| File: | src/usr.bin/ssh/ssh/../sshconnect2.c |
| Warning: | line 1487, column 7 Although the value stored to 'r' is used in the enclosing expression, the value is never actually read from 'r' |
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| 1 | /* $OpenBSD: sshconnect2.c,v 1.372 2024/01/08 00:34:34 djm Exp $ */ |
| 2 | /* |
| 3 | * Copyright (c) 2000 Markus Friedl. All rights reserved. |
| 4 | * Copyright (c) 2008 Damien Miller. All rights reserved. |
| 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 | |
| 27 | #include <sys/types.h> |
| 28 | #include <sys/socket.h> |
| 29 | #include <sys/wait.h> |
| 30 | #include <sys/queue.h> |
| 31 | #include <sys/stat.h> |
| 32 | |
| 33 | #include <errno(*__errno()).h> |
| 34 | #include <fcntl.h> |
| 35 | #include <limits.h> |
| 36 | #include <netdb.h> |
| 37 | #include <stdio.h> |
| 38 | #include <string.h> |
| 39 | #include <stdarg.h> |
| 40 | #include <signal.h> |
| 41 | #include <pwd.h> |
| 42 | #include <unistd.h> |
| 43 | #include <vis.h> |
| 44 | |
| 45 | #include "xmalloc.h" |
| 46 | #include "ssh.h" |
| 47 | #include "ssh2.h" |
| 48 | #include "sshbuf.h" |
| 49 | #include "packet.h" |
| 50 | #include "compat.h" |
| 51 | #include "cipher.h" |
| 52 | #include "sshkey.h" |
| 53 | #include "kex.h" |
| 54 | #include "sshconnect.h" |
| 55 | #include "authfile.h" |
| 56 | #include "dh.h" |
| 57 | #include "authfd.h" |
| 58 | #include "log.h" |
| 59 | #include "misc.h" |
| 60 | #include "readconf.h" |
| 61 | #include "match.h" |
| 62 | #include "dispatch.h" |
| 63 | #include "canohost.h" |
| 64 | #include "msg.h" |
| 65 | #include "pathnames.h" |
| 66 | #include "uidswap.h" |
| 67 | #include "hostfile.h" |
| 68 | #include "ssherr.h" |
| 69 | #include "utf8.h" |
| 70 | #include "ssh-sk.h" |
| 71 | #include "sk-api.h" |
| 72 | |
| 73 | #ifdef GSSAPI |
| 74 | #include "ssh-gss.h" |
| 75 | #endif |
| 76 | |
| 77 | /* import */ |
| 78 | extern char *client_version_string; |
| 79 | extern char *server_version_string; |
| 80 | extern Options options; |
| 81 | |
| 82 | /* |
| 83 | * SSH2 key exchange |
| 84 | */ |
| 85 | |
| 86 | static char *xxx_host; |
| 87 | static struct sockaddr *xxx_hostaddr; |
| 88 | static const struct ssh_conn_info *xxx_conn_info; |
| 89 | |
| 90 | static int |
| 91 | verify_host_key_callback(struct sshkey *hostkey, struct ssh *ssh) |
| 92 | { |
| 93 | int r; |
| 94 | |
| 95 | if ((r = sshkey_check_rsa_length(hostkey, |
| 96 | options.required_rsa_size)) != 0) |
| 97 | fatal_r(r, "Bad server host key")sshfatal("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__ , 97, 0, SYSLOG_LEVEL_FATAL, ssh_err(r), "Bad server host key" ); |
| 98 | if (verify_host_key(xxx_host, xxx_hostaddr, hostkey, |
| 99 | xxx_conn_info) == -1) |
| 100 | fatal("Host key verification failed.")sshfatal("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__ , 100, 0, SYSLOG_LEVEL_FATAL, ((void *)0), "Host key verification failed." ); |
| 101 | return 0; |
| 102 | } |
| 103 | |
| 104 | /* Returns the first item from a comma-separated algorithm list */ |
| 105 | static char * |
| 106 | first_alg(const char *algs) |
| 107 | { |
| 108 | char *ret, *cp; |
| 109 | |
| 110 | ret = xstrdup(algs); |
| 111 | if ((cp = strchr(ret, ',')) != NULL((void *)0)) |
| 112 | *cp = '\0'; |
| 113 | return ret; |
| 114 | } |
| 115 | |
| 116 | static char * |
| 117 | order_hostkeyalgs(char *host, struct sockaddr *hostaddr, u_short port, |
| 118 | const struct ssh_conn_info *cinfo) |
| 119 | { |
| 120 | char *oavail = NULL((void *)0), *avail = NULL((void *)0), *first = NULL((void *)0), *last = NULL((void *)0); |
| 121 | char *alg = NULL((void *)0), *hostname = NULL((void *)0), *ret = NULL((void *)0), *best = NULL((void *)0); |
| 122 | size_t maxlen; |
| 123 | struct hostkeys *hostkeys = NULL((void *)0); |
| 124 | int ktype; |
| 125 | u_int i; |
| 126 | |
| 127 | /* Find all hostkeys for this hostname */ |
| 128 | get_hostfile_hostname_ipaddr(host, hostaddr, port, &hostname, NULL((void *)0)); |
| 129 | hostkeys = init_hostkeys(); |
| 130 | for (i = 0; i < options.num_user_hostfiles; i++) |
| 131 | load_hostkeys(hostkeys, hostname, options.user_hostfiles[i], 0); |
| 132 | for (i = 0; i < options.num_system_hostfiles; i++) { |
| 133 | load_hostkeys(hostkeys, hostname, |
| 134 | options.system_hostfiles[i], 0); |
| 135 | } |
| 136 | if (options.known_hosts_command != NULL((void *)0)) { |
| 137 | load_hostkeys_command(hostkeys, options.known_hosts_command, |
| 138 | "ORDER", cinfo, NULL((void *)0), hostname); |
| 139 | } |
| 140 | /* |
| 141 | * If a plain public key exists that matches the type of the best |
| 142 | * preference HostkeyAlgorithms, then use the whole list as is. |
| 143 | * Note that we ignore whether the best preference algorithm is a |
| 144 | * certificate type, as sshconnect.c will downgrade certs to |
| 145 | * plain keys if necessary. |
| 146 | */ |
| 147 | best = first_alg(options.hostkeyalgorithms); |
| 148 | if (lookup_key_in_hostkeys_by_type(hostkeys, |
| 149 | sshkey_type_plain(sshkey_type_from_name(best)), |
| 150 | sshkey_ecdsa_nid_from_name(best), NULL((void *)0))) { |
| 151 | debug3_f("have matching best-preference key type %s, "sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__, 152, 1, SYSLOG_LEVEL_DEBUG3, ((void *)0), "have matching best-preference key type %s, " "using HostkeyAlgorithms verbatim", best) |
| 152 | "using HostkeyAlgorithms verbatim", best)sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__, 152, 1, SYSLOG_LEVEL_DEBUG3, ((void *)0), "have matching best-preference key type %s, " "using HostkeyAlgorithms verbatim", best); |
| 153 | ret = xstrdup(options.hostkeyalgorithms); |
| 154 | goto out; |
| 155 | } |
| 156 | |
| 157 | /* |
| 158 | * Otherwise, prefer the host key algorithms that match known keys |
| 159 | * while keeping the ordering of HostkeyAlgorithms as much as possible. |
| 160 | */ |
| 161 | oavail = avail = xstrdup(options.hostkeyalgorithms); |
| 162 | maxlen = strlen(avail) + 1; |
| 163 | first = xmalloc(maxlen); |
| 164 | last = xmalloc(maxlen); |
| 165 | *first = *last = '\0'; |
| 166 | |
| 167 | #define ALG_APPEND(to, from) \ |
| 168 | do { \ |
| 169 | if (*to != '\0') \ |
| 170 | strlcat(to, ",", maxlen); \ |
| 171 | strlcat(to, from, maxlen); \ |
| 172 | } while (0) |
| 173 | |
| 174 | while ((alg = strsep(&avail, ",")) && *alg != '\0') { |
| 175 | if ((ktype = sshkey_type_from_name(alg)) == KEY_UNSPEC) |
| 176 | fatal_f("unknown alg %s", alg)sshfatal("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__ , 176, 1, SYSLOG_LEVEL_FATAL, ((void *)0), "unknown alg %s", alg ); |
| 177 | /* |
| 178 | * If we have a @cert-authority marker in known_hosts then |
| 179 | * prefer all certificate algorithms. |
| 180 | */ |
| 181 | if (sshkey_type_is_cert(ktype) && |
| 182 | lookup_marker_in_hostkeys(hostkeys, MRK_CA)) { |
| 183 | ALG_APPEND(first, alg); |
| 184 | continue; |
| 185 | } |
| 186 | /* If the key appears in known_hosts then prefer it */ |
| 187 | if (lookup_key_in_hostkeys_by_type(hostkeys, |
| 188 | sshkey_type_plain(ktype), |
| 189 | sshkey_ecdsa_nid_from_name(alg), NULL((void *)0))) { |
| 190 | ALG_APPEND(first, alg); |
| 191 | continue; |
| 192 | } |
| 193 | /* Otherwise, put it last */ |
| 194 | ALG_APPEND(last, alg); |
| 195 | } |
| 196 | #undef ALG_APPEND |
| 197 | xasprintf(&ret, "%s%s%s", first, |
| 198 | (*first == '\0' || *last == '\0') ? "" : ",", last); |
| 199 | if (*first != '\0') |
| 200 | debug3_f("prefer hostkeyalgs: %s", first)sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__, 200, 1, SYSLOG_LEVEL_DEBUG3, ((void *)0), "prefer hostkeyalgs: %s" , first); |
| 201 | else |
| 202 | debug3_f("no algorithms matched; accept original")sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__, 202, 1, SYSLOG_LEVEL_DEBUG3, ((void *)0), "no algorithms matched; accept original" ); |
| 203 | out: |
| 204 | free(best); |
| 205 | free(first); |
| 206 | free(last); |
| 207 | free(hostname); |
| 208 | free(oavail); |
| 209 | free_hostkeys(hostkeys); |
| 210 | |
| 211 | return ret; |
| 212 | } |
| 213 | |
| 214 | void |
| 215 | ssh_kex2(struct ssh *ssh, char *host, struct sockaddr *hostaddr, u_short port, |
| 216 | const struct ssh_conn_info *cinfo) |
| 217 | { |
| 218 | char *myproposal[PROPOSAL_MAX]; |
| 219 | char *all_key, *hkalgs = NULL((void *)0); |
| 220 | int r, use_known_hosts_order = 0; |
| 221 | |
| 222 | xxx_host = host; |
| 223 | xxx_hostaddr = hostaddr; |
| 224 | xxx_conn_info = cinfo; |
| 225 | |
| 226 | if (options.rekey_limit || options.rekey_interval) |
| 227 | ssh_packet_set_rekey_limits(ssh, options.rekey_limit, |
| 228 | options.rekey_interval); |
| 229 | |
| 230 | /* |
| 231 | * If the user has not specified HostkeyAlgorithms, or has only |
| 232 | * appended or removed algorithms from that list then prefer algorithms |
| 233 | * that are in the list that are supported by known_hosts keys. |
| 234 | */ |
| 235 | if (options.hostkeyalgorithms == NULL((void *)0) || |
| 236 | options.hostkeyalgorithms[0] == '-' || |
| 237 | options.hostkeyalgorithms[0] == '+') |
| 238 | use_known_hosts_order = 1; |
| 239 | |
| 240 | /* Expand or fill in HostkeyAlgorithms */ |
| 241 | all_key = sshkey_alg_list(0, 0, 1, ','); |
| 242 | if ((r = kex_assemble_names(&options.hostkeyalgorithms, |
| 243 | kex_default_pk_alg(), all_key)) != 0) |
| 244 | fatal_fr(r, "kex_assemble_namelist")sshfatal("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__ , 244, 1, SYSLOG_LEVEL_FATAL, ssh_err(r), "kex_assemble_namelist" ); |
| 245 | free(all_key); |
| 246 | |
| 247 | if (use_known_hosts_order) |
| 248 | hkalgs = order_hostkeyalgs(host, hostaddr, port, cinfo); |
| 249 | |
| 250 | kex_proposal_populate_entries(ssh, myproposal, |
| 251 | options.kex_algorithms, options.ciphers, options.macs, |
| 252 | compression_alg_list(options.compression), |
| 253 | hkalgs ? hkalgs : options.hostkeyalgorithms); |
| 254 | |
| 255 | free(hkalgs); |
| 256 | |
| 257 | /* start key exchange */ |
| 258 | if ((r = kex_setup(ssh, myproposal)) != 0) |
| 259 | fatal_r(r, "kex_setup")sshfatal("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__ , 259, 0, SYSLOG_LEVEL_FATAL, ssh_err(r), "kex_setup"); |
| 260 | #ifdef WITH_OPENSSL1 |
| 261 | ssh->kex->kex[KEX_DH_GRP1_SHA1] = kex_gen_client; |
| 262 | ssh->kex->kex[KEX_DH_GRP14_SHA1] = kex_gen_client; |
| 263 | ssh->kex->kex[KEX_DH_GRP14_SHA256] = kex_gen_client; |
| 264 | ssh->kex->kex[KEX_DH_GRP16_SHA512] = kex_gen_client; |
| 265 | ssh->kex->kex[KEX_DH_GRP18_SHA512] = kex_gen_client; |
| 266 | ssh->kex->kex[KEX_DH_GEX_SHA1] = kexgex_client; |
| 267 | ssh->kex->kex[KEX_DH_GEX_SHA256] = kexgex_client; |
| 268 | ssh->kex->kex[KEX_ECDH_SHA2] = kex_gen_client; |
| 269 | #endif |
| 270 | ssh->kex->kex[KEX_C25519_SHA256] = kex_gen_client; |
| 271 | ssh->kex->kex[KEX_KEM_SNTRUP761X25519_SHA512] = kex_gen_client; |
| 272 | ssh->kex->verify_host_key=&verify_host_key_callback; |
| 273 | |
| 274 | ssh_dispatch_run_fatal(ssh, DISPATCH_BLOCK, &ssh->kex->done); |
| 275 | kex_proposal_free_entries(myproposal); |
| 276 | |
| 277 | #ifdef DEBUG_KEXDH |
| 278 | /* send 1st encrypted/maced/compressed message */ |
| 279 | if ((r = sshpkt_start(ssh, SSH2_MSG_IGNORE2)) != 0 || |
| 280 | (r = sshpkt_put_cstring(ssh, "markus")) != 0 || |
| 281 | (r = sshpkt_send(ssh)) != 0 || |
| 282 | (r = ssh_packet_write_wait(ssh)) != 0) |
| 283 | fatal_fr(r, "send packet")sshfatal("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__ , 283, 1, SYSLOG_LEVEL_FATAL, ssh_err(r), "send packet"); |
| 284 | #endif |
| 285 | } |
| 286 | |
| 287 | /* |
| 288 | * Authenticate user |
| 289 | */ |
| 290 | |
| 291 | typedef struct cauthctxt Authctxt; |
| 292 | typedef struct cauthmethod Authmethod; |
| 293 | typedef struct identity Identity; |
| 294 | typedef struct idlist Idlist; |
| 295 | |
| 296 | struct identity { |
| 297 | TAILQ_ENTRY(identity)struct { struct identity *tqe_next; struct identity **tqe_prev ; } next; |
| 298 | int agent_fd; /* >=0 if agent supports key */ |
| 299 | struct sshkey *key; /* public/private key */ |
| 300 | char *filename; /* comment for agent-only keys */ |
| 301 | int tried; |
| 302 | int isprivate; /* key points to the private key */ |
| 303 | int userprovided; |
| 304 | }; |
| 305 | TAILQ_HEAD(idlist, identity)struct idlist { struct identity *tqh_first; struct identity * *tqh_last; }; |
| 306 | |
| 307 | struct cauthctxt { |
| 308 | const char *server_user; |
| 309 | const char *local_user; |
| 310 | const char *host; |
| 311 | const char *service; |
| 312 | struct cauthmethod *method; |
| 313 | sig_atomic_t success; |
| 314 | char *authlist; |
| 315 | #ifdef GSSAPI |
| 316 | /* gssapi */ |
| 317 | gss_OID_set gss_supported_mechs; |
| 318 | u_int mech_tried; |
| 319 | #endif |
| 320 | /* pubkey */ |
| 321 | struct idlist keys; |
| 322 | int agent_fd; |
| 323 | /* hostbased */ |
| 324 | Sensitive *sensitive; |
| 325 | char *oktypes, *ktypes; |
| 326 | const char *active_ktype; |
| 327 | /* kbd-interactive */ |
| 328 | int info_req_seen; |
| 329 | int attempt_kbdint; |
| 330 | /* password */ |
| 331 | int attempt_passwd; |
| 332 | /* generic */ |
| 333 | void *methoddata; |
| 334 | }; |
| 335 | |
| 336 | struct cauthmethod { |
| 337 | char *name; /* string to compare against server's list */ |
| 338 | int (*userauth)(struct ssh *ssh); |
| 339 | void (*cleanup)(struct ssh *ssh); |
| 340 | int *enabled; /* flag in option struct that enables method */ |
| 341 | int *batch_flag; /* flag in option struct that disables method */ |
| 342 | }; |
| 343 | |
| 344 | static int input_userauth_service_accept(int, u_int32_t, struct ssh *); |
| 345 | static int input_userauth_success(int, u_int32_t, struct ssh *); |
| 346 | static int input_userauth_failure(int, u_int32_t, struct ssh *); |
| 347 | static int input_userauth_banner(int, u_int32_t, struct ssh *); |
| 348 | static int input_userauth_error(int, u_int32_t, struct ssh *); |
| 349 | static int input_userauth_info_req(int, u_int32_t, struct ssh *); |
| 350 | static int input_userauth_pk_ok(int, u_int32_t, struct ssh *); |
| 351 | static int input_userauth_passwd_changereq(int, u_int32_t, struct ssh *); |
| 352 | |
| 353 | static int userauth_none(struct ssh *); |
| 354 | static int userauth_pubkey(struct ssh *); |
| 355 | static int userauth_passwd(struct ssh *); |
| 356 | static int userauth_kbdint(struct ssh *); |
| 357 | static int userauth_hostbased(struct ssh *); |
| 358 | |
| 359 | #ifdef GSSAPI |
| 360 | static int userauth_gssapi(struct ssh *); |
| 361 | static void userauth_gssapi_cleanup(struct ssh *); |
| 362 | static int input_gssapi_response(int type, u_int32_t, struct ssh *); |
| 363 | static int input_gssapi_token(int type, u_int32_t, struct ssh *); |
| 364 | static int input_gssapi_error(int, u_int32_t, struct ssh *); |
| 365 | static int input_gssapi_errtok(int, u_int32_t, struct ssh *); |
| 366 | #endif |
| 367 | |
| 368 | void userauth(struct ssh *, char *); |
| 369 | |
| 370 | static void pubkey_cleanup(struct ssh *); |
| 371 | static int sign_and_send_pubkey(struct ssh *ssh, Identity *); |
| 372 | static void pubkey_prepare(struct ssh *, Authctxt *); |
| 373 | static void pubkey_reset(Authctxt *); |
| 374 | static struct sshkey *load_identity_file(Identity *); |
| 375 | |
| 376 | static Authmethod *authmethod_get(char *authlist); |
| 377 | static Authmethod *authmethod_lookup(const char *name); |
| 378 | static char *authmethods_get(void); |
