Annotation of src/usr.bin/ssh/sshconnect2.c, Revision 1.306
1.306 ! deraadt 1: /* $OpenBSD: sshconnect2.c,v 1.305 2019/05/31 03:20:07 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
1.293 djm 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)
1.294 djm 191: ssh_packet_set_rekey_limits(ssh, options.rekey_limit,
1.254 dtucker 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
1.301 djm 198: ssh->kex->kex[KEX_DH_GRP1_SHA1] = kex_gen_client;
199: ssh->kex->kex[KEX_DH_GRP14_SHA1] = kex_gen_client;
200: ssh->kex->kex[KEX_DH_GRP14_SHA256] = kex_gen_client;
201: ssh->kex->kex[KEX_DH_GRP16_SHA512] = kex_gen_client;
202: ssh->kex->kex[KEX_DH_GRP18_SHA512] = kex_gen_client;
1.291 djm 203: ssh->kex->kex[KEX_DH_GEX_SHA1] = kexgex_client;
204: ssh->kex->kex[KEX_DH_GEX_SHA256] = kexgex_client;
1.301 djm 205: ssh->kex->kex[KEX_ECDH_SHA2] = kex_gen_client;
1.207 markus 206: #endif
1.301 djm 207: ssh->kex->kex[KEX_C25519_SHA256] = kex_gen_client;
208: ssh->kex->kex[KEX_KEM_SNTRUP4591761X25519_SHA512] = kex_gen_client;
1.291 djm 209: ssh->kex->verify_host_key=&verify_host_key_callback;
1.22 provos 210:
1.291 djm 211: ssh_dispatch_run_fatal(ssh, DISPATCH_BLOCK, &ssh->kex->done);
1.173 andreas 212:
1.231 markus 213: /* remove ext-info from the KEX proposals for rekeying */
214: myproposal[PROPOSAL_KEX_ALGS] =
1.284 djm 215: compat_kex_proposal(options.kex_algorithms);
1.291 djm 216: if ((r = kex_prop2buf(ssh->kex->my, myproposal)) != 0)
1.231 markus 217: fatal("kex_prop2buf: %s", ssh_err(r));
1.62 markus 218:
1.291 djm 219: session_id2 = ssh->kex->session_id;
220: session_id2_len = ssh->kex->session_id_len;
1.22 provos 221:
222: #ifdef DEBUG_KEXDH
223: /* send 1st encrypted/maced/compressed message */
1.278 markus 224: if ((r = sshpkt_start(ssh, SSH2_MSG_IGNORE)) != 0 ||
225: (r = sshpkt_put_cstring(ssh, "markus")) != 0 ||
1.280 markus 226: (r = sshpkt_send(ssh)) != 0 ||
227: (r = ssh_packet_write_wait(ssh)) != 0)
1.278 markus 228: fatal("%s: %s", __func__, ssh_err(r));
1.22 provos 229: #endif
1.1 markus 230: }
1.11 markus 231:
1.1 markus 232: /*
233: * Authenticate user
234: */
1.20 markus 235:
1.214 djm 236: typedef struct cauthctxt Authctxt;
237: typedef struct cauthmethod Authmethod;
1.117 markus 238: typedef struct identity Identity;
239: typedef struct idlist Idlist;
1.20 markus 240:
1.117 markus 241: struct identity {
242: TAILQ_ENTRY(identity) next;
1.214 djm 243: int agent_fd; /* >=0 if agent supports key */
244: struct sshkey *key; /* public/private key */
1.117 markus 245: char *filename; /* comment for agent-only keys */
246: int tried;
247: int isprivate; /* key points to the private key */
1.191 dtucker 248: int userprovided;
1.117 markus 249: };
250: TAILQ_HEAD(idlist, identity);
1.20 markus 251:
1.214 djm 252: struct cauthctxt {
1.20 markus 253: const char *server_user;
1.68 markus 254: const char *local_user;
1.20 markus 255: const char *host;
256: const char *service;
1.214 djm 257: struct cauthmethod *method;
1.183 djm 258: sig_atomic_t success;
1.51 markus 259: char *authlist;
1.302 djm 260: #ifdef GSSAPI
261: /* gssapi */
262: gss_OID_set gss_supported_mechs;
263: u_int mech_tried;
264: #endif
1.68 markus 265: /* pubkey */
1.214 djm 266: struct idlist keys;
267: int agent_fd;
1.68 markus 268: /* hostbased */
1.100 markus 269: Sensitive *sensitive;
1.223 djm 270: char *oktypes, *ktypes;
271: const char *active_ktype;
1.82 markus 272: /* kbd-interactive */
273: int info_req_seen;
1.292 djm 274: int attempt_kbdint;
275: /* password */
276: int attempt_passwd;
1.121 markus 277: /* generic */
278: void *methoddata;
1.20 markus 279: };
1.214 djm 280:
281: struct cauthmethod {
1.20 markus 282: char *name; /* string to compare against server's list */
1.295 djm 283: int (*userauth)(struct ssh *ssh);
284: void (*cleanup)(struct ssh *ssh);
1.20 markus 285: int *enabled; /* flag in option struct that enables method */
286: int *batch_flag; /* flag in option struct that disables method */
287: };
288:
1.302 djm 289: static int input_userauth_service_accept(int, u_int32_t, struct ssh *);
290: static int input_userauth_ext_info(int, u_int32_t, struct ssh *);
291: static int input_userauth_success(int, u_int32_t, struct ssh *);
292: static int input_userauth_failure(int, u_int32_t, struct ssh *);
293: static int input_userauth_banner(int, u_int32_t, struct ssh *);
294: static int input_userauth_error(int, u_int32_t, struct ssh *);
295: static int input_userauth_info_req(int, u_int32_t, struct ssh *);
296: static int input_userauth_pk_ok(int, u_int32_t, struct ssh *);
297: static int input_userauth_passwd_changereq(int, u_int32_t, struct ssh *);
298:
299: static int userauth_none(struct ssh *);
300: static int userauth_pubkey(struct ssh *);
301: static int userauth_passwd(struct ssh *);
302: static int userauth_kbdint(struct ssh *);
303: static int userauth_hostbased(struct ssh *);
1.20 markus 304:
1.121 markus 305: #ifdef GSSAPI
1.302 djm 306: static int userauth_gssapi(struct ssh *);
307: static void userauth_gssapi_cleanup(struct ssh *);
308: static int input_gssapi_response(int type, u_int32_t, struct ssh *);
309: static int input_gssapi_token(int type, u_int32_t, struct ssh *);
310: static int input_gssapi_error(int, u_int32_t, struct ssh *);
311: static int input_gssapi_errtok(int, u_int32_t, struct ssh *);
1.121 markus 312: #endif
313:
1.295 djm 314: void userauth(struct ssh *, char *);
1.51 markus 315:
1.303 djm 316: static void pubkey_cleanup(struct ssh *);
1.295 djm 317: static int sign_and_send_pubkey(struct ssh *ssh, Identity *);
1.117 markus 318: static void pubkey_prepare(Authctxt *);
1.251 djm 319: static void pubkey_reset(Authctxt *);
1.259 markus 320: static struct sshkey *load_identity_file(Identity *);
1.76 itojun 321:
322: static Authmethod *authmethod_get(char *authlist);
323: static Authmethod *authmethod_lookup(const char *name);
324: static char *authmethods_get(void);
1.20 markus 325:
326: Authmethod authmethods[] = {
1.121 markus 327: #ifdef GSSAPI
1.132 markus 328: {"gssapi-with-mic",
1.121 markus 329: userauth_gssapi,
1.302 djm 330: userauth_gssapi_cleanup,
1.121 markus 331: &options.gss_authentication,
332: NULL},
333: #endif
1.81 markus 334: {"hostbased",
335: userauth_hostbased,
1.170 djm 336: NULL,
1.81 markus 337: &options.hostbased_authentication,
338: NULL},
1.20 markus 339: {"publickey",
340: userauth_pubkey,
1.303 djm 341: NULL,
1.28 markus 342: &options.pubkey_authentication,
1.20 markus 343: NULL},
1.81 markus 344: {"keyboard-interactive",
345: userauth_kbdint,
1.170 djm 346: NULL,
1.81 markus 347: &options.kbd_interactive_authentication,
348: &options.batch_mode},
1.20 markus 349: {"password",
350: userauth_passwd,
1.170 djm 351: NULL,
1.20 markus 352: &options.password_authentication,
1.23 markus 353: &options.batch_mode},
354: {"none",
355: userauth_none,
356: NULL,
1.170 djm 357: NULL,
1.23 markus 358: NULL},
1.170 djm 359: {NULL, NULL, NULL, NULL, NULL}
1.20 markus 360: };
361:
362: void
1.291 djm 363: ssh_userauth2(struct ssh *ssh, const char *local_user,
364: const char *server_user, char *host, Sensitive *sensitive)
1.20 markus 365: {
366: Authctxt authctxt;
1.231 markus 367: int r;
1.39 markus 368:
1.73 markus 369: if (options.challenge_response_authentication)
1.39 markus 370: options.kbd_interactive_authentication = 1;
1.53 markus 371: if (options.preferred_authentications == NULL)
372: options.preferred_authentications = authmethods_get();
373:
1.20 markus 374: /* setup authentication context */
1.82 markus 375: memset(&authctxt, 0, sizeof(authctxt));
1.20 markus 376: authctxt.server_user = server_user;
1.68 markus 377: authctxt.local_user = local_user;
1.20 markus 378: authctxt.host = host;
379: authctxt.service = "ssh-connection"; /* service name */
380: authctxt.success = 0;
1.23 markus 381: authctxt.method = authmethod_lookup("none");
1.51 markus 382: authctxt.authlist = NULL;
1.121 markus 383: authctxt.methoddata = NULL;
1.100 markus 384: authctxt.sensitive = sensitive;
1.223 djm 385: authctxt.active_ktype = authctxt.oktypes = authctxt.ktypes = NULL;
1.82 markus 386: authctxt.info_req_seen = 0;
1.292 djm 387: authctxt.attempt_kbdint = 0;
388: authctxt.attempt_passwd = 0;
1.302 djm 389: #if GSSAPI
390: authctxt.gss_supported_mechs = NULL;
391: authctxt.mech_tried = 0;
392: #endif
1.215 djm 393: authctxt.agent_fd = -1;
1.289 djm 394: pubkey_prepare(&authctxt);
1.291 djm 395: if (authctxt.method == NULL) {
396: fatal("%s: internal error: cannot send userauth none request",
397: __func__);
398: }
1.20 markus 399:
1.231 markus 400: if ((r = sshpkt_start(ssh, SSH2_MSG_SERVICE_REQUEST)) != 0 ||
401: (r = sshpkt_put_cstring(ssh, "ssh-userauth")) != 0 ||
402: (r = sshpkt_send(ssh)) != 0)
403: fatal("%s: %s", __func__, ssh_err(r));
404:
1.260 markus 405: ssh->authctxt = &authctxt;
1.231 markus 406: ssh_dispatch_init(ssh, &input_userauth_error);
407: ssh_dispatch_set(ssh, SSH2_MSG_EXT_INFO, &input_userauth_ext_info);
408: ssh_dispatch_set(ssh, SSH2_MSG_SERVICE_ACCEPT, &input_userauth_service_accept);
1.263 markus 409: ssh_dispatch_run_fatal(ssh, DISPATCH_BLOCK, &authctxt.success); /* loop until success */
