Annotation of src/usr.bin/ssh/sshconnect2.c, Revision 1.292
1.292 ! djm 1: /* $OpenBSD: sshconnect2.c,v 1.291 2018/12/27 03:25:25 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"
1.278 markus 46: #include "sshbuf.h"
1.1 markus 47: #include "packet.h"
48: #include "compat.h"
1.37 markus 49: #include "cipher.h"
1.278 markus 50: #include "sshkey.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"
1.246 djm 68: #include "utf8.h"
1.22 provos 69:
1.121 markus 70: #ifdef GSSAPI
71: #include "ssh-gss.h"
72: #endif
73:
1.1 markus 74: /* import */
75: extern char *client_version_string;
76: extern char *server_version_string;
77: extern Options options;
78:
79: /*
80: * SSH2 key exchange
81: */
82:
1.32 markus 83: u_char *session_id2 = NULL;
1.120 markus 84: u_int session_id2_len = 0;
1.1 markus 85:
1.61 markus 86: char *xxx_host;
87: struct sockaddr *xxx_hostaddr;
88:
1.76 itojun 89: static int
1.259 markus 90: verify_host_key_callback(struct sshkey *hostkey, struct ssh *ssh)
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') {
1.214 djm 128: if ((ktype = sshkey_type_from_name(alg)) == KEY_UNSPEC)
1.186 djm 129: fatal("%s: unknown alg %s", __func__, alg);
130: if (lookup_key_in_hostkeys_by_type(hostkeys,
1.214 djm 131: sshkey_type_plain(ktype), NULL))
1.186 djm 132: ALG_APPEND(first, alg);
133: else
134: ALG_APPEND(last, alg);
135: }
136: #undef ALG_APPEND
1.216 djm 137: xasprintf(&ret, "%s%s%s", first,
138: (*first == '\0' || *last == '\0') ? "" : ",", last);
1.186 djm 139: if (*first != '\0')
140: debug3("%s: prefer hostkeyalgs: %s", __func__, first);
141:
1.197 djm 142: free(first);
143: free(last);
144: free(hostname);
145: free(oavail);
1.186 djm 146: free_hostkeys(hostkeys);
147:
148: return ret;
149: }
150:
1.1 markus 151: void
1.291 djm 152: ssh_kex2(struct ssh *ssh, char *host, struct sockaddr *hostaddr, u_short port)
1.22 provos 153: {
1.205 markus 154: char *myproposal[PROPOSAL_MAX] = { KEX_CLIENT };
1.275 djm 155: char *s, *all_key;
1.221 markus 156: int r;
1.61 markus 157:
158: xxx_host = host;
159: xxx_hostaddr = hostaddr;
1.22 provos 160:
1.231 markus 161: if ((s = kex_names_cat(options.kex_algorithms, "ext-info-c")) == NULL)
162: fatal("%s: kex_names_cat", __func__);
1.284 djm 163: myproposal[PROPOSAL_KEX_ALGS] = compat_kex_proposal(s);
1.60 stevesk 164: myproposal[PROPOSAL_ENC_ALGS_CTOS] =
1.284 djm 165: compat_cipher_proposal(options.ciphers);
1.60 stevesk 166: myproposal[PROPOSAL_ENC_ALGS_STOC] =
1.284 djm 167: compat_cipher_proposal(options.ciphers);
1.245 dtucker 168: myproposal[PROPOSAL_COMP_ALGS_CTOS] =
169: myproposal[PROPOSAL_COMP_ALGS_STOC] = options.compression ?
1.277 sf 170: "zlib@openssh.com,zlib,none" : "none,zlib@openssh.com,zlib";
1.226 djm 171: myproposal[PROPOSAL_MAC_ALGS_CTOS] =
172: myproposal[PROPOSAL_MAC_ALGS_STOC] = options.macs;
173: if (options.hostkeyalgorithms != NULL) {
1.275 djm 174: all_key = sshkey_alg_list(0, 0, 1, ',');
175: if (kex_assemble_names(&options.hostkeyalgorithms,
176: KEX_DEFAULT_PK_ALG, all_key) != 0)
1.226 djm 177: fatal("%s: kex_assemble_namelist", __func__);
1.275 djm 178: free(all_key);
1.88 deraadt 179: myproposal[PROPOSAL_SERVER_HOST_KEY_ALGS] =
1.284 djm 180: compat_pkalg_proposal(options.hostkeyalgorithms);
1.226 djm 181: } else {
1.225 markus 182: /* Enforce default */
183: options.hostkeyalgorithms = xstrdup(KEX_DEFAULT_PK_ALG);
1.186 djm 184: /* Prefer algorithms that we already have keys for */
185: myproposal[PROPOSAL_SERVER_HOST_KEY_ALGS] =
1.200 djm 186: compat_pkalg_proposal(
1.284 djm 187: order_hostkeyalgs(host, hostaddr, port));
1.186 djm 188: }
1.115 markus 189:
1.196 dtucker 190: if (options.rekey_limit || options.rekey_interval)
1.254 dtucker 191: packet_set_rekey_limits(options.rekey_limit,
192: options.rekey_interval);
1.22 provos 193:
1.65 markus 194: /* start key exchange */
1.291 djm 195: if ((r = kex_setup(ssh, myproposal)) != 0)
1.221 markus 196: fatal("kex_setup: %s", ssh_err(r));
1.207 markus 197: #ifdef WITH_OPENSSL
1.291 djm 198: ssh->kex->kex[KEX_DH_GRP1_SHA1] = kexdh_client;
199: ssh->kex->kex[KEX_DH_GRP14_SHA1] = kexdh_client;
200: ssh->kex->kex[KEX_DH_GRP14_SHA256] = kexdh_client;
201: ssh->kex->kex[KEX_DH_GRP16_SHA512] = kexdh_client;
202: ssh->kex->kex[KEX_DH_GRP18_SHA512] = kexdh_client;
203: ssh->kex->kex[KEX_DH_GEX_SHA1] = kexgex_client;
204: ssh->kex->kex[KEX_DH_GEX_SHA256] = kexgex_client;
205: ssh->kex->kex[KEX_ECDH_SHA2] = kexecdh_client;
1.207 markus 206: #endif
1.291 djm 207: ssh->kex->kex[KEX_C25519_SHA256] = kexc25519_client;
208: ssh->kex->verify_host_key=&verify_host_key_callback;
1.22 provos 209:
1.291 djm 210: ssh_dispatch_run_fatal(ssh, DISPATCH_BLOCK, &ssh->kex->done);
1.173 andreas 211:
1.231 markus 212: /* remove ext-info from the KEX proposals for rekeying */
213: myproposal[PROPOSAL_KEX_ALGS] =
1.284 djm 214: compat_kex_proposal(options.kex_algorithms);
1.291 djm 215: if ((r = kex_prop2buf(ssh->kex->my, myproposal)) != 0)
1.231 markus 216: fatal("kex_prop2buf: %s", ssh_err(r));
1.62 markus 217:
1.291 djm 218: session_id2 = ssh->kex->session_id;
219: session_id2_len = ssh->kex->session_id_len;
1.22 provos 220:
221: #ifdef DEBUG_KEXDH
222: /* send 1st encrypted/maced/compressed message */
1.278 markus 223: if ((r = sshpkt_start(ssh, SSH2_MSG_IGNORE)) != 0 ||
224: (r = sshpkt_put_cstring(ssh, "markus")) != 0 ||
1.280 markus 225: (r = sshpkt_send(ssh)) != 0 ||
226: (r = ssh_packet_write_wait(ssh)) != 0)
1.278 markus 227: fatal("%s: %s", __func__, ssh_err(r));
1.22 provos 228: #endif
1.1 markus 229: }
1.11 markus 230:
1.1 markus 231: /*
232: * Authenticate user
233: */
1.20 markus 234:
1.214 djm 235: typedef struct cauthctxt Authctxt;
236: typedef struct cauthmethod Authmethod;
1.117 markus 237: typedef struct identity Identity;
238: typedef struct idlist Idlist;
1.20 markus 239:
1.117 markus 240: struct identity {
241: TAILQ_ENTRY(identity) next;
1.214 djm 242: int agent_fd; /* >=0 if agent supports key */
243: struct sshkey *key; /* public/private key */
1.117 markus 244: char *filename; /* comment for agent-only keys */
245: int tried;
246: int isprivate; /* key points to the private key */
1.191 dtucker 247: int userprovided;
1.117 markus 248: };
249: TAILQ_HEAD(idlist, identity);
1.20 markus 250:
1.214 djm 251: struct cauthctxt {
1.20 markus 252: const char *server_user;
1.68 markus 253: const char *local_user;
1.20 markus 254: const char *host;
255: const char *service;
1.214 djm 256: struct cauthmethod *method;
1.183 djm 257: sig_atomic_t success;
1.51 markus 258: char *authlist;
1.68 markus 259: /* pubkey */
1.214 djm 260: struct idlist keys;
261: int agent_fd;
1.68 markus 262: /* hostbased */
1.100 markus 263: Sensitive *sensitive;
1.223 djm 264: char *oktypes, *ktypes;
265: const char *active_ktype;
1.82 markus 266: /* kbd-interactive */
267: int info_req_seen;
1.292 ! djm 268: int attempt_kbdint;
! 269: /* password */
! 270: int attempt_passwd;
1.121 markus 271: /* generic */
272: void *methoddata;
1.20 markus 273: };
1.214 djm 274:
275: struct cauthmethod {
1.20 markus 276: char *name; /* string to compare against server's list */
277: int (*userauth)(Authctxt *authctxt);
1.170 djm 278: void (*cleanup)(Authctxt *authctxt);
1.20 markus 279: int *enabled; /* flag in option struct that enables method */
280: int *batch_flag; /* flag in option struct that disables method */
281: };
282:
1.261 markus 283: int input_userauth_service_accept(int, u_int32_t, struct ssh *);
284: int input_userauth_ext_info(int, u_int32_t, struct ssh *);
285: int input_userauth_success(int, u_int32_t, struct ssh *);
286: int input_userauth_success_unexpected(int, u_int32_t, struct ssh *);
287: int input_userauth_failure(int, u_int32_t, struct ssh *);
288: int input_userauth_banner(int, u_int32_t, struct ssh *);
289: int input_userauth_error(int, u_int32_t, struct ssh *);
290: int input_userauth_info_req(int, u_int32_t, struct ssh *);
291: int input_userauth_pk_ok(int, u_int32_t, struct ssh *);
292: int input_userauth_passwd_changereq(int, u_int32_t, struct ssh *);
1.86 itojun 293:
294: int userauth_none(Authctxt *);
295: int userauth_pubkey(Authctxt *);
296: int userauth_passwd(Authctxt *);
297: int userauth_kbdint(Authctxt *);
298: int userauth_hostbased(Authctxt *);
1.20 markus 299:
1.121 markus 300: #ifdef GSSAPI
301: int userauth_gssapi(Authctxt *authctxt);
1.261 markus 302: int input_gssapi_response(int type, u_int32_t, struct ssh *);
303: int input_gssapi_token(int type, u_int32_t, struct ssh *);
304: int input_gssapi_hash(int type, u_int32_t, struct ssh *);
305: int input_gssapi_error(int, u_int32_t, struct ssh *);
306: int input_gssapi_errtok(int, u_int32_t, struct ssh *);
1.121 markus 307: #endif
308:
1.86 itojun 309: void userauth(Authctxt *, char *);
1.51 markus 310:
1.272 djm 311: static int sign_and_send_pubkey(struct ssh *ssh, Authctxt *, Identity *);
1.117 markus 312: static void pubkey_prepare(Authctxt *);
313: static void pubkey_cleanup(Authctxt *);
1.251 djm 314: static void pubkey_reset(Authctxt *);
1.259 markus 315: static struct sshkey *load_identity_file(Identity *);
1.76 itojun 316:
317: static Authmethod *authmethod_get(char *authlist);
318: static Authmethod *authmethod_lookup(const char *name);
319: static char *authmethods_get(void);
1.20 markus 320:
321: Authmethod authmethods[] = {
