Annotation of src/usr.bin/ssh/sshconnect2.c, Revision 1.293
1.293 ! djm 1: /* $OpenBSD: sshconnect2.c,v 1.292 2019/01/04 03:27:50 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:
! 74: #include "opacket.h" /* XXX */
! 75: extern struct ssh *active_state; /* XXX */
1.121 markus 76:
1.1 markus 77: /* import */
78: extern char *client_version_string;
79: extern char *server_version_string;
80: extern Options options;
81:
82: /*
83: * SSH2 key exchange
84: */
85:
1.32 markus 86: u_char *session_id2 = NULL;
1.120 markus 87: u_int session_id2_len = 0;
1.1 markus 88:
1.61 markus 89: char *xxx_host;
90: struct sockaddr *xxx_hostaddr;
91:
1.76 itojun 92: static int
1.259 markus 93: verify_host_key_callback(struct sshkey *hostkey, struct ssh *ssh)
1.61 markus 94: {
1.75 markus 95: if (verify_host_key(xxx_host, xxx_hostaddr, hostkey) == -1)
1.83 markus 96: fatal("Host key verification failed.");
1.61 markus 97: return 0;
98: }
99:
1.186 djm 100: static char *
101: order_hostkeyalgs(char *host, struct sockaddr *hostaddr, u_short port)
102: {
103: char *oavail, *avail, *first, *last, *alg, *hostname, *ret;
104: size_t maxlen;
105: struct hostkeys *hostkeys;
106: int ktype;
1.188 djm 107: u_int i;
1.186 djm 108:
109: /* Find all hostkeys for this hostname */
110: get_hostfile_hostname_ipaddr(host, hostaddr, port, &hostname, NULL);
111: hostkeys = init_hostkeys();
1.188 djm 112: for (i = 0; i < options.num_user_hostfiles; i++)
113: load_hostkeys(hostkeys, hostname, options.user_hostfiles[i]);
114: for (i = 0; i < options.num_system_hostfiles; i++)
115: load_hostkeys(hostkeys, hostname, options.system_hostfiles[i]);
1.186 djm 116:
117: oavail = avail = xstrdup(KEX_DEFAULT_PK_ALG);
118: maxlen = strlen(avail) + 1;
119: first = xmalloc(maxlen);
120: last = xmalloc(maxlen);
121: *first = *last = '\0';
122:
123: #define ALG_APPEND(to, from) \
124: do { \
125: if (*to != '\0') \
126: strlcat(to, ",", maxlen); \
127: strlcat(to, from, maxlen); \
128: } while (0)
129:
130: while ((alg = strsep(&avail, ",")) && *alg != '\0') {
1.214 djm 131: if ((ktype = sshkey_type_from_name(alg)) == KEY_UNSPEC)
1.186 djm 132: fatal("%s: unknown alg %s", __func__, alg);
133: if (lookup_key_in_hostkeys_by_type(hostkeys,
1.214 djm 134: sshkey_type_plain(ktype), NULL))
1.186 djm 135: ALG_APPEND(first, alg);
136: else
137: ALG_APPEND(last, alg);
138: }
139: #undef ALG_APPEND
1.216 djm 140: xasprintf(&ret, "%s%s%s", first,
141: (*first == '\0' || *last == '\0') ? "" : ",", last);
1.186 djm 142: if (*first != '\0')
143: debug3("%s: prefer hostkeyalgs: %s", __func__, first);
144:
1.197 djm 145: free(first);
146: free(last);
147: free(hostname);
148: free(oavail);
1.186 djm 149: free_hostkeys(hostkeys);
150:
151: return ret;
152: }
153:
1.1 markus 154: void
1.291 djm 155: ssh_kex2(struct ssh *ssh, char *host, struct sockaddr *hostaddr, u_short port)
1.22 provos 156: {
1.205 markus 157: char *myproposal[PROPOSAL_MAX] = { KEX_CLIENT };
1.275 djm 158: char *s, *all_key;
1.221 markus 159: int r;
1.61 markus 160:
161: xxx_host = host;
162: xxx_hostaddr = hostaddr;
1.22 provos 163:
1.231 markus 164: if ((s = kex_names_cat(options.kex_algorithms, "ext-info-c")) == NULL)
165: fatal("%s: kex_names_cat", __func__);
1.284 djm 166: myproposal[PROPOSAL_KEX_ALGS] = compat_kex_proposal(s);
1.60 stevesk 167: myproposal[PROPOSAL_ENC_ALGS_CTOS] =
1.284 djm 168: compat_cipher_proposal(options.ciphers);
1.60 stevesk 169: myproposal[PROPOSAL_ENC_ALGS_STOC] =
1.284 djm 170: compat_cipher_proposal(options.ciphers);
1.245 dtucker 171: myproposal[PROPOSAL_COMP_ALGS_CTOS] =
172: myproposal[PROPOSAL_COMP_ALGS_STOC] = options.compression ?
1.277 sf 173: "zlib@openssh.com,zlib,none" : "none,zlib@openssh.com,zlib";
1.226 djm 174: myproposal[PROPOSAL_MAC_ALGS_CTOS] =
175: myproposal[PROPOSAL_MAC_ALGS_STOC] = options.macs;
176: if (options.hostkeyalgorithms != NULL) {
1.275 djm 177: all_key = sshkey_alg_list(0, 0, 1, ',');
178: if (kex_assemble_names(&options.hostkeyalgorithms,
179: KEX_DEFAULT_PK_ALG, all_key) != 0)
1.226 djm 180: fatal("%s: kex_assemble_namelist", __func__);
1.275 djm 181: free(all_key);
1.88 deraadt 182: myproposal[PROPOSAL_SERVER_HOST_KEY_ALGS] =
1.284 djm 183: compat_pkalg_proposal(options.hostkeyalgorithms);
1.226 djm 184: } else {
1.225 markus 185: /* Enforce default */
186: options.hostkeyalgorithms = xstrdup(KEX_DEFAULT_PK_ALG);
1.186 djm 187: /* Prefer algorithms that we already have keys for */
188: myproposal[PROPOSAL_SERVER_HOST_KEY_ALGS] =
1.200 djm 189: compat_pkalg_proposal(
1.284 djm 190: order_hostkeyalgs(host, hostaddr, port));
1.186 djm 191: }
1.115 markus 192:
1.196 dtucker 193: if (options.rekey_limit || options.rekey_interval)
1.254 dtucker 194: packet_set_rekey_limits(options.rekey_limit,
195: options.rekey_interval);
1.22 provos 196:
1.65 markus 197: /* start key exchange */
1.291 djm 198: if ((r = kex_setup(ssh, myproposal)) != 0)
1.221 markus 199: fatal("kex_setup: %s", ssh_err(r));
1.207 markus 200: #ifdef WITH_OPENSSL
1.291 djm 201: ssh->kex->kex[KEX_DH_GRP1_SHA1] = kexdh_client;
202: ssh->kex->kex[KEX_DH_GRP14_SHA1] = kexdh_client;
203: ssh->kex->kex[KEX_DH_GRP14_SHA256] = kexdh_client;
204: ssh->kex->kex[KEX_DH_GRP16_SHA512] = kexdh_client;
205: ssh->kex->kex[KEX_DH_GRP18_SHA512] = kexdh_client;
206: ssh->kex->kex[KEX_DH_GEX_SHA1] = kexgex_client;
207: ssh->kex->kex[KEX_DH_GEX_SHA256] = kexgex_client;
208: ssh->kex->kex[KEX_ECDH_SHA2] = kexecdh_client;
1.207 markus 209: #endif
1.291 djm 210: ssh->kex->kex[KEX_C25519_SHA256] = kexc25519_client;
211: ssh->kex->verify_host_key=&verify_host_key_callback;
1.22 provos 212:
1.291 djm 213: ssh_dispatch_run_fatal(ssh, DISPATCH_BLOCK, &ssh->kex->done);
1.173 andreas 214:
1.231 markus 215: /* remove ext-info from the KEX proposals for rekeying */
216: myproposal[PROPOSAL_KEX_ALGS] =
1.284 djm 217: compat_kex_proposal(options.kex_algorithms);
1.291 djm 218: if ((r = kex_prop2buf(ssh->kex->my, myproposal)) != 0)
1.231 markus 219: fatal("kex_prop2buf: %s", ssh_err(r));
1.62 markus 220:
1.291 djm 221: session_id2 = ssh->kex->session_id;
222: session_id2_len = ssh->kex->session_id_len;
1.22 provos 223:
224: #ifdef DEBUG_KEXDH
225: /* send 1st encrypted/maced/compressed message */
1.278 markus 226: if ((r = sshpkt_start(ssh, SSH2_MSG_IGNORE)) != 0 ||
227: (r = sshpkt_put_cstring(ssh, "markus")) != 0 ||
1.280 markus 228: (r = sshpkt_send(ssh)) != 0 ||
229: (r = ssh_packet_write_wait(ssh)) != 0)
1.278 markus 230: fatal("%s: %s", __func__, ssh_err(r));
1.22 provos 231: #endif
1.1 markus 232: }
1.11 markus 233:
1.1 markus 234: /*
235: * Authenticate user
236: */
1.20 markus 237:
1.214 djm 238: typedef struct cauthctxt Authctxt;
239: typedef struct cauthmethod Authmethod;
1.117 markus 240: typedef struct identity Identity;
241: typedef struct idlist Idlist;
1.20 markus 242:
1.117 markus 243: struct identity {
244: TAILQ_ENTRY(identity) next;
1.214 djm 245: int agent_fd; /* >=0 if agent supports key */
246: struct sshkey *key; /* public/private key */
1.117 markus 247: char *filename; /* comment for agent-only keys */
248: int tried;
249: int isprivate; /* key points to the private key */
1.191 dtucker 250: int userprovided;
1.117 markus 251: };
252: TAILQ_HEAD(idlist, identity);
1.20 markus 253:
1.214 djm 254: struct cauthctxt {
1.20 markus 255: const char *server_user;
1.68 markus 256: const char *local_user;
1.20 markus 257: const char *host;
258: const char *service;
1.214 djm 259: struct cauthmethod *method;
1.183 djm 260: sig_atomic_t success;
1.51 markus 261: char *authlist;
1.68 markus 262: /* pubkey */
1.214 djm 263: struct idlist keys;
264: int agent_fd;
1.68 markus 265: /* hostbased */
1.100 markus 266: Sensitive *sensitive;
1.223 djm 267: char *oktypes, *ktypes;
268: const char *active_ktype;
1.82 markus 269: /* kbd-interactive */
270: int info_req_seen;
1.292 djm 271: int attempt_kbdint;
272: /* password */
273: int attempt_passwd;
1.121 markus 274: /* generic */
275: void *methoddata;
1.20 markus 276: };
1.214 djm 277:
278: struct cauthmethod {
1.20 markus 279: char *name; /* string to compare against server's list */
280: int (*userauth)(Authctxt *authctxt);
1.170 djm 281: void (*cleanup)(Authctxt *authctxt);
1.20 markus 282: int *enabled; /* flag in option struct that enables method */
283: int *batch_flag; /* flag in option struct that disables method */
284: };
285:
1.261 markus 286: int input_userauth_service_accept(int, u_int32_t, struct ssh *);
287: int input_userauth_ext_info(int, u_int32_t, struct ssh *);
288: int input_userauth_success(int, u_int32_t, struct ssh *);
289: int input_userauth_success_unexpected(int, u_int32_t, struct ssh *);
290: int input_userauth_failure(int, u_int32_t, struct ssh *);
291: int input_userauth_banner(int, u_int32_t, struct ssh *);
292: int input_userauth_error(int, u_int32_t, struct ssh *);
293: int input_userauth_info_req(int, u_int32_t, struct ssh *);
294: int input_userauth_pk_ok(int, u_int32_t, struct ssh *);
295: int input_userauth_passwd_changereq(int, u_int32_t, struct ssh *);
1.86 itojun 296:
297: int userauth_none(Authctxt *);
298: int userauth_pubkey(Authctxt *);
299: int userauth_passwd(Authctxt *);
300: int userauth_kbdint(Authctxt *);
301: int userauth_hostbased(Authctxt *);
1.20 markus 302:
1.121 markus 303: #ifdef GSSAPI
304: int userauth_gssapi(Authctxt *authctxt);
1.261 markus 305: int input_gssapi_response(int type, u_int32_t, struct ssh *);
306: int input_gssapi_token(int type, u_int32_t, struct ssh *);
307: int input_gssapi_hash(int type, u_int32_t, struct ssh *);
308: int input_gssapi_error(int, u_int32_t, struct ssh *);