1.303 djm 410: pubkey_cleanup(ssh);
1.260 markus 411: ssh->authctxt = NULL;
1.20 markus 412:
1.231 markus 413: ssh_dispatch_range(ssh, SSH2_MSG_USERAUTH_MIN, SSH2_MSG_USERAUTH_MAX, NULL);
1.119 markus 414:
1.248 dtucker 415: if (!authctxt.success)
416: fatal("Authentication failed.");
1.109 markus 417: debug("Authentication succeeded (%s).", authctxt.method->name);
1.20 markus 418: }
1.119 markus 419:
1.231 markus 420: /* ARGSUSED */
1.302 djm 421: static int
1.261 markus 422: input_userauth_service_accept(int type, u_int32_t seq, struct ssh *ssh)
1.231 markus 423: {
424: int r;
425:
426: if (ssh_packet_remaining(ssh) > 0) {
427: char *reply;
428:
429: if ((r = sshpkt_get_cstring(ssh, &reply, NULL)) != 0)
430: goto out;
431: debug2("service_accept: %s", reply);
432: free(reply);
433: } else {
434: debug2("buggy server: service_accept w/o service");
435: }
436: if ((r = sshpkt_get_end(ssh)) != 0)
437: goto out;
438: debug("SSH2_MSG_SERVICE_ACCEPT received");
439:
440: /* initial userauth request */
1.295 djm 441: userauth_none(ssh);
1.231 markus 442:
443: ssh_dispatch_set(ssh, SSH2_MSG_EXT_INFO, &input_userauth_error);
444: ssh_dispatch_set(ssh, SSH2_MSG_USERAUTH_SUCCESS, &input_userauth_success);
445: ssh_dispatch_set(ssh, SSH2_MSG_USERAUTH_FAILURE, &input_userauth_failure);
446: ssh_dispatch_set(ssh, SSH2_MSG_USERAUTH_BANNER, &input_userauth_banner);
447: r = 0;
448: out:
449: return r;
450: }
451:
452: /* ARGSUSED */
1.302 djm 453: static int
1.261 markus 454: input_userauth_ext_info(int type, u_int32_t seqnr, struct ssh *ssh)
1.231 markus 455: {
1.261 markus 456: return kex_input_ext_info(type, seqnr, ssh);
1.231 markus 457: }
458:
1.20 markus 459: void
1.295 djm 460: userauth(struct ssh *ssh, char *authlist)
1.51 markus 461: {
1.295 djm 462: Authctxt *authctxt = (Authctxt *)ssh->authctxt;
1.278 markus 463:
1.170 djm 464: if (authctxt->method != NULL && authctxt->method->cleanup != NULL)
1.295 djm 465: authctxt->method->cleanup(ssh);
1.170 djm 466:
1.197 djm 467: free(authctxt->methoddata);
468: authctxt->methoddata = NULL;
1.51 markus 469: if (authlist == NULL) {
470: authlist = authctxt->authlist;
471: } else {
1.197 djm 472: free(authctxt->authlist);
1.51 markus 473: authctxt->authlist = authlist;
474: }
475: for (;;) {
476: Authmethod *method = authmethod_get(authlist);
477: if (method == NULL)
1.264 dtucker 478: fatal("%s@%s: Permission denied (%s).",
479: authctxt->server_user, authctxt->host, authlist);
1.51 markus 480: authctxt->method = method;
1.119 markus 481:
482: /* reset the per method handler */
1.278 markus 483: ssh_dispatch_range(ssh, SSH2_MSG_USERAUTH_PER_METHOD_MIN,
1.119 markus 484: SSH2_MSG_USERAUTH_PER_METHOD_MAX, NULL);
485:
486: /* and try new method */
1.295 djm 487: if (method->userauth(ssh) != 0) {
1.51 markus 488: debug2("we sent a %s packet, wait for reply", method->name);
489: break;
490: } else {
491: debug2("we did not send a packet, disable method");
492: method->enabled = NULL;
493: }
494: }
495: }
1.105 deraadt 496:
1.169 djm 497: /* ARGSUSED */
1.302 djm 498: static int
1.261 markus 499: input_userauth_error(int type, u_int32_t seq, struct ssh *ssh)
1.20 markus 500: {
1.295 djm 501: fatal("%s: bad message during authentication: type %d", __func__, type);
1.218 markus 502: return 0;
1.35 markus 503: }
1.105 deraadt 504:
1.169 djm 505: /* ARGSUSED */
1.302 djm 506: static int
1.261 markus 507: input_userauth_banner(int type, u_int32_t seq, struct ssh *ssh)
1.35 markus 508: {
1.295 djm 509: char *msg = NULL;
1.294 djm 510: size_t len;
511: int r;
1.126 deraadt 512:
1.246 djm 513: debug3("%s", __func__);
1.294 djm 514: if ((r = sshpkt_get_cstring(ssh, &msg, &len)) != 0 ||
1.295 djm 515: (r = sshpkt_get_cstring(ssh, NULL, NULL)) != 0)
1.294 djm 516: goto out;
1.246 djm 517: if (len > 0 && options.log_level >= SYSLOG_LEVEL_INFO)
518: fmprintf(stderr, "%s", msg);
1.294 djm 519: r = 0;
520: out:
1.246 djm 521: free(msg);
1.294 djm 522: return r;
1.20 markus 523: }
1.105 deraadt 524:
1.169 djm 525: /* ARGSUSED */
1.302 djm 526: static int
1.261 markus 527: input_userauth_success(int type, u_int32_t seq, struct ssh *ssh)
1.20 markus 528: {
1.260 markus 529: Authctxt *authctxt = ssh->authctxt;
1.172 djm 530:
1.20 markus 531: if (authctxt == NULL)
1.295 djm 532: fatal("%s: no authentication context", __func__);
1.197 djm 533: free(authctxt->authlist);
534: authctxt->authlist = NULL;
1.172 djm 535: if (authctxt->method != NULL && authctxt->method->cleanup != NULL)
1.295 djm 536: authctxt->method->cleanup(ssh);
1.197 djm 537: free(authctxt->methoddata);
538: authctxt->methoddata = NULL;
1.20 markus 539: authctxt->success = 1; /* break out */
1.218 markus 540: return 0;
1.20 markus 541: }
1.105 deraadt 542:
1.302 djm 543: #if 0
544: static int
1.261 markus 545: input_userauth_success_unexpected(int type, u_int32_t seq, struct ssh *ssh)
1.172 djm 546: {
1.260 markus 547: Authctxt *authctxt = ssh->authctxt;
1.172 djm 548:
549: if (authctxt == NULL)
550: fatal("%s: no authentication context", __func__);
551:
552: fatal("Unexpected authentication success during %s.",
553: authctxt->method->name);
1.218 markus 554: return 0;
1.172 djm 555: }
1.302 djm 556: #endif
1.172 djm 557:
1.169 djm 558: /* ARGSUSED */
1.302 djm 559: static int
1.261 markus 560: input_userauth_failure(int type, u_int32_t seq, struct ssh *ssh)
1.20 markus 561: {
1.260 markus 562: Authctxt *authctxt = ssh->authctxt;
1.20 markus 563: char *authlist = NULL;
1.278 markus 564: u_char partial;
565: int r;
1.20 markus 566:
567: if (authctxt == NULL)
568: fatal("input_userauth_failure: no authentication context");
569:
1.278 markus 570: if ((r = sshpkt_get_cstring(ssh, &authlist, NULL)) != 0 ||
571: (r = sshpkt_get_u8(ssh, &partial)) != 0 ||
572: (r = sshpkt_get_end(ssh)) != 0)
573: goto out;
1.20 markus 574:
1.193 markus 575: if (partial != 0) {
1.247 dtucker 576: verbose("Authenticated with partial success.");
1.193 markus 577: /* reset state */
1.251 djm 578: pubkey_reset(authctxt);
1.193 markus 579: }
1.109 markus 580: debug("Authentications that can continue: %s", authlist);
1.20 markus 581:
1.295 djm 582: userauth(ssh, authlist);
1.278 markus 583: authlist = NULL;
584: out:
585: free(authlist);
1.218 markus 586: return 0;
1.51 markus 587: }
1.169 djm 588:
1.287 djm 589: /*
590: * Format an identity for logging including filename, key type, fingerprint
591: * and location (agent, etc.). Caller must free.
592: */
593: static char *
594: format_identity(Identity *id)
595: {
596: char *fp = NULL, *ret = NULL;
597:
598: if (id->key != NULL) {
599: fp = sshkey_fingerprint(id->key, options.fingerprint_hash,
600: SSH_FP_DEFAULT);
601: }
602: xasprintf(&ret, "%s %s%s%s%s%s%s",
603: id->filename,
604: id->key ? sshkey_type(id->key) : "", id->key ? " " : "",
605: fp ? fp : "",
606: id->userprovided ? " explicit" : "",
607: (id->key && (id->key->flags & SSHKEY_FLAG_EXT)) ? " token" : "",
608: id->agent_fd != -1 ? " agent" : "");
609: free(fp);
610: return ret;
611: }
612:
1.169 djm 613: /* ARGSUSED */
1.302 djm 614: static int
1.261 markus 615: input_userauth_pk_ok(int type, u_int32_t seq, struct ssh *ssh)
1.51 markus 616: {
1.260 markus 617: Authctxt *authctxt = ssh->authctxt;
1.259 markus 618: struct sshkey *key = NULL;
1.117 markus 619: Identity *id = NULL;
1.287 djm 620: int pktype, found = 0, sent = 0;
1.278 markus 621: size_t blen;
1.287 djm 622: char *pkalg = NULL, *fp = NULL, *ident = NULL;
1.278 markus 623: u_char *pkblob = NULL;
624: int r;
1.51 markus 625:
626: if (authctxt == NULL)
627: fatal("input_userauth_pk_ok: no authentication context");
1.267 djm 628:
1.278 markus 629: if ((r = sshpkt_get_cstring(ssh, &pkalg, NULL)) != 0 ||
630: (r = sshpkt_get_string(ssh, &pkblob, &blen)) != 0 ||
631: (r = sshpkt_get_end(ssh)) != 0)
632: goto done;
1.51 markus 633:
1.278 markus 634: if ((pktype = sshkey_type_from_name(pkalg)) == KEY_UNSPEC) {
1.287 djm 635: debug("%s: server sent unknown pkalg %s", __func__, pkalg);
1.117 markus 636: goto done;
637: }
1.278 markus 638: if ((r = sshkey_from_blob(pkblob, blen, &key)) != 0) {
639: debug("no key from blob. pkalg %s: %s", pkalg, ssh_err(r));
1.117 markus 640: goto done;
641: }
642: if (key->type != pktype) {
643: error("input_userauth_pk_ok: type mismatch "
644: "for decoded key (received %d, expected %d)",
645: key->type, pktype);
646: goto done;
647: }
648:
1.127 markus 649: /*
650: * search keys in the reverse order, because last candidate has been
651: * moved to the end of the queue. this also avoids confusion by
652: * duplicate keys
653: */
1.136 henning 654: TAILQ_FOREACH_REVERSE(id, &authctxt->keys, idlist, next) {
1.278 markus 655: if (sshkey_equal(key, id->key)) {
1.287 djm 656: found = 1;
1.51 markus 657: break;
658: }
1.117 markus 659: }
1.287 djm 660: if (!found || id == NULL) {
661: fp = sshkey_fingerprint(key, options.fingerprint_hash,
662: SSH_FP_DEFAULT);
663: error("%s: server replied with unknown key: %s %s", __func__,
664: sshkey_type(key), fp == NULL ? "<ERROR>" : fp);
665: goto done;
666: }
667: ident = format_identity(id);
668: debug("Server accepts key: %s", ident);
1.295 djm 669: sent = sign_and_send_pubkey(ssh, id);
