Annotation of src/usr.bin/ssh/sshconnect2.c, Revision 1.217
1.217 ! markus 1: /* $OpenBSD: sshconnect2.c,v 1.216 2015/01/18 13:33:34 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"
1.214 djm 67: #include "ssherr.h"
1.22 provos 68:
1.121 markus 69: #ifdef GSSAPI
70: #include "ssh-gss.h"
71: #endif
72:
1.1 markus 73: /* import */
74: extern char *client_version_string;
75: extern char *server_version_string;
76: extern Options options;
77:
78: /*
79: * SSH2 key exchange
80: */
81:
1.32 markus 82: u_char *session_id2 = NULL;
1.120 markus 83: u_int session_id2_len = 0;
1.1 markus 84:
1.61 markus 85: char *xxx_host;
86: struct sockaddr *xxx_hostaddr;
87:
1.76 itojun 88: static int
1.75 markus 89: verify_host_key_callback(Key *hostkey)
1.61 markus 90: {
1.75 markus 91: if (verify_host_key(xxx_host, xxx_hostaddr, hostkey) == -1)
1.83 markus 92: fatal("Host key verification failed.");
1.61 markus 93: return 0;
94: }
95:
1.186 djm 96: static char *
97: order_hostkeyalgs(char *host, struct sockaddr *hostaddr, u_short port)
98: {
99: char *oavail, *avail, *first, *last, *alg, *hostname, *ret;
100: size_t maxlen;
101: struct hostkeys *hostkeys;
102: int ktype;
1.188 djm 103: u_int i;
1.186 djm 104:
105: /* Find all hostkeys for this hostname */
106: get_hostfile_hostname_ipaddr(host, hostaddr, port, &hostname, NULL);
107: hostkeys = init_hostkeys();
1.188 djm 108: for (i = 0; i < options.num_user_hostfiles; i++)
109: load_hostkeys(hostkeys, hostname, options.user_hostfiles[i]);
110: for (i = 0; i < options.num_system_hostfiles; i++)
111: load_hostkeys(hostkeys, hostname, options.system_hostfiles[i]);
1.186 djm 112:
113: oavail = avail = xstrdup(KEX_DEFAULT_PK_ALG);
114: maxlen = strlen(avail) + 1;
115: first = xmalloc(maxlen);
116: last = xmalloc(maxlen);
117: *first = *last = '\0';
118:
119: #define ALG_APPEND(to, from) \
120: do { \
121: if (*to != '\0') \
122: strlcat(to, ",", maxlen); \
123: strlcat(to, from, maxlen); \
124: } while (0)
125:
126: while ((alg = strsep(&avail, ",")) && *alg != '\0') {
1.214 djm 127: if ((ktype = sshkey_type_from_name(alg)) == KEY_UNSPEC)
1.186 djm 128: fatal("%s: unknown alg %s", __func__, alg);
129: if (lookup_key_in_hostkeys_by_type(hostkeys,
1.214 djm 130: sshkey_type_plain(ktype), NULL))
1.186 djm 131: ALG_APPEND(first, alg);
132: else
133: ALG_APPEND(last, alg);
134: }
135: #undef ALG_APPEND
1.216 djm 136: xasprintf(&ret, "%s%s%s", first,
137: (*first == '\0' || *last == '\0') ? "" : ",", last);
1.186 djm 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);
1.217 ! markus 202: active_state->kex = kex;
1.207 markus 203: #ifdef WITH_OPENSSL
1.111 markus 204: kex->kex[KEX_DH_GRP1_SHA1] = kexdh_client;
1.138 djm 205: kex->kex[KEX_DH_GRP14_SHA1] = kexdh_client;
1.111 markus 206: kex->kex[KEX_DH_GEX_SHA1] = kexgex_client;
1.147 djm 207: kex->kex[KEX_DH_GEX_SHA256] = kexgex_client;
1.184 djm 208: kex->kex[KEX_ECDH_SHA2] = kexecdh_client;
1.207 markus 209: #endif
1.199 markus 210: kex->kex[KEX_C25519_SHA256] = kexc25519_client;
1.61 markus 211: kex->client_version_string=client_version_string;
212: kex->server_version_string=server_version_string;
1.75 markus 213: kex->verify_host_key=&verify_host_key_callback;
1.22 provos 214:
1.66 markus 215: dispatch_run(DISPATCH_BLOCK, &kex->done, kex);
1.173 andreas 216:
217: if (options.use_roaming && !kex->roaming) {
218: debug("Roaming not allowed by server");
219: options.use_roaming = 0;
220: }
1.62 markus 221:
222: session_id2 = kex->session_id;
223: session_id2_len = kex->session_id_len;
1.22 provos 224:
225: #ifdef DEBUG_KEXDH
226: /* send 1st encrypted/maced/compressed message */
227: packet_start(SSH2_MSG_IGNORE);
228: packet_put_cstring("markus");
229: packet_send();
230: packet_write_wait();
231: #endif
1.1 markus 232: }
1.11 markus 233:
1.1 markus 234: /*
235: * Authenticate user
236: */
1.20 markus 237:
1.214 djm 238: typedef struct cauthctxt Authctxt;
239: typedef struct cauthmethod Authmethod;
1.117 markus 240: typedef struct identity Identity;
241: typedef struct idlist Idlist;
1.20 markus 242:
1.117 markus 243: struct identity {
244: TAILQ_ENTRY(identity) next;
1.214 djm 245: int agent_fd; /* >=0 if agent supports key */
246: struct sshkey *key; /* public/private key */
1.117 markus 247: char *filename; /* comment for agent-only keys */
248: int tried;
249: int isprivate; /* key points to the private key */
1.191 dtucker 250: int userprovided;
1.117 markus 251: };
252: TAILQ_HEAD(idlist, identity);
1.20 markus 253:
1.214 djm 254: struct cauthctxt {
1.20 markus 255: const char *server_user;
1.68 markus 256: const char *local_user;
1.20 markus 257: const char *host;
258: const char *service;
1.214 djm 259: struct cauthmethod *method;
1.183 djm 260: sig_atomic_t success;
1.51 markus 261: char *authlist;
1.214 djm 262: int attempt;
1.68 markus 263: /* pubkey */
1.214 djm 264: struct idlist keys;
265: int agent_fd;
1.68 markus 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: };
1.214 djm 273:
274: struct cauthmethod {
1.20 markus 275: char *name; /* string to compare against server's list */
276: int (*userauth)(Authctxt *authctxt);
1.170 djm 277: void (*cleanup)(Authctxt *authctxt);
1.20 markus 278: int *enabled; /* flag in option struct that enables method */
279: int *batch_flag; /* flag in option struct that disables method */
280: };
281:
1.92 markus 282: void input_userauth_success(int, u_int32_t, void *);
1.172 djm 283: void input_userauth_success_unexpected(int, u_int32_t, void *);
1.92 markus 284: void input_userauth_failure(int, u_int32_t, void *);
285: void input_userauth_banner(int, u_int32_t, void *);
286: void input_userauth_error(int, u_int32_t, void *);
287: void input_userauth_info_req(int, u_int32_t, void *);
288: void input_userauth_pk_ok(int, u_int32_t, void *);
1.99 markus 289: void input_userauth_passwd_changereq(int, u_int32_t, void *);
1.86 itojun 290:
291: int userauth_none(Authctxt *);
292: int userauth_pubkey(Authctxt *);
293: int userauth_passwd(Authctxt *);
294: int userauth_kbdint(Authctxt *);
295: int userauth_hostbased(Authctxt *);
1.20 markus 296:
1.121 markus 297: #ifdef GSSAPI
298: int userauth_gssapi(Authctxt *authctxt);
299: void input_gssapi_response(int type, u_int32_t, void *);
300: void input_gssapi_token(int type, u_int32_t, void *);
301: void input_gssapi_hash(int type, u_int32_t, void *);
302: void input_gssapi_error(int, u_int32_t, void *);
303: void input_gssapi_errtok(int, u_int32_t, void *);
304: #endif
305:
1.86 itojun 306: void userauth(Authctxt *, char *);
1.51 markus 307:
1.117 markus 308: static int sign_and_send_pubkey(Authctxt *, Identity *);
309: static void pubkey_prepare(Authctxt *);
310: static void pubkey_cleanup(Authctxt *);
1.191 dtucker 311: static Key *load_identity_file(char *, int);
1.76 itojun 312:
313: static Authmethod *authmethod_get(char *authlist);
314: static Authmethod *authmethod_lookup(const char *name);
315: static char *authmethods_get(void);
1.20 markus 316:
317: Authmethod authmethods[] = {
1.121 markus 318: #ifdef GSSAPI
1.132 markus 319: {"gssapi-with-mic",
1.121 markus 320: userauth_gssapi,
1.170 djm 321: NULL,
1.121 markus 322: &options.gss_authentication,
323: NULL},