| 379 | |
| 380 | Authmethod authmethods[] = { |
| 381 | #ifdef GSSAPI |
| 382 | {"gssapi-with-mic", |
| 383 | userauth_gssapi, |
| 384 | userauth_gssapi_cleanup, |
| 385 | &options.gss_authentication, |
| 386 | NULL((void *)0)}, |
| 387 | #endif |
| 388 | {"hostbased", |
| 389 | userauth_hostbased, |
| 390 | NULL((void *)0), |
| 391 | &options.hostbased_authentication, |
| 392 | NULL((void *)0)}, |
| 393 | {"publickey", |
| 394 | userauth_pubkey, |
| 395 | NULL((void *)0), |
| 396 | &options.pubkey_authentication, |
| 397 | NULL((void *)0)}, |
| 398 | {"keyboard-interactive", |
| 399 | userauth_kbdint, |
| 400 | NULL((void *)0), |
| 401 | &options.kbd_interactive_authentication, |
| 402 | &options.batch_mode}, |
| 403 | {"password", |
| 404 | userauth_passwd, |
| 405 | NULL((void *)0), |
| 406 | &options.password_authentication, |
| 407 | &options.batch_mode}, |
| 408 | {"none", |
| 409 | userauth_none, |
| 410 | NULL((void *)0), |
| 411 | NULL((void *)0), |
| 412 | NULL((void *)0)}, |
| 413 | {NULL((void *)0), NULL((void *)0), NULL((void *)0), NULL((void *)0), NULL((void *)0)} |
| 414 | }; |
| 415 | |
| 416 | void |
| 417 | ssh_userauth2(struct ssh *ssh, const char *local_user, |
| 418 | const char *server_user, char *host, Sensitive *sensitive) |
| 419 | { |
| 420 | Authctxt authctxt; |
| 421 | int r; |
| 422 | |
| 423 | if (options.preferred_authentications == NULL((void *)0)) |
| 424 | options.preferred_authentications = authmethods_get(); |
| 425 | |
| 426 | /* setup authentication context */ |
| 427 | memset(&authctxt, 0, sizeof(authctxt)); |
| 428 | authctxt.server_user = server_user; |
| 429 | authctxt.local_user = local_user; |
| 430 | authctxt.host = host; |
| 431 | authctxt.service = "ssh-connection"; /* service name */ |
| 432 | authctxt.success = 0; |
| 433 | authctxt.method = authmethod_lookup("none"); |
| 434 | authctxt.authlist = NULL((void *)0); |
| 435 | authctxt.methoddata = NULL((void *)0); |
| 436 | authctxt.sensitive = sensitive; |
| 437 | authctxt.active_ktype = authctxt.oktypes = authctxt.ktypes = NULL((void *)0); |
| 438 | authctxt.info_req_seen = 0; |
| 439 | authctxt.attempt_kbdint = 0; |
| 440 | authctxt.attempt_passwd = 0; |
| 441 | #if GSSAPI |
| 442 | authctxt.gss_supported_mechs = NULL((void *)0); |
| 443 | authctxt.mech_tried = 0; |
| 444 | #endif |
| 445 | authctxt.agent_fd = -1; |
| 446 | if (authctxt.method == NULL((void *)0)) |
| 447 | fatal_f("internal error: cannot send userauth none request")sshfatal("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__ , 447, 1, SYSLOG_LEVEL_FATAL, ((void *)0), "internal error: cannot send userauth none request" ); |
| 448 | |
| 449 | if ((r = sshpkt_start(ssh, SSH2_MSG_SERVICE_REQUEST5)) != 0 || |
| 450 | (r = sshpkt_put_cstring(ssh, "ssh-userauth")) != 0 || |
| 451 | (r = sshpkt_send(ssh)) != 0) |
| 452 | fatal_fr(r, "send packet")sshfatal("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__ , 452, 1, SYSLOG_LEVEL_FATAL, ssh_err(r), "send packet"); |
| 453 | |
| 454 | ssh->authctxt = &authctxt; |
| 455 | ssh_dispatch_init(ssh, &input_userauth_error); |
| 456 | ssh_dispatch_set(ssh, SSH2_MSG_EXT_INFO7, kex_input_ext_info); |
| 457 | ssh_dispatch_set(ssh, SSH2_MSG_SERVICE_ACCEPT6, &input_userauth_service_accept); |
| 458 | ssh_dispatch_run_fatal(ssh, DISPATCH_BLOCK, &authctxt.success); /* loop until success */ |
| 459 | pubkey_cleanup(ssh); |
| 460 | #ifdef GSSAPI |
| 461 | if (authctxt.gss_supported_mechs != NULL((void *)0)) { |
| 462 | u_int ms; |
| 463 | |
| 464 | gss_release_oid_set(&ms, &authctxt.gss_supported_mechs); |
| 465 | authctxt.gss_supported_mechs = NULL((void *)0); |
| 466 | } |
| 467 | #endif |
| 468 | ssh->authctxt = NULL((void *)0); |
| 469 | |
| 470 | ssh_dispatch_range(ssh, SSH2_MSG_USERAUTH_MIN50, SSH2_MSG_USERAUTH_MAX79, NULL((void *)0)); |
| 471 | |
| 472 | if (!authctxt.success) |
| 473 | fatal("Authentication failed.")sshfatal("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__ , 473, 0, SYSLOG_LEVEL_FATAL, ((void *)0), "Authentication failed." ); |
| 474 | if (ssh_packet_connection_is_on_socket(ssh)) { |
| 475 | verbose("Authenticated to %s ([%s]:%d) using \"%s\".", host,sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__, 477, 0, SYSLOG_LEVEL_VERBOSE, ((void *)0), "Authenticated to %s ([%s]:%d) using \"%s\"." , host, ssh_remote_ipaddr(ssh), ssh_remote_port(ssh), authctxt .method->name) |
| 476 | ssh_remote_ipaddr(ssh), ssh_remote_port(ssh),sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__, 477, 0, SYSLOG_LEVEL_VERBOSE, ((void *)0), "Authenticated to %s ([%s]:%d) using \"%s\"." , host, ssh_remote_ipaddr(ssh), ssh_remote_port(ssh), authctxt .method->name) |
| 477 | authctxt.method->name)sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__, 477, 0, SYSLOG_LEVEL_VERBOSE, ((void *)0), "Authenticated to %s ([%s]:%d) using \"%s\"." , host, ssh_remote_ipaddr(ssh), ssh_remote_port(ssh), authctxt .method->name); |
| 478 | } else { |
| 479 | verbose("Authenticated to %s (via proxy) using \"%s\".", host,sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__, 480, 0, SYSLOG_LEVEL_VERBOSE, ((void *)0), "Authenticated to %s (via proxy) using \"%s\"." , host, authctxt.method->name) |
| 480 | authctxt.method->name)sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__, 480, 0, SYSLOG_LEVEL_VERBOSE, ((void *)0), "Authenticated to %s (via proxy) using \"%s\"." , host, authctxt.method->name); |
| 481 | } |
| 482 | } |
| 483 | |
| 484 | static int |
| 485 | input_userauth_service_accept(int type, u_int32_t seq, struct ssh *ssh) |
| 486 | { |
| 487 | int r; |
| 488 | |
| 489 | if (ssh_packet_remaining(ssh) > 0) { |
| 490 | char *reply; |
| 491 | |
| 492 | if ((r = sshpkt_get_cstring(ssh, &reply, NULL((void *)0))) != 0) |
| 493 | goto out; |
| 494 | debug2("service_accept: %s", reply)sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__, 494, 0, SYSLOG_LEVEL_DEBUG2, ((void *)0), "service_accept: %s" , reply); |
| 495 | free(reply); |
| 496 | } else { |
| 497 | debug2("buggy server: service_accept w/o service")sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__, 497, 0, SYSLOG_LEVEL_DEBUG2, ((void *)0), "buggy server: service_accept w/o service" ); |
| 498 | } |
| 499 | if ((r = sshpkt_get_end(ssh)) != 0) |
| 500 | goto out; |
| 501 | debug("SSH2_MSG_SERVICE_ACCEPT received")sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__, 501, 0, SYSLOG_LEVEL_DEBUG1, ((void *)0), "SSH2_MSG_SERVICE_ACCEPT received" ); |
| 502 | |
| 503 | /* initial userauth request */ |
| 504 | userauth_none(ssh); |
| 505 | |
| 506 | /* accept EXT_INFO at any time during userauth */ |
| 507 | ssh_dispatch_set(ssh, SSH2_MSG_EXT_INFO7, ssh->kex->ext_info_s ? |
| 508 | &kex_input_ext_info : &input_userauth_error); |
| 509 | ssh_dispatch_set(ssh, SSH2_MSG_USERAUTH_SUCCESS52, &input_userauth_success); |
| 510 | ssh_dispatch_set(ssh, SSH2_MSG_USERAUTH_FAILURE51, &input_userauth_failure); |
| 511 | ssh_dispatch_set(ssh, SSH2_MSG_USERAUTH_BANNER53, &input_userauth_banner); |
| 512 | r = 0; |
| 513 | out: |
| 514 | return r; |
| 515 | } |
| 516 | |
| 517 | void |
| 518 | userauth(struct ssh *ssh, char *authlist) |
| 519 | { |
| 520 | Authctxt *authctxt = (Authctxt *)ssh->authctxt; |
| 521 | |
| 522 | if (authctxt->method != NULL((void *)0) && authctxt->method->cleanup != NULL((void *)0)) |
| 523 | authctxt->method->cleanup(ssh); |
| 524 | |
| 525 | free(authctxt->methoddata); |
| 526 | authctxt->methoddata = NULL((void *)0); |
| 527 | if (authlist == NULL((void *)0)) { |
| 528 | authlist = authctxt->authlist; |
| 529 | } else { |
| 530 | free(authctxt->authlist); |
| 531 | authctxt->authlist = authlist; |
| 532 | } |
| 533 | for (;;) { |
| 534 | Authmethod *method = authmethod_get(authlist); |
| 535 | if (method == NULL((void *)0)) |
| 536 | fatal("%s@%s: Permission denied (%s).",sshfatal("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__ , 537, 0, SYSLOG_LEVEL_FATAL, ((void *)0), "%s@%s: Permission denied (%s)." , authctxt->server_user, authctxt->host, authlist) |
| 537 | authctxt->server_user, authctxt->host, authlist)sshfatal("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__ , 537, 0, SYSLOG_LEVEL_FATAL, ((void *)0), "%s@%s: Permission denied (%s)." , authctxt->server_user, authctxt->host, authlist); |
| 538 | authctxt->method = method; |
| 539 | |
| 540 | /* reset the per method handler */ |
| 541 | ssh_dispatch_range(ssh, SSH2_MSG_USERAUTH_PER_METHOD_MIN60, |
| 542 | SSH2_MSG_USERAUTH_PER_METHOD_MAX79, NULL((void *)0)); |
| 543 | |
| 544 | /* and try new method */ |
| 545 | if (method->userauth(ssh) != 0) { |
| 546 | debug2("we sent a %s packet, wait for reply", method->name)sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__, 546, 0, SYSLOG_LEVEL_DEBUG2, ((void *)0), "we sent a %s packet, wait for reply" , method->name); |
| 547 | break; |
| 548 | } else { |
| 549 | debug2("we did not send a packet, disable method")sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__, 549, 0, SYSLOG_LEVEL_DEBUG2, ((void *)0), "we did not send a packet, disable method" ); |
| 550 | method->enabled = NULL((void *)0); |
| 551 | } |
| 552 | } |
| 553 | } |
| 554 | |
| 555 | static int |
| 556 | input_userauth_error(int type, u_int32_t seq, struct ssh *ssh) |
| 557 | { |
| 558 | fatal_f("bad message during authentication: type %d", type)sshfatal("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__ , 558, 1, SYSLOG_LEVEL_FATAL, ((void *)0), "bad message during authentication: type %d" , type); |
| 559 | return 0; |
| 560 | } |
| 561 | |
| 562 | static int |
| 563 | input_userauth_banner(int type, u_int32_t seq, struct ssh *ssh) |
| 564 | { |
| 565 | char *msg = NULL((void *)0); |
| 566 | size_t len; |
| 567 | int r; |
| 568 | |
| 569 | debug3_f("entering")sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__, 569, 1, SYSLOG_LEVEL_DEBUG3, ((void *)0), "entering"); |
| 570 | if ((r = sshpkt_get_cstring(ssh, &msg, &len)) != 0 || |
| 571 | (r = sshpkt_get_cstring(ssh, NULL((void *)0), NULL((void *)0))) != 0) |
| 572 | goto out; |
| 573 | if (len > 0 && options.log_level >= SYSLOG_LEVEL_INFO) |
| 574 | fmprintf(stderr(&__sF[2]), "%s", msg); |
| 575 | r = 0; |
| 576 | out: |
| 577 | free(msg); |
| 578 | return r; |
| 579 | } |
| 580 | |
| 581 | static int |
| 582 | input_userauth_success(int type, u_int32_t seq, struct ssh *ssh) |
| 583 | { |
| 584 | Authctxt *authctxt = ssh->authctxt; |
| 585 | |
| 586 | if (authctxt == NULL((void *)0)) |
| 587 | fatal_f("no authentication context")sshfatal("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__ , 587, 1, SYSLOG_LEVEL_FATAL, ((void *)0), "no authentication context" ); |
| 588 | free(authctxt->authlist); |
| 589 | authctxt->authlist = NULL((void *)0); |
| 590 | if (authctxt->method != NULL((void *)0) && authctxt->method->cleanup != NULL((void *)0)) |
| 591 | authctxt->method->cleanup(ssh); |
| 592 | free(authctxt->methoddata); |
| 593 | authctxt->methoddata = NULL((void *)0); |
| 594 | authctxt->success = 1; /* break out */ |
| 595 | ssh_dispatch_set(ssh, SSH2_MSG_EXT_INFO7, dispatch_protocol_error); |
| 596 | return 0; |
| 597 | } |
| 598 | |
| 599 | #if 0 |
| 600 | static int |
| 601 | input_userauth_success_unexpected(int type, u_int32_t seq, struct ssh *ssh) |
| 602 | { |
| 603 | Authctxt *authctxt = ssh->authctxt; |
| 604 | |
| 605 | if (authctxt == NULL((void *)0)) |
| 606 | fatal_f("no authentication context")sshfatal("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__ , 606, 1, SYSLOG_LEVEL_FATAL, ((void *)0), "no authentication context" ); |
| 607 | |
| 608 | fatal("Unexpected authentication success during %s.",sshfatal("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__ , 609, 0, SYSLOG_LEVEL_FATAL, ((void *)0), "Unexpected authentication success during %s." , authctxt->method->name) |
| 609 | authctxt->method->name)sshfatal("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__ , 609, 0, SYSLOG_LEVEL_FATAL, ((void *)0), "Unexpected authentication success during %s." , authctxt->method->name); |
| 610 | return 0; |
| 611 | } |
| 612 | #endif |
| 613 | |
| 614 | static int |
| 615 | input_userauth_failure(int type, u_int32_t seq, struct ssh *ssh) |
| 616 | { |
| 617 | Authctxt *authctxt = ssh->authctxt; |
| 618 | char *authlist = NULL((void *)0); |
| 619 | u_char partial; |
| 620 | |
| 621 | if (authctxt == NULL((void *)0)) |
| 622 | fatal("input_userauth_failure: no authentication context")sshfatal("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__ , 622, 0, SYSLOG_LEVEL_FATAL, ((void *)0), "input_userauth_failure: no authentication context" ); |
| 623 | |
| 624 | if (sshpkt_get_cstring(ssh, &authlist, NULL((void *)0)) != 0 || |
| 625 | sshpkt_get_u8(ssh, &partial) != 0 || |
| 626 | sshpkt_get_end(ssh) != 0) |
| 627 | goto out; |
| 628 | |
| 629 | if (partial != 0) { |
| 630 | verbose("Authenticated using \"%s\" with partial success.",sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__, 631, 0, SYSLOG_LEVEL_VERBOSE, ((void *)0), "Authenticated using \"%s\" with partial success." , authctxt->method->name) |
| 631 | authctxt->method->name)sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__, 631, 0, SYSLOG_LEVEL_VERBOSE, ((void *)0), "Authenticated using \"%s\" with partial success." , authctxt->method->name); |
| 632 | /* reset state */ |
| 633 | pubkey_reset(authctxt); |
| 634 | } |
| 635 | debug("Authentications that can continue: %s", authlist)sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__, 635, 0, SYSLOG_LEVEL_DEBUG1, ((void *)0), "Authentications that can continue: %s" , authlist); |
| 636 | |
| 637 | userauth(ssh, authlist); |
| 638 | authlist = NULL((void *)0); |
| 639 | out: |
| 640 | free(authlist); |
| 641 | return 0; |
| 642 | } |
| 643 | |
| 644 | /* |
| 645 | * Format an identity for logging including filename, key type, fingerprint |
| 646 | * and location (agent, etc.). Caller must free. |
| 647 | */ |
| 648 | static char * |
| 649 | format_identity(Identity *id) |
| 650 | { |
| 651 | char *fp = NULL((void *)0), *ret = NULL((void *)0); |
| 652 | const char *note = ""; |
| 653 | |
| 654 | if (id->key != NULL((void *)0)) { |
| 655 | fp = sshkey_fingerprint(id->key, options.fingerprint_hash, |
| 656 | SSH_FP_DEFAULT); |
| 657 | } |
| 658 | if (id->key) { |
| 659 | if ((id->key->flags & SSHKEY_FLAG_EXT0x0001) != 0) |
| 660 | note = " token"; |
| 661 | else if (sshkey_is_sk(id->key)) |
| 662 | note = " authenticator"; |
| 663 | } |
| 664 | xasprintf(&ret, "%s %s%s%s%s%s%s", |
| 665 | id->filename, |
| 666 | id->key ? sshkey_type(id->key) : "", id->key ? " " : "", |
| 667 | fp ? fp : "", |
| 668 | id->userprovided ? " explicit" : "", note, |
| 669 | id->agent_fd != -1 ? " agent" : ""); |
| 670 | free(fp); |
| 671 | return ret; |
| 672 | } |
| 673 | |
| 674 | static int |
| 675 | input_userauth_pk_ok(int type, u_int32_t seq, struct ssh *ssh) |
| 676 | { |
| 677 | Authctxt *authctxt = ssh->authctxt; |
| 678 | struct sshkey *key = NULL((void *)0); |
| 679 | Identity *id = NULL((void *)0); |
| 680 | int pktype, found = 0, sent = 0; |
| 681 | size_t blen; |
| 682 | char *pkalg = NULL((void *)0), *fp = NULL((void *)0), *ident = NULL((void *)0); |
| 683 | u_char *pkblob = NULL((void *)0); |
| 684 | int r; |
| 685 | |
| 686 | if (authctxt == NULL((void *)0)) |
| 687 | fatal("input_userauth_pk_ok: no authentication context")sshfatal("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__ , 687, 0, SYSLOG_LEVEL_FATAL, ((void *)0), "input_userauth_pk_ok: no authentication context" ); |