309: int input_gssapi_errtok(int, u_int32_t, struct ssh *);
1.121 markus 310: #endif
311:
1.86 itojun 312: void userauth(Authctxt *, char *);
1.51 markus 313:
1.272 djm 314: static int sign_and_send_pubkey(struct ssh *ssh, Authctxt *, Identity *);
1.117 markus 315: static void pubkey_prepare(Authctxt *);
316: static void pubkey_cleanup(Authctxt *);
1.251 djm 317: static void pubkey_reset(Authctxt *);
1.259 markus 318: static struct sshkey *load_identity_file(Identity *);
1.76 itojun 319:
320: static Authmethod *authmethod_get(char *authlist);
321: static Authmethod *authmethod_lookup(const char *name);
322: static char *authmethods_get(void);
1.20 markus 323:
324: Authmethod authmethods[] = {
1.121 markus 325: #ifdef GSSAPI
1.132 markus 326: {"gssapi-with-mic",
1.121 markus 327: userauth_gssapi,
1.170 djm 328: NULL,
1.121 markus 329: &options.gss_authentication,
330: NULL},
331: #endif
1.81 markus 332: {"hostbased",
333: userauth_hostbased,
1.170 djm 334: NULL,
1.81 markus 335: &options.hostbased_authentication,
336: NULL},
1.20 markus 337: {"publickey",
338: userauth_pubkey,
1.170 djm 339: NULL,
1.28 markus 340: &options.pubkey_authentication,
1.20 markus 341: NULL},
1.81 markus 342: {"keyboard-interactive",
343: userauth_kbdint,
1.170 djm 344: NULL,
1.81 markus 345: &options.kbd_interactive_authentication,
346: &options.batch_mode},
1.20 markus 347: {"password",
348: userauth_passwd,
1.170 djm 349: NULL,
1.20 markus 350: &options.password_authentication,
1.23 markus 351: &options.batch_mode},
352: {"none",
353: userauth_none,
354: NULL,
1.170 djm 355: NULL,
1.23 markus 356: NULL},
1.170 djm 357: {NULL, NULL, NULL, NULL, NULL}
1.20 markus 358: };
359:
360: void
1.291 djm 361: ssh_userauth2(struct ssh *ssh, const char *local_user,
362: const char *server_user, char *host, Sensitive *sensitive)
1.20 markus 363: {
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));
1.20 markus 374: authctxt.server_user = server_user;
1.68 markus 375: authctxt.local_user = local_user;
1.20 markus 376: authctxt.host = host;
377: authctxt.service = "ssh-connection"; /* service name */
378: authctxt.success = 0;
1.23 markus 379: authctxt.method = authmethod_lookup("none");
1.51 markus 380: authctxt.authlist = NULL;
1.121 markus 381: authctxt.methoddata = NULL;
1.100 markus 382: authctxt.sensitive = sensitive;
1.223 djm 383: authctxt.active_ktype = authctxt.oktypes = authctxt.ktypes = NULL;
1.82 markus 384: authctxt.info_req_seen = 0;
1.292 djm 385: authctxt.attempt_kbdint = 0;
386: authctxt.attempt_passwd = 0;
1.215 djm 387: authctxt.agent_fd = -1;
1.289 djm 388: pubkey_prepare(&authctxt);
1.291 djm 389: if (authctxt.method == NULL) {
390: fatal("%s: internal error: cannot send userauth none request",
391: __func__);
392: }
1.20 markus 393:
1.231 markus 394: if ((r = sshpkt_start(ssh, SSH2_MSG_SERVICE_REQUEST)) != 0 ||
395: (r = sshpkt_put_cstring(ssh, "ssh-userauth")) != 0 ||
396: (r = sshpkt_send(ssh)) != 0)
397: fatal("%s: %s", __func__, ssh_err(r));
398:
1.260 markus 399: ssh->authctxt = &authctxt;
1.231 markus 400: ssh_dispatch_init(ssh, &input_userauth_error);
401: ssh_dispatch_set(ssh, SSH2_MSG_EXT_INFO, &input_userauth_ext_info);
402: ssh_dispatch_set(ssh, SSH2_MSG_SERVICE_ACCEPT, &input_userauth_service_accept);
1.263 markus 403: ssh_dispatch_run_fatal(ssh, DISPATCH_BLOCK, &authctxt.success); /* loop until success */
1.260 markus 404: ssh->authctxt = NULL;
1.20 markus 405:
1.117 markus 406: pubkey_cleanup(&authctxt);
1.231 markus 407: ssh_dispatch_range(ssh, SSH2_MSG_USERAUTH_MIN, SSH2_MSG_USERAUTH_MAX, NULL);
1.119 markus 408:
1.248 dtucker 409: if (!authctxt.success)
410: fatal("Authentication failed.");
1.109 markus 411: debug("Authentication succeeded (%s).", authctxt.method->name);
1.20 markus 412: }
1.119 markus 413:
1.231 markus 414: /* ARGSUSED */
415: int
1.261 markus 416: input_userauth_service_accept(int type, u_int32_t seq, struct ssh *ssh)
1.231 markus 417: {
1.260 markus 418: Authctxt *authctxt = ssh->authctxt;
1.231 markus 419: int r;
420:
421: if (ssh_packet_remaining(ssh) > 0) {
422: char *reply;
423:
424: if ((r = sshpkt_get_cstring(ssh, &reply, NULL)) != 0)
425: goto out;
426: debug2("service_accept: %s", reply);
427: free(reply);
428: } else {
429: debug2("buggy server: service_accept w/o service");
430: }
431: if ((r = sshpkt_get_end(ssh)) != 0)
432: goto out;
433: debug("SSH2_MSG_SERVICE_ACCEPT received");
434:
435: /* initial userauth request */
436: userauth_none(authctxt);
437:
438: ssh_dispatch_set(ssh, SSH2_MSG_EXT_INFO, &input_userauth_error);
439: ssh_dispatch_set(ssh, SSH2_MSG_USERAUTH_SUCCESS, &input_userauth_success);
440: ssh_dispatch_set(ssh, SSH2_MSG_USERAUTH_FAILURE, &input_userauth_failure);
441: ssh_dispatch_set(ssh, SSH2_MSG_USERAUTH_BANNER, &input_userauth_banner);
442: r = 0;
443: out:
444: return r;
445: }
446:
447: /* ARGSUSED */
448: int
1.261 markus 449: input_userauth_ext_info(int type, u_int32_t seqnr, struct ssh *ssh)
1.231 markus 450: {
1.261 markus 451: return kex_input_ext_info(type, seqnr, ssh);
1.231 markus 452: }
453:
1.20 markus 454: void
1.51 markus 455: userauth(Authctxt *authctxt, char *authlist)
456: {
1.278 markus 457: struct ssh *ssh = active_state; /* XXX */
458:
1.170 djm 459: if (authctxt->method != NULL && authctxt->method->cleanup != NULL)
460: authctxt->method->cleanup(authctxt);
461:
1.197 djm 462: free(authctxt->methoddata);
463: authctxt->methoddata = NULL;
1.51 markus 464: if (authlist == NULL) {
465: authlist = authctxt->authlist;
466: } else {
1.197 djm 467: free(authctxt->authlist);
1.51 markus 468: authctxt->authlist = authlist;
469: }
470: for (;;) {
471: Authmethod *method = authmethod_get(authlist);
472: if (method == NULL)
1.264 dtucker 473: fatal("%s@%s: Permission denied (%s).",
474: authctxt->server_user, authctxt->host, authlist);
1.51 markus 475: authctxt->method = method;
1.119 markus 476:
477: /* reset the per method handler */
1.278 markus 478: ssh_dispatch_range(ssh, SSH2_MSG_USERAUTH_PER_METHOD_MIN,
1.119 markus 479: SSH2_MSG_USERAUTH_PER_METHOD_MAX, NULL);
480:
481: /* and try new method */
1.51 markus 482: if (method->userauth(authctxt) != 0) {
483: debug2("we sent a %s packet, wait for reply", method->name);
484: break;
485: } else {
486: debug2("we did not send a packet, disable method");
487: method->enabled = NULL;
488: }
489: }
490: }
1.105 deraadt 491:
1.169 djm 492: /* ARGSUSED */
1.218 markus 493: int
1.261 markus 494: input_userauth_error(int type, u_int32_t seq, struct ssh *ssh)
1.20 markus 495: {
1.35 markus 496: fatal("input_userauth_error: bad message during authentication: "
1.140 djm 497: "type %d", type);
1.218 markus 498: return 0;
1.35 markus 499: }
1.105 deraadt 500:
1.169 djm 501: /* ARGSUSED */
1.218 markus 502: int
1.261 markus 503: input_userauth_banner(int type, u_int32_t seq, struct ssh *ssh)
1.35 markus 504: {
1.246 djm 505: char *msg, *lang;
1.166 djm 506: u_int len;
1.126 deraadt 507:
1.246 djm 508: debug3("%s", __func__);
509: msg = packet_get_string(&len);
1.35 markus 510: lang = packet_get_string(NULL);
1.246 djm 511: if (len > 0 && options.log_level >= SYSLOG_LEVEL_INFO)
512: fmprintf(stderr, "%s", msg);
513: free(msg);
1.197 djm 514: free(lang);
1.218 markus 515: return 0;
1.20 markus 516: }
1.105 deraadt 517:
1.169 djm 518: /* ARGSUSED */
1.218 markus 519: int
1.261 markus 520: input_userauth_success(int type, u_int32_t seq, struct ssh *ssh)
1.20 markus 521: {
1.260 markus 522: Authctxt *authctxt = ssh->authctxt;
1.172 djm 523:
1.20 markus 524: if (authctxt == NULL)
525: fatal("input_userauth_success: no authentication context");
1.197 djm 526: free(authctxt->authlist);
527: authctxt->authlist = NULL;
1.172 djm 528: if (authctxt->method != NULL && authctxt->method->cleanup != NULL)
529: authctxt->method->cleanup(authctxt);
1.197 djm 530: free(authctxt->methoddata);
531: authctxt->methoddata = NULL;
1.20 markus 532: authctxt->success = 1; /* break out */
1.218 markus 533: return 0;
1.20 markus 534: }
1.105 deraadt 535:
1.218 markus 536: int
1.261 markus 537: input_userauth_success_unexpected(int type, u_int32_t seq, struct ssh *ssh)
1.172 djm 538: {
1.260 markus 539: Authctxt *authctxt = ssh->authctxt;
1.172 djm 540:
541: if (authctxt == NULL)
542: fatal("%s: no authentication context", __func__);
543:
544: fatal("Unexpected authentication success during %s.",
545: authctxt->method->name);
1.218 markus 546: return 0;
1.172 djm 547: }
548:
1.169 djm 549: /* ARGSUSED */
1.218 markus 550: int
1.261 markus 551: input_userauth_failure(int type, u_int32_t seq, struct ssh *ssh)
1.20 markus 552: {
1.260 markus 553: Authctxt *authctxt = ssh->authctxt;
1.20 markus 554: char *authlist = NULL;
1.278 markus 555: u_char partial;
556: int r;
1.20 markus 557:
558: if (authctxt == NULL)
559: fatal("input_userauth_failure: no authentication context");
560:
1.278 markus 561: if ((r = sshpkt_get_cstring(ssh, &authlist, NULL)) != 0 ||
562: (r = sshpkt_get_u8(ssh, &partial)) != 0 ||
563: (r = sshpkt_get_end(ssh)) != 0)
564: goto out;
1.20 markus 565:
1.193 markus 566: if (partial != 0) {
1.247 dtucker 567: verbose("Authenticated with partial success.");
1.193 markus 568: /* reset state */
1.251 djm 569: pubkey_reset(authctxt);
1.193 markus 570: }
1.109 markus 571: debug("Authentications that can continue: %s", authlist);
1.20 markus 572:
1.51 markus 573: userauth(authctxt, authlist);
1.278 markus 574: authlist = NULL;
575: out:
576: free(authlist);
1.218 markus 577: return 0;
1.51 markus 578: }
1.169 djm 579:
1.287 djm 580: /*
581: * Format an identity for logging including filename, key type, fingerprint
582: * and location (agent, etc.). Caller must free.
