Annotation of src/usr.bin/ssh/sshconnect2.c, Revision 1.300
1.300 ! djm 1: /* $OpenBSD: sshconnect2.c,v 1.299 2019/01/21 10:28:02 djm Exp $ */
1.1 markus 2: /*
3: * Copyright (c) 2000 Markus Friedl. All rights reserved.
1.170 djm 4: * Copyright (c) 2008 Damien Miller. All rights reserved.
1.1 markus 5: *
6: * Redistribution and use in source and binary forms, with or without
7: * modification, are permitted provided that the following conditions
8: * are met:
9: * 1. Redistributions of source code must retain the above copyright
10: * notice, this list of conditions and the following disclaimer.
11: * 2. Redistributions in binary form must reproduce the above copyright
12: * notice, this list of conditions and the following disclaimer in the
13: * documentation and/or other materials provided with the distribution.
14: *
15: * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
16: * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
17: * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
18: * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
19: * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
20: * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
21: * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
22: * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
23: * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
24: * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
25: */
26:
1.145 stevesk 27: #include <sys/types.h>
1.160 deraadt 28: #include <sys/socket.h>
1.145 stevesk 29: #include <sys/wait.h>
1.144 stevesk 30: #include <sys/queue.h>
1.146 stevesk 31: #include <sys/stat.h>
1.156 stevesk 32:
33: #include <errno.h>
1.174 dtucker 34: #include <fcntl.h>
1.164 jolan 35: #include <netdb.h>
1.159 stevesk 36: #include <stdio.h>
1.158 stevesk 37: #include <string.h>
1.160 deraadt 38: #include <signal.h>
39: #include <pwd.h>
1.157 stevesk 40: #include <unistd.h>
1.166 djm 41: #include <vis.h>
1.1 markus 42:
1.160 deraadt 43: #include "xmalloc.h"
1.1 markus 44: #include "ssh.h"
1.37 markus 45: #include "ssh2.h"
1.278 markus 46: #include "sshbuf.h"
1.1 markus 47: #include "packet.h"
48: #include "compat.h"
1.37 markus 49: #include "cipher.h"
1.278 markus 50: #include "sshkey.h"
1.1 markus 51: #include "kex.h"
52: #include "myproposal.h"
53: #include "sshconnect.h"
54: #include "authfile.h"
1.57 provos 55: #include "dh.h"
1.17 markus 56: #include "authfd.h"
1.37 markus 57: #include "log.h"
1.210 millert 58: #include "misc.h"
1.37 markus 59: #include "readconf.h"
1.53 markus 60: #include "match.h"
1.61 markus 61: #include "dispatch.h"
1.68 markus 62: #include "canohost.h"
1.100 markus 63: #include "msg.h"
64: #include "pathnames.h"
1.154 markus 65: #include "uidswap.h"
1.186 djm 66: #include "hostfile.h"
1.214 djm 67: #include "ssherr.h"
1.246 djm 68: #include "utf8.h"
1.22 provos 69:
1.121 markus 70: #ifdef GSSAPI
71: #include "ssh-gss.h"
72: #endif
1.293 djm 73:
1.1 markus 74: /* import */
75: extern char *client_version_string;
76: extern char *server_version_string;
77: extern Options options;
78:
79: /*
80: * SSH2 key exchange
81: */
82:
1.32 markus 83: u_char *session_id2 = NULL;
1.120 markus 84: u_int session_id2_len = 0;
1.1 markus 85:
1.61 markus 86: char *xxx_host;
87: struct sockaddr *xxx_hostaddr;
88:
1.76 itojun 89: static int
1.259 markus 90: verify_host_key_callback(struct sshkey *hostkey, struct ssh *ssh)
1.61 markus 91: {
1.75 markus 92: if (verify_host_key(xxx_host, xxx_hostaddr, hostkey) == -1)
1.83 markus 93: fatal("Host key verification failed.");
1.61 markus 94: return 0;
95: }
96:
1.186 djm 97: static char *
98: order_hostkeyalgs(char *host, struct sockaddr *hostaddr, u_short port)
99: {
100: char *oavail, *avail, *first, *last, *alg, *hostname, *ret;
101: size_t maxlen;
102: struct hostkeys *hostkeys;
103: int ktype;
1.188 djm 104: u_int i;
1.186 djm 105:
106: /* Find all hostkeys for this hostname */
107: get_hostfile_hostname_ipaddr(host, hostaddr, port, &hostname, NULL);
108: hostkeys = init_hostkeys();
1.188 djm 109: for (i = 0; i < options.num_user_hostfiles; i++)
110: load_hostkeys(hostkeys, hostname, options.user_hostfiles[i]);
111: for (i = 0; i < options.num_system_hostfiles; i++)
112: load_hostkeys(hostkeys, hostname, options.system_hostfiles[i]);
1.186 djm 113:
114: oavail = avail = xstrdup(KEX_DEFAULT_PK_ALG);
115: maxlen = strlen(avail) + 1;
116: first = xmalloc(maxlen);
117: last = xmalloc(maxlen);
118: *first = *last = '\0';
119:
120: #define ALG_APPEND(to, from) \
121: do { \
122: if (*to != '\0') \
123: strlcat(to, ",", maxlen); \
124: strlcat(to, from, maxlen); \
125: } while (0)
126:
127: while ((alg = strsep(&avail, ",")) && *alg != '\0') {
1.214 djm 128: if ((ktype = sshkey_type_from_name(alg)) == KEY_UNSPEC)
1.186 djm 129: fatal("%s: unknown alg %s", __func__, alg);
130: if (lookup_key_in_hostkeys_by_type(hostkeys,
1.214 djm 131: sshkey_type_plain(ktype), NULL))
1.186 djm 132: ALG_APPEND(first, alg);
133: else
134: ALG_APPEND(last, alg);
135: }
136: #undef ALG_APPEND
1.216 djm 137: xasprintf(&ret, "%s%s%s", first,
138: (*first == '\0' || *last == '\0') ? "" : ",", last);
1.186 djm 139: if (*first != '\0')
140: debug3("%s: prefer hostkeyalgs: %s", __func__, first);
141:
1.197 djm 142: free(first);
143: free(last);
144: free(hostname);
145: free(oavail);
1.186 djm 146: free_hostkeys(hostkeys);
147:
148: return ret;
149: }
150:
1.1 markus 151: void
1.291 djm 152: ssh_kex2(struct ssh *ssh, char *host, struct sockaddr *hostaddr, u_short port)
1.22 provos 153: {
1.205 markus 154: char *myproposal[PROPOSAL_MAX] = { KEX_CLIENT };
1.275 djm 155: char *s, *all_key;
1.221 markus 156: int r;
1.61 markus 157:
158: xxx_host = host;
159: xxx_hostaddr = hostaddr;
1.22 provos 160:
1.231 markus 161: if ((s = kex_names_cat(options.kex_algorithms, "ext-info-c")) == NULL)
162: fatal("%s: kex_names_cat", __func__);
1.284 djm 163: myproposal[PROPOSAL_KEX_ALGS] = compat_kex_proposal(s);
1.60 stevesk 164: myproposal[PROPOSAL_ENC_ALGS_CTOS] =
1.284 djm 165: compat_cipher_proposal(options.ciphers);
1.60 stevesk 166: myproposal[PROPOSAL_ENC_ALGS_STOC] =
1.284 djm 167: compat_cipher_proposal(options.ciphers);
1.245 dtucker 168: myproposal[PROPOSAL_COMP_ALGS_CTOS] =
169: myproposal[PROPOSAL_COMP_ALGS_STOC] = options.compression ?
1.277 sf 170: "zlib@openssh.com,zlib,none" : "none,zlib@openssh.com,zlib";
1.226 djm 171: myproposal[PROPOSAL_MAC_ALGS_CTOS] =
172: myproposal[PROPOSAL_MAC_ALGS_STOC] = options.macs;
173: if (options.hostkeyalgorithms != NULL) {
1.275 djm 174: all_key = sshkey_alg_list(0, 0, 1, ',');
175: if (kex_assemble_names(&options.hostkeyalgorithms,
176: KEX_DEFAULT_PK_ALG, all_key) != 0)
1.226 djm 177: fatal("%s: kex_assemble_namelist", __func__);
1.275 djm 178: free(all_key);
1.88 deraadt 179: myproposal[PROPOSAL_SERVER_HOST_KEY_ALGS] =
1.284 djm 180: compat_pkalg_proposal(options.hostkeyalgorithms);
1.226 djm 181: } else {
1.225 markus 182: /* Enforce default */
183: options.hostkeyalgorithms = xstrdup(KEX_DEFAULT_PK_ALG);
1.186 djm 184: /* Prefer algorithms that we already have keys for */
185: myproposal[PROPOSAL_SERVER_HOST_KEY_ALGS] =
1.200 djm 186: compat_pkalg_proposal(
1.284 djm 187: order_hostkeyalgs(host, hostaddr, port));
1.186 djm 188: }
1.115 markus 189:
1.196 dtucker 190: if (options.rekey_limit || options.rekey_interval)
1.294 djm 191: ssh_packet_set_rekey_limits(ssh, options.rekey_limit,
1.254 dtucker 192: options.rekey_interval);
1.22 provos 193:
1.65 markus 194: /* start key exchange */
1.291 djm 195: if ((r = kex_setup(ssh, myproposal)) != 0)
1.221 markus 196: fatal("kex_setup: %s", ssh_err(r));
1.207 markus 197: #ifdef WITH_OPENSSL
1.299 djm 198: ssh->kex->kex[KEX_DH_GRP1_SHA1] = kex_kem_client;
199: ssh->kex->kex[KEX_DH_GRP14_SHA1] = kex_kem_client;
200: ssh->kex->kex[KEX_DH_GRP14_SHA256] = kex_kem_client;
201: ssh->kex->kex[KEX_DH_GRP16_SHA512] = kex_kem_client;
202: ssh->kex->kex[KEX_DH_GRP18_SHA512] = kex_kem_client;
1.291 djm 203: ssh->kex->kex[KEX_DH_GEX_SHA1] = kexgex_client;
204: ssh->kex->kex[KEX_DH_GEX_SHA256] = kexgex_client;
1.300 ! djm 205: ssh->kex->kex[KEX_ECDH_SHA2] = kex_kem_client;
1.207 markus 206: #endif
1.298 djm 207: ssh->kex->kex[KEX_C25519_SHA256] = kex_kem_client;
1.297 djm 208: ssh->kex->kex[KEX_KEM_SNTRUP4591761X25519_SHA512] = kex_kem_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;
1.68 markus 260: /* pubkey */
1.214 djm 261: struct idlist keys;
262: int agent_fd;
1.68 markus 263: /* hostbased */
1.100 markus 264: Sensitive *sensitive;
1.223 djm 265: char *oktypes, *ktypes;
266: const char *active_ktype;
1.82 markus 267: /* kbd-interactive */
268: int info_req_seen;
1.292 djm 269: int attempt_kbdint;
270: /* password */
271: int attempt_passwd;
1.121 markus 272: /* generic */
273: void *methoddata;
1.20 markus 274: };
1.214 djm 275:
276: struct cauthmethod {
1.20 markus 277: char *name; /* string to compare against server's list */
1.295 djm 278: int (*userauth)(struct ssh *ssh);
279: void (*cleanup)(struct ssh *ssh);
1.20 markus 280: int *enabled; /* flag in option struct that enables method */
281: int *batch_flag; /* flag in option struct that disables method */
282: };
283:
1.261 markus 284: int input_userauth_service_accept(int, u_int32_t, struct ssh *);
285: int input_userauth_ext_info(int, u_int32_t, struct ssh *);
286: int input_userauth_success(int, u_int32_t, struct ssh *);
287: int input_userauth_success_unexpected(int, u_int32_t, struct ssh *);
288: int input_userauth_failure(int, u_int32_t, struct ssh *);
289: int input_userauth_banner(int, u_int32_t, struct ssh *);
290: int input_userauth_error(int, u_int32_t, struct ssh *);
291: int input_userauth_info_req(int, u_int32_t, struct ssh *);
292: int input_userauth_pk_ok(int, u_int32_t, struct ssh *);
293: int input_userauth_passwd_changereq(int, u_int32_t, struct ssh *);
1.86 itojun 294:
1.295 djm 295: int userauth_none(struct ssh *);
296: int userauth_pubkey(struct ssh *);
297: int userauth_passwd(struct ssh *);
298: int userauth_kbdint(struct ssh *);
299: int userauth_hostbased(struct ssh *);
1.20 markus 300:
1.121 markus 301: #ifdef GSSAPI
1.295 djm 302: int userauth_gssapi(struct ssh *);
1.261 markus 303: int input_gssapi_response(int type, u_int32_t, struct ssh *);
