Annotation of src/usr.bin/ssh/sshconnect2.c, Revision 1.206
1.206 ! djm 1: /* $OpenBSD: sshconnect2.c,v 1.205 2014/03/27 23:01:27 markus 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"
58: #include "readconf.h"
1.137 djm 59: #include "misc.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);
1.111 markus 202: kex->kex[KEX_DH_GRP1_SHA1] = kexdh_client;
1.138 djm 203: kex->kex[KEX_DH_GRP14_SHA1] = kexdh_client;
1.111 markus 204: kex->kex[KEX_DH_GEX_SHA1] = kexgex_client;
1.147 djm 205: kex->kex[KEX_DH_GEX_SHA256] = kexgex_client;
1.184 djm 206: kex->kex[KEX_ECDH_SHA2] = kexecdh_client;
1.199 markus 207: kex->kex[KEX_C25519_SHA256] = kexc25519_client;
1.61 markus 208: kex->client_version_string=client_version_string;
209: kex->server_version_string=server_version_string;
1.75 markus 210: kex->verify_host_key=&verify_host_key_callback;
1.63 markus 211:
212: xxx_kex = kex;
1.22 provos 213:
1.66 markus 214: dispatch_run(DISPATCH_BLOCK, &kex->done, kex);
1.173 andreas 215:
216: if (options.use_roaming && !kex->roaming) {
217: debug("Roaming not allowed by server");
218: options.use_roaming = 0;
219: }
1.62 markus 220:
221: session_id2 = kex->session_id;
222: session_id2_len = kex->session_id_len;
1.22 provos 223:
224: #ifdef DEBUG_KEXDH
225: /* send 1st encrypted/maced/compressed message */
226: packet_start(SSH2_MSG_IGNORE);
227: packet_put_cstring("markus");
228: packet_send();
229: packet_write_wait();
230: #endif
1.1 markus 231: }
1.11 markus 232:
1.1 markus 233: /*
234: * Authenticate user
235: */
1.20 markus 236:
237: typedef struct Authctxt Authctxt;
238: typedef struct Authmethod Authmethod;
1.117 markus 239: typedef struct identity Identity;
240: typedef struct idlist Idlist;
1.20 markus 241:
1.117 markus 242: struct identity {
243: TAILQ_ENTRY(identity) next;
244: AuthenticationConnection *ac; /* set if agent supports key */
245: Key *key; /* public/private key */
246: char *filename; /* comment for agent-only keys */
247: int tried;
248: int isprivate; /* key points to the private key */
1.191 dtucker 249: int userprovided;
1.117 markus 250: };
251: TAILQ_HEAD(idlist, identity);
1.20 markus 252:
253: struct Authctxt {
254: const char *server_user;
1.68 markus 255: const char *local_user;
1.20 markus 256: const char *host;
257: const char *service;
1.23 markus 258: Authmethod *method;
1.183 djm 259: sig_atomic_t success;
1.51 markus 260: char *authlist;
1.68 markus 261: /* pubkey */
1.117 markus 262: Idlist keys;
1.68 markus 263: AuthenticationConnection *agent;
264: /* hostbased */
1.100 markus 265: Sensitive *sensitive;
1.82 markus 266: /* kbd-interactive */
267: int info_req_seen;
1.121 markus 268: /* generic */
269: void *methoddata;
1.20 markus 270: };
271: struct Authmethod {
272: char *name; /* string to compare against server's list */
273: int (*userauth)(Authctxt *authctxt);
1.170 djm 274: void (*cleanup)(Authctxt *authctxt);
1.20 markus 275: int *enabled; /* flag in option struct that enables method */
276: int *batch_flag; /* flag in option struct that disables method */
277: };
278:
1.92 markus 279: void input_userauth_success(int, u_int32_t, void *);
1.172 djm 280: void input_userauth_success_unexpected(int, u_int32_t, void *);
1.92 markus 281: void input_userauth_failure(int, u_int32_t, void *);
282: void input_userauth_banner(int, u_int32_t, void *);
283: void input_userauth_error(int, u_int32_t, void *);
284: void input_userauth_info_req(int, u_int32_t, void *);
285: void input_userauth_pk_ok(int, u_int32_t, void *);
1.99 markus 286: void input_userauth_passwd_changereq(int, u_int32_t, void *);
1.86 itojun 287:
288: int userauth_none(Authctxt *);
289: int userauth_pubkey(Authctxt *);
290: int userauth_passwd(Authctxt *);
291: int userauth_kbdint(Authctxt *);
292: int userauth_hostbased(Authctxt *);
1.20 markus 293:
1.121 markus 294: #ifdef GSSAPI
295: int userauth_gssapi(Authctxt *authctxt);
296: void input_gssapi_response(int type, u_int32_t, void *);
297: void input_gssapi_token(int type, u_int32_t, void *);
298: void input_gssapi_hash(int type, u_int32_t, void *);
299: void input_gssapi_error(int, u_int32_t, void *);
300: void input_gssapi_errtok(int, u_int32_t, void *);
301: #endif
302:
1.86 itojun 303: void userauth(Authctxt *, char *);
1.51 markus 304:
1.117 markus 305: static int sign_and_send_pubkey(Authctxt *, Identity *);
306: static void pubkey_prepare(Authctxt *);
307: static void pubkey_cleanup(Authctxt *);
1.191 dtucker 308: static Key *load_identity_file(char *, int);
1.76 itojun 309:
310: static Authmethod *authmethod_get(char *authlist);
311: static Authmethod *authmethod_lookup(const char *name);
312: static char *authmethods_get(void);
1.20 markus 313:
314: Authmethod authmethods[] = {
1.121 markus 315: #ifdef GSSAPI
1.132 markus 316: {"gssapi-with-mic",
1.121 markus 317: userauth_gssapi,
1.170 djm 318: NULL,
1.121 markus 319: &options.gss_authentication,
320: NULL},
321: #endif
1.81 markus 322: {"hostbased",
323: userauth_hostbased,
1.170 djm 324: NULL,
1.81 markus 325: &options.hostbased_authentication,
326: NULL},
1.20 markus 327: {"publickey",
328: userauth_pubkey,
1.170 djm 329: NULL,
1.28 markus 330: &options.pubkey_authentication,
1.20 markus 331: NULL},
1.81 markus 332: {"keyboard-interactive",
333: userauth_kbdint,
1.170 djm 334: NULL,
1.81 markus 335: &options.kbd_interactive_authentication,
336: &options.batch_mode},
1.20 markus 337: {"password",
338: userauth_passwd,
1.170 djm 339: NULL,
1.20 markus 340: &options.password_authentication,
1.23 markus 341: &options.batch_mode},
342: {"none",
343: userauth_none,
344: NULL,
1.170 djm 345: NULL,
1.23 markus 346: NULL},
1.170 djm 347: {NULL, NULL, NULL, NULL, NULL}
1.20 markus 348: };
349:
350: void
1.68 markus 351: ssh_userauth2(const char *local_user, const char *server_user, char *host,
1.100 markus 352: Sensitive *sensitive)
1.20 markus 353: {
354: Authctxt authctxt;
355: int type;
1.39 markus 356:
1.73 markus 357: if (options.challenge_response_authentication)
1.39 markus 358: options.kbd_interactive_authentication = 1;
1.20 markus 359:
360: packet_start(SSH2_MSG_SERVICE_REQUEST);
361: packet_put_cstring("ssh-userauth");
362: packet_send();
1.108 markus 363: debug("SSH2_MSG_SERVICE_REQUEST sent");
1.20 markus 364: packet_write_wait();
1.91 markus 365: type = packet_read();
1.108 markus 366: if (type != SSH2_MSG_SERVICE_ACCEPT)
367: fatal("Server denied authentication request: %d", type);
1.20 markus 368: if (packet_remaining() > 0) {
1.91 markus 369: char *reply = packet_get_string(NULL);
1.108 markus 370: debug2("service_accept: %s", reply);
1.197 djm 371: free(reply);