| 688 | |
| 689 | if ((r = sshpkt_get_cstring(ssh, &pkalg, NULL((void *)0))) != 0 || |
| 690 | (r = sshpkt_get_string(ssh, &pkblob, &blen)) != 0 || |
| 691 | (r = sshpkt_get_end(ssh)) != 0) |
| 692 | goto done; |
| 693 | |
| 694 | if ((pktype = sshkey_type_from_name(pkalg)) == KEY_UNSPEC) { |
| 695 | debug_f("server sent unknown pkalg %s", pkalg)sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__, 695, 1, SYSLOG_LEVEL_DEBUG1, ((void *)0), "server sent unknown pkalg %s" , pkalg); |
| 696 | goto done; |
| 697 | } |
| 698 | if ((r = sshkey_from_blob(pkblob, blen, &key)) != 0) { |
| 699 | debug_r(r, "no key from blob. pkalg %s", pkalg)sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__, 699, 0, SYSLOG_LEVEL_DEBUG1, ssh_err(r), "no key from blob. pkalg %s" , pkalg); |
| 700 | goto done; |
| 701 | } |
| 702 | if (key->type != pktype) { |
| 703 | error("input_userauth_pk_ok: type mismatch "sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__, 705, 0, SYSLOG_LEVEL_ERROR, ((void *)0), "input_userauth_pk_ok: type mismatch " "for decoded key (received %d, expected %d)", key->type, pktype ) |
| 704 | "for decoded key (received %d, expected %d)",sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__, 705, 0, SYSLOG_LEVEL_ERROR, ((void *)0), "input_userauth_pk_ok: type mismatch " "for decoded key (received %d, expected %d)", key->type, pktype ) |
| 705 | key->type, pktype)sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__, 705, 0, SYSLOG_LEVEL_ERROR, ((void *)0), "input_userauth_pk_ok: type mismatch " "for decoded key (received %d, expected %d)", key->type, pktype ); |
| 706 | goto done; |
| 707 | } |
| 708 | |
| 709 | /* |
| 710 | * search keys in the reverse order, because last candidate has been |
| 711 | * moved to the end of the queue. this also avoids confusion by |
| 712 | * duplicate keys |
| 713 | */ |
| 714 | TAILQ_FOREACH_REVERSE(id, &authctxt->keys, idlist, next)for((id) = (*(((struct idlist *)((&authctxt->keys)-> tqh_last))->tqh_last)); (id) != ((void *)0); (id) = (*(((struct idlist *)((id)->next.tqe_prev))->tqh_last))) { |
| 715 | if (sshkey_equal(key, id->key)) { |
| 716 | found = 1; |
| 717 | break; |
| 718 | } |
| 719 | } |
| 720 | if (!found || id == NULL((void *)0)) { |
| 721 | fp = sshkey_fingerprint(key, options.fingerprint_hash, |
| 722 | SSH_FP_DEFAULT); |
| 723 | error_f("server replied with unknown key: %s %s",sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__, 724, 1, SYSLOG_LEVEL_ERROR, ((void *)0), "server replied with unknown key: %s %s" , sshkey_type(key), fp == ((void *)0) ? "<ERROR>" : fp) |
| 724 | sshkey_type(key), fp == NULL ? "<ERROR>" : fp)sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__, 724, 1, SYSLOG_LEVEL_ERROR, ((void *)0), "server replied with unknown key: %s %s" , sshkey_type(key), fp == ((void *)0) ? "<ERROR>" : fp); |
| 725 | goto done; |
| 726 | } |
| 727 | ident = format_identity(id); |
| 728 | debug("Server accepts key: %s", ident)sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__, 728, 0, SYSLOG_LEVEL_DEBUG1, ((void *)0), "Server accepts key: %s" , ident); |
| 729 | sent = sign_and_send_pubkey(ssh, id); |
| 730 | r = 0; |
| 731 | done: |
| 732 | sshkey_free(key); |
| 733 | free(ident); |
| 734 | free(fp); |
| 735 | free(pkalg); |
| 736 | free(pkblob); |
| 737 | |
| 738 | /* try another method if we did not send a packet */ |
| 739 | if (r == 0 && sent == 0) |
| 740 | userauth(ssh, NULL((void *)0)); |
| 741 | return r; |
| 742 | } |
| 743 | |
| 744 | #ifdef GSSAPI |
| 745 | static int |
| 746 | userauth_gssapi(struct ssh *ssh) |
| 747 | { |
| 748 | Authctxt *authctxt = (Authctxt *)ssh->authctxt; |
| 749 | Gssctxt *gssctxt = NULL((void *)0); |
| 750 | OM_uint32 min; |
| 751 | int r, ok = 0; |
| 752 | gss_OID mech = NULL((void *)0); |
| 753 | |
| 754 | /* Try one GSSAPI method at a time, rather than sending them all at |
| 755 | * once. */ |
| 756 | |
| 757 | if (authctxt->gss_supported_mechs == NULL((void *)0)) |
| 758 | gss_indicate_mechs(&min, &authctxt->gss_supported_mechs); |
| 759 | |
| 760 | /* Check to see whether the mechanism is usable before we offer it */ |
| 761 | while (authctxt->mech_tried < authctxt->gss_supported_mechs->count && |
| 762 | !ok) { |
| 763 | mech = &authctxt->gss_supported_mechs-> |
| 764 | elements[authctxt->mech_tried]; |
| 765 | /* My DER encoding requires length<128 */ |
| 766 | if (mech->length < 128 && ssh_gssapi_check_mechanism(&gssctxt, |
| 767 | mech, authctxt->host)) { |
| 768 | ok = 1; /* Mechanism works */ |
| 769 | } else { |
| 770 | authctxt->mech_tried++; |
| 771 | } |
| 772 | } |
| 773 | |
| 774 | if (!ok || mech == NULL((void *)0)) |
| 775 | return 0; |
| 776 | |
| 777 | authctxt->methoddata=(void *)gssctxt; |
| 778 | |
| 779 | if ((r = sshpkt_start(ssh, SSH2_MSG_USERAUTH_REQUEST50)) != 0 || |
| 780 | (r = sshpkt_put_cstring(ssh, authctxt->server_user)) != 0 || |
| 781 | (r = sshpkt_put_cstring(ssh, authctxt->service)) != 0 || |
| 782 | (r = sshpkt_put_cstring(ssh, authctxt->method->name)) != 0 || |
| 783 | (r = sshpkt_put_u32(ssh, 1)) != 0 || |
| 784 | (r = sshpkt_put_u32(ssh, (mech->length) + 2)) != 0 || |
| 785 | (r = sshpkt_put_u8(ssh, SSH_GSS_OIDTYPE)) != 0 || |
| 786 | (r = sshpkt_put_u8(ssh, mech->length)) != 0 || |
| 787 | (r = sshpkt_put(ssh, mech->elements, mech->length)) != 0 || |
| 788 | (r = sshpkt_send(ssh)) != 0) |
| 789 | fatal_fr(r, "send packet")sshfatal("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__ , 789, 1, SYSLOG_LEVEL_FATAL, ssh_err(r), "send packet"); |
| 790 | |
| 791 | ssh_dispatch_set(ssh, SSH2_MSG_USERAUTH_GSSAPI_RESPONSE, &input_gssapi_response); |
| 792 | ssh_dispatch_set(ssh, SSH2_MSG_USERAUTH_GSSAPI_TOKEN, &input_gssapi_token); |
| 793 | ssh_dispatch_set(ssh, SSH2_MSG_USERAUTH_GSSAPI_ERROR, &input_gssapi_error); |
| 794 | ssh_dispatch_set(ssh, SSH2_MSG_USERAUTH_GSSAPI_ERRTOK, &input_gssapi_errtok); |
| 795 | |
| 796 | authctxt->mech_tried++; /* Move along to next candidate */ |
| 797 | |
| 798 | return 1; |
| 799 | } |
| 800 | |
| 801 | static void |
| 802 | userauth_gssapi_cleanup(struct ssh *ssh) |
| 803 | { |
| 804 | Authctxt *authctxt = (Authctxt *)ssh->authctxt; |
| 805 | Gssctxt *gssctxt = (Gssctxt *)authctxt->methoddata; |
| 806 | |
| 807 | ssh_gssapi_delete_ctx(&gssctxt); |
| 808 | authctxt->methoddata = NULL((void *)0); |
| 809 | } |
| 810 | |
| 811 | static OM_uint32 |
| 812 | process_gssapi_token(struct ssh *ssh, gss_buffer_t recv_tok) |
| 813 | { |
| 814 | Authctxt *authctxt = ssh->authctxt; |
| 815 | Gssctxt *gssctxt = authctxt->methoddata; |
| 816 | gss_buffer_desc send_tok = GSS_C_EMPTY_BUFFER; |
| 817 | gss_buffer_desc mic = GSS_C_EMPTY_BUFFER; |
| 818 | gss_buffer_desc gssbuf; |
| 819 | OM_uint32 status, ms, flags; |
| 820 | int r; |
| 821 | |
| 822 | status = ssh_gssapi_init_ctx(gssctxt, options.gss_deleg_creds, |
| 823 | recv_tok, &send_tok, &flags); |
| 824 | |
| 825 | if (send_tok.length > 0) { |
| 826 | u_char type = GSS_ERROR(status) ? |
| 827 | SSH2_MSG_USERAUTH_GSSAPI_ERRTOK : |
| 828 | SSH2_MSG_USERAUTH_GSSAPI_TOKEN; |
| 829 | |
| 830 | if ((r = sshpkt_start(ssh, type)) != 0 || |
| 831 | (r = sshpkt_put_string(ssh, send_tok.value, |
| 832 | send_tok.length)) != 0 || |
| 833 | (r = sshpkt_send(ssh)) != 0) |
| 834 | fatal_fr(r, "send %u packet", type)sshfatal("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__ , 834, 1, SYSLOG_LEVEL_FATAL, ssh_err(r), "send %u packet", type ); |
| 835 | |
| 836 | gss_release_buffer(&ms, &send_tok); |
| 837 | } |
| 838 | |
| 839 | if (status == GSS_S_COMPLETE) { |
| 840 | /* send either complete or MIC, depending on mechanism */ |
| 841 | if (!(flags & GSS_C_INTEG_FLAG)) { |
| 842 | if ((r = sshpkt_start(ssh, |
| 843 | SSH2_MSG_USERAUTH_GSSAPI_EXCHANGE_COMPLETE)) != 0 || |
| 844 | (r = sshpkt_send(ssh)) != 0) |
| 845 | fatal_fr(r, "send completion")sshfatal("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__ , 845, 1, SYSLOG_LEVEL_FATAL, ssh_err(r), "send completion"); |
| 846 | } else { |
| 847 | struct sshbuf *b; |
| 848 | |
| 849 | if ((b = sshbuf_new()) == NULL((void *)0)) |
| 850 | fatal_f("sshbuf_new failed")sshfatal("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__ , 850, 1, SYSLOG_LEVEL_FATAL, ((void *)0), "sshbuf_new failed" ); |
| 851 | ssh_gssapi_buildmic(b, authctxt->server_user, |
| 852 | authctxt->service, "gssapi-with-mic", |
| 853 | ssh->kex->session_id); |
| 854 | |
| 855 | if ((gssbuf.value = sshbuf_mutable_ptr(b)) == NULL((void *)0)) |
| 856 | fatal_f("sshbuf_mutable_ptr failed")sshfatal("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__ , 856, 1, SYSLOG_LEVEL_FATAL, ((void *)0), "sshbuf_mutable_ptr failed" ); |
| 857 | gssbuf.length = sshbuf_len(b); |
| 858 | |
| 859 | status = ssh_gssapi_sign(gssctxt, &gssbuf, &mic); |
| 860 | |
| 861 | if (!GSS_ERROR(status)) { |
| 862 | if ((r = sshpkt_start(ssh, |
| 863 | SSH2_MSG_USERAUTH_GSSAPI_MIC)) != 0 || |
| 864 | (r = sshpkt_put_string(ssh, mic.value, |
| 865 | mic.length)) != 0 || |
| 866 | (r = sshpkt_send(ssh)) != 0) |
| 867 | fatal_fr(r, "send MIC")sshfatal("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__ , 867, 1, SYSLOG_LEVEL_FATAL, ssh_err(r), "send MIC"); |
| 868 | } |
| 869 | |
| 870 | sshbuf_free(b); |
| 871 | gss_release_buffer(&ms, &mic); |
| 872 | } |
| 873 | } |
| 874 | |
| 875 | return status; |
| 876 | } |
| 877 | |
| 878 | static int |
| 879 | input_gssapi_response(int type, u_int32_t plen, struct ssh *ssh) |
| 880 | { |
| 881 | Authctxt *authctxt = ssh->authctxt; |
| 882 | Gssctxt *gssctxt; |
| 883 | size_t oidlen; |
| 884 | u_char *oidv = NULL((void *)0); |
| 885 | int r; |
| 886 | |
| 887 | if (authctxt == NULL((void *)0)) |
| 888 | fatal("input_gssapi_response: no authentication context")sshfatal("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__ , 888, 0, SYSLOG_LEVEL_FATAL, ((void *)0), "input_gssapi_response: no authentication context" ); |
| 889 | gssctxt = authctxt->methoddata; |
| 890 | |
| 891 | /* Setup our OID */ |
| 892 | if ((r = sshpkt_get_string(ssh, &oidv, &oidlen)) != 0) |
| 893 | goto done; |
| 894 | |
| 895 | if (oidlen <= 2 || |
| 896 | oidv[0] != SSH_GSS_OIDTYPE || |
| 897 | oidv[1] != oidlen - 2) { |
| 898 | debug("Badly encoded mechanism OID received")sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__, 898, 0, SYSLOG_LEVEL_DEBUG1, ((void *)0), "Badly encoded mechanism OID received" ); |
| 899 | userauth(ssh, NULL((void *)0)); |
| 900 | goto ok; |
| 901 | } |
| 902 | |
| 903 | if (!ssh_gssapi_check_oid(gssctxt, oidv + 2, oidlen - 2)) |
| 904 | fatal("Server returned different OID than expected")sshfatal("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__ , 904, 0, SYSLOG_LEVEL_FATAL, ((void *)0), "Server returned different OID than expected" ); |
| 905 | |
| 906 | if ((r = sshpkt_get_end(ssh)) != 0) |
| 907 | goto done; |
| 908 | |
| 909 | if (GSS_ERROR(process_gssapi_token(ssh, GSS_C_NO_BUFFER))) { |
| 910 | /* Start again with next method on list */ |
| 911 | debug("Trying to start again")sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__, 911, 0, SYSLOG_LEVEL_DEBUG1, ((void *)0), "Trying to start again" ); |
| 912 | userauth(ssh, NULL((void *)0)); |
| 913 | goto ok; |
| 914 | } |
| 915 | ok: |
| 916 | r = 0; |
| 917 | done: |
| 918 | free(oidv); |
| 919 | return r; |
| 920 | } |
| 921 | |
| 922 | static int |
| 923 | input_gssapi_token(int type, u_int32_t plen, struct ssh *ssh) |
| 924 | { |
| 925 | Authctxt *authctxt = ssh->authctxt; |
| 926 | gss_buffer_desc recv_tok; |
| 927 | u_char *p = NULL((void *)0); |
| 928 | size_t len; |
| 929 | OM_uint32 status; |
| 930 | int r; |
| 931 | |
| 932 | if (authctxt == NULL((void *)0)) |
| 933 | fatal("input_gssapi_response: no authentication context")sshfatal("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__ , 933, 0, SYSLOG_LEVEL_FATAL, ((void *)0), "input_gssapi_response: no authentication context" ); |
| 934 | |
| 935 | if ((r = sshpkt_get_string(ssh, &p, &len)) != 0 || |
| 936 | (r = sshpkt_get_end(ssh)) != 0) |
| 937 | goto out; |
| 938 | |
| 939 | recv_tok.value = p; |
| 940 | recv_tok.length = len; |
| 941 | status = process_gssapi_token(ssh, &recv_tok); |
| 942 | |
| 943 | /* Start again with the next method in the list */ |
| 944 | if (GSS_ERROR(status)) { |
| 945 | userauth(ssh, NULL((void *)0)); |
| 946 | /* ok */ |
| 947 | } |
| 948 | r = 0; |
| 949 | out: |
| 950 | free(p); |
| 951 | return r; |
| 952 | } |
| 953 | |
| 954 | static int |
| 955 | input_gssapi_errtok(int type, u_int32_t plen, struct ssh *ssh) |
| 956 | { |
| 957 | Authctxt *authctxt = ssh->authctxt; |
| 958 | Gssctxt *gssctxt; |
| 959 | gss_buffer_desc send_tok = GSS_C_EMPTY_BUFFER; |
| 960 | gss_buffer_desc recv_tok; |
| 961 | OM_uint32 ms; |
| 962 | u_char *p = NULL((void *)0); |
| 963 | size_t len; |
| 964 | int r; |
| 965 | |
| 966 | if (authctxt == NULL((void *)0)) |
| 967 | fatal("input_gssapi_response: no authentication context")sshfatal("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__ , 967, 0, SYSLOG_LEVEL_FATAL, ((void *)0), "input_gssapi_response: no authentication context" ); |
| 968 | gssctxt = authctxt->methoddata; |
| 969 | |
| 970 | if ((r = sshpkt_get_string(ssh, &p, &len)) != 0 || |
| 971 | (r = sshpkt_get_end(ssh)) != 0) { |
| 972 | free(p); |
| 973 | return r; |
| 974 | } |
| 975 | |
| 976 | /* Stick it into GSSAPI and see what it says */ |
| 977 | recv_tok.value = p; |
| 978 | recv_tok.length = len; |
| 979 | (void)ssh_gssapi_init_ctx(gssctxt, options.gss_deleg_creds, |
| 980 | &recv_tok, &send_tok, NULL((void *)0)); |
| 981 | free(p); |
| 982 | gss_release_buffer(&ms, &send_tok); |
| 983 | |
| 984 | /* Server will be returning a failed packet after this one */ |
| 985 | return 0; |
| 986 | } |
| 987 | |
| 988 | static int |
| 989 | input_gssapi_error(int type, u_int32_t plen, struct ssh *ssh) |
| 990 | { |
| 991 | char *msg = NULL((void *)0); |
| 992 | char *lang = NULL((void *)0); |
| 993 | int r; |
| 994 | |
| 995 | if ((r = sshpkt_get_u32(ssh, NULL((void *)0))) != 0 || /* maj */ |
| 996 | (r = sshpkt_get_u32(ssh, NULL((void *)0))) != 0 || /* min */ |
| 997 | (r = sshpkt_get_cstring(ssh, &msg, NULL((void *)0))) != 0 || |
| 998 | (r = sshpkt_get_cstring(ssh, &lang, NULL((void *)0))) != 0) |
| 999 | goto out; |
| 1000 | r = sshpkt_get_end(ssh); |
| 1001 | debug("Server GSSAPI Error:\n%s", msg)sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__, 1001, 0, SYSLOG_LEVEL_DEBUG1, ((void *)0), "Server GSSAPI Error:\n%s" , msg); |
| 1002 | out: |
| 1003 | free(msg); |
| 1004 | free(lang); |
| 1005 | return r; |
| 1006 | } |
| 1007 | #endif /* GSSAPI */ |
| 1008 | |
| 1009 | static int |
| 1010 | userauth_none(struct ssh *ssh) |
| 1011 | { |
| 1012 | Authctxt *authctxt = (Authctxt *)ssh->authctxt; |
| 1013 | int r; |
| 1014 | |
| 1015 | /* initial userauth request */ |
| 1016 | if ((r = sshpkt_start(ssh, SSH2_MSG_USERAUTH_REQUEST50)) != 0 || |
| 1017 | (r = sshpkt_put_cstring(ssh, authctxt->server_user)) != 0 || |
| 1018 | (r = sshpkt_put_cstring(ssh, authctxt->service)) != 0 || |
| 1019 | (r = sshpkt_put_cstring(ssh, authctxt->method->name)) != 0 || |
| 1020 | (r = sshpkt_send(ssh)) != 0) |
| 1021 | fatal_fr(r, "send packet")sshfatal("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__ , 1021, 1, SYSLOG_LEVEL_FATAL, ssh_err(r), "send packet"); |
| 1022 | return 1; |
| 1023 | } |