324: #endif
1.81 markus 325: {"hostbased",
326: userauth_hostbased,
1.170 djm 327: NULL,
1.81 markus 328: &options.hostbased_authentication,
329: NULL},
1.20 markus 330: {"publickey",
331: userauth_pubkey,
1.170 djm 332: NULL,
1.28 markus 333: &options.pubkey_authentication,
1.20 markus 334: NULL},
1.81 markus 335: {"keyboard-interactive",
336: userauth_kbdint,
1.170 djm 337: NULL,
1.81 markus 338: &options.kbd_interactive_authentication,
339: &options.batch_mode},
1.20 markus 340: {"password",
341: userauth_passwd,
1.170 djm 342: NULL,
1.20 markus 343: &options.password_authentication,
1.23 markus 344: &options.batch_mode},
345: {"none",
346: userauth_none,
347: NULL,
1.170 djm 348: NULL,
1.23 markus 349: NULL},
1.170 djm 350: {NULL, NULL, NULL, NULL, NULL}
1.20 markus 351: };
352:
353: void
1.68 markus 354: ssh_userauth2(const char *local_user, const char *server_user, char *host,
1.100 markus 355: Sensitive *sensitive)
1.20 markus 356: {
357: Authctxt authctxt;
358: int type;
1.39 markus 359:
1.73 markus 360: if (options.challenge_response_authentication)
1.39 markus 361: options.kbd_interactive_authentication = 1;
1.20 markus 362:
363: packet_start(SSH2_MSG_SERVICE_REQUEST);
364: packet_put_cstring("ssh-userauth");
365: packet_send();
1.108 markus 366: debug("SSH2_MSG_SERVICE_REQUEST sent");
1.20 markus 367: packet_write_wait();
1.91 markus 368: type = packet_read();
1.108 markus 369: if (type != SSH2_MSG_SERVICE_ACCEPT)
370: fatal("Server denied authentication request: %d", type);
1.20 markus 371: if (packet_remaining() > 0) {
1.91 markus 372: char *reply = packet_get_string(NULL);
1.108 markus 373: debug2("service_accept: %s", reply);
1.197 djm 374: free(reply);
1.20 markus 375: } else {
1.109 markus 376: debug2("buggy server: service_accept w/o service");
1.20 markus 377: }
1.90 markus 378: packet_check_eom();
1.108 markus 379: debug("SSH2_MSG_SERVICE_ACCEPT received");
1.20 markus 380:
1.53 markus 381: if (options.preferred_authentications == NULL)
382: options.preferred_authentications = authmethods_get();
383:
1.20 markus 384: /* setup authentication context */
1.82 markus 385: memset(&authctxt, 0, sizeof(authctxt));
1.117 markus 386: pubkey_prepare(&authctxt);
1.20 markus 387: authctxt.server_user = server_user;
1.68 markus 388: authctxt.local_user = local_user;
1.20 markus 389: authctxt.host = host;
390: authctxt.service = "ssh-connection"; /* service name */
391: authctxt.success = 0;
1.23 markus 392: authctxt.method = authmethod_lookup("none");
1.51 markus 393: authctxt.authlist = NULL;
1.121 markus 394: authctxt.methoddata = NULL;
1.100 markus 395: authctxt.sensitive = sensitive;
1.82 markus 396: authctxt.info_req_seen = 0;
1.215 djm 397: authctxt.agent_fd = -1;
1.23 markus 398: if (authctxt.method == NULL)
399: fatal("ssh_userauth2: internal error: cannot send userauth none request");
1.20 markus 400:
401: /* initial userauth request */
1.23 markus 402: userauth_none(&authctxt);
1.20 markus 403:
1.65 markus 404: dispatch_init(&input_userauth_error);
1.20 markus 405: dispatch_set(SSH2_MSG_USERAUTH_SUCCESS, &input_userauth_success);
406: dispatch_set(SSH2_MSG_USERAUTH_FAILURE, &input_userauth_failure);
1.35 markus 407: dispatch_set(SSH2_MSG_USERAUTH_BANNER, &input_userauth_banner);
1.20 markus 408: dispatch_run(DISPATCH_BLOCK, &authctxt.success, &authctxt); /* loop until success */
409:
1.117 markus 410: pubkey_cleanup(&authctxt);
1.119 markus 411: dispatch_range(SSH2_MSG_USERAUTH_MIN, SSH2_MSG_USERAUTH_MAX, NULL);
412:
1.109 markus 413: debug("Authentication succeeded (%s).", authctxt.method->name);
1.20 markus 414: }
1.119 markus 415:
1.20 markus 416: void
1.51 markus 417: userauth(Authctxt *authctxt, char *authlist)
418: {
1.170 djm 419: if (authctxt->method != NULL && authctxt->method->cleanup != NULL)
420: authctxt->method->cleanup(authctxt);
421:
1.197 djm 422: free(authctxt->methoddata);
423: authctxt->methoddata = NULL;
1.51 markus 424: if (authlist == NULL) {
425: authlist = authctxt->authlist;
426: } else {
1.197 djm 427: free(authctxt->authlist);
1.51 markus 428: authctxt->authlist = authlist;
429: }
430: for (;;) {
431: Authmethod *method = authmethod_get(authlist);
432: if (method == NULL)
433: fatal("Permission denied (%s).", authlist);
434: authctxt->method = method;
1.119 markus 435:
436: /* reset the per method handler */
437: dispatch_range(SSH2_MSG_USERAUTH_PER_METHOD_MIN,
438: SSH2_MSG_USERAUTH_PER_METHOD_MAX, NULL);
439:
440: /* and try new method */
1.51 markus 441: if (method->userauth(authctxt) != 0) {
442: debug2("we sent a %s packet, wait for reply", method->name);
443: break;
444: } else {
445: debug2("we did not send a packet, disable method");
446: method->enabled = NULL;
447: }
448: }
449: }
1.105 deraadt 450:
1.169 djm 451: /* ARGSUSED */
1.51 markus 452: void
1.92 markus 453: input_userauth_error(int type, u_int32_t seq, void *ctxt)
1.20 markus 454: {
1.35 markus 455: fatal("input_userauth_error: bad message during authentication: "
1.140 djm 456: "type %d", type);
1.35 markus 457: }
1.105 deraadt 458:
1.169 djm 459: /* ARGSUSED */
1.35 markus 460: void
1.92 markus 461: input_userauth_banner(int type, u_int32_t seq, void *ctxt)
1.35 markus 462: {
1.166 djm 463: char *msg, *raw, *lang;
464: u_int len;
1.126 deraadt 465:
1.35 markus 466: debug3("input_userauth_banner");
1.166 djm 467: raw = packet_get_string(&len);
1.35 markus 468: lang = packet_get_string(NULL);
1.167 markus 469: if (len > 0 && options.log_level >= SYSLOG_LEVEL_INFO) {
1.166 djm 470: if (len > 65536)
471: len = 65536;
1.168 deraadt 472: msg = xmalloc(len * 4 + 1); /* max expansion from strnvis() */
1.177 dtucker 473: strnvis(msg, raw, len * 4 + 1, VIS_SAFE|VIS_OCTAL|VIS_NOSLASH);
1.125 dtucker 474: fprintf(stderr, "%s", msg);
1.197 djm 475: free(msg);
1.166 djm 476: }
1.197 djm 477: free(raw);
478: free(lang);
1.20 markus 479: }
1.105 deraadt 480:
1.169 djm 481: /* ARGSUSED */
1.20 markus 482: void
1.92 markus 483: input_userauth_success(int type, u_int32_t seq, void *ctxt)
1.20 markus 484: {
485: Authctxt *authctxt = ctxt;
1.172 djm 486:
1.20 markus 487: if (authctxt == NULL)
488: fatal("input_userauth_success: no authentication context");
1.197 djm 489: free(authctxt->authlist);
490: authctxt->authlist = NULL;
1.172 djm 491: if (authctxt->method != NULL && authctxt->method->cleanup != NULL)
492: authctxt->method->cleanup(authctxt);
1.197 djm 493: free(authctxt->methoddata);
494: authctxt->methoddata = NULL;
1.20 markus 495: authctxt->success = 1; /* break out */
496: }
1.105 deraadt 497:
1.172 djm 498: void
499: input_userauth_success_unexpected(int type, u_int32_t seq, void *ctxt)
500: {
501: Authctxt *authctxt = ctxt;
502:
503: if (authctxt == NULL)
504: fatal("%s: no authentication context", __func__);
505:
506: fatal("Unexpected authentication success during %s.",
507: authctxt->method->name);
508: }
509:
1.169 djm 510: /* ARGSUSED */
1.20 markus 511: void
1.92 markus 512: input_userauth_failure(int type, u_int32_t seq, void *ctxt)
1.20 markus 513: {
514: Authctxt *authctxt = ctxt;
515: char *authlist = NULL;
516: int partial;
517:
518: if (authctxt == NULL)
519: fatal("input_userauth_failure: no authentication context");
520:
1.23 markus 521: authlist = packet_get_string(NULL);
1.20 markus 522: partial = packet_get_char();
1.90 markus 523: packet_check_eom();
1.20 markus 524:
1.193 markus 525: if (partial != 0) {
1.116 itojun 526: logit("Authenticated with partial success.");
1.193 markus 527: /* reset state */
528: pubkey_cleanup(authctxt);
529: pubkey_prepare(authctxt);
530: }
1.109 markus 531: debug("Authentications that can continue: %s", authlist);
1.20 markus 532:
1.51 markus 533: userauth(authctxt, authlist);
534: }
1.169 djm 535:
536: /* ARGSUSED */
1.51 markus 537: void
1.92 markus 538: input_userauth_pk_ok(int type, u_int32_t seq, void *ctxt)
1.51 markus 539: {
540: Authctxt *authctxt = ctxt;
541: Key *key = NULL;
1.117 markus 542: Identity *id = NULL;
1.51 markus 543: Buffer b;
1.96 markus 544: int pktype, sent = 0;
545: u_int alen, blen;
546: char *pkalg, *fp;
547: u_char *pkblob;
1.51 markus 548:
549: if (authctxt == NULL)
550: fatal("input_userauth_pk_ok: no authentication context");
551: if (datafellows & SSH_BUG_PKOK) {
552: /* this is similar to SSH_BUG_PKAUTH */
553: debug2("input_userauth_pk_ok: SSH_BUG_PKOK");
554: pkblob = packet_get_string(&blen);
555: buffer_init(&b);
556: buffer_append(&b, pkblob, blen);
557: pkalg = buffer_get_string(&b, &alen);
558: buffer_free(&b);
559: } else {
560: pkalg = packet_get_string(&alen);
561: pkblob = packet_get_string(&blen);
562: }
1.90 markus 563: packet_check_eom();
1.51 markus 564:
1.117 markus 565: debug("Server accepts key: pkalg %s blen %u", pkalg, blen);
1.51 markus 566:
1.117 markus 567: if ((pktype = key_type_from_name(pkalg)) == KEY_UNSPEC) {
568: debug("unknown pkalg %s", pkalg);
569: goto done;
570: }
571: if ((key = key_from_blob(pkblob, blen)) == NULL) {
572: debug("no key from blob. pkalg %s", pkalg);
573: goto done;
574: }
575: if (key->type != pktype) {
576: error("input_userauth_pk_ok: type mismatch "
577: "for decoded key (received %d, expected %d)",
578: key->type, pktype);
579: goto done;
580: }
1.214 djm 581: fp = sshkey_fingerprint(key, options.fingerprint_hash, SSH_FP_DEFAULT);
1.117 markus 582: debug2("input_userauth_pk_ok: fp %s", fp);
1.197 djm 583: free(fp);
1.117 markus 584:
1.127 markus 585: /*
586: * search keys in the reverse order, because last candidate has been
587: * moved to the end of the queue. this also avoids confusion by
588: * duplicate keys
589: */
1.136 henning 590: TAILQ_FOREACH_REVERSE(id, &authctxt->keys, idlist, next) {
1.117 markus 591: if (key_equal(key, id->key)) {
592: sent = sign_and_send_pubkey(authctxt, id);
1.51 markus 593: break;
594: }
1.117 markus 595: }
596: done:
1.51 markus 597: if (key != NULL)
598: key_free(key);
1.197 djm 599: free(pkalg);
600: free(pkblob);
1.51 markus 601:
1.106 deraadt 602: /* try another method if we did not send a packet */
1.51 markus 603: if (sent == 0)
604: userauth(authctxt, NULL);
1.20 markus 605: }
1.121 markus 606:
607: #ifdef GSSAPI
1.133 djm 608: int
1.121 markus 609: userauth_gssapi(Authctxt *authctxt)
610: {
611: Gssctxt *gssctxt = NULL;
1.128 avsm 612: static gss_OID_set gss_supported = NULL;
1.139 djm 613: static u_int mech = 0;
1.121 markus 614: OM_uint32 min;
615: int ok = 0;
616:
617: /* Try one GSSAPI method at a time, rather than sending them all at
618: * once. */
619:
1.128 avsm 620: if (gss_supported == NULL)
621: gss_indicate_mechs(&min, &gss_supported);
1.121 markus 622:
623: /* Check to see if the mechanism is usable before we offer it */
1.128 avsm 624: while (mech < gss_supported->count && !ok) {
1.121 markus 625: /* My DER encoding requires length<128 */
1.128 avsm 626: if (gss_supported->elements[mech].length < 128 &&
1.161 djm 627: ssh_gssapi_check_mechanism(&gssctxt,
628: &gss_supported->elements[mech], authctxt->host)) {
1.121 markus 629: ok = 1; /* Mechanism works */
630: } else {
631: mech++;
632: }
633: }
634:
1.161 djm 635: if (!ok)
1.139 djm 636: return 0;
1.121 markus 637:
638: authctxt->methoddata=(void *)gssctxt;
639:
640: packet_start(SSH2_MSG_USERAUTH_REQUEST);
641: packet_put_cstring(authctxt->server_user);
642: packet_put_cstring(authctxt->service);
643: packet_put_cstring(authctxt->method->name);
644:
645: packet_put_int(1);
646:
1.129 markus 647: packet_put_int((gss_supported->elements[mech].length) + 2);
648: packet_put_char(SSH_GSS_OIDTYPE);
649: packet_put_char(gss_supported->elements[mech].length);
650: packet_put_raw(gss_supported->elements[mech].elements,
651: gss_supported->elements[mech].length);
1.121 markus 652:
653: packet_send();
654:
655: dispatch_set(SSH2_MSG_USERAUTH_GSSAPI_RESPONSE, &input_gssapi_response);
656: dispatch_set(SSH2_MSG_USERAUTH_GSSAPI_TOKEN, &input_gssapi_token);
657: dispatch_set(SSH2_MSG_USERAUTH_GSSAPI_ERROR, &input_gssapi_error);
658: dispatch_set(SSH2_MSG_USERAUTH_GSSAPI_ERRTOK, &input_gssapi_errtok);
659:
660: mech++; /* Move along to next candidate */
661:
662: return 1;
663: }
664:
1.130 markus 665: static OM_uint32
666: process_gssapi_token(void *ctxt, gss_buffer_t recv_tok)
667: {
668: Authctxt *authctxt = ctxt;
669: Gssctxt *gssctxt = authctxt->methoddata;
670: gss_buffer_desc send_tok = GSS_C_EMPTY_BUFFER;
1.142 djm 671: gss_buffer_desc mic = GSS_C_EMPTY_BUFFER;
672: gss_buffer_desc gssbuf;
1.132 markus 673: OM_uint32 status, ms, flags;
674: Buffer b;
1.133 djm 675:
1.130 markus 676: status = ssh_gssapi_init_ctx(gssctxt, options.gss_deleg_creds,
1.132 markus 677: recv_tok, &send_tok, &flags);
1.130 markus 678:
679: if (send_tok.length > 0) {
680: if (GSS_ERROR(status))
681: packet_start(SSH2_MSG_USERAUTH_GSSAPI_ERRTOK);
682: else
683: packet_start(SSH2_MSG_USERAUTH_GSSAPI_TOKEN);
1.133 djm 684:
1.130 markus 685: packet_put_string(send_tok.value, send_tok.length);
686: packet_send();
687: gss_release_buffer(&ms, &send_tok);
688: }
1.133 djm 689:
1.130 markus 690: if (status == GSS_S_COMPLETE) {
1.132 markus 691: /* send either complete or MIC, depending on mechanism */
692: if (!(flags & GSS_C_INTEG_FLAG)) {
693: packet_start(SSH2_MSG_USERAUTH_GSSAPI_EXCHANGE_COMPLETE);
694: packet_send();
695: } else {
696: ssh_gssapi_buildmic(&b, authctxt->server_user,
697: authctxt->service, "gssapi-with-mic");
698:
699: gssbuf.value = buffer_ptr(&b);
700: gssbuf.length = buffer_len(&b);
1.133 djm 701:
1.132 markus 702: status = ssh_gssapi_sign(gssctxt, &gssbuf, &mic);
1.133 djm 703:
1.132 markus 704: if (!GSS_ERROR(status)) {
705: packet_start(SSH2_MSG_USERAUTH_GSSAPI_MIC);
706: packet_put_string(mic.value, mic.length);
1.133 djm 707:
1.132 markus 708: packet_send();
709: }
1.133 djm 710:
1.132 markus 711: buffer_free(&b);
712: gss_release_buffer(&ms, &mic);
1.133 djm 713: }
1.130 markus 714: }
1.133 djm 715:
1.130 markus 716: return status;
717: }
718:
1.169 djm 719: /* ARGSUSED */
1.121 markus 720: void
721: input_gssapi_response(int type, u_int32_t plen, void *ctxt)
722: {
723: Authctxt *authctxt = ctxt;
724: Gssctxt *gssctxt;
725: int oidlen;
726: char *oidv;
727:
728: if (authctxt == NULL)
729: fatal("input_gssapi_response: no authentication context");
730: gssctxt = authctxt->methoddata;
731:
732: /* Setup our OID */
733: oidv = packet_get_string(&oidlen);
734:
1.129 markus 735: if (oidlen <= 2 ||
736: oidv[0] != SSH_GSS_OIDTYPE ||