1.20 markus 372: } else {
1.109 markus 373: debug2("buggy server: service_accept w/o service");
1.20 markus 374: }
1.90 markus 375: packet_check_eom();
1.108 markus 376: debug("SSH2_MSG_SERVICE_ACCEPT received");
1.20 markus 377:
1.53 markus 378: if (options.preferred_authentications == NULL)
379: options.preferred_authentications = authmethods_get();
380:
1.20 markus 381: /* setup authentication context */
1.82 markus 382: memset(&authctxt, 0, sizeof(authctxt));
1.117 markus 383: pubkey_prepare(&authctxt);
1.20 markus 384: authctxt.server_user = server_user;
1.68 markus 385: authctxt.local_user = local_user;
1.20 markus 386: authctxt.host = host;
387: authctxt.service = "ssh-connection"; /* service name */
388: authctxt.success = 0;
1.23 markus 389: authctxt.method = authmethod_lookup("none");
1.51 markus 390: authctxt.authlist = NULL;
1.121 markus 391: authctxt.methoddata = NULL;
1.100 markus 392: authctxt.sensitive = sensitive;
1.82 markus 393: authctxt.info_req_seen = 0;
1.23 markus 394: if (authctxt.method == NULL)
395: fatal("ssh_userauth2: internal error: cannot send userauth none request");
1.20 markus 396:
397: /* initial userauth request */
1.23 markus 398: userauth_none(&authctxt);
1.20 markus 399:
1.65 markus 400: dispatch_init(&input_userauth_error);
1.20 markus 401: dispatch_set(SSH2_MSG_USERAUTH_SUCCESS, &input_userauth_success);
402: dispatch_set(SSH2_MSG_USERAUTH_FAILURE, &input_userauth_failure);
1.35 markus 403: dispatch_set(SSH2_MSG_USERAUTH_BANNER, &input_userauth_banner);
1.20 markus 404: dispatch_run(DISPATCH_BLOCK, &authctxt.success, &authctxt); /* loop until success */
405:
1.117 markus 406: pubkey_cleanup(&authctxt);
1.119 markus 407: dispatch_range(SSH2_MSG_USERAUTH_MIN, SSH2_MSG_USERAUTH_MAX, NULL);
408:
1.109 markus 409: debug("Authentication succeeded (%s).", authctxt.method->name);
1.20 markus 410: }
1.119 markus 411:
1.20 markus 412: void
1.51 markus 413: userauth(Authctxt *authctxt, char *authlist)
414: {
1.170 djm 415: if (authctxt->method != NULL && authctxt->method->cleanup != NULL)
416: authctxt->method->cleanup(authctxt);
417:
1.197 djm 418: free(authctxt->methoddata);
419: authctxt->methoddata = NULL;
1.51 markus 420: if (authlist == NULL) {
421: authlist = authctxt->authlist;
422: } else {
1.197 djm 423: free(authctxt->authlist);
1.51 markus 424: authctxt->authlist = authlist;
425: }
426: for (;;) {
427: Authmethod *method = authmethod_get(authlist);
428: if (method == NULL)
429: fatal("Permission denied (%s).", authlist);
430: authctxt->method = method;
1.119 markus 431:
432: /* reset the per method handler */
433: dispatch_range(SSH2_MSG_USERAUTH_PER_METHOD_MIN,
434: SSH2_MSG_USERAUTH_PER_METHOD_MAX, NULL);
435:
436: /* and try new method */
1.51 markus 437: if (method->userauth(authctxt) != 0) {
438: debug2("we sent a %s packet, wait for reply", method->name);
439: break;
440: } else {
441: debug2("we did not send a packet, disable method");
442: method->enabled = NULL;
443: }
444: }
445: }
1.105 deraadt 446:
1.169 djm 447: /* ARGSUSED */
1.51 markus 448: void
1.92 markus 449: input_userauth_error(int type, u_int32_t seq, void *ctxt)
1.20 markus 450: {
1.35 markus 451: fatal("input_userauth_error: bad message during authentication: "
1.140 djm 452: "type %d", type);
1.35 markus 453: }
1.105 deraadt 454:
1.169 djm 455: /* ARGSUSED */
1.35 markus 456: void
1.92 markus 457: input_userauth_banner(int type, u_int32_t seq, void *ctxt)
1.35 markus 458: {
1.166 djm 459: char *msg, *raw, *lang;
460: u_int len;
1.126 deraadt 461:
1.35 markus 462: debug3("input_userauth_banner");
1.166 djm 463: raw = packet_get_string(&len);
1.35 markus 464: lang = packet_get_string(NULL);
1.167 markus 465: if (len > 0 && options.log_level >= SYSLOG_LEVEL_INFO) {
1.166 djm 466: if (len > 65536)
467: len = 65536;
1.168 deraadt 468: msg = xmalloc(len * 4 + 1); /* max expansion from strnvis() */
1.177 dtucker 469: strnvis(msg, raw, len * 4 + 1, VIS_SAFE|VIS_OCTAL|VIS_NOSLASH);
1.125 dtucker 470: fprintf(stderr, "%s", msg);
1.197 djm 471: free(msg);
1.166 djm 472: }
1.197 djm 473: free(raw);
474: free(lang);
1.20 markus 475: }
1.105 deraadt 476:
1.169 djm 477: /* ARGSUSED */
1.20 markus 478: void
1.92 markus 479: input_userauth_success(int type, u_int32_t seq, void *ctxt)
1.20 markus 480: {
481: Authctxt *authctxt = ctxt;
1.172 djm 482:
1.20 markus 483: if (authctxt == NULL)
484: fatal("input_userauth_success: no authentication context");
1.197 djm 485: free(authctxt->authlist);
486: authctxt->authlist = NULL;
1.172 djm 487: if (authctxt->method != NULL && authctxt->method->cleanup != NULL)
488: authctxt->method->cleanup(authctxt);
1.197 djm 489: free(authctxt->methoddata);
490: authctxt->methoddata = NULL;
1.20 markus 491: authctxt->success = 1; /* break out */
492: }
1.105 deraadt 493:
1.172 djm 494: void
495: input_userauth_success_unexpected(int type, u_int32_t seq, void *ctxt)
496: {
497: Authctxt *authctxt = ctxt;
498:
499: if (authctxt == NULL)
500: fatal("%s: no authentication context", __func__);
501:
502: fatal("Unexpected authentication success during %s.",
503: authctxt->method->name);
504: }
505:
1.169 djm 506: /* ARGSUSED */
1.20 markus 507: void
1.92 markus 508: input_userauth_failure(int type, u_int32_t seq, void *ctxt)
1.20 markus 509: {
510: Authctxt *authctxt = ctxt;
511: char *authlist = NULL;
512: int partial;
513:
514: if (authctxt == NULL)
515: fatal("input_userauth_failure: no authentication context");
516:
1.23 markus 517: authlist = packet_get_string(NULL);
1.20 markus 518: partial = packet_get_char();
1.90 markus 519: packet_check_eom();
1.20 markus 520:
1.193 markus 521: if (partial != 0) {
1.116 itojun 522: logit("Authenticated with partial success.");
1.193 markus 523: /* reset state */
524: pubkey_cleanup(authctxt);
525: pubkey_prepare(authctxt);
526: }
1.109 markus 527: debug("Authentications that can continue: %s", authlist);
1.20 markus 528:
1.51 markus 529: userauth(authctxt, authlist);
530: }
1.169 djm 531:
532: /* ARGSUSED */
1.51 markus 533: void
1.92 markus 534: input_userauth_pk_ok(int type, u_int32_t seq, void *ctxt)
1.51 markus 535: {
536: Authctxt *authctxt = ctxt;
537: Key *key = NULL;
1.117 markus 538: Identity *id = NULL;
1.51 markus 539: Buffer b;
1.96 markus 540: int pktype, sent = 0;
541: u_int alen, blen;
542: char *pkalg, *fp;
543: u_char *pkblob;
1.51 markus 544:
545: if (authctxt == NULL)
546: fatal("input_userauth_pk_ok: no authentication context");
547: if (datafellows & SSH_BUG_PKOK) {
548: /* this is similar to SSH_BUG_PKAUTH */
549: debug2("input_userauth_pk_ok: SSH_BUG_PKOK");
