Annotation of src/usr.bin/ssh/sshconnect2.c, Revision 1.307
1.307 ! dtucker 1: /* $OpenBSD: sshconnect2.c,v 1.306 2019/06/28 13:35:04 deraadt Exp $ */
1.1 markus 2: /*
3: * Copyright (c) 2000 Markus Friedl. All rights reserved.
1.170 djm 4: * Copyright (c) 2008 Damien Miller. All rights reserved.
1.1 markus 5: *
6: * Redistribution and use in source and binary forms, with or without
7: * modification, are permitted provided that the following conditions
8: * are met:
9: * 1. Redistributions of source code must retain the above copyright
10: * notice, this list of conditions and the following disclaimer.
11: * 2. Redistributions in binary form must reproduce the above copyright
12: * notice, this list of conditions and the following disclaimer in the
13: * documentation and/or other materials provided with the distribution.
14: *
15: * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
16: * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
17: * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
18: * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
19: * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
20: * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
21: * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
22: * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
23: * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
24: * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
25: */
26:
1.145 stevesk 27: #include <sys/types.h>
1.160 deraadt 28: #include <sys/socket.h>
1.145 stevesk 29: #include <sys/wait.h>
1.144 stevesk 30: #include <sys/queue.h>
1.146 stevesk 31: #include <sys/stat.h>
1.156 stevesk 32:
33: #include <errno.h>
1.174 dtucker 34: #include <fcntl.h>
1.164 jolan 35: #include <netdb.h>
1.159 stevesk 36: #include <stdio.h>
1.158 stevesk 37: #include <string.h>
1.160 deraadt 38: #include <signal.h>
39: #include <pwd.h>
1.157 stevesk 40: #include <unistd.h>
1.166 djm 41: #include <vis.h>
1.1 markus 42:
1.160 deraadt 43: #include "xmalloc.h"
1.1 markus 44: #include "ssh.h"
1.37 markus 45: #include "ssh2.h"
1.278 markus 46: #include "sshbuf.h"
1.1 markus 47: #include "packet.h"
48: #include "compat.h"
1.37 markus 49: #include "cipher.h"
1.278 markus 50: #include "sshkey.h"
1.1 markus 51: #include "kex.h"
52: #include "myproposal.h"
53: #include "sshconnect.h"
54: #include "authfile.h"
1.57 provos 55: #include "dh.h"
1.17 markus 56: #include "authfd.h"
1.37 markus 57: #include "log.h"
1.210 millert 58: #include "misc.h"
1.37 markus 59: #include "readconf.h"
1.53 markus 60: #include "match.h"
1.61 markus 61: #include "dispatch.h"
1.68 markus 62: #include "canohost.h"
1.100 markus 63: #include "msg.h"
64: #include "pathnames.h"
1.154 markus 65: #include "uidswap.h"
1.186 djm 66: #include "hostfile.h"
1.214 djm 67: #include "ssherr.h"
1.246 djm 68: #include "utf8.h"
1.22 provos 69:
1.121 markus 70: #ifdef GSSAPI
71: #include "ssh-gss.h"
72: #endif
1.293 djm 73:
1.1 markus 74: /* import */
75: extern char *client_version_string;
76: extern char *server_version_string;
77: extern Options options;
78:
79: /*
80: * SSH2 key exchange
81: */
82:
1.32 markus 83: u_char *session_id2 = NULL;
1.120 markus 84: u_int session_id2_len = 0;
1.1 markus 85:
1.61 markus 86: char *xxx_host;
87: struct sockaddr *xxx_hostaddr;
88:
1.76 itojun 89: static int
1.259 markus 90: verify_host_key_callback(struct sshkey *hostkey, struct ssh *ssh)
1.61 markus 91: {
1.75 markus 92: if (verify_host_key(xxx_host, xxx_hostaddr, hostkey) == -1)
1.83 markus 93: fatal("Host key verification failed.");
1.61 markus 94: return 0;
95: }
96:
1.186 djm 97: static char *
98: order_hostkeyalgs(char *host, struct sockaddr *hostaddr, u_short port)
99: {
100: char *oavail, *avail, *first, *last, *alg, *hostname, *ret;
101: size_t maxlen;
102: struct hostkeys *hostkeys;
103: int ktype;
1.188 djm 104: u_int i;
1.186 djm 105:
106: /* Find all hostkeys for this hostname */
107: get_hostfile_hostname_ipaddr(host, hostaddr, port, &hostname, NULL);
108: hostkeys = init_hostkeys();
1.188 djm 109: for (i = 0; i < options.num_user_hostfiles; i++)
110: load_hostkeys(hostkeys, hostname, options.user_hostfiles[i]);
111: for (i = 0; i < options.num_system_hostfiles; i++)
112: load_hostkeys(hostkeys, hostname, options.system_hostfiles[i]);
1.186 djm 113:
114: oavail = avail = xstrdup(KEX_DEFAULT_PK_ALG);
115: maxlen = strlen(avail) + 1;
116: first = xmalloc(maxlen);
117: last = xmalloc(maxlen);
118: *first = *last = '\0';
119:
120: #define ALG_APPEND(to, from) \
121: do { \
122: if (*to != '\0') \
123: strlcat(to, ",", maxlen); \
124: strlcat(to, from, maxlen); \
125: } while (0)
126:
127: while ((alg = strsep(&avail, ",")) && *alg != '\0') {
1.214 djm 128: if ((ktype = sshkey_type_from_name(alg)) == KEY_UNSPEC)
1.186 djm 129: fatal("%s: unknown alg %s", __func__, alg);
130: if (lookup_key_in_hostkeys_by_type(hostkeys,
1.214 djm 131: sshkey_type_plain(ktype), NULL))
1.186 djm 132: ALG_APPEND(first, alg);
133: else
134: ALG_APPEND(last, alg);
135: }
136: #undef ALG_APPEND
1.216 djm 137: xasprintf(&ret, "%s%s%s", first,
138: (*first == '\0' || *last == '\0') ? "" : ",", last);
1.186 djm 139: if (*first != '\0')
140: debug3("%s: prefer hostkeyalgs: %s", __func__, first);
141:
1.197 djm 142: free(first);
143: free(last);
144: free(hostname);
145: free(oavail);
1.186 djm 146: free_hostkeys(hostkeys);
147:
148: return ret;
149: }
150:
1.1 markus 151: void
1.291 djm 152: ssh_kex2(struct ssh *ssh, char *host, struct sockaddr *hostaddr, u_short port)
1.22 provos 153: {
1.205 markus 154: char *myproposal[PROPOSAL_MAX] = { KEX_CLIENT };
1.275 djm 155: char *s, *all_key;
1.221 markus 156: int r;
1.61 markus 157:
158: xxx_host = host;
159: xxx_hostaddr = hostaddr;
1.22 provos 160:
1.231 markus 161: if ((s = kex_names_cat(options.kex_algorithms, "ext-info-c")) == NULL)
162: fatal("%s: kex_names_cat", __func__);
1.284 djm 163: myproposal[PROPOSAL_KEX_ALGS] = compat_kex_proposal(s);
1.60 stevesk 164: myproposal[PROPOSAL_ENC_ALGS_CTOS] =
1.284 djm 165: compat_cipher_proposal(options.ciphers);
1.60 stevesk 166: myproposal[PROPOSAL_ENC_ALGS_STOC] =
1.284 djm 167: compat_cipher_proposal(options.ciphers);
1.245 dtucker 168: myproposal[PROPOSAL_COMP_ALGS_CTOS] =
169: myproposal[PROPOSAL_COMP_ALGS_STOC] = options.compression ?
1.277 sf 170: "zlib@openssh.com,zlib,none" : "none,zlib@openssh.com,zlib";
1.226 djm 171: myproposal[PROPOSAL_MAC_ALGS_CTOS] =
172: myproposal[PROPOSAL_MAC_ALGS_STOC] = options.macs;
173: if (options.hostkeyalgorithms != NULL) {
1.275 djm 174: all_key = sshkey_alg_list(0, 0, 1, ',');
175: if (kex_assemble_names(&options.hostkeyalgorithms,
176: KEX_DEFAULT_PK_ALG, all_key) != 0)
1.226 djm 177: fatal("%s: kex_assemble_namelist", __func__);
1.275 djm 178: free(all_key);
1.88 deraadt 179: myproposal[PROPOSAL_SERVER_HOST_KEY_ALGS] =
1.284 djm 180: compat_pkalg_proposal(options.hostkeyalgorithms);
1.226 djm 181: } else {
1.225 markus 182: /* Enforce default */
183: options.hostkeyalgorithms = xstrdup(KEX_DEFAULT_PK_ALG);
1.186 djm 184: /* Prefer algorithms that we already have keys for */
185: myproposal[PROPOSAL_SERVER_HOST_KEY_ALGS] =
1.200 djm 186: compat_pkalg_proposal(
1.284 djm 187: order_hostkeyalgs(host, hostaddr, port));
1.186 djm 188: }
1.115 markus 189:
1.196 dtucker 190: if (options.rekey_limit || options.rekey_interval)
1.294 djm 191: ssh_packet_set_rekey_limits(ssh, options.rekey_limit,
1.254 dtucker 192: options.rekey_interval);
1.22 provos 193:
1.65 markus 194: /* start key exchange */
1.291 djm 195: if ((r = kex_setup(ssh, myproposal)) != 0)
1.221 markus 196: fatal("kex_setup: %s", ssh_err(r));
1.207 markus 197: #ifdef WITH_OPENSSL
1.301 djm 198: ssh->kex->kex[KEX_DH_GRP1_SHA1] = kex_gen_client;
199: ssh->kex->kex[KEX_DH_GRP14_SHA1] = kex_gen_client;
200: ssh->kex->kex[KEX_DH_GRP14_SHA256] = kex_gen_client;
201: ssh->kex->kex[KEX_DH_GRP16_SHA512] = kex_gen_client;
202: ssh->kex->kex[KEX_DH_GRP18_SHA512] = kex_gen_client;
1.291 djm 203: ssh->kex->kex[KEX_DH_GEX_SHA1] = kexgex_client;
204: ssh->kex->kex[KEX_DH_GEX_SHA256] = kexgex_client;
1.301 djm 205: ssh->kex->kex[KEX_ECDH_SHA2] = kex_gen_client;
1.207 markus 206: #endif
1.301 djm 207: ssh->kex->kex[KEX_C25519_SHA256] = kex_gen_client;
208: ssh->kex->kex[KEX_KEM_SNTRUP4591761X25519_SHA512] = kex_gen_client;
1.291 djm 209: ssh->kex->verify_host_key=&verify_host_key_callback;
1.22 provos 210:
1.291 djm 211: ssh_dispatch_run_fatal(ssh, DISPATCH_BLOCK, &ssh->kex->done);
1.173 andreas 212:
1.231 markus 213: /* remove ext-info from the KEX proposals for rekeying */
214: myproposal[PROPOSAL_KEX_ALGS] =
1.284 djm 215: compat_kex_proposal(options.kex_algorithms);
1.291 djm 216: if ((r = kex_prop2buf(ssh->kex->my, myproposal)) != 0)
1.231 markus 217: fatal("kex_prop2buf: %s", ssh_err(r));
1.62 markus 218:
1.291 djm 219: session_id2 = ssh->kex->session_id;
220: session_id2_len = ssh->kex->session_id_len;
1.22 provos 221:
222: #ifdef DEBUG_KEXDH
223: /* send 1st encrypted/maced/compressed message */
1.278 markus 224: if ((r = sshpkt_start(ssh, SSH2_MSG_IGNORE)) != 0 ||
225: (r = sshpkt_put_cstring(ssh, "markus")) != 0 ||
1.280 markus 226: (r = sshpkt_send(ssh)) != 0 ||
227: (r = ssh_packet_write_wait(ssh)) != 0)
1.278 markus 228: fatal("%s: %s", __func__, ssh_err(r));
1.22 provos 229: #endif
1.1 markus 230: }
1.11 markus 231:
1.1 markus 232: /*
233: * Authenticate user
234: */
1.20 markus 235:
1.214 djm 236: typedef struct cauthctxt Authctxt;
237: typedef struct cauthmethod Authmethod;
1.117 markus 238: typedef struct identity Identity;
239: typedef struct idlist Idlist;
1.20 markus 240:
1.117 markus 241: struct identity {
242: TAILQ_ENTRY(identity) next;
1.214 djm 243: int agent_fd; /* >=0 if agent supports key */
244: struct sshkey *key; /* public/private key */
1.117 markus 245: char *filename; /* comment for agent-only keys */
246: int tried;
247: int isprivate; /* key points to the private key */
1.191 dtucker 248: int userprovided;
1.117 markus 249: };
250: TAILQ_HEAD(idlist, identity);
1.20 markus 251:
1.214 djm 252: struct cauthctxt {
1.20 markus 253: const char *server_user;
1.68 markus 254: const char *local_user;
1.20 markus 255: const char *host;
256: const char *service;
1.214 djm 257: struct cauthmethod *method;
1.183 djm 258: sig_atomic_t success;
1.51 markus 259: char *authlist;
1.302 djm 260: #ifdef GSSAPI
261: /* gssapi */
262: gss_OID_set gss_supported_mechs;
263: u_int mech_tried;
264: #endif
1.68 markus 265: /* pubkey */
1.214 djm 266: struct idlist keys;
267: int agent_fd;
1.68 markus 268: /* hostbased */
1.100 markus 269: Sensitive *sensitive;
1.223 djm 270: char *oktypes, *ktypes;
271: const char *active_ktype;
1.82 markus 272: /* kbd-interactive */
273: int info_req_seen;
1.292 djm 274: int attempt_kbdint;
275: /* password */
276: int attempt_passwd;
1.121 markus 277: /* generic */
278: void *methoddata;
1.20 markus 279: };
1.214 djm 280:
281: struct cauthmethod {
1.20 markus 282: char *name; /* string to compare against server's list */
1.295 djm 283: int (*userauth)(struct ssh *ssh);
284: void (*cleanup)(struct ssh *ssh);
1.20 markus 285: int *enabled; /* flag in option struct that enables method */
286: int *batch_flag; /* flag in option struct that disables method */
287: };
288:
1.302 djm 289: static int input_userauth_service_accept(int, u_int32_t, struct ssh *);
290: static int input_userauth_ext_info(int, u_int32_t, struct ssh *);