583: */
584: static char *
585: format_identity(Identity *id)
586: {
587: char *fp = NULL, *ret = NULL;
588:
589: if (id->key != NULL) {
590: fp = sshkey_fingerprint(id->key, options.fingerprint_hash,
591: SSH_FP_DEFAULT);
592: }
593: xasprintf(&ret, "%s %s%s%s%s%s%s",
594: id->filename,
595: id->key ? sshkey_type(id->key) : "", id->key ? " " : "",
596: fp ? fp : "",
597: id->userprovided ? " explicit" : "",
598: (id->key && (id->key->flags & SSHKEY_FLAG_EXT)) ? " token" : "",
599: id->agent_fd != -1 ? " agent" : "");
600: free(fp);
601: return ret;
602: }
603:
1.169 djm 604: /* ARGSUSED */
1.218 markus 605: int
1.261 markus 606: input_userauth_pk_ok(int type, u_int32_t seq, struct ssh *ssh)
1.51 markus 607: {
1.260 markus 608: Authctxt *authctxt = ssh->authctxt;
1.259 markus 609: struct sshkey *key = NULL;
1.117 markus 610: Identity *id = NULL;
1.287 djm 611: int pktype, found = 0, sent = 0;
1.278 markus 612: size_t blen;
1.287 djm 613: char *pkalg = NULL, *fp = NULL, *ident = NULL;
1.278 markus 614: u_char *pkblob = NULL;
615: int r;
1.51 markus 616:
617: if (authctxt == NULL)
618: fatal("input_userauth_pk_ok: no authentication context");
1.267 djm 619:
1.278 markus 620: if ((r = sshpkt_get_cstring(ssh, &pkalg, NULL)) != 0 ||
621: (r = sshpkt_get_string(ssh, &pkblob, &blen)) != 0 ||
622: (r = sshpkt_get_end(ssh)) != 0)
623: goto done;
1.51 markus 624:
1.278 markus 625: if ((pktype = sshkey_type_from_name(pkalg)) == KEY_UNSPEC) {
1.287 djm 626: debug("%s: server sent unknown pkalg %s", __func__, pkalg);
1.117 markus 627: goto done;
628: }
1.278 markus 629: if ((r = sshkey_from_blob(pkblob, blen, &key)) != 0) {
630: debug("no key from blob. pkalg %s: %s", pkalg, ssh_err(r));
1.117 markus 631: goto done;
632: }
633: if (key->type != pktype) {
634: error("input_userauth_pk_ok: type mismatch "
635: "for decoded key (received %d, expected %d)",
636: key->type, pktype);
637: goto done;
638: }
639:
1.127 markus 640: /*
641: * search keys in the reverse order, because last candidate has been
642: * moved to the end of the queue. this also avoids confusion by
643: * duplicate keys
644: */
1.136 henning 645: TAILQ_FOREACH_REVERSE(id, &authctxt->keys, idlist, next) {
1.278 markus 646: if (sshkey_equal(key, id->key)) {
1.287 djm 647: found = 1;
1.51 markus 648: break;
649: }
1.117 markus 650: }
1.287 djm 651: if (!found || id == NULL) {
652: fp = sshkey_fingerprint(key, options.fingerprint_hash,
653: SSH_FP_DEFAULT);
654: error("%s: server replied with unknown key: %s %s", __func__,
655: sshkey_type(key), fp == NULL ? "<ERROR>" : fp);
656: goto done;
657: }
658: ident = format_identity(id);
659: debug("Server accepts key: %s", ident);
660: sent = sign_and_send_pubkey(ssh, authctxt, id);
1.278 markus 661: r = 0;
662: done:
663: sshkey_free(key);
1.287 djm 664: free(ident);
665: free(fp);
1.197 djm 666: free(pkalg);
667: free(pkblob);
1.51 markus 668:
1.106 deraadt 669: /* try another method if we did not send a packet */
1.278 markus 670: if (r == 0 && sent == 0)
1.51 markus 671: userauth(authctxt, NULL);
1.278 markus 672: return r;
1.20 markus 673: }
1.121 markus 674:
675: #ifdef GSSAPI
1.133 djm 676: int
1.121 markus 677: userauth_gssapi(Authctxt *authctxt)
678: {
1.278 markus 679: struct ssh *ssh = active_state; /* XXX */
1.121 markus 680: Gssctxt *gssctxt = NULL;
1.128 avsm 681: static gss_OID_set gss_supported = NULL;
1.139 djm 682: static u_int mech = 0;
1.121 markus 683: OM_uint32 min;
1.278 markus 684: int r, ok = 0;
1.121 markus 685:
686: /* Try one GSSAPI method at a time, rather than sending them all at
687: * once. */
688:
1.128 avsm 689: if (gss_supported == NULL)
690: gss_indicate_mechs(&min, &gss_supported);
1.121 markus 691:
692: /* Check to see if the mechanism is usable before we offer it */
1.128 avsm 693: while (mech < gss_supported->count && !ok) {
1.121 markus 694: /* My DER encoding requires length<128 */
1.128 avsm 695: if (gss_supported->elements[mech].length < 128 &&
1.271 djm 696: ssh_gssapi_check_mechanism(&gssctxt,
1.161 djm 697: &gss_supported->elements[mech], authctxt->host)) {
1.121 markus 698: ok = 1; /* Mechanism works */
699: } else {
700: mech++;
701: }
702: }
703:
1.161 djm 704: if (!ok)
1.139 djm 705: return 0;
1.121 markus 706:
707: authctxt->methoddata=(void *)gssctxt;
708:
1.278 markus 709: if ((r = sshpkt_start(ssh, SSH2_MSG_USERAUTH_REQUEST)) != 0 ||
710: (r = sshpkt_put_cstring(ssh, authctxt->server_user)) != 0 ||
711: (r = sshpkt_put_cstring(ssh, authctxt->service)) != 0 ||
712: (r = sshpkt_put_cstring(ssh, authctxt->method->name)) != 0 ||
713: (r = sshpkt_put_u32(ssh, 1)) != 0 ||
714: (r = sshpkt_put_u32(ssh,
715: (gss_supported->elements[mech].length) + 2)) != 0 ||
716: (r = sshpkt_put_u8(ssh, SSH_GSS_OIDTYPE)) != 0 ||
717: (r = sshpkt_put_u8(ssh,
718: gss_supported->elements[mech].length)) != 0 ||
719: (r = sshpkt_put(ssh,
720: gss_supported->elements[mech].elements,
721: gss_supported->elements[mech].length)) != 0 ||
722: (r = sshpkt_send(ssh)) != 0)
723: fatal("%s: %s", __func__, ssh_err(r));
724:
725: ssh_dispatch_set(ssh, SSH2_MSG_USERAUTH_GSSAPI_RESPONSE, &input_gssapi_response);
726: ssh_dispatch_set(ssh, SSH2_MSG_USERAUTH_GSSAPI_TOKEN, &input_gssapi_token);
727: ssh_dispatch_set(ssh, SSH2_MSG_USERAUTH_GSSAPI_ERROR, &input_gssapi_error);
728: ssh_dispatch_set(ssh, SSH2_MSG_USERAUTH_GSSAPI_ERRTOK, &input_gssapi_errtok);
1.121 markus 729:
730: mech++; /* Move along to next candidate */
731:
732: return 1;
733: }
734:
1.130 markus 735: static OM_uint32
1.262 djm 736: process_gssapi_token(struct ssh *ssh, gss_buffer_t recv_tok)
1.130 markus 737: {
1.260 markus 738: Authctxt *authctxt = ssh->authctxt;
1.130 markus 739: Gssctxt *gssctxt = authctxt->methoddata;
740: gss_buffer_desc send_tok = GSS_C_EMPTY_BUFFER;
1.142 djm 741: gss_buffer_desc mic = GSS_C_EMPTY_BUFFER;
742: gss_buffer_desc gssbuf;
1.132 markus 743: OM_uint32 status, ms, flags;
1.278 markus 744: int r;
1.133 djm 745:
1.130 markus 746: status = ssh_gssapi_init_ctx(gssctxt, options.gss_deleg_creds,
1.132 markus 747: recv_tok, &send_tok, &flags);
1.130 markus 748:
749: if (send_tok.length > 0) {
1.278 markus 750: u_char type = GSS_ERROR(status) ?