304: int input_gssapi_token(int type, u_int32_t, struct ssh *);
305: int input_gssapi_hash(int type, u_int32_t, struct ssh *);
306: int input_gssapi_error(int, u_int32_t, struct ssh *);
307: int input_gssapi_errtok(int, u_int32_t, struct ssh *);
1.121 markus 308: #endif
309:
1.295 djm 310: void userauth(struct ssh *, char *);
1.51 markus 311:
1.295 djm 312: static int sign_and_send_pubkey(struct ssh *ssh, Identity *);
1.117 markus 313: static void pubkey_prepare(Authctxt *);
314: static void pubkey_cleanup(Authctxt *);
1.251 djm 315: static void pubkey_reset(Authctxt *);
1.259 markus 316: static struct sshkey *load_identity_file(Identity *);
1.76 itojun 317:
318: static Authmethod *authmethod_get(char *authlist);
319: static Authmethod *authmethod_lookup(const char *name);
320: static char *authmethods_get(void);
1.20 markus 321:
322: Authmethod authmethods[] = {
1.121 markus 323: #ifdef GSSAPI
1.132 markus 324: {"gssapi-with-mic",
1.121 markus 325: userauth_gssapi,
1.170 djm 326: NULL,
1.121 markus 327: &options.gss_authentication,
328: NULL},
329: #endif
1.81 markus 330: {"hostbased",
331: userauth_hostbased,
1.170 djm 332: NULL,
1.81 markus 333: &options.hostbased_authentication,
334: NULL},
1.20 markus 335: {"publickey",
336: userauth_pubkey,
1.170 djm 337: NULL,
1.28 markus 338: &options.pubkey_authentication,
1.20 markus 339: NULL},
1.81 markus 340: {"keyboard-interactive",
341: userauth_kbdint,
1.170 djm 342: NULL,
1.81 markus 343: &options.kbd_interactive_authentication,
344: &options.batch_mode},
1.20 markus 345: {"password",
346: userauth_passwd,
1.170 djm 347: NULL,
1.20 markus 348: &options.password_authentication,
1.23 markus 349: &options.batch_mode},
350: {"none",
351: userauth_none,
352: NULL,
1.170 djm 353: NULL,
1.23 markus 354: NULL},
1.170 djm 355: {NULL, NULL, NULL, NULL, NULL}
1.20 markus 356: };
357:
358: void
1.291 djm 359: ssh_userauth2(struct ssh *ssh, const char *local_user,
360: const char *server_user, char *host, Sensitive *sensitive)
1.20 markus 361: {
362: Authctxt authctxt;
1.231 markus 363: int r;
1.39 markus 364:
1.73 markus 365: if (options.challenge_response_authentication)
1.39 markus 366: options.kbd_interactive_authentication = 1;
1.53 markus 367: if (options.preferred_authentications == NULL)
368: options.preferred_authentications = authmethods_get();
369:
1.20 markus 370: /* setup authentication context */
1.82 markus 371: memset(&authctxt, 0, sizeof(authctxt));
1.20 markus 372: authctxt.server_user = server_user;
1.68 markus 373: authctxt.local_user = local_user;
1.20 markus 374: authctxt.host = host;
375: authctxt.service = "ssh-connection"; /* service name */
376: authctxt.success = 0;
1.23 markus 377: authctxt.method = authmethod_lookup("none");
1.51 markus 378: authctxt.authlist = NULL;
1.121 markus 379: authctxt.methoddata = NULL;
1.100 markus 380: authctxt.sensitive = sensitive;
1.223 djm 381: authctxt.active_ktype = authctxt.oktypes = authctxt.ktypes = NULL;
1.82 markus 382: authctxt.info_req_seen = 0;
1.292 djm 383: authctxt.attempt_kbdint = 0;
384: authctxt.attempt_passwd = 0;
1.215 djm 385: authctxt.agent_fd = -1;
1.289 djm 386: pubkey_prepare(&authctxt);
1.291 djm 387: if (authctxt.method == NULL) {
388: fatal("%s: internal error: cannot send userauth none request",
389: __func__);
390: }
1.20 markus 391:
1.231 markus 392: if ((r = sshpkt_start(ssh, SSH2_MSG_SERVICE_REQUEST)) != 0 ||
393: (r = sshpkt_put_cstring(ssh, "ssh-userauth")) != 0 ||
394: (r = sshpkt_send(ssh)) != 0)
395: fatal("%s: %s", __func__, ssh_err(r));
396:
1.260 markus 397: ssh->authctxt = &authctxt;
1.231 markus 398: ssh_dispatch_init(ssh, &input_userauth_error);
399: ssh_dispatch_set(ssh, SSH2_MSG_EXT_INFO, &input_userauth_ext_info);
400: ssh_dispatch_set(ssh, SSH2_MSG_SERVICE_ACCEPT, &input_userauth_service_accept);
1.263 markus 401: ssh_dispatch_run_fatal(ssh, DISPATCH_BLOCK, &authctxt.success); /* loop until success */
1.260 markus 402: ssh->authctxt = NULL;
1.20 markus 403:
1.117 markus 404: pubkey_cleanup(&authctxt);
1.231 markus 405: ssh_dispatch_range(ssh, SSH2_MSG_USERAUTH_MIN, SSH2_MSG_USERAUTH_MAX, NULL);
1.119 markus 406:
1.248 dtucker 407: if (!authctxt.success)
408: fatal("Authentication failed.");
1.109 markus 409: debug("Authentication succeeded (%s).", authctxt.method->name);
1.20 markus 410: }
1.119 markus 411:
1.231 markus 412: /* ARGSUSED */
413: int
1.261 markus 414: input_userauth_service_accept(int type, u_int32_t seq, struct ssh *ssh)
1.231 markus 415: {
416: int r;
417:
418: if (ssh_packet_remaining(ssh) > 0) {
419: char *reply;
420:
421: if ((r = sshpkt_get_cstring(ssh, &reply, NULL)) != 0)
422: goto out;
423: debug2("service_accept: %s", reply);
424: free(reply);
425: } else {
426: debug2("buggy server: service_accept w/o service");
427: }
428: if ((r = sshpkt_get_end(ssh)) != 0)
429: goto out;
430: debug("SSH2_MSG_SERVICE_ACCEPT received");
431:
432: /* initial userauth request */
1.295 djm 433: userauth_none(ssh);
1.231 markus 434:
435: ssh_dispatch_set(ssh, SSH2_MSG_EXT_INFO, &input_userauth_error);
436: ssh_dispatch_set(ssh, SSH2_MSG_USERAUTH_SUCCESS, &input_userauth_success);
437: ssh_dispatch_set(ssh, SSH2_MSG_USERAUTH_FAILURE, &input_userauth_failure);
438: ssh_dispatch_set(ssh, SSH2_MSG_USERAUTH_BANNER, &input_userauth_banner);
439: r = 0;
440: out:
441: return r;
442: }
443:
444: /* ARGSUSED */
445: int
1.261 markus 446: input_userauth_ext_info(int type, u_int32_t seqnr, struct ssh *ssh)
1.231 markus 447: {
1.261 markus 448: return kex_input_ext_info(type, seqnr, ssh);
1.231 markus 449: }
450:
1.20 markus 451: void
1.295 djm 452: userauth(struct ssh *ssh, char *authlist)
1.51 markus 453: {
1.295 djm 454: Authctxt *authctxt = (Authctxt *)ssh->authctxt;
1.278 markus 455:
1.170 djm 456: if (authctxt->method != NULL && authctxt->method->cleanup != NULL)
1.295 djm 457: authctxt->method->cleanup(ssh);
1.170 djm 458:
1.197 djm 459: free(authctxt->methoddata);
460: authctxt->methoddata = NULL;
1.51 markus 461: if (authlist == NULL) {
462: authlist = authctxt->authlist;
463: } else {
1.197 djm 464: free(authctxt->authlist);
1.51 markus 465: authctxt->authlist = authlist;
466: }
467: for (;;) {
468: Authmethod *method = authmethod_get(authlist);
469: if (method == NULL)
1.264 dtucker 470: fatal("%s@%s: Permission denied (%s).",
471: authctxt->server_user, authctxt->host, authlist);
1.51 markus 472: authctxt->method = method;
1.119 markus 473:
474: /* reset the per method handler */
1.278 markus 475: ssh_dispatch_range(ssh, SSH2_MSG_USERAUTH_PER_METHOD_MIN,
1.119 markus 476: SSH2_MSG_USERAUTH_PER_METHOD_MAX, NULL);
477:
478: /* and try new method */
1.295 djm 479: if (method->userauth(ssh) != 0) {
1.51 markus 480: debug2("we sent a %s packet, wait for reply", method->name);
481: break;
482: } else {
483: debug2("we did not send a packet, disable method");
484: method->enabled = NULL;
485: }
486: }
487: }
1.105 deraadt 488:
1.169 djm 489: /* ARGSUSED */
1.218 markus 490: int
1.261 markus 491: input_userauth_error(int type, u_int32_t seq, struct ssh *ssh)
1.20 markus 492: {
1.295 djm 493: fatal("%s: bad message during authentication: type %d", __func__, type);
1.218 markus 494: return 0;
1.35 markus 495: }
1.105 deraadt 496:
1.169 djm 497: /* ARGSUSED */
1.218 markus 498: int
1.261 markus 499: input_userauth_banner(int type, u_int32_t seq, struct ssh *ssh)
1.35 markus 500: {
1.295 djm 501: char *msg = NULL;
1.294 djm 502: size_t len;
503: int r;
1.126 deraadt 504:
1.246 djm 505: debug3("%s", __func__);
1.294 djm 506: if ((r = sshpkt_get_cstring(ssh, &msg, &len)) != 0 ||
1.295 djm 507: (r = sshpkt_get_cstring(ssh, NULL, NULL)) != 0)
1.294 djm 508: goto out;
1.246 djm 509: if (len > 0 && options.log_level >= SYSLOG_LEVEL_INFO)
510: fmprintf(stderr, "%s", msg);
1.294 djm 511: r = 0;
512: out:
1.246 djm 513: free(msg);
1.294 djm 514: return r;
1.20 markus 515: }
1.105 deraadt 516:
1.169 djm 517: /* ARGSUSED */
1.218 markus 518: int
1.261 markus 519: input_userauth_success(int type, u_int32_t seq, struct ssh *ssh)
1.20 markus 520: {
1.260 markus 521: Authctxt *authctxt = ssh->authctxt;
1.172 djm 522:
1.20 markus 523: if (authctxt == NULL)
1.295 djm 524: fatal("%s: no authentication context", __func__);
1.197 djm 525: free(authctxt->authlist);
526: authctxt->authlist = NULL;
1.172 djm 527: if (authctxt->method != NULL && authctxt->method->cleanup != NULL)
1.295 djm 528: authctxt->method->cleanup(ssh);
1.197 djm 529: free(authctxt->methoddata);
530: authctxt->methoddata = NULL;
1.20 markus 531: authctxt->success = 1; /* break out */
1.218 markus 532: return 0;
1.20 markus 533: }
1.105 deraadt 534:
1.218 markus 535: int
1.261 markus 536: input_userauth_success_unexpected(int type, u_int32_t seq, struct ssh *ssh)
1.172 djm 537: {
1.260 markus 538: Authctxt *authctxt = ssh->authctxt;
1.172 djm 539:
540: if (authctxt == NULL)
541: fatal("%s: no authentication context", __func__);
542:
543: fatal("Unexpected authentication success during %s.",
544: authctxt->method->name);
1.218 markus 545: return 0;
1.172 djm 546: }
547:
1.169 djm 548: /* ARGSUSED */
1.218 markus 549: int
1.261 markus 550: input_userauth_failure(int type, u_int32_t seq, struct ssh *ssh)
1.20 markus 551: {
1.260 markus 552: Authctxt *authctxt = ssh->authctxt;
1.20 markus 553: char *authlist = NULL;
1.278 markus 554: u_char partial;
555: int r;
1.20 markus 556:
557: if (authctxt == NULL)
558: fatal("input_userauth_failure: no authentication context");
559:
1.278 markus 560: if ((r = sshpkt_get_cstring(ssh, &authlist, NULL)) != 0 ||
561: (r = sshpkt_get_u8(ssh, &partial)) != 0 ||
562: (r = sshpkt_get_end(ssh)) != 0)
563: goto out;
1.20 markus 564:
1.193 markus 565: if (partial != 0) {
1.247 dtucker 566: verbose("Authenticated with partial success.");
1.193 markus 567: /* reset state */
1.251 djm 568: pubkey_reset(authctxt);
1.193 markus 569: }
1.109 markus 570: debug("Authentications that can continue: %s", authlist);
1.20 markus 571:
1.295 djm 572: userauth(ssh, authlist);
1.278 markus 573: authlist = NULL;
574: out:
575: free(authlist);
1.218 markus 576: return 0;
1.51 markus 577: }
1.169 djm 578:
1.287 djm 579: /*
580: * Format an identity for logging including filename, key type, fingerprint
581: * and location (agent, etc.). Caller must free.
