));
1.68 markus 1545: key_free(private);
1546: buffer_free(&b);
1547: if (ok != 0) {
1548: error("key_sign failed");
1.197 djm 1549: free(chost);
1550: free(pkalg);
1551: free(blob);
1.68 markus 1552: return 0;
1553: }
1554: packet_start(SSH2_MSG_USERAUTH_REQUEST);
1555: packet_put_cstring(authctxt->server_user);
1556: packet_put_cstring(authctxt->service);
1557: packet_put_cstring(authctxt->method->name);
1558: packet_put_cstring(pkalg);
1559: packet_put_string(blob, blen);
1560: packet_put_cstring(chost);
1561: packet_put_cstring(authctxt->local_user);
1562: packet_put_string(signature, slen);
1.204 djm 1563: explicit_bzero(signature, slen);
1.197 djm 1564: free(signature);
1565: free(chost);
1566: free(pkalg);
1567: free(blob);
1.68 markus 1568:
1569: packet_send();
1570: return 1;
1.23 markus 1571: }
1.170 djm 1572:
1.20 markus 1573: /* find auth method */
1574:
1575: /*
1576: * given auth method name, if configurable options permit this method fill
1577: * in auth_ident field and return true, otherwise return false.
1578: */
1.76 itojun 1579: static int
1.20 markus 1580: authmethod_is_enabled(Authmethod *method)
1581: {
1582: if (method == NULL)
1583: return 0;
1584: /* return false if options indicate this method is disabled */
1585: if (method->enabled == NULL || *method->enabled == 0)
1586: return 0;
1587: /* return false if batch mode is enabled but method needs interactive mode */
1588: if (method->batch_flag != NULL && *method->batch_flag != 0)
1589: return 0;
1590: return 1;
1591: }
1592:
1.76 itojun 1593: static Authmethod *
1.20 markus 1594: authmethod_lookup(const char *name)
1.1 markus 1595: {
1.20 markus 1596: Authmethod *method = NULL;
1597: if (name != NULL)
1598: for (method = authmethods; method->name != NULL; method++)
1599: if (strcmp(name, method->name) == 0)
1600: return method;
1601: debug2("Unrecognized authentication method name: %s", name ? name : "NULL");
1602: return NULL;
1603: }
1.1 markus 1604:
1.53 markus 1605: /* XXX internal state */
1606: static Authmethod *current = NULL;
1607: static char *supported = NULL;
1608: static char *preferred = NULL;
1.105 deraadt 1609:
1.20 markus 1610: /*
1611: * Given the authentication method list sent by the server, return the
1612: * next method we should try. If the server initially sends a nil list,
1.67 markus 1613: * use a built-in default list.
1.41 stevesk 1614: */
1.76 itojun 1615: static Authmethod *
1.20 markus 1616: authmethod_get(char *authlist)
1617: {
1.53 markus 1618: char *name = NULL;
1.97 markus 1619: u_int next;
1.41 stevesk 1620:
1.20 markus 1621: /* Use a suitable default if we're passed a nil list. */
1622: if (authlist == NULL || strlen(authlist) == 0)
1.53 markus 1623: authlist = options.preferred_authentications;
1.20 markus 1624:
1.53 markus 1625: if (supported == NULL || strcmp(authlist, supported) != 0) {
1626: debug3("start over, passed a different list %s", authlist);
1.197 djm 1627: free(supported);
1.53 markus 1628: supported = xstrdup(authlist);
1629: preferred = options.preferred_authentications;
1630: debug3("preferred %s", preferred);
1631: current = NULL;
1632: } else if (current != NULL && authmethod_is_enabled(current))
1633: return current;
1.20 markus 1634:
1.53 markus 1635: for (;;) {
1636: if ((name = match_list(preferred, supported, &next)) == NULL) {
1.109 markus 1637: debug("No more authentication methods to try.");
1.53 markus 1638: current = NULL;
1639: return NULL;
1640: }
1641: preferred += next;
1.23 markus 1642: debug3("authmethod_lookup %s", name);
1.53 markus 1643: debug3("remaining preferred: %s", preferred);
1644: if ((current = authmethod_lookup(name)) != NULL &&
1645: authmethod_is_enabled(current)) {
1.23 markus 1646: debug3("authmethod_is_enabled %s", name);
1.109 markus 1647: debug("Next authentication method: %s", name);
1.197 djm 1648: free(name);
1.53 markus 1649: return current;
1.23 markus 1650: }
1.198 dtucker 1651: free(name);
1.1 markus 1652: }
1.53 markus 1653: }
1.1 markus 1654:
1.79 stevesk 1655: static char *
1.53 markus 1656: authmethods_get(void)
1657: {
1658: Authmethod *method = NULL;
1.93 markus 1659: Buffer b;
1660: char *list;
1.27 provos 1661:
1.93 markus 1662: buffer_init(&b);
1.53 markus 1663: for (method = authmethods; method->name != NULL; method++) {
1664: if (authmethod_is_enabled(method)) {
1.93 markus 1665: if (buffer_len(&b) > 0)
1666: buffer_append(&b, ",", 1);
1667: buffer_append(&b, method->name, strlen(method->name));
1.53 markus 1668: }
1669: }
1.93 markus 1670: buffer_append(&b, "\0", 1);
1671: list = xstrdup(buffer_ptr(&b));
1672: buffer_free(&b);
1673: return list;
1.1 markus 1674: }
1.170 djm 1675:
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