550: pkblob = packet_get_string(&blen);
551: buffer_init(&b);
552: buffer_append(&b, pkblob, blen);
553: pkalg = buffer_get_string(&b, &alen);
554: buffer_free(&b);
555: } else {
556: pkalg = packet_get_string(&alen);
557: pkblob = packet_get_string(&blen);
558: }
1.90 markus 559: packet_check_eom();
1.51 markus 560:
1.117 markus 561: debug("Server accepts key: pkalg %s blen %u", pkalg, blen);
1.51 markus 562:
1.117 markus 563: if ((pktype = key_type_from_name(pkalg)) == KEY_UNSPEC) {
564: debug("unknown pkalg %s", pkalg);
565: goto done;
566: }
567: if ((key = key_from_blob(pkblob, blen)) == NULL) {
568: debug("no key from blob. pkalg %s", pkalg);
569: goto done;
570: }
571: if (key->type != pktype) {
572: error("input_userauth_pk_ok: type mismatch "
573: "for decoded key (received %d, expected %d)",
574: key->type, pktype);
575: goto done;
576: }
577: fp = key_fingerprint(key, SSH_FP_MD5, SSH_FP_HEX);
578: debug2("input_userauth_pk_ok: fp %s", fp);
1.197 djm 579: free(fp);
1.117 markus 580:
1.127 markus 581: /*
582: * search keys in the reverse order, because last candidate has been
583: * moved to the end of the queue. this also avoids confusion by
584: * duplicate keys
585: */
1.136 henning 586: TAILQ_FOREACH_REVERSE(id, &authctxt->keys, idlist, next) {
1.117 markus 587: if (key_equal(key, id->key)) {
588: sent = sign_and_send_pubkey(authctxt, id);
1.51 markus 589: break;
590: }
1.117 markus 591: }
592: done:
1.51 markus 593: if (key != NULL)
594: key_free(key);
1.197 djm 595: free(pkalg);
596: free(pkblob);
1.51 markus 597:
1.106 deraadt 598: /* try another method if we did not send a packet */
1.51 markus 599: if (sent == 0)
600: userauth(authctxt, NULL);
1.20 markus 601: }
1.121 markus 602:
603: #ifdef GSSAPI
1.133 djm 604: int
1.121 markus 605: userauth_gssapi(Authctxt *authctxt)
606: {
607: Gssctxt *gssctxt = NULL;
1.128 avsm 608: static gss_OID_set gss_supported = NULL;
1.139 djm 609: static u_int mech = 0;
1.121 markus 610: OM_uint32 min;
611: int ok = 0;
612:
613: /* Try one GSSAPI method at a time, rather than sending them all at
614: * once. */
615:
1.128 avsm 616: if (gss_supported == NULL)
617: gss_indicate_mechs(&min, &gss_supported);
1.121 markus 618:
619: /* Check to see if the mechanism is usable before we offer it */
1.128 avsm 620: while (mech < gss_supported->count && !ok) {
1.121 markus 621: /* My DER encoding requires length<128 */
1.128 avsm 622: if (gss_supported->elements[mech].length < 128 &&
1.161 djm 623: ssh_gssapi_check_mechanism(&gssctxt,
624: &gss_supported->elements[mech], authctxt->host)) {
1.121 markus 625: ok = 1; /* Mechanism works */
626: } else {
627: mech++;
628: }
629: }
630:
1.161 djm 631: if (!ok)
1.139 djm 632: return 0;
1.121 markus 633:
634: authctxt->methoddata=(void *)gssctxt;
635:
636: packet_start(SSH2_MSG_USERAUTH_REQUEST);
637: packet_put_cstring(authctxt->server_user);
638: packet_put_cstring(authctxt->service);
639: packet_put_cstring(authctxt->method->name);
640:
641: packet_put_int(1);
642:
1.129 markus 643: packet_put_int((gss_supported->elements[mech].length) + 2);
644: packet_put_char(SSH_GSS_OIDTYPE);
645: packet_put_char(gss_supported->elements[mech].length);
646: packet_put_raw(gss_supported->elements[mech].elements,
647: gss_supported->elements[mech].length);
1.121 markus 648:
649: packet_send();
650:
651: dispatch_set(SSH2_MSG_USERAUTH_GSSAPI_RESPONSE, &input_gssapi_response);
652: dispatch_set(SSH2_MSG_USERAUTH_GSSAPI_TOKEN, &input_gssapi_token);
653: dispatch_set(SSH2_MSG_USERAUTH_GSSAPI_ERROR, &input_gssapi_error);
654: dispatch_set(SSH2_MSG_USERAUTH_GSSAPI_ERRTOK, &input_gssapi_errtok);
655:
656: mech++; /* Move along to next candidate */
657:
658: return 1;
659: }
660:
1.130 markus 661: static OM_uint32
662: process_gssapi_token(void *ctxt, gss_buffer_t recv_tok)
663: {
664: Authctxt *authctxt = ctxt;
665: Gssctxt *gssctxt = authctxt->methoddata;
666: gss_buffer_desc send_tok = GSS_C_EMPTY_BUFFER;
1.142 djm 667: gss_buffer_desc mic = GSS_C_EMPTY_BUFFER;
668: gss_buffer_desc gssbuf;
1.132 markus 669: OM_uint32 status, ms, flags;
670: Buffer b;
1.133 djm 671:
1.130 markus 672: status = ssh_gssapi_init_ctx(gssctxt, options.gss_deleg_creds,
1.132 markus 673: recv_tok, &send_tok, &flags);
1.130 markus 674:
675: if (send_tok.length > 0) {
676: if (GSS_ERROR(status))
677: packet_start(SSH2_MSG_USERAUTH_GSSAPI_ERRTOK);
678: else
679: packet_start(SSH2_MSG_USERAUTH_GSSAPI_TOKEN);
1.133 djm 680:
1.130 markus 681: packet_put_string(send_tok.value, send_tok.length);
682: packet_send();
683: gss_release_buffer(&ms, &send_tok);
684: }
1.133 djm 685:
1.130 markus 686: if (status == GSS_S_COMPLETE) {
1.132 markus 687: /* send either complete or MIC, depending on mechanism */
688: if (!(flags & GSS_C_INTEG_FLAG)) {
689: packet_start(SSH2_MSG_USERAUTH_GSSAPI_EXCHANGE_COMPLETE);
690: packet_send();
691: } else {
692: ssh_gssapi_buildmic(&b, authctxt->server_user,
693: authctxt->service, "gssapi-with-mic");
694:
695: gssbuf.value = buffer_ptr(&b);
696: gssbuf.length = buffer_len(&b);
1.133 djm 697:
1.132 markus 698: status = ssh_gssapi_sign(gssctxt, &gssbuf, &mic);
1.133 djm 699:
1.132 markus 700: if (!GSS_ERROR(status)) {
701: packet_start(SSH2_MSG_USERAUTH_GSSAPI_MIC);
702: packet_put_string(mic.value, mic.length);
1.133 djm 703:
1.132 markus 704: packet_send();
705: }
1.133 djm 706:
1.132 markus 707: buffer_free(&b);
708: gss_release_buffer(&ms, &mic);
1.133 djm 709: }
1.130 markus 710: }
1.133 djm 711:
1.130 markus 712: return status;
713: }
714:
1.169 djm 715: /* ARGSUSED */
1.121 markus 716: void
717: input_gssapi_response(int type, u_int32_t plen, void *ctxt)
718: {
719: Authctxt *authctxt = ctxt;
720: Gssctxt *gssctxt;
721: int oidlen;
722: char *oidv;
723:
724: if (authctxt == NULL)
725: fatal("input_gssapi_response: no authentication context");
726: gssctxt = authctxt->methoddata;
727:
728: /* Setup our OID */
729: oidv = packet_get_string(&oidlen);
730:
1.129 markus 731: if (oidlen <= 2 ||
732: oidv[0] != SSH_GSS_OIDTYPE ||
733: oidv[1] != oidlen - 2) {
1.197 djm 734: free(oidv);
1.129 markus 735: debug("Badly encoded mechanism OID received");
736: userauth(authctxt, NULL);
737: return;
1.121 markus 738: }
1.129 markus 739:
740: if (!ssh_gssapi_check_oid(gssctxt, oidv + 2, oidlen - 2))
741: fatal("Server returned different OID than expected");
1.121 markus 742:
743: packet_check_eom();
744:
1.197 djm 745: free(oidv);
1.121 markus 746:
1.130 markus 747: if (GSS_ERROR(process_gssapi_token(ctxt, GSS_C_NO_BUFFER))) {
1.121 markus 748: /* Start again with next method on list */
749: debug("Trying to start again");
750: userauth(authctxt, NULL);