582: */
583: static char *
584: format_identity(Identity *id)
585: {
586: char *fp = NULL, *ret = NULL;
587:
588: if (id->key != NULL) {
589: fp = sshkey_fingerprint(id->key, options.fingerprint_hash,
590: SSH_FP_DEFAULT);
591: }
592: xasprintf(&ret, "%s %s%s%s%s%s%s",
593: id->filename,
594: id->key ? sshkey_type(id->key) : "", id->key ? " " : "",
595: fp ? fp : "",
596: id->userprovided ? " explicit" : "",
597: (id->key && (id->key->flags & SSHKEY_FLAG_EXT)) ? " token" : "",
598: id->agent_fd != -1 ? " agent" : "");
599: free(fp);
600: return ret;
601: }
602:
1.169 djm 603: /* ARGSUSED */
1.218 markus 604: int
1.261 markus 605: input_userauth_pk_ok(int type, u_int32_t seq, struct ssh *ssh)
1.51 markus 606: {
1.260 markus 607: Authctxt *authctxt = ssh->authctxt;
1.259 markus 608: struct sshkey *key = NULL;
1.117 markus 609: Identity *id = NULL;
1.287 djm 610: int pktype, found = 0, sent = 0;
1.278 markus 611: size_t blen;
1.287 djm 612: char *pkalg = NULL, *fp = NULL, *ident = NULL;
1.278 markus 613: u_char *pkblob = NULL;
614: int r;
1.51 markus 615:
616: if (authctxt == NULL)
617: fatal("input_userauth_pk_ok: no authentication context");
1.267 djm 618:
1.278 markus 619: if ((r = sshpkt_get_cstring(ssh, &pkalg, NULL)) != 0 ||
620: (r = sshpkt_get_string(ssh, &pkblob, &blen)) != 0 ||
621: (r = sshpkt_get_end(ssh)) != 0)
622: goto done;
1.51 markus 623:
1.278 markus 624: if ((pktype = sshkey_type_from_name(pkalg)) == KEY_UNSPEC) {
1.287 djm 625: debug("%s: server sent unknown pkalg %s", __func__, pkalg);
1.117 markus 626: goto done;
627: }
1.278 markus 628: if ((r = sshkey_from_blob(pkblob, blen, &key)) != 0) {
629: debug("no key from blob. pkalg %s: %s", pkalg, ssh_err(r));
1.117 markus 630: goto done;
631: }
632: if (key->type != pktype) {
633: error("input_userauth_pk_ok: type mismatch "
634: "for decoded key (received %d, expected %d)",
635: key->type, pktype);
636: goto done;
637: }
638:
1.127 markus 639: /*
640: * search keys in the reverse order, because last candidate has been
641: * moved to the end of the queue. this also avoids confusion by
642: * duplicate keys
643: */
1.136 henning 644: TAILQ_FOREACH_REVERSE(id, &authctxt->keys, idlist, next) {
1.278 markus 645: if (sshkey_equal(key, id->key)) {
1.287 djm 646: found = 1;
1.51 markus 647: break;
648: }
1.117 markus 649: }
1.287 djm 650: if (!found || id == NULL) {
651: fp = sshkey_fingerprint(key, options.fingerprint_hash,
652: SSH_FP_DEFAULT);
653: error("%s: server replied with unknown key: %s %s", __func__,
654: sshkey_type(key), fp == NULL ? "<ERROR>" : fp);
655: goto done;
656: }
657: ident = format_identity(id);
658: debug("Server accepts key: %s", ident);
1.295 djm 659: sent = sign_and_send_pubkey(ssh, id);
1.278 markus 660: r = 0;
661: done:
662: sshkey_free(key);
1.287 djm 663: free(ident);
664: free(fp);
1.197 djm 665: free(pkalg);
666: free(pkblob);
1.51 markus 667:
1.106 deraadt 668: /* try another method if we did not send a packet */
1.278 markus 669: if (r == 0 && sent == 0)
1.295 djm 670: userauth(ssh, NULL);
1.278 markus 671: return r;
1.20 markus 672: }
1.121 markus 673:
674: #ifdef GSSAPI
1.133 djm 675: int
1.295 djm 676: userauth_gssapi(struct ssh *ssh)
1.121 markus 677: {
1.295 djm 678: Authctxt *authctxt = (Authctxt *)ssh->authctxt;
1.121 markus 679: Gssctxt *gssctxt = NULL;
1.128 avsm 680: static gss_OID_set gss_supported = NULL;
1.139 djm 681: static u_int mech = 0;
1.121 markus 682: OM_uint32 min;
1.278 markus 683: int r, ok = 0;
1.121 markus 684:
685: /* Try one GSSAPI method at a time, rather than sending them all at
686: * once. */
687:
1.128 avsm 688: if (gss_supported == NULL)
689: gss_indicate_mechs(&min, &gss_supported);
1.121 markus 690:
691: /* Check to see if the mechanism is usable before we offer it */
1.128 avsm 692: while (mech < gss_supported->count && !ok) {
1.121 markus 693: /* My DER encoding requires length<128 */
1.128 avsm 694: if (gss_supported->elements[mech].length < 128 &&
1.271 djm 695: ssh_gssapi_check_mechanism(&gssctxt,
1.161 djm 696: &gss_supported->elements[mech], authctxt->host)) {
1.121 markus 697: ok = 1; /* Mechanism works */
698: } else {
699: mech++;
700: }
701: }
702:
1.161 djm 703: if (!ok)
1.139 djm 704: return 0;
1.121 markus 705:
706: authctxt->methoddata=(void *)gssctxt;
707:
1.278 markus 708: if ((r = sshpkt_start(ssh, SSH2_MSG_USERAUTH_REQUEST)) != 0 ||
709: (r = sshpkt_put_cstring(ssh, authctxt->server_user)) != 0 ||
710: (r = sshpkt_put_cstring(ssh, authctxt->service)) != 0 ||
711: (r = sshpkt_put_cstring(ssh, authctxt->method->name)) != 0 ||
712: (r = sshpkt_put_u32(ssh, 1)) != 0 ||
713: (r = sshpkt_put_u32(ssh,
714: (gss_supported->elements[mech].length) + 2)) != 0 ||
715: (r = sshpkt_put_u8(ssh, SSH_GSS_OIDTYPE)) != 0 ||
716: (r = sshpkt_put_u8(ssh,
717: gss_supported->elements[mech].length)) != 0 ||
718: (r = sshpkt_put(ssh,
719: gss_supported->elements[mech].elements,
720: gss_supported->elements[mech].length)) != 0 ||
721: (r = sshpkt_send(ssh)) != 0)
722: fatal("%s: %s", __func__, ssh_err(r));
723:
724: ssh_dispatch_set(ssh, SSH2_MSG_USERAUTH_GSSAPI_RESPONSE, &input_gssapi_response);
725: ssh_dispatch_set(ssh, SSH2_MSG_USERAUTH_GSSAPI_TOKEN, &input_gssapi_token);
726: ssh_dispatch_set(ssh, SSH2_MSG_USERAUTH_GSSAPI_ERROR, &input_gssapi_error);
727: ssh_dispatch_set(ssh, SSH2_MSG_USERAUTH_GSSAPI_ERRTOK, &input_gssapi_errtok);
1.121 markus 728:
729: mech++; /* Move along to next candidate */
730:
731: return 1;
732: }
733:
1.130 markus 734: static OM_uint32
1.262 djm 735: process_gssapi_token(struct ssh *ssh, gss_buffer_t recv_tok)
1.130 markus 736: {
1.260 markus 737: Authctxt *authctxt = ssh->authctxt;
1.130 markus 738: Gssctxt *gssctxt = authctxt->methoddata;
739: gss_buffer_desc send_tok = GSS_C_EMPTY_BUFFER;
1.142 djm 740: gss_buffer_desc mic = GSS_C_EMPTY_BUFFER;
741: gss_buffer_desc gssbuf;
1.132 markus 742: OM_uint32 status, ms, flags;
1.278 markus 743: int r;
1.133 djm 744:
1.130 markus 745: status = ssh_gssapi_init_ctx(gssctxt, options.gss_deleg_creds,
1.132 markus 746: recv_tok, &send_tok, &flags);
1.130 markus 747:
748: if (send_tok.length > 0) {
1.278 markus 749: u_char type = GSS_ERROR(status) ?
750: SSH2_MSG_USERAUTH_GSSAPI_ERRTOK :
751: SSH2_MSG_USERAUTH_GSSAPI_TOKEN;
752:
753: if ((r = sshpkt_start(ssh, type)) != 0 ||
754: (r = sshpkt_put_string(ssh, send_tok.value,
755: send_tok.length)) != 0 ||
756: (r = sshpkt_send(ssh)) != 0)
757: fatal("%s: %s", __func__, ssh_err(r));
1.133 djm 758:
1.130 markus 759: gss_release_buffer(&ms, &send_tok);
760: }
1.133 djm 761:
1.130 markus 762: if (status == GSS_S_COMPLETE) {
1.132 markus 763: /* send either complete or MIC, depending on mechanism */
764: if (!(flags & GSS_C_INTEG_FLAG)) {
1.278 markus 765: if ((r = sshpkt_start(ssh,
766: SSH2_MSG_USERAUTH_GSSAPI_EXCHANGE_COMPLETE)) != 0 ||
767: (r = sshpkt_send(ssh)) != 0)
768: fatal("%s: %s", __func__, ssh_err(r));
1.132 markus 769: } else {
1.278 markus 770: struct sshbuf *b;
771:
772: if ((b = sshbuf_new()) == NULL)
773: fatal("%s: sshbuf_new failed", __func__);
774: ssh_gssapi_buildmic(b, authctxt->server_user,
1.132 markus 775: authctxt->service, "gssapi-with-mic");
776:
1.278 markus 777: if ((gssbuf.value = sshbuf_mutable_ptr(b)) == NULL)
778: fatal("%s: sshbuf_mutable_ptr failed", __func__);
779: gssbuf.length = sshbuf_len(b);
1.133 djm 780:
1.132 markus 781: status = ssh_gssapi_sign(gssctxt, &gssbuf, &mic);
1.133 djm 782:
1.132 markus 783: if (!GSS_ERROR(status)) {
1.278 markus 784: if ((r = sshpkt_start(ssh,
785: SSH2_MSG_USERAUTH_GSSAPI_MIC)) != 0 ||
786: (r = sshpkt_put_string(ssh, mic.value,
787: mic.length)) != 0 ||
788: (r = sshpkt_send(ssh)) != 0)
789: fatal("%s: %s", __func__, ssh_err(r));
1.132 markus 790: }
1.133 djm 791:
1.278 markus 792: sshbuf_free(b);
1.132 markus 793: gss_release_buffer(&ms, &mic);
1.133 djm 794: }
1.130 markus 795: }
1.133 djm 796:
1.130 markus 797: return status;
798: }
799:
1.169 djm 800: /* ARGSUSED */
1.220 djm 801: int
1.261 markus 802: input_gssapi_response(int type, u_int32_t plen, struct ssh *ssh)
1.121 markus 803: {
1.260 markus 804: Authctxt *authctxt = ssh->authctxt;
1.121 markus 805: Gssctxt *gssctxt;
1.278 markus 806: size_t oidlen;
807: u_char *oidv = NULL;
808: int r;
1.121 markus 809:
810: if (authctxt == NULL)
811: fatal("input_gssapi_response: no authentication context");
812: gssctxt = authctxt->methoddata;
813:
814: /* Setup our OID */
1.278 markus 815: if ((r = sshpkt_get_string(ssh, &oidv, &oidlen)) != 0)
816: goto done;
1.121 markus 817:
1.129 markus 818: if (oidlen <= 2 ||
819: oidv[0] != SSH_GSS_OIDTYPE ||
820: oidv[1] != oidlen - 2) {
821: debug("Badly encoded mechanism OID received");
1.296 djm 822: userauth(ssh, NULL);
1.278 markus 823: goto ok;
1.121 markus 824: }
1.129 markus 825:
826: if (!ssh_gssapi_check_oid(gssctxt, oidv + 2, oidlen - 2))
827: fatal("Server returned different OID than expected");
1.121 markus 828:
1.278 markus 829: if ((r = sshpkt_get_end(ssh)) != 0)
830: goto done;
1.121 markus 831:
1.262 djm 832: if (GSS_ERROR(process_gssapi_token(ssh, GSS_C_NO_BUFFER))) {
1.121 markus 833: /* Start again with next method on list */
834: debug("Trying to start again");
1.296 djm 835: userauth(ssh, NULL);
1.278 markus 836: goto ok;
1.121 markus 837: }
1.278 markus 838: ok:
839: r = 0;
840: done:
841: free(oidv);
842: return r;
1.121 markus 843: }
844:
1.169 djm 845: /* ARGSUSED */
1.220 djm 846: int
1.261 markus 847: input_gssapi_token(int type, u_int32_t plen, struct ssh *ssh)