737: oidv[1] != oidlen - 2) {
1.197 djm 738: free(oidv);
1.129 markus 739: debug("Badly encoded mechanism OID received");
740: userauth(authctxt, NULL);
741: return;
1.121 markus 742: }
1.129 markus 743:
744: if (!ssh_gssapi_check_oid(gssctxt, oidv + 2, oidlen - 2))
745: fatal("Server returned different OID than expected");
1.121 markus 746:
747: packet_check_eom();
748:
1.197 djm 749: free(oidv);
1.121 markus 750:
1.130 markus 751: if (GSS_ERROR(process_gssapi_token(ctxt, GSS_C_NO_BUFFER))) {
1.121 markus 752: /* Start again with next method on list */
753: debug("Trying to start again");
754: userauth(authctxt, NULL);
755: return;
756: }
757: }
758:
1.169 djm 759: /* ARGSUSED */
1.121 markus 760: void
761: input_gssapi_token(int type, u_int32_t plen, void *ctxt)
762: {
763: Authctxt *authctxt = ctxt;
764: gss_buffer_desc recv_tok;
1.130 markus 765: OM_uint32 status;
1.121 markus 766: u_int slen;
767:
768: if (authctxt == NULL)
769: fatal("input_gssapi_response: no authentication context");
770:
771: recv_tok.value = packet_get_string(&slen);
772: recv_tok.length = slen; /* safe typecast */
773:
774: packet_check_eom();
775:
1.130 markus 776: status = process_gssapi_token(ctxt, &recv_tok);
1.121 markus 777:
1.197 djm 778: free(recv_tok.value);
1.121 markus 779:
780: if (GSS_ERROR(status)) {
781: /* Start again with the next method in the list */
782: userauth(authctxt, NULL);
783: return;
784: }
785: }
786:
1.169 djm 787: /* ARGSUSED */
1.121 markus 788: void
789: input_gssapi_errtok(int type, u_int32_t plen, void *ctxt)
790: {
791: Authctxt *authctxt = ctxt;
792: Gssctxt *gssctxt;
793: gss_buffer_desc send_tok = GSS_C_EMPTY_BUFFER;
794: gss_buffer_desc recv_tok;
1.194 djm 795: OM_uint32 ms;
1.123 deraadt 796: u_int len;
1.121 markus 797:
798: if (authctxt == NULL)
799: fatal("input_gssapi_response: no authentication context");
800: gssctxt = authctxt->methoddata;
801:
1.123 deraadt 802: recv_tok.value = packet_get_string(&len);
803: recv_tok.length = len;
1.121 markus 804:
805: packet_check_eom();
806:
807: /* Stick it into GSSAPI and see what it says */
1.194 djm 808: (void)ssh_gssapi_init_ctx(gssctxt, options.gss_deleg_creds,
1.140 djm 809: &recv_tok, &send_tok, NULL);
1.121 markus 810:
1.197 djm 811: free(recv_tok.value);
1.121 markus 812: gss_release_buffer(&ms, &send_tok);
813:
814: /* Server will be returning a failed packet after this one */
815: }
816:
1.169 djm 817: /* ARGSUSED */
1.121 markus 818: void
819: input_gssapi_error(int type, u_int32_t plen, void *ctxt)
820: {
821: char *msg;
822: char *lang;
823:
1.194 djm 824: /* maj */(void)packet_get_int();
825: /* min */(void)packet_get_int();
1.121 markus 826: msg=packet_get_string(NULL);
827: lang=packet_get_string(NULL);
828:
829: packet_check_eom();
830:
1.143 stevesk 831: debug("Server GSSAPI Error:\n%s", msg);
1.197 djm 832: free(msg);
833: free(lang);
1.121 markus 834: }
835: #endif /* GSSAPI */
1.20 markus 836:
1.1 markus 837: int
1.23 markus 838: userauth_none(Authctxt *authctxt)
839: {
840: /* initial userauth request */
841: packet_start(SSH2_MSG_USERAUTH_REQUEST);
842: packet_put_cstring(authctxt->server_user);
843: packet_put_cstring(authctxt->service);
844: packet_put_cstring(authctxt->method->name);
845: packet_send();
846: return 1;
847: }
848:
849: int
1.20 markus 850: userauth_passwd(Authctxt *authctxt)
1.1 markus 851: {
1.6 markus 852: static int attempt = 0;
1.99 markus 853: char prompt[150];
1.1 markus 854: char *password;
1.175 dtucker 855: const char *host = options.host_key_alias ? options.host_key_alias :
856: authctxt->host;
1.6 markus 857:
1.13 todd 858: if (attempt++ >= options.number_of_password_prompts)
1.6 markus 859: return 0;
1.13 todd 860:
1.87 deraadt 861: if (attempt != 1)
1.13 todd 862: error("Permission denied, please try again.");
1.1 markus 863:
1.43 itojun 864: snprintf(prompt, sizeof(prompt), "%.30s@%.128s's password: ",
1.175 dtucker 865: authctxt->server_user, host);
1.1 markus 866: password = read_passphrase(prompt, 0);
867: packet_start(SSH2_MSG_USERAUTH_REQUEST);
1.20 markus 868: packet_put_cstring(authctxt->server_user);
869: packet_put_cstring(authctxt->service);
1.23 markus 870: packet_put_cstring(authctxt->method->name);
1.1 markus 871: packet_put_char(0);
1.49 markus 872: packet_put_cstring(password);
1.204 djm 873: explicit_bzero(password, strlen(password));
1.197 djm 874: free(password);
1.85 markus 875: packet_add_padding(64);
1.1 markus 876: packet_send();
1.99 markus 877:
1.104 deraadt 878: dispatch_set(SSH2_MSG_USERAUTH_PASSWD_CHANGEREQ,
1.99 markus 879: &input_userauth_passwd_changereq);
880:
1.1 markus 881: return 1;
882: }
1.169 djm 883:
1.99 markus 884: /*
885: * parse PASSWD_CHANGEREQ, prompt user and send SSH2_MSG_USERAUTH_REQUEST
886: */
1.169 djm 887: /* ARGSUSED */
1.99 markus 888: void
1.153 djm 889: input_userauth_passwd_changereq(int type, u_int32_t seqnr, void *ctxt)
1.99 markus 890: {
891: Authctxt *authctxt = ctxt;
892: char *info, *lang, *password = NULL, *retype = NULL;
893: char prompt[150];
1.175 dtucker 894: const char *host = options.host_key_alias ? options.host_key_alias :
895: authctxt->host;
1.99 markus 896:
897: debug2("input_userauth_passwd_changereq");
898:
899: if (authctxt == NULL)
900: fatal("input_userauth_passwd_changereq: "
901: "no authentication context");
902:
903: info = packet_get_string(NULL);
904: lang = packet_get_string(NULL);
905: if (strlen(info) > 0)
1.116 itojun 906: logit("%s", info);
1.197 djm 907: free(info);
908: free(lang);
1.99 markus 909: packet_start(SSH2_MSG_USERAUTH_REQUEST);
910: packet_put_cstring(authctxt->server_user);
911: packet_put_cstring(authctxt->service);
912: packet_put_cstring(authctxt->method->name);
913: packet_put_char(1); /* additional info */
1.104 deraadt 914: snprintf(prompt, sizeof(prompt),
1.99 markus 915: "Enter %.30s@%.128s's old password: ",
1.175 dtucker 916: authctxt->server_user, host);
1.99 markus 917: password = read_passphrase(prompt, 0);
918: packet_put_cstring(password);
1.204 djm 919: explicit_bzero(password, strlen(password));
1.197 djm 920: free(password);
1.99 markus 921: password = NULL;
922: while (password == NULL) {
1.104 deraadt 923: snprintf(prompt, sizeof(prompt),
1.99 markus 924: "Enter %.30s@%.128s's new password: ",
1.175 dtucker 925: authctxt->server_user, host);
1.99 markus 926: password = read_passphrase(prompt, RP_ALLOW_EOF);
927: if (password == NULL) {
928: /* bail out */
929: return;
930: }
1.104 deraadt 931: snprintf(prompt, sizeof(prompt),
1.99 markus 932: "Retype %.30s@%.128s's new password: ",
1.175 dtucker 933: authctxt->server_user, host);
1.99 markus 934: retype = read_passphrase(prompt, 0);
935: if (strcmp(password, retype) != 0) {
1.204 djm 936: explicit_bzero(password, strlen(password));
1.197 djm 937: free(password);
1.116 itojun 938: logit("Mismatch; try again, EOF to quit.");
1.99 markus 939: password = NULL;
940: }
1.204 djm 941: explicit_bzero(retype, strlen(retype));
1.197 djm 942: free(retype);
1.99 markus 943: }
944: packet_put_cstring(password);
1.204 djm 945: explicit_bzero(password, strlen(password));
1.197 djm 946: free(password);
1.99 markus 947: packet_add_padding(64);
948: packet_send();
