Annotation of src/usr.bin/ssh/sshconnect2.c, Revision 1.288
1.288 ! djm 1: /* $OpenBSD: sshconnect2.c,v 1.287 2018/09/14 05:26:27 djm Exp $ */
1.1 markus 2: /*
3: * Copyright (c) 2000 Markus Friedl. All rights reserved.
1.170 djm 4: * Copyright (c) 2008 Damien Miller. All rights reserved.
1.1 markus 5: *
6: * Redistribution and use in source and binary forms, with or without
7: * modification, are permitted provided that the following conditions
8: * are met:
9: * 1. Redistributions of source code must retain the above copyright
10: * notice, this list of conditions and the following disclaimer.
11: * 2. Redistributions in binary form must reproduce the above copyright
12: * notice, this list of conditions and the following disclaimer in the
13: * documentation and/or other materials provided with the distribution.
14: *
15: * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
16: * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
17: * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
18: * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
19: * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
20: * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
21: * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
22: * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
23: * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
24: * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
25: */
26:
1.145 stevesk 27: #include <sys/types.h>
1.160 deraadt 28: #include <sys/socket.h>
1.145 stevesk 29: #include <sys/wait.h>
1.144 stevesk 30: #include <sys/queue.h>
1.146 stevesk 31: #include <sys/stat.h>
1.156 stevesk 32:
33: #include <errno.h>
1.174 dtucker 34: #include <fcntl.h>
1.164 jolan 35: #include <netdb.h>
1.159 stevesk 36: #include <stdio.h>
1.158 stevesk 37: #include <string.h>
1.160 deraadt 38: #include <signal.h>
39: #include <pwd.h>
1.157 stevesk 40: #include <unistd.h>
1.166 djm 41: #include <vis.h>
1.1 markus 42:
1.160 deraadt 43: #include "xmalloc.h"
1.1 markus 44: #include "ssh.h"
1.37 markus 45: #include "ssh2.h"
1.278 markus 46: #include "sshbuf.h"
1.1 markus 47: #include "packet.h"
48: #include "compat.h"
1.37 markus 49: #include "cipher.h"
1.278 markus 50: #include "sshkey.h"
1.1 markus 51: #include "kex.h"
52: #include "myproposal.h"
53: #include "sshconnect.h"
54: #include "authfile.h"
1.57 provos 55: #include "dh.h"
1.17 markus 56: #include "authfd.h"
1.37 markus 57: #include "log.h"
1.210 millert 58: #include "misc.h"
1.37 markus 59: #include "readconf.h"
1.53 markus 60: #include "match.h"
1.61 markus 61: #include "dispatch.h"
1.68 markus 62: #include "canohost.h"
1.100 markus 63: #include "msg.h"
64: #include "pathnames.h"
1.154 markus 65: #include "uidswap.h"
1.186 djm 66: #include "hostfile.h"
1.214 djm 67: #include "ssherr.h"
1.246 djm 68: #include "utf8.h"
1.22 provos 69:
1.121 markus 70: #ifdef GSSAPI
71: #include "ssh-gss.h"
72: #endif
73:
1.1 markus 74: /* import */
75: extern char *client_version_string;
76: extern char *server_version_string;
77: extern Options options;
78:
79: /*
80: * SSH2 key exchange
81: */
82:
1.32 markus 83: u_char *session_id2 = NULL;
1.120 markus 84: u_int session_id2_len = 0;
1.1 markus 85:
1.61 markus 86: char *xxx_host;
87: struct sockaddr *xxx_hostaddr;
88:
1.76 itojun 89: static int
1.259 markus 90: verify_host_key_callback(struct sshkey *hostkey, struct ssh *ssh)
1.61 markus 91: {
1.75 markus 92: if (verify_host_key(xxx_host, xxx_hostaddr, hostkey) == -1)
1.83 markus 93: fatal("Host key verification failed.");
1.61 markus 94: return 0;
95: }
96:
1.186 djm 97: static char *
98: order_hostkeyalgs(char *host, struct sockaddr *hostaddr, u_short port)
99: {
100: char *oavail, *avail, *first, *last, *alg, *hostname, *ret;
101: size_t maxlen;
102: struct hostkeys *hostkeys;
103: int ktype;
1.188 djm 104: u_int i;
1.186 djm 105:
106: /* Find all hostkeys for this hostname */
107: get_hostfile_hostname_ipaddr(host, hostaddr, port, &hostname, NULL);
108: hostkeys = init_hostkeys();
1.188 djm 109: for (i = 0; i < options.num_user_hostfiles; i++)
110: load_hostkeys(hostkeys, hostname, options.user_hostfiles[i]);
111: for (i = 0; i < options.num_system_hostfiles; i++)
112: load_hostkeys(hostkeys, hostname, options.system_hostfiles[i]);
1.186 djm 113:
114: oavail = avail = xstrdup(KEX_DEFAULT_PK_ALG);
115: maxlen = strlen(avail) + 1;
116: first = xmalloc(maxlen);
117: last = xmalloc(maxlen);
118: *first = *last = '\0';
119:
120: #define ALG_APPEND(to, from) \
121: do { \
122: if (*to != '\0') \
123: strlcat(to, ",", maxlen); \
124: strlcat(to, from, maxlen); \
125: } while (0)
126:
127: while ((alg = strsep(&avail, ",")) && *alg != '\0') {
1.214 djm 128: if ((ktype = sshkey_type_from_name(alg)) == KEY_UNSPEC)
1.186 djm 129: fatal("%s: unknown alg %s", __func__, alg);
130: if (lookup_key_in_hostkeys_by_type(hostkeys,
1.214 djm 131: sshkey_type_plain(ktype), NULL))
1.186 djm 132: ALG_APPEND(first, alg);
133: else
134: ALG_APPEND(last, alg);
135: }
136: #undef ALG_APPEND
1.216 djm 137: xasprintf(&ret, "%s%s%s", first,
138: (*first == '\0' || *last == '\0') ? "" : ",", last);
1.186 djm 139: if (*first != '\0')
140: debug3("%s: prefer hostkeyalgs: %s", __func__, first);
141:
1.197 djm 142: free(first);
143: free(last);
144: free(hostname);
145: free(oavail);
1.186 djm 146: free_hostkeys(hostkeys);
147:
148: return ret;
149: }
150:
1.1 markus 151: void
1.186 djm 152: ssh_kex2(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;
1.219 markus 156: struct kex *kex;
1.221 markus 157: int r;
1.61 markus 158:
159: xxx_host = host;
160: xxx_hostaddr = hostaddr;
1.22 provos 161:
1.231 markus 162: if ((s = kex_names_cat(options.kex_algorithms, "ext-info-c")) == NULL)
163: fatal("%s: kex_names_cat", __func__);
1.284 djm 164: myproposal[PROPOSAL_KEX_ALGS] = compat_kex_proposal(s);
1.60 stevesk 165: myproposal[PROPOSAL_ENC_ALGS_CTOS] =
1.284 djm 166: compat_cipher_proposal(options.ciphers);
1.60 stevesk 167: myproposal[PROPOSAL_ENC_ALGS_STOC] =
1.284 djm 168: compat_cipher_proposal(options.ciphers);
1.245 dtucker 169: myproposal[PROPOSAL_COMP_ALGS_CTOS] =
170: myproposal[PROPOSAL_COMP_ALGS_STOC] = options.compression ?
1.277 sf 171: "zlib@openssh.com,zlib,none" : "none,zlib@openssh.com,zlib";
1.226 djm 172: myproposal[PROPOSAL_MAC_ALGS_CTOS] =
173: myproposal[PROPOSAL_MAC_ALGS_STOC] = options.macs;
174: if (options.hostkeyalgorithms != NULL) {
1.275 djm 175: all_key = sshkey_alg_list(0, 0, 1, ',');
176: if (kex_assemble_names(&options.hostkeyalgorithms,
177: KEX_DEFAULT_PK_ALG, all_key) != 0)
1.226 djm 178: fatal("%s: kex_assemble_namelist", __func__);
1.275 djm 179: free(all_key);
1.88 deraadt 180: myproposal[PROPOSAL_SERVER_HOST_KEY_ALGS] =
1.284 djm 181: compat_pkalg_proposal(options.hostkeyalgorithms);
1.226 djm 182: } else {
1.225 markus 183: /* Enforce default */
184: options.hostkeyalgorithms = xstrdup(KEX_DEFAULT_PK_ALG);
1.186 djm 185: /* Prefer algorithms that we already have keys for */
186: myproposal[PROPOSAL_SERVER_HOST_KEY_ALGS] =
1.200 djm 187: compat_pkalg_proposal(
1.284 djm 188: order_hostkeyalgs(host, hostaddr, port));
1.186 djm 189: }
1.115 markus 190:
1.196 dtucker 191: if (options.rekey_limit || options.rekey_interval)
1.254 dtucker 192: packet_set_rekey_limits(options.rekey_limit,
193: options.rekey_interval);
1.22 provos 194:
1.65 markus 195: /* start key exchange */
1.221 markus 196: if ((r = kex_setup(active_state, myproposal)) != 0)
197: fatal("kex_setup: %s", ssh_err(r));
1.219 markus 198: kex = active_state->kex;
1.207 markus 199: #ifdef WITH_OPENSSL
1.111 markus 200: kex->kex[KEX_DH_GRP1_SHA1] = kexdh_client;
1.138 djm 201: kex->kex[KEX_DH_GRP14_SHA1] = kexdh_client;
1.243 djm 202: kex->kex[KEX_DH_GRP14_SHA256] = kexdh_client;
203: kex->kex[KEX_DH_GRP16_SHA512] = kexdh_client;
204: kex->kex[KEX_DH_GRP18_SHA512] = kexdh_client;
1.111 markus 205: kex->kex[KEX_DH_GEX_SHA1] = kexgex_client;
1.147 djm 206: kex->kex[KEX_DH_GEX_SHA256] = kexgex_client;
1.184 djm 207: kex->kex[KEX_ECDH_SHA2] = kexecdh_client;
1.207 markus 208: #endif
1.199 markus 209: kex->kex[KEX_C25519_SHA256] = kexc25519_client;
1.61 markus 210: kex->client_version_string=client_version_string;
211: kex->server_version_string=server_version_string;
1.75 markus 212: kex->verify_host_key=&verify_host_key_callback;
1.22 provos 213:
1.263 markus 214: ssh_dispatch_run_fatal(active_state, DISPATCH_BLOCK, &kex->done);
1.173 andreas 215:
1.231 markus 216: /* remove ext-info from the KEX proposals for rekeying */
217: myproposal[PROPOSAL_KEX_ALGS] =
1.284 djm 218: compat_kex_proposal(options.kex_algorithms);
1.231 markus 219: if ((r = kex_prop2buf(kex->my, myproposal)) != 0)
220: fatal("kex_prop2buf: %s", ssh_err(r));
1.62 markus 221:
222: session_id2 = kex->session_id;
223: session_id2_len = kex->session_id_len;
1.22 provos 224:
225: #ifdef DEBUG_KEXDH
226: /* send 1st encrypted/maced/compressed message */
1.278 markus 227: if ((r = sshpkt_start(ssh, SSH2_MSG_IGNORE)) != 0 ||
228: (r = sshpkt_put_cstring(ssh, "markus")) != 0 ||
1.280 markus 229: (r = sshpkt_send(ssh)) != 0 ||
230: (r = ssh_packet_write_wait(ssh)) != 0)
1.278 markus 231: fatal("%s: %s", __func__, ssh_err(r));
1.22 provos 232: #endif
1.1 markus 233: }
1.11 markus 234:
1.1 markus 235: /*
236: * Authenticate user
237: */
1.20 markus 238:
1.214 djm 239: typedef struct cauthctxt Authctxt;
240: typedef struct cauthmethod Authmethod;
1.117 markus 241: typedef struct identity Identity;
242: typedef struct idlist Idlist;
1.20 markus 243:
1.117 markus 244: struct identity {
245: TAILQ_ENTRY(identity) next;
1.214 djm 246: int agent_fd; /* >=0 if agent supports key */
247: struct sshkey *key; /* public/private key */
1.117 markus 248: char *filename; /* comment for agent-only keys */
249: int tried;
250: int isprivate; /* key points to the private key */
1.191 dtucker 251: int userprovided;
1.117 markus 252: };
253: TAILQ_HEAD(idlist, identity);
1.20 markus 254:
1.214 djm 255: struct cauthctxt {
1.20 markus 256: const char *server_user;
1.68 markus 257: const char *local_user;
1.20 markus 258: const char *host;
259: const char *service;
1.214 djm 260: struct cauthmethod *method;
1.183 djm 261: sig_atomic_t success;
1.51 markus 262: char *authlist;
1.214 djm 263: int attempt;
1.68 markus 264: /* pubkey */
1.214 djm 265: struct idlist keys;
266: int agent_fd;
1.68 markus 267: /* hostbased */
1.100 markus 268: Sensitive *sensitive;
1.223 djm 269: char *oktypes, *ktypes;
270: const char *active_ktype;
1.82 markus 271: /* kbd-interactive */
272: int info_req_seen;
1.121 markus 273: /* generic */
274: void *methoddata;
1.20 markus 275: };
1.214 djm 276:
277: struct cauthmethod {
1.20 markus 278: char *name; /* string to compare against server's list */
279: int (*userauth)(Authctxt *authctxt);
1.170 djm 280: void (*cleanup)(Authctxt *authctxt);
1.20 markus 281: int *enabled; /* flag in option struct that enables method */
282: int *batch_flag; /* flag in option struct that disables method */
283: };
284:
1.261 markus 285: int input_userauth_service_accept(int, u_int32_t, struct ssh *);
286: int input_userauth_ext_info(int, u_int32_t, struct ssh *);
287: int input_userauth_success(int, u_int32_t, struct ssh *);
288: int input_userauth_success_unexpected(int, u_int32_t, struct ssh *);
289: int input_userauth_failure(int, u_int32_t, struct ssh *);
290: int input_userauth_banner(int, u_int32_t, struct ssh *);
291: int input_userauth_error(int, u_int32_t, struct ssh *);
292: int input_userauth_info_req(int, u_int32_t, struct ssh *);
293: int input_userauth_pk_ok(int, u_int32_t, struct ssh *);
294: int input_userauth_passwd_changereq(int, u_int32_t, struct ssh *);
1.86 itojun 295:
296: int userauth_none(Authctxt *);
297: int userauth_pubkey(Authctxt *);
298: int userauth_passwd(Authctxt *);
299: int userauth_kbdint(Authctxt *);
300: int userauth_hostbased(Authctxt *);
1.20 markus 301:
1.121 markus 302: #ifdef GSSAPI
303: int userauth_gssapi(Authctxt *authctxt);
1.261 markus 304: int input_gssapi_response(int type, u_int32_t, struct ssh *);
305: int input_gssapi_token(int type, u_int32_t, struct ssh *);
306: int input_gssapi_hash(int type, u_int32_t, struct ssh *);
307: int input_gssapi_error(int, u_int32_t, struct ssh *);
308: int input_gssapi_errtok(int, u_int32_t, struct ssh *);
1.121 markus 309: #endif
310:
1.86 itojun 311: void userauth(Authctxt *, char *);
1.51 markus 312:
1.272 djm 313: static int sign_and_send_pubkey(struct ssh *ssh, Authctxt *, Identity *);
1.117 markus 314: static void pubkey_prepare(Authctxt *);
315: static void pubkey_cleanup(Authctxt *);
1.251 djm 316: static void pubkey_reset(Authctxt *);
1.259 markus 317: static struct sshkey *load_identity_file(Identity *);
1.76 itojun 318:
319: static Authmethod *authmethod_get(char *authlist);
320: static Authmethod *authmethod_lookup(const char *name);
321: static char *authmethods_get(void);
1.20 markus 322:
323: Authmethod authmethods[] = {
1.121 markus 324: #ifdef GSSAPI
1.132 markus 325: {"gssapi-with-mic",
1.121 markus 326: userauth_gssapi,
1.170 djm 327: NULL,
1.121 markus 328: &options.gss_authentication,
329: NULL},
330: #endif
1.81 markus 331: {"hostbased",
332: userauth_hostbased,
1.170 djm 333: NULL,
1.81 markus 334: &options.hostbased_authentication,
335: NULL},
1.20 markus 336: {"publickey",
337: userauth_pubkey,
1.170 djm 338: NULL,
1.28 markus 339: &options.pubkey_authentication,
1.20 markus 340: NULL},
1.81 markus 341: {"keyboard-interactive",
342: userauth_kbdint,
1.170 djm 343: NULL,
1.81 markus 344: &options.kbd_interactive_authentication,
345: &options.batch_mode},
1.20 markus 346: {"password",
347: userauth_passwd,
1.170 djm 348: NULL,
1.20 markus 349: &options.password_authentication,
1.23 markus 350: &options.batch_mode},
351: {"none",
352: userauth_none,
353: NULL,
1.170 djm 354: NULL,
1.23 markus 355: NULL},
1.170 djm 356: {NULL, NULL, NULL, NULL, NULL}
1.20 markus 357: };
358:
359: void
1.68 markus 360: ssh_userauth2(const char *local_user, const char *server_user, char *host,
1.100 markus 361: Sensitive *sensitive)
1.20 markus 362: {
1.231 markus 363: struct ssh *ssh = active_state;
1.20 markus 364: Authctxt authctxt;
1.231 markus 365: int r;
1.39 markus 366:
1.73 markus 367: if (options.challenge_response_authentication)
1.39 markus 368: options.kbd_interactive_authentication = 1;
1.53 markus 369: if (options.preferred_authentications == NULL)
370: options.preferred_authentications = authmethods_get();
371:
1.20 markus 372: /* setup authentication context */
1.82 markus 373: memset(&authctxt, 0, sizeof(authctxt));
1.117 markus 374: pubkey_prepare(&authctxt);
1.20 markus 375: authctxt.server_user = server_user;
1.68 markus 376: authctxt.local_user = local_user;
1.20 markus 377: authctxt.host = host;
378: authctxt.service = "ssh-connection"; /* service name */
379: authctxt.success = 0;
1.23 markus 380: authctxt.method = authmethod_lookup("none");
1.51 markus 381: authctxt.authlist = NULL;
1.121 markus 382: authctxt.methoddata = NULL;
1.100 markus 383: authctxt.sensitive = sensitive;
1.223 djm 384: authctxt.active_ktype = authctxt.oktypes = authctxt.ktypes = NULL;
1.82 markus 385: authctxt.info_req_seen = 0;
1.215 djm 386: authctxt.agent_fd = -1;
1.23 markus 387: if (authctxt.method == NULL)
388: fatal("ssh_userauth2: internal error: cannot send userauth none request");
1.20 markus 389:
1.231 markus 390: if ((r = sshpkt_start(ssh, SSH2_MSG_SERVICE_REQUEST)) != 0 ||
391: (r = sshpkt_put_cstring(ssh, "ssh-userauth")) != 0 ||
392: (r = sshpkt_send(ssh)) != 0)
393: fatal("%s: %s", __func__, ssh_err(r));
394:
1.260 markus 395: ssh->authctxt = &authctxt;
1.231 markus 396: ssh_dispatch_init(ssh, &input_userauth_error);
397: ssh_dispatch_set(ssh, SSH2_MSG_EXT_INFO, &input_userauth_ext_info);
398: ssh_dispatch_set(ssh, SSH2_MSG_SERVICE_ACCEPT, &input_userauth_service_accept);
1.263 markus 399: ssh_dispatch_run_fatal(ssh, DISPATCH_BLOCK, &authctxt.success); /* loop until success */
1.260 markus 400: ssh->authctxt = NULL;
1.20 markus 401:
1.117 markus 402: pubkey_cleanup(&authctxt);
1.231 markus 403: ssh_dispatch_range(ssh, SSH2_MSG_USERAUTH_MIN, SSH2_MSG_USERAUTH_MAX, NULL);
1.119 markus 404:
1.248 dtucker 405: if (!authctxt.success)
406: fatal("Authentication failed.");
1.109 markus 407: debug("Authentication succeeded (%s).", authctxt.method->name);
1.20 markus 408: }
1.119 markus 409:
1.231 markus 410: /* ARGSUSED */
411: int
1.261 markus 412: input_userauth_service_accept(int type, u_int32_t seq, struct ssh *ssh)
1.231 markus 413: {
1.260 markus 414: Authctxt *authctxt = ssh->authctxt;
1.231 markus 415: int r;
416:
417: if (ssh_packet_remaining(ssh) > 0) {
418: char *reply;
419:
420: if ((r = sshpkt_get_cstring(ssh, &reply, NULL)) != 0)
421: goto out;
422: debug2("service_accept: %s", reply);
423: free(reply);
424: } else {
425: debug2("buggy server: service_accept w/o service");
426: }
427: if ((r = sshpkt_get_end(ssh)) != 0)
428: goto out;
429: debug("SSH2_MSG_SERVICE_ACCEPT received");
430:
431: /* initial userauth request */
432: userauth_none(authctxt);
433:
434: ssh_dispatch_set(ssh, SSH2_MSG_EXT_INFO, &input_userauth_error);
435: ssh_dispatch_set(ssh, SSH2_MSG_USERAUTH_SUCCESS, &input_userauth_success);
436: ssh_dispatch_set(ssh, SSH2_MSG_USERAUTH_FAILURE, &input_userauth_failure);
437: ssh_dispatch_set(ssh, SSH2_MSG_USERAUTH_BANNER, &input_userauth_banner);
438: r = 0;
439: out:
440: return r;
441: }
442:
443: /* ARGSUSED */
444: int
1.261 markus 445: input_userauth_ext_info(int type, u_int32_t seqnr, struct ssh *ssh)
1.231 markus 446: {
1.261 markus 447: return kex_input_ext_info(type, seqnr, ssh);
1.231 markus 448: }
449:
1.20 markus 450: void
1.51 markus 451: userauth(Authctxt *authctxt, char *authlist)
452: {
1.278 markus 453: struct ssh *ssh = active_state; /* XXX */
454:
1.170 djm 455: if (authctxt->method != NULL && authctxt->method->cleanup != NULL)
456: authctxt->method->cleanup(authctxt);
457:
1.197 djm 458: free(authctxt->methoddata);
459: authctxt->methoddata = NULL;
1.51 markus 460: if (authlist == NULL) {
461: authlist = authctxt->authlist;
462: } else {
1.197 djm 463: free(authctxt->authlist);
1.51 markus 464: authctxt->authlist = authlist;
465: }
466: for (;;) {
467: Authmethod *method = authmethod_get(authlist);
468: if (method == NULL)
1.264 dtucker 469: fatal("%s@%s: Permission denied (%s).",
470: authctxt->server_user, authctxt->host, authlist);
1.51 markus 471: authctxt->method = method;
1.119 markus 472:
473: /* reset the per method handler */
1.278 markus 474: ssh_dispatch_range(ssh, SSH2_MSG_USERAUTH_PER_METHOD_MIN,
1.119 markus 475: SSH2_MSG_USERAUTH_PER_METHOD_MAX, NULL);
476:
477: /* and try new method */
1.51 markus 478: if (method->userauth(authctxt) != 0) {
479: debug2("we sent a %s packet, wait for reply", method->name);
480: break;
481: } else {
482: debug2("we did not send a packet, disable method");
483: method->enabled = NULL;
484: }
485: }
486: }
1.105 deraadt 487:
1.169 djm 488: /* ARGSUSED */
1.218 markus 489: int
1.261 markus 490: input_userauth_error(int type, u_int32_t seq, struct ssh *ssh)
1.20 markus 491: {
1.35 markus 492: fatal("input_userauth_error: bad message during authentication: "
1.140 djm 493: "type %d", 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: {
1.246 djm 501: char *msg, *lang;
1.166 djm 502: u_int len;
1.126 deraadt 503:
1.246 djm 504: debug3("%s", __func__);
505: msg = packet_get_string(&len);
1.35 markus 506: lang = packet_get_string(NULL);
1.246 djm 507: if (len > 0 && options.log_level >= SYSLOG_LEVEL_INFO)
508: fmprintf(stderr, "%s", msg);
509: free(msg);
1.197 djm 510: free(lang);
1.218 markus 511: return 0;
1.20 markus 512: }
1.105 deraadt 513:
1.169 djm 514: /* ARGSUSED */
1.218 markus 515: int
1.261 markus 516: input_userauth_success(int type, u_int32_t seq, struct ssh *ssh)
1.20 markus 517: {
1.260 markus 518: Authctxt *authctxt = ssh->authctxt;
1.172 djm 519:
1.20 markus 520: if (authctxt == NULL)
521: fatal("input_userauth_success: no authentication context");
1.197 djm 522: free(authctxt->authlist);
523: authctxt->authlist = NULL;
1.172 djm 524: if (authctxt->method != NULL && authctxt->method->cleanup != NULL)
525: authctxt->method->cleanup(authctxt);
1.197 djm 526: free(authctxt->methoddata);
527: authctxt->methoddata = NULL;
1.20 markus 528: authctxt->success = 1; /* break out */
1.218 markus 529: return 0;
1.20 markus 530: }
1.105 deraadt 531:
1.218 markus 532: int
1.261 markus 533: input_userauth_success_unexpected(int type, u_int32_t seq, struct ssh *ssh)
1.172 djm 534: {
1.260 markus 535: Authctxt *authctxt = ssh->authctxt;
1.172 djm 536:
537: if (authctxt == NULL)
538: fatal("%s: no authentication context", __func__);
539:
540: fatal("Unexpected authentication success during %s.",
541: authctxt->method->name);
1.218 markus 542: return 0;
1.172 djm 543: }
544:
1.169 djm 545: /* ARGSUSED */
1.218 markus 546: int
1.261 markus 547: input_userauth_failure(int type, u_int32_t seq, struct ssh *ssh)
1.20 markus 548: {
1.260 markus 549: Authctxt *authctxt = ssh->authctxt;
1.20 markus 550: char *authlist = NULL;
1.278 markus 551: u_char partial;
552: int r;
1.20 markus 553:
554: if (authctxt == NULL)
555: fatal("input_userauth_failure: no authentication context");
556:
1.278 markus 557: if ((r = sshpkt_get_cstring(ssh, &authlist, NULL)) != 0 ||
558: (r = sshpkt_get_u8(ssh, &partial)) != 0 ||
559: (r = sshpkt_get_end(ssh)) != 0)
560: goto out;
1.20 markus 561:
1.193 markus 562: if (partial != 0) {
1.247 dtucker 563: verbose("Authenticated with partial success.");
1.193 markus 564: /* reset state */
1.251 djm 565: pubkey_reset(authctxt);
1.193 markus 566: }
1.109 markus 567: debug("Authentications that can continue: %s", authlist);
1.20 markus 568:
1.51 markus 569: userauth(authctxt, authlist);
1.278 markus 570: authlist = NULL;
571: out:
572: free(authlist);
1.218 markus 573: return 0;
1.51 markus 574: }
1.169 djm 575:
1.287 djm 576: /*
577: * Format an identity for logging including filename, key type, fingerprint
578: * and location (agent, etc.). Caller must free.