1.121 markus 322: #ifdef GSSAPI
1.132 markus 323: {"gssapi-with-mic",
1.121 markus 324: userauth_gssapi,
1.170 djm 325: NULL,
1.121 markus 326: &options.gss_authentication,
327: NULL},
328: #endif
1.81 markus 329: {"hostbased",
330: userauth_hostbased,
1.170 djm 331: NULL,
1.81 markus 332: &options.hostbased_authentication,
333: NULL},
1.20 markus 334: {"publickey",
335: userauth_pubkey,
1.170 djm 336: NULL,
1.28 markus 337: &options.pubkey_authentication,
1.20 markus 338: NULL},
1.81 markus 339: {"keyboard-interactive",
340: userauth_kbdint,
1.170 djm 341: NULL,
1.81 markus 342: &options.kbd_interactive_authentication,
343: &options.batch_mode},
1.20 markus 344: {"password",
345: userauth_passwd,
1.170 djm 346: NULL,
1.20 markus 347: &options.password_authentication,
1.23 markus 348: &options.batch_mode},
349: {"none",
350: userauth_none,
351: NULL,
1.170 djm 352: NULL,
1.23 markus 353: NULL},
1.170 djm 354: {NULL, NULL, NULL, NULL, NULL}
1.20 markus 355: };
356:
357: void
1.291 djm 358: ssh_userauth2(struct ssh *ssh, const char *local_user,
359: const char *server_user, char *host, Sensitive *sensitive)
1.20 markus 360: {
361: Authctxt authctxt;
1.231 markus 362: int r;
1.39 markus 363:
1.73 markus 364: if (options.challenge_response_authentication)
1.39 markus 365: options.kbd_interactive_authentication = 1;
1.53 markus 366: if (options.preferred_authentications == NULL)
367: options.preferred_authentications = authmethods_get();
368:
1.20 markus 369: /* setup authentication context */
1.82 markus 370: memset(&authctxt, 0, sizeof(authctxt));
1.20 markus 371: authctxt.server_user = server_user;
1.68 markus 372: authctxt.local_user = local_user;
1.20 markus 373: authctxt.host = host;
374: authctxt.service = "ssh-connection"; /* service name */
375: authctxt.success = 0;
1.23 markus 376: authctxt.method = authmethod_lookup("none");
1.51 markus 377: authctxt.authlist = NULL;
1.121 markus 378: authctxt.methoddata = NULL;
1.100 markus 379: authctxt.sensitive = sensitive;
1.223 djm 380: authctxt.active_ktype = authctxt.oktypes = authctxt.ktypes = NULL;
1.82 markus 381: authctxt.info_req_seen = 0;
1.292 ! djm 382: authctxt.attempt_kbdint = 0;
! 383: authctxt.attempt_passwd = 0;
1.215 djm 384: authctxt.agent_fd = -1;
1.289 djm 385: pubkey_prepare(&authctxt);
1.291 djm 386: if (authctxt.method == NULL) {
387: fatal("%s: internal error: cannot send userauth none request",
388: __func__);
389: }
1.20 markus 390:
1.231 markus 391: if ((r = sshpkt_start(ssh, SSH2_MSG_SERVICE_REQUEST)) != 0 ||
392: (r = sshpkt_put_cstring(ssh, "ssh-userauth")) != 0 ||
393: (r = sshpkt_send(ssh)) != 0)
394: fatal("%s: %s", __func__, ssh_err(r));
395:
1.260 markus 396: ssh->authctxt = &authctxt;
1.231 markus 397: ssh_dispatch_init(ssh, &input_userauth_error);
398: ssh_dispatch_set(ssh, SSH2_MSG_EXT_INFO, &input_userauth_ext_info);
399: ssh_dispatch_set(ssh, SSH2_MSG_SERVICE_ACCEPT, &input_userauth_service_accept);
1.263 markus 400: ssh_dispatch_run_fatal(ssh, DISPATCH_BLOCK, &authctxt.success); /* loop until success */
1.260 markus 401: ssh->authctxt = NULL;
1.20 markus 402:
1.117 markus 403: pubkey_cleanup(&authctxt);
1.231 markus 404: ssh_dispatch_range(ssh, SSH2_MSG_USERAUTH_MIN, SSH2_MSG_USERAUTH_MAX, NULL);
1.119 markus 405:
1.248 dtucker 406: if (!authctxt.success)
407: fatal("Authentication failed.");
1.109 markus 408: debug("Authentication succeeded (%s).", authctxt.method->name);
1.20 markus 409: }
1.119 markus 410:
1.231 markus 411: /* ARGSUSED */
412: int
1.261 markus 413: input_userauth_service_accept(int type, u_int32_t seq, struct ssh *ssh)
1.231 markus 414: {
1.260 markus 415: Authctxt *authctxt = ssh->authctxt;
1.231 markus 416: int r;
417:
418: if (ssh_packet_remaining(ssh) > 0) {
419: char *reply;
420:
421: if ((r = sshpkt_get_cstring(ssh, &reply, NULL)) != 0)
422: goto out;
423: debug2("service_accept: %s", reply);
424: free(reply);
425: } else {
426: debug2("buggy server: service_accept w/o service");
427: }
428: if ((r = sshpkt_get_end(ssh)) != 0)
429: goto out;
430: debug("SSH2_MSG_SERVICE_ACCEPT received");
431:
432: /* initial userauth request */
433: userauth_none(authctxt);
434:
435: ssh_dispatch_set(ssh, SSH2_MSG_EXT_INFO, &input_userauth_error);
436: ssh_dispatch_set(ssh, SSH2_MSG_USERAUTH_SUCCESS, &input_userauth_success);
437: ssh_dispatch_set(ssh, SSH2_MSG_USERAUTH_FAILURE, &input_userauth_failure);
438: ssh_dispatch_set(ssh, SSH2_MSG_USERAUTH_BANNER, &input_userauth_banner);
439: r = 0;
440: out:
441: return r;
442: }
443:
444: /* ARGSUSED */
445: int
1.261 markus 446: input_userauth_ext_info(int type, u_int32_t seqnr, struct ssh *ssh)
1.231 markus 447: {
1.261 markus 448: return kex_input_ext_info(type, seqnr, ssh);
1.231 markus 449: }
450:
1.20 markus 451: void
1.51 markus 452: userauth(Authctxt *authctxt, char *authlist)
453: {
1.278 markus 454: struct ssh *ssh = active_state; /* XXX */
455:
1.170 djm 456: if (authctxt->method != NULL && authctxt->method->cleanup != NULL)
457: authctxt->method->cleanup(authctxt);
458:
1.197 djm 459: free(authctxt->methoddata);
460: authctxt->methoddata = NULL;
1.51 markus 461: if (authlist == NULL) {
462: authlist = authctxt->authlist;
463: } else {
1.197 djm 464: free(authctxt->authlist);
1.51 markus 465: authctxt->authlist = authlist;
466: }
467: for (;;) {
468: Authmethod *method = authmethod_get(authlist);
469: if (method == NULL)
1.264 dtucker 470: fatal("%s@%s: Permission denied (%s).",
471: authctxt->server_user, authctxt->host, authlist);
1.51 markus 472: authctxt->method = method;
1.119 markus 473:
474: /* reset the per method handler */
1.278 markus 475: ssh_dispatch_range(ssh, SSH2_MSG_USERAUTH_PER_METHOD_MIN,
1.119 markus 476: SSH2_MSG_USERAUTH_PER_METHOD_MAX, NULL);
477:
478: /* and try new method */
1.51 markus 479: if (method->userauth(authctxt) != 0) {
480: debug2("we sent a %s packet, wait for reply", method->name);
481: break;
482: } else {
483: debug2("we did not send a packet, disable method");
484: method->enabled = NULL;
485: }
486: }
487: }
1.105 deraadt 488:
1.169 djm 489: /* ARGSUSED */
1.218 markus 490: int
1.261 markus 491: input_userauth_error(int type, u_int32_t seq, struct ssh *ssh)
1.20 markus 492: {
1.35 markus 493: fatal("input_userauth_error: bad message during authentication: "
1.140 djm 494: "type %d", type);
1.218 markus 495: return 0;
1.35 markus 496: }
1.105 deraadt 497:
1.169 djm 498: /* ARGSUSED */
1.218 markus 499: int
1.261 markus 500: input_userauth_banner(int type, u_int32_t seq, struct ssh *ssh)
1.35 markus 501: {
1.246 djm 502: char *msg, *lang;
1.166 djm 503: u_int len;
1.126 deraadt 504:
1.246 djm 505: debug3("%s", __func__);
506: msg = packet_get_string(&len);
1.35 markus 507: lang = packet_get_string(NULL);
1.246 djm 508: if (len > 0 && options.log_level >= SYSLOG_LEVEL_INFO)
509: fmprintf(stderr, "%s", msg);
510: free(msg);
1.197 djm 511: free(lang);
1.218 markus 512: return 0;
1.20 markus 513: }
1.105 deraadt 514:
1.169 djm 515: /* ARGSUSED */
1.218 markus 516: int
1.261 markus 517: input_userauth_success(int type, u_int32_t seq, struct ssh *ssh)
1.20 markus 518: {
1.260 markus 519: Authctxt *authctxt = ssh->authctxt;
1.172 djm 520:
1.20 markus 521: if (authctxt == NULL)
522: fatal("input_userauth_success: no authentication context");
1.197 djm 523: free(authctxt->authlist);
524: authctxt->authlist = NULL;
1.172 djm 525: if (authctxt->method != NULL && authctxt->method->cleanup != NULL)
526: authctxt->method->cleanup(authctxt);
1.197 djm 527: free(authctxt->methoddata);
528: authctxt->methoddata = NULL;
1.20 markus 529: authctxt->success = 1; /* break out */
1.218 markus 530: return 0;
1.20 markus 531: }
1.105 deraadt 532:
1.218 markus 533: int
1.261 markus 534: input_userauth_success_unexpected(int type, u_int32_t seq, struct ssh *ssh)
1.172 djm 535: {
1.260 markus 536: Authctxt *authctxt = ssh->authctxt;
1.172 djm 537:
538: if (authctxt == NULL)
539: fatal("%s: no authentication context", __func__);
540:
541: fatal("Unexpected authentication success during %s.",
542: authctxt->method->name);
1.218 markus 543: return 0;
1.172 djm 544: }
545:
1.169 djm 546: /* ARGSUSED */
1.218 markus 547: int
1.261 markus 548: input_userauth_failure(int type, u_int32_t seq, struct ssh *ssh)
1.20 markus 549: {
1.260 markus 550: Authctxt *authctxt = ssh->authctxt;
1.20 markus 551: char *authlist = NULL;
1.278 markus 552: u_char partial;
553: int r;
1.20 markus 554:
555: if (authctxt == NULL)
556: fatal("input_userauth_failure: no authentication context");
557:
1.278 markus 558: if ((r = sshpkt_get_cstring(ssh, &authlist, NULL)) != 0 ||
559: (r = sshpkt_get_u8(ssh, &partial)) != 0 ||
560: (r = sshpkt_get_end(ssh)) != 0)
561: goto out;
1.20 markus 562:
1.193 markus 563: if (partial != 0) {
1.247 dtucker 564: verbose("Authenticated with partial success.");
1.193 markus 565: /* reset state */
1.251 djm 566: pubkey_reset(authctxt);
1.193 markus 567: }
1.109 markus 568: debug("Authentications that can continue: %s", authlist);
1.20 markus 569:
1.51 markus 570: userauth(authctxt, authlist);
1.278 markus 571: authlist = NULL;
572: out:
573: free(authlist);
1.218 markus 574: return 0;
1.51 markus 575: }
1.169 djm 576:
1.287 djm 577: /*
578: * Format an identity for logging including filename, key type, fingerprint
579: * and location (agent, etc.). Caller must free.