| 1024 | |
| 1025 | static int |
| 1026 | userauth_passwd(struct ssh *ssh) |
| 1027 | { |
| 1028 | Authctxt *authctxt = (Authctxt *)ssh->authctxt; |
| 1029 | char *password, *prompt = NULL((void *)0); |
| 1030 | const char *host = options.host_key_alias ? options.host_key_alias : |
| 1031 | authctxt->host; |
| 1032 | int r; |
| 1033 | |
| 1034 | if (authctxt->attempt_passwd++ >= options.number_of_password_prompts) |
| 1035 | return 0; |
| 1036 | |
| 1037 | if (authctxt->attempt_passwd != 1) |
| 1038 | error("Permission denied, please try again.")sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__, 1038, 0, SYSLOG_LEVEL_ERROR, ((void *)0), "Permission denied, please try again." ); |
| 1039 | |
| 1040 | xasprintf(&prompt, "%s@%s's password: ", authctxt->server_user, host); |
| 1041 | password = read_passphrase(prompt, 0); |
| 1042 | if ((r = sshpkt_start(ssh, SSH2_MSG_USERAUTH_REQUEST50)) != 0 || |
| 1043 | (r = sshpkt_put_cstring(ssh, authctxt->server_user)) != 0 || |
| 1044 | (r = sshpkt_put_cstring(ssh, authctxt->service)) != 0 || |
| 1045 | (r = sshpkt_put_cstring(ssh, authctxt->method->name)) != 0 || |
| 1046 | (r = sshpkt_put_u8(ssh, 0)) != 0 || |
| 1047 | (r = sshpkt_put_cstring(ssh, password)) != 0 || |
| 1048 | (r = sshpkt_add_padding(ssh, 64)) != 0 || |
| 1049 | (r = sshpkt_send(ssh)) != 0) |
| 1050 | fatal_fr(r, "send packet")sshfatal("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__ , 1050, 1, SYSLOG_LEVEL_FATAL, ssh_err(r), "send packet"); |
| 1051 | |
| 1052 | free(prompt); |
| 1053 | if (password != NULL((void *)0)) |
| 1054 | freezero(password, strlen(password)); |
| 1055 | |
| 1056 | ssh_dispatch_set(ssh, SSH2_MSG_USERAUTH_PASSWD_CHANGEREQ60, |
| 1057 | &input_userauth_passwd_changereq); |
| 1058 | |
| 1059 | return 1; |
| 1060 | } |
| 1061 | |
| 1062 | /* |
| 1063 | * parse PASSWD_CHANGEREQ, prompt user and send SSH2_MSG_USERAUTH_REQUEST |
| 1064 | */ |
| 1065 | static int |
| 1066 | input_userauth_passwd_changereq(int type, u_int32_t seqnr, struct ssh *ssh) |
| 1067 | { |
| 1068 | Authctxt *authctxt = ssh->authctxt; |
| 1069 | char *info = NULL((void *)0), *lang = NULL((void *)0), *password = NULL((void *)0), *retype = NULL((void *)0); |
| 1070 | char prompt[256]; |
| 1071 | const char *host; |
| 1072 | int r; |
| 1073 | |
| 1074 | debug2("input_userauth_passwd_changereq")sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__, 1074, 0, SYSLOG_LEVEL_DEBUG2, ((void *)0), "input_userauth_passwd_changereq" ); |
| 1075 | |
| 1076 | if (authctxt == NULL((void *)0)) |
| 1077 | fatal("input_userauth_passwd_changereq: "sshfatal("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__ , 1078, 0, SYSLOG_LEVEL_FATAL, ((void *)0), "input_userauth_passwd_changereq: " "no authentication context") |
| 1078 | "no authentication context")sshfatal("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__ , 1078, 0, SYSLOG_LEVEL_FATAL, ((void *)0), "input_userauth_passwd_changereq: " "no authentication context"); |
| 1079 | host = options.host_key_alias ? options.host_key_alias : authctxt->host; |
| 1080 | |
| 1081 | if ((r = sshpkt_get_cstring(ssh, &info, NULL((void *)0))) != 0 || |
| 1082 | (r = sshpkt_get_cstring(ssh, &lang, NULL((void *)0))) != 0) |
| 1083 | goto out; |
| 1084 | if (strlen(info) > 0) |
| 1085 | logit("%s", info)sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__, 1085, 0, SYSLOG_LEVEL_INFO, ((void *)0), "%s", info); |
| 1086 | if ((r = sshpkt_start(ssh, SSH2_MSG_USERAUTH_REQUEST50)) != 0 || |
| 1087 | (r = sshpkt_put_cstring(ssh, authctxt->server_user)) != 0 || |
| 1088 | (r = sshpkt_put_cstring(ssh, authctxt->service)) != 0 || |
| 1089 | (r = sshpkt_put_cstring(ssh, authctxt->method->name)) != 0 || |
| 1090 | (r = sshpkt_put_u8(ssh, 1)) != 0) /* additional info */ |
| 1091 | goto out; |
| 1092 | |
| 1093 | snprintf(prompt, sizeof(prompt), |
| 1094 | "Enter %.30s@%.128s's old password: ", |
| 1095 | authctxt->server_user, host); |
| 1096 | password = read_passphrase(prompt, 0); |
| 1097 | if ((r = sshpkt_put_cstring(ssh, password)) != 0) |
| 1098 | goto out; |
| 1099 | |
| 1100 | freezero(password, strlen(password)); |
| 1101 | password = NULL((void *)0); |
| 1102 | while (password == NULL((void *)0)) { |
| 1103 | snprintf(prompt, sizeof(prompt), |
| 1104 | "Enter %.30s@%.128s's new password: ", |
| 1105 | authctxt->server_user, host); |
| 1106 | password = read_passphrase(prompt, RP_ALLOW_EOF0x0004); |
| 1107 | if (password == NULL((void *)0)) { |
| 1108 | /* bail out */ |
| 1109 | r = 0; |
| 1110 | goto out; |
| 1111 | } |
| 1112 | snprintf(prompt, sizeof(prompt), |
| 1113 | "Retype %.30s@%.128s's new password: ", |
| 1114 | authctxt->server_user, host); |
| 1115 | retype = read_passphrase(prompt, 0); |
| 1116 | if (strcmp(password, retype) != 0) { |
| 1117 | freezero(password, strlen(password)); |
| 1118 | logit("Mismatch; try again, EOF to quit.")sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__, 1118, 0, SYSLOG_LEVEL_INFO, ((void *)0), "Mismatch; try again, EOF to quit." ); |
| 1119 | password = NULL((void *)0); |
| 1120 | } |
| 1121 | freezero(retype, strlen(retype)); |
| 1122 | } |
| 1123 | if ((r = sshpkt_put_cstring(ssh, password)) != 0 || |
| 1124 | (r = sshpkt_add_padding(ssh, 64)) != 0 || |
| 1125 | (r = sshpkt_send(ssh)) != 0) |
| 1126 | goto out; |
| 1127 | |
| 1128 | ssh_dispatch_set(ssh, SSH2_MSG_USERAUTH_PASSWD_CHANGEREQ60, |
| 1129 | &input_userauth_passwd_changereq); |
| 1130 | r = 0; |
| 1131 | out: |
| 1132 | if (password) |
| 1133 | freezero(password, strlen(password)); |
| 1134 | free(info); |
| 1135 | free(lang); |
| 1136 | return r; |
| 1137 | } |
| 1138 | |
| 1139 | /* |
| 1140 | * Select an algorithm for publickey signatures. |
| 1141 | * Returns algorithm (caller must free) or NULL if no mutual algorithm found. |
| 1142 | * |
| 1143 | * Call with ssh==NULL to ignore server-sig-algs extension list and |
| 1144 | * only attempt with the key's base signature type. |
| 1145 | */ |
| 1146 | static char * |
| 1147 | key_sig_algorithm(struct ssh *ssh, const struct sshkey *key) |
| 1148 | { |
| 1149 | char *allowed, *oallowed, *cp, *tmp, *alg = NULL((void *)0); |
| 1150 | const char *server_sig_algs; |
| 1151 | |
| 1152 | /* |
| 1153 | * The signature algorithm will only differ from the key algorithm |
| 1154 | * for RSA keys/certs and when the server advertises support for |
| 1155 | * newer (SHA2) algorithms. |
| 1156 | */ |
| 1157 | if (ssh == NULL((void *)0) || ssh->kex->server_sig_algs == NULL((void *)0) || |
| 1158 | (key->type != KEY_RSA && key->type != KEY_RSA_CERT) || |
| 1159 | (key->type == KEY_RSA_CERT && (ssh->compat & SSH_BUG_SIGTYPE0x00000002))) { |
| 1160 | /* Filter base key signature alg against our configuration */ |
| 1161 | return match_list(sshkey_ssh_name(key), |
| 1162 | options.pubkey_accepted_algos, NULL((void *)0)); |
| 1163 | } |
| 1164 | |
| 1165 | /* |
| 1166 | * Workaround OpenSSH 7.4 bug: this version supports RSA/SHA-2 but |
| 1167 | * fails to advertise it via SSH2_MSG_EXT_INFO. |
| 1168 | */ |
| 1169 | server_sig_algs = ssh->kex->server_sig_algs; |
| 1170 | if (key->type == KEY_RSA && (ssh->compat & SSH_BUG_SIGTYPE740x00000004)) |
| 1171 | server_sig_algs = "rsa-sha2-256,rsa-sha2-512"; |
| 1172 | |
| 1173 | /* |
| 1174 | * For RSA keys/certs, since these might have a different sig type: |
| 1175 | * find the first entry in PubkeyAcceptedAlgorithms of the right type |
| 1176 | * that also appears in the supported signature algorithms list from |
| 1177 | * the server. |
| 1178 | */ |
| 1179 | oallowed = allowed = xstrdup(options.pubkey_accepted_algos); |
| 1180 | while ((cp = strsep(&allowed, ",")) != NULL((void *)0)) { |
| 1181 | if (sshkey_type_from_name(cp) != key->type) |
| 1182 | continue; |
| 1183 | tmp = match_list(sshkey_sigalg_by_name(cp), |
| 1184 | server_sig_algs, NULL((void *)0)); |
| 1185 | if (tmp != NULL((void *)0)) |
| 1186 | alg = xstrdup(cp); |
| 1187 | free(tmp); |
| 1188 | if (alg != NULL((void *)0)) |
| 1189 | break; |
| 1190 | } |
| 1191 | free(oallowed); |
| 1192 | return alg; |
| 1193 | } |
| 1194 | |
| 1195 | static int |
| 1196 | identity_sign(struct identity *id, u_char **sigp, size_t *lenp, |
| 1197 | const u_char *data, size_t datalen, u_int compat, const char *alg) |
| 1198 | { |
| 1199 | struct sshkey *sign_key = NULL((void *)0), *prv = NULL((void *)0); |
| 1200 | int is_agent = 0, retried = 0, r = SSH_ERR_INTERNAL_ERROR-1; |
| 1201 | struct notifier_ctx *notifier = NULL((void *)0); |
| 1202 | char *fp = NULL((void *)0), *pin = NULL((void *)0), *prompt = NULL((void *)0); |
| 1203 | |
| 1204 | *sigp = NULL((void *)0); |
| 1205 | *lenp = 0; |
| 1206 | |
| 1207 | /* The agent supports this key. */ |
| 1208 | if (id->key != NULL((void *)0) && id->agent_fd != -1) { |
| 1209 | return ssh_agent_sign(id->agent_fd, id->key, sigp, lenp, |
| 1210 | data, datalen, alg, compat); |
| 1211 | } |
| 1212 | |
| 1213 | /* |
| 1214 | * We have already loaded the private key or the private key is |
| 1215 | * stored in external hardware. |
| 1216 | */ |
| 1217 | if (id->key != NULL((void *)0) && |
| 1218 | (id->isprivate || (id->key->flags & SSHKEY_FLAG_EXT0x0001))) { |
| 1219 | sign_key = id->key; |
| 1220 | is_agent = 1; |
| 1221 | } else { |
| 1222 | /* Load the private key from the file. */ |
| 1223 | if ((prv = load_identity_file(id)) == NULL((void *)0)) |
| 1224 | return SSH_ERR_KEY_NOT_FOUND-46; |
| 1225 | if (id->key != NULL((void *)0) && !sshkey_equal_public(prv, id->key)) { |
| 1226 | error_f("private key %s contents do not match public",sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__, 1227, 1, SYSLOG_LEVEL_ERROR, ((void *)0), "private key %s contents do not match public" , id->filename) |
| 1227 | id->filename)sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__, 1227, 1, SYSLOG_LEVEL_ERROR, ((void *)0), "private key %s contents do not match public" , id->filename); |
| 1228 | r = SSH_ERR_KEY_NOT_FOUND-46; |
| 1229 | goto out; |
| 1230 | } |
| 1231 | sign_key = prv; |
| 1232 | } |
| 1233 | retry_pin: |
| 1234 | /* Prompt for touch for non-agent FIDO keys that request UP */ |
| 1235 | if (!is_agent && sshkey_is_sk(sign_key) && |
| 1236 | (sign_key->sk_flags & SSH_SK_USER_PRESENCE_REQD0x01)) { |
| 1237 | /* XXX should batch mode just skip these? */ |
| 1238 | if ((fp = sshkey_fingerprint(sign_key, |
| 1239 | options.fingerprint_hash, SSH_FP_DEFAULT)) == NULL((void *)0)) |
| 1240 | fatal_f("fingerprint failed")sshfatal("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__ , 1240, 1, SYSLOG_LEVEL_FATAL, ((void *)0), "fingerprint failed" ); |
| 1241 | notifier = notify_start(options.batch_mode, |
| 1242 | "Confirm user presence for key %s %s", |
| 1243 | sshkey_type(sign_key), fp); |
| 1244 | free(fp); |
| 1245 | } |
| 1246 | if ((r = sshkey_sign(sign_key, sigp, lenp, data, datalen, |
| 1247 | alg, options.sk_provider, pin, compat)) != 0) { |
| 1248 | debug_fr(r, "sshkey_sign")sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__, 1248, 1, SYSLOG_LEVEL_DEBUG1, ssh_err(r), "sshkey_sign"); |
| 1249 | if (!retried && pin == NULL((void *)0) && !is_agent && |
| 1250 | sshkey_is_sk(sign_key) && |
| 1251 | r == SSH_ERR_KEY_WRONG_PASSPHRASE-43) { |
| 1252 | notify_complete(notifier, NULL((void *)0)); |
| 1253 | notifier = NULL((void *)0); |
| 1254 | xasprintf(&prompt, "Enter PIN for %s key %s: ", |
| 1255 | sshkey_type(sign_key), id->filename); |
| 1256 | pin = read_passphrase(prompt, 0); |
| 1257 | retried = 1; |
| 1258 | goto retry_pin; |
| 1259 | } |
| 1260 | goto out; |
| 1261 | } |
| 1262 | |
| 1263 | /* |
| 1264 | * PKCS#11 tokens may not support all signature algorithms, |
| 1265 | * so check what we get back. |
| 1266 | */ |
| 1267 | if ((r = sshkey_check_sigtype(*sigp, *lenp, alg)) != 0) { |
| 1268 | debug_fr(r, "sshkey_check_sigtype")sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__, 1268, 1, SYSLOG_LEVEL_DEBUG1, ssh_err(r), "sshkey_check_sigtype" ); |
| 1269 | goto out; |
| 1270 | } |
| 1271 | /* success */ |
| 1272 | r = 0; |
| 1273 | out: |
| 1274 | free(prompt); |
| 1275 | if (pin != NULL((void *)0)) |
| 1276 | freezero(pin, strlen(pin)); |
| 1277 | notify_complete(notifier, r == 0 ? "User presence confirmed" : NULL((void *)0)); |
| 1278 | sshkey_free(prv); |
| 1279 | return r; |
| 1280 | } |
| 1281 | |
| 1282 | static int |
| 1283 | id_filename_matches(Identity *id, Identity *private_id) |
| 1284 | { |
| 1285 | static const char * const suffixes[] = { ".pub", "-cert.pub", NULL((void *)0) }; |
| 1286 | size_t len = strlen(id->filename), plen = strlen(private_id->filename); |
| 1287 | size_t i, slen; |
| 1288 | |
| 1289 | if (strcmp(id->filename, private_id->filename) == 0) |
| 1290 | return 1; |
| 1291 | for (i = 0; suffixes[i]; i++) { |
| 1292 | slen = strlen(suffixes[i]); |
| 1293 | if (len > slen && plen == len - slen && |
| 1294 | strcmp(id->filename + (len - slen), suffixes[i]) == 0 && |
| 1295 | memcmp(id->filename, private_id->filename, plen) == 0) |
| 1296 | return 1; |
| 1297 | } |
| 1298 | return 0; |
| 1299 | } |
| 1300 | |
| 1301 | static int |
| 1302 | sign_and_send_pubkey(struct ssh *ssh, Identity *id) |
| 1303 | { |
| 1304 | Authctxt *authctxt = (Authctxt *)ssh->authctxt; |
| 1305 | struct sshbuf *b = NULL((void *)0); |
| 1306 | Identity *private_id, *sign_id = NULL((void *)0); |
| 1307 | u_char *signature = NULL((void *)0); |
| 1308 | size_t slen = 0, skip = 0; |
| 1309 | int r, fallback_sigtype, sent = 0; |
| 1310 | char *alg = NULL((void *)0), *fp = NULL((void *)0); |
| 1311 | const char *loc = "", *method = "publickey"; |
| 1312 | int hostbound = 0; |
| 1313 | |
| 1314 | /* prefer host-bound pubkey signatures if supported by server */ |
| 1315 | if ((ssh->kex->flags & KEX_HAS_PUBKEY_HOSTBOUND0x0004) != 0 && |
| 1316 | (options.pubkey_authentication & SSH_PUBKEY_AUTH_HBOUND0x02) != 0) { |
| 1317 | hostbound = 1; |
| 1318 | method = "publickey-hostbound-v00@openssh.com"; |
| 1319 | } |
| 1320 | |
| 1321 | if ((fp = sshkey_fingerprint(id->key, options.fingerprint_hash, |
| 1322 | SSH_FP_DEFAULT)) == NULL((void *)0)) |
| 1323 | return 0; |
| 1324 | |
| 1325 | debug3_f("using %s with %s %s", method, sshkey_type(id->key), fp)sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__, 1325, 1, SYSLOG_LEVEL_DEBUG3, ((void *)0), "using %s with %s %s" , method, sshkey_type(id->key), fp); |
| 1326 | |
| 1327 | /* |
| 1328 | * If the key is an certificate, try to find a matching private key |
| 1329 | * and use it to complete the signature. |
| 1330 | * If no such private key exists, fall back to trying the certificate |
| 1331 | * key itself in case it has a private half already loaded. |
| 1332 | * This will try to set sign_id to the private key that will perform |
| 1333 | * the signature. |
| 1334 | */ |
| 1335 | if (sshkey_is_cert(id->key)) { |
| 1336 | TAILQ_FOREACH(private_id, &authctxt->keys, next)for((private_id) = ((&authctxt->keys)->tqh_first); ( private_id) != ((void *)0); (private_id) = ((private_id)-> next.tqe_next)) { |
| 1337 | if (sshkey_equal_public(id->key, private_id->key) && |
| 1338 | id->key->type != private_id->key->type) { |
| 1339 | sign_id = private_id; |
| 1340 | break; |
| 1341 | } |
| 1342 | } |
| 1343 | /* |
| 1344 | * Exact key matches are preferred, but also allow |
| 1345 | * filename matches for non-PKCS#11/agent keys that |
| 1346 | * didn't load public keys. This supports the case |
| 1347 | * of keeping just a private key file and public |