579: */
580: static char *
581: format_identity(Identity *id)
582: {
583: char *fp = NULL, *ret = NULL;
584:
585: if (id->key != NULL) {
586: fp = sshkey_fingerprint(id->key, options.fingerprint_hash,
587: SSH_FP_DEFAULT);
588: }
589: xasprintf(&ret, "%s %s%s%s%s%s%s",
590: id->filename,
591: id->key ? sshkey_type(id->key) : "", id->key ? " " : "",
592: fp ? fp : "",
593: id->userprovided ? " explicit" : "",
594: (id->key && (id->key->flags & SSHKEY_FLAG_EXT)) ? " token" : "",
595: id->agent_fd != -1 ? " agent" : "");
596: free(fp);
597: return ret;
598: }
599:
1.169 djm 600: /* ARGSUSED */
1.218 markus 601: int
1.261 markus 602: input_userauth_pk_ok(int type, u_int32_t seq, struct ssh *ssh)
1.51 markus 603: {
1.260 markus 604: Authctxt *authctxt = ssh->authctxt;
1.259 markus 605: struct sshkey *key = NULL;
1.117 markus 606: Identity *id = NULL;
1.287 djm 607: int pktype, found = 0, sent = 0;
1.278 markus 608: size_t blen;
1.287 djm 609: char *pkalg = NULL, *fp = NULL, *ident = NULL;
1.278 markus 610: u_char *pkblob = NULL;
611: int r;
1.51 markus 612:
613: if (authctxt == NULL)
614: fatal("input_userauth_pk_ok: no authentication context");
1.267 djm 615:
1.278 markus 616: if ((r = sshpkt_get_cstring(ssh, &pkalg, NULL)) != 0 ||
617: (r = sshpkt_get_string(ssh, &pkblob, &blen)) != 0 ||
618: (r = sshpkt_get_end(ssh)) != 0)
619: goto done;
1.51 markus 620:
1.278 markus 621: if ((pktype = sshkey_type_from_name(pkalg)) == KEY_UNSPEC) {
1.287 djm 622: debug("%s: server sent unknown pkalg %s", __func__, pkalg);
1.117 markus 623: goto done;
624: }
1.278 markus 625: if ((r = sshkey_from_blob(pkblob, blen, &key)) != 0) {
626: debug("no key from blob. pkalg %s: %s", pkalg, ssh_err(r));
1.117 markus 627: goto done;
628: }
629: if (key->type != pktype) {
630: error("input_userauth_pk_ok: type mismatch "
631: "for decoded key (received %d, expected %d)",
632: key->type, pktype);
633: goto done;
634: }
635:
1.127 markus 636: /*
637: * search keys in the reverse order, because last candidate has been
638: * moved to the end of the queue. this also avoids confusion by
639: * duplicate keys
640: */
1.136 henning 641: TAILQ_FOREACH_REVERSE(id, &authctxt->keys, idlist, next) {
1.278 markus 642: if (sshkey_equal(key, id->key)) {
1.287 djm 643: found = 1;
1.51 markus 644: break;
645: }
1.117 markus 646: }
1.287 djm 647: if (!found || id == NULL) {
648: fp = sshkey_fingerprint(key, options.fingerprint_hash,
649: SSH_FP_DEFAULT);
650: error("%s: server replied with unknown key: %s %s", __func__,
651: sshkey_type(key), fp == NULL ? "<ERROR>" : fp);
652: goto done;
653: }
654: ident = format_identity(id);
655: debug("Server accepts key: %s", ident);
656: sent = sign_and_send_pubkey(ssh, authctxt, id);
1.278 markus 657: r = 0;
658: done:
659: sshkey_free(key);
1.287 djm 660: free(ident);
661: free(fp);
1.197 djm 662: free(pkalg);
663: free(pkblob);
1.51 markus 664:
1.106 deraadt 665: /* try another method if we did not send a packet */
1.278 markus 666: if (r == 0 && sent == 0)
1.51 markus 667: userauth(authctxt, NULL);
1.278 markus 668: return r;
1.20 markus 669: }
1.121 markus 670:
671: #ifdef GSSAPI
1.133 djm 672: int
1.121 markus 673: userauth_gssapi(Authctxt *authctxt)
674: {
1.278 markus 675: struct ssh *ssh = active_state; /* XXX */
1.121 markus 676: Gssctxt *gssctxt = NULL;
1.128 avsm 677: static gss_OID_set gss_supported = NULL;
1.139 djm 678: static u_int mech = 0;
1.121 markus 679: OM_uint32 min;
1.278 markus 680: int r, ok = 0;
1.121 markus 681:
682: /* Try one GSSAPI method at a time, rather than sending them all at
683: * once. */
684:
1.128 avsm 685: if (gss_supported == NULL)
686: gss_indicate_mechs(&min, &gss_supported);
1.121 markus 687:
688: /* Check to see if the mechanism is usable before we offer it */
1.128 avsm 689: while (mech < gss_supported->count && !ok) {
1.121 markus 690: /* My DER encoding requires length<128 */
1.128 avsm 691: if (gss_supported->elements[mech].length < 128 &&
1.271 djm 692: ssh_gssapi_check_mechanism(&gssctxt,
1.161 djm 693: &gss_supported->elements[mech], authctxt->host)) {
1.121 markus 694: ok = 1; /* Mechanism works */
695: } else {
696: mech++;
697: }
698: }
699:
1.161 djm 700: if (!ok)
1.139 djm 701: return 0;
1.121 markus 702:
703: authctxt->methoddata=(void *)gssctxt;
704:
1.278 markus 705: if ((r = sshpkt_start(ssh, SSH2_MSG_USERAUTH_REQUEST)) != 0 ||
706: (r = sshpkt_put_cstring(ssh, authctxt->server_user)) != 0 ||
707: (r = sshpkt_put_cstring(ssh, authctxt->service)) != 0 ||
708: (r = sshpkt_put_cstring(ssh, authctxt->method->name)) != 0 ||
709: (r = sshpkt_put_u32(ssh, 1)) != 0 ||
710: (r = sshpkt_put_u32(ssh,
711: (gss_supported->elements[mech].length) + 2)) != 0 ||
712: (r = sshpkt_put_u8(ssh, SSH_GSS_OIDTYPE)) != 0 ||
713: (r = sshpkt_put_u8(ssh,
714: gss_supported->elements[mech].length)) != 0 ||
715: (r = sshpkt_put(ssh,
716: gss_supported->elements[mech].elements,
717: gss_supported->elements[mech].length)) != 0 ||
718: (r = sshpkt_send(ssh)) != 0)
719: fatal("%s: %s", __func__, ssh_err(r));
720:
721: ssh_dispatch_set(ssh, SSH2_MSG_USERAUTH_GSSAPI_RESPONSE, &input_gssapi_response);
722: ssh_dispatch_set(ssh, SSH2_MSG_USERAUTH_GSSAPI_TOKEN, &input_gssapi_token);
723: ssh_dispatch_set(ssh, SSH2_MSG_USERAUTH_GSSAPI_ERROR, &input_gssapi_error);
724: ssh_dispatch_set(ssh, SSH2_MSG_USERAUTH_GSSAPI_ERRTOK, &input_gssapi_errtok);
1.121 markus 725:
726: mech++; /* Move along to next candidate */
727:
728: return 1;
729: }
730:
1.130 markus 731: static OM_uint32
1.262 djm 732: process_gssapi_token(struct ssh *ssh, gss_buffer_t recv_tok)
1.130 markus 733: {
1.260 markus 734: Authctxt *authctxt = ssh->authctxt;
1.130 markus 735: Gssctxt *gssctxt = authctxt->methoddata;
736: gss_buffer_desc send_tok = GSS_C_EMPTY_BUFFER;
1.142 djm 737: gss_buffer_desc mic = GSS_C_EMPTY_BUFFER;
738: gss_buffer_desc gssbuf;
1.132 markus 739: OM_uint32 status, ms, flags;
1.278 markus 740: int r;
1.133 djm 741:
1.130 markus 742: status = ssh_gssapi_init_ctx(gssctxt, options.gss_deleg_creds,
1.132 markus 743: recv_tok, &send_tok, &flags);
1.130 markus 744:
745: if (send_tok.length > 0) {
1.278 markus 746: u_char type = GSS_ERROR(status) ?