1.121 markus 848: {
1.260 markus 849: Authctxt *authctxt = ssh->authctxt;
1.121 markus 850: gss_buffer_desc recv_tok;
1.278 markus 851: u_char *p = NULL;
852: size_t len;
1.130 markus 853: OM_uint32 status;
1.278 markus 854: int r;
1.121 markus 855:
856: if (authctxt == NULL)
857: fatal("input_gssapi_response: no authentication context");
858:
1.278 markus 859: if ((r = sshpkt_get_string(ssh, &p, &len)) != 0 ||
860: (r = sshpkt_get_end(ssh)) != 0)
861: goto out;
1.121 markus 862:
1.278 markus 863: recv_tok.value = p;
864: recv_tok.length = len;
1.262 djm 865: status = process_gssapi_token(ssh, &recv_tok);
1.121 markus 866:
1.278 markus 867: /* Start again with the next method in the list */
1.121 markus 868: if (GSS_ERROR(status)) {
1.296 djm 869: userauth(ssh, NULL);
1.278 markus 870: /* ok */
1.121 markus 871: }
1.278 markus 872: r = 0;
873: out:
874: free(p);
875: return r;
1.121 markus 876: }
877:
1.169 djm 878: /* ARGSUSED */
1.220 djm 879: int
1.261 markus 880: input_gssapi_errtok(int type, u_int32_t plen, struct ssh *ssh)
1.121 markus 881: {
1.260 markus 882: Authctxt *authctxt = ssh->authctxt;
1.121 markus 883: Gssctxt *gssctxt;
884: gss_buffer_desc send_tok = GSS_C_EMPTY_BUFFER;
885: gss_buffer_desc recv_tok;
1.194 djm 886: OM_uint32 ms;
1.278 markus 887: u_char *p = NULL;
888: size_t len;
889: int r;
1.121 markus 890:
891: if (authctxt == NULL)
892: fatal("input_gssapi_response: no authentication context");
893: gssctxt = authctxt->methoddata;
894:
1.278 markus 895: if ((r = sshpkt_get_string(ssh, &p, &len)) != 0 ||
896: (r = sshpkt_get_end(ssh)) != 0) {
897: free(p);
898: return r;
899: }
1.121 markus 900:
901: /* Stick it into GSSAPI and see what it says */
1.278 markus 902: recv_tok.value = p;
903: recv_tok.length = len;
1.194 djm 904: (void)ssh_gssapi_init_ctx(gssctxt, options.gss_deleg_creds,
1.140 djm 905: &recv_tok, &send_tok, NULL);
1.278 markus 906: free(p);
1.121 markus 907: gss_release_buffer(&ms, &send_tok);
908:
909: /* Server will be returning a failed packet after this one */
1.220 djm 910: return 0;
1.121 markus 911: }
912:
1.169 djm 913: /* ARGSUSED */
1.220 djm 914: int
1.261 markus 915: input_gssapi_error(int type, u_int32_t plen, struct ssh *ssh)
1.121 markus 916: {
1.278 markus 917: char *msg = NULL;
918: char *lang = NULL;
919: int r;
1.121 markus 920:
1.278 markus 921: if ((r = sshpkt_get_u32(ssh, NULL)) != 0 || /* maj */
922: (r = sshpkt_get_u32(ssh, NULL)) != 0 || /* min */
923: (r = sshpkt_get_cstring(ssh, &msg, NULL)) != 0 ||
924: (r = sshpkt_get_cstring(ssh, &lang, NULL)) != 0)
925: goto out;
926: r = sshpkt_get_end(ssh);
1.143 stevesk 927: debug("Server GSSAPI Error:\n%s", msg);
1.278 markus 928: out:
1.197 djm 929: free(msg);
930: free(lang);
1.278 markus 931: return r;
1.121 markus 932: }
933: #endif /* GSSAPI */
1.20 markus 934:
1.1 markus 935: int
1.295 djm 936: userauth_none(struct ssh *ssh)
1.23 markus 937: {
1.295 djm 938: Authctxt *authctxt = (Authctxt *)ssh->authctxt;
1.278 markus 939: int r;
940:
1.23 markus 941: /* initial userauth request */
1.278 markus 942: if ((r = sshpkt_start(ssh, SSH2_MSG_USERAUTH_REQUEST)) != 0 ||
943: (r = sshpkt_put_cstring(ssh, authctxt->server_user)) != 0 ||
944: (r = sshpkt_put_cstring(ssh, authctxt->service)) != 0 ||
945: (r = sshpkt_put_cstring(ssh, authctxt->method->name)) != 0 ||
946: (r = sshpkt_send(ssh)) != 0)
947: fatal("%s: %s", __func__, ssh_err(r));
1.23 markus 948: return 1;
949: }
950:
951: int
1.295 djm 952: userauth_passwd(struct ssh *ssh)
1.1 markus 953: {
1.295 djm 954: Authctxt *authctxt = (Authctxt *)ssh->authctxt;
1.290 djm 955: char *password, *prompt = NULL;
1.175 dtucker 956: const char *host = options.host_key_alias ? options.host_key_alias :
957: authctxt->host;
1.278 markus 958: int r;
1.6 markus 959:
1.292 djm 960: if (authctxt->attempt_passwd++ >= options.number_of_password_prompts)
1.6 markus 961: return 0;
1.13 todd 962:
1.292 djm 963: if (authctxt->attempt_passwd != 1)
1.13 todd 964: error("Permission denied, please try again.");
1.1 markus 965:
1.290 djm 966: xasprintf(&prompt, "%s@%s's password: ", authctxt->server_user, host);
1.1 markus 967: password = read_passphrase(prompt, 0);
1.278 markus 968: if ((r = sshpkt_start(ssh, SSH2_MSG_USERAUTH_REQUEST)) != 0 ||
969: (r = sshpkt_put_cstring(ssh, authctxt->server_user)) != 0 ||
970: (r = sshpkt_put_cstring(ssh, authctxt->service)) != 0 ||
971: (r = sshpkt_put_cstring(ssh, authctxt->method->name)) != 0 ||
972: (r = sshpkt_put_u8(ssh, 0)) != 0 ||
973: (r = sshpkt_put_cstring(ssh, password)) != 0 ||
974: (r = sshpkt_add_padding(ssh, 64)) != 0 ||
975: (r = sshpkt_send(ssh)) != 0)
976: fatal("%s: %s", __func__, ssh_err(r));
1.99 markus 977:
1.290 djm 978: free(prompt);
979: if (password != NULL)
1.278 markus 980: freezero(password, strlen(password));
981:
982: ssh_dispatch_set(ssh, SSH2_MSG_USERAUTH_PASSWD_CHANGEREQ,
1.99 markus 983: &input_userauth_passwd_changereq);
984:
1.1 markus 985: return 1;
986: }
1.169 djm 987:
1.99 markus 988: /*
989: * parse PASSWD_CHANGEREQ, prompt user and send SSH2_MSG_USERAUTH_REQUEST
990: */
1.169 djm 991: /* ARGSUSED */
1.218 markus 992: int
1.261 markus 993: input_userauth_passwd_changereq(int type, u_int32_t seqnr, struct ssh *ssh)
1.99 markus 994: {
1.260 markus 995: Authctxt *authctxt = ssh->authctxt;
1.278 markus 996: char *info = NULL, *lang = NULL, *password = NULL, *retype = NULL;
1.266 dtucker 997: char prompt[256];
1.252 djm 998: const char *host;
1.278 markus 999: int r;
1.99 markus 1000:
1001: debug2("input_userauth_passwd_changereq");
1002:
1003: if (authctxt == NULL)
1004: fatal("input_userauth_passwd_changereq: "
1005: "no authentication context");
1.252 djm 1006: host = options.host_key_alias ? options.host_key_alias : authctxt->host;
1.99 markus 1007:
1.278 markus 1008: if ((r = sshpkt_get_cstring(ssh, &info, NULL)) != 0 ||
1009: (r = sshpkt_get_cstring(ssh, &lang, NULL)) != 0)
1010: goto out;
1.99 markus 1011: if (strlen(info) > 0)
1.116 itojun 1012: logit("%s", info);
1.278 markus 1013: if ((r = sshpkt_start(ssh, SSH2_MSG_USERAUTH_REQUEST)) != 0 ||
1014: (r = sshpkt_put_cstring(ssh, authctxt->server_user)) != 0 ||
1015: (r = sshpkt_put_cstring(ssh, authctxt->service)) != 0 ||
1016: (r = sshpkt_put_cstring(ssh, authctxt->method->name)) != 0 ||
1017: (r = sshpkt_put_u8(ssh, 1)) != 0) /* additional info */
1018: goto out;
1019:
1.104 deraadt 1020: snprintf(prompt, sizeof(prompt),
1.99 markus 1021: "Enter %.30s@%.128s's old password: ",
1.175 dtucker 1022: authctxt->server_user, host);
1.99 markus 1023: password = read_passphrase(prompt, 0);
1.278 markus 1024: if ((r = sshpkt_put_cstring(ssh, password)) != 0)
1025: goto out;
1026:
1027: freezero(password, strlen(password));
1.99 markus 1028: password = NULL;
1029: while (password == NULL) {
1.104 deraadt 1030: snprintf(prompt, sizeof(prompt),
1.99 markus 1031: "Enter %.30s@%.128s's new password: ",
1.175 dtucker 1032: authctxt->server_user, host);
1.99 markus 1033: password = read_passphrase(prompt, RP_ALLOW_EOF);
1034: if (password == NULL) {
1035: /* bail out */
1.278 markus 1036: r = 0;
1037: goto out;
1.99 markus 1038: }
1.104 deraadt 1039: snprintf(prompt, sizeof(prompt),
1.99 markus 1040: "Retype %.30s@%.128s's new password: ",
1.175 dtucker 1041: authctxt->server_user, host);
1.99 markus 1042: retype = read_passphrase(prompt, 0);
1043: if (strcmp(password, retype) != 0) {
1.278 markus 1044: freezero(password, strlen(password));
1.116 itojun 1045: logit("Mismatch; try again, EOF to quit.");
1.99 markus 1046: password = NULL;
1047: }
1.278 markus 1048: freezero(retype, strlen(retype));
1.99 markus 1049: }
1.278 markus 1050: if ((r = sshpkt_put_cstring(ssh, password)) != 0 ||
1051: (r = sshpkt_add_padding(ssh, 64)) != 0 ||
1052: (r = sshpkt_send(ssh)) != 0)
1053: goto out;
1.104 deraadt 1054:
1.278 markus 1055: ssh_dispatch_set(ssh, SSH2_MSG_USERAUTH_PASSWD_CHANGEREQ,
1.99 markus 1056: &input_userauth_passwd_changereq);
1.278 markus 1057: r = 0;
1058: out:
1059: if (password)
1060: freezero(password, strlen(password));
1061: free(info);
1062: free(lang);
1063: return r;
1.117 markus 1064: }
1065:
1.272 djm 1066: /*
1067: * Select an algorithm for publickey signatures.
1068: * Returns algorithm (caller must free) or NULL if no mutual algorithm found.
1069: *
1070: * Call with ssh==NULL to ignore server-sig-algs extension list and
1071: * only attempt with the key's base signature type.
1072: */
1073: static char *
1074: key_sig_algorithm(struct ssh *ssh, const struct sshkey *key)
1.231 markus 1075: {
1.274 djm 1076: char *allowed, *oallowed, *cp, *tmp, *alg = NULL;
1.231 markus 1077:
1.272 djm 1078: /*
1079: * The signature algorithm will only differ from the key algorithm
1080: * for RSA keys/certs and when the server advertises support for
1081: * newer (SHA2) algorithms.
1082: */
1083: if (ssh == NULL || ssh->kex->server_sig_algs == NULL ||
1.288 djm 1084: (key->type != KEY_RSA && key->type != KEY_RSA_CERT) ||
1085: (key->type == KEY_RSA_CERT && (datafellows & SSH_BUG_SIGTYPE))) {
1.272 djm 1086: /* Filter base key signature alg against our configuration */
1.279 markus 1087: return match_list(sshkey_ssh_name(key),
1.272 djm 1088: options.pubkey_key_types, NULL);
1.231 markus 1089: }
1090:
1.272 djm 1091: /*
1092: * For RSA keys/certs, since these might have a different sig type:
1093: * find the first entry in PubkeyAcceptedKeyTypes of the right type
1094: * that also appears in the supported signature algorithms list from
1095: * the server.