751: SSH2_MSG_USERAUTH_GSSAPI_ERRTOK :
752: SSH2_MSG_USERAUTH_GSSAPI_TOKEN;
753:
754: if ((r = sshpkt_start(ssh, type)) != 0 ||
755: (r = sshpkt_put_string(ssh, send_tok.value,
756: send_tok.length)) != 0 ||
757: (r = sshpkt_send(ssh)) != 0)
758: fatal("%s: %s", __func__, ssh_err(r));
1.133 djm 759:
1.130 markus 760: gss_release_buffer(&ms, &send_tok);
761: }
1.133 djm 762:
1.130 markus 763: if (status == GSS_S_COMPLETE) {
1.132 markus 764: /* send either complete or MIC, depending on mechanism */
765: if (!(flags & GSS_C_INTEG_FLAG)) {
1.278 markus 766: if ((r = sshpkt_start(ssh,
767: SSH2_MSG_USERAUTH_GSSAPI_EXCHANGE_COMPLETE)) != 0 ||
768: (r = sshpkt_send(ssh)) != 0)
769: fatal("%s: %s", __func__, ssh_err(r));
1.132 markus 770: } else {
1.278 markus 771: struct sshbuf *b;
772:
773: if ((b = sshbuf_new()) == NULL)
774: fatal("%s: sshbuf_new failed", __func__);
775: ssh_gssapi_buildmic(b, authctxt->server_user,
1.132 markus 776: authctxt->service, "gssapi-with-mic");
777:
1.278 markus 778: if ((gssbuf.value = sshbuf_mutable_ptr(b)) == NULL)
779: fatal("%s: sshbuf_mutable_ptr failed", __func__);
780: gssbuf.length = sshbuf_len(b);
1.133 djm 781:
1.132 markus 782: status = ssh_gssapi_sign(gssctxt, &gssbuf, &mic);
1.133 djm 783:
1.132 markus 784: if (!GSS_ERROR(status)) {
1.278 markus 785: if ((r = sshpkt_start(ssh,
786: SSH2_MSG_USERAUTH_GSSAPI_MIC)) != 0 ||
787: (r = sshpkt_put_string(ssh, mic.value,
788: mic.length)) != 0 ||
789: (r = sshpkt_send(ssh)) != 0)
790: fatal("%s: %s", __func__, ssh_err(r));
1.132 markus 791: }
1.133 djm 792:
1.278 markus 793: sshbuf_free(b);
1.132 markus 794: gss_release_buffer(&ms, &mic);
1.133 djm 795: }
1.130 markus 796: }
1.133 djm 797:
1.130 markus 798: return status;
799: }
800:
1.169 djm 801: /* ARGSUSED */
1.220 djm 802: int
1.261 markus 803: input_gssapi_response(int type, u_int32_t plen, struct ssh *ssh)
1.121 markus 804: {
1.260 markus 805: Authctxt *authctxt = ssh->authctxt;
1.121 markus 806: Gssctxt *gssctxt;
1.278 markus 807: size_t oidlen;
808: u_char *oidv = NULL;
809: int r;
1.121 markus 810:
811: if (authctxt == NULL)
812: fatal("input_gssapi_response: no authentication context");
813: gssctxt = authctxt->methoddata;
814:
815: /* Setup our OID */
1.278 markus 816: if ((r = sshpkt_get_string(ssh, &oidv, &oidlen)) != 0)
817: goto done;
1.121 markus 818:
1.129 markus 819: if (oidlen <= 2 ||
820: oidv[0] != SSH_GSS_OIDTYPE ||
821: oidv[1] != oidlen - 2) {
822: debug("Badly encoded mechanism OID received");
823: userauth(authctxt, NULL);
1.278 markus 824: goto ok;
1.121 markus 825: }
1.129 markus 826:
827: if (!ssh_gssapi_check_oid(gssctxt, oidv + 2, oidlen - 2))
828: fatal("Server returned different OID than expected");
1.121 markus 829:
1.278 markus 830: if ((r = sshpkt_get_end(ssh)) != 0)
831: goto done;
1.121 markus 832:
1.262 djm 833: if (GSS_ERROR(process_gssapi_token(ssh, GSS_C_NO_BUFFER))) {
1.121 markus 834: /* Start again with next method on list */
835: debug("Trying to start again");
836: userauth(authctxt, NULL);
1.278 markus 837: goto ok;
1.121 markus 838: }
1.278 markus 839: ok:
840: r = 0;
841: done:
842: free(oidv);
843: return r;
1.121 markus 844: }
845:
1.169 djm 846: /* ARGSUSED */
1.220 djm 847: int
1.261 markus 848: input_gssapi_token(int type, u_int32_t plen, struct ssh *ssh)
1.121 markus 849: {
1.260 markus 850: Authctxt *authctxt = ssh->authctxt;
1.121 markus 851: gss_buffer_desc recv_tok;
1.278 markus 852: u_char *p = NULL;
853: size_t len;
1.130 markus 854: OM_uint32 status;
1.278 markus 855: int r;
1.121 markus 856:
857: if (authctxt == NULL)
858: fatal("input_gssapi_response: no authentication context");
859:
1.278 markus 860: if ((r = sshpkt_get_string(ssh, &p, &len)) != 0 ||
861: (r = sshpkt_get_end(ssh)) != 0)
862: goto out;
1.121 markus 863:
1.278 markus 864: recv_tok.value = p;
865: recv_tok.length = len;
1.262 djm 866: status = process_gssapi_token(ssh, &recv_tok);
1.121 markus 867:
1.278 markus 868: /* Start again with the next method in the list */
1.121 markus 869: if (GSS_ERROR(status)) {
870: userauth(authctxt, NULL);
1.278 markus 871: /* ok */
1.121 markus 872: }
1.278 markus 873: r = 0;
874: out:
875: free(p);
876: return r;
1.121 markus 877: }
878:
1.169 djm 879: /* ARGSUSED */
1.220 djm 880: int
1.261 markus 881: input_gssapi_errtok(int type, u_int32_t plen, struct ssh *ssh)
1.121 markus 882: {
1.260 markus 883: Authctxt *authctxt = ssh->authctxt;
1.121 markus 884: Gssctxt *gssctxt;
885: gss_buffer_desc send_tok = GSS_C_EMPTY_BUFFER;
886: gss_buffer_desc recv_tok;
1.194 djm 887: OM_uint32 ms;
1.278 markus 888: u_char *p = NULL;
889: size_t len;
890: int r;
1.121 markus 891:
892: if (authctxt == NULL)
893: fatal("input_gssapi_response: no authentication context");
894: gssctxt = authctxt->methoddata;
895:
1.278 markus 896: if ((r = sshpkt_get_string(ssh, &p, &len)) != 0 ||
897: (r = sshpkt_get_end(ssh)) != 0) {
898: free(p);
899: return r;
900: }
1.121 markus 901:
902: /* Stick it into GSSAPI and see what it says */
1.278 markus 903: recv_tok.value = p;
904: recv_tok.length = len;
1.194 djm 905: (void)ssh_gssapi_init_ctx(gssctxt, options.gss_deleg_creds,
1.140 djm 906: &recv_tok, &send_tok, NULL);
1.278 markus 907: free(p);
1.121 markus 908: gss_release_buffer(&ms, &send_tok);
909:
910: /* Server will be returning a failed packet after this one */
1.220 djm 911: return 0;
1.121 markus 912: }
913:
1.169 djm 914: /* ARGSUSED */
1.220 djm 915: int
1.261 markus 916: input_gssapi_error(int type, u_int32_t plen, struct ssh *ssh)
1.121 markus 917: {
1.278 markus 918: char *msg = NULL;
919: char *lang = NULL;
920: int r;
1.121 markus 921:
1.278 markus 922: if ((r = sshpkt_get_u32(ssh, NULL)) != 0 || /* maj */
923: (r = sshpkt_get_u32(ssh, NULL)) != 0 || /* min */
924: (r = sshpkt_get_cstring(ssh, &msg, NULL)) != 0 ||
925: (r = sshpkt_get_cstring(ssh, &lang, NULL)) != 0)
926: goto out;
927: r = sshpkt_get_end(ssh);
1.143 stevesk 928: debug("Server GSSAPI Error:\n%s", msg);
1.278 markus 929: out:
1.197 djm 930: free(msg);
931: free(lang);
1.278 markus 932: return r;
1.121 markus 933: }
934: #endif /* GSSAPI */
1.20 markus 935:
1.1 markus 936: int
1.23 markus 937: userauth_none(Authctxt *authctxt)
938: {
1.278 markus 939: struct ssh *ssh = active_state; /* XXX */
940: int r;
941:
1.23 markus 942: /* initial userauth request */
1.278 markus 943: if ((r = sshpkt_start(ssh, SSH2_MSG_USERAUTH_REQUEST)) != 0 ||
944: (r = sshpkt_put_cstring(ssh, authctxt->server_user)) != 0 ||
945: (r = sshpkt_put_cstring(ssh, authctxt->service)) != 0 ||
946: (r = sshpkt_put_cstring(ssh, authctxt->method->name)) != 0 ||
947: (r = sshpkt_send(ssh)) != 0)
948: fatal("%s: %s", __func__, ssh_err(r));
1.23 markus 949: return 1;
950: }
951:
952: int
1.20 markus 953: userauth_passwd(Authctxt *authctxt)
1.1 markus 954: {
1.278 markus 955: struct ssh *ssh = active_state; /* XXX */
1.290 djm 956: char *password, *prompt = NULL;
1.175 dtucker 957: const char *host = options.host_key_alias ? options.host_key_alias :
958: authctxt->host;
1.278 markus 959: int r;
1.6 markus 960:
1.292 djm 961: if (authctxt->attempt_passwd++ >= options.number_of_password_prompts)