| 1348 | * certificate on disk. |
| 1349 | */ |
| 1350 | if (sign_id == NULL((void *)0) && |
| 1351 | !id->isprivate && id->agent_fd == -1 && |
| 1352 | (id->key->flags & SSHKEY_FLAG_EXT0x0001) == 0) { |
| 1353 | TAILQ_FOREACH(private_id, &authctxt->keys, next)for((private_id) = ((&authctxt->keys)->tqh_first); ( private_id) != ((void *)0); (private_id) = ((private_id)-> next.tqe_next)) { |
| 1354 | if (private_id->key == NULL((void *)0) && |
| 1355 | id_filename_matches(id, private_id)) { |
| 1356 | sign_id = private_id; |
| 1357 | break; |
| 1358 | } |
| 1359 | } |
| 1360 | } |
| 1361 | if (sign_id != NULL((void *)0)) { |
| 1362 | debug2_f("using private key \"%s\"%s for "sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__, 1364, 1, SYSLOG_LEVEL_DEBUG2, ((void *)0), "using private key \"%s\"%s for " "certificate", sign_id->filename, sign_id->agent_fd != -1 ? " from agent" : "") |
| 1363 | "certificate", sign_id->filename,sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__, 1364, 1, SYSLOG_LEVEL_DEBUG2, ((void *)0), "using private key \"%s\"%s for " "certificate", sign_id->filename, sign_id->agent_fd != -1 ? " from agent" : "") |
| 1364 | sign_id->agent_fd != -1 ? " from agent" : "")sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__, 1364, 1, SYSLOG_LEVEL_DEBUG2, ((void *)0), "using private key \"%s\"%s for " "certificate", sign_id->filename, sign_id->agent_fd != -1 ? " from agent" : ""); |
| 1365 | } else { |
| 1366 | debug_f("no separate private key for certificate "sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__, 1367, 1, SYSLOG_LEVEL_DEBUG1, ((void *)0), "no separate private key for certificate " "\"%s\"", id->filename) |
| 1367 | "\"%s\"", id->filename)sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__, 1367, 1, SYSLOG_LEVEL_DEBUG1, ((void *)0), "no separate private key for certificate " "\"%s\"", id->filename); |
| 1368 | } |
| 1369 | } |
| 1370 | |
| 1371 | /* |
| 1372 | * If the above didn't select another identity to do the signing |
| 1373 | * then default to the one we started with. |
| 1374 | */ |
| 1375 | if (sign_id == NULL((void *)0)) |
| 1376 | sign_id = id; |
| 1377 | |
| 1378 | /* assemble and sign data */ |
| 1379 | for (fallback_sigtype = 0; fallback_sigtype <= 1; fallback_sigtype++) { |
| 1380 | free(alg); |
| 1381 | slen = 0; |
| 1382 | signature = NULL((void *)0); |
| 1383 | if ((alg = key_sig_algorithm(fallback_sigtype ? NULL((void *)0) : ssh, |
| 1384 | id->key)) == NULL((void *)0)) { |
| 1385 | error_f("no mutual signature supported")sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__, 1385, 1, SYSLOG_LEVEL_ERROR, ((void *)0), "no mutual signature supported" ); |
| 1386 | goto out; |
| 1387 | } |
| 1388 | debug3_f("signing using %s %s", alg, fp)sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__, 1388, 1, SYSLOG_LEVEL_DEBUG3, ((void *)0), "signing using %s %s" , alg, fp); |
| 1389 | |
| 1390 | sshbuf_free(b); |
| 1391 | if ((b = sshbuf_new()) == NULL((void *)0)) |
| 1392 | fatal_f("sshbuf_new failed")sshfatal("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__ , 1392, 1, SYSLOG_LEVEL_FATAL, ((void *)0), "sshbuf_new failed" ); |
| 1393 | if (ssh->compat & SSH_OLD_SESSIONID0x00000010) { |
| 1394 | if ((r = sshbuf_putb(b, ssh->kex->session_id)) != 0) |
| 1395 | fatal_fr(r, "sshbuf_putb")sshfatal("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__ , 1395, 1, SYSLOG_LEVEL_FATAL, ssh_err(r), "sshbuf_putb"); |
| 1396 | } else { |
| 1397 | if ((r = sshbuf_put_stringb(b, |
| 1398 | ssh->kex->session_id)) != 0) |
| 1399 | fatal_fr(r, "sshbuf_put_stringb")sshfatal("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__ , 1399, 1, SYSLOG_LEVEL_FATAL, ssh_err(r), "sshbuf_put_stringb" ); |
| 1400 | } |
| 1401 | skip = sshbuf_len(b); |
| 1402 | if ((r = sshbuf_put_u8(b, SSH2_MSG_USERAUTH_REQUEST50)) != 0 || |
| 1403 | (r = sshbuf_put_cstring(b, authctxt->server_user)) != 0 || |
| 1404 | (r = sshbuf_put_cstring(b, authctxt->service)) != 0 || |
| 1405 | (r = sshbuf_put_cstring(b, method)) != 0 || |
| 1406 | (r = sshbuf_put_u8(b, 1)) != 0 || |
| 1407 | (r = sshbuf_put_cstring(b, alg)) != 0 || |
| 1408 | (r = sshkey_puts(id->key, b)) != 0) { |
| 1409 | fatal_fr(r, "assemble signed data")sshfatal("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__ , 1409, 1, SYSLOG_LEVEL_FATAL, ssh_err(r), "assemble signed data" ); |
| 1410 | } |
| 1411 | if (hostbound) { |
| 1412 | if (ssh->kex->initial_hostkey == NULL((void *)0)) { |
| 1413 | fatal_f("internal error: initial hostkey "sshfatal("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__ , 1414, 1, SYSLOG_LEVEL_FATAL, ((void *)0), "internal error: initial hostkey " "not recorded") |
| 1414 | "not recorded")sshfatal("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__ , 1414, 1, SYSLOG_LEVEL_FATAL, ((void *)0), "internal error: initial hostkey " "not recorded"); |
| 1415 | } |
| 1416 | if ((r = sshkey_puts(ssh->kex->initial_hostkey, b)) != 0) |
| 1417 | fatal_fr(r, "assemble %s hostkey", method)sshfatal("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__ , 1417, 1, SYSLOG_LEVEL_FATAL, ssh_err(r), "assemble %s hostkey" , method); |
| 1418 | } |
| 1419 | /* generate signature */ |
| 1420 | r = identity_sign(sign_id, &signature, &slen, |
| 1421 | sshbuf_ptr(b), sshbuf_len(b), ssh->compat, alg); |
| 1422 | if (r == 0) |
| 1423 | break; |
| 1424 | else if (r == SSH_ERR_KEY_NOT_FOUND-46) |
| 1425 | goto out; /* soft failure */ |
| 1426 | else if (r == SSH_ERR_SIGN_ALG_UNSUPPORTED-58 && |
| 1427 | !fallback_sigtype) { |
| 1428 | if (sign_id->agent_fd != -1) |
| 1429 | loc = "agent "; |
| 1430 | else if ((sign_id->key->flags & SSHKEY_FLAG_EXT0x0001) != 0) |
| 1431 | loc = "token "; |
| 1432 | logit("%skey %s %s returned incorrect signature type",sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__, 1433, 0, SYSLOG_LEVEL_INFO, ((void *)0), "%skey %s %s returned incorrect signature type" , loc, sshkey_type(id->key), fp) |
| 1433 | loc, sshkey_type(id->key), fp)sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__, 1433, 0, SYSLOG_LEVEL_INFO, ((void *)0), "%skey %s %s returned incorrect signature type" , loc, sshkey_type(id->key), fp); |
| 1434 | continue; |
| 1435 | } |
| 1436 | error_fr(r, "signing failed for %s \"%s\"%s",sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__, 1438, 1, SYSLOG_LEVEL_ERROR, ssh_err(r), "signing failed for %s \"%s\"%s" , sshkey_type(sign_id->key), sign_id->filename, id-> agent_fd != -1 ? " from agent" : "") |
| 1437 | sshkey_type(sign_id->key), sign_id->filename,sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__, 1438, 1, SYSLOG_LEVEL_ERROR, ssh_err(r), "signing failed for %s \"%s\"%s" , sshkey_type(sign_id->key), sign_id->filename, id-> agent_fd != -1 ? " from agent" : "") |
| 1438 | id->agent_fd != -1 ? " from agent" : "")sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__, 1438, 1, SYSLOG_LEVEL_ERROR, ssh_err(r), "signing failed for %s \"%s\"%s" , sshkey_type(sign_id->key), sign_id->filename, id-> agent_fd != -1 ? " from agent" : ""); |
| 1439 | goto out; |
| 1440 | } |
| 1441 | if (slen == 0 || signature == NULL((void *)0)) /* shouldn't happen */ |
| 1442 | fatal_f("no signature")sshfatal("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__ , 1442, 1, SYSLOG_LEVEL_FATAL, ((void *)0), "no signature"); |
| 1443 | |
| 1444 | /* append signature */ |
| 1445 | if ((r = sshbuf_put_string(b, signature, slen)) != 0) |
| 1446 | fatal_fr(r, "append signature")sshfatal("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__ , 1446, 1, SYSLOG_LEVEL_FATAL, ssh_err(r), "append signature" ); |
| 1447 | |
| 1448 | #ifdef DEBUG_PK |
| 1449 | sshbuf_dump(b, stderr(&__sF[2])); |
| 1450 | #endif |
| 1451 | /* skip session id and packet type */ |
| 1452 | if ((r = sshbuf_consume(b, skip + 1)) != 0) |
| 1453 | fatal_fr(r, "consume")sshfatal("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__ , 1453, 1, SYSLOG_LEVEL_FATAL, ssh_err(r), "consume"); |
| 1454 | |
| 1455 | /* put remaining data from buffer into packet */ |
| 1456 | if ((r = sshpkt_start(ssh, SSH2_MSG_USERAUTH_REQUEST50)) != 0 || |
| 1457 | (r = sshpkt_putb(ssh, b)) != 0 || |
| 1458 | (r = sshpkt_send(ssh)) != 0) |
| 1459 | fatal_fr(r, "enqueue request")sshfatal("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__ , 1459, 1, SYSLOG_LEVEL_FATAL, ssh_err(r), "enqueue request"); |
| 1460 | |
| 1461 | /* success */ |
| 1462 | sent = 1; |
| 1463 | |
| 1464 | out: |
| 1465 | free(fp); |
| 1466 | free(alg); |
| 1467 | sshbuf_free(b); |
| 1468 | freezero(signature, slen); |
| 1469 | return sent; |
| 1470 | } |
| 1471 | |
| 1472 | static int |
| 1473 | send_pubkey_test(struct ssh *ssh, Identity *id) |
| 1474 | { |
| 1475 | Authctxt *authctxt = (Authctxt *)ssh->authctxt; |
| 1476 | u_char *blob = NULL((void *)0); |
| 1477 | char *alg = NULL((void *)0); |
| 1478 | size_t bloblen; |
| 1479 | u_int have_sig = 0; |
| 1480 | int sent = 0, r; |
| 1481 | |
| 1482 | if ((alg = key_sig_algorithm(ssh, id->key)) == NULL((void *)0)) { |
| 1483 | debug_f("no mutual signature algorithm")sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__, 1483, 1, SYSLOG_LEVEL_DEBUG1, ((void *)0), "no mutual signature algorithm" ); |
| 1484 | goto out; |
| 1485 | } |
| 1486 | |
| 1487 | if ((r = sshkey_to_blob(id->key, &blob, &bloblen)) != 0) { |
Although the value stored to 'r' is used in the enclosing expression, the value is never actually read from 'r' | |
| 1488 | /* we cannot handle this key */ |
| 1489 | debug3_f("cannot handle key")sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__, 1489, 1, SYSLOG_LEVEL_DEBUG3, ((void *)0), "cannot handle key" ); |
| 1490 | goto out; |
| 1491 | } |
| 1492 | /* register callback for USERAUTH_PK_OK message */ |
| 1493 | ssh_dispatch_set(ssh, SSH2_MSG_USERAUTH_PK_OK60, &input_userauth_pk_ok); |
| 1494 | |
| 1495 | if ((r = sshpkt_start(ssh, SSH2_MSG_USERAUTH_REQUEST50)) != 0 || |
| 1496 | (r = sshpkt_put_cstring(ssh, authctxt->server_user)) != 0 || |
| 1497 | (r = sshpkt_put_cstring(ssh, authctxt->service)) != 0 || |
| 1498 | (r = sshpkt_put_cstring(ssh, authctxt->method->name)) != 0 || |
| 1499 | (r = sshpkt_put_u8(ssh, have_sig)) != 0 || |
| 1500 | (r = sshpkt_put_cstring(ssh, alg)) != 0 || |
| 1501 | (r = sshpkt_put_string(ssh, blob, bloblen)) != 0 || |
| 1502 | (r = sshpkt_send(ssh)) != 0) |
| 1503 | fatal_fr(r, "send packet")sshfatal("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__ , 1503, 1, SYSLOG_LEVEL_FATAL, ssh_err(r), "send packet"); |
| 1504 | sent = 1; |
| 1505 | |
| 1506 | out: |
| 1507 | free(alg); |
| 1508 | free(blob); |
| 1509 | return sent; |
| 1510 | } |
| 1511 | |
| 1512 | static struct sshkey * |
| 1513 | load_identity_file(Identity *id) |
| 1514 | { |
| 1515 | struct sshkey *private = NULL((void *)0); |
| 1516 | char prompt[300], *passphrase, *comment; |
| 1517 | int r, quit = 0, i; |
| 1518 | struct stat st; |
| 1519 | |
| 1520 | if (stat(id->filename, &st) == -1) { |
| 1521 | do_log2(id->userprovided ?sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__, 1523, 0, id->userprovided ? SYSLOG_LEVEL_INFO : SYSLOG_LEVEL_DEBUG3 , ((void *)0), "no such identity: %s: %s", id->filename, strerror ((*__errno()))) |
| 1522 | SYSLOG_LEVEL_INFO : SYSLOG_LEVEL_DEBUG3,sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__, 1523, 0, id->userprovided ? SYSLOG_LEVEL_INFO : SYSLOG_LEVEL_DEBUG3 , ((void *)0), "no such identity: %s: %s", id->filename, strerror ((*__errno()))) |
| 1523 | "no such identity: %s: %s", id->filename, strerror(errno))sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__, 1523, 0, id->userprovided ? SYSLOG_LEVEL_INFO : SYSLOG_LEVEL_DEBUG3 , ((void *)0), "no such identity: %s: %s", id->filename, strerror ((*__errno()))); |
| 1524 | return NULL((void *)0); |
| 1525 | } |
| 1526 | snprintf(prompt, sizeof prompt, |
| 1527 | "Enter passphrase for key '%.100s': ", id->filename); |
| 1528 | for (i = 0; i <= options.number_of_password_prompts; i++) { |
| 1529 | if (i == 0) |
| 1530 | passphrase = ""; |
| 1531 | else { |
| 1532 | passphrase = read_passphrase(prompt, 0); |
| 1533 | if (*passphrase == '\0') { |
| 1534 | debug2("no passphrase given, try next key")sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__, 1534, 0, SYSLOG_LEVEL_DEBUG2, ((void *)0), "no passphrase given, try next key" ); |
| 1535 | free(passphrase); |
| 1536 | break; |
| 1537 | } |
| 1538 | } |
| 1539 | switch ((r = sshkey_load_private_type(KEY_UNSPEC, id->filename, |
| 1540 | passphrase, &private, &comment))) { |
| 1541 | case 0: |
| 1542 | break; |
| 1543 | case SSH_ERR_KEY_WRONG_PASSPHRASE-43: |
| 1544 | if (options.batch_mode) { |
| 1545 | quit = 1; |
| 1546 | break; |
| 1547 | } |
| 1548 | if (i != 0) |
| 1549 | debug2("bad passphrase given, try again...")sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__, 1549, 0, SYSLOG_LEVEL_DEBUG2, ((void *)0), "bad passphrase given, try again..." ); |
| 1550 | break; |
| 1551 | case SSH_ERR_SYSTEM_ERROR-24: |
| 1552 | if (errno(*__errno()) == ENOENT2) { |
| 1553 | debug2_r(r, "Load key \"%s\"", id->filename)sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__, 1553, 0, SYSLOG_LEVEL_DEBUG2, ssh_err(r), "Load key \"%s\"", id->filename); |
| 1554 | quit = 1; |
| 1555 | break; |
| 1556 | } |
| 1557 | /* FALLTHROUGH */ |
| 1558 | default: |
| 1559 | error_r(r, "Load key \"%s\"", id->filename)sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__, 1559, 0, SYSLOG_LEVEL_ERROR, ssh_err(r), "Load key \"%s\"", id ->filename); |
| 1560 | quit = 1; |
| 1561 | break; |
| 1562 | } |
| 1563 | if (private != NULL((void *)0) && sshkey_is_sk(private) && |
| 1564 | options.sk_provider == NULL((void *)0)) { |
| 1565 | debug("key \"%s\" is an authenticator-hosted key, "sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__, 1566, 0, SYSLOG_LEVEL_DEBUG1, ((void *)0), "key \"%s\" is an authenticator-hosted key, " "but no provider specified", id->filename) |
| 1566 | "but no provider specified", id->filename)sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__, 1566, 0, SYSLOG_LEVEL_DEBUG1, ((void *)0), "key \"%s\" is an authenticator-hosted key, " "but no provider specified", id->filename); |
| 1567 | sshkey_free(private); |
| 1568 | private = NULL((void *)0); |
| 1569 | quit = 1; |
| 1570 | } |
| 1571 | if (!quit && (r = sshkey_check_rsa_length(private, |
| 1572 | options.required_rsa_size)) != 0) { |
| 1573 | debug_fr(r, "Skipping key %s", id->filename)sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__, 1573, 1, SYSLOG_LEVEL_DEBUG1, ssh_err(r), "Skipping key %s", id->filename); |
| 1574 | sshkey_free(private); |
| 1575 | private = NULL((void *)0); |
| 1576 | quit = 1; |
| 1577 | } |
| 1578 | if (!quit && private != NULL((void *)0) && id->agent_fd == -1 && |
| 1579 | !(id->key && id->isprivate)) |
| 1580 | maybe_add_key_to_agent(id->filename, private, comment, |
| 1581 | passphrase); |
| 1582 | if (i > 0) |
| 1583 | freezero(passphrase, strlen(passphrase)); |
| 1584 | free(comment); |
| 1585 | if (private != NULL((void *)0) || quit) |
| 1586 | break; |
| 1587 | } |
| 1588 | return private; |
| 1589 | } |
| 1590 | |
| 1591 | static int |
| 1592 | key_type_allowed_by_config(struct sshkey *key) |
| 1593 | { |
| 1594 | if (match_pattern_list(sshkey_ssh_name(key), |
| 1595 | options.pubkey_accepted_algos, 0) == 1) |
| 1596 | return 1; |
| 1597 | |
| 1598 | /* RSA keys/certs might be allowed by alternate signature types */ |