1.104 deraadt 949:
950: dispatch_set(SSH2_MSG_USERAUTH_PASSWD_CHANGEREQ,
1.99 markus 951: &input_userauth_passwd_changereq);
1.117 markus 952: }
953:
954: static int
1.214 djm 955: identity_sign(struct identity *id, u_char **sigp, size_t *lenp,
956: const u_char *data, size_t datalen, u_int compat)
1.117 markus 957: {
958: Key *prv;
959: int ret;
1.99 markus 960:
1.117 markus 961: /* the agent supports this key */
1.214 djm 962: if (id->agent_fd)
963: return ssh_agent_sign(id->agent_fd, id->key, sigp, lenp,
964: data, datalen, compat);
965:
1.117 markus 966: /*
967: * we have already loaded the private key or
968: * the private key is stored in external hardware
969: */
1.209 djm 970: if (id->isprivate || (id->key->flags & SSHKEY_FLAG_EXT))
1.214 djm 971: return (sshkey_sign(id->key, sigp, lenp, data, datalen,
972: compat));
1.117 markus 973: /* load the private key from the file */
1.191 dtucker 974: if ((prv = load_identity_file(id->filename, id->userprovided)) == NULL)
1.214 djm 975: return (-1); /* XXX return decent error code */
976: ret = sshkey_sign(prv, sigp, lenp, data, datalen, compat);
977: sshkey_free(prv);
1.117 markus 978: return (ret);
1.51 markus 979: }
980:
1.76 itojun 981: static int
1.117 markus 982: sign_and_send_pubkey(Authctxt *authctxt, Identity *id)
1.1 markus 983: {
984: Buffer b;
1.32 markus 985: u_char *blob, *signature;
1.214 djm 986: u_int bloblen;
987: size_t slen;
1.120 markus 988: u_int skip = 0;
1.17 markus 989: int ret = -1;
1.23 markus 990: int have_sig = 1;
1.182 djm 991: char *fp;
1.1 markus 992:
1.212 djm 993: fp = key_fingerprint(id->key, options.fingerprint_hash, SSH_FP_DEFAULT);
1.182 djm 994: debug3("sign_and_send_pubkey: %s %s", key_type(id->key), fp);
1.197 djm 995: free(fp);
1.51 markus 996:
1.117 markus 997: if (key_to_blob(id->key, &blob, &bloblen) == 0) {
1.28 markus 998: /* we cannot handle this key */
1.30 markus 999: debug3("sign_and_send_pubkey: cannot handle key");
1.28 markus 1000: return 0;
1001: }
1.1 markus 1002: /* data to be signed */
1003: buffer_init(&b);
1.26 markus 1004: if (datafellows & SSH_OLD_SESSIONID) {
1005: buffer_append(&b, session_id2, session_id2_len);
1.41 stevesk 1006: skip = session_id2_len;
1.26 markus 1007: } else {
1.14 markus 1008: buffer_put_string(&b, session_id2, session_id2_len);
1009: skip = buffer_len(&b);
1010: }
1.1 markus 1011: buffer_put_char(&b, SSH2_MSG_USERAUTH_REQUEST);
1.20 markus 1012: buffer_put_cstring(&b, authctxt->server_user);
1.10 markus 1013: buffer_put_cstring(&b,
1.30 markus 1014: datafellows & SSH_BUG_PKSERVICE ?
1.10 markus 1015: "ssh-userauth" :
1.20 markus 1016: authctxt->service);
1.30 markus 1017: if (datafellows & SSH_BUG_PKAUTH) {
1018: buffer_put_char(&b, have_sig);
1019: } else {
1020: buffer_put_cstring(&b, authctxt->method->name);
1021: buffer_put_char(&b, have_sig);
1.117 markus 1022: buffer_put_cstring(&b, key_ssh_name(id->key));
1.30 markus 1023: }
1.1 markus 1024: buffer_put_string(&b, blob, bloblen);
1025:
1026: /* generate signature */
1.117 markus 1027: ret = identity_sign(id, &signature, &slen,
1.214 djm 1028: buffer_ptr(&b), buffer_len(&b), datafellows);
1029: if (ret != 0) {
1.197 djm 1030: free(blob);
1.17 markus 1031: buffer_free(&b);
1032: return 0;
1033: }
1.28 markus 1034: #ifdef DEBUG_PK
1.1 markus 1035: buffer_dump(&b);
1036: #endif
1.30 markus 1037: if (datafellows & SSH_BUG_PKSERVICE) {
1.10 markus 1038: buffer_clear(&b);
1039: buffer_append(&b, session_id2, session_id2_len);
1.51 markus 1040: skip = session_id2_len;
1.10 markus 1041: buffer_put_char(&b, SSH2_MSG_USERAUTH_REQUEST);
1.20 markus 1042: buffer_put_cstring(&b, authctxt->server_user);
1043: buffer_put_cstring(&b, authctxt->service);
1.23 markus 1044: buffer_put_cstring(&b, authctxt->method->name);
1045: buffer_put_char(&b, have_sig);
1.30 markus 1046: if (!(datafellows & SSH_BUG_PKAUTH))
1.117 markus 1047: buffer_put_cstring(&b, key_ssh_name(id->key));
1.10 markus 1048: buffer_put_string(&b, blob, bloblen);
1049: }
1.197 djm 1050: free(blob);
1.51 markus 1051:
1.1 markus 1052: /* append signature */
1053: buffer_put_string(&b, signature, slen);
1.197 djm 1054: free(signature);
1.1 markus 1055:
1056: /* skip session id and packet type */
1.14 markus 1057: if (buffer_len(&b) < skip + 1)
1.20 markus 1058: fatal("userauth_pubkey: internal error");
1.14 markus 1059: buffer_consume(&b, skip + 1);
1.1 markus 1060:
1061: /* put remaining data from buffer into packet */
1062: packet_start(SSH2_MSG_USERAUTH_REQUEST);
1063: packet_put_raw(buffer_ptr(&b), buffer_len(&b));
1064: buffer_free(&b);
1065: packet_send();
1.17 markus 1066:
1067: return 1;
1.16 markus 1068: }
1069:
1.76 itojun 1070: static int
1.117 markus 1071: send_pubkey_test(Authctxt *authctxt, Identity *id)
1.20 markus 1072: {
1.51 markus 1073: u_char *blob;
1.97 markus 1074: u_int bloblen, have_sig = 0;
1.20 markus 1075:
1.51 markus 1076: debug3("send_pubkey_test");
1.16 markus 1077:
1.117 markus 1078: if (key_to_blob(id->key, &blob, &bloblen) == 0) {
1.51 markus 1079: /* we cannot handle this key */
1080: debug3("send_pubkey_test: cannot handle key");
1.16 markus 1081: return 0;
1082: }
1.51 markus 1083: /* register callback for USERAUTH_PK_OK message */
1084: dispatch_set(SSH2_MSG_USERAUTH_PK_OK, &input_userauth_pk_ok);
1085:
1086: packet_start(SSH2_MSG_USERAUTH_REQUEST);
1087: packet_put_cstring(authctxt->server_user);
1088: packet_put_cstring(authctxt->service);
1089: packet_put_cstring(authctxt->method->name);
1090: packet_put_char(have_sig);
1091: if (!(datafellows & SSH_BUG_PKAUTH))
1.117 markus 1092: packet_put_cstring(key_ssh_name(id->key));
1.51 markus 1093: packet_put_string(blob, bloblen);
1.197 djm 1094: free(blob);
1.51 markus 1095: packet_send();
1096: return 1;
1097: }
1098:
1.76 itojun 1099: static Key *
1.191 dtucker 1100: load_identity_file(char *filename, int userprovided)
1.51 markus 1101: {
1102: Key *private;
1103: char prompt[300], *passphrase;
1.215 djm 1104: int r, perm_ok = 0, quit = 0, i;
1.52 markus 1105: struct stat st;
1.16 markus 1106:
1.52 markus 1107: if (stat(filename, &st) < 0) {
1.191 dtucker 1108: (userprovided ? logit : debug3)("no such identity: %s: %s",
1109: filename, strerror(errno));
1.52 markus 1110: return NULL;
1111: }
1.214 djm 1112: snprintf(prompt, sizeof prompt,
1113: "Enter passphrase for key '%.100s': ", filename);
1114: for (i = 0; i <= options.number_of_password_prompts; i++) {
1115: if (i == 0)
1116: passphrase = "";
1117: else {
1.20 markus 1118: passphrase = read_passphrase(prompt, 0);
1.214 djm 1119: if (*passphrase == '\0') {
1.20 markus 1120: debug2("no passphrase given, try next key");
1.214 djm 1121: free(passphrase);
1122: break;
1123: }
1124: }
1125: switch ((r = sshkey_load_private_type(KEY_UNSPEC, filename,
1126: passphrase, &private, NULL, &perm_ok))) {
1127: case 0:
1128: break;
1129: case SSH_ERR_KEY_WRONG_PASSPHRASE:
1130: if (options.batch_mode) {
1131: quit = 1;
1132: break;
1133: }
1.215 djm 1134: if (i != 0)
1135: debug2("bad passphrase given, try again...");
1.214 djm 1136: break;
1137: case SSH_ERR_SYSTEM_ERROR:
1138: if (errno == ENOENT) {
1139: debug2("Load key \"%s\": %s",
1140: filename, ssh_err(r));
1.51 markus 1141: quit = 1;