1.278 markus 670: r = 0;
671: done:
672: sshkey_free(key);
1.287 djm 673: free(ident);
674: free(fp);
1.197 djm 675: free(pkalg);
676: free(pkblob);
1.51 markus 677:
1.106 deraadt 678: /* try another method if we did not send a packet */
1.278 markus 679: if (r == 0 && sent == 0)
1.295 djm 680: userauth(ssh, NULL);
1.278 markus 681: return r;
1.20 markus 682: }
1.121 markus 683:
684: #ifdef GSSAPI
1.302 djm 685: static int
1.295 djm 686: userauth_gssapi(struct ssh *ssh)
1.121 markus 687: {
1.295 djm 688: Authctxt *authctxt = (Authctxt *)ssh->authctxt;
1.121 markus 689: Gssctxt *gssctxt = NULL;
690: OM_uint32 min;
1.278 markus 691: int r, ok = 0;
1.302 djm 692: gss_OID mech = NULL;
1.121 markus 693:
694: /* Try one GSSAPI method at a time, rather than sending them all at
695: * once. */
696:
1.302 djm 697: if (authctxt->gss_supported_mechs == NULL)
698: gss_indicate_mechs(&min, &authctxt->gss_supported_mechs);
1.121 markus 699:
1.302 djm 700: /* Check to see whether the mechanism is usable before we offer it */
701: while (authctxt->mech_tried < authctxt->gss_supported_mechs->count &&
702: !ok) {
703: mech = &authctxt->gss_supported_mechs->
704: elements[authctxt->mech_tried];
1.121 markus 705: /* My DER encoding requires length<128 */
1.302 djm 706: if (mech->length < 128 && ssh_gssapi_check_mechanism(&gssctxt,
707: mech, authctxt->host)) {
1.121 markus 708: ok = 1; /* Mechanism works */
709: } else {
1.302 djm 710: authctxt->mech_tried++;
1.121 markus 711: }
712: }
713:
1.302 djm 714: if (!ok || mech == NULL)
1.139 djm 715: return 0;
1.121 markus 716:
717: authctxt->methoddata=(void *)gssctxt;
718:
1.278 markus 719: if ((r = sshpkt_start(ssh, SSH2_MSG_USERAUTH_REQUEST)) != 0 ||
720: (r = sshpkt_put_cstring(ssh, authctxt->server_user)) != 0 ||
721: (r = sshpkt_put_cstring(ssh, authctxt->service)) != 0 ||
722: (r = sshpkt_put_cstring(ssh, authctxt->method->name)) != 0 ||
723: (r = sshpkt_put_u32(ssh, 1)) != 0 ||
1.302 djm 724: (r = sshpkt_put_u32(ssh, (mech->length) + 2)) != 0 ||
1.278 markus 725: (r = sshpkt_put_u8(ssh, SSH_GSS_OIDTYPE)) != 0 ||
1.302 djm 726: (r = sshpkt_put_u8(ssh, mech->length)) != 0 ||
727: (r = sshpkt_put(ssh, mech->elements, mech->length)) != 0 ||
1.278 markus 728: (r = sshpkt_send(ssh)) != 0)
729: fatal("%s: %s", __func__, ssh_err(r));
730:
731: ssh_dispatch_set(ssh, SSH2_MSG_USERAUTH_GSSAPI_RESPONSE, &input_gssapi_response);
732: ssh_dispatch_set(ssh, SSH2_MSG_USERAUTH_GSSAPI_TOKEN, &input_gssapi_token);
733: ssh_dispatch_set(ssh, SSH2_MSG_USERAUTH_GSSAPI_ERROR, &input_gssapi_error);
734: ssh_dispatch_set(ssh, SSH2_MSG_USERAUTH_GSSAPI_ERRTOK, &input_gssapi_errtok);
1.121 markus 735:
1.302 djm 736: authctxt->mech_tried++; /* Move along to next candidate */
1.121 markus 737:
738: return 1;
739: }
740:
1.302 djm 741: static void
742: userauth_gssapi_cleanup(struct ssh *ssh)
743: {
744: Authctxt *authctxt = (Authctxt *)ssh->authctxt;
745: Gssctxt *gssctxt = (Gssctxt *)authctxt->methoddata;
746:
747: ssh_gssapi_delete_ctx(&gssctxt);
748: authctxt->methoddata = NULL;
749:
750: free(authctxt->gss_supported_mechs);
751: authctxt->gss_supported_mechs = NULL;
752: }
753:
1.130 markus 754: static OM_uint32
1.262 djm 755: process_gssapi_token(struct ssh *ssh, gss_buffer_t recv_tok)
1.130 markus 756: {
1.260 markus 757: Authctxt *authctxt = ssh->authctxt;
1.130 markus 758: Gssctxt *gssctxt = authctxt->methoddata;
759: gss_buffer_desc send_tok = GSS_C_EMPTY_BUFFER;
1.142 djm 760: gss_buffer_desc mic = GSS_C_EMPTY_BUFFER;
761: gss_buffer_desc gssbuf;
1.132 markus 762: OM_uint32 status, ms, flags;
1.278 markus 763: int r;
1.133 djm 764:
1.130 markus 765: status = ssh_gssapi_init_ctx(gssctxt, options.gss_deleg_creds,
1.132 markus 766: recv_tok, &send_tok, &flags);
1.130 markus 767:
768: if (send_tok.length > 0) {
1.278 markus 769: u_char type = GSS_ERROR(status) ?
770: SSH2_MSG_USERAUTH_GSSAPI_ERRTOK :
771: SSH2_MSG_USERAUTH_GSSAPI_TOKEN;
772:
773: if ((r = sshpkt_start(ssh, type)) != 0 ||
774: (r = sshpkt_put_string(ssh, send_tok.value,
775: send_tok.length)) != 0 ||
776: (r = sshpkt_send(ssh)) != 0)
777: fatal("%s: %s", __func__, ssh_err(r));
1.133 djm 778:
1.130 markus 779: gss_release_buffer(&ms, &send_tok);
780: }
1.133 djm 781:
1.130 markus 782: if (status == GSS_S_COMPLETE) {
1.132 markus 783: /* send either complete or MIC, depending on mechanism */
784: if (!(flags & GSS_C_INTEG_FLAG)) {
1.278 markus 785: if ((r = sshpkt_start(ssh,
786: SSH2_MSG_USERAUTH_GSSAPI_EXCHANGE_COMPLETE)) != 0 ||
787: (r = sshpkt_send(ssh)) != 0)
788: fatal("%s: %s", __func__, ssh_err(r));
1.132 markus 789: } else {
1.278 markus 790: struct sshbuf *b;
791:
792: if ((b = sshbuf_new()) == NULL)
793: fatal("%s: sshbuf_new failed", __func__);
794: ssh_gssapi_buildmic(b, authctxt->server_user,
1.132 markus 795: authctxt->service, "gssapi-with-mic");
796:
1.278 markus 797: if ((gssbuf.value = sshbuf_mutable_ptr(b)) == NULL)
798: fatal("%s: sshbuf_mutable_ptr failed", __func__);
799: gssbuf.length = sshbuf_len(b);
1.133 djm 800:
1.132 markus 801: status = ssh_gssapi_sign(gssctxt, &gssbuf, &mic);
1.133 djm 802:
1.132 markus 803: if (!GSS_ERROR(status)) {
1.278 markus 804: if ((r = sshpkt_start(ssh,
805: SSH2_MSG_USERAUTH_GSSAPI_MIC)) != 0 ||
806: (r = sshpkt_put_string(ssh, mic.value,
807: mic.length)) != 0 ||
808: (r = sshpkt_send(ssh)) != 0)
809: fatal("%s: %s", __func__, ssh_err(r));
1.132 markus 810: }
1.133 djm 811:
1.278 markus 812: sshbuf_free(b);
1.132 markus 813: gss_release_buffer(&ms, &mic);
1.133 djm 814: }
1.130 markus 815: }
1.133 djm 816:
1.130 markus 817: return status;
818: }
819:
1.169 djm 820: /* ARGSUSED */
1.302 djm 821: static int
1.261 markus 822: input_gssapi_response(int type, u_int32_t plen, struct ssh *ssh)
1.121 markus 823: {
1.260 markus 824: Authctxt *authctxt = ssh->authctxt;
1.121 markus 825: Gssctxt *gssctxt;
1.278 markus 826: size_t oidlen;
827: u_char *oidv = NULL;
828: int r;
1.121 markus 829:
830: if (authctxt == NULL)
831: fatal("input_gssapi_response: no authentication context");
832: gssctxt = authctxt->methoddata;
833:
834: /* Setup our OID */
1.278 markus 835: if ((r = sshpkt_get_string(ssh, &oidv, &oidlen)) != 0)
836: goto done;
1.121 markus 837:
1.129 markus 838: if (oidlen <= 2 ||
839: oidv[0] != SSH_GSS_OIDTYPE ||
840: oidv[1] != oidlen - 2) {
841: debug("Badly encoded mechanism OID received");
1.296 djm 842: userauth(ssh, NULL);
1.278 markus 843: goto ok;
1.121 markus 844: }
1.129 markus 845:
846: if (!ssh_gssapi_check_oid(gssctxt, oidv + 2, oidlen - 2))
847: fatal("Server returned different OID than expected");
1.121 markus 848:
1.278 markus 849: if ((r = sshpkt_get_end(ssh)) != 0)
850: goto done;
1.121 markus 851:
1.262 djm 852: if (GSS_ERROR(process_gssapi_token(ssh, GSS_C_NO_BUFFER))) {
1.121 markus 853: /* Start again with next method on list */
854: debug("Trying to start again");
1.296 djm 855: userauth(ssh, NULL);
1.278 markus 856: goto ok;
1.121 markus 857: }
1.278 markus 858: ok:
859: r = 0;
860: done:
861: free(oidv);
862: return r;
1.121 markus 863: }
864:
1.169 djm 865: /* ARGSUSED */
1.302 djm 866: static int
1.261 markus 867: input_gssapi_token(int type, u_int32_t plen, struct ssh *ssh)
1.121 markus 868: {
1.260 markus 869: Authctxt *authctxt = ssh->authctxt;
1.121 markus 870: gss_buffer_desc recv_tok;
1.278 markus 871: u_char *p = NULL;
872: size_t len;
1.130 markus 873: OM_uint32 status;
1.278 markus 874: int r;
1.121 markus 875:
876: if (authctxt == NULL)
877: fatal("input_gssapi_response: no authentication context");
878:
1.278 markus 879: if ((r = sshpkt_get_string(ssh, &p, &len)) != 0 ||
880: (r = sshpkt_get_end(ssh)) != 0)
881: goto out;
1.121 markus 882:
1.278 markus 883: recv_tok.value = p;
884: recv_tok.length = len;
1.262 djm 885: status = process_gssapi_token(ssh, &recv_tok);
1.121 markus 886:
1.278 markus 887: /* Start again with the next method in the list */
1.121 markus 888: if (GSS_ERROR(status)) {
1.296 djm 889: userauth(ssh, NULL);
1.278 markus 890: /* ok */
1.121 markus 891: }
1.278 markus 892: r = 0;
893: out:
894: free(p);
895: return r;
1.121 markus 896: }
897:
1.169 djm 898: /* ARGSUSED */
1.302 djm 899: static int
1.261 markus 900: input_gssapi_errtok(int type, u_int32_t plen, struct ssh *ssh)
1.121 markus 901: {
1.260 markus 902: Authctxt *authctxt = ssh->authctxt;
1.121 markus 903: Gssctxt *gssctxt;
904: gss_buffer_desc send_tok = GSS_C_EMPTY_BUFFER;
905: gss_buffer_desc recv_tok;
1.194 djm 906: OM_uint32 ms;
1.278 markus 907: u_char *p = NULL;
908: size_t len;
909: int r;
1.121 markus 910:
911: if (authctxt == NULL)
912: fatal("input_gssapi_response: no authentication context");
913: gssctxt = authctxt->methoddata;
914:
1.278 markus 915: if ((r = sshpkt_get_string(ssh, &p, &len)) != 0 ||
916: (r = sshpkt_get_end(ssh)) != 0) {
917: free(p);
918: return r;
919: }
1.121 markus 920:
921: /* Stick it into GSSAPI and see what it says */
1.278 markus 922: recv_tok.value = p;
923: recv_tok.length = len;
1.194 djm 924: (void)ssh_gssapi_init_ctx(gssctxt, options.gss_deleg_creds,
1.140 djm 925: &recv_tok, &send_tok, NULL);
1.278 markus 926: free(p);