291: static int input_userauth_success(int, u_int32_t, struct ssh *);
292: static int input_userauth_failure(int, u_int32_t, struct ssh *);
293: static int input_userauth_banner(int, u_int32_t, struct ssh *);
294: static int input_userauth_error(int, u_int32_t, struct ssh *);
295: static int input_userauth_info_req(int, u_int32_t, struct ssh *);
296: static int input_userauth_pk_ok(int, u_int32_t, struct ssh *);
297: static int input_userauth_passwd_changereq(int, u_int32_t, struct ssh *);
298:
299: static int userauth_none(struct ssh *);
300: static int userauth_pubkey(struct ssh *);
301: static int userauth_passwd(struct ssh *);
302: static int userauth_kbdint(struct ssh *);
303: static int userauth_hostbased(struct ssh *);
1.20 markus 304:
1.121 markus 305: #ifdef GSSAPI
1.302 djm 306: static int userauth_gssapi(struct ssh *);
307: static void userauth_gssapi_cleanup(struct ssh *);
308: static int input_gssapi_response(int type, u_int32_t, struct ssh *);
309: static int input_gssapi_token(int type, u_int32_t, struct ssh *);
310: static int input_gssapi_error(int, u_int32_t, struct ssh *);
311: static int input_gssapi_errtok(int, u_int32_t, struct ssh *);
1.121 markus 312: #endif
313:
1.295 djm 314: void userauth(struct ssh *, char *);
1.51 markus 315:
1.303 djm 316: static void pubkey_cleanup(struct ssh *);
1.295 djm 317: static int sign_and_send_pubkey(struct ssh *ssh, Identity *);
1.117 markus 318: static void pubkey_prepare(Authctxt *);
1.251 djm 319: static void pubkey_reset(Authctxt *);
1.259 markus 320: static struct sshkey *load_identity_file(Identity *);
1.76 itojun 321:
322: static Authmethod *authmethod_get(char *authlist);
323: static Authmethod *authmethod_lookup(const char *name);
324: static char *authmethods_get(void);
1.20 markus 325:
326: Authmethod authmethods[] = {
1.121 markus 327: #ifdef GSSAPI
1.132 markus 328: {"gssapi-with-mic",
1.121 markus 329: userauth_gssapi,
1.302 djm 330: userauth_gssapi_cleanup,
1.121 markus 331: &options.gss_authentication,
332: NULL},
333: #endif
1.81 markus 334: {"hostbased",
335: userauth_hostbased,
1.170 djm 336: NULL,
1.81 markus 337: &options.hostbased_authentication,
338: NULL},
1.20 markus 339: {"publickey",
340: userauth_pubkey,
1.303 djm 341: NULL,
1.28 markus 342: &options.pubkey_authentication,
1.20 markus 343: NULL},
1.81 markus 344: {"keyboard-interactive",
345: userauth_kbdint,
1.170 djm 346: NULL,
1.81 markus 347: &options.kbd_interactive_authentication,
348: &options.batch_mode},
1.20 markus 349: {"password",
350: userauth_passwd,
1.170 djm 351: NULL,
1.20 markus 352: &options.password_authentication,
1.23 markus 353: &options.batch_mode},
354: {"none",
355: userauth_none,
356: NULL,
1.170 djm 357: NULL,
1.23 markus 358: NULL},
1.170 djm 359: {NULL, NULL, NULL, NULL, NULL}
1.20 markus 360: };
361:
362: void
1.291 djm 363: ssh_userauth2(struct ssh *ssh, const char *local_user,
364: const char *server_user, char *host, Sensitive *sensitive)
1.20 markus 365: {
366: Authctxt authctxt;
1.231 markus 367: int r;
1.39 markus 368:
1.73 markus 369: if (options.challenge_response_authentication)
1.39 markus 370: options.kbd_interactive_authentication = 1;
1.53 markus 371: if (options.preferred_authentications == NULL)
372: options.preferred_authentications = authmethods_get();
373:
1.20 markus 374: /* setup authentication context */
1.82 markus 375: memset(&authctxt, 0, sizeof(authctxt));
1.20 markus 376: authctxt.server_user = server_user;
1.68 markus 377: authctxt.local_user = local_user;
1.20 markus 378: authctxt.host = host;
379: authctxt.service = "ssh-connection"; /* service name */
380: authctxt.success = 0;
1.23 markus 381: authctxt.method = authmethod_lookup("none");
1.51 markus 382: authctxt.authlist = NULL;
1.121 markus 383: authctxt.methoddata = NULL;
1.100 markus 384: authctxt.sensitive = sensitive;
1.223 djm 385: authctxt.active_ktype = authctxt.oktypes = authctxt.ktypes = NULL;
1.82 markus 386: authctxt.info_req_seen = 0;
1.292 djm 387: authctxt.attempt_kbdint = 0;
388: authctxt.attempt_passwd = 0;
1.302 djm 389: #if GSSAPI
390: authctxt.gss_supported_mechs = NULL;
391: authctxt.mech_tried = 0;
392: #endif
1.215 djm 393: authctxt.agent_fd = -1;
1.289 djm 394: pubkey_prepare(&authctxt);
1.291 djm 395: if (authctxt.method == NULL) {
396: fatal("%s: internal error: cannot send userauth none request",
397: __func__);
398: }
1.20 markus 399:
1.231 markus 400: if ((r = sshpkt_start(ssh, SSH2_MSG_SERVICE_REQUEST)) != 0 ||
401: (r = sshpkt_put_cstring(ssh, "ssh-userauth")) != 0 ||
402: (r = sshpkt_send(ssh)) != 0)
403: fatal("%s: %s", __func__, ssh_err(r));
404:
1.260 markus 405: ssh->authctxt = &authctxt;
1.231 markus 406: ssh_dispatch_init(ssh, &input_userauth_error);
407: ssh_dispatch_set(ssh, SSH2_MSG_EXT_INFO, &input_userauth_ext_info);
408: ssh_dispatch_set(ssh, SSH2_MSG_SERVICE_ACCEPT, &input_userauth_service_accept);
1.263 markus 409: ssh_dispatch_run_fatal(ssh, DISPATCH_BLOCK, &authctxt.success); /* loop until success */
1.303 djm 410: pubkey_cleanup(ssh);
1.260 markus 411: ssh->authctxt = NULL;
1.20 markus 412:
1.231 markus 413: ssh_dispatch_range(ssh, SSH2_MSG_USERAUTH_MIN, SSH2_MSG_USERAUTH_MAX, NULL);
1.119 markus 414:
1.248 dtucker 415: if (!authctxt.success)
416: fatal("Authentication failed.");
1.109 markus 417: debug("Authentication succeeded (%s).", authctxt.method->name);
1.20 markus 418: }
1.119 markus 419:
1.231 markus 420: /* ARGSUSED */
1.302 djm 421: static int
1.261 markus 422: input_userauth_service_accept(int type, u_int32_t seq, struct ssh *ssh)
1.231 markus 423: {
424: int r;
425:
426: if (ssh_packet_remaining(ssh) > 0) {
427: char *reply;
428:
429: if ((r = sshpkt_get_cstring(ssh, &reply, NULL)) != 0)
430: goto out;
431: debug2("service_accept: %s", reply);
432: free(reply);
433: } else {
434: debug2("buggy server: service_accept w/o service");
435: }
436: if ((r = sshpkt_get_end(ssh)) != 0)
437: goto out;
438: debug("SSH2_MSG_SERVICE_ACCEPT received");
439:
440: /* initial userauth request */
1.295 djm 441: userauth_none(ssh);
1.231 markus 442:
443: ssh_dispatch_set(ssh, SSH2_MSG_EXT_INFO, &input_userauth_error);
444: ssh_dispatch_set(ssh, SSH2_MSG_USERAUTH_SUCCESS, &input_userauth_success);
445: ssh_dispatch_set(ssh, SSH2_MSG_USERAUTH_FAILURE, &input_userauth_failure);
446: ssh_dispatch_set(ssh, SSH2_MSG_USERAUTH_BANNER, &input_userauth_banner);
447: r = 0;
448: out:
449: return r;
450: }
451:
452: /* ARGSUSED */
1.302 djm 453: static int
1.261 markus 454: input_userauth_ext_info(int type, u_int32_t seqnr, struct ssh *ssh)
1.231 markus 455: {
1.261 markus 456: return kex_input_ext_info(type, seqnr, ssh);
1.231 markus 457: }
458:
1.20 markus 459: void
1.295 djm 460: userauth(struct ssh *ssh, char *authlist)
1.51 markus 461: {
1.295 djm 462: Authctxt *authctxt = (Authctxt *)ssh->authctxt;
1.278 markus 463:
1.170 djm 464: if (authctxt->method != NULL && authctxt->method->cleanup != NULL)
1.295 djm 465: authctxt->method->cleanup(ssh);
1.170 djm 466:
1.197 djm 467: free(authctxt->methoddata);
468: authctxt->methoddata = NULL;
1.51 markus 469: if (authlist == NULL) {
470: authlist = authctxt->authlist;
471: } else {
1.197 djm 472: free(authctxt->authlist);
1.51 markus 473: authctxt->authlist = authlist;
474: }
475: for (;;) {
476: Authmethod *method = authmethod_get(authlist);
477: if (method == NULL)
1.264 dtucker 478: fatal("%s@%s: Permission denied (%s).",
479: authctxt->server_user, authctxt->host, authlist);
1.51 markus 480: authctxt->method = method;
1.119 markus 481:
482: /* reset the per method handler */
1.278 markus 483: ssh_dispatch_range(ssh, SSH2_MSG_USERAUTH_PER_METHOD_MIN,
1.119 markus 484: SSH2_MSG_USERAUTH_PER_METHOD_MAX, NULL);
485:
486: /* and try new method */
1.295 djm 487: if (method->userauth(ssh) != 0) {
1.51 markus 488: debug2("we sent a %s packet, wait for reply", method->name);
489: break;
490: } else {
491: debug2("we did not send a packet, disable method");
492: method->enabled = NULL;
493: }
494: }
495: }
1.105 deraadt 496:
1.169 djm 497: /* ARGSUSED */
1.302 djm 498: static int
1.261 markus 499: input_userauth_error(int type, u_int32_t seq, struct ssh *ssh)
1.20 markus 500: {
1.295 djm 501: fatal("%s: bad message during authentication: type %d", __func__, type);
1.218 markus 502: return 0;
1.35 markus 503: }
1.105 deraadt 504:
1.169 djm 505: /* ARGSUSED */
1.302 djm 506: static int
1.261 markus 507: input_userauth_banner(int type, u_int32_t seq, struct ssh *ssh)
1.35 markus 508: {
1.295 djm 509: char *msg = NULL;
1.294 djm 510: size_t len;
511: int r;
1.126 deraadt 512:
1.246 djm 513: debug3("%s", __func__);
1.294 djm 514: if ((r = sshpkt_get_cstring(ssh, &msg, &len)) != 0 ||
1.295 djm 515: (r = sshpkt_get_cstring(ssh, NULL, NULL)) != 0)
1.294 djm 516: goto out;
1.246 djm 517: if (len > 0 && options.log_level >= SYSLOG_LEVEL_INFO)
518: fmprintf(stderr, "%s", msg);
1.294 djm 519: r = 0;
520: out:
1.246 djm 521: free(msg);
1.294 djm 522: return r;
1.20 markus 523: }
1.105 deraadt 524:
1.169 djm 525: /* ARGSUSED */
1.302 djm 526: static int
1.261 markus 527: input_userauth_success(int type, u_int32_t seq, struct ssh *ssh)
1.20 markus 528: {
1.260 markus 529: Authctxt *authctxt = ssh->authctxt;
1.172 djm 530:
1.20 markus 531: if (authctxt == NULL)
1.295 djm 532: fatal("%s: no authentication context", __func__);
1.197 djm 533: free(authctxt->authlist);
534: authctxt->authlist = NULL;
1.172 djm 535: if (authctxt->method != NULL && authctxt->method->cleanup != NULL)
1.295 djm 536: authctxt->method->cleanup(ssh);
1.197 djm 537: free(authctxt->methoddata);
538: authctxt->methoddata = NULL;
1.20 markus 539: authctxt->success = 1; /* break out */
1.218 markus 540: return 0;
1.20 markus 541: }
1.105 deraadt 542:
1.302 djm 543: #if 0
544: static int
1.261 markus 545: input_userauth_success_unexpected(int type, u_int32_t seq, struct ssh *ssh)
1.172 djm 546: {
1.260 markus 547: Authctxt *authctxt = ssh->authctxt;
1.172 djm 548:
549: if (authctxt == NULL)
550: fatal("%s: no authentication context", __func__);
551:
552: fatal("Unexpected authentication success during %s.",
553: authctxt->method->name);
1.218 markus 554: return 0;
1.172 djm 555: }
1.302 djm 556: #endif
1.172 djm 557:
1.169 djm 558: /* ARGSUSED */
1.302 djm 559: static int
1.261 markus 560: input_userauth_failure(int type, u_int32_t seq, struct ssh *ssh)
1.20 markus 561: {
1.260 markus 562: Authctxt *authctxt = ssh->authctxt;
1.20 markus 563: char *authlist = NULL;
1.278 markus 564: u_char partial;
1.20 markus 565:
566: if (authctxt == NULL)
567: fatal("input_userauth_failure: no authentication context");
568:
1.307 ! dtucker 569: if (sshpkt_get_cstring(ssh, &authlist, NULL) != 0 ||
! 570: sshpkt_get_u8(ssh, &partial) != 0 ||
! 571: sshpkt_get_end(ssh) != 0)
1.278 markus 572: goto out;
1.20 markus 573:
1.193 markus 574: if (partial != 0) {
1.247 dtucker 575: verbose("Authenticated with partial success.");
1.193 markus 576: /* reset state */
1.251 djm 577: pubkey_reset(authctxt);
1.193 markus 578: }
1.109 markus 579: debug("Authentications that can continue: %s", authlist);
1.20 markus 580:
1.295 djm 581: userauth(ssh, authlist);
1.278 markus 582: authlist = NULL;
583: out:
584: free(authlist);
1.218 markus 585: return 0;
1.51 markus 586: }
1.169 djm 587:
1.287 djm 588: /*
589: * Format an identity for logging including filename, key type, fingerprint
590: * and location (agent, etc.). Caller must free.