1.214 djm 1142: break;
1.20 markus 1143: }
1.214 djm 1144: /* FALLTHROUGH */
1145: default:
1146: error("Load key \"%s\": %s", filename, ssh_err(r));
1147: quit = 1;
1148: break;
1149: }
1150: if (i > 0) {
1.204 djm 1151: explicit_bzero(passphrase, strlen(passphrase));
1.197 djm 1152: free(passphrase);
1.16 markus 1153: }
1.214 djm 1154: if (private != NULL || quit)
1155: break;
1.16 markus 1156: }
1.51 markus 1157: return private;
1158: }
1159:
1.117 markus 1160: /*
1161: * try keys in the following order:
1162: * 1. agent keys that are found in the config file
1163: * 2. other agent keys
1164: * 3. keys that are only listed in the config file
1165: */
1166: static void
1167: pubkey_prepare(Authctxt *authctxt)
1.51 markus 1168: {
1.214 djm 1169: struct identity *id, *id2, *tmp;
1170: struct idlist agent, files, *preferred;
1171: struct sshkey *key;
1172: int agent_fd, i, r, found;
1173: size_t j;
1174: struct ssh_identitylist *idlist;
1.51 markus 1175:
1.117 markus 1176: TAILQ_INIT(&agent); /* keys from the agent */
1177: TAILQ_INIT(&files); /* keys from the config file */
1178: preferred = &authctxt->keys;
1179: TAILQ_INIT(preferred); /* preferred order of keys */
1180:
1.190 djm 1181: /* list of keys stored in the filesystem and PKCS#11 */
1.117 markus 1182: for (i = 0; i < options.num_identity_files; i++) {
1183: key = options.identity_keys[i];
1184: if (key && key->type == KEY_RSA1)
1.180 djm 1185: continue;
1186: if (key && key->cert && key->cert->type != SSH2_CERT_TYPE_USER)
1.117 markus 1187: continue;
1188: options.identity_keys[i] = NULL;
1.150 djm 1189: id = xcalloc(1, sizeof(*id));
1.117 markus 1190: id->key = key;
1191: id->filename = xstrdup(options.identity_files[i]);
1.192 dtucker 1192: id->userprovided = options.identity_file_userprovided[i];
1.117 markus 1193: TAILQ_INSERT_TAIL(&files, id, next);
1.190 djm 1194: }
1195: /* Prefer PKCS11 keys that are explicitly listed */
1196: TAILQ_FOREACH_SAFE(id, &files, next, tmp) {
1.209 djm 1197: if (id->key == NULL || (id->key->flags & SSHKEY_FLAG_EXT) == 0)
1.190 djm 1198: continue;
1199: found = 0;
1200: TAILQ_FOREACH(id2, &files, next) {
1201: if (id2->key == NULL ||
1.209 djm 1202: (id2->key->flags & SSHKEY_FLAG_EXT) == 0)
1.190 djm 1203: continue;
1.214 djm 1204: if (sshkey_equal(id->key, id2->key)) {
1.190 djm 1205: TAILQ_REMOVE(&files, id, next);
1206: TAILQ_INSERT_TAIL(preferred, id, next);
1207: found = 1;
1208: break;
1209: }
1210: }
1211: /* If IdentitiesOnly set and key not found then don't use it */
1212: if (!found && options.identities_only) {
1213: TAILQ_REMOVE(&files, id, next);
1.203 tedu 1214: explicit_bzero(id, sizeof(*id));
1.190 djm 1215: free(id);
1216: }
1.117 markus 1217: }
1218: /* list of keys supported by the agent */
1.214 djm 1219: if ((r = ssh_get_authentication_socket(&agent_fd)) != 0) {
1220: if (r != SSH_ERR_AGENT_NOT_PRESENT)
1221: debug("%s: ssh_get_authentication_socket: %s",
1222: __func__, ssh_err(r));
1223: } else if ((r = ssh_fetch_identitylist(agent_fd, 2, &idlist)) != 0) {
1224: if (r != SSH_ERR_AGENT_NO_IDENTITIES)
1225: debug("%s: ssh_fetch_identitylist: %s",
1226: __func__, ssh_err(r));
1227: } else {
1228: for (j = 0; j < idlist->nkeys; j++) {
1.117 markus 1229: found = 0;
1230: TAILQ_FOREACH(id, &files, next) {
1.214 djm 1231: /*
1232: * agent keys from the config file are
1233: * preferred
1234: */
1235: if (sshkey_equal(idlist->keys[j], id->key)) {
1.117 markus 1236: TAILQ_REMOVE(&files, id, next);
1237: TAILQ_INSERT_TAIL(preferred, id, next);
1.214 djm 1238: id->agent_fd = agent_fd;
1.117 markus 1239: found = 1;
1240: break;
1241: }
1242: }
1.135 markus 1243: if (!found && !options.identities_only) {
1.150 djm 1244: id = xcalloc(1, sizeof(*id));
1.214 djm 1245: /* XXX "steals" key/comment from idlist */
1246: id->key = idlist->keys[j];
1247: id->filename = idlist->comments[j];
1248: idlist->keys[j] = NULL;
1249: idlist->comments[j] = NULL;
1250: id->agent_fd = agent_fd;
1.117 markus 1251: TAILQ_INSERT_TAIL(&agent, id, next);
1252: }
1253: }
1.214 djm 1254: ssh_free_identitylist(idlist);
1.117 markus 1255: /* append remaining agent keys */
1256: for (id = TAILQ_FIRST(&agent); id; id = TAILQ_FIRST(&agent)) {
1257: TAILQ_REMOVE(&agent, id, next);
1258: TAILQ_INSERT_TAIL(preferred, id, next);
1259: }
1.214 djm 1260: authctxt->agent_fd = agent_fd;
1.117 markus 1261: }
1262: /* append remaining keys from the config file */
1263: for (id = TAILQ_FIRST(&files); id; id = TAILQ_FIRST(&files)) {
1264: TAILQ_REMOVE(&files, id, next);
1265: TAILQ_INSERT_TAIL(preferred, id, next);
1266: }
1267: TAILQ_FOREACH(id, preferred, next) {
1.191 dtucker 1268: debug2("key: %s (%p),%s", id->filename, id->key,
1269: id->userprovided ? " explicit" : "");
1.117 markus 1270: }
1.17 markus 1271: }
1272:
1.117 markus 1273: static void
1274: pubkey_cleanup(Authctxt *authctxt)
1.51 markus 1275: {
1.117 markus 1276: Identity *id;
1.51 markus 1277:
1.214 djm 1278: if (authctxt->agent_fd != -1)
1279: ssh_close_authentication_socket(authctxt->agent_fd);
1.117 markus 1280: for (id = TAILQ_FIRST(&authctxt->keys); id;
1281: id = TAILQ_FIRST(&authctxt->keys)) {
1282: TAILQ_REMOVE(&authctxt->keys, id, next);
1283: if (id->key)
1.214 djm 1284: sshkey_free(id->key);
1.197 djm 1285: free(id->filename);
1286: free(id);
1.117 markus 1287: }
1.1 markus 1288: }
1289:
1.20 markus 1290: int
1291: userauth_pubkey(Authctxt *authctxt)
1292: {
1.117 markus 1293: Identity *id;
1.20 markus 1294: int sent = 0;
1295:
1.117 markus 1296: while ((id = TAILQ_FIRST(&authctxt->keys))) {
1297: if (id->tried++)
1298: return (0);
1.127 markus 1299: /* move key to the end of the queue */
1.117 markus 1300: TAILQ_REMOVE(&authctxt->keys, id, next);
1301: TAILQ_INSERT_TAIL(&authctxt->keys, id, next);
1302: /*
1303: * send a test message if we have the public key. for
1304: * encrypted keys we cannot do this and have to load the
1305: * private key instead
1306: */
1.200 djm 1307: if (id->key != NULL) {
1308: if (key_type_plain(id->key->type) == KEY_RSA &&
1309: (datafellows & SSH_BUG_RSASIGMD5) != 0) {
1310: debug("Skipped %s key %s for RSA/MD5 server",
1311: key_type(id->key), id->filename);
1312: } else if (id->key->type != KEY_RSA1) {
1313: debug("Offering %s public key: %s",
1314: key_type(id->key), id->filename);
1315: sent = send_pubkey_test(authctxt, id);
1316: }
1317: } else {
1.117 markus 1318: debug("Trying private key: %s", id->filename);
1.191 dtucker 1319: id->key = load_identity_file(id->filename,
1320: id->userprovided);
1.117 markus 1321: if (id->key != NULL) {
1322: id->isprivate = 1;
1.200 djm 1323: if (key_type_plain(id->key->type) == KEY_RSA &&
1324: (datafellows & SSH_BUG_RSASIGMD5) != 0) {
1325: debug("Skipped %s key %s for RSA/MD5 "
1326: "server", key_type(id->key),
1327: id->filename);
1328: } else {
1329: sent = sign_and_send_pubkey(
1330: authctxt, id);
1331: }
1.117 markus 1332: key_free(id->key);
1333: id->key = NULL;
1.51 markus 1334: }
1335: }
1.117 markus 1336: if (sent)
1337: return (sent);
1.28 markus 1338: }
1.117 markus 1339: return (0);
1.20 markus 1340: }
1341:
1.23 markus 1342: /*
1343: * Send userauth request message specifying keyboard-interactive method.