| 1599 | switch (key->type) { |
| 1600 | case KEY_RSA: |
| 1601 | if (match_pattern_list("rsa-sha2-512", |
| 1602 | options.pubkey_accepted_algos, 0) == 1) |
| 1603 | return 1; |
| 1604 | if (match_pattern_list("rsa-sha2-256", |
| 1605 | options.pubkey_accepted_algos, 0) == 1) |
| 1606 | return 1; |
| 1607 | break; |
| 1608 | case KEY_RSA_CERT: |
| 1609 | if (match_pattern_list("rsa-sha2-512-cert-v01@openssh.com", |
| 1610 | options.pubkey_accepted_algos, 0) == 1) |
| 1611 | return 1; |
| 1612 | if (match_pattern_list("rsa-sha2-256-cert-v01@openssh.com", |
| 1613 | options.pubkey_accepted_algos, 0) == 1) |
| 1614 | return 1; |
| 1615 | break; |
| 1616 | } |
| 1617 | return 0; |
| 1618 | } |
| 1619 | |
| 1620 | /* obtain a list of keys from the agent */ |
| 1621 | static int |
| 1622 | get_agent_identities(struct ssh *ssh, int *agent_fdp, |
| 1623 | struct ssh_identitylist **idlistp) |
| 1624 | { |
| 1625 | int r, agent_fd; |
| 1626 | struct ssh_identitylist *idlist; |
| 1627 | |
| 1628 | if ((r = ssh_get_authentication_socket(&agent_fd)) != 0) { |
| 1629 | if (r != SSH_ERR_AGENT_NOT_PRESENT-47) |
| 1630 | debug_fr(r, "ssh_get_authentication_socket")sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__, 1630, 1, SYSLOG_LEVEL_DEBUG1, ssh_err(r), "ssh_get_authentication_socket" ); |
| 1631 | return r; |
| 1632 | } |
| 1633 | if ((r = ssh_agent_bind_hostkey(agent_fd, ssh->kex->initial_hostkey, |
| 1634 | ssh->kex->session_id, ssh->kex->initial_sig, 0)) == 0) |
| 1635 | debug_f("bound agent to hostkey")sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__, 1635, 1, SYSLOG_LEVEL_DEBUG1, ((void *)0), "bound agent to hostkey" ); |
| 1636 | else |
| 1637 | debug2_fr(r, "ssh_agent_bind_hostkey")sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__, 1637, 1, SYSLOG_LEVEL_DEBUG2, ssh_err(r), "ssh_agent_bind_hostkey" ); |
| 1638 | |
| 1639 | if ((r = ssh_fetch_identitylist(agent_fd, &idlist)) != 0) { |
| 1640 | debug_fr(r, "ssh_fetch_identitylist")sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__, 1640, 1, SYSLOG_LEVEL_DEBUG1, ssh_err(r), "ssh_fetch_identitylist" ); |
| 1641 | close(agent_fd); |
| 1642 | return r; |
| 1643 | } |
| 1644 | /* success */ |
| 1645 | *agent_fdp = agent_fd; |
| 1646 | *idlistp = idlist; |
| 1647 | debug_f("agent returned %zu keys", idlist->nkeys)sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__, 1647, 1, SYSLOG_LEVEL_DEBUG1, ((void *)0), "agent returned %zu keys" , idlist->nkeys); |
| 1648 | return 0; |
| 1649 | } |
| 1650 | |
| 1651 | /* |
| 1652 | * try keys in the following order: |
| 1653 | * 1. certificates listed in the config file |
| 1654 | * 2. other input certificates |
| 1655 | * 3. agent keys that are found in the config file |
| 1656 | * 4. other agent keys |
| 1657 | * 5. keys that are only listed in the config file |
| 1658 | */ |
| 1659 | static void |
| 1660 | pubkey_prepare(struct ssh *ssh, Authctxt *authctxt) |
| 1661 | { |
| 1662 | struct identity *id, *id2, *tmp; |
| 1663 | struct idlist agent, files, *preferred; |
| 1664 | struct sshkey *key; |
| 1665 | int disallowed, agent_fd = -1, i, r, found; |
| 1666 | size_t j; |
| 1667 | struct ssh_identitylist *idlist; |
| 1668 | char *cp, *ident; |
| 1669 | |
| 1670 | TAILQ_INIT(&agent)do { (&agent)->tqh_first = ((void *)0); (&agent)-> tqh_last = &(&agent)->tqh_first; } while (0); /* keys from the agent */ |
| 1671 | TAILQ_INIT(&files)do { (&files)->tqh_first = ((void *)0); (&files)-> tqh_last = &(&files)->tqh_first; } while (0); /* keys from the config file */ |
| 1672 | preferred = &authctxt->keys; |
| 1673 | TAILQ_INIT(preferred)do { (preferred)->tqh_first = ((void *)0); (preferred)-> tqh_last = &(preferred)->tqh_first; } while (0); /* preferred order of keys */ |
| 1674 | |
| 1675 | /* list of keys stored in the filesystem and PKCS#11 */ |
| 1676 | for (i = 0; i < options.num_identity_files; i++) { |
| 1677 | key = options.identity_keys[i]; |
| 1678 | if (key && key->cert && |
| 1679 | key->cert->type != SSH2_CERT_TYPE_USER1) { |
| 1680 | debug_f("ignoring certificate %s: not a user "sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__, 1681, 1, SYSLOG_LEVEL_DEBUG1, ((void *)0), "ignoring certificate %s: not a user " "certificate", options.identity_files[i]) |
| 1681 | "certificate", options.identity_files[i])sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__, 1681, 1, SYSLOG_LEVEL_DEBUG1, ((void *)0), "ignoring certificate %s: not a user " "certificate", options.identity_files[i]); |
| 1682 | continue; |
| 1683 | } |
| 1684 | if (key && sshkey_is_sk(key) && options.sk_provider == NULL((void *)0)) { |
| 1685 | debug_f("ignoring authenticator-hosted key %s as no "sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__, 1687, 1, SYSLOG_LEVEL_DEBUG1, ((void *)0), "ignoring authenticator-hosted key %s as no " "SecurityKeyProvider has been specified", options.identity_files [i]) |
| 1686 | "SecurityKeyProvider has been specified",sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__, 1687, 1, SYSLOG_LEVEL_DEBUG1, ((void *)0), "ignoring authenticator-hosted key %s as no " "SecurityKeyProvider has been specified", options.identity_files [i]) |
| 1687 | options.identity_files[i])sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__, 1687, 1, SYSLOG_LEVEL_DEBUG1, ((void *)0), "ignoring authenticator-hosted key %s as no " "SecurityKeyProvider has been specified", options.identity_files [i]); |
| 1688 | continue; |
| 1689 | } |
| 1690 | options.identity_keys[i] = NULL((void *)0); |
| 1691 | id = xcalloc(1, sizeof(*id)); |
| 1692 | id->agent_fd = -1; |
| 1693 | id->key = key; |
| 1694 | id->filename = xstrdup(options.identity_files[i]); |
| 1695 | id->userprovided = options.identity_file_userprovided[i]; |
| 1696 | TAILQ_INSERT_TAIL(&files, id, next)do { (id)->next.tqe_next = ((void *)0); (id)->next.tqe_prev = (&files)->tqh_last; *(&files)->tqh_last = (id ); (&files)->tqh_last = &(id)->next.tqe_next; } while (0); |
| 1697 | } |
| 1698 | /* list of certificates specified by user */ |
| 1699 | for (i = 0; i < options.num_certificate_files; i++) { |
| 1700 | key = options.certificates[i]; |
| 1701 | if (!sshkey_is_cert(key) || key->cert == NULL((void *)0) || |
| 1702 | key->cert->type != SSH2_CERT_TYPE_USER1) { |
| 1703 | debug_f("ignoring certificate %s: not a user "sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__, 1704, 1, SYSLOG_LEVEL_DEBUG1, ((void *)0), "ignoring certificate %s: not a user " "certificate", options.identity_files[i]) |
| 1704 | "certificate", options.identity_files[i])sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__, 1704, 1, SYSLOG_LEVEL_DEBUG1, ((void *)0), "ignoring certificate %s: not a user " "certificate", options.identity_files[i]); |
| 1705 | continue; |
| 1706 | } |
| 1707 | if (key && sshkey_is_sk(key) && options.sk_provider == NULL((void *)0)) { |
| 1708 | debug_f("ignoring authenticator-hosted key "sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__, 1711, 1, SYSLOG_LEVEL_DEBUG1, ((void *)0), "ignoring authenticator-hosted key " "certificate %s as no " "SecurityKeyProvider has been specified" , options.identity_files[i]) |
| 1709 | "certificate %s as no "sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__, 1711, 1, SYSLOG_LEVEL_DEBUG1, ((void *)0), "ignoring authenticator-hosted key " "certificate %s as no " "SecurityKeyProvider has been specified" , options.identity_files[i]) |
| 1710 | "SecurityKeyProvider has been specified",sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__, 1711, 1, SYSLOG_LEVEL_DEBUG1, ((void *)0), "ignoring authenticator-hosted key " "certificate %s as no " "SecurityKeyProvider has been specified" , options.identity_files[i]) |
| 1711 | options.identity_files[i])sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__, 1711, 1, SYSLOG_LEVEL_DEBUG1, ((void *)0), "ignoring authenticator-hosted key " "certificate %s as no " "SecurityKeyProvider has been specified" , options.identity_files[i]); |
| 1712 | continue; |
| 1713 | } |
| 1714 | id = xcalloc(1, sizeof(*id)); |
| 1715 | id->agent_fd = -1; |
| 1716 | id->key = key; |
| 1717 | id->filename = xstrdup(options.certificate_files[i]); |
| 1718 | id->userprovided = options.certificate_file_userprovided[i]; |
| 1719 | TAILQ_INSERT_TAIL(preferred, id, next)do { (id)->next.tqe_next = ((void *)0); (id)->next.tqe_prev = (preferred)->tqh_last; *(preferred)->tqh_last = (id) ; (preferred)->tqh_last = &(id)->next.tqe_next; } while (0); |
| 1720 | } |
| 1721 | /* list of keys supported by the agent */ |
| 1722 | if ((r = get_agent_identities(ssh, &agent_fd, &idlist)) == 0) { |
| 1723 | for (j = 0; j < idlist->nkeys; j++) { |
| 1724 | if ((r = sshkey_check_rsa_length(idlist->keys[j], |
| 1725 | options.required_rsa_size)) != 0) { |
| 1726 | debug_fr(r, "ignoring %s agent key",sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__, 1727, 1, SYSLOG_LEVEL_DEBUG1, ssh_err(r), "ignoring %s agent key" , sshkey_ssh_name(idlist->keys[j])) |
| 1727 | sshkey_ssh_name(idlist->keys[j]))sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__, 1727, 1, SYSLOG_LEVEL_DEBUG1, ssh_err(r), "ignoring %s agent key" , sshkey_ssh_name(idlist->keys[j])); |
| 1728 | continue; |
| 1729 | } |
| 1730 | found = 0; |
| 1731 | TAILQ_FOREACH(id, &files, next)for((id) = ((&files)->tqh_first); (id) != ((void *)0); (id) = ((id)->next.tqe_next)) { |
| 1732 | /* |
| 1733 | * agent keys from the config file are |
| 1734 | * preferred |
| 1735 | */ |
| 1736 | if (sshkey_equal(idlist->keys[j], id->key)) { |
| 1737 | TAILQ_REMOVE(&files, id, next)do { if (((id)->next.tqe_next) != ((void *)0)) (id)->next .tqe_next->next.tqe_prev = (id)->next.tqe_prev; else (& files)->tqh_last = (id)->next.tqe_prev; *(id)->next. tqe_prev = (id)->next.tqe_next; ; ; } while (0); |
| 1738 | TAILQ_INSERT_TAIL(preferred, id, next)do { (id)->next.tqe_next = ((void *)0); (id)->next.tqe_prev = (preferred)->tqh_last; *(preferred)->tqh_last = (id) ; (preferred)->tqh_last = &(id)->next.tqe_next; } while (0); |
| 1739 | id->agent_fd = agent_fd; |
| 1740 | found = 1; |
| 1741 | break; |
| 1742 | } |
| 1743 | } |
| 1744 | if (!found && !options.identities_only) { |
| 1745 | id = xcalloc(1, sizeof(*id)); |
| 1746 | /* XXX "steals" key/comment from idlist */ |
| 1747 | id->key = idlist->keys[j]; |
| 1748 | id->filename = idlist->comments[j]; |
| 1749 | idlist->keys[j] = NULL((void *)0); |
| 1750 | idlist->comments[j] = NULL((void *)0); |
| 1751 | id->agent_fd = agent_fd; |
| 1752 | TAILQ_INSERT_TAIL(&agent, id, next)do { (id)->next.tqe_next = ((void *)0); (id)->next.tqe_prev = (&agent)->tqh_last; *(&agent)->tqh_last = (id ); (&agent)->tqh_last = &(id)->next.tqe_next; } while (0); |
| 1753 | } |
| 1754 | } |
| 1755 | ssh_free_identitylist(idlist); |
| 1756 | /* append remaining agent keys */ |
| 1757 | TAILQ_CONCAT(preferred, &agent, next)do { if (!(((&agent)->tqh_first) == ((void *)0))) { *( preferred)->tqh_last = (&agent)->tqh_first; (&agent )->tqh_first->next.tqe_prev = (preferred)->tqh_last; (preferred)->tqh_last = (&agent)->tqh_last; do { ( (&agent))->tqh_first = ((void *)0); ((&agent))-> tqh_last = &((&agent))->tqh_first; } while (0); } } while (0); |
| 1758 | authctxt->agent_fd = agent_fd; |
| 1759 | } |
| 1760 | /* Prefer PKCS11 keys that are explicitly listed */ |
| 1761 | TAILQ_FOREACH_SAFE(id, &files, next, tmp)for ((id) = ((&files)->tqh_first); (id) != ((void *)0) && ((tmp) = ((id)->next.tqe_next), 1); (id) = (tmp )) { |
| 1762 | if (id->key == NULL((void *)0) || (id->key->flags & SSHKEY_FLAG_EXT0x0001) == 0) |
| 1763 | continue; |
| 1764 | found = 0; |
| 1765 | TAILQ_FOREACH(id2, &files, next)for((id2) = ((&files)->tqh_first); (id2) != ((void *)0 ); (id2) = ((id2)->next.tqe_next)) { |
| 1766 | if (id2->key == NULL((void *)0) || |
| 1767 | (id2->key->flags & SSHKEY_FLAG_EXT0x0001) != 0) |
| 1768 | continue; |
| 1769 | if (sshkey_equal(id->key, id2->key)) { |
| 1770 | TAILQ_REMOVE(&files, id, next)do { if (((id)->next.tqe_next) != ((void *)0)) (id)->next .tqe_next->next.tqe_prev = (id)->next.tqe_prev; else (& files)->tqh_last = (id)->next.tqe_prev; *(id)->next. tqe_prev = (id)->next.tqe_next; ; ; } while (0); |
| 1771 | TAILQ_INSERT_TAIL(preferred, id, next)do { (id)->next.tqe_next = ((void *)0); (id)->next.tqe_prev = (preferred)->tqh_last; *(preferred)->tqh_last = (id) ; (preferred)->tqh_last = &(id)->next.tqe_next; } while (0); |
| 1772 | found = 1; |
| 1773 | break; |
| 1774 | } |
| 1775 | } |
| 1776 | /* If IdentitiesOnly set and key not found then don't use it */ |
| 1777 | if (!found && options.identities_only) { |
| 1778 | TAILQ_REMOVE(&files, id, next)do { if (((id)->next.tqe_next) != ((void *)0)) (id)->next .tqe_next->next.tqe_prev = (id)->next.tqe_prev; else (& files)->tqh_last = (id)->next.tqe_prev; *(id)->next. tqe_prev = (id)->next.tqe_next; ; ; } while (0); |
| 1779 | freezero(id, sizeof(*id)); |
| 1780 | } |
| 1781 | } |
| 1782 | /* append remaining keys from the config file */ |
| 1783 | TAILQ_CONCAT(preferred, &files, next)do { if (!(((&files)->tqh_first) == ((void *)0))) { *( preferred)->tqh_last = (&files)->tqh_first; (&files )->tqh_first->next.tqe_prev = (preferred)->tqh_last; (preferred)->tqh_last = (&files)->tqh_last; do { ( (&files))->tqh_first = ((void *)0); ((&files))-> tqh_last = &((&files))->tqh_first; } while (0); } } while (0); |
| 1784 | /* finally, filter by PubkeyAcceptedAlgorithms */ |
| 1785 | TAILQ_FOREACH_SAFE(id, preferred, next, id2)for ((id) = ((preferred)->tqh_first); (id) != ((void *)0) && ((id2) = ((id)->next.tqe_next), 1); (id) = (id2)) { |
| 1786 | disallowed = 0; |
| 1787 | cp = NULL((void *)0); |
| 1788 | if (id->key == NULL((void *)0)) |
| 1789 | continue; |
| 1790 | if (!key_type_allowed_by_config(id->key)) { |
| 1791 | debug("Skipping %s key %s - corresponding algorithm "sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__, 1793, 0, SYSLOG_LEVEL_DEBUG1, ((void *)0), "Skipping %s key %s - corresponding algorithm " "not in PubkeyAcceptedAlgorithms", sshkey_ssh_name(id->key ), id->filename) |
| 1792 | "not in PubkeyAcceptedAlgorithms",sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__, 1793, 0, SYSLOG_LEVEL_DEBUG1, ((void *)0), "Skipping %s key %s - corresponding algorithm " "not in PubkeyAcceptedAlgorithms", sshkey_ssh_name(id->key ), id->filename) |
| 1793 | sshkey_ssh_name(id->key), id->filename)sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__, 1793, 0, SYSLOG_LEVEL_DEBUG1, ((void *)0), "Skipping %s key %s - corresponding algorithm " "not in PubkeyAcceptedAlgorithms", sshkey_ssh_name(id->key ), id->filename); |
| 1794 | disallowed = 1; |
| 1795 | } else if (ssh->kex->server_sig_algs != NULL((void *)0) && |
| 1796 | (cp = key_sig_algorithm(ssh, id->key)) == NULL((void *)0)) { |
| 1797 | debug("Skipping %s key %s - corresponding algorithm "sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__, 1799, 0, SYSLOG_LEVEL_DEBUG1, ((void *)0), "Skipping %s key %s - corresponding algorithm " "not supported by server", sshkey_ssh_name(id->key), id-> filename) |
| 1798 | "not supported by server",sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__, 1799, 0, SYSLOG_LEVEL_DEBUG1, ((void *)0), "Skipping %s key %s - corresponding algorithm " "not supported by server", sshkey_ssh_name(id->key), id-> filename) |
| 1799 | sshkey_ssh_name(id->key), id->filename)sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__, 1799, 0, SYSLOG_LEVEL_DEBUG1, ((void *)0), "Skipping %s key %s - corresponding algorithm " "not supported by server", sshkey_ssh_name(id->key), id-> filename); |