1096: */
1097: oallowed = allowed = xstrdup(options.pubkey_key_types);
1098: while ((cp = strsep(&allowed, ",")) != NULL) {
1099: if (sshkey_type_from_name(cp) != key->type)
1100: continue;
1.274 djm 1101: tmp = match_list(sshkey_sigalg_by_name(cp), ssh->kex->server_sig_algs, NULL);
1102: if (tmp != NULL)
1103: alg = xstrdup(cp);
1104: free(tmp);
1.272 djm 1105: if (alg != NULL)
1106: break;
1.269 djm 1107: }
1.272 djm 1108: free(oallowed);
1109: return alg;
1.269 djm 1110: }
1111:
1.117 markus 1112: static int
1.214 djm 1113: identity_sign(struct identity *id, u_char **sigp, size_t *lenp,
1.272 djm 1114: const u_char *data, size_t datalen, u_int compat, const char *alg)
1.117 markus 1115: {
1.259 markus 1116: struct sshkey *prv;
1.269 djm 1117: int r;
1.99 markus 1118:
1.272 djm 1119: /* The agent supports this key. */
1.269 djm 1120: if (id->key != NULL && id->agent_fd != -1) {
1.272 djm 1121: return ssh_agent_sign(id->agent_fd, id->key, sigp, lenp,
1122: data, datalen, alg, compat);
1.269 djm 1123: }
1.214 djm 1124:
1.117 markus 1125: /*
1.272 djm 1126: * We have already loaded the private key or the private key is
1127: * stored in external hardware.
1.117 markus 1128: */
1.255 djm 1129: if (id->key != NULL &&
1.272 djm 1130: (id->isprivate || (id->key->flags & SSHKEY_FLAG_EXT))) {
1131: if ((r = sshkey_sign(id->key, sigp, lenp, data, datalen,
1132: alg, compat)) != 0)
1133: return r;
1134: /*
1135: * PKCS#11 tokens may not support all signature algorithms,
1136: * so check what we get back.
1137: */
1138: if ((r = sshkey_check_sigtype(*sigp, *lenp, alg)) != 0)
1139: return r;
1140: return 0;
1141: }
1.255 djm 1142:
1.272 djm 1143: /* Load the private key from the file. */
1.229 jcs 1144: if ((prv = load_identity_file(id)) == NULL)
1.239 djm 1145: return SSH_ERR_KEY_NOT_FOUND;
1.265 djm 1146: if (id->key != NULL && !sshkey_equal_public(prv, id->key)) {
1147: error("%s: private key %s contents do not match public",
1148: __func__, id->filename);
1149: return SSH_ERR_KEY_NOT_FOUND;
1150: }
1.272 djm 1151: r = sshkey_sign(prv, sigp, lenp, data, datalen, alg, compat);
1.214 djm 1152: sshkey_free(prv);
1.269 djm 1153: return r;
1.51 markus 1154: }
1155:
1.76 itojun 1156: static int
1.255 djm 1157: id_filename_matches(Identity *id, Identity *private_id)
1158: {
1159: const char *suffixes[] = { ".pub", "-cert.pub", NULL };
1160: size_t len = strlen(id->filename), plen = strlen(private_id->filename);
1161: size_t i, slen;
1162:
1163: if (strcmp(id->filename, private_id->filename) == 0)
1164: return 1;
1165: for (i = 0; suffixes[i]; i++) {
1166: slen = strlen(suffixes[i]);
1167: if (len > slen && plen == len - slen &&
1168: strcmp(id->filename + (len - slen), suffixes[i]) == 0 &&
1169: memcmp(id->filename, private_id->filename, plen) == 0)
1170: return 1;
1171: }
1172: return 0;
1173: }
1174:
1175: static int
1.295 djm 1176: sign_and_send_pubkey(struct ssh *ssh, Identity *id)
1.1 markus 1177: {
1.295 djm 1178: Authctxt *authctxt = (Authctxt *)ssh->authctxt;
1.272 djm 1179: struct sshbuf *b = NULL;
1180: Identity *private_id, *sign_id = NULL;
1181: u_char *signature = NULL;
1182: size_t slen = 0, skip = 0;
1183: int r, fallback_sigtype, sent = 0;
1184: char *alg = NULL, *fp = NULL;
1185: const char *loc = "";
1.1 markus 1186:
1.222 djm 1187: if ((fp = sshkey_fingerprint(id->key, options.fingerprint_hash,
1188: SSH_FP_DEFAULT)) == NULL)
1189: return 0;
1.51 markus 1190:
1.272 djm 1191: debug3("%s: %s %s", __func__, sshkey_type(id->key), fp);
1.1 markus 1192:
1.227 djm 1193: /*
1194: * If the key is an certificate, try to find a matching private key
1195: * and use it to complete the signature.
1.241 djm 1196: * If no such private key exists, fall back to trying the certificate
1197: * key itself in case it has a private half already loaded.
1.272 djm 1198: * This will try to set sign_id to the private key that will perform
1199: * the signature.
1.227 djm 1200: */
1.272 djm 1201: if (sshkey_is_cert(id->key)) {
1.227 djm 1202: TAILQ_FOREACH(private_id, &authctxt->keys, next) {
1203: if (sshkey_equal_public(id->key, private_id->key) &&
1204: id->key->type != private_id->key->type) {
1.272 djm 1205: sign_id = private_id;
1.227 djm 1206: break;
1207: }
1208: }
1.255 djm 1209: /*
1210: * Exact key matches are preferred, but also allow
1211: * filename matches for non-PKCS#11/agent keys that
1212: * didn't load public keys. This supports the case
1213: * of keeping just a private key file and public
1214: * certificate on disk.
1215: */
1.272 djm 1216: if (sign_id == NULL &&
1217: !id->isprivate && id->agent_fd == -1 &&
1.255 djm 1218: (id->key->flags & SSHKEY_FLAG_EXT) == 0) {
1219: TAILQ_FOREACH(private_id, &authctxt->keys, next) {
1220: if (private_id->key == NULL &&
1221: id_filename_matches(id, private_id)) {
1.272 djm 1222: sign_id = private_id;
1.255 djm 1223: break;
1224: }
1225: }
1226: }
1.272 djm 1227: if (sign_id != NULL) {
1.227 djm 1228: debug2("%s: using private key \"%s\"%s for "
1229: "certificate", __func__, id->filename,
1230: id->agent_fd != -1 ? " from agent" : "");
1231: } else {
1.240 djm 1232: debug("%s: no separate private key for certificate "
1.227 djm 1233: "\"%s\"", __func__, id->filename);
1234: }
1235: }
1236:
1.272 djm 1237: /*
1238: * If the above didn't select another identity to do the signing
1239: * then default to the one we started with.
1240: */
1241: if (sign_id == NULL)
1242: sign_id = id;
1243:
1244: /* assemble and sign data */
1245: for (fallback_sigtype = 0; fallback_sigtype <= 1; fallback_sigtype++) {
1246: free(alg);
1247: slen = 0;
1248: signature = NULL;
1249: if ((alg = key_sig_algorithm(fallback_sigtype ? NULL : ssh,
1250: id->key)) == NULL) {
1251: error("%s: no mutual signature supported", __func__);
1252: goto out;
1253: }
1254: debug3("%s: signing using %s", __func__, alg);
1255:
1256: sshbuf_free(b);
1257: if ((b = sshbuf_new()) == NULL)
1258: fatal("%s: sshbuf_new failed", __func__);
1259: if (datafellows & SSH_OLD_SESSIONID) {
1260: if ((r = sshbuf_put(b, session_id2,
1261: session_id2_len)) != 0) {
1262: fatal("%s: sshbuf_put: %s",
1263: __func__, ssh_err(r));
1264: }
1265: } else {
1266: if ((r = sshbuf_put_string(b, session_id2,
1267: session_id2_len)) != 0) {
1268: fatal("%s: sshbuf_put_string: %s",
1269: __func__, ssh_err(r));
1270: }
1271: }
1.278 markus 1272: skip = sshbuf_len(b);
1.272 djm 1273: if ((r = sshbuf_put_u8(b, SSH2_MSG_USERAUTH_REQUEST)) != 0 ||
1274: (r = sshbuf_put_cstring(b, authctxt->server_user)) != 0 ||
1275: (r = sshbuf_put_cstring(b, authctxt->service)) != 0 ||
1276: (r = sshbuf_put_cstring(b, authctxt->method->name)) != 0 ||
1277: (r = sshbuf_put_u8(b, 1)) != 0 ||
1278: (r = sshbuf_put_cstring(b, alg)) != 0 ||
1279: (r = sshkey_puts(id->key, b)) != 0) {
1280: fatal("%s: assemble signed data: %s",
1281: __func__, ssh_err(r));
1282: }
1283:
1284: /* generate signature */
1285: r = identity_sign(sign_id, &signature, &slen,
1286: sshbuf_ptr(b), sshbuf_len(b), datafellows, alg);
1287: if (r == 0)
1288: break;
1289: else if (r == SSH_ERR_KEY_NOT_FOUND)
1290: goto out; /* soft failure */
1291: else if (r == SSH_ERR_SIGN_ALG_UNSUPPORTED &&
1292: !fallback_sigtype) {
1293: if (sign_id->agent_fd != -1)
1294: loc = "agent ";
1295: else if ((sign_id->key->flags & SSHKEY_FLAG_EXT) != 0)
1296: loc = "token ";
1297: logit("%skey %s %s returned incorrect signature type",
1298: loc, sshkey_type(id->key), fp);
1299: continue;
1300: }
1301: error("%s: signing failed: %s", __func__, ssh_err(r));
1302: goto out;
1.17 markus 1303: }
1.272 djm 1304: if (slen == 0 || signature == NULL) /* shouldn't happen */
1305: fatal("%s: no signature", __func__);
1.51 markus 1306:
1.1 markus 1307: /* append signature */
1.272 djm 1308: if ((r = sshbuf_put_string(b, signature, slen)) != 0)
1309: fatal("%s: append signature: %s", __func__, ssh_err(r));
1.1 markus 1310:
1.272 djm 1311: #ifdef DEBUG_PK
1312: sshbuf_dump(b, stderr);
1313: #endif
1.1 markus 1314: /* skip session id and packet type */
1.272 djm 1315: if ((r = sshbuf_consume(b, skip + 1)) != 0)
1316: fatal("%s: consume: %s", __func__, ssh_err(r));
1.1 markus 1317:
1318: /* put remaining data from buffer into packet */
1.272 djm 1319: if ((r = sshpkt_start(ssh, SSH2_MSG_USERAUTH_REQUEST)) != 0 ||
1320: (r = sshpkt_putb(ssh, b)) != 0 ||
1321: (r = sshpkt_send(ssh)) != 0)
1322: fatal("%s: enqueue request: %s", __func__, ssh_err(r));
1323:
1324: /* success */
1325: sent = 1;
1.17 markus 1326:
1.272 djm 1327: out:
1328: free(fp);
1329: free(alg);
1330: sshbuf_free(b);
1331: freezero(signature, slen);
1332: return sent;
1.16 markus 1333: }
1334:
1.76 itojun 1335: static int
1.295 djm 1336: send_pubkey_test(struct ssh *ssh, Identity *id)
1.20 markus 1337: {
1.295 djm 1338: Authctxt *authctxt = (Authctxt *)ssh->authctxt;
1.272 djm 1339: u_char *blob = NULL;
1340: char *alg = NULL;
1.278 markus 1341: size_t bloblen;
1342: u_int have_sig = 0;
1343: int sent = 0, r;
1.20 markus 1344:
1.272 djm 1345: if ((alg = key_sig_algorithm(ssh, id->key)) == NULL) {
1346: debug("%s: no mutual signature algorithm", __func__);
1347: goto out;
1348: }
1.16 markus 1349:
1.278 markus 1350: if ((r = sshkey_to_blob(id->key, &blob, &bloblen)) != 0) {
1.51 markus 1351: /* we cannot handle this key */
1.272 djm 1352: debug3("%s: cannot handle key", __func__);
1353: goto out;
1.16 markus 1354: }
1.51 markus 1355: /* register callback for USERAUTH_PK_OK message */
1.278 markus 1356: ssh_dispatch_set(ssh, SSH2_MSG_USERAUTH_PK_OK, &input_userauth_pk_ok);
1.51 markus 1357:
1.278 markus 1358: if ((r = sshpkt_start(ssh, SSH2_MSG_USERAUTH_REQUEST)) != 0 ||
1359: (r = sshpkt_put_cstring(ssh, authctxt->server_user)) != 0 ||
1360: (r = sshpkt_put_cstring(ssh, authctxt->service)) != 0 ||
1361: (r = sshpkt_put_cstring(ssh, authctxt->method->name)) != 0 ||
1362: (r = sshpkt_put_u8(ssh, have_sig)) != 0 ||
1363: (r = sshpkt_put_cstring(ssh, alg)) != 0 ||
1364: (r = sshpkt_put_string(ssh, blob, bloblen)) != 0 ||
1365: (r = sshpkt_send(ssh)) != 0)
1366: fatal("%s: %s", __func__, ssh_err(r));
1.272 djm 1367: sent = 1;
1.278 markus 1368:
1369: out:
1.272 djm 1370: free(alg);
1.197 djm 1371: free(blob);
1.272 djm 1372: return sent;
1.51 markus 1373: }
1374:
1.259 markus 1375: static struct sshkey *
1.229 jcs 1376: load_identity_file(Identity *id)
1.51 markus 1377: {
1.259 markus 1378: struct sshkey *private = NULL;
1.229 jcs 1379: char prompt[300], *passphrase, *comment;
1.215 djm 1380: int r, perm_ok = 0, quit = 0, i;
1.52 markus 1381: struct stat st;
1.16 markus 1382:
1.229 jcs 1383: if (stat(id->filename, &st) < 0) {
1384: (id->userprovided ? logit : debug3)("no such identity: %s: %s",
1385: id->filename, strerror(errno));
1.52 markus 1386: return NULL;
1387: }
1.214 djm 1388: snprintf(prompt, sizeof prompt,
1.229 jcs 1389: "Enter passphrase for key '%.100s': ", id->filename);