1.121 markus 927: gss_release_buffer(&ms, &send_tok);
928:
929: /* Server will be returning a failed packet after this one */
1.220 djm 930: return 0;
1.121 markus 931: }
932:
1.169 djm 933: /* ARGSUSED */
1.302 djm 934: static int
1.261 markus 935: input_gssapi_error(int type, u_int32_t plen, struct ssh *ssh)
1.121 markus 936: {
1.278 markus 937: char *msg = NULL;
938: char *lang = NULL;
939: int r;
1.121 markus 940:
1.278 markus 941: if ((r = sshpkt_get_u32(ssh, NULL)) != 0 || /* maj */
942: (r = sshpkt_get_u32(ssh, NULL)) != 0 || /* min */
943: (r = sshpkt_get_cstring(ssh, &msg, NULL)) != 0 ||
944: (r = sshpkt_get_cstring(ssh, &lang, NULL)) != 0)
945: goto out;
946: r = sshpkt_get_end(ssh);
1.143 stevesk 947: debug("Server GSSAPI Error:\n%s", msg);
1.278 markus 948: out:
1.197 djm 949: free(msg);
950: free(lang);
1.278 markus 951: return r;
1.121 markus 952: }
953: #endif /* GSSAPI */
1.20 markus 954:
1.302 djm 955: static int
1.295 djm 956: userauth_none(struct ssh *ssh)
1.23 markus 957: {
1.295 djm 958: Authctxt *authctxt = (Authctxt *)ssh->authctxt;
1.278 markus 959: int r;
960:
1.23 markus 961: /* initial userauth request */
1.278 markus 962: if ((r = sshpkt_start(ssh, SSH2_MSG_USERAUTH_REQUEST)) != 0 ||
963: (r = sshpkt_put_cstring(ssh, authctxt->server_user)) != 0 ||
964: (r = sshpkt_put_cstring(ssh, authctxt->service)) != 0 ||
965: (r = sshpkt_put_cstring(ssh, authctxt->method->name)) != 0 ||
966: (r = sshpkt_send(ssh)) != 0)
967: fatal("%s: %s", __func__, ssh_err(r));
1.23 markus 968: return 1;
969: }
970:
1.302 djm 971: static int
1.295 djm 972: userauth_passwd(struct ssh *ssh)
1.1 markus 973: {
1.295 djm 974: Authctxt *authctxt = (Authctxt *)ssh->authctxt;
1.290 djm 975: char *password, *prompt = NULL;
1.175 dtucker 976: const char *host = options.host_key_alias ? options.host_key_alias :
977: authctxt->host;
1.278 markus 978: int r;
1.6 markus 979:
1.292 djm 980: if (authctxt->attempt_passwd++ >= options.number_of_password_prompts)
1.6 markus 981: return 0;
1.13 todd 982:
1.292 djm 983: if (authctxt->attempt_passwd != 1)
1.13 todd 984: error("Permission denied, please try again.");
1.1 markus 985:
1.290 djm 986: xasprintf(&prompt, "%s@%s's password: ", authctxt->server_user, host);
1.1 markus 987: password = read_passphrase(prompt, 0);
1.278 markus 988: if ((r = sshpkt_start(ssh, SSH2_MSG_USERAUTH_REQUEST)) != 0 ||
989: (r = sshpkt_put_cstring(ssh, authctxt->server_user)) != 0 ||
990: (r = sshpkt_put_cstring(ssh, authctxt->service)) != 0 ||
991: (r = sshpkt_put_cstring(ssh, authctxt->method->name)) != 0 ||
992: (r = sshpkt_put_u8(ssh, 0)) != 0 ||
993: (r = sshpkt_put_cstring(ssh, password)) != 0 ||
994: (r = sshpkt_add_padding(ssh, 64)) != 0 ||
995: (r = sshpkt_send(ssh)) != 0)
996: fatal("%s: %s", __func__, ssh_err(r));
1.99 markus 997:
1.290 djm 998: free(prompt);
999: if (password != NULL)
1.278 markus 1000: freezero(password, strlen(password));
1001:
1002: ssh_dispatch_set(ssh, SSH2_MSG_USERAUTH_PASSWD_CHANGEREQ,
1.99 markus 1003: &input_userauth_passwd_changereq);
1004:
1.1 markus 1005: return 1;
1006: }
1.169 djm 1007:
1.99 markus 1008: /*
1009: * parse PASSWD_CHANGEREQ, prompt user and send SSH2_MSG_USERAUTH_REQUEST
1010: */
1.169 djm 1011: /* ARGSUSED */
1.302 djm 1012: static int
1.261 markus 1013: input_userauth_passwd_changereq(int type, u_int32_t seqnr, struct ssh *ssh)
1.99 markus 1014: {
1.260 markus 1015: Authctxt *authctxt = ssh->authctxt;
1.278 markus 1016: char *info = NULL, *lang = NULL, *password = NULL, *retype = NULL;
1.266 dtucker 1017: char prompt[256];
1.252 djm 1018: const char *host;
1.278 markus 1019: int r;
1.99 markus 1020:
1021: debug2("input_userauth_passwd_changereq");
1022:
1023: if (authctxt == NULL)
1024: fatal("input_userauth_passwd_changereq: "
1025: "no authentication context");
1.252 djm 1026: host = options.host_key_alias ? options.host_key_alias : authctxt->host;
1.99 markus 1027:
1.278 markus 1028: if ((r = sshpkt_get_cstring(ssh, &info, NULL)) != 0 ||
1029: (r = sshpkt_get_cstring(ssh, &lang, NULL)) != 0)
1030: goto out;
1.99 markus 1031: if (strlen(info) > 0)
1.116 itojun 1032: logit("%s", info);
1.278 markus 1033: if ((r = sshpkt_start(ssh, SSH2_MSG_USERAUTH_REQUEST)) != 0 ||
1034: (r = sshpkt_put_cstring(ssh, authctxt->server_user)) != 0 ||
1035: (r = sshpkt_put_cstring(ssh, authctxt->service)) != 0 ||
1036: (r = sshpkt_put_cstring(ssh, authctxt->method->name)) != 0 ||
1037: (r = sshpkt_put_u8(ssh, 1)) != 0) /* additional info */
1038: goto out;
1039:
1.104 deraadt 1040: snprintf(prompt, sizeof(prompt),
1.99 markus 1041: "Enter %.30s@%.128s's old password: ",
1.175 dtucker 1042: authctxt->server_user, host);
1.99 markus 1043: password = read_passphrase(prompt, 0);
1.278 markus 1044: if ((r = sshpkt_put_cstring(ssh, password)) != 0)
1045: goto out;
1046:
1047: freezero(password, strlen(password));
1.99 markus 1048: password = NULL;
1049: while (password == NULL) {
1.104 deraadt 1050: snprintf(prompt, sizeof(prompt),
1.99 markus 1051: "Enter %.30s@%.128s's new password: ",
1.175 dtucker 1052: authctxt->server_user, host);
1.99 markus 1053: password = read_passphrase(prompt, RP_ALLOW_EOF);
1054: if (password == NULL) {
1055: /* bail out */
1.278 markus 1056: r = 0;
1057: goto out;
1.99 markus 1058: }
1.104 deraadt 1059: snprintf(prompt, sizeof(prompt),
1.99 markus 1060: "Retype %.30s@%.128s's new password: ",
1.175 dtucker 1061: authctxt->server_user, host);
1.99 markus 1062: retype = read_passphrase(prompt, 0);
1063: if (strcmp(password, retype) != 0) {
1.278 markus 1064: freezero(password, strlen(password));
1.116 itojun 1065: logit("Mismatch; try again, EOF to quit.");
1.99 markus 1066: password = NULL;
1067: }
1.278 markus 1068: freezero(retype, strlen(retype));
1.99 markus 1069: }
1.278 markus 1070: if ((r = sshpkt_put_cstring(ssh, password)) != 0 ||
1071: (r = sshpkt_add_padding(ssh, 64)) != 0 ||
1072: (r = sshpkt_send(ssh)) != 0)
1073: goto out;
1.104 deraadt 1074:
1.278 markus 1075: ssh_dispatch_set(ssh, SSH2_MSG_USERAUTH_PASSWD_CHANGEREQ,
1.99 markus 1076: &input_userauth_passwd_changereq);
1.278 markus 1077: r = 0;
1078: out:
1079: if (password)
1080: freezero(password, strlen(password));
1081: free(info);
1082: free(lang);
1083: return r;
1.117 markus 1084: }
1085:
1.272 djm 1086: /*
1087: * Select an algorithm for publickey signatures.
1088: * Returns algorithm (caller must free) or NULL if no mutual algorithm found.
1089: *
1090: * Call with ssh==NULL to ignore server-sig-algs extension list and
1091: * only attempt with the key's base signature type.
1092: */
1093: static char *
1094: key_sig_algorithm(struct ssh *ssh, const struct sshkey *key)
1.231 markus 1095: {
1.274 djm 1096: char *allowed, *oallowed, *cp, *tmp, *alg = NULL;
1.231 markus 1097:
1.272 djm 1098: /*
1099: * The signature algorithm will only differ from the key algorithm
1100: * for RSA keys/certs and when the server advertises support for
1101: * newer (SHA2) algorithms.
1102: */
1103: if (ssh == NULL || ssh->kex->server_sig_algs == NULL ||
1.288 djm 1104: (key->type != KEY_RSA && key->type != KEY_RSA_CERT) ||
1105: (key->type == KEY_RSA_CERT && (datafellows & SSH_BUG_SIGTYPE))) {
1.272 djm 1106: /* Filter base key signature alg against our configuration */
1.279 markus 1107: return match_list(sshkey_ssh_name(key),
1.272 djm 1108: options.pubkey_key_types, NULL);
1.231 markus 1109: }
1110:
1.272 djm 1111: /*
1112: * For RSA keys/certs, since these might have a different sig type:
1113: * find the first entry in PubkeyAcceptedKeyTypes of the right type
1114: * that also appears in the supported signature algorithms list from
1115: * the server.
1116: */
1117: oallowed = allowed = xstrdup(options.pubkey_key_types);
1118: while ((cp = strsep(&allowed, ",")) != NULL) {
1119: if (sshkey_type_from_name(cp) != key->type)
1120: continue;
1.274 djm 1121: tmp = match_list(sshkey_sigalg_by_name(cp), ssh->kex->server_sig_algs, NULL);
1122: if (tmp != NULL)
1123: alg = xstrdup(cp);
1124: free(tmp);
1.272 djm 1125: if (alg != NULL)
1126: break;
1.269 djm 1127: }
1.272 djm 1128: free(oallowed);
1129: return alg;
1.269 djm 1130: }
1131:
1.117 markus 1132: static int
1.214 djm 1133: identity_sign(struct identity *id, u_char **sigp, size_t *lenp,
1.272 djm 1134: const u_char *data, size_t datalen, u_int compat, const char *alg)
1.117 markus 1135: {
1.259 markus 1136: struct sshkey *prv;
1.269 djm 1137: int r;
1.99 markus 1138:
1.272 djm 1139: /* The agent supports this key. */
1.269 djm 1140: if (id->key != NULL && id->agent_fd != -1) {
1.272 djm 1141: return ssh_agent_sign(id->agent_fd, id->key, sigp, lenp,
1142: data, datalen, alg, compat);
1.269 djm 1143: }
1.214 djm 1144:
1.117 markus 1145: /*
1.272 djm 1146: * We have already loaded the private key or the private key is
1147: * stored in external hardware.
1.117 markus 1148: */
1.255 djm 1149: if (id->key != NULL &&
1.272 djm 1150: (id->isprivate || (id->key->flags & SSHKEY_FLAG_EXT))) {
1151: if ((r = sshkey_sign(id->key, sigp, lenp, data, datalen,
1152: alg, compat)) != 0)
1153: return r;
1154: /*
1155: * PKCS#11 tokens may not support all signature algorithms,
1156: * so check what we get back.