| 1800 | disallowed = 1; |
| 1801 | } |
| 1802 | free(cp); |
| 1803 | if (!disallowed) |
| 1804 | continue; |
| 1805 | /* remove key */ |
| 1806 | TAILQ_REMOVE(preferred, id, next)do { if (((id)->next.tqe_next) != ((void *)0)) (id)->next .tqe_next->next.tqe_prev = (id)->next.tqe_prev; else (preferred )->tqh_last = (id)->next.tqe_prev; *(id)->next.tqe_prev = (id)->next.tqe_next; ; ; } while (0); |
| 1807 | sshkey_free(id->key); |
| 1808 | free(id->filename); |
| 1809 | memset(id, 0, sizeof(*id)); |
| 1810 | } |
| 1811 | /* List the keys we plan on using */ |
| 1812 | TAILQ_FOREACH_SAFE(id, preferred, next, id2)for ((id) = ((preferred)->tqh_first); (id) != ((void *)0) && ((id2) = ((id)->next.tqe_next), 1); (id) = (id2)) { |
| 1813 | ident = format_identity(id); |
| 1814 | debug("Will attempt key: %s", ident)sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__, 1814, 0, SYSLOG_LEVEL_DEBUG1, ((void *)0), "Will attempt key: %s" , ident); |
| 1815 | free(ident); |
| 1816 | } |
| 1817 | debug2_f("done")sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__, 1817, 1, SYSLOG_LEVEL_DEBUG2, ((void *)0), "done"); |
| 1818 | } |
| 1819 | |
| 1820 | static void |
| 1821 | pubkey_cleanup(struct ssh *ssh) |
| 1822 | { |
| 1823 | Authctxt *authctxt = (Authctxt *)ssh->authctxt; |
| 1824 | Identity *id; |
| 1825 | |
| 1826 | if (authctxt->agent_fd != -1) { |
| 1827 | ssh_close_authentication_socket(authctxt->agent_fd); |
| 1828 | authctxt->agent_fd = -1; |
| 1829 | } |
| 1830 | for (id = TAILQ_FIRST(&authctxt->keys)((&authctxt->keys)->tqh_first); id; |
| 1831 | id = TAILQ_FIRST(&authctxt->keys)((&authctxt->keys)->tqh_first)) { |
| 1832 | TAILQ_REMOVE(&authctxt->keys, id, next)do { if (((id)->next.tqe_next) != ((void *)0)) (id)->next .tqe_next->next.tqe_prev = (id)->next.tqe_prev; else (& authctxt->keys)->tqh_last = (id)->next.tqe_prev; *(id )->next.tqe_prev = (id)->next.tqe_next; ; ; } while (0); |
| 1833 | sshkey_free(id->key); |
| 1834 | free(id->filename); |
| 1835 | free(id); |
| 1836 | } |
| 1837 | } |
| 1838 | |
| 1839 | static void |
| 1840 | pubkey_reset(Authctxt *authctxt) |
| 1841 | { |
| 1842 | Identity *id; |
| 1843 | |
| 1844 | TAILQ_FOREACH(id, &authctxt->keys, next)for((id) = ((&authctxt->keys)->tqh_first); (id) != ( (void *)0); (id) = ((id)->next.tqe_next)) |
| 1845 | id->tried = 0; |
| 1846 | } |
| 1847 | |
| 1848 | static int |
| 1849 | userauth_pubkey(struct ssh *ssh) |
| 1850 | { |
| 1851 | Authctxt *authctxt = (Authctxt *)ssh->authctxt; |
| 1852 | Identity *id; |
| 1853 | int sent = 0; |
| 1854 | char *ident; |
| 1855 | static int prepared; |
| 1856 | |
| 1857 | if (!prepared) { |
| 1858 | pubkey_prepare(ssh, authctxt); |
| 1859 | prepared = 1; |
| 1860 | } |
| 1861 | |
| 1862 | while ((id = TAILQ_FIRST(&authctxt->keys)((&authctxt->keys)->tqh_first))) { |
| 1863 | if (id->tried++) |
| 1864 | return (0); |
| 1865 | /* move key to the end of the queue */ |
| 1866 | TAILQ_REMOVE(&authctxt->keys, id, next)do { if (((id)->next.tqe_next) != ((void *)0)) (id)->next .tqe_next->next.tqe_prev = (id)->next.tqe_prev; else (& authctxt->keys)->tqh_last = (id)->next.tqe_prev; *(id )->next.tqe_prev = (id)->next.tqe_next; ; ; } while (0); |
| 1867 | TAILQ_INSERT_TAIL(&authctxt->keys, id, next)do { (id)->next.tqe_next = ((void *)0); (id)->next.tqe_prev = (&authctxt->keys)->tqh_last; *(&authctxt-> keys)->tqh_last = (id); (&authctxt->keys)->tqh_last = &(id)->next.tqe_next; } while (0); |
| 1868 | /* |
| 1869 | * send a test message if we have the public key. for |
| 1870 | * encrypted keys we cannot do this and have to load the |
| 1871 | * private key instead |
| 1872 | */ |
| 1873 | if (id->key != NULL((void *)0)) { |
| 1874 | ident = format_identity(id); |
| 1875 | debug("Offering public key: %s", ident)sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__, 1875, 0, SYSLOG_LEVEL_DEBUG1, ((void *)0), "Offering public key: %s" , ident); |
| 1876 | free(ident); |
| 1877 | sent = send_pubkey_test(ssh, id); |
| 1878 | } else { |
| 1879 | debug("Trying private key: %s", id->filename)sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__, 1879, 0, SYSLOG_LEVEL_DEBUG1, ((void *)0), "Trying private key: %s" , id->filename); |
| 1880 | id->key = load_identity_file(id); |
| 1881 | if (id->key != NULL((void *)0)) { |
| 1882 | if (id->key != NULL((void *)0)) { |
| 1883 | id->isprivate = 1; |
| 1884 | sent = sign_and_send_pubkey(ssh, id); |
| 1885 | } |
| 1886 | sshkey_free(id->key); |
| 1887 | id->key = NULL((void *)0); |
| 1888 | id->isprivate = 0; |
| 1889 | } |
| 1890 | } |
| 1891 | if (sent) |
| 1892 | return (sent); |
| 1893 | } |
| 1894 | return (0); |
| 1895 | } |
| 1896 | |
| 1897 | /* |
| 1898 | * Send userauth request message specifying keyboard-interactive method. |
| 1899 | */ |
| 1900 | static int |
| 1901 | userauth_kbdint(struct ssh *ssh) |
| 1902 | { |
| 1903 | Authctxt *authctxt = (Authctxt *)ssh->authctxt; |
| 1904 | int r; |
| 1905 | |
| 1906 | if (authctxt->attempt_kbdint++ >= options.number_of_password_prompts) |
| 1907 | return 0; |
| 1908 | /* disable if no SSH2_MSG_USERAUTH_INFO_REQUEST has been seen */ |
| 1909 | if (authctxt->attempt_kbdint > 1 && !authctxt->info_req_seen) { |
| 1910 | debug3("userauth_kbdint: disable: no info_req_seen")sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__, 1910, 0, SYSLOG_LEVEL_DEBUG3, ((void *)0), "userauth_kbdint: disable: no info_req_seen" ); |
| 1911 | ssh_dispatch_set(ssh, SSH2_MSG_USERAUTH_INFO_REQUEST60, NULL((void *)0)); |
| 1912 | return 0; |
| 1913 | } |
| 1914 | |
| 1915 | debug2("userauth_kbdint")sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__, 1915, 0, SYSLOG_LEVEL_DEBUG2, ((void *)0), "userauth_kbdint" ); |
| 1916 | if ((r = sshpkt_start(ssh, SSH2_MSG_USERAUTH_REQUEST50)) != 0 || |
| 1917 | (r = sshpkt_put_cstring(ssh, authctxt->server_user)) != 0 || |
| 1918 | (r = sshpkt_put_cstring(ssh, authctxt->service)) != 0 || |
| 1919 | (r = sshpkt_put_cstring(ssh, authctxt->method->name)) != 0 || |
| 1920 | (r = sshpkt_put_cstring(ssh, "")) != 0 || /* lang */ |
| 1921 | (r = sshpkt_put_cstring(ssh, options.kbd_interactive_devices ? |
| 1922 | options.kbd_interactive_devices : "")) != 0 || |
| 1923 | (r = sshpkt_send(ssh)) != 0) |
| 1924 | fatal_fr(r, "send packet")sshfatal("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__ , 1924, 1, SYSLOG_LEVEL_FATAL, ssh_err(r), "send packet"); |
| 1925 | |
| 1926 | ssh_dispatch_set(ssh, SSH2_MSG_USERAUTH_INFO_REQUEST60, &input_userauth_info_req); |
| 1927 | return 1; |
| 1928 | } |
| 1929 | |
| 1930 | /* |
| 1931 | * parse INFO_REQUEST, prompt user and send INFO_RESPONSE |
| 1932 | */ |
| 1933 | static int |
| 1934 | input_userauth_info_req(int type, u_int32_t seq, struct ssh *ssh) |
| 1935 | { |
| 1936 | Authctxt *authctxt = ssh->authctxt; |
| 1937 | char *name = NULL((void *)0), *inst = NULL((void *)0), *lang = NULL((void *)0), *prompt = NULL((void *)0); |
| 1938 | char *display_prompt = NULL((void *)0), *response = NULL((void *)0); |
| 1939 | u_char echo = 0; |
| 1940 | u_int num_prompts, i; |
| 1941 | int r; |
| 1942 | |
| 1943 | debug2_f("entering")sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__, 1943, 1, SYSLOG_LEVEL_DEBUG2, ((void *)0), "entering"); |
| 1944 | |
| 1945 | if (authctxt == NULL((void *)0)) |
| 1946 | fatal_f("no authentication context")sshfatal("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__ , 1946, 1, SYSLOG_LEVEL_FATAL, ((void *)0), "no authentication context" ); |
| 1947 | |
| 1948 | authctxt->info_req_seen = 1; |
| 1949 | |
| 1950 | if ((r = sshpkt_get_cstring(ssh, &name, NULL((void *)0))) != 0 || |
| 1951 | (r = sshpkt_get_cstring(ssh, &inst, NULL((void *)0))) != 0 || |
| 1952 | (r = sshpkt_get_cstring(ssh, &lang, NULL((void *)0))) != 0) |
| 1953 | goto out; |
| 1954 | if (strlen(name) > 0) |
| 1955 | logit("%s", name)sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__, 1955, 0, SYSLOG_LEVEL_INFO, ((void *)0), "%s", name); |
| 1956 | if (strlen(inst) > 0) |
| 1957 | logit("%s", inst)sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__, 1957, 0, SYSLOG_LEVEL_INFO, ((void *)0), "%s", inst); |
| 1958 | |
| 1959 | if ((r = sshpkt_get_u32(ssh, &num_prompts)) != 0) |
| 1960 | goto out; |
| 1961 | /* |
| 1962 | * Begin to build info response packet based on prompts requested. |
| 1963 | * We commit to providing the correct number of responses, so if |
| 1964 | * further on we run into a problem that prevents this, we have to |
| 1965 | * be sure and clean this up and send a correct error response. |
| 1966 | */ |
| 1967 | if ((r = sshpkt_start(ssh, SSH2_MSG_USERAUTH_INFO_RESPONSE61)) != 0 || |
| 1968 | (r = sshpkt_put_u32(ssh, num_prompts)) != 0) |
| 1969 | goto out; |
| 1970 | |
| 1971 | debug2_f("num_prompts %d", num_prompts)sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__, 1971, 1, SYSLOG_LEVEL_DEBUG2, ((void *)0), "num_prompts %d", num_prompts); |
| 1972 | for (i = 0; i < num_prompts; i++) { |
| 1973 | if ((r = sshpkt_get_cstring(ssh, &prompt, NULL((void *)0))) != 0 || |
| 1974 | (r = sshpkt_get_u8(ssh, &echo)) != 0) |
| 1975 | goto out; |
| 1976 | if (asmprintf(&display_prompt, INT_MAX0x7fffffff, NULL((void *)0), "(%s@%s) %s", |
| 1977 | authctxt->server_user, options.host_key_alias ? |
| 1978 | options.host_key_alias : authctxt->host, prompt) == -1) |
| 1979 | fatal_f("asmprintf failed")sshfatal("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__ , 1979, 1, SYSLOG_LEVEL_FATAL, ((void *)0), "asmprintf failed" ); |
| 1980 | response = read_passphrase(display_prompt, echo ? RP_ECHO0x0001 : 0); |
| 1981 | if ((r = sshpkt_put_cstring(ssh, response)) != 0) |
| 1982 | goto out; |
| 1983 | freezero(response, strlen(response)); |
| 1984 | free(prompt); |
| 1985 | free(display_prompt); |
| 1986 | display_prompt = response = prompt = NULL((void *)0); |
| 1987 | } |
| 1988 | /* done with parsing incoming message. */ |
| 1989 | if ((r = sshpkt_get_end(ssh)) != 0 || |
| 1990 | (r = sshpkt_add_padding(ssh, 64)) != 0) |
| 1991 | goto out; |
| 1992 | r = sshpkt_send(ssh); |
| 1993 | out: |
| 1994 | if (response) |
| 1995 | freezero(response, strlen(response)); |
| 1996 | free(prompt); |
| 1997 | free(display_prompt); |
| 1998 | free(name); |
| 1999 | free(inst); |
| 2000 | free(lang); |
| 2001 | return r; |
| 2002 | } |
| 2003 | |
| 2004 | static int |
| 2005 | ssh_keysign(struct ssh *ssh, struct sshkey *key, u_char **sigp, size_t *lenp, |
| 2006 | const u_char *data, size_t datalen) |
| 2007 | { |
| 2008 | struct sshbuf *b; |
| 2009 | struct stat st; |
| 2010 | pid_t pid; |
| 2011 | int r, to[2], from[2], status; |
| 2012 | int sock = ssh_packet_get_connection_in(ssh); |
| 2013 | u_char rversion = 0, version = 2; |
| 2014 | void (*osigchld)(int); |
| 2015 | |
| 2016 | *sigp = NULL((void *)0); |
| 2017 | *lenp = 0; |
| 2018 | |
| 2019 | if (stat(_PATH_SSH_KEY_SIGN"/usr/libexec/ssh-keysign", &st) == -1) { |
| 2020 | error_f("not installed: %s", strerror(errno))sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__, 2020, 1, SYSLOG_LEVEL_ERROR, ((void *)0), "not installed: %s" , strerror((*__errno()))); |
| 2021 | return -1; |
| 2022 | } |
| 2023 | if (fflush(stdout(&__sF[1])) != 0) { |
| 2024 | error_f("fflush: %s", strerror(errno))sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__, 2024, 1, SYSLOG_LEVEL_ERROR, ((void *)0), "fflush: %s", strerror ((*__errno()))); |
| 2025 | return -1; |
| 2026 | } |
| 2027 | if (pipe(to) == -1) { |
| 2028 | error_f("pipe: %s", strerror(errno))sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__, 2028, 1, SYSLOG_LEVEL_ERROR, ((void *)0), "pipe: %s", strerror ((*__errno()))); |
| 2029 | return -1; |
| 2030 | } |
| 2031 | if (pipe(from) == -1) { |
| 2032 | error_f("pipe: %s", strerror(errno))sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__, 2032, 1, SYSLOG_LEVEL_ERROR, ((void *)0), "pipe: %s", strerror ((*__errno()))); |
| 2033 | return -1; |
| 2034 | } |
| 2035 | if ((pid = fork()) == -1) { |
| 2036 | error_f("fork: %s", strerror(errno))sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__, 2036, 1, SYSLOG_LEVEL_ERROR, ((void *)0), "fork: %s", strerror ((*__errno()))); |
| 2037 | return -1; |
| 2038 | } |
| 2039 | osigchld = ssh_signal(SIGCHLD20, SIG_DFL(void (*)(int))0); |
| 2040 | if (pid == 0) { |
| 2041 | close(from[0]); |
| 2042 | if (dup2(from[1], STDOUT_FILENO1) == -1) |
| 2043 | fatal_f("dup2: %s", strerror(errno))sshfatal("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__ , 2043, 1, SYSLOG_LEVEL_FATAL, ((void *)0), "dup2: %s", strerror ((*__errno()))); |
| 2044 | close(to[1]); |
| 2045 | if (dup2(to[0], STDIN_FILENO0) == -1) |
| 2046 | fatal_f("dup2: %s", strerror(errno))sshfatal("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__ , 2046, 1, SYSLOG_LEVEL_FATAL, ((void *)0), "dup2: %s", strerror ((*__errno()))); |
| 2047 | close(from[1]); |
| 2048 | close(to[0]); |
| 2049 | |
| 2050 | if (dup2(sock, STDERR_FILENO2 + 1) == -1) |
| 2051 | fatal_f("dup2: %s", strerror(errno))sshfatal("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__ , 2051, 1, SYSLOG_LEVEL_FATAL, ((void *)0), "dup2: %s", strerror ((*__errno()))); |
| 2052 | sock = STDERR_FILENO2 + 1; |
| 2053 | if (fcntl(sock, F_SETFD2, 0) == -1) /* keep the socket on exec */ |
| 2054 | debug3_f("fcntl F_SETFD: %s", strerror(errno))sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__, 2054, 1, SYSLOG_LEVEL_DEBUG3, ((void *)0), "fcntl F_SETFD: %s" , strerror((*__errno()))); |
| 2055 | closefrom(sock + 1); |
| 2056 | |
| 2057 | debug3_f("[child] pid=%ld, exec %s",sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__, 2058, 1, SYSLOG_LEVEL_DEBUG3, ((void *)0), "[child] pid=%ld, exec %s" , (long)getpid(), "/usr/libexec/ssh-keysign") |
| 2058 | (long)getpid(), _PATH_SSH_KEY_SIGN)sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__, 2058, 1, SYSLOG_LEVEL_DEBUG3, ((void *)0), "[child] pid=%ld, exec %s" , (long)getpid(), "/usr/libexec/ssh-keysign"); |
| 2059 | execl(_PATH_SSH_KEY_SIGN"/usr/libexec/ssh-keysign", _PATH_SSH_KEY_SIGN"/usr/libexec/ssh-keysign", (char *)NULL((void *)0)); |
| 2060 | fatal_f("exec(%s): %s", _PATH_SSH_KEY_SIGN,sshfatal("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__ , 2061, 1, SYSLOG_LEVEL_FATAL, ((void *)0), "exec(%s): %s", "/usr/libexec/ssh-keysign" , strerror((*__errno()))) |
| 2061 | strerror(errno))sshfatal("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__ , 2061, 1, SYSLOG_LEVEL_FATAL, ((void *)0), "exec(%s): %s", "/usr/libexec/ssh-keysign" , strerror((*__errno()))); |
| 2062 | } |
| 2063 | close(from[1]); |
| 2064 | close(to[0]); |
| 2065 | sock = STDERR_FILENO2 + 1; |
| 2066 | |
| 2067 | if ((b = sshbuf_new()) == NULL((void *)0)) |
| 2068 | fatal_f("sshbuf_new failed")sshfatal("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__ , 2068, 1, SYSLOG_LEVEL_FATAL, ((void *)0), "sshbuf_new failed" ); |
| 2069 | /* send # of sock, data to be signed */ |
| 2070 | if ((r = sshbuf_put_u32(b, sock)) != 0 || |
| 2071 | (r = sshbuf_put_string(b, data, datalen)) != 0) |
| 2072 | fatal_fr(r, "buffer error")sshfatal("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__ , 2072, 1, SYSLOG_LEVEL_FATAL, ssh_err(r), "buffer error"); |
| 2073 | if (ssh_msg_send(to[1], version, b) == -1) |