747: SSH2_MSG_USERAUTH_GSSAPI_ERRTOK :
748: SSH2_MSG_USERAUTH_GSSAPI_TOKEN;
749:
750: if ((r = sshpkt_start(ssh, type)) != 0 ||
751: (r = sshpkt_put_string(ssh, send_tok.value,
752: send_tok.length)) != 0 ||
753: (r = sshpkt_send(ssh)) != 0)
754: fatal("%s: %s", __func__, ssh_err(r));
1.133 djm 755:
1.130 markus 756: gss_release_buffer(&ms, &send_tok);
757: }
1.133 djm 758:
1.130 markus 759: if (status == GSS_S_COMPLETE) {
1.132 markus 760: /* send either complete or MIC, depending on mechanism */
761: if (!(flags & GSS_C_INTEG_FLAG)) {
1.278 markus 762: if ((r = sshpkt_start(ssh,
763: SSH2_MSG_USERAUTH_GSSAPI_EXCHANGE_COMPLETE)) != 0 ||
764: (r = sshpkt_send(ssh)) != 0)
765: fatal("%s: %s", __func__, ssh_err(r));
1.132 markus 766: } else {
1.278 markus 767: struct sshbuf *b;
768:
769: if ((b = sshbuf_new()) == NULL)
770: fatal("%s: sshbuf_new failed", __func__);
771: ssh_gssapi_buildmic(b, authctxt->server_user,
1.132 markus 772: authctxt->service, "gssapi-with-mic");
773:
1.278 markus 774: if ((gssbuf.value = sshbuf_mutable_ptr(b)) == NULL)
775: fatal("%s: sshbuf_mutable_ptr failed", __func__);
776: gssbuf.length = sshbuf_len(b);
1.133 djm 777:
1.132 markus 778: status = ssh_gssapi_sign(gssctxt, &gssbuf, &mic);
1.133 djm 779:
1.132 markus 780: if (!GSS_ERROR(status)) {
1.278 markus 781: if ((r = sshpkt_start(ssh,
782: SSH2_MSG_USERAUTH_GSSAPI_MIC)) != 0 ||
783: (r = sshpkt_put_string(ssh, mic.value,
784: mic.length)) != 0 ||
785: (r = sshpkt_send(ssh)) != 0)
786: fatal("%s: %s", __func__, ssh_err(r));
1.132 markus 787: }
1.133 djm 788:
1.278 markus 789: sshbuf_free(b);
1.132 markus 790: gss_release_buffer(&ms, &mic);
1.133 djm 791: }
1.130 markus 792: }
1.133 djm 793:
1.130 markus 794: return status;
795: }
796:
1.169 djm 797: /* ARGSUSED */
1.220 djm 798: int
1.261 markus 799: input_gssapi_response(int type, u_int32_t plen, struct ssh *ssh)
1.121 markus 800: {
1.260 markus 801: Authctxt *authctxt = ssh->authctxt;
1.121 markus 802: Gssctxt *gssctxt;
1.278 markus 803: size_t oidlen;
804: u_char *oidv = NULL;
805: int r;
1.121 markus 806:
807: if (authctxt == NULL)
808: fatal("input_gssapi_response: no authentication context");
809: gssctxt = authctxt->methoddata;
810:
811: /* Setup our OID */
1.278 markus 812: if ((r = sshpkt_get_string(ssh, &oidv, &oidlen)) != 0)
813: goto done;
1.121 markus 814:
1.129 markus 815: if (oidlen <= 2 ||
816: oidv[0] != SSH_GSS_OIDTYPE ||
817: oidv[1] != oidlen - 2) {
818: debug("Badly encoded mechanism OID received");
819: userauth(authctxt, NULL);
1.278 markus 820: goto ok;
1.121 markus 821: }
1.129 markus 822:
823: if (!ssh_gssapi_check_oid(gssctxt, oidv + 2, oidlen - 2))
824: fatal("Server returned different OID than expected");
1.121 markus 825:
1.278 markus 826: if ((r = sshpkt_get_end(ssh)) != 0)
827: goto done;
1.121 markus 828:
1.262 djm 829: if (GSS_ERROR(process_gssapi_token(ssh, GSS_C_NO_BUFFER))) {
1.121 markus 830: /* Start again with next method on list */
831: debug("Trying to start again");
832: userauth(authctxt, NULL);
1.278 markus 833: goto ok;
1.121 markus 834: }
1.278 markus 835: ok:
836: r = 0;
837: done:
838: free(oidv);
839: return r;
1.121 markus 840: }
841:
1.169 djm 842: /* ARGSUSED */
1.220 djm 843: int
1.261 markus 844: input_gssapi_token(int type, u_int32_t plen, struct ssh *ssh)
1.121 markus 845: {
1.260 markus 846: Authctxt *authctxt = ssh->authctxt;
1.121 markus 847: gss_buffer_desc recv_tok;
1.278 markus 848: u_char *p = NULL;
849: size_t len;
1.130 markus 850: OM_uint32 status;
1.278 markus 851: int r;
1.121 markus 852:
853: if (authctxt == NULL)
854: fatal("input_gssapi_response: no authentication context");
855:
1.278 markus 856: if ((r = sshpkt_get_string(ssh, &p, &len)) != 0 ||
857: (r = sshpkt_get_end(ssh)) != 0)
858: goto out;
1.121 markus 859:
1.278 markus 860: recv_tok.value = p;
861: recv_tok.length = len;
1.262 djm 862: status = process_gssapi_token(ssh, &recv_tok);
1.121 markus 863:
1.278 markus 864: /* Start again with the next method in the list */
1.121 markus 865: if (GSS_ERROR(status)) {
866: userauth(authctxt, NULL);
1.278 markus 867: /* ok */
1.121 markus 868: }
1.278 markus 869: r = 0;
870: out:
871: free(p);
872: return r;
1.121 markus 873: }
874:
1.169 djm 875: /* ARGSUSED */
1.220 djm 876: int
1.261 markus 877: input_gssapi_errtok(int type, u_int32_t plen, struct ssh *ssh)
1.121 markus 878: {
1.260 markus 879: Authctxt *authctxt = ssh->authctxt;
1.121 markus 880: Gssctxt *gssctxt;
881: gss_buffer_desc send_tok = GSS_C_EMPTY_BUFFER;
882: gss_buffer_desc recv_tok;
1.194 djm 883: OM_uint32 ms;
1.278 markus 884: u_char *p = NULL;
885: size_t len;
886: int r;
1.121 markus 887:
888: if (authctxt == NULL)
889: fatal("input_gssapi_response: no authentication context");
890: gssctxt = authctxt->methoddata;
891:
1.278 markus 892: if ((r = sshpkt_get_string(ssh, &p, &len)) != 0 ||
893: (r = sshpkt_get_end(ssh)) != 0) {
894: free(p);
895: return r;
896: }
1.121 markus 897:
898: /* Stick it into GSSAPI and see what it says */
1.278 markus 899: recv_tok.value = p;
900: recv_tok.length = len;
1.194 djm 901: (void)ssh_gssapi_init_ctx(gssctxt, options.gss_deleg_creds,
1.140 djm 902: &recv_tok, &send_tok, NULL);
1.278 markus 903: free(p);
1.121 markus 904: gss_release_buffer(&ms, &send_tok);
905:
906: /* Server will be returning a failed packet after this one */
1.220 djm 907: return 0;
1.121 markus 908: }
909:
1.169 djm 910: /* ARGSUSED */
1.220 djm 911: int
1.261 markus 912: input_gssapi_error(int type, u_int32_t plen, struct ssh *ssh)
1.121 markus 913: {
1.278 markus 914: char *msg = NULL;
915: char *lang = NULL;
916: int r;
1.121 markus 917:
1.278 markus 918: if ((r = sshpkt_get_u32(ssh, NULL)) != 0 || /* maj */
919: (r = sshpkt_get_u32(ssh, NULL)) != 0 || /* min */
920: (r = sshpkt_get_cstring(ssh, &msg, NULL)) != 0 ||
921: (r = sshpkt_get_cstring(ssh, &lang, NULL)) != 0)
922: goto out;
923: r = sshpkt_get_end(ssh);
1.143 stevesk 924: debug("Server GSSAPI Error:\n%s", msg);
1.278 markus 925: out:
1.197 djm 926: free(msg);
927: free(lang);
1.278 markus 928: return r;
1.121 markus 929: }
930: #endif /* GSSAPI */
1.20 markus 931:
1.1 markus 932: int
1.23 markus 933: userauth_none(Authctxt *authctxt)
934: {
1.278 markus 935: struct ssh *ssh = active_state; /* XXX */
936: int r;
937:
1.23 markus 938: /* initial userauth request */
1.278 markus 939: if ((r = sshpkt_start(ssh, SSH2_MSG_USERAUTH_REQUEST)) != 0 ||
940: (r = sshpkt_put_cstring(ssh, authctxt->server_user)) != 0 ||
941: (r = sshpkt_put_cstring(ssh, authctxt->service)) != 0 ||
942: (r = sshpkt_put_cstring(ssh, authctxt->method->name)) != 0 ||
943: (r = sshpkt_send(ssh)) != 0)
944: fatal("%s: %s", __func__, ssh_err(r));
1.23 markus 945: return 1;
946: }
947:
948: int
1.20 markus 949: userauth_passwd(Authctxt *authctxt)
1.1 markus 950: {
1.278 markus 951: struct ssh *ssh = active_state; /* XXX */
1.6 markus 952: static int attempt = 0;
1.266 dtucker 953: char prompt[256];
1.1 markus 954: char *password;
1.175 dtucker 955: const char *host = options.host_key_alias ? options.host_key_alias :
956: authctxt->host;
1.278 markus 957: int r;
1.6 markus 958:
1.13 todd 959: if (attempt++ >= options.number_of_password_prompts)
1.6 markus 960: return 0;
1.13 todd 961:
1.87 deraadt 962: if (attempt != 1)
1.13 todd 963: error("Permission denied, please try again.");
1.1 markus 964:
1.43 itojun 965: snprintf(prompt, sizeof(prompt), "%.30s@%.128s's password: ",
1.175 dtucker 966: 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:
1.278 markus 978: if (password)
979: freezero(password, strlen(password));
980:
981: ssh_dispatch_set(ssh, SSH2_MSG_USERAUTH_PASSWD_CHANGEREQ,
1.99 markus 982: &input_userauth_passwd_changereq);
983:
1.1 markus 984: return 1;
985: }
1.169 djm 986:
1.99 markus 987: /*
988: * parse PASSWD_CHANGEREQ, prompt user and send SSH2_MSG_USERAUTH_REQUEST
989: */
1.169 djm 990: /* ARGSUSED */
1.218 markus 991: int
1.261 markus 992: input_userauth_passwd_changereq(int type, u_int32_t seqnr, struct ssh *ssh)
1.99 markus 993: {
1.260 markus 994: Authctxt *authctxt = ssh->authctxt;
1.278 markus 995: char *info = NULL, *lang = NULL, *password = NULL, *retype = NULL;
1.266 dtucker 996: char prompt[256];
1.252 djm 997: const char *host;
1.278 markus 998: int r;
1.99 markus 999:
1000: debug2("input_userauth_passwd_changereq");
1001:
1002: if (authctxt == NULL)
1003: fatal("input_userauth_passwd_changereq: "
1004: "no authentication context");
1.252 djm 1005: host = options.host_key_alias ? options.host_key_alias : authctxt->host;
1.99 markus 1006:
1.278 markus 1007: if ((r = sshpkt_get_cstring(ssh, &info, NULL)) != 0 ||
1008: (r = sshpkt_get_cstring(ssh, &lang, NULL)) != 0)
1009: goto out;
1.99 markus 1010: if (strlen(info) > 0)
1.116 itojun 1011: logit("%s", info);
1.278 markus 1012: if ((r = sshpkt_start(ssh, SSH2_MSG_USERAUTH_REQUEST)) != 0 ||
1013: (r = sshpkt_put_cstring(ssh, authctxt->server_user)) != 0 ||
1014: (r = sshpkt_put_cstring(ssh, authctxt->service)) != 0 ||
1015: (r = sshpkt_put_cstring(ssh, authctxt->method->name)) != 0 ||
1016: (r = sshpkt_put_u8(ssh, 1)) != 0) /* additional info */
1017: goto out;
1018:
1.104 deraadt 1019: snprintf(prompt, sizeof(prompt),
1.99 markus 1020: "Enter %.30s@%.128s's old password: ",
1.175 dtucker 1021: authctxt->server_user, host);
1.99 markus 1022: password = read_passphrase(prompt, 0);
1.278 markus 1023: if ((r = sshpkt_put_cstring(ssh, password)) != 0)
1024: goto out;
1025:
1026: freezero(password, strlen(password));
1.99 markus 1027: password = NULL;
1028: while (password == NULL) {
1.104 deraadt 1029: snprintf(prompt, sizeof(prompt),
1.99 markus 1030: "Enter %.30s@%.128s's new password: ",
1.175 dtucker 1031: authctxt->server_user, host);
1.99 markus 1032: password = read_passphrase(prompt, RP_ALLOW_EOF);
1033: if (password == NULL) {
1034: /* bail out */
1.278 markus 1035: r = 0;
1036: goto out;
1.99 markus 1037: }
1.104 deraadt 1038: snprintf(prompt, sizeof(prompt),
1.99 markus 1039: "Retype %.30s@%.128s's new password: ",
1.175 dtucker 1040: authctxt->server_user, host);
1.99 markus 1041: retype = read_passphrase(prompt, 0);
1042: if (strcmp(password, retype) != 0) {
1.278 markus 1043: freezero(password, strlen(password));
1.116 itojun 1044: logit("Mismatch; try again, EOF to quit.");
1.99 markus 1045: password = NULL;
1046: }
1.278 markus 1047: freezero(retype, strlen(retype));
1.99 markus 1048: }
1.278 markus 1049: if ((r = sshpkt_put_cstring(ssh, password)) != 0 ||
1050: (r = sshpkt_add_padding(ssh, 64)) != 0 ||
1051: (r = sshpkt_send(ssh)) != 0)
1052: goto out;
1.104 deraadt 1053:
1.278 markus 1054: ssh_dispatch_set(ssh, SSH2_MSG_USERAUTH_PASSWD_CHANGEREQ,
1.99 markus 1055: &input_userauth_passwd_changereq);
1.278 markus 1056: r = 0;
1057: out:
1058: if (password)
1059: freezero(password, strlen(password));
1060: free(info);
1061: free(lang);
1062: return r;
1.117 markus 1063: }
1064:
1.272 djm 1065: /*
1066: * Select an algorithm for publickey signatures.
1067: * Returns algorithm (caller must free) or NULL if no mutual algorithm found.
1068: *
1069: * Call with ssh==NULL to ignore server-sig-algs extension list and
1070: * only attempt with the key's base signature type.
1071: */
1072: static char *
1073: key_sig_algorithm(struct ssh *ssh, const struct sshkey *key)
1.231 markus 1074: {
1.274 djm 1075: char *allowed, *oallowed, *cp, *tmp, *alg = NULL;
1.231 markus 1076:
1.272 djm 1077: /*
1078: * The signature algorithm will only differ from the key algorithm
1079: * for RSA keys/certs and when the server advertises support for
1080: * newer (SHA2) algorithms.