591: */
592: static char *
593: format_identity(Identity *id)
594: {
595: char *fp = NULL, *ret = NULL;
596:
597: if (id->key != NULL) {
598: fp = sshkey_fingerprint(id->key, options.fingerprint_hash,
599: SSH_FP_DEFAULT);
600: }
601: xasprintf(&ret, "%s %s%s%s%s%s%s",
602: id->filename,
603: id->key ? sshkey_type(id->key) : "", id->key ? " " : "",
604: fp ? fp : "",
605: id->userprovided ? " explicit" : "",
606: (id->key && (id->key->flags & SSHKEY_FLAG_EXT)) ? " token" : "",
607: id->agent_fd != -1 ? " agent" : "");
608: free(fp);
609: return ret;
610: }
611:
1.169 djm 612: /* ARGSUSED */
1.302 djm 613: static int
1.261 markus 614: input_userauth_pk_ok(int type, u_int32_t seq, struct ssh *ssh)
1.51 markus 615: {
1.260 markus 616: Authctxt *authctxt = ssh->authctxt;
1.259 markus 617: struct sshkey *key = NULL;
1.117 markus 618: Identity *id = NULL;
1.287 djm 619: int pktype, found = 0, sent = 0;
1.278 markus 620: size_t blen;
1.287 djm 621: char *pkalg = NULL, *fp = NULL, *ident = NULL;
1.278 markus 622: u_char *pkblob = NULL;
623: int r;
1.51 markus 624:
625: if (authctxt == NULL)
626: fatal("input_userauth_pk_ok: no authentication context");
1.267 djm 627:
1.278 markus 628: if ((r = sshpkt_get_cstring(ssh, &pkalg, NULL)) != 0 ||
629: (r = sshpkt_get_string(ssh, &pkblob, &blen)) != 0 ||
630: (r = sshpkt_get_end(ssh)) != 0)
631: goto done;
1.51 markus 632:
1.278 markus 633: if ((pktype = sshkey_type_from_name(pkalg)) == KEY_UNSPEC) {
1.287 djm 634: debug("%s: server sent unknown pkalg %s", __func__, pkalg);
1.117 markus 635: goto done;
636: }
1.278 markus 637: if ((r = sshkey_from_blob(pkblob, blen, &key)) != 0) {
638: debug("no key from blob. pkalg %s: %s", pkalg, ssh_err(r));
1.117 markus 639: goto done;
640: }
641: if (key->type != pktype) {
642: error("input_userauth_pk_ok: type mismatch "
643: "for decoded key (received %d, expected %d)",
644: key->type, pktype);
645: goto done;
646: }
647:
1.127 markus 648: /*
649: * search keys in the reverse order, because last candidate has been
650: * moved to the end of the queue. this also avoids confusion by
651: * duplicate keys
652: */
1.136 henning 653: TAILQ_FOREACH_REVERSE(id, &authctxt->keys, idlist, next) {
1.278 markus 654: if (sshkey_equal(key, id->key)) {
1.287 djm 655: found = 1;
1.51 markus 656: break;
657: }
1.117 markus 658: }
1.287 djm 659: if (!found || id == NULL) {
660: fp = sshkey_fingerprint(key, options.fingerprint_hash,
661: SSH_FP_DEFAULT);
662: error("%s: server replied with unknown key: %s %s", __func__,
663: sshkey_type(key), fp == NULL ? "<ERROR>" : fp);
664: goto done;
665: }
666: ident = format_identity(id);
667: debug("Server accepts key: %s", ident);
1.295 djm 668: sent = sign_and_send_pubkey(ssh, id);
1.278 markus 669: r = 0;
670: done:
671: sshkey_free(key);
1.287 djm 672: free(ident);
673: free(fp);
1.197 djm 674: free(pkalg);
675: free(pkblob);
1.51 markus 676:
1.106 deraadt 677: /* try another method if we did not send a packet */
1.278 markus 678: if (r == 0 && sent == 0)
1.295 djm 679: userauth(ssh, NULL);
1.278 markus 680: return r;
1.20 markus 681: }
1.121 markus 682:
683: #ifdef GSSAPI
1.302 djm 684: static int
1.295 djm 685: userauth_gssapi(struct ssh *ssh)
1.121 markus 686: {
1.295 djm 687: Authctxt *authctxt = (Authctxt *)ssh->authctxt;
1.121 markus 688: Gssctxt *gssctxt = NULL;
689: OM_uint32 min;
1.278 markus 690: int r, ok = 0;
1.302 djm 691: gss_OID mech = NULL;
1.121 markus 692:
693: /* Try one GSSAPI method at a time, rather than sending them all at
694: * once. */
695:
1.302 djm 696: if (authctxt->gss_supported_mechs == NULL)
697: gss_indicate_mechs(&min, &authctxt->gss_supported_mechs);
1.121 markus 698:
1.302 djm 699: /* Check to see whether the mechanism is usable before we offer it */
700: while (authctxt->mech_tried < authctxt->gss_supported_mechs->count &&
701: !ok) {
702: mech = &authctxt->gss_supported_mechs->
703: elements[authctxt->mech_tried];
1.121 markus 704: /* My DER encoding requires length<128 */
1.302 djm 705: if (mech->length < 128 && ssh_gssapi_check_mechanism(&gssctxt,
706: mech, authctxt->host)) {
1.121 markus 707: ok = 1; /* Mechanism works */
708: } else {
1.302 djm 709: authctxt->mech_tried++;
1.121 markus 710: }
711: }
712:
1.302 djm 713: if (!ok || mech == NULL)
1.139 djm 714: return 0;
1.121 markus 715:
716: authctxt->methoddata=(void *)gssctxt;
717:
1.278 markus 718: if ((r = sshpkt_start(ssh, SSH2_MSG_USERAUTH_REQUEST)) != 0 ||
719: (r = sshpkt_put_cstring(ssh, authctxt->server_user)) != 0 ||
720: (r = sshpkt_put_cstring(ssh, authctxt->service)) != 0 ||
721: (r = sshpkt_put_cstring(ssh, authctxt->method->name)) != 0 ||
722: (r = sshpkt_put_u32(ssh, 1)) != 0 ||
1.302 djm 723: (r = sshpkt_put_u32(ssh, (mech->length) + 2)) != 0 ||
1.278 markus 724: (r = sshpkt_put_u8(ssh, SSH_GSS_OIDTYPE)) != 0 ||
1.302 djm 725: (r = sshpkt_put_u8(ssh, mech->length)) != 0 ||
726: (r = sshpkt_put(ssh, mech->elements, mech->length)) != 0 ||
1.278 markus 727: (r = sshpkt_send(ssh)) != 0)
728: fatal("%s: %s", __func__, ssh_err(r));
729:
730: ssh_dispatch_set(ssh, SSH2_MSG_USERAUTH_GSSAPI_RESPONSE, &input_gssapi_response);
731: ssh_dispatch_set(ssh, SSH2_MSG_USERAUTH_GSSAPI_TOKEN, &input_gssapi_token);
732: ssh_dispatch_set(ssh, SSH2_MSG_USERAUTH_GSSAPI_ERROR, &input_gssapi_error);
733: ssh_dispatch_set(ssh, SSH2_MSG_USERAUTH_GSSAPI_ERRTOK, &input_gssapi_errtok);
1.121 markus 734:
1.302 djm 735: authctxt->mech_tried++; /* Move along to next candidate */
1.121 markus 736:
737: return 1;
738: }
739:
1.302 djm 740: static void
741: userauth_gssapi_cleanup(struct ssh *ssh)
742: {
743: Authctxt *authctxt = (Authctxt *)ssh->authctxt;
744: Gssctxt *gssctxt = (Gssctxt *)authctxt->methoddata;
745:
746: ssh_gssapi_delete_ctx(&gssctxt);
747: authctxt->methoddata = NULL;
748:
749: free(authctxt->gss_supported_mechs);
750: authctxt->gss_supported_mechs = NULL;
751: }
752:
1.130 markus 753: static OM_uint32
1.262 djm 754: process_gssapi_token(struct ssh *ssh, gss_buffer_t recv_tok)
1.130 markus 755: {
1.260 markus 756: Authctxt *authctxt = ssh->authctxt;
1.130 markus 757: Gssctxt *gssctxt = authctxt->methoddata;
758: gss_buffer_desc send_tok = GSS_C_EMPTY_BUFFER;
1.142 djm 759: gss_buffer_desc mic = GSS_C_EMPTY_BUFFER;
760: gss_buffer_desc gssbuf;
1.132 markus 761: OM_uint32 status, ms, flags;
1.278 markus 762: int r;
1.133 djm 763:
1.130 markus 764: status = ssh_gssapi_init_ctx(gssctxt, options.gss_deleg_creds,
1.132 markus 765: recv_tok, &send_tok, &flags);
1.130 markus 766:
767: if (send_tok.length > 0) {
1.278 markus 768: u_char type = GSS_ERROR(status) ?