751: return;
752: }
753: }
754:
1.169 djm 755: /* ARGSUSED */
1.121 markus 756: void
757: input_gssapi_token(int type, u_int32_t plen, void *ctxt)
758: {
759: Authctxt *authctxt = ctxt;
760: gss_buffer_desc recv_tok;
1.130 markus 761: OM_uint32 status;
1.121 markus 762: u_int slen;
763:
764: if (authctxt == NULL)
765: fatal("input_gssapi_response: no authentication context");
766:
767: recv_tok.value = packet_get_string(&slen);
768: recv_tok.length = slen; /* safe typecast */
769:
770: packet_check_eom();
771:
1.130 markus 772: status = process_gssapi_token(ctxt, &recv_tok);
1.121 markus 773:
1.197 djm 774: free(recv_tok.value);
1.121 markus 775:
776: if (GSS_ERROR(status)) {
777: /* Start again with the next method in the list */
778: userauth(authctxt, NULL);
779: return;
780: }
781: }
782:
1.169 djm 783: /* ARGSUSED */
1.121 markus 784: void
785: input_gssapi_errtok(int type, u_int32_t plen, void *ctxt)
786: {
787: Authctxt *authctxt = ctxt;
788: Gssctxt *gssctxt;
789: gss_buffer_desc send_tok = GSS_C_EMPTY_BUFFER;
790: gss_buffer_desc recv_tok;
1.194 djm 791: OM_uint32 ms;
1.123 deraadt 792: u_int len;
1.121 markus 793:
794: if (authctxt == NULL)
795: fatal("input_gssapi_response: no authentication context");
796: gssctxt = authctxt->methoddata;
797:
1.123 deraadt 798: recv_tok.value = packet_get_string(&len);
799: recv_tok.length = len;
1.121 markus 800:
801: packet_check_eom();
802:
803: /* Stick it into GSSAPI and see what it says */
1.194 djm 804: (void)ssh_gssapi_init_ctx(gssctxt, options.gss_deleg_creds,
1.140 djm 805: &recv_tok, &send_tok, NULL);
1.121 markus 806:
1.197 djm 807: free(recv_tok.value);
1.121 markus 808: gss_release_buffer(&ms, &send_tok);
809:
810: /* Server will be returning a failed packet after this one */
811: }
812:
1.169 djm 813: /* ARGSUSED */
1.121 markus 814: void
815: input_gssapi_error(int type, u_int32_t plen, void *ctxt)
816: {
817: char *msg;
818: char *lang;
819:
1.194 djm 820: /* maj */(void)packet_get_int();
821: /* min */(void)packet_get_int();
1.121 markus 822: msg=packet_get_string(NULL);
823: lang=packet_get_string(NULL);
824:
825: packet_check_eom();
826:
1.143 stevesk 827: debug("Server GSSAPI Error:\n%s", msg);
1.197 djm 828: free(msg);
829: free(lang);
1.121 markus 830: }
831: #endif /* GSSAPI */
1.20 markus 832:
1.1 markus 833: int
1.23 markus 834: userauth_none(Authctxt *authctxt)
835: {
836: /* initial userauth request */
837: packet_start(SSH2_MSG_USERAUTH_REQUEST);
838: packet_put_cstring(authctxt->server_user);
839: packet_put_cstring(authctxt->service);
840: packet_put_cstring(authctxt->method->name);
841: packet_send();
842: return 1;
843: }
844:
845: int
1.20 markus 846: userauth_passwd(Authctxt *authctxt)
1.1 markus 847: {
1.6 markus 848: static int attempt = 0;
1.99 markus 849: char prompt[150];
1.1 markus 850: char *password;
1.175 dtucker 851: const char *host = options.host_key_alias ? options.host_key_alias :
852: authctxt->host;
1.6 markus 853:
1.13 todd 854: if (attempt++ >= options.number_of_password_prompts)
1.6 markus 855: return 0;
1.13 todd 856:
1.87 deraadt 857: if (attempt != 1)
1.13 todd 858: error("Permission denied, please try again.");
1.1 markus 859:
1.43 itojun 860: snprintf(prompt, sizeof(prompt), "%.30s@%.128s's password: ",
1.175 dtucker 861: authctxt->server_user, host);
1.1 markus 862: password = read_passphrase(prompt, 0);
863: packet_start(SSH2_MSG_USERAUTH_REQUEST);
1.20 markus 864: packet_put_cstring(authctxt->server_user);
865: packet_put_cstring(authctxt->service);
1.23 markus 866: packet_put_cstring(authctxt->method->name);
1.1 markus 867: packet_put_char(0);
1.49 markus 868: packet_put_cstring(password);
1.204 djm 869: explicit_bzero(password, strlen(password));
1.197 djm 870: free(password);
1.85 markus 871: packet_add_padding(64);
1.1 markus 872: packet_send();
1.99 markus 873:
1.104 deraadt 874: dispatch_set(SSH2_MSG_USERAUTH_PASSWD_CHANGEREQ,
1.99 markus 875: &input_userauth_passwd_changereq);
876:
1.1 markus 877: return 1;
878: }
1.169 djm 879:
1.99 markus 880: /*
881: * parse PASSWD_CHANGEREQ, prompt user and send SSH2_MSG_USERAUTH_REQUEST
882: */
1.169 djm 883: /* ARGSUSED */
1.99 markus 884: void
1.153 djm 885: input_userauth_passwd_changereq(int type, u_int32_t seqnr, void *ctxt)
1.99 markus 886: {
887: Authctxt *authctxt = ctxt;
888: char *info, *lang, *password = NULL, *retype = NULL;
889: char prompt[150];
1.175 dtucker 890: const char *host = options.host_key_alias ? options.host_key_alias :
891: authctxt->host;
1.99 markus 892:
893: debug2("input_userauth_passwd_changereq");
894:
895: if (authctxt == NULL)
896: fatal("input_userauth_passwd_changereq: "
897: "no authentication context");
898:
899: info = packet_get_string(NULL);
900: lang = packet_get_string(NULL);
901: if (strlen(info) > 0)
1.116 itojun 902: logit("%s", info);
1.197 djm 903: free(info);
904: free(lang);
1.99 markus 905: packet_start(SSH2_MSG_USERAUTH_REQUEST);
906: packet_put_cstring(authctxt->server_user);
907: packet_put_cstring(authctxt->service);
908: packet_put_cstring(authctxt->method->name);
909: packet_put_char(1); /* additional info */
1.104 deraadt 910: snprintf(prompt, sizeof(prompt),
1.99 markus 911: "Enter %.30s@%.128s's old password: ",
1.175 dtucker 912: authctxt->server_user, host);
1.99 markus 913: password = read_passphrase(prompt, 0);
914: packet_put_cstring(password);
1.204 djm 915: explicit_bzero(password, strlen(password));
1.197 djm 916: free(password);
1.99 markus 917: password = NULL;
918: while (password == NULL) {
1.104 deraadt 919: snprintf(prompt, sizeof(prompt),
1.99 markus 920: "Enter %.30s@%.128s's new password: ",
1.175 dtucker 921: authctxt->server_user, host);
1.99 markus 922: password = read_passphrase(prompt, RP_ALLOW_EOF);
923: if (password == NULL) {
924: /* bail out */
925: return;
926: }
1.104 deraadt 927: snprintf(prompt, sizeof(prompt),
1.99 markus 928: "Retype %.30s@%.128s's new password: ",
1.175 dtucker 929: authctxt->server_user, host);
1.99 markus 930: retype = read_passphrase(prompt, 0);
931: if (strcmp(password, retype) != 0) {
1.204 djm 932: explicit_bzero(password, strlen(password));
1.197 djm 933: free(password);
1.116 itojun 934: logit("Mismatch; try again, EOF to quit.");
1.99 markus 935: password = NULL;
936: }
1.204 djm 937: explicit_bzero(retype, strlen(retype));
1.197 djm 938: free(retype);
1.99 markus 939: }
940: packet_put_cstring(password);
1.204 djm 941: explicit_bzero(password, strlen(password));
1.197 djm 942: free(password);
1.99 markus 943: packet_add_padding(64);
944: packet_send();
1.104 deraadt 945:
946: dispatch_set(SSH2_MSG_USERAUTH_PASSWD_CHANGEREQ,
1.99 markus 947: &input_userauth_passwd_changereq);
1.117 markus 948: }
949:
950: static int
951: identity_sign(Identity *id, u_char **sigp, u_int *lenp,
952: u_char *data, u_int datalen)
953: {
954: Key *prv;
955: int ret;
1.99 markus 956:
1.117 markus 957: /* the agent supports this key */
958: if (id->ac)
959: return (ssh_agent_sign(id->ac, id->key, sigp, lenp,
960: data, datalen));
961: /*
962: * we have already loaded the private key or
963: * the private key is stored in external hardware
964: */
965: if (id->isprivate || (id->key->flags & KEY_FLAG_EXT))
966: return (key_sign(id->key, sigp, lenp, data, datalen));
967: /* load the private key from the file */
1.191 dtucker 968: if ((prv = load_identity_file(id->filename, id->userprovided)) == NULL)
1.117 markus 969: return (-1);
970: ret = key_sign(prv, sigp, lenp, data, datalen);
971: key_free(prv);
972: return (ret);
1.51 markus 973: }
974:
1.76 itojun 975: static int
1.117 markus 976: sign_and_send_pubkey(Authctxt *authctxt, Identity *id)
1.1 markus 977: {
978: Buffer b;
1.32 markus 979: u_char *blob, *signature;
1.96 markus 980: u_int bloblen, slen;
1.120 markus 981: u_int skip = 0;
1.17 markus 982: int ret = -1;
1.23 markus 983: int have_sig = 1;
1.182 djm 984: char *fp;
1.1 markus 985:
1.182 djm 986: fp = key_fingerprint(id->key, SSH_FP_MD5, SSH_FP_HEX);
987: debug3("sign_and_send_pubkey: %s %s", key_type(id->key), fp);
1.197 djm 988: free(fp);
1.51 markus 989:
1.117 markus 990: if (key_to_blob(id->key, &blob, &bloblen) == 0) {
1.28 markus 991: /* we cannot handle this key */
1.30 markus 992: debug3("sign_and_send_pubkey: cannot handle key");
1.28 markus 993: return 0;
994: }
1.1 markus 995: /* data to be signed */
996: buffer_init(&b);
1.26 markus 997: if (datafellows & SSH_OLD_SESSIONID) {
998: buffer_append(&b, session_id2, session_id2_len);
1.41 stevesk 999: skip = session_id2_len;
1.26 markus 1000: } else {
1.14 markus 1001: buffer_put_string(&b, session_id2, session_id2_len);
1002: skip = buffer_len(&b);
1003: }
1.1 markus 1004: buffer_put_char(&b, SSH2_MSG_USERAUTH_REQUEST);
1.20 markus 1005: buffer_put_cstring(&b, authctxt->server_user);
1.10 markus 1006: buffer_put_cstring(&b,
1.30 markus 1007: datafellows & SSH_BUG_PKSERVICE ?
1.10 markus 1008: "ssh-userauth" :
1.20 markus 1009: authctxt->service);
1.30 markus 1010: if (datafellows & SSH_BUG_PKAUTH) {
1011: buffer_put_char(&b, have_sig);
1012: } else {
1013: buffer_put_cstring(&b, authctxt->method->name);
1014: buffer_put_char(&b, have_sig);
1.117 markus 1015: buffer_put_cstring(&b, key_ssh_name(id->key));
1.30 markus 1016: }
1.1 markus 1017: buffer_put_string(&b, blob, bloblen);
1018:
1019: /* generate signature */
1.117 markus 1020: ret = identity_sign(id, &signature, &slen,
1.51 markus 1021: buffer_ptr(&b), buffer_len(&b));
1.17 markus 1022: if (ret == -1) {
1.197 djm 1023: free(blob);
1.17 markus 1024: buffer_free(&b);
1025: return 0;
1026: }
1.28 markus 1027: #ifdef DEBUG_PK
1.1 markus 1028: buffer_dump(&b);
1029: #endif
1.30 markus 1030: if (datafellows & SSH_BUG_PKSERVICE) {
1.10 markus 1031: buffer_clear(&b);
1032: buffer_append(&b, session_id2, session_id2_len);
1.51 markus 1033: skip = session_id2_len;
1.10 markus 1034: buffer_put_char(&b, SSH2_MSG_USERAUTH_REQUEST);
1.20 markus 1035: buffer_put_cstring(&b, authctxt->server_user);
1036: buffer_put_cstring(&b, authctxt->service);
1.23 markus 1037: buffer_put_cstring(&b, authctxt->method->name);
1038: buffer_put_char(&b, have_sig);
1.30 markus 1039: if (!(datafellows & SSH_BUG_PKAUTH))
1.117 markus 1040: buffer_put_cstring(&b, key_ssh_name(id->key));
1.10 markus 1041: buffer_put_string(&b, blob, bloblen);
1042: }
1.197 djm 1043: free(blob);
1.51 markus 1044:
1.1 markus 1045: /* append signature */
1046: buffer_put_string(&b, signature, slen);
1.197 djm 1047: free(signature);
1.1 markus 1048:
1049: /* skip session id and packet type */
1.14 markus 1050: if (buffer_len(&b) < skip + 1)
1.20 markus 1051: fatal("userauth_pubkey: internal error");
1.14 markus 1052: buffer_consume(&b, skip + 1);
1.1 markus 1053:
1054: /* put remaining data from buffer into packet */
1055: packet_start(SSH2_MSG_USERAUTH_REQUEST);
1056: packet_put_raw(buffer_ptr(&b), buffer_len(&b));
1057: buffer_free(&b);
1058: packet_send();
1.17 markus 1059:
1060: return 1;
1.16 markus 1061: }
1062:
1.76 itojun 1063: static int
1.117 markus 1064: send_pubkey_test(Authctxt *authctxt, Identity *id)
1.20 markus 1065: {
1.51 markus 1066: u_char *blob;
1.97 markus 1067: u_int bloblen, have_sig = 0;
1.20 markus 1068:
1.51 markus 1069: debug3("send_pubkey_test");
1.16 markus 1070:
1.117 markus 1071: if (key_to_blob(id->key, &blob, &bloblen) == 0) {
1.51 markus 1072: /* we cannot handle this key */
1073: debug3("send_pubkey_test: cannot handle key");
1.16 markus 1074: return 0;
1075: }
1.51 markus 1076: /* register callback for USERAUTH_PK_OK message */
1077: dispatch_set(SSH2_MSG_USERAUTH_PK_OK, &input_userauth_pk_ok);
1078:
1079: packet_start(SSH2_MSG_USERAUTH_REQUEST);
1080: packet_put_cstring(authctxt->server_user);
1081: packet_put_cstring(authctxt->service);
1082: packet_put_cstring(authctxt->method->name);
1083: packet_put_char(have_sig);
1084: if (!(datafellows & SSH_BUG_PKAUTH))
1.117 markus 1085: packet_put_cstring(key_ssh_name(id->key));
1.51 markus 1086: packet_put_string(blob, bloblen);
1.197 djm 1087: free(blob);
1.51 markus 1088: packet_send();
1089: return 1;
1090: }
1091:
1.76 itojun 1092: static Key *
1.191 dtucker 1093: load_identity_file(char *filename, int userprovided)
1.51 markus 1094: {
1095: Key *private;
1096: char prompt[300], *passphrase;
1.178 dtucker 1097: int perm_ok = 0, quit, i;
1.52 markus 1098: struct stat st;
1.16 markus 1099:
1.52 markus 1100: if (stat(filename, &st) < 0) {
1.191 dtucker 1101: (userprovided ? logit : debug3)("no such identity: %s: %s",
1102: filename, strerror(errno));
1.52 markus 1103: return NULL;
1104: }
1.152 dtucker 1105: private = key_load_private_type(KEY_UNSPEC, filename, "", NULL, &perm_ok);
1.198 dtucker 1106: if (!perm_ok) {
1107: if (private != NULL)
1108: key_free(private);
1.152 dtucker 1109: return NULL;
1.198 dtucker 1110: }
1.56 markus 1111: if (private == NULL) {
1112: if (options.batch_mode)
1.51 markus 1113: return NULL;
1.16 markus 1114: snprintf(prompt, sizeof prompt,
1.88 deraadt 1115: "Enter passphrase for key '%.100s': ", filename);
1.20 markus 1116: for (i = 0; i < options.number_of_password_prompts; i++) {
1117: passphrase = read_passphrase(prompt, 0);
1118: if (strcmp(passphrase, "") != 0) {