1081: */
1082: if (ssh == NULL || ssh->kex->server_sig_algs == NULL ||
1.288 ! djm 1083: (key->type != KEY_RSA && key->type != KEY_RSA_CERT) ||
! 1084: (key->type == KEY_RSA_CERT && (datafellows & SSH_BUG_SIGTYPE))) {
1.272 djm 1085: /* Filter base key signature alg against our configuration */
1.279 markus 1086: return match_list(sshkey_ssh_name(key),
1.272 djm 1087: options.pubkey_key_types, NULL);
1.231 markus 1088: }
1089:
1.272 djm 1090: /*
1091: * For RSA keys/certs, since these might have a different sig type:
1092: * find the first entry in PubkeyAcceptedKeyTypes of the right type
1093: * that also appears in the supported signature algorithms list from
1094: * the server.
1095: */
1096: oallowed = allowed = xstrdup(options.pubkey_key_types);
1097: while ((cp = strsep(&allowed, ",")) != NULL) {
1098: if (sshkey_type_from_name(cp) != key->type)
1099: continue;
1.274 djm 1100: tmp = match_list(sshkey_sigalg_by_name(cp), ssh->kex->server_sig_algs, NULL);
1101: if (tmp != NULL)
1102: alg = xstrdup(cp);
1103: free(tmp);
1.272 djm 1104: if (alg != NULL)
1105: break;
1.269 djm 1106: }
1.272 djm 1107: free(oallowed);
1108: return alg;
1.269 djm 1109: }
1110:
1.117 markus 1111: static int
1.214 djm 1112: identity_sign(struct identity *id, u_char **sigp, size_t *lenp,
1.272 djm 1113: const u_char *data, size_t datalen, u_int compat, const char *alg)
1.117 markus 1114: {
1.259 markus 1115: struct sshkey *prv;
1.269 djm 1116: int r;
1.99 markus 1117:
1.272 djm 1118: /* The agent supports this key. */
1.269 djm 1119: if (id->key != NULL && id->agent_fd != -1) {
1.272 djm 1120: return ssh_agent_sign(id->agent_fd, id->key, sigp, lenp,
1121: data, datalen, alg, compat);
1.269 djm 1122: }
1.214 djm 1123:
1.117 markus 1124: /*
1.272 djm 1125: * We have already loaded the private key or the private key is
1126: * stored in external hardware.
1.117 markus 1127: */
1.255 djm 1128: if (id->key != NULL &&
1.272 djm 1129: (id->isprivate || (id->key->flags & SSHKEY_FLAG_EXT))) {
1130: if ((r = sshkey_sign(id->key, sigp, lenp, data, datalen,
1131: alg, compat)) != 0)
1132: return r;
1133: /*
1134: * PKCS#11 tokens may not support all signature algorithms,
1135: * so check what we get back.
1136: */
1137: if ((r = sshkey_check_sigtype(*sigp, *lenp, alg)) != 0)
1138: return r;
1139: return 0;
1140: }
1.255 djm 1141:
1.272 djm 1142: /* Load the private key from the file. */
1.229 jcs 1143: if ((prv = load_identity_file(id)) == NULL)
1.239 djm 1144: return SSH_ERR_KEY_NOT_FOUND;
1.265 djm 1145: if (id->key != NULL && !sshkey_equal_public(prv, id->key)) {
1146: error("%s: private key %s contents do not match public",
1147: __func__, id->filename);
1148: return SSH_ERR_KEY_NOT_FOUND;
1149: }
1.272 djm 1150: r = sshkey_sign(prv, sigp, lenp, data, datalen, alg, compat);
1.214 djm 1151: sshkey_free(prv);
1.269 djm 1152: return r;
1.51 markus 1153: }
1154:
1.76 itojun 1155: static int
1.255 djm 1156: id_filename_matches(Identity *id, Identity *private_id)
1157: {
1158: const char *suffixes[] = { ".pub", "-cert.pub", NULL };
1159: size_t len = strlen(id->filename), plen = strlen(private_id->filename);
1160: size_t i, slen;
1161:
1162: if (strcmp(id->filename, private_id->filename) == 0)
1163: return 1;
1164: for (i = 0; suffixes[i]; i++) {
1165: slen = strlen(suffixes[i]);
1166: if (len > slen && plen == len - slen &&
1167: strcmp(id->filename + (len - slen), suffixes[i]) == 0 &&
1168: memcmp(id->filename, private_id->filename, plen) == 0)
1169: return 1;
1170: }
1171: return 0;
1172: }
1173:
1174: static int
1.272 djm 1175: sign_and_send_pubkey(struct ssh *ssh, Authctxt *authctxt, Identity *id)
1.1 markus 1176: {
1.272 djm 1177: struct sshbuf *b = NULL;
1178: Identity *private_id, *sign_id = NULL;
1179: u_char *signature = NULL;
1180: size_t slen = 0, skip = 0;
1181: int r, fallback_sigtype, sent = 0;
1182: char *alg = NULL, *fp = NULL;
1183: const char *loc = "";
1.1 markus 1184:
1.222 djm 1185: if ((fp = sshkey_fingerprint(id->key, options.fingerprint_hash,
1186: SSH_FP_DEFAULT)) == NULL)
1187: return 0;
1.51 markus 1188:
1.272 djm 1189: debug3("%s: %s %s", __func__, sshkey_type(id->key), fp);
1.1 markus 1190:
1.227 djm 1191: /*
1192: * If the key is an certificate, try to find a matching private key
1193: * and use it to complete the signature.
1.241 djm 1194: * If no such private key exists, fall back to trying the certificate
1195: * key itself in case it has a private half already loaded.
1.272 djm 1196: * This will try to set sign_id to the private key that will perform
1197: * the signature.
1.227 djm 1198: */
1.272 djm 1199: if (sshkey_is_cert(id->key)) {
1.227 djm 1200: TAILQ_FOREACH(private_id, &authctxt->keys, next) {
1201: if (sshkey_equal_public(id->key, private_id->key) &&
1202: id->key->type != private_id->key->type) {
1.272 djm 1203: sign_id = private_id;
1.227 djm 1204: break;
1205: }
1206: }
1.255 djm 1207: /*
1208: * Exact key matches are preferred, but also allow
1209: * filename matches for non-PKCS#11/agent keys that
1210: * didn't load public keys. This supports the case
1211: * of keeping just a private key file and public
1212: * certificate on disk.
1213: */
1.272 djm 1214: if (sign_id == NULL &&
1215: !id->isprivate && id->agent_fd == -1 &&
1.255 djm 1216: (id->key->flags & SSHKEY_FLAG_EXT) == 0) {
1217: TAILQ_FOREACH(private_id, &authctxt->keys, next) {
1218: if (private_id->key == NULL &&
1219: id_filename_matches(id, private_id)) {
1.272 djm 1220: sign_id = private_id;
1.255 djm 1221: break;
1222: }
1223: }
1224: }
1.272 djm 1225: if (sign_id != NULL) {
1.227 djm 1226: debug2("%s: using private key \"%s\"%s for "
1227: "certificate", __func__, id->filename,
1228: id->agent_fd != -1 ? " from agent" : "");
1229: } else {
1.240 djm 1230: debug("%s: no separate private key for certificate "
1.227 djm 1231: "\"%s\"", __func__, id->filename);
1232: }
1233: }
1234:
1.272 djm 1235: /*
1236: * If the above didn't select another identity to do the signing
1237: * then default to the one we started with.
1238: */
1239: if (sign_id == NULL)
1240: sign_id = id;
1241:
1242: /* assemble and sign data */
1243: for (fallback_sigtype = 0; fallback_sigtype <= 1; fallback_sigtype++) {
1244: free(alg);
1245: slen = 0;
1246: signature = NULL;
1247: if ((alg = key_sig_algorithm(fallback_sigtype ? NULL : ssh,
1248: id->key)) == NULL) {
1249: error("%s: no mutual signature supported", __func__);
1250: goto out;
1251: }
1252: debug3("%s: signing using %s", __func__, alg);
1253:
1254: sshbuf_free(b);
1255: if ((b = sshbuf_new()) == NULL)
1256: fatal("%s: sshbuf_new failed", __func__);
1257: if (datafellows & SSH_OLD_SESSIONID) {
1258: if ((r = sshbuf_put(b, session_id2,
1259: session_id2_len)) != 0) {
1260: fatal("%s: sshbuf_put: %s",
1261: __func__, ssh_err(r));
1262: }
1263: } else {
1264: if ((r = sshbuf_put_string(b, session_id2,
1265: session_id2_len)) != 0) {
1266: fatal("%s: sshbuf_put_string: %s",
1267: __func__, ssh_err(r));
1268: }
1269: }
1.278 markus 1270: skip = sshbuf_len(b);
1.272 djm 1271: if ((r = sshbuf_put_u8(b, SSH2_MSG_USERAUTH_REQUEST)) != 0 ||
1272: (r = sshbuf_put_cstring(b, authctxt->server_user)) != 0 ||
1273: (r = sshbuf_put_cstring(b, authctxt->service)) != 0 ||
1274: (r = sshbuf_put_cstring(b, authctxt->method->name)) != 0 ||
1275: (r = sshbuf_put_u8(b, 1)) != 0 ||
1276: (r = sshbuf_put_cstring(b, alg)) != 0 ||
1277: (r = sshkey_puts(id->key, b)) != 0) {
1278: fatal("%s: assemble signed data: %s",
1279: __func__, ssh_err(r));
1280: }
1281:
1282: /* generate signature */
1283: r = identity_sign(sign_id, &signature, &slen,
1284: sshbuf_ptr(b), sshbuf_len(b), datafellows, alg);
1285: if (r == 0)
1286: break;
1287: else if (r == SSH_ERR_KEY_NOT_FOUND)
1288: goto out; /* soft failure */
1289: else if (r == SSH_ERR_SIGN_ALG_UNSUPPORTED &&
1290: !fallback_sigtype) {
1291: if (sign_id->agent_fd != -1)
1292: loc = "agent ";
1293: else if ((sign_id->key->flags & SSHKEY_FLAG_EXT) != 0)
1294: loc = "token ";
1295: logit("%skey %s %s returned incorrect signature type",
1296: loc, sshkey_type(id->key), fp);
1297: continue;
1298: }
1299: error("%s: signing failed: %s", __func__, ssh_err(r));
1300: goto out;
1.17 markus 1301: }
1.272 djm 1302: if (slen == 0 || signature == NULL) /* shouldn't happen */
1303: fatal("%s: no signature", __func__);
1.51 markus 1304:
1.1 markus 1305: /* append signature */
1.272 djm 1306: if ((r = sshbuf_put_string(b, signature, slen)) != 0)
1307: fatal("%s: append signature: %s", __func__, ssh_err(r));
1.1 markus 1308:
1.272 djm 1309: #ifdef DEBUG_PK
1310: sshbuf_dump(b, stderr);
1311: #endif
1.1 markus 1312: /* skip session id and packet type */
1.272 djm 1313: if ((r = sshbuf_consume(b, skip + 1)) != 0)
1314: fatal("%s: consume: %s", __func__, ssh_err(r));
1.1 markus 1315:
1316: /* put remaining data from buffer into packet */
1.272 djm 1317: if ((r = sshpkt_start(ssh, SSH2_MSG_USERAUTH_REQUEST)) != 0 ||
1318: (r = sshpkt_putb(ssh, b)) != 0 ||
1319: (r = sshpkt_send(ssh)) != 0)
1320: fatal("%s: enqueue request: %s", __func__, ssh_err(r));
1321:
1322: /* success */
1323: sent = 1;
1.17 markus 1324:
1.272 djm 1325: out:
1326: free(fp);
1327: free(alg);
1328: sshbuf_free(b);
1329: freezero(signature, slen);
1330: return sent;
1.16 markus 1331: }
1332:
1.76 itojun 1333: static int
1.272 djm 1334: send_pubkey_test(struct ssh *ssh, Authctxt *authctxt, Identity *id)
1.20 markus 1335: {
1.272 djm 1336: u_char *blob = NULL;
1337: char *alg = NULL;
1.278 markus 1338: size_t bloblen;
1339: u_int have_sig = 0;
1340: int sent = 0, r;
1.20 markus 1341:
1.272 djm 1342: if ((alg = key_sig_algorithm(ssh, id->key)) == NULL) {
1343: debug("%s: no mutual signature algorithm", __func__);
1344: goto out;
1345: }
1.16 markus 1346:
1.278 markus 1347: if ((r = sshkey_to_blob(id->key, &blob, &bloblen)) != 0) {
1.51 markus 1348: /* we cannot handle this key */
1.272 djm 1349: debug3("%s: cannot handle key", __func__);
1350: goto out;
1.16 markus 1351: }
1.51 markus 1352: /* register callback for USERAUTH_PK_OK message */
1.278 markus 1353: ssh_dispatch_set(ssh, SSH2_MSG_USERAUTH_PK_OK, &input_userauth_pk_ok);
1.51 markus 1354:
1.278 markus 1355: if ((r = sshpkt_start(ssh, SSH2_MSG_USERAUTH_REQUEST)) != 0 ||
1356: (r = sshpkt_put_cstring(ssh, authctxt->server_user)) != 0 ||
1357: (r = sshpkt_put_cstring(ssh, authctxt->service)) != 0 ||
1358: (r = sshpkt_put_cstring(ssh, authctxt->method->name)) != 0 ||
1359: (r = sshpkt_put_u8(ssh, have_sig)) != 0 ||
1360: (r = sshpkt_put_cstring(ssh, alg)) != 0 ||
1361: (r = sshpkt_put_string(ssh, blob, bloblen)) != 0 ||
1362: (r = sshpkt_send(ssh)) != 0)
1363: fatal("%s: %s", __func__, ssh_err(r));
1.272 djm 1364: sent = 1;
1.278 markus 1365:
1366: out:
1.272 djm 1367: free(alg);
1.197 djm 1368: free(blob);
1.272 djm 1369: return sent;
1.51 markus 1370: }
1371:
1.259 markus 1372: static struct sshkey *
1.229 jcs 1373: load_identity_file(Identity *id)
1.51 markus 1374: {
1.259 markus 1375: struct sshkey *private = NULL;
1.229 jcs 1376: char prompt[300], *passphrase, *comment;
1.215 djm 1377: int r, perm_ok = 0, quit = 0, i;
1.52 markus 1378: struct stat st;
1.16 markus 1379:
1.229 jcs 1380: if (stat(id->filename, &st) < 0) {
1381: (id->userprovided ? logit : debug3)("no such identity: %s: %s",
1382: id->filename, strerror(errno));
1.52 markus 1383: return NULL;
1384: }
1.214 djm 1385: snprintf(prompt, sizeof prompt,
1.229 jcs 1386: "Enter passphrase for key '%.100s': ", id->filename);
1.214 djm 1387: for (i = 0; i <= options.number_of_password_prompts; i++) {
1388: if (i == 0)
1389: passphrase = "";
1390: else {
1.20 markus 1391: passphrase = read_passphrase(prompt, 0);
1.214 djm 1392: if (*passphrase == '\0') {
1.20 markus 1393: debug2("no passphrase given, try next key");
1.214 djm 1394: free(passphrase);
1395: break;
1396: }
1397: }
1.229 jcs 1398: switch ((r = sshkey_load_private_type(KEY_UNSPEC, id->filename,
1399: passphrase, &private, &comment, &perm_ok))) {
1.214 djm 1400: case 0:
1401: break;
1402: case SSH_ERR_KEY_WRONG_PASSPHRASE:
1403: if (options.batch_mode) {
1404: quit = 1;
1405: break;
1406: }
1.215 djm 1407: if (i != 0)
1408: debug2("bad passphrase given, try again...");
1.214 djm 1409: break;
1410: case SSH_ERR_SYSTEM_ERROR:
1411: if (errno == ENOENT) {
1412: debug2("Load key \"%s\": %s",
1.229 jcs 1413: id->filename, ssh_err(r));
1.51 markus 1414: quit = 1;
1.214 djm 1415: break;
1.20 markus 1416: }
1.214 djm 1417: /* FALLTHROUGH */
1418: default:
1.229 jcs 1419: error("Load key \"%s\": %s", id->filename, ssh_err(r));
1.214 djm 1420: quit = 1;
1421: break;
1422: }
1.230 djm 1423: if (!quit && private != NULL && id->agent_fd == -1 &&
1.229 jcs 1424: !(id->key && id->isprivate))
1425: maybe_add_key_to_agent(id->filename, private, comment,
1426: passphrase);
1.278 markus 1427: if (i > 0)
1428: freezero(passphrase, strlen(passphrase));
1.232 mmcc 1429: free(comment);
1.214 djm 1430: if (private != NULL || quit)
1431: break;
1.16 markus 1432: }
1.51 markus 1433: return private;
1434: }
1435:
1.272 djm 1436: static int
1437: key_type_allowed_by_config(struct sshkey *key)
1438: {
1439: if (match_pattern_list(sshkey_ssh_name(key),
1440: options.pubkey_key_types, 0) == 1)
1441: return 1;
1442:
1443: /* RSA keys/certs might be allowed by alternate signature types */
1444: switch (key->type) {
1445: case KEY_RSA:
1446: if (match_pattern_list("rsa-sha2-512",
1447: options.pubkey_key_types, 0) == 1)
1448: return 1;
1449: if (match_pattern_list("rsa-sha2-256",
1450: options.pubkey_key_types, 0) == 1)
1451: return 1;
1452: break;
1453: case KEY_RSA_CERT:
1454: if (match_pattern_list("rsa-sha2-512-cert-v01@openssh.com",
1455: options.pubkey_key_types, 0) == 1)
1456: return 1;
1457: if (match_pattern_list("rsa-sha2-256-cert-v01@openssh.com",
1458: options.pubkey_key_types, 0) == 1)
1459: return 1;
1460: break;
1461: }
1462: return 0;
1463: }
1464:
1465:
1.117 markus 1466: /*
1467: * try keys in the following order:
1.227 djm 1468: * 1. certificates listed in the config file
1469: * 2. other input certificates
1470: * 3. agent keys that are found in the config file
1471: * 4. other agent keys
1472: * 5. keys that are only listed in the config file
1.117 markus 1473: */
1474: static void
1475: pubkey_prepare(Authctxt *authctxt)
1.51 markus 1476: {
1.214 djm 1477: struct identity *id, *id2, *tmp;
1478: struct idlist agent, files, *preferred;
1479: struct sshkey *key;
1.230 djm 1480: int agent_fd = -1, i, r, found;
1.214 djm 1481: size_t j;
1482: struct ssh_identitylist *idlist;
1.287 djm 1483: char *ident;
1.51 markus 1484:
1.117 markus 1485: TAILQ_INIT(&agent); /* keys from the agent */
1486: TAILQ_INIT(&files); /* keys from the config file */
1487: preferred = &authctxt->keys;
1488: TAILQ_INIT(preferred); /* preferred order of keys */
1489:
1.190 djm 1490: /* list of keys stored in the filesystem and PKCS#11 */
1.117 markus 1491: for (i = 0; i < options.num_identity_files; i++) {
1492: key = options.identity_keys[i];
1.180 djm 1493: if (key && key->cert && key->cert->type != SSH2_CERT_TYPE_USER)
1.117 markus 1494: continue;
1495: options.identity_keys[i] = NULL;
1.150 djm 1496: id = xcalloc(1, sizeof(*id));
1.230 djm 1497: id->agent_fd = -1;
1.117 markus 1498: id->key = key;
1499: id->filename = xstrdup(options.identity_files[i]);
1.192 dtucker 1500: id->userprovided = options.identity_file_userprovided[i];
1.117 markus 1501: TAILQ_INSERT_TAIL(&files, id, next);
1.190 djm 1502: }
1.227 djm 1503: /* list of certificates specified by user */
1504: for (i = 0; i < options.num_certificate_files; i++) {
1505: key = options.certificates[i];
1.278 markus 1506: if (!sshkey_is_cert(key) || key->cert == NULL ||
1.227 djm 1507: key->cert->type != SSH2_CERT_TYPE_USER)
1508: continue;
1509: id = xcalloc(1, sizeof(*id));
1.230 djm 1510: id->agent_fd = -1;
1.227 djm 1511: id->key = key;
1512: id->filename = xstrdup(options.certificate_files[i]);
1513: id->userprovided = options.certificate_file_userprovided[i];
1514: TAILQ_INSERT_TAIL(preferred, id, next);
1.117 markus 1515: }
1516: /* list of keys supported by the agent */
1.214 djm 1517: if ((r = ssh_get_authentication_socket(&agent_fd)) != 0) {
1518: if (r != SSH_ERR_AGENT_NOT_PRESENT)
1519: debug("%s: ssh_get_authentication_socket: %s",
1520: __func__, ssh_err(r));
1.258 naddy 1521: } else if ((r = ssh_fetch_identitylist(agent_fd, &idlist)) != 0) {
1.214 djm 1522: if (r != SSH_ERR_AGENT_NO_IDENTITIES)
1523: debug("%s: ssh_fetch_identitylist: %s",
1524: __func__, ssh_err(r));
1.237 markus 1525: close(agent_fd);
1.214 djm 1526: } else {
1527: for (j = 0; j < idlist->nkeys; j++) {
1.117 markus 1528: found = 0;
1529: TAILQ_FOREACH(id, &files, next) {
1.214 djm 1530: /*
1531: * agent keys from the config file are
1532: * preferred
1533: */
1534: if (sshkey_equal(idlist->keys[j], id->key)) {
1.117 markus 1535: TAILQ_REMOVE(&files, id, next);
1536: TAILQ_INSERT_TAIL(preferred, id, next);
1.214 djm 1537: id->agent_fd = agent_fd;
1.117 markus 1538: found = 1;
1539: break;
1540: }
1541: }
1.135 markus 1542: if (!found && !options.identities_only) {
1.150 djm 1543: id = xcalloc(1, sizeof(*id));
1.214 djm 1544: /* XXX "steals" key/comment from idlist */
1545: id->key = idlist->keys[j];
1546: id->filename = idlist->comments[j];
1547: idlist->keys[j] = NULL;
1548: idlist->comments[j] = NULL;
1549: id->agent_fd = agent_fd;
1.117 markus 1550: TAILQ_INSERT_TAIL(&agent, id, next);
1551: }
1552: }
1.214 djm 1553: ssh_free_identitylist(idlist);
1.117 markus 1554: /* append remaining agent keys */
1555: for (id = TAILQ_FIRST(&agent); id; id = TAILQ_FIRST(&agent)) {
1556: TAILQ_REMOVE(&agent, id, next);
1557: TAILQ_INSERT_TAIL(preferred, id, next);
1558: }
1.214 djm 1559: authctxt->agent_fd = agent_fd;
1.244 djm 1560: }
1561: /* Prefer PKCS11 keys that are explicitly listed */
1562: TAILQ_FOREACH_SAFE(id, &files, next, tmp) {
1563: if (id->key == NULL || (id->key->flags & SSHKEY_FLAG_EXT) == 0)
1564: continue;
1565: found = 0;
1566: TAILQ_FOREACH(id2, &files, next) {
1567: if (id2->key == NULL ||
1568: (id2->key->flags & SSHKEY_FLAG_EXT) == 0)
1569: continue;
1570: if (sshkey_equal(id->key, id2->key)) {
1571: TAILQ_REMOVE(&files, id, next);
1572: TAILQ_INSERT_TAIL(preferred, id, next);
1573: found = 1;
1574: break;
1575: }
1576: }
1577: /* If IdentitiesOnly set and key not found then don't use it */
1578: if (!found && options.identities_only) {
1579: TAILQ_REMOVE(&files, id, next);
1.278 markus 1580: freezero(id, sizeof(*id));
1.244 djm 1581: }
1.117 markus 1582: }
1583: /* append remaining keys from the config file */
1584: for (id = TAILQ_FIRST(&files); id; id = TAILQ_FIRST(&files)) {
1585: TAILQ_REMOVE(&files, id, next);
1586: TAILQ_INSERT_TAIL(preferred, id, next);
1587: }
1.228 djm 1588: /* finally, filter by PubkeyAcceptedKeyTypes */
1589: TAILQ_FOREACH_SAFE(id, preferred, next, id2) {
1.273 djm 1590: if (id->key != NULL && !key_type_allowed_by_config(id->key)) {
1.228 djm 1591: debug("Skipping %s key %s - "
1592: "not in PubkeyAcceptedKeyTypes",
1593: sshkey_ssh_name(id->key), id->filename);
1594: TAILQ_REMOVE(preferred, id, next);
1595: sshkey_free(id->key);
1596: free(id->filename);
1597: memset(id, 0, sizeof(*id));
1598: continue;
1599: }
1.117 markus 1600: }
1.287 djm 1601: /* List the keys we plan on using */
1602: TAILQ_FOREACH_SAFE(id, preferred, next, id2) {
1603: ident = format_identity(id);
1604: debug("Will attempt key: %s", ident);
1605: free(ident);
1606: }
1607: debug2("%s: done", __func__);
1.17 markus 1608: }
1609:
1.117 markus 1610: static void
1611: pubkey_cleanup(Authctxt *authctxt)
1.51 markus 1612: {
1.117 markus 1613: Identity *id;
1.51 markus 1614:
1.214 djm 1615: if (authctxt->agent_fd != -1)
1616: ssh_close_authentication_socket(authctxt->agent_fd);
1.117 markus 1617: for (id = TAILQ_FIRST(&authctxt->keys); id;
1618: id = TAILQ_FIRST(&authctxt->keys)) {
1619: TAILQ_REMOVE(&authctxt->keys, id, next);
1.235 mmcc 1620: sshkey_free(id->key);
1.197 djm 1621: free(id->filename);
1622: free(id);
1.117 markus 1623: }
1.1 markus 1624: }
1625:
1.251 djm 1626: static void
1627: pubkey_reset(Authctxt *authctxt)
1628: {
1629: Identity *id;
1630:
1631: TAILQ_FOREACH(id, &authctxt->keys, next)
1632: id->tried = 0;
1633: }
1634:
1.225 markus 1635: static int
1636: try_identity(Identity *id)
1637: {
1638: if (!id->key)
1639: return (0);
1.279 markus 1640: if (sshkey_type_plain(id->key->type) == KEY_RSA &&
1.225 markus 1641: (datafellows & SSH_BUG_RSASIGMD5) != 0) {
1642: debug("Skipped %s key %s for RSA/MD5 server",
1.279 markus 1643: sshkey_type(id->key), id->filename);
1.225 markus 1644: return (0);
1645: }
1.257 djm 1646: return 1;
1.225 markus 1647: }
1648:
1.20 markus 1649: int
1650: userauth_pubkey(Authctxt *authctxt)
1651: {
1.272 djm 1652: struct ssh *ssh = active_state; /* XXX */
1.117 markus 1653: Identity *id;
1.20 markus 1654: int sent = 0;
1.287 djm 1655: char *ident;
1.20 markus 1656:
1.117 markus 1657: while ((id = TAILQ_FIRST(&authctxt->keys))) {
1658: if (id->tried++)
1659: return (0);
1.127 markus 1660: /* move key to the end of the queue */
1.117 markus 1661: TAILQ_REMOVE(&authctxt->keys, id, next);
1662: TAILQ_INSERT_TAIL(&authctxt->keys, id, next);
1663: /*
1664: * send a test message if we have the public key. for
1665: * encrypted keys we cannot do this and have to load the
1666: * private key instead
1667: */
1.200 djm 1668: if (id->key != NULL) {
1.225 markus 1669: if (try_identity(id)) {
1.287 djm 1670: ident = format_identity(id);
1671: debug("Offering public key: %s", ident);
1672: free(ident);
1.272 djm 1673: sent = send_pubkey_test(ssh, authctxt, id);
1.200 djm 1674: }
1675: } else {
1.117 markus 1676: debug("Trying private key: %s", id->filename);
1.229 jcs 1677: id->key = load_identity_file(id);
1.117 markus 1678: if (id->key != NULL) {
1.225 markus 1679: if (try_identity(id)) {
1680: id->isprivate = 1;
1.272 djm 1681: sent = sign_and_send_pubkey(ssh,
1.200 djm 1682: authctxt, id);
1683: }
1.278 markus 1684: sshkey_free(id->key);
1.117 markus 1685: id->key = NULL;
1.251 djm 1686: id->isprivate = 0;
1.51 markus 1687: }
1688: }
1.117 markus 1689: if (sent)
1690: return (sent);
1.28 markus 1691: }
1.117 markus 1692: return (0);
1.20 markus 1693: }
1694:
1.23 markus 1695: /*
1696: * Send userauth request message specifying keyboard-interactive method.