769: SSH2_MSG_USERAUTH_GSSAPI_ERRTOK :
770: SSH2_MSG_USERAUTH_GSSAPI_TOKEN;
771:
772: if ((r = sshpkt_start(ssh, type)) != 0 ||
773: (r = sshpkt_put_string(ssh, send_tok.value,
774: send_tok.length)) != 0 ||
775: (r = sshpkt_send(ssh)) != 0)
776: fatal("%s: %s", __func__, ssh_err(r));
1.133 djm 777:
1.130 markus 778: gss_release_buffer(&ms, &send_tok);
779: }
1.133 djm 780:
1.130 markus 781: if (status == GSS_S_COMPLETE) {
1.132 markus 782: /* send either complete or MIC, depending on mechanism */
783: if (!(flags & GSS_C_INTEG_FLAG)) {
1.278 markus 784: if ((r = sshpkt_start(ssh,
785: SSH2_MSG_USERAUTH_GSSAPI_EXCHANGE_COMPLETE)) != 0 ||
786: (r = sshpkt_send(ssh)) != 0)
787: fatal("%s: %s", __func__, ssh_err(r));
1.132 markus 788: } else {
1.278 markus 789: struct sshbuf *b;
790:
791: if ((b = sshbuf_new()) == NULL)
792: fatal("%s: sshbuf_new failed", __func__);
793: ssh_gssapi_buildmic(b, authctxt->server_user,
1.132 markus 794: authctxt->service, "gssapi-with-mic");
795:
1.278 markus 796: if ((gssbuf.value = sshbuf_mutable_ptr(b)) == NULL)
797: fatal("%s: sshbuf_mutable_ptr failed", __func__);
798: gssbuf.length = sshbuf_len(b);
1.133 djm 799:
1.132 markus 800: status = ssh_gssapi_sign(gssctxt, &gssbuf, &mic);
1.133 djm 801:
1.132 markus 802: if (!GSS_ERROR(status)) {
1.278 markus 803: if ((r = sshpkt_start(ssh,
804: SSH2_MSG_USERAUTH_GSSAPI_MIC)) != 0 ||
805: (r = sshpkt_put_string(ssh, mic.value,
806: mic.length)) != 0 ||
807: (r = sshpkt_send(ssh)) != 0)
808: fatal("%s: %s", __func__, ssh_err(r));
1.132 markus 809: }
1.133 djm 810:
1.278 markus 811: sshbuf_free(b);
1.132 markus 812: gss_release_buffer(&ms, &mic);
1.133 djm 813: }
1.130 markus 814: }
1.133 djm 815:
1.130 markus 816: return status;
817: }
818:
1.169 djm 819: /* ARGSUSED */
1.302 djm 820: static int
1.261 markus 821: input_gssapi_response(int type, u_int32_t plen, struct ssh *ssh)
1.121 markus 822: {
1.260 markus 823: Authctxt *authctxt = ssh->authctxt;
1.121 markus 824: Gssctxt *gssctxt;
1.278 markus 825: size_t oidlen;
826: u_char *oidv = NULL;
827: int r;
1.121 markus 828:
829: if (authctxt == NULL)
830: fatal("input_gssapi_response: no authentication context");
831: gssctxt = authctxt->methoddata;
832:
833: /* Setup our OID */
1.278 markus 834: if ((r = sshpkt_get_string(ssh, &oidv, &oidlen)) != 0)
835: goto done;
1.121 markus 836:
1.129 markus 837: if (oidlen <= 2 ||
838: oidv[0] != SSH_GSS_OIDTYPE ||
839: oidv[1] != oidlen - 2) {
840: debug("Badly encoded mechanism OID received");
1.296 djm 841: userauth(ssh, NULL);
1.278 markus 842: goto ok;
1.121 markus 843: }
1.129 markus 844:
845: if (!ssh_gssapi_check_oid(gssctxt, oidv + 2, oidlen - 2))
846: fatal("Server returned different OID than expected");
1.121 markus 847:
1.278 markus 848: if ((r = sshpkt_get_end(ssh)) != 0)
849: goto done;
1.121 markus 850:
1.262 djm 851: if (GSS_ERROR(process_gssapi_token(ssh, GSS_C_NO_BUFFER))) {
1.121 markus 852: /* Start again with next method on list */
853: debug("Trying to start again");
1.296 djm 854: userauth(ssh, NULL);
1.278 markus 855: goto ok;
1.121 markus 856: }
1.278 markus 857: ok:
858: r = 0;
859: done:
860: free(oidv);
861: return r;
1.121 markus 862: }
863:
1.169 djm 864: /* ARGSUSED */
1.302 djm 865: static int
1.261 markus 866: input_gssapi_token(int type, u_int32_t plen, struct ssh *ssh)
1.121 markus 867: {
1.260 markus 868: Authctxt *authctxt = ssh->authctxt;
1.121 markus 869: gss_buffer_desc recv_tok;
1.278 markus 870: u_char *p = NULL;
871: size_t len;
1.130 markus 872: OM_uint32 status;
1.278 markus 873: int r;
1.121 markus 874:
875: if (authctxt == NULL)
876: fatal("input_gssapi_response: no authentication context");
877:
1.278 markus 878: if ((r = sshpkt_get_string(ssh, &p, &len)) != 0 ||
879: (r = sshpkt_get_end(ssh)) != 0)
880: goto out;
1.121 markus 881:
1.278 markus 882: recv_tok.value = p;
883: recv_tok.length = len;
1.262 djm 884: status = process_gssapi_token(ssh, &recv_tok);
1.121 markus 885:
1.278 markus 886: /* Start again with the next method in the list */
1.121 markus 887: if (GSS_ERROR(status)) {
1.296 djm 888: userauth(ssh, NULL);
1.278 markus 889: /* ok */
1.121 markus 890: }
1.278 markus 891: r = 0;
892: out:
893: free(p);
894: return r;
1.121 markus 895: }
896:
1.169 djm 897: /* ARGSUSED */
1.302 djm 898: static int
1.261 markus 899: input_gssapi_errtok(int type, u_int32_t plen, struct ssh *ssh)
1.121 markus 900: {
1.260 markus 901: Authctxt *authctxt = ssh->authctxt;
1.121 markus 902: Gssctxt *gssctxt;
903: gss_buffer_desc send_tok = GSS_C_EMPTY_BUFFER;
904: gss_buffer_desc recv_tok;
1.194 djm 905: OM_uint32 ms;
1.278 markus 906: u_char *p = NULL;
907: size_t len;
908: int r;
1.121 markus 909:
910: if (authctxt == NULL)
911: fatal("input_gssapi_response: no authentication context");
912: gssctxt = authctxt->methoddata;
913:
1.278 markus 914: if ((r = sshpkt_get_string(ssh, &p, &len)) != 0 ||
915: (r = sshpkt_get_end(ssh)) != 0) {
916: free(p);
917: return r;
918: }
1.121 markus 919:
920: /* Stick it into GSSAPI and see what it says */
1.278 markus 921: recv_tok.value = p;
922: recv_tok.length = len;
1.194 djm 923: (void)ssh_gssapi_init_ctx(gssctxt, options.gss_deleg_creds,
1.140 djm 924: &recv_tok, &send_tok, NULL);
1.278 markus 925: free(p);
1.121 markus 926: gss_release_buffer(&ms, &send_tok);
927:
928: /* Server will be returning a failed packet after this one */
1.220 djm 929: return 0;
1.121 markus 930: }
931:
1.169 djm 932: /* ARGSUSED */
1.302 djm 933: static int
1.261 markus 934: input_gssapi_error(int type, u_int32_t plen, struct ssh *ssh)
1.121 markus 935: {
1.278 markus 936: char *msg = NULL;
937: char *lang = NULL;
938: int r;
1.121 markus 939:
1.278 markus 940: if ((r = sshpkt_get_u32(ssh, NULL)) != 0 || /* maj */
941: (r = sshpkt_get_u32(ssh, NULL)) != 0 || /* min */
942: (r = sshpkt_get_cstring(ssh, &msg, NULL)) != 0 ||
943: (r = sshpkt_get_cstring(ssh, &lang, NULL)) != 0)
944: goto out;
945: r = sshpkt_get_end(ssh);
1.143 stevesk 946: debug("Server GSSAPI Error:\n%s", msg);
1.278 markus 947: out:
1.197 djm 948: free(msg);
949: free(lang);
1.278 markus 950: return r;
1.121 markus 951: }
952: #endif /* GSSAPI */
1.20 markus 953:
1.302 djm 954: static int
1.295 djm 955: userauth_none(struct ssh *ssh)
1.23 markus 956: {
1.295 djm 957: Authctxt *authctxt = (Authctxt *)ssh->authctxt;
1.278 markus 958: int r;
959:
1.23 markus 960: /* initial userauth request */
1.278 markus 961: if ((r = sshpkt_start(ssh, SSH2_MSG_USERAUTH_REQUEST)) != 0 ||
962: (r = sshpkt_put_cstring(ssh, authctxt->server_user)) != 0 ||
963: (r = sshpkt_put_cstring(ssh, authctxt->service)) != 0 ||
964: (r = sshpkt_put_cstring(ssh, authctxt->method->name)) != 0 ||
965: (r = sshpkt_send(ssh)) != 0)
966: fatal("%s: %s", __func__, ssh_err(r));
1.23 markus 967: return 1;
968: }
969:
1.302 djm 970: static int
1.295 djm 971: userauth_passwd(struct ssh *ssh)
1.1 markus 972: {
1.295 djm 973: Authctxt *authctxt = (Authctxt *)ssh->authctxt;
1.290 djm 974: char *password, *prompt = NULL;
1.175 dtucker 975: const char *host = options.host_key_alias ? options.host_key_alias :
976: authctxt->host;
1.278 markus 977: int r;
1.6 markus 978:
1.292 djm 979: if (authctxt->attempt_passwd++ >= options.number_of_password_prompts)
1.6 markus 980: return 0;
1.13 todd 981:
1.292 djm 982: if (authctxt->attempt_passwd != 1)
1.13 todd 983: error("Permission denied, please try again.");
1.1 markus 984:
1.290 djm 985: xasprintf(&prompt, "%s@%s's password: ", authctxt->server_user, host);
1.1 markus 986: password = read_passphrase(prompt, 0);
1.278 markus 987: if ((r = sshpkt_start(ssh, SSH2_MSG_USERAUTH_REQUEST)) != 0 ||
988: (r = sshpkt_put_cstring(ssh, authctxt->server_user)) != 0 ||
989: (r = sshpkt_put_cstring(ssh, authctxt->service)) != 0 ||
990: (r = sshpkt_put_cstring(ssh, authctxt->method->name)) != 0 ||
991: (r = sshpkt_put_u8(ssh, 0)) != 0 ||
992: (r = sshpkt_put_cstring(ssh, password)) != 0 ||
993: (r = sshpkt_add_padding(ssh, 64)) != 0 ||
994: (r = sshpkt_send(ssh)) != 0)
995: fatal("%s: %s", __func__, ssh_err(r));
1.99 markus 996:
1.290 djm 997: free(prompt);
998: if (password != NULL)
1.278 markus 999: freezero(password, strlen(password));
1000:
1001: ssh_dispatch_set(ssh, SSH2_MSG_USERAUTH_PASSWD_CHANGEREQ,
1.99 markus 1002: &input_userauth_passwd_changereq);
1003:
1.1 markus 1004: return 1;
1005: }
1.169 djm 1006:
1.99 markus 1007: /*
1008: * parse PASSWD_CHANGEREQ, prompt user and send SSH2_MSG_USERAUTH_REQUEST
1009: */
1.169 djm 1010: /* ARGSUSED */
1.302 djm 1011: static int
1.261 markus 1012: input_userauth_passwd_changereq(int type, u_int32_t seqnr, struct ssh *ssh)
1.99 markus 1013: {
1.260 markus 1014: Authctxt *authctxt = ssh->authctxt;
1.278 markus 1015: char *info = NULL, *lang = NULL, *password = NULL, *retype = NULL;
1.266 dtucker 1016: char prompt[256];
1.252 djm 1017: const char *host;
1.278 markus 1018: int r;
1.99 markus 1019:
1020: debug2("input_userauth_passwd_changereq");
1021:
1022: if (authctxt == NULL)
1023: fatal("input_userauth_passwd_changereq: "
1024: "no authentication context");
1.252 djm 1025: host = options.host_key_alias ? options.host_key_alias : authctxt->host;
1.99 markus 1026:
1.278 markus 1027: if ((r = sshpkt_get_cstring(ssh, &info, NULL)) != 0 ||
1028: (r = sshpkt_get_cstring(ssh, &lang, NULL)) != 0)
1029: goto out;
1.99 markus 1030: if (strlen(info) > 0)
1.116 itojun 1031: logit("%s", info);
1.278 markus 1032: if ((r = sshpkt_start(ssh, SSH2_MSG_USERAUTH_REQUEST)) != 0 ||
1033: (r = sshpkt_put_cstring(ssh, authctxt->server_user)) != 0 ||
1034: (r = sshpkt_put_cstring(ssh, authctxt->service)) != 0 ||
1035: (r = sshpkt_put_cstring(ssh, authctxt->method->name)) != 0 ||
1036: (r = sshpkt_put_u8(ssh, 1)) != 0) /* additional info */
1037: goto out;
1038:
1.104 deraadt 1039: snprintf(prompt, sizeof(prompt),
1.99 markus 1040: "Enter %.30s@%.128s's old password: ",
1.175 dtucker 1041: authctxt->server_user, host);
1.99 markus 1042: password = read_passphrase(prompt, 0);
1.278 markus 1043: if ((r = sshpkt_put_cstring(ssh, password)) != 0)
1044: goto out;
1045:
1046: freezero(password, strlen(password));
1.99 markus 1047: password = NULL;
1048: while (password == NULL) {
1.104 deraadt 1049: snprintf(prompt, sizeof(prompt),
1.99 markus 1050: "Enter %.30s@%.128s's new password: ",
1.175 dtucker 1051: authctxt->server_user, host);
1.99 markus 1052: password = read_passphrase(prompt, RP_ALLOW_EOF);
1053: if (password == NULL) {
1054: /* bail out */
1.278 markus 1055: r = 0;
1056: goto out;
1.99 markus 1057: }
1.104 deraadt 1058: snprintf(prompt, sizeof(prompt),
1.99 markus 1059: "Retype %.30s@%.128s's new password: ",
1.175 dtucker 1060: authctxt->server_user, host);
1.99 markus 1061: retype = read_passphrase(prompt, 0);
1062: if (strcmp(password, retype) != 0) {
1.278 markus 1063: freezero(password, strlen(password));
1.116 itojun 1064: logit("Mismatch; try again, EOF to quit.");
1.99 markus 1065: password = NULL;
1066: }
1.278 markus 1067: freezero(retype, strlen(retype));
1.99 markus 1068: }
1.278 markus 1069: if ((r = sshpkt_put_cstring(ssh, password)) != 0 ||
1070: (r = sshpkt_add_padding(ssh, 64)) != 0 ||
1071: (r = sshpkt_send(ssh)) != 0)
1072: goto out;
1.104 deraadt 1073:
1.278 markus 1074: ssh_dispatch_set(ssh, SSH2_MSG_USERAUTH_PASSWD_CHANGEREQ,
1.99 markus 1075: &input_userauth_passwd_changereq);
1.278 markus 1076: r = 0;
1077: out:
1078: if (password)
1079: freezero(password, strlen(password));
1080: free(info);
1081: free(lang);
1082: return r;
1.117 markus 1083: }
1084:
1.272 djm 1085: /*
1086: * Select an algorithm for publickey signatures.