580: */
581: static char *
582: format_identity(Identity *id)
583: {
584: char *fp = NULL, *ret = NULL;
585:
586: if (id->key != NULL) {
587: fp = sshkey_fingerprint(id->key, options.fingerprint_hash,
588: SSH_FP_DEFAULT);
589: }
590: xasprintf(&ret, "%s %s%s%s%s%s%s",
591: id->filename,
592: id->key ? sshkey_type(id->key) : "", id->key ? " " : "",
593: fp ? fp : "",
594: id->userprovided ? " explicit" : "",
595: (id->key && (id->key->flags & SSHKEY_FLAG_EXT)) ? " token" : "",
596: id->agent_fd != -1 ? " agent" : "");
597: free(fp);
598: return ret;
599: }
600:
1.169 djm 601: /* ARGSUSED */
1.218 markus 602: int
1.261 markus 603: input_userauth_pk_ok(int type, u_int32_t seq, struct ssh *ssh)
1.51 markus 604: {
1.260 markus 605: Authctxt *authctxt = ssh->authctxt;
1.259 markus 606: struct sshkey *key = NULL;
1.117 markus 607: Identity *id = NULL;
1.287 djm 608: int pktype, found = 0, sent = 0;
1.278 markus 609: size_t blen;
1.287 djm 610: char *pkalg = NULL, *fp = NULL, *ident = NULL;
1.278 markus 611: u_char *pkblob = NULL;
612: int r;
1.51 markus 613:
614: if (authctxt == NULL)
615: fatal("input_userauth_pk_ok: no authentication context");
1.267 djm 616:
1.278 markus 617: if ((r = sshpkt_get_cstring(ssh, &pkalg, NULL)) != 0 ||
618: (r = sshpkt_get_string(ssh, &pkblob, &blen)) != 0 ||
619: (r = sshpkt_get_end(ssh)) != 0)
620: goto done;
1.51 markus 621:
1.278 markus 622: if ((pktype = sshkey_type_from_name(pkalg)) == KEY_UNSPEC) {
1.287 djm 623: debug("%s: server sent unknown pkalg %s", __func__, pkalg);
1.117 markus 624: goto done;
625: }
1.278 markus 626: if ((r = sshkey_from_blob(pkblob, blen, &key)) != 0) {
627: debug("no key from blob. pkalg %s: %s", pkalg, ssh_err(r));
1.117 markus 628: goto done;
629: }
630: if (key->type != pktype) {
631: error("input_userauth_pk_ok: type mismatch "
632: "for decoded key (received %d, expected %d)",
633: key->type, pktype);
634: goto done;
635: }
636:
1.127 markus 637: /*
638: * search keys in the reverse order, because last candidate has been
639: * moved to the end of the queue. this also avoids confusion by
640: * duplicate keys
641: */
1.136 henning 642: TAILQ_FOREACH_REVERSE(id, &authctxt->keys, idlist, next) {
1.278 markus 643: if (sshkey_equal(key, id->key)) {
1.287 djm 644: found = 1;
1.51 markus 645: break;
646: }
1.117 markus 647: }
1.287 djm 648: if (!found || id == NULL) {
649: fp = sshkey_fingerprint(key, options.fingerprint_hash,
650: SSH_FP_DEFAULT);
651: error("%s: server replied with unknown key: %s %s", __func__,
652: sshkey_type(key), fp == NULL ? "<ERROR>" : fp);
653: goto done;
654: }
655: ident = format_identity(id);
656: debug("Server accepts key: %s", ident);
657: sent = sign_and_send_pubkey(ssh, authctxt, id);
1.278 markus 658: r = 0;
659: done:
660: sshkey_free(key);
1.287 djm 661: free(ident);
662: free(fp);
1.197 djm 663: free(pkalg);
664: free(pkblob);
1.51 markus 665:
1.106 deraadt 666: /* try another method if we did not send a packet */
1.278 markus 667: if (r == 0 && sent == 0)
1.51 markus 668: userauth(authctxt, NULL);
1.278 markus 669: return r;
1.20 markus 670: }
1.121 markus 671:
672: #ifdef GSSAPI
1.133 djm 673: int
1.121 markus 674: userauth_gssapi(Authctxt *authctxt)
675: {
1.278 markus 676: struct ssh *ssh = active_state; /* XXX */
1.121 markus 677: Gssctxt *gssctxt = NULL;
1.128 avsm 678: static gss_OID_set gss_supported = NULL;
1.139 djm 679: static u_int mech = 0;
1.121 markus 680: OM_uint32 min;
1.278 markus 681: int r, ok = 0;
1.121 markus 682:
683: /* Try one GSSAPI method at a time, rather than sending them all at
684: * once. */
685:
1.128 avsm 686: if (gss_supported == NULL)
687: gss_indicate_mechs(&min, &gss_supported);
1.121 markus 688:
689: /* Check to see if the mechanism is usable before we offer it */
1.128 avsm 690: while (mech < gss_supported->count && !ok) {
1.121 markus 691: /* My DER encoding requires length<128 */
1.128 avsm 692: if (gss_supported->elements[mech].length < 128 &&
1.271 djm 693: ssh_gssapi_check_mechanism(&gssctxt,
1.161 djm 694: &gss_supported->elements[mech], authctxt->host)) {
1.121 markus 695: ok = 1; /* Mechanism works */
696: } else {
697: mech++;
698: }
699: }
700:
1.161 djm 701: if (!ok)
1.139 djm 702: return 0;
1.121 markus 703:
704: authctxt->methoddata=(void *)gssctxt;
705:
1.278 markus 706: if ((r = sshpkt_start(ssh, SSH2_MSG_USERAUTH_REQUEST)) != 0 ||
707: (r = sshpkt_put_cstring(ssh, authctxt->server_user)) != 0 ||
708: (r = sshpkt_put_cstring(ssh, authctxt->service)) != 0 ||
709: (r = sshpkt_put_cstring(ssh, authctxt->method->name)) != 0 ||
710: (r = sshpkt_put_u32(ssh, 1)) != 0 ||
711: (r = sshpkt_put_u32(ssh,
712: (gss_supported->elements[mech].length) + 2)) != 0 ||
713: (r = sshpkt_put_u8(ssh, SSH_GSS_OIDTYPE)) != 0 ||
714: (r = sshpkt_put_u8(ssh,
715: gss_supported->elements[mech].length)) != 0 ||
716: (r = sshpkt_put(ssh,
717: gss_supported->elements[mech].elements,
718: gss_supported->elements[mech].length)) != 0 ||
719: (r = sshpkt_send(ssh)) != 0)
720: fatal("%s: %s", __func__, ssh_err(r));
721:
722: ssh_dispatch_set(ssh, SSH2_MSG_USERAUTH_GSSAPI_RESPONSE, &input_gssapi_response);
723: ssh_dispatch_set(ssh, SSH2_MSG_USERAUTH_GSSAPI_TOKEN, &input_gssapi_token);
724: ssh_dispatch_set(ssh, SSH2_MSG_USERAUTH_GSSAPI_ERROR, &input_gssapi_error);
725: ssh_dispatch_set(ssh, SSH2_MSG_USERAUTH_GSSAPI_ERRTOK, &input_gssapi_errtok);
1.121 markus 726:
727: mech++; /* Move along to next candidate */
728:
729: return 1;
730: }
731:
1.130 markus 732: static OM_uint32
1.262 djm 733: process_gssapi_token(struct ssh *ssh, gss_buffer_t recv_tok)
1.130 markus 734: {
1.260 markus 735: Authctxt *authctxt = ssh->authctxt;
1.130 markus 736: Gssctxt *gssctxt = authctxt->methoddata;
737: gss_buffer_desc send_tok = GSS_C_EMPTY_BUFFER;
1.142 djm 738: gss_buffer_desc mic = GSS_C_EMPTY_BUFFER;
739: gss_buffer_desc gssbuf;
1.132 markus 740: OM_uint32 status, ms, flags;
1.278 markus 741: int r;
1.133 djm 742:
1.130 markus 743: status = ssh_gssapi_init_ctx(gssctxt, options.gss_deleg_creds,
1.132 markus 744: recv_tok, &send_tok, &flags);
1.130 markus 745:
746: if (send_tok.length > 0) {
1.278 markus 747: u_char type = GSS_ERROR(status) ?
748: SSH2_MSG_USERAUTH_GSSAPI_ERRTOK :
749: SSH2_MSG_USERAUTH_GSSAPI_TOKEN;
750:
751: if ((r = sshpkt_start(ssh, type)) != 0 ||
752: (r = sshpkt_put_string(ssh, send_tok.value,
753: send_tok.length)) != 0 ||
754: (r = sshpkt_send(ssh)) != 0)
755: fatal("%s: %s", __func__, ssh_err(r));
1.133 djm 756:
1.130 markus 757: gss_release_buffer(&ms, &send_tok);
758: }
1.133 djm 759:
1.130 markus 760: if (status == GSS_S_COMPLETE) {
1.132 markus 761: /* send either complete or MIC, depending on mechanism */
762: if (!(flags & GSS_C_INTEG_FLAG)) {
1.278 markus 763: if ((r = sshpkt_start(ssh,
764: SSH2_MSG_USERAUTH_GSSAPI_EXCHANGE_COMPLETE)) != 0 ||
765: (r = sshpkt_send(ssh)) != 0)
766: fatal("%s: %s", __func__, ssh_err(r));
1.132 markus 767: } else {
1.278 markus 768: struct sshbuf *b;
769:
770: if ((b = sshbuf_new()) == NULL)
771: fatal("%s: sshbuf_new failed", __func__);
772: ssh_gssapi_buildmic(b, authctxt->server_user,
1.132 markus 773: authctxt->service, "gssapi-with-mic");
774:
1.278 markus 775: if ((gssbuf.value = sshbuf_mutable_ptr(b)) == NULL)
776: fatal("%s: sshbuf_mutable_ptr failed", __func__);
777: gssbuf.length = sshbuf_len(b);
1.133 djm 778:
1.132 markus 779: status = ssh_gssapi_sign(gssctxt, &gssbuf, &mic);
1.133 djm 780:
1.132 markus 781: if (!GSS_ERROR(status)) {
1.278 markus 782: if ((r = sshpkt_start(ssh,
783: SSH2_MSG_USERAUTH_GSSAPI_MIC)) != 0 ||
784: (r = sshpkt_put_string(ssh, mic.value,
785: mic.length)) != 0 ||
786: (r = sshpkt_send(ssh)) != 0)
787: fatal("%s: %s", __func__, ssh_err(r));
1.132 markus 788: }
1.133 djm 789:
1.278 markus 790: sshbuf_free(b);
1.132 markus 791: gss_release_buffer(&ms, &mic);
1.133 djm 792: }
1.130 markus 793: }
1.133 djm 794:
1.130 markus 795: return status;
796: }
797:
1.169 djm 798: /* ARGSUSED */
1.220 djm 799: int
1.261 markus 800: input_gssapi_response(int type, u_int32_t plen, struct ssh *ssh)
1.121 markus 801: {
1.260 markus 802: Authctxt *authctxt = ssh->authctxt;
1.121 markus 803: Gssctxt *gssctxt;
1.278 markus 804: size_t oidlen;
805: u_char *oidv = NULL;
806: int r;
1.121 markus 807:
808: if (authctxt == NULL)
809: fatal("input_gssapi_response: no authentication context");
810: gssctxt = authctxt->methoddata;
811:
812: /* Setup our OID */
1.278 markus 813: if ((r = sshpkt_get_string(ssh, &oidv, &oidlen)) != 0)
814: goto done;
1.121 markus 815:
1.129 markus 816: if (oidlen <= 2 ||
817: oidv[0] != SSH_GSS_OIDTYPE ||
818: oidv[1] != oidlen - 2) {
819: debug("Badly encoded mechanism OID received");
820: userauth(authctxt, NULL);
1.278 markus 821: goto ok;
1.121 markus 822: }
1.129 markus 823:
824: if (!ssh_gssapi_check_oid(gssctxt, oidv + 2, oidlen - 2))
825: fatal("Server returned different OID than expected");
1.121 markus 826:
1.278 markus 827: if ((r = sshpkt_get_end(ssh)) != 0)
828: goto done;
1.121 markus 829:
1.262 djm 830: if (GSS_ERROR(process_gssapi_token(ssh, GSS_C_NO_BUFFER))) {
1.121 markus 831: /* Start again with next method on list */
832: debug("Trying to start again");
833: userauth(authctxt, NULL);
1.278 markus 834: goto ok;
1.121 markus 835: }
1.278 markus 836: ok:
837: r = 0;
838: done:
839: free(oidv);
840: return r;
1.121 markus 841: }
842:
1.169 djm 843: /* ARGSUSED */
1.220 djm 844: int
1.261 markus 845: input_gssapi_token(int type, u_int32_t plen, struct ssh *ssh)