1.152 dtucker 1119: private = key_load_private_type(KEY_UNSPEC,
1120: filename, passphrase, NULL, NULL);
1.51 markus 1121: quit = 0;
1.20 markus 1122: } else {
1123: debug2("no passphrase given, try next key");
1.51 markus 1124: quit = 1;
1.20 markus 1125: }
1.204 djm 1126: explicit_bzero(passphrase, strlen(passphrase));
1.197 djm 1127: free(passphrase);
1.56 markus 1128: if (private != NULL || quit)
1.20 markus 1129: break;
1130: debug2("bad passphrase given, try again...");
1.16 markus 1131: }
1132: }
1.51 markus 1133: return private;
1134: }
1135:
1.117 markus 1136: /*
1137: * try keys in the following order:
1138: * 1. agent keys that are found in the config file
1139: * 2. other agent keys
1140: * 3. keys that are only listed in the config file
1141: */
1142: static void
1143: pubkey_prepare(Authctxt *authctxt)
1.51 markus 1144: {
1.190 djm 1145: Identity *id, *id2, *tmp;
1.117 markus 1146: Idlist agent, files, *preferred;
1147: Key *key;
1148: AuthenticationConnection *ac;
1149: char *comment;
1150: int i, found;
1.51 markus 1151:
1.117 markus 1152: TAILQ_INIT(&agent); /* keys from the agent */
1153: TAILQ_INIT(&files); /* keys from the config file */
1154: preferred = &authctxt->keys;
1155: TAILQ_INIT(preferred); /* preferred order of keys */
1156:
1.190 djm 1157: /* list of keys stored in the filesystem and PKCS#11 */
1.117 markus 1158: for (i = 0; i < options.num_identity_files; i++) {
1159: key = options.identity_keys[i];
1160: if (key && key->type == KEY_RSA1)
1.180 djm 1161: continue;
1162: if (key && key->cert && key->cert->type != SSH2_CERT_TYPE_USER)
1.117 markus 1163: continue;
1164: options.identity_keys[i] = NULL;
1.150 djm 1165: id = xcalloc(1, sizeof(*id));
1.117 markus 1166: id->key = key;
1167: id->filename = xstrdup(options.identity_files[i]);
1.192 dtucker 1168: id->userprovided = options.identity_file_userprovided[i];
1.117 markus 1169: TAILQ_INSERT_TAIL(&files, id, next);
1.190 djm 1170: }
1171: /* Prefer PKCS11 keys that are explicitly listed */
1172: TAILQ_FOREACH_SAFE(id, &files, next, tmp) {
1173: if (id->key == NULL || (id->key->flags & KEY_FLAG_EXT) == 0)
1174: continue;
1175: found = 0;
1176: TAILQ_FOREACH(id2, &files, next) {
1177: if (id2->key == NULL ||
1178: (id2->key->flags & KEY_FLAG_EXT) != 0)
1179: continue;
1180: if (key_equal(id->key, id2->key)) {
1181: TAILQ_REMOVE(&files, id, next);
1182: TAILQ_INSERT_TAIL(preferred, id, next);
1183: found = 1;
1184: break;
1185: }
1186: }
1187: /* If IdentitiesOnly set and key not found then don't use it */
1188: if (!found && options.identities_only) {
1189: TAILQ_REMOVE(&files, id, next);
1.203 tedu 1190: explicit_bzero(id, sizeof(*id));
1.190 djm 1191: free(id);
1192: }
1.117 markus 1193: }
1194: /* list of keys supported by the agent */
1195: if ((ac = ssh_get_authentication_connection())) {
1196: for (key = ssh_get_first_identity(ac, &comment, 2);
1197: key != NULL;
1198: key = ssh_get_next_identity(ac, &comment, 2)) {
1199: found = 0;
1200: TAILQ_FOREACH(id, &files, next) {
1.133 djm 1201: /* agent keys from the config file are preferred */
1.117 markus 1202: if (key_equal(key, id->key)) {
1203: key_free(key);
1.197 djm 1204: free(comment);
1.117 markus 1205: TAILQ_REMOVE(&files, id, next);
1206: TAILQ_INSERT_TAIL(preferred, id, next);
1207: id->ac = ac;
1208: found = 1;
1209: break;
1210: }
1211: }
1.135 markus 1212: if (!found && !options.identities_only) {
1.150 djm 1213: id = xcalloc(1, sizeof(*id));
1.117 markus 1214: id->key = key;
1215: id->filename = comment;
1216: id->ac = ac;
1217: TAILQ_INSERT_TAIL(&agent, id, next);
1218: }
1219: }
1220: /* append remaining agent keys */
1221: for (id = TAILQ_FIRST(&agent); id; id = TAILQ_FIRST(&agent)) {
1222: TAILQ_REMOVE(&agent, id, next);
1223: TAILQ_INSERT_TAIL(preferred, id, next);
1224: }
1225: authctxt->agent = ac;
1226: }
1227: /* append remaining keys from the config file */
1228: for (id = TAILQ_FIRST(&files); id; id = TAILQ_FIRST(&files)) {
1229: TAILQ_REMOVE(&files, id, next);
1230: TAILQ_INSERT_TAIL(preferred, id, next);
1231: }
1232: TAILQ_FOREACH(id, preferred, next) {
1.191 dtucker 1233: debug2("key: %s (%p),%s", id->filename, id->key,
1234: id->userprovided ? " explicit" : "");
1.117 markus 1235: }
1.17 markus 1236: }
1237:
1.117 markus 1238: static void
1239: pubkey_cleanup(Authctxt *authctxt)
1.51 markus 1240: {
1.117 markus 1241: Identity *id;
1.51 markus 1242:
1.117 markus 1243: if (authctxt->agent != NULL)
1244: ssh_close_authentication_connection(authctxt->agent);
1245: for (id = TAILQ_FIRST(&authctxt->keys); id;
1246: id = TAILQ_FIRST(&authctxt->keys)) {
1247: TAILQ_REMOVE(&authctxt->keys, id, next);
1248: if (id->key)
1249: key_free(id->key);
1.197 djm 1250: free(id->filename);
1251: free(id);
1.117 markus 1252: }
1.1 markus 1253: }
1254:
1.20 markus 1255: int
1256: userauth_pubkey(Authctxt *authctxt)
1257: {
1.117 markus 1258: Identity *id;
1.20 markus 1259: int sent = 0;
1260:
1.117 markus 1261: while ((id = TAILQ_FIRST(&authctxt->keys))) {
1262: if (id->tried++)
1263: return (0);
1.127 markus 1264: /* move key to the end of the queue */
1.117 markus 1265: TAILQ_REMOVE(&authctxt->keys, id, next);
1266: TAILQ_INSERT_TAIL(&authctxt->keys, id, next);
1267: /*
1268: * send a test message if we have the public key. for
1269: * encrypted keys we cannot do this and have to load the
1270: * private key instead
1271: */
1.200 djm 1272: if (id->key != NULL) {
1273: if (key_type_plain(id->key->type) == KEY_RSA &&
1274: (datafellows & SSH_BUG_RSASIGMD5) != 0) {
1275: debug("Skipped %s key %s for RSA/MD5 server",
1276: key_type(id->key), id->filename);
1277: } else if (id->key->type != KEY_RSA1) {
1278: debug("Offering %s public key: %s",
1279: key_type(id->key), id->filename);
1280: sent = send_pubkey_test(authctxt, id);
1281: }
1282: } else {
1.117 markus 1283: debug("Trying private key: %s", id->filename);
1.191 dtucker 1284: id->key = load_identity_file(id->filename,
1285: id->userprovided);
1.117 markus 1286: if (id->key != NULL) {
1287: id->isprivate = 1;
1.200 djm 1288: if (key_type_plain(id->key->type) == KEY_RSA &&
1289: (datafellows & SSH_BUG_RSASIGMD5) != 0) {
1290: debug("Skipped %s key %s for RSA/MD5 "
1291: "server", key_type(id->key),
1292: id->filename);
1293: } else {
1294: sent = sign_and_send_pubkey(
1295: authctxt, id);
1296: }
1.117 markus 1297: key_free(id->key);
1298: id->key = NULL;
1.51 markus 1299: }
1300: }
1.117 markus 1301: if (sent)
1302: return (sent);
1.28 markus 1303: }
1.117 markus 1304: return (0);
1.20 markus 1305: }
1306:
1.23 markus 1307: /*
1308: * Send userauth request message specifying keyboard-interactive method.