1087: * Returns algorithm (caller must free) or NULL if no mutual algorithm found.
1088: *
1089: * Call with ssh==NULL to ignore server-sig-algs extension list and
1090: * only attempt with the key's base signature type.
1091: */
1092: static char *
1093: key_sig_algorithm(struct ssh *ssh, const struct sshkey *key)
1.231 markus 1094: {
1.274 djm 1095: char *allowed, *oallowed, *cp, *tmp, *alg = NULL;
1.231 markus 1096:
1.272 djm 1097: /*
1098: * The signature algorithm will only differ from the key algorithm
1099: * for RSA keys/certs and when the server advertises support for
1100: * newer (SHA2) algorithms.
1101: */
1102: if (ssh == NULL || ssh->kex->server_sig_algs == NULL ||
1.288 djm 1103: (key->type != KEY_RSA && key->type != KEY_RSA_CERT) ||
1104: (key->type == KEY_RSA_CERT && (datafellows & SSH_BUG_SIGTYPE))) {
1.272 djm 1105: /* Filter base key signature alg against our configuration */
1.279 markus 1106: return match_list(sshkey_ssh_name(key),
1.272 djm 1107: options.pubkey_key_types, NULL);
1.231 markus 1108: }
1109:
1.272 djm 1110: /*
1111: * For RSA keys/certs, since these might have a different sig type:
1112: * find the first entry in PubkeyAcceptedKeyTypes of the right type
1113: * that also appears in the supported signature algorithms list from
1114: * the server.
1115: */
1116: oallowed = allowed = xstrdup(options.pubkey_key_types);
1117: while ((cp = strsep(&allowed, ",")) != NULL) {
1118: if (sshkey_type_from_name(cp) != key->type)
1119: continue;
1.274 djm 1120: tmp = match_list(sshkey_sigalg_by_name(cp), ssh->kex->server_sig_algs, NULL);
1121: if (tmp != NULL)
1122: alg = xstrdup(cp);
1123: free(tmp);
1.272 djm 1124: if (alg != NULL)
1125: break;
1.269 djm 1126: }
1.272 djm 1127: free(oallowed);
1128: return alg;
1.269 djm 1129: }
1130:
1.117 markus 1131: static int
1.214 djm 1132: identity_sign(struct identity *id, u_char **sigp, size_t *lenp,
1.272 djm 1133: const u_char *data, size_t datalen, u_int compat, const char *alg)
1.117 markus 1134: {
1.259 markus 1135: struct sshkey *prv;
1.269 djm 1136: int r;
1.99 markus 1137:
1.272 djm 1138: /* The agent supports this key. */
1.269 djm 1139: if (id->key != NULL && id->agent_fd != -1) {
1.272 djm 1140: return ssh_agent_sign(id->agent_fd, id->key, sigp, lenp,
1141: data, datalen, alg, compat);
1.269 djm 1142: }
1.214 djm 1143:
1.117 markus 1144: /*
1.272 djm 1145: * We have already loaded the private key or the private key is
1146: * stored in external hardware.
1.117 markus 1147: */
1.255 djm 1148: if (id->key != NULL &&
1.272 djm 1149: (id->isprivate || (id->key->flags & SSHKEY_FLAG_EXT))) {
1150: if ((r = sshkey_sign(id->key, sigp, lenp, data, datalen,
1151: alg, compat)) != 0)
1152: return r;
1153: /*
1154: * PKCS#11 tokens may not support all signature algorithms,
1155: * so check what we get back.
1156: */
1157: if ((r = sshkey_check_sigtype(*sigp, *lenp, alg)) != 0)
1158: return r;
1159: return 0;
1160: }
1.255 djm 1161:
1.272 djm 1162: /* Load the private key from the file. */
1.229 jcs 1163: if ((prv = load_identity_file(id)) == NULL)
1.239 djm 1164: return SSH_ERR_KEY_NOT_FOUND;
1.265 djm 1165: if (id->key != NULL && !sshkey_equal_public(prv, id->key)) {
1166: error("%s: private key %s contents do not match public",
1167: __func__, id->filename);
1168: return SSH_ERR_KEY_NOT_FOUND;
1169: }
1.272 djm 1170: r = sshkey_sign(prv, sigp, lenp, data, datalen, alg, compat);
1.214 djm 1171: sshkey_free(prv);
1.269 djm 1172: return r;
1.51 markus 1173: }
1174:
1.76 itojun 1175: static int
1.255 djm 1176: id_filename_matches(Identity *id, Identity *private_id)
1177: {
1178: const char *suffixes[] = { ".pub", "-cert.pub", NULL };
1179: size_t len = strlen(id->filename), plen = strlen(private_id->filename);
1180: size_t i, slen;
1181:
1182: if (strcmp(id->filename, private_id->filename) == 0)
1183: return 1;
1184: for (i = 0; suffixes[i]; i++) {
1185: slen = strlen(suffixes[i]);
1186: if (len > slen && plen == len - slen &&
1187: strcmp(id->filename + (len - slen), suffixes[i]) == 0 &&
1188: memcmp(id->filename, private_id->filename, plen) == 0)
1189: return 1;
1190: }
1191: return 0;
1192: }
1193:
1194: static int
1.295 djm 1195: sign_and_send_pubkey(struct ssh *ssh, Identity *id)
1.1 markus 1196: {
1.295 djm 1197: Authctxt *authctxt = (Authctxt *)ssh->authctxt;
1.272 djm 1198: struct sshbuf *b = NULL;
1199: Identity *private_id, *sign_id = NULL;
1200: u_char *signature = NULL;
1201: size_t slen = 0, skip = 0;
1202: int r, fallback_sigtype, sent = 0;
1203: char *alg = NULL, *fp = NULL;
1204: const char *loc = "";
1.1 markus 1205:
1.222 djm 1206: if ((fp = sshkey_fingerprint(id->key, options.fingerprint_hash,
1207: SSH_FP_DEFAULT)) == NULL)
1208: return 0;
1.51 markus 1209:
1.272 djm 1210: debug3("%s: %s %s", __func__, sshkey_type(id->key), fp);
1.1 markus 1211:
1.227 djm 1212: /*
1213: * If the key is an certificate, try to find a matching private key
1214: * and use it to complete the signature.
1.241 djm 1215: * If no such private key exists, fall back to trying the certificate
1216: * key itself in case it has a private half already loaded.
1.272 djm 1217: * This will try to set sign_id to the private key that will perform
1218: * the signature.
1.227 djm 1219: */
1.272 djm 1220: if (sshkey_is_cert(id->key)) {
1.227 djm 1221: TAILQ_FOREACH(private_id, &authctxt->keys, next) {
1222: if (sshkey_equal_public(id->key, private_id->key) &&
1223: id->key->type != private_id->key->type) {
1.272 djm 1224: sign_id = private_id;
1.227 djm 1225: break;
1226: }
1227: }
1.255 djm 1228: /*
1229: * Exact key matches are preferred, but also allow
1230: * filename matches for non-PKCS#11/agent keys that
1231: * didn't load public keys. This supports the case
1232: * of keeping just a private key file and public
1233: * certificate on disk.
1234: */
1.272 djm 1235: if (sign_id == NULL &&
1236: !id->isprivate && id->agent_fd == -1 &&
1.255 djm 1237: (id->key->flags & SSHKEY_FLAG_EXT) == 0) {
1238: TAILQ_FOREACH(private_id, &authctxt->keys, next) {
1239: if (private_id->key == NULL &&
1240: id_filename_matches(id, private_id)) {
1.272 djm 1241: sign_id = private_id;
1.255 djm 1242: break;
1243: }
1244: }
1245: }
1.272 djm 1246: if (sign_id != NULL) {
1.227 djm 1247: debug2("%s: using private key \"%s\"%s for "
1248: "certificate", __func__, id->filename,
1249: id->agent_fd != -1 ? " from agent" : "");
1250: } else {
1.240 djm 1251: debug("%s: no separate private key for certificate "
1.227 djm 1252: "\"%s\"", __func__, id->filename);
1253: }
1254: }
1255:
1.272 djm 1256: /*
1257: * If the above didn't select another identity to do the signing
1258: * then default to the one we started with.
1259: */
1260: if (sign_id == NULL)
1261: sign_id = id;
1262:
1263: /* assemble and sign data */
1264: for (fallback_sigtype = 0; fallback_sigtype <= 1; fallback_sigtype++) {
1265: free(alg);
1266: slen = 0;
1267: signature = NULL;
1268: if ((alg = key_sig_algorithm(fallback_sigtype ? NULL : ssh,
1269: id->key)) == NULL) {
1270: error("%s: no mutual signature supported", __func__);
1271: goto out;
1272: }
1273: debug3("%s: signing using %s", __func__, alg);
1274:
1275: sshbuf_free(b);
1276: if ((b = sshbuf_new()) == NULL)
1277: fatal("%s: sshbuf_new failed", __func__);
1278: if (datafellows & SSH_OLD_SESSIONID) {
1279: if ((r = sshbuf_put(b, session_id2,
1280: session_id2_len)) != 0) {
1281: fatal("%s: sshbuf_put: %s",
1282: __func__, ssh_err(r));
1283: }
1284: } else {
1285: if ((r = sshbuf_put_string(b, session_id2,
1286: session_id2_len)) != 0) {
1287: fatal("%s: sshbuf_put_string: %s",
1288: __func__, ssh_err(r));
1289: }
1290: }
1.278 markus 1291: skip = sshbuf_len(b);
1.272 djm 1292: if ((r = sshbuf_put_u8(b, SSH2_MSG_USERAUTH_REQUEST)) != 0 ||
1293: (r = sshbuf_put_cstring(b, authctxt->server_user)) != 0 ||
1294: (r = sshbuf_put_cstring(b, authctxt->service)) != 0 ||
1295: (r = sshbuf_put_cstring(b, authctxt->method->name)) != 0 ||
1296: (r = sshbuf_put_u8(b, 1)) != 0 ||
1297: (r = sshbuf_put_cstring(b, alg)) != 0 ||
1298: (r = sshkey_puts(id->key, b)) != 0) {
1299: fatal("%s: assemble signed data: %s",
1300: __func__, ssh_err(r));
1301: }
1302:
1303: /* generate signature */
1304: r = identity_sign(sign_id, &signature, &slen,
1305: sshbuf_ptr(b), sshbuf_len(b), datafellows, alg);
1306: if (r == 0)
1307: break;
1308: else if (r == SSH_ERR_KEY_NOT_FOUND)
1309: goto out; /* soft failure */
1310: else if (r == SSH_ERR_SIGN_ALG_UNSUPPORTED &&
1311: !fallback_sigtype) {
1312: if (sign_id->agent_fd != -1)
1313: loc = "agent ";
1314: else if ((sign_id->key->flags & SSHKEY_FLAG_EXT) != 0)
1315: loc = "token ";
1316: logit("%skey %s %s returned incorrect signature type",
1317: loc, sshkey_type(id->key), fp);
1318: continue;
1319: }
1320: error("%s: signing failed: %s", __func__, ssh_err(r));
1321: goto out;
1.17 markus 1322: }
1.272 djm 1323: if (slen == 0 || signature == NULL) /* shouldn't happen */
1324: fatal("%s: no signature", __func__);
1.51 markus 1325:
1.1 markus 1326: /* append signature */
1.272 djm 1327: if ((r = sshbuf_put_string(b, signature, slen)) != 0)
1328: fatal("%s: append signature: %s", __func__, ssh_err(r));
1.1 markus 1329:
1.272 djm 1330: #ifdef DEBUG_PK
1331: sshbuf_dump(b, stderr);
1332: #endif
1.1 markus 1333: /* skip session id and packet type */
1.272 djm 1334: if ((r = sshbuf_consume(b, skip + 1)) != 0)
1335: fatal("%s: consume: %s", __func__, ssh_err(r));
1.1 markus 1336:
1337: /* put remaining data from buffer into packet */
1.272 djm 1338: if ((r = sshpkt_start(ssh, SSH2_MSG_USERAUTH_REQUEST)) != 0 ||
1339: (r = sshpkt_putb(ssh, b)) != 0 ||
1340: (r = sshpkt_send(ssh)) != 0)
1341: fatal("%s: enqueue request: %s", __func__, ssh_err(r));
1342:
1343: /* success */
1344: sent = 1;
1.17 markus 1345:
1.272 djm 1346: out:
1347: free(fp);
1348: free(alg);
1349: sshbuf_free(b);
1350: freezero(signature, slen);
1351: return sent;
1.16 markus 1352: }
1353:
1.76 itojun 1354: static int
1.295 djm 1355: send_pubkey_test(struct ssh *ssh, Identity *id)
1.20 markus 1356: {
1.295 djm 1357: Authctxt *authctxt = (Authctxt *)ssh->authctxt;
1.272 djm 1358: u_char *blob = NULL;
1359: char *alg = NULL;
1.278 markus 1360: size_t bloblen;
1361: u_int have_sig = 0;
1362: int sent = 0, r;
1.20 markus 1363:
1.272 djm 1364: if ((alg = key_sig_algorithm(ssh, id->key)) == NULL) {
1365: debug("%s: no mutual signature algorithm", __func__);
1366: goto out;
1367: }
1.16 markus 1368:
1.278 markus 1369: if ((r = sshkey_to_blob(id->key, &blob, &bloblen)) != 0) {
1.51 markus 1370: /* we cannot handle this key */
1.272 djm 1371: debug3("%s: cannot handle key", __func__);
1372: goto out;
1.16 markus 1373: }
1.51 markus 1374: /* register callback for USERAUTH_PK_OK message */
1.278 markus 1375: ssh_dispatch_set(ssh, SSH2_MSG_USERAUTH_PK_OK, &input_userauth_pk_ok);
1.51 markus 1376:
1.278 markus 1377: if ((r = sshpkt_start(ssh, SSH2_MSG_USERAUTH_REQUEST)) != 0 ||
1378: (r = sshpkt_put_cstring(ssh, authctxt->server_user)) != 0 ||
1379: (r = sshpkt_put_cstring(ssh, authctxt->service)) != 0 ||
1380: (r = sshpkt_put_cstring(ssh, authctxt->method->name)) != 0 ||
1381: (r = sshpkt_put_u8(ssh, have_sig)) != 0 ||
1382: (r = sshpkt_put_cstring(ssh, alg)) != 0 ||
1383: (r = sshpkt_put_string(ssh, blob, bloblen)) != 0 ||
1384: (r = sshpkt_send(ssh)) != 0)
1385: fatal("%s: %s", __func__, ssh_err(r));
1.272 djm 1386: sent = 1;
1.278 markus 1387:
1388: out:
1.272 djm 1389: free(alg);
1.197 djm 1390: free(blob);
1.272 djm 1391: return sent;
1.51 markus 1392: }
1393:
1.259 markus 1394: static struct sshkey *