1697: */
1698: int
1699: userauth_kbdint(Authctxt *authctxt)
1700: {
1.278 markus 1701: struct ssh *ssh = active_state; /* XXX */
1.23 markus 1702: static int attempt = 0;
1.278 markus 1703: int r;
1.23 markus 1704:
1705: if (attempt++ >= options.number_of_password_prompts)
1706: return 0;
1.82 markus 1707: /* disable if no SSH2_MSG_USERAUTH_INFO_REQUEST has been seen */
1708: if (attempt > 1 && !authctxt->info_req_seen) {
1709: debug3("userauth_kbdint: disable: no info_req_seen");
1.278 markus 1710: ssh_dispatch_set(ssh, SSH2_MSG_USERAUTH_INFO_REQUEST, NULL);
1.82 markus 1711: return 0;
1712: }
1.23 markus 1713:
1714: debug2("userauth_kbdint");
1.278 markus 1715: if ((r = sshpkt_start(ssh, SSH2_MSG_USERAUTH_REQUEST)) != 0 ||
1716: (r = sshpkt_put_cstring(ssh, authctxt->server_user)) != 0 ||
1717: (r = sshpkt_put_cstring(ssh, authctxt->service)) != 0 ||
1718: (r = sshpkt_put_cstring(ssh, authctxt->method->name)) != 0 ||
1719: (r = sshpkt_put_cstring(ssh, "")) != 0 || /* lang */
1720: (r = sshpkt_put_cstring(ssh, options.kbd_interactive_devices ?
1721: options.kbd_interactive_devices : "")) != 0 ||
1722: (r = sshpkt_send(ssh)) != 0)
1723: fatal("%s: %s", __func__, ssh_err(r));
1.23 markus 1724:
1.278 markus 1725: ssh_dispatch_set(ssh, SSH2_MSG_USERAUTH_INFO_REQUEST, &input_userauth_info_req);
1.23 markus 1726: return 1;
1727: }
1728:
1729: /*
1.46 markus 1730: * parse INFO_REQUEST, prompt user and send INFO_RESPONSE
1.23 markus 1731: */
1.218 markus 1732: int
1.261 markus 1733: input_userauth_info_req(int type, u_int32_t seq, struct ssh *ssh)
1.23 markus 1734: {
1.260 markus 1735: Authctxt *authctxt = ssh->authctxt;
1.278 markus 1736: char *name = NULL, *inst = NULL, *lang = NULL, *prompt = NULL;
1737: char *response = NULL;
1738: u_char echo = 0;
1.32 markus 1739: u_int num_prompts, i;
1.278 markus 1740: int r;
1.23 markus 1741:
1742: debug2("input_userauth_info_req");
1743:
1744: if (authctxt == NULL)
1745: fatal("input_userauth_info_req: no authentication context");
1.82 markus 1746:
1747: authctxt->info_req_seen = 1;
1.23 markus 1748:
1.278 markus 1749: if ((r = sshpkt_get_cstring(ssh, &name, NULL)) != 0 ||
1750: (r = sshpkt_get_cstring(ssh, &inst, NULL)) != 0 ||
1751: (r = sshpkt_get_cstring(ssh, &lang, NULL)) != 0)
1752: goto out;
1.23 markus 1753: if (strlen(name) > 0)
1.116 itojun 1754: logit("%s", name);
1.23 markus 1755: if (strlen(inst) > 0)
1.116 itojun 1756: logit("%s", inst);
1.23 markus 1757:
1.278 markus 1758: if ((r = sshpkt_get_u32(ssh, &num_prompts)) != 0)
1759: goto out;
1.23 markus 1760: /*
1761: * Begin to build info response packet based on prompts requested.
1762: * We commit to providing the correct number of responses, so if
1763: * further on we run into a problem that prevents this, we have to
1764: * be sure and clean this up and send a correct error response.
1765: */
1.278 markus 1766: if ((r = sshpkt_start(ssh, SSH2_MSG_USERAUTH_INFO_RESPONSE)) != 0 ||
1767: (r = sshpkt_put_u32(ssh, num_prompts)) != 0)
1768: goto out;
1.23 markus 1769:
1.73 markus 1770: debug2("input_userauth_info_req: num_prompts %d", num_prompts);
1.23 markus 1771: for (i = 0; i < num_prompts; i++) {
1.278 markus 1772: if ((r = sshpkt_get_cstring(ssh, &prompt, NULL)) != 0 ||
1773: (r = sshpkt_get_u8(ssh, &echo)) != 0)
1774: goto out;
1.77 markus 1775: response = read_passphrase(prompt, echo ? RP_ECHO : 0);
1.278 markus 1776: if ((r = sshpkt_put_cstring(ssh, response)) != 0)
1777: goto out;
1778: freezero(response, strlen(response));
1.197 djm 1779: free(prompt);
1.278 markus 1780: response = prompt = NULL;
1.23 markus 1781: }
1.278 markus 1782: /* done with parsing incoming message. */
1783: if ((r = sshpkt_get_end(ssh)) != 0 ||
1784: (r = sshpkt_add_padding(ssh, 64)) != 0)
1785: goto out;
1786: r = sshpkt_send(ssh);
1787: out:
1788: if (response)
1789: freezero(response, strlen(response));
1790: free(prompt);
1791: free(name);
1792: free(inst);
1793: free(lang);
1794: return r;
1.68 markus 1795: }
1796:
1.100 markus 1797: static int
1.223 djm 1798: ssh_keysign(struct sshkey *key, u_char **sigp, size_t *lenp,
1799: const u_char *data, size_t datalen)
1.100 markus 1800: {
1.223 djm 1801: struct sshbuf *b;
1.101 markus 1802: struct stat st;
1.100 markus 1803: pid_t pid;
1.223 djm 1804: int i, r, to[2], from[2], status, sock = packet_get_connection_in();
1805: u_char rversion = 0, version = 2;
1806: void (*osigchld)(int);
1.100 markus 1807:
1.223 djm 1808: *sigp = NULL;
1809: *lenp = 0;
1.100 markus 1810:
1.101 markus 1811: if (stat(_PATH_SSH_KEY_SIGN, &st) < 0) {
1.223 djm 1812: error("%s: not installed: %s", __func__, strerror(errno));
1813: return -1;
1814: }
1815: if (fflush(stdout) != 0) {
1816: error("%s: fflush: %s", __func__, strerror(errno));
1.101 markus 1817: return -1;
1818: }
1.100 markus 1819: if (pipe(to) < 0) {
1.223 djm 1820: error("%s: pipe: %s", __func__, strerror(errno));
1.100 markus 1821: return -1;
1822: }
1823: if (pipe(from) < 0) {
1.223 djm 1824: error("%s: pipe: %s", __func__, strerror(errno));
1.100 markus 1825: return -1;
1826: }
1827: if ((pid = fork()) < 0) {
1.223 djm 1828: error("%s: fork: %s", __func__, strerror(errno));
1.100 markus 1829: return -1;
1830: }
1.223 djm 1831: osigchld = signal(SIGCHLD, SIG_DFL);
1.100 markus 1832: if (pid == 0) {
1.174 dtucker 1833: /* keep the socket on exec */
1.223 djm 1834: fcntl(sock, F_SETFD, 0);
1.100 markus 1835: close(from[0]);
1836: if (dup2(from[1], STDOUT_FILENO) < 0)
1.223 djm 1837: fatal("%s: dup2: %s", __func__, strerror(errno));
1.100 markus 1838: close(to[1]);
1839: if (dup2(to[0], STDIN_FILENO) < 0)
1.223 djm 1840: fatal("%s: dup2: %s", __func__, strerror(errno));
1.103 markus 1841: close(from[1]);
1842: close(to[0]);
1.223 djm 1843: /* Close everything but stdio and the socket */
1844: for (i = STDERR_FILENO + 1; i < sock; i++)
1845: close(i);
1846: closefrom(sock + 1);
1847: debug3("%s: [child] pid=%ld, exec %s",
1848: __func__, (long)getpid(), _PATH_SSH_KEY_SIGN);
1.233 mmcc 1849: execl(_PATH_SSH_KEY_SIGN, _PATH_SSH_KEY_SIGN, (char *)NULL);
1.223 djm 1850: fatal("%s: exec(%s): %s", __func__, _PATH_SSH_KEY_SIGN,
1.100 markus 1851: strerror(errno));
1852: }
1853: close(from[1]);
1854: close(to[0]);
1855:
1.223 djm 1856: if ((b = sshbuf_new()) == NULL)
1857: fatal("%s: sshbuf_new failed", __func__);
1858: /* send # of sock, data to be signed */
1.253 djm 1859: if ((r = sshbuf_put_u32(b, sock)) != 0 ||
1.223 djm 1860: (r = sshbuf_put_string(b, data, datalen)) != 0)
1861: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1862: if (ssh_msg_send(to[1], version, b) == -1)
1863: fatal("%s: couldn't send request", __func__);
1864: sshbuf_reset(b);
1865: r = ssh_msg_recv(from[0], b);
1.101 markus 1866: close(from[0]);
1867: close(to[1]);
1.223 djm 1868: if (r < 0) {
1869: error("%s: no reply", __func__);
1870: goto fail;
1871: }
1.101 markus 1872:
1.223 djm 1873: errno = 0;
1874: while (waitpid(pid, &status, 0) < 0) {
1875: if (errno != EINTR) {
1876: error("%s: waitpid %ld: %s",
1877: __func__, (long)pid, strerror(errno));
1878: goto fail;
1879: }
1880: }
1881: if (!WIFEXITED(status)) {
1882: error("%s: exited abnormally", __func__);
1883: goto fail;
1884: }
1885: if (WEXITSTATUS(status) != 0) {
1886: error("%s: exited with status %d",
1887: __func__, WEXITSTATUS(status));
1888: goto fail;
1889: }
1890: if ((r = sshbuf_get_u8(b, &rversion)) != 0) {
1891: error("%s: buffer error: %s", __func__, ssh_err(r));
1892: goto fail;
1893: }
1894: if (rversion != version) {
1895: error("%s: bad version", __func__);
1896: goto fail;
1897: }
1898: if ((r = sshbuf_get_string(b, sigp, lenp)) != 0) {
1899: error("%s: buffer error: %s", __func__, ssh_err(r));
1900: fail:
1901: signal(SIGCHLD, osigchld);
1902: sshbuf_free(b);
1.100 markus 1903: return -1;
1904: }
1.223 djm 1905: signal(SIGCHLD, osigchld);
1906: sshbuf_free(b);
1.100 markus 1907:
1908: return 0;
1909: }
1910:
1.68 markus 1911: int
1912: userauth_hostbased(Authctxt *authctxt)
1913: {
1.272 djm 1914: struct ssh *ssh = active_state; /* XXX */
1.223 djm 1915: struct sshkey *private = NULL;
1916: struct sshbuf *b = NULL;
1917: u_char *sig = NULL, *keyblob = NULL;
1918: char *fp = NULL, *chost = NULL, *lname = NULL;
1919: size_t siglen = 0, keylen = 0;
1920: int i, r, success = 0;
1921:
1922: if (authctxt->ktypes == NULL) {
1923: authctxt->oktypes = xstrdup(options.hostbased_key_types);
1924: authctxt->ktypes = authctxt->oktypes;
1925: }
1.213 djm 1926:
1.223 djm 1927: /*
1928: * Work through each listed type pattern in HostbasedKeyTypes,
1929: * trying each hostkey that matches the type in turn.