1.121 markus 846: {
1.260 markus 847: Authctxt *authctxt = ssh->authctxt;
1.121 markus 848: gss_buffer_desc recv_tok;
1.278 markus 849: u_char *p = NULL;
850: size_t len;
1.130 markus 851: OM_uint32 status;
1.278 markus 852: int r;
1.121 markus 853:
854: if (authctxt == NULL)
855: fatal("input_gssapi_response: no authentication context");
856:
1.278 markus 857: if ((r = sshpkt_get_string(ssh, &p, &len)) != 0 ||
858: (r = sshpkt_get_end(ssh)) != 0)
859: goto out;
1.121 markus 860:
1.278 markus 861: recv_tok.value = p;
862: recv_tok.length = len;
1.262 djm 863: status = process_gssapi_token(ssh, &recv_tok);
1.121 markus 864:
1.278 markus 865: /* Start again with the next method in the list */
1.121 markus 866: if (GSS_ERROR(status)) {
867: userauth(authctxt, NULL);
1.278 markus 868: /* ok */
1.121 markus 869: }
1.278 markus 870: r = 0;
871: out:
872: free(p);
873: return r;
1.121 markus 874: }
875:
1.169 djm 876: /* ARGSUSED */
1.220 djm 877: int
1.261 markus 878: input_gssapi_errtok(int type, u_int32_t plen, struct ssh *ssh)
1.121 markus 879: {
1.260 markus 880: Authctxt *authctxt = ssh->authctxt;
1.121 markus 881: Gssctxt *gssctxt;
882: gss_buffer_desc send_tok = GSS_C_EMPTY_BUFFER;
883: gss_buffer_desc recv_tok;
1.194 djm 884: OM_uint32 ms;
1.278 markus 885: u_char *p = NULL;
886: size_t len;
887: int r;
1.121 markus 888:
889: if (authctxt == NULL)
890: fatal("input_gssapi_response: no authentication context");
891: gssctxt = authctxt->methoddata;
892:
1.278 markus 893: if ((r = sshpkt_get_string(ssh, &p, &len)) != 0 ||
894: (r = sshpkt_get_end(ssh)) != 0) {
895: free(p);
896: return r;
897: }
1.121 markus 898:
899: /* Stick it into GSSAPI and see what it says */
1.278 markus 900: recv_tok.value = p;
901: recv_tok.length = len;
1.194 djm 902: (void)ssh_gssapi_init_ctx(gssctxt, options.gss_deleg_creds,
1.140 djm 903: &recv_tok, &send_tok, NULL);
1.278 markus 904: free(p);
1.121 markus 905: gss_release_buffer(&ms, &send_tok);
906:
907: /* Server will be returning a failed packet after this one */
1.220 djm 908: return 0;
1.121 markus 909: }
910:
1.169 djm 911: /* ARGSUSED */
1.220 djm 912: int
1.261 markus 913: input_gssapi_error(int type, u_int32_t plen, struct ssh *ssh)
1.121 markus 914: {
1.278 markus 915: char *msg = NULL;
916: char *lang = NULL;
917: int r;
1.121 markus 918:
1.278 markus 919: if ((r = sshpkt_get_u32(ssh, NULL)) != 0 || /* maj */
920: (r = sshpkt_get_u32(ssh, NULL)) != 0 || /* min */
921: (r = sshpkt_get_cstring(ssh, &msg, NULL)) != 0 ||
922: (r = sshpkt_get_cstring(ssh, &lang, NULL)) != 0)
923: goto out;
924: r = sshpkt_get_end(ssh);
1.143 stevesk 925: debug("Server GSSAPI Error:\n%s", msg);
1.278 markus 926: out:
1.197 djm 927: free(msg);
928: free(lang);
1.278 markus 929: return r;
1.121 markus 930: }
931: #endif /* GSSAPI */
1.20 markus 932:
1.1 markus 933: int
1.23 markus 934: userauth_none(Authctxt *authctxt)
935: {
1.278 markus 936: struct ssh *ssh = active_state; /* XXX */
937: int r;
938:
1.23 markus 939: /* initial userauth request */
1.278 markus 940: if ((r = sshpkt_start(ssh, SSH2_MSG_USERAUTH_REQUEST)) != 0 ||
941: (r = sshpkt_put_cstring(ssh, authctxt->server_user)) != 0 ||
942: (r = sshpkt_put_cstring(ssh, authctxt->service)) != 0 ||
943: (r = sshpkt_put_cstring(ssh, authctxt->method->name)) != 0 ||
944: (r = sshpkt_send(ssh)) != 0)
945: fatal("%s: %s", __func__, ssh_err(r));
1.23 markus 946: return 1;
947: }
948:
949: int
1.20 markus 950: userauth_passwd(Authctxt *authctxt)
1.1 markus 951: {
1.278 markus 952: struct ssh *ssh = active_state; /* XXX */
1.290 djm 953: char *password, *prompt = NULL;
1.175 dtucker 954: const char *host = options.host_key_alias ? options.host_key_alias :
955: authctxt->host;
1.278 markus 956: int r;
1.6 markus 957:
1.292 ! djm 958: if (authctxt->attempt_passwd++ >= options.number_of_password_prompts)
1.6 markus 959: return 0;
1.13 todd 960:
1.292 ! djm 961: if (authctxt->attempt_passwd != 1)
1.13 todd 962: error("Permission denied, please try again.");
1.1 markus 963:
1.290 djm 964: xasprintf(&prompt, "%s@%s's password: ", authctxt->server_user, host);
1.1 markus 965: password = read_passphrase(prompt, 0);
1.278 markus 966: if ((r = sshpkt_start(ssh, SSH2_MSG_USERAUTH_REQUEST)) != 0 ||
967: (r = sshpkt_put_cstring(ssh, authctxt->server_user)) != 0 ||
968: (r = sshpkt_put_cstring(ssh, authctxt->service)) != 0 ||
969: (r = sshpkt_put_cstring(ssh, authctxt->method->name)) != 0 ||
970: (r = sshpkt_put_u8(ssh, 0)) != 0 ||
971: (r = sshpkt_put_cstring(ssh, password)) != 0 ||
972: (r = sshpkt_add_padding(ssh, 64)) != 0 ||
973: (r = sshpkt_send(ssh)) != 0)
974: fatal("%s: %s", __func__, ssh_err(r));
1.99 markus 975:
1.290 djm 976: free(prompt);
977: if (password != NULL)
1.278 markus 978: freezero(password, strlen(password));
979:
980: ssh_dispatch_set(ssh, SSH2_MSG_USERAUTH_PASSWD_CHANGEREQ,
1.99 markus 981: &input_userauth_passwd_changereq);
982:
1.1 markus 983: return 1;
984: }
1.169 djm 985:
1.99 markus 986: /*
987: * parse PASSWD_CHANGEREQ, prompt user and send SSH2_MSG_USERAUTH_REQUEST
988: */
1.169 djm 989: /* ARGSUSED */
1.218 markus 990: int
1.261 markus 991: input_userauth_passwd_changereq(int type, u_int32_t seqnr, struct ssh *ssh)
1.99 markus 992: {
1.260 markus 993: Authctxt *authctxt = ssh->authctxt;
1.278 markus 994: char *info = NULL, *lang = NULL, *password = NULL, *retype = NULL;
1.266 dtucker 995: char prompt[256];
1.252 djm 996: const char *host;
1.278 markus 997: int r;
1.99 markus 998:
999: debug2("input_userauth_passwd_changereq");
1000:
1001: if (authctxt == NULL)
1002: fatal("input_userauth_passwd_changereq: "
1003: "no authentication context");
1.252 djm 1004: host = options.host_key_alias ? options.host_key_alias : authctxt->host;
1.99 markus 1005:
1.278 markus 1006: if ((r = sshpkt_get_cstring(ssh, &info, NULL)) != 0 ||
1007: (r = sshpkt_get_cstring(ssh, &lang, NULL)) != 0)
1008: goto out;
1.99 markus 1009: if (strlen(info) > 0)
1.116 itojun 1010: logit("%s", info);
1.278 markus 1011: if ((r = sshpkt_start(ssh, SSH2_MSG_USERAUTH_REQUEST)) != 0 ||
1012: (r = sshpkt_put_cstring(ssh, authctxt->server_user)) != 0 ||
1013: (r = sshpkt_put_cstring(ssh, authctxt->service)) != 0 ||
1014: (r = sshpkt_put_cstring(ssh, authctxt->method->name)) != 0 ||
1015: (r = sshpkt_put_u8(ssh, 1)) != 0) /* additional info */
1016: goto out;
1017:
1.104 deraadt 1018: snprintf(prompt, sizeof(prompt),
1.99 markus 1019: "Enter %.30s@%.128s's old password: ",
1.175 dtucker 1020: authctxt->server_user, host);
1.99 markus 1021: password = read_passphrase(prompt, 0);
1.278 markus 1022: if ((r = sshpkt_put_cstring(ssh, password)) != 0)
1023: goto out;
1024:
1025: freezero(password, strlen(password));
1.99 markus 1026: password = NULL;
1027: while (password == NULL) {
1.104 deraadt 1028: snprintf(prompt, sizeof(prompt),
1.99 markus 1029: "Enter %.30s@%.128s's new password: ",
1.175 dtucker 1030: authctxt->server_user, host);
1.99 markus 1031: password = read_passphrase(prompt, RP_ALLOW_EOF);
1032: if (password == NULL) {
1033: /* bail out */
1.278 markus 1034: r = 0;
1035: goto out;
1.99 markus 1036: }
1.104 deraadt 1037: snprintf(prompt, sizeof(prompt),
1.99 markus 1038: "Retype %.30s@%.128s's new password: ",
1.175 dtucker 1039: authctxt->server_user, host);
1.99 markus 1040: retype = read_passphrase(prompt, 0);
1041: if (strcmp(password, retype) != 0) {
1.278 markus 1042: freezero(password, strlen(password));
1.116 itojun 1043: logit("Mismatch; try again, EOF to quit.");
1.99 markus 1044: password = NULL;
1045: }
1.278 markus 1046: freezero(retype, strlen(retype));
1.99 markus 1047: }
1.278 markus 1048: if ((r = sshpkt_put_cstring(ssh, password)) != 0 ||
1049: (r = sshpkt_add_padding(ssh, 64)) != 0 ||
1050: (r = sshpkt_send(ssh)) != 0)
1051: goto out;
1.104 deraadt 1052:
1.278 markus 1053: ssh_dispatch_set(ssh, SSH2_MSG_USERAUTH_PASSWD_CHANGEREQ,
1.99 markus 1054: &input_userauth_passwd_changereq);
1.278 markus 1055: r = 0;
1056: out:
1057: if (password)
1058: freezero(password, strlen(password));
1059: free(info);
1060: free(lang);
1061: return r;
1.117 markus 1062: }
1063:
1.272 djm 1064: /*
1065: * Select an algorithm for publickey signatures.
1066: * Returns algorithm (caller must free) or NULL if no mutual algorithm found.
1067: *
1068: * Call with ssh==NULL to ignore server-sig-algs extension list and
1069: * only attempt with the key's base signature type.
1070: */
1071: static char *
1072: key_sig_algorithm(struct ssh *ssh, const struct sshkey *key)
1.231 markus 1073: {
1.274 djm 1074: char *allowed, *oallowed, *cp, *tmp, *alg = NULL;
1.231 markus 1075:
1.272 djm 1076: /*
1077: * The signature algorithm will only differ from the key algorithm
1078: * for RSA keys/certs and when the server advertises support for
1079: * newer (SHA2) algorithms.
1080: */
1081: if (ssh == NULL || ssh->kex->server_sig_algs == NULL ||
1.288 djm 1082: (key->type != KEY_RSA && key->type != KEY_RSA_CERT) ||
1083: (key->type == KEY_RSA_CERT && (datafellows & SSH_BUG_SIGTYPE))) {
1.272 djm 1084: /* Filter base key signature alg against our configuration */
1.279 markus 1085: return match_list(sshkey_ssh_name(key),
1.272 djm 1086: options.pubkey_key_types, NULL);
1.231 markus 1087: }
1088:
1.272 djm 1089: /*
1090: * For RSA keys/certs, since these might have a different sig type:
1091: * find the first entry in PubkeyAcceptedKeyTypes of the right type
1092: * that also appears in the supported signature algorithms list from
1093: * the server.