1.214 djm 1390: for (i = 0; i <= options.number_of_password_prompts; i++) {
1391: if (i == 0)
1392: passphrase = "";
1393: else {
1.20 markus 1394: passphrase = read_passphrase(prompt, 0);
1.214 djm 1395: if (*passphrase == '\0') {
1.20 markus 1396: debug2("no passphrase given, try next key");
1.214 djm 1397: free(passphrase);
1398: break;
1399: }
1400: }
1.229 jcs 1401: switch ((r = sshkey_load_private_type(KEY_UNSPEC, id->filename,
1402: passphrase, &private, &comment, &perm_ok))) {
1.214 djm 1403: case 0:
1404: break;
1405: case SSH_ERR_KEY_WRONG_PASSPHRASE:
1406: if (options.batch_mode) {
1407: quit = 1;
1408: break;
1409: }
1.215 djm 1410: if (i != 0)
1411: debug2("bad passphrase given, try again...");
1.214 djm 1412: break;
1413: case SSH_ERR_SYSTEM_ERROR:
1414: if (errno == ENOENT) {
1415: debug2("Load key \"%s\": %s",
1.229 jcs 1416: id->filename, ssh_err(r));
1.51 markus 1417: quit = 1;
1.214 djm 1418: break;
1.20 markus 1419: }
1.214 djm 1420: /* FALLTHROUGH */
1421: default:
1.229 jcs 1422: error("Load key \"%s\": %s", id->filename, ssh_err(r));
1.214 djm 1423: quit = 1;
1424: break;
1425: }
1.230 djm 1426: if (!quit && private != NULL && id->agent_fd == -1 &&
1.229 jcs 1427: !(id->key && id->isprivate))
1428: maybe_add_key_to_agent(id->filename, private, comment,
1429: passphrase);
1.278 markus 1430: if (i > 0)
1431: freezero(passphrase, strlen(passphrase));
1.232 mmcc 1432: free(comment);
1.214 djm 1433: if (private != NULL || quit)
1434: break;
1.16 markus 1435: }
1.51 markus 1436: return private;
1437: }
1438:
1.272 djm 1439: static int
1440: key_type_allowed_by_config(struct sshkey *key)
1441: {
1442: if (match_pattern_list(sshkey_ssh_name(key),
1443: options.pubkey_key_types, 0) == 1)
1444: return 1;
1445:
1446: /* RSA keys/certs might be allowed by alternate signature types */
1447: switch (key->type) {
1448: case KEY_RSA:
1449: if (match_pattern_list("rsa-sha2-512",
1450: options.pubkey_key_types, 0) == 1)
1451: return 1;
1452: if (match_pattern_list("rsa-sha2-256",
1453: options.pubkey_key_types, 0) == 1)
1454: return 1;
1455: break;
1456: case KEY_RSA_CERT:
1457: if (match_pattern_list("rsa-sha2-512-cert-v01@openssh.com",
1458: options.pubkey_key_types, 0) == 1)
1459: return 1;
1460: if (match_pattern_list("rsa-sha2-256-cert-v01@openssh.com",
1461: options.pubkey_key_types, 0) == 1)
1462: return 1;
1463: break;
1464: }
1465: return 0;
1466: }
1467:
1468:
1.117 markus 1469: /*
1470: * try keys in the following order:
1.227 djm 1471: * 1. certificates listed in the config file
1472: * 2. other input certificates
1473: * 3. agent keys that are found in the config file
1474: * 4. other agent keys
1475: * 5. keys that are only listed in the config file
1.117 markus 1476: */
1477: static void
1478: pubkey_prepare(Authctxt *authctxt)
1.51 markus 1479: {
1.214 djm 1480: struct identity *id, *id2, *tmp;
1481: struct idlist agent, files, *preferred;
1482: struct sshkey *key;
1.230 djm 1483: int agent_fd = -1, i, r, found;
1.214 djm 1484: size_t j;
1485: struct ssh_identitylist *idlist;
1.287 djm 1486: char *ident;
1.51 markus 1487:
1.117 markus 1488: TAILQ_INIT(&agent); /* keys from the agent */
1489: TAILQ_INIT(&files); /* keys from the config file */
1490: preferred = &authctxt->keys;
1491: TAILQ_INIT(preferred); /* preferred order of keys */
1492:
1.190 djm 1493: /* list of keys stored in the filesystem and PKCS#11 */
1.117 markus 1494: for (i = 0; i < options.num_identity_files; i++) {
1495: key = options.identity_keys[i];
1.180 djm 1496: if (key && key->cert && key->cert->type != SSH2_CERT_TYPE_USER)
1.117 markus 1497: continue;
1498: options.identity_keys[i] = NULL;
1.150 djm 1499: id = xcalloc(1, sizeof(*id));
1.230 djm 1500: id->agent_fd = -1;
1.117 markus 1501: id->key = key;
1502: id->filename = xstrdup(options.identity_files[i]);
1.192 dtucker 1503: id->userprovided = options.identity_file_userprovided[i];
1.117 markus 1504: TAILQ_INSERT_TAIL(&files, id, next);
1.190 djm 1505: }
1.227 djm 1506: /* list of certificates specified by user */
1507: for (i = 0; i < options.num_certificate_files; i++) {
1508: key = options.certificates[i];
1.278 markus 1509: if (!sshkey_is_cert(key) || key->cert == NULL ||
1.227 djm 1510: key->cert->type != SSH2_CERT_TYPE_USER)
1511: continue;
1512: id = xcalloc(1, sizeof(*id));
1.230 djm 1513: id->agent_fd = -1;
1.227 djm 1514: id->key = key;
1515: id->filename = xstrdup(options.certificate_files[i]);
1516: id->userprovided = options.certificate_file_userprovided[i];
1517: TAILQ_INSERT_TAIL(preferred, id, next);
1.117 markus 1518: }
1519: /* list of keys supported by the agent */
1.214 djm 1520: if ((r = ssh_get_authentication_socket(&agent_fd)) != 0) {
1521: if (r != SSH_ERR_AGENT_NOT_PRESENT)
1522: debug("%s: ssh_get_authentication_socket: %s",
1523: __func__, ssh_err(r));
1.258 naddy 1524: } else if ((r = ssh_fetch_identitylist(agent_fd, &idlist)) != 0) {
1.214 djm 1525: if (r != SSH_ERR_AGENT_NO_IDENTITIES)
1526: debug("%s: ssh_fetch_identitylist: %s",
1527: __func__, ssh_err(r));
1.237 markus 1528: close(agent_fd);
1.214 djm 1529: } else {
1530: for (j = 0; j < idlist->nkeys; j++) {
1.117 markus 1531: found = 0;
1532: TAILQ_FOREACH(id, &files, next) {
1.214 djm 1533: /*
1534: * agent keys from the config file are
1535: * preferred
1536: */
1537: if (sshkey_equal(idlist->keys[j], id->key)) {
1.117 markus 1538: TAILQ_REMOVE(&files, id, next);
1539: TAILQ_INSERT_TAIL(preferred, id, next);
1.214 djm 1540: id->agent_fd = agent_fd;
1.117 markus 1541: found = 1;
1542: break;
1543: }
1544: }
1.135 markus 1545: if (!found && !options.identities_only) {
1.150 djm 1546: id = xcalloc(1, sizeof(*id));
1.214 djm 1547: /* XXX "steals" key/comment from idlist */
1548: id->key = idlist->keys[j];
1549: id->filename = idlist->comments[j];
1550: idlist->keys[j] = NULL;
1551: idlist->comments[j] = NULL;
1552: id->agent_fd = agent_fd;
1.117 markus 1553: TAILQ_INSERT_TAIL(&agent, id, next);
1554: }
1555: }
1.214 djm 1556: ssh_free_identitylist(idlist);
1.117 markus 1557: /* append remaining agent keys */
1558: for (id = TAILQ_FIRST(&agent); id; id = TAILQ_FIRST(&agent)) {
1559: TAILQ_REMOVE(&agent, id, next);
1560: TAILQ_INSERT_TAIL(preferred, id, next);
1561: }
1.214 djm 1562: authctxt->agent_fd = agent_fd;
1.244 djm 1563: }
1564: /* Prefer PKCS11 keys that are explicitly listed */
1565: TAILQ_FOREACH_SAFE(id, &files, next, tmp) {
1566: if (id->key == NULL || (id->key->flags & SSHKEY_FLAG_EXT) == 0)
1567: continue;
1568: found = 0;
1569: TAILQ_FOREACH(id2, &files, next) {
1570: if (id2->key == NULL ||
1571: (id2->key->flags & SSHKEY_FLAG_EXT) == 0)
1572: continue;
1573: if (sshkey_equal(id->key, id2->key)) {
1574: TAILQ_REMOVE(&files, id, next);
1575: TAILQ_INSERT_TAIL(preferred, id, next);
1576: found = 1;
1577: break;
1578: }
1579: }
1580: /* If IdentitiesOnly set and key not found then don't use it */
1581: if (!found && options.identities_only) {
1582: TAILQ_REMOVE(&files, id, next);
1.278 markus 1583: freezero(id, sizeof(*id));
1.244 djm 1584: }
1.117 markus 1585: }
1586: /* append remaining keys from the config file */
1587: for (id = TAILQ_FIRST(&files); id; id = TAILQ_FIRST(&files)) {
1588: TAILQ_REMOVE(&files, id, next);
1589: TAILQ_INSERT_TAIL(preferred, id, next);
1590: }
1.228 djm 1591: /* finally, filter by PubkeyAcceptedKeyTypes */
1592: TAILQ_FOREACH_SAFE(id, preferred, next, id2) {
1.273 djm 1593: if (id->key != NULL && !key_type_allowed_by_config(id->key)) {
1.228 djm 1594: debug("Skipping %s key %s - "
1595: "not in PubkeyAcceptedKeyTypes",
1596: sshkey_ssh_name(id->key), id->filename);
1597: TAILQ_REMOVE(preferred, id, next);
1598: sshkey_free(id->key);
1599: free(id->filename);
1600: memset(id, 0, sizeof(*id));
1601: continue;
1602: }
1.117 markus 1603: }
1.287 djm 1604: /* List the keys we plan on using */
1605: TAILQ_FOREACH_SAFE(id, preferred, next, id2) {
1606: ident = format_identity(id);
1607: debug("Will attempt key: %s", ident);
1608: free(ident);
1609: }
1610: debug2("%s: done", __func__);
1.17 markus 1611: }
1612:
1.117 markus 1613: static void
1614: pubkey_cleanup(Authctxt *authctxt)
1.51 markus 1615: {
1.117 markus 1616: Identity *id;
1.51 markus 1617:
1.289 djm 1618: if (authctxt->agent_fd != -1) {
1.214 djm 1619: ssh_close_authentication_socket(authctxt->agent_fd);
1.289 djm 1620: authctxt->agent_fd = -1;
1621: }
1.117 markus 1622: for (id = TAILQ_FIRST(&authctxt->keys); id;
1623: id = TAILQ_FIRST(&authctxt->keys)) {
1624: TAILQ_REMOVE(&authctxt->keys, id, next);
1.235 mmcc 1625: sshkey_free(id->key);
1.197 djm 1626: free(id->filename);
1627: free(id);
1.117 markus 1628: }
1.1 markus 1629: }
1630:
1.251 djm 1631: static void
1632: pubkey_reset(Authctxt *authctxt)
1633: {
1634: Identity *id;
1635:
1636: TAILQ_FOREACH(id, &authctxt->keys, next)
1637: id->tried = 0;
1638: }
1639:
1.225 markus 1640: static int
1641: try_identity(Identity *id)
1642: {
1643: if (!id->key)
1644: return (0);
1.279 markus 1645: if (sshkey_type_plain(id->key->type) == KEY_RSA &&
1.225 markus 1646: (datafellows & SSH_BUG_RSASIGMD5) != 0) {
1647: debug("Skipped %s key %s for RSA/MD5 server",
1.279 markus 1648: sshkey_type(id->key), id->filename);
1.225 markus 1649: return (0);
1650: }
1.257 djm 1651: return 1;
1.225 markus 1652: }
1653:
1.20 markus 1654: int
1.295 djm 1655: userauth_pubkey(struct ssh *ssh)
1.20 markus 1656: {
1.295 djm 1657: Authctxt *authctxt = (Authctxt *)ssh->authctxt;
1.117 markus 1658: Identity *id;
1.20 markus 1659: int sent = 0;
1.287 djm 1660: char *ident;
1.20 markus 1661:
1.117 markus 1662: while ((id = TAILQ_FIRST(&authctxt->keys))) {
1663: if (id->tried++)
1664: return (0);
1.127 markus 1665: /* move key to the end of the queue */
1.117 markus 1666: TAILQ_REMOVE(&authctxt->keys, id, next);
1667: TAILQ_INSERT_TAIL(&authctxt->keys, id, next);
1668: /*
1669: * send a test message if we have the public key. for
1670: * encrypted keys we cannot do this and have to load the
1671: * private key instead
1672: */
1.200 djm 1673: if (id->key != NULL) {
1.225 markus 1674: if (try_identity(id)) {
1.287 djm 1675: ident = format_identity(id);
1676: debug("Offering public key: %s", ident);
1677: free(ident);
1.295 djm 1678: sent = send_pubkey_test(ssh, id);
1.200 djm 1679: }
1680: } else {
1.117 markus 1681: debug("Trying private key: %s", id->filename);
1.229 jcs 1682: id->key = load_identity_file(id);
1.117 markus 1683: if (id->key != NULL) {
1.225 markus 1684: if (try_identity(id)) {
1685: id->isprivate = 1;
1.295 djm 1686: sent = sign_and_send_pubkey(ssh, id);
1.200 djm 1687: }
1.278 markus 1688: sshkey_free(id->key);
1.117 markus 1689: id->key = NULL;
1.251 djm 1690: id->isprivate = 0;
1.51 markus 1691: }
1692: }
1.117 markus 1693: if (sent)
1694: return (sent);
1.28 markus 1695: }
1.117 markus 1696: return (0);
1.20 markus 1697: }
1698:
1.23 markus 1699: /*
1700: * Send userauth request message specifying keyboard-interactive method.