1.6 markus 962: return 0;
1.13 todd 963:
1.292 djm 964: if (authctxt->attempt_passwd != 1)
1.13 todd 965: error("Permission denied, please try again.");
1.1 markus 966:
1.290 djm 967: xasprintf(&prompt, "%s@%s's password: ", authctxt->server_user, host);
1.1 markus 968: password = read_passphrase(prompt, 0);
1.278 markus 969: if ((r = sshpkt_start(ssh, SSH2_MSG_USERAUTH_REQUEST)) != 0 ||
970: (r = sshpkt_put_cstring(ssh, authctxt->server_user)) != 0 ||
971: (r = sshpkt_put_cstring(ssh, authctxt->service)) != 0 ||
972: (r = sshpkt_put_cstring(ssh, authctxt->method->name)) != 0 ||
973: (r = sshpkt_put_u8(ssh, 0)) != 0 ||
974: (r = sshpkt_put_cstring(ssh, password)) != 0 ||
975: (r = sshpkt_add_padding(ssh, 64)) != 0 ||
976: (r = sshpkt_send(ssh)) != 0)
977: fatal("%s: %s", __func__, ssh_err(r));
1.99 markus 978:
1.290 djm 979: free(prompt);
980: if (password != NULL)
1.278 markus 981: freezero(password, strlen(password));
982:
983: ssh_dispatch_set(ssh, SSH2_MSG_USERAUTH_PASSWD_CHANGEREQ,
1.99 markus 984: &input_userauth_passwd_changereq);
985:
1.1 markus 986: return 1;
987: }
1.169 djm 988:
1.99 markus 989: /*
990: * parse PASSWD_CHANGEREQ, prompt user and send SSH2_MSG_USERAUTH_REQUEST
991: */
1.169 djm 992: /* ARGSUSED */
1.218 markus 993: int
1.261 markus 994: input_userauth_passwd_changereq(int type, u_int32_t seqnr, struct ssh *ssh)
1.99 markus 995: {
1.260 markus 996: Authctxt *authctxt = ssh->authctxt;
1.278 markus 997: char *info = NULL, *lang = NULL, *password = NULL, *retype = NULL;
1.266 dtucker 998: char prompt[256];
1.252 djm 999: const char *host;
1.278 markus 1000: int r;
1.99 markus 1001:
1002: debug2("input_userauth_passwd_changereq");
1003:
1004: if (authctxt == NULL)
1005: fatal("input_userauth_passwd_changereq: "
1006: "no authentication context");
1.252 djm 1007: host = options.host_key_alias ? options.host_key_alias : authctxt->host;
1.99 markus 1008:
1.278 markus 1009: if ((r = sshpkt_get_cstring(ssh, &info, NULL)) != 0 ||
1010: (r = sshpkt_get_cstring(ssh, &lang, NULL)) != 0)
1011: goto out;
1.99 markus 1012: if (strlen(info) > 0)
1.116 itojun 1013: logit("%s", info);
1.278 markus 1014: if ((r = sshpkt_start(ssh, SSH2_MSG_USERAUTH_REQUEST)) != 0 ||
1015: (r = sshpkt_put_cstring(ssh, authctxt->server_user)) != 0 ||
1016: (r = sshpkt_put_cstring(ssh, authctxt->service)) != 0 ||
1017: (r = sshpkt_put_cstring(ssh, authctxt->method->name)) != 0 ||
1018: (r = sshpkt_put_u8(ssh, 1)) != 0) /* additional info */
1019: goto out;
1020:
1.104 deraadt 1021: snprintf(prompt, sizeof(prompt),
1.99 markus 1022: "Enter %.30s@%.128s's old password: ",
1.175 dtucker 1023: authctxt->server_user, host);
1.99 markus 1024: password = read_passphrase(prompt, 0);
1.278 markus 1025: if ((r = sshpkt_put_cstring(ssh, password)) != 0)
1026: goto out;
1027:
1028: freezero(password, strlen(password));
1.99 markus 1029: password = NULL;
1030: while (password == NULL) {
1.104 deraadt 1031: snprintf(prompt, sizeof(prompt),
1.99 markus 1032: "Enter %.30s@%.128s's new password: ",
1.175 dtucker 1033: authctxt->server_user, host);
1.99 markus 1034: password = read_passphrase(prompt, RP_ALLOW_EOF);
1035: if (password == NULL) {
1036: /* bail out */
1.278 markus 1037: r = 0;
1038: goto out;
1.99 markus 1039: }
1.104 deraadt 1040: snprintf(prompt, sizeof(prompt),
1.99 markus 1041: "Retype %.30s@%.128s's new password: ",
1.175 dtucker 1042: authctxt->server_user, host);
1.99 markus 1043: retype = read_passphrase(prompt, 0);
1044: if (strcmp(password, retype) != 0) {
1.278 markus 1045: freezero(password, strlen(password));
1.116 itojun 1046: logit("Mismatch; try again, EOF to quit.");
1.99 markus 1047: password = NULL;
1048: }
1.278 markus 1049: freezero(retype, strlen(retype));
1.99 markus 1050: }
1.278 markus 1051: if ((r = sshpkt_put_cstring(ssh, password)) != 0 ||
1052: (r = sshpkt_add_padding(ssh, 64)) != 0 ||
1053: (r = sshpkt_send(ssh)) != 0)
1054: goto out;
1.104 deraadt 1055:
1.278 markus 1056: ssh_dispatch_set(ssh, SSH2_MSG_USERAUTH_PASSWD_CHANGEREQ,
1.99 markus 1057: &input_userauth_passwd_changereq);
1.278 markus 1058: r = 0;
1059: out:
1060: if (password)
1061: freezero(password, strlen(password));
1062: free(info);
1063: free(lang);
1064: return r;
1.117 markus 1065: }
1066:
1.272 djm 1067: /*
1068: * Select an algorithm for publickey signatures.
1069: * Returns algorithm (caller must free) or NULL if no mutual algorithm found.
1070: *
1071: * Call with ssh==NULL to ignore server-sig-algs extension list and
1072: * only attempt with the key's base signature type.
1073: */
1074: static char *
1075: key_sig_algorithm(struct ssh *ssh, const struct sshkey *key)
1.231 markus 1076: {
1.274 djm 1077: char *allowed, *oallowed, *cp, *tmp, *alg = NULL;
1.231 markus 1078:
1.272 djm 1079: /*
1080: * The signature algorithm will only differ from the key algorithm
1081: * for RSA keys/certs and when the server advertises support for
1082: * newer (SHA2) algorithms.
1083: */
1084: if (ssh == NULL || ssh->kex->server_sig_algs == NULL ||
1.288 djm 1085: (key->type != KEY_RSA && key->type != KEY_RSA_CERT) ||
1086: (key->type == KEY_RSA_CERT && (datafellows & SSH_BUG_SIGTYPE))) {
1.272 djm 1087: /* Filter base key signature alg against our configuration */
1.279 markus 1088: return match_list(sshkey_ssh_name(key),
1.272 djm 1089: options.pubkey_key_types, NULL);
1.231 markus 1090: }
1091:
1.272 djm 1092: /*
1093: * For RSA keys/certs, since these might have a different sig type:
1094: * find the first entry in PubkeyAcceptedKeyTypes of the right type
1095: * that also appears in the supported signature algorithms list from
1096: * the server.
1097: */
1098: oallowed = allowed = xstrdup(options.pubkey_key_types);
1099: while ((cp = strsep(&allowed, ",")) != NULL) {
1100: if (sshkey_type_from_name(cp) != key->type)
1101: continue;
1.274 djm 1102: tmp = match_list(sshkey_sigalg_by_name(cp), ssh->kex->server_sig_algs, NULL);
1103: if (tmp != NULL)
1104: alg = xstrdup(cp);
1105: free(tmp);
1.272 djm 1106: if (alg != NULL)
1107: break;
1.269 djm 1108: }
1.272 djm 1109: free(oallowed);
1110: return alg;
1.269 djm 1111: }
1112:
1.117 markus 1113: static int
1.214 djm 1114: identity_sign(struct identity *id, u_char **sigp, size_t *lenp,
1.272 djm 1115: const u_char *data, size_t datalen, u_int compat, const char *alg)
1.117 markus 1116: {
1.259 markus 1117: struct sshkey *prv;
1.269 djm 1118: int r;
1.99 markus 1119:
1.272 djm 1120: /* The agent supports this key. */
1.269 djm 1121: if (id->key != NULL && id->agent_fd != -1) {
1.272 djm 1122: return ssh_agent_sign(id->agent_fd, id->key, sigp, lenp,
1123: data, datalen, alg, compat);
1.269 djm 1124: }
1.214 djm 1125:
1.117 markus 1126: /*
1.272 djm 1127: * We have already loaded the private key or the private key is
1128: * stored in external hardware.
1.117 markus 1129: */
1.255 djm 1130: if (id->key != NULL &&
1.272 djm 1131: (id->isprivate || (id->key->flags & SSHKEY_FLAG_EXT))) {
1132: if ((r = sshkey_sign(id->key, sigp, lenp, data, datalen,
1133: alg, compat)) != 0)
1134: return r;
1135: /*
1136: * PKCS#11 tokens may not support all signature algorithms,
1137: * so check what we get back.