| 2074 | fatal_f("couldn't send request")sshfatal("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__ , 2074, 1, SYSLOG_LEVEL_FATAL, ((void *)0), "couldn't send request" ); |
| 2075 | sshbuf_reset(b); |
| 2076 | r = ssh_msg_recv(from[0], b); |
| 2077 | close(from[0]); |
| 2078 | close(to[1]); |
| 2079 | if (r < 0) { |
| 2080 | error_f("no reply")sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__, 2080, 1, SYSLOG_LEVEL_ERROR, ((void *)0), "no reply"); |
| 2081 | goto fail; |
| 2082 | } |
| 2083 | |
| 2084 | errno(*__errno()) = 0; |
| 2085 | while (waitpid(pid, &status, 0) == -1) { |
| 2086 | if (errno(*__errno()) != EINTR4) { |
| 2087 | error_f("waitpid %ld: %s", (long)pid, strerror(errno))sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__, 2087, 1, SYSLOG_LEVEL_ERROR, ((void *)0), "waitpid %ld: %s", (long)pid, strerror((*__errno()))); |
| 2088 | goto fail; |
| 2089 | } |
| 2090 | } |
| 2091 | if (!WIFEXITED(status)(((status) & 0177) == 0)) { |
| 2092 | error_f("exited abnormally")sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__, 2092, 1, SYSLOG_LEVEL_ERROR, ((void *)0), "exited abnormally" ); |
| 2093 | goto fail; |
| 2094 | } |
| 2095 | if (WEXITSTATUS(status)(int)(((unsigned)(status) >> 8) & 0xff) != 0) { |
| 2096 | error_f("exited with status %d", WEXITSTATUS(status))sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__, 2096, 1, SYSLOG_LEVEL_ERROR, ((void *)0), "exited with status %d" , (int)(((unsigned)(status) >> 8) & 0xff)); |
| 2097 | goto fail; |
| 2098 | } |
| 2099 | if ((r = sshbuf_get_u8(b, &rversion)) != 0) { |
| 2100 | error_fr(r, "buffer error")sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__, 2100, 1, SYSLOG_LEVEL_ERROR, ssh_err(r), "buffer error"); |
| 2101 | goto fail; |
| 2102 | } |
| 2103 | if (rversion != version) { |
| 2104 | error_f("bad version")sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__, 2104, 1, SYSLOG_LEVEL_ERROR, ((void *)0), "bad version"); |
| 2105 | goto fail; |
| 2106 | } |
| 2107 | if ((r = sshbuf_get_string(b, sigp, lenp)) != 0) { |
| 2108 | error_fr(r, "buffer error")sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__, 2108, 1, SYSLOG_LEVEL_ERROR, ssh_err(r), "buffer error"); |
| 2109 | fail: |
| 2110 | ssh_signal(SIGCHLD20, osigchld); |
| 2111 | sshbuf_free(b); |
| 2112 | return -1; |
| 2113 | } |
| 2114 | ssh_signal(SIGCHLD20, osigchld); |
| 2115 | sshbuf_free(b); |
| 2116 | |
| 2117 | return 0; |
| 2118 | } |
| 2119 | |
| 2120 | static int |
| 2121 | userauth_hostbased(struct ssh *ssh) |
| 2122 | { |
| 2123 | Authctxt *authctxt = (Authctxt *)ssh->authctxt; |
| 2124 | struct sshkey *private = NULL((void *)0); |
| 2125 | struct sshbuf *b = NULL((void *)0); |
| 2126 | u_char *sig = NULL((void *)0), *keyblob = NULL((void *)0); |
| 2127 | char *fp = NULL((void *)0), *chost = NULL((void *)0), *lname = NULL((void *)0); |
| 2128 | size_t siglen = 0, keylen = 0; |
| 2129 | int i, r, success = 0; |
| 2130 | |
| 2131 | if (authctxt->ktypes == NULL((void *)0)) { |
| 2132 | authctxt->oktypes = xstrdup(options.hostbased_accepted_algos); |
| 2133 | authctxt->ktypes = authctxt->oktypes; |
| 2134 | } |
| 2135 | |
| 2136 | /* |
| 2137 | * Work through each listed type pattern in HostbasedAcceptedAlgorithms, |
| 2138 | * trying each hostkey that matches the type in turn. |
| 2139 | */ |
| 2140 | for (;;) { |
| 2141 | if (authctxt->active_ktype == NULL((void *)0)) |
| 2142 | authctxt->active_ktype = strsep(&authctxt->ktypes, ","); |
| 2143 | if (authctxt->active_ktype == NULL((void *)0) || |
| 2144 | *authctxt->active_ktype == '\0') |
| 2145 | break; |
| 2146 | debug3_f("trying key type %s", authctxt->active_ktype)sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__, 2146, 1, SYSLOG_LEVEL_DEBUG3, ((void *)0), "trying key type %s" , authctxt->active_ktype); |
| 2147 | |
| 2148 | /* check for a useful key */ |
| 2149 | private = NULL((void *)0); |
| 2150 | for (i = 0; i < authctxt->sensitive->nkeys; i++) { |
| 2151 | if (authctxt->sensitive->keys[i] == NULL((void *)0) || |
| 2152 | authctxt->sensitive->keys[i]->type == KEY_UNSPEC) |
| 2153 | continue; |
| 2154 | if (!sshkey_match_keyname_to_sigalgs( |
| 2155 | sshkey_ssh_name(authctxt->sensitive->keys[i]), |
| 2156 | authctxt->active_ktype)) |
| 2157 | continue; |
| 2158 | /* we take and free the key */ |
| 2159 | private = authctxt->sensitive->keys[i]; |
| 2160 | authctxt->sensitive->keys[i] = NULL((void *)0); |
| 2161 | break; |
| 2162 | } |
| 2163 | /* Found one */ |
| 2164 | if (private != NULL((void *)0)) |
| 2165 | break; |
| 2166 | /* No more keys of this type; advance */ |
| 2167 | authctxt->active_ktype = NULL((void *)0); |
| 2168 | } |
| 2169 | if (private == NULL((void *)0)) { |
| 2170 | free(authctxt->oktypes); |
| 2171 | authctxt->oktypes = authctxt->ktypes = NULL((void *)0); |
| 2172 | authctxt->active_ktype = NULL((void *)0); |
| 2173 | debug("No more client hostkeys for hostbased authentication.")sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__, 2173, 0, SYSLOG_LEVEL_DEBUG1, ((void *)0), "No more client hostkeys for hostbased authentication." ); |
| 2174 | goto out; |
| 2175 | } |
| 2176 | |
| 2177 | if ((fp = sshkey_fingerprint(private, options.fingerprint_hash, |
| 2178 | SSH_FP_DEFAULT)) == NULL((void *)0)) { |
| 2179 | error_f("sshkey_fingerprint failed")sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__, 2179, 1, SYSLOG_LEVEL_ERROR, ((void *)0), "sshkey_fingerprint failed" ); |
| 2180 | goto out; |
| 2181 | } |
| 2182 | debug_f("trying hostkey %s %s using sigalg %s",sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__, 2183, 1, SYSLOG_LEVEL_DEBUG1, ((void *)0), "trying hostkey %s %s using sigalg %s" , sshkey_ssh_name(private), fp, authctxt->active_ktype) |
| 2183 | sshkey_ssh_name(private), fp, authctxt->active_ktype)sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__, 2183, 1, SYSLOG_LEVEL_DEBUG1, ((void *)0), "trying hostkey %s %s using sigalg %s" , sshkey_ssh_name(private), fp, authctxt->active_ktype); |
| 2184 | |
| 2185 | /* figure out a name for the client host */ |
| 2186 | lname = get_local_name(ssh_packet_get_connection_in(ssh)); |
| 2187 | if (lname == NULL((void *)0)) { |
| 2188 | error_f("cannot get local ipaddr/name")sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__, 2188, 1, SYSLOG_LEVEL_ERROR, ((void *)0), "cannot get local ipaddr/name" ); |
| 2189 | goto out; |
| 2190 | } |
| 2191 | |
| 2192 | /* XXX sshbuf_put_stringf? */ |
| 2193 | xasprintf(&chost, "%s.", lname); |
| 2194 | debug2_f("chost %s", chost)sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__, 2194, 1, SYSLOG_LEVEL_DEBUG2, ((void *)0), "chost %s", chost ); |
| 2195 | |
| 2196 | /* construct data */ |
| 2197 | if ((b = sshbuf_new()) == NULL((void *)0)) { |
| 2198 | error_f("sshbuf_new failed")sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__, 2198, 1, SYSLOG_LEVEL_ERROR, ((void *)0), "sshbuf_new failed" ); |
| 2199 | goto out; |
| 2200 | } |
| 2201 | if ((r = sshkey_to_blob(private, &keyblob, &keylen)) != 0) { |
| 2202 | error_fr(r, "sshkey_to_blob")sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__, 2202, 1, SYSLOG_LEVEL_ERROR, ssh_err(r), "sshkey_to_blob"); |
| 2203 | goto out; |
| 2204 | } |
| 2205 | if ((r = sshbuf_put_stringb(b, ssh->kex->session_id)) != 0 || |
| 2206 | (r = sshbuf_put_u8(b, SSH2_MSG_USERAUTH_REQUEST50)) != 0 || |
| 2207 | (r = sshbuf_put_cstring(b, authctxt->server_user)) != 0 || |
| 2208 | (r = sshbuf_put_cstring(b, authctxt->service)) != 0 || |
| 2209 | (r = sshbuf_put_cstring(b, authctxt->method->name)) != 0 || |
| 2210 | (r = sshbuf_put_cstring(b, authctxt->active_ktype)) != 0 || |
| 2211 | (r = sshbuf_put_string(b, keyblob, keylen)) != 0 || |
| 2212 | (r = sshbuf_put_cstring(b, chost)) != 0 || |
| 2213 | (r = sshbuf_put_cstring(b, authctxt->local_user)) != 0) { |
| 2214 | error_fr(r, "buffer error")sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__, 2214, 1, SYSLOG_LEVEL_ERROR, ssh_err(r), "buffer error"); |
| 2215 | goto out; |
| 2216 | } |
| 2217 | |
| 2218 | #ifdef DEBUG_PK |
| 2219 | sshbuf_dump(b, stderr(&__sF[2])); |
| 2220 | #endif |
| 2221 | if ((r = ssh_keysign(ssh, private, &sig, &siglen, |
| 2222 | sshbuf_ptr(b), sshbuf_len(b))) != 0) { |
| 2223 | error("sign using hostkey %s %s failed",sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__, 2224, 0, SYSLOG_LEVEL_ERROR, ((void *)0), "sign using hostkey %s %s failed" , sshkey_ssh_name(private), fp) |
| 2224 | sshkey_ssh_name(private), fp)sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__, 2224, 0, SYSLOG_LEVEL_ERROR, ((void *)0), "sign using hostkey %s %s failed" , sshkey_ssh_name(private), fp); |
| 2225 | goto out; |
| 2226 | } |
| 2227 | if ((r = sshpkt_start(ssh, SSH2_MSG_USERAUTH_REQUEST50)) != 0 || |
| 2228 | (r = sshpkt_put_cstring(ssh, authctxt->server_user)) != 0 || |
| 2229 | (r = sshpkt_put_cstring(ssh, authctxt->service)) != 0 || |
| 2230 | (r = sshpkt_put_cstring(ssh, authctxt->method->name)) != 0 || |
| 2231 | (r = sshpkt_put_cstring(ssh, authctxt->active_ktype)) != 0 || |
| 2232 | (r = sshpkt_put_string(ssh, keyblob, keylen)) != 0 || |
| 2233 | (r = sshpkt_put_cstring(ssh, chost)) != 0 || |
| 2234 | (r = sshpkt_put_cstring(ssh, authctxt->local_user)) != 0 || |
| 2235 | (r = sshpkt_put_string(ssh, sig, siglen)) != 0 || |
| 2236 | (r = sshpkt_send(ssh)) != 0) { |
| 2237 | error_fr(r, "packet error")sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__, 2237, 1, SYSLOG_LEVEL_ERROR, ssh_err(r), "packet error"); |
| 2238 | goto out; |
| 2239 | } |
| 2240 | success = 1; |
| 2241 | |
| 2242 | out: |
| 2243 | if (sig != NULL((void *)0)) |
| 2244 | freezero(sig, siglen); |
| 2245 | free(keyblob); |
| 2246 | free(lname); |
| 2247 | free(fp); |
| 2248 | free(chost); |
| 2249 | sshkey_free(private); |
| 2250 | sshbuf_free(b); |
| 2251 | |
| 2252 | return success; |
| 2253 | } |
| 2254 | |
| 2255 | /* find auth method */ |
| 2256 | |
| 2257 | /* |
| 2258 | * given auth method name, if configurable options permit this method fill |
| 2259 | * in auth_ident field and return true, otherwise return false. |
| 2260 | */ |
| 2261 | static int |
| 2262 | authmethod_is_enabled(Authmethod *method) |
| 2263 | { |
| 2264 | if (method == NULL((void *)0)) |
| 2265 | return 0; |
| 2266 | /* return false if options indicate this method is disabled */ |
| 2267 | if (method->enabled == NULL((void *)0) || *method->enabled == 0) |
| 2268 | return 0; |
| 2269 | /* return false if batch mode is enabled but method needs interactive mode */ |
| 2270 | if (method->batch_flag != NULL((void *)0) && *method->batch_flag != 0) |
| 2271 | return 0; |
| 2272 | return 1; |
| 2273 | } |
| 2274 | |
| 2275 | static Authmethod * |
| 2276 | authmethod_lookup(const char *name) |
| 2277 | { |
| 2278 | Authmethod *method = NULL((void *)0); |
| 2279 | if (name != NULL((void *)0)) |
| 2280 | for (method = authmethods; method->name != NULL((void *)0); method++) |
| 2281 | if (strcmp(name, method->name) == 0) |
| 2282 | return method; |
| 2283 | debug2("Unrecognized authentication method name: %s", name ? name : "NULL")sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__, 2283, 0, SYSLOG_LEVEL_DEBUG2, ((void *)0), "Unrecognized authentication method name: %s" , name ? name : "NULL"); |
| 2284 | return NULL((void *)0); |
| 2285 | } |
| 2286 | |
| 2287 | /* XXX internal state */ |
| 2288 | static Authmethod *current = NULL((void *)0); |
| 2289 | static char *supported = NULL((void *)0); |
| 2290 | static char *preferred = NULL((void *)0); |
| 2291 | |
| 2292 | /* |
| 2293 | * Given the authentication method list sent by the server, return the |
| 2294 | * next method we should try. If the server initially sends a nil list, |
| 2295 | * use a built-in default list. |
| 2296 | */ |
| 2297 | static Authmethod * |
| 2298 | authmethod_get(char *authlist) |
| 2299 | { |
| 2300 | char *name = NULL((void *)0); |
| 2301 | u_int next; |
| 2302 | |
| 2303 | /* Use a suitable default if we're passed a nil list. */ |
| 2304 | if (authlist == NULL((void *)0) || strlen(authlist) == 0) |
| 2305 | authlist = options.preferred_authentications; |
| 2306 | |
| 2307 | if (supported == NULL((void *)0) || strcmp(authlist, supported) != 0) { |
| 2308 | debug3("start over, passed a different list %s", authlist)sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__, 2308, 0, SYSLOG_LEVEL_DEBUG3, ((void *)0), "start over, passed a different list %s" , authlist); |
| 2309 | free(supported); |
| 2310 | supported = xstrdup(authlist); |
| 2311 | preferred = options.preferred_authentications; |
| 2312 | debug3("preferred %s", preferred)sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__, 2312, 0, SYSLOG_LEVEL_DEBUG3, ((void *)0), "preferred %s", preferred ); |
| 2313 | current = NULL((void *)0); |
| 2314 | } else if (current != NULL((void *)0) && authmethod_is_enabled(current)) |
| 2315 | return current; |
| 2316 | |
| 2317 | for (;;) { |
| 2318 | if ((name = match_list(preferred, supported, &next)) == NULL((void *)0)) { |
| 2319 | debug("No more authentication methods to try.")sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__, 2319, 0, SYSLOG_LEVEL_DEBUG1, ((void *)0), "No more authentication methods to try." ); |
| 2320 | current = NULL((void *)0); |
| 2321 | return NULL((void *)0); |
| 2322 | } |
| 2323 | preferred += next; |
| 2324 | debug3("authmethod_lookup %s", name)sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__, 2324, 0, SYSLOG_LEVEL_DEBUG3, ((void *)0), "authmethod_lookup %s" , name); |
| 2325 | debug3("remaining preferred: %s", preferred)sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__, 2325, 0, SYSLOG_LEVEL_DEBUG3, ((void *)0), "remaining preferred: %s" , preferred); |
| 2326 | if ((current = authmethod_lookup(name)) != NULL((void *)0) && |
| 2327 | authmethod_is_enabled(current)) { |
| 2328 | debug3("authmethod_is_enabled %s", name)sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__, 2328, 0, SYSLOG_LEVEL_DEBUG3, ((void *)0), "authmethod_is_enabled %s" , name); |
| 2329 | debug("Next authentication method: %s", name)sshlog("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__, 2329, 0, SYSLOG_LEVEL_DEBUG1, ((void *)0), "Next authentication method: %s" , name); |
| 2330 | free(name); |
| 2331 | return current; |
| 2332 | } |
| 2333 | free(name); |
| 2334 | } |
| 2335 | } |
| 2336 | |
| 2337 | static char * |
| 2338 | authmethods_get(void) |
| 2339 | { |
| 2340 | Authmethod *method = NULL((void *)0); |
| 2341 | struct sshbuf *b; |
| 2342 | char *list; |
| 2343 | int r; |
| 2344 | |
| 2345 | if ((b = sshbuf_new()) == NULL((void *)0)) |
| 2346 | fatal_f("sshbuf_new failed")sshfatal("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__ , 2346, 1, SYSLOG_LEVEL_FATAL, ((void *)0), "sshbuf_new failed" ); |
| 2347 | for (method = authmethods; method->name != NULL((void *)0); method++) { |
| 2348 | if (authmethod_is_enabled(method)) { |
| 2349 | if ((r = sshbuf_putf(b, "%s%s", |
| 2350 | sshbuf_len(b) ? "," : "", method->name)) != 0) |
| 2351 | fatal_fr(r, "buffer error")sshfatal("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__ , 2351, 1, SYSLOG_LEVEL_FATAL, ssh_err(r), "buffer error"); |
| 2352 | } |
| 2353 | } |
| 2354 | if ((list = sshbuf_dup_string(b)) == NULL((void *)0)) |
| 2355 | fatal_f("sshbuf_dup_string failed")sshfatal("/usr/src/usr.bin/ssh/ssh/../sshconnect2.c", __func__ , 2355, 1, SYSLOG_LEVEL_FATAL, ((void *)0), "sshbuf_dup_string failed" ); |
| 2356 | sshbuf_free(b); |
| 2357 | return list; |
| 2358 | } |