1344: */
1345: int
1346: userauth_kbdint(Authctxt *authctxt)
1347: {
1348: static int attempt = 0;
1349:
1350: if (attempt++ >= options.number_of_password_prompts)
1351: return 0;
1.82 markus 1352: /* disable if no SSH2_MSG_USERAUTH_INFO_REQUEST has been seen */
1353: if (attempt > 1 && !authctxt->info_req_seen) {
1354: debug3("userauth_kbdint: disable: no info_req_seen");
1355: dispatch_set(SSH2_MSG_USERAUTH_INFO_REQUEST, NULL);
1356: return 0;
1357: }
1.23 markus 1358:
1359: debug2("userauth_kbdint");
1360: packet_start(SSH2_MSG_USERAUTH_REQUEST);
1361: packet_put_cstring(authctxt->server_user);
1362: packet_put_cstring(authctxt->service);
1363: packet_put_cstring(authctxt->method->name);
1364: packet_put_cstring(""); /* lang */
1365: packet_put_cstring(options.kbd_interactive_devices ?
1366: options.kbd_interactive_devices : "");
1367: packet_send();
1368:
1369: dispatch_set(SSH2_MSG_USERAUTH_INFO_REQUEST, &input_userauth_info_req);
1370: return 1;
1371: }
1372:
1373: /*
1.46 markus 1374: * parse INFO_REQUEST, prompt user and send INFO_RESPONSE
1.23 markus 1375: */
1376: void
1.92 markus 1377: input_userauth_info_req(int type, u_int32_t seq, void *ctxt)
1.23 markus 1378: {
1379: Authctxt *authctxt = ctxt;
1.46 markus 1380: char *name, *inst, *lang, *prompt, *response;
1.32 markus 1381: u_int num_prompts, i;
1.23 markus 1382: int echo = 0;
1383:
1384: debug2("input_userauth_info_req");
1385:
1386: if (authctxt == NULL)
1387: fatal("input_userauth_info_req: no authentication context");
1.82 markus 1388:
1389: authctxt->info_req_seen = 1;
1.23 markus 1390:
1391: name = packet_get_string(NULL);
1392: inst = packet_get_string(NULL);
1393: lang = packet_get_string(NULL);
1394: if (strlen(name) > 0)
1.116 itojun 1395: logit("%s", name);
1.23 markus 1396: if (strlen(inst) > 0)
1.116 itojun 1397: logit("%s", inst);
1.197 djm 1398: free(name);
1399: free(inst);
1400: free(lang);
1.23 markus 1401:
1402: num_prompts = packet_get_int();
1403: /*
1404: * Begin to build info response packet based on prompts requested.
1405: * We commit to providing the correct number of responses, so if
1406: * further on we run into a problem that prevents this, we have to
1407: * be sure and clean this up and send a correct error response.
1408: */
1409: packet_start(SSH2_MSG_USERAUTH_INFO_RESPONSE);
1410: packet_put_int(num_prompts);
1411:
1.73 markus 1412: debug2("input_userauth_info_req: num_prompts %d", num_prompts);
1.23 markus 1413: for (i = 0; i < num_prompts; i++) {
1414: prompt = packet_get_string(NULL);
1415: echo = packet_get_char();
1416:
1.77 markus 1417: response = read_passphrase(prompt, echo ? RP_ECHO : 0);
1.23 markus 1418:
1.49 markus 1419: packet_put_cstring(response);
1.204 djm 1420: explicit_bzero(response, strlen(response));
1.197 djm 1421: free(response);
1422: free(prompt);
1.23 markus 1423: }
1.90 markus 1424: packet_check_eom(); /* done with parsing incoming message. */
1.23 markus 1425:
1.85 markus 1426: packet_add_padding(64);
1.23 markus 1427: packet_send();
1.68 markus 1428: }
1429:
1.100 markus 1430: static int
1.105 deraadt 1431: ssh_keysign(Key *key, u_char **sigp, u_int *lenp,
1.100 markus 1432: u_char *data, u_int datalen)
1433: {
1434: Buffer b;
1.101 markus 1435: struct stat st;
1.100 markus 1436: pid_t pid;
1.103 markus 1437: int to[2], from[2], status, version = 2;
1.100 markus 1438:
1.109 markus 1439: debug2("ssh_keysign called");
1.100 markus 1440:
1.101 markus 1441: if (stat(_PATH_SSH_KEY_SIGN, &st) < 0) {
1.179 dtucker 1442: error("ssh_keysign: not installed: %s", strerror(errno));
1.101 markus 1443: return -1;
1444: }
1.100 markus 1445: if (fflush(stdout) != 0)
1446: error("ssh_keysign: fflush: %s", strerror(errno));
1447: if (pipe(to) < 0) {
1448: error("ssh_keysign: pipe: %s", strerror(errno));
1449: return -1;
1450: }
1451: if (pipe(from) < 0) {
1452: error("ssh_keysign: pipe: %s", strerror(errno));
1453: return -1;
1454: }
1455: if ((pid = fork()) < 0) {
1456: error("ssh_keysign: fork: %s", strerror(errno));
1457: return -1;
1458: }
1459: if (pid == 0) {
1.174 dtucker 1460: /* keep the socket on exec */
1461: fcntl(packet_get_connection_in(), F_SETFD, 0);
1.155 markus 1462: permanently_drop_suid(getuid());
1.100 markus 1463: close(from[0]);
1464: if (dup2(from[1], STDOUT_FILENO) < 0)
1465: fatal("ssh_keysign: dup2: %s", strerror(errno));
1466: close(to[1]);
1467: if (dup2(to[0], STDIN_FILENO) < 0)
1468: fatal("ssh_keysign: dup2: %s", strerror(errno));
1.103 markus 1469: close(from[1]);
1470: close(to[0]);
1.102 markus 1471: execl(_PATH_SSH_KEY_SIGN, _PATH_SSH_KEY_SIGN, (char *) 0);
1.100 markus 1472: fatal("ssh_keysign: exec(%s): %s", _PATH_SSH_KEY_SIGN,
1473: strerror(errno));
1474: }
1475: close(from[1]);
1476: close(to[0]);
1477:
1478: buffer_init(&b);
1.103 markus 1479: buffer_put_int(&b, packet_get_connection_in()); /* send # of socket */
1.100 markus 1480: buffer_put_string(&b, data, datalen);
1.131 djm 1481: if (ssh_msg_send(to[1], version, &b) == -1)
1482: fatal("ssh_keysign: couldn't send request");
1.100 markus 1483:
1.110 djm 1484: if (ssh_msg_recv(from[0], &b) < 0) {
1.101 markus 1485: error("ssh_keysign: no reply");
1.134 markus 1486: buffer_free(&b);
1.100 markus 1487: return -1;
1488: }
1.101 markus 1489: close(from[0]);
1490: close(to[1]);
1491:
1.103 markus 1492: while (waitpid(pid, &status, 0) < 0)
1493: if (errno != EINTR)
1494: break;
1.101 markus 1495:
1.100 markus 1496: if (buffer_get_char(&b) != version) {
1.101 markus 1497: error("ssh_keysign: bad version");
1.134 markus 1498: buffer_free(&b);
1.100 markus 1499: return -1;
1500: }
1501: *sigp = buffer_get_string(&b, lenp);
1.134 markus 1502: buffer_free(&b);
1.100 markus 1503:
1504: return 0;
1505: }
1506:
1.68 markus 1507: int
1508: userauth_hostbased(Authctxt *authctxt)
1509: {
1510: Key *private = NULL;
1.100 markus 1511: Sensitive *sensitive = authctxt->sensitive;
1.68 markus 1512: Buffer b;
1513: u_char *signature, *blob;
1.179 dtucker 1514: char *chost, *pkalg, *p;
1.72 markus 1515: const char *service;
1.68 markus 1516: u_int blen, slen;
1.176 dtucker 1517: int ok, i, found = 0;
1.213 djm 1518:
1519: /* XXX provide some way to allow user to specify key types attempted */
1.68 markus 1520:
1521: /* check for a useful key */
1.100 markus 1522: for (i = 0; i < sensitive->nkeys; i++) {
1523: private = sensitive->keys[i];
1.68 markus 1524: if (private && private->type != KEY_RSA1) {
1525: found = 1;
1526: /* we take and free the key */
1.100 markus 1527: sensitive->keys[i] = NULL;
1.68 markus 1528: break;
1529: }