1138: */
1139: if ((r = sshkey_check_sigtype(*sigp, *lenp, alg)) != 0)
1140: return r;
1141: return 0;
1142: }
1.255 djm 1143:
1.272 djm 1144: /* Load the private key from the file. */
1.229 jcs 1145: if ((prv = load_identity_file(id)) == NULL)
1.239 djm 1146: return SSH_ERR_KEY_NOT_FOUND;
1.265 djm 1147: if (id->key != NULL && !sshkey_equal_public(prv, id->key)) {
1148: error("%s: private key %s contents do not match public",
1149: __func__, id->filename);
1150: return SSH_ERR_KEY_NOT_FOUND;
1151: }
1.272 djm 1152: r = sshkey_sign(prv, sigp, lenp, data, datalen, alg, compat);
1.214 djm 1153: sshkey_free(prv);
1.269 djm 1154: return r;
1.51 markus 1155: }
1156:
1.76 itojun 1157: static int
1.255 djm 1158: id_filename_matches(Identity *id, Identity *private_id)
1159: {
1160: const char *suffixes[] = { ".pub", "-cert.pub", NULL };
1161: size_t len = strlen(id->filename), plen = strlen(private_id->filename);
1162: size_t i, slen;
1163:
1164: if (strcmp(id->filename, private_id->filename) == 0)
1165: return 1;
1166: for (i = 0; suffixes[i]; i++) {
1167: slen = strlen(suffixes[i]);
1168: if (len > slen && plen == len - slen &&
1169: strcmp(id->filename + (len - slen), suffixes[i]) == 0 &&
1170: memcmp(id->filename, private_id->filename, plen) == 0)
1171: return 1;
1172: }
1173: return 0;
1174: }
1175:
1176: static int
1.272 djm 1177: sign_and_send_pubkey(struct ssh *ssh, Authctxt *authctxt, Identity *id)
1.1 markus 1178: {
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
1.272 djm 1336: send_pubkey_test(struct ssh *ssh, Authctxt *authctxt, Identity *id)
1.20 markus 1337: {
1.272 djm 1338: u_char *blob = NULL;
1339: char *alg = NULL;
1.278 markus 1340: size_t bloblen;
1341: u_int have_sig = 0;
1342: int sent = 0, r;
1.20 markus 1343:
1.272 djm 1344: if ((alg = key_sig_algorithm(ssh, id->key)) == NULL) {
1345: debug("%s: no mutual signature algorithm", __func__);
1346: goto out;
1347: }
1.16 markus 1348:
1.278 markus 1349: if ((r = sshkey_to_blob(id->key, &blob, &bloblen)) != 0) {
1.51 markus 1350: /* we cannot handle this key */
1.272 djm 1351: debug3("%s: cannot handle key", __func__);
1352: goto out;
1.16 markus 1353: }
1.51 markus 1354: /* register callback for USERAUTH_PK_OK message */
1.278 markus 1355: ssh_dispatch_set(ssh, SSH2_MSG_USERAUTH_PK_OK, &input_userauth_pk_ok);
1.51 markus 1356:
1.278 markus 1357: if ((r = sshpkt_start(ssh, SSH2_MSG_USERAUTH_REQUEST)) != 0 ||
1358: (r = sshpkt_put_cstring(ssh, authctxt->server_user)) != 0 ||
1359: (r = sshpkt_put_cstring(ssh, authctxt->service)) != 0 ||
1360: (r = sshpkt_put_cstring(ssh, authctxt->method->name)) != 0 ||
1361: (r = sshpkt_put_u8(ssh, have_sig)) != 0 ||
1362: (r = sshpkt_put_cstring(ssh, alg)) != 0 ||
1363: (r = sshpkt_put_string(ssh, blob, bloblen)) != 0 ||
1364: (r = sshpkt_send(ssh)) != 0)
1365: fatal("%s: %s", __func__, ssh_err(r));
1.272 djm 1366: sent = 1;
1.278 markus 1367:
1368: out:
1.272 djm 1369: free(alg);
1.197 djm 1370: free(blob);
1.272 djm 1371: return sent;
1.51 markus 1372: }
1373:
1.259 markus 1374: static struct sshkey *
1.229 jcs 1375: load_identity_file(Identity *id)
1.51 markus 1376: {
1.259 markus 1377: struct sshkey *private = NULL;
1.229 jcs 1378: char prompt[300], *passphrase, *comment;
1.215 djm 1379: int r, perm_ok = 0, quit = 0, i;
1.52 markus 1380: struct stat st;
1.16 markus 1381:
1.229 jcs 1382: if (stat(id->filename, &st) < 0) {
1383: (id->userprovided ? logit : debug3)("no such identity: %s: %s",
1384: id->filename, strerror(errno));
1.52 markus 1385: return NULL;
1386: }
1.214 djm 1387: snprintf(prompt, sizeof prompt,
1.229 jcs 1388: "Enter passphrase for key '%.100s': ", id->filename);
1.214 djm 1389: for (i = 0; i <= options.number_of_password_prompts; i++) {
1390: if (i == 0)
1391: passphrase = "";
1392: else {
1.20 markus 1393: passphrase = read_passphrase(prompt, 0);
1.214 djm 1394: if (*passphrase == '\0') {
1.20 markus 1395: debug2("no passphrase given, try next key");
1.214 djm 1396: free(passphrase);
1397: break;
1398: }
1399: }
1.229 jcs 1400: switch ((r = sshkey_load_private_type(KEY_UNSPEC, id->filename,
1401: passphrase, &private, &comment, &perm_ok))) {
1.214 djm 1402: case 0:
1403: break;
1404: case SSH_ERR_KEY_WRONG_PASSPHRASE:
1405: if (options.batch_mode) {
1406: quit = 1;
1407: break;
1408: }
1.215 djm 1409: if (i != 0)
1410: debug2("bad passphrase given, try again...");
1.214 djm 1411: break;
1412: case SSH_ERR_SYSTEM_ERROR:
1413: if (errno == ENOENT) {
1414: debug2("Load key \"%s\": %s",
1.229 jcs 1415: id->filename, ssh_err(r));
1.51 markus 1416: quit = 1;
1.214 djm 1417: break;
1.20 markus 1418: }
1.214 djm 1419: /* FALLTHROUGH */
1420: default:
1.229 jcs 1421: error("Load key \"%s\": %s", id->filename, ssh_err(r));
1.214 djm 1422: quit = 1;
1423: break;
1424: }
1.230 djm 1425: if (!quit && private != NULL && id->agent_fd == -1 &&
1.229 jcs 1426: !(id->key && id->isprivate))
1427: maybe_add_key_to_agent(id->filename, private, comment,
1428: passphrase);
1.278 markus 1429: if (i > 0)
1430: freezero(passphrase, strlen(passphrase));
1.232 mmcc 1431: free(comment);
1.214 djm 1432: if (private != NULL || quit)
1433: break;
1.16 markus 1434: }
1.51 markus 1435: return private;
1436: }
1437:
1.272 djm 1438: static int
1439: key_type_allowed_by_config(struct sshkey *key)
1440: {
1441: if (match_pattern_list(sshkey_ssh_name(key),
1442: options.pubkey_key_types, 0) == 1)
1443: return 1;
1444:
1445: /* RSA keys/certs might be allowed by alternate signature types */
1446: switch (key->type) {
1447: case KEY_RSA:
1448: if (match_pattern_list("rsa-sha2-512",
1449: options.pubkey_key_types, 0) == 1)
1450: return 1;
1451: if (match_pattern_list("rsa-sha2-256",
1452: options.pubkey_key_types, 0) == 1)
1453: return 1;
1454: break;
1455: case KEY_RSA_CERT:
1456: if (match_pattern_list("rsa-sha2-512-cert-v01@openssh.com",
1457: options.pubkey_key_types, 0) == 1)
1458: return 1;
1459: if (match_pattern_list("rsa-sha2-256-cert-v01@openssh.com",
1460: options.pubkey_key_types, 0) == 1)
1461: return 1;
1462: break;
1463: }
1464: return 0;
1465: }
1466:
1467:
1.117 markus 1468: /*
1469: * try keys in the following order:
1.227 djm 1470: * 1. certificates listed in the config file
1471: * 2. other input certificates
1472: * 3. agent keys that are found in the config file
1473: * 4. other agent keys
1474: * 5. keys that are only listed in the config file
1.117 markus 1475: */
1476: static void
1477: pubkey_prepare(Authctxt *authctxt)
1.51 markus 1478: {
1.214 djm 1479: struct identity *id, *id2, *tmp;
1480: struct idlist agent, files, *preferred;
1481: struct sshkey *key;
1.230 djm 1482: int agent_fd = -1, i, r, found;
1.214 djm 1483: size_t j;
1484: struct ssh_identitylist *idlist;
1.287 djm 1485: char *ident;
1.51 markus 1486:
1.117 markus 1487: TAILQ_INIT(&agent); /* keys from the agent */
1488: TAILQ_INIT(&files); /* keys from the config file */
1489: preferred = &authctxt->keys;
1490: TAILQ_INIT(preferred); /* preferred order of keys */
1491:
1.190 djm 1492: /* list of keys stored in the filesystem and PKCS#11 */
1.117 markus 1493: for (i = 0; i < options.num_identity_files; i++) {
1494: key = options.identity_keys[i];
1.180 djm 1495: if (key && key->cert && key->cert->type != SSH2_CERT_TYPE_USER)
1.117 markus 1496: continue;
1497: options.identity_keys[i] = NULL;
1.150 djm 1498: id = xcalloc(1, sizeof(*id));
1.230 djm 1499: id->agent_fd = -1;
1.117 markus 1500: id->key = key;
1501: id->filename = xstrdup(options.identity_files[i]);
1.192 dtucker 1502: id->userprovided = options.identity_file_userprovided[i];
1.117 markus 1503: TAILQ_INSERT_TAIL(&files, id, next);
1.190 djm 1504: }
1.227 djm 1505: /* list of certificates specified by user */
1506: for (i = 0; i < options.num_certificate_files; i++) {
1507: key = options.certificates[i];
1.278 markus 1508: if (!sshkey_is_cert(key) || key->cert == NULL ||
1.227 djm 1509: key->cert->type != SSH2_CERT_TYPE_USER)
1510: continue;
1511: id = xcalloc(1, sizeof(*id));
1.230 djm 1512: id->agent_fd = -1;
1.227 djm 1513: id->key = key;
1514: id->filename = xstrdup(options.certificate_files[i]);
1515: id->userprovided = options.certificate_file_userprovided[i];
1516: TAILQ_INSERT_TAIL(preferred, id, next);
1.117 markus 1517: }
1518: /* list of keys supported by the agent */
1.214 djm 1519: if ((r = ssh_get_authentication_socket(&agent_fd)) != 0) {
1520: if (r != SSH_ERR_AGENT_NOT_PRESENT)
1521: debug("%s: ssh_get_authentication_socket: %s",
1522: __func__, ssh_err(r));
1.258 naddy 1523: } else if ((r = ssh_fetch_identitylist(agent_fd, &idlist)) != 0) {
1.214 djm 1524: if (r != SSH_ERR_AGENT_NO_IDENTITIES)
1525: debug("%s: ssh_fetch_identitylist: %s",
1526: __func__, ssh_err(r));
1.237 markus 1527: close(agent_fd);
1.214 djm 1528: } else {
1529: for (j = 0; j < idlist->nkeys; j++) {
1.117 markus 1530: found = 0;
1531: TAILQ_FOREACH(id, &files, next) {
1.214 djm 1532: /*
1533: * agent keys from the config file are
1534: * preferred
1535: */
1536: if (sshkey_equal(idlist->keys[j], id->key)) {
1.117 markus 1537: TAILQ_REMOVE(&files, id, next);
1538: TAILQ_INSERT_TAIL(preferred, id, next);
1.214 djm 1539: id->agent_fd = agent_fd;
1.117 markus 1540: found = 1;
1541: break;
1542: }
1543: }
1.135 markus 1544: if (!found && !options.identities_only) {
1.150 djm 1545: id = xcalloc(1, sizeof(*id));
1.214 djm 1546: /* XXX "steals" key/comment from idlist */
1547: id->key = idlist->keys[j];
1548: id->filename = idlist->comments[j];