1309: */
1310: int
1311: userauth_kbdint(Authctxt *authctxt)
1312: {
1313: static int attempt = 0;
1314:
1315: if (attempt++ >= options.number_of_password_prompts)
1316: return 0;
1.82 markus 1317: /* disable if no SSH2_MSG_USERAUTH_INFO_REQUEST has been seen */
1318: if (attempt > 1 && !authctxt->info_req_seen) {
1319: debug3("userauth_kbdint: disable: no info_req_seen");
1320: dispatch_set(SSH2_MSG_USERAUTH_INFO_REQUEST, NULL);
1321: return 0;
1322: }
1.23 markus 1323:
1324: debug2("userauth_kbdint");
1325: packet_start(SSH2_MSG_USERAUTH_REQUEST);
1326: packet_put_cstring(authctxt->server_user);
1327: packet_put_cstring(authctxt->service);
1328: packet_put_cstring(authctxt->method->name);
1329: packet_put_cstring(""); /* lang */
1330: packet_put_cstring(options.kbd_interactive_devices ?
1331: options.kbd_interactive_devices : "");
1332: packet_send();
1333:
1334: dispatch_set(SSH2_MSG_USERAUTH_INFO_REQUEST, &input_userauth_info_req);
1335: return 1;
1336: }
1337:
1338: /*
1.46 markus 1339: * parse INFO_REQUEST, prompt user and send INFO_RESPONSE
1.23 markus 1340: */
1341: void
1.92 markus 1342: input_userauth_info_req(int type, u_int32_t seq, void *ctxt)
1.23 markus 1343: {
1344: Authctxt *authctxt = ctxt;
1.46 markus 1345: char *name, *inst, *lang, *prompt, *response;
1.32 markus 1346: u_int num_prompts, i;
1.23 markus 1347: int echo = 0;
1348:
1349: debug2("input_userauth_info_req");
1350:
1351: if (authctxt == NULL)
1352: fatal("input_userauth_info_req: no authentication context");
1.82 markus 1353:
1354: authctxt->info_req_seen = 1;
1.23 markus 1355:
1356: name = packet_get_string(NULL);
1357: inst = packet_get_string(NULL);
1358: lang = packet_get_string(NULL);
1359: if (strlen(name) > 0)
1.116 itojun 1360: logit("%s", name);
1.23 markus 1361: if (strlen(inst) > 0)
1.116 itojun 1362: logit("%s", inst);
1.197 djm 1363: free(name);
1364: free(inst);
1365: free(lang);
1.23 markus 1366:
1367: num_prompts = packet_get_int();
1368: /*
1369: * Begin to build info response packet based on prompts requested.
1370: * We commit to providing the correct number of responses, so if
1371: * further on we run into a problem that prevents this, we have to
1372: * be sure and clean this up and send a correct error response.
1373: */
1374: packet_start(SSH2_MSG_USERAUTH_INFO_RESPONSE);
1375: packet_put_int(num_prompts);
1376:
1.73 markus 1377: debug2("input_userauth_info_req: num_prompts %d", num_prompts);
1.23 markus 1378: for (i = 0; i < num_prompts; i++) {
1379: prompt = packet_get_string(NULL);
1380: echo = packet_get_char();
1381:
1.77 markus 1382: response = read_passphrase(prompt, echo ? RP_ECHO : 0);
1.23 markus 1383:
1.49 markus 1384: packet_put_cstring(response);
1.204 djm 1385: explicit_bzero(response, strlen(response));
1.197 djm 1386: free(response);
1387: free(prompt);
1.23 markus 1388: }
1.90 markus 1389: packet_check_eom(); /* done with parsing incoming message. */
1.23 markus 1390:
1.85 markus 1391: packet_add_padding(64);
1.23 markus 1392: packet_send();
1.68 markus 1393: }
1394:
1.100 markus 1395: static int
1.105 deraadt 1396: ssh_keysign(Key *key, u_char **sigp, u_int *lenp,
1.100 markus 1397: u_char *data, u_int datalen)
1398: {
1399: Buffer b;
1.101 markus 1400: struct stat st;
1.100 markus 1401: pid_t pid;
1.103 markus 1402: int to[2], from[2], status, version = 2;
1.100 markus 1403:
1.109 markus 1404: debug2("ssh_keysign called");
1.100 markus 1405:
1.101 markus 1406: if (stat(_PATH_SSH_KEY_SIGN, &st) < 0) {
1.179 dtucker 1407: error("ssh_keysign: not installed: %s", strerror(errno));
1.101 markus 1408: return -1;
1409: }
1.100 markus 1410: if (fflush(stdout) != 0)
1411: error("ssh_keysign: fflush: %s", strerror(errno));
1412: if (pipe(to) < 0) {
1413: error("ssh_keysign: pipe: %s", strerror(errno));
1414: return -1;
1415: }
1416: if (pipe(from) < 0) {
1417: error("ssh_keysign: pipe: %s", strerror(errno));
1418: return -1;
1419: }
1420: if ((pid = fork()) < 0) {
1421: error("ssh_keysign: fork: %s", strerror(errno));
1422: return -1;
1423: }
1424: if (pid == 0) {
1.174 dtucker 1425: /* keep the socket on exec */
1426: fcntl(packet_get_connection_in(), F_SETFD, 0);
1.155 markus 1427: permanently_drop_suid(getuid());
1.100 markus 1428: close(from[0]);
1429: if (dup2(from[1], STDOUT_FILENO) < 0)
1430: fatal("ssh_keysign: dup2: %s", strerror(errno));
1431: close(to[1]);
1432: if (dup2(to[0], STDIN_FILENO) < 0)
1433: fatal("ssh_keysign: dup2: %s", strerror(errno));
1.103 markus 1434: close(from[1]);
1435: close(to[0]);
1.102 markus 1436: execl(_PATH_SSH_KEY_SIGN, _PATH_SSH_KEY_SIGN, (char *) 0);
1.100 markus 1437: fatal("ssh_keysign: exec(%s): %s", _PATH_SSH_KEY_SIGN,
1438: strerror(errno));
1439: }
1440: close(from[1]);
1441: close(to[0]);
1442:
1443: buffer_init(&b);
1.103 markus 1444: buffer_put_int(&b, packet_get_connection_in()); /* send # of socket */
1.100 markus 1445: buffer_put_string(&b, data, datalen);
1.131 djm 1446: if (ssh_msg_send(to[1], version, &b) == -1)
1447: fatal("ssh_keysign: couldn't send request");
1.100 markus 1448:
1.110 djm 1449: if (ssh_msg_recv(from[0], &b) < 0) {
1.101 markus 1450: error("ssh_keysign: no reply");
1.134 markus 1451: buffer_free(&b);
1.100 markus 1452: return -1;
1453: }
1.101 markus 1454: close(from[0]);
1455: close(to[1]);
1456:
1.103 markus 1457: while (waitpid(pid, &status, 0) < 0)
1458: if (errno != EINTR)
1459: break;
1.101 markus 1460:
1.100 markus 1461: if (buffer_get_char(&b) != version) {
1.101 markus 1462: error("ssh_keysign: bad version");
1.134 markus 1463: buffer_free(&b);
1.100 markus 1464: return -1;
1465: }
1466: *sigp = buffer_get_string(&b, lenp);
1.134 markus 1467: buffer_free(&b);
1.100 markus 1468:
1469: return 0;
1470: }
1471:
1.68 markus 1472: int
1473: userauth_hostbased(Authctxt *authctxt)
1474: {
1475: Key *private = NULL;
1.100 markus 1476: Sensitive *sensitive = authctxt->sensitive;
1.68 markus 1477: Buffer b;
1478: u_char *signature, *blob;
1.179 dtucker 1479: char *chost, *pkalg, *p;
1.72 markus 1480: const char *service;
1.68 markus 1481: u_int blen, slen;
1.176 dtucker 1482: int ok, i, found = 0;
1.68 markus 1483:
1484: /* check for a useful key */
1.100 markus 1485: for (i = 0; i < sensitive->nkeys; i++) {
1486: private = sensitive->keys[i];
1.68 markus 1487: if (private && private->type != KEY_RSA1) {
1488: found = 1;
1489: /* we take and free the key */
1.100 markus 1490: sensitive->keys[i] = NULL;
1.68 markus 1491: break;