1530: }
1531: if (!found) {
1.109 markus 1532: debug("No more client hostkeys for hostbased authentication.");
1.68 markus 1533: return 0;
1534: }
1.211 djm 1535:
1536: debug("%s: trying hostkey type %s", __func__, key_type(private));
1537:
1.68 markus 1538: if (key_to_blob(private, &blob, &blen) == 0) {
1539: key_free(private);
1540: return 0;
1541: }
1.211 djm 1542:
1.84 markus 1543: /* figure out a name for the client host */
1.179 dtucker 1544: p = get_local_name(packet_get_connection_in());
1.84 markus 1545: if (p == NULL) {
1546: error("userauth_hostbased: cannot get local ipaddr/name");
1547: key_free(private);
1.197 djm 1548: free(blob);
1.84 markus 1549: return 0;
1550: }
1.150 djm 1551: xasprintf(&chost, "%s.", p);
1.84 markus 1552: debug2("userauth_hostbased: chost %s", chost);
1.197 djm 1553: free(p);
1.84 markus 1554:
1.72 markus 1555: service = datafellows & SSH_BUG_HBSERVICE ? "ssh-userauth" :
1556: authctxt->service;
1.68 markus 1557: pkalg = xstrdup(key_ssh_name(private));
1558: buffer_init(&b);
1559: /* construct data */
1.72 markus 1560: buffer_put_string(&b, session_id2, session_id2_len);
1.68 markus 1561: buffer_put_char(&b, SSH2_MSG_USERAUTH_REQUEST);
1562: buffer_put_cstring(&b, authctxt->server_user);
1.72 markus 1563: buffer_put_cstring(&b, service);
1.68 markus 1564: buffer_put_cstring(&b, authctxt->method->name);
1565: buffer_put_cstring(&b, pkalg);
1566: buffer_put_string(&b, blob, blen);
1567: buffer_put_cstring(&b, chost);
1568: buffer_put_cstring(&b, authctxt->local_user);
1569: #ifdef DEBUG_PK
1570: buffer_dump(&b);
1571: #endif
1.100 markus 1572: if (sensitive->external_keysign)
1573: ok = ssh_keysign(private, &signature, &slen,
1574: buffer_ptr(&b), buffer_len(&b));
1575: else
1576: ok = key_sign(private, &signature, &slen,
1577: buffer_ptr(&b), buffer_len(&b));
1.68 markus 1578: key_free(private);
1579: buffer_free(&b);
1580: if (ok != 0) {
1581: error("key_sign failed");
1.197 djm 1582: free(chost);
1583: free(pkalg);
1584: free(blob);
1.68 markus 1585: return 0;
1586: }
1587: packet_start(SSH2_MSG_USERAUTH_REQUEST);
1588: packet_put_cstring(authctxt->server_user);
1589: packet_put_cstring(authctxt->service);
1590: packet_put_cstring(authctxt->method->name);
1591: packet_put_cstring(pkalg);
1592: packet_put_string(blob, blen);
1593: packet_put_cstring(chost);
1594: packet_put_cstring(authctxt->local_user);
1595: packet_put_string(signature, slen);
1.204 djm 1596: explicit_bzero(signature, slen);
1.197 djm 1597: free(signature);
1598: free(chost);
1599: free(pkalg);
1600: free(blob);
1.68 markus 1601:
1602: packet_send();
1603: return 1;
1.23 markus 1604: }
1.170 djm 1605:
1.20 markus 1606: /* find auth method */
1607:
1608: /*
1609: * given auth method name, if configurable options permit this method fill
1610: * in auth_ident field and return true, otherwise return false.
1611: */
1.76 itojun 1612: static int
1.20 markus 1613: authmethod_is_enabled(Authmethod *method)
1614: {
1615: if (method == NULL)
1616: return 0;
1617: /* return false if options indicate this method is disabled */
1618: if (method->enabled == NULL || *method->enabled == 0)
1619: return 0;
1620: /* return false if batch mode is enabled but method needs interactive mode */
1621: if (method->batch_flag != NULL && *method->batch_flag != 0)
1622: return 0;
1623: return 1;
1624: }
1625:
1.76 itojun 1626: static Authmethod *
1.20 markus 1627: authmethod_lookup(const char *name)
1.1 markus 1628: {
1.20 markus 1629: Authmethod *method = NULL;
1630: if (name != NULL)
1631: for (method = authmethods; method->name != NULL; method++)
1632: if (strcmp(name, method->name) == 0)
1633: return method;
1634: debug2("Unrecognized authentication method name: %s", name ? name : "NULL");
1635: return NULL;
1636: }
1.1 markus 1637:
1.53 markus 1638: /* XXX internal state */
1639: static Authmethod *current = NULL;
1640: static char *supported = NULL;
1641: static char *preferred = NULL;
1.105 deraadt 1642:
1.20 markus 1643: /*
1644: * Given the authentication method list sent by the server, return the
1645: * next method we should try. If the server initially sends a nil list,
1.67 markus 1646: * use a built-in default list.
1.41 stevesk 1647: */
1.76 itojun 1648: static Authmethod *
1.20 markus 1649: authmethod_get(char *authlist)
1650: {
1.53 markus 1651: char *name = NULL;
1.97 markus 1652: u_int next;
1.41 stevesk 1653:
1.20 markus 1654: /* Use a suitable default if we're passed a nil list. */
1655: if (authlist == NULL || strlen(authlist) == 0)
1.53 markus 1656: authlist = options.preferred_authentications;
1.20 markus 1657:
1.53 markus 1658: if (supported == NULL || strcmp(authlist, supported) != 0) {
1659: debug3("start over, passed a different list %s", authlist);
1.197 djm 1660: free(supported);
1.53 markus 1661: supported = xstrdup(authlist);
1662: preferred = options.preferred_authentications;
1663: debug3("preferred %s", preferred);
1664: current = NULL;
1665: } else if (current != NULL && authmethod_is_enabled(current))
1666: return current;
1.20 markus 1667:
1.53 markus 1668: for (;;) {
1669: if ((name = match_list(preferred, supported, &next)) == NULL) {
1.109 markus 1670: debug("No more authentication methods to try.");
1.53 markus 1671: current = NULL;
1672: return NULL;
1673: }
1674: preferred += next;
1.23 markus 1675: debug3("authmethod_lookup %s", name);
1.53 markus 1676: debug3("remaining preferred: %s", preferred);
1677: if ((current = authmethod_lookup(name)) != NULL &&
1678: authmethod_is_enabled(current)) {
1.23 markus 1679: debug3("authmethod_is_enabled %s", name);
1.109 markus 1680: debug("Next authentication method: %s", name);
1.197 djm 1681: free(name);
1.53 markus 1682: return current;
1.23 markus 1683: }
1.198 dtucker 1684: free(name);
1.1 markus 1685: }
1.53 markus 1686: }
1.1 markus 1687:
1.79 stevesk 1688: static char *
1.53 markus 1689: authmethods_get(void)
1690: {
1691: Authmethod *method = NULL;
1.93 markus 1692: Buffer b;
1693: char *list;
1.27 provos 1694:
1.93 markus 1695: buffer_init(&b);
1.53 markus 1696: for (method = authmethods; method->name != NULL; method++) {
1697: if (authmethod_is_enabled(method)) {
1.93 markus 1698: if (buffer_len(&b) > 0)
1699: buffer_append(&b, ",", 1);
1700: buffer_append(&b, method->name, strlen(method->name));
1.53 markus 1701: }
1702: }
1.93 markus 1703: buffer_append(&b, "\0", 1);
1704: list = xstrdup(buffer_ptr(&b));
1705: buffer_free(&b);
1706: return list;
1.1 markus 1707: }
1.170 djm 1708:
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