1701: */
1702: int
1.295 djm 1703: userauth_kbdint(struct ssh *ssh)
1.23 markus 1704: {
1.295 djm 1705: Authctxt *authctxt = (Authctxt *)ssh->authctxt;
1.278 markus 1706: int r;
1.23 markus 1707:
1.292 djm 1708: if (authctxt->attempt_kbdint++ >= options.number_of_password_prompts)
1.23 markus 1709: return 0;
1.82 markus 1710: /* disable if no SSH2_MSG_USERAUTH_INFO_REQUEST has been seen */
1.292 djm 1711: if (authctxt->attempt_kbdint > 1 && !authctxt->info_req_seen) {
1.82 markus 1712: debug3("userauth_kbdint: disable: no info_req_seen");
1.278 markus 1713: ssh_dispatch_set(ssh, SSH2_MSG_USERAUTH_INFO_REQUEST, NULL);
1.82 markus 1714: return 0;
1715: }
1.23 markus 1716:
1717: debug2("userauth_kbdint");
1.278 markus 1718: if ((r = sshpkt_start(ssh, SSH2_MSG_USERAUTH_REQUEST)) != 0 ||
1719: (r = sshpkt_put_cstring(ssh, authctxt->server_user)) != 0 ||
1720: (r = sshpkt_put_cstring(ssh, authctxt->service)) != 0 ||
1721: (r = sshpkt_put_cstring(ssh, authctxt->method->name)) != 0 ||
1722: (r = sshpkt_put_cstring(ssh, "")) != 0 || /* lang */
1723: (r = sshpkt_put_cstring(ssh, options.kbd_interactive_devices ?
1724: options.kbd_interactive_devices : "")) != 0 ||
1725: (r = sshpkt_send(ssh)) != 0)
1726: fatal("%s: %s", __func__, ssh_err(r));
1.23 markus 1727:
1.278 markus 1728: ssh_dispatch_set(ssh, SSH2_MSG_USERAUTH_INFO_REQUEST, &input_userauth_info_req);
1.23 markus 1729: return 1;
1730: }
1731:
1732: /*
1.46 markus 1733: * parse INFO_REQUEST, prompt user and send INFO_RESPONSE
1.23 markus 1734: */
1.218 markus 1735: int
1.261 markus 1736: input_userauth_info_req(int type, u_int32_t seq, struct ssh *ssh)
1.23 markus 1737: {
1.260 markus 1738: Authctxt *authctxt = ssh->authctxt;
1.278 markus 1739: char *name = NULL, *inst = NULL, *lang = NULL, *prompt = NULL;
1740: char *response = NULL;
1741: u_char echo = 0;
1.32 markus 1742: u_int num_prompts, i;
1.278 markus 1743: int r;
1.23 markus 1744:
1745: debug2("input_userauth_info_req");
1746:
1747: if (authctxt == NULL)
1748: fatal("input_userauth_info_req: no authentication context");
1.82 markus 1749:
1750: authctxt->info_req_seen = 1;
1.23 markus 1751:
1.278 markus 1752: if ((r = sshpkt_get_cstring(ssh, &name, NULL)) != 0 ||
1753: (r = sshpkt_get_cstring(ssh, &inst, NULL)) != 0 ||
1754: (r = sshpkt_get_cstring(ssh, &lang, NULL)) != 0)
1755: goto out;
1.23 markus 1756: if (strlen(name) > 0)
1.116 itojun 1757: logit("%s", name);
1.23 markus 1758: if (strlen(inst) > 0)
1.116 itojun 1759: logit("%s", inst);
1.23 markus 1760:
1.278 markus 1761: if ((r = sshpkt_get_u32(ssh, &num_prompts)) != 0)
1762: goto out;
1.23 markus 1763: /*
1764: * Begin to build info response packet based on prompts requested.
1765: * We commit to providing the correct number of responses, so if
1766: * further on we run into a problem that prevents this, we have to
1767: * be sure and clean this up and send a correct error response.
1768: */
1.278 markus 1769: if ((r = sshpkt_start(ssh, SSH2_MSG_USERAUTH_INFO_RESPONSE)) != 0 ||
1770: (r = sshpkt_put_u32(ssh, num_prompts)) != 0)
1771: goto out;
1.23 markus 1772:
1.73 markus 1773: debug2("input_userauth_info_req: num_prompts %d", num_prompts);
1.23 markus 1774: for (i = 0; i < num_prompts; i++) {
1.278 markus 1775: if ((r = sshpkt_get_cstring(ssh, &prompt, NULL)) != 0 ||
1776: (r = sshpkt_get_u8(ssh, &echo)) != 0)
1777: goto out;
1.77 markus 1778: response = read_passphrase(prompt, echo ? RP_ECHO : 0);
1.278 markus 1779: if ((r = sshpkt_put_cstring(ssh, response)) != 0)
1780: goto out;
1781: freezero(response, strlen(response));
1.197 djm 1782: free(prompt);
1.278 markus 1783: response = prompt = NULL;
1.23 markus 1784: }
1.278 markus 1785: /* done with parsing incoming message. */
1786: if ((r = sshpkt_get_end(ssh)) != 0 ||
1787: (r = sshpkt_add_padding(ssh, 64)) != 0)
1788: goto out;
1789: r = sshpkt_send(ssh);
1790: out:
1791: if (response)
1792: freezero(response, strlen(response));
1793: free(prompt);
1794: free(name);
1795: free(inst);
1796: free(lang);
1797: return r;
1.68 markus 1798: }
1799:
1.100 markus 1800: static int
1.294 djm 1801: ssh_keysign(struct ssh *ssh, struct sshkey *key, u_char **sigp, size_t *lenp,
1.223 djm 1802: const u_char *data, size_t datalen)
1.100 markus 1803: {
1.223 djm 1804: struct sshbuf *b;
1.101 markus 1805: struct stat st;
1.100 markus 1806: pid_t pid;
1.295 djm 1807: int i, r, to[2], from[2], status;
1808: int sock = ssh_packet_get_connection_in(ssh);
1.223 djm 1809: u_char rversion = 0, version = 2;
1810: void (*osigchld)(int);
1.100 markus 1811:
1.223 djm 1812: *sigp = NULL;
1813: *lenp = 0;
1.100 markus 1814:
1.101 markus 1815: if (stat(_PATH_SSH_KEY_SIGN, &st) < 0) {
1.223 djm 1816: error("%s: not installed: %s", __func__, strerror(errno));
1817: return -1;
1818: }
1819: if (fflush(stdout) != 0) {
1820: error("%s: fflush: %s", __func__, strerror(errno));
1.101 markus 1821: return -1;
1822: }
1.100 markus 1823: if (pipe(to) < 0) {
1.223 djm 1824: error("%s: pipe: %s", __func__, strerror(errno));
1.100 markus 1825: return -1;
1826: }
1827: if (pipe(from) < 0) {
1.223 djm 1828: error("%s: pipe: %s", __func__, strerror(errno));
1.100 markus 1829: return -1;
1830: }
1831: if ((pid = fork()) < 0) {
1.223 djm 1832: error("%s: fork: %s", __func__, strerror(errno));
1.100 markus 1833: return -1;
1834: }
1.223 djm 1835: osigchld = signal(SIGCHLD, SIG_DFL);
1.100 markus 1836: if (pid == 0) {
1.174 dtucker 1837: /* keep the socket on exec */
1.223 djm 1838: fcntl(sock, F_SETFD, 0);
1.100 markus 1839: close(from[0]);
1840: if (dup2(from[1], STDOUT_FILENO) < 0)
1.223 djm 1841: fatal("%s: dup2: %s", __func__, strerror(errno));
1.100 markus 1842: close(to[1]);
1843: if (dup2(to[0], STDIN_FILENO) < 0)
1.223 djm 1844: fatal("%s: dup2: %s", __func__, strerror(errno));
1.103 markus 1845: close(from[1]);
1846: close(to[0]);
1.223 djm 1847: /* Close everything but stdio and the socket */
1848: for (i = STDERR_FILENO + 1; i < sock; i++)
1849: close(i);
1850: closefrom(sock + 1);
1851: debug3("%s: [child] pid=%ld, exec %s",
1852: __func__, (long)getpid(), _PATH_SSH_KEY_SIGN);
1.233 mmcc 1853: execl(_PATH_SSH_KEY_SIGN, _PATH_SSH_KEY_SIGN, (char *)NULL);
1.223 djm 1854: fatal("%s: exec(%s): %s", __func__, _PATH_SSH_KEY_SIGN,
1.100 markus 1855: strerror(errno));
1856: }
1857: close(from[1]);
1858: close(to[0]);
1859:
1.223 djm 1860: if ((b = sshbuf_new()) == NULL)
1861: fatal("%s: sshbuf_new failed", __func__);
1862: /* send # of sock, data to be signed */
1.253 djm 1863: if ((r = sshbuf_put_u32(b, sock)) != 0 ||
1.223 djm 1864: (r = sshbuf_put_string(b, data, datalen)) != 0)
1865: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1866: if (ssh_msg_send(to[1], version, b) == -1)
1867: fatal("%s: couldn't send request", __func__);
1868: sshbuf_reset(b);
1869: r = ssh_msg_recv(from[0], b);
1.101 markus 1870: close(from[0]);
1871: close(to[1]);
1.223 djm 1872: if (r < 0) {
1873: error("%s: no reply", __func__);
1874: goto fail;
1875: }
1.101 markus 1876:
1.223 djm 1877: errno = 0;
1878: while (waitpid(pid, &status, 0) < 0) {
1879: if (errno != EINTR) {
1880: error("%s: waitpid %ld: %s",
1881: __func__, (long)pid, strerror(errno));
1882: goto fail;
1883: }
1884: }
1885: if (!WIFEXITED(status)) {
1886: error("%s: exited abnormally", __func__);
1887: goto fail;
1888: }
1889: if (WEXITSTATUS(status) != 0) {
1890: error("%s: exited with status %d",
1891: __func__, WEXITSTATUS(status));
1892: goto fail;
1893: }
1894: if ((r = sshbuf_get_u8(b, &rversion)) != 0) {
1895: error("%s: buffer error: %s", __func__, ssh_err(r));
1896: goto fail;
1897: }
1898: if (rversion != version) {
1899: error("%s: bad version", __func__);
1900: goto fail;
1901: }
1902: if ((r = sshbuf_get_string(b, sigp, lenp)) != 0) {
1903: error("%s: buffer error: %s", __func__, ssh_err(r));
1904: fail:
1905: signal(SIGCHLD, osigchld);
1906: sshbuf_free(b);
1.100 markus 1907: return -1;
1908: }
1.223 djm 1909: signal(SIGCHLD, osigchld);
1910: sshbuf_free(b);
1.100 markus 1911:
1912: return 0;
1913: }
1914:
1.68 markus 1915: int
1.295 djm 1916: userauth_hostbased(struct ssh *ssh)
1.68 markus 1917: {
1.295 djm 1918: Authctxt *authctxt = (Authctxt *)ssh->authctxt;
1.223 djm 1919: struct sshkey *private = NULL;
1920: struct sshbuf *b = NULL;
1921: u_char *sig = NULL, *keyblob = NULL;
1922: char *fp = NULL, *chost = NULL, *lname = NULL;
1923: size_t siglen = 0, keylen = 0;
1924: int i, r, success = 0;
1925:
1926: if (authctxt->ktypes == NULL) {
1927: authctxt->oktypes = xstrdup(options.hostbased_key_types);
1928: authctxt->ktypes = authctxt->oktypes;
1929: }
1.213 djm 1930:
1.223 djm 1931: /*
1932: * Work through each listed type pattern in HostbasedKeyTypes,
1933: * trying each hostkey that matches the type in turn.