1930: */
1931: for (;;) {
1932: if (authctxt->active_ktype == NULL)
1933: authctxt->active_ktype = strsep(&authctxt->ktypes, ",");
1934: if (authctxt->active_ktype == NULL ||
1935: *authctxt->active_ktype == '\0')
1936: break;
1937: debug3("%s: trying key type %s", __func__,
1938: authctxt->active_ktype);
1.68 markus 1939:
1.223 djm 1940: /* check for a useful key */
1941: private = NULL;
1942: for (i = 0; i < authctxt->sensitive->nkeys; i++) {
1943: if (authctxt->sensitive->keys[i] == NULL ||
1944: authctxt->sensitive->keys[i]->type == KEY_UNSPEC)
1945: continue;
1946: if (match_pattern_list(
1947: sshkey_ssh_name(authctxt->sensitive->keys[i]),
1.224 djm 1948: authctxt->active_ktype, 0) != 1)
1.223 djm 1949: continue;
1.68 markus 1950: /* we take and free the key */
1.223 djm 1951: private = authctxt->sensitive->keys[i];
1952: authctxt->sensitive->keys[i] = NULL;
1.68 markus 1953: break;
1954: }
1.223 djm 1955: /* Found one */
1956: if (private != NULL)
1957: break;
1958: /* No more keys of this type; advance */
1959: authctxt->active_ktype = NULL;
1.68 markus 1960: }
1.223 djm 1961: if (private == NULL) {
1962: free(authctxt->oktypes);
1963: authctxt->oktypes = authctxt->ktypes = NULL;
1964: authctxt->active_ktype = NULL;
1.109 markus 1965: debug("No more client hostkeys for hostbased authentication.");
1.223 djm 1966: goto out;
1.68 markus 1967: }
1.211 djm 1968:
1.223 djm 1969: if ((fp = sshkey_fingerprint(private, options.fingerprint_hash,
1970: SSH_FP_DEFAULT)) == NULL) {
1971: error("%s: sshkey_fingerprint failed", __func__);
1972: goto out;
1.68 markus 1973: }
1.223 djm 1974: debug("%s: trying hostkey %s %s",
1975: __func__, sshkey_ssh_name(private), fp);
1.211 djm 1976:
1.84 markus 1977: /* figure out a name for the client host */
1.223 djm 1978: if ((lname = get_local_name(packet_get_connection_in())) == NULL) {
1979: error("%s: cannot get local ipaddr/name", __func__);
1980: goto out;
1.84 markus 1981: }
1.223 djm 1982:
1983: /* XXX sshbuf_put_stringf? */
1984: xasprintf(&chost, "%s.", lname);
1985: debug2("%s: chost %s", __func__, chost);
1.84 markus 1986:
1.68 markus 1987: /* construct data */
1.223 djm 1988: if ((b = sshbuf_new()) == NULL) {
1989: error("%s: sshbuf_new failed", __func__);
1990: goto out;
1991: }
1992: if ((r = sshkey_to_blob(private, &keyblob, &keylen)) != 0) {
1993: error("%s: sshkey_to_blob: %s", __func__, ssh_err(r));
1994: goto out;
1995: }
1996: if ((r = sshbuf_put_string(b, session_id2, session_id2_len)) != 0 ||
1997: (r = sshbuf_put_u8(b, SSH2_MSG_USERAUTH_REQUEST)) != 0 ||
1998: (r = sshbuf_put_cstring(b, authctxt->server_user)) != 0 ||
1.267 djm 1999: (r = sshbuf_put_cstring(b, authctxt->service)) != 0 ||
1.223 djm 2000: (r = sshbuf_put_cstring(b, authctxt->method->name)) != 0 ||
1.279 markus 2001: (r = sshbuf_put_cstring(b, sshkey_ssh_name(private))) != 0 ||
1.223 djm 2002: (r = sshbuf_put_string(b, keyblob, keylen)) != 0 ||
2003: (r = sshbuf_put_cstring(b, chost)) != 0 ||
2004: (r = sshbuf_put_cstring(b, authctxt->local_user)) != 0) {
2005: error("%s: buffer error: %s", __func__, ssh_err(r));
2006: goto out;
2007: }
2008:
1.68 markus 2009: #ifdef DEBUG_PK
1.223 djm 2010: sshbuf_dump(b, stderr);
1.68 markus 2011: #endif
1.281 dtucker 2012: r = ssh_keysign(private, &sig, &siglen,
2013: sshbuf_ptr(b), sshbuf_len(b));
1.223 djm 2014: if (r != 0) {
2015: error("sign using hostkey %s %s failed",
2016: sshkey_ssh_name(private), fp);
2017: goto out;
2018: }
2019: if ((r = sshpkt_start(ssh, SSH2_MSG_USERAUTH_REQUEST)) != 0 ||
2020: (r = sshpkt_put_cstring(ssh, authctxt->server_user)) != 0 ||
2021: (r = sshpkt_put_cstring(ssh, authctxt->service)) != 0 ||
2022: (r = sshpkt_put_cstring(ssh, authctxt->method->name)) != 0 ||
1.279 markus 2023: (r = sshpkt_put_cstring(ssh, sshkey_ssh_name(private))) != 0 ||
1.223 djm 2024: (r = sshpkt_put_string(ssh, keyblob, keylen)) != 0 ||
2025: (r = sshpkt_put_cstring(ssh, chost)) != 0 ||
2026: (r = sshpkt_put_cstring(ssh, authctxt->local_user)) != 0 ||
2027: (r = sshpkt_put_string(ssh, sig, siglen)) != 0 ||
2028: (r = sshpkt_send(ssh)) != 0) {
2029: error("%s: packet error: %s", __func__, ssh_err(r));
2030: goto out;
2031: }
2032: success = 1;
2033:
2034: out:
1.278 markus 2035: if (sig != NULL)
2036: freezero(sig, siglen);
1.223 djm 2037: free(keyblob);
2038: free(lname);
2039: free(fp);
1.197 djm 2040: free(chost);
1.223 djm 2041: sshkey_free(private);
2042: sshbuf_free(b);
1.68 markus 2043:
1.223 djm 2044: return success;
1.23 markus 2045: }
1.170 djm 2046:
1.20 markus 2047: /* find auth method */
2048:
2049: /*
2050: * given auth method name, if configurable options permit this method fill
2051: * in auth_ident field and return true, otherwise return false.
2052: */
1.76 itojun 2053: static int
1.20 markus 2054: authmethod_is_enabled(Authmethod *method)
2055: {
2056: if (method == NULL)
2057: return 0;
2058: /* return false if options indicate this method is disabled */
2059: if (method->enabled == NULL || *method->enabled == 0)
2060: return 0;
2061: /* return false if batch mode is enabled but method needs interactive mode */
2062: if (method->batch_flag != NULL && *method->batch_flag != 0)
2063: return 0;
2064: return 1;
2065: }
2066:
1.76 itojun 2067: static Authmethod *
1.20 markus 2068: authmethod_lookup(const char *name)
1.1 markus 2069: {
1.20 markus 2070: Authmethod *method = NULL;
2071: if (name != NULL)
2072: for (method = authmethods; method->name != NULL; method++)
2073: if (strcmp(name, method->name) == 0)
2074: return method;
2075: debug2("Unrecognized authentication method name: %s", name ? name : "NULL");
2076: return NULL;
2077: }
1.1 markus 2078:
1.53 markus 2079: /* XXX internal state */
2080: static Authmethod *current = NULL;
2081: static char *supported = NULL;
2082: static char *preferred = NULL;
1.105 deraadt 2083:
1.20 markus 2084: /*
2085: * Given the authentication method list sent by the server, return the
2086: * next method we should try. If the server initially sends a nil list,
1.67 markus 2087: * use a built-in default list.
1.41 stevesk 2088: */
1.76 itojun 2089: static Authmethod *
1.20 markus 2090: authmethod_get(char *authlist)
2091: {
1.53 markus 2092: char *name = NULL;
1.97 markus 2093: u_int next;
1.41 stevesk 2094:
1.20 markus 2095: /* Use a suitable default if we're passed a nil list. */
2096: if (authlist == NULL || strlen(authlist) == 0)
1.53 markus 2097: authlist = options.preferred_authentications;
1.20 markus 2098:
1.53 markus 2099: if (supported == NULL || strcmp(authlist, supported) != 0) {
2100: debug3("start over, passed a different list %s", authlist);
1.197 djm 2101: free(supported);
1.53 markus 2102: supported = xstrdup(authlist);
2103: preferred = options.preferred_authentications;
2104: debug3("preferred %s", preferred);
2105: current = NULL;
2106: } else if (current != NULL && authmethod_is_enabled(current))
2107: return current;
1.20 markus 2108:
1.53 markus 2109: for (;;) {
2110: if ((name = match_list(preferred, supported, &next)) == NULL) {
1.109 markus 2111: debug("No more authentication methods to try.");
1.53 markus 2112: current = NULL;
2113: return NULL;
2114: }
2115: preferred += next;
1.23 markus 2116: debug3("authmethod_lookup %s", name);
1.53 markus 2117: debug3("remaining preferred: %s", preferred);
2118: if ((current = authmethod_lookup(name)) != NULL &&
2119: authmethod_is_enabled(current)) {
1.23 markus 2120: debug3("authmethod_is_enabled %s", name);
1.109 markus 2121: debug("Next authentication method: %s", name);
1.197 djm 2122: free(name);
1.53 markus 2123: return current;
1.23 markus 2124: }
1.198 dtucker 2125: free(name);
1.1 markus 2126: }
1.53 markus 2127: }
1.1 markus 2128:
1.79 stevesk 2129: static char *
1.53 markus 2130: authmethods_get(void)
2131: {
2132: Authmethod *method = NULL;
1.278 markus 2133: struct sshbuf *b;
1.93 markus 2134: char *list;
1.278 markus 2135: int r;
1.27 provos 2136:
1.278 markus 2137: if ((b = sshbuf_new()) == NULL)
2138: fatal("%s: sshbuf_new failed", __func__);
1.53 markus 2139: for (method = authmethods; method->name != NULL; method++) {
2140: if (authmethod_is_enabled(method)) {
1.278 markus 2141: if ((r = sshbuf_putf(b, "%s%s",
2142: sshbuf_len(b) ? "," : "", method->name)) != 0)
2143: fatal("%s: buffer error: %s",
2144: __func__, ssh_err(r));
1.53 markus 2145: }
2146: }
1.278 markus 2147: if ((list = sshbuf_dup_string(b)) == NULL)
1.242 djm 2148: fatal("%s: sshbuf_dup_string failed", __func__);
1.278 markus 2149: sshbuf_free(b);
1.93 markus 2150: return list;
1.1 markus 2151: }
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