1549: idlist->keys[j] = NULL;
1550: idlist->comments[j] = NULL;
1551: id->agent_fd = agent_fd;
1.117 markus 1552: TAILQ_INSERT_TAIL(&agent, id, next);
1553: }
1554: }
1.214 djm 1555: ssh_free_identitylist(idlist);
1.117 markus 1556: /* append remaining agent keys */
1557: for (id = TAILQ_FIRST(&agent); id; id = TAILQ_FIRST(&agent)) {
1558: TAILQ_REMOVE(&agent, id, next);
1559: TAILQ_INSERT_TAIL(preferred, id, next);
1560: }
1.214 djm 1561: authctxt->agent_fd = agent_fd;
1.244 djm 1562: }
1563: /* Prefer PKCS11 keys that are explicitly listed */
1564: TAILQ_FOREACH_SAFE(id, &files, next, tmp) {
1565: if (id->key == NULL || (id->key->flags & SSHKEY_FLAG_EXT) == 0)
1566: continue;
1567: found = 0;
1568: TAILQ_FOREACH(id2, &files, next) {
1569: if (id2->key == NULL ||
1570: (id2->key->flags & SSHKEY_FLAG_EXT) == 0)
1571: continue;
1572: if (sshkey_equal(id->key, id2->key)) {
1573: TAILQ_REMOVE(&files, id, next);
1574: TAILQ_INSERT_TAIL(preferred, id, next);
1575: found = 1;
1576: break;
1577: }
1578: }
1579: /* If IdentitiesOnly set and key not found then don't use it */
1580: if (!found && options.identities_only) {
1581: TAILQ_REMOVE(&files, id, next);
1.278 markus 1582: freezero(id, sizeof(*id));
1.244 djm 1583: }
1.117 markus 1584: }
1585: /* append remaining keys from the config file */
1586: for (id = TAILQ_FIRST(&files); id; id = TAILQ_FIRST(&files)) {
1587: TAILQ_REMOVE(&files, id, next);
1588: TAILQ_INSERT_TAIL(preferred, id, next);
1589: }
1.228 djm 1590: /* finally, filter by PubkeyAcceptedKeyTypes */
1591: TAILQ_FOREACH_SAFE(id, preferred, next, id2) {
1.273 djm 1592: if (id->key != NULL && !key_type_allowed_by_config(id->key)) {
1.228 djm 1593: debug("Skipping %s key %s - "
1594: "not in PubkeyAcceptedKeyTypes",
1595: sshkey_ssh_name(id->key), id->filename);
1596: TAILQ_REMOVE(preferred, id, next);
1597: sshkey_free(id->key);
1598: free(id->filename);
1599: memset(id, 0, sizeof(*id));
1600: continue;
1601: }
1.117 markus 1602: }
1.287 djm 1603: /* List the keys we plan on using */
1604: TAILQ_FOREACH_SAFE(id, preferred, next, id2) {
1605: ident = format_identity(id);
1606: debug("Will attempt key: %s", ident);
1607: free(ident);
1608: }
1609: debug2("%s: done", __func__);
1.17 markus 1610: }
1611:
1.117 markus 1612: static void
1613: pubkey_cleanup(Authctxt *authctxt)
1.51 markus 1614: {
1.117 markus 1615: Identity *id;
1.51 markus 1616:
1.289 djm 1617: if (authctxt->agent_fd != -1) {
1.214 djm 1618: ssh_close_authentication_socket(authctxt->agent_fd);
1.289 djm 1619: authctxt->agent_fd = -1;
1620: }
1.117 markus 1621: for (id = TAILQ_FIRST(&authctxt->keys); id;
1622: id = TAILQ_FIRST(&authctxt->keys)) {
1623: TAILQ_REMOVE(&authctxt->keys, id, next);
1.235 mmcc 1624: sshkey_free(id->key);
1.197 djm 1625: free(id->filename);
1626: free(id);
1.117 markus 1627: }
1.1 markus 1628: }
1629:
1.251 djm 1630: static void
1631: pubkey_reset(Authctxt *authctxt)
1632: {
1633: Identity *id;
1634:
1635: TAILQ_FOREACH(id, &authctxt->keys, next)
1636: id->tried = 0;
1637: }
1638:
1.225 markus 1639: static int
1640: try_identity(Identity *id)
1641: {
1642: if (!id->key)
1643: return (0);
1.279 markus 1644: if (sshkey_type_plain(id->key->type) == KEY_RSA &&
1.225 markus 1645: (datafellows & SSH_BUG_RSASIGMD5) != 0) {
1646: debug("Skipped %s key %s for RSA/MD5 server",
1.279 markus 1647: sshkey_type(id->key), id->filename);
1.225 markus 1648: return (0);
1649: }
1.257 djm 1650: return 1;
1.225 markus 1651: }
1652:
1.20 markus 1653: int
1654: userauth_pubkey(Authctxt *authctxt)
1655: {
1.272 djm 1656: struct ssh *ssh = active_state; /* XXX */
1.117 markus 1657: Identity *id;
1.20 markus 1658: int sent = 0;
1.287 djm 1659: char *ident;
1.20 markus 1660:
1.117 markus 1661: while ((id = TAILQ_FIRST(&authctxt->keys))) {
1662: if (id->tried++)
1663: return (0);
1.127 markus 1664: /* move key to the end of the queue */
1.117 markus 1665: TAILQ_REMOVE(&authctxt->keys, id, next);
1666: TAILQ_INSERT_TAIL(&authctxt->keys, id, next);
1667: /*
1668: * send a test message if we have the public key. for
1669: * encrypted keys we cannot do this and have to load the
1670: * private key instead
1671: */
1.200 djm 1672: if (id->key != NULL) {
1.225 markus 1673: if (try_identity(id)) {
1.287 djm 1674: ident = format_identity(id);
1675: debug("Offering public key: %s", ident);
1676: free(ident);
1.272 djm 1677: sent = send_pubkey_test(ssh, authctxt, id);
1.200 djm 1678: }
1679: } else {
1.117 markus 1680: debug("Trying private key: %s", id->filename);
1.229 jcs 1681: id->key = load_identity_file(id);
1.117 markus 1682: if (id->key != NULL) {
1.225 markus 1683: if (try_identity(id)) {
1684: id->isprivate = 1;
1.272 djm 1685: sent = sign_and_send_pubkey(ssh,
1.200 djm 1686: authctxt, id);
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
1703: userauth_kbdint(Authctxt *authctxt)
1704: {
1.278 markus 1705: struct ssh *ssh = active_state; /* XXX */
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
1.223 djm 1801: ssh_keysign(struct sshkey *key, u_char **sigp, size_t *lenp,
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;
1.223 djm 1807: int i, r, to[2], from[2], status, sock = packet_get_connection_in();
1808: u_char rversion = 0, version = 2;
1809: void (*osigchld)(int);
1.100 markus 1810:
1.223 djm 1811: *sigp = NULL;
1812: *lenp = 0;
1.100 markus 1813:
1.101 markus 1814: if (stat(_PATH_SSH_KEY_SIGN, &st) < 0) {
1.223 djm 1815: error("%s: not installed: %s", __func__, strerror(errno));
1816: return -1;
1817: }
1818: if (fflush(stdout) != 0) {
1819: error("%s: fflush: %s", __func__, strerror(errno));
1.101 markus 1820: return -1;
1821: }
1.100 markus 1822: if (pipe(to) < 0) {
1.223 djm 1823: error("%s: pipe: %s", __func__, strerror(errno));
1.100 markus 1824: return -1;
1825: }
1826: if (pipe(from) < 0) {
1.223 djm 1827: error("%s: pipe: %s", __func__, strerror(errno));
1.100 markus 1828: return -1;
1829: }
1830: if ((pid = fork()) < 0) {
1.223 djm 1831: error("%s: fork: %s", __func__, strerror(errno));
1.100 markus 1832: return -1;
1833: }
1.223 djm 1834: osigchld = signal(SIGCHLD, SIG_DFL);
1.100 markus 1835: if (pid == 0) {
1.174 dtucker 1836: /* keep the socket on exec */
1.223 djm 1837: fcntl(sock, F_SETFD, 0);
1.100 markus 1838: close(from[0]);
1839: if (dup2(from[1], STDOUT_FILENO) < 0)
1.223 djm 1840: fatal("%s: dup2: %s", __func__, strerror(errno));
1.100 markus 1841: close(to[1]);
1842: if (dup2(to[0], STDIN_FILENO) < 0)
1.223 djm 1843: fatal("%s: dup2: %s", __func__, strerror(errno));
1.103 markus 1844: close(from[1]);
1845: close(to[0]);
1.223 djm 1846: /* Close everything but stdio and the socket */
1847: for (i = STDERR_FILENO + 1; i < sock; i++)
1848: close(i);
1849: closefrom(sock + 1);
1850: debug3("%s: [child] pid=%ld, exec %s",
1851: __func__, (long)getpid(), _PATH_SSH_KEY_SIGN);
1.233 mmcc 1852: execl(_PATH_SSH_KEY_SIGN, _PATH_SSH_KEY_SIGN, (char *)NULL);
1.223 djm 1853: fatal("%s: exec(%s): %s", __func__, _PATH_SSH_KEY_SIGN,
1.100 markus 1854: strerror(errno));
1855: }
1856: close(from[1]);
1857: close(to[0]);
1858:
1.223 djm 1859: if ((b = sshbuf_new()) == NULL)
1860: fatal("%s: sshbuf_new failed", __func__);
1861: /* send # of sock, data to be signed */
1.253 djm 1862: if ((r = sshbuf_put_u32(b, sock)) != 0 ||
1.223 djm 1863: (r = sshbuf_put_string(b, data, datalen)) != 0)
1864: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1865: if (ssh_msg_send(to[1], version, b) == -1)
1866: fatal("%s: couldn't send request", __func__);
1867: sshbuf_reset(b);
1868: r = ssh_msg_recv(from[0], b);
1.101 markus 1869: close(from[0]);
1870: close(to[1]);
1.223 djm 1871: if (r < 0) {
1872: error("%s: no reply", __func__);
1873: goto fail;
1874: }
1.101 markus 1875:
1.223 djm 1876: errno = 0;
1877: while (waitpid(pid, &status, 0) < 0) {
1878: if (errno != EINTR) {
1879: error("%s: waitpid %ld: %s",
1880: __func__, (long)pid, strerror(errno));
1881: goto fail;
1882: }
1883: }
1884: if (!WIFEXITED(status)) {
1885: error("%s: exited abnormally", __func__);
1886: goto fail;
1887: }
1888: if (WEXITSTATUS(status) != 0) {
1889: error("%s: exited with status %d",
1890: __func__, WEXITSTATUS(status));
1891: goto fail;
1892: }
1893: if ((r = sshbuf_get_u8(b, &rversion)) != 0) {
1894: error("%s: buffer error: %s", __func__, ssh_err(r));
1895: goto fail;
1896: }
1897: if (rversion != version) {
1898: error("%s: bad version", __func__);
1899: goto fail;
1900: }
1901: if ((r = sshbuf_get_string(b, sigp, lenp)) != 0) {
1902: error("%s: buffer error: %s", __func__, ssh_err(r));
1903: fail:
1904: signal(SIGCHLD, osigchld);
1905: sshbuf_free(b);
1.100 markus 1906: return -1;
1907: }
1.223 djm 1908: signal(SIGCHLD, osigchld);
1909: sshbuf_free(b);
1.100 markus 1910:
1911: return 0;
1912: }
1913:
1.68 markus 1914: int
1915: userauth_hostbased(Authctxt *authctxt)
1916: {
1.272 djm 1917: struct ssh *ssh = active_state; /* XXX */
1.223 djm 1918: struct sshkey *private = NULL;
1919: struct sshbuf *b = NULL;
1920: u_char *sig = NULL, *keyblob = NULL;
1921: char *fp = NULL, *chost = NULL, *lname = NULL;
1922: size_t siglen = 0, keylen = 0;
1923: int i, r, success = 0;
1924:
1925: if (authctxt->ktypes == NULL) {
1926: authctxt->oktypes = xstrdup(options.hostbased_key_types);
1927: authctxt->ktypes = authctxt->oktypes;
1928: }
1.213 djm 1929:
1.223 djm 1930: /*
1931: * Work through each listed type pattern in HostbasedKeyTypes,
1932: * trying each hostkey that matches the type in turn.