1.229 jcs 1395: load_identity_file(Identity *id)
1.51 markus 1396: {
1.259 markus 1397: struct sshkey *private = NULL;
1.229 jcs 1398: char prompt[300], *passphrase, *comment;
1.215 djm 1399: int r, perm_ok = 0, quit = 0, i;
1.52 markus 1400: struct stat st;
1.16 markus 1401:
1.306 deraadt 1402: if (stat(id->filename, &st) == -1) {
1.229 jcs 1403: (id->userprovided ? logit : debug3)("no such identity: %s: %s",
1404: id->filename, strerror(errno));
1.52 markus 1405: return NULL;
1406: }
1.214 djm 1407: snprintf(prompt, sizeof prompt,
1.229 jcs 1408: "Enter passphrase for key '%.100s': ", id->filename);
1.214 djm 1409: for (i = 0; i <= options.number_of_password_prompts; i++) {
1410: if (i == 0)
1411: passphrase = "";
1412: else {
1.20 markus 1413: passphrase = read_passphrase(prompt, 0);
1.214 djm 1414: if (*passphrase == '\0') {
1.20 markus 1415: debug2("no passphrase given, try next key");
1.214 djm 1416: free(passphrase);
1417: break;
1418: }
1419: }
1.229 jcs 1420: switch ((r = sshkey_load_private_type(KEY_UNSPEC, id->filename,
1421: passphrase, &private, &comment, &perm_ok))) {
1.214 djm 1422: case 0:
1423: break;
1424: case SSH_ERR_KEY_WRONG_PASSPHRASE:
1425: if (options.batch_mode) {
1426: quit = 1;
1427: break;
1428: }
1.215 djm 1429: if (i != 0)
1430: debug2("bad passphrase given, try again...");
1.214 djm 1431: break;
1432: case SSH_ERR_SYSTEM_ERROR:
1433: if (errno == ENOENT) {
1434: debug2("Load key \"%s\": %s",
1.229 jcs 1435: id->filename, ssh_err(r));
1.51 markus 1436: quit = 1;
1.214 djm 1437: break;
1.20 markus 1438: }
1.214 djm 1439: /* FALLTHROUGH */
1440: default:
1.229 jcs 1441: error("Load key \"%s\": %s", id->filename, ssh_err(r));
1.214 djm 1442: quit = 1;
1443: break;
1444: }
1.230 djm 1445: if (!quit && private != NULL && id->agent_fd == -1 &&
1.229 jcs 1446: !(id->key && id->isprivate))
1447: maybe_add_key_to_agent(id->filename, private, comment,
1448: passphrase);
1.278 markus 1449: if (i > 0)
1450: freezero(passphrase, strlen(passphrase));
1.232 mmcc 1451: free(comment);
1.214 djm 1452: if (private != NULL || quit)
1453: break;
1.16 markus 1454: }
1.51 markus 1455: return private;
1456: }
1457:
1.272 djm 1458: static int
1459: key_type_allowed_by_config(struct sshkey *key)
1460: {
1461: if (match_pattern_list(sshkey_ssh_name(key),
1462: options.pubkey_key_types, 0) == 1)
1463: return 1;
1464:
1465: /* RSA keys/certs might be allowed by alternate signature types */
1466: switch (key->type) {
1467: case KEY_RSA:
1468: if (match_pattern_list("rsa-sha2-512",
1469: options.pubkey_key_types, 0) == 1)
1470: return 1;
1471: if (match_pattern_list("rsa-sha2-256",
1472: options.pubkey_key_types, 0) == 1)
1473: return 1;
1474: break;
1475: case KEY_RSA_CERT:
1476: if (match_pattern_list("rsa-sha2-512-cert-v01@openssh.com",
1477: options.pubkey_key_types, 0) == 1)
1478: return 1;
1479: if (match_pattern_list("rsa-sha2-256-cert-v01@openssh.com",
1480: options.pubkey_key_types, 0) == 1)
1481: return 1;
1482: break;
1483: }
1484: return 0;
1485: }
1486:
1487:
1.117 markus 1488: /*
1489: * try keys in the following order:
1.227 djm 1490: * 1. certificates listed in the config file
1491: * 2. other input certificates
1492: * 3. agent keys that are found in the config file
1493: * 4. other agent keys
1494: * 5. keys that are only listed in the config file
1.117 markus 1495: */
1496: static void
1497: pubkey_prepare(Authctxt *authctxt)
1.51 markus 1498: {
1.214 djm 1499: struct identity *id, *id2, *tmp;
1500: struct idlist agent, files, *preferred;
1501: struct sshkey *key;
1.230 djm 1502: int agent_fd = -1, i, r, found;
1.214 djm 1503: size_t j;
1504: struct ssh_identitylist *idlist;
1.287 djm 1505: char *ident;
1.51 markus 1506:
1.117 markus 1507: TAILQ_INIT(&agent); /* keys from the agent */
1508: TAILQ_INIT(&files); /* keys from the config file */
1509: preferred = &authctxt->keys;
1510: TAILQ_INIT(preferred); /* preferred order of keys */
1511:
1.190 djm 1512: /* list of keys stored in the filesystem and PKCS#11 */
1.117 markus 1513: for (i = 0; i < options.num_identity_files; i++) {
1514: key = options.identity_keys[i];
1.180 djm 1515: if (key && key->cert && key->cert->type != SSH2_CERT_TYPE_USER)
1.117 markus 1516: continue;
1517: options.identity_keys[i] = NULL;
1.150 djm 1518: id = xcalloc(1, sizeof(*id));
1.230 djm 1519: id->agent_fd = -1;
1.117 markus 1520: id->key = key;
1521: id->filename = xstrdup(options.identity_files[i]);
1.192 dtucker 1522: id->userprovided = options.identity_file_userprovided[i];
1.117 markus 1523: TAILQ_INSERT_TAIL(&files, id, next);
1.190 djm 1524: }
1.227 djm 1525: /* list of certificates specified by user */
1526: for (i = 0; i < options.num_certificate_files; i++) {
1527: key = options.certificates[i];
1.278 markus 1528: if (!sshkey_is_cert(key) || key->cert == NULL ||
1.227 djm 1529: key->cert->type != SSH2_CERT_TYPE_USER)
1530: continue;
1531: id = xcalloc(1, sizeof(*id));
1.230 djm 1532: id->agent_fd = -1;
1.227 djm 1533: id->key = key;
1534: id->filename = xstrdup(options.certificate_files[i]);
1535: id->userprovided = options.certificate_file_userprovided[i];
1536: TAILQ_INSERT_TAIL(preferred, id, next);
1.117 markus 1537: }
1538: /* list of keys supported by the agent */
1.214 djm 1539: if ((r = ssh_get_authentication_socket(&agent_fd)) != 0) {
1540: if (r != SSH_ERR_AGENT_NOT_PRESENT)
1541: debug("%s: ssh_get_authentication_socket: %s",
1542: __func__, ssh_err(r));
1.258 naddy 1543: } else if ((r = ssh_fetch_identitylist(agent_fd, &idlist)) != 0) {
1.214 djm 1544: if (r != SSH_ERR_AGENT_NO_IDENTITIES)
1545: debug("%s: ssh_fetch_identitylist: %s",
1546: __func__, ssh_err(r));
1.237 markus 1547: close(agent_fd);
1.214 djm 1548: } else {
1549: for (j = 0; j < idlist->nkeys; j++) {
1.117 markus 1550: found = 0;
1551: TAILQ_FOREACH(id, &files, next) {
1.214 djm 1552: /*
1553: * agent keys from the config file are
1554: * preferred
1555: */
1556: if (sshkey_equal(idlist->keys[j], id->key)) {
1.117 markus 1557: TAILQ_REMOVE(&files, id, next);
1558: TAILQ_INSERT_TAIL(preferred, id, next);
1.214 djm 1559: id->agent_fd = agent_fd;
1.117 markus 1560: found = 1;
1561: break;
1562: }
1563: }
1.135 markus 1564: if (!found && !options.identities_only) {
1.150 djm 1565: id = xcalloc(1, sizeof(*id));
1.214 djm 1566: /* XXX "steals" key/comment from idlist */
1567: id->key = idlist->keys[j];
1568: id->filename = idlist->comments[j];
1569: idlist->keys[j] = NULL;
1570: idlist->comments[j] = NULL;
1571: id->agent_fd = agent_fd;
1.117 markus 1572: TAILQ_INSERT_TAIL(&agent, id, next);
1573: }
1574: }
1.214 djm 1575: ssh_free_identitylist(idlist);
1.117 markus 1576: /* append remaining agent keys */
1577: for (id = TAILQ_FIRST(&agent); id; id = TAILQ_FIRST(&agent)) {
1578: TAILQ_REMOVE(&agent, id, next);
1579: TAILQ_INSERT_TAIL(preferred, id, next);
1580: }
1.214 djm 1581: authctxt->agent_fd = agent_fd;
1.244 djm 1582: }
1583: /* Prefer PKCS11 keys that are explicitly listed */
1584: TAILQ_FOREACH_SAFE(id, &files, next, tmp) {
1585: if (id->key == NULL || (id->key->flags & SSHKEY_FLAG_EXT) == 0)
1586: continue;
1587: found = 0;
1588: TAILQ_FOREACH(id2, &files, next) {
1589: if (id2->key == NULL ||
1590: (id2->key->flags & SSHKEY_FLAG_EXT) == 0)
1591: continue;
1592: if (sshkey_equal(id->key, id2->key)) {
1593: TAILQ_REMOVE(&files, id, next);
1594: TAILQ_INSERT_TAIL(preferred, id, next);
1595: found = 1;
1596: break;
1597: }
1598: }
1599: /* If IdentitiesOnly set and key not found then don't use it */
1600: if (!found && options.identities_only) {
1601: TAILQ_REMOVE(&files, id, next);
1.278 markus 1602: freezero(id, sizeof(*id));
1.244 djm 1603: }
1.117 markus 1604: }
1605: /* append remaining keys from the config file */
1606: for (id = TAILQ_FIRST(&files); id; id = TAILQ_FIRST(&files)) {
1607: TAILQ_REMOVE(&files, id, next);
1608: TAILQ_INSERT_TAIL(preferred, id, next);
1609: }
1.228 djm 1610: /* finally, filter by PubkeyAcceptedKeyTypes */
1611: TAILQ_FOREACH_SAFE(id, preferred, next, id2) {
1.273 djm 1612: if (id->key != NULL && !key_type_allowed_by_config(id->key)) {
1.228 djm 1613: debug("Skipping %s key %s - "
1614: "not in PubkeyAcceptedKeyTypes",
1615: sshkey_ssh_name(id->key), id->filename);
1616: TAILQ_REMOVE(preferred, id, next);
1617: sshkey_free(id->key);
1618: free(id->filename);
1619: memset(id, 0, sizeof(*id));
1620: continue;
1621: }
1.117 markus 1622: }
1.287 djm 1623: /* List the keys we plan on using */
1624: TAILQ_FOREACH_SAFE(id, preferred, next, id2) {
1625: ident = format_identity(id);
1626: debug("Will attempt key: %s", ident);
1627: free(ident);
1628: }
1629: debug2("%s: done", __func__);
1.17 markus 1630: }
1631:
1.117 markus 1632: static void
1.303 djm 1633: pubkey_cleanup(struct ssh *ssh)
1.51 markus 1634: {
1.302 djm 1635: Authctxt *authctxt = (Authctxt *)ssh->authctxt;
1.117 markus 1636: Identity *id;
1.51 markus 1637:
1.289 djm 1638: if (authctxt->agent_fd != -1) {
1.214 djm 1639: ssh_close_authentication_socket(authctxt->agent_fd);
1.289 djm 1640: authctxt->agent_fd = -1;
1641: }
1.117 markus 1642: for (id = TAILQ_FIRST(&authctxt->keys); id;
1643: id = TAILQ_FIRST(&authctxt->keys)) {
1644: TAILQ_REMOVE(&authctxt->keys, id, next);
1.235 mmcc 1645: sshkey_free(id->key);
1.197 djm 1646: free(id->filename);
1647: free(id);
1.117 markus 1648: }
1.1 markus 1649: }
1650:
1.251 djm 1651: static void
1652: pubkey_reset(Authctxt *authctxt)
1653: {
1654: Identity *id;
1655:
1656: TAILQ_FOREACH(id, &authctxt->keys, next)
1657: id->tried = 0;
1658: }
1659:
1.225 markus 1660: static int
1661: try_identity(Identity *id)
1662: {
1663: if (!id->key)
1664: return (0);
1.279 markus 1665: if (sshkey_type_plain(id->key->type) == KEY_RSA &&
1.225 markus 1666: (datafellows & SSH_BUG_RSASIGMD5) != 0) {
1667: debug("Skipped %s key %s for RSA/MD5 server",
1.279 markus 1668: sshkey_type(id->key), id->filename);
1.225 markus 1669: return (0);
1670: }
1.257 djm 1671: return 1;
1.225 markus 1672: }
1673:
1.302 djm 1674: static int
1.295 djm 1675: userauth_pubkey(struct ssh *ssh)
1.20 markus 1676: {
1.295 djm 1677: Authctxt *authctxt = (Authctxt *)ssh->authctxt;
1.117 markus 1678: Identity *id;
1.20 markus 1679: int sent = 0;
1.287 djm 1680: char *ident;
1.20 markus 1681:
1.117 markus 1682: while ((id = TAILQ_FIRST(&authctxt->keys))) {
1683: if (id->tried++)
1684: return (0);
1.127 markus 1685: /* move key to the end of the queue */
1.117 markus 1686: TAILQ_REMOVE(&authctxt->keys, id, next);
1687: TAILQ_INSERT_TAIL(&authctxt->keys, id, next);
1688: /*
1689: * send a test message if we have the public key. for
1690: * encrypted keys we cannot do this and have to load the
1691: * private key instead
1692: */
1.200 djm 1693: if (id->key != NULL) {
1.225 markus 1694: if (try_identity(id)) {
1.287 djm 1695: ident = format_identity(id);
1696: debug("Offering public key: %s", ident);
1697: free(ident);
1.295 djm 1698: sent = send_pubkey_test(ssh, id);
1.200 djm 1699: }
1700: } else {
1.117 markus 1701: debug("Trying private key: %s", id->filename);
1.229 jcs 1702: id->key = load_identity_file(id);
1.117 markus 1703: if (id->key != NULL) {
1.225 markus 1704: if (try_identity(id)) {
1705: id->isprivate = 1;
1.295 djm 1706: sent = sign_and_send_pubkey(ssh, id);
1.200 djm 1707: }
1.278 markus 1708: sshkey_free(id->key);
1.117 markus 1709: id->key = NULL;
1.251 djm 1710: id->isprivate = 0;
1.51 markus 1711: }
1712: }
1.117 markus 1713: if (sent)
1714: return (sent);
1.28 markus 1715: }
1.117 markus 1716: return (0);
1.20 markus 1717: }
1718:
1.23 markus 1719: /*
1720: * Send userauth request message specifying keyboard-interactive method.