1934: */
1935: for (;;) {
1936: if (authctxt->active_ktype == NULL)
1937: authctxt->active_ktype = strsep(&authctxt->ktypes, ",");
1938: if (authctxt->active_ktype == NULL ||
1939: *authctxt->active_ktype == '\0')
1940: break;
1941: debug3("%s: trying key type %s", __func__,
1942: authctxt->active_ktype);
1.68 markus 1943:
1.223 djm 1944: /* check for a useful key */
1945: private = NULL;
1946: for (i = 0; i < authctxt->sensitive->nkeys; i++) {
1947: if (authctxt->sensitive->keys[i] == NULL ||
1948: authctxt->sensitive->keys[i]->type == KEY_UNSPEC)
1949: continue;
1950: if (match_pattern_list(
1951: sshkey_ssh_name(authctxt->sensitive->keys[i]),
1.224 djm 1952: authctxt->active_ktype, 0) != 1)
1.223 djm 1953: continue;
1.68 markus 1954: /* we take and free the key */
1.223 djm 1955: private = authctxt->sensitive->keys[i];
1956: authctxt->sensitive->keys[i] = NULL;
1.68 markus 1957: break;
1958: }
1.223 djm 1959: /* Found one */
1960: if (private != NULL)
1961: break;
1962: /* No more keys of this type; advance */
1963: authctxt->active_ktype = NULL;
1.68 markus 1964: }
1.223 djm 1965: if (private == NULL) {
1966: free(authctxt->oktypes);
1967: authctxt->oktypes = authctxt->ktypes = NULL;
1968: authctxt->active_ktype = NULL;
1.109 markus 1969: debug("No more client hostkeys for hostbased authentication.");
1.223 djm 1970: goto out;
1.68 markus 1971: }
1.211 djm 1972:
1.223 djm 1973: if ((fp = sshkey_fingerprint(private, options.fingerprint_hash,
1974: SSH_FP_DEFAULT)) == NULL) {
1975: error("%s: sshkey_fingerprint failed", __func__);
1976: goto out;
1.68 markus 1977: }
1.223 djm 1978: debug("%s: trying hostkey %s %s",
1979: __func__, sshkey_ssh_name(private), fp);
1.211 djm 1980:
1.84 markus 1981: /* figure out a name for the client host */
1.295 djm 1982: lname = get_local_name(ssh_packet_get_connection_in(ssh));
1983: if (lname == NULL) {
1.223 djm 1984: error("%s: cannot get local ipaddr/name", __func__);
1985: goto out;
1.84 markus 1986: }
1.223 djm 1987:
1988: /* XXX sshbuf_put_stringf? */
1989: xasprintf(&chost, "%s.", lname);
1990: debug2("%s: chost %s", __func__, chost);
1.84 markus 1991:
1.68 markus 1992: /* construct data */
1.223 djm 1993: if ((b = sshbuf_new()) == NULL) {
1994: error("%s: sshbuf_new failed", __func__);
1995: goto out;
1996: }
1997: if ((r = sshkey_to_blob(private, &keyblob, &keylen)) != 0) {
1998: error("%s: sshkey_to_blob: %s", __func__, ssh_err(r));
1999: goto out;
2000: }
2001: if ((r = sshbuf_put_string(b, session_id2, session_id2_len)) != 0 ||
2002: (r = sshbuf_put_u8(b, SSH2_MSG_USERAUTH_REQUEST)) != 0 ||
2003: (r = sshbuf_put_cstring(b, authctxt->server_user)) != 0 ||
1.267 djm 2004: (r = sshbuf_put_cstring(b, authctxt->service)) != 0 ||
1.223 djm 2005: (r = sshbuf_put_cstring(b, authctxt->method->name)) != 0 ||
1.279 markus 2006: (r = sshbuf_put_cstring(b, sshkey_ssh_name(private))) != 0 ||
1.223 djm 2007: (r = sshbuf_put_string(b, keyblob, keylen)) != 0 ||
2008: (r = sshbuf_put_cstring(b, chost)) != 0 ||
2009: (r = sshbuf_put_cstring(b, authctxt->local_user)) != 0) {
2010: error("%s: buffer error: %s", __func__, ssh_err(r));
2011: goto out;
2012: }
2013:
1.68 markus 2014: #ifdef DEBUG_PK
1.223 djm 2015: sshbuf_dump(b, stderr);
1.68 markus 2016: #endif
1.294 djm 2017: if ((r = ssh_keysign(ssh, private, &sig, &siglen,
2018: sshbuf_ptr(b), sshbuf_len(b))) != 0) {
1.223 djm 2019: error("sign using hostkey %s %s failed",
2020: sshkey_ssh_name(private), fp);
2021: goto out;
2022: }
2023: if ((r = sshpkt_start(ssh, SSH2_MSG_USERAUTH_REQUEST)) != 0 ||
2024: (r = sshpkt_put_cstring(ssh, authctxt->server_user)) != 0 ||
2025: (r = sshpkt_put_cstring(ssh, authctxt->service)) != 0 ||
2026: (r = sshpkt_put_cstring(ssh, authctxt->method->name)) != 0 ||
1.279 markus 2027: (r = sshpkt_put_cstring(ssh, sshkey_ssh_name(private))) != 0 ||
1.223 djm 2028: (r = sshpkt_put_string(ssh, keyblob, keylen)) != 0 ||
2029: (r = sshpkt_put_cstring(ssh, chost)) != 0 ||
2030: (r = sshpkt_put_cstring(ssh, authctxt->local_user)) != 0 ||
2031: (r = sshpkt_put_string(ssh, sig, siglen)) != 0 ||
2032: (r = sshpkt_send(ssh)) != 0) {
2033: error("%s: packet error: %s", __func__, ssh_err(r));
2034: goto out;
2035: }
2036: success = 1;
2037:
2038: out:
1.278 markus 2039: if (sig != NULL)
2040: freezero(sig, siglen);
1.223 djm 2041: free(keyblob);
2042: free(lname);
2043: free(fp);
1.197 djm 2044: free(chost);
1.223 djm 2045: sshkey_free(private);
2046: sshbuf_free(b);
1.68 markus 2047:
1.223 djm 2048: return success;
1.23 markus 2049: }
1.170 djm 2050:
1.20 markus 2051: /* find auth method */
2052:
2053: /*
2054: * given auth method name, if configurable options permit this method fill
2055: * in auth_ident field and return true, otherwise return false.
2056: */
1.76 itojun 2057: static int
1.20 markus 2058: authmethod_is_enabled(Authmethod *method)
2059: {
2060: if (method == NULL)
2061: return 0;
2062: /* return false if options indicate this method is disabled */
2063: if (method->enabled == NULL || *method->enabled == 0)
2064: return 0;
2065: /* return false if batch mode is enabled but method needs interactive mode */
2066: if (method->batch_flag != NULL && *method->batch_flag != 0)
2067: return 0;
2068: return 1;
2069: }
2070:
1.76 itojun 2071: static Authmethod *
1.20 markus 2072: authmethod_lookup(const char *name)
1.1 markus 2073: {
1.20 markus 2074: Authmethod *method = NULL;
2075: if (name != NULL)
2076: for (method = authmethods; method->name != NULL; method++)
2077: if (strcmp(name, method->name) == 0)
2078: return method;
2079: debug2("Unrecognized authentication method name: %s", name ? name : "NULL");
2080: return NULL;
2081: }
1.1 markus 2082:
1.53 markus 2083: /* XXX internal state */
2084: static Authmethod *current = NULL;
2085: static char *supported = NULL;
2086: static char *preferred = NULL;
1.105 deraadt 2087:
1.20 markus 2088: /*
2089: * Given the authentication method list sent by the server, return the
2090: * next method we should try. If the server initially sends a nil list,
1.67 markus 2091: * use a built-in default list.
1.41 stevesk 2092: */
1.76 itojun 2093: static Authmethod *
1.20 markus 2094: authmethod_get(char *authlist)
2095: {
1.53 markus 2096: char *name = NULL;
1.97 markus 2097: u_int next;
1.41 stevesk 2098:
1.20 markus 2099: /* Use a suitable default if we're passed a nil list. */
2100: if (authlist == NULL || strlen(authlist) == 0)
1.53 markus 2101: authlist = options.preferred_authentications;
1.20 markus 2102:
1.53 markus 2103: if (supported == NULL || strcmp(authlist, supported) != 0) {
2104: debug3("start over, passed a different list %s", authlist);
1.197 djm 2105: free(supported);
1.53 markus 2106: supported = xstrdup(authlist);
2107: preferred = options.preferred_authentications;
2108: debug3("preferred %s", preferred);
2109: current = NULL;
2110: } else if (current != NULL && authmethod_is_enabled(current))
2111: return current;
1.20 markus 2112:
1.53 markus 2113: for (;;) {
2114: if ((name = match_list(preferred, supported, &next)) == NULL) {
1.109 markus 2115: debug("No more authentication methods to try.");
1.53 markus 2116: current = NULL;
2117: return NULL;
2118: }
2119: preferred += next;
1.23 markus 2120: debug3("authmethod_lookup %s", name);
1.53 markus 2121: debug3("remaining preferred: %s", preferred);
2122: if ((current = authmethod_lookup(name)) != NULL &&
2123: authmethod_is_enabled(current)) {
1.23 markus 2124: debug3("authmethod_is_enabled %s", name);
1.109 markus 2125: debug("Next authentication method: %s", name);
1.197 djm 2126: free(name);
1.53 markus 2127: return current;
1.23 markus 2128: }
1.198 dtucker 2129: free(name);
1.1 markus 2130: }
1.53 markus 2131: }
1.1 markus 2132:
1.79 stevesk 2133: static char *
1.53 markus 2134: authmethods_get(void)
2135: {
2136: Authmethod *method = NULL;
1.278 markus 2137: struct sshbuf *b;
1.93 markus 2138: char *list;
1.278 markus 2139: int r;
1.27 provos 2140:
1.278 markus 2141: if ((b = sshbuf_new()) == NULL)
2142: fatal("%s: sshbuf_new failed", __func__);
1.53 markus 2143: for (method = authmethods; method->name != NULL; method++) {
2144: if (authmethod_is_enabled(method)) {
1.278 markus 2145: if ((r = sshbuf_putf(b, "%s%s",
2146: sshbuf_len(b) ? "," : "", method->name)) != 0)
2147: fatal("%s: buffer error: %s",
2148: __func__, ssh_err(r));
1.53 markus 2149: }
2150: }
1.278 markus 2151: if ((list = sshbuf_dup_string(b)) == NULL)
1.242 djm 2152: fatal("%s: sshbuf_dup_string failed", __func__);
1.278 markus 2153: sshbuf_free(b);
1.93 markus 2154: return list;
1.1 markus 2155: }
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