1094: */
1095: oallowed = allowed = xstrdup(options.pubkey_key_types);
1096: while ((cp = strsep(&allowed, ",")) != NULL) {
1097: if (sshkey_type_from_name(cp) != key->type)
1098: continue;
1.274 djm 1099: tmp = match_list(sshkey_sigalg_by_name(cp), ssh->kex->server_sig_algs, NULL);
1100: if (tmp != NULL)
1101: alg = xstrdup(cp);
1102: free(tmp);
1.272 djm 1103: if (alg != NULL)
1104: break;
1.269 djm 1105: }
1.272 djm 1106: free(oallowed);
1107: return alg;
1.269 djm 1108: }
1109:
1.117 markus 1110: static int
1.214 djm 1111: identity_sign(struct identity *id, u_char **sigp, size_t *lenp,
1.272 djm 1112: const u_char *data, size_t datalen, u_int compat, const char *alg)
1.117 markus 1113: {
1.259 markus 1114: struct sshkey *prv;
1.269 djm 1115: int r;
1.99 markus 1116:
1.272 djm 1117: /* The agent supports this key. */
1.269 djm 1118: if (id->key != NULL && id->agent_fd != -1) {
1.272 djm 1119: return ssh_agent_sign(id->agent_fd, id->key, sigp, lenp,
1120: data, datalen, alg, compat);
1.269 djm 1121: }
1.214 djm 1122:
1.117 markus 1123: /*
1.272 djm 1124: * We have already loaded the private key or the private key is
1125: * stored in external hardware.
1.117 markus 1126: */
1.255 djm 1127: if (id->key != NULL &&
1.272 djm 1128: (id->isprivate || (id->key->flags & SSHKEY_FLAG_EXT))) {
1129: if ((r = sshkey_sign(id->key, sigp, lenp, data, datalen,
1130: alg, compat)) != 0)
1131: return r;
1132: /*
1133: * PKCS#11 tokens may not support all signature algorithms,
1134: * so check what we get back.
1135: */
1136: if ((r = sshkey_check_sigtype(*sigp, *lenp, alg)) != 0)
1137: return r;
1138: return 0;
1139: }
1.255 djm 1140:
1.272 djm 1141: /* Load the private key from the file. */
1.229 jcs 1142: if ((prv = load_identity_file(id)) == NULL)
1.239 djm 1143: return SSH_ERR_KEY_NOT_FOUND;
1.265 djm 1144: if (id->key != NULL && !sshkey_equal_public(prv, id->key)) {
1145: error("%s: private key %s contents do not match public",
1146: __func__, id->filename);
1147: return SSH_ERR_KEY_NOT_FOUND;
1148: }
1.272 djm 1149: r = sshkey_sign(prv, sigp, lenp, data, datalen, alg, compat);
1.214 djm 1150: sshkey_free(prv);
1.269 djm 1151: return r;
1.51 markus 1152: }
1153:
1.76 itojun 1154: static int
1.255 djm 1155: id_filename_matches(Identity *id, Identity *private_id)
1156: {
1157: const char *suffixes[] = { ".pub", "-cert.pub", NULL };
1158: size_t len = strlen(id->filename), plen = strlen(private_id->filename);
1159: size_t i, slen;
1160:
1161: if (strcmp(id->filename, private_id->filename) == 0)
1162: return 1;
1163: for (i = 0; suffixes[i]; i++) {
1164: slen = strlen(suffixes[i]);
1165: if (len > slen && plen == len - slen &&
1166: strcmp(id->filename + (len - slen), suffixes[i]) == 0 &&
1167: memcmp(id->filename, private_id->filename, plen) == 0)
1168: return 1;
1169: }
1170: return 0;
1171: }
1172:
1173: static int
1.272 djm 1174: sign_and_send_pubkey(struct ssh *ssh, Authctxt *authctxt, Identity *id)
1.1 markus 1175: {
1.272 djm 1176: struct sshbuf *b = NULL;
1177: Identity *private_id, *sign_id = NULL;
1178: u_char *signature = NULL;
1179: size_t slen = 0, skip = 0;
1180: int r, fallback_sigtype, sent = 0;
1181: char *alg = NULL, *fp = NULL;
1182: const char *loc = "";
1.1 markus 1183:
1.222 djm 1184: if ((fp = sshkey_fingerprint(id->key, options.fingerprint_hash,
1185: SSH_FP_DEFAULT)) == NULL)
1186: return 0;
1.51 markus 1187:
1.272 djm 1188: debug3("%s: %s %s", __func__, sshkey_type(id->key), fp);
1.1 markus 1189:
1.227 djm 1190: /*
1191: * If the key is an certificate, try to find a matching private key
1192: * and use it to complete the signature.
1.241 djm 1193: * If no such private key exists, fall back to trying the certificate
1194: * key itself in case it has a private half already loaded.
1.272 djm 1195: * This will try to set sign_id to the private key that will perform
1196: * the signature.
1.227 djm 1197: */
1.272 djm 1198: if (sshkey_is_cert(id->key)) {
1.227 djm 1199: TAILQ_FOREACH(private_id, &authctxt->keys, next) {
1200: if (sshkey_equal_public(id->key, private_id->key) &&
1201: id->key->type != private_id->key->type) {
1.272 djm 1202: sign_id = private_id;
1.227 djm 1203: break;
1204: }
1205: }
1.255 djm 1206: /*
1207: * Exact key matches are preferred, but also allow
1208: * filename matches for non-PKCS#11/agent keys that
1209: * didn't load public keys. This supports the case
1210: * of keeping just a private key file and public
1211: * certificate on disk.
1212: */
1.272 djm 1213: if (sign_id == NULL &&
1214: !id->isprivate && id->agent_fd == -1 &&
1.255 djm 1215: (id->key->flags & SSHKEY_FLAG_EXT) == 0) {
1216: TAILQ_FOREACH(private_id, &authctxt->keys, next) {
1217: if (private_id->key == NULL &&
1218: id_filename_matches(id, private_id)) {
1.272 djm 1219: sign_id = private_id;
1.255 djm 1220: break;
1221: }
1222: }
1223: }
1.272 djm 1224: if (sign_id != NULL) {
1.227 djm 1225: debug2("%s: using private key \"%s\"%s for "
1226: "certificate", __func__, id->filename,
1227: id->agent_fd != -1 ? " from agent" : "");
1228: } else {
1.240 djm 1229: debug("%s: no separate private key for certificate "
1.227 djm 1230: "\"%s\"", __func__, id->filename);
1231: }
1232: }
1233:
1.272 djm 1234: /*
1235: * If the above didn't select another identity to do the signing
1236: * then default to the one we started with.
1237: */
1238: if (sign_id == NULL)
1239: sign_id = id;
1240:
1241: /* assemble and sign data */
1242: for (fallback_sigtype = 0; fallback_sigtype <= 1; fallback_sigtype++) {
1243: free(alg);
1244: slen = 0;
1245: signature = NULL;
1246: if ((alg = key_sig_algorithm(fallback_sigtype ? NULL : ssh,
1247: id->key)) == NULL) {
1248: error("%s: no mutual signature supported", __func__);
1249: goto out;
1250: }
1251: debug3("%s: signing using %s", __func__, alg);
1252:
1253: sshbuf_free(b);
1254: if ((b = sshbuf_new()) == NULL)
1255: fatal("%s: sshbuf_new failed", __func__);
1256: if (datafellows & SSH_OLD_SESSIONID) {
1257: if ((r = sshbuf_put(b, session_id2,
1258: session_id2_len)) != 0) {
1259: fatal("%s: sshbuf_put: %s",
1260: __func__, ssh_err(r));
1261: }
1262: } else {
1263: if ((r = sshbuf_put_string(b, session_id2,
1264: session_id2_len)) != 0) {
1265: fatal("%s: sshbuf_put_string: %s",
1266: __func__, ssh_err(r));
1267: }
1268: }
1.278 markus 1269: skip = sshbuf_len(b);
1.272 djm 1270: if ((r = sshbuf_put_u8(b, SSH2_MSG_USERAUTH_REQUEST)) != 0 ||
1271: (r = sshbuf_put_cstring(b, authctxt->server_user)) != 0 ||
1272: (r = sshbuf_put_cstring(b, authctxt->service)) != 0 ||
1273: (r = sshbuf_put_cstring(b, authctxt->method->name)) != 0 ||
1274: (r = sshbuf_put_u8(b, 1)) != 0 ||
1275: (r = sshbuf_put_cstring(b, alg)) != 0 ||
1276: (r = sshkey_puts(id->key, b)) != 0) {
1277: fatal("%s: assemble signed data: %s",
1278: __func__, ssh_err(r));
1279: }
1280:
1281: /* generate signature */
1282: r = identity_sign(sign_id, &signature, &slen,
1283: sshbuf_ptr(b), sshbuf_len(b), datafellows, alg);
1284: if (r == 0)
1285: break;
1286: else if (r == SSH_ERR_KEY_NOT_FOUND)
1287: goto out; /* soft failure */
1288: else if (r == SSH_ERR_SIGN_ALG_UNSUPPORTED &&
1289: !fallback_sigtype) {
1290: if (sign_id->agent_fd != -1)
1291: loc = "agent ";
1292: else if ((sign_id->key->flags & SSHKEY_FLAG_EXT) != 0)
1293: loc = "token ";
1294: logit("%skey %s %s returned incorrect signature type",
1295: loc, sshkey_type(id->key), fp);
1296: continue;
1297: }
1298: error("%s: signing failed: %s", __func__, ssh_err(r));
1299: goto out;
1.17 markus 1300: }
1.272 djm 1301: if (slen == 0 || signature == NULL) /* shouldn't happen */
1302: fatal("%s: no signature", __func__);
1.51 markus 1303:
1.1 markus 1304: /* append signature */
1.272 djm 1305: if ((r = sshbuf_put_string(b, signature, slen)) != 0)
1306: fatal("%s: append signature: %s", __func__, ssh_err(r));
1.1 markus 1307:
1.272 djm 1308: #ifdef DEBUG_PK
1309: sshbuf_dump(b, stderr);
1310: #endif
1.1 markus 1311: /* skip session id and packet type */
1.272 djm 1312: if ((r = sshbuf_consume(b, skip + 1)) != 0)
1313: fatal("%s: consume: %s", __func__, ssh_err(r));
1.1 markus 1314:
1315: /* put remaining data from buffer into packet */
1.272 djm 1316: if ((r = sshpkt_start(ssh, SSH2_MSG_USERAUTH_REQUEST)) != 0 ||
1317: (r = sshpkt_putb(ssh, b)) != 0 ||
1318: (r = sshpkt_send(ssh)) != 0)
1319: fatal("%s: enqueue request: %s", __func__, ssh_err(r));
1320:
1321: /* success */
1322: sent = 1;
1.17 markus 1323:
1.272 djm 1324: out:
1325: free(fp);
1326: free(alg);
1327: sshbuf_free(b);
1328: freezero(signature, slen);
1329: return sent;
1.16 markus 1330: }
1331:
1.76 itojun 1332: static int
1.272 djm 1333: send_pubkey_test(struct ssh *ssh, Authctxt *authctxt, Identity *id)
1.20 markus 1334: {
1.272 djm 1335: u_char *blob = NULL;
1336: char *alg = NULL;
1.278 markus 1337: size_t bloblen;
1338: u_int have_sig = 0;
1339: int sent = 0, r;
1.20 markus 1340:
1.272 djm 1341: if ((alg = key_sig_algorithm(ssh, id->key)) == NULL) {
1342: debug("%s: no mutual signature algorithm", __func__);
1343: goto out;
1344: }
1.16 markus 1345:
1.278 markus 1346: if ((r = sshkey_to_blob(id->key, &blob, &bloblen)) != 0) {
1.51 markus 1347: /* we cannot handle this key */
1.272 djm 1348: debug3("%s: cannot handle key", __func__);
1349: goto out;
1.16 markus 1350: }
1.51 markus 1351: /* register callback for USERAUTH_PK_OK message */
1.278 markus 1352: ssh_dispatch_set(ssh, SSH2_MSG_USERAUTH_PK_OK, &input_userauth_pk_ok);
1.51 markus 1353:
1.278 markus 1354: if ((r = sshpkt_start(ssh, SSH2_MSG_USERAUTH_REQUEST)) != 0 ||
1355: (r = sshpkt_put_cstring(ssh, authctxt->server_user)) != 0 ||
1356: (r = sshpkt_put_cstring(ssh, authctxt->service)) != 0 ||
1357: (r = sshpkt_put_cstring(ssh, authctxt->method->name)) != 0 ||
1358: (r = sshpkt_put_u8(ssh, have_sig)) != 0 ||
1359: (r = sshpkt_put_cstring(ssh, alg)) != 0 ||
1360: (r = sshpkt_put_string(ssh, blob, bloblen)) != 0 ||
1361: (r = sshpkt_send(ssh)) != 0)
1362: fatal("%s: %s", __func__, ssh_err(r));
1.272 djm 1363: sent = 1;
1.278 markus 1364:
1365: out:
1.272 djm 1366: free(alg);
1.197 djm 1367: free(blob);
1.272 djm 1368: return sent;
1.51 markus 1369: }
1370:
1.259 markus 1371: static struct sshkey *
1.229 jcs 1372: load_identity_file(Identity *id)
1.51 markus 1373: {
1.259 markus 1374: struct sshkey *private = NULL;
1.229 jcs 1375: char prompt[300], *passphrase, *comment;
1.215 djm 1376: int r, perm_ok = 0, quit = 0, i;
1.52 markus 1377: struct stat st;
1.16 markus 1378:
1.229 jcs 1379: if (stat(id->filename, &st) < 0) {
1380: (id->userprovided ? logit : debug3)("no such identity: %s: %s",
1381: id->filename, strerror(errno));
1.52 markus 1382: return NULL;
1383: }
1.214 djm 1384: snprintf(prompt, sizeof prompt,
1.229 jcs 1385: "Enter passphrase for key '%.100s': ", id->filename);
1.214 djm 1386: for (i = 0; i <= options.number_of_password_prompts; i++) {