1157: */
1158: if ((r = sshkey_check_sigtype(*sigp, *lenp, alg)) != 0)
1159: return r;
1160: return 0;
1161: }
1.255 djm 1162:
1.272 djm 1163: /* Load the private key from the file. */
1.229 jcs 1164: if ((prv = load_identity_file(id)) == NULL)
1.239 djm 1165: return SSH_ERR_KEY_NOT_FOUND;
1.265 djm 1166: if (id->key != NULL && !sshkey_equal_public(prv, id->key)) {
1167: error("%s: private key %s contents do not match public",
1168: __func__, id->filename);
1169: return SSH_ERR_KEY_NOT_FOUND;
1170: }
1.272 djm 1171: r = sshkey_sign(prv, sigp, lenp, data, datalen, alg, compat);
1.214 djm 1172: sshkey_free(prv);
1.269 djm 1173: return r;
1.51 markus 1174: }
1175:
1.76 itojun 1176: static int
1.255 djm 1177: id_filename_matches(Identity *id, Identity *private_id)
1178: {
1179: const char *suffixes[] = { ".pub", "-cert.pub", NULL };
1180: size_t len = strlen(id->filename), plen = strlen(private_id->filename);
1181: size_t i, slen;
1182:
1183: if (strcmp(id->filename, private_id->filename) == 0)
1184: return 1;
1185: for (i = 0; suffixes[i]; i++) {
1186: slen = strlen(suffixes[i]);
1187: if (len > slen && plen == len - slen &&
1188: strcmp(id->filename + (len - slen), suffixes[i]) == 0 &&
1189: memcmp(id->filename, private_id->filename, plen) == 0)
1190: return 1;
1191: }
1192: return 0;
1193: }
1194:
1195: static int
1.295 djm 1196: sign_and_send_pubkey(struct ssh *ssh, Identity *id)
1.1 markus 1197: {
1.295 djm 1198: Authctxt *authctxt = (Authctxt *)ssh->authctxt;
1.272 djm 1199: struct sshbuf *b = NULL;
1200: Identity *private_id, *sign_id = NULL;
1201: u_char *signature = NULL;
1202: size_t slen = 0, skip = 0;
1203: int r, fallback_sigtype, sent = 0;
1204: char *alg = NULL, *fp = NULL;
1205: const char *loc = "";
1.1 markus 1206:
1.222 djm 1207: if ((fp = sshkey_fingerprint(id->key, options.fingerprint_hash,
1208: SSH_FP_DEFAULT)) == NULL)
1209: return 0;
1.51 markus 1210:
1.272 djm 1211: debug3("%s: %s %s", __func__, sshkey_type(id->key), fp);
1.1 markus 1212:
1.227 djm 1213: /*
1214: * If the key is an certificate, try to find a matching private key
1215: * and use it to complete the signature.
1.241 djm 1216: * If no such private key exists, fall back to trying the certificate
1217: * key itself in case it has a private half already loaded.
1.272 djm 1218: * This will try to set sign_id to the private key that will perform
1219: * the signature.
1.227 djm 1220: */
1.272 djm 1221: if (sshkey_is_cert(id->key)) {
1.227 djm 1222: TAILQ_FOREACH(private_id, &authctxt->keys, next) {
1223: if (sshkey_equal_public(id->key, private_id->key) &&
1224: id->key->type != private_id->key->type) {
1.272 djm 1225: sign_id = private_id;
1.227 djm 1226: break;
1227: }
1228: }
1.255 djm 1229: /*
1230: * Exact key matches are preferred, but also allow
1231: * filename matches for non-PKCS#11/agent keys that
1232: * didn't load public keys. This supports the case
1233: * of keeping just a private key file and public
1234: * certificate on disk.
1235: */
1.272 djm 1236: if (sign_id == NULL &&
1237: !id->isprivate && id->agent_fd == -1 &&
1.255 djm 1238: (id->key->flags & SSHKEY_FLAG_EXT) == 0) {
1239: TAILQ_FOREACH(private_id, &authctxt->keys, next) {
1240: if (private_id->key == NULL &&
1241: id_filename_matches(id, private_id)) {
1.272 djm 1242: sign_id = private_id;
1.255 djm 1243: break;
1244: }
1245: }
1246: }
1.272 djm 1247: if (sign_id != NULL) {
1.227 djm 1248: debug2("%s: using private key \"%s\"%s for "
1249: "certificate", __func__, id->filename,
1250: id->agent_fd != -1 ? " from agent" : "");
1251: } else {
1.240 djm 1252: debug("%s: no separate private key for certificate "
1.227 djm 1253: "\"%s\"", __func__, id->filename);
1254: }
1255: }
1256:
1.272 djm 1257: /*
1258: * If the above didn't select another identity to do the signing
1259: * then default to the one we started with.
1260: */
1261: if (sign_id == NULL)
1262: sign_id = id;
1263:
1264: /* assemble and sign data */
1265: for (fallback_sigtype = 0; fallback_sigtype <= 1; fallback_sigtype++) {
1266: free(alg);
1267: slen = 0;
1268: signature = NULL;
1269: if ((alg = key_sig_algorithm(fallback_sigtype ? NULL : ssh,
1270: id->key)) == NULL) {
1271: error("%s: no mutual signature supported", __func__);
1272: goto out;
1273: }
1274: debug3("%s: signing using %s", __func__, alg);
1275:
1276: sshbuf_free(b);
1277: if ((b = sshbuf_new()) == NULL)
1278: fatal("%s: sshbuf_new failed", __func__);
1279: if (datafellows & SSH_OLD_SESSIONID) {
1280: if ((r = sshbuf_put(b, session_id2,
1281: session_id2_len)) != 0) {
1282: fatal("%s: sshbuf_put: %s",
1283: __func__, ssh_err(r));
1284: }
1285: } else {
1286: if ((r = sshbuf_put_string(b, session_id2,
1287: session_id2_len)) != 0) {
1288: fatal("%s: sshbuf_put_string: %s",
1289: __func__, ssh_err(r));
1290: }
1291: }
1.278 markus 1292: skip = sshbuf_len(b);
1.272 djm 1293: if ((r = sshbuf_put_u8(b, SSH2_MSG_USERAUTH_REQUEST)) != 0 ||
1294: (r = sshbuf_put_cstring(b, authctxt->server_user)) != 0 ||
1295: (r = sshbuf_put_cstring(b, authctxt->service)) != 0 ||
1296: (r = sshbuf_put_cstring(b, authctxt->method->name)) != 0 ||
1297: (r = sshbuf_put_u8(b, 1)) != 0 ||
1298: (r = sshbuf_put_cstring(b, alg)) != 0 ||
1299: (r = sshkey_puts(id->key, b)) != 0) {
1300: fatal("%s: assemble signed data: %s",
1301: __func__, ssh_err(r));
1302: }
1303:
1304: /* generate signature */
1305: r = identity_sign(sign_id, &signature, &slen,
1306: sshbuf_ptr(b), sshbuf_len(b), datafellows, alg);
1307: if (r == 0)
1308: break;
1309: else if (r == SSH_ERR_KEY_NOT_FOUND)
1310: goto out; /* soft failure */
1311: else if (r == SSH_ERR_SIGN_ALG_UNSUPPORTED &&
1312: !fallback_sigtype) {
1313: if (sign_id->agent_fd != -1)
1314: loc = "agent ";
1315: else if ((sign_id->key->flags & SSHKEY_FLAG_EXT) != 0)
1316: loc = "token ";
1317: logit("%skey %s %s returned incorrect signature type",
1318: loc, sshkey_type(id->key), fp);
1319: continue;
1320: }
1321: error("%s: signing failed: %s", __func__, ssh_err(r));
1322: goto out;
1.17 markus 1323: }
1.272 djm 1324: if (slen == 0 || signature == NULL) /* shouldn't happen */
1325: fatal("%s: no signature", __func__);
1.51 markus 1326:
1.1 markus 1327: /* append signature */
1.272 djm 1328: if ((r = sshbuf_put_string(b, signature, slen)) != 0)
1329: fatal("%s: append signature: %s", __func__, ssh_err(r));
1.1 markus 1330:
1.272 djm 1331: #ifdef DEBUG_PK
1332: sshbuf_dump(b, stderr);
1333: #endif
1.1 markus 1334: /* skip session id and packet type */
1.272 djm 1335: if ((r = sshbuf_consume(b, skip + 1)) != 0)
1336: fatal("%s: consume: %s", __func__, ssh_err(r));
1.1 markus 1337:
1338: /* put remaining data from buffer into packet */
1.272 djm 1339: if ((r = sshpkt_start(ssh, SSH2_MSG_USERAUTH_REQUEST)) != 0 ||
1340: (r = sshpkt_putb(ssh, b)) != 0 ||
1341: (r = sshpkt_send(ssh)) != 0)
1342: fatal("%s: enqueue request: %s", __func__, ssh_err(r));
1343:
1344: /* success */
1345: sent = 1;
1.17 markus 1346:
1.272 djm 1347: out:
1348: free(fp);
1349: free(alg);
1350: sshbuf_free(b);
1351: freezero(signature, slen);
1352: return sent;
1.16 markus 1353: }
1354:
1.76 itojun 1355: static int
1.295 djm 1356: send_pubkey_test(struct ssh *ssh, Identity *id)
1.20 markus 1357: {
1.295 djm 1358: Authctxt *authctxt = (Authctxt *)ssh->authctxt;
1.272 djm 1359: u_char *blob = NULL;
1360: char *alg = NULL;
1.278 markus 1361: size_t bloblen;
1362: u_int have_sig = 0;
1363: int sent = 0, r;
1.20 markus 1364:
1.272 djm 1365: if ((alg = key_sig_algorithm(ssh, id->key)) == NULL) {
1366: debug("%s: no mutual signature algorithm", __func__);
1367: goto out;
1368: }
1.16 markus 1369:
1.278 markus 1370: if ((r = sshkey_to_blob(id->key, &blob, &bloblen)) != 0) {
1.51 markus 1371: /* we cannot handle this key */
1.272 djm 1372: debug3("%s: cannot handle key", __func__);
1373: goto out;
1.16 markus 1374: }
1.51 markus 1375: /* register callback for USERAUTH_PK_OK message */
1.278 markus 1376: ssh_dispatch_set(ssh, SSH2_MSG_USERAUTH_PK_OK, &input_userauth_pk_ok);
1.51 markus 1377:
1.278 markus 1378: if ((r = sshpkt_start(ssh, SSH2_MSG_USERAUTH_REQUEST)) != 0 ||
1379: (r = sshpkt_put_cstring(ssh, authctxt->server_user)) != 0 ||
1380: (r = sshpkt_put_cstring(ssh, authctxt->service)) != 0 ||
1381: (r = sshpkt_put_cstring(ssh, authctxt->method->name)) != 0 ||
1382: (r = sshpkt_put_u8(ssh, have_sig)) != 0 ||
1383: (r = sshpkt_put_cstring(ssh, alg)) != 0 ||
1384: (r = sshpkt_put_string(ssh, blob, bloblen)) != 0 ||
1385: (r = sshpkt_send(ssh)) != 0)
1386: fatal("%s: %s", __func__, ssh_err(r));
1.272 djm 1387: sent = 1;
1.278 markus 1388:
1389: out:
1.272 djm 1390: free(alg);
1.197 djm 1391: free(blob);
1.272 djm 1392: return sent;
1.51 markus 1393: }
1394:
1.259 markus 1395: static struct sshkey *
1.229 jcs 1396: load_identity_file(Identity *id)
1.51 markus 1397: {
1.259 markus 1398: struct sshkey *private = NULL;
1.229 jcs 1399: char prompt[300], *passphrase, *comment;
1.215 djm 1400: int r, perm_ok = 0, quit = 0, i;
1.52 markus 1401: struct stat st;
1.16 markus 1402:
1.306 ! deraadt 1403: if (stat(id->filename, &st) == -1) {
1.229 jcs 1404: (id->userprovided ? logit : debug3)("no such identity: %s: %s",
1405: id->filename, strerror(errno));
1.52 markus 1406: return NULL;
1407: }
1.214 djm 1408: snprintf(prompt, sizeof prompt,
1.229 jcs 1409: "Enter passphrase for key '%.100s': ", id->filename);
1.214 djm 1410: for (i = 0; i <= options.number_of_password_prompts; i++) {
1411: if (i == 0)
1412: passphrase = "";
1413: else {
1.20 markus 1414: passphrase = read_passphrase(prompt, 0);
1.214 djm 1415: if (*passphrase == '\0') {
1.20 markus 1416: debug2("no passphrase given, try next key");
1.214 djm 1417: free(passphrase);
1418: break;
1419: }
1420: }
1.229 jcs 1421: switch ((r = sshkey_load_private_type(KEY_UNSPEC, id->filename,
1422: passphrase, &private, &comment, &perm_ok))) {
1.214 djm 1423: case 0:
1424: break;
1425: case SSH_ERR_KEY_WRONG_PASSPHRASE:
1426: if (options.batch_mode) {
1427: quit = 1;
1428: break;
1429: }
1.215 djm 1430: if (i != 0)
1431: debug2("bad passphrase given, try again...");
1.214 djm 1432: break;
1433: case SSH_ERR_SYSTEM_ERROR:
1434: if (errno == ENOENT) {
1435: debug2("Load key \"%s\": %s",