1492: }
1493: }
1494: if (!found) {
1.109 markus 1495: debug("No more client hostkeys for hostbased authentication.");
1.68 markus 1496: return 0;
1497: }
1498: if (key_to_blob(private, &blob, &blen) == 0) {
1499: key_free(private);
1500: return 0;
1501: }
1.84 markus 1502: /* figure out a name for the client host */
1.179 dtucker 1503: p = get_local_name(packet_get_connection_in());
1.84 markus 1504: if (p == NULL) {
1505: error("userauth_hostbased: cannot get local ipaddr/name");
1506: key_free(private);
1.197 djm 1507: free(blob);
1.84 markus 1508: return 0;
1509: }
1.150 djm 1510: xasprintf(&chost, "%s.", p);
1.84 markus 1511: debug2("userauth_hostbased: chost %s", chost);
1.197 djm 1512: free(p);
1.84 markus 1513:
1.72 markus 1514: service = datafellows & SSH_BUG_HBSERVICE ? "ssh-userauth" :
1515: authctxt->service;
1.68 markus 1516: pkalg = xstrdup(key_ssh_name(private));
1517: buffer_init(&b);
1518: /* construct data */
1.72 markus 1519: buffer_put_string(&b, session_id2, session_id2_len);
1.68 markus 1520: buffer_put_char(&b, SSH2_MSG_USERAUTH_REQUEST);
1521: buffer_put_cstring(&b, authctxt->server_user);
1.72 markus 1522: buffer_put_cstring(&b, service);
1.68 markus 1523: buffer_put_cstring(&b, authctxt->method->name);
1524: buffer_put_cstring(&b, pkalg);
1525: buffer_put_string(&b, blob, blen);
1526: buffer_put_cstring(&b, chost);
1527: buffer_put_cstring(&b, authctxt->local_user);
1528: #ifdef DEBUG_PK
1529: buffer_dump(&b);
1530: #endif
1.100 markus 1531: if (sensitive->external_keysign)
1532: ok = ssh_keysign(private, &signature, &slen,
1533: buffer_ptr(&b), buffer_len(&b));
1534: else
1535: ok = key_sign(private, &signature, &slen,
1536: buffer_ptr(&b), buffer_len(&b));
1.68 markus 1537: key_free(private);
1538: buffer_free(&b);
1539: if (ok != 0) {
1540: error("key_sign failed");
1.197 djm 1541: free(chost);
1542: free(pkalg);
1543: free(blob);
1.68 markus 1544: return 0;
1545: }
1546: packet_start(SSH2_MSG_USERAUTH_REQUEST);
1547: packet_put_cstring(authctxt->server_user);
1548: packet_put_cstring(authctxt->service);
1549: packet_put_cstring(authctxt->method->name);
1550: packet_put_cstring(pkalg);
1551: packet_put_string(blob, blen);
1552: packet_put_cstring(chost);
1553: packet_put_cstring(authctxt->local_user);
1554: packet_put_string(signature, slen);
1.204 djm 1555: explicit_bzero(signature, slen);
1.197 djm 1556: free(signature);
1557: free(chost);
1558: free(pkalg);
1559: free(blob);
1.68 markus 1560:
1561: packet_send();
1562: return 1;
1.23 markus 1563: }
1.170 djm 1564:
1.20 markus 1565: /* find auth method */
1566:
1567: /*
1568: * given auth method name, if configurable options permit this method fill
1569: * in auth_ident field and return true, otherwise return false.
1570: */
1.76 itojun 1571: static int
1.20 markus 1572: authmethod_is_enabled(Authmethod *method)
1573: {
1574: if (method == NULL)
1575: return 0;
1576: /* return false if options indicate this method is disabled */
1577: if (method->enabled == NULL || *method->enabled == 0)
1578: return 0;
1579: /* return false if batch mode is enabled but method needs interactive mode */
1580: if (method->batch_flag != NULL && *method->batch_flag != 0)
1581: return 0;
1582: return 1;
1583: }
1584:
1.76 itojun 1585: static Authmethod *
1.20 markus 1586: authmethod_lookup(const char *name)
1.1 markus 1587: {
1.20 markus 1588: Authmethod *method = NULL;
1589: if (name != NULL)
1590: for (method = authmethods; method->name != NULL; method++)
1591: if (strcmp(name, method->name) == 0)
1592: return method;
1593: debug2("Unrecognized authentication method name: %s", name ? name : "NULL");
1594: return NULL;
1595: }
1.1 markus 1596:
1.53 markus 1597: /* XXX internal state */
1598: static Authmethod *current = NULL;
1599: static char *supported = NULL;
1600: static char *preferred = NULL;
1.105 deraadt 1601:
1.20 markus 1602: /*
1603: * Given the authentication method list sent by the server, return the
1604: * next method we should try. If the server initially sends a nil list,
1.67 markus 1605: * use a built-in default list.
1.41 stevesk 1606: */
1.76 itojun 1607: static Authmethod *
1.20 markus 1608: authmethod_get(char *authlist)
1609: {
1.53 markus 1610: char *name = NULL;
1.97 markus 1611: u_int next;
1.41 stevesk 1612:
1.20 markus 1613: /* Use a suitable default if we're passed a nil list. */
1614: if (authlist == NULL || strlen(authlist) == 0)
1.53 markus 1615: authlist = options.preferred_authentications;
1.20 markus 1616:
1.53 markus 1617: if (supported == NULL || strcmp(authlist, supported) != 0) {
1618: debug3("start over, passed a different list %s", authlist);
1.197 djm 1619: free(supported);
1.53 markus 1620: supported = xstrdup(authlist);
1621: preferred = options.preferred_authentications;
1622: debug3("preferred %s", preferred);
1623: current = NULL;
1624: } else if (current != NULL && authmethod_is_enabled(current))
1625: return current;
1.20 markus 1626:
1.53 markus 1627: for (;;) {
1628: if ((name = match_list(preferred, supported, &next)) == NULL) {
1.109 markus 1629: debug("No more authentication methods to try.");
1.53 markus 1630: current = NULL;
1631: return NULL;
1632: }
1633: preferred += next;
1.23 markus 1634: debug3("authmethod_lookup %s", name);
1.53 markus 1635: debug3("remaining preferred: %s", preferred);
1636: if ((current = authmethod_lookup(name)) != NULL &&
1637: authmethod_is_enabled(current)) {
1.23 markus 1638: debug3("authmethod_is_enabled %s", name);
1.109 markus 1639: debug("Next authentication method: %s", name);
1.197 djm 1640: free(name);
1.53 markus 1641: return current;
1.23 markus 1642: }
1.198 dtucker 1643: free(name);
1.1 markus 1644: }
1.53 markus 1645: }
1.1 markus 1646:
1.79 stevesk 1647: static char *
1.53 markus 1648: authmethods_get(void)
1649: {
1650: Authmethod *method = NULL;
1.93 markus 1651: Buffer b;
1652: char *list;
1.27 provos 1653:
1.93 markus 1654: buffer_init(&b);
1.53 markus 1655: for (method = authmethods; method->name != NULL; method++) {
1656: if (authmethod_is_enabled(method)) {
1.93 markus 1657: if (buffer_len(&b) > 0)
1658: buffer_append(&b, ",", 1);
1659: buffer_append(&b, method->name, strlen(method->name));
1.53 markus 1660: }
1661: }
1.93 markus 1662: buffer_append(&b, "\0", 1);
1663: list = xstrdup(buffer_ptr(&b));
1664: buffer_free(&b);
1665: return list;
1.1 markus 1666: }
1.170 djm 1667:
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