1387: if (i == 0)
1388: passphrase = "";
1389: else {
1.20 markus 1390: passphrase = read_passphrase(prompt, 0);
1.214 djm 1391: if (*passphrase == '\0') {
1.20 markus 1392: debug2("no passphrase given, try next key");
1.214 djm 1393: free(passphrase);
1394: break;
1395: }
1396: }
1.229 jcs 1397: switch ((r = sshkey_load_private_type(KEY_UNSPEC, id->filename,
1398: passphrase, &private, &comment, &perm_ok))) {
1.214 djm 1399: case 0:
1400: break;
1401: case SSH_ERR_KEY_WRONG_PASSPHRASE:
1402: if (options.batch_mode) {
1403: quit = 1;
1404: break;
1405: }
1.215 djm 1406: if (i != 0)
1407: debug2("bad passphrase given, try again...");
1.214 djm 1408: break;
1409: case SSH_ERR_SYSTEM_ERROR:
1410: if (errno == ENOENT) {
1411: debug2("Load key \"%s\": %s",
1.229 jcs 1412: id->filename, ssh_err(r));
1.51 markus 1413: quit = 1;
1.214 djm 1414: break;
1.20 markus 1415: }
1.214 djm 1416: /* FALLTHROUGH */
1417: default:
1.229 jcs 1418: error("Load key \"%s\": %s", id->filename, ssh_err(r));
1.214 djm 1419: quit = 1;
1420: break;
1421: }
1.230 djm 1422: if (!quit && private != NULL && id->agent_fd == -1 &&
1.229 jcs 1423: !(id->key && id->isprivate))
1424: maybe_add_key_to_agent(id->filename, private, comment,
1425: passphrase);
1.278 markus 1426: if (i > 0)
1427: freezero(passphrase, strlen(passphrase));
1.232 mmcc 1428: free(comment);
1.214 djm 1429: if (private != NULL || quit)
1430: break;
1.16 markus 1431: }
1.51 markus 1432: return private;
1433: }
1434:
1.272 djm 1435: static int
1436: key_type_allowed_by_config(struct sshkey *key)
1437: {
1438: if (match_pattern_list(sshkey_ssh_name(key),
1439: options.pubkey_key_types, 0) == 1)
1440: return 1;
1441:
1442: /* RSA keys/certs might be allowed by alternate signature types */
1443: switch (key->type) {
1444: case KEY_RSA:
1445: if (match_pattern_list("rsa-sha2-512",
1446: options.pubkey_key_types, 0) == 1)
1447: return 1;
1448: if (match_pattern_list("rsa-sha2-256",
1449: options.pubkey_key_types, 0) == 1)
1450: return 1;
1451: break;
1452: case KEY_RSA_CERT:
1453: if (match_pattern_list("rsa-sha2-512-cert-v01@openssh.com",
1454: options.pubkey_key_types, 0) == 1)
1455: return 1;
1456: if (match_pattern_list("rsa-sha2-256-cert-v01@openssh.com",
1457: options.pubkey_key_types, 0) == 1)
1458: return 1;
1459: break;
1460: }
1461: return 0;
1462: }
1463:
1464:
1.117 markus 1465: /*
1466: * try keys in the following order:
1.227 djm 1467: * 1. certificates listed in the config file
1468: * 2. other input certificates
1469: * 3. agent keys that are found in the config file
1470: * 4. other agent keys
1471: * 5. keys that are only listed in the config file
1.117 markus 1472: */
1473: static void
1474: pubkey_prepare(Authctxt *authctxt)
1.51 markus 1475: {
1.214 djm 1476: struct identity *id, *id2, *tmp;
1477: struct idlist agent, files, *preferred;
1478: struct sshkey *key;
1.230 djm 1479: int agent_fd = -1, i, r, found;
1.214 djm 1480: size_t j;
1481: struct ssh_identitylist *idlist;
1.287 djm 1482: char *ident;
1.51 markus 1483:
1.117 markus 1484: TAILQ_INIT(&agent); /* keys from the agent */
1485: TAILQ_INIT(&files); /* keys from the config file */
1486: preferred = &authctxt->keys;
1487: TAILQ_INIT(preferred); /* preferred order of keys */
1488:
1.190 djm 1489: /* list of keys stored in the filesystem and PKCS#11 */
1.117 markus 1490: for (i = 0; i < options.num_identity_files; i++) {
1491: key = options.identity_keys[i];
1.180 djm 1492: if (key && key->cert && key->cert->type != SSH2_CERT_TYPE_USER)
1.117 markus 1493: continue;
1494: options.identity_keys[i] = NULL;
1.150 djm 1495: id = xcalloc(1, sizeof(*id));
1.230 djm 1496: id->agent_fd = -1;
1.117 markus 1497: id->key = key;
1498: id->filename = xstrdup(options.identity_files[i]);
1.192 dtucker 1499: id->userprovided = options.identity_file_userprovided[i];
1.117 markus 1500: TAILQ_INSERT_TAIL(&files, id, next);
1.190 djm 1501: }
1.227 djm 1502: /* list of certificates specified by user */
1503: for (i = 0; i < options.num_certificate_files; i++) {
1504: key = options.certificates[i];
1.278 markus 1505: if (!sshkey_is_cert(key) || key->cert == NULL ||
1.227 djm 1506: key->cert->type != SSH2_CERT_TYPE_USER)
1507: continue;
1508: id = xcalloc(1, sizeof(*id));
1.230 djm 1509: id->agent_fd = -1;
1.227 djm 1510: id->key = key;
1511: id->filename = xstrdup(options.certificate_files[i]);
1512: id->userprovided = options.certificate_file_userprovided[i];
1513: TAILQ_INSERT_TAIL(preferred, id, next);
1.117 markus 1514: }
1515: /* list of keys supported by the agent */
1.214 djm 1516: if ((r = ssh_get_authentication_socket(&agent_fd)) != 0) {
1517: if (r != SSH_ERR_AGENT_NOT_PRESENT)
1518: debug("%s: ssh_get_authentication_socket: %s",
1519: __func__, ssh_err(r));
1.258 naddy 1520: } else if ((r = ssh_fetch_identitylist(agent_fd, &idlist)) != 0) {
1.214 djm 1521: if (r != SSH_ERR_AGENT_NO_IDENTITIES)
1522: debug("%s: ssh_fetch_identitylist: %s",
1523: __func__, ssh_err(r));
1.237 markus 1524: close(agent_fd);
1.214 djm 1525: } else {
1526: for (j = 0; j < idlist->nkeys; j++) {
1.117 markus 1527: found = 0;
1528: TAILQ_FOREACH(id, &files, next) {
1.214 djm 1529: /*
1530: * agent keys from the config file are
1531: * preferred
1532: */
1533: if (sshkey_equal(idlist->keys[j], id->key)) {
1.117 markus 1534: TAILQ_REMOVE(&files, id, next);
1535: TAILQ_INSERT_TAIL(preferred, id, next);
1.214 djm 1536: id->agent_fd = agent_fd;
1.117 markus 1537: found = 1;
1538: break;
1539: }
1540: }
1.135 markus 1541: if (!found && !options.identities_only) {
1.150 djm 1542: id = xcalloc(1, sizeof(*id));
1.214 djm 1543: /* XXX "steals" key/comment from idlist */
1544: id->key = idlist->keys[j];
1545: id->filename = idlist->comments[j];
1546: idlist->keys[j] = NULL;
1547: idlist->comments[j] = NULL;
1548: id->agent_fd = agent_fd;
1.117 markus 1549: TAILQ_INSERT_TAIL(&agent, id, next);
1550: }
1551: }
1.214 djm 1552: ssh_free_identitylist(idlist);
1.117 markus 1553: /* append remaining agent keys */
1554: for (id = TAILQ_FIRST(&agent); id; id = TAILQ_FIRST(&agent)) {
1555: TAILQ_REMOVE(&agent, id, next);
1556: TAILQ_INSERT_TAIL(preferred, id, next);
1557: }
1.214 djm 1558: authctxt->agent_fd = agent_fd;
1.244 djm 1559: }
1560: /* Prefer PKCS11 keys that are explicitly listed */
1561: TAILQ_FOREACH_SAFE(id, &files, next, tmp) {
1562: if (id->key == NULL || (id->key->flags & SSHKEY_FLAG_EXT) == 0)
1563: continue;
1564: found = 0;
1565: TAILQ_FOREACH(id2, &files, next) {
1566: if (id2->key == NULL ||
1567: (id2->key->flags & SSHKEY_FLAG_EXT) == 0)
1568: continue;
1569: if (sshkey_equal(id->key, id2->key)) {
1570: TAILQ_REMOVE(&files, id, next);
1571: TAILQ_INSERT_TAIL(preferred, id, next);
1572: found = 1;
1573: break;
1574: }
1575: }
1576: /* If IdentitiesOnly set and key not found then don't use it */
1577: if (!found && options.identities_only) {
1578: TAILQ_REMOVE(&files, id, next);
1.278 markus 1579: freezero(id, sizeof(*id));
1.244 djm 1580: }
1.117 markus 1581: }
1582: /* append remaining keys from the config file */
1583: for (id = TAILQ_FIRST(&files); id; id = TAILQ_FIRST(&files)) {
1584: TAILQ_REMOVE(&files, id, next);
1585: TAILQ_INSERT_TAIL(preferred, id, next);
1586: }
1.228 djm 1587: /* finally, filter by PubkeyAcceptedKeyTypes */
1588: TAILQ_FOREACH_SAFE(id, preferred, next, id2) {
1.273 djm 1589: if (id->key != NULL && !key_type_allowed_by_config(id->key)) {
1.228 djm 1590: debug("Skipping %s key %s - "
1591: "not in PubkeyAcceptedKeyTypes",
1592: sshkey_ssh_name(id->key), id->filename);
1593: TAILQ_REMOVE(preferred, id, next);
1594: sshkey_free(id->key);
1595: free(id->filename);
1596: memset(id, 0, sizeof(*id));
1597: continue;
1598: }
1.117 markus 1599: }
1.287 djm 1600: /* List the keys we plan on using */
1601: TAILQ_FOREACH_SAFE(id, preferred, next, id2) {
1602: ident = format_identity(id);
1603: debug("Will attempt key: %s", ident);
1604: free(ident);
1605: }
1606: debug2("%s: done", __func__);
1.17 markus 1607: }
1608:
1.117 markus 1609: static void
1610: pubkey_cleanup(Authctxt *authctxt)
1.51 markus 1611: {
1.117 markus 1612: Identity *id;
1.51 markus 1613:
1.289 djm 1614: if (authctxt->agent_fd != -1) {
1.214 djm 1615: ssh_close_authentication_socket(authctxt->agent_fd);
1.289 djm 1616: authctxt->agent_fd = -1;
1617: }
1.117 markus 1618: for (id = TAILQ_FIRST(&authctxt->keys); id;
1619: id = TAILQ_FIRST(&authctxt->keys)) {
1620: TAILQ_REMOVE(&authctxt->keys, id, next);
1.235 mmcc 1621: sshkey_free(id->key);
1.197 djm 1622: free(id->filename);
1623: free(id);
1.117 markus 1624: }
1.1 markus 1625: }
1626:
1.251 djm 1627: static void
1628: pubkey_reset(Authctxt *authctxt)
1629: {
1630: Identity *id;
1631:
1632: TAILQ_FOREACH(id, &authctxt->keys, next)
1633: id->tried = 0;
1634: }
1635:
1.225 markus 1636: static int
1637: try_identity(Identity *id)
1638: {
1639: if (!id->key)
1640: return (0);
1.279 markus 1641: if (sshkey_type_plain(id->key->type) == KEY_RSA &&
1.225 markus 1642: (datafellows & SSH_BUG_RSASIGMD5) != 0) {
1643: debug("Skipped %s key %s for RSA/MD5 server",
1.279 markus 1644: sshkey_type(id->key), id->filename);
1.225 markus 1645: return (0);
1646: }
1.257 djm 1647: return 1;
1.225 markus 1648: }
1649:
1.20 markus 1650: int
1651: userauth_pubkey(Authctxt *authctxt)
1652: {
1.272 djm 1653: struct ssh *ssh = active_state; /* XXX */
1.117 markus 1654: Identity *id;
1.20 markus 1655: int sent = 0;
1.287 djm 1656: char *ident;
1.20 markus 1657:
1.117 markus 1658: while ((id = TAILQ_FIRST(&authctxt->keys))) {
1659: if (id->tried++)
1660: return (0);
1.127 markus 1661: /* move key to the end of the queue */
1.117 markus 1662: TAILQ_REMOVE(&authctxt->keys, id, next);
1663: TAILQ_INSERT_TAIL(&authctxt->keys, id, next);
1664: /*
1665: * send a test message if we have the public key. for
1666: * encrypted keys we cannot do this and have to load the
1667: * private key instead
1668: */
1.200 djm 1669: if (id->key != NULL) {
1.225 markus 1670: if (try_identity(id)) {
1.287 djm 1671: ident = format_identity(id);
1672: debug("Offering public key: %s", ident);
1673: free(ident);
1.272 djm 1674: sent = send_pubkey_test(ssh, authctxt, id);
1.200 djm 1675: }
1676: } else {
1.117 markus 1677: debug("Trying private key: %s", id->filename);
1.229 jcs 1678: id->key = load_identity_file(id);
1.117 markus 1679: if (id->key != NULL) {
1.225 markus 1680: if (try_identity(id)) {
1681: id->isprivate = 1;
1.272 djm 1682: sent = sign_and_send_pubkey(ssh,
1.200 djm 1683: authctxt, id);
1684: }
1.278 markus 1685: sshkey_free(id->key);
1.117 markus 1686: id->key = NULL;
1.251 djm 1687: id->isprivate = 0;
1.51 markus 1688: }
1689: }
1.117 markus 1690: if (sent)
1691: return (sent);
1.28 markus 1692: }
1.117 markus 1693: return (0);
1.20 markus 1694: }
1695:
1.23 markus 1696: /*
1697: * Send userauth request message specifying keyboard-interactive method.