1.229 jcs 1436: id->filename, ssh_err(r));
1.51 markus 1437: quit = 1;
1.214 djm 1438: break;
1.20 markus 1439: }
1.214 djm 1440: /* FALLTHROUGH */
1441: default:
1.229 jcs 1442: error("Load key \"%s\": %s", id->filename, ssh_err(r));
1.214 djm 1443: quit = 1;
1444: break;
1445: }
1.230 djm 1446: if (!quit && private != NULL && id->agent_fd == -1 &&
1.229 jcs 1447: !(id->key && id->isprivate))
1448: maybe_add_key_to_agent(id->filename, private, comment,
1449: passphrase);
1.278 markus 1450: if (i > 0)
1451: freezero(passphrase, strlen(passphrase));
1.232 mmcc 1452: free(comment);
1.214 djm 1453: if (private != NULL || quit)
1454: break;
1.16 markus 1455: }
1.51 markus 1456: return private;
1457: }
1458:
1.272 djm 1459: static int
1460: key_type_allowed_by_config(struct sshkey *key)
1461: {
1462: if (match_pattern_list(sshkey_ssh_name(key),
1463: options.pubkey_key_types, 0) == 1)
1464: return 1;
1465:
1466: /* RSA keys/certs might be allowed by alternate signature types */
1467: switch (key->type) {
1468: case KEY_RSA:
1469: if (match_pattern_list("rsa-sha2-512",
1470: options.pubkey_key_types, 0) == 1)
1471: return 1;
1472: if (match_pattern_list("rsa-sha2-256",
1473: options.pubkey_key_types, 0) == 1)
1474: return 1;
1475: break;
1476: case KEY_RSA_CERT:
1477: if (match_pattern_list("rsa-sha2-512-cert-v01@openssh.com",
1478: options.pubkey_key_types, 0) == 1)
1479: return 1;
1480: if (match_pattern_list("rsa-sha2-256-cert-v01@openssh.com",
1481: options.pubkey_key_types, 0) == 1)
1482: return 1;
1483: break;
1484: }
1485: return 0;
1486: }
1487:
1488:
1.117 markus 1489: /*
1490: * try keys in the following order:
1.227 djm 1491: * 1. certificates listed in the config file
1492: * 2. other input certificates
1493: * 3. agent keys that are found in the config file
1494: * 4. other agent keys
1495: * 5. keys that are only listed in the config file
1.117 markus 1496: */
1497: static void
1498: pubkey_prepare(Authctxt *authctxt)
1.51 markus 1499: {
1.214 djm 1500: struct identity *id, *id2, *tmp;
1501: struct idlist agent, files, *preferred;
1502: struct sshkey *key;
1.230 djm 1503: int agent_fd = -1, i, r, found;
1.214 djm 1504: size_t j;
1505: struct ssh_identitylist *idlist;
1.287 djm 1506: char *ident;
1.51 markus 1507:
1.117 markus 1508: TAILQ_INIT(&agent); /* keys from the agent */
1509: TAILQ_INIT(&files); /* keys from the config file */
1510: preferred = &authctxt->keys;
1511: TAILQ_INIT(preferred); /* preferred order of keys */
1512:
1.190 djm 1513: /* list of keys stored in the filesystem and PKCS#11 */
1.117 markus 1514: for (i = 0; i < options.num_identity_files; i++) {
1515: key = options.identity_keys[i];
1.180 djm 1516: if (key && key->cert && key->cert->type != SSH2_CERT_TYPE_USER)
1.117 markus 1517: continue;
1518: options.identity_keys[i] = NULL;
1.150 djm 1519: id = xcalloc(1, sizeof(*id));
1.230 djm 1520: id->agent_fd = -1;
1.117 markus 1521: id->key = key;
1522: id->filename = xstrdup(options.identity_files[i]);
1.192 dtucker 1523: id->userprovided = options.identity_file_userprovided[i];
1.117 markus 1524: TAILQ_INSERT_TAIL(&files, id, next);
1.190 djm 1525: }
1.227 djm 1526: /* list of certificates specified by user */
1527: for (i = 0; i < options.num_certificate_files; i++) {
1528: key = options.certificates[i];
1.278 markus 1529: if (!sshkey_is_cert(key) || key->cert == NULL ||
1.227 djm 1530: key->cert->type != SSH2_CERT_TYPE_USER)
1531: continue;
1532: id = xcalloc(1, sizeof(*id));
1.230 djm 1533: id->agent_fd = -1;
1.227 djm 1534: id->key = key;
1535: id->filename = xstrdup(options.certificate_files[i]);
1536: id->userprovided = options.certificate_file_userprovided[i];
1537: TAILQ_INSERT_TAIL(preferred, id, next);
1.117 markus 1538: }
1539: /* list of keys supported by the agent */
1.214 djm 1540: if ((r = ssh_get_authentication_socket(&agent_fd)) != 0) {
1541: if (r != SSH_ERR_AGENT_NOT_PRESENT)
1542: debug("%s: ssh_get_authentication_socket: %s",
1543: __func__, ssh_err(r));
1.258 naddy 1544: } else if ((r = ssh_fetch_identitylist(agent_fd, &idlist)) != 0) {
1.214 djm 1545: if (r != SSH_ERR_AGENT_NO_IDENTITIES)
1546: debug("%s: ssh_fetch_identitylist: %s",
1547: __func__, ssh_err(r));
1.237 markus 1548: close(agent_fd);
1.214 djm 1549: } else {
1550: for (j = 0; j < idlist->nkeys; j++) {
1.117 markus 1551: found = 0;
1552: TAILQ_FOREACH(id, &files, next) {
1.214 djm 1553: /*
1554: * agent keys from the config file are
1555: * preferred
1556: */
1557: if (sshkey_equal(idlist->keys[j], id->key)) {
1.117 markus 1558: TAILQ_REMOVE(&files, id, next);
1559: TAILQ_INSERT_TAIL(preferred, id, next);
1.214 djm 1560: id->agent_fd = agent_fd;
1.117 markus 1561: found = 1;
1562: break;
1563: }
1564: }
1.135 markus 1565: if (!found && !options.identities_only) {
1.150 djm 1566: id = xcalloc(1, sizeof(*id));
1.214 djm 1567: /* XXX "steals" key/comment from idlist */
1568: id->key = idlist->keys[j];
1569: id->filename = idlist->comments[j];
1570: idlist->keys[j] = NULL;
1571: idlist->comments[j] = NULL;
1572: id->agent_fd = agent_fd;
1.117 markus 1573: TAILQ_INSERT_TAIL(&agent, id, next);
1574: }
1575: }
1.214 djm 1576: ssh_free_identitylist(idlist);
1.117 markus 1577: /* append remaining agent keys */
1578: for (id = TAILQ_FIRST(&agent); id; id = TAILQ_FIRST(&agent)) {
1579: TAILQ_REMOVE(&agent, id, next);
1580: TAILQ_INSERT_TAIL(preferred, id, next);
1581: }
1.214 djm 1582: authctxt->agent_fd = agent_fd;
1.244 djm 1583: }
1584: /* Prefer PKCS11 keys that are explicitly listed */
1585: TAILQ_FOREACH_SAFE(id, &files, next, tmp) {
1586: if (id->key == NULL || (id->key->flags & SSHKEY_FLAG_EXT) == 0)
1587: continue;
1588: found = 0;
1589: TAILQ_FOREACH(id2, &files, next) {
1590: if (id2->key == NULL ||
1591: (id2->key->flags & SSHKEY_FLAG_EXT) == 0)
1592: continue;
1593: if (sshkey_equal(id->key, id2->key)) {
1594: TAILQ_REMOVE(&files, id, next);
1595: TAILQ_INSERT_TAIL(preferred, id, next);
1596: found = 1;
1597: break;
1598: }
1599: }
1600: /* If IdentitiesOnly set and key not found then don't use it */
1601: if (!found && options.identities_only) {
1602: TAILQ_REMOVE(&files, id, next);
1.278 markus 1603: freezero(id, sizeof(*id));
1.244 djm 1604: }
1.117 markus 1605: }
1606: /* append remaining keys from the config file */
1607: for (id = TAILQ_FIRST(&files); id; id = TAILQ_FIRST(&files)) {
1608: TAILQ_REMOVE(&files, id, next);
1609: TAILQ_INSERT_TAIL(preferred, id, next);
1610: }
1.228 djm 1611: /* finally, filter by PubkeyAcceptedKeyTypes */
1612: TAILQ_FOREACH_SAFE(id, preferred, next, id2) {
1.273 djm 1613: if (id->key != NULL && !key_type_allowed_by_config(id->key)) {
1.228 djm 1614: debug("Skipping %s key %s - "
1615: "not in PubkeyAcceptedKeyTypes",
1616: sshkey_ssh_name(id->key), id->filename);
1617: TAILQ_REMOVE(preferred, id, next);
1618: sshkey_free(id->key);
1619: free(id->filename);
1620: memset(id, 0, sizeof(*id));
1621: continue;
1622: }
1.117 markus 1623: }
1.287 djm 1624: /* List the keys we plan on using */
1625: TAILQ_FOREACH_SAFE(id, preferred, next, id2) {
1626: ident = format_identity(id);
1627: debug("Will attempt key: %s", ident);
1628: free(ident);
1629: }
1630: debug2("%s: done", __func__);
1.17 markus 1631: }
1632:
1.117 markus 1633: static void
1.303 djm 1634: pubkey_cleanup(struct ssh *ssh)
1.51 markus 1635: {
1.302 djm 1636: Authctxt *authctxt = (Authctxt *)ssh->authctxt;
1.117 markus 1637: Identity *id;
1.51 markus 1638:
1.289 djm 1639: if (authctxt->agent_fd != -1) {
1.214 djm 1640: ssh_close_authentication_socket(authctxt->agent_fd);
1.289 djm 1641: authctxt->agent_fd = -1;
1642: }
1.117 markus 1643: for (id = TAILQ_FIRST(&authctxt->keys); id;
1644: id = TAILQ_FIRST(&authctxt->keys)) {
1645: TAILQ_REMOVE(&authctxt->keys, id, next);
1.235 mmcc 1646: sshkey_free(id->key);
1.197 djm 1647: free(id->filename);
1648: free(id);
1.117 markus 1649: }
1.1 markus 1650: }
1651:
1.251 djm 1652: static void
1653: pubkey_reset(Authctxt *authctxt)
1654: {
1655: Identity *id;
1656:
1657: TAILQ_FOREACH(id, &authctxt->keys, next)
1658: id->tried = 0;
1659: }
1660:
1.225 markus 1661: static int
1662: try_identity(Identity *id)
1663: {
1664: if (!id->key)
1665: return (0);
1.279 markus 1666: if (sshkey_type_plain(id->key->type) == KEY_RSA &&
1.225 markus 1667: (datafellows & SSH_BUG_RSASIGMD5) != 0) {
1668: debug("Skipped %s key %s for RSA/MD5 server",
1.279 markus 1669: sshkey_type(id->key), id->filename);
1.225 markus 1670: return (0);
1671: }
1.257 djm 1672: return 1;
1.225 markus 1673: }
1674:
1.302 djm 1675: static int
1.295 djm 1676: userauth_pubkey(struct ssh *ssh)
1.20 markus 1677: {
1.295 djm 1678: Authctxt *authctxt = (Authctxt *)ssh->authctxt;
1.117 markus 1679: Identity *id;
1.20 markus 1680: int sent = 0;
1.287 djm 1681: char *ident;
1.20 markus 1682:
1.117 markus 1683: while ((id = TAILQ_FIRST(&authctxt->keys))) {
1684: if (id->tried++)
1685: return (0);
1.127 markus 1686: /* move key to the end of the queue */
1.117 markus 1687: TAILQ_REMOVE(&authctxt->keys, id, next);
1688: TAILQ_INSERT_TAIL(&authctxt->keys, id, next);
1689: /*
1690: * send a test message if we have the public key. for
1691: * encrypted keys we cannot do this and have to load the
1692: * private key instead
1693: */
1.200 djm 1694: if (id->key != NULL) {
1.225 markus 1695: if (try_identity(id)) {
1.287 djm 1696: ident = format_identity(id);
1697: debug("Offering public key: %s", ident);
1698: free(ident);
1.295 djm 1699: sent = send_pubkey_test(ssh, id);
1.200 djm 1700: }
1701: } else {
1.117 markus 1702: debug("Trying private key: %s", id->filename);
1.229 jcs 1703: id->key = load_identity_file(id);
1.117 markus 1704: if (id->key != NULL) {
1.225 markus 1705: if (try_identity(id)) {
1706: id->isprivate = 1;
1.295 djm 1707: sent = sign_and_send_pubkey(ssh, id);
1.200 djm 1708: }
1.278 markus 1709: sshkey_free(id->key);
1.117 markus 1710: id->key = NULL;
1.251 djm 1711: id->isprivate = 0;
1.51 markus 1712: }
1713: }
1.117 markus 1714: if (sent)
1715: return (sent);
1.28 markus 1716: }
1.117 markus 1717: return (0);
1.20 markus 1718: }
1719:
1.23 markus 1720: /*
1721: * Send userauth request message specifying keyboard-interactive method.