1721: */
1.302 djm 1722: static int
1.295 djm 1723: userauth_kbdint(struct ssh *ssh)
1.23 markus 1724: {
1.295 djm 1725: Authctxt *authctxt = (Authctxt *)ssh->authctxt;
1.278 markus 1726: int r;
1.23 markus 1727:
1.292 djm 1728: if (authctxt->attempt_kbdint++ >= options.number_of_password_prompts)
1.23 markus 1729: return 0;
1.82 markus 1730: /* disable if no SSH2_MSG_USERAUTH_INFO_REQUEST has been seen */
1.292 djm 1731: if (authctxt->attempt_kbdint > 1 && !authctxt->info_req_seen) {
1.82 markus 1732: debug3("userauth_kbdint: disable: no info_req_seen");
1.278 markus 1733: ssh_dispatch_set(ssh, SSH2_MSG_USERAUTH_INFO_REQUEST, NULL);
1.82 markus 1734: return 0;
1735: }
1.23 markus 1736:
1737: debug2("userauth_kbdint");
1.278 markus 1738: if ((r = sshpkt_start(ssh, SSH2_MSG_USERAUTH_REQUEST)) != 0 ||
1739: (r = sshpkt_put_cstring(ssh, authctxt->server_user)) != 0 ||
1740: (r = sshpkt_put_cstring(ssh, authctxt->service)) != 0 ||
1741: (r = sshpkt_put_cstring(ssh, authctxt->method->name)) != 0 ||
1742: (r = sshpkt_put_cstring(ssh, "")) != 0 || /* lang */
1743: (r = sshpkt_put_cstring(ssh, options.kbd_interactive_devices ?
1744: options.kbd_interactive_devices : "")) != 0 ||
1745: (r = sshpkt_send(ssh)) != 0)
1746: fatal("%s: %s", __func__, ssh_err(r));
1.23 markus 1747:
1.278 markus 1748: ssh_dispatch_set(ssh, SSH2_MSG_USERAUTH_INFO_REQUEST, &input_userauth_info_req);
1.23 markus 1749: return 1;
1750: }
1751:
1752: /*
1.46 markus 1753: * parse INFO_REQUEST, prompt user and send INFO_RESPONSE
1.23 markus 1754: */
1.302 djm 1755: static int
1.261 markus 1756: input_userauth_info_req(int type, u_int32_t seq, struct ssh *ssh)
1.23 markus 1757: {
1.260 markus 1758: Authctxt *authctxt = ssh->authctxt;
1.278 markus 1759: char *name = NULL, *inst = NULL, *lang = NULL, *prompt = NULL;
1760: char *response = NULL;
1761: u_char echo = 0;
1.32 markus 1762: u_int num_prompts, i;
1.278 markus 1763: int r;
1.23 markus 1764:
1765: debug2("input_userauth_info_req");
1766:
1767: if (authctxt == NULL)
1768: fatal("input_userauth_info_req: no authentication context");
1.82 markus 1769:
1770: authctxt->info_req_seen = 1;
1.23 markus 1771:
1.278 markus 1772: if ((r = sshpkt_get_cstring(ssh, &name, NULL)) != 0 ||
1773: (r = sshpkt_get_cstring(ssh, &inst, NULL)) != 0 ||
1774: (r = sshpkt_get_cstring(ssh, &lang, NULL)) != 0)
1775: goto out;
1.23 markus 1776: if (strlen(name) > 0)
1.116 itojun 1777: logit("%s", name);
1.23 markus 1778: if (strlen(inst) > 0)
1.116 itojun 1779: logit("%s", inst);
1.23 markus 1780:
1.278 markus 1781: if ((r = sshpkt_get_u32(ssh, &num_prompts)) != 0)
1782: goto out;
1.23 markus 1783: /*
1784: * Begin to build info response packet based on prompts requested.
1785: * We commit to providing the correct number of responses, so if
1786: * further on we run into a problem that prevents this, we have to
1787: * be sure and clean this up and send a correct error response.
1788: */
1.278 markus 1789: if ((r = sshpkt_start(ssh, SSH2_MSG_USERAUTH_INFO_RESPONSE)) != 0 ||
1790: (r = sshpkt_put_u32(ssh, num_prompts)) != 0)
1791: goto out;
1.23 markus 1792:
1.73 markus 1793: debug2("input_userauth_info_req: num_prompts %d", num_prompts);
1.23 markus 1794: for (i = 0; i < num_prompts; i++) {
1.278 markus 1795: if ((r = sshpkt_get_cstring(ssh, &prompt, NULL)) != 0 ||
1796: (r = sshpkt_get_u8(ssh, &echo)) != 0)
1797: goto out;
1.77 markus 1798: response = read_passphrase(prompt, echo ? RP_ECHO : 0);
1.278 markus 1799: if ((r = sshpkt_put_cstring(ssh, response)) != 0)
1800: goto out;
1801: freezero(response, strlen(response));
1.197 djm 1802: free(prompt);
1.278 markus 1803: response = prompt = NULL;
1.23 markus 1804: }
1.278 markus 1805: /* done with parsing incoming message. */
1806: if ((r = sshpkt_get_end(ssh)) != 0 ||
1807: (r = sshpkt_add_padding(ssh, 64)) != 0)
1808: goto out;
1809: r = sshpkt_send(ssh);
1810: out:
1811: if (response)
1812: freezero(response, strlen(response));
1813: free(prompt);
1814: free(name);
1815: free(inst);
1816: free(lang);
1817: return r;
1.68 markus 1818: }
1819:
1.100 markus 1820: static int
1.294 djm 1821: ssh_keysign(struct ssh *ssh, struct sshkey *key, u_char **sigp, size_t *lenp,
1.223 djm 1822: const u_char *data, size_t datalen)
1.100 markus 1823: {
1.223 djm 1824: struct sshbuf *b;
1.101 markus 1825: struct stat st;
1.100 markus 1826: pid_t pid;
1.304 deraadt 1827: int r, to[2], from[2], status;
1.295 djm 1828: int sock = ssh_packet_get_connection_in(ssh);
1.223 djm 1829: u_char rversion = 0, version = 2;
1830: void (*osigchld)(int);
1.100 markus 1831:
1.223 djm 1832: *sigp = NULL;
1833: *lenp = 0;
1.100 markus 1834:
1.306 deraadt 1835: if (stat(_PATH_SSH_KEY_SIGN, &st) == -1) {
1.223 djm 1836: error("%s: not installed: %s", __func__, strerror(errno));
1837: return -1;
1838: }
1839: if (fflush(stdout) != 0) {
1840: error("%s: fflush: %s", __func__, strerror(errno));
1.101 markus 1841: return -1;
1842: }
1.306 deraadt 1843: if (pipe(to) == -1) {
1.223 djm 1844: error("%s: pipe: %s", __func__, strerror(errno));
1.100 markus 1845: return -1;
1846: }
1.306 deraadt 1847: if (pipe(from) == -1) {
1.223 djm 1848: error("%s: pipe: %s", __func__, strerror(errno));
1.100 markus 1849: return -1;
1850: }
1.306 deraadt 1851: if ((pid = fork()) == -1) {
1.223 djm 1852: error("%s: fork: %s", __func__, strerror(errno));
1.100 markus 1853: return -1;
1854: }
1.223 djm 1855: osigchld = signal(SIGCHLD, SIG_DFL);
1.100 markus 1856: if (pid == 0) {
1857: close(from[0]);
1.306 deraadt 1858: if (dup2(from[1], STDOUT_FILENO) == -1)
1.223 djm 1859: fatal("%s: dup2: %s", __func__, strerror(errno));
1.100 markus 1860: close(to[1]);
1.306 deraadt 1861: if (dup2(to[0], STDIN_FILENO) == -1)
1.223 djm 1862: fatal("%s: dup2: %s", __func__, strerror(errno));
1.103 markus 1863: close(from[1]);
1864: close(to[0]);
1.304 deraadt 1865:
1.306 deraadt 1866: if (dup2(sock, STDERR_FILENO + 1) == -1)
1.304 deraadt 1867: fatal("%s: dup2: %s", __func__, strerror(errno));
1868: sock = STDERR_FILENO + 1;
1869: fcntl(sock, F_SETFD, 0); /* keep the socket on exec */
1.223 djm 1870: closefrom(sock + 1);
1.304 deraadt 1871:
1.223 djm 1872: debug3("%s: [child] pid=%ld, exec %s",
1873: __func__, (long)getpid(), _PATH_SSH_KEY_SIGN);
1.233 mmcc 1874: execl(_PATH_SSH_KEY_SIGN, _PATH_SSH_KEY_SIGN, (char *)NULL);
1.223 djm 1875: fatal("%s: exec(%s): %s", __func__, _PATH_SSH_KEY_SIGN,
1.100 markus 1876: strerror(errno));
1877: }
1878: close(from[1]);
1879: close(to[0]);
1.305 djm 1880: sock = STDERR_FILENO + 1;
1.100 markus 1881:
1.223 djm 1882: if ((b = sshbuf_new()) == NULL)
1883: fatal("%s: sshbuf_new failed", __func__);
1884: /* send # of sock, data to be signed */
1.253 djm 1885: if ((r = sshbuf_put_u32(b, sock)) != 0 ||
1.223 djm 1886: (r = sshbuf_put_string(b, data, datalen)) != 0)
1887: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1888: if (ssh_msg_send(to[1], version, b) == -1)
1889: fatal("%s: couldn't send request", __func__);
1890: sshbuf_reset(b);
1891: r = ssh_msg_recv(from[0], b);
1.101 markus 1892: close(from[0]);
1893: close(to[1]);
1.223 djm 1894: if (r < 0) {
1895: error("%s: no reply", __func__);
1896: goto fail;
1897: }
1.101 markus 1898:
1.223 djm 1899: errno = 0;
1.306 deraadt 1900: while (waitpid(pid, &status, 0) == -1) {
1.223 djm 1901: if (errno != EINTR) {
1902: error("%s: waitpid %ld: %s",
1903: __func__, (long)pid, strerror(errno));
1904: goto fail;
1905: }
1906: }
1907: if (!WIFEXITED(status)) {
1908: error("%s: exited abnormally", __func__);
1909: goto fail;
1910: }
1911: if (WEXITSTATUS(status) != 0) {
1912: error("%s: exited with status %d",
1913: __func__, WEXITSTATUS(status));
1914: goto fail;
1915: }
1916: if ((r = sshbuf_get_u8(b, &rversion)) != 0) {
1917: error("%s: buffer error: %s", __func__, ssh_err(r));
1918: goto fail;
1919: }
1920: if (rversion != version) {
1921: error("%s: bad version", __func__);
1922: goto fail;
1923: }
1924: if ((r = sshbuf_get_string(b, sigp, lenp)) != 0) {
1925: error("%s: buffer error: %s", __func__, ssh_err(r));
1926: fail:
1927: signal(SIGCHLD, osigchld);
1928: sshbuf_free(b);
1.100 markus 1929: return -1;
1930: }
1.223 djm 1931: signal(SIGCHLD, osigchld);
1932: sshbuf_free(b);
1.100 markus 1933:
1934: return 0;
1935: }
1936:
1.302 djm 1937: static int
1.295 djm 1938: userauth_hostbased(struct ssh *ssh)
1.68 markus 1939: {
1.295 djm 1940: Authctxt *authctxt = (Authctxt *)ssh->authctxt;
1.223 djm 1941: struct sshkey *private = NULL;
1942: struct sshbuf *b = NULL;
1943: u_char *sig = NULL, *keyblob = NULL;
1944: char *fp = NULL, *chost = NULL, *lname = NULL;
1945: size_t siglen = 0, keylen = 0;
1946: int i, r, success = 0;
1947:
1948: if (authctxt->ktypes == NULL) {
1949: authctxt->oktypes = xstrdup(options.hostbased_key_types);
1950: authctxt->ktypes = authctxt->oktypes;
1951: }
1.213 djm 1952:
1.223 djm 1953: /*
1954: * Work through each listed type pattern in HostbasedKeyTypes,
1955: * trying each hostkey that matches the type in turn.