1698: */
1699: int
1700: userauth_kbdint(Authctxt *authctxt)
1701: {
1.278 markus 1702: struct ssh *ssh = active_state; /* XXX */
1703: int r;
1.23 markus 1704:
1.292 ! djm 1705: if (authctxt->attempt_kbdint++ >= options.number_of_password_prompts)
1.23 markus 1706: return 0;
1.82 markus 1707: /* disable if no SSH2_MSG_USERAUTH_INFO_REQUEST has been seen */
1.292 ! djm 1708: if (authctxt->attempt_kbdint > 1 && !authctxt->info_req_seen) {
1.82 markus 1709: debug3("userauth_kbdint: disable: no info_req_seen");
1.278 markus 1710: ssh_dispatch_set(ssh, SSH2_MSG_USERAUTH_INFO_REQUEST, NULL);
1.82 markus 1711: return 0;
1712: }
1.23 markus 1713:
1714: debug2("userauth_kbdint");
1.278 markus 1715: if ((r = sshpkt_start(ssh, SSH2_MSG_USERAUTH_REQUEST)) != 0 ||
1716: (r = sshpkt_put_cstring(ssh, authctxt->server_user)) != 0 ||
1717: (r = sshpkt_put_cstring(ssh, authctxt->service)) != 0 ||
1718: (r = sshpkt_put_cstring(ssh, authctxt->method->name)) != 0 ||
1719: (r = sshpkt_put_cstring(ssh, "")) != 0 || /* lang */
1720: (r = sshpkt_put_cstring(ssh, options.kbd_interactive_devices ?
1721: options.kbd_interactive_devices : "")) != 0 ||
1722: (r = sshpkt_send(ssh)) != 0)
1723: fatal("%s: %s", __func__, ssh_err(r));
1.23 markus 1724:
1.278 markus 1725: ssh_dispatch_set(ssh, SSH2_MSG_USERAUTH_INFO_REQUEST, &input_userauth_info_req);
1.23 markus 1726: return 1;
1727: }
1728:
1729: /*
1.46 markus 1730: * parse INFO_REQUEST, prompt user and send INFO_RESPONSE
1.23 markus 1731: */
1.218 markus 1732: int
1.261 markus 1733: input_userauth_info_req(int type, u_int32_t seq, struct ssh *ssh)
1.23 markus 1734: {
1.260 markus 1735: Authctxt *authctxt = ssh->authctxt;
1.278 markus 1736: char *name = NULL, *inst = NULL, *lang = NULL, *prompt = NULL;
1737: char *response = NULL;
1738: u_char echo = 0;
1.32 markus 1739: u_int num_prompts, i;
1.278 markus 1740: int r;
1.23 markus 1741:
1742: debug2("input_userauth_info_req");
1743:
1744: if (authctxt == NULL)
1745: fatal("input_userauth_info_req: no authentication context");
1.82 markus 1746:
1747: authctxt->info_req_seen = 1;
1.23 markus 1748:
1.278 markus 1749: if ((r = sshpkt_get_cstring(ssh, &name, NULL)) != 0 ||
1750: (r = sshpkt_get_cstring(ssh, &inst, NULL)) != 0 ||
1751: (r = sshpkt_get_cstring(ssh, &lang, NULL)) != 0)
1752: goto out;
1.23 markus 1753: if (strlen(name) > 0)
1.116 itojun 1754: logit("%s", name);
1.23 markus 1755: if (strlen(inst) > 0)
1.116 itojun 1756: logit("%s", inst);
1.23 markus 1757:
1.278 markus 1758: if ((r = sshpkt_get_u32(ssh, &num_prompts)) != 0)
1759: goto out;
1.23 markus 1760: /*
1761: * Begin to build info response packet based on prompts requested.
1762: * We commit to providing the correct number of responses, so if
1763: * further on we run into a problem that prevents this, we have to
1764: * be sure and clean this up and send a correct error response.
1765: */
1.278 markus 1766: if ((r = sshpkt_start(ssh, SSH2_MSG_USERAUTH_INFO_RESPONSE)) != 0 ||
1767: (r = sshpkt_put_u32(ssh, num_prompts)) != 0)
1768: goto out;
1.23 markus 1769:
1.73 markus 1770: debug2("input_userauth_info_req: num_prompts %d", num_prompts);
1.23 markus 1771: for (i = 0; i < num_prompts; i++) {
1.278 markus 1772: if ((r = sshpkt_get_cstring(ssh, &prompt, NULL)) != 0 ||
1773: (r = sshpkt_get_u8(ssh, &echo)) != 0)
1774: goto out;
1.77 markus 1775: response = read_passphrase(prompt, echo ? RP_ECHO : 0);
1.278 markus 1776: if ((r = sshpkt_put_cstring(ssh, response)) != 0)
1777: goto out;
1778: freezero(response, strlen(response));
1.197 djm 1779: free(prompt);
1.278 markus 1780: response = prompt = NULL;
1.23 markus 1781: }
1.278 markus 1782: /* done with parsing incoming message. */
1783: if ((r = sshpkt_get_end(ssh)) != 0 ||
1784: (r = sshpkt_add_padding(ssh, 64)) != 0)
1785: goto out;
1786: r = sshpkt_send(ssh);
1787: out:
1788: if (response)
1789: freezero(response, strlen(response));
1790: free(prompt);
1791: free(name);
1792: free(inst);
1793: free(lang);
1794: return r;
1.68 markus 1795: }
1796:
1.100 markus 1797: static int
1.223 djm 1798: ssh_keysign(struct sshkey *key, u_char **sigp, size_t *lenp,
1799: const u_char *data, size_t datalen)
1.100 markus 1800: {
1.223 djm 1801: struct sshbuf *b;
1.101 markus 1802: struct stat st;
1.100 markus 1803: pid_t pid;
1.223 djm 1804: int i, r, to[2], from[2], status, sock = packet_get_connection_in();
1805: u_char rversion = 0, version = 2;
1806: void (*osigchld)(int);
1.100 markus 1807:
1.223 djm 1808: *sigp = NULL;
1809: *lenp = 0;
1.100 markus 1810:
1.101 markus 1811: if (stat(_PATH_SSH_KEY_SIGN, &st) < 0) {
1.223 djm 1812: error("%s: not installed: %s", __func__, strerror(errno));
1813: return -1;
1814: }
1815: if (fflush(stdout) != 0) {
1816: error("%s: fflush: %s", __func__, strerror(errno));
1.101 markus 1817: return -1;
1818: }
1.100 markus 1819: if (pipe(to) < 0) {
1.223 djm 1820: error("%s: pipe: %s", __func__, strerror(errno));
1.100 markus 1821: return -1;
1822: }
1823: if (pipe(from) < 0) {
1.223 djm 1824: error("%s: pipe: %s", __func__, strerror(errno));
1.100 markus 1825: return -1;
1826: }
1827: if ((pid = fork()) < 0) {
1.223 djm 1828: error("%s: fork: %s", __func__, strerror(errno));
1.100 markus 1829: return -1;
1830: }
1.223 djm 1831: osigchld = signal(SIGCHLD, SIG_DFL);
1.100 markus 1832: if (pid == 0) {
1.174 dtucker 1833: /* keep the socket on exec */
1.223 djm 1834: fcntl(sock, F_SETFD, 0);
1.100 markus 1835: close(from[0]);
1836: if (dup2(from[1], STDOUT_FILENO) < 0)
1.223 djm 1837: fatal("%s: dup2: %s", __func__, strerror(errno));
1.100 markus 1838: close(to[1]);
1839: if (dup2(to[0], STDIN_FILENO) < 0)
1.223 djm 1840: fatal("%s: dup2: %s", __func__, strerror(errno));
1.103 markus 1841: close(from[1]);
1842: close(to[0]);
1.223 djm 1843: /* Close everything but stdio and the socket */
1844: for (i = STDERR_FILENO + 1; i < sock; i++)
1845: close(i);
1846: closefrom(sock + 1);
1847: debug3("%s: [child] pid=%ld, exec %s",
1848: __func__, (long)getpid(), _PATH_SSH_KEY_SIGN);
1.233 mmcc 1849: execl(_PATH_SSH_KEY_SIGN, _PATH_SSH_KEY_SIGN, (char *)NULL);
1.223 djm 1850: fatal("%s: exec(%s): %s", __func__, _PATH_SSH_KEY_SIGN,
1.100 markus 1851: strerror(errno));
1852: }
1853: close(from[1]);
1854: close(to[0]);
1855:
1.223 djm 1856: if ((b = sshbuf_new()) == NULL)
1857: fatal("%s: sshbuf_new failed", __func__);
1858: /* send # of sock, data to be signed */
1.253 djm 1859: if ((r = sshbuf_put_u32(b, sock)) != 0 ||
1.223 djm 1860: (r = sshbuf_put_string(b, data, datalen)) != 0)
1861: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1862: if (ssh_msg_send(to[1], version, b) == -1)
1863: fatal("%s: couldn't send request", __func__);
1864: sshbuf_reset(b);
1865: r = ssh_msg_recv(from[0], b);
1.101 markus 1866: close(from[0]);
1867: close(to[1]);
1.223 djm 1868: if (r < 0) {
1869: error("%s: no reply", __func__);
1870: goto fail;
1871: }
1.101 markus 1872:
1.223 djm 1873: errno = 0;
1874: while (waitpid(pid, &status, 0) < 0) {
1875: if (errno != EINTR) {
1876: error("%s: waitpid %ld: %s",
1877: __func__, (long)pid, strerror(errno));
1878: goto fail;
1879: }
1880: }
1881: if (!WIFEXITED(status)) {
1882: error("%s: exited abnormally", __func__);
1883: goto fail;
1884: }
1885: if (WEXITSTATUS(status) != 0) {
1886: error("%s: exited with status %d",
1887: __func__, WEXITSTATUS(status));
1888: goto fail;
1889: }
1890: if ((r = sshbuf_get_u8(b, &rversion)) != 0) {
1891: error("%s: buffer error: %s", __func__, ssh_err(r));
1892: goto fail;
1893: }
1894: if (rversion != version) {
1895: error("%s: bad version", __func__);
1896: goto fail;
1897: }
1898: if ((r = sshbuf_get_string(b, sigp, lenp)) != 0) {
1899: error("%s: buffer error: %s", __func__, ssh_err(r));
1900: fail:
1901: signal(SIGCHLD, osigchld);
1902: sshbuf_free(b);
1.100 markus 1903: return -1;
1904: }
1.223 djm 1905: signal(SIGCHLD, osigchld);
1906: sshbuf_free(b);
1.100 markus 1907:
1908: return 0;
1909: }
1910:
1.68 markus 1911: int
1912: userauth_hostbased(Authctxt *authctxt)
1913: {
1.272 djm 1914: struct ssh *ssh = active_state; /* XXX */
1.223 djm 1915: struct sshkey *private = NULL;
1916: struct sshbuf *b = NULL;
1917: u_char *sig = NULL, *keyblob = NULL;
1918: char *fp = NULL, *chost = NULL, *lname = NULL;
1919: size_t siglen = 0, keylen = 0;
1920: int i, r, success = 0;
1921:
1922: if (authctxt->ktypes == NULL) {
1923: authctxt->oktypes = xstrdup(options.hostbased_key_types);
1924: authctxt->ktypes = authctxt->oktypes;
1925: }
1.213 djm 1926:
1.223 djm 1927: /*
1928: * Work through each listed type pattern in HostbasedKeyTypes,
1929: * trying each hostkey that matches the type in turn.