1722: */
1.302 djm 1723: static int
1.295 djm 1724: userauth_kbdint(struct ssh *ssh)
1.23 markus 1725: {
1.295 djm 1726: Authctxt *authctxt = (Authctxt *)ssh->authctxt;
1.278 markus 1727: int r;
1.23 markus 1728:
1.292 djm 1729: if (authctxt->attempt_kbdint++ >= options.number_of_password_prompts)
1.23 markus 1730: return 0;
1.82 markus 1731: /* disable if no SSH2_MSG_USERAUTH_INFO_REQUEST has been seen */
1.292 djm 1732: if (authctxt->attempt_kbdint > 1 && !authctxt->info_req_seen) {
1.82 markus 1733: debug3("userauth_kbdint: disable: no info_req_seen");
1.278 markus 1734: ssh_dispatch_set(ssh, SSH2_MSG_USERAUTH_INFO_REQUEST, NULL);
1.82 markus 1735: return 0;
1736: }
1.23 markus 1737:
1738: debug2("userauth_kbdint");
1.278 markus 1739: if ((r = sshpkt_start(ssh, SSH2_MSG_USERAUTH_REQUEST)) != 0 ||
1740: (r = sshpkt_put_cstring(ssh, authctxt->server_user)) != 0 ||
1741: (r = sshpkt_put_cstring(ssh, authctxt->service)) != 0 ||
1742: (r = sshpkt_put_cstring(ssh, authctxt->method->name)) != 0 ||
1743: (r = sshpkt_put_cstring(ssh, "")) != 0 || /* lang */
1744: (r = sshpkt_put_cstring(ssh, options.kbd_interactive_devices ?
1745: options.kbd_interactive_devices : "")) != 0 ||
1746: (r = sshpkt_send(ssh)) != 0)
1747: fatal("%s: %s", __func__, ssh_err(r));
1.23 markus 1748:
1.278 markus 1749: ssh_dispatch_set(ssh, SSH2_MSG_USERAUTH_INFO_REQUEST, &input_userauth_info_req);
1.23 markus 1750: return 1;
1751: }
1752:
1753: /*
1.46 markus 1754: * parse INFO_REQUEST, prompt user and send INFO_RESPONSE
1.23 markus 1755: */
1.302 djm 1756: static int
1.261 markus 1757: input_userauth_info_req(int type, u_int32_t seq, struct ssh *ssh)
1.23 markus 1758: {
1.260 markus 1759: Authctxt *authctxt = ssh->authctxt;
1.278 markus 1760: char *name = NULL, *inst = NULL, *lang = NULL, *prompt = NULL;
1761: char *response = NULL;
1762: u_char echo = 0;
1.32 markus 1763: u_int num_prompts, i;
1.278 markus 1764: int r;
1.23 markus 1765:
1766: debug2("input_userauth_info_req");
1767:
1768: if (authctxt == NULL)
1769: fatal("input_userauth_info_req: no authentication context");
1.82 markus 1770:
1771: authctxt->info_req_seen = 1;
1.23 markus 1772:
1.278 markus 1773: if ((r = sshpkt_get_cstring(ssh, &name, NULL)) != 0 ||
1774: (r = sshpkt_get_cstring(ssh, &inst, NULL)) != 0 ||
1775: (r = sshpkt_get_cstring(ssh, &lang, NULL)) != 0)
1776: goto out;
1.23 markus 1777: if (strlen(name) > 0)
1.116 itojun 1778: logit("%s", name);
1.23 markus 1779: if (strlen(inst) > 0)
1.116 itojun 1780: logit("%s", inst);
1.23 markus 1781:
1.278 markus 1782: if ((r = sshpkt_get_u32(ssh, &num_prompts)) != 0)
1783: goto out;
1.23 markus 1784: /*
1785: * Begin to build info response packet based on prompts requested.
1786: * We commit to providing the correct number of responses, so if
1787: * further on we run into a problem that prevents this, we have to
1788: * be sure and clean this up and send a correct error response.
1789: */
1.278 markus 1790: if ((r = sshpkt_start(ssh, SSH2_MSG_USERAUTH_INFO_RESPONSE)) != 0 ||
1791: (r = sshpkt_put_u32(ssh, num_prompts)) != 0)
1792: goto out;
1.23 markus 1793:
1.73 markus 1794: debug2("input_userauth_info_req: num_prompts %d", num_prompts);
1.23 markus 1795: for (i = 0; i < num_prompts; i++) {
1.278 markus 1796: if ((r = sshpkt_get_cstring(ssh, &prompt, NULL)) != 0 ||
1797: (r = sshpkt_get_u8(ssh, &echo)) != 0)
1798: goto out;
1.77 markus 1799: response = read_passphrase(prompt, echo ? RP_ECHO : 0);
1.278 markus 1800: if ((r = sshpkt_put_cstring(ssh, response)) != 0)
1801: goto out;
1802: freezero(response, strlen(response));
1.197 djm 1803: free(prompt);
1.278 markus 1804: response = prompt = NULL;
1.23 markus 1805: }
1.278 markus 1806: /* done with parsing incoming message. */
1807: if ((r = sshpkt_get_end(ssh)) != 0 ||
1808: (r = sshpkt_add_padding(ssh, 64)) != 0)
1809: goto out;
1810: r = sshpkt_send(ssh);
1811: out:
1812: if (response)
1813: freezero(response, strlen(response));
1814: free(prompt);
1815: free(name);
1816: free(inst);
1817: free(lang);
1818: return r;
1.68 markus 1819: }
1820:
1.100 markus 1821: static int
1.294 djm 1822: ssh_keysign(struct ssh *ssh, struct sshkey *key, u_char **sigp, size_t *lenp,
1.223 djm 1823: const u_char *data, size_t datalen)
1.100 markus 1824: {
1.223 djm 1825: struct sshbuf *b;
1.101 markus 1826: struct stat st;
1.100 markus 1827: pid_t pid;
1.304 deraadt 1828: int r, to[2], from[2], status;
1.295 djm 1829: int sock = ssh_packet_get_connection_in(ssh);
1.223 djm 1830: u_char rversion = 0, version = 2;
1831: void (*osigchld)(int);
1.100 markus 1832:
1.223 djm 1833: *sigp = NULL;
1834: *lenp = 0;
1.100 markus 1835:
1.306 ! deraadt 1836: if (stat(_PATH_SSH_KEY_SIGN, &st) == -1) {
1.223 djm 1837: error("%s: not installed: %s", __func__, strerror(errno));
1838: return -1;
1839: }
1840: if (fflush(stdout) != 0) {
1841: error("%s: fflush: %s", __func__, strerror(errno));
1.101 markus 1842: return -1;
1843: }
1.306 ! deraadt 1844: if (pipe(to) == -1) {
1.223 djm 1845: error("%s: pipe: %s", __func__, strerror(errno));
1.100 markus 1846: return -1;
1847: }
1.306 ! deraadt 1848: if (pipe(from) == -1) {
1.223 djm 1849: error("%s: pipe: %s", __func__, strerror(errno));
1.100 markus 1850: return -1;
1851: }
1.306 ! deraadt 1852: if ((pid = fork()) == -1) {
1.223 djm 1853: error("%s: fork: %s", __func__, strerror(errno));
1.100 markus 1854: return -1;
1855: }
1.223 djm 1856: osigchld = signal(SIGCHLD, SIG_DFL);
1.100 markus 1857: if (pid == 0) {
1858: close(from[0]);
1.306 ! deraadt 1859: if (dup2(from[1], STDOUT_FILENO) == -1)
1.223 djm 1860: fatal("%s: dup2: %s", __func__, strerror(errno));
1.100 markus 1861: close(to[1]);
1.306 ! deraadt 1862: if (dup2(to[0], STDIN_FILENO) == -1)
1.223 djm 1863: fatal("%s: dup2: %s", __func__, strerror(errno));
1.103 markus 1864: close(from[1]);
1865: close(to[0]);
1.304 deraadt 1866:
1.306 ! deraadt 1867: if (dup2(sock, STDERR_FILENO + 1) == -1)
1.304 deraadt 1868: fatal("%s: dup2: %s", __func__, strerror(errno));
1869: sock = STDERR_FILENO + 1;
1870: fcntl(sock, F_SETFD, 0); /* keep the socket on exec */
1.223 djm 1871: closefrom(sock + 1);
1.304 deraadt 1872:
1.223 djm 1873: debug3("%s: [child] pid=%ld, exec %s",
1874: __func__, (long)getpid(), _PATH_SSH_KEY_SIGN);
1.233 mmcc 1875: execl(_PATH_SSH_KEY_SIGN, _PATH_SSH_KEY_SIGN, (char *)NULL);
1.223 djm 1876: fatal("%s: exec(%s): %s", __func__, _PATH_SSH_KEY_SIGN,
1.100 markus 1877: strerror(errno));
1878: }
1879: close(from[1]);
1880: close(to[0]);
1.305 djm 1881: sock = STDERR_FILENO + 1;
1.100 markus 1882:
1.223 djm 1883: if ((b = sshbuf_new()) == NULL)
1884: fatal("%s: sshbuf_new failed", __func__);
1885: /* send # of sock, data to be signed */
1.253 djm 1886: if ((r = sshbuf_put_u32(b, sock)) != 0 ||
1.223 djm 1887: (r = sshbuf_put_string(b, data, datalen)) != 0)
1888: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1889: if (ssh_msg_send(to[1], version, b) == -1)
1890: fatal("%s: couldn't send request", __func__);
1891: sshbuf_reset(b);
1892: r = ssh_msg_recv(from[0], b);
1.101 markus 1893: close(from[0]);
1894: close(to[1]);
1.223 djm 1895: if (r < 0) {
1896: error("%s: no reply", __func__);
1897: goto fail;
1898: }
1.101 markus 1899:
1.223 djm 1900: errno = 0;
1.306 ! deraadt 1901: while (waitpid(pid, &status, 0) == -1) {
1.223 djm 1902: if (errno != EINTR) {
1903: error("%s: waitpid %ld: %s",
1904: __func__, (long)pid, strerror(errno));
1905: goto fail;
1906: }
1907: }
1908: if (!WIFEXITED(status)) {
1909: error("%s: exited abnormally", __func__);
1910: goto fail;
1911: }
1912: if (WEXITSTATUS(status) != 0) {
1913: error("%s: exited with status %d",
1914: __func__, WEXITSTATUS(status));
1915: goto fail;
1916: }
1917: if ((r = sshbuf_get_u8(b, &rversion)) != 0) {
1918: error("%s: buffer error: %s", __func__, ssh_err(r));
1919: goto fail;
1920: }
1921: if (rversion != version) {
1922: error("%s: bad version", __func__);
1923: goto fail;
1924: }
1925: if ((r = sshbuf_get_string(b, sigp, lenp)) != 0) {
1926: error("%s: buffer error: %s", __func__, ssh_err(r));
1927: fail:
1928: signal(SIGCHLD, osigchld);
1929: sshbuf_free(b);
1.100 markus 1930: return -1;
1931: }
1.223 djm 1932: signal(SIGCHLD, osigchld);
1933: sshbuf_free(b);
1.100 markus 1934:
1935: return 0;
1936: }
1937:
1.302 djm 1938: static int
1.295 djm 1939: userauth_hostbased(struct ssh *ssh)
1.68 markus 1940: {
1.295 djm 1941: Authctxt *authctxt = (Authctxt *)ssh->authctxt;
1.223 djm 1942: struct sshkey *private = NULL;
1943: struct sshbuf *b = NULL;
1944: u_char *sig = NULL, *keyblob = NULL;
1945: char *fp = NULL, *chost = NULL, *lname = NULL;
1946: size_t siglen = 0, keylen = 0;
1947: int i, r, success = 0;
1948:
1949: if (authctxt->ktypes == NULL) {
1950: authctxt->oktypes = xstrdup(options.hostbased_key_types);
1951: authctxt->ktypes = authctxt->oktypes;
1952: }
1.213 djm 1953:
1.223 djm 1954: /*
1955: * Work through each listed type pattern in HostbasedKeyTypes,
1956: * trying each hostkey that matches the type in turn.