1933: */
1934: for (;;) {
1935: if (authctxt->active_ktype == NULL)
1936: authctxt->active_ktype = strsep(&authctxt->ktypes, ",");
1937: if (authctxt->active_ktype == NULL ||
1938: *authctxt->active_ktype == '\0')
1939: break;
1940: debug3("%s: trying key type %s", __func__,
1941: authctxt->active_ktype);
1.68 markus 1942:
1.223 djm 1943: /* check for a useful key */
1944: private = NULL;
1945: for (i = 0; i < authctxt->sensitive->nkeys; i++) {
1946: if (authctxt->sensitive->keys[i] == NULL ||
1947: authctxt->sensitive->keys[i]->type == KEY_UNSPEC)
1948: continue;
1949: if (match_pattern_list(
1950: sshkey_ssh_name(authctxt->sensitive->keys[i]),
1.224 djm 1951: authctxt->active_ktype, 0) != 1)
1.223 djm 1952: continue;
1.68 markus 1953: /* we take and free the key */
1.223 djm 1954: private = authctxt->sensitive->keys[i];
1955: authctxt->sensitive->keys[i] = NULL;
1.68 markus 1956: break;
1957: }
1.223 djm 1958: /* Found one */
1959: if (private != NULL)
1960: break;
1961: /* No more keys of this type; advance */
1962: authctxt->active_ktype = NULL;
1.68 markus 1963: }
1.223 djm 1964: if (private == NULL) {
1965: free(authctxt->oktypes);
1966: authctxt->oktypes = authctxt->ktypes = NULL;
1967: authctxt->active_ktype = NULL;
1.109 markus 1968: debug("No more client hostkeys for hostbased authentication.");
1.223 djm 1969: goto out;
1.68 markus 1970: }
1.211 djm 1971:
1.223 djm 1972: if ((fp = sshkey_fingerprint(private, options.fingerprint_hash,
1973: SSH_FP_DEFAULT)) == NULL) {
1974: error("%s: sshkey_fingerprint failed", __func__);
1975: goto out;
1.68 markus 1976: }
1.223 djm 1977: debug("%s: trying hostkey %s %s",
1978: __func__, sshkey_ssh_name(private), fp);
1.211 djm 1979:
1.84 markus 1980: /* figure out a name for the client host */
1.223 djm 1981: if ((lname = get_local_name(packet_get_connection_in())) == NULL) {
1982: error("%s: cannot get local ipaddr/name", __func__);
1983: goto out;
1.84 markus 1984: }
1.223 djm 1985:
1986: /* XXX sshbuf_put_stringf? */
1987: xasprintf(&chost, "%s.", lname);
1988: debug2("%s: chost %s", __func__, chost);
1.84 markus 1989:
1.68 markus 1990: /* construct data */
1.223 djm 1991: if ((b = sshbuf_new()) == NULL) {
1992: error("%s: sshbuf_new failed", __func__);
1993: goto out;
1994: }
1995: if ((r = sshkey_to_blob(private, &keyblob, &keylen)) != 0) {
1996: error("%s: sshkey_to_blob: %s", __func__, ssh_err(r));
1997: goto out;
1998: }
1999: if ((r = sshbuf_put_string(b, session_id2, session_id2_len)) != 0 ||
2000: (r = sshbuf_put_u8(b, SSH2_MSG_USERAUTH_REQUEST)) != 0 ||
2001: (r = sshbuf_put_cstring(b, authctxt->server_user)) != 0 ||
1.267 djm 2002: (r = sshbuf_put_cstring(b, authctxt->service)) != 0 ||
1.223 djm 2003: (r = sshbuf_put_cstring(b, authctxt->method->name)) != 0 ||
1.279 markus 2004: (r = sshbuf_put_cstring(b, sshkey_ssh_name(private))) != 0 ||
1.223 djm 2005: (r = sshbuf_put_string(b, keyblob, keylen)) != 0 ||
2006: (r = sshbuf_put_cstring(b, chost)) != 0 ||
2007: (r = sshbuf_put_cstring(b, authctxt->local_user)) != 0) {
2008: error("%s: buffer error: %s", __func__, ssh_err(r));
2009: goto out;
2010: }
2011:
1.68 markus 2012: #ifdef DEBUG_PK
1.223 djm 2013: sshbuf_dump(b, stderr);
1.68 markus 2014: #endif
1.281 dtucker 2015: r = ssh_keysign(private, &sig, &siglen,
2016: sshbuf_ptr(b), sshbuf_len(b));
1.223 djm 2017: if (r != 0) {
2018: error("sign using hostkey %s %s failed",
2019: sshkey_ssh_name(private), fp);
2020: goto out;
2021: }
2022: if ((r = sshpkt_start(ssh, SSH2_MSG_USERAUTH_REQUEST)) != 0 ||
2023: (r = sshpkt_put_cstring(ssh, authctxt->server_user)) != 0 ||
2024: (r = sshpkt_put_cstring(ssh, authctxt->service)) != 0 ||
2025: (r = sshpkt_put_cstring(ssh, authctxt->method->name)) != 0 ||
1.279 markus 2026: (r = sshpkt_put_cstring(ssh, sshkey_ssh_name(private))) != 0 ||
1.223 djm 2027: (r = sshpkt_put_string(ssh, keyblob, keylen)) != 0 ||
2028: (r = sshpkt_put_cstring(ssh, chost)) != 0 ||
2029: (r = sshpkt_put_cstring(ssh, authctxt->local_user)) != 0 ||
2030: (r = sshpkt_put_string(ssh, sig, siglen)) != 0 ||
2031: (r = sshpkt_send(ssh)) != 0) {
2032: error("%s: packet error: %s", __func__, ssh_err(r));
2033: goto out;
2034: }
2035: success = 1;
2036:
2037: out:
1.278 markus 2038: if (sig != NULL)
2039: freezero(sig, siglen);
1.223 djm 2040: free(keyblob);
2041: free(lname);
2042: free(fp);
1.197 djm 2043: free(chost);
1.223 djm 2044: sshkey_free(private);
2045: sshbuf_free(b);
1.68 markus 2046:
1.223 djm 2047: return success;
1.23 markus 2048: }
1.170 djm 2049:
1.20 markus 2050: /* find auth method */
2051:
2052: /*
2053: * given auth method name, if configurable options permit this method fill
2054: * in auth_ident field and return true, otherwise return false.
2055: */
1.76 itojun 2056: static int
1.20 markus 2057: authmethod_is_enabled(Authmethod *method)
2058: {
2059: if (method == NULL)
2060: return 0;
2061: /* return false if options indicate this method is disabled */
2062: if (method->enabled == NULL || *method->enabled == 0)
2063: return 0;
2064: /* return false if batch mode is enabled but method needs interactive mode */
2065: if (method->batch_flag != NULL && *method->batch_flag != 0)
2066: return 0;
2067: return 1;
2068: }
2069:
1.76 itojun 2070: static Authmethod *
1.20 markus 2071: authmethod_lookup(const char *name)
1.1 markus 2072: {
1.20 markus 2073: Authmethod *method = NULL;
2074: if (name != NULL)
2075: for (method = authmethods; method->name != NULL; method++)
2076: if (strcmp(name, method->name) == 0)
2077: return method;
2078: debug2("Unrecognized authentication method name: %s", name ? name : "NULL");
2079: return NULL;
2080: }
1.1 markus 2081:
1.53 markus 2082: /* XXX internal state */
2083: static Authmethod *current = NULL;
2084: static char *supported = NULL;
2085: static char *preferred = NULL;
1.105 deraadt 2086:
1.20 markus 2087: /*
2088: * Given the authentication method list sent by the server, return the
2089: * next method we should try. If the server initially sends a nil list,
1.67 markus 2090: * use a built-in default list.
1.41 stevesk 2091: */
1.76 itojun 2092: static Authmethod *
1.20 markus 2093: authmethod_get(char *authlist)
2094: {
1.53 markus 2095: char *name = NULL;
1.97 markus 2096: u_int next;
1.41 stevesk 2097:
1.20 markus 2098: /* Use a suitable default if we're passed a nil list. */
2099: if (authlist == NULL || strlen(authlist) == 0)
1.53 markus 2100: authlist = options.preferred_authentications;
1.20 markus 2101:
1.53 markus 2102: if (supported == NULL || strcmp(authlist, supported) != 0) {
2103: debug3("start over, passed a different list %s", authlist);
1.197 djm 2104: free(supported);
1.53 markus 2105: supported = xstrdup(authlist);
2106: preferred = options.preferred_authentications;
2107: debug3("preferred %s", preferred);
2108: current = NULL;
2109: } else if (current != NULL && authmethod_is_enabled(current))
2110: return current;
1.20 markus 2111:
1.53 markus 2112: for (;;) {
2113: if ((name = match_list(preferred, supported, &next)) == NULL) {
1.109 markus 2114: debug("No more authentication methods to try.");
1.53 markus 2115: current = NULL;
2116: return NULL;
2117: }
2118: preferred += next;
1.23 markus 2119: debug3("authmethod_lookup %s", name);
1.53 markus 2120: debug3("remaining preferred: %s", preferred);
2121: if ((current = authmethod_lookup(name)) != NULL &&
2122: authmethod_is_enabled(current)) {
1.23 markus 2123: debug3("authmethod_is_enabled %s", name);
1.109 markus 2124: debug("Next authentication method: %s", name);
1.197 djm 2125: free(name);
1.53 markus 2126: return current;
1.23 markus 2127: }
1.198 dtucker 2128: free(name);
1.1 markus 2129: }
1.53 markus 2130: }
1.1 markus 2131:
1.79 stevesk 2132: static char *
1.53 markus 2133: authmethods_get(void)
2134: {
2135: Authmethod *method = NULL;
1.278 markus 2136: struct sshbuf *b;
1.93 markus 2137: char *list;
1.278 markus 2138: int r;
1.27 provos 2139:
1.278 markus 2140: if ((b = sshbuf_new()) == NULL)
2141: fatal("%s: sshbuf_new failed", __func__);
1.53 markus 2142: for (method = authmethods; method->name != NULL; method++) {
2143: if (authmethod_is_enabled(method)) {
1.278 markus 2144: if ((r = sshbuf_putf(b, "%s%s",
2145: sshbuf_len(b) ? "," : "", method->name)) != 0)
2146: fatal("%s: buffer error: %s",
2147: __func__, ssh_err(r));
1.53 markus 2148: }
2149: }
1.278 markus 2150: if ((list = sshbuf_dup_string(b)) == NULL)
1.242 djm 2151: fatal("%s: sshbuf_dup_string failed", __func__);
1.278 markus 2152: sshbuf_free(b);
1.93 markus 2153: return list;
1.1 markus 2154: }
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