1930: */
1931: for (;;) {
1932: if (authctxt->active_ktype == NULL)
1933: authctxt->active_ktype = strsep(&authctxt->ktypes, ",");
1934: if (authctxt->active_ktype == NULL ||
1935: *authctxt->active_ktype == '\0')
1936: break;
1937: debug3("%s: trying key type %s", __func__,
1938: authctxt->active_ktype);
1.68 markus 1939:
1.223 djm 1940: /* check for a useful key */
1941: private = NULL;
1942: for (i = 0; i < authctxt->sensitive->nkeys; i++) {
1943: if (authctxt->sensitive->keys[i] == NULL ||
1944: authctxt->sensitive->keys[i]->type == KEY_UNSPEC)
1945: continue;
1946: if (match_pattern_list(
1947: sshkey_ssh_name(authctxt->sensitive->keys[i]),
1.224 djm 1948: authctxt->active_ktype, 0) != 1)
1.223 djm 1949: continue;
1.68 markus 1950: /* we take and free the key */
1.223 djm 1951: private = authctxt->sensitive->keys[i];
1952: authctxt->sensitive->keys[i] = NULL;
1.68 markus 1953: break;
1954: }
1.223 djm 1955: /* Found one */
1956: if (private != NULL)
1957: break;
1958: /* No more keys of this type; advance */
1959: authctxt->active_ktype = NULL;
1.68 markus 1960: }
1.223 djm 1961: if (private == NULL) {
1962: free(authctxt->oktypes);
1963: authctxt->oktypes = authctxt->ktypes = NULL;
1964: authctxt->active_ktype = NULL;
1.109 markus 1965: debug("No more client hostkeys for hostbased authentication.");
1.223 djm 1966: goto out;
1.68 markus 1967: }
1.211 djm 1968:
1.223 djm 1969: if ((fp = sshkey_fingerprint(private, options.fingerprint_hash,
1970: SSH_FP_DEFAULT)) == NULL) {
1971: error("%s: sshkey_fingerprint failed", __func__);
1972: goto out;
1.68 markus 1973: }
1.223 djm 1974: debug("%s: trying hostkey %s %s",
1975: __func__, sshkey_ssh_name(private), fp);
1.211 djm 1976:
1.84 markus 1977: /* figure out a name for the client host */
1.223 djm 1978: if ((lname = get_local_name(packet_get_connection_in())) == NULL) {
1979: error("%s: cannot get local ipaddr/name", __func__);
1980: goto out;
1.84 markus 1981: }
1.223 djm 1982:
1983: /* XXX sshbuf_put_stringf? */
1984: xasprintf(&chost, "%s.", lname);
1985: debug2("%s: chost %s", __func__, chost);
1.84 markus 1986:
1.68 markus 1987: /* construct data */
1.223 djm 1988: if ((b = sshbuf_new()) == NULL) {
1989: error("%s: sshbuf_new failed", __func__);
1990: goto out;
1991: }
1992: if ((r = sshkey_to_blob(private, &keyblob, &keylen)) != 0) {
1993: error("%s: sshkey_to_blob: %s", __func__, ssh_err(r));
1994: goto out;
1995: }
1996: if ((r = sshbuf_put_string(b, session_id2, session_id2_len)) != 0 ||
1997: (r = sshbuf_put_u8(b, SSH2_MSG_USERAUTH_REQUEST)) != 0 ||
1998: (r = sshbuf_put_cstring(b, authctxt->server_user)) != 0 ||
1.267 djm 1999: (r = sshbuf_put_cstring(b, authctxt->service)) != 0 ||
1.223 djm 2000: (r = sshbuf_put_cstring(b, authctxt->method->name)) != 0 ||
1.279 markus 2001: (r = sshbuf_put_cstring(b, sshkey_ssh_name(private))) != 0 ||
1.223 djm 2002: (r = sshbuf_put_string(b, keyblob, keylen)) != 0 ||
2003: (r = sshbuf_put_cstring(b, chost)) != 0 ||
2004: (r = sshbuf_put_cstring(b, authctxt->local_user)) != 0) {
2005: error("%s: buffer error: %s", __func__, ssh_err(r));
2006: goto out;
2007: }
2008:
1.68 markus 2009: #ifdef DEBUG_PK
1.223 djm 2010: sshbuf_dump(b, stderr);
1.68 markus 2011: #endif
1.281 dtucker 2012: r = ssh_keysign(private, &sig, &siglen,
2013: sshbuf_ptr(b), sshbuf_len(b));
1.223 djm 2014: if (r != 0) {
2015: error("sign using hostkey %s %s failed",
2016: sshkey_ssh_name(private), fp);
2017: goto out;
2018: }
2019: if ((r = sshpkt_start(ssh, SSH2_MSG_USERAUTH_REQUEST)) != 0 ||
2020: (r = sshpkt_put_cstring(ssh, authctxt->server_user)) != 0 ||
2021: (r = sshpkt_put_cstring(ssh, authctxt->service)) != 0 ||
2022: (r = sshpkt_put_cstring(ssh, authctxt->method->name)) != 0 ||
1.279 markus 2023: (r = sshpkt_put_cstring(ssh, sshkey_ssh_name(private))) != 0 ||
1.223 djm 2024: (r = sshpkt_put_string(ssh, keyblob, keylen)) != 0 ||
2025: (r = sshpkt_put_cstring(ssh, chost)) != 0 ||
2026: (r = sshpkt_put_cstring(ssh, authctxt->local_user)) != 0 ||
2027: (r = sshpkt_put_string(ssh, sig, siglen)) != 0 ||
2028: (r = sshpkt_send(ssh)) != 0) {
2029: error("%s: packet error: %s", __func__, ssh_err(r));
2030: goto out;
2031: }
2032: success = 1;
2033:
2034: out:
1.278 markus 2035: if (sig != NULL)
2036: freezero(sig, siglen);
1.223 djm 2037: free(keyblob);
2038: free(lname);
2039: free(fp);
1.197 djm 2040: free(chost);
1.223 djm 2041: sshkey_free(private);
2042: sshbuf_free(b);
1.68 markus 2043:
1.223 djm 2044: return success;
1.23 markus 2045: }
1.170 djm 2046:
1.20 markus 2047: /* find auth method */
2048:
2049: /*
2050: * given auth method name, if configurable options permit this method fill
2051: * in auth_ident field and return true, otherwise return false.
2052: */
1.76 itojun 2053: static int
1.20 markus 2054: authmethod_is_enabled(Authmethod *method)
2055: {
2056: if (method == NULL)
2057: return 0;
2058: /* return false if options indicate this method is disabled */
2059: if (method->enabled == NULL || *method->enabled == 0)
2060: return 0;
2061: /* return false if batch mode is enabled but method needs interactive mode */
2062: if (method->batch_flag != NULL && *method->batch_flag != 0)
2063: return 0;
2064: return 1;
2065: }
2066:
1.76 itojun 2067: static Authmethod *
1.20 markus 2068: authmethod_lookup(const char *name)
1.1 markus 2069: {
1.20 markus 2070: Authmethod *method = NULL;
2071: if (name != NULL)
2072: for (method = authmethods; method->name != NULL; method++)
2073: if (strcmp(name, method->name) == 0)
2074: return method;
2075: debug2("Unrecognized authentication method name: %s", name ? name : "NULL");
2076: return NULL;
2077: }
1.1 markus 2078:
1.53 markus 2079: /* XXX internal state */
2080: static Authmethod *current = NULL;
2081: static char *supported = NULL;
2082: static char *preferred = NULL;
1.105 deraadt 2083:
1.20 markus 2084: /*
2085: * Given the authentication method list sent by the server, return the
2086: * next method we should try. If the server initially sends a nil list,
1.67 markus 2087: * use a built-in default list.
1.41 stevesk 2088: */
1.76 itojun 2089: static Authmethod *
1.20 markus 2090: authmethod_get(char *authlist)
2091: {
1.53 markus 2092: char *name = NULL;
1.97 markus 2093: u_int next;
1.41 stevesk 2094:
1.20 markus 2095: /* Use a suitable default if we're passed a nil list. */
2096: if (authlist == NULL || strlen(authlist) == 0)
1.53 markus 2097: authlist = options.preferred_authentications;
1.20 markus 2098:
1.53 markus 2099: if (supported == NULL || strcmp(authlist, supported) != 0) {
2100: debug3("start over, passed a different list %s", authlist);
1.197 djm 2101: free(supported);
1.53 markus 2102: supported = xstrdup(authlist);
2103: preferred = options.preferred_authentications;
2104: debug3("preferred %s", preferred);
2105: current = NULL;
2106: } else if (current != NULL && authmethod_is_enabled(current))
2107: return current;
1.20 markus 2108:
1.53 markus 2109: for (;;) {
2110: if ((name = match_list(preferred, supported, &next)) == NULL) {
1.109 markus 2111: debug("No more authentication methods to try.");
1.53 markus 2112: current = NULL;
2113: return NULL;
2114: }
2115: preferred += next;
1.23 markus 2116: debug3("authmethod_lookup %s", name);
1.53 markus 2117: debug3("remaining preferred: %s", preferred);
2118: if ((current = authmethod_lookup(name)) != NULL &&
2119: authmethod_is_enabled(current)) {
1.23 markus 2120: debug3("authmethod_is_enabled %s", name);
1.109 markus 2121: debug("Next authentication method: %s", name);
1.197 djm 2122: free(name);
1.53 markus 2123: return current;
1.23 markus 2124: }
1.198 dtucker 2125: free(name);
1.1 markus 2126: }
1.53 markus 2127: }
1.1 markus 2128:
1.79 stevesk 2129: static char *
1.53 markus 2130: authmethods_get(void)
2131: {
2132: Authmethod *method = NULL;
1.278 markus 2133: struct sshbuf *b;
1.93 markus 2134: char *list;
1.278 markus 2135: int r;
1.27 provos 2136:
1.278 markus 2137: if ((b = sshbuf_new()) == NULL)
2138: fatal("%s: sshbuf_new failed", __func__);
1.53 markus 2139: for (method = authmethods; method->name != NULL; method++) {
2140: if (authmethod_is_enabled(method)) {
1.278 markus 2141: if ((r = sshbuf_putf(b, "%s%s",
2142: sshbuf_len(b) ? "," : "", method->name)) != 0)
2143: fatal("%s: buffer error: %s",
2144: __func__, ssh_err(r));
1.53 markus 2145: }
2146: }
1.278 markus 2147: if ((list = sshbuf_dup_string(b)) == NULL)
1.242 djm 2148: fatal("%s: sshbuf_dup_string failed", __func__);
1.278 markus 2149: sshbuf_free(b);
1.93 markus 2150: return list;
1.1 markus 2151: }
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