1956: */
1957: for (;;) {
1958: if (authctxt->active_ktype == NULL)
1959: authctxt->active_ktype = strsep(&authctxt->ktypes, ",");
1960: if (authctxt->active_ktype == NULL ||
1961: *authctxt->active_ktype == '\0')
1962: break;
1963: debug3("%s: trying key type %s", __func__,
1964: authctxt->active_ktype);
1.68 markus 1965:
1.223 djm 1966: /* check for a useful key */
1967: private = NULL;
1968: for (i = 0; i < authctxt->sensitive->nkeys; i++) {
1969: if (authctxt->sensitive->keys[i] == NULL ||
1970: authctxt->sensitive->keys[i]->type == KEY_UNSPEC)
1971: continue;
1972: if (match_pattern_list(
1973: sshkey_ssh_name(authctxt->sensitive->keys[i]),
1.224 djm 1974: authctxt->active_ktype, 0) != 1)
1.223 djm 1975: continue;
1.68 markus 1976: /* we take and free the key */
1.223 djm 1977: private = authctxt->sensitive->keys[i];
1978: authctxt->sensitive->keys[i] = NULL;
1.68 markus 1979: break;
1980: }
1.223 djm 1981: /* Found one */
1982: if (private != NULL)
1983: break;
1984: /* No more keys of this type; advance */
1985: authctxt->active_ktype = NULL;
1.68 markus 1986: }
1.223 djm 1987: if (private == NULL) {
1988: free(authctxt->oktypes);
1989: authctxt->oktypes = authctxt->ktypes = NULL;
1990: authctxt->active_ktype = NULL;
1.109 markus 1991: debug("No more client hostkeys for hostbased authentication.");
1.223 djm 1992: goto out;
1.68 markus 1993: }
1.211 djm 1994:
1.223 djm 1995: if ((fp = sshkey_fingerprint(private, options.fingerprint_hash,
1996: SSH_FP_DEFAULT)) == NULL) {
1997: error("%s: sshkey_fingerprint failed", __func__);
1998: goto out;
1.68 markus 1999: }
1.223 djm 2000: debug("%s: trying hostkey %s %s",
2001: __func__, sshkey_ssh_name(private), fp);
1.211 djm 2002:
1.84 markus 2003: /* figure out a name for the client host */
1.295 djm 2004: lname = get_local_name(ssh_packet_get_connection_in(ssh));
2005: if (lname == NULL) {
1.223 djm 2006: error("%s: cannot get local ipaddr/name", __func__);
2007: goto out;
1.84 markus 2008: }
1.223 djm 2009:
2010: /* XXX sshbuf_put_stringf? */
2011: xasprintf(&chost, "%s.", lname);
2012: debug2("%s: chost %s", __func__, chost);
1.84 markus 2013:
1.68 markus 2014: /* construct data */
1.223 djm 2015: if ((b = sshbuf_new()) == NULL) {
2016: error("%s: sshbuf_new failed", __func__);
2017: goto out;
2018: }
2019: if ((r = sshkey_to_blob(private, &keyblob, &keylen)) != 0) {
2020: error("%s: sshkey_to_blob: %s", __func__, ssh_err(r));
2021: goto out;
2022: }
2023: if ((r = sshbuf_put_string(b, session_id2, session_id2_len)) != 0 ||
2024: (r = sshbuf_put_u8(b, SSH2_MSG_USERAUTH_REQUEST)) != 0 ||
2025: (r = sshbuf_put_cstring(b, authctxt->server_user)) != 0 ||
1.267 djm 2026: (r = sshbuf_put_cstring(b, authctxt->service)) != 0 ||
1.223 djm 2027: (r = sshbuf_put_cstring(b, authctxt->method->name)) != 0 ||
1.279 markus 2028: (r = sshbuf_put_cstring(b, sshkey_ssh_name(private))) != 0 ||
1.223 djm 2029: (r = sshbuf_put_string(b, keyblob, keylen)) != 0 ||
2030: (r = sshbuf_put_cstring(b, chost)) != 0 ||
2031: (r = sshbuf_put_cstring(b, authctxt->local_user)) != 0) {
2032: error("%s: buffer error: %s", __func__, ssh_err(r));
2033: goto out;
2034: }
2035:
1.68 markus 2036: #ifdef DEBUG_PK
1.223 djm 2037: sshbuf_dump(b, stderr);
1.68 markus 2038: #endif
1.294 djm 2039: if ((r = ssh_keysign(ssh, private, &sig, &siglen,
2040: sshbuf_ptr(b), sshbuf_len(b))) != 0) {
1.223 djm 2041: error("sign using hostkey %s %s failed",
2042: sshkey_ssh_name(private), fp);
2043: goto out;
2044: }
2045: if ((r = sshpkt_start(ssh, SSH2_MSG_USERAUTH_REQUEST)) != 0 ||
2046: (r = sshpkt_put_cstring(ssh, authctxt->server_user)) != 0 ||
2047: (r = sshpkt_put_cstring(ssh, authctxt->service)) != 0 ||
2048: (r = sshpkt_put_cstring(ssh, authctxt->method->name)) != 0 ||
1.279 markus 2049: (r = sshpkt_put_cstring(ssh, sshkey_ssh_name(private))) != 0 ||
1.223 djm 2050: (r = sshpkt_put_string(ssh, keyblob, keylen)) != 0 ||
2051: (r = sshpkt_put_cstring(ssh, chost)) != 0 ||
2052: (r = sshpkt_put_cstring(ssh, authctxt->local_user)) != 0 ||
2053: (r = sshpkt_put_string(ssh, sig, siglen)) != 0 ||
2054: (r = sshpkt_send(ssh)) != 0) {
2055: error("%s: packet error: %s", __func__, ssh_err(r));
2056: goto out;
2057: }
2058: success = 1;
2059:
2060: out:
1.278 markus 2061: if (sig != NULL)
2062: freezero(sig, siglen);
1.223 djm 2063: free(keyblob);
2064: free(lname);
2065: free(fp);
1.197 djm 2066: free(chost);
1.223 djm 2067: sshkey_free(private);
2068: sshbuf_free(b);
1.68 markus 2069:
1.223 djm 2070: return success;
1.23 markus 2071: }
1.170 djm 2072:
1.20 markus 2073: /* find auth method */
2074:
2075: /*
2076: * given auth method name, if configurable options permit this method fill
2077: * in auth_ident field and return true, otherwise return false.
2078: */
1.76 itojun 2079: static int
1.20 markus 2080: authmethod_is_enabled(Authmethod *method)
2081: {
2082: if (method == NULL)
2083: return 0;
2084: /* return false if options indicate this method is disabled */
2085: if (method->enabled == NULL || *method->enabled == 0)
2086: return 0;
2087: /* return false if batch mode is enabled but method needs interactive mode */
2088: if (method->batch_flag != NULL && *method->batch_flag != 0)
2089: return 0;
2090: return 1;
2091: }
2092:
1.76 itojun 2093: static Authmethod *
1.20 markus 2094: authmethod_lookup(const char *name)
1.1 markus 2095: {
1.20 markus 2096: Authmethod *method = NULL;
2097: if (name != NULL)
2098: for (method = authmethods; method->name != NULL; method++)
2099: if (strcmp(name, method->name) == 0)
2100: return method;
2101: debug2("Unrecognized authentication method name: %s", name ? name : "NULL");
2102: return NULL;
2103: }
1.1 markus 2104:
1.53 markus 2105: /* XXX internal state */
2106: static Authmethod *current = NULL;
2107: static char *supported = NULL;
2108: static char *preferred = NULL;
1.105 deraadt 2109:
1.20 markus 2110: /*
2111: * Given the authentication method list sent by the server, return the
2112: * next method we should try. If the server initially sends a nil list,
1.67 markus 2113: * use a built-in default list.
1.41 stevesk 2114: */
1.76 itojun 2115: static Authmethod *
1.20 markus 2116: authmethod_get(char *authlist)
2117: {
1.53 markus 2118: char *name = NULL;
1.97 markus 2119: u_int next;
1.41 stevesk 2120:
1.20 markus 2121: /* Use a suitable default if we're passed a nil list. */
2122: if (authlist == NULL || strlen(authlist) == 0)
1.53 markus 2123: authlist = options.preferred_authentications;
1.20 markus 2124:
1.53 markus 2125: if (supported == NULL || strcmp(authlist, supported) != 0) {
2126: debug3("start over, passed a different list %s", authlist);
1.197 djm 2127: free(supported);
1.53 markus 2128: supported = xstrdup(authlist);
2129: preferred = options.preferred_authentications;
2130: debug3("preferred %s", preferred);
2131: current = NULL;
2132: } else if (current != NULL && authmethod_is_enabled(current))
2133: return current;
1.20 markus 2134:
1.53 markus 2135: for (;;) {
2136: if ((name = match_list(preferred, supported, &next)) == NULL) {
1.109 markus 2137: debug("No more authentication methods to try.");
1.53 markus 2138: current = NULL;
2139: return NULL;
2140: }
2141: preferred += next;
1.23 markus 2142: debug3("authmethod_lookup %s", name);
1.53 markus 2143: debug3("remaining preferred: %s", preferred);
2144: if ((current = authmethod_lookup(name)) != NULL &&
2145: authmethod_is_enabled(current)) {
1.23 markus 2146: debug3("authmethod_is_enabled %s", name);
1.109 markus 2147: debug("Next authentication method: %s", name);
1.197 djm 2148: free(name);
1.53 markus 2149: return current;
1.23 markus 2150: }
1.198 dtucker 2151: free(name);
1.1 markus 2152: }
1.53 markus 2153: }
1.1 markus 2154:
1.79 stevesk 2155: static char *
1.53 markus 2156: authmethods_get(void)
2157: {
2158: Authmethod *method = NULL;
1.278 markus 2159: struct sshbuf *b;
1.93 markus 2160: char *list;
1.278 markus 2161: int r;
1.27 provos 2162:
1.278 markus 2163: if ((b = sshbuf_new()) == NULL)
2164: fatal("%s: sshbuf_new failed", __func__);
1.53 markus 2165: for (method = authmethods; method->name != NULL; method++) {
2166: if (authmethod_is_enabled(method)) {
1.278 markus 2167: if ((r = sshbuf_putf(b, "%s%s",
2168: sshbuf_len(b) ? "," : "", method->name)) != 0)
2169: fatal("%s: buffer error: %s",
2170: __func__, ssh_err(r));
1.53 markus 2171: }
2172: }
1.278 markus 2173: if ((list = sshbuf_dup_string(b)) == NULL)
1.242 djm 2174: fatal("%s: sshbuf_dup_string failed", __func__);
1.278 markus 2175: sshbuf_free(b);
1.93 markus 2176: return list;
1.1 markus 2177: }