1957: */
1958: for (;;) {
1959: if (authctxt->active_ktype == NULL)
1960: authctxt->active_ktype = strsep(&authctxt->ktypes, ",");
1961: if (authctxt->active_ktype == NULL ||
1962: *authctxt->active_ktype == '\0')
1963: break;
1964: debug3("%s: trying key type %s", __func__,
1965: authctxt->active_ktype);
1.68 markus 1966:
1.223 djm 1967: /* check for a useful key */
1968: private = NULL;
1969: for (i = 0; i < authctxt->sensitive->nkeys; i++) {
1970: if (authctxt->sensitive->keys[i] == NULL ||
1971: authctxt->sensitive->keys[i]->type == KEY_UNSPEC)
1972: continue;
1973: if (match_pattern_list(
1974: sshkey_ssh_name(authctxt->sensitive->keys[i]),
1.224 djm 1975: authctxt->active_ktype, 0) != 1)
1.223 djm 1976: continue;
1.68 markus 1977: /* we take and free the key */
1.223 djm 1978: private = authctxt->sensitive->keys[i];
1979: authctxt->sensitive->keys[i] = NULL;
1.68 markus 1980: break;
1981: }
1.223 djm 1982: /* Found one */
1983: if (private != NULL)
1984: break;
1985: /* No more keys of this type; advance */
1986: authctxt->active_ktype = NULL;
1.68 markus 1987: }
1.223 djm 1988: if (private == NULL) {
1989: free(authctxt->oktypes);
1990: authctxt->oktypes = authctxt->ktypes = NULL;
1991: authctxt->active_ktype = NULL;
1.109 markus 1992: debug("No more client hostkeys for hostbased authentication.");
1.223 djm 1993: goto out;
1.68 markus 1994: }
1.211 djm 1995:
1.223 djm 1996: if ((fp = sshkey_fingerprint(private, options.fingerprint_hash,
1997: SSH_FP_DEFAULT)) == NULL) {
1998: error("%s: sshkey_fingerprint failed", __func__);
1999: goto out;
1.68 markus 2000: }
1.223 djm 2001: debug("%s: trying hostkey %s %s",
2002: __func__, sshkey_ssh_name(private), fp);
1.211 djm 2003:
1.84 markus 2004: /* figure out a name for the client host */
1.295 djm 2005: lname = get_local_name(ssh_packet_get_connection_in(ssh));
2006: if (lname == NULL) {
1.223 djm 2007: error("%s: cannot get local ipaddr/name", __func__);
2008: goto out;
1.84 markus 2009: }
1.223 djm 2010:
2011: /* XXX sshbuf_put_stringf? */
2012: xasprintf(&chost, "%s.", lname);
2013: debug2("%s: chost %s", __func__, chost);
1.84 markus 2014:
1.68 markus 2015: /* construct data */
1.223 djm 2016: if ((b = sshbuf_new()) == NULL) {
2017: error("%s: sshbuf_new failed", __func__);
2018: goto out;
2019: }
2020: if ((r = sshkey_to_blob(private, &keyblob, &keylen)) != 0) {
2021: error("%s: sshkey_to_blob: %s", __func__, ssh_err(r));
2022: goto out;
2023: }
2024: if ((r = sshbuf_put_string(b, session_id2, session_id2_len)) != 0 ||
2025: (r = sshbuf_put_u8(b, SSH2_MSG_USERAUTH_REQUEST)) != 0 ||
2026: (r = sshbuf_put_cstring(b, authctxt->server_user)) != 0 ||
1.267 djm 2027: (r = sshbuf_put_cstring(b, authctxt->service)) != 0 ||
1.223 djm 2028: (r = sshbuf_put_cstring(b, authctxt->method->name)) != 0 ||
1.279 markus 2029: (r = sshbuf_put_cstring(b, sshkey_ssh_name(private))) != 0 ||
1.223 djm 2030: (r = sshbuf_put_string(b, keyblob, keylen)) != 0 ||
2031: (r = sshbuf_put_cstring(b, chost)) != 0 ||
2032: (r = sshbuf_put_cstring(b, authctxt->local_user)) != 0) {
2033: error("%s: buffer error: %s", __func__, ssh_err(r));
2034: goto out;
2035: }
2036:
1.68 markus 2037: #ifdef DEBUG_PK
1.223 djm 2038: sshbuf_dump(b, stderr);
1.68 markus 2039: #endif
1.294 djm 2040: if ((r = ssh_keysign(ssh, private, &sig, &siglen,
2041: sshbuf_ptr(b), sshbuf_len(b))) != 0) {
1.223 djm 2042: error("sign using hostkey %s %s failed",
2043: sshkey_ssh_name(private), fp);
2044: goto out;
2045: }
2046: if ((r = sshpkt_start(ssh, SSH2_MSG_USERAUTH_REQUEST)) != 0 ||
2047: (r = sshpkt_put_cstring(ssh, authctxt->server_user)) != 0 ||
2048: (r = sshpkt_put_cstring(ssh, authctxt->service)) != 0 ||
2049: (r = sshpkt_put_cstring(ssh, authctxt->method->name)) != 0 ||
1.279 markus 2050: (r = sshpkt_put_cstring(ssh, sshkey_ssh_name(private))) != 0 ||
1.223 djm 2051: (r = sshpkt_put_string(ssh, keyblob, keylen)) != 0 ||
2052: (r = sshpkt_put_cstring(ssh, chost)) != 0 ||
2053: (r = sshpkt_put_cstring(ssh, authctxt->local_user)) != 0 ||
2054: (r = sshpkt_put_string(ssh, sig, siglen)) != 0 ||
2055: (r = sshpkt_send(ssh)) != 0) {
2056: error("%s: packet error: %s", __func__, ssh_err(r));
2057: goto out;
2058: }
2059: success = 1;
2060:
2061: out:
1.278 markus 2062: if (sig != NULL)
2063: freezero(sig, siglen);
1.223 djm 2064: free(keyblob);
2065: free(lname);
2066: free(fp);
1.197 djm 2067: free(chost);
1.223 djm 2068: sshkey_free(private);
2069: sshbuf_free(b);
1.68 markus 2070:
1.223 djm 2071: return success;
1.23 markus 2072: }
1.170 djm 2073:
1.20 markus 2074: /* find auth method */
2075:
2076: /*
2077: * given auth method name, if configurable options permit this method fill
2078: * in auth_ident field and return true, otherwise return false.
2079: */
1.76 itojun 2080: static int
1.20 markus 2081: authmethod_is_enabled(Authmethod *method)
2082: {
2083: if (method == NULL)
2084: return 0;
2085: /* return false if options indicate this method is disabled */
2086: if (method->enabled == NULL || *method->enabled == 0)
2087: return 0;
2088: /* return false if batch mode is enabled but method needs interactive mode */
2089: if (method->batch_flag != NULL && *method->batch_flag != 0)
2090: return 0;
2091: return 1;
2092: }
2093:
1.76 itojun 2094: static Authmethod *
1.20 markus 2095: authmethod_lookup(const char *name)
1.1 markus 2096: {
1.20 markus 2097: Authmethod *method = NULL;
2098: if (name != NULL)
2099: for (method = authmethods; method->name != NULL; method++)
2100: if (strcmp(name, method->name) == 0)
2101: return method;
2102: debug2("Unrecognized authentication method name: %s", name ? name : "NULL");
2103: return NULL;
2104: }
1.1 markus 2105:
1.53 markus 2106: /* XXX internal state */
2107: static Authmethod *current = NULL;
2108: static char *supported = NULL;
2109: static char *preferred = NULL;
1.105 deraadt 2110:
1.20 markus 2111: /*
2112: * Given the authentication method list sent by the server, return the
2113: * next method we should try. If the server initially sends a nil list,
1.67 markus 2114: * use a built-in default list.
1.41 stevesk 2115: */
1.76 itojun 2116: static Authmethod *
1.20 markus 2117: authmethod_get(char *authlist)
2118: {
1.53 markus 2119: char *name = NULL;
1.97 markus 2120: u_int next;
1.41 stevesk 2121:
1.20 markus 2122: /* Use a suitable default if we're passed a nil list. */
2123: if (authlist == NULL || strlen(authlist) == 0)
1.53 markus 2124: authlist = options.preferred_authentications;
1.20 markus 2125:
1.53 markus 2126: if (supported == NULL || strcmp(authlist, supported) != 0) {
2127: debug3("start over, passed a different list %s", authlist);
1.197 djm 2128: free(supported);
1.53 markus 2129: supported = xstrdup(authlist);
2130: preferred = options.preferred_authentications;
2131: debug3("preferred %s", preferred);
2132: current = NULL;
2133: } else if (current != NULL && authmethod_is_enabled(current))
2134: return current;
1.20 markus 2135:
1.53 markus 2136: for (;;) {
2137: if ((name = match_list(preferred, supported, &next)) == NULL) {
1.109 markus 2138: debug("No more authentication methods to try.");
1.53 markus 2139: current = NULL;
2140: return NULL;
2141: }
2142: preferred += next;
1.23 markus 2143: debug3("authmethod_lookup %s", name);
1.53 markus 2144: debug3("remaining preferred: %s", preferred);
2145: if ((current = authmethod_lookup(name)) != NULL &&
2146: authmethod_is_enabled(current)) {
1.23 markus 2147: debug3("authmethod_is_enabled %s", name);
1.109 markus 2148: debug("Next authentication method: %s", name);
1.197 djm 2149: free(name);
1.53 markus 2150: return current;
1.23 markus 2151: }
1.198 dtucker 2152: free(name);
1.1 markus 2153: }
1.53 markus 2154: }
1.1 markus 2155:
1.79 stevesk 2156: static char *
1.53 markus 2157: authmethods_get(void)
2158: {
2159: Authmethod *method = NULL;
1.278 markus 2160: struct sshbuf *b;
1.93 markus 2161: char *list;
1.278 markus 2162: int r;
1.27 provos 2163:
1.278 markus 2164: if ((b = sshbuf_new()) == NULL)
2165: fatal("%s: sshbuf_new failed", __func__);
1.53 markus 2166: for (method = authmethods; method->name != NULL; method++) {
2167: if (authmethod_is_enabled(method)) {
1.278 markus 2168: if ((r = sshbuf_putf(b, "%s%s",
2169: sshbuf_len(b) ? "," : "", method->name)) != 0)
2170: fatal("%s: buffer error: %s",
2171: __func__, ssh_err(r));
1.53 markus 2172: }
2173: }
1.278 markus 2174: if ((list = sshbuf_dup_string(b)) == NULL)
1.242 djm 2175: fatal("%s: sshbuf_dup_string failed", __func__);
1.278 markus 2176: sshbuf_free(b);
1.93 markus 2177: return list;
1.1 markus 2178: }
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